EP0849404A1 - Procédé de réparation de la face intérieure d'un trou d'homme - Google Patents

Procédé de réparation de la face intérieure d'un trou d'homme Download PDF

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Publication number
EP0849404A1
EP0849404A1 EP96309422A EP96309422A EP0849404A1 EP 0849404 A1 EP0849404 A1 EP 0849404A1 EP 96309422 A EP96309422 A EP 96309422A EP 96309422 A EP96309422 A EP 96309422A EP 0849404 A1 EP0849404 A1 EP 0849404A1
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EP
European Patent Office
Prior art keywords
manhole
repairing
repairing material
material structure
materials
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96309422A
Other languages
German (de)
English (en)
Inventor
Shinya Tokai Rubber Industries LTD. Uda
Okusa Tokai Rubber Industries LTD. Ishihara
Isao Tokai Rubber Industries LTD. Natsubori
Shuichi Tokai Chemical Ind. LTD. Takahashi
Tokai Chemical Ind. LTD. Mizukami Isao
Mitsuyoshi Tokai Chemical Ind. LTD. Kondo
Katsumi Kansei Kogyo Co. LTD. Nakamura
Hisashi Kansei Kogyo Co. LTD. Niwa
Yoshiki Nisso Shoji Co. LTD. Kato
Shuji Nisso Shoji Co. LTD. Miura
Yutaka c/o Nisso Petrochemical Ind. Co. LTD Tano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokai Chemical Industries Ltd
Sumitomo Riko Co Ltd
Kansei Co
Nisso Shoji Co Ltd
Original Assignee
Tokai Chemical Industries Ltd
Sumitomo Riko Co Ltd
Kansei Co
Nisso Shoji Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tokai Chemical Industries Ltd, Sumitomo Riko Co Ltd, Kansei Co, Nisso Shoji Co Ltd filed Critical Tokai Chemical Industries Ltd
Priority to EP96309422A priority Critical patent/EP0849404A1/fr
Publication of EP0849404A1 publication Critical patent/EP0849404A1/fr
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/02—Manhole shafts or other inspection chambers; Snow-filling openings; accessories

Definitions

  • This invention relates to a manhole surface repairing method, and more particularly to a method for repairing an inner surface of a manhole structure by lining, and a manhole repairing material for forming a lining layer, a closing member for preventing leakage of an impregnating material for lining and an expansion equipment for expanding a manhole repairing material which are suitable for use for the manhole surface repairing method.
  • a manhole structure (hereinafter also referred to as "manhole") is generally constructed of concrete, resulting in an inner surface thereof being subject to corrosion by hydrogen sulfide produced in an underground pipe such as a sewage pipe and/or sulfur oxides contained in rainwater over a long period of time.
  • the manhole structure is typically laid under a public road, so that cracks tend to occur in the inner surface of the manhole due to vibration applied thereto from vehicles traveling on the road.
  • Such corrosion and cracks occurring on the inner surface of the manhole as described above cause ground water to enter an underground pipe such as a sewage pipe. Penetration of ground water into the sewage pipe increases the amount of sewage, leading to an increase in the number of steps in sewage disposal. Also, further advance of the corrosion and cracks may lead to collapse or cave-in of the manhole structure. Thus, it is required to carry out repairing and/or maintenance of the inner surface of the manhole structure timely.
  • a conventional method for repairing the inner surface of the manhole structure is generally practiced by securing a manhole repairing material of a cylindrical shape to the inner surface of the manhole, as disclosed in, for example.
  • a manhole surface repairing method constructed so as to spray liquid resin containing a ceramic material, liquid hard urethane resin or the like onto the inner surface of the manhole to form a lining layer thereon is likewise employed for this purpose.
  • Formation of the lining layer or repairing material on the inner surface of the manhole under conditions that the inner surface is substantially subject to severe corrosion or cracks leads to a disadvantage that the lining layer or repairing material is rugged due to the corrosion or cracks, to thereby fail in satisfactory repairing of the inner surface. Also, spraying of the liquid resin onto the inner surface of the manhole for forming the lining layer thereon fails to satisfactorily apply the resin to a portion of the inner surface through which ground water enters the manhole, to thereby often cause the lining layer to be peeled off therefrom.
  • a pretreatment is required wherein the inner surface is cleaned by means of high-pressure water and then a water-leakage portion of the inner surface is sealed with quick-setting cement, followed by repairing of roughness on the inner surface by means of mortar to smooth the inner surface.
  • a long period of time as long as several days is generally required for completion of the pretreatment, leading to a deterioration in operational efficiency and a traffic trouble such as a traffic jam, roadblocking or the like.
  • Additional manhole repairing techniques are disclosed in Japanese Patent Application Laid-Open Publication No. 301238/1993, wherein a flexible manhole repairing material including an upper section, a peripheral section and a bottom section is used. Then, cement milk is charged or cast into a relatively large gap between the manhole repairing material and an inner surface of a manhole structure and than cured.
  • the flexible manhole repairing material tends to cause roughness or ruggedness to be formed on an inner surface thereof, to thereby fail to provide a satisfactory lining layer.
  • the present invention has been made in view of the foregoing disadvantage of the prior art.
  • a method for repairing an inner surface of a manhole structure by lining comprises the steps of arranging a thin-wall repairing material structure in the manhole so as to cover or lay the inner surface of the manhole with a gap being defined between the repairing material structure and the inner surface of the manhole and charging the gap with a liquid cold setting impregnating material for lining, followed by curing of the impregnating material.
  • the repairing material structure is formed so as to have rigidity sufficient to exhibit self-supporting characteristics and formation of a lining layer is not practiced while keeping the repairing material structure pressed directly against the inner surface of the manhole, so that the repairing material structure is kept from being formed with undulations corresponding to roughness on the inner surface of the manhole.
  • the cold setting impregnating material charged between the inner surface of the manhole and the repairing material structure fully enters a corroded portion and cracks of the inner surface, to thereby exhibit sufficient waterstop and reinforcing functions.
  • cleaning of the inner surface using high-pressure water or a rotary brush is merely required as a pretreatment therefor.
  • the manhole structure is so constructed that an entrance thereof has a diameter smaller than that of an intermediate or lower section thereof.
  • the repairing material structure is inserted into the manhole while being deformed or shrunk into a shape sufficient to permit it to pass through the entrance of the manhole.
  • the repairing material structure is required to exhibit rigidity or stiffness to a degree.
  • the repairing material structure includes a cylindrical body made of a plastic material and provided with one vertically extending cut, to thereby be expandable. Such construction permits the repairing material structure to be not only readily inserted into the manhole but released from overlap thereof in the manhole, resulting in the structure being expanded to a degree sufficient to satisfactorily cover the inner surface of the manhole.
  • the manhole is typically formed at an upper portion thereof into a frust-conical shape, to thereby be gradually reduced in diameter toward an entrance thereof.
  • the repairing material structure includes both a frust-conical section and a cylindrical section. Integral formation of the frust-conical section and cylindrical section renders reduction in diameter or shrinkage of the repairing material structure often difficult.
  • the frust-conical and cylindrical sections are formed separately from each other and the cylindrical section is first inserted into the manhole while being shrunk, followed by insertion of the frust-conical section into the manhole while being shrunk.
  • the frust-conical section is generally carried on an upper end of the cylindrical section.
  • the cold setting impregnating material is charged outside the cylindrical section after arrangement thereof in the manhole and then the frust-conical section is arranged in the manhole, followed by charging of the impregnating material outside the frust-conical section.
  • the impregnating material is charged outside both sections.
  • the method of the present invention comprises the steps of providing a plurality of thin-wall cylindrical repairing materials formed of a plastic substance so as to cover a vertical surface section of an inner surface of a manhole and each provided with one vertically extending cut and a thin-wall cylindrical repairing material formed of a plastic substance so as to cover an inclined surface section of the inner surface of the manhole and provided with one vertically extending cut, inserting the repairing materials into the manhole while reducing a diameter of the repairing materials to overlap both ends thereof defined at the cut of each of said repairing materials each other and laying the repairing materials on each other by fitting, expanding the repairing materials during or after the laying by fitting, to thereby lay or cover the inner surface of the manhole with the repairing materials with a gap being defined between the repairing materials and the inner surface of the manhole, and charging a liquid cold setting impregnating material in the gap between the inner surface of the manhole and the repairing materials and curing the impregnating material.
  • the vertical surface section of the inner surface of the manhole is generally formed into a relatively increased height, therefore, it is substantially difficult to cover the vertical surface section with a single repairing material of a large height. Also, arrangement of such a single repairing material renders uniform expansion Of the whole repairing material substantially difficult. In order to minimize the problem, an approach that the repairing material is first expanded at an upper end thereof and then expanded at a lower end thereof would be considered. However, such gradual expansion of the repairing material increased in height tends to lead to distortion or deformation of the material. Overlaying of the vertical surface section with the plural repairing materials laid on each other which is carried out in the present invention permits the repairing materials to be uniformly expanded either concurrently or successively without causing distortion or deformation of the materials.
  • the repairing material arranged for covering the inclined surface section of the inner surface of the manhole as desired includes a frust-conical section and a short cylindrical section formed into a length or height reduced sufficiently so as not to interfere with an overlap at a lower end of the frust-conical section.
  • the short cylindrical section is put or laid on an upper end of the repairing material for covering the vertical surface section and preferably stackedly fitted in the upper end of an increased diameter. Laying of the repairing materials on each other is carried out by fitting between the materials. This may be readily and stably accomplished using a suitable fitting means.
  • one of a lower end of upper one of each adjacent two of the repairing materials and an upper end of lower one thereof is formed into a diameter larger than the other, wherein laying of the repairing materials on each other is carried out by fitting between the lower end and the upper end.
  • Such construction prevents any step from being formed between the repairing materials.
  • Sealing of the vertically extending cut after the repairing material is expanded in the manhole may be carried out by means of butt members arranged at the above-described both ends of the repairing material defined at the cut so as to be opposite to each other in a peripheral direction thereof.
  • both ends are preferably overlapped.
  • the two ends are formed into inner diameters different from each other, resulting in prevent any step from being formed at the overlap.
  • the repairing material is generally formed into a shape corresponding to that of the inner surface of the manhole.
  • the inner surface of the manhole is formed into a suitable cross-sectional shape such as a circle, a rectangle or the like.
  • a suitable cross-sectional shape such as a circle, a rectangle or the like.
  • the term “cylindrical” or “cylinder” used herein indicates a circular-shape, as well as a non-circular shape.
  • expansion means outward expansion or enlargement.
  • the repairing material is integrally provided thereon with a plurality of vertically extending projections for gap formation in a manner to be distributed in a peripheral direction thereof or a plurality of small projections for gap formation, wherein the repairing material is arranged in the manhole while pressing the projections against the inner surface of the manhole.
  • the vertically extending projections may be arranged so as to vertically extend in a manner to be either continuous or intermittent as desired.
  • the projections each may be formed on an outer end thereof with any corrugation or recess, to thereby facilitate passage of the cold setting impregnating material between the projections and the inner surface of the manhole.
  • the projections are gonerally formed into a height corresponding to the gap to be formed. Formation of the projections is carried out during molding of the repairing material and generally causes an inner surface of the projections to be recessed. This minimizes an increase in weight of the repairing material.
  • the cold setting impregnating material for lining is generally inexpensive and exhibits satisfactory adhesive properties and is preferably selected from the group consisting of epoxy resin, acrylic resin and unsaturated polyester resin.
  • water glass or cement milk may be suitably used as the impregnating material.
  • Plastic materials for the repairing material include thermoplastic materials such as polyethylene, polypropylene, vinyl chloride, polyamide and the like and thermosetting plastic materials such as unsaturated polyester, acrylic resin, epoxy resin and the like.
  • fiber reinforced plastic exhibiting increased adhesive properties with respect to resin, in particular, fiber reinforced unsaturated polyester is effectively used.
  • the repairing material is formed so as to exhibit a modulus in flexure between 100 kg/mm 2 and 1500 kg/mm 2 .
  • the modulus in flexure below 100 kg/mm 2 causes the repairing material to tend to be substantially inwardly curved by its own gravity and a pressure of the impregnating material and undulate depending on roughness of the inner surface of the manhole structure.
  • the modulus above 1500 kg/mm 2 causes deformation of the repairing material required for insertion thereof into the manhole to be highly hard.
  • the gap between the inner surface of the manhole and the repairing material is defined to be between 2 mm and 10 mm.
  • the gap below 2 mm renders charging of the impregnating material difficult, causes air trapping therein and fails to permit the impregnating material to be spread to a lower end of the gap.
  • the gap above 10 mm leads to waste of the impregnating material and tends to cause excessive shrinkage of the impregnating material during curing thereof, resulting in undulation of the repairing material.
  • the cold setting impregnating material for lining is preferably 3000 cSt in kinematic viscosity at 25°C. The kinematic viscosity above 3000 cSt renders charging of the impregnating material into the gap difficult, causes air trapping in the gap and fails to permit the impregnating material to be spread to a lower end of the gap.
  • the viscosity is preferably reduced.
  • charging of the impregnating material reduced in viscosity into the gap at a stretch tends to cause leakage of the impregnating material from the lower end of the repairing material.
  • the cold setting impregnating material for lining may be charged and cured after a liquid curable waterstop material is charged in the gap between the inner surface of the manhole and the repairing material and cured.
  • Liquid rubber such as liquid urethane resin, polybutadiene or the like may be used as the liquid curable waterstop material; however, epoxy resin, acrylic resin or unsaturated polyester resin as in the cold setting impregnating material may be conveniently used for this purpose.
  • the repairing material is preferably provided et the lower end thereof with a sealing material to ensure tight sealing between the lower end of the repairing material and a bottom surface of the manhole. Water-cured epoxy resin, moisture-cured silicone, mortar or the like may be used as the sealing material.
  • the repairing material arranged in the manhole is provided at the lower end thereof with the sealing material and then charging of the cold setting impregnating material or curable waters top material is carried out, so that liquid leakage from the lower end of the repairing material structure is more effectively prevented.
  • the sealing material may be typically applied to both an inside of the lower and of the repairing material and the bottom surface of the manhole.
  • the gap between the repairing material and the inner surface of the manhole is formed into a reduced width, so that a non-charged region may possibly be formed in the gap even when the charging operation is carefully executed.
  • the repairing material is rendered transparent or semi-transparent so as to permit charging of the impregnating material to be visually observed, the charging operation may be efficiently and satisfactorily accomplished. Also, when the charging operation takes place in several times, the impregnating material may be accurately charged into a desired height.
  • the bottom surface of the manhole is typically formed in a manner to be downwardly inclined from both sides thereof toward a water channel formed on the bottom surface of the manhole so as to extend through a center of the bottom surface.
  • the repairing material is preferably formed at the lower end thereof into a shape corresponding to undulation of the bottom surface of the manhole, to thereby ensure stable arrangement of the repairing material in the manhole and prevent liquid leakage from the lower end of the repairing material. More specifically, the lower end of the repairing material is preferably supported on the bottom surface of the manhole entirely or substantially entirely or through three or four points.
  • the inner surface of the manhole is provided at a lower portion thereof with sewage pipe openings, so that it is required to close each of the openings with a closing member in order to prevent leakage of the impregnating material to the opening. Similarly, it is also required to prevent leakage of the impregnating material to the water channel.
  • the closing members each include a rear plate formed so as to be curved in correspondence to a portion of the inner surface of the manhole positioned at the sewage pipe opening and a support bottom formed so as to inwardly extend from the rear plate, as well as a front plate arranged inside the support bottom so as to define a receiving groove of a reduced width between the front plate and the rear plate.
  • the closing member is so arranged that the support bottom extends across the water channel.
  • the repairing material is supported at the lower end thereof on the support bottom. Tight sealing is established between the repairing material and the support bottom, to thereby further prevent the liquid leakage. Also, arrangement of the lower end of the repairing material in the receiving groove effectively provides sufficient sealing between the repairing material and the closing member and ensures stable supporting of the repairing material on the bottom surface of the manhole.
  • the cylindrical repairing material may be kept expanded by manually expanding the repairing material and fixing the vertically extending cut by means of an adhesive tape.
  • this requires careful operation and the adhesive tape often fails to resist a pressure of the cold setting impregnating material.
  • an expansion equipment is provided for outwardly forcing an inner surface of the repairing material to expand the repairing material.
  • the expansion equipment includes a ring formed with one cut, resulting In being provided at the cut with both ends which overlap each other and an adjustment mechanism for adjusting a width of overlap between both ends to fix both ends.
  • the casing member is formed into a sideways U-shape, resulting in including an upper wall, a lower wall and a connection wall.
  • the casing member is fixed to the one end of the ring while positioning the connection wall inside and the connection wall is provided thereon with a stopper which is contacted with the pinion to lock it.
  • the connection wall may be formed with internal threads and the stopper may be formed with external threads which are threadedly inserted into the internal threads and contacted at a distal end thereof with the pinion.
  • FIG. 1 manhole repairing materials and closing members each constructed according to the present invention is illustrated.
  • reference numerals 1 and 3 each designate a manhole repairing material made of a plastic material into a cylindrical body and formed into a thickness of about 2.0 mm.
  • the manhole repairing materials 1 and 3 are arranged so as to cover a vertical surface section 6 of an inner surface 2 of a manhole structure while being laid or superposed on each other, as shown in Fig. 3.
  • Reference numeral 9 likewise designates a manhole repairing material made of a plastic material and formed into a thickness of about 2 mm.
  • the manhole repairing material 9 includes a frust-conical section 5 provided with an upper end thereof with a cylindrical portion 4 and constituting an upper part of the manhole repairing material 9 and a short cylindrical section 7 constituting a lower part of the material 9.
  • the manhole repairing material 9 is put on the manhole repairing material 3 to cover an inclined surface section 8 of the inner surface 2 of the manhole, as shown in Fig. 3.
  • the manhole repairing materials 1, 3 and 9 are provided with vertical extending cuts 11, 13 and 15, resulting in having both ends 171 and 173, 191 and 193, and 211 and 213 defined with the cuts 11, 13 and 15 being interposed therebetween, respectively.
  • Both ends 171 and 173, 191 and 193, and 211 and 213 are arranged so as to overlap each other, so that the ends 171, 191 and 211 are positioned inside the ends 173, 193 and 213, respectively.
  • the manhole repairing materials 1, 3 and 9 are kept expanded.
  • the outer ends 173, 193 and 213 each are formed so as to outwardly expand by a width of about 100 mm in a circumferential direction of the manhole repairing material.
  • the outer ends 173, 193 and 213 are formed into an inner diameter sufficient to permit the inner ends 171, 191 and 211 to be received therein, respectively.
  • the outer ends 173, 193 and 213 each are so formed that a distance between an inner surface thereof and a center of the manhole repairing material is somewhat larger than a radius of the manhole repairing material, resulting in keeping any step or level difference from being formed inside each of the cuts 11, 13 and 15 due to the overlap.
  • the manhole repairing materials each are so formed that the overlap between the inner end and the outer end generally has a width of about 80 mm to 100 mm.
  • the manhole repairing materials each are expanded, resulting in the width of the overlap being often reduced to a level as small as about 30 mm.
  • the manhole repairing materials 1 and 3 have upper ends 23 and 25 constructed so as to be outwardly expanded, respectively, so that the upper ends 23 and 25 may be variably increased in an inner diameter so as to permit the lower end 27 of the manhole repairing material 3 and the short cylindrical section or lower end 7 of the material 9 to be received or fitted therein, respectively, to thereby keep any step or level difference from occurring on an inside of an overlap formed by superposition or laying therebetween.
  • the upper ends 23 and 25 of the manhole repairing materials 1 and 3 are also formed at a part thereof with outward expansions 29 and 31 for receiving the outer ends 193 and 213 of the materials 3 and 9 therein, respectively.
  • the manhole repairing materials 1, 3 and 9 each are provided on an outer peripheral surface thereof with a number of projections 33 and 35, respectively.
  • the projections 33 and 35 each are formed by outwardly expanding a part of a peripheral wall of each of the materials 1, 3 and 9, so that an inner peripheral surface of the material are formed with a number of recesses corresponding to the projections 33 and 35.
  • the projections 33 positioned at lower end portions 27 and 7 of the materials 3 and 9 each are integrally formed with a hook 37 for fitted superposition or laying between the manhole repairing materials.
  • the projections 33 and 35 are formed so as to outwardly project by a distance of about 6 mm and 3 mm from the outer peripheral surface of the repairing materials, respectively.
  • the projections 33 arranged on each of the outer ends 173, 193 and 213 of the materials are preferably formed so as to project by about 3 mm.
  • a gap or distance between the inner surface 2 of the manhole and each of the manhole repairing materials 1, 3 and 9 is effective to be between about 2 mm and about 10 mm.
  • a distance or height of the projections 33 may be selectively determined within a range between 2 mm and 10 mm as desired.
  • reference numerals 39, 41 and 43 each designate suspension holes through which the manhole repairing material is suspended.
  • the manhole repairing materials 1 and 3 each may be formed by subjecting fiber reinforced unsaturated polyester to molding by a hand lay up method using a die having a cylindrical outer surface and then subjecting it to rapping, followed by formation of the vertically extending cut 11 or 13. A portion of the material cut forms a distal end of the outwardly expanded portion of the material defined in a peripheral direction thereof. Formation of the manhole repairing material 9 is carried out using a die provided with a frust-conical outer surface of which an upper end is formed into a cylindrical shape and a lower end is formed into a cylindrical shape. Then, fiber reinforced unsaturated polyester is subject to molding by a hand lay up method using the die and then rapping, followed by formation of the vertically extending cut 15.
  • a portion of the material cut likewise forms a distal end of the outwardly expanded portion of the material defined in a peripheral direction thereof.
  • the dies used each have an outer surface substantially corresponding to the inner surface 2 of the manhole structure.
  • the cuts 11, 13 and 15 may be formed during the molding.
  • the manhole repairing materials 1, 3 and 9 each are made to be transparent.
  • Reference numeral 45 designates a pair of closing members made of a plastic material, each of which includes a rear plate 47 formed into a curved shape so as to correspond to a portion of the inner surface 2 of the manhole located at an opening 10 of a sewage pipe, a support bottom 49 formed so as to inwardly extend from a lower end of the rear plate 47 and a front plate 51 formed so as to upwardly extend from an inner end of the support bottom 49 and curved concentrically with the rear plate 47.
  • the rear plate 47 and front plate 51 are arranged so as to be spaced from each other with an interval of about 5 mm being defined therebetween, resulting in providing a receiving groove 53 for receiving a lower end 52 of the manhole repairing material 1. As shown in Fig.
  • a bottom surface 12 of the manhole structure is generally formed so as to be downwardly inclined from both sides thereof toward a water channel 14 formed on the bottom surface 12 so as to pass through a center of the bottom surface 12, therefore, the lower end 52 of the manhole repairing material 1 is formed in such a manner that a bottom of each of left-hand and right-hand portions 48 and 50 thereof received in the receiving groove 53 of each of the closing members 45 is horizontal. Also, the lower end 52 of the manhole repairing material 1 is so formed that a bottom of each of portions 54 thereof between the left-hand portion 48 and the right-hand portion 50 ascends from both sides thereof toward a center thereof. This permits the portions 54 to substantially conform with an outer periphery of the bottom surface 12 of the manhole.
  • the closing members 45 are arranged in the manhole structure in such a manner as shown in Fig. 3.
  • the inner surface 2 of the manhole is cleaned by blowing high-pressure water against the inner surface.
  • a rotary brush may be used for the cleaning.
  • steps 16 are cut off and then the closing members 45 are arranged at the sewage pipe openings 10, resulting in closing or the openings 10 being completed.
  • the closing members 45 are so arranged that the rear plates 47 each close an upper half of each of the sewage pipe openings 10 and the support bottoms 49 are positioned on both sides of the water channel 14 in a manner to interpose it therebetween.
  • the rear plates 47 each are formed so as to tightly close the sewage pipe opening 10 and render a curvature thereof equal to that of the inner surface 2 of the manhole. Also, it is formed into a height larger by 50 mm to 100 mm than a radius of the sewage pipe opening 10 and a width larger by 100 mm to 200 mm than a diameter of the opening 10.
  • the rear plate 47 thus formed is arranged on the inner surface 2 of the manhole with a sealing material being charged therebetween.
  • a material adapted to be cured even in the presence of water such as, for example, water-cured concrete, quick-setting mortar or the like may be preferably used as the sealing material. When a plurality of such sealing materials are used, at least one of them is desirably a water-cured type.
  • water-cured epoxy resin 55 is applied to both a portion of the inner surface 2 of the manhole around the sewage pipe openings 10 and a rear surface of the rear plates 47 and then the rear surface of the rear plates 47 is forced against the inner surface 2 of the manhole, resulting in the closing members 45 being arranged in the manhole structure.
  • water-cured epoxy resin 57 is applied to a periphery of each of the rear plates 47 to promote a sealing function.
  • the rear plates 47 each may be formed into a semi-circular shape having a radius larger by 50 mm to 100 mm than that of the sewage pipe opening 10.
  • the manhole repairing material 1 is arranged in the manhole in such a manner as shown in Fig. 5.
  • the manhole repairing material 1 is formed so as to exhibit a modulus in flexure of about 800 kg/mm 2 and tied by means of a cord, to thereby be reduced in diameter, resulting in being subject to overlapping as indicated at phantom lines in Fig. 1. Then, it is inserted through an entrance 18 of the manhole thereinto, followed by stacking or superposing operation as described hereinafter. Insertion of the manhole repairing material 1 is carried out by passing a suspension cord 59 through the suspension hole 39 of the material 1 and then downwardly moving the material 1 into the manhole as shown in Fig. 3. The manhole repairing material 1 thus inserted is then released from the overlapping, so that the lower end 52 of the material 1 is received in the receiving grooves 53 of the closing members 45 and carried on a periphery of the bottom surface 12 of the manhole.
  • an expansion equipment 61 constructed in such a manner as shown in Figs. 11 to 13 is inserted into the manhole repairing material 1 for expansion of the material 1, as shown in Fig. 3.
  • the expansion equipment 61 includes a ring 63 made of spring steel and cut at a suitable position thereof so as to provide the ring 63 with both ends 65 and 80 opposite to each other in a peripheral direction thereof and an adjustment mechanism 66 mounted on one end 65 of the ring 63.
  • the adjustment mechanism 66 includes a casing member 67, a revolving shaft 68 arranged in the casing member 67 in a manner to be rotatable and vertically extend, and a pinion 69 mounted on the revolving shaft 68
  • the casing member 67 is formed into a substantially sideways U-shape and includes an upper wall 71, a lower wall 72 and a connection wall 74 for connecting the upper and lower walls 71 and 72 to each other therethrough.
  • the upper wail 71 and lower wall 72 are fixed at an open end thereof on upper and lower portions of the one end 65 of the ring 63, respectively, resulting in the connection wall 74 being inwardly positioned.
  • the revolving shaft 68 is mounted on an upper end thereof with an adjustment section 76 of a large diameter.
  • the adjustment section 76 is positioned on the upper wall 71 of the casing member 67 and formed with a hole of a hexagonal shape which is open at an upper end thereof. Then, a hexagonal rod-like tool 78 is fitted in the hexagonal hole for operation, to thereby rotate the revolving shaft 68, leading to rotation of the pinion 69.
  • connection wall 74 of the casing member 67 is formed with a through-hole which is provided therein with internal threads 84.
  • Reference numeral 90 designates a stopper screw formed thereon with external threads 86 and provided at a rear end thereof with a ring element 88.
  • the stopper screw 90 is threadedly inserted via the through-hole.
  • the stopper screw 90 is threadedly forced into the casing member 67, to thereby be forcedly contacted with the pinion 69, leading to locking of the pinion 69, resulting in the ring 63 being kept expanded.
  • the ring 63 is mounted thereon with three suspension ring members 92.
  • the ring members 92 each are formed with a passage, through which it is slidably fitted on the ring 63.
  • the ring members 92 as shown in Fig.
  • each include a support section 98 formed into a substantially rectangular shape in section and formed with a through-hole provided with internal threads 96 and a screw 104 formed thereon with external threads 100 and provided at a rear end thereof with a ring element 102.
  • the screw 104 is threadedly inserted via the through-hole of the support member 98 into the support member 98, to thereby be forcedly abutted against the ring 63, so that the suspension ring member 92 is positioned.
  • Insertion of the expansion equipment 61 in the manhole repairing material 1, as shown in Fig. 5, is carried out in such a manner that suspension cord 77 arranged so as to extend through a plurality of or three turnbuckles 75 mounted on a suspension wire 73 is connected to the ring elements 102 of the suspension ring members 92 of the expansion equipment 61 and then the equipment 61 is downwardly moved in the manhole repairing material 1.
  • Connection of the cord 77 to the ring members 92 may be carried out by means of the ring elements 88 of the stopper screws 90.
  • the expansion equipment 61 is expanded while being suspended in the manhole repairing material 1, so that it outwardly forcedly press an inner surface of the manhole repairing material, to thereby enlarge the manhole repairing material 1, so that the ribs 33 and 35 of the manhole repairing material 1 are pressed against the vertical surface section 6 of the inner surface 2 of the manhole, as shown in Figs. 1 and 6.
  • the turnbuckles 75 are operated to render the expansion equipment 61 horizontal.
  • a chain may be substituted for the rack 80 and correspondingly a sprocket may be mounted on the revolving shaft 68 so as to be engaged with the chain.
  • the cut 11 of the manhole repairing material 1 is sealed with two-part cured silicone resin 79 and similarly a gap between the lower end of the repairing material 1 and the front plate 51 of each of the closing members 45 is sealed with two-part cured silicone resin 81. Also, a gap between the lower end of the manhole repairing material 1 and the bottom surface 12 of the manhole is sealedly closed with a sealing material, which is preferably curable even in the presence of water In the illustrated embodiment, as detailedly shown in Fig.
  • two-part cured silicone resin 83 is interposedly arranged between the lower end 52 of the manhole repairing material 1 and the bottom surface 12 of the manhole, followed by application of water-cured epoxy resin 85, and then quick-setting mortar is applied onto the water-cured epoxy resin 85.
  • the two-part cured silicone resin 83 acts to close any possible gap between the lower end 52 of the manhole repairing material 1 and the bottom surface 12 of the manhole, therefore, it is not necessarily required to arrange the resin 83 at a portion at which the lower end 52 is contacted with the bottom surface 12 of the manhole.
  • a gap 89 between the inner surface of the manhole and an outer surface of the manhole repairing material 1 is charged with a small amount of waterstop curable resin 91, so that a waterstop structure sufficient to resist a liquid pressure of an Increased level may be provided below the manhole repairing material 1.
  • the waterstop curable resin 91 may he charged so as to have a height of about 10 cm at an uppermost position on the bottom surface 12 of the manhole.
  • the waterstop structure thus constructed of the sealing materials 83, 85 and 87 and the waterstop curable resin 91 permits a cold setting impregnating material for lining which is charged in the subsequent step to be decreased in kinematic viscosity under any conditions.
  • the waterstop curable resin 91 may comprise thermosetting resin.
  • cold setting acrylic resin of 100 cSt in kinematic viscosity at 25°C may be conveniently used as the resin 91.
  • the manhole repairing materials 3 and 9 are inserted into the manhole in such a manner as shown in Fig. 9.
  • the repairing materials 3 and 9 each are likewise formed so as to exhibit a modulus in flexure of about 800 kg/mm 2 and reduced in diameter so as to be subject to overlapping.
  • the suspension cords 59 are connected to the suspension holes 41 and 43 as shown in Fig. 1 and the materials 3 and 9 are inserted into the manhole while being suspended through the cords 59 as shown in Fig. 3.
  • the manhole repairing material 3 thus inserted into the manhole is released from the overlapping, so that the lower end 27 of the material 3 is fitted in the upper end 23 of the repairing material 1.
  • the manhole repairing material 9 is inserted into the manhole structure, so that the short cylindrical section 7 is received or fitted in the upper end 25 of the manhole repairing material 5 while engaging the hocks 37 (Figs. 1 and 14) of the manhole repairing material 9 with an outside of the upper end 25 of the manhole repairing material 3, resulting in stacking or superposition between the manhole repairing materials 3 and 9 being completed.
  • the expansion equipment 61 is operated to enlarge the manhole repairing material 9 to forcedly press the ribs 33 against the inclined surface section 8 of the inner surface 2 of the manhole and an upper portion of the vertical surface section 6 thereof, resulting in expansion of the material 9 being completed.
  • the expansion equipment 61 for enlargement of the manhole repairing material 9 is preferably constructed so that an outer surface thereof is inclined in correspondence to the repairing material 9.
  • the expansion equipment 61 may be so constructed that no inclined outer surface is provided on each of the cylindrical portion 4 and short cylindrical section 7 thereof, as shown in Fig. 10.
  • the cut 15 and a superposition region 99 between the materials 3 and 9 are sealed with two-part cured silicone resin, resulting in arrangement of the manhole repairing materials 1, 3 and 9 being completed.
  • the operation for superposition by fitting is carried out so that the cuts 13 and 15 are conformed with the outer expansions 29 and 31 (Fig. 1), respectively.
  • the released paper 103 is removed from the adhesive layer 105 and the lower end 27 of the manhole repairing material 3 and the short cylindrical section 7 of the repairing material 89 are pressed against the adhesive layer 105, to thereby be adhered thereto, resulting in the operation for superposition being readily and conveniently accomplished.
  • the outer ends 173, 193 and 213 of the vertically extending cuts 11, 13 and 15 each may likewise have an adhesive layer 109 provided thereon while being covered with a released paper 107, to thereby ensure adhesion between the outer ends 173, 193 and 213 and the inner ends 171, 191 and 211 during the expansion, so that the manhole repairing materials 1, 3 and 9 may be kept uniformly expanded.
  • leakage preventing sponges 111 and 113 are preferably arranged on upper and outer sides of the cuts, respectively, as shown in Figs. 14 and 15. Outer expansion of the upper ends 23 and 25 and outer ends 173, 193 and 213 may be set to be about 2 mm.
  • the expansion may be set to be in the order of 3 mm.
  • the projections 35 and the projections 33 on the outer ends 173, 193 and 213 each may he formed into a height of about 4 mm when the adhesive layers 105 and 109 are not arranged.
  • a cold setting impregnating material 115 for lining is downwardly charged throughout the gap 89 between the repairing materials 1, 3 and 9 and the inner surface 2 of the manhole, to thereby carry out lining.
  • a liquid rubber material such as liquid urethane resin, polybutadiene or the like may be used as the impregnating material 115.
  • cold setting epoxy resin, acrylic resin or unsaturated polyester resin which is inexpensive and exhibits good adhesion properties may be suitably used for this purpose
  • thermosetting resin may be used as required.
  • water glass or cement milk may he selectively used.
  • cold setting epoxy resin of 300 cSt in kinematic viscosity at 25°C is used to this end.
  • the cold setting impregnating resin 115 for lining preferably has kinematic viscosity of 3000 cSt or less at 25°C. Particularly preferably, the kinematic viscosity at 25°C is between 100 cSt and 500 cSt.
  • a period of time required for curing conventional cold setting resin is generally in the order of 1 to 6 hours. Therefore, it is preferable that charging of the cold setting impregnating material 115 after setting or arrangement of the manhole repairing materials 1, 3 and 9 in the manhole is carried out at one time in order to reduce a period of time required for the repairing.
  • the charging may be carried out in several times, wherein each charging takes place after the cold setting impregnating material 115 charged by the preceding charging operation is cured or semi-cured. Also, the charging may take place every time when setting of each of the manhole repairing materials 1, 3 and 9 is carried out.
  • the cold setting impregnating material 115 is cured, the expansion equipments are removed from the repairing materials, followed by formation of holes 117 at the sewage pipe openings 10 and arrangement of new steps (not shown). Then, the holes 117 are covered on a cut surface thereof with curable resin such as epoxy resin or the like, resulting in an appearance of the manhole being finished. Thus, the repairing operation is completed.
  • the cold setting impregnating material 115 as shown in Fig. 18, is fully impregnated into any corroded and/or cracked portion of the inner surface 2 of the manhole and cured.
  • the lining layer is formed of only cold setting impregnating material 115 while keeping the manhole repairing materials 1, 3 and 9 removed from the manhole, a released material is applied to the outer surface of the repairing materials.
  • the repairing materials are made of resin exhibiting satisfactory release characteristics such as polypropylene, polyethylene, fluororesin or the like, application of a released material thereto is eliminated.
  • FIG. 19 another embodiment of a manhole surface repairing method according to the present invention is illustrated.
  • an elongated repairing material 119 of a cylindrical shape and a frust-conical repairing material 121 is substituted for the manhole repairing materials 1, 3 and 9 in the embodiment described above.
  • the cylindrical repairing material 119 and frust-conical repairing material 121 are formed with vertically extending cuts 123 and 125, respectively.
  • the repairing materials 119 and 121 are formed on an outer surface thereof with projections 127 for formation of a gap.
  • the projections 127 are arranged so as to vertically extend from an upper end of each of the repairing materials 119 and 121 to a lower end thereof and be spaced from each other at equal intervals in a circumferential direction of the repairing material.
  • the frust-conical repairing material 121 may be provided on an upper end thereof with a cylindrical portion.
  • the repairing material 119 is so constructed that a lower end 129 thereof has a left-hand portion 131 and a right-hand portion (not shown) defined on a horizontal plane.
  • the lower end 129 has intermediate portions 133 defined between the left-hand portion 131 and the right-hand portion, each of which is farmed so as to be gradually raised from both sides thereof toward a center thereof.
  • the intermediate portions 133 are formed so as to be conformed with a periphery of a bottom surface 12 of the manhole.
  • the remaining part of the illustrated embodiment may be constructed in substantially the same manner as the embodiment described above.
  • an expansion equipment which is adapted to outwardly force an inner surface of a repairing material structure to expand the repairing material structure.
  • the expansion equipment includes a ring formed with one cut, resulting in being provided at the cut with one end and the other end which overlap each other in a circumferential direction of the ring and an adjustment mechanism mounted on the one end of the ring.
  • the adjustment mechanism includes a casing member, a revolving shaft arranged in the casing member so as to be rotatable and extend through the casing member, and a pinion securely mounted on the revolving shaft and arranged in the casing member.
  • the other end of the ring is inserted between the casing member and the one end of the ring and provided on an inside thereof with a rack adapted to be engaged with the pinion.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
EP96309422A 1996-12-20 1996-12-20 Procédé de réparation de la face intérieure d'un trou d'homme Withdrawn EP0849404A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96309422A EP0849404A1 (fr) 1996-12-20 1996-12-20 Procédé de réparation de la face intérieure d'un trou d'homme

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EP96309422A EP0849404A1 (fr) 1996-12-20 1996-12-20 Procédé de réparation de la face intérieure d'un trou d'homme

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2218830A3 (fr) * 2009-02-17 2013-03-13 Paul Harvey Réparations de regard
CN104947785A (zh) * 2015-06-29 2015-09-30 张金荣 一种磁吸式地漏

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429526A (en) 1987-07-24 1989-01-31 Osaka Bosui Kensetsusha Kk Water-proofing work for manhole
JPS6443623A (en) 1987-08-10 1989-02-15 Osaka Bosui Kensetsusha Kk Water-proofing work of manhole
JPH01198325A (ja) 1988-02-03 1989-08-09 Toubu Kuriinaa Service:Kk マンホールの補修工法
US5017313A (en) * 1988-09-02 1991-05-21 Action Products Marketing Corporation Method and means for repairing existing manhole
WO1991015634A1 (fr) * 1990-03-30 1991-10-17 Oy Kwh Pipe Ab Procede de renovation de puits
JPH05301238A (ja) 1992-04-28 1993-11-16 Tsutsunaka Plast Ind Co Ltd 下水道の既設人孔補修用ライニング材の製造法
JPH0827822A (ja) * 1994-07-15 1996-01-30 Tokai Rubber Ind Ltd マンホール補修方法及びマンホール補修材
WO1996005378A1 (fr) * 1994-08-09 1996-02-22 Kjeld Povl Nielsen Procede de revetement d'un puits ou d'une conduite et anneau de support utilise dans la mise en ×uvre du procede
JPH08158389A (ja) * 1994-12-01 1996-06-18 Tsutsunaka Plast Ind Co Ltd 下水道の既設人孔補修用ライニング材

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429526A (en) 1987-07-24 1989-01-31 Osaka Bosui Kensetsusha Kk Water-proofing work for manhole
JPS6443623A (en) 1987-08-10 1989-02-15 Osaka Bosui Kensetsusha Kk Water-proofing work of manhole
JPH01198325A (ja) 1988-02-03 1989-08-09 Toubu Kuriinaa Service:Kk マンホールの補修工法
US5017313A (en) * 1988-09-02 1991-05-21 Action Products Marketing Corporation Method and means for repairing existing manhole
WO1991015634A1 (fr) * 1990-03-30 1991-10-17 Oy Kwh Pipe Ab Procede de renovation de puits
JPH05301238A (ja) 1992-04-28 1993-11-16 Tsutsunaka Plast Ind Co Ltd 下水道の既設人孔補修用ライニング材の製造法
JPH0827822A (ja) * 1994-07-15 1996-01-30 Tokai Rubber Ind Ltd マンホール補修方法及びマンホール補修材
WO1996005378A1 (fr) * 1994-08-09 1996-02-22 Kjeld Povl Nielsen Procede de revetement d'un puits ou d'une conduite et anneau de support utilise dans la mise en ×uvre du procede
JPH08158389A (ja) * 1994-12-01 1996-06-18 Tsutsunaka Plast Ind Co Ltd 下水道の既設人孔補修用ライニング材

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 096, no. 005 31 May 1996 (1996-05-31) *
PATENT ABSTRACTS OF JAPAN vol. 096, no. 010 31 October 1996 (1996-10-31) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2218830A3 (fr) * 2009-02-17 2013-03-13 Paul Harvey Réparations de regard
CN104947785A (zh) * 2015-06-29 2015-09-30 张金荣 一种磁吸式地漏
CN104947785B (zh) * 2015-06-29 2016-06-08 冯涛 一种磁吸式地漏

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