摘要:
A method and an apparatus for reconstructing corroded pipes are disclosed in which a long, new pipe (P2) can be inserted smoothly and without excessive force, into an older pipe (P1). The method is particular in that it involves the insertion of a new pipe (P2) into an old pipe (P1), using a dolly (2) to transfer a reaction force to the old pipe (P1). The tail end of the new pipe (P2) is attached to the dolly (2). The front end of the new pipe (P2) is sealed off. A plug (3) is inserted into the dolly (2) from the tail end of the new pipe (P2), which is filled with pressurized fluid. The dolly (2) is then moved in the direction of the old pipe (P1) to insert the new pipe (P2) into the old pipe (P1).
摘要:
A method is provided to facilitate the removal of mercury from soil containing mercury or mercury compounds, respectively. For this purpose, an iron, nickel or other metal compound is added to soil contaminated with a mercury compound. Then, the mixture is heated to a temperature lower than the boiling point of the mercury compound.
摘要:
In a control system for synchronous rotation of the cutter heads in a multi-cutter shield machine, the rotating cutter heads are so disposed in generally same planes that the distance between the centers of the adjoining cutter heads is larger than the radius, and smaller than the diameter, of the cutter heads. The rotating cutter heads are driven independently of each other by the electric drive systems, respectively. Each of the electric drive systems consists of plural motors with a reduction gear, coupled to the respective rotating cutter heads by means of a pinion and gear. The motor rotation is so controlled and the cutter heads are so synchronously rotated, that the angle of deviation between the cutter heads is within such an allowable range that the cutter heads will not interfere with each other even if there is any imbalance in excavating and rotating resistances between the cutter heads.
摘要:
An interior panel according to the present invention comprises a plurality of support units (20) fixedly arranged on a floor slab (14), a panel member (16) supported by the support units (20) so as to be located over the slab surface (14) at a predetermined distance therefrom, and a cable separator (15) supported by the support units (20) and dividing the space between the panel member (16) and the slab surface (14) into upper and lower space sections. The cable separator (18) is in the form of a plate with a stepped surface portion (32) at the peripheral edge portion thereof, and can be supported on the support units (20) either in a first position in which the stepped portion (32) faces upward or in a second position in which the stepped portion (32) faces downward. Cables (70, 74) and electric devices (76, 78) in a signal transmission system are arranged in the upper space section defined by the cable separator (18), and power supply-system cables (70) and devices (72) in the lower space section.
摘要:
A material not releasing gaseous organic substances during use is used as a filter medium and a sealing material for tightly sealing between the medium and a frame. Specifically, a synthetic paraffin not containing an aliphatic hydrocarbon having not more than 19 carbon atoms or less is used as a non-silicone type water repellent contained in a treatment agent for forming fibers into a cloth-like filter medium. A carboxylic acid ester having 400 or more molecular weight is used as a plasticizer and a phenolic compound having 300 or more molecular weight is used as an antioxidant to be added to the treatment agent and the sealing material. This enables that the gaseous organic substances are not present in a clean room, a semiconductor production apparatus or the like. Further, if the filter medium and the sealing material are formed of a material not releasing organic phosphorus compounds and boron compounds in the air, a clean room and a local facility particularly suitable for use in the production of semiconductors are provided.
摘要:
A material not releasing gaseous organic substances during use is used as a filter medium and a sealing material for tightly sealing between the medium and a frame. Specifically, a synthetic paraffin not containing an aliphatic hydrocarbon having not more than 19 carbon atoms or less is used as a non-silicone type water repellent contained in a treatment agent for forming fibers into a cloth-like filter medium. A carboxylic acid ester having 400 or more molecular weight is used as a plasticizer and a phenolic compound having 300 or more molecular weight is used as an antioxidant to be added to the treatment agent and the sealing material. This enables that the gaseous organic substances are not present in a clean room, a semiconductor production apparatus or the like. Further, if the filter medium and the sealing material are formed of a material not releasing organic phosphorus compounds and boron compounds in the air, a clean room and a local facility particularly suitable for use in the production of semiconductors are provided.
摘要:
An electronic/electric part used in a clean room in which the atmosphere is controlled to process a substrate in a semiconductor device industry, which contains a resin base material and additives added to the resin base material. The additives contain one or more materials selected from the group consisting of an anti-electrostatic agent made of a nonionic compound of a molecular weight of 350 or higher, an anti-oxidizing agent made of a phenolic compound of a molecular weight of 300 or higher, a lubricant, a plasticizer, a fire retardant, and a water repellent. The additives hardly releases gaseous organic substances from the resin base material under a condition where the part is used.