JP3002774B2 - Culvert pipe and its manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a buried underground,
The present invention relates to a culvert pipe used for ground improvement and a manufacturing device therefor.

[0002]

2. Description of the Related Art Conventionally, underdrain pipes of this type have been integrally formed of synthetic resin into a cylindrical shape having a large number of through holes in the periphery thereof. In some cases, a core material is embedded, or reinforcing ribs are provided at predetermined intervals.

[0003] In addition, as a manufacturing method, a cylindrical body having a fixed length and having a through hole therearound is formed by a mold and connected with a joint or the like, or as shown in FIG. As in the invention of 134883, after a hole 10a is formed in an appropriate position of a soft synthetic resin band-shaped sheet 10, the hole 10a is rounded in the vertical direction, and both ends are heated and welded. .

[0004] Further, as a manufacturing apparatus, when a pipe is divided into a plurality of parts, a conventionally known ordinary mold is used, and when a pipe is continuously formed, it is shown in FIG. A punching roll 12 for forming a through hole 10a in the synthetic resin strip sheet 10 continuously with a die of an extruder 11 for extruding the synthetic resin strip sheet 10,
A rounding die 13 for rolling the band-shaped sheet 10 into a tube, a heating device 14 for heating the edge of the band-shaped sheet 10 rounded into a tube, and a sizing die for welding the both ends to form a final cylinder. 15 were arranged linearly.

[0005]

The conventional underdrain pipe described above has a large number of through-holes in the peripheral wall, so that the pressure resistance of the pipe itself is reduced, and the pipe is crushed when buried in the soil. There is a possibility that the function may not be exhibited. In order to prevent this, steel wires are buried or reinforcing ribs are provided at predetermined intervals.However, since the pipe itself is the same as the above, the steel wires and reinforcing ribs are also used. In the places where there is not, the same problem as above occurs,
In addition, there is a problem in that it takes time and effort to reinforce, thereby lowering the productivity and increasing the cost of the product. Furthermore, in this culvert pipe, if the thickness of the synthetic resin itself is increased, the pressure resistance is improved, but on the other hand, the flexibility is impaired, which not only hinders the embedding work but also reduces the pipe diameter. Can not be wound up,
There has been a problem that transportation and storage are also difficult.

In the manufacturing method, when a cylindrical body having a fixed length is formed by a mold and connected by a joint or the like, it is necessary to wait for the molds to cool down and take out the molded product during molding. In addition, the productivity is poor, and the work of connecting the formed pipes with a joint or the like is required, which has a problem that it is troublesome. Further, in the method shown in FIG. 5, continuous work is possible, but in order to improve the pressure resistance, the resin thickness must be increased, which makes molding difficult and reduces flexibility. The culvert pipe manufactured by this method is limited to a relatively small-diameter simple pipe. Furthermore, in this manufacturing method, if the quality and temperature control of the resin material are not strictly controlled, there is a possibility that the through-hole may be closed or the diameter of the through-hole may be reduced at the time of molding into a cylindrical shape. However, there is a problem that it is difficult to accurately mold the material.

Further, in a manufacturing apparatus, when a normal mold is used, the pipe must be divided into a plurality of pieces and molded. Must be taken out, and the production work efficiency is poor. In the manufacturing apparatus shown in FIG. 5, a culvert pipe having a through hole can be continuously formed.
Since the strength of the molded pipe is determined by the material and thickness of the synthetic resin used as the material, there has been a problem that a culvert pipe having both flexibility and pressure resistance cannot be manufactured in one process.

An object of the present invention is to solve the above problems.

[0009]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is characterized in that a synthetic resin is integrally fused to both ends of a belt-shaped net, On both surfaces, a belt-like body formed by fusing a synthetic resin reinforcing rib continuous with the synthetic resin at both ends in a zigzag shape is spirally wound, and the end faces thereof are fused together to form a tubular culvert pipe. It was done.

According to a second aspect of the present invention, in the configuration of the first aspect, the shape of the band is limited to a substantially parallelogram in cross section.

According to a third aspect of the present invention, in the configuration of the first or second aspect of the present invention, the end faces of the belt-shaped body are different from each other.
The present invention is characterized in that a configuration is added in which fusion is performed via a soft synthetic resin.

[0012]

[0013]

According to a fourth aspect of the present invention, there is provided an extruder for extruding a synthetic resin integrally joined to both ends of a net having a band-shaped net insertion portion, and a belt-shaped body extruded from the extruder. An apparatus for manufacturing a culvert pipe, comprising: an extruder that extrudes a soft synthetic resin for joining toward an end surface; and a winder that spirally winds a belt-like body extruded from the both extruders. is there.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on the illustrated embodiments.

FIG. 1 is a sectional view of a culvert pipe 1 according to the present invention, and FIG. 2 is an enlarged view of a main part thereof. As shown in the figure, the culvert pipe 1 is formed by spirally winding a long strip 2.
It is formed in a cylindrical shape. As shown in the plan view of FIG. 3, the band 2 sandwiches the band 3
Synthetic resin is integrally fused on both sides,
The section is formed in a substantially parallelogram shape. The end faces of the strip 2 are fused together via the soft synthetic resin 4. Further, on the upper surface of the net 3, reinforcing ribs 5a which are continuous with the synthetic resin on both sides by fusing synthetic resin in a zigzag manner are provided.
And a similar rib 5b is provided so as to intersect with.

The net 3 may be made of metal or fiber as long as it has water permeability, and the roughness of the mesh may be appropriately determined according to soil conditions, use conditions, and the like. Good. In the above description, the example in which the reinforcing ribs 5a and 5b are provided on the upper and lower surfaces of the net 3 has been described.
If is made of metal and has sufficient strength, it is not always necessary to provide the ribs 5a and 5b.

The culvert pipe 1 of the present invention has the above-described structure and is used by being buried in the soil. And the work is
The net 3 provided in the center of the belt 2 serves as a water permeable portion, from which surplus water in the soil flows into the inside, and the flowed water is quickly guided to the outside through the culvert pipe 1, thereby draining the field or the like. It is intended to improve the properties and improve the ground. In addition, the culvert pipe 1 of the present invention may be used by being buried vertically in the soil, for example, along or near the wall of a steel sheet pile driven into the ground, in the vertical direction. By arranging them at a location, they can be used as drainage materials for liquefaction countermeasures that dissipate excess pore water pressure.

Next, a method of manufacturing the underdrain pipe 1 of the present invention using the above-mentioned band-like body will be described based on a manufacturing apparatus shown in FIG.

FIG. 4A shows an extruder for continuously forming the above-mentioned band-shaped body 2, which is melted in conjunction with the drawing out of the band-like net 3 drawn out from an insertion portion (not shown) provided in the die D. The resin is extruded to continuously form a band 2 having a substantially parallelogram cross section in which both sides of the net 3 are covered with a synthetic resin. This strip 2 is placed on the front side of the extruder A (FIG. 4).
Is wound spirally by a winder C provided on the upper side of the belt 2 and sequentially fed to the right in the drawing. Prior to this winding, an extruder B separately provided on the end face of the band 2 is provided. The bonding soft synthetic resin 4 extruded from above is attached. As a result, the end surfaces of the wound strip 2 are fused together via the soft synthetic resin 4 to form a tubular shape. If the pitch of this winding is changed, the diameter of the formed culvert pipe can be easily changed.

The culvert pipe 1 thus formed
Is that the spirally wound strip 2 is fused via the soft synthetic resin 4, so that a certain degree of flexibility can be obtained in this part, In this case, the end faces are obliquely in contact with each other and have sufficient pressure resistance. Therefore, even when buried in the soil, the soil does not collapse or deform significantly due to the earth pressure, and surplus water in the soil flows into the inside from the net 3, and the flowed water is discharged through the culvert pipe 1 to the outside. Will be surely led to

In the above description, an example is shown in which the strip 2 is formed in a substantially parallelogram cross section in order to achieve both flexibility and pressure resistance, and its end faces are fused with the soft synthetic resin 4. If the culvert pipe 1 itself has a small diameter, it is unlikely to be crushed, so that the strip 2 itself can be formed of a soft synthetic resin. In this case, the end faces of the strip 2 may be directly fused to each other. Also, the cross section does not necessarily have to be a parallelogram.

As described above, according to the first aspect of the present invention, the net is reinforced with zigzag ribs.
Since a strip with synthetic resin fused at both ends was spirally wound into a culvert pipe, a net with excellent water permeability but with a problem in strength could be used for the culvert pipe. The use of this net has the effect that culvert pipes having characteristics according to various soil conditions can be manufactured.

According to a second aspect of the present invention, in addition to the effect of the first aspect of the present invention, further improvement in pressure resistance and improvement in bonding strength are achieved by forming the belt-like body into a substantially parallelogram cross section. Peel off.

According to a third aspect of the present invention, the flexibility of the culvert pipe is improved by fusing the end faces of the belt-like body with each other via a soft synthetic resin. In addition to the effect of the above, the workability at the time of burying work is improved.
In addition, it can be wound up compactly, so that it can be easily transported and the storage space can be reduced.

[0026]

[0027]

[0028] The invention according to claim 4 relates to a manufacturing apparatus.
By using this apparatus, the underdrain pipe according to claim 3 having both pressure resistance and flexibility can be continuously and efficiently manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view of a culvert pipe according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a plan view of a strip used in the present invention.

FIG. 4 is a plan view showing an apparatus for manufacturing a culvert pipe according to the present invention.

FIG. 5 is a perspective view showing a conventional example of a manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Culvert pipe 2 Belt 3 Net 4 Soft synthetic resin 5a, 5b Rib

Continuation of the front page (56) References JP-A-64-1814 (JP, A) JP-A-53-27239 (JP, A) JP-A-50-141810 (JP, A) JP-A-4-213611 (JP) JP-A-3-187410 (JP, A) JP-A-2-11832 (JP, U) JP-A-62-196234 (JP, U) JP-A-59-183918 (JP, U) JP-A 1-124836 (JP, U) Japanese Patent Publication No. 7-122256 (JP, B2) Jikken Sho 54-27206 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02B 11/00 301

Claims (4)

(57) [Claims] 1. A synthetic resin is integrated at both ends of a belt-shaped net.
At the top and bottom of the net
Zigzag reinforcing ribs made of synthetic resin that are continuous with the synthetic resin
A culvert pipe characterized by being formed into a tubular shape by spirally winding a belt-like body fused in a shape and fusing the end surfaces thereof. 2. The underdrain pipe according to claim 1, wherein the belt-like body has a substantially parallelogram cross section. 3. The culvert pipe according to claim 1, wherein the end faces of the belt-like body are fused with each other via a soft synthetic resin. 4. An extruder having a band-shaped net insertion portion and extruding a synthetic resin integrally joined to both ends of the net, and an extruder for joining toward an end face of the band extruded from the extruder. An extruder for extruding the soft synthetic resin described above, and a winding machine for spirally winding the strip extruded from both extruders, are provided.