A curved immersed tube tunnel section connection structure

Abstract

The present invention provides a curved immersed tube tunnel pipe segment connection structure, comprising a plurality of pipe segment units, each two adjacent pipe segment units are connected by a pipe joint, the front end of the pipe joint is fixed to the rear end of the first pipe segment unit, and the rear end of the pipe joint is fixed to the front end of the second pipe segment unit, so that the two adjacent pipe segment units are spliced ​​and fixed; each pipe segment unit comprises: a first straight segment, a curved segment and a second straight segment; the first straight segment and the second straight segment are respectively located at the two end positions of the pipe segment unit, and the curved segment is located in the middle position of the pipe segment unit. The present invention can solve the problem of large curvature immersed tube tunnel structure design.

Description

Technical Field

[0001] The present application relates to the technical field of tunnels and underground engineering, and in particular to a curved immersed tube tunnel pipe segment connection structure. Background Art

[0002] The immersed tube tunnel method has made great progress in recent years. Its construction sequence is as follows: first, the tunnel section is made on the slipway or in the dry dock. After the two ends of the section are sealed with temporary sealing walls, it is slid into the water or released into the dock to make it float in the water. The section is then towed to the designed position of the tunnel section by section. After positioning, water is injected into the section to make it sink into the pre-dug underwater foundation trench, and the adjacent sections are connected by hydraulic compression. Finally, the sealing walls are removed to connect the sections to form an integral tunnel. The top and outside are backfilled and covered to ensure safety.

[0003] So far, there are more than 100 examples of immersed tube tunnels built, with as many as 20 built between 1990 and 1995 alone. The development of immersed tube tunnels has attracted worldwide attention. The longest immersed tube tunnel is the San Francisco Bay Area Rapid Transit Tunnel in California, USA, which was completed in 1970. The total buried length is 5,825m and the depth to the bottom of the structure is 40.5m. The development of immersed tube tunnels in my country has been going on for about 30 years since the Guangzhou Pearl River Tunnel, and has achieved remarkable results. China has the design and construction capabilities for large-section, long-distance immersed tube tunnels.

[0004] However, in the existing technology, most immersed tube tunnels at home and abroad use straight lines or small curvature circular curves in the plane layout, and large curvature circular curve immersed tube tunnels are still blank. Pipe segment structure design is a key technical problem for large curvature immersed tube tunnels. In addition, under the action of formation pressure and water pressure, the curved immersed tube tunnel will produce a large bending moment at the joint. The greater the curvature of the curve, the greater the bending moment. Therefore, the large curvature immersed tube tunnel needs to have the ability to resist bending moment at the joint.

[0005] In summary, in order to solve the above problems, how to propose a curved immersed tube tunnel section connection structure, so as to solve the structural design problem of a large curvature immersed tube tunnel, is an issue that urgently needs to be solved in this field. Summary of the invention

[0006] In view of this, the present invention provides a curved immersed tube tunnel section connection structure, thereby solving the structural design problem of a large curvature immersed tube tunnel.

[0007] The technical solution of the present invention is specifically achieved as follows:

[0008] A curved immersed tunnel pipe segment connection structure includes a plurality of pipe segment units, each two adjacent pipe segment units are connected by a pipe segment joint, the front end of the pipe segment joint is fixed to the rear end of the first pipe segment unit, and the rear end of the pipe segment joint is fixed to the front end of the second pipe segment unit, so that the two adjacent pipe segment units are spliced ​​and fixed;

[0009] Each pipe segment unit comprises: a first straight segment, a curved segment and a second straight segment; the first straight segment and the second straight segment are respectively located at two end positions of the pipe segment unit, and the curved segment is located in the middle position of the pipe segment unit.

[0010] Preferably, the pipe joint includes: an inner connecting plate, an outer connecting plate and a plurality of connecting bolts; the inner connecting plate is arranged on the inner side of the pipe wall at the connection of two adjacent pipe section units, and the outer connecting plate is arranged on the outer side of the pipe wall at the connection of two adjacent pipe section units and corresponds to the position of the inner connecting plate; a plurality of connecting bolts fix the inner connecting plate, the pipe walls of two adjacent pipe section units and the outer connecting plate to fix the two adjacent pipe section units together.

[0011] Preferably, the front end of the inner connecting plate is arranged on the inner side of the tube wall at the rear part of the second straight segment of the first tube segment unit, and the rear end of the inner connecting plate is arranged on the inner side of the tube wall at the front part of the first straight segment of the second tube segment unit; the front end of the outer connecting plate is arranged on the outer side of the tube wall at the rear part of the second straight segment of the first tube segment unit, and the rear end of the outer connecting plate is arranged on the outer side of the tube wall at the front part of the first straight segment of the second tube segment unit; a plurality of connecting bolts are sequentially passed through the front end of the outer connecting plate, the tube wall at the rear part of the second straight segment of the first tube segment unit and the front end of the inner connecting plate and fixed; a plurality of connecting bolts are sequentially passed through the rear end of the outer connecting plate, the tube wall at the front part of the first straight segment of the second tube segment unit and the rear end of the inner connecting plate and fixed.

[0012] Preferably, a rubber waterstop is provided between the inner surface of the outer connecting plate and the outer surface of the pipe wall of the pipe section unit.

[0013] Preferably, edge protection blocks are respectively provided at the top ends of both side walls of the pipe section unit.

[0014] Preferably, steel end sealing doors are respectively provided at both ends of the pipe section unit.

[0015] Preferably, a steel corbel and a bolster are provided on the inner side of the steel end sealing door, wherein the steel corbel is provided at the upper end portion of the inner side of the steel end sealing door, and the bolster is provided at the lower end portion of the inner side of the steel end sealing door, for fixing the steel end sealing door.

[0016] Preferably, end steel shells are respectively provided on the outer sides of the steel end sealing doors at both ends of the pipe section unit.

[0017] Preferably, water stop strips are respectively provided on the outer sides of the end steel shells at both ends of the pipe section unit.

[0018] Preferably, the inner connecting plate, the outer connecting plate and the plurality of connecting bolts are all pre-treated for rust and corrosion resistance.

[0019] As can be seen from the above, in the curved immersed tube tunnel segment connection structure of the present invention, by converting the splicing of the curved immersed tube into a straight segment splicing and providing a pipe segment joint, the structural design problem of the large curvature immersed tube tunnel can be solved. Furthermore, the stress state at the joint is improved, and the reliability of the connection is improved; it is conducive to factory prefabrication and improves the quality of prefabricated components; it is conducive to underwater assembly and improves the operability of assembly construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of splicing two adjacent pipe section units in an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of a pipe segment unit in an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of a pipe joint in an embodiment of the present invention.

[0023] Figure 4 for Figure 2 AA section view in.

[0024] Figure 5 for Figure 2 BB cross-section diagram in.

[0025] Figure 6 for Figure 4 CC cross-section diagram in . DETAILED DESCRIPTION

[0026] In order to make the technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 6 As shown, the present invention provides a curved immersed tube tunnel pipe segment connection structure, comprising a plurality of pipe segment units 1, each two adjacent pipe segment units 1 are connected by a pipe joint 2, the front end of the pipe joint 2 is fixed to the rear end of the first pipe segment unit 1, and the rear end of the pipe joint 2 is fixed to the front end of the second pipe segment unit 1, so that the two adjacent pipe segment units 1 are spliced ​​and fixed;

[0028] Each pipe segment unit 1 comprises: a first straight segment 11 , a curved segment 13 and a second straight segment 12 ; the first straight segment 11 and the second straight segment 12 are respectively located at two end positions of the pipe segment unit 1 , and the curved segment 13 is located in the middle position of the pipe segment unit 1 .

[0029] By setting the two ends of the curved pipe segment as straight segments, the connection problem between the curved pipe segments with curvature is converted into the connection between straight segments, thereby realizing the design of the immersed tube tunnel structure with large curvature. Furthermore, it can also effectively improve the operability of the assembly construction and the efficiency of installation. In addition, due to the setting of the straight segment, the curvature of the pipe segment connection is reduced, thereby reducing the bending moment at the connection, improving the stress state of the connection, and improving the reliability of the connection.

[0030] In the technical solution of the present invention, a variety of implementation methods can be used to implement the above-mentioned curved immersed tube tunnel pipe section connection structure. The technical solution of the present invention will be described in detail below by taking one of the implementation methods as an example.

[0031] For example, preferably, in a specific embodiment of the present invention, Figure 3 As shown, the pipe joint 2 may include: an inner connecting plate 21, an outer connecting plate 22 and a plurality of connecting bolts 23; the inner connecting plate is arranged on the inner side of the pipe wall at the connection of two adjacent pipe segment units 1, and the outer connecting plate 22 is arranged on the outer side of the pipe wall at the connection of two adjacent pipe segment units 1, and corresponds to the position of the inner connecting plate; the plurality of connecting bolts 23 fix the inner connecting plate, the pipe walls of the two adjacent pipe segment units 1 and the outer connecting plate, so that the two adjacent pipe segment units 1 are spliced ​​and fixed.

[0032] Preferably, the front end of the inner connecting plate 21 is arranged on the inner side of the tube wall at the rear of the second straight segment 12 of the first pipe segment unit 1, and the rear end of the inner connecting plate 21 is arranged on the inner side of the tube wall at the front of the first straight segment 11 of the second pipe segment unit 1; the front end of the outer connecting plate 22 is arranged on the outer side of the tube wall at the rear of the second straight segment 12 of the first pipe segment unit 1, and the rear end of the outer connecting plate 22 is arranged on the outer side of the tube wall at the front of the first straight segment 11 of the second pipe segment unit 1; a plurality of (for example, 2) connecting bolts 23 are sequentially passed through the front end of the outer connecting plate, the tube wall at the rear of the second straight segment 12 of the first pipe segment unit 1 and the front end of the inner connecting plate and fixed; a plurality of (for example, 2) connecting bolts 23 are sequentially passed through the rear end of the outer connecting plate, the tube wall at the front of the first straight segment 11 of the second pipe segment unit 1 and the rear end of the inner connecting plate and fixed.

[0033] Preferably, a rubber water stop is provided between the inner surface of the outer connecting plate 22 and the outer surface of the pipe wall of the pipe section unit 1 to prevent water leakage between the pipe joint 2 and the pipe section unit 1 .

[0034] Preferably, the inner connecting plate 21, the outer connecting plate 22 and the plurality of connecting bolts 23 may all be pre-treated for rust and corrosion resistance.

[0035] Preferably, the lengths of the first straight segment 11 and the second straight segment 12 may be 1-3 m.

[0036] Preferably, the inner connecting plate 21 and the outer connecting plate 22 may have a length of 3 to 6 m, a height of 1 to 3 m, a thickness of 2 to 10 cm, and may be made of steel of CRB600 or above.

[0037] By providing a pipe joint 2 at the connection of the pipe segment unit, a fixed connection between the straight segments of two adjacent pipe segment units is achieved. Since the curvature of the pipe segment at the joint is reduced, the difficulty of assembly is reduced, thereby effectively improving the bending strength of the pipe segment joint.

[0038] For another example, preferably, in a specific embodiment of the present invention, Figure 4 As shown, edge protection blocks 9 are respectively provided at the top positions of the two side walls of the pipe section unit 1, so as to protect the edge corners of the pipe section from being damaged due to transportation and hoisting.

[0039] In addition, as an example, in a preferred embodiment of the present invention, Figure 5 and Figure 6 As shown, steel end sealing doors 6 are respectively provided at both ends of the pipe section unit 1 for temporarily sealing the pipe opening of the pipe section.

[0040] Preferably, a steel corbel 7 and a pillow block 8 are provided on the inner side of the steel end sealing door 6, wherein the steel corbel 7 is provided at the upper end portion of the inner side of the steel end sealing door 6, and the pillow block 8 is provided at the lower end portion of the inner side of the steel end sealing door 6, for fixing the steel end sealing door 6.

[0041] In addition, as an example, in a preferred embodiment of the present invention, Figure 5 and Figure 6 As shown, the outer sides of the steel end sealing doors 6 at both ends of the pipe section unit 1 are respectively provided with end steel shells, so as to prevent groundwater from seeping into the pipe section during the sinking process.

[0042] Preferably, one end of the pipe section unit 1 may be provided with an A-type end steel shell 4, and the other end may be provided with a B-type end steel shell 5.

[0043] In addition, as an example, in a preferred embodiment of the present invention, Figure 5 and Figure 6 As shown, water stop strips 3 are respectively provided on the outer sides of the end steel shells at both ends of the pipe section unit 1 to prevent water leakage at the joints of two adjacent pipe section units.

[0044] Preferably, the waterstop 3 can use GINA waterstop.

[0045] Preferably, each pipe section unit 1 can be made of C40 concrete, and its impermeability grade is P10.

[0046] To sum up, in the technical solution of the present invention, since straight segments are set at the joints of the curved immersed tubes and the pipe segment units are assembled through pipe segment joints, the structural design problem of the immersed tube tunnel with a large curvature can be solved. Furthermore, the stress state at the joints is improved, and the reliability of the connection is improved. Since the pipe segment units and the pipe segment joints can be prefabricated in the factory, the quality of the prefabricated components is improved. It is conducive to underwater assembly, and the operability of the assembly construction and the efficiency of underwater installation are improved.

[0047] 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 scope of protection of the present invention.

Claims

1. A curved immersed tunnel section connection structure, characterized in that: It comprises a plurality of pipe segment units, each two adjacent pipe segment units are connected by a pipe joint, the front end of the pipe joint is fixed to the rear end of the first pipe segment unit, and the rear end of the pipe joint is fixed to the front end of the second pipe segment unit, so that the two adjacent pipe segment units are spliced ​​and fixed; Each pipe segment unit comprises: a first straight segment, a curved segment and a second straight segment; the first straight segment and the second straight segment are respectively located at two end positions of the pipe segment unit, and the curved segment is located in the middle position of the pipe segment unit; The two ends of the pipe section unit are respectively provided with steel end sealing doors; A steel corbel and a bolster are arranged on the inner side of the steel end sealing door, wherein the steel corbel is arranged at the upper end of the inner side of the steel end sealing door, and the bolster is arranged at the lower end of the inner side of the steel end sealing door, for fixing the steel end sealing door; The outer sides of the steel end sealing doors at the two ends of the pipe section unit are respectively provided with end steel shells; The pipe joint includes: an inner connecting plate, an outer connecting plate and a plurality of connecting bolts; the inner connecting plate is arranged on the inner side of the pipe wall at the connection of two adjacent pipe section units, and the outer connecting plate is arranged on the outer side of the pipe wall at the connection of two adjacent pipe section units and corresponds to the position of the inner connecting plate; a plurality of connecting bolts fix the inner connecting plate, the pipe walls of two adjacent pipe section units and the outer connecting plate to splice and fix the two adjacent pipe section units.

2. The curved immersed tunnel section connection structure according to claim 1, characterized in that: The front end of the inner connecting plate is arranged on the inner side of the tube wall at the rear part of the second straight segment of the first tube segment unit, and the rear end of the inner connecting plate is arranged on the inner side of the tube wall at the front part of the first straight segment of the second tube segment unit; the front end of the outer connecting plate is arranged on the outer side of the tube wall at the rear part of the second straight segment of the first tube segment unit, and the rear end of the outer connecting plate is arranged on the outer side of the tube wall at the front part of the first straight segment of the second tube segment unit; a plurality of connecting bolts pass through the front end of the outer connecting plate, the tube wall at the rear part of the second straight segment of the first tube segment unit and the front end of the inner connecting plate in sequence and are fixed; a plurality of connecting bolts pass through the rear end of the outer connecting plate, the tube wall at the front part of the first straight segment of the second tube segment unit and the rear end of the inner connecting plate in sequence and are fixed.

3. The curved immersed tunnel section connection structure according to claim 1, characterized in that: A rubber water stop is arranged between the inner surface of the outer connecting plate and the outer surface of the pipe wall of the pipe section unit.

4. The curved immersed tunnel section connection structure according to claim 1, characterized in that: Edge protection blocks are respectively arranged at the top ends of both side walls of the pipe section unit.

5. The curved immersed tunnel section connection structure according to claim 1, characterized in that: Waterstop strips are respectively arranged on the outer sides of the end steel shells at both ends of the pipe section unit.

6. The curved immersed tunnel section connection structure according to claim 1, characterized in that: The inner connecting plate, the outer connecting plate and the plurality of connecting bolts are all pre-treated for rust and corrosion resistance.

Images