A prefabricated base in a shield tunnel and its connection structure with the pipe segment

Abstract

The present invention discloses a prefabricated foundation in a shield tunnel, including a prefabricated concrete foundation, characterized in that: the prefabricated concrete foundation is provided with a horizontally arranged foundation top surface and a foundation bottom surface, one side of which is a foundation arc surface arranged corresponding to the pipe segment, and the other side is a foundation vertical surface, the prefabricated concrete foundation is provided with a reserved bolt hole, the reserved bolt hole extends from the foundation top surface to the foundation arc surface, and a reserved hand hole is arranged on the foundation top surface near the reserved bolt hole; a caulking chamfer is arranged at the junction of the foundation top surface and the foundation arc surface, and a reserved steel bar matched with the pipe segment is arranged below the foundation bottom surface. On the one hand, the present invention avoids the previous process of planting a large number of steel bars on the pipe segment during the construction of the shield tunnel foundation, and reduces the damage to the pipe segment structure; on the other hand, it avoids the erection of a large number of templates for foundation construction, increases construction efficiency, and improves the prefabrication assembly rate of the shield tunnel; the structure is easy to install, the connection is firm, the construction is fast, and it is economical and reasonable.

Description

Technical Field

[0001] The invention belongs to the field of shield tunnel engineering, and in particular relates to a prefabricated base in a shield tunnel and a connection structure between the base and a pipe segment. Background Art

[0002] In recent years, with the rapid development of social economy and urbanization, shield tunnel technology has become an indispensable key technology in the construction of major transportation and other infrastructure in my country, and the prefabrication of the internal structure of the tunnel has also become a major trend in shield tunnel construction. However, due to the irregular shape of the lower base of the double-layer shield tunnel and the need for a large amount of rebar planting, the lower base of the double-layer shield tunnel has not yet adopted prefabrication design and construction technology.

[0003] Due to the dense reinforcement of shield tunnel segments, there are many waste holes when planting reinforcement in the base during actual construction, which leads to serious damage to the segment reinforcement area, affecting the stress and durability of the tunnel structure. At the same time, due to the large workload of planting reinforcement and casting in place, the construction speed is slow, affecting the construction efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a prefabricated base in a shield tunnel and a connection structure between the base and the pipe segment, which eliminates the reinforcement process, reduces damage to the pipe segment structure, avoids the erection of a large number of templates, and increases construction efficiency.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a precast foundation in a shield tunnel, including a precast concrete foundation, characterized in that: the precast concrete foundation is provided with a horizontally arranged base top surface and a base bottom surface, one side of which is a base arc surface arranged corresponding to the pipe segment, and the other side is a base vertical surface, the precast concrete foundation is provided with a reserved bolt hole, the reserved bolt hole extends from the base top surface to the base arc surface, and a reserved hand hole is arranged on the base top surface near the reserved bolt hole; a caulking chamfer is arranged at the junction of the base top surface and the base arc surface, and a reserved steel bar matching the pipe segment is arranged below the base bottom surface.

[0006] Furthermore, the reserved bolt holes and reserved hand holes are arranged at intervals along the longitudinal direction of the base, that is, along the longitudinal direction of the tunnel; and the caulking chamfers are arranged continuously along the longitudinal direction of the base, that is, along the longitudinal direction of the tunnel.

[0007] Furthermore, reserved steel bars or sleeves are provided on the top surface of the base to facilitate prefabrication and assembly of columns or walls on the base and other lane structures.

[0008] Furthermore, the radius of the arc surface of the base is 10-100 mm smaller than the inner diameter of the shield tunnel segment to facilitate leveling and adjustment of the base.

[0009] A connection structure between a prefabricated foundation and a pipe segment in a shield tunnel, characterized in that: a base connection nut is pre-embedded in the pipe segment, a cushion layer is laid at the connection portion between the pipe segment and the foundation, a prefabricated concrete foundation is installed on the cushion layer, connection bolts are inserted into reserved bolt holes of the prefabricated concrete foundation, and the tail ends of the connection bolts are screwed into the base connection nuts in the pipe segment; and a cast-in-place node is formed at the reserved steel bar below the bottom surface of the foundation.

[0010] Furthermore, columns or walls are arranged on the base.

[0011] A construction method for a connection structure between a prefabricated base and a segment in a shield tunnel, characterized in that the construction method comprises the following steps:

[0012] A. Make the segments and precast concrete bases. When producing the segments, the base connection nuts are embedded. The precast concrete base is provided with reserved bolt holes. A reserved hand hole is provided on the top surface of the base near the reserved bolt holes. A caulking chamfer is provided at the joint between the top surface of the base and the segment.

[0013] B. After the segments are assembled and formed, a cushion layer is laid at the connection with the base;

[0014] C. Assemble the base in place, adjust the base height and direction, insert the connecting bolts through the reserved bolt holes of the precast concrete base and tighten them with the base connecting nuts of the pipe segments. Reserved steel bars matching the pipe segments are provided under the bottom surface of the base;

[0015] D. Tie the lower reinforcement and cast the nodes in place;

[0016] E. Carry out the base caulking construction and hand hole sealing;

[0017] F. Implement columns or walls on the base and other driveway structures.

[0018] Furthermore, the reserved steel bars meet the requirements for steel bar anchorage length.

[0019] Furthermore, the reserved bolt holes and hand holes are arranged at intervals along the longitudinal direction of the base, that is, along the longitudinal direction of the tunnel; and the caulking chamfers are arranged continuously along the longitudinal direction of the base, that is, along the longitudinal direction of the tunnel.

[0020] Compared with the prior art, the present invention prefabricated the base in the shield tunnel and the method for connecting it with the segments, on the one hand, avoids the previous process of embedding a large number of reinforcement bars on the segments during the construction of the shield tunnel base, and reduces the damage to the segment structure; on the other hand, it avoids the erection of a large number of templates during the base construction, increases the construction efficiency, and improves the prefabrication assembly rate of the shield tunnel; the structure is easy to install, the connection is firm, the construction is fast, and it is economical and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the prefabricated foundation in the shield tunnel of the present invention.

[0022] Figure 2 It is a schematic diagram of the connection method between the prefabricated base and the pipe segment in the shield tunnel of the present invention.

[0023] In the figure: 1-precast concrete base; 2-reserved bolt holes; 3-reserved hand holes; 4-reserved caulking chamfers; 5-reserved steel bars; 6-shield tunnel segments; 7-base connecting nuts; 8-cushion; 9-cast-in-place nodes; 10-bolts; 11-base caulking; 12-hand hole sealing; 13-columns or walls and other lane structures. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples.

[0025] A prefabricated foundation in a shield tunnel comprises a prefabricated concrete foundation 1, characterized in that: the prefabricated concrete foundation 1 is provided with a horizontally arranged foundation top surface and a foundation bottom surface, one side of which is a foundation arc surface arranged corresponding to a pipe segment, and the other side is a foundation vertical surface, the prefabricated concrete foundation is provided with a reserved bolt hole 2, the reserved bolt hole 2 extends from the foundation top surface to the foundation arc surface, the reserved bolt hole 2 is 35-55 degrees with the foundation top surface, and a reserved hand hole 3 is arranged on the foundation top surface near the reserved bolt hole; a caulking chamfer is arranged at the junction of the foundation top surface and the foundation arc surface, and a reserved steel bar 5 matching the pipe segment is arranged below the foundation bottom surface.

[0026] The prefabricated foundation in the shield tunnel is composed of a prefabricated concrete foundation 1, reserved bolt holes 2, reserved hand holes 3, caulking chamfers 4 and reserved steel bars 5;

[0027] Furthermore, the construction method is:

[0028] a) The base connection nuts 7 are embedded during the production of the segments 6;

[0029] b) After the segments 6 are assembled and formed, a cushion layer 8 is laid at the connection with the base;

[0030] c) Assemble the base 1 into place, adjust the height and direction of the base 1, insert the connecting bolts 10 through the bolt holes 2 and tighten them;

[0031] d) Tie the reserved steel bars 5 at the bottom of the base to the reserved steel bars on both sides of the lane and cast the cast-in-place nodes 9;

[0032] e) Perform base caulking 11 at the caulking chamfer, and seal the reserved hand hole 3 12;

[0033] f) Implement columns or walls and other driveway structures on the base13.

[0034] Furthermore, the cross section of the precast concrete base 1 is approximately an inverted right-angled trapezoid; reserved steel bars 5 are arranged on the bottom surface (short side) of the base; bolt hand holes 3 and caulking chamfers 4 are arranged on the top surface (long side) of the base; and the inclined surface is an arc surface of the base.

[0035] Furthermore, the reserved steel bars 5 meet the requirements for the anchorage length of the steel bars.

[0036] Furthermore, the reserved bolt holes 2 and hand holes 3 are arranged at intervals along the longitudinal direction of the base 1, that is, along the longitudinal direction of the tunnel; and the caulking chamfers 4 are continuously arranged along the longitudinal direction of the base, that is, along the longitudinal direction of the tunnel.

[0037] Furthermore, the top surface (long side) of the base may be provided with reserved steel bars or sleeves to facilitate the prefabrication and assembly of columns or walls on the base and the remaining lane structure 13 .

[0038] Furthermore, the radius of the inclined arc is 10-100 mm smaller than the inner diameter of the shield tunnel segment to facilitate leveling and adjustment of the base.

[0039] The content of the present invention has been described in detail through the above preferred embodiments, but it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be obvious to those skilled in the art for various modifications and substitutions of the present invention. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A prefabricated foundation in a shield tunnel, comprising a prefabricated concrete foundation, characterized in that: The precast concrete foundation is provided with a horizontally arranged top surface and a bottom surface of the foundation, one side of which is a base arc surface arranged corresponding to the pipe segment, and the other side is a vertical surface of the foundation. The precast concrete foundation is provided with a reserved bolt hole, the reserved bolt hole extends from the top surface of the foundation to the base arc surface, and a reserved hand hole is arranged on the top surface of the foundation near the reserved bolt hole; a caulking chamfer is arranged at the junction of the top surface of the foundation and the base arc surface, and a reserved steel bar matched with the pipe segment is arranged below the bottom surface of the foundation, and the reserved bolt holes and the reserved hand holes are arranged at intervals along the longitudinal direction of the foundation, that is, the longitudinal direction of the tunnel; the caulking chamfer is continuously arranged along the longitudinal direction of the foundation, that is, the longitudinal direction of the tunnel, and a reserved steel bar or sleeve is arranged on the top surface of the foundation to facilitate the prefabrication and assembly of columns or walls on the foundation and other lane structures.

2. The prefabricated foundation in a shield tunnel according to claim 1, characterized in that: The radius of the arc surface of the base is 10 to 100 mm smaller than the inner diameter of the shield tunnel segment to facilitate leveling and adjustment of the base.

3. A connection structure between a prefabricated base and a segment in a shield tunnel, characterized in that: The base connecting nuts are embedded in the segments, a cushion layer is laid at the connection between the segments and the base, the precast concrete base is installed on the cushion layer, the connecting bolts are inserted into the reserved bolt holes of the precast concrete base, and the tail ends of the connecting bolts are screwed into the base connecting nuts in the segments; a cast-in-place node is formed at the reserved steel bars below the bottom surface of the base.

4. The connection structure between the prefabricated base and the segment in the shield tunnel according to claim 3 is characterized in that: A column or a wall is arranged on the base.

5. A construction method for a connection structure between a prefabricated base and a segment in a shield tunnel, characterized in that The construction method comprises the following steps: A. manufacturing pipe segments and prefabricated concrete bases, pre-embedding base connection nuts during pipe segment production, providing the prefabricated concrete base with reserved bolt holes, and providing reserved hand holes on the top surface of the base near the reserved bolt holes; and providing caulking chamfers at the joints between the top surface of the base and the pipe segment; B. After the segments are assembled and formed, a cushion layer is laid at the connection with the base; C. Assemble the base in place, adjust the base height and direction, insert the connecting bolts through the reserved bolt holes of the precast concrete base and tighten them with the base connecting nuts of the pipe segments. Reserved steel bars matching the pipe segments are provided under the bottom surface of the base; D. Tie the lower reinforcement and cast the nodes in place; E. Carry out the base caulking construction and hand hole sealing; F. Implement columns or walls on the base and other driveway structures.

6. The construction method according to claim 5, characterized in that The reserved bolt holes and hand holes are arranged at intervals along the longitudinal direction of the base, that is, along the longitudinal direction of the tunnel; the caulking chamfers are arranged continuously along the longitudinal direction of the base, that is, along the longitudinal direction of the tunnel.

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