EP0663477A1 - Matériau lubrifiant pour l'extraction d'une structure temporairement enterrée - Google Patents

Matériau lubrifiant pour l'extraction d'une structure temporairement enterrée Download PDF

Info

Publication number
EP0663477A1
EP0663477A1 EP95300228A EP95300228A EP0663477A1 EP 0663477 A1 EP0663477 A1 EP 0663477A1 EP 95300228 A EP95300228 A EP 95300228A EP 95300228 A EP95300228 A EP 95300228A EP 0663477 A1 EP0663477 A1 EP 0663477A1
Authority
EP
European Patent Office
Prior art keywords
water
lubricating material
absorbent polymer
reinforcement
extraction
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Withdrawn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
EP95300228A
Other languages
German (de)
English (en)
Inventor
Koichi Heights Azelea 102 Okamoto
Nobuyuki Harada
Toshiaki Nakamura
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.)
Nippon Shokubai Co Ltd
Original Assignee
Nippon Shokubai 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 Nippon Shokubai Co Ltd filed Critical Nippon Shokubai Co Ltd
Publication of EP0663477A1 publication Critical patent/EP0663477A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
    • E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers

Definitions

  • This invention relates to a lubricating material for the extraction of a temporarily buried reinforcement. More particularly, it relates to a lubricating material for the extraction of a temporarily buried reinforcement, which lubricating material is used, after a temporarily buried reinforcement such as, for example, a pile such as a steel H pile, or a steel sheet pile driven into hardening hydrate such as cement or soft ground has discharged its function, for the purpose of imparting lubricity to the interface between the temporarily buried reinforcement and the ground thereby facilitating the extraction of the temporarily buried reinforcement from the ground.
  • a temporarily buried reinforcement such as, for example, a pile such as a steel H pile, or a steel sheet pile driven into hardening hydrate such as cement or soft ground has discharged its function, for the purpose of imparting lubricity to the interface between the temporarily buried reinforcement and the ground thereby facilitating the extraction of the temporarily buried reinforcement from the ground.
  • the so-called peristylar soil cement continuous wall method is counted among the methods which have been recently in popular use in the construction or the foundation of multi-story buildings, river banks, underground structures, etc.
  • This method comprises excavating the boundary of a site for construction and filling the excavated boundary with soil cement thereby erecting a soil cement wall intended to hold back the hydraulic pressure of soil. Since this wall of soil cement is deficient in strength as compared with ordinary concrete, such temporary reinforcements as steel H piles are incorporated in the soil cement layer. Also in the work of reinforcing an excavation, piles like steel H piles are buried in a cementitious substance and a concrete wall is erected as supported by the steel H pile-reinforced cementitious substance.
  • the temporary reinforcements like steel H piles which have been driven into the cement layer have too high adhesiveness to the hardened cement to be easily extracted from the hardened cement. Thus, it has been customary for these reinforcements to be left buried in the cement after the work of reinforcement has been completed.
  • the steel materials which have been used as temporarily buried reinforcements are not always found to be necessary from the standpoint of strength after the cement has been hardened.
  • the used steel materials which have played their part as temporarily buried reinforcements in the work are extracted from the hardened cement layer and put to use again, they ought to contribute enormous to economize the work.
  • This practice of reclaiming the used steel materials has the advantage of facilitating such secondary works as the expansion and the remodeling of existing buildings and the construction of sewerage systems and water supply systems.
  • JP-A-58-104,058 proposes a method which comprises applying an organic substance containing wax or sugar to the surface of a given temporarily buried reinforcement and putting the coated reinforcement to use.
  • This method when using wax in the organic coating substance, requires the wax to be melted by heating and consequently betrays deficiency in quickness and efficiency of the work to be involved.
  • the method when using sugar instead, is not necessarily a wise choice because the effect of preventing the hardening of cement possibly expands to the inner part of the mass of cement and eventually impairs the strength of the cement mass.
  • JP-B-04-44,045 discloses a method which facilitates the extraction of a temporarily buried reinforcement by preparatorily applying to the entire surface of this reinforcement an absorbent lubricating tape having an water-absorbent polymer fixed thereon with such a rewetting binder as starch paste.
  • JP-A-01-58,715 discloses a method which resides in directly coating to a core member a surface treating agent which is composed of a water-absorbent polymer and an extender at a prescribed weight ratio.
  • this method has not produced a satisfactory result because it still entails a troublesome work and has not perfectly solved the two problems, i.e. accidental separation of the water-absorbent polymer and the degradation of the capacity for absorption by the extender. Moreover, this method necessitates the addition of a solvent for the dispersion of an extender in the coating material with a sacrifice of the safety of the working environment.
  • the temporarily buried reinforcements according to the conventional methods may be extracted and put to use again, the temporarily buried reinforcements which have been extracted from the cement layer must be stripped of either the water-absorbent polymer or the adhesive agent still adhering to their surfaces and then coated anew with a lubricating tape or a surface treating agent.
  • the conventional methods prove to be troublesome and uneconomical.
  • An object of this invention is to provide a novel lubricating agent for the extraction of temporarily buried reinforcements.
  • Another object of this invention is to provide a lubricating material for the extraction of temporarily buried reinforcement, which lubricating material excels in applicability to a substrate at the site of construction, allows the temporarily buried reinforcements using it to be easily extracted from the cement layer, recovered, and put to use again after the construction is completed, and proves to be highly economical.
  • a lubricating material for the extraction of temporarily buried reinforcements which lubricating material is characterized by being provided with a water-absorbent polymer sheet layer having a water-absorbent polymer directly deposited fast on a substrate.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, wherein the water-absorbent polymer has been obtained by polymerizing a water-soluble ethylenically unsaturated monomer capable of being converted by polymerization into a water-absorbent polymer on the substrate.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, wherein the substrate is a porous material.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, wherein the amount of the water-absorbent polymer is in the range of from 10 to 1000 parts by weight, based on 100 parts by weight of the substrate.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, wherein the porous material is a fibrous material or sponge.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, wherein a thickness of said lubricating material is in the range of from 10 to 1000 ⁇ m.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, wherein the water-absorbent polymer has been obtained by polymerizing a monomer having as a main component thereof at least one water-soluble ethylenically unsaturated monomer selected from the group consisting of (meth)acrylic acid, (meth)acrylic acid salts, sulfonic acid group-containing (meth)acrylic esters and salts thereof, and 2-(meth)acrylamide-2-methylpropane sulfonic acid and salts thereof.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, wherein the water-absorbent polymer contains a sulfonic acid group obtained by polymerizing a water-soluble unsaturated monomer containing a water-soluble ethylenically unsaturated monomer.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, wherein the water-soluble ethylenically unsaturated monomer contains a cross-linking agent in an amount in the range of from 0.001 to 10 mol%, based on the amount of the monomer.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, which is further provided on one side of the water-absorbent polymer sheet layer with a water-impermeable layer.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, wherein a thickness of the water-impermeable layer is in the range of 1 to 1000 ⁇ m.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, which is in the shape of a bag or a tube.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, which is further provided with a water-impemeable layer on the inner side of the water-absorbent polymer layer in the shape of a bag or a tube.
  • This invention further concerns the lubricating material for the extraction of the temporarily buried reinforcements, which is further provided at the opening part of the bag or the tube with a hanger.
  • the lubricating material of this invention for the extraction of the temporarily buried reinforcements is used to cover the surface of the temporary reinforcement such as the pile of an steel H pile or the steel sheet pile of a flat steel plate which is destined to hold back the hardening hydrate such as the soft ground of silt or sludge or the cement before the reinforcement is placed in the silt or the cement.
  • the temporarily buried reinforcement is no longer useful and is extracted from the silt or the cement.
  • the extraction of the temporarily buried reinforcement therefore, is facilitated by the fact that the lubricating material is used on the steel H pile or the steel sheet pile.
  • the lubricating material of this invention for the extraction of the temporarily buried reinforcements permits lasting preclusion of the accidental separation of the polymer, enjoys a high lubricating property, facilitates saliently the extraction and recovery of the buried reinforcements from the cement layer, and contributes to economize the use of the temporary reinforcements. It also contributes to improve the efficiency of the work of handling at the site of construction, the secondary work, or the work of recovering the buried reinforcements and putting it to use again.
  • the lubricating material for the extraction of the temporarily buried reinforcements of this invention therefore, can be used as a material for facilitating the recovery of such temporary reinforcements as the steel H piles and the steel sheet piles from the cement layers and the soft grounds which are formed in various foundation works for multi-story buildings, expressways, bridges, river banks, lakes, waterfronts, and ports and harbors, various underground works for underground cities, subways, ground surfaces, sewerages, city water pipes, gas pipes, and electric wirings, and works for excavation.
  • the lubricating material for the extraction of temporary reinforcements is formed in the shape of a bag or a tube, it facilitates the work of placing such temporary reinforcements as the steel H piles and the steel sheet piles.
  • a layer impermeable to water is provided on one side of the water-absorbent polymer or inside the bag or the tube of the lubricating material, it keeps the cement milk from permeating the buried reinforcement and prevents the buried reinforcement from gathering stain.
  • Fig. 1 is a cross section illustrating one embodiment of the lubricating material of this invention for the extraction of temporarily buried reinforcements.
  • Fig. 2 is a cross section illustrating another embodiment of the lubricating material of this invention for the extraction of temporarily buried reinforcements.
  • Fig. 3 is a diagram illustrating the manner in which an steel H pile is in the process of being inserted into a lubricating material for the extraction of a temporary reinforcement fabricated in the shape of a bellows and posed for insertion into a mass of cement.
  • Fig. 4 is a diagram illustrating one embodiment of the disposition in a steel H pile of the lubricating material of this invention for the extraction of a temporarily buried reinforcement.
  • Fig. 5 is a diagram illustrating another embodiment of the disposition in a steel H pile of the lubricating material of this invention for the extraction of a temporarily buried reinforcement.
  • Fig. 6 is a diagram illustrating still another embodiment of the disposition in a steel H pile of the lubricating material of this invention for the extraction of a temporarily buried reinforcement.
  • Fig. 7 is a diagram illustrating yet another embodiment of the disposition in a steel H pile of the lubricating material of this invention for the extraction of a temporarily buried reinforcement.
  • Fig. 8 is a diagram illustrating the state in which the lubricating material for the extraction of temporary reinforcement has been fixed on a steel H pile.
  • a lubricating material 1 of this invention which is provided with a water-absorbent polymer sheet layer and adapted for the extraction of a temporarily buried reinforcement is furnished with a water-absorbent polymer sheet layer 3 having a water-absorbent polymer directly deposited fast on a substrate 2 without use of a binder.
  • the water-absorbent polymer layer can be interposed between the temporary reinforcement and the cement layer without either sacrificing the absorbing property inherent in the water-absorbent polymer or entailing accidental separation of the water-absorbent polymer and can be used as a lubricating material for the extraction of the temporarily buried reinforcement.
  • Fig. 2 illustrates another preferred embodiment of this invention. It is a lubricating material 11 for the extraction of a temporarily buried reinforcement having a water-absorbent polymer sheet layer 13 formed on a substrate 12 without use of a binder and having a layer 14 impermeable to water deposited on one side of the water-absorbent polymer sheet layer 13.
  • the water-absorbent polymer which is advantageously used in the present invention is obtained by polymerizing a water-soluble ethylenically unsaturated monomer having as a main component thereof acrylic acid, an acrylate, or a sulfonic acid group-containing (meth)acrylic ester or an acid thereof and optionally incorporating therein a crosslinking agent and consequently adapted to swell by absorbing from 10 to 1000 times its own weight of water.
  • a thickness of the substrate is not limited, it is generally in the range of 0.01 to 10mm, and a basis weight thereof is in the range of 10 to 500g/m2.
  • cross-linked polyethylene oxide cross-linked polyvinylpyrrolidone, sulfonated crosslinked polystyrene, cross-linked polyvinyl pyridine, saponified starch-poly(meth)-acrylonitrile graft copolymer, cross-linked starch-poly(meth)-acrylic acid (acrylate) graft copolymer, the reaction product of polyvinyl alcohol with maleic anhydride (salt), cross-linked polyvinyl alcohol sulfonates, and polyvinyl alcohol-acrylic acid graft copolymer may be cited.
  • hydrophilic or hydrophobic porous materials such as woven fabrics, non-woven fabrics, knit fabrics, paper, and sponge may be cited.
  • the fact that the substrate contains voids therein is at an advantage in enabling the water-absorbent polymer to acquire empty spaces available for the purpose of swelling and ensuring effective contact between the cement water and the water-absorbent polymer.
  • hydrophilic fibers such as of wood pulp, cotton, wool, rayon, acetate, and vinylon and hydrophobic fibers such as of polyester, polyacrylonitrile, nylon, polypropylene, polyethylene, polyurethane, polyvinyl chloride, glass wool, and rock wool
  • the substrate is a fibrous substrate.
  • the substrate is a spongy substance, polyacetal, polyurethane, cellulose, and phenol resin may be cited as concrete examples of the raw material usable therefor.
  • the substrate From the viewpoint of the workability, flexibility, and economy of the lubricating material to be produced and used for the extraction of the temporarily buried reinforcement, it is particularly desirable to use for the substrate the non-woven fabric of hydrophobic fibers of polyester or polypropylene among other raw materials mentioned above.
  • the amount of the water-absorbent polymer is in the range of from 10 to 1000 parts by weight, preferably from 80 to 500 parts by weight, based on 100 parts by weight of the substrate. If the amount of the water-absorbent polymer is less than 10 parts by weight, the disadvantage will arise that the water-absorbent polymer manifests an unduly small lubricating effect for the sake of the extraction of the temporarily buried reinforcement. Conversely, if this amount exceeds 1000 parts by weight, the disadvantage will arise that the produced water-absorbent polymer sheet acquires unduly low flexibility and suffers from deficiency in workability.
  • the water-absorbent polymer sheet which has the water-absorbent polymer directly deposited fast on the substrate is obtained by a) a method which comprises directly spraying on the substrate the water-absorbent polymer softened in advance with water and optionally drying the applied layer of the water-absorbent polymer, B) a method which comprises applying to the substrate a water-soluble polymer capable of being converted by cross-linking into the water-absorbent polymer and then cross-linking the applied layer of the water-soluble polymer, or C) a method which comprises applying to the substrate a monomer capable of being converted by polymerization into the water-absorbent polymer and then polymerizing the applied layer of the monomer, for example.
  • the method to be adopted for this production of the water-absorbent polymer sheet has no particular restriction except for the requirement that it be capable of directly depositing the water-absorbent polymer fast on the substrate through no medium of a binder.
  • the method which comprises applying to the substrate a monomer capable of being converted by polymerization into the water-absorbent polymer and subsequently polymerizing the applied layer of the monomer proves to be particularly desirable from the viewpoint of the convenience and the economy of manufacture and the durability of the produced water-absorbent polymer sheet.
  • the water-absorbent polymer sheet which has the water-absorbent polymer directly deposited fast on the substrate can be easily and conveniently obtained.
  • acrylic acid and methacrylic acid and alkali metal salts and ammonium salts thereof As typical examples of the monomer which can be converted by polymerization into the water-absorbent polymer, acrylic acid and methacrylic acid and alkali metal salts and ammonium salts thereof; 2-(meth)acryloylethanesulfonic acid, 2-(meth)acryloyl propanesulfonic acid, 2-(meth)acrylamide-2-methylpropanesulfonic acid, vinylsulfonic acid, (meth)allylsulfonic acid and alkali metal salts and ammonium salts thereof; (meth)acrylamide, N,N'-dimethylaminoethyl(meth)acrylates and quaternization products thereof; and hydroxyalkyl(meth)acrylates and polyalkylene glycol (meth)acrylates may be cited. These monomers may be used either singly or in the form of a mixture of two or more members.
  • sulfonic acid group-containing water-soluble ethylenically unsaturated monomers as 2-(meth)acryloylethanesulfonic acid, 2-(meth)-acryloylpropanesulfonic acid, 2-(meth)acrylamide-2-methyl propanesulfonic acid, vinylsulfonic acid, (meth)allylsulfonic acid, and alkali metal salts and ammonium salts thereof prove to be particularly preferable.
  • the lubricating material of this invention for the extraction of a temporarily buried reinforcement which is formed of the water-absorbent polymer sheet obtained by depositing the sulfonic acid group-containing water-soluble ethylenically unsaturated monomer on the substrate and consequently polymerizing or cross-linking the applied layer of the monomer succumbs only sparingly to the influence of the polyvalent metal salt such as calcium salt contained in the cement water and pH, and, therefore, enjoys a stable ability to swell by absorbing the cement water, and further facilitates the extraction of a temporarily buried reinforcement.
  • the monomer mentioned above may have incorporated therein a polyfunctional water-soluble ethylenically unsaturated monomer as a cross-linking agent.
  • a polyfunctional water-soluble ethylenically unsaturated monomer as a cross-linking agent.
  • the monomer which is usable as the cross-linking agent divinyl benzene, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, trimethylol propane tri(meth)acrylate, pentaerythritol (meth)acrylate, pentaerythritol di(meth)acrylate, N,N-methylenebisacrylamide, triallyl isocyanurate, and trimethylol propane diallyl ether may be cited.
  • this cross-linking agent contributes to improve the durability and the shape-retaining property of the produced lubricating material.
  • the amount of the crosslinking agent to be used may be suitably selected in accordance with the kind of the monomer and the conditions for the polymerization of this monomer, it is generally in the range of from 0.001 to 10 mol%, preferably from 0.01 to 5 mol% (based on the amount of the monomer).
  • the method for effecting the deposition of the monomer mentioned above on the substrate has no particular restriction.
  • This deposition of the monomer on the substrate can be attained, for example, by preparing the monomer in the form of an aqueous solution, depositing the aqueous solution on the substrate by printing, spraying, or impregnating the substrate with the monomer solution followed by squeezing off to a specified amount.
  • the monomer which has been deposited on the substrate as described above is polymerized by the known technique to accomplish the direct deposition of the water-absorbent polymer on the substrate.
  • This polymerization can be effected by any of the known methods which resort to the actions of heat, light, electron beam, ultraviolet light, etc.
  • the aqueous solution of the monomer mentioned above may additionally contain therein a water-soluble radical polymerization initiator such as persulfate, a water-soluble amino compound, etc. or other additives as occasion demands.
  • the lubricating material of this invention for the extraction of a temporarily buried reinforcement which is formed as described above has a thickness in the range of from 10 to 1000 ⁇ m, preferably from 20 to 500 ⁇ m. If this thickness is less than 10 ⁇ m, the lubricating material will be deficient not only in mechanical strength but also in the ability to absorb water and the lubricity necessary for the extraction of the temporarily buried reinforcement. Conversely, if this thickness exceeds 1000 ⁇ m, the lubricating material sometimes lacks flexibility and it is sometimes difficult to attach the lubricating material on the surface of the temporarily buried rein for cement.
  • the lubricating material of this invention which is provided with the water-absorbent polymer sheet layer obtainable as described above and is used for the extraction of a temporarily buried reinforcement has the water-absorbent polymer directly deposited fast on the substrate as described above.
  • the swelling of the water-absorbent polymer with the cement water, or the extraction of the buried reinforcement from the hardened cement layer therefore, the accidental separation of the water-absorbent polymer occurs very rarely.
  • the water-absorbent polymer is deposited uniformly throughout the entire surface of the temporarily buried reinforcement.
  • the lubricating material of this invention therefore, manifests extremely high lubricity during the extraction of the temporarily buried reinforcement.
  • the lubricating material of this invention for the extraction of the temporarily buried reinforcement is allowed to exhibit a high swelling property because it avoids using such a binder as impedes the water-absorbent polymer from swelling by absorption in the fast deposition of the water-absorbent polymer on the substrate.
  • the use of the lubricating material of this invention therefore, allows a large gap to be formed between the temporarily buried reinforcement and the cement layer and aids in decreasing the frictional resistance generated during the extraction of the temporarily buried reinforcement.
  • the lubricating material facilitates the extraction of the temporarily buried reinforcement to a greater extent.
  • the material for the water-impermeable layer has no particular restriction except for the requirement that it be impermeable to water and capable of being applied fast to the water-absorbent polymer sheet layer mentioned above.
  • hydrophobic resinous films and boards such as of polyester, polyacrylonitrile, nylon, polypropylene, polyethylene, polyvinyl chloride, and polyurethane; aluminum foil; and metallic films such as of aluminum may be cited.
  • the resinous film layers such as of polyester, polyacrylonitrile, nylon, polypropylene, polyethylene, polyvinyl chloride, and polyurethane prove to be particularly desirable from the viewpoint of the flexibility, workability, and economy of the water-absorbent polymer sheet provided with the layer impermeable to water.
  • the water-impermeable layer has a thickness in the range of from 1 to 1000 ⁇ m, preferably from 10 to 500 ⁇ m.
  • the fast attachment of the material impermeable to water to one side of the water-absorbent polymer sheet layer mentioned above can be attained by a method which effects the attachment through the medium of a binding agent such as a tackiness agent or an adhesive agent or a method which attains the attachment by preparing the material under consideration in a thermally molten state, extruding the thermally molten material, and applying the extruded molten material to the one side, for example.
  • the method which attains the application by the extrusion of the thermally molten material proves to be preferable from the viewpoint of the efficiency of manufacture, flexibility, workability, and economy of the lubricating material.
  • the lubricating material which is provided with the water-impermeable layer When the lubricating material which is provided with the water-impermeable layer is to be deposited on the surface of a given temporary reinforcement, it ought to be attached to the surface in such a manner that the water-impermeable layer may fall on the temporary reinforcement side and the water-absorbent polymer layer may fall on the cement layer side.
  • the water-impermeable layer which is used in the lubricating material as deposited on one side of the water-absorbent polymer sheet layer prevents the cement still in a fluid state from passing to the temporary reinforcement side, ensures perfect separation of the cement layer from the temporary reinforcement, and allows the temporarily buried reinforcement to be easily extracted and recovered.
  • the reinforcement so recovered can be put to use again in its unmodified form because neither cement adheres to nor rust forms on the surface of the recovered reinforcement.
  • a lubricant such as wax or a rust preventive may be preparatorily applied to the surface of the temporary reinforcement.
  • the lubricating material of this invention for the extraction of the temporarily buried reinforcement is disposed on the surface of a given temporary reinforcement before this temporary reinforcement is driven into a hardening hydrate such as cement.
  • the disposition of the lubricating material on the surface of the temporary reinforcement may be attained by such a method as wrapping the temporary reinforcement with the lubricating material or nipping it between the opposed pieces of the lubricating material, for example.
  • the lubricating material may be fastened to the temporary reinforcement with bolts or attached fast thereto with a varying adhesive agent.
  • the method of fabricating the lubricating material for the extraction of the temporarily buried reinforcement in the form of a bag and wrapping a given temporary reinforcement with the bag proves to be particularly preferable.
  • the lubricating material thus fabricated in the form of a bag can be easily disposed on the surface of such a large and heavy temporary reinforcement as a steel H pile.
  • the lubricating material which has been fabricated in the form of a bag is preferable further to be corrugated.
  • the corrugated lubricating material is at an advantage in acquiring a compact shape, avoiding to occupy a large space at the site of construction, and ensuring easy disposition on the temporary reinforcement.
  • the lubricating material for the extraction of the temporarily buried reinforcement may be disposed on a given temporary reinforcement in advance of the transportation of the temporary reinforcement to the site of construction. Preferably, it is disposed on the temporary reinforcement at the site of construction in advance of the placement of the temporary reinforcement in the cement.
  • the method to be adopted for the disposition of the lubricating material on the temporary reinforcement at the site of construction has no particular restriction. Figs. 3 to 5 depict typical examples of the method available for this purpose. Fig.
  • FIG. 3 represents the method which comprises setting a corrugated lubricating material 21 for the extraction of a temporarily buried reinforcement on a supporting base 25 and inserting a steel H pile 22 downward (in the direction of A) into the corrugated bag of the lubricating material 21 and, at the same time, driving the steel H pile into a soil cement 23 which fills a hole excavated in the ground.
  • the corrugated bag of the lubricating material 21 is lined, when necessary, with a polypropylene water-impermeable layer (not shown).
  • the bag has the bottom thereof heat sealed so as to prevent the cement 23 in a fluid state to permeate the lubricating material 21 and contact the steel H pile 22.
  • the lubricating material 21 for the extraction of the temporarily buried reinforcement illustrated in Fig. 3 is fabricated in the shape of a corrugated bag, it avoids occupying an unduly large space and can be disposed on the surface of the steel H pile 22 by a simple work of inserting the H bar 22 downward into the bag.
  • Fig. 4 represents the method which comprises slipping the corrugated lubricating material 21 for the extraction of the temporarily buried reinforcement on one end of the steel H pile 22, then lifting the steel H pile 22 as with a crane 27, and subsequently causing the lubricating material 21 to be pulled down with a cord 28 handled by a human being 29 thereby completing the disposition of the lubricating material 21 on the surface of the steel H pile 22.
  • the lubricating material 21 for the extraction of the temporarily buried reinforcement may be lined with a layer impermeable to water or the bag of the lubricating material 21 may have the lower end thereof heat sealed.
  • Fig. 5 represents the method which comprises keeping the steel H pile 22 suspended as by a crane 27 and lifting the bag-shaped lubricating material 21 with the cord 28 through the medium of a pulley 30 until the steel H pile 22 is completely covered with the bag.
  • the bag when necessary for preventing the cement in a fluid state from contacting the steel H pile 22, may be lined with a water impermeable layer (not shown).
  • the cord 28 is attached at one end thereof to the upper part of the bag and passed around the pulley 30 fixed to the leading end of the crane 27. It is pulled up with the force of the human being 29 until the bag completely envelopes the steel H pile 22.
  • the bag of the lubricating material 21 After the bag of the lubricating material 21 has been pulled up completely, it is cut in a suitable length and the lower cut end of the bag is sealed with an adhesive agent or by heat sealing so as to prevent the cement in a fluid state from entering the bag through the lower cut end.
  • the lower cut end of the bag may be tied as with a cord to preclude the otherwise possible invasion of the bag interior by the fluid cement.
  • the disposition of the lubricating material 21 for the extraction of the temporarily buried reinforcement on the surface of the steel H pile 22 can be easily attained. It should be noted that they are not the only methods that are available for the disposition of the lubricating material for the extraction of the temporarily buried reinforcement on the surface of the temporary reinforcement.
  • Fig. 6 represents another example of the method available for the attachment of the lubricating material 21 for the extraction of the temporarily buried reinforcement to the steel H pile 22 which is a temporary reinforcement.
  • This method comprises setting the lubricating material 21 for the extraction of the temporarily buried reinforcement in place as posed in the shape of a folded bag or tube, inserting the steel H pile 22 into an opening end 31 of the bag or tube, and giving a pull at the cord 28 thereby lifting the opening end 3 until the bag or tube wraps the steel H pile 22 completely.
  • Fig. 7 and Fig. 8 represent other examples of the method available for the attachment under consideration. These methods have in common the procedure which comprises attaching a hanger 33 through the medium of a cord 32 to the opening end 31 of the lubricating material 21 for the extraction of the temporarily buried reinforcement fabricated in the shape of a bag or a tube, inserting the steel H pile 22 into the opening end 31 of the lubricating material 21, giving a pull at the cord 28 thereby lifting the opening end 31 together with the hanger 33 and causing the lubricating material 21 for the extraction of the temporarily buried reinforcement to ascend along the lateral face of the steel H pile 22, and discontinuing the pull of the cord 28 after the opening end 31 reaches a level slightly above the upper end of the steel H pile 22 thereby allowing the hanger 33 to fall and settle on the upper end of the steel H pile 22.
  • the necessity for particularly fixing the lubricating material 11 during the subsequent work of insertion into the cement can be obviated.
  • the lubricating material for the extraction of the temporarily buried reinforcement can be fabricated in the shape of a bag or a tube as by means of heat sealing, adhesion, sewing, or connection.
  • the water-absorbent polymer sheet layer which is provided for the lubricating material of this invention for the extraction of the temporarily buried reinforcement has the water-absorbent polymer directly deposited fast on the substrate, it rarely suffers from accidental separation of the water-absorbent polymer during the insertion of the reinforcement into the cement layer, the extraction of the reinforcement from the cement layer, or the swelling of the water-absorbent polymer sheet layer with the cement water.
  • the water-absorbent polymer is disposed uniformly throughout the entire surface of the reinforcement and allowed to manifest extremely high lubricity during the extraction of the reinforcement.
  • the water-absorbent polymer sheet layer uses no binder, the water-absorbent polymer encounters no obstruction in swelling with the absorbed cement water and allows the interposition of a large gap between the reinforcement and the cement layer.
  • the use of the lubricating material of this invention for the extraction of the temporarily buried reinforcement permits a decrease in the frictional resistance offered during the extraction of the temporarily buried reinforcement and facilitates the extraction and recovery of the reinforcement to a great extent.
  • the lubricating material of this invention for the extraction of the temporarily buried reinforcement features thinness and flexibility because the water-absorbent polymer layer provided therefor has a small thickness and has the water-absorbent polymer directly deposited fast on the substrate formed of flexible fibers or non-woven fabric.
  • the disposition of the lubricating material of this invention for the extraction of the temporarily buried reinforcement on the surface of a reinforcement destined to be driven into the cement layer can be attained by a simple work of nipping or wrapping.
  • the lubricating material enjoys high workability and great ease of handling. Further, it can be easily fabricated in the shape of a bag or combined with other material by means of heat sealing, sewing, and connection.
  • the lubricating material of this invention for the extraction of the temporarily buried reinforcement is produced in the shape of a bag from the beginning, it enjoys a further improvement in workability as evinced by the fact that the disposition thereof on a given reinforcement is accomplished simply by inserting this reinforcement in the bag.
  • the lubricating material of this invention for the extraction of the temporarily buried reinforcement which is provided with the water-absorbent polymer sheet layer allows the temporarily buried reinforcement to be extracted and recovered exclusively because the lubricating material does not adhere to the reinforcement during the extraction of this reinforcement. For this reason, the lubricating material for the extraction of the temporarily buried reinforcement which has been used once does not need to be removed elaborately from the surface of the extracted reinforcement but allows very convenient reuse of the extracted reinforcement.
  • the extracted reinforcement can be put to use again with the surface thereof in a state neither smeared with cement or soil nor defiled with rust.
  • the water-absorbent polymer directly deposited fast on the substrate is a polymer containing a sulfonic acid group, it is only sparingly susceptible of the influence of the calcium salt contained in the cement water and, therefore, manifests stably a prominent ability to swell with the cement water, functions ideally as a lubricating material, and further enhances the ease of extraction of the temporarily buried reinforcement.
  • An aqueous 40 wt% monomer solution was produced by preparing an aqueous solution of sodium acrylate having a 75% portion thereof neutralized with sodium hydroxide and dissolving 0.12 mol% of N,N-methylenebisacrylamide (based on the amount of the sodium acrylate monomer) and 1.0 g/mol of sodium persulfate (based on the amount of the sodium acrylate monomer) in the aqueous sodium acrylate solution.
  • a non-woven fabric made of polypropylene and having a basis weight of 25 g/m2 was immersed in the aqueous monomer solution and impregnated with this solution and then wrung with rollers to remove excess aqueous monomer solution.
  • the impregnated non-woven fabric was heated to effect radical polymerization of the monomer solution in the fabric and obtain a water-absorbent polymer sheet (1) having a water-absorbent polymer directly fixed at a ratio of 40 g/m2 in the fabric as a substrate.
  • This water-absorbent polymer sheet (1) was labeled "a lubricating material (1) of this invention for the extraction of a temporarily buried reinforcement.” It had a thickness of 200 ⁇ m.
  • a planar iron sheet 150 mm in height and 70 mm in width was wrapped with the lubricating material (1) of this invention for the extraction of a temporarily buried reinforcement and placed in a container filled with cement milk obtained by blending cement, water, bentonite, and earth.
  • the planar iron sheet wrapped with the lubricating material (1) could be easily extracted with a strength of 15 g/cm2.
  • the lubricating material (1) for the extraction of the temporarily buried reinforcement could be readied for use by a simple work of wrapping the planar iron sheet therewith. Thus, it enjoyed high workability and great ease of handling.
  • An aqueous 45 wt% monomer solution was produced by preparing an aqueous solution of the potassium salt of 2-acryloylpropanesulfonic acid and dissolving 0.1 mol% of N,N-methylenebisacrylamide (based on the amount of the potassium salt monomer of 2-acryloylpropanesulfonic acid) and 1.0 g/mol of sodium persulfate (based on the amount of the potassium salt monomer of 2-acryloylpropanesulfonic acid).
  • a non-woven fabric made of polyester and having a basis weight of 30 g/m2 was immersed in the aqueous monomer solution and impregnated with this solution and then wrung with rollers to remove excess aqueous monomer solution.
  • the impregnated non-woven fabric was heated to effect radical polymerization of the monomer solution in the fabric and obtain a water-absorbent polymer sheet (2) having a water-absorbent polymer containing a sulfonic acid group directly fixed at a ratio of 70 g/m2 in the fabric as a substrate.
  • This water-absorbent polymer sheet (2) was labeled "a lubricating material (2) of this invention for the extraction of a temporarily buried reinforcement.” It had a thickness of 250 ⁇ m.
  • a planar iron sheet 150 mm in height and 70 mm in width was wrapped with the lubricating material (2) of this invention for the extraction of a temporarily buried reinforcement and placed in a container filled with cement milk obtained by blending cement, water, bentonite, and earth.
  • the planar iron sheet wrapped with the lubricating material (2) could be easily extracted with a strength of 11 g/cm2.
  • the lubricating material (2) for the extraction of the temporarily buried reinforcement manifested an ideal ability to swell with water stably for a long time. It could be readied for use by a simple work of wrapping the planar iron sheet therewith. Thus, it enjoyed high workability and great ease of handling.
  • a lubricating material (3) of this invention for the extraction of a temporarily buried reinforcement was produced by melt extruding polypropylene and applying the extruded molten polymer to one side of the water-absorbent polymer sheet (1) obtained in Example 1 thereby providing a water-impermeable polypropylene layer 30 ⁇ m in thickness on one side of the water-absorbent polymer sheet.
  • This lubricating material (3) had a thickness of 250 ⁇ m.
  • the lubricating material (3) for the extraction of the temporarily buried reinforcement was heat sealed in the shape of a bag with the polypropylene layer falling on the inner side of the bag.
  • a planar iron sheet 150 mm in height and 70 mm in width was inserted in the bag of the lubricating material (3) for the extraction of the temporarily buried reinforcement and then placed in a container filled with cement milk obtained by blending cement, water, bentonite, and earth.
  • planar iron sheet could be easily extracted with a force of 10 g/cm2. Further, the lubricating material (3) for the extraction of the temporarily buried reinforcement could be readied for use by a simple work of inserting the planar iron sheet in the bag of the lubricating material (3). Thus, it enjoyed high workability and great ease of handling.
  • planar iron sheet was extracted from the cement, it did not suffer the used lubricating material (3) to persist on the surface of the extracted planar iron sheet. The planar iron sheet thus extracted was in such a state that it could be directly put to use again without any modification.
  • a mixed liquid obtained by mixing 100 parts of starch paste with 20 parts of a water-absorbent polymer was applied to the obverse surface of a kraft paper having a basis weight of 100 g/m2 and then a non-woven fabric of polypropylene was superposed on the coated surface of the kraft paper and the resultant composite was dried. Then, a polyacrylic ester type tackiness agent was applied to the reverse surface of the kraft paper and a release paper was attached fast to the layer of the tackiness agent to obtain a tape of lubricating material (1) for the extraction of a temporarily buried reinforcement to be used as a control. This tape had a thickness of 400 ⁇ m.
  • this lubricating material (1) for control was applied fast to the obverse surface of a planar iron sheet 150 mm in height and 70 mm in width.
  • planar iron sheet having the lubricating material (1) for control applied fast thereto was placed in a container filled with cement milk obtained by blending cement, water, bentonite, and earth.
  • the planar iron sheet coated with the lubricating material (1) for control could be extracted with a force of 70 g/cm2.
  • the work of applying the lubricating material (1) for control fast to the planar iron sheet was troublesome.
  • the planar iron sheet was extracted from the cement, the used lubricating material (1) for control was still adhering to the surface of the extracted planar iron sheet.
  • a surface-treating agent composed of 15 parts by weight of a water-absorbent polymer, 35 parts by weight of an extender of an acrylic type resin, 25 parts by weight of xylene, 5 parts by weight of n-butanol, and 20 parts by weight of methylethyl ketone was applied to a planar iron sheet 150 mm in height and 70 mm in width.
  • the applied layer of the surface-treating agent was dried.
  • the coated planar iron sheet was placed in a container filled with cement milk obtained by blending cement, water, bentonite, and earth.
  • planar iron sheet coated with the surface-treating agent could be extracted with a force of 50 g/cm2.
  • the application of the surface-treating agent to the planar iron sheet was a troublesome work.
  • the planar iron sheet thus extracted was in such a state that the water-absorbent polymer and the extender were still adhering to the surface thereof.
  • a planar iron sheet 150 mm in height and 70 mm in width was placed alone as a temporary reinforcement in a container filled with cement milk obtained by blending cement, water, bentonite, and earth. An attempt to extract this planar iron sheet from the cement after its 3 months' standing in the cement entailed difficulty.
  • An aqueous 40 wt% monomer solution was produced by preparing an aqueous solution of sodium acrylate having a 60% portion thereof neutralized with sodium hydroxide and dissolving 0.1 mol% of methylenebisacrylamide (based on the amount of the sodium acrylate monomer) and 1.0 g/mol of sodium persulfate (based on the amount of the sodium acrylate monomer) in the aqueous sodium acrylate solution.
  • a non-woven fabric made of complex fibers of polyethylenepolypropylene and having a basis weight of 25 g/m2 was immersed in the aqueous monomer solution and impregnated with this solution and then wrung with rollers to remove excess aqueous monomer solution and effect deposition of the aqueous monomer solution on the non-woven fabric at a ratio of 180 g/m2.
  • the impregnated non-woven fabric was heated to effect radical polymerization of the monomer solution in the fabric and obtain a water-absorbent polymer sheet (3) having a water-absorbent polymer directly fixed at a ratio of 40 g/m2 in the fabric. This sheet was capable of absorbing 80 times its weight of purified water.
  • This water-absorbent polymer sheet (3) was labeled "a lubricating material (4) of this invention for the extraction of a temporarily buried reinforcement.” It had a thickness of 250 ⁇ m.
  • This lubricating material (4) for the extraction of the temporarily buried reinforcement was folded and the opposite ends of the folded material were heat sealed to obtain a tube about 20 cm in diameter. The end part of this tube was heat sealed to produce a bag 20 cm in diameter and 30 cm in length. A steel H pile 3 cm in width and 30 cm in length was inserted into this bag.
  • the steel H pile placed in the bag of the lubricating material (4) for the extraction of the temporarily buried reinforcement was placed in a container made of polypropylene and measuring 9 cm in diameter and 27 cm in height and filled with soil cement.
  • the soil cement was prepared by blending 12.8 parts by weight of cement, 52.6 parts by weight of water, 1.3 parts by weight of bentonite, and 33.9 parts by weight of clay.
  • a water-impermeable polypropylene layer 20 ⁇ m in thickness was formed on one side of the water-absorbent polymer sheet (3) obtained in Example 5 by melt extruding polypropylene and applying the extruded molten polymer to the one side of the water-absorbent polymer sheet (3).
  • a lubricating material (5) of this invention for the extraction of a temporarily buried reinforcement was obtained.
  • a steel H pile was placed in the lubricating material (5) and placed in soil cement in the same manner as in Example 4.
  • a water-impermeable polypropylene layer 100 ⁇ m in thickness was formed on one side of the water-absorbent polymer sheet (3) obtained in Example 5 by melt extruding polypropylene and applying the extruded molten polymer to the one side of the water-absorbent polymer sheet (3).
  • a lubricating material (6) of this invention for the extraction of a temporarily buried reinforcement was obtained.
  • a steel H pile was placed in the lubricating material (6) and placed in soil cement in the same manner as in Example 4.
  • Example 4 The procedure of Example 4 was repeated excepting a steel H pile inserted in a bag 100 ⁇ m in thickness was placed in cement.
  • the lubricating material (5) obtained in Example 5 for the extraction of a temporarily buried reinforcement was folded with the polypropylene layer held on the inner side and the joined edges of the folded material were heat sealed.
  • the folded material was cut into lengths of 6 m.
  • Each cut length of the folded material was fabricated into an envelope 6 m in length and 1 m in width by heat sealing one cut end of the length.
  • the envelope was corrugated by inserting alternating folds at intervals of 50 cm to acquire the shape of bellows.
  • the lubricating material (5) so fabricated in the shape of a bellows was set in place on a supporting base as shown in Fig. 3.
  • a steel H pile 5 m in length and 20 cm in width suspended from above by a crane was inserted into the bag and buried in a hole 60 cm in diameter and 5 m in depth filled with soil cement.
  • This soil cement was composed of 280 parts by weight of cement, 25 parts by weight of bentonite, and 900 parts by weight of water.
  • Example 7 The procedure of Example 7 was repeated while using a hole 10 m in depth and a steel H pile 10 m in length and 30 cm in width instead.
  • the lubricating material (5) fabricated in the shape of a bellows for the extraction of a temporarily buried reinforcement had a length of 11 m.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
EP95300228A 1994-01-14 1995-01-13 Matériau lubrifiant pour l'extraction d'une structure temporairement enterrée Withdrawn EP0663477A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP272394 1994-01-14
JP2723/94 1994-01-14

Publications (1)

Publication Number Publication Date
EP0663477A1 true EP0663477A1 (fr) 1995-07-19

Family

ID=11537238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95300228A Withdrawn EP0663477A1 (fr) 1994-01-14 1995-01-13 Matériau lubrifiant pour l'extraction d'une structure temporairement enterrée

Country Status (1)

Country Link
EP (1) EP0663477A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6280120B1 (en) 1998-07-27 2001-08-28 Nippon Shokubai Co., Ltd. Adhesion preventing method and support body extracting method
KR20040072330A (ko) * 2003-02-12 2004-08-18 (주)피에스테크 파일 인출용 이형 피복재 및 이를 이용한 가설 흙막이토류벽 공법
EP1657053A1 (fr) * 2004-11-16 2006-05-17 Nippon Shokubai Co., Ltd. Feuille pour le génie civil et la construction
CN109403274A (zh) * 2018-11-28 2019-03-01 上海港湾基础建设（集团）股份有限公司 一种泥板复合围堤

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58104058A (ja) * 1981-12-15 1983-06-21 清水建設株式会社 セメント系硬化物と固体との構築方法
JPS59122621A (ja) * 1982-12-29 1984-07-16 Kumagai Gumi Ltd 杭の引き抜きのための処理方法
JPS60242218A (ja) * 1984-05-17 1985-12-02 Kumagai Gumi Ltd 杭の引き抜きのための処理方法
JPS62174418A (ja) * 1985-08-20 1987-07-31 Masato Ohori 杭引抜等に用いる吸水潤滑テ−プ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58104058A (ja) * 1981-12-15 1983-06-21 清水建設株式会社 セメント系硬化物と固体との構築方法
JPS59122621A (ja) * 1982-12-29 1984-07-16 Kumagai Gumi Ltd 杭の引き抜きのための処理方法
JPS60242218A (ja) * 1984-05-17 1985-12-02 Kumagai Gumi Ltd 杭の引き抜きのための処理方法
JPS62174418A (ja) * 1985-08-20 1987-07-31 Masato Ohori 杭引抜等に用いる吸水潤滑テ−プ

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 114 (M - 473)<2171> 26 April 1986 (1986-04-26) *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 14 (M - 659) 16 January 1988 (1988-01-16) *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 201 (M - 325)<1638> 14 September 1984 (1984-09-14) *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 244 (M - 337)<1681> 9 November 1984 (1984-11-09) *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 96 (M - 294)<1533> 4 May 1984 (1984-05-04) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6280120B1 (en) 1998-07-27 2001-08-28 Nippon Shokubai Co., Ltd. Adhesion preventing method and support body extracting method
KR20040072330A (ko) * 2003-02-12 2004-08-18 (주)피에스테크 파일 인출용 이형 피복재 및 이를 이용한 가설 흙막이토류벽 공법
EP1657053A1 (fr) * 2004-11-16 2006-05-17 Nippon Shokubai Co., Ltd. Feuille pour le génie civil et la construction
CN109403274A (zh) * 2018-11-28 2019-03-01 上海港湾基础建设（集团）股份有限公司 一种泥板复合围堤

Similar Documents

Publication Publication Date Title
US4467015A (en) Waterproofing structure
KR100425491B1 (ko) 접착방지방법 및 지지체 수거방법
US8454773B2 (en) Induction welded waterproofing
US20080057810A1 (en) Production Of Absorbent Composites
WO2006069689A1 (fr) Textiles bidimensionnels ou tridimensionnels contenant des materiaux pouvant gonfler
EP0663477A1 (fr) Matériau lubrifiant pour l&#39;extraction d&#39;une structure temporairement enterrée
JP2985931B2 (ja) 仮埋設物引抜用潤滑材
CA2143297C (fr) Doublure impermeable a l&#39;eau
US5584601A (en) Process for production of cut-off walls
CN116769416A (zh) 一种双搭接高分子防水卷材
CA1161263A (fr) Capsule de cimentation
JP3212584B2 (ja) 地下構造物の建造方法
JP3312069B2 (ja) 地下構造物の防水工法
JP3253949B2 (ja) 接着防止材
JP3497027B2 (ja) 複合止水材
JP4231186B2 (ja) 付着防止剤およびそれを用いた接続支持体撤去工法
JP4004654B2 (ja) 被覆材
JP2007315171A (ja) シート状可撓性材料
JP2000265468A (ja) 接着防止材
WO2001055279A1 (fr) Matiere d&#39;etancheite resistante a l&#39;eau
CA1150612A (fr) Stratifie renfermant une couche de glissement bitumineuse
JP2002322647A (ja) ホットメルト型表面処理剤
CN1197873A (zh) 土方工程用框体的制造方法
JP3751581B2 (ja) 被覆材、被覆構造体およびその製造方法
JP3212955B2 (ja) 表面処理剤、埋設物、および接着防止方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19950818

17Q First examination report despatched

Effective date: 19970410

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19970806