Formwork-free construction method for constructional column

Abstract

The invention discloses a constructional column formwork-free construction method, which relates to the technical field of constructional column construction, and comprises the following steps: designing and manufacturing U-shaped building blocks, building a wall body, designing and manufacturing a novel mold, installing a pouring assembly, pouring and vibrating a constructional column, removing a pouring groove, and curing concrete. According to the construction method, U-shaped building blocks are adopted for constructional column construction, a novel mold is adopted on the upper portion, dustpan opening construction is omitted, the key technical point is that dustpan opening construction is omitted, the quality problems of root rotting, honeycombs, pitted surfaces, mold expansion and the like of wall constructional column concrete are effectively solved, the integrity and flatness of the surface of a wall are guaranteed, labor input for follow-up chiseling is avoided, and the construction efficiency is improved. And material waste and construction waste are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of structural column construction, and in particular to a formwork-free construction method for structural columns. Background Art

[0002] In the construction of building infill walls, structural columns are usually constructed using wooden formwork and wooden square formwork. This formwork method requires multiple formworks, slows the construction speed, and the top of the structural column is "cast first and then chiseled", which causes material waste and generates construction waste. The labor input for chiseling is high; there are certain safety hazards when workers climb up for a long time with their hands in the air.

[0003] Combined with the current status of structural column construction in the industry and through actual application in the construction process of structural columns, the structural columns are built with U-shaped blocks, and a new type of mold is used on the upper part to avoid the construction of the dustpan mouth, which effectively solves the shortcomings of traditional construction methods and ensures the molding quality of the structural columns. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a formwork-free construction method for structural columns.

[0005] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0006] A formwork-free construction method for structural columns, characterized in that it comprises the following steps:

[0007] S1. Design and production of U-shaped blocks

[0008] According to the detailed plan of the structural column layout, the structural columns are set up. The thickness of the infill wall is 200mm, the width of the structural column is 200mm, and the infill wall is left as a tooth joint at the position of the structural column. It is left from the root according to the principle of "retreat first and advance later". The height dimension of each tooth joint is 200mm and the concave and convex dimension is 60mm. The wall tie reinforcement is 2 HPB300 steel bars with a diameter of 6.5mm. The vertical spacing including the height of the mortar joint is 410mm-420mm.

[0009] The U-shaped blocks are designed according to the tooth joint size drawings, and are cast with 6.5 diameter steel mesh and C30 fine stone concrete. The middle is a hollow structure; the thickness of the side walls is 25mm, which is the thickness of the structural column protection layer. The standard laboratory curing is 28 days, and the strength test is qualified before it can be built together with the wall;

[0010] S2. Wall construction

[0011] When building the wall, U-shaped blocks are used at the designed position of the structural column to build together with the wall. U-shaped blocks of corresponding sizes are built according to the principle of retreating first and advancing later. During the wall building process, a long masonry line is drawn and a skin number rod is set. The two sides of the U-shaped block side wall are flush with the wall.

[0012] S3. Design and production of new molds

[0013] 1) New mold design

[0014] The new mold includes a metal base, a metal chute, a metal plug, a concrete casting trough, and a tie rod. The metal base is fixedly installed on the wall by four tension bolts. A U-shaped casting port is opened on the metal base. A pair of metal chutes are arranged on both sides of the U-shaped casting port. A metal plug is arranged between the pair of metal chutes. The metal plug is connected to the concrete casting trough through a tie rod and four tie rod holes. The four tie rod holes are staggered and fixed at the edges of the concrete casting trough and the metal plug. A handle is arranged on the concrete casting trough.

[0015] Calculate the amount of concrete in the reserved height according to the reserved height from the block to the bottom of the beam, and then calculate the amount of concrete in the casting trough according to the scale line position on the metal base. After the two are offset, the metal plug needs to be marked to the scale line position;

[0016] The initial bottom position of the metal plug is 16 cm. The bottom position of the metal plug is determined according to the actual reserved height of the upper part of the block, and concrete is poured. After the structural column concrete is poured densely, the tie rod reinforcement is taken out, and the concrete pouring trough is removed. The concrete pouring of the structural column is completed and curing begins.

[0017] 2) New mold production

[0018] The new molds are mass-produced by professional processing manufacturers, and the project department's technical personnel are stationed in the factory to supervise the production. Any questions during the process are communicated and resolved in a timely manner;

[0019] Before parts processing, the project technical leader and the project on-site technical personnel should give instructions to the operators, and the operators should be familiar with the design drawings and be prepared for each process;

[0020] Lofting and cutting are carried out according to the design drawings, and margins are reserved as required; note that the upper width of the casting trough plate is 300mm, the lower width is 310mm, and 5mm is reserved on both sides to ensure that after rolling and forming, when both sides are tightly fitted with the template, there is a 3mm gap at the lower mouth, so that the metal plug can pass smoothly;

[0021] The plate cutting adopts mechanical cutting method, the pipe and rod are cut by milling machine, the burrs and burrs after cutting should be cleaned up, and the holes of parts are made by mechanical drilling;

[0022] S4. Installation of casting components

[0023] Before assembling components, assemblers should be familiar with the design details and check that the material, specification, appearance, size and quantity of the assembled parts meet the design requirements;

[0024] The connection between the metal parts such as the slideway and screw holes and the carbon steel plate is fixed by welding;

[0025] Use the tension bolts to tie the new mold base to the wall in two directions. Drill holes in the wall, insert the tension bolts into the base fixing holes, and then pass them out from the other side of the wall. Fix them with a wrench.

[0026] Insert the concrete pouring trough into the base slideway so that it can slide up and down through the slideway as the concrete is poured, and check whether the base is installed firmly;

[0027] The base installation acceptance is attended by the project technical quality personnel, and it can be used only after passing the acceptance;

[0028] S5. Casting and vibrating of structural columns

[0029] According to the reserved height from the block to the bottom of the beam, calculate the amount of concrete in the reserved height. Take the reserved opening height of 16cm as an example: (0.2x0.2x0.16÷2=0.0064m 3 ), and then calculate the amount of concrete in the casting trough by the position of the base scale line 0.20x0.30x0.23 (the height of the casting trough is 26cm, and there is a 3cm height difference between the inside and outside of the trough) ÷ 2 = 0.0069m 3 , minus the water loss, calculate the metal plug to the scale line after the two are offset, and then pour the concrete;

[0030] Before pouring concrete, water the structural column to moisten it, clean the debris left in the formwork, and let it flow out from the reserved overflow hole at the bottom of the mold;

[0031] The overflow holes and gaps at the bottom of the mold are sealed with 1:3 cement mortar;

[0032] When pouring concrete for structural columns, use a small hand-held inserted vibrator to vibrate while pouring. If necessary, use a hand-held rubber hammer to assist in vibration to ensure that the concrete is poured densely.

[0033] The amount of concrete reserved on the upper part of the block is roughly the same as the amount of concrete in the casting trough. After the concrete pouring is completed, the casting trough is removed;

[0034] S6. Casting trough removal and concrete curing

[0035] After the structural column concrete is formed, there is a concrete bulge with a thickness of about 8mm at the pouring mouth, which can be covered by subsequent plastering construction without affecting the quality of plastering construction and the smoothness of the wall appearance.

[0036] Preferably, the metal base is made of 500×450×2mm steel plate, with a 300×250mm U-shaped pouring port in the middle; the vertical area of ​​the metal base is engraved with scale lines, and the scale line setting range is determined according to the height of the reserved opening of the block.

[0037] Preferably, the concrete casting trough is designed to be cut from 2mm thick steel plate and cold-bent, with a casting opening width of 300mm and an inner side of the casting upper opening 50mm higher than the outer side. It is used for concrete pouring and can be disassembled and removed after pouring, and the casting trough mold can be used in a turnover manner.

[0038] Preferably, the metal slide groove is welded to the designed position of the metal base by a 30×250×2mm steel plate, the thickness of the metal plug is 2mm, and the depth of the metal slide groove is 2mm greater than the thickness of the metal plug to ensure that the metal plug slides smoothly up and down.

[0039] Preferably, the metal plug is rolled into an L-shape and can slide up and down in the metal chute to open or close the U-shaped pouring port. The upper end section of the metal plug is appropriately polished into an inclined surface and a blade shape to reduce resistance when sliding upward.

[0040] Preferably, the pull rod is made of φ8 steel bars and is L-shaped, and the pull rod hole is made of 4 nuts with an inner diameter of 5 mm.

[0041] Preferably, the strength of the steel used for the new mold is HRC65, the welding method is arc welding, and the weld grade is level three.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. In the present invention, the new mold is mass-produced by the manufacturer and installed on site, which has a fast production and installation speed and saves the production and installation period;

[0044] It avoids the subsequent labor input of chiseling, reduces material waste and construction waste, and maintains green construction;

[0045] 2. In the present invention, when the dustpan mouth protrudes from the wall concrete, the operator needs to operate with both hands for a long time and work in the air, which poses a great safety hazard for working at height. The application of this method does not require the chiseling process, which ensures the personal safety of the operator;

[0046] After the concrete pouring of the structural column is completed, the metal casting trough mold is removed, cleaned and recycled, with a high turnover rate; after the construction of all structural columns is completed, the new mold can be transferred to other projects for continued use, and the scrapped mold can be recycled as scrap metal;

[0047] 3. In the present invention, the quality problems of rotten roots, honeycombs, rough surfaces and bulging molds in the concrete of the wall structural columns are effectively solved, so that the wall surface has good integrity, uniform layout, and is horizontal and vertical.

[0048] It reduces the problems that are likely to occur during the handover of work processes, improves construction efficiency, and ensures safe and civilized construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0050] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0051] Figure 2 It is the design drawing of the U-shaped building block of the present invention;

[0052] Figure 3 A three-dimensional diagram of the U-shaped building block of the present invention;

[0053] Figure 4 It is a schematic diagram of the novel mold structure of the present invention;

[0054] Figure 5 It is a three-dimensional front view of the novel mold of the present invention;

[0055] Figure 6 It is a side view of the novel mold of the present invention;

[0056] Figure 7 It is a three-dimensional diagram of the concrete pouring trough and the tie rod of the present invention;

[0057] Figure 8 A three-dimensional diagram of the metal base of the present invention;

[0058] Fig. 9 It is a schematic diagram of a concrete pouring trough of the present invention;

[0059] Fig.10 It is a schematic diagram of the metal plug and the metal slide groove of the present invention;

[0060] Fig.11 This is a schematic diagram of the installation of the template base of the present invention;

[0061] Fig.12 It is a schematic diagram of the concrete pouring trough of the present invention being installed through a metal chute;

[0062] Fig.13 It is a schematic diagram of dismantling the novel mold of the present invention;

[0063] Serial numbers in the figure: 1. Metal base; 2. Metal slide; 3. Concrete casting trough; 4. Handle; 5. Metal plug; 6. Scale line; 7. Pull rod hole; 8. Pull rod. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0065] Embodiment: This embodiment provides a construction method for structural columns without formwork support, see Figure 1-13 , specifically, the following steps are included:

[0066] S1. Design and production of U-shaped blocks

[0067] According to the detailed plan of the structural column layout, the structural columns are set up. The thickness of the infill wall is 200mm, the width of the structural column is 200mm, and the infill wall is left as a tooth joint at the position of the structural column. It is left from the root according to the principle of "retreat first and advance later". The height dimension of each tooth joint is 200mm and the concave and convex dimension is 60mm. The wall tie reinforcement is 2 HPB300 steel bars with a diameter of 6.5mm. The vertical spacing including the height of the mortar joint is 410mm-420mm.

[0068] The U-shaped blocks are designed according to the tooth joint size drawings, and are cast with 6.5 diameter steel mesh and C30 fine stone concrete. The middle is a hollow structure; the thickness of the side walls is 25mm, which is the thickness of the structural column protection layer. The standard laboratory curing is 28 days, and the strength test is qualified before it can be built together with the wall;

[0069] S2. Wall construction

[0070] When building the wall, U-shaped blocks are used at the designed position of the structural column to build together with the wall. U-shaped blocks of corresponding sizes are built according to the principle of retreating first and advancing later. During the wall building process, a long masonry line is drawn and a skin number rod is set. The two sides of the U-shaped block side wall are flush with the wall.

[0071] S3. Design and production of new molds

[0072] 1) New mold design

[0073] The novel mold comprises a metal base 1, a metal chute 2, a metal plug 5, a concrete casting trough 3, and a tie rod 8. The metal base 1 is fixedly mounted on the wall by four tension bolts. A U-shaped casting port is provided on the metal base 1. A pair of metal chute 2 is provided on both sides of the U-shaped casting port. A metal plug 5 is provided between the pair of metal chute 2. The metal plug 5 is connected to the concrete casting trough 3 by the tie rod 8 and four tie rod holes 7. The four tie rod holes 7 are staggered and fixed at the edges of the concrete casting trough 3 and the metal plug 5. A handle 4 is provided on the concrete casting trough 3.

[0074] The strength of the steel used in the new mold is HRC65, the welding method is arc welding, the weld grade is level three, the metal base 1 is made of 500×450×2mm steel plate, and a 300×250mm U-shaped pouring port is set in the middle; the vertical area of ​​the metal base 1 is engraved with a scale line 6, and the setting range of the scale line 6 is determined according to the height of the reserved opening of the block;

[0075] The concrete pouring trough 3 is designed to be blanked with 2mm thick steel plate and cold-bent, with a pouring opening width of 300mm and an inner side of the pouring upper opening 50mm higher than the outer side. It is used for concrete pouring and can be disassembled and removed after pouring is completed, and the pouring trough mold can be used in a turnover manner;

[0076] The metal chute 2 is welded to the designed position of the metal base 1 by a 30×250×2mm steel plate. The thickness of the metal plug 5 is 2mm. The depth of the metal chute 2 is 2mm greater than the thickness of the metal plug 5, ensuring that the metal plug 5 slides up and down smoothly.

[0077] The metal plug 5 is rolled into an L-shape and can slide up and down in the metal chute 2 to open or close the U-shaped pouring port. The upper end section of the metal plug 5 is appropriately polished into an inclined surface and a blade shape to reduce the resistance when sliding upward; the pull rod 8 is made of φ8 steel bars and is L-shaped, and the pull rod hole 7 is made of 4 nuts with an inner diameter of 5mm;

[0078] According to the reserved height from the block to the bottom of the beam, calculate the amount of concrete in the reserved height, and then calculate the amount of concrete in the casting trough by the position of the scale line 6 on the metal base 1. After the two are offset, the metal plug 5 needs to be drawn to the position of the scale line 6;

[0079] The initial bottom position of the metal plug 5 is 16 cm. The bottom position of the metal plug 5 is determined according to the actual reserved height of the upper part of the block, and concrete is poured. After the structural column concrete is poured and compacted, the tie rod steel bars are taken out, and the concrete pouring trough 3 is removed. The pouring of the structural column concrete is completed and curing begins.

[0080] 2) New mold production

[0081] The new molds are mass-produced by professional processing manufacturers, and the project department's technical personnel are stationed in the factory to supervise the production. Any questions during the process are communicated and resolved in a timely manner;

[0082] Before parts processing, the project technical leader and the project on-site technical personnel should give instructions to the operators, and the operators should be familiar with the design drawings and be prepared for each process;

[0083] The layout and blanking are carried out according to the design drawings, and the margin is reserved as required; note that the upper width of the casting trough plate is 300mm, the lower width is 310mm, and 5mm is reserved on both sides to ensure that the two sides are closely fitted with the template after rolling and there is a 3mm gap at the lower end, so that the metal plug 5 can pass smoothly;

[0084] The plate cutting adopts mechanical cutting method, the pipe and rod are cut by milling machine, the burrs and burrs after cutting should be cleaned up, and the holes of parts are made by mechanical drilling;

[0085] S4. Installation of casting components

[0086] Before assembling components, assemblers should be familiar with the design details and check that the material, specification, appearance, size and quantity of the assembled parts meet the design requirements;

[0087] The connection between the metal parts such as the slideway and screw holes and the carbon steel plate is fixed by welding;

[0088] Use the tension bolts to tie the new mold base to the wall in two directions. Drill holes in the wall, insert the tension bolts into the base fixing holes, and then pass them out from the other side of the wall. Fix them with a wrench.

[0089] Insert the concrete pouring trough into the base slideway so that it can slide up and down through the slideway as the concrete is poured, and check whether the base is installed firmly;

[0090] The base installation acceptance is attended by the project technical quality personnel, and it can be used only after passing the acceptance;

[0091] S5. Casting and vibrating of structural columns

[0092] According to the reserved height from the block to the bottom of the beam, calculate the amount of concrete in the reserved height. Taking the reserved opening height of 16cm as an example: 0.2x0.2x0.16÷2=0.0064m 3 Then calculate the amount of concrete in the casting trough by the position of the base scale line 0.20x0.30x0.23 The height of the casting trough is 26cm, and there is a 3cm height difference between the inside and outside of the trough ÷ 2 = 0.0069m 3 , minus the water loss, calculate the metal plug 5 to the scale line position after the two are offset, and then pour the concrete;

[0093] Before pouring concrete, water the structural column to moisten it, clean the debris left in the formwork, and let it flow out from the reserved overflow hole at the bottom of the mold;

[0094] The overflow holes and gaps at the bottom of the mold are sealed with 1:3 cement mortar;

[0095] When pouring concrete for structural columns, use a small hand-held inserted vibrator to vibrate while pouring. If necessary, use a hand-held rubber hammer to assist in vibration to ensure that the concrete is poured densely.

[0096] The amount of concrete reserved on the upper part of the block is roughly the same as the amount of concrete in the casting trough. After the concrete pouring is completed, the casting trough is removed;

[0097] S6. Casting trough removal and concrete curing

[0098] After the structural column concrete is formed, there is a concrete bulge with a thickness of about 8mm at the pouring mouth, which can be covered by subsequent plastering construction without affecting the quality of plastering construction and the smoothness of the wall appearance.

[0099] This construction method uses U-shaped blocks for the construction of structural columns, and a new type of mold is used on the upper part. The key technical point is to eliminate the construction of the dustpan mouth. It can effectively solve the quality problems such as rotten roots, honeycombs, rough surfaces and bulging molds in the concrete of the wall structural columns, and the integrity and flatness of the wall surface are also guaranteed, avoiding the subsequent manual input of chiseling and reducing material waste and construction waste.

[0100] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A formwork-free construction method for structural columns, characterized in that: The following steps are involved: S1. Design and production of U-shaped blocks According to the detailed plan of the structural column layout, the structural columns are set up. The thickness of the infill wall is 200mm, the width of the structural column is 200mm, and the infill wall is left as a tooth joint at the position of the structural column. It is left from the root according to the principle of "retreat first and advance later". The height dimension of each tooth joint is 200mm and the concave and convex dimension is 60mm. The wall tie reinforcement is 2 HPB300 steel bars with a diameter of 6.5mm. The vertical spacing including the height of the mortar joint is 410mm-420mm. The U-shaped blocks are designed according to the tooth joint size drawings, and are cast with 6.5 diameter steel mesh and C30 fine stone concrete. The middle is a hollow structure; the thickness of the side walls is 25mm, which is the thickness of the structural column protection layer. The standard laboratory curing is 28 days, and the strength test is qualified before it can be built together with the wall; S2. Wall construction When building the wall, U-shaped blocks are used at the designed position of the structural column to build together with the wall. U-shaped blocks of corresponding sizes are built according to the principle of retreating first and advancing later. During the wall building process, a long masonry line is drawn and a skin number rod is set. The two sides of the U-shaped block side wall are flush with the wall. S3. Design and production of new molds 1) New mold design The novel mold comprises a metal base (1), a metal slide groove (2), a metal plug (5), a concrete casting groove (3), and a tie rod (8). The metal base (1) is fixedly mounted on a wall by four tension bolts. A U-shaped casting port is provided on the metal base (1). A pair of metal slide grooves (2) are provided on both sides of the U-shaped casting port. A metal plug (5) is provided between the pair of metal slide grooves (2). The metal plug (5) is connected to the concrete casting groove (3) by a tie rod (8) and four tie rod holes (7). The four tie rod holes (7) are staggered and fixedly connected to the edges of the concrete casting groove (3) and the metal plug (5). A handle (4) is provided on the concrete casting groove (3). According to the reserved height from the block to the bottom of the beam, the amount of concrete in the reserved height is calculated, and then the amount of concrete in the casting trough is calculated by the position of the scale line (6) on the metal base (1). After the two are offset, the metal plug (5) needs to be drawn to the position of the scale line (6); The initial bottom position of the metal plug (5) is 16 cm. The bottom position of the metal plug (5) is determined according to the actual reserved height of the upper part of the block, and concrete is poured. After the structural column concrete is poured densely, the tie rod reinforcement is taken out, and the concrete pouring trough (3) is removed. The pouring of the structural column concrete is completed and curing begins. 2) New mold production The new molds are mass-produced by professional processing manufacturers, and the project department's technical personnel are stationed in the factory to supervise the production. Any questions during the process are communicated and resolved in a timely manner; Before parts processing, the project technical leader and the project on-site technical personnel should give instructions to the operators, and the operators should be familiar with the design drawings and be prepared for each process; The layout and cutting are carried out according to the design drawings, and margins are reserved as required; note that the width of the upper opening of the casting trough plate is 300mm, the width of the lower opening is 310mm, and 5mm is reserved on both sides to ensure that after rolling and forming, when both sides are tightly fitted with the template, there is a 3mm gap at the lower opening, so that the metal plug (5) can pass smoothly; The plate cutting adopts mechanical cutting method, the pipe and rod are cut by milling machine, the burrs and burrs after cutting should be cleaned up, and the holes of parts are made by mechanical drilling; S4. Installation of casting components Before assembling components, assemblers should be familiar with the design details and check that the material, specification, appearance, size and quantity of the assembled parts meet the design requirements; The connection between the metal parts such as the slideway and screw holes and the carbon steel plate is fixed by welding; Use the tension bolts to tie the new mold base to the wall in two directions. Drill holes in the wall, insert the tension bolts into the base fixing holes, and then pass them out from the other side of the wall. Fix them with a wrench. Insert the concrete pouring trough into the base slideway so that it can slide up and down through the slideway as the concrete is poured, and check whether the base is installed firmly; The base installation acceptance is attended by the project technical quality personnel, and it can be used only after passing the acceptance; S5. Casting and vibrating of structural columns According to the reserved height from the block to the bottom of the beam, calculate the amount of concrete in the reserved height. Take the reserved opening height of 16cm as an example: (0.2x0.2x0.16÷2=0.0064m 3 ), and then calculate the amount of concrete in the casting trough by the position of the base scale line 0.20x0.30x0.23 (the height of the casting trough is 26cm, and there is a 3cm height difference between the inside and outside of the trough) ÷ 2 = 0.0069m 3 , minus the water loss, calculate the two to offset each other, the metal plug (5) needs to be marked to the scale line position, and then pour the concrete; Before pouring concrete, water the structural column to moisten it, clean the debris left in the formwork, and let it flow out from the reserved overflow hole at the bottom of the mold; The overflow holes and gaps at the bottom of the mold are sealed with 1:3 cement mortar; When pouring concrete for structural columns, use a small hand-held inserted vibrator to vibrate while pouring. If necessary, use a hand-held rubber hammer to assist in vibration to ensure that the concrete is poured densely. The amount of concrete reserved on the upper part of the block is roughly the same as the amount of concrete in the casting trough. After the concrete pouring is completed, the casting trough is removed; S6. Casting trough removal and concrete curing After the structural column concrete is formed, there is a concrete bulge with a thickness of about 8mm at the pouring mouth, which can be covered by subsequent plastering construction without affecting the quality of plastering construction and the smoothness of the wall appearance.

2. A formwork-free construction method for structural columns according to claim 1, characterized in that: The metal base (1) is made of a 500×450×2 mm steel plate, with a 300×250 mm U-shaped pouring port in the middle; a scale line (6) is engraved on the vertical area of ​​the metal base (1), and the setting range of the scale line (6) is determined according to the height of the reserved opening of the building block.

3. A formwork-free construction method for structural columns according to claim 2, characterized in that: The concrete pouring trough (3) is designed to be blanked from 2 mm thick steel plate and cold-bent, with a pouring opening width of 300 mm and an inner side of the pouring upper opening 50 mm higher than an outer side. It is used for concrete pouring and can be disassembled and removed after pouring is completed, and the pouring trough mold can be used in a cyclic manner.

4. A formwork-free construction method for structural columns according to claim 3, characterized in that: The metal slide groove (2) is welded to the designed position of the metal base (1) by a 30×250×2mm steel plate. The thickness of the metal plug piece (5) is 2mm. The depth of the metal slide groove (2) is 2mm greater than the thickness of the metal plug piece (5), ensuring that the metal plug piece (5) slides up and down smoothly.

5. A formwork-free construction method for structural columns according to claim 4, characterized in that: The metal plug (5) is rolled into an L-shape and can slide up and down in the metal chute (2) to open or close the U-shaped pouring port. The upper end section of the metal plug (5) is appropriately ground into an inclined surface and a blade shape to reduce resistance when sliding upward.

6. A formwork-free construction method for structural columns according to claim 5, characterized in that: The pull rod (8) is made of φ8 steel bar and is L-shaped. The pull rod hole (7) is made of 4 nuts and has an inner diameter of 5 mm.

7. A formwork-free construction method for structural columns according to claim 6, characterized in that: The steel used for the new mold has a strength of HRC65, the welding method is arc welding, and the weld grade is level three.

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