Steel-concrete composite structure system under heavy load condition of underground engineering

Abstract

The utility model discloses a steel-concrete combined composite structure system under the heavy load condition of underground engineering, which comprises a steel box type bearing member, a duct piece outer protection layer is arranged outside the steel box type bearing member, the duct piece outer protection layer and the steel box type bearing member are connected into a whole, a plurality of cavities are formed in the steel box type bearing member, and the cavities are communicated with the duct piece outer protection layer. The cavity is filled with internal filling concrete, and the internal filling concrete and a concrete protection layer in the duct piece outer protection layer jointly act inside and outside, so that the stability and the bearing capacity of the whole structure are enhanced. The high-performance concrete is filled in the steel box type bearing component, so that the bearing capacity of the duct piece can be greatly improved; an anti-cracking reinforcing mesh and a concrete protection layer are arranged outside the pipe piece, so that the durability of the pipe piece is greatly improved; the circular seams and the longitudinal seams of the duct pieces are connected through concrete, the duct pieces can adapt to connection modes of rabbets, grooves and the like of various molds, production through the molds is facilitated, the duct pieces are connected through special lap joint steel plates, and the integrality of the duct pieces is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of assembled tunnel engineering, and specifically relates to a steel-concrete composite structure system under heavy load conditions of underground engineering. Background Art

[0002] With the continuous expansion of urban rail transit construction, tunnel excavation technology has been widely used. During the tunnel construction process, due to the constraints of stations and existing buildings and structures, the tunnel line will inevitably have spatial conflicts with the existing pile foundation. In order to ensure the smooth implementation of tunnel construction, in the case of conflict between the tunnel structure and the pile foundation, the traditional reinforced concrete segments cannot bear the pile foundation load and the steel segments are not durable enough in the hot and humid environment of water and soil. Therefore, the commonly used method is to modify the line to avoid obstacles, remove the upper structures of the pile foundation, or replace the pile foundation to reduce the construction risk. However, on the one hand, in daily engineering applications, due to the influence of many risk sources of tunnel lines, the operational space for modifying the route is further compressed, and the modification of the line is often accompanied by an increase in investment and construction period; on the other hand, the measures of dismantling the upper structures of the pile foundation, rebuilding in situ after the shield passes, or using pile foundation replacement to ensure the smooth excavation of the shield are criticized for their huge cost and long construction period.

[0003] Therefore, there is an urgent need for a new type of composite segment system that can adapt to heavy load conditions, meet durability requirements, have universal cross-sections, improve construction efficiency, and reduce project costs. Summary of the invention

[0004] The utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide a steel-concrete composite structure system under heavy load conditions of underground engineering.

[0005] The technical solution of the utility model is: a steel-concrete composite structural system under heavy-load conditions of underground engineering, comprising a steel box-type load-bearing member, a segment outer protective layer is arranged outside the steel box-type load-bearing member, the segment outer protective layer and the steel box-type load-bearing member are connected as a whole, a plurality of cavities are formed inside the steel box-type load-bearing member, the cavities are filled with internal filling concrete, the internal filling concrete and the concrete protective layer in the segment outer protective layer act together inside and outside to enhance the stability and bearing capacity of the overall structure.

[0006] Furthermore, the outer protective layer of the pipe segment includes a concrete protective layer and an inner anti-cracking steel mesh, and the inner anti-cracking steel mesh is connected to a steel box-type load-bearing member.

[0007] Furthermore, the steel box-type load-bearing member is divided into a plurality of chambers, and the chambers can be filled with concrete.

[0008] Furthermore, the outer protective layer of the pipe segment and the steel box-type load-bearing member are assembled into a ring, and the steel box-type load-bearing member is connected in the circumferential direction through annular seams.

[0009] Furthermore, the annular seams are connected by filling with concrete, and the annular seams can be filled with tongues and grooves adapted to various molds.

[0010] Furthermore, the outer protective layer of the pipe segment and the steel box-type load-bearing member are connected longitudinally by longitudinal seams.

[0011] Furthermore, the longitudinal seams are connected by filling with concrete, and the longitudinal seams can be filled with tongues and grooves adapted to various molds.

[0012] Furthermore, hand holes are reserved in the steel box-type load-bearing member, and the hand holes in adjacent steel box-type load-bearing members correspond to each other.

[0013] Furthermore, a bent bolt is provided in an adjacent pair of hand holes, and the steel connection of adjacent steel box-type load-bearing components is achieved through the bent bolt.

[0014] The beneficial effects of the utility model are as follows:

[0015] The shield segment structure system of the utility model adopts a layered design in structure. The outermost layer is a reinforced concrete protective layer, which can not only effectively prevent the external environment from eroding the internal structure, but also absorb and disperse the external load to a certain extent, playing a preliminary protective role.

[0016] The middle layer of the utility model is a steel box-type load-bearing member, which is the core part of the entire structural system. The steel box-type load-bearing member is made of high-strength steel and has excellent load-bearing capacity and anti-deformation ability. Its design adopts a combination of circumferential and longitudinal steel ribs to form a solid box structure. This design enables the shield segment to effectively disperse the pressure when it is under heavy load, reducing the risk of excessive stress at a single point.

[0017] The interior of the utility model is filled with a concrete layer, and the high-performance concrete used has excellent compressive strength and durability. It is closely combined with the steel box-type load-bearing components to form an integrally stressed composite structure, further enhancing the overall stability of the shield segment.

[0018] In terms of materials, the utility model uses high-strength steel and high-performance concrete. High-strength steel has excellent tensile, compressive and shear resistance, and is an ideal material for manufacturing steel box-type load-bearing components. High-performance concrete has the characteristics of high strength, high durability and low permeability, and is very suitable as the outer material of the steel shell.

[0019] The utility model adopts specially made bent bolts and other high-strength connecting parts to ensure the close connection between the layers of the structure. This connection method not only ensures the integrity of the structure, but also can absorb and buffer the impact of external loads on the structure to a certain extent.

[0020] The utility model fully considers the safety and durability requirements of shield segments under heavy load conditions. By optimizing the structural design, selecting high-strength materials and adopting advanced connection methods, it ensures that the shield segments can maintain stable bearing capacity and anti-deformation ability during long-term use. In addition, the setting of the reinforced concrete protective layer further enhances the durability of the shield segments, enabling them to resist erosion in various harsh environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a top view of the utility model;

[0022] Figure 2 It is a schematic diagram of the annular structure of the utility model;

[0023] Figure 3 It is a schematic diagram of the longitudinal structure of the utility model;

[0024] Figure 4 It is a schematic diagram of overlapping steel plates in the utility model;

[0025] Figure 5 It is a detailed view of the bent bolt in the utility model;

[0026] in:

[0027] 1 Segment outer protective layer 2 Steel box-type load-bearing member

[0028] 3 Internal filling concrete 5 Overlap steel plate

[0029] 11 Concrete protective layer 12 Inner anti-crack steel mesh

[0030] 21 Circumferential steel ribs 22 Longitudinal steel ribs

[0031] 23 longitudinal half rib steel plate 24 outer edge steel plate

[0032] 25 Inner edge steel plate 26 Bolt

[0033] 41 bent bolt 42 hand hole. DETAILED DESCRIPTION

[0034] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0035] like Figures 1 to 5As shown, a steel-concrete composite structural system under heavy load conditions of underground engineering includes a steel box-type load-bearing member 2, and a segment outer protective layer 1 is arranged outside the steel box-type load-bearing member 2. The segment outer protective layer 1 and the steel box-type load-bearing member 2 are connected as a whole. A plurality of cavities are formed in the steel box-type load-bearing member 2, and the cavities are filled with internal filling concrete 3. The internal filling concrete 3 and the concrete protective layer 11 in the segment outer protective layer 1 work together internally and externally to enhance the stability and bearing capacity of the overall structure.

[0036] The outer protective layer 1 of the pipe segment includes a concrete protective layer 11 and an inner anti-cracking steel mesh 12 , and the inner anti-cracking steel mesh 12 is connected to the steel box-type load-bearing member 2 .

[0037] The steel box-type load-bearing member 2 is divided into a plurality of chambers, and the chambers can be filled with concrete 3 .

[0038] The outer protective layer 1 of the pipe segment and the steel box-type load-bearing member 2 are assembled into a ring, and the steel box-type load-bearing member 2 is connected in the circumferential direction through an annular seam.

[0039] The annular seams are connected by filling concrete, and the annular seams can be filled with tongues and grooves adapted to various molds.

[0040] The outer protective layer 1 of the pipe segment and the steel box-type load-bearing member 2 are connected longitudinally by longitudinal seams.

[0041] The longitudinal joints are connected by filling concrete, and the longitudinal joints can be filled with tongues and grooves adapted to various molds.

[0042] A hand hole 42 is reserved in the steel box-type load-bearing member 2 , and the hand holes 42 in adjacent steel box-type load-bearing members 2 correspond to each other.

[0043] A bent bolt 41 is provided in a pair of adjacent hand holes 42 , and the bent bolt 41 is used to realize the steel connection of adjacent steel box-type load-bearing components 2 .

[0044] Specifically, the steel box-type load-bearing member 2 includes an outer edge steel plate 24 and an inner edge steel plate 25 . The outer edge steel plate 24 and the inner edge steel plate 25 are both arc-shaped, and the outer edge steel plate 24 and the inner edge steel plate 25 are parallel to each other.

[0045] Specifically, an annular steel rib 21 for longitudinal unit separation is provided between the outer edge steel plate 24 and the inner edge steel plate 25 , and the annular steel rib 21 is an arc-shaped plate adapted to the distance between the outer edge steel plate 24 and the inner edge steel plate 25 .

[0046] Specifically, a longitudinal steel rib 22 for separating the annular units is provided between the outer edge steel plate 24 and the inner edge steel plate 25 . The longitudinal steel rib 22 is provided between the outer edge steel plate 24 and the inner edge steel plate 25 , and is perpendicular to both the outer edge steel plate 24 and the inner edge steel plate 25 .

[0047] Specifically, the box chamber is formed by enclosing an outer edge steel plate 24 , an inner edge steel plate 25 , an annular steel rib plate 21 , and a longitudinal steel rib plate 22 .

[0048] Specifically, Figure 2 As shown, the box type includes a large arc length box chamber, a medium arc length box chamber, and a small arc length box chamber. The difference between the large arc length box chamber, the medium arc length box chamber, and the small arc length box chamber is that the arc lengths of the three are different.

[0049] More specifically, for a box room with a small arc length, bolts 26 are provided on the inner side of the longitudinal steel ribs 22 to increase the structural strength.

[0050] More specifically, for the mid-arc long box room, a longitudinal half-rib steel plate 23 is provided on the inner edge steel plate 25, and the longitudinal half-rib steel plate 23 does not contact the outer edge steel plate 24. Both sides of the longitudinal half-rib steel plate 23 are provided with bolts 26 for increasing the structural strength.

[0051] More specifically, for a box chamber with a large arc length, a plurality of longitudinal half-rib steel plates 23 are arranged on the inner edge steel plate 25, and the longitudinal half-rib steel plates 23 are not in contact with the outer edge steel plate 24. The longitudinal half-rib steel plates 23 are provided with bolts 26 on one side to increase the structural strength.

[0052] Specific, combined Figure 2 In the annular direction, a hand hole 42 is opened in the large arc length box room and penetrates the longitudinal steel rib 22 on the side. In the annular direction, two adjacent hand holes 42 are connected in an arc shape, and the bent bolts 41 pass through the above two hand holes 42 for fixing.

[0053] Specific, combined Figure 3 In the longitudinal direction, the hand hole 42 is also opened in the wider box and penetrates the side annular steel rib 21. In the longitudinal direction, two adjacent hand holes 42 are connected in an arc shape, and the bent bolt 41 passes through the above two hand holes 42 for fixing.

[0054] Specifically, the concrete protective layer 11 covers the outer side of the steel box-type load-bearing member 2 to provide protection and enhance the durability of the structure; the steel box-type load-bearing member 2 is designed with reserved holes to facilitate precise positioning and quick connection; the internal filling concrete 3 is injected into the cavity of the steel box-type load-bearing member 2, and works together with the external concrete protective layer 11 to enhance the stability and bearing capacity of the overall structure, ensuring the close combination of each component.

[0055] Specifically, the concrete protective layer 11 includes concrete and an inner anti-cracking steel mesh 12 embedded therein to improve crack resistance and structural integrity. The inner anti-cracking steel mesh 12 is tightly combined with the steel box-type load-bearing member 2 through a specific connection method.

[0056] Specifically, the steel box-type load-bearing member 2 is composed of an annular steel rib 21 with reserved holes, a longitudinal steel rib 22 and other connecting steel plates to form a stable load-bearing frame, and the internal filling concrete 3 is tightly filled in the frame to jointly bear the load.

[0057] Specifically, Figure 4 As shown, overlapping steel plates 5 for connection are also provided between adjacent steel box-type load-bearing members 2. The inner edge steel plate 25 in the steel box-type load-bearing member 2 forms a structural protrusion, and an overlapping steel plate 5 connecting the two is provided at the protruding section of the inner edge steel plate 25. The overlapping steel plate 5 is fixed by welding.

[0058] The application scenarios of the utility model are areas in underground projects that need to withstand heavy load conditions, including but not limited to tunnels, subways, underground parking lots, etc. The structural system can adapt to a variety of heavy load environments and provide stable support and protection.

[0059] The design of the utility model allows application without changing the existing concrete mold, thereby improving the versatility and flexibility of the system.

[0060] The shield segment of the utility model adopts a steel-concrete composite structure, which is prefabricated by pouring concrete inside and outside the steel box-type load-bearing member 2. The steel box-type load-bearing member 2 includes an annular steel rib plate 21 and a longitudinal steel rib plate 22. According to the needs of concrete pouring, a reserved 120mm opening is set at the plate body of the annular steel rib plate 21 and the longitudinal steel rib plate 22, and a longitudinal half-rib steel plate 21 is provided at some positions. The longitudinal half-rib steel plate 21, the annular steel rib plate 21, the outer edge steel plate 24, and the inner edge steel plate 25 form a spatial box structure.

[0061] Specifically, bolts 26 are arranged inside the steel box-type load-bearing member 22, and the outer and inner anti-cracking steel meshes 12 are plug-welded to form a reliable connection, and then concrete is poured to form an outer reinforced concrete protective layer and an inner steel-concrete composite structure.

[0062] Specifically, after the assembly of the utility model is completed, the special overlapping steel plates 5 are welded on both sides to strengthen the connection between the rings, thereby increasing the integrity of the pipe segment.

[0063] In the utility model, the steel box-type load-bearing member 2 is tightly combined to form an integrally stressed composite structure, which is filled with high-performance concrete. Compared with the traditional reinforced concrete segment structure, the load-bearing capacity is greatly improved, and compared with the pure steel segment, the outer layer of the segment is provided with an inner anti-cracking steel mesh 12 and a concrete protective layer 11, which greatly enhances the anti-corrosion ability of the segment structure itself to resist harsh environmental conditions. The utility model can adapt to the tongue and groove connection forms of various molds, has good versatility, and is suitable for complex underground engineering environments under heavy load conditions. Moreover, the system can perfectly fit the generation of various molds without the need for separate molds, and has good versatility in engineering.

[0064] Specifically, Figure 1 As shown, the outer protective layer 1 of the segment includes a concrete protective layer 11 and an inner anti-cracking steel mesh 12, which is used to wrap and protect the internal steel structure. The inner anti-cracking steel mesh 12 has a diameter of 8 mm and a spacing of 150 mm. The steel plug is welded on the outer side of the outer edge steel plate 24, which can better ensure the anti-cracking effect of the concrete.

[0065] Specifically, Figure 2 and Figure 3 As shown, the steel box-type load-bearing member 2 includes an annular steel rib plate 21, a longitudinal steel rib plate 22, a longitudinal half-rib steel plate 23, an outer edge steel plate 24, an inner edge steel plate 25, and a bolt 26. By arranging openings in the annular steel rib plate 21 and the longitudinal steel rib plate 22 and providing the longitudinal half-rib steel plate 23, high-performance concrete 3 can be poured inside the structure to achieve the overall force bearing capacity of the segment structure.

[0066] More specifically, the diameter of the steel plate opening is not less than 100mm and not more than 140mm to ensure structural safety and maximize the density of the internal concrete pouring. Curved bolt splicing points are set on the inner side of the pipe segment, and the bolt size should not be less than M30.

[0067] The pipe segments of the utility model can significantly improve the bearing capacity of the pipe segments themselves by filling the inside of the steel box-type load-bearing components with high-performance concrete; anti-cracking steel mesh and concrete protective layer are arranged on the outside of the pipe segments, which greatly improves the durability of the pipe segments themselves; the connection between the annular seams and longitudinal seams of the pipe segments is made of concrete, so that the structural system can adapt to the tongue and groove connection forms of various molds, which is convenient for generation using various molds without the need for additional molds; special lap steel plates are used to connect the pipe segments, which improves the integrity of the pipe segments and further improves the safety factor during the construction process of the pipe segments crossing heavy load risk sources.

[0068] The shield segment structure system of the utility model adopts a layered design in structure. The outermost layer is a reinforced concrete protective layer, which can not only effectively prevent the external environment from eroding the internal structure, but also absorb and disperse the external load to a certain extent, playing a preliminary protective role.

[0069] The middle layer of the utility model is a steel box-type load-bearing member, which is the core part of the entire structural system. The steel box-type load-bearing member is made of high-strength steel and has excellent load-bearing capacity and anti-deformation ability. Its design adopts a combination of circumferential and longitudinal steel ribs to form a solid box structure. This design enables the shield segment to effectively disperse the pressure when it is under heavy load, reducing the risk of excessive stress at a single point.

[0070] The interior of the utility model is filled with a concrete layer, and the high-performance concrete used has excellent compressive strength and durability. It is closely combined with the steel box-type load-bearing components to form an integrally stressed composite structure, further enhancing the overall stability of the shield segment.

[0071] In terms of materials, the utility model uses high-strength steel and high-performance concrete. High-strength steel has excellent tensile, compressive and shear resistance, and is an ideal material for manufacturing steel box-type load-bearing components. High-performance concrete has the characteristics of high strength, high durability and low permeability, and is very suitable as the outer material of the steel shell.

[0072] The utility model adopts specially made bent bolts and other high-strength connecting parts to ensure the close connection between the layers of the structure. This connection method not only ensures the integrity of the structure, but also can absorb and buffer the impact of external loads on the structure to a certain extent.

[0073] The utility model fully considers the safety and durability requirements of shield segments under heavy load conditions. By optimizing the structural design, selecting high-strength materials and adopting advanced connection methods, it ensures that the shield segments can maintain stable bearing capacity and anti-deformation ability during long-term use. In addition, the setting of the reinforced concrete protective layer further enhances the durability of the shield segments, enabling them to resist erosion in various harsh environmental conditions.

Claims

1. A steel-concrete composite structure system for underground engineering under heavy load conditions, characterized by: The invention comprises a steel box-type load-bearing member (2), wherein a pipe segment outer protective layer (1) is arranged outside the steel box-type load-bearing member (2), wherein the pipe segment outer protective layer (1) and the steel box-type load-bearing member (2) are connected as a whole, wherein a plurality of cavities are formed inside the steel box-type load-bearing member (2), wherein the cavities are filled with internal filling concrete (3), wherein the internal filling concrete (3) and the concrete protective layer (11) in the pipe segment outer protective layer (1) act together internally and externally to enhance the stability and bearing capacity of the overall structure.

2. The steel-concrete composite structure system for underground engineering under heavy load conditions according to claim 1, characterized in that: The outer protective layer (1) of the pipe segment comprises a concrete protective layer (11) and an inner anti-cracking steel mesh (12); the inner anti-cracking steel mesh (12) is connected to a steel box-type load-bearing member (2).

3. The steel-concrete composite structure system for underground engineering under heavy load conditions according to claim 1 is characterized by: The steel box-type load-bearing member (2) is divided into a plurality of chambers, and the chambers can be filled with concrete (3).

4. The steel-concrete composite structure system for underground engineering under heavy load conditions according to claim 1 is characterized by: The segment outer protective layer (1) and the steel box-shaped load-bearing member (2) are assembled into a ring, and the steel box-shaped load-bearing member (2) is connected in the circumferential direction via annular seams.

5. The steel-concrete composite structure system for underground engineering under heavy load conditions according to claim 4 is characterized by: The annular seams are connected by filling concrete, and the annular seams can be filled with tongues and grooves adapted to various molds.

6. The steel-concrete composite structure system for underground engineering under heavy load conditions according to claim 4 is characterized by: The segment outer protective layer (1) and the steel box-type load-bearing member (2) are connected in the longitudinal direction via a longitudinal seam.

7. The steel-concrete composite structure system for underground engineering under heavy load conditions according to claim 6 is characterized by: The longitudinal joints are connected by filling concrete, and the longitudinal joints can be filled with tongues and grooves adapted to various molds.

8. The steel-concrete composite structure system for underground engineering under heavy load conditions according to claim 7, characterized in that: A hand hole (42) is reserved in the steel box-type load-bearing component (2), and the hand holes (42) in adjacent steel box-type load-bearing components (2) correspond to each other.

9. The steel-concrete composite structure system for underground engineering under heavy load conditions according to claim 8, characterized in that: A bent bolt (41) is provided in a pair of adjacent hand holes (42), and the steel connection of adjacent steel box-type load-bearing components (2) is achieved through the bent bolt (41).

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