CN105064398A - One-time overall pouring construction method for nuclear powder single-hole GD gallery - Google Patents
One-time overall pouring construction method for nuclear powder single-hole GD gallery Download PDFInfo
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- CN105064398A CN105064398A CN201510514905.5A CN201510514905A CN105064398A CN 105064398 A CN105064398 A CN 105064398A CN 201510514905 A CN201510514905 A CN 201510514905A CN 105064398 A CN105064398 A CN 105064398A
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Abstract
The invention relates to a one-time overall pouring construction method for a nuclear powder single-hole GD gallery. The construction method includes the following procedures of foundation trench cleaning, cushion layer construction, positioning paying-off, PE thin film laying, bottom plate rebar binding, wall outer wall rebar binding, rubber waterstop installing, embedded part installing, inner formwork overall prefabricating, inner formwork installing and correcting, upper segment rebar binding, outer formwork installing, anti-floating measure taking, concrete one-time pouring construction, maintaining and die stripping. According to the construction method, an inner formwork is overall prefabricated, so that installation and detachment are convenient, and a curve of the section of an inner hole of the gallery is effectively guaranteed; by means of concrete one-time overall pouring, a horizontal construction joint is omitted, and integrality is good, so that water leakage caused by improper treatment on the horizontal construction joint is avoided; the structure water tightness is guaranteed, and potential hazards are completely eradicated; by means of the method, the construction difficulty is lowered, the working efficiency is improved, the construction period is shortened, and cost is reduced.
Description
Technical field
The present invention relates to nuclear power single hole GD gallery construction method technical field, particularly a kind of nuclear power single hole GD gallery disposable integral pouring construction method.
Background technology
Current domestic nuclear power technology is ripe and in the type design of the CPR1000 heap-type widelyd popularize, recirculated water inlet passage GD is the important underground structure connecting PX associating pump house and MX factory building, for the watertightness structure of Large-diameter Steel reinforced concrete inner circle foreign side, it is impervious and surface smoothness requirements is all very high, vertical, the horizontal relative position allowable variation value of structure requires to be less than ± 5mm, therefore the structure construction of recirculated water inlet passage, construction sequence is changeable, thus increases difficulty of construction.
Traditional design single tube inlet segment generally adopts two-step pouring, and establish horizontal construction joint at 1.3m place at the bottom of plate, it is the steel plate water stopper of 500mm that horizontal construction joint medium design installs width, and the thick 3mm of steel plate, 250mm is stretched on every limit.After first floor concreting, dabbing need be carried out in constuction joint surface, rinse well with water, suppress after two-step pouring, often there is constuction joint position new-old concrete and objectively combine tight, the mass defect that cause existence to be seeped water, leak etc. cannot eliminate, simultaneously, contaminated reinforcing bar needs to clean out, and both adds human and material resources like this, turn increases the construction period.
Summary of the invention
The object of the invention is to, provide a kind of and simplify difficulty of construction, ensure the quality of products, improve work efficiency, the reduction of erection time, provide against hidden trouble, cost-saving nuclear power single hole GD gallery disposable integral pouring construction method.
To achieve these goals, the technical solution adopted in the present invention is as follows: a kind of nuclear power single hole GD gallery disposable integral pouring construction method, comprises following operation: foundation trench is cleared up, cushion construction, line setting, lays PE film, base plate steel bar binding, wall outer wall reinforcing bar binding, rubber fastening band is installed, embedded part is installed, inner formword is integral prefabricated, and inner formword is installed and corrected, epimere reinforcing bar binding, exterior sheathing is installed, anti-floating measure, concrete one-time-concreting is constructed, maintenance, form removal.
The integral prefabricated annular drum circle comprising the steps: to be customized to annular I10# i iron of described internal mold, spacing 350mm arranges, longitudinal reinforcement Two bors d's oeuveres I10 i iron and drum circle bolt are assembled into skeleton, make groove and tognue type with long 50 × 100mm flitch between annular drum circle and insert drum circle i iron frange plate, again by the embedding of short 50 × 100mm flitch, stickfast, form overall skeleton; With scaffold tubes, fastener and shore formed internal mold support; Arcuately skeleton surface completely spreads the wood lath of 20 × 50mm, and the wood lath of 20 × 50mm and 50 × 100mm flitch is nailed together, by three ply board paving nail on the surface of wood lath.
Described anti-floating measure comprises the steps: to strain with Two bors d's oeuveres No. 18 channel-section steel shoulder pole girders and pre-buried earth anchor pull bar, and shoulder pole girder and interior circle template is held out against as compression bar with shoring with scaffold tubes; Depression bar summit must directly over the ring-like skeleton of inner formword, the thick bulkhead of compression bar end spot welding 3mm, prevents the scaffold tubes tube wall as compression bar from cutting damage template surface, offsets pressure on top surface.Circle pull bar angle at 45 °, mould both sides and pre-buried earth anchor are strained, and one draws a top to combine prevents inner formword in concreting process from floating.
Described concrete one-time-concreting construction comprises the steps: to adopt the disposable concreting of homogeneous tube, controls the speed of concreting, avoids building too fast internal mold and floats; Reserved hole of vibrating, internal mold bottom surface, enters into during bottom slab concreting in round mould and vibrates; When the assembling reinforcement of gallery base plate, reserved hole of vibrating, by reinforcing bar recovers after vibrating bottom gallery; Treat that concreting is complete, mould top compression bar will be justified before concrete initial set and remove, surperficial press polish.
Beneficial effect of the present invention is, this nuclear power single hole GD gallery disposable integral pouring construction method adopts integral prefabricated by inner formword, and installation, convenient disassembly, effectively ensure that the curve of gallery inner hole section; Concrete disposable integral is built, and eliminates horizontal construction joint, good integrity, avoids to cause because horizontal construction joint deals with improperly to leak, and ensure that structure watertightness, has stopped hidden danger; This way simplifies difficulty of construction, improves work efficiency, shortens the duration, has saved cost.
Accompanying drawing explanation
Fig. 1 be the internal mold of nuclear power single hole GD gallery disposable integral pouring construction method integral prefabricated and reinforce schematic diagram.
Fig. 2 is the partial enlarged drawing of part A in Fig. 1.
Above-mentioned number in the figure is described as follows:
1---Two bors d's oeuveres I10# i iron; 2---50 × 100mm flitch; 3---annular I10# i iron; 4---three ply board; 5---the wood lath of 20 × 50mm; 6---Two bors d's oeuveres No. 18 channel-section steels; 7---shore; 8---scaffold tubes; 9---pull bar; 10---earth anchor.
Detailed description of the invention
Technical scheme of the present invention is described further by specific embodiment below in conjunction with accompanying drawing.
Embodiment:
A kind of nuclear power single hole GD gallery disposable integral pouring construction method, comprises following operation: foundation trench is cleared up, cushion construction, line setting, lays PE film, base plate steel bar binding, wall outer wall reinforcing bar binding, rubber fastening band is installed, embedded part is installed, and inner formword is integral prefabricated, inner formword is installed and is corrected, epimere reinforcing bar binding, exterior sheathing is installed, anti-floating measure, concrete one-time-concreting is constructed, maintenance, form removal.
Foundation trench cleanup step:
The first step, the things such as the loose stone of surface of bedrock, stone flour, surface dust, rock ballast, clean with broom cleaning, and transport outside hole;
Second step, to the residue of rock crevice, local dip's recess, removed with scuppit, the foreign material such as the aggregate chips still remained on surface, surface dust, with high pressure water washing, clean out sewage after rinsing well; With water pump, flushing water is discharged outside foundation ditch; Draw sand grains, rock ballast with dust catcher if desired, then rinse with water, blot flushing water with continuous yarn or sponge.
Cushion construction step:
Absolute altitude control point is carried out according to bedding design top mark is high before concrete construction, to foundation trench backbreak position carry out concrete construction time, substitute concrete and blinding concrete C25 concrete one-time-concreting, nothing is backbreak position bed course, use C15 concrete directly to build, concrete completely spreads foundation trench bottom surface.
Line setting step:
At bed course side distance structure sideline 30cm during blinding concrete pouring construction, equidistantly bury underground along the longitudinal 750mm of structure
earth anchor.
Lay PE film:
When after the good structure centre line of mat surface bullet, structure sideline and the structure expansion joint position line, before carrying out structure reinforcing bars colligation, at its surface paving one PE transparent membrane, film overlap joint wants tight.
Base plate steel bar binding:
Base plate steel bar binding order is: bottom layer of the reinforcing steel colligation, cushion block, lay steel bar horse-shaped bench (or support), the colligation of surfacing steel bar mesh sheet, the colligation of body of wall joint bar.
Wall outer wall reinforcing bar binding:
Body of wall vertical reinforcement spreading, tying wall horizontal bar, ties up skin horizontal bar at the bottom of top board, ties up skin longitudinal rib at the bottom of top board, installs split heads, ties up plate epithelium longitudinal rib, bind skin horizontal bar, inserts and ties up wall, plate corner muscle, tie up shrinkage joint place reinforcing bar.
Rubber fastening band, embedded part are installed:
Rubber fastening band installs interspersed carrying out with construction joint formwork after being arranged on reinforcing bar binding.Adopt
the location stirrup spacing 300mm that reinforcing bar bends fixes.At recirculated water intake-discharge pipe ditch constuction joint, place is provided with stainless steel embedded part.
Internal mold is integral prefabricated to be comprised the steps:
The first step, first carry out design merogenesis to length according to the lifting capacity of crane before joining mould, internal mold presses sectional;
Second step, the annular drum circle be customized to annular I10# i iron 3, spacing 350mm arranges, be close to by design pitch boring on the frange plate of back cord side, inner side, longitudinal reinforcement bolt and Two bors d's oeuveres I10# i iron 1 are assembled into skeleton for stupefied; Make groove and tognue type with long 50 × 100mm flitch 2 between annular drum circle and insert drum circle i iron frange plate, then by between short 50 × 100mm flitch 2 spacing 350mm embedding drum circle, stickfast, form overall skeleton.With scaffold tubes 8, fastener and shore 7 formation internal mold rice words support,
reinforcing bar and i iron be welded into cross shear and support, ensure that the rigidity of internal mold.Arcuately skeleton surface completely spreads the wood lath 5 of 20 × 50mm, and wood lath 5 and short flitch 2 is nailed together, and 3mm three ply board 4 is spread nail on the surface of wood lath;
3rd step, at surface brush twice varnish after three ply board 4 has pasted, had both ensured the smooth of plate face, again can be effectively moistureproof, reduced distortion;
4th step, reserved local, inner circle mould top backform does not seal, on-the-spot envelope nail after in place;
5th step, bottom internal mold, spacing 1m opens the square hole of vibrating of 200mm*200mm in the axial direction, and carries out cornerite with galvanized sheet iron, can to vibrate hole according to actual conditions increase in shrinkage joint place;
6th step, after inner formword sectional is good, goes out central point to correct when lifting in every segment mark.
Inner formword is integral prefabricated synchronously to carry out with installing, and corrects afterwards.
Epimere reinforcing bar binding:
Stirrup as inner membrance location, braced structures, first three row's Φ 25 column reinforcing bars in the middle of welding, then weld Φ 18 horizontal full-length reinforcing bar and be connected and fixed often arranging column.
Exterior sheathing is installed:
External mold adopts the thick wooden form of 15mm, 50 × 100mm flitch does rib, stand up, spacing 200mm, template stall bars side horizontal arrangement during straight section construction, channel-section steel is outer back cord, vertical layout, spacing 600mm, during turnaround section construction, template stall bars side vertically arranges, adopt do interior back cord according to the channel-section steel of turning radius pre-bending, horizontal arrangement, spacing 1000mm, Φ 16 split bolt reinforce.
Anti-floating measure comprises the steps:
In concreting process, rising phenomenon is there is for preventing inner formword, inner formword lifting, correct complete, exterior sheathing in place after, before single tube concreting, structurally side is according to spacing 1m across Two bors d's oeuveres No. 18 channel-section steel 6 shoulder pole girders, and lower end and pre-buried earth anchor 10 are used
pull bar 9 is strained, and with scaffold tubes 8 with shore 7 as compression bar, shoulder pole girder and interior circle template hold out against by spacing 1m; Circle mould both sides are used
pull bar 9 angle at 45 ° and pre-buried earth anchor 10 are strained; One draws a top to prevent inner formword in concreting process from floating, and requires that depression bar summit must directly over the ring-like skeleton of inner formword.
The construction of concrete one-time-concreting comprises the steps:
When underplate concrete is built, build from the side blanking of circular internal mold, avoid both sides to build on the downside of internal mold simultaneously and produce the mass defect such as hole, bubble; Bottom slab concreting is complete, and sidewall concreting is alternately symmetrical blanking from the both sides of circular internal mold, avoids side blanking to make internal mold produce lateral displacement.Control the speed of building in concreting process, notice that concrete pause is waited for, concreting in lifts, avoid building too fast internal mold and float.
In circle mould, carry out base plate by reserved hole of vibrating when building to vibrate, vibrated successively according to cloth order in circle mould both sides by roof steel bar mesh sheet, guarantee that leakage can not occur shakes; Vibrate behind bottom and reinforcing bar has been recovered, treated that concreting is complete, will justify the compression bar dismounting of mould top before concrete initial set, surperficial press polish, covered with plastic film and piece of sack maintenance.
Claims (4)
1. a nuclear power single hole GD gallery disposable integral pouring construction method, is characterized in that, comprise following operation: foundation trench is cleared up, cushion construction, line setting, lays PE film, base plate steel bar binding, wall outer wall reinforcing bar binding, rubber fastening band is installed, embedded part is installed, inner formword is integral prefabricated, and inner formword is installed and corrected, epimere reinforcing bar binding, exterior sheathing is installed, anti-floating measure, concrete one-time-concreting is constructed, maintenance, form removal.
2. nuclear power single hole GD gallery disposable integral pouring construction method according to claim 1, it is characterized in that, the integral prefabricated annular drum circle comprising the steps: to be customized to annular I10# i iron (3) of described internal mold, spacing 350mm arranges, longitudinal reinforcement Two bors d's oeuveres I10# i iron (1) and drum circle bolt are assembled into skeleton, make groove and tognue type with long 50 × 100mm flitch (2) between annular drum circle and insert drum circle i iron frange plate, again by the embedding of short 50 × 100mm flitch (2), stickfast, form overall skeleton; With scaffold tubes (8), fastener and shore (7) formed internal mold support; Arcuately skeleton surface completely spreads the wood lath (5) of 20 × 50mm, and the wood lath (5) of 20 × 50mm and 50 × 100mm flitch (2) is nailed together, by three ply board (4) paving nail on the surface of wood lath.
3. nuclear power single hole GD gallery disposable integral pouring construction method according to claim 1, it is characterized in that, described anti-floating measure comprises the steps: to strain with Two bors d's oeuveres No. 18 channel-section steel (6) shoulder pole girders and pre-buried earth anchor (10) use pull bar (9), and with scaffold tubes (8) with shore (7) and as compression bar, shoulder pole girder and interior circle template are held out against; Depression bar summit must directly over the ring-like skeleton of inner formword, the thick bulkhead of compression bar end spot welding 3mm, prevents scaffold tubes (8) tube wall as compression bar from cutting damage template surface, offsets pressure on top surface; Circle pull bar (9) angle at 45 °, mould both sides and pre-buried earth anchor (10) are strained, and one draws a top to combine prevents inner formword in concreting process from floating.
4. nuclear power single hole GD gallery disposable integral pouring construction method according to claim 1, it is characterized in that, described concrete one-time-concreting construction comprises the steps: to adopt the disposable concreting of homogeneous tube, controls the speed of concreting, avoids building too fast internal mold and floats; Reserved hole of vibrating, internal mold bottom surface, enters into during bottom slab concreting in round mould and vibrates; When the assembling reinforcement of gallery top board, reserved hole of vibrating, by vibrating bottom gallery, recovers reinforcing bar behind bottom of having vibrated; Treat that concreting is complete, mould top compression bar will be justified before concrete initial set and remove, surperficial press polish.
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| CN105971016A (en) * | 2016-07-12 | 2016-09-28 | 中国电建集团昆明勘测设计研究院有限公司 | Utility tunnel internode connection structure |
| CN107030877A (en) * | 2017-05-20 | 2017-08-11 | 西咸新区矩阵实业有限公司 | It is a kind of for steel performance steel loose tool of prefabricated component and preparation method thereof |
| CN110820752A (en) * | 2019-11-05 | 2020-02-21 | 中铁二十二局集团轨道工程有限公司 | Bottom plate steel bar system and shield well foundation pit main structure construction method comprising same |
| CN112627854A (en) * | 2020-12-01 | 2021-04-09 | 中国电建集团华东勘测设计研究院有限公司 | Clay tunnel steel lining concrete pouring anti-floating structure and construction method |
| CN113006133A (en) * | 2021-01-29 | 2021-06-22 | 广州地铁设计研究院股份有限公司 | Construction method of middle plate hole suitable for assembly type station |
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| CN113512958A (en) * | 2021-05-10 | 2021-10-19 | 山西四建集团有限公司 | Cast-in-place concrete small-section box culvert one-step forming method |
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Application publication date: 20151118 |