Large-diameter pressure pipeline pipe jacking well permanent and temporary combined structure

Abstract

The utility model relates to a kind of large-diameter pressure pipeline pipe shaft well permanent and temporary combination structure, belong to pipeline construction field. Including pipe shaft (1), pressure main pipe (7), surge tank (22), water replenishing pipe (12) and water delivery branch pipe (13), surge tank (22) is located in pipe shaft (1), lower end is sleeved on pressure main pipe (7), water replenishing pipe (12) one end is connected with surge tank (22), other end is equipped with tee piece (9), tee piece (9) one end is connected with surge tank (22) by water delivery branch pipe (13), other end is connected with pressure main pipe (7), water replenishing pipe (12) is equipped with water replenishing butterfly valve, water delivery branch pipe (13) is equipped with check valve (15).The structure not only guarantees pipeline water hammer protection, but also relieves the cost of surge tank (22) setting alone, land increase, avoid waste. Solve the problem of high engineering cost of existing pipe shaft (1) and surge tank (22) setting alone, not comprehensive utilization.

Description

Technical Field

[0001] This utility model relates to a permanent and temporary combined structure for a large-diameter pressure pipeline jacking well, belonging to the field of pipeline construction. Background Technology

[0002] Pipe jacking technology for large-diameter pressure pipelines has been widely used in urban pipeline construction. To prevent water hammer damage, pressure regulating measures are required. Pressure regulating wells are the mainstream pressure regulating measure for large-diameter pipelines. However, traditional pipe jacking pressure regulating wells are generally set up independently, which has the following problems: 1. Traditional pressure regulating wells require both temporary and permanent land use, making land use approval extremely difficult; 2. The diameter of the pipe jacking working shaft is usually 10-20m, requiring temporary or permanent land use. If there is a need for operation and maintenance in the future, it is often reserved as an inspection shaft to provide access for personnel or equipment; if there is no need for operation and maintenance in the future, it usually needs to be backfilled to avoid safety hazards.

[0003] The main structural and construction schemes for water hammer protection in urban areas at present are as follows: 1. A bidirectional surge tank is used, positioned in areas of the pipeline where negative pressure may occur. Its primary purpose is to prevent negative pressure from forming in the pressurized pipeline. If the pressure in the pipeline decreases, the surge tank quickly replenishes water to prevent water column separation. The bidirectional surge tank and the pipe jacking working shaft are independent of each other and are located at a certain distance.

[0004] 2. A one-way pressure regulating water tank is used, installed at locations in the pipeline prone to negative pressure. The tank is connected to the main pipeline of the pumping station via a check valve. When the pump starts, the check valve is closed, and water is supplied to the tank through the make-up water pipe. Once the water level reaches the normal level, the float valve at the outlet of the make-up water pipe closes, automatically maintaining the water level in the tank. After an emergency pump shutdown, if the pressure in the outlet pipeline drops below the normal water level in the tank, the check valve quickly opens, supplying water to the main pipeline through the auxiliary branch pipe, thus preventing water column separation due to pressure reduction. The one-way pressure regulating water tank is independent of the jacking shaft and is located at a certain distance from it.

[0005] However, the aforementioned existing technologies have the following drawbacks: 1. Consumption of Land Resources: When the pressure in a pressure pipeline is high, the elevation of the top of the bidirectional surge tank needs to be increased to the pressure head line. In urban pressure pipelines, the pressure head line elevation is often higher than the ground surface, so the surge tank also needs to be higher than the ground surface, thus occupying permanent surface land and overhead space. For unidirectional surge tanks, if they are installed separately, they also require permanent surface land; if they are buried, additional temporary construction land is required.

[0006] 2. Structural waste: The diameter of the pipe jacking working shaft is usually 10 to 20m. The space inside the shaft can provide sufficient volume for the water volume required for pipeline pressure regulation, but at present, this space is not fully utilized, resulting in structural waste of the pipe jacking shaft.

[0007] 3. Increased project cost: The separate construction of the pipe jacking working shaft and the pressure regulating shaft, without consideration for comprehensive utilization, has led to an increase in project cost.

[0008] Furthermore, while there are existing cases of modifying pipe jacking wells, most of them are simple structures such as inspection wells and valve wells, and there has been no attempt to integrate the pipe jacking working well with the pressure regulating well. Utility Model Content

[0009] The technical problem to be solved by this utility model is that existing pipe jacking wells and pressure regulating wells are set up separately without considering comprehensive utilization, which increases the project cost.

[0010] The technical solution adopted by this utility model to solve its technical problem is: a permanent and temporary combined structure of a large-diameter pressure pipeline jacking well, including a jacking well and a pressure main pipe, the pressure main pipe being installed in the lower part of the jacking well, and also including a pressure regulating well, a water supply pipe and a water transmission branch pipe. The pressure regulating well is a barrel-shaped structure and is installed inside the jacking well. The lower closed end of the pressure regulating well is sleeved on the pressure main pipe. One end of the water supply pipe is connected to the upper part of the pressure regulating well, and the other end is connected to a tee fitting. One end of the tee fitting is connected to the lower part of the pressure regulating well through the water transmission branch pipe, and the other end is connected to the pressure main pipe. A water supply butterfly valve is installed on the water supply pipe, and a check valve is installed on the water transmission branch pipe.

[0011] In the above structure, the pressure regulating well is formed by secondary casting using the inner wall of one side of the jacking well as the side wall, and a water-stopping component is provided at the contact end between the casting end of the pressure regulating well and the inner wall of the jacking well.

[0012] In the above structure, the pressure regulating well and the jacking well are covered with a cover plate at the top, and the cover plate is provided with a sealable manhole, and a ladder is provided inside the manhole.

[0013] An overflow pipe is provided on the upper side wall of the pressure regulating well in the above structure.

[0014] The pressure regulating well described above is equipped with a liquid level signal device and a liquid level sensor.

[0015] The water supply butterfly valve in the above structure includes a manual water supply butterfly valve and an electric water supply butterfly valve, and a manual water supply butterfly valve is installed on the water supply branch pipe.

[0016] In the above structure, the lower end of the jacking well is filled with plain concrete for sealing the bottom.

[0017] Furthermore, in the above structure, a base plate is poured on the upper end of the plain concrete sealing layer, and the lower end of the pressure regulating well is poured on the base plate.

[0018] Furthermore, a water collection ditch is provided on the base plate of the above structure.

[0019] Furthermore, in the above structure, water-stop sleeves are provided at the pipe penetration points of the pressure main pipe and the pressure regulating well, the pipe penetration points of the pressure main pipe and the jacking well, the pipe penetration points of the water supply pipe and the pressure regulating well, and the pipe penetration points of the overflow pipe and the pressure regulating well.

[0020] The beneficial effects of this utility model are: 1. Strong structural applicability: Large-diameter pipe jacking wells typically have a large inner diameter, and the space inside the well can provide sufficient volume for pipeline pressure regulation. The determination of the main structural parameters of the pipe jacking well is based on the actual pressure main pipe conditions, construction machinery, and pressure regulation calculation results. Furthermore, the volume of the water storage area will be reviewed and adjusted to ensure that the structural design matches the actual needs, making it more applicable. 2. Space and cost optimization: The use of a combined permanent and temporary pipe jacking structure enables the integrated layout of pipe jacking wells and surge tanks, eliminating the need for separate surge tank construction and saving land space and engineering construction costs; 3. High land utilization rate: It can restore the land space on the top of the well, so that the land originally occupied by the pipe jacking well can be reused, thereby improving the comprehensive utilization rate of the land; 4. Highly efficient construction procedures: The construction process is clearly defined and well-organized, and construction is carried out according to the established steps, which facilitates construction organization and management, improves construction efficiency, and ensures construction quality; 5. Simple operation and control: The operation mode is well-considered, covering various situations such as normal operation, emergency pump shutdown, and well maintenance. It ensures water volume regulation during normal operation of the pump station, effectively prevents water column separation in the pipeline during emergency pump shutdown, and facilitates operation and timely drainage of accumulated water during well maintenance, thereby improving the safety and reliability of the entire system operation. Attached Figure Description

[0021] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0022] Figure 2 This is a top view of the structure of this utility model.

[0023] Figure 3 This is a construction flowchart for this utility model.

[0024] The markings in the diagram are as follows: 1 is the jacking well, 2 is the bottom sealing concrete, 3 is the base slab, 4 is the water collection ditch, 5 is the second-stage concrete, 6 is the cover plate, 7 is the pressure main pipe, 8 is the main pipe tee, 9 is the tee fitting, 10 is the manual water supply butterfly valve, 11 is the electric water supply butterfly valve, 12 is the water supply pipe, 13 is the water delivery branch pipe, 14 is the water stop sleeve, 15 is the manual water delivery pipe butterfly valve, 16 is the check valve, 17 is the liquid level signal device, 18 is the liquid level sensor, 19 is the water stop fitting, 20 is the overflow pipe, 21 is the control area, 22 is the pressure regulating well, 23 is the manhole, 24 is the ladder, and 25 is the well top backfill. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figures 1 to 3As shown, the permanent and temporary combined structure of the large-diameter pressure pipeline jacking well of this utility model includes a jacking well 1 and a pressure main pipe 7. The pressure main pipe 7 is installed in the lower part of the jacking well 1. It also includes a pressure regulating well 22, a water supply pipe 12, and a water delivery branch pipe 13. The pressure regulating well 22 has a barrel-shaped structure and is installed inside the jacking well 1. The lower closed end of the pressure regulating well 22 is sleeved on the pressure main pipe 7. One end of the water supply pipe 12 is connected to the upper part of the pressure regulating well 22, and the other end is connected to a tee fitting 9. One end of the tee fitting 9 is connected to the lower part of the pressure regulating well 22 through the water delivery branch pipe 13, and the other end is connected to the pressure main pipe 7. A water supply butterfly valve is installed on the water supply pipe 12, and a check valve 16 is installed on the water delivery branch pipe 13. Those skilled in the art will understand that this structure, based on the problem of water hammer protection for pressure pipelines, is designed for pipe jacking projects in densely populated urban areas with limited land use. It ensures adequate water hammer protection measures while mitigating the increased costs and land occupation caused by separately installing a surge tank 22, and avoids waste of urban underground space and building materials. Specifically, a surge tank 22 is installed within the existing surge tank 1. The actual inner diameter of the surge tank 1 should be determined based on the length of the main pressure pipe 7 and the dimensions of the pipe jacking machinery. Then, based on pressure pipeline protection calculations, the required water storage capacity of the surge tank 22 and the diameter of the water supply branch pipe 13 are determined. Finally, considering the inner diameter of the surge tank 1, the volume of the water storage area is checked to ensure it meets the regulation requirements. If not, the dimensions of the surge tank 1 can be adjusted accordingly to meet the common requirements of both the surge tank 1 and the surge tank 22. Since water needs to be injected into the surge tank 22, it is preferable that the surge tank 22 be a barrel-shaped structure with an open top. For safety and passage requirements, a cover plate 6 should be installed at the top of both the jacking well 1 and the surge tank 22, followed by secondary backfilling 25. The closed end of the surge tank 22 is fitted onto the pressure main pipe 7, and its inner bottom surface should be located above the pressure main pipe 7. One end of the water supply pipe 12 is connected to the upper part of the surge tank 22, and the other end is connected to a tee fitting 9. That is, one end of the tee fitting 9 is open and connected to the water supply pipe 12. One end of the remaining two openings of the tee fitting 9 is connected to the lower part of the surge tank 22 through a water supply branch pipe 13, and the other end is connected to the pressure main pipe 7. For convenient connection to the pressure main pipe 7, a main pipe tee fitting 8 can be installed on the pressure main pipe 7. At the same time, a water supply butterfly valve is installed on the water supply pipe 12, and a check valve 16 is installed on the water supply branch pipe 13.

[0027] Preferably, in the above structure, the surge tank 22 is formed by secondary casting using the inner wall of one side of the jacking well 1 as its sidewall, and a water-stopping element 19 is provided at the contact end between the casting end of the surge tank 22 and the inner wall of the jacking well 1. Those skilled in the art will understand that this structure is further preferably formed by secondary casting of the surge tank 22, specifically by secondary casting using the inner wall of one side of the jacking well 1 as its sidewall to form a barrel-shaped surge tank 22 with an open top. Simultaneously, to ensure a tight connection between the secondary cast concrete and the original inner wall of the jacking well 1 to prevent leakage, this structure further specifies that a water-stopping element 19 is provided at the contact end between the casting end of the surge tank 22 and the inner wall of the jacking well 1. The water-stopping element 19 can specifically be a water-stopping strip, grouting water-stopping material, or waterproof adhesive, etc.

[0028] Preferably, in the above structure, a cover plate 6 is cast at the upper end of the surge tank 22 and the jacking shaft 1. A sealable manhole 23 is provided on the cover plate 6, and a ladder 24 is installed inside the manhole 23. Those skilled in the art will understand that, for safety reasons, it is preferable to cast a cover plate 6 at the upper end of the surge tank 22 and the jacking shaft 1, and to backfill the top of the well 25 on the cover plate 6. For ease of maintenance, a sealable manhole 23 is provided on the cover plate 6, and a ladder 24 is installed inside the manhole 23. Preferably, there are two manholes 23, specifically one at the upper end of the surge tank 22 and one at the upper end of the jacking shaft 1 on one side of the surge tank 22. The interior of the jacking shaft 1 on one side of the surge tank 22 is the control area 21.

[0029] Preferably, an overflow pipe 20 is provided on the upper side wall of the surge tank 22 in the above structure. Those skilled in the art will understand that, in order to ensure a constant water level in the surge tank 22, it is practically preferable to provide an overflow pipe 20 on the upper side wall of the surge tank 22, through which excess water is actually discharged to ensure the safety of the surge tank 22.

[0030] Preferably, the pressure regulating well 22 in the above structure is equipped with a liquid level signal device 17 and a liquid level sensor 18. Those skilled in the art will understand that, in order to achieve remote operation, this device preferably includes a liquid level signal device 17 and a liquid level sensor 18 inside the pressure regulating well 22. In practice, the liquid level sensor 18, liquid level signal device 17, electric water supply butterfly valve 11, and check valve 16 work together to achieve automated control of water supply during operation and water delivery during pump shutdown, reducing management costs.

[0031] Preferably, the water supply butterfly valve in the above structure includes a manual water supply butterfly valve 10 and a power water supply butterfly valve 11, and a manual water supply butterfly valve 15 is provided on the water supply branch pipe 13. Those skilled in the art will understand that, more preferably, this structure includes a manual water supply butterfly valve 10 and a power water supply butterfly valve 11, with remote control achieved through the power water supply butterfly valve 11. A manual water supply butterfly valve 15 is also provided on the water supply branch pipe 13 upstream of the check valve 16 to ensure operational safety.

[0032] Preferably, the lower end of the jacking shaft 1 in the above structure is filled with sealing plain concrete 2. Those skilled in the art will understand that this structure further includes sealing plain concrete 2 at the lower end of the jacking shaft 1 to maintain a dry internal environment and prevent water seepage from affecting equipment use.

[0033] Preferably, in the above structure, a base plate 3 is poured on the upper end of the sealing concrete 2, and the lower end of the surge tank 22 is poured on the base plate 3. Those skilled in the art will understand that further pouring a base plate 3 on the upper end of the sealing concrete 2 and pouring the lower end of the surge tank 22 on the base plate 3 ensures the stability of the casting structure of the surge tank 22, and further increases the internal structural strength of the jacking shaft 1.

[0034] Preferably, a water collection ditch 4 is provided on the base plate 3 in the above structure. Those skilled in the art will understand that this structure further provides a water collection ditch 4 on the base plate 3 to collect water and maintain a dry environment inside the jacking well 1.

[0035] Preferably, in the above structure, water-stop sleeves 14 are provided at the pipe penetration points of the pressure main pipe 7 and the surge tank 22, the pipe penetration point of the pressure main pipe 7 and the jacking well 1, the pipe penetration point of the water supply pipe 12 and the surge tank 22, and the pipe penetration point of the overflow pipe 20 and the surge tank 22. Those skilled in the art will understand that, in order to ensure the sealing of the pipe penetration points, this structure specifically designs water-stop sleeves 14 at all pipe penetration points. Specifically, water-stop sleeves 14 are provided at the pipe penetration points of the pressure main pipe 7 and the surge tank 22, the pipe penetration point of the pressure main pipe 7 and the jacking well 1, the pipe penetration point of the water supply pipe 12 and the surge tank 22, and the pipe penetration point of the overflow pipe 20 and the surge tank 22.

[0036] The main construction procedures include the following: 1. Sinking and sealing of the jacking shaft 1: sinking and excavation of the jacking shaft 1, pouring of plain concrete 2 for sealing the bottom, pouring of the bottom slab 3, and pre-reservation of the drainage ditch 4; 2. Pipe jacking construction: jacking construction of pressure main pipe 7, installation of pressure main pipe 7 inside the second-phase concrete 5; 3. Second-stage concrete pouring: waterstop sleeve 14 pre-embedded, second-stage concrete pouring 5, waterstop 19 installed; 4. Installation of pressure regulation control system: Main pipe tee 8, branch pipe tee 9, manual water supply butterfly valve 10, electric water supply butterfly valve 11, water supply pipe 12, water delivery branch pipe 13, manual water delivery pipe butterfly valve 15, check valve 16, liquid level signal device 17, liquid level sensor 18. 5. Backfilling of the jacking shaft 1: pouring of cover plate 6, pouring of manhole 23, installation of ladder 24, and backfilling of the shaft top 25.

[0037] Operating mode 1. During normal operation of the pumping station: The water pump starts running, the manual butterfly valve 10 for water supply opens, the electric butterfly valve 11 for water supply opens, the manual butterfly valve 15 for water delivery opens, and the check valve 16 automatically closes. Water in the main pressure pipe 7 flows into the storage area through the water supply pipe 12, and the water level in the storage area is monitored by the level sensor 18. Once the water level in the storage area reaches the design level, the level signal device 17 releases a signal to control the electric butterfly valve 11 to close. Water exceeding the design level is discharged via the overflow pipe 20. 2. Pump shutdown in case of an accident: When the pressure in the main pressure pipe 7 drops below the normal water level in the storage area during an accident, the check valve 16 will automatically open and replenish water to the main pressure pipe 7 through the water supply branch pipe 13 to prevent water column separation in the pipeline due to pressure reduction. 3. Well maintenance: When the pipelines and accessories in the control area 21 need maintenance, the well control area 21 can be entered through the manhole 23 along the ladder 24. Maintenance can only be carried out after the water supply pipe and water delivery pipe butterfly valve are closed by the water supply manual butterfly valve 10. A water collection ditch 4 is set in the well, and the water accumulated in the ditch can be pumped out of the well by a water pump.

Claims

1. A permanent and temporary combined structure for a large-diameter pressure pipeline jacking shaft, comprising a jacking shaft (1) and a pressure main pipe (7), wherein the pressure main pipe (7) is installed in the lower part of the jacking shaft (1), characterized in that: It also includes a pressure regulating well (22), a water supply pipe (12), and a water transmission branch pipe (13). The pressure regulating well (22) is a barrel-shaped structure and is installed inside the jacking well (1). The lower closed end of the pressure regulating well (22) is sleeved on the pressure main pipe (7). One end of the water supply pipe (12) is connected to the upper part of the pressure regulating well (22), and the other end is connected to a tee fitting (9). One end of the tee fitting (9) is connected to the lower part of the pressure regulating well (22) through the water transmission branch pipe (13), and the other end is connected to the pressure main pipe (7). A water supply butterfly valve is installed on the water supply pipe (12), and a check valve (16) is installed on the water transmission branch pipe (13).

2. The permanent and temporary combined structure of the large-diameter pressure pipeline jacking well according to claim 1, characterized in that: The pressure regulating well (22) is formed by secondary casting with the inner wall of one side of the jacking well (1) as the side wall, and a water-stopping component (19) is provided at the end of the pressure regulating well (22) that contacts the inner wall of the jacking well (1).

3. The permanent and temporary combined structure of the large-diameter pressure pipeline jacking well according to claim 1, characterized in that: The pressure regulating well (22) and the jacking well (1) are covered with a cover plate (6), and a sealable manhole (23) is provided on the cover plate (6), and a ladder (24) is provided inside the manhole (23).

4. The permanent and temporary combined structure of the large-diameter pressure pipeline jacking well according to claim 1, characterized in that: An overflow pipe (20) is provided on the upper side wall of the pressure regulating well (22).

5. The permanent and temporary combined structure of the large-diameter pressure pipeline jacking well according to claim 1, characterized in that: The pressure regulating well (22) is equipped with a liquid level signal device (17) and a liquid level sensor (18).

6. The permanent and temporary combined structure of the large-diameter pressure pipeline jacking well according to claim 1, characterized in that: The water supply butterfly valve includes a manual water supply butterfly valve (10) and a power water supply butterfly valve (11), and a manual water supply butterfly valve (15) is provided on the water supply branch pipe (13).

7. The permanent and temporary combined structure of the large-diameter pressure pipeline jacking well according to claim 1, characterized in that: The bottom of the jacking well (1) is filled with plain concrete (2) for sealing.

8. The permanent and temporary combined structure of the large-diameter pressure pipeline jacking well according to claim 7, characterized in that: The bottom plain concrete (2) is topped with a base plate (3), and the bottom of the pressure regulating well (22) is topped with a base plate (3).

9. The permanent and temporary combined structure of the large-diameter pressure pipeline jacking well according to claim 8, characterized in that: A water collection ditch (4) is provided on the bottom plate (3).

10. The permanent and temporary combined structure of the large-diameter pressure pipeline jacking well according to claim 4, characterized in that: Water-stop sleeves (14) are provided at the pipe penetration points of the pressure main pipe (7) and the pressure regulating well (22), the pipe penetration points of the pressure main pipe (7) and the jacking well (1), the pipe penetration points of the water supply pipe (12) and the pressure regulating well (22), and the pipe penetration points of the overflow pipe (20) and the pressure regulating well (22).

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