Large-diameter water supply pipe emptying device in shield tunnel

Abstract

The application discloses a large-diameter water supply pipeline emptying facility in a shield tunnel, which comprises an emptying pipeline, a plurality of emptying pumps and a water lifting pipeline; a water supply cabin of the shield tunnel is provided with a water supply pipeline, and an equipment cabin is provided with all the emptying pumps; the height of the water inlet of each emptying pump is not higher than that of the water supply pipeline; the emptying pipeline comprises an emptying main pipe and a water outlet branch pipe; the emptying main pipe is arranged in the water supply cabin and is communicated with the water supply pipeline through an emptying pipeline; each water outlet branch pipe is arranged at the bottom of the shield tunnel, one end of each water outlet branch pipe is connected with the emptying main pipe, and the other end of each water outlet branch pipe is connected with the inlet of the corresponding emptying pump; the water lifting pipeline comprises a number of water lifting branch pipes matched with the emptying pumps and a water lifting main pipe; one end of each water lifting branch pipe is connected with the outlet of the corresponding emptying pump, and the other end of each water lifting branch pipe is connected with the water lifting main pipe; the water lifting main pipe is connected with a tunnel waste water pump house of the shield tunnel. The application efficiently, economically and safely solves the emptying problem of the large-diameter water supply pipeline in the tunnel when the pipeline needs to be overhauled.

Description

Technical Field

[0001] This invention relates to the field of water pipeline construction technology in shield tunnels, and particularly to a venting facility for large-diameter water supply pipelines in shield tunnels. Background Technology

[0002] The upper part of the ultra-large diameter circular shield tunnel is for vehicle traffic, and the lower part, in addition to housing various tunnel-specific facilities such as maintenance passages, power and communication lines, power distribution rooms, and wastewater pumping stations, still has ample space. Laying large-diameter water supply pipelines within the tunnel provides a safe and convenient passage across the sea or river, which can better realize the economic and social benefits of the tunnel project.

[0003] To better ensure the safety of water supply pipeline laying in the tunnel and to facilitate pipeline maintenance, venting facilities need to be installed in the tunnel's water supply chamber.

[0004] Large-diameter water supply pipelines typically installed exposed within utility tunnels have drain valves at their lowest points to facilitate drainage in conjunction with the tunnel's wastewater drainage system. Compared to the more mature drainage facilities for water supply pipelines in utility tunnels, the drainage system for large-diameter water supply pipelines in shield tunnels has the following characteristics:

[0005] (1) The water supply pipeline is laid along the shield tunnel. It is long and has few low points. In order to facilitate maintenance and venting and shorten the venting time, it is necessary to reasonably divide it by setting valves.

[0006] (2) When using the tunnel drainage system for drainage, it is necessary to consider the matching of the drainage flow rate with the drainage system flow rate, and also to consider the emergency drainage needs.

[0007] (3) The space under the tunnel is relatively small, and the space for the venting pipes and pumping stations is limited. It is necessary to ensure proper connection with various equipment and facilities under the tunnel.

[0008] Therefore, in order to ensure the safe operation of the pipeline and facilitate maintenance, how to safely, reliably, conveniently and quickly drain the water supply pipeline in the shield tunnel has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] In view of the above-mentioned deficiencies of the prior art, the present invention provides a venting device for large-diameter water supply pipelines in shield tunnels, which aims to solve the problem of venting large-diameter water supply pipelines in tunnels when maintenance is required in an efficient, economical and safe manner.

[0010] To achieve the above objectives, the present invention discloses a venting device for a large-diameter water supply pipeline in a shield tunnel; a water supply pipeline is provided inside the shield tunnel; before the water supply pipeline is inspected and repaired, the water in the water supply pipeline is vented through the venting device.

[0011] The venting facility includes a venting pipeline, multiple venting pumps, and a water pumping pipeline;

[0012] The shield tunnel has a water supply chamber and an equipment chamber extending along its length on both sides near the bottom. The water supply chamber on one side is equipped with the water supply pipe, and the maintenance platform of the equipment chamber on the other side is equipped with all the air venting pumps at intervals along its length.

[0013] The height of the inlet of each of the aforementioned venting pumps is not higher than that of the water supply pipe;

[0014] The venting pipeline includes a main venting pipe and a number of outlet branch pipes matching the number of the venting pump;

[0015] The venting main pipe is installed inside the water supply chamber, parallel to the water supply pipeline, and connected to the water supply pipeline through the venting pipe;

[0016] Each of the aforementioned water outlet branch pipes is located at the bottom of the shield tunnel, with one end connected to the main venting pipe and the other end connected to the inlet of the corresponding venting pump.

[0017] The water supply pipeline includes a number of water supply branch pipes matching the number of air venting pumps, and a main water supply pipe;

[0018] One end of each of the aforementioned water supply branch pipes is connected to the outlet of the corresponding air venting pump, and the other end is connected to the main water supply pipe.

[0019] The main water supply pipe is connected to the tunnel wastewater pumping station of the shield tunnel.

[0020] Preferably, each of the water outlet branch pipes is made of welded steel, and its shape matches the concave shape of the bottom of the shield tunnel, and it is buried in the cushion layer at the bottom of the shield tunnel.

[0021] Preferably, the water supply pipeline is a welded steel pipe, which enters the shield tunnel from the working shafts at both ends of the shield tunnel, and the supporting facilities include supports and piers.

[0022] Preferably, two limiting expansion joints are symmetrically arranged on the venting main pipe.

[0023] Preferably, the venting pipe that connects to the water supply pipe is equipped with a water inlet valve;

[0024] The vent pipe is located diagonally below the water supply pipe, making the vent pipe form a 45° angle with the horizontal plane.

[0025] Preferably, the water supply pipeline is divided into multiple venting sections of 800 to 1000 meters by a hand-operated and electric-operated butterfly valve;

[0026] Each of the aforementioned venting sections is equipped with one of the aforementioned venting facilities.

[0027] Preferably, each of the water supply branch pipes is equipped with a check valve and a gate valve.

[0028] Preferably, all the vent pumps are divided into at least two groups; each group of multiple vent pumps is equipped with one of the water delivery pipelines.

[0029] Preferably, each of the water supply pipelines is equipped with a backflow preventer in its main water supply pipe.

[0030] Preferably, the tunnel wastewater pump room is equipped with multiple wastewater pumps and wastewater drainage pipelines, through which the internal water is discharged.

[0031] The beneficial effects of this invention are:

[0032] This invention provides an efficient, economical, and safe solution to the problem of air leakage when large-diameter water supply pipelines in tunnels require maintenance.

[0033] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0034] Figure 1 A schematic diagram of a water supply pipe connection structure is shown in one embodiment of the present invention.

[0035] Figure 2 A schematic diagram of the cross-section of a shield tunnel is shown in one embodiment of the present invention.

[0036] Figure 3 A schematic diagram of the venting facility in one embodiment of the present invention is shown. Detailed Implementation

[0037] Example

[0038] like Figures 1 to 3 As shown, a large-diameter water supply pipeline venting device 2 is installed inside the shield tunnel; a water supply pipeline 1 is installed inside the shield tunnel; before the water supply pipeline 1 is inspected, the water in the water supply pipeline 1 is vented through the venting device 2.

[0039] Among them, the venting facility 2 includes a venting pipeline, multiple venting pumps 24 and a water pumping pipeline 27;

[0040] Near the bottom of the shield tunnel, there are water supply chambers and equipment chambers extending along the length on both sides; one side of the water supply chamber is equipped with a water supply pipe 1, and the maintenance platform of the equipment chamber on the other side is equipped with all the air venting pumps 24 at intervals along the length.

[0041] The height of the inlet of each venting pump 24 is no higher than that of the water supply pipe 1;

[0042] The venting pipeline includes a main venting pipe 22 and a number of outlet branch pipes 23 matching the number of venting pumps 24;

[0043] The vent pipe 22 is installed inside the water supply chamber, parallel to the water supply pipe 1, and connected to the water supply pipe 1 through the vent pipe;

[0044] Each water outlet branch pipe 23 is installed at the bottom of the shield tunnel, with one end connected to the main venting pipe 22 and the other end connected to the inlet of the corresponding venting pump 24.

[0045] The water supply pipeline 27 includes water supply branch pipes in number matching the air venting pump 24, as well as a main water supply pipe;

[0046] One end of each water supply branch pipe is connected to the outlet of the corresponding air venting pump 24, and the other end is connected to the main water supply pipe.

[0047] The main water supply pipe is connected to the tunnel wastewater pumping station 5 of the shield tunnel.

[0048] In practical applications, the venting main pipe 22 and the water supply pipe 1 are placed in the water supply chamber of the lower layer of the shield tunnel, and the venting pump 24 is located in the maintenance platform of the equipment chamber on the opposite side, adjacent to the wastewater pumping station 5 at the lowest point of the tunnel.

[0049] Each air venting pump 24 can be equipped with a hook for easy lifting and transportation of the equipment.

[0050] In some embodiments, each outlet branch pipe 23 is made of welded steel, with an shape that matches the concave shape of the bottom of the shield tunnel, and is buried in the cushion layer at the bottom of the shield tunnel.

[0051] In practical applications, in order to adapt to the tunnel cross-section, the water outlet branch pipe 23 of the venting component 2 is made of welded steel pipe, which can be welded in an arc shape according to the tunnel cross-section and buried in the lower cushion layer of the tunnel to adapt to the arc shape of the tunnel bottom.

[0052] Each venting branch pipe 23 is made of welded steel pipe and laid in an arc shape in the concrete cushion layer to adapt to the space under the shield tunnel.

[0053] In some embodiments, the water supply pipe 1 is a welded steel pipe that enters the shield tunnel from the working shafts 4 at both ends of the shield tunnel, and the supporting facilities include supports and piers.

[0054] In some embodiments, two limit expansion joints are symmetrically arranged on the venting main pipe 22.

[0055] In practical applications, the limit expansion joint can prevent the water supply pipe 1 from slipping in the longitudinal direction of the tunnel and pulling off the venting facility 2, thereby preventing damage to the venting system.

[0056] In some embodiments, the venting main pipe 22 is connected to the water supply pipe 1 and is equipped with a water inlet valve 21;

[0057] The venting main pipe 22 is located diagonally below the water supply pipe 1, making the venting pipe form a 45° angle with the horizontal plane.

[0058] The venting main pipe 22 of this invention is located diagonally below the water supply pipe 1, with an inclination angle of approximately 45°.

[0059] Each venting branch pipe 23 is connected from the lower part of the venting main pipe 22, which can realize the complete venting of the pipeline.

[0060] In some embodiments, the water supply pipeline 1 is divided into multiple venting sections of 800 to 1000 meters by a hand-operated and electric butterfly valve 3;

[0061] Each venting section is equipped with a venting facility 2.

[0062] In some embodiments, each water supply branch is equipped with a check valve 25 and a gate valve 26.

[0063] In some embodiments, all the vent pumps 24 are divided into at least two groups; each group of multiple vent pumps 24 is equipped with a water supply line 27.

[0064] In some embodiments, each water supply pipe 27 is equipped with a backflow preventer 28.

[0065] In practical applications, a check valve 25 and a gate valve 26 are installed on the outlet pipe of each air venting pump 24, and a backflow preventer 28 is installed on the pumping pipe of the air venting pump to prevent water pollution.

[0066] In some embodiments, the tunnel wastewater pumping station 5 is equipped with multiple wastewater pumps 51 and wastewater drainage pipes 52, through which the internal water is discharged.

[0067] Under normal operating conditions, water supply pipe 1 is flowing normally, the manual / electric butterfly valve 3 of water supply pipe 1 is in the open state, and the inlet valve 21 of the venting device 2 is in the closed state.

[0068] When venting is required, the hand-operated and electric butterfly valve 3 of the venting section of water supply pipeline 1 that needs to be vented can be closed remotely or manually on-site, and water supply pipeline 1 will stop supplying water.

[0069] When the inlet valve 21 is opened, the tap water in the pipe automatically enters the venting pump 24. After the venting pump 24 is started, it lifts the water stored in the corresponding venting section to the tunnel wastewater pumping station 5. After being lifted by the wastewater pump 51 installed in the tunnel wastewater pumping station 5, it is discharged to the outside of the tunnel through the tunnel wastewater drainage pipe 52.

[0070] Generally, six air release pumps 24 can be equipped, divided into two groups. Each group has three air release pumps 24, two of which are in use and one is on standby. The air release water is lifted to the tunnel wastewater pump room 5 through two water supply pipelines 27.

[0071] The six air release pumps are set up as two relatively independent pump groups, which can better ensure the safe operation of the air release system and avoid the reduction of the total water delivery capacity of the system caused by too many pumps connected in parallel on a single water supply pipe.

[0072] The hand-operated and electric butterfly valve 3 of the present invention can be remotely or manually controlled at the control center. When the water supply main pipe 1 needs to be vented, the corresponding hand-operated and electric butterfly valve 3 on the water supply main pipe 1 can be closed as needed, and the inlet valve 21 for venting can be opened to realize the switching from the normal water supply condition to the venting condition.

[0073] After the venting is activated, the venting pump 24 begins to receive water and starts, raising the venting water to the tunnel wastewater pumping station 5. The water level in the collection pool of the tunnel wastewater pumping station 5 gradually rises to the starting water level of the wastewater pump 51, and the wastewater pump 51 begins to discharge water out of the tunnel, thus discharging the venting water outside the tunnel.

[0074] The diameter of the main venting pipe 22 is about 1 / 3 of that of the water supply pipe 1. Depending on the venting pipe section, the venting time is about 2 to 5 hours.

[0075] The main venting pipe 22 is divided into 6 venting branch pipes 23, each with a corresponding 6 venting pumps 24.

[0076] The total drainage capacity of all the venting pumps 24 is the same as that of the tunnel wastewater pumping station 5, which is about 120L / s, and can economically and efficiently vent the water supply main.

[0077] All control signals for the electric valves are connected to the tunnel management center, which can monitor the operating status of the main water supply pipe and the venting facility 2 in real time.

[0078] To further ensure the safe operation of the venting facility 2 and avoid a decrease in discharge flow due to a large number of pumps operating in parallel, the multiple venting pumps 24 are configured as two relatively independent pump sets. The venting pump station will cease operation when the water level in the main water supply pipe drops below the minimum operating level of the venting pump set. The small amount of water remaining in the main pipe will be discharged through the seepage drainage system installed in the main tunnel structure.

[0079] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A venting device for a large-diameter water supply pipeline inside a shield tunnel; a water supply pipeline (1) is provided inside the shield tunnel; before maintenance of the water supply pipeline (1), the water inside the water supply pipeline (1) is vented through the venting device (2); characterized in that, The venting facility (2) includes a venting pipeline, multiple venting pumps (24) and a water pumping pipeline (27). The shield tunnel has a water supply chamber and an equipment chamber extending along its length on both sides near the bottom. The water supply chamber on one side is equipped with the water supply pipe (1), and the maintenance platform of the equipment chamber on the other side is equipped with all the air venting pumps (24) at intervals along its length. The height of the inlet of each of the aforementioned air venting pumps (24) is not higher than that of the water supply pipe (1); The venting pipeline includes a venting main pipe (22) and a number of outlet branch pipes (23) matching the number of the venting pump (24). The vent pipe (22) is installed inside the water supply chamber, parallel to the water supply pipe (1), and connected to the water supply pipe (1) through the vent pipe; Each of the aforementioned outlet branch pipes (23) is located at the bottom of the shield tunnel, with one end connected to the main venting pipe (22) and the other end connected to the inlet of the corresponding venting pump (24); The water supply pipeline (27) includes a number of water supply branch pipes matching the number of the air venting pump (24), and a main water supply pipe; One end of each of the aforementioned water supply branch pipes is connected to the outlet of the corresponding air venting pump (24), and the other end is connected to the water supply main pipe; The main water supply pipe is connected to the tunnel wastewater pumping station (5) of the shield tunnel; Each of the aforementioned water outlet branch pipes (23) is a welded steel pipe, the shape of which matches the concave shape of the bottom of the shield tunnel, and is buried in the cushion layer at the bottom of the shield tunnel. The water supply pipeline (1) is a welded steel pipe, which enters the shield tunnel from the working shafts (4) at both ends of the shield tunnel. The supporting facilities include supports and piers. Two limit expansion joints are symmetrically arranged on the venting main pipe (22).

2. The venting device for large-diameter water supply pipelines in shield tunnels according to claim 1, characterized in that, The venting main pipe (22) is connected to the water supply pipe (1) and the venting pipe is equipped with an inlet valve (21). The vent pipe (22) is located diagonally below the water supply pipe (1), so that the vent pipe forms a 45° angle with the horizontal plane.

3. The venting device for large-diameter water supply pipelines in shield tunnels according to claim 1, characterized in that, The water supply pipeline (1) is divided into multiple venting sections of 800 to 1000 meters by a hand-operated and electric butterfly valve (3); Each of the aforementioned venting sections is equipped with one of the aforementioned venting facilities (2).

4. The venting device for large-diameter water supply pipelines in shield tunnels according to claim 1, characterized in that, Each of the aforementioned water supply branch pipes is equipped with a check valve (25) and a gate valve (26).

5. The venting device for large-diameter water supply pipelines in shield tunnels according to claim 1, characterized in that, All of the aforementioned air vent pumps (24) are divided into at least two groups; each group of multiple air vent pumps (24) is equipped with one of the aforementioned water supply lines (27).

6. The venting device for large-diameter water supply pipelines in shield tunnels according to claim 1, characterized in that, Each of the aforementioned water supply pipes (27) is equipped with a backflow preventer (28) in its main water supply pipe.

7. The venting device for large-diameter water supply pipelines in shield tunnels according to claim 1, characterized in that, The tunnel wastewater pump room (5) is equipped with multiple wastewater pumps (51) and wastewater drainage pipes (52), through which the internal water is discharged.

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