WO2005116367A1 - ポストテンション方式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の注入工法 - Google Patents
ポストテンション方式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の注入工法 Download PDFInfo
- Publication number
- WO2005116367A1 WO2005116367A1 PCT/JP2004/007846 JP2004007846W WO2005116367A1 WO 2005116367 A1 WO2005116367 A1 WO 2005116367A1 JP 2004007846 W JP2004007846 W JP 2004007846W WO 2005116367 A1 WO2005116367 A1 WO 2005116367A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- grout
- sheath
- cable
- injection
- post
- Prior art date
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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
Definitions
- the present invention relates to a grouting method for a cable sheath of a post-tension type PC structure.
- the cable material In most cases, PC steel is used as the cable material.Since the strands that compose the stranded wire have a sieving action or a capillary phenomenon, they may cause the separation of cement and water. .
- the vacuum pump was connected to the grout discharge side to reduce the air pressure inside the sheath, and the grout pressure pump connected to the grout injection side was used for injection. The invention of improving the filling efficiency has been made. In the above invention, the filling of the grout in the cable sheath becomes incomplete, and the vacuum pipe made of a transparent material with a closed end is provided with a concrete structure at the bent portion of the cable or at a high position.
- the present invention relates to a post-tension type PC structure, in which a pressure pump is connected to a grout injection side and a vacuum pump is connected to a discharge side of the cable of the PC structure, and the pressure inside the sheath is reduced by the vacuum pump.
- a grout injection method that includes a vacuuming step of injecting grout. This is a method of providing a cable that allows the sheath to be completely filled with grout without leaving unfilled portions of grout in the sheath.
- a pressure pump is connected to the grout injection side and a vacuum pump is connected to the discharge side. After the pressure is reduced, the pump is operated, and the grouting process including a vacuuming step of filling the grout in the sheath is performed.
- a grout injection test device having the same three-dimensional arrangement (ie, three-dimensional arrangement) as that of the construction site except that it does not have a structure is assembled using a cable whose sheath is made of a transparent material, and the grout injection test device is installed. A grout injection test is performed under a plurality of test conditions, and the grout injection condition in the transparent sheath is visually observed to obtain the best results.
- Injection of grout including the step of evacuating the cable tension of a post-tension type PC structure, characterized by selecting and applying the selected best grouting conditions to the site Construction method.
- (2) Post-tension system When grout is injected into the cable sheath of the PC structure, a pressure pump is connected to the grout injection side and a vacuum pump is connected to the discharge side, and the pressure inside the sheath is reduced by the vacuum pump.
- the grouting method includes a vacuuming step of filling the inside of the sheath with grout by operating the pressure pump later. Prior to the on-site construction, a casting concrete part is provided outside the construction site.
- the grout injection test device which has the same three-dimensional arrangement structure as the construction site except that the grout is not completely filled, is composed of a part where the grout is imperfectly incomplete and the sheath is made of a transparent material, and is assembled using a cable.
- a grouting test was performed under a plurality of test conditions using a grouting test apparatus, and the grouting state in the transparent sheath was visually observed to obtain the best results.
- a grouting condition obtained by selecting the grouting conditions to be obtained and applying the best grouting conditions thus selected to the site is included.
- Grout injection method is the same three-dimensional arrangement structure as the construction site except that the grout is not completely filled.
- the three-dimensionally arranged cable of the grout injection test device is characterized in that a sheath made of a transparent material is arranged only near the bent part and / or near the high position part (1) to (1). 3)
- the method of injecting grout which includes the step of evacuating the post-tension type PC structure into the cable sheath according to any one of the above 1).
- the sheath is made of transparent material and used for grout injection test equipment using cables.
- the method for injecting grout which comprises a step of evacuating a post-tensioning PC structure into a cable sheath according to any one of the above (1) to (4), characterized in that:
- the grout injection test conditions were: (1) Grout components and mixing ratio of each component, (2) Grout physical properties such as viscosity, temperature characteristics, breathing characteristics, etc., (3) Injection operation means of grout pumping pump, such as grout injection pressure, grout injection speed, grout injection amount, etc., and [4] decompression speed in the sheath, air pressure in the sheath at the start of grout injection
- Injection operation means of grout pumping pump such as grout injection pressure, grout injection speed, grout injection amount, etc.
- [4] decompression speed in the sheath air pressure in the sheath at the start of grout injection
- the post-tension according to any one of (1) to (5), which is one or more selected from [1] to [4] of vacuum pump operation operation means such as Method Grouting method including vacuuming process into cable sheath of PC structure.
- Fig. 1 is a schematic diagram of a grout injection test device
- Fig. 2 is a diagram illustrating the functional configuration and operation of the grout injection test device
- Fig. 3 is another embodiment of the grout injection test device.
- 6 grout injection pipe
- 6 V grout injection on-off valve
- the grout for the preliminary test of the same three-dimensional arrangement that is, three-dimensional arrangement
- the test equipment 1 has the same three-dimensional arrangement structure as the construction site except that it does not have a cast concrete part at the site, and is arranged along the entire length and arranged at one end of the cable 2.
- the pump 10 feeds the grout injection pipe 6 via the grout injection on-off valve 6 V and the vacuum pump 20 via the grout discharge on-off valve 8 V to the grout discharge pipe 8 at the other end. Is connected (see Fig. 2).
- a procedure of a grout injection test of the preliminary test cable 2 having the transparent sheath 3 into the transparent sheath 3 and a procedure of applying the test results to the construction site will be described.
- a grout injection test device 1 has a grout injection pipe 6 with a grout injection on-off valve 6 V via a grout injection on-off valve 6 V and a grout discharge pipe 8 with a grout discharge on-off valve.
- Vacuum pump 2 ⁇ is connected via 8 V.
- the grout injection on-off valve 6 V was closed, and the vacuum pump 20 connected to the discharge pipe 8 was operated with the grout discharge on-off valve 8 V involved, and the cable 2 was transparent. After sucking the air in the sheath 3 to create a vacuum, the grout discharge on-off valve 8 V is closed, the vacuum pump 20 is stopped, and the grout injection on-off valve 6 V is turned on. Activate and inject grout G into the transparent sheath 3 from the grout injection pipe 6.
- the test conditions such as the operation time of the vacuum pump 20, the pressure inside the transparent sheath 3 when starting the pump 1 1, the injection pressure of the pump 1 ⁇ , the injection speed, the injection time, etc. are selected to specific values.
- grout G is injected into the transparent sheath 3 of the cable 2, and under that condition, grout G is completely injected. Record the operating time of the vacuum pump, the air pressure inside the sheath when the pump is started, the injection pressure of the pump, the injection speed, and the injection time.
- a plurality of injection tests are performed by changing the type of grout, the grout kneading temperature, and the like, and the optimum grout is selected, and the optimum grout kneading temperature, etc. are recorded.
- the best grouting conditions were selected from the results of the grouting test as described above, and the selected grouting conditions were applied to the site and actual grouting was performed.
- the insufficient filling is caused by (1) the properties of grout, (2) grout filling such as a pressure pump and a vacuum pump. (3) The shape of the cable, (4) The shape of the fixing device and the location of the injection and discharge pipes, and (5) The temperature conditions at the construction site.
- the water-cement ratio has a significant effect on the flowability of grout and the occurrence of breathing.
- the water cement ratio is based on 45% or less”.
- the grout is injected by the pressure feeding of the pressure feeding pump 1 ⁇ and the suction in the sheath 3 by the reduced pressure, so that a grout having a lower water cement ratio and a higher viscosity can be used. It has the advantage of suppressing the occurrence. Therefore, the test items (conditions) for grout injection test are: 1 grout distribution
- B Ingredients and mixing ratio of each component, 2 Grout physical properties such as viscosity, temperature characteristics and breathing characteristics of grout, 3 Injection operation of grout pumping pump such as grout injection pressure, grout injection speed, grout injection amount, etc. Operation means, and means for operating the vacuum pump, such as the pressure reduction rate in the sheath and the air pressure in the sheath at the start of grout injection.
- Fig. 3 is an explanatory view of another embodiment of the grout injection test apparatus, that is, an example of using a partial test piece of the cable.
- Fig. 3 (a) shows a cable for a preceding test having the same three-dimensional arrangement structure as the construction site.
- Fig. 3 (b) is an enlarged illustration of a partial specimen of a cable whose length is likely to be incompletely filled with grout surrounded by the dashed line in Fig. 3 (a). Is shown.
- the partial test specimen for the length part where the grout was incompletely filled and produced was arranged and arranged as the same three-dimensional structure as the construction site.
- a pressure pump 10 is provided on the injection pipe 6 via a grout injection on-off valve 6 V, and is provided on the grout discharge side
- a vacuum pump is provided on the grout discharge pipe 8 via a grout discharge on-off valve 8 V 2) is connected, the grout injection on-off valve 6 V is closed, the grout discharge on-off valve 6 v is opened, and the vacuum pump 20 is driven with the grout discharge open and closed to reduce the pressure in the transparent sheath 3.
- the cable 2 having the transparent sheath 3 of the grout injection test apparatus 1 has not only the entire length of the transparent sheath 3 but also the incomplete filling of the grout and the height around the bent portion of the cable. Only the appropriate length in the vicinity of the position shall be the transparent sheath 3, and the other portions shall be made of black polyethylene or other sheath used on site.
- the grout G to be injected into the transparent sheath 3 by the grout injection test apparatus 1 must be the same as that used for on-site construction, but it is necessary to add chromium oxide, iron oxide, and copper oxide. It is also possible to use a colored grout by adding and mixing a small amount of an inorganic colorant such as a manganese oxide or an organic colorant.
- the filling state in the transparent sheath 3 can be more clearly understood.
- the degree of coloring is not so strong, and it is desirable to adjust the degree of coloring so that it is easy to confirm the unfilled mounds.
- the material of the transparent sheath 3 include a polyethylene resin, a vinyl chloride resin, a polypropylene resin, a polycarbonate resin, and a Teflon resin, and in particular, a material mainly composed of a polyethylene ionomer resin.
- the resin is a resin in which the carboxy group of the polymer with yS-unsaturated carboxylic acid is neutralized with a metal ion and the resin is skipped.
- the ionomer resin is a binary of ⁇ -olefin and ⁇ , 3-unsaturated carboxylic acid. It is a copolymer containing 5 to 20% by weight of S unsaturated carboxylic acid and having a degree of neutralization by metal ions of 10 to 90% by mole of an acid group. preferable.
- the transparent sheath is formed of one or a combination of two or more selected from the above materials, and the shape of the sheath 3 is formed to be the same as the sheath actually used at the construction site. Is desirable.
- the term “transparent” of the “transparent sheath” in the present invention means that, for example, the filling state of grout filled inside the sheath can be visually observed from outside the sheath.
- the term “transparent” may mean, for example, that the material is translucent, 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 the hollow portion, like a sheath. It fulfills the function of covering.
- the present invention is applied to an inner cable especially when a cable is buried in the concrete in a post tension type PC structure, and when a transparent sheath is used and the filled state of the grout in the sheath is not visible. This is effective when the outer cable of the PC structure having the box girder structure is used, that is, when the sheath made of black polyethylene is used.
- the concrete explanation of the injection method is as follows. After vacuuming the air in the cable sheath of the preceding test equipment, the grout discharge on-off valve is closed, the vacuum pump is stopped, and then the grout is injected. At the same time, the grouting method including the vacuum evacuation method is described for each process unit in which grout is injected from the grouting pipe into the transparent sheath by operating the pressure pump at the same time as the on-off valve for the grouting.
- the present invention operates continuously without stopping the vacuum pump on the exhaust side at one end of the cable sheath of the preceding test equipment.
- a continuous vacuuming method in which grout is continuously injected from the grout injection pipe by continuously operating the pump on the grout injection side at the other end is applied to the grout injection method. it can. Industrial applicability
- the influence factor is considered in various ways and the best is done.In fact, since the sheath is hidden by the cable inside the concrete box, it is checked whether the sheath is completely filled with grout. It was not possible to judge whether the cable completely filled with grout was completed, or whether the cable was incompletely filled with grout and the danger of corrosion and breakage of PC steel material. After completion, there was a bit of anxiety and danger.
- a cable for a preliminary test using a transparent sheath for the entire length of the cable that is, the incompletely filled portion and a short length of the cable
- a grout injection test was conducted with the preceding test equipment, and after confirming not only the situation during filling, but also the process from completion of filling to curing of the grout, and the filling situation after curing, the optimum conditions were selected. Since on-site construction can be performed, failure of incomplete filling of the grout does not occur, and an excellent post tension type PC structure can be provided.
- the grout injection test device by performing a preliminary test using the grout injection test device according to the present invention, it is possible to confirm a portion where the filling of the grout is likely to be incomplete in the sheath. In addition, it is possible to confirm that the grout is completely filled at the construction site.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Description
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/007846 WO2005116367A1 (ja) | 2004-05-31 | 2004-05-31 | ポストテンション方式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の注入工法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/007846 WO2005116367A1 (ja) | 2004-05-31 | 2004-05-31 | ポストテンション方式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の注入工法 |
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WO2005116367A1 true WO2005116367A1 (ja) | 2005-12-08 |
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PCT/JP2004/007846 WO2005116367A1 (ja) | 2004-05-31 | 2004-05-31 | ポストテンション方式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の注入工法 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102587674A (zh) * | 2012-03-14 | 2012-07-18 | 中国核工业华兴建设有限公司 | 预应力孔道灌浆方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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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2004
- 2004-05-31 WO PCT/JP2004/007846 patent/WO2005116367A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102587674A (zh) * | 2012-03-14 | 2012-07-18 | 中国核工业华兴建设有限公司 | 预应力孔道灌浆方法 |
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