CN109537917A - A kind of device for pre-positioning and prefabricated vertical PC member reinforcing steel bar sleeve are pre-positioned method - Google Patents
A kind of device for pre-positioning and prefabricated vertical PC member reinforcing steel bar sleeve are pre-positioned method Download PDFInfo
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- CN109537917A CN109537917A CN201811237774.0A CN201811237774A CN109537917A CN 109537917 A CN109537917 A CN 109537917A CN 201811237774 A CN201811237774 A CN 201811237774A CN 109537917 A CN109537917 A CN 109537917A
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- assembly
- positioning
- sleeve
- locating rod
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Classifications
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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
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/18—Adjusting tools; Templates
- E04G21/1841—Means for positioning building parts or elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
- E04C5/165—Coaxial connection by means of sleeves
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a kind of device for pre-positioning and prefabricated vertical PC member reinforcing steel bar sleeve to be pre-positioned method, is related to prefabricated components mounting technology field；Wherein, a kind of device for pre-positioning, including sub-assembly, the sub-assembly lower end are equipped with locating rod, are additionally provided with locking structure on the sub-assembly；Locking rod is vertically and fixedly provided in the locating rod, the locking structure is combination slot, and the combination slot includes vertical slot and transverse groove；The sub-assembly includes main structure body, flexible connector and elastic parts, and the elastic parts includes T-type connector, is provided with elastic compression part between the T-type connector and movable trench bottom.A kind of prefabricated vertical PC member reinforcing steel bar sleeve pre-determined bit method, utilizes above-mentioned device for pre-positioning to carry out the pre-determined bit of reinforced bar sleeve.The present invention provides structures simply, cost is relatively low, service life is longer, operation is convenient, and helps to improve construction efficiency and a kind of device for pre-positioning of safety and prefabricated vertical PC member reinforcing steel bar sleeve pre-determined bit method.
Description
Technical field
The present invention relates to prefabricated components mounting technology fields, specifically, it is related to a kind of device for pre-positioning and prefabricated perpendicular
Method is pre-positioned to PC member reinforcing steel bar sleeve.
Background technique
As country eliminates the backward production facilities and the transition and upgrade of construction industry, assembled architecture are increasingly becoming the mainstream of construction industry
Structure type.Prefabricated PC component makes in factory and transports to scene, and the grouting of junction sleeve is installed and carried out at scene,
To form whole stabilising system.
For the case of prefabricated vertical PC component, internal pour respectively on prefabricated components is saved up and down and is fixed with sleeve and steel
Muscle；When carrying out the installation of section prefabricated components up and down, scene needs to be accurately positioned the connection of sleeve and reinforcing bar, just can guarantee component
Smoothly installation；Especially for Large Precast Members, reinforced bar sleeve quantity is more, and when installation needs construction personnel to carry out throwing oneself on the ground to observe
And lifting and positioning are guided, not only construction efficiency is extremely low, but also there are biggish security risks.
Summary of the invention
In view of the above technical problems, the first technical purpose of the invention is to provide a kind of device for pre-positioning, using in concentric
The sub-assembly and locating piece of setting, realize the pre-determined bit of reinforced bar sleeve, while improving construction efficiency, ensure site operation
Safety.
To realize above-mentioned first technical purpose, the present invention provides the following technical scheme that
A kind of device for pre-positioning, including sub-assembly, upper end and the sleeve of the sub-assembly are fixed；The sub-assembly lower end is also up and down
It is movably set with locating piece, the sub-assembly is overlapped with the center line of locating piece and its center line is parallel to the height side of sub-assembly
To；The locking structure for locking locating piece is additionally provided on the sub-assembly.
By using above-mentioned technical proposal, in practical operation, sub-assembly upper end is fixed on section prefabricated components bottom
In sleeve；When locating piece is not in lock state, locating piece can flexibly be gone up and down in the assembly.With upper section prefabricated components
It being hung under constantly, staff can artificially observe the locating piece on sub-assembly, since sub-assembly is overlapped with the center line of locating piece, when
When locating piece abuts with the reinforcing bar at the top of lower section prefabricated components and keeps coaxial, also this means that the set of upper section prefabricated components bottom
Cylinder has been targeted by the reinforcing bar on corresponding lower section prefabricated components.After locating piece cancels lock state, staff makes a reservation for this
Position device is removed from sleeve, and upper section prefabricated components are slowly transferred, and the reinforcing bar in lower section prefabricated components can be properly inserted correspondence
Sleeve.In this way, the pre-determined bit for realizing reinforcing bar and sleeve is thrown oneself on the ground to observe and be guided without staff, and construction is just
Victory significantly improves, so that construction efficiency not only be greatly improved, but also can also improve the safety of construction.
The present invention is further arranged to: the locating piece is locating rod, center line activity of the locating rod along sub-assembly
It is inserted in sub-assembly lower end.
By using above-mentioned technical proposal, when locating rod is detached from lock state, locating rod can be along the center line of sub-assembly
It is flexibly flexible, while guaranteeing that locating rod can contact steel bar end and be accurately aimed at reinforcing bar, it is ensured that device for pre-positioning can
Easily taken out between upper and lower section prefabricated components.
The present invention is further arranged to: being vertically and fixedly provided with locking rod in the locating rod；The locking structure is to be opened in
Combination slot on sub-assembly lateral wall and for wearing locking rod, the combination slot includes vertical slot, the length of the vertical slot
It is oriented parallel to the center line of sub-assembly；The vertical slot width direction side also level is provided with and communicated with transverse groove.
By using above-mentioned technical proposal, when locking rod is arranged in vertical slot, locating rod is in unlocked state, this
When locating rod can flexibly stretch along the center line of sub-assembly；When locking rod slides into transverse groove, locating rod is in the lock state, this
When locating rod can not continue to stretch in the assembly.
The present invention is further arranged to: the sub-assembly includes main structure body, flexible connector and for connection structure
The elastic parts of main body and flexible connector, the flexible connector are embedded in sleeve and are formed with sleeve and be interference fitted.
By using above-mentioned technical proposal, flexible connector clamping is set in sleeve, is guaranteeing the same of mounting stability
When, it is ensured that sub-assembly integrally can be removed easily from sleeve；Meanwhile by elastic parts connection structure main body and elasticity
Connector, when the device for pre-positioning is touched with lower square bar, elastic parts can play buffer function, help to extend
The service life of the device for pre-positioning.
The present invention is further arranged to: the direction inside the main structure body along its center line forms loose slot；It is described
Elastic parts includes T-type connector, and the small end of the T-type connector is connected with flexible connector, the big end of the T-type connector
Activity is embedded in loose slot；It is pushed against between the big end of the T-type connector and movable trench bottom and is provided with elastic compression part.
By using above-mentioned technical proposal, in actual use, the big end of T-type connector can be pushed against by elastic compression part
The top of loose slot guarantees sub-assembly overall stability；When locating rod and lower square bar are touched, flexible connector can
Continue to push elastic compression part by T-type connector, so elastic compression part can play effective buffer function.
The present invention is further arranged to: the small end and flexible connector of the T-type connector are in be detachably fixed setting.
By using above-mentioned technical proposal, since in the frequent disassembly process of device for pre-positioning, flexible connector can not be kept away
Exempt to be damaged, flexible connector and T-type connector are arranged to dismountable structure type, are convenient for changing elastic connection
Head avoids entirety from scrapping the device for pre-positioning.
The present invention is further arranged to: the flexible connector forms chamfering at main structure body one side edge.
By using above-mentioned technical proposal, chamfering can facilitate flexible connector to be embedded in sleeve, improve the convenience of construction.
In view of the above technical problems, the second technical purpose of the invention is to provide a kind of prefabricated vertical PC member reinforcing steel bar sleeve
Pre-determined bit method realizes the pre-determined bit of reinforced bar sleeve using above-mentioned device for pre-positioning, improves construction efficiency and working security.
To realize above-mentioned second technical purpose, the present invention provides the following technical scheme that
A kind of prefabricated vertical PC member reinforcing steel bar sleeve pre-determined bit method, comprising the following steps:
S1, adjusting locating rod to lock state, and sub-assembly upper end is fixed in corresponding sleeve；
S2, start to lift section prefabricated components, and locating rod lower end is made to move closer to correspond to reinforcing bar on lower section prefabricated components
End；
Prefabricated components are saved on S3, fine tuning, until locating rod and corresponding reinforcing bar are coaxial；
S4, the locking for releasing locating rod, remove device for pre-positioning from sleeve.
By using above-mentioned technical proposal, sub-assembly and the sleeve on upper section prefabricated components are concentric, when locating rod and lower section
When reinforcing bar on prefabricated components is coaxial, also this means that the sleeve on upper section prefabricated components is directed at the steel on lower section prefabricated components
Muscle improves construction efficiency and safety to realize pre-determined bit.
The present invention is further arranged to: in step sl, the device for pre-positioning is at least on upper section prefabricated components bottom both sides
One group is respectively arranged at angle.
By using above-mentioned technical proposal, by the way that at least two device for pre-positioning are arranged, it is ensured that above save prefabricated components bottom
At least there are two the reinforcing bars on the lower section prefabricated components of sleeve alignment；The reinforced bar sleeve up and down on section prefabricated components is originally designed as again
Alignment, so the positioning to whole reinforced bar sleeves between the two is realized in this way namely indirectly, to further mention
High construction efficiency.
In conclusion the invention has the following advantages:
1, while being held in position part stability using locking structure, guarantee that sleeve can be accurately aimed at indirectly by sub-assembly
Reinforcing bar below realizes the pre-determined bit to reinforcing bar and sleeve during upper section prefabricated part hanging, is not necessarily to site operation people
Member throws oneself on the ground to observe and guide, and not only greatly improves construction efficiency, but also greatly improve the safety of construction；
2, the locking rod for comprehensively utilizing locating rod and being perpendicularly fixed in locating rod cooperates combination slot, pre- meeting reinforced bar sleeve
While positioning operation demand, it is ensured that the device for pre-positioning can be realized convenient dismounting, and the convenience of operation is greatly improved；
3, using flexible connector and elastic parts, impact brought by collision when can buffer lifting helps to extend this pre-
The service life of positioning device.
Detailed description of the invention
Fig. 1 is primarily used for embodying the structural schematic diagram of the device for pre-positioning application method；
Fig. 2 is that embodiment one is mainly used for embodying the integrally-built axonometric schematic diagram of the device for pre-positioning in the present invention；
Fig. 3 is that embodiment one is mainly used for embodying the half-section diagram of the device for pre-positioning internal structure in the present invention；
Embodiment two is mainly used for embodying the flow diagram of reinforced bar sleeve pre-determined bit method in Fig. 4 present invention.
Appended drawing reference: 1, upper section prefabricated components；2, lower section prefabricated components；3, device for pre-positioning；31, locating rod；311, it locks
Only bar；32, main structure body；321, telescopic chute；322, loose slot；33, combination slot；331, vertical slot；332, transverse groove；34, bullet
Property connector；341, chamfering；35, elastic parts；351, T-type connector；352, elastic compression part.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is described in detail.
Embodiment one:
Referring to attached drawing 1-2, a kind of device for pre-positioning is mainly used for the pre-determined bit of prefabricated vertical PC member reinforcing steel bar sleeve comprising
Sub-assembly and the locating piece for being set to sub-assembly lower end, sub-assembly and locating piece integrally can be set to cylindrical-shaped structure；Locating piece
It is overlapped with the holding of sub-assembly center line, locating piece can be up and down along sub-assembly, and is additionally provided on sub-assembly for locking positioning
The locking structure of part.
When carrying out the lifting of upper section prefabricated components 1, which at least sets in the bottom of upper section prefabricated components 1
Have two groups, and wherein preferably two groups be respectively arranged at 1 bottom of section prefabricated components, two edge, this two groups of device for pre-positioning 3 divide
Not Dui Ying on save 1 bottom edge of prefabricated components two sleeves.When starting installation, sub-assembly is arranged in section prefabricated components 1
In the sleeve of bottom, and the upper end and sleeve are formed and are interference fitted, and sub-assembly upper end is enabled to be fixed on corresponding sleeve
In, and retention assembly is integrally overlapped with sleeve centerline；As upper section prefabricated components 1 are gradually transferred, locating piece is eventually touched
Encounter the end of lower 2 top rebars of section prefabricated components, the artificial locating piece that adjusts is aligned reinforcing bar；At this point, sleeve and sub-assembly axis
It is overlapped, sub-assembly is overlapped with locating piece center line, and locating piece is aligned with reinforcing bar holding, therefore sleeve is realized with reinforcing bar and made a reservation for
Position.
Referring to attached drawing 2-3, above-mentioned locating piece is locating rod 31, and locating rod 31 is round bar, and its material can be iron or modeling
Material；Also integrally formed with locking rod 311 in locating rod 31, locking rod 311 is vertical setting with 31 main part of locating rod.
Above stated assembly includes that main structure body 32, the cylindrical structure of main structure body 32, and its material can be iron or modeling
Material；Telescopic chute 321 is arranged in 32 lower end of main structure body, and telescopic chute 321 is since 32 lower end surface of main structure body and along structure master
The axis of body 32 extends one end distance to the upper end；Above-mentioned 31 activity of locating rod is inserted in telescopic chute 321, so that positioning
Bar 31 can stretch above and below 32 lower end of main structure body.Meanwhile 32 lower end of main structure body is also provided with for wearing
The combination slot 33 of locking rod 311, combination slot 33 include the vertical slot 331 and transverse groove 332 in connection setting；331 edge of vertical slot
The radial direction of main structure body 32 is opened up to telescopic chute 321, and transverse groove 332 is located near 331 middle section of vertical slot, is extended
Direction is vertical with vertical slot 331, and transverse groove 332 equally extends radially at telescopic chute 321 along main structure body 32.It is above-mentioned fixed
Position bar 31 is inserted in telescopic chute 321, and when locking rod 311 is arranged in vertical slot 331, locating rod 31 can vertically slot 331
Lifting；After locking rod 311 is dialled in transverse groove 332, locking rod 311 cooperates transverse groove 332 that will play locking to locating rod 31
Effect, locating rod 31 will be unable to continue to stretch in main structure body 32.Combination slot 33 is constituted for cooperating the locking of locking rod 311 fixed
The locking structure of position bar 31.
Referring to attached drawing 2, sub-assembly further includes the flexible connector 34 for being set to 32 upper end of main structure body, flexible connector 34
Elastic material can be selected to be made, and flexible connector 34 forms chamfering 341 at the one side edge of main structure body 32, side
Just construction personnel will be in the sleeve that save 1 bottom of prefabricated components in the insertion of flexible connector 34.Meanwhile sub-assembly further includes for connecting
Connect the elastic parts 35 of main structure body 32 and flexible connector 34.
In conjunction with attached drawing 3,32 top of main structure body is also provided with loose slot 322 along its axis, and loose slot 322 is in main structure body
It is in up-small and down-big structure type on 32 direction from top to bottom, and runs through the upper surface of main structure body 32 on the upside of loose slot 322.
Elastic parts 35 includes T-type connector 351, and T-type connector 351 can be plastic material, and T-type connector 351
The T-shaped structure of split；The big end of T-type connector 351 is embedded in loose slot 322, and can be glided on loose slot 322
It is dynamic；It is also pushed against between 322 bottom of 351 big end of T-type connector and loose slot and is provided with elastic compression part 352, the elastic compression part
352 can be compressed spring or compressing rubber.The lower end of T-type connector 351 is pierced by through loose slot 322, and even with above-mentioned elasticity
Connector 34 is threadedly coupled, and is connect so that T-type connector 351 is detachably fixed with the formation of above-mentioned flexible connector 34.
The working principle of the present embodiment is: before carrying out upper section prefabricated components 1 and lifting, first in upper 1 bottom of section prefabricated components
It is inserted into one group of device for pre-positioning 3 respectively in two sleeves of two edges, so that flexible connector 34 is fixed on corresponding set
In cylinder, and sleeve is kept to be overlapped with 32 axis of main structure body.After starting lifting, as upper section prefabricated components 1 are gradually reduced, when
After locating rod 31 touches the reinforcing bar at lower 2 top of section prefabricated components, hung under pause, it is artificial to adjust locating rod 31, so that locating rod
31 are overlapped with the center line of reinforcing bar.Then, locking rod 311 is transferred to from transverse groove 332, and will be whole after shrinking locating rod 31
A device for pre-positioning 3 is removed from sleeve, then slowly under put section prefabricated components 1, reinforcing bar is directed at corresponding sleeve simultaneously will be quasi-
Really it is inserted into corresponding sleeve.In this way, it is realized in upper 1 hoisting process of section prefabricated components and reinforcing bar and sleeve is made a reservation for
Position is thrown oneself on the ground to observe and be guided, not only greatly improves construction efficiency, but also greatly improve construction without site operation personnel
Safety.
Embodiment two:
Referring to attached drawing 1 and attached drawing 4, a kind of prefabricated vertical PC member reinforcing steel bar sleeve pre-determined bit method, comprising the following steps:
S1, adjusting locating rod 31 to lock state, and sub-assembly upper end is fixed in corresponding sleeve.
It can be aligned for section prefabricated components 1 in guarantee with reinforced bar sleeves whole on lower section prefabricated components 2, it is at least pre- in upper section
Two groups of device for pre-positioning 3 are arranged in 1 bottom of component processed；Preferably, in the sleeve of upper 1 bottom of section prefabricated components, two edge respectively
One group of device for pre-positioning 3 is set.Meanwhile when installing device for pre-positioning 3 into sleeve, it should ensure that in sleeve and main structure body 32
Heart line keeps being overlapped.
S2, start to lift section prefabricated components 1, and it is right on lower section prefabricated components 2 that 31 lower end of locating rod is moved closer to
Answer the end of reinforcing bar.
In practical operation, the speed that upper section prefabricated components 1 decline can first quick and back slow, so that 31 lower end of locating rod is first
Then fast approaching reinforcing bar slowly touches reinforcing bar, prevent locating rod 31 and reinforcing bar from sharp impacts occur, avoid damaging the pre-determined bit
Device 3.
Prefabricated components 1 are saved on S3, fine tuning, until locating rod 31 and corresponding reinforcing bar are coaxial.
In practical operation, compared to traditional reinforced bar sleeve positioning method, which throws oneself on the ground to operate without construction personnel, applies
Work efficiency rate and safety are obviously improved.
S4, the locking for releasing locating rod 31, remove device for pre-positioning 3 from sleeve.
Complete device for pre-positioning 3 disassembly after, construction personnel can slowly under hang on section prefabricated components 1 so that lower section is prefabricated
Each reinforcing bar at 2 top of component is slowly inserted into corresponding sleeve, greatly improves the convenience that section prefabricated components 2 assemble up and down.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (9)
1. a kind of device for pre-positioning, which is characterized in that including sub-assembly, upper end and the sleeve of the sub-assembly are fixed；Described group
Component lower end is also up and down to be provided with locating piece, and the sub-assembly is overlapped with the center line of locating piece and its center line is parallel to
The short transverse of sub-assembly；The locking structure for locking locating piece is additionally provided on the sub-assembly.
2. a kind of device for pre-positioning according to claim 1, which is characterized in that the locating piece is locating rod (31), institute
The center line activity that locating rod (31) is stated along sub-assembly is inserted in sub-assembly lower end.
3. a kind of device for pre-positioning according to claim 2, which is characterized in that be vertically and fixedly provided on the locating rod (31)
Locking rod (311)；The locking structure is the combination slot for being opened on sub-assembly lateral wall and being used to wear locking rod (311)
(33), the combination slot (33) includes vertical slot (331), and the length direction of the vertical slot (331) is parallel in sub-assembly
Heart line；Vertical slot (331) the width direction side also level is provided with and communicated with transverse groove (332).
4. a kind of device for pre-positioning according to claim 1, which is characterized in that the sub-assembly includes main structure body
(32), flexible connector (34) and the elastic parts (35) for connection structure main body (32) and flexible connector (34), institute
Flexible connector (34) is stated to be embedded in sleeve and form interference fit with sleeve.
5. a kind of device for pre-positioning according to claim 4, which is characterized in that the main structure body (32) is internal along wherein
The direction of heart line forms loose slot (322)；The elastic parts (35) includes T-type connector (351), the T-type connector
(351) small end is connected with flexible connector (34), and the big end activity of the T-type connector (351) is embedded at loose slot (322)
In；It is pushed against between the big end and loose slot (322) bottom of the T-type connector (351) and is provided with elastic compression part (352).
6. a kind of device for pre-positioning according to claim 5, which is characterized in that the small end of the T-type connector (351) with
Flexible connector (34) is in be detachably fixed setting.
7. a kind of device for pre-positioning according to claim 4 or 6, which is characterized in that the flexible connector (34) is deviated from
Chamfering (341) are formed at main structure body (32) one side edge.
8. a kind of prefabricated vertical PC member reinforcing steel bar sleeve is pre-positioned method, which comprises the following steps:
S1, adjusting locating rod (31) to lock state, and sub-assembly upper end is fixed in corresponding sleeve；
S2, start to lift section prefabricated components (1), and locating rod (31) lower end is moved closer on lower section prefabricated components (2)
The end of corresponding reinforcing bar；
Prefabricated components (1) is saved on S3, fine tuning, until locating rod (31) and corresponding reinforcing bar are coaxial；
S4, the locking for releasing locating rod (31), remove device for pre-positioning (3) from sleeve.
9. the prefabricated vertical PC member reinforcing steel bar sleeve of one kind according to claim 8 is pre-positioned method, which is characterized in that in step
In rapid S1, which is at least respectively arranged one group in upper two edge of section prefabricated components (1) bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811237774.0A CN109537917B (en) | 2018-10-23 | 2018-10-23 | Pre-positioning device and pre-positioning method for prefabricated vertical PC component steel bar sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811237774.0A CN109537917B (en) | 2018-10-23 | 2018-10-23 | Pre-positioning device and pre-positioning method for prefabricated vertical PC component steel bar sleeve |
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| Publication Number | Publication Date |
|---|---|
| CN109537917A true CN109537917A (en) | 2019-03-29 |
| CN109537917B CN109537917B (en) | 2020-10-09 |
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|---|---|---|---|
| CN201811237774.0A Active CN109537917B (en) | 2018-10-23 | 2018-10-23 | Pre-positioning device and pre-positioning method for prefabricated vertical PC component steel bar sleeve |
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| CN113846855A (en) * | 2021-10-14 | 2021-12-28 | 上海建工集团股份有限公司 | Prefabricated component hoists connecting piece of taking one's place fast |
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| CN110387825B (en) * | 2019-07-17 | 2021-10-19 | 中铁二十四局集团有限公司 | Construction method for quickly adjusting holes and postures of prefabricated stand columns |
| CN110607914A (en) * | 2019-10-22 | 2019-12-24 | 南通四建集团有限公司 | Vertical prefabricated component positioner of assembled building concrete |
| CN110607914B (en) * | 2019-10-22 | 2024-03-26 | 南通四建集团有限公司 | Positioning device for vertical prefabricated part of assembled building concrete |
| CN113846855A (en) * | 2021-10-14 | 2021-12-28 | 上海建工集团股份有限公司 | Prefabricated component hoists connecting piece of taking one's place fast |
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| CN109537917B (en) | 2020-10-09 |
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