Construction method for installing synchronous steel bars in beam plate by penetrating through floor support plate without disassembling bottom mold

Abstract

This invention relates to the field of floor decking construction technology, and discloses a construction method for installing floor decking without removing the bottom formwork and simultaneously inserting beam and slab reinforcement, including the following steps: S1, erecting a support frame; S2, installing beam formwork and floor joists; S3, installing floor decking in sections and at intervals, simultaneously inserting beam and slab reinforcement: S3.1, construction sectioning; S3.2, installing the first batch of floor decking within the beam span and inserting and binding beam and bottom slab reinforcement; S3.3, installing the first batch of slab surface reinforcement and additional reinforcement within the beam span; S3.4, installing the second batch of floor decking within the beam span; S3.5, laying bottom slab reinforcement, surface reinforcement, and additional reinforcement, installing the last floor decking at the pre-installation position, and finally binding and fixing the bottom slab reinforcement, surface reinforcement, and additional reinforcement; S4, concrete pouring. In practical applications, this invention fills the gap in specific construction methods for floor decking without removing the bottom formwork, reduces construction safety risks, improves the efficiency and quality of reinforcement construction, shortens the construction cycle, and reduces costs.

Description

Technical Field

[0001] This invention relates to the field of construction technology for building floor decking, specifically to a construction method for simultaneously inserting reinforcing bars into beams and slabs during the installation of floor decking without removing the bottom formwork. Background Technology

[0002] The formwork-free steel truss floor deck is a composite load-bearing slab that connects the steel truss and the formwork-free structure into a whole through special connectors or embedded connections. It is a new type of material that replaces traditional construction methods. The product is prefabricated in the factory and installed on site. It is an energy-saving and environmentally friendly product promoted by the Ministry of Construction.

[0003] Currently, there are two main construction methods for steel truss floor slabs that do not require removal of the bottom formwork: Method 1: The traditional steel truss floor deck installation method is adopted, which involves installing the beam reinforcement first and then installing the floor deck. This method not only has a long construction period, but also involves working near the edge, and the range of movement for construction workers is very limited and narrow. The surrounding area is suspended and easy to fall, which poses a great safety risk. Method 2 involves the reverse installation sequence of Method 1, i.e., installing the steel truss floor deck first, and then tying the beam reinforcement. However, this method presents challenges during construction. Because the upper and lower chord reinforcements of the floor deck are spaced apart on the sides of the beam, workers frequently suffer hand injuries from being scratched by these reinforcements while tying the beam reinforcement. Furthermore, compared to Method 1, this method requires the work height to be one slab thickness higher when tying the beam reinforcement, resulting in a narrower working space. This makes tying and fixing the bottom reinforcement, web reinforcement, tie bars, and stirrups more difficult, leading to poor beam reinforcement quality. Additionally, installing the bottom reinforcement after the steel truss floor deck (which requires no formwork removal) is not only inconvenient and time-consuming, but also reduces efficiency.

[0004] The existing construction methods for non-removable bottom formwork reinforced truss floor decks all have various construction problems. Therefore, this invention provides a construction method for installing non-removable bottom formwork floor decks and simultaneously inserting beam and slab reinforcement, to fill the gap in specific construction methods for non-removable bottom formwork reinforced truss floor decks, reduce safety risks, improve the efficiency and quality of reinforcement construction, shorten the construction cycle, reduce costs, and achieve a high level of safety and civility, as well as good concrete forming quality. Summary of the Invention

[0005] The present invention aims to provide a construction method for simultaneously inserting beam and slab reinforcement into the floor deck without removing the bottom formwork, so as to reduce construction safety risks, improve the efficiency and quality of reinforcement construction, shorten the construction cycle, and reduce costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a construction method for simultaneously inserting reinforcing bars into beams and slabs during the installation of floor decking without removing the bottom formwork, comprising the following steps: S1. Erection of support frame; S2. Installation of beam formwork and floor joists; S3. Floor decking is installed in sections with beam and slab reinforcement bars inserted simultaneously: S3.1 Construction Zoning: Divide the beam spans within the floors to be installed into the first batch of beam spans according to the order of floor slab installation. The first and second batches of installed beam spans are distributed alternately. S3.2 Installation of floor decking within the first batch of beam spans and interlacing and binding of beam reinforcement and slab bottom reinforcement: After the floor decking within the first batch of beam spans is laid, the construction personnel stand at the adjacent second batch of beam spans to first lay and bind the beam reinforcement, and then interlac and bind the slab bottom reinforcement. S3.3 Installation of the first batch of reinforcement bars and additional reinforcement bars on the inner slab surface of the beam span; S3.4 Second batch of beam span floor decking installation: During installation, reserve a pre-installation position for the last floor decking at any end of each beam span; S3.5. First, lay the bottom reinforcement and top reinforcement of the slab within the span of the second batch of installed beams. Then, install the last floor deck slab at the pre-installation position. Next, adjust the position of the bottom reinforcement and top reinforcement and tie them in place. Finally, lay and tie the additional reinforcement. S4. Concrete pouring.

[0007] The principles and advantages of this scheme are: 1. In practical applications, compared to the traditional method of tying beam reinforcement bars before installing floor decking, this invention allows for the installation of floor decking without removing the bottom formwork immediately after the support frame and beam formwork are installed. Beam reinforcement bars, bottom reinforcement bars, and top reinforcement bars are simultaneously inserted and tied. This simplifies the overall construction process, saves construction time, and divides the beam spans of the floors to be installed into a first batch and a second batch. The first and second batches are alternately distributed. During the construction of the second batch, the first batch, already laid out around the perimeter, provides ample and safe working platforms for construction personnel, effectively reducing edge work during the entire construction process, lowering construction safety risks, ensuring a high level of safety and civility, and effectively reducing overall costs.

[0008] 2. Compared to the traditional method of installing floor decking first and then binding the reinforcing bars, this invention installs the floor decking within the first batch of beam spans according to a pre-defined installation sequence. Then, construction workers stand at the adjacent second batch of beam spans to lay and bind the beam reinforcing bars, followed by the insertion and binding of the bottom and top reinforcing bars of the slab. This effectively reduces the binding height and difficulty of the beams, resulting in better quality beam reinforcing bars and concrete forming. At the same time, this construction method avoids the problem of construction workers' hands being scratched by the upper and lower chord reinforcing bars of the floor decking during binding, reducing safety risks, effectively shortening the construction cycle, and reducing construction costs.

[0009] 3. Unlike existing construction methods where floor decking is laid in each beam span before the bottom and top reinforcement bars are installed in the first batch of beam spans, this scheme allows for the installation of floor decking slabs in the second batch of beam spans. Instead of laying the bottom, top, and additional reinforcement bars before installing the floor decking slabs, a pre-installation position for the last floor decking slab is reserved at one end of each beam span. The bottom, top, and additional reinforcement bars are then laid, and the last floor decking slab is installed at the pre-installation position. Finally, the bottom, top, and additional reinforcement bars are tied and fixed. Because floor decking and beam reinforcement bars are already laid in the surrounding beam spans of the second batch of beam spans, the narrow operating space and difficulty in inserting the bottom reinforcement bars from all sides leads to low construction efficiency and long construction time. In this scheme, a floor decking slab is reserved at the end of each beam span and not installed immediately. Construction workers then insert the bottom and top reinforcement bars into the floor decking slab from the pre-installation position, making the operation simpler and more convenient, greatly improving construction efficiency and shortening the construction cycle.

[0010] 4. Compared to traditional formwork frames and traditional truss composite slabs, the formwork-free floor decking used in this invention is produced in a standardized factory, resulting in high forming quality, light weight, no need for formwork removal or plastering, and the ability to be cut. The reinforcing steel is of high forming quality, and the slab thickness qualification rate can reach over 95%, with no over-thickness phenomenon, thus saving costs. At the same time, the formwork-free floor decking eliminates some of the bottom formwork and support frame materials, resulting in a shorter support frame construction cycle, reduced labor, and effectively reduced construction costs.

[0011] Furthermore, in steps S3.2 and S3.3, the bottom reinforcement and top reinforcement of the slab are inserted into the floor deck by construction workers through the gaps on the side of the beam reinforcement near the second batch of installed beam spans.

[0012] In the above setup, construction workers insert the bottom and top slab reinforcement bars into the gaps on the side of the beam reinforcement bars at the second batch of installation beam spans. This makes the entire process of inserting the reinforcement bars simpler, faster, less difficult, and more efficient. It also effectively avoids the problem of construction workers getting their hands scratched by the upper and lower chord reinforcement bars of the floor slab during the insertion process, thus increasing construction safety.

[0013] Furthermore, in step S3.5, the bottom reinforcement bars and top reinforcement bars are inserted into the floor deck from the pre-installation position, and the ends of the bottom reinforcement bars and top reinforcement bars near the pre-installation position are completely inserted into the installed floor deck.

[0014] Since floor decking and beam reinforcement have already been laid on all four sides of each beam span in the second batch of installation beams, the above-mentioned setup allows for the insertion of the bottom and top reinforcement bars into the floor decking from the pre-installation position. This provides ample operating space, reduces the difficulty of inserting the reinforcement bars, greatly improves construction efficiency, and shortens the construction cycle. Furthermore, the ends of the bottom and top reinforcement bars are fully inserted into the already installed floor decking, facilitating the installation of the last floor decking at the pre-installation position and improving the smoothness of the overall installation process.

[0015] Furthermore, in step S3.5, after the last floor slab is installed at the pre-installation position for each span of the second batch of installed beams, the bottom reinforcement and top reinforcement of the slab are moved to the pre-installation position so that they are inserted into the last floor slab and tied and fixed.

[0016] The above setup avoids inserting reinforcing bars through the already laid first batch of installed beam spans and beam reinforcement. Instead, the bottom and top reinforcement bars of the slab are inserted through the pre-installed position before the last floor deck is installed. Then, the bottom and top reinforcement bars are moved to insert into the last floor deck and tied for fixation. The overall operation is simpler and more convenient, with high installation flexibility, which greatly improves construction efficiency and shortens the construction cycle.

[0017] Furthermore, in step S3.2, the slab reinforcement is distributed below the upper chord reinforcement of the truss, and the additional reinforcement is at the same height as the upper chord reinforcement of the truss.

[0018] The above-mentioned design aims to: 1) form a unified steel reinforcement skeleton with the slab reinforcement, additional reinforcement, and truss top chord reinforcement, thereby increasing the overall structural integrity of the floor deck and improving its load-bearing capacity; and 2) control upper cracks after the floor deck is poured with concrete, reduce upper tensile stress, and control the development of cracks on the slab surface.

[0019] Furthermore, in step S3.3, the intersection points of the slab reinforcement and the truss of the floor deck are tied, and the tying points of adjacent rows are staggered.

[0020] The staggered arrangement of the binding points in the adjacent rows serves two purposes: firstly, to ensure even distribution of the steel mesh, balanced stress on each steel bar, and avoid localized concentration; secondly, the staggered binding enhances the lateral and longitudinal connections of the floor deck, reduces slab deflection, and improves the overall rigidity, load-bearing capacity, and crack resistance of the floor deck; and thirdly, the staggered arrangement of binding points facilitates operation by construction workers, reduces overlapping pressure on steel bars, optimizes steel bar usage, reduces material waste, controls costs, and improves economic efficiency, while maintaining work efficiency and reducing overall construction costs.

[0021] Furthermore, in step S2, when the joint between two adjacent floor slabs within the same beam span is greater than 2mm, sealing material is used to seal it.

[0022] The above design is to prevent excessively large joints between adjacent floor slabs from leaking grout during concrete pouring, thus ensuring the joints are fully filled, enhancing the stability of the connection between floor slabs, avoiding potential hazards such as hollow areas and cracks, and improving the overall building safety.

[0023] Furthermore, in step S2, for beams with a smaller cross-sectional height, the formwork on both sides of the beam is closed simultaneously, and then the beam reinforcement is tied; for beams with an excessively large cross-sectional height, one of the following construction methods is selected: first lay the bottom slab of the beam, tie the beam reinforcement, and then close the side formwork; or after the beam formwork is installed, tie the beam reinforcement on the floor slab, then hoist the whole structure into place, and finally make adjustments.

[0024] The above settings select a suitable beam formwork installation method based on the beam cross-section height to ensure maximum efficiency and good binding quality in beam reinforcement binding. If the beam cross-section height is small, it will not hinder the binding of the bottom and side reinforcement bars. Therefore, the side formwork can be closed first and then the reinforcement bars can be bound. If the beam cross-section height is too large, closing the side formwork first will make it difficult to bind and fix the bottom reinforcement bars, web reinforcement bars, tie bars, and stirrups, affecting the beam reinforcement forming quality.

[0025] Furthermore, in step S2, vertical supports are provided at the bottom of the intersection of the floor joists, and the distance between adjacent vertical supports is no more than 1.2m.

[0026] The above arrangement results in a relatively dense distribution of floor joists within each span, ensuring even stress distribution when supporting the floor slab and resulting in good concrete forming quality. At the same time, the dense distribution of floor joists means that there are no large areas of unsupported space within each span, providing ample support for construction workers and reducing safety risks associated with working near edges. Attached Figure Description

[0027] Figure 1 This is a construction flowchart of an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the partitioning in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the floor decking installation according to an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the pre-installation positions within the span of the second batch of installation beams in an embodiment of the present invention.

[0031] Figure 5 This is a diagram of the intermediate support beam node in an embodiment of the present invention.

[0032] Figure 6 This is a diagram of the edge support beam node according to an embodiment of the present invention. Detailed Implementation

[0033] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1. First batch of installation beam span, 2. Second batch of installation beam span, 3. Pre-installation position, 4. Operating platform, 5. Bottom reinforcement of slab, 6. Top reinforcement of slab, 7. Top chord reinforcement of truss.

[0034] Example A construction method for simultaneously inserting beam and slab reinforcement into floor decking without removing bottom formwork is described in the following flowchart. Figure 1 As shown, it includes the following steps: S1. Erection of support frame: Before erecting the support frame, lay out the main control line of the building, the edge line of the beam structure, and the 300mm wide formwork inspection line according to the design drawings and mark them. Then, erect the full-span formwork frame according to the support frame positions determined by the layout lines.

[0035] S2. Installation of beam formwork and floor joists: When installing beam formwork, first install the bottom formwork, and then install the side formwork after ensuring it is level and vertical. For beams with a small cross-sectional height, close the formwork on both sides of the beam simultaneously, and then tie the beam reinforcement. For beams with a large cross-sectional height, choose one of the following construction methods: first lay the bottom slab of the beam, then tie the beam reinforcement before closing the side formwork; or after the beam formwork is installed, tie the beam reinforcement on the floor slab, then hoist the whole beam into place, and finally align it to ensure the quality of the beam reinforcement.

[0036] After the beam formwork is installed, the floor joists are installed. Before installation, the single top support is leveled and the diagonal of the floor slab is checked. If everything is correct, the floor joists are installed. During installation, they should be laid out in parallel one by one, temporarily fixed with pins first, and then the pins are tightened all at once. After all the floor joists are installed, the flatness and the installation elevation of the floor are measured with a level. If there are any deviations, they are corrected by adjusting the supports of the formwork system until the overall flatness and corresponding elevation are achieved. Vertical supports are installed at the bottom of the intersections of the floor joists. The spacing between adjacent vertical supports should generally not exceed 1.2m. This makes the floor joists in each span relatively densely distributed, ensuring the stability of the supports and avoiding large areas of suspension in each span, thus ensuring the safety of construction workers.

[0037] S3. Floor decking is installed in sections with beam and slab reinforcement bars inserted simultaneously: S3.1 Construction Zoning: Divide the beam spans within the floors to be installed into the first batch of beam spans according to the order of floor slab installation. 1 and the second batch of installed beams span 2, such as Figure 2 As shown, the shaded area represents the first batch of installed beam span 1, and the blank area represents the second batch of installed beam span 2. The first batch of installed beam spans 1 and the second batch of installed beam spans 2 are alternately distributed. During construction, the floor decking is installed alternately across the alternate beam spans, that is, the floor decking within one beam span is laid first, and the four beam spans adjacent to that beam span are not laid yet. The specific laying method is as follows: Figure 2 As shown: The floor decking for the second span of the first horizontal row is constructed sequentially from top to bottom and from left to right. A single-slab hoisting method is used to hoist the floor decking, ensuring each slab is aligned in the same direction. After the floor decking for the second span is installed, the same method is used to construct the floor decking for the fourth span of the first horizontal row, continuing until the first batch of beam spans 1 in the first horizontal row is laid. Then, the floor decking for the first batch of beam spans 1 in each subsequent horizontal row is laid sequentially. Finally, the floor decking for the second batch of beam spans 2 is laid according to the installation sequence.

[0038] In other embodiments, the construction sequence of each first batch of installed beam span 1 can be adjusted according to the actual situation, or they can be constructed simultaneously.

[0039] S3.2 Installation of the first batch of floor decking in beam span 1 and the interlacing and binding of beam reinforcement and bottom reinforcement 5: Lay the floor decking for the first batch of beam span 1 according to the laying method in step S3.1. After laying, as follows... Figure 4 As shown, the construction workers stand on the adjacent operating platform 4, which is formed by the second batch of installed beam span 2 and beam formwork, to first lay and tie the beam reinforcement. Then, on the operating platform 4, they insert the bottom reinforcement 5 of the slab into the floor deck through the gaps on the side of the beam reinforcement and tie it in place. The operation is simple, safe, and has high construction efficiency.

[0040] S3.3 Installation of the first batch of beam span 1 inner slab reinforcement 6 and additional reinforcement: The slab reinforcement 6 is inserted into the floor deck according to the construction method of the bottom reinforcement 5, and tied and fixed with the truss intersection in the floor deck. The tying points of the two adjacent rows are staggered to avoid the bottom reinforcement 5 from tilting and deforming. Then the additional reinforcement is laid and tied.

[0041] like Figure 5 As shown, when constructing the slab reinforcement 6 and the additional reinforcement, attention should be paid to their relative positions. The slab reinforcement 6 is located below the truss top chord reinforcement 7, and the additional reinforcement is at the same height as the truss top chord reinforcement 7 to ensure sufficient reinforcement cover thickness.

[0042] like Figure 6 As shown, when the beam is a side support beam, the ends of the top reinforcement 6 and the bottom reinforcement 5 near the side support beam are both inserted into the side support beam for anchorage, extending at least to the middle of the beam. The anchorage end of the top reinforcement 6 is also bent to ensure the stability of the side support beam joint.

[0043] S3.4~S3.5, during the installation of the floor decking within span 2 of the second batch of installation beams, the floor decking should be laid according to the construction sequence in step S3.1, such as... Figure 3As shown, however, within each beam span, along the installation sequence of the floor decking, a pre-installation position 3 for the last floor decking is reserved at the initial position or end and will not be laid temporarily. The specific laying method is as follows: Figure 3 As shown: the floor decking slabs in the third span of the first horizontal row are laid in a top-to-bottom installation sequence, with a pre-installation position 3 reserved at the bottommost end for the last floor decking slab; the floor decking slabs in the second span of the second horizontal row are laid in a left-to-right installation sequence, with a pre-installation position 3 reserved at the rightmost end for the last floor decking slab. In other embodiments, the laying sequence of floor decking slabs within each beam span can be adjusted according to the actual situation, such as starting construction from the middle of the beam span towards both ends, reserving a pre-installation position 3 for the last floor decking slab at either end.

[0044] Then, the bottom reinforcement 5 and the top reinforcement 6 are inserted from the pre-installation position 3 into the already laid floor deck, and the ends of the bottom reinforcement 5 and the top reinforcement 6 near the pre-installation position 3 are completely inserted into the installed floor deck. Then, the last floor deck is installed at the pre-installation position 3, and the bottom reinforcement 5 and the top reinforcement 6 are moved to the pre-installation position 3 so that they are inserted into the last floor deck and tied and fixed. Then, the auxiliary reinforcement is laid and tied.

[0045] S4. Concrete Pouring: After the floor deck and steel reinforcement are inspected and accepted, the bottom formwork of the floor deck is moistened with water. Then, the concrete pumping pipe support is placed inside the beam formwork to start concrete pouring. During pouring, the concrete is spread from the beam formwork to the surrounding area. After the concrete is poured, it should be cured in time for no less than 14 days.

[0046] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A construction method for simultaneously inserting reinforcing bars into beams and slabs during the installation of floor decking without removing bottom formwork, characterized in that: Includes the following steps: S1. Erection of support frame; S2. Installation of beam formwork and floor joists; S3. Floor decking is installed in sections with beam and slab reinforcement bars inserted simultaneously: S3.1 Construction Zoning: The beam spans in the floors to be installed are divided into the first batch of installation beam spans and the second batch of installation beam spans according to the order of installation of the floor decking. The first batch of installation beam spans and the second batch of installation beam spans are distributed alternately. S3.2 Installation of floor decking within the first batch of beam spans and interlacing and binding of beam reinforcement and slab bottom reinforcement: After the floor decking within the first batch of beam spans is laid, the construction personnel stand at the adjacent second batch of beam spans to first lay and bind the beam reinforcement, and then interlac and bind the slab bottom reinforcement. S3.3 Installation of the first batch of reinforcement bars and additional reinforcement bars on the inner slab surface of the beam span; S3.4 Second batch of beam span floor decking installation: During installation, reserve a pre-installation position for the last floor decking at any end of each beam span; S3.

5. First, lay the bottom reinforcement and top reinforcement of the slab within the span of the second batch of installed beams. Then, install the last floor deck slab at the pre-installation position. Next, adjust the position of the bottom reinforcement and top reinforcement and tie them in place. Finally, lay and tie the additional reinforcement. S4. Concrete pouring; In steps S3.2 and S3.3, the bottom reinforcement and top reinforcement of the slab are inserted into the floor deck by construction workers through the gaps on the side of the beam reinforcement near the second batch of installed beam spans. In step S3.5, the bottom reinforcement and top reinforcement of the slab are inserted into the floor deck from the pre-installation position, and the ends of the bottom reinforcement and top reinforcement near the pre-installation position are completely inserted into the installed floor deck. In step S3.5, after the last floor deck slab is installed at the pre-installation position for each span of the second batch of installed beams, the bottom reinforcement and top reinforcement of the slab are moved to the pre-installation position so that they are inserted into the last floor deck slab and tied and fixed.

2. The construction method for synchronously inserting beam and slab reinforcement into floor decking without removing bottom formwork, as described in claim 1, is characterized in that: In step S3.2, the slab reinforcement is distributed below the upper chord reinforcement of the truss, and the additional reinforcement is at the same height as the upper chord reinforcement of the truss.

3. The construction method for synchronously inserting beam and slab reinforcement into floor decking without removing bottom formwork, as described in claim 2, is characterized in that: In step S3.3, the slab reinforcement bars and the truss intersection of the floor deck are tied together, and the tying points of adjacent rows are staggered.

4. The construction method for synchronously inserting beam and slab reinforcement into floor decking without removing bottom formwork, as described in claim 3, is characterized in that: In step S3, when the joint between two adjacent floor slabs within the same beam span is greater than 2mm, sealing material is used to seal it.

5. The construction method for synchronously inserting beam and slab reinforcement into floor decking without removing bottom formwork, as described in claim 4, is characterized in that: In step S2, for beams with a small cross-sectional height, the formwork on both sides of the beam is closed simultaneously, and then the beam reinforcement is tied. For beams with an excessively large cross-sectional height, one of the following construction methods is selected: first lay the bottom slab of the beam, tie the beam reinforcement, and then close the side formwork; or after the beam formwork is installed, tie the beam reinforcement on the floor slab, then hoist the whole beam into place, and finally make corrections.

6. The construction method for synchronously inserting beam and slab reinforcement into floor decking without removing bottom formwork, as described in claim 5, is characterized in that: In step S2, vertical supports are provided at the bottom of the intersection of the floor joists, and the spacing between the vertical supports is no more than 1.2m.

Images