Earthquake fault zone setting on shield segment surface seismic structure and implementation method

Abstract

The application provides an anti-seismic structure of a seismic activity fault zone on a shield segment surface, comprising a plurality of shield segments located in the seismic activity fault zone, a plurality of prestressed steel bars arranged on the inner surface of the shield segments, each of the prestressed steel bars extending along the length direction of the shield tunnel, and both ends of each of the prestressed steel bars being fixed on the shield segment along the length direction of the shield tunnel. The application also provides an implementation method of the anti-seismic structure of the seismic activity fault zone on the shield segment surface. The prestressed steel bars are arranged on the inner side of the shield tunnel segment to form a prestressed steel bar ring, the longitudinal connection of the segment ring in the activity fault section is strengthened, the friction between the segment rings is increased, the longitudinal overall rigidity of the segment ring in the activity fault section is improved, the impact force generated by the fault dislocation under the strong earthquake action can be effectively resisted, and the overall anti-seismic capacity of the shield tunnel is improved.

Description

Technical Field

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

[0002] With the rapid development of my country's economy and the continuous advancement of construction equipment technology, large-scale underwater tunnel projects have entered a period of rapid development. Shield-bored tunnels have been widely used due to their safety, speed, and technological advantages, and construction conditions are becoming increasingly complex. Due to the low lining stiffness and large deformation margin of waterproof gaskets at joints, shield-bored tunnel structures generally do not require special seismic measures in areas with seismic intensities below 7 degrees. However, with the increasing number of shield tunnels built in recent years, some tunnels are inevitably located in areas with high seismic intensities of 8 degrees or above and in active fault zones. Ordinary bolted connections cannot meet the safety and durability requirements of shield tunnels in complex geology, high-intensity seismic zones, and active fault zones under strong earthquakes. Special seismic measures must be adopted.

[0003] At present, the seismic resistance methods and measures for shield tunnels at home and abroad are mainly aimed at soft strata, that is, strengthening the foundation of soft strata along the line to reduce the seismic response of the shield tunnel (mainly reducing 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 a large amount of engineering work, high cost, complex construction process, and difficult to guarantee quality.

[0004] Therefore, it is necessary to design an earthquake-resistant structure and implementation method in which an earthquake-active fault zone is located on the surface of a shield segment to overcome the above problems. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the existing technology and provide an earthquake-resistant structure and implementation method arranged on the surface of the shield segment in the earthquake active fault zone. By utilizing the tensile properties of prestressed steel rods, prestressed steel rods are arranged on the inner side of the shield tunnel segment to form a prestressed steel rod ring, thereby strengthening the longitudinal connection of the segment ring in the active fault section to resist the dislocation tension generated under earthquake conditions. The present invention at least solves some of the problems in the existing technology.

[0006] The present invention is achieved in that:

[0007] The present invention provides an earthquake-resistant structure in which an active earthquake fault zone is arranged on the surface of a shield segment, comprising a plurality of shield segments located in the active earthquake fault zone, a plurality of prestressed steel rods being arranged on the inner surface of the shield segment, each of the prestressed steel rods extending along the length direction of the shield tunnel, and each of the prestressed steel rods being fixed to the shield segment at both ends along the length direction of the shield tunnel.

[0008] Furthermore, the prestressed steel bars are distributed at intervals along the circumferential direction of the shield tunnel.

[0009] Furthermore, each of the prestressed steel bars is arranged above the lane layer.

[0010] Furthermore, both ends of each prestressed steel rod along the length direction of the shield tunnel are fixed to the shield segment through a first anchor seat, and the prestressed steel rod is welded to the first anchor seat.

[0011] Furthermore, along the length direction of the shield tunnel, a first embedded steel plate is provided on the inner surface of the shield segment fixedly connected to the end of the prestressed steel rod, and the first anchor seat is welded and fixed to the first embedded steel plate.

[0012] Furthermore, the first embedded steel plate is a curved steel plate.

[0013] Furthermore, the first anchor seat is formed by welding a plurality of anchor seat steel plates, and the anchor seat steel plates extending circumferentially along the shield tunnel are provided with steel rod holes for the prestressed steel rods to pass through for tensioning.

[0014] Furthermore, the prestressed steel bars are arranged at intervals along the circumferential direction of the shield tunnel to form prestressed steel bar rings, and the prestressed steel bar rings are overlapped with adjacent prestressed steel bar rings and arranged in a staggered manner.

[0015] Furthermore, along the length direction of the shield tunnel, the prestressed steel rods are overlapped with adjacent prestressed steel rods, and a second embedded steel plate is also provided on the inner surface of the shield segment provided with the first embedded steel plate. A second anchor seat is welded to the second embedded steel plate, and the ends of adjacent prestressed steel rods are welded to the second anchor seat. Several first anchor seats are welded to the first embedded steel plate, and several second anchor seats are welded to the second embedded steel plate. Along the circumferential direction of the shield tunnel, the first anchor seats and the second anchor seats are arranged at staggered intervals.

[0016] The present invention also provides a method for implementing an earthquake-resistant structure provided on the surface of a shield segment in an earthquake active fault zone, comprising:

[0017] S1. After the shield segments are assembled, the first anchor seat is welded to the first embedded steel plate according to a certain circumferential distance and longitudinal length, and the second anchor seat is welded to the second embedded steel plate according to a certain circumferential distance and longitudinal length;

[0018] S2. Prestressed steel rods are tensioned through the welded first anchor seat and the second anchor seat to form a prestressed steel rod ring along the circumferential direction of the shield tunnel.

[0019] The present invention has the following beneficial effects:

[0020] The present invention provides an anti-seismic structure and implementation method in which an active earthquake fault zone is arranged on the surface of a shield segment. The structure utilizes the tensile strength of prestressed steel rods and arranges prestressed steel rods on the inner side of the shield tunnel segment to form a prestressed steel rod ring. This strengthens the longitudinal connection of the segment rings in the active fault section, increases the friction between the segment rings, and improves the overall longitudinal stiffness of the segment rings in the section affected by the active fault. This structure can effectively resist the impact force generated by fault dislocation under the action of a strong earthquake, thereby improving the overall anti-seismic capability of the shield tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0022] Figure 1 A schematic diagram of the circumferential arrangement range of prestressed steel bars provided in an embodiment of the present invention;

[0023] Figure 2 A longitudinal design drawing of a prestressed steel bar provided in an embodiment of the present invention;

[0024] Figure 3 The embodiment of the present invention provides Figure 2 Enlarged view of part A;

[0025] Figure 4 A diagram illustrating the arrangement of standard segment anchors provided in an embodiment of the present invention;

[0026] Figure 5 The embodiment of the present invention provides Figure 4 Section 1-1. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0028] like Figure 1-Figure 5Embodiment 1 of the present invention provides an earthquake-resistant structure provided on the surface of a shield segment in an earthquake-active fault zone, comprising a plurality of shield segments 1 located in the earthquake-active fault zone, a plurality of prestressed steel rods 5 provided on the inner surface (the side close to the inner side of the tunnel) of the shield segment 1, each of the prestressed steel rods 5 extending along the length direction of the shield tunnel (the longitudinal direction of the shield tunnel), and each of the prestressed steel rods 5 being fixed to the shield segment at both ends along the length direction of the shield tunnel.

[0029] Along the shield tunnel annulus (shield tunnel circumference), each of the prestressed steel bars 5 is spaced apart to form a prestressed steel bar ring. Each of the prestressed steel bars 5 is set above the lane layer, such as Figure 1 The setting range 7 of the circumferential prestressed steel rod is shown.

[0030] Each of the prestressed steel rods 5 is secured to the shield segment 1 at both ends along the length of the shield tunnel via first anchor seats 3, which are welded to the first anchor seats 3. A first embedded steel plate 2 is provided on the inner surface of the shield segment 1, fixedly connected to the ends of the prestressed steel rods 5, along the length of the shield tunnel. The first anchor seats 3 are welded to the first embedded steel plates 2.

[0031] Prestressed steel bars are arranged at intervals along the annular direction of the shield tunnel to form prestressed steel bar rings. The prestressed steel bar rings are overlapped with adjacent prestressed steel bar rings and arranged in a staggered manner. Along the length of the shield tunnel, the prestressed steel bars 5 are overlapped with the adjacent prestressed steel bars 5 (i.e., the ends partially overlap, such as Figure 2 (See section A in the middle section). The inner surface of the shield segment 1, which also includes the first embedded steel plate 2, is also provided with a second embedded steel plate 9. Second anchor seats 4 are welded to the second embedded steel plate 9, and the ends of adjacent prestressed steel rods 5 are welded to the second anchor seats 4. Several first anchor seats 3 are welded to the first embedded steel plate 2, and several second anchor seats 4 are welded to the second embedded steel plate 9. These first anchor seats 3 and second anchor seats 4 are arranged in a staggered pattern along the circumference of the shield tunnel. Figure 2 The segment ring width 11, the segment center line 12, and the prestressed steel rod length 13 are shown in the figure.

[0032] The first embedded steel plate 2 and the second embedded steel plate 9 are both arc-shaped steel plates. The first embedded steel plate 2 and the second embedded steel plate 9 are prefabricated together with the shield segment 1. The edges of the first embedded steel plate 2 and the second embedded steel plate 9 are kept at a certain distance from the circumferential joint of the shield segment.

[0033] like Figure 3 The first anchor seat 3 and the second anchor seat 4 are both welded by a number of anchor seat steel plates 8. The anchor seat steel plates 8 extending along the circumferential direction of the shield tunnel are provided with steel rod holes 6 for the prestressed steel rods 5 to pass through for tensioning. Figure 5 The direction 14 of the prestressing steel rod is shown.

[0034] The second embodiment of the present invention provides a method for implementing an earthquake-resistant structure provided on the surface of a shield segment in an earthquake active fault zone, comprising:

[0035] S1. After the shield segments 1 are assembled, the first anchor seat 3 is welded to the first embedded steel plate 2 at a certain circumferential distance and longitudinal length, and the second anchor seat 4 is welded to the second embedded steel plate 9 at a certain circumferential distance and longitudinal length;

[0036] S2. Prestressed steel rods 5 are tensioned through the welded first anchor seat 3 and the second anchor seat 4 to form a prestressed steel rod ring along the circumferential direction of the shield tunnel.

[0037] The present invention provides an earthquake-resistant structure and implementation method in which an earthquake active fault zone is arranged on the surface of a shield segment. The first embedded steel plate 2 and the second embedded steel plate 9 are both arc-shaped steel plates. The first embedded steel plate 2 and the second embedded steel plate 9 are both arranged on the inner surface of the shield segment 1 and are prefabricated together with the shield segment 1. A certain distance is left between the edges of the first embedded steel plate 2 and the edges of the second embedded steel plate 9 and the joints of the shield segment. The first embedded steel plate 2 and the second embedded steel plate 9 are all provided on the entire ring of the segment 1 in the active fault affected section.

[0038] The first anchor seat 3 and the second anchor seat 4 are both welded by anchor seat steel plates 8. After the first anchor seat 3 and the second anchor seat 4 are manufactured, they are fixed on the first embedded steel plate 2 and the second embedded steel plate 9 on the inner side of the shield segment by welding.

[0039] The steel rod hole 6 is reserved in the middle of the circumferential anchor seat steel plate of the first anchor seat 3 and the second anchor seat 4, and its diameter is slightly larger than the diameter of the prestressed steel rod.

[0040] The prestressed steel rods 5 are arranged above the roadway layer, forming a prestressed steel rod ring. The diameter of each prestressed steel rod, the ultimate strength standard value, and the number of prestressed steel rods arranged in a ring are determined based on calculation results. The longitudinal arrangement range 10 of the prestressed steel rods 5 should not be less than the longitudinal influence range of the active fault, and adjacent prestressed steel rod rings should overlap and be staggered. The prestressed steel rods 5 are tensioned after the first and second anchor seats 3 and 4 are welded, and the maximum tensioning force matches the ultimate strength standard value.

[0041] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0042] 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An earthquake-resistant structure provided on the surface of a shield segment in an earthquake-active fault zone, characterized in that: The invention comprises a plurality of shield segments located in an earthquake active fault zone, wherein a plurality of prestressed steel rods are provided on the inner surface of the shield segment, each of the prestressed steel rods extends along the length direction of the shield tunnel, and both ends of each prestressed steel rod along the length direction of the shield tunnel are fixed to the shield segment, and the prestressed steel rods are distributed at intervals along the circumference of the shield tunnel, and each of the prestressed steel rods is arranged above the lane layer, and both ends of each prestressed steel rod along the length direction of the shield tunnel are fixed to the shield segment through a first anchor seat, and the prestressed steel rod is welded to the first anchor seat, and a first embedded steel plate is provided on the inner surface of the shield segment fixedly connected to the end of the prestressed steel rod along the length direction of the shield tunnel, and the first anchor seat is welded and fixed to the first embedded steel plate The prestressed steel rods are arranged at intervals along the circumferential direction of the shield tunnel to form prestressed steel rod rings. The prestressed steel rod rings are overlapped with adjacent prestressed steel rod rings and arranged in a staggered manner. Along the length direction of the shield tunnel, the prestressed steel rods are overlapped with adjacent prestressed steel rods. A second prestressed steel plate is also provided on the inner surface of the shield segment with a first pre-embedded steel plate. A second anchor seat is welded on the second pre-embedded steel plate. The ends of adjacent prestressed steel rods are welded to the second anchor seat. Several first anchor seats are welded on the first pre-embedded steel plate, and several second anchor seats are welded on the second pre-embedded steel plate. Along the circumferential direction of the shield tunnel, the first anchor seats and the second anchor seats are arranged in a staggered manner. The edges of the first pre-embedded steel plate and the second pre-embedded steel plate are both kept a certain distance from the circumferential joint of the shield segment.

2. The seismic resistant structure provided on the surface of a shield segment in an earthquake active fault zone according to claim 1, characterized in that: The first embedded steel plate is a curved steel plate.

3. The seismic resistant structure provided on the surface of a shield segment in a seismic active fault zone according to claim 1, characterized in that: The first anchor seat is formed by welding a plurality of anchor seat steel plates, and the anchor seat steel plates extending along the circumferential direction of the shield tunnel are provided with steel rod holes for prestressed steel rods to pass through for tensioning.

4. A method for implementing the seismic resistant structure provided on the surface of a shield segment in an active seismic fault zone according to any one of claims 1 to 3, characterized in that: include S1. After the shield segments are assembled, the first anchor seat is welded to the first embedded steel plate according to a certain circumferential distance and longitudinal length, and the second anchor seat is welded to the second embedded steel plate according to a certain circumferential distance and longitudinal length; S2. Prestressed steel rods are tensioned through the welded first anchor seat and the second anchor seat to form prestressed steel rod rings along the circumferential direction of the shield tunnel. The prestressed steel rod rings are overlapped with adjacent prestressed steel rod rings and arranged in a staggered manner.

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