A needle head for needle injection of grout in shield tunneling

Abstract

The utility model relates to grouting needle technical field, and disclose a kind of shield tunnel needle punching grouting needle, including needle main part, the tail portion of needle main part is welded with connecting pipe, the tail portion of connecting pipe integrally formed with outer thread pipe, outer thread pipe is connected with grouting machine grouting spout when grouting;The inside of connecting pipe and needle main part is inserted with the inner rod that can be pulled out, the utility model can be inserted into the borehole of impact drill with needle main part, after insertion is completed, inner rod is extracted, the head portion of needle main part cannot remain gasket material, to effectively avoid the step that traditional construction needs to use iron drill repeatedly to punch extrusion blockage, significantly improve construction efficiency;Meanwhile, by being equipped with fixed bracket, needle main part can be supported, need not person to support, and ensure that needle main part is straight line state, avoid needle main part to occur in construction process and shift, improve the accuracy of puncture.

Description

Technical Field

[0001] This utility model relates to the field of grouting needle technology, and more specifically to a needle grouting needle for shield tunnels. Background Technology

[0002] As a crucial infrastructure component of subway systems, the health of tunnels directly impacts subway operation safety. In particular, water leakage in tunnel segments within soft soil layers is a common problem. If not addressed promptly, this leakage can accumulate over time, leading to tunnel seepage and cracking, severely affecting the tunnel's normal functionality.

[0003] Currently, the main methods for addressing water leakage in pipe segments are local grouting and chemical grouting. Although these methods have plugged the leaks, they have a high repair rate and poor stability, leading to frequent re-leakage over time. Using needle grouting can greatly improve the quality of the project. However, after the existing puncture needle penetrates the elastic rubber sealing gasket, a 5cm long elastic sealing gasket remains inside the needle tip. It is necessary to use an iron rod to insert into the needle tip and push back and forth to squeeze out the sealing gasket material blocking the needle tip, resulting in low construction efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a rice crust cutting device to solve the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a shield tunnel needle grouting needle, including a needle body, a connecting pipe welded to the tail of the needle body, and an external threaded pipe integrally formed at the tail of the connecting pipe, which is connected to the grouting nozzle of the grouting machine during grouting. The connecting tube and the needle body have a removable inner rod inserted inside. The outer side of the external threaded tube is threaded to an internal threaded cylinder. The inner wall of the internal threaded cylinder is provided with an internal thread that matches the external threaded tube. The inner rod rotates at the top of the internal threaded cylinder. The bottom of the inner rod tip is integrally formed with an insert block, and the top of the external threaded tube has a slot for inserting the insert block.

[0006] As a further embodiment of this utility model, a fixing bracket is sleeved on the outer side of the needle body; The fixing bracket includes two limiting rings, which are fitted around the outer circumference of the needle body; Three fixing rods are equidistantly distributed in a circle on the outer side of the two limiting rings; The mounting ring is welded to the fixing rod. The combination of the fixing rod, the limiting ring, and the mounting ring forms a stable triangular support structure.

[0007] As a further embodiment of this invention, the bottom of the mounting ring is provided with a support member that makes the fixing bracket perpendicular to the inner wall.

[0008] As a further embodiment of this utility model, the support member is a contour ring frame, which is fixed to the mounting ring by screws and nuts, and the bottom of the contour ring frame is in close contact with the outer wall of the tunnel segment contact surface.

[0009] As a further embodiment of this utility model, the support member is a strut, which is fixed to the mounting ring by a screw and a nut, and a tubular level is provided at the top of the strut.

[0010] As a further embodiment of this invention, both the head of the needle body and the head of the inner rod have a beveled structure.

[0011] As a further embodiment of this utility model, the outer circumferential wall of the mounting ring is provided with a plurality of mounting holes that are equidistantly distributed in a circular pattern. The mounting holes are through holes and are used to install the fixing bracket onto the contact surface of the tunnel segment.

[0012] As a further embodiment of this utility model, multiple elastic clamps are fixed to the outside of the front limiting ring by bolts, and the elastic clamps clamp the needle body that passes through the limiting ring.

[0013] By adopting the above technical solution, no sealing gasket material is left inside the head of the needle body.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model has a removable inner rod inserted into the inside of the connecting tube and the needle body. It can be inserted into the drill hole of the impact drill together with the needle body. After insertion, the inner rod is pulled out. No sealing gasket material will remain in the head of the needle body, thus effectively avoiding the step of repeatedly poking and squeezing the blockage with an iron rod in traditional construction, and significantly improving construction efficiency.

[0015] 2. This utility model uses the cooperation of the insert block and the slot. When the insert block is inserted into the slot, it limits the inner rod and prevents the inner rod from rotating inside the needle body. This ensures that the beveled structure of the needle body and the head of the inner rod are flush and can smoothly penetrate the elastic rubber sealing gasket.

[0016] 3. This utility model has a fixed bracket that can support the needle body without human assistance and ensures that the needle body is in a straight line, preventing the needle body from shifting during the operation and improving the accuracy of puncture. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model.

[0018] Figure 2 This is Embodiment 1 of the present utility model. Figure 1 Enlarged schematic diagram of the fixed bracket in the middle.

[0019] Figure 3 This is Embodiment 1 of the present utility model. Figure 2 A schematic diagram of the overall exploded structure.

[0020] Figure 4 This is an enlarged structural schematic diagram of the fixed bracket in Embodiment 2 of this utility model.

[0021] In the diagram: 1. Needle body; 2. Connecting tube; 3. Fixing bracket; 301. Fixing rod; 302. Limiting ring; 303. Mounting ring; 304. Mounting hole; 4. External threaded tube; 5. Internal threaded cylinder; 6. Elastic clamp; 7. Contour ring frame; 8. Insert block; 9. Slot; 10. Inner rod; 11. Support rod; 12. Tube level. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. This utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Example 1 Please see Figure 1-3 This utility model provides a technical solution: a shield tunnel needle grouting needle, including a needle body 1, the needle body 1 having an outer diameter of 5mm, an inner diameter of 3mm, and a length of 400mm, a 40mm long connecting pipe 2 welded to the tail of the needle body 1, the tail of the connecting pipe 2 having an external threaded pipe 4 integrally formed, the external threaded pipe 4 being connected to the grouting nozzle of the grouting machine during grouting. The connecting tube 2 and the needle body 1 have a removable inner rod 10 inserted inside. The inner rod 10 is a steel rod that can be inserted into the drill hole of the impact drill together with the needle body 1. After insertion, the inner rod 10 is pulled out. No sealing gasket material will remain in the head of the needle body 1, thus effectively avoiding the step of repeatedly poking and squeezing the blockage with an iron rod in traditional construction, and significantly improving construction efficiency.

[0024] The outer thread of the external threaded tube 4 is connected to the internal threaded cylinder 5. The length of the internal threaded cylinder 5 is 30mm, and its inner wall is provided with an internal thread that is compatible with the external threaded tube 4. The inner rod 10 rotates at the top of the internal threaded cylinder 5, thereby limiting the inner rod 10 inserted into the needle body 1. Meanwhile, the bottom of the top of the inner rod 10 is integrally formed with a plug 8, and the top of the external thread tube 4 is provided with a slot 9 for the plug 8 to be inserted. When the plug 8 is inserted into the slot 9, it will limit the inner rod 10 and prevent the inner rod 10 from rotating inside the needle body 1. In addition, both the head of the needle body 1 and the inner rod 10 have a beveled structure, which can smoothly penetrate the elastic rubber sealing gasket.

[0025] A fixing bracket 3 is sleeved on the outside of the needle body 1. The fixing bracket 3 includes two limiting rings 302. The limiting rings 302 are sleeved on the outside of the circumference of the needle body 1. The two limiting rings 302 can ensure that the needle body 1 is in a straight state, avoid the needle body 1 from shifting during the construction process, and improve the accuracy of puncture. Three fixing rods 301 are welded to the outer circumference of each of the two limiting rings 302. The other end of the fixing rods 301 is welded to the mounting ring 303 to form a stable triangular support structure, which enhances the overall structural strength of the fixing bracket 3. The bottom of the mounting ring 303 is provided with a support member that makes the fixing bracket 3 perpendicular to the inner wall. The support member is a contour ring frame 7. The contour ring frame 7 is fixed to the mounting ring 303 by screws and nuts. The bottom of the contour ring frame 7 is in close contact with the outer wall of the tunnel segment contact surface, which further enhances the stability of the needle installation and prevents the needle from shifting due to vibration during grouting. The mounting ring 303 has multiple mounting holes 304 that are equidistantly distributed around its circumference on its outer circumferential wall. The mounting holes 304 are through holes and can be used to install the fixing bracket 3 onto the contact surface of the tunnel segment to fix the fixing bracket 3. At the same time, it is ensured that the front end of the needle body 1 is fixed along the normal direction of the contact surface of the tunnel segment. When installing the fixing bracket 3, two horizontally opposite mounting holes 304 are aligned with the joint of the segment, and the fixing bracket 3 is vertically fixed to the tunnel segment using expansion bolts.

[0026] Multiple elastic clamps 6 are provided on the outer side of the front limiting ring 302. The elastic clamps 6 are arc-shaped springs made of elastic metal, preferably leaf springs. One end of the springs is connected by bolts, which can clamp the needle body 1, thereby increasing the friction between the fixed bracket 3 and the needle body 1, and making it less likely for the needle body 1 to fall off.

[0027] The working principle of this utility model: First, drill a hole at the tunnel segment penetration joint using an impact drill until it reaches the elastic rubber gasket, and then install the fixing bracket 3 on the tunnel segment joint. Subsequently, the needle body 1 and the inner rod 10 are simultaneously passed through the limiting ring 302 and inserted into the borehole. The two limiting rings 302 can ensure that the needle body 1 is in a straight line state, and at the same time ensure that the front end of the needle body 1 is fixed along the normal direction of the tunnel segment contact surface. After the puncture is completed, the inner rod 10 is pulled out. At this time, no sealing gasket material will remain in the head of the needle body 1, thus effectively avoiding the step of repeatedly poking and squeezing the blockage with an iron rod in traditional construction, and significantly improving construction efficiency. Finally, cement grout is injected through the connector at the end of the needle into the grout tube, and a waterstop is formed after waiting for the pre-set grout gel time.

[0028] It should be noted that after use, water should be injected to squeeze out all the grout remaining inside the grout nozzle to ensure that the needle body 1 can be reused.

[0029] Example 2 Please see Figure 4 A shield tunnel needle grouting needle has a support member of a strut 11. The strut 11 is fixed to the mounting ring 303 by a screw and a nut. A tube level 12 is provided on the top of the strut 11. The tube level 12 can visually display whether the strut 11 is in a horizontal state, thereby helping to determine whether the fixed bracket 3 is perpendicular to the contact surface of the tunnel segment, and ensuring that the installation angle of the needle body 1 meets the construction requirements.

[0030] Compared to the contour ring frame 7 in Embodiment 1, the support rod 11 has a simpler structure and a more convenient adjustment method, making it suitable for construction scenarios where the installation space is limited or the surface flatness of the pipe segment is relatively good.

[0031] Finally, the following points should be noted: In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change. The electronic components and modules used in this utility model can all be parts that are commonly used in the market and can achieve the specific functions in this case. The specific models and sizes can be selected and adjusted according to actual needs. The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

Claims

1. A grouting needle for shield tunneling, comprising a needle body (1), characterized in that: The needle body (1) has a connecting tube (2) welded to its tail. The tail of the connecting tube (2) is integrally formed with an external threaded tube (4). The external threaded tube (4) is connected to the grouting nozzle of the grouting machine during grouting. The connecting tube (2) and the needle body (1) are fitted with a removable inner rod (10). The outer thread of the external thread tube (4) is connected to an internal thread cylinder (5). The inner wall of the internal thread cylinder (5) is provided with an internal thread that is compatible with the external thread tube (4). The inner rod (10) rotates at the top of the internal thread cylinder (5). The bottom of the top of the inner rod (10) is integrally formed with a plug (8), and the top of the external threaded tube (4) is provided with a slot (9) for the plug (8) to be inserted.

2. The grouting needle for shield tunneling according to claim 1, characterized in that: A fixing bracket (3) is sleeved on the outside of the needle body (1). The fixing bracket (3) includes two limiting rings (302), which are fitted around the outer circumference of the needle body (1); Three fixing rods (301) are equidistantly distributed in a circle on the outer side of the two limiting rings (302); The mounting ring (303) is welded to the fixing rod (301); The fixed rod (301), the limiting ring (302), and the mounting ring (303) combine to form a stable triangular support structure.

3. The grouting needle for shield tunneling according to claim 2, characterized in that: The bottom of the mounting ring (303) is provided with a support member that makes the fixing bracket (3) perpendicular to the inner wall.

4. The grouting needle for shield tunneling according to claim 3, characterized in that: The support is a contour ring frame (7), which is fixed to the mounting ring (303) by screws and nuts. The bottom of the contour ring frame (7) is in close contact with the outer wall of the tunnel segment contact surface.

5. A grouting needle for shield tunneling according to claim 3, characterized in that: The support is a strut (11), which is fixed to the mounting ring (303) by a screw and nut. A tube level (12) is provided on the top of the strut (11).

6. The grouting needle for shield tunneling according to claim 1, characterized in that: The head of both the needle body (1) and the inner rod (10) has a beveled structure.

7. A grouting needle for shield tunneling according to claim 2, characterized in that: The mounting ring (303) has multiple mounting holes (304) that are equidistantly distributed in a circular pattern on its outer circumferential wall. The mounting holes (304) are through holes used to install the fixing bracket (3) onto the contact surface of the tunnel segment.

8. A grouting needle for shield tunneling according to claim 2, characterized in that: Multiple elastic clamps (6) are fixed to the outside of the front limiting ring (302) by bolts. The elastic clamps (6) clamp the needle body (1) that passes through the limiting ring (302).

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