JP4527872B2 - Pipe inner surface lining member and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lining member used for lining in sewers, waterworks, gas pipes, agricultural water pipes, and the like, and a method for producing the same, and is particularly useful for rehabilitation of these aged pipes. .
[0002]
[Prior art]
In pipes such as sewers, waterworks, gas pipes or agricultural water pipes, the pipes may be lined in order to rehabilitate old pipes due to cracks or corrosion, and there are joints on both edges. It is known that a long band-shaped member is continuously fed and wound in a spiral shape, and the inside of the tube lining is lined with a helically joined tubular body formed by joining the joining parts that are in contact with each other by fitting. (For example, “SPR Method Technical Data” published by the Japan SPR Method Association).
In the above helically bonded tubular body, since the helical bonding is carried out by a pipe making machine at the site, the machine prevents the spiral bonded portion from being detached with respect to the load acting during or after the lining construction work. It is safe to apply general protection or reinforcement.
[0003]
Normally, a curved pipe portion exists in the pipe rod, and in the above lining construction, when the pipe-formed helically joined tubular body is bent when passing through this curved pipe portion, and the curvature of the curved pipe portion is small There is a possibility that a large bending moment acts on the above-mentioned joint and the joint is detached.
Therefore, the applicant of the present invention is a strip-shaped body that is inserted into an existing pipe to be lined as a spiral pipe by being spirally wound, as shown in FIG. A strip-like substrate 10 ′ having a joint portion in which adjacent strips are fitted when wound in a spiral shape, and the substrate so as to protrude to the outer surface side when spirally wound Has already been proposed (for example, Japanese Patent Application Laid-Open No. 11-34165), which is provided with an expansion / contraction portion 105 ′ formed so that the substrate can be expanded and contracted in the width direction. .
FIG. 7 (b) shows the joining structure of the helically joined tubular body of the lining member. Since the stretchable part 105 ′ is adjacent to the joined part J ′, the stretchable part 105 ′ when passing the curved pipe part. As a result of the expansion and contraction of the sheet and the generation of the bending reaction force being suppressed, it is possible to prevent the joint from being detached due to the bending reaction force.
[0004]
[Problems to be solved by the invention]
However, in the above-described lining member with a stretchable part, the thickness of the stretchable part is the same as the thickness of the other part of the substrate part, and the bending reaction force is considerably large when the curvature of the curved pipe part is considerably small. Therefore, there is a concern about the detachment of the joint due to the bending reaction force.
Therefore, it has been proposed to make the stretchable part thinner than other parts of the substrate part.
However, in the stretchable part, the vertical rising part has a high height h, and the cross-sectional secondary moment I (I∝bh ³ ) with respect to the vertical load is large (b is the width). Since it acts as an effective reinforcement, it is expected to have an effect of reinforcing the joint against earth pressure load, etc., as described above, the stretchable part is required to increase the stretchability of the stretchable part of the lining member with the stretchable part. When the whole is thinned, the reinforcing effect against vertical load such as earth pressure is reduced, so that it is difficult to effectively improve the overall protection or reinforcement of the joint.
[0005]
An object of the present invention is to provide a joining portion for joining adjacent strips when spirally wound to a strip formed in a spiral tube by being spirally wound, and a spiral In the pipe lining inner lining member which is provided with an expansion / contraction portion which is bent so as to protrude to the outer surface side when wound on the inner surface, and is capable of expanding / contracting in the width direction, with respect to a vertical load such as earth pressure An object of the present invention is to improve the elasticity of the expansion / contraction portion while sufficiently retaining the rigidity of the expansion / contraction portion so that the joint portion of the spiral tube can be protected or reinforced as a whole.
[0006]
[Means for Solving the Problems]
In the tubular lining inner lining member according to the present invention, adjacent strips are joined to a strip formed in a spirally joined tubular body by being spirally wound when wound spirally. that the joining portion, the lining member which is bent and becomes by comprising a stretchable part having a telescopic belt-shaped member in the width direction so as to protrude to the outer surface side when wound helically, stretchable portion Is a structure characterized in that a thin-walled portion is provided adjacent to the joining portion and whose base on both sides of the stretchable portion is thinner than the rising portions on both sides .
[0007]
The method for manufacturing a pipe wall inner surface lining member according to the present invention is a method of manufacturing the above-described tube wall inner surface lining member by extrusion molding, and after extruding it with an extrusion mold so that the stretchable portion has a uniform thickness. The thin-walled portion is formed in the expansion / contraction portion with a sizing die having the same cross-sectional area as the cross-sectional area of the extrusion die outlet.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an example of a lining member according to the present invention.
In FIG. 1, 101 and 101 are ribs formed in the longitudinal direction on the surface of the strip 10, 102 is a protrusion as a male joining portion formed in the longitudinal direction on one edge of the strip, and 103 is a strip. It is a groove-type recess as a female-type joining portion formed in the longitudinal direction on the other edge end side, and has a rib 104 at the top. The interval between the ridges 102 and the ribs 101, the interval between the ribs 101 and 101, and the interval between the ribs 101 and the recesses 103 are substantially equal.
Reference numeral 105 denotes an expansion / contraction portion formed by bending the band-like body 10 between the groove-shaped recess 103 and the rib 101 so as to be expandable / contractible in the width direction toward the outside of the surface. The bent side rising portions 105c and 105c are thinner than the bent side rising portions 105c and 105c, and the thicknesses of the bent side rising portions 105c and 150c are equal to or slightly thicker than the thickness of the portion other than the bent portion 105 of the belt-like body 10.
Reference numeral 106 denotes the other edge of the belt-like body, which is bent obliquely upward. 107 is a strip packing adhered to the surface of the strip between the male projection 102 and the rib 101.
[0009]
As shown in FIG. 2, when the lining member is wound spirally, the adjacent members are joined together by fitting the male and female joint portions 102 and 103, and the other edge end portion obliquely upward. 106 is locked to the corner of the rib 101 adjacent to the male ridge 102 to hold the helically bonded tubular body, and the compression of the packing 107 makes the tube wall of the helically bonded tubular body watertight.
In the helically bonded tubular body retained in this way, when bending acts on the joint portion J, it is easily bent and deformed by an appropriate bending stress concentration action of the thin portions 105a and 105b of the bending expansion / contraction portion 105. The bending reaction force can be reduced, and detachment due to bending of the male / female fitting joint J can be well prevented.
In addition, with respect to a vertical load such as earth pressure acting on the joint portion J, both side rising portions 105c and 105c of the bending expansion / contraction portion 105 adjacent to the joint portion J exhibit high buckling rigidity because of the thick wall. Also, the detachment of the male / female fitting type joint J can be well prevented against earth pressure and the like.
[0010]
On the other hand, if the entire bending expansion / contraction part is made thin, even if the bending reaction force can be reduced, the bending rigidity against the vertical load must be reduced. Even if the buckling rigidity can be increased, the bending reaction force must be increased.
Therefore, in the lining member according to the present invention, it is possible to achieve a harmonized reduction of the bending reaction force and an increase in the buckling rigidity against the vertical load. Good protection from earth pressure after lining construction.
[0011]
In the lining member according to the present invention, if the thin portion of the bending expansion / contraction portion is made too thin, there is concern about cutting due to excessive stress concentration, and the thickness of the thin portion may be 1/2 or more of the thickness of the thick portion. preferable.
The lining member according to the present invention is molded by extrusion, and the steep wall thickness variation causes the resin flow resistance to become non-uniform, resulting in molding failure. It is preferable to change it gently.
The lining member according to the present invention can be produced by passing a softened resin body extruded from an extrusion mold through a sizing mold and cooling to a final cross-sectional shape.
[0012]
In the method for manufacturing a lining member according to the present invention, after extruding with an extrusion mold so that the expansion / contraction part has a uniform thickness, the expansion / contraction part is thin with a sizing mold having the same cross-sectional area as that of the exit of the extrusion mold. In the sizing mold, it only changes the cross-sectional shape without deforming the resin extrusion in the longitudinal direction, so it can be smoothly passed through the sizing mold without stagnation of the squeezed resin. A lining member having a good appearance can be produced.
In addition, it is possible to use an extrusion die that is used for manufacturing a conventional lining member with a uniform thickness of the bending expansion / contraction part as it is, and it is only necessary to change the sizing die, which is advantageous in terms of equipment cost. is there.
[0013]
FIG. 3 is a cross-sectional view showing an example of a lining member that can be suitably manufactured by the method for manufacturing a lining member according to the present invention. The top center portion, both top side portions, and both root portions of the bending stretchable portion 105 are narrowed down. The thickness of the other part of the bending expansion / contraction part is thickened by the thinning, and the other structure is substantially the same as the embodiment shown in the figure, and the thickness of the thin part is also thick. It is preferable to set it to 1/2 or more of the thickness of a part.
In the embodiment shown in FIG. 3 as well, the bending reaction force can be reduced due to appropriate bending concentration at the thin-walled portion of the bending expansion / contraction part 105, and the buckling rigidity with respect to the vertical load can be increased due to the thick rising parts 105c and 105c. As in the embodiment shown in FIG. 1, the bending reaction force can be reduced and the buckling rigidity can be increased with respect to the vertical load in the same manner as in the embodiment shown in FIG. It can protect well from earth pressure after bending and lining construction.
[0014]
In the lining member according to the present invention, it is possible to make the bent stretchable part made of a soft resin, for example, the bent stretchable part made of a soft vinyl chloride resin and the other part made of a hard vinyl chloride resin. However, the complexity of the mold, the use of two extruder bodies, interfacial delamination between different types of resin, especially in the case of soft vinyl chloride resin, the whole is molded with a single resin, taking into account the plasticizer bloom, etc. It is reasonable.
As this resin, for example, hard vinyl chloride resin, polyethylene, polypropylene, polycarbonate, polyester, fiber reinforced resin using these resins as madricks, and the like can be used.
[0015]
In order to perform lining construction on the inner surface of a pipe rod using the lining member according to the present invention, for example, a lining construction apparatus shown in (a) (side view) and (b) (front view) of FIG. 4 can be used.
In FIG. 4, reference numeral 1 denotes a circular ring-shaped frame, which is composed of a front frame 11 and a rear frame 12. Reference numeral 2 denotes a joining mechanism, which has an outer surface roller 21 and an inner surface roller 22 each having a groove for receiving a rib on the outer surface of the lining member and a groove for receiving a joint portion of the lining member. It is the structure (24 is a rotatable joint) connected with the hydraulic motor 25 via the gabox 23, and in the illustrated one, two sets are provided on one frame piece with an angle of 120 °.
Reference numeral 3 denotes a guide roller for the helically bonded tubular body, and a pair of outer guide roller 31 and inner guide roller 32 is rotatably supported between the front and rear frames 11 and 12. Three pairs are provided on the downstream side of each joining mechanism section 2 (based on the feeding direction of the lining member).
A groove can also be provided in at least a part of the external guide rollers 31,. Further, at least a part of the guide rollers 3 can be constituted only by the external guide roller 31 or the internal guide roller 32.
4 is a support roller for supporting the pipe making machine B in the pipe rod A, a roller shaft support plate 41 is attached to the front frame 11, and the support roller 40 is cantilevered on the roller shaft support plate 41; A compression spring 42 is attached to the end of the roller shaft that protrudes from the roller shaft support plate 41, and the compression spring pressure is adjusted by adjusting the screwing of the screw-type spring retainer 43. By adjusting the contact frictional force, a predetermined braking force is applied to the rotation of the pipe making machine B. The support rollers 4 are attached to the frame 1 at equal intervals in the circumferential direction (in the illustrated embodiment, two support rollers are provided for a frame angle of 120 °), and the roller shaft support plate 41 is rotated to the front frame 11. A pin is supported as much as possible, and a cushion spring 44 is interposed between the front frame 11 and the roller shaft support plate 41 so as to cope with a step on the inner surface of the pipe rod.
The braking force adjusting means including the compression spring 42 and the screw-type spring retainer 43 may be attached to at least one support roller.
[0016]
In order to line the inside of the pipe with the lining member according to the present invention using the above lining construction apparatus, the pipe making machine B is placed in the pipe A as shown in FIG. p drives the outer surface roller 21 and the inner surface roller 22 of the joining mechanism portion 2 of the pipe making machine B through the hydraulic hose p ′, and the lining member D supplied from the drum on the starting side manhole is joined to the joining mechanism portion 2. The outer surface roller 21 and the inner surface roller 22 are spirally fed to the female groove-shaped groove at the edge of the helically bonded tubular body of the lining member already formed by the outer surface roller and the inner surface roller of the first bonding mechanism. The pipe making machine B is rotated and advanced by the spiral feed force of the lining member by fitting and joining to the male convex strip at one edge of the lining member sent to the first joining mechanism portion, and the pipe making machine Spiral made with B The joined tubular body E is lined on the inner surface of the tube rod as the pipe making machine B rotates forward.
Even if there is a curved pipe part in the middle of this lining, and the joint part of the helically bonded tubular body is bent when passing through the curved pipe part, the joint part is reduced by the bending reaction force reducing action of the bending expansion / contraction part of the lining member. It can be held stably without detachment.
[0017]
In the lining described above, the spiral feed force by the outer roller 21 and the inner roller 22 of the joining mechanism portion 2 is w, the feed angle (angle formed with the circumferential line of the tubular body) is θ, and the spiral joined tubular body in the pipe making machine is If the radius is r, the driving torque m of the pipe making machine B by the hydraulic motor 25 is
[Expression 1]
m = rwcosθ (1)
Given in.
Assuming that the rotational braking force based on the compression force adjustment of the compression spring 42 by the support roller 4 is m ′, the condition for rotating the pipe making machine B is as follows:
m> m ′ (2)
Is established.
[0018]
In FIG. 5, the helically bonded tubular body E lined on the inner surface of the pipe rod A is fixed with respect to the rotational driving torque of the pipe making machine (if the lined lining member helically bonded tubular body becomes long, In the initial stage where the lining member spirally joined tubular body is short, the lining member spirally joined tubular body may be secured with a jig), and the lining member spirally joined tubular body has a formula (3 ) Pipe axial compression force F
[Equation 3]
F = wsinθ (3)
Works.
When this axial compressive force increases, the bending expansion / contraction portion of the lining member may be crushed. Therefore, depending on the lining construction conditions, as shown in FIG. The side edge portion 10a is extended, and the edge end 10a is brought into contact with the inner side surface 105b 'of the base 105b of the bending expansion / contraction portion 105 to prevent the bending expansion / contraction portion 105 from being crushed by the compressive force F in the tube axis direction. The inner side surface 105b ′ is preferably a stepped surface.
[0019]
In FIG. 5, the rotational braking force m ′ acts on the tubular body portion e between the pipe making machine B and the lined spirally joined tubular body E, and is generated at the joining interface of the lining member of the tubular body portion e. The shearing force τ to be applied is given by assuming that the radius of the tapered tubular body portion e is r ′ and the winding angle is β.
[Expression 4]
τ ≒ m'cosβ / r '(4)
Given in.
Thus, if the helical bonding of the lining member is carried out in a loosely fitted state, the shearing force f that can cause the bonding interface to slide relative to each other can be made extremely small, and thus Formula (5)
[Equation 5]
τ> f (5)
Is established, the helically bonded tubular body e immediately after the pipe making machine can be lined while being deformed in a direction to release the mutual sliding of the helically bonded interface of the lining member, and the helically bonded tubular body that allows the slip to escape. Since the deformation of e is nothing but the diameter expansion deformation, the spirally joined tubular body can be made to contact well with the inner surface of the tube rod while being expanded from the pipe making machine B that is rotating forward. Therefore, a sufficient flow path cross-sectional area can be ensured.
In this case, the joint part of the helically joined tubular body is loosely fitted and the joining force is weakened. However, if the lining member according to the present invention is used, the bending reaction force at the joint part is reduced and the buckling rigidity against the vertical load is reduced. It can be achieved in harmony with the increase, and even if the strength of the joint is somewhat lowered, the joint can be well protected from bending during lining construction and earth pressure after lining construction, and it is well prevented from detaching the joint it can.
[0020]
【The invention's effect】
In the pipe lining inner lining member according to the present invention, the bending portion received when passing the curved pipe portion in the lining and the earth pressure after the lining construction, etc. Both can be well protected from vertical loads, and harmonious protection can be achieved by eliminating the biased protection of only one.
[0021]
In addition, according to the method for manufacturing a pipe wall inner surface lining member according to the present invention, only the sizing mold can be changed and the extrusion mold can be used as it is. It can be manufactured economically at low equipment costs.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing an embodiment of a member for inner surface lining of a tube according to the present invention.
FIG. 2 is a drawing showing a helically bonded tubular body of the lining member shown in FIG.
FIG. 3 is a drawing showing another embodiment of the tube lining inner lining member of the present invention different from the above.
FIG. 4 is a drawing showing an example of a lining construction apparatus used for lining construction of a lining member according to the present invention.
FIG. 5 is a drawing used for explaining the lining construction of the lining member according to the present invention.
FIG. 6 is a drawing showing another embodiment of the tubular lining inner lining member of the present invention different from the above.
FIG. 7 is a view showing a conventional tube lining inner lining member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Strip | belt-shaped body 102 Male joint part 103 Female joint part 105 Bending-extension part 105a Thin part 105b Thin part 105c Thick part

Claims (2)

A belt-like body formed into a spiral-joined tubular body by being wound in a spiral shape, and a joining portion in which adjacent belt-like bodies are joined together when spirally wound are wound in a spiral shape. In the lining member comprising a stretchable portion that is bent so as to protrude toward the outer surface when the belt is stretched , the stretchable portion is adjacent to the joining portion . A tubular lining inner lining member characterized in that a thin-walled portion is provided in which the roots on both sides are thinner than the rising parts on both sides . A band-shaped body formed into a spiral-bonded tubular body by being wound in a spiral shape, and a bonding portion where adjacent band-shaped bodies are bonded together when spirally wound are wound in a spiral shape. The tube lining inner lining member, which is bent so that it protrudes to the outer surface side and can be expanded and contracted in the width direction, is formed by extruding This is a method of manufacturing, and after extruding with an extrusion mold so that the stretchable part has a uniform thickness, forming a thin part in the stretchable part with a sizing mold having the same cross-sectional area as the exit area of the extrusion mold A manufacturing method of a member for lining an inner surface of a pipe tube.

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