An underwater cable pipe laying structure

Abstract

The present invention discloses an underwater cable drainage pipe laying structure, including a cable drainage pipe, leakage drainage equipment, water level monitoring equipment, a drainage pump and a cable well. The cable drainage pipe is laid along the river bottom, and a drainage pipe is led to the leakage water collection well at the lowest point of the cable pipe, and the bottom of the leakage water collection well is connected to the drainage pipe main pipe and the water level monitoring equipment. The drainage pipe main pipe is led to the cable well on the shore along with the cable drainage pipe arrangement and connected to the drainage pump, and discharged to the external drainage system. The pressure gauge type water level gauge is arranged at the bottom of the leakage water collection well to monitor the leakage water level and control the opening and closing of the drainage pump. The water level gauge and the water level gauge power line can use gravity to pull the water level gauge power line to complete the installation and replacement of the water level gauge. The gap between the end of the cable pipe and the cable is sealed with a caulking structure, and a ventilation pipe is buried at the same time to ensure the balance of air pressure inside and outside the cable pipe. The present invention improves the cable operation environment, saves construction period, ensures safety, and has less overall investment increase.

Description

Technical Field

[0001] The invention relates to a cable pipe laying structure, in particular to a cable pipe laying structure with a drainage system and a cross-underpass water system. Background Art

[0002] In water conservancy and hydropower projects, cable conduit laying structures are indispensable structures. When crossing and passing under water systems, cable conduits are often buried in cable channels of traffic bridges. When it is inconvenient to arrange cable conduits in the channels of traffic bridges, riverbed or riverbed laying methods are often adopted. The laying construction methods include jacking pipes, dragging pipes and open excavation and burial of pipes. When water conservancy projects are constructed across water systems, cofferdams are often used to create dry land construction conditions. Open excavation and burial of pipes in foundation pits are simple to construct and have low investment costs. However, the longitudinal direction of the pipeline is usually high on both sides of the river and low in the middle. Once water flows into or seeps into the cable pipe during construction or operation, it is difficult to discharge it. Long-term soaking of cables in water will affect the service life of the cables and make them difficult to repair and replace. Summary of the invention

[0003] In order to solve the difficulties in the above-mentioned background technology, the present invention proposes an underwater cable pipe laying structure, which can effectively solve the problem of water accumulation in the underwater cable pipe, improve the cable operation environment, facilitate construction, improve the durability and safety of the cable, and save the maintenance cost of the cable.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: an underwater cable drainage pipe laying structure, which utilizes the dry land open excavation and buried pipe construction created by the cofferdam, including cable drainage pipes, leakage drainage equipment, water level monitoring equipment, drainage pumps, external drainage pipes and cable wells. The cable drainage pipes are laid along the riverbed ground line and extend to both banks, passing through the revetment retaining wall and extending into the cable well; the cable drainage pipes include cable pipes, reinforced concrete on the outside, lower plain concrete cushion layer, reducing tees, cables, caulking structure and ventilation pipes. The lowest point of the cable drainage pipe is connected to the leakage drainage equipment, and the leakage drainage equipment includes a straight section of drainage pipe, a drainage pipe elbow, a drainage pipe tee, a drainage pipe cross, a drainage pipe main section and a stainless steel plate leakage collection well. A reducing tee is provided at the lowest point of the cable drainage pipe, and a straight section of a drainage pipe, a drainage pipe elbow, a drainage pipe tee and a drainage pipe cross are connected at the reducing tee, and then connected to a stainless steel plate leakage collection well after being collected. The bottom of the stainless steel plate leakage collection well is connected to the main drainage pipe section and the water level monitoring equipment. The main drainage pipe section is led into the cable well along with the cable drainage pipe arrangement, and is finally connected to the drainage pump provided in the cable well. The other side of the drainage pump is connected to the external drainage pipe, and the external drainage pipe is finally led to the drainage system outside the cable well.

[0005] The water level monitoring equipment includes a pressure gauge water level gauge, a water level gauge power cord and a water level gauge delivery pipeline. The pressure gauge water level gauge is arranged at the bottom of the stainless steel plate leakage collection well to monitor the leakage water level and control the opening and closing of the drainage pump. The water level gauge power cord and the water level gauge delivery pipeline are arranged with the cable drainage pipe and led into the cable well.

[0006] The cable well comprises a cable well reinforced concrete structure, a cable well cover, a cable well sump and a maintenance ladder; the cable well cover is located at the top of the cable well reinforced concrete structure and serves as a maintenance manhole cover; the maintenance ladder is used for maintenance personnel to enter and exit the cable well; the cable well sump is located at the bottom of the cable well and is used to collect leakage water in the cable well.

[0007] The gap between the cable pipe and the cable at the end of the cable pipe in the cable well is sealed with a caulking structure to prevent fire, water and small animals. At the same time, a vent pipe is buried in the caulking structure to ensure the balance of air pressure inside and outside the cable pipe when draining the water leakage in the stainless steel plate leakage water collection well.

[0008] The pressure gauge type water level gauge and the water level gauge power cord are transported to the bottom of the stainless steel plate leakage collection well along the water level gauge delivery pipeline by gravity. When inspecting and replacing, the pressure gauge type water level gauge can be extracted through the water level gauge power cord along the water level gauge delivery pipeline.

[0009] The elevation of the end of the cable pipe in the cable well is higher than the water surface line of the river channel to prevent external water from seeping into the cable well and then seeping into the cable pipe through the cable pipe port.

[0010] A drainage pump power line is arranged in the cable well to supply power to the drainage pump.

[0011] The water level meter power line extends outside the cable well and is connected to the power distribution cabinet.

[0012] A cable support and a cable pipe away from the river channel are arranged in the cable well so that the cable can be led out of the cable well.

[0013] The beneficial effects of the present invention are:

[0014] 1. Improve the cable operation environment. The addition of leakage drainage equipment solves the problem of water accumulation in the cable pipe during the construction or operation period, reduces the difficulty of cable protection, greatly improves the operation environment, prolongs the service life of the cable, reduces unnecessary maintenance, and further ensures safety.

[0015] 2. Improve construction conditions and save construction time. The cable pipe is laid in dry land created by the cofferdam, avoiding construction methods such as pipe bridges and drag pipes. At the same time, the cable wells at both ends are also used as working wells to facilitate the later cable insertion, with good construction conditions, convenient construction and short construction period.

[0016] 3. The overall investment increased slightly. Only related drainage facilities such as leakage drainage equipment, water level monitoring equipment, and drainage pumps were added, and the requirements for the cable sheath structure were reduced, so the overall investment increased slightly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a plan layout diagram of an embodiment of the present invention;

[0018] Figure 2 is a longitudinal sectional view of an embodiment of the present invention;

[0019] Figure 3 yes Figure 2 Detailed drawing A, i.e. the connection details of the cable drainage pipe and the leakage drainage equipment;

[0020] Figure 4 yes Figure 2 and Figure 3 AA section view;

[0021] Figure 5 yes Figure 2 and Figure 3 BB cross-sectional view;

[0022] Figure 6 yes Figure 2 Detailed drawing B, i.e. the cable well and its internal structure details;

[0023] Figure 7 yes Figure 6 Detailed drawing C is the detailed drawing of the cable conduit end.

[0024] In the figure: 1-cable drainage pipe; 11-cable pipe; 12-external reinforced concrete; 13-plain concrete cushion; 14-reducing tee; 15-cable; 16-caulking structure; 17-ventilation pipe; 2-leakage drainage equipment; 21-straight section of drainage pipe; 22-elbow of drainage pipe; 23-tee of drainage pipe; 24-four-way of drainage pipe; 25-main section of drainage pipe; 26-stainless steel plate leakage collection well; 3-water level monitoring equipment; 31-pressure gauge type water level gauge; 32-power line of water level gauge; 33-transmission pipeline of water level gauge; 4-drainage pump; 5-external drainage pipeline; 6-cable well; 61-reinforced concrete structure of cable well; 62-cable well cover; 63-cable well collection pit; 64-maintenance ladder; 7-bank retaining wall; 8-river bottom ground line; 9-water surface line. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] like Figure 1 to Figure 7As shown, the present invention proposes an underwater cable pipe laying structure, which utilizes the dry land open excavation and pipe laying construction created by the cofferdam, and includes a cable pipe 1, leakage drainage equipment 2, water level monitoring equipment 3, drainage pump 4, external drainage pipe 5 and cable well 6. The cable pipe 1 is laid along the river bottom ground line 8, and extends to both banks, passes through the revetment retaining wall 7 and extends into the cable well 6; the cable pipe 1 includes a cable pipe 11, an outer reinforced concrete 12, a plain concrete cushion 13, a reducing tee 14, a cable 15 and a caulking structure 16.

[0027] The cable drain pipe 1 is connected to the leakage drainage equipment 2 at the lowest point. The leakage drainage equipment 2 includes a drainage pipe straight pipe section 21, a drainage pipe elbow 22, a drainage pipe tee 23, a drainage pipe cross 24, a drainage pipe main pipe section 25 and a stainless steel plate leakage water collection well 26. A reducing tee 14 is provided at the lowest point of the cable drain pipe 1, and the drainage pipe straight pipe section 21, the drainage pipe elbow 22, the drainage pipe tee 23 and the drainage pipe cross 24 are connected at the reducing tee 14, and then connected to the stainless steel plate leakage water collection well 26 after being collected. The bottom of the stainless steel plate leakage water collection well 26 is connected to the drainage pipe main pipe section 25 and the water level monitoring equipment 3. The drainage pipe main pipe section 25 is arranged along with the cable drain pipe 1 and led to the cable well 6, and finally connected to the drainage pump 4 arranged in the cable well 6. The other side of the drainage pump 4 is connected to the external drainage pipe 5, and the external drainage pipe 5 is finally led to the drainage system outside the cable well 6.

[0028] The water level monitoring equipment 3 includes a pressure gauge water level gauge 31, a water level gauge power line 32 and a water level gauge delivery pipeline 33. The pressure gauge water level gauge 31 is arranged at the bottom of the stainless steel plate leakage collection well 26 to monitor the leakage water level and control the opening and closing of the drainage pump 4. The water level gauge power line 32 and the water level gauge delivery pipeline 33 are arranged with the cable drain pipe 1 and led to the cable well 6.

[0029] The cable well 6 includes a cable well reinforced concrete structure 61, a cable well cover 62, a cable well sump 63 and a maintenance ladder 64; the cable well cover 62 is located at the top of the cable well reinforced concrete structure 61 and serves as a maintenance manhole cover. The maintenance ladder 64 is used by maintenance personnel to enter and exit the cable well 6. The cable well sump 63 is located at the bottom of the cable well 6 and is used to collect leaked water in the cable well 6.

[0030] The gap between the cable tube 11 and the cable 15 at the end of the cable tube 1 in the cable well 6 should be sealed with a caulking structure 16 to prevent fire, water and small animals. At the same time, a vent pipe 17 is buried in the caulking structure 16 to ensure the balance of air pressure inside and outside the cable tube 11 when draining the water leakage in the stainless steel plate leakage water collection well 26.

[0031] The pressure gauge water level gauge 31 and the water level gauge power line 32 are transported to the bottom of the stainless steel plate leakage collection well 26 along the water level gauge delivery pipeline 33 by gravity. When inspecting and replacing, the pressure gauge water level gauge 31 can be extracted by pulling the water level gauge power line 32 along the water level gauge delivery pipeline 33.

[0032] The elevation of the end of the cable pipe 11 in the cable well 6 is higher than the water surface line 9 of the river channel to prevent external water from seeping into the cable well 6 and then seeping into the cable pipe 11 through the end of the cable pipe 11.

[0033] A power line for the drainage pump 4 is arranged in the cable well 6 so as to supply power to the drainage pump 4 .

[0034] The water level meter power line 32 extends to the outside of the cable well 6 and is connected to the power distribution cabinet.

[0035] A cable support and a cable pipe 11 away from the river channel are arranged in the cable well 6 so that the cables can be led out of the cable well 6 .

[0036] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. An underwater cable pipe laying structure, characterized in that: It utilizes the dry land created by the cofferdam for open-cut pipe construction, including cable drainage pipes, leakage drainage equipment, water level monitoring equipment, drainage pumps, external drainage pipes and cable wells; the cable drainage pipes are laid along the riverbed ground line and extend to both banks, pass through the revetment retaining wall and extend into the cable well; the lowest point of the cable drainage pipes is connected with the leakage drainage equipment; the cable drainage pipes include cable pipes, outer reinforced concrete, lower plain concrete cushion layer, reducing tees, cables, caulking structure and ventilation pipes; the leakage drainage equipment includes a straight section of drainage pipes, drainage pipe elbows, drainage pipe tees, drainage pipe crosses, drainage pipe main section and a stainless steel plate leakage collection well; a reducing tee is arranged at the lowest point of the cable drainage pipes, and the straight section of drainage pipes, drainage pipe elbows, drainage pipe tees and drainage pipe crosses are connected at the reducing tees, After being collected at one place, it is connected to the stainless steel plate leakage collection well, and the bottom of the stainless steel plate leakage collection well is connected to the main drainage pipe section and the water level monitoring equipment; the main drainage pipe section is led into the cable well along with the cable drainage pipe arrangement, and finally connected to the drainage pump arranged in the cable well, and the other side of the drainage pump is connected to the external drainage pipe, and the external drainage pipe is finally led to the drainage system outside the cable well; the gap between the cable pipe and the cable at the end of the cable drainage pipe in the cable well is sealed by the caulking structure, and the ventilation pipe is buried in the caulking structure at the same time, so as to ensure the balance of air pressure inside and outside the cable pipe when the leakage water in the stainless steel plate leakage collection well is pumped out; the elevation of the end of the cable pipe in the cable well is higher than the water surface line of the river channel, so as to prevent external water from seeping into the cable well and then seeping into the cable pipe through the cable pipe port.

2. The underwater cable pipe laying structure according to claim 1 is characterized in that: The water level monitoring equipment includes a pressure gauge water level gauge, a water level gauge power cord and a water level gauge delivery pipeline. The pressure gauge water level gauge is arranged at the bottom of the stainless steel plate leakage collection well to monitor the leakage water level to control the opening and closing of the drainage pump. The water level gauge power cord and the water level gauge delivery pipeline are arranged with the cable drainage pipe and led into the cable well.

3. The underwater cable pipe laying structure according to claim 1 is characterized in that: The cable well includes a cable well reinforced concrete structure, a cable well cover, a cable well sump and a maintenance ladder; the cable well cover is located on the top of the cable well reinforced concrete structure and serves as a maintenance manhole cover; the maintenance ladder is used for maintenance personnel to enter and exit the cable well; the cable well sump is located at the bottom of the cable well and is used to collect leaked water in the cable well.

4. The underwater cable pipe laying structure according to claim 1 is characterized in that: A drainage pump power line is arranged in the cable well to supply power to the drainage pump.

5. The underwater cable pipe laying structure according to claim 1 is characterized in that: A cable support and a cable pipe away from the river channel are arranged in the cable well so that the cable can be led out of the cable well.

6. The underwater cable pipe laying structure according to claim 2, characterized in that: The water level meter power line extends outside the cable well and is connected to the power distribution cabinet.

7. The underwater cable pipe laying structure according to claim 2 is characterized in that: The pressure gauge type water level gauge and the water level gauge power cord are transported to the bottom of the stainless steel plate leakage collection well along the water level gauge delivery pipeline by gravity. During maintenance and replacement, the pressure gauge type water level gauge is extracted through the water level gauge power cord along the water level gauge delivery pipeline.

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