Multi-channel grouting sealing tail shield of pipe jacking machine for karst cave stratum

Abstract

The utility model discloses a tube push bench multichannel grouting sealing tail shield for a karst cave stratum, which comprises a tail shield shell, a supporting table is arranged in the tail shield shell, a multichannel grouting tube, a grease tube and a port anti-seepage mechanism are arranged in the supporting table, the port anti-seepage mechanism comprises a placing groove, an electric telescopic rod, a sliding rod, a back shore and an anti-corrosion wear-resistant sealing ring, and the lower end of the grease tube is connected with a sealing brush. The multi-channel grouting pipes and the grease pipes are evenly distributed, an anti-seepage ring is arranged on a communicating hole in the front end of the containing groove, a sliding groove is formed in the supporting table, and a sealing ring groove is formed in the tail shield shell. By means of the structure, the multi-channel grouting pipe can effectively conduct grouting reinforcement on the karst cave stratum, the grease pipe is matched with the sealing brush to achieve sealing friction reduction, the end opening anti-seepage mechanism prevents mortar from seeping out, all the structures work cooperatively, the safety and reliability of the pipe jacking machine in karst cave stratum construction are remarkably improved, and it is guaranteed that construction is conducted smoothly.

Description

Technical Field

[0001] This utility model relates to the field of underground engineering construction technology, and in particular to a multi-channel grouting sealing tail shield for pipe jacking machines used in karst formations. Background Technology

[0002] Pipe jacking technology is widely used in underground engineering construction. However, when faced with karst formations, traditional construction methods encounter severe challenges. Karst formations have complex structures with numerous cavities and fissures, resulting in extremely poor ground stability. During pipe jacking operations, ground collapse is very likely to occur, causing soil and water loss around the pipe segments, seriously threatening construction safety and greatly increasing the risk of project quality problems.

[0003] Meanwhile, karst caves often contain groundwater or corrosive media, which ordinary pipe jacking machine tail shield sealing structures cannot withstand. They not only fail to effectively prevent mortar seepage but also cannot withstand corrosion and wear, resulting in frequent sealing failures that seriously hinder the construction process. Therefore, there is an urgent need for a pipe jacking machine sealing tail shield that is suitable for karst cave strata. It must not only be able to accurately grout and reinforce the karst cave strata to enhance the stability of the strata, but also have excellent sealing performance to prevent impurities from entering and ensure that the pipe jacking machine can operate reliably and stably in complex karst cave environments. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, providing a multi-channel grouting sealing tail shield for pipe jacking machines in karst formations. This provides reliable port seepage prevention. The port seepage prevention mechanism is driven by an electric telescopic rod to push the anti-corrosion and wear-resistant sealing ring outwards into close contact with the soil layer, effectively preventing mortar from seeping out of the port. This avoids problems such as ground subsidence and soil erosion around the pipe segments caused by mortar leakage, ensuring the safety and quality of construction. Furthermore, the seepage prevention ring inside the connecting hole at the front end of the installation trench further enhances the seepage prevention effect, preventing liquid and silt from leaking out of the installation trench. This design improves the overall sealing performance of the tail shield. The flexible structural design, the sliding groove on the support platform, and the sealing ring groove on the tail shield shell provide sliding guidance and installation positions for the top support and the corrosion-resistant and wear-resistant sealing ring, enabling them to function accurately. Multiple evenly distributed electric telescopic rods provide stable power for the top support, ensuring the consistency and reliability of the lifting of the corrosion-resistant and wear-resistant sealing ring. The number of top supports corresponds one-to-one with the number of electric telescopic rods, further optimizing the operation of the port seepage prevention mechanism. This makes the entire sealing tail shield structure more flexible and stable, adapting to different construction conditions and requirements.

[0005] This utility model also provides a multi-channel grouting sealing tail shield for a pipe jacking machine used in karst formations, a tail shield shell, a support platform inside the tail shield shell, a multi-channel grouting pipe inside the support platform, a grease pipe inside the support platform, and a port seepage prevention mechanism inside the support platform.

[0006] The port seepage prevention mechanism includes a placement groove and an electric telescopic rod. The bottom of the placement groove is fixedly connected to the electric telescopic rod. A sliding rod is fixedly connected to the front end of the electric telescopic rod. A top support is fixedly connected to the front end of the sliding rod. A corrosion-resistant and wear-resistant sealing ring is fixedly connected to the outer surface of the top support.

[0007] According to the multi-channel grouting sealing tail shield of the pipe jacking machine for karst formations, the lower end of the grease pipe is provided with a sealing brush, the upper end of the sealing brush is fixedly connected to the inner wall of the support platform, and the lower end of the sealing brush is in close contact with the pipe segment.

[0008] According to the multi-channel grouting sealing tail shield of the pipe jacking machine for karst formation, the number of multi-channel grouting pipes is multiple and evenly distributed inside the support platform, and the number of grease pipes is multiple and evenly distributed inside the support platform.

[0009] According to the multi-channel grouting sealing tail shield of the pipe jacking machine for karst formations, the front end of the placement groove is connected to a connecting hole, and the inner wall of the connecting hole is fixedly connected to an anti-seepage ring, and the inner wall of the anti-seepage ring is slidably connected to a sliding rod.

[0010] According to the multi-channel grouting sealing tail shield of the pipe jacking machine for karst formations, the support platform is provided with a sliding groove near its outer surface, and the inner wall of the sliding groove is slidably connected to the top support.

[0011] According to the multi-channel grouting sealing tail shield of the pipe jacking machine for karst formations, the outer shell of the tail shield is provided with a sealing ring groove near the outer surface, and the inner wall of the sealing ring groove is slidably connected to the corrosion-resistant and wear-resistant sealing ring.

[0012] According to the multi-channel grouting sealing tail shield of the pipe jacking machine for karst formations, the number of electric telescopic rods is multiple and evenly distributed in the placement groove inside the support platform.

[0013] According to the multi-channel grouting sealing tail shield of the pipe jacking machine used in karst formations, the number of the top supports is multiple and corresponds one-to-one with the electric telescopic rods.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 This is an overall structural diagram of the multi-channel grouting sealing tail shield for the pipe jacking machine used in karst formations according to this utility model;

[0017] Figure 2 This is a diagram of the port seepage prevention structure of the multi-channel grouting sealing tail shield of the pipe jacking machine used in karst formations according to this utility model;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 This is a cross-sectional view of the multi-channel grouting sealing tail shield of the pipe jacking machine used in karst formations according to this utility model.

[0020] Legend:

[0021] 1. Tail shield shell; 2. Corrosion-resistant and wear-resistant sealing ring; 3. Multi-channel grouting pipe; 4. Pipe segment; 5. Sealing ring groove; 6. Support platform; 7. Top support; 8. Slide groove; 9. Connecting hole; 10. Installation groove; 11. Electric telescopic rod; 12. Anti-seepage ring; 13. Slide rod; 14. Grease pipe; 15. Sealing brush. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] Reference Figure 1-4 This utility model embodiment is used for a multi-channel grouting sealing tail shield of a pipe jacking machine in karst formations. It includes a tail shield shell 1, a support platform 6 inside the tail shield shell 1, a multi-channel grouting pipe 3 inside the support platform 6, a grease pipe 14 inside the support platform 6, and a port anti-seepage mechanism inside the support platform 6. A sealing brush 15 is provided at the lower end of the grease pipe 14, the upper end of the sealing brush 15 is fixedly connected to the inner wall of the support platform 6, and the lower end of the sealing brush 15 is in close contact with the pipe segment 4 for sealing and friction reduction. The number of multi-channel grouting pipes 3 is multiple and evenly distributed inside the support platform 6, and the number of grease pipes 14 is multiple and evenly distributed inside the support platform 6 to ensure the grouting and grease sealing effect.

[0024] The port seepage prevention mechanism includes a placement groove 10 and an electric telescopic rod 11. The bottom of the placement groove 10 is fixedly connected to the electric telescopic rod 11. A sliding rod 13 is fixedly connected to the front end of the electric telescopic rod 11. A top support 7 is fixedly connected to the front end of the sliding rod 13. A corrosion-resistant and wear-resistant sealing ring 2 is fixedly connected to the outer surface of the top support 7. A connecting hole 9 is connected to the front end of the placement groove 10. A seepage prevention ring 12 is fixedly connected to the inner wall of the connecting hole 9. The inner wall of the seepage prevention ring 12 is slidably connected to the sliding rod 13 to enhance the seepage prevention performance of the port seepage prevention mechanism. A support platform 6 is also included. A groove 8 is provided near the outer surface, and the inner wall of the groove 8 is slidably connected to the top support 7 to guide the movement of the top support 7. A sealing ring groove 5 is provided near the outer surface of the tail shield shell 1, and the inner wall of the sealing ring groove 5 is slidably connected to the anti-corrosion and wear-resistant sealing ring 2 to enhance the sealing effect. There are multiple electric telescopic rods 11, which are evenly distributed in the placement grooves 10 inside the support platform 6 to provide power for the port seepage prevention mechanism. There are multiple top supports 7, which correspond one-to-one with the electric telescopic rods 11 to ensure the effective operation of the port seepage prevention mechanism.

[0025] Working principle: The support platform 6 inside the tail shield shell 1 is equipped with multiple grouting pipes 3, which are evenly distributed. During construction, different types of grout can be injected into the karst formation through these multiple grouting pipes 3 to reinforce the formation, fill the voids in the karst cave, etc., to meet different engineering needs. According to specific construction requirements and formation conditions, the grouting volume and grouting pressure of each grouting pipe can be flexibly controlled to achieve effective reinforcement and treatment of the formation. Multiple grease pipes 14 are also evenly distributed inside the support platform 6. The lower end of the grease pipes 14 is equipped with... The sealing brush 15 is fixedly connected to the inner wall of the support platform 6 at its upper end and in close contact with the pipe segment 4 at its lower end. During the advancement of the pipe jacking machine, grease is injected into the sealing brush 15 through the grease pipe 14. The grease forms a grease sealing layer on the contact surface between the sealing brush 15 and the pipe segment 4. On the one hand, it can reduce the friction between the tail shield of the pipe jacking machine and the pipe segment 4, making the advancement of the pipe jacking machine smoother. On the other hand, the grease sealing layer can effectively prevent water, mud and sand and other substances in the stratum from entering the interior of the tail shield, playing a good sealing role and protecting the equipment and structure inside the tail shield.

[0026] The port seepage prevention mechanism consists of a placement groove 10, an electric telescopic rod 11, a sliding rod 13, a top support 7, and a corrosion-resistant and wear-resistant sealing ring 2. Multiple electric telescopic rods 11 are evenly distributed within the placement groove 10 inside the support platform 6. Multiple top supports 7 also correspond one-to-one with the electric telescopic rods 11. When it is necessary to prevent mortar from seeping out of the port during pipe jacking construction, the electric telescopic rod 11 is activated and extended, pushing the sliding rod 13 forward. The sliding rod 13 drives the top support 7 to slide forward along the sliding groove 8 of the support platform 6. As the top support 7 moves forward, the corrosion-resistant and wear-resistant sealing ring 2, fixedly connected to it, gradually rises outward until it is tightly sealed with the surrounding soil layer. The anti-corrosion and wear-resistant sealing ring 2 is in close contact with the soil layer. Through the extension and retraction control of the electric telescopic rod 11, the lifting force and position of the anti-corrosion and wear-resistant sealing ring 2 can be adjusted according to the actual situation to form a reliable seal between it and the soil layer, effectively preventing mortar from seeping out from the tail shield port. At the same time, the anti-corrosion and wear-resistant sealing ring 2 also fits tightly against the inner wall of the sealing ring groove 5 of the tail shield shell 1, further enhancing the sealing effect. The inner wall of the connecting hole 9 at the front end of the placement groove 10 is fixedly connected to the seepage prevention ring 12. The seepage prevention ring 12 is slidably connected to the sliding rod 13. During the sliding of the sliding rod 13, the seepage prevention ring 12 can further prevent liquid and silt from seeping out from the placement groove 10, improving the overall seepage prevention performance.

[0027] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A multi-channel grouting sealing tail shield for pipe jacking machines used in karst formations, characterized in that, include: Tail shield shell (1), the tail shield shell (1) is provided with a support platform (6), the support platform (6) is provided with a multi-channel grouting pipe (3), the support platform (6) is provided with a grease pipe (14), and the support platform (6) is provided with a port anti-seepage mechanism. The port seepage prevention mechanism includes a placement groove (10) and an electric telescopic rod (11). The bottom of the placement groove (10) is fixedly connected to the electric telescopic rod (11). A sliding rod (13) is fixedly connected to the front end of the electric telescopic rod (11). A top support (7) is fixedly connected to the front end of the sliding rod (13). A corrosion-resistant and wear-resistant sealing ring (2) is fixedly connected to the outer surface of the top support (7).

2. The multi-channel grouting sealing tail shield for pipe jacking machines in karst formations according to claim 1, characterized in that, The lower end of the grease tube (14) is provided with a sealing brush (15), the upper end of the sealing brush (15) is fixedly connected to the inner wall of the support platform (6), and the lower end of the sealing brush (15) is in close contact with the tube segment (4).

3. The multi-channel grouting sealing tail shield for pipe jacking machines in karst formations according to claim 1, characterized in that, The number of multi-channel grouting pipes (3) is multiple and evenly distributed inside the support platform (6), and the number of grease pipes (14) is multiple and evenly distributed inside the support platform (6).

4. The multi-channel grouting sealing tail shield for pipe jacking machines in karst formations according to claim 1, characterized in that, The front end of the placement groove (10) is connected to a connecting hole (9), and the inner wall of the connecting hole (9) is fixedly connected to a seepage-proof ring (12), and the inner wall of the seepage-proof ring (12) is slidably connected to the slide rod (13).

5. The multi-channel grouting sealing tail shield for pipe jacking machines in karst formations according to claim 1, characterized in that, The support platform (6) is provided with a sliding groove (8) near its outer surface, and the inner wall of the sliding groove (8) is slidably connected to the top support (7).

6. The multi-channel grouting sealing tail shield for pipe jacking machines in karst formations according to claim 1, characterized in that, The tail shield shell (1) is provided with a sealing ring groove (5) near its outer surface, and the inner wall of the sealing ring groove (5) is slidably connected to the corrosion-resistant and wear-resistant sealing ring (2).

7. The multi-channel grouting sealing tail shield for pipe jacking machines in karst formations according to claim 1, characterized in that, The electric telescopic rods (11) are numerous and evenly distributed in the mounting slots (10) inside the support platform (6).

8. The multi-channel grouting sealing tail shield for pipe jacking machines in karst formations according to claim 1, characterized in that, The number of top supports (7) is multiple and corresponds one-to-one with the electric telescopic rods (11).

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