JPH0725147B2 - Threaded tube manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a spiral pipe made of synthetic resin, which is mounted on, for example, an aged sewer pipe.

(Prior Art) Sewage pipes such as fume pipes may be deteriorated due to erosion by corrosive gas, earth pressure, and the like, leading to cracks, water leakage, and the like. For this reason, it has been practiced to rehabilitate sewer pipes by installing synthetic resin pipes in the aged sewer pipes.

As one of the methods for rehabilitating such a sewer pipe, a method using a pipe making machine capable of continuously producing a spiral pipe by spirally winding a synthetic resin strip has recently been adopted. The pipe-making machine spirally winds a synthetic resin strip introduced into the pipe-making machine, and a side edge portion in the width direction of the rolled strip-shaped body is newly provided in the pipe-making machine. The spiral tube is formed by joining the side edges of the introduced strip in the width direction. A method of rehabilitating a sewer pipe using such a pipe making machine is to place the pipe making machine in a manhole to which the end of the sewer pipe to be rehabilitated is connected and to wind a synthetic resin strip. The strip-shaped body drum is arranged on the ground surface, and the strip-shaped body is sequentially introduced from the strip-shaped body drum to the pipe-making machine arranged in the manhole, and the spiral pipe manufactured by the pipe-making machine is manufactured. It will be implemented by introducing it directly into the sewer pipe.

(Problems to be Solved by the Invention) The strip-shaped body introduced into the pipe-making machine is usually wound into a strip-shaped body drum over a predetermined length. When a spiral pipe having a predetermined length is installed in a sewer pipe having a predetermined length, the strip is once cut, so that the strip becomes shorter on the strip drum. In the case of producing a spiral tube by paying out a strip from such a strip drum,
It may not be possible to manufacture a spiral tube of the required length. For this reason, it is necessary to unwind a strip-shaped body from a strip-shaped body drum on which a strip-shaped body of a required length is not wound, and to manufacture a new spiral tube unless a spiral tube of a desired length is obtained. The strips of the strip drum are discarded as scraps. For this reason, it is ideal that all the strips in the strip drum be used up as spiral pipes, but since the length of the sewer pipe is not constant, the strips of strips that cannot be used in the strip drum are Occurrence is unavoidable. The length of such a scrap material can reach several hundred meters in a long case, and the economical efficiency is significantly impaired.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a method for manufacturing a spiral tube capable of manufacturing a spiral tube of a predetermined length without generating an end material of a strip. Another object of the present invention is to provide a method for manufacturing a spiral tube in which a spiral tube manufactured by connecting band-shaped members to each other is not likely to be damaged from the connecting portion.

(Means for Solving the Problems) A method for manufacturing a spiral tube according to the present invention comprises: a terminal portion of a preceding synthetic resin strip which is introduced into a pipe manufacturing machine to form a spiral tube by the pipe manufacturing machine; A step of aligning and facing a starting end portion of a subsequent synthetic resin strip to be connected to an end portion of the strip in a state in which the spiral tube is curved in a direction corresponding to the outside. And a step of heating and melting the opposite ends of the strips, and a step of abutting the melted ends together and bonding the two at a predetermined pressure to bond the strips together. And a step of continuously introducing the terminal end of the preceding strip and the starting end of the strip connected to the end into the pipe making machine to form a spiral pipe by the pipe making machine. As a result, the above purpose is achieved.

(Example) Hereinafter, the present invention will be described with reference to Examples.

FIG. 1 is an explanatory view schematically showing an example of the method for manufacturing the spiral tube of the present invention. In the figure, 10 is a sewage pipe to be rehabilitated, and the sewage pipe 10 is arranged between manholes 21 and 22 with a predetermined gradient. A pipe making machine 30 is disposed in one of the manholes 21. The pipe-making machine 30 spirally winds a synthetic resin band-shaped body, which is successively fed from a band-shaped body drum arranged on the surface of the manhole 21 near the opening 21a, and the width of the rolled band-shaped body. One side edge portion in the direction is joined to a side edge portion in the width direction adjacent to the side edge portion of the strip newly introduced into the pipe making machine 30 to form the spiral tube 40. The spiral pipe 40 formed by the pipe making machine 30 is sequentially introduced into the sewer pipe 10 from the formed tip and rotates straight in the sewer pipe 10 while rotating.

When the end portion of the strip-shaped body 41 appears when manufacturing the spiral tube in this manner, the driving of the pipe manufacturing machine 30 is once stopped. Then, the starting end of the succeeding strip-shaped body 42 wound around another strip-shaped body drum 43 is connected to the end of the strip-shaped body 41 by, for example, heat-sealing by the strip-shaped connecting device 5, and thereafter. , The connected strips are continuously introduced into the pipe making machine 30, and the strip making device 30 continuously introduces the strips into the spiral pipe 40.
And

In the pipe making machine 30, for example, a spiral pipe is manufactured by using a band-shaped body 41 (42) having a sectional structure as shown in FIG. The strip-shaped body 41 (42) is a sheet portion 41a (42a) having a smooth surface.
And the protrusions 41b (42b), which are juxtaposed in the width direction with a predetermined gap on the back surface of the seat portion 41a (42a). Then, the belt-shaped body 41 is so that the seat portion 41a is on the inner peripheral side.
(42) is wound into a spiral tube. Each ridge 41b (42
b) has a T-shaped cross section. On the rear surface of one side in the width direction of the seat portion 41a, a fitting protrusion 41c (4
2c) is arranged in parallel with each of the ridges 41b (42b).
At the tip of the protrusion 41b (42b) adjacent to the fitting protrusion 41c (42c), a locking portion 41d (42) bent toward the fitting protrusion 41c (42c) is provided.
d) is formed. The other side portion in the width direction of the seat portion 41a (42a) has an engagement step 41f capable of engaging one side portion 41e (42e) of the seat portion 41a in which the fitting projection 41c (42c) is formed.
It is stepped down to form (42f) and is located on the back side by the thickness of the seat portion 41a. A fitting concave groove 41g (42g) bent to the back side is formed in this portion so that the fitting protrusion 41c (42c) formed on one side can be fitted. A ridge 41h (42h) having a T-shaped cross section is provided at the bent portion where the fitting groove 41g (42g) is formed so as to project to the back side. At the side edge portion in the width direction of the seat 41a forming the fitting recessed groove 41g (42g), an engaging rib that extends while inclining to the back side is formed.
41i (42i) is formed. At the tip of the engaging rib 41i (42i), the band-shaped body 41 (42) is spirally wound, and the adjacent fitting protrusions 41c (42c) are fitted into the fitting concave grooves 41g (42g). In this case, the engaging projection 41c adjacent to the fitting projection 41c (42c)
It can be locked to the bent locking portion 41d (42d) of b (42b).

As shown in FIG. 3, the strip-shaped connecting device 5 includes a terminal portion of a strip-shaped body 41 made of a synthetic resin such as vinyl chloride, which is preceding,
A joining machine 50 that can fix the starting ends of the subsequent synthetic resin strips 42 in a state in which they are bent in a direction corresponding to the outside when they are formed into spiral tubes and apply a predetermined pressure to each end surface, The heating machine 80 heats and melts the ends of the strips fixed by the joining machine 50. The heating machine 80 is separate from the joining machine 50.

The joining machine 50 has a rectangular parallelepiped pedestal 51 having a width dimension slightly larger than the width-direction dimensions of the strip-shaped bodies 41 and 42 to be bonded and having a longitudinal dimension sufficiently longer than the width-direction dimension.
On one end of the pedestal 51, a flat plate-shaped starting end portion support pedestal 53 whose corners are respectively supported by the blocks 52 is arranged in a substantially horizontal state. The starting end portion support base 53 has a seat portion in which the vicinity of the starting end portion of the succeeding strip-shaped body 42 connected to the end portion of the preceding strip-like body 41 becomes an inner peripheral side portion when formed into a spiral tube.
42a is placed so that it faces downward.

The starting end portion support base 53 is provided with a belt-shaped member position adjusting mechanism for adjusting the starting end portion of the belt-shaped member 42 placed on the starting end portion support base 53 to a predetermined position. As shown in FIG. 4, the band position adjusting mechanism has an adjusting block 91 that fits into an opening 53d provided in the starting end support base 53. The opening 53d provided in the starting end support base 53 is
It is provided so as to correspond to the portion where the fitting concave groove 42g of the subsequent strip-shaped body 42 placed on 3 is located. The adjustment block 91 fitted in the opening 53d is configured such that the inside of the opening 53d is covered by the starting end support 5
The strip-shaped body 42 placed on the 3 can be moved in the width direction. The adjustment block 91 protrudes upward from an opening 53d provided in the starting end support base 53 so that the upper portion thereof can be fitted into an engagement step 42f provided on one side of the strip 42. . The adjusting block 91 is formed with an inclined surface 91b that supports an engaging rib 42i provided at one side edge of the band-shaped body 42, and can be further fitted into the fitting groove 42g of the band-shaped body 42. Projection 9
1c is projected.

The adjustment block 91 is fixed on the guide block 92. At the center of the guide block 92, a starting end support base is provided.
A through hole penetrates so as to be parallel to the width direction of the strip-shaped body placed on 53, and a screw groove is formed on the inner peripheral surface of the through hole. A screw rod 93 is rotatably installed below the starting end portion support base 53 so as to pass through the through hole of the guide block 92, and the screw groove on the outer peripheral surface of the screw rod 93 is formed in the through hole of the guide block 92. It is screwed into the thread groove on the inner peripheral surface.

As shown in FIG. 5, the screw rod in the guide block 92 is
Projections 92a and 92a protruding outward are provided on the upper portions of the respective side portions in the direction orthogonal to the axis of 93. Each of the protrusions 92 of the guide block 92 is provided on the lower surface of the starting end support base 53.
A pair of guide rails 94 and 94 which a can engage with are attached and slide on each guide rail 94 of the guide block 92.

Therefore, if the screw rod 93 is rotated forward and backward, the guide block
92 is screw-fed in the width direction of the strip-shaped body 42 placed on the starting end support base 53. Then, the adjustment block 91 mounted on the guide block 92 moves together with the block 92. The protrusion 91c of the adjustment block 91 is fitted into the fitting groove 42g of the strip 42.
By moving the adjustment block 91 in a state of being fitted inside, the starting end portion of the belt-shaped body 42 moves in the width direction with respect to the starting end portion support base 53.

As shown in FIG. 4, one end of the screw rod 93 penetrates a support block 95 attached to the lower surface of the starting end part support base 53, and the handle 96 for rotating the screw rod 93 is attached to the penetrating end. Is installed. Further, the support block 95 is provided with a lock mechanism 97 that comes into contact with the screw rod 93 in the support block 95 to prevent the screw rod 93 from rotating. The lock mechanism 97 is composed of a bolt member 97a screwed to the support block 95 and a handle member 97b for rotating the bolt member 97a. The handle member 97b is rotated to screw the tip of the bolt member 97a. When the rod 93 is brought into contact with the rod 93, the rotation of the screw rod 93 is restricted.

As shown in FIG. 3, the starting end portion support base 53 has an engaging portion at each of its corners that protrudes outward in the width direction of the base 51.
With 53b. A pair of long plate-shaped fixing plates 54 and 54 extending in the width direction of the gantry 51 are mounted on the starting end portion support base 53. Each fixing plate 54 is arranged so that each end is located on the engaging portions 53b and 53b which make a pair in the width direction of the starting end support base 53, and each end is fixed by a screw 55. It is locked to the starting end support base 53. Then, with the vicinity of the starting end portion of the succeeding strip-shaped body 42 placed on the starting end portion support base 53, each fixing plate 54 is locked to the engaging portion 53b of the starting end portion support base 53 with the screw 55, respectively. Then, the vicinity of the starting end of the belt-like body 42 is fixed by tightening.

An elongated plate-shaped starting end portion fixing base 56 extending in the width direction of the mounting base 51 is arranged in a substantially horizontal state at a position separated from the starting end portion support base 53 in the central portion direction of the mounting base 51 by a predetermined length. Each end of the starting end portion fixing base 56 is supported by a pair of blocks 57 and 57 on the pedestal 51 so that the upper surface thereof has the same height as the upper surface of the starting end portion supporting base 53.

A spacer 56a made of an elastic material such as rubber is attached to the starting end fixing base 56. The spacer 56a
Is a thin plate having a thickness of about 3 to 5 mm. As shown in FIG. 5, when the starting end of the succeeding strip 42 is placed on the spacer 56a, the starting end is located above, , It is in a warped state in the direction corresponding to the outside when the spiral tube is used.
A fixed plate 58, which has a long plate shape similar to that of the starting end portion fixing base 56, is provided on the starting end portion fixing base 56, and the strip-shaped body 41 on the spacer 56a.
It is attached to hold down the starting end. The fixing plate 58
Is the end of the starting end fixing base 56 and the screw 59
Are engaged with each other. Then, with the starting end of the succeeding strip 42 being placed on the spacer 56a on the starting end fixing base 56, the fixing plate 58 is screwed and tightened to the starting end fixing base 56. As a result, the starting end of the strip 42 is fixed by the fixing plate 58 in a state of being warped upward.

The fixed plate 58 has a guide portion 58a whose side portion on the side of the starting end portion support base 53 protrudes upward over the entire region in the longitudinal direction. The guide portion 58a runs along a cutter when the end face of the starting end portion of the strip-shaped body 42 sandwiched by the starting end portion fixing base 56 and the fixing plate 58 is cut so as to be orthogonal to the longitudinal direction of the strip-shaped body. Used to let If the cutter is moved along the guide portion 58a, the cutter will be
The end face of 42 is cut so as to be surely orthogonal to the longitudinal direction of the strip 42.

A rack 61 is arranged on the upper surface of the center of the gantry 51 in the width direction along the longitudinal direction thereof.

An end of a guide rod 62 is supported by a block 52 that supports one corner of the side of the starting end supporting base 53 on which the starting end fixing base 56 is disposed. The guide rod 62 extends in the longitudinal direction of the pedestal 51, and the guide rod 62 is attached to a block 63a arranged on one side in the width direction at the other end of the pedestal 51.
The other end of is supported. Blocks 63b are arranged side by side in the width direction of the block 63a.
A guide rod 64 is provided between the block 57 and the block 57 that supports the starting end portion fixing base 56.

On one guide rod 62, two blocks 65 and 66 are separated from each other by a predetermined length from the side where the block 63a is disposed, and are slidably fitted on the guide rods 62, respectively. Block 63
The block 66 disposed on the far side with respect to a is longer in the axial direction of the guide rod 62 than the other block 65.
Blocks 67 and 68 of the same size (see FIG. 6) are also fitted on the other guide rod 64 so as to be slidable with respect to the guide rod 64 with a predetermined distance therebetween.

A terminal end support base 69 using a thin plate having a rectangular shape in plan view is attached to each of the blocks 65 to 68 in a substantially horizontal state, and the terminal end support base 69 has a lower surface of each corner portion of each block 65 to 68. Are supported by each. A block 66 which is fitted onto the guide rod 62 and extends in the axial direction of the guide rod 62 extends from the terminal end support base 69 toward the starting end fixed base 56 side.

A sheet portion 41a, which becomes an inner peripheral side portion when the spiral tube is formed in the vicinity of the end portion of the preceding strip-shaped body 41 which is a spiral tube in the pipe making machine 30, is located below the terminal end support base 69. It is placed so that On the upper surface of the terminal end support base 69, a positioning ridge 69a is formed along the longitudinal direction of the pedestal 51, into which the above-mentioned fitting concave groove 41g formed on one surface of the mounted band-shaped body can be fitted. Has been. The belt-like body 41 placed on the terminal end support base 69.
The fitting recessed groove 41g is fitted to the positioning protrusion 69a on the upper surface of the terminal end support base 69, so that the terminal end support base 69a is
Positioned on top.

The terminal support base 69 has a base 51 at each corner.
Has an engaging portion 69b protruding outward in the width direction. A pair of long plate-shaped fixed plates 71 and 71 extending in the width direction of the gantry 51 are disposed on the terminal end support base 69, respectively. Each end of each fixing plate 71 is locked to each engaging portion 69b that forms a pair in the width direction of the gantry 51 with a screw 72. Then, with the vicinity of the end portion of the preceding strip-shaped body 41 placed on the end portion support base 69, the respective end portions of the fixing plates 71 and 71 are connected to the end portion support base.
By engaging and tightening the engaging portions 69b of the screws 69 with the screws 72, respectively, the vicinity of the end portion of the band-shaped body 41 is fixed to the end portion supporting base 69.
Fixed on top.

The starting end support base 69 is a block 6 that supports the support base 69.
5, 66 and 67, 68 move toward and away from the starting end support 56 by sliding on the guide rods 62 and 64, respectively.

A long plate-shaped terminal end fixing base 73 extending in the width direction of the pedestal 51 is arranged in a substantially horizontal state at a position separated from the terminal end supporting base 69 toward the starting end fixing base 56 by a predetermined length. . The terminal end fixing base 73 is slidably fitted on the guide rod 62, and a tip portion of a block 66 supporting one corner of the terminal end supporting base 69 extending from the terminal end supporting base 69. In addition, one end is supported by one end, and the other end is supported by a block 74 slidably fitted on the guide rod 64. The terminal fixed base
The upper surface of 73 has the same height as the upper surface of the terminal end supporting base 69 and the upper surface of the starting end fixing base 56. The terminal fixing base 73 and the terminal supporting base 69 are one block 66.
When the terminal end support base 69 moves along the guide rods 62 and 64, the terminal end fixing base 73 also follows the terminal end support base 69 and moves in the same manner.

A spacer 73a made of a material having an elastic force such as rubber is provided on the terminal end fixing base 73. The spacer 73a has a thin plate shape with a thickness of about 3 to 5 mm. As shown in FIG. 6, when the rear end of the preceding strip 41 is placed on the spacer 73a, the rear end The part is bent upward, that is, when it is formed into a spiral tube, it is bent in a direction corresponding to the outside. Then, on the terminal end fixing base 73, a fixing plate 75 having the same long plate shape as the terminal end fixing base 73 is attached so as to press the terminal end portion of the strip-shaped body 42. Each end of the fixing plate 75 is locked to each end of the terminal fixing base 73 by a screw 76. Then, the preceding strip 41 is placed on the terminal fixing base 73.
With the end portion of the strip placed, the fixing plate 75 is attached to the strip-shaped body 41.
The end portion of the strip 41 is fixedly supported by the terminal end fixing base 73 by placing the end portion of the belt-shaped body 41 on the terminal end fixing base 73 and screwing each end thereof to the terminal end fixing base 73.

The fixing plate 75 is, like the fixing plate 58 disposed above the starting end fixing base 56, a guide portion of a cutter for cutting the end surface of the band-shaped body 41 so as to be orthogonal to the longitudinal direction thereof. 75
a is projected on the side of the upper surface of the terminal support base 69.

As shown in FIG. 6, on the lower surface of the terminal support base 69,
Mounting members 69c and 69d are mounted respectively, and one mounting rod 76 is installed between the mounting members 69c and 69d. An upper part of a sliding block 77 is slidably fitted on the mounting rod 76 so as to be slidable on the mounting rod 76. The mounting rod 76 has
Mounting member 69 on the side where the sliding block 77 and the terminal end fixing base 73 are arranged
A push spring 76a is fitted so as to be located between c and c. Therefore, when the sliding block 77 is moved to the side where the terminal end fixing base 73 is arranged against the biasing force of the pressing spring 76a, the pressing spring 76c
Presses the attachment member 69c to move the terminal end support base 69 to the side where the terminal end support base 73 is disposed.

The sliding block 77 extends in the direction orthogonal to the mounting rod 76 over substantially the entire area of the terminal end support base 69, and the guide rods 62 and 64 are slidably inserted through the respective side portions thereof. There is. The central portion of the sliding block 77, which is sandwiched between the guide rods 62 and 64, faces the rack 61 disposed on the pedestal 51, and a space portion is formed in the facing portion. And, in the space, a pinion gear that meshes with the rack 61
78 is rotatably arranged. The pinion gear 78 is
It is attached to a gear shaft 78a extending in a direction orthogonal to the mounting rod 76. The gear shaft 78a is rotatably supported by the sliding block 77, and one end of the gear shaft 78a has a sliding block 77a.
77 extends outward from the 77, and the gear shaft 78a is attached to the extended end.
A handle 79 for rotating the is attached.

Therefore, the handle 79 is rotated to move the gear shaft 78a to the sixth position.
If the pinion gear 78 is rotated in the direction indicated by arrow A in the figure,
Also rotates in the same direction, and the pinion gear 78 rolls on the rack 61 in the direction in which the terminal end fixing base 73 is disposed. As a result, the sliding block 77 moves in the same direction along the mounting rod 76 and presses the pressing spring 76a. As a result, the terminal support 69
The mounting member 69c attached to is pressed by the pressing spring 76a,
The terminal fixing base 73 is moved in the arrangement direction. At this time, since the terminal end fixing base 73 is integrally connected to the terminal end supporting base 69 via the block 66, the terminal end fixing base 73 follows the terminal end supporting base 69 and moves in the same direction.

When the handle 79 is rotated in the opposite direction, the sliding block 77 also moves in the opposite direction. And sliding block 77
Is further moved in the same direction and comes into contact with the blocks 65 and 67 supporting the terminal end support base 69, the sliding block 77
The end support base 69 also moves in the same direction by the movement.

The sliding block 77 includes a gear shaft 78a in the sliding block 77.
A lock mechanism 9 that abuts on the gear shaft 78a and restricts rotation of the gear shaft 78a.
8 are provided. The lock mechanism 98 includes a sliding block 7
It has a bolt member screwed to 7 and a handle for rotating the bolt member, and the rotation of the gear shaft 78a is restricted by abutting the bolt member on the gear shaft 78a.

As shown in FIG. 3, the heating device 80 includes a control body 81 in which a heating temperature, a heating time, etc. are set and operated, and a heating portion 82 connected to the control body 81 via a cable 84. Pressing member
With 83. The heating unit 82 has a rod shape with a square cross section, and the surface of the heating unit 82 has a predetermined temperature set by the control main body 81. The pressing member 83 has a pair of flat plate members 83a arranged in parallel and a grip portion 83b that connects the flat plate members 83a and is curved in a U shape.

The rod-shaped heating unit 82 heated to a predetermined temperature is a starting end fixing base.
One end of the strip 42 fixed on 56 is arranged so as to abut the end face of the start end, and the end face of the end of the preceding strip fixed on the end fixing base 73 is fixed to the other face on the opposite side. The flat members 83a and 83a of the pressing member 83 are placed on the fixing plates 58 and 75 as shown in FIG. And melt.

The connection between the strips by the connecting device having such a configuration is performed as follows.

First, the starting end portion of the succeeding strip-shaped body 42 to be connected is placed on the spacer 56a of the starting end portion fixing base 56, and the end face thereof is the terminal end fixing base 7.
Place it so that it extends slightly to the 3 side. As a result, the starting end of the strip 42 is warped upward. At the same time, the vicinity of the starting end portion is placed on the starting end portion support base 53. In this case, the fitting groove 42g in the band 42
The ridge 91c of the adjustment block 91 of the band-shaped body position adjusting mechanism that projects from the upper surface of the starting end portion support base 53 is fitted to.

Next, the fixing plate 58 is placed on the strip-shaped body 42, and each end of the fixing plate 58 is locked to the starting end fixing base 56 with the screw 59, and the screw 59 is tightened. Further, the fixing plates 54 and 54 are placed on the strip-shaped body 42, and fixed to the starting end support base 53 with screws 55 to be tightened.
As a result, the starting end portion of the band-shaped body 42 is fixed on the starting end portion support base 53 and the starting end portion fixing base 56. At this time, the strip 42
The starting end of the is warped upward by the spacer 56a on the starting end fixing base 56.

Similarly, the end portion of the strip-shaped body 41 which has already been formed into a spiral pipe by the pipe making machine 30 in the manhole 21 is placed and fixed on the spacer 73a on the end portion fixing base 73 and the end portion supporting base 69. Board 7
5 and each fixing plate 71. At this time, the strip 4
The terminating end of No. 2 is warped upward by the spacer 73a on the terminating end fixing base 73.

After that, the screws 55, 59 are arranged so that the end surface of the leading end of the preceding strip 41 warped upward and the end surface of the beginning of the succeeding strip 42 similarly warped upward are in alignment. After loosening a little, the handle 96 of the band position adjusting mechanism is rotated to move the starting end of the subsequent band 42 in the width direction.
When the end face of the strip 42 is aligned with the end face of the preceding strip 41, the lock mechanism 97 is operated to lock the screw rod 93 to restrict its rotation. As a result, in a state where the starting end portion of the succeeding strip-shaped body 42 is fixed on the starting end portion support base 53,
The end face is in a state of being aligned with the end face of the leading end of the belt-shaped body 41.

Then, the strip-shaped body 42 fixed on the starting end fixing base 56 in a state of being warped upward is cut by a cutter, leaving an end extending from the starting end fixing base 56 for a predetermined length. . In this case, the cutter is a fixed plate that is locked to the starting end fixing base 56.
The cut end surface of the strip 42 is moved along the guide portion 58a of the strip 58 and is in a state of being orthogonal to the longitudinal direction of the strip 42. Band-shaped member fixed on the terminal fixing base 73
Similarly, 41 is also cut by a cutter, and its end face is made orthogonal to the longitudinal direction.

In this state, the heating section 82 of the heater 80 is arranged slightly apart from the end surface of the starting end portion of the strip 42 fixed on the starting end fixing base 56. Then, the handle 79 is rotated to bring the pinion gear 78 into rolling contact with the rack 61, and the sliding block 77 is moved to approach the starting end fixed base 56.
When the sliding block 77 moves so as to approach the starting end fixing base 56, the pressing spring 76a externally fitted to the mounting rod 76 presses the end supporting base 69 toward the starting end fixing base 56 side, and the terminal end Support 69
Move in the same direction. With the movement of the terminal end support base 69, the terminal end support base 73, which is integrally connected to the terminal end support base 69 at the block 66, is moved to the starting end portion support base 56 side,
The end surface of the strip-shaped body 41 fixed to the terminal end fixing base 73 along the upper direction is brought into contact with the heating portion 82, and the heating portion 82 is further moved to the end surface of the strip-shaped body 42 which is warped upward. Heating part 82
Abut. When the handle 79 is further rotated in the same direction in such a state, the sliding block 77 moves to the starting end portion fixed base 56 side along the mounting rod 76, and the sliding block 77 presses the pressing spring 76a. . Then, the end face of the end portion of the strip-shaped body 41 fixed to the start end portion support base 56 is pressed by the heating portion 82 by the biasing force of the pressing spring 76a. By arranging the sliding block 77 at a predetermined position on the scale marked on the side surface of the terminal end support base 69, a desired constant pressing force can be constantly applied to the terminal end surface of the strip 41 and the heating section 82. it can.

In this state, the lock mechanism 98 provided on the sliding block 77 locks the gear shaft 78a and restricts its rotation. As a result, the strips 41 and 42 can be brought into contact with the heating unit 81 with a constant pressing force for a predetermined time. Then, by heating the heating portion 82, the end faces of the strip-shaped bodies 41 and 42 that are in contact with the heating portion 82 are melted.

When heating by the heating unit 82 is performed for a predetermined time,
After the lock mechanism 98 is released and the handle 79 is slightly rotated in the reverse direction to separate the ends of the strips 41 and 42 from the heating unit 82, the pressing member 83 and the heating unit 82 are removed from the joining machine 50. . Immediately thereafter, the handle 79 is rotationally operated, and the terminal end supporting base 69 and the terminal end fixing base 73 are moved to the starting end part fixing base 56 side in the same manner as described above. And
The end faces of the strips 41 and 42 are abutted in a melted state. At this time, similarly to the above, the terminal end support base
Using the scale marked on the side surface of 69, the handle 79 is rotated and the terminal end fixing base 73 is further pressed toward the starting end fixing base 56 side so that both are pressurized at a predetermined pressure. Then, the lock mechanism 98 locks the gear shaft 78a to restrict its rotation. As a result, the end faces of the strip-shaped bodies 41 and 42 are pressure-bonded to each other, and both are fused.

In this way, when the leading end portion of the preceding strip 41 and the end portion of the succeeding strip member 42 are connected in a state of being warped upward, the pipe making machine 30 in the manhole 21 is driven again, The pipe making machine 30 produces a spiral pipe. Following the preceding strip 41, the following strip 41 is also continuously introduced into the pipe making machine 30 to form a spiral tube.

At this time, the connecting portion of the strips 41 and 42 is wound in a state of being curved outward to form a spiral tube. Therefore, the stress generated when the strips 41 and 42 are wound is reduced, and there is no possibility that the stress will break the splice.

When each of the strips 41 and 42 is vinyl chloride, the heating temperature for melting the ends is 230 to 270 ° C, preferably 240 to 260 ° C. The pressure applied to each of the melted ends is preferably 2.0 to 4.0 kg / cm ² . In the winter or cold regions, it is preferable to preheat each end of the strip to about 30 to 40 ° C.

The end of the strip 41 and the start of the strip 42 are 5 to
It is warped about 9 degrees. For this reason, the thickness of the spacers 56a and 73a for making the ends of the strips warped is determined as shown in Table 1 by the respective dimensions in the case of the vinyl chloride strip. In addition, the thickness T, the height H, and the width W in the sheet portion of the strip shown in Table 1 are the second
The dimensions are shown in the figure. Each of the spacers 56a and 73a has a length approximately equal to the width dimension of the strip-shaped body and a width of about 20 mm.

(Effect of the Invention) In the method for manufacturing a spiral tube according to the present invention, the starting end of the strip is newly connected to the end of the strip that is a spiral tube in the pipe-making machine. Therefore, the spiral tube can be manufactured without generating the scraps of the strip. Further, since the end portion of the preceding strip and the end portion of the succeeding strip are warped in a direction corresponding to the outside when the spiral tube is formed, when the spiral tube is formed, The stress applied to the connecting portion is reduced, and there is no risk of the connecting portion breaking.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing an implementation state of the method of the present invention, and FIG.
FIG. 4 is a cross-sectional view of the strip, FIG. 3 is a perspective view of the strip connecting device of the present invention, FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is V of FIG. Fig. 6 is a sectional view taken along line -V, Fig. 6 is a sectional view taken along line VI-VI in Fig. 3, and Fig. 7 is a side view showing its usage. 30 …… Pipe making machine, 40 …… Spiral tube, 41, 42 …… Band, 43 …… Band drum, 5 …… Band connecting device, 50 …… Joining machine, 51 ……
Frame, 53 ... Starting end support, 53a ... Positioning ridges, 54, 58
...... Fixing plate, 56 …… Starting point fixing base, 56a …… Spacer, 61…
… Rack, 62, 64 …… Guide rod, 69 …… End support, 69a
…… Positioning ridges, 71,75 …… Fixing plate, 73 …… Terminal fixing base, 73a …… Spacer, 76 …… Mounting rod, 76a …… Pressing spring, 77…
… Sliding block, 78 …… Pinion gear, 80 …… Heating device, 8
2 …… Heating part, 91 …… Adjustment block, 92 …… Guide block, 93 …… Screw rod.

Claims (1)

[Claims] 1. An end portion of a preceding synthetic resin strip which is introduced into a pipe making machine and is made into a spiral tube by the pipe making machine, and a subsequent synthetic resin which is to be connected to the end portion of the strip. The steps of aligning the starting ends of the strips with each other in a state corresponding to the outward direction in the case of a spiral tube so as to be aligned and facing each other, and heating the ends of the strips facing each other, respectively. And melting the melted ends, and joining the melted ends together at a predetermined pressure to bond the strips together, the end of the preceding strip, and the end of the strip. A method for producing a spiral tube, comprising the steps of continuously introducing the connected end portions of the strips into the tube manufacturing machine to form a spiral tube by the pipe manufacturing machine.