Split type testing device for detecting performance of prefabricated laminated slab structure

Abstract

The utility model discloses a split type test device for detecting the performance of a prefabricated laminated slab structure. The split type test device comprises a base frame and a plurality of movable counter-force gantries which are arranged above the base frame in a crossing manner, a plurality of supporting frames are arranged on the base frame, the multiple supporting frames are used for supporting the prefabricated laminated slab in a matched mode, and the supporting frames can slide in the length direction of the base frame and are locked; the movable counter-force portal comprises a counter-force cross beam, counter-force portal stand columns are arranged at the two ends of the counter-force cross beam, dowel bars are arranged between the counter-force cross beam and the two side edges of the base frame, and the dowel bars can slide in the length direction of the corresponding side edges and are locked. And a loading distribution device is arranged between the counter-force cross beam and the surface of the prefabricated laminated slab on the support frame. According to the utility model, the detection requirements of different types of prefabricated laminated slabs can be flexibly met, the data accuracy and the operation safety in the test process are ensured, and powerful support is provided for the quality control and the performance evaluation of the prefabricated laminated slabs.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fabricated building detection, and particularly relates to a split type test device for detecting structural performance of a prefabricated composite slab. BACKGROUND

[0002] With the rapid development of fabricated buildings, prefabricated composite slabs have become common structural components in modern buildings due to their efficient construction, controllable quality, and energy-saving and environment-friendly characteristics. In particular, in high-rise building and industrialized residential projects, the application of prefabricated composite slabs greatly improves construction efficiency and quality. However, how to ensure the safety, stability and long-term durability of prefabricated composite slabs in actual use has become an important issue that cannot be ignored in the construction industry.

[0003] In order to ensure that prefabricated composite slabs meet design requirements during construction and use, structural performance testing has become an indispensable link. According to the relevant provisions of the "Concrete Structure Engineering Construction Quality Acceptance Specification" (GB 50204-2015), the structural performance testing of prefabricated composite slabs needs to consider load action and deformation characteristics, and test under actual working conditions such as construction load and post-cast layer. In particular, during the construction phase, the influence of construction load on prefabricated composite slabs under stress state should be fully considered to ensure that they can still maintain sufficient safety under the most unfavorable working conditions.

[0004] Currently, the structural performance testing of prefabricated composite slabs usually adopts the load block loading method. This method gradually increases the load according to the standard load, and observes the crack development, deflection change and steel bar slip within the specified time to determine the bearing capacity and crack control performance of the component. Specifically, the support mode of prefabricated composite slabs during the test is generally in the form of one end hinged support and the other end rolling support, and the support spacing is set according to the actual size of the component. In addition, the test needs to be continuously monitored under different loads until the component appears cracks or reaches the predetermined deflection standard (such as L / 400) to evaluate its performance indicators.

[0005] However, the existing prefabricated composite slab test device has some limitations in actual application, mainly in the following aspects: (1) poor applicability, the current test device is mainly designed for single size or standard span composite slab, and it is difficult to adapt to prefabricated composite slabs of different spans, for example, the traditional counterforce gantry is difficult to adjust the support position flexibly, which makes it difficult to load test large-span prefabricated composite slabs, thereby affecting the accuracy and stability of the loading process; (2) the loading process is complicated, during the loading process of the load block, the existing device has high requirements for the handling method of the load block, especially for the floor with a large width, if the load block is to be uniformly distributed on the floor surface, personnel must climb onto the floor to arrange in the central area of the floor, which increases the operation difficulty and safety risk, in addition, the load application speed and loading method of the existing equipment are fixed, which is difficult to flexibly adapt to different test requirements; (3) the stability of the test device is insufficient, the supporting capacity of the existing counterforce gantry and support system for large-span prefabricated composite slabs is limited, which may cause instability during the test process, affecting the uniformity and accuracy of the loading, and further affecting the accuracy of the test results; (4) detection precision problem, in some tests, especially in the monitoring of crack width and deflection, the existing method and equipment are difficult to provide sufficient measurement accuracy. Especially when the crack width is small or the deflection is small, it is difficult to accurately obtain real-time data.

[0006] Therefore, in order to overcome the above problems, it is necessary to develop a prefabricated composite slab structural performance detection device with better adaptability, flexibility and high precision, to meet the test requirements of prefabricated composite slabs of different heights and spans, and to provide a more reliable, stable and safe detection scheme. SUMMARY

[0007] The technical problem to be solved by the utility model is to provide a split type test device for prefabricated composite slab structural performance detection, which can flexibly cope with the detection requirements of different types of prefabricated composite slabs, ensure the data accuracy and operation safety during the test process, and provide strong support for the quality control and performance evaluation of prefabricated composite slabs.

[0008] In order to solve the above technical problems, the utility model provides a split type test device for prefabricated composite slab structural performance detection, which comprises a base frame and a plurality of movable counterforce gantries arranged above the base frame;

[0009] A plurality of support frames are arranged on the base frame, and the plurality of support frames are used to support the prefabricated composite slab, and the support frame can slide and lock along the length direction of the base frame;

[0010] The movable counterforce gantry comprises a counterforce beam, both ends of the counterforce beam are provided with counterforce gantry columns, a force transmission rod is arranged between the counterforce beam and the two side edges of the base frame, the force transmission rod can slide and be locked along the length direction of the corresponding side edge, and a load distribution device is arranged between the counterforce beam and the surface of the prefabricated composite slab on the support frame.

[0011] Further, the base frame comprises a first longitudinal beam, a first transverse beam, a second longitudinal beam and a second transverse beam connected in sequence, along the length direction of the first longitudinal beam, the base frame is divided into a middle-span test section and side-span test sections located on both sides of the middle-span test section, the first longitudinal beam and the second longitudinal beam corresponding to the middle-span test section are provided with connecting screw holes, and the first longitudinal beam and the second longitudinal beam corresponding to the side-span test sections are provided with sliding grooves.

[0012] Further, the number of the movable counterforce gantries is 6, the number of the support frames is 4, the force transmission rods of the two movable counterforce gantries in the middle and the two support frames in the middle are locked by bolts and connecting screw holes, and the remaining movable counterforce gantries and the remaining support frames are locked by bolts and sliding grooves.

[0013] Further, the center distance between the two support frames in the middle-span test section is 1600mm.

[0014] Further, the support frame comprises two support columns, a support transverse beam is arranged at the top of the two support columns, and a rolling hinge support or a fixed hinge support is arranged at the top of the support column.

[0015] Further, the number of the force transmission rods corresponding to each side edge of the base frame is 4, the top of the force transmission rod is connected with a force transmission plate, the force transmission plate abuts against the top surface of the counterforce beam, the four force transmission rods are arranged on both sides in the width direction of the counterforce beam, the bottom of the four force transmission rods is fixed with a connecting plate, and the connecting plate is connected with the side edge on the corresponding base frame.

[0016] Further, the load distribution device comprises a long distribution beam and two short distribution beams, a long beam fixed hinge support and a long beam rolling support are arranged between the long distribution beam and the short distribution beams, a short beam fixed hinge support and a short beam rolling support are arranged between the two short distribution beams and the prefabricated composite slab, and a hydraulic jack is arranged between the middle part of the long distribution beam and the counterforce beam.

[0017] Further, the diameter of the force transmission rod is not less than 20mm.

[0018] Further, the first longitudinal beam and the second longitudinal beam are prepared from I-beams, and a plurality of stiffening plates are uniformly arranged between the upper flange plate and the lower flange plate of the I-beam corresponding to the sliding groove.

[0019] Further, the counterforce portal column bottom is provided with a moving cross beam, and the moving cross beam is provided with a pulley.

[0020] The utility model discloses beneficial effect:

[0021] 1, the device adopts split design, through the combination of movable counterforce portal and loading distribution device, can adapt to the prefabricated composite board structure performance detection of different span, has stronger adaptability.

[0022] 2, the device has the function of on-line adjustment in the support frame position of side span, especially suitable for detecting different span prefabricated composite board, can flexibly adjust span according to the need.

[0023] 3, through the design of loading distribution device and movable counterforce portal complete set setting, can evenly distribute load and realize three span loading detection, ensure the accuracy and reliability of test.

[0024] 4, the base frame and support frame design fully considers the strength and stability, uses high-strength H-shaped steel, I-beam and stiffened plate and other materials, ensures the rigidity and carrying capacity of the device.

[0025] 5, through the setting of pulley and hydraulic jack, can make counterforce portal move and adjust on line easily, reduce the difficulty and labor intensity of manual operation, convenient operation. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the overall structure schematic diagram of the split type test device of the utility model;

[0027] Figure 2 It is the movable counterforce portal structure schematic diagram of the utility model;

[0028] Figure 3 It is the loading distribution device structure schematic diagram of the utility model;

[0029] Figure 4 It is the support frame schematic diagram of the utility model;

[0030] Figure 5 It is the base frame structure schematic diagram of the utility model;

[0031] Figure 6 It is the movable counterforce portal and base frame connecting structure schematic diagram of the utility model in side span test section;

[0032] Figure 7 It is the movable counterforce portal and base frame connecting structure schematic diagram of the utility model in middle span test section. SPECIFIC EMBODIMENT

[0033] The utility model is further described below in combination with the drawings and specific embodiments, so that those skilled in the art can better understand the utility model and implement it, but the embodiments are not used as the limitation of the utility model.

[0034] Referring to Figure 1 With Figure 7 As shown in the utility model provides an embodiment of split type test device for prefabricated composite slab structure performance detection, for detecting prefabricated composite slab 1, including movable counterforce portal frame 2, loading distribution device 3, support frame 4 and base frame 5. Four support frames 4 are fixed to base frame 5 by bolts, and split type test device is divided into two edge span test sections and one middle span test section, among four support frames 4, two are fixed in middle span test section, and the other two are slidably fixed in two edge span test sections. The span of middle span test section is fixed value 1600mm, and the span of two edge span test sections is adjustable, that is, the fixed position of support frame in edge span test section is adjustable, and the maximum value is 1600mm, to meet the detection of existing prefabricated composite slab size, and the application range is wide. Prefabricated composite slab 1 is placed on support frame 4 through support and is provided with a set of loading distribution device 3 on the surface of prefabricated composite slab at the three equal division point position between two adjacent supports, that is, two loading distribution devices 3 are arranged in an interval. One movable counterforce portal frame 2 is arranged correspondingly in each loading distribution device 3, and movable counterforce portal frame 2 is connected with base frame 5 through force transmission rod 23, forming a self-balancing loading system. Then, prefabricated composite slab structure performance detection can be carried out through hydraulic jack 6 on loading distribution device.

[0035] The above support frame 4 is composed of support column 41 and support beam 42, and support column 41 and support beam 42 are connected and fixed through support frame bolt 43. Round holes are arranged on the lower end plate of support column 41, and the lower end plate is fixedly connected to base frame through connecting bolt 44. Four sets of support frames are arranged on base frame from left to right in sequence, and rolling hinge support 45, rolling hinge support, fixed hinge support 46 and rolling hinge support are placed on the beams of each set of structure in sequence.

[0036] The base frame 5 described above is composed of a first longitudinal beam 51, a second longitudinal beam 52, a first cross beam 53 and a second cross beam 54, and is an H-shaped steel, each beam is connected by a bolt 55, forming a rectangular frame structure. The first cross beam 53 and the second cross beam 54 are in the two side span test sections, the first longitudinal beam 51 and the second longitudinal beam 52 are in the middle span test section, and the remaining two side portions are in the two side span test sections. Two sliding grooves 56 are arranged on the first longitudinal beam 51 and the second longitudinal beam 52 in the side span test section, and are symmetrical along the web on the upper flange plate. A plurality of stiffeners 510 are arranged between the upper flange plate and the lower flange plate on the side of the sliding groove away from the web. In the middle span test section, the first longitudinal beam 51 and the second longitudinal beam 52 are provided with connecting screw holes, that is, support frame connecting areas (first circular hole area 57, second circular hole area 58) and counterforce gantry connecting areas (counterforce gantry connecting circular hole area 59). The circular holes of the lower end plate of the support column 41 are opened at the positions of the first circular hole area 57 and the second circular hole area 58, and the connecting rods of the movable counterforce gantry 2 are also opened at the corresponding counterforce gantry connecting areas.

[0037] The movable counterforce gantry 2 described above includes a counterforce cross beam 21, and a force transmission plate 22 is arranged on each side of the top surface of the counterforce cross beam 21 corresponding to the positions of the first longitudinal beam and the second longitudinal beam. The force transmission plate 22 is symmetrically provided with two circular holes along the counterforce cross beam 21, and four force transmission rods 23 are arranged. The four force transmission rods 23 pass through the circular holes on the force transmission plate 22 and are locked and limited. Specifically, the force transmission rod 23 is provided with an upper threaded section 231, and the connection between the force transmission plate 22 and the force transmission rod 23 is achieved by a nut 24. The counterforce cross beam 21 is provided with a counterforce gantry column 25 at each end, and a moving cross beam 26 is welded to the lower side of the counterforce gantry column 25. A pulley 27 is assembled below the moving cross beam, which can realize the online movement of the counterforce gantry, facilitate the adjustment of the position, and facilitate the hoisting and placing of the prefabricated composite slab. The threaded section 232 of the force transmission rod 23 is connected to the connecting plate 29 through the nut 28 welded on the connecting plate 29, and the connecting plate 29 is provided with four circular holes for connection with the corresponding positions of the base frame 5. The diameter of the force transmission rod 23 is not less than 20 mm, and the connection mode meets the strength requirement.

[0038] The load distribution device 3 is composed of an upper long distribution beam 31, a first short distribution beam 34 and a second short distribution beam 35. The first short distribution beam 34 is provided with a long beam rolling hinge support 32 at the upper center position, and the second short distribution beam 35 is provided with a long beam fixed hinge support 33 at the upper center position. The first short distribution beam 34 and the second short distribution beam 35 are uniformly arranged along the short edge direction of the prefabricated composite slab 1 to be tested. The first short distribution beam 34 is provided below with a first short distribution rolling hinge support 36 and a first short distribution fixed support 37, respectively, and the second short distribution beam 35 is provided below with a second short distribution rolling hinge support 38 and a second short distribution fixed support 39, respectively. During testing, the hydraulic jack 6 is placed at the middle position of the long distribution beam 31.

[0039] The specific operation steps of the split test device in use are as follows:

[0040] (1) Assemble the base frame, assemble the base frame according to the design drawing, the base frame only needs to be assembled once, the first longitudinal beam, the second longitudinal beam, the first transverse beam and the second transverse beam are connected into a whole frame by bolts, four sets of support frames are installed on the base frame to ensure the installation position of the support column is accurate, and the support transverse beam and the support column are fixed by bolts.

[0041] (2) Install the prefabricated composite slab, place the prefabricated composite slab on the support of the support frame, and adjust the span of the support frame according to the experimental requirements. Ensure that the plate body is in a horizontal state, the span of the side span test section can be adjusted to a maximum of 1600mm, the span of the middle span test section is fixed at 1600mm, and the position of the prefabricated composite slab on the support frame is ensured to be accurate.

[0042] (3) Install the load distribution device, connect the long distribution beam with the first short distribution beam and the second short distribution beam through the hinge support, ensure that each load distribution device is connected with the three equal points of the prefabricated composite slab, and ensure uniform loading. Place the hydraulic jack in the middle position of the long distribution beam to ensure that the jack can uniformly apply pressure.

[0043] (4) Install the counterforce portal frame, connect the counterforce transverse beam with the force transmission plate and the force transmission rod, ensure that all connecting nuts are tightened and have sufficient strength. Then, connect the connecting plate with the force transmission rod and move it to the corresponding position of the base frame, adjust the height of the force transmission rod to ensure that the connecting plate is seamlessly connected with the base frame, and remains stable during loading. Finally, use nuts to fix the connecting plate on the counterforce portal frame to ensure that the counterforce portal frame does not move during the test.

[0044] (5) Load and record data, after all components are installed, start the hydraulic jack for loading. During the loading process, gradually increase the pressure, and closely observe the deformation and possible cracks of the prefabricated composite slab. Record the stress, deformation and related physical phenomena at each loading step to ensure the accuracy of the test data.

[0045] (6) Unload and clean up, when the test is completed, gradually unload the hydraulic jack, and record the stress and deformation of the prefabricated composite slab during the unloading process. After unloading is completed, perform cleaning and preparation work.

[0046] The application adopts zoning on the base frame, the support frames and the movable counterforce portal frame in the middle span test section are fixed in size, while the support frames and the movable counterforce portal frame in the side span test section can be adjusted by sliding, thereby effectively adapting to the detection of prefabricated composite slabs of different sizes, and the detection data is accurate.

[0047] The movable counterforce gantry is a movable structure, which can be disassembled and moved to avoid during the hoisting process of the prefabricated composite slab, and can be moved to the corresponding position and locked after the hoisting is completed, so that the movable counterforce gantry only needs to have sufficient strength of the counterforce beam, and thus the overall weight of the movable counterforce gantry can be effectively reduced, and the movable counterforce gantry is convenient and reliable to move.

[0048] The above-described embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or transformations made by those skilled in the art based on the present application are within the protection scope of the present application.

Claims

1. A split type test device for detecting performance of a prefabricated laminated slab structure, characterized in that, The base frame and several movable counterforce gantries arranged across above the base frame are included; Several support frames are arranged on the base frame, and the support frames are matched to support the prefabricated composite slab, and the support frames can slide and lock along the length direction of the base frame; The movable counterforce gantry includes a counterforce beam, and counterforce gantry columns are arranged at both ends of the counterforce beam, and a force transmission rod is arranged between the counterforce beam and the two side edges of the base frame, and the force transmission rod can slide and lock along the length direction of the corresponding side edge, and a load distribution device is arranged between the counterforce beam and the surface of the prefabricated composite slab on the support frame.

2. The split test device for performance testing of precast sandwich panel structures according to claim 1, characterized in that, The base frame includes a first longitudinal beam, a first transverse beam, a second longitudinal beam and a second transverse beam connected end to end, and along the length direction of the first longitudinal beam, the base frame is divided into a middle span test section and side span test sections on both sides of the middle span test section, and the first longitudinal beam and the second longitudinal beam corresponding to the middle span test section are provided with connecting screw holes, and the first longitudinal beam and the second longitudinal beam corresponding to the side span test section are provided with sliding grooves.

3. The split test device for performance testing of precast sandwich panel structures according to claim 2, characterized in that, The number of movable counterforce gantries is 6, and the number of support frames is 4, and the force transmission rods of the two movable counterforce gantries in the middle and the two support frames in the middle are locked by bolts and connecting screw holes, and the remaining movable counterforce gantries and the remaining support frames are locked by bolts and sliding grooves.

4. The split test device for performance testing of precast sandwich panel structures according to claim 3, characterized in that, The center distance between the two support frames in the middle span test section is 1600mm.

5. The split test device for performance testing of precast sandwich panel structures according to claim 1, characterized in that, The support frame includes two support columns, and a support transverse beam is arranged at the top of the two support columns, and a rolling hinge support or a fixed hinge support is arranged at the top of the support column.

6. The split test device for performance testing of precast sandwich panel structures of claim 1, wherein, The number of force transmission rods corresponding to each side edge of the base frame is 4, the top of the force transmission rod is connected with a force transmission plate, the force transmission plate abuts against the top surface of the counterforce beam, two of the four force transmission rods are arranged on both sides in the width direction of the counterforce beam, the bottom of the four force transmission rods is fixed with a connecting plate, and the connecting plate is connected with the side edge on the corresponding base frame.

7. The split test device for performance testing of precast sandwich panel structures of claim 1, wherein, The load distribution device includes a long distribution beam and two short distribution beams, a long beam fixed hinge support and a long beam rolling support are arranged between the long distribution beam and the short distribution beams, a short beam fixed hinge support and a short beam rolling support are arranged between the two short distribution beams and the prefabricated composite slab, and a hydraulic jack is arranged between the middle of the long distribution beam and the counterforce beam.

8. The split test device for performance testing of precast sandwich panel structures of claim 1, wherein, The diameter of the force transmission rod is not less than 20mm.

9. The split test device for performance testing of precast sandwich panel structures of claim 2, wherein, The first longitudinal beam and the second longitudinal beam are made of I-beams, and a plurality of stiffening plates are uniformly arranged between the upper flange plate and the lower flange plate of the I-beam corresponding to the sliding groove.

10. The split test device for performance testing of precast sandwich panel structures of claim 1, wherein, The bottom of the counterforce gantry column is provided with a moving transverse beam, and a pulley is arranged on the moving transverse beam.

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