Prestress corrugated steel plate reinforced shield segment structure

Abstract

The utility model provides a prestressed corrugated steel plate reinforced shield segment structure. The prestressed corrugated steel plate reinforced shield segment structure comprises an arch crown corrugated steel plate, a left side arch shoulder corrugated steel plate, a right side arch shoulder corrugated steel plate, a left side haunch corrugated steel plate, a right side haunch corrugated steel plate, a left side bracket, a right side bracket, a ballast bed steel plate, a hinge bolt, a prestressed steel strand, a prestressed tension support and a prestressed anchorage device. Every two adjacent arc-shaped corrugated steel plates are connected through a hinge bolt, prestressed tension supports are symmetrically arranged on the two sides of a joint of the corrugated steel plates, prestressed steel strands are anchored to the two ends of the supports through single-hole prestressed anchorage devices, and all the corrugated steel plates are connected to form a collaboratively stressed whole. The steel corbel at the bottom of the reinforcing structure provides reliable support for the upper corrugated steel plate. The shield segment is light in weight, large in out-of-plane rigidity, high in buckling resistance, easy to produce and machine and convenient to construct and install, the bearing capacity and deformation resistance of the shield segment structure are remarkably improved by applying prestress to the arc-shaped corrugated steel plates, and convergence deformation of the segment is restrained.

Description

Technical Field

[0001] The utility model relates to the field of shield tunnel lining structure reinforcement, in particular to a prestressed corrugated steel plate reinforced shield segment structure. Background Art

[0002] Due to the complex underground space environment where the shield tunnel is located, the lining segment structure not only bears huge earth pressure and ground overload, but also bears the dynamic effects of groundwater seepage and vibration loads of operating vehicles. After several years of service, due to material degradation, the shield tunnel lining segments will inevitably have cracks, water leakage, settlement, convergence deformation and other defects. Among them, the continuous development of convergence deformation will have serious impacts on operational safety and structural safety. It is very necessary to take reinforcement and remediation measures for the shield segments whose convergence deformation exceeds the requirements of the specifications.

[0003] At present, the method of welding, assembling and pasting arc steel plates on the inner wall surface of the segment is commonly used to reinforce the tunnel lining structure, but the improvement of the bearing capacity and deformation resistance of the lining structure is limited. The utility model provides a prestressed corrugated steel plate reinforced shield segment structure, which adopts corrugated steel plates and prestressing technology. The corrugated steel plate has higher bearing capacity, greater out-of-plane stiffness, and higher out-of-plane buckling resistance than the smooth steel plate, and can effectively control the convergence deformation of the lining structure. Prestress is applied to the corrugated steel plate, and the arc-shaped corrugated steel plate generates annular support force for the shield segment, which can provide stronger support for the shield segment than ordinary steel plates. The corrugated steel plate and the segment work together to significantly improve the bending bearing capacity and deformation resistance of the lining structure, reduce the convergence deformation to meet the requirements of the specification, and have a good treatment effect on the convergence deformation of the shield lining structure. Summary of the invention

[0004] In order to achieve the above technical objectives, the utility model provides a prestressed corrugated steel plate reinforced shield segment structure, including arc-shaped corrugated steel plates installed and spliced ​​along the inner surface of the shield lining segment, hinged bolts, prestressed steel strands, prestressed tensioning supports, prestressed anchors, steel corrugated steel plates for supporting the prestressed corrugated steel plates, and roadbed steel plates.

[0005] Furthermore, hinge bolts are arranged at both ends of each arc-shaped corrugated steel plate, and adjacent corrugated steel rings are connected as a force-bearing whole through the hinge bolts, so that the connecting parts of the corrugated steel plates are hinged.

[0006] Furthermore, the prestressed steel strand anchor support is installed on the surface of the corrugated steel plate through high-strength bolts. The high-strength bolts penetrate the corrugated steel plate and are implanted in the segment concrete, connecting the prestressed anchor support, corrugated steel plate and shield segment as one. The prestressed steel strand is anchored at both ends of the support through anchors.

[0007] Furthermore, prestress is applied to each arc-shaped corrugated steel plate through the prestressing tensioning devices at both ends of the corrugated steel plate, and the magnitude of the prestress is determined by the tensioning amount that the arc-shaped corrugated steel plate can withstand.

[0008] Furthermore, the circular corrugated steel plate reinforcement structure is composed of five sections of arc-shaped corrugated steel plates, including a vault corrugated steel plate, two shoulder corrugated steel plates symmetrically installed, and two waist corrugated steel plates symmetrically installed.

[0009] Furthermore, a certain spacing is left between adjacent corrugated steel plates, the size of which is determined by the required tensioning amount of the corrugated steel plates and the hinge bolts between adjacent corrugated steel plates, and the reserved gaps are filled with epoxy putty.

[0010] Furthermore, steel brackets are arranged at the bottom of both ends of the prestressed corrugated steel plate reinforcement structure to provide reliable support for the upper corrugated steel plate, and the steel brackets are composed of corrugated steel plates and steel ribs.

[0011] The above-mentioned shield segment reinforcement structure adopts corrugated steel plates, which have the advantages of large out-of-plane stiffness, high strength, large bearing capacity, and strong out-of-plane buckling resistance. The application of prestress provides annular support force to the shield segment. The corrugated steel plate has a stronger supporting effect, which can effectively control the convergence and deformation of the shield segment and improve the bearing capacity of the shield lining structure. It has the advantages of both corrugated steel plates and prestressed technology, and has a better effect of controlling the convergence and deformation of the segment than ordinary smooth circular steel plates. The prestressed corrugated steel plate reinforced shield segment structure is simple to produce and process, convenient for transportation and construction, and has good overall force performance. The prestressed device is easy to manufacture and install, and the specifications and dimensions of the corrugated steel plate can be adjusted according to the actual segment size and disease conditions. The corrugated steel plate and the shield segment form an integral structure to bear force synergistically. The application of prestress significantly improves the bearing capacity, bending stiffness and deformation resistance of the tunnel lining structure, and controls the convergence and deformation of the shield tunnel structure within the allowable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the lining structure reinforcement of the utility model

[0013] Figure 2 This is a schematic diagram of the prestressed device of the utility model

[0014] Figure 3 This is a schematic diagram of the corbel bracket of the utility model

[0015] Figure 4 This is a schematic diagram of a single arc-shaped corrugated steel plate of the utility model. DETAILED DESCRIPTION

[0016] The structural features and implementation process of the utility model are further described in detail below in conjunction with the accompanying drawings and implementation cases, so as to facilitate the application of relevant engineering and technical personnel in specific projects for the treatment of shield tunnel lining structure defects.

[0017] As shown in the figure, the utility model comprises: a shield segment (1), a crown corrugated steel plate (2), a left shoulder corrugated steel plate (3), a right shoulder corrugated steel plate (4), a left waist corrugated steel plate (5), a right waist corrugated steel plate (6), a left corbel (7), a right corbel (8), a ballast steel plate (9), a hinge bolt (10), a prestressed steel strand (11), a prestressed tensioning support (12), a prestressed anchor (13), a corbel corrugated steel plate (14), a corbel vertical stiffening rib (15), a corbel transverse stiffening rib (16), and a corbel ring rib plate (17).

[0018] Corrugated steel plates are laid along the inner walls of shield tunnel segments to increase the rigidity of the segment cross-section, improve the bearing capacity and deformation resistance of the lining structure, and apply prestress to provide reliable support for the shield segments, improve the stress state of the shield segments, and effectively control the convergence deformation of the lining structure beyond the allowable range.

[0019] In order to realize the hinged connection between two adjacent corrugated steel plates, long bolt holes are set on both sides of each corrugated steel plate, and high-strength bolts are used to connect through the bolt holes to form a hinge. When prestressing is applied, each corrugated steel plate can slide relative to each other, and the hinge bolts have a certain regulating and buffering effect on the tension of the corrugated steel plate.

[0020] Prestressed tensioning devices are provided at the connection parts of each corrugated steel plate. Prestressed tensioning supports are symmetrically arranged along the spliced ​​annular seams of the corrugated steel plates. Prestressed steel strands are anchored at both ends of the supports. Prestress can be transferred to each corrugated steel plate through the tensioning supports.

[0021] The specific implementation steps are as follows:

[0022] 1. Before installing the prestressed corrugated steel plate, the shield segment (1) needs to be pre-treated. First, the stains and debris on the surface of the segment, as well as the cement fragments that appeared during the repair and plugging process of the segment, should be cleaned to keep the curvature of the construction working surface of the inner wall of the segment flat, clean and tidy, and free of water leakage. In order to enhance the bonding force between the corrugated steel plate and the concrete base of the segment, the segment construction working surface should be treated with a concrete interface agent, the segment hand hole should be sealed and densely sealed with micro-expanded fine stone concrete, and the concrete residue on the inner surface of the segment should be cleaned to ensure that the inner surface of the segment is clean, smooth and flat.

[0023] 2. After the measurement confirms that the clearance inside the tunnel is within the limit range, the corrugated steel plate and prestressing can be installed. First, the roadbed is cut and chiseled. In order to ensure a sufficiently large reinforcement cross section, the roadbed is cut as much as possible without moving the sleepers and tracks. The roadbed and ditch within the range of 1.2m from the center of the roadbed are all cut and chiseled, and the vertical depth of the cutting is to the inner wall surface of the shield tunnel segment. In order to ensure a firm bond between the corrugated steel plate and the upper corrugated steel plate, it is necessary to roughen the concrete on the side of the roadbed and the inner surface of the segment after cutting within the range of the corrugated steel plate bracket.

[0024] 3. Use M16 high-strength expansion bolts to install the ballast steel plate (9) on the ballast. The length of the bolts embedded in the concrete is 150 mm. Epoxy resin is injected into the gap between the ballast steel plate and the ballast surface through the grouting holes reserved on the ballast steel plate. The ballast steel plate and the upper corrugated steel plate form a complete force-bearing whole.

[0025] 4. According to the actual measured size after the ballast is cut, the brackets (7 and 8) are processed on site, and the brackets are anchored on the segments with M16 high-strength expansion bolts. The length of the bolts embedded in the concrete is 150mm. After the brackets are installed, epoxy resin is injected into the gaps between the brackets and the side walls of the ballast and the surface of the segments through the grouting holes reserved on the bracket brackets. Figure 3 shown.

[0026] 5. According to the actual measured dimensions after the installation of the brackets, the arch haunches (5 and 6), arch shoulders (3 and 4) and the arch crown corrugated steel plates (2) are processed and installed on site. The arch haunches, arch shoulders and arch crown corrugated steel plates are anchored to the pipe segments in a symmetrical installation order from bottom to top using M16 high-strength expansion bolts. The adjacent corrugated steel plates are connected to each other by hinge bolts (10) passing through the bolt holes on both sides of the corrugated steel plates. When assembling, a certain distance is reserved between the adjacent corrugated steel plates. The reserved distance is equal to the designed tension of the corrugated steel plates. The reserved joints are sealed with epoxy putty.

[0027] 6. After the corrugated steel plates of the corrugated legs, arch haunches, arch shoulders and arch crowns are all installed in place, a prestressed tensioning device is installed at the connection part of the steel ring. The prestressed tensioning support (12) is symmetrically arranged along the steel ring splicing ring seam. The support is connected to the corrugated steel plate and the pipe segment through high-strength expansion bolts. The two ends of the prestressed steel strand (11) are anchored on the support through a single-hole prestressed anchor (13), thereby connecting each piece of corrugated steel plate into a complete and coordinated force-bearing whole. The tensioned prestressed steel strand applies prestress to the corrugated steel plate through the supports at both ends. When the tension of the corrugated steel plate reaches a preset value, the tensioning is stopped. The tensioning force generated by the corrugated steel plate plays a reinforcing and supporting role for the shield pipe segment with large convergence deformation, thereby reducing the convergence deformation of the tunnel lining structure.

[0028] 7. After connecting the various parts of the corrugated steel plates into a whole and applying prestress, the surface of the corrugated steel plates is treated with a spray-type polyurea elastomer coating for corrosion and rust prevention. The coating needs to be layered and the thickness of each part must be uniform. The total coating thickness should not be less than 1.5mm.

[0029] 8. After anti-corrosion treatment, epoxy resin needs to be injected into the gap between the grooves of the corrugated steel plate and the segments in time. Grouting holes should be reserved for each corrugated steel plate. The edges on both sides of the corrugated steel plate and the joints of the segments need to be sealed with epoxy putty.

[0030] The prestressed corrugated steel plate reinforced shield segment structure is simple to produce and process, easy to transport and construct, has good overall stress performance, and the prestressed device is easy to manufacture and install. The specifications and dimensions of the corrugated steel plate can be adjusted according to the actual segment size and disease conditions. The corrugated steel plate and the shield segment form an integral structure to bear stress synergistically. The application of prestress significantly improves the bending bearing capacity, buckling resistance and deformation resistance of the tunnel lining structure, and controls the convergence deformation of the shield tunnel structure within the allowable range.

[0031] The above technical measures are only preferred implementation methods of the present utility model. It is pointed out here that the improvements and changes made thereto on the basis of the present utility model should also be regarded as within the protection scope of the present utility model.

Claims

1. A prestressed corrugated steel plate reinforced shield segment structure, characterized by: The reinforcement structure includes an arch crown corrugated steel plate, a left arch shoulder corrugated steel plate, a right arch shoulder corrugated steel plate, a left arch waist corrugated steel plate, a right arch waist corrugated steel plate, a left corrugated steel plate, a right corrugated steel plate, and a roadbed steel plate. The connection between two adjacent arc-shaped corrugated steel plates is hinged. Prestressed tensioning supports are symmetrically arranged on both sides of the joint of the corrugated steel plates. The prestressed steel strands are anchored at both ends of the supports to connect the corrugated steel plates to form a coordinated force-bearing whole. The steel corrugated steel plate at the bottom of the reinforcement structure provides reliable support for the upper corrugated steel plate.

2. The prestressed corrugated steel plate reinforced shield segment structure according to claim 1 is characterized by: Both ends of each corrugated steel plate are provided with hinge bolt holes, through which high-strength bolts are used to connect adjacent corrugated steel plates, so that a hinge is formed between them, which can produce relative rotation and displacement. The hinge bolts can adjust and buffer the tensioning amount of the arc-shaped corrugated steel plate.

3. The prestressed corrugated steel plate reinforced shield segment structure according to claim 1 is characterized by: The prestressed tensioning supports are symmetrically installed on both sides of the corrugated steel plate joints through high-strength bolts. The high-strength bolts penetrate the corrugated steel plates and are embedded in the segment concrete. The prestressed steel strands are tensioned to a predetermined value and anchored at both ends of the supports through anchors.

4. The prestressed corrugated steel plate reinforced shield segment structure according to claim 1 is characterized by: Prestress is applied to the curved corrugated steel plate through the prestressed tensioning device at both ends of the corrugated steel plate. The prestressed tensioning device consists of a tensioning support, a prestressed anchor, and a prestressed steel strand. The prestress generated by the tensioning steel strand is transmitted to the curved corrugated steel plate through the support. The size of the prestress is determined by the tension that the curved corrugated steel plate can withstand.

5. The prestressed corrugated steel plate reinforced shield segment structure according to claim 1 is characterized by: Steel brackets are arranged at the bottom of both ends of the prestressed corrugated steel plate reinforcement structure to provide reliable support for the upper arc-shaped corrugated steel plate. The steel brackets are composed of corrugated steel plates and steel ribs.

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