An experimental device for a multi-angle single-sided bolt group and its assembly method

Abstract

The present invention discloses a multi-angle single-sided bolt group test device and an assembly method thereof, which includes: a mounting assembly, a support frame, and a stretching assembly; two mounting assemblies are arranged oppositely, and the interior of the mounting assembly is used for placing concrete-filled steel tubes; at least one support frame is arranged on the mounting assembly; a plurality of stretching assemblies are located circumferentially around the concrete-filled steel tube, wherein at least one stretching assembly is arranged on the support frame, and there is an installation angle between the stretching assembly arranged on the support frame and other stretching assemblies in the circumferential direction of the concrete-filled steel tube. By arranging a plurality of stretching assemblies circumferentially around the concrete-filled steel tube and connecting them to the test bolts in the concrete-filled steel tube, and at least one stretching assembly is arranged on the support frame, so that there are multiple installation angles between the stretching assemblies, thereby constructing the angle positions required for the bolt group stretching test. The present invention can realize the multi-angle single-sided bolt group stretching test, and is detachable, has clear force transmission, and is simple to manufacture.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and particularly relates to a multi-angle single-sided bolt group test device and an assembly method thereof. Background Art

[0002] Due to the fact that the concrete-filled steel tube structure can make full use of the restraint effect between materials to achieve synergy, complementarity, and co-working, and has the advantages of high strength, good ductility, and convenient construction, it has been widely used in urbanization construction. When it serves as the chord member in a truss or tower structure, it often forms various pipe joints with hollow steel tube web members through intersecting welding. After welding, the concrete-filled steel tube joint forms an irreversible whole, and the reuse and disassembly of components face challenges. As a new type of fastener, the single-sided bolt has the advantages of single-sided tightening, reliable mechanical properties, and convenient construction, which can solve the problem that ordinary high-strength bolts are difficult to apply to the construction and installation of closed-section components, and at the same time provides the feasibility for the transformation of welded composite structures into detachable composite structures. When using a single-sided bolt group in concrete-filled steel tubes, the traditional welded part can be replaced with a bolt connection method to avoid damage to the components of the concrete-filled steel tube structure during the disassembly process to achieve the purpose of structural disassembly.

[0003] At present, most of the relevant research on the basic mechanical properties of single-sided bolts in concrete-filled steel tubes focuses on the tensile properties of a single single-sided bolt, lacking the tensile property test research on single-sided bolt groups with different included angles; the main reason is the lack of a tensile property test device suitable for single-sided bolt groups with different included angles.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0005] In view of the deficiencies of the above-mentioned existing technology, the purpose of the present invention is to provide a multi-angle single-sided bolt group test device and an assembly method thereof, aiming to solve the problem that there is a lack of a tensile property test device suitable for single-sided bolt groups with different included angles in the existing technology.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] In the first aspect, an embodiment of the present invention provides a multi-angle single-sided bolt group test device, which includes:

[0008] An installation component, two of the installation components are arranged oppositely, and the inside of the installation component is used for placing concrete-filled steel tubes;

[0009] A support frame, at least one of the support frames is arranged on the installation component;

[0010] Tensile components, a plurality of the tensile components are located in the circumferential direction of the concrete-filled steel tube and are connected to the test bolts inside the concrete-filled steel tube;

[0011] Wherein, at least one of the tensile components is arranged on the support frame, and there is an installation angle between the tensile component arranged on the support frame and other tensile components in the circumferential direction of the concrete-filled steel tube.

[0012] As a further improved technical solution, in the multi-angle single-sided bolt group test device, the installation component includes:

[0013] A stop block, an installation hole for placing the concrete-filled steel tube is arranged inside the stop block, and first connection surfaces and second connection surfaces inclined to the horizontal direction are arranged on both symmetric sides of the stop block. The first connection surface and the second connection surface are angularly connected, and the stop block is connected to the support frame through the first connection surface or the second connection surface;

[0014] A cushion block, at least one cushion block is arranged on the top surface of the stop block, the side surface of the cushion block facing away from the stop block is a fixed surface, and the cushion block is connected to the support frame through the fixed surface.

[0015] As a further improved technical solution, in the multi-angle single-sided bolt group test device, the number of the cushion blocks is one,

[0016] The angle between the first connection surface and the horizontal direction is equal to the angle between the fixed surface and the horizontal direction, and the first connection surface and the fixed surface are respectively connected to the support frame.

[0017] As a further improved technical solution, in the multi-angle single-sided bolt group test device, the number of the cushion blocks is two, and the two cushion blocks are symmetrically arranged on the top surface of the stop block;

[0018] The angle between the second connection surface and the horizontal direction is equal to the angle between the fixed surface and the horizontal direction, and the second connection surface and the fixed surface are respectively connected to the support frame.

[0019] As a further improved technical solution, in the multi-angle single-sided bolt group test device, the support frame includes:

[0020] A first cross beam, one side of the first cross beam is connected to the fixed surface, and the other side of the first cross beam is connected to the tensile component;

[0021] A second cross beam, the second cross beam is arranged opposite to the first cross beam, and the second cross beam is connected to the first connection surface or the second connection surface;

[0022] A connecting bolt, which is connected between the first cross beam and the second cross beam.

[0023] As a further improved technical solution, in the multi-angle single-sided bolt group test device, the stretching assembly includes:

[0024] A displacement gauge backing plate, which is arranged at one end of the test bolt away from the concrete-filled steel tube;

[0025] A bolt sleeve, which is arranged at one end of the test bolt away from the concrete-filled steel tube and abuts against the displacement gauge backing plate;

[0026] A displacement gauge fixing plate, which is arranged at one end of the bolt sleeve away from the test bolt, and a displacement gauge fixing groove is provided on the displacement gauge fixing plate;

[0027] A displacement gauge, which is arranged on the displacement gauge fixing plate through the displacement gauge fixing groove;

[0028] A displacement gauge clamp, which is arranged on the displacement gauge fixing plate and is detachably connected to the displacement gauge;

[0029] An extension screw rod, one end of which passes through the displacement gauge fixing plate and is connected to one end of the bolt sleeve away from the test bolt;

[0030] A hydraulic actuator, which is movably connected to the other end of the extension screw rod, and the hydraulic actuator is also used to be connected to the first cross beam and the second cross beam.

[0031] As a further improved technical solution, in the multi-angle single-sided bolt group test device, the displacement gauge clamp includes:

[0032] A first clamping block, a second clamping block and a fixing bolt;

[0033] The first clamping block and the second clamping block are both arranged on the displacement gauge fixing plate and clamp on both sides of the displacement gauge, and the fixing bolt is connected between the first clamping block and the second clamping block.

[0034] As a further improved technical solution, in the multi-angle single-sided bolt group test device, the included angle between the first connecting surface and the horizontal direction is 30°.

[0035] As a further improved technical solution, in the multi-angle single-sided bolt group test device, the included angle between the second connecting surface and the horizontal direction is 45°.

[0036] In a second aspect, an embodiment of the present invention provides an assembly method for a multi-angle single-sided bolt group test device, which includes:

[0037] Place the concrete-filled steel tube inside the installation component;

[0038] Set at least one support frame on the installation component;

[0039] Set a plurality of tension components circumferentially around the concrete-filled steel tube, and at least one tension component is arranged on the support frame, so that there is an installation angle between the tension component arranged on the support frame and other tension components in the circumferential direction of the concrete-filled steel tube.

[0040] The technical solution adopted by the present invention has the following beneficial effects:

[0041] In the present invention, two installation components are arranged oppositely, then the concrete-filled steel tube is placed inside the installation component, and then at least one support frame is arranged on the installation component; a plurality of tension components are arranged circumferentially around the concrete-filled steel tube and are connected to the test bolts inside the concrete-filled steel tube. At least one tension component is arranged on the support frame, and there is an installation angle between the tension component arranged on the support frame and other tension components in the circumferential direction of the concrete-filled steel tube. Thus, there are multiple installation angles between the plurality of tension components, and then the angular positions required for the bolt group tension test are constructed, realizing the requirements for the unilateral bolt group tension test at different angles. The multi-angle unilateral bolt group test device in the embodiment of the present invention can realize the multi-angle unilateral bolt group tension test, and is detachable, has clear force transmission, is simple to manufacture, and has good economy. Description of the Drawings

[0042] Figure 1 It is a perspective view of the first implementation structure of a multi-angle unilateral bolt group test device provided by the present invention;

[0043] Figure 2 It is a front view of the first implementation structure of a multi-angle unilateral bolt group test device provided by the present invention;

[0044] Figure 3 It is a top view of the first implementation structure of a multi-angle unilateral bolt group test device provided by the present invention;

[0045] Figure 4 It is a left view of the first implementation structure of a multi-angle unilateral bolt group test device provided by the present invention;

[0046] Figure 5 It is a perspective view of the block in a multi-angle unilateral bolt group test device provided by the present invention;

[0047] Figure 6 It is a front view of the block in a multi-angle unilateral bolt group test device provided by the present invention;

[0048] Figure 7 The left view of the stop block in a multi-angle single-sided bolt group test device provided by the present invention;

[0049] Figure 8 The three-dimensional view when the tensile component and the concrete-filled steel tube in a multi-angle single-sided bolt group test device provided by the present invention are connected;

[0050] Figure 9 For Figure 8 The enlarged view of part A in

[0051] Figure 10 The front view when the tensile component and the concrete-filled steel tube in a multi-angle single-sided bolt group test device provided by the present invention are connected;

[0052] Figure 11 The three-dimensional view of the second implementation structure of a multi-angle single-sided bolt group test device provided by the present invention;

[0053] Figure 12 The front view of the second implementation structure of a multi-angle single-sided bolt group test device provided by the present invention;

[0054] Figure 13 The top view of the second implementation structure of a multi-angle single-sided bolt group test device provided by the present invention;

[0055] Figure 14 The left view of the second implementation structure of a multi-angle single-sided bolt group test device provided by the present invention;

[0056] Figure 15 The flowchart of the preferred embodiment of the manufacturing method of a multi-angle single-sided bolt group test device provided by the present invention.

[0057] Reference numerals: 100, mounting component; 200, support frame; 300, tensile component; 10, concrete-filled steel tube; 20, test bolt; 110, stop block; 120, cushion block; 111, mounting hole; 101, first connection surface; 102, second connection surface; 121, fixing surface; 210, first cross beam; 220, second cross beam; 230, connection bolt; 310, displacement gauge backing plate; 320, bolt sleeve; 330, displacement gauge fixing plate; 340, displacement gauge; 350, displacement gauge clamp; 360, extension screw; 370, hydraulic actuator; 351, first clamping block; 352, second clamping block; 353, fixing bolt. Detailed implementation manners

[0058] To make the objectives, technical solutions and effects of the present invention clearer and more explicit, the following further elaborates on the present invention by way of examples with reference to the accompanying drawings. It should be understood that the specific examples described herein are only used to explain the present invention and are not used to limit the present invention.

[0059] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0060] It should also be noted that the same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0061] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0062] In the prior art, the relevant research on the basic mechanical properties of single-sided bolts in concrete-filled steel tubes mainly focuses on the tensile properties of a single single-sided bolt, lacking the tensile property test research between single-sided bolts with different angles. The main reason is the lack of a tensile property test device applicable to single-sided bolt groups with different angles.

[0063] Based on this, the present application hopes to provide a solution that can solve the above technical problems, and its detailed content will be elaborated in the subsequent embodiments.

[0064] The present invention discloses a multi-angle single-sided bolt group test device. Please refer to Figures 1 to 4。The multi-angle single-sided bolt group test device disclosed by the present invention specifically includes: a mounting assembly 100, a support frame 200, and a stretching assembly 300; wherein, the two mounting assemblies 100 are arranged oppositely, and the interior of the mounting assembly 100 is used for placing concrete-filled steel tubes. Optionally, the number of the mounting assemblies 100 is two, the two mounting assemblies 100 are of a symmetric structure, are spaced apart and located on the same straight line, and the interior is used for bearing the concrete-filled steel tube 10. A plurality of test bolts 20 are arranged in the concrete-filled steel tube 10, forming the entire bolt group; the cross-section of the concrete-filled steel tube 10 is rectangular, circular or elliptical; the material of the steel tube in the concrete-filled steel tube 10 is ordinary steel, high-strength steel or stainless steel, and the concrete material in the concrete-filled steel tube 10 is ordinary concrete or high-strength concrete; the strength grade of the test bolt 20 is 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 (i.e., the bolt property grade for steel structure connection).

[0065] Further, at least one of the support frames 200 is arranged on the mounting assembly 100. Optionally, the support frame 200 is inclined with respect to the horizontal direction; furthermore, a plurality of the stretching assemblies 300 are located circumferentially of the concrete-filled steel tube 10 and are connected to the test bolts 20 in the concrete-filled steel tube 10; wherein, at least one of the stretching assemblies 300 is arranged on the support frame 200, and there is an installation angle between the stretching assembly 300 arranged on the support frame 200 and other stretching assemblies in the circumferential direction of the concrete-filled steel tube 10.

[0066] Specifically, the support frame 200 mainly serves to support the stretching assembly 300, is arranged above the mounting assembly 100, and is in a detachable connection state with the mounting assembly 100. The number of the support frames 200 is the same as the number of the stretching assemblies 300 that need to be connected to the concrete-filled steel tube 10 through the support frame 200. The stretching assembly 300 is mainly used for performing tensile tests on the test bolts 20. There is an installation angle between the stretching assembly 300 arranged on the support frame 200 and other stretching assemblies in the circumferential direction of the concrete-filled steel tube 10. Optionally, the value range of the installation angle is 45°, 60°, 90°, 135° or 150°.

[0067] The specific working principle of the multi-angle single-sided bolt group test device provided in this embodiment is as follows:

[0068] By arranging two installation components 100 in a straight line, then placing the concrete-filled steel tube 10 inside the installation components 100, and further arranging a support frame 200 on the installation components 100, with the support frame 200 inclined to the horizontal direction; arranging two tension components 300 circumferentially around the concrete-filled steel tube 10 and correspondingly connecting them to the test bolts 20 inside the concrete-filled steel tube 10, one of the tension components 300 is arranged on the support frame 200, and the other tension component 300 is arranged in the horizontal direction of the concrete or in other circumferential directions of the concrete. Since the support frame 200 is inclined to the horizontal direction, there is an installation angle between the tension component 300 installed on the support frame 200 and the tension component 300 in the horizontal direction of the concrete or the tension component 300 in other circumferential directions of the concrete, thereby constructing the required angular position for the bolt group tension test, so as to meet the requirements of the unilateral bolt group tension test at different angles.

[0069] The beneficial effects of the multi-angle unilateral bolt group test device provided in this embodiment are at least as follows:

[0070] The multi-angle unilateral bolt group test device in the embodiment of the present invention can realize the multi-angle unilateral bolt group tension test, conduct the tension test on the test bolts 20 at different angles, and the test device is detachable, has clear force transmission, is simple to manufacture, and has good economy.

[0071] As a further solution, please refer to Figure 1 and Figure 5 , the installation component 100 includes: a stopper 110 and a cushion block 120; wherein, an installation hole 111 for placing the concrete-filled steel tube 10 is provided inside the stopper 110, and first connection surfaces 101 and second connection surfaces 102 inclined to the horizontal direction are provided on both symmetric sides of the stopper 110. The first connection surface 101 and the second connection surface 102 are angularly connected, and the angle α between the first connection surface 101 and the horizontal plane is different from the angle β between the second connection surface 102 and the horizontal plane. The stopper 110 is connected to the support frame 200 through the first connection surface 101 or the second connection surface 102; at least one cushion block 120 is arranged on the top surface of the stopper 110, and the side surface of the cushion block 120 facing away from the stopper 110 is a fixed surface 121, and the cushion block 120 is connected to the support frame 200 through the fixed surface 121.

[0072] In the embodiment of the present invention, please refer to Figures 5 to 7, the stopper 110 has a symmetric structure. The material of the stopper 110 is made of steel. An installation hole 111 is made on the inner surface of the stopper 110. The installation hole 111 is a semi-circular surface, and the radian radius of the semi-circular surface is equal to the diameter of the concrete-filled steel tube 10. The top surface of the stopper 110 is a plane, parallel to the horizontal direction. Two different inclined planes, namely the first connection surface 101 and the second connection surface 102, are made on the outer surface of the stopper 110. The first connection surface 101 is connected to the top surface of the stopper 110, and the second connection surface 102 is connected to the first connection surface 101. In addition, the spacer 120 is a wedge-shaped spacer 120, also made of steel. Optionally, the cross-section of the spacer 120 can be an isosceles triangle. It should be noted that in actual use, corresponding-angled spacers 120 can be made according to the different included angles between the test bolts 20 to achieve the test purpose. Among them, the included angle α between the first connection surface 101 and the horizontal direction is 30°, the included angle β between the second connection surface 102 and the horizontal direction is 45°, and the included angle between the fixed surface 121 and the horizontal direction is equal to the included angle α between the first connection surface 101 and the horizontal direction or the included angle β between the second connection surface 102 and the horizontal direction.

[0073] In actual use, since the number of spacers 120 is more than one, and the included angles between the first connection surface 101 and the second connection surface 102 and the horizontal direction are fixed, when the number of spacers 120 changes, the connection surface between the stopper 110 and the support frame 200 will also change. Similarly, changing the number of spacers 120 and changing the connection surface between the stopper 110 and the support frame 200 can change the included angle between the entire support frame 200 and the horizontal direction.

[0074] In some embodiments, please also refer to Figure 1 and Figure 5 , the number of the spacers 120 is one. The included angle α between the first connection surface 101 and the horizontal direction is equal to the included angle between the fixed surface 121 and the horizontal direction. The first connection surface 101 and the fixed surface 121 are respectively connected to the support frame 200.

[0075] Specifically, the included angle α between the first connection surface 101 and the horizontal direction and the included angle between the fixed surface 121 and the horizontal direction are both 30°. Therefore, the plane formed by the first connection surface 101 and the fixed surface 121 can be well-connected to the support frame 200. It can be obtained that the included angle between the support frame 200 arranged on the first connection surface 101 and the fixed surface 121 and the horizontal direction is 60°, that is to say, the included angle between the tensile assembly 300 arranged on the support frame 200 and the tensile assembly 300 arranged in the horizontal direction is 60°, so as to realize the bolt tensile test at two different angles.

[0076] In some other embodiments, please also continue to refer toFigure 5 , Figures 11 to 14 , the number of the cushion blocks 120 is two, and the two cushion blocks 120 are symmetrically arranged on the top surface of the stop block 110. The included angle β between the second connecting surface 102 and the horizontal direction is equal to the included angle between the fixing surface 121 and the horizontal direction, and the second connecting surface 102 and the fixing surface 121 are respectively connected to the support frame 200.

[0077] Specifically, the included angle β between the second connecting surface 102 and the horizontal direction is 45°, and the included angle between the fixing surface 121 on the two cushion blocks 120 and the horizontal direction is also 45°. Therefore, the plane formed by the second connecting surface 102 and the fixing surface 121 can be well connected to the support frame 200, and it can be obtained that the included angle between the support frame 200 arranged on the second connecting surface 102 and the fixing surface 121 and the horizontal direction is 45°. That is to say, the included angle between the stretching assembly 300 arranged on the support frame 200 and the stretching assembly 300 arranged in the horizontal direction is 45°, so as to realize the bolt stretching tests at two different angles.

[0078] Therefore, by means of the first connecting surface 101 or the second connecting surface 102 in the stop block 110, cooperating with the cushion blocks 120 and the support frame 200 with different numbers and angles, different installation included angles are constructed between the stretching assembly 300 and other stretching assemblies in the circumferential direction of the concrete-filled steel tube, that is, the included angles required for the bolt group stretching test (45°, 60°, 90°, 135° or 150°).

[0079] As a further solution, please continue to refer to Figure 1, the support frame 200 includes: a first cross beam 210, a second cross beam 220, and a connecting bolt 230; the first cross beam 210 and the second cross beam 220 are symmetric structures, mainly functioning to support the stretching assembly 300, enabling the stretching assembly 300 mounted on the support frame 200 to be in the horizontal direction or other circumferential directions. Both the first cross beam 210 and the second cross beam 220 are cold-formed equal-leg channel steels. One side of the first cross beam 210 is connected to the fixed surface 121, and the other side of the first cross beam 210 is connected to the stretching assembly 300; the second cross beam 220 is symmetrically arranged with the first cross beam 210, which can preferably play a role in stabilizing the stretching assembly 300. The second cross beam 220 is connected to the first connection surface 101 or the second connection surface 102. When there is one spacer 120, and the angles between the first connection surface 101 and the horizontal direction and between the fixed surface 121 and the horizontal direction are both 30°, then the second cross beam 220 is connected to the first connection surface 101. When there are two spacers 120, and the angle between the second connection surface 102 and the horizontal direction and the angle between the fixed surface 121 and the horizontal direction are 45°, then the second cross beam 220 is connected to the second connection surface 102; the connecting bolt 230 is connected between the first cross beam 210 and the second cross beam 220, so that there is good fixation between the first cross beam 210 and the second cross beam 220 and they are not easily detached.

[0080] As a further solution, please refer to Figure 1 , Figures 8 to 10 , the stretching assembly 300 includes: a displacement gauge backing plate 310, a bolt sleeve 320, a displacement gauge fixing plate 330, a displacement gauge 340, a displacement gauge clamp 350, an extension screw 360, and a hydraulic actuator 370;

[0081] Among them, the displacement gauge backing plate 310 is provided at one end of the test bolt 20 away from the concrete-filled steel tube 10, which plays the role of increasing the contact area, reducing the pressure, and protecting the test bolt 20 and the bolt sleeve 320; the bolt sleeve 320 is provided at one end of the test bolt 20 away from the concrete-filled steel tube 10, and the end of the test bolt 20 is connected to the inner wall of the bolt sleeve 320 (such as threaded connection), and the bolt sleeve 320 abuts against the displacement gauge backing plate 310; the displacement gauge fixing plate 330 is provided at one end of the bolt sleeve 320 away from the test bolt 20, and a displacement gauge fixing groove is provided on the displacement gauge fixing plate 330 (the displacement gauge 340 has been installed in the displacement gauge fixing groove, not labeled in the figure). In addition to playing the same role as the displacement gauge backing plate 310, the displacement gauge fixing plate 330 mainly plays the role of fixing and supporting the displacement gauge 340 through the displacement gauge fixing groove; the displacement gauge 340 is provided on the displacement gauge fixing plate 330 through the displacement gauge fixing groove, and is used to measure the relative displacement between the test bolt 20 and the concrete-filled steel tube 10 to obtain the load-displacement curve of the concrete-filled steel tube 10, so as to judge the strength of the bolt; Optionally, the displacement gauge 340 is a displacement sensor (Linear Variable Differential Transformer, LVDT), and the number of displacement gauges 340 can be multiple, such as four or six, etc. Of course, the specific number of displacement gauges 340 can be set according to requirements.

[0082] Furthermore, the displacement gauge clamp 350 is provided on the displacement gauge fixing plate 330 and is detachably connected to the displacement gauge 340. The displacement gauge clamp 350 effectively clamps the displacement gauge 340 to prevent the displacement gauge 340 from falling off the displacement gauge fixing plate 330, and further fixes the displacement gauge 340; one end of the extension screw 360 passes through the displacement gauge fixing plate 330 and is connected to one end of the bolt sleeve 320 away from the test bolt 20. The extension screw 360 is a high-strength screw, and its diameter and pitch are the same as those of the test bolt 20, and its strength is greater than that of the test bolt 20 to ensure that the test bolt 20 yields and fails before the extension screw 360 during the test loading; for example, the strength of the test bolt 20 is not higher than 10.9 grade, and the strength of the corresponding extension screw 360 is 12.9 grade. In terms of material, 40Cr, 35CrMo, and 42CrMo are commonly used for 10.9 grade; 35CrMo and 42CrMo are used for 12.9 grade bolts. In actual use, the material of the extension screw 360 can be selected as 35# steel or other high-quality materials, and heat treatment can be carried out after manufacturing to improve the strength, and the load that can be borne is larger than that of ordinary bolts of the same specification.

[0083] Even further, please continue to refer to Figure 1, the hydraulic actuator 370 is movably connected to the other end of the extension screw 360, and the hydraulic actuator 370 is also used to connect to the first cross beam 210 and the second cross beam 220. In actual use, the hydraulic actuator 370 is a standardized actively controlled force output device. It pulls the test bolt 20 through the extension screw 360 until the test bolt 20 breaks. It can select a specified stroke and range, and configure a standardized bolt fixture according to the diameter of the extension screw 360. It should be understood that the hydraulic actuator 370 is an existing device, so the specific model and structure of the hydraulic actuator 370 are not described in detail in the present invention.

[0084] It should be noted that the present invention does not elaborate on the specific test process of the multi-angle single-sided bolt group test device.

[0085] As a further solution, please refer to Figure 9 , the displacement gauge fixture 350 includes: a first clamping block 351, a second clamping block 352 and a fixing bolt 353; the first clamping block 351 and the second clamping block 352 are symmetric structures. The first clamping block 351 and the second clamping block 352 are both arranged on the displacement gauge fixing plate 330 and clamped on both sides of the displacement gauge 340. The sides of the first clamping block 351 and the second clamping block 352 facing the displacement gauge 340 are adapted to the outer surface shape of the displacement gauge 340, which can better clamp and fix the displacement gauge 340. The fixing bolt 353 connects the first clamping block 351 and the second clamping block 352, so that there is a good fixation between the first clamping block 351 and the second clamping block 352 and it is not easy to fall off.

[0086] The principle of the multi-angle single-sided bolt group test device provided by the present invention will be further described below in combination with specific usage scenarios:

[0087] In the first aspect, taking the 60° angle required for the bolt group tensile test as an example, that is, the installation angle between the two tensile components is 60°. By arranging the two stoppers 110 on the same straight line, then placing the concrete-filled steel tube 10 in the mounting holes 111 of the stoppers 110, and further arranging a cushion block 120 on the top surface of the stopper 110, a tensile component 300 is arranged horizontally, and the tensile component 300 in the horizontal direction is connected to the test bolt 20 at the corresponding position. Connect the first cross beam 210 to the fixed surface 121, and connect the second cross beam 220 to the first connection surface 101. Since the angles between the first connection surface 101 and the horizontal direction and between the fixed surface 121 and the horizontal direction are both 30°, it can be obtained that the angle between the entire support frame 200 and the horizontal direction is 60°, and the angle between the axis of the tensile component 300 arranged on the first cross beam 210 and the second cross beam 220 and the horizontal direction is also 60°, that is, the installation angle between the tensile component 300 in the horizontal direction and the tensile component 300 on the support frame 200 is 60°.

[0088] In the second aspect, taking the 45° angle required for the bolt group tensile test as an example, that is, the installation angle between the two tensile components is 45°. By arranging the two stoppers 110 on the same straight line, then placing the concrete-filled steel tube 10 in the mounting holes 111 of the stoppers 110, and further arranging two cushion blocks 120 on the top surface of the stopper 110, a tensile component 300 is arranged horizontally, and the tensile component 300 in the horizontal direction is connected to the test bolt 20 at the corresponding position. Connect the first cross beam 210 to the fixed surface 121, and connect the second cross beam 220 to the second connection surface 102. Since the angles between the second connection surface 102 and the horizontal direction and between the fixed surface 121 and the horizontal direction are both 45°, it can be obtained that the angle between the entire support frame 200 and the horizontal direction is 45°, and the angle between the axis of the tensile component 300 arranged on the first cross beam 210 and the second cross beam 220 and the horizontal direction is also 45°, that is, the installation angle between the tensile component 300 in the horizontal direction and the tensile component 300 on the support frame 200 is 45°.

[0089] Please refer to Figure 15 , based on the above multi-angle single-sided bolt group test device, the present invention also discloses an assembly method for a multi-angle single-sided bolt group test device, which includes:

[0090] S100. Place the concrete-filled steel tube 10 inside the installation component 100;

[0091] S200. Place at least one support frame 200 on the installation component;

[0092] S300. Arrange multiple stretching components 300 circumferentially around the concrete-filled steel tube 10, and at least one stretching component 300 is arranged on the support frame 200, so that there is an installation angle between the stretching component 300 arranged on the support frame 200 and other stretching components in the circumferential direction of the concrete-filled steel tube 10.

[0093] In the embodiment of the present invention, by arranging two installation components 100 on the same straight line, then placing the concrete-filled steel tube 10 inside the installation components 100, and further arranging a support frame 200 on the installation components 100, and the support frame 200 is inclined with respect to the horizontal direction; arrange two stretching components 300 circumferentially around the concrete-filled steel tube 10 and correspondingly connect them to the test bolts 20 inside the concrete-filled steel tube 10, one of the stretching components 300 is arranged on the support frame 200, and the other stretching component 300 is arranged in the horizontal direction of the concrete or in other circumferential directions of the concrete. Since the support frame 200 is in an inclined state with respect to the horizontal direction, there is an installation angle between the stretching component 300 installed on the support frame 200 and the stretching component 300 in the horizontal direction of the concrete or the stretching component 300 in other circumferential directions of the concrete, thus constructing the required angular positions for the bolt group tensile test and realizing the tensile test requirements for unilateral bolt groups at different angles.

[0094] It should be understood that since the specific structure of the multi-angle unilateral bolt group test device has been described in detail above, it will not be elaborated here.

[0095] In summary, the present invention provides a multi-angle unilateral bolt group test device and its assembly method. The multi-angle unilateral bolt group test device includes: installation components, a support frame, and stretching components; two installation components are arranged oppositely, and the inside of the installation components is used to place the concrete-filled steel tube; at least one support frame is arranged on the installation components; multiple stretching components are located circumferentially around the concrete-filled steel tube and are connected to the test bolts inside the concrete-filled steel tube; wherein, at least one stretching component is arranged on the support frame, and there is an installation angle between the stretching component arranged on the support frame and other stretching components in the circumferential direction of the concrete-filled steel tube. The present invention arranges two installation components oppositely, then places the concrete-filled steel tube inside the installation components, and further arranges at least one support frame on the installation components; arranges multiple stretching components circumferentially around the concrete-filled steel tube and connects them to the test bolts inside the concrete-filled steel tube, and at least one stretching component is arranged on the support frame, so that there are multiple installation angles required for the test between the multiple stretching components, thus constructing the required angular positions for the bolt group tensile test and realizing the tensile test requirements for unilateral bolt groups at different angles. The multi-angle unilateral bolt group test device in the embodiment of the present invention can realize the multi-angle unilateral bolt group tensile test, solves the problem that it is difficult to arrange the hydraulic actuator obliquely, and is detachable, has clear force transmission, is simple to manufacture, and has good economy.

[0096] Other embodiments of the present invention will be readily apparent to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention following the general principles of the invention and including known common general knowledge or conventional technical means in the technical field not disclosed in this disclosure. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the invention are pointed out by the claims.

Claims

1. A multi-angle single-sided bolt group test device, characterized in that Comprising: Installation components, two of the installation components are arranged oppositely, and the interior of the installation component is used for placing concrete-filled steel tubes; Support frames, at least one of the support frames is arranged on the installation component; Tensile components, a plurality of the tensile components are located circumferentially of the concrete-filled steel tube and are connected to the test bolts inside the concrete-filled steel tube; Wherein, at least one of the tensile components is arranged on the support frame, and there is an installation angle between the tensile component arranged on the support frame and other tensile components in the circumferential direction of the concrete-filled steel tube.

2. The multi-angle single-sided bolt group test device according to claim 1, wherein, The installation component includes: Blocking blocks, the interior of the blocking blocks is provided with installation holes for placing the concrete-filled steel tubes, both symmetric side surfaces of the blocking blocks are provided with a first connection surface and a second connection surface inclined to the horizontal direction, the first connection surface and the second connection surface are angularly connected, and the blocking blocks are connected to the support frame through the first connection surface or the second connection surface; Padding blocks, at least one of the padding blocks is arranged on the top surface of the blocking block, the side surface of the padding block facing away from the blocking block is a fixed surface, and the padding block is connected to the support frame through the fixed surface.

3. The multi-angle single-sided bolt group test device according to claim 2, wherein, The number of the padding blocks is one, The angle between the first connection surface and the horizontal direction is equal to the angle between the fixed surface and the horizontal direction, and the first connection surface and the fixed surface are respectively connected to the support frame.

4. The multi-angle single-sided bolt group test device according to claim 2, characterized in that The number of the padding blocks is two, and the two padding blocks are symmetrically arranged on the top surface of the blocking block; The angle between the second connection surface and the horizontal direction is equal to the angle between the fixed surface and the horizontal direction, and the second connection surface and the fixed surface are respectively connected to the support frame.

5. The multi-angle single-sided bolt group test device according to claim 2, wherein, The support frame includes: The first cross beam, one side of the first cross beam is connected to the fixed surface, and the other side of the first cross beam is connected to the tensile component; The second cross beam, the second cross beam is symmetrically arranged with the first cross beam, and the second cross beam is connected to the first connection surface or the second connection surface; Connection bolts, the connection bolts are connected between the first cross beam and the second cross beam.

6. The multi-angle single-sided bolt group test device according to claim 5, characterized in that, The tensile component includes: Displacement gauge backing plates, the displacement gauge backing plates are arranged on the end of the test bolt facing away from the concrete-filled steel tube; Bolt sleeves, the bolt sleeves are arranged on the end of the test bolt facing away from the concrete-filled steel tube and are abutted against the displacement gauge backing plates; Displacement gauge fixing plates, the displacement gauge fixing plates are arranged on the end of the bolt sleeve facing away from the test bolt, and displacement gauge fixing grooves are provided on the displacement gauge fixing plates; Displacement gauges, the displacement gauges are arranged on the displacement gauge fixing plates through the displacement gauge fixing grooves; Displacement gauge clamps, the displacement gauge clamps are arranged on the displacement gauge fixing plates and are detachably connected to the displacement gauges; Extension screws, one end of the extension screws passes through the displacement gauge fixing plates and is connected to the end of the bolt sleeve facing away from the test bolt; Hydraulic actuators, the hydraulic actuators are movably connected to the other ends of the extension screws, and the hydraulic actuators are also used for connecting to the first cross beam and the second cross beam.

7. The multi-angle single-sided bolt group test device according to claim 6, characterized in that, The displacement gauge clamp includes: The first clamping block, the second clamping block and the fixing bolt; The first clamping block and the second clamping block are both arranged on the displacement gauge fixing plate and clamp the two side surfaces of the displacement gauge, and the fixing bolt is connected to the first clamping block and the second clamping block.

8. The multi-angle single-sided bolt group test device according to claim 3, characterized in that, The included angle between the first connecting surface and the horizontal direction is 30°.

9. The multi-angle single-sided bolt group test device according to claim 4, wherein, The included angle between the second connecting surface and the horizontal direction is 45°.

10. An assembly method of the multi-angle unilateral bolt group test device according to any one of claims 1-9, characterized in that, Comprising: Placing the concrete-filled steel tube inside the installation assembly; Placing at least one support frame on the installation assembly; Placing a plurality of stretching assemblies on the circumference of the concrete-filled steel tube, and at least one stretching assembly is arranged on the support frame, so that there is an installation included angle between the stretching assembly arranged on the support frame and other stretching assemblies on the circumference of the concrete-filled steel tube.

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