CN108360821A - A kind of construction method of beam - Google Patents
A kind of construction method of beam Download PDFInfo
- Publication number
- CN108360821A CN108360821A CN201810123361.3A CN201810123361A CN108360821A CN 108360821 A CN108360821 A CN 108360821A CN 201810123361 A CN201810123361 A CN 201810123361A CN 108360821 A CN108360821 A CN 108360821A
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- Prior art keywords
- construction method
- reinforcing steel
- presstressed reinforcing
- template
- construction
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The present invention relates to a kind of construction method of beam, the construction method of the beam includes the following steps：The tied framework reinforcing bar on building bottom plate, to form the frame of beam；It is anchored on template is edge-on on the frame of the beam, to build cast-in-place concrete model, wherein the template is spliced by multiple subtemplates；The lashing presstressed reinforcing steel in the cast-in-place concrete model；To the cast-in-place concrete model disturbing concrete；Presstressed reinforcing steel described in tensioning.The template of the beam is spliced by multiple subtemplates, has refined the construction of beam, to increase the span of the beam；The present invention is also set not only to have the characteristics that in terms of construction easy for construction, simple, save a large amount of man power and material, and have the characteristics that strong operability, simple structure, speed of application are fast, the present invention also requires construction environment low simultaneously, especially suitable for the stronger place of the corrosivity such as natatorium.The present invention application aspect also have the characteristics that structure it is durable, fire prevention and it is safe to use.
Description
Technical field
The present invention relates to the realm of building construction, more particularly to a kind of construction method of beam.
Background technology
Prestressing force has been applied to comprehensive stadiums, vehicle as the important measures for realizing large-span space structure
It stands, in the large-span space structures such as movie theatre, prestressed large-span space technology have passed through multiple authentication simultaneously throughout the country at present
It uses.
Existing large span space construction technology majority also uses monoblock type template, and monoblock type template area is big, and shape
Single, in the long-span beams that environment is complicated, structure durability is more demanding, there are limitations for monoblock type template；The prior art
Central sill can realize that maximum span is 36 meters, high building be required for span and stress, there are still limitations.
Therefore, be badly in need of exploitation Span Beam new construction method, with solve in the prior art Span Beam durability not enough, across
The problem of degree and understrressing.
Invention content
The purpose of the present invention is to provide a kind of construction method of beam, to solve in the prior art, Span Beam durability is not
The problem of enough, span and understrressing.
In order to solve the problems in the existing technology, the present invention provides a kind of construction method of beam, the beam is applied
Work method includes the following steps：
S1：The tied framework reinforcing bar on building bottom plate, to form the frame of beam；
S2：It is anchored on template is edge-on on the frame of the beam, to build cast-in-place concrete model, wherein the template
It is spliced by multiple subtemplates；
S3：The lashing presstressed reinforcing steel in the cast-in-place concrete model；
S4：To the cast-in-place concrete model disturbing concrete；
S5：Presstressed reinforcing steel described in tensioning.
Optionally, further include following steps before executing S3 after executing S2 in the construction method of the beam：
Lashing duct is opened up in cast-in-place concrete model, is laid with the ripple for housing the presstressed reinforcing steel in advance in the lashing duct
Pipe.
Optionally, it in the construction method of the beam, is attached using swagelok at the corrugated pipe connector.
Optionally, further include following steps before executing S3 in the construction method of the beam：To the prestressing force
Muscle carries out fracture processing.
Optionally, further include following steps before executing S4 after executing S3 in the construction method of the beam：
The end of the presstressed reinforcing steel is installed by anchorage.
Optionally, in the construction method of the beam, the anchorage includes anchor plate.
Optionally, further include following steps before executing S5 in the construction method of the beam：Remove the template.
Optionally, in the construction method of the beam, it is at the time of executing S5：Reach 80% in the concrete strength~
When 90%.
Optionally, further include following steps after executing S5 in the construction method of the beam：Grouting.
Optionally, in the construction method of the beam, the presstressed reinforcing steel includes steel strand wires.
In the construction method of beam provided by the invention, the presstressed reinforcing steel is laid by way of concrete binding,
Make the present invention application aspect have the characteristics that structure it is durable, prevent fires and it is safe to use.The template of the cast-in-place concrete model
It by modularization making, is spliced by multiple subtemplates, has refined the work progress of the beam, to increase the beam
Span realizes and reaches as high as 42 meters of span；Also make the present invention that not only there are the spies such as easy for construction, simple in terms of construction
Point saves a large amount of man power and material, and has the characteristics that strong operability, simple structure, speed of application are fast, while this
Invention is also low to construction environment requirement, especially suitable for the stronger place of the corrosivity such as natatorium.
The present invention on the basis of existing technology, by the optimization of a series of research of technique and node, improve greatly across
It spends in beam work progress from the problems such as great, construction quality is difficult to control.
Description of the drawings
Fig. 1 is the girder construction schematic diagram of the embodiment of the present invention；
Fig. 2 is structural schematic diagrams of the Fig. 1 along the directions A-A of the embodiment of the present invention；
Fig. 3 is the beam sectional view schematic diagram of the embodiment of the present invention；
Wherein, 1- anchorages；2- anchor plates；3- stirrups；4- skeleton reinforcing steel bars；5- presstressed reinforcing steels.
Specific implementation mode
The specific implementation mode of the present invention is described in more detail below in conjunction with schematic diagram.According to following description and
Claims, advantages and features of the invention will become apparent from.It should be noted that attached drawing is all made of very simplified form and
Using non-accurate ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
It please refers to Fig.1, the girder construction schematic diagram that Fig. 2 and Fig. 3, Fig. 1 are the embodiment of the present invention；Fig. 2 is the embodiment of the present invention
Fig. 1 along the directions A-A structural schematic diagram；Fig. 3 is the beam sectional view schematic diagram of the embodiment of the present invention.
The present invention provides a kind of construction method of beam, the construction method of the beam includes the following steps：
S1：It is laid with bottom plate, single main reinforcement and stirrup 3 up and down is bound, constructs the frame of the beam.
Then fixing bracket reinforcing bar, when construction on the stirrup 3 that binding is completed, according to the span centre marked in project blue print
Height and inflection point horizontal distance, determine holder reinforcing bar height；The holder reinforcing bar is used to support reinforcing bar, control concrete component
Middle bar spacing etc..The holder reinforcing bar uses 10 or more reinforcing bars of Φ, level interval about 1000mm, width and the beam stirrup 3
It is of same size.Holder described in the present embodiment uses and sets up socket joint type disk button bent structure, the socket joint type disk on framed bent
Button bent structure has the characteristics that rigidity is big, intensity is high, stability is big, simple to each stages operating such as dismounting from setting up, using
Just, a large amount of man power and material can be saved.
S2：It is anchored on template is edge-on on the frame of the beam, to build cast-in-place concrete model, wherein the template
It is spliced by multiple subtemplates.
In the work progress of the girder construction, the template is spliced by multiple subtemplates, takes segmentation piecemeal system
The method of work and lifting construction, modularization making is all made of from installation is fabricated into.
Preferably, the huge I-beam of large span post-stretching is to create large space regional structure, large span space at present
Structure can reach 36 meters of span substantially.The long-span beams span that this project uses alreadys exceed conventional 36 meters, thus section compared with
Greatly, it is to mitigate floor dead weight as far as possible, while ensureing the enough rigidity of flooring, therefore sectional dimension is big, stress is smaller part is gone
Fall, non-framework beam minimizes depth of section at the bearing of both ends, the weight to be born of the beam is reduced to the greatest extent, through the present invention to institute
After stating beam optimization, dead weight reduces by 10~20%.Not only do not interfered with the pressure value that the joist support is received, but also alleviated the beam itself
Weight plays the role of increasing the span.
The present invention using standardization, modular construction system and is subtracted by the optimization of a series of research of technique and node
Few beam weight of itself, the duration is tight, labour cost is high, template system in effective solution large span, variable-section beam structure construction
Make the problems such as inconvenient；Also so that the span of heretofore described beam can reach 42 meters, considerably beyond present span length.
In the construction method for the beam that the embodiment of the present invention is provided, after executing S2, before executing S3, also wrap
Include following steps：Lashing duct is opened up in cast-in-place concrete model, is laid in advance in the lashing duct accommodating described pre-
The bellows of stress rib 5.
Preferably, the beam uses round plastic bellows, the curve between inflection point and span centre to hang naturally.It is installing
Before bellows it needs to be determined that on the beam 5 duct of presstressed reinforcing steel described in lashing height.Then bellows is laid.Before lashing first
5 end of the presstressed reinforcing steel is packed tightly with friction tape, avoids poking the bellows during lashing.
Further, since the span of the beam is bigger, there is a situation where that the Bellows Length is inadequate, therefore described
Bellows needs connector, and joint uses, length bigger 5mm than work pipe diameter to be attached for the swagelok of 300mm, described
It must be sealed with sealant tape at corrugated pipe connector.
In the construction method of the beam, the presstressed reinforcing steel 5 will calculate its length before lashing, avoid waste material
Material；The length for calculating the presstressed reinforcing steel 5 needs to consider the orifice throat length of the beam, and the thickness of the anchor plate 2 of end is opened
Required active length etc. obtains the length of the presstressed reinforcing steel 5 when stretching long value and tensioning.
When carrying out fracture to the presstressed reinforcing steel 5, need to set up dedicated pay off rack by the presstressed reinforcing steel 5 with steel pipe
Disk is fixed, to prevent the pop-up of presstressed reinforcing steel 5 in unwrapping wire fracture.The basic phase of 5 length of the presstressed reinforcing steel in same duct
Together, classify by the number of the beam to the presstressed reinforcing steel 5 of different beams, different length specification.
S3：The lashing presstressed reinforcing steel 5 in the cast-in-place concrete model；Presstressed reinforcing steel 5 described in the present embodiment is using single
Root lashing；Then single presstressed reinforcing steel 5 is worn to the other end one end from the cast-in-place concrete model.
After the completion of bellows position described in the present embodiment fixes presstressed reinforcing steel 5 described in simultaneously lashing, in the prestressing force
5 end of muscle is installed by anchorage 1 and spiral bar etc..
Common, the anchorage 1 includes anchor plate 2.It is steeped with 100mm thickness between template and the anchor plate 2 in component
Foam is filled, and the anchorage 1 and the die plate are avoided.It is fixed, is prevented in disturbing concrete using regular reinforcement simultaneously
When, occur deviation phenomena such as.
S4：After 5 lashing of the presstressed reinforcing steel, to the cast-in-place concrete model disturbing concrete, so that described mixed
Solidifying soil fits closely together with the skeleton reinforcing steel bar 4 and the presstressed reinforcing steel 5 etc..Preferably, because the section of the beam is work
Font, middle section width are only 250mm, and concrete occurs in casting process in concrete in order to prevent can not pour to beam
Bottom, in the upper general coarse aggregate for selecting grain size smaller of concrete raw material selection.In addition the mode that pours of concrete is used from beam
The intermediate mode that pours toward both sides, the beam use placement layer by layer, 500mm are not more than per layer thickness, and ensure upper layer coagulation
Lower-layer concrete is not up to final set strength when soil pours, and is taken in concreting from the slow pouring construction in beam both sides, it is ensured that
5 duct of the presstressed reinforcing steel is not destroyed.
In the embodiment of the present invention, after the concrete strength of the beam reaches 80%~90%, to the presstressed reinforcing steel 5 into
Row tensioning.
S5：Presstressed reinforcing steel 5 described in tensioning.The tensioning of the presstressed reinforcing steel 5 includes the following steps：Preparation, technology core
It looks into, tensioning.
First, preparation is executed, the preparation includes removing the template of the beam, retains bottom plate and support.It goes
Except the extra bellows of the opening of the channel, and the mortar on pre-buried backing plate is cleared up, the anchor ring of the anchorage 1 is made to be directed at the duct
Simultaneously it is inserted in 5 beam of the presstressed reinforcing steel in center.
Then, it executes technology and verifies work, the technology verification includes to component ends built-in fitting, grout hole, concrete
It is equal to be verified comprehensively, and ensure that the tension sequence of the presstressed reinforcing steel 5 meets design requirement.
Finally, tensioning is carried out to the presstressed reinforcing steel 5, tensioning construction takes post-tensioned construction, both ends tensioning to apply
Work method, prestressed stretch-draw is taken based on tensioning value, 5 stretch value of presstressed reinforcing steel checks Construction control tensioning rhythm.Specifically apply
Work mode, device jack, jack should be hung on firm holder, and the position of the jack is adjusted, convenient for pushing away
Dynamic jack is drawn close the anchorage 1 and is aligned with duct center；The presstressed reinforcing steel 5 must marshalling when passing through jack；
For ease of moving back the intermediate plate for unloading the anchorage 1 automatically, a small amount of lubricating oil is coated on the anchoring clamping piece of the anchorage 1.It should be done when tensioning
It is aligned to duct, anchor ring with jack all centers, stretching process should be uniform.
The stressing sequence of the presstressed reinforcing steel 5 is：0 → 10% σ con of σ con (stretch value L1) → 20% (stretch value L2) →
100% σ con → hold lotus 2 minutes → σ con (measure stretch value L3) → → off-load to zero of noting down.
After prestressing force pulls, extra steel strand wires are cut using hand-held cut-off machine, make the exposing end anchorage 1
Outer steel strand wires length is not less than 30mm.Stretching end and its surrounding are cleaned out, with component peer microdilatancy microlith coagulation
Grave blocks up stretching end and vibration compacting.The anchorage 1 by surrounding concrete interface dabbing and is rinsed well before closing, configuration 2
8 bar-mat reinforcements of piece Φ, the bar-mat reinforcement and concrete members reserved joint bar drawknot.Preferably, the microdilatancy pea gravel concreten
Part and groove are poured after pouring stretching end, to protect the anchorage 1, the additive of chloride ion-containing must not be used in concrete, is kept away
Exempt to erode to reinforcing bar etc..
After prestressed stretch-draw, start duct grouting work at once.It needs to check prestressed component comprehensively before grouting
Whether duct and slurry-feeding hole, exhaust, osculum are unimpeded.Cement slurry enters before mudjack by the sieve no more than 5mm sieve pores
Filtering.The cement mortar match ratio of grouting predefines, must not arbitrarily plus water when slurrying, record grouting position, cement in grouting
Dosage.When each cementing operations, at least test cement mortar fluidity is secondary, and fluidity deviation is not greater than 20%.
Specifically, to carrying out mud jacking at the lashing duct and other gaps, in the anchorage 1, there may be needed at spillage
It is blocked with cement mortar.Grouting is carried out continuously, and is vented smoothness.After duct grouting after cement mortar initial set, from going out before final set
Pore passage dense situation is detected in slurry hole, bleeding hole etc. with probe.If in place of having local leakiness, can be used and manually or mechanically mend slurry
It tamps.After filling potential close gas vent, voltage stabilizing 1~2min rear enclosed grout holes.Preferably, using the clogging filling of one side glue
Starch hole.
Preferably, in the construction method of the beam, the presstressed reinforcing steel 5 includes steel strand wires, and the steel strand wires are by more
The twisted steel product constituted of root steel wire, prestress wire can be divided into 7,2,3 and 19 according to steel wire radical, most often
It is 7 structures, preferably 7 structures in the embodiment of the present invention.Single presstressed reinforcing steel 5 described in the present embodiment refers to 14
7 steel strand wires are a branch of, this branch of steel strand wires is carried out lashing.
To sum up, in the construction method of beam provided by the invention, to the presstressed reinforcing steel by way of concrete binding
Lay, make the present invention application aspect have the characteristics that structure it is durable, prevent fires and it is safe to use.The cast-in-place concrete model
Template is spliced by modularization making by multiple subtemplates, and the work progress of the beam has been refined, described to increase
The span of beam realizes and reaches as high as 42 meters of span；The present invention is also set not only to have in terms of construction easy for construction, simple etc.
Feature saves a large amount of man power and material, and has the characteristics that strong operability, simple structure, speed of application are fast, simultaneously
The present invention is also low to construction environment requirement, especially suitable for the stronger place of the corrosivity such as natatorium.The present invention is in the prior art
On the basis of, by the optimization of a series of research of technique and node, improve in long-span beams work progress from great, construction
The problems such as quality is difficult to control.Stress smaller portions in the beam section are eliminated in the present invention, both do not interfered with the joist support by
Pressure value, and the weight for alleviating beam itself plays the role of increasing the beam span.
The present invention is suitable for all kinds of prestressed large-span beam structure constructions, is particularly suitable for comprehensive venue and has large span
The Structural Engineering of space or high Clearance requirement.
The preferred embodiment of the present invention is above are only, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of not departing from technical scheme of the present invention, to the invention discloses technical solution and
Technology contents make the variations such as any type of equivalent replacement or modification, belong to the content without departing from technical scheme of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (10)
1. a kind of construction method of beam, which is characterized in that the construction method of the beam includes the following steps：
S1：The tied framework reinforcing bar on building bottom plate, to form the frame of beam；
S2：It is anchored on template is edge-on on the frame of the beam, to build cast-in-place concrete model, wherein the template is by more
A sub- template splicing forms；
S3：The lashing presstressed reinforcing steel in the cast-in-place concrete model；
S4：To the cast-in-place concrete model disturbing concrete；
S5：Presstressed reinforcing steel described in tensioning.
2. the construction method of beam as described in claim 1, which is characterized in that after executing S2, before executing S3, further include
Following steps：
Lashing duct is opened up in cast-in-place concrete model, is laid in advance in the lashing duct and is housed the presstressed reinforcing steel
Bellows.
3. the construction method of beam as claimed in claim 2, which is characterized in that at the corrugated pipe connector using swagelok into
Row connection.
4. the construction method of beam as described in claim 1, which is characterized in that further include following steps before executing S3：
Fracture processing is carried out to the presstressed reinforcing steel.
5. the construction method of beam as described in claim 1, which is characterized in that after executing S3, before executing S4, further include
Following steps：
Anchorage is installed in the end of the presstressed reinforcing steel.
6. the construction method of beam as claimed in claim 5, which is characterized in that the anchorage includes anchor plate.
7. the construction method of beam as described in claim 1, which is characterized in that further include following steps before executing S5：
Remove the template.
8. the construction method of beam as described in claim 1, which is characterized in that be at the time of executing S5：In the strong concrete
When degree reaches 80%~90%.
9. the construction method of beam as described in claim 1, which is characterized in that further include following steps after executing S5：
Grouting.
10. the construction method of beam as described in claim 1, which is characterized in that the presstressed reinforcing steel includes steel strand wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810123361.3A CN108360821A (en) | 2018-02-07 | 2018-02-07 | A kind of construction method of beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810123361.3A CN108360821A (en) | 2018-02-07 | 2018-02-07 | A kind of construction method of beam |
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| CN108360821A true CN108360821A (en) | 2018-08-03 |
Family
ID=63005253
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| CN201810123361.3A Pending CN108360821A (en) | 2018-02-07 | 2018-02-07 | A kind of construction method of beam |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109898866A (en) * | 2019-03-20 | 2019-06-18 | 中亿丰建设集团股份有限公司 | A kind of section construction has bonded post tensioning to draw prestressed girder both ends tension structure |
| CN111502117A (en) * | 2020-04-07 | 2020-08-07 | 中国建筑第八工程局有限公司 | Large-section row reserved hole building structure on prestressed structural beam and construction method |
| CN112982787A (en) * | 2021-02-08 | 2021-06-18 | 清华大学建筑设计研究院有限公司 | Large-span beam with reinforced concrete and prestressed inhaul cable coupled |
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| CN101476393A (en) * | 2008-11-28 | 2009-07-08 | 中铁二局股份有限公司 | Pretensioned prestressing stretch-drawing beam and its production method |
| CN101550724A (en) * | 2009-04-29 | 2009-10-07 | 中铁十局集团有限公司 | Construction method of large-span post-tensioned prestressed longitudinal and transverse frame beams |
| KR20140017248A (en) * | 2012-07-31 | 2014-02-11 | 권예지 | Corrugated steel plate web-psc composite beam and construction method of corrugated steel plate web-psc composite beam |
| CN106522561A (en) * | 2016-11-02 | 2017-03-22 | 中建八局第三建设有限公司 | Long-span concrete frame beam bonded prestressed post-cast strip inside stretching construction method |
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| CN101476393A (en) * | 2008-11-28 | 2009-07-08 | 中铁二局股份有限公司 | Pretensioned prestressing stretch-drawing beam and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109898866A (en) * | 2019-03-20 | 2019-06-18 | 中亿丰建设集团股份有限公司 | A kind of section construction has bonded post tensioning to draw prestressed girder both ends tension structure |
| CN109898866B (en) * | 2019-03-20 | 2020-11-06 | 中亿丰建设集团股份有限公司 | Two-end tensioning structure with bonded post-tensioning prestressed beam for sectional construction |
| CN111502117A (en) * | 2020-04-07 | 2020-08-07 | 中国建筑第八工程局有限公司 | Large-section row reserved hole building structure on prestressed structural beam and construction method |
| CN112982787A (en) * | 2021-02-08 | 2021-06-18 | 清华大学建筑设计研究院有限公司 | Large-span beam with reinforced concrete and prestressed inhaul cable coupled |
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Application publication date: 20180803 |