CN103321420B - 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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- CN103321420B CN103321420B CN201310258518.0A CN201310258518A CN103321420B CN 103321420 B CN103321420 B CN 103321420B CN 201310258518 A CN201310258518 A CN 201310258518A CN 103321420 B CN103321420 B CN 103321420B
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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 assists provisions for grouting, also relates to corresponding grouting method simultaneously, belongs to construction engineering technical field.
Background technology
Perfusion thixotroping slurry is needed in gamma steel beam tube road in EPR nuclear island of nuclear power station civil works inner containment 55C15 pre-stress system, it is large because its pipe trunk is long, transverse bending rises and falls, and steel stranded wire penetrating adapter quantity is wherein many, therefore to ensure that grouting is closely knit and there is suitable difficulty, be easy to occur bubble and space.In order to ensure the compactness of being in the milk, avoiding bubble and space, adopting the perfusion of back-grouting method for a long time always, namely carry out the perfusion of slow setting slurry first, carry out after completing blowing slurry, blow slurry at every turn and at least blow 2 to 3 times, within 4 to 7 days after being in the milk first, carry out secondary pouring, time-consuming.And back-grouting adopts the slurry that expands usually, and expansion slurry is highstrung slurry, to environment temperature and material temperature quite responsive, and cannot be used up in 30min and just need scrap, therefore have quite high requirement to the qualification of construction condition and constructor.
Summary of the invention
The object of the invention is to: for above-mentioned prior art Problems existing, proposing one can under guarantee grouting quality prerequisite, the disposable vacuum auxiliary grouting device completing the grouting of gamma shape prestress pipe, provide its grouting method simultaneously, thus significantly improve operating efficiency, reduce building operations cost.
In order to reach above object, gamma shape prestressing pipeline vacuum of the present invention assists provisions for grouting to comprise to be placed in gamma shape prestress pipe two ends to be communicated with the grout cap of grout pump and gamma shape prestress pipe, also comprise the vacuum line of being drawn by vertical section of gamma shape prestress pipe and segmental arc junction and the Valve controlling three-way interface that at least one is arranged at the segmental arc higher than described junction, described vacuum line connects vacuum pump through precipitate and separate device.
Gamma shape prestressing pipeline vacuum of the present invention assists the grouting basic step of provisions for grouting as follows:
The first step, allotment cement paste---add retarding agent in the cement be stirred adding water, the weight ratio of retarding agent and cement is 1.8%-2.2%, obtain slow setting starch;
Second step, start vertical section of lower end grout pump to vertical section of perfusion slow setting slurry, until the three-way interface place of opening has slurry to overflow, the grout pump of closedown gamma shape prestress pipe vertical section of lower end;
3rd step, leave standstill after 6-12 hour, gases at high pressure are accessed three-way interface, make three-way interface to described junction slow setting slurry blown out by vacuum line;
4th step, by the slow setting be stirred starch in add thixotropic agent, the weight ratio of thixotropic agent and cement is 0.5%-1.5%, obtain thixotroping starch;
5th step, close all valves of gamma shape prestress pipe of waiting to be in the milk, make it be in closed state, and open vacuum pump, pressure stability is at one atmospheric-80% to-95% (best-90%); The grout pump of the 6th step, startup gamma shape prestress pipe segmental arc termination is starched, until vacuum line has slurry to overflow segmental arc perfusion thixotroping.
It is that the outlet section of described grout cap sprue has the branch flow passage extended backwards that the present invention further improves, and the rear end of described branch flow passage and sprue also connects grout pump.So not only contribute to ensureing grouting flow, and can jet effect be formed, improve filling speed.
It is that described vacuum line has the sampling branch line of Valve controlling, and connects precipitate and separate device through transparent pipe that the present invention further improves.
The present invention is adopted to have following remarkable advantage:
1. ensure that high-quality grouting effect---the characteristic of thixotroping slurry makes the mobility of slurry highly stable, even if also can not slump in pipeline peak position, then coordinates vacuum grouting, effectively can prevent from wrapping up gas, ensure that the closely knit effect of grouting.
2. obvious reduction of erection time---compared with the technique needing secondary to fill with to expand and starch with tradition, vacuum-assisted thixotroping is starched to be in the milk not need to blow and is starched and back-grouting, can one-shot forming, therefore greatly reduces operation, shortens the duration.
3. save construction cost---owing to decreasing working procedure, without the need to the input of secondary agitation material and facility, improve operating efficiency, therefore optimize resource distribution, save cost.
4. easy and simple to handle---decreasing people is the probability of makeing mistakes, can be by force handling, is conducive to quality control.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is the structural representation of one embodiment of the invention.
Detailed description of the invention
Embodiment one
The gamma shape prestress pipe thixotroping slurry vacuum auxiliary grouting device of the present embodiment as shown in Figure 1, comprise grout cap A and B being placed in gamma shape prestress pipe 1 two ends and being 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 controlling three-way interface E3 arranged at the segmental arc higher than junction and the Valve controlling three-way interface E4 arranged at segmental arc peak.The distance of threeway E2 to three-way interface E3 is 8-10 rice.Vacuum line 2 has the sampling branch line 3 that valve V2 controls, and connects vacuum pump by the transparent pipe 4 after valve V1 through precipitate and separate device.The outlet section of the sprue of grout cap A, B has branch flow passage A2, B2 of extending respectively backwards, and branch flow passage also connects corresponding grout pump with rear end A1, B1 of respective sprue.A4, B4 are steam vent.
The vacuum auxiliary grouting process of the present embodiment gamma shape prestress pipe is as follows:
The first step, allotment cement paste---add Fu Si happy SP337 retarding agent (the happy RP264 of Fu Si or Grace ADVA 161C, 165C also can) in the PII42.5 cement be stirred adding water, the weight ratio of retarding agent and cement is about 2%, obtains slow setting slurry.
Second step, start vertical section of lower end grout pump by grout cap A to vertical section of perfusion slow setting slurry, until the three-way interface place E3 opened has slurry to overflow, the grout pump of closedown gamma shape prestress pipe vertical section of lower end.
After 3rd step, at least standing 6 hours (usually no more than 12 hours), gases at high pressure are accessed three-way interface E3, this three-way interface is blown out by vacuum line 2 to the slow setting slurry of junction E3.
4th step, by the slow setting be stirred starch in add polyamide thixotropes (or polyacrylamide thixotropic agent, res ipoly cemethix etc.), the weight ratio of thixotropic agent and cement is about 1%, obtain thixotroping starch.
5th step, close all valves of gamma shape prestress pipe of waiting to be in the milk, make it be in closed state, and open vacuum pump, pressure stability is at one atmospheric-90%.
The grout pump of the 6th step, startup gamma shape prestress pipe segmental arc termination, by grout cap B to segmental arc perfusion thixotroping slurry, until vacuum line 2 has slurry to overflow.
7th step, unlatching sampling branch line 2, to the slurry sampling of flowing out, measure slurry denseness, as reached 120cn.m (being no more than 350cn.m), then and the grout pump of closedown gamma shape prestress pipe vertical section of lower end; Otherwise continue grouting, till denseness is qualified.
Facts have proved, after adopting the present embodiment
1) high-quality grouting effect can be ensured.Because in paste after thixotroping slurry pulping, mobility and self repairing ability, when slurry is subject to shearing, denseness diminishes, and shearing force is larger, and denseness loss is larger.When stopping shearing, denseness increases again.This performance of thixotroping slurry, make the mobility of slurry highly stable, can not slump in pipeline peak position, then coordinate 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 flow forward, and the eddy flow that there will not be any generation bubble, can prevent from wrapping up gas in slurry, substantially reduce the number the quantity of bubble, the high-quality grouting effect of good slurry performance guarantee.
2) reduction of erection time is conducive to.Original dome pipeline, after the grouting of slow setting slurry, needs emptying for the slurry of top bleeding, then fills with to expand by secondary and has starched the grouting of whole pipeline.And the grouting of vacuum-assisted thixotroping slurry is due to slurry self and the characteristic of grouting process, do not need to blow slurry and back-grouting, one-shot forming, because this reducing operation, shortens the duration, improves operating efficiency, greatly optimizes resource distribution.
3) construction cost has been saved.Blow the minimizing of slurry and back-grouting operation, directly decrease corresponding man-hour, decrease the input of secondary agitation material and facility, saved cost.In addition, the shortening of duration contributes to saving construction cost.
5 operating procedures are simple.Due to slurry and technique itself, do not need to carry out slow setting slurry grouting exiting exhaust gas, entrance exhaust, blow the operational motions such as slurry, back-grouting, decreasing people is the probability of makeing mistakes, and is conducive to quality control.
The prestressing force thixotroping slurry vacuum grouting device of the present embodiment and grouting method are applied to the slurry perfusion of the gamma steel bundle dome section of nuclear power station EPR pre-stress system, this system has Gamma pipe 104, internal diameter of the pipeline is 160mm, average every long 109.3m of root pipeline, amount to length 11366.899m, grouting amount is 142m
3.Every root pipeline lashing steel strand 54, in pipeline, steel strand distribution is closeer, and add that pipeline fluctuation is large, Gamma pipe dome section 17.245m, span reaches 46.254m, brings acid test therefore to the closely knit effect of grouting.Adopted traditional slow setting slurry grouting process not only to construct trouble in the past, and be difficult to the requirement meeting slurry compactness, the thixotroping after this enforcement is adopted to starch the grouting technique adding vacuum-assisted, dome pipe is then made to have extraordinary grouting effect, under the prerequisite guaranteeing grouting quality, work efficiency can be significantly improved.The invention is not restricted to 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 assists provisions for grouting, it is characterized in that: comprise the grout cap being placed in gamma shape prestress pipe two ends and being communicated with grout pump and gamma shape prestress pipe, also comprise the vacuum line of being drawn by vertical section of gamma shape prestress pipe and segmental arc junction and the Valve controlling three-way interface that at least one is arranged at the segmental arc higher than described junction, described vacuum line connects vacuum pump through precipitate and separate device.
2. prestressing force vacuum auxiliary grouting device according to claim 1, is characterized in that: the outlet section of described grout cap sprue has the branch flow passage extended backwards, and the rear end of described branch flow passage and sprue also connects grout pump.
3. prestressing force vacuum auxiliary grouting device according to claim 2, is characterized in that: described vacuum line has the sampling branch line of Valve controlling, and connects precipitate and separate device through transparent pipe.
4. prestressing force vacuum auxiliary grouting device according to claim 3, is characterized in that: vacuum line is drawn by threeway in described junction, and described three distances passing to three-way interface are 8-10 rice.
5. adopt the grouting method of prestressing force vacuum auxiliary grouting device described in claim 1, it is characterized in that comprising the steps:
The first step, allotment cement paste---add retarding agent in the cement be stirred adding water, the weight ratio of retarding agent and cement is 1.8%-2.2%, obtain slow setting starch;
Second step, start vertical section of lower end grout pump to vertical section of perfusion slow setting slurry, until the three-way interface place of opening has slurry to overflow, the grout pump of closedown gamma shape prestress pipe vertical section of lower end;
3rd step, leave standstill after 6-12 hour, gases at high pressure are accessed three-way interface, make three-way interface to described junction slow setting slurry blown out by vacuum line;
4th step, by the slow setting be stirred starch in add thixotropic agent, the weight ratio of thixotropic agent and cement is 0.5%-1.5%, obtain thixotroping starch;
5th step, close all valves of gamma shape prestress pipe of waiting to be in the milk, make it be in closed state, and open vacuum pump, 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 starched, until vacuum line has slurry to overflow segmental arc perfusion thixotroping.
6. the grouting method of prestressing force vacuum auxiliary grouting device according to claim 5, characterized by further comprising:
7th step, unlatching sampling branch line, to the slurry sampling of flowing out, measure slurry denseness, as reached 120cn.m, then and the grout pump of closedown gamma shape prestress pipe vertical section of lower end; Otherwise continue grouting, till denseness is qualified.
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| CN201310258518.0A CN103321420B (en) | 2013-06-26 | 2013-06-26 | Vacuum-assisted grouting device and method for gamma-type prestressed pipes |
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| CN201310258518.0A CN103321420B (en) | 2013-06-26 | 2013-06-26 | Vacuum-assisted grouting device and method for gamma-type prestressed pipes |
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| CN103321420B true CN103321420B (en) | 2015-05-13 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN106286240B (en) * | 2016-10-15 | 2018-07-03 | 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 its technique |
| 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 |
| CN114150873B (en) * | 2021-11-18 | 2023-03-17 | 东南大学 | Grouting method for sleeve grouting |
| CN114645619B (en) * | 2022-03-31 | 2023-08-11 | 中国核工业华兴建设有限公司 | Construction method for integrally pulling Gamma steel strand 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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