Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
  • E04C5/08—Members specially adapted to be used in prestressed constructions
  • E04C5/12—Anchoring devices
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
  • E04C5/08—Members specially adapted to be used in prestressed constructions
  • E04C5/12—Anchoring devices
  • E04C5/122—Anchoring devices the tensile members are anchored by wedge-action

Definitions

• the present invention relates to a structure of a tensioned end portion of a prestressed concrete structure and a method of constructing the tensioned end portion, and in particular, adopts a transparent material for a grout can to ensure that the tensioned end portion is constructed. is there. Background art
• the grout canan becomes flat bottom as exemplified in JP-A-8-35331.
• the grout is formed in the shape of the bottomed cylindrical body, the grout is unevenly pressed on the inner surface of the grout, and there is a danger that the grout will deform and eventually leak.
• the grout can and the anchoring structure in the vicinity will be post-filled with concrete, but if the adhesion between the backfill concrete and the grout can is incomplete, the anchor will be The original purpose of integration of backfill concrete cannot be achieved.
• the grout can is relatively large, and there is a disadvantage that conventional metal products are heavy and inconvenient to handle. Disclosure of the invention
• the present inventors have studied to solve the above-mentioned problems of the prior art, and as a result, succeeded in establishing an almost perfect grout filling method, and have provided the present invention having the following constitution.
• a grout as a cement-based or non-cement-based anti-filling material for preventing and protecting the tensioning material and the fixing device is filled in a grout yan which is attached so as to cover the entire fixing portion.
• a tensioned end structure of a prestressed concrete structure characterized in that the groutkyan is made of a transparent material in the tensioned end structure of a prestressed concrete structure.
• the transparent material constituting the grout can is one or more materials selected from the group consisting of polyethylene or a derivative thereof, polypropylene, polystyrene, polycarbonate, polymethyl methacrylate or polychlorinated vinyl.
• the tensioned end structure of the prestressed concrete structure according to the above (1) which is characterized by the following.
• the transparent material constituting the grout can is mainly composed of an ionomer resin, and the ionomer resin is formed by converting the carboxyl group of a copolymer of ⁇ -olefin and ⁇ ,] 3-unsaturated carboxylic acid into a metal.
• the grout can is a bottomed cylinder having a ring-shaped rib at an upper edge and a half hollow spherical body at a bottom. 2.
• the outer surface of the grout can is formed into an uneven surface so that it can be easily attached to post-fill concrete or mortar, as described in any one of the above items (1) to (5).
• a grout can made of a transparent material is mounted on the fixing part, the entire fixing part is covered with grout can, and then tension is applied inside the grout can. It is important to sufficiently introduce and fill the cement as a cement-based or non-cement-based filler for preventing and protecting the material and fixing device, while visually observing the state of filling of the dart into the inside of the dart tank. Characteristic construction method of tensioned end of prestressed concrete structure.
• the transparent material constituting the grout can is one or more materials selected from the group consisting of polyethylene or a derivative thereof, polypropylene, polystyrene, polycarbonate, polymethyl methacrylate, and polychlorinated vinyl.
• the transparent material composing the grout can is mainly composed of an ionomer resin, and the ionomer resin is formed by converting the carboxyl group of a copolymer of ⁇ -olefin and ⁇ , unsaturated carboxylic acid into a metal.
• the tensioned end of the prestressed concrete structure described in (8) above is characterized by being a resin neutralized with ions.
• the grout can is a bottomed cylinder having a ring-shaped rib on the upper edge and a hollow spherical body at the bottom.
• the grout yan made of a transparent material according to any one of the above (1) to (13), which is used for producing a tensioned end structure of a prestressed concrete structure or the production thereof.
• FIG. 1 is a sectional view of a tensioned end structure of an inner cable type prestressed concrete structure according to a first embodiment of the present invention.
• FIG. 2 is a cross-sectional view of a tension end structure of an external cable type prestressed concrete structure according to a second embodiment.
• FIG. 3 is a cross-sectional view of a tension end structure of an external cable type prestressed concrete structure according to a third embodiment.
• FIG. 4 is a plan view and a cross-sectional view of the Daratokyan in FIG.
• FIG. 5 is a plan view and a cross-sectional view of the Daratokyan in FIG.
• FIG. 6 is a plan view and a cross-sectional view of the Daratokyan in FIG. 0306817
• G Grout
• M backfill concrete or mortar
• V void
• FIG. 1 is a sectional view of a tensioned end structure of an inner cable type prestressed concrete structure according to a first embodiment of the present invention.
• FIG. 2 is a cross-sectional view of the tension end structure of the outer cable type prestressed concrete structure of the second embodiment.
• FIG. 3 is a cross-sectional view of the tensioned end structure of the outer cable type prestressed concrete structure of the third embodiment.
• FIG. 4 shows a plan view and a sectional view of the grout can in FIG.
• FIG. 5 shows a plan view and a sectional view of the grout can in FIG.
• FIG. 6 shows a plan view and a cross-sectional view of the grout key in FIG.
• C is concrete
• G is grout
• M backfill concrete or mortar
• 1 PC steel cable
• 2 is sheath
• 3 is fixing device socket
• 4 is fixing device plug
• 5a, 5a ', 5a" is a rib of a groutcan
• 5b, 5b', 5b "and 5c, 5c are mounting pipes for grout
• 5e is grout injection mounting tube
• 6 is drip hose
• 7 is packing
• 8 is grout can fixed porto
• 9 is spiral muscle
• 10 is different diameter joint
• 10 a is a mounting pipe for grout injection of a different diameter joint
• 1 1 is an anchor plate
• 1 2 is an anchor head
• 13 is an edge
• 14 is an inner trumpet
• 15 is an outer trumpet
• 16 is a swage ring
• 17 is a resin sheath
• 18 is a steel pipe.
• the end of PC steel cable 1 is fixed by the socket 3 and plug 4 of the anchoring tool embedded in the end of concrete C. Established in tension.
• the sheath 2 is connected to the protruding portion 3a of the socket 3 via the joint 10 of different diameter, and 6 to 12 PC steel Bull 1.
• grout yan 5 is fixed with grout yan fixing bolt 8. As the grout can, those shown in FIGS. 4 to 6 can be used.
• the grout can 5 shown in Figs. 4 (a) and (b) is a half hollow sphere having a ring-shaped rib 5a at the upper edge, and is shown in Figs. 5 (a) and (b).
• 5 ′ is a bottomed cylindrical body having a ring-shaped rib 5 a ′ at the upper edge and a half hollow spherical body 50 at the bottom.
• the can 5 "is a bottomed cylindrical body having a ring-shaped rib 5a" on the upper edge and a slightly curved bottom.
• the connection holes formed in the abdomen of the grout can 5 are provided with mounting pipes 5b and 5c for discharging the dart for mounting the dart hose 6.
• Grout hoses (6), (6) are attached to them.
• Grout G is cement milk to which an admixture such as a dispersant is added and mixed. Then, a concrete or mortar M for post-filling is cast using a mold so as to cover the surface of the concrete C near the anchoring portion and the outer peripheral surface of the grout can 5 and is hardened. It is preferable that the post-fill concrete or mortar M is made of the same or similar material as the concrete C, and both are integrated.
• the anchor is attached to the outer surface of the concrete C end.
• the ends of the PC steel cable 1 are fixed in tension by the pads 12 and the edges 13.
• An anchor plate 11 is buried on the inner surface of the concrete C inside.
• an outer transit 15 and an inner transit 14 inserted inside the outer transit 15 are provided near the fixing portion, and a steel pipe 18 is fitted in a front portion of the outer transit 15. ⁇ It is done.
• a front portion of the inner trumpet 14 is fitted into a resin sheath 17 and a caulking ring 16 is wound around the outer peripheral surface of the overlapping portion of both.
• the grout can 5 ′ in this case is a bottomed cylindrical body provided with a ring-shaped rib 5 a ′ at the upper edge and a half hollow spherical body 50 at the bottom as shown in FIG. Part 51 is as tall as possible.
• grout discharge attachment pipes 5 b ′ and 5 c ′ for attaching the grout hose 6 are attached, and the grout hose 6 is attached to it. Have been. Therefore, as shown in the cross-sectional view of the vicinity of the fixing part in FIG. 2, grout G is introduced and filled with high pressure (0.5 to IMPa) into the grout can 5 ′ from the right through the space 17 between the sheaths.
• the grout G is filled through the through hole (not shown) of the anchor head 12 into the grout can 5 ′, and the excess grout is supplied to the grout discharge fittings 5 b ′, 5 c ′ and the grout hoses 6, 6. It is discharged to the outside.
• the grout can 5 ′ is made of a transparent material, the filling state of the grout can be easily visually observed from the outside, and it is easy if the unfilled void V remains on the inner wall of the grout can 5 ′.
• the grout G can be added to make a complete filling state.
• the transparent material used for the dart plate is a material in which the filling state of grout inside the dart plate, presence or absence of air bubbles, and the like can be visually confirmed from the outside, and may be any material that is transparent and has a certain strength. It may be made of synthetic resin, high-strength glass (may be reinforced glass coated with a transparent resin), or ceramic. In particular, a transparent synthetic resin material is preferably used, but pressure resistance (when grouting) ⁇ ⁇ impact resistance and moderate flexibility 'toughness (when bolting a rib portion) is required. An ionomer resin in which the carboxyl group of the copolymer of ⁇ -olefin, a derivative of polyethylene, and / —unsaturated carboxylic acid is neutralized with metal ions is used.
• the ionomer resin of this polyethylene derivative is a copolymer of ethylene with a small amount of a metal (meth) acrylate, and is also referred to as an ethylene-based ionomer ( ⁇ I) and has excellent transparency, pressure resistance, and pressure resistance. Excellent in flexibility and toughness.
• This embodiment is an example of the inner cable system shown in FIG.
• the grout can 5 was formed by injection molding of a transparent resin using a mold whose inner surface was previously processed into an embossed negative mold.
• Himilan 1706 (trade name), which is an ionomer resin of a polyethylene derivative manufactured by Mitsui DuPont Polychemicals Co., Ltd., was used.
• the grout canan 5 has a thickness of 4 mm and the pressure resistance satisfies the watertight IMP a, and even if the grout is introduced at a high pressure (0.5 to IMP a), deformation of the grout can 5 ⁇ leakage of the grout is recognized. I could't.
• Grout G was visible from the outside through Grout Kyan 5, and it was easily confirmed that there were no bubbles or voids.
• the surface of the grout can 5 was made uneven by embossing (not shown) and the adhesion to the backfill concrete M was good. It has been confirmed that it does not peel off after solidification.
• This embodiment is an example of the external cable system shown in FIG. 2, and the grout can 5 ′ is manufactured by injection molding using the same material as in the first embodiment.
• the shape of the grout can 5 ' is a bottomed cylindrical body having a ring-shaped rib 5a' at the upper edge and a hollow hollow spherical body 50 at the bottom.
• the grout hose mounting pipes (outside diameter: 19 mm) 5 b 'and 5 c' are protruded, and the grout hose 6 is connected to them.
• the grout can 5 has an upper edge cylindrical inner diameter of 227 mm, a height of 2'04 mm, and a rib width of 21.5 mm.
• grout G is introduced and filled at a high pressure (0.5 to 1 MPa) into the grout can 5 'through the sheath 17 from the right side.
• the grout G is filled into the grout can 5 ′ through a through hole (not shown) of the anchor head 12, and the excess grout is passed through the grout discharge mounting pipe 5 b ′, 5 c ⁇ grout hose 6, 6. It is discharged outside. During the filling of the grout, it was visually observed from the outside that the void V remained on the inner wall surface of the grout can 5 ′ .When grouting was continued further, the void V could not be seen, and the grout G was lost. It was found that it was completely filled.
• the grout G in this example used the same cement milk as in Example 1.
• the grout can 5 ' has a thickness of 4 mm and the pressure resistance satisfies the water tightness IMP a. Even when the grout is introduced at a high pressure (0.5 to lMPa), deformation of the grout can 5' and leakage of the grout are recognized. I could't.
• the resin grout can 5 ′ used in this example is lighter than conventional metal grout cans, so it is easy to handle, and because it is not conductive, PC steel corrodes due to the generation of corrosion current. I didn't have to worry.
• Example 3
• This embodiment is an example of the outer cable system shown in FIG. 3, and the same material as that of the first embodiment is used for the grout can 5 ", and it is manufactured by injection molding.
• the grout can 5 is a bottomed cylinder with a ring-shaped rib 5.a" on the upper edge and a slightly curved bottom.
• Pipes (outside diameter 19 mm) 5 b ", 5 e are protruded, and grout hose 6 is connected to them.
• Mounting pipe 5 b" is for grout discharge, and mounting pipe 5 e is grout injection. It is for.
• grout G is injected into grout yan 5 "via mounting pipe 5e and filled into grout yan 5", and is additionally added sufficiently so that no voids remain inside. Discharge through mounting pipe 5b ".
• the grout canan is made of a transparent material, the grout filling state inside the grout can can be easily visually observed from the outside when the tensioned end portion of the prestressed concrete structure is constructed, and can be reliably grasped. Now you can do it.
• the constituent material of the grout can is made of a transparent and electrically insulating material, there will be no potential difference between the steel and the metal such as PC steel, which is mediated by water present in invisible voids. As in technology, there is no danger that corrosion current will flow and lead to corrosion of PC steel.
• the grout canan a hollow hollow sphere having a half hollow sphere or a bottom hollow sphere having a half hollow sphere, the grout can is prevented from being deformed at the time of high-pressure injection and leaking out of the grout. Also, in the case of inner cable construction, if the outer surface of the grout can is processed into an uneven surface, the adhesion to the backfill concrete will be good.
• the filling of the dart plate was perfect, but in the outer capele method, even if for some reason there is a gap inside the grouted kyan after the filling and hardening of the grout, it is prevented from the outside.
• the grout cans can be repaired by drilling the grout cans into the grout can and refilling the grout again.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Reinforcement Elements For Buildings (AREA)

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• 2003
  • 2003-05-30 EP EP03730711A patent/EP1514981A1/de not_active Withdrawn
  • 2003-05-30 AU AU2003241952A patent/AU2003241952A1/en not_active Abandoned
  • 2003-05-30 WO PCT/JP2003/006817 patent/WO2003102331A1/ja not_active Application Discontinuation
  • 2003-05-30 US US10/516,401 patent/US20050210782A1/en not_active Abandoned

Patent Citations (2)

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