Anti-pulling anchor rod construction structure

Abstract

The utility model discloses an anti-pulling anchor rod construction structure, relates to the technical field of anchor rod construction, and solves the problem that an anchor rod in the prior art has the risk of being pulled off from anchoring section concrete. The device comprises a first connecting rod and a second connecting rod, the end portion of the first connecting rod is connected with an end head, the end portion of the second connecting rod is connected with an anchoring disc, the anchoring disc is arranged on the end head in a sliding mode, a plurality of expanding arms are hinged to the end head in the circumferential direction, and a guiding limiting structure matched with the expanding arms is arranged on the anchoring disc. The other end of the first connecting rod and the other end of the second connecting rod are both connected with the working anchor. Through the arrangement of the end and the expansion arm hinged to the end, the anchor rod can be changed in shape before and after the whole anchor rod is put into a drill hole, is in a folded state before the whole anchor rod is put into the drill hole, is expanded outwards under the cooperation of the guide limiting structure on the anchoring disc after the whole anchor rod is put into the drill hole, is more stable and fully combined with anchoring section concrete to be constructed on site, and improves the overall pulling resistance.

Description

Technical Field

[0001] This utility model relates to the field of anchor bolt construction technology, and in particular to an anti-pull-out anchor bolt construction structure. Background Technology

[0002] During the construction phase of deep foundation pit retaining structures, the function of anchor bolts is to transfer tensile forces to the anchoring system of stable rock strata or soil. One end of the anchor bolt uses a reinforced concrete girder and anchorage, while the other end is anchored in the rock and soil and prestressed to withstand the structural tensile forces generated by rock and soil pressure, water pressure, buoyancy resistance, and overturning resistance, thereby maintaining the stability of the deep foundation pit retaining structure.

[0003] In existing anchor bolt construction techniques, anchor holes are first drilled using an anchor drilling machine, then the anchor bolt is placed directly into the anchor hole, and finally grouting is performed to form the anchoring section for fixation. The process requires drilling before inserting the anchor bolt, with the hole diameter slightly larger than the outermost diameter of the anchor bolt to facilitate insertion. Only the innermost anchoring section is enlarged. However, the inner diameter of the anchor bolt is limited, resulting in limited axial resistance. Therefore, after casting, the anchor bolt is prone to being pulled out of the concrete of the anchoring section during tensioning.

[0004] For example, Chinese invention patent CN115679953A discloses a construction method and structure for an anchor bolt. The construction method includes: drilling a guide hole using a first drill bit; drilling multiple enlarged holes using a second drill bit, with the enlarged holes spaced apart axially along the guide hole, the diameter of the enlarged holes being larger than the diameter of the guide hole; the guide hole and the multiple enlarged holes communicating to form an anchoring hole; inserting an anchor bar into the guide hole; and grouting into the anchoring hole, with grouting forming an anchoring section in the guide hole and grouting forming an enlarged diameter section in the enlarged hole; the anchoring section and the enlarged diameter section connecting to form the anchor bolt structure. In this construction method, the drill bit is easier to operate in soft rock formations, and the multiple enlarged diameter sections create end-bearing resistance during pull-out stress, thus giving the anchor bolt structure greater ultimate pull-out resistance and better long-term stability.

[0005] This scheme uses multiple enlarged holes along the axial direction and grouting to form an anchorage section, thereby improving pull-out resistance. The improvement is in the pull-out force between the anchorage section as a whole and the soil at the construction site. However, this scheme does not improve the pull-out resistance between the anchor bars and the concrete of the grouting profile, thus failing to increase friction by increasing the axial contact area and simultaneously improving pull-out resistance. Therefore, the risk of the anchor bars being easily pulled out still exists. Utility Model Content

[0006] To address the shortcomings in the aforementioned background technology, this utility model proposes an anti-pull-out anchor construction structure, which solves the problem of the risk of anchors being pulled out of the concrete of the anchoring section in the prior art.

[0007] The technical solution of this utility model is implemented as follows: a pull-out anchor construction structure includes a first connecting rod and a second connecting rod. The end of the first connecting rod is connected to an end head, and the end of the second connecting rod is connected to an anchoring plate. The anchoring plate is slidably disposed on the end head, and the end head is circumferentially hinged with several expansion arms. The anchoring plate is provided with a guide and limiting structure that cooperates with the expansion arms. The other ends of the first connecting rod and the second connecting rod are both connected to a working anchor.

[0008] Preferably, the end is a T-shaped end with a through hole in the middle to allow the first connecting rod to pass through.

[0009] Preferably, the front end of the perforation is provided with a tapered hole, and the end of the first connecting rod is provided with a tightening sleeve that mates with the tapered hole.

[0010] Preferably, the anchoring disc has a stepped hole at its axis that mates with the end, and the anchoring disc has several tapered holes around its circumference. The end of the second connecting rod has a tightening sleeve that mates with the tapered holes.

[0011] Preferably, the guiding and limiting structure includes circumferentially spaced receiving grooves on the anchoring plate, and the receiving grooves are provided with limiting guide posts and limiting blocks that cooperate with the expanding arm.

[0012] Preferably, the end has a plurality of opening slots circumferentially formed, and one end of the extended arm is hinged to each of the opening slots.

[0013] Preferably, the extended arm is a rectangular strip, with a hinge shaft passing through the opening slot, and a through hole at one end of the extended arm, which is used to engage with the hinge shaft to achieve hinge connection.

[0014] Preferably, the end is provided with an anti-detachment ring; the end and the stepped hole are provided with a positioning groove and a positioning protrusion.

[0015] Preferably, the working anchor includes a disc body with several tapered holes for the ends of the second connecting rod to pass through. The ends of the second connecting rod are provided with tightening sleeves that mate with the tapered holes. A through hole is provided in the center of the disc body, and external threads are provided on the outer end of the first connecting rod. A locking nut for mates with the external threads is rotatably provided at the through hole. The tightening sleeve is a tapered sleeve with a contraction groove.

[0016] The beneficial effects of this utility model are as follows: By setting an end cap and an expanding arm hinged to the end cap, the shape of the anchor rod can be changed before and after it is inserted into the borehole. Before insertion, it is in a closed state; after insertion, it expands outward with the help of the guiding and limiting structure on the anchoring plate, resulting in a more stable and thorough bond with the concrete of the anchoring section to be constructed on site, improving the overall pull-out resistance and further avoiding the risk of pull-out. The first and second connecting rods enable the overall function of the anchor rod, cooperating with the working anchor at the outer end to complete pre-tightening and anchoring construction. This utility model has a reliable structure and strong pull-out resistance. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the expanded arm of this utility model in its expanded state;

[0019] Figure 2 This is a schematic diagram of the retracted state of the extended arm of this utility model;

[0020] Figure 3 This is a schematic cross-sectional view of the expanded arm retracted state of this utility model;

[0021] Figure 4 This is a schematic cross-sectional view of the expanded arm of this utility model.

[0022] Figure 5 This is a schematic diagram of the end structure of this utility model;

[0023] Figure 6 This is a schematic diagram of the working anchoring structure of this utility model;

[0024] Figure 7 This is a schematic diagram of the working anchorage cross-sectional structure of this utility model;

[0025] In the diagram: 1: First connecting rod, 2: Second connecting rod, 3: End, 4: Anchor plate, 5: Extended arm, 6: Working anchor, 7: Tool anchor, 8: Through hole, 9: Tightening sleeve, 10: Stepped hole, 11: Receiving groove, 12: Limiting guide post, 13: Limiting block, 14: Opening groove, 15: Anti-detachment ring, 16: Positioning groove, 17: Positioning protrusion, 18: Locking nut, 19: Contraction joint. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figure 1 , 2 As shown in Figures 3 and 4, in Embodiment 1, a pull-out anchor construction structure includes a first connecting rod 1 and a second connecting rod 2. The end of the first connecting rod 1 is connected to an end cap 3, and the end of the second connecting rod 2 is connected to an anchoring plate 4. The anchoring plate 4 is slidably mounted on the end cap 3. Several expanding arms 5 are circumferentially hinged to the end cap 3. The anchoring plate 4 is provided with a guiding and limiting structure that cooperates with the expanding arms 5. The other ends of both the first connecting rod 1 and the second connecting rod 2 are connected to a working anchor 6. In this embodiment, the expanding arms can change shape before and after the anchor is inserted into the borehole. Before insertion, they are in a retracted state; after insertion, they expand outward with the cooperation of the guiding and limiting structure on the anchoring plate, resulting in a more stable and complete bond with the concrete of the anchoring section to be constructed on site, improving the overall pull-out resistance and further avoiding the risk of pull-out.

[0028] In this embodiment, the anchor hole is first formed and the anchoring section is enlarged using a drilling rig. Then, the anchor rod's extension arm is adjusted to a retracted state, and a conventional grouting pipe is tied to the second connecting rod. The entire anchor rod is then placed into the anchor hole. After the extension arm is inserted into the anchoring section, the position of the first connecting rod relative to the second connecting rod is adjusted to expand the extension arm, increasing the extent of expansion in the enlarged section. Grouting is then performed using the grouting pipe, employing conventional construction methods. After grouting, the extension arm, end, and anchoring plate are solidified in the concrete of the anchoring section, forming a strong tensile foundation. Finally, conventional on-site construction of the joist beam is carried out, and the working anchor is fitted with the joist beam. The first and second connecting rods are then tightened, creating a preload between the working anchor and the anchoring section.

[0029] In actual construction, sleeves are fitted onto the outer sides of the middle sections of both the first and second connecting rods, with both ends of the sleeves sealed to facilitate the extension of the first and second connecting rods during the subsequent application of pre-tension. Furthermore, conventional steel cables can be used for both the first and second connecting rods, resulting in better anchoring after the application of pre-tension. This invention features a reliable structure, strong pull-out resistance, and can adapt to the anchoring construction needs of different geological strata.

[0030] Example 2: A construction structure for an anti-pull-out anchor bolt, based on Example 1, such as... Figure 5As shown, the end 3 has a T-shaped cross-section and is a rotating body. The middle of the end 3 has a through hole 8 for the first connecting rod 1 to pass through. Additionally, the front end of the through hole 8 has a tapered hole, and the end of the first connecting rod 1 has a tightening sleeve 9 that mates with the tapered hole. The tapered hole compresses the tightening sleeve during tensioning, thereby tightening the sleeve onto the first connecting rod and fixing it in place.

[0031] In addition, the anchoring disc 4 has a stepped hole 10 at its axis that mates with the end 3. The stepped hole is used to allow the T-shaped end to slide and engage properly. In the expanded arm and expanded hole state, the T-shaped end is fully inserted into the stepped hole, forming a stable fit. Furthermore, the anchoring disc 4 has several tapered holes circumferentially, and the end of the second connecting rod 2 has a tightening sleeve 9, which engages with the tapered holes. In this embodiment, four second connecting rods are designed, each with a corresponding tapered hole and tightening sleeve. The four tapered holes are evenly spaced along the circumference of the anchoring disc, thus forming a stable pull-out structure.

[0032] As a further specific implementation, the guiding and limiting structure includes accommodating grooves 11 that are circumferentially spaced on the anchoring plate 4. The accommodating grooves can provide space for the retraction and outward movement of the outer end of the expanding arm. The accommodating grooves are provided with limiting guide posts 12 and limiting blocks 13 that cooperate with the expanding arm 5. The limiting guide posts 12 are located on the inner side of the expanding arm and can support the inner side of the expanding arm during the outward expansion process. After the expanding arm is in place, they can cooperate with the limiting blocks located on the outer side to support and fix the expanding arm.

[0033] In this embodiment, the end 3 is provided with several circumferentially open slots 14, and one end of the expanding arm 5 is hinged to each of the open slots 14. Specifically, in this embodiment, the expanding arm 5 is a rectangular strip, a hinge shaft passes through the open slot 14, and one end of the expanding arm 5 is provided with a through hole, which cooperates with the hinge shaft to achieve hinge. In this embodiment, a total of four open slots are provided, corresponding to four expanding arms, which can be evenly inserted into the outer space when expanding outwards. With the cooperation of the limiting guide post and the limiting block, a stable structure is formed, improving the overall tensile strength.

[0034] As a further specific implementation, to prevent detachment between the end cap and the anchor plate, and between the extended arm and the guide limiting structure during installation, an anti-detachment ring 15 is provided on the end cap 3 to limit the range of movement of the anchor plate relative to the end cap. In addition, to achieve positioning after the extended arm is fully expanded, a positioning groove 16 and a positioning protrusion 17 are provided between the end cap 3 and the stepped hole 10. Thus, after expansion to the full extent, the positioning protrusion and the positioning groove cooperate to lock the position.

[0035] Example 3: A construction structure for an anti-pull-out anchor bolt, based on Example 2, such as... Figure 6 , 7As shown, the working anchor 6 includes a disc body with several tapered holes for the ends of the second connecting rods 2 to pass through. The ends of the second connecting rods 2 are provided with tightening sleeves 9 that mate with the tapered holes. In this embodiment, the disc body has four tapered holes to accommodate four second connecting rods. Additionally, the disc body has a through hole in the center to accommodate the first connecting rod. The outer end of the first connecting rod 1 has an external thread, and a locking nut 18 for mates with the external thread is rotatably provided at the through hole.

[0036] After the entire assembly is placed into the borehole, keep the second connecting rod and the disc body stationary, rotate the locking nut on the working anchor 6 to pull the first connecting rod and cause its end 3 to move outward. As the end 3 moves outward, the expanding arm on it moves outward accordingly. Under the guidance of the limiting guide post 12, the movable end of the expanding arm gradually opens outward until it moves to fit against the limiting block 13, thus completing the expansion.

[0037] As a further specific implementation, in this embodiment, the tightening sleeve 9 is a conical sleeve with a through hole at its axis for engaging with the outer wall of the first or second connecting rod. Additionally, a contraction slot 19 is provided on the conical sleeve. When subjected to tensile force, the conical sleeve contracts under the contracting action of the conical hole, simultaneously reducing the width of the contraction slot, thereby pressing against the first or second connecting rod at the inner hole.

[0038] As a further optional construction scheme, after the expansion is completed, the working anchor is adjusted to fit against the waist beam of the construction site to form an anchorage, and then the anchor bolt tensioning is carried out. During construction, the jack is installed on the outside of the working anchor, with one end of the jack in contact with the working anchor 6. A tool anchor 7 is installed on the second connecting rod at the other end of the jack. The tool anchor 7 has the same structure as the working anchor and the same connection method with the first and second connecting rods. Then, a lock nut is installed on the first connecting rod corresponding to the tool anchor, and it is turned to fit on the tool anchor for subsequent tensioning. Then, the jack is connected to the hydraulic pump, and the jack is used to apply tension to the tool anchor. At this time, the first and second connecting rods are tightened. After reaching the set tension value, the position of the tightening sleeve on the working anchor is adjusted, and the tightening sleeve is used to lock the second connecting rod. At the same time, the lock nut is turned to lock the first connecting rod, thereby locking the tension value. Finally, the jack and tool anchor are removed to complete the construction.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A construction structure of an uplift anchor, characterized by: It includes first connecting rod (1) and second connecting rod (2), first connecting rod (1) end and end head (3) are connected, second connecting rod (2) end and anchor plate (4) are connected, anchor plate (4) is slidably arranged on end head (3), end head (3) is circumferentially hinged with several expansion arms (5), anchor plate (4) is provided with guide limiting structure matched with expansion arm (5); The other end of the first connecting rod (1) and the second connecting rod (2) is connected with the working anchor (6).

2. A pull-up anchor construction according to claim 1, characterized in that: The end head (3) is a T-shaped end head, and a through hole (8) is arranged in the middle of the end head (3) to allow the first connecting rod (1) to pass through.

3. A construction structure of a pull-out anchor according to claim 2, characterized in that: The front end of the through hole (8) is provided with a tapered hole, and the end of the first connecting rod (1) is provided with a tightening sleeve (9) matched with the tapered hole.

4. A construction structure of a pull-out anchor according to claim 3, characterized in that: The anchor plate (4) is provided with a stepped hole (10) matched with the end head (3) at the axis, and a plurality of tapered holes are circumferentially arranged on the anchor plate (4), and the end of the second connecting rod (2) is provided with a tightening sleeve (9) matched with the tapered hole.

5. A pull-up anchor construction according to claim 4, c h a r a c t e r i z e d in that: The guide limiting structure includes circumferentially equidistantly arranged accommodating grooves (11) on the anchor plate (4), and limiting guide columns (12) and limiting blocks (13) matched with the expansion arms (5) are arranged in the accommodating grooves.

6. A pull-up anchor construction according to claim 5, c h a r a c t e r i z e d in that: The end head (3) is circumferentially provided with a plurality of open grooves (14), and one end of the expansion arm (5) is hingedly connected with the open groove (14).

7. A pull-up anchor construction according to claim 6, c h a r a c t e r i z e d in that The expansion arm (5) is a rectangular strip, a hinge shaft is arranged in the open groove (14), one end of the expansion arm (5) is provided with a through hole, and the hinge shaft is matched with the through hole to realize hinging.

8. A pull-up anchor construction according to claim 7, characterised in that: The end head (3) is provided with an anti-dropping ring (15), and a positioning groove (16) and a positioning protrusion (17) are matched between the end head (3) and the stepped hole (10).

9. A pull-up anchor construction according to claim 7 or 8, c h a r a c t e r i z e d in that: The working anchor (6) includes a disc body, a plurality of tapered holes matched with the end of the second connecting rod (2) are arranged on the disc body, the end of the second connecting rod (2) is provided with a tightening sleeve (9) matched with the tapered hole, a through hole is arranged in the middle of the disc body, an external thread is arranged on the outer end of the first connecting rod (1), and a locking nut (18) matched with the external thread is rotatably arranged in the through hole.

10. A pull-up anchor construction according to claim 9, characterized in that: The tightening sleeve (9) is a tapered sleeve, and a contraction seam (19) is arranged on the tapered sleeve.

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