JP2001359211A - Pipe member for handhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe member for a handhole which has no risk of breaking duct sleeve, at conduit-line excavating work, transporting, etc. SOLUTION: The member is composed of pipe joint attaching short pipes 4, which have bellmouth portions 41 and pipe joint attaching portions 42 and are buried at prescribed spots of the peripheral wall 21 of a handhole body 2, and pipe joints to be attached to the attaching portions 42 of the short pipes 4. The length of each short pipe 4 is set to a length, at which its both ends 411, 421 such that they do not project out of the peripheral wall 21 of the handhole body 2, when it is fitted to the peripheral wall 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe member mounted on a handhole for arranging cables such as a power cable and a communication cable underground.

[0002]

2. Description of the Related Art Cables such as electric power cables and communication cables are covered with cable protection tubes and buried underground so as not to be affected by earth pressure or groundwater. When buried underground, hand holes (1P) as shown in Fig. 6 are mainly used at important locations underground.
Is installed, and then the handholes (1P) are cut open, the handholes (1P) are connected to each other with a cable protection tube (7P), and the protection tube (7P) is buried.

[0003]

However, in the conventional handhole (1P) described above, the duct sleeve (4P)
Since the part other than the root end (44P) of the pipe protrudes from the peripheral wall (21P) of the main body (2P) of the handhole (1P), heavy pipes etc.
5P) is easily damaged. Even if only one duct sleeve (4P) of the plurality of duct sleeves (4P) is damaged, since the plurality of duct sleeves (4P) are close to each other, the damaged duct sleeve (4P) ) Can not be replaced, and the damaged duct sleeve (4P) is fixed to the peripheral wall (21P) of the handhole (1P) body (2P)
The whole needs to be replaced.

[0004] Also, when transporting, a handhole
The duct sleeve projection (45P) projecting from the peripheral wall (21P) of the main body (2P) of (1P) reduces the loading efficiency, and furthermore, the duct sleeve projection (45P) is highly likely to be damaged.

[0005] Accordingly, an object of the present invention is to provide a pipe member for a handhole which is free from a possibility that the duct sleeve will be damaged at the time of pipeline cutting work or transportation.

[0006]

According to the present invention, there is provided a bell mouth portion (41) and a pipe joint insertion portion (42) for solving the above-mentioned problems.
A short pipe (4) for fitting a pipe fitting, which is buried at a predetermined location on the peripheral wall (21) of the handhole (1) body (2), and a pipe fitting insertion part (42) of the short pipe (4) Fittings (6a, 6b) which are inserted into the handhole.
(1) When mounted on the peripheral wall (21) of the body (2), both ends
(411, 421) is provided with a handhole tube member having a length set so as not to protrude from the peripheral wall (21).

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. A handhole according to one embodiment of the present invention is shown in FIG. The handhole (1) shown in FIG. 1 includes a box-shaped main body (2) and a lid member for closing an upper end opening of the main body (2).
(3), and a pair of opposed peripheral walls of the main body (2).
In (21), a plurality of pipes (here, three columns and three rows) for mounting pipe joints (4) are embedded.

[0008] As shown in FIG.
(4) is a bell mouth portion formed in a bell mouth shape (41)
And a pipe joint insertion portion (42) expanded in diameter through the step (43). The end surface (411) of the bell mouth portion (41) does not protrude from the inner peripheral surface (211) of the peripheral wall (21) of the handhole (1) main body (2), so that the pipe joint insertion portion (42) does not protrude. The end face (421) is located slightly deeper than the outer peripheral surface (212) of the peripheral wall (21) of the handhole (1) body (2). As described above, both ends (411, 421) of the pipe joint mounting short pipe (4) are connected to the peripheral wall (2) of the handhole (1) body (2).
It is embedded in the peripheral wall (21) so as not to protrude from 1).

In the handhole (1) according to the present embodiment,
At the opening of the fitting part (42) in the short pipe (4) for fitting fitting,
A lid (5) for closing the opening is detachably attached. As shown in FIGS. 2 and 3, in the lid (5), a flange (52) is formed at the end of the body (51), and a rubber ring mounting groove is provided in the middle of the body (51). A rubber ring (54) is mounted in the rubber ring mounting groove (53). A handle (55) is provided at the center of the outer surface of the lid (5).

[0010] The lid (5) is used to insert a pipe joint into the short pipe (4).
(42), and the flange portion (52) is attached to the insertion portion (4).
With the outer surface of the lid (5) in contact with the end surface (421) of the handhole (2), the outer peripheral surface (21) of the peripheral wall (21) of the handhole (1) body (2)
2) Do not protrude from.

When transporting the above-described handhole (1), the handhole (1) has a pipe fitting mounting short pipe (4) embedded in the main body (2) peripheral wall (21) and a duct sleeve. Since it does not protrude from the peripheral wall (21) of the main body (2), the loading efficiency is high and there is no risk of damaging the short pipe (4). When the handhole (1) is stored, it can be stored compactly for the same reason.

In the first stage of the cable burying work, such a handhole (1) is installed at a plurality of required places under the ground with the surface of the cover member (3) being substantially at the same level as the ground. When the handhole (1) is installed in the ground in this way, a lid () is provided at the opening of the pipe fitting insertion portion (42) of the short pipe (4) for fitting the pipe of the handhole (1). 5) is attached, and the opening of the insertion portion (42) is sealed via a rubber ring (54) mounted on the lid (5), so that the handhole (1)
It is possible to prevent stones, soil, mud, and the like from entering the inside of the inside, and prevent water from entering.

Next, in the second stage of the cable burying work, the pipeline between the handholes (1) installed as described above is cut by heavy equipment or the like. At this time, since the short pipe (4) for mounting the pipe joint does not protrude from the peripheral wall (21) of the main body (2) of the handhole (1), the short pipe (4) is not damaged by the heavy equipment or the like.

When the above-mentioned pipe excavation work is completed, the pipe fitting insertion portion (4) of each pipe fitting mounting short pipe (4) of the hand hole (1) is completed.
Remove the lid (5) closing the opening of (2), and
As shown in the figure, the pipe joint (6a) is inserted into the upper and lower short pipes (4) insertion section (42), and the pipe coupling (6b) is inserted into the middle short pipe (4) insertion section (42). I do.

[0015] The pipe joints (6a, 6b) are provided with insertion ports (62a, 62b).
And the receiving portions (64a, 6b) whose diameter is increased through the step portions (63a, 63b).
4b), a rubber ring mounting groove (65a, 65b) is provided around the opening near the opening of the receiving portion (64a, 64b), and the rubber ring mounting groove (65a, 65b) is provided. Are equipped with rubber rings (66a, 66b).

[0016] Insertion portions (62a, 62b) of the pipe joints (6a, 6b).
Is inserted into the short pipe (4) insertion part (42) until the edge of the insertion part (62a, 62b) comes into contact with the step part (43) of the short pipe (4) for fitting a pipe joint, preferably. Are bonded in that state.

In the present embodiment, the lengths of the receiving portions (64a, 64b) of the pipe joints (6a, 6b) are set to be the same, but the insertion portion (62a) is longer than the insertion portion (62b). Is also set long.
Therefore, the pipe joint (6a) is long and the pipe joint (6b) is short. As a result, as shown in FIG.
The opening of (64b) is located at the back.

After the pipe joints (6a, 6b) have been inserted into the insertion section (42) of the short pipe (4) for mounting a pipe joint as described above, FIG.
As shown in (5), a cable protection pipe (7) is connected to the receiving portions (64a, 64b) of the pipe joints (6a, 6b). The pipe joint (6
a, 6b), the step (63a, 63b) and the rubber ring (66a, 66b)
Cable protection tube (7)
The protection pipe (7) is connected to the pipe joints (6a, 6b) so that the tip of the pipe is located substantially at the center of the receiving portion (64a, 64b) of the pipe joints (6a, 6b). Even when compressive stress or tensile stress is generated between the protective tube (7) and the handhole (1) (short tube (4)) due to the above, the protective tube (7) is connected to the pipe joint (6a, 6b). )
The stress can be absorbed by sliding inside the receiving portions (64a, 64b) of the handhole (1) (short pipe (4)) and the pipe joint (6a,
6b) and the protection tube (7) are prevented from being damaged.

In this embodiment, as described above, since the opening at the receiving portion (64b) of the pipe joint (6b) is located at the back, a plurality of cable protection pipes (7) are connected to the pipe joint (6). 6a, 6b)
When connecting the protection tubes (7), the tips of all the protection tubes (7) do not have to be simultaneously inserted into all the receptacles (64a, 64b). (64a), and then into the opening of the receptacle (64b), positioning can be performed easily.

Pipe joints (6a, 6b) of the cable protection tube (7)
When the connection to the pipe is completed, the cut-out pipe is returned to its original position, the pipe joints (6a, 6b) and the protection pipe (7) are buried, and cables are passed through the protection pipe (7).

The present invention has been described with reference to the drawings. However, the present invention is not limited to the embodiments shown in the drawings, and various modifications can be made without departing from the scope of the present invention.
For example, the insertion portion (42) of the pipe fitting mounting short pipe (4) may be slightly expanded and tapered, or the short pipe (4)
The step (43) may not be provided, and the lid (5) attached to the short pipe (4) may not be provided. Furthermore, the lengths of the insertion portions (62a, 62b) of the pipe joints (6a, 6b) may be the same, and the lengths of the reception portions (64a, 64b) of the pipe joints (6a, 6b) may be the same. May be set shorter.

[0022]

According to the present invention, there is no fear that the short pipe for fitting the pipe joint will be damaged at the time of pipeline excavation work or transportation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a handhole according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of a handhole in FIG.

FIG. 3 is a perspective view of a short pipe cover for fitting a pipe in the handhole of FIG. 1;

FIG. 4 is a cross-sectional view of a pipe connection structure in a handhole according to an embodiment of the present invention.

5 is a sectional view showing a state in which a cable protection tube is connected to a pipe joint in the pipe connection structure of FIG.

FIG. 6 is a cross-sectional view of a conventional handhole, cable protection tube, and cables.

[Explanation of symbols]

 1 Handhole 2 Main body 21 Perimeter wall 211 Inner peripheral surface 212 Outer peripheral surface 4 Short pipe for fitting fitting 41 Bell mouth part 411 Bell mouth end face 42 Fitting fitting part 421 Fitting fitting fitting end face 43 Step 6a, 6b pipe Fittings 62a, 62b Insertion 63a, 63b Step 64a, 64b Receptacle 65a, 65b Rubber ring mounting groove 66a, 66b Rubber ring 7 Cable protection tube

Claims (1)

[Claims] 1. A short pipe for mounting a pipe joint which has a bell mouth portion and a pipe fitting insertion section and is buried in a predetermined portion of a peripheral wall of a handhole body, and is inserted into the pipe fitting insertion section of the short pipe. And the length of the short pipe for mounting the pipe joint is set such that both ends thereof do not project from the peripheral wall when the pipe is mounted on the peripheral wall of the handhole body. And a pipe member for a handhole.