Pre-stressed anchor cable for foundation pit supporting

Abstract

The invention discloses a pre-stressed anchor cable for foundation pit supporting and relates to the technical field of anchor cable devices.The pre-stressed anchor cable comprises an inner anchor head, a plurality of anchor cable bodies are installed on the upper portion of the inner anchor head, the ends, away from the inner anchor head, of the anchor cable bodies are jointly and movably connected with an outer anchor head, a square plate is installed on the outer side of the outer anchor head, and installation plates are installed on the two sides of the square plate; the mounting plate is in threaded connection with the connecting bolt, a wrapping assembly for the mounting plate is arranged on the square plate, the wrapping assembly comprises movable plates symmetrically arranged on the anchor cable body in a sliding mode and protective plates movably connected to the movable plates, and the protective plates can wrap the connecting bolt; the inner anchor head can be firmly fixed in a hole through the stabilizing assembly, so that the stable supporting effect is provided, the pulling force or pressure borne by the inner anchor head can be dispersed, and the anchoring force of the whole device is improved; the stabilizing assembly used for the inner anchor head is arranged on the inner side of the inner anchor head.

Description

Technical Field

[0001] The invention relates to the technical field of anchor cable devices, and in particular to a prestressed anchor cable used for foundation pit support. Background Art

[0002] Prestressed anchor cable for foundation pit support is an important engineering structure. Prestressed anchor cable refers to a cable-shaped bracket that uses prestressing method to anchor the anchor cable inside the rock body, which is used to reinforce the slope or foundation pit support. It anchors steel strands or steel bars and other materials into the rock body through the anchor head to form a stable support structure. The prestressed anchor cable is mainly composed of anchor head, anchor cable body and external anchor head.

[0003] After searching, the invention patent with Chinese patent number CN116357364A discloses a recyclable prestressed anchor cable. Compared with the prior art, the invention patent with Chinese patent number CN116357364A can achieve support for slopes, inner walls of foundation pits, mines and other parts. The support and recovery principles are simple, the production is easy, the structure is simple, the operation is convenient, and the recovery is easy. It can be recycled many times, which improves the use value of the anchor cable.

[0004] However, in actual use, the above-mentioned device is fixedly connected by pouring concrete after the anchor head is inserted into the hole in the soil. However, after a long period of load, it is easy to loosen, thereby affecting the stability during use. In addition, the connecting parts between the outer anchor head and the wall are mostly directly exposed to the outside and are easily corroded or loosened by external forces, thereby affecting the use of the device. Therefore, a prestressed anchor cable for foundation pit support is proposed. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that the anchor head is inserted into a hole in the soil and then fixedly connected by pouring concrete, but it is easy to loosen due to long-term load, and the connecting parts are directly exposed to the outside and are easily corroded or loosened by external forces. A prestressed anchor cable for foundation pit support is proposed to solve the problems that the anchor head is inserted into a hole in the soil and fixedly connected by pouring concrete, but it is easy to loosen due to long-term load, and the connecting parts are directly exposed to the outside and are easy to be corroded or loosened by external forces.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A prestressed anchor cable for foundation pit support, comprising an inner anchor head, a plurality of anchor cable bodies are installed on the upper part of the inner anchor head, an outer anchor head is movably connected to the ends of the plurality of anchor cable bodies away from the inner anchor head, a square plate is installed on the outer side of the outer anchor head, mounting plates are installed on both sides of the square plate, the mounting plates are threadedly connected to connecting bolts, a wrapping assembly for the mounting plates is arranged on the square plate, the wrapping assembly comprises a movable plate symmetrically slidably arranged on the anchor cable body, and a protective plate movably connected to the movable plate, and the protective plate can wrap the connecting bolts;

[0008] A stabilizing assembly for the inner anchor head is provided on the inner side of the inner anchor head, and the stabilizing assembly includes a first extension rod symmetrically and movably connected to the inner side of the inner anchor head, an extrusion block movably connected to the inner side of the inner anchor head, and a second extension rod movable inside the first extension rod, the first extension rod and the second extension rod move in opposite directions through the up and down movement of the extrusion block, a connecting plate is installed on the upper part of the extrusion block, a pull rope is installed on the side of the connecting plate away from the extrusion block, and the pull rope is movably connected to the outer anchor head.

[0009] The above technical solution further includes:

[0010] A first telescopic rod and a first spring are symmetrically installed on the inner side of the inner anchor head, a first fixing plate is installed on one end of the first telescopic rod and the first spring close to the extrusion block, the first fixing plate is fixedly connected to the first extension rod, a first opening groove is symmetrically opened on the inner side of the inner anchor head, the first opening groove is slidably connected to the first extension rod, and the size of the opening of the first opening groove is adapted to the size of the first extension rod.

[0011] A second spring and a second telescopic rod are installed on the inner side of the inner anchor head. The second spring and the second telescopic rod are fixedly connected to the extrusion block at one end close to the first extension rod. The inner anchor head can be firmly fixed in the hole, thereby providing a stable support effect, which can disperse the tension or pressure on the inner anchor head, thereby improving the anchoring force of the entire device.

[0012] A third opening groove is provided on the inner side of the first extension rod, and the second extension rod is slidably arranged on the inner side of the third opening groove. A pressure block is installed on the end of the second extension rod close to the extrusion block, and a third spring is installed between the second extension rod and the inner side of the third opening groove. The contact area between the first extension rod and the soil is increased through the second extension rod, thereby improving the bearing capacity of the first extension rod and being able to withstand a larger load.

[0013] The cross sections of the extrusion block, the first extension rod and the pressure block are all trapezoidal, and the two first extension rods and the pressure block are all located above the cross section of the extrusion block.

[0014] The size of the opening of the third opening slot is matched with the size of the second extension rod, and the cross-sections of the third opening slot and the second extension rod are both L-shaped.

[0015] A second opening groove is provided on both sides of the anchor cable body, and the movable plate is slidably arranged on the inner side of the second opening groove. A third telescopic rod and a fourth spring are installed on the upper part of the movable plate, and a second fixed plate is installed on the side of the protective plate close to the movable plate. The third telescopic rod and the fourth spring are fixedly connected to the second fixed plate together, providing an additional fixing layer for the connecting bolts, which helps to prevent loosening due to external force, thereby helping to maintain the stability of the device.

[0016] The upper part of the square plate is symmetrically provided with sliding grooves, a sliding plate is slidably arranged inside the sliding groove, the sliding plate is fixedly connected to the movable plate, a fifth spring is installed on the side of the sliding plate, and the side of the fifth spring away from the sliding plate is fixedly connected to the inner wall of the sliding groove.

[0017] A threaded ring is installed on the upper part of the outer anchor head, the threaded ring is threadedly connected to the threaded cap, and the threaded cap is rotatably connected to the pull rope, which is conducive to pulling the pull rope with effort.

[0018] The cross section of the contact portion between the protective plate and the connecting bolt when being squeezed is trapezoidal.

[0019] The present invention has the following beneficial effects:

[0020] 1. In the present invention, the inner anchor head can be firmly fixed in the hole through the stabilizing assembly, thereby providing a stable support effect, which can disperse the tension or pressure on the inner anchor head, thereby improving the anchoring force of the entire device, and the contact area between the first extension rod and the soil is increased through the second extension rod, thereby improving the bearing capacity of the first extension rod and being able to withstand a larger load.

[0021] 2. In the present invention, the connecting bolts are protected from corrosion by the external environment, such as rain, moisture, dust and chemical substances, by wrapping the components, so that the device itself is suitable for harsh environments, and an additional fixing layer is provided for the connecting bolts by the protective plate, which helps to prevent loosening due to external forces, thereby helping to maintain the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a prestressed anchor cable for foundation pit support proposed by the present invention;

[0023] Figure 2 It is a schematic diagram of the cross-sectional structure of the inner anchor head in the present invention;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of a square plate in the present invention;

[0025] Figure 4 is a schematic cross-sectional structural diagram of the first extension rod in the present invention;

[0026] Figure 5 It is a schematic diagram of the insertion structure of the anchor cable body and the inner anchor head in the present invention;

[0027] Figure 6 for Figure 3 A schematic diagram of the structure enlargement in the middle;

[0028] Figure 7 for Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0029] Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point C in the middle.

[0030] In the figure: 1, inner anchor head; 2, anchor cable body; 3, outer anchor head; 4, square plate; 5, first telescopic rod; 6, first spring; 7, first fixed plate; 8, first extension rod; 9, second spring; 10, second telescopic rod; 11, extrusion block; 12, connecting plate; 13, pull rope; 14, threaded cap; 15, threaded ring; 16, first opening groove; 17, third opening groove; 18, second extension rod; 19, pressure block; 20, third spring; 21, mounting plate; 22, second opening groove; 23, movable plate; 24, protective plate; 25, second fixed plate; 26, third telescopic rod; 27, fourth spring; 28, sliding groove; 29, fifth spring; 30, sliding plate; 31, connecting bolt. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] like Figure 1-Figure 8 As shown, a prestressed anchor cable for foundation pit support proposed by the present invention comprises an inner anchor head 1, a plurality of anchor cable bodies 2 are installed on the upper part of the inner anchor head 1, an outer anchor head 3 is movably connected to one end of the plurality of anchor cable bodies 2 away from the inner anchor head 1, a square plate 4 is installed on the outer side of the outer anchor head 3, mounting plates 21 are installed on both sides of the square plate 4, the mounting plates 21 are threadedly connected to the connecting bolts 31, a wrapping assembly for the mounting plate 21 is arranged on the square plate 4, the wrapping assembly comprises a movable plate 23 symmetrically slidably arranged on the anchor cable body 2, and a protective plate 24 movably connected to the movable plate 23, and the protective plate 24 can wrap the connecting bolts 31;

[0034] A stabilizing assembly for the inner anchor head 1 is provided on the inner side of the inner anchor head 1, and the stabilizing assembly includes a first extension rod 8 symmetrically and movably connected to the inner side of the inner anchor head 1, an extrusion block 11 movably connected to the inner side of the inner anchor head 1, and a second extension rod 18 movable inside the first extension rod 8, the first extension rod 8 and the second extension rod 18 move in opposite directions through the up and down movement of the extrusion block 11, a connecting plate 12 is installed on the upper part of the extrusion block 11, a pull rope 13 is installed on the side of the connecting plate 12 away from the extrusion block 11, and the pull rope 13 is movably connected to the outer anchor head 3, a first telescopic rod 5 and a first spring 6 are symmetrically installed on the inner side of the inner anchor head 1, a first fixing plate 7 is installed on one end of the first telescopic rod 5 and the first spring 6 close to the extrusion block 11, and the first fixing plate 7 is fixedly connected to the first extension rod 8, a first opening groove 16 is symmetrically opened on the inner side of the inner anchor head 1, the first opening groove 16 is slidably connected to the first extension rod 8, and the size of the opening of the first opening groove 16 is adapted to the size of the first extension rod 8;

[0035] A second spring 9 and a second telescopic rod 10 are installed on the inner side of the inner anchor head 1, and the second spring 9 and the second telescopic rod 10 are fixedly connected to the extrusion block 11 at one end close to the first extension rod 8. A third opening groove 17 is provided on the inner side of the first extension rod 8, and the second extension rod 18 is slidably arranged on the inner side of the third opening groove 17. A pressure block 19 is installed at one end of the second extension rod 18 close to the extrusion block 11, and a third spring 20 is installed between the second extension rod 18 and the inner side of the third opening groove 17. The cross-sections of the extrusion block 11, the first extension rod 8 and the pressure block 19 are all trapezoidal, and the two first extension rods 8 and the pressure block 19 are all above the cross-section of the extrusion block 11. The size of the opening of the third opening groove 17 is adapted to the size of the second extension rod 18, and the cross-sections of the third opening groove 17 and the second extension rod 18 are both L-shaped. A threaded ring 15 is installed on the upper part of the outer anchor head 3, and the threaded ring 15 is threadedly connected to the threaded cap 14, and the threaded cap 14 is rotatably connected to the pull rope 13.

[0036] In this embodiment, when working, when the inner anchor head 1 and the anchor cable body 2 are inserted into the preset hole, the threaded ring 15 can be rotated at this time. Since the threaded ring 15 is threadedly connected to the threaded cap 14, the threaded ring 15 itself can be moved in a direction away from the outer anchor head 3 by the force generated by the rotation of the threaded ring 15, and the pull rope 13 can be moved at the same time. When the pull rope 13 moves, it pulls the extrusion block 11 through the connecting plate 12, so that the extrusion block 11 moves in a direction close to the first extension rod 8. At this time, the second spring 9 and the second telescopic rod 10 are stretched until the extrusion block 11 is moved to the first extension rod 8. The pressing block 11 squeezes the inclined surface of the first extension rod 8. When the first extension rod 8 is squeezed by the squeezing block 11, it passes through the first opening slot 16 and moves away from the inner anchor head 1. At this time, the first telescopic rod 5 and the first spring 6 contract until the first extension rod 8 is inserted into the soil, so that the inner anchor head 1 can be firmly fixed in the hole, thereby providing a stable support effect, dispersing the tension or pressure on the inner anchor head 1, and thus improving the anchoring force of the entire device, which is particularly important for application scenarios that need to withstand large loads or require high stability.

[0037] The pull rope 13 is continuously pulled by rotating the threaded ring 15 until the extrusion block 11 squeezes the inclined surface of the pressure block 19, thereby driving the second extension rod 18 to separate from the third opening groove 17. At this time, the third spring 20 contracts, and then the second extension rod 18 continues to be inserted into the soil. The contact area between the first extension rod 8 and the soil is increased through the second extension rod 18, thereby improving the bearing capacity of the first extension rod 8 and being able to withstand a larger load.

[0038] Embodiment 2

[0039] like Figure 1-Figure 8 As shown, based on the first embodiment, second opening grooves 22 are provided on both sides of the anchor body 2, and the movable plate 23 is slidably arranged on the inner side of the second opening groove 22. A third telescopic rod 26 and a fourth spring 27 are installed on the upper part of the movable plate 23. A second fixed plate 25 is installed on the side of the protective plate 24 close to the movable plate 23, and the third telescopic rod 26 and the fourth spring 27 are fixedly connected with the second fixed plate 25. A sliding groove 28 is symmetrically provided on the upper part of the square plate 4, and a sliding plate 30 is slidably arranged on the inner side of the sliding groove 28. The sliding plate 30 is fixedly connected to the movable plate 23, and a fifth spring 29 is installed on the side of the sliding plate 30. The side of the fifth spring 29 away from the sliding plate 30 is fixedly connected to the inner wall of the sliding groove 28, and the cross-section of the contact part of the protective plate 24 and the connecting bolt 31 when squeezed is trapezoidal.

[0040] In this embodiment, after the inner anchor head 1 and the anchor cable body 2 are inserted into the hole and the grouting work is completed, the mounting plates 21 on both sides of the square plate 4 can be fixed to the wall surface through the connecting bolts 31. Before fixing the connecting bolts 31, the protective plate 24 can be pushed into the second opening groove 22, and the sliding plate 30 can be driven to slide along the sliding groove 28. At this time, the fifth spring 29 contracts. After the connecting bolts 31 are fixed, the sliding plate 30 can be loosened and the sliding plate 30 can be pulled along the sliding groove 28, and the protective plate 24 can be driven to move in the direction close to the connecting bolts 31 until the inclined surface of the protective plate 24 squeezes the connecting bolts 31. At the same time, the squeezing force can drive the protective plate 24 to move in the direction away from the mounting plate 21. At the same time, the third telescopic rod 26 and the fourth spring 27 are stretched until The protective plate 24 moves to the upper part of the connecting bolt 31, and then the protective plate 24 is pushed by the sliding plate 30 until the protective plate 24 moves to the other side of the connecting bolt 31. At this time, the protective plate 24 no longer squeezes the connecting bolt 31, and the third telescopic rod 26 and the fourth spring 27 in the retracted state are reset, thereby driving the protective plate 24 to press against the mounting plate 21, and the stability of the protective plate 24 is ensured by the reset force of the fifth spring 29, so that the connecting bolt 31 is wrapped by the protective plate 24 to protect it from erosion by the external environment, such as rain, moisture, dust and chemical substances, so that the device itself is suitable for harsh environments, and the protective plate 24 provides an additional fixing layer for the connecting bolt 31, which helps to prevent 31 from loosening due to external force, which helps to maintain the stability of the device.

[0041] 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 prestressed anchor cable for foundation pit support, comprising an inner anchor head (1), characterized in that: A plurality of anchor cable bodies (2) are installed on the upper part of the inner anchor head (1), and one end of the plurality of anchor cable bodies (2) away from the inner anchor head (1) is movably connected to an outer anchor head (3), and a square plate (4) is installed on the outer side of the outer anchor head (3), and mounting plates (21) are installed on both sides of the square plate (4), and the mounting plates (21) are threadedly connected to the connecting bolts (31), and a wrapping component for the mounting plate (21) is arranged on the square plate (4), and the wrapping component comprises a movable plate (23) symmetrically slidably arranged on the anchor cable body (2), and a protective plate (24) movably connected to the movable plate (23), and the protective plate (24) can wrap the connecting bolts (31); A stabilizing assembly for the inner anchor head (1) is arranged on the inner side of the inner anchor head (1), and the stabilizing assembly comprises a first extension rod (8) symmetrically and movably connected to the inner side of the inner anchor head (1), an extrusion block (11) movably connected to the inner side of the inner anchor head (1), and a second extension rod (18) movable inside the first extension rod (8), the first extension rod (8) and the second extension rod (18) moving in opposite directions through the up and down movement of the extrusion block (11), a connecting plate (12) is installed on the upper part of the extrusion block (11), a pull rope (13) is installed on the side of the connecting plate (12) away from the extrusion block (11), and the pull rope (13) is movably connected to the outer anchor head (3).

2. The prestressed anchor cable for foundation pit support according to claim 1, characterized in that: A first telescopic rod (5) and a first spring (6) are symmetrically installed on the inner side of the inner anchor head (1); a first fixing plate (7) is installed on one end of the first telescopic rod (5) and the first spring (6) close to the extrusion block (11); the first fixing plate (7) is fixedly connected to the first extension rod (8); a first opening groove (16) is symmetrically opened on the inner side of the inner anchor head (1); the first opening groove (16) is slidably connected to the first extension rod (8); the size of the opening of the first opening groove (16) is adapted to the size of the first extension rod (8).

3. The prestressed anchor cable for foundation pit support according to claim 1, characterized in that: A second spring (9) and a second telescopic rod (10) are installed on the inner side of the inner anchor head (1); the second spring (9) and the second telescopic rod (10) are fixedly connected to the extrusion block (11) at one end close to the first extension rod (8).

4. The prestressed anchor cable for foundation pit support according to claim 3, characterized in that: A third opening groove (17) is provided on the inner side of the first extension rod (8), the second extension rod (18) is slidably arranged on the inner side of the third opening groove (17), a pressure block (19) is installed on one end of the second extension rod (18) close to the extrusion block (11), and a third spring (20) is installed between the second extension rod (18) and the inner side of the third opening groove (17).

5. The prestressed anchor cable for foundation pit support according to claim 4, characterized in that: The cross-sections of the extrusion block (11), the first extension rod (8) and the pressure block (19) are all trapezoidal, and the two first extension rods (8) and the pressure block (19) are both located above the cross-section of the extrusion block (11).

6. The prestressed anchor cable for foundation pit support according to claim 4, characterized in that: The size of the opening of the third opening slot (17) is matched to the size of the second extension rod (18), and the cross-sections of the third opening slot (17) and the second extension rod (18) are both L-shaped.

7. The prestressed anchor cable for foundation pit support according to claim 1, characterized in that: The anchor cable body (2) is provided with a second opening groove (22) on both sides, the movable plate (23) is slidably arranged inside the second opening groove (22), a third telescopic rod (26) and a fourth spring (27) are installed on the upper part of the movable plate (23), a second fixed plate (25) is installed on the side of the protective plate (24) close to the movable plate (23), and the third telescopic rod (26) and the fourth spring (27) are fixedly connected to the second fixed plate (25).

8. The prestressed anchor cable for foundation pit support according to claim 7, characterized in that: The upper part of the square plate (4) is symmetrically provided with a sliding groove (28), the inner side of the sliding groove (28) is slidably provided with a sliding plate (30), the sliding plate (30) is fixedly connected to the movable plate (23), and a fifth spring (29) is installed on the side of the sliding plate (30), and the side of the fifth spring (29) away from the sliding plate (30) is fixedly connected to the inner wall of the sliding groove (28).

9. The prestressed anchor cable for foundation pit support according to claim 1, characterized in that: A threaded ring (15) is installed on the upper part of the outer anchor head (3); the threaded ring (15) is threadedly connected to a threaded cap (14); and the threaded cap (14) is rotationally connected to a pull rope (13).

10. The prestressed anchor cable for foundation pit support according to claim 7, characterized in that: The cross section of the contact portion between the protection plate (24) and the connection bolt (31) when pressed is trapezoidal.

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