A grouting device for pipe jacking construction

Abstract

This invention relates to the field of pipe jacking construction equipment technology, and discloses a grouting device for pipe jacking construction, including a pipe body. A grouting mechanism is provided inside the pipe body. The grouting mechanism includes a grouting ring disposed inside the pipe body. One end of the grouting ring is connected to a first grouting pipe, and another end of the grouting ring is connected to the first grouting pipe via a second grouting pipe. A guide pipe is also connected to the outer periphery of the grouting ring. A rotating ring is slidably installed on the inner wall of the grouting ring. Multiple equidistantly distributed arc-shaped fins are fixedly installed on the outer periphery of the rotating ring. During the injection process, the grout will contact the arc-shaped fins, causing the arc-shaped fins and the rotating ring to rotate inside the grouting ring, guiding the grout inside the grouting ring so that grout is evenly distributed in all areas inside the grouting ring, reducing the occurrence of voids due to uneven grout injection.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking construction equipment technology, specifically to a grouting device for pipe jacking construction. Background Technology

[0002] Pipe jacking, a trenchless construction method, works by excavating two pits at intervals on the ground: a launching pit and a receiving pit. Inside the launching pit, the jacking equipment uses its jacking force to overcome friction between the pipe and the surrounding soil, burying the pipe between the two pits. Currently, municipal sewage pipe jacking often uses 1350mm diameter reinforced concrete pipes, with grouting reinforcement between the pipe and the entrance / exit of the working pit.

[0003] For example, a grouting device for pipe jacking construction, as disclosed in announcement number CN219509645U, includes an installation pipe and an inner lining pipe fitted onto the installation pipe. An elastic corrugated air cushion is provided between the installation pipe and the inner lining pipe. The inner surface of the elastic corrugated air cushion is fixedly fitted onto the outer wall of the installation pipe, and the outer surface of the elastic corrugated air cushion is fixedly embedded into the inner wall of the inner lining pipe. The inner lining pipe is composed of several inner lining arc plates, and each inner lining arc plate has an installation cavity on its outer wall. A grouting pipe is fixedly embedded in each installation cavity. A grout discharge hole is provided on the wall of the grouting pipe. Compared with the traditional one-time grouting method, this grouting device for pipe jacking construction avoids the problem of slow solidification speed and numerous voids in the mud due to excessive grouting in the gap between the pipe jacking and the working well at the tunnel entrance.

[0004] In traditional pipe jacking construction, the grouting pipes are arranged in a ring shape during the grouting process. The end far from the grouting inlet may not be able to discharge grout due to insufficient pressure. Furthermore, since the grouting outlets are evenly distributed, there may be excess grout at the outlet and voids may occur far from the outlet. The uneven distribution of grout around the pipe can also affect the lubrication and subsequent reinforcement of the pipe, resulting in poor performance.

[0005] Therefore, we propose a grouting device for pipe jacking construction to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide a grouting device for pipe jacking construction, so as to solve the problems mentioned in the background art, such as uneven distribution of grout on the outer periphery of the pipe, which can easily affect the lubrication and subsequent reinforcement of the pipe, resulting in poor performance.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a grouting device for pipe jacking construction, comprising a pipe jacking body, wherein a grouting mechanism is provided inside the pipe jacking body, the grouting mechanism comprising a grouting ring disposed inside the pipe jacking body, one end of the grouting ring being connected to a first grouting pipe, and one end of the grouting ring being connected to the first grouting pipe through a second grouting pipe, wherein a guide pipe is also connected to the outer periphery of the grouting ring, wherein a spiral groove is formed on the inner wall of the guide pipe, and a rotating ring is slidably mounted on the inner wall of the grouting ring, wherein a plurality of equally spaced arc-shaped fins are fixedly mounted on the outer periphery of the rotating ring;

[0008] The grouting mechanism is equipped with a guiding mechanism inside. The guiding mechanism includes an inner tube that is slidably installed inside the guide tube. A bent tube is connected to the upper end of the inner tube. A nozzle is installed at one end of the bent tube. A hemisphere is provided at the lower end of the inner tube. Both the lower end of the inner tube and the lower end of the hemisphere are provided with feed holes.

[0009] Preferably, a slider is fixedly installed on the outer periphery of the inner tube, and the slider is slidably installed in the spiral groove.

[0010] Preferably, the jacking pipe body is provided with a grouting mechanism inside, and the grouting mechanism further includes a grouting ring body. The grouting ring body is disposed between the grouting ring body and the jacking pipe body. The grouting ring body is provided with a clearance hole, and the clearance hole is inserted and connected to the guide pipe.

[0011] Preferably, the outer periphery of the grouting ring is also connected to a grouting pipe, and multiple sets of grouting pipes are provided. The multiple sets of grouting pipes are equidistantly arranged on the outer periphery of the grouting ring. The grouting ring and the injection ring are connected by a common connecting pipe, and a rotating ball is provided inside the grouting pipe.

[0012] Preferably, the nozzle is rotatably connected to the bent pipe, the nozzle has a groove, the groove wall has a discharge hole, the bent pipe has a collection hole, and the collection hole is located near the top pipe body of the bent pipe.

[0013] Preferably, a protrusion is provided on the inner wall of the inner tube, and a one-way ball is provided at the upper end of the protrusion, and the one-way ball is provided at the lower end of the collection hole.

[0014] Preferably, a material leveling mechanism is provided outside the guiding mechanism. The material leveling mechanism includes a corrugated pipe. The inner wall of the upper end of the corrugated pipe is fixedly connected to the inner pipe. The lower end of the corrugated pipe abuts against the top pipe body. The upper end of the corrugated pipe is connected to the collection hole. Side holes are provided on both sides of the corrugated pipe.

[0015] Preferably, a reciprocating mechanism is further provided outside the guiding mechanism. The reciprocating mechanism includes a fixed ring body fixedly installed on the outer periphery of the inner tube. A first elastic element is installed between the fixed ring body and the top wall of the grouting ring body. The first elastic element is disposed on the outer periphery of the inner tube.

[0016] Preferably, the outer periphery of the grouting mechanism is provided with a protective mechanism, which includes snap-fit ​​blocks fixedly installed on both sides of the upper end of the guide tube, and an arc-shaped baffle at the upper end of one of the snap-fit ​​blocks.

[0017] Preferably, the arc-shaped baffle is also located at the upper end of the bent pipe, and a second elastic element is installed between the arc-shaped baffle and the nozzle. A scraper is fixedly installed at the upper end of another snap-fit ​​block.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. During the injection process, the grout will come into contact with the arc-shaped fins, causing the arc-shaped fins and the rotating ring to rotate inside the grouting ring. This guides the grout inside the grouting ring, ensuring that the grout is evenly distributed in all areas of the grouting ring. This facilitates the uniform flow of the grout from the guide pipe, reducing the occurrence of voids due to uneven grout injection. During the advancement of the jacking pipe body, the grout can flow out from the nozzle and flow to the path of the jacking pipe body at the rear end, allowing for concentrated grout injection. This improves the utilization rate and filling rate of the grout and helps overcome the friction between the jacking pipe body and the surrounding soil.

[0020] 2. As the jacking pipe body advances and grout is injected, the rotating ring rotates within the grouting ring, while the hemisphere and inner pipe components reciprocate up and down within the grouting ring. Therefore, the grout sprayed from the nozzles exhibits a wave-like distribution. With the self-leveling of the grout, it ensures that the grout can be completely injected into the filling layer between the jacking pipe body and the soil, further reducing the occurrence of voids. During the up-and-down movement, the inner pipe components, bent pipe components, and nozzles also rotate left and right, greatly increasing the spray range of the nozzles and facilitating the filling of gaps between adjacent nozzles. This further increases the uniformity of grout injection, resulting in excellent performance.

[0021] 3. Excess grout flows along the bent pipe fittings into the collection hole and then into the bellows. The bellows has a hollow interior. As the inner pipe fittings move up and down, they expand and contract, drawing excess grout into the interior through the collection hole and spraying it out from the side holes. The side holes are located on both sides of the bellows and at the front end of the nozzles. The spraying range is located at the front end of the nozzles, spraying a thin layer of grout onto the outer periphery of the jacking pipe body in advance to form the first grout layer. This allows for advance control of the grouting space. The second layer of grout sprayed by the subsequent nozzles is located outside the first layer. This device uses a multi-layer layout for grouting, which not only reduces the voids in the grouting layer but also allows for the reuse of excess grout, resulting in high utilization and reduced grout waste.

[0022] 4. When the inner tube moves upward along the outer periphery of the arc-shaped fin, the fixed ring squeezes the first elastic element and moves upward synchronously. When the inner tube falls off the arc-shaped fin, the fixed ring and the first elastic element lose pressure. The reaction force of the first elastic element also drives the fixed ring and the inner tube to reset, providing a certain driving force for the inner tube to move downward, ensuring that the inner tube can always reciprocate during the grouting process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0024] Figure 2 This is an overall sectional view of the present invention;

[0025] Figure 3 This is a schematic diagram of the grouting mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram of the rotating ring structure of the present invention;

[0027] Figure 5 For the present invention Figure 2 Enlarged view of point A in the middle;

[0028] Figure 6 This is a schematic diagram of the guiding mechanism structure of the present invention;

[0029] Figure 7 This is a cross-sectional view of the grouting mechanism of the present invention;

[0030] Figure 8 This is a schematic diagram of the grouting mechanism of the present invention;

[0031] Figure 9 This is a schematic diagram of the protective mechanism structure of the present invention.

[0032] In the diagram: 1. Pipe jacking body; 2. Grouting mechanism; 21. Grouting ring; 22. First grouting pipe; 23. Second grouting pipe; 24. Guide pipe; 25. Spiral groove; 26. Rotating ring; 27. Arc-shaped fin; 3. Grouting replenishment mechanism; 31. Grouting replenishment ring; 32. Clearance hole; 33. Grouting replenishment pipe; 34. Connecting pipe; 35. Rotating sphere; 4. Guide mechanism; 41. Inner pipe fitting; 411. Protrusion; 41 2. One-way sphere; 42. Bending pipe fitting; 43. Nozzle; 44. Groove; 45. Discharge hole; 46. Hemisphere; 47. Feed hole; 48. Collection hole; 49. Slider; 5. Protective mechanism; 51. Clamping block; 52. Arc-shaped baffle; 53. Second elastic element; 54. Scraper; 6. Material leveling mechanism; 61. Corrugated pipe; 62. Side hole; 7. Reciprocating mechanism; 71. Fixed ring; 72. First elastic element. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: Please refer to Figures 1-7 A grouting device for pipe jacking construction includes a pipe body 1. A grouting mechanism 2 is installed inside the pipe body 1. The grouting mechanism 2 includes a grouting ring 21 installed inside the pipe body 1. One end of the grouting ring 21 is connected to a first grouting pipe 22, and the other end of the grouting ring 21 is connected to the first grouting pipe 22 via a second grouting pipe 23. Lubricating grout is injected into the grouting ring 21 through the first grouting pipe 22 and the second grouting pipe 23, ensuring the uniformity of the grout within the grouting ring 21. A guide pipe 24 is also connected to the outer periphery of the grouting ring 21. The guide pipe 24 is interlocked with the side wall of the pipe body 1, allowing grout to be injected into the pipe body 1 from the guide pipe 24. On the outer periphery of body 1, a rotating ring 26 is slidably installed on the inner wall of the grouting ring 21. Multiple equally spaced arc-shaped fins 27 are fixedly installed on the outer periphery of the rotating ring 26. The grouting ring 21 is provided with two grout injection ports, both of which are connected to the arc-shaped fins 27. Therefore, during the injection process, the grout will come into contact with the arc-shaped fins 27 and drive the arc-shaped fins 27 and the rotating ring 26 to rotate inside the grouting ring 21, guiding the grout inside the grouting ring 21 so that the grout is evenly distributed in all areas inside the grouting ring 21. This facilitates the uniform flow of grout from the guide pipe 24 and reduces the occurrence of voids due to uneven grout injection.

[0035] The grouting mechanism 2 is internally equipped with a guide mechanism 4, which includes an inner tube 41 slidably installed inside the guide tube 24. The upper end of the inner tube 41 is connected to a bent tube 42, and a nozzle 43 is installed at one end of the bent tube 42. The lower end of the inner tube 41 is provided with a hemisphere 46. Both the lower end of the inner tube 41 and the lower end of the hemisphere 46 are provided with feed holes 47, which are also connected to the grouting ring 21. The grout entering the grouting ring 21 can flow into the inner tube 41 through the feed holes 47. The bending direction of the bent tube 42 is opposite to the forward direction of the jacking pipe body 1, which ensures that the grout can flow out from the nozzle 43 and flow to the path of the jacking pipe body 1 at the rear end during the advancement process, so as to concentrate the injection of grout, improve the utilization rate and filling rate of grout, and facilitate the overcoming of the friction between the jacking pipe body 1 and the surrounding soil.

[0036] The lower end of the inner pipe fitting 41 is provided with a hemisphere 46, which is located on the arc-shaped fin 27. During the rotation of the rotating ring 26 and the arc-shaped fin 27, the hemisphere 46 and the inner pipe fitting 41 rise along the arc of the arc-shaped fin 27. When they slide to the highest point of the arc-shaped fin 27, the diameter of the slurry injected by the multiple nozzles 43 is at its maximum, which makes it easy to ensure that the outermost end of the jacking pipe body 1 in contact with the soil can be completely filled. After it falls off the arc-shaped fin 27, the diameter of the slurry injected by the multiple nozzles 43 is at its minimum, which makes it easy to ensure that the innermost end of the jacking pipe body 1 in contact with the soil can be completely filled, and the filling is relatively uniform.

[0037] As the jacking body 1 advances and grout is injected, the rotating ring 26 rotates in the grouting ring 21, and the hemisphere 46 and inner pipe 41 reciprocate up and down in the grouting ring 21. Therefore, the grout sprayed by the nozzle 43 is distributed in a wave shape. With the self-leveling of the grout, it can be ensured that the grout can be completely injected into the filling layer between the jacking body 1 and the soil, further reducing the occurrence of voids.

[0038] Example 2: Please refer to Figures 2-7 A spiral groove 25 is provided on the inner wall of the guide tube 24. A slider 49 is fixedly installed on the outer periphery of the inner tube 41. The slider 49 is slidably installed in the spiral groove 25. The position of the guide tube 24 remains unchanged. When the inner tube 41 moves upward in the guide tube 24, the slider 49 moves in the spiral groove 25. The inner tube 41 rotates to adapt to the curvature of the spiral groove 25. When the inner tube 41 moves downward in the guide tube 24, the inner tube 41 rotates in the opposite direction. Therefore, the inner tube 41, the bent tube 42, and the nozzle 43 will also rotate left and right during the up and down movement. The spray range of the nozzle 43 is greatly increased, which makes it easier to fill the gaps between adjacent nozzles 43, further increasing the uniformity of slurry injection and improving the performance.

[0039] Example 3: Please refer to Figures 2-7The nozzle 43 is rotatably connected to the bent pipe fitting 42. The nozzle 43 has a groove 44, and the groove wall of the groove 44 has a discharge hole 45. The nozzle 43 swings left and right with the bent pipe fitting 42, and the slurry is sprayed out from the discharge hole 45 to fill the outer circumference of the jacking pipe body 1. The bent pipe fitting 42 has a collection hole 48, which is located near the jacking pipe body 1. During the movement of the nozzle 43, the slurry in the overlapping part of the movement trajectory of the nozzle 43 will flow back to the collection hole 48 in the nozzle 43 for collection due to excess.

[0040] A material leveling mechanism 6 is provided outside the guiding mechanism 4. The material leveling mechanism 6 includes a corrugated pipe 61. The inner wall of the upper end of the corrugated pipe 61 is fixedly connected to the inner pipe fitting 41. The lower end of the corrugated pipe 61 abuts against the top pipe body 1. The upper end of the corrugated pipe 61 is connected to the collection hole 48. Side holes 62 are opened on both sides of the corrugated pipe 61. Excess slurry flows into the collection hole 48 along the bent pipe fitting 42 and into the corrugated pipe 61. The corrugated pipe 61 is a cavity. It expands and contracts as the inner pipe fitting 41 moves up and down. During the expansion and contraction process, excess slurry is drawn into the collection hole 48. The grout enters the interior and is ejected from the side holes 62, which are located on both sides of the bellows 61 and at the front end of the nozzle 43. The spraying range is located at the front end of the nozzle 43, which sprays a thin layer of grout onto the outer periphery of the jacking pipe body 1 in advance to form the first grout layer. This allows for advance control of the grouting space. The second layer of grout sprayed by the nozzle 43 is located at the outer end of the first layer of grout. This device adopts a multi-layer layout for grouting, which not only reduces the voids in the grouting layer, but also allows for the reuse of excess grout, resulting in a high utilization rate and reducing grout waste.

[0041] Example 4: Please refer to Figures 5-7 and Figure 9 The inner wall of the inner pipe 41 is provided with a protrusion 411. The protrusion 411 has a ring structure and a hole in the middle. The upper end of the protrusion 411 is fixedly connected to a one-way ball 412 by a spring. When the one-way ball 412 blocks the outward flow of the slurry, its pressure is directed outward to the one-way ball 412. The one-way ball 412 stretches the spring, and the hole in the middle of the protrusion 411 is open, so the liquid can flow. When the slurry no longer flows outward, the one-way ball 412 resets and blocks the hole of the protrusion 411, so that the inner pipe 41 forms a one-way flow state, preventing the slurry from completely entering the inner pipe 41. The one-way ball 412 is located at the lower end of the collection hole 48 and does not affect the collection function of the collection hole 48.

[0042] The guide mechanism 4 is also provided with a reciprocating mechanism 7. The reciprocating mechanism 7 includes a fixed ring 71 fixedly installed on the outer periphery of the inner pipe 41. A first elastic element 72 is installed between the fixed ring 71 and the top wall of the grouting ring 21. The first elastic element 72 is located on the outer periphery of the inner pipe 41.

[0043] When the inner tube 41 moves upward along the outer periphery of the arc-shaped fin 27, the fixed ring 71 squeezes the first elastic element 72 and moves upward synchronously. When the inner tube 41 falls off the arc-shaped fin 27, the fixed ring 71 and the first elastic element 72 lose pressure. The reaction force of the first elastic element 72 also drives the fixed ring 71 and the inner tube 41 to reset, providing a certain driving force for the inner tube 41 to move downward, ensuring that the inner tube 41 can always reciprocate during the grouting process.

[0044] Example 4: Please refer to Figures 5-9 The grouting mechanism 2 is provided with a protective mechanism 5 on its outer periphery. The protective mechanism 5 includes a snap-fit ​​block 51 fixedly installed on both sides of the upper end of the guide pipe 24. By setting the snap-fit ​​block 51, the connection between the grouting mechanism 2 and the jacking pipe body 1 is ensured. One of the snap-fit ​​blocks 51 has an arc-shaped baffle 52 at the upper end. The arc-shaped baffle 52 is also located at the upper end of the bent pipe fitting 42, which can support the soil and provide space for the inner pipe fitting 41 and the bent pipe fitting 42 to move. The snap-fit ​​block 51 and the arc-shaped baffle 52 can also break the soil and provide space for the nozzle 43 to spray mud, protect the nozzle 43 and reduce the possibility of the soil clogging the nozzle 43.

[0045] A second elastic element 53 is installed between the arc-shaped baffle 52 and the nozzle 43. Under the action of the second elastic element 53, the arc-shaped baffle 52 has a certain elasticity and support force. When hard soil or rocks appear at the front end of the jacking pipe body 1, the arc-shaped baffle 52 has a high protective effect on the nozzle 43.

[0046] Another clip block 51 has a scraper 54 fixedly installed on its upper end. The mud sprayed from the nozzle 43 is sprayed onto the scraper 54. As the jacking pipe body 1 is pushed, the scraper 54 remains stationary. The mud is sprayed out in a wave shape by the moving nozzle 43. The scraper 54 can then scrape the bottom of the mud flat, ensuring that the mud thickness is uniform and reducing the occurrence of voids.

[0047] The jacking pipe body 1 is also equipped with a grouting mechanism 3. The grouting mechanism 3 also includes a grouting ring 31, which is located between the grouting ring 21 and the jacking pipe body 1. The grouting ring 31 is a ring-shaped flexible airbag structure used to fill the gap between the outer periphery of the grouting ring 21 and the inner wall of the jacking pipe body 1, ensuring the stability of the grouting ring 21. The grouting ring 31 is provided with a clearance hole 32, which is inserted and connected to the guide pipe 24 for the placement of the guide pipe 24.

[0048] The outer periphery of the grouting ring 31 is also connected to a grouting pipe 33. Multiple sets of grouting pipes 33 are equidistantly arranged around the outer periphery of the grouting ring 31. A rotating ball 35 is installed inside each grouting pipe 33, rotatably positioned outside the grouting pipe 33. A gap is provided between the rotating ball 35 and the grouting pipe 33. Two grouting pipes 33 are located on either side of the nozzle 43 to absorb excess grout around the nozzle 43. The grouting ring 31... A connecting pipe 34 is connected between the grouting ring 21 and the grouting ring 21. The grout inside the grouting ring 21 can be injected into the grouting ring 31 through the connecting pipe 34. The grouting ring 31 has an air bladder structure and can expand adaptively according to the amount of grout injected. When there is excess grout in the grouting space, the grout will flow into the grouting pipe 33 through the gap between the rotating balls 35. Conversely, when there is a void in the grout, the grout will be injected into the void through the gap between the rotating balls 35 for adaptive grouting.

[0049] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A grouting device for pipe jacking construction, comprising a pipe jacking body (1), the inside of the pipe jacking body (1) is provided with a grouting mechanism (2), characterized in that: The grouting mechanism (2) includes a grouting ring body (21) arranged inside the pipe body (1), one end of the grouting ring body (21) is communicated with a first grouting pipe (22), one end of the grouting ring body (21) is communicated with the first grouting pipe (22) through a second grouting pipe (23), the outer periphery of the grouting ring body (21) is further communicated with a guide pipe (24), a spiral groove (25) is arranged on the inner wall of the guide pipe (24), a rotating ring body (26) is slidingly installed on the inner wall of the grouting ring body (21), a plurality of equidistantly distributed arc-shaped fins (27) are fixedly installed on the outer periphery of the rotating ring body (26). The grouting mechanism (2) is internally provided with a guide mechanism (4), the guide mechanism (4) includes an inner pipe fitting (41) slidingly installed inside the guide pipe (24), the upper end of the inner pipe fitting (41) is communicated with a bent pipe fitting (42), one end of the bent pipe fitting (42) is provided with a spray head (43), the lower end of the inner pipe fitting (41) is provided with a hemispherical body (46), the lower end of the inner pipe fitting (41) and the lower end of the hemispherical body (46) are both provided with feeding holes (47). The pipe body (1) is internally provided with a grout supplementing mechanism (3), the grout supplementing mechanism (3) further includes a grout supplementing ring body (31), the grout supplementing ring body (31) is arranged between the grouting ring body (21) and the pipe body (1), the grout supplementing ring body (31) is provided with an avoiding hole (32), the avoiding hole (32) is connected with the guide pipe (24) in a penetrating manner. The spray head (43) is rotationally connected with the bent pipe fitting (42), the spray head (43) is provided with a groove (44), the groove wall of the groove (44) is provided with a discharging hole (45), the bent pipe fitting (42) is provided with a collecting hole (48), the collecting hole (48) is arranged at the position of the bent pipe fitting (42) close to the pipe body (1). The guide mechanism (4) is externally provided with a material uniformizing mechanism (6), the material uniformizing mechanism (6) includes a bellows (61), the inner wall of the upper end of the bellows (61) is fixedly connected with the inner pipe fitting (41), the lower end of the bellows (61) abuts against the pipe body (1), the upper end of the bellows (61) is communicated with the collecting hole (48), the two sides of the bellows (61) are provided with side holes (62).

2. The grouting device for pipe jacking construction according to claim 1, characterized in that: The outer periphery of the inner pipe fitting (41) is fixedly installed with a sliding block (49), the sliding block (49) is slidingly installed in the spiral groove (25).

3. The grouting device for pipe jacking construction according to claim 1, characterized in that: The outer periphery of the grout supplementing ring body (31) is further communicated with a grout supplementing pipeline (33), the grout supplementing pipeline (33) is provided with a plurality of groups, the plurality of groups of the grout supplementing pipeline (33) are equidistantly arranged on the outer periphery of the grout supplementing ring body (31), the grout supplementing ring body (31) and the grouting ring body (21) are jointly communicated with a communication pipeline (34), the inside of the grout supplementing pipeline (33) is provided with a rotating ball (35).

4. The grouting device for pipe jacking construction according to claim 1, characterized in that: The inner wall of the inner pipe (41) is provided with a protrusion (411), the upper end of the protrusion (411) is provided with a one-way ball (412), and the one-way ball (412) is arranged at the lower end of the collection hole (48).

5. The grouting device for pipe jacking construction according to claim 1, characterized in that: The outer part of the guide mechanism (4) is further provided with a reciprocating mechanism (7), the reciprocating mechanism (7) comprises a fixed ring (71) fixedly installed on the outer periphery of the inner pipe (41), a first elastic member (72) is jointly installed between the fixed ring (71) and the top wall of the grouting ring (21), and the first elastic member (72) is arranged on the outer periphery of the inner pipe (41).

6. The grouting device for pipe jacking construction of claim 1, characterized in that: The outer periphery of the grouting mechanism (2) is provided with a protection mechanism (5), the protection mechanism (5) comprises clamping blocks (51) fixedly installed on both sides of the upper end of the guide pipe (24), and the upper end of one of the clamping blocks (51) is provided with an arc-shaped baffle (52).

7. The grouting device for pipe jacking construction according to claim 6, characterized in that: The arc-shaped baffle (52) is also located at the upper end of the bent pipe (42), a second elastic member (53) is jointly installed between the arc-shaped baffle (52) and the nozzle (43), and the upper end of the other clamping block (51) is fixedly installed with a scraper (54).

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