JP3754161B2 - Mounting structure for large-diameter pipes in manholes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for attaching a large-diameter pipe to a manhole housing, and more particularly, to a structure for attaching a large-diameter pipe that can solve a problem that occurs when attaching a large-diameter pipe to a manhole housing.
[0002]
[Prior art]
As a structure for attaching a mounting tube to a manhole housing, for example, a structure as shown in Japanese Utility Model Publication No. 4-32543 developed by the present applicant is known. Including these known techniques, various structures have been implemented as the structure for attaching the attachment tube to the manhole housing, but generally the attachment pipe has a diameter of 350 mm or less. Thus, when mounting the mounting pipe having a diameter of 350 mm or less to the manhole housing, the mounting structure is configured such that the outer peripheral surface of the mounting socket or the like is pressed against the inner peripheral edge of the mounting tube hole formed in the manhole housing.
[0003]
[Problems to be solved by the invention]
However, generally, when a large-diameter pipe having a diameter of 400 mm or more is to be attached to the mounting hole for the manhole housing, the large-diameter pipe 23 is installed in the mounting tube hole 22 formed in the manhole housing 21, as shown in FIG. Is inserted between the upper and lower outer peripheral portions of the large-diameter pipe 23 and the upper and lower edges of the mounting pipe hole 22, and the left and right outer peripheral portions of the large-diameter pipe 23 and the left and right edges of the mounting pipe hole 22 are in contact with each other. Since the position of B is significantly different from B, even if a flexible socket (not shown) is matched to the curved shape of the manhole housing 21, the socket can completely hold the outer peripheral surface of the large-diameter pipe. There was a problem that was difficult.
[0004]
In order to improve the above-mentioned conventional problems, the present patent applicant has already used a steel socket and a flexible socket, and by combining these two types of sockets, a large-diameter pipe is formed into a manhole housing. A technology for mounting a large-diameter pipe in a manhole that smoothly attaches to a mounting pipe hole has been developed and a patent application has been filed (Japanese Patent Application No. 7-261349).
[0005]
By carrying out the invention of the large-diameter pipe mounting structure in the manhole according to the above-mentioned patent application, the large-diameter pipe can be smoothly and stably in the manhole housing via the steel socket and the flexible rubber socket. It can be attached to. However, when the present invention is implemented, it has been found that if there is a large vibration due to an earthquake or the like, the connection portion between the steel socket and the flexible rubber socket may be disconnected.
[0006]
The mounting structure of a large-diameter pipe in a manhole according to the present invention is a new invention which is a further improvement of the above-described invention, and in particular, the above-described steel socket and a flexible rubber inserted into the steel socket. Technology for mounting large-diameter pipes in manholes with a new structure that makes the connection with the sockets stronger and prevents the sockets from being disconnected even when there is a large vibration such as an earthquake. Is to provide.
[0007]
[Means for Solving the Problems]
The mounting structure for a large-diameter pipe in a manhole according to the present invention is an invention that has fundamentally improved the above-mentioned problems, and the gist of the first invention is for a mounting pipe drilled in the wall surface of a manhole housing. In the structure in which the large-diameter pipe is attached to the hole, the base portion of the rigid socket having an inner diameter sufficiently larger than the outer diameter of the large-diameter pipe is attached and fixed around the mounting pipe hole of the manhole housing. A pair of parallel projecting rings are provided on the inner peripheral surface of the distal end portion at a predetermined interval, and the base portion of the flexible socket is inserted into the distal end portion of the rigid socket. The base portion of the flexible socket is crimped and fixed to the inner peripheral surface of the rigid socket by the projecting ring, and the outer peripheral surface of the large-diameter pipe inserted into the flexible socket, the rigid socket, and the mounting tube hole. Through a steel band Tip of the flexible socket Te is the mounting structure of the large-diameter pipe in the fixed manhole tightening.
[0008]
A second aspect of the present invention is characterized in that a pair of parallel projecting rings provided on the inner peripheral surface of the distal end portion of the rigid socket are connected to each other via a flat band. 1 is a mounting structure of a large-diameter pipe in a manhole of the invention.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an enlarged cross-sectional explanatory view of a main part of the mounting structure according to the present invention, and FIG. 2 is a schematic diagram illustrating the structure of the mounting structure for a large-diameter pipe in a manhole according to the present invention. Sectional explanatory drawing which shows the structure of the whole attachment structure of FIG. 3, FIG. 3 is explanatory drawing of the principal part.
[0010]
In FIG. 1 to FIG. 3, reference numeral 1 denotes a manhole housing, which has a mounting tube hole 2 having a large inner diameter into which a large-diameter tube can be inserted. Reference numeral 3 denotes a large-diameter pipe that can be inserted into the mounting pipe hole 2.
[0011]
Next, 4 is a rigid socket, which has an inner diameter sufficiently larger than the outer diameter of the large-diameter pipe 3, and is made of a material such as steel, FRP, or resin concrete. In addition, a flange 5 capable of coming into contact with the outer peripheral surface of the manhole housing 1 is integrally provided at the original end edge of the rigid socket 4. Reference numeral 6 denotes a flexible socket, which is made of a material such as a rubber material or a soft plastic. The flexible socket has an inner diameter through which the large-diameter tube 3 can be inserted, and an outer diameter that can be inserted into the rigid socket 4.
[0012]
On the inner peripheral surface of the distal end portion of the rigid socket 4, two parallel projecting rings 7 and 8 project in a predetermined distance from each other. These protruding rings 7 and 8 are formed of a steel ring and are welded to the rigid socket 4. These projecting rings 7 and 8 can be configured to be connected to each other via a steel flat band. The width of the ring concave groove 9 formed between the projecting rings 7 and 8 is formed to be slightly larger than the width of the diameter-enhanced pressing metal fitting 10 described later.
[0013]
In the construction of the large-diameter mounting structure according to the present invention, as shown in FIGS. 1 to 3, first, the flange 5 of the rigid socket 4 is brought into contact with the outer peripheral surface of the manhole housing 1, and the manhole housing 1 is preliminarily contacted. The rigid socket 4 is attached and fixed to the manhole housing 1 by screwing bolts 12 into anchors 11 embedded in the outer wall. Further, a gap formed between the flange 5 of the rigid socket 4 and the outer peripheral surface of the manhole housing 1 is filled with a sealing material (not shown), whereby the flange 5 and the outer peripheral surface of the manhole housing 1 are filled. Ensure water stoppage in between.
[0014]
Next, the base of the flexible socket 6 is inserted into the rigid socket 4, and a part of the outer peripheral surface of the base of the flexible socket 6 is a ring groove formed by a pair of projecting rings 7, 8. The base of the flexible socket 6 is placed on the base of the rigid socket 4 by pushing the wide-diameter presser fitting 10 while abutting it against the inner peripheral surface of the base of the flexible socket 6. The flexible socket 6 is connected to the rigid socket 4 by crimping and fixing in the ring concave groove 9.
[0015]
As described above, when the diameter-enlarged presser fitting 10 is brought into contact with the inner peripheral surface of the base portion of the flexible socket 6, the position of the enlarged-diameter presser fitting 10 is provided in the rigid socket 4 by the pair of projecting rings 7, 8. The position is aligned with the ring groove 9. In this state, when the diameter-enlarged holding metal fitting 10 is pushed and expanded, a part of the flexible socket 6 is forcibly press-fitted into the ring groove 9 by the diameter-enlarged holding metal fitting 10, whereby the flexible socket 6 Even when a shearing force is generated due to a large vibration or the like, the flexible socket 6 can be prevented from being pulled out of the rigid socket 4 and falling off.
[0016]
Further, the large-diameter tube 3 is inserted from the distal end portion of the flexible socket 6 and inserted into the flexible socket 6, the rigid socket 4 and the mounting tube hole 2 of the manhole housing 1, and the distal end of the flexible socket 6 is inserted. The tip of the flexible socket 6 is fixedly attached to the large-diameter tube 3 by tightening the portion with one or a plurality of steel bands 13 from the outer peripheral surface thereof. By comprising in this way, the attachment structure of a large diameter pipe can be completed.
[0017]
In the above embodiment, the operation of attaching the rigid socket 4 around the mounting tube hole 2 of the manhole housing 1, the operation of welding the pair of projecting rings 7 and 8 to the inner surface of the rigid socket 4, and the rigid socket 4 The operation of inserting and attaching the flexible socket 6 inside can be carried out in the factory. Therefore, it is possible to attach with high accuracy and to simplify the work of installing the large-diameter pipe 3 in the field.
[0018]
As described above, the large-diameter pipe mounting structure according to the present invention attaches the rigid socket 4 around the mounting pipe hole 2 of the manhole housing 1, and attaches and connects the flexible socket 6 to the rigid socket 4. In addition, since the flexible socket 6 is fastened and fixed around the large-diameter tube 3 inserted through the flexible socket 6 via the steel band 13, the manhole can be stably placed in the large-diameter tube 3. It can be attached and fixed to the housing 1. Further, since the base portion of the flexible socket 6 is firmly attached to the inner peripheral surface of the distal end portion of the rigid socket 4 via the pair of projecting rings 7 and 8 and the enlarged diameter holding metal fitting 10, the flexible socket 6 There is no worry that 6 will fall out of the rigid socket 4.
[0019]
【The invention's effect】
As described above, the large-diameter pipe mounting structure in the manhole according to the present invention is such that the large-diameter pipe is attached to the manhole housing via the rigid socket and the flexible socket. A caliber tube can be attached to the manhole housing. In particular, even when the contact position between the large-diameter pipe and the mounting hole for the manhole housing differs greatly between the top and bottom and the left and right, the area of the rigid socket or flexible socket that contacts the manhole housing or large-diameter pipe is increased. Therefore, these bonds can be stabilized and strengthened.
[0020]
Further, a pair of projecting rings are provided on the inner peripheral surface of the rigid socket, a ring groove is formed between them, and a part of the base portion of the flexible socket is press-fitted into the ring groove to provide a rigid socket. Since the flexible socket is connected to the flexible socket, there is no fear that the flexible socket will fall out of the rigid socket even if a large shearing force or the like is applied to the connecting portion due to an earthquake or the like.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional explanatory view of a main part of a mounting structure according to the present invention.
2 is a cross-sectional explanatory view showing the configuration of the entire mounting structure of FIG. 1;
FIG. 3 is an explanatory diagram of a main part.
FIG. 4 is a cross-sectional explanatory diagram for explaining problems in a conventional large-diameter pipe mounting structure.
[Explanation of symbols]
1 Manhole housing 2 Mounting tube hole 3 Large diameter tube 4 Rigid socket 5 Flange 6 Flexible socket
7,8 Protruding ring 9 Ring groove
10 Expanded holding bracket 11 Anchor
12 bolt 13 rigid band

Claims (2)

In a structure in which a large-diameter pipe is attached to a mounting pipe hole drilled in the wall of the manhole housing, the base of the rigid socket having an inner diameter sufficiently larger than the outer diameter of the large-diameter pipe is the mounting pipe hole of the manhole housing A pair of parallel projecting rings are provided on the inner peripheral surface of the distal end of the rigid socket at a predetermined interval, and the base of the flexible socket is inserted into the distal end of the rigid socket. In addition, the base of the flexible socket is fixed to the inner peripheral surface of the rigid socket by a diameter-enlarged presser fitting and the pair of projecting rings, and the flexible socket, the rigid socket, and the mounting tube A large-diameter tube mounting structure in a manhole in which a distal end portion of the flexible socket is fastened and fixed to a peripheral surface of a large-diameter tube inserted through a hole via a steel band. 2. A mounting structure for a large-diameter pipe in a manhole according to claim 1, wherein a pair of parallel projecting rings provided on the inner peripheral surface of the distal end portion of the rigid socket are connected to each other via a flat band. .

Images