CN215053675U

CN215053675U - Cable trench crossing structure

Info

Publication number: CN215053675U
Application number: CN202120489803.3U
Authority: CN
Inventors: 王海明; 何世洋; 赵栋; 朱殿之; 程明; 孙先磊; 董昶宏; 董浩森; 金永贵; 马宏渊
Original assignee: China Energy Engineering Group Gansu Electric Power Design Institute Co ltd
Current assignee: China Energy Engineering Group Gansu Electric Power Design Institute Co ltd
Priority date: 2020-11-27
Filing date: 2021-03-08
Publication date: 2021-12-07
Anticipated expiration: 2031-03-08

Abstract

A cable trench crossing structure is characterized in that a water collecting pit and a newly-built cable trench are sequentially built on two sides of an original cable trench, and the bottom of the newly-built cable trench is higher than the bottom of the water collecting pit; the water collecting pits on two sides of the original cable trench are communicated through the drain pipe arranged below the original cable trench, and the cable penetrates through the buried pipe arranged between the bottom of the original cable trench and the drain pipe. The utility model discloses structure safe and reliable, low in cost can effectively solve cross cable pit drainage problem, has practiced thrift the cost again in the reduction of erection time, can effectively improve the reliability of power supply, reduces later stage operation risk, has important economic benefits and social.

Description

Cable trench crossing structure

Technical Field

The utility model relates to a cable pit field especially relates to a cable pit cross structure.

Background

The importance of cable ducts as an indispensable infrastructure in substations is self evident. The phenomenon that a newly-built cable trench is crossed with an original cable trench often appears when reconstruction and extension are carried out in an existing transformer substation, and under the condition, two methods are generally adopted, wherein one method is to dismantle part of the cable trench at the crossed part and pour the newly-built cable trench into a whole, and the other method is to penetrate through the bottom of the original cable trench, but the two methods have serious defects. Because the transformer substations are all in live-line operation, the protection of cables in the existing cable trench needs to be considered when the first method is used for dismantling, the cost is high, and when more cables exist in the original cable trench, the dismantling of the original cable trench has great potential safety hazards, so that the scheme is not feasible in principle; the second method can have a recessed region in the cable trench bottom, and rainwater in the cable trench can not be discharged, so that the cable is in a water soaking environment for a long time, the service life of the cable is reduced, the operation risk of a transformer substation is increased, when the rainwater in the cable trench is large, manual pumping is needed, and the operation and maintenance cost is high. Therefore, a new cable trench crossing structure is needed to ensure the safety of the cable in the original cable trench and solve the problem of drainage in the cable trench.

SUMMERY OF THE UTILITY MODEL

The utility model provides a simple structure, construction convenience, low in cost's novel cable pit cross structure.

The utility model adopts the technical proposal that:

a cable trench crossing structure is characterized in that a water collecting pit and a newly-built cable trench are sequentially built on two sides of an original cable trench, and the bottom of the newly-built cable trench is higher than the bottom of the water collecting pit; the water collecting pits on two sides of the original cable trench are communicated through the drain pipe arranged below the original cable trench, and the cable penetrates through the buried pipe arranged between the bottom of the original cable trench and the drain pipe.

And the drainage gradient i of the newly-built cable trench and the drainage pipe is more than or equal to 3 percent.

The distance between the edge of the water collecting pit and the outer side of the original cable trench is more than or equal to 500 mm.

The drain pipe is 150-300 mm higher than the bottom of the sump.

The utility model has the advantages that: the structure is simple in construction, the original cable trench is not required to be dismantled, the construction risk is low, and the manufacturing cost is low; secondly, the structure can effectively solve the problem of water accumulation in the cable trench, reduce the operation risk and the later operation and maintenance cost, and is once and for all; the drainage of the structure does not need external forces such as a water pump, rainwater in the cable trench can be drained into a designated drainage place only by self-flowing drainage, and the structure is green and environment-friendly.

To sum up, the utility model discloses structure safe and reliable, low in cost has practiced thrift the cost again in the reduction of erection time, can effectively improve the power supply reliability, reduces later stage operation risk, has important economic benefits and social.

Drawings

Fig. 1 is a schematic plan view of the present invention;

fig. 2 is a schematic sectional view of the present invention.

In the figure: 1-original cable trench, 2-original cable trench cover plate, 3-original cable trench cushion layer, 4-original live cable, 5-newly-built cable trench, 6-newly-built cable trench cover plate, 7-sump pit, 8-newly-built cable trench cushion layer, 9-drain pipe, 10-cable, 11-galvanized steel pipe, 12-undisturbed soil.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, a cable trench crossing structure comprises an original cable trench 1, wherein a sump 7 and a newly-built cable trench 5 are sequentially built on two sides of the original cable trench 1, and the bottom of the newly-built cable trench 5 is higher than the bottom of the sump 7; the water collecting pits 7 on both sides of the original cable trench 1 are communicated through a drain pipe 9 arranged below the original cable trench 1, and a cable 10 passes through a buried pipe 11 laid between the bottom of the original cable trench 1 and the drain pipe 9.

The drainage slope i of the newly-built cable trench 5 and the drainage pipe 9 is larger than or equal to 3%, and due to the fact that the newly-built cable trench has slopes, a height difference exists at the end portions of the newly-built cable trench on two sides of the original cable trench, and therefore rainwater in the cable trench can be smoothly drained to the other end from one end through the reinforced concrete drainage pipe.

The distance between the edge of the water collecting pit 7 and the outer side of the original cable trench 1 is more than or equal to 500mm, so that the stability of the original cable trench is ensured; the depth is 800-1000 mm.

The drain pipe 9 is higher than the bottom of the water collecting pit 7 by 150-300 mm so as to prevent rainwater in the cable trench from recharging, the diameter of the drain pipe 9 is determined according to the size of the newly-built cable trench and the rainwater amount, and generally the diameter is preferably 300-500 mm.

The drain pipe 9 is made of reinforced concrete. The drain pipe made of reinforced concrete has good quality and low manufacturing cost; then, the production process of the reinforced concrete drain pipe is simple, and the manufacturing speed is high; thirdly, the reinforced concrete drain pipe has high hardness, can bear strong water pressure and has high safety coefficient; fourthly, the reinforced concrete drain pipe has reasonable structure, can be well combined and connected together, ensures the whole tightness and avoids the leakage problem; fifthly, the inner wall of the reinforced concrete drain pipe is very smooth, so that the smoothness of the system is ensured, and the reinforced concrete drain pipe is not easy to accumulate and block impurities; finally, the reinforced concrete drain pipe is very firm, and is made of the most stable and shock-resistant materials in use.

The distance between the top of the buried pipe 11 and the bottom of the original cable trench cushion layer 3 is larger than or equal to 300mm, and the cable trench is prevented from settling.

The buried pipe 11 adopts a galvanized steel pipe, and the galvanized steel pipe can protect the cable and facilitate the replacement and maintenance of the cable.

During construction, newly-built cable ditches 5 and water collecting pits 7 on two sides of an original cable ditch 1 are excavated according to the size and the elevation, attention is paid to the fact that undisturbed soil 12 cannot be disturbed during excavation, the safety of the original cable ditch 1 is ensured, corresponding protection measures are taken if necessary, and the distance between the edge of the water collecting pit 7 and the outer side of the original cable ditch 1 is preferably larger than or equal to 500 mm. When the foundation elevations of the newly-built cable trench 5 and the water collecting pit 7 are dug, a newly-built cable trench cushion layer 8 is poured, the thickness is 100mm, the periphery of the newly-built cable trench 5 is over wide, the bottom of the water collecting pit 7 is 100mm, and then according to the construction of the reinforced concrete drain pipe 9 and the galvanized steel pipe 11 with corresponding sizes, the construction method adopts a pipe jacking method for construction. And then constructing a newly-built cable trench 5 and a water collecting pit 7 according to the sequence of formwork erecting, reinforcing bars and concrete pouring, laying a cable 10 when the strength of the concrete structure of the newly-built cable trench 5 and the water collecting pit 7 meets the design requirement, and finally covering a newly-built cable trench cover plate 6, wherein the height of the newly-built cable trench cover plate 6 is preferably consistent with that of the original cable trench cover plate 2, and the original live cable 4 which is running exists in the original cable trench 1.

Claims

1. A cable trench crossing structure, its characterized in that: sequentially building a water collecting pit (7) and a newly-built cable trench (5) on two sides of an original cable trench (1), wherein the bottom of the newly-built cable trench (5) is higher than the bottom of the water collecting pit (7); the water collecting pits (7) on two sides of the original cable trench (1) are communicated through a drain pipe (9) arranged below the original cable trench (1), and the cable (10) penetrates through a buried pipe (11) laid between the bottom of the original cable trench (1) and the drain pipe (9).

2. The cable trench crossing structure of claim 1, wherein: the drainage gradient i of the newly-built cable trench (5) and the drainage pipe (9) is more than or equal to 3 percent.

3. The cable trench crossing structure of claim 1, wherein: the distance between the edge of the water collecting pit (7) and the outer side of the original cable trench (1) is more than or equal to 500 mm.

4. The cable trench crossing structure of claim 1, wherein: the drain pipe (9) is 150-300 mm higher than the bottom of the sump (7).

5. The cable trench crossing structure of claim 1, wherein: the drain pipe (9) is made of reinforced concrete.

6. The cable trench crossing structure of claim 1, wherein: the distance between the top of the buried pipe (11) and the bottom of the original cable trench cushion layer (3) is more than or equal to 300 mm.

7. The cable trench crossing structure of claim 6, wherein: the buried pipe (11) is a galvanized steel pipe.