CN115313292A - Cable down-hole and method for laying cable in cable down-hole - Google Patents

Abstract

The invention is used in the field of hoistway construction, and particularly relates to a cable downhole and a method for laying cables in the cable downhole. The vertical shaft is located on one side of the horizontal well, and the connection between the vertical shaft and the horizontal well is provided with a manhole, and the manhole is higher than the height of the cable pipe. Since the manhole is set between the horizontal well and the vertical shaft, the height of the manhole is higher than the height of the cable pipe in the horizontal well, and the manhole can prevent the accumulation of water from entering the tunnel, thereby preventing the electrical equipment in the tunnel from being damp and damaged. The method of laying the cable in the cable downhole, the cable is passed from the cable pipe to the horizontal well; the cable is erected on the cable support arranged in a stepped ascending arrangement; the cable enters the vertical shaft through the manhole, and then passes through the tunnel roof The pipe holes on the tunnel enter the tunnel; after the cables are laid, the manholes and the pipe holes on the top plate of the tunnel are blocked to avoid moisture and damage to the electrical equipment in the tunnel.

Description

A cable downhole and a method for laying cables in a cable downwell

technical field

The invention is used in the field of shaft construction, and in particular relates to a cable-leading well and a method for laying cables in the cable-leading well.

Background technique

At present, cables enter the power tunnel by drilling holes on the outer wall of the power tunnel structure, laying cables into the tunnel, and covering the entry tunnel with soil. This method is very rough in construction, and there are many risks and hidden dangers. The cable pipe hole is easy to cause water leakage. The roof of the power tunnel working well structure is generally about 1.5 meters away from the municipal road surface, and some are even deeper. The depth of ordinary cable wells cannot meet the requirements for cables to enter from the side wall of the power tunnel structure. It is very easy to leak water after aging and the cable body, resulting in damp and damage to the electrical equipment in the tunnel.

Contents of the invention

In order to solve at least one of the above technical problems, the present invention provides a cable downhole and a method for laying cables in a cable downhole, and the adopted technical solutions are as follows.

A cable-guided downhole, comprising

A horizontal well, the side of the horizontal well is provided with a cable pipe, and the inside of the horizontal well is provided with a cable support;

A vertical shaft, the vertical shaft is arranged on one side of the horizontal shaft, and a manhole is provided at the connection between the vertical shaft and the horizontal shaft, and the manhole is higher than the height of the cable conduit.

The cable guide shaft of the embodiment of the present invention has at least the following beneficial effects: since a manhole is set between the horizontal shaft and the vertical shaft, the height of the manhole is higher than the height of the cable pipes in the horizontal shaft, and the manhole is higher, which can effectively prevent accumulation in the horizontal shaft. Water enters the interior of the tunnel from the shaft through the manhole, thereby preventing the electrical equipment in the tunnel from being damp and damaged.

According to other embodiments of the cable guide shaft of the present invention, the bottom of the horizontal shaft is provided with a water collection port.

According to some other embodiments of the present invention, the wellhead of the horizontal well is provided with a well cover, and the well cover cooperates with the wellhead of the horizontal well.

According to some other embodiments of the present invention, there are multiple cable supports, and each cable support is arranged in a step-up manner along the direction of the cable conduit to the manhole.

According to some other embodiments of the present invention, the wellhead of the horizontal well is wrapped with angle steel.

According to other embodiments of the present invention, a ladder is provided inside the shaft.

According to other embodiments of the present invention, there are multiple cable conduits.

A method for laying a cable in a cable lead downhole, comprising the following steps:

The cable is passed through the cable pipe into the horizontal well;

Erect the cables on the cable supports arranged in a step-up manner;

The cable enters the shaft through the manhole, and then enters the tunnel through the pipe hole on the roof of the tunnel;

After the cables are laid, the manholes and the pipe holes on the roof of the tunnel are blocked.

The method for laying cables in a cable leading downhole in the embodiment of the present invention has at least the following beneficial effects: the cables erected in this way can effectively prevent accumulated water from entering the tunnel.

According to other embodiments of the method for laying a cable in a downhole with a cable, the manhole is sealed with bricks and plugging mortar.

According to other embodiments of the present invention, the method for laying cables in a cable lead downhole, the pipe holes on the tunnel roof where cables are passed through are sealed with leak-stopping adhesive, and the pipe holes on the tunnel roof where no cables are passed through are sealed with pipe plugs and plugs. Leakage cement to seal.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is a schematic diagram of the structure of a cable passing through a cable downhole according to an embodiment of the present invention;

Fig. 2 is the top view of the cable downhole in one embodiment of the present invention;

Fig. 3 is a sectional view along A-A in Fig. 2;

Fig. 4 is a B-B sectional view in Fig. 2;

Fig. 5 is a sectional view to C-C in Fig. 2;

Fig. 6 is a sectional view taken along line D-D in Fig. 2 .

Detailed ways

This part will describe the specific embodiment of the present invention in detail, and the preferred embodiment of the present invention is shown in the accompanying drawings. Each technical feature and overall technical solution of the invention should not be construed as limiting the protection scope of the present invention.

In the present invention, if there is a description of directions (up, down, left, right, front and back), it is only for the convenience of describing the technical solution of the present invention, rather than indicating or implying that the referred technical features must have specific Orientation, construction and operation in a particular orientation, therefore should not be construed as limiting the invention.

In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceeding", etc. are understood as excluding the original number; "above", "below", "within" " and so on are understood as including the original number. In the description of the present invention, if "first" and "second" are used only for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or Implicitly indicates the sequence of the indicated technical features.

In the present invention, words such as "setting", "installing" and "connecting" should be understood in a broad sense unless otherwise clearly defined. For example, they can be directly connected or indirectly connected through an intermediary; The detachable connection can also be integrally formed; it can be a mechanical connection, it can also be an electrical connection or can communicate with each other; it can be the internal communication of two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

With the construction of power grids in big cities and the improvement of people's living environment requirements, more and more high-voltage overhead lines have the need to "go underground", and more and more power tunnels appear in the central areas of big cities. The power tunnel structure of the open-cut section is generally at least 2 meters deep from the municipal road surface, and the power tunnel structure of the pipe jacking section is generally about 6 meters deep from the municipal road surface. A tunnel working well is set about 500 meters away. The working well is built on the second floor or third floor according to needs Layer structure, the bottom layer is connected to the power tunnel. Due to various factors such as urban aesthetic requirements and land acquisition difficulties, many tunnels set up a power distribution room on the first floor of the tunnel working shaft. Electrical equipment such as transformers, high-voltage switch cabinets, and low-voltage power distribution cabinets are installed in the power distribution room to provide ventilation for the tunnel. , lighting, etc. to provide power. The permanent power supply of the tunnel needs to be taken from the overhead line or switch room near the tunnel working well, and the cables need to enter the power distribution room of the power tunnel working well from the 10kV cable corridor on the road. At present, many construction units directly drill holes on the outer wall of the roof structure of the power tunnel working well to lay cables into the tunnel, and cover the place where they enter the tunnel with soil. There are hidden dangers of water leakage and the shortcomings of excavation required for cable repairs. Water leakage on the roof of the working well of the tunnel will increase the power supply. The air humidity in the room creates a great potential safety hazard. If the leaking water drops directly on the electrical equipment, it may cause a more serious power outage. Therefore, preventing water leakage from the roof of the working shaft of the tunnel is very important for the stable and safe operation of the electrical equipment in the power distribution room of the working shaft.

At present, cables enter the power tunnel by drilling holes on the outer wall of the power tunnel structure, laying cables into the tunnel, and covering the place where the tunnel enters. This method is very rough in construction and has the following risks and hidden dangers:

1. It is inconvenient to repair. When the cable is damaged and it is necessary to lay a new cable into the tunnel for emergency repair, it is necessary to re-excavate the covering soil where the original cable enters the tunnel.

2. The cable pipe hole is easy to cause water leakage. The roof of the power tunnel working well structure is generally about 1.5 meters away from the municipal road surface, and some are even deeper. The depth of ordinary cable wells cannot meet the requirements for cables to enter from the side wall of the power tunnel structure. It is very easy to leak water, which will cause moisture and damage to the electrical equipment in the tunnel.

3. The surface of the cable is easy to cause water leakage. After the insulation rubber on the surface of the cable is damaged, the accumulated water on the road will easily enter the tunnel along the insulation rubber on the cable surface, causing the electrical equipment in the tunnel to be damp and damaged.

In order to solve the above technical problems, the present invention provides a cable-guided downhole.

Referring to Fig. 1 to Fig. 6, the cable downhole includes a horizontal shaft 100 and a vertical shaft 200, the side of the horizontal shaft 100 is provided with a cable pipe 101, the interior of the horizontal shaft 100 is provided with a cable support 102, the vertical shaft 200 is arranged on one side of the horizontal shaft 100, and the vertical shaft 200 A manhole 201 is provided at the junction with the horizontal well 100 , and the manhole 201 is higher than the height of the cable conduit 101 .

Since the manhole 201 is set between the horizontal shaft 100 and the shaft 200, the height of the manhole 201 is higher than the height of the cable pipe 101 in the horizontal shaft 100, and the manhole 201 can effectively prevent the accumulated water in the horizontal shaft 100 from crossing the manhole 201 and entering through the vertical shaft 200. The inside of the tunnel, thus avoiding the damp and damage of the electrical equipment in the tunnel.

The cable pipes 101 and the vertical shaft 200 are distributed on both sides of the horizontal shaft 100, wherein the cable pipes 101 are transversely fixed on the wall of the horizontal shaft 100 and extend outward.

In some embodiments, there are multiple cable conduits 101 , which is convenient for passing multiple cables 001 at the same time.

The main reinforcement of Hengjing 100 is Class II, and the stirrup is Class I. The cushion layer 106 of Hengjing 100 is made of vertical and horizontal steel mesh, and the concrete is made of C15. It is built with cement mortar, and the inner wall and exposed surface of Hengjing 100 are covered with 1:2 cement mortar.

The shaft 200 is built on the tunnel roof 300, and a row of pipe holes 301 for passing cables 001 is arranged on the tunnel roof 300.

In some embodiments, the bottom of the horizontal well 100 is provided with a water collecting port 103 through which the water entering the horizontal well 100 can be drained away.

Specifically, the water collecting port 103 of the PVC pipe is set in the horizontal well 100 , the PVC pipe is filled with coarse sand, and the vertical water collecting slope is not less than 0.5%, so as to prevent water accumulation in the horizontal well 100 .

In order to facilitate emergency repair when the cable 001 is damaged, in some embodiments, the wellhead of the horizontal well 100 is provided with a well cover 104 , and the well cover 104 cooperates with the wellhead of the horizontal well 100 .

Specifically, the manhole cover 104 adopts an anti-theft cement cover plate, and the elevation of the top surface of the manhole cover 104 should be consistent with the ground elevation. When laying a new cable 001 and entering the tunnel for emergency repair, no civil excavation is involved, just open the manhole cover 104, enter the horizontal well 100, smash the bricks and plugging mortar at the manhole 201, and lay a new cable 001 directly. The repair efficiency is improved, the power outage time is shortened, and the construction work volume and construction difficulty are reduced. At the same time, the existence of the cable downhole is convenient for the operator to maintain the cable 001.

In some embodiments, the wellhead of the horizontal well 100 is wrapped with angle steel 105 to improve the strength of the wellhead.

Further, the angle steel 105 is galvanized angle steel.

In some embodiments, a ladder 202 is provided inside the shaft 200 .

Specifically, the ladders 202 are made of round iron and are arranged sequentially along the height direction of the shaft 200 to facilitate construction personnel to reach the bottom of the shaft 200 .

In some embodiments, there are multiple cable supports 102 , and each cable support 102 is arranged in a step-up manner along the direction from the cable duct 101 to the manhole 201 .

After the cable 001 is erected on the cable support 102, the cable 001 is in a tilted state. When the cable 001 ages, the accumulated water on the cable 001 cannot enter the tunnel through the cable 001 skin.

In some embodiments, the cable 001 is bound on the cable bracket 102 to ensure that the cable 001 is firmly installed on the cable bracket 102 .

The shaft 200 is built on the roof 300 of the tunnel, and a row of pipe holes 301 are drilled at the bottom of the shaft 200 .

After the cable 001 is placed, the manhole 201 is sealed with bricks and plugging mortar. The pipe hole 301 where the cable is passed on the tunnel roof 300 is sealed with the plugging mortar. There is no cable on the tunnel roof 300. Pipe hole 301 is sealed with pipe plug and plugging cement.

The side wall and top of the shaft 200 are integrally poured with steel mesh and concrete. The concrete is C20. The inner wall and exposed surface of the shaft 200 are coated with 1:2 cement mortar. The height of the shaft 200 is consistent with the ground level. The height of the shaft 200 is It can be adjusted according to the actual situation on site.

The present invention also provides a method for laying cables in a cable-guided well, comprising the following steps:

The cable 001 is passed through the cable pipe 101 into the horizontal well 100;

Erecting the cable 001 on the cable support 102 arranged in a stepped manner;

The cable 001 enters the shaft 200 through the manhole 201, and then enters the tunnel through the pipe hole 301 on the tunnel roof 300;

After the cable 001 is laid, the manhole 201 and the pipe hole 301 on the tunnel roof 300 are blocked.

The cable 001 erected in this way can effectively prevent accumulated water from entering the tunnel.

In some embodiments, the manhole 201 is sealed with bricks and plugging mortar.

In some embodiments, the pipe holes 301 on the tunnel roof 300 through which cables are passed are sealed with plugging mortar, and the pipe holes 301 on the tunnel roof 300 where no cables are passed through are blocked with pipe plugs and plugging mortar.

The leakage plugging putty not only has waterproof effect, but also the plugging putty at the manhole 201 and the pipe hole 301 has fireproof performance, which can block the spread of the fire when a fire breaks out and avoid further expansion of the fire.

Of course, the present application is not limited to the above-mentioned embodiments. Those skilled in the art can also make equivalent modifications or replacements without departing from the spirit of the present invention. These equivalent modifications or replacements are all included in the claims of the application. In the range.

Claims (10)

1. A cable-guided downhole, characterized in that: comprising A horizontal well, the side of the horizontal well is provided with a cable pipe, and the inside of the horizontal well is provided with a cable support; A vertical shaft, the vertical shaft is arranged on one side of the horizontal shaft, and a manhole is provided at the connection between the vertical shaft and the horizontal shaft, and the manhole is higher than the height of the cable conduit. 2. The cable guide shaft according to claim 1, characterized in that: the bottom of the horizontal shaft is provided with a water collection port. 3. The cable-guided downhole according to claim 1, characterized in that: the wellhead of the horizontal well is provided with a well cover, and the well cover cooperates with the wellhead of the horizontal well. 4. The cable guide shaft according to claim 1, characterized in that: there are multiple cable supports, and each cable support rises stepwise along the direction of the cable pipes to the manhole. arranged. 5. The cable-guided downhole according to claim 1, characterized in that: the wellhead of the horizontal well is wrapped with angle steel. 6. The cable lead shaft according to claim 1, characterized in that: a ladder is provided inside the shaft. 7. The cable-guided downhole according to claim 1, characterized in that there are multiple cable conduits. 8. A method for laying a cable in a cable lead downhole, characterized in that it comprises the following steps: The cable is passed through the cable pipe into the horizontal well; Erect the cables on the cable supports arranged in a step-up manner; The cable enters the shaft through the manhole, and then enters the tunnel through the pipe hole on the roof of the tunnel; After the cables are laid, the manholes and the pipe holes on the roof of the tunnel are blocked. 9. The method for laying cables in a cable-guided well according to claim 8, characterized in that: the manhole is sealed with bricks and plugging mortar. 10. The method for laying cables in a cable-guided well according to claim 8, characterized in that: the pipe holes on the tunnel roof where the cables are passed are sealed with plugging cement, and the pipe holes on the tunnel roof that are not passed through the cables are sealed with Pipe plugs and plugging cement for sealing.

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