Pipe jacking structure for high-internal-water-pressure water conveying tunnel
Through the combined structure of reinforced concrete pipes and steel pipes and the ultra-high performance concrete protective layer, the safety problem of the top pipe structure under high internal water pressure is solved, efficient connection and sealing is achieved, and project costs and construction periods are reduced.
Patent Information
- Application Number
- CN202420514026.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-03-15
AI Technical Summary
The existing top pipes are easily subjected to tension damage under high internal water pressure, and there are limitations and safety hazards in welding connections, which increases the cost and construction period.
Adopt a combined structure of reinforced concrete pipe and steel pipe. The steel pipe coaxial sleeve is installed in the reinforced concrete pipe, fixed with the main rib, using an ultra-high performance concrete protective layer, and is connected through the design of convex snaps and sockets, adding waterproof coating layer to improve sealing.
Effectively ensure the safety of the top pipe structure under high internal and external water pressure, shorten the construction period, reduce investment costs, and avoid quality problems and safety hazards caused by welding.
Smart Images
Figure CN222209310U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of water conveyance tunnels, concrete pipes and jacking pipes, and in particular relates to a jacking pipe structure for a water conveyance tunnel with high internal water pressure. Background Art
[0002] In underground projects, pipe jacking is generally used in specific geographical environments, such as underpasses, roads, waterways, railways, etc., where high requirements for ground subsidence control are required. At the same time, with the continuous development of the national economy, water supply pressure is getting higher and higher.
[0003] The existing jacking pipes, when using reinforced concrete pipes, can well withstand external loads and external water pressures, but when the internal water pressure is high, the reinforced concrete pipes are easily damaged by tension; when using steel jacking pipes, they can well withstand high internal water pressures, but when the external loads and external water pressures are large, the steel jacking pipes are easily damaged. Moreover, most of the steel jacking pipes are connected by welding, and the weld connection has many limitations and disadvantages, which may have a certain impact on the construction period. Secondly, welding has high technical requirements for workers, consumes a lot of manpower and material resources, and the welding cost is also high, which will increase the investment cost. The welding method takes a long time, and long-term shutdown will cause the mud to be thixotropic, which will affect the jacking force. At the same time, the welding quality is often not guaranteed during manual welding, and there will be depressions, cracks, pores and slag inclusions, which will cause safety hazards to the project. Utility Model Content
[0004] In view of the deficiencies in the prior art, the utility model provides a pipe jacking structure for a water conveyance tunnel with high internal water pressure, which can fundamentally solve the safety problem of the operation of the pipe jacking structure for a water conveyance tunnel with high internal water pressure.
[0005] To achieve the above object, the utility model adopts the following technical scheme: a pipe jacking structure for a water conveyance tunnel with high internal water pressure, comprising a plurality of pipe jacking bodies connected end to end in sequence;
[0006] The jacking pipe body includes a reinforced concrete pipe and a steel pipe. The steel pipe is coaxially sleeved in the reinforced concrete pipe. The outer wall of the steel pipe is in contact with the inner wall of the reinforced concrete pipe. Anchor bars and main bars are pre-embedded in the reinforced concrete pipe. The steel pipe is fixed to the main bars through the anchor bars.
[0007] Preferably, an anti-corrosion layer is provided on the inner wall of the steel pipe.
[0008] Preferably, a steel pipe protective layer is provided on the inner wall of the anti-corrosion layer.
[0009] Preferably, the steel pipe protective layer is an ultra-high performance concrete protective layer.
[0010] Preferably, a plurality of convex buckles are fixed on an end surface of one end of the jacking tube body, and a concave buckle matched with the convex buckle is provided on the other end surface of the jacking tube body, and the convex buckle of the jacking tube body is embedded in the concave buckle of the adjacent jacking tube body.
[0011] Preferably, a plurality of the convex buckles are arranged at intervals along the circumferential direction.
[0012] Preferably, a socket is fixed on one end surface of the jacking pipe body, and a socket matched with the socket is provided on the other end surface of the jacking pipe body, and the socket of the jacking pipe body is embedded in the socket of the adjacent jacking pipe body.
[0013] Preferably, a plurality of grouting pipes for sealed grouting are provided in the socket, and the grouting pipes extend from the inner end surface to the outer end surface of the socket.
[0014] Preferably, the plurality of grouting pipes are distributed at intervals along the circumferential direction.
[0015] Preferably, both end surfaces of the top pipe body are provided with a waterproof coating.
[0016] Compared with the prior art, the beneficial effects of the utility model are:
[0017] 1. The utility model provides a pipe jacking structure for a high internal water pressure water supply tunnel. The reinforced concrete pipe is coaxially sleeved outside the steel pipe as a lining, and the steel pipe is reliably connected to the main reinforcement of the reinforced concrete pipe, which can effectively ensure the structural safety of the high internal and external water pressure in the pipe jacking water supply tunnel. The excessive internal and external water pressure that the lining may bear is strictly controlled within the allowable range, avoiding the risk of buckling and deformation of the lining due to high external water pressure during maintenance (without internal water pressure), and also eliminating the hidden danger of internal water leakage caused by tensile cracking of the pipe jacking structure during operation (under the action of high internal water pressure), which can fundamentally solve the safety problem of the operation of the pipe jacking structure of the high internal water pressure water supply tunnel. Moreover, the reinforced concrete pipe and the steel pipe can be prefabricated and transported to the pipe jacking construction site for direct assembly after completion, which can better ensure the quality of the pipe jacking structure, effectively ensure the structural safety of the high internal and external water pressure of the water supply project, complete the connection work of the pipe jacking more quickly, shorten the construction period, and solve the limitations and disadvantages brought by conventional bolt connection or welding.
[0018] 2. The utility model provides a top pipe structure for a high internal water pressure water conveyance tunnel, in which the material of the steel pipe protective layer is ultra-high performance concrete. The corrosion resistance and impermeability of this material are 1 to 2 times higher than those of ordinary concrete, and the compressive strength reaches more than 100 MPa, which is 2 to 3 times that of ordinary concrete. It can meet the need to bear the load under the condition of extremely thin pipe wall, and can appropriately reduce the thickness of the protective layer, save the size of the overall excavation section, save investment, and can also solve the problems of missing edges and corners caused by collision during the production and transportation of ordinary concrete, and the honeycomb, hollowing and local non-density of the outer wall protective layer of the pipe body itself. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A schematic diagram of the end surface structure of a jacking pipe body for a jacking pipe structure of a water conveyance tunnel with high internal water pressure provided by an embodiment of the utility model;
[0020] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle.
[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0022] 1. Reinforced concrete pipe; 2. Waterproof coating; 3. Steel pipe; 4. Anti-corrosion layer; 5. Concave buckle; 6. Steel pipe protective layer; 7. Socket; 8. Grouting pipe; 9. Anchor bar; 10. Convex buckle; 11. Socket. DETAILED DESCRIPTION
[0023] The present invention will be further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.
[0024] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrally formed structure. For ordinary technicians in this field, the specific meanings of such terms in this patent can be understood according to specific circumstances.
[0025] like Figure 1-2 As shown, this embodiment provides a pipe jacking structure for a water conveyance tunnel with high internal water pressure, comprising a plurality of pipe jacking bodies connected end to end in sequence;
[0026] The main body of the jacking pipe includes a reinforced concrete pipe 1 and a steel pipe 3. The steel pipe 3 is coaxially sleeved in the reinforced concrete pipe 1. The outer wall of the steel pipe 3 is in contact with the inner wall of the reinforced concrete pipe 1. Anchor bars 9 and main bars are pre-embedded in the reinforced concrete pipe 1. The thickness of the reinforced concrete pipe 1 and the size of the main bars are determined according to the external water pressure and external soil pressure loads. The wall thickness of the steel pipe 3 is calculated and determined according to the internal water pressure load and the inner diameter size.
[0027] The steel pipe 3 is fixed to the main reinforcement by the anchor reinforcement 9. For example, Figure 2 As shown, multiple layers of anchor bars are arranged at intervals along the axial direction in the reinforced concrete pipe 1, and each layer of anchor bars includes multiple anchor bars 9 arranged at intervals along the circumferential direction. One end of the anchor bar 9 is welded to the main bar, and the other end of the anchor bar 9 is welded to the steel pipe 3, so that the steel pipe 3 is reliably connected to the main bar, thereby making the steel pipe 3 reliably connected to the reinforced concrete pipe 1.
[0028] Based on the above structure, the steel pipe 3 and the reinforced concrete pipe 1 are coaxially sleeved together as a lining, which can avoid the risk of lining buckling, deformation and instability caused by high external water pressure during maintenance (no internal water pressure), and also eliminate the hidden danger of internal water seepage caused by tensile cracking of the top pipe structure during operation (under the action of high internal water pressure), which can fundamentally solve the safety problem of the operation of the top pipe structure of the water supply tunnel with high internal water pressure.
[0029] Moreover, the reinforced concrete pipe 1 and the steel pipe 3 can be prefabricated and transported to the jacking construction site for direct assembly after completion, which can better ensure the quality of the jacking structure, effectively ensure the structural safety of high water pressure inside and outside the water supply project, complete the jacking connection work more quickly, shorten the construction period, and solve the limitations and disadvantages brought by conventional bolt connections or welding.
[0030] In this embodiment, an anti-corrosion layer 4 is provided on the inner wall of the steel pipe 3 to improve the corrosion resistance of the steel pipe 3.
[0031] A steel pipe protective layer 6 is provided on the inner wall of the anti-corrosion layer 4. The steel pipe protective layer 6 is an ultra-high performance concrete protective layer. That is, the material of the steel pipe protective layer 6 is ultra-high performance concrete, which has 1 to 2 times higher corrosion resistance and impermeability than ordinary concrete, and a compressive strength of more than 100 MPa, which is 2 to 3 times that of ordinary concrete. It can meet the need to bear loads under the condition of extremely thin pipe walls, appropriately reduce the thickness of the protective layer, save the size of the overall excavation section, save investment, and solve the problems of missing edges and corners caused by collisions during the production and transportation of ordinary concrete, as well as the honeycomb, hollowing and local non-density of the outer wall protective layer of the pipe body itself.
[0032] In this embodiment, a plurality of convex buckles 10 are fixed on the end surface of one end of the jacking pipe body, and a concave buckle 5 matching the convex buckle 10 is provided on the end surface of the other end of the jacking pipe body. The convex buckle 10 of the jacking pipe body is embedded in the concave buckle 5 of the adjacent jacking pipe body. Figure 2As shown, the male buckle 10 can be fixed on the reinforced concrete pipe 1, and the male buckle 10 and the reinforced concrete pipe 1 are an integrated structure. Correspondingly, the female buckle 5 is also arranged on the reinforced concrete pipe 1. The number of the male buckles 10 is determined according to the inner diameter.
[0033] In some embodiments, the convex buckle 10 and the concave buckle 5 can be provided on one end surface of the top tube body, and correspondingly, the convex buckle 10 and the concave buckle 5 are provided on the other end surface of the top tube body, and the two end surfaces of the top tube body are adapted to each other.
[0034] In this way, when assembling the adjacent jacking tube bodies, the convex buckle 10 can be embedded in the concave buckle 5 of the adjacent jacking tube bodies for perfect connection. The convex buckle 10 cooperates with the concave buckle 5 to play a guiding and positioning role, thereby improving the stability of the adjacent jacking tube bodies.
[0035] Among them, a plurality of the convex buckles 10 are arranged at intervals along the circumference. Figure 1 As shown, four convex buckles 10 are fixed on the end surface of one end of the top pipe body, and the four convex buckles 10 are evenly spaced along the circumferential direction.
[0036] In this embodiment, a socket 7 is fixed on one end surface of the jacking pipe body, and a socket 11 matching the socket 7 is provided on the other end surface of the jacking pipe body. The socket 7 of the jacking pipe body is embedded in the socket 11 of the adjacent jacking pipe body. Figure 2 As shown, the socket 7 is an annular structure, and the inner wall of the socket 7 is flush with the inner wall of the steel pipe protective layer 6. It should be noted that the socket 7 includes part of the reinforced concrete pipe 1, part of the steel pipe 3, part of the anti-corrosion layer 4, and part of the steel pipe protective layer 6 from the outside to the inside, and the socket 7 can also be prefabricated. Correspondingly, the socket 11 is an annular groove, and the inner wall of the annular groove is flush with the inner wall of the steel pipe protective layer 6. During assembly, the socket 7 is embedded in the socket 11 of the adjacent jacking pipe body for perfect connection. The socket 7 cooperates with the socket 11 to play a guiding and positioning role, thereby improving the stability of the adjacent jacking pipe body.
[0037] The socket 7 is provided with a plurality of grouting pipes 8 for sealing grouting, and the grouting pipes 8 extend from the inner end surface to the outer end surface of the socket 7. Through the grouting pipes 8, grouting can be performed on the joints of the adjacent jacking pipe bodies during connection, thereby improving the sealing of the joints of the adjacent jacking pipe bodies.
[0038] The plurality of grouting pipes 8 are distributed at intervals along the circumferential direction, so that the joints of the adjacent jacking pipe bodies can be grouted evenly, and the sealing effect is better.
[0039] In this embodiment, both end surfaces of the jacking pipe body are provided with waterproof coating 2. It is worth noting that the end surfaces of the socket 7 and the socket 11 should also be provided with the waterproof coating 2. The waterproof coating 2 can improve the sealing and waterproof properties of the joints of the adjacent jacking pipe bodies.
[0040] Before spraying the waterproof coating 2, anti-corrosion paint may be sprayed first, thereby improving the corrosion resistance of the adjacent joints of the top pipe bodies.
[0041] The mechanisms, components and parts not specifically described in the present invention are all existing structures in the prior art and can be directly purchased from the market.
[0042] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present utility model. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.
[0043] The above is only a preferred embodiment of the utility model, and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A pipe jacking structure for a water conveyance tunnel with high internal water pressure, characterized in that: It includes a plurality of jacking pipe bodies connected end to end in sequence; The jacking pipe body comprises a reinforced concrete pipe (1) and a steel pipe (3); the steel pipe (3) is coaxially sleeved in the reinforced concrete pipe (1); the outer wall of the steel pipe (3) is in contact with the inner wall of the reinforced concrete pipe (1); anchor bars (9) and main bars are pre-embedded in the reinforced concrete pipe (1); the steel pipe (3) is fixed to the main bars via the anchor bars (9).
2. A pipe jacking structure for a water conveyance tunnel with high internal water pressure according to claim 1, characterized in that: An anti-corrosion layer (4) is provided on the inner wall of the steel pipe (3).
3. A pipe jacking structure for a high internal water pressure water delivery tunnel according to claim 2, characterized in that: A steel pipe protective layer (6) is provided on the inner wall of the anti-corrosion layer (4).
4. A pipe jacking structure for a water conveyance tunnel with high internal water pressure according to claim 3, characterized in that: The steel pipe protective layer (6) is an ultra-high performance concrete protective layer.
5. The pipe jacking structure for a water conveyance tunnel with high internal water pressure according to claim 1, characterized in that: A plurality of convex buckles (10) are fixed on the end surface of one end of the jacking tube body, and a concave buckle (5) matched with the convex buckle (10) is provided on the end surface of the other end of the jacking tube body, and the convex buckle (10) of the jacking tube body is embedded in the concave buckle (5) of the adjacent jacking tube body.
6. A pipe jacking structure for a water conveyance tunnel with high internal water pressure according to claim 5, characterized in that: A plurality of the convex buckles (10) are arranged at intervals along the circumferential direction.
7. The pipe jacking structure for a water conveyance tunnel with high internal water pressure according to claim 1, characterized in that: A socket (7) is fixed on one end surface of the jacking pipe body, and a socket (11) matching the socket (7) is provided on the other end surface of the jacking pipe body. The socket (7) of the jacking pipe body is embedded in the socket (11) of the adjacent jacking pipe body.
8. The pipe jacking structure for a water conveyance tunnel with high internal water pressure according to claim 7, characterized in that: A plurality of grouting pipes (8) for sealing grouting are arranged in the socket (7), and the grouting pipes (8) extend from the inner end surface to the outer end surface of the socket (7).
9. The pipe jacking structure for a water conveyance tunnel with high internal water pressure according to claim 8, characterized in that: The plurality of grouting pipes (8) are distributed at intervals along the circumferential direction.
10. The pipe jacking structure for a water conveyance tunnel with high internal water pressure according to claim 1, characterized in that: Both end surfaces of the top pipe body are provided with waterproof coatings (2).