CN112647597A - Construction method of high-altitude large-cantilever concrete beam plate structure - Google Patents
Construction method of high-altitude large-cantilever concrete beam plate structure Download PDFInfo
- Publication number
- CN112647597A CN112647597A CN202011570686.XA CN202011570686A CN112647597A CN 112647597 A CN112647597 A CN 112647597A CN 202011570686 A CN202011570686 A CN 202011570686A CN 112647597 A CN112647597 A CN 112647597A
- Authority
- CN
- China
- Prior art keywords
- cast
- concrete
- cantilever
- place
- slab
- 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
Images
Classifications
-
- 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
- E04B1/34—Extraordinary structures, e.g. with suspended or cantilever parts supported by masts or tower-like structures enclosing elevators or stairs; Features relating to the elastic stability
-
- 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
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
- E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
- E04B5/38—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element
-
- 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
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
-
- 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
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/16—Members, e.g. consoles, for attachment to the wall to support girders, beams, or the like carrying forms or moulds for floors, lintels, or transoms
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention belongs to the field of building construction, and relates to a construction method of a high-altitude large-cantilever concrete beam plate structure, which comprises a cast-in-place concrete large-cantilever structural beam and an assembled precast concrete composite slab, wherein the cast-in-place height of the structural beam is reduced through reinforcement optimization; after the strength grade of the beam body concrete of the cast-in-place concrete large cantilever structure beam reaches 100% or above the design strength, removing the cast-in-place cantilever structure beam template supporting system; the prefabricated concrete assembled composite slab is installed by depending on the cast-in-place concrete large cantilever structure beam, and no supporting system is arranged at the lower part of the prefabricated concrete assembled composite slab; assembling the connecting steel bars of the laminated slab and the structural beam, and pouring the concrete of the laminated layer to finally form a complete high-altitude large-cantilever concrete beam slab structure. The invention not only greatly saves the construction cost investment such as the installation and the removal of the template, but also has the advantages of small danger of high-altitude operation, simple process, convenient operation, high construction speed, high quality standard, high construction mechanization degree and the like.
Description
Technical Field
The invention belongs to the field of building construction, and particularly relates to construction of a high-altitude large-cantilever concrete beam plate.
Background
With the continuous development of economy, the requirements of people on individuation are continuously improved. In the field of buildings, personalized outstanding building structures and application of various high-altitude large cantilever structures continuously appear, and the uniqueness of the appearance characteristics of the buildings is revealed. The method is characterized in that an outward-expanding overhanging space is arranged on a high-rise building, which is the most common construction mode at present, and the requirements of individual buildings are met by setting the shape of an individual overhanging. The existing common large cantilever concrete beam slab structure mostly adopts a cast-in-place concrete process, for example, Chinese patent 200910115141.7 discloses a construction method of a high-altitude cantilever structure of a high-rise building, a design scheme is given firstly, then a bearing structure and a bearing structure are cast in place successively according to the design scheme, the structure of a support frame structure is complex, a large cantilever operation platform needs to be built on a high-altitude position in a large area, and a plurality of difficulties and inconveniences are brought to construction; the construction period is prolonged, the material investment of the template supporting system is increased, and the construction cost is greatly improved; meanwhile, the safety risk of high-altitude construction is increased, and particularly, safety accidents of high-altitude falling easily occur in the process of erecting and dismantling a high-altitude operation platform by construction operators, so that adverse effects and losses are caused to the society and families.
Disclosure of Invention
The invention aims to overcome the defects of the traditional cast-in-place concrete technology process of the high-altitude part large cantilever concrete beam plate structure at present, and provides a construction method of the high-altitude large cantilever concrete beam plate structure, and integrated construction of combination of a high-altitude cast-in-place concrete large cantilever beam and a prefabricated assembly type concrete composite slab. The traditional cast-in-place concrete process of the cantilever concrete beam plate structure is technically innovated and optimized in design, so that the construction technical difficulty is reduced, the risk of high-altitude construction is reduced, and the cast-in-place concrete process has the advantages of simple process, convenience in operation, high construction speed, good economic benefit, high construction mechanization and industrialization degree and the like.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a construction method of a high-altitude large-cantilever concrete beam plate structure comprises the steps of casting a concrete large-cantilever structure beam and assembling a precast concrete composite slab,
s1, cast in situ concrete hangs the structure roof beam greatly: reducing the cast-in-place height of the structural beam, wherein the cast-in-place height of the structural beam is equal to the effective section height of the originally designed large cantilever structural beam minus the thickness of the originally designed cast-in-place structural slab, and reinforcing bars are optimized; the method comprises the following steps that (1) a cast-in-place concrete large cantilever structure beam is cast, and after the strength grade of beam body concrete reaches 100% or above of the design strength, a cast-in-place cantilever structure beam template supporting system is dismounted;
s2, assembling the precast concrete composite slab: the lower part of the prefabricated concrete assembly type composite slab is not provided with any supporting system any more, the prefabricated concrete assembly type composite slab is installed by relying on the cast-in-place concrete large cantilever structure beam, the connecting reinforcing steel bars of the composite slab and the structure beam are assembled, the concrete of the composite layer is poured, and finally the complete high-altitude large cantilever concrete beam slab structure is formed.
Further, the construction process comprises the following steps:
s1, cast in situ concrete hangs the structure roof beam greatly:
(1) before the construction of the cast-in-place concrete large cantilever structure beam, subtracting the thickness of the originally designed cast-in-place structure plate from the effective section height of the originally designed large cantilever structure beam to obtain the height of the cast-in-place concrete large cantilever structure beam; the beam slab load of the original design cast-in-place structure is taken, the reinforcement areas of the stressed main reinforcements, the stirrups and the constructional reinforcements are recalculated according to the calculated effective section height of the cast-in-place large cantilever structure beam and the original design concrete strength, and the reinforcement of the large cantilever cast-in-place structure beam is adjusted and optimized according to the calculated effective section height and the calculated reinforcement areas;
(2) calculating the requirements of the optimized large cantilever cast-in-place structural beam on a template support system according to the cantilever length and the section size of the optimized large cantilever cast-in-place structural beam, and calculating and designing a light steel structure combined truss and a connecting piece thereof according to the requirements to meet the requirements of the large cantilever cast-in-place structural beam on the strength, the rigidity and the stability of the template support system; then, according to the design scheme requirement of the template support system, manufacturing a light steel structure shaping combined truss and a connecting piece thereof;
(3) in the construction process of the lower 2 and 1 floors of the floor where the cast-in-place concrete large cantilever beam is located, beam penetrating bolt holes of connecting pieces are reserved at equal positions on two sides of the central axis of the large cantilever cast-in-place structural beam, and torsion-resistant steel bars are arranged at the positions where the beam penetrating bolt holes are reserved for reinforcing treatment; before the construction of the large cantilever cast-in-place structural beam, according to the design scheme requirement of a template supporting system in the step (2), the light steel structure shaping combined truss and the auxiliary safety guard rails thereof are installed to form a high-altitude operation platform;
(4) erecting a template supporting system of a large-cantilever cast-in-place structural beam on a high-altitude operation platform, binding structural beam reinforcing steel bars, reserving connecting reinforcing steel bars with prefabricated laminated slabs on the upper surface of the structural beam, pouring concrete together with the structural beam slab of the floor where the structural beam slab is located, and maintaining in time;
(5) after the concrete strength of the cast-in-situ cantilever structural beam reaches 100% or more of the design strength, sequentially removing the beam template, the template supporting system, the light steel structure shaping combined truss and the auxiliary components thereof, and completing the construction of the large cantilever cast-in-situ structural beam;
s2, prefabricating the concrete assembled composite slab, hoisting the prefabricated concrete composite slab, connecting and fixing the anchoring steel bars of the composite slab and the embedded connecting steel bars of the structural beam, binding the steel bars of the composite slab and pouring concrete to form a high-altitude large-cantilever concrete beam slab structure consistent with the original design, and completing construction of the high-altitude large-cantilever concrete beam slab structure.
Further, S1, the cast-in-place concrete large cantilever structural beam: the cross section width, the overhanging length and the beam bottom elevation of the cast-in-place large overhanging structural beam are the same as those of the originally designed cast-in-place large overhanging structural beam, and the cross section height is equal to the cross section height of the originally designed cast-in-place large overhanging structural beam minus the thickness of the originally designed cast-in-place structural plate; recalculating the reinforcement area according to the beam slab load and the concrete strength of the originally designed cast-in-place structure, adjusting and optimizing the reinforcement of the cast-in-place concrete large cantilever structure beam according to the calculated reinforcement area, and delivering the adjusted reinforcement to an original design unit for auditing and obtaining agreement; the edge of the top surface of the cast-in-place concrete large cantilever structure beam is smooth, the middle of the top surface is treated by a rough surface, the middle of the top surface is provided with vertical connecting short steel bars and horizontal connecting steel bars which are communicated along the length direction of the beam, and the top surface of the beam is not provided with exposed stirrups.
Further, S1, the cast-in-place concrete large cantilever structural beam: wherein the vertical connecting short steel bars in the step (1) are anchored in the cast-in-place concrete large cantilever structure beam, the distance between the vertical connecting short steel bars in the length direction of the cantilever beam is 200-1000mm, the exposed length is 30-50mm, and the diameter of the steel bars is 8-16 mm.
Further, S1, the cast-in-place concrete large cantilever structural beam: wherein the horizontal connecting steel bars in the step (1) are horizontally communicated along the length direction of the beam and are bound and connected with the vertical connecting short steel bars, and the diameter of the steel bars is 8-16 mm.
Further, S1, the cast-in-place concrete large cantilever structural beam: the cast-in-place cantilever structure beam template supporting system adopts a light steel structure shaping combined truss as a main stress and force transmission component, the light steel structure shaping combined truss is formed by sequentially assembling and combining a plurality of light steel components, the light steel structure shaping combined truss is arranged at the outer side parts of a 2 nd layer and a 1 st layer of structure beams or shear walls under a cantilever beam and is fixed on the 2 nd layer and the 1 st layer of structure beams or shear walls under the cantilever beam through beam penetrating bolts; the weight of the single-piece combined truss is not more than 1000 kg; the tool type safety protection railing is arranged at the position, which is in the air, on the periphery of the combined truss, is made of light steel components according to a uniform size, and is connected and fixed with the combined truss through bolts; the height of the protective railing is not less than 1.2m, and dense mesh safety nets are wrapped around the safety protective railing; and before the prefabricated concrete assembled composite slab is installed, removing all the light steel structure shaping combined truss support systems.
Further, in S2, assembling the precast concrete composite slab: the precast concrete fabricated composite slab is a precast concrete fabricated composite slab which is composed of a plurality of splicing units and is optimized and decomposed on the basis of the originally designed high-altitude large-cantilever full-cast-in-place concrete beam structure, the structural form of the precast concrete fabricated composite slab is a simple supporting plate, and two ends of the precast concrete fabricated composite slab are placed on the top surface of the cast-in-place concrete large-cantilever structural beam; the cross section of the laminated slab is rectangular, the span and the slab bottom elevation of the laminated slab are the same as those of the originally designed cast-in-situ large cantilever structural slab, and the thickness of the prefabricated thickness and the thickness of the cast-in-situ laminated slab of the laminated slab are equal to the thickness of the originally designed cast-in-situ structural slab; recalculating and adjusting the reinforcement of the laminated slab according to the slab load and the concrete strength of the original design cast-in-place structure, and sending the adjusted laminated slab to an original design unit for auditing and obtaining the agreement; and a horizontal overhanging reinforcing steel bar is arranged at the connecting part of the prefabricated concrete assembled laminated slab and the cast-in-place concrete large cantilever structural beam and is bound and fixed with the horizontal connecting reinforcing steel bar on the top surface of the cast-in-place concrete large cantilever structural beam.
The invention carries out technical innovation and design optimization on the traditional cast-in-place concrete process of the high-altitude large-cantilever concrete beam plate structure, greatly reduces the construction technical difficulty of the high-altitude large-cantilever concrete beam plate structure, adopts the traditional cast-in-place construction process only for the large-cantilever concrete structure beam, replaces the cast-in-place concrete cantilever plate of the traditional process with the precast concrete laminated slab, cancels a template supporting system of the large-cantilever structure plate and greatly saves the construction cost and expense; by optimizing the reinforcing bars of the structural beam, the cast-in-place height of the structural beam is reduced, so that the technical requirements of the large cantilever concrete structural beam on a self template support system are further reduced; the light steel structure shaping combined truss is used as a main stress and force transmission component of the cast-in-place cantilever structure beam formwork supporting system, so that the safety of the formwork supporting system is improved, the cost and investment are low, the installation and the removal are convenient, repeated turnover and use are convenient, and the construction technical difficulty of a high-altitude large cantilever operation platform is greatly reduced; the fabricated concrete composite slab produced by batch prefabrication in a factory has smooth and flat surface, no honeycomb pitted surface and appearance quality far higher than that of a cast-in-place concrete slab. Therefore, the invention not only greatly saves construction cost investment such as template installation and removal, but also has the advantages of small high-altitude operation danger, simple process, convenient operation, high construction speed, good economic benefit, high quality standard, high construction mechanization and industrialization degree and the like, and the economic benefit is remarkable, thereby being a new technology worthy of popularization.
Drawings
FIG. 1 is a front view of a high-altitude large-cantilever cast-in-place concrete structure beam formwork supporting system
FIG. 2 is a top view of a high-altitude large-cantilever cast-in-place concrete structure beam formwork supporting system
FIG. 3 is a side view of a high altitude large cantilever cast-in-place concrete structure beam formwork support system
FIG. 4 is a side view of precast concrete fabricated deck installation
FIG. 5 is a plan view showing the structure of the prefabricated concrete fabricated plywood installation
FIG. 6 is a cross-sectional view taken along line 1-1 in FIGS. 4 and 5
FIG. 7 is a structural diagram of a high-altitude large-cantilever concrete beam plate structure after construction
FIG. 8 is a sectional view taken along line 2-2 in FIG. 7
FIG. 9 is an enlarged view of a portion 1 of FIG. 3
FIG. 10 is an enlarged view of a portion 2 of FIG. 3
In the figure: 1. cast-in-place concrete large cantilever structural beam; 2. a formwork support system; 3. shaping the combined truss by using a light steel structure; 4. connecting bolts for penetrating beams (walls); 5. connecting and fixing the steel plates; 6. the 2 nd layer of structural beam (shear wall) below the cantilever beam; 7. the 1 st layer of structural beam (shear wall) below the cantilever beam; 8. reserving beam (wall) penetrating bolt holes; 9. the light steel structure is horizontally connected with the beam; 10. a safety guard rail; 11. prefabricating a concrete assembled laminated slab; 12. vertically connecting short steel bars; 13. horizontally connecting the reinforcing steel bars; 14. Horizontally extending the steel bars outwards of the laminated slab; 15. and (5) laminating the layer concrete.
Detailed Description
For the purpose of enhancing an understanding of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
The structure diagram of the high-altitude large-cantilever cast-in-place concrete structure beam formwork supporting system is shown in figures 1-3, the structure diagram of the prefabricated concrete assembly type composite slab installation is shown in figures 4-6, and the structure diagram of the high-altitude large-cantilever concrete beam slab structure after the construction is finished is shown in figures 7-8.
As can be seen from the figures 7-8, the structural diagram of the invention is composed of a cast-in-place concrete large cantilever structural beam and a precast concrete fabricated composite slab, and after the precast concrete fabricated composite slab is hoisted in place, a superposed layer of concrete is poured to form a high-altitude large cantilever concrete beam structure consistent with the original design.
The process flow of the invention is as follows:
reducing the section height of the cast-in-place concrete large cantilever structure beam, optimizing and adjusting a reinforcement scheme → calculating and designing a cast-in-place concrete large cantilever structure beam template supporting system → designing and manufacturing a light steel structure sizing combined truss and an auxiliary safety protection facility → installing the light steel structure sizing combined truss and the auxiliary safety protection facility → installing the cast-in-place concrete large cantilever structure beam template supporting system → constructing the cast-in-place concrete large cantilever structure beam → dismantling the template supporting system, the light steel structure sizing combined truss and the auxiliary facility → hoisting a prefabricated composite layer and constructing a composite layer.
S1, cast in situ concrete hangs the structure roof beam greatly:
section height of cast-in-place concrete large cantilever structure beam is reduced, and reinforcing bar scheme is optimized and adjusted
Subtracting the thickness of the originally designed cast-in-place structural slab from the effective section height of the originally designed large cantilever structural beam to obtain the section height of the cast-in-place concrete large cantilever structural beam 1; and (3) taking the beam slab load of the original design cast-in-place structure, recalculating the reinforcement areas of the stressed main reinforcement, the stirrups and the constructional reinforcements according to the calculated cross-sectional height of the cast-in-place large cantilever structure beam and the original design concrete strength, and adjusting and optimizing the reinforcement of the large cantilever cast-in-place structure beam according to the calculated reinforcement areas (which need to be submitted to an original design unit for examination and approval).
Secondly, calculating and designing a cast-in-place concrete large cantilever structure beam template supporting system
And calculating the requirements of the cast-in-place concrete large cantilever structural beam 1 on the template supporting system 2 according to the optimized cantilever length and section size of the cast-in-place concrete large cantilever structural beam 1, calculating and designing the light steel structure shaping combination truss 3 and the connection and fixing system of the light steel structure shaping combination truss and the main structure according to the requirements, so that the requirements of the cast-in-place concrete large cantilever structural beam on the strength, rigidity and stability of the template supporting system 2 are met, and finally forming a template supporting system design scheme of the cast-in-place concrete large cantilever structural beam.
Designing and manufacturing light steel structure shaping combined truss and attached safety protection facility
According to the design scheme requirements of the template supporting system, manufacturing a light steel structure shaping combined truss 3, a beam (wall) penetrating connecting bolt 4 of a main body structure and a connecting and fixing steel plate 5; in the construction process of the lower 2 layers and the lower 1 layer of main structure of the floor where the cast-in-place concrete large cantilever structural beam 1 is located, beam (wall) penetrating bolt holes 8 are reserved on the 2 nd layer of structural beam (shear wall) 6 below the cantilever beam and the 1 st layer of structural beam (shear wall) 7 below the cantilever beam at equal positions on two sides of the designed central axis of the cast-in-place concrete large cantilever structural beam 1, and torsion-resistant steel bars are configured on the structural beam (or the shear wall) with the reserved beam (wall) penetrating bolt holes 8 for reinforcement treatment, so that the main structural beam (or the shear wall) at the position meets the strength and deformation requirements necessary for bearing the load transmitted by the light steel structure shaping combination truss 3.
Installing light steel structure shaping combined truss and auxiliary safety protection facility
Before the construction of the cast-in-place concrete large cantilever structure beam 1, according to the design scheme requirement of the template supporting system 2, the light steel structure shaping combination truss 3, the light steel structure horizontal connecting beam 9, the auxiliary safety protection railing 10 and the like are installed by adopting vertical hoisting equipment to form a high-altitude operation platform.
Formwork support system for installing cast-in-place concrete large cantilever structure beam
According to the design scheme of the template support system 2, the template support system 2 is erected on the high-altitude operation platform. The vertical rod bases of the template supporting system 2 are fixed on the light steel structure horizontal connecting beam 9 according to the design interval by bolts, then a template supporting scaffold, a beam bottom template and a beam side template are sequentially erected, and a fixing measure is adopted to form the template supporting system of the cast-in-place concrete large cantilever structure beam.
Construction of cast-in-place concrete large cantilever structure beam
And binding the steel bars of the cast-in-place concrete large cantilever structural beam 1, reserving vertical connecting short steel bars 12 and horizontal connecting steel bars 13 connected with the precast concrete assembled composite slab 11 on the upper surface of the cast-in-place concrete large cantilever structural beam, and pouring concrete together with the structural beam plate on the same floor and maintaining in time.
Seventhly, dismantling the formwork support system, the light steel structure shaping combination truss and the accessory facilities
After the concrete strength of the cast-in-place concrete large cantilever structure beam 1 reaches 100% or more of the design strength, the beam template supporting system 2, the safety protection railing 10, the light steel structure horizontal connecting beam 9, the beam (wall) penetrating connecting bolt 4, the connecting and fixing steel plate 5, the light steel structure shaping combined truss 3 and the auxiliary components thereof are sequentially removed, and the structural construction of the cast-in-place concrete large cantilever structure beam 1 is completed.
S2, assembling the precast concrete composite slab:
hoisting prefabricated laminated slab
Hoisting the precast concrete composite slab 11 by using vertical hoisting equipment, connecting and fixing the horizontal overhanging reinforcing steel bars 14 of the composite slab and the horizontal connecting reinforcing steel bars 13 of the cast-in-place concrete large cantilever structure beam 1, and binding the reinforcing steel bars of the composite slab;
second, construction of superposed layers
And pouring the superposed layer concrete 15 to form a high-altitude large-cantilever concrete beam plate structure consistent with the original design, and finishing the construction of the high-altitude large-cantilever concrete beam plate structure.
By adopting the method for construction, the construction period can be shortened by half, a supporting system is saved, the construction efficiency is greatly improved, and the construction quality is ensured at the same time.
Claims (7)
1. A construction method of a high-altitude large-cantilever concrete beam plate structure is characterized by comprising a cast-in-place concrete large-cantilever structural beam and an assembled precast concrete composite slab,
s1, cast in situ concrete hangs the structure roof beam greatly: reducing the cast-in-place height of the structural beam, wherein the cast-in-place height of the structural beam is equal to the effective section height of the originally designed large cantilever structural beam minus the thickness of the originally designed cast-in-place structural slab, and reinforcing bars are optimized; the method comprises the following steps that (1) a cast-in-place concrete large cantilever structure beam is cast, and after the strength grade of beam body concrete reaches 100% or above of the design strength, a cast-in-place cantilever structure beam template supporting system is dismounted;
s2, assembling the precast concrete composite slab: the lower part of the prefabricated concrete assembly type composite slab is not provided with any supporting system any more, the prefabricated concrete assembly type composite slab is installed by relying on the cast-in-place concrete large cantilever structure beam, the connecting reinforcing steel bars of the composite slab and the structure beam are assembled, the concrete of the composite layer is poured, and finally the complete high-altitude large cantilever concrete beam slab structure is formed.
2. The construction method of the high-altitude large-cantilever concrete beam plate structure as claimed in claim 1, wherein the construction process comprises the following steps:
s1, cast in situ concrete hangs the structure roof beam greatly:
(1) before the construction of the cast-in-place concrete large cantilever structure beam, subtracting the thickness of the originally designed cast-in-place structure plate from the effective section height of the originally designed large cantilever structure beam to obtain the height of the cast-in-place concrete large cantilever structure beam; the beam slab load of the original design cast-in-place structure is taken, the reinforcement areas of the stressed main reinforcements, the stirrups and the constructional reinforcements are recalculated according to the calculated effective section height of the cast-in-place large cantilever structure beam and the original design concrete strength, and the reinforcement of the large cantilever cast-in-place structure beam is adjusted and optimized according to the calculated effective section height and the calculated reinforcement areas;
(2) calculating the requirements of the optimized large cantilever cast-in-place structural beam on a template support system according to the cantilever length and the section size of the optimized large cantilever cast-in-place structural beam, and calculating and designing a light steel structure combined truss and a connecting piece thereof according to the requirements to meet the requirements of the large cantilever cast-in-place structural beam on the strength, the rigidity and the stability of the template support system; then, according to the design scheme requirement of the template support system, manufacturing a light steel structure shaping combined truss and a connecting piece thereof;
(3) in the construction process of the lower 2 and 1 floors of the floor where the cast-in-place concrete large cantilever beam is located, beam penetrating bolt holes of connecting pieces are reserved at equal positions on two sides of the central axis of the large cantilever cast-in-place structural beam, and torsion-resistant steel bars are arranged at the positions where the beam penetrating bolt holes are reserved for reinforcing treatment; before the construction of the large cantilever cast-in-place structural beam, according to the design scheme requirement of a template supporting system in the step (2), the light steel structure shaping combined truss and the auxiliary safety guard rails thereof are installed to form a high-altitude operation platform;
(4) erecting a template supporting system of a large-cantilever cast-in-place structural beam on a high-altitude operation platform, binding structural beam reinforcing steel bars, reserving connecting reinforcing steel bars with prefabricated laminated slabs on the upper surface of the structural beam, pouring concrete together with the structural beam slab of the floor where the structural beam slab is located, and maintaining in time;
(5) after the concrete strength of the cast-in-situ cantilever structural beam reaches 100% or more of the design strength, sequentially removing the beam template, the template supporting system, the light steel structure shaping combined truss and the auxiliary components thereof, and completing the construction of the large cantilever cast-in-situ structural beam;
s2, prefabricating the concrete assembled composite slab, hoisting the prefabricated concrete composite slab, connecting and fixing the anchoring steel bars of the composite slab and the embedded connecting steel bars of the structural beam, binding the steel bars of the composite slab and pouring concrete to form a high-altitude large-cantilever concrete beam slab structure consistent with the original design, and completing construction of the high-altitude large-cantilever concrete beam slab structure.
3. The construction method of the high-altitude large-cantilever concrete beam plate structure as claimed in claim 1, wherein the step S1 is that the cast-in-place concrete large-cantilever structural beam: the cross section width, the overhanging length and the beam bottom elevation of the cast-in-place large overhanging structural beam are the same as those of the originally designed cast-in-place large overhanging structural beam, and the cross section height is equal to the cross section height of the originally designed cast-in-place large overhanging structural beam minus the thickness of the originally designed cast-in-place structural plate; recalculating the reinforcement area according to the beam slab load and the concrete strength of the originally designed cast-in-place structure, adjusting and optimizing the reinforcement of the cast-in-place concrete large cantilever structure beam according to the calculated reinforcement area, and delivering the adjusted reinforcement to an original design unit for auditing and obtaining agreement; the edge of the top surface of the cast-in-place concrete large cantilever structure beam is smooth, the middle of the top surface is treated by a rough surface, the middle of the top surface is provided with vertical connecting short steel bars and horizontal connecting steel bars which are communicated along the length direction of the beam, and the top surface of the beam is not provided with exposed stirrups.
4. The construction method of the high-altitude large-cantilever concrete beam plate structure as claimed in claim 3, wherein the step S1 is that the cast-in-place concrete large-cantilever structural beam: wherein the vertical connecting short steel bars in the step (1) are anchored in the cast-in-place concrete large cantilever structure beam, the distance between the vertical connecting short steel bars in the length direction of the cantilever beam is 200-1000mm, the exposed length is 30-50mm, and the diameter of the steel bars is 8-16 mm.
5. The construction method of the high-altitude large-cantilever concrete beam plate structure as claimed in claim 3, wherein the step S1 is that the cast-in-place concrete large-cantilever structural beam: wherein the horizontal connecting steel bars in the step (1) are horizontally communicated along the length direction of the beam and are bound and connected with the vertical connecting short steel bars, and the diameter of the steel bars is 8-16 mm.
6. The construction method of the high-altitude large-cantilever concrete beam plate structure as claimed in claim 1, wherein the step S1 is that the cast-in-place concrete large-cantilever structural beam: the cast-in-place cantilever structure beam template supporting system adopts a light steel structure shaping combined truss as a main stress and force transmission component, the light steel structure shaping combined truss is formed by sequentially assembling and combining a plurality of light steel components, the light steel structure shaping combined truss is arranged at the outer side parts of a 2 nd layer and a 1 st layer of structure beams or shear walls under a cantilever beam and is fixed on the 2 nd layer and the 1 st layer of structure beams or shear walls under the cantilever beam through beam penetrating bolts; the weight of the single-piece combined truss is not more than 1000 kg; the tool type safety protection railing is arranged at the position, which is in the air, on the periphery of the combined truss, is made of light steel components according to a uniform size, and is connected and fixed with the combined truss through bolts; the height of the protective railing is not less than 1.2m, and dense mesh safety nets are wrapped around the safety protective railing; and before the prefabricated concrete assembled composite slab is installed, removing all the light steel structure shaping combined truss support systems.
7. The construction method for a high altitude and large cantilever concrete beam slab structure according to any one of claims 1 to 7, wherein the step S2 of assembling the precast concrete composite slab comprises the steps of: the precast concrete fabricated composite slab is a precast concrete fabricated composite slab which is composed of a plurality of splicing units and is optimized and decomposed on the basis of the originally designed high-altitude large-cantilever full-cast-in-place concrete beam structure, the structural form of the precast concrete fabricated composite slab is a simple supporting plate, and two ends of the precast concrete fabricated composite slab are placed on the top surface of the cast-in-place concrete large-cantilever structural beam; the cross section of the laminated slab is rectangular, the span and the slab bottom elevation of the laminated slab are the same as those of the originally designed cast-in-situ large cantilever structural slab, and the thickness of the prefabricated thickness and the thickness of the cast-in-situ laminated slab of the laminated slab are equal to the thickness of the originally designed cast-in-situ structural slab; recalculating and adjusting the reinforcement of the laminated slab according to the slab load and the concrete strength of the original design cast-in-place structure, and sending the adjusted laminated slab to an original design unit for auditing and obtaining the agreement; and a horizontal overhanging reinforcing steel bar is arranged at the connecting part of the prefabricated concrete assembled laminated slab and the cast-in-place concrete large cantilever structural beam and is bound and fixed with the horizontal connecting reinforcing steel bar on the top surface of the cast-in-place concrete large cantilever structural beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011570686.XA CN112647597A (en) | 2020-12-25 | 2020-12-25 | Construction method of high-altitude large-cantilever concrete beam plate structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011570686.XA CN112647597A (en) | 2020-12-25 | 2020-12-25 | Construction method of high-altitude large-cantilever concrete beam plate structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112647597A true CN112647597A (en) | 2021-04-13 |
Family
ID=75363403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011570686.XA Pending CN112647597A (en) | 2020-12-25 | 2020-12-25 | Construction method of high-altitude large-cantilever concrete beam plate structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112647597A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113605170A (en) * | 2021-06-21 | 2021-11-05 | 浙江万里建设工程有限公司 | Construction method of artistic tree root breast board |
| CN114575590A (en) * | 2022-03-17 | 2022-06-03 | 中铁五局集团第一工程有限责任公司 | High-altitude connecting beam cast-in-place construction method |
| CN114809300A (en) * | 2022-05-20 | 2022-07-29 | 中建八局第二建设有限公司 | Construction method of high-altitude multilayer large-cantilever steel reinforced concrete composite structure |
| CN114960954A (en) * | 2022-06-24 | 2022-08-30 | 中建八局第二建设有限公司 | Construction method of high-altitude over-limit cantilever shear wall |
| CN116411714A (en) * | 2023-03-31 | 2023-07-11 | 上海宝冶集团有限公司 | Construction method of large-section overrunning cantilever beam |
-
2020
- 2020-12-25 CN CN202011570686.XA patent/CN112647597A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113605170A (en) * | 2021-06-21 | 2021-11-05 | 浙江万里建设工程有限公司 | Construction method of artistic tree root breast board |
| CN114575590A (en) * | 2022-03-17 | 2022-06-03 | 中铁五局集团第一工程有限责任公司 | High-altitude connecting beam cast-in-place construction method |
| CN114809300A (en) * | 2022-05-20 | 2022-07-29 | 中建八局第二建设有限公司 | Construction method of high-altitude multilayer large-cantilever steel reinforced concrete composite structure |
| CN114960954A (en) * | 2022-06-24 | 2022-08-30 | 中建八局第二建设有限公司 | Construction method of high-altitude over-limit cantilever shear wall |
| CN116411714A (en) * | 2023-03-31 | 2023-07-11 | 上海宝冶集团有限公司 | Construction method of large-section overrunning cantilever beam |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112647597A (en) | Construction method of high-altitude large-cantilever concrete beam plate structure | |
| CN109811878A (en) | The shell integrated structure of the cast-in-place coinsiding die of assembled architecture and construction method | |
| JP3569861B2 (en) | Construction method of stairs and staircase, staircase support device, and staircase structure | |
| CN109895239B (en) | Fabricated concrete stair slow platform beam slab and construction method thereof | |
| CN214696077U (en) | High-altitude large-cantilever concrete beam plate structure | |
| CN113463653B (en) | Construction method for dismantling inner support in vertical sectional manner | |
| CN112695914B (en) | Assembly type shear wall structure system and construction method thereof | |
| CN217896916U (en) | Prefabricated bottom plate for hollow floor and hollow floor | |
| JP2706742B2 (en) | Construction method of reinforced concrete stairs, stair handrail precast concrete slab and stair step formwork used for it | |
| CN114562023A (en) | Assembly type frame connecting node, assembly type frame and assembly method | |
| CN113323215A (en) | Concrete groove type composite floor slab free of truss steel bars and construction method thereof | |
| CN113309259A (en) | Integral horizontal joint of superposed shear wall and construction method | |
| US20070079570A1 (en) | Reinforced Concrete Forming System | |
| CN112359965A (en) | Precast concrete assembled structure with rib mold structure and construction method thereof | |
| CN112695802A (en) | Optimized outlet shaft top bridge machine room structure | |
| CN216713527U (en) | Assembled plane superstructure | |
| CN215715981U (en) | Template-free and support-free assembled integral frame system for storage type logistics building | |
| CN215631895U (en) | First-floor beam structure of set-building and set-building | |
| CN115637776B (en) | Pavement sandwich structure building and construction method thereof | |
| CN215907147U (en) | Laminated slab and assembled building based on same | |
| CN212836176U (en) | Composite prefabricated floor slab with roughened surface | |
| CN113605711B (en) | Construction method of building structure | |
| JP2928002B2 (en) | Column formwork structure | |
| CN212613003U (en) | Integrally prefabricated balcony and connecting node suitable for prefabricated building | |
| CN220928370U (en) | Support-free composite floor slab |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Qingxin Inventor after: Kuangguifeng Inventor after: Kong Fanying Inventor after: Shi Xiangzhong Inventor after: Jin Zhongqiang Inventor before: Li Qingxin |
|
| CB03 | Change of inventor or designer information |