Small-section hollow slab beam core mold for bridge and construction method of small-section hollow slab beam core mold

Abstract

The invention provides a bridge small-section hollow slab beam core mold and a construction method thereof, and belongs to the technical field of bridge construction. The core mold comprises a shaping main body, a supporting frame, a pull-down piece and an isolation pad, the shaping body comprises a plurality of hollow pipes, and the adjacent hollow pipes are attached to each other to form a continuous outer surface and a continuous inner surface. The inner surface of each hollow pipe is attached to and connected to the corresponding supporting frame in a breakable mode, and the supporting frames are evenly arranged in the length direction of the shaping unit. The pull-down piece is arranged in the supporting frame and is provided with an inhaul cable; and the isolation pad covers the outer surface of the shaping main body. The multiple hollow pipes are spliced to form the shaping body, the supporting frame is adopted for supporting the shaping body, the core mold is split into the multiple light-weight components, and the dismounting difficulty of the core mold is reduced; good stability and strength are achieved; by designing the corner core pipes, the connecting core pipes and the standard core pipes, flexible permutation and combination can be carried out, the construction requirements of different abdominal cavity section forms and sizes are met, and the manufacturing and using cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a core mold of a small-section hollow slab beam of a bridge and a construction method thereof. Background Art

[0002] Prefabricated hollow slab beams have many advantages such as lightness, firmness, economy and stability. As the main span structure of small and medium-sized bridges, they are widely used in highways, railways and urban roads. In the prior art, steel plates, PVC plates or high-density foams are usually used as core molds for the construction of hollow slab beams. However, due to the small size of the hollow slab beams of small and medium-sized bridges, the cross-sectional size of the hollow belly cavity inside is generally 40cm-70cm. When the core mold of the slab beam is removed after the pouring of the slab beam concrete, the operator cannot enter the belly cavity of the hollow slab beam for removal, which makes it difficult to remove the core mold, which is not only time-consuming and labor-intensive, but also easy to damage the surface of the molded concrete. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a core mold of a small-section hollow slab beam of a bridge and a construction method thereof, which solves the problem that the core mold of the small-section hollow slab beam is difficult to dismantle after construction, realizes the turnover use of the core mold, and reduces the production and use costs.

[0004] The technical solution adopted by the present invention is: a core mold of a small-section hollow slab beam of a bridge, including a shaping body, a support frame pull-down piece and an isolation pad; the shaping body includes a plurality of hollow tubes, and adjacent hollow tubes are fitted together to form a continuous outer surface and inner surface; the inner surface of each hollow tube is fitted and breakably connected to the support frame, and the support frame is evenly arranged along the length direction of the shaping unit; the pull-down piece is arranged inside the support frame and is provided with a cable; the isolation pad is coated on the outer surface of the shaping body.

[0005] Furthermore, the hollow tube includes a corner core tube, a connecting core tube and a standard core tube, and the connecting core tube is arranged between the standard core tube and the corner core tube.

[0006] Furthermore, the standard core tube, the connecting core tube and the corner core tube are symmetrically arranged with respect to the length direction of the cross section of the shaped body.

[0007] Furthermore, the support frame includes a plurality of support members connected end to end, the support member includes a fitting surface and a vertical surface, the fitting surface is fitted to the hollow tube and spot-welded, and the pull-down member is connected to the vertical surface.

[0008] Furthermore, a chamfered surface is provided at a corner of the support frame, and an inflatable cushion is provided between the chamfered surface and the shaping body.

[0009] Furthermore, the hollow tubes are spliced ​​and connected to form a top shaping unit, a bottom shaping unit and a lateral shaping unit, and the lateral shaping unit is arranged between the top shaping unit and the bottom shaping unit.

[0010] Furthermore, the support frame includes a bottom support frame, a top support frame and a lateral support frame, which are respectively arranged corresponding to the top shaping unit, the bottom shaping unit and the lateral shaping unit.

[0011] Furthermore, the lateral support is connected to the bottom support and the top support via an oblique wedge seam.

[0012] Furthermore, two ends of the pull-down member are respectively connected to the middle of the bottom support and the top support.

[0013] The construction method of the core mold of the small-section hollow slab beam of the bridge as described above comprises the following steps:

[0014] Design hollow tubes and support frames according to the cross-sectional shape of hollow slab beams and finalize their production;

[0015] Install the pull-down member on the support frame;

[0016] Assemble the bottom shaping unit;

[0017] Pasting an inflatable cushion at a set position of the bottom shaping unit;

[0018] Install the support frame, and connect the support frame to the hollow tube constituting the bottom shaping unit by spot welding;

[0019] Pasting the inflatable cushion at a set position of the support frame;

[0020] Installing the lateral shaping unit from bottom to top, and connecting the lateral shaping unit and the supporting frame by spot welding;

[0021] Install a top shaping unit, and connect the top shaping unit and the support frame by spot welding;

[0022] The gaps are filled with polyurethane foam and the outer surface of the shaped body is covered with an isolation pad;

[0023] After the construction is completed, the support frame and the pull-down member are taken out by pulling the cable;

[0024] The top shaping unit, the side shaping unit and the bottom shaping unit are removed in sequence from top to bottom in a bilaterally symmetrical manner.

[0025] The advantages and positive effects of the present invention are as follows: the present application assembles a plurality of hollow tubes to form a shaped main body, adopts a support frame to support the shaped main body, and splits the core mold into a plurality of lightweight components. Construction personnel do not have to enter the abdominal cavity, and can conveniently remove the core mold from the inside to the outside in sequence, thereby reducing the difficulty of removing the core mold and improving construction efficiency; in addition, the design also reduces the overall weight of the core mold, reduces the difficulty of moving and installing the core mold, and realizes the turnover use of the core mold.

[0026] By spot welding each hollow tube to the support frame, the core molds are connected to form a closed overall structure with good stability and strength; by designing the corner core tubes, connecting core tubes and standard core tubes, the standard core tubes are standardized according to the set modules, and the corner core tubes and connecting core tubes are shaped and manufactured according to needs, and can be flexibly arranged and combined to meet the construction needs of different abdominal cross-section forms and sizes, thereby reducing the production and use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a small-section hollow slab girder structure of a bridge according to a specific implementation of the present invention;

[0028] Figure 2 It is a schematic diagram of the core mold structure of a specific implementation of the present invention;

[0029] Figure 3 It is a schematic diagram of a standard core tube structure of a specific implementation of the present invention;

[0030] Figure 4 It is a schematic diagram of the corner core tube structure of a specific implementation of the present invention;

[0031] Figure 5 It is a schematic diagram of the connecting core tube structure of a specific implementation of the present invention;

[0032] Figure 6 It is a schematic diagram of a supporting member structure according to a specific implementation of the present invention;

[0033] Figure 7 It is a schematic diagram of the pull-down member structure of a specific implementation of the present invention.

[0034] In the figure:

[0035] 1. Hollow slab beam; 2. Belly; 3. Standard core tube; 4. Corner core tube; 5. Connecting core tube; 6. Support frame; 61. Support member; 7. Pull-down device; 71. Cable; 8. Inflatable cushion; 9. Isolation cushion. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0037] The present invention provides a core mold for a small-section hollow slab beam of a bridge, which is used to shape the concrete when the hollow slab beam is poured, so as to form a belly cavity with a designed cross-sectional shape; usually, the cross-sectional shape of the belly cavity is designed to be rectangular, circular, elliptical, trapezoidal or other special-shaped cross-sectional forms. Figure 1 A hollow slab beam 1 with an octagonal cross-section of the belly 2 is shown in the figure; in the prior art, a fixed rigid formwork is usually made according to the cross-sectional form of the belly 2 of the hollow slab beam 1 for construction. The fixed rigid formwork is usually a steel plate, a PVC plate or a high-density foam. However, due to the small cross-sectional size of the belly 2 of the small-section hollow slab beam of the bridge, construction workers cannot enter the belly 2 for demolition after the concrete is formed.

[0038] In order to solve the above technical problems, the present application proposes a bridge small cross-section hollow slab beam core mold, such as Figure 1 As shown, it includes a shaping body, a support frame 6, a pull-down piece 7 and an isolation pad 9: wherein the shaping body includes a plurality of hollow tubes, and two adjacent hollow tubes are fitted together to form a continuous outer surface and inner surface, so as to form an abdominal cavity 2 with a designed cross-sectional form; the inner surface of each hollow tube is fitted and breakably connected to the support frame 6, and the support frame 6 is evenly arranged along the length direction of the shaping unit, so as to form an effective support for the shaping body; the pull-down piece 7 is arranged inside the support frame 6, and a cable 71 is provided. After the construction is completed, the cable 71 is pulled to break the connection between the support frame 6 and the shaping body, so as to facilitate the removal of the support frame 6 inside the abdominal cavity 2, and then remove the hollow tubes one by one; the isolation pad 9 is coated on the outer surface of the shaping body, so as to form a waterproof isolation layer, so as to prevent the slurry seepage from being isolated on the outside of the shaping body during concrete pouring, so as to avoid adverse effects on the removal of the shaping body.

[0039] The hollow tubes of the above-mentioned shaped body fit each other but are not fixedly connected to each other; the shape of the outer surface formed by the hollow tubes is constructed to match the shape of the belly cavity 2 of the hollow slab beam 1, and is used to form a belly cavity 2 with a set cross-sectional shape; the above-mentioned multiple hollow tubes form a hollow structure, and a support frame 6 is provided inside the hollow structure, and the support frame 6 is arranged inside the shaped body at a set interval along the length direction to form an effective support for the shaped body; through the above-mentioned technical scheme, the overall core mold forms a closed structure, which not only ensures its stability and strength, so that it can better resist the buoyancy, impact force and vibration force of the vibrating equipment transmitted to the core mold during concrete pouring, and by splitting the core mold into multiple lightweight components, construction personnel do not have to enter the belly cavity 2, and can easily remove the core mold from the inside to the outside in sequence, which reduces the difficulty of removing the core mold and improves construction efficiency; in addition, the design also reduces the overall weight of the core mold and reduces the difficulty of moving and installing the core mold.

[0040] The above-mentioned hollow tube is a steel tube with a hollow structure, and its cross-sectional shape and size are designed according to the cross-sectional area of ​​the belly cavity 2 of the hollow slab beam 1; preferably, when used for a hollow slab beam 1 whose belly cavity 2 cross-sectional area is rectangular or trapezoidal, the hollow tube in the present application includes a corner core tube 4, a connecting core tube 5 and a standard core tube 3, and the connecting core tube 5 is arranged between the standard core tube 3 and the corner core tube 4; specifically, the corner core tube 4 is constructed to match the corner shape of the rectangular or trapezoidal cross-section, the standard core tube 3 is a steel tube with a square or rectangular cross-section of a fixed size, and several standard core tubes 3 and corner core tubes 4 are spliced ​​according to certain rules to form a belly cavity 2 with a notch, and the connecting core tube 5 is made according to the shape of the notch, and preferably the connecting core tube 5 is located between the standard core tube 3 and the corner core tube 4, and the three are surrounded to form a shaped body with a continuous outer surface and inner surface. Through this technical solution, the standard core tube 3 is standardized according to the set module, the corner core tube 4 and the connecting core tube 5 are shaped and manufactured according to the needs, and the abdominal cavity 2 with different cross-sectional forms and sizes can be formed by flexibly arranging and combining different corner core tubes 4, connecting core tubes 5 and standard core tubes 3 to meet the construction requirements of different hollow slab beams 1, thereby simplifying the production process of the standard core tube 3, realizing the turnover use of the standard core tube 3, and reducing the production and use costs.

[0041] In a specific embodiment, Figure 2 , Figure 3 and Figure 4 The structure of the hollow tube for the hollow slab beam 1 with the cross section of the belly cavity 2 in the form of a chamfered rectangle is shown. The cross section of the belly cavity 2 of the hollow slab beam 1 gradually decreases from one end to the other end. The cross section of the standard core tube 3 is designed to be a rectangle. The cross section of the corner core tube 4 is a right triangle, which is made according to the shape of the chamfered part of the belly cavity 2. The cross section of the connecting core tube 5 is a rectangle and the cross section size gradually decreases from one end to the other end. By combining and splicing the corner core tube 4, the connecting core tube 5 and the standard core tube 3 in a designed manner, a shaped main body compatible with the cross section of the belly cavity 2 of the hollow slab beam 1 can be formed.

[0042] Furthermore, the standard core tube 3, the connecting core tube 5 and the corner core tube 4 in the present application are symmetrically arranged with respect to the length direction of the cross section of the shaped body. This technical solution enables the load during concrete pouring to be evenly distributed in the length direction of the cross section of the shaped body, thereby avoiding the problem of local stress concentration, helping to improve the bearing capacity and overall stability of the shaped body, and improving the overall strength of the shaped body.

[0043] Furthermore, the above-mentioned support frame 6 includes a plurality of support members 61 connected end to end, and the support member 61 includes a fitting surface and a vertical surface. The fitting surface is fitted with the hollow tube and is breakably connected. The function of the connection is to temporarily fix the hollow tube to the support frame 6. Connection forms such as spot welding connection, adhesive connection or wire binding connection can be adopted. Preferably, spot welding connection is adopted. The vertical surface is vertically connected to the fitting surface and is located on the relatively inner side of the support frame 6, and the pull-down member 7 is connected to the vertical surface; the function of the spot welding connection is to form a temporary fixing method, so that the support frame 6 and the shaping body can be connected as a whole, which is convenient for positioning the shaping body and preventing the shaping body and the support frame 6 from relative displacement during the movement of the integral core mold and the pouring of concrete, thereby affecting the molding effect and quality of the hollow slab beam 1; at the same time, it is also convenient to release the connection between the two by applying a small external force after the construction is completed, so as to facilitate the removal of each component one by one.

[0044] Furthermore, a chamfered surface is provided at the corner of the support frame 6, and an inflatable cushion 8 is provided between the chamfered surface and the shaping body. The inflatable cushion 8 is tightly connected to the chamfered surface and the shaping body respectively. Since the inflatable cushion 8 has a certain elasticity and compressibility, it can adapt to the slight deformation of the support frame 6 and the shaping body that may occur during use, thereby avoiding the existence of a gap between the support frame 6 and the shaping body; at the same time, it is more convenient for workers to perform assembly operations, and the sharp angle design of the corner of the support frame 6 reduces the possible wear and tear, thereby improving the integrity of the support frame 6 and the shaping body.

[0045] In a specific embodiment, Figure 2 As shown, the hollow tubes are spliced ​​and connected to form a top shaping unit, a bottom shaping unit and a lateral shaping unit, and the lateral shaping unit is arranged between the top shaping unit and the bottom shaping unit. In this embodiment, the top shaping unit and the bottom shaping unit both include three standard core tubes 3 arranged in the middle of the length direction of the shaping body cross section and a connecting core tube 5 and a corner core tube 4 arranged on both sides of the three standard core tubes 3; the two lateral shaping units both include two connecting core tubes 5 and two standard core tubes 3, and the cross section formed by the outer surfaces of the top shaping unit, the bottom shaping unit and the lateral shaping unit is an octagon, and the cross section formed by the inner surfaces is a rectangle. The octagon and the rectangle are symmetrical about the center line along the width direction of the shaping body cross section.

[0046] Furthermore, the support frame 6 includes a bottom support, a top support and a side support, which are respectively arranged corresponding to the top shaping unit, the bottom shaping unit and the side shaping unit; specifically, the bottom support is adhered to and spot-welded to the inner surface of the bottom shaping unit, the top support is adhered to and spot-welded to the inner surface of the top support; the side support is adhered to and spot-welded to the inner surface of the side shaping unit, so that the support frame 6 provides more effective and balanced support for the shaping body.

[0047] The lateral support is connected to the bottom support and the top support by an oblique wedge seam. In a specific embodiment, the lateral support, the bottom support and the top support are all welded by angle steels, and a 45-degree oblique wedge is set between two adjacent angle steels. The connection surface between the inflatable cushion 8 and the chamfered surface of the support frame 6 is slightly smaller than the chamfered surface. This design makes it easy for the operator to install the inflatable cushion 8 to the correct position of the chamfered surface of the support frame 6 by referring to the position of the oblique wedge seam, so that the center line of the inflatable cushion 8 coincides with the oblique center line of the support frame 6.

[0048] The two ends of the pull-down member 7 are respectively connected to the middle of the bottom support and the top support. Specifically, the pull-down member 7 is made of a rod-shaped or strip-shaped steel material, and its two ends are respectively welded to the bottom support and the top support. The cable 71 can be a steel wire rope or a steel strand, fixed in the middle of the pull-down member 7. The cable 71 has a sufficient length. When the support frame 6 and the shaping body are installed, the other end of the cable 71 is pulled to the outside of the shaping body, so that the support frame 6 is separated from the shaping body and removed one by one by applying an external force to the support frame 6 through the cable 71 after the construction is completed.

[0049] The present application proposes a construction method for a core mold of a small-section hollow slab beam of a bridge, comprising the following steps:

[0050] S1. Designing the hollow tube and the support frame 6 according to the cross-sectional shape of the hollow slab beam 1 and finalizing the production;

[0051] Specifically, the shapes, specifications and quantities of the standard core tube 3, corner core tube 4, connecting core tube 5, support frame 6 and pull-down piece 7 are determined according to the cross-sectional shape of the hollow slab beam 1, and the standard core tube 3, corner core tube 4, connecting core tube 5, support frame 6 and pull-down piece 7 are manufactured in a factory or a prefabrication site. The horns and weld scars are polished to be smooth and level, and then stored in a classified manner.

[0052] S2, installing the pull-down member 7 on the support frame 6;

[0053] S3, assembling the bottom shaping unit;

[0054] Select a flat surface as the assembly platform, draw the center line of the core mold on the assembly platform, first place the standard core tube 3 from the center line to both sides, and then place the connecting core tube 5 and the corner core tube 4 in sequence, so that the two adjacent hollow tubes fit together to form a top shaping unit.

[0055] S4, pasting the inflatable pad 8 at the set position of the bottom shaping unit;

[0056] The inflatable cushion 8 is in the shape of a strip with a certain length, and is pasted on the bottom shaping unit according to the intended installation position of the support frame 6 .

[0057] S5, installing the support frame 6, and spot welding the support frame 6 to the hollow tube constituting the bottom shaping unit;

[0058] When installing the support frame 6, the oblique wedge seam at the bottom of the support frame 6 should be aligned with the center line of the inflatable cushion 8 so that the support frame 6 presses the inflatable cushion 8, and then the support frame 6 is spot welded to the hollow tube at the bottom thereof.

[0059] S6, pasting the inflatable cushion 8 at the set position of the support frame 6;

[0060] The inflatable cushion 8 is pasted on the chamfered corner of the upper part of the support frame 6, and the center line of the inflatable cushion 8 is aligned with the corresponding oblique wedge seam during installation.

[0061] S7, installing the lateral shaping unit from bottom to top, and connecting the lateral shaping unit and the support frame 6 by spot welding;

[0062] First, place the connecting core tube 5 constituting the lateral shaping unit at the designed position above the corner core tube 4 of the bottom shaping unit, and spot weld the connecting core tube 5 to the support frame 6; then install the standard core tube 3 and the connecting core tube 5 above the standard core tube 3, and after each hollow tube is installed in place, it is spot welded to the support frame 6, and then install the other hollow tube on the upper part; during installation, ensure that the lateral shaping units on the left and right sides are symmetrical.

[0063] S8, installing the top shaping unit, and spot welding the top shaping unit and the support frame 6;

[0064] First, place the standard core tube 3 constituting the top shaping unit from the center line to the upper part of the support frame 6 on both sides, and spot weld them to the support frame 6 respectively; install the connecting core tube 5 and the corner core tube 4 in sequence from the center to the left and right sides, and after each hollow tube is installed in place, it is spot welded to the support frame 6, and then install another hollow tube on its side; until each hollow tube of the top shaping unit is spot welded to the support frame 6.

[0065] S9, using polyurethane foaming agent to fill the gap, and covering the outer surface of the shaped body with an isolation pad 9;

[0066] After the core mold is assembled, the core mold is moved to the stand with a lifting device to be in a suspended state. The gap between each member of the core mold is filled with polyurethane foaming agent, and then the raised foaming agent is cut off with a blade, and then the core mold overall outer surface is coated with an isolation pad 9.

[0067] S10, after the construction is completed, the support frame 6 and the pull-down member 7 are taken out by pulling the cable 71;

[0068] Concreting ends, and when concrete strength reaches the core mold removal strength, begins to remove the core mold. At first, the afterbody of the fall chain and the dragline 71 is firmly tied, and the fall chain is manually pulled to pull down the support frame 6 of the shaping main body inside one by one and take out.

[0069] S11. Remove the top forming unit, the side forming unit and the bottom forming unit in a symmetrical manner from top to bottom.

[0070] After all the support frames 6 are taken out, use tools such as crowbars, sledgehammers or hammers to pry the standard core tubes 3 one by one, starting from the standard core tube 3 of the top forming unit located at the center line of the core mold, remove it from the concrete and take it out from the abdominal cavity 2 of the hollow slab beam 1, and then use the same method to take out the connecting core tube 5 and the corner core tube 4 of the top forming unit, the connecting core tube 5 and the standard core tube 3 of the lateral forming unit, and finally take out the standard core tube 3, connecting core tube 5 and corner core tube 4 of the bottom forming unit from the center to both sides in turn. At this point, the removal of all the core molds is completed, and the standard core tube 3, corner core tube 4, connecting core tube 5, support frame 6 and pull-down piece 7 can be turned over to the next hollow slab beam 1 core mold construction.

[0071] The present application assembles a plurality of hollow tubes to form a shaped main body, uses a support frame to support the shaped main body, and splits the core mold into a plurality of lightweight components. Construction workers do not have to enter the abdominal cavity and can conveniently remove the core mold from the inside to the outside in sequence, thereby reducing the difficulty of removing the core mold and improving construction efficiency. In addition, the design also reduces the overall weight of the core mold, reduces the difficulty of moving and installing the core mold, and realizes the turnover use of the core mold.

[0072] By spot welding each hollow tube to the support frame, the core molds are connected to form a closed overall structure with good stability and strength; by designing the corner core tubes, connecting core tubes and standard core tubes, the standard core tubes are standardized according to the set modules, and the corner core tubes and connecting core tubes are shaped and manufactured according to needs, and can be flexibly arranged and combined to meet the construction needs of different abdominal cross-section forms and sizes, thereby reducing the production and use costs.

[0073] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A core mold for a small-section hollow slab beam of a bridge, characterized in that: It includes a shaping body, a support frame, a pull-down piece and an isolation pad; the shaping body includes a plurality of hollow tubes, and adjacent hollow tubes are fitted together to form a continuous outer surface and inner surface; the inner surface of each hollow tube is fitted and breakably connected to the support frame, and the support frame is evenly arranged along the length direction of the shaping unit; the pull-down piece is arranged inside the support frame and is provided with a pull rope; the isolation pad is coated on the outer surface of the shaping body.

2. The core mold for the small-section hollow slab beam of a bridge according to claim 1, characterized in that: The hollow tube comprises a corner core tube, a connecting core tube and a standard core tube, wherein the connecting core tube is arranged between the standard core tube and the corner core tube.

3. The core mold of the small-section hollow slab beam of a bridge according to claim 2 is characterized in that: The standard core tube, the connecting core tube and the corner core tube are symmetrically arranged with respect to the length direction of the cross section of the shaped body.

4. The core mold for a small-section hollow slab beam of a bridge according to any one of claims 1 to 3, characterized in that: The support frame includes a plurality of support members connected end to end, the support member includes a fitting surface and a vertical surface, the fitting surface is fitted to the hollow tube and spot-welded, and the pull-down member is connected to the vertical surface.

5. The core mold for the small-section hollow slab beam of a bridge according to claim 4, characterized in that: A chamfered surface is provided at the corner of the support frame, and an inflatable cushion is provided between the chamfered surface and the shaping body.

6. The core mold for the small-section hollow slab beam of a bridge according to claim 1, 2, 3 or 5, characterized in that: The hollow tubes are spliced ​​and connected to form a top shaping unit, a bottom shaping unit and a lateral shaping unit, and the lateral shaping unit is arranged between the top shaping unit and the bottom shaping unit.

7. The core mold for the small-section hollow slab beam of a bridge according to claim 6, characterized in that: The support frame comprises a bottom support frame, a top support frame and a lateral support frame, which are respectively arranged corresponding to the top shaping unit, the bottom shaping unit and the lateral shaping unit.

8. The core mold for the small-section hollow slab beam of a bridge according to claim 7, characterized in that: The lateral support is connected to the bottom support and the top support via an oblique wedge seam.

9. The core mold for the small-section hollow slab beam of a bridge according to claim 8, characterized in that: The two ends of the pull-down member are respectively connected to the middle of the bottom support and the top support.

10. The construction method of the core mold of the small-section hollow slab beam of a bridge according to any one of claims 1 to 9, characterized in that: The following steps are involved: Design hollow tubes and support frames according to the cross-sectional shape of hollow slab beams and finalize their production; Install the pull-down member on the support frame; Assemble the bottom shaping unit; Pasting an inflatable cushion at a set position of the bottom shaping unit; Install the support frame, and connect the support frame to the hollow tube constituting the bottom shaping unit by spot welding; Pasting the inflatable cushion at a set position of the support frame; Installing the lateral shaping unit from bottom to top, and connecting the lateral shaping unit and the supporting frame by spot welding; Install a top shaping unit, and connect the top shaping unit and the support frame by spot welding; The gaps are filled with polyurethane foam and the outer surface of the shaped body is covered with an isolation pad; After the construction is completed, the support frame and the pull-down member are taken out by pulling the cable; The top shaping unit, the side shaping unit and the bottom shaping unit are removed in sequence from top to bottom in a bilaterally symmetrical manner.

Images