CN111398042A - Pressure-bearing double-row test rack for placing corbels on inner cylinder of steel platform and test method of test rack - Google Patents
Pressure-bearing double-row test rack for placing corbels on inner cylinder of steel platform and test method of test rack Download PDFInfo
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- CN111398042A CN111398042A CN202010216853.4A CN202010216853A CN111398042A CN 111398042 A CN111398042 A CN 111398042A CN 202010216853 A CN202010216853 A CN 202010216853A CN 111398042 A CN111398042 A CN 111398042A
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- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a pressure-bearing double-row test rack for placing brackets on an inner cylinder of a steel platform and a test method thereof.
Description
Technical Field
The invention relates to a pressure-bearing double-row test rack for placing corbels on an inner cylinder of a steel platform and a test method thereof.
Background
The super high-rise building construction technology of China is ahead of the world, the height of the built Shanghai center reaches 632m, the building is the second high-rise building of the world, the top ten high-rise buildings of the world are ranked, half of China has monopolized, and at present, many famous super high-rise buildings in China are built, such as Beijing Chinese goblet, Wuhan greenbelt center, Hefeibang center and the like. The construction of the super high-rise building in China mainly adopts two technical systems, namely an integral steel platform system and a hydraulic creeping formwork system, wherein the integral steel platform is a super high-rise building construction technical system generally accepted by the building engineering field in China, and is fully practiced in important projects such as the eastern Mingzhu television station, Shanghai Jinmao building, global finance center, Shanghai center and the like, a relatively complete technical system is formed, and the integral steel platform system is, is and will be widely applied to the super high-rise building construction engineering in China.
In the construction of the core tube of the super high-rise building, the whole steel platform is generally lifted integrally by adopting a staged jacking method or a staged lifting method, in the concrete pouring construction stage of the core tube, all construction loads of the whole steel platform and the upper part of the whole steel platform are transferred to the concrete structure of the core tube through the shelving bracket system at the bottom of the scaffold in the inner tube of the steel platform, the structural strength and the rigidity of the steel platform structure are good, and the main weak position and the potential safety hazard of the steel platform system can be considered to be at the shelving bracket position and the core tube concrete local structure which is in contact with the shelving bracket to transfer force. At present, the research on the bearing capacity and the failure mode of the placing bracket and the local bearing position of the concrete is not fully developed, no mature experimental research means and theoretical research results exist, and the experiment needs to be in advance of the theory and needs to be an urgent need. Therefore, a test device and a matching method technical system thereof are needed to solve the problem of safety evaluation of a support system of the super high-rise building integral steel platform construction technology and can systematically research the characteristics of the integral steel platform system for placing the bracket and the local pressure-bearing structure of the super high-rise building core tube concrete structure.
Disclosure of Invention
The invention aims to provide a pressure-bearing double-row test rack for placing corbels on an inner cylinder of a steel platform and a test method thereof.
In order to solve the problems, the invention provides a pressure-bearing double-row test rack for placing brackets on an inner cylinder of a steel platform, which comprises:
a base plate 1;
the shear walls 2 are fixed on the bottom plate 1 and are arranged oppositely at a preset distance;
a counterforce frame system connected with the bottom plate 1;
the platform system is positioned between the shear walls 2, two sides of the platform system respectively correspond to two extended placing brackets 9 to form a double-row structure, and the placing brackets 9 are respectively erected on the shear walls 2;
the bottom end of the loading system is connected with the platform system, the top end of the loading system is connected with the counterforce frame system, and the loading system is used for applying a downward axial force to the platform system;
and the control system is respectively connected with the loading system and the platform system and is used for respectively controlling the stretching of the shelving bracket 9 and the loading system.
Further, in the pressure-bearing double-row test frame with the corbels placed on the inner cylinder of the steel platform, each shear wall 2 is provided with two corbel pin shells 11 with the same height or groove-shaped spaces formed by the corbel pin shells 11, and each placed corbel 9 extends into the corresponding corbel pin shell 11 or the groove-shaped space.
Further, in the double-row test stand of bracket pressure-bearing is shelved to above-mentioned steel platform inner tube, reaction frame system includes:
two bottom balance beams 3 embedded in the bottom plate 1;
two top balance beams 4;
the height of the shear wall is higher than that of four vertical steel columns 5 of the shear wall 2, the lower end of each vertical steel column 5 is connected with a bottom balance beam 3, and the upper end of each vertical steel column 5 is connected with a top balance beam 4.
Further, in the double-row test stand for bearing bracket pressure arranged on the inner cylinder of the steel platform, the platform system comprises:
the platform comprises a platform frame 8, wherein the platform frame 8 is a rectangular frame formed by a plurality of H-shaped steel platform beams;
the shelf bracket 9 is a telescopic steel component, and the shelf bracket 9 is a telescopic steel component;
the bracket pushing oil cylinder 10 is a horizontally telescopic actuating device, and the rear end of the placing bracket 9 is connected with the bracket pushing oil cylinder 10;
the bracket fixing boots 12 are boot-shaped steel components with holes reserved in the middle, the bracket fixing boots 12 are fixed to the side edge positions of the platform frame 8, the middle of the bracket fixing boots 12 is reserved with holes for the bracket 9 to pass through, the bracket fixing boots 12 fix the freedom degrees of the bracket 9 in the left direction and the right direction, and the bracket 9 is only made to stretch in the front direction and the back direction under the action of the bracket pushing oil cylinders 10.
Further, in the double-row test rack for bearing bracket pressure on the inner cylinder of the steel platform, the loading system comprises:
the four hydraulic oil cylinders 6 are vertical actuating devices, and the rear ends of the hydraulic oil cylinders 6 are fixed at the lower ends of the top balance beams 4;
the four-shaft force sensor system comprises four shaft force sensors 7, wherein each shaft force sensor 7 is a sensor for monitoring the output shaft force of each hydraulic oil cylinder 6, the front end of a telescopic rod of each hydraulic oil cylinder 6 is fixedly connected with a corresponding shaft force sensor 7, and each shaft force sensor 7 is connected with a platform frame 8.
Further, in the double-row test rack for bearing the bracket on the inner cylinder of the steel platform, the control system is used for controlling the axial force and the telescopic posture of the hydraulic oil cylinder 6 and the bracket pushing oil cylinder 10 and monitoring the axial force data of the axial force sensor 7.
Further, in the double-row test frame for bearing the bracket placed on the inner cylinder of the steel platform, the control system controls the hydraulic oil cylinder 6 to provide vertical force, the vertical force is transmitted to the platform frame 8 through the axial force sensor 7, the bracket fixing shoe 12 fixed on the platform frame 8 transmits the vertical force to the placed bracket 9, the placed bracket 9 is in contact with the bracket pin shell 11 or the groove-shaped space, and finally the downward axial force provided by the hydraulic oil cylinder 6 is transmitted to the shear wall 2 structure.
Further, in the double-row test frame for bearing bracket pressure on the inner cylinder of the steel platform, the vertical steel column 5 is arranged in the structure of the shear wall 2, the lower half part of the vertical steel column 5 is embedded in the shear wall 2, and the length of the bottom balance beam 3 and the length of the top balance beam 4 are consistent with the distance between the two shear walls 2.
Further, in the double-row test rack for bearing corbels on the inner cylinder of the steel platform, the vertical steel column 5 is arranged outside the structure of the shear wall 2, the length of the bottom balance beam 3 and the length of the top balance beam 4 are larger than the distance between the two shear walls 2, and the shear wall 2 is arranged in a space defined by the bottom balance beam 3, the vertical steel column 5 and the top balance beam 4.
According to another aspect of the invention, a pressure-bearing double-row test method for placing a corbel on an inner cylinder of a steel platform is provided, the pressure-bearing double-row test frame for placing the corbel on the inner cylinder of the steel platform is adopted, and the method comprises the following steps:
the method comprises the following steps that firstly, the integral pouring of two shear walls 2 is completed on a bottom plate 1 according to a structural design scheme; completing construction of a counter-force frame system, installing a hydraulic oil cylinder 6 of a loading system at the lower end of a top balance beam 4 of the counter-force frame system, installing an axial force sensor 7 of the loading system at the lower end of a telescopic rod of the hydraulic oil cylinder 6 of the loading system, constructing the platform system on a bottom plate 1, controlling a resting bracket 9 of the platform system to be in a retraction state through a bracket pushing oil cylinder 10 of the platform system, controlling the hydraulic oil cylinder 6 to extend the telescopic rod through the control system, enabling the axial force sensor 7 at the lower end of the telescopic rod to be in contact with the upper end of a platform frame 8 of the platform system, and firmly fixing the axial force sensor 7 and the platform frame 8;
step two, controlling four hydraulic oil cylinders 6 of the loading system to synchronously contract telescopic rods thereof through the control system, so that the platform frame 8 is integrally lifted to the height of a bracket pin shell 11 or a groove-shaped space of the shear wall 2;
thirdly, controlling a bracket pushing oil cylinder 10 of the platform system to extend out to push the placed bracket 9 to extend out of a bracket fixing boot 12 of the platform system for a preset distance through the control system, and extending into a bracket pin shell 11 or a groove-shaped space on the structure of the shear wall 2;
controlling four hydraulic oil cylinders 6 of the loading system to apply downward axial force to the platform system through the control system;
step five, in the process of applying downward axial force, monitoring the magnitude of the downward axial force in real time through an axial force sensor 7, controlling the magnitude and the posture of the output axial force of a hydraulic oil cylinder 6, and simultaneously monitoring the deformation and the damage condition of the concrete structure near a bracket pin shell 11 or a groove-shaped space on the shear wall 2 in real time;
step six, continuously applying a downward axial force according to a test scheme, after the purpose of the test is achieved, controlling four hydraulic cylinders 6 of the loading system to reduce the vertical force axial force through the control system so that the vertical contact force between the placed bracket 9 and the bracket pin shell 11 or the groove-shaped space is zero, and controlling the bracket pushing cylinder 10 to contract through the control system so as to retract the placed bracket 9 into the bracket fixing boot 12; and controlling the hydraulic oil cylinder 6 to extend so as to lower the platform system onto the base plate 1 and form stable contact, and loosening the fixation of the axial force sensor 7 and the platform system until the test is finished.
Compared with the prior art, the device comprises a bottom plate 1, a shear wall 2, a reaction frame system, a platform system, a loading system and a control system, can be used for a pressure-bearing local strength test of a core tube reinforced concrete shear wall structure of a super high-rise building, and can perform safety evaluation on a support system of the whole steel platform construction technology of the super high-rise building.
Drawings
FIG. 1 is a schematic diagram of a double-row pressure-bearing test stand for placing corbels on an inner cylinder of a steel platform according to an embodiment of the invention;
FIG. 2 is a front view of a double-row pressure-bearing test stand for placing corbels on an inner cylinder of a steel platform according to an embodiment of the invention;
FIG. 3 is a top view of a double-row pressure-bearing test stand for placing corbels on an inner cylinder of a steel platform according to an embodiment of the invention;
FIG. 4 is a schematic diagram illustrating the installation of a counterforce frame of a double-row pressure-bearing test rack for placing corbels on the inner cylinder of the steel platform according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a placing bracket 9 of a double-row bearing test rack for placing brackets on an inner cylinder of a steel platform of an embodiment extending into a bracket pin shell 11;
FIG. 6 is a disassembly schematic view of a double-row pressure-bearing test stand for placing a corbel on an inner cylinder of a steel platform according to an embodiment;
FIG. 7 is a schematic view of a bottom platform frame 8 of a double row pressure bearing test rack for placing corbels on a steel platform inner cylinder, which is placed on a bottom plate 1 according to an embodiment;
FIG. 8 is a schematic view of the bottom platform frame 8 of the steel platform inner cylinder shelving bracket double row bearing test stand of an embodiment lifted to a test position;
FIG. 9 is a schematic view of a vertical steel column 5 of a double-row pressure-bearing test rack for placing corbels on an inner cylinder of a steel platform of an embodiment arranged outside a shear wall 2;
wherein, 1-a bottom plate; 2-shear walls; 3-bottom balance beam; 4-top balance beam; 5-vertical steel columns; 6-a hydraulic oil cylinder; 7-an axial force sensor; 8-a platform frame; 9-laying the bracket; 10-a bracket pushing oil cylinder; 11-bracket pin housing; 12-bracket fixing boots.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 9, the invention provides a pressure-bearing double-row test rack for placing a bracket on an inner cylinder of a steel platform, which comprises:
a base plate 1;
the shear walls 2 are fixed on the bottom plate 1 and are arranged oppositely at a preset distance;
a counterforce frame system connected with the bottom plate 1;
the platform system is positioned between the shear walls 2, two sides of the platform system respectively correspond to two extended placing brackets 9 to form a double-row structure, and the placing brackets 9 are respectively erected on the shear walls 2;
the bottom end of the loading system is connected with the platform system, the top end of the loading system is connected with the counterforce frame system, and the loading system is used for applying a downward axial force to the platform system;
and the control system is respectively connected with the loading system and the platform system and is used for respectively controlling the stretching of the shelving bracket 9 and the loading system.
The bottom plate 1 is a rectangular reinforced concrete structure plate-shaped component, and the bottom plate 1 and the shear wall 2 are connected into a whole, so that the effect of supporting the shear wall 2 is achieved, and stable support is provided for the whole test frame.
The invention comprises a bottom plate 1, a shear wall 2, a counterforce frame system, a platform system, a loading system and a control system, can be used for a pressure-bearing local strength test of a core tube reinforced concrete shear wall structure of a super high-rise building, and can carry out safety evaluation on a support system of the whole steel platform construction technology of the super high-rise building.
As shown in fig. 1 to 9, in an embodiment of the steel platform inner cylinder bracket-resting pressure-bearing double-row test stand according to the present invention, each shear wall 2 is provided with two bracket pin housings 11 having the same height or a groove-shaped space formed by the bracket pin housings 11, and each resting bracket 9 extends into the corresponding bracket pin housing 11 or the groove-shaped space.
The shear wall 2 is an integrally cast-in-place super high-rise building core tube shear wall structure, a bracket pin shell 11 is arranged on the shear wall 2, the structural form of the shear wall 2 is determined according to the design scheme of the core tube structure, the shear wall can be of an integrally cast reinforced concrete structure or an integrally cast reinforced concrete structure, two shear walls 2 with the same specification are positioned at two sides of the upper part of the bottom plate 1, the distance between the two shear walls 2 is determined according to the design scheme of the super high-rise building, and four bracket pin shells 11 with the same height are arranged on the inner sides of the two shear walls 2; the bracket pin shell 11 is a steel shell structure for placing the bracket 9, and the installation height of the bracket pin shell 11 is determined according to a test design scheme.
The bracket pin shell 11 is installed together with a template before the shear wall 2 is poured, the template is used as a mold when the shear wall 2 is subjected to integral concrete pouring construction, after the integral concrete pouring of the shear wall 2 is finished and the strength of the concrete is formed, the template is firstly removed, the bracket pin shell 11 can be left on the shear wall 2, the bracket pin shell 11 can also be removed, and a groove-shaped space for placing the bracket 9 to extend into is formed on the shear wall 2;
if the bracket pin shell 11 is left on the shear wall 2, the placing bracket 9 is placed on the bracket pin shell 11, and the vertical load of the placing bracket 9 is indirectly transmitted to the structure of the shear wall 2 through the bracket pin shell 11;
if the bracket pin shell 11 is not left on the shear wall 2, the bracket 9 is directly placed on the concrete structure of the groove-shaped space of the shear wall 2, and the vertical load is directly transmitted to the structure of the shear wall 2.
As shown in fig. 1 to 9, in an embodiment of the invention, in which a corbel is placed on an inner cylinder of a steel platform, the reaction frame system includes:
two bottom balance beams 3 embedded in the bottom plate 1;
two top balance beams 4;
the height of the shear wall is higher than that of four vertical steel columns 5 of the shear wall 2, the lower end of each vertical steel column 5 is connected with a bottom balance beam 3, and the upper end of each vertical steel column 5 is connected with a top balance beam 4.
The reaction frame system is a self-balancing system for providing test reaction and consists of a bottom balance beam 3, a top balance beam 4 and a vertical steel column 5; the bottom balance beam 3 is two H-shaped steel components, and the bottom balance beam 3 is embedded in the bottom plate 1; the top balance beam 4 is a frame formed by welding two H-shaped steel main beams and four H-shaped steel transverse connecting beams, and is horizontally and transversely arranged above the whole device, and the length of the top balance beam 4 is the same as that of the bottom balance beam 3; the vertical steel columns 5 are four H-shaped steel components and are vertically arranged on the bottom plate 1, the height of each vertical steel column 5 is higher than that of the shear wall 2, the lower end of each vertical steel column 5 is connected with the bottom balance beam 3, and the upper end of each vertical steel column 5 is connected with the top balance beam 4 to form a vertical rectangular frame structure.
As shown in fig. 1 to 9, in an embodiment of the invention, in which a corbel is placed on an inner cylinder of a steel platform, the platform system includes:
the platform comprises a platform frame 8, wherein the platform frame 8 is a rectangular frame formed by a plurality of H-shaped steel platform beams;
the shelf bracket 9 is a telescopic steel component, and the shelf bracket 9 is a telescopic steel component;
the bracket pushing oil cylinder 10 is a horizontally telescopic actuating device, and the rear end of the placing bracket 9 is connected with the bracket pushing oil cylinder 10;
the bracket fixing boots 12 are boot-shaped steel components with holes reserved in the middle, the bracket fixing boots 12 are fixed to the side edge positions of the platform frame 8, the middle of the bracket fixing boots 12 is reserved with holes for the bracket 9 to pass through, the bracket fixing boots 12 fix the freedom degrees of the bracket 9 in the left direction and the right direction, and the bracket 9 can only be placed in the front direction and the rear direction to stretch under the action of the bracket pushing oil cylinders 10.
The platform system is the same as a platform frame at the bottom of an integral steel platform inner cylinder scaffold and comprises a platform frame 8, a placing bracket 9, a bracket pushing cylinder 10 and a bracket fixing shoe 12; the platform frame 8 is a rectangular frame formed by a plurality of H-shaped steel platform beams, the shelving bracket 9 is a telescopic steel component, the bracket pushing oil cylinder 10 is a horizontally telescopic actuating device, the rear end of the shelving bracket 9 is connected with the bracket pushing oil cylinder 10, the telescopic action of the bracket pushing oil cylinder is controlled by the bracket pushing oil cylinder 10, the bracket fixing shoe 12 is a boot-shaped steel component with a hole reserved in the middle and is fixed at the side position of the platform frame 8, the shelving bracket 9 penetrates through the hole reserved in the middle of the bracket fixing shoe 12, the bracket fixing shoe 12 fixes the freedom degree of the shelving bracket 9 in the left direction and the right direction, so that the shelving bracket 9 can only do telescopic movement in the front direction and the rear direction under the action of the bracket pushing oil cylinder 10, and the shelving bracket 9 extends into a bracket pin shell 11 on the shear wall 2.
As shown in fig. 1 to 9, in an embodiment of the invention, in which a corbel is placed on an inner cylinder of a steel platform, the loading system includes:
the four hydraulic oil cylinders 6 are vertical actuating devices, and the rear ends of the hydraulic oil cylinders 6 are fixed at the lower ends of the top balance beams 4;
the four-shaft force sensor system comprises four shaft force sensors 7, wherein each shaft force sensor 7 is a sensor for monitoring the output shaft force of each hydraulic oil cylinder 6, the front end of a telescopic rod of each hydraulic oil cylinder 6 is fixedly connected with a corresponding shaft force sensor 7, and each shaft force sensor 7 is connected with a platform frame 8.
The loading system consists of a hydraulic oil cylinder 6 and an axial force sensor 7; the hydraulic oil cylinders 6 are vertical actuating devices which can be accurately controlled, have vertical telescopic freedom degrees and can provide downward axial force, and are four in total, the rear ends of the hydraulic oil cylinders 6 are fixed at the lower ends of the top balance beams 4, and the front ends of telescopic rods of the hydraulic oil cylinders 6 are connected and fixed with the axial force sensors 7; the axial force sensor 7 is a sensor for monitoring the output axial force of the hydraulic oil cylinder 6, and the axial force sensor 7 is positioned at the front end of the hydraulic oil cylinder 6 and is connected with an expansion link of the hydraulic oil cylinder 6 and a platform frame 8.
As shown in fig. 1 to 9, in an embodiment of the invention, in which the corbel pressure-bearing double-row test stand is placed on the inner cylinder of the steel platform, the control system is used for controlling the axial force and the telescopic posture of the hydraulic oil cylinder 6 and the corbel pushing oil cylinder 10, and monitoring the axial force data of the axial force sensor 7.
Here, the control system is an electronic system for accurately controlling the axial force and the telescopic posture of the hydraulic oil cylinder 6 and the bracket pushing oil cylinder 10, and the control system can also monitor the axial force data of the axial force sensor 7.
As shown in fig. 1 to 9, in an embodiment of the pressure-bearing double-row test stand for the inner cylinder of the steel platform for placing the bracket, under the control of a control system, the hydraulic cylinder 6 provides a vertical force, the vertical force is transmitted to the platform frame 8 through the axial force sensor 7, the bracket fixing shoe 12 fixed on the platform frame 8 transmits the vertical force to the placing bracket 9, the placing bracket 9 is in contact with the bracket pin housing 11 or the groove-shaped space, and finally the downward axial force provided by the hydraulic cylinder 6 is transmitted to the structure of the shear wall 2.
As shown in fig. 1 to 8, in an embodiment of the invention, in which a corbel-bearing double-row test rack is placed on an inner cylinder of a steel platform, the vertical steel column 5 is arranged in a shear wall 2 structure, the lower half part of the vertical steel column 5 is embedded in the shear wall 2, and the lengths of the bottom balance beam 3 and the top balance beam 4 are consistent with the distance between the two shear walls 2.
As shown in fig. 9, in an embodiment of the double-row test rack for bearing corbels on the inner cylinder of the steel platform, the vertical steel columns 5 are arranged outside the structure of the shear wall 2, the structure of the shear wall 2 is separated from the vertical steel columns 5, the length of the bottom balance beam 3 and the length of the top balance beam 4 are greater than the distance between the two shear walls 2, and the shear wall 2 is arranged inside a space surrounded by the bottom balance beam 3, the vertical steel columns 5 and the top balance beam 4.
According to another aspect of the invention, the invention further provides a pressure-bearing double-row test method for placing the corbel on the inner cylinder of the steel platform, which adopts any one of the pressure-bearing double-row test racks for placing the corbel on the inner cylinder of the steel platform, and the method comprises the following steps:
step one, test preparation: the integral casting of the two shear walls 2 is completed on the bottom plate 1 according to the structural design scheme, and a subsequent test can be performed after the concrete structure of the shear walls 2 reaches the design strength; completing construction of a counter-force frame system, installing a hydraulic oil cylinder 6 of a loading system at the lower end of a top balance beam 4 of the counter-force frame system, installing an axial force sensor 7 of the loading system at the lower end of a telescopic rod of the hydraulic oil cylinder 6 of the loading system, constructing the platform system on a bottom plate 1, controlling a resting bracket 9 of the platform system to be in a retraction state through a bracket pushing oil cylinder 10 of the platform system, controlling the hydraulic oil cylinder 6 to extend the telescopic rod through a control system, enabling the axial force sensor 7 at the lower end of the hydraulic oil cylinder to be in contact with the upper end of a platform frame 8 of the platform system, and firmly fixing the axial force sensor 7 and the platform frame 8;
step two, lifting the platform frame 8: the control system controls the four hydraulic oil cylinders 6 of the loading system to synchronously contract telescopic rods of the four hydraulic oil cylinders, so that the platform frame 8 is integrally lifted to the height of a bracket pin shell 11 or a groove-shaped space of the shear wall 2;
step three, placing the bracket 9 to stretch out: the control system controls a bracket pushing oil cylinder 10 of the platform system to extend out to push a resting bracket 9 to extend out of a bracket fixing boot 12 for a preset distance and extend into a bracket pin shell 11 or a groove-shaped space on the shear wall 2 structure;
step four, vertical loading and deformation monitoring: four hydraulic oil cylinders 6 of the loading system are controlled by the control system to apply downward axial force to the platform system, the magnitude of the axial force is determined according to the actual load of the whole steel platform, and the increasing rate and the loading time of the axial force are determined according to a test design scheme;
step five, test monitoring: in the process of applying downward axial force, the magnitude of the downward axial force is monitored in real time through the axial force sensor 7, the magnitude and the posture of the output axial force of the hydraulic oil cylinder 6 are controlled accordingly, and meanwhile, the deformation and the damage conditions of the concrete structure near the bracket pin shell 11 or the groove-shaped space on the shear wall 2 are monitored in real time;
step six, finishing the test: continuously applying a downward axial force according to a test scheme, after the purpose of the test is achieved, controlling four hydraulic cylinders 6 of the loading system to reduce the vertical force axial force until the vertical contact force between the shelf bracket 9 and the bracket pin shell 11 or the groove-shaped space is zero through the control system, and controlling the bracket pushing cylinder 10 to contract through the control system so as to retract the shelf bracket 9 into the bracket fixing boot 12; and controlling the hydraulic oil cylinder 6 to extend so as to lower the platform system onto the base plate 1 and form stable contact, and loosening the fixation of the axial force sensor 7 and the platform system until the test is finished.
Specifically, as shown in fig. 1 to 9, the double-row pressure-bearing test frame for placing the corbels on the inner cylinder of the steel platform in the embodiment is composed of a bottom plate 1, a shear wall 2, a counterforce frame system, a platform system, a loading system and a control system.
The base plate 1 of the present embodiment is a rectangular reinforced concrete structural slab member having a length of 10m and a width of 7.5 m.
The shear wall 2 of this embodiment is a 0.6m thick, 3.5m high cast-in-place super high-rise building core tube shear wall structure, and the structural style of shear wall 2 is a cast-in-place reinforced concrete structure, and two shear walls 2 with the same specification are located on two symmetrical sides of the upper portion of the bottom plate 1, and the distance between two shear walls 2 is 6.2m, and four bracket pin housings 11 with the height of 1.3m are arranged on the inner sides of two shear walls 2.
The reaction frame system of the embodiment is composed of a bottom balance beam 3, a top balance beam 4 and vertical steel columns 5. The bottom balance beam 3 is two H-shaped steel components with the length of 7.4m, and the bottom balance beam 3 is embedded in the bottom plate 1. The top balance beam 4 is a frame formed by welding two main beams of H-shaped steel with the length of 7.4mH and four transverse connecting beams of H-shaped steel with the length of 2.2 m. The vertical steel columns 5 are four H-shaped steel components with the height of 4.8m and are vertically arranged on the bottom plate 1.
The platform system of the embodiment is composed of a platform frame 8, a placing bracket 9, a bracket pushing cylinder 10 and a bracket fixing boot 12. The platform frame 8 is a rectangular frame which is formed by a plurality of H-shaped steel platform beams and is 5.8m long and 5m wide, the shape of the placed bracket 9, the bracket pushing oil cylinder 10, the bracket pin shell 11 and the bracket fixing boot 12 is shown in figure 6, the extending distance of the placed bracket 9 is 0.25m, the lap joint length of the placed bracket 9 and the bracket pin shell 11 is 0.13m, and stable support can be provided.
The loading system of the embodiment comprises a hydraulic oil cylinder 6 and an axial force sensor 7. The maximum axial force provided by the four hydraulic oil cylinders 6 is 150t, the maximum total vertical force provided by the four hydraulic oil cylinders is 600t, and the loading capacity is larger than the actual maximum gravity load of the integral steel platform.
The vertical steel column 5 is arranged in the shear wall 2 structure, the lower half portion of the vertical steel column 5 is embedded in the shear wall 2, and the length of the bottom balance beam 3 and the length of the top balance beam 4 are consistent with the distance between the two shear walls 2.
The bracket pin shell 11 is left on the shear wall 2, the bracket 9 is placed on the bracket pin shell 11 in the test, and the vertical load of the placed bracket 9 is indirectly transmitted to the structure of the shear wall 2 through the bracket pin shell 11.
The embodiment is mainly used for the test of the pressure-bearing local strength of the core tube reinforced concrete shear wall structure of the super high-rise building, and the test method comprises six steps:
step one, test preparation: integrally pouring the two shear walls 2 on the bottom plate 1 according to the structural design scheme, and carrying out subsequent tests after the strength of the concrete structure reaches 70% of the design strength; completing the construction of a counterforce system, and firmly overlapping the platform system and the loading system;
step two, lifting the platform frame 8: the control system controls the four hydraulic oil cylinders 6 to synchronously contract the telescopic rods thereof, so that the platform frame 8 is integrally lifted by 1.3m to reach the height of the bracket pin shell 11;
step three, placing the bracket 9 to stretch out: the bracket pushing oil cylinder 10 is controlled by the control system to extend out to push the placing bracket 9 to extend out 0.25m from the bracket fixing boot 12 and extend into a bracket pin shell 11 on the shear wall 2 structure, and the overlapping depth of the bracket pushing oil cylinder and the bracket pin shell is 0.13 m;
step four, vertical loading and deformation monitoring: the four hydraulic oil cylinders 6 of the loading system are controlled by the control system to apply downward axial force to the platform system, the magnitude of the axial force is 50t, the total vertical load is 200t, under the condition of simulating normal use, the vertical load transmitted to the resting bracket 9 by the whole steel platform system is simulated, and the increasing rate of the axial force is 5 t/min;
step five, test monitoring: the method comprises the following steps that when vertical load is applied, the magnitude of downward axial force is monitored in real time through an axial force sensor 7, and meanwhile, the deformation and damage conditions of a concrete structure near a bracket pin shell 11 on a shear wall 2 are monitored in real time through a high-definition camera and an image analysis system;
step six, finishing the test: after the downward axial force is continuously applied for 6 hours according to the test scheme, the control system controls the four hydraulic oil cylinders 6 of the loading system to reduce the vertical force axial force until the vertical contact force between the placed bracket 9 and the bracket pin shell 11 is zero, and the control system controls the bracket pushing oil cylinder 10 to contract to retract the placed bracket 9 into the bracket fixing boot 12; and (3) controlling the hydraulic oil cylinder 6 to extend, lowering the platform system onto the base plate 1 to form stable contact, and loosening the fixation of the axial force sensor 7 and the platform system until the test is finished.
Compared with the prior art, the invention has the following beneficial effects:
1. the real loading condition can be reproduced: the platform system of the invention is completely consistent with the integral steel platform by using the bottom platform beam, and the vertical load provided by the loading system can be completely consistent with the gravity load of the integral steel platform, so the invention can locally reproduce the formal loading working condition of the integral steel platform system.
2. The test capability is strong, and the monitoring data is more: the loading system of the test rack device can apply vertical force larger than the actual gravity load of the steel platform, can test the limit bearing performance of the placing bracket 9 structure and the pressure-bearing part of the shear wall 2, can apply uneven load and can apply load repeatedly, can test the vertical load combination under the complex working condition, and has strong test capability; the loading system of the test rack device provided by the invention can be provided with various sensors, can measure the deformation and stress of the platform frame 8, the resting bracket 9, the bracket fixing boot 12 and the like, and can also monitor the local deformation and damage conditions of the shear wall 2 under the action of load.
3. Convenient reuse: the loading system of the test frame device can be repeatedly used, after one-time test is completed, the shear wall 2 structure is dismantled, and a new shear wall 2 structure can be poured again according to different design schemes, so that the local bearing capacity and the damage form of the shear wall 2 structures in different structural forms can be tested.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a double test stand of bracket pressure-bearing is shelved to steel platform inner tube which characterized in that includes:
a base plate (1);
the shear walls (2) are fixed on the bottom plate (1) and are arranged oppositely at a preset distance;
a counterforce frame system connected with the bottom plate (1);
the platform system is positioned between the shear walls (2), two sides of the platform system respectively correspond to two extended placing brackets (9) to form a double-row structure, and the placing brackets (9) are respectively erected on the shear walls (2);
the bottom end of the loading system is connected with the platform system, the top end of the loading system is connected with the counterforce frame system, and the loading system is used for applying a downward axial force to the platform system;
and the control system is respectively connected with the loading system and the platform system and is used for respectively controlling the stretching of the shelving bracket (9) and the loading system.
2. The steel platform inner cylinder resting corbel pressure-bearing double-row test stand according to claim 1, characterized in that each shear wall (2) is provided with two corbel pin housings (11) with the same height or a groove-shaped space formed by the corbel pin housings (11), and each resting corbel (9) extends into the corresponding corbel pin housing (11) or the groove-shaped space.
3. The steel platform inner cylinder resting corbel pressure bearing double row test stand of claim 2, wherein the counterforce frame system comprises:
two bottom balance beams (3) embedded in the bottom plate (1);
two top balance beams (4);
the height of the shear wall is higher than that of four vertical steel columns (5) of the shear wall (2), the lower end of each vertical steel column (5) is connected with one bottom balance beam (3), and the upper end of each vertical steel column (5) is connected with one top balance beam (4).
4. The steel platform inner cylinder put bracket pressure bearing double row test stand of claim 3, characterized in that the platform system comprises:
the platform comprises a platform frame (8), wherein the platform frame (8) is a rectangular frame formed by a plurality of H-shaped steel platform beams;
the resting corbel (9), wherein the resting corbel (9) is a telescopic steel component;
the bracket pushing oil cylinder (10), the bracket pushing oil cylinder (10) is a horizontally telescopic actuating device, and the rear end of the placing bracket (9) is connected with the bracket pushing oil cylinder (10);
bracket fixed boot (12), bracket fixed boot (12) are the boots form steel component of middle part stay hole, fix the side position in platform frame (8), shelve the middle part stay hole that bracket (9) passed bracket fixed boot (12), and bracket fixed boot (12) are fixed to be shelved bracket (9) and are being controlled the degree of freedom of two directions, make it only is pushed away the effect of hydro-cylinder (10) by the bracket in two directions in the front and back to shelve bracket (9) and do concertina movement.
5. The steel platform inner cylinder resting corbel pressure-bearing double row test stand of claim 4, wherein the loading system comprises:
the hydraulic oil cylinders (6) are vertical actuating devices, and the rear ends of the hydraulic oil cylinders (6) are fixed at the lower ends of the top balance beams (4);
the hydraulic system comprises four axial force sensors (7), each axial force sensor (7) is a sensor for monitoring the output axial force of the hydraulic oil cylinder (6), the front end of a telescopic rod of each hydraulic oil cylinder (6) is fixedly connected with the corresponding axial force sensor (7), and each axial force sensor (7) is connected with the platform frame (8).
6. The steel platform inner cylinder bracket pressure-bearing double-row test stand according to claim 5, characterized in that the control system is used for controlling the axial force magnitude and the telescopic posture of the hydraulic oil cylinder (6) and the bracket pushing oil cylinder (10) and monitoring the axial force data of the axial force sensor (7).
7. The steel platform inner cylinder resting bracket pressure-bearing double-row test stand according to claim 6, characterized in that the control system controls the hydraulic oil cylinder (6) to provide a vertical force, the vertical force is transmitted to the platform frame (8) through the axial force sensor (7), the bracket fixing shoe (12) fixed on the platform frame (8) transmits the vertical force to the resting bracket (9), the resting bracket (9) is in contact with the bracket pin housing (11) or the groove-shaped space, and finally the downward axial force provided by the hydraulic oil cylinder (6) is transmitted to the shear wall (2) structure.
8. The steel platform inner cylinder bracket pressure-bearing double-row test rack according to claim 5, characterized in that the vertical steel columns (5) are arranged in the structure of the shear wall (2), the lower half parts of the vertical steel columns (5) are embedded in the shear wall (2), and the lengths of the bottom balance beam (3) and the top balance beam (4) are consistent with the distance between the two shear walls (2).
9. The steel platform inner cylinder bracket pressure-bearing double-row test rack according to claim 5, characterized in that the vertical steel columns (5) are arranged outside the structure of the shear walls (2), the length of the bottom balance beam (3) and the top balance beam (4) is larger than the distance between the two shear walls (2), and the shear walls (2) are arranged inside the space surrounded by the bottom balance beam (3), the vertical steel columns (5) and the top balance beam (4).
10. A pressure-bearing double-row test method for resting corbels on an inner cylinder of a steel platform is characterized in that the pressure-bearing double-row test frame for resting corbels on the inner cylinder of the steel platform as claimed in any one of claims 1 to 9 is adopted, and the method comprises the following steps:
the method comprises the following steps that firstly, the two shear walls (2) are integrally cast on a bottom plate (1) according to a structural design scheme; completing construction of a counter-force frame system, installing a hydraulic oil cylinder (6) of a loading system at the lower end of a top balance beam (4) of the counter-force frame system, installing an axial force sensor (7) of the loading system at the lower end of a telescopic rod of the hydraulic oil cylinder (6) of the loading system, constructing the platform system on a bottom plate (1), controlling a resting bracket (9) of the platform system to be in a retraction state through a bracket pushing oil cylinder (10) of the platform system, controlling the hydraulic oil cylinder (6) to extend the telescopic rod through the control system, enabling the axial force sensor (7) at the lower end of the telescopic rod to be in contact with the upper end of a platform frame (8) of the platform system, and firmly fixing the axial force sensor (7) and the platform frame (8);
step two, controlling four hydraulic oil cylinders (6) of the loading system to synchronously contract telescopic rods of the four hydraulic oil cylinders through the control system, so that the platform frame (8) is integrally lifted to the height of a bracket pin shell (11) or a groove-shaped space of the shear wall (2);
thirdly, controlling a bracket pushing oil cylinder (10) of the platform system to extend to push the placed bracket (9) to extend out of a bracket fixing boot (12) of the platform system for a preset distance through the control system, and extending into a bracket pin shell (11) or a groove-shaped space on the shear wall (2) structure;
controlling four hydraulic oil cylinders (6) of the loading system to apply downward axial force to the platform system through the control system;
in the process of applying downward axial force, monitoring the magnitude of the downward axial force in real time through an axial force sensor (7), controlling the magnitude and the posture of the output axial force of a hydraulic oil cylinder (6), and simultaneously monitoring the deformation and the damage condition of a concrete structure near a bracket pin shell (11) or a groove-shaped space on the shear wall (2) in real time;
continuously applying a downward axial force according to a test scheme, after the purpose of the test is achieved, controlling four hydraulic cylinders (6) of the loading system to reduce the vertical force axial force through the control system so that the vertical contact force between the placed bracket (9) and the bracket pin shell (11) or the groove-shaped space is zero, and controlling the bracket pushing cylinder (10) to contract through the control system so as to retract the placed bracket (9) into the bracket fixing boot (12); and controlling the hydraulic oil cylinder (6) to extend so as to lower the platform system onto the bottom plate (1) and form stable contact, and loosening the fixation of the axial force sensor (7) and the platform system until the test is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010216853.4A CN111398042A (en) | 2020-03-25 | 2020-03-25 | Pressure-bearing double-row test rack for placing corbels on inner cylinder of steel platform and test method of test rack |
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| CN202010216853.4A CN111398042A (en) | 2020-03-25 | 2020-03-25 | Pressure-bearing double-row test rack for placing corbels on inner cylinder of steel platform and test method of test rack |
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| CN111398042A true CN111398042A (en) | 2020-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117433822A (en) * | 2023-12-20 | 2024-01-23 | 贵州省公路工程集团有限公司 | Structural performance evaluation system and method using reinforced concrete bracket as support |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117433822A (en) * | 2023-12-20 | 2024-01-23 | 贵州省公路工程集团有限公司 | Structural performance evaluation system and method using reinforced concrete bracket as support |
| CN117433822B (en) * | 2023-12-20 | 2024-02-13 | 贵州省公路工程集团有限公司 | Structural performance evaluation system and method using reinforced concrete bracket as support |
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