JPH0413152Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a band-shaped body for forming a spiral pipe used for duct pipes, water and sewage pipes, transport pipes, etc.

(Prior Art) Recently, instead of synthetic resin tubes obtained by conventional extrusion molding methods, synthetic resin tubes having longitudinal mutually engaging ribs on both ends are spirally wound. So-called synthetic resin pipes are being used as piping materials for ducts, transportation, drainage, etc.

The characteristics of this spiral pipe are: (1) The belt-shaped body rolled into a single roll is transported to the site, and simple pipe manufacturing equipment (for example,
55-61434, published patent No. 57-501229, etc.), it can be made into a tube by simply winding it in a spiral on-site, so there is no need to create a tube like in the past. There are advantages that there is no need for transportation, the transportation cost is low, and (2) a tube of any diameter can be easily obtained.

And, as the band-shaped body for forming the spiral tube,
For example, in Japanese Patent Application Laid-open No. 54-65780, the fourth
As shown in the figure, along the longitudinal direction of the base 1', there is an engaging rib 2' on one side and a socket 3' on the other side. It has a plurality of upright ribs 4' each having a flange 4a' on its free end side, and an auxiliary locking rib 5' integrally extending laterally outward from the socket 3'. something is disclosed. Conventionally, when forming a tube body by spirally winding the synthetic resin band body, for example, published patent No. 57
As described in Publication No. 501229, there is an adhesive method in which a solvent-based adhesive is applied to the surface of the engagement rib immediately before wrapping, or a method in which the engagement rib of the strip and the socket are heated. A heat fusion method is used to wrap the material while it is in a molten state.

(Problem to be solved by the invention) However, in a spiral pipe obtained by spirally wrapping the above-mentioned band-shaped body using adhesive, for example, the spiral pipe is used as a duct pipe or a water and sewage pipe. In this case, as shown in Figure 4, due to the effects of vibration of the blower or fluctuations in internal water pressure,
A tensile force acts in the axial direction (direction of the arrow) of the helical tube, and part A near the base 1' of the socket 3' deforms as shown by the broken line due to the creep phenomenon, and finally the socket 3' engages. It has the disadvantage that it comes off from the rib 2'.

The present invention is intended to solve the above-mentioned conventional problems, and its purpose is to provide a helical tube-forming band-shaped body that can obtain a helical tube having an engaging portion with excellent vibration resistance and internal pressure resistance. Our goal is to provide the following.

(Means for Solving the Problems) The belt-shaped body for forming a spiral tube of the present invention has an engaging rib on one side and a socket on the other side along both longitudinal edges of the base, and the engaging rib and the socket are connected to each other. A helical tube is formed by winding a band-shaped body having longitudinal upright ribs standing upright from the base in a spiral manner so that the engaging ribs and the socket engage with each other, and from the socket to the socket. A reinforcing rib in the longitudinal direction is integrally extended and is hooked onto an upright rib adjacent to the holder.

(Function) Since the reinforcing ribs are extended from the socket and hooked onto the upright ribs adjacent to the reinforcing ribs, the engagement portion of the helical tube formed by winding the strip in a spiral shape, especially the base side of the socket, This prevents deformation due to the creep phenomenon that occurs in

(Example) Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 is a partially omitted cross-sectional view showing an embodiment of a strip for forming a spiral tube according to the present invention.
1 is a band-shaped body made of hard synthetic resin such as hard vinyl chloride resin, and an engagement rib 3 is provided at one end edge in the longitudinal direction of a long flat base 2;
A socket 4 is integrally provided at the other end edge in the longitudinal direction. The engagement rib 3 and the socket 4 are each provided upright from the base 2. The engagement rib 3 is composed of an upright portion 31 and an engagement portion 32 connected to the tip of the upright portion 31. The socket 4 receives the engagement rib 3,
Its inner surface shape is designed to approximately correspond to the outer surface shape of the engaging rib 3.

5, 5... are upright ribs, each having a T-shaped cross section and consisting of an upright portion 51 and a flange portion 52, which stand upright from the base 2 between the engagement rib 3 and the socket 4 and are spaced apart from each other by a predetermined distance. A plurality of strips are provided in the longitudinal direction.

Reference numeral 6 denotes a diagonal rib, which is provided to extend outward from the lower side of the socket 4. The diagonal ribs 6 may be continuous in the longitudinal direction or may be discontinuous.

The extension length and extension angle of the diagonal rib 6 are such that, when engaged, the tip of the diagonal rib 6 is latched to the intersection of the upright portion 51 and flange portion 52 of the upright rib 5 adjacent to the engagement rib 3. The distance between the engaging ribs 3 and the upright ribs 5 may be determined according to the height of the upright ribs 5.

The diagonal rib 6 has the effect of supplementarily increasing the engagement strength of the engagement portion, and may be provided as necessary.

Reference numeral 7 denotes a reinforcing rib that continues in the longitudinal direction, and is provided so as to extend integrally from the base side of the socket 4 toward the intersection between the upright portion 51 of the adjacent upright rib 5 and the flange portion 52. The extension length and extension angle of the reinforcing rib 7 are adjusted according to the distance between the socket 4 and the upright rib 5 and the height of the upright rib 5 so that the tip of the rib 5 is close to the intersection. Bye. The reinforcing ribs 7 may be discontinuous in the longitudinal direction. Further, the reinforcing rib 7 may be integrally joined and latched to the intersection portion.

The reinforcing rib 7 is attached to the engagement part of the helical pipe, especially the socket 4.
This has the effect of preventing deformation due to the creep phenomenon that occurs on the base side of the base.

FIG. 2 shows another embodiment of the present invention, in which one end of the flange portion 52a of the upright rib 5a adjacent to the socket 4 and the socket 4 are connected to the reinforcing rib 7a.
A hollow part 8 is formed by bridging the two parts. In this case, the stiffness of the socket 4 is increased by the bridging of the reinforcing ribs 7a, and deformation due to the creep phenomenon occurring on the base side of the socket 4 is effectively prevented.
Further, it is more effective if the hollow portion 8 is filled with a synthetic resin foam such as polyurethane resin (not shown). The bridging portion is not limited to the flange portion 52a, but may be the upright portion 51a.

In order to form the strip in the present invention into a spiral tube, for example, a cylindrical mandrel having a desired diameter is used, and the engaging ribs 3 and sockets 4 of the strip 1 are engaged with each other on the outer surface of the mandrel. Just wrap it in a spiral shape while twisting it. FIG. 3 is a partial cross-sectional view showing the engagement part in a state where the strip 1 shown in FIG. 1 is spirally wound. This is prevented by the tensioning action of the protruding reinforcing ribs 7, forming an engaging portion with excellent vibration resistance and internal pressure resistance.

In addition, in the present invention, the cross-sectional shape of the engaging rib 3 may be any shape other than the one shown in the drawings; for example, the locking portion 32 may have a rectangular shape such as a triangle, or may have an uneven surface. It can be something. Also. Alternatively, the groove formed between the upright ribs 5 may be filled with a synthetic resin foam or the like for reinforcement or heat insulation. The thickness of the strip 1 is appropriately determined depending on the use of the spiral tube.
For example, in the case of duct pipe material, it is about 0.3 mm to 3 mm.
In the case of drainage pipe material, it may be about 2 to 10 mm.

Furthermore, if a through hole (not shown) is provided in the flat base 2 between the upright ribs 5, it can be used as a water collection pipe.

The strip 1 is formed using a thermoplastic resin such as a hard vinyl chloride resin or an olefin resin, and is press-molded using a mold having a profile corresponding to the cross-sectional shape of the strip.

(Effects of the invention) The strip for forming a spiral tube of the present invention is constructed as described above, and is provided with reinforcing ribs in the longitudinal direction that are hooked onto adjacent upright ribs and extend integrally from the socket. Deformation due to the creep phenomenon that occurs in the engaging portion, particularly on the base side of the socket, is prevented by the tensioning action of the reinforcing ribs, and it is possible to obtain a helical tube having an engaging portion with excellent vibration resistance and internal pressure resistance. .

[Brief explanation of drawings]

FIG. 1 is a partially omitted cross-sectional view of one embodiment of the present invention, FIG. 2 is a partial cross-sectional view of another embodiment of the present invention, and FIG. 3 is the belt-shaped body shown in FIG. 1. A partial cross-sectional view showing an engaging part in a state where it is spirally wound;
FIG. 4 is a partial cross-sectional view showing an engaging portion in a state where a conventional well-known band-shaped body is spirally wound. 1... Band-shaped body, 2... Base, 3... Engagement rib,
4...Socket, 5,5a...Upright rib, 6...
Diagonal rib, 7, 7a... Reinforcement rib.

Claims (1)

[Scope of utility model registration request] The base has a longitudinal engagement rib on one end edge in the longitudinal direction, and a longitudinal socket for receiving the engagement rib on the other end edge, and the engagement rib and the socket are connected to each other. a longitudinal upright rib standing upright from the base in between; the engaging rib and the socket overlap and are wound in a helical manner so as to engage with each other to form a helical tube; 1. A belt-shaped body for forming a spiral tube, characterized in that the belt-shaped body is provided with reinforcing ribs extending integrally from the socket in the longitudinal direction and hooked onto upright ribs adjacent to the socket.