Concrete pipe section for roadway support and its supporting method

Abstract

The application discloses a concrete pipe joint for roadway support and a support method thereof, which comprises prefabricated pipe segments and prefabricated anchor rods; one side of the prefabricated pipe segment is provided with a connecting block, the other side is provided with a connecting groove, an anchor rod mounting port is vertically arranged in the middle of the prefabricated pipe segment, an internal thread is arranged in the anchor rod mounting port, a positioning block and a positioning groove are arranged on the other two sides of the prefabricated pipe segment respectively, a driving groove is arranged in the prefabricated anchor rod, an external thread is arranged on the outer surface of the prefabricated anchor rod, a plurality of groups of grouting holes are arranged on the outer wall of the prefabricated anchor rod, and the plurality of groups of grouting holes are in through communication with the inside of the driving groove; the structure is used for effectively utilizing the anchor rod support and the cooperation of the sprayed concrete support to reinforce the soil, can meet the requirement of not damaging the stress of the pipe segment structure, can guarantee the reinforcement effect, can control the settlement in the operation period, and can solve the problem of reinforcing the surrounding soft stratum of the shield and the pipe-jacking tunnel.

Description

Technical Field

[0001] This invention relates to the field of shield tunneling and pipe jacking tunnel engineering technology, specifically to a concrete pipe section for tunnel support and its support method. Background Technology

[0002] Shield tunneling and pipe jacking are currently the most widely used and important engineering technologies in underground tunnel construction, offering advantages such as safety, speed, quality control, and favorable construction environment. However, in liquefiable sand layers or soft soil strata, shield and pipe jacking tunnels face seismic liquefaction issues after construction, resulting in significant settlement during operation, a long time required to reach stability, and markedly uneven settlement. This leads to operational safety problems and may even jeopardize structural safety. Many tunnels in soft soil strata in China have already experienced these issues.

[0003] In shield tunneling and pipe jacking tunnel engineering, the most common method to address seismic liquefaction and control long-term operational settlement in soft soil strata is to reinforce the surrounding weak strata during construction. Therefore, reinforcement design has always been a key challenge in the design and construction of shield and pipe jacking tunnels, especially when the surrounding soil is soft soil or water-rich liquefiable sand layers. How to reinforce these areas presents significant risks and quality control challenges. Furthermore, as the cross-sectional area of ​​pipe segments used in underground tunnel construction increases, their dimensions and weight create difficulties in transportation, hoisting, and storage. There is an urgent need to design a prefabricated segment suitable for tunnel support construction, facilitating installation and transportation while ensuring that the segment structure is not damaged, the reinforcement effect is guaranteed, and operational settlement is controlled, thus addressing the reinforcement problem of surrounding weak strata in shield and pipe jacking tunnels. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a concrete pipe section for tunnel support and its support method, which solves the difficulties in transporting, hoisting and storing pipe sections in the prior art, and can both meet the requirements of not damaging the stress of the pipe segment structure and ensuring the reinforcement effect, and control the settlement during operation, so as to solve the problem of reinforcement of the surrounding soft strata by shield tunnels and pipe jacking tunnels.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A concrete pipe section for roadway support and its support method, comprising precast pipe segments and precast anchor bolts, wherein multiple sets of precast pipe segments and precast anchor bolts are provided, and the multiple sets of precast anchor bolts are installed on the multiple sets of precast pipe segments in a one-to-one correspondence.

[0007] The precast segment has a connecting block on one side and a connecting groove on the other side. An anchor bolt installation port is vertically opened through the middle of the precast segment, and the anchor bolt installation port is provided with internal threads. Positioning blocks and positioning grooves are respectively set on the other two sides of the precast segment. A drive groove is opened inside the precast anchor bolt, and an external thread is provided on the outer surface of the precast anchor bolt. Multiple sets of grouting holes are opened on the outer wall of the precast anchor bolt, and all sets of grouting holes are connected to the inside of the drive groove.

[0008] As a further aspect of the present invention: the connecting block and the connecting groove are mutually adapted, and the positioning block and the positioning groove are mutually adapted.

[0009] As a further aspect of the present invention: the drive groove is cross-shaped and is disposed through the top end of the prefabricated anchor rod.

[0010] As a further aspect of the present invention: the external thread on the outer surface of the prefabricated anchor rod is compatible with the internal thread in the anchor rod installation opening.

[0011] As a further aspect of the present invention: a method for supporting concrete pipe sections for tunnel support, comprising the following steps:

[0012] Step 1: Use a tunnel boring machine to excavate and connect multiple sets of precast tunnel segments in a circumferential direction to form the first ring of concrete tunnel segments;

[0013] Step 2: Use a reinforcement device to pre-load the precast anchor rods on the outside, and then move them into the inside of the installed first ring of concrete pipe sections; align each precast anchor rod with the corresponding anchor rod installation port, and make the external thread of the precast anchor rod match the internal thread of the anchor rod installation port;

[0014] Step 3: Start the motor of the drive mechanism. The motor drives the first bevel gear to drive the six second bevel gears to rotate, which in turn drives the six drive tubes to rotate. The drive tubes drive the precast anchor rods to rotate around their own axes. The precast anchor rods rotate outward from inside the concrete pipe section and are driven into the external soil to reinforce the external soil.

[0015] Step 4: After the precast anchor rod extends to the set length, the grouting mechanism inputs concrete slurry into the drive pipe. The drive pipe feeds the concrete slurry into the drive groove and sprays it out from the grouting hole of the precast anchor rod. The precast anchor rod rotates and sprays concrete slurry into the soil outside the tunnel to reinforce the soil until the precast anchor rod extends to the deepest depth. The precast anchor rod will automatically separate from the reinforcement device, and the reinforcement is completed.

[0016] Step 5: Position the precast tunnel segments using positioning blocks and positioning slots, and continue installing another ring of precast tunnel segments in the forward direction of the tunnel boring machine;

[0017] Step Six: The precast anchor rods were loaded during the installation of the precast segments using a reinforcement device, and moved into the installed concrete pipe section after one round of precast segment installation was completed; each precast anchor rod was aligned with the corresponding anchor rod installation port, and the external thread of the precast anchor rod was made to engage with the internal thread of the anchor rod installation port.

[0018] Step 7: Repeat steps 3 and 4 to complete the reinforcement;

[0019] Step 8: Fill the gaps at the joints of the two precast segments with concrete to further reinforce the concrete pipe sections;

[0020] Step 9: Repeat steps 5 through 8 until the tunnel boring machine (TBM) construction is completed.

[0021] As a further aspect of the present invention: the reinforcement device used in step two includes a grouting mechanism, a driving mechanism, and an anchoring mechanism;

[0022] The grouting mechanism has a grouting port at the top, and the anchoring mechanism includes six fixed pipes. The six fixed pipes are connected to one end of the grouting mechanism at equal angles, and all six fixed pipes are connected to the inside of the grouting mechanism. A bevel gear two is rotatably installed at the other end of the fixed pipe, and a drive pipe is fixedly connected to the other end of the bevel gear two. The drive pipe, bevel gear two, and fixed pipe are interconnected. The drive mechanism includes a motor and a bevel gear one. The bevel gear one meshes with six bevel gear twos, and the bevel gear one is installed on the output shaft of the motor.

[0023] The beneficial effects of this invention are:

[0024] 1. This invention uses a combination of precast anchor bolt support and shotcrete support to reinforce the soil, which can both ensure the structural integrity of the precast tunnel segments without damaging them and guarantee the reinforcement effect, while controlling settlement during operation, thus solving the problem of reinforcing the surrounding soft soil layers of shield tunnels and pipe jacking tunnels.

[0025] 2. The segments and anchor bolts of the present invention are all prefabricated, which is easy to transport and install. Furthermore, the prefabricated anchor bolts and prefabricated segments are connected by a threaded connection, which makes it difficult for the prefabricated anchor bolts to retract after being rotated and installed, thereby enhancing the stability of the connection between the prefabricated anchor bolts and the prefabricated segments.

[0026] 3. The reinforcement device of the present invention allows multiple precast anchor rods to be installed at one time, and concrete is sprayed onto the outer soil while the precast anchor rods are being installed. The rotating spraying method improves the concrete slurry and diffusion efficiency, further enhancing the soil reinforcement effect.

[0027] 4. The anchoring device of the present invention is connected to the drive groove of the precast anchor rod through the drive pipe. The cooperation between the cross-shaped drive pipe and the cross-shaped drive groove makes it easy to load the precast anchor rod onto the anchoring mechanism, thereby enhancing construction efficiency. Attached Figure Description

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the precast segment structure in this invention. Figure 1 ;

[0031] Figure 3 This is a schematic diagram of the precast segment structure in this invention. Figure 2 ;

[0032] Figure 4 This is a schematic diagram of the prefabricated anchor structure in this invention;

[0033] Figure 5 This is a schematic diagram of the reinforcement device structure in this invention;

[0034] Figure 6 This is a schematic diagram of the anchoring mechanism in this invention.

[0035] In the diagram: 1. Precast segment; 2. Precast anchor bolt; 3. Reinforcing device; 11. Connecting block; 12. Connecting groove; 13. Anchor bolt installation port; 14. Positioning block; 15. Positioning groove; 21. Drive groove; 22. Grouting hole; 31. Grouting mechanism; 311. Grouting port; 32. Drive mechanism; 321. Motor; 322. Bevel gear one; 33. Anchoring mechanism; 331. Bevel gear two; 332. Drive pipe; 333. Fixing pipe. Detailed Implementation

[0036] 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.

[0037] like Figure 1 - Figure 6 As shown, this is a concrete pipe section for roadway support. The concrete pipe section includes multiple sets of precast pipe segments 1 and multiple sets of precast anchor rods 2. The multiple sets of precast pipe segments 1 are assembled together to form the concrete pipe section, and the multiple sets of precast anchor rods 2 are installed one-to-one on the multiple sets of precast pipe segments 1 to further fix the concrete pipe section.

[0038] Further as Figure 2 and Figure 3As shown, the precast segment 1 is provided with a connecting block 11 on one side and a connecting groove 12 on the other side. The connecting block 11 and the connecting groove 12 cooperate with each other to achieve circumferential connection of the precast segment 1. An anchor bolt installation port 13 is vertically opened through the middle of the precast segment 1. The anchor bolt installation port 13 is provided with internal thread. On the other two sides of the precast segment 1, positioning blocks 14 and positioning grooves 15 with matching positioning blocks 14 are respectively provided. The positioning block 14 of the precast segment 1 is inserted into the positioning groove 15 of another precast segment 1 to achieve horizontal positioning of the two precast segments 1.

[0039] Further as Figure 4 As shown, the precast anchor rod 2 has a drive groove 21 inside. The drive groove 21 can be of various shapes, such as a cross-shaped groove. The drive groove 21 is used to cooperate with the inserted cross-shaped object to drive the precast anchor rod 2 to rotate around its own axis. Furthermore, the drive groove 21 is set through the top end of the precast anchor rod 2, and the outer surface of the precast anchor rod 2 is provided with an external thread that cooperates with the internal thread of the anchor rod installation port 13. Multiple sets of grouting holes 22 are also opened on the outer wall of the precast anchor rod 2, and the grouting holes 22 are all connected through the drive groove 21.

[0040] Furthermore, the present invention also discloses a method for supporting concrete pipe sections for tunnel support, the specific steps of which are as follows:

[0041] Step 1: Use a tunnel boring machine to excavate and connect multiple sets of precast tunnel segments 1 in a circumferential direction to form the first ring of concrete tunnel sections;

[0042] Step 2: Use the reinforcement device 3 to preload the precast anchor rods 2 on the outside, and then move them into the inside of the installed first ring of concrete pipe sections; align each precast anchor rod 2 with the corresponding anchor rod installation port 13, and make the external thread of the precast anchor rod 2 match the internal thread of the anchor rod installation port 13.

[0043] Step 3: Start the motor 321 of the drive mechanism 32. The motor 321 drives the first bevel gear 322 to drive the six second bevel gears 331 to rotate, which in turn drives the six drive tubes 332 to rotate. The drive tubes 332 drive the precast anchor rods 2 to rotate around their own axis. The precast anchor rods 2 rotate outward from inside the concrete pipe section and are driven into the external soil to reinforce the external soil.

[0044] Step 4: After the precast anchor rod 2 extends to the set length, the grouting mechanism 31 starts to input concrete slurry into the drive pipe 332. The drive pipe 332 inputs the concrete slurry into the drive groove 21 and sprays it out from the grouting hole 22 of the precast anchor rod 2. The precast anchor rod 2 rotates and sprays concrete slurry into the soil outside the tunnel to reinforce the soil. The rotating spraying method improves the concrete slurry and diffusion efficiency until the precast anchor rod 2 extends to the deepest depth. The precast anchor rod 2 will automatically separate from the reinforcement device 3 to complete the reinforcement.

[0045] Step 5: Position the precast segment 1 using positioning block 14 and positioning slot 15, and the tunnel boring machine continues to install one more ring of precast segment 1 in the forward direction;

[0046] Step 6: The precast anchor rods 2 were loaded during the installation of the precast segment 1 using the reinforcement device 3, and moved into the installed concrete pipe section after the precast segment 1 was installed in one circle; each precast anchor rod 2 was aligned with the corresponding anchor rod installation port 13, and the external thread of the precast anchor rod 2 was made to match the internal thread of the anchor rod installation port 13.

[0047] Step 7: Repeat steps 3 and 4 to complete one ring of concrete pipe sections;

[0048] Step 8: Fill the gap at the connection between the two precast segments 1 with concrete to further reinforce the concrete pipe section;

[0049] Step 9: Repeat steps 5 through 8 until the tunnel boring machine (TBM) construction is completed.

[0050] The concrete pipe section support method used in this tunnel support employed reinforcement device 3;

[0051] like Figure 5 and Figure 6 As shown, the reinforcement device 3 mentioned above includes a grouting mechanism 31, a driving mechanism 32, and an anchoring mechanism 33;

[0052] The grouting mechanism 31 is located inside the tunnel boring machine. A grouting port 311 is located at the top of the grouting mechanism 31 for injecting concrete grout. The anchoring mechanism 33 includes six fixed pipes 333. The other end of the grouting mechanism 31 is connected at equal angles to the six fixed pipes 333 around the axis of the grouting mechanism 31, and all six fixed pipes 333 are connected to the interior of the grouting mechanism 31. A bevel gear 331 is rotatably mounted on the other end of each fixed pipe 333. The bevel gear 331 rotates and seals with the fixed pipe 333, and the small end face of the bevel gear 331 is flush with the fixed pipe 333. The drive tube 332 is fixedly installed on the large end face of the second bevel gear 331. The outer surface of the drive tube 332 is cross-shaped (adapted to the shape of the drive groove 21) and can be inserted into the drive groove 21 to drive the precast anchor rod 2 to rotate. The drive tube 332 and the interior of the second bevel gear 331 are connected and communicate with the fixed tube 333. The drive mechanism 32 includes a motor 321 and a first bevel gear 322. The six second bevel gears 331 are driven by a common first bevel gear 322. The first bevel gear 322 is driven by an independent motor 321 installed inside the tunnel boring machine.

[0053] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A method for supporting concrete pipe sections for roadway support, characterized in that, Includes the following steps: Step 1: Use a tunnel boring machine to excavate and connect multiple sets of precast segments (1) in the circumferential direction to form the first ring of concrete pipe sections; Step 2: Use the reinforcement device (3) to preload the precast anchor rods (2) on the outside, and then move them into the inside of the installed first ring of concrete pipe sections; align each precast anchor rod (2) with the corresponding anchor rod installation port (13), and make the external thread of the precast anchor rod (2) match the internal thread of the anchor rod installation port (13); Step 3: Start the motor (321) of the drive mechanism (32). The motor (321) drives the first bevel gear (322) to drive the six second bevel gears (331) to rotate, which in turn drives the six drive tubes (332) to rotate. The drive tubes (332) drive the precast anchor rods (2) to rotate around their own axis. The precast anchor rods (2) rotate outward from inside the concrete pipe section and are driven into the external soil to reinforce the external soil. Step 4: After the precast anchor rod (2) extends to the set length, the grouting mechanism (31) inputs concrete slurry into the drive pipe (332). The drive pipe (332) inputs the concrete slurry into the drive groove (21) and sprays it out from the grouting hole (22) of the precast anchor rod (2). The precast anchor rod (2) rotates and sprays concrete slurry into the soil outside the tunnel to reinforce the soil until the precast anchor rod (2) extends to the deepest depth. The precast anchor rod (2) will automatically separate from the reinforcement device (3) to complete the reinforcement. Step 5: Position the precast tunnel segment (1) using the positioning block (14) and positioning groove (15), and the tunnel boring machine continues to install a ring of precast tunnel segments (1) in the forward direction. Step 6: The precast anchor rods (2) were loaded during the installation of the precast segments (1) using the reinforcement device (3), and moved into the installed concrete pipe section after the precast segments (1) were installed in one circle; each precast anchor rod (2) was aligned with the corresponding anchor rod installation port (13), and the external thread of the precast anchor rod (2) was made to match the internal thread of the anchor rod installation port (13); Step 7: Repeat steps 3 and 4 to complete the reinforcement; Step 8: Fill the gap at the connection of the two precast pipe segments (1) with concrete to further reinforce the concrete pipe section; Step 9: Repeat steps 5 through 8 until the tunnel boring machine (TBM) construction is completed; The concrete pipe section for roadway support includes precast pipe segments (1) and precast anchor bolts (2). Multiple sets of precast pipe segments (1) and precast anchor bolts (2) are provided, and multiple sets of precast anchor bolts (2) are installed on multiple sets of precast pipe segments (1) in a one-to-one correspondence. One side of the precast segment (1) is provided with a connecting block (11) and the other side is provided with a connecting groove (12). The middle of the precast segment (1) is vertically opened with an anchor bolt installation port (13). The anchor bolt installation port (13) is provided with an internal thread. The other two sides of the precast segment (1) are respectively provided with a positioning block (14) and a positioning groove (15). The precast anchor bolt (2) is provided with a driving groove (21) inside. The outer surface of the precast anchor bolt (2) is provided with an external thread. The outer wall of the precast anchor bolt (2) is provided with multiple sets of grouting holes (22). All sets of grouting holes (22) are connected to the inside of the driving groove (21).

2. The support method for concrete pipe sections used in roadway support according to claim 1, characterized in that, The reinforcement device (3) used in step two includes a grouting mechanism (31), a driving mechanism (32), and an anchoring mechanism (33). The grouting mechanism (31) has a grouting port (311) at the top, and the anchoring mechanism (33) includes six fixed pipes (333). The six fixed pipes (333) are connected to one end of the grouting mechanism (31) at equal angles, and all six fixed pipes (333) are connected to the inside of the grouting mechanism (31). The other end of the fixed pipe (333) is rotatably provided with a bevel gear (331), and the other end of the bevel gear (331) is fixedly connected with a drive pipe (332). The drive pipe (332), the bevel gear (331) and the fixed pipe (333) are interconnected. The drive mechanism (32) includes a motor (321) and a bevel gear (322). The bevel gear (322) meshes with the six bevel gears (331), and the bevel gear (322) is set on the output shaft of the motor (321).

3. The support method for concrete pipe sections used in roadway support according to claim 1, characterized in that, The connecting block (11) and the connecting groove (12) are adapted to each other, and the positioning block (14) and the positioning groove (15) are adapted to each other.

4. The method for supporting concrete pipe sections for roadway support according to claim 3, characterized in that, The drive groove (21) is cross-shaped and extends through the top of the precast anchor rod (2).

5. The support method for concrete pipe sections used in roadway support according to claim 4, characterized in that, The external thread on the outer surface of the precast anchor rod (2) is compatible with the internal thread in the anchor rod installation port (13).

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