Cast-in-place floor formwork-free system and concrete floor construction method

Abstract

The invention discloses a cast-in-place floor formwork-free system and a concrete floor construction method.The cast-in-place floor formwork-free system comprises longitudinal beams which are oppositely arranged at intervals, each longitudinal beam is provided with a plurality of connecting plates exposed out of the inner side face of the longitudinal beam, the connecting plates are distributed in the length direction of the longitudinal beams at intervals, and brackets are fixed to the connecting plates; the cross beams are arranged on the brackets of the longitudinal beams on the two sides in a lap joint mode, and the cross beams distributed in the length direction of the longitudinal beams on the two sides at intervals form a formwork supporting system and can serve as a formwork of a cast-in-place floor. In the construction process, only formworks need to be laid on an erected formwork supporting system for concrete pouring, and after concrete is hardened, the cross beams can be dismantled. Therefore, when the formwork-erecting-free system is applied to construction of the floor slab, a traditional formwork supporting system is omitted, occupation of on-site space can be reduced, and sufficient supporting force and construction safety are guaranteed; the construction process is simplified, the time for building and dismantling the formwork is shortened, the labor cost is saved, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a cast-in-place floor slab formwork-free system and a concrete floor slab construction method. Background Art

[0002] In modern construction, the formwork support system is a key component to ensure the safety, quality and efficiency of concrete structure construction. Traditional formwork support systems, such as full-height scaffolding, usually take up a lot of on-site space and are time-consuming and labor-intensive to set up and dismantle, which has a certain impact on the continuity and efficiency of on-site construction.

[0003] In the prior art, the construction of concrete structures generally uses full-height scaffolding or independent support systems to build formwork. These systems are usually composed of a large number of steel pipes, fasteners, etc., and require a large amount of manpower on site for installation and removal. However, traditional full-height scaffolding takes up a lot of space during the construction process. For construction sites with limited space, such as cramped sites and buildings connected by corridors, it is impossible to achieve continuous temporary transportation roads, which limits construction efficiency. On the other hand, the materials of traditional support systems are heavy and require large lifting equipment for transportation and installation, which not only increases construction costs and on-site safety risks, but also takes a long time to build and dismantle full-height scaffolding, affecting the progress of the project. Summary of the invention

[0004] The purpose of the present invention is to provide a cast-in-place floor slab formwork-free system and a concrete floor slab construction method, which can reduce the occupation of on-site space, ensure sufficient supporting force and construction safety; and shorten the time for formwork erection and dismantling, save labor costs, and speed up the construction progress.

[0005] The present invention is implemented as follows: a cast-in-place floor slab formwork-free system includes longitudinal beams, multiple supports and multiple cross beams that are relatively spaced apart, the longitudinal beams having multiple first connecting plates whose inner sides are exposed, and the multiple first connecting plates are spaced apart along the length direction of the longitudinal beams; the support is fixedly mounted on the first connecting plate, and the two ends of the cross beam are respectively placed on the support of the longitudinal beams on both sides.

[0006] Furthermore, the first connecting plate is provided with a mounting hole, and the bracket is fixedly connected to the first connecting plate via a chemical anchor bolt.

[0007] Furthermore, the formwork-free system also includes an inclined support, the top end of which is hinged to the crossbeam, and a connecting portion is fixed to the bottom end; the longitudinal beam has a second connecting plate exposed on its inner side, and the connecting portion is fixedly connected to the second connecting plate by a chemical anchor.

[0008] Furthermore, the oblique support has a telescopic adjustment function, and the oblique support includes at least two mutually nested section tubes, each section tube is provided with a plurality of spaced connection holes along its length direction, and two adjacent section tubes are fastened and connected by bolts inserted into the connection holes.

[0009] Furthermore, the longitudinal beam is a concrete beam or a steel beam; when the longitudinal beam is a concrete beam, the first connecting plate and the second connecting plate are buried in the concrete of the concrete beam; when the longitudinal beam is a steel beam, the first connecting plate and the second connecting plate are fixed on the inner side of the steel beam by welding or factory prefabrication.

[0010] To achieve the above-mentioned object of the invention, the present invention also provides a concrete floor construction method, comprising the following steps:

[0011] Before construction, plan the layout of the formwork-free system based on the construction drawings and specific site conditions;

[0012] The processing of the formwork system must be numbered according to the detailed drawings and the parts used in the building, and stored in the warehouse at the construction site;

[0013] Before hoisting the longitudinal beam, an adjustable diagonal support is installed on the ground, wherein the top of the diagonal support is hinged to the cross beam by bolts, and the bottom of the diagonal support is fastened to the connecting plate on the inner side of the longitudinal beam by chemical anchor bolts;

[0014] Adjust the length of the inclined support to make the beam reach a horizontal position, and tighten the bolts on the inclined support;

[0015] According to the length of the longitudinal beam, a cross beam is set at each distance to ensure that all cross beams are installed in place according to the design drawings;

[0016] Check and adjust the elevation and levelness of all beams to ensure they meet the design requirements, and check the bolts to prevent loosening;

[0017] After the cross beam is installed, it is hoisted together with the longitudinal beam. No one is allowed below during hoisting, and safety personnel must be present to supervise;

[0018] After the longitudinal beam is installed and stabilized, check the elevation and levelness of the cross beam again and make fine adjustments to ensure that the error is within the specified range;

[0019] When the span of cast-in-place floor exceeds 4m, the formwork needs to be arched; according to the arch height of the prestressed hollow slab, adjust the beam elevation and adjust the diagonal support to the design elevation;

[0020] After adjusting the crossbeam, lay the steel square tube secondary ribs. Both ends should be placed on the crossbeam to avoid overhanging. The secondary ribs should be placed stably.

[0021] Use at least one cement nail to fix the formwork to the secondary rib, and the distance between the nail and the edge of the formwork should be greater than 20mm;

[0022] When splicing the template, the seam width should be controlled within 2mm, and the height difference at the splicing point should not exceed 2mm; after the plastic template is installed, use a horizontal laser instrument to level it to ensure the accuracy of the structural elevation;

[0023] After laying the formwork, it needs to be cleaned and coated with a release agent, moistened with clean water, and expansion joints should be left between the plastic formworks. The joints should be located above the secondary ribs of the steel square to avoid overhanging.

[0024] The reinforcement of cast-in-place slab strips should be tied simultaneously with the reinforcement of prestressed hollow slab surface. The additional reinforcement at the bottom of the slab should be tied separately, and the slab surface reinforcement should be connected with the hollow slab surface reinforcement.

[0025] Clean the impurities from the formwork, mark the spacing between the main reinforcement and the distribution reinforcement with chalk, and then place the reinforcement according to the marks;

[0026] When tying the steel bars, use straight buckles or eight-shaped buckles to ensure that they are tied firmly. Because the plate is thick, iron horse stools should be added between the upper and lower layers of steel bars to fix the position of the upper steel bars;

[0027] Before pouring concrete, a construction passage should be built for personnel to walk and place equipment;

[0028] Concrete pouring can only be carried out after all the floor slab reinforcements have been tied and accepted. First, pour the cast-in-place slab strip, and then pour it together after it is flush with the hollow slab surface;

[0029] The cast-in-place slab concrete should be poured symmetrically from the middle to both ends, and vibrated with an inserted vibrator, taking care to avoid touching the formwork to prevent leakage;

[0030] After pouring, the concrete is sprinkled with water to maintain a moist state;

[0031] The time for removing the formwork depends on the type of structure, climatic conditions and concrete strength grade. When the construction period is tight, it is necessary to prevent damage to the structure due to premature formwork removal.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The formwork-free system for cast-in-place floor slabs provided by the present invention comprises longitudinal beams arranged at relatively intervals, the longitudinal beams having a plurality of connecting plates whose inner side surfaces are exposed, the plurality of connecting plates being spaced apart along the length direction of the longitudinal beams, brackets being fixed on the connecting plates, cross beams being placed on the brackets of the longitudinal beams on both sides, and the cross beams spaced apart along the length direction of the longitudinal beams on both sides constitute a formwork support system, which can be used as a formwork for cast-in-place floor slabs. During the construction process, it is only necessary to lay the formwork on the set-up formwork support system for concrete pouring, and the cross beams can be removed after the concrete hardens. This process eliminates the need for the traditional formwork support system, greatly simplifies the construction process, and improves construction efficiency. In summary, the use of the cast-in-place formwork-free system for constructing floor slabs has at least the following advantages:

[0034] 1. Space saving: Traditional formwork methods often require a large number of temporary brackets, occupying valuable construction site space, while the formwork-free system of this application reduces the number of brackets occupying space by utilizing the longitudinal beams on both sides. This advantage is more prominent, especially in construction sites with limited space.

[0035] 2. Structural innovation: The formwork-free system has a novel design concept. The crossbeam is supported by brackets, so construction can be carried out without affecting the access and smooth flow of roads.

[0036] 3. Efficient construction: The rapid installation and removal characteristics of the formwork-free system of this application greatly shorten the construction time and improve the construction efficiency. In comparison, the traditional formwork method often takes a long time to build and remove the support.

[0037] 4. High safety: The formwork-free system of this application reduces the risk of workers working at heights and improves the safety of construction. However, the safety risk of traditional formwork methods is relatively high when working at heights.

[0038] 5. Wide application scope: The formwork-free system of this application is particularly suitable for various construction sites that include beam-slab structures at the same time, and has good versatility. However, the traditional formwork method is limited by the specific conditions of the construction site, and the scope of application may be limited.

[0039] 6. Environmental protection and energy saving: The formwork-free system of this application reduces the use of materials and the generation of waste, reduces environmental pollution, and meets the requirements of green construction. Traditional formwork methods may generate more construction waste.

[0040] 7. Economical: The formwork-free system of this application saves the time of setting up and dismantling temporary supports, reduces labor costs and construction period, and thus reduces engineering costs. The traditional formwork method may be more expensive due to the long time and human resource investment.

[0041] 8. Easy to operate: The formwork-free system of this application is reasonably designed, simple to operate, and easy to use, which improves the convenience of construction workers. In contrast, traditional formwork methods may require more professional skills and experience.

[0042] 9. Good stability: The formwork-free system of the present application supports the cross beams through brackets fixed on the longitudinal beams, thereby ensuring the stability of the formwork and avoiding the safety hazards of the traditional formwork system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of the planar structure of the cast-in-place floor slab formwork-free system provided in this embodiment;

[0044] Figure 2 It is a schematic diagram after pouring a concrete floor slab on the cast-in-place floor slab formwork-free system provided in this embodiment.

[0045] Numbers in the figure:

[0046] 1. Longitudinal beam; 2. Bracket; 3. Cross beam; 4. First connecting plate; 5. Chemical anchor bolt; 6. Diagonal support; 7. Second connecting plate; 8. Bolt; 200. Cast-in-place floor slab. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Please refer to Figure 1 and Figure 2, showing a formwork-free system for cast-in-place floor slabs provided in this embodiment, including longitudinal beams 1, multiple brackets 2 and multiple cross beams 3 arranged at relatively intervals. The longitudinal beam 1 is pre-buried with multiple first connecting plates 4 that are exposed on its inner side surface, and the multiple first connecting plates 4 are spaced apart along the length direction of the longitudinal beam 1. The number of brackets 2 is the same as the number of first connecting plates 4. The first connecting plates 4 are provided with mounting holes, and each bracket 2 is fixedly connected to a first connecting plate 4 by a chemical anchor 5. The two ends of the cross beam 3 are respectively placed on the brackets 2 of the longitudinal beams 1 on both sides. In this embodiment, square tubes are used as the cross beams 3, and multiple square tubes are spaced apart along the length direction of the longitudinal beams 1 on both sides to form a formwork support system, which is used as a formwork for the cast-in-place floor slab 200.

[0050] Furthermore, the formwork-free system of this embodiment also includes an oblique support 6, the top end of which is fixedly hinged to the cross beam 3, and a connecting portion is fixed to the bottom end. The longitudinal beam 1 is also pre-buried with a second connecting plate 7 with its inner side exposed directly below the first connecting plate 4, and the connecting portion at the bottom end of the oblique support 6 is fixedly connected to the second connecting plate 7 by a chemical anchor 5. Preferably, the oblique support 6 of this embodiment has a telescopic adjustment function, and the oblique support 6 includes at least two mutually nested section tubes, and each section tube is provided with a plurality of spaced connection holes along its length direction. By aligning the different connection holes on the two section tubes, oblique supports 6 of different lengths can be obtained. When adjusted to the desired length, the connection is fastened by inserting bolts 8 into the connection holes of the two section tubes.

[0051] In this embodiment, if Figure 2 As shown, the longitudinal beam 1 is a concrete beam, and the first connecting plate 4 and the second connecting plate 7 are embedded in the concrete of the concrete beam. In other embodiments, the longitudinal beam 1 can be a steel beam. When the longitudinal beam 1 is a steel beam, the first connecting plate 4 and the second connecting plate 7 are fixed to the inner side of the steel beam by welding or factory prefabrication.

[0052] The steps of constructing a concrete floor slab using the formwork-free system of this embodiment are as follows:

[0053] Before construction, the layout of the formwork-free system should be planned according to the construction drawings and specific site conditions, and communication and coordination should be carried out with relevant construction units.

[0054] Finished products must be numbered according to the detailed drawings and the parts used in the building, and stored in the warehouse at the construction site. When receiving them, you must submit the material collection form issued by the project department.

[0055] Before hoisting the longitudinal beam 1, an adjustable diagonal support 6 is first installed on the ground, wherein the top of the diagonal support 6 is hinged to the cross beam 3 by bolts, and the bottom of the diagonal support 6 is fastened to the second connecting plate 7 on the inner side of the longitudinal beam 1 by chemical anchor bolts 5.

[0056] Adjust the length of the inclined support 6 so that the beam 3 reaches a horizontal position, and tighten the bolts 8 on the inclined support 6.

[0057] According to the length of the longitudinal beam 1, a cross beam 3 is set every 900 mm to ensure that all cross beams 3 are installed in place according to the design drawings.

[0058] Check and adjust the elevation and levelness of all beams 3 to ensure that they meet the design requirements, and check the bolts 8 to prevent loosening.

[0059] After the cross beam 3 is installed, it is hoisted together with the longitudinal beam 1. No one is allowed below during hoisting, and safety personnel must be present to supervise.

[0060] After the longitudinal beam 1 is installed and stabilized, the elevation and levelness of the cross beam 3 are checked again and fine-tuned to ensure that the error is within 2 mm.

[0061] When the span of cast-in-place slab 200 exceeds 4m, the formwork needs to be arched. According to the arch height of the prestressed hollow slab, adjust the elevation of beam 3 and adjust the diagonal support to the design elevation.

[0062] After adjusting the cross beam 3, lay the steel square tube secondary ribs, the horizontal spacing of the secondary ribs is 250mm, and both ends need to be placed on the cross beam 3 to avoid overhanging. The secondary ribs should be placed stably.

[0063] Use at least one cement nail to fix the formwork to the secondary rib, and the distance between the nail and the edge of the formwork should be greater than 20mm.

[0064] When splicing the template, the seam width should be controlled within 2mm, and the height difference at the splicing point should not exceed 2mm. After the plastic template is installed, use a horizontal laser instrument to level it to ensure the accuracy of the structural elevation.

[0065] After the template is laid, it needs to be cleaned and coated with a release agent, and moistened with clean water. A 1mm to 2mm expansion joint should be left between the plastic templates, and the joint should be located above the secondary ribs of the steel square to avoid overhanging.

[0066] The reinforcement of cast-in-place slab strips should be tied simultaneously with the reinforcement of prestressed hollow slab surface. The additional reinforcement at the bottom of the slab is tied separately, and the slab surface reinforcement needs to be connected with the hollow slab surface reinforcement.

[0067] Clean the impurities on the formwork, mark the distance between the main reinforcement and the distribution reinforcement with chalk, and then place the reinforcement according to the marks.

[0068] When tying the steel bars, use straight buckles or eight-shaped buckles to ensure that they are tied firmly. Because the plate is thick, iron horse stools should be added between the upper and lower layers of steel bars to fix the position of the upper steel bars.

[0069] After the steel bars are tied, people are prohibited from walking on them at will. Before pouring concrete, a construction passage should be built for people to walk and place equipment.

[0070] Concrete pouring can only be carried out after all the floor slab reinforcements have been tied and accepted. Pour the cast-in-place slab strip first, and then pour it together after it is flush with the hollow slab surface.

[0071] The cast-in-place slab concrete should be poured symmetrically from the middle to both ends, and vibrated using an inserted vibrator. Be careful to avoid touching the formwork to prevent leakage.

[0072] After pouring, the concrete is sprinkled with water to keep it moist.

[0073] The time for formwork removal depends on the type of structure, climatic conditions and concrete strength grade. In the case of tight construction schedule, premature formwork removal should be avoided to prevent structural damage.

[0074] In summary, the cast-in-place floor slab formwork-free system of this embodiment has at least the following advantages:

[0075] 1. Space saving: Traditional formwork methods often require a large number of temporary brackets, which occupy valuable construction site space. The formwork-free system of this embodiment reduces the brackets that occupy space by utilizing the longitudinal beams on both sides. This advantage is more prominent, especially in construction sites with limited space.

[0076] 2. Structural innovation: The design concept of the formwork-free system is novel. The crossbeam 3 is supported by the bracket, so construction can be carried out without affecting the access and smooth flow of roads.

[0077] 3. Efficient construction: The quick installation and removal characteristics of the formwork-free system of this embodiment greatly shorten the construction time and improve the construction efficiency. In comparison, the traditional formwork method often takes a long time to build and remove the support.

[0078] 4. High safety: The formwork-free system of this embodiment reduces the risk of workers working at heights and improves the safety of construction. However, the safety risk of traditional formwork methods is relatively high when working at heights.

[0079] 5. Wide application scope: The formwork-free system of this embodiment is particularly suitable for construction sites where the cumulative vertical height of two layers reaches up to 12 meters, and has good versatility. The traditional formwork method is limited by the specific conditions of the construction site, and the scope of application may be limited.

[0080] 6. Environmental protection and energy saving: The formwork-free system of this embodiment reduces the use of materials and the generation of waste, reduces environmental pollution, and meets the requirements of green construction. However, the traditional formwork method may generate more construction waste.

[0081] 7. Economical: The formwork-free system of this embodiment saves the time of setting up and dismantling temporary supports, reduces labor costs and construction period, and thus reduces engineering costs. The traditional formwork method may be more expensive due to the long time and human resource investment.

[0082] 8. Easy to operate: The formwork-free system of this embodiment is reasonably designed, simple to operate, and easy to use, which improves the convenience of construction workers. In contrast, the traditional formwork method may require more professional skills and experience.

[0083] 9. Good stability: The formwork-free system of this embodiment supports the cross beam 3 by means of the bracket 2 fixed on the longitudinal beam 1, thereby ensuring the stability of the formwork and avoiding the safety hazards of the traditional formwork system.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cast-in-place floor slab formwork-free system, characterized in that: It includes longitudinal beams, multiple brackets and multiple cross beams that are relatively spaced apart. The longitudinal beams have multiple first connecting plates that expose their inner sides, and the multiple first connecting plates are spaced apart along the length direction of the longitudinal beams. The brackets are fixedly mounted on the first connecting plates, and the two ends of the cross beams are respectively placed on the brackets of the longitudinal beams on both sides.

2. The cast-in-place floor slab formwork-free system according to claim 1, characterized in that: The first connecting plate is provided with a mounting hole, and the bracket is fixedly connected to the first connecting plate via a chemical anchor bolt.

3. The cast-in-place floor slab formwork-free system according to claim 1, characterized in that: It also includes an oblique support, the top end of which is hinged to the crossbeam, and a connecting portion is fixed to the bottom end; the longitudinal beam has a second connecting plate exposed on its inner side, and the connecting portion is fixedly connected to the second connecting plate by a chemical anchor bolt.

4. The cast-in-place floor slab formwork-free system according to claim 3, characterized in that: The oblique support has a telescopic adjustment function and comprises at least two mutually nested section tubes. Each section tube is provided with a plurality of spaced connection holes along its length direction. Two adjacent section tubes are fastened and connected by bolts inserted into their connection holes.

5. The cast-in-place floor slab formwork-free system according to claim 3, characterized in that: The longitudinal beam is a concrete beam or a steel beam; when the longitudinal beam is a concrete beam, the first connecting plate and the second connecting plate are buried in the concrete of the concrete beam; when the longitudinal beam is a steel beam, the first connecting plate and the second connecting plate are fixed on the inner side of the steel beam by welding or factory prefabrication.

6. A method for constructing a concrete floor, characterized in that: The following steps are involved: Before construction, plan the layout of the formwork-free system based on the construction drawings and specific site conditions; The processing of the formwork system must be numbered according to the detailed drawings and the parts used in the building, and stored in the warehouse at the construction site; Before hoisting the longitudinal beam, an adjustable diagonal support is installed on the ground, wherein the top of the diagonal support is hinged to the cross beam by bolts, and the bottom of the diagonal support is fastened to the connecting plate on the inner side of the longitudinal beam by chemical anchor bolts; Adjust the length of the inclined support to make the beam reach a horizontal position, and tighten the bolts on the inclined support; According to the length of the longitudinal beam, a cross beam is set at each distance to ensure that all cross beams are installed in place according to the design drawings; Check and adjust the elevation and levelness of all beams to ensure they meet the design requirements, and check the bolts to prevent loosening; After the cross beam is installed, it is hoisted together with the longitudinal beam. No one is allowed below during hoisting, and safety personnel must be present to supervise; After the longitudinal beam is installed and stabilized, check the elevation and levelness of the cross beam again and make fine adjustments to ensure that the error is within the specified range; When the span of cast-in-place floor exceeds 4m, the formwork needs to be arched; according to the arch height of the prestressed hollow slab, adjust the beam elevation and adjust the diagonal support to the design elevation; After adjusting the crossbeam, lay the steel square tube secondary ribs. Both ends should be placed on the crossbeam to avoid overhanging. The secondary ribs should be placed stably. Use at least one cement nail to fix the formwork to the secondary rib, and the distance between the nail and the edge of the formwork should be greater than 20mm; When splicing the template, the seam width should be controlled within 2mm, and the height difference at the splicing point should not exceed 2mm; after the plastic template is installed, use a horizontal laser instrument to level it to ensure the accuracy of the structural elevation; After laying the formwork, it needs to be cleaned and coated with a release agent, moistened with clean water, and expansion joints should be left between the plastic formworks. The joints should be located above the secondary ribs of the steel square to avoid overhanging. The reinforcement of cast-in-place slab strips should be tied simultaneously with the reinforcement of prestressed hollow slab surface. The additional reinforcement at the bottom of the slab should be tied separately, and the slab surface reinforcement should be connected with the hollow slab surface reinforcement. Clean the impurities from the formwork, mark the spacing between the main reinforcement and the distribution reinforcement with chalk, and then place the reinforcement according to the marks; When tying the steel bars, use straight buckles or eight-shaped buckles to ensure that they are tied firmly. Because the plate is thick, iron horse stools should be added between the upper and lower layers of steel bars to fix the position of the upper steel bars; Before pouring concrete, a construction passage should be built for personnel to walk and place equipment; Concrete pouring can only be carried out after all the floor slab reinforcements have been tied and accepted. First, pour the cast-in-place slab strip, and then pour it together after it is flush with the hollow slab surface; The cast-in-place slab concrete should be poured symmetrically from the middle to both ends, and vibrated with an inserted vibrator, taking care to avoid touching the formwork to prevent leakage; After pouring, the concrete is sprinkled with water to maintain a moist state; The time for removing the formwork depends on the type of structure, climatic conditions and concrete strength grade. When the construction period is tight, it is necessary to prevent damage to the structure due to premature formwork removal.

Images