JP2014142045A - Regeneration method of existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a reinforcement effect of an existing pipe, in a regeneration method of the existing pipe that constructs a regeneration pipe inside the existing pipe and injects back-filling material between the inner surface of the existing pipe and the regeneration pipe.SOLUTION: A regeneration method of an existing pipe containing concrete material includes a first step in which high-pressure water is injected to the inner surface of the existing pipe and the inner surface is chipped so as to remain only a portion having relatively high strength, a second step in which a regeneration pipe is constructed inside the existing pipe, and a third step in which back-filling material is injected between the inner surface of the existing pipe chipped in the first step and the regeneration pipe constructed in the second step.

Description

  The present invention relates to an existing pipe rehabilitation technique.

  When existing pipes such as sewer pipes become obsolete and cracks, corrosion, etc. occur, rehabilitation pipes are built inside the existing pipes, and mortar and other backfill materials are placed between the inner surfaces of the existing pipes and the rehabilitation pipes. Rehabilitation methods for pipes to be injected are known. For example, the following Patent Document 1 discloses a technique for building a rehabilitation pipe by winding a resin profile. This rehabilitation method reinforces an existing pipe by integrating the existing pipe and the rehabilitation pipe through a backfilling material and resisting external force with an integral structure. According to this rehabilitation method, it is possible to rehabilitate an old existing pipe without digging up a road.

JP 2006-181861 A

  In such a rehabilitation method, it is desirable to further strengthen the integrated structure in order to improve the reinforcement effect of the existing pipe.

  The present invention has been made to solve the above-described problems, and can be realized, for example, as the following forms.

  The 1st form of this invention is provided as a rehabilitation method of the existing pipe formed including the concrete material. In this rehabilitation method, high pressure water is jetted onto the inner surface of the existing pipe, and the first step of holding the inner surface so that only a relatively high strength portion remains, and the rehabilitation pipe is built inside the existing pipe. A second step, and a third step of injecting a backfill material between the inner surface of the pre-formed pipe formed in the first step and the rehabilitated pipe built in the second step.

  According to this rehabilitation method, the backfill material exerts an anchor effect by biting into the portion of the inner surface of the existing pipe that remains due to the suspension. Therefore, the backfill material and the existing pipe are preferably integrated. In addition, a relatively high strength portion remains due to the hanger, and the portion exhibits an anchor effect, so that the adhesion between the backfill material and the prefabricated pipe is improved, and the integral relationship between the backfill material and the prefabricated pipe is: It will be solid. As a result, the reinforcing effect of the existing pipe is improved.

  As a second form of the present invention, in the first form, the second step may be to build a rehabilitated pipe by winding a resin profile inside the pre-made pipe. According to such a form, the rehabilitation pipe can be easily formed, and the rehabilitation pipe can be constructed at a relatively low cost.

It is process drawing which shows the procedure of the rehabilitation method of the existing pipe as one Example of this invention. It is explanatory drawing which shows typically the state of the pipe | tube in each process of the rehabilitation method. It is explanatory drawing which shows typically the cross section of the length direction of a pipe | tube.

A. Example:
FIG. 1 shows a procedure of a rehabilitation method for an existing pipe 20 as one embodiment of the present invention. FIG. 2 schematically shows the state of the tube in each step shown in FIG. In FIG. 2, the details are enlarged so that the state of the tube can be easily grasped, so the scale does not match the actual thing. As shown in FIG. 1, in the rehabilitation of the existing pipe 20, first, the inside of the existing pipe 20 is cleaned (step S110). As shown to Fig.2 (a), the existing pipe 20 used as the rehabilitation object is a sewer pipe which has a circular cross section in a present Example. However, the shape of the preformed tube 20 is not particularly limited, and the preformed tube 20 may have, for example, a rectangular cross section. Moreover, the ready-made pipe | tube 20 can be used not only as a sewer pipe but for arbitrary uses, for example, an agricultural pipe. Such a prefabricated pipe 20 is formed including a concrete material.

  When the inside of the pre-formed pipe 20 is cleaned, next, as shown in FIG. 1, high-pressure water is sprayed onto the inner surface 21 of the pre-formed pipe 20 to perform the concrete suspending work that forms the inner face 21 (step S120). This suspension is performed on the entire inner surface 21 in this embodiment. Unlike the mechanical suspension method using a cutter or the like, the high-pressure water suspension has a characteristic that a portion having a relatively low strength is preferentially suspended. In the present embodiment, by using such characteristics and adjusting the water pressure and the injection time, the suspension is performed so that a relatively high strength portion is left to a desired degree.

  In the present embodiment, in step S120, a guide rail is arranged along the flow direction of the pre-formed pipe 20 at the approximate center inside the pre-formed pipe 20, and a high-pressure water injection nozzle (hereinafter simply referred to as “high pressure water injection nozzle”) provided on the guide rail. It is constructed by moving the nozzle in the flow direction while jetting high-pressure water from the nozzle) toward the inner surface 21. By adjusting this moving speed, the injection time per unit area is adjusted. The means for moving the nozzle is not particularly limited, and may be electric or hydraulic. In this embodiment, the nozzle is configured to be able to rotate around the guide rail in the circumferential direction by manual operation, and the circumferential direction, that is, the injection direction can be changed, and the suspension of the predetermined area is completed. Each time the injection direction is shifted, the movement in the flow direction and injection are repeated each time. As a result, the inner surface 21 can be uniformly applied in the circumferential direction. Note that the change in the injection direction may be automated. Of course, the mode of the hanger is not particularly limited, and an operator may enter the inside of the pre-formed pipe 20 with a portable nozzle and perform the hanger manually.

  As shown in FIG. 2 (b), the suspended surface 22 is formed by the inner surface 21 of the pre-formed pipe 20 being suspended by the suspension work. A large number of concave and convex shapes 23 are formed on the hanging surface 22. The uneven shape 23 is formed not only in the unevenness in the radial direction but also in a direction intersecting with the radial direction. In addition, step S120 can serve as cleaning of the inner surface 21 of said step S110.

  Once suspended, next, the rehabilitation pipe 30 is built inside the existing pipe 20 as shown in FIG. 1 (step S130). The rehabilitation pipe 30 is a pipe that is installed inside the preformed pipe 20 and has an outer diameter smaller than the inner diameter of the preformed pipe 20. In this embodiment, a resin profile is applied as the rehabilitation pipe 30. A method of applying such a profile is well known and is described in, for example, the above-mentioned Patent Document 1. Therefore, a simple description is given, but for example, it can be applied as follows. First, a self-propelled pipe making machine is disposed on the existing pipe 20, and a belt-like profile is wound spirally by the self-propelled pipe making machine. As will be described later, a rib 31, a main lock male portion, and a main lock female portion are formed on one surface of the profile. The self-propelled pipe making machine is controlled by a hydraulic unit disposed in the existing pipe 20. The hydraulic unit is driven and controlled by an electric vehicle disposed on the ground. In the self-propelled pipe making machine, the profile is sandwiched between the fitting rollers, and the belt-like profile is drawn into the existing pipe 20 while the fitting roller rotates. Then, the self-propelled pipe making machine forms the tubular rehabilitation pipe 30 while continuously fitting the main lock male part on one side of the drawn profile to the main lock female part on the other side. In addition, the construction method of the rehabilitation pipe | tube 30 is not specifically limited, For example, instead of a self-propelled type, the main pushing type which extrudes a profile from the pipe making machine fixed in the manhole may be sufficient.

  FIG. 2C and FIG. 3 show a state where the rehabilitation pipe 30 is built. FIG. 3 shows a longitudinal section of the prefabricated pipe 20. FIG.2 (c) is the AA cross section of FIG. As shown in FIG. 2C, the rehabilitation pipe 30 is formed in a shape having a circular cross section inside the existing pipe 20. When the existing tube 20 has a rectangular cross section, the rehabilitation tube 30 is also formed in a shape corresponding thereto. A gap 40 is formed between the suspension surface 22 of the existing pipe 20 and the rehabilitation pipe 30. As shown in FIG. 3, a rib 31 protruding in a T shape is formed on the outer surface of the rehabilitation pipe 30. In FIG. 3, the main lock male portion and the main lock female portion described above are not shown.

  When the rehabilitation pipe 30 is built, finally, as shown in FIG. 1, mortar 50 as a backfill material is injected into the gap 40 (step S140). When the mortar 50 is cured, the rehabilitation of the existing pipe 20 is completed as shown in FIG. Note that a supporter may be installed inside the rehabilitation pipe 30 before the mortar 50 is injected. If it carries out like this, it can prevent reliably that the rehabilitation pipe | tube 30 deform | transforms with the injection pressure of the mortar 50, or floats up. The backfilling material is not limited to mortar, and various resin materials can be used.

  According to this rehabilitation, when the mortar 50 bites into the rib 31 of the rehabilitation pipe 30, the anchor effect is exhibited, and the rehabilitation pipe 30 and the mortar 50 are integrated. Moreover, when the mortar 50 bites into the concavo-convex shape 23 of the hanging surface 22, the anchor effect is exhibited, and the mortar 50 and the preformed tube 20 are preferably integrated. In particular, since the concavo-convex shape 23 of the mortar 50 is formed only at a portion having a relatively high strength by jetting high-pressure water, the mortar 50 and the existing tube 20 are firmly integrated. In other words, the adhesion between the mortar 50 and the existing pipe 20 is significantly improved as compared with the conventional method in which the uneven shape 23 is not formed. As a result, the aging prefabricated pipe 20 is rehabilitated as a high-strength composite pipe in which the renovated pipe 30, the mortar 50, and the prefabricated pipe 20 are integrated. In addition, when the inner surface 21 of the preformed tube 20 is pulled, the dirt adhering to the inner surface 21 is completely removed, and the lime component having an adhesive function is exposed. These events also contribute to improving the adhesion between the mortar 50 and the existing pipe 20.

  In particular, when the rehabilitation tube 30 is a tube having a substantially rectangular cross section such as a box culvert, the rehabilitation tube 30 and the mortar 50 are applied to the upper surface of the rectangular shape by a downward force due to gravity. Therefore, the construction method of this example is effective.

  A method of bonding the mortar 50 and the existing tube 20 with an adhesive is possible without forming the uneven shape 23. However, according to the method of the present embodiment, there are restrictions such as temperature and humidity as in the case of an adhesive. Since it is not received, construction is easy. However, the construction method of this embodiment does not exclude the use of an adhesive, and the adhesiveness can be further improved by using the construction method of this embodiment and the use of an adhesive together.

B. Variations:
B-1. Modification 1:
In the above-described embodiment, an example in which the inner surface 21 of the preformed pipe 20 is entirely covered has been shown, but the range of the hanger may be only a part of the inner surface 21. For example, the range of the hanger may be only the upper part of the inner surface 21 (for example, only the upper half of the prefabricated pipe 20, only the upper third of the prefabricated pipe 20). Even in this case, the adhesiveness with the mortar 50 can be improved with respect to the upper part of the inner surface 21 where it is difficult to ensure the adhesiveness by the gravitational action.

B-2. Modification 2:
The construction method and material of the rehabilitation pipe 30 are not particularly limited, and various forms can be adopted. For example, a resin or metal pipe may be laid inside the existing pipe 20 by propulsion or conveyance assembly. Alternatively, a flexible resin pipe material may be drawn into the existing pipe 20 and the pipe material may be expanded by air pressure, vapor pressure, or the like.

  The embodiments of the present invention have been described above based on some examples. However, the above-described embodiments of the present invention are for facilitating the understanding of the present invention and limit the present invention. It is not a thing. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof. Moreover, in the range which can solve at least one part of the subject mentioned above, or the range which exhibits at least one part of an effect, the combination of each component described in the claim and the specification, or omission is possible. .

20 ... Prefabricated tube 21 ... Inner surface 22 ... Hanging surface 23 ... Uneven shape 30 ... Rehabilitation tube 31 ... Rib 40 ... Void 50 ... Mortar

Claims (2)

A method for rehabilitating a prefabricated pipe formed with concrete material,
A first step of injecting high-pressure water onto the inner surface of the pre-formed pipe and suspending the inner surface so that only a relatively high strength portion remains;
A second step of constructing a rehabilitation pipe inside the pre-formed pipe;
And a third step of injecting a backfill material between the inner surface of the pre-formed tube formed in the first step and the rehabilitated tube constructed in the second step. Rehabilitation method. A method for rehabilitating an existing pipe according to claim 1,
In the second step, the rehabilitated pipe is constructed by winding a resin profile inside the pre-formed pipe.

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