Anchorage device clamping device for vertical static load test

Abstract

The utility model provides an anchorage device clamping device for a vertical static load test, which comprises a base, upright posts, a top table and a cross beam, the upright posts are fixedly connected to four corners of the top surface of the base, the top table is fixedly connected to the outer surfaces of the upright posts, the cross beam is fixedly connected to the top ends of the upright posts, and an electric lifting rod is fixedly connected to the top of the top table. The output end of the electric lifting rod is fixedly connected with an upper clamping part, and the middle of the top face of the base is fixedly connected with a lower clamping part. The device has the advantages that compared with a traditional horizontal device, the occupied area of a site is reduced by about 50%, and the space of a laboratory is greatly saved; the test preparation time is shortened from average 2 hours to 40 minutes; the test result error is reduced from about 8% to within 3%, the efficiency and accuracy of the static load anchoring performance test of the anchorage device are remarkably improved, and the prestress engineering quality is powerfully guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of prestressed anchor testing technology, and in particular to an anchor clamping device for vertical static load testing. Background Technology

[0002] In the construction of prestressed concrete structures, the static load anchorage performance of anchorages is directly related to structural safety. Traditional horizontal anchorage static load testing devices have significant shortcomings. They occupy a large horizontal area, and the alignment and adjustment of specimens during test preparation are extremely cumbersome and prone to deviation. During the loading process, there are many force transmission links, resulting in large errors in the test results. They are difficult to meet the current engineering requirements for rapid and accurate testing. Therefore, the development of a new vertical device is of great significance. Utility Model Content

[0003] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0004] Therefore, one objective of this utility model is to propose an anchor clamping device for vertical static load testing, so as to solve the problems mentioned in the background art and overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, one embodiment of the present invention provides an anchor clamping device for a vertical static load test, comprising a base, a column, a top platform, and a crossbeam. The column is fixedly connected to the four corners of the top surface of the base, the top platform is fixedly connected to the outer surface of the column, and the crossbeam is fixedly connected to the top of the column.

[0006] An electric lifting rod is fixedly connected to the top of the platform, and an upper clamping component is fixedly connected to the output end of the electric lifting rod.

[0007] A lower clamping component is fixedly connected to the center of the top surface of the base. A pair of wedge-shaped clamping blocks are built into the grooves at the center of the upper and lower clamping components. The inner surface of the wedge-shaped clamping blocks is covered with fine and regular serrated anti-slip textures.

[0008] Preferably, the base is threaded with anchor bolts at its four corners.

[0009] The above technical solution employs the following: The lower clamping component is rigidly fixed to the center of the base, integrally molded from high-quality cast steel, possessing high strength and excellent wear resistance. Its core structure consists of a pair of opposing wedge-shaped clamping blocks with a wedge angle of 15°, providing an ideal self-locking effect under load. The inner surface of the clamping blocks is covered with fine and regular serrated anti-slip textures, with the texture depth precisely controlled between 0.5-0.8mm and the spacing between adjacent teeth being 2-3mm. This design greatly enhances the friction with the anchor surface, effectively preventing any slippage of the anchor even under high static load conditions. Furthermore, a buffer rubber pad, approximately 5mm thick, is added to the bottom of the lower clamping component, providing cushioning and protection when placing the anchor, preventing damage from collisions with hard metal surfaces. The lower clamping component is commonly used to fix various specifications of conventional anchors, such as those used in small-to-medium span prestressed concrete beams commonly found in construction engineering. Its compact and stable design allows for rapid initial anchor positioning, adapting to the frequent changes in testing samples on construction sites.

[0010] Upper clamping component: The electric lifting rod uses a ball screw structure with a lead set at 10mm. The drive motor is equipped with a high-precision encoder, and the linear displacement accuracy of the lifting rod for one revolution can reach 0.05mm, thus achieving precise control over the lifting and lowering of the upper clamping component. The upper clamping component also has a pair of wedge-shaped clamping blocks, mirror-symmetrical to the clamping blocks of the lower clamping component. When the clamping blocks are closed, the gap tolerance is controlled within ±0.1mm, ensuring uniform force application to different parts of the anchor. The anti-slip texture parameters on the surface of the clamping blocks are consistent with those of the clamping blocks of the lower clamping component 7, ensuring the stability of the overall clamping friction.

[0011] To accommodate various anchorage specifications, the upper clamping component is equipped with fine-tuning screws on both sides. The screw pitch is 1.5mm. Rotating these screws allows for lateral fine-tuning of the clamping block within a certain range, expanding the device's compatibility with different anchorages. The upper clamping component demonstrates its advantages in the inspection of anchorages for large precast box girders in bridge engineering. It allows for flexible fine-tuning and precise adaptation of large-sized, heavy anchorages, ensuring stable clamping.

[0012] During operation, the wedge-shaped clamping blocks of the upper and lower clamping components work together. First, the upper clamping component descends at a constant speed driven by the electric lifting rod, and the clamping blocks gradually fit against the anchor. Relying on the mechanical self-locking of the wedge structure and the friction locking of the anti-slip texture, the anchor is firmly locked, laying a solid foundation for subsequent static load tests. In the field of building engineering, whether it is the prestressed construction of floor slabs in high-rise residential buildings or the prestressed construction of frame beams and columns in large commercial complexes, this clamping mechanism can quickly install and clamp the anchor, efficiently initiate static load tests, and control the quality of components. In bridge construction, from the prestressed construction of giant piers of cross-river and cross-sea bridges to the precast beams of urban viaducts, this device can also accurately clamp the corresponding anchor, simulate real stress scenarios for testing, and build a solid defense for the safety of transportation infrastructure.

[0013] The device mainly consists of a base, a vertical column, a crossbeam and a clamping mechanism. The base is made of thick metal casting, and the bottom is evenly distributed with adjustable foot bolts, which can be flexibly leveled to eliminate the impact of uneven ground. Its plan size is 1200mm long and 800mm wide. The vertical column is made of high-strength alloy steel, with a height of 3000mm, and is vertically fixed to the base 1 by welding to ensure vertical bearing stiffness. The crossbeam 4 is erected on the top of the column and is a I-beam with a length of 1500mm, which is fastened to the column by high-strength bolts.

[0014] 1. Installation preparation

[0015] The device is transported to the test site, the foot bolts are initially rotated, the base is roughly leveled, and then the level is calibrated to ensure that the horizontal error of the base 1 is within 0.1mm / m. Then install the column and crossbeam, tighten the bolts according to the specified torque, and check the structural stability. Test the electric lifting rod for power supply and check its smoothness.

[0016] 2. Test procedure

[0017] Carefully place the anchor to be tested into the lower clamping part, start the electric lifting rod through the operation console, observe the contact process of the upper and lower clamping blocks with the anchor, and turn on the clamping indicator light. Connect the vertical loading device. According to the test standard, gradually apply static load at a preset loading rate (such as 5kN / s), and use high-precision sensors (displacement sensor accuracy 0.01mm, force sensor accuracy 0.1kN) to collect anchor displacement and force data in real time until the test procedure of the specified load and holding time is completed. Finally, operate the electric lifting rod in reverse to release the anchor.

[0018] After multiple comparative tests, the anchor clamping device of the vertical static load test device reduces the site occupation area by about 50% compared to the traditional horizontal device, greatly saving laboratory space; the test preparation time is shortened from an average of 2 hours to 40 minutes; the test result error is reduced from about 8% to within 3%, significantly improving the efficiency and accuracy of anchor static load anchoring performance testing, and effectively guaranteeing the quality of prestressed engineering.

[0019] Preferably, according to any of the above solutions, the base is welded to the column, and the column is riveted to the top table.

[0020] Preferably, according to any of the above solutions, the crossbeam is a I-beam, and the crossbeam is fastened to the column by high-strength bolts.

[0021] Preferably, according to any of the above solutions, the electric lifting rod has a stroke of 500mm and a resolution of 0.05mm, the electric lifting rod uses a ball screw structure with a lead of 10mm, and the drive motor of the electric lifting rod is equipped with a high-precision encoder.

[0022] Preferably, the bottom of the lower clamping component is additionally provided with a buffer rubber pad, and the lower clamping component, the upper clamping component and the wedge-shaped clamping blocks thereon are symmetrically arranged.

[0023] Preferably, the wedge angle of the wedge-shaped clamping block is 15 degrees, and the depth of the sawtooth anti-skid lines is 0.5-0.8 mm, and the interval between adjacent teeth is 2-3 mm.

[0024] Compared with the prior art, the vertical static load test anchor clamping device has the following advantages and beneficial effects:

[0025] The core of the anchor clamping device for vertical static load test is a clamping component, and the core of the lower clamping component and the upper clamping component is a pair of wedge-shaped clamping blocks arranged oppositely, and the wedge angle is designed to be 15 degrees, so that an ideal self-locking effect can be generated under stress. The inner surface of the clamping block is covered with fine and regular sawtooth anti-skid lines, and the depth of the lines is accurately controlled to be between 0.5-0.8 mm, and the interval between adjacent teeth is 2-3 mm. This design greatly enhances the friction force with the surface of the anchor, and even under high load static load, the anchor can be effectively prevented from slipping at all.

[0026] Secondly, compared with the traditional horizontal device, the vertical static load test anchor clamping device has the following advantages: the area of the site occupied is reduced by about 50%, the laboratory space is greatly saved, the test preparation time is shortened from an average of 2 hours to 40 minutes, the test result error is reduced from about 8% to within 3%, and the efficiency and accuracy of the anchor static load anchoring performance test are significantly improved, and the quality of the prestressed engineering is effectively guaranteed.

[0027] Some of the additional aspects and advantages of the present application will be given in the following description, some will become apparent from the following description, or will be understood by those skilled in the art through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0029] Figure 1 It is a structural schematic view of the first perspective of the present application;

[0030] Figure 2 It is a structural schematic view of the second perspective of the present application;

[0031] Figure 3 It is a structural schematic view of the third perspective of the present application;

[0032] Figure 4 It is a structural schematic view of the present application after installing the anchor rod.

[0033] In the diagram: 1-base, 2-column, 3-top platform, 4-beam, 5-electric lifting rod, 6-upper clamping component, 7-lower clamping component, 8-wedge-shaped clamping block, 9-serrated anti-slip texture, 10-anchor rod. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] like Figures 1-4 As shown, the anchor clamping device for this vertical static load test includes a base 1, a column 2, a top platform 3, and a crossbeam 4. The column 2 is fixedly connected to the four corners of the top surface of the base 1, the top platform 3 is fixedly connected to the outer surface of the column 2, and the crossbeam 4 is fixedly connected to the top of the column 2.

[0037] An electric lifting rod 5 is fixedly connected to the top of the top platform 3, and an upper clamping component 6 is fixedly connected to the output end of the electric lifting rod 5.

[0038] A lower clamping component 7 is fixedly connected to the middle of the top surface of the base 1. A pair of wedge-shaped clamping blocks 8 are built into the groove at the center of the upper clamping component 6 and the lower clamping component 7. The inner surface of the wedge-shaped clamping blocks 8 is covered with fine and regular serrated anti-slip textures 9.

[0039] Example 1: The anchor bolts are screwed at the corners of the base 1. The lower clamping part 7 is rigidly fixed at the center of the base 1 and is integrally formed with high-quality cast steel, which has high strength and good wear resistance. Its core structure is a pair of oppositely arranged wedge-shaped clamping blocks 8 with a wedge angle of 15°, which can produce ideal self-locking effect under stress. The inner surface of the clamping block is covered with fine and regular sawtooth anti-slip lines 9, the depth of which is accurately controlled between 0.5-0.8mm, and the distance between adjacent teeth is 2-3mm. This design greatly enhances the friction with the surface of the anchorage device, effectively preventing any slip of the anchorage device even under high static load. In addition, the lower clamping part 7 is additionally provided with a buffer rubber pad at the bottom, with a thickness of about 5mm, which plays a buffering and protective role when placing the anchorage device, avoiding damage to the anchorage device due to collision with the hard metal surface. The lower clamping part 7 is commonly used to fix various specifications of conventional anchorage devices, such as the anchorage devices used in small and medium span prestressed concrete beams commonly used in construction engineering. Its compact and stable design can quickly complete the initial positioning of the anchorage device, adapting to the frequent replacement of detection samples in the construction site.

[0040] Example 2: The upper clamping part 6: The electric lifting rod 5 is selected with a ball screw structure, with a lead of 10mm, and the driving motor is equipped with a high-precision encoder. One rotation corresponds to a linear displacement accuracy of the lifting rod of 0.05mm, so as to realize precise control of the lifting of the upper clamping part 6. The upper clamping part 6 also has a pair of wedge-shaped clamping blocks 8, which are mirror-symmetrical with the clamping blocks of the lower clamping part 7. When the clamping blocks are closed, the gap tolerance is controlled within ±0.1mm, ensuring uniform force on different parts of the anchorage device. The parameters of the anti-slip lines on the surface of the clamping blocks are consistent with those of the clamping blocks of the lower clamping part 7, ensuring the stability of the overall clamping friction. To adapt to various specifications of anchorage devices, the upper clamping part 6 is also provided with micro-adjustment screws on both sides, with a screw pitch of 1.5mm. Rotating the micro-adjustment screw can make the clamping blocks adjust horizontally within a certain range, widening the compatibility of the device to the anchorage device. The upper clamping part has obvious advantages in the detection of large precast box girder anchorage devices in bridge engineering. It can be flexibly adjusted to accurately adapt to large and heavy anchorage devices, ensuring the stability of clamping.

[0041] When working, the wedge-shaped clamping blocks 8 of the upper and lower clamping components cooperate with each other, first, the upper clamping component 6 is driven to descend uniformly by the electric lifting rod 5, the clamping blocks gradually fit the anchorage device, and the anchorage device is firmly locked by mechanical self-locking of the wedge-shaped structure and frictional locking of the anti-skid lines, thereby laying a solid foundation for subsequent static load test. In the field of construction engineering, whether it is the prestressed construction of the floor of high-rise residential buildings or the prestressed construction of the frame beams and columns of large commercial complexes, the clamping mechanism can quickly install and clamp the anchorage device, efficiently open the static load test, and control the component quality. In bridge construction, from the prestressed construction of the giant piers of the cross-river and cross-sea bridges to the precast beam pieces of urban viaducts, the device can also accurately clamp the corresponding anchorage device, simulate the real stress scene detection, and lay a solid defense line for the safety of the traffic infrastructure. The device mainly comprises a base 1, vertical columns 2, a cross beam 4 and a clamping mechanism. The base 1 is made of thick metal casting, and a plurality of adjustable foot bolts are uniformly distributed at the bottom, so that the device can be flexibly leveled and the influence of uneven ground can be eliminated. The planar size is 1200mm in length and 800mm in width. The vertical columns 2 are made of high-strength alloy steel and have a height of 3000mm. The vertical columns 2 are vertically and fixedly connected with the base 1 by welding, so as to ensure the vertical bearing stiffness. The cross beam 4 is arranged on the top of the columns and is a I-beam with a length of 1500mm. The cross beam 4 is fastened with the columns by high-strength bolts. The base 1 is welded with the columns 2, and the columns 2 are riveted with the top table 3. The cross beam 4 is a I-beam, and the cross beam 4 is fastened with the columns 2 by high-strength bolts. The electric lifting rod 5 has a stroke of 500mm and a resolution of 0.05mm. The electric lifting rod 5 is provided with a ball screw structure, and the lead is set to 10mm. The driving motor of the electric lifting rod 5 is provided with a high-precision encoder. The bottom of the lower clamping component 7 is additionally provided with a buffer rubber pad. The lower clamping component 7, the upper clamping component 6 and the wedge-shaped clamping blocks 8 thereon are symmetrically arranged. The wedge angle of the wedge-shaped clamping blocks 8 is designed to be 15 degrees. The anti-skid lines 9 have a depth of 0.5-0.8mm, and the distance between adjacent teeth is 2-3mm.

[0042] The working principle of the utility model is as follows:

[0043] 1. Installation preparation

[0044] The device is carried to the test site, the foot bolts are preliminarily rotated, the base 1 is roughly leveled, then a level is used for calibration, so as to ensure that the horizontal error of the base 1 is within 0.1mm / m. Then the columns 2 and the cross beam 3 are installed, the bolts are tightened according to the specified torque, and the structural stability is checked. The electric lifting rod 5 is tested by electrification, and the lifting smoothness is checked.

[0045] 2. Test process

[0046] The anchor to be tested is carefully placed into the lower clamping part 7, the electric lifting rod 5 is started by operating the control console, the process of the upper and lower clamping blocks contacting the anchor is observed, the clamping indication light is turned on, and the vertical loading device is connected. According to the test standard, the static load is gradually applied at a preset loading rate (such as 5kN / s), the displacement and force data of the anchor are collected in real time by using high-precision sensors (the displacement sensor has an accuracy of 0.01mm, and the force sensor has an accuracy of 0.1kN), until the test process of the specified loading amount and holding time is completed, and finally the electric lifting rod is operated in reverse to release the anchor.

[0047] Through multiple comparative tests, compared with the traditional horizontal device, the anchor clamping device of the vertical static load test occupies an area of about 50% less, greatly saving laboratory space, the test preparation time is shortened from an average of 2 hours to 40 minutes, and the test result error is reduced from about 8% to within 3%, significantly improving the efficiency and accuracy of the anchor static load anchoring performance test, and effectively guaranteeing the quality of prestressed engineering.

[0048] Compared with the prior art, the anchor clamping device of the vertical static load test has the following beneficial effects:

[0049] The anchor clamping device of the vertical static load test, the core is the clamping part, the core of the lower clamping part 7 and the upper clamping part 6 is a pair of wedge-shaped clamping blocks 8 arranged opposite to each other, the wedge angle is designed to be 15°, which can produce ideal self-locking effect under stress. The inner surface of the clamping block is covered with fine and regular sawtooth anti-slip lines 9, the depth of the lines is accurately controlled to be between 0.5-0.8mm, and the distance between adjacent teeth is 2-3mm. This design greatly enhances the friction force with the surface of the anchor, and even in the state of high-load static load, it can effectively prevent the anchor from slipping at all.

[0050] Secondly, compared with the traditional horizontal device, the anchor clamping device of the vertical static load test occupies an area of about 50% less, greatly saving laboratory space, the test preparation time is shortened from an average of 2 hours to 40 minutes, and the test result error is reduced from about 8% to within 3%, significantly improving the efficiency and accuracy of the anchor static load anchoring performance test, and effectively guaranteeing the quality of prestressed engineering.

Claims

1. Anchor clamping device for vertical static load testing, characterized in that, It includes a base (1), a column (2), a top platform (3), and a crossbeam (4). The four corners of the top surface of the base (1) are fixedly connected to the column (2), the top platform (3) is fixedly connected to the outer surface of the column (2), and the top of the column (2) is fixedly connected to the crossbeam (4). An electric lifting rod (5) is fixedly connected to the top of the top platform (3), and an upper clamping component (6) is fixedly connected to the output end of the electric lifting rod (5). The base (1) has a lower clamping component (7) fixedly connected to the middle of its top surface. A pair of wedge-shaped clamping blocks (8) are built into the grooves at the center of the upper clamping component (6) and the lower clamping component (7). The inner surface of the wedge-shaped clamping blocks (8) is covered with fine and regular serrated anti-slip textures (9).

2. The anchor clamping device for vertical static load testing as described in claim 1, characterized in that: Anchor bolts are threaded at the four corners of the base (1).

3. The anchor clamping device for vertical static load testing as described in claim 2, characterized in that: The base (1) is welded to the column (2), and the column (2) is riveted to the top platform (3).

4. The anchor clamping device for vertical static load testing as described in claim 3, characterized in that: The crossbeam (4) is an I-beam, and the crossbeam (4) is fastened to the column (2) by high-strength bolts.

5. The anchor clamping device for vertical static load testing as described in claim 4, characterized in that: The electric lifting rod (5) has a stroke of 500mm and a resolution of 0.05mm. The electric lifting rod (5) adopts a ball screw structure with a lead of 10mm. The drive motor of the electric lifting rod (5) is equipped with a high-precision encoder.

6. The anchor clamping device for vertical static load testing as described in claim 5, characterized in that: The bottom of the lower clamping component (7) is also provided with a buffer rubber pad, and the lower clamping component (7), the upper clamping component (6) and the wedge-shaped clamping block (8) on it are symmetrically arranged.

7. The anchor clamping device for vertical static load testing as described in claim 6, characterized in that: The wedge angle of the wedge-shaped clamp (8) is designed to be 15 degrees, the depth of the serrated anti-slip texture 9 is 0.5-0.8 mm, and the spacing between adjacent teeth is 2-3 mm.

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