CN105839850B - Precompressed construction method is poured into a mould after basement top-down method shaft - Google Patents
Precompressed construction method is poured into a mould after basement top-down method shaft Download PDFInfo
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- CN105839850B CN105839850B CN201610175190.XA CN201610175190A CN105839850B CN 105839850 B CN105839850 B CN 105839850B CN 201610175190 A CN201610175190 A CN 201610175190A CN 105839850 B CN105839850 B CN 105839850B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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- 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
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/02—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor
-
- 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
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/02—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor
- E04G13/028—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor for columns' capital
-
- 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
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
- E04G21/08—Internal vibrators, e.g. needle vibrators
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
Precompressed construction method is poured into a mould after basement top-down method shaft, belongs to construction engineering technical field.It first completes one layer of Beam-Slab Construction, then basement negative one layer beam slab of constructing, finally the negative one layer shaft of construction connection negative one layer beam slab and one layer of beam slab, and its construction technology is as follows：Pouring hole indwelling, stigma and shaft treatment of construction joints, shaft formwork erection, Screw arbor with nut at both-ends are tightened precompressed, shaft concreting, form removal and maintenance and reject stigma horn mouth.The construction method of the present invention is greatly facilitated pours the constructing operation smash, enable concrete that basement negative one layer post is directly transported to from one layer of top board, while transport directly start to pour to smash operation, it is time saving and energy saving, avoid concrete first to be hung on negative one layer beam slab with tower crane, substantially increase shaft and pour the speed of application smash, saved the construction period, with very strong popularizing action, it is adaptable to using the secondary engineering for pouring pound column body of basement top-down method.
Description
Technical field
The invention belongs to construction engineering technical field, and in particular to a kind of both to have facilitated site operation, and new and old concrete can be improved
Precompressed construction method is poured into a mould after the basement top-down method shaft of seam degree of compaction.
Background technology
After solving basement top-down method shaft at present, the conventional construction method of pouring concrete has four kinds, respectively bell mouth pressure
Note method, method of repeatedly vibrating, sleeve pipe casting method, filling method, wherein bell mouth drape process are most popular methods, but the method
Most significant three have the disadvantage：
1）In traditional bell mouth drape process, funnel hang plate inclination angle is that, between 20 ° to 30 °, inclination angle arranges too small, can go out
Existing following two problems：One is to cause bell mouth oral area excessive, and at later stage funnel to be rejected, concrete volume is more；Two when being to pour concrete
Effect of closely knit played of the structure counter-force that hang plate is provided to new and old concrete contact surface be not scientific and reasonable；
2）Have the disadvantage that during traditional bell mouth drape process formwork：One is the precompressed measure for not having hang plate to concrete；
Two is that the setting of bell mouth size does not have theoretical foundation to there is larger subjective arbitrariness；
3）The concrete of traditional bell mouth drape process pours the method for smashing and there is certain defect, because of the presence of post core position lattice column
And the setting of column tie-bar, pour concrete when smashing to newly pouring be difficult to vibrate it is fully closely knit.
The content of the invention
For the above-mentioned problems in the prior art, it is an object of the invention to using pouring after basement top-down method shaft
Note precompressed construction had both facilitated site operation, and poured into a mould precompressed after improving the basement top-down method shaft of new and old concrete seam degree of compaction
Construction method.
Precompressed construction method is poured into a mould after described basement top-down method shaft, it is characterised in that first complete one layer of beam slab and apply
Work, then basement negative one layer beam slab of constructing, finally construction connect the negative one layer shaft of negative one layer beam slab and one layer of beam slab, its construction
Technique is as follows：Pouring hole indwelling, stigma and shaft treatment of construction joints, shaft formwork erection, Screw arbor with nut at both-ends are tightened precompressed, shaft and are mixed
Solidifying soil is poured, form removal and maintenance and reject stigma horn mouth.
Precompressed construction method is poured into a mould after described basement top-down method shaft, it is characterised in that Specific construction technique is as follows：
1）Pouring hole indwelling：Beam slab and stigma are poured by design requirement, for later stage shaft concreting, stigma and beam
When board concrete is poured, on the Square consisting of two isosceles right-angled triangles of frame column position, pre-buried PVC sleeve pipes are used as reserved pouring hole；
2）Stigma and shaft treatment of construction joints：Capital face dabbing, post bottom surface concrete pick the pan bottom shape hole of concave up of chisel,
Before casting and compacting of concrete, 30min pours a small amount of clear water into template simultaneously, and template, lattice column and reinforcing bar abundant moistening is poured mixed
Before solidifying soil, one layer of stone mortar is first laid at post bottom surface；
3）Shaft formwork erection：In step 1）Funnel pressure injection entrance is installed in the stigma bottom poured, funnel pressure injection entrance by
Two funnel hang plates are separately fixed at and pour the template top of shaft concrete and obtain, and it is past that funnel pressure injection entry bottom is located at stigma bottom surface
At lower 300mm, funnel pressure injection access opening top is located at stigma bottom surface up 200mm；
4）Screw arbor with nut at both-ends tightens precompressed：In step 3）Screw arbor with nut at both-ends is set on the funnel hang plate of installation, is tightened to drawing spiral shell
Bar, using Screw arbor with nut at both-ends precompressed before concrete initial set, makes concrete push up power upwards, makes after-pouring concrete effective with top stigma seam crossing
It is closely knit；
5）Shaft casting and compacting of concrete：, in 170-200mm, concrete segmentation is poured, is mixed to pour concrete slump control when smashing
The primary height that pours of solidifying soil is less than 600mm, and under being carried out after each concrete vibrating poured in height is closely knit again
One-time-concreting, concreting to from stigma lower surface 280-320mm when stop pouring, 1 h of interval, so that concrete itself is heavy
Drop, is further continued for pouring remaining position concrete before concrete initial set；As bell mouth top is higher by 200mm than stigma bottom surface, profit
With concrete gravity and the principle of internal and external pressure balance, by new-old concrete junction vibration compacting, the generation of handing-over seam is reduced；
6）Form removal and maintenance：After concreting is finished, mould is removed again when concrete strength reaches every square millimeter of 1N
Plate, and ensure that form removal process center pillar corner angle are injury-free, using plastic sheeting parcel maintenance after form removable, seam crossing adopts glue
Band sealing；
7）Reject stigma horn mouth：After concrete strength reaches 75%, artificial rejecting stigma bell mouth any excess concrete, and
It is tentatively smooth with post surface, then concrete surface fine chipping is carried out by artificial stone with textures cut with an axe technique with axe, finally by four, pillar
External corner angle grinder wears into the external corner of Founder, and construction is completed.
Precompressed construction method is poured into a mould after described basement top-down method shaft, it is characterised in that step 1）Middle PVC sleeve pipes are straight
Footpath size is 140-160mm, preferably 150mm.
Precompressed construction method is poured into a mould after described basement top-down method shaft, it is characterised in that step 2）Middle stone mortar paving
If thickness is 50-100mm.
Precompressed construction method is poured into a mould after described basement top-down method shaft, it is characterised in that step 3）Described in funnel pressure
Inlet is inclined to be fixed on by funnel hang plate in 45 ° and pours the template top of shaft concrete and obtain, and funnel pressure injection entrance pours height
For 500mm, width is 500mm, and length is the post length of side in bell mouth place face.
Precompressed construction method is poured into a mould after described basement top-down method shaft, it is characterised in that step 4）Described in draw spiral shell
Bar two ends are set with funnel hang plate junction and use cleat, are padded by cleat.
Precompressed construction method is poured into a mould after described basement top-down method shaft, it is characterised in that step 5）Middle puddling method
For：Inserted soon using immersion vibrator and pulled out slowly, insert that point is evenly distributed, pointwise movement is carried out in order, movement is asked away from for 300-
400mm；Vibrate last layer when should insert lower-layer concrete face 50mm, to eliminate the seam of two interlayers.
Precompressed construction method is poured into a mould after described basement top-down method shaft, it is characterised in that every vibrating time of concrete
For 30-45s, shaken after per interval 10-20min again.
Precompressed construction method is poured into a mould after described basement top-down method shaft, it is characterised in that step 5）In pour coagulation when smashing
The native slump is 180mm.
By using above-mentioned technology, compared with prior art, beneficial effects of the present invention are as follows：
1）Job site concrete is marched into the arena slump control between 170mm to 200mm by the present invention, and preferably 180mm is prevented
Concrete slump is excessive, segregation phenomenon occurs and affects concrete strength, while it also avoid that concrete slump is too small is difficult to vibration compacting,
Honeycomb or hole phenomenon are easily caused, the present invention also extends every vibrating time of concrete, and both collective effects improve which and mix
Solidifying soil vibration compacting；
2）Casting concrete front pillar formwork erection of the present invention is simultaneously reinforced, and detailed inspection is done in the setting to tie, Screw arbor with nut at both-ends,
And in Screw arbor with nut at both-ends and hang plate junction, cleat is set, it is limited prevent casting process in spillage, swollen mould, quick-fried mould etc. occur existing
As improving construction quality；
3）The present invention is the secondary form erection plan for pouring the design of pound column body of basement top-down method, has very strong reality concurrently operable
Property and scientific basis, in combination with the scheme of smashing of pouring for summarizing out from practical construction experience, both complementary result energy
After Reliable guarantee form removal, shaft hands over seam crossing to pour dense and avoid the occurrence of shaft casting pounding quality common fault with stigma, with very strong
Popularizing action, it is adaptable to using the secondary engineering for pouring pound column body of basement top-down method；
2）As basement top-down method is first to complete one layer of beam slab, basement negative one layer beam slab of constructing afterwards, negative one layer shaft
Finally construct, thus pour concrete when smashing negative one layer shaft how to transport from one layer of beam slab negative one layer close pour pound column body
Construction Difficulties, the present invention pour the way for smashing hole to be provided by arranging one layer of beam slab upper prop corner, greatly facilitate and pour applying of smashing
Work is operated so that concrete directly can be transported to basement negative one layer post from one layer of top board, directly start while transport
Pour and smash operation, it is time saving and energy saving, it is to avoid concrete is first hung on negative one layer beam slab with tower crane, then by hand haulage to post side, most
The awkward situation smash is poured by adjustable shelf relay afterwards, shaft is substantially increased and is poured the speed of application smash, saved the construction period.
Description of the drawings
Fig. 1 is the constructing structure schematic diagram of the present invention；
Fig. 2 is the construction flow chart of the present invention.
In figure：1- funnel hang plates, 2- cleats, 3- Screw arbor with nut at both-ends, 4- templates, pouring concrete after 5-, 6- stigmas bottom surface,
7- funnel pressure injection entrances, 8- stigmas, 9- pouring out concrete buckets.
Specific embodiment
The description entered is made to the present invention below in conjunction with Figure of description, but protection scope of the present invention is not limited in
This：
Fig. 1 is the constructing structure schematic diagram of the present invention, as shown in figure 1, the bottom surface of stigma 8 referred to as stigma bottom surface 6, and newly
Old concrete seam crossing, funnel pressure injection entrance 7 are arranged on shaft, and funnel pressure injection entrance 7 is inclined and mounted on post by funnel hang plate 1
4 top of template of body, angle of inclination are that 45 °, i.e. funnel pressure injection entrance 7 are equilateral triangle structure, and 7 bottom of funnel pressure injection entrance
At stigma bottom surface 6 down 300mm, at the top of funnel pressure injection entrance 7 at stigma bottom surface 6 up 200mm, the funnel pressure injection
Entrance 7 pours height for 500mm, and width is 500mm, and length is the post length of side in bell mouth place face；Funnel hang plate 1 includes two
It is individual, it is symmetricly set at the top of two side templates 4, and two funnel hang plates 1 is connected by Screw arbor with nut at both-ends 3, in order that after-pouring coagulation
Soil 5 is effectively closely knit with 6 seam crossing of stigma bottom surface of top stigma 8, and the present invention is in Screw arbor with nut at both-ends 3 and 1 junction of funnel hang plate
Cleat 2 is set, is padded by cleat 2, then when tightening Screw arbor with nut at both-ends 3, using Screw arbor with nut at both-ends precompressed before concrete initial set, make concrete
Power is pushed up upwards, and the purpose closely knit so as to reach seam, the concrete of funnel pressure injection entrance 7 are fed by pouring out concrete bucket 9.
As shown in Fig. 2 precompressed construction method is poured into a mould after the basement top-down method shaft of the present invention, it is first to complete one layer of beam
Plate, basement negative one layer beam slab of constructing afterwards, negative one layer shaft finally construct, and shaft construction is using pouring after basement top-down method shaft
Note preloading method, its concrete construction method are as follows：
1）Pouring hole indwelling
Stigma 8 and beam slab are poured into a mould by design requirement, the rear pouring concrete 5 for ease of later stage shaft is poured, stigma 8 and beam
When board concrete is poured, on the Square consisting of two isosceles right-angled triangles of frame column position, pre-buried PVC sleeve pipes are used as reserved pouring hole, the diameter chi of PVC sleeve pipes
It is very little for 140-160mm, preferably 150mm；
2）Stigma 8 and shaft treatment of construction joints
The top surface for first pouring the stigma 8 being poured in carries out dabbing according to a conventional method, and post bottom surface concrete picks the pot of concave up of chisel
Laitance is driven out of when pouring so as to the rear pouring concrete 5 of shaft by bottom shape hole；Lattice column, reinforcing bar and template 4 are built, while mixed
Solidifying soil is poured to be smash front 30min and pours a small amount of clear water into template 4, by template 4, lattice column and the abundant moistening of reinforcing bar, in stigma bottom surface 6
（That is post bottom New-old concrete joint surface）One layer of stone mortar is laid first, laying depth is controlled in 50mm -100mm, to eliminate
" rotten " phenomenon；
3）Shaft formwork erection
Column template is installed should be installed and be reinforced by arrangement and method for construction requirement, and the setting to tie, Screw arbor with nut at both-ends is done in detail
Check, the phenomenons such as spillage, swollen mould, quick-fried mould in preventing casting process, occur, 8 bottom of the stigma installation funnel pressure injection for formerly pouring concrete enters
Mouth 7, funnel pressure injection entrance 7 are that 45 ° of funnel hang plates 1 are constituted installed in the top of template 4 by inclination angle, 7 bottom of funnel pressure injection entrance
Portion is higher by stigma bottom surface 6 at the top of funnel pressure injection entrance 7 at stigma bottom surface 6 down 300mm, and the height being higher by is 200mm, therefore
Bell mouth pours height for 500mm, and width is 500mm, and length is the post length of side in bell mouth place face；
The present invention is conducive to pouring the carrying out for smashing operation by arranging the post length of side of the bell mouth length for bell mouth place face,
Way is to take the bell mouth length in post opposite sides indwelling isometric with the cylinder length of side which is located, and is set up in another both sides
Auxiliary funnel mouth, its length are 500mm, pour when smashing big bell mouth mainly to pour and smash position, and little bell mouth is vibrated position for auxiliary.
4）Screw arbor with nut at both-ends tightens precompressed
Screw arbor with nut at both-ends 3 is set on funnel hang plate 1, and in Screw arbor with nut at both-ends 3 and 1 junction cleat of funnel hang plate
2 pad, and tighten Screw arbor with nut at both-ends 3, using the precompressed before concrete initial set of Screw arbor with nut at both-ends 3, make concrete push up power upwards, make rear pouring concrete 5 and
Top stigma bottom surface 6 is effectively closely knit；
5）Shaft casting and compacting of concrete
Due to concrete slump it is excessive, it may appear that segregation phenomenon, concrete strength can be affected, and concrete slump is too small, then be difficult to shake
Puddling reality, easily causes honeycomb or hole phenomenon, the present invention at the construction field (site) will control concrete march into the arena the slump in 170mm extremely
200mm, pours the preferred 180mm of concrete slump when smashing, and the primary height that pours of concrete is less than 600mm, and at each
Pour the concrete vibrating in height it is closely knit after can be poured next time, concreting to from stigma lower surface about
Stop pouring during 300mm, 1 h of interval, so that concrete settlement, is further continued for pouring remaining position coagulation before concrete initial set
Soil, as 7 top of funnel pressure injection entrance is higher by 200mm than stigma 8, using concrete gravity and the principle of internal and external pressure balance,
By new-old concrete junction vibration compacting, the generation of handing-over seam, volume of concrete summation on two funnel pressure injection entrances 7 are reduced
More than the shaft volume of concrete between 7 bottom surface of stigma bottom surface 6 and funnel pressure injection entrance；
The present invention is smash when shaking, and smashes and shake between two lattice columns, while on the outside of template 4 aiding in smashing shaking, concrete is per point
Vibrating time control is shaken after 30 to 45s, 10 to 20min again；Final step concreting, concrete is from bell mouth
Adjacent both sides blanking, and vibrate in the same side, when vibrating, vibrating spear need to insert 50mm in casting concrete in advance.Pour to stigma
Behind bottom surface, top laitance is cleared up, then casting concrete exceed New-old concrete joint surface at least 100mm again, observation is separately
Both sides, after concrete flowing comes, in the concrete of both sides teeming below.
The present invention is affected due to lattice column occupy-place, causes indirectly reinforcing bar to configure overstocked situation, therefore vibrating head when vibrating
Diameter is excessive to be unfavorable for concrete vibration compacting, there is portion 50mm vibrating heads and is difficult to insertion and vibrate, therefore project management department should match somebody with somebody simultaneously
Standby 30mm minor diameter vibrating heads, smash operation for coordinating to pour, it is ensured that concrete pours the density smash.Pour when smashing, the slightly larger place in space is used
The insertion of 50mm vibrating heads is vibrated, and 30mm vibrations are then used at the position of vibrating that cannot insert 50mm shock clubs intensive for reinforcing bar instead
Rod, two kinds of specification vibrating heads are used in combination, it is ensured that what each was told somebody what one's real intentions are vibrate, and position fully can be vibrated, and obtain quality of vibrating
Ensure；
6 ）Form removal and maintenance
Concreting finish after when concrete strength reaches every square millimeter of 1N form removal again, and ensure form removal
Cheng Zhongzhu corner angle are injury-free, and template 4 adopts rubber belt sealing using plastic sheeting parcel maintenance, seam crossing after removing；
Reject stigma horn mouth
After concrete strength reaches 75%, any excess concrete at 8 outside funnel pressure injection entrance 7 of stigma is rejected, to avoid the old and new
There is crack in concrete joint surface, forbids using machineries such as pneumatic picks when picking chisel, all using manually picking chisel and preliminary with post surface
It is smooth, then concrete surface fine chipping is carried out by artificial stone with textures cut with an axe technique with axe, finally by four external corner angle grinders of pillar
Wear into the external corner of Founder.
Embodiment 1:
Wenzhou build Business Building engineering basement post it is secondary pour smash employ this engineering method construction.Engineering is located at Wenzhou City
Lucheng District, 57208.1 ㎡ of overall floorage, wherein 35315.3 ㎡, 21892.8 ㎡ of underground on the ground.The long 81m in foundation ditch north-south, east
West is to wide 98m, foundation ditch girth 358m, 7938 ㎡ of excavation area, cutting depth about 12.7-13.6 rice, three layers of basement, using this
After engineering method operation, both reduced and poured the generation for smashing rear pillar crack and voids and pits, significantly improved new and old concrete seam crossing quality again,
Once survive, reduce the trouble of later stage repairing, be the basis that project has established wound high grade project.
Embodiment 2：
Wenzhou Medical University's eye employs the construction of this engineering method depending on Guang Yijiao buildings reconstruction and extension project.Engineering is located at Wenzhou City Lucheng City
Area, 49181.3 ㎡ of overall floorage.Superstructure is 22 layers of main building and 5 layers of annex.Basement be two layers, be integrally under
Room.This engineering belongs to frame-shear structure, raft foundation, and basement has post core lattice column and needs the secondary pillar smash that pours to have 94
Root.Through the data acquisition to after-pouring post quality problems, once pour and smash qualification rate and be obviously improved, including voids and pits, crack,
Swollen mould, rotten, the quality problems such as hole all significantly reduce, improve post casting pounding quality.
Claims (9)
1. precompressed construction method is poured into a mould after basement top-down method shaft, one layer of Beam-Slab Construction, then basement negative one of constructing first is completed
Layer beam slab, finally construction connect the negative one layer shaft of negative one layer beam slab and one layer of beam slab, and its construction technology is as follows：Pouring hole is stayed
Put, stigma and shaft treatment of construction joints, shaft formwork erection, Screw arbor with nut at both-ends are tightened precompressed, shaft concreting, form removal and supported
Shield and rejecting stigma horn mouth, it is characterised in that Specific construction technique is as follows：
1）Pouring hole indwelling：Beam slab and stigma are poured by design requirement, in order to later stage shaft concreting, stigma and beam slab are mixed
When solidifying soil is poured, on the Square consisting of two isosceles right-angled triangles of frame column position, pre-buried PVC sleeve pipes are used as reserved pouring hole；
2）Stigma and shaft treatment of construction joints：Capital face dabbing, post bottom surface concrete pick the pan bottom shape hole of concave up of chisel, while
Before casting and compacting of concrete, 30min pours a small amount of clear water into template, by template, lattice column and reinforcing bar abundant moistening, casting concrete
Before, one layer of stone mortar is first laid at post bottom surface；
3）Shaft formwork erection：In step 1）Funnel pressure injection entrance is installed in the stigma bottom poured, and funnel pressure injection entrance is by two
Funnel hang plate is separately fixed at and pours the template top of shaft concrete and obtain, and funnel pressure injection entry bottom is located at stigma bottom surface down
At 300mm, funnel pressure injection access opening top is located at stigma bottom surface up 200mm；
4）Screw arbor with nut at both-ends tightens precompressed：In step 3）Screw arbor with nut at both-ends is set on the funnel hang plate of installation, Screw arbor with nut at both-ends is tightened, profit
With Screw arbor with nut at both-ends precompressed before concrete initial set, make concrete push up power upwards, make after-pouring concrete effectively closely knit with top stigma seam crossing；
5）Shaft casting and compacting of concrete：, in 170-200mm, concrete segmentation is poured, concrete to pour concrete slump control when smashing
The primary height that pours is less than 600mm, and carries out again once after each concrete vibrating poured in height is closely knit
Pour, concreting to from stigma lower surface 280-320mm when stop pouring, 1 h of interval so that concrete settlement,
It is further continued for pouring remaining position concrete before concrete initial set；As bell mouth top is higher by 200mm than stigma bottom surface, using mixed
Solidifying soil deadweight and the principle of internal and external pressure balance, by new-old concrete junction vibration compacting, reduce the generation of handing-over seam；
6）Form removal and maintenance：After concreting is finished, the form removal again when concrete strength reaches every square millimeter of 1N, and
Ensure that form removal process center pillar corner angle are injury-free, using plastic sheeting parcel maintenance after form removable, seam crossing is close using adhesive tape
Envelope；
7）Reject stigma horn mouth：It is after concrete strength reaches 75%, artificial to reject stigma bell mouth any excess concrete, and and post
Surface is tentatively smooth, then carries out concrete surface fine chipping by artificial stone with textures cut with an axe technique with axe, finally by four external corners of pillar
The external corner of Founder is worn into angle grinder, construction is completed.
2. precompressed construction method is poured into a mould after basement top-down method shaft according to claim 1, it is characterised in that step 1）
Middle PVC casing diameters size is 140-160mm.
3. precompressed construction method is poured into a mould after basement top-down method shaft according to claim 1, it is characterised in that step 1）
Middle PVC casing diameters size is 150mm.
4. precompressed construction method is poured into a mould after basement top-down method shaft according to claim 1, it is characterised in that step 2）
Middle stone mortar laying depth is 50-100mm.
5. precompressed construction method is poured into a mould after basement top-down method shaft according to claim 1, it is characterised in that step 3）
Described in funnel pressure injection entrance inclined to be fixed on by funnel hang plate in 45 ° and pour the template top of shaft concrete and obtain, funnel pressure injection
Entrance pours height for 500mm, and width is 500mm, and length is the post length of side in bell mouth place face.
6. precompressed construction method is poured into a mould after basement top-down method shaft according to claim 1, it is characterised in that step 4）
Described in Screw arbor with nut at both-ends two ends and funnel hang plate junction be provided with cleat, padded by cleat.
7. precompressed construction method is poured into a mould after basement top-down method shaft according to claim 1, it is characterised in that step 5）
Middle puddling method is：Slowly pulled out using fast the inserting of immersion vibrator, insert evenly distributed, a pointwise movement, carry out in order, between movement
Away from for 300-400mm；Vibrate last layer when should insert lower-layer concrete face 50mm, to eliminate the seam of two interlayers.
8. precompressed construction method is poured into a mould after basement top-down method shaft according to claim 7, it is characterised in that concrete
Every vibrating time is 30-45s, is shaken after per interval 10-20min again.
9. precompressed construction method is poured into a mould after basement top-down method shaft according to claim 1, it is characterised in that step 5）
In to pour when smashing concrete slump be 180mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN108193706A (en) * | 2017-12-20 | 2018-06-22 | 中煤建工集团有限公司 | A kind of downward construction concrete pouring procedure of part contrary sequence method vertical structure |
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| CN106245680A (en) * | 2016-08-26 | 2016-12-21 | 中天建设集团有限公司 | Construction method is watered after contrary sequence method shaft precompressed |
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| CN108277818A (en) * | 2018-03-22 | 2018-07-13 | 中国电建市政建设集团有限公司 | Basement top-down method Combined tower crane foundation structure and construction method |
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| AU5586080A (en) * | 1980-02-25 | 1981-09-03 | Moore, C.D. | Reconditioning structural piling |
| JPH06317016A (en) * | 1991-03-15 | 1994-11-15 | Okabe Co Ltd | Formwork device for pillar |
| US5586080A (en) * | 1995-06-26 | 1996-12-17 | Micron Technology, Inc. | Local word line phase driver |
| AU2006201409A1 (en) * | 2005-04-12 | 2007-10-18 | William George Ross | Stump Former |
| CN2898153Y (en) * | 2006-04-18 | 2007-05-09 | 上海市第二建筑有限公司 | Concrete pouring tamping pole cap node by reversed construction |
| CN101139867B (en) * | 2006-09-08 | 2010-09-08 | 上海市第七建筑有限公司 | Pressure-grouting construction method for structure consolidation |
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| CN108193706A (en) * | 2017-12-20 | 2018-06-22 | 中煤建工集团有限公司 | A kind of downward construction concrete pouring procedure of part contrary sequence method vertical structure |
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