Concrete pouring construction method for narrow space of medical building

Abstract

The invention discloses a concrete pouring construction method for a narrow space of a medical building, and relates to the technical field of narrow space construction. A plurality of inflatable rubber air bags arranged side by side are laid on a top plate of a lower structure to form a supporting system, and corrugated steel tiles are laid on the tops of the inflatable rubber air bags to form a supporting system; the inflatable rubber air bag is inflated, the internal air pressure of the inflatable rubber air bag is maintained at the preset working air pressure in the concrete pouring and curing period, the upper concrete structure is poured on the corrugated steel tile, and after the upper concrete structure reaches the preset strength, the upper concrete structure is poured on the corrugated steel tile. The inflatable rubber air bag is deflated and drawn out from the narrow gap, and the supporting system and the bottom formwork are removed, so that a supporting component or a connecting piece is prevented from being permanently reserved in the structure, the space is released, and the long-term durability and the overall safety of the structure are ensured.

Description

Technical Field

[0001] This invention relates to the field of construction technology in confined spaces, and particularly to a method for concrete pouring construction in confined spaces of medical buildings. Background Technology

[0002] With the rapid development of urban construction and the in-depth development and utilization of underground space, there are increasingly more scenarios in building engineering that require the construction of concrete structures in extremely narrow spaces. Especially in projects such as underground parking garages, civil defense projects, subway tunnels, and urban integrated pipe corridors, it is often necessary to pour high-load concrete structures such as those supporting roads and fire lanes within a narrow area between existing structures on both sides. Traditional formwork support technology is mainly designed for conventional spaces, and the installation and dismantling of its support system require ample operating space. In recent years, to adapt to the needs of construction in narrow spaces, the industry has gradually developed technical solutions such as miniaturized support components and detachable formwork systems. However, these technical solutions still face many technical bottlenecks under multiple constraints such as extremely narrow spaces, high loads, and complete dismantling.

[0003] Currently, the conventional practice for concrete pouring in confined spaces is to use steel pipe scaffolding or steel support systems as formwork support. Construction workers first erect the support frame in the narrow space, then lay the formwork, tie the reinforcing steel, and pour the concrete. Once the concrete reaches its design strength, the support system is dismantled. However, traditional support systems cannot be completely dismantled in extremely narrow spaces (150-700mm). Residual support components or connectors remain permanently inside the structure, not only occupying valuable space but also potentially becoming weak points, affecting the structure's long-term durability and safety. Summary of the Invention

[0004] The main objective of this invention is to propose a concrete pouring construction method for narrow spaces in medical buildings, aiming to solve the technical problem that existing technologies cannot achieve complete demolition in extremely narrow spaces (150-700mm), and the remaining supporting components or connectors will be permanently left inside the structure, which not only occupies effective space, but may also become weak links in the structure, affecting the long-term durability and safety of the structure.

[0005] To achieve the above objectives, in a first aspect, the present invention proposes a concrete pouring construction method for narrow spaces in medical buildings, applicable to narrow gaps between the top slab of an existing lower structure and the upper concrete structure to be poured, wherein the height of the narrow gap is 150mm to 700mm, and the concrete pouring construction method includes the following steps:

[0006] Multiple inflatable rubber airbags arranged side by side are laid on the top plate of the lower structure to form a support system; A corrugated steel sheet is laid on top of the inflatable rubber airbag to form a bottom template for pouring the upper concrete structure; wherein the laying direction of the corrugated steel sheet is perpendicular to the length direction of the inflatable rubber airbag. Inflate the inflatable rubber airbag and maintain the internal air pressure of the inflatable rubber airbag at the preset working air pressure during concrete pouring and curing; The upper concrete structure is poured onto the corrugated steel sheet; After the upper concrete structure reaches the preset strength, the inflatable rubber airbag is deflated and extracted from the narrow gap, and the support system and the bottom formwork are removed.

[0007] In one embodiment, the preset working air pressure is not lower than the minimum working pressure value, which is 0.05 MPa.

[0008] In one embodiment, the step of inflating the inflatable rubber bladder and maintaining the internal air pressure of the inflatable rubber bladder at a preset working pressure during concrete pouring and curing includes: Inflate the inflatable rubber bladder and pour concrete. Within a preset time period for completing the pouring of the upper concrete structure, the real-time air pressure inside the inflatable rubber airbag is monitored at target intervals. When the real-time air pressure is lower than the preset working air pressure, an air replenishment operation is performed.

[0009] In one embodiment, the step of inflating the inflatable rubber bladder and pouring concrete includes: The multiple inflatable rubber airbags are divided into at least one control group, each group is connected to an air compressor, and each inflatable rubber airbag is equipped with an independent pressure gauge and valve for grouped air supply and independent monitoring.

[0010] In one embodiment, prior to the step of laying multiple inflatable rubber airbags arranged side by side on the top plate of the lower structure to form a support system, the method further includes: According to the pre-set construction data, the upper concrete structure to be poured is divided into multiple sequential construction sections; wherein, in each construction section, the steps of laying inflatable rubber airbags, laying corrugated steel tiles, inflating, pouring, and dismantling are carried out sequentially.

[0011] In one embodiment, a construction joint template is provided at the joint of any two adjacent construction sections, and the inner side of the construction joint template is coated with a retarder.

[0012] In one embodiment, the step of laying corrugated steel sheets on top of the inflatable rubber airbag to form the bottom formwork for pouring the upper concrete structure includes: At least two layers of corrugated steel sheets are laid along the arrangement direction of the inflatable rubber airbags; wherein adjacent corrugated steel sheets overlap by at least one crest in the laying direction and are fixedly connected by self-tapping screws.

[0013] In one embodiment, above both sides of the inflatable rubber airbag, Z-shaped steel members extending along its length are also provided. The Z-shaped steel members are fixedly connected to the corrugated steel sheet to limit the lateral displacement of the inflatable rubber airbag and prevent concrete from entering the airbag area.

[0014] In one embodiment, the preset strength is at least 3 days after the upper concrete structure is poured, and the compressive strength of the upper concrete structure reaches 40 MPa.

[0015] In one embodiment, after the step of deflating the inflatable rubber airbag and extracting it from the narrow gap and removing the support system and the bottom formwork after the upper concrete structure has reached a preset strength, the method further includes: Inspect the narrow gap between the top slab of the lower structure and the upper concrete structure to confirm that there are no remaining support or formwork components therein.

[0016] The technical solution of this invention applies a concrete pouring construction method to the narrow gap between the top slab of an existing substructure and the upper concrete structure to be poured. The height of the narrow gap is 150mm to 700mm. In use, multiple inflatable rubber airbags arranged side-by-side are laid on the top slab of the substructure to form a support system. Corrugated steel sheets are laid on top of the inflatable rubber airbags to form the bottom template for pouring the upper concrete structure. The inflatable rubber airbags are inflated, and the internal air pressure of the inflatable rubber airbags is maintained at a preset working pressure during concrete pouring and curing. The upper concrete structure is poured on the roof tiles. After the upper concrete structure reaches the preset strength, the inflatable rubber airbag is deflated and extracted from the narrow gap, and the support system and the bottom formwork are removed. This invention allows the inflatable rubber airbag to be inflated and deflated, enabling formwork and concrete pouring operations in narrow spaces. After the formwork and concrete pouring operations are completed, the formwork can be removed, preventing support components or connectors from being permanently left inside the structure, freeing up space, and ensuring the long-term durability and overall safety of the structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A flowchart of a concrete pouring construction method for narrow spaces in medical buildings provided by the present invention.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] In traditional, existing narrow-space concrete structure construction, conventional support systems cannot be completely removed due to insufficient operating space, resulting in support components or connectors being permanently left inside the structure. These remnants occupy usable space and form weak interfacial areas in the concrete matrix, making them prone to microcracks. Under environmental factors and loads, the material properties of the interfacial areas continue to degrade, thereby affecting the overall stability and long-term service performance of the structure.

[0024] For example, during construction in narrow gaps between existing structures and newly built fire lanes in urban subway tunnels, the gap height ranges from 150mm to 700mm. When steel pipe scaffolding is used as a support system, dismantling operations are hindered by space constraints, and some steel pipes and fasteners cannot be completely removed. Construction workers are forced to cut the remaining components, resulting in metal materials embedding inside the concrete structure, creating potential leakage paths and corrosion initiation zones.

[0025] This invention proposes a method for concrete pouring construction in narrow spaces of medical buildings.

[0026] Please see Figure 1 For ease of understanding, this method for concrete pouring in narrow spaces of medical buildings is applied to narrow gaps between the top slab of an existing lower structure and the upper concrete structure to be poured, wherein the height of the narrow gap is 150mm to 700mm, and the concrete pouring method includes the following steps: S100. Multiple inflatable rubber airbags arranged side by side are laid on the top plate of the lower structure to form a support system; S200. A corrugated steel sheet is laid on top of the inflatable rubber airbag to form a bottom template for pouring the upper concrete structure; wherein the laying direction of the corrugated steel sheet is perpendicular to the length direction of the inflatable rubber airbag. S300, Inflate the inflatable rubber airbag and maintain the internal air pressure of the inflatable rubber airbag at the preset working air pressure during concrete pouring and curing. S400. The upper concrete structure is poured on the corrugated steel sheet; S500. After the upper concrete structure reaches the preset strength, deflate the inflatable rubber airbag and pull it out of the narrow gap, and remove the support system and the bottom formwork.

[0027] Specifically, the concrete pouring construction method of this invention is applied to the construction of a narrow gap between the top slab of an existing substructure and the upper concrete structure to be poured. The height of the narrow gap ranges from 150 mm to 700 mm.

[0028] During construction, multiple inflatable rubber airbags arranged side-by-side are first laid on the top slab of the substructure to form a support system. These airbags can be manually moved to the construction area by construction workers and placed according to predetermined spacing and arrangement. For example, they can be laid in a single layer side-by-side, or the airbags can be arranged closely together according to actual load-bearing requirements. During installation, the alignment of the airbags can be ensured through simple positioning marks or visual inspection to guarantee the uniformity of subsequent support.

[0029] Corrugated steel sheets are laid on top of the inflatable rubber airbag to form the bottom formwork for pouring the upper concrete structure. The corrugated steel sheets are laid perpendicular to the length of the inflatable rubber airbag. A single layer of corrugated steel sheets can be laid on top of the inflatable rubber airbag, with the crests and troughs of the sheets perpendicular to the length of the airbag to provide a stable load-bearing surface. The steel sheets can be easily overlapped to form a continuous bottom formwork surface, ensuring no grout leakage during concrete pouring.

[0030] Inflate the rubber air bladders and maintain the internal pressure at the preset working pressure during concrete pouring and curing. Inflation can be performed via an air compressor connected to the inflation port of all air bladders. During inflation, the overall pressure can be monitored using a master pressure gauge, and inflation can be adjusted based on experience or preset values. During concrete pouring and curing, the air pressure can be checked periodically or irregularly by visual inspection or manual touch, and additional air can be added if insufficient pressure is detected to ensure the stability of the support system.

[0031] The upper concrete structure is poured onto the corrugated steel sheets. The concrete can be poured directly onto the pre-laid corrugated steel sheet bottom formwork by pumping or manual transport. During the pouring process, conventional vibration equipment can be used to ensure the compactness of the concrete and achieve the designed strength and quality.

[0032] After the upper concrete structure reaches the preset strength, the inflatable rubber airbags are deflated and extracted from the narrow gap, and the support system and bottom formwork are then removed. Once the concrete reaches the preset strength, the air inside the airbags can be released by opening the deflation valve. After deflation, the airbags will shrink significantly, at which point they can be manually pulled out of the narrow gap. The corrugated steel sheets can also be manually removed and recycled after the airbags are removed, thus achieving complete removal of the support system and bottom formwork without leaving any residual components.

[0033] In this embodiment, the concrete pouring method is applied to the narrow gap between the existing substructure slab and the upper concrete structure to be poured. The height of the narrow gap is 150mm to 700mm. During use, multiple inflatable rubber airbags arranged side-by-side are laid on the substructure slab to form a support system. Corrugated steel sheets are laid on top of the inflatable rubber airbags to form the bottom template for pouring the upper concrete structure. The inflatable rubber airbags are inflated, and the internal air pressure of the inflatable rubber airbags is maintained at a preset working pressure during concrete pouring and curing. The upper concrete structure is poured. After the upper concrete structure reaches the preset strength, the inflatable rubber airbag is deflated and extracted from the narrow gap, and the support system and the bottom formwork are removed. This invention allows the inflatable rubber airbag to be inflated and deflated, enabling the invention to perform formwork and concrete pouring operations in narrow spaces. After the formwork and concrete pouring operations are completed, the formwork can be removed, avoiding the permanent retention of support components or connectors inside the structure, freeing up space, and ensuring the long-term durability and overall safety of the structure.

[0034] In one embodiment, the preset working air pressure is not lower than the minimum working pressure value, which is 0.05 MPa.

[0035] In this embodiment, by specifying that the preset working air pressure is not lower than the minimum working pressure value, and setting the minimum working pressure value to 0.05 MPa, it is ensured that the inflatable rubber airbag maintains sufficient rigidity and support force when bearing the load during the pouring and curing of the upper concrete structure. This allows the inflatable rubber airbag to effectively and evenly transfer the weight of the upper concrete structure to the lower structure's top slab, preventing local deformation or overall subsidence of the corrugated steel sheet bottom formwork due to uneven stress or insufficient pressure. Simultaneously, the minimum working pressure value of 0.05 MPa provides a quantified safety guarantee, avoiding construction risks caused by insufficient experience or arbitrary air pressure settings, thereby ensuring the molding quality and construction safety of the upper concrete structure.

[0036] In one embodiment, step S300 includes: S310. Inflate the inflatable rubber airbag and pour concrete. S320. Within a preset time period after the completion of the upper concrete structure pouring, monitor the real-time air pressure inside the inflatable rubber airbag at target intervals. S330. When the real-time air pressure is lower than the preset working air pressure, perform air replenishment.

[0037] In this embodiment, a cyclical control strategy of continuous air pressure monitoring and air replenishment is introduced after initial inflation and concrete pouring. Within a preset time period after the completion of the upper concrete structure pouring, construction personnel or an automated system periodically monitor the real-time air pressure inside the inflatable rubber airbags at predetermined target intervals. If the monitored real-time air pressure falls below the preset working air pressure, it indicates that the support force may be insufficient. At this point, an air replenishment operation is immediately initiated to replenish gas into the airbags until the air pressure recovers to the preset working air pressure or above. This effectively solves the problem of insufficient support caused by air pressure decreasing over time in traditional methods, ensuring the stability and reliability of the support system throughout the construction and curing process. The inflatable rubber airbags continuously provide sufficient support force, preventing deformation or cracking of the upper concrete structure during solidification, thereby significantly improving construction quality and structural safety.

[0038] In one embodiment, step S310 includes: The multiple inflatable rubber airbags are divided into at least one control group, each group is connected to an air compressor, and each inflatable rubber airbag is equipped with an independent pressure gauge and valve for grouped air supply and independent monitoring.

[0039] Specifically, in actual construction, when a large number of inflatable rubber airbags need to be laid, if a uniform air supply and monitoring method is used, it may lead to inaccurate air pressure control, making it difficult to detect and deal with local airbag leakage or insufficient pressure in a timely manner, thereby affecting the pouring quality and construction efficiency of the upper concrete structure.

[0040] To address this, this application further proposes dividing multiple inflatable rubber airbags into at least one control group, with each group connected to an air compressor, and equipping each inflatable rubber airbag with an independent pressure gauge and valve for grouped air supply and independent monitoring. Dividing multiple inflatable rubber airbags into at least one control group means logically or physically dividing all used inflatable rubber airbags into several independent management units based on the actual conditions of the construction site, such as the division of construction sections, the density of airbag arrangement, or load-bearing requirements. For example, airbags within each construction section can be considered as a control group, or a certain number of adjacent airbags can be grouped into a control group. Group management helps improve the precision and efficiency of controlling a large number of airbags. Each group being connected to an air compressor means that each control group has an independent air compressor as its air source.

[0041] This is achieved by equipping each control group with an independent air compressor, or by splitting the output of a high-power air compressor into multiple channels, each independently controlled and connected to a control group. Each channel must have independent pressure regulation and shut-off valves to ensure independent air supply between groups. This aims to ensure that each control group's airbags receive a stable air source independently, preventing pressure interference between different groups. Equipping each inflatable rubber airbag with an independent pressure gauge and valve means that each inflatable rubber airbag is equipped with an independent pressure measuring device and airflow control device. The pressure gauge can be a mechanical pressure gauge that visually displays the internal air pressure of the airbag, or a digital pressure sensor that transmits pressure signals to the control system. The valve can be a ball valve for manual inflation and deflation, or an electric solenoid valve for remote or automated control. This configuration aims to achieve precise air pressure monitoring and independent air pressure regulation for each airbag, ensuring that each airbag maintains a preset working air pressure. Through the above configuration of grouped air supply and independent monitoring, refined management of the inflatable rubber airbag system can be achieved. Grouped gas supply ensures the independence and stability of the gas supply, preventing a single failure from affecting the whole system; independent monitoring ensures that the status of each airbag can be monitored in real time, making it easier to detect and deal with problems in a timely manner.

[0042] In this embodiment, a distributed and sophisticated air pressure control system is constructed by grouping inflatable rubber airbags and equipping each group with an independent air compressor. Each airbag is also equipped with an independent pressure gauge and valve. During inflation and concrete pouring, the air compressors of each control group operate independently, providing air to the airbags within their respective groups. Each airbag's independent pressure gauge monitors its internal pressure in real time, while independent valves allow for precise pressure adjustment of individual airbags. This ensures that each inflatable rubber airbag accurately maintains its preset working pressure throughout the entire construction area, providing uniform and stable support for the upper concrete structure. Even if a slight leak or pressure fluctuation occurs in one airbag, it can be detected promptly through its independent monitoring and control device, allowing for timely replenishment without affecting other airbags or the stability of the entire support system. This avoids the problems of uneven local pressure or fault propagation that can occur with traditional centralized air supply, significantly improving the reliability and stability of the support system.

[0043] In one embodiment, prior to step S100, the method further includes: S600. According to the preset construction data, the upper concrete structure to be poured is divided into multiple sequential construction sections; wherein, in each construction section, the steps of laying inflatable rubber airbags, laying corrugated steel tiles, inflating, pouring and dismantling are carried out sequentially.

[0044] In this embodiment, before pouring concrete in a confined space, the upper concrete structure to be poured is divided into multiple sequential construction sections according to pre-set construction data. Within each section, the steps of laying inflatable rubber airbags, laying corrugated steel sheets, inflating, pouring, and removing the sheets are performed sequentially. This segmented construction strategy breaks down the large-area concrete pouring task, which would normally be completed in one go, into multiple smaller, controllable sub-tasks. Once the concrete in one section is poured and reaches the preset strength, the inflatable rubber airbags and corrugated steel sheets can be removed and transferred to the next section for reuse, thus achieving the recycling of construction resources. This avoids the continuous occupation of large amounts of support and formwork materials during the entire large-area structure construction process, significantly reducing construction costs and material requirements. Simultaneously, since each section can be constructed and cured independently, the construction schedule can be arranged more flexibly, shortening the overall construction period and improving construction efficiency. This segmented, cyclical operation method effectively solves the problems of large resource consumption and long construction periods when pouring concrete in large-area confined spaces.

[0045] In one embodiment, a construction joint template is provided at the joint of any two adjacent construction sections, and the inner side of the construction joint template is coated with a retarder.

[0046] In this embodiment, by setting construction joint templates at the joints between adjacent construction sections and coating the inside of these templates with a retarder, the concrete surface in contact with the template is delayed in setting when the first construction section is poured due to the retarder's effect. When the second construction section is poured, it will come into contact with the still-hardened surface of the first section's concrete. This promotes chemical bonding and mechanical interlocking between the old and new concrete, resulting in a more continuous and uniform overall structure. This method effectively solves the problem of cold joint formation during segmented concrete pouring, ensuring good integrity and durability of concrete structures constructed in segments within confined spaces.

[0047] In one embodiment, step S200 includes: At least two layers of corrugated steel sheets are laid along the arrangement direction of the inflatable rubber airbags; wherein adjacent corrugated steel sheets overlap by at least one crest in the laying direction and are fixedly connected by self-tapping screws.

[0048] In this embodiment, by laying at least two layers of overlapping corrugated steel sheets on top of the inflatable rubber airbag, the overall rigidity and load-bearing capacity of the bottom formwork are significantly enhanced, enabling it to better withstand the load of wet concrete and effectively preventing deformation or deflection that may occur with single-layer formwork. Simultaneously, adjacent corrugated steel sheets overlap by at least one crest in the laying direction, ensuring the continuity and sealing of the formwork and effectively preventing concrete slurry leakage from the joints. The overlapping and stacked corrugated steel sheets are fixedly connected with self-tapping screws, further improving the overall stability and structural integrity of the formwork and preventing relative displacement between the steel sheets. The multi-layered, overlapping, and tightly secured corrugated steel sheet bottom formwork system, working in conjunction with the uniform support pressure provided by the inflatable rubber airbag, jointly constructs a highly stable, high-load-bearing, and well-sealed concrete pouring platform in a confined space. This allows for reliable pouring of the upper concrete structure in narrow gaps with limited height, ensuring its molding quality and dimensional accuracy, effectively overcoming the technical difficulties of traditional formwork in confined space construction, such as easy deformation and leakage.

[0049] In one embodiment, above both sides of the inflatable rubber airbag, Z-shaped steel members extending along its length are also provided. The Z-shaped steel members are fixedly connected to the corrugated steel sheet to limit the lateral displacement of the inflatable rubber airbag and prevent concrete from entering the airbag area.

[0050] In this embodiment, after laying inflatable rubber airbags on the top slab of the lower structure and then laying corrugated steel sheets on top to form a bottom template, to address the potential lateral expansion of the inflatable rubber airbags and leakage of concrete slurry during concrete pouring, this application further provides Z-shaped steel members extending along the length of the inflatable rubber airbags on both sides above the airbags. The Z-shaped steel members, fixedly connected to the corrugated steel sheets, form a stable lateral restraint structure. Specifically, the web or flange of the Z-shaped steel member is tightly fitted to the sidewall of the inflatable rubber airbag. When the inflatable rubber airbag expands under pressure, the Z-shaped steel member provides sufficient stiffness and support, effectively limiting its lateral displacement and maintaining the predetermined shape and support stability of the inflatable rubber airbag. Simultaneously, the fixed connection between the Z-shaped steel member and the corrugated steel sheets forms a continuous physical barrier above both sides of the inflatable rubber airbag, effectively preventing concrete slurry from seeping into the surrounding area of ​​the inflatable rubber airbag through the gaps or lateral voids between the corrugated steel sheets and the inflatable rubber airbag. The Z-shaped steel components, together with the inflatable rubber airbags and corrugated steel sheets, form a more stable and sealed bottom formwork support system, ensuring the quality of concrete pouring and creating conditions for the smooth recovery of the inflatable rubber airbags.

[0051] In one embodiment, the preset strength is at least 3 days after the upper concrete structure is poured, and the compressive strength of the upper concrete structure reaches 40 MPa.

[0052] In this embodiment, by explicitly defining the preset strength as at least 3 days after the completion of the upper concrete structure pouring and its compressive strength reaching 40 MPa, a clear and quantifiable judgment standard is provided for the support system and bottom formwork removal in the concrete pouring construction method in confined spaces. After the concrete pouring is completed, it is first ensured that at least 3 days of curing are carried out to provide the necessary time for early hydration and strength development of the concrete, avoiding insufficient strength due to too short a curing period. Based on this time, the compressive strength of the upper concrete structure must further reach 40 MPa, which is verified by conducting compressive strength tests on concrete test blocks. Only when both conditions are met simultaneously is the upper concrete structure considered to have reached sufficient load-bearing capacity, allowing for the safe deflation and extraction of the inflatable rubber airbags and the removal of the support system and bottom formwork. By setting a dual standard, combining time factors and actual strength indicators, the safety risks or construction delays that may arise from relying solely on experience or a single indicator are effectively avoided, ensuring the reliability and efficiency of the construction process.

[0053] In one embodiment, after step S500, the method further includes: S700. Inspect the narrow gap between the top plate of the lower structure and the upper concrete structure to confirm that there are no remaining support or formwork components therein.

[0054] In this embodiment, after the upper concrete structure is poured and reaches the preset strength, the support system composed of inflatable rubber airbags and corrugated steel sheets, as well as the bottom formwork, are deflated, removed, and dismantled. Furthermore, to ensure construction quality and structural safety, an inspection step for the narrow gap is introduced. This inspection step serves as the final quality control link in the entire construction process. Its operating principle is to proactively identify and correct any residue problems that may arise from the dismantling operation through systematic inspection activities. Specifically, after the support system and bottom formwork are removed, the internal space of the narrow gap is exposed. At this time, a comprehensive inspection of this space can promptly identify any possible remaining support or formwork components. Once residue is found, it can be cleaned immediately, thereby ensuring the complete unobstructed and cleanliness of the narrow gap. By closely linking step S700 with the aforementioned dismantling step, a closed-loop construction quality assurance mechanism is formed, effectively compensating for any blind spots and incompleteness that may exist in the dismantling operation, ensuring the integrity and reliability of the final structure.

[0055] Of course, in this embodiment, the following process can also be followed: clean the surface of the radiation room floor slab to avoid sharp objects, and prepare the three-way valve, pressure gauge, inflation equipment, and tensioning equipment for connecting the airbags. Depending on the amount of concrete poured each time, the construction time, and environmental requirements, the construction cannot be completed in one go; it needs to be done in stages, with construction joints dividing the construction areas. Based on the site conditions, environmental requirements, and concrete volume, the 90m long × 14m wide × 1m thick concrete fire-fighting road is divided into three zones, each with approximately 420m³ of concrete, and two vertical construction joints are provided. Z-shaped steel components, as part of the formwork, are connected and fixed to the corrugated steel sheet with bolts, which can shield the airbags from concrete, preventing concrete from falling into the airbags during subsequent pours. After the radiation room roof slab is completed, a concrete protective layer and waterproof coating need to be laid to meet the waterproofing requirements of the radiation room. The building structure is divided into upper and lower parts. Below the horizontal construction joint is the radiation room and concrete shear wall; above the construction joint is the fire access road. The radiation room includes components such as the roof slab and insulation board. The fire access road is supported by the concrete shear wall below. During the construction of the fire access road, side formwork needs to be erected. The inside of the formwork uses 12mm diameter steel bars connected to the bottom steel bars of the fire access road at 600mm intervals. The outside of the formwork uses 100×50mm timber fixed to the concrete piers outside the airbag area. At the same time, the formwork at the construction joint must be coated with a retarder to better bond the concrete poured in adjacent areas. Within 24 hours after the concrete is poured, the surface slurry of the concrete should be cleaned with a high-pressure water gun until the coarse aggregate is exposed. Before laying the airbags, the site must be cleaned. Connect the three-way valve to the rubber airbag, and the other end to the air compressor. The valve has functions of inflation, deflation, and pressure detection. Apply soap powder water evenly to the outside of the airbag three times to check for leaks. Arrange the airbags and number them in sequence. Group the airbags into groups of 15-20, each controlled by an air compressor. To ensure real-time monitoring of airbag pressure and the ability to inflate individual airbags when pressure is low, each airbag is individually equipped with a pressure gauge and valve, and connected to an air compressor according to its group. Inflate all airbags to 0.05-0.08 MPa. During subsequent operations, if the airbag pressure drops below 0.05 MPa, manually monitor the system and, if necessary, open the air compressor and inflate the corresponding airbag individually. Lay three layers of corrugated steel sheets (which offer better mechanical properties compared to flat sheets) on top of the airbags. The corrugated steel sheets are directly fixed with self-tapping screws to prevent displacement, and rubber washers are placed between the screws and the sheets. During installation, ensure the material is placed stably to avoid the edges of the corrugated steel sheets cutting into the airbags, and ensure at least one overlap between adjacent sheets. To ensure the bending resistance of the corrugated steel sheets, their overlap direction should be perpendicular to the direction of the airbags. To prevent screws from puncturing the airbag, the length of the screw protruding from the corrugated steel sheet must be less than the height of the corrugation. During installation, M4×10 (4mm diameter) steel strips should be used at the corrugation crests every 500mm. The corrugated steel sheets are fixed with screws (10mm in length). To prevent the airbags from shifting to both sides, Z-shaped iron plates need to be added to both sides after the corrugated steel sheets are laid. In addition, pads and reinforcing bars are laid on top of the corrugated steel sheets to raise the reinforcing bars of the fire road later and ensure the thickness of the reinforcing bar protective layer. Before pouring concrete, all debris should be cleaned up, and it should be ensured that the reinforcing bars are free of corrosion, grease, and concrete slurry overflow. The concrete strength grade is C45 / 20D, and on-site pump truck sampling is carried out. Each concrete delivery truck must be sampled twice for slump testing. The concrete delivery note must be checked according to the design requirements. A concrete diversion pipe is used to ensure that the free fall height of the concrete does not exceed 2.0m. Before pouring concrete, the air pressure of all airbags must be recorded to ensure that it reaches 0.05Mpa. During the concrete pouring and within two hours after the concrete is poured, the air pressure of the airbags is checked every 15 minutes. When vibrating the concrete, the vibrating end must not touch the rubber inflatable airbags. Before the concrete strength reaches 25Mpa (based on the test block pressure test results), the air pressure of the airbags must be checked every two hours. The air pressure must not be lower than 0.05 MPa throughout the process. If the air pressure is found to be lower than the limit, the airbag must be inflated separately. The support can be removed 4 days after the concrete is poured. At the same time, the formwork can also be removed according to the strength of the concrete. According to the test results, the concrete strength can reach 40 MPa after 3 days. Therefore, the airbag should be removed 3 days after the concrete is poured. After the concrete reaches the required strength, open the airbag valve to release the air and extract it. Immediately wash the surface with tap water to remove the concrete for reuse.

[0056] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the protection scope of the present invention.

Claims

1. A method for concrete pouring construction in narrow spaces of medical buildings, characterized in that, This method, applied to narrow gaps between the top slab of an existing substructure and the upper concrete structure to be poured, wherein the height of the narrow gap is 150mm to 700mm, includes the following steps in the concrete pouring construction: Multiple inflatable rubber airbags arranged side by side are laid on the top plate of the lower structure to form a support system; A corrugated steel sheet is laid on top of the inflatable rubber airbag to form a bottom template for pouring the upper concrete structure; wherein the laying direction of the corrugated steel sheet is perpendicular to the length direction of the inflatable rubber airbag. Inflate the inflatable rubber airbag and maintain the internal air pressure of the inflatable rubber airbag at the preset working air pressure during concrete pouring and curing; The upper concrete structure is poured onto the corrugated steel sheet; After the upper concrete structure reaches the preset strength, the inflatable rubber airbag is deflated and extracted from the narrow gap, and the support system and the bottom formwork are removed.

2. The concrete pouring construction method for narrow spaces in medical buildings as described in claim 1, characterized in that, The preset working air pressure is not lower than the minimum working pressure value, which is 0.05 MPa.

3. The concrete pouring construction method for narrow spaces in medical buildings as described in claim 2, characterized in that, The step of inflating the inflatable rubber bladder and maintaining the internal air pressure of the inflatable rubber bladder at a preset working pressure during concrete pouring and curing includes: Inflate the inflatable rubber bladder and pour concrete. Within a preset time period for completing the pouring of the upper concrete structure, the real-time air pressure inside the inflatable rubber airbag is monitored at target intervals. When the real-time air pressure is lower than the preset working air pressure, an air replenishment operation is performed.

4. The concrete pouring construction method for narrow spaces in medical buildings as described in claim 3, characterized in that, The step of inflating the inflatable rubber bladder and pouring concrete includes: The multiple inflatable rubber airbags are divided into at least one control group, each group is connected to an air compressor, and each inflatable rubber airbag is equipped with an independent pressure gauge and valve for grouped air supply and independent monitoring.

5. The concrete pouring construction method for narrow spaces in medical buildings as described in claim 4, characterized in that, Before the step of laying multiple inflatable rubber airbags arranged side by side on the top plate of the lower structure to form a support system, the method further includes: According to the pre-set construction data, the upper concrete structure to be poured is divided into multiple sequential construction sections; in each construction section, the steps of laying inflatable rubber airbags, laying corrugated steel tiles, inflating, pouring, and dismantling are carried out sequentially.

6. The concrete pouring construction method for narrow spaces in medical buildings as described in claim 5, characterized in that, Construction joint templates are installed at the joints of any two adjacent construction sections, and the inner side of the construction joint templates is coated with a retarder.

7. The method for concrete pouring construction in narrow spaces of medical buildings as described in any one of claims 1 to 5, characterized in that, The step of laying corrugated steel sheets on top of the inflatable rubber airbag to form the bottom formwork for pouring the upper concrete structure includes: At least two layers of corrugated steel sheets are laid along the arrangement direction of the inflatable rubber airbags; wherein adjacent corrugated steel sheets overlap by at least one crest in the laying direction and are fixedly connected by self-tapping screws.

8. The method for concrete pouring construction in narrow spaces of medical buildings as described in any one of claims 1 to 5, characterized in that, Above both sides of the inflatable rubber airbag, Z-shaped steel members extending along its length are also provided. The Z-shaped steel members are fixedly connected to the corrugated steel sheet to limit the lateral displacement of the inflatable rubber airbag and prevent concrete from entering the airbag area.

9. The method for concrete pouring construction in narrow spaces of medical buildings as described in any one of claims 1 to 5, characterized in that, The preset strength is defined as follows: at least 3 days after the completion of the pouring of the upper concrete structure, the compressive strength of the upper concrete structure reaches 40 MPa.

10. The concrete pouring construction method for narrow spaces in medical buildings as described in claim 9, characterized in that, After the upper concrete structure reaches the preset strength, the inflatable rubber airbag is deflated and extracted from the narrow gap, and the support system and the bottom formwork are removed. The method further includes: Inspect the narrow gap between the top slab of the lower structure and the upper concrete structure to confirm that there are no remaining support or formwork components therein.

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