CN110499857A - A kind of precast concrete superimposed sheet vertically goes out the installation method of muscle and readjustment - Google Patents
A kind of precast concrete superimposed sheet vertically goes out the installation method of muscle and readjustment Download PDFInfo
- Publication number
- CN110499857A CN110499857A CN201910923599.9A CN201910923599A CN110499857A CN 110499857 A CN110499857 A CN 110499857A CN 201910923599 A CN201910923599 A CN 201910923599A CN 110499857 A CN110499857 A CN 110499857A
- Authority
- CN
- China
- Prior art keywords
- muscle
- superimposed sheet
- beard
- beard muscle
- readjustment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 210000003205 muscle Anatomy 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000009434 installation Methods 0.000 title claims abstract description 25
- 239000011178 precast concrete Substances 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 239000004567 concrete Substances 0.000 claims abstract description 23
- 238000010276 construction Methods 0.000 claims abstract description 21
- 230000002787 reinforcement Effects 0.000 claims abstract description 11
- 239000006260 foam Substances 0.000 claims abstract description 10
- 239000003292 glue Substances 0.000 claims abstract description 10
- 238000012423 maintenance Methods 0.000 claims abstract description 7
- 238000007796 conventional method Methods 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims description 24
- 230000003014 reinforcing effect Effects 0.000 claims description 21
- 238000005266 casting Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000003447 ipsilateral effect Effects 0.000 claims description 3
- 239000011120 plywood Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 210000000988 bone and bone Anatomy 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
-
- 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
Abstract
The present invention relates to the installation methods that a kind of precast concrete superimposed sheet vertically goes out muscle and readjustment, and installation method is the following steps are included: the beard muscle for overlapping board ends is bent upwards 90 degree by (1)；(2) beam forms and plank sheathing are arranged, foam glue strip is set in the plank sheathing upper surface at the beam forming cavity accent edge of beam forms；(3) beam forming cavity places steel reinforcement cage, and beam steel is bound in advance by traditional method, and the superimposed sheet scene of transporting is carried out vertical lifting placement；(4) the beard muscle for overlapping board ends is bent downward and reverts to horizontality；(5) pouring for concrete, maintenance a period of time are then carried out according to a conventional method.Realize the Fast Installation of superimposed sheet, it avoids the roof beam of superimposed sheet beard muscle and Vierendeel girder from indulging muscle and generates collision, accelerate construction efficiency, reduce labor workload, simultaneously without tilting installation, in superimposed sheet hoisting process, superimposed sheet and foam glue strip CONTACT WITH FRICTION are avoided, prevents that spillage occurs when beam and superimposed sheet concreting.
Description
Technical field
The present invention relates to the installation methods that a kind of precast concrete superimposed sheet vertically goes out muscle and readjustment.
Background technique
Assembly concrete building is referred in body structure portion or is all assembled using precast concrete
Reinforced concrete structure building.In order to guarantee that the holistic resistant behavior of precast reinforced concrete structure is equal with whole structure of pouring,
It needs to take corresponding reliable construction measure and construction method, pre-erection, cast-in-place part, node in guarantee fabricated construction
Etc. can cooperate, and ensure that its stress performance pours structure at or above whole.
Currently, beam column uses cast-in-place construction, plate is also one of common form of construction work now using prefabricated superimposed sheet, still
Prefabricated superimposed sheet and beams of concrete are used in floor when cast-in-place concrete beam width is larger, to need to use in cast-in-place system
When four limbs stirrup, there are collision problems for back longitudinal reinforcement and superimposed sheet overhanging " beard muscle ".Frame joist steel is used in construction
Muscle first binds, binds after secondary beam steel, therefore in superimposed sheet hoisting process, overhanging " beard muscle " meeting of superimposed sheet wherein one end
With longitudinal reinforcement " fighting " at the top of Vierendeel girder.When traditional method is superimposed sheet lifting in the inclined insertion beam of beard muscle, often fold
" foam glue strip " on plywood meeting friction destruction beam side, so that later period beam slab junction spillage.
Summary of the invention
In view of the deficiencies in the prior art, technical problem to be solved by the invention is to provide a kind of precast concrete superimposed sheets
The vertical installation method of muscle and readjustment out.
In order to solve the above-mentioned technical problem, the technical scheme is that a kind of precast concrete superimposed sheet vertically goes out muscle
And the installation method of readjustment, the installation method is the following steps are included: the beard muscle for overlapping board ends is bent upwards 90 by (1)
Degree；(2) beam forms and plank sheathing are arranged, foamed glue is set in the plank sheathing upper surface at the beam forming cavity accent edge of beam forms
Item；(3) beam forming cavity places steel reinforcement cage, and beam steel is bound in advance by traditional method, the superimposed sheet scene of transporting is carried out vertical
Lifting is placed；(4) the beard muscle for overlapping board ends is bent downward and reverts to horizontality；(5) it then carries out according to a conventional method
Concrete pours, maintenance a period of time.
Preferably, in step (1), when element precast field makes superimposed sheet, the reinforcing bar process of binding inside superimposed sheet
In the beard muscle of board ends is bent upwards 90 degree in advance, and in the superimposed sheet lower inside of beard muscle root binding one article the
One longitudinal reinforcement is used to undertake actuating pressure when construction in later period scene beard muscle is bent downwardly to concrete, in beard muscle root
Superimposed sheet inner upper bind second longitudinal direction reinforcing bar for undertaking when construction in later period scene beard muscle is bent downwardly to mixed
The effect top power for coagulating soil, is then poured, maintenance component appropriate.
Preferably, beam forms includes vertical supporting frame, and vertical supporting top of the trellis is provided with keel, is provided with wood at the top of keel
Brick, woodbox top are provided with the beam forming cavity to lacing wire；Plank sheathing bottom is provided with keel, and the cohesive end of plank sheathing is equal
It is flushed with the beam forming cavity accent edge of ipsilateral beam forms.
Preferably, it in step (2), first arranges the vertical supporting frame of beam forms, dragon is then installed on vertical supporting frame
Bone, and two pieces of rectangle woodboxs are arranged to guarantee that load uniformly transfers on beam bottom keel, so in beam forming cavity bottom template
It is arranged afterwards in beam forming cavity both sides side template and lacing wire is carried out by rectangle woodbox to drawing, template when resisting casting concrete
Lateral pressure, the deformation of beam when preventing casting concrete, the finally table on the plank sheathing at the beam forming cavity accent edge of beam forms
Foam glue strip is arranged in face.
Preferably, in step (4), beard muscle is bent downward before reverting to horizontality, is needed beam steel cage office
Portion lifts, and is passed through below bearing rod using rectangular wooden unit, and rectangular wooden unit is supported on superimposed sheet upper surface, steel reinforcement cage is provoked.
Preferably, in step (4), beard muscle is bent using reinforcing bar bending auxiliary tool, reinforcing bar bends auxiliary tool packet
Include steel bar, one end of steel bar be installed with it is arc-shaped turn portion, the side for turning portion is installed with two pieces of steel billets, two pieces of steel billets it
Between form bayonet to card beard muscle, two pieces of steel billets are each perpendicular to steel bar and turn plane where portion；By beard muscle when use
It is stuck on bayonet, pulls steel bar down and bend downward beard muscle and revert to horizontality.
Preferably, if being intended to further strengthen the protection to concrete local around beard muscle, two reinforcing bars can be used
Bending auxiliary tool is simultaneously bent a beard muscle, i.e. the bending point that a tool blocks beard muscle is motionless, another
Tool carries out bending operation in beard muscle end, and since tool is seized bending point, the beard muscle after bending point would not occur
Deformation, and then avoid the extruding to concrete.
Preferably, beard muscle is bent downward revert to horizontality after, rectangular wooden unit is extracted out, rectangular wooden unit is repeatable
It is finished using the beard muscle horizontal curvature until entire superimposed sheet one end.
Preferably, steel reinforcement cage further includes that beam indulges muscle and beam stirrup.
Compared with prior art, the invention has the following advantages: realizing the Fast Installation of superimposed sheet, superimposed sheet is avoided
The roof beam of beard muscle and Vierendeel girder indulges muscle and generates collision, accelerates construction efficiency, reduces labor workload, while without tilting peace
Dress, in superimposed sheet hoisting process, avoids superimposed sheet and foam glue strip CONTACT WITH FRICTION, when preventing beam and superimposed sheet concreting
Spillage occurs.
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
Detailed description of the invention
Fig. 1 is the superimposed sheet organigram one of the embodiment of the present invention.
Fig. 2 is the superimposed sheet organigram two of the embodiment of the present invention.
Fig. 3 is the Construction State schematic diagram one of the embodiment of the present invention.
Fig. 4 is the Construction State schematic diagram two of the embodiment of the present invention.
Fig. 5 is the Construction State schematic diagram three of the embodiment of the present invention.
Fig. 6 is the Construction State schematic diagram four of the embodiment of the present invention.
Fig. 7 is the organigram that reinforcing bar bends auxiliary tool.
Fig. 8 is the usage state diagram that reinforcing bar bends auxiliary tool.
Fig. 9 is the Construction State schematic diagram five of the embodiment of the present invention.
Figure 10 is the Construction State schematic diagram six of the embodiment of the present invention.
Figure 11 is the perspective view of Figure 10.
Specific embodiment
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and cooperate attached drawing, make detailed
Carefully it is described as follows.
As shown in Fig. 1 ~ 11, a kind of precast concrete superimposed sheet vertically goes out the installation method of muscle and readjustment, the installation
Method is the following steps are included: the beard muscle 2 at 1 both ends of superimposed sheet is bent upwards 90 degree by (1)；(2) beam forms 3 and plank sheathing are arranged
4, in the plank sheathing upper surface at the 5 accent edge of beam forming cavity of beam forms, foam glue strip 6 is set；(3) beam forming cavity places reinforcing bar
Cage, beam steel are bound in advance by traditional method, the superimposed sheet scene of transporting are carried out vertical lifting placement, since beard muscle is prior
Bending need not tilt installation when placing superimposed sheet, prevent friction from steeping even the problem so four limbs hoop will not collide
Foam adhesive tape；(4) the beard muscle for overlapping board ends is bent downward and reverts to horizontality；(5) it is then mixed according to a conventional method
Solidifying soil pours, maintenance a period of time.
In embodiments of the present invention, in step (1), when element precast field makes superimposed sheet, the steel inside superimposed sheet
The beard muscle of board ends is bent upwards 90 degree, and the superimposed sheet lower inside in beard muscle root in advance in muscle process of binding
A first longitudinal direction reinforcing bar 7 is bound to be used to undertake actuating pressure when construction in later period scene beard muscle is bent downwardly to concrete,
Superimposed sheet inner upper in beard muscle root bind second longitudinal direction reinforcing bar 8 for undertake construction in later period scene beard muscle to
It to the effect top power of concrete when lower bending, is then poured, maintenance component appropriate；First longitudinal direction reinforcing bar and second longitudinal direction
Reinforcing bar is avoided that the damage that construction site superimposed sheet overhanging " beard muscle " is in the process of bending formed concrete slab.
In embodiments of the present invention, beam forms includes vertical supporting frame 9, and vertical supporting top of the trellis is provided with keel 10, dragon
It is provided with woodbox 11 at the top of bone, is provided at the top of woodbox with the beam forming cavity to lacing wire 12；Plank sheathing bottom is provided with dragon
Bone, the cohesive end of plank sheathing are flushed with the beam forming cavity accent edge of ipsilateral beam forms.
In embodiments of the present invention, in step (2), the vertical supporting frame of beam forms is first arranged, then in vertical supporting
Keel are installed on frame, and arrange two pieces of rectangle woodboxs in beam forming cavity bottom template to guarantee that load is uniformly transferred in beam bottom
On keel, then it is arranged in beam forming cavity both sides side template and lacing wire is carried out by rectangle woodbox to drawing, resistance pours coagulation
The lateral pressure of template when native, the deformation of beam when preventing casting concrete, finally at the beam forming cavity accent edge of beam forms
Foam glue strip is arranged in plank sheathing upper surface.
In embodiments of the present invention, in step (4), beard muscle is bent downward before reverting to horizontality, need by
Beam steel cage locally lifts, and is passed through below bearing rod using rectangular wooden unit 13, rectangular wooden unit is supported on superimposed sheet upper surface, by steel
Muscle cage is provoked.
In embodiments of the present invention, in step (4), beard muscle, reinforcing bar bending are bent using reinforcing bar bending auxiliary tool
Auxiliary tool includes steel bar 14, one end of steel bar be installed with it is arc-shaped turn portion 15, the side for turning portion is installed with two blocks of small steel
Block 16, forms the bayonet to card beard muscle between two pieces of steel billets, and two pieces of steel billets are each perpendicular to steel bar and turn flat where portion
Face；Beard muscle is stuck on bayonet when use, steel bar is pulled down and bends downward beard muscle and revert to horizontality.
In embodiments of the present invention, if being intended to further strengthen the protection to concrete local around beard muscle, can make
A beard muscle is bent simultaneously with two reinforcing bar bending auxiliary tools, i.e., a tool blocks the bending point of beard muscle not
Dynamic, another tool carries out bending operation in beard muscle end, and since tool is seized bending point, the beard muscle after bending point is just
It will not deform, and then avoid the extruding to concrete.
In embodiments of the present invention, beard muscle is bent downward revert to horizontality after, rectangular wooden unit is extracted out, it is rectangular
Wooden unit is reusable until the beard muscle horizontal curvature of entire superimposed sheet one end finishes.
In embodiments of the present invention, steel reinforcement cage further includes that beam indulges muscle 17 and beam stirrup 18.
The present invention is not limited to above-mentioned preferred forms, anyone can show that other are each under the inspiration of the present invention
The precast concrete superimposed sheet of kind form vertically goes out the installation method of muscle and readjustment.It is all to be done according to scope of the present invention patent
Equivalent changes and modifications are all covered by the present invention.
Claims (9)
1. the installation method that a kind of precast concrete superimposed sheet vertically goes out muscle and readjustment, it is characterised in that: the installation method
The following steps are included: the beard muscle for overlapping board ends is bent upwards 90 degree by (1)；(2) beam forms and plank sheathing are arranged, in beam form
Foam glue strip is arranged in the plank sheathing upper surface at the beam forming cavity accent edge of plate；(3) beam forming cavity places steel reinforcement cage, and beam steel is pressed
Traditional method is bound in advance, and the superimposed sheet scene of transporting is carried out vertical lifting placement；(4) will overlap the beard muscle of board ends to
Lower bending reverts to horizontality；(5) pouring for concrete, maintenance a period of time are then carried out according to a conventional method.
2. the installation method that precast concrete superimposed sheet according to claim 1 vertically goes out muscle and readjustment, it is characterised in that:
In step (1), when element precast field makes superimposed sheet, in advance by board ends in reinforcing bar process of binding inside the superimposed sheet
Beard muscle is bent upwards 90 degree, and binds a first longitudinal direction reinforcing bar for holding in the superimposed sheet lower inside of beard muscle root
Superimposed sheet inner upper to the actuating pressure of concrete when load construction in later period scene beard muscle is bent downwardly, in beard muscle root
Bind a second longitudinal direction reinforcing bar for undertaking effect top power when construction in later period scene beard muscle is bent downwardly to concrete, so
After poured, maintenance component appropriate.
3. the installation method that precast concrete superimposed sheet according to claim 1 vertically goes out muscle and readjustment, it is characterised in that:
Beam forms includes vertical supporting frame, and vertical supporting top of the trellis is provided with keel, and woodbox, setting at the top of woodbox are provided at the top of keel
Have with the beam forming cavity to lacing wire；Plank sheathing bottom is provided with keel, the cohesive end of plank sheathing with ipsilateral beam forms
Beam forming cavity accent edge flushes.
4. the installation method that precast concrete superimposed sheet according to claim 3 vertically goes out muscle and readjustment, it is characterised in that:
In step (2), the vertical supporting frame of beam forms is first arranged, keel are then installed on vertical supporting frame, and form in beam
Bottom of chamber portion template arranges two pieces of rectangle woodboxs to guarantee that load uniformly transfers on beam bottom keel, then on beam forming cavity both sides
Side template setting carries out to drawing lacing wire by rectangle woodbox, and the lateral pressure of template, prevents from pouring when resisting casting concrete
Finally foam glue strip is arranged in the plank sheathing upper surface at the beam forming cavity accent edge of beam forms in the deformation of beam when building concrete.
5. the installation method that precast concrete superimposed sheet according to claim 1 vertically goes out muscle and readjustment, it is characterised in that:
In step (4), beard muscle is bent downward before reverting to horizontality, needs locally to lift beam steel cage, use is rectangular
Wooden unit passes through below bearing rod, and rectangular wooden unit is supported on superimposed sheet upper surface, steel reinforcement cage is provoked.
6. the installation method that precast concrete superimposed sheet according to claim 1 vertically goes out muscle and readjustment, it is characterised in that:
In step (4), beard muscle is bent using reinforcing bar bending auxiliary tool, reinforcing bar bending auxiliary tool includes steel bar, and the one of steel bar
End be installed with it is arc-shaped turn portion, the side for turning portion is installed with two pieces of steel billets, is formed to card recklessly between two pieces of steel billets
The bayonet of sub- muscle, two pieces of steel billets are each perpendicular to steel bar and turn plane where portion；Beard muscle is stuck on bayonet when use, down
It pulls steel bar and bends downward beard muscle and revert to horizontality.
7. the installation method that precast concrete superimposed sheet according to claim 6 vertically goes out muscle and readjustment, it is characterised in that:
If being intended to further strengthen the protection to concrete local around beard muscle, two reinforcing bar bending auxiliary tools can be used simultaneously
A piece beard muscle is bent, i.e. the bending point that a tool blocks beard muscle is motionless, another tool is in beard muscle end
Bending operation is carried out, since tool is seized bending point, the beard muscle after bending point would not deform, and then avoid pair
The extruding of concrete.
8. the installation method that precast concrete superimposed sheet according to claim 5 vertically goes out muscle and readjustment, it is characterised in that:
Beard muscle is bent downward revert to horizontality after, rectangular wooden unit is extracted out, rectangular wooden unit is reusable until entirely folding
The beard muscle horizontal curvature of plywood one end finishes.
9. the installation method that precast concrete superimposed sheet according to claim 1 vertically goes out muscle and readjustment, it is characterised in that:
Steel reinforcement cage further includes that beam indulges muscle and beam stirrup.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910923599.9A CN110499857A (en) | 2019-09-27 | 2019-09-27 | A kind of precast concrete superimposed sheet vertically goes out the installation method of muscle and readjustment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910923599.9A CN110499857A (en) | 2019-09-27 | 2019-09-27 | A kind of precast concrete superimposed sheet vertically goes out the installation method of muscle and readjustment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110499857A true CN110499857A (en) | 2019-11-26 |
Family
ID=68592940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910923599.9A Pending CN110499857A (en) | 2019-09-27 | 2019-09-27 | A kind of precast concrete superimposed sheet vertically goes out the installation method of muscle and readjustment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110499857A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042520A (en) * | 2019-11-28 | 2020-04-21 | 江苏永联精筑建设集团有限公司 | Slurry overflow prevention construction process for prefabricated part |
| CN112982773A (en) * | 2021-02-26 | 2021-06-18 | 重庆中科建筑科技(集团)有限公司 | Construction method of prefabricated reinforced concrete composite slab with extending reinforcing steel bars |
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|---|---|---|---|---|
| JPH08144410A (en) * | 1994-11-25 | 1996-06-04 | Maeda Corp | Floor slab |
| CN203394027U (en) * | 2013-01-05 | 2014-01-15 | 贺育安 | Semi-assembled construction system for frame-shear wall tube structure |
| CN203420486U (en) * | 2013-07-29 | 2014-02-05 | 江苏南通三建集团有限公司 | Plate-type prefabricated concrete structure |
| JP2014109152A (en) * | 2012-12-03 | 2014-06-12 | Taisei Corp | Beam member and floor structure |
| CN205147172U (en) * | 2015-12-07 | 2016-04-13 | 中民筑友有限公司 | Steel bar bending device |
| CN105756252A (en) * | 2015-04-03 | 2016-07-13 | 张波 | Pre-stressed concrete truss composite slab and manufacturing method thereof |
-
2019
- 2019-09-27 CN CN201910923599.9A patent/CN110499857A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08144410A (en) * | 1994-11-25 | 1996-06-04 | Maeda Corp | Floor slab |
| JP2014109152A (en) * | 2012-12-03 | 2014-06-12 | Taisei Corp | Beam member and floor structure |
| CN203394027U (en) * | 2013-01-05 | 2014-01-15 | 贺育安 | Semi-assembled construction system for frame-shear wall tube structure |
| CN203420486U (en) * | 2013-07-29 | 2014-02-05 | 江苏南通三建集团有限公司 | Plate-type prefabricated concrete structure |
| CN105756252A (en) * | 2015-04-03 | 2016-07-13 | 张波 | Pre-stressed concrete truss composite slab and manufacturing method thereof |
| CN205653944U (en) * | 2015-04-03 | 2016-10-19 | 张波 | Prestressed concrete truss superimposed sheet |
| CN205147172U (en) * | 2015-12-07 | 2016-04-13 | 中民筑友有限公司 | Steel bar bending device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042520A (en) * | 2019-11-28 | 2020-04-21 | 江苏永联精筑建设集团有限公司 | Slurry overflow prevention construction process for prefabricated part |
| CN112982773A (en) * | 2021-02-26 | 2021-06-18 | 重庆中科建筑科技(集团)有限公司 | Construction method of prefabricated reinforced concrete composite slab with extending reinforcing steel bars |
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