CN115478706A - Construction method for widening corridor with cantilever structure - Google Patents
Construction method for widening corridor with cantilever structure Download PDFInfo
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- CN115478706A CN115478706A CN202211080773.6A CN202211080773A CN115478706A CN 115478706 A CN115478706 A CN 115478706A CN 202211080773 A CN202211080773 A CN 202211080773A CN 115478706 A CN115478706 A CN 115478706A
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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
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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
- E04G19/00—Auxiliary treatment of forms, e.g. dismantling; Cleaning devices
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
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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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- 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
- E04G23/0266—Enlarging
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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
- E04G23/08—Wrecking of buildings
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- Civil Engineering (AREA)
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- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention provides a construction method for widening an overhanging structure corridor, which comprises the steps of construction preparation, rope saw cutting, cushion layer construction, foundation connection construction, wall column construction, beam plate connection construction, concrete pouring and the like. The invention effectively combines the newly added corridor with the original building into a whole, ensures the integrity of the reconstruction project and enhances the structural safety.
Description
Technical Field
The invention relates to the technical field of corridor widening, in particular to a construction method for widening a corridor with an overhanging structure.
Background
Through researching the development process of domestic and foreign building engineering, when the engineering construction is carried out to a certain stage, the transformation and reinforcement of the engineering structure becomes a main construction mode, along with the rapid development of urbanization in China, the building structure of an old urban area can not meet the requirements of modern life and production of people due to special history and development modes, the existing building is locally dismantled and transformed into main construction contents of the old urban area, how new and old structures are effectively connected, the method of dismantling and rebuilding is generally adopted in the past, the cost is too high, and the resource waste is very large. The method of partial splicing cannot form a whole with the original structure, and the quality of the later-period junction is more affected.
Disclosure of Invention
Aiming at the prior art, the invention provides a construction method for widening an overhanging structure corridor.
The invention provides a construction method for widening an overhanging structure corridor, which comprises the following steps:
s1, construction preparation: building a water retaining bank around the cutting area, and orderly organizing water drainage to prevent construction water from polluting the surrounding environment; according to a design drawing and field reality, technical personnel design and typeset concrete entities to be cut off and cut off the entities in blocks; according to the field layout, binding by using a crane steel wire rope, and after fixing a lifting point by using a lifting appliance, stressing the lifting appliance and stopping lifting;
s2, cutting by a wire saw: cutting redundant concrete structures through a rope saw, and transporting the concrete structures to a designated position through a crane for centralized treatment;
s3, constructing a cushion layer: backfilling and slope releasing are carried out after the foundation pit is excavated;
s4, foundation connection construction: constructing a newly added foundation of the corridor, chiseling original foundation concrete, and exposing original foundation stress steel (31599) and newly added foundation stress steel (31599) for welding;
s5, wall and column construction: 1) Drawing the distance between the stirrups on the diagonal main reinforcements of the column, moving the sleeved stirrups upwards, binding from top to bottom, vertically binding the stirrup surfaces with the main reinforcements, binding the corners of the stirrups and the intersections of the main reinforcements, and keeping the bent parts of the stirrups to be communicated and rotated at four corners of the column;
2) Erecting a shear wall template and a top plate template: firstly popping out a central line and inner and outer side lines of a template, fixing a beam side model by using split bolts, PVC sleeves, square timbers and steel pipes, fixing the template by using steel scaffold pipes, and combining the timbers for use;
s6, beam and plate connection construction: 1) Lengthening a concrete cantilever beam: chiseling an original cantilever beam stirrup protective layer, welding an original stirrup by using a U-shaped hoop, adding a plurality of reinforcing steel bars to an upper opening and a lower opening respectively to be connected with an original ring beam in a bar planting manner to form a newly-added beam, chiseling an original cantilever beam upper opening main reinforcement protective layer, and performing double-side welding with a lengthened main reinforcement;
2) Connecting floor plates: implanting a plurality of wall penetrating members 31599 at the lower opening of an upper layer (31599) of a top plate in the original masonry, anchoring the wall penetrating members 31599 into a reinforced layer of the top plate at the inner side of the wall, and anchoring the wall penetrating members 31599 into a cast-in-place plate at the outer side of the wall;
and S7, pouring concrete.
Preferably, in S1, the hoisting capacity of the hoisting equipment is considered in the typesetting process, the weight of the cutting block is calculated before typesetting, the load requirement of the hoisting equipment is met, and reasonable typesetting and blocking are carried out.
Preferably, in S2, the specific process of cutting is as follows: and starting a hydraulic motor to drive a large flywheel to drive the diamond rope to rotate and cut, wherein the pressure is controlled to be 120-140bar during cutting.
Preferably, in S5, the straight part of the stirrup end is kept parallel to the concrete surface, and the straight length is not less than 10d.
Preferably, in S5, after the main reinforcement is arranged as required, a limiting hoop is additionally arranged at the upper opening of the bottom plate of the main reinforcement to ensure the positioning of the column reinforcement, and a reinforcement positioning clamp is arranged at the upper opening of the main reinforcement to ensure the accurate position of the main reinforcement; in order to ensure the thickness of the protective layer of the main reinforcement, a plastic card is arranged on the outer side of the main reinforcement of the column, and the thickness of the plastic card is equal to that of the protective layer of the main reinforcement.
Compared with the prior art, the invention has the beneficial effects that: the invention utilizes the rope saw to cut the original windward beam, the corridor beam plate and the breast board for dismantling construction, and the original cantilever beam is reserved. After the windward beam, the corridor beam plate and the breast board are dismantled, the original cantilever beam is lengthened to the newly-added column, the original cantilever beam is used for transmitting and widening the load on the board of the corridor and then transmitting the load to the wall, the column and the foundation, and the new and old foundations, the beam and the board are effectively connected through bar planting and a method for expanding the cross section, so that the newly-added corridor and the original building are effectively combined into a whole, the integrity of a reconstruction project is ensured, and the structural safety is enhanced.
Drawings
Fig. 1 is a flow chart of a construction method for widening an overhanging structure corridor in the embodiment of the invention.
Fig. 2 is a construction diagram of a newly added foundation in the embodiment of the present invention.
FIG. 3 is a construction schematic diagram of connection of an original foundation stress steel 31599 and a newly added foundation stress steel 31599 in the embodiment of the present invention.
FIG. 4 is a schematic view of construction of a steel bar of phi 14 in an embodiment of the invention.
Fig. 5 is a construction schematic diagram of connection of an original cantilever beam upper opening main rib 9 and an extension main rib in the embodiment of the invention.
FIG. 6 is a schematic illustration of the construction of a wall penetration of embodiment of the present invention (31599).
In the figure, 1, cushion layer; 2. newly adding a foundation; 3. original foundation concrete; 4. original basic stress steel \31599; 5. newly adding basic stress steel \31599; 6. original cantilever beam; 7. phi 14 steel bars; 8. original ring beam; 9. the upper opening of the original cantilever beam is provided with a main rib; 10. lengthening a main rib; 11. wall penetrating is conducted, and 31599; 12. and (3) a cast-in-place plate.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific drawings.
Examples
A construction method for widening a corridor with an overhanging structure refers to FIG. 1, and comprises the following steps:
s1, construction preparation: the water and electricity of a construction site are ensured, and the cold water has the functions of cooling the cutting equipment and avoiding dust raising in the cutting process; building a water retaining bank around the cutting area, and orderly organizing water drainage to prevent construction water from polluting the surrounding environment; according to a design drawing and field reality, technicians design and typeset concrete entities to be cut off, and the entities are cut off in blocks; in the typesetting process, the hoisting capacity of hoisting equipment is considered, the weight of the cutting block is calculated before typesetting, the load requirement of the hoisting equipment is met, and reasonable typesetting and blocking are carried out; according to the field layout, binding by using a crane steel wire rope, and after fixing a lifting point by using a lifting appliance, stressing the lifting appliance and stopping lifting; in the embodiment, the guardrail is divided into 3m long blocks according to the current situation, the guardrail is cut from the top, and then the horizontal cutting is carried out, wherein the weight of each block is about 2 tons; corresponding supports are made before the on-site bearing wall, the breast board and the stair are dismantled, the supports are sequentially supported to the roof layer by taking the original ground bearing layer or the newly-added foundation top as a bearing stress point, the supports are tightly combined with the original structure, and the back-top support ensures safety and no fault and can be dismantled;
s2, cutting by a wire saw: cutting redundant concrete structures by a wire saw, specifically: starting a hydraulic motor, driving a large flywheel to drive a diamond rope to rotate and cut, closely observing the stability of the base in the cutting process, paying attention to observe the tightness of the rope, and controlling the pressure to be 120-140bar during cutting; after the vertical seams and the horizontal seams of the guardrails are cut off, each concrete guardrail is hung on a garage top plate 2 meters away from the outer edge of the temporary road by using a truck crane, and each concrete guardrail weighing 2 tons is separated by adopting battens and can be hoisted for the second time; after each guardrail is removed, hoisting the originally placed guardrail on the section by using an on-site tower crane, and conveying the guardrail to a specified position for centralized treatment;
s3, constructing a cushion layer 1: referring to fig. 2, after a foundation pit is excavated, gravel backfilling and slope setting are carried out;
s4, foundation connection construction: referring to fig. 2, a foundation 2 is additionally arranged in a construction corridor, the surface elevation of a foundation pit and the original building elevation are rechecked, after the newly arranged foundation 2 is accurately positioned, a water accumulation ditch is dug close to the foundation, a water accumulation well is reserved at a position of 10 meters, and water accumulation and open drainage are adopted; concealing the cushion layer 1 in time without accumulating water; when the newly added foundation 2 is poured, the uniformity and the compactness of concrete are controlled, and a flat vibrator is adopted for vibration; referring to fig. 3, chiseling original foundation concrete 3, and welding the original foundation stress steel \31599with the newly added foundation stress steel \31599, with the length of 4 10d exposed;
s5, wall and column construction: 1) Drawing lines from a concrete surface by 5cm on diagonal main reinforcements of a column by using chalk, drawing the space between the stirrups, moving the sleeved stirrups upwards, binding from top to bottom, binding the stirrup surface and the main reinforcements vertically, binding corners of the stirrups and intersection points of the main reinforcements, keeping the bent parts of the stirrups to turn at four corners of the column, keeping the straight parts of the ends of the stirrups parallel to the concrete surface, keeping the straight length not less than 10d, paying attention to the fact that the column is not twisted when binding, and dismantling and binding again part of the stirrups if finding out; after the main reinforcement is arranged according to requirements, a limiting hoop is additionally arranged at the upper opening of the bottom plate of the main reinforcement to ensure the positioning of the column reinforcement, and a reinforcement positioning clamp is arranged at the upper opening of the main reinforcement to ensure the accurate position of the main reinforcement; in order to ensure the thickness of the protective layer of the main reinforcement, a plastic card is arranged on the outer side of the main reinforcement of the column, and the thickness of the plastic card is equal to that of the protective layer of the main reinforcement;
2) Erecting a shear wall template and a top plate template: firstly, popping out a central line and inner and outer side lines of a template, fixing a beam side model by using split bolts, PVC (polyvinyl chloride) sleeves, square timbers and steel pipes, fixing the template by using a steel scaffold pipe, combining the timbers for use, ensuring the tightness of the template joint, and sticking sponge strips to the template at the original building joint to prevent slurry leakage, wherein during template installation and concrete construction, a specially-assigned person is required to observe and maintain the template and the support at any time, and the problem is found to be repaired in time, the strength of the concrete when the side model and the support are dismantled is required to reach more than 1.2Mpa, so that the surface and edges of the side model and the support are not damaged, and the dismantled template and the support are required to be stacked neatly and transported outwards in time;
s6, beam and plate connection construction: 1) Referring to fig. 4, the concrete cantilever beam is lengthened: chiseling a stirrup protective layer of the original cantilever beam, welding the original stirrup by using a U-shaped hoop, adding 3 phi 14 steel bars 7 to the upper opening and the lower opening of the original cantilever beam 6 respectively, and planting steel bars to connect with the original ring beam 8 to form a newly added beam; referring to fig. 5, chiseling a protective layer of a main rib 9 at the upper opening of the original cantilever beam, welding the protective layer with a lengthened main rib 10 5d on both sides, and anchoring the other end of the lengthened main rib 10 into the original cantilever beam 6;
2) The floor panels are connected: referring to fig. 6, implanting a plurality of wall penetrating members 31599 at the lower opening of the upper layer of the top plate in the original masonry at a spacing of 600, anchoring the wall penetrating members 31599 in the top plate reinforcing layer at the inner side of the wall, and anchoring the wall penetrating members 31599 in the cast-in-place plates 12 at the outer side of the wall;
s7, pouring concrete: chiseling and burying old concrete at the joint of the new concrete and the old concrete, and then washing the old concrete clean by water; under normal conditions (the temperature is higher than 5 ℃), a specially-assigned person is used for watering and maintaining, when the temperature is higher in summer or lower in winter, the surface of the concrete is covered by proper materials (such as gunny bags and grass bags), so that the concrete keeps the temperature and humidity conditions required by cement hardening.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and are within the scope of the present invention.
Claims (5)
1. A construction method for widening a corridor with an overhanging structure is characterized by comprising the following steps:
s1, construction preparation: building a water retaining bank around the cutting area, and orderly organizing water drainage to prevent construction water from polluting the surrounding environment; according to a design drawing and field reality, technical personnel design and typeset concrete entities to be cut off and cut off the entities in blocks; according to the field layout, binding by using a crane steel wire rope, and after fixing a lifting point by using a lifting appliance, stressing the lifting appliance and stopping lifting;
s2, cutting by a wire saw: cutting redundant concrete structures through a rope saw, and transporting the concrete structures to a designated position through a crane for centralized treatment;
s3, cushion layer construction: backfilling and slope releasing are carried out after the foundation pit is excavated;
s4, foundation connection construction: constructing a newly-added foundation of the corridor, chiseling the concrete of the original foundation, and exposing stress steel (31599) of the original foundation and stress steel (31599) of the newly-added foundation;
s5, wall and column construction: 1) Drawing the stirrup spacing on the diagonal main reinforcements of the column, moving the sleeved stirrups upwards, binding from top to bottom, binding the stirrup faces and the main reinforcements vertically, binding the stirrup corners and the main reinforcement intersections, and keeping the bent parts of the stirrups to be turned on and off at four corners on the column;
2) Erecting a shear wall template and a top plate template: firstly popping out a central line and inner and outer side lines of a template, fixing a beam side model by using split bolts, PVC sleeves, square timbers and steel pipes, fixing the template by using steel scaffold pipes, and combining the timbers for use;
s6, beam and plate connection construction: 1) Lengthening the concrete cantilever beam: chiseling an original cantilever beam stirrup protective layer, welding an original stirrup by using a U-shaped hoop, adding a plurality of reinforcing steel bars to an upper opening and a lower opening respectively to be connected with an original ring beam in a bar planting manner to form a newly-added beam, chiseling an original cantilever beam upper opening main reinforcement protective layer, and performing double-side welding with a lengthened main reinforcement;
2) The floor panels are connected: implanting a plurality of wall penetrating members 31599 at the lower opening of an upper layer (31599) of a top plate in the original masonry, anchoring the wall penetrating members 31599 into a reinforced layer of the top plate at the inner side of the wall, and anchoring the wall penetrating members 31599 into a cast-in-place plate at the outer side of the wall;
and S7, pouring concrete.
2. The construction method for widening the corridor with the cantilever structure according to claim 1, wherein in the S1, the hoisting capacity of hoisting equipment is considered in the typesetting process, the weight of the cutting blocks is calculated before typesetting, the load requirement of the hoisting equipment is met, and reasonable typesetting and blocking are carried out.
3. The method for constructing the extension of the corridor with the cantilever structure according to claim 1 or 2, wherein in the step S2, the specific process of cutting is as follows: and starting a hydraulic motor to drive a large flywheel to drive the diamond rope to rotate and cut, wherein the pressure is controlled to be 120-140bar during cutting.
4. A method of widening an overhanging structural corridor as claimed in claim 1 or claim 2, wherein in S5 the straight part of the stirrup-end is kept parallel to the concrete surface for a length of not less than 10d.
5. The method for constructing the widened corridor with the cantilever structure according to claim 1 or 2, wherein in S5, after the main reinforcement is arranged as required, a limiting hoop is additionally arranged at the upper opening of the bottom plate of the main reinforcement to ensure the positioning of the column reinforcement, and a reinforcement positioning clamp is arranged at the upper opening of the main reinforcement to ensure the accurate position of the main reinforcement; in order to ensure the thickness of the protective layer of the main reinforcement, a plastic card is arranged on the outer side of the main reinforcement of the column, and the thickness of the plastic card is equal to that of the protective layer of the main reinforcement.
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| CN202211080773.6A CN115478706A (en) | 2022-09-05 | 2022-09-05 | Construction method for widening corridor with cantilever structure |
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