Construction method for supplementing concrete floating plate after main body structure construction is completed

Abstract

The invention relates to the technical field of floating plate building construction, and discloses a construction method for supplementing a concrete floating plate after main body structure construction, which comprises the following steps: S1, construction preparation: determining the length of an angle steel tripod according to the overhanging length of the concrete floating plate, the method comprises the following steps of S1, cutting by adopting a cutting tool, polishing a port after cutting, and then manufacturing an angle steel tripod by welding angle steel, S2, mounting the angle steel tripod, S3, mounting a batten and a template, S4, mounting reinforcing steel bars and pouring concrete, and S6, performing quality inspection and treatment. The angle steel triangular frame is adopted to replace a formwork support, the remarkable advantages are achieved, the tedious steps of erecting a protection frame and the formwork support are omitted, manpower and material resource input is reduced, the construction cost is greatly reduced due to the fact that the angle steel triangular frame can be recycled for multiple times, meanwhile, the construction efficiency is improved, and a powerful guarantee is provided for smooth proceeding of a project; the method has high practical value and economic benefit.

Description

Technical Field

[0001] The invention relates to the technical field of floating slab building construction technology, and in particular to a construction method for supplementing a concrete floating slab after the main structure construction is completed. Background Art

[0002] In the process of high-rise building construction, it is often found that after the main structure is completed and the supporting formwork and protective frame supporting the main structure are dismantled, it is found that some concrete floating slabs have not been constructed or some special needs require additional concrete floating slabs. Due to the high height of the concrete floating slab, the cost and time spent on setting up the supporting formwork and operating frame for the construction of the concrete floating slab are greatly increased. In addition, if the height of the independent concrete floating slab is high, the construction safety risk will also increase accordingly.

[0003] In view of such situations, how to reduce safety risks and complete the construction of concrete floating slabs at a relatively low cost is a technical problem to be solved by those skilled in the art. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a construction method for supplementing a concrete floating slab after the main structure is constructed, thereby solving the problem.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A construction method for supplementing a concrete floating slab after the main structure is completed, comprising the following steps: S1. Construction preparation: Determine the length of the angle steel tripod according to the cantilever length of the concrete floating slab, and the length of the angle steel tripod is longer than the cantilever length of the concrete floating slab. Then use a steel ruler to accurately measure and mark the required angle steel length, use a cutting tool to cut, and grind the end after cutting. Then make the angle steel tripod by welding the angle steel; S2. Installing the angle steel tripod: The construction personnel operate the self-propelled scissor-type aerial work vehicle on the floor, and fix the angle steel tripod on the concrete side beam with expansion bolts through the operating platform on the self-propelled scissor-type aerial work vehicle; S3. Install the wood and formwork: Install the wood on the angle steel tripod and fix it with wire or nails. Then lay the formwork on the wood and fix the formwork to the wood with nails. S4. Steel bar installation and concrete pouring: Install concrete floating slab steel bars according to the design drawings. After the steel bar installation is completed, the personnel will pour concrete for the concrete floating slab on the floor. During the template installation, steel bar tying and concrete pouring, lifelines will be set at the edge, and the construction personnel will wear safety belts to work; S5. Removal of formwork, timber and angle steel tripods: Use a self-propelled scissor-type aerial work vehicle to remove the formwork, timber and angle steel tripods span by span on the next floor; S6. Quality inspection and treatment: Check the appearance quality of the demolished parts. If cracks are found, fill the cracks and damaged parts with repair materials, then scrape the surface flat and make the repair materials slightly higher than the concrete surface. After it solidifies, grind it to make it level with the surrounding concrete surface.

[0006] Preferably, the angle steel tripod in S1 is made by welding 50*50*5mm angle steels. The direct welding between angle steels should be full welded, and the weld height should be ≥5mm. The length of the angle steel triangular bracket should be longer than the cantilever length of the concrete floating slab by more than 100mm.

[0007] Preferably, the installation spacing of the angle steel tripod on the concrete side beam in S2 is 800-1000 mm, and the angle steel tripod is fixed to the structural beam with three M10 expansion bolts.

[0008] Preferably, the horizontal spacing between the wooden blocks on the angle steel in S3 is 100 mm.

[0009] Preferably, the embedded depth of the reinforcement bars of the concrete floating slab in S4 is ≥15d, and the lifeline is convenient for construction workers to wear safety belts, and construction workers are strictly prohibited from standing on the angle steel tripod to operate.

[0010] Preferably, the self-propelled scissor-type aerial work vehicle in S5 is equipped with the tools required for dismantling, and the dismantling is performed by dismantling the formwork, wooden planks and angle steel tripods in sequence with adjacent support points as one span.

[0011] Preferably, the repair material in S6 includes epoxy resin putty and cement mortar, the epoxy resin putty is used for narrower cracks and small-area damage, and the cement mortar is used for damage with a slightly larger area and shallower depth, and the cement mortar and the original cast concrete are the same type of mud.

[0012] The present invention provides a construction method for supplementing a concrete floating slab after the main structure is completed. It has the following beneficial effects: 1. The present invention has significant advantages by adopting angle steel tripods to replace the formwork frames. It not only eliminates the tedious steps of setting up protective frames and formwork frames, reducing manpower and material investment, but also because it can be used repeatedly, it greatly reduces construction costs and improves construction efficiency, providing a strong guarantee for the smooth progress of the project, and has high practical value and economic benefits.

[0013] 2. The present invention uses a self-propelled scissor-type aerial work vehicle to perform operations. The protective railing safety facilities it is equipped with eliminate the steps of setting up protective frames and formwork frames, greatly reducing the time of aerial operations and reducing the safety risks of construction workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a flow chart of a construction method for supplementing a concrete floating slab after the main structure construction is completed, as proposed by the present invention; Figure 2 This is a schematic diagram of the angle steel tripod structure of the present invention; Figure 3 It is a schematic diagram of the installation of the angle steel tripod of the present invention; Figure 4 The figure is a schematic diagram of the installation of the concrete floating slab wood and the formwork of the present invention.

[0015] Among them, 1. Angle steel tripod; 2. Expansion bolts; 3. Self-propelled scissor-type aerial work vehicle; 4. Operating platform; 5. Wooden planks; 6. Templates. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Please see attached Figure 1 -Attached Figure 4 The embodiment of the present invention provides a construction method for supplementing a concrete floating slab after the main structure is completed, comprising the following steps: S1. Construction preparation: Determine the length of the angle steel tripod 1 according to the length of the concrete floating slab, and the length of the angle steel tripod 1 is higher than the cantilever length of the concrete floating slab. Then use a steel ruler to accurately measure and mark the required angle steel length, use a cutting tool to cut, and grind the end after cutting. Then, weld the angle steel to make the angle steel tripod 1; S2. Installing the angle steel tripod: The construction personnel operate the self-propelled scissor-type aerial work vehicle on the floor, and fix the angle steel tripod 1 on the concrete side beam through the expansion bolts 2 through the operating platform 4 on the self-propelled scissor-type aerial work vehicle 3; S3, installing the wood and formwork: installing the wood 5 on the angle steel tripod 1 and preliminarily fixing it with wire or nails, then laying the formwork 6 on the wood 5, and fixing the formwork 6 and the wood 5 with nails to firmly fix the formwork 6; S4, steel bar installation and concrete pouring: install concrete floating slab steel bars according to the design drawings. After the steel bar installation is completed, the personnel will pour the concrete of the concrete floating slab on the floor. When installing the formwork 6, tying the steel bars and pouring the concrete, a lifeline will be set at the edge position; S5, dismantling of formwork, wood and angle steel tripod: on the next floor, use a self-propelled scissor-type aerial work vehicle 3 to dismantle the formwork 6, wood 5 and angle steel tripod 1 span by span; S6. Quality inspection and treatment: Check the appearance quality of the demolished parts. If cracks are found, fill the cracks and damaged parts with repair materials, then scrape the surface flat and make the repair materials slightly higher than the concrete surface. After it solidifies, grind it to make it level with the surrounding concrete surface.

[0018] Specifically, the length of the angle steel tripod 1 is determined according to the length of the concrete floating slab in S1 in order to ensure that the tripod and the floating slab are closely matched in size. This precise matching is the basis for the smooth progress of subsequent construction, because only when the size is appropriate can the angle steel tripod 1 play the best effect in supporting the floating slab, avoiding installation difficulties or structural instability caused by size differences. At the same time, the cut ports are polished mainly to remove burrs, iron oxide and other impurities at the ports. The polished ports have a smooth surface and can fit closely with other angle steels in the subsequent welding process, thereby improving the welding quality. The angle steel is made into the angle steel tripod 1 by welding, and the stability principle of the angle steel tripod 1 is utilized. As a supporting structure, it can effectively bear the weight and external load of the floating slab, transfer the load to the concrete side beam, and provide stable support for the floating slab. In S2, the construction workers operate the self-propelled scissor-type aerial work vehicle 3 on the floor. In the construction of high-rise buildings, the floating slab is often at a high position. The self-propelled scissor-type aerial work vehicle 3 is equipped with safety facilities such as protective railings, and the steps of setting up protective frames and formwork frames are eliminated, which greatly reduces the time of high-altitude operations and reduces the safety risks of construction workers. The angle steel tripod 1 is fixed to the concrete side beam with expansion bolts 2, which can meet the requirements of reliably installing the angle steel tripod 1 on the side beam in various complex high-rise building structures, creating good conditions for the subsequent concrete floating slab construction, and ensuring the versatility and adaptability of the construction method; In S3, wooden planks 5 are installed on the angle steel tripod 1. The wooden planks 5 serve as an intermediate medium to transfer the load of the concrete floating slab to the angle steel tripod 1 more evenly, thereby preventing the angle steel tripod 1 from being deformed or damaged due to excessive stress locally, thereby improving the bearing capacity of the entire supporting structure and ensuring the stability of the floating slab structure. Through the precise laying of the template 6, it can be ensured that the concrete floating slab meets the expectations of the architectural design after forming, meets the requirements of architectural function and aesthetics, and lays a foundation for the overall quality of the building. During the pouring process of concrete in S4, the concrete densely fills all spaces in the formwork 6 and is in full contact with the steel bars. The fluidity of the concrete enables it to wrap around the steel bars, forming a reinforced concrete structure after hardening, and evenly transferring the force of the steel bars to the entire structure, so that the concrete floating slab can effectively resist various external forces. Whether it is a local concentrated load or an overall distributed load, it can be carried and transmitted through the synergistic effect of the overall structure, ensuring the safety and stability of the structure. When performing edge operations such as formwork 6 installation, steel bar tying and concrete pouring, setting up a lifeline is an important safety protection measure. There is a greater risk of falling at the edge, and construction workers may face danger due to accidental slips, falls or external force impacts during operation. The lifeline provides a reliable safety guarantee for construction workers. Construction workers can hang their safety belts on the lifeline In S5, a self-propelled scissor-type aerial work vehicle 3 is used to perform demolition operations on the next floor, providing a stable and safe working platform for construction workers. Demolition operations, especially in high-rise buildings, involve greater risks, such as falling from heights, being hit by objects, etc. The working platform of the self-propelled scissor-type aerial work vehicle 3 is equipped with safety facilities such as guardrails, and the stability of the vehicle itself can reduce the shaking caused by operations, thereby protecting the lives of construction workers. The safe span-by-span demolition gradually adjusts the stress on the structure. Each time a span is demolished, the internal force of the structure will be redistributed to the adjacent undemolished parts, thereby maintaining the stability of the entire building structure during the demolition process and ensuring the safe progress of the demolition work. At the same time, this orderly demolition method improves the recovery and reuse rate of materials, and the angle steel tripod 1 after demolition can also be used repeatedly, reducing construction costs and shortening the construction period of the concrete floating slab.

[0019] In S6, the appearance quality inspection of the demolished parts is an important part of quality control. The demolition work may cause damage to the concrete surface. Through careful observation, problems such as cracks and damage can be discovered in time. The quality of the concrete floating slab is directly related to the safety, durability and aesthetics of the building. Early detection of problems can prevent the problems from worsening. At the same time, the filled cracks enable the concrete structure to work better together when bearing loads, reduce stress concentration, ensure the integrity of the structure, and maintain the mechanical properties of the concrete floating slab.

[0020] Please see attached Figure 2 In S1, the angle steel tripod 1 is made of 50*50*5mm angle steel. The direct welding between angle steels should be full welding, and the weld height should be ≥5mm. The length of the angle steel tripod 1 should be 100mm longer than the cantilever length of the concrete floating slab.

[0021] Specifically, 50*50*5mm angle steel is selected to make the angle steel tripod 1, which has sufficient cross-sectional size and strength. In the supporting structure of the concrete floating slab, the angle steel needs to bear the dead weight and live load from the floating slab. The larger cross-sectional size can provide a larger bearing area and moment of inertia, thereby improving the bending, shear and compression resistance of the angle steel. The angle steels are fully welded with a weld height of ≥5mm to ensure the connection strength between the angle steels, so that the weld can effectively transfer the internal force between the angle steels, ensuring that the various rods of the tripod work together as a whole when subjected to force. The length of the angle steel triangle bracket is higher than the cantilever length of the concrete floating slab by 100mm, which can provide more sufficient support, form an effective support range, and transfer the load to the concrete side beam more evenly.

[0022] Please see attached Figure 1 and attached Figure 2 In S2, the installation spacing of the angle steel tripod 1 on the concrete side beam is 800-1000mm, and the angle steel tripod 1 is fixed to the structural beam with three M10 expansion bolts 2.

[0023] Specifically, the installation spacing of the angle steel tripod 1 on the concrete side beam is set to 800-1000mm, so that the weight of the floating plate and the load it bears can be evenly distributed on the concrete side beam, ensuring that the concrete side beam is evenly stressed over the entire length, thereby maintaining the structural stability of the side beam, and the arrangement of the three M10 expansion bolts 2 can better adapt to the force transfer between the angle steel tripod 1 and the structural beam, thereby improving the bearing capacity and stability of the entire structural system.

[0024] Please see attached Figure 4 , the horizontal spacing between the wooden squares 5 on the S3 angle steel is 100mm.

[0025] Specifically, the spacing of the wooden squares 5 laid flat is set to 100 mm on the angle steel, mainly to more effectively disperse the load transmitted from the concrete floating slab, help avoid excessive local force on the wooden squares 5, and prevent the wooden squares 5 from excessive deformation or damage due to local pressure concentration. At the same time, it also ensures that the entire support system can stably bear the weight of the floating slab, and further evenly transfer the load to the angle steel tripod 1, thereby improving the bearing capacity of the entire support structure.

[0026] Please see attached Figure 4 In S4, the depth of steel bar embedding of concrete floating slab is ≥15d. The lifeline is convenient for construction workers to wear safety belts. It is strictly forbidden for construction workers to stand on the angle steel tripod 1 to operate.

[0027] Specifically, it is stipulated that the embedded depth of the concrete floating slab steel bars shall be ≥15d (d is the diameter of the steel bar) to ensure the reliability of the anchorage of the steel bars in the concrete structure. Sufficient embedded depth can enable the steel bars to obtain sufficient anchoring force in the concrete, so that the steel bars will not be pulled out of the concrete or slip when subjected to tension, pressure and shear forces. By planning the construction requirements of the construction workers through lifelines, the personal safety of the construction workers in dangerous working environments is guaranteed, and the construction can be carried out safely and orderly.

[0028] Please see attached Figure 2 -Attached Figure 4 In S5, the self-propelled scissor-type aerial work vehicle 3 is equipped with the tools required for dismantling, and the template 6, the wooden square 5 and the angle steel tripod 1 are dismantled in sequence with the distance between adjacent support points as one span.

[0029] Specifically, the operating platform 4 on the self-propelled scissor-type aerial work vehicle 3 is equipped with the tools required for demolition, which can ensure the continuity and efficiency of the demolition work. A variety of tools are needed to remove the formwork 6, wooden beams 5 and angle steel tripod 1. The formwork 6, wooden beams 5 and angle steel tripod 1 are removed in sequence with the span between adjacent support points as one span, so that the force on the structure can be gradually adjusted. Each time a span is removed, the internal force of the structure will be redistributed to the adjacent undemolished parts, thereby maintaining the stability of the entire building structure during the demolition process and ensuring the safe progress of the demolition work.

[0030] Please see attached Figure 4 The repair materials in S6 include epoxy resin putty and cement mortar. Epoxy resin putty is used for narrow cracks and small-area damage, and cement mortar is used for damage with a slightly larger area and shallower depth. The cement mortar is the same type of mud as the original poured concrete.

[0031] Specifically, epoxy resin putty is used to repair narrow cracks and small-area damage. It has good adhesion and can tightly bond with the concrete surface. It can deeply penetrate and fill narrow cracks, restore the integrity of the concrete structure, and prevent further expansion of the cracks. For small-area damage, it can firmly bond to the damaged area to form a high-strength repair layer, ensuring the durability and stability of the repair. Cement mortar is used to repair damage with a slightly larger area and shallower depth, and it is the same type of mud as the original poured concrete. Cement mortar can better bond with the original concrete to form an integral structure, ensuring the stability and durability of the repaired structure.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for supplementing a concrete floating slab after the main structure is completed, characterized in that: The following steps are involved: S1. Construction preparation: Determine the length of the angle steel tripod according to the cantilever length of the concrete floating slab, and the length of the angle steel tripod is longer than the cantilever length of the concrete floating slab. Then use a steel ruler to accurately measure and mark the required angle steel length, use a cutting tool to cut, and grind the end after cutting. Then make the angle steel tripod by welding the angle steel; S2. Installing the angle steel tripod: The construction personnel operate the self-propelled scissor-type aerial work vehicle on the floor, and fix the angle steel tripod on the concrete side beam with expansion bolts through the operating platform on the self-propelled scissor-type aerial work vehicle; S3. Install the wood and formwork: Install the wood on the angle steel tripod and fix it with wire or nails. Then lay the formwork on the wood and fix the formwork to the wood with nails. S4. Steel bar installation and concrete pouring: Install concrete floating slab steel bars according to the design drawings. After the steel bar installation is completed, the personnel will pour concrete for the concrete floating slab on the floor. During the template installation, steel bar tying and concrete pouring, lifelines will be set at the edge, and the construction personnel will wear safety belts to work; S5. Removal of formwork, timber and angle steel tripods: Use a self-propelled scissor-type aerial work vehicle to remove the formwork, timber and angle steel tripods span by span on the next floor; S6. Quality inspection and treatment: Check the appearance quality of the demolished parts. If cracks are found, fill the cracks and damaged parts with repair materials, then scrape the surface flat and make the repair materials slightly higher than the concrete surface. After it solidifies, grind it to make it level with the surrounding concrete surface.

2. A construction method for supplementing a concrete floating slab after the main structure construction is completed according to claim 1, characterized in that: The angle steel tripod in S1 is made by welding 50*50*5mm angle steel. The direct welding between angle steels should be full welded, and the weld height should be ≥5mm. The length of the angle steel triangular bracket should be longer than the cantilever length of the concrete floating slab by more than 100mm.

3. The construction method of supplementing the concrete floating slab after the main structure construction is completed according to claim 1, characterized in that: The installation spacing of the angle steel tripod on the concrete side beam in S2 is 800-1000mm, and the angle steel tripod is fixed to the structural beam with three M10 expansion bolts.

4. The construction method of supplementing the concrete floating slab after the main structure construction is completed according to claim 1, characterized in that: The horizontal spacing between the wooden blocks on the angle steel in S3 is 100 mm.

5. The construction method of supplementing the concrete floating slab after the main structure construction is completed according to claim 1, characterized in that: The embedded reinforcement depth of the concrete floating slab in S4 is ≥15d, and the lifeline is convenient for construction workers to wear safety belts. It is strictly forbidden for construction workers to stand on the angle steel tripod to operate.

6. The construction method of supplementing the concrete floating slab after the main structure construction is completed according to claim 1, characterized in that: The self-propelled scissor-type aerial work vehicle in S5 is equipped with the tools required for demolition. The demolition is carried out by dismantling the formwork, wooden squares and angle steel tripods in sequence with the span between adjacent support points as one span.

7. The construction method of supplementing the concrete floating slab after the main structure construction is completed according to claim 1, characterized in that: The repair material in S6 includes epoxy resin putty and cement mortar. The epoxy resin putty is used for narrow cracks and small-area damage, and the cement mortar is used for damage with a slightly larger area and shallower depth. The cement mortar and the original poured concrete are the same type of mud.

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