JPS6014568B2 - Method for embedding and fixing hard resin flexible tubes for conduit conduits into manhole side walls - Google Patents

Description

Detailed Description of the Invention The present invention not only protects electric wire cables from sand and water when laying them underground, but also protects electric wire cables from sand, water, etc.
A method of embedding and fixing the fabric of a hard resin flexible pipe, which is used to protect it from damage due to dynamic and static loads received from other heavy objects, into the side wall of a concrete manhole. A conduit opening member having a bellmouth-shaped barrier is connected to the end of a corrugated hard resin steerable pipe to form an insertion conduit, and the connected end is embedded in the side wall of a concrete manhole. Regarding the method of fixing.

The above-mentioned conduit opening member is designed to prevent the cable from touching the manhole side wall at the opening edge of the hole or the opening edge of the hole when the cable is drawn in after the conduit is constructed, or if the cable is bent after being drawn in. It is used to prevent injury from sliding on the end of the flexible pipe itself and to finish the appearance of the inner surface of the manhole. When embedding and fixing it in the side wall, a flexible tube is generally used as shown in Figure 4.
With the conduit opening member 02 connected in advance to the end of the flexible pipe 01, concrete is placed so that a part of the end of the flexible pipe 01 is placed within the thickness of the manhole side wall 03A together with the conduit opening member 02. The desired implantation and fixation was carried out by pouring the material, but when using such a conventional method, there were the following problems.

In other words, the unit length of the above-mentioned hard resin flexible tubes is quite large, and such long flexible tubes are generally rolled up in order to save space when storing and transporting them. It is often handled based on posture.

Therefore, the unwound flexible pipe at the installation site is prone to bending and deforming due to the curls, and therefore, if it is embedded and fixed in the manhole side wall as it is, the flexible pipe and the pipe opening member will be damaged. There are disadvantages in terms of construction, such as difficulty in determining the orientation, and
In the case of the conventional method, there was also the inconvenience that the concrete pouring work for configuring the manhole and the work of laying the flexible pipe could not be performed separately. In view of the above circumstances, an object of the present invention is to propose a method that can securely and easily fix and hold the removable pipe end and the conduit opening member in a predetermined orientation, and that can perform the work efficiently as a whole. has.

The method of embedding and fixing a hard resin flexible tube for constituting an electrical conduit in a manhole side wall according to the present invention is as follows: Embed this pipe mouth in the manhole side wall with the open periphery of the bellmouth-shaped entrance located flush or almost flush with the inner surface of the manhole side wall. It is characterized by being fixed. That is, by using a pipe mouth member whose length in the direction of the marquee line is larger than the wall thickness of the manhole side wall, the pipe mouth member is the only thing that needs to be inserted into the manhole side wall. As mentioned above, there is no need to embed and fix the end of the flexible pipe, which is easily deformed due to curling, into the manhole side wall, and as a result, the pipe opening member can be reliably and accurately oriented in a predetermined orientation. You can easily perform the implantation process with
Along with this, the original function of the pipe port member is reliably achieved,
Moreover, the inner surface of the manhole can be finished in a good condition.

Furthermore, by using the pipe opening member as described above, the work of laying the movable pipe itself and the work of pouring concrete for constructing the manhole can be completely separated and carried out separately.
Overall, there was no work left on hand, and efficient construction became possible. The embodiment of the method of the present invention will be described below in detail based on illustrative drawings. For example, as shown in the model of FIG. As a pipe opening member 2 having a bellmouth-shaped entrance part 2a to be connected to the end of a corrugated hard resin (e.g., polyethylene) connectable pipe 1 for constructing a conduit for underground electric cable K insertion. , the length L in the hammer line direction is sufficiently larger than the wall thickness t of the side wall 3A of the manhole 3, and this conduit opening member 2 is
As clearly shown in the figure, the exit periphery 2b of the bellmouth-shaped entrance 2a is in direct contact with the inner surface of the inner side formwork 4 of the four pairs of opposing formworks 4, roughly formed to form the manhole side wall 3A. 3, by pouring concrete between the pairs of formworks 4 and 4, the opening □ periphery 2b of the bellmouth-shaped entrance 2a is flush with the inner surface of the manhole side wall 3A. The front pipe outlet section 2 is inserted and fixed to the manhole side wall 3A in a state where it is located flush with or almost flush with the manhole.

Then, the corrugated straight guard portion 2c of the manhole side wall 3A protruding outwardly and the end of the steerable pipe 1 are connected via the corrugated straight pipe joint 5, so that a step is formed on the inner surface thereof. A conduit leading into the manhole 3 is laid by connecting it in a straight line so that it does not occur. Thereafter, the electric wire cable K is inserted using the pilot wire 1 and the lead-in wire. Incidentally, if the straight pipe joint 5 is constructed by cutting a plurality of pieces, the work of connecting the conduit opening member 2 and the flexible pipe 1 can be easily performed.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the method of embedding and fixing a hard resin flexible pipe for constituting electric wire conduit into the side wall of a manhole according to the present invention. FIG. 3 is an enlarged longitudinal sectional view of the main part after work, and FIG. 4 is an enlarged longitudinal sectional view illustrating the conventional method. 1...Hard resin mirror tube, 2...Pipe mouth village, 2a...Bellmouth-shaped opening, 3...Manhole, 3A...3 side wall. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A conduit opening member 2 having a bellmouth-shaped opening 2a is connected to the end of a corrugated hard resin flexible pipe 1 for constructing a conduit for underground electric wire insertion, and the connected end is covered with concrete. A method of embedding and fixing in a side wall 3A of a manufactured manhole 3, in which a pipe port member 2 whose axial length L is larger than the wall thickness t of the manhole side wall 3A is used. 2 through its bellmouth-shaped opening 2a.
A manhole of a hard resin flexible tube for constituting an electric wire conduit, characterized in that the manhole is embedded and fixed in the manhole side wall 3A with the opening periphery 2b thereof being flush with or almost flush with the inner surface of the manhole side wall 3A. Method of embedding and fixing into the side wall.