JP4063558B2 - Pipe mounting method, flexible joint and pipe mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of attaching a pipe to a manhole via a cylindrical flexible body, and more particularly to a flexible joint including a cylindrical flexible body and a rigid ring, and a pipe mounting structure.
[0002]
[Prior art]
A flexible joint is used to connect the connecting hole of the manhole and the main pipe such as a sewer. Such a flexible joint is fixed to the manhole connection hole by an expansion band.
[0003]
Manholes used for the maintenance of sewer planes and where the direction and gradient of the sewer pipes change or where the pipe diameter changes, are constructed by placing concrete around the connection between the manhole and the main pipe. Has been done.
[0004]
In such a concrete winding method, if the relative position of the main pipe and the manhole is displaced due to ground subsidence or earthquake distortion, the concrete winding part will crack or the pipe will be pulled out from the manhole. There were drawbacks of water ingress and sewage leakage.
[0005]
Recently, rubber flexible joints that can absorb the displacement and maintain the water-stopping property even when the relative positions of the manhole and the main body are displaced have come to be used.
[0006]
[Problems to be solved by the invention]
However, the present inventor has found that it is difficult to attach the pipe to the manhole via a conventional rubber flexible joint when the angle of the pipe attached to the manhole is increased.
[0007]
An object of the present invention is to obtain a pipe mounting structure having excellent watertightness by enabling insertion of a pipe into a flexible joint without being affected by the mounting angle of the pipe with respect to the manhole.
[0008]
[Means for Solving the Problems]
The present invention provides (1) a manhole side cylindrical portion fixed to a manhole drilling portion, and a fastening band at the insertion end portion of the tube when attaching the tube to the manhole via a cylindrical flexible body. A step of preparing a tubular flexible body having a tube-side tubular portion that is fixed from , and a connecting portion that connects the manhole-side tubular portion and the tube-side tubular portion; (2) wherein the step providing a rigid ring, and (3) while maintaining said tube-side cylindrical portion in a cylindrical shape between the fastening band and the connecting portion at least one of the inner and outer circumferential sides of the pipe-side cylindrical portion The present invention relates to a tube mounting method including a step of inserting the tube into a tube side tubular portion.
[0009]
Further, the present invention is a flexible joint for attaching a pipe to a manhole, and includes a cylindrical flexible body and a rigid ring, and the cylindrical flexible body is fixed to a drilling portion of the manhole. A manhole side tubular portion, a tube side tubular portion fixed from the outer periphery using a fastening band at the tube insertion end , and a connection connecting the manhole side tubular portion and the tube side tubular portion. has a part provided between said rigid ring connecting portion and at least one in the fastening band on the inner and outer circumferential sides of the pipe-side cylindrical portion, connecting the manhole and the pipe In doing so, the rigid ring prevents deformation of the tube-side tubular portion.
[0010]
Furthermore, the present invention is a pipe mounting structure in which a pipe is attached to a manhole via a flexible joint, and the flexible joint includes a cylindrical flexible body and a rigid ring, and the cylindrical flexible body A manhole side cylindrical portion fixed to the drilling portion of the manhole, a tube side cylindrical portion fixed to the insertion end of the tube from the outer periphery using a fastening band , the manhole side cylindrical portion, and the tube and a connecting portion which connects the side cylindrical portion, said rigid ring provided between the connecting portion and the fastening band at least one of the inner and outer circumferential sides of the pipe-side cylindrical portion The tube mounting structure is characterized in that the tube is inserted into the tube-side tubular portion maintained in a tubular shape.
[0011]
The present inventor has found that the operation of inserting a tube into a conventional flexible joint is significantly hindered as the tube mounting angle with respect to the manhole increases. Such a situation will be described with reference to FIGS.
[0012]
FIG. 10 is a longitudinal sectional view showing a state where a tube is about to be inserted into a conventional flexible joint at an attachment angle θ. FIG. 11 is a partial longitudinal sectional view showing a state in which a conventional flexible joint is directed toward the mounting angle θ.
[0013]
As shown in FIG. 10, when connecting the pipe 3 to the manhole 2, when the pipe 3 is attached to the flexible joint 51 attached to the manhole at an attachment angle θ, the pipe 3 is a portion A of the flexible joint 51. At the end, it cannot be inserted into the flexible joint 51.
[0014]
Further, even if the tube insertion receiving portion 51a of the flexible joint 51 is forced toward the tube 3 in accordance with the mounting angle, the tube insertion receiving portion 51a is deformed 51b as shown in FIG. Is difficult to insert.
[0015]
In connecting the flexible joint and the pipe, prior to attaching the mounting angle to the pipe, the pipe is inserted into the flexible joint in a horizontal state without making an angle to the pipe, and then the pipe and the flexible joint are connected. May be allowed to be inserted into a flexible joint by bending the tube to a specified angle.
[0016]
However, in the case of pipe installation on the upstream side of the manhole, where the ground slope is large, the pipe is obstructed by the ground slope against the pipe insertion port of the flexible joint, so the horizontal connection cannot be taken. Can not.
[0017]
Based on this knowledge, the present inventor needs to set the pipe mounting angle to the flexible joint, and even when the pipe cannot be in a horizontal state, the pipe insertion port of the flexible joint is adjusted to the pipe mounting angle. We studied a means that allows the tube to be easily inserted, and allows the tube to be smoothly inserted into the flexible joint with a mounting angle.
[0018]
As a result, the present inventor can obtain a highly watertight pipe mounting structure that can freely correspond to the mounting angle of the pipe by using a predetermined flexible joint made of a combination of a cylindrical flexible body and a rigid ring. As a result, the present invention has been reached.
[0019]
In the present invention, a flexible joint is used to attach the pipe to the manhole. Such a flexible joint includes a cylindrical flexible body and a rigid ring.
[0020]
A cylindrical flexible body according to the present invention includes a manhole side cylindrical portion that is crimped to a drilling hole of a manhole, a tube side cylindrical portion that is crimped to a pipe, a manhole side cylindrical portion, and a tube side cylindrical portion. And a connecting portion connecting the two.
[0021]
In this invention, a rigid ring is provided in the inner peripheral side or outer peripheral side of a pipe side cylindrical part. Such a rigid ring acts to prevent deformation of the tube side tubular portion of the tubular flexible body when connecting the manhole and the tube.
[0022]
ADVANTAGE OF THE INVENTION According to this invention, the pipe | tube attachment structure excellent in watertightness can be obtained by enabling the insertion of the pipe | tube to a flexible joint, without being influenced by the attachment angle of the pipe | tube with respect to a manhole.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described.
(1) Manhole The manhole to which the present invention can be applied is not particularly limited in size, application, shape, material and the like. Examples of such a manhole include a small manhole and a manhole larger than a normal No. 1 manhole.
[0024]
Such a manhole is provided with a drilling portion for attaching a pipe. The diameter, shape, and the like of the drilled portion can be variously set.
[0025]
(2) Tube The tube according to the present invention is not particularly limited in size, application, shape, material, and the like. As such a pipe, pipes made of various calibers and materials can be used.
[0026]
(3) Flexible joint The flexible joint according to the present invention is used to attach a pipe to a manhole. Such a flexible joint imparts flexibility to the attachment portion between the pipe and the manhole, and can improve the earthquake resistance, leakage resistance, and the like of the attachment portion.
[0027]
In the present invention, such a flexible joint includes a cylindrical flexible body and a rigid ring, which will be described in detail below.
[0028]
(3-1) Cylindrical flexible body A cylindrical flexible body according to the present invention includes a manhole side cylindrical portion fixed to a manhole drilling hole, a tube side cylindrical portion fixed to a tube, and a manhole side. A connecting portion that connects the tubular portion and the tube-side tubular portion;
[0029]
In the present invention, the cylindrical shape means a shape having an outer peripheral portion and an internal space surrounded by the outer peripheral portion. The internal space may be a circular shape, a triangular shape, a polygonal shape such as a quadrangular shape, or a shape that can be variously deformed when viewed in cross section. The cylinder includes a cylinder.
[0030]
The cylindrical flexible body is not particularly limited in shape, material, etc., as long as it exhibits the desired flexibility. Such a cylindrical flexible body can be produced using various materials, preferably a material selected from the group consisting of natural rubber, synthetic rubber, soft plastic, thermoplastic elastomer, and the like, particularly an elastic material.
[0031]
The cylindrical flexible body may have a folded shape through the connecting portion or a conical shape without folding as long as the manhole side tubular portion and the tube side tubular portion are connected by the connecting portion.
[0032]
(3-1-1) Manhole side cylindrical portion The manhole side cylindrical portion is fixed to the drilling portion of the manhole. The fixing to the hole-cutting portion is preferably pressure bonding from the viewpoint of water tightness. Various means such as an expansion band can be used for the crimping.
[0033]
Such a manhole side cylindrical portion can have an inner diameter larger than the outer diameter of the insertion end of the tube. Preferably, the manhole side cylindrical portion forms a space in which the insertion end of the tube can be accommodated even when the angle of attachment of the tube to the manhole is maximized.
[0034]
(3-1-2) Tube side tubular portion The tube side tubular portion is fixed to the tube. The fixing to the tube is preferably pressure bonding from the viewpoint of water tightness. Various means such as a fastening band can be used for the pressure bonding.
[0035]
(3-1-3) The connection part The connection part is not particularly limited as long as it connects the manhole side tubular part and the tube side tubular part. Preferably, the connecting portion has a bellows portion. The bellows part can make it easy for the tube-side tubular part to follow the mounting angle of the pipe.
[0036]
(3-1-4) As long as the bellows part of the bellows part connecting part can follow the displacement of the tube side tubular part, there is no limitation on the shape, material, and the like. Such a bellows portion may be provided in the middle of the connecting portion in a state parallel to or perpendicular to the central axis of the flexible joint.
[0037]
(3-2) Rigid ring The rigid ring concerning this invention is provided in the inner peripheral side or outer peripheral side of the tube side cylindrical part of a cylindrical flexible body. Such a rigid ring functions to reinforce the tube side tubular portion of the tubular flexible body.
[0038]
Such a rigid ring can prevent deformation of the tube-side tubular portion of the tubular flexible body when the manhole and the tube are connected, and can hold the tube-side tubular portion in a tubular shape.
[0039]
The rigid ring according to the present invention may be provided by being embedded in the tube side tubular portion, and is provided by being fixed to the inner peripheral side or the outer periphery side of the tube side tubular portion using an adhesive or a fixture. May be.
[0040]
Since the rigid ring that can reinforce the tube-side tubular portion is only required to maintain its tubular state when the tube-side tubular portion of the flexible joint is displaced, it is provided on the inner or outer peripheral side of the tube-side tubular portion. The thickness, width and rigidity can be determined according to the hardness and strength of the flexible joint.
[0041]
The rigid ring includes at least one selected from the group consisting of hard vinyl chloride resin, ABS resin (resin composed of (tertiary) copolymer of acrylonitrile, butadiene and styrene), PET (polyethylene terephthalate) resin, nylon and the like. It can be formed from at least one metal that is hardly corroded selected from the group consisting of plastic, rust-proof treated steel, stainless steel, and the like.
[0042]
(4) Attaching the pipe to the flexible joint In the present invention, the pipe-side cylindrical portion of the cylindrical flexible body is reinforced by the rigid ring, so that the pipe is stably attached to the flexible joint.
[0043]
In particular, in the present invention, when it is necessary to attach a mounting angle to the pipe and the pipe cannot take a horizontal state, the pipe insertion receiving portion of the flexible joint can be easily oriented according to the pipe mounting angle. Can be smoothly inserted into a flexible joint with a mounting angle.
[0044]
In the present invention, the tube can be stably attached to the manhole even when the tube is not attached to the manhole. However, the tube is attached to the manhole at an angle of 1 to 60 °, particularly at an angle of 3 to 60 °. Even when attached, an attachment structure with excellent water tightness can be obtained.
[0045]
The present invention will be specifically described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a flexible joint as an example of the present invention. FIG. 2 is a front view of the flexible joint of FIG. FIG. 3A is a longitudinal sectional view showing an example of a rigid ring according to the present invention, and FIG. 3B is a front view of the rigid ring of FIG.
[0046]
FIG. 4 is a partial longitudinal sectional view of a flexible joint according to another example of the present invention. FIG. 5 is a partial longitudinal sectional view of a flexible joint of still another example of the present invention.
[0047]
FIG. 6 is a vertical sectional view showing one step of the pipe mounting method according to an example of the present invention. FIG. 7 is a cross-sectional view showing another process of the pipe mounting method according to an example of the present invention. FIG. 8 is a longitudinal sectional view showing one step of the pipe mounting method according to another example of the present invention. FIG. 9 is a cross-sectional view showing one step of another pipe mounting method of the present invention.
[0048]
As shown in FIGS. 1 and 2, a flexible joint 1 according to an example of the present invention includes a cylindrical flexible body 4 and a rigid ring 5. The cylindrical flexible body 4 has a manhole-side cylindrical portion 4a, a tube-side cylindrical portion 4b, and a connecting portion 4c that connects them, and the connecting portion 4c is provided with a bellows portion 4d. Further, a tube is inserted into the cylindrical flexible body 4 from the tube side insertion end 4e of the tube side cylindrical portion 4b.
[0049]
A reinforcing rigid ring 5 is provided on the outer peripheral surface of the tube side cylindrical portion 4b. The connecting portion 4c and the manhole side cylindrical portion 4a have an inner diameter that can secure a free space 6 in which the insertion end of the tube can be accommodated even at the maximum tube mounting angle. The flexible joint 1 has a tube side cylindrical portion 4b that freely corresponds to a tube mounting angle.
[0050]
FIG. 3 shows a longitudinal sectional view and a front view of an example of the reinforcing rigid ring 5 used in the flexible joint 1 shown in FIGS. The rigid ring according to the present invention is not limited to this example, and various shapes can be used.
[0051]
The flexible joint 11 shown in FIG. 4 has a longitudinal sectional view similar to that of the flexible joint 1 of FIGS. 1 and 2, but a reinforcing rigid ring 15 is provided on the inner peripheral side of the tube side cylindrical portion 4b. The point differs from the flexible joint 1.
[0052]
In the flexible joint 21 shown in FIG. 5, a reinforcing rigid ring 25 is provided on the inner peripheral side of the pipe-side cylindrical portion 4 b, and the bellows portion 24 d is connected to the central axis of the flexible joint 21 in the connecting portion 4 c. A free space 26 is provided which is provided in a direction perpendicular to the tube and can accommodate the insertion end of the tube. The bellows portion according to the present invention is not limited to these examples, and various shapes can be used.
[0053]
FIG. 6 is a longitudinal sectional view showing a state where the flexible joint 1 according to an example of the present invention is attached to the connection hole 2 a of the manhole 2 with the extension band 7. The tube side cylindrical portion 4b is provided with a fastening band 8 for fixing to the tube.
[0054]
FIG. 7 is a cross-sectional view showing a state in which the pipe 3 is smoothly inserted into the flexible joint 1 of FIG. 6 from the pipe-side cylindrical portion 4b to the position A on the inner peripheral surface of the manhole 2 without an attachment angle. Yes.
[0055]
FIG. 8 is a longitudinal cross-sectional view of the state where the tube 3 is inclined by the angle θ and the tube 3 is inserted in a state where the tube-side cylindrical portion 4b of the flexible joint 1 attached in FIG. It is shown in a plane view.
[0056]
As shown in FIG. 8, with respect to the displacement of the angle θ of the tube side cylindrical portion 4b, the reinforcing rigid ring 5 supports the tube side cylindrical portion 4b from the surroundings. The end 4e is not deformed.
[0057]
Moreover, in the example shown in FIG. 8, since the bellows part 4d follows a displacement, the state which can insert the pipe | tube 3 smoothly is not shown, without inhibiting the free space 6. FIG.
[0058]
FIG. 9 shows the situation when the tube 3 is inserted while being displaced in the horizontal direction at an attachment angle δ, and the tube 3 can be smoothly inserted into the tube-side cylindrical portion 4b even when the attachment angle is provided as in FIG. Indicates the situation that can be done.
[0059]
Thus, in this invention, the rigid ring provided in the inner peripheral part or outer peripheral part of the pipe side cylindrical part of a flexible joint reinforces and supports the pipe side cylindrical part. Further, in the present invention, the displacement of the tube-side tubular portion is followed by the bellows portion provided in the connecting portion, so that the tube-side tubular portion can be easily displaced according to the mounting angle while maintaining the state of the tube before displacement. It can be done.
[0060]
【The invention's effect】
According to the present invention, if a flexible joint having a predetermined rigid ring is attached to the connection hole of the manhole, it is possible even if an attachment angle is required for the pipe when the pipe is inserted into the flexible joint. The tube insertion port of the joint can be directed to the tube according to the mounting angle while keeping the tube insertion port without being deformed, and a tube mounting structure with excellent water tightness can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an example flexible joint of the present invention.
2 is a front view of the flexible joint of FIG. 1. FIG.
3A is a longitudinal sectional view showing an example of a rigid ring according to the present invention, and FIG. 3B is a front view of the rigid ring of FIG. 3A.
FIG. 4 is a partial longitudinal sectional view of another example flexible joint of the present invention.
FIG. 5 is a partial longitudinal sectional view of a flexible joint of still another example of the present invention.
FIG. 6 is a longitudinal sectional view showing one step of the pipe mounting method of an example of the present invention.
FIG. 7 is a cross-sectional view showing another process of the pipe mounting method according to an example of the present invention.
FIG. 8 is a longitudinal sectional view showing one step of a pipe mounting method according to another example of the present invention.
FIG. 9 is a cross-sectional view showing one step of another pipe mounting method of the present invention.
FIG. 10 is a longitudinal sectional view showing a state where a tube is about to be inserted into a conventional flexible joint at an attachment angle θ.
FIG. 11 is a partial longitudinal sectional view showing a state in which a conventional flexible joint is directed toward the mounting angle θ.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible joint 2 Manhole 2a Drilling part 3 Tube 4 Cylindrical flexible body 4a Manhole side cylindrical part 4b Pipe side cylindrical part 4c Connection part 4d Bellows part 4e Pipe side insertion end part 5 Rigid ring 6 Free space 7 Expansion band 8 Fastening Band 51 Conventional flexible joint

Claims (7)

When attaching a tube to a manhole via a cylindrical flexible body,
(1) a manhole side cylindrical portion fixed to the drilling portion of the manhole, a tube side cylindrical portion fixed from the outer periphery using a fastening band at the insertion end of the tube, the manhole side cylindrical portion, and the A step of preparing a cylindrical flexible body having a connecting portion connecting the tube side cylindrical portion;
(2) a step of providing a rigid ring between the fastening band and the connecting portion at least one of the inner and outer circumferential sides of the pipe-side cylindrical portion and,
(3) A tube mounting method comprising a step of inserting the tube into the tube side tubular portion while keeping the tube side tubular portion in a tubular shape.   2. The tube attachment method according to claim 1, wherein the rigid ring is provided between the fastening band and the connecting portion on the outer peripheral side of the tube side tubular portion. A flexible joint for attaching a pipe to a manhole,
A cylindrical flexible body and a rigid ring are provided.The cylindrical flexible body has a manhole side cylindrical portion fixed to a drilling portion of a manhole, and an outer periphery using a fastening band at an insertion end portion of the tube. a tube-side cylindrical portion to be fixed from the and a connecting portion that connects the manhole side tubular portion and the tube-side cylindrical portion, the rigid ring of the tube-side cylindrical portion at least one in the fastening bands and outer circumferential sides is provided between the coupling portion, when connecting the manhole and the pipe, the deformation of the tube-side cylindrical portion is prevented by said rigid ring A flexible joint characterized by 4. The flexible joint according to claim 3, wherein the tube-side tubular portion follows a mounting angle of the tube with respect to the manhole by the flexibility of the connecting portion in a state where the tube-side tubular portion is maintained in a tubular shape.   5. The flexible joint according to claim 3, wherein the manhole side cylindrical portion has an inner diameter larger than an outer diameter of an insertion end portion of the tube.   6. The flexible joint according to any one of claims 3 to 5, wherein the connecting portion has a bellows portion that follows an attachment angle of the pipe. A pipe mounting structure in which a pipe is attached to a manhole via a flexible joint,
The friendly rattan joint has a flexible tubular body and the rigid ring, said cylindrical friendly shaking body, the manhole side cylindrical portion fixed to the drilling part of the manhole, fastened to the insertion end of the tube A tube-side tubular portion fixed from the outer periphery using a band, and a connecting portion connecting the manhole-side tubular portion and the tube-side tubular portion; the inner and outer circumferential sides of at least one in the fastening band and wherein the tube is inserted into the tube-side cylindrical portion which is kept in a cylindrical shape by the rigid ring provided between the connecting portion Pipe mounting structure.

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