JP2005121186A - Leak preventing packing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leak preventing packing reduced in cost by using a low-cost raw material, easy to be handled, and facilitated in the work for connecting spiral pipes. <P>SOLUTION: The packing is formed from a synthetic resin with closed cell forming property as a raw material, and has a long and narrow fitting part having a trapezoidal cross section to be fitted in a groove part of the spiral pipe. The packing is formed of a packing main body provided with a flange part projected from both side edges of a bottom side of a trapezoid of the fitting part to cover an angular part of the spiral pipe and a belt-like water absorbing swelling material attached to a surface of the fitting part of the packing main body, which is to be brought in contact with the bottom surface of the groove part of the spiral pipe, and a surface of the flange part, which is to be brought in contact with the angular part of the spiral pipe. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a packing for preventing leakage of water from a connection portion by winding the connection portion of the spiral tube when a plurality of spiral tubes are connected to form a pipe line or the like.

  Conventionally, spiral pipes are structurally lightweight and flexible, so they have been used as drainage pipes and cable protection pipes for burial. Since the joint end face in the part has a complicated shape, there is a problem that if the connection part is not securely treated for water leakage, the connection part is damaged and leaks due to earth pressure, earthquake, or the like.

  Therefore, when connecting such a spiral tube, it is widely known to prevent water leakage by winding a band-shaped packing along the groove portion in the connection portion of the spiral tube and fixing its outer peripheral surface with a joint member or the like. It has been.

As this type of packing, a water-swellable material composed of a highly water-absorbing resin obtained by crosslinking and insolubilizing a water-soluble resin is integrally formed on a peripheral surface of the non-swelling member with a rubber-like non-swelling member having a trapezoidal cross section as a core. There is known a water-stop material for spiral corrugated pipes that is formed and has a structure in which a protruding portion made of the water-expandable material is formed on a side edge of the non-expandable member.
Japanese Utility Model Sho 62-133304

Furthermore, as an invention related to this type of packing material, after winding a trapezoidal cross section of the home packing around the groove of the connecting portion of the spiral tube, the foam sheet is joined from above the home packing, and water and There is known a corrugated double pipe connection water stop method in which a paste that expands and solidifies by reaction is impregnated.
Japanese Patent No. 2819482

  In the water-stopping material shown in Patent Document 1, a highly water-absorbing resin obtained by cross-linking and insolubilizing a water-soluble resin is used as the water-swellable material. This water-stopping material absorbs moisture and expands to fill the gap between the spiral pipe and the joint member, so that the water-stopping material stops water. The problem is that a resin is required and the manufacturing cost is high.

  Moreover, since the highly water-absorbent resin has good water absorption, it must be kept in a state where water and moisture are cut off until it is used.

  On the other hand, in the water stop method shown in Patent Document 2, a foam sheet is bonded onto a home packing wound around a groove portion of a spiral tube, and the foam sheet is impregnated with a paste that reacts with water and expands and solidifies. Therefore, there are many work steps, and impregnating the foam sheet wound around the spiral tube with the paste is an extremely troublesome work and there is a problem that the work efficiency is not good.

  In order to solve the above-described problems related to the packing of spiral tubes that have been known in the past, the present invention aims to reduce manufacturing costs and facilitate quality control by using inexpensive and easy-to-handle materials. Therefore, the purpose is to provide a water leakage prevention packing with good working efficiency.

The water leakage prevention packing according to the present invention has, as a specific means for that purpose, a packing made of an independent foaming synthetic resin and having an elongated fitting portion having a trapezoidal cross section fitted in the groove portion of the spiral tube. And a packing body formed by projecting a flange for covering the peak portion of the spiral tube on both side edges of the trapezoidal bottom side of the fitting portion,
It is characterized by comprising a water-absorbing / expanding material adhered in a band shape on the surface of the fitting portion of the packing body that contacts the groove bottom surface of the spiral tube and the surface of the collar portion that contacts the peak portion of the spiral tube. .

  In the packing for preventing leakage of water according to the present invention, when the connecting portion of the spiral tube is fixed from the outside by the joint member, the packing is pressed by the inner surface of the joint member, and the fitting portion and the flange portion of the packing body are the water absorbing and expanding material. The connecting portion of the spiral tube is stopped by being pressed against the groove portion and the peak portion of the spiral tube through. Moreover, about the water which is going to leak from a slight clearance gap, a water absorption expansion | swelling material absorbs the water, it expand | swells, and it can prevent water leak by preventing permeation of water.

  In addition, this packing can be easily connected to the spiral tube simply by fitting the fitting portion into the groove portion of the connection portion of the spiral tube and fixing the connection portion so as to be sandwiched between the joint members. Very efficient.

  Furthermore, an independent foaming synthetic resin is used as the packing body, and a non-woven fabric made of synthetic resin fibers is used as the water-absorbing expansion material. All of these materials may be general-purpose materials. The manufacturing cost can be reduced.

  In addition, the packing has no water absorption in the packing body, and the nonwoven fabric used as the water absorbing expansion material does not change even when the moisture is absorbed. Since it returns, quality control is very easy.

  The packing of the present invention is made of a self-foaming synthetic resin, and has a long and narrow trapezoidal fitting portion fitted in the groove portion of the spiral tube, on both side edges of the trapezoidal bottom side of the fitting portion. A packing body formed by projecting a flange portion for covering the peak portion of the spiral tube, a surface in contact with the groove bottom surface of the spiral tube in the fitting portion of the packing body, and a spiral tube peak portion in the flange portion It is preferable that it is comprised from the water absorption expansion | swelling material stuck on the surface to contact | connect in strip shape.

  Next, the structure of the water leakage prevention packing according to the present invention will be described based on the embodiments shown in the drawings. FIG. 1 is an explanatory view showing a state in which the ends of the left and right spiral tubes are connected and fixed, and the spiral tubes 1a and 1b are joined so that both the crests 2 and the grooves 3 are in a continuous spiral shape, A packing 5 is wound around the groove portion 3 of the connecting portion 4 and the outer periphery of the connecting portion 4 is fixed by a joint member 6.

  As shown in FIGS. 2 and 3, the packing 5 wound around the groove portion 3 of the connection portion 4 includes a packing body 7 and a water-absorbing and expanding material 8 attached to the packing body 7.

  The packing body 7 has a trapezoidal cross-sectional shape that is fitted in the groove 3 of the spiral tube 1 and both sides of the trapezoidal bottom side of the trapezoid so as to cover the mountain portion 2 of the spiral tube 1. It has the collar part 10 protrudingly formed by the edge.

  The packing body 7 is preferably made of an independent foaming synthetic resin having elasticity made of polyethylene or polyurethane, and the width of the fitting portion 9 is slightly larger than the width of the groove portion 3 of the spiral tube 1. Then, by fitting the fitting portion 9 against the groove portion 3, the packing 5 is packed in a compressed state in the groove portion 3 by the elastic action of the packing body 7 so as to be firmly held. It has become.

  Further, the water absorbent expansion material 8 is a non-woven fabric provided with water absorbability and water retention formed by forming acrylic resin fibers into a thin plate shape, and the groove 3 of the spiral tube 1 in the fitting portion 9 of the packing body 7. The water-absorbing and expanding material 8a is affixed to the surface 9a that abuts the bottom surface in a band shape, and the water-absorbing and expanding material 8b is affixed to the surface 10a that abuts the peak portion 2 of the collar portion 10 and is further packed. A water-absorbing expansion material 8 c is also attached to the end of the main body 7 in the length direction.

  On the other hand, as shown in FIGS. 1 and 4, the joint member 6 includes a pair of half-cylinder members 11a and 11b each having a half-divided cylindrical body, and the side of the divided sides of the half-cylinder members 11a and 11b. Locking pieces 12 are formed on the edge portions, and protrusions 13 for preventing slippage are formed on the inner side surfaces of the half-cylinder members 11a and 11b.

  Next, a case where a spiral tube is connected will be described with reference to FIG. The spiral tube 1 has a relatively large diameter of about 1 m to 2 m. Since the crest 2 and the groove 3 are formed in a spiral shape on the outer peripheral surface of the spiral tube 1, the crest 2 and the groove 3 at the joint end portions 14a and 14b are respectively matched and continuous. The packing 5 is fitted into the groove 3 in the connecting portion 4 where both the joining end portions 14a and 14b are joined.

  The packing 5 is prepared for a large-diameter spiral tube and is set to a length of about 1 m in consideration of manufacturing cost and ease of handling. Therefore, a plurality of packings 5 are fitted into the groove portions 3 of the connection portions 4 so that there is no gap between the packings 5 and 5.

  Thus, after the packing 5 is fitted in the groove portion 3 of the spiral tube 1, the half cylinder members 11a and 11b are mounted from both sides so as to sandwich the connection portion 4, and the locking pieces of the half cylinder members 11a and 11b are mutually engaged. The bolt 16 is inserted into the bolt insertion hole 15 opened at 12 and fixed by tightening.

  By fixing the connecting portion 4 of the spiral tube 1 in this manner, the packing 5 interposed between the spiral tube 1 and the joint member 6 is pressed against the inner peripheral surface of the joint member 6, and the packing 5 is fitted. The foaming synthetic resin having elasticity of the mounting portion 9 and the collar portion 10 is pressed against the groove portion 3 and the peak portion 2 of the spiral tube 1, respectively, and the connection portion 4 of the spiral tube 1 is stopped.

  In addition, when there is a gap between the spiral tube 1 and the packing 5, water tends to flow out from the gap, and such water is absorbed by the water-absorbing expansion material 8 attached to the packing body 7. Since the gap is filled by the expansion action, the connection portion 4 of the spiral tube 1 is completely prevented from leaking water by the action of the elasticity of the packing body 7 and the water absorption and expansion property of the water absorbent expansion material 8.

  The water leakage prevention packing according to the present invention is formed by forming the packing body from an independent foaming synthetic resin, and adhering a water absorbing expansion material to the peripheral surface of the packing main body, and as a material for the packing main body and the water absorbing expansion material. Since a widely used one is used, the manufacturing cost can be reduced.

  In addition, the nonwoven fabric used as the packing body and the water-absorbing expansion material is extremely easy to control quality because the material itself does not change due to water, and can be easily attached to the spiral tube, so that work efficiency is improved. Moreover, water leakage can be completely prevented by the elasticity of the packing body and the water-absorbing expansibility of the water-absorbing expansion material.

Explanatory drawing which shows the state which connected and fixed the spiral pipe | tube. The perspective view of the packing for water leak prevention shown in FIG. AA line sectional view shown in FIG. Explanatory explanatory drawing which shows each member in the connection fixation of a spiral tube.

Explanation of symbols

1: spiral tube,
2: Yamabe,
3: Groove,
4: Connection part,
5: Packing,
6: Fitting member,
7: Packing body
8: Water-absorbing expansion material,
9: fitting part,
10: Buttocks,
11: Half cylinder member,
12: locking piece,
13: protrusion,
14: joint end,
15: Bolt hole,
16: Bolt,

Claims (1)

This is a packing for preventing water leakage by winding around the connection part of the spiral tube, and using an independent foaming synthetic resin as a material, and a long and narrow fitting part with a trapezoidal cross section fitted in the groove part of the spiral pipe A packing body formed by projecting and forming a flange portion for covering the peak portion of the spiral tube on both side edges of the trapezoidal bottom side of the fitting portion;
It is characterized by comprising a water-absorbing and expanding material adhered in a strip shape on the surface of the fitting portion of the packing body that contacts the bottom surface of the groove portion of the spiral tube and the surface of the collar portion that contacts the peak portion of the spiral tube. Water leakage prevention packing.

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