A shield segment connection structure and implementation method for an earthquake active fault zone

Abstract

The present invention provides a shield segment connection structure for an earthquake active fault zone, comprising a plurality of shield segments located in an earthquake active fault zone, wherein adjacent shield segments are connected by oblique bolts and straight bolts along the length direction of the shield tunnel, and the oblique bolts and straight bolts are distributed at intervals along the circumferential direction of the shield tunnel. The present invention also provides an implementation method of the shield segment connection structure for an earthquake active fault zone. The shield segment connection structure for an earthquake active fault zone provided by the present invention adds straight bolt connections inside the segments, increases the connection strength at the joints, can effectively resist the impact force generated by fault dislocation under the action of a strong earthquake, and improves the deformation resistance of the segments in the section affected by the active fault.

Description

Technical Field

[0001] The invention relates to the field of tunnel engineering, and in particular to a shield segment connection structure in an earthquake active fault zone and an implementation method thereof. Background Art

[0002] With the rapid development of my country's economy and society, large-scale underwater tunnel projects have entered a period of rapid development. Shield tunnels have been widely used due to their safety, speed, and technology. The construction of shield tunnels has gradually increased, and the construction conditions have become more and more complex. Under normal circumstances, no special seismic measures are required for the shield tunnel segment structure. However, in recent years, with the construction of more and more shield tunnels, some tunnels are even located in high seismic intensity areas and active fault zones of 8 degrees or above. Ordinary bolt connections cannot meet the safety and durability requirements of shield tunnels under strong earthquakes in complex geology and high-intensity earthquake zones, and special seismic measures must be adopted.

[0003] At present, the seismic resistance methods and measures of shield tunnels at home and abroad are mainly aimed at soft strata, that is, to strengthen the foundation of soft strata along the line and reduce the seismic response of the shield tunnel (mainly to reduce the seismic displacement of the shield tunnel). The obvious disadvantage of this method and measure is that the seismic response (mainly the seismic displacement of the shield tunnel) is difficult to completely eliminate. When the seismic response is too large, the tunnel structure cannot meet the requirements of safety and durability. Moreover, this method has large engineering workload, high cost, complex construction process and difficult to ensure quality.

[0004] Therefore, it is necessary to design a new shield segment connection structure and implementation method in seismic active fault zones to overcome the above problems. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a shield segment connection structure and implementation method in an earthquake active fault zone. On the one hand, high-strength tie rods (bolts) are added to the segment structure to resist the tensile force of fault displacement; on the other hand, the tie rod (bolt) material has strong elasticity, and its elastic properties are used to eliminate part of the tensile deformation and avoid the bolt from breaking and damage. The present invention solves at least some of the problems in the prior art.

[0006] The present invention is achieved in that:

[0007] The present invention provides a shield segment connection structure in an earthquake active fault zone, comprising a plurality of shield segments located in the earthquake active fault zone. Adjacent shield segments are connected along the length direction of the shield tunnel by oblique bolts and straight bolts, and the oblique bolts and straight bolts are distributed at intervals along the annular direction of the shield tunnel.

[0008] Furthermore, along the circumferential direction of the shield tunnel, oblique bolts are provided on both sides of the straight bolts.

[0009] Furthermore, the oblique bolts are elastic high-strength oblique bolts, and the straight bolts are elastic high-strength straight bolts.

[0010] Furthermore, along the length direction of the shield tunnel, straight bolt through holes for straight bolts to pass through are provided at both ends of the shield segment, and straight bolt hand holes are also provided on the shield segment. The two straight bolt through holes are arranged side by side corresponding to one straight bolt hand hole, and the two straight bolt through holes are connected to the corresponding straight bolt hand holes. The straight bolts extend into the straight bolt hand holes and are fixedly connected by straight bolt nuts.

[0011] Furthermore, an embedded steel plate is provided in the pipe segment at the straight bolt hand hole.

[0012] Furthermore, an inclined bolt hand hole and an inclined bolt through hole for the inclined bolt to pass through are opened at one end of the shield segment, the inclined bolt through holes correspond to the inclined bolt hand holes one by one, and the inclined bolt through holes are connected to the corresponding inclined bolt hand holes, and an inclined bolt embedded nut is provided at the other end of the shield segment, and the inclined bolt embedded nut is used to fix the inclined bolt passing through the inclined bolt through hole of the adjacent shield segment.

[0013] The present invention also provides a method for implementing a shield segment connection structure in an earthquake active fault zone: comprising:

[0014] S1, adjacent rings of shield segments are butt-jointed through annular seams;

[0015] S2. Pass the straight bolts through the straight bolt through holes of the two adjacent rings, and screw the oblique bolts through the oblique bolt hand holes and into the oblique bolt embedded nuts;

[0016] S3. Use straight bolts and nuts to fix the two ends of the straight bolts in the straight bolt hand holes of the two adjacent rings respectively, and tighten the inclined bolts with pre-embedded nuts to achieve effective connection of adjacent rings of the shield segment.

[0017] The present invention has the following beneficial effects:

[0018] 1. The shield segment connection structure for an earthquake active fault zone provided by the present invention adds straight bolt connections inside the segments, thereby increasing the connection strength at the joints, and can effectively resist the impact force generated by fault dislocation under the action of a strong earthquake, thereby improving the deformation resistance of the segments in the section affected by the active fault.

[0019] 2. The present invention provides a shield segment connection structure for an earthquake active fault zone, in which the bolts are made of high-strength steel with strong elasticity. While increasing the connection stiffness, the elastic properties of the bolts themselves are used to eliminate part of the tensile deformation, thereby weakening the influence of the fault layer movement, avoiding the breakage of the bolts, and improving the overall stability of the segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A bolt hole arrangement diagram provided for an embodiment of the present invention;

[0022] Figure 2 A diagram of a pipe segment connection structure provided in an embodiment of the present invention;

[0023] Figure 3 The embodiment of the present invention provides Figure 2 Enlarged view of the middle left half;

[0024] Figure 4 A schematic diagram of an annular seam oblique bolt connection provided by an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of an annular straight bolt connection provided in an embodiment of the present invention.

[0026] Markings in the figure: 1-shield segment, 2-high-strength oblique bolt, 3-high-strength straight bolt, 4-oblique bolt washer, 5-straight bolt washer, 6-oblique bolt embedded nut, 7-straight bolt nut, 8-oblique bolt through hole, 9-straight bolt through hole, 10-oblique bolt hand hole, 11-straight bolt hand hole, 12-circumferential seam, 13-oblique bolt hexagonal head, 14-embedded steel plate, 15-longitudinal seam. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1-Figure 5, Embodiment 1 of the present invention provides a shield segment connection structure for an earthquake active fault zone, comprising a plurality of shield segments 1 located in an earthquake active fault zone, and adjacent shield segments 1 are connected by high-strength inclined bolts 2 and high-strength straight bolts 3 along the length direction of the shield tunnel (longitudinal direction of the shield tunnel), and the high-strength inclined bolts 2 and high-strength straight bolts 3 are spaced along the annular direction of the shield tunnel (circumferential direction of the shield tunnel). The shield segment connection structure for an earthquake active fault zone provided by the present invention adds straight bolt connections inside the segments, increases the connection strength at the joints, can effectively resist the impact force generated by fault displacement under the action of a strong earthquake, and improves the deformation resistance of the segments in the section affected by the active fault. The shield segment connection structure for an earthquake active fault zone provided by the present invention uses high-strength steel with strong elasticity for the bolts, which increases the connection stiffness and eliminates part of the tensile deformation by using its own elastic properties, thereby weakening the influence of fault displacement, avoiding bolt fracture and damage, and improving the overall stability of the segments.

[0029] Along the circumferential direction of the shield tunnel, high-strength inclined bolts 2 are provided on both sides of the high-strength straight bolts 3 .

[0030] Along the length direction of the shield tunnel, both ends of the shield segment 1 are provided with straight bolt through holes 9 for high-strength straight bolts 3 to penetrate, and the shield segment 1 is also provided with straight bolt hand holes 11, and the two straight bolt through holes 9 are arranged side by side corresponding to one straight bolt hand hole 11, and the two straight bolt through holes 9 are connected with the corresponding straight bolt hand holes 11, and the high-strength straight bolts 3 extend into the straight bolt hand holes 11 and are fixedly connected by straight bolt nuts 7. An embedded steel plate 14 is provided in the segment at the straight bolt hand holes 11. The straight bolt washers 5 are arranged between the straight bolt nuts 7 and the shield segment 1. The straight bolt through holes 9 are reserved holes, which are convenient for the high-strength straight bolts 3 to penetrate and connect the two adjacent segments.

[0031] One end of the shield segment 1 is provided with an oblique bolt hand hole 10 and an oblique bolt through hole 8 for the high-strength oblique bolt 2 to pass through. The oblique bolt through holes 8 correspond to the oblique bolt hand holes 10 one by one, and the oblique bolt through holes 8 are connected with the corresponding oblique bolt hand holes 10. The other end of the shield segment 1 is provided with an oblique bolt embedded nut 6, which is used to fix the high-strength oblique bolt 2 passing through the oblique bolt through hole 8 of the adjacent shield segment. The oblique bolt hexagonal head 13 is located in the oblique bolt hand hole 10, and the oblique bolt washer 4 is arranged between the oblique bolt hexagonal head 13 and the shield segment 1. The oblique bolt through hole 8 is a reserved hole for the high-strength oblique bolt 2 to penetrate and connect the two adjacent segments.

[0032] Embodiment 2 of the present invention provides a method for implementing a shield segment connection structure in an earthquake active fault zone, comprising the following steps:

[0033] S1, adjacent rings of shield segments are butted together through annular seams 12;

[0034] S2, pass the high-strength straight bolts 3 through the straight bolt through holes 9 of the two adjacent rings, and screw the high-strength oblique bolts 2 through the oblique bolt hand holes 10 through the oblique bolt through holes 8 into the oblique bolt embedded nuts 6;

[0035] S3. Use straight bolts and nuts 7 to fix the two ends of the high-strength straight bolts 3 in the straight bolt hand holes 11 of the two adjacent rings respectively, and tighten the high-strength oblique bolts 2 through the oblique bolt embedded nuts 6 to achieve effective connection of adjacent rings of the shield segment.

[0036] The present invention provides a shield segment connection structure for an earthquake active fault zone, comprising a shield segment 1, a high-strength oblique bolt 2, a high-strength straight bolt 3, an oblique bolt washer 4, a straight bolt washer 5, an oblique bolt embedded nut 6, a straight bolt nut 7, an oblique bolt through hole 8, a straight bolt through hole 9, an oblique bolt hand hole 10, a straight bolt hand hole 11, an annular seam 12, an oblique bolt hexagonal head 13, an embedded steel plate 14, and a longitudinal seam 15.

[0037] The shield segment 1 is a bolt hole through structure, and the two adjacent ring segments in the active fault affected section are longitudinally connected by high-strength inclined bolts 2 and high-strength straight bolts 3. At the annular seam 12, the high-strength straight bolts 3 pass through the straight bolt through holes 9 and extend into the straight bolt hand holes 11 and are fixedly connected by straight bolt nuts 7. The high-strength inclined bolts 2 pass through the inclined bolt hand holes 10 and the inclined bolt through holes 8 in sequence and are fixedly connected with the inclined bolt embedded nuts 6 embedded in the adjacent segments.

[0038] The materials of the high-strength inclined bolts 2 and the high-strength straight bolts 3 are both high-strength steel with strong elasticity. High-strength inclined bolts 2 and high-strength straight bolts 3 are set in each ring at the connection of the annular seam 12. The inclined bolt washers 4 and straight bolt washers 5 are both steel washers. The inclined bolt washers 4 are set between the inclined bolt hexagonal heads 13 and the shield segments 1, and the straight bolt washers 5 are set between the straight bolt nuts 7 and the shield segments 1. The straight bolt nuts 7 are ordinary steel nuts.

[0039] The oblique bolt through holes 8 and the straight bolt through holes 9 are reserved holes for the high-strength oblique bolts 2 and the high-strength straight bolts 3 to penetrate. The oblique bolt through holes 8 are cylindrical reserved holes that are small at the bottom and large at the joints; the straight bolt holes 9 are through reserved holes of the same size throughout the ring.

[0040] At the same time, the present invention provides an implementation process of a shield segment connection structure in an earthquake active fault zone as follows:

[0041] S1: Adjacent rings of shield segments are butt-jointed via annular seams 12.

[0042] S2: Insert the high-strength oblique bolt 2 into the oblique bolt washer 4 and screw it into the oblique bolt embedded nut 6 from the oblique bolt hand hole 10 through the oblique bolt through hole 8 to achieve the connection between the two ring segments.

[0043] S3: Insert the high-strength straight bolt 3 from the front side of the shield segment 1 through the straight bolt through hole 9 into the shield segment 1 to the adjacent ring straight bolt reserved hand hole 11, insert the straight bolt washers 5 into the two ends of the high-strength straight bolt 3 respectively, and then use the straight bolt nut 7 to tighten the high-strength straight bolt 3 at the straight bolt hand hole 11 (a pre-buried steel plate 14 is provided in the segment at the straight bolt hand hole 11).

[0044] S4: Tighten the high-strength inclined bolts 2 through the inclined bolt embedded nuts 6 and the high-strength straight bolts 3 through the straight bolt nuts 7 to meet the design requirements and realize the effective connection of adjacent rings of the shield segment 1.

[0045] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shield segment connection structure in an earthquake active fault zone, characterized in that: The invention comprises a plurality of shield segments located in an earthquake active fault zone. Along the length direction of the shield tunnel, adjacent shield segments are connected by high-strength inclined bolts and high-strength straight bolts. The high-strength inclined bolts and high-strength straight bolts are distributed at intervals along the circumferential direction of the shield tunnel. The materials of the high-strength inclined bolts and the high-strength straight bolts are both high-strength steel with strong elasticity. Along the circumferential direction of the shield tunnel, high-strength inclined bolts are arranged on both sides of the high-strength straight bolts. Along the length direction of the shield tunnel, straight bolt through holes for the high-strength straight bolts to penetrate are arranged at both ends of the shield segment. A straight bolt hand hole is also provided in the middle of the shield segment, and the two straight bolt through holes are arranged side by side corresponding to the one straight bolt hand hole, and the two straight bolt through holes are connected to the corresponding straight bolt hand holes, and the high-strength straight bolts extend into the straight bolt hand holes and are fixedly connected by straight bolt nuts; along the length direction of the shield tunnel, the shield segment is a bolt hole through structure; the straight bolt washer is arranged between the straight bolt nut and the shield segment; the straight bolt through hole is a reserved hole, which is convenient for the high-strength straight bolt to penetrate and connect two adjacent segments; the straight bolt through hole is a through reserved hole of the same size in the entire ring.

2. The shield segment connection structure in an earthquake active fault zone according to claim 1, characterized in that: Embedded steel plates are provided in the pipe segments at the straight bolt hand holes.

3. The shield segment connection structure for an earthquake active fault zone according to claim 1, characterized in that: One end of the shield segment is provided with an oblique bolt hand hole and an oblique bolt through hole for the high-strength oblique bolt to pass through, the oblique bolt through holes correspond to the oblique bolt hand holes one by one, and the oblique bolt through holes are connected with the corresponding oblique bolt hand holes, and the other end of the shield segment is provided with an oblique bolt embedded nut, which is used to fix the high-strength oblique bolt passing through the oblique bolt through hole of the adjacent shield segment; the hexagonal head of the oblique bolt is located in the oblique bolt hand hole, and the oblique bolt washer is arranged between the hexagonal head of the oblique bolt and the shield segment; the oblique bolt through hole is a reserved hole, which is convenient for the high-strength oblique bolt to penetrate into and connect the two adjacent segments; the oblique bolt through hole is a cylindrical reserved hole with a small lower part and a large joint.

4. A method for implementing the shield segment connection structure in an earthquake active fault zone according to any one of claims 1 to 3, characterized in that: include S1, adjacent rings of shield segments are butt-jointed through annular seams; S2. The two adjacent ring segments in the active fault affected section are connected longitudinally by high-strength inclined bolts and high-strength straight bolts. At the annular gap, the high-strength straight bolts are inserted through the straight bolt through holes of the two adjacent rings, and the high-strength inclined bolts are screwed into the inclined bolt embedded nuts from the inclined bolt hand holes through the inclined bolt through holes; S3. Use straight bolts and nuts to fix the two ends of high-strength straight bolts in the straight bolt hand holes of the two adjacent rings respectively, and tighten the high-strength inclined bolts through the inclined bolts embedded in the adjacent segments with embedded nuts to achieve effective connection of adjacent rings of the shield segment.

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