CN-224228688-U - Receiving section variable cross-section reinforcing protection structure for shield-mining tunnel butt joint

Abstract

The utility model discloses a receiving section variable cross-section reinforcing protection structure for butt joint of a shield-mine tunnel, which comprises a cavity, a shield tunnel, a transitional gradual change reinforcing body and a baffle wall, wherein the cavity is in radial butt joint with the shield tunnel, the vault of the cavity is about 4m higher than that of the shield tunnel, the transitional gradual change reinforcing body is formed by adopting a sectional back-to-back type wall deep hole grouting process, the circumferential spacing of grouting holes is 2-2.5m, the row spacing is 1-ring segment, slurry adopts cement-water glass double-liquid slurry, the reinforcing length is 10-15-ring segment, the thickness is gradually reduced from the cavity to the tunnel direction, a C35 reinforced concrete baffle wall with the thickness of 50cm is arranged at the joint of the cavity and the tunnel lining, the baffle wall is welded with the end face of the receiving ring segment and poured into a whole, the length of the pipe extending into the baffle wall is controlled to be less than or equal to 20cm, and a 2cm wide deformation joint and a double water stop belt (back-to-paste type + annular embedded steel edge type) are arranged between the baffle wall and the cavity, so that the problems of stress concentration, leakage and sedimentation at the variable cross-section of the receiving section are effectively solved by arranging the transitional gradual change reinforcing body and the baffle wall.

Inventors

• ZHANG TING
• SHI YEFENG
• LI JIAN
• YANG PING
• LI HUANHUAN
• Qiu Tingtao
• WANG JIAHUI
• GUO RUIJIAO

Assignees

• 南京林业大学
• 中交隧道工程局有限公司

Dates

Publication Date

20260512

Application Date

20250615

Claims (6)

1. 1. The utility model provides a receive section variable cross section reinforcement protection architecture for shield-mine method tunnel butt joint, includes cavern (1), shield tunnel (2), transition gradual change adds solid (5), keeps off first wall (6), its characterized in that, the radial butt joint of cavern (1) and shield tunnel (2), the horseshoe section of cavern (1) is connected at receive section variable cross section with the circular section of shield tunnel (2), and cavern (1) vault is higher than shield tunnel (2) about 4m, and transition gradual change adds solid (5) around shield tunnel (2) setting.
2. 2. The receiving section variable cross-section reinforcing protection structure for butt joint of a shield-mining tunnel according to claim 1, wherein the transition gradual change reinforcing body (5) is formed by reserving annular grouting holes (4) in a duct piece (3) through a segmented back-type wall back-deep hole grouting process, the circumferential spacing of the grouting holes is 2-2.5m, the row spacing is 1-ring duct piece, slurry adopts cement-water glass double-liquid slurry, the length range of the transition gradual change reinforcing body (5) is 10-15-ring duct pieces outside a cavity (1), the thickness of the transition gradual change reinforcing body is gradually reduced from the cavity (1) to the shield tunnel (2), and gradual change release of stratum stress is realized when the stratum stress passes through the reinforcing body.
3. 3. The receiving section variable cross-section reinforcing protection structure for butt joint of a shield-mining tunnel according to claim 1, wherein the retaining wall (6) is arranged at the joint of a cavity lining (8) and the shield tunnel lining, the retaining wall (6) is 50cm thick and made of C35 reinforced concrete, the upright surface of the retaining wall is protected by anchor net spraying, 23cm thick C25 concrete is sprayed, A6 reinforced meshes are adopted, the distance is 25 multiplied by 25cm, 3m long mortar anchor rods (7) are arranged, and the distance is 1.0 multiplied by 1.0m.
4. 4. The receiving section variable cross-section reinforcing protection structure for butt joint of a shield-mining tunnel according to claim 1, wherein a back-attached rubber water stop (10) and a circumferential buried steel edge rubber water stop (11) are arranged at the connecting end of the blocking wall (6) and the grotto (1), and a waterproof plate (9) of the blocking wall (6) is integrally connected with the waterproof plate (9) of the grotto (1).
5. 5. The receiving section variable cross-section reinforcing and protecting structure for butt joint of shield-mining tunnel according to claim 1, wherein a deformation joint (12) is arranged at the joint of the blocking wall (6) and the lining of the cavity (1), and the width is 2cm.
6. 6. The receiving section variable cross-section reinforcing protection structure for butt joint of a shield-mining tunnel according to claim 1, wherein the end face of the baffle wall (6) and the end face of the receiving ring segment (3) are welded by adopting HRB400 steel bars and poured into a whole, the length of the segment (3) entering the thickness range of the baffle wall (6) is controlled to be not more than 20cm, if the length of the segment (3) entering the baffle wall (6) exceeds 20cm, the ring segment (3) can be reduced, and the cast-in-situ segment of the baffle wall (6) can be extended to the shield tunnel (2) section.

Description

Receiving section variable cross-section reinforcing protection structure for shield-mining tunnel butt joint Technical Field The utility model relates to the technical field of shield tunnel construction, in particular to a variable cross-section reinforcing protection structure of a receiving section for shield-mine tunnel butt joint. Background In tunnel construction, a single tunneling method is generally unable to adapt to the changing conditions of various geological conditions. The tunnel can be penetrated bidirectionally by a shield method and a mining method, so that the capability of crossing a variable stratum in the tunnel construction process can be improved, but the settlement control problem caused by the difference of different construction methods exists. In addition, the tunnel butt joint construction needs to be expanded and excavated in a receiving section of a tunnel by a mining method so as to reserve a construction space for receiving and hanging and dismantling the shield machine, and the butt joint area is easy to generate uncoordinated deformation due to the difference of structural materials, construction time sequence and section forms, so that the formation is unevenly settled. In order to realize the receiving in the ground of the shield machine, the mine tunnel needs to adopt an expanded section to meet the requirement of shield receiving space, but the shield machine cannot form a gradual change type reinforcing body due to synchronous grouting of the shield machine in the process that the shield machine enters the mine receiving section, so that the problem of stress concentration exists at the abrupt change position of the section of the receiving cavity and the shield tunnel, and the stratum instability risk is aggravated. In the prior art, full-section grouting is mostly adopted, so that the problem of gradual stiffness transition of a variable-section cannot be effectively solved, and dynamic load during penetration of a shield machine is easy to induce collapse of a reinforced weak area. Therefore, sufficient reinforcing protection measures are needed to be applied to the variable section, so that the safe receiving of the shield machine is ensured, and the influence on the surrounding environment is reduced. Disclosure of utility model The utility model aims to solve the defects in the prior art, and provides a receiving section variable cross-section reinforcing protection structure for shield-mine tunnel butt joint, which can effectively reduce the problem of stress concentration at a section abrupt change position and the risk of uneven settlement of stratum and ensure safe receiving of a shield machine. In order to achieve the above purpose, the present utility model adopts the following technical scheme: A receiving section variable cross-section reinforcing protection structure for butt joint of a shield-mine tunnel comprises a cavity, a shield tunnel, a transition gradual change reinforcing body and a blocking head wall. The tunnel chamber is radially butted with the shield tunnel, the horseshoe-shaped section of the tunnel chamber is connected with the circular section of the shield tunnel in a variable section mode, the vault of the tunnel chamber is about 4m higher than the shield tunnel, and the transitional gradual change reinforcing body is arranged around the shield tunnel. Preferably, the transition gradual change reinforcing body is formed by reserving annular grouting holes in the pipe piece and adopting a sectional back-down type wall back-deep hole grouting process, the circumferential spacing of the grouting holes is 2-2.5m, the row spacing is 1-ring pipe piece, the slurry adopts cement-water glass double-slurry, the length range of the transition gradual change reinforcing body is 10-15 rings of pipe pieces outside a cavity, the thickness is gradually reduced from the cavity to the shield tunnel direction, and gradual change release is realized when stratum stress passes through the reinforcing body. Preferably, the blocking wall is arranged at the joint of the tunnel lining and the shield tunnel lining, the blocking wall is 50cm thick and is made of C35 reinforced concrete, the upright surface of the blocking wall adopts an anchor net for spraying protection, C25 concrete with the thickness of 23cm is sprayed, A6 reinforced meshes are adopted, the distance is 25 multiplied by 25cm, 3m long mortar anchor rods are arranged, and the distance is 1.0 multiplied by 1.0m. Preferably, the connection end of the retaining wall and the cavity is provided with a back-attached rubber water stop and a circumferential buried steel edge rubber water stop, and the retaining wall waterproof plate and the cavity waterproof plate are connected into a whole. Preferably, a deformation joint is arranged at the joint of the blocking head wall and the lining of the cavity, and the width of the deformation joint is 2cm. Preferably, the end faces of the baffle wall lining a