Inflation core mold and working method thereof

Abstract

The invention relates to the technical field of plate girder pouring, in particular to an inflatable core mold and a working method thereof.The inflatable core mold comprises an end mold and a plate girder pedestal, the plate girder pedestal is provided with a core mold body and a steel bar frame, the upper side of the core mold body is provided with a PVC half pipe, the core mold body comprises an outer-layer air bag and an inner-layer air bag, the outer-layer air bag is divided into a plurality of independent air cavities, and the inner-layer air bag is divided into a plurality of outer-layer air cavities; the outer-layer air bag and the inner-layer air bag are connected with air valves; the steel bar frame comprises a top plate steel bar and a bottom plate steel bar, a drag hook bar is arranged on the upper side of the core mold, side molds are arranged on the two sides of the steel bar frame, a top supporting structure is arranged on the upper sides of the side molds, and the top supporting structure comprises a pressing lever, a rope sleeve and a tensioning structure; the PVC half pipe and the inflatable core mold support are combined, the PVC half pipe has certain rigidity, stable top reverse support can be provided for the core mold, buoyancy can be effectively resisted, and the deformation risk is reduced; the PVC half pipe can be taken out from the plate girder, so that the construction cost is reduced, and the quality of concrete in the cavity is convenient to observe.

Description

Technical Field

[0001] The present invention relates to the technical field of slab girder pouring, and particularly to an inflatable core mold and its working method. Background Art

[0002] Currently, traditional inflatable core molds on the market are gradually being replaced. On the one hand, because the inflatable core mold is relatively light in weight and has a large buoyancy force, if no fixing device is installed, problems such as floating and inconsistent installation heights are likely to occur, affecting the construction quality. On the other hand, the material of the core mold body itself has insufficient stiffness, and the bearing capacity is limited by the size of the core mold. It is difficult to control the inflation pressure. If the inflation is insufficient, the surface of the core mold is soft, resulting in great difficulty in positioning the core mold and extremely likely causing the thickness of the webs on both sides of the beam slab not to meet the design requirements. The alternative products mainly include steel, PVC, and high-density foam, etc.

[0003] However, in the prior art, for small-span hollow slab girders and small box girders, due to the small beam body structure and narrow internal space of the beam, it is still difficult to solve the problem of form removal using steel formwork and PVC formwork currently. The PVC pipes remain in the beam slab. If diseases occur in the beam slab later, due to the full-tube PVC core mold inside, repair and reinforcement cannot be carried out. And high-density foam as the core mold is a disposable material and remains in the cavity of the beam slab after construction. Also, if diseases occur in the beam slab later, due to the foam core mold filled inside, repair and reinforcement cannot be carried out. In addition, the foam core mold also has the problem of easy floating, and due to its large volume, the transportation and storage costs are too high, making it difficult to be widely promoted. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose an inflatable core mold and its working method.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: An inflatable core mold, comprising end molds and a girder pedestal. A core mold and a steel bar framework are provided on the girder pedestal. A PVC half pipe is provided on the upper side of the core mold. The PVC half pipe provides stable top counter support for the core mold, resists buoyancy, and reduces the risk of deformation. The core mold includes an outer airbag and an inner airbag. The outer airbag and the inner airbag are mutually extruded to improve the anti-deformation ability. The outer airbag is divided into multiple independent air chambers, and the multiple independent air chambers are arranged around the inner airbag. Air valves are connected to both the outer airbag and the inner airbag; the steel bar framework includes top plate steel bars and bottom plate steel bars. Stirrups for supporting and positioning the core mold are provided on the bottom plate steel bars. The stirrups are adapted to the core mold. Hooked steel bars are provided on the upper side of the core mold. The hooked steel bars are used to fix the core mold to prevent the core mold from floating during the pouring process. The hooked steel bars are connected to the steel bar framework. Side molds are provided on both sides of the steel bar framework. The end molds, the girder pedestal and the side molds are detachably connected and sealed. A top support structure is provided on the upper side of the side mold. The top support structure limits the core mold to ensure that the thickness of the top and bottom plates of the girder meets the design requirements. The top support structure includes a pressure bar, a rope sleeve and a tensioning structure.

[0006] Preferably, the corresponding radian range of the PVC half pipe is π to 2 / 3π, and the core mold is formed by hot pressing and vulcanizing natural rubber and anti-pull cloth in one step.

[0007] Preferably, an inflation device is provided at the end of the core mold. The inflation device includes a connecting pipe, a quick-release joint and an inflation seat; a control valve seat and an air compressor are provided on one side of the inflation seat. A pressure stabilizing tank is provided on the inflation seat. An air supply pipe is connected between the pressure stabilizing tank and the control valve seat.

[0008] Preferably, the connecting pipe is communicated with the air valve. The connecting pipe is connected to the control valve seat through a quick-release joint. An electromagnetic valve corresponding to the quick-release joint is provided in the control valve seat.

[0009] Preferably, the air supply pipe is communicated with the connecting pipe through an electromagnetic valve. The pressure stabilizing tank is communicated with the air compressor. A pressure sensor is provided on the pressure stabilizing tank.

[0010] Preferably, an installation hole for the core mold to pass through is opened on the end mold, and the installation hole is sealed by an elastic rubber strip and foam glue.

[0011] Preferably, the pressure bar is horizontally arranged on the upper side of the side mold. Limit blocks corresponding to the rope sleeve are provided at both ends of the pressure bar. The tensioning structure includes a hook and a telescopic sleeve; the hook is connected to the side mold through the telescopic sleeve, and the hook is arranged corresponding to the rope sleeve.

[0012] Preferably, the working method of the inflatable core mold includes: Step S1, installing the bottom plate steel bars and tensioning the steel strands; The bottom steel bars of the slab beam are constructed using a shaped jig. After cleaning the slab beam pedestal, apply a release agent and hoist and place the bottom steel bars of the slab beam on the slab beam pedestal. Before laying the steel strands, pre-penetrate the PVC failure pipes and spiral stirrups. The prestressed steel strands of the hollow slab beam are tensioned using intelligent tensioning equipment. After tensioning, the failure pipes and spiral stirrups are positioned according to the requirements of the drawing design. Step S2: Install the core mold and tie the top and bottom steel bars. After the construction of the bottom steel bars and steel strands is completed, install the core mold. The air compressor operates, pressurized air is supplied, the solenoid valve is opened, and the air is sent into the outer airbag and the inner airbag. The core mold is inflated until it meets the load-bearing requirements. Bench bars with the corresponding bottom slab thickness are set below the core mold to provide support. Then, place the PVC half-pipes above the core mold. After the core mold is placed in place and accurately positioned, tie the hook bars above the core mold according to the requirements of the drawing design to prevent the core mold from floating. Step S3: Install the formwork. After grinding and cleaning the end formwork and side formwork, assemble the formwork of the slab beam to reduce manual operation errors. At the end formwork, use a combination of elastic rubber strips and foam rubber to seal to prevent leakage of slurry at the end. Step S4: Pour the concrete. After the formwork of the slab beam is installed, place pressure bars above the top slab to prevent the core mold from floating. At the same time, set fixed steel bars between the two core molds to prevent the core mold from moving left and right. The quality of the concrete is controlled according to a slump of 180 ± 20 mm, and the discharging height is controlled to be no greater than 1 m. The concrete is poured in a staggered manner in steps on the left and right sides to avoid the core mold shifting due to excessive impact of the concrete. During the pouring process, insert steel bars into the concrete to detect the floating situation of the core mold at any time to ensure the thickness of the top and bottom slabs. Step S5: Demold the formwork. Remove the end formwork and side formwork to facilitate subsequent cleaning and reuse. Drain the air in the outer airbag and the inner airbag through the air valve, and the core mold shrinks, making it convenient to take out. Then, remove the PVC half-pipes. After cleaning, it is convenient for recycling.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention adopts a combination of PVC half-pipes and an inflated core mold for support. The PVC half-pipes have a certain rigidity and can provide stable top counter-support for the core mold during concrete pouring, effectively resisting buoyancy and reducing the risk of deformation. The PVC pipes are light in weight, easy to handle and install. The PVC half-pipes can be taken out in the slab beam, reducing construction costs and also facilitating the observation of the quality of the concrete in the cavity. 2. The core mold of the present invention includes an outer airbag and an inner airbag. The outer airbag is further divided into multiple independent air chambers, which are arranged around the inner airbag to improve the load-bearing capacity of the airbag, facilitate positioning and fixing in cooperation with steel bars. At the same time, when local damage occurs, the independent air chambers leak air, which does not affect the temporary continued use of the core mold and effectively guarantees the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 FIG. 6 is a three-dimensional structural schematic diagram of the binding state of the steel bar frame of an inflatable core mold proposed by the present invention; Figure 2 FIG. 9 is a three-dimensional structural schematic diagram of the overall state of the plate girder pouring of an inflatable core mold proposed by the present invention; Figure 3 is Figure 2 the partial enlarged structural schematic diagram at A in FIG. Figure 4 FIG. 17 is a right-side view sectional structural schematic diagram of the overall state of the plate girder pouring of an inflatable core mold proposed by the present invention; Figure 5 FIG. 20 is a right-side view sectional structural schematic diagram of an inflatable core mold proposed by the present invention.

[0015] In the figure: 1, core mold; 11, outer airbag; 12, inner airbag; 13, air valve; 2, PVC half pipe; 3, hook bar; 4, end mold; 5, steel bar frame; 51, stool bar; 6, plate girder pedestal; 7, side mold; 8, inflation device; 81, connecting pipe; 82, quick-release interface; 83, control valve seat; 84, air supply pipe; 85, pressure stabilizing tank; 851, air pressure sensor; 86, inflation seat; 87, air compressor; 9, top support structure; 91, pressure bar; 92, rope sleeve; 93, hook; 94, telescopic sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0017] Refer to Figures 1-5, An inflatable core mold and its working method, including end molds 4 and beam bases 6. There is a core mold 1 and a steel bar rack 5 on the beam base 6. An installation hole for the core mold 1 to pass through is provided on the end mold 4, and the installation hole is sealed by elastic rubber strips and foam glue. There is a PVC half-pipe 2 on the upper side of the core mold 1. The corresponding radian range of the PVC half-pipe 2 is from π to 2 / 3π, that is, a 1 / 2 circular PVC pipe to a 1 / 3 circular PVC pipe. The PVC half-pipe 2 provides stable top counter support for the core mold 1, resists buoyancy, and reduces the risk of deformation. Compared with a steel core mold, the PVC half-pipe 2 is light in weight and easy to handle and install; The 1 / 2 circular PVC pipe is detachable in the beam, but not easily removable. After the concrete is poured, the 1 / 2 circular PVC pipe is likely to get stuck in the beam cavity and is not easy to take out; it may cause some 1 / 2 circular PVC pipes to remain in the beam. If the beam has diseases in the later stage, it is impossible to carry out maintenance and reinforcement; The 1 / 3 circular PVC pipe is easy to take out in the beam, reducing construction costs and facilitating the observation of the quality of the concrete in the cavity. Therefore, a 1 / 3 circular PVC pipe is generally selected; The core mold 1 is formed by hot pressing and vulcanizing natural rubber and anti-pull cloth in one step. The core mold 1 includes an outer airbag 11 and an inner airbag 12. The outer airbag 11 and the inner airbag 12 squeeze each other to improve the anti-deformation ability. The outer airbag 11 is divided into multiple independent air chambers, and the multiple independent air chambers are arranged around the inner airbag 12. If a certain independent air chamber is damaged and leaks air, due to the support of other air chambers, the shape of the core mold 1 can still be maintained and it can continue to be used; Both the outer airbag 11 and the inner airbag 12 are connected with air valves 13. The smaller the diameter of a single airbag, the higher the air pressure that can be borne when multiple airbags form a whole, improving the durability and load-bearing capacity of the core mold 1; An inflation device 8 is provided at the end of the core mold 1. The inflation device 8 includes a connecting pipe 81, a quick-release interface 82 and an inflation seat 86; a control valve seat 83 and an air compressor 87 are provided on one side of the inflation seat 86. A pressure stabilizing tank 85 is provided on the inflation seat 86 to ensure stable inflation pressure and reduce the impact brought by the operation of the air compressor 87. A gas supply pipe 84 is connected between the pressure stabilizing tank 85 and the control valve seat 83. The connecting pipe 81 communicates with the air valve 13, and the connecting pipe 81 is connected to the control valve seat 83 through the quick-release interface 82. An electromagnetic valve corresponding to the quick-release interface 82 is provided in the control valve seat 83 to control the on-off of the air path through the electromagnetic valve. The gas supply pipe 84 communicates with the connecting pipe 81 through the electromagnetic valve, and the pressure stabilizing tank 85 communicates with the air compressor 87. A pressure sensor 851 is provided on the pressure stabilizing tank 85 to feedback the inflation pressure to ensure accurate control of the inflation pressure. When an accident occurs to the core mold 1, the air pressure in the airbag can be quickly detected to provide data support for fault maintenance; The steel bar frame 5 includes fixed steel bars, top plate steel bars and bottom plate steel bars. The bottom plate steel bars are provided with a horse stool bar 51 for supporting and positioning the core mold 1. The horse stool bar 51 is adapted to the core mold 1. A hook bar 3 is provided on the upper side of the core mold 1. The hook bar 3 is used to fix the core mold 1 to prevent the core mold 1 from floating during the pouring process. The hook bar 3 is connected to the steel bar frame 5. A fixed steel bar is provided between the two core molds 1 to prevent the core mold from shifting left and right. Side molds 7 are provided on both sides of the reinforcement frame 5, and the end molds 4, the plate beam pedestal 6 and the side molds 7 are detachably connected and sealed to avoid leakage; A top supporting structure 9 is provided on the upper side of the side form 7. The top supporting structure 9 limits the core form 1 to ensure that the thickness of the top and bottom plates of the slab beam meets the design requirements. The top supporting structure 9 includes a pressure bar 91, a rope sleeve 92 and a tensioning structure. The pressure bar 91 is horizontally erected on the upper side of the side form 7. The pressure bar 91 is pressed against the core form 1 or the hook bar 3 through steel bars or a top rod for limiting and fixing. Limiting blocks corresponding to the rope sleeve 92 are provided at both ends of the pressure bar 91. The tensioning structure includes a hook 93 and a telescopic sleeve 94; the hook 93 is connected to the side form 7 through the telescopic sleeve 94. The telescopic sleeve 94 adopts a threaded structure, or an electric telescopic rod. The hook 93 is set corresponding to the rope sleeve 92, and the rope sleeve 92 is hooked by the hook 93 for convenient quick disassembly.

[0018] The inflatable core mold working method comprises: Step S1, installing bottom plate reinforcement and tensioning steel strands; The slab beam bottom plate reinforcement adopts the shaped tire frame construction, accurately locates the reinforcement, improves the reinforcement installation efficiency, and the bottom plate reinforcement is tied into one piece. After the slab beam pedestal 6 is cleaned, the mold release agent is applied, and the slab beam bottom plate reinforcement is hoisted and placed on the pedestal using the hanger. Concrete pads are placed under the slab beam bottom plate reinforcement, with no less than 4 blocks per square meter; Before laying the steel strands, pre-pierce the PVC failure tube and spiral reinforcement. The steel strands are inserted individually. When inserting, care should be taken to prevent the prestressed reinforcement from shifting. The fixed and tensioning ends of the steel strands are connected to the threaded steel bars with connectors. The prestressed steel strands of the hollow slab beams are tensioned with intelligent tensioning equipment. After tensioning, the failure tube and spiral reinforcement are positioned according to the design requirements of the drawings. Step S2, installing the core mold 1 and tying the top and bottom plate reinforcements; After the construction of the bottom plate reinforcement and steel strands is completed, the core mold 1 is installed, the air compressor 87 is operated, pressurized air is added, the solenoid valve is opened, and air is sent into the outer air bag 11 and the inner air bag 12, and the core mold 1 is inflated until the load-bearing requirements are met; When the core mold 1 is inflated, each independent air cavity needs to be inflated alternately to a uniform pressure to prevent local stress concentration. After inflation, it is necessary to maintain the pressure for a period of time, and the pressure changes in the outer airbag 11 and the inner airbag 12 are monitored by the air pressure sensor 851. If a large pressure change occurs, the construction personnel will promptly check and repair it; Mandrels 1 with different diameters correspond to specific air pressure ranges. For example, a mandrel with a diameter of 80 mm requires 0.12 MPa, a mandrel with a diameter of 250 mm requires 0.05 MPa, and a mandrel with a diameter of 2200 mm only requires 0.005 MPa. The air pressure is closely related to the load-bearing capacity of the mandrel 1. Excessive air pressure may cause rupture, while too low air pressure cannot maintain the shape. Insufficient air pressure: The mandrel does not expand sufficiently and cannot resist the lateral pressure of the concrete, resulting in deformation or leakage of mortar. Excessive air pressure: The rubber material is overstretched, deformed, its service life is shortened, and it may even rupture. Bench bars 51 with corresponding bottom plate thicknesses are arranged below the mandrel 1 to provide support, and then the PVC half pipes 2 are placed above the mandrel 1. After the mandrel 1 is placed in place and accurately positioned, according to the requirements of the drawing design, hook bars 3 are tied above the mandrel 1 to prevent the mandrel from floating. After the installation of the mandrel 1 is completed, the steel bars in the remaining parts are tied. The stirrups, horizontal bars, and main bars are tied and fixed with binding wires, and the intersections of the steel bars are tied firmly with double binding wires. Step S3: Formwork installation. After the end form 4 and the side form 7 are polished and cleaned, the formwork of the slab beam is assembled to reduce manual operation errors. The end form 4 is sealed by combining an elastic rubber strip and foam glue to prevent mortar leakage at the end. Step S4: Concrete pouring. After the formwork installation of the slab beam is completed, pressure bars 91 are placed above the top plate to prevent the mandrel 1 from floating. At the same time, fixed steel bars are arranged between the two mandrels 1 to prevent the mandrel 1 from moving left and right. The quality of the concrete is controlled according to a slump of 180 ± 20 mm, and the discharging height is controlled to be no more than 1 m. The concrete is poured in a way that the left and right sides are staggered forward in a ladder shape, using the method of layered pouring + pouring from one end to the other end. The thickness of each layer should not exceed 30 cm to avoid the mandrel 1 shifting due to excessive impact of the concrete. During the tying of the steel bar frame 5 and the concrete pouring, the state of the mandrel 1 is checked in a timely manner to avoid deformation or floating, which may affect the pouring quality of the slab beam. During the pouring process, steel bars are inserted into the concrete to detect the floating situation of the mandrel 1 at any time to ensure the thickness of the top and bottom plates. Step S5: Formwork removal. The end form 4 and the side form 7 are removed to facilitate subsequent cleaning and reuse. The air in the outer airbag 11 and the inner airbag 12 is discharged through the air valve 13, and the mandrel 1 shrinks, making it convenient to take out. After that, the PVC half pipes 2 are removed and, after cleaning, are convenient for recycling.

[0019] As described above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered within the protection scope of the present invention.

[0020] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or their combinations.

[0021] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. An inflatable core mold, comprising an end mold (4) and a plate beam pedestal (6), characterized in that: The plate beam pedestal (6) is provided with a core mold (1) and a steel frame (5); a PVC half pipe (2) is provided on the upper side of the core mold (1); the PVC half pipe (2) provides a stable top counter-support for the core mold (1), resists buoyancy, and reduces the risk of deformation; the core mold (1) comprises an outer air bag (11) and an inner air bag (12); the outer air bag (11) is divided into a plurality of independent air cavities; the plurality of independent air cavities are arranged around the inner air bag (12); the outer air bag (11) and the inner air bag (12) are both connected to an air valve (13); The steel bar frame (5) comprises top plate steel bars and bottom plate steel bars. The bottom plate steel bars are provided with horse stool bars (51) for supporting and positioning the core mold (1). The horse stool bars (51) are adapted to the core mold (1). A hook bar (3) is provided on the upper side of the core mold (1). The hook bar (3) is used to fix the core mold (1) to prevent the core mold (1) from floating up during the pouring process. The hook bar (3) is connected to the steel bar frame (5). Side molds (7) are provided on both sides of the steel bar frame (5). The end mold (4), the plate beam pedestal (6) and the side molds (7) are detachably connected and sealed. A top support structure (9) is provided on the upper side of the side mold (7). The top support structure (9) limits the core mold (1) to ensure that the thickness of the top and bottom plates of the plate beam meets the design requirements. The top support structure (9) comprises a pressure bar (91), a rope sleeve (92) and a tensioning structure.

2. An inflatable core mold according to claim 1, characterized in that: The PVC half-tube (2) corresponds to an arc range of π to 2 / 3π, and the core mold (1) is formed in one step by hot pressing and vulcanization of natural rubber and anti-pull cloth.

3. An inflatable core mold according to claim 1, characterized in that: An inflation device (8) is provided at the end of the core mold (1), and the inflation device (8) comprises a connecting pipe (81), a quick-release interface (82) and an inflation seat (86); A control valve seat (83) and an air compressor (87) are provided on one side of the inflation seat (86); a pressure stabilizing tank (85) is provided on the inflation seat (86); and an air supply pipe (84) is connected between the pressure stabilizing tank (85) and the control valve seat (83).

4. An inflatable core mold according to claim 3, characterized in that: The connecting pipe (81) is in communication with the air valve (13); the connecting pipe (81) is connected to the control valve seat (83) via a quick-release interface (82); a solenoid valve corresponding to the quick-release interface (82) is provided in the control valve seat (83).

5. An inflatable core mold according to claim 4, characterized in that: The air supply pipe (84) is in communication with the connecting pipe (81) via a solenoid valve, the pressure stabilizing tank (85) is in communication with the air compressor (87), and an air pressure sensor (851) is provided on the pressure stabilizing tank (85).

6. An inflatable core mold according to claim 1, characterized in that: The end mold (4) is provided with a mounting hole for accommodating the core mold (1) to pass through, and the mounting hole is sealed by an elastic rubber strip and foam glue.

7. An inflatable core mold according to claim 1, characterized in that: The pressure bar (91) is transversely mounted on the upper side of the side mold (7), and limit blocks corresponding to the rope sleeve (92) are provided at both ends of the pressure bar (91), and the tensioning structure includes a hook (93) and a telescopic sleeve (94); The hook (93) is connected to the side mold (7) via a telescopic sleeve (94), and the hook (93) and the rope sleeve (92) are arranged correspondingly.

8. A method for operating an inflatable mandrel according to any one of claims 1 to 7, characterized in that: include: Step S1, installing bottom plate reinforcement and tensioning steel strands; The slab beam bottom plate reinforcement is constructed using a shaped frame, the slab beam pedestal (6) is cleaned, a release agent is applied, and the slab beam bottom plate reinforcement is hoisted and placed on the slab beam pedestal (6); Before laying the steel strands, pre-pierce the PVC failure tube and spiral reinforcement. The prestressed steel strands of the hollow slab beam are tensioned using intelligent tensioning equipment. After tensioning, the failure tube and spiral reinforcement are positioned according to the design requirements of the drawings. Step S2, installing the core mold (1) and tying the top and bottom plate reinforcements; After the construction of the bottom plate reinforcement and steel strands is completed, the core mold (1) is installed, the air compressor (87) is operated, pressurized air is added, the solenoid valve is opened, and air is sent into the outer air bag (11) and the inner air bag (12), and the core mold (1) is inflated until the load-bearing requirements are met; A saddle bar (51) having a thickness corresponding to that of the bottom plate is arranged below the core mold (1) to provide support, and then the PVC half pipe (2) is placed above the core mold (1); after the core mold (1) is placed in place and accurately positioned, a hook bar (3) is tied above the core mold (1) in accordance with the design requirements of the drawing to prevent the core mold from floating up; Step S3, template installation; After the end mold (4) and the side mold (7) are polished and cleaned, the plate beam is assembled by mold closing to reduce manual operation errors; the end mold (4) is sealed by using elastic rubber strips combined with foam glue to prevent leakage of slurry at the end; Step S4, concrete pouring; After the plate beam formwork is installed, a pressure bar (91) is placed above the top plate to prevent the core mold (1) from floating up, and a fixed steel bar is arranged between the two core molds (1) to prevent the core mold (1) from moving left and right; The quality of the concrete is controlled according to the slump of 180±20mm, and the discharge height is controlled to be no more than 1m; the concrete is poured forward in a staggered manner according to the steps on the left and right sides to avoid the core mold (1) being offset due to excessive impact of the concrete; during the pouring process, steel bars are inserted into the concrete to check the floating condition of the core mold (1) at any time to ensure the thickness of the top and bottom plates; Step S5, template removal; The end mold (4) and the side mold (7) are removed to facilitate subsequent cleaning and reuse. The air in the outer air bag (11) and the inner air bag (12) is discharged through the air valve (13), and the core mold (1) is contracted to facilitate removal. Thereafter, the PVC half pipe (2) is removed and cleaned for easy recycling.

9. The inflatable core mold working method according to claim 8, characterized in that: In step S2, when the core mold (1) is inflated, each independent air cavity needs to be alternately inflated to a uniform pressure to prevent local stress concentration. After inflation, it is necessary to maintain the pressure for a period of time, and the pressure changes in the outer air bag (11) and the inner air bag (12) are monitored by the air pressure sensor (851). If a large pressure change occurs, the construction personnel will promptly check and repair it; During the process of tying the reinforcement frame (5) and pouring concrete, the state of the core mold (1) is checked in time to avoid deformation or floating, which may affect the pouring quality of the slab beam.

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