CN111321834A - Construction method for accurately controlling thickness of concrete cast-in-place floor - Google Patents
Construction method for accurately controlling thickness of concrete cast-in-place floor Download PDFInfo
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- CN111321834A CN111321834A CN202010163832.0A CN202010163832A CN111321834A CN 111321834 A CN111321834 A CN 111321834A CN 202010163832 A CN202010163832 A CN 202010163832A CN 111321834 A CN111321834 A CN 111321834A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
-
- 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
- E04G21/10—Devices for levelling, e.g. templates or boards
Abstract
The invention relates to a construction method for accurately controlling the thickness of a concrete cast-in-place floor slab, which comprises the following steps: erecting an inner bent support for a to-be-constructed cast floor slab, and performing lofting rechecking and correction on the inner bent support elevation through measurement and calculation; laying floor slab reinforcing steel bars on the beam slab template, binding the reinforcing steel bars, and fixedly arranging a control block; pouring concrete, wherein the concrete pouring thickness is determined according to the height of the control block in the concrete pouring process; using the thickness of the adjusting floor slab to control the insertion of the steel drill into the poured concrete to adjust the paving and pouring thickness of the concrete; after the pouring is finished, a scraping ruler is used for scraping and smoothing according to the concrete precast block, and the concrete pouring is finished; and curing the concrete after the extreme difference and elevation retest. The construction method is simple and applicable to operation, and avoids the problems of quality hidden danger and the like caused by inaccurate floor thickness control. According to the construction method, refined control is performed before the concrete floor is poured, in the pouring process and after the concrete is poured and before initial setting of the concrete, and the thickness and the flatness of the floor are guaranteed to meet the requirements of specifications and design.
Description
Technical Field
The invention relates to a construction method, in particular to a construction method for accurately controlling the thickness of a concrete cast-in-place floor slab, and belongs to the technical field of building construction.
Background
Along with the increasing economic growth of China, the living conditions of the China are continuously improved, the requirements on the living space are continuously improved, and the house is not only used as a residence, but also becomes a spiritual trusting. The interest of small owners on the quality of houses is increasingly strengthened, so that the quality of a cast-in-place concrete structure needs to be improved, and the floor slab plays an extremely important role as a partition member of a vertical space, not only in the aspect of structural stress, but also in the aspect of use function, and the quality of the floor slab is the important factor of 'head-up visibility'.
In the high-rise residential building engineering, the cast-in-place reinforced concrete structure floor slab is widely applied, and the control of the thickness of the construction plate is a difficult problem which puzzles the construction personnel for a long time. As is known, the exceeding and the reduction of the thickness of the floor slab can cause a series of problems of increased central deflection, increased self-weight of the structure, insufficient bearing capacity of the structure, cracking of the floor slab and the like, thereby not only influencing the later construction quality and efficiency, but also reducing the reputation of enterprises.
At present, the most common construction site is still the traditional method for controlling the floor elevation to reversely control the thickness of the floor according to '50' line control, namely, the floor elevation is vertically transmitted through a height marking line, 50 lines are marked on the longitudinal ribs of the floor column, after the formwork is erected, the height marking lines of the longitudinal ribs of the corner columns of each plate are connected, and a pull-through line is used for rechecking the horizontal range difference and the mid-span arching height of the floor. The method belongs to a passive control method, is convenient to operate and is easy to master. However, the column longitudinal bars cannot be kept still, and the middle of the drawn white line will generate a certain deflection and sink, so the effectiveness of controlling the thickness of the floor slab is not ideal, and the floor flatness is poor. Therefore, what method is adopted to solve the problems that the cast-in-place floor slab structure of various industrial and civil buildings in the building engineering, particularly large bay and high-rise houses are difficult to control the flatness of the concrete slab thickness and the like is a key problem to be solved in the construction.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a construction method for accurately controlling the thickness of a concrete cast-in-place floor slab. Actual measurement results show that the qualified rate of the thickness of the floor reaches 100%, and meanwhile, the qualified rate of the flatness of the floor is improved and far exceeds the quality target of a project.
In order to solve the technical problems, the invention provides a construction method for accurately controlling the thickness of a concrete cast-in-place floor slab, which comprises the following steps:
(1) erecting an inner bent frame support on a to-be-constructed cast floor slab, and installing a beam slab template according to construction design requirements;
(2) performing lofting rechecking and correction on the support elevation of the inner bent frame through measurement and calculation;
(3) laying floor slab reinforcing steel bars on the beam slab template, and binding and fixing the reinforcing steel bars; after finishing the binding of the floor slab reinforcing steel bars, carrying out control block plane arrangement on the periphery of the bound and fixed reinforcing steel bars according to the design specification of construction organization;
(4) pouring concrete, wherein the concrete pouring thickness is determined according to the height of the control block in the concrete pouring process;
(5) the method comprises the steps of controlling a steel chisel to be inserted into poured concrete by adjusting the thickness of a floor slab, determining the pouring thickness of the concrete by matching with a control block, and adjusting the paving and pouring thickness of the concrete according to design requirements;
(6) after the pouring is finished, a scraping ruler is used for scraping and smoothing according to the concrete precast block, and the concrete pouring is finished;
(7) before the initial setting of the concrete, the laser planometer and the guiding ruler are used for retesting the extreme difference and the elevation of the top plate under the floor, the formwork and the elevation of the formwork are adjusted, and the concrete is cured after the retesting of the extreme difference and the elevation is finished.
According to the construction method for accurately controlling the thickness of the concrete cast-in-place floor slab, when the top plate range and the elevation are rechecked in the step 7, the elevation deviation of the template is more than +5mm, and the top plate range is more than 15mm, the support die frame and the elevation of the template must be adjusted.
The technical scheme of the invention is further defined as follows: according to the construction method for accurately controlling the thickness of the concrete cast-in-place floor slab, the control block is a concave-convex cross-shaped concrete block prefabricated by fine aggregate concrete, and the height of the control block is the designed thickness of the cast-in-place floor slab.
According to the construction method for accurately controlling the thickness of the concrete cast-in-place floor slab, the internal corners of the control blocks are fixed and limited by nails and beam slab templates; the control blocks are arranged on the beam plate template in a plum blossom shape, and the arrangement distance of the control blocks in a single row is smaller than 2 m.
According to the construction method for accurately controlling the thickness of the concrete cast-in-place floor slab, the adjustable floor slab thickness control steel chisel mainly comprises a steel chisel, lug clamps and a scale, the lug clamps comprise sleeves, stop levers and butterfly-shaped clamp wires, the stop levers are symmetrically arranged on two sides of the sleeves, screw holes are formed in the sleeves, and the butterfly-shaped clamp wires are arranged in the screw holes; the scale is arranged on a drill rod of the drill rod, and the tip of the drill rod is inserted into the sleeve of the lug clamp and is locked and adjusted by the butterfly-shaped clamp wire.
According to the construction method for accurately controlling the thickness of the concrete cast-in-place floor slab, the stop levers on two sides of the sleeve are symmetrically arranged, and the lengths of two ends of each stop lever are larger than the maximum gap of the floor slab bound with the steel bars.
Furthermore, in the construction method for accurately controlling the thickness of the concrete cast-in-place floor slab, the control block is prefabricated by fine aggregate concrete before the concrete floor slab is poured, the matching grade of the concrete is at least higher than the designed strength of the cast-in-place floor slab, and the control block is watered, moistened and dried before use.
According to the construction method, quality control is integrated into the compact construction period requirement, floor thickness control is integrated into the early construction process, the control block is added before pouring and tamping, and the floor elevation is controlled by the aid of the adjustable floor thickness control steel rods in the pouring and tamping process, so that the accuracy of final floating of the concrete floor is improved, the board surface finishing time is greatly shortened, and the influence of labor cost and worker process level on the floor thickness and the board surface flatness is reduced. The construction method of the scheme can customize the concrete prefabricated control blocks in batches during construction, the thickness of the floor slab can be adjusted to control the drill steel to be obtained in a construction site, the manufacturing is simple and convenient, the concrete prefabricated control blocks can be repeatedly used for many times, and the cost is effectively controlled. Repeated, standard layer step up, the product is little more, and whole high-rise building's floor thickness quality can effectively be ensured, also can furthest reduce the later stage repair cost that consequences such as the floor fracture caused because the technology is improper cause.
The invention has the beneficial effects that: the construction method is simple and applicable to operation, and avoids the problems of quality hidden danger and the like caused by inaccurate floor thickness control. According to the construction method, refined control is performed before the concrete floor is poured, in the pouring process and after the concrete is poured and before initial setting, the thickness flatness of the floor is guaranteed to meet the specification and design requirements, and the qualified rate of the plate thickness reaches 100%. The tools such as the concrete precast block, the control drill rod for adjusting the thickness of the floor slab and the like adopted in the construction process have the advantages of simple operation, low cost, safety and reliability, economy and practicality, and can be generally popularized and applied. Compared with the traditional process, the construction method ensures the design requirement of the structure, reduces the concrete waste, and is energy-saving and environment-friendly.
Drawings
FIG. 1 is a flow chart of the wall system construction process of the present invention.
FIG. 2 is a block diagram of the present invention.
Fig. 3 is a schematic structural view of the floor thickness control steel rod of the invention.
Fig. 4 is a schematic view of the structure of the ear clip in fig. 3.
Detailed Description
Example 1
The embodiment provides a construction method for accurately controlling the thickness of a concrete cast-in-place floor slab, which comprises the following steps: erecting an inner bent frame support on a to-be-constructed cast floor slab, and installing a beam slab template according to construction design requirements; performing lofting rechecking and correction on the support elevation of the inner bent frame through measurement and calculation; laying floor slab reinforcing steel bars on the beam slab template, and binding and fixing the reinforcing steel bars; after finishing the binding of the floor slab reinforcing steel bars, carrying out control block plane arrangement on the periphery of the bound and fixed reinforcing steel bars according to the design specification of construction organization; pouring concrete, wherein the concrete pouring thickness is determined according to the height of the control block in the concrete pouring process; the method comprises the steps of controlling a steel chisel to be inserted into poured concrete by adjusting the thickness of a floor slab, determining the pouring thickness of the concrete by matching with a control block, and adjusting the paving and pouring thickness of the concrete according to design requirements; after the pouring is finished, a scraping ruler is used for scraping and smoothing according to the concrete precast block, and the concrete pouring is finished; before the initial setting of the concrete, the laser planometer and the guiding ruler are used for retesting the extreme difference and the elevation of the top plate under the floor, the formwork and the elevation of the formwork are adjusted, and the concrete is cured after the retesting of the extreme difference and the elevation is finished.
The control block of the embodiment adopts a concave-convex cross-shaped concrete block prefabricated by fine aggregate concrete, the height of the control block is the designed thickness of a cast-in-place floor slab, and the internal corner of the control block is fixed and limited by a nail and a beam slab template; the control blocks are arranged on the beam plate template in a plum blossom shape, and the arrangement distance of the single-row control blocks is less than 2 m. The control block is prefabricated by fine stone concrete before the concrete floor slab is poured, the matching grade of the concrete is higher than the designed strength of the cast-in-place floor slab at least by the grade, and the control block is watered, moistened and dried in the sun before use. The adjustable floor thickness control steel chisel mainly comprises three parts of a steel chisel 1, an ear-shaped fixture 2 and a scale 3, as shown in fig. 3 and 4, the ear-shaped fixture 2 comprises a sleeve 21, a stop lever 22 and butterfly-shaped clamp wires 23, the stop lever is symmetrically arranged at two sides of the sleeve, the sleeve is provided with screw holes, and the butterfly-shaped clamp wires are arranged in the screw holes; the scale is arranged on a drill rod of the drill rod, and the tip of the drill rod is inserted by a sleeve with an ear clamp and is locked and adjusted by a butterfly-shaped clamp wire. The stop levers on both sides of the sleeve are symmetrically arranged, and the length of the two ends of the stop lever is larger than the maximum clearance of floor slab reinforcement.
Before the concrete floor slab is poured, a concave-convex cross-shaped control block is prefabricated by fine aggregate concrete with a higher strength grade, as shown in figure 2, the width b and the length a of the flange are respectively 50mm and 25mm, and the height h of the control block is the designed thickness of the cast-in-place floor slab. The internal corner of the control block is fixed and limited by a nail and a template and is arranged in a plum blossom shape; the thickness of the floor can be adjusted to control the vertical penetration of the steel rod into the concrete and adjust the paving and grouting thickness of the concrete. The tool type floor thickness control mode can adjust and control the distance and the area at will, can adjust the penetration length of the front section at will, can meet the requirement of controlling the thickness of all cast-in-place structural plates in the building construction, and has strong applicability and popularization.
In this embodiment, the use of the concrete precast control block: the concrete floor is prefabricated by fine aggregate concrete before pouring, and the mixing proportion of the concrete floor is properly higher than the design strength of a cast-in-situ floor. If the floor slab design strength is C30, the strength grade of the control block is C35. Before use, the control blocks are watered, moistened and dried in the sun, and after the floor slab reinforcing steel bars are bound, the control block plane layout is set according to the construction organization design. The internal corner of the control block is fixed and limited by nails and the template. The control blocks are arranged in a plum blossom shape, and the distance between the control blocks arranged in a single row is within 2 m. In the key position, namely the central area of the floor slab, the arrangement distance of the control blocks must be met, and the control requirement of the 2m long scraping rule on the leveling of the poured concrete is guaranteed to be met. The use of adjustable floor thickness control drill rod: before the floor slab concrete is poured, the fixture is adjusted according to the designed thickness of the floor slab, the penetration length of the front end of the steel chisel is further adjusted, in the process of pouring the floor slab, the steel chisel is controlled to vertically penetrate into the concrete through adjusting the thickness of the floor slab, and the steel chisel is matched with the concrete prefabricated control block for use, so that the paving and pouring thickness of the concrete is adjusted. The tool type floor thickness control mode can adjust and control the distance and the area at will, and is particularly suitable for floor thickness control of large bay and frame structures. And (3) rechecking the range and elevation of the top plate: in the concrete pouring process, because the traditional distributing machine is easy to shake, constructors walk and concrete load influences, a formwork supporting system generates certain deformation, and in order to ensure the concrete pouring quality, professionals are required to perform secondary formwork correction before concrete is initially set. After concrete pouring is finished, a laser swinger and a guiding ruler are used immediately below a floor to recheck the polar difference and the elevation of a top plate, and a supporting die frame and the elevation of a template are required to be adjusted when the elevation deviation of the template is larger than +5mm and the polar difference of the top plate is larger than 15 mm.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A construction method for accurately controlling the thickness of a concrete cast-in-place floor slab is characterized by comprising the following steps:
(1) erecting an inner bent frame support on a to-be-constructed cast floor slab, and installing a beam slab template according to construction design requirements;
(2) performing lofting rechecking and correction on the support elevation of the inner bent frame through measurement and calculation;
(3) laying floor slab reinforcing steel bars on the beam slab template, and binding and fixing the reinforcing steel bars; after finishing the binding of the floor slab reinforcing steel bars, carrying out control block plane arrangement on the periphery of the bound and fixed reinforcing steel bars according to the design specification of construction organization;
(4) pouring concrete, wherein the concrete pouring thickness is determined according to the height of the control block in the concrete pouring process;
(5) the method comprises the steps of controlling a steel chisel to be inserted into poured concrete by adjusting the thickness of a floor slab, determining the pouring thickness of the concrete by matching with a control block, and adjusting the paving and pouring thickness of the concrete according to design requirements;
(6) after the pouring is finished, a scraping ruler is used for scraping and smoothing according to the concrete precast block, and the concrete pouring is finished;
(7) before the initial setting of the concrete, the laser planometer and the guiding ruler are used for retesting the extreme difference and the elevation of the top plate under the floor, the formwork and the elevation of the formwork are adjusted, and the concrete is cured after the retesting of the extreme difference and the elevation is finished.
2. The construction method for accurately controlling the thickness of the concrete cast-in-place floor slab as claimed in claim 1, wherein: the control block is a concave-convex cross-shaped concrete block prefabricated by fine aggregate concrete, and the height of the control block is the designed thickness of a cast-in-place floor slab.
3. The construction method for accurately controlling the thickness of the concrete cast-in-place floor slab as claimed in claim 2, wherein: the internal corners of the control blocks are fixed and limited by nails and beam slab templates; the control blocks are arranged on the beam plate template in a plum blossom shape, and the arrangement distance of the control blocks in a single row is smaller than 2 m.
4. The construction method for accurately controlling the thickness of the concrete cast-in-place floor slab as claimed in claim 1, wherein: the adjustable floor thickness control drill rod mainly comprises a drill rod, lug clamps and a scale, wherein each lug clamp consists of a sleeve, stop rods and butterfly-shaped clamping threads; the scale is arranged on a drill rod of the drill rod, and the tip of the drill rod is inserted into the sleeve of the lug clamp and is locked and adjusted by the butterfly-shaped clamp wire.
5. The construction method for accurately controlling the thickness of the concrete cast-in-place floor slab as claimed in claim 4, wherein: the stop levers on both sides of the sleeve are symmetrically arranged, and the lengths of both ends of the stop levers are larger than the maximum clearance of floor slab reinforcement.
6. The construction method for accurately controlling the thickness of the concrete cast-in-place floor slab as claimed in claim 1, wherein: and 7, when the top plate range and the elevation are rechecked in the step 7, the elevation deviation of the template is more than +5mm, and the top plate range is more than 15mm, so that the support die frame and the elevation of the template must be adjusted.
7. The construction method for accurately controlling the thickness of the concrete cast-in-place floor slab as claimed in claim 3, wherein: the control block is prefabricated by fine aggregate concrete before the concrete floor slab is poured, the matching grade of the concrete is higher than the designed strength of the cast-in-place floor slab by at least the grade, and the control block is watered, moistened and dried in the sun before use.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010163832.0A CN111321834A (en) | 2020-03-10 | 2020-03-10 | Construction method for accurately controlling thickness of concrete cast-in-place floor |
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| CN202010163832.0A CN111321834A (en) | 2020-03-10 | 2020-03-10 | Construction method for accurately controlling thickness of concrete cast-in-place floor |
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| CN110067391A (en) * | 2018-01-22 | 2019-07-30 | 五冶集团上海有限公司 | A kind of control method of pouring thickness of concrete floor |
| CN110130587A (en) * | 2019-06-10 | 2019-08-16 | 浙江大华建设集团有限公司 | Double helix adjustable multifunctional split heads and floor dimensional control methods based on split heads |
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| TW311629U (en) * | 1996-08-22 | 1997-07-21 | Jian-Xing He | Level auxiliary apparatus for grouting thickness of floor |
| JPH10299252A (en) * | 1997-04-25 | 1998-11-10 | Ohbayashi Corp | Placing method of concrete |
| TW472810U (en) * | 2000-02-01 | 2002-01-11 | Jian-Shing He | Improved aid device for checking horizontally the thickness of floor grouting |
| JP2004522024A (en) * | 2001-06-12 | 2004-07-22 | スル キム，ジン | Leveling rods for building construction |
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Application publication date: 20200623 |
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