JP3090447B1 - How to connect FEP pipe - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To connect an FEP pipe to a pipe mounting hole, there has been a method using a bell mouth or a connecting short pipe, but an adhesive is indispensable for any of them, which causes a waiting time and complicated work. And problems such as uneven work. SOLUTION: A FEP pipe 7 is connected to a pipe by a flat flanged bell mouth 5 having a fastening member 3 having a waterproof layer 4 adhered to an end 3b and a wide flat flange 5b having a packing 6 adhered to the back surface. Provided is a method of connecting an FEP tube that is connected and fixed to the mounting hole 2 without using an adhesive. [Effect] An excellent water-stopping effect is obtained by the water-stopping layer, and since no adhesive is used, there is no waiting time and the work efficiency is good. The work process is simple and reliable, does not require skill, and does not cause uneven work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bell-shaped mouthpiece having a flat flange and a fastening member having a water-stop layer adhered to an end thereof, without using an adhesive and having excellent water-stop performance. FEP pipe (Flexible Electric Pipe ・
Corrugated hard polyethylene tube. The present invention relates to a method of connecting an FEP pipe for connecting and fixing an FEP pipe to a pipe through hole.

[0002]

2. Description of the Related Art Conventionally, in order to connect and fix an FEP pipe to a pipe through-hole, a FEP pipe is inserted into a pipe through-hole formed in a plate-like support such as a cable handhole, a mounting plate, or a wall.
After the pipe is inserted, a tubular member (see FIGS. 3c and 3d) having a flute-shaped opening called a bell mouth at the tip of the FEP pipe from the inside of the pipe through hole is formed into a spiral shape of the pipe body of the FEP pipe. A method of screwing it in and using a bonding material to fix it in the through hole for piping, or manufacturing a short connecting pipe for FEP pipes, gluing the connecting short pipe to the through hole for piping in advance, and further connecting the short connecting pipe method for bonding a FEP tube to the tube (JP fairness 4-23485, JP-a 7-259110) have been made.

[0003] Further, the present applicant has combined a bell mouth with a newly developed tightening member, and the bell mouth method, which had previously required skill in the work, can be easily inserted into the through hole for piping without skill. FEP for connecting and fixing FEP pipe
A pipe connection method has been filed (Japanese Patent Application No. 10-2410).
93).

FIG. 7 shows the connection method (Japanese Patent Application No. 10-241).
093). A fastening member 3 is inserted into a through hole 2 for piping formed in a plate-shaped support body
An FE screwed with a projection 3d protruding from the inside of the tube wall of the fastening member 3 using the spiral shape of the tube of the tube 7
The bell mouth 8 is inserted from the inside of the pipe through hole 2 through the P pipe 7, and the bell mouth 8 is projected from the inside of the pipe wall of the bell mouth 8 using the spiral shape of the pipe body of the FEP pipe 7. Then, the FEP pipe 7, the fastening member 3, and the bell mouth 8 are bonded and fixed to the pipe through hole 2 with a waterproof adhesive 9.

Reference numeral 3a denotes a main body of the tightening member 3, 3b denotes an end of the tightening member 3 in which the tightening member 3 is in close contact with the outer peripheral portion of the piping through hole 2, and 3c denotes a tightening member 3. Are provided on the outer side of the tube wall, and the tightening projections for rotating the tightening member 3 with this. Reference numeral 8a denotes a main body of the bell mouth 8, and 8b denotes a tracheal opening.

[0006]

Of the above methods, the method using only a bell mouth lacks stability in the construction result, requires skill in the work, and requires a long time until the adhesive is solidified. . And, in the case of rainy weather and high water level sites, if backfilling of earth and sand is performed before the adhesive is completely solidified, so-called water (mizumichi) is generated on the bonding surface, and soil water from this water is generated. There was fear that this would lead to water leakage.

[0007] Next, the method of using the connecting short pipe for the FEP pipe is made-to-order, which causes a time constraint and an increase in cost. Further, a new method of connecting the FEP pipe and the connecting short pipe using a connecting member is required. Work occurs, which leads to further cost increase. In addition, since this method also uses an adhesive, it is inevitable to wait for the adhesive to solidify as in the method using a bell mouth, and if backfilling is performed before the adhesive solidifies, water leakage will occur. I was scared.

[0008] Japanese Patent Application No. 10-24109 filed by the present applicant
Method 3 is a significant improvement over the conventional bellmouth method, without the use of connecting short pipes, which complicates the construction method, and without the need for skill as with the conventional bellmouth method. The FEP pipe can be connected to the pipe through hole. Although this method brings great merits and has spread widely, however, since an adhesive is still used, the problem of waiting for the adhesive to solidify remains unsolved. In addition, due to the method of applying the adhesive, the work was uneven by the operator, and the construction result was somewhat lacking in stability.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the present invention is to use an adhesive which is a major disadvantage of all the conventional methods. , A fastening member with a waterproof layer made of an elastic material having both high water-stopping properties and large elasticity such as sponge-like synthetic rubber bonded to the end, and a wide flat type with a packing or water-stopping layer bonded to the back side By using a flat-type flanged bell mouth with a flange, no skill is required and the FEP can be easily and securely inserted into the piping through hole in a short time.
Provided is a method for connecting FEP pipes that can connect pipes and that maintains excellent water stoppage after construction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings according to an example of an embodiment. FIGS. 2a to 2c show a watertight layer 4 made of an elastic material such as sponge-like synthetic rubber, which has both high water-tightness and great elasticity, attached to the end 3b in one embodiment of the present invention. 1 shows a member 3 for use.

The main body 3a of the fastening member 3 is a circular pipe having an inner diameter slightly larger than the maximum outer diameter of the FEP pipe 7 (see FIG. 1). A portion in contact with the layer 4 forms a thick end portion 3b, and an FEP tube 7 made of an elastic material having both high waterproofness and large elasticity such as sponge-like synthetic rubber is provided on the front surface of the end portion 3b. The water blocking layer 4 having the center hole 4a having an inner diameter smaller than the minimum inner diameter of the above is adhered. A projection 3d is formed on the inside of the tube wall of the main body 3a so as to fit the helical shape of the tube of the FEP tube 7. On the outside of the tube wall, a fastening member 3 for rotating the entire fastening member 3 is provided. The projection 3c is provided in a protruding manner.

FIGS. 3A and 3B show a bell mouth 5 with a flat flange according to an embodiment of the present invention. The main body 5a of the flat flanged bell mouth 5 is a circular pipe having an outer diameter slightly smaller than the minimum inner diameter of the FEP pipe 7 (see FIG. 1). It becomes a wide flat flange 5b, and a packing 6 is adhered to the back surface. On the outside of the tube wall, a helical convex portion 5c that fits the helical shape of the tube of the FEP tube 7 is provided in a protruding manner.

FIGS. 3C and 3D show a conventional bell mouth 8 for comparison. The main body 8a of the conventional bell mouth 8 is a circular tube having an outer diameter slightly smaller than the minimum inner diameter of the FEP tube 7 (see FIG. 1), and the outside of the tube wall conforms to the spiral shape of the tube of the FEP tube 7. The place where the helical convex portion 8c protrudes is the bell mouth 5 with flat flange of the method of the present invention.
3 (a) and 3 (b), except that the shape of the opening 8b is largely different, and as is apparent from the longitudinal sectional view of FIG. Therefore, there still remains a problem in the degree of adhesion to the outer peripheral portion of the pipe through hole 2 as shown in FIG.
However, the bell mouth 5 with a flat flange used in the method of the present invention has a configuration with much better adhesion as shown in FIG.

Next, in one embodiment of the present invention, a method of connecting the pipe through hole 2 and the FEP pipe 7 using the fastening member 3 and the flat flanged bell mouth 5 will be described with reference to the drawings. This will be described in detail. In one embodiment of the present invention, first, the fastening member 3 is attached to the tip of the FEP tube 7. 4a to 4c (right side view), 5a to 5c
(Appearance perspective view) shows the method.

4A and 5A, the fastening member 3 is screwed (B direction) into the tip of the FEP tube 7 while rotating in the A direction (clockwise). When the fastening member 3 is further rotated in the direction A, the tip portion 7a of the FEP tube 7 is rotated.
Presses against the water-stop layer 4 adhered to the end 3b, and the water-stop layer 4 is expanded in the center hole 4a by the pressure, as shown in FIGS. 4b and 5b.

Further, when the tightening member 3 is continuously rotated in the direction A, as shown in FIGS.
The tip 7a of the EP tube 7 is exposed through the center hole 4a of the water blocking layer 4, and the FEP tube 7 is completely inserted into the fastening member 3. In this state, since the water-stop layer 4 is made of a material having high elasticity, the water-stop layer 4 is completely adhered to the spiral shape of the tubular body of the FEP pipe 7, and the spiral peak portion 7b covers the helical portion, and the valley portion 7c Then, it is in a state of being fitted therein (FIG. 4c). The degree of exposure of the distal end portion 7a depends on the support 1 such as a cable handhole, a mounting plate, or a wall.
It is adjusted appropriately according to the thickness of the film (see FIG. 1).

Next, the distal end 7a of the FEP pipe 7 having the fastening member 3 attached to the distal end is inserted into the piping through hole 2 formed in the support 1 as shown in FIG. 6A (direction C). At this stage, the tip portion 7a of the FEP pipe 7 is viewed inside the pipe through hole 2, so that the bell mouth 5 with the flat flange is rotated clockwise at the tip portion 7a as shown in FIG. 6b. Screw it in (D direction). FIG. 6c shows the state in which the screwing is completed.

Next, as shown in FIG. 6d, when the tightening member 3 is rotated counterclockwise, the tightening member 3 advances in the direction E, the water-stopping layer 4 is compressed, and the pipe at the distal end portion 7a is compressed. More strongly to the spiral shape. Further, the water blocking layer 4 is also compressed between the end 3b and the outer periphery of the pipe through hole 2.
In this state, when the tightening member 3 is tightened to the limit due to the human power of the operator, the FEP pipe 7 is completely fixed to the pipe through hole 2, and the connection is completed.

FIG. 1 is a longitudinal sectional view showing a state in which the connection is completed. In FIG. 1, the water blocking layer 4 is fitted in a strongly compressed state in the gap between the three members on the outer peripheral portion of the FEP pipe 7, the fastening member 3, and the piping through hole 2. The water-stopping layer 4 is made of a material having high water-stopping properties such as sponge-like synthetic rubber, and completely blocks the voids serving as the passage of soil moisture in a strongly compressed state. A much higher water stoppage can be obtained. Further, the waterproofness is further enhanced by the waterproof waterproof packing 6 adhered to the back surface of the flat flange 5b of the bell mouth 5 with the flat flange.

In the above, the connecting method of the FEP tube of the present invention has been described in detail according to one embodiment. In the present embodiment (see FIG. 1), the support 1 in which the pipe through-hole 2 is drilled specifically refers to the cable handhole or the mounting plate attached to the cable handhole as described above. Alternatively, it refers to a wall of a building or the like. As described above, the method of the present invention comprises a waterproof layer 4 adhered to the end of the fastening member.
The tip 7a of the FEP tube 7 to be more exposed (see FIG. 4c)
By appropriately adjusting the length of the support 1, it can be applied to the support 1 having any thickness (see FIG. 1).
No matter what name is specifically mentioned above, all are included in the scope of the method of the present invention.

The fastening member 3 and the bell-mouth 5 with a flat flange used in the method of the present invention are shown in FIG.
As shown in FIG. 3, the convex portions 3d and 5c are provided so as to conform to the spiral shape of the tubular body of the FEP tube 7. However, the convex portions 3d and 5c are devised in their intervals and shapes, respectively. It is formed so as to conform to the helical shape of any of several types of FEP tubes currently used mainly in Japan.

In the above embodiment, as shown in FIG. 1, the water blocking layer 4 is only adhered to the end 3b of the fastening member 3, but the flat mouth of the bell mouth 5 with a flat flange is used. It is naturally possible to use a bell mouth with a flat flange to which a waterproof layer is bonded instead of the packing 6 bonded to the back surface of the mold flange 5b, and this is also included in the scope of the present invention.

In the method of the present invention (see FIGS. 1 and 6a to 6c), the pipe through-hole 2 can be formed without a commercially available diamond core. The fastening member 3 and the bell mouth 5 with a flat flange used in the method of the present invention have an end portion 3b and a flat flange which have a size suitable for a through hole 2 for piping formed by removing a commercially available diamond core. 5b are formed. Therefore, in practical use, the fastening member 3 and the flat flanged bell mouth 5 having a plurality of different sizes are manufactured in consideration of the size of the FEP tube 7 and the size of a commercially available diamond core.
In addition, it is of course possible to drill the through hole 2 for piping with a tool other than a commercially available diamond coring, or to drill the through hole for piping at the time of manufacturing the wall body, which is out of the scope of the present invention. is not.

[0024]

The first effect of the present invention is that an excellent water stopping effect can be obtained instantaneously, which cannot be obtained by the conventional methods using an adhesive. Although the sponge-like synthetic rubber is mentioned as an example of the material of the water-stop layer used in the connection method of the present invention, the water-stopping effect of the water-stop layer formed using this sponge-like synthetic rubber is really excellent, The effect has been sufficiently confirmed by a water leakage test in which a cable handhole to which an FEP pipe was connected was submerged in water using a fastening member actually using the material and the method described in detail in Examples.

The time required for drying the adhesive depends on the type of the adhesive, but it takes several hours to one day or more. During the waiting time, no work such as backfilling of earth and sand was performed at all, and the working efficiency was very poor. However, since no adhesive is used in the method of the present invention, the next operation such as backfilling of earth and sand can be started immediately, and as a result, the operation efficiency has been improved in each step. The fact that work is possible even in rainy weather is a great effect because no adhesive is used.

A second advantage of the method of the present invention is that the working process is simple and reliable, and requires no skill at all. According to the method of Japanese Patent Application No. 10-241093 by the inventor of the present application, the certainty of the method of using a bell mouth has been raised at a stretch, but there are still some "knacks" in the method of applying the adhesive, and the skill of the operator is high. Work unevenness occurred depending on the degree. However, the method of the present invention does not use an adhesive and only tightens each member in a fixed procedure, so no skill is required, anyone can easily and securely perform the connection work, and the work unevenness is completely eliminated. Was done.

As a third effect of the method of the present invention, the shape of the fastening member and the convex portion protruding from the tube wall of the bell mouth with a flat flange is devised, and it is currently mainly distributed in Japan. It can be applied to any of several types of FEP tubes. At present, several types of F
Few types of FEP tubes other than EP tubes are rarely used, and the method of the present invention can be said to be applicable to virtually any site.

A fourth effect of the method of the present invention is that a commercially available diamond core can be used for forming a through hole for piping. Conventionally, the size of the bellmouth was determined without considering this point, so when drilling a through hole for piping, there are few cores without a diamond core that are commercially available. It itself took a lot of effort. However, in the present invention, the end of the fastening member and the flat flange of the bell mouth with the flat flange are sized to fit a commercially available core without a diamond core. It has been greatly reduced, and the accuracy of the finish after drilling has also been improved.

The effects of the present invention are summarized as follows. By the action of the water blocking layer, an excellent water stopping effect can be obtained instantaneously. Since no adhesive is used, no waiting time for drying is required, and the work efficiency is very good. Work is possible even in rainy weather. The work process is simple and reliable, does not require skill, and no work unevenness occurs. Several types of FEP currently mainly distributed in Japan
A commercially available diamond coring can be used for drilling a through hole for piping that can be applied to any of the pipes.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the method of the present invention.

FIG. 2a is an external perspective view of a fastening member according to an embodiment of the method of the present invention. b is an external perspective view of a fastening member of one embodiment of the method of the present invention. c is a longitudinal sectional view of a fastening member of one embodiment of the method of the present invention.

FIG. 3a is an external perspective view of a flat flanged bell mouth according to an embodiment of the method of the present invention. b is a longitudinal sectional view of a bell mouth with a flat flange according to an embodiment of the method of the present invention. c is an external perspective view of a bell mouth as an example of a conventional method. d is a longitudinal sectional view of a bell mouth as an example of a conventional method.

FIG. 4a is a right side view of a step of attaching a fastening member to an FEP tube in one embodiment of the method of the present invention. b is a right side view of the step of mounting the fastening member on the FEP tube in one embodiment of the method of the present invention. c is a right side view of the step of mounting the fastening member on the FEP tube in one embodiment of the method of the present invention.

FIG. 5a is an external perspective view of a step of attaching a fastening member to an FEP tube in one embodiment of the method of the present invention. b is an external perspective view of a step of attaching a fastening member to the FEP tube in one embodiment of the method of the present invention. c is an external perspective view of a step of attaching a fastening member to the FEP tube in one embodiment of the method of the present invention.

FIG. 6a is a right side view in which a part of a step of connecting an FEP pipe to a piping through hole is omitted in one embodiment of the method of the present invention. b is a right side view in which a part of a step of connecting an FEP pipe to a piping through hole is omitted in one embodiment of the method of the present invention. c is a right side view in which a part of a step of connecting the FEP pipe to the piping through hole is omitted in one embodiment of the method of the present invention. d is a right side view in which a part of a step of connecting the FEP pipe to the pipe through hole is omitted in one embodiment of the method of the present invention.

FIG. 7 is a longitudinal sectional view of an example of a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support body 2 Piping through-hole 3 Tightening member 3a Main body 3b End 3c Tightening convex part 3d Convex part 4 Waterproof layer 4a Center hole 5 Flat-type bell mouth with flange 5a Main body 5b Flat flange 5c Convex part 6 Packing 7 FEP tube 7a Tip 7b Crest 7c Valley 8 Bellmouth 8a Body 8b Opening 8c Convex 9 Adhesive

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 41/00-41/16 H02G 9/00-9/12

Claims (1)

(57) [Claims] Claims: 1. An apparatus which is smaller than the minimum inner diameter of an FEP tube.
High water-blocking properties such as sponge-like synthetic rubber with a central hole of diameter
And a waterproof layer that has both great elasticity and adhered to the end
Protrusions protrude inside the pipe wall to fit the spiral shape of the FEP pipe
The tightening member is screwed into the end of the FEP tube.
When the tip of the FEP pipe presses the water-stop layer, the water-stop layer becomes
The central hole expands due to pressure and tightens as it is
If you continue to rotate the member, the water stop layer will be a spiral shape of the FEP pipe
And the spiral peak of the FEP tube
Covered, and in the valley part it will be in a state fitted in it,
Next, the tip of the FEP tube with a fastening member attached to the tip
Part is inserted into a through hole for piping formed in the support, and the FE
Waterproof packing or waterproof layer is connected to the back of the P pipe tip.
FEP tube on the outside of tube wall with wide flat flange fitted
Flat franc with a protruding part that fits the helical shape of the tubular body
Screw the bell mouth with a zipper and further tighten the tightening member
The FEP pipe is completely fixed in the through hole for piping.
A method of connecting an FEP pipe, characterized in that the FEP pipe is fixed to a pipe through-hole without using an adhesive, while still having excellent water stopping properties.