JP5192735B2 - Rehabilitation of existing pipes - Google Patents

Description

The present invention relates to rehabilitation methods already設管you rehabilitate existing pipe such as aging sewer pipes.

Conventionally, a lining pipe made of a thermoplastic resin such as vinyl chloride, which is smaller in diameter than an inner diameter of an existing pipe and recovers a circular pipe shape at a shape memory temperature, in an existing pipe such as a sewer pipe buried underground. A rehabilitation method has been proposed and widely implemented, in which the lining pipe is heated to restore the shape of a circular tube, and then pressurized to expand and expand, and the lining pipe is brought into close contact with the inner peripheral surface of the existing pipe. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 11-230212

  In such a rehabilitation method, when the lining pipe is lined while flowing water such as sewage is flowing through the existing pipe, the lining pipe is cooled by contact with the flowing water. The rise may be inadequate. If the temperature rise due to heating of the lining pipe is insufficient, when the lining pipe is restored to the shape of a circular pipe, or the softened lining pipe is pressurized to expand and expand to adhere to the inner peripheral surface of the existing pipe At that time, there is a high possibility that the finished state will be incomplete.

  This invention is made in view of such a problem, and makes it a subject to heat the lining pipe for pipe rehabilitation to predetermined temperature, and to be able to rehabilitate the existing pipe while ensuring quality. .

The rehabilitation method for an existing pipe according to the present invention is a rehabilitation method for an existing pipe in which a lining pipe for rehabilitation of a pipe and a tubular body for rehabilitation are fixed to an inner surface of an existing pipe embedded in the ground. Is formed in a tubular shape, an inner heat insulating layer formed of a thermoplastic resin and having a heat insulating property, and an intermediate water impermeable layer formed of a thermoplastic resin and having a water blocking property provided outside the heat insulating layer , the provided outside the impermeable layer consists of a protective layer that reinforces the impermeable layer, inserting said rehabilitating a tubular body into the existing pipe, then smaller than the inner diameter of the formed by a thermoplastic resin wherein the existing pipe the pipe rehabilitation lining pipe folded, after insertion into the tubular body for the rehabilitation, the pipe rehabilitation linings pie is expanded diameter by heating and pressurizing the tube rehabilitating lining pipe Was in close contact with the rehabilitation for the tubular body, then brought into close contact with the inner circumferential surface of the existing pipe is expanded diameter by applying further heat and pressure to the pipe rehabilitation lining pipe and said rehabilitating a tubular body formed by integrating after is to fixed to the inner peripheral surface of said existing pipe by said was restored inflation tube rehabilitating lining pipe and said rehabilitating a tubular body to cool while pressing.

According to the present invention, the flowing water is prevented from entering the heat insulating layer by the impermeable layer, and flows into the existing pipe in contact with the outer surface of the tubular body for rehabilitation of the existing pipe. Subsequently, after inserting the pipe rehabilitation lining pipe into the rehabilitation tubular body, the pipe rehabilitation lining pipe is heated and pressurized. At this time, the penetration of running water into the inside of the tubular body for rehabilitation of the existing pipe is prevented, so that it is possible to prevent the lining pipe for pipe rehabilitation from being cooled by the running water and the temperature rise from becoming insufficient. .
The tubular body for rehabilitation, when the lining pipe for rehabilitation of the pipe is inserted into the tubular body for rehabilitation of the pipe, the tubular body for rehabilitation is pulled in the direction of the tube axis and contacts the inner surface of the existing pipe. The impermeable layer is reinforced and protected by a protective layer on the outer side thereof, so that the entire tubular body for rehabilitation is pulled in the tube axis direction without being broken, so that wrinkles and twists in the pulling direction are extended.

The rehabilitation method for an existing pipe according to the present invention is a rehabilitation method for an existing pipe in which a lining pipe for rehabilitation of a pipe and a tubular body for rehabilitation are fixed to an inner surface of an existing pipe embedded in the ground. Is formed in a tubular shape, an inner heat insulating layer formed of a thermoplastic resin and having a heat insulating property, and an intermediate water impermeable layer formed of a thermoplastic resin and having a water blocking property provided outside the heat insulating layer , the provided outside the impermeable layer consists of a protective layer that reinforces the impermeable layer, said existing pipe, the pipe rehabilitation lining pipes folded diameter smaller than the inner diameter of the formed by a thermoplastic resin wherein the existing pipe when inserting, after insertion in the retread a tubular body also same step provided between the existing pipe and the pipe rehabilitation lining pipe, heated and pressurized the tube rehabilitating lining pipe And by inflating diameter are brought into close contact with the pipe rehabilitation lining pipe into the rehabilitation for tubular body, then the inflating expanded by applying further heat and pressure to the pipe rehabilitation lining pipe and said rehabilitating a tubular body after close contact with the inner circumferential surface of the existing pipe is to fixed to the inner peripheral surface of said existing pipe by said was restored inflation tube rehabilitating lining pipe and said rehabilitating a tubular body to cool while pressing.

Rehabilitation method of the existing pipe of the present invention, in the step of pulling the pipe rehabilitation lining pipe into the existing pipe, Macri as previously left over the distal end of the rehabilitation for tubular body, and cutting the pipe rehabilitation lining pipe , then attach the traction wire and the tip cover to the tip portion of the pipe rehabilitation lining pipe, to the traction wire and the tip cover, is covered with a distal end portion of the rehabilitating a tubular body which had I sow, the the strapping material to the traction wire tying the leading end of the rehabilitation for tubular body.

  According to the present invention, even in an environment where running water such as sewage flows down in an existing pipe, the existing pipe can be rehabilitated by reliably heating the lining pipe for pipe rehabilitation to a predetermined temperature. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a pipe rehabilitation lining pipe 1 in which a pipe rehabilitation tubular body of the present invention is laminated is laminated on a pipe main body 2 formed into a circular pipe shape by a thermoplastic resin and on the outer surface of the pipe main body 2. And a heat insulating layer 3 as a tubular body for pipe rehabilitation, and in a state before being inserted into the existing pipe K, its cross-sectional shape is folded into a substantially U shape to be smaller than the inner diameter of the existing pipe K. Has been.

  Examples of the thermoplastic resin that forms the pipe body 2 include hard vinyl chloride resin, polyethylene, and polypropylene. The pipe body 2 has a performance of recovering its shape into a circular pipe shape by being heated to a predetermined shape memory temperature (for example, 80 ° C.).

  The heat insulating layer 3 may be a thermoplastic resin such as a hard vinyl chloride resin, a polyurethane resin, or a polyethylene resin, in particular, a foam containing the bubbles therein, corresponding to the material of the pipe body 2. Moreover, the heat conductivity of the heat insulation layer 3 is 0.1 W / m * degrees C or less, and the thickness needs to be 2 mm or more and 3 mm or less. If the thermal conductivity of the heat insulating layer 3 exceeds 0.1 W / m · ° C., the heat insulating effect cannot be secured, and if the thickness of the heat insulating layer 3 exceeds 3 mm, the rehabilitation by the lining pipe 1 for pipe rehabilitation is performed. The finished inner diameter of the pipe is reduced, and the cross-sectional area of the flowing water is reduced, so that the set amount of flowing water cannot be secured.

  In addition, it does not specifically limit as lamination | stacking of the heat insulation layer 3 with respect to the pipe main body 2, For example, you may form the heat insulation layer 3 integrally at the time of shaping | molding of the pipe main body 2, and the heat insulation layer 3 after shaping | molding of the pipe main body 2 is carried out. May be bonded via an adhesive or wound and fixed.

  Next, a method for rehabilitating the existing pipe K using the pipe rehabilitation lining pipe 1 will be described with reference to FIGS.

  This rehabilitation work is executed after high pressure water cleaning of the inner peripheral surface of the existing pipe K is performed. In addition, although flowing water, such as sewage, flows down from the upstream side to the downstream side through the existing pipe K, that is, from the starting side manhole M1 to the reaching side manhole M2, prior to the construction, the mesh is formed upstream of the starting side manhole M1. The screen S (see FIG. 2) is disposed to cover the cross section of the flowing water, so that solids such as dirt and earth contained in the flowing water are filtered.

  In such a state, the pipe lining lining pipe 1 is inserted into the existing pipe K. For this reason, the pipe lining pipe 1 having a predetermined length, for example, a length obtained by adding a margin to the length between the start side manhole M1 and the arrival side manhole M2 is prepared in the start side manhole M1, and the arrival side A winch W for winding the pulling wire 5 of the pipe lining pipe 1 is installed in the manhole M2. Further, the tip of the pipe lining pipe 1 is pinched, and the pulling wire 5 is inserted into the existing pipe K between the arrival-side manhole M2 and the starting-side manhole M1, and is pinched in the starting-side manhole M1. Connect to the tip of the lining pipe 1.

  As an operation for drawing the tow wire 5 into the existing pipe K extending from the arrival side manhole M2 to the start side manhole M1, for example, the tow wire 5 is connected to a wire material made of carbon fiber, and the wire material is connected to the arrival side manhole. What is necessary is just to penetrate with the wire 5 for a traction from M2 to the starting side manhole M1.

  When the traction wire 5 is connected to the tip of the pipe lining pipe 1, the winch W is driven to wind the traction wire 5, and the pipe lining pipe 1 is drawn into the existing pipe K (FIG. 2). reference). On the other hand, when the pipe rehabilitation lining pipe 1 is drawn into the existing pipe K, the flowing water from which the solid matter has been filtered comes into contact with the outer surface of the pipe rehabilitation lining pipe 1 and flows from the upstream side to the downstream side in the existing pipe K. Although the pipe lining pipe 1 flows down, since the heat insulating layer 3 is laminated on the outer surface of the pipe body 2, the flowing water that contacts the outer surface of the pipe lining pipe 1 contacts the heat insulating layer 3. Then, contact with the pipe body 2 is prevented.

  If the pipe rehabilitation lining pipe 1 is drawn into the existing pipe K, the pipe rehabilitation lining pipe 1 is extended to a manhole of a certain length in consideration of the linear expansion during cooling in the start side manhole M1 and the arrival side manhole M2. After being cut in a state of being cut, plugs 6 are attached to the respective ends to close the plugs, while one end side plug 6 is connected to a heating medium generator, for example, a heating steam generator G (see FIG. 3). The other end of the heat medium supply pipe 7 to which one end is connected is connected, and one end of the heat medium discharge pipe 71 is connected to the other end side plug body 6.

  Next, when the heating steam generator G is driven and the heating steam is supplied to the pipe lining pipe 1 through the heat medium supply pipe 7, the heat of the heating steam is transmitted to the pipe lining pipe 1. Also in this case, the lower outer peripheral surface of the pipe lining pipe 1, that is, the heat insulating layer 3 is in contact with flowing water, but the inner peripheral surface thereof, that is, the pipe body 2 does not contact the flowing water. . For this reason, the lining pipe 1 for pipe rehabilitation is sufficiently heated and softened from the inner peripheral surface side by the heating steam supplied to the inside thereof, and is restored to the shape of a circular pipe and is pressurized by the pressure of the heating steam. Then, the diameter is expanded and brought into close contact with the inner peripheral surface of the existing pipe K (see FIG. 4).

  At this time, the foam bubbles constituting the heat insulating layer 3 are compressed, so that the thickness of the heat insulating layer 3 is reduced. As a result, the finished inner diameter of the lining pipe 1 for pipe rehabilitation is increased, and the flow of the rehabilitation pipe line is increased. A decrease in the road cross-sectional area can be suppressed, and the tightness of the pipe lining lining pipe 1 to the existing pipe K can be ensured.

  Further, since the pipe lining pipe 1 is brought into close contact with the inner peripheral surface of the existing pipe K, the flowing water does not come into contact with the pipe body 2 of the pipe lining pipe 1, and the pipe lining is formed by contacting the flowing water. The temperature drop of the pipe 1 is prevented. In addition, the flowing water flowing down in contact with the outer peripheral surface of the pipe rehabilitation lining pipe 1 is filtered solids, and when the pipe rehabilitation lining pipe 1 is in close contact with the inner peripheral surface of the existing pipe K, the solids are removed. It is possible to ensure finished quality without biting and forming protrusions.

  The excessive heating steam supplied to the pipe rehabilitation lining pipe 1 is discharged through the heat medium discharge pipe 71, and the internal pressure of the pipe rehabilitation lining pipe 1 is kept constant.

  If the pipe rehabilitating lining pipe 1 is heated and pressurized by heating steam for a set time to be in close contact with the inner peripheral surface of the existing pipe K, the heating steam generator G is stopped while the cooling medium, for example, A blower (not shown) is driven to supply normal temperature pressurized air to the lining pipe 1 for pipe rehabilitation through the heat medium supply pipe 7. When normal temperature pressurized air is supplied to the pipe rehabilitation lining pipe 1, the pipe rehabilitation lining pipe 1 exchanges heat with normal temperature pressurized air supplied in place of heated steam, and is heated by pressurized air. Cooling while continuing the pressure.

  If the pipe rehabilitation lining pipe 1 is cooled and falls below the set temperature by exceeding the glass transition temperature, the supply of pressurized air is stopped, and then the pipe rehabilitation lining pipe 1 is moved along the edge of the existing pipe K. And cut. Thereby, the flowing water in which the flow in the existing pipe K is blocked along the pipe rehabilitation lining pipe 1 in close contact with the inner peripheral surface of the existing pipe K resumes the flow.

  As described above, by adopting the rehabilitation method for the existing pipe K using the lining pipe for pipe rehabilitation, the pipe can be used even in an environment where flowing water flows down the existing pipe or intrusion water is recognized in the existing pipe. Since the pipe body of the lining pipe for rehabilitation can be sufficiently heated and pressurized to expand and expand and be brought into close contact with the existing pipe, the existing pipe can be rehabilitated by the lining pipe for rehabilitation that ensures the finished quality.

  Therefore, the rehabilitation work can be performed without performing the water change work, the construction time can be shortened, and traffic congestion associated with the water change work is not caused. In addition, rehabilitation work for existing pipes can be performed even under road conditions where water replacement work is not possible.

  In this embodiment, the case where heating steam is used as the heating medium has been described. However, hot air or hot water may be used, and normal temperature pressurized air is used as the cooling medium. May be.

  Moreover, although the case where the mesh-shaped screen S as a filter was provided upstream of the starting side manhole M1 and the solid substance was filtered was illustrated, it replaced with the screen S and provided the weir of the height corresponding to flow volume, A solid substance may be accumulated in the upstream portion, and the flowing water may overflow the weir to remove the solid substance, and the flowing water with relatively little solid substance may be allowed to flow down.

  Furthermore, although the foam which contains a bubble inside was illustrated as a heat insulation layer, as the bubble of a foam, the open cell which the bubble communicates may be sufficient. When adopting a foam containing such open cells as the heat insulating layer 3, since the flowing water is absorbed inside the open cells and the heat insulation performance is reduced, so that the flowing water is not absorbed by the open cells, An impermeable layer 4 (see FIG. 5) is laminated on the outer surface of the heat insulating layer 3.

  While the foam lining pipe 1 is pressurized, the foam bubbles are easily crushed and the thickness is quickly reduced. On the other hand, the impermeable layer 4 prevents the flowing water from being absorbed into the continuous bubbles, thereby improving the heat insulation effect. Reduction can be prevented. Examples of the water-impermeable layer 4 include hard vinyl chloride resin, polyethylene resin, and polyethylene terephthalate resin.

  Next, an existing pipe rehabilitation method according to another embodiment of the present invention will be described. In this rehabilitation method, a pipe rehabilitation lining pipe 10 shown in FIG. 6 and a rehabilitation tubular body 11 made of a laminated sheet are used.

  The lining pipe 10 for pipe rehabilitation is formed into a circular pipe shape by a thermoplastic resin such as hard vinyl chloride, and in a state before being inserted into the tubular body 11 for rehabilitation described later, the cross-sectional shape is substantially U. It is folded into a letter shape and formed to have a smaller diameter than the inner diameter of the existing pipe K, and has the ability to recover the shape of a circular pipe when heated to a predetermined shape memory temperature (for example, 80 ° C.).

  As shown in FIG. 6 (a), the rehabilitation tubular body 11 includes an inner heat insulating layer 12 having heat insulating properties, and an intermediate impermeable layer 13 having water shielding properties provided outside the heat insulating layers 12. A laminated sheet provided outside the impermeable layer 13 and having a protective layer 14 that reinforces the impermeable layer 13 is formed into a tubular shape.

  Examples of the heat insulating layer 12 include a thermoplastic resin such as a foam, a nonwoven fabric, a woven fabric, or a film made of a hard vinyl chloride resin or a urethane resin. The heat insulating layer 12 has a thermal resistance value of 0.01 m 2 · K / W or more and a maximum tear strength in the tube axis direction of 80 N or more. When the heat resistance value of the heat insulation layer is less than 0.01 m 2 · K / W, heating of the lining pipe 10 for pipe rehabilitation becomes insufficient, and as a result, restoration and diameter expansion become insufficient, and the finished quality deteriorates. It becomes.

  The impermeable layer 13 is made of a thermoplastic resin film having a soft thickness of 0.2 mm or less without transmitting water within the construction time, and is made of a film such as hard vinyl chloride, soft polyvinyl chloride, polyethylene, or polyethylene terephthalate. Can be mentioned. The impermeable layer 13 has a water permeability coefficient of 10 nm / second or less and a 65 ° C. tensile strength of 1.7 MPa or more.

  The impermeable layer 13 is a thermoplastic plastic film that is laminated in the middle of the tubular body 31 and has no open cells and can be fused. When there are continuous bubbles, water is likely to be generated, and sewage passes through the impermeable layer 13, and the effect of the heat insulating layer 12 cannot be expected. In addition, by adopting a thin plastic film and ultrasonically fusing from above the protective layer 14, strength and water stoppage are ensured. When the thickness is increased, a high-strength film can be obtained, but the workability is remarkably reduced. As a result, the heating of the pipe lining pipe 10 for pipe rehabilitation becomes insufficient, the temperature does not rise, and the finished inner surface is defective.

  A thin plastic film refers to a general numerical value of 0.2 mm or less that can be fused by heat or electromagnetic waves. Further, the strength of the film and the fused portion is 1.7 MPa or more as a tensile strength at 65 ° C. so that the pipe lining pipe 10 for pipe rehabilitation does not break due to a circumferential stress generated in order to be brought into close contact with the existing pipe K by a restoring force. Need.

  The protective layer 14 is made of a non-woven fabric of polyethylene resin or polyethylene terephthalate resin that reinforces the water-impermeable layer 13, and has a maximum tear strength of 80 N or more.

  The finished thicknesses of the heat insulating layer 12, the water-impermeable layer 130 and the protective layer 14 are not particularly limited, but it is necessary to satisfy the respective physical property values, and in order to ensure the flow rate after rehabilitation by the pipe rehabilitation lining pipe 10. It should be as thin as possible. For example, the heat insulation layer has a thermal resistance value of 0.01 m 2 · K / W or more, the water impermeable layer has a water permeability coefficient of 10 nm / second or less, and the protective layer is a nonwoven fabric having a tear maximum strength of 50 N or more, The SDR is preferably set to 22.5 or more. The material or shape of each layer need not be the same, and may be a separate material or shape. Further, at least the water-impermeable layer 13 and the protective layer 14 may be integrally formed in advance.

  It is desirable that the rehabilitation tubular body 11 has an outer peripheral length equivalent to that of the existing pipeline K so that wrinkles and twists do not occur. Therefore, the tubular body 11 for rehabilitation has a tensile strength of 1.7 MPa or more, which is a tensile stress that is higher than the circumferential stress when the lining pipe 10 for pipe rehabilitation is formed, and has an elongation at break of 50% or more. Is preferred.

  When using a non-woven fabric or woven fabric for the heat insulating layer 12 and the protective layer 14, it should be entangled with the cutting blade of the automatic cutting machine in consideration of the drilling operation by the automatic cutting machine at the mounting pipe opening after laying. It is preferable to use short fibers that are free from trouble or that are less likely to fail even if entangled.

  Further, the tubular body 11 for rehabilitation is folded in an inverted state before being inserted into the existing pipe K, but is extended from the inverted folded state by supplying pressurized air therein. It has become. In this case, the length of the tubular body 11 for rehabilitation when it is extended from the inverted folded state is such that the length of the tubular body 11 for rehabilitation inserted with a margin in the existing pipe K between the starting side manhole M1 and the reaching side manhole M2. It is set to be longer than the length of the lining pipe 10.

  Next, a method for rehabilitating the existing pipe K using the pipe rehabilitation lining pipe 10 and the rehabilitation tubular body 11 will be described with reference to FIGS.

  This rehabilitation work is executed after high pressure water cleaning of the inner peripheral surface of the existing pipe K is performed. In addition, flowing water such as sewage flows from the upstream side to the downstream side through the existing pipe K, that is, from the starting side manhole M1 to the reaching side manhole M2.

  In such a state, the rehabilitation tubular body 11 folded in an inverted state is inserted into the existing pipe K through the start side manhole M1, and compressed air is supplied from the start side manhole M1 to the rehabilitation tubular body 11, While extending so that the water permeable layer faces outward, it extends to the reaching manhole M (see FIG. 7).

  When the rehabilitation tubular body 11 is inserted into the existing pipe K, the flowing water (not shown) is prevented from entering the heat insulating layer 12 by the impermeable layer 13 and comes into contact with the outer surface of the rehabilitation tubular body 11. Then, the existing pipe K flows down from the upstream side to the downstream side. Next, a pipe rehabilitation lining pipe 10 having a length obtained by adding a margin to the length between the start side manhole M1 and the arrival side manhole M2 is prepared in the start side manhole M1, and the pipe rehabilitation lining is provided in the arrival side manhole M2. A winch W for winding the pulling wire 5 of the pipe 10 is installed.

  Further, the tip of the pipe rehabilitation lining pipe 10 is pinched, and at the start side manhole M1, the pulling wire 5 inserted through the rehabilitation tubular body 11 extending from the arrival side manhole M2 to the start side manhole M1 is pinched. Connected to the tip of the lining pipe 10.

  If the traction wire 5 is connected to the tip of the pipe rehabilitation lining pipe 10, the winch W is driven to wind the traction wire 5, and the pipe rehabilitation lining pipe 10 is drawn into the rehabilitation tubular body 11 ( FIG. 6B and FIG. 8). When the pipe rehabilitation lining pipe 10 is drawn into the rehabilitation tubular body 11, the pipe rehabilitation lining pipe 10 partially contacts the rehabilitation tubular body 11, and then the rehabilitation tubular body 11 contacts the existing pipe K. Thus, the rehabilitation tubular body 11 is pulled in the retracting direction.

  Since the impermeable layer 13 of the tubular body 11 for rehabilitation is reinforced and protected by the protective layer 14 on the outer side thereof, it is not torn and the whole tubular body 11 for rehabilitation is pulled in the tube axis direction. Wrinkles and twists are stretched. The flowing water contacts the outer surface of the tubular body 11 for rehabilitation and flows down in the existing pipe K. However, since the lining pipe 10 for rehabilitation of the pipe is inserted into the tubular body 11 for rehabilitation, the lining pipe for rehabilitation of the pipe rehabilitation is used. Contact of running water to 10 is prevented.

  Further, if there is a protrusion on the inner peripheral surface of the existing pipe K, if the rehabilitation pipe tubular body 11 and the pipe rehabilitation lining pipe 10 are simultaneously inserted, between the protrusion and the pipe rehabilitation lining pipe 10, The rehabilitation tube tubular body 11 may be torn. However, when the rehabilitation tube tubular body 11 is inserted and then the rehabilitation tube tubular body 11 is not torn, the rehabilitation tube tubular body 11 is not torn. It can be held securely.

  If the pipe rehabilitation lining pipe 10 is drawn into the rehabilitation tubular body 11, the pipe rehabilitation lining pipe 10 is converted into a manhole having a fixed length in consideration of linear expansion during cooling in the start side manhole M1 and the arrival side manhole M2. After cutting in the extended state, the plug 6 is attached to each end to close the plug, while the one end plug 6 is connected to the heating steam generator G at one end. The other end of the heat medium discharge pipe 71 is connected to the other end side plug body 6.

  Next, the heating steam generator G is driven to supply the heating steam to the pipe rehabilitation lining pipe 10 through the heat medium supply pipe 7, and the heat of the heating steam is transmitted to the pipe rehabilitation lining pipe 10. In this case, as described above, the flowing water is in contact with the tubular body 11 for rehabilitation, but is prevented from coming into contact with the lining pipe 10 for rehabilitation inserted in the inside thereof. The lining pipe 10 is sufficiently heated and softened from the inner peripheral surface side by the heating steam supplied to the inside thereof, and the shape is restored to the shape of a circular tube, and is pressurized by the pressure of the heating steam and expanded and expanded. Then, it closely contacts the inner peripheral surface of the tubular body 11 for rehabilitation (see FIG. 9).

  Further, when the heating steam generator G is driven and the heating steam is supplied to the pipe rehabilitation lining pipe 10 through the heat medium supply pipe 7, the integrated pipe rehabilitation lining pipe 10 and rehabilitation tubular body 11 are heated. While being heated to a predetermined temperature by the steam and softened, it is pressurized by the pressure of the heated steam, is expanded and expanded, and is in close contact with the inner peripheral surface of the existing pipe K (see FIG. 10).

  At this time, the foam bubbles constituting the heat insulation layer 12 of the tubular body 11 for rehabilitation are compressed, thereby reducing the thickness of the tubular body 11 for rehabilitation. As a result, it is possible to suppress a decrease in the flow path cross-sectional area of the rehabilitating pipe line, and to ensure the tightness of the pipe rehabilitating lining pipe 10 to the existing pipe K.

  Moreover, since the flowing pipe does not come into contact with the pipe lining pipe 10 by the tubular body 11 for rehabilitation, and the temperature of the lining pipe 10 for pipe rehabilitation due to the flowing water is prevented, the finished quality can be ensured. it can.

  The excessive heating steam supplied to the pipe rehabilitation lining pipe 10 is discharged through the heat medium discharge pipe 71, and the internal pressure of the pipe rehabilitation lining pipe 10 is kept constant.

  If the integrated pipe rehabilitating lining pipe 10 and rehabilitating tubular body 11 are heated and pressurized by heating steam for a set time and are brought into close contact with the inner peripheral surface of the existing pipe K, the heating steam generator G is driven. On the other hand, a cooling medium, for example, normal temperature pressurized air is supplied to the lining pipe 10 for pipe rehabilitation through the heat medium supply pipe 7 by driving a blower (not shown). When normal temperature pressurized air is supplied to the pipe rehabilitation lining pipe 10, the pipe rehabilitation lining pipe 10 exchanges heat with the normal temperature pressurized air supplied instead of the heated steam, and is heated by the pressurized air. Cooling while continuing the pressure.

  If the pipe rehabilitation lining pipe 10 is cooled and falls below the set temperature by exceeding the glass transition temperature, the supply of pressurized air is stopped, and then the pipe rehabilitation lining pipe 10 and the rehabilitation tubular body are integrated. 11 is cut along the edge of the existing pipe K. Thereby, the flowing water whose flow in the existing pipe K is prevented from flowing along the lining pipe 10 for pipe rehabilitation and the tubular body 11 for rehabilitation that are in close contact with the inner peripheral surface of the existing pipe K resumes flowing down.

  By adopting the rehabilitation method for the existing pipe K using the pipe rehabilitation lining pipe 10 and the rehabilitation tubular body 11 described above, flowing water flows down the existing pipe K or in an environment where intrusion water is recognized in the existing pipe K. Even so, the pipe rehabilitation lining pipe 10 can be sufficiently heated and pressurized to expand and expand to be brought into close contact with the rehabilitation tubular body 11, and further, the pipe rehabilitation lining pipe 10 and rehabilitation pipe are integrated. Since the tubular body 11 can be heated and pressurized to expand and expand to be brought into close contact with the existing pipe, the existing pipe can be rehabilitated by the pipe rehabilitation lining pipe 10 that ensures the finished quality.

  Here, in inserting the rehabilitating tubular body 11 into the existing pipe K, in addition to reverse insertion, pinching the tip of the rehabilitating tubular body 11 and pulling and pulling the pinched distal end portion may be mentioned. it can.

  In this embodiment, the case where heating steam is used as the heating medium has been described. However, hot air or hot water may be used, and normal temperature pressurized air is used as the cooling medium. May be. Furthermore, although the foam which contains a bubble inside was illustrated as a heat insulation layer, as a bubble, an open cell may be sufficient.

  In the above embodiment, the pipe rehabilitation lining pipe 10 and the rehabilitation tubular body 11 are exemplified as a method of being drawn into the existing pipe K as a separate process, but the pipe rehabilitation lining pipe 10 and the rehabilitation tubular body 11 are The same process may be led into the existing pipe K.

  For example, if the pulling wire 5 is connected to the tip of the pipe rehabilitation lining pipe 10, the winch W is driven to wind up the pulling wire 5, and the rehabilitation tubular body 11 is connected to the pipe rehabilitation lining pipe 10. The laminated sheet is drawn into the existing pipe K while being wound.

  At this time, the distal end portion 11a of the wound tubular body 11 for rehabilitation is temporarily fixed to the pulling wire 5 side. A specific example is shown in FIG. In the step of drawing the pipe lining pipe 10 for rehabilitation into the existing pipe K, the tip part 11a of the tubular body 11 for rehabilitation is preliminarily wound (see FIGS. 11A and 11B), and the rehabilitation member is cut. (Refer FIG.11 (c)).

  Thereafter, the tip of the pipe lining pipe 10 is processed so that the pulling wire 5 can be connected, and the pulling wire 5 and the tip cover 40 are attached (see FIG. 11D). The pulling wire 5 and the tip cover 40 are covered with the distal end portion 11a of the regenerated tubular body 11, and the rehabilitating tubular body 11 is bound by the binding material 43 at the portion of the pulling wire 5 (FIG. 11 (e)), the pulling-in process is performed so that water does not enter between the pipe rehabilitation lining pipe 10 and the rehabilitation tubular body 11.

  In addition, when binding the tip of the tubular body 11 for rehabilitation, it is better to install the water absorbing material 44 in front of the binding location, and to bind the tubular body 11 for rehabilitation 11 in front of the water absorbing material 44 to cover the water absorbing material 44. preferable.

  In this existing pipe rehabilitation method, in the process of drawing the pipe rehabilitation lining pipe 10 into the existing pipe K, water does not enter between the pipe rehabilitation lining pipe 10 and the rehabilitation tubular body 11, and therefore the pipe rehabilitation lining. Insufficient heating of the pipe 10 can be further prevented.

  As described above, according to the present invention, since the existing pipe can be rehabilitated while ensuring the quality, it is possible to rehabilitate even an old existing pipe that has been difficult to rehabilitate due to road conditions. It becomes possible and the social infrastructure can be reconstructed.

One embodiment of the lining pipe for pipe rehabilitation of the present invention is shown, (a) is a sectional view and (b) is an enlarged view schematically showing a part thereof. (A) is process drawing explaining the lining method of the existing pipe using the lining pipe for pipe rehabilitation of this invention, (b) is an expanded sectional view which shows the lining pipe for pipe rehabilitation with an existing pipe. (A) is process drawing explaining the lining method of the existing pipe using the lining pipe for pipe rehabilitation of this invention, (b) is an expanded sectional view which shows the lining pipe for pipe rehabilitation with an existing pipe. (A) is process drawing explaining the lining method of the existing pipe using the lining pipe for pipe rehabilitation of this invention, (b) is an expanded sectional view which shows the lining pipe for pipe rehabilitation with an existing pipe. It is a partial expanded sectional view which shows typically the modification of the lining pipe for pipe rehabilitation of this invention. (A) is a partial cross-sectional perspective view of the tubular body for rehabilitation of this invention, (b) is a cross-sectional perspective view of the state where the lining pipe for pipe rehabilitation is inserted in the tubular body for rehabilitation. (A) is process drawing explaining one Embodiment of the rehabilitation method of the existing pipe | tube of this invention, (b) is an expanded sectional view which shows the lining pipe for pipe rehabilitation with an existing pipe | tube. (A) is process drawing explaining one Embodiment of the rehabilitation method of the existing pipe | tube of this invention, (b) is an expanded sectional view which shows the lining pipe for pipe rehabilitation with an existing pipe | tube. (A) is process drawing explaining one Embodiment of the rehabilitation method of the existing pipe | tube of this invention, (b) is an expanded sectional view which shows the lining pipe for pipe rehabilitation with an existing pipe | tube. (A) is process drawing explaining one Embodiment of the rehabilitation method of the existing pipe | tube of this invention, (b) is an expanded sectional view which shows the lining pipe for pipe rehabilitation with an existing pipe | tube. (A)-(e) is the schematic which each shows the connection method of the front-end | tip part of the lining pipe for pipe rehabilitation, and the wire for traction in the rehabilitation method of the existing pipe | tube of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Line rehabilitation pipe 2 Pipe body 3 Heat insulation layer 4 Impervious layer 5 Pulling wire 6 Plug 7 Heat medium supply pipe 10 Pipe rehabilitation lining pipe 11 Rehabilitation tubular body 12 Heat insulation layer 13 Impermeable layer 14 Protective layer 40 Tip cover 71 Heat medium discharge pipe G Heating steam generator W Winch K Existing pipe M1, M2 Manhole S Screen

Claims (3)

In an existing pipe rehabilitation method for fixing a pipe rehabilitation lining pipe and a rehabilitation tubular body to the inner surface of an existing pipe embedded in the ground ,
In the tubular body for rehabilitation, a laminated sheet is formed in a tubular shape, and is formed of a thermoplastic resin and has an inner heat insulating layer having a heat insulating property, and a water shielding property formed of a thermoplastic resin and provided on the outer side of the heat insulating layer. an intermediate impermeable layer with, provided outside the impermeable layer consists of a protective layer that reinforces the impermeable layer,
The rehabilitation for the tubular body is inserted into the existing pipe, then the pipe rehabilitation lining pipes folded diameter smaller than the inner diameter of the formed by a thermoplastic resin wherein the existing pipe, after insertion into the tubular body for the rehabilitation,
Expanding and expanding the diameter by expanding the pipe lining pipe by heating and pressurizing, and bringing the pipe lining pipe into close contact with the tubular body for retreading,
Then, after close contact with the inner circumferential surface of the existing pipe is expanded diameter by applying further heat and pressure to the pipe rehabilitation lining pipe and said rehabilitating a tubular body is integral, the pipe rehabilitation which was restored expanded rehabilitation method of the existing pipe, characterized in that fixed to the inner peripheral surface of the existing pipe by the use lining pipe and said rehabilitating a tubular body to cool while pressing. In an existing pipe rehabilitation method for fixing a pipe rehabilitation lining pipe and a rehabilitation tubular body to the inner surface of an existing pipe embedded in the ground ,
In the tubular body for rehabilitation, a laminated sheet is formed in a tubular shape, and is formed of a thermoplastic resin and has an inner heat insulating layer having a heat insulating property, and a water shielding property formed of a thermoplastic resin and provided on the outer side of the heat insulating layer. an intermediate impermeable layer with, provided outside the impermeable layer consists of a protective layer that reinforces the impermeable layer,
The existing pipe, when inserting the pipe rehabilitation lining pipes folded diameter smaller than the inner diameter of the formed by a thermoplastic resin wherein the existing pipe is provided between the pipe rehabilitation lining pipe and the existing pipe After inserting the rehabilitation tubular body in the same step, the pipe rehabilitation lining pipe is inflated and expanded by heating and pressurizing, so that the rehabilitation pipe lining pipe is in close contact with the rehabilitation tubular body,
Then, after inflating expanded into close contact with the inner peripheral surface of the existing pipe by applying further heat and pressure to the pipe rehabilitation lining pipe and said rehabilitating a tubular body, the tubular rehabilitation lining pipes and were restored expanded rehabilitation method of the existing pipe, characterized in that fixed to the inner peripheral surface of the existing pipe by cooling while pressing the retread a tubular body. In rehabilitation method of the existing pipe according to claim 2, in the step of pulling the pipe rehabilitation lining pipe into the existing pipe, advance the rehabilitation for tubular body of the distal end portion so as to left over the roll up, lining for the pipe rehabilitation cutting the pipe, then attach the traction wire and the tip cover to the tip portion of the pipe rehabilitation lining pipe, to the traction wire and the tip cover, the front end portion of the rehabilitating a tubular body which had I sow covered by, rehabilitation methods of the existing pipe, characterized by bundling the distal end of the rehabilitation for tubular body by strapping material in the tow wire.

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