Extension device of grouting-free low-retraction anchoring system

Abstract

The utility model relates to an anchorage device, in particular to an extension device of a grouting-free low-retraction anchoring system, which comprises a transition sleeve, an extension sleeve, an anchor backing plate and an extension steel pipe. The transition sleeve is connected to one end of the extension steel pipe; a first inner hole of the transition sleeve is connected with the outer wall of an anchor head of the anchor cable; a second inner hole is drilled in one end of the lengthened sleeve; an anchor head is inserted into the anchor rod, and the anchor rod is screwed and connected with an anchor cable steel strand; a third inner hole is drilled in the middle of the anchor bearing plate; the other end of the lengthened sleeve is inserted into the third inner hole and connected with the anchor bearing plate; the anchor bearing plate is further provided with a fourth inner hole and a fifth inner hole. According to the structure, the anchor head and the lengthening sleeve are connected more stably, and other safety problems are avoided while the anchor head is lengthened; the problem that the grouting-free low-retraction anchor cable is not long enough is solved.

Description

Technical Field

[0001] The utility model relates to an anchor, in particular to an extension device of a grouting-free low-retraction anchoring system. Background Art

[0002] At present, the main method used in short-beam prestressing at home and abroad is the grouting-free low-shrinkage anchoring system, which is mainly composed of anchors, cable bodies and heat shrink sleeves. The anchors include tensioning end anchors and fixed end anchors, and the cable bodies include protective sleeves, anti-corrosion grease and steel strands. The system achieves structural stability through the tensioning of prestressed tendons and the fixation of anchors. There is no need to use grouting materials for grouting, which significantly shortens the construction period and reduces material and labor costs. This technology avoids the use of grouting materials in traditional anchor systems, reduces construction steps and material consumption, and avoids quality problems caused by loose grouting. Through a unique fixing method, the system effectively reduces the shrinkage of the anchor cables, ensures the effective transmission of prestress, and improves the stability and bearing capacity of the structure.

[0003] In a grout-free, low-retraction anchorage system, a tensioning anchor is installed at one end of the cable, while a fixed anchor or tensioning anchor can be installed at the other end. The tensioning anchorage consists of components such as an anchor head, a load-bearing nut, and an anchor pad. It anchors the structure by tensioning the prestressed tendons and tightening the anchorage. The fixed anchorage secures the prestressed tendons in the structure through a specific fixing method to prevent them from shrinking and loosening. However, a problem with the anchors in existing grout-free, low-retraction anchorage systems is that the anchorage length is fixed after the prestressed tendons are cut, making it impossible to adjust them temporarily based on actual site conditions. Utility Model Content

[0004] The utility model overcomes the deficiencies of the prior art, proposes an extension device for a grouting-free low-retraction anchoring system, and solves the problem of insufficient length of the grouting-free low-retraction anchor cable.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions.

[0006] The anchor plate has a first end for locking the second retaining member and a second end for locking the second retaining member from the support frame of the second support frame, and a third end for locking the second retaining member from the support frame.

[0007] Furthermore, the extended steel pipe is a cylindrical tubular structure with open ends.

[0008] Furthermore, the transition sleeve is provided with an external thread, and the outer wall of the transition sleeve is connected to the first connecting end of the extended steel pipe through the external thread.

[0009] Furthermore, the anchor plate is a circular or polygonal steel plate.

[0010] Furthermore, the fourth inner hole and the fifth inner hole are spaced 80 to 90 mm apart on the front side of the anchor plate, and are spaced 35 to 45 mm apart on the back side of the anchor plate.

[0011] Furthermore, one end of the second mounting end of the extension sleeve is provided with an external thread for tightening the pressure nut.

[0012] The beneficial effects of the present invention compared to the prior art are as follows:

[0013] The utility model is connected to the anchor head by a transition sleeve, and is connected to the extended steel pipe by the transition sleeve, the extended steel pipe is connected to the anchor plate, and the anchor plate is connected to the extended sleeve, so that the connection between the anchor head and the extended sleeve is more stable, and while extending the anchor head, no other safety problems will occur; the anchor plate plays a role of stabilizing the connection on the one hand, and on the other hand, a groutable structure is superimposed on the grouting-free structure, thereby improving the scope of application and being applicable to various working conditions, and can be used in the fields of concrete bridges, building structures, slope rock and soil anchoring and hanging basket anchoring.

[0014] The prestressed tendons of the utility model adopt high-strength extended sleeves, which save more materials than precision-rolled threaded steel anchors and prestressed steel bars; and the utility model has a simple structure, is easy to install, speeds up construction efficiency and shortens construction period.

[0015] The utility model solves the problem that the length of the grouting-free low-retraction anchoring system is fixed after cutting and cannot be temporarily adjusted according to the actual situation on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of a grouting-free low-retraction anchor system extension device of the utility model;

[0017] Figure 2 yes Figure 1 Cross-sectional view of the middle anchor pad;

[0018] Figure 3 yes Figure 1 Cross-sectional view of the middle extension sleeve;

[0019] Figure 4 yes Figure 1 Cross-sectional view of the middle extension steel pipe;

[0020] Figure 5 yes Figure 1 Schematic diagram of the structure of the middle transition sleeve.

[0021] Figure 6 yes Figure 5 side view.

[0022] In the picture:

[0023] 1-transition sleeve; 2-extension sleeve; 3-extended steel pipe; 4-anchor plate; 11-first inner hole; 12-threaded structure; 21-connecting end; 22-second mounting end; 211-second inner hole; 31-first mounting end; 32-first connecting end; 41-fourth inner hole; 42-third inner hole; 43-fifth inner hole. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0025] like Figures 1 to 6As shown, this embodiment provides an extension device for a grout-free, low-retraction anchor system, comprising a transition sleeve 1, an extension sleeve 2, an anchor plate 4, and an extension steel pipe 3. The extension steel pipe 3 is a cylindrical tubular structure with open ends, made of Q235B carbon structural steel. One end of the extension steel pipe 3 is a first mounting end 31, and the other end is a first connection end 32. The transition sleeve 1 is a circular ring structure with an M72*2 external thread, a nominal diameter of 72mm, and a pitch of 2mm. A first inner hole 11 is drilled in the center of the transition sleeve 1. The outer wall of the transition sleeve 1 is connected to the first connection end 32 of the extension steel pipe 3 via external threads.

[0026] Furthermore, an M48*2 thread structure 12 is provided on the inner wall of the first inner hole 11 of the transition sleeve 1, with a tooth angle of 60 degrees, a major diameter of 48mm, a pitch of 2mm, and a minor diameter of 45.9mm. The thread structure 12 is used to tighten the anchor head 5 of the anchor cable and connect other structures.

[0027] One end of the extension sleeve 2 is a second mounting end 22, and the other end is a second connecting end 21. The second connecting end 21 of the extension sleeve 2 is drilled with a second inner hole 211. This second inner hole 211 is a blind hole for inserting the anchor head 5. It is provided with an M39*3 external thread for tightening the anchor cable strand 6, thus extending and connecting the strands. One end of the second mounting end 22 of the extension sleeve 2 is provided with an external thread for tightening the pressure nut.

[0028] The anchor plate 4 is a circular or polygonal steel plate of a certain thickness. In this embodiment, the anchor plate 4 is square;

[0029] A third inner hole 42 is drilled in the middle of the anchor plate 4. The third inner hole 42 is a through hole. The inner diameter of the third inner hole 42 is slightly larger than the outer diameter of the second mounting end 22 of the extension sleeve 2, so that the second mounting end 22 can be inserted into and connected to the extension sleeve 2.

[0030] The anchor plate 4 also has a fourth inner hole 41 and a fifth inner hole 43. Both are through holes and are symmetrically located on either side of the third inner hole 42. The fourth and fifth inner holes 41, 43 are 85 mm apart and 14 mm in diameter on the front of the anchor plate 4, and 40 mm apart and 14 mm in diameter on the back. One end of each is located within the first mounting end 31, while the other end is located outside the first mounting end 31. These fourth and fifth inner holes 41, 43 facilitate grouting and discharging during subsequent construction.

[0031] The extension device of the grouting-free low-retraction anchoring system described in this embodiment is connected to the anchor head 5 through a transition sleeve 1, and is connected to the extension steel pipe 3 through the transition sleeve 1, the extension steel pipe 3 is connected to the anchor plate 4, and the anchor plate 4 is connected to the extension sleeve 2, so that the connection between the anchor head 5 and the extension sleeve 2 is more stable, and while extending the anchor head, no other safety problems will arise; the anchor plate 4 plays a role of stabilizing the connection on the one hand, and on the other hand, a groutable structure is superimposed on the grouting-free structure, thereby improving the scope of application and being applicable to various working conditions. It can be used in the fields of concrete bridges, building structures, slope rock and soil anchoring, and hanging basket anchoring.

[0032] A grouting-free low-retraction anchor system extension device uses a high-strength extension sleeve for the prestressed tendons, which saves more materials than precision-rolled threaded steel anchors and prestressed steel bars. In addition, the device has a stable and simple structure and is easy to install, which speeds up construction efficiency and shortens the construction period.

[0033] This solves the problem of insufficient length of grout-free, unbonded prestressed anchor cables after cutting, effectively utilizing any remaining cables that are insufficient on-site and avoiding wasted cables. Before the improvement, replacing each anchor cable took 10 minutes; after the improvement, installing each unbonded prestressed anchor cable extension device only takes 5 minutes.

[0034] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. An extension device for a grout-free low-retraction anchoring system, characterized in that: The invention comprises a transition sleeve (1), an extension sleeve (2), an anchor plate (4) and an extension steel pipe (3); one end of the extension steel pipe (3) is a first mounting end (31), and the other end is a first connecting end (32); a first inner hole (11) is drilled in the middle of the transition sleeve (1), and the outer wall of the transition sleeve (1) is connected to the first connecting end (32) of the extension steel pipe (3); the first inner hole (11) is connected to the outer wall of the anchor head (5) of the anchor cable; one end of the extension sleeve (2) is a second mounting end (22), and the other end is a second connecting end (21); the second connecting end (21) of the extension sleeve (2) is drilled with a second inner hole (211); the second inner hole (211) is a blind hole for inserting the anchor head (5) and is screwed and connected to the anchor cable steel strand (6); a third inner hole (42) is drilled in the middle of the anchor plate (4), the third inner hole (42) is a through hole, the second mounting end (22) of the extension sleeve (2) is inserted into the third inner hole (42) and connected to the anchor plate (4); the anchor plate (4) is also provided with a fourth inner hole (41) and a fifth inner hole (43); the fourth inner hole (41) and the fifth inner hole (43) are both through holes; the fourth inner hole (41) and the fifth inner hole (43) are symmetrically arranged on both sides of the third inner hole (42); one end of the fourth inner hole (41) and the fifth inner hole (43) are located inside the first mounting end (31), and the other end of the fourth inner hole (41) and the fifth inner hole (43) are located outside the first mounting end (31).

2. The extension device of the grouting-free low-retraction anchoring system according to claim 1 is characterized in that: The extended steel pipe (3) is a cylindrical tubular structure with open ends.

3. The extension device of the grouting-free low-retraction anchoring system according to claim 1 is characterized in that: The transition sleeve (1) is provided with an external thread, and the outer wall of the transition sleeve (1) is connected to the first connection end (32) of the extension steel pipe (3) through the external thread.

4. The extension device of the grouting-free low-retraction anchoring system according to claim 1, characterized in that: The anchor plate (4) is a circular or polygonal steel plate.

5. The extension device of the grouting-free low-retraction anchoring system according to claim 4 is characterized in that: The fourth inner hole (41) and the fifth inner hole (43) are spaced 80 to 90 mm apart on the front side of the anchor plate (4), and are spaced 35 to 45 mm apart on the back side of the anchor plate (4).

6. The extension device of the grouting-free low-retraction anchoring system according to claim 1, characterized in that: One end of the second mounting end (22) of the extension sleeve (2) is provided with an external thread for tightening the pressure nut.

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