CN-116877138-B - Karst tunnel surrounding rock-based reinforcement device and reinforcement method thereof

CN116877138BCN 116877138 BCN116877138 BCN 116877138BCN-116877138-B

Abstract

The invention belongs to the technical field of tunnel construction. The invention discloses a karst tunnel surrounding rock-based reinforcing device and a karst tunnel surrounding rock-based reinforcing method, wherein the karst tunnel surrounding rock-based reinforcing device comprises at least one pair of outer supporting pieces, the outer walls of the outer supporting pieces are fixed with tunnel top surrounding rock, the inner walls of the two outer supporting pieces are fixedly provided with two end parts of top supporting plates, an inner supporting piece is arranged on the inner walls of the top supporting plates and is positioned at the joint of the two adjacent top supporting plates, the inner supporting piece penetrates through the top supporting plates and the outer supporting pieces to be fixed with the tunnel top surrounding rock, a side wall reinforcing piece comprises supporting piles and side supporting plates, the side walls of the side supporting plates, the end parts of the inner supporting pieces and the end parts of the outer supporting pieces are fixedly poured in the supporting piles, the outer supporting pieces are outer arc-shaped ribs, a plurality of first anchor rods penetrate through the outer arc-shaped ribs to extend into the tunnel top surrounding rock, and the second anchor rod ends penetrate through the inner arc-shaped ribs, the top supporting plates and the outer arc-shaped ribs to extend into the tunnel top surrounding rock. The invention can realize simple construction and improve the construction efficiency of the tunnel on the basis of ensuring the supporting effect.

Inventors

LUO JUNHUI
WANG SHIHAI
ZHOU XIANG
JIANG YAJUN
SUN PENGLEI
LIU YAOFENG
CHANG ZHENCHAO
CHEN DEQIANG
HUANG HAIFENG
MO PENG

Assignees

广西北投交通养护科技集团有限公司

Dates

Publication Date: 20260505
Application Date: 20230802

Claims (5)

1. Karst tunnel surrounding rock-based reinforcing device is characterized by comprising: at least one pair of outer supporting pieces, wherein the outer walls of the outer supporting pieces are fixed with surrounding rocks at the top of the tunnel, and the inner walls of the two outer supporting pieces are fixed with two end parts of a top supporting plate (1); The inner supporting pieces are arranged on the inner walls of the top supporting plates (1) and are positioned at the joint of two adjacent top supporting plates (1), and the inner supporting pieces penetrate through the top supporting plates (1) and the outer supporting pieces to be fixed with surrounding rocks at the top of the tunnel; The side wall reinforcement comprises a support pile (2) and a side support plate (3), wherein the side wall of the side support plate (3), the end part of the inner support piece and the end part of the outer support piece are all poured and fixed in the support pile (2); The outer support piece is an outer arc rib (4), the two outer arc ribs (4) are respectively positioned at two ends of the top support plate (1), a plurality of first anchor rods (5) are fixedly arranged on the top support plate (1) in a penetrating mode, and the tail ends of the first anchor rods (5) penetrate through the outer arc ribs (4) and extend into surrounding rocks at the top of the tunnel; The inner supporting piece is an inner arc rib (6), one inner arc rib (6) is used for supporting the end parts of two adjacent top supporting plates (1), a plurality of second anchor rods (7) penetrate through the inner arc rib (6), the top supporting plates (1) and the outer arc rib (4) and extend into surrounding rocks at the top of the tunnel, and the tail ends of the second anchor rods (7) penetrate through the inner arc rib (6); the first anchor rods (5) and the second anchor rods (7) are arranged in a staggered mode; The side support plate (3) comprises a plate body (301), wherein protrusions (302) are fixedly connected to two ends of the plate body (301), the bottom of the support pile (2) is fixedly poured with a foundation, a penetrating groove (11) is formed in the support pile (2), the protrusions (302) extend into the penetrating groove (11), and the protrusions (302) are used for blocking the side walls of the penetrating groove (11); The inner wall of the end part of the outer arc rib (4) and the outer wall of the end part of the inner arc rib (6) are fixedly connected with pouring connecting plates (12) respectively, the end face of the outer arc rib (4) and the end face of the inner arc rib (6) are in contact with the top end of the supporting pile (2), and the pouring connecting plates (12) extend into the penetrating grooves (11).
2. The karst tunnel surrounding rock-based reinforcing device according to claim 1, wherein the top supporting plate (1) comprises a top plate (101) and side plates (102) arranged on two sides of the top plate (101), mounting grooves (103) are formed in two ends of the top plate (101) on one side far away from the inner supporting piece, and mounting plates (104) matched with the mounting grooves (103) are fixed on the ends, close to the top plate (101), of the side plates (102).
3. The karst tunnel surrounding rock reinforcing device based on claim 2, wherein reinforcing ribs (8) are arranged between two adjacent inner arc-shaped ribs (6), connecting bases (9) are fixedly connected to the inner walls of the inner arc-shaped ribs (6), connecting bolts (10) are arranged at one ends, far away from the reinforcing ribs (8), of the connecting bases (9), threaded holes matched with the connecting bolts (10) are formed in the connecting bases (9) and the reinforcing ribs (8), threaded ends of the connecting bolts (10) penetrate through the connecting bases (9) and extend into the reinforcing ribs (8) to be fixedly connected with the reinforcing ribs (8), and the reinforcing ribs (8) are used for supporting the connecting positions of the top plates (101) and the side plates (102).
4. The karst tunnel surrounding rock-based reinforcing device according to claim 1, wherein grouting holes (13) are formed in the inner wall of the supporting piles (2), and the grouting holes (13) are communicated with the penetrating grooves (11).
5. The karst tunnel surrounding rock-based reinforcement method according to claim 1, characterized in that the construction steps include: s1, constructing a supporting pile (2) to a karst tunnel; S2, installing a side supporting plate (3) between the two supporting piles (2); S3, installing an outer support piece on the top of the karst tunnel, sending the end part of the outer support piece into a support pile (2), and fixing a top support plate (1) on the inner wall of the outer support piece; S4, fixing an inner support piece to the inner wall of the top support plate (1), and feeding the end part of the inner support piece into the support pile (2); S5, pouring concrete into the support piles (2).

Description

Karst tunnel surrounding rock-based reinforcement device and reinforcement method thereof Technical Field The invention belongs to the technical field of tunnel construction, and particularly relates to a surrounding rock reinforcing device and method based on karst tunnels. Background In areas where limestone is widely distributed, a large number of hidden karst cave exist, the possibility of encountering the karst cave in tunnel excavation is high, and tunnel engineering such as roads, railways and the like sometimes inevitably needs to pass through karst strata in the process of infrastructure construction, and the tunnel is called a karst tunnel. For karst tunnel, in order to guarantee the security performance of karst tunnel, need carry out concrete lining to karst tunnel country rock, and before carrying out concrete lining, need adopt reinforcing apparatus to carry out reinforcement to the country rock. Among the prior art, the publication number is CN113123812A, and the patent name is a reinforcement device's for karst tunnel country rock patent, and it discloses reinforcement subassembly detachable connection in proper order together, and the braced connection seat is as whole device's braced frame, plays main supporting role, consolidates the lateral wall country rock of karst tunnel to reinforcement curb plate subassembly, consolidates roof subassembly and consolidates the arch position country rock of karst tunnel, makes the country rock of each position of karst tunnel all obtain the reinforcement, has improved reinforcement device's reinforcement stability and tunnel construction's security. However, the construction structure is complex and inconvenient to construct. The patent with the publication number of CN113775359A discloses a reinforcement structure and a method for a highway tunnel to penetrate through karst poor geology primary support, which also comprise a plurality of I-steel arches arranged at intervals, a plurality of locking nodes, wherein the locking rods are transversely arranged and adjacent to the I-steel arches, the locking nodes are sleeved on the locking rods and fixedly connected with the locking rods, and the locking nodes are respectively and fixedly connected with the I-steel arches, so that the reinforcement structure has the effect of improving the structural strength of the primary support structure. Although this structure improves the structural strength of the primary support structure, it is also inconvenient to construct. Therefore, the karst tunnel surrounding rock-based reinforcing device and the karst tunnel surrounding rock-based reinforcing method are provided, and the construction is convenient and the construction efficiency is improved on the basis of guaranteeing the supporting effect. Disclosure of Invention In order to solve the technical problems, the invention provides a karst tunnel surrounding rock-based reinforcing device and a reinforcing method thereof, which can be applied to reinforcing the karst tunnel surrounding rock and used as a permanent device, and the inner supporting piece and the outer supporting piece are matched, the top support plate is fixed while supporting the surrounding rock at the top of the tunnel, so that the top support plate supports the surrounding rock at the top, the construction is simple, and the construction efficiency of the tunnel can be improved on the basis of guaranteeing the supporting effect. In order to achieve the above object, the present invention provides a karst tunnel surrounding rock-based reinforcing device, comprising: At least one pair of outer supporting pieces, wherein the outer walls of the outer supporting pieces are fixed with surrounding rocks at the top of the tunnel, and the inner walls of the two outer supporting pieces are fixed with two end parts of a top supporting plate; The inner supporting piece is arranged on the inner wall of the top supporting plate and positioned at the joint of two adjacent top supporting plates, and penetrates through the top supporting plate and the outer supporting piece to be fixed with surrounding rock at the top of the tunnel; The side wall reinforcement comprises a support pile and a side support plate, wherein the side wall of the side support plate, the end part of the inner support piece and the end part of the outer support piece are all poured and fixed in the support pile. Further, the outer support piece is an outer arc rib, the two outer arc ribs are respectively located at two end parts of the top support plate, a plurality of first anchor rods penetrate through and are fixed on the top support plate, and the tail ends of the first anchor rods penetrate through the outer arc ribs and extend into surrounding rocks at the top of the tunnel. Further, the inner supporting piece is an inner arc rib, one inner arc rib is used for supporting the end parts of two adjacent top supporting plates, a plurality of second anchor rods penetrate through the