Steel shell concrete pipe segment structure for active fault zone and installation method

Abstract

The application relates to the technical field of tunnel safety, and discloses a steel shell concrete segment structure for an active fracture zone and a mounting method, which comprises a plurality of annular steel shell concrete segments which are bolt-connected in a longitudinal direction, the annular steel shell concrete segment comprises an outer steel shell and an inner steel shell, the side surface of the outer steel shell is provided with vertical steel plates, bolt holes are arranged on the vertical steel plates, the two side vertical steel plates of adjacent outer steel shells are aligned and connected through bolts to form an outer annular ring; the inner surface of the outer steel shell is welded with a stiffened steel plate, the free end of the stiffened steel plate is welded with the outer surface of the inner steel shell, the stiffened steel plate away from the end of the annular steel shell concrete segment is provided with a hole for concrete flow, and the inner steel shell is provided with a grouting hole for pouring concrete. The scheme is suitable for the active fracture zone, can resist large water pressure, is convenient to construct, has high anti-disconnection capacity, good waterproof effect, high connecting rigidity and integrity, high strength, good ductility, and can simultaneously play the advantages of concrete and steel.

Description

Technical Field

[0001] This invention relates to the field of tunnel safety technology, specifically to a steel-shell concrete segment structure and installation method for active fracture zones. Background Technology

[0002] In recent years, there have been increasingly higher requirements for the development of underground space. With the advancement of technology, the need for underground space development under complex geological conditions has become more and more urgent. In areas with relatively complex geological conditions, phenomena such as fault displacement often occur. Therefore, the study of tunnel anti-fault design is of great significance.

[0003] Traditional concrete tunnel lining segments suffer from insufficient ductility, cumbersome construction processes, and low production efficiency. Therefore, patents CN211422668U and CN110130942U disclose two types of steel tunnel lining segments, solving problems such as the complexity of concrete tunnel lining segment construction.

[0004] Although the steel segments used above have high strength, good ductility, and light weight, they also have problems such as high cost and poor corrosion resistance. Patent CN210317329U discloses an all-steel concrete shield tunnel segment, but the construction of this patent is not simplified, and it does not take into account the impact of fault displacement, the waterproofing problem in high-pressure water environments, and the connection method is not clear.

[0005] The aforementioned patents only study single concrete or steel segments, failing to consider segments forming composite structures with both concrete and steel, and are only applicable to geologically favorable environments. However, in areas with complex geological conditions, fault displacement and high-pressure water environments exist, and there are no effective fault-resistant measures to ensure structural safety. Therefore, there is a need to invent a convenient steel-shell concrete segment structure and assembly method suitable for active fault zones and capable of withstanding high water pressure. Summary of the Invention

[0006] This invention provides a steel-shell concrete segment structure and installation method for active fault zones, solving the technical problem mentioned above that there are no good anti-fault measures to ensure structural safety in environments with fault displacement and high-pressure water.

[0007] To solve the above-mentioned technical problems, the present invention provides a steel-shell concrete segment structure for active fracture zones, comprising multiple annular steel-shell concrete segments connected by bolts at both ends along the longitudinal direction. The annular steel-shell concrete segment includes an outer steel shell and an inner steel shell. The side of the outer steel shell is provided with a vertical steel plate, and the vertical steel plate is provided with bolt holes. The two sides of the vertical steel plates of the adjacent outer steel shell are aligned and connected by bolts to form an outer ring.

[0008] The inner surface of the outer steel shell is welded with a stiffening steel plate, the free end of which is welded to the outer surface of the inner steel shell. The stiffening steel plate, located away from the end of the concrete pipe segment of the annular steel shell, is provided with a circular hole for concrete flow. The inner steel shell is provided with a grouting hole for pouring concrete.

[0009] Preferably, the stiffening steel plate includes a longitudinally arranged longitudinal stiffening steel plate and a transversely arranged transverse stiffening steel plate.

[0010] Preferably, the steel-shell concrete segment structure further includes a U-shaped steel plate groove, which wraps around the vertical steel plates of two adjacent outer steel shells and connects them with bolts.

[0011] Preferably, the U-shaped steel plate groove is provided with a water-swellable rubber waterstop pad.

[0012] Preferably, the outer steel shell has a side plate at its end, and the side plate has bolt holes. The side plates at the ends of the outer steel shells of two adjacent annular steel shell concrete pipe segments are connected by bolts.

[0013] Preferably, the stiffening steel of the vertical steel plate of the outer steel shell closest to the annular steel shell concrete pipe segment is not provided with holes, so as to ensure that a flexible area is formed between the vertical steel plate of the outer steel shell of the annular steel shell concrete pipe segment and the closest stiffening steel plate, and this flexible area is not grouted.

[0014] This invention provides a method for installing a steel-shell concrete segment structure for active fault zones. The method includes the following steps:

[0015] S1, a stiffening steel plate is welded to the inner surface of each outer steel shell, and a vertical steel plate is provided on the side of the outer steel shell. The vertical steel plate is provided with bolt holes. The two vertical steel plates of the adjacent outer steel shells are aligned and connected by bolts to form an outer ring.

[0016] S2, the corresponding inner steel shell is welded to the free end of the stiffening steel plate to form an inner ring. The concrete is poured through the pouring hole of the inner steel shell. The concrete flows through the circular hole of the stiffening steel plate and finally fills the sealed space formed by the inner ring, the outer ring and the stiffening steel plate to obtain a ring steel shell concrete segment.

[0017] S3, the steel shell concrete segment structure is obtained by connecting the first and last ends of multiple ring steel shell concrete segments with bolts.

[0018] Beneficial Effects: This invention provides a steel-shell concrete segment structure and installation method for active fault zones, comprising multiple annular steel-shell concrete segments connected longitudinally by bolts. Each annular steel-shell concrete segment includes an outer steel shell and an inner steel shell. Vertical steel plates are provided on the sides of the outer steel shell, and bolt holes are provided on these plates. The vertical steel plates on adjacent sides of the outer steel shell are aligned and connected by bolts to form an outer ring. A stiffening steel plate is welded to the inner surface of the outer steel shell, and the free end of the stiffening steel plate is welded to the outer surface of the inner steel shell. Holes for concrete flow are provided on the stiffening steel plate away from the end of the annular steel-shell concrete segment. Grouting holes for pouring concrete are provided on the inner steel shell. This solution is suitable for active fault zones, can withstand high water pressure, and is easy to construct. It combines the advantages of both concrete and steel, and has good corrosion resistance. Furthermore, it meets the requirements of strong resistance to fracture, good waterproofing, strong connection rigidity and integrity, high strength, and good ductility, thus simultaneously leveraging the advantages of both concrete and steel.

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This is a perspective view of the steel-shell concrete segment structure for active fracture zones according to the present invention.

[0022] Figure 2 This is a schematic diagram of the end face of the annular steel shell concrete segment of the present invention;

[0023] Figure 3 This is a cross-sectional view of the annular steel shell concrete segment of the present invention;

[0024] Figure 4 This is a connection diagram of two adjacent outer steel shells of the present invention;

[0025] Figure 5 This is a diagram showing the connection between the outer steel shell stiffening steel plate and the stiffening steel plate of the present invention;

[0026] Figure 6 This is a plan view of the steel-shell concrete segment structure for active fracture zones according to the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1. Outer steel shell; 2. Inner steel shell; 3. Enclosed space; 4. Longitudinal stiffening steel plate; 5. Transverse stiffening steel plate; 6. U-shaped steel plate groove; 7. Side plate; 8. Vertical steel plate; 9. Circular hole; 10. Water-swellable rubber waterstop; 11. Flexible area; 12. Grouting hole. Detailed Implementation

[0028] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0029] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] like Figures 1 to 6As shown, the present invention provides a steel-shell concrete segment structure and installation method for active fracture zones, comprising multiple annular steel-shell concrete segments connected longitudinally by bolts. The annular steel-shell concrete segment includes an outer steel shell 1 and an inner steel shell 2. The outer steel shell 1 has vertical steel plates 8 on its side, and bolt holes are provided on the vertical steel plates 8. The vertical steel plates 8 on the two sides of the adjacent outer steel shell 1 are aligned and connected by bolts to form an outer ring. A stiffening steel plate is welded to the inner surface of the outer steel shell 1, and the free end of the stiffening steel plate is welded to the outer surface of the inner steel shell 2. The stiffening steel plate away from the end of the annular steel-shell concrete segment has holes for concrete flow. The inner steel shell 2 has grouting holes 12 for pouring concrete. This solution is suitable for active fault zones and can withstand high water pressure. It is easy to construct and combines the advantages of both concrete and steel, with good corrosion resistance. It also meets the requirements of strong resistance to fracture, good waterproofing, strong connection rigidity and integrity, high strength, and good ductility, thus leveraging the advantages of both concrete and steel.

[0032] Specifically, the novel steel-shell concrete segment structure is assembled from several parts. This embodiment uses a six-part assembly as an example. In other implementation scenarios, it can also consist of four or three parts, assembled at different angles to form a complete circle.

[0033] The entire steel-shell concrete segment is divided into six equal parts at 60° intervals. Each part has a 60° arc-shaped structure. It can also be divided into several parts at different angles. During installation, the six outer steel shells 1 are first connected into a whole, with each outer steel shell 1 equipped with a stiffening steel plate. Then, the six inner steel shells 2 are welded to the stiffening steel plates attached to the outer steel shells 1, forming a closed annular space. Concrete is then poured into the annular space formed by the inner steel shells 2 and the outer steel shells 1. During pouring, concrete is injected through the pouring holes on the inner steel shells 2, and the concrete flows through the circular holes 9 on the stiffening steel plates into different spaces until it fills the space between the outer steel shells 1 and the inner steel shells 2.

[0034] A further embodiment includes a vertical steel plate 8 on the end face of the outer steel shell 1, with bolt holes on the vertical steel plate 8. The two vertical steel plates 8 of the outer steel shell 1 are connected by bolts. During connection, the two vertical steel plates 8 of the two outer steel shells 1 are aligned, and then a U-shaped steel plate groove 6 is used to wrap around the two outer steel shells 1. Bolt holes are provided along the longitudinal direction of the outer steel shell 1 on both sides of the vertical steel plates 8 and on the U-shaped steel plate groove 6, and a water-swellable rubber waterproofing pad 10 is installed inside the U-shaped steel plate groove 6 as a waterproofing measure. After connecting these six parts of the outer steel shell 1 end to end, high-strength bolts are inserted into the bolt holes to secure them firmly, completing the connection between the outer steel shells 1, forming a ring of outer steel shell 1.

[0035] In a preferred embodiment, stiffening steel plates are welded to the inner surface of the outer steel shell 1, including longitudinally arranged longitudinal stiffening steel plates 4 and transversely arranged transverse stiffening steel plates 5. Each stiffening steel plate has circular holes to allow concrete to flow within the space inside the steel shell during pouring. After the six outer steel shells 1 are assembled to form a complete circular outer steel shell 1, the inner steel shell 2 is welded to the stiffening steel plates on the outer steel shell 1. After the six inner steel shells 2 are welded, a closed annular space is formed between the two rings, the outer steel shell 1 and the inner steel shell 2. A grouting hole 12 is left in the middle of the inner steel shell 2 for grouting after assembly. After grouting is completed, one ring of steel shell concrete segment is finished.

[0036] In a further preferred embodiment, the end stiffening steel plates (i.e., boundary stiffening steel plates) do not have circular holes 9, so that the two end stiffening steel plates form a closed space 3, which is not filled with grout. Because the area between the end stiffening steel plates and the side steel plates is not filled with concrete, this area can be used as a flexible area 11.

[0037] For the connection between steel-shell concrete segments, the method is the same as that for the connection between steel shells. U-shaped steel plate grooves 6 are used to wrap both sides of the segment, and bolts are used for assembly. Water-swellable rubber waterstops are installed on the inner side as a waterproofing measure. No grouting is performed between the side plates 7 of the outer steel shell 1 at both ends of each ring of steel-shell concrete segments and the first stiffening steel plate. This creates a flexible region 11 between each steel-shell concrete segment with a stiffness much lower than that of concrete, ensuring the articulated design of the tunnel.

[0038] In a specific implementation scenario:

[0039] 1. First, connect the 6 outer steel shells 1 together in sequence. The last outer steel shell 1 is inserted into the already connected part along the longitudinal direction of the tunnel to form an outer ring. The spacing of the stiffening steel plates and the opening of the stiffening steel plates of the outer steel shell 1 can be changed according to different working conditions.

[0040] 2. Use a U-shaped steel plate groove 6 to wrap the part connecting the outer steel shell 1 with the outer steel shell 1, and make a water-swellable rubber waterstop pad 10 inside. Use high-strength bolts to connect the 6 outer steel shells 1 together to provide pre-tightening force and ensure the stability of the connection between the outer steel shells 1 and the outer steel shell 1.

[0041] 3. Weld the inner steel shell 2 to the reinforcing steel plate of the outer steel shell 1, and weld the inner steel shell 2 to itself, so that the inner steel shell 2 and the outer steel shell 1 together form a ring-shaped space.

[0042] 4. Grout is injected into the annular space formed between the inner steel shell 2 and the outer steel shell 1 through grouting holes 12. The concrete will flow through the circular holes in the reinforcing steel plate and eventually fill the entire space. This results in a complete annular steel shell concrete segment. No grouting is performed on the two side boundaries of each annular segment.

[0043] 5. After grouting is completed, continue assembling the next ring of steel-shell concrete segments. After assembling the two rings of steel-shell concrete segments together, connect the segments to each other using bolts. Finally, the selection of bolts, concrete, waterstop pads, and whether to fill the ungrouted flexible area 11 with flexible material depends on the specific design requirements.

[0044] Compared with the prior art, the main advantages of this invention include:

[0045] 1. This invention adopts a tunnel articulated design, which has strong resistance to slippage, is suitable for active fault zones, and is easy to install and has a fast construction speed.

[0046] 2. This invention designs a novel steel-shell concrete segment that combines the advantages of both concrete and steel. It has good ductility, and the concrete encases the bolts connecting the steel shells, ensuring that the bolts are not corroded and increasing the durability of the structure.

[0047] 3. The present invention uses a combined structure of steel shell and concrete to jointly bear the load. This structure has high strength, good ductility, and is easy to construct, without the need for steel reinforcement.

[0048] 4. This invention designs a method for assembling steel-shell concrete pipe segments together. This method can ensure that there is a flexible connection layer between the pipe segments. When ground displacement occurs, this flexible layer can greatly resist the impact of ground deformation.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A steel-shell concrete segment structure for active fault zones, characterized in that, It includes multiple longitudinally connected end-to-end bolted ring steel shell concrete segments, each ring steel shell concrete segment comprising an outer steel shell and an inner steel shell. The outer steel shell has vertical steel plates on its side, and bolt holes are provided on the vertical steel plates. The two sides of the adjacent outer steel shells are aligned and connected by bolts to form an outer ring. The inner surface of the outer steel shell is welded with a stiffening steel plate, the free end of the stiffening steel plate is welded to the outer surface of the inner steel shell, and the stiffening steel plate away from the end of the concrete tube segment of the annular steel shell is provided with a circular hole for concrete flow. The inner steel shell is provided with a grouting hole for pouring concrete. The stiffening steel plate includes longitudinally arranged longitudinal stiffening steel plates and transversely arranged transverse stiffening steel plates; One end of the longitudinal stiffening steel plate is connected to the outer steel shell, and the other end is connected to the inner steel shell. The two ends of the transverse stiffening steel plate in the radial direction of the tunnel are respectively connected to the outer steel shell and the inner steel shell, and the two ends in the circumferential direction of the tunnel are respectively connected to two adjacent longitudinal stiffening steel plates. The multiple longitudinal stiffening steel plates and the multiple transverse stiffening steel plates enclose and form a grid-shaped cavity. The adjacent cavities are connected through the circular holes. The steel-shell concrete segment structure also includes a U-shaped steel plate groove, which wraps the vertical steel plates of two adjacent outer steel shells and connects them with bolts. No holes are provided on the stiffening steel of the vertical steel plate of the outer steel shell closest to the annular steel shell concrete pipe segment, so as to ensure that a flexible area is formed between the vertical steel plate of the outer steel shell of the annular steel shell concrete pipe segment and the closest stiffening steel plate, and this flexible area is not grouted. The U-shaped steel plate channel is located within the flexible area.

2. The steel-shell concrete segment structure for active fault zones according to claim 1, characterized in that, The U-shaped steel plate groove is equipped with a water-swellable rubber waterstop pad.

3. The steel-shell concrete segment structure for active fault zones according to claim 1, characterized in that, The outer steel shell is provided with a side plate at its end, and the side plate is provided with bolt holes. The side plates at the ends of the outer steel shells of two adjacent annular steel shell concrete pipe segments are connected by bolts.

4. A method for installing a steel-shell concrete segment structure in an active fault zone, characterized in that, The installation method is used to implement the installation of the steel-shell concrete segment structure for active fracture zones as described in any one of claims 1-3, and includes the following steps: S1, a stiffening steel plate is welded to the inner surface of each outer steel shell, and a vertical steel plate is provided on the side of the outer steel shell. The vertical steel plate is provided with bolt holes. The two vertical steel plates of the adjacent outer steel shells are aligned and connected by bolts to form an outer ring. S2, the corresponding inner steel shell is welded to the free end of the stiffening steel plate to form an inner ring. The concrete is poured from the pouring hole of the inner steel shell. The concrete flows through the circular hole of the stiffening steel plate and finally fills the sealed space formed by the inner ring, the outer ring and the stiffening steel plate to obtain a ring steel shell concrete segment. S3, the steel shell concrete segment structure is obtained by connecting the first and last ends of multiple ring steel shell concrete segments with bolts.

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