Bolt hole reinforcement structure and construction method for shield tunnel segments

Abstract

The present invention relates to a shield tunnel segment bolt hole reinforcement structure and a construction method. The reinforcement structure is placed in a hand hole and a bolt hole between segments, and includes a hand hole reinforcement wall, a bolt hole reinforcement wall and an elastic buffer expansion end from the inside to the outside, and the center is continuously connected. When the segments are assembled, the elastic buffer expansion ends are aligned, and the segment bolts are inserted from the hand holes for fixing. The segment bolt reinforcement structure can provide flexible buffering at the joint when the segments are displaced and deformed, and avoids concrete cracking caused by bolts squeezing bolt holes and hand holes, thereby overcoming the defects of the prior art, having strong practicality and economy, and being easy to operate.

Description

Technical Field

[0001] The invention relates to the technical field of urban subway shield tunnel construction, and in particular to a shield tunnel segment bolt hole reinforcement structure and an application method thereof. Background Art

[0002] With the rapid advancement of urbanization in my country, urban rail transit has entered a golden period of development, among which the development of subway shield tunnels is particularly rapid. The core assembly component of subway tunnels is the shield segment, which, as the permanent lining structure of the tunnel, directly affects the safety of subway tunnels during construction and operation.

[0003] When a shield tunnel passes through ground fissures, fault zones, overlying excavation unloading areas and other strata with large relative displacement, it is easy to cause damage between two axially adjacent segments. Adjacent segments are mainly connected by segment bolts. The first deformation and damage in conventional shield tunnels is near the bolts. The bolts yield under tension and cause cracking and damage to the nearby lining. Therefore, it is particularly important to solve the problem of segment damage at the bolt connection. Summary of the invention

[0004] The purpose of the present invention is to provide a shield tunnel segment bolt hole reinforcement structure and construction method, which provides flexible buffering at the joints when the segments are displaced and deformed, so as to avoid concrete cracking caused by bolts squeezing bolt holes and hand holes.

[0005] The technical solution adopted by the present invention is:

[0006] The shield tunnel segment bolt hole reinforcement structure is characterized by:

[0007] The reinforcement structure is placed in the hand holes and bolt holes between the segments, and includes, from the inside to the outside, a hand hole reinforcement wall, a bolt hole reinforcement wall and an elastic buffer expansion end, with a continuous through-center.

[0008] The hand hole reinforcement guard wall is located in the hand hole and has a groove-shaped structure. One side of the inner wall of the corresponding pipe segment is open, and the outer end of the groove-shaped structure is opened and connected to the bolt hole reinforcement guard wall.

[0009] The bolt hole reinforcement wall is located in the bolt hole and is in a tubular shape, with one end connected to the opening of the bolt hole reinforcement wall and the other end connected to the elastic buffer expansion end.

[0010] The elastic buffer expansion end is located at the outer end of the bolt hole and the end face of the pipe segment, and the cross section gradually expands from the inside to the outside. There is a through hole in the center, and the inner side of the through hole is connected to the outer end of the bolt hole reinforcement wall.

[0011] The elastic buffer expansion end is made of flexible material.

[0012] A bolt reinforcement sleeve is arranged in the through hole of the elastic buffer enlarged end, and the bolt reinforcement sleeve is a part of the bolt hole reinforcement protective wall.

[0013] When circumferentially or axially adjacent segments are spliced, the positions of the reinforcement structures in the segments correspond to each other, and the elastic buffer expansion ends are aligned with each other.

[0014] The method for constructing the shield tunnel segment bolt hole reinforcement structure is characterized by:

[0015] The method is:

[0016] When prefabricating the pipe segment, the hand hole reinforcement wall is fixed at the hand hole position in the mold, the bolt hole reinforcement wall is fixed at the bolt hole position in the mold, and the bolt hole at the joint is fixed with the expanded end cone mold plug. After the fixing is completed, pouring is carried out;

[0017] After the segment is formed, remove the expanded end cone mold plug, insert the elastic buffer expanded end into the bolt hole at the joint, insert the bolt reinforcement sleeve into the elastic buffer expanded end, align the elastic buffer expanded end when assembling the segment, and insert the segment bolts from the hand hole to fix it.

[0018] The present invention has the following advantages:

[0019] The present invention is a segment bolt hole reinforcement structure used for crossing ground fissures, fault zones, overlying excavation unloading areas and other strata with large relative displacement. It is mainly used to adapt to strata with large relative displacement or load changes. It mainly adopts a reinforcement scheme of adding hand holes and bolt holes to strengthen the protective wall and adding elastic buffer bodies around the bolt holes near the edge of the segment. When the segment is prefabricated, the hand hole reinforcement protective wall is fixed to the hand hole position in the mold, the bolt hole reinforcement protective wall is fixed to the bolt hole position in the mold, and the enlarged end cone mold plug is fixed to the bolt hole at the joint. After the fixing is completed, casting is carried out. After the segment is formed, the enlarged end cone mold plug is removed, and the elastic buffer enlarged end is plugged into the bolt hole at the joint, so that the bolt hole reinforcement protective wall and the elastic buffer enlarged end are tightly connected. When assembling the segments, align the enlarged ends of the elastic buffers, and insert the segment bolts through the hand holes to fix them. The segment bolt reinforcement structure can provide flexible buffering at the joints when the segments are displaced and deformed, and avoid concrete cracking caused by bolts squeezing bolt holes and hand holes, thus overcoming the defects of the prior art, having strong practicality and economy, and being easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the reinforcement structure at the connection of shield tunnel segments of the present invention;

[0021] Figure 2 It is a schematic diagram of the inter-ring reinforcement and dislocation buffering measures of the present invention;

[0022] Figure 3 It is another perspective schematic diagram of the inter-ring reinforcement and dislocation buffering measures of the present invention;

[0023] Figure 4 It is a schematic diagram of the implementation process of the present invention.

[0024] In the figure: 1-inter-ring reinforcement and displacement buffer measures, 2-hand holes and bolt holes between segments, 3-segments;

[0025] 101-hand hole reinforced protective wall, 102-bolt hole reinforced protective wall, 103-elastic buffer expansion end. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with specific implementation modes.

[0027] The present invention relates to a shield tunnel segment bolt hole reinforcement structure, which is an inter-ring reinforcement and displacement buffering measure, which is placed in the hand holes and bolt holes 2 between the segments, and includes a hand hole reinforcement wall 101, a bolt hole reinforcement wall 102 and an elastic buffer expansion end 103 from the inside to the outside, and is continuously connected in the center.

[0028] The hand hole reinforcement wall 101 is located in the hand hole and is in a groove-shaped structure. One side of the inner wall of the corresponding segment 3 is open, and the outer end of the groove-shaped structure is opened and connected to the bolt hole reinforcement wall 102. The bolt hole reinforcement wall 102 is located in the bolt hole and is in a tubular shape. One end is connected to the opening of the bolt hole reinforcement wall 102, and the other end is connected to the elastic buffer expansion end 103. The elastic buffer expansion end 103 is located at the outer end of the bolt hole and the end face of the segment 3. The cross section gradually expands from the inside to the outside, and there is a through hole in the center. The inner side of the through hole is connected to the outer end of the bolt hole reinforcement wall 102.

[0029] The elastic buffer expansion end 103 is made of a flexible material, such as rubber. The hand hole reinforcement wall 101 can enhance the local strength, so that the edge of the pipe segment will not crack when subjected to greater extrusion; the bolt hole reinforcement wall 102 can increase the overall strength, and prevent the bolt hole from cracking and falling off; the elastic buffer expansion end 103 can provide flexible buffering at the joint when the pipe segment 3 is displaced and deformed, absorb most of the extrusion stress at the edge of the pipe segment, and prevent the edge of the bolt hole of the pipe segment from cracking and damage.

[0030] A bolt reinforcement sleeve is arranged in the through hole of the elastic buffer expansion end 103. The bolt reinforcement sleeve is a part of the bolt hole reinforcement protective wall 102 structure and is located on the side close to the elastic buffer expansion end 103. It can be a steel sleeve and can have a threaded shape to better combine and fix it with the elastic buffer expansion end.

[0031] When the circumferentially or axially adjacent segments 3 are spliced, the positions of the reinforcement structures in the segments 3 correspond to each other, and the elastic buffering enlarged ends 103 are aligned with each other.

[0032] The construction method of the above-mentioned shield tunnel segment bolt hole reinforcement structure is:

[0033] When prefabricating the pipe segment 3, the hand hole reinforcement wall 101 is fixed at the hand hole position in the mold, the bolt hole reinforcement wall 102 is fixed at the bolt hole position in the mold, and the enlarged end cone mold plug is fixed at the bolt hole at the joint. After the fixing is completed, pouring is carried out;

[0034] After the pipe segment 3 is formed, the expanded end cone mold plug is removed, the elastic buffer expanded end 103 is inserted into the bolt hole at the joint, and the bolt reinforcement sleeve is inserted into the elastic buffer expanded end 103. When assembling the pipe segments, align the elastic buffer expanded end 103 and insert the pipe segment bolts from the hand hole to fix them.

[0035] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. A method for constructing a shield tunnel segment bolt hole reinforcement structure, characterized in that: The reinforcement structure is placed in the hand hole and the bolt hole (2) between the segments, and comprises, from the inside to the outside, a hand hole reinforcement wall (101), a bolt hole reinforcement wall (102) and an elastic buffer expansion end (103), and is continuously connected at the center; The hand hole reinforcement wall (101) is located in the hand hole and has a groove-shaped structure, one side of the inner wall of the corresponding pipe segment (3) is open, and the outer end of the groove-shaped structure has a hole and is connected to the bolt hole reinforcement wall (102); The bolt hole reinforcement wall (102) is located in the bolt hole and is in a tubular shape, with one end connected to the opening of the bolt hole reinforcement wall (102) and the other end connected to the elastic buffer expansion end (103); The elastic buffer expansion end (103) is located at the outer end of the bolt hole and inside the end surface of the pipe segment (3), with a cross section gradually expanding from the inside to the outside, and a through hole at the center, the inner side of the through hole being connected to the outer end of the bolt hole reinforcement wall (102); The elastic buffer enlarged end (103) is made of a flexible material; A bolt reinforcement sleeve is arranged in the through hole of the elastic buffer enlarged end (103), and the bolt reinforcement sleeve is a part of the bolt hole reinforcement protective wall (102); When circumferentially or axially adjacent segments (3) are spliced, the positions of the reinforcement structures in the segments (3) correspond to each other, and the elastic buffer enlarged ends (103) are aligned with each other; The method comprises the following steps: When prefabricating the pipe segment (3), the hand hole reinforcement wall (101) is fixed at the hand hole position in the mold, the bolt hole reinforcement wall (102) is fixed at the bolt hole position in the mold, and the enlarged end cone mold plug is fixed at the bolt hole at the joint. After the fixing is completed, pouring is performed; After the pipe segment (3) is formed, the mold plug of the expanded end cone is removed, the elastic buffer expanded end (103) is inserted into the bolt hole at the joint, and the bolt reinforcement sleeve is inserted into the elastic buffer expanded end (103). When assembling the pipe segment, the elastic buffer expanded end (103) is aligned, and the pipe segment bolts are inserted from the hand hole to fix.

Images