JP2013190051A - Structure for reinforcing outer surface of existing flexible pipe, and method for reinforcing the outer surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for reinforcing an outer surface of an existing flexible pipe capable of compactly and promptly reinforcing the existing flexible pipe without a large space, and to provide a method for reinforcing the outer surface.SOLUTION: A structure for reinforcing an outer surface of an existing flexible pipe includes: a filling member 11 molded on a flat outer peripheral surface of a flexible pipe 1; a water stop rubber member 14 for stopping water by being pressed by divided pressing members 13 through end water stop rubber 12 in outer peripheries of flanges 1a; a height adjusting member 15; a pressure resistance reinforcing member layer 16 for reinforcing pressure resistance of the water stop rubber member 14; a weather resistant cover member 17 covering the outer periphery thereof, and pressed and fixed on the pressing members 13 along with at least the innermost layer 16a of the pressure resistance reinforcing member layer 16; displacement-regulating plate members 20 mounted to a plurality of circumferential parts on the outside in a tube axis direction of conduit flanges F connected through connecting/fixing bolts 18 mounted instead of connection bolts of the flanges 1a, and projecting to the radial outside; and displacement regulating rod members 21 each inserted between the plate members 20 and each having a length obtained by adding a length equivalent to permitted displacement.

Description

    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer surface reinforcing structure of an existing flexible pipe and an outer surface reinforcing method thereof, and a so-called water pipe bridge and corridor in which water pipes and various water supply pipes are provided at a portion where rivers, roads, railways, etc. intersect in a bridge form. Thus, a flexible tube for absorbing a change in temperature, an earthquake, or the like provided at the end of the pipeline is reinforced from the outer surface so that it can be used as it is.

In so-called water pipe bridges and corridors where water pipes and various water pipes are installed at the intersections of rivers, roads and railways in the form of bridges, in the middle of pipes to absorb displacement due to temperature changes and earthquakes, etc. A flexible tube is provided on the surface.
Such flexible tubes need to be replaced when they age or the amount of displacement exceeds an acceptable value. However, if an attempt is made to replace the flexible tube in service, the replacement may be avoided during the construction period due to reasons such as the need to keep the water shut off.
On the other hand, when an existing flexible tube is damaged, water leaks at once and the water is cut off. Therefore, the existing flexible tube is reinforced, and various proposals have been made.

For example, as shown in FIG. 8, a water pipe bridge is constructed by providing abutment A on both sides of a river and the like, and fixing a pipeline D to a support B provided on the abutment A via a ring support C. The flexible tube 1 is provided in the middle of the pipe D.
As a method for reinforcing such an existing flexible tube 1 without exchanging it, for example, Patent Document 1 discloses that the outer periphery of the flexible tube 1 is stretched and covered with a rubber stretchable cover 2 and a protective cover 3. A pipe leakage prevention device 4 is disclosed.
In the water leakage prevention device 4 for the expansion tube, the expansion cover 2 covers the outer periphery of the expansion tube constituting the flexible tube 1 over the entire circumference and the entire length, and both ends in the axial direction are sandwiched by the flexible tube 1. The fixing tools 5 and 5 are fixed to the pipes D and D on both sides, and the expansion cover 2 is fastened to the fixing tool 5 with the fixing band 6 so as to be fixed in a watertight manner. And the connection metal fittings 6 and 6 are attached between the fixtures 5 and 5 as a separation prevention means, and the rope 7 made of an aramid fiber is connected in a somewhat slack state. Further, a cylindrical protective cover 3 is provided so as to cover the expansion / contraction cover 2, and the expansion / contraction cover 2 is reinforced by restraining the expansion of the expansion cover 2 by the water pressure from the inside to prevent damage, and the pipe D , D is also expected to be effective in preventing falling bridges by restraining them from separating from each other.

JP 2008-232348 A

However, in such a water leakage prevention device 4 for an expansion tube, a protective cover 3 is provided on the further outer side of the expansion cover 2 that covers the outside of the flexible tube 1 to make it watertight, and the expansion cover 2 bulges outward by water pressure. Although it restrains and prevents breakage, it is necessary to cover the outer side of the flexible tube 1 with the expansion / contraction cover 2 and the protective cover 3, and a large space is required for construction. There is a problem that it becomes difficult to work in a narrow space.
In order to make the expansion / contraction cover 2 watertight, a large expansion / contraction cover 2 that can cover the outer periphery of the flexible tube 1 over the entire circumference and the entire length thereof must be prepared. After being covered, it has to be formed into a cylinder by heating and pressurizing at the site, which requires a jig for joining, and there is a problem that the time required for construction becomes long, such as taking time and labor for carrying in.

  The present invention has been made in view of the above-mentioned problems of the prior art, and does not require a large space for an existing flexible tube, and can be reinforced in a short time in a compact and flexible manner. The outer surface reinforcement method is intended to be provided.

  The outer surface reinforcing structure for an existing flexible tube according to claim 1 of the present invention that solves the above-described problems of the prior art is an outer surface of an existing flexible tube that reinforces a flexible tube attached to a pipe line via a flange from the outer surface. It is a reinforcing structure, and a filling member for forming a flat outer peripheral surface between the flanges of the flexible tube, and a side end portion covering the outer peripheral surface and both end flanges of the flexible tube made flat by the filling member. The water-stopping rubber member that is pressed by the split presser member via the end-stopping rubber installed on the outer periphery of the flange and stops the water, and the thickness of the split presser member that holds the waterstop rubber member A height adjusting member that fills the outer peripheral space by suppressing the swelling of the water-stopping rubber member, and a pressure-resistant reinforcing member layer that pressure-proofs the water-stopping rubber member so as to cover between the pressing members at both ends and the outer periphery of the height adjusting member. And cover the outer periphery of the pressure-resistant reinforcing member layer. A pipe connected to the flange via a weatherproof cover member pressed and fixed on the pressing member together with at least the innermost layer of the pressure-proof reinforcing member layer, and a connection fixing bolt attached instead of the connection bolt connecting the flange A plate member for displacement control that is attached to a plurality of circumferential directions on the outer side in the tube axis direction of the road flange and protrudes radially outward, and a length corresponding to a displacement that is inserted and allowed between the plate members is added. And a displacement regulating rod member.

  According to a second aspect of the present invention, there is provided an outer surface reinforcing structure for an existing flexible tube, in addition to the structure according to the first aspect, an end water-stopping rubber installed on the outer periphery of the flange is formed of an O-ring, and the divided presser member This is characterized in that an O-ring groove is formed on the inner peripheral side of the.

  According to a third aspect of the present invention, there is provided an outer surface reinforcing structure for an existing flexible tube, in addition to the structure according to the first or second aspect, a protrusion is provided on the outer peripheral surface of the divided pressing member, and both sides of the protrusion in the tube axis direction are provided. The pressure-resistant reinforcing member layer is formed by pressing and fixing at least the innermost layer and the weather-resistant cover member.

  According to a fourth aspect of the present invention, there is provided a method for reinforcing an outer surface of an existing flexible tube, wherein the flexible tube attached to a pipe line via a flange is reinforced from the outer surface by the outer surface reinforcing method. Between the flanges of the flexible tube is formed into a flat outer peripheral surface by a filling member, and the outer peripheral surface and both end flanges of the flexible tube made flat by the filling member are covered with a waterproof rubber member, and the side ends are joined to each other. In addition, an end water stop rubber is installed on the outer periphery of the flange and is fixed by pressing with a divided presser member, and the outer peripheral space of the water stop rubber member due to the thickness of the divided presser member is suppressed to prevent swelling of the water stop rubber member. After being filled with the height adjusting member, a pressure-resistant reinforcing member layer for pressure-proof reinforcing the water-stopping rubber member is provided to cover between the pressing members at both ends and the outer periphery of the height adjusting member, and the outer periphery of the pressure-resistant reinforcing member layer is covered. And at least the innermost layer of the pressure-resistant reinforcing member layer Displacement regulation that protrudes radially outward via connection fixing bolts installed at multiple locations in the circumferential direction instead of the connection bolts connecting the flanges, by providing a weatherproof cover member that is pressed and fixed on the presser member. The plate member is attached to the outside of the pipe flange connected to the flange in the pipe axial direction, and a displacement regulating rod member having a length corresponding to the allowable displacement is inserted between the plate members. It is characterized by doing so.

  According to a fifth aspect of the present invention, in addition to the configuration according to the fourth aspect, the outer surface reinforcing method for the existing flexible pipe is constituted by an O-ring, and is bonded to the outer periphery of the flange. At the same time, it is joined in an annular shape and is pressed by an O-ring groove formed on the inner peripheral side of the divided presser member.

  According to a sixth aspect of the present invention, in addition to the structure of the fourth or fifth aspect, the outer surface of the existing flexible pipe is provided with a protruding portion on the outer peripheral surface of the divided pressing member, and both sides of the protruding portion in the tube axis direction are provided. And at least the innermost layer of the pressure-resistant reinforcing member layer and the weather-resistant cover member are pressed and fixed.

According to the outer surface reinforcing structure of the existing flexible tube according to claim 1 of the present invention, the outer surface reinforcing structure of the existing flexible tube that reinforces the flexible tube attached to the pipe line via the flange from the outer surface, A filling member for forming between the flanges of the flexible tube into a flat outer peripheral surface, and the outer peripheral surface and both end flanges of the flexible tube made flat by the filling member are joined to form a cylindrical shape by joining the side end portions. A water-stopping rubber member that is pressed by the divided presser member through the end-stopping rubber installed on the outer periphery of the flange to stop the water, and the outer peripheral space by the thickness of the split presser member that holds the water-stopping rubber member is filled to A height adjusting member that suppresses swelling of the water rubber member, a pressure-resistant reinforcing member layer that pressure-proofs the water-stopping rubber member so as to cover between the pressing members at both ends and the outer periphery of the height adjusting member, and Less pressure-resistant reinforcing member layer covering the outer periphery A weather-resistant cover member that is pressed and fixed onto the presser member together with the innermost layer, and a pipe flange direction of a pipe flange connected to the flange via a connection fixing bolt that is attached in place of the connection bolt that connects the flange A displacement-regulating plate member attached to a plurality of locations in the outer circumferential direction and projecting radially outward; a displacement-regulating rod member having a length corresponding to a displacement that is inserted between the plate members and allowed; and Since the outer peripheral surface of the flexible tube is flattened with a filler, the water-stopping rubber member is wound and joined into a cylindrical shape, and the end of the water-stopping rubber member is joined via the end-stopping rubber. By pressing and fixing to the flange of the flexible tube with a pressing member, it is possible to ensure water tightness by being in close contact with the outer periphery of the flexible tube, and to be compact without fixing a new flange. In addition, the space around the thickness of the presser member is filled with a height adjustment member and covered with a pressure-resistant reinforcing member layer, so that the space where the water-stopping rubber member swells freely can be eliminated. By covering with the reinforcing member layer, the pressure resistance can be surely imparted. Furthermore, weather resistance can be ensured by covering the outside with a weather-resistant cover member, and between the plate members fixed with a connection fixing bolt instead of the connection bolt between the flange of the flexible tube and the pipe line flange. The allowable displacement can be regulated by the length of the rod by inserting the displacement regulating rod, and displacement absorption and breakage can be prevented.
Thereby, a flexible tube in a narrow space such as a water pipe bridge can be reinforced from the outer surface and can be continuously used as it is, and each member is also lightweight and compact, and can be reinforced easily and in a short time.

  According to the outer surface reinforcing structure of the existing flexible tube according to claim 2 of the present invention, the end water stop rubber installed on the outer periphery of the flange is formed by the O ring, and the O ring is provided on the inner peripheral side of the divided presser member. Since the groove is formed, the sealing performance by the water-stopping rubber member can be more reliably improved by the O-ring on the outer periphery of the flange and the O-ring groove of the pressing member that holds the flange.

  According to the outer surface reinforcing structure of the existing flexible pipe according to claim 3 of the present invention, the projecting portion is provided on the outer peripheral surface of the divided presser member, and at least the most of the pressure-resistant reinforcing member layer on both sides in the tube axis direction of the projecting portion. Since the inner layer and the weather resistant cover member are pressed and fixed, the innermost layer of the pressure resistant reinforcing member layer and the weather resistant cover member are pressed and fixed on both sides in the tube axis direction of the protruding portion formed on the outer peripheral surface of the pressing member. It is possible to reliably prevent the innermost layer of the layer and the weather resistant cover member from coming off, and to ensure reliable reinforcement and weather resistance.

According to the method for reinforcing the outer surface of an existing flexible tube according to claim 4 of the present invention, the method for reinforcing the outer surface of an existing flexible tube, which reinforces the flexible tube attached to the pipe line via a flange from the outer surface, is possible. Between the flanges of the flexible tube is formed into a flat outer peripheral surface by a filling member, and the outer peripheral surface and both end flanges of the flexible tube made flat by the filling member are covered with a waterproof rubber member, and the side ends are joined to each other. In addition, an end water stop rubber is installed on the outer periphery of the flange and is fixed by pressing with a divided presser member, and the outer peripheral space of the water stop rubber member due to the thickness of the divided presser member is suppressed to prevent swelling of the water stop rubber member. After being filled with the height adjusting member, a pressure-resistant reinforcing member layer for pressure-proof reinforcing the water-stopping rubber member is provided to cover between the pressing members at both ends and the outer periphery of the height adjusting member, and the outer periphery of the pressure-resistant reinforcing member layer is covered. And at least the innermost layer of the pressure-resistant reinforcing member layer Displacement regulation that protrudes radially outward via connection fixing bolts installed at multiple locations in the circumferential direction instead of the connection bolts connecting the flanges, by providing a weatherproof cover member that is pressed and fixed on the presser member. The plate member is attached to the outside of the pipe flange connected to the flange in the pipe axial direction, and a displacement regulating rod member having a length corresponding to the allowable displacement is inserted between the plate members. Since the outer peripheral surface of the flexible tube is flattened with a filler, the water-stopping rubber member is wound and joined into a cylindrical shape, and the end of the water-stopping rubber member is flexed through the end-stopping rubber. By pressing and fixing to the flange of the tube with a pressing member, it is possible to ensure water tightness by tightly contacting the outer periphery of the flexible tube, and it is possible to make it compact without fixing a new flange. In addition, the space around the thickness of the presser member is filled with a height adjustment member and covered with a pressure-resistant reinforcing member layer, so that the space where the water-stopping rubber member swells freely can be eliminated. By covering with the reinforcing member layer, the pressure resistance can be surely imparted. Furthermore, weather resistance can be ensured by covering the outside with a weather-resistant cover member, and between the plate members fixed with a connection fixing bolt instead of the connection bolt between the flange of the flexible tube and the pipe line flange. The allowable displacement can be regulated by the length of the rod by inserting the displacement regulating rod, and displacement absorption and breakage can be prevented.
Thereby, a flexible tube in a narrow space such as a water pipe bridge can be reinforced from the outer surface and can be continuously used as it is, and each member is also lightweight and compact, and can be reinforced easily and in a short time.

  According to the outer surface reinforcing method of the existing flexible tube according to claim 5 of the present invention, the end water-stopping rubber installed on the outer periphery of the flange is constituted by an O-ring, and is bonded to the outer periphery of the flange, and is joined in an annular shape. Since the O-ring groove formed on the inner circumference side of the divided presser member is pressed, the sealing performance by the water-stopping rubber member is more reliably improved by the O-ring on the outer periphery of the flange and the O-ring groove of the presser member that presses the flange. can do.

  According to the method for reinforcing the outer surface of the existing flexible tube according to claim 6 of the present invention, the projecting portion is provided on the outer peripheral surface of the divided presser member, and at least the outermost of the pressure-resistant reinforcing member layer on both sides in the tube axis direction of the projecting portion. Since the inner layer and the weather-resistant cover member are pressed and fixed, by pressing and fixing the innermost layer of the pressure-resistant reinforcing member layer and the weather-resistant cover member on both sides in the tube axis direction of the protruding portion formed on the outer peripheral surface of the pressing member, It is possible to reliably prevent the innermost layer of the pressure-resistant reinforcing member layer and the weather-resistant cover member from coming off, and to ensure reliable reinforcement and weather resistance.

It is applied to one Embodiment of the outer surface reinforcement structure of the existing flexible tube of this invention, (a) is a schematic longitudinal cross-sectional view, (b) is an expanded sectional view of B section. It is a right view concerning one Embodiment of the outer surface reinforcement structure of the existing flexible tube of this invention. According to an embodiment of the method for reinforcing the outer surface of an existing flexible tube of the present invention, (a) is a partial sectional view of a first step, (b) is a partial sectional view of a second step, and (c) is a third step. FIG. It concerns on one Embodiment of the outer surface reinforcement method of the existing flexible tube of this invention, (a) is the fragmentary sectional view of a 4th process, (b) is the fragmentary sectional view and partial cross section of a 5th process. According to an embodiment of the method for reinforcing the outer surface of an existing flexible tube of the present invention, (a) is a partial sectional view of a sixth step, (b) is a partial sectional view of a seventh step, and (c) is an eighth step. FIG. It concerns on one Embodiment of the outer surface reinforcement method of the existing flexible tube of this invention, (a) is a fragmentary sectional view of a 9th process, (b) is a fragmentary sectional view of a 10th process. The fragmentary sectional view concerning other embodiment of the outer surface reinforcement structure of the existing flexible tube of this invention, (b) is a cross-sectional view of a pressing member, respectively. It is applied to the conventional outer surface reinforcing structure of an existing flexible tube, (a) is a schematic configuration diagram of the whole, and (b) is a partially enlarged sectional view.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out an outer surface reinforcing structure of an existing flexible tube and a method for reinforcing the outer surface of the present invention will be described in detail with reference to the drawings.
As the existing flexible tube 1 to which the present invention is applied, for example, as shown in FIG. 1, the connection bolts are connected to the pipeline flanges F, F of the pipelines D, D via the flanges 1a, 1a of the flexible tube 1. 1b and a nut 1c are fastened and attached, and an expansion and contraction portion 1d such as a bellows made of an elastic body such as rubber secures a change in temperature and a displacement such as an earthquake and water-stopping property. The flexible tube is not limited to this, and may have other structures such as the telescopic tube shown in FIG.
In this existing flexible pipe outer surface reinforcing structure 10, the main structure of the outer surface reinforcing structure is installed by using flanges 1 a and 1 a at both ends of the flexible pipe 1 in a state where the existing displacement has occurred, and the pipe flange F , F is used to install a structure for restricting displacement after construction, which is more compact than the conventional structure described with reference to FIG. 8 and can be installed in a narrow space.

  As shown in FIGS. 1 and 2, the existing flexible tube outer surface reinforcing structure 10 is filled with a filling member 11 that forms a flat outer peripheral surface between the flanges 1 a and 1 a of the flexible tube 1. The outer end surface of the flexible tube 1 made flat and the flanges 1a and 1a on both ends are joined to form a cylindrical shape by joining the side end portions, and the end waterproof rubber installed on the outer periphery of the flanges 1a and 1a A sheet-like water-stopping rubber 14 is provided as a water-stopping rubber member that is pressed by the divided presser member 13 through the O-ring 12 to stop water. And the height adjustment member 15 which fills the outer peripheral space by the thickness of the split pressing member 13 which presses the water stopping rubber 14 which is the water stopping rubber member and suppresses the swelling of the water stopping rubber 14 is provided, and the pressing members at both ends are provided. A pressure-resistant reinforcing member layer 16 is provided in a laminated state, which covers the outer periphery of the height adjusting member 15 between 13 and 13 and reinforced the waterproof rubber 14 with pressure resistance. Further, a weather-resistant cover member 17 is provided that covers the outer periphery of the pressure-resistant reinforcing member layer 16 and is pressed and fixed onto the pressing member 13 together with at least the innermost layer 16a of the pressure-resistant reinforcing member layer. Further, in order to restrict the displacement, the pipe line is connected via connection fixing bolts and nuts 18 and 19 attached in place of the connection bolts and nuts 1b and 1c for connecting the flange 1a of the flexible pipe 1 and the pipe flange F. Displacement restricting plate members 20 protruding outward in the radial direction are attached to a plurality of circumferential positions on the outer side in the tube axis direction of the flanges F, F, and the length corresponding to the allowable displacement is set between the plate members 20, 20. The displacement regulating rod member 21 having the added length is inserted to form the outer surface reinforcing structure 10 of the existing flexible tube.

According to the outer surface reinforcing structure 10 of such an existing flexible tube, the outer peripheral surface of the flexible tube 1 is flattened by the filling member 11, wound with the water-stopping rubber 14 and joined into a cylindrical shape. By pressing and fixing the end portion to the flange 1a of the flexible tube 1 through the O-ring 12 with the pressing member 13, the water tightness can be secured by closely contacting the outer periphery of the flexible tube 1, and a new flange can be secured. It can be made compact without being fixed to the pipes D and D. Further, by filling the outer peripheral space corresponding to the thickness of the presser member 13 with the height adjusting member 15 and covering with the pressure-resistant reinforcing member layer 16, a space where the waterstop rubber 14 can freely swell can be eliminated, and the waterstop rubber By covering 14 with the pressure-resistant reinforcing member layer 16, pressure resistance can be reliably imparted. Furthermore, weather resistance can be ensured by covering the outside with a weather-resistant cover member 17, and connection fixing of the flange 1 a and the pipe flange D of the flexible tube 1 in place of the connection bolts and nuts 1 b and 1 c is possible. The displacement restricting rod 21 is inserted between the plate members 20 and 20 fixed by the bolts and nuts 18 and 19 to allow the allowable displacement to be restricted by the length of the rod, so that the displacement is absorbed and the waterproof rubber 14 is damaged. Can be prevented.
Accordingly, the flexible tube 1 in a narrow space such as a water pipe bridge can be reinforced from the outer surface and continuously used as it is, and each member is also lightweight and compact, and can be reinforced easily and in a short time.
The end water-stopping rubber is not limited to the O-ring, but may have another cross-sectional shape, or may have a cross-sectional shape in which a rectangle and a semicircle are combined with a rectangle.

Next, the details of the outer surface reinforcing structure 10 of the existing flexible tube will be described based on each step of the outer surface reinforcing method of the existing flexible tube of the present invention shown in FIGS.
First, as the first step, the connecting bolts and nuts 1b and 1c attaching the flexible tube 1 to the pipe D are removed (see FIG. 3A), and as the second step, the pipe flange F side is long. It replaces | exchanges for the bolts and nuts 18 and 19 for connection fixation for attaching the plate member 20 provided with the protruded thread part (refer FIG.3 (b)). For example, as shown in FIG. 2, the connection bolts / nuts 1b, 1c and the connection fixing bolts / nuts 18, 19 are exchanged at predetermined intervals in the circumferential direction of the flange 1a and the pipe flange F. For example, two of each of six places in the circumferential direction are exchanged.
In addition, as a connection fixing bolt 18, a long hexagon bolt that protrudes toward the pipe flange F may be used if there is a space between the flexible pipe 1 and the flexible pipe 1.

Next, as a third step, in order to flatten the outer periphery of the expansion / contraction part 1d of the flexible tube 1 in which displacement has occurred, a plastic plate 22 or the like serving as a mold is wound between the flanges 1a and 1a, and the gum tape 23 or the like. Then, the filling member 11 is injected and filled into the plastic plate 22 (see FIG. 3C). As the filling member 11, a foaming agent is used. For example, a material capable of foaming a foaming raw material with moisture in the air is used. As a specific foaming agent, foamed urethane or the like is used.
After the filling and filling of the filling member 11 is completed, the plastic plate 22 as the mold may be removed or left as it is.

  Next, as a fourth step, an O-ring 12 is attached to the outer periphery of the flanges 1a, 1a of the flexible tube 1 as an end waterproof rubber for water stop. Before the O-ring 12 is attached, rust on the outer periphery of the flanges 1a and 1a is removed as necessary to eliminate unevenness. The O-ring 12 has a long string-like shape fixed to the outer periphery of the flanges 1a and 1a with an adhesive or the like, and the ends are butted together and bonded to each other with an adhesive (see FIG. 4A).

Thereafter, as a fifth step, a sheet-like waterproof rubber 14 is wound around the outer circumference of the flexible tube 1 flattened by the filling member 11 and the O-rings 12 on the flanges 1a and 1a at both ends. As shown in (b), the side end portions of the water-stopping rubber 14 are abutted against each other, and a bonding sheet 14a is applied to the back side, and the entire surface is bonded with an adhesive and bonded into a cylindrical shape.
This water-stopping rubber 14 uses a rubber having a uniform thickness, and prevents water leakage from the outer peripheral portion when the existing flexible tube 1 is damaged (see FIG. 4B).
By applying such a bonding sheet 14a and bonding with an adhesive, the bonding sheet 14a can be reliably bonded, and can be bonded in a short time without requiring a jig as in the case of vulcanization.

As a sixth step, the both ends of the water stop rubber 14 are fixed by tightening in the circumferential direction by applying the divided presser member 13 to the outer periphery of the flanges 1a, 1a. As shown in FIG. 2, the divided presser member 13 is divided into a plurality of pieces in the circumferential direction, and in the illustrated example, is divided into seven pieces in the circumferential direction, each of which is divided into a ring portion 13 a along the circumferential direction and both ends thereof. And a flange portion 13b protruding in the radial direction attached to the portion. Then, the seven split presser members 13 are connected in an annular shape with bolts / nuts 13c inserted between adjacent flange portions 13b, 13b, and tightened so that the water stop rubber 14 and the O-ring 12 are connected to the outer periphery of the flanges 1a, 1a. And tighten to fix (see FIG. 5A). By tightening the water stop rubber 14 via the O-ring 12 with such a divided presser member 13, both ends of the water stop rubber 14 can be sealed to stop water.
In addition, as shown in FIG. 7B, O-ring grooves 13d and 13e having an arcuate cross section or a rectangular cross section may be formed on the inner peripheral surface of the split ring portion 13a of the split presser member 13. Further, the sealing performance at the O-ring 13 can be improved more reliably and water can be stopped.

Next, as a seventh step, a height adjusting member 15 is provided to fill the outer peripheral space of the water stop rubber 13 corresponding to the thickness of the split ring portion 13a of the split presser member 13 attached to the flanges 1a and 1a at both ends. It is done. As the height adjusting member 15, for example, a foam or rubber band is spirally wound and fixed with an adhesive or the like to fill the space.
By filling the outer peripheral space of the water stop rubber 13 with such a height adjusting member 15, it is possible to eliminate the space where the water stop rubber 13 swells freely, and prevents the water stop rubber 13 from being damaged to prevent water stop. This can be improved (see FIG. 5B).

Further, as the eighth step, the pressure-resistant reinforcing member layer 16 is provided on the height adjusting member 15 thus flat and the split ring portions 13b of the pressing members 13 at both ends. This pressure-resistant reinforcing member layer 16 is for suppressing the expansion of the water-stopping rubber 13 due to the pressure applied to the inner surface of the water-stopping rubber 13, and is laminated as a multiple winding by winding a belt-like cloth covered with rubber in a spiral shape. Formed.
The pressure-resistant reinforcing member layer 16 is wound so that at least the innermost layer 16a is positioned on the split ring portion 13b of the split presser member 13, but the outer layer is not necessarily stacked on the split ring portion 13b. You may make it wind only to the outer side of the member 15 for height adjustment (refer FIG.5 (c)).
The pressure-resistant reinforcing member layer 16 may be selected from the number of layers and the material used so as to withstand the pressure applied to the inner surface of the waterproof rubber 13 in the event that the flexible tube 1 is damaged.

Next, as a ninth step, a weatherproof cover member 17 is provided so as to cover the outer side of the pressure-resistant reinforcing member layer 16, and at least both ends of the innermost layer 16 a overlapping the pressure-resistant reinforcing member layer 16 are tightened by the cover fixing band 24. Pressed and fixed. The weather-resistant cover member 17 is formed of a weather-resistant rubber sheet or the like, and is joined in a cylindrical shape by covering the outer side of the pressure-resistant reinforcing member layer 16 and overlapping side ends. The cover fixing band 24 presses and fixes the pressure-proof reinforcing member layer 16 and the end portions of the weather-resistant cover member 17 by applying and tightening at least one opening to the outside of the weather-resistant cover member 17. Thereby, even if the existing flexible tube 1 etc. is displaced by the length in the tube axis direction of the divided ring portion 13a of the divided presser member 13, the end portions of the pressure-resistant reinforcing member layer 16 and the weather-resistant cover member 17 are detached. Can be prevented (see FIG. 6A).
The pressure-resistant reinforcing member layer 16 and the weather-resistant cover member 17 are more reliably pressed and fixed on the split ring portion 13a of the split presser member 13, and the displacement of the flexible tube 1 can be dealt with more reliably. As shown in FIG. 7 (a), a protruding portion 13f along the circumferential direction is attached to the split ring portion 13a of the divided presser member 13 by welding or the like, and a cover fixing band 24 is arranged on the front and rear sides of the protruding portion 13f in the tube axis direction. Then, it may be double-tightened. Further, the cross-sectional shape of the protruding portion 13f is not limited to the circular cross-section in the illustrated example, but may be other shapes such as a rectangular cross-section. It may be fixed by adhering things. Further, by increasing the width of the split ring portion 13a of the split presser member 13 in the tube axis direction, the end portions of the pressure-resistant reinforcing member layer 16 and the weather-resistant cover member 17 are detached even if the existing flexible tube 1 is displaced. Therefore, the width may be appropriately set according to the allowable displacement.

In the tenth step, which is the last step, the connecting and fixing bolts and nuts 18 and 19 attached in place of the connecting bolts and nuts 1b and 1c for connecting the flanges 1a and 1a of the flexible tube 1 and the pipe flanges F and F are used. The plate member 20 is attached to the pipe flanges F and F, and arranged and fixed at six places in the circumferential direction so as to protrude radially outward on the pipe axis direction outside of the pipe flanges F and F.
The plate member 20 is formed with two through holes for attachment to the flange 1a and the pipe flange F, and one through hole through which the displacement regulating rod member 21 is inserted is formed at a portion protruding radially outward. It is. The plate member 20 applied to the outside of the pipe flange F is fastened by a nut 26 via a washer 25 on the outside of the connection fixing bolts and nuts 18 and 19. Further, a conical plate 20a is welded to the outside of the through hole through which the displacement regulating rod member 21 of the plate member 20 is inserted so as to cope with a change in the direction of displacement.
The displacement regulating rod member 21 is inserted between the plate members 20 and 20, the washers 21 a and the double nuts 21 b are screwed into both ends, and the length between the washers 21 a and 21 a at both ends is the plate member. The distance between the distances 20 and 20 is added to the allowable displacement length. Accordingly, when the flexible tube 1 is displaced beyond the allowable displacement, the displacement regulating rod member 21 is stretched, and further displacement is regulated (see FIG. 6B).

According to the outer surface reinforcing structure 10 of the existing flexible tube and the outer surface reinforcing method, the outer periphery of the flexible tube 1 is filled with the filling member 11 and is flattened, so that the waterproof rubber 14 can be easily attached. And workability can be improved.
Moreover, since the side edge part of the water stop rubber 14 attached to the outer periphery of the flexible tube 1 was joined with the adhesive by applying the joining sheet 14a, it is possible to reliably prevent water leakage from the circumferential end part. In addition, it is not necessary to carry in a jig for on-site heating and pressure bonding, and bonding can be performed in a short time, thereby shortening the construction time.
Furthermore, since both ends of the water-stopping rubber 14 are sealed through the O-ring 12 and tightened by the divided presser member 13, a water-stopping pressure at the O-ring 12 is secured to prevent water leakage from the end. It can be surely prevented.
Further, since the space due to the thickness of the divided presser member 13 formed on the outer periphery of the waterstop rubber 14 is filled with the height adjusting member 15, the waterstop rubber 14 can be prevented from being freely expanded. In addition, pressure resistance and water stoppage can be ensured.
Further, since the pressure-resistant reinforcing member layer 16 is provided on the outer periphery of the water-stopping rubber 14 via the height adjusting member 15, the expansion of the water-stopping rubber 14 due to the pressure applied to the inner surface of the water-stopping rubber 14 is suppressed. And can withstand high pressure (normal pressure: 1.0 MPa).
Moreover, since the outermost periphery is covered with the weather resistant cover member 17, the weather resistance can be ensured, and the range covering the weather resistant cover member 17 is also substantially the range of the flexible tube 1, such as a conventional protective cover, etc. Since a large-sized one is not used, the installation work can be performed in a narrow space.
Furthermore, since at least the innermost layer 16a of the pressure-resistant reinforcing member layer 16 and the weather-resistant cover member 17 are pressed by the cover fixing band 24 on the divided pressing member 13, at least the innermost layer 16a of these pressure-resistant reinforcing member layers 16 and the weather resistance are protected. The separable cover member 17 can be prevented from being detached, and the movement of the divided presser member 13 can be suppressed.
Further, since the plate member 20 is attached to the pipe flanges F and F, and the displacement regulating rod member 21 is inserted between the plate members 20 and 20, a thrust is generated in the pipe axis direction when pressure is applied to the inner surface of the water stop rubber 14. The force that stretches the water-stopping rubber 14 in the direction of the tube axis acts, but the force acting in the direction of the tube-axis can be suppressed, preventing excessive elongation of the water-stopping rubber 14 and lowering the water-stopping property. can do.

Furthermore, according to the outer surface reinforcing structure and the outer surface reinforcing method of the existing flexible pipe, the unit weight of the member used for the outer surface reinforcement is light and can be transported by hand to the site. There is no need for transportation equipment, and waterproofing rubber can be joined using an adhesive with a short curing time, and a special mold for bonding is not required.
Thereby, the member can be easily applied to a medium-diameter tube having a diameter of 900 mm or more or a flexible tube having a large-diameter tube having a large diameter as long as the member can be transported.

  Further, according to the outer surface reinforcing structure and the outer surface reinforcing method of the existing flexible pipe, the protrusion 13f is provided on the divided presser member 13, and the pressure-resistant reinforcing member layer 16 is formed by the cover fixing bands 24, 24 around the tube axis direction. Since at least the innermost layer 16a and the weather resistant cover member 17 are pressed, at least the innermost layer 16a of the pressure-resistant reinforcing member layer 16 and the weather resistant cover member 17 can be more reliably prevented. .

  Furthermore, according to the outer surface reinforcing structure of the existing flexible tube and the outer surface reinforcing method, the O-ring groove 13d and the O-ring groove 13e are formed on the inner peripheral side of the divided presser member 13, so that the tube axis direction of the O-ring 12 is Misalignment can be prevented, and water stoppage can be further improved.

DESCRIPTION OF SYMBOLS 10 External surface reinforcement structure of existing flexible pipe 11 Filling member 12 O-ring (end part waterproof rubber)
13 Dividing presser member 13a Dividing ring portion 13b Flange portion 13c Bolt / nut 13d O-ring groove 13e O-ring groove 13f Protruding portion 14 Water-stopping rubber (water-stopping rubber member)
14a Joint sheet 15 Height adjusting member 16 Pressure-resistant reinforcing member layer 16a Innermost layer 17 Weatherproof cover member 18 Connection fixing bolt 19 Connection fixing nut 20 Plate member 21 Displacement regulating rod member 22 Plastic plate 23 Gum tape 24 Cover fixing band 25 Washer 26 Nut A Abutment B Support C Ring support D Pipe F Pipe flange 1 Flexible pipe 1a Flange 1b Connection bolt 1c Connection nut 1d Extendable part

Claims (6)

An outer surface reinforcing structure of an existing flexible tube that reinforces a flexible tube attached to a pipe line via a flange from the outer surface,
A filling member for forming between the flanges of the flexible tube into a flat outer peripheral surface, and the outer end surface of the flexible tube made flat by the filling member and both end flanges are joined to form a cylindrical shape. In addition, fill the outer peripheral space by the water stop rubber member that is pressed by the divided presser member through the end water stop rubber installed on the outer periphery of the flange to stop the water and the thickness of the split presser member that holds the water stop rubber member. A height adjusting member that suppresses the swelling of the waterproof rubber member, a pressure-resistant reinforcing member layer that covers the space between the pressing members at both ends and the outer periphery of the height-adjusting member to pressure-proof the waterproof rubber member, and the pressure-resistant reinforcing member The weather-resistant cover member that covers the outer periphery of the layer and is pressed and fixed onto the pressing member together with at least the innermost layer of the pressure-resistant reinforcing member layer, and the connection fixing bolt that is attached instead of the connection bolt that connects the flange Hula A plate member for displacement restriction that is attached to a plurality of circumferentially outer pipe axial directions of a pipe flange connected to the pipe and protrudes radially outward, and a length corresponding to a displacement that is inserted and allowed between the plate members An outer surface reinforcing structure of an existing flexible tube, characterized by comprising a displacement regulating rod member having a length to which is added.   The existing flexible pipe according to claim 1, wherein an end water-stopping rubber installed on the outer periphery of the flange is formed of an O-ring, and an O-ring groove is formed on the inner peripheral side of the divided presser member. External surface reinforcement structure.   2. A projecting portion is provided on the outer peripheral surface of the divided presser member, and at least the innermost layer of the pressure-resistant reinforcing member layer and the weather-resistant cover member are pressed and fixed on both sides of the projecting portion in the tube axis direction. Or the outer surface reinforcement structure of the existing flexible tube of 2. An outer surface reinforcing method of an existing flexible tube for reinforcing a flexible tube attached to a pipe line via a flange from the outer surface,
Between the flanges of the flexible tube is formed into a flat outer peripheral surface by a filling member, and the outer peripheral surface and both end flanges of the flexible tube made flat by the filling member are covered with a waterproof rubber member and the side ends are joined. In addition, the end waterproof rubber is installed on the outer periphery of the flange and fixed with the divided presser member, and the outer peripheral space of the waterproof rubber member is expanded by the thickness of the divided presser member. After filling with the height adjusting member to be suppressed, a pressure reinforcing member layer for pressure-proofing the waterproof rubber member is provided to cover between the holding members at both ends and the outer periphery of the height adjusting member, and the outer periphery of the pressure reinforcing member layer A connection-fixing bolt that is provided with a weather-resistant cover member that is pressed and fixed onto the presser member together with at least the innermost layer of the pressure-proof reinforcing member layer, and is attached to a plurality of locations in the circumferential direction instead of the connection bolt that connects the flange Through A plate member for displacement restriction protruding outward in the radial direction is attached to the outer side in the pipe axis direction of the pipe flange connected to the flange, and a length corresponding to the allowable displacement is added between these plate members. A method for reinforcing an outer surface of an existing flexible tube, wherein the displacement regulating rod member is inserted.   The end water-stopping rubber installed on the outer periphery of the flange is formed of an O-ring, and is bonded to the outer periphery of the flange, joined in an annular shape, and pressed by an O-ring groove formed on the inner peripheral side of the divided presser member. The method for reinforcing the outer surface of an existing flexible pipe according to claim 4.   A protrusion is provided on the outer peripheral surface of the divided presser member, and at least the innermost layer of the pressure-resistant reinforcing member layer and the weather-resistant cover member are pressed and fixed on both sides in the tube axis direction of the protrusion. The outer surface reinforcement method of the existing flexible tube of 4 or 5.

Images