JP4620385B2 - Propulsion pipe joint structure and pipe connection port and propulsion pipe connection method - Google Patents

Description

  The present invention relates to a joint structure using a flexible sealing member between a pipe connection port of a manhole and a propulsion pipe in a propulsion method, and a connection method thereof.

Conventionally, as a joint structure for easily connecting the manhole pipe connection port and the propulsion pipe, a short pipe is inserted into the manhole pipe connection port, and this short pipe is connected to the propulsion pipe via a sleeve joint of a required length. There is one in which a flexible seal member is attached between the short pipe and the pipe connection port (see, for example, Patent Document 1).
In addition, as a joint structure that facilitates connection work by adjusting the connection angle of the propulsion pipe to the pipe connection port, the flange of the seal member is fixed to the manhole side wall with an adhesive, and the inside of the cylindrical portion of the seal member A separate sleeve is inserted, and a tube (propulsion tube) is inserted inside the sleeve to connect the tube to the side wall of the manhole so as to be stretchable (for example, see Patent Document 2). .)

JP 2001-165382 A Japanese Patent No. 3354218

  However, in the joint structure described in Patent Document 1, the short pipe to which the flexible seal member is fixed and the propulsion pipe are connected via a separate sleeve, so that the construction work becomes complicated, and further, The sleeve is placed in the gap between the casing and the manhole side wall, so if the gap is narrow, such as when constructing a small-diameter sewer pipe, the length of the sleeve cannot be secured and the propulsion pipe and There is a disadvantage that the connection cannot be made.

  Further, in the joint structure described in Patent Document 2, since the flange of the seal member is fixed to the outside of the manhole side wall, it is very difficult to connect from the inside of the manhole. In addition, since the ring-shaped gap formed by the seal member, the sleeve, and the pipe connection port is filled with mortar, etc., the flexibility of the seal member is reduced, and the propulsion pipe is displaced due to an earthquake or the like. If force is applied, intrusion water may occur due to damage to the connection.

  Therefore, in view of such a conventional problem, the present invention provides a joint structure that can ensure the flexibility of the connecting portion and can easily and reliably connect the propelling pipe from the inside of the manhole, and a connection method thereof. For the purpose.

In order to achieve the above object, the present invention takes the following technical means.
That is, the present invention is a joint structure for connecting a propulsion pipe to a pipe connection port of a manhole, and is inserted into the pipe connection port from the inside of the manhole so as to be coaxially connected to an end portion of the propulsion pipe. The non-flexible short tube sleeve having a substantially cylindrical short tube sleeve that fits and closely contacts and an outer lip portion that is expanded radially outward by a diameter expanding member and is fixed to the inner surface of the pipe connection port. A flexible annular seal member fixed in advance to the outer peripheral surface of the pipe and an axial fit of the short pipe sleeve to the propulsion pipe so that the outer lip portion is within the thickness range of the pipe connection port. regulating the case, that it and a positioning means consisting of axially outer end of the short pipe sleeve to be abutment with the inner surface of the stepped portion or the manhole outside are formed in the short pipe sleeve casing And features.

In this case, a non-flexible substantially cylindrical short tube sleeve inserted into the pipe connection port from the inside of the manhole is brought into close contact with the end of the propulsion tube, and has flexibility between the short tube sleeve and the pipe connection port. Since the annular seal member is interposed and sealed between them, the connection part of the propulsion pipe and the pipe connection port has a compact configuration with an integrated seal member and a short pipe sleeve, and connection work from the inside of the manhole is possible. It becomes simple.
Further, it is not necessary to perform the connection work from the outside of the manhole side wall. Even when the gap between the manhole side wall and the outer member (for example, steel pipe casing for earth retaining) is narrow, It is securely connected to the manhole side wall through the seal member.

  In addition, unlike Patent Document 2, it is not necessary to fill the gap between the pipe connection port and the short tube sleeve with mortar or the like, so that the flexibility of the connection part is maintained and the propulsion pipe is displaced with respect to the pipe connection port. However, the sealing property of the pipe connection port is ensured.

In the joint structure described above, the propelling tube and the short tube sleeve may be in close contact with a waterproof adhesive. For example, an annular rubber packing is attached to the inner peripheral surface of the short tube sleeve, and the short tube More preferably, the space between the tube sleeve and the propulsion tube is sealed with the rubber packing.
In this case, since it is not necessary to apply an adhesive, the connection work becomes easier. Moreover, what is necessary is just to divert a commercially available rubber ring receptacle tube to a short tube sleeve, in order to hold down cost more.

Moreover, 2nd this invention is a connection method of the pipe connection port of a manhole and a propulsion pipe including the following process (a)-(c).
(A) Inserting a non-flexible substantially cylindrical short tube sleeve in which the inner end of a flexible annular sealing member is fixed to the outer peripheral surface into the pipe connection port from the inside of the manhole 1st process which arrange | positions a sealing member in the said piping connection port

(B) Axial fitting to the propulsion pipe is restricted by the axially outer end of the short pipe sleeve that is a step portion formed on the short pipe sleeve or an abutting portion with respect to the inner surface of the casing outside the manhole. Until the end of the propulsion pipe is coaxially fitted and closely attached to the end of the short pipe sleeve (c) the position within the thickness range of the pipe connection port due to the fitting restriction The outer lip portion of the annular seal member is expanded radially outward by a diameter expanding member and fixed to the inner surface of the pipe connection port, and the pipe connection port and the short tube sleeve are fixed by the annular seal member. Third step to seal the gap

In this case, the flexible annular seal member is fixed to the outside of the non-flexible short tube sleeve and then passed through the pipe connection port, and the annular seal member is disposed in the pipe connection port. Since the pipe sleeve is inserted into the end of the propelling pipe and brought into close contact, and the connection between the pipe connection port and the short pipe sleeve is sealed with the seal member, the operator can integrate the seal member and the short pipe sleeve. In this state, connection work from the inside of the manhole can be performed.
As a result, the connection work becomes extremely simple. In addition, since it is not necessary to perform the connection work from the outside of the manhole side wall, the propulsion pipe is securely connected to the manhole side wall via the short tube sleeve and the seal member even when the gap between the manhole side wall and the outer member is narrow. Connected to.

  As described above, according to the present invention, since the short tube sleeve and the seal member can be connected together, the gap between the pipe connection port and the short tube sleeve is not filled with mortar or the like. While ensuring the flexibility of the connecting portion, the propulsion tube can be easily and reliably connected from the inside of the manhole.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 and FIG. 2 are cross-sectional views of relevant parts for explaining the outline of a construction method that employs the joint structure 1 of the manhole 30 and the propulsion pipe 40.
The joint structure 1 according to the present invention is employed in a connection portion between a sewer pipe (propulsion pipe 40) constructed by a small-diameter propulsion method and a pipe connection port 31 of a manhole 30 in particular. The manhole 30 constructed in the present embodiment is an existing facility such as various communication cables embedded for the purpose of excavating a hole as small as possible in a construction site such as an urban area and installing it in a short period of time. It is constructed by the construction method that enables the coexistence of

A sewage pipe (vinyl chloride pipe) having a small diameter (for example, a pipe diameter of about 150 to 350 mm) is used in a large proportion, and the small-diameter propulsion method is most often used to construct the sewage pipe in the ground. In this small-diameter propulsion method, as shown in FIG. 1, first, a vertical shaft called a vertical shaft 100 is excavated in advance at a planned manhole position, and then a cylindrical block that becomes the manhole 30 is suspended from above the vertical shaft 100. One after another is installed.
In the lowermost block, for example, a circularly cut pipe connection port 31 for loosely inserting the propulsion pipe 40 is opened to the left and right, and as shown in FIG. 40 is connected.

In this case, in order to form the shaft 100 on the ground, a steel pipe press-in method using a steel pipe casing 35 as a temporary earth retaining member is employed. This steel pipe press-fitting method is a method in which a cylindrical steel pipe casing 35 (hereinafter referred to as a casing) is press-fitted into the ground by a press-fitting machine, and the earth and sand inside thereof is excavated by a backhoe 101 as shown in FIG. It is a method to do.
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. According to this construction method, even if the sewage pipe is constructed on the ground below the part where the groundwater communicates, there is no need for ground improvement and it is suitable for work in a limited space in urban areas.

The gap S between the manhole 30 and the casing 35 installed in this way is, for example, only about 80 mm and is very narrow.
The reason why the gap S is narrow is that, first, it is necessary to use the casing 35 having the smallest possible diameter in order to build the shaft 100 in the limited space in the urban area, as described above. Secondly, if the gap S is narrowed, it is economical because the amount of backfill material used is reduced. Third, the manhole according to the present embodiment is not on-site but has already been shortened to shorten the construction period. By using a manhole as a molded secondary product, there is no need for curing.

However, while having such a merit, since the gap S is narrow, it is very difficult to work from there.
In such a case, the joint structure 1 of the present embodiment is configured such that the pipe connection port 31 and the propulsion pipe 40 can be connected from the inside of the manhole 30.

As shown in FIG. 3, the propulsion pipe end 40 </ b> A protruding from a casing 35 previously installed in the ground is connected to the pipe connection port 31 of the manhole side wall 32 via the short pipe sleeve 2 and the seal member 3. ing.
As shown in FIG. 4, the short tube sleeve 2 has a cylindrical shape in which one end portion 2 a (right side in the drawing) is expanded in diameter, and its length can be inserted from the pipe connection port 31 by the operator, and As shown in FIG. 3, it has been cut in advance to such a size that it can be installed inside the casing 35.

This short tube sleeve 2 is produced by cutting a commercially available polyvinyl chloride tube and enlarging the diameter of one end portion 2a to form an enlarged diameter portion 2A. Thus, unlike the annular seal member 3 made of a flexible rubber material, the short tube sleeve 2 is made of an inflexible tube member.
A stepped portion 8 formed by the enlarged diameter portion 2 </ b> A is formed at a substantially central portion of the short tube sleeve 2. In the case of forming the enlarged diameter portion 2A in the short tube sleeve 2, for example, another cylindrical member having the diameter of the enlarged diameter portion 2A is prepared, and the short tube sleeve 2 heated to a predetermined temperature is provided in the middle portion. Just press fit.

As shown in FIG. 3, the diameter-expanded portion 2A of the short tube sleeve 2 is externally fitted to the propulsion tube end portion 40A, and the short tube sleeve 2 extends to the depth where the end surface of the propulsion tube 40 abuts against the stepped portion 8. The portion 40A is fitted. That is, the step portion 8 functions as a positioning means for restricting the axial fitting of the short tube sleeve 2 to the propulsion tube 40.
The inner peripheral surface 5 of the short tube sleeve 2 (expanded diameter portion 2A) and the outer peripheral surface 40a of the propulsion tube 40 are connected in a state of being in close contact with an adhesive 9 having water resistance so that water and the like do not enter. ing. In addition, you may make it employ | adopt the elastic adhesive agent which has elasticity, and to absorb the force which generate | occur | produces between the short tube sleeve 2 and the propulsion tube 40 with this elastic adhesive agent.

As shown in FIG. 3, the seal member 3 has an annular shape, and further includes an inner lip portion 3 </ b> A that contacts the outer peripheral surface 4 of the short tube sleeve 2, and an outer lip portion 3 </ b> B that contacts the inner surface 31 a of the pipe connection port 31. Is provided. As shown in the figure, the seal member 3 is formed so as to be narrowed from the outer lip 3B to the inner lip 3A.
Since both the lip portions 3A and 3B are provided, it is convenient when the seal member 3 is temporarily fixed to the short tube sleeve 2 or the like for positioning. Note that various rubber materials having flexibility are used for the seal member 3, and among them, EPDM is particularly preferable.

Further, a diameter reducing member 6 for reducing the inner lip portion 3A in the radially inward direction and a diameter expanding member 7 for expanding the outer lip portion 3B in the radially outward direction are attached to the seal member 3.
The diameter-reducing member 6 is a steel band plate ring, to which a metal fitting (not shown) that can be freely adjusted in diameter is attached. Similarly, the diameter-expanding member 7 is also a band plate ring, and a metal fitting that can be adjusted to increase the diameter is attached. The strip ring is particularly preferably made of stainless steel having excellent corrosion resistance.

In this way, both the lip portions 3 </ b> A and 3 </ b> B of the seal member 3 are crimped and fixed to the outer peripheral surface 4 of the short tube sleeve 2 and the inner surface 31 a of the pipe connection port 31. The space between the pipe connection port 31 and the short tube sleeve 2 is sealed by the seal member 3, and the seal member 3 closes the pipe connection port 31. Thereby, the piping connection port 31 and the propulsion pipe 40 are reliably connected.
The dimension for projecting the propulsion pipe 40 to the inside of the casing 35 is determined in advance from the relationship between the width of the enlarged diameter portion 2 </ b> A of the short pipe sleeve 2 and the width of the seal member 3.

  As described above, the short pipe sleeve 2 integrally provided with the seal member 3 is externally fitted to the propulsion pipe 40 through the pipe connection port 31 and is brought into close contact with the adhesive, and the seal member 3 is connected to the pipe connection port. Since the space between the sleeve 31 and the short tube sleeve 2 is sealed, the connecting portion has a compact configuration with the seal member 3 and the short tube sleeve 2. Thereby, the connection operation from the inside of the manhole 30 is simplified.

Further, it is not necessary to perform the connection work from the outside of the manhole side wall 32, and the propulsion tube 40 is interposed via the short tube sleeve 2 and the seal member 3 even when the gap S between the manhole side wall 32 and the casing 35 is narrow. It is securely connected to the manhole side wall 32.
Further, since it is not necessary to fill the gap between the pipe connection port 31 and the short tube sleeve 2 with mortar or the like, the flexibility of the connection portion is maintained, and the propulsion pipe 40 is displaced with respect to the pipe connection port 31. The sealing property of the pipe connection port 31 is ensured.
Furthermore, since the short pipe sleeve 2 can be diverted from a general polyvinyl chloride pipe, a commercially available product can be used for the seal member 3, so that it can be constructed at a very low cost.

Next, a connection method according to the present invention for connecting the propulsion pipe 40 to the pipe connection port 31 of the manhole 30 using the seal member 3 and the short pipe sleeve 2 will be described.
First, the inner lip portion 3 </ b> A of the seal member 3 is fitted into the enlarged diameter portion 2 </ b> A of the short tube sleeve 2. Then, the reduced diameter member 6 is attached to the inner lip portion, and the seal member 3 is fixed to the short tube sleeve 2 so as to be integrated.

Next, the adhesive 9 was applied to the inner peripheral surface 5 of the enlarged diameter portion 2A of the short tube sleeve 2, and after drying this for a required time, the enlarged diameter portion 2A was protruded from the casing 35 to a predetermined position. These are fitted on the propelling tube end 40A so as to be in close contact with each other. At this time, the end surface of the propulsion pipe 40 abuts on the stepped portion 8 of the short tube sleeve 2, and the outer lip 3 </ b> B falls within the thickness range of the pipe connection port 31 (thickness range of the manhole side wall 32). The short tube sleeve 2 is inserted until it reaches the mounting position.
Subsequently, the outer lip 3 </ b> B of the seal member 3 is brought into contact with the inner surface 31 a of the pipe connection port 31, the diameter expanding member 7 is attached to the outer lip 3 </ b> B, and the seal member 3 is fixed to the pipe connection port 31.

For finishing, an excessive portion of the short tube sleeve 2 protruding to the inside of the manhole 30 is cut in accordance with the manhole side wall 32.
Thereafter, although not shown, a sponge-like O-ring is fitted in the gap between the pipe connection port 31 and the short tube sleeve 2 and the inner surface of the manhole 30 is mortared to complete the connection between the propulsion pipe 40 and the pipe connection port 31. To do.

Since the seal member 3 is fixed to the short tube sleeve 2 in advance by the connection method described above, the seal member 3 can be externally fitted to the propelling tube end portion 40A through the pipe connection port 31. Connection work from the inside of the manhole 30 can be performed in a state where the sleeve 2 is integrated. As a result, the connection work becomes extremely simple.
Further, since it is not necessary to perform the connection work from the outside of the manhole side wall 32, the propulsion pipe 40 connects the short tube sleeve 2 and the seal member 3 even when the gap S between the manhole side wall 32 and the casing 35 is narrow. And securely connected to the manhole side wall 32.

FIG. 5 is a cross-sectional view showing a second embodiment according to the present invention. The present embodiment is different from the first embodiment in that an annular rubber packing 11 is mounted on the inner peripheral surface 10a of the short tube sleeve 10, and the short tube sleeve 10 and the propelling tube 40 are connected to the rubber packing 11. It is the point which is closely_contact | adhered via.
As shown in FIG. 6, the short tube sleeve 10 has a cylindrical shape, and an annular groove 12 that swells from the inner periphery toward the radially outer side is formed near one end portion thereof. A rubber packing 11 is mounted in the annular groove 12 in advance, and the cross-sectional dimension of the rubber packing 11 is slightly larger than the cross-sectional dimension of the annular groove 12.

As shown in FIG. 5, the short tube sleeve 10 is externally fitted to the propulsion tube end portion 40 </ b> A until its axial outer end abuts against the inner surface of the casing 35. The space between the inner peripheral surface 10a and the outer peripheral surface 40a of the propulsion pipe end 40A is sealed.
Therefore, in the case of the second embodiment, the axially outer end of the short tube sleeve 10 constitutes a positioning means for restricting the fitting of the short tube sleeve 10 to the propulsion tube 40 in the axial direction. The position of the inner lip 3 </ b> A of the seal member 3 is closer to the manhole 30 than the annular groove 12.

Other configurations are substantially the same as those in the first embodiment. Thus, since the connection between the propulsion tube 40 and the short tube sleeve 10 is made by the rubber packing 11, it is not necessary to apply the adhesive 9 as in the first embodiment, and the connection work is easy.
Moreover, since the short tube sleeve 10 used by this embodiment can divert a commercially available rubber ring receiving joint, cost can be suppressed more. In the present embodiment, the short tube sleeve 10 may be provided with a step portion 8 so that the end surface of the propulsion tube 40 abuts against the step portion 8.

  The above-described embodiments are all illustrative and not restrictive. For example, as shown in FIGS. 7A and 7B, the position of the annular groove 12 formed in the short tube sleeve 10 (that is, the position where the rubber packing 11 is mounted) may be changed. In FIG. 7A, the annular groove 12 is formed substantially at the center of the short tube sleeve 10, and the fixing position of the inner lip 3 </ b> A of the seal member 3 is closer to the casing 35 than the annular groove 12. .

7B, the annular groove 12 is accommodated within the thickness of the short tube sleeve 10, and the inner lip 3A is fixed at the same position as the position where the annular groove 12 is formed.
In addition, the contact portions of the lip portions 3A and 3B of the seal member 3 are flat in the first embodiment, but the contact portions are shaped into saw-toothed irregularities to reduce the diameter reducing force or When the diameter expansion force works, the unevenness may be crushed and brought into close contact with each other to exert a crimping effect.

It is principal part sectional drawing explaining the outline of a construction method. It is principal part sectional drawing which made the propulsion pipe protrude in the casing. It is a principal part longitudinal cross-sectional view which shows the joint structure of a manhole side wall and a propulsion pipe. It is a perspective view of a short tube sleeve. It is a principal part longitudinal cross-sectional view which shows the joint structure of 2nd Embodiment. It is a perspective view of the short tube sleeve provided with the annular groove. (A) is principal part sectional drawing in which the annular groove was provided in the manhole side rather than the inner lip part, (b) is principal part sectional drawing in which the annular groove was provided in the same position as the inner lip part. .

DESCRIPTION OF SYMBOLS 1 Joint structure 2, 10 Short pipe sleeve 2A Expanded diameter part 3 Sealing member 9 Adhesive 12 Annular groove 31 Pipe connection port 32 Manhole side wall 35 Casing 40A Propeller pipe end

Claims (3)

A joint structure that connects a propulsion pipe to a pipe connection port of a manhole,
By inserting into the pipe connection port from the inside of the manhole, a substantially cylindrical short tube sleeve that is coaxially fitted to the end of the propulsion tube and closely contacts,
A flexible annular ring that is fixed in advance to the outer peripheral surface of the non-flexible short tube sleeve, having an outer lip portion that is expanded radially outward by the diameter expanding member and is fixed to the inner surface of the pipe connection port. A sealing member;
A stepped portion or manhole formed in the short pipe sleeve that restricts the fitting of the short pipe sleeve to the propulsion pipe so that the outer lip portion is within the thickness range of the pipe connection port. A positioning means comprising an axially outer end of the short tube sleeve which is a contact portion with respect to the inner surface of the outer casing ;
A joint structure of a propulsion pipe, characterized by comprising:   The joint structure for a propulsion pipe according to claim 1, wherein an annular rubber packing is attached to an inner peripheral surface of the short pipe sleeve, and a space between the short pipe sleeve and the propulsion pipe is sealed with the rubber packing. A method for connecting a pipe connection port of a manhole and a propulsion pipe including the following steps (a) to (c).
(A) Inserting a non-flexible substantially cylindrical short tube sleeve in which the inner end of a flexible annular sealing member is fixed to the outer peripheral surface into the pipe connection port from the inside of the manhole A first step of disposing a seal member in the pipe connection port; (b) by a stepped portion formed in the short tube sleeve or an axially outer end of the short tube sleeve serving as a contact portion with the inner surface of the casing outside the manhole. A second step of coaxially fitting the short tube sleeve to the end portion of the propelling tube until the fitting in the axial direction to the propelling tube is regulated (c) by the regulation of the fitting The outer lip portion of the annular seal member at a position within the wall thickness range of the pipe connection port is expanded radially outward by a diameter expanding member and fixed to the inner surface of the pipe connection port, and the annular seal member At the piping Third step of sealing between the connection port and the short tube sleeve

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