Steel platform inner cylinder supporting bracket for single shear wall bearing test and test method

Abstract

The present invention provides a steel platform inner cylinder supporting bracket single shear wall bearing test stand and a test method. The present invention includes a bottom plate, a shear wall, a reaction frame system, a platform system, a loading system and a control system, and can be used for the bearing local strength test of the reinforced concrete shear wall structure of the core tube of a super high-rise building, and can conduct a safety assessment on the support system of the overall steel platform construction technology of a super high-rise building.

Description

Technical Field

[0001] The present invention relates to a bearing test rack and test method for a single shear wall with a steel platform inner cylinder resting bracket Background Art

[0002] The construction technology of super high-rise buildings in China leads the world. The completed Shanghai Tower reaches a height of 632m and is the second tallest building in the world. Among the top ten tallest buildings in the world, half are in China. Currently, there are still many famous super high-rise buildings under construction in China, such as China Zun in Beijing, Greenland Center in Wuhan, and Baoneng Center in Hefei. The construction of super high-rise buildings in China mainly adopts two technical systems: the overall steel platform system and the hydraulic climbing formwork system. Among them, the overall steel platform is a super high-rise building construction technology system widely recognized in the construction engineering field in China. It has been fully practiced in major projects such as the Oriental Pearl TV Tower, Shanghai Jinmao Tower, Shanghai World Financial Center, and Shanghai Tower, and a relatively complete technical system has been formed. The overall steel platform system has been, is being, and will continue to be widely used in the construction projects of super high-rise buildings in China.

[0003] In the construction of the core tube of super high-rise buildings, the overall steel platform is generally lifted or hoisted as a whole in a staged manner. During the core tube concrete pouring construction stage, the overall steel platform and all the construction loads above it are transmitted to the core tube concrete structure through the resting bracket system at the bottom of the steel platform inner cylinder scaffold. Since the structural strength and overall stiffness of the steel platform structure are relatively good, it can be considered that the main weak position of the steel platform system is at the resting bracket position. In addition, there are also potential safety hazards in the local structure of the core tube concrete in contact with the resting bracket for force transmission. At present, the research on the bearing capacity and failure mode of the resting bracket and the local bearing position of the concrete has not been fully carried out, and there is no mature test research method and theoretical research result. Therefore, there is an urgent need to propose a test device and its supporting method technology system for the safety assessment of the support system of the overall steel platform construction technology for super high-rise buildings, which can systematically study the structural characteristics of the resting bracket of the overall steel platform system and the local bearing structure of the core tube concrete of super high-rise buildings. Summary of the Invention

[0004] The purpose of the present invention is to provide a bearing test rack and test method for a single shear wall with a steel platform inner cylinder resting bracket.

[0005] To solve the above problems, the present invention provides a bearing test rack for a single shear wall with a steel platform inner cylinder resting bracket, including:

[0006] Bottom plate 1;

[0007] A single-piece shear wall 2 fixed on the bottom plate 1;

[0008] A reaction force frame system connected to the bottom plate 1, with the shear wall 2 located within the space enclosed by the reaction force frame system;

[0009] A platform system, with a supporting bracket 9 extending from one side of the platform system, and the supporting bracket 9 being mounted on the shear wall 2;

[0010] A loading system, with the bottom end of the loading system connected to the platform system and the top end of the loading system connected to the reaction force frame system, and the loading system being used to apply a downward axial force to the platform system;

[0011] A control system connected to the loading system and the platform system respectively, for controlling the telescoping of the supporting bracket 9 and the loading system respectively.

[0012] Furthermore, in the above-mentioned steel platform inner cylinder supporting bracket single shear wall bearing pressure test stand, a bracket pin housing 11 or a groove-shaped space formed by the bracket pin housing 11 is provided on the shear wall 2, and the supporting bracket 9 extends into the bracket pin housing 11 or the groove-shaped space.

[0013] Furthermore, in the above-mentioned steel platform inner cylinder supporting bracket single shear wall bearing pressure test stand, the reaction force frame system includes:

[0014] Two bottom balance beams 3 buried in the bottom plate 1;

[0015] Two top balance beams 4;

[0016] Four vertical steel columns 5 with a height higher than the shear wall 2, with the lower end of each vertical steel column 5 connected to a bottom balance beam 3 and the upper end of each vertical steel column 5 connected to a top balance beam 4. The vertical steel columns 5 are arranged outside the structure of the shear wall 2, and the shear wall 2 is located at an eccentric position between two groups of vertical steel columns 5.

[0017] Furthermore, in the above-mentioned steel platform inner cylinder supporting bracket single shear wall bearing pressure test stand, the platform system includes:

[0018] An L-shaped platform frame 8, which is a rectangular frame composed of multiple H-shaped steel platform beams. The platform vertical frame 14 is the vertical part of the L-shaped platform frame 8 and forms an angle of 90° with the horizontal part of the L-shaped platform frame 8;

[0019] A supporting bracket 9, which is a telescopic steel member;

[0020] A bracket jacking oil cylinder 10, which is a horizontally telescopic actuator, and the rear end of the supporting bracket 9 is connected to the bracket jacking oil cylinder 10;

[0021] The bracket fixing boot 12 is a boot-shaped steel member with a hole in the middle, which is fixed on the horizontal part of the L-shaped platform frame 8. The supporting bracket 9 passes through the hole in the middle of the bracket fixing boot 12. The bracket fixing boot 12 fixes the degrees of freedom of the supporting bracket 9 in the left and right directions, so that the supporting bracket 9 only makes telescopic movements in the front and back directions under the action of the bracket pushing oil cylinder 10;

[0022] A portal bracket 13 installed in the middle of the L-shaped platform frame 8. The portal bracket 13 is a portal steel member. The portal bracket 13 is connected to the loading system. The open space under the portal bracket 13 is used to place the bracket pushing oil cylinder 10;

[0023] The guiding pulley 15 is a slidable member equipped with two pairs of roller groups, a total of four. The guiding pulley 15 is fixed on the outside of the platform vertical frame 14. The guiding pulley 15 grasps both sides of the flange of the vertical steel column 5 and slides up and down along the vertical steel column 5.

[0024] Further, in the above-mentioned steel platform inner cylinder supporting bracket single shear wall bearing pressure test frame, the loading system includes:

[0025] A hydraulic cylinder 6, which is a vertical actuating device. The rear end of the hydraulic cylinder 6 is fixed to the lower end of the top balance beam 4;

[0026] An axial force sensor 7, which is a sensor for monitoring the axial force output by the hydraulic cylinder 6. The front end of the telescopic rod of the hydraulic cylinder 6 is fixedly connected to the axial force sensor 7, and the axial force sensor 7 is connected to the portal bracket 13.

[0027] Further, in the above-mentioned steel platform inner cylinder supporting bracket single shear wall bearing pressure test frame, the control system is used to control the axial force magnitude and telescopic posture of the hydraulic cylinder 6 and the bracket pushing oil cylinder 10, and to monitor the axial force data of the axial force sensor 7.

[0028] Further, in the above-mentioned steel platform inner cylinder supporting bracket single shear wall bearing pressure test frame, the control system controls the hydraulic cylinder 6 to provide a vertical force, and transmits it to the platform frame 8 through the axial force sensor 7. The bracket fixing boot 12 fixed on the L-shaped platform frame 8 then transmits the vertical force to the supporting bracket 9. The supporting bracket 9 contacts the bracket pin housing 11 or the groove-shaped space, and finally transmits the downward axial force provided by the hydraulic cylinder 6 to the shear wall 2 structure.

[0029] According to another aspect of the present invention, there is also provided a method for testing the bearing pressure of a single shear wall with a supporting bracket in the inner cylinder of a steel platform, using the steel platform inner cylinder supporting bracket single shear wall bearing pressure test frame described in any one of the above. The method includes:

[0030] Step 1, complete the integral casting of the single-piece shear wall 2 on the base plate 1 according to the structural design plan, complete the construction of the reaction frame system, install the hydraulic cylinder 6 of the loading system on the lower end of the top balance beam 4 of the reaction frame system, install the axial force sensor 7 of the loading system on the lower end of the telescopic rod of the hydraulic cylinder 6 of the loading system, build the platform system on the base plate 1, and put the guide pulley 15 on the back of the L-shaped platform frame 8 of the platform system on the flange of the vertical steel column 5 of the reaction frame system, control the platform system's shelving corbel 9 to be in a retracted state through the corbel pushing cylinder 10 of the platform system, and control the hydraulic cylinder 6 to extend its telescopic rod through the control system so that the axial force sensor 7 at its lower end is firmly fixed to the portal bracket 13 of the platform system;

[0031] Step 2: Control the hydraulic cylinder 6 of the loading system through the control system to synchronously retract its telescopic rod, so that the L-shaped platform frame 8 is lifted as a whole to the height of the corbel pin housing 11 or the groove-shaped space of the shear wall 2;

[0032] Step 3: Control the corbel pushing cylinder 10 of the platform system through the control system to extend the corbel 9 from the corbel fixing boot 12 to a preset distance and extend into the corbel pin housing 11 or the groove-shaped space on the shear wall 2;

[0033] Step 4: Control the hydraulic cylinder 6 of the loading system through the control system to apply a downward axial force to the platform system;

[0034] Step 5: During the process of applying the downward axial force, the magnitude of the downward axial force is monitored in real time by the axial force sensor 7, and the output axial force magnitude and posture of the hydraulic cylinder 6 are controlled accordingly, while the deformation and damage of the concrete structure near the corbel pin housing 11 or the groove-shaped space on the shear wall 2 are monitored in real time;

[0035] Step six, continue to apply downward axial force according to the test plan. After achieving the purpose of this test, control the hydraulic cylinder 6 of the loading system through the control system to reduce the vertical axial force until the vertical contact force between the resting corbel 9 and the corbel pin housing 11 or the groove space is zero, and control the corbel pushing cylinder 10 to contract through the control system to retract the resting corbel 9 into the corbel fixing boot 12; control the hydraulic cylinder 6 to extend to lower the platform system onto the base plate 1 and form a stable contact, and release the fixation of the axial force sensor 7 and the platform system. The test ends here.

[0036] Compared with the prior art, the present invention includes a base plate, a shear wall, a reaction frame system, a platform system, a loading system and a control system, which can be used for the local compressive strength test of the reinforced concrete shear wall structure of the core tube of a super high-rise building, and can conduct a safety assessment of the support system of the integral steel platform construction technology of super high-rise buildings. Description of the Drawings

[0037] Figure 1 Schematic diagram of the bearing test stand for the single shear wall with a corbel for supporting the inner cylinder of the steel platform according to an embodiment of the present invention;

[0038] Figure 2 Schematic diagram of removing the shear wall 2 from the bearing test stand for the single shear wall with a corbel for supporting the inner cylinder of the steel platform according to an embodiment of the present invention;

[0039] Figure 3 Front view of the bearing test stand for the single shear wall with a corbel for supporting the inner cylinder of the steel platform according to an embodiment of the present invention;

[0040] Figure 4 Top view of the bearing test stand for the single shear wall with a corbel for supporting the inner cylinder of the steel platform according to an embodiment of the present invention;

[0041] Figure 5 Installation schematic diagram of the reaction frame of the bearing test stand for the single shear wall with a corbel for supporting the inner cylinder of the steel platform according to an embodiment of the present invention;

[0042] Figure 6 Schematic diagram of the corbel 9 of the bearing test stand for the single shear wall with a corbel for supporting the inner cylinder of the steel platform according to an embodiment of the present invention extending into the corbel pin housing 11;

[0043] Figure 7 Disassembly schematic diagram of the corbel system of the bearing test stand for the single shear wall with a corbel for supporting the inner cylinder of the steel platform according to an embodiment of the present invention;

[0044] Figure 8 Schematic diagram of the guide pulley 15 of the bearing test stand for the single shear wall with a corbel for supporting the inner cylinder of the steel platform according to an embodiment of the present invention;

[0045] Figure 9 Schematic diagram of the force - transfer platform frame 8 of the bearing test stand for the single shear wall with a corbel for supporting the inner cylinder of the steel platform according to an embodiment of the present invention being placed on the bottom plate 1;

[0046] Figure 10 Schematic diagram of the force - transfer platform frame 8 of the bearing test stand for the single shear wall with a corbel for supporting the inner cylinder of the steel platform according to an embodiment of the present invention being lifted to the test position.

[0047] Wherein, 1 - bottom plate; 2 - shear wall; 3 - bottom balance beam; 4 - top balance beam; 5 - vertical steel column; 6 - hydraulic cylinder; 7 - axial force sensor; 8 - platform frame; 9 - corbel; 10 - corbel jacking oil cylinder; 11 - corbel pin housing; 12 - corbel fixing boot; 13 - gantry bracket; 14 - balance frame; 15 - guide pulley. Detailed Description of the Invention

[0048] To make the above objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] As Figures 1 to 10 shown, the present invention provides a single shear wall bearing test rack for a steel platform inner cylinder resting bracket, including:

[0050] A bottom plate 1;

[0051] A single shear wall 2 fixed on the bottom plate 1;

[0052] A reaction frame system connected to the bottom plate 1, and the shear wall 2 is located within the space enclosed by the reaction frame system;

[0053] A platform system, with a resting bracket 9 extending from one side of the platform system, and the resting bracket 9 is mounted on the shear wall 2;

[0054] A loading system, the bottom end of the loading system is connected to the platform system, the top end of the loading system is connected to the reaction frame system, and the loading system is used to apply a downward axial force to the platform system;

[0055] A control system respectively connected to the loading system and the platform system, for respectively controlling the expansion and contraction of the resting bracket 9 and the loading system.

[0056] Here, the bottom plate 1 is a rectangular reinforced concrete structural plate-like member, and a bottom balance beam 3 is buried inside the bottom plate 1. The bottom plate 1 is integrally connected to the shear wall 2, serving to support the shear wall 2 and providing a stable support for the entire test rack.

[0057] The present invention includes a bottom plate, a shear wall, a reaction frame system, a platform system, a loading system, and a control system, and can be used for the bearing local strength test of the reinforced concrete shear wall structure of the core tube of super high-rise buildings, and can conduct a safety assessment on the support system of the overall steel platform construction technology of super high-rise buildings.

[0058] As Figures 1 to 10 shown, in an embodiment of the single shear wall bearing test rack for the steel platform inner cylinder of the present invention, a bracket pin housing 11 or a groove-shaped space formed by the bracket pin housing 11 is provided on the shear wall 2, and the resting bracket 9 extends into the bracket pin housing 11 or the groove-shaped space.

[0059] Here, the corbel pin housing 11 is installed together with the formwork before the shear wall 2 is poured. During the overall concrete pouring construction of the shear wall 2, it serves as a mold. After the overall pouring of the shear wall 2 is completed and the concrete has formed strength, first remove the formwork. The corbel pin housing 11 can be left on the shear wall 2 or removed, forming a groove-shaped space on the shear wall 2 for the corbel 9 to extend into.

[0060] If the corbel pin housing 11 is left on the shear wall 2, the corbel 9 is placed on the corbel pin housing 11, and the vertical load of the corbel 9 is indirectly transmitted to the shear wall 2 structure through the corbel pin housing 11.

[0061] If the corbel pin housing 11 is not left on the shear wall 2, the corbel 9 is directly placed on the concrete structure of the shear wall 2, and the vertical load is directly transmitted to the shear wall 2 structure.

[0062] The shear wall 2 is a core tube shear wall structure of a super high-rise building cast in situ as a whole. There is a corbel pin housing 11 on it. The structural form of the shear wall 2 is determined according to the core tube structure design scheme, and it can be a cast-in-place reinforced concrete structure as a whole or a cast-in-place steel reinforced concrete structure as a whole. The shear wall 2 is located above the floor slab 1, and there is a corbel pin housing 11 on the side of the shear wall 2; the corbel pin housing 11 is a steel shell structure for the corbel 9 to extend into, and the installation height of the corbel pin housing 11 is determined according to the test design scheme.

[0063] As Figures 1 to 10 shown, in an embodiment of the steel platform inner tube corbel single shear wall bearing test frame of the present invention, the reaction frame system includes:

[0064] Two bottom balance beams 3 buried in the floor slab 1;

[0065] Two top balance beams 4;

[0066] Four vertical steel columns 5 with a height higher than the shear wall 2. The lower end of each vertical steel column 5 is connected to a bottom balance beam 3, and the upper end of each vertical steel column 5 is connected to a top balance beam 4. The vertical steel columns 5 are arranged outside the structure of the shear wall 2, and the shear wall 2 is located at an eccentric position between two groups of vertical steel columns 5.

[0067] Here, the reaction force frame is a self - balancing system that provides the test reaction force, and it is composed of a bottom balance beam 3, a top balance beam 4, and vertical steel columns 5. The bottom balance beam 3 is composed of two H - shaped steel members, and the bottom balance beam 3 is buried 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 secondary beams, which is horizontally placed above the entire 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 members, which are arranged vertically on the bottom plate 1. The height of the vertical steel columns 5 is higher than that of the shear wall 2. The lower end of each vertical steel column 5 is connected to the bottom balance beam 3, and the upper end is connected to the top balance beam 4, forming a vertical rectangular frame structure. The vertical steel columns 5 are arranged outside the structure of the shear wall 2, and the shear wall 2 is located at an eccentric position between two groups of vertical steel columns 5, and the specific position is determined according to the test plan.

[0068] As Figures 1 to 10 shown, in an embodiment of the steel platform inner cylinder supported bracket single - shear - wall bearing test stand of the present invention, the platform system includes:

[0069] An L - shaped platform frame 8, which is a rectangular frame composed of multiple H - shaped steel platform beams. The platform vertical frame 14 is the vertical part of the L - shaped platform frame 8, and the included angle with the horizontal part of the L - shaped platform frame 8 is 90°.

[0070] A supported bracket 9, which is a retractable steel member.

[0071] A bracket jacking oil cylinder 10, which is a horizontally retractable actuating device. The rear end of the supported bracket 9 is connected to the bracket jacking oil cylinder 10.

[0072] A bracket fixing shoe 12, which is a boot - shaped steel member with a hole in the middle. It is fixed on the horizontal part of the L - shaped platform frame 8. The supported bracket 9 passes through the hole in the middle of the bracket fixing shoe 12. The bracket fixing shoe 12 fixes the degrees of freedom of the supported bracket 9 in the left - right two directions, so that the supported bracket 9 only makes telescopic movements in the front - rear two directions under the action of the bracket jacking oil cylinder 10.

[0073] A gantry bracket 13 installed in the middle of the L - shaped platform frame 8. The gantry bracket 13 is a gantry - shaped steel member. The gantry bracket 13 is connected to the loading system, and the open space under the gantry bracket 13 is used to place the bracket jacking oil cylinder 10.

[0074] A guide pulley 15, which is a slidable member equipped with two pairs of roller sets, a total of four. The guide pulley 15 is fixed on the outside of the platform vertical frame 14. The guide pulley 15 grasps both sides of the flange of the vertical steel column 5 and slides up and down along the vertical steel column 5.

[0075] Here, the platform system consists of an L-shaped platform frame 8, a supporting bracket 9, a bracket pushing oil cylinder 10, a bracket fixing boot 12, a portal frame 13, and a guiding pulley 15. The L-shaped platform frame 8 is an L-shaped rectangular frame composed of multiple H-shaped steels with relatively large stiffness. The vertical platform frame 14 is the vertical part of the L-shaped platform frame 8, and the included angle with the horizontal part of the L-shaped platform frame 8 is 90°. The guiding pulley 15 is a slidable member equipped with two pairs of roller sets, with a total of four, fixed on the outer side of the vertical platform frame 14. The guiding pulley 15 can grip both sides of the flange of the vertical steel column 5, playing a role in restricting the L-shaped platform frame 8, enabling the entire L-shaped platform frame 8 to have only the degree of freedom of vertical movement, and ensuring that the entire L-shaped platform frame 8 does not deflect during the test. The supporting bracket 9 is a telescopic steel member, and the bracket pushing oil cylinder 10 is a horizontally telescopic actuating device. The rear end of the supporting bracket 9 is connected to the bracket pushing oil cylinder 10, and its telescoping is controlled by the bracket pushing oil cylinder 10. The bracket fixing boot 12 is a boot-shaped steel member with a hole in the middle, fixed on the horizontal part of the L-shaped platform frame 8. The supporting bracket 9 passes through the hole in the middle of the bracket fixing boot 12. The bracket fixing boot 12 fixes the degrees of freedom of the supporting bracket 9 in the left and right directions, enabling the supporting bracket 9 to only perform telescopic movement under the action of the bracket pushing oil cylinder 10. The supporting bracket 9 extends into the bracket pin housing 11 on the shear wall 2. The portal frame 13 is a portal-shaped steel member, and the open space below it is used to place the bracket pushing oil cylinder 10. The portal frame 13 is installed in the middle of the L-shaped platform frame 8 and is used to connect the axial force sensor 7. The vertical load provided by the hydraulic cylinder 6 is transmitted to the L-shaped platform frame 8 through the portal frame 13.

[0076] As Figures 1 to 10 shown, in an embodiment of the steel platform inner cylinder supporting bracket single shear wall bearing pressure test stand of the present invention, the loading system includes:

[0077] A hydraulic cylinder 6, the hydraulic cylinder 6 is a vertical actuating device, and the rear end of the hydraulic cylinder 6 is fixed to the lower end of the top balance beam 4;

[0078] An axial force sensor 7, the axial force sensor 7 is a sensor for monitoring the output axial force of the hydraulic cylinder 6. The front end of the telescopic rod of the hydraulic cylinder 6 is fixedly connected to the axial force sensor 7, and the axial force sensor 7 is connected to the portal frame 13.

[0079] Here, the loading system consists of a hydraulic cylinder 6 and an axial force sensor 7. The hydraulic cylinder 6 is a vertically actuating device that can be precisely controlled, has the degree of freedom of vertical telescoping, and can provide a vertical axial force. The rear end of the hydraulic cylinder 6 is fixed to the lower end of the top balance beam 4, and the front end of the telescopic rod of the hydraulic cylinder 6 is fixedly connected to the axial force sensor 7. The axial force sensor 7 is a sensor for monitoring the output axial force of the hydraulic cylinder 6. The axial force sensor 7 is located at the front end of the hydraulic cylinder 6 and connects the telescopic rod of the hydraulic cylinder 6 and the portal frame 13.

[0080] As Figures 1 to 10 shown, in an embodiment of the bearing test frame for a single shear wall with a steel platform inner cylinder resting on a bracket, the control system is used to control the axial force magnitude and telescopic attitude of the hydraulic cylinder 6 and the bracket jacking cylinder 10, and to monitor the axial force data of the axial force sensor 7.

[0081] Herein, the control system is an electronic system for precisely controlling the axial force magnitude and telescopic attitude of the hydraulic cylinder 6 and the bracket jacking cylinder 10, and the control system can also monitor the axial force data monitored by the axial force sensor 7.

[0082] As Figures 1 to 10 shown, in an embodiment of the bearing test frame for a single shear wall with a steel platform inner cylinder resting on a bracket, the control system controls the hydraulic cylinder 6 to provide a vertical force, and transmits it to the platform frame 8 through the axial force sensor 7. The bracket fixing boot 12 fixed on the L-shaped platform frame 8 then transmits the vertical force to the resting bracket 9. The resting bracket 9 contacts the bracket pin housing 11 or the groove-shaped space, and finally transmits the downward axial force provided by the hydraulic cylinder 6 to the shear wall 2 structure.

[0083] Herein, under the control of the control system, the vertical force provided by the hydraulic cylinder 6 is transmitted to the L-shaped platform frame 8 through the axial force sensor 7 and the portal bracket 13. The bracket fixing boot 12 fixed on the L-shaped platform frame 8 then transmits the vertical force to the resting bracket 9. The resting bracket 9 contacts the bracket pin housing 11 or the groove-shaped space, and finally transmits the vertical force provided by the hydraulic cylinder 6 to the shear wall 2 structure. During the force transmission and loading process, due to the restraint of the guide pulley 15, the L-shaped platform frame 8 always maintains a stable attitude and does not deflect.

[0084] As Figures 1 to 10 shown, the present invention also provides a bearing test method for a single shear wall with a steel platform inner cylinder resting on a bracket. Using the bearing test frame for a single shear wall with a steel platform inner cylinder resting on a bracket according to any of the above embodiments, the method includes:

[0085] Step 1, test preparation: complete the integral casting of the single-piece shear wall 2 on the base plate 1 according to the structural design plan. Subsequent tests can be carried out only after the concrete structure of the shear wall 2 reaches the design strength; complete the construction of the reaction frame system, install the hydraulic cylinder 6 of the loading system on the lower end of the top balance beam 4 of the reaction frame system, install the axial force sensor 7 of the loading system on the lower end of the telescopic rod of the hydraulic cylinder 6 of the loading system, build the platform system on the base plate 1, and clamp the guide pulley 15 on the back of the L-shaped platform frame 8 of the platform system on the flange of the vertical steel column 5 of the reaction frame system, control the platform system's shelving corbel 9 to be in a retracted state through the corbel pushing cylinder 10 of the platform system, and control the hydraulic cylinder 6 to extend its telescopic rod through the control system so that the axial force sensor 7 at its lower end is firmly fixed to the portal bracket 13 of the platform system;

[0086] Step 2, lifting the platform frame 8: the control system controls the hydraulic cylinder 6 of the loading system to synchronously retract its telescopic rod, so that the L-shaped platform frame 8 is lifted as a whole to the height of the corbel pin housing 11 or the groove-shaped space of the shear wall 2;

[0087] Step 3, extending the shelf corbel 9: controlling the corbel pushing cylinder 10 of the platform system to extend the shelf corbel 9 from the corbel fixing boot 12 by a preset distance, and extending into the corbel pin housing 11 or the groove-shaped space on the shear wall 2 structure through the control system;

[0088] Step 4, vertical loading and deformation monitoring: the control system controls the hydraulic cylinder 6 of the loading system to apply a downward axial force to the platform system. The magnitude of the axial force is determined according to the actual load of the overall steel platform, and the rate of increase of the axial force and the loading time are determined according to the test design plan;

[0089] Step 5, test monitoring: in the process of applying the downward axial force, the magnitude of the downward axial force is monitored in real time by the axial force sensor 7, and the output axial force magnitude and posture of the hydraulic cylinder 6 are controlled accordingly, and at the same time, the deformation and damage of the concrete structure near the corbel pin housing 11 or the groove-shaped space on the shear wall 2 are monitored in real time;

[0090] Step 6, end of test: Continue to apply downward axial force according to the test plan. After achieving the purpose of this test, control the hydraulic cylinder 6 of the loading system through the control system to reduce the vertical axial force until the vertical contact force between the resting corbel 9 and the corbel pin housing 11 or the groove-shaped space is zero, and control the corbel pushing cylinder 10 to contract through the control system to retract the resting corbel 9 into the corbel fixing boot 12; control the hydraulic cylinder 6 to extend to lower the platform system onto the base plate 1 and form a stable contact, and release the fixation of the axial force sensor 7 and the platform system. The test ends here.

[0091] Specifically,Figures 1 to 10 As shown in the figure, the bearing test rig for the single shear wall with a corbel on the inner cylinder of the steel platform in this embodiment consists of a bottom plate 1, a shear wall 2, a reaction frame, a platform system, a loading system, and a control system.

[0092] The bottom plate 1 in this embodiment is a rectangular reinforced concrete structural plate member with a length of 10 m and a width of 7.5 m.

[0093] The shear wall 2 in this embodiment is a core tube shear wall structure of a super high-rise building cast in-situ integrally with a thickness of 0.6 m and a height of 3.5 m. The structural form of the shear wall 2 is a cast-in-place reinforced concrete structure. Two shear walls 2 with the same specifications are located at the eccentric position on the upper part of the bottom plate 1. A corbel pin housing 11 with a height of 1.3 m is arranged on the side of the shear wall 2.

[0094] The reaction frame in this embodiment consists of a bottom balance beam 3, a top balance beam 4, and vertical steel columns 5. The bottom balance beam 3 is composed of two H-shaped steel members with a length of 7.4 m, and the bottom balance beam 3 is buried in the bottom plate 1. The top balance beam 4 is a frame formed by welding an H-shaped steel main beam with a root length of 7.4 m and four H-shaped steel inclined beams with a length of 2.2 m. The vertical steel columns 5 are four H-shaped steel members with a height of 4.8 m, which are arranged vertically on the bottom plate 1.

[0095] The platform system in this embodiment consists of a platform frame 8, a corbel 9, a corbel jacking oil cylinder 10, and a corbel fixing boot 12. The L-shaped platform frame 8 has a length of 1.6 m, a width of 1.4 m, and a height of 1.6 m. The shapes of the corbel 9, the corbel jacking oil cylinder 10, the corbel pin housing 11, and the corbel fixing boot 12 are as Figure 6 shown. The protruding distance of the corbel 9 is 0.25 m, and the overlapping length with the corbel pin housing 11 is 0.13 m, which can provide a stable support.

[0096] The loading system in this embodiment consists of hydraulic cylinders 6 and axial force sensors 7. The maximum axial force that two hydraulic cylinders 6 can provide is 150 t, and the maximum total vertical force that can be provided is 600 t. The loading capacity is greater than the actual maximum gravity load of the overall steel platform.

[0097] The corbel pin housing 11 is left on the shear wall 2. During the test, the corbel 9 is placed on the corbel pin housing 11, and the vertical load of the corbel 9 is indirectly transmitted to the shear wall 2 structure through the corbel pin housing 11.

[0098] This embodiment is mainly used for the bearing local strength test of the reinforced concrete shear wall structure of the core tube of a super high-rise building. The test method includes six steps:

[0099] Step 1. Test preparation: Complete the integral casting of the shear wall 2 on the bottom plate 1 according to the structural design plan. After the concrete structure strength reaches 70% of the design strength, carry out the subsequent tests; complete the construction of the reaction frame, and firmly lap the platform system and the loading system.

[0100] Step 2. Lifting of the platform frame 8: Control the two hydraulic cylinders 6 to synchronously contract their telescopic rods through the control system, so that the overall platform frame 8 is lifted by 1.3 m to the height of the bracket pin housing 11.

[0101] Step 3. Extension of the supporting bracket 9: Control the bracket pushing cylinder 10 to extend through the control system to push the supporting bracket 9 to extend 0.25 m from the bracket fixing boot 12 and extend into the bracket pin housing 11 on the shear wall 2 structure, and the overlapping depth of the two is 0.13 m.

[0102] Step 4. Vertical loading and deformation monitoring: Control the two hydraulic cylinders 6 of the loading system to apply a downward axial force to the platform system through the control system. The magnitude of the axial force is 50 t, and the total vertical load is 200 t, simulating the vertical load transmitted by the overall steel platform system to the supporting bracket 9 under normal use conditions. The increasing rate of the axial force is 5 t / min.

[0103] Step 5. Test monitoring: While applying the vertical load, monitor the magnitude of the vertical axial force in real time through the axial force sensor 7, and at the same time use a high-definition camera and an image analysis system to monitor the concrete structure deformation and damage conditions near the bracket pin housing 11 on the shear wall 2 in real time.

[0104] Step 6. End of the test: After continuously loading for 6 h according to the test plan, control the two hydraulic cylinders 6 of the loading system to reduce the vertical force axial force until the vertical contact force between the supporting bracket 9 and the bracket pin housing 11 is zero. Control the bracket pushing cylinder 10 to contract to retract the supporting bracket 9 into the bracket fixing boot 12; control the hydraulic cylinder 6 to extend to lower the platform system to the bottom plate 1 and form a stable contact, and loosen the fixation of the axial force sensor 7 and the platform system. Thus, the test ends.

[0105] Combined with the description of this embodiment and Figures 1 to 10 , the scientific and technical personnel in this field can complete the construction of this test stand device and successfully implement the local bearing test.

[0106] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0107] 1. It can reproduce the real loading conditions: The platform system of the present invention is exactly the same as the bottom platform beam of the overall steel platform. The vertical load provided by the loading system can be exactly the same as the gravity load of the overall steel platform. Therefore, the present invention can locally reproduce the formal loading conditions of the overall steel platform system.

[0108] 2. Strong test capabilities and a large amount of monitoring data: The loading system of the test rack device proposed in the present invention can apply a vertical force greater than the actual gravity load of the steel platform, and can test the ultimate bearing capacity of the structure of the supporting corbel 9 and the local compression of the shear wall 2. It can apply uneven loads and can repeat the application of loads, and can test the vertical load combination under complex working conditions, with powerful test capabilities; the loading system of the test rack device proposed in the present invention can be equipped with a variety of sensors, which can measure the deformation and stress of the platform frame 8, the supporting corbel 9, the corbel fixing boot 12, etc., and can also monitor the local deformation and failure conditions of the shear wall 2 under the action of the load.

[0109] 3. Convenient for repeated use: The loading system of the test rack device proposed in the present invention can be reused. After one test is completed, the structure of the shear wall 2 is removed, and a new shear wall 2 structure can be re-poured according to different design schemes, so that the local bearing capacity and failure form of the shear wall 2 structures of different structural forms can be tested.

[0110] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0111] Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A bearing test stand for a single shear wall with a corbel for placing the inner cylinder of a steel platform, characterized in that, Comprising: Base plate (1); A single-piece shear wall (2) fixed to the base plate (1); A reaction force frame system connected to the base plate (1), with the shear wall (2) located within the space enclosed by the reaction force frame system; A platform system, with a supporting bracket (9) extending from one side of the platform system, and the supporting bracket (9) is mounted on the shear wall (2); A loading system, with the bottom end of the loading system connected to the platform system and the top end of the loading system connected to the reaction force frame system, and the loading system is used to apply a downward axial force to the platform system; A control system respectively connected to the loading system and the platform system, for respectively controlling the telescoping of the supporting bracket (9) and the loading system; A bracket pin housing (11) or a groove-shaped space formed by the bracket pin housing (11) is provided on the shear wall (2), and the supporting bracket (9) extends into the bracket pin housing (11) or the groove-shaped space; wherein, the bracket pin housing (11) is installed together with the formwork before the pouring of the shear wall (2), and serves as a mold during the overall concrete pouring construction of the shear wall (2). After the overall pouring of the shear wall (2) is completed and the concrete forms strength, first the formwork is removed, and the bracket pin housing (11) is left on the shear wall (2), or the bracket pin housing (11) is removed to form a groove-shaped space on the shear wall (2) for the supporting bracket (9) to extend into; wherein, if the bracket pin housing (11) is left on the shear wall (2), the supporting bracket (9) is placed on the bracket pin housing (11), and the vertical load of the supporting bracket (9) is indirectly transmitted to the shear wall (2) structure through the bracket pin housing (11); if the bracket pin housing (11) is not left on the shear wall 2, the supporting bracket (9) is directly placed on the groove-shaped space of the shear wall (2), and the vertical load of the supporting bracket (9) is directly transmitted to the shear wall (2) structure; The reaction force frame system includes: Two bottom balance beams (3) embedded in the base plate (1); Two top balance beams (4); Four vertical steel columns (5) with a height higher than the shear wall (2), with the lower end of each vertical steel column (5) connected to a bottom balance beam (3) and the upper end of each vertical steel column (5) connected to a top balance beam (4). The vertical steel columns (5) are arranged outside the structure of the shear wall (2), and the shear wall (2) is located at an eccentric position between two groups of vertical steel columns (5); The platform system includes: An L-shaped platform frame (8), which is a rectangular frame composed of multiple H-shaped steel platform beams. The platform vertical frame (14) is the vertical part of the L-shaped platform frame (8) and forms an angle of 90° with the horizontal part of the L-shaped platform frame (8); A supporting bracket (9), which is a telescopic steel member; A bracket jacking oil cylinder (10), which is a horizontally telescopic actuating device, and the rear end of the supporting bracket (9) is connected to the bracket jacking oil cylinder (10); The corbel fixing boot (12) is a boot-shaped steel member with a hole in the middle, fixed on the horizontal part of the L-shaped platform frame (8). The corbel (9) to be placed passes through the hole in the middle of the corbel fixing boot (12). The corbel fixing boot (12) fixes the degrees of freedom of the corbel (9) to be placed in the left and right directions, so that the corbel (9) to be placed only makes telescopic movements in the front and back directions under the action of the corbel pushing oil cylinder (10). A gantry bracket (13) installed in the middle of the L-shaped platform frame (8). The gantry bracket (13) is a gantry-shaped steel member. The gantry bracket (13) is connected to the loading system. The open space under the gantry bracket (13) is used to place the corbel pushing oil cylinder (10). The guide pulley (15) is a slidable member equipped with two pairs of roller sets, a total of four. The guide pulley (15) is fixed on the outside of the platform vertical frame (14). The guide pulley (15) grasps both sides of the flange of the vertical steel column (5) and slides up and down along the vertical steel column (5).

2. The bearing test stand for a single shear wall with a steel platform inner cylinder resting bracket as described in claim 1, characterized in that, The loading system includes: A hydraulic cylinder (6) which is a vertical actuating device. The rear end of the hydraulic cylinder (6) is fixed to the lower end of the top balance beam (4). An axial force sensor (7) which is a sensor for monitoring the output axial force of the hydraulic cylinder (6). The front end of the telescopic rod of the hydraulic cylinder (6) is fixedly connected to the axial force sensor (7). The axial force sensor (7) is connected to the gantry bracket (13).

3. The steel platform inner cylinder resting bracket single shear wall pressure-bearing test stand according to claim 2, characterized in that, The control system is used to control the axial force magnitude and telescopic attitude of the hydraulic cylinder (6) and the corbel pushing oil cylinder (10), and to monitor the axial force data of the axial force sensor (7).

4. The bearing test stand for single shear wall with a corbel supported by the inner cylinder of the steel platform as described in claim 3, characterized in that, The control system controls the hydraulic cylinder (6) to provide a vertical force, which is transmitted to the platform frame (8) through the axial force sensor (7). The corbel fixing boot (12) fixed on the L-shaped platform frame (8) then transmits the vertical force to the corbel (9) to be placed. The corbel (9) to be placed contacts the corbel pin housing (11) or the groove-shaped space, and finally transmits the downward axial force provided by the hydraulic cylinder (6) to the shear wall (2) structure.

5. A method for testing the bearing capacity of a single shear wall with a corbel placed in a steel platform inner cylinder. The method uses the steel platform inner cylinder corbel single shear wall bearing capacity test frame according to any one of claims 1 to 4. The method includes: Step 1: Complete the integral casting of the single-piece shear wall (2) on the base plate (1) according to the structural design plan, complete the construction of the reaction frame system, install the hydraulic cylinder (6) of the loading system on the lower end of the top balance beam (4) of the reaction frame system, install the axial force sensor (7) of the loading system on the lower end of the telescopic rod of the hydraulic cylinder (6) of the loading system, build the platform system on the base plate (1), and clamp the guide pulley (15) on the back of the L-shaped platform frame (8) of the platform system on the flange of the vertical steel column (5) of the reaction frame system. The platform system's shelving corbel (9) is controlled to be in a retracted state by the corbel pushing cylinder (10) of the platform system, and the hydraulic cylinder (6) is controlled to extend its telescopic rod by the control system so that the axial force sensor (7) at its lower end is firmly fixed to the portal bracket (13) of the platform system; Step 2: Control the hydraulic cylinder (6) of the loading system through the control system to synchronously retract its telescopic rod, so that the L-shaped platform frame (8) is lifted as a whole to the height of the corbel pin housing (11) or the groove-shaped space of the shear wall (2); Step 3, controlling the corbel pushing cylinder (10) of the platform system through the control system to extend the corbel (9) out of the corbel fixing boot (12) by a preset distance and extend into the corbel pin housing (11) or the groove-shaped space on the shear wall (2); Step 4: Controlling the hydraulic cylinder (6) of the loading system to apply a downward axial force to the platform system through the control system; Step 5: During the process of applying the downward axial force, the magnitude of the downward axial force is monitored in real time by the axial force sensor (7), and the output axial force magnitude and posture of the hydraulic cylinder (6) are controlled thereby, and at the same time, the deformation and damage of the concrete structure near the corbel pin housing (11) or the groove-shaped space on the shear wall (2) are monitored in real time; Step 6: Continue to apply downward axial force according to the test plan. After achieving the purpose of this test, the control system controls the hydraulic cylinder (6) of the loading system to reduce the vertical axial force until the vertical contact force between the resting corbel (9) and the corbel pin housing (11) or the groove-shaped space is zero. The control system controls the corbel pushing cylinder (10) to contract so as to retract the resting corbel (9) into the corbel fixing boot (12); the hydraulic cylinder (6) is controlled to extend so as to lower the platform system onto the base plate (1) and form a stable contact, and the fixation between the axial force sensor (7) and the platform system is released. The test ends here.

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