JP2001208245A - Pipe connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting structure having high safety capable of absorbing deviation when a pipe is largely moved in an earthquake in a connecting part of an optical cable outer tube to a handhole end wall. SOLUTION: A synthetic rubber sleeve having a folding part in an intermediate part is adopted as a joint and bound to the handhole end wall port and the outer tube in the both sides of the fold with a ring and a belt, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe material for laying an optical cable network or the like for improving an information communication infrastructure for an advanced information society, and more particularly, to an underground burial for housing an optical fiber or the like. The present invention relates to a joint structure for connecting a mold outer tube and a work handhole.

[0002]

2. Description of the Related Art When laying an optical cable underground, in order to facilitate branching and expansion of the cable, a double structure of an inner tube or a sheath tube containing an optical fiber and an outer tube passing therethrough is used. There will be a space for additional inner pipes. Hand holes are provided at appropriate intervals in the pipeline. For such a connection structure between the pipeline and the handhole wall, it is particularly required to have seismic resistance that does not damage the cable body even during an earthquake, and ease of manufacturing and construction.

[0003] Further, in order to be able to easily cope with the case where the inner pipe needs to be added or repaired, a fixing plate that can be removed from the inside of the hole is fixed to the mouth of the hand hole after the outer pipe and the hand hole are connected. The technique of holding the inner tube is used.
FIG. 4 shows an example of a connection structure using this fixing plate.

[0004] In Fig. 4, reference numeral 1 denotes a wall forming a handhole wall, 2 denotes a mortar portion cast around a handhole opening, 3 denotes an outer tube, 4 denotes an inner tube, and 5 denotes a fixing plate. It is. The duct sleeve 8 is embedded in the mortar 2 together with a nut for fixing the fixing plate 5. Duct sleeve 8
After the outer tube 3 is inserted into the end of the hole, the fixing plate 5 is mounted from the inside of the handhole and screwed to the nut 6 with the bolt 7. The inner pipe 4 passes through a hole provided in the fixing plate 5. The outer tube 3 and the duct sleeve 8 are fixed by a fastening band (not shown).

[0005]

However, in this structure, when the outer tube moves largely in the axial direction, it is difficult to absorb the displacement because the joint portion has a small extension. Therefore, an object of the present invention is to provide a highly secure connection structure capable of responding to mutual movement in preparation for a disaster such as an earthquake.

[0006]

According to the first aspect of the present invention, a portion made of a flexible material is provided at an intermediate portion of a sleeve in advance in a front-rear direction, and a base portion of the sleeve is provided on a wall and the other portion is provided on a wall. This is a connection structure between a wall body and a pipe line in which a support portion is connected to an outer surface of an outer pipe.

That is, in the connection structure of the present invention, the sleeve serving as the joint comprises a support portion for supporting the outer tube, and a base portion which is applied to the mouth of a wall such as a handhole and is pressed against the mouth by an expansion ring. The structure has a folded part between them.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of each embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a longitudinal sectional view showing a pipeline connection structure according to the present invention. In the figure, 1 is a concrete wall of a handhole, 3 is an outer pipe, 4 is an inner pipe, and 5 is a fixing plate made of fiber reinforced plastic. Reference numeral 10 denotes a synthetic rubber sleeve including a base portion 10a, an intermediate folded portion 10b, and a support portion 10c, which is formed in the folded portion 10b so as to be bent in a Z-shaped cross section in advance. A stopper 10d is formed at the tip of the base 10a along the inner surface of the wall 1 to facilitate positioning of the sleeve 10.

FIG. 2 shows the expansion ring 11 and the expansion jig 12 as viewed from the pipe side in the axial direction. 11 is the sleeve 10
Is a steel ring for pressing and fixing the opening to the mouth of the wall body 1, and a cutout portion for inserting a wedge piece is provided in a part thereof. A plurality of projections 11a are provided at substantially equal intervals from the edge of the expansion ring 11 facing the inside of the wall, and a plurality of projections 11a projecting inwardly of the pipe are provided, and a nut 11b for fixing the fixing plate is welded to each. Wedge-shaped protrusions 11c, 1 are provided at both ends of the expansion ring 11.
1c is provided. Reference numeral 12 denotes an expansion jig used to expand the expansion ring 11 and insert a wedge piece. The expansion jig body 12a includes a pair of shafts having left and right threads on both sides of a prismatic base. And substantially prismatic legs 12b, 12b screwed into the pair of shafts, respectively. Each of the legs 12b has an engaging portion complementary to the tip of the wedge-shaped protrusion 11c of the expansion ring 11.

Reference numeral 13 denotes a steel band for binding the sleeve 10 to the outer surface of the outer tube 3, which is fastened by a known means such as a bolt. The surface of the sleeve 10 pressed against the wall 1 and the outer tube 2 can be provided with irregularities for preventing slippage. Reference numeral 14 denotes a bolt for screwing the fixing plate 5 to the nut 11b.

[0012]

In order to construct the connection structure of the present invention, first, the sleeve 10 is attached to the mouth of the wall 1 from the inside of the handhole,
The expansion ring 11 is brought into contact with the inside and the expansion jig 1
Insert 2. When the base of the bolt 12a is rotated using an appropriate tool, the two legs 12b,
12b separates and expands the notch portion of the expansion ring 11, and inserts a wedge piece (not shown) into the opened notch portion to press the sleeve 10 against the wall 1 and join it. Next, the outer tube 3 is inserted through the distal end opening of the sleeve 10, and the band 13 is wound around from the outside of the sleeve and bound. Finally, the fixing plate 5 is brought into contact with the inside of the handhole, and the bolt 14 is screwed into the nut 11b through the hole of the fixing plate to complete the connection.

If it is necessary to add or repair the inner pipe 4 after the construction, it is sufficient to remove only the fixing plate 5 from the inside of the handhole, perform the necessary work, and then attach the fixing plate 5 again.

[0014]

The connection structure of the present invention has a folded portion 10b in the middle of the sleeve, and has a sufficient margin for the extension for deformation, so that the earthquake causes vertical and horizontal relative movement. In addition to the above case, it is possible to easily cope with the case of the relative movement in the front-rear direction as shown in FIG.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an upper part of a connection structure of the present invention.

FIG. 2 is a view of a ring and an extension jig as viewed from the front.

FIG. 3 is an explanatory view showing a modified example at the time of an earthquake.

FIG. 4 is a longitudinal sectional view of a conventional connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handhole wall body 3 Outer pipe 4 Inner pipe 5 Fixing plate 10 Sleeve 10b Folded part 11 Expansion ring

Continued on the front page (72) Inventor Hiroto Hayashi 30-2 Shinhocho, Tokai-shi, Aichi F-term in Aronkasei Co., Ltd. 5G369 AA19 BA04 BA06 DC10 DD02

Claims (1)

[Claims] 1. A wall formed by providing a folded portion in the front-rear direction in an intermediate portion of a sleeve made of a flexible material in advance, a base of the sleeve being connected to a wall, and a supporting portion being connected to an outer tube, and a pipe and a sleeve. Pipeline connection structure.