JP4625211B2 - Water leakage prevention device for telescopic tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for preventing leakage of water due to breakage of an expansion tube or the like due to an earthquake or the like, which is attached to the outer peripheral portion of an expansion tube or an expansion joint provided at an end of a water pipe bridge, an extension tube or the like. is there.
[0002]
[Prior art]
Water pipe bridges and supporting pipes are supported by bridging the water pipes on both sides of the river like road bridges, and the tensile and pushing forces associated with the expansion and contraction of pipes due to temperature changes and substructure displacement due to earthquakes, etc. In order to absorb bending and bending, an expansion tube and an expansion tube joint are often provided so that the structure can expand and contract. In recent years, we have experienced disasters due to the Great Hanshin Earthquake, etc., so the design standards for water pipe bridges have also been reviewed, and design standards have been adopted that can prevent lifeline disconnection due to falling bridges or leaks even if a major earthquake occurs. It became so.
[0003]
According to the above new design standards, a drop prevention device that takes into account the displacement of the upper and lower works of the water pipe bridge is installed, and an expansion pipe or expansion pipe joint ("expansion pipe etc.") that can follow the displacement allowed by the fall bridge prevention device However, a large degree of expansion and contraction and a high degree of followability to a displacement in a right angle direction are necessary, resulting in problems such as an increase in inter-surface dimensions and an increase in cost.
[0004]
[Problems to be solved by the invention]
On the other hand, if there is a device that can maintain the water flow function without leakage even if the expansion tube is removed or damaged while using an inexpensive expansion tube, safety is expected in the event of an unexpected disaster. Therefore, it is thought that it can contribute to lowering the price and improving safety of the water bridge. Then, this invention makes it a subject to provide the cheap apparatus which can maintain a water flow function at the time of disaster occurrence in the existing water pipe bridge and a new water pipe bridge.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following configuration. That is, the water leakage prevention device according to the present invention is a device that is attached to a water pipe so as to cover an outer peripheral portion of an expansion tube or the like provided in a water pipe bridge, and prevents water leakage due to detachment damage of the expansion tube or the like. And covering the outer peripheral portion of the installation portion such as the expansion tube with a flexible cylindrical watertight cover having elasticity, and water pipes on both sides of the installation portion such as the expansion tube. It is characterized by being fixed to.
[0006]
This water leakage prevention device is attached so as to cover an installation portion such as an expansion tube of a water pipe bridge so that the expansion tube or the like is accommodated inside a flexible cylindrical cover having elasticity and water tightness. If this leakage prevention device is provided, even if the expansion tube or the like is removed or damaged due to an external force such as a large earthquake, the installation portion of the expansion tube or the like is covered with a flexible watertight cover. It is prevented and the water flow function is maintained. In addition, in order to reinforce the flexible watertight cover and prevent the falling bridge, a strong outer cover for reinforcement is provided outside the watertight cover, and the drained water pipe is held by the outer cover.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described. FIG. 1 shows an example of a water leakage prevention device of the present invention. This water leakage prevention device 1 includes a cylindrical watertight cover 2 and a fixture 3 for fixing both ends of the watertight cover 2 to a water pipe. It has. An expansion tube S is provided at the junction of the water pipes P, P in the water tube bridge, and can be expanded and contracted by a predetermined amount. The water leakage prevention device 1 is attached so as to cover the expansion tube S of the joint portion (extraction tube installation portion) of the water pipe.
[0008]
As the expansion tube S, various types have been conventionally known, but the one shown in the drawing represents one example, and a tubular body 100 having a slightly larger diameter than the water pipe is provided on the outer peripheral portion of the joint portion of the water pipe P. And the sealing material 101 is fixed by a ring-shaped fixing member 103 (an expansion tube having another structure may be used). The expansion tube S is normally fixed to the water pipes P and P (abutted apart by the expansion and contraction t), but a large external force is caused by expansion and contraction of the tube due to temperature changes, earthquakes, etc. When this occurs, slip occurs between the sealing material 101 and the fixing member 103 and the outer peripheral surface of the water pipe P, so that the water pipe can be expanded and contracted.
[0009]
The watertight cover 2 is made of a flexible watertight rubber having elasticity, and both ends are fixed to the water pipe by ring-shaped fixtures 3. The fixing tool 3 includes a fixing ring 5 having a substantially H-shaped cross section that is fixed to the outer peripheral portion of the water pipe P, and a fastening tool (a band in the illustrated example, which is fastened to the fixing ring from the outside of the fixing ring. (It may be) 7. As shown in FIG. 2, the fixing ring is a ring having a split structure. The fixing plates 6 and 6 provided at the ends of the semicircular members 5a and 5a are fastened and fixed by bolts 8 and so on. It has become. In addition, the water stop band 7 which is a fastening tool is made of a band such as high strength fiber impregnated with resin, and is wound around the watertight cover 2 and fixed.
[0010]
Protrusions 5c, 5c are provided on the inner peripheral surface of the fixing ring 5, and an adhesive 12a is filled between the fixing ring 5 and the water pipe P. Further, both sides of the filling layer of the adhesive 12a are pressed by putty-like adhesives 12b and 12b. Further, a rubber ring 20 as a buffer material is provided on the outside of the fixing ring 5, that is, at a position opposite to the installation portion of the telescopic tube so as to be in close contact with the fixing ring. The buffer rubber ring 20 is affixed to the fixing ring 5, and has an outer diameter smaller than the inner diameter of the fastening ring 7 constituting the fixture 3, and a thickness opposite to the fixing ring 5 is the fastening ring 5. 7 is formed so as to protrude outward from the outer end face of 7.
[0011]
An outer cover 14 is provided outside the watertight cover 2. Both end portions of the outer cover 14 are fixed to the outer peripheral surface of the water pipe P by stop rings 15. FIG. 4 is a development view of the outer cover 14. The outer cover 14 has end sheets 14b and 14b attached to both front and rear ends of the sheet body 14a, and the end sheet has a plurality of cuts 14c, ... is included. Moreover, the cylindrical part 14d is each formed in the front-end | tip part of the part divided | segmented by the cut 14c of the edge part sheet | seat 14b. The cylindrical portion 14d is formed by sewing a folded sheet at the tip of the end sheet.
[0012]
In the example shown in FIG. 4, a plurality of sets of hook members 16 and ring members 17 engaged with the hook members are fixed to the side edge of the sheet main body 14a. The outer cover 14 is formed into a cylindrical shape by winding the sheet body 14a into a cylindrical shape and engaging the hook members 16,. As a method of connecting and firmly fixing the side edges of the sheet body 14a wound in a cylindrical shape, for example, a method using a fastener or a hook member 16 as shown in FIG. A method in which only the ring members 17 are provided on both sides without being provided and tightened so that high-strength strings and ropes are alternately passed through the rows of the ring-shaped members, and as shown in FIG. Other suitable methods such as a method of attaching annular bodies 18 made of cloth or the like to both side edges and sewing them with a string 19 can be adopted. Further, the end sheet at both front and rear ends of the outer cover 14 formed in a cylindrical shape is bent, and the stop ring 15 is inserted into and fixed to the cylindrical portions 14d formed at the front end portion thereof, thereby The cover 14 is fixed on the outer peripheral surface of the water pipe P. A space D is provided between the buffering rubber ring 20 and the inner surface of the end of the outer cover 14.
[0013]
Among the double-structured covers, the inner watertight cover 2 is made of a flexible rubber sheet having elasticity in all directions, but the outer cover 14 holds the water pipe when the expansion pipe or the like is detached. Therefore, it is necessary to be flexible to some extent and have a considerable strength. For this reason, it is preferable that the outer cover 14 is made of high-strength fibers. As an example of the material, it is conceivable to use aromatic polyaramid fibers (Kevlar or the like) having high strength.
[0014]
The water leakage prevention device 1 is attached so as to cover the outside of an expansion tube or the like provided at a joint portion of a water pipe of a water pipe bridge. In such a water pipe bridge, when an earthquake occurs, a pulling-out force or a pushing force acts on the joint portion of the water pipe. When the magnitude of this external force is within a certain range, it is absorbed by the slip between the water pipe and the expansion pipe, but when a strong pulling force is applied, the water pipe will be removed from the expansion pipe. Become.
[0015]
FIG. 11 schematically shows a state in which the water leakage prevention device 1 of the present invention is installed on a water pipe bridge, and FIG. 12 shows a state in which pipe removal has occurred due to an earthquake or the like. As shown in FIG. 12, even when the water pipe P is detached from the expansion / contraction pipe S due to a large pulling force due to an earthquake or the like, the stretchable watertight cover 2 extends to keep the joint of the water pipe watertight. Water leakage is prevented. Although not shown in FIG. 12, in the apparatus of the above-described embodiment, an outer cover 14 having a higher strength is provided outside the watertight cover 2 made of watertight rubber. 3 is engaged with the buffer material (rubber ring) 20, so that the detached water pipe is supported by the outer cover 14 and is prevented from being damaged by an excessive force acting on the watertight cover 2. . Even when the water pipe suddenly detaches, it engages with the fixture 3 via the cushioning material (rubber ring) 20, so that there is little impact and no excessive force is applied to the outer cover.
[0016]
Next, FIG. 9 and FIG. 10 show an embodiment different from the above, and in the water leakage preventing apparatus 1 ′ in this embodiment, the fixture 3 is a hollow, square-shaped section fixed to the outer periphery of the water pipe P. The fixing ring 55 and a tightening ring (which may be a band) 57 that is fastened to the fixing ring from the outside of the fixing ring. FIG. 10 shows the structure of the tightening ring 57, which has a two-part structure (or three or more parts) in which two arcuate members 57a and 57a are fastened with bolts 58 and 58. FIG. The tightening ring 57 includes projecting ridges 59, 59 projecting inward and an inward flange 60, and is fixed by sandwiching the end of the watertight cover 2 between the fixing ring 55. At this time, the tightening ring 57 is tightened. Since the flexible watertight cover 2 is bent in a complicated manner by the ridges 59, 59 of the ring 57, water leakage at the fixing portion is prevented. The fixing ring 55 is fixed to the water pipe with the sealing materials 62, 62 interposed therebetween. As this fixing method, known appropriate fixing means such as welding and fixing by an adhesive can be employed.
[0017]
An outer cover 64 is further provided outside the watertight cover 2. The outer cover 64 has a larger inner diameter and a longer length than the watertight cover 2. Inward flanges 64 a and 64 a are integrally formed at both ends of the outer cover 64. The inward flange 64 a is sandwiched between the reinforcing inner ring 66 and outer ring 67.
[0018]
The inner ring 66 and the outer ring 67 are both metal rings having a diameter larger than that of the water pipe P, and the outer ring 67 has a flat plate shape, but the inner ring 66 is a cylindrical portion to which the inner surface of the outer cover 64 is in close contact. 66a is provided integrally. The inner ring 66 and the outer ring 67 are fixed to the outer cover 64 by fixing means such as bolts and rivets.
[0019]
This water leakage prevention device 1 ′ is also used by being attached so as to cover the telescopic tube S, similarly to the water leakage prevention device 1 in the embodiment. The actions and effects are almost the same as in the above embodiment. In the above description, the embodiment in which the high-strength outer covers 12 and 14 are provided in addition to the water-tight cover 2 for preventing water leakage has been described. However, when the strength of the water-tight cover 2 is high, the outer covers 12 and 14 are provided. Can be omitted. Further, the both ends of the watertight cover 2 may employ other suitable fixing methods such as fastening by fastening to a water pipe with a metal belt or the like instead of using a fixing tool as shown in the drawing as a fixing means. .
[0020]
【The invention's effect】
As described above, the water leakage prevention device according to the present invention can be installed on either a newly installed or existing water pipe bridge with a simple structure. Anything can be used as long as it can cope with temperature expansion and contraction and frequent displacement of small-scale earthquakes. Therefore, an expansion tube having an inexpensive structure can be used. For this reason, the substructure is small and the construction cost can be reduced. Further, since the watertight cover is made of a flexible material, it can cope with displacement in any direction. Since it can be installed on existing water pipe bridges without requiring large-scale construction such as welding, it is possible to further improve the earthquake resistance even for small and medium-sized water pipe bridges.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of a water leakage prevention device of the present invention.
FIG. 2 is a plan view (a) and a front view (b) of a fixing ring.
FIG. 3 is an enlarged cross-sectional view of a main part of the water leakage preventing device.
FIG. 4 is a development view of the outer cover.
FIG. 5 is a development view (a) of an outer cover different from the above, and an explanatory view (b) of a method of sewing and fixing with a string or the like.
6 is an XX arrow view (a) and an enlarged view of a Y portion in FIG. 4 (b).
7 is a view taken along the line ZZ in FIG. 4;
FIG. 8 is an enlarged view (a) of the M part and an enlarged view (b) of the N part.
FIG. 9 is a cross-sectional view showing an embodiment different from the above.
FIG. 10 is an external view of the tightening ring.
FIG. 11 is an explanatory diagram of a water pipe bridge provided with a water leakage prevention device.
FIG. 12 is an explanatory diagram in the case where a pipe removal due to an earthquake or the like occurs.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water leakage prevention apparatus 2 Watertight cover 3 Fixing tool 5 Fixing ring 7 Fastening band 14 Outer cover 14a Sheet-like cover main body 20 Buffer material 55 Fixing ring 57 Fastening ring 64 Outer cover P Water pipe S Telescopic pipe

Claims (4)

Water pipe bridge or expansion pipe provided attached pipe (S) or water pipes so as to cover the outer peripheral portion of the expansion joints attached to the (P), to prevent water leakage caused by the expansion pipe (S) or expansion joint leaving damage apparatus for, covers at a gap the outer peripheral portion of the installation section of the telescopic tube (S) or expansion joint and flexible tubular watertight cover having a stretchable (2), the watertight cover (2 ) On both sides of the expansion pipe (S) or on the pipe axis direction of the installation part of the expansion joint through the fixing ring (5) provided on the outer peripheral surface of the water pipe (P). (P) is fixed to the water pipe (P) while maintaining water tightness with the outer peripheral surface, and the water tight cover (2) causes the pipe or breakage of the expansion pipe (S) or expansion joint. The water pipe on both sides in the pipe axial direction of the installation part of the expansion pipe (S) or expansion joint By extending while maintaining the watertight between the outer peripheral surface of the P), wherein a water pipe by preventing water leakage from the gap in the watertight cover (2) to said watertight covering (2) outside (P ), Which has a function of maintaining the water passage function. Water pipe bridge or expansion pipe provided attached pipe (S) or water pipes so as to cover the outer peripheral portion of the expansion joints attached to the (P), to prevent water leakage caused by the expansion pipe (S) or expansion joint leaving damage apparatus for, covers at a gap the outer peripheral portion of the installation section of the telescopic tube (S) or expansion joint and flexible tubular watertight cover having a stretchable (2), the watertight cover (2 ) Of the water pipe (P) in a state where the water tightness between the outer pipe and the outer peripheral surface of the water pipe (P) is maintained at both ends of the expansion pipe (S) or the pipe joint axial direction of the installation portion of the expansion joint. The watertight cover (2) is formed on both sides of the expansion tube (S) or the expansion joint in the tube axis direction when the expansion tube (S) or the expansion joint is removed or damaged. by extending while maintaining the watertight between the outer peripheral surface of the water pipe (P), before It has a function of maintaining the water passing function of the water pipe (P) by preventing water leakage from the gap in the watertight cover (2) to said watertight covering (2) outside
On the outside of the watertight cover (2) fixed to the water pipe (P) , a high-strength outer cover (14) having a high resistance to deformation in the axial direction and circumferential direction is provided between the watertight cover (2). The outer cover (14) is provided on the expansion tube (S) or the expansion joint when the watertight cover (2) is extended when the expansion tube (S) or the expansion joint is removed. expansion pipe for water leakage prevention device you characterized in that respectively a tube axial direction on both sides of the installation unit has a function of preventing the girder to hold the water pipe.   The leak prevention device for an expansion / contraction tube according to claim 2, wherein the outer cover (14) is formed of high-strength fibers using aromatic polyaramid fibers as reinforcing fibers. The expansion pipe (S) or expansion joint on the opposite side positions of both the fixing portion of the flexible water sealing cover provided inside the outer cover (14) (2), wherein upon expansion of the watertight cover (2) The water leakage prevention device for an expansion / contraction tube according to any one of claims 2 to 3, further comprising a cushioning material (20) that abuts against an inner end of the outer cover (14).

Images