Double-row test rack for bearing pressure of inner cylinder support bracket in steel platform and its test method

Abstract

The present invention provides a double-row test stand with a bearing bracket for the inner cylinder of a steel platform and a test method thereof, which includes a bottom plate, shear walls, a reaction frame system, a platform system, a loading system, and a control system. It 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 double-row test stand for bearing pressure of the inner cylinder support bracket 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 Shanghai Tower, which has been completed, 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. At present, there are still many famous super high-rise buildings under construction in China, such as the China Zun in Beijing, the Greenland Center in Wuhan, and the 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 generally recognized in the construction engineering field in China and has been fully practiced in major projects such as the Oriental Pearl TV Tower, the Shanghai Jinmao Tower, the Shanghai World Financial Center, and the 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 raised integrally by means of staged jacking or staged lifting. During the core tube concrete pouring construction stage, all the construction loads on the overall steel platform and its upper part are transmitted to the core tube concrete structure through the support bracket system at the bottom of the inner cylinder scaffold of the steel platform. The structural strength and stiffness of the steel platform structure are relatively good. It can be considered that the main weak positions and potential safety hazards of the steel platform system are at the support bracket position and the local structure of the core tube concrete in contact with the support bracket for force transmission. At present, the research on the bearing capacity and failure mode of the support 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. And the test needs to precede the theory. 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 of super high-rise buildings, which can systematically study the structural characteristics of the support brackets 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 double-row test stand for bearing pressure of the inner cylinder support bracket of a steel platform and a test method thereof.

[0005] To solve the above problems, the present invention provides a double-row test stand for bearing pressure of the inner cylinder support bracket of a steel platform, including:

[0006] A 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] A reaction frame system connected to the bottom plate 1;

[0009] The platform system is located between the shear walls 2. Two supporting brackets 9 extending out respectively on both sides of the platform system form a double-row structure, and the supporting brackets 9 are respectively erected on the shear walls 2.

[0010] The 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.

[0011] The control system respectively connected to the loading system and the platform system is used to respectively control the expansion and contraction of the supporting brackets 9 and the loading system.

[0012] Furthermore, in the above-mentioned steel platform inner cylinder supporting bracket bearing double-row test stand, two bracket pin housings 11 with the same height or a groove-shaped space formed by the bracket pin housings 11 are respectively provided on each shear wall 2, and each supporting bracket 9 extends into the corresponding bracket pin housing 11 or the groove-shaped space.

[0013] Furthermore, in the above-mentioned steel platform inner cylinder supporting bracket bearing double-row test stand, the reaction 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 that of 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 a top balance beam 4.

[0017] Furthermore, in the above-mentioned steel platform inner cylinder supporting bracket bearing double-row test stand, the platform system includes:

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

[0019] The supporting brackets 9, the supporting brackets 9 are retractable steel components;

[0020] The bracket jacking oil cylinder 10, 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.

[0021] The bracket fixing boot 12 is a boot-shaped steel member with a hole in the middle. It 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 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] Further, in the above-mentioned steel platform inner cylinder supporting bracket bearing double-row test stand, the loading system includes:

[0023] Four hydraulic cylinders 6. The hydraulic cylinders 6 are vertical actuating devices, and the rear ends of the hydraulic cylinders 6 are fixed to the lower ends of the top balance beam 4;

[0024] Four axial force sensors 7. Each axial force sensor 7 is a sensor for monitoring the axial force output by the hydraulic cylinder 6. The front end of the telescopic rod of each hydraulic cylinder 6 is fixedly connected to a corresponding axial force sensor 7, and each axial force sensor 7 is connected to the platform frame 8.

[0025] Further, in the above-mentioned steel platform inner cylinder supporting bracket bearing double-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 pushing oil cylinder 10, and is used to monitor the axial force data of the axial force sensor 7.

[0026] Further, in the above-mentioned steel platform inner cylinder supporting bracket bearing double-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 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.

[0027] Further, in the above-mentioned steel platform inner cylinder supporting bracket bearing double-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.

[0028] Further, in the above-mentioned steel platform inner cylinder supporting bracket bearing double-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.

[0029] According to another aspect of the present invention, there is provided a double-row test method for the bearing pressure of the corbel for supporting the inner cylinder of the steel platform, using the double-row test stand for the bearing pressure of the corbel for supporting the inner cylinder of the steel platform described in any one of the above. The method includes:

[0030] Step 1: Complete the integral pouring of two shear walls 2 on the bottom plate 1 according to the structural design scheme; complete the erection 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, erect the platform system on the bottom plate 1, control the corbel for support of the platform system, i.e., the corbel 9, to be in the retracted state through the corbel jacking cylinder 10 of the platform system, control the hydraulic cylinder 6 to extend its telescopic rod through the control system, so that the axial force sensor 7 at the lower end contacts the upper end of the platform frame 8 of the platform system, and firmly fix the axial force sensor 7 to the platform frame 8.

[0031] Step 2: Control the four 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 grooved space of the shear wall 2.

[0032] Step 3: Control the corbel jacking cylinder 10 of the platform system to extend and push the corbel for support 9 to extend a preset distance from the corbel fixing boot 12 of the platform system and extend into the corbel pin housing 11 or the grooved space on the structure of the shear wall 2.

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

[0034] Step 5: During the process of applying the downward axial force, continuously monitor the magnitude of the downward axial force through the axial force sensor 7, and thereby control the magnitude and attitude of the output axial force of the hydraulic cylinder 6, and simultaneously monitor the deformation and failure conditions of the concrete structure near the corbel pin housing 11 or the grooved space on the shear wall 2 in real time.

[0035] Step 6: Continuously apply the downward axial force according to the test plan. After achieving the purpose of this test, control the four hydraulic cylinders 6 of the loading system to reduce the vertical force axial force through the control system until the vertical contact force between the corbel for support 9 and the corbel pin housing 11 or the grooved space is zero, control the corbel jacking cylinder 10 to contract through the control system to retract the corbel for support 9 into the corbel fixing boot 12; control the hydraulic cylinder 6 to extend to lower the platform system to the bottom plate 1 and form a firm contact, and loosen the fixation of the axial force sensor 7 to the platform system. Thus, the test ends.

[0036] Compared with the prior art, 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. It 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 safety assessments on the support system of the overall steel platform construction technology for super high-rise buildings. Description of the Drawings

[0037] Figure 1 Schematic diagram of the double-row bearing test frame of the corbel for the inner cylinder of the steel platform according to an embodiment of the present invention;

[0038] Figure 2 Front view of the double-row bearing test frame of the corbel for the inner cylinder of the steel platform according to an embodiment of the present invention;

[0039] Figure 3 Top view of the double-row bearing test frame of the corbel for the inner cylinder of the steel platform according to an embodiment of the present invention;

[0040] Figure 4 Installation schematic diagram of the reaction frame of the double-row bearing test frame of the corbel for the inner cylinder of the steel platform according to an embodiment of the present invention;

[0041] Figure 5 Schematic diagram of the corbel 9 for the inner cylinder of the steel platform extending into the corbel pin housing 11 in the double-row bearing test frame according to an embodiment;

[0042] Figure 6 Disassembly schematic diagram of the double-row bearing test frame of the corbel for the inner cylinder of the steel platform according to an embodiment;

[0043] Figure 7 Schematic diagram of the bottom platform frame 8 of the double-row bearing test frame of the corbel for the inner cylinder of the steel platform resting on the bottom plate 1 according to an embodiment;

[0044] Figure 8 Schematic diagram of the bottom platform frame 8 of the double-row bearing test frame of the corbel for the inner cylinder of the steel platform being lifted to the test position according to an embodiment;

[0045] Figure 9 Schematic diagram of the vertical steel column 5 of the double-row bearing test frame of the corbel for the inner cylinder of the steel platform being arranged outside the shear wall 2 according to an embodiment;

[0046] 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. Detailed Embodiments

[0047] 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 embodiments.

[0048] As Figures 1 to 9 shown, the present invention provides a double-row test stand for the bearing pressure of the inner cylinder of a steel platform with a bracket, comprising:

[0049] A bottom plate 1;

[0050] Shear walls 2 fixed on the bottom plate 1 and arranged opposite to each other and spaced apart by a preset distance;

[0051] A reaction frame system connected to the bottom plate 1;

[0052] A platform system, the platform system is located between the shear walls 2, and two brackets 9 respectively extending out are formed on both sides of the platform system to form a double-row structure, and the brackets 9 are respectively erected on the shear walls 2;

[0053] 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;

[0054] A control system respectively connected to the loading system and the platform system, for respectively controlling the expansion and contraction of the brackets 9 and the loading system.

[0055] Herein, the bottom plate 1 is a rectangular reinforced concrete structural plate member, and the bottom plate 1 is integrated with the shear wall 2, which plays a role in supporting the shear wall 2 and provides a stable support for the entire test stand.

[0056] 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 pressure 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.

[0057] As Figures 1 to 9 shown, in an embodiment of the double-row test stand for the bearing pressure of the inner cylinder of the steel platform of the present invention, two bracket pin housings 11 with the same height or a groove-shaped space formed by the bracket pin housings 11 are respectively provided on each shear wall 2, and each bracket 9 extends into the corresponding bracket pin housing 11 or the groove-shaped space.

[0058] Here, the shear wall 2 is a core tube shear wall structure of a super high-rise building cast in one piece. There is a bracket 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 reinforced concrete structure cast in one piece or a steel reinforced concrete structure cast in one piece. Two shear walls 2 with the same specifications are located on both sides of the upper part of the bottom plate 1. The distance between the two shear walls 2 is determined according to the super high-rise building design scheme. Four bracket pin housings 11 with the same height are arranged on the inner sides of the two shear walls 2; the bracket pin housing 11 is a steel shell structure for the bracket 9 to extend into, and the installation height of the bracket pin housing 11 is determined according to the test design scheme.

[0059] The bracket pin housing 11 is installed together with the formwork before the casting of the shear wall 2 and serves as a mold during the overall concrete casting construction of the shear wall 2. After the overall casting of the shear wall 2 is completed and the concrete forms strength, first remove the formwork. The bracket pin housing 11 can be left on the shear wall 2 or removed, and a groove-shaped space for the bracket 9 to extend into is formed on the shear wall 2;

[0060] 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;

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

[0062] As Figures 1 to 9 shown, in an embodiment of the steel platform inner tube supporting bracket bearing double-row test rack of the present invention, the reaction frame system includes:

[0063] Two bottom balance beams 3 buried in the bottom plate 1;

[0064] Two top balance beams 4;

[0065] 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 a top balance beam 4.

[0066] Here, the reaction force frame system is a self - balancing system that provides the test reaction force, and 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 transverse connecting beams, and is horizontally placed above the entire device. 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 composed of 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.

[0067] As Figures 1 to 9 shown, in an embodiment of the double - row test rack with a bearing corbel for the inner cylinder of the steel platform of the present invention, the platform system includes:

[0068] A platform frame 8, which is a rectangular frame composed of multiple H - shaped steel platform beams;

[0069] A bearing corbel 9, which is a retractable steel member;

[0070] A corbel jacking oil cylinder 10, which is a horizontally retractable actuating device. The rear end of the bearing corbel 9 is connected to the corbel jacking oil cylinder 10;

[0071] A corbel fixing boot 12, which is a boot - shaped steel member with a hole in the middle. It is fixed at the side position of the platform frame 8. The bearing 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 bearing corbel 9 in the left - right two directions, so that the bearing corbel 9 can only make telescopic movements in the front - rear two directions under the action of the corbel jacking oil cylinder 10.

[0072] Here, the platform system is the same device as the bottom platform frame of the integral steel platform inner - cylinder scaffold, and is composed of a platform frame 8, a bearing corbel 9, a corbel jacking oil cylinder 10, and a corbel fixing boot 12. The platform frame 8 is a rectangular frame composed of multiple H - shaped steel platform beams. The bearing corbel 9 is a retractable steel member. The corbel jacking oil cylinder 10 is a horizontally retractable actuating device. The rear end of the bearing corbel 9 is connected to the corbel jacking oil cylinder 10, and its telescoping is controlled by the corbel jacking oil cylinder 10. The corbel 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 bearing 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 bearing corbel 9 in the left - right two directions, so that the bearing corbel 9 can only make telescopic movements in the front - rear two directions under the action of the corbel jacking oil cylinder 10. The bearing corbel 9 extends into the corbel pin housing 11 on the shear wall 2.

[0073] As Figures 1 to 9As shown in the figure, in an embodiment of the bearing double-row test rack for the steel platform inner cylinder resting bracket of the present invention, the loading system includes:

[0074] Four hydraulic cylinders 6, the hydraulic cylinders 6 are vertical actuating devices, and the rear ends of the hydraulic cylinders 6 are fixed to the lower ends of the top balance beams 4;

[0075] Four axial force sensors 7, each 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 each hydraulic cylinder 6 is fixedly connected to a corresponding axial force sensor 7, and each axial force sensor 7 is connected to the platform frame 8.

[0076] Herein, the loading system is composed of the hydraulic cylinder 6 and the axial force sensor 7; the hydraulic cylinder 6 is an accurately controllable vertical actuating device, having a vertical telescopic degree of freedom and capable of providing a downward axial force. There are four 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, and the axial force sensor 7 is located at the front end of the hydraulic cylinder 6, connecting the telescopic rod of the hydraulic cylinder 6 and the platform frame 8.

[0077] As Figures 1 to 9 shown in the figure, in an embodiment of the bearing double-row test rack for the steel platform inner cylinder resting bracket 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 jacking cylinder 10, and is used to monitor the axial force data of the axial force sensor 7.

[0078] Herein, the control system is an electronic system for accurately 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 of the axial force sensor 7.

[0079] As Figures 1 to 9 shown in the figure, in an embodiment of the bearing double-row test rack for the steel platform inner cylinder resting bracket of the present invention, under the control of the control system, the hydraulic cylinder 6 provides 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.

[0080] As Figures 1 to 8 shown in the figure, in an embodiment of the bearing double-row test rack for the steel platform inner cylinder resting bracket of the present invention, the vertical steel column 5 is arranged in 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.

[0081] AsFigure 9 As shown in the figure, in an embodiment of the double-row test stand for the bearing of the inner cylinder's supporting bracket of the steel platform of the present invention, the vertical steel column 5 is arranged outside the shear wall 2 structure. The structure of the shear wall 2 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 the space enclosed by the bottom balance beam 3, the vertical steel column 5 and the top balance beam 4.

[0082] On the other hand, according to the present invention, there is also provided a method for testing the bearing of the inner cylinder's supporting bracket of the steel platform. Using the double-row test stand for the bearing of the inner cylinder's supporting bracket of the steel platform described in any one of the above, the method includes:

[0083] Step 1, test preparation: Complete the integral pouring of the two shear walls 2 on the bottom plate 1 according to the structural design scheme. 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 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 supporting bracket 9 of the platform system to be in the retracted state through the bracket jacking cylinder 10 of the platform system. 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 contacts the upper end of the platform frame 8 of the platform system, and firmly fix the axial force sensor 7 to the platform frame 8.

[0084] Step 2, lifting of the platform frame 8: Control the four 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 bracket pin housing 11 or the grooved space of the shear wall 2.

[0085] Step 3, extension of the supporting bracket 9: Control the bracket jacking cylinder 10 of the platform system to extend and push the supporting bracket 9 to extend a preset distance from the bracket fixing boot 12 and extend into the bracket pin housing 11 or the grooved space on the shear wall 2 structure.

[0086] Step 4, vertical loading and deformation monitoring: Control the four 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 depends on the actual load of the overall steel platform, and the increase rate of the axial force and the loading time depend on the test design scheme.

[0087] Step 5, test monitoring: During the process of applying the downward axial force, the magnitude of the downward axial force is monitored in real time through the axial force sensor 7, and based on this, the output axial force magnitude and attitude of the hydraulic cylinder 6 are controlled. At the same time, the deformation and failure conditions of the concrete structure near the bracket pin housing 11 or the grooved space on the shear wall 2 are monitored in real time.

[0088] Step 6, end of the test: Continue to apply downward axial force according to the test plan. After achieving the purpose of this test, the control system controls the four 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.

[0089] Specifically, Figures 1 to 9 As shown, the double-row pressure-bearing test frame with inner tube of steel platform and brackets of this embodiment is composed of a base plate 1, a shear wall 2, a reaction frame system, a platform system, a loading system, and a control system.

[0090] The bottom plate 1 of this embodiment is a rectangular reinforced concrete structure plate member with a length of 10m and a width of 7.5m.

[0091] The shear wall 2 of this embodiment is a 0.6m thick and 3.5m high integral cast-in-place super high-rise building core tube shear wall structure. The structural form of the shear wall 2 is an integral cast reinforced concrete structure. Two shear walls 2 of the same specifications are located on both sides symmetrically of the upper part of the base plate 1. The distance between the two shear walls 2 is 6.2m. Four corbel pin shells 11 with a height of 1.3m are arranged on the inner side of the two shear walls 2.

[0092] The reaction frame system of this embodiment is composed of a bottom balance beam 3, a top balance beam 4, and a vertical steel column 5. The bottom balance beam 3 is two H-shaped steel members with a length of 7.4m, 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 with a length of 7.4m and four H-shaped steel transverse connecting beams with a length of 2.2m. The vertical steel column 5 is four H-shaped steel members with a height of 4.8m, which are arranged vertically on the bottom plate 1.

[0093] The platform system of this embodiment is composed of a platform frame 8, a shelf bracket 9, a bracket push cylinder 10, and a bracket fixing boot 12. The platform frame 8 is a rectangular frame with a length of 5.8m and a width of 5m formed by multiple H-shaped steel platform beams. The shelf bracket 9, the bracket push cylinder 10, the bracket pin housing 11, and the bracket fixing boot 12 are shaped as follows: Figure 6 As shown, the extension distance of the resting 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.

[0094] The loading system of this embodiment consists of a hydraulic cylinder 6 and an axial force sensor 7. The maximum axial force that the four hydraulic cylinders 6 can provide is 150t, and the maximum total vertical force that can be provided is 600t. The loading capacity is greater than the actual maximum gravity load of the overall steel platform.

[0095] 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.

[0096] Leave the bracket pin housing 11 on the shear wall 2. During the test, the resting bracket 9 is placed on the bracket pin housing 11, and the vertical load of the resting bracket 9 is indirectly transmitted to the shear wall 2 structure through the bracket pin housing 11.

[0097] 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:

[0098] Step 1. Test preparation: Complete the integral pouring of the 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 system, and firmly lap the platform system and the loading system;

[0099] Step 2. Lift the platform frame 8: Control the four hydraulic cylinders 6 to synchronously contract their telescopic rods through the control system, so that the platform frame 8 is lifted as a whole by 1.3m to the height of the bracket pin housing 11;

[0100] Step 3. Extend the resting bracket 9: Control the bracket jacking cylinder 10 to extend through the control system to push the resting bracket 9 to extend 0.25m 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 0.13m;

[0101] Step 4. Vertical loading and deformation monitoring: Control the four 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 50t, and the total vertical load is 200t, simulating the vertical load transmitted by the overall steel platform system to the resting bracket 9 under normal use conditions. The increasing rate of the axial force is 5t / min;

[0102] Step 5. Test monitoring: While applying the vertical load, continuously monitor the magnitude of the downward axial force through the axial force sensor 7, and at the same time use a high-definition camera and an image analysis system to continuously monitor the concrete structure deformation and failure conditions near the bracket pin housing 11 on the shear wall 2;

[0103] Step 6, end of test: After continuously applying downward axial force for 6 hours according to the test plan, the control system controls the four hydraulic cylinders 6 of the loading system to reduce the vertical axial force until the vertical contact force between the shelf corbel 9 and the corbel pin housing 11 is zero, and the control system controls the corbel pushing cylinder 10 to contract and retract the shelf 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.

[0104] Compared with the prior art, the present invention has the following three advantages:

[0105] 1. It can reproduce the real loading condition: the platform system of the present invention is completely consistent with the bottom platform beam used by the integral steel platform, and the vertical load provided by the loading system can be completely consistent with the gravity load of the integral steel platform. Therefore, the present invention can partially reproduce the formal loading condition of the integral steel platform system.

[0106] 2. Strong testing capability and rich monitoring data: The loading system of the test frame device proposed in the present invention can apply a vertical force greater than the actual gravity load of the steel platform, can test the ultimate bearing performance of the structure of the shear leg 9 and the local pressure-bearing part of the shear wall 2, can apply uneven loads and repeatedly apply loads, can test the vertical load combination under complex working conditions, and has strong testing capabilities; The loading system of the test frame 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 shear leg 9, the corbel fixing boot 12, etc., and can also monitor the local deformation and damage of the shear wall 2 under the action of load.

[0107] 3. Convenient for repeated use: The loading system of the test frame device proposed in the present invention can be reused. After a test is completed, the shear wall 2 structure is dismantled, and a new shear wall 2 structure can be recast according to different design schemes, thereby testing the local bearing capacity and failure form of the shear wall 2 structure with different structural forms.

[0108] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0109] 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 invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A bearing double-row test stand for the inner cylinder of a steel platform with a corbel, characterized in that, Comprising: Base plate (1); Shear walls (2) fixed on the base plate (1) and arranged opposite to each other with a preset distance therebetween; Reaction frame system connected to the base plate (1); Platform system, the platform system is located between the shear walls (2), and two outrigger brackets (9) extending respectively from both sides of the platform system form a double-row structure, and the outrigger brackets (9) are respectively mounted 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 expansion and contraction of the outrigger brackets (9) and the loading system; Two corbel pin housings (11) with the same height or a groove-shaped space formed by the corbel pin housings (11) are respectively provided on each shear wall (2), and each outrigger bracket (9) extends into the corresponding corbel pin housing (11) or the groove-shaped space; The reaction frame system includes: Two bottom balance beams (3) buried in the base plate (1); Two top balance beams (4); Four vertical steel columns (5) with a height higher than that of 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 a 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; Outrigger brackets (9), the outrigger brackets (9) are retractable steel members; Outrigger jacking oil cylinders (10), the outrigger jacking oil cylinders (10) are horizontally retractable actuating devices, and the rear end of the outrigger bracket (9) is connected to the outrigger jacking oil cylinder (10); Outrigger fixing boots (12), the outrigger fixing boots (12) are boot-shaped steel members with a hole in the middle, fixed at the side position of the platform frame (8), the outrigger bracket (9) passes through the hole in the middle of the outrigger fixing boot (12), and the outrigger fixing boot (12) fixes the degrees of freedom of the outrigger bracket (9) in the left and right directions, so that the outrigger bracket (9) only makes expansion and contraction movements in the front and rear directions under the action of the outrigger jacking oil cylinder (10); The loading system includes: Four hydraulic cylinders (6), the hydraulic cylinders (6) are vertical actuating devices, and the rear ends of the hydraulic cylinders (6) are fixed to the lower ends of the top balance beams (4); Four axial force sensors (7), each 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 each hydraulic cylinder (6) is fixedly connected to a corresponding axial force sensor (7), and each axial force sensor (7) is connected to the platform frame (8); The control system is used to control the axial force magnitude and expansion and contraction attitude of the hydraulic cylinders (6) and the outrigger jacking oil cylinders (10), and is used to monitor the axial force data of the axial force sensors (7); The vertical steel column (5) is arranged inside the shear wall (2) structure. The lower half of the vertical steel column (5) is embedded in the shear wall (2), and the lengths of the bottom balance beam (3) and the top balance beam (4) are the same as the distance between two shear walls (2).

2. The bearing double-row test stand for the steel platform inner cylinder support bracket as described in claim 1, wherein 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 bracket fixing boot (12) fixed on the 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-like space, and finally transmits the downward axial force provided by the hydraulic cylinder (6) to the shear wall (2) structure.

3. The bearing double-row test rack for the inner cylinder of the steel platform bracket as described in claim 2, characterized in that, 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 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).

4. A double-row test method for the bearing pressure of the corbel for placing the inner cylinder of a steel platform, characterized in that, Using the steel platform inner cylinder supporting bracket bearing double-row test stand according to any one of claims 1 to 3, the method includes: Step 1: Complete the integral 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, and 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 supporting bracket (9) of the platform system to be in the retracted state through the bracket jacking cylinder (10) of the platform system. Control the hydraulic cylinder (6) to extend its telescopic rod through the control system, so that the axial force sensor (7) at the lower end of the telescopic rod contacts the upper end of the platform frame (8) of the platform system, and firmly fix the axial force sensor (7) and the platform frame (8). Step 2: Control the four 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 bracket pin housing (11) or the groove-like space of the shear wall (2). Step 3: Control the bracket jacking cylinder (10) of the platform system to extend through the control system to push the supporting bracket (9) to extend a preset distance from the bracket fixing boot (12) of the platform system and extend into the bracket pin housing (11) or the groove-like space on the shear wall (2) structure. Step 4: Control the four 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, monitor the magnitude of the downward axial force in real time through the axial force sensor (7), and control the magnitude and attitude of the output axial force of the hydraulic cylinder (6) accordingly. At the same time, monitor the concrete structure deformation and damage conditions near the bracket pin housing (11) or the groove-like space on the shear wall (2) 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 four hydraulic cylinders (6) of the loading system to reduce the vertical axial force so that 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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