JP2005105711A - Manhole remaking method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole remaking method for preventing a remaking material from moving when lining, remaking a section requiring remaking on an inner peripheral wall of a manhole by lining securely, and reducing amount of material and time, labor, and cost required by construction work because ordinary remaking material can be utilized. <P>SOLUTION: The cylindrical remaking material is inserted into the manhole, and a pressurizing bag is inserted into an inner side of the cylindrical remaking material. An upper face part and a lower face part of the pressurizing bag are attached to a collar on which the pressurizing bag is fixed in an upper end part and a lower end part of a hard pipe of the bag by facing outward. A cylindrical bag-like main body is attached by connecting outer peripheral parts of the upper face part and the lower face part mutually. The cylindrical remaking material is heated to raise surface temperature of its inner peripheral face above predetermined temperature. Water or air is pressed into the pressurizing bag to expand it so that the cylindrical remaking material is pressurized from an inner side and its diameter is expanded. An outer peripheral face of the cylindrical remaking material adheres closely to an inner face of the manhole through a backing material arranged between the cylindrical remaking material and the manhole. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for rehabilitating the inner surface of an aged manhole by a lining method.

  Conventionally, as a method of rehabilitating an existing manhole in the sewer system with a lining lining method, the pipe-shaped lining material used for the lining is folded so that its outer diameter is thin enough to be inserted into the existing manhole. After being inserted into the manhole, heat / pressure steam is introduced into the lining material to restore the lining material to its original tube shape, and after further diameter expansion and lining on the manhole wall, it is cooled and solidified. Had been implemented.

  However, the lining material restored by conventional heating / pressurizing steam is generally tube-shaped and relatively thin, so the strength is not sufficiently large, and in general, the existing manhole to be rehabilitated is In many cases, groundwater flows continuously, and in such manholes, rehabilitation with a thin tube-shaped lining material is not sufficient.

  In addition, as the manhole subject to rehabilitation becomes larger, the deepest part becomes deeper, and the external water pressure applied to the lining material after rehabilitation increases, so it is necessary to use a lining material that can withstand it. is there. For example, in the case of the so-called No. 1 manhole, the depth of the deepest part is about 4 m. When relining the lining using a vinyl chloride resin lining material, the thickness of the lining material is usually 15 mm to 20 mm. Otherwise, it cannot withstand external water pressure.

As a method of rehabilitating the manhole using such a thick lining material, a cylindrical lining material made of synthetic resin having a large number of rod-shaped heater insertion holes in the peripheral wall is inserted into the existing manhole, and the tube is formed by the rod-shaped heater. The cylindrical lining material is heated, and the lining material expansion bag is folded and inserted into the tubular lining material in the softened temperature rise state, and the bag is inflated so that the cylindrical lining material is along the inner peripheral wall of the existing manhole. A method is known in which a bag is taken out after being deformed into a deformed shape, and the deformed lining material is cooled and solidified (see, for example, Patent Document 1).
JP-A-5-339977

  However, in the method of Patent Document 1, the strength of the lining material is reduced because the hole for inserting the heater is provided in the peripheral wall. Therefore, in order to ensure the required strength, the method is compared with that without the heater insertion hole. And it must be thicker. Furthermore, there is a trouble of providing a large number of holes in the lining material, which takes time for manufacturing. In addition, after expanding the diameter of the lining material, a filler such as a polymer cement paste is poured into the insertion port of the rod heater, so that the rod heater is buried and there is a problem that the construction cost becomes high. .

  Further, in Patent Document 1, the lining material expansion bag is a tent fabric or other airtight woven fabric, and after introducing pressurized steam into the tent material or other airtight woven fabric, the lining material is deformed along the manhole wall. The steam is switched to air for cooling. However, in this method, the lining material expansion bag is folded and inserted into the lining material before the expansion, and when the bag is expanded, the bag increases in diameter and simultaneously expands upward or downward. I will do it. Therefore, when the bag is inflated, the lining material that contacts the outside of the bag is moved upward or downward, and the lining material that is initially set moves to shift its position, making it impossible to line the necessary portion. There is a fear.

  The present invention has been made in view of the above circumstances, the rehabilitation material does not move at the time of lining, it is possible to reliably renew the lining where the rehabilitation of the inner wall of the manhole is necessary, and because a normal rehabilitation material can be used, The object is to provide a manhole rehabilitation method that can reduce the labor and cost of materials and construction work.

  The manhole rehabilitation method according to claim 1 of the present invention (invention 1) is a manhole rehabilitation method in which a manhole inner circumferential surface is rehabilitated with a tubular rehabilitation material made of a thermoplastic resin that expands by being heated and pressurized from the inside. A tubular rehabilitation material is inserted into the manhole, and a pressure bag is inserted inside the tubular rehabilitation material. The pressure bag is formed of a flexible material, and the upper and lower ends of the rigid tube of the bag. The upper surface portion and the lower surface portion of the pressure bag are attached to the bag fixed outwardly, and the cylindrical bag-like main body is attached by connecting the outer peripheral portions of the upper surface portion and the lower surface portion. Alternatively, an air pressure inlet is provided, a water or air outlet is provided on the lower surface, and the axial length of the cylindrical bag-shaped body is equal to or greater than the axial side wall length of the rehabilitated manhole, The expanded diameter of the bag-shaped body is larger than the expanded inner diameter of the tubular rehabilitation material. The cylindrical rehabilitation material is heated from the inside by heating the cylindrical rehabilitation material so that the surface temperature of the inner peripheral surface is equal to or higher than the predetermined temperature, and pressurizing and expanding water or air into the pressure bag. The outer diameter of the tubular rehabilitation material is brought into close contact with the inner surface of the manhole through a backfilling material arranged between the tubular rehabilitation material and the manhole.

  The invention according to claim 2 (invention 2) is the manhole rehabilitation method according to invention 1, characterized in that the tubular rehabilitation material is a foam of a thermoplastic resin.

  The cylindrical rehabilitation material used for this invention will not be restrict | limited especially if it is a cylindrical body made from a synthetic resin which expands when heated and pressurized from the inside. That is, for example, thermoplastic synthetic resin pipes such as PVC (polyvinyl chloride), PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PS (polystyrene) and the like. As another example, for example, a PVC pipe is extruded, and the pipe is reduced in diameter within a temperature range of Tg to Tg + 40 ° C. and deformed to have a small diameter or cooled, or is inserted into a concave shape along the axial direction. And a tube deformed so that the outer diameter is reduced by cooling by deforming into a concave cross section. This tube is a tube having a so-called shape memory property in which the shape is restored to a circular shape or the diameter is restored to the original thickness by heating to Tg or more.

  The thickness of the rehabilitated material is appropriately determined according to the depth of the rehabilitated manhole. For example, when the No. 1 manhole (outside diameter 900 mm, side wall length 4 m in the manhole inner axial direction) is lining rehabilitated with the PVC shape memory tube, the thickness of the rehabilitation material is 15 mm or more. In the present invention, the method for heating the rehabilitated material is not particularly limited. That is, the outer side or the inner side of the rehabilitation material may be heated with high-temperature steam or hot air, etc., and an electric heater or the like is brought into contact with the outer surface or the inner surface to generate heat, and the heater is removed when a predetermined temperature is reached. .

  The outer diameter of the tubular rehabilitation material is deformed so as to be thinner than the diameter of the manhole to be rehabilitated. Therefore, it becomes easy to insert the tubular rehabilitation material into the manhole from the entrance of the manhole for rehabilitation work.

  The tubular rehabilitation material may be a foam obtained by extruding and molding the above-mentioned various resins, foamed 5 to 20 times, and crosslinked. The foam in this case preferably has a heat resistance of 100 ° C. or higher, and has a low heat shrinkage ratio and high rigidity as compared with conventional PE foam and EVA (ethylene vinyl acetate copolymer resin). . If the heat shrinkage rate is too high, it may shrink when hot water flows after rehabilitation, and if the rigidity is too low, there is a possibility of bending inside after rehabilitation. What is necessary is just to select suitably and use according to a size or depth. Since it will become lightweight if it is a foam, lining work becomes easy. Further, the foam may be made of a reclaimed resin.

  The pressurizing bag of the present invention has an action of being inserted into a tubular lining rehabilitation material, pressurizing a pressurizing fluid into the bag and inflating, and pushing the lining material from the inside. Therefore, the pressure bag itself does not necessarily require a high elongation rate.

  The pressurized bag is made of flexible material as the material of the bag because the fluid press-fitted into the bag is heated with high-temperature steam or hot air to heat the tubular rehabilitation material placed outside the pressurized bag. It is preferable that it is excellent in heat resistance and pressure resistance. Further, since the fluid is not damaged or leaks out, a high degree of airtightness is required. As a material satisfying such conditions, for example, thermoplastic resins such as PE, PP, vinyl resin, amide resin, etc. reinforced with organic fiber, glass fiber, etc .; synthetic rubber reinforced with fiber similarly Or the like, or a woven fabric represented by a fire hose or the like.

  The pressurized bag has a cylindrical shape, and the outer diameter after the bag is expanded needs to be equal to or larger than the inner diameter of the rehabilitated pipe after the expansion. For example, when it is used when rehabilitation of No. 1 manhole (outer diameter 900 mm), it shall be 800 mm to 900 mm. The height should just ensure the length corresponding to the depth of the manhole to be rehabilitated, ie, the length from a manhole cover part to an invert part.

  The cylindrical pressurized bag is press-fitted with a pressurized fluid therein. Therefore, when an internal pressure is applied, a force that expands in the upper or lower direction of the cylinder in addition to the diametrical direction works, so it is necessary to restrain the force acting in the upward or downward direction so that the bag does not move during the expansion. . For this purpose, the pressure bag used in the present invention is attached to the upper end and the lower end of a hard tube such as an iron tube as a core tube, and the upper surface portion and the lower surface portion of the pressure bag are attached to the flange. Mounting, the outer peripheral part of this upper surface part and a lower surface part is connected, and a cylindrical bag main body is attached and comprised. Water or air pressure inlets are provided on the upper surface, and those outlets are provided on the lower surface. If the pressure inlet or outlet is provided on the side surface of the cylindrical pressure bag, water or air cannot be pressed in, and it is difficult to discharge them after lining. What is necessary is just to provide in a collar part, an upper surface part, or a lower surface part.

  That is, the pressure bag is fixed to the core tube, the flange portion fixed to the top and bottom of the core tube, the cylindrical pressure bag body made of a flexible material, and the pressure bag body and the flange portion. It is composed of a sealed upper and lower surfaces, and pressurized fluid is pressed into the space formed by them to expand the diameter of the cylindrical pressurizing bag and not to extend in the axial direction. Is. However, when the diameter of the upper surface portion or the lower surface portion fixed to the collar portion can be inserted into the manhole and is sufficiently large, when the pressure bag is expanded and expanded in the manhole, the inner wall of the upper portion of the manhole or Since it hits the inner wall of the bottom portion and does not move any more, a core tube is not always necessary.

  The outer diameter of the gutter attached to the upper surface part or the lower surface part is made smaller than the diameter of the tubular rehabilitation pipe folded with a thin outer diameter. Therefore, the cylindrical pressure bag can be inserted into the inserted tubular rehabilitation pipe in the manhole. Further, the length of the core tube is made to substantially coincide with the depth of the manhole to be rehabilitated, that is, the side surface length of the manhole to be rehabilitated. If the pressure bag is too short, even if the pressure bag is inflated, the inside of the tubular rehabilitation material may not be evenly contacted, and the tubular rehabilitation material may be unevenly expanded or not expanded. The length of the pressure bag is not particularly limited because the lining is performed even if it is longer than the length of the inner wall to be rehabilitated along the axial direction of the manhole. Therefore, the workability at the time of lining deteriorates, so it may be selected appropriately according to the situation.

  The core pipe such as an iron pipe has a function of preventing the pressure bag from expanding upward or downward with the hooks attached to the upper and lower sides thereof, and its weight is moderately heavy. The effect of the weight that is used for not moving greatly is demonstrated. Therefore, when the rehabilitated material is spread from the inside, the rehabilitated material is less likely to move from the initial position of the rehabilitated material, and the lining is reliably performed.

  The heel has a hard disk shape. The disc-shaped ridge may or may not be provided with a through hole at the center. Regardless of the shape, the center of the disk-shaped ridge and the center of the core tube coincide with each other and are fixed to the end of the core tube. Since the bag has a function of preventing the upper surface portion or the lower surface portion of the pressure bag from being fixed around the bag and bulging upward or downward, it may be a hard plate having high bending strength. For example, thermoplastic resin plates such as PVC, PE, PP, and PET; fiber reinforced resin plates such as thermoplastic resin or thermosetting resin reinforced with glass fiber, carbon fiber, synthetic resin fiber, etc .; iron, aluminum, stainless steel Examples of such a metal plate include a wooden plate and a natural plate such as a composite plate of wood and synthetic resin.

  The core tube and the rod are welded, bonded, or the end portion of the core tube is folded into a flange shape depending on the material of which they are configured, and a through hole is provided there, and a through hole is also provided in the rod, and a bolt or the like is provided in the through hole. What is necessary is just to fix according to a situation suitably, such as the method of inserting and fastening with a nut.

  As an example of the pressure inlet or discharge port mounting structure, for example, a male part such as a coupler is fixed to a collar part on the upper surface or the lower surface, and a heat-resistant or pressure-resistant hose with a female part such as a coupler is inserted into this. Examples include the structure. In addition, the method for opening and closing the flow path of the pressure inlet or outlet may be a method using a normal opening and closing valve. If the valve position is near the bottom of the manhole, an opening and closing lever is provided on the upper surface of the pressure bag, and the valve and the opening and closing lever And a valve can be opened and closed by moving the lever.

  The method of attaching the pressure inlet or the like is not particularly limited as long as it is attached by a method that does not leak steam, water, air, or the like from the attachment portion. For example, when a fluid pressure inlet is provided on the upper surface, a through-hole is provided in the collar portion constituting a part of the pressurized bag or the upper surface portion of the pressurized bag, and a hard tube is screwed or welded to the through-hole. For example, a method of fixing by a method such as adhesion and attaching a valve thereto may be used. In addition, there may be mentioned a method in which a through hole is provided in the tube wall of the core tube, a bent joint such as an elbow is fixed to the through hole and bent upward, and a hard tube is connected thereto.

  The attachment method of the upper surface portion of the bag and the pressure bag or the lower surface portion of the pressure bag is not particularly limited as long as it is attached by a method in which steam, water, air, etc. do not leak from the attachment portion. For example, a holding ring with the same outer diameter as the outer diameter of the collar is prepared, a plurality of screw holes that penetrate the retaining ring and the collar are provided, and the upper surface made of the flexible material is covered with the collar. There is a method of arranging and opening the through-hole location hole, placing a pressing ring from above, inserting a bolt into the through-hole, and fixing with a nut.

  In the present invention, since the pressurizing bag does not expand upward or downward, the rehabilitation material placed first does not move. Therefore, the rehabilitation material can surely line up the part that requires rehabilitation of the inner wall of the manhole. Furthermore, the rehabilitation material used for that purpose should just apply the rehabilitation material for general lining rehabilitation, and does not require the extra effort and cost concerning manufacture and construction.

  Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an example of a state in which a tubular rehabilitation material having shape memory performance is inserted into an existing manhole and a folded pressure bag is inserted into the inside of the existing manhole. FIG. 2 is a longitudinal sectional view showing a state in which the pressurized bag is expanded and the tubular rehabilitation pipe is lined on the manhole peripheral wall through mortar or the like. 3 and 4 are longitudinal sectional views showing an example of the structure of the pressure bag used in the present invention.

  The rehabilitation material 1 for PVC lining rehabilitation, whose shape is restored to a circular shape by heating and pressurizing from the entrance of the manhole M, is inserted into the existing aging manhole M, and the center of the manhole bottom invert The cylindrical pressure bag is folded and inserted into the rehabilitation material 1. The rehabilitated material is measured so that the lower end is opened and the length is the same as the inner wall length of the manhole.

  FIG. 2 is a cross-sectional view showing the structure of the pressure bag 2 used here. Iron iron rods 31 and 32 are welded outward at both ends of the iron pipe core tube 3, and the upper end surface 21 and the lower end surface 22 of the flexible pressure bag 2 in which the inner surface of the tent is rubber-lined are respectively provided. It is attached. The upper end surface 21 of the pressure bag is sandwiched between the upper ridge 31 and the fixing ring 311, and the lower end surface 22 is sandwiched between the lower ridge 32 and the fixing ring 321, and is fixed with bolts and nuts, respectively. Yes. The body 22 of the pressure bag 2 is attached in a cylindrical shape to the circumferential portions of the upper end surface 21 and the lower end surface 22 of the pressure bag 2, and the core tube 3, the upper and lower flanges 31 and 32, the upper surface portion 21, A space is formed by the lower surface portion 22 and the pressurizing bag 2 main body 23. The upper flange 31 is provided with a steam pressure inlet 5 so that high-temperature and high-pressure steam from a boiler (not shown) arranged outside is supplied into the pressurized bag 2.

  Note that the structure of the pressure bag is not limited to the structure shown in FIG. 2, and for example, the structure shown in FIG. 3 may be used. FIG. 3 is a sectional view showing the upper half of another example of the structure of the pressure bag 2. In this case, an upper support washer 42 (lower support washer 43) is provided at the upper end portion of the iron bar 4 whose both ends are male threads 41, and the support washers 42, 43 are covered so as to be made of a cylindrical rubberized cloth. A pressure bag 2 is covered. A support washer 42 and an upper pressing washer 421 are fixed with nuts across the upper surface portion 21 of the pressure bag 2. The lower half (not shown) has the same structure as the upper half, and a lower support washer 43 and a pressure washer 431 are fixed by nuts 44 with the lower surface portion 22 of the pressure bag 2 interposed therebetween. . In this structure, the space into which the pressure fluid is press-fitted is the entire pressurization bag, and the pressurization hole for the pressure fluid, the safety valve, or the drain valve (none of them are shown) are the upper surface portion 21 or the lower surface portion 22 of the pressurization bag 2. Provided.

  The upper flange 41 is provided with a safety valve 6 for venting and preventing excessive pressure rise. Further, a drain valve 7 is provided on the side surface of the core tube 9 in the vicinity of the lower flange 42, and the valve 7 can be opened and closed with an opening / closing rod 71 from above the manhole M.

  The lining rehabilitation work is first performed by heating the rehabilitation material 1. For that purpose, hot steam is press-fitted into the inside of the pressurizing bag 2 and is expanded to such an extent that it is expanded slightly while touching the inside of the reclaimed material 1. If left in this state, the surface of the rehabilitated material 1 is heated by steam injected into the pressure bag, and when the temperature exceeds Tg, the rehabilitated material 1 restores its shape to the original circular shape. If steam is additionally injected as the shape of the rehabilitated material is restored, the rehabilitated material 1 is restored more quickly and reliably, and is completely restored to the original circular shape.

  When the rehabilitation material 1 is restored to a circular shape, steam is further injected and the pressure bag 2 is expanded. At this time, the vertical direction of the pressurizing bag 2 is restricted by the core tube 3, the upper flange 41, and the lower flange 42, and does not move upward or downward. Therefore, the rehabilitation pipe | tube 1 which is contacting the outer peripheral surface of the pressurization bag 2 does not move to an up-down direction, but expands a diameter uniformly only in the circumferential direction.

  When the outer peripheral surface of the rehabilitation pipe is close to the wall surface of the manhole, mortar, resin concrete, or other backfilling material is provided between the inner peripheral surface of the mantle and the outer peripheral surface of the rehabilitation material while stopping the pressure of water vapor. Press fit. When press-fitting mortar or the like, air is vented while giving sufficient vibration so that no air remains. Usually, since the temperature of the backfilling material is lower than the surface temperature of the rehabilitated material 1 whose diameter has been expanded during lining, the surface of the rehabilitated material 1 is cooled and the rehabilitated material 1 maintains its shape.

  The open / close valve 7 is opened by the open / close bar 72 and the steam is extracted from the pressurized bag 2. Thereafter, when water is pressed into the pressurizing bag 2, the rehabilitation pipe 1 is also cooled from the inside and the shape thereof is securely fixed, and the lining of the inner peripheral wall surface of the manhole M is completed. After completion, water or the like is drained from the pressure bag, and the pressure bag 2 is removed from the entrance of the manhole M. Thereafter, the sewage pipe portion connected to the manhole is opened to appropriately repair the sewage pipe connection port, the inversion of the bottom surface is repaired, and the rehabilitation of the manhole M is completed.

  When the bottom surface of the manhole M is not inverted, the rehabilitation material 1 may have a bottomed cylindrical shape. That is, in the case of a manhole without inversion, if the manhole bottom surface is repaired in advance and then the manhole M peripheral wall is repaired in the same manner as described above, the manhole bottom surface is also repaired at the same time. Then, if the sewer pipe part connected to the manhole M is opened and the manhole connection port is opened and appropriately repaired, the rehabilitation of the manhole M is completed.

  In addition, the method of making a rehabilitation material into a bottomed cylinder shape is not specifically limited, What is necessary is just to be performed by the general blow molding method.

It is a longitudinal cross-sectional view which shows an example of the state by which the tubular renovation material which has shape memory performance of this invention was inserted in the existing manhole, and the pressure bag folded further was inserted in the inside. It is a longitudinal cross-sectional view which shows a mode that the pressurization bag expand | swells and has lined the cylindrical renovation pipe | tube to the manhole surrounding wall via mortar etc. It is a longitudinal cross-sectional view which shows an example of the structure of the pressurization bag used for this invention. It is a longitudinal cross-sectional view which shows another example of the structure of a pressurization bag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rehabilitation pipe 2 Pressurization bag 21 Upper surface part 22 Lower surface part 23 Cylindrical main-body part 3 Core pipe 31, 32 collar part 311,321 Fixing ring 4 Core rod 41 Male screw 42, 43 Support washer 421,431 Pressing washer 44 Nut 5 Steam Pressure inlet 6 Air vent / overpressure prevention valve 7 Drain valve 71 Opening / closing bar 8 Backfill material M Manhole

Claims (2)

  In the manhole rehabilitation method in which the inner periphery of the manhole is rehabilitated with a tubular rehabilitation material made of thermoplastic resin that expands when heated and pressurized from the inside, a tubular rehabilitation material is inserted into the manhole and inside the tubular rehabilitation material A pressure bag is inserted, and the pressure bag is made of a flexible material and is fixed outwardly to the upper end and lower end of the rigid tube of the bag. A cylindrical bag-like body is attached by connecting the outer peripheral portions of the upper surface portion and the lower surface portion, a water or air pressure inlet is provided on the upper surface portion, and a water or air discharge port is provided on the lower surface portion. The axial length of the cylindrical bag-shaped main body is equal to or longer than the axial side wall length of the rehabilitated manhole, and the diameter after expansion of the cylindrical bag-shaped main body is after the expansion of the cylindrical reclaimed material. The inner surface of the tubular rehabilitation material is heated to increase its surface temperature. The inside of the pressurized bag is expanded by pressurizing water or air into the pressurized bag to expand the diameter and pressurizing the tubular rehabilitation material from the inside. A manhole rehabilitation method characterized in that a cylindrical rehabilitation material outer peripheral surface is closely attached to a manhole inner surface through a material. 2. The manhole rehabilitation method according to claim 1, wherein the tubular rehabilitation material is a foam of a thermoplastic resin.

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