A spliced ​​pipe section for underground support and support method thereof

Abstract

The present invention discloses a spliced ​​pipe segment for underground support and a support method thereof, comprising a plurality of prefabricated pipe segments spliced ​​together, wherein both ends of the prefabricated pipe segment are respectively provided with a connecting block and a connecting groove, and the connecting block and the corresponding connecting groove are adapted to each other, an assembly groove is symmetrically provided on the inner side of the circular arc of the prefabricated pipe segment, a grouting groove is provided on the outer side of the circular arc of the prefabricated pipe segment, and a positioning block is provided on one side of the prefabricated pipe segment, and a positioning groove used for positioning in conjunction with the positioning block is provided on the other side of the prefabricated pipe segment, a grouting cavity is provided inside the prefabricated pipe segment, a grouting port is provided in the middle of the inner groove wall of the assembly groove, and a plurality of slurry outlets are provided on both groove walls of the grouting groove; the above structure is adopted to solve the difficulties in transporting, hoisting and storing the pipe segments, and can not only meet the requirements of not damaging the stress of the pipe segment structure, but also ensure the reinforcement effect and control the settlement during the operation period, so as to solve the problem of reinforcing the surrounding weak strata by shield and top pipe tunnels.

Description

Technical Field

[0001] The present invention relates to the technical field of shield and pipe-jacking tunnel engineering, and in particular to a spliced ​​pipe segment for underground support and a supporting method thereof. Background Art

[0002] Shield and pipe-jacking tunneling methods are currently the most widely used and important engineering technologies in underground tunnel construction. They offer advantages such as safety, speed, quality control, and a favorable construction environment. However, in liquefied sand or soft soil formations, shield and pipe-jacking tunneling methods can be susceptible to seismic liquefaction after completion. This can lead to significant settlement during operation, a long time to reach stability, and significant uneven settlement. This poses operational safety risks and can even endanger the structure. Many tunnels in soft strata in China have already experienced this problem.

[0003] In shield and pipe-jacking tunneling projects, the most common method for addressing earthquake liquefaction and controlling long-term operational settlement in soft soil strata is to reinforce the soft strata surrounding the tunnel during construction. Therefore, reinforcement design has always been a key difficulty in the design and construction of shield and pipe-jacking tunnels, especially when the tunnel is surrounded by soft soil or water-rich liquefied sand layers. Reinforcement is a particular challenge in terms of risk and quality control. Furthermore, due to the increasing cross-sectional area of ​​pipe segments used in underground roadway construction, their cross-sectional dimensions and weight have made transportation, lifting, and storage difficult. There is an urgent need to design a spliced ​​pipe segment suitable for roadway support construction that is easy to install and transport, and that can ensure the reinforcement effect and control operational settlement without compromising the structural stress of the segment. This is to address the issue of reinforcing the surrounding soft strata for shield and pipe-jacking tunneling. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a spliced ​​pipe segment for underground support and a support method thereof, so as to solve the difficulties in transportation, lifting and storage of pipe segments in the prior art, and to ensure the reinforcement effect without damaging the stress of the pipe segment structure and control the settlement during operation, so as to solve the problem of reinforcement of the surrounding soft strata by shield and jacking tunnels.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A spliced ​​pipe section for underground support comprises a plurality of prefabricated pipe segments spliced ​​together, wherein both ends of the prefabricated pipe segments are respectively provided with connecting blocks and connecting grooves, and the connecting blocks and corresponding connecting grooves are adapted to each other, an assembly groove is symmetrically provided on the inner side of the circular arc of the prefabricated pipe segment, a grouting groove is provided on the outer side of the circular arc of the prefabricated pipe segment, a positioning block is provided on one side of the prefabricated pipe segment, and a positioning groove for cooperating with the positioning block for positioning is provided on the other side of the prefabricated pipe segment, a grouting cavity is provided inside the prefabricated pipe segment, a grouting port is provided in the middle of the inner groove wall of the assembly groove, and a plurality of slurry outlets are provided on both groove walls of the grouting groove.

[0007] As a further solution of the present invention: the grouting port is connected to the grouting cavity, and the plurality of slurry outlets are all connected to the grouting cavity.

[0008] A method for supporting a spliced ​​pipe section for underground support uses the spliced ​​pipe section for underground support and includes the following steps:

[0009] Step 1: Install the pipe jacking machine at the pipe burying site, use the assembly device to assemble the first and second pipe sections in advance, then set the anchoring device in the first and second pipe sections behind the pipe jacking machine, and pre-open the construction holes in the middle of the prefabricated pipe segments in the first and second pipe sections, and then start the pipe jacking machine to advance;

[0010] Step 2: Multiple prefabricated pipe segments are automatically transported to the bottom of the assembly device via the transport track for automated assembly. The connection blocks and connection grooves of the prefabricated pipe segments cooperate with each other to complete the circumferential connection of the prefabricated pipe segments to form pipe segments. The assembled pipe segments are pushed into the tunnel using the pipe segment jacking device so that the positioning block of the front pipe segment is inserted into the positioning groove of the rear pipe segment in the forward direction to achieve the positioning of the two adjacent pipe segments. Then, the concrete coating device is used to fill the gaps in the connection of the prefabricated pipe segments with concrete to enhance the stability of the connection of the prefabricated pipe segments. The assembly device continues to automatically assemble the next pipe segment.

[0011] The anchoring device works while step 3 and step 2 are being carried out; the drill assembly of the anchoring device drills three holes in the soil outside the first pipe section behind the pipe jacking machine at a position relative to the construction hole, then starts the independent motor connected to the rotating spindle of the anchoring device, rotates the rotating spindle 180 degrees, and the drill assembly continues to drill holes. After the first circle of drilling is completed, the drill assembly moves forward to continue drilling. While the drill assembly is drilling, the anchoring device of the anchoring device completes the driving of three prefabricated anchor rods in the drilled holes, and automatically loads three new prefabricated anchor rods, and drives the prefabricated anchor rods as the drill assembly drills holes;

[0012] Step 4: During the process of the jacking pipe advancing forward, slurry is injected from the grouting port to lubricate the surrounding soil;

[0013] Step 5. Repeat steps 2 to 4 until all pipe segments are pushed into the tunnel. Dismantle the pipe jacking machine and hoist it out of the working well. Inject concrete slurry from the grouting port. The concrete slurry is sprayed from the slurry outlet into the soil outside the pipe segment to reinforce the soil. The prefabricated anchor rods and pipe segments are fixed with concrete.

[0014] As a further solution of the present invention: the method for assembling the pipe segment by the assembling device in step 1 is:

[0015] The assembly groove opened on the inner side of the arc of the prefabricated pipe segment is matched with the protrusion on the surface of the assembling device, so that the prefabricated pipe segment can be loaded onto the assembling device from the bottom of the assembling device. When the prefabricated pipe segment below the assembling device is loaded, the assembling device is rotated 60 degrees to leave a vacant position below the assembling device so that the next prefabricated pipe segment transported can be automatically loaded; until a whole circle of prefabricated pipe segments is assembled to form a pipe segment.

[0016] As a further solution of the present invention: the assembling device in step one is arranged at the buried opening of the pipe segment, and a protrusion is provided on the cylindrical surface of the assembling device, and the protrusion is adapted to the assembling groove.

[0017] As a further solution of the present invention: the anchoring device in step three includes a drill bit assembly, an anchoring device and a rotating main shaft, the drill bit assembly and the anchoring device are both arranged on the rotating main shaft, and the drill bit assembly and the anchoring device are arranged in opposite directions.

[0018] As a further solution of the present invention: in step three, the anchoring device drives the prefabricated anchor rod as a whole to the outside of the pipe segment. After the prefabricated anchor rod is driven to the outside of the pipe segment, it is separated from the pipe segment, and the rear end of the prefabricated anchor rod can slide relatively vertically in the grouting groove of the pipe segment. After the prefabricated anchor rod is driven, the soil on the outside can be reinforced.

[0019] Beneficial effects of the present invention:

[0020] 1. The arrangement of the prefabricated pipe segments, prefabricated anchor rods, anchoring devices, pipe jacking machines, assembly devices, and transport tracks of the present invention enables the prefabricated pipe segments to be spliced ​​in an automated manner and then pushed into the tunnel excavated by the pipe jacking machine. When the pipe jacking machine is excavating, the anchoring devices reinforce the soil outside the pipe jacking for the first time, thereby enhancing the stability of the pipe jacking construction. Finally, concrete grouting is performed to further reinforce the stability of the soil. The pipe jacking and the anchor rods are connected together by concrete, so that the pipe jacking supports the anchor rods, prevents the anchor rods from rebounding, and improves the stability of the soil reinforcement.

[0021] 2. During the forward advancement of the jacking pipe of the present invention, the prefabricated anchor rods driven into the soil can cooperate with the grouting grooves. The prefabricated anchor rods fixed in the soil can limit the jacking pipe by cooperating with the grouting grooves, so that the jacking pipe will not deviate during the forward advancement, and the grouting grooves can support the prefabricated anchor rods, so that the driven prefabricated anchor rods are not easy to bounce back. During the forward advancement of the jacking pipe, mud is injected from the grouting port to lubricate the surrounding soil, making it easier for the jacking pipe to advance forward.

[0022] 3. The present invention adopts a combination of anchor support and shotcrete support to reinforce the soil, which can not only meet the requirements of not damaging the stress of the segment structure, but also ensure the reinforcement effect and control the settlement during operation to solve the problem of reinforcement of the surrounding soft strata by shield and jacking tunnels. In addition, different from the shield construction commonly used in the prior art, the present invention adopts jacking construction to support the tunnel, improves the adaptability of jacking construction, and enables jacking construction to be used in surrounding soft strata or deeper strata, and improves the reinforcement effect of jacking construction on the soil.

[0023] 4. The pipe segments and anchor rods of the present invention are all prefabricated, which are easy to transport and install, solving the problems of difficult transportation, lifting and storage of pipe segments in the prior art.

[0024] 5. The arrangement of the connection groove, assembly groove, grouting groove and grouting cavity of the present invention enables the grouting cavity to be filled after the concrete slurry is injected. After the concrete solidifies, the grouting port and the slurry outlet will be sealed, thereby improving the waterproof performance of the jacking pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 This is a structural diagram of the present invention wherein the prefabricated pipe segments are assembled into pipe segments and then subjected to pipe jacking construction;

[0027] Figure 2 It is a right side schematic diagram of the prefabricated tube segment of the present invention;

[0028] Figure 3 It is a left side schematic diagram of the prefabricated tube segment of the present invention;

[0029] Figure 4 is a cross-sectional view of a prefabricated segment of the present invention;

[0030] Figure 5 This is a structural diagram of the assembly and burial of the prefabricated pipe segments of the present invention;

[0031] Figure 6 A schematic diagram showing the detailed structure of the assembling device of the present invention;

[0032] Figure 7It is a front view of the anchoring device of the present invention;

[0033] Figure 8 It is a rear view of the anchoring device of the present invention.

[0034] In the figure: 1. Prefabricated pipe segment; 2. Prefabricated anchor rod; 3. Anchoring device; 4. Pipe jacking machine; 5. Assembly device; 6. Transport track; 11. Connecting block; 12. Connecting groove; 13. Assembly groove; 131. Grouting port; 14. Grouting groove; 141. Grouting outlet; 15. Positioning block; 16. Positioning groove; 17. Grouting cavity; 31. Drill bit assembly; 32. Anchoring device; 33. Rotating main shaft; 34. Construction hole; 51. Bump. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] like Figures 1-8 As shown, a spliced ​​pipe segment for underground support includes: a prefabricated pipe segment 1, a prefabricated anchor rod 2, an anchoring device 3, a pipe jacking machine 4, an assembly device 5 and a transport track 6;

[0037] Among them Figure 2 、 Figure 3 and Figure 4 As shown, the above-mentioned prefabricated pipe segment 1 is provided with a connecting block 11, a connecting groove 12, an assembly groove 13, a grouting groove 14, a positioning block 15, a positioning groove 16 and a grouting cavity 17; the two ends of the prefabricated pipe segment 1 are respectively provided with a connecting block 11 and a connecting groove 12, and the connecting block 11 and the corresponding connecting groove 12 cooperate with each other to realize the circumferential connection of the prefabricated pipe segment 1, and multiple prefabricated pipe segments 1 are spliced ​​with each other through the connecting block 11 and the connecting groove 12; assembling grooves 13 are symmetrically opened on the inner side of the circular arc of the prefabricated pipe segment 1, and the two assembly grooves 13 are used in conjunction with the assembling device 5 to realize the automatic assembly of the prefabricated pipe segment 1; further, a grouting groove 14 is opened on the outer side of the circular arc of the prefabricated pipe segment 1 for grouting; and a positioning block 15 is provided on one side of the prefabricated pipe segment 1, and a positioning groove 16 for positioning with the positioning block 15 is opened on the other side of the prefabricated pipe segment 1, and the positioning block 15 and the positioning groove 16 are adapted to each other;

[0038] Further Figure 4As shown, a grouting cavity 17 is formed inside the prefabricated segment 1; a grouting port 131 is formed in the middle of one wall of the assembly groove 13, and the grouting port 131 is connected to the grouting cavity 17; a plurality of slurry outlets 141 are formed on both walls of the grouting groove 14, and the slurry outlets 141 are connected to the grouting cavity 17;

[0039] Further Figure 5 、 Figure 6 As shown, the above-mentioned assembling device 5 is arranged at the pipe segment embedding opening, and the assembling device 5 is driven to rotate by an independent motor; a protrusion 51 is provided on the cylindrical surface of the assembling device 5; the transport track 6 is arranged in front of the assembling device 5, and the transport track 6 is used for the automated transportation of multiple prefabricated pipe segments 1; the protrusion 51 can be used in conjunction with the assembling groove 13 to realize the automated assembly of the prefabricated pipe segments 1;

[0040] The above-mentioned anchoring device 3 is as follows Figure 7 、 Figure 8 As shown, the anchoring device 3 includes: a drill assembly 31, an anchoring device 32, a rotating spindle 33, and a construction hole 34. The anchoring device 3 is arranged behind the pipe jacking machine 4 in the forward direction, and the slag transportation and the anchoring device 3 are staggered by laying a slag transportation pipeline; the drill assembly 31 is arranged in the first pipe section immediately behind the pipe jacking machine 4, and the drill assembly 31 is an anchor drilling machine of the prior art, and the anchoring device 32 is arranged in the second pipe section immediately behind the pipe jacking machine 4, and the anchoring device 32 adopts the existing hydraulic jacking device, wherein the drill assembly 3 1 and the anchoring device 32 are respectively fixedly mounted on the surface of the rotating main shaft 33; the drill bit assembly 31 and the anchoring device 32 are arranged in opposite directions on the rotating main shaft 33 to balance the torque of the rotating main shaft 33 and reduce the driving torque of the independent motor driving the rotating main shaft 33; six construction holes 34 are evenly opened at corresponding positions on the first and second pipe sections immediately behind the forward direction of the pipe jacking machine 4; the drill bit assembly 31 and the anchoring device 32 can respectively extend out of the construction holes 34 to drill the soil outside and drive the prefabricated anchor rods 2 into the drilled holes;

[0041] In a preferred embodiment, the drill bit assembly 31 and the anchoring device 32 can drill three holes and drive three prefabricated anchor rods at the same time; after the drill bit assembly 31 has drilled three holes, the independent motor connected to the rotating main shaft 33 is started to rotate the rotating main shaft 33 180 degrees, so that the drill bit assembly 31 continues to drill holes. While the drill bit assembly 31 is drilling holes, the anchoring device 32 can complete the driving of three prefabricated anchor rods 2 and automatically load three new prefabricated anchor rods 2 for use in the next construction. The prefabricated anchor rods 2 are automatically transported to the anchoring device 2 by a transport vehicle set in the jacking tunnel. The anchoring device 32 drives the prefabricated anchor rod 2 as a whole to the outside of the pipe section. After the prefabricated anchor rod 32 is driven, the soil on the outside can be preliminarily reinforced.

[0042] A further method for supporting underground support with a spliced ​​pipe joint comprises the following specific steps:

[0043] S1: The pipe jacking machine 4 is installed at the pipe burying location and the anchoring device 3 is set in the first and second pipe sections immediately behind the pipe jacking machine 4 in the forward direction. Then the pipe jacking machine 4 starts to advance forward.

[0044] S2: A plurality of prefabricated pipe segments 1 are automatically transported to the bottom of the assembling device 5 via the transport track 6. The connecting blocks 11 and the connecting grooves 12 of the prefabricated pipe segments 1 cooperate with each other to realize the connection of the prefabricated pipe segments 1 in the circumferential direction. The assembling grooves 13 provided on the inner side of the arc of the prefabricated pipe segments 1 cooperate with the protrusions 51, so that the prefabricated pipe segments 1 are loaded onto the assembling device 5 from the bottom. When the prefabricated pipe segments 1 under the assembling device 5 are loaded, the assembling device 5 rotates 60 degrees, so that the vacant position under the assembling device 5 can be automatically loaded with the next transported prefabricated pipe segment 1; until a prefabricated pipe segment 1 is assembled After a full circle of prefabricated segments 1 is formed, a pipe segment jacking device (not shown) at the buried pipe segment location pushes the assembled full circle of prefabricated segments 1 into the tunnel. The pipe segment jacking device uses a conventional oil cylinder jacking device, so that the positioning block 15 of the forward segment is inserted into the positioning groove 16 of the subsequent segment to achieve positioning of the two adjacent segments. Then, the concrete coating device is used to fill the gaps where the prefabricated segments 1 are connected, so as to enhance the stability of the connection of the prefabricated segments 1. The assembly device 5 continues to automatically assemble the next segment, wherein the concrete coating device is a conventional high-pressure sprayer.

[0045] S3: When the prefabricated pipe segments 1 are being assembled at the buried pipe site, the anchoring devices 3 in the first and second pipe sections immediately behind the pipe jacking machine 4 are also working; after the drill assembly 31 has drilled three holes in the first pipe section, the independent motor connected to the rotating spindle 33 is started to rotate the rotating spindle 33 180 degrees, causing the drill assembly 31 to continue drilling. While the drill assembly 31 is drilling, the anchoring device 32 can complete the driving of three prefabricated anchor rods 2 and automatically load three new prefabricated anchor rods 2 in preparation for the next anchor rod driving. During construction, the prefabricated anchor rod 2 is automatically transported to the anchoring device 32 by a transport vehicle provided in the jacking tunnel; the drill bit assembly 31 and the anchoring device 32 can respectively extend out of the construction hole 34 to drill the soil outside and drive the prefabricated anchor rod 2 into the drilled hole; the anchoring device 32 drives the prefabricated anchor rod 2 as a whole to the outside of the pipe segment; the prefabricated anchor rod 2 is separated from the pipe segment after being driven to the outside of the pipe segment, and the rear end of the prefabricated anchor rod 2 can slide relatively vertically in the grouting groove 14 of the pipe segment, so that the prefabricated anchor rod 2 can perform preliminary reinforcement on the soil outside after being driven;

[0046] S4: During the process of the jacking pipe advancing forward, the prefabricated anchor rod 2 driven into the soil can cooperate with the grouting groove 14. The prefabricated anchor rod 2 fixed in the soil can limit the jacking pipe by cooperating with the grouting groove 14, so that the jacking pipe will not deviate during the process of advancing forward. In addition, the grouting groove 14 can support the prefabricated anchor rod 2, so that the driven prefabricated anchor rod 2 is not easy to rebound. During the process of the jacking pipe advancing forward, slurry is injected from the grouting port 131 to lubricate the surrounding soil, making it easier for the jacking pipe to advance forward.

[0047] S5: Repeat steps S2 to S4 until all the jacking pipes are pushed into the tunnel. The jacking machine 4 is disassembled and hoisted out of the working well, and concrete slurry is introduced from the grouting port 131. The concrete slurry is sprayed from the slurry outlet 141 into the soil outside the jacking pipe to further reinforce the soil. The prefabricated anchor rods 2 and the jacking pipes are fixed with concrete, which further enhances the reinforcing effect of the jacking pipe on the prefabricated anchor rods 2 and the soil.

[0048] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for supporting underground support with a spliced ​​pipe joint, characterized in that: A spliced ​​pipe section for underground support is used, and the spliced ​​pipe section for underground support includes a plurality of prefabricated pipe segments (1) spliced ​​together, wherein a connection block (11) and a connection groove (12) are respectively provided at both ends of the prefabricated pipe segment (1), and the connection block (11) and the corresponding connection groove (12) are adapted to each other, an assembly groove (13) is symmetrically provided on the inner side of the circular arc of the prefabricated pipe segment (1), a grouting groove (14) is provided on the outer side of the circular arc of the prefabricated pipe segment (1), and a positioning block is provided on one side of the prefabricated pipe segment (1). (15), a positioning groove (16) for positioning with the positioning block (15) is provided on the other side of the prefabricated pipe segment (1), a grouting cavity (17) is provided inside the prefabricated pipe segment (1), a grouting port (131) is provided in the middle of the inner groove wall of the assembly groove (13), and a plurality of grouting ports (141) are provided on both groove walls of the grouting groove (14); the grouting port (131) is communicated with the grouting cavity (17), and the plurality of grouting ports (141) are communicated with the grouting cavity (17); The support method includes the following steps: Step 1: Install a pipe jacking machine (4) at the pipe burying location, use an assembling device (5) to assemble the first and second pipe sections in advance, then set an anchoring device (3) in the first and second pipe sections behind the pipe jacking machine (4), and pre-open a construction hole (34) in the middle of the prefabricated pipe segments (1) in the first and second pipe sections, and then the pipe jacking machine (4) starts to advance forward; Step 2: The plurality of prefabricated pipe segments (1) are automatically transported to the bottom of the assembling device (5) via the transport track (6) for automatic assembly, wherein the connection blocks (11) and the connection grooves (12) of the prefabricated pipe segments (1) cooperate with each other to complete the connection of the prefabricated pipe segments (1) in the circumferential direction to form pipe segments, and the assembled pipe segments are pushed into the tunnel using the pipe segment jacking device so that the positioning block (15) of the front pipe segment in the forward direction is inserted into the positioning groove (16) of the rear pipe segment to achieve the positioning of the two adjacent pipe segments, and then the concrete coating device is used to fill the gaps where the prefabricated pipe segments (1) are connected to enhance the stability of the connection of the prefabricated pipe segments (1); the assembling device (5) continues to automatically assemble the next pipe segment; While step 3 and step 2 are being carried out, the anchoring device (3) is working; the drill assembly (31) of the anchoring device (3) drills three holes in the soil outside the first pipe section behind the pipe jacking machine (4) at a position relative to the construction hole (34), and then starts the independent motor connected to the rotating main shaft (33) of the anchoring device (3), so that the rotating main shaft (33) rotates 180 degrees, and the drill assembly (31) continues to drill holes. After the first circle of drilling is completed, the drill assembly (31) moves forward to continue drilling holes. While the drill assembly (31) is drilling holes, the anchoring device (32) of the anchoring device (3) completes the driving of three prefabricated anchor rods (2) in the drilled holes, and automatically loads three new prefabricated anchor rods (2), and drives the prefabricated anchor rods (2) as the drill assembly (31) drills holes; Step 4: During the process of the jacking pipe being pushed forward, slurry is injected from the grouting port (131) to lubricate the surrounding soil; Step 5: Repeat steps 2 to 4 until all the pipe sections are pushed into the tunnel. The pipe jacking machine (4) is disassembled and hoisted out of the working well, and concrete slurry is introduced from the grouting port (131). The concrete slurry is sprayed from the slurry outlet (141) into the soil outside the pipe section to reinforce the soil. The prefabricated anchor rods (2) are fixed to the pipe section by concrete.

2. A method for supporting underground support with a spliced ​​pipe joint according to claim 1, characterized in that: The method for assembling the pipe section of the assembly device (5) in step 1 is: The assembling groove (13) provided on the inner side of the arc of the prefabricated pipe segment (1) is matched with the protrusion (51) on the surface of the assembling device (5), so that the prefabricated pipe segment (1) is loaded onto the assembling device (5) from the bottom of the assembling device (5). When the prefabricated pipe segment (1) below the assembling device (5) is loaded, the assembling device (5) is rotated 60 degrees, so that a vacant position below the assembling device (5) is left to automatically load the next transported prefabricated pipe segment (1); until a whole circle of prefabricated pipe segments (1) is assembled to form a pipe segment.

3. A method for supporting underground support with a spliced ​​pipe joint according to claim 1, characterized in that: The assembling device (5) in step 1 is arranged at the buried opening of the pipe joint, and a protrusion (51) is provided on the cylindrical surface of the assembling device (5), and the protrusion (51) is adapted to the assembling groove (13).

4. A method for supporting underground support with a spliced ​​pipe joint according to claim 1, characterized in that: The anchoring device (3) in step three comprises a drill assembly (31), an anchoring device (32) and a rotating main shaft (33). The drill assembly (31) and the anchoring device (32) are both arranged on the rotating main shaft (33), and the drill assembly (31) and the anchoring device (32) are arranged in opposite directions.

5. A method for supporting underground support with a spliced ​​pipe joint according to claim 1, characterized in that: In step three, the anchoring device (32) drives the prefabricated anchor rod (2) as a whole to the outside of the pipe segment. After the prefabricated anchor rod (2) is driven to the outside of the pipe segment, it is separated from the pipe segment, and the rear end of the prefabricated anchor rod (2) can slide relatively vertically in the grouting groove (14) of the pipe segment. After the prefabricated anchor rod (2) is driven, the soil on the outside can be reinforced.

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