JP2007285317A - Tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube easily transportable to even a place where water is accumulated. <P>SOLUTION: A buoyancy layer 2 with a smaller density than water is cylindrically formed on the outer peripheral surface of a main tube body 1a. The buoyancy layer 2 comprises a styrene foam part 21 wound around the outer peripheral surface of the main tube part 1a and a steel plate 22 covering the outer peripheral surface thereof. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tubular body suitable for transportation in a pipeline in which water is accumulated.

  Conventionally, as a method of rehabilitating, for example, a cylindrical sewer pipe that has deteriorated due to aging, ground fluctuation, etc., a cylindrical rehabilitation pipe is inserted into the sewer pipe so that its axis is along the sewer pipe axis. There is known a method called pipe-in-pipe construction method that covers the degraded portion (for example, see Patent Documents 1 and 2).

According to this pipe-in-pipe construction method, for example, mortar is injected between the rehabilitation pipe inserted into the sewer pipe and the sewer pipe, and the rehabilitation pipe is fixed integrally to the sewer pipe by this mortar. Thereby, since the deteriorated part of the sewer pipe can be repaired by the rehabilitation pipe, it is possible to prevent the sewage flowing through the sewer pipe from flowing out into the ground through the deteriorated part.
Japanese Patent Laid-Open No. 2003-138887 JP 2005-54557 A

  However, since sewage usually flows through the sewer pipe, and it is difficult to completely stop this flow, there are cases where an electric transport vehicle or the like cannot be used to transport the rehabilitation pipe.

  On the other hand, carrying a rehabilitation pipe by a worker in a narrow sewage pipe with a posture of a middle waist is a heavy labor, and since the carrying distance is often long, development of a pipe body that can be carried efficiently is desired.

  Therefore, an object of the present invention is to provide a tubular body that can be easily transported even when water is accumulated.

  In order to achieve the above object, the tubular body of the present invention is characterized in that a buoyancy layer having a density lower than that of water is provided on at least a part of the outer peripheral surface of the main pipe portion.

  Here, the buoyancy layer can be formed so as to surround the outer peripheral surface of the main pipe portion in the circumferential direction. The buoyancy layer can be composed of a lightweight portion wound around the outer peripheral surface of the main pipe portion and a protective portion covering the outer peripheral surface.

  Further, the lightweight portion can be formed of a foamed polystyrene material in which a plurality of grooves extending in the tube axis direction on the outer peripheral surface are formed at intervals in the circumferential direction.

  Further, detachable temporary lids for closing at least the lower part in the pipe can be provided near both ends of the main pipe part.

  Since the present invention configured as described above is provided with a buoyancy layer having a density lower than that of water on the outer peripheral surface of the main pipe portion of the pipe body, by immersing the portion where the buoyancy layer is provided in water, Even in a narrow existing pipe where water has accumulated, the pipe body can be easily transported.

  Also, if a buoyancy layer is formed so as to surround the outer peripheral surface of the main pipe portion in the circumferential direction, the buoyancy will not change even if the tube rotates during transportation, and it can be transported stably. it can.

  Furthermore, by surrounding the main pipe part with the buoyancy layer, the outer peripheral surface of the main pipe part is not damaged due to contact during transportation.

  Further, by dividing the function of the buoyancy layer as a multilayer structure of the lightweight part and the protective part, the buoyancy can be easily adjusted only by changing the lightweight part.

  Furthermore, it can wind around a main pipe part easily by using the polystyrene foam material which provided the some groove part in the outer peripheral surface as a lightweight part.

  In addition, by providing temporary lids near both ends of the main pipe portion, water can be prevented from entering the pipe, and the buoyancy can be significantly increased.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  Drawing 1 is a figure showing the schematic structure explaining the transportation method of tube 1 of this embodiment.

  First, in terms of configuration, the pipe body 1 is used as a sewer pipe or the like in which a receiving portion 1b is formed at one end of a main pipe portion 1a and an insertion portion 1c is formed at the other end as shown in FIG. It is a cylindrical object.

  The main pipe portion 1a is a tube having a constant cross section in the pipe axis direction, and the tip of the insertion portion 1c is tapered from the main pipe portion 1a as shown in FIGS. .

  The receiving portion 1b is formed by fixing a short cylindrical receiving portion 1b having an inner diameter larger than the outer diameter of the main portion 1a at the tip of the main portion 1a. The main portion 1a and the receiving portion A buffer rubber (not shown) made of an annular rubber or the like is interposed between 1b and 1b.

  For example, a fiber reinforced plastic mortar (FRPM) pipe can be used for the pipe body 1.

  The tubular body 1 composed of this FRPM tube is formed by integrating a resin mortar layer between an inner surface FRP layer and an outer surface FRP layer which are two fiber reinforced plastic (FRP) layers.

  The inner surface FRP layer and the outer surface FRP layer are formed by laminating a plurality of glass fiber layers whose fiber directions are in the circumferential direction or the tube axis direction and impregnating with unsaturated polyester.

  The resin mortar layer is made of an inorganic material such as cinnabar and an unsaturated polyester resin, and is integrated with the inner surface FRP layer and the outer surface FRP layer.

  Then, a buffer rubber is fixed to the end portion of the main pipe portion 1a made of such an FRPM pipe on the side of the receiving portion 1b with an adhesive, and the receiving portion 1b made of an FRP pipe is fitted thereon and fixed with an adhesive. To do.

  Further, although not shown, an annular water-stopping rubber is attached to the inner peripheral surface of the receiving port 1b, and this water-stopping rubber closes the space between the receiving port 1b and the insertion port 1c. It has a structure that ensures water tightness.

  As shown in FIG. 1, the outer peripheral surface of the main pipe portion 1 a of the pipe body 1 configured as described above is formed by a buoyancy layer 2 mainly composed of a foamed polystyrene portion 21 as a lightweight portion and a steel plate 22 as a protective portion. It is surrounded.

  This foamed polystyrene part 21 is formed by extending grooves 21a,... By extending a plurality of cuts in parallel at substantially the same interval on one surface of a plate-like foamed polystyrene material.

  As shown in FIG. 2, the groove portions 21a,... Are formed on the outer peripheral surface when the foamed polystyrene portion 21 is wound around the main pipe portion 1a, and the groove portions 21a,. It is placed and extended toward the pipe axis direction.

  Further, the groove portions 21a,... Can be appropriately opened when the expanded polystyrene portion 21 is wound around the outer peripheral surface of the main pipe portion 1a so as to follow the outer shape of the main pipe portion 1a.

  Moreover, what is necessary is just to set the thickness of the polystyrene part 21 suitably according to the magnitude | size of the desired buoyancy.

  Then, after the expanded polystyrene portion 21 is wound around the tubular body 1 as shown in FIG. 3A, the steel plate 22 is wound so as to cover the outer peripheral surface of the expanded polystyrene portion 21 as shown in FIG.

  The steel plate 22 is made of a flexible material having a thickness of, for example, about 1 mm, and is formed into a cylindrical shape to fasten the foamed polystyrene portion 21 and, at the same time, rivets 23,. . Thus, if it is the structure which clamps the outer periphery of the expanded polystyrene part 21 with the steel plate 22, even if the expanded polystyrene part 21 is not adhere | attached on the outer peripheral surface of the main pipe part 1a, the buoyancy layer 2 will not fall out from the tubular body 1. FIG.

  Moreover, in the inside of the pipe body 1, the temporary lid | covers 3 and 3 are arrange | positioned in two places spaced apart in the pipe-axis direction, and the space which water does not permeate is formed. FIG. 1 shows a configuration in which temporary lids 3 and 3 are attached near both ends in the tube axis direction of the main pipe portion 1a.

  As shown in FIG. 4 which is a sectional view in the direction of the AA line in FIG. 1, the temporary lid 3 is a meniscus-shaped detachable lid member that cuts off to a height of about 2/3 from the tube bottom. For example, although not shown in the figure, a structure in which a tension support material is connected to the back surface of the temporary cover 3 and the tension support material is stretched on the inner surface of the tube 1 to install the temporary cover 3 and can be removed by shrinking the tension support material. It can be.

  Next, the conveyance method of the pipe body 1 of this Embodiment and the pipe line constructed | assembled by connecting the conveyed pipe body 1 are demonstrated.

  The existing pipe 4 for transporting the pipe body 1 in the pipe is a concrete pipe line that has begun to deteriorate over time after laying, and as shown in FIG. There is a water surface S.

  In this way, the pipe body 1 with the buoyancy layer 2 and the temporary lids 3 and 3 attached thereto is carried into the pipe where water is retained, and the pipe body 1 is transported along the existing pipe 4 while floating on the water surface S. To do.

  Thus, if it is in the state which floated in the existing pipe 4, the worker who carries does not need to support the pipe 1 and can carry the pipe 1 easily only by pushing out in the desired direction.

  The right side of FIG. 1 shows a tube 1 that has been previously transported and installed at a predetermined position. The insertion portion 1c of the tube 1 that has been newly transported to the receiving portion 1b of the tube 1 is shown. Insert and join.

  1 and 5 are provided on the upper surface of the pipe body 1 that has been previously installed, and the upper surface of the existing pipe 4 when the pipe body 1 is lifted to a predetermined height or more. It is designed not to approach the side.

  The anti-lifting tool 5 includes an arc-shaped contact plate 5a formed in accordance with the outer shape of the tubular body 1, and a plurality of bolts 5b provided on the contact plate 5a at intervals in the circumferential direction. ... and nuts 5c, ... screwed to the ends of the bolts 5b, ....

  And this abutment plate 5a is placed on the upper surface of the tube body 1, and the nuts 5c,... Are set so that the interval between the outer peripheral surface of the tube body 1 and the inner peripheral surface of the existing tube 4 is set to a desired interval. Turn to adjust the length.

  Further, injection pipes 61, 61, a confirmation pipe 62, and a drain pipe 63 as shown in FIG. 5 are extended on the upper surface side and the lower surface side of the tube body 1 in accordance with the transportation and connection of the tube body 1. .

  Thus, after carrying and connecting the pipes 1,... And forming the pipe line of the pipe 1 in the existing pipe 4, the sewage is discharged from the existing pipe 4, and air is injected by the injection pipes 61, 61. Inject a filler such as mortar 6. The two injection pipes 61 and 61 have different tip positions, and the air mortar 6 can be discharged from a plurality of locations spaced in the tube axis direction.

  When the air mortar 6 is injected from the injection pipes 61, 61, the air mortar 6 is filled so as to fall from the upper surface side to the bottom surface side of the existing pipe 4 and rise from the bottom, and remains in the existing pipe 4 with the filling. The water that has been discharged is discharged from the drain pipe 63.

  In addition, the tubular body 1 is lifted by the buoyancy caused by the filling of the air mortar 6, but the movement is restricted by the lifting prevention tool 5, so the distance between the outer peripheral surface of the tubular body 1 and the inner peripheral surface of the existing pipe 4. Can be set to a desired value.

  Then, when the air mortar 6 rises up to the upper surface of the existing pipe 4, the air mortar 6 flows backward to the confirmation pipe 62, and the air mortar 6 is sufficient between the inner peripheral surface of the existing pipe 4 and the outer peripheral surface of the tubular body 1. Can be confirmed. Although not shown, the confirmation pipe 62 may be provided at a position about half the height of the existing pipe 4 so that the filling state can be confirmed step by step.

  The filling pressure of the air mortar 6 acts on the foamed polystyrene portion 21 via the steel plate 22, but since any member is a material having a strength higher than the filling pressure, it is not damaged.

  Therefore, the outer periphery of the main pipe part 1a is laminated in the order of the polystyrene foam part 21, the steel plate 22, the air mortar 6, and the existing pipe 4.

  In the pipe body 1 of the present embodiment configured as described above, the buoyancy layer 2 having a density lower than that of water is provided on the outer peripheral surface of the main pipe portion 1a. The pipe body 1 can be easily transported even in the narrow existing pipe 4 by being immersed in the water and floating on the water surface S.

  Further, even when the tube body 1 is not completely lifted, the force necessary for transportation can be reduced by buoyancy, so that transportation is facilitated.

  Furthermore, by forming the buoyancy layer 2 in a cylindrical shape on the outer peripheral surface of the main pipe portion 1a, the buoyancy does not change even when the tube body 1 rotates around the tube axis during transportation, and the buoyancy layer 2 is stably transported. can do.

  Furthermore, by enclosing the main pipe portion 1a with the buoyancy layer 2, the outer peripheral surface of the main pipe portion 1a is not damaged even if it contacts the inner surface of the existing pipe 4 or the pipe equipment during transportation.

  In addition, by dividing the function of the buoyancy layer 2 as a multilayer structure of an inexpensive and lightweight foamed polystyrene part 21 and a high strength steel plate 22, it is possible to easily adjust the buoyancy simply by changing the thickness of the foamed polystyrene part 21. it can.

  Furthermore, if it is the foamed polystyrene part 21 which provided the some groove part 21a, ... in the outer peripheral surface, it can wind around the main pipe part 1a easily.

  Further, by disposing the temporary lids 3 and 3 near both ends of the main pipe portion 1a, water can be prevented from entering the pipe and the buoyancy can be greatly increased.

  Hereinafter, in this example, a mode different from the lightweight part tubular body 1 of the buoyancy layer described in the above embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In FIG. 6, the perspective view explaining the schematic structure of the polystyrene foam part 7 as a lightweight part of a buoyancy layer was shown.

  The expanded polystyrene part 7 has a rectangular columnar shape on a rectangular double-sided adhesive sheet 7c having one side that is substantially the same length as the main pipe part 1a and the other side that is substantially the same as the peripheral length of the main pipe part 1a. A plurality of prisms 7b,... Are attached.

  This prismatic part 7b is made of a polystyrene foam material having the same length as one side of the double-sided adhesive sheet 7c, and a plurality of prismatic parts 7b,... Having the same shape are arranged parallel to each other with gaps 7a,. It is done.

  When the lower surface of the double-sided adhesive sheet 7c is wound while adhering to the outer peripheral surface of the main pipe portion 1a, the grooves 7a,... On the outer peripheral surface side are opened and can be easily wound around the main pipe portion 1a.

  If the prisms 7b,... Are connected via the double-sided adhesive sheet 7c in this way, the foamed polystyrene part 7 will not be separated even if it is excessively bent, and may be transported in a wound packing form. It becomes possible.

  Moreover, since the double-sided adhesive sheet 7c is used, the foamed polystyrene portion 7 can be temporarily fixed to the outer peripheral surface of the main pipe portion 1a before providing the protective layer, and the workability is good.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment or example, and the design does not depart from the gist of the present invention. Such modifications are included in the present invention.

  For example, in the above embodiment, a cylindrical FRPM pipe is used as the pipe body 1, but the present invention is not limited to this, and any material and any shape pipe body such as an FRP pipe, a steel pipe, or a concrete pipe may be used. It can be applied even if it exists.

  Moreover, although the said embodiment demonstrated the case where the pipe body 1 was conveyed in the existing pipe 4 made from concrete shape | molded by the cylinder shape, it is not limited to this, The cross-sectional U character by which the upper surface was open | released The pipe body 1 of the present invention can also be used when transporting in a mold waterway or lake.

  Further, in the above embodiment, the temporary lids 3 and 3 are disposed in the vicinity of both ends of the main pipe portion 1a. However, the present invention is not limited to this, and the main body 1a is floated in a state where water is immersed in the tube body 1. Also good. Thus, the direction without the temporary lids 3 and 3 may reduce the resistance to propulsion and may facilitate transportation.

  Moreover, in the said embodiment, although the cylindrical buoyancy layer 2 which surrounds the perimeter of the main pipe part 1a was provided, it is not limited to this, The pipe body 1 which may be submerged under the water surface S A semi-cylindrical buoyancy layer having a circular arc shape in cross section may be provided only at the lower part of the plate.

  Moreover, although the lightweight part was formed with the expanded polystyrene material in the said embodiment and Example, it is not limited to this, It has the intensity | strength of the grade which is not destroyed by the filling pressure of fillers, such as air mortar 6, such as a urethane farm. Any light material with a relatively small density may be used.

  Furthermore, although the steel plate 22 was used as a protection part, it is not limited to this, An aluminum plate, a plastic plate, etc. can be used.

It is explanatory drawing explaining the condition which conveys the tubular body of the best embodiment of this invention. It is a perspective view explaining the condition where a polystyrene foam part is wound around a pipe. (A) is a side view of a tubular body in which a foamed polystyrene portion is wound around the outer peripheral surface of the main pipe portion, and (b) is a side view of a tubular body in which a steel plate is wound around the outer peripheral surface of the expanded polystyrene portion. It is sectional drawing of the AA line direction of FIG. It is sectional drawing which showed the structure of the pipe line which has arrange | positioned the pipe body inside the existing pipe and filled the air mortar around it. It is a perspective view explaining the structure of the polystyrene foam part of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tube 1a Main pipe part 2 Buoyancy layer 21 Styrofoam part (light weight part)
21a Groove part 22 Steel plate (protection part)
3 Temporary lid 7 Styrofoam part (lightweight part)
7a Groove

Claims (5)

  A tubular body characterized in that a buoyancy layer having a density lower than that of water is provided on at least a part of an outer peripheral surface of a main pipe portion.   The tubular body according to claim 1, wherein the buoyancy layer is formed so as to surround an outer peripheral surface of a main pipe portion in a circumferential direction.   The tubular body according to claim 2, wherein the buoyancy layer includes a lightweight part wound around an outer peripheral surface of a main pipe part and a protective part covering the outer peripheral surface.   4. The tubular body according to claim 3, wherein the lightweight portion is a foamed polystyrene material in which a plurality of grooves extending in the tube axis direction are formed on the outer peripheral surface at intervals in the circumferential direction. The tubular body according to any one of claims 1 to 4, wherein a detachable temporary lid for closing at least a lower portion of the inside of the pipe is provided near both ends of the main pipe part. .

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