Clamp for extrusion anchor pull-out test

Abstract

The utility model relates to the technical field of engineering pre-stress construction and test detection, in particular to a clamp for a pull-out test of an extrusion anchor, which comprises a pre-stress rib, an extrusion anchor head is arranged at one end of the pre-stress rib, a lower sleeve is arranged outside the extrusion anchor head, a clamping rod is arranged at one end of the lower sleeve, and the other end of the clamping rod is provided with a clamping groove. An open groove with an upward opening is formed in the lower sleeve, a plurality of positioning holes are symmetrically formed in the top end of the open groove, positioning rods are arranged in the positioning holes and connected with the upper sleeve, a mounting plate is arranged at one end of the upper sleeve, and a limiting block is arranged at the end, away from the mounting plate, of the upper sleeve. By means of the structure of the sleeve, the positioning hole, the positioning rod, the installation plate, the limiting block and the extrusion pad, the problems that the operation space of the clamp is small, the clamp needs to be operated by holding a cushion block with one hand, and meanwhile the position of a gasket is not fixed, and the gasket is prone to sliding and shifting in the operation process are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering prestressed construction and test detection, in particular to a clamp used for a squeeze anchor pull-out test. Background Art

[0002] Prestressed engineering has been widely used as a means to effectively improve the stiffness of engineering components and increase the durability of components. The application of prestress to engineering components is achieved by tensioning and anchoring the prestressed tendons with anchors, clamps and connectors. According to the anchoring method of the prestressed tendons, anchors, clamps and connectors can be divided into four basic types: clip type, support type, grip type and combination type. The squeeze anchor is one of the grip type anchoring types. The working principle of the extrusion anchor is to insert the extrusion sleeve and the extrusion spring into the steel strand, and fix it on the steel strand by mechanical extrusion. After extrusion, the extrusion spring fragments can be firmly engraved into the steel strand, so that a huge gripping force is formed between the extrusion sleeve and the steel strand. Ensuring the gripping force between the pre-stranded steel strands is a major stress transmission of the quality of the extrusion anchor. In the prior art, when inspecting the quality of the extrusion anchor, it is generally inspected by observing whether the appearance is regular, whether the surface is smooth, whether there are defects such as burrs and burrs, and whether the size meets the requirements. If it is necessary to further inspect the quality of the extrusion anchor, it is necessary to use a special anchor puller to detect the pull-out force, or to use a testing machine to perform a pull-out test. The problem with the above-mentioned detection method is that the use of a special anchor puller to detect the pull-out force of the extrusion anchor head requires the purchase of a puller, and calibration and maintenance are required, which consumes a lot of manpower and material resources, and the operation of the puller is complicated and the safety factor is low. When using a general testing machine for a pull-out test, since one end of the extrusion anchor is a steel sleeve, it is not easy to be clamped by the clamp of the testing machine, so it is difficult to directly use the testing machine to detect the quality of the extrusion anchor.

[0003] And in the application document with the publication number CN211553558U, a clamp for the pull-out test of the extrusion anchor is mentioned. The clamp passes the pad through the prestressed tendon and rests it under the extrusion anchor head. The pad, the extrusion anchor head and part of the prestressed tendon enter the receiving cavity from the opening, and the pad is stuck in the groove. On the one hand, when the pull-out test is carried out, the pad isolates the extrusion anchor head and the stopper, thereby reducing the friction between the two, thereby reducing the damage caused to the extrusion anchor head and the stopper by the pull-out test; on the other hand, the pad is a separate component, which can be replaced in time when damaged, and the replacement and installation are convenient and simple to operate. However, there are still certain defects that need to be optimized. The specific defects are as follows: the clamp has a small operating space and needs to hold the pad with one hand to operate the clamp. At the same time, the position of the gasket is not fixed and it is easy to slide and deviate during operation.

[0004] Therefore, it is particularly important to design a fixture for the extrusion anchor pull-out test to change the above technical defects and improve the overall practicality. Utility Model Content

[0005] The utility model aims to provide a clamp for a squeeze anchor pull-out test to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A clamp for a compression anchor pull-out test, comprising a prestressed tendon, one end of which is provided with an compression anchor head, the outside of which is provided with a lower sleeve, one end of which is provided with a clamping rod, the inside of which is provided with a slot opening upward, the top of which is symmetrically provided with a plurality of positioning holes, the inside of which is provided with a positioning rod, the positioning hole is connected to an upper sleeve, one end of which is provided with a mounting plate, the end of which is away from the mounting plate, a limit block, and a compression pad on one side of the limit block. As a preferred solution of the utility model, the lower sleeve fits with the upper sleeve, one end of which is provided with a limit groove for matching with the limit block, and the limit groove is stepped.

[0008] As a preferred solution of the utility model, a thread groove is provided at the top end of the lower sleeve, and the lower sleeve is installed with the mounting plate through a threaded connection.

[0009] As a preferred solution of the utility model, a plurality of the positioning holes are arranged at equal intervals, and the positioning rods are embeddedly connected to the positioning holes.

[0010] As a preferred solution of the utility model, avoidance grooves for avoiding prestressed tendons are provided inside the limit block and the upper sleeve.

[0011] As a preferred solution of the utility model, cracks are provided on the compression pad to facilitate avoiding the prestressed tendons.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. In the utility model, a clamp for extrusion anchor pull-out test is set up, and the structure of sleeve, positioning hole, positioning rod, mounting plate, limit block and extrusion pad is utilized. The upper sleeve and the lower sleeve are aligned by aligning the arranged positioning rod with the positioning hole, and then the two are installed and fixed by using a threaded rod. When there is still a certain distance between one end of the limit block and the lower sleeve, the extrusion pad is passed through the prestressed tendon, and then the upper sleeve and the lower sleeve are fixed, and the extrusion pad is clamped between the limit block and the limit groove, which solves the problem that the operating space of the clamp is small and one hand is required to hold the pad block to operate the clamp, and the gasket position is not fixed and is easy to slide and deviate during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the entire utility model;

[0015] Figure 2 It is a schematic diagram of the overall disassembly of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the extrusion pad assembly of the utility model.

[0017] In the figure: 1. prestressed tendon; 101. extrusion anchor head; 102. lower sleeve; 103. clamping rod; 104. slot; 105. positioning hole; 106. positioning rod; 2. upper sleeve; 201. mounting plate; 202. limit block; 203. extrusion pad. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively with reference to the relevant drawings below. Several embodiments of the utility model are given. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] For examples, see Figure 1-3 , the utility model provides a technical solution:

[0023] A clamp for a squeeze anchor pull-out test, comprising a prestressed tendon 1, an squeeze anchor head 101 is provided at one end of the prestressed tendon 1, a lower sleeve 102 is provided outside the squeeze anchor head 101, a clamping rod 103 is provided at one end of the lower sleeve 102, a slot 104 with an opening facing upward is provided inside the lower sleeve 102, a plurality of positioning holes 105 are symmetrically provided at the top of the slot 104, a positioning rod 106 is provided inside the positioning hole 105, the positioning rod 106 is connected to an upper sleeve 2, a mounting plate 201 is provided at one end of the upper sleeve 2, a stop block 202 is provided at one end of the upper sleeve 2 away from the mounting plate 201, a squeeze pad 203 is provided on one side of the stop block 202, and the lower sleeve 102 is passed through the squeeze anchor head 10 by fixing the prestressed tendon 1 1 and the prestressed tendon 1, at this time, align the positioning rod 106 with the positioning hole 105, align the upper sleeve 2 with the lower sleeve 102, and then use the threaded rod to install and fix the two, wherein when the upper sleeve 2 passes through the prestressed tendon 1, there is still a certain distance between the tail of the upper sleeve 2, that is, one end of the limit block 202 and the lower sleeve 102, at this time, pass the extrusion pad 203 through the prestressed tendon 1, and then fix the upper sleeve 2 and the lower sleeve 102, the extrusion pad 203 is clamped between the limit block 202 and the limit groove, and then perform a pull-out test, the testing machine clamps the clamping rod 103, if the extrusion anchor head 101 and the prestressed tendon 1 are separated during pulling, the extrusion anchor specimen 101 fails the pull-out test and the quality is unqualified;

[0024] The lower sleeve 102 fits with the upper sleeve 2, and one end of the lower sleeve 102 is provided with a limiting groove for matching with the limiting block 202. The limiting groove is stepped to fix the position of the extrusion pad 203. The top of the lower sleeve 102 is provided with a threaded groove. The lower sleeve 102 and the mounting plate 201 are installed by threaded connection, which is convenient for installing the upper sleeve 2 and the lower sleeve 102. Several positioning holes 105 are arranged at equal intervals, and the positioning rod 106 is embedded with the positioning hole 105 to facilitate rapid positioning of the upper sleeve 2 and the lower sleeve 102. The limiting block 202 and the upper sleeve 2 are provided with avoidance grooves for avoiding the prestressed tendon 1. The extrusion pad 203 is provided with cracks to facilitate avoiding the prestressed tendon 1 and passing the prestressed tendon 1.

[0025] The working process of the utility model is as follows: when using the clamp for the extrusion anchor pull-out test, firstly, under the condition of embedded connection between the positioning rod 106 and the positioning hole 105, fix the prestressed tendon 1, and pass the lower sleeve 102 through the extrusion anchor head 101 and the prestressed tendon 1. At this time, align the positioning rod 106 with the positioning hole 105, and under the condition of matching between the lower sleeve 102 and the upper sleeve 2, align the upper sleeve 2 with the lower sleeve 102, and then, under the condition of threaded connection and installation between the lower sleeve 102 and the mounting plate 201, use the threaded rod to The two are installed and fixed, wherein when the upper sleeve 2 passes through the prestressed tendon 1, there is still a certain distance between the tail of the upper sleeve 2, that is, one end of the limit block 202, and the lower sleeve 102. At this time, the extrusion pad 203 is passed through the prestressed tendon 1, and then the upper sleeve 2 and the lower sleeve 102 are fixed, and the extrusion pad 203 is clamped between the limit block 202 and the limit groove. Then a pull-out test is carried out, and the testing machine clamps the clamping rod 103. If the extrusion anchor head 101 and the prestressed tendon 1 are separated during pulling, the extrusion anchor specimen 101 fails the pull-out test and the quality is unqualified.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixture for a pull-out test of a squeeze anchor, comprising a prestressed tendon (1), characterized in that: One end of the prestressed tendon (1) is provided with an extrusion anchor head (101), the outside of the extrusion anchor head (101) is provided with a lower sleeve (102), one end of the lower sleeve (102) is provided with a clamping rod (103), the inside of the lower sleeve (102) is provided with a slot (104) opening upwards, the top of the slot (104) is symmetrically provided with a plurality of positioning holes (105), the inside of the positioning hole (105) is provided with a positioning rod (106), the positioning rod (106) is connected to the upper sleeve (2), one end of the upper sleeve (2) is provided with a mounting plate (201), the end of the upper sleeve (2) away from the mounting plate (201) is provided with a limit block (202), and one side of the limit block (202) is provided with an extrusion pad (203).

2. A fixture for a squeeze anchor pull-out test according to claim 1, characterized in that: The lower sleeve (102) fits with the upper sleeve (2), and one end of the lower sleeve (102) is provided with a limiting groove for matching with the limiting block (202), and the limiting groove is stepped.

3. A fixture for a squeeze anchor pull-out test according to claim 1, characterized in that: A thread groove is provided at the top end of the lower sleeve (102), and the lower sleeve (102) and the mounting plate (201) are mounted via a threaded connection.

4. A fixture for a squeeze anchor pull-out test according to claim 1, characterized in that: A plurality of the positioning holes (105) are arranged at equal intervals, and the positioning rods (106) are embeddedly connected to the positioning holes (105).

5. A fixture for a squeeze anchor pull-out test according to claim 1, characterized in that: The limiting block (202) and the upper sleeve (2) are provided with avoidance grooves for avoiding the prestressed tendons (1).

6. A fixture for a squeeze anchor pull-out test according to claim 1, characterized in that: The compression pad (203) is provided with a crack to facilitate avoiding the prestressed tendons (1).

Images