Rectangular pipe-jacking tunnel structure for metro section

Abstract

The utility model discloses a rectangular pipe-jacking tunnel structure for a subway section, which comprises pipe joints arranged along a tunnel, bent bolts are fixedly arranged in bolt holes reserved between the pipe joints, each pipe joint is provided with a first grouting hole, a second grouting hole and a pre-embedded steel pipe in the circumferential direction, secondary grouting holes are formed in the top and the side part of each pipe joint, and each secondary grouting hole is provided with a first grouting hole, a second grouting hole and a pre-embedded steel pipe. Buried plates which are symmetrically arranged are arranged on the inner walls of the pipe joints in the circumferential direction, connecting plates are fixedly connected between the buried plates arranged on the same sides of the adjacent pipe joints, the connecting seams between the adjacent pipe joints are filled with sectioned force transmission gaskets, sealing rubber gaskets are arranged in grooves between the force transmission gaskets, and the adjacent pipe joints are connected through connector steel lantern rings in a bell and spigot joint mode. A bellmouth used for being connected with the connector steel lantern ring is formed in the pipe joint located on the rear side, and a water stop strip is pressed between the force transmission gasket and the connector steel lantern ring. The utility model aims to provide a rectangular pipe-jacking tunnel suitable for metro interval limits, and the pipe-jacking tunnel structure improves the joint rigidity and waterproof strength at the joints of the pipe joints.

Description

Technical Field

[0001] The utility model relates to the technical field of subway construction, in particular to a rectangular jacking tunnel structure used in a subway section. Background Art

[0002] The rectangular pipe jacking method is a trenchless construction technology for constructing large underground spaces. Compared with underground space construction methods such as open excavation and shield tunneling, it has significant advantages such as low comprehensive cost, less traffic interference, and environmental friendliness. As a method of subway construction, the rectangular pipe jacking method is currently commonly used in subway entrance and exit crossing passages, but there are few related cases in subway section tunnel construction. Therefore, there is an urgent need for a rectangular pipe jacking tunnel that is suitable for subway section limits and has improved joint stiffness and waterproof strength at pipe joint joints. Utility Model Content

[0003] The utility model aims to overcome the deficiencies in the above-mentioned prior art and aims to provide a rectangular jacking tunnel suitable for subway section boundaries and a jacking tunnel structure which improves the joint stiffness and waterproof strength of the pipe joints.

[0004] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0005] A rectangular jacking tunnel structure for a subway section comprises pipe sections arranged along the tunnel direction, bent bolts are fixedly arranged in bolt holes reserved between the pipe sections, a first grouting hole, a second grouting hole and a pre-buried steel pipe are circumferentially arranged on each pipe section, secondary grouting holes are arranged on the top and side of the pipe section, symmetrically arranged buried plates are circumferentially arranged on the inner wall of the pipe section, connecting plates are fixedly connected between the buried plates arranged on the same side of adjacent pipe sections, connecting seams between adjacent pipe sections are filled with segmented force transmission pads, sealing rubber pads are arranged in grooves between the force transmission pads, adjacent pipe sections are connected by socket-and-socket connection through interface steel sleeve rings, a socket for connection to the interface steel sleeve ring is formed on the rear pipe section, and a water stop strip is pressed between the force transmission pad and the interface steel sleeve ring.

[0006] Furthermore, a water-stop steel ring is pre-buried in the outer peripheral surface of the socket, and sealant is embedded between the convex ribs of the water-stop steel ring.

[0007] Furthermore, the gap between the outer peripheral surface of the socket and the interface steel ring and the caulking groove between the force transmission pad and the end of the connecting seam are filled with caulking glue, and the gap between the socket and the interface steel ring is filled with at least two wedge-shaped sealing rings and embedded steel rings.

[0008] Furthermore, the inner walls of the top and sides of the pipe section are fixed with embedded grooves through embedded anchor rods.

[0009] Furthermore, the first grouting holes and the second grouting holes are both provided with 16 holes, the first grouting holes are DN25 pipe section grouting holes, and the second grouting holes are DN50 pipe section grouting holes.

[0010] Furthermore, there are 3 secondary grouting holes in total.

[0011] Furthermore, a total of 16 embedded plates are provided.

[0012] Furthermore, the structural inner diameter of the pipe segment is 4700mm×5500mm, the structural wall thickness of the pipe segment is 600mm, and the structural outer diameter of the pipe segment is 5900mm×6700mm.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model is suitable for rectangular jacking pipe structures with large cross-sections and small span-to-height ratios. Bent bolts are used to connect the pipe joints, and a force transmission gasket and a sealing rubber gasket constitute the first water-stopping measure, a water-stop strip constitutes the second water-stopping measure, and two wedge-shaped sealing rings constitute the third water-stopping measure. Three anti-leakage and water-stopping measures are used to enhance the waterproofing ability of the pipe joints, and caulking glue is used to fill the gaps between the force transmission gasket and the joints and the interface steel sleeve rings, thereby improving the joint stiffness and waterproofing strength of the pipe joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 for Figure 1 Sectional view in the AA direction;

[0017] Figure 3 for Figure 1 Cross-sectional view in the BB direction;

[0018] Figure 4 It is a schematic diagram of the buried plate connection structure of adjacent pipe sections in the utility model;

[0019] Figure 5 It is a schematic diagram of the sealing structure at the connecting seam of the middle pipe section of the utility model;

[0020] Figure 6 It is a structural schematic diagram of the embedded channel in the utility model.

[0021] Reference numerals:

[0022] 1- pipe joint, 2- embedded plate, 3- bent bolt, 4- secondary grouting hole, 5- embedded steel pipe, 6- first grouting hole, 7- second grouting hole, 8- connection seam, 9- connection plate, 10- force transmission pad, 11- sealing rubber pad, 12- interface steel sleeve ring, 13- water stop strip, 14- water stop steel ring, 15- sealant, 16- caulking glue, 17- wedge sealing ring, 18- embedded steel ring, 19- embedded anchor rod, 20- embedded groove, 21- socket. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0024] like Figures 1 to 6 As shown, a rectangular jacking tunnel structure for a subway section comprises pipe segments 1 arranged along the tunnel direction, bent bolts 3 are fixedly arranged in bolt holes reserved between the pipe segments 1, first grouting holes 6, second grouting holes 7 and embedded steel pipes 5 are circumferentially arranged on each pipe segment 1, secondary grouting holes 4 are arranged on the top and sides of the pipe segment 1, symmetrically arranged embedded plates 2 are circumferentially arranged on the inner wall of the pipe segment 1, connecting plates 9 are fixedly connected between the embedded plates 2 arranged on the same side of adjacent pipe segments 1, segmented force transmission pads 10 are filled at the connecting seams 8 between adjacent pipe segments 1, sealing rubber pads 11 are arranged in the grooves between the force transmission pads 10, adjacent pipe segments 1 are socket-connected by interface steel sleeves 12, the pipe segment 1 located at the rear side is formed with a socket 21 for connecting to the interface steel sleeve 12, and a water stop strip 13 is pressed between the force transmission pad 10 and the interface steel sleeve 12.

[0025] According to the limit requirements of Type A vehicles in the "Metro Design Code" and taking into account construction errors and later uneven settlement values, the distance between the center line of the line and the inner skin of the top pipe is 2350mm, the distance between the rail surface and the inner skin of the bottom plate of the top pipe is 870mm, and the distance between the rail surface and the inner skin of the top plate of the top pipe is 4630mm. Therefore, according to the above dimensions, the structural inner diameter of the pipe segment 1 is 4700mm×5500mm, the structural wall thickness of the pipe segment 1 is 600mm, and the structural outer diameter of the pipe segment 1 is 5900mm×6700mm. Among them, 16 first grouting holes 6 and second grouting holes 7 are provided, the first grouting holes 6 are DN25 pipe segment grouting holes, which are used for friction reduction grouting, and the second grouting holes 7 are DN50 pipe segment grouting holes, which are used for displacement grouting. At the same time, considering that the span height of the top pipe segment 1 is relatively small, it is easy to tilt during the top pipe segment jacking process, so a total of 3 DN100 secondary grouting holes 4 are reserved on the top and both sides of the pipe segment 1 for deviation correction. There are 16 embedded plates 2, and the embedded plates 2 are fixed with connecting plates 9 as a stopper. Considering the comprehensive arrangement of the evacuation platform and pipelines in the later stage, embedded grooves 20 are fixed on the inner wall of the top and side of the pipe section 1 by embedded anchor rods 19.

[0026] The specific jacking construction steps are as follows: the prefabricated jacking pipe segment 1 is transported to the construction site, and the jacking direction of the jacking pipe segment 1 is forward. The rear end of the pipe segment 1 is formed with a socket 21 for connecting with the interface steel sleeve 12, and the interface steel sleeve 12 is closely attached to the outer peripheral surface of the socket 21. A water-stop steel ring 14 is arranged between the front end of the interface steel sleeve 12 and the outer peripheral surface of the socket 21. The water-stop steel ring 14 is pre-embedded in the outer peripheral surface of the socket 21, and a sealant 15 is embedded between the two convex ribs of the water-stop steel ring 14. The sealant 15 is a single-component water-expandable sealant SM. The caulking groove formed between the rear end of the outer peripheral surface of the socket 21 and the interface steel sleeve 12 is filled with a modified silicone caulking glue 16. Adjacent pipe segments 1 are connected by a socket-and-spigot connection through an interface steel sleeve 12. The connection seam 8 of adjacent pipe segments 1 uses a nitrile cork rubber with a high elastic modulus as a force transmission pad 10, and the joints of the pipe segments 1 are connected in the form of an interface steel sleeve 12. A groove is left in the middle of the force transmission pad 10, and an EPDM elastic sealing rubber pad 11 is embedded in the groove to block the water seepage channel in the middle of the pipe segment 1. The caulking groove at the bottom of the pipe segment 1, i.e., the inner side of the pipe segment 1, is caulked with a modified silicone caulking adhesive 16. The gap between the socket 21 and the interface steel sleeve 12 is filled with at least two wedge-shaped sealing rings 17, and the two wedge-shaped sealing rings 17 are fixed by a protruding embedded steel ring 18 greater than or equal to 20 mm, and a water-expandable water stop strip 13 is embedded between the socket 21 and the force transmission pad 10. After the jacking construction is completed, the M30 bent bolts 3 are inserted through the bolt holes reserved between the pipe segments 1 and tightened.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rectangular pipe-jacking tunnel structure for a subway section, comprising pipe segments (1) arranged along the tunnel direction, characterized in that: A bent bolt (3) is fixedly arranged in the bolt holes reserved between the pipe sections (1); each pipe section (1) is circumferentially arranged with a first grouting hole (6), a second grouting hole (7) and a pre-buried steel pipe (5); the top and side of the pipe section (1) are both provided with secondary grouting holes (4); the inner wall of the pipe section (1) is circumferentially arranged with symmetrically arranged buried plates (2); a connecting plate (9) is fixedly connected between the buried plates (2) arranged on the same side of adjacent pipe sections (1); adjacent pipe sections (1) are connected to each other by a plurality of symmetrically arranged buried plates (2); The connecting seams (8) between the sections (1) are filled with segmented force transmission pads (10), and sealing rubber pads (11) are arranged in the grooves between the force transmission pads (10). The adjacent pipe sections (1) are connected by means of an interface steel sleeve (12). The pipe section (1) located at the rear side is formed with a socket (21) for connecting with the interface steel sleeve (12), and a water stop strip (13) is pressed between the force transmission pad (10) and the interface steel sleeve (12).

2. A rectangular pipe-jacking tunnel structure for a subway section according to claim 1, characterized in that: A water-stop steel ring (14) is pre-buried on the outer peripheral surface of the socket (21), and a sealant (15) is embedded between the convex ribs of the water-stop steel ring (14).

3. The rectangular pipe-jacking tunnel structure for a subway section according to claim 1, characterized in that: The gap between the outer peripheral surface of the socket (21) and the interface steel sleeve ring (12) and the caulking groove between the force transmission pad (10) and the end of the connecting seam (8) are filled with caulking glue (16), and the gap between the socket (21) and the interface steel sleeve ring (12) is filled with at least two wedge-shaped sealing rings (17) and a pre-buried steel ring (18).

4. The rectangular pipe-jacking tunnel structure for a subway section according to claim 1, characterized in that: The inner walls of the top and side of the pipe section (1) are fixed with embedded grooves (20) via embedded anchor rods (19).

5. The rectangular pipe-jacking tunnel structure for a subway section according to claim 1, characterized in that: There are 16 first grouting holes (6) and 16 second grouting holes (7), the first grouting holes (6) are DN25 pipe joint grouting holes, and the second grouting holes (7) are DN50 pipe joint grouting holes.

6. The rectangular pipe-jacking tunnel structure for a subway section according to claim 1, characterized in that: A total of three secondary grouting holes (4) are provided.

7. The rectangular pipe-jacking tunnel structure for a subway section according to claim 1, characterized in that: A total of 16 embedded plates (2) are provided.

8. The rectangular pipe-jacking tunnel structure for a subway section according to claim 1, characterized in that: The structural inner diameter of the pipe segment (1) is 4700 mm×5500 mm, the structural wall thickness of the pipe segment (1) is 600 mm, and the structural outer diameter of the pipe segment (1) is 5900 mm×6700 mm.

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