WO2003102331A1

WO2003102331A1 - Stress end portion structure of prestressed concrete structure body and method of forming the stress end portion

Info

Publication number: WO2003102331A1
Application number: PCT/JP2003/006817
Authority: WO
Inventors: Tsutomu Kadotani; Yoshitaka Nishida; Minoru Uemura; Nobuyuki Hayashi
Original assignee: Anderson Technology Corporation
Priority date: 2002-05-30
Filing date: 2003-05-30
Publication date: 2003-12-11
Also published as: US20050210782A1; WO2003102331A8; EP1514981A1; AU2003241952A1

Abstract

A stress end portion of a prestressed concrete structure body is formed easily and reliably. A grout can (5) in a stress end portion structure of a prestressed concrete structure body is formed from a transparent material, particularly preferably from a transparent electrically insulative material. Grout filling is surely performed while the introduction and filling of grout (G) into the grout can (5) being watched and confirmed from outside the grout can. Transparent electrically insulative material is preferably synthetic resin and, particularly, ionomer resin.

Description

'' Description Tensioned end structure of prestressed concrete structure and construction method of tensioned end

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

Conventionally, in a method of manufacturing a prestressed concrete structure (boast tension method), after placing a PC steel material, a sheath covering the same and a reinforcing bar in a formwork, a concrete is poured into the formwork, and the concrete is cast. After the REET reaches the specified strength, the PC steel is tensioned from the left and right ends or one or the other, and the end of the PC steel is fixed with a fixing tool to introduce prestress into the concrete. Then, to prevent corrosion of the tensioned PC steel material and to fix the PC steel material in a tensioned state in the sheath, and to fix the vicinity of the fixing section, grout from outside to the vicinity of the fixing section and into the sheath. At a high pressure (0.5 to lMPa). At this time, the grout can is fixed to the fixing section and the entire fixing section is covered in a sealed state, and then the grout is introduced and filled into the inside from the external communication hole (attached to the grout hose) of the grout can. Japanese Patent Application Laid-Open No. H8-353531 discloses a method using a metal grout can. However, in this case, since the inside cannot be seen, the completeness of grout filling at a particularly important tensioned end is reduced. I could not confirm. In addition, there was a concern that a potential difference might occur between the steel and the dissimilar metals such as PC steel due to the metal, causing corrosion current to flow and leading to corrosion of the PC steel.

Further, when grout is injected and filled into the grout canan at a high pressure (0.5 to 1 MPa), the grout canan becomes flat bottom as exemplified in JP-A-8-35331. When 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.

In addition, in the case of internal cable construction, 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. In addition, in the case of external cable construction, 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.

(1) 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.

(2) 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.

(3) 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 α-olefin and α,] 3-unsaturated carboxylic acid into a metal. The tension end structure of the prestressed concrete structure according to the above (1) or (2), wherein the resin is a resin neutralized with ions. JP03 / 06817

(4) The prestressed concrete according to any one of (1) to (3) above, wherein the grout can is a half hollow spherical shape having a ring-shaped rib at an upper edge. Tension end structure of the structure.

(5) 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 tensioned end structure of the prestressed concrete structure according to claim 1.

(6) 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). Tensioned end structure of a prestressed concrete structure.

(7) The tensioned end structure of the prestressed concrete structure according to any one of (1) to (6), wherein the grout can is formed of an electrically insulating material.

(8) In the method of constructing the tension end of the prestressed concrete structure, 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.

(9) 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 method for constructing a tensioned end portion of a prestressed concrete structure according to the above item (8), characterized in that:

(10) 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 α-olefin and ひ, 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. Method c

(11) The prestress according to any one of the above items (8) to (10), wherein the grout can is a hollow hollow spherical body having a ring-shaped rib at an upper edge. Construction method of tensioned end of concrete structure.

(1 2) Any of the above items (8) to (10), characterized in that the grout can is a bottomed cylinder having a ring-shaped rib on the upper edge and a hollow spherical body at the bottom. Or the method for constructing a tensioned end of a prestressed concrete structure according to item 1.

(13) Any one of the above items (8) to (12), characterized in that the outer surface of the grout canan is formed on an uneven surface so as to easily adhere to the concrete or mortar for back filling. How to construct the tensioned end of prestressed concrete structure as described in section? Leave.

(14) The tensioned end of the prestressed concrete structure according to any one of the above (8) to (13), wherein the grout can is made of an electrically insulating material. Construction method.

(15) 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. BRIEF DESCRIPTION OF THE FIGURES

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

Explanation of reference numerals

1: PC steel cable,,

2: Sheath,

3: Fixing device socket,

4: Fixer plug,

5, 5 ', 5 ": grout can,

5a, 5a \ 5a ": Groutcan ribs,

5 b, 5 b ', 5 b ": grout discharge mounting pipe,

5 c, 5 c ': grout discharge fittings,

5d: bolt 揷 insertion hole,

5 e: grout injection fitting,

6: grout hose,

7: Packing,

8: Dolka Tokyan fixing bolt,

9: spiral muscle,

10: Joint of different diameter,

10 a: Mounting pipe for injecting a dart of different diameter joint,

1 1: Anchor plate,

1 2: Anchor head,

1 3: ゥ edge,

14: Inner transit,

15: Outer transit,

1 6: caulking ring,

17: Resin sheath,

1 8: steel pipe,

50: Half-hollow hollow spherical body

5 1: Cylindrical part,

C: Concrete,

G: Grout, M: backfill concrete or mortar,

V: void

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described with reference to the drawings.

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.

In the figure, C is concrete, G is grout, M is backfill concrete or mortar, 1 is PC steel cable, 2 is sheath, 3 is fixing device socket, 4 is fixing device plug, 5, 5, 5 "Is a small can, 5a, 5a ', 5a" is a rib of a groutcan, 5b, 5b', 5b "and 5c, 5c, are mounting pipes for grout, 5d, 5 d ', 5d "are bolt insertion holes, 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, and 16 is a swage ring , 17 is a resin sheath, and 18 is a steel pipe. First, as shown in the cross-sectional explanatory view of the tensioned end structure near the anchoring section of the inner cable system in Fig. 1, 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. On the fixing portion at the tensioned end, 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 grout shown in FIGS. 6 (a) and (b) The can 5 "is a bottomed cylindrical body having a ring-shaped rib 5a" on the upper edge and a slightly curved bottom. As shown in FIGS. 1 and 4, 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.

Therefore, as shown in Fig. 1, when the grout G is introduced from the grout injection fitting tube 10a of the different diameter joint into the sheath 2 under high pressure (h. 5 to lMPa), the plug 4 The grout can 5 is filled with grout G through the through-holes (not shown). The excess grout is discharged to the outside through the grout discharge fitting pipes 5 b and 5 c and the drain hoses 6 and 6. Is done. At this time, since groutcyan 5 is made of a transparent material (transparent material), the filling state of grout can be easily seen from the outside, and an unfilled void remains on the inner wall of groutcyan 5. Can be easily found, and additional filling can be performed to achieve a completely filled state.

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. Next, as for the construction of the tensioned end near the anchoring part of the outer cable system, as shown in the cross-sectional view of the tensioned end structure near the anchoring part in Fig. 2, 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.

In addition, 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.揷 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.

In the inner trumpet 1.4 and the resin sheath 17, 12 to 27 PC steel capes 1 ′ are pierced.

A grout can 5 ′ is fixed to the surface of the anchor plate 11 with a grout canan fixing bolt 8.

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.

At the connection hole drilled in the abdomen of the grout can 5 ′, 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. At this time, since 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. In the present invention, 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) 衝撃 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 α-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 (ΕI) and has excellent transparency, pressure resistance, and pressure resistance. Excellent in flexibility and toughness.

In addition, since the above transparent materials generally do not have electrical conductivity (electrical insulation), there is no need to worry about the generation of corrosion current. It is preferable that polyethylene (or an ionomer resin of a derivative thereof) does not leak harmful substances (environmental hormones, etc.) into the environment.

Further, in the present invention, since the grout can is transparent, the unfilled portion of the grout can be easily visually recognized from the outside. After the grout is solidified, the grout can is pierced to provide an inlet and an outlet, and the grout is provided. It can also be refilled and filled completely (inspection of filling condition, easy repair, certainty). Example:

The present invention will be specifically described with reference to examples.

Example 1:

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.

As a transparent and electrically insulating resin material, “Himilan 1706” (trade name), which is an ionomer resin of a polyethylene derivative manufactured by Mitsui DuPont Polychemicals Co., Ltd., was used.

As shown in Fig. 4, the shape of the grout can 5 is a half-hollow hollow spherical body having a ring-shaped rib 5a at the upper edge, and has an inner diameter of the upper edge of 122mm, a height of 60mm, and a rib width of 17mm. The grout hose mounting pipes 5b (outer diameter 19 mm) and 5c (outer diameter 19 mm) of the grout hose are attached, and the grout hose 6 is connected. Therefore, first, as shown in FIG. 1, grout G made of cement milk containing an admixture such as a dispersant is introduced into grout yan 5 through the fixing section from the mounting pipe 10a for injection of grout and into the grout yan 5. .

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 ゃ leakage of the grout is recognized. I couldn't.

The introduction status of 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.

As shown in FIGS. 5 (a) and 5 (b), 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.

Therefore, as shown in the cross-sectional view near the fixing part in Fig. 2, 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 couldn't.

In addition, 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.

As shown in Fig. 6 (a) and (b), 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.

Groutkiyan 5 "is for upper edge cylindrical inner diameter 108mm, height 150mm, rib width 24 mm, made of acrylic resin.

Therefore, as shown in Fig. 3, 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 ".

If there is a possibility that the gap is continuous inside the structure along the tendon, it will be possible to investigate by drilling a hole in Dalek Tokyan and inserting a fiberscope. Industrial applicability

As described above, according to the present invention, since 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.

In addition, if 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.

Further, by making 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.

Also, when a transparent resin grout can is used, it is easy to handle even if it is relatively large, because it is lightweight.

In addition, in the embodiment using the transparent dart plate, 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.

Claims

The scope of the claims

(1) The grouting yan which is mounted on the fixing section so as to cover the entire area is filled with a tension material and a cement or non-cement type filler for preventing and protecting the fixing device. A tensioned end structure for a prestressed concrete structure, wherein the grouted yan is made of a transparent material.

(2) The transparent material constituting the grout can is one or more materials selected from the group consisting of polyethylene or derivatives thereof, polypropylene, polystyrene, polycarbonate, polymethyl methacrylate or polychlorinated vinyl. The tensioned end structure of the prestressed concrete structure described in (1) above, which is characterized by the following.

(3) The transparent material constituting the grout can is mainly composed of an ionomer resin, and the ionomer resin is composed of a metal ion having a carboxyl group of a copolymer of α-olefin and tri-unsaturated carboxylic acid. The tensioned end structure of the prestressed concrete structure according to the above (1) or (2), characterized in that the tensioned end is a resin neutralized with:

(4) The prestressed concrete structure according to any one of the above (1) to (3), wherein the grout can is a hollow hollow spherical body having a ring-shaped rib at an upper edge. Tensioned end structure.

(6) The outer surface of the grout can is attached to concrete or mortar for backfill. The tensioned end structure of the prestressed concrete structure according to any one of (1) to (5), wherein the tensioned end structure is formed on an uneven surface so as to be easily worn.

(8) In the method of constructing the tensioned end of the prestressed concrete structure, a grout can made of a transparent material is mounted on the fixing part, and the entire fixing part is covered with grout can. In addition, cement as a cement-based or non-cement-based filler for preventing and securing the fixing device is sufficiently introduced and filled while visually observing the filling state of grout into the interior of the dart tank. Construction method of tensioned end of prestressed concrete structure.

(9) The transparent material constituting the grout can is one or more materials selected from the group consisting of polyethylene or derivatives thereof, polypropylene, polystyrene, polycarbonate, polymethyl methacrylate or polyvinyl chloride. The method for constructing a tensioned end portion of a prestressed concrete structure according to the above item (8), characterized in that:

(10) 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 hyolefine and α, —non-encapsulated carboxylic acid into a metal. The method for applying a tensioned end of a prestressed concrete structure according to the above item (8), wherein the resin is a resin neutralized with ions.

(11) The prestress according to any one of the above items (8) to (10), wherein the grout can is a half hollow spherical shape having a ring-shaped rib at an upper edge. Construction method of tensioned end of concrete structure.

(12) Any one of the above items (8) to (10), wherein the grout can is a bottomed cylinder having a ring-shaped rib at an upper edge portion and a half hollow spherical body portion at a bottom portion. 2. The method for constructing a tensioned end of a prestressed concrete structure according to item 1.

(13) The method according to any one of the above items (8) to (12), wherein an outer surface of the grout can is formed to have an uneven surface so as to easily adhere to the concrete for filling or mortar. Of the tensioned end of the prestressed concrete structure.

(14) The tensioned end of the prestressed concrete structure according to any one of the above items (8) to (13), wherein the grout can is made of an electrically insulating material. Construction method.

(15) The strained end structure of the prestressed concrete structure or the transparent material grout described in any one of the above (1) to (13) used for their manufacture