Bias test end clamp

Abstract

The utility model belongs to the technical field of concrete bias loading instruments, and particularly relates to a bias test end clamp which comprises a size-adjustable clamping assembly and a pressed plate arranged on the outer surface of the clamping assembly in a sliding mode, and the clamping assembly comprises a fixing plate and an adjusting plate which are arranged along the diagonal line and attached to the edge of a concrete member. The first movable plate and the second movable plate are arranged on the surfaces of the two sides of the adjusting plate in a sliding mode correspondingly, threaded rods are vertically fixed to the two vertical end faces, close to the first movable plate and the second movable plate, of the fixed plate, a supporting plate is fixed to the surface, away from a concrete member, of the fixed plate, and the pressed plate is horizontally arranged on one end face of the supporting plate in a sliding mode. By the adoption of the technical scheme, the problems that the eccentric distance between the loading end and the concrete member cannot be continuously and accurately adjusted in an existing bias experiment, and meanwhile the bias member and the loading plate are difficult to disassemble and assemble can be effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to concrete eccentric pressure loading instrument technical field, concretely relates to a eccentric compression test end clamp. BACKGROUND

[0002] In building, bridge, tunnel and other engineering structures, concrete members (such as columns, walls, etc.) usually bear complex load action, and eccentric compression (i.e. load does not pass through the section centroid of the member) is a common stress state. For example, earthquakes, wind loads or construction errors may cause the member to bear axial compression and bending moment at the same time, thereby forming an eccentric loading condition. At present, the bearing capacity design of concrete members usually relies on the eccentric compression calculation formula in the Code for Design of Concrete Structures, but these theoretical models rely on simplified assumptions (such as the plane section assumption), and the actual stress performance of the member may be affected by factors such as material non-uniformity, reinforcement method and loading eccentricity. Therefore, laboratory eccentric compression test is an important means to verify the actual bearing capacity, ductility and failure mode of the member. For example, Chinese patent discloses a eccentric compression test knife hinge device and eccentric compression test mechanism (patent announcement number: CN208588622U), which cooperates the concave groove of the pressure plate with the convex strip of the loading plate, cooperates the convex circular arc surface with the concave circular arc surface, i.e. transmits the load in the form of surface contact, so as to avoid the significant stress concentration phenomenon caused by the transmission of load in the form of line contact of traditional knife tip, especially suitable for large tonnage eccentric compression test, and to a certain extent, controls the manufacturing cost of the knife hinge device.

[0003] The above technical solution provides an eccentric compression test device, but the end plate and the loading plate are fixed together by bolts and nuts, which cannot realize continuous and accurate eccentricity control, affecting the reliability of test data, and in the eccentric compression test, the eccentric compression member is fixedly connected with the loading plate, which is difficult to disassemble. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model aims to provide an eccentric compression test end clamp to solve the problem that the eccentricity between the loading end and the concrete member cannot be continuously and accurately adjusted, and the eccentric compression member and the loading plate are difficult to disassemble.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] The utility model provides a kind of eccentricity test end clamp, detachably connected in the upper and lower ends of concrete member, including adjustable size clamping assembly and the pressure plate slidingly arranged on the outer surface of clamping assembly, the clamping assembly includes fixed plate and adjusting plate being arranged along diagonal and being attached at the edge of concrete member, and first movable plate and second movable plate are slidingly arranged on the two side surfaces of adjusting plate respectively, the two vertical end faces of fixed plate close to first movable plate and second movable plate are vertically fixed with threaded rod, first movable plate is slidingly arranged along the length direction on the horizontal cross section of concrete member, second movable plate is slidingly arranged along the width direction on the horizontal cross section of concrete member, and the free end of first movable plate and second movable plate respectively passes through the threaded rod adjacent to it and is fixedly connected by nut, the surface of fixed plate away from concrete member is fixed with support plate, the pressure plate is slidingly arranged on the end face of support plate away from fixed plate, and the surface of support plate is provided with screw rod for adjusting the position of pressure plate.

[0007] Further, one side surface of the fixed plate is fixed with a connecting plate abutting against the end surface of the concrete member, the connecting plate is fixedly connected with the support plate by a plurality of bolts, and the surface of the support plate is provided with countersunk holes for placing the bolts.

[0008] Further, the surface of the support plate is provided with two sliders towards the pressure plate, the two sliders are arranged along the length direction of the support plate and are symmetrically arranged about the axis of the length direction of the support plate, and the surface of the pressure plate is provided with a sliding groove matched with the sliders.

[0009] Further, the screw rod is provided with two pieces along the length direction of the support plate, and the two screw rods are respectively arranged on the two side surfaces of the support plate, the size of the pressure plate is greater than that of the support plate, and the lower surface of the pressure plate is fixedly connected with two connecting ears threadedly connected with the screw rods.

[0010] Further, the surfaces of the fixed plate, the first movable plate, the second movable plate and the adjusting plate are covered with a flexible filling material attached to the concrete member.

[0011] The utility model has the advantages that:

[0012] The utility model sets adjustable size clamping assembly on the upper and lower ends of the concrete member, adjusts the distance between the first movable plate, the second movable plate and the adjusting plate, and cooperates with the threaded rod nut and other components and the fixed plate, which not only is convenient to disassemble and assemble, but also can clamp the end part of the concrete member of different sizes within a certain range, effectively improves the application range and efficiency of the clamping assembly, and continuously and accurately adjusts the eccentricity between the pressure groove on the surface of the pressure plate and the concrete member through the pressure plate slidingly arranged on the surface of the support plate and the screw rod for adjusting the position of the pressure plate.

[0013] The other advantages, objects, and features of the present application will become apparent from the following specification, and it is intended to be covered by the following claims, and it will be apparent to those skilled in the art that numerous changes can be made in the application without departing from the basic concepts thereof. The objects and other advantages of the present application will be realized and attained by the embodiments particularly pointed out in the written description and claims hereof. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to make the purposes, technical solutions and beneficial effects of the present application clearer, the present application is described with the following drawings:

[0015] Figure 1 Concrete member and clamping assembly of the present application Figure 1 ;

[0016] Figure 2 Concrete member and clamping assembly of the present application Figure 2 ;

[0017] Figure 3 Clamping assembly of the present application Figure 1 ;

[0018] Figure 4 Clamping assembly of the present application Figure 2 ;

[0019] Figure 5 Concrete member and clamping assembly of the present application

[0020] The symbols in the drawings are as follows:

[0021] 1 concrete member, 2 pressure plate, 3 fixed plate, 4 adjusting plate, 5 first movable plate, 6 second movable plate, 7 threaded rod, 8 sliding rod, 9 supporting plate, 10 screw rod, 11 pressure plate, 12 bearing table, 13 pressure equipment, 14 connecting plate, 15 sliding block. DETAILED DESCRIPTION

[0022] As shown in the drawings, the present application is characterized in that: Figures 1-5

[0023] ​The utility model provides a kind of eccentric test end clamp, detachably connected in the upper and lower ends of concrete member 1, including adjustable clamping assembly and the stressed plate 2 slidingly arranged on the outer surface of clamping assembly, the clamping assembly includes fixed plate 3 and adjusting plate 4 being arranged along diagonal and being attached at the two edges of concrete member 1, and first movable plate 5 and second movable plate 6 slidingly arranged on the two side surfaces of adjusting plate 4 respectively, the horizontal cross section of fixed plate 3 and adjusting plate 4 is all in the shape of "L", the two vertical end faces of fixed plate 3 close to first movable plate 5 and second movable plate 6 are all vertically welded and fixed with threaded rod 7, the two end faces of adjusting plate 4 towards first movable plate 5 and second movable plate 6 are all vertically fixed with three horizontal sliding rods 8, three sliding rods 8 in the same vertical plane are evenly spaced in vertical direction, and the end of each sliding rod 8 away from adjusting plate 4 is slidingly arranged in corresponding first movable plate 5 and second movable plate 6, first movable plate 5 is slidingly arranged along the length direction on the horizontal cross section of concrete member 1, second movable plate 6 is slidingly arranged along the width direction on the horizontal cross section of concrete member 1, and the free end of first movable plate 5 and second movable plate 6 is respectively provided with through hole matched with threaded rod 7, threaded rod 7 passes through corresponding through hole and is fixedly connected therewith by nut, the surface of fixed plate 3 away from concrete member 1 is fixed with support plate 9, the end face of support plate 9 away from fixed plate 3 is detachably and horizontally slidingly arranged with stressed plate 2, stressed plate 2 slides along the length direction of support plate 9, the surface of support plate 9 is provided with lead screw 10 for adjusting the position of stressed plate 2, and stressed plate 2 is threadedly connected with lead screw 10.

[0024] Wherein, the end face of each stressed plate 2 away from concrete member 1 is provided with stress recess, and each stress recess is matched with pressure plate 11 for exerting force thereon, the surface of pressure plate 11 is integrally formed with protrusion abutting against stress recess, pressure plate 11 below concrete member 1 is fixedly connected with bearing table 12 by bolt, bearing table 12 is fixed on the ground, and pressure plate 11 above concrete member 1 is fixed with pressure equipment 13 (only a part of pressure equipment 13 is shown in the figure) by bolt.

[0025] Before the eccentricity test of the concrete component 1, the clamping assemblies need to be fixed and installed at both ends of the concrete component 1. First, the fixed plate 3 and the adjusting plate 4 are placed at two opposite corner edges of one end surface of the concrete component 1, then the first movable plate 5 and the second movable plate 6 are slid, the distance between the first movable plate 5, the second movable plate 6 and the adjusting plate 4 is adjusted, so that the first movable plate 5 and the second movable plate 6 can be adapted to and clamped different sizes of the concrete component 1 within a certain range, and the through holes on the surfaces of the first movable plate 5 and the second movable plate 6 are matched with the adjacent threaded rods 7, then the nuts are screwed and the fixed plate 3, the adjusting plate 4, the first movable plate 5 and the second movable plate 6 are fixed at one end surface of the concrete component 1, and the concrete component 1 is clamped at the same time. Since the support plate 9 is fixedly arranged at one end of the fixed plate 3, the support plate 9 is also fixed on the concrete component 1 at the same time. Then the pressure plate 2 is slidably installed on the surface of the support plate 9, and the pressure plate 2 is threadedly connected with the lead screw 10, so that the pressure plate 2 can be continuously and accurately driven to slide along the length direction of the support plate 9 by rotating the lead screw 10. The centers of the pressure plates 2 at the upper and lower ends of the concrete component 1 need to be in the same vertical direction. When the eccentricity of the stress groove and the concrete component 1 needs to be adjusted, the lead screw 10 needs to be rotated and the positions of the two pressure plates 2 need to be adjusted at the same time. After the clamping assemblies and the pressure plates 2 are fixed at both ends of the concrete component 1, the concrete component 1 is placed between the upper and lower pressure plates 11, and the stress groove is matched with the corresponding protrusion. At this time, the pressure equipment 13 applies a vertical downward pressure, and the eccentric pressure load is applied to the concrete component 1 through the cooperation of the protrusion, the stress groove and other components.

[0026] In the embodiment, one side surface of the fixed plate 3 is integrally formed with a connecting plate 14 abutting against the end surface of the concrete component 1. The size of the connecting plate 14 is smaller than the size of the end surface of the concrete component 1. The connecting plate 14 is fixedly connected with the support plate 9 through four bolts. Screw holes are formed in the surface of the connecting plate 14 to match the bolts. The surface of the support plate 9 is provided with counterbores for placing the heads of the bolts.

[0027] As shown in the drawings, the connecting plate 14 and the support plate 9 are detachably connected through the cooperation of the bolts, which facilitates disassembly and assembly, and facilitates the cooperation of the fixed plate 3 and the pressure plate 2.

[0028] In the embodiment, the surface of the support plate 9 is provided with two sliding blocks 15 facing the pressure plate 2. The vertical cross section of each sliding block 15 is in the shape of “T”. The two sliding blocks 15 are arranged along the length direction of the support plate 9 and are symmetrically arranged about the axis of the length direction of the support plate 9. The surface of the pressure plate 2 is provided with a sliding groove matched with the sliding blocks 15.

[0029] Through the cooperation of the sliding block 15 and the sliding groove, the position of the pressure plate 2 can be adjusted, and a part of the vertical eccentric force exerted by the pressing device 13 on the pressure plate 2 can be transmitted through the sliding block 15.

[0030] In the embodiment, the two screw rods 10 are arranged along the length direction of the support plate 9, and the two ends of each screw rod 10 are rotatably connected to a connecting block fixed to the side surface of the support plate 9. The connecting block is fixed to the support plate 9 by bolts. The pressure plate 2 is larger than the support plate 9 in size, and the lower surface of the pressure plate 2 is fixedly connected to two connecting ears which are threadedly connected to the screw rods 10.

[0031] As shown in the drawings, the two ends of the screw rod 10 are rotatably connected to the connecting block of the support plate 9. When the pressure plate 2 is to be installed on the surface of the support plate 9, the connecting block is first removed, then the sliding groove on the pressure plate 2 is matched with the sliding block 15 on the support plate 9, the screw rod 10 is threadedly connected to the connecting ears, and finally the connecting block is fixed to the support plate 9. The position of the pressure plate 2 is adjusted by rotating the screw rod 10, thereby indirectly adjusting the center distance between the stress groove and the concrete member 1. Meanwhile, a part of the vertical eccentric force exerted by the pressing assembly on the concrete member 1 can be transmitted through the cooperation of the connecting block, the screw rod 10 and the connecting ears, thereby effectively ensuring the transmission of the force.

[0032] In the embodiment, the surfaces of the fixed plate 3, the first movable plate 5, the second movable plate 6, the connecting plate 14 and the adjusting plate 4 are covered with a flexible filling material which is in close contact with the concrete member 1. The flexible filling material can be rubber, and the surface of the flexible filling material is provided with anti-skid stripes, thereby effectively ensuring the stability when the concrete member 1 is fixed.

[0033] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A bias test end clamp, detachably connected to the upper and lower ends of a concrete member (1), comprising a size-adjustable clamping assembly and a pressure plate (2) slidingly arranged on the outer surface of the clamping assembly, characterized in that: The clamping assembly comprises a fixed plate (3) and an adjusting plate (4) arranged diagonally and fitted at the edge of the concrete member (1), and a first movable plate (5) and a second movable plate (6) respectively slidingly arranged on the two side surfaces of the adjusting plate (4), the fixed plate (3) is vertically fixed with a threaded rod (7) near the two vertical end surfaces of the first movable plate (5) and the second movable plate (6), the first movable plate (5) is slidingly arranged along the length direction on the horizontal cross section of the concrete member (1), the second movable plate (6) is slidingly arranged along the width direction on the horizontal cross section of the concrete member (1), and the free ends of the first movable plate (5) and the second movable plate (6) respectively pass through the threaded rod (7) adjacent thereto and are fixedly connected through a nut, the surface of the fixed plate (3) away from the concrete member (1) is fixed with a support plate (9), the pressure plate (2) is slidingly arranged on the end surface of the support plate (9) away from the fixed plate (3), and the surface of the support plate (9) is provided with a lead screw (10) for adjusting the position of the pressure plate (2).

2. An end-of-line bias test fixture according to claim 1, wherein: One side surface of the fixed plate (3) is fixed with a connecting plate (14) abutting against the end surface of the concrete member (1), the connecting plate (14) and the support plate (9) are fixedly connected through a plurality of bolts, and the surface of the support plate (9) is provided with a countersunk hole for placing the bolt.

3. An end-of-line bias test fixture according to claim 2, wherein: The surface of the support plate (9) is provided with two sliding blocks (15) facing the pressure plate (2), the two sliding blocks (15) are arranged along the length direction of the support plate (9) and are symmetrically arranged about the axis of the length direction of the support plate (9), and the surface of the pressure plate (2) is provided with a sliding groove matched with the sliding block (15).

4. An end-of-line bias test fixture according to claim 3, wherein: The lead screw (10) is provided with two pieces along the length direction of the support plate (9), and the two lead screws (10) are respectively arranged on the two side surfaces of the support plate (9), the size of the pressure plate (2) is greater than that of the support plate (9), and the lower surface of the pressure plate (2) is fixedly connected with two connecting ears respectively threadedly connected with the lead screw (10).

5. A biasing test end clamp as defined in claim 1, wherein: The surfaces of the fixed plate (3), the first movable plate (5), the second movable plate (6) and the adjusting plate (4) are covered with a flexible filling material fitted with the concrete member (1).

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