TBM segment anti-cracking structure for soft surrounding rock hydraulic tunnel

Abstract

The utility model discloses a kind of TBM segment crack resistance structure for soft weak surrounding rock hydraulic tunnel, it is related to hydraulic tunnel segment technical field, the utility model includes the transverse self top-down setting several hoop stress reinforcement, the vertical set in the surface of hoop stress reinforcement several longitudinal stress reinforcement, longitudinal oblique setting in the edge of the two sides of hoop stress reinforcement tie bar, the vertical direction left and right sides of inner arc surface formed along several hoop stress reinforcement are provided with screw-threaded steel bars, the left and right sides of screw-threaded steel bars are symmetrically provided with several radial bars, the utility model is arranged on the contact surface of TBM machine auxiliary push oil cylinder piston rod shoe plate and segment steel reinforcement framework structure thrust stress point longitudinal stress reinforcement and radial bar, increase the longitudinal supporting force of segment steel reinforcement framework structure, ensure that TBM machine is in single shield mode tunneling, installed segment is not easy to break.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic tunnel segment technology, and in particular to a TBM segment anti-crack structure for hydraulic tunnels with weak surrounding rock. Background Technology

[0002] Tunnel boring machines (TBMs) are core equipment for intelligent hydraulic tunnel construction. They offer high construction speed and comprehensive benefits. When lining segments in relatively soft surrounding rock, TBMs use a single-shield method to line "C"-shaped segments. However, in single-shield mode, the TBM's hydraulic cylinders fully retract, the telescopic shield closes, and the thrust is provided by the auxiliary cylinders. The thrust of the TBM's auxiliary thrust cylinder piston rod shoe plate cannot act on the rock wall. Instead, the thrust acts entirely on the longitudinal end face of the existing segments. The existing steel reinforcement structure of the segments is insufficient to support the thrust of the TBM's auxiliary thrust cylinder piston rod shoe plate. This makes it extremely easy for cracks to appear in the cast segments during TBM single-shield tunneling. Cracks in the segments will damage the stability, durability, and impermeability of the internal structure of the hydraulic tunnel, seriously affecting its use. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a crack-resistant structure for TBM segments used in hydraulic tunnels with weak surrounding rock, which solves the technical problem that the existing steel reinforcement skeleton structure of segments is unable to support the thrust of the piston rod shoe plate of the TBM auxiliary thrust cylinder.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A TBM segment anti-crack structure for hydraulic tunnels in weak surrounding rock includes several circumferential reinforcing bars arranged transversely from top to bottom, several longitudinal reinforcing bars vertically sleeved on the surface of the circumferential reinforcing bars, and longitudinal tie bars inclined at the edges on both sides of the circumferential reinforcing bars. Threaded steel bars are arranged on the left and right sides in the vertical direction of the inner arc surface formed by the several circumferential reinforcing bars, and several radial bars are symmetrically arranged on the left and right sides of the threaded steel bars.

[0005] Furthermore, the circumferential reinforcing bar is composed of an inner circumferential reinforcing bar and an outer circumferential reinforcing bar. The two ends of the inner and outer circumferential reinforcing bars are bent and fixed by overlapping or intersecting to form a fan-shaped ring.

[0006] Furthermore, positioning steel bars are symmetrically fixed on both sides of the circumferential reinforcing bars placed at the upper and lower parts.

[0007] Furthermore, the longitudinal force is applied between the radial ribs on the left and right sides.

[0008] Furthermore, the radial ribs are respectively arranged on the inner side of the outer circumferential reinforcing rib and the inner circumferential reinforcing rib, and the radial ribs are fixed together by tie rods.

[0009] Furthermore, the outer and inner circumferential reinforcing bars of the upper and lower circumferential reinforcing bars are connected by stirrups.

[0010] Furthermore, the longitudinal reinforcing bar is a rectangular frame formed by bending a single bar and lapping and fixing its two ends together.

[0011] Furthermore, the tie rods are connected by stirrups.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. Add longitudinal reinforcing bars to the contact surface between the segment structure and the piston rod shoe plate of the TBM auxiliary thrust cylinder to increase the support strength of the longitudinal end face of the segment steel reinforcement skeleton structure, thereby solving the technical problem that the existing segment steel reinforcement skeleton structure is difficult to support the thrust of the TBM auxiliary thrust cylinder piston rod shoe plate.

[0013] 2. Radial reinforcement is provided on the inner side of the outer and inner circumferential reinforcement of the segment structure. The radial reinforcement disperses stress, restrains concrete deformation, and further strengthens the load-bearing capacity of the segment reinforcement skeleton structure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the segment of the present invention; Figure 2 for Figure 1 Schematic diagram of the side structure within area A in the middle; Figure 3 for Figure 1 BB section view; Figure 4 This is a plan view of the lap splice of the circumferential reinforcing bars; Figure 5 This is a plan view of the lap splice of the longitudinal reinforcing bars.

[0015] In the picture: 1. Positioning reinforcement; 2. Threaded reinforcement; 3. Outer circumferential reinforcement; 4. Inner circumferential reinforcement; 5. Tie bars; 6. Longitudinal reinforcement; 7. Circumferential reinforcement; 8. Radial reinforcement; 9. Stirrups. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0017] like Figure 1-5As shown, a crack-resistant structure for TBM segments used in hydraulic tunnels with weak surrounding rock includes several circumferential reinforcing bars 7 arranged transversely from top to bottom, several longitudinal reinforcing bars 6 vertically sleeved on the surface of the circumferential reinforcing bars 7, and tie bars 5 longitudinally inclined at the edges of the circumferential reinforcing bars 7 to increase the support force of the longitudinal surface. The tie bars 5 are used to fix the circumferential reinforcing bars 7. Threaded steel bars 2 are arranged on the left and right sides along the vertical direction of the inner arc surface formed by the several circumferential reinforcing bars 7. Several radial bars 8 are symmetrically arranged on the left and right sides of the threaded steel bars 2 to further enhance the bearing capacity of the segment steel reinforcement skeleton structure.

[0018] The circumferential reinforcing rib 7 is composed of an inner circumferential reinforcing rib 4 and an outer circumferential reinforcing rib 3. The two ends of the inner circumferential reinforcing rib 4 and the outer circumferential reinforcing rib 3 are bent and fixed by overlapping or intersecting to form a fan-shaped ring. The fan-shaped ring is consistent with the outer shape of the tube segment.

[0019] Positioning steel bars 1 are symmetrically fixed on the left and right sides of the circumferential reinforcing bars 7 placed at the upper and lower parts.

[0020] The longitudinal reinforcing bars 6 are arranged between the radial reinforcing bars 8 on the left and right sides, and the longitudinal reinforcing bars 6 increase the longitudinal end face support strength of the segment steel reinforcement skeleton structure.

[0021] The radial reinforcement 8 is respectively set on the inner side of the outer circumferential reinforcement 3 and the inner circumferential reinforcement 4, and the radial reinforcement 8 is fixed with tie bars 5 to further enhance the bearing capacity of the segment reinforcement skeleton structure.

[0022] The outer circumferential reinforcing bars 3 and the inner circumferential reinforcing bars 4 of the upper and lower circumferential reinforcing bars 7 are connected by stirrups 9.

[0023] The longitudinal reinforcing bar 6 is a rectangular frame formed by bending a single bar and lapping and fixing the two ends together.

[0024] The tie rod 5 is connected by the stirrup 9.

[0025] When using it, the following steps are included: S1. After bending the two ends of the inner circumferential reinforcing bar 4 and the outer circumferential reinforcing bar 3, the circumferential reinforcing bar 7 is formed by lapping or intersecting. The longitudinal inclined tie bar fixes the circumferential reinforcing bar 7. S2. Fix the positioning steel bar 1 to the first and last circumferential reinforcing bars. The positioning steel bar 1 used is a spiral bar. The spiral bar is fitted with a positioning pin inside. Then, install the threaded steel bar 2 on the left and right sides along the vertical direction of the inner arc surface formed by the circumferential reinforcing bars 7. S3. The radial reinforcement bars are symmetrically installed on the left and right sides of the threaded steel bar 2, inside the outer circumferential reinforcement bar 3 and the inner circumferential reinforcement bar 4, and the radial reinforcement bars 8 are fixed with tie bars 5. S4. Connect the outer circumferential reinforcing bars 3 and the inner circumferential reinforcing bars 4 of the first and last circumferential reinforcing bars 7 with stirrups 9, and connect the various tie bars 5 with stirrups 9. S5. After bending a single bar, lap and fix the two ends to form a longitudinal reinforcing bar 6. Finally, vertically fit the longitudinal reinforcing bar 6 onto the surface of the circumferential reinforcing bar 7 between the radial reinforcing bars 8 on the left and right sides. S6. After completing the steel reinforcement skeleton structure of the pipe segment according to the above steps, the pipe segment is formed after the final pouring process. When assembling the pipe segment, the TBM machine positions the different pipe segments according to the positioning pins at the positioning steel bars. After the pipe segments are positioned, they are fixed with bolts to complete the assembly of the different pipe segments.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A TBM segment anti-crack structure for hydraulic tunnels in weak surrounding rock, characterized in that: It includes several circumferential reinforcing bars (7) arranged horizontally from top to bottom, several longitudinal reinforcing bars (6) vertically sleeved on the surface of the circumferential reinforcing bars (7), and tie bars (5) arranged longitudinally at the edges of the circumferential reinforcing bars (7). Threaded steel bars (2) are arranged on the left and right sides in the vertical direction of the inner arc surface formed by the several circumferential reinforcing bars (7). Several radial bars (8) are symmetrically arranged on the left and right sides of the threaded steel bars (2).

2. The TBM segment crack-resistant structure for hydraulic tunnels in weak surrounding rock as described in claim 1, characterized in that: The circumferential reinforcing bar (7) is composed of an inner circumferential reinforcing bar (4) and an outer circumferential reinforcing bar (3). The two ends of the inner circumferential reinforcing bar (4) and the outer circumferential reinforcing bar (3) are bent and fixed by overlapping or intersecting to form a fan-shaped ring.

3. The TBM segment anti-crack structure for hydraulic tunnels in weak surrounding rock as described in claim 2, characterized in that: Positioning steel bars (1) are symmetrically fixed on the left and right sides of the circumferential reinforcing bars (7) placed at the upper and lower parts.

4. The TBM segment crack-resistant structure for hydraulic tunnels in weak surrounding rock as described in claim 3, characterized in that: The longitudinal reinforcing bars (6) are arranged between the radial reinforcing bars (8) on the left and right sides.

5. The TBM segment crack-resistant structure for hydraulic tunnels in weak surrounding rock as described in claim 4, characterized in that: The radial ribs (8) are respectively arranged on the inner side of the outer circumferential reinforcing ribs (3) and the inner circumferential reinforcing ribs (4), and the radial ribs (8) are fixed together by tie rods (5).

6. The TBM segment anti-crack structure for hydraulic tunnels in weak surrounding rock as described in claim 5, characterized in that: The outer circumferential reinforcing bars (3) and inner circumferential reinforcing bars (4) of the upper and lower circumferential reinforcing bars (7) are connected by stirrups (9).

7. The TBM segment crack-resistant structure for hydraulic tunnels in weak surrounding rock as described in claim 6, characterized in that: The longitudinal reinforcing bar (6) is a rectangular frame formed by bending a single bar and lapping and fixing the two ends together.

8. The TBM segment crack-resistant structure for hydraulic tunnels in weak surrounding rock as described in claim 7, characterized in that: The tie rod (5) is connected by the stirrup (9).

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