CN-115749853-B - Tunnel assembly type self-arching two-lining structure and construction method thereof

CN115749853BCN 115749853 BCN115749853 BCN 115749853BCN-115749853-B

Abstract

The invention relates to a tunnel assembled self-arching two-lining structure and a construction method thereof. The problems of high labor intensity, long construction period, horizontal mechanized construction and the like in the existing two-lining structure construction are solved. The double-lining structure comprises an inverted arch, concrete precast blocks and hollow steel structure block parts, wherein annular tensioning pore canals are formed in the inverted arch, the concrete precast blocks and the hollow steel structure block parts, tensioning ropes penetrate into the tensioning pore canals, the inverted arch, the concrete precast blocks and the hollow steel structure block parts form the double-lining structure in the annular direction under the traction action of the tensioning ropes, the hollow steel structure block parts are arranged at the top, the concrete precast blocks are arranged at the two sides, and the inverted arch is arranged at the bottom. The invention adopts the assembly type construction, the concrete precast block and the hollow steel structure block piece can be industrialized, the quality is more controllable, the mechanization level is high, and the tensioning ropes are penetrated into the concrete precast block and the hollow steel structure block piece in the assembly process and then tensioned, so that various components are circularly arched in a self-arching mode under the tensioning effect, and the construction speed is obviously improved.

Inventors

WANG ZUO
CAO XIAOYONG
GONG YITONG
XU PING

Assignees

中交第一公路勘察设计研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20221115

Claims (9)

1. The tunnel assembled is from two lining structures of arch, its characterized in that: the secondary lining structure comprises an inverted arch (6), a concrete precast block and a hollow steel structure block piece (4), wherein annular tensioning pore channels (8) are formed in the inverted arch (6), the concrete precast block and the hollow steel structure block piece (4); The inverted arch (6), the concrete precast block and the hollow steel structure block (4) are annularly formed into the two-lining structure under the traction action of the tensioning ropes (14), wherein in the two-lining structure, the hollow steel structure block (4) is positioned at the top, the concrete precast blocks are positioned at two sides, and the inverted arch (6) is positioned at the bottom; The hollow steel structure block (4) comprises two hollow steel boxes (11), wherein shaft holes (13) are formed in one end of each hollow steel box (11), the outline of the periphery of one end of each hollow steel box (11) with the shaft holes (13) is smaller than that of the other hollow steel box (11) with the shaft holes (13), one ends of the two hollow steel boxes (11) with the shaft holes (13) are inserted into each other, and the shaft holes (13) are correspondingly inserted into the rotary shafts (12).
2. The tunnel-fitting self-arching secondary structure of claim 1, wherein: the middle part of the inverted arch (6) is provided with a spacing gap for arranging a prestress tensioning device (7).
3. The tunnel-fitting self-arching secondary structure of claim 1, wherein: the concrete precast block comprises a first concrete precast block (2) and a second concrete precast block (3); The first concrete precast blocks (2) are positioned at the bottoms of the two sides and are connected with the inverted arch (6), one first concrete precast block (2) on each side is arranged, and the top of each first concrete precast block (2) is provided with an inserting groove (9) or an inserting tenon (10); The second concrete precast blocks (3) are positioned on two sides and between the hollow steel structure block piece (4) and the first concrete precast block (2), at least two second concrete precast blocks (3) are arranged on each side, and inserting grooves (9) or inserting tenons (10) are formed in the top and the bottom of each second concrete precast block (3); The first concrete precast blocks (2) and the adjacent second concrete precast blocks (3) are spliced with each other through corresponding splicing grooves (9) and splicing tenons (10).
4. A tunnel-fitting self-arching secondary structure as claimed in claim 3, wherein: the other end of the inner hollow steel box (11) provided with the shaft hole (13) is provided with a plug-in groove (9) or a plug-in tenon (10); the hollow steel box (11) and the adjacent second concrete precast blocks (3) are spliced with each other through corresponding splicing grooves (9) and splicing tenons (10).
5. The tunnel-fitting self-arching secondary structure of claim 1, wherein: the inner hollow steel box (11) is internally provided with a circumferential stretching pore canal (8), and the stretching pore canal (8) is positioned beside the shaft hole (13).
6. A tunnel-fitting self-arching secondary structure as claimed in claim 3, wherein: the inverted arch (6) is of a cast-in-situ structure.
7. The tunnel-fitting self-arching secondary structure of claim 6, wherein: The bottom surface profile of the inverted arch (6) is consistent with the inner side profile of the primary support (1), and the top surface of the inverted arch (6) is a plane; One end of the first concrete precast block (2) connected with the inverted arch (6) is a plane.
8. The construction method of the tunnel assembled self-arching two-lining structure is characterized by comprising the following steps of: The method comprises the following steps: Excavating a tunnel and performing primary support (1); pouring an inverted arch (6) and reserving a stretching pore canal (8) and a spacing vacancy; the concrete precast blocks and the hollow steel structure block pieces (4) are transported to a construction position through the movable trolley (5), and the concrete precast blocks and the hollow steel structure block pieces (4) are placed on the movable trolley (5) in sequence and penetrate into a tensioning rope (14); A prestress tensioning device (7) is arranged in the interval vacancy, a tensioning rope (14) is further penetrated in from the outer side of the inverted arch (6) and penetrates out from the inner side of the inverted arch, the prestressed tensioning device (7) is used for tensioning, and the inverted arch (6), the concrete precast block and the hollow steel structure block (4) form a two-lining structure in a circumferential mode under traction of the tensioning rope (14); Removing the prestress tensioning device (7) and performing cyclic construction; and a gap at which the prestress tensioning device (7) is positioned is used as a central drainage ditch of the tunnel.
9. The method for constructing the tunnel-assembled self-arching double-lining structure according to claim 8, wherein the method comprises the following steps: After the inverted arch (6), the concrete precast block and the hollow steel structure block (4) form the two-lining structure in a circumferential mode, wall thickness grouting is conducted through the reserved holes (18).

Description

Tunnel assembly type self-arching two-lining structure and construction method thereof Technical Field The invention relates to the technical field of tunnel engineering construction, in particular to a tunnel assembled self-arching two-lining structure and a construction method thereof. Background When the road tunnel structure system is designed and constructed according to the new Otto principle, the structure system mainly comprises an initial support and a secondary lining, wherein the initial support consists of anchor rods, sprayed concrete, steel arches and the like, the secondary lining adopts molded concrete or reinforced concrete, and geotextile and waterproof plates are laid between the initial support and the secondary lining. In combination with tunnel construction practice, when the secondary lining of the highway tunnel is constructed by adopting the molded concrete or the reinforced concrete, the construction needs to be subjected to various working procedures such as formwork supporting, concrete pouring, formwork removing maintenance and the like, the labor intensity of workers in the construction process is high, the secondary lining maintenance period time is long, and the mechanized construction level is low. In addition, considering highway tunnel excavation construction mechanical characteristics, the support part and the tunnel support system are applied as early as possible in the tunnel construction process and are sealed into a ring as early as possible, so that the settlement of the tunnel vault and the peripheral convergence can be obviously and effectively controlled. Therefore, a secondary lining construction technology with high mechanized construction level and capable of effectively reducing the labor intensity of construction workers, shortening the construction period, accelerating the construction speed and improving the deformation control capability of tunnel construction is required to be provided for new Ottoman construction. Disclosure of Invention The invention aims to provide a tunnel assembled self-arching two-lining structure and a construction method thereof, which at least solve the problems of high labor intensity, long construction period, horizontal mechanized construction and the like in the conventional two-lining structure construction. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the tunnel assembly type self-arching secondary lining structure comprises an inverted arch, a concrete precast block and a hollow steel structure block piece, wherein annular tensioning pore canals are formed in the inverted arch, the concrete precast block and the hollow steel structure block piece; The inverted arch, the concrete precast block and the hollow steel structure block piece are annularly formed into a two-lining structure under the traction action of the tensioning ropes, wherein in the two-lining structure, the hollow steel structure block piece is positioned at the top, the concrete precast block is positioned at two sides, and the inverted arch is positioned at the bottom. Further, a space vacancy for arranging the prestress tensioning device is arranged in the middle of the inverted arch. Further, the concrete precast blocks comprise a first concrete precast block and a second concrete precast block; the first concrete precast blocks are positioned at the bottoms of the two sides and are connected with the inverted arch, one first concrete precast block is arranged on each side, and the top of each first concrete precast block is provided with an inserting groove or an inserting tenon; the second concrete precast blocks are positioned on two sides and between the hollow steel structure block piece and the first concrete precast block, at least two second concrete precast blocks are arranged on each side, and the top and the bottom of each second concrete precast block are provided with splicing grooves or splicing tenons; the first concrete precast blocks and the adjacent second concrete precast blocks are spliced with each other through corresponding splicing grooves and splicing tenons. Further, the hollow steel structure block piece comprises two hollow steel boxes, and one end of each hollow steel box is provided with a shaft hole; One of the inner hollow steel boxes is provided with one end of the shaft hole, the peripheral outline of the end is smaller than that of the other inner hollow steel box, the two inner hollow steel boxes are provided with one end of the shaft hole, the two inner hollow steel boxes are inserted into each other, and the shaft hole is inserted into the rotating shaft after corresponding to the inner hollow steel box. Further, the other end of the shaft hole of the hollow steel box is provided with a splicing groove or a splicing tenon; The hollow steel box and the adjacent second concrete precast blocks are spliced with each other through corresponding splicing grooves and s