JPH08151677A - Synthetic resin u-shaped ditch and its manufacture - Google Patents

Abstract

PURPOSE: To produce U-shaped ditches of any length efficiently by forming synthetic resin U-shape ditches in the bottom of which soil and dirt are difficult to be accumulated and which can be connected at any angle and by blow molding by continuous extraction. CONSTITUTION: A synthetic resin U-shaped ditch forms a close-fit receiving part 3 for connection, of which both right and left side surfaces are bent in arc shape toward the outside, at one end of a U-shaped ditch main body 1 formed by depositing the bottom part 6b of a wave form outer wall 6 to the outer surface of the inner wall of roughly U-shape in cross- section. Also it forms a close-fit inserting part 4, capable of close-fitting and connecting to the close-fit receiving part 3 rotatably in horizontal direction, at the other end. For manufacturing, a cylindrical formed bodies in which U-shaped ditch collecting tube parts with a structure that the upper edges of the U-shaped ditches are connected to each other so that they form a cylindrical body by opposing the U-shaped ditch main bodies 1 are connected to each other in the axial direction are blow-molded by continuous extrusion using synthetic resin, and the cylindrical formed bodies are cut and separated for each U-shaped ditch. The length of the U-shaped ditches is adjusted by varying a timing (interval) to intermittently insert divided auxiliary forms which are provided with a close-fit receiving part 3 form and a close-fit inserting part 4 form between the divided main forms provided with wave form outer wall forms.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin U-shaped groove used as a side groove of a road or a drain groove of a golf course, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Most conventional U-shaped grooves are made of concrete. However, since the U-shaped groove made of concrete is heavy and difficult to carry, the U-shaped groove made of synthetic resin has been used in recent years, and in particular, the groove wall was formed into a corrugated shape to improve the strength. The U-shaped groove is used as a prize.

[0003]

However, since the U-shaped groove formed by corrugating the groove wall has dirt and dust at the bottom, it is troublesome to clean and remove it. Moreover, this U-shaped groove cannot be efficiently manufactured by continuous extrusion molding because the groove wall is corrugated, and cannot be efficiently manufactured by continuous blow molding because it is not a tubular body. There was a problem. Therefore, it is mainly manufactured by press molding or vacuum or air pressure molding, but it is difficult to manufacture a long U-shaped groove by such a molding method.
When manufacturing a U-shaped groove having a fitting receiving portion and a fitting portion for connection at both ends, the mold must be changed every time the length of the U-shaped groove changes, so the mold cost is high and the manufacturing cost is high. However, there was a problem that it greatly increased.

The present invention has been made in view of the above problems. An object of the present invention is to make a synthetic resin U-shaped groove in which dirt and dust are unlikely to collect at the groove bottom and which can be connected at a desired angle. What length U can be obtained by continuous extrusion blow molding
An object of the present invention is to provide a manufacturing method capable of efficiently manufacturing even a groove.

[0005]

In order to achieve the above object, the synthetic resin U-shaped groove of the present invention has a U-shaped groove formed by fusing a trough portion of the corrugated outer wall to the outer surface of the inner wall having a substantially U-shaped cross section. A U-shaped groove main body is formed, and at one end of the U-shaped groove main body, a fitting receiving portion for connection in which both left and right side surfaces are curved outward in an arc shape is formed, and at the other end of the U-shaped groove main body, the fitting receiving portion is formed. It is characterized in that a fitting portion for connection which can be horizontally rotatably fitted and connected is formed.

Further, according to the manufacturing method of the present invention, the fitting receiving portion and the fitting portion for connection are provided at both ends of the U-shaped groove main body in which the valley portion of the corrugated outer wall is fused to the outer surface of the inner wall having a substantially U-shaped cross section. A plurality of U-shaped grooves formed to face each other so that each U-shaped groove is formed.
Continuous extrusion blow molding of a cylindrical molded body in which the U-shaped groove collecting cylinders of the structure in which the upper edges of the groove are joined together in the axial direction is continuously extruded by blow molding, and this cylindrical molded body is cut into each U-shaped groove. It is characterized by separation. And, in a preferred embodiment, while the plurality of divided main forming dies having the corrugated outer wall forming surface are circulated along the circulation orbit, the divided main forming dies are abutted around the extrusion port of the blow molding machine and continuously forward. And move the split sub-molding with the receiving surface and the fitting surface to intermittently cut between the split main molding dies while abutting around the extrusion opening. The outer wall parison that is moved forward with the mold and continuously extruded from the first extrusion port of the blow molding machine is divided by the blow pressure into the corrugated outer wall molding surface of the main molding die and the fitting receiving surface of the split sub molding die. While pressing on the molding surface of the fitting part, the inner wall parison continuously extruded from the second extrusion port to the inside of the outer wall parison is pressed by blow pressure to the trough, fitting part and fitting part of the outer wall parison. The above cylindrical molded body can be continuously Out is to blow molding.

[0007]

The synthetic resin U-shaped groove of the present invention has a large strength because the U-shaped groove main body is a double-walled structure composed of an inner wall having a substantially U-shaped cross section and a corrugated outer wall, and is smooth and not corrugated. Since it has a large inner wall, dirt and dust are unlikely to collect at the bottom of the groove, allowing smooth drainage. Then, at one end of the U-shaped groove main body, a fitting receiving portion whose left and right side surfaces are curved outward in an arc shape is formed, and at the other end, a fitting portion which can be horizontally rotatably fitted and connected is formed. Therefore, the U-shaped groove can be connected at a desired angle by horizontally rotating the fitting portion.

Further, in the manufacturing method of the present invention, first, a U-shaped groove collecting cylinder is formed into a cylindrical molded body which is continuous in the axial direction, and this U-shaped groove is cut and separated into individual cylindrical molded bodies. Can be efficiently and continuously molded by continuous extrusion blow molding. Moreover, as in the preferred embodiment, a plurality of split main molding dies having a corrugated outer wall molding surface are intermittently interrupted by a split sub-mold having a fitting portion molding surface and a fitting portion molding surface. When continuous extrusion blow molding is performed by simply changing the timing (interval) at which the split sub-molds are interrupted, a short U-shaped groove collecting cylinder is made continuous from a long U-shaped groove collecting cylinder being made continuous. Since a tubular molded body can be molded freely, U can be cut by cutting it into individual U-shaped grooves.
From the long U-shaped groove of the groove body to the short U-shaped groove of the desired length
Grooves can be manufactured.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a synthetic resin U-shaped groove according to an embodiment of the present invention, FIG. 2 is a side view of the U-shaped groove, and FIG.
FIG. 4 is a vertical sectional view of the U-shaped groove, and FIG. 4 is a horizontal sectional view of the U-shaped groove.

This U-shaped groove 1 made of synthetic resin comprises a U-shaped groove body 2
The fitting receiving portion 3 for connection is formed at one end, and the fitting fitting portion 4 for connection is formed at the other end.

The U-shaped groove main body 2 has a structure in which the outer wall of the inner wall 5 having a substantially U-shaped cross section is fusion-bonded with the troughs 6b of the corrugated outer wall 6 in which the peaks 6a and the troughs 6b are alternately arranged. are doing.

The inner wall and the outer wall of the fitting receiving portion 3 are integrally laminated to have a thick wall, and the left and right side surfaces 3a, 3a are curved outward in an arc shape and the bottom surface 3b is corrugated. It is formed so as to protrude by the same amount as the mountain portion 6a of the outer wall 6. On the other hand, the fitting portion 4 is configured such that the left and right side surfaces 4a, 4a of the end portion of the inner wall 5 are curved outward in a small arc shape and the peak portion 6c of the end portion of the corrugated outer wall 6 is formed to be small. It is configured so that it can be horizontally rotatably fitted and connected to the receiving portion 3.

Further, an L-shaped step portion 7 is formed on the upper left and right upper edges of each of the U-shaped groove body 2, the fitting receiving portion 3, and the fitting portion 4, and the L-shaped step portion 7 has a groove lid ( (Not shown) and the like can be placed.

As the synthetic resin of the material, for example, polyethylene, polyvinyl chloride, or other thermoplastic resin is used.

The U-shaped groove made of synthetic resin having such a structure is U
Since the groove body 2 is a double-wall structure consisting of the corrugated outer wall 6 and the inner wall 5 in which the peaks 6a and the valleys 6b are alternately connected, the strength is great and there is a concern that it will be damaged by earth pressure when buried in the ground. There is no. Moreover, since there is a smooth inner wall 5 which is not corrugated, dirt and dust are unlikely to accumulate at the groove bottom, and the water can be smoothly drained. In addition, the left and right side surfaces 3
A fitting portion 3 in which a and 3a are curved outward in an arc shape is formed, and a fitting portion 4 which can be fitted and connected to the other end so as to be horizontally rotatable.
Since the insertion portion 4 is formed, the fitting portion 4 can be horizontally rotated to connect the U-shaped groove at a desired angle, as shown by an imaginary line in FIG.

In the above embodiment, the mountain portion 6a of the outer wall 6 has a slightly widened shape as shown in FIG. 4, but may have a widened shape. When the mountain portion 6a is spread downward, there is an advantage that the U-shaped groove 1 can be prevented from floating due to earth pressure when it is buried in the ground.

Next, an embodiment of the manufacturing method of the present invention will be described with reference to FIGS.

In this embodiment, first, a cylindrical molded body 100 in which U-shaped groove collecting cylindrical portions 10 as shown in FIG. 10 are continuous in the axial direction is continuously extrusion blow molded with a synthetic resin. This U
The U-shaped groove collecting tubular portion 10 joins the L-shaped step portions 7, 7 at the upper edge of each U-shaped groove 1 so that the above-mentioned two synthetic resin U-shaped grooves 1 face each other and form a tubular body. It is a cylindrical portion having a structure.

Next, the continuous extrusion blow molding of the above-mentioned tubular molded body 100 is cut and separated into individual U-shaped grooves 1 to manufacture synthetic resin U-shaped grooves 1. That is, the tubular molded body 100 is radially cut at an intermediate portion A between the fitting portion 3 and the fitting portion 4 to be divided into the U-shaped groove collecting cylinder portions 10, and the U-shaped groove collecting cylinder portion 10 is also divided. The joint portions B, B of the L-shaped step portions 7 are cut in the axial direction to separate into two U-shaped grooves 1, 1.

The continuous extrusion blow molding of the above-mentioned cylindrical molded body 100 is efficiently performed as follows. That is, as shown in FIGS. 5 and 6, a large number of split main forming dies 11 each having a corrugated outer wall forming surface 11a are provided on the left and right circulation tracks 12, 1.
While circulating along 2, the split main forming dies 11 are brought into abutment with each other around the extrusion port of the blow molding machine 13 one by one, and continuously moved forward. Then, the split sub-molding die 14 having the fitting portion molding surface 14a and the fitting portion molding surface 14b is retracted to the left and right retracting tracks 15, 15, and the split sub-molding die 14 of the split main molding die 11 is saved. Split main molding die 1 by intermittently interposing one pair between them and abutting them around the extrusion port.
Move forward with 1.

While moving the main split mold 11 and the secondary split mold 14 in this manner, the heat-softened outer wall parison 16 is continuously extruded from the first extrusion port 13c of the blow molding machine 13 to provide an air supply passage. The outer wall parison 16 is divided by the blow pressure of the air blow sent from 13a to the outer corrugated outer wall molding surface 11a of the main molding die 11 and the fitting receiving surface 1 of the split auxiliary molding die 14.
4a and the fitting portion molding surface 14b. Along with that
Inner wall parison 17 heat-softened from the second extrusion opening 13d
Is continuously extruded to the inside of the outer wall parison 16, and the inner wall parison 17 is moved to the valley portion 6b of the outer wall parison 16 by the blow pressure of the air blow sent from the other air supply passage 13b.
Then, they are pressed against the troughs of the fitting receiving portion 3 and the fitting portion 4 to be fused.

When continuous extrusion blow molding is performed as described above,
The split main molding die 11 molds each U-shaped groove main body 2 of the U-shaped groove collecting cylinder portion 10 shown in FIG. 10, and the split sub-molding die 14 molds the U-shaped groove collecting cylinder portion 10.
Since the respective fitting receiving portion 3 and fitting portion 4 are continuously molded, the tubular molded body 100 can be efficiently molded.

The tubular molded body 100 that is continuously extrusion blow molded in this embodiment has two U-shaped grooves 1 and 1 facing each other as shown in FIG. 10 and FIG. U
U of the structure in which the L-shaped step portions 7, 7 at the upper edge of the character groove 1 are joined
The grooved aggregate tubular portion 10 is connected in the axial direction. The tubular molded body in which the U-shaped groove aggregated tubular portion 10 having the structure shown in FIG. 8 or 9 is axially extended is continuously extruded by blow molding. You may.

That is, the U-shaped groove collecting cylinder portion 10 shown in FIG.
The four U-shaped grooves 1 are vertically and horizontally opposed to each other, and the L-shaped step portions 7, 7 at the upper edges of the adjacent U-shaped grooves are joined to form a tubular body. In the U-shaped groove collecting cylinder portion 10 shown in FIG. 9, four U-shaped grooves 1 are arranged in two steps in an upper and lower direction so as to face each other, and L-shaped step portions 7, 7 are formed so as to form a cylindrical body in the same manner.
It has a structure in which the two are joined together. These things are also L
It goes without saying that the joint portion B of the mold step portions 7, 7 can be cut to be separated into individual U-shaped grooves 1.

As described above, in this manufacturing method, first, U
A tubular molded body 100 in which the groove assembly cylinder portion 10 is continuous in the axial direction.
Therefore, the tubular molded body 100 can be efficiently continuously molded by continuous extrusion blow molding, and
By simply changing the timing (interval) for intermittently cutting the split sub-molding dies 14 between the split main molding dies 11, the long U-shaped groove collecting cylinder 10 is continuously connected to the short cylindrical U-shaped molding 100. Cylindrical molded body 10 in which the groove assembly cylindrical body 10 is continuous
Since it can be freely molded up to 0, by cutting and separating it into individual U-shaped grooves 1, the long U-shaped groove 1 of the U-shaped groove body 2 can be formed.
It is possible to easily and inexpensively manufacture the U-shaped groove 1 having a desired length from a short length to a short length.

[0027]

As is clear from the above description, the synthetic resin U-shaped groove of the present invention has high strength and is free from the risk of damage due to earth pressure and the like, and does not collect dirt or dust at the groove bottom. It is possible to smoothly drain water and to connect the U-shaped grooves at a desired angle.

Further, according to the manufacturing method of the present invention, it is possible to efficiently form a tubular molded body in which the U-shaped groove collecting tubular portions are continuous in the axial direction by continuous extrusion blow molding, and to divide between the divided main forming dies. By changing the timing (interval) at which the mold is interrupted intermittently and cutting and separating the continuous extrusion blow-molded tubular molded body into individual U-shaped grooves, the desired length from long U-shaped grooves to short ones can be obtained. It has a remarkable effect that the U-shaped groove can be efficiently and easily manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a plan view of a synthetic resin U-shaped groove according to an embodiment of the present invention.

FIG. 2 is a side view of a synthetic resin U-shaped groove of the same embodiment.

FIG. 3 is a vertical cross-sectional view of a synthetic resin U-shaped groove of the same embodiment.

FIG. 4 is a cross-sectional view of a synthetic resin U-shaped groove of the same embodiment.

FIG. 5 is an explanatory diagram of a molding die used in the manufacturing method according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram of the manufacturing method according to the embodiment.

7 is a cross-sectional view of FIG.

FIG. 8 is a diagram showing another example of a tubular molded body that is subjected to continuous extrusion blow molding.

FIG. 9 is a view showing still another example of a tubular molded body that is subjected to continuous extrusion blow molding.

FIG. 10 is a partial perspective view of a tubular molded body that is subjected to continuous extrusion blow molding in the above embodiment.

[Explanation of symbols]

 1 U-shaped groove made of synthetic resin 2 U-shaped groove main body 3 Fitting portion for connection 3a Left and right side surfaces of fitting portion 4 Fitting portion for connection 4a Left and right side surfaces of fitting portion 5 Inner wall 6 Corrugated outer wall 6a Mountain portion 6b Valley part 7 Upper edge L-shaped step part 10 U-shaped groove collecting cylinder part 11 Divided main molding die 11a Corrugated outer wall molding surface 13 Blow molding machine 14 Divided sub-molding die 14a Fitting part molding surface 14b Fitting part molding surface 16 External wall parison 17 Internal wall parison

Claims (3)

[Claims] 1. A U-shaped groove main body is formed by fusing a trough portion of a corrugated outer wall to an outer surface of an inner wall having a substantially U-shaped cross section, and one side of the U-shaped groove main body has both left and right side surfaces circularly outward. A fitting part for connection which is curved in an arc shape is formed, and a fitting part for connection which can be fitted and connected to the fitting part so as to be horizontally rotatable is formed at the other end of the U-shaped groove body. U-shaped groove made of synthetic resin. 2. A plurality of U-shaped groove main bodies in which a trough portion of a corrugated outer wall is fused to an outer surface of an inner wall having a substantially U-shaped cross section and a fitting receiving portion and a fitting portion for connection are formed at both ends thereof. With U-shaped grooves facing each other,
A tubular molded body in which the U-shaped groove collecting tubular portions having a structure in which the upper edges of the U-shaped grooves are joined so as to form a tubular body is continuous in the axial direction is continuously extruded by blow molding using a synthetic resin, and this tubular molding is performed. Each U
U made of synthetic resin characterized by cutting and separating for each groove
Method of manufacturing a groove. 3. A plurality of divided main forming dies having a corrugated outer wall forming surface are circulated along a circulation orbit while abutting the divided main forming dies around the extrusion port of the blow molding machine so as to be continuously forward. Along with the movement of the split main forming die, the split sub-forming die having the receiving surface of the receiving portion and the forming surface of the receiving portion is intermittently interrupted between the split main forming die and abutted around the extrusion port. The outer wall parison, which is moved forward and continuously extruded from the first extrusion port of the blow molding machine, is divided by the blow pressure into the corrugated outer wall molding surface of the main molding die and the fitting receiving surface and fitting of the split sub molding die. The inner wall parison is continuously extruded from the second extrusion port to the inside of the outer wall parison from the second extrusion port and is blown to the outer wall parison to the valley part, the receiving part and the fitting part to melt it. The continuous extrusion blow molding of the cylindrical molded body The method according to claim 2, symptoms.