Construction methods for cast-in-place concrete floor slabs

Abstract

This invention belongs to the field of concrete slab construction in building engineering, specifically relating to a method for constructing cast-in-place concrete floor slabs. It is mainly applied to the concrete pouring construction of multi-level floor slabs, including: erecting formwork; installing reinforcing bars; placing metal baffles around the floor slab pouring area and at the junction of adjacent floor slabs at two different levels; pouring floor slab concrete; adjusting the floor slab concrete height; vibrating the concrete; leveling the concrete; and curing the concrete. By using metal baffles, this invention solves the quality problems that are common in conventional timber formwork construction, such as concrete encroaching on the formwork, difficulty in removing the timber, poor appearance quality of the lowered area of ​​the formed concrete floor slab, and difficulty in handling the grooves left by the timber. This improves construction efficiency and enhances the quality and appearance of the concrete pouring.

Description

Technical Field

[0001] This invention belongs to the field of construction of slab concrete components in building engineering, and specifically relates to a construction method for cast-in-place concrete floor slabs, especially for concrete floor slabs with multiple elevation changes. Background Technology

[0002] In residential projects, to prevent water seepage in water-contaminated rooms such as bathrooms, kitchens, and balconies, the concrete floor slabs of different rooms on the same floor may have different elevations. There are also other instances of inconsistent design elevations: for example, the design of concrete floor slabs may consider the need for underfloor heating and decorative finishes (such as floor tiles) in the interior; public corridors may not require underfloor heating, only floor tiles; and public elevator lobbies may not require underfloor heating or decorative finishes, remaining only the original concrete surface. Therefore, inconsistencies in the elevation of concrete floor slabs in elevator lobbies, public corridors, and interior rooms on the same floor can occur. To control the elevation of cast-in-place floor slabs, suspended formwork is often used for concrete pouring. However, observations show that the quality of floor slab pouring using suspended formwork is difficult to control, and the following quality problems are summarized: 1. Timber is used for hoisting formwork. The timber and formwork are fixed by welding short steel bars. During the concrete pouring process, the amount of concrete poured and the floor slab elevation are difficult to control. The timber is easily buried in the concrete and difficult to remove. After removal, it leaves strip grooves on the existing floor slab surface, which is difficult to deal with.

[0003] 2. It is difficult to control the verticality and flatness of the lines when the wooden blocks and templates are fixed by welding, and the appearance quality of the cast-in-place components is poor.

[0004] 3. The elevation control of the floor slabs on both sides of the height difference is not in place, and the elevation of the floor slab surface does not meet the design requirements, which leads to the inability of subsequent construction procedures to meet the design requirements.

[0005] Moreover, the diameter of the steel bars in concrete floor slabs is generally small and the strength is low. When workers are tying and inspecting the steel bars, they often step on them, which often causes deformation of the steel mesh and damage to the concrete spacers. This leads to an excessively large concrete cover in the floor slab, insufficient floor strength, and phenomena such as floor cracks and water leakage. Summary of the Invention

[0006] This application provides a method for constructing cast-in-place concrete floor slabs, aiming to solve at least one of the above-mentioned technical problems.

[0007] One embodiment of this application provides a method for constructing cast-in-place concrete floor slabs, mainly applied to the concrete pouring construction of multi-level elevation floor slabs, characterized by including: S100. Erecting formwork: Erect formwork support frames and formwork according to the design requirements of multi-level floor slabs; S200, Install steel reinforcement: Lay steel reinforcement in the floor slab pouring area according to design requirements; S300. Install metal baffles: Install metal baffles around the floor slab pouring area and at the junction of adjacent floor slabs at two different elevation levels. S400, Pouring floor slab concrete: Calculate the volume of concrete in the floor slab pouring area and pour the concrete; S500, Adjustment of floor slab concrete height: Adjust the height of poured concrete according to the design requirements of multi-level elevation floor slabs; S600, concrete vibration; S700 Concrete leveling: After vibration, surface leveling is carried out before the concrete sets. S800, concrete curing.

[0008] In one embodiment, step S200 further includes laying double-layer bidirectional reinforcing bars in the floor slab pouring area.

[0009] In one embodiment of the technical solution, step S200 further includes: during the processing of reinforcing bars, the reinforcing bars with the direction of elevation change are continuous reinforcing bars.

[0010] In one embodiment, the metal baffle has several through holes for the passage of reinforcing bars.

[0011] In one embodiment, the reinforcing hole is a waist-shaped reinforcing hole.

[0012] In one embodiment, the rib-piercing hole is a comb-tooth rib-piercing hole.

[0013] In one embodiment, the metal baffle has horizontally arranged slots, and a limiting strip is arranged in the slot. The limiting strip is used to restrict the vertical displacement of the reinforcing bar in the comb-tooth through-hole.

[0014] In one embodiment, the metal baffle has slots at both ends for engaging with adjacent metal baffles.

[0015] In one embodiment, the metal baffle is provided with a plurality of through holes for the passage of reinforcing bars. The through holes of the metal baffle located around the floor slab pouring area are waist-shaped through holes or comb-shaped through holes, and the through holes of the metal baffle located at the junction of two adjacent floor slabs at different elevations are comb-shaped through holes.

[0016] In one embodiment, the metal baffle is provided with several through holes of different sizes for concrete to pass through.

[0017] In one embodiment, the metal baffle at the junction of two adjacent floor slabs at different elevations has a double-layer structure with a slot in the middle. A mesh plate is installed in the slot, and the mesh plate slides vertically with the slot. The mesh plate is opened before pouring concrete and reset after pouring is completed.

[0018] In one embodiment, a scraper mechanism is used to adjust the height of poured concrete. The scraper mechanism includes a pair of height limiting plates, a pair of slide rails, and a scraper. The pair of height limiting plates are arranged in parallel and symmetrically and are fixedly connected to the metal baffle by fixing bolts. The pair of slide rails are arranged in parallel and symmetrically on the pair of height limiting plates, and the scraper is arranged on the pair of slide rails.

[0019] In one embodiment, the scraper includes two parts: a flat scraper and a toothed scraper.

[0020] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0021] The accompanying drawings in this application are for illustrating preferred embodiments and to facilitate a clear understanding by those skilled in the art of various other advantages and benefits, and should not be construed as limiting the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0022] Figure 1 This is a flowchart of a method for constructing a cast-in-place concrete floor slab in one embodiment of this application.

[0023] Figure 2 This is a side cross-sectional view of a multi-level elevation concrete floor slab in one embodiment of this application.

[0024] Figure 3 This is a top view of a multi-level elevation concrete floor slab in one embodiment of this application.

[0025] Figure 4 This is a frontal view of a metal baffle in one embodiment of this application.

[0026] Figure 5 This is a schematic diagram of the inside of the stencil in one embodiment of this application.

[0027] Figure 6 This is a frontal view of a metal baffle in one embodiment of this application.

[0028] Figure 7 This is a frontal view of a metal baffle in one embodiment of this application.

[0029] Figure 8This is a top view of a metal baffle in one embodiment of this application.

[0030] Figure 9 This is a frontal view of the scraper mechanism in one embodiment of this application.

[0031] Figure 10 This is a top view of the scraper mechanism in one embodiment of this application.

[0032] Figure 11 This is a schematic diagram of a scraper in one embodiment of this application.

[0033] Figure 12 This is a schematic diagram of a scraper in one embodiment of this application.

[0034] The following are the symbols and their meanings: floor slab 10, formwork 20, rebar 30, metal baffle 40, slot 41, fixing slot 42, waist-shaped rebar hole 43, comb-tooth rebar hole 44, limit strip 45, mesh plate 46, insert plate slot 47, scraper 51, handrail 52, slide rail 53, height limit plate 54, fixing bolt 55. Detailed Implementation

[0035] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments of this application, "multiple" and "several" mean two or more (including two), unless otherwise explicitly specified.

[0038] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0040] Figure 2 and Figure 3 Each example showcases a three-level concrete floor slab structure. See also Figure 2 From left to right, they are: Level 1 floor slab elevation 0 (corresponding to...) Figure 3 In the pouring area 1), the second floor slab elevation is -20 (corresponding to) Figure 3 The pouring area 2) and the third floor slab elevation -50 (corresponding to) Figure 3 3) of the pouring area. Based on Figure 2 and Figure 3 The three-level elevation concrete floor slab structure shown in this application provides a method for constructing cast-in-place concrete floor slabs, which involves pouring concrete floor slabs.

[0041] See Figure 1-12 As shown, a method for constructing cast-in-place concrete floor slabs, mainly applied to the concrete pouring construction of multi-level elevation concrete floor slabs 10, mainly includes the following steps: S100, Erecting formwork: Erect formwork support frames and formwork 20 according to the design requirements of multi-level elevation floor slab 10.

[0042] During the installation of formwork 20, ensure that the erection height of formwork 20 meets the requirements to avoid installation errors of formwork 20 affecting the subsequent floor slab 10 elevation.

[0043] S200, Install steel bars: Lay steel bars 30 in the pouring area of ​​the floor slab 10 according to the design requirements.

[0044] Specifically, double-layer, bidirectional steel bars 30 are laid in the pouring area of ​​floor slab 10.

[0045] Specifically, during the processing of steel bar 30, steel bar 30 with changing elevation direction is a through steel bar.

[0046] The turning accuracy of the 30mm rebar at elevation change locations must meet the requirements. If the 30mm rebar is broken at an elevation change location, the concrete and the concrete cover of the 30mm rebar at that location are prone to cracking during subsequent concrete pouring.

[0047] S300, Install metal baffles: Install metal baffles 40 around the pouring area of ​​floor slab 10 and at the junction of adjacent floor slabs 10 at two different elevation levels.

[0048] Before installing the metal baffle 40, a release agent that meets the quality requirements can be applied to the interface between the metal baffle 40 and the cast-in-place concrete, and to the interface between the bottom formwork 20 and the concrete.

[0049] To facilitate the passage of the reinforcing bars 30 and ensure their integrity, the metal baffle 40 is provided with several through holes for the reinforcing bars 30 to pass through. Specifically, the metal baffle 40 is arranged with two rows of through holes, the width of which matches the diameter of the reinforcing bars 30, consistent with the arrangement of the reinforcing bars, that is, the spacing between the upper and lower holes is equal to the spacing between the two layers of reinforcing bars.

[0050] In some embodiments, see Figure 3 The metal baffle 40 has slots 41 at both ends for engaging with adjacent metal baffles 40.

[0051] In some embodiments, see Figure 4 The reinforcing bar holes are designed as waist-shaped reinforcing bar holes 43, and the elliptical elongated holes are mainly designed to accommodate reinforcing bars 30 of different thicknesses in floor slabs.

[0052] In some embodiments, see Figure 7 The rib-piercing hole is a comb-tooth rib-piercing hole 44.

[0053] Furthermore, a horizontally arranged slot is provided on the metal baffle 40, and a limiting strip 45 is arranged in the slot. The limiting strip 45 is used to restrict the vertical displacement of the reinforcing bar 30 in the comb tooth through hole 44.

[0054] In some embodiments, the metal baffle 40 has several through holes for the reinforcing bars 30 to pass through. The through holes of the metal baffle 40 located around the pouring area of ​​the floor slab 10 are either waist-shaped through holes 43 or comb-tooth through holes 44. The through holes of the metal baffle 40 located at the junction of two adjacent floor slabs 10 at different elevations are comb-tooth through holes 44. The metal baffle 40 with comb-tooth through holes 44 is located in the middle of the pouring area, making it easier to remove.

[0055] During installation, the double rows of reinforcing bars 30 on the upper and lower parts of the floor slab 10 are passed through the through holes at the upper and lower positions of the metal baffle 40, respectively. The metal baffle 40 is then installed to the designed position along the reinforcing bars 30, and measurements are taken. After installation, the metal baffles 40 in the surrounding areas are installed.

[0056] When installed on floor slabs with no elevation changes, the reinforcing bars do not need to be bent, thus eliminating the need for further measurement.

[0057] During installation, the metal baffle 40 with comb-tooth through holes 44 is installed in the same way as above. After installation, the limit strip 45 needs to be inserted to restrict the falling of the steel bar 30.

[0058] After the metal baffle 40 is installed, its position is checked.

[0059] S400, Pouring floor slab concrete: Calculate the volume of concrete in the pouring area of ​​floor slab 10, and pour the concrete. In some embodiments, the metal baffle 40 has several through holes of different sizes (not shown in the figure) for concrete to pass through. Further, the metal baffle 40 at the junction of two adjacent floor slabs 10 is a double-layer structure with a slot 47 in the middle. A mesh plate 46 is installed in the slot 47, and the mesh plate 46 slides vertically into the slot 47. The mesh plate 46 is opened before pouring concrete and reset after pouring is completed.

[0060] In some embodiments, corner braces are provided at the corners of the mesh plate 46. When the mesh plate 46 is pulled out, the corner braces are opened, allowing them to rest on the metal baffle, preventing the mesh plate 46 from falling off by itself. Concrete aggregate can pass through the metal baffle 40 with comb-tooth through holes 44 and flow on both sides of the metal baffle; the metal baffle 40 arranged around the pouring area does not have the aforementioned through holes on its two sides.

[0061] During concrete pouring, on-site workers should avoid stepping on the metal baffle 40 and the mesh plate 4646 to prevent the metal baffle 40 from moving. After the concrete pouring is completed, the position of the metal baffle 40 should be checked.

[0062] S500, Adjustment of floor slab concrete height: Adjust the height of the poured concrete according to the design requirements of the multi-level elevation floor slab 10.

[0063] In some embodiments, a scraper mechanism is used to adjust the height of poured concrete. The scraper mechanism includes a pair of height limiting plates 54, a pair of slide rails 53, and a scraper 51. The pair of height limiting plates 54 are arranged in parallel and symmetrically and are fixedly connected to a metal baffle 40 by fixing bolts 55 (the metal baffle 40 has corresponding fixing grooves 42 for cooperating with the fixing bolts 55). The pair of slide rails 53 are arranged in parallel and symmetrically on the pair of height limiting plates 54, and the scraper 51 is arranged on the pair of slide rails 53.

[0064] When using a scraper mechanism to adjust the concrete pouring height: After the concrete pouring is completed, the scraper 51 can be used to adjust the concrete pouring height to accommodate the different pouring heights in different pouring areas. During the adjustment process, the mesh plate 46 is in the open state, allowing the concrete to flow on both sides of the baffle. After the height adjustment is completed, the mesh plate 46 is lowered. The mesh plate 46 has fine holes, which can prevent the concrete from continuing to flow.

[0065] For pouring areas with consistent floor slab elevations, preliminary concrete vibration and leveling can be performed. During vibration, the mesh plate 46 should also be in the open state, and the concrete for the floor slab 10 in the same floor should be of the same strength grade. Alternatively, the scraper mechanism can be omitted, and the concrete pouring height can be adjusted directly through the metal baffle 40, with the scraper 51 used for fine leveling.

[0066] S600, concrete vibration.

[0067] S700 Concrete Leveling: After vibration, the surface is leveled before the concrete sets.

[0068] In one embodiment, the scraper 51 includes two parts: a flat scraper and a toothed scraper.

[0069] After vibration, the surface is leveled and roughened before the concrete sets. Roughening is necessary on concrete structural floor slabs where other construction processes are performed, such as... Figure 3 The pouring area 2 described in the text requires the laying of facing bricks; pouring areas 1 and 3 are leveled. A flat scraper 51 can be used to level and finish the concrete surface; for areas that require tiling or where there is still subsequent construction work to be done on the cast-in-place floor slab, a toothed scraper can be used to roughen the shaped surface, which will result in stronger adhesion between the roughened concrete surface and the subsequent construction work.

[0070] S800, concrete curing.

[0071] In summary, the beneficial effects of this application mainly include: (1) By using metal baffles, the problems that are easy to occur during conventional timber formwork construction, such as concrete eating the formwork, difficulty in removing the timber, poor appearance quality of the formed concrete floor slab drop area, and difficulty in handling the grooves left by the timber, are solved. This improves construction efficiency and enhances the quality and appearance of concrete pouring.

[0072] (2) The through holes of the metal baffle can limit the deformation of the double-layer steel bars in the floor slab caused by workers and the acceptance process. At the same time, the setting of the limit strip limits the position of the double-layer steel bars, eliminating the need to set concrete pads. This solves the problems of easy deformation of the mesh and excessive thickness of the protective layer, ensuring that the reinforced concrete protective layer meets the design requirements, reducing construction costs, and improving the construction quality of floor slab steel bar binding and concrete pouring.

[0073] (3) Using metal baffles to form a more regular pouring area can improve the accuracy of concrete pouring quantity calculation. Metal baffles with holes on the side are set in the pouring area. Under the premise of controlling the total amount of concrete poured, the concrete is vibrated by vibrating rod to realize the flow of concrete in the pouring area, which greatly reduces the phenomenon of insufficient or excessive concrete pouring. Large pouring quantity leads to waste; insufficient pouring quantity easily forms construction cold joints; and can improve the level of construction management.

[0074] (4) The use of a scraper with a sliding rail can adjust the height of the concrete pouring surface, level it, and roughen it. There is no need to install the suspended formwork. This solves the problem that the suspended formwork is not firmly fixed and the concrete pouring quality is poor. It improves construction efficiency and enhances project quality.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no contradiction or conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cast-in-place concrete floor construction method, mainly applying concrete pouring construction of a multi-level elevation floor (10), characterized in that, include: S100, Erecting formwork: Erect formwork support frame and formwork (20) according to the design requirements of multi-level elevation floor slab (10); S200, Install steel bars: Lay steel bars (30) in the pouring area of ​​the floor slab (10) according to the design requirements; S300, Install metal baffles: Install metal baffles (40) around the pouring area of ​​floor slab (10) and at the junction of adjacent floor slabs (10) at two different elevation levels; S400, pour concrete for floor slab: calculate the volume of concrete in the pouring area of ​​floor slab (10) and pour the concrete; S500, Adjustment of concrete height of floor slab: Adjust the height of the poured concrete according to the design requirements of the multi-level elevation floor slab (10); S600, concrete vibration; S700 Concrete leveling: After vibration, surface leveling is carried out before the concrete sets. S800, concrete curing.

2. The method for constructing cast-in-place concrete floor slabs as described in claim 1, characterized in that: The step S200 further includes: laying double-layer bidirectional steel bars (30) in the pouring area of ​​the floor slab (10); during the processing of the steel bars (30), the steel bars (30) in the direction of elevation change are continuous steel bars.

3. The construction method for cast-in-place concrete floor slabs as described in claim 1, characterized in that: The metal baffle (40) has several through holes for the steel bars (30) to pass through; the metal baffle (40) has slots (41) at both ends for engaging with adjacent metal baffles (40).

4. The construction method for cast-in-place concrete floor slabs as described in claim 3, characterized in that: The through hole is either a waist-shaped through hole (43) or a comb-tooth through hole (44).

5. The construction method for cast-in-place concrete floor slabs as described in claim 4, characterized in that: The metal baffle (40) has horizontally arranged slots, and a limiting strip (45) is arranged in the slots. The limiting strip (45) is used to restrict the vertical displacement of the reinforcing bar (30) in the comb tooth through hole (44).

6. The method for constructing cast-in-place concrete floor slabs as described in claim 1, characterized in that: The metal baffle (40) is provided with several through holes for the passage of reinforcing bars (30). The through holes of the metal baffle (40) located around the pouring area of ​​the floor slab (10) are waist-shaped through holes (43) or comb-tooth through holes (44). The through holes of the metal baffle (40) located at the junction of two adjacent floor slabs (10) are comb-tooth through holes (44).

7. The method for constructing cast-in-place concrete floor slabs as described in claim 1, characterized in that: The metal baffle (40) has several through holes of different sizes for concrete to pass through.

8. The method for constructing cast-in-place concrete floor slabs as described in claim 7, characterized in that: The metal baffle (40) at the junction of two adjacent floor slabs (10) is a double-layer structure with a plate slot (47) in the middle. A mesh plate (46) is installed in the plate slot (47), and the mesh plate (46) slides and engages with the plate slot (47) up and down. The mesh plate (46) is opened before pouring concrete and reset after pouring is completed.

9. The method for constructing cast-in-place concrete floor slabs as described in claim 1, characterized in that: A scraper mechanism is used to adjust the height of the poured concrete. The scraper mechanism includes a pair of height limiting plates (54), a pair of slide rails (53), and a scraper (51). The pair of height limiting plates (54) are arranged in parallel and symmetrically and are fixedly connected to the metal baffle (40) by fixing bolts (55). The pair of slide rails (53) are arranged in parallel and symmetrically on the pair of height limiting plates (54), and the scraper (51) is arranged on the pair of slide rails (53).

10. The method for constructing cast-in-place concrete floor slabs as described in claim 9, characterized in that: The scraper (51) includes two parts: a flat scraper and a toothed scraper.

Images