A main tunnel support mechanism for a shield connection passage and its construction method

Abstract

The present invention relates to the technical field of tunnel construction, and specifically to a main tunnel support mechanism for a shield connection tunnel and its construction method. The shield reaction frame is installed in the main tunnel segment, and the main tunnel segment is installed in the main tunnel of the shield connection tunnel. A reinforcement connecting piece is provided between the shield reaction frame and the main tunnel segment for installing the shield reaction frame in the inner ring opening of the main tunnel segment. The outer ring surface of the shield reaction frame is provided with a pre-buried installation piece for fixing one end of a high-strength cable. The beneficial effects are as follows: The main tunnel support mechanism for the shield connection tunnel and its construction method proposed by the present invention transfer the force exerted by the shield propulsion on the main tunnel segment to the soil layer or rock layer by using the cable, reducing the tensile force borne by the segment, and enabling the safe and efficient construction of the connection tunnel; the force transmission path on the cable is simple and clear, the construction is convenient, and the occupied space is small, leaving sufficient space for the shield machine construction.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and particularly to a main tunnel support mechanism for a shield connecting passage and a construction method thereof. Background Technique

[0002] In soft and water-bearing strata where ground structures are not allowed to be demolished and construction conditions are difficult, the use of the shield method for construction can show its advantages such as high mechanization level, small vibration, low noise, fast construction speed, reliability, and little impact on residents along the line, underground and ground structures and buildings. When using the shield method for connecting passage construction, the impact on the surrounding environment can be minimized. However, due to the cutting of the connecting passage portal, the main tunnel structure is damaged, and the main tunnel needs to provide reaction force during the cutting and propulsion process. If the propulsion reaction force of the shield machine is large or the support for the main tunnel segment is insufficient, once an accident occurs, the built tunnel will be damaged, thus affecting the construction period and causing greater economic losses.

[0003] In the prior art, when using the shield method for connecting passage construction, the support for the main tunnel segment mainly uses post-grouting reinforcement behind the main tunnel wall to enhance the uniformity and integrity of soil stress, and a tunnel internal support system is used to improve the anti-deformation ability of the main tunnel structure. However, this system is complex to install and occupies a large space, further reducing the limited construction space and affecting the construction efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a main tunnel support mechanism for a shield connecting passage and a construction method thereof to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A main tunnel support mechanism for a shield connecting passage, including a shield machine reaction frame installed in the main tunnel segment, and the main tunnel segment is installed in the main tunnel of the shield connecting passage. There is a reinforcement connecting piece between the shield machine reaction frame and the main tunnel segment for installing the shield machine reaction frame in the inner ring opening of the main tunnel segment. The outer ring surface of the shield machine reaction frame is provided with a pre-embedded installation piece for fixing one end of a high-strength cable. The other end of the high-strength cable penetrates through the main tunnel segment and is inserted into the soil layer. A buffer mechanism is installed on the outer ring surface of the shield machine reaction frame to reduce the impact of the vibration generated during the installation of the high-strength cable on the main tunnel segment.

[0006] Preferably, the shield machine reaction frame has an octagonal ring plate structure, the inner ring opening of the shield machine reaction frame is a circular opening, the outer ring surface of the shield machine reaction frame is fixed with cushion blocks, the cushion blocks have a circular arc plate structure, there are four groups of cushion blocks, and the cushion blocks are arranged in a "cross" shape. There are four groups of reinforcement connecting pieces, and the four groups of reinforcement connecting pieces are distributed in a "cross" shape in the circular opening of the shield machine reaction frame.

[0007] Preferably, the reinforcement connecting member includes a reserved hole and a reinforcing bolt. The reserved hole is opened in the circular opening of the shield machine reaction frame. The reserved hole is in a "T" shape and penetrates through the shield machine reaction frame and the cushion block. The reinforcing bolt penetrates through the reserved hole and is screwed on the inner ring surface of the main tunnel segment.

[0008] Preferably, there are four groups of the embedded installation members. Each group of the embedded installation members and the cushion blocks are distributed alternately on the outer ring surface of the shield machine reaction frame. The embedded installation member includes an installation groove and an embedded shaft. The installation groove is a square groove, which is opened on the outer ring surface of the shield machine reaction frame, and there are multiple installation grooves arranged side by side. The embedded shaft is fixed on two parallel side walls of the installation groove. One end of the high-strength cable is bolted and fixed on the embedded shaft. A flange is sleeved and fixed at one end of the high-strength cable, and the flange is fixed on the outer ring surface of the shield machine reaction frame through installation bolts.

[0009] Preferably, pouring holes are opened on the surface of the main tunnel segment. The pouring holes correspond to the high-strength cables one by one. The high-strength cables penetrate through the pouring holes and are inserted into the soil layer.

[0010] Preferably, the buffer mechanism includes a support block, a reserved groove, a buffer block, a rubber gasket, a docking groove, a guide post, a spring and a rubber traction post. The support block is in a circular arc plate-like structure. There are two groups of support blocks, which are symmetrically distributed about the installation groove, and both groups of support blocks are fixed on the outer ring surface of the shield machine reaction frame. The reserved groove is opened on the surface of the support block. The width of the groove opening of the reserved groove is smaller than the bottom width of the support block, and the reserved groove penetrates through the support block.

[0011] Preferably, the buffer block is in a square block shape. One end of the buffer block extending towards the inner ring surface of the main tunnel segment is in a circular arc curved surface. The rubber gasket is fixed on the circular arc curved surface, and the rubber gasket abuts against the inner ring surface of the main tunnel segment. The buffer block is movably inserted into the reserved groove. The docking groove is opened at the other end of the buffer block. One end of the guide post is movably inserted into the docking groove, and the other end of the guide post is fixed on the outer ring surface of the shield machine reaction frame. The spring is sleeved on the rod body of the guide post, and the spring is fixed between the docking groove and the outer ring surface of the shield machine reaction frame.

[0012] Preferably, there are multiple rubber traction posts, which are arranged around the spring, and all the rubber traction posts are fixed between the docking groove and the outer ring surface of the shield machine reaction frame. A limiting component is arranged between the buffer block and the outer ring surface of the shield machine reaction frame.

[0013] Preferably, the limiting component includes a sliding groove, a sliding block, a traction plate and a rubber clamping block. The sliding groove is opened on the surface of the buffer block. The sliding block is slidably connected in the sliding groove. The sliding block is fixed at one end of the traction plate. The traction plate is in an "L" shaped plate-like structure. The other end of the traction plate is fixed on the surface of the reserved groove. The rubber clamping block is fixed between the other end of the traction plate and the buffer block.

[0014] A construction method of a main tunnel support mechanism for a shield connection passage, the construction method comprising the following steps:

[0015] According to the on-site survey and its construction deployment situation, hoist the shield machine into the shaft from the established position, assemble and transport it to the entrance of the connection passage, and determine the direction in which the high-strength cable radiates outward, so as to determine the position where the high-strength cable is fixed on the shield machine reaction frame;

[0016] Fix the shield machine reaction frame at the segment in front of the connection passage entrance, and install anti-shock springs on the outside of the reaction frame to prevent damage to the tunnel segments when driving the high-strength cable. Using the shield machine reaction frame as a reaction device, drive the high-strength cable into the soil mass through the reserved holes on the main tunnel segments at the designed angle, and promptly grout the reserved holes to take good waterproof measures to avoid water leakage;

[0017] Embed the cable driven into the soil mass into the position determined by the shield machine reaction frame and fix it with bolts; install the negative ring, and the shield machine is ready for tunneling construction. During the tunneling process of the shield machine, closely monitor the state of the high-strength cable, the reserved holes of the segments, and the segments behind the shield machine reaction frame. If abnormal elongation rate of the cable, cable breakage or water seepage in the reserved holes occurs, stop immediately, check and handle in time.

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

[0019] The shield connection passage main tunnel support mechanism and its construction method proposed by the present invention transfer the force exerted by the shield machine during propulsion on the main tunnel segments to the soil layer or rock layer by using cables, reducing the tensile force borne by the segments and enabling safe and efficient construction of the connection passage; the force transmission path on the cable is simple and clear, the construction is convenient, and the occupied space is small, leaving sufficient space for the shield machine construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a semi-sectional schematic structural diagram of the present invention;

[0022] Figure 3 is a schematic structural diagram of the shield machine reaction frame of the present invention;

[0023] Figure 4 is a schematic diagram of the shield machine reaction frame of the present invention after being partially cut open;

[0024] Figure 5 is Figure 4 an enlarged schematic diagram of the structure at A in

[0025] Figure 6 is a schematic structural diagram of the buffer block of the present invention;

[0026] Figure 7 Schematic diagram of the support block structure of the present invention;

[0027] Figure 8 Schematic diagram of the installation structure of the embedded shaft of the present invention.

[0028] In the figure: shield machine reaction frame 1, main tunnel segment 2, cushion block 3, reserved hole 4, strengthening bolt 5, installation groove 6, embedded shaft 7, high-strength cable 8, flange 9, installation bolt 10, pouring hole 11, support block 12, reserved groove 13, buffer block 14, rubber gasket 15, docking groove 16, guide post 17, spring 18, rubber traction post 19, sliding groove 20, slider 21, traction plate 22, rubber clamping block 23. Specific embodiments

[0029] In order to clearly and completely describe the objectives, technical solutions of the present invention, and make the advantages more clearly understood, the following further elaborates on the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are merely used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0030] Embodiment 1

[0031] Please refer to Figures 1 to 3, the present invention provides a technical solution: a main tunnel support mechanism for a shield connection passage, including a shield reaction frame 1, the shield reaction frame 1 is installed in the main tunnel segment 2, and the main tunnel segment 2 is installed in the main tunnel of the shield connection passage. A reinforcement connecting member is provided between the shield reaction frame 1 and the main tunnel segment 2 for installing the shield reaction frame 1 in the inner ring opening of the main tunnel segment 2. The shield reaction frame 1 is in the shape of an octagonal ring plate structure, the inner ring opening of the shield reaction frame 1 is a circular opening, a cushion block 3 is fixed on the outer ring surface of the shield reaction frame 1, the cushion block 3 is in the shape of a circular arc plate structure, there are four groups of cushion blocks 3, and the cushion blocks 3 are arranged in a "cross" shape. There are four groups of reinforcement connecting members, and the four groups of reinforcement connecting members are distributed in a "cross" shape in the circular opening of the shield reaction frame 1. The reinforcement connecting member includes a reserved hole 4 and a reinforcing bolt 5. The reserved hole 4 is opened in the circular opening of the shield reaction frame 1, the reserved hole 4 is in the shape of a "T" - shaped opening, the reserved hole 4 penetrates through the shield reaction frame 1 and the cushion block 3, and the reinforcing bolt 5 penetrates through the reserved hole 4 and is screwed on the inner ring surface of the main tunnel segment 2. An embedded installation member is provided on the outer ring surface of the shield reaction frame 1 for fixing one end of a high - strength cable 8. The other end of the high - strength cable 8 penetrates through the main tunnel segment 2 and is inserted into the soil layer. A buffer mechanism is installed on the outer ring surface of the shield reaction frame 1 to reduce the impact of the vibration generated during the installation of the high - strength cable 8 on the main tunnel segment 2; by using the cable to transfer the force exerted by the shield machine during propulsion on the main tunnel segment to the soil layer or rock formation, the tensile force borne by the segment is reduced, and the connection passage is constructed safely and efficiently; the force transmission path on the cable is simple and clear, the construction is convenient, and the occupied space is small, leaving sufficient space for the shield machine construction.

[0032] Embodiment Two

[0033] Refer to the attached Figure 8 , on the basis of Embodiment One, in order to fix one end of the high - strength cable 8 on the shield reaction frame 1, there are four groups of embedded installation members, and each group of embedded installation members and the cushion block 3 are distributed alternately on the outer ring surface of the shield reaction frame 1. The embedded installation member includes an installation groove 6 and an embedded shaft 7. The installation groove 6 is a square groove, the installation groove 6 is opened on the outer ring surface of the shield reaction frame 1, and there are multiple installation grooves 6 arranged side by side. The embedded shaft 7 is fixed on two parallel side walls of the installation groove 6. One end of the high - strength cable 8 is bolted and fixed on the embedded shaft 7. One end of the high - strength cable 8 is sleeved and fixed with a flange plate 9, and the flange plate 9 is fixed on the outer ring surface of the shield reaction frame 1 through an installation bolt 10; pouring holes 11 are opened on the surface of the main tunnel segment 2, and the pouring holes 11 correspond to the high - strength cables 8 one by one. The high - strength cable 8 penetrates through the pouring hole 11 and is inserted into the soil layer;

[0034] After fixing one end of the eight high-strength cables sleeved with the flange 9 on the surface of the embedded shaft 7, the flange 9 is fixed on the surface of the shield machine reaction frame 1 by means of the installation bolt 10. Then, the high-strength cables 8 are inserted into the soil layer after passing through the pouring hole 11, and concrete is poured into the pouring hole 11 for sealing and reinforcement.

[0035] Embodiment 3

[0036] Refer to the appendix Figures 5 to 7 , on the basis of Embodiment 2, in order to buffer the vibration when fixing the high-strength cable 8 at the connection between the shield machine reaction frame 1 and the main tunnel segment 2, the buffer mechanism includes a support block 12, a reserved groove 13, a buffer block 14, a rubber gasket 15, a docking groove 16, a guide post 17, a spring 18 and a rubber traction post 19. The support block 12 is in the shape of an arc-shaped plate. There are two groups of support blocks 12, which are symmetrically distributed about the installation groove 6, and both groups of support blocks 12 are fixed on the outer ring surface of the shield machine reaction frame 1. The reserved groove 13 is opened on the surface of the support block 12. The width of the groove opening of the reserved groove 13 is smaller than the bottom width of the support block 12, and the reserved groove 13 penetrates through the support block 12. The buffer block 14 is in the shape of a square block. One end of the buffer block 14 extending towards the inner ring surface of the main tunnel segment 2 is an arc-shaped curved surface. The rubber gasket 15 is fixed on the arc-shaped curved surface, and the rubber gasket 15 abuts against the inner ring surface of the main tunnel segment 2. The buffer block 14 is movably inserted into the reserved groove 13. The docking groove 16 is opened at the other end of the buffer block 14. One end of the guide post 17 is movably inserted into the docking groove 16, and the other end of the guide post 17 is fixed on the outer ring surface of the shield machine reaction frame 1. The spring 18 is sleeved on the rod body of the guide post 17, and the spring 18 is fixed between the docking groove 16 and the outer ring surface of the shield machine reaction frame 1. There are multiple rubber traction posts 19, and the multiple rubber traction posts 19 are arranged around the spring 18, and all the multiple rubber traction posts 19 are fixed between the docking groove 16 and the outer ring surface of the shield machine reaction frame 1. A limiting component is arranged between the buffer block 14 and the outer ring surface of the shield machine reaction frame 1. The limiting component includes a chute 20, a slider 21, a traction plate 22 and a rubber clamping block 23. The chute 20 is opened on the surface of the buffer block 14. The slider 21 is slidably connected in the chute 20. The slider 21 is fixed at one end of the traction plate 22. The traction plate 22 is in the shape of an "L"-shaped plate. The other end of the traction plate 22 is fixed on the surface of the reserved groove 13. The rubber clamping block 23 is fixed between the other end of the traction plate 22 and the buffer block 14;

[0037] The rubber clamping block 23, the rubber traction post 19 and the spring 18 jointly support the buffer block 14, so that the rubber gasket 15 abuts against the inner ring surface of the main tunnel segment 2. The vibration generated when fixing the high-strength cable 8 causes the buffer block 14 to slide along the reserved groove 13. At this time, the rubber clamping block 23, the rubber traction post 19 and the spring 18 are squeezed and deformed, realizing the buffering of the vibration.

[0038] A construction method for the main tunnel support mechanism of a shield connection passage, the construction method comprising the following steps:

[0039] According to the on-site survey and its construction deployment situation, hoist the shield machine into the well from the established position, assemble and transport it to the entrance of the connection passage, and determine the direction in which the high-strength cable radiates outward, so as to determine the position where the high-strength cable is fixed on the shield reaction frame;

[0040] Fix the shield reaction frame at the segment in front of the entrance of the connection passage, and install an anti-shock spring outside the reaction frame to prevent damage to the tunnel segment when driving the high-strength cable. Using the shield reaction frame as a reaction device, drive the high-strength cable into the soil through the reserved hole on the main tunnel segment at the designed angle, and promptly grout the reserved hole to take waterproof measures to avoid water leakage;

[0041] Embed the cable driven into the soil into the position determined by the shield reaction frame and fix it with bolts;

[0042] Install the negative ring, and the shield machine is ready for tunneling construction. During the tunneling process of the shield machine, closely monitor the state of the high-strength cable, the reserved hole of the segment, and the segment behind the shield reaction frame. If abnormal elongation rate of the cable, cable fracture or water seepage in the reserved hole occurs, stop immediately, and check and handle it in time.

[0043] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A main tunnel support mechanism for a shield connection passage, comprising a shield reaction frame (1), the shield reaction frame (1) is installed in the main tunnel segment (2), and the main tunnel segment (2) is installed in the main tunnel of the shield connection passage, characterized in that: A reinforcement connecting member is provided between the reaction frame (1) of the shield machine and the main tunnel segment (2) for installing the reaction frame (1) of the shield machine in the inner ring opening of the main tunnel segment (2). The outer ring surface of the reaction frame (1) of the shield machine is provided with embedded installation parts for fixing one end of the high-strength cable (8). The other end of the high-strength cable (8) penetrates through the main tunnel segment (2) and then inserts into the soil layer. A buffer mechanism is installed on the outer ring surface of the reaction frame (1) of the shield machine to reduce the impact of the vibration generated during the installation of the high-strength cable (8) on the main tunnel segment (2). There are four groups of embedded installation parts. Each group of embedded installation parts and the cushion blocks (3) are distributed alternately on the outer ring surface of the reaction frame (1) of the shield machine. The embedded installation part includes an installation groove (6) and an embedded shaft (7). The installation groove (6) is a square groove, which is opened on the outer ring surface of the reaction frame (1) of the shield machine, and there are multiple installation grooves (6) arranged side by side. The embedded shaft (7) is fixed on two parallel side walls of the installation groove (6). One end of the high-strength cable (8) is bolted and fixed on the embedded shaft (7). One end of the high-strength cable (8) is sleeved and fixed with a flange plate (9), and the flange plate (9) is fixed on the outer ring surface of the reaction frame (1) of the shield machine through installation bolts (10).

2. The main tunnel support mechanism of a shield connection passage according to claim 1, wherein: The reaction frame (1) of the shield machine is in the structure of an octagonal ring plate. The inner ring opening of the reaction frame (1) of the shield machine is a circular opening. The outer ring surface of the reaction frame (1) of the shield machine is fixed with cushion blocks (3). The cushion blocks (3) are in the structure of circular arc plates. There are four groups of cushion blocks (3), and the four groups of cushion blocks (3) are arranged in a "cross" shape. There are four groups of reinforcement connecting members, and the four groups of reinforcement connecting members are distributed in a "cross" shape in the circular opening of the reaction frame (1) of the shield machine.

3. The main tunnel support mechanism for a shield connection passage according to claim 2, wherein: The reinforcement connecting member includes a reserved hole (4) and a strengthening bolt (5). The reserved hole (4) is opened in the circular opening of the reaction frame (1) of the shield machine. The reserved hole (4) is in the shape of a "T" - shaped opening, and the reserved hole (4) penetrates through the reaction frame (1) of the shield machine and the cushion block (3). The strengthening bolt (5) penetrates through the reserved hole (4) and is screwed on the inner ring surface of the main tunnel segment (2).

4. The main tunnel support mechanism of a shield connection passage according to claim 1, characterized in that: Pouring holes (11) are opened on the surface of the main tunnel segment (2). The pouring holes (11) correspond to the high-strength cables (8) one by one. The high-strength cables (8) penetrate through the pouring holes (11) and then insert into the soil layer.

5. The main tunnel support mechanism for a shield connection passage according to claim 1, characterized in that: The buffer mechanism includes a support block (12), a reserved groove (13), a buffer block (14), a rubber gasket (15), a docking groove (16), a guide post (17), a spring (18), and a rubber traction post (19). The support block (12) is in the structure of a circular arc plate. There are two groups of support blocks (12), and the two groups of support blocks (12) are symmetrically distributed with respect to the installation groove (6), and both groups of support blocks (12) are fixed on the outer ring surface of the reaction frame (1) of the shield machine. The reserved groove (13) is opened on the surface of the support block (12). The width of the groove opening of the reserved groove (13) is smaller than the bottom width of the support block (12), and the reserved groove (13) penetrates through the support block (12).

6. The main tunnel support mechanism for a shield connection passage according to claim 5, characterized in that: The buffer block (14) is in the shape of a square block. One end of the buffer block (14) extending towards the inner ring surface of the main tunnel segment (2) is a circular arc curved surface. The rubber gasket (15) is fixed on the circular arc curved surface. The rubber gasket (15) abuts against the inner ring surface of the main tunnel segment (2). The buffer block (14) is movably inserted into the reserved groove (13). The docking groove (16) is opened at the other end of the buffer block (14). One end of the guiding column (17) is movably inserted into the docking groove (16). The other end of the guiding column (17) is fixed on the outer ring surface of the shield machine reaction frame (1). The spring (18) is sleeved on the rod body of the guiding column (17), and the spring (18) is fixed between the docking groove (16) and the outer ring surface of the shield machine reaction frame (1).

7. A main tunnel support mechanism for a shield connection passage according to claim 5, characterized in that: A plurality of rubber traction columns (19) are provided. The plurality of rubber traction columns (19) are arranged around the spring (18), and the plurality of rubber traction columns (19) are all fixed between the docking groove (16) and the outer ring surface of the shield machine reaction frame (1). A limiting component is provided between the buffer block (14) and the outer ring surface of the shield machine reaction frame (1).

8. A main tunnel support mechanism for a shield connection passage according to claim 7, characterized in that: The limiting component includes a sliding groove (20), a sliding block (21), a traction plate (22) and a rubber clamping block (23). The sliding groove (20) is opened on the surface of the buffer block (14). The sliding block (21) is slidably connected in the sliding groove (20). The sliding block (21) is fixed at one end of the traction plate (22). The traction plate (22) is in an "L"-shaped plate structure. The other end of the traction plate (22) is fixed on the surface of the reserved groove (13). The rubber clamping block (23) is fixed between the other end of the traction plate (22) and the buffer block (14).

9. A construction method of the main tunnel support mechanism of the shield connection passage according to claim 8, characterized in that, The construction method includes the following steps: According to the on-site survey and its construction deployment situation, hoist the shield machine into the well from the established position, assemble and transport it to the connection tunnel portal, and determine the direction in which the high-strength cable radiates outwards, so as to determine the position where the high-strength cable is fixed on the shield machine reaction frame; Fix the shield machine reaction frame at the segment in front of the connection tunnel portal, and install an anti-shock spring outside the reaction frame to prevent damage to the tunnel segment when driving the high-strength cable. Using the shield machine reaction frame as a reaction device, drive the high-strength cable into the soil through the reserved hole on the main tunnel segment at the designed angle, and promptly grout the reserved hole to do a good job in waterproofing measures to avoid water leakage; Embed the cable driven into the soil into the position determined by the shield machine reaction frame and fix it with bolts; Install the negative ring, and the shield machine is ready for tunneling construction. During the tunneling process of the shield machine, closely monitor the state of the high-strength cable, the reserved hole of the segment, and the segment behind the shield machine reaction frame. If abnormal elongation rate of the cable, cable breakage or water seepage in the reserved hole occurs, stop immediately and check and handle it in time.

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