A rectangular pipe jacking grouting drag-reducing pipe section device and its construction method

Abstract

This invention relates to the field of rectangular pipe jacking technology, and discloses a rectangular pipe jacking grouting drag-reducing pipe section device and its construction method. It includes a rectangular pipe section body and a jacking mechanism. The rectangular pipe section body has parallel, spaced-apart socket-side structures and spigot-side structures, forming an annular placement space on the outer side of the rectangular pipe section body. At least two jacking mechanisms are spaced apart at the top of the annular placement space. Each jacking mechanism includes a retaining plate and a jacking actuator. The jacking actuator is connected between the rectangular pipe section body and the retaining plate, and the jacking direction of the jacking actuator is set outward from the center of the rectangular pipe section body. The retaining plate has a first grouting hole corresponding to the spigot side, and multiple second grouting holes are also provided in the annular placement space, distributed between adjacent retaining plates. Both the first and second grouting holes are connected to a grouting pipeline. The jacking mechanism can prevent loose soil from falling and collapsing, ensuring that the pressurized grout can uniformly fill and support the reconstructed shield tail gap.

Description

Technical Field

[0001] This invention relates to the field of rectangular pipe jacking technology, and in particular to a rectangular pipe jacking grouting drag-reducing pipe section device and its construction method. Background Technology

[0002] Currently, rectangular pipe jacking is a key technology for urban underground space development, which can avoid traffic disruption and reduce the environmental impact of construction. In long-distance, large-face jacking projects, the friction between the pipe section and the overlying soil generates a backsoil effect, which can easily cause severe surface disturbance and affect surrounding buildings and pipelines.

[0003] Chinese invention patent application CN104265326A, published on January 7, 2015, discloses a method for controlling soil deformation during large rectangular pipe jacking. This device mainly consists of a friction-reducing grouting system and a soil compensation system. Grouting ports and mud-pressing ports are respectively opened on the segments of the rectangular pipe jacking. The grouting ports are located on the segments, while the mud-pressing ports are located at the top and bottom of the segments. The friction-reducing grouting system consists of a surface water supply system, a surface mixing system, an underground grout injection pipeline system, and an electric ball valve PLC control system. The soil compensation system includes mud-pressing equipment and mud-pressing pipelines. The first end of the mud-pressing pipeline is connected to the mud-pressing equipment, and the second end is connected to the mud-pressing port. Mud is pressed between the outside of the mud sleeve outside the pipe segment and the soil through the mud-pressing pipeline to raise the soil and compensate for soil settlement.

[0004] Existing methods for controlling soil deformation during large rectangular pipe jacking excavation use friction-reducing slurry to reduce the frictional resistance of the pipe segment wall, while the mud sleeve formed by the slurry itself blocks the direct contact between the pipe segment wall and the soil, preventing soil backing during excavation.

[0005] However, in rectangular pipe jacking construction, the loose soil around the tunnel boring machine is not yet stable after excavation, and it is easy to collapse and fill the reserved over-excavation gap, which makes grouting difficult, the grout distribution is uneven, and the back soil effect is serious, making it difficult to apply under construction conditions of long distance, large end face and great depth. Summary of the Invention

[0006] The technical problem to be solved by this invention is that in the construction of rectangular pipe jacking, the loose soil around the tunnel boring machine is not yet stable after excavation, and it is easy to collapse and fill the reserved over-excavation gap, which makes grouting difficult, the grout distribution is uneven, and the back soil effect is serious, making it difficult to apply under construction conditions of long distance, large end face and great depth.

[0007] To address the aforementioned technical problems, this invention provides a rectangular jacking pipe grouting drag-reducing pipe section device and its construction method.

[0008] The rectangular pipe jacking grouting drag reduction pipe section device includes a rectangular pipe section body and a jacking mechanism. The rectangular pipe section body is provided with a socket side structure and a spigot side structure. The socket side structure and the spigot side structure are arranged in parallel and spaced apart, and an annular placement space is formed on the outer side of the rectangular pipe section body.

[0009] At least two of the top pressing mechanisms are spaced apart at the top of the annular space. Each top pressing mechanism includes a retaining plate and a top pressing driver. The top pressing driver is connected between the rectangular pipe section body and the retaining plate. The retaining plate is clearance-fitted with the socket side structure and the spigot side structure, respectively. The pressing direction of the top pressing driver is set outward from the center of the rectangular pipe section body.

[0010] The retaining plate is provided with a first grouting hole on the corresponding insertion side, and the annular space is also provided with a plurality of second grouting holes. The second grouting holes are distributed between two adjacent retaining plates. Both the first grouting hole and the second grouting hole are used to connect with the grouting pipeline.

[0011] Furthermore, the annular space is provided with the pressing mechanism on its side, or the annular space is provided with the pressing mechanism on both its side and bottom.

[0012] Furthermore, the rectangular pipe section body also includes a flange structure, the socket side structure is fixedly connected to one side of the flange structure, the spigot side structure is fixedly connected to the other side of the flange structure, and both the socket side structure and the spigot side structure protrude from the outer contour of the flange structure.

[0013] Furthermore, the socket side structure is a socket side steel ring, the spigot side structure is a spigot side steel ring, the outer wall of the spigot side steel ring is also provided with a sealing ring, and the inner wall of the socket side steel ring and the inner wall of the spigot side steel ring are respectively provided with reinforcing ribs.

[0014] Furthermore, the top pressure actuator is a hydraulic jack, which includes a cylinder and a top rod. The top rod is slidably installed in the cylinder, and the cylinder is fixedly installed on the flange structure. One end of the top rod is connected to the retaining plate.

[0015] Furthermore, the top rod is bidirectionally inserted through the cylinder body, and a hollow channel is provided in the middle of the top rod. The interior of the retaining plate is provided with a hollow cavity, which is connected to the hollow channel and the first grouting hole respectively.

[0016] Furthermore, the retaining plate is provided with a socket side slope and a spigot side slope on the side facing away from the top pressure driver. The socket side slope is arranged to be inclined outward in the opposite direction of the jacking, and the spigot side slope is arranged to be inclined outward in the jacking direction. The first grouting hole is distributed on the spigot side slope.

[0017] Furthermore, the annular space has a straight-edge space portion and a curved-angle space portion, and the retaining plate includes a strip retaining plate and a curved retaining plate. The strip retaining plate is clearance-fitted with the straight-edge space portion, and the curved retaining plate is clearance-fitted with the curved-angle space portion.

[0018] Furthermore, the second grouting hole is opened on the flange structure, and a guide plate is provided on the outside of the second grouting hole, the guide plate being flared outward.

[0019] The construction method for the rectangular pipe jacking grouting drag reduction pipe section device described above includes the following steps:

[0020] S1. Install grouting drag reduction pipe section devices on the rear side of the rectangular pipe jacking machine and in the middle of the tunnel. First, connect the pipe section to the socket of the previous pipe section through the socket side structure and push it into the tunnel. Then, connect the pipe section to the next pipe section through the socket side structure.

[0021] S2. Start the jacking mechanism according to the drag reduction requirements, control the jacking mechanism to push the retaining plate outward and squeeze the surrounding soil until the retaining plate reaches the predetermined position.

[0022] S3. Inject pressurized grout into the tail shield gap through the grouting pipeline and the first grouting hole, and replenish pressurized grout through the grouting pipeline and the second grouting hole.

[0023] S4. After the jacking is completed, remove the jacking driver, leaving the socket side structure and spigot side structure in the tunnel, and seal the first grouting hole and the second grouting hole.

[0024] Compared with existing technologies, the rectangular pipe jacking grouting drag-reducing pipe section device and its construction method of the present invention have the following advantages: The rectangular pipe jacking grouting drag-reducing pipe section device adopts a design of a rectangular pipe section body and a jacking mechanism. The rectangular pipe section body has a socket side structure and a spigot side structure arranged in parallel at intervals. The socket side structure is connected to the spigot of the previous pipe section. After the entire device is jacked into the tunnel, it can be connected to the subsequent pipe sections through the spigot side structure. Moreover, an annular placement space is formed on the outer side of the rectangular pipe section body between the socket side structure and the spigot side structure. At least two jacking mechanisms are arranged at intervals on the top of the annular placement space. Activating the jacking mechanism can squeeze the loose soil in the upper part of the tunnel, preventing the loose soil after excavation from falling and collapsing.

[0025] The jacking mechanism includes a retaining plate and a jacking actuator. The jacking actuator is connected between the rectangular tube section body and the retaining plate. The jacking direction of the jacking actuator is set outward from the center of the rectangular tube section body. When the jacking mechanism is closed, the retaining plate is inside the annular space, preventing the rectangular tube section body from being hindered from jacking smoothly in the tunnel due to the retaining plate protruding outward. When the grouting drag-reducing tube section device reaches the predetermined position in the tunnel, the jacking actuator is activated to drive the retaining plate to jacke outward from the annular space, which can gradually squeeze the loose soil in the upper part of the tunnel to a stable state until the retaining plate extends to the predetermined position and forms a stable over-excavation gap.

[0026] Because the retaining plate has a first grouting hole on the corresponding spigot side, and multiple second grouting holes are also provided in the annular space, both the first and second grouting holes are used to connect with the grouting pipeline. Pressure grout is injected into the shield tail gap through the grouting pipeline and the first grouting hole, and pressure grout is replenished into the shield tail gap through the grouting pipeline and the second grouting hole. The pressure grout can evenly fill and support the reconstructed shield tail gap, avoiding severe back-soil effect due to uneven grout distribution and reducing the frictional force generated by the pipe-soil contact. In addition, the pressure grout discharged from the first grouting hole can generate a reaction force on the rectangular pipe section body in the jacking direction, making it suitable for applications under long-distance, large-end-face, and large-depth construction conditions. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of the rectangular jacking pipe grouting drag reduction pipe section device in an embodiment of the present invention;

[0028] Figure 2 This is a front view schematic diagram of the rectangular jacking pipe grouting drag reduction pipe section device in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the top pressure driver in an embodiment of the present invention;

[0030] Figure 4 This is a three-dimensional schematic diagram of the retaining plate in an embodiment of the present invention;

[0031] Figure 5 This is a cross-sectional schematic diagram of the retaining plate in an embodiment of the present invention;

[0032] Figure 6 This is a partial cross-sectional view of the rectangular jacking pipe grouting drag reduction pipe section device in the embodiment of the present invention during tunnel jacking operation;

[0033] In the figure, 1-rectangular pipe section body, 10-annular placement space, 100-second grouting hole, 101-guide plate, 11-socket side structure, 12-spigot side structure, 13-flange structure, 14-sealing ring, 15-reinforcing rib, 2-top pressure mechanism, 21-soil retaining plate, 210-first grouting hole, 211-strip retaining plate, 212-bent retaining plate, 213-hollow cavity, 214-socket side inclined surface, 215-spigot side inclined surface, 22-top pressure actuator, 221-cylinder body, 222-top rod, 223-hollow channel, 23-hydraulic circulation passage, 24-oil pump, 3-grouting pipeline, 41-shield tail gap filling layer, 42-loose layer, 43-soil arch reconstruction zone, 44-compacting layer, 45-shield tail grouting zone. Detailed Implementation

[0034] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" used to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] like Figures 1 to 6As shown, the rectangular jacking pipe grouting drag reduction pipe section device of the present invention includes a rectangular pipe section body 1 and a jacking mechanism 2. The rectangular pipe section body 1 is provided with a socket side structure 11 and a spigot side structure 12. The socket side structure 11 and the spigot side structure 12 are arranged in parallel and spaced apart, and an annular placement space 10 is formed on the outside of the rectangular pipe section body 1. At least two jacking mechanisms 2 are arranged at intervals on the top of the annular placement space 10.

[0039] The jacking mechanism 2 includes a retaining plate 21 and a jacking actuator 22. The jacking actuator 22 is connected between the rectangular pipe section body 1 and the retaining plate 21. The retaining plate 21 is clearance-fitted with the socket side structure 11 and the spigot side structure 12 respectively. The jacking direction of the jacking actuator 22 is set outward from the center of the rectangular pipe section body 1. The retaining plate 21 is provided with a first grouting hole 210 corresponding to the spigot side. A plurality of second grouting holes 100 are also provided in the annular space 10. The second grouting holes 100 are distributed between two adjacent retaining plates 21. The first grouting hole 210 and the second grouting hole 100 are both used to communicate with the grouting pipeline 3.

[0040] The rectangular pipe jacking grouting drag reduction pipe section device adopts a design of rectangular pipe section body 1 and jacking mechanism 2. The rectangular pipe section body 1 is provided with a socket side structure 11 and a spigot side structure 12 arranged in parallel at intervals. The socket side structure 11 is connected to the spigot of the previous pipe section. After the entire device is jacked into the tunnel, it can be connected to the subsequent pipe section through the spigot side structure 12. Moreover, an annular placement space 10 is formed on the outer side of the rectangular pipe section body 1 between the socket side structure 11 and the spigot side structure 12. At least two jacking mechanisms 2 are arranged at intervals on the top of the annular placement space 10. Activating the jacking mechanism 2 can squeeze the loose soil in the upper part of the tunnel to prevent the loose soil after excavation from falling and collapsing.

[0041] The jacking mechanism 2 includes a retaining plate 21 and a jacking actuator 22. The jacking actuator 22 is connected between the rectangular tube section body 1 and the retaining plate 21. The jacking direction of the jacking actuator 22 is set outward from the center of the rectangular tube section body 1. When the jacking mechanism 2 is closed, the retaining plate 21 is inside the annular space 10, preventing the rectangular tube section body 1 from being affected by the outward protrusion of the retaining plate 21 during smooth jacking in the tunnel. When the grouting drag-reducing tube section device reaches the predetermined position in the tunnel, the jacking actuator 22 is activated to drive the retaining plate 21 to jacke outward from the annular space 10, which can gradually squeeze the loose soil in the upper part of the tunnel to a stable state until the retaining plate 21 extends to the predetermined position and forms a stable over-excavation gap.

[0042] Because the retaining plate 21 has a first grouting hole 210 on the corresponding spigot side, and the annular space 10 also has multiple second grouting holes 100, both the first and second grouting holes 210 are used to connect with the grouting pipeline 3. Pressure grout is injected into the shield tail gap through the grouting pipeline 3 and the first grouting hole 210, and pressure grout is replenished into the shield tail gap through the grouting pipeline 3 and the second grouting hole 100. The pressure grout can evenly fill and support the reconstructed shield tail gap, avoiding severe back soil effect due to uneven grout distribution and reducing the frictional force generated by the pipe-soil contact. In addition, the pressure grout discharged from the first grouting hole 210 can generate a reaction force in the jacking direction on the rectangular pipe section body 1, making it suitable for applications under long-distance, large-end-face, and large-depth construction conditions.

[0043] In this embodiment, a top-pressing mechanism 2 is provided at intervals on the sides and bottom of the annular space 10, meaning that a top-pressing mechanism 2 is provided at all circumferential positions of the annular space 10. The retaining plates 21 on the top, bottom, and sides can uniformly compress the circumferential sidewalls of the tunnel, ensuring that the subsequently injected pressure grout can completely fill the shield tail gap in the circumferential position, thus improving the uniformity of pressure grout distribution. To meet different usage requirements, in other embodiments, the top-pressing mechanism at the bottom of the annular space can be omitted, and a top-pressing mechanism can be provided on the sides of the annular space. The retaining plates 21 on the top and sides of the rectangular tube section body 1 can compress the loose soil on the upper part and sides of the tunnel.

[0044] As a further preferred embodiment, the rectangular pipe section body 1 also includes a flange structure 13. A socket-side structure 11 is fixedly connected to one side of the flange structure 13, and a spigot-side structure 12 is fixedly connected to the other side of the flange structure 13. Both the socket-side structure 11 and the spigot-side structure 12 protrude from the outer contour of the flange structure 13. Specifically, the socket-side structure 11 is a socket-side steel ring, and the spigot-side structure 12 is a spigot-side steel ring. The outer wall of the spigot-side steel ring is also provided with a sealing ring 14, which prevents pressurized grout from seeping backward from the shield tail gap into the interior of the rectangular pipe section body 1. Furthermore, the inner walls of the socket-side steel ring and the spigot-side steel ring are respectively provided with reinforcing ribs 15. The reinforcing ribs 15 can improve the structural strength of the socket-side steel ring and the spigot-side steel ring, ensuring that sufficient compressive force can be generated on the inner wall soil of the tunnel.

[0045] Furthermore, the top pressure actuator 22 is a hydraulic jack, which includes a cylinder body 221 and a push rod 222. The push rod 222 is slidably installed in the cylinder body 221, and the cylinder body 221 is fixedly installed on the flange structure 13. One end of the push rod 222 is connected to the retaining plate 21, and the cylinder body 221 is connected to the oil pump 24 through the hydraulic circulation passage 23. The push rod 222 is bidirectionally installed through the cylinder body 221, and a hollow channel 223 is opened in the middle of the push rod 222. The retaining plate 21 has a hollow cavity 213 inside, which is connected to the first grouting hole 210 and the hollow channel 223 respectively. It should be noted that this hydraulic jack is a specially designed hydraulic jack, with the jack rod 222 running bidirectionally through the cylinder body 221. While ensuring the normal extension and retraction of the jack rod 222, it can ensure that the hollow channel 223 of the jack rod 222 can be effectively connected with the grouting pipe 3 and the hollow cavity 213.

[0046] The jacking stroke of the jacking mechanism 2 is any range between 5mm and 100mm, for example, between 5mm and 50mm. The retaining plate 21, facing away from the jacking actuator 22, has a socket side slope 214 and a spigot side slope 215. The socket side slope 214 is arranged inclined outwards in the opposite direction of jacking, and the spigot side slope 215 is arranged inclined outwards in the jacking direction. First grouting holes 210 are distributed on the spigot side slope 215. The socket side slope 214 reduces the friction between the retaining plate 21 and the tunnel wall during jacking. The first grouting holes 210 are located on the spigot side slope 215 to prevent soil from entering the first grouting holes 210 and blocking the smooth discharge of pressurized grout.

[0047] In addition, the annular space 10 has a straight-edge space and a curved space. The retaining plate 21 includes a strip retaining plate 211 and a curved retaining plate 212. The strip retaining plate 211 is clearance-fitted with the straight-edge space, and the curved retaining plate 212 is clearance-fitted with the curved space. The combination of the strip retaining plate 211 and the curved retaining plate 212 can form a high match with the annular space 10, ensuring that the retaining plate 21 can provide comprehensive compression support for the upper and lower parts, two sides, and four corners of the tunnel. The second grouting hole 100 is opened on the flange structure 13. A guide plate 101 is also provided on the outside of the second grouting hole 100. The guide plate 101 is flared outward.

[0048] The construction method based on the above-mentioned rectangular pipe jacking grouting drag reduction pipe section device includes the following steps:

[0049] S1. Install a grouting drag reduction pipe section device on the rear side of the rectangular pipe jacking machine and in the middle of the tunnel. First, connect it to the socket of the previous pipe section through the socket side structure 11. Under the action of the jacking iron and the starting side cylinder, it is pushed into the tunnel. Then, it is connected to the next pipe section through the socket side structure 12.

[0050] S2. Start the jacking mechanism 2 according to the drag reduction requirements, and control the retaining plate 21 of the jacking mechanism 2 to push outward and squeeze the surrounding soil until the retaining plate 21 reaches the predetermined position.

[0051] S3. Pressure grout is injected into the tail gap through grouting pipe 3 and the first grouting hole 210, and pressure grout is supplemented through grouting pipe 3 and the second grouting hole 100 to fill and support the reconstructed tail gap. Figure 6 As shown, the soil inside the tunnel wall that has not been grouted is a loose layer 42. Under the compression of the retaining plate 21, a shield tail gap filling layer 41 is generated. At the same time, pressurized grout is injected into the shield tail grouting area 45 through the grouting pipeline 3, the first grouting hole 210 and the second grouting hole 100, forming a compacted layer 44 between the tunnel wall and the shield tail grouting area 45. The tunnel wall corresponds to the shield tail grouting area 45 to form a soil arch reconstruction area 43.

[0052] S4. After the jacking is completed, remove the jacking driver 22, leaving the socket side structure 11 and the spigot side structure 12 in the tunnel, and seal the first grouting hole 210 and the second grouting hole 100.

[0053] The construction method of the rectangular jacking pipe grouting drag reduction pipe section device in this embodiment of the invention is the same as the construction method of the rectangular jacking pipe grouting drag reduction pipe section device in the specific embodiment of the above invention, and will not be repeated here.

[0054] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A rectangular pipe jacking grouting drag-reducing pipe section device, characterized in that, It includes a rectangular pipe section body (1) and a pressing mechanism (2). The rectangular pipe section body (1) is provided with a socket side structure (11) and a spigot side structure (12). The socket side structure (11) and the spigot side structure (12) are arranged in parallel and spaced apart. A ring-shaped placement space (10) is formed on the outside of the rectangular pipe section body (1). At least two of the top pressing mechanisms (2) are provided at intervals on the top of the annular space (10). The top pressing mechanism (2) includes a retaining plate (21) and a top pressing driver (22). The top pressing driver (22) is connected between the rectangular pipe section body (1) and the retaining plate (21). The retaining plate (21) is respectively fitted with the socket side structure (11) and the spigot side structure (12). The pressing direction of the top pressing driver (22) is set from the center of the rectangular pipe section body (1) outward. The retaining plate (21) is provided with a first grouting hole (210) on the corresponding insertion side. The annular placement space (10) is also provided with a plurality of second grouting holes (100). The second grouting holes (100) are distributed between two adjacent retaining plates (21). The first grouting hole (210) and the second grouting hole (100) are both used to communicate with the grouting pipeline (3). The rectangular pipe section body (1) also includes a flange structure (13), the socket side structure (11) is fixedly connected to one side of the flange structure (13), and the spigot side structure (12) is fixedly connected to the other side of the flange structure (13). Both the socket side structure (11) and the spigot side structure (12) protrude from the outer contour of the flange structure (13). The top pressure actuator (22) is a hydraulic jack. The top pressure actuator (22) includes a cylinder (221) and a push rod (222). The push rod (222) is sealed and slidably installed in the cylinder (221). The cylinder (221) is fixedly installed on the flange structure (13). One end of the push rod (222) is connected to the retaining plate (21). The top rod (222) is bidirectionally inserted through the cylinder body (221). A hollow channel (223) is provided in the middle of the top rod (222). A hollow cavity (213) is provided inside the retaining plate (21). The hollow cavity (213) is connected to the hollow channel (223) and the first grouting hole (210) respectively. The retaining plate (21) is provided with a socket side slope (214) and a spigot side slope (215) on the side opposite to the top pressure driver (22). The socket side slope (214) is arranged to be inclined outward in the opposite direction of the jacking, and the spigot side slope (215) is arranged to be inclined outward in the jacking direction. The first grouting hole (210) is distributed on the spigot side slope (215).

2. The rectangular jacking pipe grouting drag reduction pipe section device according to claim 1, characterized in that, The annular space (10) is further provided with the pressing mechanism (2) on its side, or the annular space (10) is provided with the pressing mechanism (2) on both its side and bottom.

3. The rectangular jacking pipe grouting drag reduction pipe section device according to claim 1, characterized in that, The socket side structure (11) is a socket side steel ring, the spigot side structure (12) is a spigot side steel ring, the outer wall of the spigot side steel ring is also provided with a sealing ring (14), and the inner wall of the socket side steel ring and the inner wall of the spigot side steel ring are respectively provided with reinforcing ribs (15).

4. The rectangular jacking pipe grouting drag reduction pipe section device according to claim 1, characterized in that, The annular space (10) has a straight edge space portion and a curved space portion. The retaining plate (21) includes a strip retaining plate (211) and a curved retaining plate (212). The strip retaining plate (211) is clearance-fitted with the straight edge space portion, and the curved retaining plate (212) is clearance-fitted with the curved space portion.

5. The rectangular jacking pipe grouting drag reduction pipe section device according to claim 2, characterized in that, The second grouting hole (100) is opened on the flange structure (13), and a guide plate (101) is also provided on the outside of the second grouting hole (100), and the guide plate (101) is flared outward.

6. A construction method for a rectangular pipe jacking grouting drag-reducing pipe section device according to claim 1, characterized in that, Includes the following steps: S1. Install a grouting drag reduction pipe section device on the rear side of the rectangular pipe jacking machine and in the middle of the tunnel. First, connect it to the spigot side structure of the previous pipe section through the socket side structure (11) and push it into the tunnel. Then, connect it to the next pipe section through the spigot side structure (12). S2. Start the jacking mechanism (2) according to the drag reduction requirements, and control the retaining plate (21) of the jacking mechanism (2) to push outward and squeeze the surrounding soil until the retaining plate (21) reaches the predetermined position. S3. Pressure grout is injected into the shield tail gap through the grouting pipeline (3) and the first grouting hole (210), and pressure grout is replenished through the grouting pipeline (3) and the second grouting hole (100); S4. After the jacking is completed, remove the jacking driver (22) so that the socket side structure (11) and the spigot side structure (12) are left in the tunnel, and seal the first grouting hole (210) and the second grouting hole (100).

Images