JP5856519B2 - Lining method - Google Patents

Description

The present invention relates to a lining construction method, in particular for example, to rehabilitate the existing pipe by inserting a lining tube into the existing pipe, about the lining construction method.

  An example of a new lining method proposed by the present applicants is disclosed in Patent Document 1. In the technique of this Patent Document 1, a reinforcing member called a coil molded body is laid in an aged existing pipe so as to be in close contact with the inner surface of the existing pipe, and a known lining pipe is inserted inside the coil molded body, The lining pipe is laid so that the outer surface is in close contact with the inner surface of the coil molded body.

The technique of Patent Document 1 has an advantage that the strength of the lining pipe does not have to be so large because the coil molded body functions as a reinforcing member.
JP2011-158087 [F16L1 / 00]

  In the technique of Patent Document 1, since a relatively short fixed-length coil molded body is used, there is a possibility that it takes time to construct, in particular, to lay the coil molded body in an existing pipe.

Another object of the present invention is to provide novel, lining construction method.

Another object of the invention is excellent in workability, it is to provide a lining construction method.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

The first invention is a lining method in which a coil molded body is laid as a reinforcing material in an existing pipe whose inlet is connected to a manhole, and the existing pipe is rehabilitated by laying a lining material inside the coil molded body. Te, it has a greater or equal to the outer diameter than the inner diameter of the existing pipe, and to have a rigidity resistant external pressure strength is obtained for the required embedded earth pressure as rehabilitating pipe together with the strength of the lining material, the elongated coil preparation step of preparing a molded body, and while rotating the distal end of the coil molded elongated in the winding direction of those said coil molded, saw including a pull step of pulling the existing pipe from the inlet through the manhole from ground, retraction steps, including performed in the manhole, the regulatory step of regulating the pull-in amount of the coil molded from the inlet in accordance with the rotation of the tip to the manhole , It is a method of lining.

In the first invention, for example, by using the retractor (20) as in the embodiment, the tip of the long coil molded body (16) (the wire 16a) is rotated in the winding direction of the coil molded body. The coil compact is reduced in diameter. Since the diameter of the coil formed body is reduced, the friction between the coil formed body and the existing pipe is reduced as much as possible. Therefore, by moving the retractor (20) in that state, the coil formed body is moved from the ground to the manhole. Then, it can be smoothly drawn into the existing pipe from the entrance . Therefore, even if it is a continuous long coil molded object, it can draw in in an existing pipe | tube efficiently. In the pulling-in step, a regulating step is further performed in the manhole, which regulates the pulling amount of the coil molded body from the inlet to the manhole accompanying the rotation of the tip.

A second invention is a lining method according to the first invention, wherein the regulating step includes a step of allowing the coil molded body to pass through a wire passing portion of a rectifying plate provided in the manhole .

In 2nd invention, the baffle plate (40) of an Example performs a regulation step, for example. For example, a rectifying plate (40) is provided at an appropriate position in a manhole, and on the other hand, the tip of the coil molded body (16) is rotated through the wire passing portion of the rectifying plate and coiled from the inlet through the manhole. Pull the body into the existing pipe. When the tip of the coil molded body is rotated in the winding direction, the coil molded body rotates in that direction as a whole. Since the coil molded body is formed in a spiral shape, the coil molded body advances forward by exceeding one rectifying plate (40) interposed between the wire rods, for example, as in the embodiment. Therefore, when the coil molded body is pulled into the existing pipe, the pull-in amount can be regulated.

3rd invention depends on 1st or 2nd invention, and a preparation step is a lining construction method which connects a regular coil molded object and forms a long coil molded object.

  In the third invention, for example, the long coil molded body (16) is formed by connecting the fixed coil molded bodies (16A) using the coupler (52) of the embodiment. Therefore, it is possible to share a fixed-size coil molded body made for the purpose of using a standard-sized coil molded body, and expect cost reduction. In addition, if a regular coil molded body is made available, the coil molded body can be easily handled and transported, and workability is improved. Furthermore, since it is sufficient to connect a necessary number of coil-formed bodies of a fixed length according to the length of the existing pipe, there is little material loss, and cost can be reduced in that respect.

  A fourth invention is dependent on any one of the first to third inventions, and further includes the step of preparing a retractor having a moving means in the tube axis direction and a rotating means for rotating the coil molded body around the tube axis. The pulling-in step includes a lining method in which the leading end of the coil molded body is fixed to the rotating means and pulled in while rotating.

  In the fourth invention, for example, it has a main body (22) and is attached to, for example, wheels (24, 26) as moving means provided in the main body and a rotating shaft (28) extending from the main body as rotating means. A retractor (20) having a rotating body (30) is prepared, and the retractor is arranged in an existing pipe. Then, when the tip of the wire rod (16a) of the coil molded body (16) is held by the rotating means, for example, the rotating body and the rotating means is rotated, the tip is rotated in the winding direction of the coil molded body, and the coil molded body is The diameter is reduced. According to the fourth invention, the coil molded body can be easily drawn into the existing pipe by moving the drawing-in machine in the pipe axis direction while rotating the rotating means.

The fifth invention is a lining method in which a coil molded body is laid as a reinforcing material in an existing pipe whose inlet is connected to a manhole, and the existing pipe is rehabilitated by laying a lining material inside the coil molded body. Te, it has a greater or equal to the outer diameter than the inner diameter of the existing pipe, and to have a rigidity resistant external pressure strength is obtained for the required embedded earth pressure as rehabilitating pipe together with the strength of the lining material, the elongated coil A preparation step for preparing a molded body, a preparation step, a first drawing step for drawing a long coil molded body into the manhole from the ground while rotating the coiled body in the winding direction, and a tip of the coil molded body drawn into the manhole, viewed free from the inlet while rotating in the winding direction of the coil molded the second retracting step of pulling the existing pipe, the second retracting step, manholes Dude performed, from the inlet caused by the rotation of the tip including a restriction step for restricting the pull-in amount of the coil molded into the existing pipe, a method of lining.

In the fifth invention, in the first pulling step, the coil molded body is pulled into the manhole (14) from the ground while rotating the long coil molded body (16) in the winding direction, and the second pulling step For example, in the same manner as in the pulling-in step of the first invention, the coil molded body is pulled into the existing pipe from the manhole while restricting the pull-in amount . According to 5th invention, a continuous process is attained so that a coil molded object may be drawn in to a manhole, and then it may be drawn in to an existing pipe.

6th invention is dependent on 5th invention, and a regulation step is a lining construction method including the step which makes a coil molded object pass the wire rod passage part of the baffle plate provided in the manhole .

In the sixth invention, for example, the rectifying plate (40) of the embodiment provides the rectifying plate (40) at an appropriate position such as an entrance of a manhole, an inside of a manhole and / or an entrance of an existing pipe. Therefore, by the action of the rectifying plate described above for the second invention, when the coil molded body is pulled into the manhole in the first pulling step and / or in the second pulling step, the coil molded body is pulled into the existing pipe. In some cases, the pull-in amount of the coil molded body can be regulated.

The seventh invention is a lining system in which a coil molded body is laid as a reinforcing material in an existing pipe whose inlet is connected to a manhole, and a lining material is laid inside the coil molded body to rehabilitate the existing pipe. The coil molded body has an outer diameter that is larger than or equal to the inner diameter of the existing pipe, and has a rigidity that provides an external pressure strength against the buried earth pressure required as a rehabilitation pipe line in combination with the strength of the lining material. A retractable means for passing the manhole from the ground and pulling it into the existing pipe from the ground while rotating the tip of the long coil formed body in the winding direction of the coil formed body, and the manhole. The lining system is provided with a regulating means for regulating the amount of the coil molded body drawn from the manhole to the existing pipe as the tip rotates. .

In the seventh invention, for example, by using the retractor (20) as in the embodiment, the tip of the long coil molded body (16) (the wire 16a) is rotated in the winding direction of the coil molded body. The coil compact is reduced in diameter. Since the diameter of the coil formed body is reduced, the friction between the coil formed body and the existing pipe is reduced as much as possible. Therefore, by moving the retractor (20) in that state, the coil formed body is moved from the ground to the manhole. Then, it can be smoothly drawn into the existing pipe from the entrance. Therefore, the coil molded body can be efficiently drawn into the existing pipe.

An eighth invention is a lining system according to the seventh invention, wherein the regulating means includes a current plate provided in the manhole and having a wire passing portion through which the coil molded body passes.

In the eighth invention, for example, the current plate (40) is provided at an appropriate position in the manhole, and on the other hand, the manhole is rotated while rotating the tip of the coil molded body (16) through the wire passage portion of the current plate. Then, the coil molded body is drawn into the existing pipe from the inlet. For example, when the tip of the coil molded body (16) is rotated in the winding direction, the coil molded body as a whole rotates in the winding direction. Since the coil molded body is formed in a spiral shape, for example, the rectifying plate (40) inserted between the wire members of the coil molded body is advanced by one pitch over one rotation as in the embodiment. The rectifying plate (40) of the embodiment functions as a regulating means.

A ninth aspect of the present invention is the lining system according to the seventh or eighth aspect of the lining system, wherein a coil molded body is laid in an existing pipe and a lining material is laid inside the coil molded body to rehabilitate the existing pipe. A retractor to be used, comprising a moving means in the tube axis direction and a rotating means for rotating the coil molded body around the tube axis, and fixing the tip of the coil molded body to the rotating means while rotating the coil in the existing pipe This is a retractor that retracts the molded body.

  In the tenth invention, the retractor (20) has, for example, a main body (22), for example, wheels (24, 26) as moving means provided on the main body, and rotation extending from the main body as rotating means. It has a rotating body (30) attached to a shaft (28). In the embodiment, the retractor is arranged in an existing pipe, and when the rotating means, for example, the rotating body holds the tip of the wire (16a) of the coil molded body (16) and rotates the rotating means, the leading end is the coil molded body. The coil molded body is reduced in diameter in the winding direction. Therefore, the coil molded body can be easily drawn into the existing pipe by moving the drawing machine in the pipe axis direction while rotating the rotating means.

  According to the present invention, since the coil molded body can be easily laid in the existing pipe, the old pipe can be rehabilitated efficiently.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

FIG. 1 is a cross-sectional view showing a rehabilitation pipeline constructed by a lining method according to one embodiment of the present invention. 2 is an illustrative view showing an example of a coil molded body that can be used in the embodiment of FIG. 1, FIG. 2 (a) is a plan (side) view, and FIG. 2 (b) is a wire rod of the coil molded body. It is sectional drawing. FIG. 3 is an illustrative view showing how the coil molded body of FIG. 2 is drawn into the existing pipe. 4 is an illustrative view illustrating the current plate in the embodiment of FIG. 3, FIG. 4 (a) shows an example of a circular current plate, FIG. 4 (b) shows an example of a cross-shaped current plate, 4 (c) shows an example of a triangular current plate. FIG. 5 is an illustrative view showing the function (action) of the current plate. FIG. 6 is an illustrative view showing, in an enlarged manner, the vicinity of the existing pipe entrance in order to show the structure of the pressing roller and the sandwiching roller pair in the embodiment of FIG. FIG. 7 is an illustrative view showing a function (action) of the pair of sandwiching rollers shown in FIG. FIG. 8 is an illustrative view showing one example of a mounting structure of the presser roller and the sandwiching roller pair shown in FIG. FIG. 9 is an illustrative view showing a state in which a coil molded body is laid in the existing pipe over the entire length of the existing pipe according to the embodiment of FIG. FIG. 10 is a cross-sectional view showing an example of a lining pipe laid inside the coil molded body. FIG. 11 is a plan (side) view showing another example of a coil molded body that can be used in the embodiment of FIG. 12 is a plan (side) view showing another example of a coil molded body that can be used in the embodiment of FIG. FIG. 13 is a plan (side) view showing another example of a coil molded body that can be used in the embodiment of FIG. FIG. 14 is an illustrative view illustrating a method of making a long coil molded body usable in the embodiment of FIG. 1 by connecting a fixed coil molded body. FIG. 15 is an illustrative view showing a connected state in the embodiment of FIG. 14.

  Before describing the lining method of the embodiment according to the present invention, the background art described above will be described to the extent necessary for facilitating the understanding of the present invention.

  In the rehabilitation pipe 10 of FIG. 1, the existing pipe 12 is embedded in the ground between the manhole 14 and the manhole 14, and the rehabilitation pipe 10 including the existing pipe 12 is a new lining proposed in the background art. According to the construction method, the coil molded body 16 is laid in the existing pipe 12 so that the outer surface of the coil molded body 16 is in close contact with the inner surface of the existing pipe 12, and then the outer surface is the coil molded body 16 inside the coil molded body 16. It is formed by laying the lining pipe 18 so as to be in close contact with the inner surface of the lining.

  In order to form such a rehabilitation pipeline 10, it is necessary to lay the coil molded body 16 in the existing pipe 12, but in the background art method, the axial length is, for example, 4-5 m, In view of the use of a relatively short standard coil formed body, when the coil formed body 16 is laid on the entire length (for example, 50 m) of the existing pipe 12 between the manholes 14 as shown in FIG. Must be sequentially drawn into the existing pipe 12, and then the coil molded bodies must be connected to each other. Therefore, it takes time to lay the coil molded body 16 in the existing pipe 12. In the following embodiments, the time for laying the coil molded body 16 in the existing pipe 12 can be shortened.

  As the existing pipe 12 to which the present invention can be applied, for example, a water and sewage pipe, a gas pipe, a communication cable protection pipe, a power cable protection pipe, or the like can be considered, and the types of pipes are reinforced concrete pipes, ceramic pipes, cast iron pipes. , Synthetic resin pipes such as steel pipes and PVC pipes.

  As shown in FIG. 2, the coil molded body 16 used in the embodiment of the present invention is made of a rigid wire rod 16a having a rectangular cross section, the long side of the rectangle being arranged in the radial direction of the existing pipe 12, and the short side being By being spirally wound on a winding core (not shown) so as to be arranged in the axial direction of the existing pipe 12, it is formed into an air core cylindrical shape.

  As shown in FIG. 2A, the outer diameter D of the coil molded body 16 is equal to or slightly equal to the inner diameter d of the existing pipe 12 so that the outer surface of the coil molded body 16 is in close contact with the inner surface of the existing pipe 12. Is set to a large value. Further, in this embodiment, the width W and the thickness T of the wire 16a shown in FIG. 2B can be designed to arbitrary dimensions. As an example, if the nominal diameter of the coil molded body 16 is 450 mm, W = 13 mm and T = about 6.5 mm.

  The winding pitch of the wire 16a, that is, the distance between the centers of the adjacent wire 16a is set to be equal to or substantially equal to the width W of the wire 16a. Therefore, in the coil molded body 16 of this embodiment, the adjacent wire 16a It is wound so that is closely attached.

  The material of the wire 16a of the coil molded body 16 is a material having high rigidity, for example, a metal such as an aluminum alloy, steel or stainless steel, a synthetic resin, GFRP (glass fiber reinforced plastic), CFRP (carbon fiber reinforced plastic), or the like. The fiber reinforced plastics can be considered. However, the rigidity required for the wire 16a of the coil molded body 16 is determined by the relationship with the external pressure resistance against the buried earth pressure, and the strength necessary for the rehabilitation pipe line 10 is obtained together with the strength of the lining pipe 18. Yes.

  With reference to FIG. 3, the Example of the construction method which draws in the coil molded object 16 from the manhole 14, and lays in the existing pipe 12 is described.

  In order to draw the coil molded body 16 into the existing pipe 12, first, the retractor 20 is disposed in the existing pipe 12. The retractor 20 has a hollow bottomed cylindrical main body 22 made of, for example, a metal such as iron. The main body 22 has a pair of wheels 24 and 26 on the front and rear sides of the existing pipe 12. It is provided to be rotatable in the axial direction. However, two or more wheels 24 and 26 may be provided in the circumferential direction of the main body 22, for example, every 90 °.

  Although not shown, a motor is provided in the main body 22, and a rotating shaft 28 of the motor projects rearward from the main body 22. A disc-shaped rotating body 30 is attached to the tip of the rotating shaft 28. A fixed portion or holding portion 32 indicated by a dotted line in FIG. The holding portion 32 is a mechanism for holding the tip of the coil molded body 16 to be introduced fixedly on the inner periphery of the rotating body 30, and a holding portion having an arbitrary structure can be used. For example, a presser fitting (not shown) that can be displaced in the radial direction is provided on the inner periphery of the rotating body 30, and the wire 16a at the tip of the coil molded body 16 is sandwiched and held between the presser fitting and the outer periphery. Alternatively, a structure in which a female screw is formed on the inner periphery of the rotating body 30, a bolt (not shown) is screwed to the female screw, and the wire rod at the tip is fixed with the bolt is considered.

  When a motor (not shown) is rotated in a state where the wire rod at the tip of the coil molded body 16 is held by the holding portion 32, the tip of the coil molded body 16 is drawn in the winding direction of the coil molded body 16, and the coil molding is performed. The body 16 rotates in that direction.

  Such a retractor 20 may be of a self-propelled type. In that case, it is necessary to apply a driving force to any one or more of the wheels 24 and / or 26. As a drive source, the rotational force of a motor for rotating the rotating body 30 may be used, or a drive source different from the motor may be provided in the main body 22. In any case, the retractor 20 can be self-propelled forward in the tube axis direction by the rotational driving force applied to the wheels 24 and / or 26.

  However, the retractor 20 may not be self-propelled. In this case, if the circular hook metal fitting 34 is fixed to the front surface of the main body 22 of the retractor 20 and the hook 38 of the wire 36 is hooked on the metal fitting 34 and the wire 36 is pulled, the retractor 20 is manually operated. It can be moved forward.

  When such a retractor 20 constitutes a lining system, it functions as a retracting means that retracts the tip of the coil molded body into the existing pipe while rotating the coil molded body in the winding direction.

  In this embodiment, the axial length of the coil molded body 16 drawn into the existing pipe 12 is, for example, 50 m if it is the length of the portion of the existing pipe 12 to be rehabilitated and the total length between the manholes 14 in FIG. Such a long coil molded body 16 is prepared as one continuous long coil molded body, but in some cases, as will be described later, a relatively short length (axial length is 4-5 m). Before the coil molded body is drawn into the existing pipe 12, a required number may be connected and created on the ground.

  With reference to FIG. 3, the tip (the wire) of the long coil molded body 16 is held by the holding portion 32 of the above-described rotary body 30 of the retractor 20, and the rotary body 30 is wound around the coil molded body 16. Rotate in the turning direction. If it does so, the front-end | tip of the coil molded object 16 will be drawn in the winding direction, and the magnitude | size of the radial direction of the coil molded object 16 will become small as shown in FIG. Therefore, if the retractor 20 is moved forward in this state, the frictional resistance due to the contact between the outer surface of the coil molded body 16 and the inner surface of the existing pipe 12 is reduced, and the coil molded body 16 smoothly enters the existing pipe 12. Be drawn.

  However, since the coil molded body 16 is provided with a later-described rectifying plate 40 at the entrance of the existing pipe 12, the coil molded body 16 does not enter the existing pipe 12 at a stretch even if the retractor 20 is advanced. Absent. That is, when the coil molded body 16 is drawn from the entrance of the existing pipe 12, the rectifying plate 40 provided at the entrance of the existing pipe 12 regulates the pull-in amount of the coil molded body 16.

  More specifically, the rectifying plate 40 is made of, for example, a plate made of metal, plastic, wood, rubber or the like, and has a disc shape as a whole as shown in FIG. Is set to be equal to or larger than the inner diameter of the coil molded body 16, preferably about the same as the outer diameter D, and fixed to the entrance of the existing pipe 12 by any means such as screwing. A wire passing portion 42 is formed in the rectifying plate 40 by a notch or a gap. The wire passing portion 42 is set to a size that allows the wire 16a of the coil molded body 16 to enter the existing pipe 12 through the coil molded body 16 but does not allow the coil molded body 16 itself to pass therethrough.

  The shape of the rectifying plate 40 may be the shape shown in FIGS. 4B and 4C. The overall shape of the rectifying plate 40 in FIG. 4B is a cross or a + (plus) shape, and at least a part of the rectifying plate 40 is equal to or larger than the inner diameter of the coil molded body 16, preferably about the same as the outer diameter. Is set to a predetermined length L. In the rectifying plate 40 of FIG. 4B, four wire rod passing portions 42 are formed, and the wire rod 16a of the coil molded body 16 is drawn into the existing pipe 12 through any one of them.

  4C is formed in a triangular shape as a whole, and in this case, a gap between each side of the triangle and the inner diameter of the existing pipe 12 functions as the wire passing portion 42. In the triangular current plate 40, the length of each side is set to a passing length that can fix the current plate 40 to the entrance of the existing pipe 12. Also in the rectifying plate 40 of FIG. 4C, the wire 16a is set so as to pass through any one of the three wire passing portions 42.

  FIG. 5 illustrates the function (action) of the rectifying plate 40. When the tip of the coil molded body 16 is rotated in the winding direction by the rotating body 30 of the retractor 20, the coil molded body 16 is also entirely moved. Rotate in the winding direction. When the coil molded body 16 makes one revolution, the wire material of the turn exceeds the rectifying plate 40, so that the coil molded body 16 as a whole is drawn into the existing pipe 12 through the wire material passing portion 42 for one turn (one pitch). It is. That is, since the rectifying plate 40 that prevents the passage of the entire coil molded body 16 but allows the wire 16a to pass is provided at the entrance of the existing pipe 12, the coil molded body 16 is provided for each turn (one pitch). In addition, the coil molded body 16 can be prevented from entering the existing pipe 12 at once. Therefore, the wire 16a of the coil molded body 16 is not twisted or entangled. As described above, the rectifying plate 40 provided at the entrance of the existing pipe 12 can be expected to have a quantitative pull-in effect of the coil molded body 16 through the wire passing portion 42 and a so-called suppression of the so-called rampage of the coil molded body 16.

  Further, in the embodiment of FIG. 3, as described above, one or more rectifying plates 40 having the wire passing portions 42 may be provided in the bent portion where the coil molded body 16 bends from the vertical state to the horizontal state in the manhole 14. it can. As with the current plate at the entrance of the existing pipe 12, the current plate 40 provided at the bent portion also has the effect of quantitatively drawing the coil molded body 16 through the wire passing portion 42 and suppressing the so-called rampage of the coil molded body 16. Can be expected.

  However, in this embodiment, the rectifying plate 40 provided in the bent portion has a wedge shape in cross section, thereby trying to effectively prevent the deformation of the coil molded body 16 in the bent portion. Similarly, it may be a simple flat plate rectifying plate.

  Further, in the embodiment of FIG. 3, one or more rectifying plates 40 can be provided in a vertical portion where the coil molded body 16 is sent in the vertical direction in the manhole 14. In addition to the above-described quantitative pull-in effect and suppression of rampage, the current plate 40 provided in the vertical portion suppresses damage and suppresses the coil molded body 16 from being stretched or deformed by its own weight in the manhole 14. The effect can also be expected.

  When such a rectifying plate 40 constitutes a lining system, the rectifying plate 40 functions as a regulating unit that regulates the amount of the coil molded body that is pulled in as the leading end of the coil molded body is rotated by the drawing unit. That is, as described above, the rectifying plate 40 cannot be moved beyond the rectifying plate 40 even if the coil forming body 16 is moved in the tube axis direction, but the coil forming body 16 is rotated around the tube axis. Then, the rectifying plate 40 executes a regulating step or functions as a regulating means in that the coil molded body 16 can exceed the rectifying plate 40 by the amount of rotation.

  Note that the rectifying plate 40 may be provided at the entrance of the manhole 14 in the same manner as the above-described vertical rectifying plate.

  In the embodiment of FIG. 3, as shown in a partially enlarged view in FIG. 6, a roller 44 and a sandwiching roller pair 46 are further provided at the entrance of the existing pipe 12. The roller 44 is provided at a position in contact with the outer surface of the wire 16 a of the coil molded body 16 before being drawn into the existing pipe 12 so as to be rotatable by a shaft (not shown). The roller 44 is rotated while contacting the outer peripheral surface of the coil molded body 16 as the coil molded body 16 is rotated by the retractor 20. And the roller 44 is provided in the position which presses the outer peripheral surface of the coil molded object 16 a little inside radial direction. When the outer peripheral surface of the coil molded body 16 hits the inner surface of the existing pipe 12 or the bottom of the manhole 14, the friction increases. In this embodiment, the roller molded body 16 receives a force so that the coil molded body 16 is slightly lifted. The effect of reducing friction can be expected.

  Apart from the rollers 44, a pair of sandwiching rollers 46 is provided behind the current plate 40 near the entrance of the existing pipe 12. The sandwiching roller pair 46 can sandwich the inner surface and the outer surface of one or two or more wire rods 16a of the coil molded body 16 with the driving roller 46a and the driven roller 46b. As shown in FIG. 7, when the driving roller 46a is rotated in a state where the wire 16a is sandwiched between the pair of sandwiching rollers 46, the wire 16a is pushed in the length direction of the wire 16a by the driving force of the driving roller 46a. Eventually, the rotation of the coil molded body 16 by the retractor 20 is promoted. Therefore, the coil molded body 16 can be drawn into the existing pipe 12 more smoothly. When the laying distance of the coil molded body 16 is short, the friction caused by the coil molded body 16 is not so large, and in some cases, the pinching roller pair 46 may not be provided. However, if the laying distance is increased, the friction reduction effect by the pinching roller pair 46 is effectively exerted. Therefore, it is preferable to provide the pinching roller pair 46.

  Note that both the roller shaft of the roller 44 and the two roller shafts of the pair of sandwiching rollers 46 are mounted on a donut-shaped mounting plate 48 as shown in FIG. It is fixed to the entrance of the tube 12 by any means.

  As shown in FIG. 3, two pinching roller pairs 50 and 50 can be installed outside the manhole 14, that is, on the ground, using a donut-shaped attachment plate similar to the attachment plate 44 shown in FIG. These sandwiching roller pairs 50 and 50 also basically have the same function and effect as the sandwiching roller pair 46, so that the function (operation) for improving the workability when the coil molded body 16 is drawn into the manhole 14 from the ground. Fulfill. However, it is necessary to synchronize the pair of sandwiching rollers 50 and 50 on the ground and the pair of sandwiching rollers 46 at the entrance of the existing pipe 12. When the feeding amount of the coil molded body 16 by the sandwiching roller pair 50 and 50 is larger than the feeding amount (take-up amount) of the coil molded body 16 by the sandwiching roller pair 46, the coil molded body 16 bumps in the manhole 14 and is small. As a result, an imbalance such as the coil molded body 16 being pulled in the manhole 14 may occur, which may hinder the coil molded body 16 from being pulled into the existing pipe 12.

  In addition, when the pinching roller pair 50, 50 is provided outside the manhole 14, that is, on the ground, the pinching roller pair 46 provided behind the current plate 40 near the entrance of the existing pipe 12 may be omitted.

  Referring to FIG. 9, the rotating body 30 of the retractor 20 is rotated as described above, and the retractor 20 is advanced so that the coil molded body 16 is stably pulled into the existing pipe 12 one pitch at a time. be able to. The drawing operation of the coil molded body 16 into the existing pipe 12 is continued, and the drawing machine 20 reaches the manhole 14 forward in the traveling direction. In this state, the coil molded body 16 that has not yet been drawn into the existing pipe 12 remains in the manhole 14 at the rear side, that is, at the entrance side of the existing pipe 12. However, if the rotation of the rotary body 30 of the retractor 20 is stopped, the rotational force applied to the tip of the coil molded body 16 is eliminated, and the wire rod is removed from the pinching roller pair 46 as necessary, the rear end of the coil molded body 16 The coil molded body 16 is sequentially expanded in diameter from the tip, that is, from the distal end side held by the rotating body 30, and the remaining portion of the coil molded body is moved forward from the distal end side of the coil molded body 16 as the diameter increases. A contracting force is generated. Therefore, the terminal portion of the coil molded body 16 remaining in the manhole 14 is sequentially drawn into the existing pipe 12, and finally a part (terminal) of the coil molded body 16 remaining in the rear side (left side) manhole 14. Part) also enters the existing pipe 12 completely. Thereafter, the tip of the coil molded body 16 held by the holding portion 32 of the rotating body 30 is released. Then, over the entire length of the existing tube 12, as shown in FIG. 9, the coil is formed in the existing tube 12 over the entire length of the existing tube 12 so that the outer surface of the coil molded body 16 is along the inner surface of the existing tube 12. A body 16 is laid.

  In the embodiment of FIG. 3, a friction reducing sheet (not shown) may be laid on the inner surface of the existing pipe 12, and then the coil molded body 16 may be drawn. Then, since the friction reducing sheet is interposed between the inner surface of the existing pipe 12 and the outer surface of the coil molded body 16, it is possible to reduce the friction when the coil molded body 16 is drawn.

  Further, in consideration of the moving speed in the pipe axis direction (determined by the regulating action by the regulating means, that is, the rectifying plate 40) that the coil molded body 16 advances as the rotating body 30 rotates, the retractor 20 moves in the pipe axis direction. It is desirable to synchronize the speed and the rotation means, that is, the rotation speed of the rotating body 30 to some extent. Then, since the moving speed of the retractor 20 and the rotational speed of the rotating body 30, that is, the traveling speed of the coil molded body 16 are balanced, it is possible to prevent an excessive force from acting on the coil molded body 16 and the retractor 20. it can. For example, for each rotation of the rotating body 30, the retractor 20 is moved in the tube axis direction by one pitch of the coil molded body 16.

  As shown in FIG. 9, after the coil molded body 16 is laid in the existing pipe 12, it is next necessary to lay the lining pipe 18 on the inner surface of the coil molded body 16.

  In this embodiment, as shown in FIG. 10, the lining pipe 18 is a reduced diameter pipe having a substantially heart shape in cross section in which a part in the circumferential direction is pushed by diameter reduction processing. This substantially U-shaped pushed portion is referred to as a pushed portion 50. The constituent material of the lining pipe 18 is a synthetic resin (polyethylene, polybutene, polypropylene, nylon, vinyl chloride, etc.) or fiber reinforced plastic. Here, an example of polyethylene is shown.

  The lining pipe 18 is restored to a cylindrical shape by being heated to a predetermined temperature and pressurized, and forms a lining pipe 18 that is substantially in close contact with the inner surface of the coil molded body 16 as will be described in detail later. The lining pipe 18 is set so that the outer diameter when restored is approximately the same as the inner diameter of the coil molded body 16.

  Since the lining pipe 18 can be manufactured by a conventionally known method, a detailed description of the manufacturing method is omitted. Simply put, a straight tube extruded with a predetermined diameter is heated to a predetermined temperature in the range from the softening point to the melting point (in this embodiment, for example, about 100 ° C.), The indented portion 50 is formed by reducing the diameter using a roller or the like. Accordingly, by heating and pressurizing again to a temperature not lower than the softening point and not higher than the melting point, the pushing portion 50 is returned to the outer surface side and restored to a predetermined shape (cylindrical shape or the like).

  That is, the lining pipe 18 is inserted into the coil molded body 16 previously laid in the existing pipe 12. Specifically, although not shown in the drawings, a pulling wire is inserted into the coil molded body 16 and the pulling wire is connected to the lining pipe 18 on the entrance (rearward direction) side of the existing pipe 12. Then, the pulling wire is wound up with a winch, and the lining pipe 18 is inserted until the tip of the lining pipe 18 reaches the outlet of the existing pipe 12 (forward in the traveling direction).

  Next, steam or hot water is supplied into the lining pipe 18 and then pressurized to a predetermined pressure to form the lining pipe 18 in the coil molded body 16. Specifically, the lining pipe 18 is restored to a perfect circle or a substantially perfect circle that is sufficiently close to a true circle by being heated and applied with internal pressure. Then, the entire outer peripheral surface of the restored lining pipe 18 is brought into close contact with the entire inner surface of the coil molded body 16. As a result, the rehabilitation pipe line 10 is formed over the entire length of the existing pipe 12 as shown in FIG.

  In the lining method of FIG. 3 embodiment, the coil molded body 16 is interposed between the inner surface of the existing pipe 12 and the outer surface of the lining pipe 18. For this reason, it is possible to shorten the time for restoring the lining pipe 18 to a cylindrical shape by giving the coil molded body 16 an external pressure strength against the buried earth pressure and reducing the thickness of the pipe wall of the lining pipe 18. it can. That is, according to this lining construction method, the time for forming the lining pipe 14 can be shortened. Further, by reducing the thickness of the tube wall of the lining pipe 18, the weight of the lining pipe 18 is reduced by that amount, so that the lining pipe 18 can be easily transported and handled. Therefore, it is excellent in workability.

  Furthermore, in this embodiment, since the diameter of the coil molded body 16 is reduced when retracted into the existing pipe 12, the coil molded body 16 smoothly smoothes the bent pipe portion and the stepped portion (none of which are shown) of the existing pipe 12. Can pass through. That is, according to this embodiment, the coil molded body 16 is easily inserted into the existing pipe 12.

  In the above-described embodiment, the coil molded body 16 having a rectangular cross section of the wire 16a is used. However, the coil molded body 16 is formed by winding a wire 16a having a circular cross section spirally as shown in FIG. Furthermore, as shown in FIG. 12, the wire 16a having a semicircular cross-sectional shape may be spirally wound.

  Further, in the above-described embodiment, the pitch of the coil molded body 16 is set to be the same as the width W of the wire 16a, and the wire 16a is wound so that the adjacent wires are in close contact (not spaced apart). As shown in FIG. 13, the wire 16a may be wound with an interval between adjacent wires.

  In the embodiment of FIG. 3, the long coil molded body 16 is directly pulled into the existing pipe 12, so that the coil molded body can be efficiently pulled into the existing pipe and laid. However, the long coil molded body 16 may be one in which a single wire 16a is continuously spirally wound, or a relatively short standard length as shown in FIGS. The long coil molded body 16 may be formed by connecting the coil molded body 16 </ b> A with the connector 52. When the long coil molded body 16 is formed by connecting the fixed coil molded body 16A, the connecting work may be performed on the ground, but the manhole 14 on the side (the left side in FIG. 1) to which the coil molded body 16 is fed. You may perform a connection operation in the inside.

  As shown in FIGS. 14 and 15, the coupling tool 52 as the coupling means is formed in a socket shape having connection portions 52 a at both ends thereof. The connection portion 52a has, for example, a receiving structure. When the coil molded bodies 16A are connected to each other, the end portions of the wire members 16a of the coil molded body 16A are inserted into the receiving ports and joined together. .

  However, any other means can be adopted as the connecting means for connecting the regular coil molded body 16A to form the long continuous coil molded body 16. For example, a method of connecting the front end and the rear end of the wire rod of the coil molded body 16A by rivets or welding can be considered.

  Thus, for example, if the long coil molded body 16 is formed by connecting the fixed coil molded bodies 16 </ b> A using the connector 52, the fixed coil molded body is converted into a standard coil. Since it can be used also when using a long coil molded object like this invention, when using a molded object, suppression of the cost of a coil molded object can be anticipated.

  For example, the lining pipe 18 is not limited to a reduced diameter pipe that is partially pressed in the circumferential direction by the diameter reduction processing or folded and flattened as shown in FIG. A reduced diameter tube obtained by reducing the diameter of the tube as it is may be used.

  Furthermore, the lining pipe 18 does not necessarily have to be a restoration of the reduced diameter pipe. For example, various lining pipes such as a lining pipe in which a long belt-like member is spirally wound and a lining pipe in which a plate-like member is attached in the circumferential direction or the longitudinal direction can be applied. It is also possible to apply other lining pipes.

  Note that the specific numerical values such as the diameter, width, and height described above are merely examples, and can be changed as appropriate.

DESCRIPTION OF SYMBOLS 10 ... Rehabilitation pipe 12 ... Existing pipe 14 ... Manhole 16 ... Coil molded body 16a ... Wire rod 16A ... Standard coil molded body 18 ... Lining pipe 20 ... Retracting machine 30 ... Rotating body 32 ... Holding part 40 ... Current plate 44 ... Roller 46, 50 ... pair of pinching rollers

Claims (9)

It is a lining method in which an existing pipe is laid as a reinforcing material in an existing pipe whose entrance is connected to a manhole, and a lining material is laid on the inside of the coil molded body,
A long coil forming having an outer diameter that is larger than or equal to the inner diameter of the existing pipe, and has a rigidity that provides an external pressure strength against the buried earth pressure required as a rehabilitation pipe line in combination with the strength of the lining material. A preparation step of preparing a body, and a drawing step of drawing the manhole from the ground through the manhole through the manhole while rotating the tip of the elongated coil molded body in the winding direction of the coil molded body. ,
The lining method, wherein the drawing step includes a regulation step for regulating a drawing amount of the coil molded body from the inlet to the manhole accompanying rotation of the tip, which is performed in the manhole.   The lining method according to claim 1, wherein the regulating step includes a step of allowing the coil molded body to pass through a wire passing portion of a rectifying plate provided in the manhole.   The lining method according to claim 1, wherein in the preparing step, the long coil molded body is formed by connecting fixed coil molded bodies. Further comprising the step of providing a retractor having moving means in the tube axis direction and rotating means for rotating the coil molded body around the tube axis;
The lining method according to any one of claims 1 to 3, wherein in the drawing-in step, the rotating means is drawn while holding and rotating a tip of the coil molded body. It is a lining method in which an existing pipe is laid as a reinforcing material in an existing pipe whose entrance is connected to a manhole, and a lining material is laid on the inside of the coil molded body,
A long coil forming having an outer diameter that is larger than or equal to the inner diameter of the existing pipe, and has a rigidity that provides an external pressure strength against the buried earth pressure required as a rehabilitation pipe line in combination with the strength of the lining material. Preparation steps to prepare the body, preparation steps,
A first drawing step of drawing the long coil molded body into the manhole from the ground while rotating the coil molded body in the winding direction, and rotating the tip of the coil molded body drawn into the manhole in the winding direction of the coil molded body A second retracting step of retracting from the inlet into the existing pipe,
The lining method, wherein the second drawing-in step includes a regulating step for regulating a drawing-in amount of the coil molded body from the inlet to the existing pipe accompanying the rotation of the tip, which is performed in the manhole.   The lining method according to claim 5, wherein the regulating step includes a step of allowing the coil molded body to pass through a wire passing portion of a current plate provided in the manhole. A lining system in which a coil molded body is laid as a reinforcing material in an existing pipe whose entrance is connected to a manhole, and a lining material is laid on the inside of the coil molded body to regenerate the existing pipe,
The coil molded body has an outer diameter that is larger than or equal to the inner diameter of the existing pipe, and has a rigidity capable of obtaining an external pressure resistance against the buried earth pressure necessary as a rehabilitation pipe line in combination with the strength of the lining material. Retracting means that is a long coil formed body, and that draws the manhole from the ground into the existing pipe while rotating the tip of the long coil formed body in the winding direction of the coil formed body A lining system comprising a regulating means provided in the manhole and regulating a drawing amount of the coil molded body from the manhole to the existing pipe as the tip rotates. The lining system according to claim 7 , wherein the regulating means includes a current plate provided in the manhole and having a wire passing portion through which the coil molded body passes. A retractor for use in the lining system according to claim 7 or 8 ,
A moving means in the tube axis direction, and a rotating means for rotating the coil molded body around the tube axis,
A retraction machine that pulls the coil molded body into the existing pipe while rotating and fixing the tip of the coil molded body to the rotating means.

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