CN112443083B - Construction method of cast-in-place concrete stair - Google Patents
Construction method of cast-in-place concrete stair Download PDFInfo
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- CN112443083B CN112443083B CN202011377478.8A CN202011377478A CN112443083B CN 112443083 B CN112443083 B CN 112443083B CN 202011377478 A CN202011377478 A CN 202011377478A CN 112443083 B CN112443083 B CN 112443083B
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- floor
- ladder beam
- stair
- concrete
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
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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
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
- E04G13/062—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall for stairs or steps
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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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Steps, Ramps, And Handrails (AREA)
Abstract
The invention discloses a construction method of a cast-in-place concrete stair, which comprises the following steps: 1) paving the floor, the ladder beam and the stair template, and paving reinforcing steel bars; 2) pouring concrete into the floor, the stairs, the upper end ladder beam of the floor and the starting ladder beam of the floor until the height of the concrete is 8-12 cm; 3) disassembling a side mold of the starting ladder beam of the floor close to one side of the stair, and removing floating slurry on the surface of the formed concrete and roughening the surface of the formed concrete; 4) installing a side mold of the starting ladder beam of the floor close to one side of the stair; 5) laying the previous floor, the ladder beam and the stair template, and laying reinforcing steel bars; 6) and continuously pouring the concrete. The ladder beam is poured in the upper layer and the lower layer, and a construction joint formed between two times of pouring is a horizontal construction joint, so that the structural integrity can be greatly improved, and residues can be conveniently cleaned.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a construction method of a cast-in-place concrete stair.
Background
In the multi-storey building structure, the stairs are mostly cast-in-place plate type mechanisms, and the construction of the stairs is required to be carried out synchronously with the construction of the main body structure. This inevitably leaves a construction joint, typically at about 1/3 per flight of stairs where shear is the least, perpendicular to the bottom form. In the traditional construction method, root residues are easy to be left in construction joints, and the formwork is removed when the concrete strength does not meet the standard requirement, so that the following defects exist: 1) the line shape of the joint is not straight, the garbage at the root of the construction joint cannot be eradicated, the appearance is poor if the joint is small, and the stress performance of the structure is influenced if the joint is large; 2) the reinforcing steel bars at the stair construction joints are not reserved in full length, and the structure shear resistance and the integral difference of the reinforcing steel bars are poor, so that the anti-seismic performance of the stair is poor; 3) the reinforcing steel bars are reserved in advance at the joint of the stairs, so that the reinforcing steel bars are easy to rust and inconvenient to construct; 4) the workload of chiseling concrete and cleaning garbage at joints is large, and the working efficiency is influenced; 5) the joint position of new and old concrete of the construction joint is easy to form wrong platforms, and the post-processing work is heavy.
Disclosure of Invention
The invention aims to solve the technical problem of a construction method of a cast-in-place concrete stair convenient for cleaning construction joint residues.
The technical scheme provided by the invention is a construction method of a cast-in-place concrete stair, which comprises the following steps:
1) laying the stair templates between the floor, the stair beam of the floor and the next floor, and laying reinforcing steel bars; the ladder beam comprises an upper end ladder beam and a starting ladder beam;
2) pouring concrete into the floor, the stairs between the floor and the next floor, the upper end ladder beam of the floor and the starting ladder beam of the floor, wherein the height from the concrete to the starting ladder beam of the floor is 8-12 cm;
3) disassembling a side mold of the starting ladder beam of the floor close to one side of the stair, and removing floating slurry on the surface of the formed concrete and roughening the surface of the formed concrete;
4) installing a side mold of the starting ladder beam of the floor close to one side of the stair;
5) laying a stair template between the previous floor and the previous floor, a stair beam of the previous floor and a stair template between the current floor and the previous floor, and laying reinforcing steel bars;
6) and concrete is continuously poured on the starting ladder beam of the floor, the previous floor, the stairs between the floor and the previous floor, the upper end ladder beam of the previous floor and the starting ladder beam of the previous floor, and the height from the concrete to the starting ladder beam of the previous floor is 8-12 cm.
In the technical scheme of the application, the floor is assumed to be 2 floors, the previous floor is 3 floors, and the next floor is 1 floor; if the floor is 3 floors, the previous floor is 4 floors, the next floor is 2 floors, and so on.
The ladder beam is divided into an upper end ladder beam and a starting ladder beam, the upper end ladder beam is communicated with the next floor, namely the upper end ladder beam is connected with the stairs leading to the next floor; the starting ladder beam is communicated with the upper floor, namely the starting ladder beam is connected with the stairs leading to the upper floor.
In the step 1), the length ratio of the upper end ladder beam to the starting ladder beam is 1: 1. namely, the length of each station ladder beam of the upper end ladder beam and the starting ladder beam is half of that of each station ladder beam.
In the step 1), a steel wire mesh is adopted to block the upper end ladder beam and the starting ladder beam. Because there is the difference in height between upper end ladder roof beam and the starting ladder roof beam, the steel wire net shutoff is in order to prevent that the concrete that upper end ladder roof beam was pour from flowing into starting ladder roof beam department.
The ladder beam template consists of a bottom plate and side dies connected to two sides of the bottom plate, and is divided into two parts, namely an upper ladder beam and a starting ladder beam, and the template is also divided into two parts. The template of the upper end ladder beam is composed of a bottom plate and two side modules, and the template of the starting ladder beam is also composed of a bottom plate and two side modules; the two side moulds of the upper end ladder beam are respectively connected with the floor template and the stair template leading to the next floor; the two side molds of the starting ladder beam are respectively connected with the floor mold plate and the stair mold plate leading to the previous floor.
Furthermore, the side die of the starting ladder beam close to one side of the stair is detachably connected with the stair template and movably connected with the bottom plate. This facilitates the disassembly and assembly of the sideform.
And 6), before concrete is poured, watering to wet the template and the surface of the concrete poured on the starting ladder beam of the floor.
In the invention, the starting ladder beam is poured in two layers, the first layer is only poured until the thickness of concrete is 8-12cm, and the height can protect the reinforcing steel bars at the lower part of the ladder beam. And continuously pouring the concrete on the first layer of poured concrete to the designed elevation of the drawing for the second time. Namely, the upper surface of the concrete poured for the first time is a construction joint, and the construction joint is horizontally left.
Compared with the prior art, the invention has the following advantages:
1) the ladder beam is poured in an up-down layered mode, the steel bars submerging the bottom of the ladder beam are poured firstly for the first time, and the steel bars are continuously poured to the designed elevation of the drawing for the second time. The construction joint formed between two times of pouring is a horizontal construction joint, and the structural integrity can be greatly improved.
2) Because the side forms of the ladder beam close to one side of the stair are movable and detachable, construction joint residues and construction garbage can be conveniently cleaned.
3) The construction joint is left at the ladder beam, can avoid the cut position, and does not influence the compression resistance and bending resistance of the structure.
4) Because the construction joints are arranged at the ladder beams, the stair slab ribs do not need to be reserved or overlapped, and the stair slab ribs are laid in a full-length mode after formwork support is completed.
5) The side mould can be removed and the garbage can be cleaned when the strength of the concrete reaches 1.2MPa, so that the potential safety hazard that the concrete cannot be fractured due to the fact that the mould is removed when the strength of the concrete reaches is avoided.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is another schematic structural view of the present invention;
FIG. 3 is a schematic view of a ladder beam structure;
the reference numbers in the figures are: 1. the floor; 2. the upper floor; 3. the next floor; 4. an upper end ladder beam; 5. a starting ladder beam; 6. a base plate; 7. and (4) carrying out side molding.
Detailed Description
The following specific examples further illustrate the invention but are not intended to limit the invention thereto.
As shown in fig. 1-3, the present invention comprises the steps of:
1) laying a stair template between the floor 1 and the stair beam of the floor and between the floor 1 and the next floor 3, and laying reinforcing steel bars; the ladder beam comprises an upper end ladder beam 4 and a starting ladder beam 5; the length ratio of the upper end ladder beam to the starting ladder beam is 1: 1. namely, the upper end ladder beam 4 and the starting ladder beam 5 are half the length of each of the step ladder beams. And a steel wire mesh is adopted between the upper end ladder beam 4 and the starting ladder beam 5 for plugging. Because there is the difference in height between upper end ladder roof beam 5 and the starting ladder roof beam 5, the steel wire net shutoff is in order to prevent that the concrete that upper end ladder roof beam 4 was pour from flowing into starting ladder roof beam 5 department. The ladder beam template consists of a bottom plate 6 and side dies 7 connected to two sides of the bottom plate 6, and is divided into two parts, namely an upper ladder beam 4 and a starting ladder beam 5, and the template is also divided into two parts. The template of the upper end ladder beam 4 consists of a bottom plate 6 and two side molds 7, and the template of the starting ladder beam 5 also consists of a bottom plate 6 and two side molds 7; two side molds 7 of the upper end ladder beam 4 are respectively connected with the floor template and the stair template leading to the next floor; the two side molds 7 of the starting ladder beam 5 are respectively connected with the floor mold plate and the stair mold plate leading to the previous floor. The side mold 7 of the starting ladder beam 5 close to one side of the stair is detachably connected with the stair template and movably connected with the bottom plate 6. This facilitates the disassembly and assembly of the sideform.
2) Pouring concrete into the floor 1, the stairs between the floor 1 and the next floor 3, the upper end ladder beam 4 of the floor and the starting ladder beam 5 of the floor until the height of the concrete is 8-12 cm;
3) disassembling a side mold 7 of the starting ladder beam 5 of the floor close to one side of the stair, and removing surface laitance of the formed concrete and roughening the surface laitance;
4) installing a side mold 7 of the starting ladder beam 5 of the floor close to one side of the stair;
5) laying an upper floor 2, an upper floor stair beam and a stair template between the floor and the upper floor, and laying reinforcing steel bars;
6) watering the wet template and pouring concrete on the surface of the starting ladder beam 5 of the floor, and then continuously pouring the starting ladder beam 5 of the floor, the stairs between the floor 1 and the previous floor 2, the upper end ladder beam 5 of the previous floor and the starting ladder beam 5 of the previous floor until the height of the concrete is 8-12 cm.
Claims (4)
1. A construction method of a cast-in-place concrete stair is characterized by comprising the following steps: the method comprises the following steps:
1) laying the stair templates between the floor, the stair beam of the floor and the next floor, and laying reinforcing steel bars; the ladder beam comprises an upper end ladder beam and a starting ladder beam;
2) pouring concrete into the floor, the stairs between the floor and the next floor, the upper end ladder beam of the floor and the starting ladder beam of the floor, wherein the height from the concrete to the starting ladder beam of the floor is 8-12 cm;
3) disassembling a side mold of the starting ladder beam of the floor close to one side of the stair, and removing floating slurry on the surface of the formed concrete and roughening the surface of the formed concrete;
4) installing a side mold of the starting ladder beam of the floor close to one side of the stair;
5) laying a stair template between the previous floor and the previous floor, a stair beam of the previous floor and a stair template between the current floor and the previous floor, and laying reinforcing steel bars;
6) and concrete is continuously poured on the starting ladder beam of the floor, the previous floor, the stairs between the floor and the previous floor, the upper end ladder beam of the previous floor and the starting ladder beam of the previous floor, and the height from the concrete to the starting ladder beam of the previous floor is 8-12 cm.
2. The construction method of the cast-in-place concrete stair according to claim 1, wherein the construction method comprises the following steps: in the step 1), the length ratio of the upper end ladder beam to the starting ladder beam is 1: 1.
3. the construction method of the cast-in-place concrete stair according to claim 1, wherein the construction method comprises the following steps: in the step 1), a steel wire mesh is adopted to block the upper end ladder beam and the starting ladder beam.
4. The construction method of the cast-in-place concrete stair according to claim 1, wherein the construction method comprises the following steps: step 1), the side mold of the starting ladder beam close to one side of the stair is detachably connected with the stair template and movably connected with the bottom plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011377478.8A CN112443083B (en) | 2020-11-30 | 2020-11-30 | Construction method of cast-in-place concrete stair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011377478.8A CN112443083B (en) | 2020-11-30 | 2020-11-30 | Construction method of cast-in-place concrete stair |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112443083A CN112443083A (en) | 2021-03-05 |
| CN112443083B true CN112443083B (en) | 2022-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011377478.8A Active CN112443083B (en) | 2020-11-30 | 2020-11-30 | Construction method of cast-in-place concrete stair |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321423A (en) * | 2013-07-10 | 2013-09-25 | 南通华新建工集团有限公司 | Cast-in-place concrete stair construction method |
| CN104060781A (en) * | 2014-06-27 | 2014-09-24 | 合肥建工集团有限公司 | Cast-in-situ cranked slab stair without seams at stair sections and construction method |
| CN108222505B (en) * | 2017-12-28 | 2020-04-24 | 中国建筑第八工程局有限公司 | Remaining method of stair step construction joint |
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