Steel platform inner cylinder supporting bracket single-row pressure-bearing test stand and test method

Abstract

The present invention provides a single-row test rack with a bearing bracket for the inner cylinder of a steel platform and a test method. The present invention includes a bottom plate, shear walls, 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 single-row test rack for bearing of the supporting bracket of the inner cylinder of a steel platform and a test method thereof. Background Art

[0002] The construction technology of super high-rise buildings in China leads the world. The height of the completed Shanghai Tower reaches 632m, which is the second tallest building in the world. Among the top ten tallest buildings in the world, half of them are in China. At present, 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, etc. 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 generally recognized in the construction engineering field of 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 has formed a relatively complete technical system. 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 a super high-rise building, the overall steel platform is generally lifted as a whole by the method of staged jacking or staged hoisting. During the core tube concrete pouring construction stage, the overall steel platform and all the construction loads on it are transmitted to the core tube concrete structure through the supporting bracket system at the bottom of the inner cylinder scaffold of the steel platform. 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 supporting bracket position. In addition, there are also potential safety hazards in the local structure of the core tube concrete in contact with the supporting bracket for force transmission. At present, the research on the bearing capacity and failure mode of the supporting bracket and the local bearing position of the concrete has not been fully carried out, and there are no mature test research methods and theoretical research results. Therefore, it is urgent 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 of super high-rise buildings, which can systematically study the local bearing structural characteristics of the supporting bracket of the overall steel platform system and the core tube concrete structure of super high-rise buildings. Summary of the Invention

[0004] The purpose of the present invention is to provide a single-row test rack for bearing of the supporting bracket of the inner cylinder of a steel platform and a test method thereof.

[0005] To solve the above problems, the present invention provides a single-row test rack for bearing of the supporting bracket of the inner cylinder of a steel platform, including:

[0006] Bottom plate 1;

[0007] Shear walls 2 which are fixed on the bottom plate 1 and are arranged opposite to each other and at a preset distance apart;

[0008] Reaction frame system connected to the bottom plate 1;

[0009] A platform system, which is located between the shear walls 2. A single-row structure is formed by one supporting corbel 9 extending out respectively on both sides of the platform system, and the supporting corbels 9 are respectively erected on the shear walls 2;

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

[0011] A control system, which is connected to the loading system and the platform system respectively, and is used to control the expansion and contraction of the supporting corbel 9 and the loading system respectively.

[0012] Further, in the above-mentioned single-row test stand for bearing pressure of the steel platform inner cylinder supporting corbel, a corbel pin housing 11 with the same height or a groove-shaped space formed by the corbel pin housing 11 is respectively provided on each shear wall 2, and the supporting corbel 9 extends into the corbel pin housing 11 or the groove-shaped space.

[0013] Further, in the above-mentioned single-row test stand for bearing pressure of the steel platform inner cylinder supporting corbel, the reaction frame system includes:

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

[0015] A top balance beam 4;

[0016] Four vertical steel columns 5 with a height higher than that of 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 the top balance beam 4.

[0017] Further, in the above-mentioned single-row test stand for bearing pressure of the steel platform inner cylinder supporting corbel, the platform system includes:

[0018] A platform frame 8, which is a rectangular frame composed of multiple H-shaped steel platform beams;

[0019] A supporting corbel 9, which is a retractable steel member;

[0020] A corbel jacking oil cylinder 10, which is a horizontally retractable actuating device, and the rear end of the supporting corbel 9 is connected to the corbel jacking oil cylinder 10;

[0021] A corbel fixing boot 12, which is a boot-shaped steel member with a hole in the middle, is fixed at the side position of the platform frame 8. The supporting corbel 9 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 supporting corbel 9 in the left and right directions, so that the supporting corbel 9 only makes telescopic movement in the front and rear directions under the action of the corbel jacking oil cylinder 10;

[0022] Two gantry brackets 13 are installed in the middle of the platform frame 8. The gantry bracket 13 is a gantry-shaped steel member, and the gantry bracket 13 is connected to the loading system. The open space under the gantry bracket 13 is used to place the bracket jacking oil cylinder 10.

[0023] Further, in the above-mentioned steel platform inner cylinder placing bracket bearing single-row test stand, the loading system includes:

[0024] Two hydraulic cylinders 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;

[0025] Two axial force sensors 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 one hydraulic cylinder 6 is fixedly connected to a corresponding axial force sensor 7, and the axial force sensor 7 is connected to a corresponding gantry bracket 13.

[0026] Further, in the above-mentioned steel platform inner cylinder placing bracket bearing single-row test stand, the control system is used to control the axial force magnitude and telescopic attitude of the hydraulic cylinder 6 and the bracket jacking oil cylinder 10, and to monitor the axial force data of the axial force sensor 7.

[0027] Further, in the above-mentioned steel platform inner cylinder placing bracket bearing single-row test stand, 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 platform frame 8 then transmits the vertical force to the placed bracket 9. The placed 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.

[0028] Further, in the above-mentioned steel platform inner cylinder placing bracket bearing single-row test stand, the vertical steel column 5 is arranged inside the shear wall 2 structure. The lower half of the vertical steel column 5 is buried in the shear wall 2, and the lengths of the bottom balance beam 3 and the top balance beam 4 are the same as the distance between the two shear walls 2.

[0029] Further, in the above-mentioned steel platform inner cylinder placing bracket bearing single-row test stand, the vertical steel column 5 is arranged outside the shear wall 2 structure. The lengths of the bottom balance beam 3 and the top balance beam 4 are greater than the distance between the two shear walls 2, and the shear wall 2 is placed inside the space surrounded by the bottom balance beam 3, the vertical steel column 5 and the top balance beam 4.

[0030] According to another aspect of the present invention, there is also provided a method for testing a single row of brackets bearing pressure on the inner cylinder of a steel platform, characterized in that the above-mentioned steel platform inner cylinder placing bracket bearing single-row test stand is adopted, and the method includes:

[0031] Step 1: Complete the integral casting of two shear walls 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, 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;

[0032] Step 2: Control the two hydraulic cylinders 6 of the loading system to synchronously retract their telescopic rods through the control system, so that the 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;

[0033] Step 3, controlling 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 structure;

[0034] Step 4: Control the two hydraulic cylinders 6 of the loading system through the control system to apply a downward axial force to the platform system;

[0035] 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;

[0036] Step six, continue to apply downward axial force according to the test plan. After achieving the purpose of this test, control the two hydraulic cylinders 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.

[0037] 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the single-row test stand for the bearing pressure of the inner cylinder's resting bracket on the steel platform according to an embodiment of the present invention;

[0039] Figure 2 Front view of the single-row test stand for the bearing pressure of the inner cylinder's resting bracket on the steel platform according to an embodiment of the present invention;

[0040] Figure 3 Top view of the single-row test stand for the bearing pressure of the inner cylinder's resting bracket on the steel platform according to an embodiment of the present invention;

[0041] Figure 4 Installation schematic diagram of the reaction frame of the single-row test stand for the bearing pressure of the inner cylinder's resting bracket on the steel platform according to an embodiment of the present invention;

[0042] Figure 5 Schematic diagram of the resting bracket 9 extending into the bracket pin housing 11 of the single-row test stand for the bearing pressure of the inner cylinder's resting bracket on the steel platform according to an embodiment of the present invention;

[0043] Figure 6 Disassembly schematic diagram of the resting bracket system of the single-row test stand for the bearing pressure of the inner cylinder's resting bracket on the steel platform according to an embodiment of the present invention;

[0044] Figure 7 Schematic diagram of the bottom platform frame 8 of the single-row test stand for the bearing pressure of the inner cylinder's resting bracket on the steel platform according to an embodiment of the present invention being placed on the bottom plate 1;

[0045] Figure 8 Schematic diagram of the bottom platform frame 8 of the single-row test stand for the bearing pressure of the inner cylinder's resting bracket on the steel platform according to an embodiment of the present invention being lifted to the test position;

[0046] Figure 9 Schematic diagram of the vertical steel column 5 being arranged outside the shear wall 2;

[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 - resting bracket; 10 - bracket jacking oil cylinder; 11 - bracket pin housing; 12 - bracket fixing boot; 13 - gantry support. Detailed implementation manners

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

[0049] As Figures 1 to 9 shown, the present invention provides a single-row test stand for the bearing pressure of the inner cylinder's resting bracket on the steel platform, including:

[0050] Bottom plate 1;

[0051] Shear walls 2 fixedly arranged on the bottom plate 1, opposite to each other and spaced apart by a preset distance.

[0052] A reaction frame system connected to the bottom plate 1.

[0053] A platform system located between the shear walls 2. On both sides of the platform system, a single row structure is formed by a shelf bracket 9 extending out respectively, and the shelf brackets 9 are respectively mounted on the shear walls 2.

[0054] A loading system, the bottom end of which is connected to the platform system, and the top end of which is connected to the reaction frame system. 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, used to control the expansion and contraction of the shelf bracket 9 and the loading system respectively.

[0056] Here, the bottom plate 1 is a rectangular reinforced concrete structural plate member, and a bottom balance beam 3 is buried inside the bottom plate 1. The bottom plate 1 and the shear wall 2 are integrated, playing a role in supporting the shear wall 2 and providing a stable support for the entire test stand.

[0057] The present invention fills the blank of the existing test technology for the safety assessment problem of the support system of the overall steel platform construction technology of super high-rise buildings, and provides a single-row bearing pressure test stand for the inner tube shelf bracket of the steel platform and its test method.

[0058] The present invention includes a bottom plate 1, shear walls 2, a reaction frame system, a platform system, a loading system and a control system, and can be used for the bearing partial 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.

[0059] The present invention includes a bottom plate 1, shear walls 2, a reaction frame system, a platform system, a loading system and a control system.

[0060] As Figures 1 to 9 shown, in an embodiment of the single-row bearing pressure test stand for the inner tube shelf bracket of the steel platform of the present invention, each shear wall 2 is respectively provided with a bracket pin housing 11 of the same height or a groove-shaped space formed by the bracket pin housing 11, and the shelf bracket 9 extends into the bracket pin housing 11 or the groove-shaped space.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] The shear wall 2 is a core tube shear wall structure of a super high-rise building cast in situ as a whole. The corbel pin housing 11 is provided thereon. The structural form of the shear wall 2 is determined according to the core tube structure design scheme, and it can be a reinforced concrete structure cast in situ as a whole or a steel reinforced concrete structure cast in situ as a whole. Two shear walls 2 with the same specifications are located on both sides of the upper part of the floor slab 1. The distance between the two shear walls 2 is determined according to the super high-rise building design scheme. Two corbel pin housings 11 with the same height are arranged on the inner sides of the two shear walls 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.

[0065] As Figures 1 to 9 shown, in an embodiment of the steel platform inner tube corbel bearing single-row test stand of the present invention, the reaction frame system includes:

[0066] Two bottom balance beams 3 buried in the floor slab 1;

[0067] The top balance beam 4;

[0068] Four vertical steel columns 5 with a height higher than that of 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 the top balance beam 4.

[0069] Here, the reaction force frame system 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 one H - shaped steel main beam and four H - shaped steel inclined beams, which is horizontally placed above the entire device, and the top balance beam 4 has the same length as the bottom balance beam 3. The vertical steel columns 5 are composed of four H - shaped steel members, which are vertically arranged 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.

[0070] As Figures 1 to 9 shown, in an embodiment of the steel platform inner cylinder supporting bracket pressure - bearing single - row test stand of the present invention, the platform system includes:

[0071] A platform frame 8, and the platform frame 8 is a rectangular frame composed of multiple H - shaped steel platform beams;

[0072] A supporting bracket 9, and the supporting bracket 9 is a retractable steel member;

[0073] A bracket jacking oil cylinder 10, and the bracket jacking oil cylinder 10 is a horizontally retractable actuating device, and the rear end of the supporting bracket 9 is connected to the bracket jacking oil cylinder 10;

[0074] A bracket fixing boot 12, and the bracket fixing boot 12 is a boot - shaped steel member with a hole in the middle, which is fixed at the side position of the 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 - right two directions, so that the supporting bracket 9 only makes telescopic movements in the front - rear two directions under the action of the bracket jacking oil cylinder 10;

[0075] Two gantry brackets 13 installed in the middle of the platform frame 8, and the gantry brackets 13 are gantry - shaped steel members. The gantry brackets 13 are connected to the loading system, and the open space under the gantry brackets 13 is used to place the bracket jacking oil cylinder 10.

[0076] Here, the platform system includes a platform frame 8, a supporting bracket 9, a bracket pushing oil cylinder 10, a bracket fixing boot 12, and a portal frame 13. The platform frame 8 is a rectangular frame composed of multiple H-shaped steel platform beams. The supporting bracket 9 is a telescopic steel member. The bracket pushing oil cylinder 10 is a horizontally telescopic actuator. 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 at the side position of the 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 it to only telescopically move in the front and rear directions 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. Two portal frames 13 are installed in the middle of the platform frame 8 and are used to connect the axial force sensor 7. The vertical load provided by the hydraulic cylinder 6 is transmitted to the platform frame 8 through the portal frame 13.

[0077] As Figures 1 to 9 shown, in an embodiment of the steel platform inner cylinder supporting bracket bearing single-row test stand of the present invention, the loading system includes:

[0078] Two hydraulic cylinders 6. The hydraulic cylinder 6 is a vertical actuator, and the rear end of the hydraulic cylinder 6 is fixed to the lower end of the top balance beam 4.

[0079] Two axial force sensors 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 one hydraulic cylinder 6 is fixedly connected to the corresponding axial force sensor 7, and the axial force sensor 7 is connected to the corresponding portal frame 13.

[0080] Here, the loading system consists of the hydraulic cylinder 6 and the axial force sensor 7. The hydraulic cylinder 6 is an accurately controllable vertical actuator, having a vertical telescopic degree of freedom and capable of providing a downward axial force. There are two in total. 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 the axial force sensor 7 connects the telescopic rod of the hydraulic cylinder 6 and the portal frame 13

[0081] As Figures 1 to 9 shown, in an embodiment of the steel platform inner cylinder supporting bracket bearing single-row test stand of the present invention, the control system is used to control the axial force magnitude and telescopic attitude 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.

[0082] Here, 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. The control system can also monitor the axial force data monitored by the axial force sensor 7.

[0083] As Figures 1 to 9 shown, in an embodiment of the steel platform inner cylinder resting bracket bearing single-row test stand of the present invention, 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 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.

[0084] As Figures 1 to 8 shown, in an embodiment of the steel platform inner cylinder resting bracket bearing single-row test stand of the present invention, the vertical steel column 5 is arranged inside the shear wall 2 structure. The lower half of the vertical steel column 5 is buried in the shear wall 2, and the lengths of the bottom balance beam 3 and the top balance beam 4 are the same as the distance between the two shear walls 2.

[0085] Here, if the vertical steel column 5 is arranged inside the shear wall 2 structure, the lower half of the vertical steel column 5 is buried in the shear wall 2, and the lengths of the bottom balance beam 3 and the top balance beam 4 are the same as the distance between the two shear walls 2.

[0086] As Figure 9 shown, in an embodiment of the steel platform inner cylinder resting bracket bearing single-row test stand of the present invention, the vertical steel column 5 is arranged outside the shear wall 2 structure. The lengths of the bottom balance beam 3 and the top balance beam 4 are greater than the distance between the two shear walls 2, and the shear wall 2 is placed inside the space enclosed by the bottom balance beam 3, the vertical steel column 5 and the top balance beam 4.

[0087] Here, if the vertical steel column 5 is arranged outside the shear wall 2 structure, the bottom of the vertical steel column 5 is buried in the floor slab 1, the shear wall 2 structure is separated from the vertical steel column 5, the lengths of the bottom balance beam 3 and the top balance beam 4 are greater than the distance between the two shear walls 2, and the shear wall 2 is placed inside it.

[0088] The present invention also provides a method for testing the bearing capacity of a single row of brackets resting on the inner cylinder of a steel platform. Using the steel platform inner cylinder resting bracket bearing single-row test stand described in any one of the above, the method includes:

[0089] Step 1, test preparation: complete the integral casting of two shear walls 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, 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;

[0090] Step 2, lifting the platform frame 8: the control system controls the two hydraulic cylinders 6 of the loading system to synchronously retract their telescopic rods, so that the 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;

[0091] 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;

[0092] Step 4, vertical loading and deformation monitoring: The control system controls the two hydraulic cylinders 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;

[0093] 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;

[0094] Step 6, end of test: Continue to apply downward axial force according to the test plan. After achieving the purpose of this test, the control system controls the two hydraulic cylinders 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 space is zero, and the control system controls the corbel pushing cylinder 10 to contract to retract the resting corbel 9 into the corbel fixing boot 12; the hydraulic cylinder 6 is controlled to extend to lower the platform system onto the base plate 1 and form a stable contact, and the fixation of the axial force sensor 7 and the platform system is released, and the test ends here.

[0095] Specifically, Figures 1 to 9As shown in the figure, the single-row bearing test stand for the steel platform inner cylinder bracket in this embodiment consists of a bottom plate 1, shear walls 2, a reaction frame, a platform system, a loading system, and a control system.

[0096] 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.

[0097] The shear wall 2 in this embodiment is a core wall shear wall structure of a super high-rise building with a thickness of 0.6 m and a height of 3.5 m, which is integrally cast in place. The structural form of the shear wall 2 is an integrally cast reinforced concrete structure. Two shear walls 2 with the same specifications are symmetrically arranged on both sides of the upper part of the bottom plate 1, and the distance between the two shear walls 2 is 6.2 m. Two bracket pins 11 with a height of 1.3 m are arranged inside the two shear walls 2.

[0098] 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 a main H-shaped steel beam with a 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 vertically arranged on the bottom plate 1.

[0099] The platform system in this embodiment consists of a platform frame 8, a supporting bracket 9, a bracket jacking oil cylinder 10, and a bracket fixing boot 12. The platform frame 8 is a rectangular frame with a length of 5.8 m and a width of 1.4 m composed of multiple H-shaped steel platform beams. The shapes of the supporting bracket 9, the bracket jacking oil cylinder 10, the bracket pin 11, and the bracket fixing boot 12 are as Figure 6 shown. The protruding distance of the supporting bracket 9 is 0.25 m, and the overlapping length with the bracket pin 11 is 0.13 m, which can provide a stable support.

[0100] The loading system in this embodiment consists of hydraulic cylinders 6 and axial force sensors 7. The maximum axial force that the 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.

[0101] The vertical steel columns 5 are arranged inside the shear wall 2 structure. The lower half of the vertical steel columns 5 is buried in the shear wall 2, and the lengths of the bottom balance beam 3 and the top balance beam 4 are the same as the distance between the two shear walls 2.

[0102] The bracket pin 11 is left on the shear wall 2. During the test, the supporting bracket 9 is placed on the bracket pin 11, and the vertical load of the supporting bracket 9 is indirectly transmitted to the shear wall 2 structure through the bracket pin 11.

[0103] 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:

[0104] Step 1. Test preparation: Complete the integral pouring of two shear walls 2 on the bottom plate 1 according to the structural design scheme. After the concrete structure strength reaches 70% of the design strength, carry out the subsequent test; complete the construction of the reaction frame and firmly lap the platform system and the loading system;

[0105] Step 2. Lifting of the platform frame 8: Control two hydraulic cylinders 6 to synchronously contract their telescopic rods through the control system, so that the platform frame 8 is integrally lifted by 1.3 m to the height of the bracket pin housing 11;

[0106] 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 lapping depth of the two is 0.13 m;

[0107] Step 4. Vertical loading and deformation monitoring: Control 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. Simulate the vertical load transmitted by the overall steel platform system to the supporting bracket 9 under normal use conditions, and the increasing rate of the axial force is 5 t / min;

[0108] Step 5. Test monitoring: While applying the vertical load, monitor the magnitude of the downward 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 failure conditions near the bracket pin housing 11 on the shear wall 2 in real time;

[0109] Step 6. End of the test: After continuously loading for 6 h according to the test scheme, control 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.

[0110] Combined with the description of this embodiment and Figures 1 - 8 , the scientific research and technical personnel in this field can complete the construction of the test rack device and successfully implement the local bearing test.

[0111] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0112] 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 integral steel platform. The vertical load provided by the loading system can be exactly the same as the gravity load of the integral steel platform. Therefore, the present invention can locally reproduce the formal loading conditions of the integral steel platform system.

[0113] 2. Strong test ability and a large amount of monitoring data: The loading system of the test rack device proposed by the present invention can apply a vertical force greater than the actual gravity load of the steel platform, can test the ultimate bearing capacity of the structure of the supporting bracket 9 and the local bearing of the shear wall 2, can apply uneven loads and can repeat the application of loads, and can test the vertical load combination under complex working conditions, with a strong test ability; The loading system of the test rack device proposed by the present invention can be equipped with a variety of sensors, can measure the deformation and stress of the platform frame 8, the supporting bracket 9, the bracket fixing boot 12, etc., and can also monitor the local deformation and damage of the shear wall 2 under the action of the load.

[0114] 3. Convenient for repeated use: The loading system of the test rack device proposed by 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-cast according to different design schemes, so that the local bearing capacity and failure form of shear wall 2 structures of different structural forms can be tested.

[0115] 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.

[0116] 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 is also intended to include these changes and modifications.

Claims

1. A single-row test stand for the bearing of a bracket placed on the inner cylinder of a steel platform, characterized in that, Comprising: Base plate (1); Shear walls (2) fixed on the base plate (1), opposite to each other and spaced apart by a preset distance; Reaction frame system connected to the base plate (1); Platform system, the platform system is located between the shear walls (2), and a single-row structure is formed by a supporting bracket (9) extending out respectively on both sides of the platform system, and the supporting brackets (9) are respectively erected on the shear walls (2); 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; 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) with the same height or a groove-shaped space formed by the bracket pin housing (11) is respectively provided on each shear wall (2), and the supporting bracket (9) extends into the bracket pin housing (11) or the groove-shaped space; The reaction frame system includes: Two bottom balance beams (3) buried in the base plate (1); Top balance beam (4); Four vertical steel columns (5) with a height higher than the shear walls (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 the top balance beam (4); The platform system includes: Platform frame (8), the platform frame (8) is a rectangular frame composed of multiple H-shaped steel platform beams; Supporting bracket (9), the supporting bracket (9) is a telescopic steel member; Bracket jacking oil cylinder (10), the bracket jacking oil cylinder (10) is a horizontally telescopic actuator, and the rear end of the supporting bracket (9) is connected to the bracket jacking oil cylinder (10); Bracket fixing boot (12), the bracket fixing boot (12) is a boot-shaped steel member with a hole in the middle, fixed at the side position of the platform frame (8), the supporting bracket (9) passes through the hole in the middle of the bracket fixing boot (12), and 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 movement in the front and rear directions under the action of the bracket jacking oil cylinder (10); Two gantry brackets (13) installed in the middle of the platform frame (8), the gantry brackets (13) are gantry-shaped steel members, the gantry brackets (13) are connected to the loading system, and the open space under the gantry brackets (13) is used to place the bracket jacking oil cylinder (10); The vertical steel columns (5) are arranged outside the shear wall (2) structure, and the lengths of the bottom balance beam (3) and the top balance beam (4) are greater than the spacing between the two shear walls (2), and the shear wall (2) is placed inside the space surrounded by the bottom balance beam (3), the vertical steel columns (5) and the top balance beam (4).

2. The single-row test stand with a bearing bracket for the inner cylinder of the steel platform as described in claim 1, characterized in that, The loading system includes: Two hydraulic cylinders (6), the hydraulic cylinders (6) are vertical actuators, and the rear ends of the hydraulic cylinders (6) are fixed to the lower end of the top balance beam (4); Two axial force sensors (7), the axial force sensor (7) being a sensor for monitoring the output axial force of the hydraulic cylinder (6). The front end of the telescopic rod of one hydraulic cylinder (6) is fixedly connected to a corresponding axial force sensor (7), and the axial force sensor (7) is connected to a corresponding gantry bracket (13).

3. The steel platform inner cylinder resting bracket bearing single-row 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 jacking cylinder (10), and to monitor the axial force data of the axial force sensor (7).

4. The single-row test stand with a bearing bracket for 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 platform frame (8) then transmits the vertical force to the corbel (9). The corbel (9) 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. The single-row test stand with a bearing bracket for the inner cylinder of the steel platform as described in claim 4, wherein, The vertical steel column (5) is arranged inside the shear wall (2) structure. The lower half of the vertical steel column (5) is buried in the shear wall (2), and the lengths of the bottom balance beam (3) and the top balance beam (4) are the same as the distance between the two shear walls (2).

6. A single-row test method for the bearing of a corbel placed on the inner cylinder of a steel platform, characterized in that, Adopt the steel platform inner cylinder corbel bearing single-row test stand according to any one of claims 1 to 5, and the method includes: Step 1: Complete the overall pouring of two shear walls (2) on the bottom plate (1) according to the structural design scheme; complete the construction of the reaction frame system, install the hydraulic cylinder (6) of the loading system at the lower end of the top balance beam (4) of the reaction frame system, install the axial force sensor (7) of the loading system at the lower end of the telescopic rod of the hydraulic cylinder (6) of the loading system, build the platform system on the bottom plate (1), control the corbel (9) of the platform system to be in the retracted state through the corbel jacking 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 gantry bracket (13) of the platform system. Step 2: Control the two hydraulic cylinders (6) of the loading system to synchronously contract their telescopic rods through the control system, so that the platform frame (8) is integrally lifted to the height of the corbel pin housing (11) or the groove-shaped space of the shear wall (2). Step 3: Control the corbel jacking cylinder (10) of the platform system to extend and push the corbel (9) to extend a preset distance from the corbel fixing boot (12) through the control system, and extend it into the corbel pin housing (11) or the groove-shaped space on the shear wall (2) structure. Step 4: Control the two hydraulic cylinders (6) of the loading system to apply a downward axial force to the platform system through the control system. Step 5: During the application of the downward axial force, real-time monitor the magnitude of the downward axial force through the axial force sensor (7), and control the output axial force magnitude and attitude of the hydraulic cylinder (6) accordingly. At the same time, real-time monitor the deformation and damage conditions of the concrete structure near the corbel pin housing (11) or the groove-shaped space on the shear wall (2). 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 two hydraulic cylinders (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 of the axial force sensor (7) and the platform system is released. The test ends here.

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