JP2620754B2 - Repair pipe connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair pipe made of a shape memory resin used for repairing an underground pipe such as a sewage main pipe or an installation pipe from the inside. The present invention relates to a connection structure in a case where a plurality of repair pipe members are connected and configured.

[0002]

2. Description of the Related Art If an underground pipe such as a mounting pipe is cracked or a connection part is displaced due to aging, an earthquake, or land subsidence, the cracked part or the connection part must be repaired immediately. No. In this repair, a crack portion or the like may be partially repaired, but in many cases, a long repair pipe material is arranged in the underground pipe to form a lining on the underground pipe over the whole or over a long range. As the repair pipe material, a material impregnated with an uncured curable synthetic resin is used. However, as described in JP-A-2-240487, a repair pipe material made of a shape memory resin has recently been used. It has begun to be adopted.

[0003] Even if the shape memory resin is deformed at a temperature equal to or higher than the shape recovery temperature and lower than the shape memory temperature, and cooled to fix the deformation, the shape memory resin returns to the shape (original shape) at the shape memory temperature when heated to the shape recovery temperature or higher. After returning to its original shape, it has the property of maintaining its original shape even when cooled to room temperature. Therefore, if this shape memory resin is used, the original shape is formed into a shape having an outer diameter corresponding to the inner diameter of the underground pipe to be repaired, and it is easy to insert into the underground pipe at a shape recovery temperature or more and less than the shape memory temperature. The repair tube is formed by deforming it into a cross-sectional shape, then cooling and fixing the deformation, inserting this repair tube into the underground pipe, heating it to a temperature above the shape recovery temperature, and returning to the original shape in the underground pipe Then, a repair method of forming a lining in the underground pipe becomes possible.

[0004]

However, if the repair pipe is formed as a continuous piece, it cannot be transported to the repair site while being extended, so that it must be folded or otherwise deformed. Then, in the insertion work at the repair site, a work for eliminating this deformation is necessary, but this work is often troublesome. In order to solve this inconvenience, it is necessary to manufacture a plurality of relatively short repair pipe members, and connect the plurality of repair pipe members to form a repair pipe at the time of insertion work at a repair site. In this case, it is conceivable that, in this case, the repair pipe member memorizes a pipe shape having an outer diameter slightly larger than or equal to the inner diameter of the underground pipe, and then tension is applied in the length direction to reduce the diameter to a small diameter body. It is often deformed, and each repair tube member contracts in the length direction as the shape is recovered. Therefore, when the shape of the entire repairing pipe material is almost simultaneously recovered, the repairing pipe members are separately and largely reduced in the length direction at the same time, so that a large force acting in a direction away from the connecting portion acts to disconnect the connecting portion. There is. The repair pipe material is sequentially heated from one end side to the other end side to the shape recovery temperature or higher, and the repair pipe member is gradually reduced little by little and only in one direction. Although it is possible to prevent it from acting, the work tends to be complicated, and in the case where the connecting portion is of a type in which the end of the other repair pipe member is fitted outside the end of the other repair pipe member. There is a possibility that the end of the other repair pipe member recovers its shape first and expands its diameter, and as a result, the connection portion may be in a state where it is more likely to come off.

Accordingly, an object of the present invention is to provide a connection structure for a repair pipe member which can easily connect the repair pipe member while securely connecting the repair pipe member.

[0006]

In order to achieve this object, a connecting structure for a repair pipe member according to the present invention comprises connecting a plurality of repair pipe members made of a shape memory resin to form a repair pipe material. A method of forming a lining by recovering the shape of a pipe material in an underground pipe, a connection structure of a repair pipe member used in the method,
The end of the repair pipe member is configured to undulate in the length direction, and the ends are fitted together. In order to further facilitate the connection operation, it is preferable to form one end of the ends with a small diameter. In the case of using such a connection structure, one end is formed to have a small diameter in order to reduce the manufacturing cost of the repair pipe member,
A repair pipe member configured such that one end and the other end are wavy in the longitudinal direction is manufactured, and one end of another repair pipe member is sequentially fitted inside the other end. It is preferable to form a repair pipe having a predetermined length.

In order to achieve a strong connection while ensuring smooth connection workability, the end of the repair pipe member has a radial portion having a retaining function and an inclined portion having a sliding function alternately. It is effective that it is formed and undulates in the length direction.

[0008] In order to further strengthen the connection state, it is preferable to heat only the inner end of the repair pipe member to slightly expand the diameter. It is also effective to apply an adhesive to the ends.

[0009]

When the end of another repair pipe member is pushed into the end of the repair pipe member, the corrugated shapes of both ends are overlapped to prevent the repair pipe member from being easily separated. Even if the diameters of the end portions are the same, it is possible to fit the end portions together by strongly pushing them in, but there is a possibility that cracks may occur. Therefore, if one end is formed to have a small diameter, the ends can be easily fitted together, and if the degree of diameter reduction and the size of the wave (magnitude of the amplitude) are appropriately set, the end is prevented. The function is not significantly reduced. It is preferable that the degree of diameter reduction is made smaller by the thickness of the repair pipe member. If one end is formed to have a small diameter, and one end and the other end are used in a lengthwise direction to form a repair pipe member, the repair pipe member having a predetermined length is formed by one type of repair pipe member. Repair pipe material can be configured.

In order to ensure a sufficient retaining function, it is preferable to include a radial portion in the corrugated shape so that the repair tube portion is not easily separated by the contact of the radial portion. In such a case, the fitting operation may be difficult. Therefore, an inclined portion having a sliding function is formed alternately with the radial portion so that the end portion can be easily pushed.

The shape memory resin tends to return to its original shape when heated. Even when heated at a temperature slightly lower than the shape recovery temperature, it has the property of slowly returning to its original shape. Therefore, only the end fitted inside is heated at an appropriate temperature (it is more preferable to work at a temperature slightly lower than the shape recovery temperature than for instantaneous heating at a temperature equal to or higher than the shape recovery temperature). If the diameter is adjusted to be in close contact with the outer end, a reliable retaining function can be ensured. In this case, before heating and expanding the diameter, the inner end and the outer end may be fitted with a large play, so that the end fitted inside has a considerably small diameter. Can be formed as

When the adhesive is applied to the ends, the adhesive is applied to the center of the corrugated portion in the longitudinal direction so that the adhesive is not exposed to the outside. preferable.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a case where a repair pipe member connected by the connection structure according to the present invention is inserted into a mounting pipe.

An attachment pipe 3 (underground pipe) is connected to the sewage mass 1 so that one end is opened to the lower side, and the other end of the attachment pipe 3 is connected to a sewage main pipe (not shown). I have. The repair pipe members 5, 5 ',... Made of shape memory resin are formed in a relatively short tubular body, the outer diameter of which is smaller than the inner diameter of the mounting pipe 3, and inserted into the mounting pipe 3 sequentially from the opening 7. Is done. Repair pipe members 5, 5 '... are connected in advance,
After that, it is possible to insert it into the mounting tube 3,
Since the length of the repair material to be handled is shorter when inserted sequentially, workability is excellent.

First, the first repair pipe member 5 is inserted into the mounting pipe 3 while supplying heated air A from the rear end side and heating the whole to a temperature slightly lower than the shape recovery temperature (softening temperature). I do. At the softening temperature, the elasticity of the repair pipe member 5 is reduced, so that the repair pipe member 5 is bent and deformed in the vicinity of the inlet 9 of the sewage mass 1 and the opening 7 of the fitting pipe 3 while being deformed naturally. When the rear end of the repair pipe member 5 reaches the vicinity of the inlet 9 of the sewage mass 1, the tip of the second repair pipe member 5 ′ is moved to the rear end of the first repair pipe member 5. Connecting. Thereafter, the heating air A is also supplied from the rear end side of the second repair pipe member 5 'to heat the second repair pipe member 5' and the first repair pipe member 5 to the entire softening temperature. Continue insertion work while doing so.

FIG. 2 is a sectional view showing details of the repair pipe members 5, 5 '.

The repair pipe members 5, 5 '...
13 is configured to undulate in the length direction, and one end 11 is formed to have a smaller diameter by the thickness. That is, the corrugated shape of the other end 13 is the repair pipe members 5, 5 '
.. while the wavy shape is centered on the center G of the thickness of the middle portion 15, whereas the waveform shape of the one end 11 is the center G of the thickness
It undulates about the inner side (see reference numeral G ′) by the thickness of the intermediate portion 15. The one end portion 11 is formed such that an inclined portion 19 whose diameter gradually increases and a radial portion 21 that projects radially inward continuously from the inclined portion 19 are repeatedly formed from the end, following the cylindrical portion 17. The other end 13 has a cylindrical portion 23, a radial portion 25 projecting outward in the radial direction, and an inclined portion 27 that gradually reduces in diameter continuously from the radial portion 25. It is configured to be.

It should be noted that in the figure, reference numeral 29 denotes an adhesive application location when an adhesive is used.

FIG. 3 is a sectional view showing a connection state between the repair pipe member 5 and the repair pipe member 5 '.

The other end 13 of the second repair pipe member 5 'is pushed into the outside of the one end 11 of the first repair pipe member 5 and fitted. During the pushing operation, the inclined portion 19 formed at one end 11 of the first repair pipe member 5 is formed.
And the cylindrical portion 23 and the inclined portion 27 formed at the other end 13 of the second repair pipe member 5 ′ make strong contact with each other, but the inclined portion 19 and the cylindrical portion 23 and the inclined portion 27 Since it slides, it can be easily pushed in. After the pushing operation is completed, the hose 31 is inserted from the rear end of the repair pipe member 5 '. A plurality of ejection holes 35 are provided in the distal end fitting portion 33 of the hose 31 in the circumferential direction, and steam B is blown from the ejection holes 35 to one end 11 of the first repair pipe member 5. One end 11 is heated by steam B and slightly expanded in diameter, and is strongly pressed against the other end 13.

FIG. 4 is a cross-sectional view showing a state where the shape of the repair pipe is recovered.

When the required number of repair pipe members 5, 5 '... Are sequentially connected and inserted into the mounting pipe 3, and the construction and arrangement of the repair pipe members 37 are completed, the plurality of repair pipe members 5, 5'
The heating fluid is supplied to the inside of the repair pipe 37 composed of 5 ′..., And the shape of the repair pipe 37 is restored so as to be in close contact with the inner surface of the mounting pipe 3. The configuration in which the end portion is wavy in the length direction and the formation of one end portion with a small diameter are simultaneously performed in a deformation process after memorizing a simple tubular shape, and the shape is recovered by shape recovery. The lining as shown in FIG.

FIG. 5 is a sectional view showing a first modified example of the repair pipe members 5, 5 '... FIG. 6 is a sectional view and a view showing a second modified example of the repair pipe members 5, 5'. 7 is a repair pipe member 5, 5 '
It is sectional drawing which shows the 3rd modification of ....

The first to third modifications are modifications of the waveform shape of the repair pipe members 5, 5 '... Shown in FIG. 2, and the first modification is a gently curved waveform shape. 2 is a wave form in which peaks and valleys are formed as peaks,
The third modification adopts a waveform shape formed by providing convex protrusions 39 protruding outward at intervals in the length direction.

Incidentally, as shown in FIG.
A male screw 41 is formed outside one end 11 of 5 ′... And a female screw 43 is formed inside the other end 13 so that one end 11 has another end 13 of another repair pipe member. Can be connected by screwing, and a reliable connection function can be expected. Further, there is an excellent effect that a stepped portion is not formed on the inner surface of the lining, but the repair pipe members 5, 5 'are relatively thick. Due to its thinness it is very difficult to form a thread at the end (the threading is carried out after fixing the deformation of the repair pipe members 5, 5 '), and the repair pipe member must be rotated during screwing. Therefore, connection work becomes complicated. Further, as shown in FIG. 9, the outer circumference of one end 11 of the repair pipe member 5, 5 'is formed to have a small diameter, the inner circumference of the other end 13 is formed to have a large diameter, and the outer circumference of the one end 11 is formed. It is also possible to connect by fitting the inner periphery of the other end 13 of the other repair pipe member to the outside, and also has an excellent effect that no step is formed on the inner surface of the lining. Is very difficult to process, and a sufficient connection function cannot be expected.

[0027]

As described above, by using the repair pipe member connection structure of the present invention, it is possible to effectively prevent the connected repair pipe member from being separated and detached during the repair work.
Moreover, since the connection work is not complicated, the repair work can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a view showing a case where a repair pipe member connected by a connection structure according to the present invention is inserted into a mounting pipe.

FIG. 2 is a sectional view showing details of a repair pipe member.

FIG. 3 is a sectional view showing a connection state between the repair pipe member and the repair pipe member.

FIG. 4 is a cross-sectional view showing a state in which the shape of the repair pipe has been recovered.

FIG. 5 is a sectional view showing a first modification of the repair pipe member.

FIG. 6 is a sectional view showing a second modification of the repair pipe member.

FIG. 7 is a sectional view showing a third modification of the repair pipe member.

FIG. 8 is a cross-sectional view showing a repair pipe member having a thread formed at an end.

FIG. 9 is a cross-sectional view showing a repair pipe member in which the outer periphery of one end is formed with a small diameter and the inner periphery of the other end is formed with a large diameter.

[Explanation of symbols]

 3 Mounting pipe (underground pipe) 5, 5 '... Repair pipe member 19, 27 Inclined portion 21, 25 Radial portion 37 Repair pipe material

Continuing on the front page (72) Katsumi Nakamura 1-7-3 Kamyoga, Setagaya-ku, Tokyo Kansei Industrial Co., Ltd. (72) Shuji Miura 3-3-6 Nihonbashi-Honmachi, Chuo-ku, Tokyo Sun Soda Trading Co., Ltd. In-house (72) Inventor Isao Natsuhori Komaki City, Aichi Prefecture, Kita-gaiyama, Gezu 3600 Tokai Rubber Industries Co., Ltd. (56) References JP-A-3-96785 (JP, A) JP-A-63-296923 (JP, A) JP-A-5-126119 (JP, A)

Claims (6)

(57) [Claims] A repair pipe member used in a method of connecting a plurality of repair pipe members made of a shape memory resin to form a repair pipe material, and recovering the shape of the repair pipe material in an underground pipe to form a lining. The connection structure for a repair pipe member, wherein an end of the repair pipe member is configured to undulate in a longitudinal direction, and the ends are fitted to each other. 2. The connection structure for a repair pipe member according to claim 1, wherein one of the ends is formed to have a small diameter. 3. A repair pipe member used in a method of connecting a plurality of repair pipe members made of a shape memory resin to form a repair pipe material, and recovering the shape of the repair pipe material in an underground pipe to form a lining. A connection structure, wherein one end of the repair pipe member is formed to have a small diameter, the one end and the other end are configured to undulate in the length direction, and the other end is A connection structure for a repair pipe member, wherein the one end of another repair pipe member is fitted inside. 4. The end portion of the repair pipe member, wherein a radial portion having a retaining function and an inclined portion having a sliding function are alternately formed and are wavy in the longitudinal direction. 4. The connection structure for a repair pipe member according to 2 or 3. 5. The connection of a repair pipe member according to claim 1, wherein only the inner end of the repair pipe member is heated to slightly expand the diameter. Construction. 6. The connection structure for a repair pipe member according to claim 1, wherein an adhesive is applied to the end of the repair pipe member.