A TBM tunneling anchor positioning device

Abstract

The utility model discloses a TBM driving anchor rod positioning device, including anchor rod, the outer wall of anchor rod is provided with screw threads, and the inner chamber of anchor rod is hollow setting, the bottom welding of anchor rod has the anchor head, the outer wall of anchor head is seted up and has vertical strip through -hole, the inner chamber of anchor head is hollow setting, and the bottom setting of anchor head is concave, and the outer wall of anchor head is fixedly connected with the positioning structure. The device is applied to the positioning link of anchor rod during TBM driving, ensures that the anchor rod is in the middle, the positioning structure can prevent the anchor rod from deviating or contacting the hole wall in the grouting process, avoids forming " dry hole section " to cause grouting not to be dense, improves the uniformity of anchoring force, and the central anchor rod makes the slurry evenly wrap the pole body, forms the complete anchoring body, and the standard preparation work and operation process are the basis of grouting anchor rod construction, and through the vertical strip through -hole of anchor head and hollow setting, the grouting quality is optimized.

Description

Technical Field

[0001] This utility model relates to the field of TBM tunneling anchor bolt positioning technology, specifically to a TBM tunneling anchor bolt positioning device. Background Technology

[0002] In TBM (Tunnel Boring Machine) excavation, rock bolts are a crucial component of the initial support system, holding immense engineering significance. During TBM excavation, the original rock mass is disturbed, causing loosening and stress redistribution. Rock bolts, anchored deep within relatively intact rock strata, connect the loosened rock mass to the deeper, stable rock mass, forming a "composite beam" or "suspension effect." This improves the integrity and self-stabilizing capacity of the surrounding rock, delaying or preventing deformation and collapse. Rock bolts effectively limit loosening and displacement of the surrounding rock, especially under conditions of weak rock or high ground stress. Timely application of rock bolt support can significantly reduce tunnel convergence deformation, preventing damage or encroachment to the lining structure due to excessive deformation.

[0003] If anchor bolts deviate from their designed positions, especially in weak or fractured surrounding rock, they may not be effectively anchored to deep, stable rock strata, resulting in insufficient anchoring force. If anchor bolts are too sparsely or too densely distributed, blind spots will form, failing to effectively control surrounding rock deformation and leading to an expansion of the loosened rock zone and intensified deformation. Therefore, we have developed a TBM (Tunnel Boring Machine) anchor bolt positioning device. Utility Model Content

[0004] The purpose of this invention is to provide a TBM (Tunnel Boring Machine) anchor bolt positioning device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a TBM tunneling anchor bolt positioning device, comprising an anchor bolt, the outer wall of which is threaded and the inner cavity of which is hollow, an anchor head welded to the bottom of the anchor bolt, a vertical strip-shaped through hole opened on the outer wall of the anchor head, the inner cavity of which is also hollow and the bottom of which is provided with a concave opening, and a positioning structure fixedly connected to the outer wall of the anchor head.

[0006] Preferably, the positioning structure includes an annular block, the inner ring wall of which is fixedly connected to the outer wall of the anchor head and located on the outer wall of the anchor head near the bottom. A connecting rod is fixedly connected to each of the four corners of the outer ring wall of the annular block. The inner cavity of the connecting rod is threaded, and a screw is threaded to the threaded part of the inner cavity of the connecting rod. A round rod is fixedly connected to the outer end of the screw, and the end of the round rod fits against the end of the connecting rod.

[0007] Preferably, the outer wall of the anchor rod is threaded with a screw barrel grout stop plug near the top. The bottom of the screw barrel grout stop plug is tapered, and the top of the screw barrel grout stop plug has an annular protrusion with a square hole.

[0008] Preferably, a tray is fastened to the upper surface of the screw barrel stop plug, and a cylindrical protrusion is provided at the bottom of the tray. The cylindrical protrusion of the tray is fastened to the inner wall of the annular protrusion of the screw barrel stop plug with clearance fit. The tray is disc-shaped and has a downward curvature.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This device is applied to the positioning of anchor rods during TBM tunneling, ensuring that the anchor rods are centered. The positioning structure can prevent the anchor rods from shifting or contacting the hole wall during grouting, avoiding the formation of "dry hole sections" that lead to incomplete grouting, improving the uniformity of anchoring force. The centered anchor rods allow the grout to evenly coat the rod body, forming a complete anchor body. Standardized preparation and operation procedures are the foundation for grouting anchor rod construction. At the same time, the vertical strip-shaped through hole and hollow setting of the anchor head optimize the grouting quality.

[0010] This product is equipped with a screw-type grout stopper and a tray that can be combined with anchor bolts. The screw-type grout stopper can fully fill the gaps around the anchor bolt to form a complete anchor body and improve the anchoring force. The tray is used to adjust the force direction of the anchor bolt, enhancing the stability and fatigue resistance of the anchoring system. The combination of the two can ensure that the anchor bolt system works reliably under various engineering conditions and improve the overall support effect. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 for Figure 1 Detailed structural diagram of the middle anchor head;

[0013] Figure 3 for Figure 1 Detailed structural diagram of the middle tray;

[0014] Figure 4 for Figure 1 Detailed structural diagram of the slurry stop plug in the middle screw barrel;

[0015] In the diagram: 1. Anchor bolt; 2. Anchor head; 3. Screw plug; 4. Tray; 5. Positioning structure; 51. Annular block; 52. Connecting rod; 53. Screw; 54. Round rod. Detailed Implementation

[0016] 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.

[0017] Please see Figure 1-4 This utility model provides a technical solution: a TBM (Tunnel Boring Machine) anchor bolt positioning device, including an anchor bolt 1. The outer wall of the anchor bolt 1 is threaded, and the inner cavity of the anchor bolt 1 is hollow. An anchor head 2 is welded to the bottom of the anchor bolt 1. The outer wall of the anchor head 2 has a vertical strip-shaped through hole, and the inner cavity of the anchor head 2 is also hollow. A concave opening is provided at the bottom of the anchor head 2. A positioning structure 5 is fixedly connected to the outer wall of the anchor head 2. By welding the anchor head 2 to the bottom of the anchor bolt 1, a drilling rig is used to drill a hole at the designed angle and depth, controlling the hole diameter to be slightly larger than the diameter of the anchor bolt 1. After drilling, the hole is cleaned with high-pressure air or water flushing to ensure... Ensure the borehole is free of rock debris and water accumulation. Insert the anchor rod into the borehole and support it against the borehole wall using the positioning structure 5. Ensure the rod is centered and avoid contact with the borehole wall, which could affect the grouting effect. Inject grout into the hollow cavity of the anchor rod 1 through the grouting pipe and discharge it through the vertical strip-shaped through-hole of the anchor head 2, which is connected to the bottom. Control the pressure and grouting speed at 0.5-2MPa. Since the bottom of the anchor head 2 has a concave opening, it can fit against the bottom of the borehole wall. Grouting can be completed without setting a control distance in the air. Adopt the principle of "low pressure, slow injection, and intermittent grouting" until grout returns to the borehole or the designed grouting volume is reached.

[0018] like Figure 2As shown, the positioning structure 5 includes an annular block 51. The inner annular wall of the annular block 51 is fixedly connected to the outer wall of the anchor head 2 and is located on the outer wall of the anchor head 2 near the bottom. A connecting rod 52 is fixedly connected to the four corners of the outer annular wall of the annular block 51. The inner cavity of the connecting rod 52 is threaded, and a screw 53 is threaded to the threaded part of the inner cavity of the connecting rod 52. A round rod 54 is fixedly connected to the outer end of the screw 53, and the end of the round rod 54 fits against the end of the connecting rod 52. During the assembly of the anchor rod 1, the positioning structure 5 is pre-set at the anchor head 2. The positioning structure 5 is welded to the outer wall of the anchor head 2 via the annular block 51. Simultaneously, the four corners of the annular block 51 are fixedly connected to the connecting rod 52. The corner is equipped with a connecting rod 52, which is threaded inside and can be connected to the screw rod 53 to fix the round rod 54. Round rods 54 of different lengths can be connected according to the specifications of the hole wall for support. They are inserted into the hole with a tight fit and support the hole wall. The round rods 54 in four directions work together to ensure that the anchor rod 1 is centered in the three-dimensional space of the hole and avoid tilting. This ensures that the anchor rod 1 is centered and that the grout can spread evenly, completely filling the gap between the anchor rod 1 and the hole wall to form a dense anchor body. This improves the adhesion between the anchor body and the surrounding rock and soil, significantly improves the pull-out resistance and shear resistance of the anchor rod, and avoids contact with the hole wall, which would affect the grouting effect.

[0019] like Figure 3 and Figure 4 As shown, a screw barrel grout stop plug 3 is threadedly connected to the outer wall of the anchor rod 1 near the top. The bottom of the screw barrel grout stop plug 3 is tapered, and the top of the screw barrel grout stop plug 3 has an annular protrusion with a square hole. As the screw barrel grout stop plug 3 is tightened, the tapered surface is gradually squeezed and deformed to achieve the effect of stopping grout at the top. The square hole design allows the use of a tightening square rod, such as an L-shaped wrench or a special tool, to accurately apply torque, avoiding the stripping problem that may occur with traditional hexagonal nuts. This makes it convenient for workers to quickly align the tool and prevents over-tightening that could damage the threads.

[0020] like Figure 3 and Figure 4 As shown, a tray 4 is fastened to the upper surface of the screw barrel grout stop plug 3. A cylindrical protrusion is provided at the bottom of the tray 4. The cylindrical protrusion of the tray 4 is fastened to the inner wall of the annular protrusion of the screw barrel grout stop plug 3 with a clearance fit. The tray 4 is disc-shaped and has a downward curvature. Both the tray 4 and the screw barrel grout stop plug 3 are made of metal. The specific material selection can be determined according to the construction environment. When the tension of the anchor rod 1 is directly applied to the screw barrel grout stop plug 3, the local stress concentration may cause the seal to fail or the structure to be damaged. The tray 4 is set at this location. Through the tray 4 as the force transmission medium, the tension of the anchor rod 1 is evenly distributed to the surrounding rock and soil or concrete structure to avoid local damage. The curved tray 4 forms a secondary sealing barrier for the screw barrel grout stop plug 3, further preventing grout leakage, ensuring full grouting, and improving the reliability of the overall anchoring system.

[0021] Working principle: This device is used for positioning anchor bolt 1 during TBM tunneling to ensure that the anchor bolt is centered. The positioning structure 5 can prevent the anchor bolt 1 from shifting or contacting the hole wall during grouting, avoiding the formation of "dry hole sections" that lead to incomplete grouting and improving the uniformity of anchoring force. The centered anchor bolt 1 allows the grout to evenly coat the rod body, forming a complete anchor body. Standardized preparation and operation procedures are the foundation for the construction of grouting anchor bolt 1. At the same time, the vertical strip-shaped through hole and hollow setting of the anchor head 2 optimize the grouting quality.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A TBM (Tunnel Boring Machine) anchor bolt positioning device, characterized in that: The system includes an anchor rod (1), the outer wall of which is threaded and the inner cavity of which is hollow. An anchor head (2) is welded to the bottom of the anchor rod (1). The outer wall of the anchor head (2) has a vertical strip-shaped through hole. The inner cavity of the anchor head (2) is also hollow, and the bottom of the anchor head (2) has a concave opening. A positioning structure (5) is fixedly connected to the outer wall of the anchor head (2). The positioning structure (5) includes an annular block (51). 1) The inner ring wall is fixedly connected to the outer wall of the anchor head (2) and is located on the outer wall of the anchor head (2) near the bottom. The four corners of the outer ring wall of the ring block (51) are fixedly connected to the connecting rod (52). The inner cavity of the connecting rod (52) is threaded. The threaded part of the inner cavity of the connecting rod (52) is threadedly connected to the screw (53). The outer end of the screw (53) is fixedly connected to the round rod (54). The end of the round rod (54) is in contact with the end of the connecting rod (52).

2. The TBM tunneling anchor positioning device according to claim 1, characterized in that: The outer wall of the anchor rod (1) is threaded with a screw barrel grout stop plug (3) near the top. The bottom of the screw barrel grout stop plug (3) is tapered, and the top of the screw barrel grout stop plug (3) has an annular protrusion and a square hole.

3. The TBM tunneling anchor positioning device according to claim 2, characterized in that: The upper surface of the screw barrel stop plug (3) is fitted with a tray (4), and the bottom of the tray (4) is provided with a cylindrical protrusion. The cylindrical protrusion of the tray (4) is engaged with the inner wall of the annular protrusion of the screw barrel stop plug (3) and is in clearance fit. The tray (4) is disc-shaped and has a downward curvature.

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