CN104314588A - Strengthening method for arranging support inside shield tunnel - Google Patents

Abstract

The invention relates to a reinforcement method for setting supports inside a shield tunnel. A steel ring is placed close to the inner wall of the segment at the joint of each ring segment of the shield tunnel to be reinforced; The four positions of upper, lower, left and right are provided with full-length I-steel along the longitudinal direction of the tunnel; horizontal I-steel supports and vertical I-steel supports are erected at the steel ring, and horizontal I-steel supports and vertical The two ends of the I-steel support in the direction are respectively fixed in the steel ring through the I-steel; the I-steel support in the horizontal direction and the I-steel support in the vertical direction are fixedly connected at the intersection. This reinforcement method can form a complete hoop and longitudinal support structure in the shield tunnel, so that the assembled structure of the shield tunnel has sufficient hoop and longitudinal stiffness and strength under the action of support. The safety of the tunnel is ensured when the load conditions around the road change.

Description

A reinforcement method for setting support inside a shield tunnel

technical field

The invention relates to the technical field of underground construction engineering, in particular to a reinforcement method for setting supports inside a shield tunnel.

Background technique

The shield tunneling method has the advantages of fast construction speed, high engineering quality, and good construction safety. It is more and more widely used in tunnel projects such as subway interval tunnels, highway tunnels, hydraulic tunnels, and urban underground pipe galleries. In the shield tunneling project, the stress conditions of the tunnel often change. For example, the position of the tunnel increases the ground load due to factors such as piled loads and heavy-duty vehicles, so that the ground pressure of the shield tunnel changes. ; Near the tunnel, there are foundation pit excavation, piling, strata high-pressure grouting, rotary grouting and other underground engineering constructions, which break the stress-strain balance of the stratum where the tunnel is located and cause the tunnel to deform. This situation exists in large quantities in the construction of underground engineering. Once the impact of adjacent projects on the shield tunnel exceeds the bearing capacity of the shield tunnel structure, it is bound to cause a large deformation of the shield tunnel, thereby causing damage to the tunnel. Therefore, in this case, it is necessary to reinforce the shield tunnel.

Contents of the invention

The purpose of the present invention is to propose a reinforcement method for shield tunnels. The reinforcement measures adopted in the method are reasonable in structure and easy to install, and can effectively reinforce the shield tunnel, thereby ensuring the safety of the shield tunnel.

The technical scheme adopted in the present invention is as follows:

The joints of each ring segment of the shield tunnel that need to be reinforced shall be spliced to install steel rings close to the inner wall of the segments; the steel rings shall be welded at the four positions above, below, left and right along the longitudinal direction of the tunnel. I-beams; horizontal and vertical I-steel supports are erected at each steel ring in the tunnel. The end support is on the full-length I-beams on the upper and lower sides of the tunnel, thus forming a complete support system along the tunnel's circumferential and longitudinal directions.

Beneficial effects of the present invention:

The invention can form a complete hoop and longitudinal support structure in the shield tunnel, so that the assembled structure of the shield tunnel has sufficient hoop and longitudinal rigidity and strength under the action of the support. To ensure the safety of the tunnel in case of changing surrounding load conditions.

Description of drawings

Fig. 1 is a schematic diagram of a reinforcement method for setting support inside a shield tunnel of the present invention;

Fig. 2 is a schematic diagram of steel ring;

Fig. 3 is a longitudinal schematic diagram of multi-group ring segment reinforcement.

Among them, 1. steel ring, 2. full-length I-beam, 3. horizontal I-beam support, 4. vertical square

Supported to the I-beam.

Detailed ways

The present invention will be described below in conjunction with the embodiment of accompanying drawing 1 .

Example:

As shown in Figure 1, this is a reinforcement method for setting supports inside the shield tunnel.

The specific implementation method is:

Set the steel ring 1 close to the inner wall of the segment at the joint of each ring segment of the shield tunnel that needs to be reinforced. The steel ring 1 can be spliced in pieces, which is convenient for transportation and installation; The four positions of ring 1, upper, lower, left and right, are provided with long I-beams 2 along the longitudinal direction of the tunnel. 3 and I-beam support 4 in the vertical direction. The intersections of the vertical I-beam supports 4 are connected by welding, and the reinforcement measures have been set. This reinforcement measure can be removed according to the monitoring situation of the tunnel after the completion of the adjacent underground works, so that the tunnel can be used normally.

Claims (1)

1. A reinforcement method for setting support inside a shield tunnel, characterized in that: Set the steel ring (1) close to the inner wall of the segment at the joint of each ring segment of the shield tunnel to be reinforced; after the steel ring (1) is installed, place the upper, lower, left, and The four positions on the right are provided with long I-beams (2) along the longitudinal direction of the tunnel; the horizontal I-beam support (3) and the vertical I-beam support (4) are erected at the steel ring (1), and the horizontal I-beam support (4) is erected. The two ends of the I-beam support (3) and the vertical direction I-beam support (4) are respectively fixed in the steel ring (1) by the I-beam (2); the horizontal direction I-beam support (3) and the vertical direction The I-beam support (4) is fixedly connected at the intersection.