JP2001152471A - Wiring box embedded in underground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent water leakage in a joint of a joint member in a wiring box embedded in underground such as a handhole. SOLUTION: In a state that a joint member 10 in which a circular packing material 25 having elasticity such as a rubber packing is externally fitted onto a recessed groove 24 provided at the outer peripheral face of the base end opening 21 tubularly formed at both opened ends and fixedly stuck to a handhole 1 is inserted in a through hole 1A formed on the wall face of the handhole, the wiring box embedded in the underground is fixed in a state that the circular packing material 25 is coated with an adhesive S by the adhesive S filled in the joint between the through hole 1A and the outer peripheral face of the joint member 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground box for wiring such as a manhole or a handhole for connecting underground pipes for wiring weak wires, optical cables, information cables, communication lines and the like underground. More particularly, the present invention relates to an underground wiring box provided with a joint member for connecting the underground pipe to the embedding box.

[0002]

2. Description of the Related Art A joint member in an underground box for wiring as described above is formed in a tubular shape having both ends opened by a synthetic resin such as polyethylene, and one end of this joint member is made of concrete or the like. By inserting into a through hole provided on the side wall of an embedded box such as a hand hole or a manhole, and filling the gap between the through hole and the outer surface of the joint member with an adhesive such as an epoxy resin adhesive or mortar, When the buried box is buried in the ground, the buried box is fixed in a watertight state so that rainwater and groundwater do not enter the box from the joint between the through hole of the buried box and the outer surface of the joint member. in this case,
Even if the joint member made of synthetic resin such as polyethylene and the adhesive such as epoxy resin adhesive or mortar do not necessarily adhere completely, there is no problem in the water stopping property in a normal case.

However, when the embedding box is buried in the ground, the joint member may receive an unexpected impact, an adhesive such as an epoxy resin adhesive, or a synthetic resin joint member such as polyethylene. For example, when the material expands and contracts due to heat, a peeling phenomenon occurs between the adhesive at the joint portion and the joint member, and there is a possibility that water leaks from that portion.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a joint portion between a joint member and a through-hole of an embedding box at a joint portion of the joint member in the conventional underground box for wiring as described above. It is intended to prevent water leakage due to separation between the agent and the joint member.

[0005]

In order to achieve the above object, the underground wiring box according to the present invention is formed in a tubular shape with both ends opened and one end fixed to the underground wiring box. On the outer peripheral surface on the opening side, a joint member formed by externally fitting an annular packing material having elasticity,
With the one end opening side where the annular packing material is externally fitted inserted into a through hole provided in the wall surface of the embedding box, the adhesive filled in the joint between the through hole and the outer peripheral surface of the joint member is used to form the annular member. The packing material is fixed while being covered with an adhesive. Rubber packing can be used as the elastic packing material. Further, it is preferable that the annular packing material is externally fitted to a concave groove portion provided on an outer peripheral surface of the joint member.

According to the underground box for wiring according to the present invention as described above, if the box is buried in the ground, the shock may occur when the box is buried, or the joint member may shrink due to heat after the box is buried. Even if the adhesive filled in the joint between the through hole of the wall of the buried box and the outer surface of the joint member and the outer surface of the joint member are peeled off, the joint of the joint member is adhered to the outer peripheral surface of the joint member. An annular packing material having elasticity is externally fitted between the adhesive and the adhesive, and the elastic packing material is made of an adhesive at a joint portion such as an epoxy resin adhesive or mortar and a joint member made of a synthetic resin such as polyethylene. Since it is in close contact with any member, this annular packing material closes the gap between the adhesive at the joint and the joint member, thereby preventing water leakage.

[0007]

DETAILED DESCRIPTION OF THE INVENTION As the annular packing material having elasticity used in the present invention, a material generally called a rubber packing can be used. Examples of the material of the annular packing material include, but are not limited to, silicone rubber, NBR rubber, and the like. In consideration of the material of the joint member fixed by the adhesive, it is preferable to appropriately select and use a material having good adhesion to both of them.
In addition, as a packing material, while having water resistance,
It is preferable to select an epoxy resin, mortar, or the like that is filled in the joint portion, which does not deteriorate and lose elasticity during filling and curing. An annular packing material made of these elastic materials has elasticity, and an adhesive filled in joints such as an epoxy resin adhesive or mortar,
It tightly adheres to any member with a joint member made of synthetic resin such as polyethylene to prevent water leakage.

When the above annular packing material having elasticity is externally fitted to the outer peripheral surface of the joint member, the annular packing material having a diameter slightly smaller than the outer diameter of the joint member is used. It is preferable to provide it in a state where it is securely adhered to the outer peripheral surface of the member. Further, as described above, a plurality of annular packing materials can be externally fitted to the outer peripheral surface of the joint member. There are no particular restrictions on the thickness or cross-sectional shape of the annular packing material. For example, in the case of a normal handhole, the thickness of the annular packing material is about several mm, for example, 5 mm.
The cross-sectional shape of the annular packing material is not particularly limited as long as it is a shape that can easily adhere to the outer peripheral surface of the joint member. Further, if a concave groove is provided on the outer peripheral surface of the joint member, and the annular packing material is fitted to the concave groove portion,
At the same time, the position of the annular packing material can be prevented from being shifted, and the filled adhesive such as an epoxy resin-based adhesive or mortar and a joint member made of a synthetic resin such as polyethylene are combined with the annular packing in the groove portion. Adhering through the material prevents water leakage more reliably. In the case where the annular packing material is externally fitted to the concave groove portion, it is preferable that the cross-sectional shape of the annular packing material also be a shape that can easily adhere to the inner surface of the concave groove.

In the present invention, one end of the joint member fitted with the above-mentioned annular packing material is inserted into a through-hole provided in the wall surface of an embedding box such as a concrete handhole. The joint between the through hole and the joint member is filled with an adhesive, and the annular packing material having elasticity externally fitted on the outer peripheral surface of the joint member is covered with the adhesive filled in the joint. It may be shipped in a state of being fixed together, or the joint member and the underground box for wiring are separately brought to the construction site, and at the time of embedding the embedding box, an epoxy resin adhesive or an adhesive such as mortar, The joint member may be fixed to the through hole of the embedding box as described above.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of a main part of an underground wiring box according to an embodiment of the present invention in a partially cut-away state. This underground box for wiring has a joint member 10 fixed to a through hole 1A provided in a side wall 1B of a handhole 1 made of concrete or the like with an adhesive S.

The embedding box may be of any size and type, such as a manhole larger than the handhole or a box smaller than the handhole, in addition to the handhole 1 shown in the figure.

The joint member 10 is formed of a synthetic resin such as polyethylene, for example, and is formed in a tubular shape having both ends opened as shown in the figure. The proximal opening 11 and the distal opening 1 are each formed in a bell-mouth shape that expands outward toward the opening end so that they are not caught when moved in the center direction.
2 and an intermediate cylindrical portion 13 connecting these opening portions 11 and 12 at both ends. On the outer surface of the cylindrical portion 13 on the side of the base opening 11, at appropriate intervals in the circumferential direction,
Four columnar projections 14 are provided to prevent the joint member 10 from coming off and rotating. The shape of the base opening 11 and the tip opening 12 of the joint member 10 may be a shape other than the bell mouth shape shown in the figure, and the shape of the joint member 10 may be the shape shown in the figure. It is not limited. The joint member 10 can be made of various materials such as ceramic and metal, in addition to being made of the above-mentioned synthetic resin such as polyethylene.

The joint member 10 is provided with an annular packing material 15 having elasticity, such as rubber packing, on the outer peripheral surface on the base end opening 11 side of the cylindrical portion 13 closer to the opening end than the projection 14. It fits. In FIG. 1, the annular packing material 15 has only one outer fitting on the outer surface of the joint member 10. For example, two or more annular packing materials have been fitted at predetermined intervals. In this case, furthermore, in this case, the plurality of annular packing materials may have different thicknesses and cross-sectional shapes.

In order to fix the joint member 10 to the hand hole 1, first, the joint member 10 is inserted into the through hole 1A formed in the side wall 1B of the hand hole 1, and then the joint member 10 is inserted between the through hole 1A and the joint member 10. An adhesive S such as an epoxy resin (for example, “Epoxy Bond E”, manufactured by Konishi Co., Ltd.) or mortar is applied to the joint opening of the joint member 10 at the base opening 11.
The joint member 10 is adhered and fixed to the handhole 1 by filling with the annular packing material 15 provided on the outer surface on the side covered. As in this embodiment, an elastic annular packing material 15 such as a rubber packing, which is fitted on the outer peripheral surface of the joint member 10 on the base end opening 11 side, allows the joint member 10 to pass through the handhole 1. The base opening 11 is inserted into the hole 1A.
Is fixed in such a manner that it is aligned with the inner surface of the side wall 1B,
In order to ensure that the annular packing material 15 is located in the side wall of the handhole 1 and is covered with the adhesive S filled in the joints, the annular packing material 15 is inserted from the end of the base opening 11 side.
Is preferably provided at a position where the distance to the handhole 1 is smaller than the thickness of the side wall of the handhole 1.

According to the handhole 1 which is the underground wiring box according to the present invention as described above, the handhole 1 is buried underground due to an impact at the time of construction or shrinkage due to heat after the burying. Suppose side wall 1B of handhole 1
In the case where the adhesive S filled in the joint portion between the through hole 1A and the joint member 10 and the joint member 10 are separated, the outer peripheral surface of the joint member 10 may be made of rubber packing or the like. An annular packing material 15 having elasticity is interposed, and the annular packing material 15 is provided with an adhesive S such as an epoxy resin adhesive or mortar filled in joints and a joint member 10 made of a synthetic resin such as polyethylene. However, since it adheres well to any member, there is no gap between the adhesive S at the joint and the outer surface of the joint member 10, and water leakage is prevented.

Next, FIG. 2 is a side view of a main part of another embodiment of the underground wiring box according to the present invention, with a part thereof being cut away. This underground box for wiring also has a joint member 20 fixed to a through hole 1A provided in a side wall 1B of a handhole 1 made of concrete or the like with an adhesive S, similarly to the previous embodiment. is there. In this case as well, the embedding box may be of any size and type, such as a manhole larger than the handhole or a box smaller than the handhole, in addition to the handhole 1 shown in the figure.

The joint member 20 in this embodiment is formed of a synthetic resin such as polyethylene, ceramic, metal, or other various materials, and is formed in a tubular shape having both ends opened as shown in FIG. The base end opening 21 and the tip end opening are each formed in a bell mouth shape that expands outward toward the opening end so that the underground pipe or the like to be inserted and connected is not caught when moved in the axial direction of the pipe. Part 2
And 2. A bellows portion 23 is provided on the outer surface on the base end opening 21 side, and an annular groove 24 is provided along the outer peripheral surface of the joint member 20 adjacent to the bellows portion 23.
The groove 2 provided on the outer peripheral surface of the joint member 20
4, a ring packing material 25 having elasticity such as rubber packing is externally fitted, and after this joint member 20 is inserted into a through hole 1A formed in the side wall 1B of the handhole 1,
An adhesive S such as epoxy resin or mortar is coated on the joint between the through-hole 1A and the joint member 20 with an annular packing material 25 fitted over the concave groove 24 on the outer peripheral surface of the joint member 20. After filling, the joint member 20 is bonded and fixed to the handhole 1 with the adhesive S.

As in this embodiment, a concave groove 24 is provided on the outer peripheral surface of the joint member 20 and an elastic packing material 25 such as a rubber packing is externally fitted to the concave groove 24 to obtain an annular packing. The position of the material 25 can be prevented, and at the same time, by filling the concave groove 24 with an adhesive S such as an epoxy resin adhesive or mortar, the adhesive S and the joint member are formed in the concave groove 24. 20 and the joint member 20 can be more reliably prevented from leaking due to the close contact between the adhesive member S and the joint member 20 via the annular packing material 25. In addition, the bellows portion 23 provided on the outer peripheral surface of the base end side opening portion 21 of the joint member 20 increases the contact area between the joint member 20 and the adhesive S to improve the adhesive strength between the two, and also sets Has a function of preventing the joint member 20 from coming off due to the concave-convex fitting between the adhesive S and the bellows 23.

[0019]

As described above, according to the present invention, the wall of the buried box is affected by the impact when the buried box such as a handhole is buried in the ground and the shrinkage of each member due to the heat after the burying. Even in the case where peeling occurs between the adhesive and the joint member filled in the joint portion between the through hole and the joint member, the elastic annular packing material provided on the outer peripheral surface of the joint member, Water leakage can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a side view of an essential part of a wiring underground box according to an embodiment of the present invention, in which a part of a handhole is broken.

FIG. 2 is a side view of an essential part of a wiring underground box according to another embodiment of the present invention, in which a part of a hand hole is broken.

[Explanation of symbols]

1: Hand hole, 1A: Through hole, 1B: Side wall, 10:
Joint member, 11: proximal opening, 12: distal opening, 1
3: cylindrical part, 14: protrusion, 15: annular packing material, 2
0: joint member, 21: base end opening, 22: tip opening,
23: bellows part, 24: concave groove, 25: annular packing material,
S: adhesive.

Claims (3)

[Claims] 1. A joint member formed in a tubular shape with both ends opened and an annular packing material having elasticity fitted to an outer peripheral surface on one end opening side fixed to an underground box for wiring. With the one end opening side where the annular packing material is externally fitted inserted into a through hole provided in the wall surface of the buried box, the annular packing is filled with an adhesive filled in a joint between the through hole and the outer peripheral surface of the joint member. An underground box for wiring, which is fixed in a state where the material is covered with an adhesive. 2. The underground wiring box according to claim 1, wherein the elastic annular packing material is a rubber packing. 3. The underground wiring box according to claim 1, wherein the annular packing material is externally fitted into a concave groove portion provided on an outer peripheral surface of the joint member.