Anchor cable / anchor rod pull-out experiment preposed device

Abstract

The utility model discloses an anchor cable / anchor rod drawing experiment preposed device, which comprises a fixed positioning cylinder inserted and fixed in a side slope, and further comprises a preposed gasket and a contact bottom sheet which are connected with each other, a clamping edge is arranged in an inner cavity of the fixed positioning cylinder, the preposed gasket is clamped and positioned on the clamping edge, and the contact bottom sheet is connected with the preposed gasket. The contact bottom piece is arranged below the front gasket in the mode that the inclination angle can be adjusted, the contact bottom piece is attached to the surface of a slope, and tensioning holes for an anchor cable / anchor rod to penetrate through are formed in the center of the front gasket and the center of the contact bottom piece. According to the anchor cable / anchor rod drawing experiment preposed device, the preposed gasket is positioned and fixed through the fixed positioning cylinder, the positioning stability problem of a soft slope is solved, and the accuracy of soft slope detection data is remarkably improved. The anchor cable / anchor rod drawing experiment preposed device can be adapted to side slopes with different gradients.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of slope engineering, especially relate to a anchor cable / anchor rod fixed test device. BACKGROUND

[0002] In the field of geotechnical engineering and construction, the prefabricated structure has become the mainstream construction form of slope support, foundation pit reinforcement, bridge foundation and other engineering due to the advantages of fast construction speed, easy quality control and high modularization. Among them, the anchor cable as the core component of the prefabricated structure to transfer load, ensure stability and safety, its pull-out performance directly determines the overall reliability of the structure, so the anchor cable pull-out experiment is an indispensable key link in engineering quality control.

[0003] However, the complexity of actual engineering conditions poses a severe challenge to the existing anchor cable pull-out experiment pre-device. From the geological conditions, the types of slopes involved in the engineering differ greatly, covering soft silt soil, loose sand layer to hard rock layer and other geologies, and different geologies have completely different requirements for the positioning stability of the device, especially for soft slopes, the device is prone to sink and deviate in soft slopes, and the existing device lacks targeted positioning structure, which affects the detection accuracy. From the economy and universality, the existing device is mostly fixed structure, and special devices need to be customized for different slope gradients (such as gentle slope, 30° steep slope), and if there is local slope change in the same engineering, the device needs to be replaced many times, resulting in serious material waste and increased engineering cost. These problems together result in poor slope adaptability of the existing anchor cable pull-out experiment pre-device for soft slopes, high cost and difficulty in meeting the demand of engineering for detection accuracy. Therefore, it is of important practical significance to develop an anchor cable pull-out experiment pre-device suitable for different slopes and soft slopes to solve the technical problems of the existing technology. CONTENT OF THE UTILITY MODEL

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies and defects mentioned in the above background technology, and to provide an anchor cable / anchor rod pull-out experiment pre-device suitable for different slopes and soft slopes.

[0005] To solve the above technical problems, the technical scheme provided by the utility model is:

[0006] An anchor cable / anchor rod pull-out experiment pre-device, comprising a fixed positioning cylinder inserted and fixed in a slope, and a pre-pad and a contact bottom sheet connected with each other, a clamping edge is arranged in the inner cavity of the fixed positioning cylinder, the pre-pad is clamped and positioned on the clamping edge, the contact bottom sheet is adjustably arranged below the pre-pad at an inclined angle, and the contact bottom sheet is attached to the surface of the slope, and a tension hole for the anchor cable / anchor rod to pass through is arranged at the center of the pre-pad and the contact bottom sheet.

[0007] Preferably, in the pre-device for anchor cable / anchor rod pull-out test, the pre-pad and the contact base are hinged on one side by a hinged assembly and are provided on the other side with an included angle adjusting assembly for adjusting the included angle between the two. The included angle adjusting assembly can adjust the angle between the pre-pad and the contact base, so that the contact base is attached to the slope surface and the pre-pad is perpendicular to the anchor cable / anchor rod to be tested. This connection mode can improve the application range of the pre-device to the slope and can flexibly adjust the angle according to different slope gradients.

[0008] Preferably, in the pre-device for anchor cable / anchor rod pull-out test, the included angle adjusting assembly is a telescopic rod, the lower end of the telescopic rod is hinged to the upper surface of the contact base, and the upper end of the telescopic rod is arranged on the lower bottom surface of the pre-pad. The telescopic rod can be extended or retracted by screwing to realize stepless adjustment of the extension range of the telescopic rod and to ensure stepless adjustment of the angle between the pre-pad and the contact base. The telescopic rod needs to be made of a material with a certain strength to meet the force requirement in the test process.

[0009] Preferably, in the pre-device for anchor cable / anchor rod pull-out test, the lower bottom surface of the pre-pad is provided with an arc-shaped groove, and the upper end of the telescopic rod is provided with an arc-shaped head matched with the arc-shaped groove. The arc-shaped head can rotate in the arc-shaped groove to adapt to the length and angle changes of the telescopic rod. This arrangement mode does not fixedly connect the upper end of the telescopic rod and the pre-pad, but detachably connects them, which is conducive to storage and, in combination with the detachable design of the hinged assembly, is conducive to the artificial carrying of the pre-pad and the contact base, and is particularly suitable for compact construction spaces, such as narrow foundation pits and steep slope surfaces, where hoisting equipment such as cranes cannot enter. In addition, the fixed positioning cylinder used in the utility model can position the pre-pad and appropriately reduce the weight of the pre-pad, which is conducive to artificial carrying.

[0010] Preferably, in the pre-device for anchor cable / anchor rod pull-out test, the hinged assembly comprises a first hinge seat arranged on one side of the lower bottom surface of the pre-pad and a second hinge seat arranged on one side of the upper surface of the contact base, and the first hinge seat and the second hinge seat are detachably hinged by a hinge shaft. The first hinge seat and the second hinge seat can be separated by pulling out the hinge shaft, so that the pre-pad and the contact base are separated, which is conducive to the artificial carrying of the two.

[0011] Preferably, in the pre-device for anchor cable / anchor rod pull-out test, the fixed positioning cylinder is of a split structure and is composed of multiple arc-shaped segments. The fixed positioning cylinder is of a split structure, which is conducive to artificial carrying and reduces the weight of each carrying.

[0012] Preferably, the inner diameter of the fixed positioning cylinder and the outer diameter of the front pad are matched, and the outer diameter of the contact bottom sheet is smaller than the inner diameter of the fixed positioning cylinder. The fixed positioning cylinder is used for positioning the front pad, and therefore, the inner diameter of the fixed positioning cylinder and the outer diameter of the front pad are matched. The contact bottom sheet is placed in the inner side of the fixed positioning cylinder, and therefore, the outer diameter of the contact bottom sheet is smaller than the inner diameter of the fixed positioning cylinder.

[0013] Preferably, the edge of the upper surface of the front pad is symmetrically provided with a carrying handle. The carrying handle is beneficial to the carrying of the front pad.

[0014] The anchor cable / anchor rod pulling experiment pre-positioning device of the utility model, each component cooperates to realize the complete function of positioning, angle adjustment, fixing and experiment connection. The fixed positioning cylinder can be made of stainless steel and has an arc petal structure, such as three petals. The inner diameter of the three petals is matched with the diameter of the front pad. For soft silt soil, loose sand layer and other soft slopes, the fixed positioning cylinder can be hammered into the slope soil by artificial or small tools. The structural strength of the fixed positioning cylinder is used to realize the preliminary positioning of the device, avoid the device from sinking or deviating in subsequent operation, and provide a stable foundation for subsequent component assembly. The front pad can also be made of stainless steel and has a tension hole matched with the diameter of the anchor cable / anchor rod in the middle. The hole diameter is determined according to the actual anchor cable / anchor rod specification, so as to ensure that the anchor cable / anchor rod passes through smoothly without excessive gap. The hole diameter needs to ensure that the contact bottom sheet angle adjustment process does not affect the straight line state of the anchor cable / anchor rod. The front pad is in the form of a short cylinder, and the thickness is controlled within 6-10 cm. The specific value is determined according to the anchor cable / anchor rod pulling experiment design load. The thickness is preferably 8 cm under conventional working conditions, the diameter is 15-25 cm, and the diameter is preferably 20 cm. The diameter can be adjusted according to the diameter of the anchor cable / anchor rod and the experimental requirements. The front pad is used as the core bearing and connecting component of the device. The upper surface is used for connecting the pulling experiment equipment, the lower surface is connected with the contact bottom sheet through the included angle adjustment assembly and the hinged assembly, and the outer wall is matched with the clamping edge of the inner wall of the fixed positioning cylinder to realize tight clamping and fixing, thereby further improving the overall stability of the device.

[0015] The contact base plate can be made of stainless steel, and a tension hole matching the diameter of the anchor cable / anchor rod is formed in the middle. The diameter of the hole is determined according to the actual anchor cable / anchor rod specifications to ensure that the anchor cable / anchor rod passes through smoothly without excessive gap. The diameter needs to ensure that the contact base plate does not affect the straightness of the anchor cable / anchor rod during angle adjustment. The contact base plate is connected to the front gasket through the included angle adjustment assembly and the hinged assembly. The telescopic rod adopts a threaded adjustment structure, and the length adjustment range is 10-30 cm. The length of the telescopic rod can be adjusted by rotating it, which in turn drives the contact base plate to rotate, allowing the contact base plate to closely fit the surface of the slope with different slopes in the range of 0-60°. The clamping edge is provided on the inner wall of the fixed positioning cylinder, and the width of the clamping edge is 2-3 cm. When the front gasket is placed in the frame formed by the arc-shaped petal structure, the two can be tightly clamped to prevent horizontal displacement of the device during the experiment. The carrying handle is made of stainless steel and is welded to the side of the front gasket. Two are symmetrically arranged on each side, which facilitates manual carrying, assembly and disassembly of the device, and completely eliminates the dependence on large equipment such as cranes. Even in a compact construction space, efficient operation can be achieved.

[0016] The working process of the anchor cable / anchor rod pull-out test pre-device is as follows: first, determine the assembly steps according to the geological type and slope of the site slope. For soft slopes, first evenly drive the fixed positioning cylinder into the slope soil, and control the driving depth to be 10-15 cm according to the looseness of the soil to ensure the stability of the fixed positioning cylinder. Then, carry the pre-device through the carrying handle, adjust the length of the telescopic rod according to the slope of the slope, and make the contact base plate completely fit the surface of the slope. During the adjustment process, a slope gauge can be used to assist in calibration to ensure that the fitting angle error is not more than 1°. Then, slowly place the front gasket into the fixed positioning cylinder to make the two completely clamped, and complete the overall fixation of the device. Finally, pass one end of the anchor cable / anchor rod to be tested through the tension hole of the front gasket and the contact base plate (try to make the anchor cable / anchor rod perpendicular to the front gasket), connect the pull-out test equipment, and the detection work can be carried out. After the experiment is completed, the front gasket is pulled out upward through the carrying handle, and then the fixed positioning cylinder is taken out. After cleaning the soil or impurities on the surface of the parts, they can be transported to other working conditions for repeated use.

[0017] All components in the anchor cable / anchor rod pull-out test pre-device can be made of stainless steel, which has strong corrosion resistance and long service life. It can be repeatedly used in multiple projects, meets the green construction and economic needs, and plays an important role in improving the efficiency and reliability of the assembly type structure anchor cable / anchor rod pull-out test.

[0018] Compared with the prior art, the pre-device has the following advantages:

[0019] The anchor cable / anchor rod pull-out test preposition device of the utility model, through fixed positioning cylinder realizes the positioning fixation of preposition gasket, solves the positioning stability problem of soft side slope, and the device displacement amount can be controlled within 2mm in the experiment process, and the accuracy of soft side slope detection data is improved significantly.

[0020] The anchor cable / anchor rod pull-out test preposition device of the utility model, the contact bottom sheet is arranged below the preposition gasket in an adjustable inclination angle, and can be adapted to side slopes with different slopes, and without the need of customizing special devices, the customization cost of a single device can be reduced by more than 70%. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0022] Fig. 1 It is a sectional structure schematic view of the anchor cable / anchor rod pull-out test preposition device in the embodiment.

[0023] Fig. 2 It is a connection structure schematic view of the preposition gasket and the contact bottom surface in the embodiment.

[0024] Fig. 3 It is a structure schematic view of the fixed positioning cylinder in the embodiment.

[0025] LEGEND

[0026] 1, preposition gasket; 11, arc-shaped groove; 2, included angle adjusting assembly; 21, arc-shaped head; 3, tension hole; 4, contact bottom sheet; 5, carrying handle; 6, clamping edge; 7, hinged assembly; 8, fixed positioning cylinder. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively and carefully in the following with the aid of the drawings and the preferred embodiments of the specification, but the protection scope of the utility model is not limited to the following specific embodiments.

[0028] It should be particularly pointed out that when a certain element is described as being "fixed to, fixedly connected to, connected to or communicated to" another element, it can be directly fixed, fixedly connected, connected or communicated to another element, or indirectly fixed, fixedly connected, connected or communicated to another element through other intermediate connecting pieces.

[0029] Unless otherwise defined, all terms used in the description, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. The terms used in the description are only for the purpose of describing specific embodiments and are not intended to limit the scope of the present application.

[0030] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or prepared by existing methods.

[0031] Embodiment:

[0032] As shown in Figs. 1-3 , the anchor cable / anchor rod pull-out test pre-positioning device of the embodiment includes a fixed positioning cylinder 8 inserted and fixed in the slope, and further includes a pre-positioning gasket 1 and a contact bottom sheet 4 connected with each other. The fixed positioning cylinder 8 is provided with a clamping edge 6 in the inner cavity. The pre-positioning gasket 1 is clamped and positioned on the clamping edge 6. The contact bottom sheet 4 is provided below the pre-positioning gasket 1 in a manner that the inclination angle thereof is adjustable, and the contact bottom sheet 4 is attached to the surface of the slope. The pre-positioning gasket 1 and the contact bottom sheet 4 are provided with a tension hole 3 in the center thereof for the anchor cable / anchor rod to pass through.

[0033] As shown in Fig. 2 , in the embodiment, one side of the pre-positioning gasket 1 and the contact bottom sheet 4 is hinged through a hinge assembly 7, and the other side is provided with an included angle adjusting assembly 2 for adjusting the included angle of the two. The included angle adjusting assembly 2 is a telescopic rod. The lower end of the telescopic rod is hinged to the upper surface of the contact bottom sheet 4, and the upper end of the telescopic rod is provided on the lower bottom surface of the pre-positioning gasket 1. The lower bottom surface of the pre-positioning gasket 1 is provided with an arc-shaped groove 11, and the upper end of the telescopic rod is provided with an arc-shaped head 21 matched with the arc-shaped groove 11. The hinge assembly 7 includes a first hinge seat provided on one side of the lower bottom surface of the pre-positioning gasket 1 and a second hinge seat provided on one side of the upper surface of the contact bottom sheet 4. The first hinge seat and the second hinge seat are detachably hinged through a hinge shaft.

[0034] As shown in Fig. 3 , in the embodiment, the fixed positioning cylinder 8 is of a split structure and is combined by three arc-shaped segments. In other embodiments, arc-shaped segments with other numbers of segments can also be combined.

[0035] In the embodiment, the inner diameter of the fixed positioning cylinder 8 and the outer diameter of the pre-positioning gasket 1 are matched, and the outer diameter of the contact bottom sheet 4 is smaller than the inner diameter of the fixed positioning cylinder 8.

[0036] In the embodiment, the edge of the upper surface of the pre-positioning gasket 1 is symmetrically provided with a carrying handle 5.

[0037] In order to make the structure, assembly process and actual application effect of the embodiment more clear, the implementation process and application effect of the device are described in detail as follows in combination with the specific working condition of “soft sandy slope anchor cable pull-out test with a slope of 30°”:

[0038] First, the component preparation, all metal parts are selected with 304 stainless steel material, to ensure corrosion resistance and structural strength; the thickness of the front gasket 1 is set to 8 cm, the diameter is 20 cm, which is suitable for the diameter of 20 mm anchor cable in this project; the initial length of the telescopic rod is 15 cm, the adjustment range is 10-30 cm, and the screw adjustment accuracy is 1 mm; the arc of the three-lobed arc segment single lobe is 120°, the height is 30 cm, and the width of the clamping edge 6 is 2.5 cm; the carrying handle 5 is made of stainless steel strip with a diameter of 10 mm and a length of 15 cm, and two are symmetrically welded on each side.

[0039] In the field assembly stage, first confirm the slope gradient to be 30° by the slope instrument, and the geology is soft sandy soil. First, install the three-lobed arc segment: use a small impact hammer to evenly hit the three-lobed arc segment into the slope soil, the hitting depth is controlled within 12 cm, to ensure that the three-lobed arc segment is vertical and stable, and the spacing error between adjacent three-lobed arc segments is not more than 5 mm. Then adjust the angle of the contact bottom sheet 4: the worker holds the carrying handle 5 on the side of the front gasket 1, rotates the threaded structure of the telescopic rod, and adjusts the length of the telescopic rod to 22 cm. At this time, the contact bottom sheet 4 rotates to 30° around the hinge assembly 7, and is completely attached to the slope surface. Through the slope instrument for secondary calibration, it is confirmed that the attachment angle error is 0.5°, which meets the requirements.

[0040] Then fix the device: slowly put the adjusted front gasket 1 into the frame composed of three-lobed arc segments, make sure that the front gasket 1 is clamped in the fixed positioning cylinder 8, and then complete the overall fixation after confirming that there is no looseness by gently pushing the front gasket 1. Finally, connect the experimental equipment: pass one end of the diameter 20 mm anchor cable to be tested through the tension hole 3 between the contact bottom sheet 4 and the front gasket 1, fill the gap between the anchor cable and the tension hole 3 with a rubber gasket to prevent sand from entering during the experiment, and then connect the pull-out testing machine. According to the specification, apply tension and record experimental data.

[0041] After the experiment, the worker pulls out the front gasket 1 upward through the carrying handle 5, removes the three-lobed arc segment with tools, cleans the sand particles on the surface of the components, and then transports them to another slope with a gradient of 45° in this project.

[0042] The application effect of this embodiment shows that the device assembly time only needs 35 minutes, which is shortened by 60% compared with the traditional device relying on the crane; the device displacement during the experiment is 1.2 mm, the deviation of the detection data from the standard value is 3.5%, which meets the engineering detection accuracy requirement that the allowable deviation is ≤10%; single device avoids the customization of multiple devices for different slopes, saving about 3000 yuan in cost, and can be reused in subsequent projects, fully reflecting the advantages of the device such as multi-working condition adaptation, convenient installation, economy and environmental protection, which is suitable for anchor cable pull-out experimental detection needs of various assembled structures.

[0043] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pre-device for anchor cable / anchor rod pull-out test, characterized in that, The utility model relates to a slope protection device, which comprises a fixed positioning cylinder (8) inserted and fixed in a slope, a front pad (1) and a contact bottom sheet (4) connected with each other, a clamping edge (6) arranged in the inner cavity of the fixed positioning cylinder (8), the front pad (1) is clamped and arranged on the clamping edge (6), the contact bottom sheet (4) is arranged below the front pad (1) in an adjustable inclination angle, the contact bottom sheet (4) is attached to the surface of the slope, and the center of the front pad (1) and the contact bottom sheet (4) is provided with a tension hole (3) for the anchor cable / anchor rod.

2. The anchor cable / anchor rod pull-out test pre-device according to claim 1, characterized in that, One side of the front pad (1) and the contact bottom sheet (4) is hinged through a hinge assembly (7), and the other side is provided with an included angle adjusting assembly (2) for adjusting the included angle of the two.

3. The anchor cable / anchor rod pull-out test pre-installation device according to claim 2, characterized in that, The included angle adjusting assembly (2) is a telescopic rod, the lower end of the telescopic rod is hinged to the upper surface of the contact bottom sheet (4), and the upper end of the telescopic rod is arranged on the lower bottom surface of the front pad (1).

4. The anchor cable / anchor rod pull-out test pre-installation device according to claim 3, characterized in that, The lower bottom surface of the front pad (1) is provided with an arc-shaped groove (11), and the upper end of the telescopic rod is an arc-shaped head (21) matched with the arc-shaped groove (11).

5. The anchor cable / anchor rod pull-out test pre-installation device according to claim 2, characterized in that, The hinge assembly (7) comprises a first hinge seat arranged on one side of the lower bottom surface of the front pad (1) and a second hinge seat arranged on one side of the upper surface of the contact bottom sheet (4), and the first hinge seat and the second hinge seat are detachably hinged through a hinge shaft.

6. The anchor cable / anchor rod pull test pre-installation device of claim 1, wherein, The fixed positioning cylinder (8) is a split structure combined by multiple arc-shaped segments.

7. The anchor cable / anchor rod pull test pre-installation device of claim 1, wherein, The inner diameter of the fixed positioning cylinder (8) is matched with the outer diameter of the front pad (1), and the outer diameter of the contact bottom sheet (4) is smaller than the inner diameter of the fixed positioning cylinder (8).

8. The anchor cable / anchor rod pull test pre-installation device of claim 1, wherein, The edge of the upper surface of the front pad (1) is symmetrically provided with a carrying handle (5).

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