JPH01105821A - Increase of duct and execution thereof - Google Patents

Abstract

PURPOSE:To prevent cracks or water leaking of a structure, to shorten the working hours and to improve safety by inserting an extension duct sleeve providing with a collar section and screw section into a through hole which was bored mechanically and fixing with a clamping ring through adhesives. CONSTITUTION:A collar section 12-1 larger than a diameter of a through hole and an extension duct sleeve 12 forming a screw section 12-2 which is continuous to the collar section 12-1 are inserted into the through hole bored on the side wall 2 of a manhole by a boring mechanical means by adhering resin mortar and others to the surface of a metallic duct sleeve 3. At that time, adhesives 13 are applied between skirt walls of the through hole and to the face opposite to the side wall 2 of the manhole and etc. of a clamping ring 14. The clamping ring 14 is screwed into the screw section 12-2 to hold the side wall 2 by the collar section 12-1 and to fix the extension duct sleeve 12 through adhesives 13.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a duct extension port and a construction method thereof.
In particular, the present invention relates to a duct extension opening in which a pipe member for accommodating a communication cable or the like is connected to an underground structure such as an existing manhole by a connecting means, and a construction method thereof.

(Prior Art) An example of this type of conventional technology is shown in FIG. Although not shown in Figure 2 (a), (b), and (d), a pipe member that accommodates a communication cable, etc., is connected by penetrating the side wall 2 of an underground structure such as an existing manhole. FIG. 2 is an explanatory cross-sectional view of the conventional structure of a duct extension port and its construction method.

As shown in Fig. 2(,), an insertion hole 2-1 for a duct extension opening is made in a side wall 2 of a manhole or the like formed in a predetermined part of an underground structure using an excavating means 1, for example, by hand or with a light pick hammer. The hole is excavated to be larger than the outer diameter of the sleeve 3 described in .

Next, as shown in Figure 2, the duct sleeve 3 is inserted into the insertion hole 2-1, and the duct opening mold 4 is inserted into the insertion hole
Attach laces to both ends. The formwork 4 is made of wood or the like to suit the circular dimensions of the duct sleeve.

Next, as shown in FIG. 2(C), concrete 5 is poured into the gap between the insertion hole 2-1 shown in FIG. 2(b) and the outside of the duct sleeve 3 to form the insertion hole 2-1. and the duct sleeve 3 are fixed.

Next, as shown in FIG. 2(d), the formwork 4 is removed after waiting for the concrete 5 to set, and the duct extension opening is completed.

As explained above, in the conventional technology, as mentioned above, the above-mentioned through hole (Fig.
, )ω) 0 The duct extension opening was installed using the construction method shown in (d).

(Problems to be Solved by the Invention) However, in forming a duct extension opening into an underground structure such as an existing manhole using the above-mentioned conventional technique, there are drawbacks such as the following problems.

1) It takes several days to drill the insertion hole for the duct expansion opening, create and install the formwork, pour concrete, and cure the concrete.

2) Excavation methods for underground structures such as existing manholes, i.e. only by hand or using a light pick hammer etc. When breaking the structure of an existing manhole etc., the tip of the hand slips, There is a risk of causing damage to communication cables housed near a designated location.

3) Cracks may occur in underground structures such as existing manholes due to impact when the structure of existing manholes, etc. is destroyed by hand or with a light pick hammer.

4) When destroying existing manholes etc. by hand or using a light pick hammer, etc., dust is generated and the work environment deteriorates.

5) Entering into the excavation trench, drilling work, formwork creation and installation,
Lack of safety due to long working hours such as concrete pouring and concrete curing.

6) Water leaks from the concrete joints due to poor adhesion between the concrete that has been poured for several years and the concrete poured during expansion.

There were problems as described above.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, a through hole is provided in a predetermined part of an existing underground structure such as a manhole, and a communication cable, etc. is inserted into the through hole. In a duct extension opening formed to provide a pipe member to be inserted, a through hole is drilled by drilling machine means in a predetermined part of the underground structure such as the manhole, and a flange portion with a diameter larger than the through hole is provided at one end. an extension duct which is continuous with the flange, has a length greater than the depth of the through hole in the longitudinal direction, has resin mortar etc. applied to its surface, and has a threaded surface formed on the applied surface. The sleeve and the tightening member screwed into the threaded part provided on the extension duct sleeve are made of a ring and an adhesive, and one of the through holes is made of a ring and an adhesive.
Insert an extension duct sleeve between the wall surface of the through-hole and the wall surface of the through hole using adhesive, tighten the threaded part of the extension duct sleeve that protrudes from the other surface, and screw the ring into the duct. He designed the expansion opening and also the construction method.

(Function) Since the present invention has the above-mentioned through-hole construction, the drawbacks of various problems in forming duct extension openings to underground structures such as existing manholes according to the above-mentioned conventional techniques are solved in the following way. .

1) The drilling work to penetrate the duct sleeve for expansion into underground structures such as existing manholes is mechanized, and by blocking the circumference of the duct sleeve for expansion, concrete destruction, formwork creation and installation, and concrete pouring are reduced. There is no installation and curing process, and the work time can be shortened.

2) Water leakage can be prevented by using adhesive to connect the expansion duct sleeve.

3) It is possible to prevent damage to communication cables and the human body due to digging means such as hand-only or light pick hammer.

4) It is possible to improve the work environment by preventing the generation of dust □ when the body is destroyed by the excavation means.

5) Safety can be improved because the working time inside the excavated trench can be significantly shortened.

(Example) An example of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view illustrating a duct extension opening and its construction method according to an embodiment of the present invention, and FIG. In FIG. 1(,), 11 is a drilling machine means, and 2 is a side wall of a manhole etc., a part of which is shown in the figure. Although the details of the drilling machine means 1 are not shown in the drawings, the rotation of the drilling tools 1 and 2 of the drilling machine means 11 supported and moved on the support shaft 11-1 causes the through hole 2-1 to form in the side wall 2 of the manhole, etc. Mechanically excavated. FIG. 1) is a sectional view illustrating insertion of an additional duct sleeve. In FIG. 1(b), 12 is an extension duct sleeve, 3 is a duct sleeve, and 13 is an adhesive. The expansion duct sleeve 12 is inserted into a through hole 2-1 drilled in a side wall 2 of a manhole or the like. As shown in the figure, the expansion duct sleeve 12 has a diameter of the through hole 2-1 on the front surface of the duct sleeve 3.
A large flange 12-1 is provided, a threaded portion 12-2 is provided continuously in the longitudinal direction of the flange 12-1, and the flange 12-1 and the threaded portion 12-2 are made of metal. The surface of the duct sleeve 3 is coated with resin mortar or the like, and the threaded portion 12-2 is threaded. When inserting the expansion duct sleeve 12 into the through hole 2-1 provided in the side wall 2 of the manhole, etc., the ring 14 should be tightened between the wall surface of the through hole 2-1 and the tightening described later. Adhesive 13 is applied to the surface.

FIG. 1(c) is a sectional view illustrating the tightening ring installation.

In FIG. 1(c), 14 is a tightening ring, and the tightening ring 14 is a manhole, etc. of the collar 12-1 of the extension duct sleeve 12 inserted into the through hole 2-1 of the side wall 2. It is provided on the other side of the side wall 2 so as to sandwich the wall surface, and is screwed into the threaded portion on the surface of the extension duct sleeve 12 to fix the extension duct sleeve 12 to the side wall 2 such as a manhole together with the adhesive 13. The fastener 1114 is a member having a nut function and made of a stretchable material such as resin mortar or neoprene rubber.

FIG. 3 is a cross-sectional side view of the main part of the duct extension port according to the embodiment of the present invention, and FIG.
FIG. 3 (6) is a partially sectional front view of the tightening ring 14.

Figure 4 shows the duct sleeve 12 of Figure 3 and the tightening ring 14.
FIG. In Figure 3 (,), the duct sleeve 3
The side of the expansion duct sleeve 1 is made of resin mortar.
The flange 12-1 provided at the end has a larger diameter than the through hole 2-1, and the length of the extension duct sleeve in the longitudinal direction is larger than that of the through hole 2. −
The depth is greater than 1, and the surface has a tightening ring 14.
A threaded surface is formed for threading. A in Figure 3 (,)
The shapes of the -A' and B-B' sections are as shown in FIG.

(Effects of the Invention) As explained above, the duct extension port and its construction method according to the present invention have the following advantages.

1) Work time can be significantly shortened by mechanizing hole-drilling work and eliminating the work processes of formwork creation and installation, concrete pouring, and concrete curing. This also makes it possible to reduce the impact on road traffic and local communities.

2) The use of block-shaped expansion duct sleeves and adhesives makes it possible to prevent water leakage from concrete joints.

3) It is possible to prevent damage to the accommodation cable when an existing manhole or other structure is destroyed by a hand chisel or a light hammer.

4) It is possible to prevent cracks from occurring due to the impact when an existing manhole or the like is destroyed by a hand chisel or a light hammer.

5) It is possible to prevent the generation of dust, etc. when an existing manhole, etc. is destroyed by a hand chisel or a light pick hammer.

6) The work time inside the excavation trench can be significantly shortened by mechanization and block formation, which improves safety.

Additionally, this system not only accommodates communication cables, but also includes tubes that accommodate power, CAT'V, etc. cables.
It has the advantage that it can be applied to connections with all kinds of underground structures such as manholes, handholes, towways, and cabs.

[Brief explanation of the drawing]

Fig. 1 is a sectional view explaining the duct extension opening and its construction method according to an embodiment of the present invention, Fig. 1 (,) is an illustrative sectional view of opening a hole by drilling machine means, and Fig. 1 (b) is a duct sleeve for extension. Figure 1(c) is a cross-sectional view for explaining the insertion of the tightening ring, Figure 2 is a cross-sectional view for explaining the connection structure between a conventional pipe member and an existing manhole, etc., and its construction method. Figure 2 (,) is an explanatory diagram of the means for excavating the side wall 2 of a manhole, etc. Figure 2 (b) is a cross-sectional diagram illustrating the installation of the duct sleeve and the installation of the formwork.
Figure (c) is a sectional view explaining concrete pouring, Figure 2 (d)
) is a cross-sectional view of the connection structure between a conventional pipe member and a manhole, etc.
FIG. 3 is a cross-sectional side view of the main part of the duct extension port according to the embodiment of the present invention, FIG. FIG. 4 is a partial sectional view of the expansion duct sleeve 12 and tightening ring 14 shown in FIG. 3.
It is a sectional view. DESCRIPTION OF SYMBOLS 1... Excavation means, 2... Side wall of an underground structure such as a manhole, 2-1... Through hole, 3... Duct sleeve,
4... Formwork, 5... Pouring concrete, 1...
Hole drilling machine means, 11-1... Support shaft, 11-2... Hole drilling tool, 12... Duct sleeve for expansion, 12-1...
・Flame part, 12-2... Threaded part, 13... Adhesive, 1
4...Tighten with a ring. Printing of the drawings (Explanatory cross-sectional view of drilling holes by drilling machine means Fig. 1 (Q) Fig. 1 (b) Explanatory cross-sectional view of the duct extension according to the embodiment of the present invention [] and its construction method Fig. 1 (C) Figure 2 (b) Cross-sectional diagram explaining conventional concrete pouring Figure 2 (C) Figure 2 (d) February 1, 1988

Claims (2)

[Claims] (1) At a duct extension opening formed by providing a through hole at a predetermined location of an existing underground structure such as a manhole and installing a pipe member for inserting a communication cable etc. into the through hole, a through hole drilled in a predetermined location by a drilling machine; a flange having a diameter larger than the through hole at one end; a duct sleeve for expansion, the surface of which is coated with resin mortar or the like and a threaded surface formed on the surface thereof; a tightening ring that is screwed into the threaded portion provided on the duct sleeve for expansion; Insert an extension duct sleeve from one side of the through hole with the wall surface of the through hole via an adhesive, and tighten the threaded portion of the extension duct sleeve that protrudes from the other side. A duct extension opening characterized by being configured by screwing together a ring. (2) A method for constructing a duct expansion opening in which a through hole is provided in a predetermined part of an existing underground structure such as a manhole, and a pipe member into which a communication cable, etc. is inserted is provided in the through hole, A through hole is drilled in a predetermined part of the underground structure by a drilling machine, and the through hole has a flange having a diameter larger than that of the through hole at one end, and the through hole is continuous with the flange in the longitudinal direction. An extension duct sleeve having a length greater than the depth of the through hole, whose surface is coated with resin mortar, etc., and whose threaded surface is formed, is placed between it and the wall surface of the through hole through an adhesive. A method for constructing a duct extension opening, characterized in that the opening is inserted through the through hole from one end thereof, and a tightening ring is screwed onto a protrusion of the extension duct sleeve at the other end.