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2008 Vol. 38, No. 9
Display Method:
2008, 38(9): 1-3.
doi: 10.13204/j.gyjz200809001
Abstract:
Taking No.2 and No.3 factories of TFTM Co.,Ltd.for example,it is presented the use of Toyota thought of keeping on improving in architectural design of a factory building
Taking No.2 and No.3 factories of TFTM Co.,Ltd.for example,it is presented the use of Toyota thought of keeping on improving in architectural design of a factory building
2008, 38(9): 4-6.
doi: 10.13204/j.gyjz200809002
Abstract:
It is summarized the selection of foundation type,treatment of subsoil and foundation settlement: calculation and requirement for settlement control,and it is also presented suggestions on using correctly geology survey report based on the design practice on subsoil and foundation.
It is summarized the selection of foundation type,treatment of subsoil and foundation settlement: calculation and requirement for settlement control,and it is also presented suggestions on using correctly geology survey report based on the design practice on subsoil and foundation.
2008, 38(9): 7-9,50.
doi: 10.13204/j.gyjz200809003
Abstract:
It is outlined the mechanism and effect of reinforcing the subsoil made of garbage by vibroflotation,whose composition is complicated and layer is thick,based on actual projects of building heavy-duty casting plant in the garbage site. To validate the design assumption,it is also carried out loading test of single pile composite foundation with heavy-duty dynamic penetration test.Based on the analysis of the test results,the effect of reinforcing is finally judged.
It is outlined the mechanism and effect of reinforcing the subsoil made of garbage by vibroflotation,whose composition is complicated and layer is thick,based on actual projects of building heavy-duty casting plant in the garbage site. To validate the design assumption,it is also carried out loading test of single pile composite foundation with heavy-duty dynamic penetration test.Based on the analysis of the test results,the effect of reinforcing is finally judged.
2008, 38(9): 10-12.
doi: 10.13204/j.gyjz200809004
Abstract:
It is introduced the constructing of stamping equipment ribbon trench that is inside a completed factory building and close to its foundation since area confined.On the condition that the maximum depth of stamping equipment ribbon trench is 4.5 m deeper than the workshop foundation,the method of bored piles with prestressed anchors is adopted to ensure the stability of the existing building;and the relevant data on basic testing and acceptance testing of prestressed anchors are also given.
It is introduced the constructing of stamping equipment ribbon trench that is inside a completed factory building and close to its foundation since area confined.On the condition that the maximum depth of stamping equipment ribbon trench is 4.5 m deeper than the workshop foundation,the method of bored piles with prestressed anchors is adopted to ensure the stability of the existing building;and the relevant data on basic testing and acceptance testing of prestressed anchors are also given.
2008, 38(9): 13-15,73.
doi: 10.13204/j.gyjz200809005
Abstract:
It is described the design method for steel column of space grid structure with or without lateral displacement,and it is also given that some examples by analyzing the calculated length for steel column of single-story framed-bent workshop.
It is described the design method for steel column of space grid structure with or without lateral displacement,and it is also given that some examples by analyzing the calculated length for steel column of single-story framed-bent workshop.
2008, 38(9): 16-18.
doi: 10.13204/j.gyjz200809006
Abstract:
According to engineering design practice,it is analyzed and described that the application of steel grid frame in industrial workshop with large space between columns,structure lectotype,effect factor of steel dosage and the common principle for grid frame design.
According to engineering design practice,it is analyzed and described that the application of steel grid frame in industrial workshop with large space between columns,structure lectotype,effect factor of steel dosage and the common principle for grid frame design.
2008, 38(9): 19-21.
doi: 10.13204/j.gyjz200809007
Abstract:
By comparing the solutions and analysis,it is indicated that the geometric stability,load transfer way,steel dosage of the derived structure system from a common grid frame by removing its many members.It also is discussed how to use spatial truss in workshops with middle/small space between columns.
By comparing the solutions and analysis,it is indicated that the geometric stability,load transfer way,steel dosage of the derived structure system from a common grid frame by removing its many members.It also is discussed how to use spatial truss in workshops with middle/small space between columns.
2008, 38(9): 22-26.
doi: 10.13204/j.gyjz200809008
Abstract:
The stress performance of the space truss as a roof structural system is studied from geometric stability,load transfer paths,stress sensitivity,in order to give theoretic references for structure model selecting,modelling,detailed design or check of drawings.
The stress performance of the space truss as a roof structural system is studied from geometric stability,load transfer paths,stress sensitivity,in order to give theoretic references for structure model selecting,modelling,detailed design or check of drawings.
2008, 38(9): 27-30.
doi: 10.13204/j.gyjz200809009
Abstract:
Air-conditioning platforms are widely used in modern industrial workshops,thus appropriately setting methods for them are very important.In order to design the air-conditioning platform well and gain the best technical and economic effects,further study and demonstration are worthy to be done.It is briefly discussed the setting method of air-conditioning platform just in structural view of point,and is contrastsed several schemes.And it is also introduced the structural design of the platform inside a lattice grid frame.
Air-conditioning platforms are widely used in modern industrial workshops,thus appropriately setting methods for them are very important.In order to design the air-conditioning platform well and gain the best technical and economic effects,further study and demonstration are worthy to be done.It is briefly discussed the setting method of air-conditioning platform just in structural view of point,and is contrastsed several schemes.And it is also introduced the structural design of the platform inside a lattice grid frame.
2008, 38(9): 31-33.
doi: 10.13204/j.gyjz200809010
Abstract:
It is introduced that the structure design scheme selected for the painting workshop of FAW-Volkswagen Automobile Co.,Ltd.,the design of 24 m span steel reinforced concrete beam,the design of steel pipe roof truss and static loading test.
It is introduced that the structure design scheme selected for the painting workshop of FAW-Volkswagen Automobile Co.,Ltd.,the design of 24 m span steel reinforced concrete beam,the design of steel pipe roof truss and static loading test.
2008, 38(9): 34-37,58.
doi: 10.13204/j.gyjz200809011
Abstract:
There is no specifications for design of painting workshop for exhaust emission tower.It is expounded that the functions,features,structural scheme,calculation method and construction measure of the emission tower.Simplified methods are proposed according to the fact that most of the towers have a height no more than 60 m,which may provide a guidance to design of the emission towers.
There is no specifications for design of painting workshop for exhaust emission tower.It is expounded that the functions,features,structural scheme,calculation method and construction measure of the emission tower.Simplified methods are proposed according to the fact that most of the towers have a height no more than 60 m,which may provide a guidance to design of the emission towers.
2008, 38(9): 38-41.
doi: 10.13204/j.gyjz200809012
Abstract:
It is introduced how to use light slab to solve the problem of high span seal, how to increase in cross-section of column to strengthen reinforced concrete column and how to use underpining technology solving the problem of brick wall removal during the technological reform of the welding workshop in an automobile factory,which may be a reference for old plant reconstructions.
It is introduced how to use light slab to solve the problem of high span seal, how to increase in cross-section of column to strengthen reinforced concrete column and how to use underpining technology solving the problem of brick wall removal during the technological reform of the welding workshop in an automobile factory,which may be a reference for old plant reconstructions.
2008, 38(9): 42-44.
doi: 10.13204/j.gyjz200809013
Abstract:
The formula to calculate the capacity of the reinforced concrete masonry columns under eccentric compression is got based on steel concrete structure theory and the test results by the authors.The formula agrees with that of concrete members under eccentric compression,but the expression in masonry structure is used by taking account of the effect of longitudinal deflection on the capacities,which is modified by the results of ANSYS analysis results.
The formula to calculate the capacity of the reinforced concrete masonry columns under eccentric compression is got based on steel concrete structure theory and the test results by the authors.The formula agrees with that of concrete members under eccentric compression,but the expression in masonry structure is used by taking account of the effect of longitudinal deflection on the capacities,which is modified by the results of ANSYS analysis results.
2008, 38(9): 45-47.
doi: 10.13204/j.gyjz200809014
Abstract:
The development of industrial buildings of modern iron and steel enterprise and their features are expounded comprehensively from their overall arrangement,environment of plant area and workshop,lightweight enclosure and steel bearing structure etc.Some suggestions on future development are given.Looking forward the harmony between industrial buildings and social environment,then a new image of an industrial building with the characters of times and art style could be created.
The development of industrial buildings of modern iron and steel enterprise and their features are expounded comprehensively from their overall arrangement,environment of plant area and workshop,lightweight enclosure and steel bearing structure etc.Some suggestions on future development are given.Looking forward the harmony between industrial buildings and social environment,then a new image of an industrial building with the characters of times and art style could be created.
2008, 38(9): 48-50.
doi: 10.13204/j.gyjz200809015
Abstract:
According to the vertical design of big diameter welded steel pipe workshop of Baosteel,It is analyseed the importance of all the elements in the elevation of steel rolling design.And it is also described the ways of how to integrate the elements in the elevation of steel rolling design into the principle of aesthetics of architecture that make the form of industrial construction get more modernized.
According to the vertical design of big diameter welded steel pipe workshop of Baosteel,It is analyseed the importance of all the elements in the elevation of steel rolling design.And it is also described the ways of how to integrate the elements in the elevation of steel rolling design into the principle of aesthetics of architecture that make the form of industrial construction get more modernized.
2008, 38(9): 51-52.
doi: 10.13204/j.gyjz200809016
Abstract:
To fully ensure the use function of an industrial building,the exterior surfaces which wrap up the functional space are utilized to form various and vivid architectural configurations,for seeking after an architectural design method of the buildings of a wastewater treatment plant.
To fully ensure the use function of an industrial building,the exterior surfaces which wrap up the functional space are utilized to form various and vivid architectural configurations,for seeking after an architectural design method of the buildings of a wastewater treatment plant.
2008, 38(9): 53-58.
doi: 10.13204/j.gyjz200809017
Abstract:
As one of the primary shapes of reinforced concrete special-shaped column frame,much studies ignoring additional torsion effect have finished on L shaped columns.In fact,because of the special section,L shaped column's shear center is not coincided with the centroid of section,and it is under the combined loads of normal force,bending,shear and warping torsion.The additional torsional effect of L shaped column under different directional cyclic loading is discussed by means of experimental study,and the quantitative analysis is made according to GB code about the bearing capacity calculation method of a component under combined loads.Meanwhile,the worst horizontal direction is found through analysis of test results and nonlinear program.
As one of the primary shapes of reinforced concrete special-shaped column frame,much studies ignoring additional torsion effect have finished on L shaped columns.In fact,because of the special section,L shaped column's shear center is not coincided with the centroid of section,and it is under the combined loads of normal force,bending,shear and warping torsion.The additional torsional effect of L shaped column under different directional cyclic loading is discussed by means of experimental study,and the quantitative analysis is made according to GB code about the bearing capacity calculation method of a component under combined loads.Meanwhile,the worst horizontal direction is found through analysis of test results and nonlinear program.
2008, 38(9): 59-63,121.
doi: 10.13204/j.gyjz200809018
Abstract:
Considering the factors of span-to-span ratio of the wall beam,height-to-span ratio of the trimmer beam and height-to-span ratio of the wall,the orthogonal design of two-span frame-supported multi-ribbed wall beam is done and the internal forces of the trimmer beams are calculated with finite element method.Through the visual analysis and variance analysis of the results,the significance analysis of the factors influencing the internal force of the trimmer beam is done,and the influence of the opening position in the wall is also studied.Then,the internal force coefficient of the trimmer beam is obtained through regression analysis
Considering the factors of span-to-span ratio of the wall beam,height-to-span ratio of the trimmer beam and height-to-span ratio of the wall,the orthogonal design of two-span frame-supported multi-ribbed wall beam is done and the internal forces of the trimmer beams are calculated with finite element method.Through the visual analysis and variance analysis of the results,the significance analysis of the factors influencing the internal force of the trimmer beam is done,and the influence of the opening position in the wall is also studied.Then,the internal force coefficient of the trimmer beam is obtained through regression analysis
2008, 38(9): 64-66.
doi: 10.13204/j.gyjz200809019
Abstract:
Nonlinear analysis of the behaviors of HRB500 reinforced eccentric loading columns is done using the large general structural analysis software MATLAB.The interaction between HRB500 steel bar and concrete is discussed based on the numerical result.The computing results are compared with test ones,between which there is a good agreement.
Nonlinear analysis of the behaviors of HRB500 reinforced eccentric loading columns is done using the large general structural analysis software MATLAB.The interaction between HRB500 steel bar and concrete is discussed based on the numerical result.The computing results are compared with test ones,between which there is a good agreement.
2008, 38(9): 67-69.
doi: 10.13204/j.gyjz200809020
Abstract:
According to the mechanical characteristics of short-pier shear wall, the conditions meeting the ratio of connecting beam height to its span in short-pier shear wall have been derived.From this,the defining criterion of short-pier shear wall may be presented,which may be referred to engineering design.In addition,any viewpoint different from some papers has been advanced.
According to the mechanical characteristics of short-pier shear wall, the conditions meeting the ratio of connecting beam height to its span in short-pier shear wall have been derived.From this,the defining criterion of short-pier shear wall may be presented,which may be referred to engineering design.In addition,any viewpoint different from some papers has been advanced.
2008, 38(9): 70-73.
doi: 10.13204/j.gyjz200809021
Abstract:
Based on the properties of moderate-high-rise multi-bibbed composite wall structure,displacement ductility design method is investigated.It is analyzed that the effects of the concrete ratio and longitudinal steel ratio of internal slab,section depth of side frame column and the height-width ratio of wall on the displacement ductility of composite wall according to calculation results,the concrete ratio and section depth of side frame column have more influence on displacement ductility of structure and longitudinal steel ratio is little.Finally,reference to the practice,limit value of the axial compression ratio of composite wall is suggested,the result can be applied to the structure design.
Based on the properties of moderate-high-rise multi-bibbed composite wall structure,displacement ductility design method is investigated.It is analyzed that the effects of the concrete ratio and longitudinal steel ratio of internal slab,section depth of side frame column and the height-width ratio of wall on the displacement ductility of composite wall according to calculation results,the concrete ratio and section depth of side frame column have more influence on displacement ductility of structure and longitudinal steel ratio is little.Finally,reference to the practice,limit value of the axial compression ratio of composite wall is suggested,the result can be applied to the structure design.
2008, 38(9): 74-76,81.
doi: 10.13204/j.gyjz200809022
Abstract:
Because little research has been done on the affection of high temperature and constant temperature time to concrete mechanical properties at home and abroad and the damage detection technology of fire-damaged concrete is lacking,high temperature test of concrete test is presented.Through the splitting tensile strength test of concrete at different temperature and different constant temperature time,the coupling relationship among temperature,constant temperature time and splitting tensile strength of concrete is enduced,and the formula of concrete splitting tensile strength after high temperature is established.Based on the results of test,three-dimensional surface of temperature,constant temperature time and splitting tensile strength of concrete is fitted
Because little research has been done on the affection of high temperature and constant temperature time to concrete mechanical properties at home and abroad and the damage detection technology of fire-damaged concrete is lacking,high temperature test of concrete test is presented.Through the splitting tensile strength test of concrete at different temperature and different constant temperature time,the coupling relationship among temperature,constant temperature time and splitting tensile strength of concrete is enduced,and the formula of concrete splitting tensile strength after high temperature is established.Based on the results of test,three-dimensional surface of temperature,constant temperature time and splitting tensile strength of concrete is fitted
2008, 38(9): 77-81.
doi: 10.13204/j.gyjz200809023
Abstract:
A novel cement,magnesium phosphosilicate cement(MPSC) was studied.The main components of the cement are dead burned magnesia,phosphate and fly ash,and the content of fly ash in the dry binder is 40% by weight.MPSC has high early strength,which is very suitable for the rapid repair of deteriorated concrete structure.The bonding strength between MPSC and Portland cement concrete develops quickly.It also develops high early strength under the temperature below zero.Due to the small water to binder ratio and the special microstructure,MPSC possesses of higher resistantce to freezing-thawing cycle scaling.
A novel cement,magnesium phosphosilicate cement(MPSC) was studied.The main components of the cement are dead burned magnesia,phosphate and fly ash,and the content of fly ash in the dry binder is 40% by weight.MPSC has high early strength,which is very suitable for the rapid repair of deteriorated concrete structure.The bonding strength between MPSC and Portland cement concrete develops quickly.It also develops high early strength under the temperature below zero.Due to the small water to binder ratio and the special microstructure,MPSC possesses of higher resistantce to freezing-thawing cycle scaling.
2008, 38(9): 82-84.
doi: 10.13204/j.gyjz200809024
Abstract:
In order to research the mechanical properties and deformability of pisolite grouting material(PGM),based on the earlier study,size effect,strength translation,different age strength and stress-strain curve of PGM were studied. By analyzing the experimental results,size effect coefficient and strength translation relation were obtained,the strength calculation formulas on different age of PGM were proposed,the stress-strain curves of PGM was plotted and the stress-strain curve of PGM and the one of ordinary were compared.
In order to research the mechanical properties and deformability of pisolite grouting material(PGM),based on the earlier study,size effect,strength translation,different age strength and stress-strain curve of PGM were studied. By analyzing the experimental results,size effect coefficient and strength translation relation were obtained,the strength calculation formulas on different age of PGM were proposed,the stress-strain curves of PGM was plotted and the stress-strain curve of PGM and the one of ordinary were compared.
2008, 38(9): 85-90,3.
doi: 10.13204/j.gyjz200809025
Abstract:
The hidden profiled sheet is more and more widely used for buildings due to its advantages of rich-looking,antileak and long service life.However because of its difficult lapping,it is easy for a leak to be produced when there are skylights,fans and clearstory etc,at the roof of a building.Auording to examples of using hidden profiled sheets,the causes of leaks and solutions are discribed.
The hidden profiled sheet is more and more widely used for buildings due to its advantages of rich-looking,antileak and long service life.However because of its difficult lapping,it is easy for a leak to be produced when there are skylights,fans and clearstory etc,at the roof of a building.Auording to examples of using hidden profiled sheets,the causes of leaks and solutions are discribed.
2008, 38(9): 91-95.
doi: 10.13204/j.gyjz200809026
Abstract:
Hybridized space structure consists of different kinds of single structural types,in which the whole prestressing process analysis is the key and difficulty.Based on some species of typical hybridized space structures projects,the prestressing simulation and analysis methods in different kinds of structural types of hybridized space structures are discussed in detail.Some methods such as iterative method,sequential analysis method,increasing and decreasing temperature method,jack simulation method and influence matrix iterative method,etc.,are presented to perfect the prestressing analysis theory of hybridized space structure.Moreover,the methods are verified through analysis results of practical engineerings
Hybridized space structure consists of different kinds of single structural types,in which the whole prestressing process analysis is the key and difficulty.Based on some species of typical hybridized space structures projects,the prestressing simulation and analysis methods in different kinds of structural types of hybridized space structures are discussed in detail.Some methods such as iterative method,sequential analysis method,increasing and decreasing temperature method,jack simulation method and influence matrix iterative method,etc.,are presented to perfect the prestressing analysis theory of hybridized space structure.Moreover,the methods are verified through analysis results of practical engineerings
2008, 38(9): 96-98.
doi: 10.13204/j.gyjz200809027
Abstract:
The lattice SRC structure is used in some 24 m-span transfer structure in one building.This paper introduces the key points of its design and construction.To satisfy working performance of joints,the haunched beam and the reinforced truss at joints are applied properly,meanwhile the formula for shear strength and the analysis of rotational stiffness are presented in detail.The design idea and construction measures may be a reference for similar structures.
The lattice SRC structure is used in some 24 m-span transfer structure in one building.This paper introduces the key points of its design and construction.To satisfy working performance of joints,the haunched beam and the reinforced truss at joints are applied properly,meanwhile the formula for shear strength and the analysis of rotational stiffness are presented in detail.The design idea and construction measures may be a reference for similar structures.
2008, 38(9): 99-103.
doi: 10.13204/j.gyjz200809028
Abstract:
ANSYS,a large general FEM software,is selected to analyze high strength bolt in extended end-plate connections,about Mises stress nephogram,deformation of end-plate,distribution of prying force and tensile force of bolt.Prying force is proved to exist according to the results of FEM analysis.The influence of prying force descends obviously by the thickness of end-plate and the stiffener.It indicates that the prying force increases the tensile force of bolt assuredly.The tensile force's distribution of high strength bolt is a trapezoid which is rolled by the center of compression flange.By the result of calculation formula,it indicates that the formula of prying force is simple and applicable for design.
ANSYS,a large general FEM software,is selected to analyze high strength bolt in extended end-plate connections,about Mises stress nephogram,deformation of end-plate,distribution of prying force and tensile force of bolt.Prying force is proved to exist according to the results of FEM analysis.The influence of prying force descends obviously by the thickness of end-plate and the stiffener.It indicates that the prying force increases the tensile force of bolt assuredly.The tensile force's distribution of high strength bolt is a trapezoid which is rolled by the center of compression flange.By the result of calculation formula,it indicates that the formula of prying force is simple and applicable for design.
2008, 38(9): 104-106.
doi: 10.13204/j.gyjz200809029
Abstract:
The desired pouring quality of core concrete is quite important to ensure the strength of concrete,as well as the composite action between the steel tube and its core concrete,and thus to make concrete filled steel tube works safely in a structural system.This paper is an attempt to use the process method(this method emphases on controlling the results by controlling process) presented in ISO9000 Quality Management System Standards to control the pouring quality of core concrete in concrete-filled steel tube.The method introduced in this paper maybe reference for concrete filled steel tubular engineering project.
The desired pouring quality of core concrete is quite important to ensure the strength of concrete,as well as the composite action between the steel tube and its core concrete,and thus to make concrete filled steel tube works safely in a structural system.This paper is an attempt to use the process method(this method emphases on controlling the results by controlling process) presented in ISO9000 Quality Management System Standards to control the pouring quality of core concrete in concrete-filled steel tube.The method introduced in this paper maybe reference for concrete filled steel tubular engineering project.
2008, 38(9): 107-111.
doi: 10.13204/j.gyjz200809030
Abstract:
The concrete for frame columns on the 5th floor for a tall building is unacceptable.Therefore,the method of replaced concrete is selected.Computer-control system and strain gauges are used during construction by this strengthening method;meanwhile mechanical jacks are also used in unloading process,by which the internal forces,deformation,residual deformation of the structure at replaced concrete position can be reflected accurately.The displacement of the structure is monitored by micrometers,which provides reliable basis for unloading,thus the safety of the operators and the structure can be ensured during the construction of strengthening the structure.
The concrete for frame columns on the 5th floor for a tall building is unacceptable.Therefore,the method of replaced concrete is selected.Computer-control system and strain gauges are used during construction by this strengthening method;meanwhile mechanical jacks are also used in unloading process,by which the internal forces,deformation,residual deformation of the structure at replaced concrete position can be reflected accurately.The displacement of the structure is monitored by micrometers,which provides reliable basis for unloading,thus the safety of the operators and the structure can be ensured during the construction of strengthening the structure.
2008, 38(9): 112-115.
doi: 10.13204/j.gyjz200809031
Abstract:
Six-story 17.6-meter-span prestressed concrete frames were used for a library.As the formwork was rare for the construction of three floors,the formwork in the first floor was moved mistakenly into the third floor for its concrete cast before prestessing tendons in the first floor were tensioned.Thus,cracks appeared on the mid-span of the first-story beams,and their width was over 1.0 mm,and height extended to bottom of slab.Pretressing tendons in frame beams of first and second floors were pulled immediately after the accident.Although major cracks on the beams were closed,the width of partial cracks was still above 0.1 mm.The reason of appearance of construction cracks was analyzed.The frame structures with construction cracks were evaluated,and retrofit scheme was proposed.It can be served as reference for prevention of the same engineering accident.
Six-story 17.6-meter-span prestressed concrete frames were used for a library.As the formwork was rare for the construction of three floors,the formwork in the first floor was moved mistakenly into the third floor for its concrete cast before prestessing tendons in the first floor were tensioned.Thus,cracks appeared on the mid-span of the first-story beams,and their width was over 1.0 mm,and height extended to bottom of slab.Pretressing tendons in frame beams of first and second floors were pulled immediately after the accident.Although major cracks on the beams were closed,the width of partial cracks was still above 0.1 mm.The reason of appearance of construction cracks was analyzed.The frame structures with construction cracks were evaluated,and retrofit scheme was proposed.It can be served as reference for prevention of the same engineering accident.
2008, 38(9): 114-116.
doi: 10.13204/j.gyjz200809032
Abstract:
The checked concrete strength of R.C.single foundations under columns is less than C10 in case of a steel structural factory that is under construction.The composite structure of steel and R.C.is used to strengthen the R.C. single foundations,which makes their strength meet the requirements.Based on different forced features,two schemes are designed to strengthen side and middle columns.The methods and orders of construction are discussed.The strengthened R.C.single foundation have enough strength and economic benefit.The design and construction schemes may be a reference for the same kind project.
The checked concrete strength of R.C.single foundations under columns is less than C10 in case of a steel structural factory that is under construction.The composite structure of steel and R.C.is used to strengthen the R.C. single foundations,which makes their strength meet the requirements.Based on different forced features,two schemes are designed to strengthen side and middle columns.The methods and orders of construction are discussed.The strengthened R.C.single foundation have enough strength and economic benefit.The design and construction schemes may be a reference for the same kind project.
2008, 38(9): 117-118.
doi: 10.13204/j.gyjz200809033
Abstract:
It was presented that the phenomenon and cause of crack rebar corrosion of frame columns according to case histories.It was also pointed out that a higher content of chloride ion in concrete was the main cause of rebar corrosion.it was finally proposed the scheme of replacing all the concrete containing chloride ion in the columns by replaced concrete strengthening,whose construction key points were given.
It was presented that the phenomenon and cause of crack rebar corrosion of frame columns according to case histories.It was also pointed out that a higher content of chloride ion in concrete was the main cause of rebar corrosion.it was finally proposed the scheme of replacing all the concrete containing chloride ion in the columns by replaced concrete strengthening,whose construction key points were given.
2008, 38(9): 119-121.
doi: 10.13204/j.gyjz200809034
Abstract:
Through investigation on the project application of the previous composite pile of precast pile and caisson pile in Ningbo,and combined the construction technology of prestressed pipe pile and caisson pile,it is advanced a new composite pile of prestressed pipe pile and caisson pile,and some suggestions on its construction technology and structural design are also proposed.
Through investigation on the project application of the previous composite pile of precast pile and caisson pile in Ningbo,and combined the construction technology of prestressed pipe pile and caisson pile,it is advanced a new composite pile of prestressed pipe pile and caisson pile,and some suggestions on its construction technology and structural design are also proposed.
