JPH036723B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for expanding a power cable conduit buried underground.

[Prior Art] Conventionally, power cable conduits have been installed using general roads, and moreover, in urban areas, they are buried mainly on roads with frequent traffic. When expanding the number of facilities due to an increase in power demand, traffic is restricted or blocked, and the construction work is divided into sections to complete the work in a short period of time. However, in the conventional construction method, as shown in Fig. 2, the width W1 of the existing pipe 1 having a rectangular cross section,
The road surface R is excavated to a depth that the entire existing pipeline 1 is exposed, taking into account the width W2 of the expansion pipeline 11 and the working spaces W3, W3' for driving sheet piles, etc., and the working spaces W3, W3' are excavated. With soil piling done by driving sheet piles etc. on both sides of W3', extension pipes 8, 8, 8 are placed adjacent to the exposed existing pipe 1, and then these existing pipes 1 and By arranging a large number of reinforcing bars 13 so as to completely surround each extension pipe 8, and placing a concrete covering layer 14 so as to surround all of these existing pipes 1, each extension pipe 8, and reinforcing bars 13. He is trying to form the extension pipe line 11.

In this conventional construction method, for example, the space between manholes installed on the road surface is used as a unit, and furthermore, this space is divided as appropriate, as shown in Figure 2 (W1+
Since it is necessary to excavate with a cross section of W2 + W3 + W3') x D, a large amount of earth and sand is ejected, prolonging the construction period. Not only did it require related work, but it also posed a social problem by preventing heavy traffic from using the road for a long period of time.

[Object of the Invention] The present invention solves these conventional problems, minimizes the excavation area, and further eliminates the need for arranging reinforcing bars to bury the pipes and placing a concrete covering layer. The purpose of this project is to propose a construction method that can shorten the construction period, significantly reduce the area occupied by the road, and minimize traffic disturbances.

[Structure of the Invention] A space in which a conduit is to be expanded in contact with one side of an existing conduit buried underground, a side wall of the existing conduit facing the expansion space is exposed, and a top surface connected to the side wall is provided. After excavating to expose a part of the expansion space and installing earthen pilings on the outer surface of the expansion space and cleaning the entire side wall of the existing pipeline facing the expansion space, reinforcing bars were installed on the bottom of the expansion space. An extension pipe is placed above the pipe, an adhesive is applied to the entire surface of the cleaned side wall, and immediately after that, concrete is poured into the extension space to form an extension pipe.

[Operation] The side wall of the existing pipe is cleaned and an adhesive is applied to the entire surface thereof, and immediately after that, concrete is poured to form the extension pipe, thereby adhesively fixing the extension pipe to the existing pipe. This eliminates the need to embed existing pipes and additional pipes with a concrete covering layer as in conventional processes. On the other hand, since it is not necessary to bury the existing pipes and the additional pipes with a concrete covering layer, the amount of underground excavation and backfilling can be significantly reduced, and the construction period can be shortened.

[Example] In Fig. 1, reference numeral 1 indicates an existing pipe line in which six pipes 2, through which power cables are inserted, are fixed with concrete 3, which are buried at a required depth in the road surface R. The concrete 3 is solidified to have a rectangular cross section, and a foundation 4 is poured into the lower surface of the solidified concrete. In this way, the existing pipe 1 buried in the ground E under the road surface R is connected to one side wall 5 of the concrete 3.
Excavating is done so that a part of the top surface 6 connected to the side wall 5 (approximately 1/2 of the width D1 of the top surface 6 in FIG.
The total width of the width W2 and the work space W3 is excavated. Then, the work space W3 is paved with earth, the entire surface of the side wall 5 of the existing pipe line 1 is cleaned with high-pressure washing water, and the expanded pipe line 11 is cleaned.
Reinforcing bars 7 are arranged on the bottom surface where the reinforcing bars 7 are provided, and extension pipes 8, 8, 8 are arranged above the reinforcing bars 7 through which the power cables are inserted. On the other hand, epoxy resin adhesive 9 is applied to the entire surface of the side wall 5 of the existing pipe line 1 that has been cleaned as described above, and immediately after that, concrete 10 is poured and reinforcing bars 7 and each extension pipe 8 are embedded in the extension pipe. Complete the conduit 11.

The extension pipe line 11 formed in this way has one side wall 12 integrally joined to the side wall 5 of the existing pipe line 1 with an epoxy resin adhesive 9, and is firmly connected to the side wall 12 as shown in FIG. As shown in the conventional construction method, the existing pipeline 1 and the additional pipeline 11 are reinforced with reinforcing bars 13.
Since there is no need to embed it in the concrete covering layer 14, the amount of reinforcing bars and concrete used can be significantly reduced, and the construction work can be reduced to shorten the construction period.

Furthermore, the construction method of the present invention can greatly reduce the amount of underground excavation, reduce all the work of transporting and backfilling the excavated earth, and minimize traffic restrictions on the exclusive area of the passage. It can be shortened or shortened.

[Effects of the Invention] As described above, the method for expanding underground conduits for power cables of the present invention involves cleaning and cleaning the side wall of the existing conduit, applying an adhesive to the side wall, and applying the adhesive to the side wall of the existing conduit. This method involves fixing the side walls of the expansion pipeline and joining the existing pipeline and expansion pipeline together, and unlike conventional construction methods, reinforcing bars are placed around the existing pipeline and expansion pipeline. , there is no need to provide a concrete covering layer, and since it is not necessary to provide such a concrete covering layer, there is less underground excavation, reducing the amount of construction work and materials used, and shortening the construction period. Additionally, there are many advantages, such as the fact that the area occupied by the road is reduced and traffic regulations can be significantly reduced.

[Brief explanation of the drawing]

The figures relate to the present invention; FIG. 1 is a sectional view, and FIG. 2 is a sectional view showing a conventional construction method. 1...Existing pipe, 5...Side wall, 6...Top surface, 7
...Reinforcing bar, 8...Extension pipe, 9...Adhesive, 10...
...Concrete, 11...Expansion pipe.

Claims (1)

[Claims] 1. Expose the space where a conduit is to be expanded in contact with one side of the existing conduit buried underground, as well as the side wall of the existing conduit that faces the expansion space, and further expose a part of the top surface that connects to the side wall. After excavating the area to expose it and applying earthen pilings to the outer surface of the expansion space and cleaning the entire side wall of the existing pipeline facing the expansion space, reinforcing bars were installed on the bottom of the expansion space. Underground installation for power cables, characterized in that an extension pipe is placed above the cleaned side wall, an adhesive is applied to the entire surface of the cleaned side wall, and immediately after that, concrete is poured in the extension space to form an extension pipe. Pipe extension construction method.