CN105735466A - Prefabricated wall column one-segment type steel rib connection structure and method - Google Patents
Prefabricated wall column one-segment type steel rib connection structure and method Download PDFInfo
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- CN105735466A CN105735466A CN201610191697.4A CN201610191697A CN105735466A CN 105735466 A CN105735466 A CN 105735466A CN 201610191697 A CN201610191697 A CN 201610191697A CN 105735466 A CN105735466 A CN 105735466A
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- prefabricated wall
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/16—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/16—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material
- E04B1/163—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material with vertical and horizontal slabs, only the vertical slabs being partially cast in situ
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/16—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material
- E04B1/165—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material with elongated load-supporting parts, cast in situ
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- 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)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a prefabricated wall column one-segment type steel rib connection structure and method. The connection structure comprises an upper prefabricated wall column and a lower prefabricated wall column. The upper ends and the lower ends of the prefabricated wall columns are provided with reserved steel ribs in a staggered mode. External threads are arranged on the tops of the reserved steel ribs at the upper end of the corresponding prefabricated wall column and connected with a sleeve in a threaded mode. The sleeves are through in the up-down direction. The lower ends of the sleeves are provided with internal threads used for being connected with the reserved steel ribs in a threaded mode. The sleeve wall at the upper end of each sleeve is provided with a grouting hole. The reserved steel ribs at the lower end of the upper prefabricated wall column are inserted into the sleeve at the upper end of the lower prefabricated wall column. Grout is poured into the sleeves through the grouting holes, and the butt joint portion of the upper prefabricated wall column and the lower fabricated wall column is cast with concrete. Strength and stiffness of connection between the steel ribs are improved. Only one time of connection between the prefabricated wall columns is needed in each layer, namely, between adjacent horizontal structures. Compared with the conventional mode that the prefabricated wall columns in each layer are connected twice, the use amount of sleeves and other steel is effectively reduced, and construction cost is reduced.
Description
Technical field
The present invention relates to building engineering field, particularly relate to a kind of prefabricated wall column one-part form steel bar connecting structure and method.
Background technology
Prefabricated construction system is with prefabricated components for main member, the xoncrete structure through assembling, connect, part being cast-in-place.This xoncrete structure has that build guality is stable, production efficiency high, environmental pollution is little, the wasting of resources is few, be conducive to the advantages such as social sustainable development.But the bar connecting between assembled wallboard is owing to cost is high or construction precision requires high factor, is always up affecting the technical bottleneck that this system is promoted on a large scale.
The precast wall body method of attachment of existing routine is reserved steel plate between floor, prefabricated panel, then bolt is adopted to carry out being mechanically connected or adopt electric welding to connect, precast wall body between adjacent level structure at least needs twice connection construction, not only waste time and energy, corresponding steel plate make large usage quantity, cause high cost.In existing fabricated construction technology, pillar is not prefabricated, is all build in the later stage, and wet trade is more, it is necessary to use substantial amounts of template.
Therefore, how to simplify the construction method of prefabricated construction, reduce the link cost of prefabricated wall column, improve the prefabrication and assembly construction rate of building, be this area technical problem urgently to be resolved hurrily.
Summary of the invention
It is an object of the invention to provide a kind of prefabricated wall column one-part form steel bar connecting structure and method, improve the strength and stiffness connected between reinforcing bar, ensure that the safety of structure, and avoid adopting electric welding to connect the toxic and harmful produced, ensure the working security of workmen.
For solving above-mentioned technical problem, the present invention provides following technical scheme:
A kind of prefabricated wall column one-part form steel bar connecting structure, including on, the prefabricated wall column in lower section, each prefabricated wall column upper, stagger respectively and arrange reserved steel bar in lower end, the top of the reserved steel bar of the upper end of described prefabricated wall column is provided with external screw thread a threaded sleeve, described sleeve up/down perforation, the lower end of described sleeve offers the female thread for threadeding with the described reserved steel bar of prefabricated wall column, the upper end barrel of sleeve offers a grout hole, the reserved steel bar of the lower end of the prefabricated wall column in top is inserted in the sleeve of the upper end of the prefabricated wall column in lower section, it is in the milk in described sleeve by described grout hole, on, the butted part concreting of the prefabricated wall column in lower section.
Preferably, in above-mentioned prefabricated wall column one-part form steel bar connecting structure, also include horizontal structure reinforcing bar, described horizontal structure reinforcing bar is before the butted part of the prefabricated wall column of upper and lower is built, reserved steel bar through the upper end of the prefabricated wall column in lower section, and the butted part formed by integrally casting carrying out bar connecting, horizontal structure and upper and lower prefabricated wall column forms, the top of concrete of the prefabricated wall column in described lower section is close to the lower surface of described horizontal structure.
Preferably, in above-mentioned prefabricated wall column one-part form steel bar connecting structure, described grout hole is positioned at the top of the barrel of described sleeve.
Preferably, in above-mentioned prefabricated wall column one-part form steel bar connecting structure, the length in reserve of described reserved steel bar is 500mm-1000mm.
Preferably, in above-mentioned prefabricated wall column one-part form steel bar connecting structure, described prefabricated wall column is dry wall or prefabricated post.
The invention also discloses a kind of prefabricated wall column one-part form connecting method for reinforcing bars, adopt prefabricated wall column one-part form steel bar connecting structure as above, comprise the steps:
The first step, the prefabricated wall column of ground floor of constructing on wall column basis；
Second step, the lifting prefabricated wall column of the second layer, the lower end reserved steel bar of the prefabricated wall column of the second layer as the prefabricated wall column in top is inserted as in the sleeve of the reserved steel bar of the upper end of the prefabricated wall column of ground floor when front lower place dry wall post, and adopt grouting material to pass through to reserve grout hole toward grouting construction in described sleeve；
3rd step, passes horizontal structure reinforcing bar the reserved steel bar of the upper end as the prefabricated wall column of ground floor when front lower place dry wall post, and carries out bar connecting；
4th step, Feng Mohou, the butted part of horizontal structure and current upper and lower two prefabricated wall columns is carried out formed by integrally casting.
5th step, repeating second step to the 4th step, upwards constructing successively, until completing the construction of the prefabricated wall column of all layers.
Preferably, in the described first step, stagger on described wall column basis reserved reinforcement foundation, the screw top of reinforcement foundation connects a sleeve as above, the reserved steel bar of the lower end of the prefabricated wall column of ground floor inserts in the sleeve of described reinforcement foundation, grouting construction in the sleeve of described reinforcement foundation, after grouting, builds after the enfeoffment mould in docking section basic with wall column to the prefabricated wall column of ground floor.
Preferably, after the 5th step, roof steel bar traverse is currently located at the reserved steel bar of the upper end of the prefabricated wall column of the top, carries out bar connecting, Feng Mohou, top board is built.
By techniques disclosed above scheme it can be seen that compared with prior art, beneficial effects of the present invention is as follows:
(1) between the prefabricated wall column of the present invention, reinforcing bar adopts sleeve connection; one end of sleeve and lower end are connected with a prefabricated wall column i.e. reserved steel bar bolt of the prefabricated wall column in lower section; the other end of sleeve and upper end are inserted for another the prefabricated wall column i.e. reserved steel bar of the prefabricated wall column in top and are passed through grouting and connect; improve the strength and stiffness connected between reinforcing bar; ensure that the safety of structure; and avoid adopting electric welding to connect the toxic and harmful produced; ensure the working security of workmen, be conducive to environmental conservation.
(2) the horizontal structure reinforcing bar of the present invention is before the butted part of the prefabricated wall column of upper and lower is built, reserved steel bar through the upper end of the prefabricated wall column in lower section, and carry out bar connecting, the butted part formed by integrally casting of horizontal structure and upper and lower prefabricated wall column forms, and the top of concrete of the prefabricated wall column in described lower section is close to the lower surface of described horizontal structure.Due to when the prefabricated wall column of each upper and lower is attached, one layer of horizontal structure of construction all simultaneously, therefore, the connection of a dry wall intercolumniation is had only between each layer and adjacent level structure, compare dry wall intercolumniation in Normal practice and each layer and connect the way of twice, effectively reduce the use consumption of the steel such as sleeve, reduce construction cost.
(3) the prefabrication and assembly construction rate of the present invention is higher, and prefabricated wall column can be prefabricated in advance, does not account for the duration, and working (machining) efficiency is high, it is possible to effectively accelerating construction progress.
Accompanying drawing explanation
Fig. 1 is the structural representation of the prefabricated wall column one-part form steel bar connecting structure of one embodiment of the invention；
Fig. 2 is the structural representation of the prefabricated wall column one-part form steel bar connecting structure of one embodiment of the invention；
In figure: the prefabricated wall column of 1-, 2-reserved steel bar, 3-sleeve, 4 horizontal structure reinforcing bars, 5-horizontal structure.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.According to description below and claims, advantages and features of the invention will be apparent from.Hereinafter by cited embodiment in conjunction with accompanying drawing, technology contents and the feature of the present invention will be described in detail.Need to additionally illustrating, accompanying drawing all adopts the form simplified very much and all uses non-ratio accurately, only in order to convenience, the purpose aiding in illustrating the embodiment of the present invention lucidly.For sake of convenience, described below " on ", the upper and lower direction of D score and accompanying drawing consistent, but this can not become the restriction of technical solution of the present invention.
Embodiment one
Refer to the structural representation of the prefabricated wall column 1 one-part form steel bar connecting structure that Fig. 1, Fig. 1 are one embodiment of the invention.nullPresent embodiment discloses a kind of prefabricated wall column 1 one-part form steel bar connecting structure，Including on、The prefabricated wall column 1 in lower section，Each prefabricated wall column 1 upper、Stagger respectively and arrange reserved steel bar 2 in lower end，The top of the reserved steel bar 2 of the upper end of described prefabricated wall column 1 is provided with external screw thread (not shown) a threaded sleeve 3，Described sleeve 3 up/down perforation，The lower end of described sleeve 3 offers the female thread (not shown) for threadeding with the described reserved steel bar 2 of prefabricated wall column 1，The upper end barrel of described sleeve 3 is offered a grout hole (not shown)，Two prefabricated wall columns 1 arrange one end of sleeve 3 respectively upward，The reserved steel bar 2 of the lower end of the prefabricated wall column 1 in top is inserted in the sleeve 3 of the upper end of the prefabricated wall column 1 in lower section，It is in the milk in described sleeve 3 by described grout hole，On、The butted part concreting of the prefabricated wall column 1 in lower section.The present invention utilizes sleeve 3 not only to realize the convenient connection of two prefabricated wall columns 1, and being reliably connected of two prefabricated wall columns 1 can be improved, one end of sleeve 3 and lower end are connected with reserved steel bar 2 bolt of an i.e. prefabricated wall column 1 in lower section of prefabricated wall column 1, the other end of sleeve 3 and upper end are inserted for another prefabricated wall column 1 i.e. reserved steel bar 2 of the prefabricated wall column 1 in top and are passed through grouting and connect, be effectively increased between reinforcing bar and reinforcing bar connect strength and stiffness, on the one hand, ensure that the safety of structure, on the other hand, avoid adopting electric welding to connect the toxic and harmful produced, ensure the working security of workmen.
Preferably, in above-mentioned prefabricated wall column 1 one-part form steel bar connecting structure, also include horizontal structure reinforcing bar 4, described horizontal structure reinforcing bar 4 is before the butted part of the prefabricated wall column 1 of upper and lower is built, reserved steel bar 2 through the upper end of the prefabricated wall column 1 in lower section, and carry out bar connecting, the butted part formed by integrally casting of horizontal structure 5 and upper and lower prefabricated wall column 1 forms, namely the dotted portion formed by integrally casting in Fig. 1 forms, and the top of concrete of the prefabricated wall column in described lower section 1 is close to the lower surface of described horizontal structure 5.Due to when the prefabricated wall column 1 of each upper and lower is attached, one layer of horizontal structure 5 of construction all simultaneously, therefore, the connection (namely reinforcing bar one-part form connects) between prefabricated wall column 1 is had only to once between each layer and adjacent level structure 5, compare the way connecting twice in Normal practice and each layer between prefabricated wall column 1, effectively reduce sleeve 3 consumption, reduce construction cost.
In order to as much as possible toward grouting in sleeve 3, it is preferred that in above-mentioned prefabricated wall column 1 one-part form steel bar connecting structure, described grout hole is positioned at the top of the barrel of described sleeve 3.
In order to provide enough working place to workmen, it is preferred that in above-mentioned prefabricated wall column 1 one-part form steel bar connecting structure, the length in reserve of described reserved steel bar 2 is 500mm-1000mm.When need not horizontal structure 5 being set between the prefabricated wall column 1 of two docking, when the length in reserve of usual reserved steel bar 2 is about 500mm, the working place needed for workmen can be met；When needing to arrange horizontal structure 5 between the prefabricated wall column 1 of two docking, needing to increase the thickness of this horizontal structure 5 in reserved length, now, general reserved length is between 800mm-1000mm.
Please continue to refer to Fig. 1, the present embodiment also discloses a kind of prefabricated wall column 1 one-part form connecting method for reinforcing bars, the i.e. construction method of prefabricated construction, adopts the prefabricated wall column 1 one-part form steel bar connecting structure as described in embodiment one, comprises the steps:
The first step, the prefabricated wall column 1 of ground floor of constructing on wall column basis；
Second step, the lifting prefabricated wall column 1 of the second layer, the lower end reserved steel bar 2 of the prefabricated wall column of the second layer 1 as the prefabricated wall column in top 1 is inserted in the sleeve 3 of the reserved steel bar 2 of the upper end when the prefabricated wall column 1 of the ground floor of front lower place dry wall post 1, and adopts grouting material to pass through reserved grout hole toward grouting construction in sleeve 3；
3rd step, using horizontal structure reinforcing bar 4 through the reserved steel bar 2 as the upper end when the prefabricated wall column 1 of the ground floor of front lower place dry wall post 1, and carries out bar connecting；
4th step, Feng Mohou, the butted part of horizontal structure 5 and current upper and lower two prefabricated wall columns 1 is carried out formed by integrally casting.
5th step, repeating second step to the 4th step, upwards constructing successively, until completing the construction of the prefabricated wall column 1 of all layers.
On the one hand; between the prefabricated wall column 1 of the present invention, reinforcing bar adopts sleeve 3 to connect; one end of sleeve 3 is connected with reserved steel bar 2 bolt of a prefabricated wall column 1; the other end of sleeve 3 inserts for the reserved steel bar 2 of another prefabricated wall column 1 and passes through grouting connection; improve the strength and stiffness connected between reinforcing bar, it is ensured that the safety of structure, and avoid adopting electric welding to connect the toxic and harmful produced; ensure the working security of workmen, be conducive to environmental conservation.
On the other hand, the present invention is when adjacent two prefabricated wall columns 1 connect every time, carry out the construction of horizontal structure 5 simultaneously, therefore, the connection (namely reinforcing bar one-part form connects) between prefabricated wall column 1 is had only to once between each layer and adjacent level structure 5, compare the way connecting twice in each layer of Normal practice between prefabricated wall column 1, effectively reduce sleeve 3 consumption, reduce construction cost.Additionally, prefabricated wall column 1 can be prefabricated in advance in the present invention, not accounting for the duration, working (machining) efficiency is high, it is possible to effectively accelerating construction progress.
Preferably, in the described first step, stagger on described wall column basis reserved reinforcement foundation, the screw top of reinforcement foundation connects a sleeve 3 as above, the reserved steel bar 2 of the lower end of the prefabricated wall column of ground floor 1 inserts in the sleeve 3 of described reinforcement foundation, grouting construction in the sleeve 3 of described reinforcement foundation, after grouting, builds after the enfeoffment mould in docking section basic with wall column to the prefabricated wall column 1 of ground floor.Construct together with wall column basis in advance due to base plate complete, therefore, when being attached between the prefabricated wall column 1 of ground floor and wall column basis, it is not necessary to carry out the construction of horizontal structure 5.
Preferably, after the 5th step, roof steel bar traverse is currently located at the reserved steel bar 2 of the upper end of the prefabricated wall column 1 of the top, carries out bar connecting, Feng Mohou, top board is built.So, it is possible to complete the construction of the horizontal structure of top board and the superiors so that formed between top board and the prefabricated wall column 1 of the top and be reliably connected.
In the present embodiment, described prefabricated wall column 1 is prefabricated post.Certainly, described prefabricated wall column 1 can also be dry wall, as shown in Figure 2.nullThe precast wall body method of attachment comparing existing routine is at floor、Reserved steel plate between prefabricated panel，Then bolt is adopted to carry out being mechanically connected or adopt electric welding to connect，Precast wall body between adjacent level structure at least needs twice connection construction，Not only waste time and energy，Corresponding steel plate make large usage quantity，The problem causing high cost，Between the prefabricated wall column of the present invention, reinforcing bar adopts sleeve connection，One end of sleeve and lower end are connected with a prefabricated wall column i.e. reserved steel bar bolt of the prefabricated wall column in lower section，The other end of sleeve and upper end are inserted for another the prefabricated wall column i.e. reserved steel bar of the prefabricated wall column in top and are passed through grouting and connect，Improve the strength and stiffness connected between reinforcing bar，Ensure that the safety of structure，And avoid adopting electric welding to connect the toxic and harmful produced，Ensure the working security of workmen，Be conducive to environmental conservation.
In addition, the horizontal structure reinforcing bar of the present invention is before the butted part of the prefabricated wall column of upper and lower is built, reserved steel bar through the upper end of the prefabricated wall column in lower section, and carry out bar connecting, the butted part formed by integrally casting of horizontal structure and upper and lower prefabricated wall column forms, and the top of concrete of the prefabricated wall column in described lower section is close to the lower surface of described horizontal structure.Due to when the prefabricated wall column of each upper and lower is attached, one layer of horizontal structure of construction all simultaneously, therefore, the connection of a dry wall intercolumniation is had only between each layer and adjacent level structure, compare dry wall intercolumniation in Normal practice and each layer and connect the way of twice, effectively reduce the use consumption of the steel such as sleeve, reduce construction cost.
Foregoing description is only the description to present pre-ferred embodiments, not any restriction to the scope of the invention, any change that the those of ordinary skill in field of the present invention does according to the disclosure above content, modification, belongs to the protection domain of claims.
Claims (9)
1. a prefabricated wall column one-part form steel bar connecting structure, including on, the prefabricated wall column in lower section, each prefabricated wall column upper, stagger respectively and arrange reserved steel bar in lower end, it is characterized in that, the top of the reserved steel bar of the upper end of described prefabricated wall column is provided with external screw thread a threaded sleeve, described sleeve up/down perforation, the lower end of described sleeve offers the female thread for threadeding with described reserved steel bar, the upper end barrel of described sleeve offers a grout hole, the reserved steel bar of the lower end of the prefabricated wall column in top is inserted in the sleeve of the upper end of the prefabricated wall column in lower section, it is in the milk in described sleeve by described grout hole, on, the butted part concreting of the prefabricated wall column in lower section.
2. the prefabricated wall column one-part form steel bar connecting structure described in claim 1, it is characterized in that, also include horizontal structure reinforcing bar, described horizontal structure reinforcing bar is before the butted part of the prefabricated wall column of upper and lower is built, reserved steel bar through the upper end of the prefabricated wall column in lower section, and the butted part formed by integrally casting carrying out bar connecting, horizontal structure and upper and lower prefabricated wall column forms, the top of concrete of the prefabricated wall column in described lower section is close to the lower surface of described horizontal structure.
3. prefabricated wall column one-part form steel bar connecting structure as claimed in claim 1, it is characterised in that described grout hole is positioned at the top of the barrel of described sleeve.
4. prefabricated wall column one-part form steel bar connecting structure as claimed in claim 1, it is characterised in that the length in reserve of described reserved steel bar is 500mm-1000mm.
5. prefabricated wall column one-part form steel bar connecting structure as claimed in claim 1, it is characterised in that described prefabricated wall column is dry wall.
6. prefabricated wall column one-part form steel bar connecting structure as claimed in claim 1, it is characterised in that described prefabricated wall column is prefabricated post.
7. a prefabricated wall column one-part form connecting method for reinforcing bars, it is characterised in that adopt the prefabricated wall column one-part form steel bar connecting structure as described in any one in claim 1-6, comprise the steps:
The first step, the prefabricated wall column of ground floor of constructing on wall column basis；
Second step, the lifting prefabricated wall column of the second layer, the lower end reserved steel bar of the prefabricated wall column of the second layer as the prefabricated wall column in top is inserted as in the sleeve of the reserved steel bar of the upper end of the prefabricated wall column of ground floor when front lower place dry wall post, and adopt grouting material to pass through to reserve grout hole toward grouting construction in described sleeve；
3rd step, passes horizontal structure reinforcing bar the reserved steel bar of the upper end as the prefabricated wall column of ground floor when front lower place dry wall post, and carries out bar connecting；
4th step, Feng Mohou, the butted part of horizontal structure and current upper and lower two prefabricated wall columns is carried out formed by integrally casting.
5th step, repeating second step to the 4th step, upwards constructing successively, until completing the construction of the prefabricated wall column of all layers.
8. prefabricated wall column one-part form connecting method for reinforcing bars as claimed in claim 7, it is characterized in that, in the first step, stagger on described wall column basis reserved reinforcement foundation, the screw top of reinforcement foundation connects a sleeve as above, and the reserved steel bar of the lower end of the prefabricated wall column of ground floor inserts in the sleeve of described reinforcement foundation, grouting construction in the sleeve of described reinforcement foundation, after grouting, build after the enfeoffment mould in docking section basic with wall column to the prefabricated wall column of ground floor.
9. prefabricated wall column one-part form connecting method for reinforcing bars as claimed in claim 7, it is characterised in that after the 5th step, is currently located at roof steel bar traverse the reserved steel bar of the upper end of the prefabricated wall column of the top, carries out bar connecting, Feng Mohou, top board is built.
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| CN113047530A (en) * | 2021-05-17 | 2021-06-29 | 吉林建筑大学设计研究院有限责任公司 | Vertical steel bar connecting sleeve and connecting method of concrete member or finished steel bar cage |
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