Square silo wall structure free of formwork removal

Abstract

The invention relates to a square silo wall structure free of formwork removal. An inner formwork and an outer formwork are symmetrically arranged, a pouring cavity for pouring concrete is defined between the inner formwork and the outer formwork, a plurality of hook connecting columns are arranged on the inner surfaces of plate bodies of the inner formwork and the outer formwork, the cross sections of the hook connecting columns are trapezoidal, the cross sections of the hook connecting columns are gradually increased from the plate bodies to the outside, the hook connecting columns vertically extend, and C-shaped clamping grooves are formed in the outer end faces of the hook connecting columns. The C-shaped clamping groove vertically extends, elastic metal clamping strips are symmetrically connected to the groove edges of the two sides of the C-shaped clamping groove, the cross section of each elastic metal clamping strip is of an arc-shaped structure defined by a first section, a protruding part and a second section, the protruding part extends towards the groove opening direction of the C-shaped clamping groove, and a necking structure is defined by the two symmetrical first sections. A horn-shaped guide structure is defined by the two second sections, a vertical rib of the reinforcement cage can slide into the position between the necking structure and the C-shaped clamping groove through guiding of the guide structure, and after the post-poured concrete is solidified, the elastic metal clamping strip cannot deform so that the vertical rib can be locked.

Description

Technical Field

[0001] The invention relates to a square silo wall structure free of mould removal. Background Art

[0002] Silos are grain storage silos, typically constructed of reinforced concrete. To ensure the walls can withstand sufficient tensile stress and prevent cracks, they typically feature thickened walls or double-walled structures with a central interlayer. Thickened walls can reach 800-1000mm thick, requiring more material and being heavier. Hollow double-walled structures, on the other hand, require simultaneous internal and external formwork installation, a complex process (increasing time by 40%) and challenging joint management (e.g., dense reinforcement at the haunch).

[0003] Several existing technologies offer formwork-free solutions, such as prefabricated concrete formwork using 3D printing technology. These prefabricated concrete formwork, with pre-embedded steel mesh and connectors, serves as the silo's permanent structural layer. High-strength fiber-reinforced concrete is used for printing, integrating it with the subsequent cast layers. However, the interfacial bond strength between the 3D-printed formwork and the subsequent concrete pouring is typically lower than with traditional formwork, leading to interlayer delamination. Separation of the formwork from the concrete can compromise subsequent corrosion resistance, waterproofing, and aesthetics.

[0004] Therefore, there is an urgent need to study a formwork-free technology that is not easy to separate from the concrete and is easy and quick to operate. Summary of the Invention

[0005] The object of the present invention is to provide a square silo wall structure that does not require formwork removal. Its formwork is hooked and connected to the post-cast concrete through trapezoidal vertical bars, and is connected to the vertical bars of the steel cage through C-shaped slots and elastic metal clips on the trapezoidal vertical bars. After the post-cast concrete solidifies, the elastic metal clips are transformed into a rigid structure to achieve the connection between the trapezoidal vertical bars and the steel cage, so that the formwork and the post-cast concrete have a strong connection strength.

[0006] The technical solution of the present invention is as follows: A mold-free square silo wall structure includes: reinforcement cage, which includes interconnected vertical and horizontal bars; The inner and outer formworks are symmetrically arranged, and a pouring cavity for pouring concrete is formed between the inner and outer formworks. The steel cage is located in the pouring cavity. The inner and outer formworks both include a plate body. A plurality of hook connection columns are arranged at intervals on the inner surface of the plate body. The cross section of the hook connection column is trapezoidal, and its cross section gradually increases from the plate body outward, so as to utilize the hook connection column to hook and connect with the post-cast concrete. The length of the hook connection column extends in the vertical direction, and a C-shaped slot is provided on the outer end surface of the hook connection column. The length of the C-shaped slot extends along the length direction of the hook connection column. The C-shaped slot is symmetrically connected to the groove edges on both sides with elastic metal clips. The length of the elastic metal clip is consistent with the length of the C-shaped slot. The cross-section of the elastic metal clip is an arc structure surrounded by a first section, a raised portion and a second section. The arc-shaped raised portion extends toward the notch of the C-shaped slot. The two symmetrical first sections form a necking structure, and the two second sections form a trumpet-shaped guide structure. The vertical ribs can be guided by the guide structure to slide between the necking structure and the C-shaped slot. After the post-cast concrete solidifies, the elastic metal clip cannot be deformed to achieve locking of the vertical ribs.

[0007] Based on the above solution, a further improvement is provided as follows: the second section of the elastic metal clip is provided with a barb section, which bends from the second section toward the first section. The provision of the barb section ensures that the connection between the elastic metal clip and the concrete does not rely solely on the strength of the second section. The provision of the barb section enhances the grip of the second section by leveraging the connection between the barb section and the concrete, thus increasing the overall load-bearing capacity of the elastic metal clip, making it less likely to break away from the concrete and further strengthening the connection between the elastic metal clip and the concrete.

[0008] Based on the above solution, a further improvement is made as follows: the first section of the elastic metal clip is the elastic portion, while the second section, the raised portion, and the barbed portion are the rigid portions. By designing only the first section as the elastic portion to accommodate deformation when the vertical bar is inserted, while the remaining sections are rigid, deformation that could cause the vertical bar to detach from the C-shaped slot is minimized. This structure further enhances its rigidity while ensuring sufficient elastic force before pouring, thereby strengthening the overall connection strength between it and the concrete.

[0009] Based on the above solution, a further improvement is made by connecting the inner and outer formwork panels via multiple spacer rods of set lengths. These spacer rods not only ensure that the spacing between the inner and outer formwork panels remains constant, but also increase the strength of the connection between the two panels, thereby enhancing the overall strength and integrity of the wall.

[0010] Based on the above solution, a further improvement is provided as follows: multiple connecting strips are spaced apart on the inner surfaces of the inner and outer formwork panels. These connecting strips are arranged parallel to and staggered with the hooking connecting posts. Multiple connecting holes are spaced apart along the length of the connecting strips, and the distance connecting rods are connected to a pair of symmetrical connection holes. The provision of the connecting strips not only facilitates the connection of the distance connecting rods, but also acts like a reinforcing rib, strengthening the inner and outer formwork panels and improving the overall load-bearing capacity.

[0011] Based on the above solution, a further improvement is made as follows: the connecting hole is a gourd hole, and the distance connecting rod is hooked into the gourd hole through a T-shaped head at the end. The connecting rod is threadedly connected by two T-shaped screws through a central screw sleeve. This structure makes it easier and faster to determine the distance between the inner and outer templates, and the provision of the screw sleeve facilitates the adjustment of the distance, that is, the adjustment of the distance between the inner and outer templates.

[0012] Based on the above solution, a further improvement is made as follows: the hook-connecting column of the inner template is provided with vertical air holes extending along its length. The inner template plate body has multiple air outlet holes spaced vertically corresponding to the vertical air holes. The air outlet holes are connected to the side of the inner template plate body facing the interior of the silo, and each air outlet hole is connected to the vertical air holes. The arrangement of the vertical air holes and air outlet holes facilitates fumigation, ventilation, nitrogen flow, and moisture extraction of the grain in the silo. Furthermore, because the vertical air holes and air outlet holes are evenly distributed within the silo, the gas is evenly distributed throughout the silo, ensuring uniformity.

[0013] Based on the above solution, a further improvement is provided, including a square frame base disposed at the bottom of the silo, with an annular air duct disposed on the frame base. The annular air duct is connected to each vertical air hole in the silo wall. The annular air duct has a central air hole extending outside the silo for connection to an air supply or exhaust device. The arrangement of the square frame base and its annular air duct facilitates the convergence or distribution of airflow, allowing a single air supply or exhaust device to supply or exhaust air to the entire silo without loss of uniformity during operation.

[0014] Based on the above solution, further improvements are made as follows: the inner and outer templates are extruded from high-strength engineering plastics along the height direction, or are processed from FRP materials.

[0015] The beneficial effects of this technical solution are as follows: when a square silo wall structure without disassembly is used, the inner and outer templates are assembled at the set position. After the positions of the inner and outer templates are locked, the steel cage assembled according to the design size is installed in the casting cavity between the inner and outer templates, so that the vertical bars of the steel cage are respectively correspondingly inserted into the C-shaped slots to position the steel cage, and at the same time, the template and the steel cage are fixedly connected. The principle of the clamping is as follows: the vertical bars of the steel cage are arranged vertically and approach the C-shaped slots in the radial direction. First, they pass through the second part of the elastic metal clip. The trumpet-shaped guide structure surrounded by the segments is used to guide the vertical bars. As the vertical bars move, the first section of the elastic metal clip is deformed, which increases the distance between the protrusions. Then the steel bars pass over the protrusions and enter between the shrinkage structure surrounded by the first section and the C-shaped slot. At this time, the elastic metal clip temporarily binds the vertical bars in the C-shaped slot by its elastic force. Then concrete is poured into the casting cavity between the inner and outer templates, and the concrete is vibrated to fill the casting cavity. When the concrete solidifies, a square is formed. The wall of the silo, and the corresponding surfaces of the inner and outer formwork plates constitute the wall surface of the silo wall. After the concrete solidifies, the wrapped elastic metal clips no longer have deformation space, so that they change from elastic to rigid. That is, the elastic metal clips at this time cannot be deformed due to the restriction of the solidified concrete, and they are transformed into a rigid structure for positioning and locking the vertical reinforcement, ensuring that the vertical reinforcement will not easily fall out of the C-shaped slot, ensuring the stability of the connection between the formwork and the vertical reinforcement, and the formwork is not easy to detach from the concrete structure. At the same time, since the concrete also fills the periphery of the hook connection column, the trapezoidal structure of the hook connection column can form a hook connected to the concrete, that is, the hook connection column itself can also be directly hooked and connected to the concrete, further improving the connection strength between the formwork and the concrete. It can be seen that the formwork and concrete of the present application can rely on the two-stage hook connection to form a more stable and reliable integrated connection structure. The formwork can be used as part of the silo wall for waterproofing, anti-seepage and anti-corrosion, and also has a certain load-bearing function, especially the hook connection column on its plate body itself has load-bearing capacity. Compared to the existing technology, the solution of this application is easy to cast, does not require demolding, and uses a multi-level hook connection structure between the formwork and the concrete. The connection is more stable and reliable, and the integrity is stronger. It is difficult for the subsequent formwork to fall off and peel off from the concrete. The elastic metal clip of this application is combined with the concrete to achieve elasticity before casting to facilitate the clamping of the vertical reinforcement, and rigidity after casting to facilitate the locking of the vertical reinforcement. The elastic metal clip and the hook connection part are both long strip structures extending in the height direction. The hook connection area is larger and the generated connection force is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a specific embodiment of a mold-free square silo wall structure of the present invention; Figure 2 for Figure 1A partial enlarged view of point A in the middle; Figure 3 for Figure 1 A partial enlarged view of point B in the middle; Figure 4 is a schematic diagram of the three-dimensional structure of the connecting strip and the corresponding connecting hole; Figure 5 for Figure 1 A partial enlarged view of point C in the middle; Figure 6 This is a structural diagram of the connection between the square silo and the square frame base; Figure 7 for Figure 6 A partial enlarged view of point D in the middle; Figure 8 It is a top sectional view of the frame base; Figure 9 for Figure 8 A partial enlarged view of point E in the middle; In the figure: 1-square silo, 11-side wall of square silo, 2-square frame base, 21-annular air duct, 211-main air hole, 3-rebar cage, 31-vertical reinforcement, 32-horizontal reinforcement, 4-inner formwork, 5-outer formwork, 6-casting cavity, 7-hook connecting column, 71-C-shaped slot, 72-elastic metal clip, 721-first section, 722-protrusion, 723-second section, 724-barb section, 73-vertical air hole, 74-air outlet, 8-connecting strip, 81-connecting hole, 9-fixed distance connecting rod, 91-screw sleeve, 92-T-type screw, 10-concrete. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0019] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0020] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0021] A specific embodiment of the present invention's free-mold square silo wall structure: Figure 1 As shown, the wall structure of the formwork-free square silo includes an inner formwork 4, an outer formwork 5, a distance connecting rod 9 and a steel cage 3.

[0022] The steel cage 3 is of existing technology, and includes vertical bars 31 and transverse bars 32 connected to each other, forming a rectangular frame structure as a whole, serving as the main load-bearing structure of the side wall of the square silo 1.

[0023] like Figure 1As shown, the inner formwork 4 and the outer formwork 5 are symmetrically arranged, and the inner surface of the inner formwork 4 eventually constitutes the inner wall surface of the square silo 1, and the outer surface of the outer formwork 5 eventually constitutes the outer wall surface of the square silo 1. A pouring cavity 6 for pouring concrete is formed between the inner and outer formworks, and the steel cage 3 is located in the pouring cavity 6. The inner and outer formworks both include a plate body, and a plurality of hook connection columns 7 are arranged at intervals on the inner surface of the plate body. Each hook connection column 7 is arranged at intervals along the length direction of the plate body in the horizontal plane. The cross section of the hook connection column 7 is trapezoidal, and its cross section gradually increases from the plate body to the outside to form a hooking slope to cooperate with the post-cast concrete, so as to use the hook connection column 7 to hook and connect with the post-cast concrete. The length of the hook connection column 7 extends in the vertical direction. The hook connection column 7 is Solid structure, a C-shaped slot 71 is provided on the outer end face of the hook connecting column 7, the length of the C-shaped slot 71 extends along the length direction of the hook connecting column 7, and elastic metal clips 72 are symmetrically connected to the groove edges on both sides of the C-shaped slot 71. The elastic metal clips 72 are preferably made of thin steel plates and are connected to the hook connecting column 7 with a hook structure or a bolt structure. If the template is made of steel, the hook connecting column 7 and the hook connecting column 7 can be integrally formed or welded. The hook connecting column 7, the inner template 4, the outer template 5, and the connecting strip 8 can also be made of high-strength plastic. The length of the elastic metal clip 72 is consistent with the length of the C-shaped slot 71. The cross-section of the elastic metal clip 72 is an arc-shaped structure surrounded by a first section 721, a protrusion 722 and a second section 723. The arc-shaped protrusion 722 extends toward the notch of the C-shaped slot 71. The two symmetrical first sections 721 form a necking structure, and the two second sections 723 form a trumpet-shaped guide structure. The vertical rib 31 can slide into between the necking structure and the C-shaped slot 71 through the guidance of the guide structure. After the post-cast concrete solidifies, the elastic metal clip 72 cannot be deformed to achieve locking of the vertical rib 31.

[0024] like Figure 2 As shown, the second section 723 of the elastic metal clip 72 is provided with a barb section 724. In this embodiment, a barb section 724 is provided on each side of the second section 723. The barb section 724 bends from the second section 723 toward the first section 721 to form a barb-like shape. The provision of the barb sections 724 ensures that the connection between the elastic metal clip 72 and the concrete does not rely solely on the connection strength of the second section 723. The provision of the barb sections 724 and the connection between the barb sections 724 and the concrete enhance the grip of the second section 723, thereby increasing the overall load-bearing capacity of the elastic metal clip 72, making it less likely to detach from the concrete and further strengthening the connection between the elastic metal clip 72 and the concrete.

[0025] In other embodiments, the first section 721 of the elastic metal clip 72 is an elastic portion, while the second section 723, the raised portion 722, and the barbed portion 724 are rigid portions. By configuring only the first section 721 as an elastic portion to allow for deformation when the vertical bar 31 is inserted, while the remaining portions are rigid portions, deformation that could cause the vertical bar 31 to detach from the C-shaped slot 71 is minimized. This structure further enhances its rigidity while ensuring sufficient elastic force before pouring, thereby strengthening the overall connection strength between it and the concrete.

[0026] like Figure 1-5 As shown, the inner and outer formworks are connected by a plurality of fixed-distance connecting rods 9 of set lengths. The provision of the fixed-distance connecting rods 9, on the one hand, ensures that the spacing between the inner and outer formworks is maintained at the set value, and on the other hand, increases the connection strength between the inner and outer formworks, thereby improving the integral connection strength and integrity of the entire wall. A plurality of connecting strips 8 are also arranged at intervals on the inner surface of the plate body of the inner and outer formworks. The connecting strips 8 are staggered and arranged parallel to the hook connecting columns 7. A plurality of connecting holes 81 are arranged at intervals along the length direction on the connecting strips 8, and the fixed-distance connecting rods 9 are connected to a pair of symmetrical connecting holes 81. The provision of the connecting strips 8, on the one hand, facilitates the connection of the fixed-distance connecting rods 9, and on the other hand, it is similar to a reinforcing rib, which also strengthens the strength of the inner and outer formworks and improves the overall load-bearing capacity. The fixed-distance connecting rods 9 are hooked with the gourd hole through the T-shaped head at the end, and the connecting rods are threadedly connected by two T-screws 92 through the middle screw sleeve 91. This structure makes it more convenient and quick to determine the distance between the inner and outer templates, and the provision of the screw sleeve 91 can facilitate the adjustment of the distance, that is, facilitates the adjustment of the distance between the inner and outer templates.

[0027] like Figure 3 As shown, the hook connection column 7 of the inner template 4 is provided with vertical air holes 73 extending along its length. A plurality of air outlet holes 74 are spaced apart vertically on the plate body of the inner template 4 corresponding to the vertical air holes 73. The air outlet holes 74 communicate with the side surface of the plate body of the inner template 4 facing the interior of the silo 1, and each air outlet hole 74 communicates with the vertical air holes 73. The arrangement of the vertical air holes 73 and the air outlet holes 74 facilitates operations such as fumigation, ventilation, nitrogen flow, and moisture extraction of the grain in the silo 1. Furthermore, since the vertical air holes 73 and the air outlet holes 74 are evenly distributed within the silo 1, the gas is ensured to evenly affect all the materials in the silo 1, ensuring uniformity.

[0028] Furthermore, the silo 1 includes a frame base 2 disposed at the bottom thereof. This base 2 is provided with an annular airway 21, which communicates with each of the vertical air holes 73 within the silo wall. The annular airway 21 includes a central air hole 211 extending outside the silo 1 for communication with an air supply or exhaust device. The frame base 2 and its annular airway 21 facilitate convergence or distribution of airflow, enabling a single air supply or exhaust device to supply or exhaust air to the entire silo 1 without loss of uniformity.

[0029] The inner template 4 and the outer template 5 are formed by extruding high-strength engineering plastics in the height direction, or processed from FRP materials.

[0030] When the formwork-free square silo wall structure is in use, the inner formwork 4 and the outer formwork 5 are assembled at the set position. After the positions of the inner and outer formworks are locked, the steel cage 3 assembled according to the design size is installed in the casting cavity 6 between the inner and outer formworks, so that the vertical bars 31 of the steel cage 3 are respectively corresponding to the C-shaped slots 71 to position the steel cage 3 and also to fix the formwork and the steel cage 3. The principle of the clamping is as follows: the vertical bars 31 of the steel cage 3 are vertically arranged and radially approach the C-shaped slots 71. They first pass through the second section 723 of the elastic metal clip 72. The trumpet-shaped guide structure guides the vertical reinforcement 31 by means of the trumpet-shaped guide structure. As the vertical reinforcement 31 moves, the first section 721 of the elastic metal clip 72 is deformed, so that the distance between the protrusions 722 becomes larger, and then the steel bar passes over the protrusion 722 and enters between the constriction structure surrounded by the first section 721 and the C-shaped slot 71. At this time, the elastic metal clip 72 temporarily restrains the vertical reinforcement 31 in the C-shaped slot 71 by means of its elastic force, and then concrete is poured into the casting cavity 6 between the inner and outer templates, and the concrete is vibrated to fill the casting cavity 6. When the concrete is After the soil solidifies, the wall of the square silo 1 is formed, and the corresponding surfaces of the inner and outer templates constitute the wall surface of the silo. After the concrete solidifies, the wrapped elastic metal clip 72 no longer has deformation space, so it changes from elastic to rigid. That is, the elastic metal clip 72 at this time cannot be deformed due to the restriction of the solidified concrete, and it is transformed into a rigid structure for positioning and locking the vertical reinforcement 31, ensuring that the vertical reinforcement 31 will not easily fall out of the C-shaped slot 71, ensuring the stability of the connection between the template and the vertical reinforcement 31, and the template is not easy to separate from the concrete structure. At the same time, Because the concrete also fills the perimeter of the hooking connection column 7, the trapezoidal structure of the hooking connection column 7 can form a hook that connects to the concrete. That is, the hooking connection column 7 itself can also directly hook and connect to the concrete, further improving the connection strength between the formwork and the concrete. As can be seen, the formwork and concrete of the present application can form a more stable and reliable integrated connection structure through a two-stage hook connection. The formwork not only serves as a part of the warehouse wall for waterproofing, anti-seepage, and corrosion resistance, but also has a certain load-bearing function. In particular, the hooking connection column 7 on the plate body itself has a load-bearing capacity. Compared with the existing technology, the solution of the present application is convenient for casting, does not require demolding, and adopts a multi-stage hook connection structure between the formwork and the concrete, resulting in a more stable and reliable connection and stronger integration. The formwork is difficult to separate from the concrete later. The elastic metal clip 72 of the present application is combined with the concrete, achieving elasticity before casting to facilitate the engagement of the vertical reinforcement 31, and rigidity after casting to facilitate the locking of the vertical reinforcement 31. The elastic metal clip 72 and the hook connection portion are both long strip structures extending in the height direction, resulting in a larger hook connection area and a stronger connection force.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A square silo wall structure that does not require demolding, comprising: reinforcement cage, which includes interconnected vertical and horizontal bars; It is characterized by further comprising: The inner and outer formworks are symmetrically arranged, and a pouring cavity for pouring concrete is formed between the inner and outer formworks. The steel cage is located in the pouring cavity. The inner and outer formworks both include a plate body. A plurality of hook connection columns are arranged at intervals on the inner surface of the plate body. The cross section of the hook connection column is trapezoidal, and its cross section gradually increases from the plate body outward, so as to utilize the hook connection column to hook and connect with the post-cast concrete. The length of the hook connection column extends in the vertical direction, and a C-shaped slot is provided on the outer end surface of the hook connection column. The length of the C-shaped slot extends along the length direction of the hook connection column. The C-shaped slot is symmetrically connected to the groove edges on both sides with elastic metal clips. The length of the elastic metal clip is consistent with the length of the C-shaped slot. The cross-section of the elastic metal clip is an arc structure surrounded by a first section, a raised portion and a second section. The arc-shaped raised portion extends toward the notch of the C-shaped slot. The two symmetrical first sections form a necking structure, and the two second sections form a trumpet-shaped guide structure. The vertical ribs can be guided by the guide structure to slide between the necking structure and the C-shaped slot. After the post-cast concrete solidifies, the elastic metal clip cannot be deformed to achieve locking of the vertical ribs.

2. The mold-free square silo wall structure according to claim 1 is characterized in that: The second section of the elastic metal clip is provided with a barb section, which is bent from the second section toward the first section.

3. The mold-free square silo wall structure according to claim 2 is characterized in that: The first section of the elastic metal clip is the elastic part, and the second section, the raised part and the barb section are the rigid parts.

4. The mold-free square silo wall structure according to claim 1 is characterized in that: The inner and outer formwork are connected by multiple fixed-distance connecting rods of set lengths.

5. The mold-free square silo wall structure according to claim 4 is characterized in that: A plurality of connecting strips are arranged at intervals on the inner surface of the inner and outer templates. The connecting strips are staggered and parallel to the hook connecting columns. A plurality of connecting holes are arranged at intervals along the length direction on the connecting strips. The distance connecting rods are connected to a pair of symmetrical connecting holes.

6. The mold-free square silo wall structure according to claim 5, characterized in that: The connecting hole is a gourd hole, and the fixed-distance connecting rod is hooked with the gourd hole through a T-shaped head at the end, and the connecting rod is threadedly connected by two T-shaped screws through a middle screw sleeve.

7. The mold-free square silo wall structure according to claim 1 is characterized in that: The hook connecting column of the inner template is provided with vertical air holes extending along its length direction. The plate body of the inner template is provided with multiple air outlet holes spaced apart in the vertical direction corresponding to the vertical air holes. The air outlet holes are connected to the side surface of the plate body of the inner template facing the square silo, and each air outlet hole is connected to the vertical air hole.

8. The mold-free square silo wall structure according to claim 7, characterized in that: It includes a square frame base arranged at the bottom of the square silo, on which an annular air duct is arranged. The annular air duct is connected to the vertical air holes in the wall of the square silo at the same time. The annular air duct has a main air hole extending outside the square silo for connecting with air supply equipment or air extraction equipment.

9. The mold-free square silo wall structure according to claim 1, characterized in that: The inner and outer templates are made of high-strength engineering plastics extruded along the height direction, or processed from FRP materials.

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