CN102936953B - Construction method of a bridging-arm stiffened steel structure template - Google Patents
Construction method of a bridging-arm stiffened steel structure template Download PDFInfo
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Abstract
The invention discloses a construction method of a bridging-arm stiffened steel structure template, and the construction method comprises the following steps of: 1) strapping the first stage of section steel column and diagonal bracing reinforcing steel bar of the bridging-arm stiffened steel structure which is 2.5 m above the ground; 2) mounting and reinforcing the first stage of template and support frame of the bridging-arm stiffened steel structure which is located 2.5 m above the ground; 3) casting the first stage of concrete of the bridging-arm stiffened steel structure which is 2.5 m above the ground; 4) performing the operations of the steps 1-3 on the second stage from the position 2.5 m above the ground to the bottom of the cross beam of the bridging-arm stiffened steel structure; 5) performing the operations of the steps 1-3 on the cross beam of the bridging-arm stiffened steel structure; and 6) performing the operations of the steps 1-3 on the upper part of the cross beam of the bridging-arm stiffened steel structure. According to the construction method, the bridging-arm stiffened steel structure is cast by a method of pouring the concrete four times, so that the working efficiency can be improved and the construction period can be shortened.
Description
Technical field
The present invention, about a kind of template construction method, refers in particular to one " greatly " font strength steel work template construction method.
Background technology
Steel reinforced concrete structure is also called steel composite construction or Baogang's concrete structure, is the steel-concrete combined structure wrapping up the formation of one deck concrete casing in the outside of formed steel construction.Steel reinforced concrete can make multiple component, more can form various structures.The external wrapping concrete of reinforced concrete composite structure can prevent the cripling of steel beam column and can improve the integral rigidity of steel work, the remarkable plane torsion flexural property improving steel work, make slightly being fully played of steel, concrete adds durability and the refractoriness of structure in addition.Steel reinforced concrete structure is widely used because of its These characteristics in many highrise buildings and communal facility, but its construction technical requirement is high, the feature that difficulty of construction is large, architectural especially at some complicated structures is the research direction of many units in charge of construction emphasis always.
Summary of the invention
Because the problems referred to above, the invention provides one " greatly " font strength steel work template construction method, comprise the following steps:
1) described in colligation, " greatly " font strength steel work plays steel column and the diagonal brace reinforcing bar of the first stage at 2.5m place to ground;
2) described " greatly " font strength steel work of reinforcing plays the first stage at 2.5m place formwork and formwork supports frame to ground is installed;
3) described " greatly " font strength steel work plays the first stage at 2.5m place concrete to ground is built;
4) second stage of described " greatly " font strength steel work from ground bottom 2.5m place to crossbeam carry out step 1 ~ operation of 3;
5) crossbeam of described " greatly " font strength steel work carry out step 1 ~ operation of 3;
6) step 1 carry out ~ operation of 3 in the crossbeam top of described " greatly " font strength steel work.
Further, during colligation steel column reinforcing bar, at the inner side of reinforcing bar main muscle welding spacer bars, its longitudinal pitch is 2 meters.
Further, during colligation steel column reinforcing bar, colligation topping cushion block on the perpendicular muscle crust of steel column, its spacing is 1000mm, and this topping cushion block adopts plastic cushion.
Further, during colligation crossbeam reinforcing bar, at the soffit welding location cross-arm reinforcing bar of crossbeam reinforcing bar, and at the bottom of beam, set up the support for reinforcing bar at the bottom of temporary support beam.
Further, during colligation crossbeam reinforcing bar, adopt pea gravel concreten cushion block or plastic cushion bottom beam, side adopts plastic clip as topping cushion block.
Further, install vertical rod as support in diagonal brace both sides and bottom, diagonal brace both sides vertical pole ' s span is 1.3m, and vertical rod is along diagonal brace span direction spacing 0.95m, horizontal step pitch 1.5m; Establish 2 load-bearing vertical rods at the bottom of diagonal brace, load-bearing vertical rod, along diagonal brace span direction spacing 0.55m, load-bearing one kind poles jacking is arranged two steel pipe master stupefied.
Further, install vertical rod as support in crossbeam both sides and bottom, beam both sides vertical pole ' s span 2m, vertical rod is along beam span direction spacing 0.95m; Establish 2 at the bottom of beam to the load-bearing vertical rod on ground, load-bearing vertical rod, along beam span direction spacing 0.55m, load-bearing one kind poles jacking is arranged two steel pipe master stupefied.
Further, when diagonal brace concreting, the spacing reserved degree of depth on diagonal brace according to vertical rod is the hole slot of 80mm; After diagonal brace form removal, meet curing time >=install vertical rod again after 7 days, and add 2 road diagonal brace rod members with support force at the bottom of stiffening girder.
Further, outermost both sides push rod at the bottom of beam, arranges the vertical bridging of continuous print along beam span direction, to strengthen the stability of support system.
The beneficial effect of the present invention " greatly " font strength steel work template construction method is:
(1) method of four concretings is adopted to build " greatly " font steel reinforced concrete structure.First the steel column of below 2.5m and diagonal brace are built, then the steel column bottom 2.5 to crossbeam and diagonal brace are built, then crossbeam is built, finally build crossbeam top steel column.To treat before concreting that the concrete strength of front one-time-concreting reaches 1.2N/mm
2, about 4-7 days time.This period can carry out next step reinforcing bar binding and model sheetinstallat.The efficiency of work can be improved like this, the reduction of erection time.
(2) the setting up of cross beam support frame.When diagonal brace concreting, the spacing reserved degree of depth on diagonal brace according to vertical rod is the hole slot of 80mm; After diagonal brace form removal, meet curing time >=install vertical rod again after 7 days, and add 2 road diagonal brace rod members with support force at the bottom of stiffening girder.By means of diagonal brace, load is sent to bottom.Engineering material and manpower are saved.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention " greatly " font strength steel work template construction method.
Fig. 2 is the section construction schematic diagram of the present invention " greatly " font strength steel work template construction method.
Fig. 3 is the sandwiched schematic diagram of the cross-arm reinforcing bar of the present invention " greatly " font strength steel work template construction method.
Fig. 4 is the elevation of the form bracing system of the present invention " greatly " font strength steel work template construction method.
Fig. 5 is the lateral view of Fig. 4.
Detailed description of the invention
The construction point of the present invention " greatly " font strength steel work template construction method is:
(1) pouring order of concrete problem is solved
To concrete quality requirement, not only to have correct profile, and good intensity, density and globality will be obtained.Therefore in construction, how to guarantee that concrete quality is a very important problem.Heavy section steel concrete structure, because its complex model and node cannot complete by one-time-concreting, needs to carry out the division of building node.The partitioning site held water can not only reduce concrete waste, and can play saving manpower and the effect of reduction of erection time." greatly " font steel reinforced concrete structure, because its top crossbeam is from great, during concreting, not only to consider shaping after quality, more to guarantee the safety problem in casting process.
(2) the support problem of crossbeam
" greatly " font steel reinforced concrete, section steel beam deadweight in top is comparatively large, must have enough supports to guarantee to be perfectly safe.There is twice diagonal brace bottom because of it, affects its supporting and space, is unfavorable for the layout of steel pipe.Diagonal brace has influence on operating surface simultaneously, makes operating surface become narrow and small, is unfavorable for the construction of workman.
(3) concrete Forming Quality problem
Steel reinforced concrete structure node is many, and component is complicated.Because its reinforcing bar is intricate and have again shaped steel to exist, the reinforcing bar gathered produces certain impact to the cleaning of template and concrete vibrating.
(4) the reinforcing problem of template
Because of the existence of beam column component Shaped Steel, the reinforcing of column template, side template cannot adopt the reinforcing of split bolt, and because of the larger reason of its beam column, side form pressure in the process of concreting is larger.Need to select a kind of suitable method reinforcing template to ensure the safety of building.
Coordinate referring to shown in Fig. 1, be the flow chart of the present invention " greatly " font strength steel work template construction method, comprise the following steps:
1) coordinate referring to shown in Fig. 2, first described in colligation, " greatly " font strength steel work plays steel column and the diagonal brace reinforcing bar of the first stage 10 at 2.5m place to ground;
2) described " greatly " font strength steel work of reinforcing plays the first stage 10 at 2.5m place formwork and formwork supports frame to ground is installed;
3) described " greatly " font strength steel work plays the first stage 10 at 2.5m place concrete to ground is built;
4) second stage 20 of described " greatly " font strength steel work from ground bottom 2.5m place to crossbeam carry out step 1 ~ operation of 3; That is,
The steel column of the second stage 20 of " greatly " font strength steel work from ground bottom 2.5m place to crossbeam described in colligation and diagonal brace reinforcing bar;
The formwork and formwork supports frame reinforcing the described second stage 20 of " greatly " font strength steel work from ground bottom 2.5m place to crossbeam is installed;
Build the concrete of the described second stage 20 of " greatly " font strength steel work from ground bottom 2.5m place to crossbeam.
5) crossbeam 30 of described " greatly " font strength steel work carry out step 1 ~ operation of 3; That is,
The steel column of " greatly " font strength steel structure beam 30 described in colligation and diagonal brace reinforcing bar;
The formwork and formwork supports frame reinforcing described " greatly " font strength steel structure beam 30 is installed;
Build the concrete of described " greatly " font strength steel structure beam 30.
6) step 1 carry out ~ operation of 3 in the crossbeam top 40 of described " greatly " font strength steel work.That is,
The steel column on " greatly " font strength steel structure beam top 40 described in colligation and diagonal brace reinforcing bar;
The formwork and formwork supports frame reinforcing described " greatly " font strength steel structure beam top 40 is installed;
Build the concrete on described " greatly " font strength steel structure beam top 40.
Wherein, when carrying out the colligation of steel column reinforcing bar, should note following some:
1) release the position line of post according to axis, check the position of the main muscle of post one by one, determine that its protective layer thickness meets the requirements, the distance between adjacent main muscle is even.
2) at the inner side of reinforcing bar main muscle welding spacer bars, its longitudinal pitch controls at 2 meters, and location dimension is determined by modes such as messenger wires.
3) spacer bars specification selects the size according to column section to determine.Choose the main muscle in two, each side of post as the main muscle in location (usually do not choose the main muscle in corner of post, because this main muscle connects in advance, the crotch affecting stirrup is in place).The main muscle of this part is connected, and firm with spacer bars colligation.
4) height of stirrup colligation should select the height facilitating main muscle to connect to be advisable (highly too high main muscle connects inconvenience, affects stirrup colligation next time after highly low main muscle connects).Stirrup corner and main muscle intersection point all want colligation, and main muscle becomes plum blossom to interlock colligation with the joining of the non-corner of stirrup.The superimposed place of crotch of stirrup should along pillar corner interlaced arrangement, and colligation is firm.The lacing wire that stirrup is arranged should hook stirrup.Main muscle injects in stirrup from the top down, is connected with lower connector.Main muscle connect from one jiao outside post continuously by bar connecting, have main muscle to connect and carry out comprehensive colligation in time afterwards.
5) install topping cushion block, cushion block should be tied up on column vertical rib crust, spacing 1000mm, and cushion block adopts special plastic cushion.Concealment acceptance is carried out after self-inspection is qualified.
When carrying out the reinforcing bar binding of crossbeam, should note following some:
1) steel beam surface must be cleaned out, and checks the operating platform of construction operation, sets up firm, protection safety.
2) according to height and the horizontal level of beam absolute altitude and axial location determination beam face reinforcing bar.Coordinate referring to shown in Fig. 3, at the soffit welding location cross-arm reinforcing bar 50 of beam face reinforcing bar, and set up bottom it and before stirrup colligation, main muscle is propped for the support 60(of reinforcing bar at the bottom of temporary support beam, main muscle is higher than design attitude, and the position of support can not affect cover stirrup simultaneously).
3) large diameter reinforcing bar selected by cross-arm reinforcing bar, and the diameter according to beam main tendon determines its longitudinal pitch, guarantees that main muscle does not drop and is as the criterion.
4) the main muscle in interior stirrup is first installed, after interior stirrup installation, the more main muscle in installing outside stirrup.First reinforcement installation at the bottom of beam is carried out, then mounting rail face reinforcing bar.At the bottom of beam face or beam, reinforcing bar is all placed on a row, does not allow two placing of reinforcements (two placing of reinforcements affect the reinforcement installation position of other direction).
5) stirrup is made as whole stirrup, and the main muscle in both sides, beam face draws location point according to design pitch.The opening of stirrup is placed on beam face, and adjacent apertures staggers placement.Be enclosed within after stirrup pulls open from bottom to top on beam main tendon, simultaneously by stirrup top and main muscle colligation firm.Stirrup colligation will by firm for the whole colligation of intersection point of stirrup and main muscle, waist muscle.After interior stirrup installation, by the waist muscle colligation near interior stirrup side on stirrup, outer side waist muscle is temporarily fixed on stirrup, carries out colligation after the whole colligation of outer stirrup and put in place.Outer stirrup colligation is identical with interior stirrup way, and after colligation, colligation steel tie, finally falls beam bottom reinforcement bars on stirrup and colligation is firm.
6) thickness of concrete cover of Reinforcement should meet designing requirement.The control measure of thickness of protection tier generally adopt pea gravel concreten cushion block or plastic cushion bottom beam, and side adopts plastic clip.
When carrying out diagonal brace bottom support and setting up, coordinate referring to shown in Fig. 4, install vertical rod 70 in diagonal brace both sides and bottom as support, diagonal brace both sides vertical pole ' s span is 1.3m, and vertical rod is along diagonal brace span direction spacing 0.95m, horizontal step pitch 1.5m; Establish 2 load-bearing vertical rods (adjustable bracket vertical applied force) at the bottom of diagonal brace, load-bearing vertical rod, along diagonal brace span direction spacing 0.55m, load-bearing one kind poles jacking is arranged the two steel pipe master of Φ 48.3 × 3.2mm stupefied; Horizon bar is connected with vertical rod and adopts two fastener to install.
When carrying out diagonal brace formwork reinforcement, establishing perpendicular stupefied 6 in diagonal brace breadth of section direction, reinforcing with the split bolt of one M12@400mm in diagonal brace; Establish perpendicular stupefied 7 in diagonal brace depth of section direction, reinforce with the split bolt of one M12@400mm in post; Owing to containing shaped steel in diagonal brace, split bolt to wearing, cannot adopting point to be welded on steel column and reinforcing, occurring than being easier to the mould phenomenon that rises.So tie adopts No. 10 separation 400mm to install.
When carrying out crossbeam bottom support and setting up, coordinate referring to shown in Fig. 4, install vertical rod 70 in crossbeam both sides and bottom as support, beam both sides vertical pole ' s span 2m, vertical rod is along beam span direction spacing 0.95m; Horizon bar is directed radially through extension two and processes across overlapping with plate range level pull bar.Establish 2 load-bearing vertical rods to ground (adjustable bracket vertical applied force) at the bottom of beam, load-bearing vertical rod, along beam span direction spacing 0.55m, coordinates referring to shown in Fig. 5, and when diagonal brace concreting, the spacing reserved degree of depth on diagonal brace according to vertical rod is the hole slot 80 of 80mm; After diagonal brace form removal, meet curing time >=7d after install vertical rod again, and add 2 road diagonal brace rod members with support force at the bottom of stiffening girder.Hound is pressed high-supported formwork vertical pole ' s span@550mm and is arranged, and adopts anti-skidding pair of fastener to connect, and requires to be no less than 3 tie points with support body.Load-bearing one kind poles jacking is arranged the two steel pipe master of Φ 48.3 × 3.2mm stupefied.Horizon bar is connected with vertical rod and adopts two fastener.In addition, outermost both sides push rod at the bottom of overweight beam crossbeam beam, arranges the vertical bridging 90 of continuous print, to strengthen the stability of support system along beam span direction.
When carrying out the installation and removal of template, should note following some:
1) template surface contacted with concrete should conscientious brushing release agent, must not holiday, as being caught in the rain after brushing, should mend brush release agent.
2) during form removal, to prize gently, make template depart from concrete surface, forbid suddenly pounding banging, prevent from breaking concrete.
3) template under removing should be cleaned out in time, brushing release agent.Temporarily the used time does not answer Shad density, prevents from being exposed to the sun.
When carrying out concreting, should note following some:
1) during concreting, because reinforcement ratio is closeer on its node, common vibrating head cannot go deep into, so the portable vibration rod choosing φ 35 vibrates.
2) secondary connects the place of raft, beam, the residual slurry of post end opening, laitance is cleaned out before a last layer template; When building next layer concrete, fix the thick batten of the wide 20mm of 20mm in its template inner peripheral suitable for reading, to make on the concrete after building interruption-forming convex when installing last layer template end opening just can with concrete surface close contact.
The present invention " greatly " font strength steel work template construction method adopts the method for four concretings to build " greatly " font steel reinforced concrete structure.First the steel column of below 2.5m and diagonal brace are built, then the steel column bottom 2.5 to crossbeam and diagonal brace are built, then crossbeam is built, finally build crossbeam top steel column.To treat before concreting that the concrete strength of front one-time-concreting reaches 1.2N/mm
2, about 4-7 days time.This period can carry out next step reinforcing bar binding and model sheetinstallat.The efficiency of work can be improved like this, the reduction of erection time.
The above is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, not departing from the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (7)
1. " greatly " font strength steel work template construction method, is characterized in that comprising the following steps:
1) described in colligation, " greatly " font strength steel work plays steel column and the diagonal brace reinforcing bar of the first stage at 2.5m place to ground;
2) described " greatly " font strength steel work of reinforcing plays the first stage at 2.5m place formwork and formwork supports frame to ground is installed;
Wherein, when carrying out diagonal brace bottom support and setting up, install vertical rod as support in diagonal brace both sides and bottom, diagonal brace both sides vertical pole ' s span is 1.3m, and vertical rod is along diagonal brace span direction spacing 0.95m, horizontal step pitch 1.5m; Establish 2 load-bearing vertical rods at the bottom of diagonal brace, load-bearing vertical rod, along diagonal brace span direction spacing 0.55m, load-bearing one kind poles jacking is arranged two steel pipe master stupefied;
3) described " greatly " font strength steel work plays the first stage at 2.5m place concrete to ground is built;
4) second stage of described " greatly " font strength steel work from ground bottom 2.5m place to crossbeam carry out step 1 ~ operation of 3;
5) crossbeam of described " greatly " font strength steel work carry out step 1 ~ operation of 3;
Wherein, when carrying out crossbeam bottom support and setting up, install vertical rod as support in crossbeam both sides and bottom, beam both sides vertical pole ' s span 2m, vertical rod is along beam span direction spacing 0.95m; Establish 2 at the bottom of beam to the load-bearing vertical rod on ground, load-bearing vertical rod, along beam span direction spacing 0.55m, load-bearing one kind poles jacking is arranged two steel pipe master stupefied;
6) step 1 carry out ~ operation of 3 in the crossbeam top of described " greatly " font strength steel work.
2. " greatly " font strength steel work template construction method as claimed in claim 1, when it is characterized in that colligation steel column reinforcing bar, at the inner side of reinforcing bar main muscle welding spacer bars, its longitudinal pitch is 2 meters.
3. " greatly " font strength steel work template construction method as claimed in claim 2, when it is characterized in that colligation steel column reinforcing bar, colligation topping cushion block on the perpendicular muscle crust of steel column, its spacing is 1000mm, and this topping cushion block adopts plastic cushion.
4. " greatly " font strength steel work template construction method as claimed in claim 1, when it is characterized in that colligation crossbeam reinforcing bar, at the soffit welding location cross-arm reinforcing bar of crossbeam reinforcing bar, and sets up the support for reinforcing bar at the bottom of temporary support beam at the bottom of beam.
5. " greatly " font strength steel work template construction method as claimed in claim 4, when it is characterized in that colligation crossbeam reinforcing bar, adopts pea gravel concreten cushion block or plastic cushion bottom beam, and side adopts plastic clip as topping cushion block.
6. " greatly " font strength steel work template construction method as claimed in claim 1, is characterized in that when diagonal brace concreting, and the spacing reserved degree of depth on diagonal brace according to vertical rod is the hole slot of 80mm; After diagonal brace form removal, meet curing time >=install vertical rod again after 7 days, and add 2 road diagonal brace rod members with support force at the bottom of stiffening girder.
7. " greatly " font strength steel work template construction method as claimed in claim 1, is characterized in that outermost both sides push rod at the bottom of beam, arranges the vertical bridging of continuous print along beam span direction, to strengthen the stability of support system.
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| CN105544552B (en) * | 2015-11-30 | 2017-07-21 | 中国一冶集团有限公司 | The device and method of deep foundation pit reinforced concrete inner support bed die soft soil foundation backing plate |
| CN107326939B (en) * | 2017-06-01 | 2019-07-26 | 中铁十六局集团北京轨道交通工程建设有限公司 | A kind of underground continuous wall connector H profile steel welding template construction device and method |
| CN110439279B (en) * | 2018-05-02 | 2023-09-08 | 深圳市胜德建筑科技有限公司 | Floating window template reinforcing system and construction method thereof |
| CN110512866B (en) * | 2019-08-14 | 2024-04-26 | 中交二航局第四工程有限公司 | Construction structure and construction method for supporting beam |
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