CN113027166B - Basement roof hoisting area reinforcing construction method under construction area limited environment - Google Patents
Basement roof hoisting area reinforcing construction method under construction area limited environment Download PDFInfo
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- CN113027166B CN113027166B CN202110356948.0A CN202110356948A CN113027166B CN 113027166 B CN113027166 B CN 113027166B CN 202110356948 A CN202110356948 A CN 202110356948A CN 113027166 B CN113027166 B CN 113027166B
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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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a basement roof hoisting area reinforcing construction method in a construction area limited environment, which comprises the following construction process flows of: (1) constructing basement structure columns in the top plate reinforcing area; (2) hoisting the reinforced area longitudinal and transverse prestress superposed T-shaped box girder in place; (3) hoisting the laminated slab in the reinforcing area in place; (4) binding reinforcing steel bar meshes in a reinforcement area; (5) reinforcing steel bars on four sides of the reinforced area are firmly connected with the reinforcing steel bars extending outwards from four sides of the basement bottom plate at the atrium; (6) pouring and maintaining concrete; (7) tensioning and anchoring unbonded prestressed tendons of the longitudinal and transverse prestressed superposed T-shaped box girder in the reinforcing area; (8) and warning signs are arranged on four sides of the reinforced area, so that the parking area of the hoisting machinery is determined. The method fully considers the requirements of complex environments on site and the bearing capacity of the top plate of the basement, effectively compares the methods of external span hoisting of the top plate of the basement, tower crane laying hoisting and the like, finally determines the scheme of hoisting on the top plate of the basement, has reasonable and effective technical scheme, and meets the requirement of the construction period.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a basement roof hoisting area reinforcing construction method in a construction area limited environment.
Background
In the steel construction hoist and mount process work progress, to hoisting each type of steel member in upper portion need the long-term berth hoist and mount machinery, when generally adopting "basement roof lower part reinforcement method" to implement, adopt full hall scaffold frame support or support column support in basement roof lower part promptly, but it not only implementation cycle is long, influences other professional constructions of basement moreover, seriously influences the whole cycle of engineering, consequently, adopts "basement roof lower part reinforcement method" can not satisfy the construction requirement. On the other hand, considering that the available space of the whole field is limited and the top plate of the basement cannot directly meet the requirement of mechanical parking bearing capacity, a more efficient and stable construction method is urgently needed.
Disclosure of Invention
The invention aims to provide a basement roof hoisting area reinforcing construction method under the limited construction area environment, and the core technical scheme is that a roof reinforcing area (hoisting machinery parking area) is arranged in the whole item 'atrium area', so that the problems in the background technology are solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a basement roof hoisting area reinforcing construction method in a construction area limited environment specifically comprises the following steps:
the construction process comprises the following steps:
a. constructing basement structure columns in the top plate reinforcing area; the top plate reinforcing area comprises a central reinforcing area and a channel reinforcing area;
when the original structural columns of the basement can also be taken into consideration for supporting the columns by the top plate in the reinforcing area, redundant steel supporting columns do not need to be rearranged;
when the original structural column cannot meet the subsequent hoisting mechanical load through calculation, a steel support column needs to be additionally arranged;
the steel support columns in the top plate reinforcing area are of steel-concrete stiffness structures, the tops of outer steel columns of the steel-concrete stiffness structure columns are provided with notches for butting with the prefabricated prestressed superposed T-shaped box girders, and the notches are used for controlling the hoisting elevation requirements of subsequent prestressed superposed T-shaped box girders;
the strength of the concrete cast in situ of the steel support columns in the top plate reinforcing area is at least one grade higher than that of the columns in the non-reinforcing area, and the concrete is cast until the concrete is flush with the bottom of the notches at the tops of the steel-concrete stiff structural columns or 30mm lower than the bottom of the notches at the tops of the steel-concrete stiff structural columns;
b. hoisting the top plate reinforcing area in place by overlapping the T-shaped box girder in a longitudinal and transverse prestress manner; the hoisting position of the longitudinal and transverse prestress superposed T-shaped box girder in the reinforced area is combined with the pouring thickness of the post-cast concrete to be arranged in advance to be in place for elevation, and the top surface of the post-cast concrete after construction is ensured to be flush with the top surface of the basement bottom plate with the periphery being constructed;
before the prestressed laminated T-shaped box girder is hoisted in place, strictly rechecking the elevation of the bottom of the notch at the top of the steel-concrete stiffness structural column, determining the error and springing an elevation position line at the side edge of the steel-concrete stiffness structural column, wherein the elevation of the bottom of the notch is a negative error, and is only allowed to be lower than the designed elevation, so that the prestressed laminated T-shaped box girder is accurately hoisted in place;
when the prestressed laminated T-shaped box girder is in butt joint with a side column of a reinforcing area, when the outward extending steel bars of a conventional girder body are anchored into a column body, the outward extending unbonded prestressed bars of the prestressed laminated T-shaped box girder are gradually extended into the notches on the other side of the top of the steel-concrete rigid structure column, and the lengths meeting the tensioning requirement are exposed, so that the subsequent prestressed bars can be conveniently tensioned and anchored;
c. hoisting the laminated slab in the reinforcing area in place; after the longitudinal and transverse prestress superposed T-shaped box girders in the reinforcing area are hoisted in place, the vertical support is adjusted, and then the superposed slabs in the reinforcing area are hoisted;
the thickness of the floor slab in the reinforced area is 2.5 times of that of the floor slab in the non-reinforced area, so that the top elevation is flush with that of the top slab of the basement in the non-reinforced area, the bottom elevation is a fixed value, and the prefabricated thickness of the laminated slab in the reinforced area and the thickness of post-cast concrete are reasonably determined in the middle of the laminated slab;
in the process of hoisting and positioning the laminated slab in the reinforcing area, the ends of the overhanging steel bars of the laminated slab are provided with anchoring plates one by one, and the anchoring plates stretch into the upper superposed area of the prestressed superposed T-shaped box girder;
after the laminated slab in the reinforcing area is hoisted in place, the positions of the prestressed laminated T-shaped box girder and the laminated slab are integrally checked, and errors are generated and adjusted in time;
d. binding reinforcing steel bar meshes in a reinforcement area; after the laminated slab in the reinforcing area is hoisted in place, binding the integral steel bar net piece on the upper part of the laminated slab, and encrypting the steel bar net piece at the subsequent long-term stop position of the hoisting machine;
e. reinforcing steel bars on four sides of the reinforced area are firmly connected with the reinforcing steel bars extending outwards from four sides of the basement bottom plate at the atrium; when the height difference exceeds 50mm, adopting oblique shear-resistant steel bars to weld and tie one by one, and arranging reinforcing negative bars at the reinforcing bar net sheets and the overhanging steel bars at the edge of the basement top plate in the non-reinforced area;
f. pouring and maintaining concrete; after the connection of the steel bars is finished, performing secondary rechecking of the whole process, and then performing concrete pouring construction and reinforced maintenance;
g. tensioning and anchoring unbonded prestressed tendons of the longitudinal and transverse prestressed superposed T-shaped box girder in the reinforcing area;
in order to facilitate the prestressed tendon tensioning and anchoring construction, the longitudinal and transverse prestressed superposed T-shaped box girder unbonded prestressed tendon tensioning and anchoring positions in the reinforcing area are arranged in the left and right web plates and the bottom plate of the box girder, and the longitudinal and transverse prestressed superposed T-shaped box girder unbonded prestressed tendon tensioning and anchoring work is started after the concrete pouring strength reaches the design strength;
h. warning signs are arranged on four sides of the reinforcing area, and a mechanical parking area is determined; because the basement top plate can not bear the load of hoisting machinery, in order to ensure the subsequent construction safety, the construction of the basement top plate in the reinforced area is finished, and warning signs are arranged on four sides of the reinforced area or warning protective railings are temporarily arranged before the mechanical entering hoisting construction, so that the cross-border hoisting construction can not be carried out;
four sides of the reinforced area are provided with warning signs or are temporarily distributed with warning protective railings, and each side is at least 1000mm away from the edge of the reinforced area, and a safety distance is reserved.
The invention has the technical effects and advantages that:
through the steel support post that sets up in the below in roof reinforcement district, and the prestressing force coincide T type case roof beam of installation above it, then carry out the superimposed sheet hoist and mount, and consolidate through the reinforcing bar net piece ligature, concrete placement, prestressing tendons stretch-draw, the anchor back carries out at last, and place the warning and mark, make things convenient for machinery airport hoist and mount construction, not only need not to place a large amount of hands foot rests, lead to the space to occupy, and the top can satisfy hoist and mount machinery through consolidating and construct, work efficiency is higher.
Drawings
FIG. 1 is a layout view of a reinforcing area of a top plate of a basement in the embodiment;
FIG. 2 is a process flow diagram of the present embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 2 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1-2, the invention provides a basement roof lifting area reinforcing construction method under a construction area limited environment, which is characterized by comprising the following steps:
the construction process comprises the following steps:
a. and (5) constructing basement structure columns in the top plate reinforcing area. The top plate reinforcing area comprises a central reinforcing area and a channel reinforcing area, the basement structure column in the design drawing can give consideration to the top plate supporting column body in the reinforcing area, namely, the original basement structure column is taken into consideration comprehensively when the top plate reinforcing area range is selected, and redundant supporting columns are not required to be rearranged. If the original design structure column can not satisfy the subsequent hoisting mechanical load through calculation, the steel support column can be additionally arranged. The basement structure column in the top plate reinforcing area is of a steel-concrete stiffness structure, the outer steel column of the steel-concrete stiffness structure column needs to be in butt joint with the prefabricated prestress superposed T-shaped box girder when being processed in a factory, so notches with the same shape and size as the butted prefabricated prestress superposed T-shaped box girder need to be reserved at the top of the outer steel column of the steel-concrete stiffness structure column, and the notches arranged at the top of the steel-concrete stiffness structure column can control the hoisting elevation requirement of the subsequent prestress superposed T-shaped box girder. The strength of the concrete cast in situ of the basement structure column in the top plate reinforcing area is at least one grade higher than that of the column body in the non-reinforcing area, and the concrete is cast to be flush with or 30mm lower than the bottom of the notch in the top of the steel-concrete stiff structure column, so that the stability of the steel-concrete stiff structure column after installation is ensured.
b. And (5) hoisting the reinforced area in place by overlapping the T-shaped box girder with longitudinal and transverse prestress. The hoisting position of the longitudinal and transverse prestress superposed T-shaped box girder in the reinforced area is fully combined with the pouring thickness of the post-cast concrete, and the in-place elevation is arranged in advance, so that the top surface of the post-cast concrete after construction is flush with the top surface of the basement bottom plate with the periphery completely constructed. Before the prestressed laminated T-shaped box girder is hoisted in place, strictly rechecking the elevation of the notch bottom at the top of the steel-concrete stiffness structural column, determining the error amount, and bouncing an elevation position line at the side edge of the steel-concrete stiffness structural column, wherein the elevation of the notch bottom must be a negative error, namely the elevation of the notch bottom is only allowed to be lower than the designed elevation, otherwise, the hoisting of the prestressed laminated T-shaped box girder is influenced to be accurately in place. When the prestressed laminated T-shaped box girder is in butt joint with a side column of a reinforcing area, when the outward extending steel bars of a conventional girder body are anchored into a column body, the outward extending unbonded prestressed bars of the prestressed laminated T-shaped box girder are required to be gradually extended into the notches on the other side of the top of the steel-concrete rigid structure column, and the lengths meeting the tensioning requirements are exposed, so that the subsequent prestressed bars can be conveniently tensioned and anchored.
c. And hoisting the laminated slab in the reinforcing area in place. And after the vertical support is adjusted, the reinforced area laminated slab can be hoisted. The scheme requires that reinforced area floor thickness is 2.5 times of non-reinforced area floor thickness, and consequently the determination of reinforced area superimposed sheet hoist and mount bottom elevation will satisfy post-cast concrete's design thickness requirement, and top elevation flushes with non-reinforced area basement roof top elevation promptly, and bottom elevation is the fixed value, and the middle part will rationally confirm reinforced area superimposed sheet's prefabricated thickness and post-cast concrete thickness. In the process of hoisting the laminated slab in the reinforcing area in place, the ends of the overhanging reinforcing steel bars of the laminated slab are provided with anchoring plates one by one, and the anchoring plates stretch into the upper laminated area of the prestressed laminated T-shaped box girder. And after the laminated slab in the reinforcing area is hoisted in place, the positions of the prestress laminated T-shaped box girder and the laminated slab are integrally checked, and the prestressed laminated T-shaped box girder and the laminated slab are timely adjusted after errors are generated.
d. And (5) binding reinforcing mesh sheets in the reinforced area. After the laminated slab in the reinforcing area is hoisted in place, the integral steel bar net piece on the upper part of the laminated slab is bound, and the steel bar net piece is properly encrypted at the position of the subsequent long-term stop of the hoisting machine.
e. Reinforcing area four sides reinforcing bar and zhongting department basement bottom plate four sides overhanging reinforcing bar firm in connection. The pouring thickness of the top plate of the basement in the reinforced area is larger than that of the top plate of the peripheral basement which is constructed, when reinforcing regional four-side reinforcing steel bars are connected with the four-side overhanging reinforcing steel bars of the bottom plate of the basement in the atrium, if height difference exceeds 50mm, oblique shear-resistant reinforcing steel bars are adopted to weld and tie one by one, and reinforcing negative bars are arranged at the edge overhanging reinforcing steel bars of the mesh of the reinforcing steel bars and the top plate of the basement in the non-reinforced area.
f. And pouring and maintaining concrete. After the steel bars are connected, performing secondary rechecking of the whole process, and performing post-cast concrete construction and reinforced maintenance.
g. And tensioning and anchoring the unbonded prestressed tendons of the longitudinal and transverse prestressed superposed T-shaped box girder in the reinforced area. In order to facilitate the prestressed tendon tensioning and anchoring construction, the longitudinal and transverse prestressed superposed T-shaped box girder unbonded prestressed tendons in a reinforcing area are tensioned, anchoring positions are arranged in a left web plate, a right web plate and a bottom plate of the box girder, the longitudinal and transverse prestressed superposed T-shaped box girder unbonded prestressed tendon tensioning and anchoring work is started after the concrete pouring strength reaches the design strength, and the prestressed tensioning adopts a scheme of tensioning from inside to outside, longitudinal and transverse and symmetrical.
h. And warning signs are arranged on four sides of the reinforced area, so that the parking area of the hoisting machinery is determined. Because the basement roof can't bear the hoist and mount mechanical load, in order to guarantee follow-up construction safety, accomplish at the construction of reinforcement district basement roof to before the machinery enters the field hoist and mount construction, set up warning sign or lay warning nature guard rail temporarily at reinforcement district four sides, can not cross border hoist and mount construction. The four sides of the reinforced area are provided with warning signs or are temporarily distributed with warning protective railings, the distance between each side of each warning protective railing and the edge of the reinforced area is at least 1000mm, and a safety distance is reserved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (1)
1. A basement roof hoisting area reinforcing construction method under a construction area limited environment is characterized by comprising the following steps:
the construction process comprises the following steps:
a. constructing basement structure columns in the top plate reinforcing area; the top plate reinforcing area comprises a central part reinforcing area and a channel reinforcing area;
when the original structural columns of the basement can also be taken into consideration for supporting the columns by the top plate in the reinforcing area, redundant steel supporting columns do not need to be rearranged;
when the original structural column cannot meet the subsequent hoisting mechanical load through calculation, a steel support column needs to be additionally arranged;
the steel support columns in the top plate reinforcing area are of steel-concrete stiffness structures, the tops of outer steel columns of the steel-concrete stiffness structure columns are provided with notches for butting with the prefabricated prestressed superposed T-shaped box girders, and the notches are used for controlling the hoisting elevation requirements of subsequent prestressed superposed T-shaped box girders;
the strength of the concrete cast in situ of the steel support columns in the top plate reinforcing area is at least one grade higher than that of the columns in the non-reinforcing area, and the concrete is cast until the concrete is flush with the bottom of the notches at the tops of the steel-concrete stiff structural columns or 30mm lower than the bottom of the notches at the tops of the steel-concrete stiff structural columns;
b. hoisting the top plate reinforcing area in place by overlapping the T-shaped box girder in a longitudinal and transverse prestress manner; the hoisting position of the longitudinal and transverse prestress superposed T-shaped box girder in the reinforced area is combined with the pouring thickness of the post-cast concrete to be arranged in advance to be in place for elevation, and the top surface of the post-cast concrete after construction is ensured to be flush with the top surface of the basement bottom plate with the periphery being constructed;
before the prestressed laminated T-shaped box girder is hoisted in place, strictly rechecking the elevation of the bottom of the notch at the top of the steel-concrete stiffness structural column, determining the error and springing an elevation position line at the side edge of the steel-concrete stiffness structural column, wherein the elevation of the bottom of the notch is a negative error, and is only allowed to be lower than the designed elevation, so that the prestressed laminated T-shaped box girder is accurately hoisted in place;
when the prestressed laminated T-shaped box girder is in butt joint with a side column of a reinforcing area, when the conventional beam body overhanging steel bar is anchored into a column body, the unbounded prestressed steel bars overhanging the prestressed laminated T-shaped box girder are gradually stretched into the other side notch of the top of the steel-concrete rigid structure column, and the length meeting the stretching requirement is exposed, so that the subsequent prestressed steel bars can be conveniently stretched and anchored;
c. hoisting the laminated slab in the reinforcing area in place; after the longitudinal and transverse prestress superposed T-shaped box girders in the reinforcing area are hoisted in place, the vertical support is adjusted, and then the superposed slab in the reinforcing area is hoisted;
the thickness of the floor slab in the reinforced area is 2.5 times of that of the floor slab in the non-reinforced area, so that the top elevation is flush with that of the top slab of the basement in the non-reinforced area, the bottom elevation is a fixed value, and the prefabricated thickness of the laminated slab in the reinforced area and the thickness of post-cast concrete are determined in the middle;
in the process of hoisting and positioning the laminated slab in the reinforcing area, the ends of the overhanging reinforcing steel bars of the laminated slab are provided with anchoring plates one by one and extend into the upper laminated area of the prestressed laminated T-shaped box girder;
after the laminated slab in the reinforcing area is hoisted in place, the positions of the prestress laminated T-shaped box girder and the laminated slab are integrally checked, and errors are generated to adjust in time;
d. binding reinforcing steel bar meshes in a reinforcement area; after the laminated slab in the reinforcing area is hoisted in place, binding the integral steel bar net piece on the upper part of the laminated slab, and encrypting the steel bar net piece at the subsequent long-term stop position of the hoisting machine;
e. reinforcing steel bars on four sides of the reinforced area are firmly connected with the reinforcing steel bars extending outwards from four sides of the basement bottom plate at the atrium; when the height difference exceeds 50mm, adopting oblique shear-resistant steel bars to weld and tie one by one, and arranging reinforcing negative bars at the reinforcing bar net sheets and the overhanging steel bars at the edge of the basement top plate in the non-reinforced area;
f. pouring and maintaining concrete; after the connection of the steel bars is finished, performing secondary rechecking of the whole process, and then performing concrete pouring construction and reinforced maintenance;
g. tensioning and anchoring unbonded prestressed tendons of the longitudinal and transverse prestressed superposed T-shaped box girder in the reinforcing area;
in order to facilitate the prestressed tendon tensioning and anchoring construction, the longitudinal and transverse prestressed superposed T-shaped box girder unbonded prestressed tendon tensioning and anchoring positions in the reinforcing area are arranged in the left and right web plates and the bottom plate of the box girder, and the longitudinal and transverse prestressed superposed T-shaped box girder unbonded prestressed tendon tensioning and anchoring work is started after the concrete pouring strength reaches the design strength;
h. warning signs are arranged on four sides of the reinforcing area, and a mechanical parking area is determined; because the basement top plate can not bear the load of hoisting machinery, in order to ensure the subsequent construction safety, the construction of the basement top plate in the reinforced area is finished, and warning signs are arranged on four sides of the reinforced area or warning protective railings are temporarily arranged before the mechanical entering hoisting construction, so that the cross-border hoisting construction can not be carried out;
the four sides of the reinforced area are provided with warning signs or are temporarily distributed with warning protective railings, the distance between each side of each warning protective railing and the edge of the reinforced area is at least 1000mm, and a safety distance is reserved.
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| CN105401741A (en) * | 2015-11-24 | 2016-03-16 | 中建钢构有限公司 | Basement roof reinforcement construction device and construction method thereof |
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2021
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| CN105401741A (en) * | 2015-11-24 | 2016-03-16 | 中建钢构有限公司 | Basement roof reinforcement construction device and construction method thereof |
| CN109440922A (en) * | 2018-12-26 | 2019-03-08 | 上海建工七建集团有限公司 | Strenthening member and its application construction method for basement structure |
| CN110725562A (en) * | 2019-10-24 | 2020-01-24 | 杭州市建筑设计研究院有限公司 | Floor separation reinforcing method suitable for reinforcing large-load data room |
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