CN1443723A - Grouting material and vacuum grouting process in prestressed concrete engineering - Google Patents
Grouting material and vacuum grouting process in prestressed concrete engineering Download PDFInfo
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- CN1443723A CN1443723A CN 03116384 CN03116384A CN1443723A CN 1443723 A CN1443723 A CN 1443723A CN 03116384 CN03116384 CN 03116384 CN 03116384 A CN03116384 A CN 03116384A CN 1443723 A CN1443723 A CN 1443723A
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Abstract
The present invention relates to a grouting material and its vacuum grouting process in the prestressed concrete engineering. Said grouting material is fomed from 65-90 wt% of cement, 35-10 wt% of auxiliary material and proper quantity of water. Said auxiliary material is a special one formed from aluminosilicate ore powder, calcium thioaluminate ore powder and adjuvant. Said grouting material is good in workability, low in porosity, high in strength and strong in durability. Its vacuum grouting process includes the following three steps: evacuating, evacuating and grouting and grouting.
Description
Technical field
The present invention relates to the building operation grouting technique, especially about injection material and the vacuum grouting technology in prestressed concrete engineering.
Background technology
Prestressed concrete has become a kind of crucial structured material in the civil engineering through the development of nearly half a century in China.Range of application enlarges day by day, and single layer structure and tier building, highway and railroad bridge etc. by in the past expand present Highrise buildings, hypogee, tall and slender structure, steel construction, Nuclear power plants and pressurized vessel etc. to.From the pretensioning method to the post stretching, do not have bonding from being bonded to, from the body to external, prestressing technique has obtained very big development.
At present, the bonded prestress structure all adopts the pressure grouting method after stretch-draw is finished, and makes presstressed reinforcing steel and member produce effectively bonding, thereby makes presstressed reinforcing steel and member form acting in conjunction.This traditional grouting method very easily causes the eakiness of duct grouting.This major cause be since in filling process paste materials and duct contain a large amount of bubbles, after solidifying and shrink, slurry will unavoidably produce many holes, and these holes often just become the gathering ground of water or other objectionable impurities, prestressing steel is produced corrosion, make engineering leave serious hidden danger of quality.In recent years, in the prestress engineering at home and abroad, the quality problems owing to prestressed pore passage grouting all take place, and cause serious engineering accident.For example, adopt the Britain Ynys-Gnas bridge of pressure grouting just to collapse because presstressed reinforcing steel is corroded.The oblique stressing bridge of China's Guangdong Province's prestress because the problem of injection material causes the presstressed reinforcing steel corrosion, causes the prestressed cable system in using less than quinquenniad and all change.
The problems referred to above at traditional pressure grouting existence, generally adopt a kind of vacuum grouting novel process abroad in the bonded prestress engineering, the elementary operation of vacuum grouting technology comprise select the material of boxing out for use, select grout machine equipment for use, the preparation injection material, vacuumize, step such as mud jacking.This technology all adopts the plastic film capicitor material of boxing out usually, because plastic ripple thickness of pipe, bleeding vent fittings size are bigger, should be used for being embedded in municipal bridge tower and anchor ingot prestressed concrete, as be used for the building structure beam slab and then be difficult for the discharging reinforcing bar, and the environment for use temperature of plastic film capicitor is unsuitable too high, and the building structure fire resistance is produced certain influence.Therefore, develop a kind of new injection material and good seal performance, the vacuum grouting technology that fire resistance is good, can be in building and municipal bridge construction the technology of dual-purpose, be significant.
Summary of the invention
The invention provides injection material and the vacuum grouting technology in prestressed concrete engineering.
The injection material that the vacuum grouting arts demand is suitable, this is an important step finishing vacuum grouting technology.The ash material that injection material of the present invention is made up of the grouting auxiliary material of the cement of 65-90 weight % and 35-10 weight %, water cement ratio is 1 in addition again: the water of 0.25-0.35 is formed, preferable water cement ratio is 1: 0.28-0.32, cement select 42.5R general in the present construction work above general silicon or silicate cement for use.The grouting auxiliary material is in order to improving the over-all properties of vacuum grouting material, to consider the easy control of the operability and the quality of practice of construction, therefore by following prescription multiple auxiliary material is processed to form special-purpose grouting auxiliary material, its form and content as follows:
Component concentration (weight %)
Silico-aluminate breeze 0-30
Calcium sulphoaluminate breeze 60-90
Auxiliary agent 5-15
The silico-aluminate breeze mainly plays regulating effect to injection material intensity, and it can be ca aluminosilicate breeze or silicoaluminate powdered iron ore etc.Breeze granularity＞45 μ m are no more than 20%, all the other granularities≤80 μ m.
The calcium sulphoaluminate breeze in injection material as the volume-adjustment agent.Breeze granularity＞45 μ m are no more than 20%, all the other granularities≤80 μ m.
Auxiliary agent mainly includes grinding aid, tensio-active agent, exciting agent, can therefrom select one or more mixture for use.Grinding aid can be trolamine, diethanolamine or monoethanolamine etc., and tensio-active agent can be β-naphthalene sulfonate formaldehyde condensation products, the fatty acid polyethylene ether sulfate, and polycarboxylates etc. mainly have been water-reduction in injection material.Exciting agent can be a calcium sulfate, and calcium oxide etc. work the composition activity effect that excites in the material filling material.
The production method of injection material of the present invention
(1) production of special-purpose grouting auxiliary material
At first multiple auxiliary material is carried out mix grinding by above-mentioned formula combination, the mix grinding rotating speed is 15-20 rev/min, until mix grinding granularity≤30 μ m, promptly is formed for the special use grouting auxiliary material of the vacuum grouting in the prestressed concrete engineering.
(2) the on-the-spot stirring produced the vacuum grouting material
With cement, grouting auxiliary material and water are by above-mentioned prescription and water cement ratio combination, and evenly stirred 1-3 hour in stirrer at the scene, and the slurry degree of mobilization after the stirring is controlled at 250 ± 5mm, and the slurry of production should in time water use.
The injection material that the present invention is produced carries out The performance test results and tabulates 1 and table 2 as follows.
Table 1 injection material proportional quantity
Annotate: A, B respectively test the grouting material for the present invention, and C is the reference cement slurry
The performance of table 2 injection material test
| Test event | Performance | Unit | Numbering | ||
| ????A | ????B | ????C | |||
| Flowing property | Degree of mobilization | ??mm | ????255 | ????245 | ????220 |
| Bleeding rate | ??％ | ????0.2 | ????0.3 | ????3.1 | |
| Time of coagulation | Initial set | ??hr∶min | ????2∶20 | ????1∶55 | ????2∶15 |
| Final set | ??hr∶min | ????3∶35 | ????3∶20 | ????3∶45 | |
| Mechanical property (mark is supported) | 24h ultimate compression strength | ??Mpa | ????13.7 | ????33.2 | ????5.6 |
| The 24h folding strength | ??Mpa | ????3.6 | ????7.1 | ????2.1 | |
| 7d ultimate compression strength | ??Mpa | ????48.6 | ????60.4 | ????24.4 | |
| The 7d folding strength | ??Mpa | ????5.2 | ????9.2 | ????3.6 | |
| 28d ultimate compression strength | ??Mpa | ????64.4 | ????73.0 | ????42.1 | |
| The 28d folding strength | ??Mpa | ????8.7 | ????10.5 | ????5.2 | |
| 60d ultimate compression strength | ??MPa | ????68.2 | ????79.0 | ????44.2 | |
| The 60d folding strength | ??MPa | ????＞11.7 | ????＞11.7 | ????5.8 | |
| Deformation performance (in the water) | The 14d limited expansion rate | ??％ | ????0.023 | ????0.018 | ????0.004 |
| The 28d limited expansion rate | ??％ | ????0.025 | ????0.022 | ????0.008 | |
| Endurance quality | Action of rust to reinforcing bar | Passivation | Passivation | Passivation | |
The testing method of each test event is as follows:
Flowing property selects for use GB8077-1999 " flowing degree of net paste of cement test method " to measure the degree of mobilization of injection material.
Bleeding rate is with reference to the measuring method of U.S. post-tensioned prestressed concrete association for the concrete grouting bleeding rate, adopts and contains a certain amount of slurry in the 25ml graduated cylinder, takes the measure that prevents that moisture evaporation is scattered and disappeared, measures the bleeding rate of slurry
Press the test of GB1346-89 method time of coagulation.
Mechanical property is pressed the GB177-85 method, with the ultimate compression strength and the folding strength of the test specimen testing size test specimen of 40 * 40 * 160mm.
Endurance quality is with reference to the action of rust of GB8076-1997 method testing size to reinforcing bar.
Deformation performance is with reference to the limited expansion rate and the degree of free swelling of JC476-2001 " cement expansive material " testing size.
Table 1 and table 2 show that the water cement ratio of injection material of the present invention is obviously low than the reference cement slurry, and its degree of mobilization meets the requirement of 250 ± 5mm (in conjunction with the pre-stress construction experience, pilot scale and engineering effect, when the degree of mobilization of grouting material is 250 ± 5mm, its construction effect is best, and bleeding rate is minimum).Bleeding rate is much lower than the reference cement slurry also, time of coagulation then with being close of reference cement slurry.
From intensity, the intensity of injection material of the present invention wants big than the intensity of reference cement slurry, and ultimate compression strength can reach about 10-30MPa in 24 hours, and ultimate compression strength can reach about 40-60MPa in 7 days, and ultimate compression strength can reach about 60-70MPa in 28 days.
The steel bar corrosion test shows that injection material of the present invention is identical with the reference cement slurry, can cause the reinforcing bar passivation, and the protection reinforcing bar is avoided the erosion action of corrosive medium.
Deformation performance test shows, the limited expansion rate of injection material of the present invention illustrate that all greater than 0 it has the compensate for shrinkage effect, the then basic no change of reference water mud.
The vacuum grouting technology is a new technology in the post-tensioned concrete structure construction.The elementary operation of vacuum grouting technology of the present invention is at first to select metallic bellows box out material and screw grout machine equipment for use, and the dress ground tackle is equipped with a ground tackle sealing protective simultaneously in end, vacuum grouting duct.Before the duct grouting of prestressed concrete, adopt the air in the vacuum apparatus suction duct, make the negative pressure about formation-0.1MPa in the duct, the invention described above slurry is pressed into the 0.5-0.7MPa positive pressure at the duct the other end then, because air is got rid of in a large number in the duct, to exist positive/negative pressure poor for duct and mud jacking in filling process, so just makes that slurry is difficult to form bubble in the duct, thereby reach the full closely knit effect of grouting back duct entoplasm body.
Vacuum grouting technology of the present invention has following characteristics:
1, is vacuum → vacuum+grouting → uninterrupted technology of grouting three-step approach
The first step adopts air in the vacuum apparatus suction duct, make in the duct to reach-0.09～0.1MPa negative pressure, second step was carried out pressure grouting at the duct the other end with the 0.5-0.7MPa positive pressure, when the slurry of waiting to be in the milk is flowed through by vision slit continuing to vacuumize down then, expression duct entoplasm material is filled, promptly entered for the 3rd step, stop to vacuumize, grouting continues to keep-up pressure, about 10-60 is after second, and grouting finishes.
2, use injection material of the present invention to carry out vacuum grouting.
3, adopt metallic bellows to box out, the grouting system favorable sealing property that adopts metallic bellows to box out is boxed out conveniently, and fire resistance is good.
4, add in the end, duct that ground tackle is housed and join the ground tackle sealing protective
After the member prestressed stretch-draw is finished; generally in end, vacuum grouting duct ground tackle is housed, the present invention reaches full closeding state technically in order to make duct and end, satisfies the vacuum tightness requirement of vacuum grouting; add in the end, duct and to join a Special ground tackle sealing protective, its structure is seen Fig. 1.The Special ground tackle sealing protective comprises base 1, seal washer 5 and protection cover body 2; earlier base 1 and ground tackle are installed on the end, duct simultaneously; ground tackle is attached on the base 1; after prestressed stretch-draw and the cutting of unnecessary steel strand are finished; to protect cover body 2 to be tightened on the base 1, place seal washer 5 under seam on the seal washer 9 and the seal washer between the seam 10.To protect the slurry port lid 4 that emits on the cover body 2 to cover before the aspiration vacuum earlier; aspiration vacuum then; the other end is in the milk in the duct; (expression duct entoplasm material is filled) opened and emitted slurry hole 3 when the slurry of waiting to be in the milk was flowed through by the vision slit that is located at the other end; stop again vacuumizing; keep-up pressure grouting 10-60 after second, and grouting finishes.Because this Special ground tackle sealing protective favorable sealing property; therefore not only satisfied the vacuum tightness requirement of vacuum grouting; play simultaneously the effect of prestressed anchor being carried out the permanent seal protection again; cause the blow-by of end, duct after having overcome traditional water mud sealing off and covering anchorage, and make ground tackle that corrosion take place and cause influencing the defective of construction quality.
5, adopt the screw grout machine
Because the vacuum grouting process is a continuous and continual process, in order to reach the totally-enclosed process of inhaling slurry → grouting, adopt advanced screw grout machine, this machine is because slurry is at the uniform velocity to be advanced by screw rod in annular seal space, can not cause air to infiltrate, and operational throughput is even.So just overcome piston-type grout machine commonly used in grouting works, in slurry, formed the defective of a large amount of bubbles, thereby improved the quality of grouting.
Advantage of the present invention:
The invention provides good injection material, advantage such as it is good to have workability, and porosity is low, and perviousness is little, and intensity is higher, and weather resistance is strong.Require to have low water cement ratio down meeting degree of mobilization 250 ± 5mm, be 1: therefore 0.25-0.35, bleeding rate can eliminate and disintegrate also below 0.5%, the porosity of reduction hydrated cement paste.The intensity of hardened paste is also higher, and ultimate compression strength can reach about 10-30MPa in 24 hours, can satisfy engineering in early days for the requirement of stretch-draw time, and ultimate compression strength can reach about 60-70MPa in 28 days.And have the shrinkage strain effect of compensation slurry in the setting and harden process, thereby help the density that bonds between slurry and the deformed bar.
The present invention also provides the prestressed concrete engineering vacuum grouting technology of using injection material of the present invention; be vacuum → vacuum+grouting → uninterrupted technology of grouting three-step approach; and adopt the metallic bellows with fire resistance box out material and screw grout machine; reach the totally-enclosed process of inhaling slurry → grouting; add again and join the ground tackle sealing protective, guarantee the sealing property of grouting system.Be can be in building and municipal bridge construction the technology of dual-purpose.This vacuum grouting technology shows in the application example of prestressed concrete engineering, the technology utilization is reliable, respond well, duct, grouting back entoplasm body is closely knit full, even no bubble, presstressed reinforcing steel has higher-strength and rust protection weather resistance, thereby improves construction quality, eliminate accident potential, have very big economic benefit and social benefit.
Description of drawings
Fig. 1 is the Special ground tackle sealing protective STRUCTURE DECOMPOSITION synoptic diagram that adopts in the prestressed concrete engineering vacuum grouting technology of the present invention.
Embodiment
The production of embodiment 1 grouting auxiliary material
With calcium sulphoaluminate breeze 8t, β-Nai sodium sulfonate formaldehyde condensation products 0.6t and trolamine 0.4t insert and carried out mix grinding in the mixer-mill 30 minutes, the mix grinding rotating speed is 20 rev/mins, add ca aluminosilicate breeze 1.5t more gradually, continued mix grinding 2 hours, treat that the mix grinding material granularity reaches≤30 μ m, discharging, auxiliary material must be in the milk.
Embodiment 2 on-the-spot stirrings are produced the vacuum grouting material
Get 100t conch P.O42.5 silicate cement, the grouting auxiliary material that 43t embodiment 1 produces is done and was stirred 5 minutes, slowly add entry 41.5t (water cement ratio is 1: 0.29) then, stirred 20 minutes, get final product discharging after mixing thoroughly, evenly the slurry degree of mobilization that stirs is controlled at 250 ± 5mm, in time uses in following embodiment 3.
Embodiment 3 certain building prestressed concrete engineering member vacuum grouting test
Member adopts double wave galvanized metal corrugated tube to box out after prestressed stretch-draw is finished, and specification is φ 70mm; orifice throat length is 15m, is two and strides the broken line layout, and three ducts are set; select J2GG type screw grout machine simultaneously for use, ground tackle and ground tackle sealing protective are installed in the end, duct.Before the duct grouting, adopt the air of vacuum apparatus in duct one end suction duct, make the negative pressure about formation-0.1MPa in the duct, continuing to vacuumize at the duct the other end with the 0.5-0.7MPa positive pressure embodiment 2 on-the-spot vacuum grouting material of producing that stir to be carried out pressure grouting then, the performance of injection material sees Table 3.When treating that slurry is flowed through by vision slit, expression duct entoplasm material is filled, stops to vacuumize, and continues to keep-up pressure after about 30 seconds kinds of grouting, and grouting finishes.Duct, grouting back entoplasm body is closely knit, evenly full.
Table 3
| Test event | Performance | Unit | Test value |
| The fluidity of slurry energy | Degree of mobilization | ????mm | ????250 |
| Bleeding rate | ????％ | ????0.2 | |
| Time of coagulation | Initial set | ????hr∶min | ????2∶38 |
| Final set | ????hr∶min | ????3∶40 | |
| Mechanical property (mark is supported) | 24h ultimate compression strength | ????MPa | ????11.6 |
| 7 days ultimate compression strength | ????MPa | ????44.7 | |
| 28 days ultimate compression strength | ????Mpa | ????61.0 | |
| Deformation performance | The 3d degree of free swelling | ????％ | ????0.119 |
| The 7d degree of free swelling | ????％ | ????0.201 | |
| The 28d degree of free swelling | ????％ | ????0.300 | |
| Weather resistance | To the steel bar corrosion effect | Passivation | |
| Vacuum tightness | The 1# duct | ????MPa | ????0.09 |
| The 2# duct | ????MPa | ????0.95 | |
| The 3# duct | ????MPa | ????0.10 | |
| Grouting pressure | The 1# duct | ????MPa | ????0.6～0.7 |
| The 2# duct | ????MPa | ????0.6～0.7 | |
| The 3# duct | ????MPa | ????0.6～0.7 |
Claims (7)
1, a kind of injection material is characterized in that the ash material be made up of the grouting auxiliary material of the cement of 65-90 weight % and 35-10 weight %, and water cement ratio is 1 in addition again: the water of 0.25-0.35 is formed,
The composition and the content of grouting auxiliary material are as follows:
Component concentration (weight %)
Silico-aluminate breeze 0-30
Calcium sulphoaluminate breeze 60-90
Auxiliary agent 5-15
Auxiliary agent comprises and helps grinding agent, tensio-active agent, exciting agent, can therefrom select one or more mixture for use.
2, injection material as claimed in claim 1 is characterized in that described water cement ratio is 1: 0.28-0.32.
3, injection material as claimed in claim 1 is characterized in that described silico-aluminate breeze can be ca aluminosilicate breeze or silicoaluminate powdered iron ore.
4, injection material as claimed in claim 1 is characterized in that described grinding aid can be trolamine, diethanolamine or monoethanolamine.
5, injection material as claimed in claim 1 is characterized in that described tensio-active agent can be β-naphthalene sulfonate formaldehyde condensation products, fatty acid polyethylene ether sulfate or polycarboxylate.
6, injection material as claimed in claim 1 is characterized in that described exciting agent can be calcium sulfate or calcium oxide.
7, use the prestressed concrete engineering vacuum grouting technology of the described injection material of claim 1, comprise and select the material of boxing out for use, select grout machine equipment for use, the preparation injection material, vacuumize, the mud jacking step, it is characterized in that described vacuum grouting technology is vacuum → vacuum+grouting → uninterrupted technology of grouting three-step approach, it is the first step suction duct, make in the duct to reach-0.09～0.1MPa negative pressure, second step was continuing to vacuumize down then, carry out pressure grouting at the duct the other end with the 0.5-0.7MPa positive pressure, when treating that slurry is flowed through by vision slit, promptly entered for the 3rd step, stop to vacuumize, continue to keep-up pressure grouting 10-60 after second, grouting finishes, in the technology:
Use the described injection material of claim 1 to carry out vacuum grouting;
The employing metallic bellows is boxed out;
Add in the end, duct that ground tackle is housed and to join the ground tackle sealing protective;
Adopt the screw grout machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03116384 CN1443723A (en) | 2003-04-14 | 2003-04-14 | Grouting material and vacuum grouting process in prestressed concrete engineering |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03116384 CN1443723A (en) | 2003-04-14 | 2003-04-14 | Grouting material and vacuum grouting process in prestressed concrete engineering |
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| CN1443723A true CN1443723A (en) | 2003-09-24 |
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| CN 03116384 Pending CN1443723A (en) | 2003-04-14 | 2003-04-14 | Grouting material and vacuum grouting process in prestressed concrete engineering |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206062A (en) * | 2011-03-31 | 2011-10-05 | 浙江五龙化工股份有限公司 | Post-tensioned and pre-stressed pipe grouting agent |
| CN103603273A (en) * | 2013-11-04 | 2014-02-26 | 沈阳市政集团有限公司 | Method for grouting construction of prestressed pipe |
| CN107700850A (en) * | 2017-10-09 | 2018-02-16 | 浙江宏超建设集团有限公司 | Post stretching bonded prestress engineering construction process |
| CN108104474A (en) * | 2018-01-05 | 2018-06-01 | 广州华土建筑工程技术有限公司 | A kind of high-pressure grouting construction method expected using steel construction and CGM |
| CN108360821A (en) * | 2018-02-07 | 2018-08-03 | 上海建工二建集团有限公司 | A kind of construction method of beam |
| CN108776197A (en) * | 2018-06-21 | 2018-11-09 | 上海新如生物科技有限公司 | Device and method for the expansion character for testing vacuum filling cosmetics material body |
-
2003
- 2003-04-14 CN CN 03116384 patent/CN1443723A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206062A (en) * | 2011-03-31 | 2011-10-05 | 浙江五龙化工股份有限公司 | Post-tensioned and pre-stressed pipe grouting agent |
| CN103603273A (en) * | 2013-11-04 | 2014-02-26 | 沈阳市政集团有限公司 | Method for grouting construction of prestressed pipe |
| CN107700850A (en) * | 2017-10-09 | 2018-02-16 | 浙江宏超建设集团有限公司 | Post stretching bonded prestress engineering construction process |
| CN108104474A (en) * | 2018-01-05 | 2018-06-01 | 广州华土建筑工程技术有限公司 | A kind of high-pressure grouting construction method expected using steel construction and CGM |
| CN108360821A (en) * | 2018-02-07 | 2018-08-03 | 上海建工二建集团有限公司 | A kind of construction method of beam |
| CN108776197A (en) * | 2018-06-21 | 2018-11-09 | 上海新如生物科技有限公司 | Device and method for the expansion character for testing vacuum filling cosmetics material body |
| CN108776197B (en) * | 2018-06-21 | 2024-04-23 | 上海新如生物科技有限公司 | Device and method for testing the expansion properties of a vacuum-filled cosmetic body |
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