JP5422371B2 - Pipe fitting, joint structure and connection method of manhole pipe connection port and propulsion pipe - Google Patents

Description

  The present invention relates to a pipe joint, a joint structure, and a method for connecting a pipe connection port of a manhole and a propulsion pipe.

  Currently, for example, a pipe joint provided with a rigid cylindrical collar and a cylindrical flexible body provided inside the collar is used to connect the pipe connection port of the manhole and the propulsion pipe (Patent Document). 1). In the pipe joint described in Patent Document 1, the cylindrical flexible body is formed of an elastic body that absorbs the displacement between the collar and the propelling pipe, and at least a part of the cylindrical flexible body. Has a structure fixed to the collar.

However, when the pipe connection port of the manhole is connected to the propulsion pipe by the pipe joint described in Patent Document 1, one end of the cylindrical flexible body is fastened to the outer periphery of the propulsion pipe from the inside of the manhole by a fastening band. It is necessary to fix by crimping and to fix the outer periphery of the collar with a filler.
Therefore, when using the pipe joint of the said patent document 1, there exists a fault that the construction from the inner side of a manhole is complicated.

Japanese Patent No. 3597789

In view of this, it is conceivable to use a pipe joint in which a lip made of a flexible body is provided in a row in the axial direction on the inner periphery of the collar and to fit the propelling pipe in a watertight manner with the lip.
However, in the pipe joint, for example, when earth pressure is applied to the propulsion pipe, the propulsion pipe is displaced so that the axis of the propulsion pipe moves in parallel to the axis of the collar, With only one lip, due to this displacement of the propelling tube, it becomes impossible to sufficiently absorb the deviation of the internal stress generated at both ends in the direction of displacement of the lip. Therefore, in the lip, there is a portion where the adhesion with the outer peripheral surface of the propulsion pipe is remarkably lowered, and water leakage tends to occur at this portion, so that the pipe joint has a disadvantage that sufficient water stoppage cannot be secured. is there.

Further, when a pipe joint (see FIG. 8A) having lip portions in which two rows of lips are provided in the axial direction is used on the inner periphery of the collar, the cross section S of the lip and the axis L _{1 of the} collar 210 are used. The propulsion tube 40 is non-parallel to the axis L ₁ of the collar 210 so that the angle formed by the axis L ₂ of the propulsion tube 40 and the axis L ₁ of the collar 210 is θ, with the intersection point P as the center. In the case of the bending displacement, as shown in FIG. 8B, the propelling tube 40 is further displaced due to the difference in the repulsive force of the lip, and the bending displacement of the portion having the highest radial inner height in the lip. A difference in internal stress is easily generated between the direction end C and the bending displacement direction end D, and water leakage is likely to occur.

  The present invention has been made in view of such circumstances, and it is easy to construct from the inside of a manhole, and even when the propulsion pipe is bent and displaced, it is possible to ensure excellent water stoppage. It is an object of the present invention to provide a joint, a joint structure, and a method for connecting a pipe connection port of a manhole and a propulsion pipe.

  The pipe joint of the present invention is a pipe joint that is inserted into a pipe connection port of a manhole and connects a propulsion pipe to the pipe connection port, and is partially formed on a cylindrical collar and one end side in the axial direction of the collar. A joint main body made of an annular flexible body inserted therein, and a lip part integrally formed on the inner periphery of the joint main body and watertightly fitting the propelling pipe, When the propulsion tube is bent and displaced so as to be non-parallel to the axis of the collar, centering on the intersection of the cross section of the lip and the axis of the collar, at both ends of the lip in the bending displacement direction It is characterized by comprising a plurality of lips that make the generated internal stress substantially uniform.

In the pipe joint of the present invention, since the lip portion is formed integrally with the inner periphery of the joint main body, the propelling pipe is inserted into the joint main body, so that the propelling pipe is watertight by the lip portion. Is fitted internally.
Therefore, according to the pipe joint of the present invention, construction can be easily performed from the inside of the manhole when the pipe connection port of the manhole and the propulsion pipe are connected.
Further, in the pipe joint of the present invention, the propulsion pipe is bent and displaced so that the lip portion is not parallel to the axis of the collar around the intersection of the cross section of the lip and the axis of the collar. When this is done, the internal stress generated at both ends of the lip portion in the bending displacement direction is made substantially uniform. Thereby, since the movement to the radial direction of the said propulsion pipe can be suppressed, water leakage can be prevented.
Therefore, according to the pipe joint of the present invention, excellent water stoppage can be ensured.

In the pipe joint of the present invention, the lip portion includes a first lip formed on the inner peripheral side of the joint body, and one or more rows of first lips formed on both axial ends of the first lip. The propulsion tube is bent and displaced by three or more rows of lips in the axial direction including two lips, and the first lip is formed to have a higher radial height than the second lip. In this case, the propulsion tube can be supported by the second lip in addition to the first lip.
According to the pipe joint adopting such a configuration, since the propulsion pipe can be fixed so as not to move in the radial direction of the propulsion pipe, it is possible to effectively ensure water stoppage when the propulsion pipe is bent and displaced. Can do.

In the pipe joint according to the aspect of the invention, it is preferable that the first and second lips are formed forward in the insertion direction of the propulsion pipe.
Thereby, when the propulsion pipe is inserted into the joint main body, each lip is easily inclined and deformed along the traveling direction of the propulsion pipe. Therefore, according to the pipe joint adopting such a configuration, the friction generated between the lip portion and the propulsion pipe can be reduced, so that the construction becomes easy.

In the pipe joint of the present invention, it is preferable that a flange portion having a diameter larger than the outer diameter of the collar is formed on the outer peripheral surface of the joint body on the side where the propulsion pipe is inserted.
In this case, the flange portion is fixed so that the collar does not move excessively toward the side of the joint body where the propulsion pipe is inserted. It can prevent entering inside.

The joint structure of the present invention is a joint structure for connecting a propulsion pipe to a pipe connection port of a manhole by the pipe joint described above,
The pipe joint is inserted into the pipe connection port, and the propulsion pipe is fitted in a watertight manner,
A space between the inner peripheral surface of the pipe connection port and the outer peripheral surface of the collar of the pipe joint is sealed with a filler.
Since the pipe joint of the present invention is used in the joint structure of the present invention, the same effects as the above-described pipe joint are exhibited.

The method for connecting a manhole pipe connection port and a propulsion pipe according to the present invention includes the following steps (a) to (c).
(A) a step of arranging one end of the propulsion pipe in the pipe connection port;
(B) a step of inserting the above-described pipe joint into the pipe connection port, and fitting the propelling pipe into the pipe joint in a watertight manner; and (c) an inner peripheral surface of the pipe connection port and the pipe joint. The step of filling the filler between the outer peripheral surface of the collar The method for connecting the pipe connection port of the manhole of the present invention and the propulsion pipe uses the pipe joint of the present invention, so the same effect as the above-mentioned pipe joint is obtained. Played.

  According to the pipe joint of the present invention, the joint structure, and the method of connecting the manhole pipe connection port and the propulsion pipe, construction from the inside of the manhole is easy, and even if the propulsion pipe is bent and displaced, an excellent stoppage is obtained. Aqueous property can be secured.

It is a partial cross section side view which shows the structure of the joint structure which concerns on one embodiment of this invention. It is a partial cross section side view which shows the structure of the pipe joint which concerns on one embodiment of this invention. It is principal part sectional drawing explaining the outline of a propulsion construction method. It is principal part sectional drawing which shows the outline of the introduction process of the propulsion pipe to the manhole in a propulsion construction method. It is principal part sectional drawing explaining the outline of the connection method of the piping connection port of a manhole and propulsion pipe which concerns on one embodiment of this invention. It is a partial cross section side view which shows the structure of the joint structure which concerns on the modification of this invention. It is a schematic explanatory drawing which shows stress distribution when a propulsion pipe carries out bending displacement in the joint structure which concerns on this Embodiment. It is a schematic explanatory drawing which shows stress distribution when a propulsion pipe is bent and displaced in the joint structure using the pipe joint which concerns on a comparative example.

[Pipe joints and joint structures]
Hereinafter, an embodiment of each of the pipe joint and the joint structure of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional side view showing a configuration of a joint structure according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional side view showing the configuration of the pipe joint according to the embodiment of the present invention.

In the joint structure 1 of the present embodiment, as shown in FIG. 1, the propulsion pipe 40 is watertight by the lip portion 21 of the joint body 20 of the pipe joint 2 disposed in the pipe connection port 31 of the manhole 30. In addition to being fitted, the space between the inner peripheral surface 31 a of the pipe connection port 31 and the outer peripheral surface 10 a of the collar 10 of the pipe joint 2 is sealed in a watertight manner by the filler 60.
In this joint structure 1, an annular leakage preventing material 50 is attached to the outer peripheral side of the pipe joint 2. Thereby, the leakage of the filler 60 to the outer side of the manhole 30 is prevented.

  As shown in FIG. 2, the pipe joint 2 is integrally formed with a cylindrical collar 10, a joint body 20 partially inserted on one end side in the axial direction of the collar 10, and an inner periphery of the joint body 20. And a lip portion 22 formed on the surface.

  The collar 10 is made of steel. An annular seal portion 11 made of water-swellable rubber is integrally formed on the outer peripheral side of the collar 10, and water leakage is suppressed by absorbing and expanding water.

The joint body 20 is made of an annular flexible body made of ethylene-propylene-diene rubber.
One end of the joint body 20 in the axial direction is an insertion port 21 into which the propulsion pipe 40 is inserted. A lip 22 is integrally formed on the inner periphery of the joint body 20 on the insertion port 21 side. The joint body 20 has a flange portion 27 having a diameter larger than the outer diameter of the collar 10 on the outer peripheral surface on the insertion port 21 side.

The lip portion 22 includes lips 23, 24, 25, and 26 formed in four rows in the axial direction.
Among these lips 23, 24, 25, and 26, the radial inner height of the lip 24 is higher than the lips 23, 25, and 26 at both axial ends of the lip 24. Thereby, the lip 24 and the outer peripheral surface of the propulsion pipe 40 can be brought into close contact with each other with a higher contact pressure than the other lips 23, 25, 26, and water can be stopped.
In the lip portion 22, when the propulsion pipe 40 is bent and displaced in the joint structure 1, the lip portion 22 has the highest radial inner height, and the lip portion 22, the lip portion 22, the lip portion 22, and the lip portion 22. The propulsion pipe is supported. As a result, the propulsion tube 40 is fixed so as not to move in the radial direction, so that water stoppage is ensured when the propulsion tube 40 is bent and displaced.
In the present specification, the bending displacement of the propulsion tube 40 is centered on the intersection P between the cross section S passing through the lip 24 having the highest radial inner height of the lip portion 22 and the axis L ₁ of the collar 10. The axis of the propulsion tube 40 and the axis of the collar 10 form an angle θ, and the propulsion tube 40 is displaced so as not to be parallel to the axis of the collar 10 (see FIG. 7B). .

  The lips 23, 24, 25, and 26 are formed toward the front in the insertion direction of the propulsion pipe 40. Therefore, when the propulsion pipe 40 is inserted into the joint body 20, each lip 23, 24, 25, 26 is easily inclined and deformed along the traveling direction of the propulsion pipe 40. Thereby, the friction which arises between the lip | rip part 22 and the propulsion pipe 40 can be reduced. Therefore, since the propulsion pipe 40 can be easily inserted into the joint body 20, it can be easily constructed.

The flange portion 27 is fixed so that the collar 10 does not move excessively toward the side where the propulsion tube 40 is inserted. Thereby, it is possible to prevent the joint body 20 from excessively entering the inside of the collar 10 as the propulsion pipe 40 is inserted.
Further, the flange portion 27 fixes the leakage preventing material 50 so as not to move toward the outside of the manhole 30 in the joint structure 1.

[How to connect the manhole piping connection port to the propulsion tube]
Hereinafter, with reference to the accompanying drawings, a method for connecting a pipe connection port of a manhole and a propulsion pipe according to an embodiment of the present invention using the pipe joint 2 will be described in detail. Explain the benefits. The connection method according to the present embodiment can be employed for connection between a manhole pipe connection port and a propulsion pipe in the propulsion method.

In this propulsion method, as shown in FIG. 3, first, a vertical shaft 100 extending in the vertical direction is excavated in advance to a manhole planned position, and then a cylindrical block that becomes the manhole 30 is suspended from above the vertical shaft 100 one after another. Install it. In the lowermost block, for example, a circular pipe connection port 31 for loose insertion of the propulsion pipe 40 is opened to the left and right, and the propulsion pipe is connected to the pipe connection port 31 as shown in FIG. 40 is connected.
In this case, in order to form the shaft 100 on the ground, a steel pipe press-fitting method using a steel pipe casing 35 as a temporary earth retaining member can be employed. This steel pipe press-fitting method is a method in which a casing 35 made of a cylindrical steel pipe is press-fitted into the ground by a press-fitting machine, and this is excavated by a backhoe 101 or the like as shown in FIG. . For example, a steel pipe having a nominal diameter of 1200 mm is used for the casing 35, and the bottom 100a of the shaft 100 is made into a bottom concrete layer by placing concrete.

  Next, a connection method according to an embodiment of the present invention for connecting the propulsion pipe 40 to the pipe connection port 31 of the manhole 30 using the pipe joint 2 will be described. FIG. 5 is a cross-sectional view of an essential part for explaining an outline of a method for connecting a pipe connection port of a manhole and a propulsion pipe according to an embodiment of the present invention.

  First, the propelling pipe 40 propelled from the outside of the manhole 30 is inserted into the pipe connection port 31 of the manhole 30 (see FIGS. 5A and 5B). Thereby, the propulsion pipe 40 is disposed in the pipe connection port 31.

And the pipe joint 2 is arrange | positioned in the pipe connection port 31 from the inner side of the manhole 30, and the propulsion pipe 40 is fitted by the lip | rip part 22 of this pipe joint 2 (refer FIG.5 (c)).
Thereby, since the lip | rip part 22 of the coupling main body 20 of the pipe joint 2 and the outer peripheral surface 40a of the propulsion pipe 40 closely_contact | adhere, a high water stoppage can be ensured.

Thereafter, the leakage preventing material 50 is attached to the outer peripheral side of the pipe joint 2, and then the filler 60 is filled between the inner peripheral surface 31 a of the pipe connection port 31 of the manhole 30 and the outer peripheral surface of the pipe joint 2 (FIG. 5). (See (d)). Thereby, the piping connection port 31 of the manhole 30 and the propulsion pipe 40 can be reliably connected.
At this time, the leakage preventing member 50 is fixed so as not to move toward the outer side of the manhole when the one end portion 50a outside the manhole comes into contact with the side surface 27a of the flange portion 27.

[Modification]
In the present invention, the collar 10 can be made of a stainless steel material such as SUS304, a rolled steel material for welded structure, or a rolled steel material for general structure. The collar 10 may be made of fiber reinforced plastic or the like as long as the strength can be maintained instead of the steel material.
As the water-swellable rubber, styrene butadiene rubber, isoprene rubber, or the like can be used.
An elastomer such as ethylene-propylene-diene rubber or styrene-butadiene rubber can be used as the flexible material constituting the joint body 20.

In the present invention, as the leakage preventing material 50, for example, an annular sponge made of polyurethane foam can be used. In the present invention, instead of the leakage preventing material 50 shown in FIG. 1, a leakage preventing material 55 having a hollow cross-sectional shape shown in FIG. 6 may be used.
As the filler 60, mortar or the like can be used.

[Verification of effects of pipe joints]
Below, based on an accompanying drawing, the operation effect of the pipe joint concerning this embodiment is explained in detail.
In the case where the propulsion pipe is bent and displaced in the joint structure, the joint structure 1 according to the present embodiment (see FIG. 7) and a joint having a lip portion including two lips 221 and 222 that are fewer than those of the present embodiment. A joint structure 201 (see FIG. 8) using a pipe joint 202 provided with a main body 220 is compared. In the joint structure 201, the lip 222 is formed so that the radially inner height is higher than that of the lip 221.

In the joint structure 1 according to the present embodiment, as the axis L ₂ of the propulsion tube 40 are coaxial and the axis L ₁ of the pipe joint 2, when the propulsion tube 40 is disposed, the lip portion 22 The stress distributions S _A and S _B on the upper end A side and the lower end B side are distributed symmetrically about the axis L ₁ (L ₂ ), and the upper end A side and the lower end B side of the lip portion 22 There is no bias of internal stress (see FIG. 7A). The internal stress generated in the lip 24 having the highest radial inner height is uniform over the circumferential direction (see FIG. 7A).

Then, 30 outer end manhole propulsion tube 40, inclination upward in FIG. 7 (b), the around the intersection P of the axis L ₁ of the cross-section S and the collar 10 through the lip 24 of the lip portion 22, when promoting pipe 40 such that the axis L ₁ and the axis L ₂ of the propulsion tube 40 is non-parallel to the axis L ₁ of the collar at an angle θ of the collar 10 is bent displacement bent at the lip portion 22 The total stress applied on the upper side (A side in the figure) in the displacement direction (arrow direction in FIG. 7B) is larger than the total stress applied on the lower side (B side in the figure) in the bending displacement direction. However, the total stress applied to the bending displacement direction upper side of the lip portion 22 can be distributed to the lip 23, 24, 25, and the internal stress [Delta] S _A generated in the bending displacement direction end portion 24a of the lip 24, the lip the internal stress [Delta] S _B generated in bending displacement direction end portion 24b of 24, has a substantially uniform. Thereby, it is possible to prevent the propulsion pipe 40 from further moving in the radial direction.
Therefore, according to the pipe joint 2 which concerns on this Embodiment, even if it is a case where the propulsion pipe 40 bends and displaces in the joint structure 1, water stoppage can be ensured.
The bending displacement direction end portions 24a and 24b have a cross section S passing through the lip 24, which is the portion having the highest radial inner height of the lip portion 22, and a method of the cross section S passing through the center of the cross section S. line which is both ends of the line of intersection between a longitudinal plane including the axis L ₂ of the propulsion tube 40 (the axis L ₁ of the collar 10).

On the other hand, the joint structure 201, when the axis L ₂ of the propulsion tube 40 is located coaxially with the axis L ₁ of the pipe joint 202, stress distribution S _C at the upper side C and lower side D of the lip portion 220, S _D Has a line-symmetric distribution shape with respect to the axis L ₁ . The internal stress generated in the lip 222 having the highest radial inner height is uniform over the circumferential direction (see FIG. 8A).

However, the outer portion of the manhole 30 of the propulsion tube 40 is inclined upward in FIG. 8B, and the transverse section S and the axis L _{1 of the} collar 210 at the portion having the highest radial inner height in the lip portion 222. around the intersection P, it forms an axis L ₂ and the angle of the axis L ₁ and the propulsion pipe 40 of the collar 210 theta, propulsion tube 40 so as to be non-parallel to the axis L ₁ of the collar 210 is bent When displaced, the lip 221, 222 of the lip portion of the pipe joint 202 cannot sufficiently disperse the stress. Therefore, the internal stress [Delta] S _C generated on the cutting edge portion of the bending displacement direction end portion 222a of the lip 222, a difference between the internal stress [Delta] S _D occurring in the bending displacement direction end portion 222b of the leading end of the lip 222 is caused. At this time, the bending displacement direction end portion 222a, with the bias of the internal stress between 222b, propulsion tube 40, on the vertical plane containing the axis L ₂ of the axis L ₁ and the propulsion tube 40 of collar 210 Furthermore misalignment (see L ₃₎ (FIG. 8 (c)).
As a result, a difference occurs between the adhesion between the bending displacement direction end portion 222a and the outer peripheral surface 40a of the propulsion tube 40 and the adhesion between the bending displacement direction end portion 222b and the outer peripheral surface 40a of the propulsion tube 40. It becomes easy to invite.
Therefore, in the pipe joint 202, when the propulsion pipe 40 is bent and displaced in the joint structure 201, it is not possible to ensure sufficient water-stopping.

  As described above, the pipe joint 2 according to the present embodiment is excellent in that a higher water stoppage can be ensured than the pipe joint 202 even when the propulsion pipe 40 is bent and displaced.

  1 joint structure, 2 pipe joint, 10 collar, 10a outer peripheral surface, 20 joint body, 22 lip portion, 23, 25, 26 lip (second lip), 24 lip (first lip), 24a bending displacement direction end Part, 24b bending displacement direction end, 30 manhole, 31 piping connection port, 31a inner peripheral surface, 40 propulsion pipe, 50 leakage prevention material, 60 filler, P intersection, S cross section

Claims (5)

A pipe joint that is inserted into the pipe connection port of the manhole and connects the propulsion pipe to this pipe connection port.
With a tubular collar,
A joint body made of an annular flexible body partially inserted into one end of the collar in the axial direction;
A lip portion that is integrally formed on the inner periphery of the joint body and that fits the propelling pipe in a watertight manner;
The lip portion is
A first lip formed on the inner peripheral side of the joint body;
It comprises three or more rows of lips in the axial direction including one or a plurality of rows of second lips respectively formed on both ends in the axial direction of the first lip,
When the propulsion tube is bent and displaced so that the first and second lips are not parallel to the collar axis about the intersection of the cross-section of the lip portion and the collar axis. The internal stress generated at both ends of the lip portion in the bending displacement direction is substantially equalized .
The front ends of the first and second lips are in contact with the outer peripheral surface of the propulsion pipe,
The first lip has a higher radial height than the second lip.
Pipe fittings. The pipe joint according to claim 1 , wherein the first and second lips are formed toward the front in the insertion direction of the propulsion pipe. The pipe joint according to claim 1 or 2 , wherein a flange portion having a diameter larger than an outer diameter of the collar is formed on an outer peripheral surface of the joint body on a side where the propulsion pipe is inserted. A joint structure for connecting a propulsion pipe to a pipe connection port of a manhole by the pipe joint according to any one of claims 1 to 3 ,
The pipe joint is inserted into the pipe connection port, and the propulsion pipe is fitted in a watertight manner,
A joint structure characterized in that a space between the inner peripheral surface of the pipe connection port and the outer peripheral surface of the collar of the pipe joint is sealed with a filler. A method for connecting a manhole pipe connection port and a propulsion pipe, including the following steps (a) to (c).
(A) a step of arranging one end of the propulsion pipe in the pipe connection port;
(B) a step of inserting the pipe joint according to any one of claims 1 to 3 into the pipe connection port, and fitting the propelling pipe into the pipe joint in a watertight manner; and (c) the pipe connection port. Filling a filler between the inner peripheral surface of the tube and the outer peripheral surface of the collar of the pipe joint

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