Fair-faced concrete cylindrical stainless steel ribbed formwork structure and construction method thereof

Abstract

The invention discloses a fair-faced concrete cylindrical stainless steel ribbed formwork structure and a construction method thereof, and relates to the technical field of building engineering construction.The fair-faced concrete cylindrical stainless steel ribbed formwork structure comprises a formwork structure body, the formwork structure body is composed of two semicircular formwork bodies, a plurality of vertical rib plates are annularly and evenly fixed to the outer side of the formwork structure body, and a plurality of transverse rib plates are fixed to the outer side of the formwork structure body; and elastic sealing strips are arranged on two sides between the two groups of semicircular templates. In the aspect of the formwork structure, the semicircular formwork made of stainless steel is matched with the elastic sealing strips and the sealing rings, the problems that a traditional formwork is prone to deformation, rusting and slurry leakage are effectively solved, the smoothness of the concrete surface is guaranteed, the defects of color difference, air holes, voids, pitted surfaces and the like are reduced, and the overall rigidity of the formwork is enhanced through the vertical rib plates and the transverse rib plates; the template stability during concrete pouring is ensured, the influence of deformation on the quality of a column body is avoided, and compared with traditional manual measurement, the application of the laser positioning module greatly improves the template mounting precision and improves the finish effect of fair-faced concrete.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering construction, in particular to a plain concrete cylindrical stainless steel ribbed formwork structure and a construction method thereof. Background Art

[0002] In the field of construction engineering, the use of traditional formwork has many disadvantages. Wooden formwork is easy to deform and absorb water, which will cause color difference, air holes and honeycomb surface problems on the concrete surface. Ordinary steel formwork is easy to rust and the surface becomes rough after repeated use, which has a negative impact on the finish of the concrete. In addition, if the formwork joints are not handled properly, leakage is very likely to occur, resulting in joint marks on the concrete surface. At the same time, improper use of release agents can also cause pollution or uneven gloss on the concrete surface.

[0003] Some current solutions to the above-mentioned problems also have defects. Some patents use fiberglass formwork, but the elastic modulus of the material is small and it is easy to deform, which affects the appearance of the finished product. It also has stringent requirements for stacking and lifting conditions. When using plastic formwork, the rigidity is insufficient and it is difficult to ensure the verticality of the column. The solution of adding coating to ordinary steel formwork is that the coating is easy to wear and the maintenance cost is high. In terms of formwork installation precision control, the existing manual measurement method is affected by the error of formwork splicing, which will reduce the finishing effect of plain concrete. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a plain concrete cylindrical stainless steel ribbed formwork structure and a construction method thereof to solve the technical problems in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a stainless steel ribbed formwork structure for a plain concrete cylinder, comprising a formwork structure consisting of two sets of semicircular formworks, wherein the two sides of the two sets of semicircular formworks are fastened together by multiple sets of connecting bolts;

[0006] Both sides of the two sets of semicircular templates are provided with multiple sets of connection holes that match the connection bolts, and the connection holes are made of threaded holes with positioning pins, so as to achieve the effect of rapid alignment and fixation of the two sets of semicircular templates;

[0007] Multiple groups of vertical ribs are evenly fixed in a circular shape on the outside of the formwork structure, and multiple groups of transverse ribs are fixed on the outside of the formwork structure. The cross-section of the vertical ribs is rectangular, and the vertical ribs are made of long steel plates with a thickness of mm. The cross-section of the transverse ribs is circular, and the transverse ribs are made of steel ring plates with a thickness of mm, which improves the overall rigidity of the formwork structure.

[0008] Elastic sealing strips are provided on both sides between the two groups of semicircular templates, and multiple groups of connecting bolts pass through the elastic sealing strips, which serve to seal the template joints. A sealing ring is provided at the bottom of the template structure, and the sealing ring serves to seal between the template structure and the ground platform. Four groups of laser positioning modules are provided on the outside of each group of semicircular templates, and the laser positioning modules serve to position the template structure.

[0009] The laser positioning module consists of a laser emitter, a light spot receiver and a data processing terminal. A magnetic adsorption plate is fixed to the outside of the template structure, and the laser emitter of the laser positioning module is magnetically adsorbed on the magnetic adsorption plate. The laser emitter can emit vertical and horizontal reference laser beams. The light spot receiver can be fixed on an adjacent template structure or installed on a ground reference point. It has a built-in CCD sensor with a resolution of .mm. The data processing terminal can analyze the light spot offset in real time and generate calibration instructions. It contains a display screen and is wirelessly connected to a mobile device.

[0010] By adopting the above technical solution, in terms of formwork structure, the semicircular formwork made of stainless steel is combined with elastic sealing strips and sealing rings to effectively avoid the problems of traditional formwork that are easy to deform, rust, and leak, ensure the smoothness of the concrete surface, and reduce defects such as color difference, air holes, and honeycomb surfaces. The vertical ribs and transverse ribs enhance the overall rigidity of the formwork, ensure the stability of the formwork during concrete pouring, and avoid deformation that affects the quality of the column. The application of the laser positioning module greatly improves the installation accuracy of the formwork and the finishing effect of the plain concrete compared to traditional manual measurement. From the perspective of construction methods, strict operating specifications in each link ensure the construction quality, such as precise steel bar binding, standardized release agent application, and reasonable concrete pouring and maintenance process. On the whole, the formwork structure and its construction method improve the construction quality, reduce maintenance costs, reduce resource waste, and improve the beauty and durability of the building, with good economic and social benefits.

[0011] Furthermore, a lifting module is welded to the outside of the template structure, and the lifting module includes a welding plate and a lifting lug. The welding plate is welded to the outside of the template structure, and the lifting lug is welded to the outside of the welding plate, wherein the lifting module plays a role in lifting the template structure.

[0012] By adopting the above technical solution, the lifting module facilitates the lifting and transportation of the template structure by external lifting machinery.

[0013] A construction method for a plain concrete cylindrical stainless steel ribbed formwork structure comprises the following steps:

[0014] S1: Column reinforcement binding: Use galvanized wire to bind the clear water column reinforcement, with at least two wraps at each intersection, with the buckle and tail facing the inside of the component cross section. The wire should not exceed 1.5 times the diameter of the wire outside the stirrup. A positioning stirrup is installed at the top, middle, and bottom of the column. A vibrator positioning hoop is installed at the top of the column (made of φ6 steel bars and connected to the top stirrup. The position and number are determined by calculation);

[0015] S2: Stainless steel formwork structure installation

[0016] Apply release agent: Soak the applicator with a long-handled brush tool, apply it twice on the inner surface of the template structure, apply it in an arc shape without leaving any blank spaces, then soak a new tool thoroughly, wring it out and shake it, then apply it lightly again to ensure even coverage. Let it dry for at least 30 minutes after application;

[0017] Attach elastic sealing strips at the joints: After the release agent in the template structure has dried, clean the pasting area and attach the EPDM rubber sealing strips along the edge with a ruler to ensure adhesion;

[0018] Stainless steel formwork structure assembly: Lay a semicircular formwork flat, install the curved formwork with exposed seams at the bottom of the beam, and use a lifting machine to lift the other semicircular formwork at four points for splicing. First, install the locating pins, and add a locating pin for every two sets of connection holes. Check the flatness of the joints and the straightness of the sealing strips before installing the connecting bolts. After completion, remove the locating pins and install the remaining bolts. Slowly attach the sealing strip at the bottom of the formwork structure to avoid protrusion from the inner surface. Use the laser positioning module to fix the outer side of the formwork structure and correct the verticality.

[0019] S3: Concrete pouring: Control the concrete expansion within 550±50mm and the slump within 200±20mm. The mold temperature should be below 30℃. Avoid pouring during high temperature periods. The height of each layer should be about 50cm. The concrete should be laid and vibrated layer by layer. The pouring string pipe should be set deep into the column, and the bottom of the string pipe should not exceed 0.5 meters from the bottom of the column. Before pouring, the garbage in the formwork structure should be cleaned and the water should be drained. The construction joint at the bottom of the column should be chiseled to remove the floating slurry and exposed stones. Mortar of the same grade should be used for mortar connection and the paving thickness should be controlled. The inserted vibrating rod should be inserted quickly and removed slowly from the preset vibration positioning ring to vibrate layer by layer to avoid repeated vibration and missed vibration.

[0020] S4: Formwork removal, maintenance and protection of finished products: Remove the formwork 36-48 hours after pouring concrete for the column, use a hook plate to separate the formwork structure from the concrete surface, and lift the single-sided semicircular formwork from the work point at two points. Do not allow sharp objects to touch the surface of the concrete column. Spray the curing liquid immediately after demolding. The column surface is not wrapped for the time being. Before pouring the beam and slab structure concrete, wrap the column surface with geotextile to avoid spilling the slurry. Spray the protective liquid in time. Before dismantling the floor rack, use wooden boards to wrap the entire cross-section of the 1.8-meter-high part above the bottom of the clear water column for finished product protection.

[0021] In summary, the present invention mainly has the following beneficial effects: in terms of template structure, the present invention uses a semicircular template made of stainless steel with elastic sealing strips and sealing rings to effectively avoid the problems of easy deformation, rust and leakage of traditional templates, ensure the smoothness of the concrete surface, reduce defects such as color difference, air holes, and honeycomb surfaces, and the vertical ribs and transverse ribs enhance the overall rigidity of the template, ensure the stability of the template during concrete pouring, and avoid deformation that affects the quality of the column. The application of the laser positioning module greatly improves the template installation accuracy and the finishing effect of the plain concrete compared to traditional manual measurement. From the perspective of construction methods, strict operating specifications in each link ensure construction quality, such as precise steel bar binding, standardized release agent application, and reasonable concrete pouring and maintenance process. On the whole, the template structure and its construction method improve the construction quality, reduce maintenance costs, reduce resource waste, and improve the beauty and durability of the building, with good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a side view of the template structure of the present invention;

[0023] Figure 2 This is an enlarged view of the connection structure of the template structure of the present invention;

[0024] Figure 3 It is an enlarged bottom view of the present invention as a whole;

[0025] Figure 4 It is an enlarged top view of the present invention as a whole;

[0026] Figure 5 This is an enlarged side view of the lifting module of the present invention;

[0027] Figure 6 This is an enlarged view of the installation state of the laser positioning module of the present invention;

[0028] Figure 7 This is a flow chart of the first stage of the release agent brushing process of the present invention;

[0029] Figure 8 This is a flow chart of the second stage of the release agent brushing process of the present invention;

[0030] Figure 9 This is a working principle diagram of the laser positioning module of the present invention.

[0031] In the figure: 1. Template structure; 101. Semicircular template; 2. Connection hole; 3. Connection bolt; 4. Elastic sealing strip; 5. Vertical rib; 6. Horizontal rib; 7. Sealing ring; 8. Lifting module; 801. Welding plate; 802. Lifting ear; 9. Laser positioning module; 10. Magnet adsorption plate. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0033] The following describes an embodiment of the present invention based on its overall structure.

[0034] Example 1

[0035] A stainless steel ribbed formwork structure for a plain concrete cylinder, such as Figure 1-6 As shown, it includes a template structure 1;

[0036] The formwork structure 1 consists of two sets of semicircular formwork 101. The semicircular formwork 101 is made of 304 stainless steel with a thickness of 5mm. It has good corrosion resistance and smooth finish, and can effectively prevent rust from affecting the concrete surface. The two sets of semicircular formwork 101 are fastened on both sides by multiple sets of connecting bolts 3. The connecting bolts 3 are made of high-strength stainless steel bolts with a specification of M12 to ensure a firm connection.

[0037] Multiple groups of connection holes 2 are opened on both sides of the two groups of semicircular templates 101 to match the connection bolts 3. The connection holes 2 are threaded holes with positioning pins. The positioning pins have a diameter of 8 mm and are made of 45 steel. They have been quenched to improve hardness and wear resistance, so as to achieve rapid alignment and fixation of the two groups of semicircular templates 101.

[0038] Elastic sealing strips 4 are set on both sides between the two sets of semicircular templates 101. The elastic sealing strips 4 are made of EPDM rubber, which has good elasticity and weather resistance and can effectively seal the template joints to prevent leakage. A sealing ring 7 is set at the bottom of the template structure 1. The sealing ring 7 is made of EPDM rubber and has a thickness of 10mm. It plays a sealing role between the template structure 1 and the ground platform to prevent leakage at the bottom during concrete pouring.

[0039] Multiple groups of vertical ribs 5 are evenly fixed in a circular shape on the outside of the formwork structure 1. The vertical ribs 5 have a rectangular cross-section and are made of 6mm thick long steel plates. The material is Q345B. They are connected to the semicircular formwork 101 by welding. The welding spacing is 200mm to ensure the connection strength. Multiple groups of transverse ribs 6 are also fixed to the outside of the formwork structure 1. The transverse ribs 6 have a circular cross-section and are made of 8mm thick steel ring plates. The material is also Q345B. They are connected to the semicircular formwork 101 and the vertical ribs 5 by welding to improve the overall rigidity of the formwork structure 1 and prevent the formwork from deforming during the concrete pouring process.

[0040] Four groups of laser positioning modules 9 are set on the outside of each group of semicircular templates 101. The laser positioning module 9 consists of a laser emitter, a light spot receiver and a data processing terminal. A magnetic adsorption plate 10 is fixed to the outside of the template structure 1. The magnetic adsorption plate 10 uses a strong neodymium iron boron magnet. The laser emitter of the laser positioning module 9 is magnetically adsorbed on the magnetic adsorption plate 10 and can emit vertical and horizontal reference laser beams. The light spot receiver can be fixed on the adjacent template structure 1 or installed on the ground reference point. It has a built-in CCD sensor with a resolution of 0.1mm and can accurately detect the light spot offset. The data processing terminal can analyze the light spot offset in real time and generate calibration instructions. It has a display screen and is wirelessly connected to mobile devices, which makes it convenient for construction personnel to obtain template installation deviation information in time and make adjustments.

[0041] The hoisting module 8 includes a welding plate 801 and a lifting lug 802. The welding plate 801 is made of 10mm thick Q235B steel plate and is welded to the outside of the template structure 1. The welding area is not less than 100cm 2 To ensure the welding strength, the lifting lug 802 is welded on the outside of the welding plate 801. The lifting lug 802 is made of No. 20 steel and is forged and machined. Its load capacity is not less than 5 tons and it plays a role in lifting the template structure 1.

[0042] A construction method for a stainless steel ribbed formwork structure for a plain concrete cylinder

[0043] Column reinforcement binding: At the construction site, column reinforcement binding is carried out according to the design requirements. Galvanized wire is used to bind the clear column reinforcement. Each intersection is wrapped with at least two circles to ensure that the reinforcement is firmly connected. The buckle and the tail end are facing the inside of the component cross section. The wire does not exceed 1.5 times the diameter of the wire on the outside of the stirrup to avoid affecting the concrete pouring and surface quality. A positioning stirrup is set at the top, middle and bottom of the column. The vibrator positioning hoop is made of φ6 steel bar and connected to the top stirrup. The position and number are determined according to calculation to ensure the stability of the steel skeleton and the operating space of the vibrator.

[0044] See also Figure 7 and Figure 8 , Installation of stainless steel formwork structure 1: First, apply the release agent. Use a long-handled brush tool to soak the applicator head and apply it twice on the inner surface of the formwork structure 1. Apply it in an arc shape without leaving any blank spaces to ensure that the release agent evenly covers the formwork surface. Then use a new tool to soak it thoroughly, wring it out and shake it loose, then gently apply it again to ensure that the release agent is evenly distributed. Dry it for at least 30 minutes after application to allow the release agent to fully dry and form an effective isolation layer;

[0045] After the release agent in the template structure 1 has dried, the elastic sealing strip 4 is applied to the joints. The adhesive part is cleaned and dust and debris are removed from the surface. The EPDM rubber sealing strip is applied along the edge with a ruler to ensure a firm bond and prevent leakage.

[0046] When assembling the stainless steel formwork structure 1, place a semicircular formwork 101 flat, install the curved formwork with an exposed seam at the bottom of the beam, and use a lifting machine to lift another semicircular formwork 101 at four points for splicing. First, install the positioning pins, and add a positioning pin every two sets of connection holes to quickly align the semicircular formwork. After checking the flatness of the joints and the straightness of the sealing strips, install the connecting bolts. After completion, remove the positioning pins and install the remaining bolts to ensure that the formwork is tightly spliced. Slowly attach the sealing strip at the bottom of the formwork structure 1 to avoid protruding from the inner surface to prevent affecting the flatness of the concrete surface. Use the laser positioning module 9 to fix the outside of the formwork structure 1 and correct the verticality. Use the laser transmitter to emit a laser beam, the spot receiver receives the spot, and the data processing terminal analyzes the spot offset and generates a calibration instruction. The construction personnel adjust the formwork position according to the instruction to ensure the accuracy of the formwork installation.

[0047] Strictly control the quality of concrete, ensure that the expansion of concrete is 550±50mm, the slump is 200±20mm, the mold temperature is lower than 30℃, avoid pouring during high temperature periods, prevent the evaporation of concrete moisture too quickly and affect the pouring quality, the height of each layer is about 50cm, and the concrete is laid and vibrated layer by layer. Set the pouring string pipe deep into the column, and the bottom of the string pipe is no more than 0.5 meters away from the bottom of the column to ensure uniform distribution of concrete. Before pouring, clean the garbage in the formwork structure 1 and drain the water. Chisel the construction joint at the bottom of the column to remove the floating slurry and expose the stones. Use mortar of the same grade to connect the mortar and control the paving thickness to ensure good bonding of the concrete. Insert the vibrating rod quickly and withdraw it slowly from the preset vibration positioning ring, vibrate layer by layer to avoid repeated vibration and missed vibration, and ensure the density of the concrete.

[0048] 36-48 hours after pouring concrete for the column, remove the formwork, use a hook plate to separate the formwork structure 1 from the concrete surface, and lift the single-sided semicircular formwork 101 from the work point at two points. During the operation, do not touch the surface of the concrete column with sharp objects to prevent damage to the concrete. Spray the curing liquid immediately after demoulding to ensure that the moisture on the concrete surface does not lose and promote the growth of concrete strength. The column surface is not wrapped temporarily. Before pouring the beam and slab structure concrete, wrap the column surface with geotextile to prevent slurry from spilling and contaminating the concrete column. Spray the protective liquid in a timely manner. Before dismantling the floor racks, use wooden boards to protect the entire section of the clear water column above 1.8 meters above the bottom of the column to prevent the column from being damaged by collision.

[0049] See also Figure 9 , about the application of laser positioning module 9

[0050] Installation configuration: 4 sets of laser transmitters are symmetrically installed on the top and middle of the template structure 1 to be installed. The ground reference point is set to receive the target with an accuracy of ±0.5mm. The target center coincides with the axis of the designed column. The calibration system is linked with the BIM model to automatically load the template design coordinate parameters.

[0051] Calibration process:

[0052] Step 1: After hoisting the first section of template structure 1, start the laser transmitter and the receiver captures the spot position. Figure 5 ;

[0053] Step 2: The data processing terminal displays real-time deviations such as +1.5mm on the X axis and -0.8mm on the Y axis to guide the adjustment of the template position;

[0054] Step 3: After locking the formwork structure 1, the system continuously monitors the deviation caused by vibration or pouring, and alarms when the verticality exceeds the limit value > 2mm / m;

[0055] Step 4: When each section of the template structure 1 is spliced, the alignment error of the seams is verified to be ≤0.3mm by laser intersection.

[0056] Effect verification: After using laser calibration, the verticality qualification rate of the columns increased from 92% using the traditional method to 99.6%. The installation time of a single section of formwork was shortened by 40%, from 20 minutes to 12 minutes.

[0057] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A stainless steel ribbed formwork structure for a plain concrete cylinder, comprising a formwork structure (1), characterized in that: The template structure (1) is composed of two groups of semicircular templates (101), and the two sides of the two groups of semicircular templates (101) are fastened and connected by multiple groups of connecting bolts (3); Elastic sealing strips (4) are provided on both sides between the two groups of semicircular templates (101), and multiple groups of connecting bolts (3) pass through the elastic sealing strips (4). The elastic sealing strips (4) play a sealing role at the template joints. A sealing ring (7) is provided at the bottom of the template structure (1), and the sealing ring (7) plays a sealing role between the template structure (1) and the ground platform. Four groups of laser positioning modules (9) are provided on the outside of each group of semicircular templates (101), and the laser positioning modules (9) play a role in positioning the template structure (1).

2. The stainless steel ribbed formwork structure for a plain concrete cylinder according to claim 1, characterized in that: Both sides of the two groups of semicircular templates (101) are provided with multiple groups of connection holes (2) that match the connection bolts (3), and the connection holes (2) are made of threaded holes with positioning pins, so as to achieve the effect of rapid alignment and fixation of the two groups of semicircular templates (101).

3. The stainless steel ribbed formwork structure for a plain concrete cylinder according to claim 1, characterized in that: Multiple groups of vertical ribs (5) are evenly fixed in an annular manner on the outer side of the template structure (1), and multiple groups of transverse ribs (6) are fixed on the outer side of the template structure (1).

4. The stainless steel ribbed formwork structure for a plain concrete cylinder according to claim 3, characterized in that: The vertical ribs (5) have a rectangular cross section and are made of a 6mm thick long steel plate. The transverse ribs (6) have a ring cross section and are made of an 8mm thick steel ring plate, thereby improving the overall rigidity of the template structure (1).

5. The stainless steel ribbed formwork structure for a plain concrete cylinder according to claim 1, characterized in that: The laser positioning module (9) is composed of a laser emitter, a light spot receiver, and a data processing terminal. A magnetic adsorption plate (10) is fixed on the outside of the template structure (1), and the laser emitter of the laser positioning module (9) is magnetically adsorbed on the magnetic adsorption plate (10). The laser emitter can emit vertical and horizontal reference laser beams.

6. The stainless steel ribbed formwork structure for a plain concrete cylinder according to claim 5, characterized in that: The light spot receiver can be fixed on an adjacent template structure (1) or installed at a ground reference point. It has a built-in CCD sensor with a resolution of 0.1 mm. The data processing terminal can analyze the light spot offset in real time and generate calibration instructions. It has a display screen and is wirelessly connected to a mobile device.

7. The stainless steel ribbed formwork structure for a plain concrete cylinder according to claim 1, characterized in that: A hoisting module (8) is welded to the outside of the template structure (1), and the hoisting module (8) comprises a welding plate (801) and a lifting lug (802), the welding plate (801) is welded to the outside of the template structure (1), and the lifting lug (802) is welded to the outside of the welding plate (801), wherein the hoisting module (8) plays a role in hoisting the template structure (1).

8. A construction method for a cylindrical stainless steel ribbed formwork structure for exposed concrete, characterized in that The construction operation using the stainless steel ribbed formwork structure for the exposed concrete cylinder described in any one of claims 1 to 7 comprises the following steps: S1: Column reinforcement binding: Use galvanized wire to bind the clear water column reinforcement, with at least two wraps at each intersection, with the buckle and tail facing the inside of the component cross section. The wire should not exceed 1.5 times the diameter of the wire outside the stirrup. A positioning stirrup is installed at the top, middle, and bottom of the column. A vibrator positioning hoop is installed at the top of the column (made of φ6 steel bars and connected to the top stirrup. The position and number are determined by calculation); S2: Stainless steel formwork structure installation Apply release agent: Soak the applicator with a long-handled brush tool, apply it twice on the inner surface of the template structure, apply it in an arc shape without leaving any blank spaces, then soak a new tool thoroughly, wring it out and shake it, then apply it lightly again to ensure even coverage. Let it dry for at least 30 minutes after application; Attach elastic sealing strips at the joints: After the release agent in the template structure has dried, clean the pasting area and attach the EPDM rubber sealing strips along the edge with a ruler to ensure adhesion; Stainless steel formwork structure assembly: Lay a semicircular formwork flat, install the curved formwork with exposed seams at the bottom of the beam, and use a lifting machine to lift the other semicircular formwork at four points for splicing. First, install the locating pins, and add a locating pin for every two sets of connection holes. Check the flatness of the joints and the straightness of the sealing strips before installing the connecting bolts. After completion, remove the locating pins and install the remaining bolts. Slowly attach the sealing strip at the bottom of the formwork structure to avoid protrusion from the inner surface. Use the laser positioning module to fix the outer side of the formwork structure and correct the verticality. S3: Concrete pouring: Control the concrete expansion within 550±50mm and the slump within 200±20mm. The mold temperature should be below 30℃. Avoid pouring during high temperature periods. The height of each layer should be about 50cm. The concrete should be laid and vibrated layer by layer. The pouring string pipe should be set deep into the column, and the bottom of the string pipe should not exceed 0.5 meters from the bottom of the column. Before pouring, the garbage in the formwork structure should be cleaned and the water should be drained. The construction joint at the bottom of the column should be chiseled to remove the floating slurry and exposed stones. Mortar of the same grade should be used for mortar connection and the paving thickness should be controlled. The inserted vibrating rod should be inserted quickly and removed slowly from the preset vibration positioning ring to vibrate layer by layer to avoid repeated vibration and missed vibration. S4: Formwork removal, maintenance and protection of finished products: Remove the formwork 36-48 hours after pouring concrete for the column, use a hook plate to separate the formwork structure from the concrete surface, and lift the single-sided semicircular formwork from the work point at two points. Do not allow sharp objects to touch the surface of the concrete column. Spray the curing liquid immediately after demolding. The column surface is not wrapped for the time being. Before pouring the beam and slab structure concrete, wrap the column surface with geotextile to avoid spilling the slurry. Spray the protective liquid in time. Before dismantling the floor rack, use wooden boards to wrap the entire cross-section of the 1.8-meter-high part above the bottom of the clear water column for finished product protection.

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