JPH0117031B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conduit for being pushed into a tube from one end to transfer fluid.

A typical prior art is disclosed in Japanese Utility Model Application No. 48-31613, which is shown in FIG. An elastic band 72 is attached to one side of the hose main body 71, and important points are connected to each other by appropriate fasteners 73. The elastic body 2 has an arcuate cross-sectional shape, as is known from, for example, a tape measure made of a steel plate.

In such prior art conduits 70, elastic bands 7
Although it is relatively easy to curve the portion 74 on the opposite side to the elastic band 72 inward in the radial direction, it is difficult to curve the portion 75 on the side of the elastic band 72 inward in the radial direction. In particular, when the elastic band 72 is connected to the hose body 71 by the fastener 73 at a small interval in the axial direction of the hose body 71, the conduit can be connected with the respective parts 74 and 75 radially inward. It is impossible to curve 70. Therefore, the conduit 70 cannot be forced into a tortuous pipe.

Instead of the fastening tool 73, for example,
The hose main body 71 and the elastic band 7 are made of tinsel alone or braided into a fabric as disclosed in No. 132020.
It may simply be possible to surround the conduit 70 along its entire circumference and length; however, in such a case, the conduit 70 would remain in a straight line, and the sections 74, 75 becomes completely impossible to curve radially inward.

An object of the present invention is to enable a flexible tube for transporting fluid to be inserted into the tube by pushing it from one end in the longitudinal direction, and to be able to insert the flexible tube freely even if the tube into which it is to be inserted is bent. It is an object of the present invention to provide a conduit for insertion into a tube which can be inserted by being pushed into the tube.

The present invention provides a flexible tube 20 for transporting fluid and having a circular cross section perpendicular to the axis;
It is attached over the entire length of the flexible tube 20, extends parallel to the axis of the flexible tube 20, is in the shape of a long flat plate, and is made of metal with elasticity. contacting the outer circumferential surface of the flexible tube 20 and having a width of 2
d is selected to have a value less than the outer diameter D20 of the flexible tube 20, and the outer circumference of the flexible tube 20 and the strip 21 attached thereto over the entire length in the axial direction. However, on the outer circumferential surface of the flexible tube 20, there are edges 21b on both sides of the other surface of the strip-shaped body 21, which are in close contact with each other over approximately half the circumference on the opposite side to the strip-shaped body 21 with respect to the axis of the flexible tube 20. ，
21c to form a space 61 between the other surface of the strip 21 and the both ends 2 of the strip 21.
A flexible cylindrical mesh 22 that forms spaces 62, 63 between the outer peripheral surface of the flexible tube 20 near the outer peripheral surface of the flexible tube 20 in the vicinity of 1b and 21c; A conduit for insertion into a pipe, which includes a flexible synthetic resin coating layer 23 surrounding the entire length of the net 22, and has a generally cylindrical overall shape. be.

FIG. 1 is an overall sectional view for explaining a construction method for improving the sealing function of a pipe joint 2 of an underground pipe 1, which is carried out in connection with an embodiment of the present invention. In the pipe fitting 2 of the pipe 1, as shown in FIG. Airtightness is maintained by Since the sealing function deteriorates due to drying of the yarn 4, the yarn 4 is swollen and the sealing function is improved by spraying or pouring a liquid such as ethylene glycol into the tube 1.

Nitrogen gas is compressed and sealed in a cylinder 8 mounted on the truck 7, and the nitrogen gas from the cylinder 8 is led to the upper part of a pressurized tank 9. A liquid such as ethylene glycol is stored in this pressurized tank 9, and the lower part of this pressurized tank 9 is connected via a conduit 10 to a conduit 12 wound around a reel 11. The ethylene glycol in the pressurized tank 9 is transferred from the conduit 10 to the conduit 1 by the pressure of nitrogen gas.
2. This conduit 12 is inserted into the hole 13 from a hole 13 formed in the side wall of the pipe 1 buried underground, using an insertion tool 14 on one side in the insertion direction of the hole 13 (in this embodiment, the left side in FIG. 1). inserted into. A nozzle 15 is attached to the tip of this conduit 12, and liquid is ejected from this nozzle 15. The liquid from the nozzle 15 flows along the bottom of the pipe 1 and is injected onto the inner wall of the pipe 1, and the liquid is stored in a water collector 16 provided in the middle of the pipe 1. Water collector 16
The liquid stored in the tube 17 is pumped up by the pump 18 and recovered. In this way, the liquid penetrates the yarns 4 of the pipe fitting 2 by capillary action and swells, thereby preventing leakage of the gas flowing through the pipe 1.

By pushing the conduit 12 through the hole 3,
A conduit 12 is inserted into the tube 1. To make this possible, the conduit 12 has the structure shown in the third figure in its cross section. The flexible tube 20 is made of synthetic resin such as nylon 66 or Teflon (trade name). Liquid is transferred into this tube 20. On the outer periphery of the tube 20, an elastic strip 21 made of a long flat plate-like hardened steel is attached parallel to the axis of the tube 20 over the entire length of the tube 20. The tube 20 and the strip 21 are surrounded by a mesh 22 over its entire circumferential circumference and over its entire axial length, and the mesh 22 is thus formed in a cylindrical shape. A coating layer 23 made of flexible synthetic resin is formed on the outer periphery of the mesh tube 22 in order to reduce friction within the tube 1 and the like. According to such a tube 12, even when the tube 1 is curved, the tube 12 can be inserted smoothly along the tube 1 by pushing the tube 12 into the hole 13. It becomes possible to be The flexible tube 20 has a circular cross section perpendicular to the axis. The strip 21 contacts the outer circumferential surface of the flexible tube 20 at a substantially central position 21a in the width direction (left-right direction in FIG. 3) of one surface (the upper surface in FIG. 3). As is clear from FIG. 3, the width 2·d of the strip 21 is selected to be less than the outer diameter D20 of the flexible tube 20. The net 22 surrounds the flexible tube 20 and the band-shaped body 21 attached thereto over the entire length in the axial direction. This mesh 22 is attached to the outer circumferential surface of the flexible tube 20 so that a band-shaped body 21
On the opposite side (upper part of FIG. 3), there is a flexible tube 20 in close contact with the flexible tube 20 over approximately half the circumference, that is, clockwise from the reference numeral 20a to the outer periphery indicated by the reference numeral 20b. A net 20 is provided. This net 2
2 is in contact with both ends 21b and 21c of the other surface (the lower surface in FIG. 3) of the strip-shaped body 21, and forms a space 61 between it and the other surface of the strip-shaped body 21. This net 22 also covers the both ends 21 of the strip 21.
A space 62,
Form 63. The covering layer 23 is made of synthetic resin, has flexibility, and surrounds the entire circumference of the net 22 in close contact with the outer peripheral surface of the net 22 over the entire length of the net 22 . The overall shape of the present conduit 12 is generally cylindrical.

Referring to FIG. 4, the nozzle 15 basically consists of:
It has a nozzle body 26 and wheels 27. The nozzle body 26 includes a small diameter portion 28, a conical portion 29 that becomes larger in diameter toward the tip, and a wheel mounting portion 30 on which a wheel 27 is mounted. A flow path 31 is formed in the small diameter portion 28 along its axial direction, and this flow path 3
1 communicates with conduit 12 by means of a fitting 32. A plurality of nozzle holes 33 are formed in the small diameter portion 28 in the radial direction.

FIG. 5 is a front view of the nozzle 15. wheel 27
are provided at intervals in the circumferential direction of the nozzle body 26, and the outer periphery of the wheel 27 projects further outward than the outer periphery of the nozzle body 26. Further, the outer periphery of the wheel 27 is connected to the wheel mounting portion 30 of the nozzle body 26.
It protrudes further toward the tip (to the left in Figure 4). The plurality of wheels 27 all have the same shape, and have a rotation axis in the tangential direction of the imaginary circle on one imaginary circle in a plane perpendicular to the axis of the nozzle body 26 . The wheel 27 is loosely fitted into a groove 34 formed in the wheel mounting portion 30, and the axle 35 into which the wheel 27 is loosely inserted is brazed to the wheel mounting portion 30 at the free end of the groove 34.

FIG. 6 is a longitudinal cross-sectional view of the insertion tool 14 for orienting and inserting the conduit 12 into the tube 1;
The figure is a sectional view of a cut portion taken along the cutting plane line - in FIG. 6. The main body 37 of the insertion tool 14 is made of rigid synthetic resin, and a linear guide hole 38 having an inner diameter larger than the outer diameter of the conduit 12 is formed in the center thereof. An exhaust hole 39 is formed in communication with the guide hole 38 midway. This exhaust hole 39
extending in the radial direction. The axis of the guide hole 38 is inclined at a predetermined angle α that is not perpendicular to the axis of the tube 1, which is a linear tube to which the insertion tool 14 is to be attached. This angle α is, for example, 45°. A base 40 is fixed to the end of the main body 37 on the side of the tube 1 to which it is to be mounted. This base 40 projects from the main body 37 in the longitudinal direction of the tube 1. This base 40 can be fastened and fixed to the tube 1 with belts 41 and 42. A recess 43 is formed in the base 40, and the recess 43 surrounds one end of the guide hole 38. An airtight member 44 is fitted into this recess 43. This airtight member 44 has an insertion hole 45 having an inner diameter equal to the outer diameter of the tube 12, and is made of an elastic airtight material such as synthetic rubber. This airtight member 44
has a protrusion 46 protruding toward the tube 1 around the insertion hole 45, and this protrusion 46 can be hermetically fitted into the hole 13 formed in the tube 1. Insertion hole 45
The axis of the guide hole 38 coincides with the axis of the guide hole 38. In the main body 37, a recess 47 is provided at the other end of the guide hole 38.
is formed, and an airtight member 48 made of an elastic airtight material such as synthetic rubber is fitted into this recess 47. An insertion hole 49 having an inner diameter equal to the outer diameter of the tube 12 is formed in this airtight member 48 . The insertion hole 49 is concentric with the guide hole 38. Note that the recesses 43 and 47 may be provided with annular protrusions 50 and 51 that protrude inward to prevent the airtight members 44 and 48 from easily coming off from the recesses 43 and 47. .

Referring to FIG. 8, one airtight member 44 may be formed into a half-split shape by a cutting portion 52 extending in the radial direction of the insertion hole 45. As shown in FIG. As a result, the insertion hole 45 is expanded in the direction in which the cut portion 52 is separated.
This makes it easier to fit the tube 12 into the tube. This cut portion 52 is not formed by a part 53 of the airtight member 44, so that the airtight member 44 is prevented from being separated into two pieces, thereby reducing the risk of loss during work. do not have.

Another airtight member 48 is formed into a half-split shape as shown in FIG. Furthermore, as another example, the eighth
Similar to the airtight member 44 described in connection with the illustration, the cut portion 54 is cut off in the middle of the airtight member 48, thereby preventing it from being separated into two parts, thereby preventing loss etc. during work. You can try to get rid of your worries.

As shown in FIG. 7, the main body 37 has a guide hole 38.
A communicating inflow hole 54 is formed in the middle of the . The inflow hole 54 extends in the radial direction of the main body 37, and a check valve 55 is attached to the outer end thereof. Check valve 5
5 has a structure that prevents gas from flowing out from the guide hole 38 and allows gas to flow into the guide hole 38 from the outside.

Referring again to FIG. 6, the airtight member 48 is attached to the main body 3.
The cap 56 screwed onto the cap 7 prevents it from coming off the recess 47. The cap 56 has an internal thread and is screwed into an external thread provided on the main body 37, and the cap 56 is detachable from the main body 37. An insertion hole 57 is formed in the cap 56, and when the cap 56 is attached to the main body 37, the insertion hole 57 is concentric with the guide hole 38.

When introducing the conduit 12 into the tube 1,
There is a risk that the gas inside may leak to the outside through the gaps between the outer periphery of the conduit 12 and the insertion holes 45 and 47 and the gap between the guide hole 38. At this time, the worker 24 may inhale such gas, which is not preferable. The gas in the guide hole 38 is diffused to the outside from the flow path 39 through the flexible tube 58, and care is taken to prevent the worker 24 from inhaling the gas from the tube 1 when breathing. Furthermore, through the check valve 55, the flow path 54
Grease may be injected into the guide hole 38 to fill the gap between the inner surface of the guide hole 38 and the outer peripheral surface of the conduit 12, thereby further maintaining airtightness.

As described above, according to the present invention, since the elastic band is placed along the flexible tube, appropriate rigidity is imparted to the flexible tube, thereby allowing the tube to be inserted smoothly. Can be done. In addition, since the flexible tube and the band-like body are surrounded by a net-like cylinder over the entire length, the flexible tube and the band-like body are in close contact with each other over the entire length, and mechanical properties such as elasticity are maintained in the longitudinal direction. The pressure is uniform, the flexible tube is protected by the mesh cylinder, and the internal pressure of the flexible tube can be increased. Particularly, according to the present invention, the flexible tube 20 has a circular cross section perpendicular to the axis, and the approximately central position 21a in the width direction of one surface of the strip 21 is in contact with the outer peripheral surface of the flexible tube 20. However, the cylindrical net 22 has flexibility, and the net 22 contacts both ends 21b and 21c of the band-shaped body 21, thereby forming spaces 61, 62, and 63. Therefore, it is easy for the conduit to bend. space 61,
62, 63 easily allow tube 20 and mesh 22 to deform during bending. Also, the band-shaped body 21
Since it is flat, this also makes it easy to curve.

Furthermore, in the present invention, the width of the strip 21 is 2·d.
is selected to be less than the outer diameter D20 of the flexible tube 20, so that the overall shape of the conduit in which the net 22 and the covering layer 23 are formed can be approximately cylindrical. This also makes it easier to push and insert the conduit into the pipe, and allows the conduit to smoothly pass through the curved interior of the pipe.

Moreover, in the present invention, the spaces 61, 62, 63
The presence of this facilitates mutual displacement of tube 20, mesh 22 and strip 21, which allows the conduit to bend in all directions. Such excellent effects of the present invention are as follows:
This is an excellent effect of the present invention that cannot be achieved with the above-mentioned prior art, and with this configuration, the flexible tube 20 can be pushed into the ground from one end, for example. This allows it to be inserted into pipes such as underground pipes.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view for explaining the work to improve the sealing function in a pipe fitting 2 that can be applied to the present invention, FIG. 2 is an enlarged cross-sectional view of the vicinity of the pipe fitting 2, and FIG. Cross-sectional view, FIG. 4 shows nozzle 15
A cross-sectional view of the nearby side view, Figure 5 shows the nozzle 15.
FIG. 6 is a longitudinal sectional view of the insertion tool 14, and FIG.
The figure is a sectional view taken from the cutting plane line - in FIG. 6, FIG. 8 is a perspective view of the airtight member 44 seen from below in FIG. 6, FIG. 9 is a perspective view of the airtight member 48, and FIG. 1 is a cross-sectional view of the prior art. 1... Pipe, 2... Pipe fitting, 4... Yarn, 11
... Reel, 12 ... Conduit, 13 ... Hole, 14 ...
...insertion tool, 15...nozzle, 20...flexible tube,
21... Band-like body, 22... Net, 26... Nozzle body, 27... Wheel, 31... Channel, 37... Main body, 38... Guide hole, 39... Exhaust hole, 40...
Base, 44, 48...Airtight member, 45, 49, 5
7...Insertion hole, 46...Protrusion, 55...Check valve,
56...cap.

Claims (1)

[Scope of Claims] 1. A flexible tube 20 that transports fluid and has a circular cross section perpendicular to the axis;
It is attached over the entire length of the flexible tube 20, extends parallel to the axis of the flexible tube 20, is in the shape of a long flat plate, and is made of metal with elasticity. contacting the outer circumferential surface of the flexible tube 20 and having a width of 2
d is selected to have a value less than the outer diameter D20 of the flexible tube 20, and the outer circumference of the flexible tube 20 and the strip 21 attached thereto over the entire length in the axial direction. However, on the outer circumferential surface of the flexible tube 20, there are edges 21b on both sides of the other surface of the strip-shaped body 21, which are in close contact with each other over approximately half the circumference on the opposite side to the strip-shaped body 21 with respect to the axis of the flexible tube 20. ，
21c to form a space 61 between the other surface of the strip 21 and the both ends 2 of the strip 21.
A flexible cylindrical mesh 22 that forms spaces 62, 63 between the outer peripheral surface of the flexible tube 20 near the outer peripheral surface of the flexible tube 20 in the vicinity of 1b and 21c; A conduit for insertion into a pipe, comprising a flexible synthetic resin covering layer 23 surrounding the entire length of the net 22, and having a generally cylindrical overall shape.