CN103321420A - Vacuum-assisted grouting device and method for gamma-type prestressed pipes - Google Patents
Vacuum-assisted grouting device and method for gamma-type prestressed pipes Download PDFInfo
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- CN103321420A CN103321420A CN2013102585180A CN201310258518A CN103321420A CN 103321420 A CN103321420 A CN 103321420A CN 2013102585180 A CN2013102585180 A CN 2013102585180A CN 201310258518 A CN201310258518 A CN 201310258518A CN 103321420 A CN103321420 A CN 103321420A
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Abstract
The invention relates to a vacuum-assisted grouting device for gamma-type prestressed pipes and a vacuum-assisted grouting method for gamma-type prestressed pipes, and belongs to the technical field of building engineering. The device comprises group caps, a vacuum line, and at least one valve control three-way connector. The grout caps for communicating grout pumps with a gamma-type prestressed pipe are disposed at two ends of the gamma-type prestressed pipe. The vacuum line is led out of a vertical segment and arc segment joint of the gamma-type prestressed pipe. The valve control three-way connector is disposed on an arc segment higher than the joint. The vacuum line is connected with a vacuum pump through a sedimentation separator. The vacuum-assisted grouting device and method for gamma-type prestressed pipes has the advantages that high-quality grouting is guaranteed, construction period is shortened evidently, construction cost is saved and operation is facilitated.
Description
Technical field
The present invention relates to a kind of provisions for grouting, especially a kind of gamma shape prestressing pipeline vacuum is assisted provisions for grouting, also relates to simultaneously corresponding grouting method, belongs to construction engineering technical field.
Background technology
Need to pour into the thixotroping slurry in the gamma steel beam tube road in the EPR nuclear island of nuclear power station civil works inner containment 55C15 pre-stress system, because it is large that its pipe trunk is long, transverse bending rises and falls, and steel stranded wire penetrating adapter quantity wherein is many, so the closely knit suitable difficulty that has that will guarantee to be in the milk, be easy to occur bubble and space.For the compactness that guarantees to be in the milk, avoid bubble and space, adopt for a long time the perfusion of back-grouting method always, namely carry out first the perfusion of slow setting slurry, blow slurry after finishing, blow slurry at every turn and blow at least 2 to 3 times, after grouting is finished first, carried out secondary pouring in 4 to 7 days, time-consuming.And back-grouting adopts the slurry that expands usually, and the slurry that expands is highstrung slurry, and is quite responsive to environment temperature and material temperature, and toos many or too much for use in 30min and just need scrap, and therefore construction condition and constructor's qualification had quite high requirement.
Summary of the invention
The object of the invention is to: for the problem of above-mentioned prior art existence, a kind of can the assurance under the grouting quality prerequisite proposed, the disposable vacuum-assisted provisions for grouting of finishing the grouting of gamma shape prestress pipe, provide simultaneously its grouting method, thereby significantly improve operating efficiency, reduce the building operations cost.
In order to reach above purpose, the auxiliary provisions for grouting of gamma shape prestressing pipeline vacuum of the present invention comprises the grout cap that is placed in gamma shape prestress pipe two ends connection grout pump and gamma shape prestress pipe, comprise that also described vacuum line connects vacuum pump through the precipitate and separate device by vertical section vacuum line and at least one valve control three-way interface in the segmental arc setting that is higher than described junction of drawing with the segmental arc junction of gamma shape prestress pipe.
The grouting basic step of the auxiliary provisions for grouting of gamma shape prestressing pipeline vacuum of the present invention is as follows:
The first step, allotment cement paste---add retarding agent in the cement that Jiang Jiashui stirs, retarding agent is 1.8%-2.2% with the weight of cement ratio, obtains the slow setting slurry;
The grout pump of second step, vertical section lower end of startup until the three-way interface place of opening has slurry to overflow, cuts out the grout pump of vertical section lower end of gamma shape prestress pipe to vertical section perfusion slow setting slurry;
The 3rd step, leave standstill 6-12 hour after, gases at high pressure are accessed three-way interface, three-way interface to the slow setting of described junction slurry is blown out by vacuum line;
The 4th step, the slow setting that will stir add thixotropic agent in starching, and thixotropic agent is 0.5%-1.5% with the weight of cement ratio, obtains the thixotroping slurry;
The 5th goes on foot, closes all valves of gamma shape prestress pipe to be in the milk, makes it be in closed state, and opens vacuum pump, and pressure stability arrives-95%(best-90% at one atmospheric-80%);
The grout pump of the 6th step, startup gamma shape prestress pipe segmental arc termination is to segmental arc perfusion thixotroping slurry, until vacuum line has slurry to overflow.
The present invention further improves, and the outlet section of described grout cap sprue has the branch's runner that extends backwards, and the rear end of described branch runner and sprue also connects grout pump.So not only help to guarantee the grouting flow, and can form jet effect, improve filling speed.
The present invention further improves, and described vacuum line has the sampling branch line of valve control, and connects the precipitate and separate device through transparent pipe.
Adopt the present invention to have following remarkable advantage:
1. having guaranteed high-quality grouting effect---the characteristic of thixotroping slurry makes the mobility of slurry highly stable, even also can slump in pipeline peak position, cooperates vacuum grouting again, can effectively prevent from wrapping up gas, has guaranteed the closely knit effect of grouting.
2. obvious reduction of erection time---need secondary to fill with to expand the technique of slurry to compare with tradition, the grouting of vacuum-assisted thixotroping slurry does not need to blow slurry and back-grouting, can one-shot forming, therefore greatly reduced operation, and shortened the duration.
3. saving construction cost---owing to having reduced working procedure, need not the input of secondary agitation material and facility, improved operating efficiency, therefore optimized resource distribution, saved cost.
4. easy and simple to handle---having reduced the people is the probability of makeing mistakes, can be handling strong, be conducive to quality control.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of one embodiment of the invention.
The specific embodiment
Embodiment one
The gamma shape prestress pipe thixotroping slurry vacuum-assisted provisions for grouting of the present embodiment as shown in Figure 1, comprise and be placed in grout cap A and the B that gamma shape prestress pipe 1 two ends are communicated with grout pump and gamma shape prestress pipe, also comprise by vertical section of gamma shape prestress pipe and segmental arc junction, the vacuum line 2 of being drawn by threeway E2, and the valve control three-way interface E3 that arranges at the segmental arc that is higher than the junction and the valve control three-way interface E4 that arranges at the segmental arc peak.Threeway E2 to the distance of three-way interface E3 be 8-10 rice.Vacuum line 2 has the sampling branch line 3 of valve V2 control, and connects vacuum pump by the transparent pipe 4 behind the valve V1 through the precipitate and separate device.The outlet section of the sprue of grout cap A, B has respectively backwards the runner A2 of branch, the B2 that extends, and rear end A1, the B1 of branch's runner and separately sprue and grout pump corresponding to connection.A4, B4 are steam vent.
The vacuum-assisted filling process of the present embodiment gamma shape prestress pipe is as follows:
The first step, allotment cement paste---add rich this happy SP337 retarding agent (the happy RP264 of Fu Si or Grace ADVA 161C, 165C also can) in the PII42.5 cement that Jiang Jiashui stirs, retarding agent is about 2% with the weight of cement ratio, obtains the slow setting slurry.
The grout pump of second step, vertical section lower end of startup to vertical section perfusion slow setting slurry, until the E3 of three-way interface place that opens has slurry to overflow, cuts out the grout pump of vertical section lower end of gamma shape prestress pipe by grout cap A.
The 3rd step, at least leave standstill 6 hours (usually should not above 12 hours) after, gases at high pressure are accessed three-way interface E3, this three-way interface is starched to the slow setting of junction E3 is blown out by vacuum line 2.
The 4th step, will add polyamide thixotropic agent (or the cemethix of polyacrylamide thixotropic agent, resipoly etc.) in the slow setting that the stir slurry, thixotropic agent is about 1% with the weight of cement ratio, obtains the thixotroping slurry.
The 5th goes on foot, closes all valves of gamma shape prestress pipe to be in the milk, makes it be in closed state, and opens vacuum pump, and pressure stability is at one atmospheric-90%.
The grout pump of the 6th step, startup gamma shape prestress pipe segmental arc termination is starched segmental arc perfusion thixotroping by grout cap B, until vacuum line 2 has slurry to overflow.
The 7th step, open sampling branch line 2, to the slurry sampling of flowing out, measure the slurry denseness, as reach 120cn.m(and be no more than 350cn.m), the grout pump of then closing vertical section lower end of gamma shape prestress pipe; Otherwise continue grouting, until denseness qualified till.
Facts have proved, behind employing the present embodiment
1) can guarantee high-quality grouting effect.Because be paste behind the thixotroping slurry pulping, flowability and self repairing ability, when slurry was subject to shearing, denseness diminished, and shearing force is larger, and the denseness loss is larger.When stopping to shear, denseness increases again.This performance of thixotroping slurry, make the mobility of slurry highly stable, can slump in pipeline peak position, cooperate again with vacuum grouting, keep vacuum pump in running order between the pustulation period, because atmospheric pressure is not identical with pipeline air pressure, therefore slurry flows forward, and the eddy flow of any generation bubble can not occur, can prevent from wrapping up in the slurry gas, reduced in a large number the quantity of bubble, good slurry performance guarantee high-quality grouting effect.
2) be conducive to the reduction of erection time.Original dome pipeline need to be emptying with the slurry of top bleeding after the grouting of slow setting slurry, then fills with the grouting that the slurry that expands is finished whole pipeline by secondary.And the grouting of vacuum-assisted thixotroping slurry does not need to blow slurry and back-grouting owing to the characteristic of slurry self and grouting process, and therefore one-shot forming has reduced operation, has shortened the duration, has improved operating efficiency, has greatly optimized resource distribution.
3) saved construction cost.Blow the minimizing of slurry and back-grouting operation, directly reduced corresponding man-hour, reduced the input of secondary agitation material and facility, saved cost.In addition, the shortening of duration helps to save construction cost.
4) operating procedure is simple.Because slurry and technique itself do not need to carry out slow setting slurry grouting outlet exhaust, entrance exhaust, blow the operational motions such as slurry, back-grouting, having reduced the people is the probability of makeing mistakes, and is conducive to quality control.
The slurry perfusion of the gamma steel bundle dome section that the prestressing force thixotroping slurry vacuum grouting device of the present embodiment and grouting method are applied to nuclear power station EPR pre-stress system, there are 104 of Gamma pipes in this system, internal diameter of the pipeline is 160mm, average every long 109.3m of pipeline, amount to length 11366.899m, the grouting amount is 142m
3Steel strand distribute closelyer in 54 of the every pipeline lashing steel strand, pipeline, add that pipeline fluctuation is large, Gamma pipe dome section 17.245m, and span reaches 46.254m, has brought acid test therefore for the closely knit effect of grouting.Adopted the traditional slow setting slurry grouting process trouble of not only constructing in the past, and be difficult to satisfy the requirement of slurry compactness, adopt thixotroping slurry after this enforcement to add the grouting technique of vacuum-assisted, then make the dome pipe that extraordinary grouting effect is arranged, can guarantee to significantly improve work efficiency under the prerequisite of grouting quality.The invention is not restricted to the nuclear power construction technical field, also may extend to other industry and civilian construction grouting construction.
Claims (6)
1. a gamma shape prestressing pipeline vacuum is assisted provisions for grouting, it is characterized in that: comprise being placed in the grout cap that gamma shape prestress pipe two ends are communicated with grout pump and gamma shape prestress pipe, comprise that also described vacuum line connects vacuum pump through the precipitate and separate device by vertical section vacuum line and at least one valve control three-way interface in the segmental arc setting that is higher than described junction of drawing with the segmental arc junction of gamma shape prestress pipe.
2. prestressing force vacuum-assisted provisions for grouting according to claim 1 and grouting method is characterized in that: the outlet section of described grout cap sprue has the branch's runner that extends backwards, and the rear end of described branch runner and sprue also connects grout pump.
3. prestressing force vacuum-assisted provisions for grouting according to claim 2 and grouting method is characterized in that: described vacuum line has the sampling branch line of valve control, and connects the precipitate and separate device through transparent pipe.
4. prestressing force vacuum-assisted provisions for grouting according to claim 3 and grouting method, it is characterized in that: vacuum line is drawn by threeway in described junction, and described three distances that pass to three-way interface are 8-10 rice.
5. adopt the grouting method of the described prestressing force vacuum-assisted of claim 1 provisions for grouting, it is characterized in that comprising the steps:
The first step, allotment cement paste---add retarding agent in the cement that Jiang Jiashui stirs, retarding agent is 1.8%-2.2% with the weight of cement ratio, obtains the slow setting slurry;
The grout pump of second step, vertical section lower end of startup until the three-way interface place of opening has slurry to overflow, cuts out the grout pump of vertical section lower end of gamma shape prestress pipe to vertical section perfusion slow setting slurry;
The 3rd step, leave standstill 6-12 hour after, gases at high pressure are accessed three-way interface, three-way interface to the slow setting of described junction slurry is blown out by vacuum line;
The 4th step, the slow setting that will stir add thixotropic agent in starching, and thixotropic agent is 0.5%-1.5% with the weight of cement ratio, obtains the thixotroping slurry;
The 5th goes on foot, closes all valves of gamma shape prestress pipe to be in the milk, makes it be in closed state, and opens vacuum pump, and pressure stability is at one atmospheric-80% to-95%;
The grout pump of the 6th step, startup gamma shape prestress pipe segmental arc termination is to segmental arc perfusion thixotroping slurry, until vacuum line has slurry to overflow.
6. the grouting method of described prestressing force vacuum-assisted provisions for grouting according to claim 5 characterized by further comprising:
The 7th step, unlatching sampling branch line to the slurry sampling of flowing out, are measured the slurry denseness, as are reached 120cn.m, then close the grout pump of vertical section lower end of gamma shape prestress pipe; Otherwise continue grouting, until denseness qualified till.
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Cited By (6)
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| 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 |
| CN106286240A (en) * | 2016-10-15 | 2017-01-04 | 中国铁道科学研究院铁道建筑研究所 | A kind of single-ended automatic vacuum of prestress pipe and mud jacking system and technique thereof |
| CN108517783A (en) * | 2018-04-28 | 2018-09-11 | 中交航局第工程有限公司 | A kind of 200m box beams duct relay grouting process |
| CN114150873A (en) * | 2021-11-18 | 2022-03-08 | 东南大学 | Grouting device and grouting method for sleeve grouting |
| CN114645619A (en) * | 2022-03-31 | 2022-06-21 | 中国核工业华兴建设有限公司 | Construction method for integrally drawing Gamma steel bundle stranded wire of containment vessel of nuclear power station |
| CN116905813A (en) * | 2023-07-17 | 2023-10-20 | 中冶检测认证有限公司 | Inverted U-shaped prestress steel beam pouring system and method for containment vessel of nuclear power station |
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| CN108517783A (en) * | 2018-04-28 | 2018-09-11 | 中交航局第工程有限公司 | A kind of 200m box beams duct relay grouting process |
| CN108517783B (en) * | 2018-04-28 | 2020-08-04 | 中交一航局第一工程有限公司 | Relay grouting process for 200m box girder channel |
| CN114150873A (en) * | 2021-11-18 | 2022-03-08 | 东南大学 | Grouting device and grouting method for sleeve grouting |
| CN114645619A (en) * | 2022-03-31 | 2022-06-21 | 中国核工业华兴建设有限公司 | Construction method for integrally drawing Gamma steel bundle stranded wire of containment vessel of nuclear power station |
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| CN116905813A (en) * | 2023-07-17 | 2023-10-20 | 中冶检测认证有限公司 | Inverted U-shaped prestress steel beam pouring system and method for containment vessel of nuclear power station |
| CN116905813B (en) * | 2023-07-17 | 2024-06-14 | 中冶检测认证有限公司 | Inverted U-shaped prestress steel beam pouring system and method for containment vessel of nuclear power station |
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