JP2017179968A - Resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin pipe that resists shrinking due to residual stress.SOLUTION: A hard vinyl chloride resin pipe has residual stress σ of σ≤0 as calculated by the following formula (1): σ=[E/(1-R)] t/2 (1/r1-1/r0) (E: tensile elasticity, R: Poisson ratio, t: wall thickness, r0: inside radius before slit formation, and r1: inside radius after slit formation).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resin pipe.

  For example, a gutter is provided in a highway tunnel. Such gutters are made of reinforced concrete and are aging due to long-term operation of the expressway, so it is considered that repairs will be required in the future.

  When repairing a gutter in a highway tunnel, it may be possible to remove the existing gutter and install a new one.

  In addition, although it is not a thing about repair of the side groove in the tunnel of a highway, as a drainage channel apparatus embed | buried under floors, such as a kitchen, the thing like patent document 1 is known, for example.

  In this drainage channel device, a pipe-like drainage groove is embedded in the floor of the kitchen, and a slit-like opening extending in the tube axis direction is formed at the top of the drainage groove, from the slit-like opening to the kitchen floor. It is assumed that a narrow groove opening extending in the direction is integrally provided. A drainage lid is detachably attached to the top of the groove.

JP-A-9-217402

  However, when repairing a gutter in a tunnel on a highway, to remove the existing gutter and install a new one, it is necessary to block the traffic and perform large-scale construction, which will have a significant impact on the traffic. There is a problem that enormous costs and time are required.

  Further, since the drainage device of Patent Document 1 is newly installed on the floor of the kitchen, it is difficult to adopt this structure as it is when repairing the side groove in the tunnel of the highway.

  That is, generally, the extruded resin tube has residual stress due to the difference in cooling rate between the inside and outside of the resin tube. If a slit is formed on a part of such a resin tube, the residual stress is generated. Since it is released, it is known that a contraction phenomenon occurs in a normal case.

  Therefore, when an extruded resin pipe is used as the pipe-shaped drainage groove, the residual stress that shrinks is large, so that the resin pipe is reduced in diameter. The slit (slit-like opening) may be closed.

  Thus, when the diameter of the resin pipe is reduced, for example, between the existing side groove and the resin pipe provided with the slit-like opening, or between the existing side groove and the resin pipe provided with the slit-like opening. A gap is generated between the mortar filled for repair and a defect occurs.

  Therefore, a resin tube that does not shrink due to residual stress is desired.

  Accordingly, the main object of the present invention is to solve the above-described problems.

In order to solve the above problems, the present invention provides:
It is characterized by a resin tube calculated from the following formula (1) and having a residual stress σ of σ ≦ 0.
σ = [E / (1-R ² )] · t / 2 · (1 / r1-1 / r0) (1)
(E: tensile modulus, R: Poisson's ratio, t: wall thickness, r0: inner radius before slit formation, r1: inner radius after slit formation)

  According to the present invention, a resin tube that does not shrink due to residual stress can be obtained with the above configuration.

(A) is sectional drawing of the resin pipe | tube before slit formation, (b) is sectional drawing of the resin pipe | tube after slit formation. It is sectional drawing which shows the side groove provided in the tunnel of a highway. It is a perspective view which shows an insertion process. It is a perspective view which shows a filling process. It is a perspective view which shows an opening process. It is a perspective view which shows the rehabilitation member installation process. It is a perspective view of a side groove renovation member. It is an end view of the gutter renovation member of FIG. It is a top view of the side groove renovation member of FIG.

  Hereinafter, this embodiment will be described.

First, the resin pipe 100 will be described.
The resin tube 100 is a resin tube member having no residual stress or a resin tube member having a residual stress that expands in diameter.
The resin pipe 100 may be anything as long as it is a pipe member using a resin such as polyethylene, polypropylene, polybutene, etc. in addition to the hard vinyl chloride resin. However, in places where incombustibility is required, it is most preferable to use a hard vinyl chloride resin pipe (so-called vinyl chloride pipe) using a hard vinyl chloride resin.

<Measurement method of residual stress>
Based on the following equation, the residual stress σ is calculated.
σ = [E / (1-R ² )] · t / 2 · (1 / r1-1 / r0) (1)
However, E: Tensile modulus R: Poisson's ratio t: Wall thickness r0: Inner radius before slit 110 formation r1: Inner radius after slit 110 formation Normally, if the resin pipe 100 is a PVC pipe, the tensile modulus (E ): 2400-3300, Poisson's ratio (R): 0.37-0.38.

<Measuring method of radius r0, r1>
A resin tube 100 as shown in FIG. 1A is used as a sample. FIG. 1B shows the resin tube 100 (slit tube 120) after the slit 110 has been cut.
The length of the resin tube 100 in the tube axis direction may be any number of centimeters, but is 20 cm for ease of measurement.
・ Before formation of slit 110
When the printing part 130 of the resin tube 100 is directly above, the diameter (inner diameter) perpendicular to the line 140 connecting the printing part 130 and the tube axis is measured, and the inner radius of the half is defined as r0. And the marking 150 is attached | subjected to the cross section of a diameter part. The printing unit 130 is printed with a diameter, product number, trademark (for example, “Eslon pipe”), and the like.
・ After formation of slit 110 (left for 1 minute)
Let r1 be half of the inner diameter connecting the places where the marking 150 has been made.

<About residual stress σ>
When there is a residual stress that is reduced in diameter, r0> r1, and therefore, σ> 0 from Equation (1).
On the other hand, when there is a residual stress that expands, r0 <r1, and therefore, σ <0 from Equation (1).
When r0 = r1, σ = 0.
When the slit pipe 120 is used for rehabilitation of an existing pipe line, σ ≦ 0 is preferable, and σ <0 is more preferable.
As a result, the slit pipe 120 is reduced in diameter and the gap between the existing pipe line is increased and the amount of necessary filler (mortar) does not increase.
Further, the slit tube 120 is not reduced in diameter and the slit 110 is not closed.
Furthermore, by setting σ <0, the slit tube 120 has a residual stress that expands the diameter. Therefore, there is no possibility that the slit 110 is closed due to the weight of the filler around the slit tube 120.

<Restraining method of residual stress>
When the resin tube 100 is extrusion molded, the residual strain can be controlled by optimizing the extrusion rate and the cooling rate. To control the residual strain, the extruded resin tube 100 is heated (annealed). It is most preferable in manufacturing.
The heating temperature is preferably 80 to 110 ° C., and the heating time is preferably 130 seconds or more.
As a heating method, means such as immersing the manufactured resin pipe 100 in a heated water tank (hot water tank) or heating with a heater from the outer periphery of the resin pipe 100 can be used. In particular, since the residual stress has a difference between the inner peripheral surface and the outer peripheral surface of the resin tube 100, the residual stress difference between the inner and outer peripheral surfaces of the resin tube 100 is eliminated by heating from the outer peripheral side of the resin tube 100. It is preferable.

<Preparation of vinyl chloride resin composition>
100 parts by weight of a vinyl chloride homopolymer (trade name “TS-1000R”, manufactured by Tokuyama Sekisui Kogyo Co., Ltd.), 1 part of an organic tin stabilizer (trade name “ONZ-142F”, manufactured by Sansha Co., Ltd.), polyethylene Wax-based lubricant (trade name “Hiwax220MP”, manufactured by Mitsui Petrochemical Co., Ltd.) 0.5 part, stearic acid (trade name “S-30”, manufactured by Kao Corporation) 0.5 part, calcium carbonate (trade name “Whiteon” 305S ", manufactured by Shiraishi Calcium Co., Ltd. 5 parts, black pigment (organic) (trade name" Black A-1103 ", manufactured by Dainichi Seika Co., Ltd.) 0.5 part by weight, and titanium oxide (trade name" R3L ", cocoon 2 parts by weight of Chemical) were stirred and mixed with a super mixer (100 L, manufactured by Kawata) to obtain a vinyl chloride resin composition.

<Molding of vinyl chloride resin pipe>
The vinyl chloride resin composition obtained as described above was extruded so as to have an outer diameter of about 267 mm, a thickness of 8.5 mm, and a length of 1 m to obtain a vinyl chloride resin tube as the resin tube 100.

<Examples 1-3, Comparative Example 1>
The hard vinyl chloride resin tube (resin tube 100) obtained as described above was cut as a sample for a length of 20 cm in the tube axis direction, and heated (annealed) from the periphery of this sample under the temperature conditions shown in Table 1.
In addition, as a heating method, a sample is stored in a cylindrical heating cylinder having a length of 20 cm and an inner diameter of 300 mm that has a heating wire wound in a coil shape, and the outer surface of the sample does not contact the inner surface of the heating cylinder. While doing so, the sample was heated by controlling the heating cylinder so as to satisfy the temperature conditions described in Table 1.
-Tensile elastic modulus E and Poisson's ratio R The tensile elastic modulus E and Poisson's ratio R were measured according to JIS K7161.
-Thickness of resin tube 100 The cross section of the above-mentioned sample was equally divided into eight places, and the thickness was measured, and the average value was used.
・ Residual stress σ
After the annealed sample was cooled to room temperature, the tensile modulus E, Poisson's ratio R, tube thickness, and r0 were measured.
Subsequently, a slit 110 (length 20 cm, width 5 cm) extending from one end to the other end along a direction parallel to the tube axis direction was formed in the sample and allowed to stand for 1 minute, and then r1 was measured.
This operation was performed in the same manner for the samples of Examples 1 to 3 that were annealed and the sample of Comparative Example 1 that was not annealed, and the residual stress σ was calculated according to Equation (1).
Table 1 summarizes the above results.

  According to Table 1, it was actually confirmed that the resin pipe 100 having no residual stress or the resin pipe 100 having the residual stress expanding in diameter can be obtained by performing the annealing process.

Next, an example of a drain pipe using the resin pipe 100 will be described.
2-9 is for demonstrating the application example of this resin pipe | tube 100. FIG.

  <Configuration> The configuration will be described below.

  As shown in FIG. 2, a side groove 2 is provided in the tunnel 1 of the highway. The side groove 2 has a circular water channel portion 3 and an elongated groove-shaped inlet portion 4 provided along the top of the circular water channel portion 3.

And when the gutter 2 becomes obsolete due to long-term operation of the expressway, the repair is performed as follows.
Here, the side groove 2 is constituted by the circular water channel portion 3 and the inlet portion 4. The side groove 2 is formed by a rectangular water channel portion and a lid portion like a normal side groove provided on a general road. This is because there is a possibility that the lid attached to the top of the splatter may be scattered. Further, the cause of the aging of the side groove 2 may be, for example, corrosion / expansion of a reinforcing bar due to a sprayed snow melting agent or the like, and peeling of concrete accompanying the corrosion / expansion of the reinforcing bar.

[About the gutter rehabilitation method]
A side groove renovation method for rehabilitating the side groove 2 provided in the tunnel 1 is as follows.

(1) First, as shown in FIG. 3, an insertion step of inserting a resin rehabilitation pipe member 11 into the circular water channel portion 3 constituting the side groove 2 is performed.
Next, as shown in FIG. 4, the gap 12 between the circular water channel portion 3 and the rehabilitation pipe member 11 is filled with a backing material 13, and the circular water channel portion 3 and the rehabilitation pipe member 11 are backed up. The filling process integrated at 13 is performed.
Then, as shown in FIG. 5, an opening process is performed in which the top portion of the rehabilitation pipe member 11 is cut in the axial direction (cut portion 16) to form a slit-like opening portion 17.

  Here, the above-described resin pipe 100 (see FIG. 1) is used for the rehabilitation pipe member 11. As the rehabilitation pipe member 11, a cylindrical member having a diameter smaller than that of the circular water channel portion 3 is used so that the backing material 13 is effectively injected and filled. An index line 18 (see FIG. 3) extending in the axial direction may be formed in advance at a position that is the top of the rehabilitation pipe member 11.

  And as pre-processing of the above-mentioned insertion process, it is made to perform the sanding process which attaches particles, such as sand, to the end of pipe member 11 for rehabilitation with an adhesive (sanding process), and pipe member for rehabilitation You may make it improve the adhesiveness, joining property, etc. of 11 edge part. Then, the rehabilitation pipe member 11 is inserted from a manhole, a mass, or the like installed at the position of an emergency parking zone provided for every predetermined distance in the tunnel 1 of the highway. Further, the rehabilitation pipe members 11 are joined to each other simply using a tape in a state of being abutted (joining process).

  For the backing material 13, mortar or the like can be used. When performing the filling process, a seal portion for blocking the leakage of the backing material 13 is attached to the periphery of the end portion of the rehabilitation tube member 11 located at the end. The opening process (or cutting process) is performed after the backing material 13 is cured. The opening process is performed so as to cut two positions along both side surfaces of the inlet portion 4. At this time, the seal part attached to the end is removed.

  As described above, by using the rehabilitating pipe member 11 that has been subjected to the annealing treatment, the rehabilitating pipe member 11 has the resin pipe 100 having no residual stress as described above, or has a residual stress that expands in diameter. Since the resin pipe 100 is used, the rehabilitation pipe member 11 will not be reduced in diameter even if the slit-shaped opening 17 is formed after being embedded in the circular water channel part 3. Therefore, the gap between the rehabilitation pipe member 11 and the backing material 13 is not increased, and the slit-shaped opening 17 is not closed due to the reduced diameter.

  (2) At this time, as shown in FIG. 6, between the insertion step (FIG. 3) and the filling step (FIG. 4), the inlet portion 4 of the side groove 2 with respect to the top portion of the rehabilitation pipe member 11. It is preferable to perform a rehabilitation member installation step of installing a resin side groove renovation member 22 for rehabilitating the side surface 21 of the resin.

  Here, the side groove renovation member 22 will be described later. After the rehabilitation member installation step, the gap 12 between the circular water channel portion 3 and the rehabilitation pipe member 11 becomes substantially constant, and the rehabilitation pipe member 11 and the side groove rehabilitation member 22 are injected by the backing material 13. It is preferable that the rehabilitation pipe member 11 and the side groove renovation member 22 be pressed from above with a pressing member such as a pressing metal (pressing step). The pressing member can be fixed to a road surface in the tunnel 1 with a screw member such as a screw or a screw.

  When the side groove renovation member 22 is used, filling of the backing material 13 is performed between the side groove renovation member 22 and the side surface 21 of the inlet portion 4 of the side groove 2 (see the gap portion 33 in FIG. 7). Then, after the backing material 13 is cured, the presser member is removed, and the above-described opening process (FIG. 5) is performed together with the side groove renovation member 22.

  Of course, the above-described side groove renovation method can be applied to the case where a side groove is newly provided.

[About side groove renovation member 22]
Below, the resin side groove renovation member 22 used for rehabilitation of the side groove 2 provided in the tunnel 1 is demonstrated.

(3) As shown in FIG. 7 (FIG. 9 to FIG. 9), the side groove rehabilitation member 22 abuts at least the top of the resin rehabilitation pipe member 11 installed in the circular water channel part 3 constituting the side groove 2. A cylindrical surface-shaped bottom surface portion 31 that can be disposed;
A pair of side wall portions 32 erected from both side edge portions of the bottom surface portion 31 and renewing the side surface 21 of the inlet portion 4 of the side groove 2;
A gap portion 33 for filling the backing material 13 is secured between the side wall portion 32 and the side surface 21 of the inlet portion 4 of the side groove 2 and between the side wall portion 32 and the side surface 21 of the inlet portion 4 of the side groove 2. And a possible rib portion 34 (or protrusion).
Here, the side groove renovation member 22 is integrally formed of resin such as PVC, PP, FRP, for example. In addition, about the end surface 35 of the longitudinal direction of the side groove renovation member 22, since it is finally removed (removed) by an opening process, it does not need to provide. The bottom surface portion 31 is an upward convex curved surface having a curvature corresponding to the diameter of the rehabilitation pipe member 11. The bottom surface portion 31 is cut and removed in the opening process.

  The side wall portion 32 has a height substantially the same as or slightly lower than the side surface 21 of the inlet portion 4 of the side groove 2. The rib part 34 is made to be perpendicular to the side wall part 32 and extends integrally in the vertical direction (or the height direction of the side wall part 32). A plurality of rib portions 34 are provided on the outer surface of the side wall portion 32 with a predetermined interval along the longitudinal direction of the side groove renovation member 22.

(4) Further, the rib portion 34 has an anchor portion 41 that can be locked to the backing material 13.
Here, the anchor portion 41 is an integral anchor rib projecting vertically from both ends of the tip portion of the rib portion 34 or the vicinity thereof. However, the anchor part 41 is not limited to the above.

(5) The bottom surface 31 has a fastening hole 51 that can be fastened and fixed to the top of the rehabilitation pipe member 11.
Moreover, the said bottom face part 31 shall have the window part 52 which can visually recognize the index line 18 provided in the top part of the pipe member 11 for rehabilitation.
Here, the fastening hole portion 51 and the window portion 52 are provided at the position of the width center portion of the bottom surface portion 31.

The fastening holes 51 are provided at three locations, that is, the central portion in the longitudinal direction of the bottom surface portion 31 and the vicinity of both end portions. However, the installation position and the number of fastening holes 51 are not limited to the above. A screw member such as a screw or a screw is used for fastening between the bottom surface portion 31 using the fastening hole portion 51 and the top portion of the rehabilitation pipe member 11.
The window 52 is provided at a position between the fastening holes 51 so as to extend in the longitudinal direction of the index line 18.

  <Operational Effect> According to this application example, the following operational effect can be obtained.

[Effect of side groove rehabilitation method]
(Effect 1) When the side groove 2 provided in the tunnel 1 is rehabilitated, first, the resin-made rehabilitation pipe member 11 is inserted into the circular water channel portion 3 constituting the side groove 2 in the insertion step. Next, in the filling process, the gap 12 between the circular water channel portion 3 and the rehabilitation pipe member 11 is filled with the backing material 13, and the circular water channel portion 3 and the rehabilitation pipe member 11 are integrated with the backing material 13. Turn into. Finally, in the opening step, the top of the rehabilitation pipe member 11 is cut in the axial direction to form the slit-shaped opening 17. By doing so, it is not necessary to cut off the traffic and carry out the construction on a large scale. Therefore, compared with the case where the existing side gutter 2 is removed and newly constructed, the construction is easier, so the traffic is affected. In addition, it is possible to repair the side groove 2 in the highway tunnel 1 in a short period of time and at a low cost.

  (Operation Effect 2) A rehabilitation member installation step is provided between the insertion step and the filling step, and a side groove renovation member 22 for rehabilitating the side surface 21 of the inlet portion 4 of the side groove 2 is installed at the top of the rehabilitation pipe member 11. I made it. This makes it possible to easily regenerate the inlet portion 4 of the side groove 2 simultaneously with the circular water channel portion 3 constituting the side groove 2. Moreover, when the slit-shaped opening 17 is formed in the top of the rehabilitation pipe member 11 in the opening process by installing the side groove rehabilitation member 22 on the top of the rehabilitation pipe member 11, a resin side groove renewal member 22 is formed. Since it becomes possible to cut and form the slit-shaped opening 17 directly from the inside (the position where there is no backing material 13), there is no need to cut the backing material 13 using a concrete cutter or the like. The slit-shaped opening 17 can be easily formed with a general and easy-to-handle tool. Therefore, workability can be improved.

[About the effect of the side groove renovation member 22]
(Effect 3) The side groove rehabilitation member 22 abuts the cylindrical bottom surface portion 31 against the top of the resin rehabilitation pipe member 11 installed in the circular water channel portion 3 constituting the side groove 2. Arranged in this way.
And the side wall part 32 standingly arranged from the both-sides edge part of the bottom face part 31 is arrange | positioned so that the side surface 21 of the entrance part 4 of the side groove 2 may be opposed.
At this time, the gap portion 33 is secured between the side wall portion 32 and the side surface 21 of the inlet portion 4 of the side groove 2 by the rib portion 34 extending from the side wall portion 32 toward the side surface 21 of the inlet portion 4 of the side groove 2.
Therefore, by filling the gap portion 33 with the backing material 13, the side wall portion 32 and the side surface 21 of the inlet portion 4 of the side groove 2 are integrated by the backing material 13, and the side wall portion 32 forms the inlet portion of the side groove 2. 4 side surfaces 21 are rehabilitated.
In addition, the bottom surface part 31 is cut out from the inner side of the side groove renovation member 22 after the backing material 13 is cured. This makes it possible to cut only the resin portion.

  (Effect 4) The anchor part 41 was provided in the rib part 34. FIG. Thereby, since the anchor part 41 is latched by the backing material 13, the rib part 34 can be firmly fixed to the backing material 13. Therefore, the side wall portion 32 can be prevented from falling off.

(Effect 5) The hole 51 for fastening was provided in the bottom face part 31. FIG. Thereby, the side groove renovation member 22 can be easily fastened and fixed to the top of the rehabilitation pipe member 11 using the fastening hole 51.
Further, a window portion 52 is provided on the bottom surface portion 31. Thereby, it becomes possible to visually recognize the index line 18 provided on the top of the rehabilitation pipe member 11 through the window 52 from the outside, and easily align the side groove rehabilitation member 22 with respect to the rehabilitation pipe member 11. be able to.

  As mentioned above, although embodiment of this invention has been explained in full detail with drawing, embodiment is only an illustration of this invention. Therefore, the present invention is not limited only to the configuration of the embodiment, and it goes without saying that design changes and the like within a scope not departing from the gist of the present invention are included in the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if not specifically described. In addition, in the case where a plurality of examples and modifications are disclosed in the embodiment as those of the present invention, possible combinations of combinations extending over these are included even if not specifically described. Of course. Further, the configuration depicted in the drawings is of course included even if not particularly described. Further, when there is a term of “etc.”, it is used in the sense that the equivalent is included. In addition, when there are terms such as “almost”, “about”, “degree”, etc., they are used in the sense that they include those in the range and accuracy recognized by common sense.

DESCRIPTION OF SYMBOLS 1 Tunnel 2 Side groove 3 Circular water channel part 4 Entrance part 11 Rehabilitation pipe member (drainage pipe line)
12 Gap 13 Backing material 16 Cut portion 17 Slit-shaped opening 18 Index line 21 Side surface 22 Side groove renovation member 31 Bottom surface portion 32 Side wall portion 33 Gap portion 34 Rib portion 35 End surface 41 Anchor portion 51 Fastening hole portion 52 Window portion 100 Resin Tube 110 slit

Claims (1)

A resin pipe, wherein the residual stress σ is calculated from the following formula (1) and σ ≦ 0.
σ = [E / (1-R ² )] · t / 2 · (1 / r1-1 / r0) (1)
(E: tensile modulus, R: Poisson's ratio, t: wall thickness, r0: inner radius before slit formation, r1: inner radius after slit formation)