CN106607989A - Rail transit post-stressed U-shaped beam construction technique - Google Patents
Rail transit post-stressed U-shaped beam construction technique Download PDFInfo
- Publication number
- CN106607989A CN106607989A CN201611193404.2A CN201611193404A CN106607989A CN 106607989 A CN106607989 A CN 106607989A CN 201611193404 A CN201611193404 A CN 201611193404A CN 106607989 A CN106607989 A CN 106607989A
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- Prior art keywords
- steel strand
- strand wires
- steel
- tensioning
- construction process
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- 238000010276 construction Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- 230000002787 reinforcement Effects 0.000 claims abstract description 19
- 238000013461 design Methods 0.000 claims description 22
- 229920000742 Cotton Polymers 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 230000001680 brushing effect Effects 0.000 claims description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 239000008267 milk Substances 0.000 claims description 2
- 210000004080 milk Anatomy 0.000 claims description 2
- 235000013336 milk Nutrition 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000011148 porous material Substances 0.000 abstract description 3
- 239000004744 fabric Substances 0.000 abstract description 2
- 238000009415 formwork Methods 0.000 abstract 5
- 239000000463 material Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 210000002435 tendon Anatomy 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B15/00—General arrangement or layout of plant ; Industrial outlines or plant installations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/12—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed to form prestressed circumferential reinforcements
- B28B23/14—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed to form prestressed circumferential reinforcements by wrapping, e.g. winding, apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
Abstract
The invention discloses a rail transit post-stressed U-shaped beam construction technique. The technique comprises the following steps that reinforcement cage binding is conducted on a jig, and steel strand ducts are arranged in set positions of a reinforcement cage; the manufactured reinforced cage is hoisted into a bottom formwork and a side formwork, and the reinforcement cage and the steel strand ducts are detected and adjusted; an end formwork and an inner formwork are installed, and embedded parts are installed in set positions; concrete pouring is conducted, and a beam body is maintained through a maintenance device; steel strands are installed in the steel strand ducts, and the steel strands are tensioned in batches; and grouting is conducted on the steel strand ducts, and end capping and maintenance are conducted on the beam body. Standardized and industrialized production of U-shaped beams can be achieved, the project construction quality is guaranteed, and the production efficiency is remarkably improved. Lining cloth is arranged at chamfers of the inner formwork, and the problem of pores in the surface of the chamfers of the U-shaped beams is effectively solved.
Description
Technical field
The present invention relates to a kind of U-shaped girder construction process of track traffic post-tensioned prestressing.
Background technology
Prefabricated U-shaped beam, as a kind of base-supporting structure, with building structure is low, environmental friendliness, construction landscape adaptability
The advantages of construction of good, life-cycle and operation cost are low, system high efficiency rate is integrated, noise control performance is good；But U-shaped beam is a kind of large volume
Thin thickness structure, construction profile are complicated, and the presentation quality and speed of application that blibbing and crack cause is annoying extensively always
Big builder, it is necessary to seek a kind of quick, efficient, high-quality construction method.
The method for adopting existing highway traffic box beam or mining under railways at present the construction of U-shaped beam, this is easy for causing U beams more
Surface crack, it is therefore necessary to for the construction featuress of thin-walled U beams, seek a kind of construction method in the U-shaped beam crack of control.
The content of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of track traffic post-tensioned prestressing is U-shaped
Girder construction process, effectively reduces U-shaped beam surface pores, avoids U-shaped beam surface crack, reach quick, efficient and high-quality work
Journey purpose.The structural stress crack and non-stressed crack in U-shaped beam construction can be eliminated, the mass effect of high-quality is reached.
For achieving the above object, the present invention adopts following technical proposals：
The U-shaped girder construction process of track traffic post-tensioned prestressing, comprises the following steps：
Step 1：Tie with reinforcing bar is carried out on mold, and in framework of steel reinforcement setting position arrangement steel strand wires duct；
Step 2：The framework of steel reinforcement for completing is lifted to bed die and side form, adjustment framework of steel reinforcement and steel strand wires are checked
Duct；
Step 3：Side Template and inner template are installed, and built-in fitting is installed in setting position；
Step 4：Concreting is carried out, and beam body is conserved using curing means；
Step 5：Steel strand wires are installed in steel strand wires duct, tensioning is carried out to steel strand wires in batches；
Step 6：Steel strand wires duct is in the milk, cross girders body of going forward side by side is blocked and conserved.
In the step 1, transverse steel is positioned on the transverse steel locating groove of mold, longitudinal reinforcement is positioned over
On the longitudinal reinforcement locating groove of mold, tie with reinforcing bar is carried out.
In the step 2, bed die and side form are mounted on pedestal, and to bed die and side form brushing releasing agent.
In the step 3, cotton is pasted in the chamfering position of inner template, the thickness of cotton is 5-10mm；In inner template
Other positions brushing releasing agent.Cotton can also replace with other similar materials, but cotton most convenient, generally the least expensive.
In the step 4, before concreting, need to be to framework of steel reinforcement, bed die, side form, Side Template, inner template and built-in fitting
Checked.
In the step 4, when being conserved, according to the curing means that ambient temperature selects to adapt to：If ambient temperature is higher than
Setting value, selects spray system to conserve beam body；If ambient temperature is less than setting value, vapour system is selected to carry out beam body
Maintenance.
In the step 5, first beam body is lifted to beam strorage area, then steel strand wires are installed in steel strand wires duct, by U-shaped beam bottom
Portion is divided into four regions with what the symmetrical both sides of centrage were respectively symmetrically, is defined as N2, N3, N4, N5 from left to right successively, N5 ',
N4 ', N3 ', N2 ', two tops of U-shaped beam opening are respectively defined as N1, N1 ', then with pre- tensioning, initial tensioning and whole tensioning three
Stage carries out tensioning to steel strand wires in U-shaped beam, and tensioning adopts two ends synchronous tension, symmetrical to carry out.
The pretensioned operating process is：When concrete strength reaches the 60% of design load, to in beam body bottom
N4, N4 of the symmetrical both sides of heart line ', N2, N2 ' steel strand wires in region carry out being stretched to the first design load to set sequence synchronization.
The operating process of the initial tensioning is：When concrete strength reaches the 80% of design load, to in beam body bottom
N5, N5 of the symmetrical both sides of heart line ', N3, N3 ' steel strand wires in region carry out being stretched to the first design load to set sequence synchronization,
Age is carried out when being no less than 3 days.
The operating process of the whole tensioning is：The 100% of design load is reached in concrete strength, elastic modelling quantity reaches design
Value 100% when, to N1, N1 of the symmetrical both sides of beam body top centrage ' steel strand wires in region synchronously carry out being stretched to the
Two design loads, then by whole steel strand wires orders tensioning to the 3rd design load, age is carried out when being no less than 8 days.
In the step 6, vacuum aid grouting is carried out to steel strand wires duct in the 48h after the completion of tensioning；Press mortar
Steel strand wires duct should be pressed in 40min after completing.
Beneficial effects of the present invention are：
The present invention is capable of achieving the standardization of U-shaped beam, industrialization production, so ensures that engineering construction quality, significantly
Degree improve production efficiency.
The present invention arranges lining cloth at inner template chamfering, efficiently solves surface pores at U beam chamferings.
The present invention is selected using spray or steam curing according to ambient temperature, is played energy-saving and emission-reduction and is reduced desciccation crack
Produce.
The present invention adopts tensioning in batches, plays equalizing structure stress when prestressed stretch-draw is carried out to steel strand wires, reduces
The generation of stress crack.
Description of the drawings
Fig. 1 is the steel strand wires lateral arrangement figure of U-shaped beam of the invention；
Fig. 2 is that the steel strand wires of U-shaped beam of the invention are longitudinally arranged figure.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
The U-shaped girder construction process of the prefabricated post-tensioned prestressing of track traffic, comprises the steps of：
Step 1, after Steel Reinforcing Bar Material processing, on Special mould, carries out tie with reinforcing bar, and presses design drawing arrangement steel
Twisted wire duct；
Special mould, should arrange transverse steel locating groove and longitudinal reinforcement positioning by the reinforcement location in design drawing
Draw-in groove, the profile with U beams, with certain rigidity and enough stability；
Step 2, bed die, side form are installed on pedestal, brushing releasing agent；
Pedestal, should adopt armored concrete, and height 50cm, pedestal basis should be disposed, and under load action, uniformly need to sink
Drop or without sedimentation (job site is fairly simple, can ensure uniform settlement or without sedimentation)；
Step 3, after framework of steel reinforcement acceptance(check), integral hoisting enters in bed die and side form on pedestal, checks adjustment reinforcing bar
Skeleton and steel strand wires duct；
Step 4, installs Side Template；Cotton is pasted in inner template chamfering position, inner template other positions brushing releasing agent,
Then install, adjust inner template；
Cotton, using high, the white cotton with humidity-preserving type of thickness 5-10mm, water absorption, can both ensure concrete
Humidity, and the function with froth breaking；Pasting should smooth, smooth, corrugationless；
Step 5, according to built-in fitting handbook, installs, adjusts built-in fitting；
Built-in fitting handbook, be construction, supervisor by design drawing, and each Specialty Design heads of the unit of Jing confirm；
Step 6, checks to framework of steel reinforcement, template and built-in fitting, qualified to carry out concreting afterwards；
Check, be template position, releasing agent and each pre- to the examination before concreting, comprising bar spacing, protective layer
The quality of embedded part, quantity, position etc.；
Step 7, summer adopt spray system, winter to adopt vapour system, and beam body is conserved；
The vapour system that curing means, the spray equipment system comprising summer and winter adopt, with temperature automatically controlled and control
Wet function；
Step 8, beam body is lifted to beam strorage area；
Step 9, carries out tensioning to prestressing force in batches, cuts away unnecessary steel strand wires, closes anchor head；
Prestressed stretch-draw, was carried out by pre- tensioning, initial tensioning and whole three stage of tensioning in batches；
U-shaped beam bottom is divided into into four regions with what the symmetrical both sides of centrage were respectively symmetrically, is defined successively from left to right
For N2, N3, N4, N5, N5 ', N4 ', N3 ', N2 ', two tops of U-shaped beam opening are respectively defined as N1, N1 '；In i.e. U-shaped beam bottom
Be divided into N2, N3, N4, N5 on the left of heart line from left to right, be divided on the right side of U-shaped beam bottom centerline from left to right N5 ', N4 ', N3 ',
N2’。
Pre- tensioning is carried out after concrete strength reaches design load 60%, by N4, N4' → N2, N2' order, is stretched to
700MPa；
Initial tensioning should reach design load 80% in concrete strength, and age is carried out when being no less than 3 days, tensioning except pre- tensioning with
Outer steel beam (N4, N4', N2, N2'), then tensioning N5, N5' → N3, N3' to 700MPa in order；
Whole tensioning is after beam body concrete strength reaches 100% and elastic modelling quantity reaches 100%, and age is no less than 8
It when carry out, N1, N1' prestressing tendon tensioning to 1246.2MPa, by N5, N5' → N4, N4' → N3, N3' → N2, N2' → N1,
N1' order prestressing tendon tensioning is to 1339.2MPa；Operated with the order stretching mode of the present invention, it is not easy to go out crack, more
Can guarantee that U-shaped beam construction quality.
Prestressing adopts two ends synchronous tension, and it is symmetrical carry out, maximum imbalance beam is not to be exceeded 1 beam, applies in advance
Stress adopts dual control measure, should keep the elongation at two ends basically identical in stretching process.
Step 10, to steel strand wires duct grouting, maintenance, carries out beam body end-blocking, natural curing；
Grouting, should carry out pipeline vacuum Auxiliary Grouting in 48h after the completion of drawing eventually；Press mortar selects high-performance ungauged regions
Anti-corrosion grouting agent；Cement mortar stirring terminates to the time interval of press-in pipeline to be not to be exceeded 40min.
Step 11, Product Acceptance Review appear on the scene.
Product, it is necessary to reach design strength in beam body concrete strength, mud jacking slurry intensity, end-blocking concrete strength, side
Can appear on the scene.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
The various modifications made by needing to pay creative work or deformation are still within protection scope of the present invention.
Claims (10)
1. the U-shaped girder construction process of track traffic post-tensioned prestressing, is characterized in that, comprise the following steps：
Step 1：Tie with reinforcing bar is carried out on mold, and in framework of steel reinforcement setting position arrangement steel strand wires duct；
Step 2：The framework of steel reinforcement for completing is lifted to bed die and side form, adjustment framework of steel reinforcement and steel strand wires hole is checked
Road；
Step 3：Side Template and inner template are installed, and built-in fitting is installed in setting position；
Step 4：Concreting is carried out, and beam body is conserved using curing means；
Step 5：Steel strand wires are installed in steel strand wires duct, tensioning is carried out to steel strand wires in batches；
Step 6：Steel strand wires duct is in the milk, cross girders body of going forward side by side is blocked and conserved.
2. U-shaped girder construction process as claimed in claim 1, is characterized in that, in the step 1, transverse steel is positioned over tire
On the transverse steel locating groove of tool, longitudinal reinforcement is positioned on the longitudinal reinforcement locating groove of mold, framework of steel reinforcement is carried out
Colligation.
3. U-shaped girder construction process as claimed in claim 1, is characterized in that, in the step 2, bed die and side form are mounted on
On pedestal, and to bed die and side form brushing releasing agent.
4. U-shaped girder construction process as claimed in claim 1, is characterized in that, in the step 3, in the chamfering position of inner template
Cotton is pasted, the thickness of cotton is 5-10mm；In the other positions brushing releasing agent of inner template.
5. U-shaped girder construction process as claimed in claim 1, is characterized in that, in the step 4, when being conserved, according to environment
Temperature selects the curing means for adapting to：If ambient temperature is higher than setting value, spray system is selected to conserve beam body；If environment
Temperature is less than setting value, selects vapour system to conserve beam body.
6. U-shaped girder construction process as claimed in claim 1, is characterized in that, first beam body is lifted to beam strorage area, then in steel strand wires
Steel strand wires are installed in duct, U-shaped beam bottom are divided into into four regions with what the symmetrical both sides of centrage were respectively symmetrically, from left to right
N2, N3, N4, N5 are defined as successively, and N5 ', N4 ', N3 ', N2 ', two tops of U-shaped beam opening are respectively defined as N1, N1 ', then
Steel strand wires in U-shaped beam are carried out with tensioning with pre- tensioning, initial tensioning and whole tensioning three phases, tensioning adopts two ends synchronous tension,
It is symmetrical to carry out.
7. U-shaped girder construction process as claimed in claim 6, is characterized in that, the pretensioned operating process is：In concrete
When intensity reaches the 60% of design load, to N4, N4 of the symmetrical both sides of beam body bottom centerline, the steel in ', N2, N2 ' region is twisted
Line carries out being stretched to the first design load to set sequence synchronization.
8. U-shaped girder construction process as claimed in claim 6, is characterized in that, the operating process of the initial tensioning is：In concrete
When intensity reaches the 80% of design load, to N5, N5 of the symmetrical both sides of beam body bottom centerline, the steel in ', N3, N3 ' region is twisted
Line carries out being stretched to the first design load to set sequence synchronization, and age is carried out when being no less than 3 days.
9. U-shaped girder construction process as claimed in claim 6, is characterized in that, the operating process of the whole tensioning is：In concrete
Intensity reaches the 100% of design load, when elastic modelling quantity reaches the 100% of design load, to beam body top centrage it is symmetrical two
The steel strand wires in N1, N1 of side ' regions synchronously carry out being stretched to the second design load, then whole steel strand wires order tensioning are set to the 3rd
Evaluation, age are carried out when being no less than 8 days.
10. U-shaped girder construction process as claimed in claim 1, is characterized in that, the 48h in the step 6, after the completion of tensioning
It is interior that vacuum aid grouting is carried out to steel strand wires duct；Press mortar should be pressed into steel strand wires duct in 40min after completing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611193404.2A CN106607989A (en) | 2016-12-21 | 2016-12-21 | Rail transit post-stressed U-shaped beam construction technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611193404.2A CN106607989A (en) | 2016-12-21 | 2016-12-21 | Rail transit post-stressed U-shaped beam construction technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106607989A true CN106607989A (en) | 2017-05-03 |
Family
ID=58636621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611193404.2A Pending CN106607989A (en) | 2016-12-21 | 2016-12-21 | Rail transit post-stressed U-shaped beam construction technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106607989A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109291208A (en) * | 2018-10-29 | 2019-02-01 | 马鞍山钢铁建设集团有限公司 | A kind of large-span prestressed concrete T plate construction method |
| CN114458018A (en) * | 2022-02-25 | 2022-05-10 | 中国华西企业股份有限公司 | Prestress construction method |
| CN114657898A (en) * | 2022-02-19 | 2022-06-24 | 中铁二十局集团第六工程有限公司 | Construction method for cantilever beam in alpine region |
| CN114701040A (en) * | 2022-04-29 | 2022-07-05 | 保利长大工程有限公司 | double-T-shaped precast beam plate mould production process |
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| GB1147434A (en) * | 1965-04-07 | 1969-04-02 | Tech Inc Const | Method and apparatus for forming concrete bodies |
| CN203256591U (en) * | 2013-04-12 | 2013-10-30 | 同济大学 | U-type beam structure and bottom plate pre-stress tendon structure thereof |
| CN104631302A (en) * | 2015-02-13 | 2015-05-20 | 济南轨道交通集团有限公司 | Perforated thin-wall precast channel beam for rail transit and precast method of perforated thin-wall precast channel beam for rail transit |
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2016
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| GB1147434A (en) * | 1965-04-07 | 1969-04-02 | Tech Inc Const | Method and apparatus for forming concrete bodies |
| CN203256591U (en) * | 2013-04-12 | 2013-10-30 | 同济大学 | U-type beam structure and bottom plate pre-stress tendon structure thereof |
| CN104631302A (en) * | 2015-02-13 | 2015-05-20 | 济南轨道交通集团有限公司 | Perforated thin-wall precast channel beam for rail transit and precast method of perforated thin-wall precast channel beam for rail transit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109291208A (en) * | 2018-10-29 | 2019-02-01 | 马鞍山钢铁建设集团有限公司 | A kind of large-span prestressed concrete T plate construction method |
| CN109291208B (en) * | 2018-10-29 | 2023-10-13 | 马鞍山钢铁建设集团有限公司 | Large-span prestressed concrete double-T-plate construction method |
| CN114657898A (en) * | 2022-02-19 | 2022-06-24 | 中铁二十局集团第六工程有限公司 | Construction method for cantilever beam in alpine region |
| CN114458018A (en) * | 2022-02-25 | 2022-05-10 | 中国华西企业股份有限公司 | Prestress construction method |
| CN114701040A (en) * | 2022-04-29 | 2022-07-05 | 保利长大工程有限公司 | double-T-shaped precast beam plate mould production process |
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Application publication date: 20170503 |