WO2005116366A1 - 外ケ-ブル式pc構造物のケ-ブルシ-ス内への真空引き工程を含むグラウト注入工法 - Google Patents
外ケ-ブル式pc構造物のケ-ブルシ-ス内への真空引き工程を含むグラウト注入工法 Download PDFInfo
- Publication number
- WO2005116366A1 WO2005116366A1 PCT/JP2004/007842 JP2004007842W WO2005116366A1 WO 2005116366 A1 WO2005116366 A1 WO 2005116366A1 JP 2004007842 W JP2004007842 W JP 2004007842W WO 2005116366 A1 WO2005116366 A1 WO 2005116366A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sheath
- grout
- cable
- outer cable
- pump
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
-
- 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
- E04C5/10—Ducts
Definitions
- Injection method including vacuuming process into the cable sheath of the outer cable type PC structure
- the present invention relates to an outer cable type PC structure which is connected to the grout discharge side of a cable sheath.
- the pressure in the sheath is reduced by a vacuum pump, and then the grout is injected into the sheath.
- the grout injection method includes a vacuum drawing step of injecting and filling grout into the sheath by a pressure feed pump connected to the side, especially a grout into the sheath of the outer cable provided with a sheath made of a transparent material. Applied to injection, visually check the condition inside the sheath during grout injection, maintain the optimal operating state of the pumping pump and vacuum pump, and completely fill the sheath of the outer cable with grout.
- the present invention relates to a grout injection method that can provide a reliable PC structure reliably and easily.
- the following can be considered as the cause.
- the PC steel is tensioned.
- the grout injected and filled between the inner wall of the cable sheath and the PC steel is a mixture of cement, water, and an admixture.
- grout In order for the pond to be effective, grout must have good flowability and have properties that make it difficult for each material to separate between injection and curing. The However, due to the specific gravity difference existing between the cement and the water, while the grout hardens in the sheath, the cement sediments and separates downward, leaving water on the upper side (breathing water), and the water evaporates.
- the outer cable is required to have weather resistance because it is exposed to the outside air, unlike the inner cable embedded in a concrete structure. Therefore, as the sheath of the outer cable, a black polyethylene pipe or a steel pipe in which carbon black or the like is added to a polyethylene component that is less likely to deteriorate due to exposure to ultraviolet rays has been used. In addition, grout such as cement milk is injected into the sheath to provide anti-housing treatment to the PC steel material inserted into the sheath, but the injection state is visually observed because the sheath is a black polyethylene pipe or steel pipe. And no breathing occurred in the sheath during grout injection, it could not be recognized.
- a vacuum pump is connected to the grout discharge side to reduce the air pressure in the sheath
- An invention has been made to increase the filling / filling efficiency of the grouting pump connected to the bottom filling side.
- a vacuum pipe made of a transparent material with a closed end is provided at a bent portion or a high position where the grout in the cable sheath is likely to be incompletely filled with incompletely. The structure is such that the filling of grout can be confirmed by visually observing the grout that rises with respect to the air pressure in the vacuum pipe that has been reduced by the operation of the vacuum pump.
- the invention of a structure and a construction method that can be confirmed was performed (see Japanese Patent Application Laid-Open No. 2001-32211).
- the grouting method including the above-described evacuation step is applied to the outer cable including the sheath made of the transparent material according to the above invention and the grouting method can be more effectively performed.
- the present invention solves the above-mentioned problem of the prior art, and is a grout injection method for providing an outer cable that completely fills the sheath with grout without leaving a grout unfilled portion. It is due to.
- a pressure pump is connected to the grout injection side and a vacuum pump is connected to the discharge side, and the air pressure in the sheath is connected by the vacuum pump. After the pressure is reduced, the pressure pump is operated to fill the inside of the sheath with grout.
- the sheath is made of a transparent material, and the grout is injected into the sheath.
- a grouting method that involves vacuuming the inside of the cable sheath of an external cable-type PC structure, which is performed under optimum operating conditions while visually checking the conditions.
- the grouting method including the step of evacuating the outer cable-type PC structure into the cable sheath described in (1).
- FIG. 1 is an explanatory view of an operation of injecting grout into a cable sheath of an outer cable type PC structure.
- Fig. 1 is an illustration of the operation of injecting grout into the cable sheath of an external cable type PC structure.
- 1 is an outer cable
- 2 is a transparent sheath
- 3 is a grout injection pipe
- 3 v is a grout injection.
- On-off valve 4 is grout discharge pipe
- 4 V is grout discharge on-off valve
- 5 is deflector concrete
- 10 is pressure feed pump
- 20 is vacuum pump.
- a pressure feed pump 10 is connected to a grout injection pipe 3 disposed at one end of an outer cable 1 having a sheath made of a transparent material via a grout injection on-off valve 3 V.
- a vacuum pump 20 is connected to the grout discharge pipe 4 at the other end via a grout discharge open / close valve 4V.
- the grout injection on-off valve 3 V is closed, the grout discharge on-off valve 4 V is opened, and the vacuum pump 2 ⁇ ⁇ connected to the discharge pipe 4 is operated in an upright position.
- the discharge on-off valve 4 v After sucking the air inside the transparent sheath 2 to make it a vacuum, close the discharge on-off valve 4 v, stop the vacuum pump 2 ⁇ , open the injection on-off valve 3 V, and simultaneously operate the pressure pump 1 ⁇
- grout G is injected into the transparent sheath 2 from the grout injection pipe 3.
- the operation time of the vacuum pump 2 ⁇ , the start timing of the pressure pump 1 ⁇ , the injection pressure of the pressure pump 1 ⁇ , the injection speed, The injection time is controlled so that injection is more stable and reliable, and care is taken so that the grout G is completely injected and filled in the transparent sheath 2.
- the operation is controlled by controlling the operation of the pump 1 and the vacuum pump 20.
- the filling is insufficient.
- the properties of grout (2) It is used for filling grout such as pressure pumps and vacuum pumps.
- (1) In the properties of grout, its fluidity, viscosity, and material inseparability are related to the success or failure of the grout.
- the mixing ratio of water and cement which are the materials for grout, the particle size of cement, the properties of the admixture, and the kneading temperature of the grout, which is determined by the temperature of the constituent materials of the air, are filled with the grout. It is a factor in determining the success or failure of the project.
- the water cement ratio has a great influence on the flowability of the grout and the occurrence of bleeding.
- Water cement ratio is based on 4596 or less”. In the explanation, it is necessary to make the water cement ratio as small as possible within the range where the required consistency can be obtained. "
- the grout is injected by the pressure pump 1 ⁇ and the suction by the reduced pressure in the transparent sheath 2, so that a grout having a lower water cement ratio and a higher viscosity can be used, and the occurrence of bleeding can be reduced. It has the advantage that it can be suppressed.
- a grout that is made by adding a small amount of an inorganic colorant such as chromium oxide, iron oxide, copper oxide manganese oxide, or an organic colorant to grout G to be injected into the transparent sheath 2 and mixing it is used. You can also. By using the colored grout, the filling state in the transparent case 2 can be more clearly understood. At this time, the degree of coloring is not so strong, and it is desirable to adjust the degree of coloring so that the unfilled portion can be easily confirmed.
- examples of the material of the transparent sheath 2 include polyethylene resin, vinyl chloride resin, polypropylene resin, polycarbonate resin, and Teflon resin. Particularly, a material mainly composed of a polyethylene ionomer resin is used.
- the resin is preferably a resin in which the carboxy group of the polymer with S-unsaturated carboxylic acid is neutralized with a metal ion.
- the ionomer resin is a one-year-old olefin, is a binary copolymer with an unsaturated carboxylic acid, and contains 5 to 2% by weight of yS unsaturated carboxylic acid, and is neutralized by metal ions. Is preferably a copolymer of 10 to 90 mol% of the acid groups.
- the transparent sheath is desirably formed of one or a combination of two or more selected from the above materials.
- the term “transparent” of the “transparent sheath” in the present invention may mean, for example, that the filling state of grout filled inside the sheath can be visually observed from outside the sheath. It may have any properties as long as it fulfills the requirements.
- the term “transparent” may mean, for example, translucency, and the light at that time may mean visible light.
- the “sheath” is a hollow, typically cylindrical member that refers to a member through which a PC steel material can pass, and a PC steel material penetrating through the hollow portion as a sheath. Plays the function of covering.
- the concrete description of the above injection method is as follows: after sucking the air in the cable sheath to create a vacuum, close the grout discharge on-off valve, stop the vacuum pump, and then open the grout injection open / close valve.
- the grout injection method including the evacuation step for each step of injecting the grout into the sheath by operating the pressure pump was performed. Continuous operation without stopping the vacuum pump on the exhaust side at one end of the cable and continuous operation of the pump at the grout injection side at the other end to continuously inject grout from the grout injection pipe.
- the vacuum evacuation process of the formula can be applied to the grout injection method.
- a grout injection method including a vacuuming step is used for the outer cable of the transparent sheath, not only the condition inside the sheath during grout injection can be visually confirmed, but also more water cement. It is possible to use grout with a small grout ratio, not only to provide a more complete grouted outer cable, but also to check the process from the completion of filling until the grout hardens, and to check the filling status after curing. It can be expected to have effects such as easy maintenance and repair of external cables.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/007842 WO2005116366A1 (ja) | 2004-05-31 | 2004-05-31 | 外ケ-ブル式pc構造物のケ-ブルシ-ス内への真空引き工程を含むグラウト注入工法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/007842 WO2005116366A1 (ja) | 2004-05-31 | 2004-05-31 | 外ケ-ブル式pc構造物のケ-ブルシ-ス内への真空引き工程を含むグラウト注入工法 |
Publications (1)
Publication Number | Publication Date |
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WO2005116366A1 true WO2005116366A1 (ja) | 2005-12-08 |
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Family Applications (1)
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PCT/JP2004/007842 WO2005116366A1 (ja) | 2004-05-31 | 2004-05-31 | 外ケ-ブル式pc構造物のケ-ブルシ-ス内への真空引き工程を含むグラウト注入工法 |
Country Status (1)
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WO (1) | WO2005116366A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001032211A (ja) * | 1999-05-17 | 2001-02-06 | Anderson Technology Kk | 外ケーブルを配設した橋梁の箱桁構造及び同箱桁の構築方法 |
JP2002309777A (ja) * | 2001-02-07 | 2002-10-23 | Tetsuo Suzuki | Pc構造物のダクト内へのグラウトの注入充填方法と、グラウトの注入充填装置、及びグラウト充填確認用ダクト |
JP3521909B1 (ja) * | 2002-10-11 | 2004-04-26 | アンダーソンテクノロジー株式会社 | ポストテンション方式pc構造物の内ケーブルへのグラウト注入工法 |
-
2004
- 2004-05-31 WO PCT/JP2004/007842 patent/WO2005116366A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001032211A (ja) * | 1999-05-17 | 2001-02-06 | Anderson Technology Kk | 外ケーブルを配設した橋梁の箱桁構造及び同箱桁の構築方法 |
JP2002309777A (ja) * | 2001-02-07 | 2002-10-23 | Tetsuo Suzuki | Pc構造物のダクト内へのグラウトの注入充填方法と、グラウトの注入充填装置、及びグラウト充填確認用ダクト |
JP3521909B1 (ja) * | 2002-10-11 | 2004-04-26 | アンダーソンテクノロジー株式会社 | ポストテンション方式pc構造物の内ケーブルへのグラウト注入工法 |
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