Tensioning section fixing structure suitable for prestressed anchor bolt lift-off test

Abstract

This invention relates to the technical field of prestressed anchor bolts and discloses a tensioning section fixing structure suitable for prestressed anchor bolt lift-off tests. The structure includes a prestressed anchor bolt and a lifter. The prestressed anchor bolt includes multiple anchor bars, and the tensioning section of each anchor bar is fixedly connected to an anchor. The tensioning section has an extension section. The lifter includes a telescopic leg and a fixed panel. The telescopic movement of the telescopic leg drives the fixed panel to move relative to the anchor. The fixed panel has multiple through holes, and a fixed gap exists between the outer wall of the extension section and the inner wall of the through holes. A circumferentially elastic ring is inserted into the fixed gap, and the elastic ring hugs and presses against the outer wall of the extension section and the inner wall of the through holes, fixing the extension section relative to the fixed panel. When the telescopic leg extends, it drives the fixed panel and the extension section to move synchronously away from the anchor, thereby achieving the lift-off test and allowing the detection of the holding load of the prestressed anchor bolt.

Description

Technical Field

[0001] This invention relates to the technical field of prestressed anchor bolts, and more specifically, to a tensioning section fixing structure suitable for prestressed anchor bolt lift-off tests. Background Technology

[0002] As an important form of geotechnical engineering reinforcement, prestressed anchor bolt support has been increasingly used in my country's geotechnical engineering field due to its advantages such as safety, efficiency, and low cost.

[0003] A prestressed anchor rod consists of multiple anchor bars, which are anchored in the soil. It has an anchorage section, a free section, and a tensioning section. The anchorage section is anchored in the soil, the free section is in a free-moving state, and the anchor bars are locked by the anchorage through tensioning of the tensioning section.

[0004] The holding load of a prestressed anchor rod, i.e., the load remaining on the anchor rod after tensioning and locking, is one of the important parameters of the prestressed anchor rod and has significant engineering importance. The construction industry typically uses a lift-off test to detect the holding load of prestressed anchor rods. This test is conducted by installing jacks in the tensioning section and performing tensioning.

[0005] In the existing technology, because the tensioning section of the prestressed anchor rod is too short and the anchor is arranged at the same time, it is difficult to arrange the jack and it is impossible to carry out the lifting test for holding load detection. Summary of the Invention

[0006] The purpose of this invention is to provide a tensioning section fixing structure suitable for prestressed anchor bolt lift-off tests, aiming to solve the problem in the prior art that prestressed anchor bolts cannot be subjected to lift-off tests with held loads.

[0007] The present invention is implemented as follows: a tensioning section fixing structure applicable to prestressed anchor rod lift-off test includes a prestressed anchor rod and a lifter set on the soil. The prestressed anchor rod includes multiple anchor bars. The lower part of the anchor bar has an anchoring section anchored in the soil. The middle part of the anchor bar has a free section that is movable in the soil. The upper part of the anchor bar has a tensioning section extending to the outside of the soil.

[0008] The tensioning section is fixedly connected to an anchor, which presses against the soil to fix the tensioned anchor bar; the tensioning section has an extension section extending to the outside of the anchor; the lifting device includes multiple telescopic legs with telescopic length and a fixed panel, the multiple telescopic legs surround the outer periphery of the anchor, the lower ends of the telescopic legs press against the soil, and the upper ends of the multiple telescopic legs are connected to the fixed panel; the telescopic movement of the telescopic legs drives the movement of the fixed panel relative to the anchor;

[0009] The fixed panel has multiple through holes running vertically through it. The extension section passes through the through holes from bottom to top and extends to the outside of the fixed panel. There is a fixed gap between the outer side wall of the extension section and the inner side wall of the through hole. The fixed gap is arranged circumferentially around the extension section.

[0010] An elastic ring with circumferential elastic expansion and contraction is inserted into the fixed gap. The elastic ring is arranged around the outer periphery of the extension section. The elastic ring hugs and presses against the outer side wall of the extension section and the inner side wall of the through hole, fixing the extension section relative to the fixed panel.

[0011] Furthermore, the multiple anchor bars are arranged in a uniformly spaced, surrounding pattern.

[0012] Furthermore, the telescopic leg includes multiple support shafts and multiple hydraulic cylinders; the upper end of the hydraulic cylinder is fixedly connected to the fixed panel, and the hydraulic cylinder is provided with a hydraulic cavity for containing oil and arranged longitudinally; the lower end of the support shaft is fixedly pressed against the soil, and the upper end of the support shaft is movably inserted into the hydraulic cavity through the lower end of the hydraulic cylinder; the hydraulic cavity is connected through a pipeline oil supply device.

[0013] The oil supply device injects or extracts oil into the hydraulic chamber, driving the relative movement of the hydraulic cylinder and the support shaft, thereby realizing the relative movement of the fixed panel relative to the anchor.

[0014] Furthermore, the fixed panel is provided with an inner cavity for containing oil, and the inner cavity is connected to multiple hydraulic chambers respectively; the fixed panel is provided with an oil inlet and an oil outlet, and the oil inlet and the oil outlet are respectively connected to the oil supply equipment through the pipeline.

[0015] Furthermore, the oil inlet and oil outlet are located on the outer periphery of the fixed panel.

[0016] Furthermore, the fixed panel has an annular region located between multiple through holes and multiple hydraulic cylinders, the inner cavity is disposed in the annular region, and the inner cavity is arranged around the annular region; the inner sidewall of the inner cavity is provided with multiple transverse holes, and the multiple transverse holes are respectively connected to multiple hydraulic cylinders.

[0017] Furthermore, the transverse hole is located in the upper part of the inner cavity.

[0018] Furthermore, the elastic ring includes a plurality of fixing pieces, which are arranged in a spaced-around manner; there is an elastic gap between adjacent fixing pieces, and an elastic piece is provided in the elastic gap, with the two sides of the elastic piece respectively fixedly abutting against the sides of two adjacent fixing pieces; the fixing piece has an inner abutting surface facing the outer side wall of the extension section and an outer abutting surface facing the inner side wall of the through hole.

[0019] The lower parts of the plurality of fixing plates are inserted into the annular gap from top to bottom. The inner abutting surface surrounds and presses against the outer wall of the extension section and is fixed relative to the extension section. The outer abutting surface abuts against the inner wall of the through hole and is fixed relative to the through hole. The elastic plate is in a compressed state along the circumference of the elastic ring. The elastic plate abuts against the outer wall of the extension section and the inner wall of the through hole, respectively.

[0020] Furthermore, the bottom of the elastic ring is provided with an elastic bottom ring that is sleeved on the extension section, and the bottom ring is integrally formed with the elastic sheet; the upper end of the bottom ring is connected to the bottom of the elastic ring, and is connected to the bottom of a plurality of fixed sheets and the bottom of a plurality of elastic sheets respectively, and the lower end of the bottom ring extends downward.

[0021] After the elastic ring is fixed in the through hole, the bottom ring has a compression section placed in the through hole and a natural section placed at the bottom of the fixed panel. The diameter of the natural section is larger than the diameter of the compression section. The compression section is in a compressed state and presses against the outer wall of the extension section and the inner wall of the through hole. The natural section presses against the bottom of the fixed panel from bottom to top.

[0022] Furthermore, the side of the fixing piece has a sidewall facing the elastic piece, the sidewall is serrated and forms a plurality of serrated grooves, the plurality of serrated grooves are arranged at intervals along the height direction of the fixing piece; the side of the elastic piece is embedded in the serrated groove and is fixedly connected in the serrated groove.

[0023] Compared with the prior art, the tensioning section fixing structure for prestressed anchor rod lifting test provided by the present invention connects the extension section to the through hole of the fixing panel by arranging elastic rings, and fixes the extension section and the fixing panel relative to each other. When the telescopic leg extends and moves, it drives the fixing panel and the extension section to move synchronously away from the anchor to realize the lifting test. This allows the holding load of the prestressed anchor rod to be detected. The structure is simple and the operation is convenient. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the tensioning section fixing structure for prestressed anchor bolt lifting tests provided by the present invention;

[0025] Figure 2 This is a cross-sectional schematic diagram of the fixed panel and telescopic leg integrated in this invention;

[0026] Figure 3 This is a cross-sectional schematic diagram of the anchor bar provided by the present invention being inserted into the fixed panel and cooperating with the elastic ring;

[0027] Figure 4 This is a top view schematic diagram of the elastic ring provided by the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0030] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] Reference Figure 1-4 The image shown is a preferred embodiment of the present invention.

[0032] A tensioning section fixing structure suitable for prestressed anchor rod lift-off tests includes a prestressed anchor rod and a lifter set on the soil. The prestressed anchor rod includes multiple anchor bars 100. The lower part of the anchor bar 100 has an anchoring section 101 anchored in the soil, the middle part of the anchor bar 100 has a free section movable in the soil, and the upper part of the anchor bar 100 has a tensioning section 102 extending to the outside of the soil.

[0033] The tensioning section 102 is fixedly connected to an anchor 200, which presses against the soil to fix the tensioned anchor bar 100. In this way, the tensioning and locking of the prestressed anchor rod is achieved through the fixing action of the anchor 200.

[0034] The tensioning section 102 has an extension extending to the outside of the anchor 200; the lifting device includes multiple telescopic legs with telescopic extension and a fixed panel 400, the multiple telescopic legs surround the outer periphery of the anchor 200, the lower ends of the telescopic legs press against the soil, and the upper ends of the multiple telescopic legs are connected and fixed to the fixed panel 400; the fixed panel 400 is driven to move relative to the anchor 200 by the telescopic movement of the telescopic legs.

[0035] The fixed panel 400 is provided with a plurality of through holes 403 that extend vertically. The extension section passes through the through holes 403 from bottom to top and extends to the outside of the fixed panel 400. There is a fixed gap between the outer side wall of the extension section and the inner side wall of the through hole 403. The fixed gap is arranged around the circumference of the extension section.

[0036] An elastic ring 500 with circumferential elastic expansion and contraction is inserted in the fixed gap. The elastic ring 500 is arranged around the outer periphery of the extension section. The elastic ring 500 surrounds and presses against the outer side wall of the extension section and the inner side wall of the through hole 403, fixing the extension section relative to the fixed panel 400.

[0037] The tensioning section fixing structure provided above for the prestressed anchor rod lift-off test connects the extension section to the through hole 403 of the fixing panel 400 by arranging elastic rings 500, thus fixing the extension section and the fixing panel 400 relative to each other. When the telescopic leg extends and moves, it drives the fixing panel 400 and the extension section to move synchronously away from the anchor 200 to realize the lift-off test, thereby detecting the holding load of the prestressed anchor rod. The structure is simple and the operation is convenient.

[0038] Multiple anchor bars 100 are arranged in a uniformly spaced ring, which ensures that the multiple anchor bars 100 of the prestressed anchor rod are subjected to uniform force.

[0039] In this embodiment, the telescopic leg includes multiple support shafts 300 and multiple hydraulic cylinders 302; the upper end of the hydraulic cylinder 302 is fixedly connected to the fixed panel 400, and the hydraulic cylinder 302 is provided with a hydraulic cavity 301 for containing oil and arranged longitudinally; the lower end of the support shaft 300 is fixedly pressed against the soil, and the upper end of the support shaft 300 is movably inserted into the hydraulic cavity 301 through the lower end of the hydraulic cylinder 302; the hydraulic cavity 301 is connected through a pipeline oil supply device.

[0040] By injecting or withdrawing oil into the hydraulic chamber 301 through the oil supply device, the hydraulic cylinder 302 and the support shaft 300 are driven to move relative to each other, thereby achieving the relative movement of the fixed panel 400 relative to the anchor 200. When oil is injected into the hydraulic chamber 301, the oil drives the hydraulic cylinder 302 to move away from the support shaft 300, and drives the fixed panel 400 to move away from the anchor 200. When oil is withdrawn from the hydraulic chamber 301, the hydraulic cylinder 302 moves toward the support shaft 300, and drives the fixed panel 400 to move toward the anchor 200.

[0041] In this embodiment, the fixed panel 400 is provided with an inner cavity 404 for containing oil, and the inner cavity 404 is connected to a plurality of hydraulic chambers 301 respectively; the fixed panel 400 is provided with an oil inlet 401 and an oil outlet 402, and the oil inlet 401 and the oil outlet 402 are respectively connected to the oil supply equipment through pipelines.

[0042] The oil inlet 401 and the oil outlet 402 are located on the outer periphery of the fixed panel 400, which facilitates the connection between the oil supply equipment and the oil inlet 401 and the oil outlet 402.

[0043] The fixed panel 400 has an annular region located between multiple through holes 403 and multiple hydraulic cylinders 302. The inner cavity 404 is disposed in the annular region and is arranged around the annular region. The inner sidewall of the inner cavity 404 is provided with multiple transverse holes 405, which are respectively connected to multiple hydraulic cylinders 301.

[0044] After the oil injected by the oil supply equipment enters the inner cavity 404, it flows into the hydraulic cavity 301 through the transverse hole 405. By arranging the inner cavity 404, it is convenient to supply or extract liquid to multiple hydraulic cavities 301. Moreover, the transverse hole 405 is arranged transversely, which can balance the synchronous pressure of multiple hydraulic cavities 301.

[0045] The transverse hole 405 is located at the upper part of the inner cavity 404. This can balance the pressure of multiple hydraulic chambers 301 and avoid the phenomenon of local pressure imbalance in multiple hydraulic chambers 301.

[0046] In this embodiment, the elastic ring 500 includes a plurality of fixing pieces 501, which are arranged in a spaced-around manner; there is an elastic gap between adjacent fixing pieces 501, and an elastic piece 502 is provided in the elastic gap. The two sides of the elastic piece 502 are respectively fixedly connected to the sides of two adjacent fixing pieces 501; the fixing piece 501 has an inner abutting surface facing the outer side wall of the extension section and an outer abutting surface facing the inner side wall of the through hole 403.

[0047] The lower parts of multiple fixing plates 501 are inserted into the annular gap from top to bottom. The inner abutting surface surrounds and presses against the outer wall of the extension section and is fixed relative to the extension section. The outer abutting surface abuts against the inner wall of the through hole 403 and is fixed relative to the through hole 403. The elastic plate 502 is in a compressed state along the circumference of the elastic ring 500. The elastic plate 502 presses against the outer wall of the extension section and the inner wall of the through hole 403 respectively.

[0048] When the elastic ring 500 is inserted into the elastic space, not only do multiple fixing pieces 501 press against the outer wall of the extension section and the inner wall of the through hole 403 to fix the extension section and the fixing panel 400 respectively, but the elastic piece 502 is also compressed and deformed, driving the multiple fixing pieces 501 to be in a state of expansion in the through hole 403. This makes the fit between the elastic ring 500 and the extension section and the through hole 403 more stable, and the compressed elastic piece 502 can further fix the extension section and the through hole 403.

[0049] In this embodiment, the bottom of the elastic ring 500 is provided with an elastic bottom ring that is sleeved on the extension section. The bottom ring is integrally formed with the elastic sheet 502. The upper end of the bottom ring is connected to the bottom of the elastic ring 500 and is connected to the bottom of a plurality of fixing sheets 501 and the bottom of a plurality of elastic sheets 502 respectively. The lower end of the bottom ring extends downward.

[0050] After the elastic ring 500 is fixed in the through hole 403, the bottom ring has a compression section 601 placed in the through hole 403 and a natural section 602 placed at the bottom of the fixed panel 400. The diameter of the natural section 602 is larger than the diameter of the compression section 601. The compression section 601 is in a compressed state and presses against the outer wall of the extension section and the inner wall of the through hole 403. The natural section 602 presses against the bottom of the fixed panel 400 from bottom to top.

[0051] The compression section 601 is placed in the through hole 403 and is in a compressed state, which can make the extension section and the through hole 403 more stable. The natural section 602 is located at the bottom of the fixed panel 400 and forms a step transition with the compression section 601. It can press against the bottom of the fixed panel 400 from bottom to top, further making the extension section and the fixed panel 400 more stable.

[0052] The fixed piece 501 has a sidewall facing the elastic piece 502. The sidewall is serrated, forming multiple serrated grooves, which are spaced apart along the height direction of the fixed piece 501. The sidewall of the elastic piece 502 is embedded in the serrated groove and is fixedly connected therein. This facilitates the connection between the elastic piece 502 and the fixed piece 501, and also facilitates the circumferential compression of the elastic piece by the sidewall of the fixed piece 501, driving the elastic piece 502 to undergo circumferential compression deformation.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tensioning section fixing structure suitable for prestressed anchor bolt lift-off tests, characterized in that, It includes a prestressed anchor rod and a lifting device installed on the soil. The prestressed anchor rod includes multiple anchor bars. The lower part of the anchor bar has an anchoring section anchored in the soil. The middle part of the anchor bar has a free section that is movable in the soil. The upper part of the anchor bar has a tensioning section that extends to the outside of the soil. The tensioning section is fixedly connected to an anchor, which presses against the soil to fix the tensioned anchor bar; the tensioning section has an extension section extending to the outside of the anchor; the lifting device includes multiple telescopic legs with telescopic length and a fixed panel, the multiple telescopic legs surround the outer periphery of the anchor, the lower ends of the telescopic legs press against the soil, and the upper ends of the multiple telescopic legs are connected to the fixed panel; the telescopic movement of the telescopic legs drives the movement of the fixed panel relative to the anchor; The fixed panel has multiple through holes running vertically through it. The extension section passes through the through holes from bottom to top and extends to the outside of the fixed panel. There is a fixed gap between the outer side wall of the extension section and the inner side wall of the through hole. The fixed gap is arranged circumferentially around the extension section. An elastic ring with circumferential elastic expansion and contraction is inserted into the fixed gap. The elastic ring is arranged around the outer periphery of the extension section. The elastic ring hugs and presses against the outer side wall of the extension section and the inner side wall of the through hole, fixing the extension section relative to the fixed panel. The elastic ring includes multiple fixing pieces, which are arranged in a spaced-around manner; there is an elastic gap between adjacent fixing pieces, and an elastic piece is provided in the elastic gap, with each side of the elastic piece being fixedly connected to the side of two adjacent fixing pieces; the fixing piece has an inner abutting surface facing the outer side wall of the extension section and an outer abutting surface facing the inner side wall of the through hole. The lower parts of the plurality of fixing plates are inserted into the annular gap from top to bottom. The inner abutting surface surrounds and presses against the outer wall of the extension section and is fixed relative to the extension section. The outer abutting surface abuts against the inner wall of the through hole and is fixed relative to the through hole. The elastic plate is in a compressed state along the circumference of the elastic ring. The elastic plate abuts against the outer wall of the extension section and the inner wall of the through hole respectively. The bottom of the elastic ring is provided with an elastic bottom ring that is sleeved on the extension section. The bottom ring is integrally formed with the elastic sheet. The upper end of the bottom ring is connected to the bottom of the elastic ring and is connected to the bottom of a plurality of fixed sheets and the bottom of a plurality of elastic sheets respectively. The lower end of the bottom ring extends downward. After the elastic ring is fixed in the through hole, the bottom ring has a compression section placed in the through hole and a natural section placed at the bottom of the fixed panel. The diameter of the natural section is larger than the diameter of the compression section. The compression section is in a compressed state and presses against the outer wall of the extension section and the inner wall of the through hole. The natural section presses against the bottom of the fixed panel from bottom to top.

2. The tensioning section fixing structure for prestressed anchor bolt lift-off tests as described in claim 1, characterized in that, The anchor bars are arranged in a uniformly spaced, circular pattern.

3. The tensioning section fixing structure for prestressed anchor bolt lift-off tests as described in claim 1, characterized in that, The telescopic leg includes multiple support shafts and multiple hydraulic cylinders; the upper end of the hydraulic cylinder is fixedly connected to a fixed panel, and the hydraulic cylinder has a hydraulic cavity for containing oil and arranged longitudinally; the lower end of the support shaft is fixedly pressed against the soil, and the upper end of the support shaft is movably inserted into the hydraulic cavity through the lower end of the hydraulic cylinder; the hydraulic cavity is connected through a pipeline oil supply device. The oil supply device injects or extracts oil into the hydraulic chamber, driving the relative movement of the hydraulic cylinder and the support shaft, thereby realizing the relative movement of the fixed panel relative to the anchor.

4. The tensioning section fixing structure for prestressed anchor bolt lift-off tests as described in claim 3, characterized in that, The fixed panel has an inner cavity for containing oil, which is connected to multiple hydraulic chambers. The fixed panel has an oil inlet and an oil outlet, which are connected to an oil supply device through pipes.

5. The tensioning section fixing structure for prestressed anchor bolt lift-off tests as described in claim 4, characterized in that, The oil inlet and oil outlet are located on the outer periphery of the fixed panel.

6. The tensioning section fixing structure for prestressed anchor bolt lift-off tests as described in claim 4, characterized in that, The fixed panel has an annular region located between multiple through holes and multiple hydraulic cylinders. The inner cavity is set in the annular region and is arranged around the annular region. The inner sidewall of the inner cavity is provided with multiple transverse holes, and the multiple transverse holes are respectively connected to the multiple hydraulic cylinders.

7. The tensioning section fixing structure for prestressed anchor bolt lift-off tests as described in claim 6, characterized in that, The transverse hole is located in the upper part of the inner cavity.

8. The tensioning section fixing structure for prestressed anchor bolt lift-off test as described in claim 1, characterized in that, The side of the fixing piece has a sidewall facing the elastic piece. The sidewall is serrated and has multiple serrated grooves. The multiple serrated grooves are arranged at intervals along the height direction of the fixing piece. The side of the elastic piece is embedded in the serrated groove and is fixedly connected to the serrated groove.

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