Modularized subway underground excavation construction steel arch structure

Abstract

The utility model relates to the technical field of tunnel construction, and discloses a modularized subway underground excavation construction steel arch structure which comprises a plurality of arch units which are detachably connected, every two adjacent arch units are connected through a connecting structure, and a prestress tensioning adjusting assembly is fixedly arranged at the position of each connecting structure. The prestress tensioning adjusting assembly is used for applying prestress to the connecting structure and adjusting the bending radian, the prefabricated arch frame units are quickly assembled through the connecting plates and the bolts to form a primary steel arch frame structure, then prestress is applied to the connecting position through the prestress tensioning adjusting assembly, and the steel arch frame structure is formed. The steel arch frame has the advantages of being simple in structure, capable of improving the compression resistance of the connecting position, ensuring that the steel arch frame has enough stress strength, and finally finely adjusting the bending radian of the arch frame by adjusting the tensioning force according to construction requirements to ensure the integrity and continuity of the structure.

Description

Technical Field

[0001] This utility model relates to the technical field of tunnel construction, and in particular to a modular steel arch frame structure for subway tunnel excavation. Background Technology

[0002] Subway tunneling is a method of construction that involves working in a concealed underground space during the construction of subway tunnels. During tunneling, as excavation progresses, inverted arch blocks need to be laid below the tunnel, and steel arch frames are erected above the inverted arch blocks to form support, ensuring the stability of the excavated tunnel and preventing tunnel collapse.

[0003] During construction, the steel arch frame is assembled from multiple sections of curved I-beams. However, manufacturing errors during the production of these curved I-beams can result in non-standard overlap shapes at the final joints of the steel arch frame, especially at the connection points between two arch frames. For example... Figure 5 Due to processing or welding errors, the curvature of the connection point between the two arch sections after splicing does not meet the design requirements, resulting in poor compressive strength at the connection point and subsequent breakage under pressure, which in turn causes the entire steel arch frame to break.

[0004] In addition, the existing steel arch frame uses multiple sections of I-beams spliced ​​together to form a ring arch frame structure. The ring arch frame structure has higher overall strength, but it is prone to misalignment at the beginning and end during connection due to processing errors. Summary of the Invention

[0005] The purpose of this utility model is to provide a modular steel arch frame structure for subway tunnel construction, so as to solve the problems of installation difficulties and reduced strength caused by the processing quality of existing steel arch frames.

[0006] This utility model is achieved through the following technical solution:

[0007] A modular steel arch frame structure for subway tunnel construction includes multiple detachably connected arch frame units. Adjacent arch frame units are connected by a connecting structure. A prestressing tension adjustment component is fixedly installed at the position of the connecting structure. The prestressing tension adjustment component is used to apply prestress and adjust the bending curvature at the connecting structure.

[0008] This ensures that the two arch frame units will not fracture due to external forces at the connection point, increasing the compressive strength of the connection point. At the same time, the prestressed tension adjustment component can also fine-tune the bending curvature of multiple connection points, ultimately allowing the steel arch frame ends that could not be connected due to processing errors to be connected.

[0009] In one possible design, the connection structure includes connecting plates respectively disposed at adjacent ends of two adjacent arch frame units, each connecting plate having screw holes, and also includes bolts passing through the screw holes to connect the two adjacent connecting plates.

[0010] In one possible design, the prestressed tension adjustment assembly includes a tension rod, a tension buckle, and a threaded sleeve. A connecting column is fixed on the arch frame unit, the tension buckle is sleeved on the connecting column, the tension buckle is rotatably equipped with a threaded sleeve, the two ends of the tension rod are threaded, and the threaded sleeve is threadedly connected to the tension rod.

[0011] In one possible design, the connecting column is located on the side of the arch frame unit near the outer arc, and a limiting notch is provided on the side of the connecting plate near the inner arc of the arch frame unit. The tensioning cable is pulled by the connecting columns on the two arch frame units and the limiting notch. A protective sleeve is also provided on the outside of the connecting column. The protective sleeve is made of flexible wear-resistant material to prevent the connecting column from being damaged by external forces during construction, and at the same time avoid direct friction between the tensioning buckle and the connecting column, thus extending its service life.

[0012] The tensioning rod is pulled by the connecting column and the limiting notch on the two arch frame units, so that the two arch frame units maintain an inward bending tendency. By applying prestress to the connection, the compressive strength at the connection position between the two adjacent arch frame units can be greatly improved, ensuring that the arch structure of the steel arch frame will not break at a single connection position, thereby improving the overall strength.

[0013] In one possible design, the arch frame unit uses three different lengths and curvature specifications of I-beams, with an overall arc shape, a single segment length of 0.5-5m, and a wall thickness of 10-20mm.

[0014] In one possible design, the arch frame unit is made of cold-formed steel, specifically Q345B low-alloy high-strength steel, with a yield strength ≥345MPa.

[0015] In one possible design, the surface of the arch unit is provided with an anti-corrosion layer, which includes a hot-dip galvanized layer and an epoxy resin coating, with a total thickness of ≥120μm.

[0016] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0017] This invention rapidly assembles prefabricated arch frame units using connecting plates and bolts to form a preliminary steel arch frame structure. Then, a prestressing tension adjustment component is used to apply prestress to the connection points to enhance the compressive strength of the connection positions and ensure that the steel arch frame has sufficient load-bearing strength. Finally, according to construction requirements, the bending curvature of the arch frame is finely adjusted by adjusting the tension force to ensure the integrity and continuity of the structure. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the connecting plate in this utility model;

[0021] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 4 This is a schematic diagram of the surface coating structure of the arch frame unit in this utility model;

[0023] Figure 5 This is an example diagram illustrating an abnormal arc when the connection position of the arch frame unit is not properly aligned.

[0024] The reference numerals in the attached drawings represent: 1-arch frame unit, 101-connecting column, 2-connecting structure, 201-connecting plate, 202-screw hole, 203-limiting notch, 3-prestressed tension adjustment assembly, 301-tensioning rod, 302-tensioning buckle, 303-threaded sleeve, 304-rotating connector, 4-bolt, 5-nut, 6-anti-corrosion layer, 61-hot-dip galvanized layer, 62-epoxy resin coating. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0026] Examples, such as Figures 1 to 5As shown, a modular steel arch frame structure for subway tunnel construction includes multiple detachably connected arch frame units 1. Adjacent arch frame units 1 are connected by a connecting structure 2. A prestressing tension adjustment component 3 is fixedly installed at the position of the connecting structure 2. The prestressing tension adjustment component 3 is used to apply prestress and adjust the bending curvature at the connecting structure 2. After the arch frame units 1 are assembled, prestress can be applied at the assembly position through the prestressing tension adjustment component 3, thereby ensuring that the two arch frame units 1 will not break due to external force at the connection position, increasing the compressive strength of the connection position. At the same time, the prestressing tension adjustment component 3 can also fine-tune the bending curvature at multiple connection points, ultimately allowing the ends of the steel arch frames that cannot be connected due to processing errors to be connected.

[0027] In this embodiment, the connecting structure 2 includes connecting plates 201 symmetrically arranged at the ends of the arch frame unit 1 and bolts 4 passing through the connecting plates 201. The surface of the connecting plates 201 is provided with screw holes 202. When assembling the steel arch frame, the connecting plates 201 between adjacent arch frame units 1 are connected, and then the bolts 4 are passed through the screw holes 202. The connection is completed by the cooperation of the bolts 4 and the nuts 5.

[0028] In this embodiment, the prestressed tension adjustment assembly 3 includes a tensioning rod 301, a tensioning buckle 302, and a threaded sleeve 303. A connecting column 101 is fixed on the arch frame unit 1. The tensioning buckle 302 is sleeved on the connecting column 101. The tensioning buckle 302 is rotatably provided with the threaded sleeve 303. Both ends of the tensioning rod 301 are provided with threads. The threaded sleeve 303 is threadedly connected to the tensioning rod 301, so that rotating the threaded sleeve 303 can adjust the tension force on the tensioning rod 301. A rotating connector 304 is fixed on the tensioning buckle 302, and the rotating connector 304 is rotatably connected to the tensioning buckle 302.

[0029] Furthermore, the connecting column 101 is located on the side of the arch frame unit 1 near the outer arc, and the connecting plate 201 has a limiting notch 203 on the side near the inner arc of the arch frame unit 1. The limiting notch 203 is close to the inner arc side of the arch frame unit, which can ensure that the tensioning cable 301 always maintains the correct direction during the pulling process, and avoid the arch frame unit from concave fracture due to external force. The tensioning cable 301 is pulled by the connecting column 101 on the two arch frame units 1 and the limiting notch 203, so that the two arch frame units 1 maintain an inward bending tendency. By applying prestress to the connection, the compressive strength at the connection position between two adjacent arch frame units 1 can be greatly improved, ensuring that the arch structure of the steel arch frame will not break at a single connection position.

[0030] Advantageously, a protective sleeve is also provided on the outer side of the connecting column 101. The protective sleeve is made of flexible wear-resistant material to prevent the connecting column from being damaged by external forces during construction, and at the same time to avoid direct friction between the tension buckle 302 and the connecting column 101, thus extending the service life.

[0031] Furthermore, the screw holes 202 on the connecting plate 201 are more numerous and denser on the outer arc side of the arch frame unit 1, and fewer on the side closer to the inner arc of the arch frame unit 1, thereby ensuring sufficient tensile strength at the tensioning point on the connecting plate 201.

[0032] Advantageously, the arch frame unit 1 adopts three different lengths and arc specifications of I-beam units, with an overall arc shape, a single section length of 0.5-5m, and a wall thickness of 10-20mm.

[0033] Advantageously, the arch frame unit 1 is made of cold-formed steel, and the material is Q345B low alloy high strength steel with a yield strength ≥345MPa.

[0034] Furthermore, the surface of the arch frame unit 1 is provided with an anti-corrosion layer 6, which includes a hot-dip galvanized layer 61 and an epoxy resin coating 62, with a total thickness ≥120μm.

[0035] Working principle:

[0036] Before installation, each section 1 is spliced ​​sequentially. During splicing, adjacent arch frame units 1 are connected by bolts 4 and nuts 5. There is no need to pre-tighten the bolts 4 and nuts 5 during connection. First, the arch frame units 1 are spliced ​​into a whole frame. Then, the overall dimensions of the frame are checked. If the connection curvature between two arch frame units 1 is found to be inconsistent with the design standard, the curvature at that point can be adjusted by the prestressing tension adjustment component 3. If the curvature at that point is too small, the prestressing tension adjustment component 3 at that point is directly adjusted. By rotating the threaded sleeve 303, the threaded sleeve 303 is threadedly connected to the end of the tensioning rod 301. Thus, the connecting columns 101 on both sides of the connecting structure 2 are pulled by the tensioning rod 301, which can increase the curvature at that point to a certain extent. Even if the change in curvature is not obvious, under the action of the prestressing tension adjustment component, the connection position is subjected to greater prestress, which can significantly improve the compressive strength of the connection position and ensure the overall connection strength.

[0037] If the arc between the two arch frame units 1 is too large, the arc at the connection points around that point is likely to be too small, making it difficult to guarantee the compressive strength of the remaining connection points. It is necessary to adjust the prestress tension adjustment components 3 at both ends of the connection point to apply prestress and increase its compressive strength to ensure that the remaining connection points have sufficient compressive strength.

[0038] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A modular subway underground construction steel arch structure, characterized in that: The arch unit (1) is detachably connected, adjacent arch units (1) are connected by a connecting structure (2), and a prestressed tension adjusting assembly (3) is matched, and the prestressed tension adjusting assembly (3) is used for prestressed force application and bending curvature adjustment at the connecting structure (2).

2. The modular subway underground construction steel arch structure according to claim 1, characterized in that: The connecting structure (2) includes connecting plates (201) arranged at adjacent ends of adjacent two arch units (1), screw holes (202) are arranged on each connecting plate (201), and the connecting structure (2) further includes bolts (4) penetrating through the screw holes (202) and connecting the adjacent two connecting plates (201).

3. The modular subway underground construction steel arch structure according to claim 2, characterized in that: The prestressed tension adjusting assembly (3) includes a tension cable (301), a tension buckle (302) and a threaded sleeve (303), the arch unit (1) is fixed with a connecting column (101), the tension buckle (302) is sleeved on the connecting column (101), the tension buckle (302) is rotatably provided with the threaded sleeve (303), the tension cable (301) is provided with threads at both ends, and the threaded sleeve (303) is threadedly connected with the tension cable (301).

4. The modular subway underground construction steel arch structure according to claim 3, characterized in that: The connecting column (101) is located on the side of the arch unit (1) close to the outer arc, the connecting plate (201) is provided with a limiting notch (203) on the side close to the inner curvature of the arch unit (1), and the tension cable (301) is pulled through the connecting columns (101) and the limiting notches (203) on the two arch units (1).

5. The modular subway underground construction steel arch structure according to claim 1, characterized in that: The arch unit (1) adopts three different lengths and arc specifications of I-shaped units, the overall shape adopts an arc shape, the single length is 0.5-5m, and the wall thickness is 10-20mm.

6. The modular subway underground construction steel arch structure according to claim 1, characterized in that: The arch unit (1) is made of cold-bending steel, the material is Q345B low-alloy high-strength steel, and the yield strength is greater than or equal to 345MPa.

7. The modular subway underground construction steel arch structure according to claim 1, characterized in that: The surface of the arch unit (1) is provided with an anti-corrosion layer (6), the anti-corrosion layer (6) includes a hot-dip galvanizing layer (61) and an epoxy resin coating (62), and the total thickness is greater than or equal to 120μm.

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