High and special-shaped column shaping wood I-beam ring closure formwork reinforcing system and method

Abstract

The application discloses a high and large special-shaped column shaped wooden I-beam hoop closing formwork reinforcing system and a construction method, and is used for concrete pouring of large-section polygonal independent columns. The system adopts a reinforcing idea of combining shaped prefabrication and assembly with hoop closing and tightening, cooperatively configures vertical H20 wooden I-beam shaped units, hoop double [12 groove steel closing rigid hoops, middle D20 high-strength tensioning screw rods and full-sunny-angle D20 high-strength inclined pull rods, and forms a four-dimensional integrated stress system of "vertical shaped support-hoop overall constraint-middle section stability-corner stress reduction". The shaped units eliminate on-site cutting errors, the hoop closing hoops realize overall constraint of the special-shaped section, the middle tensioning and full-sunny-angle inclined pulling cooperatively reduce the corner stress concentration in space, the problems of corner mold expansion, mold explosion, grout leakage and low assembly efficiency of the special-shaped column are solved, and the construction efficiency and forming quality are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of formwork engineering technology in building construction, and in particular to a circumferential closed formwork reinforcement system and construction method for standardized wooden I-beams for tall irregular columns, which is applicable to the concrete pouring construction of large-section octagonal, polygonal and other irregular independent columns. Background Technology

[0002] As the structural forms of large public buildings, transportation hubs, and industrial plants become increasingly complex, the application of large-section irregular columns (such as octagonal columns and polygonal columns) is becoming more and more widespread. These columns have complex cross-sections, high heights, large lateral pressures on concrete, and numerous corners with significant stress concentrations, placing extremely high demands on the rigidity, precision, and reliability of the formwork reinforcement system.

[0003] Traditional rectangular column formwork reinforcement methods are unsuitable for irregular corners, often resulting in quality problems such as insufficient corner stiffness, bulging, bursting, grout leakage, and cross-sectional distortion. Conventional formwork typically uses ordinary timber and steel pipes for piecemeal bracing reinforcement, which has the following inherent drawbacks: First, timber and steel pipes need to be cut and nailed on-site piece by piece, making assembly cumbersome and relying on worker experience for positioning accuracy, making it difficult to ensure uniform stiffness across the irregular column's formwork. Second, the main joists are mostly arranged in one direction, failing to form a complete closed constraint on the polygonal cross-section, easily causing abrupt stiffness changes at corners, leading to uncontrolled corner deformation. Third, the reinforcement method mainly focuses on central bracing, failing to provide point-to-point reinforcement for all external corners of the irregular column, thus failing to effectively reduce corner stress concentration problems and increasing the risk of bulging and grout leakage. Fourth, the component turnover rate is low, construction efficiency is low, and the forming quality is poor.

[0004] In existing technologies, there are two main approaches to reinforcing irregularly shaped column formwork. One approach uses adjustable formwork components, adjusting the angle and side length on-site by rotating the plate to adapt to different irregularly shaped columns. However, this method relies heavily on on-site adjustment, which involves a large workload, difficulty in ensuring accuracy, and a complex adjustment mechanism with high turnover and maintenance costs, failing to leverage the efficiency advantages of standardized prefabrication. The other approach uses non-through steel component clamps in conjunction with internal steel reinforcement columns for reinforcement. However, this method is only suitable for irregularly shaped columns containing steel reinforcement columns and cannot be applied to purely concrete irregularly shaped columns. Furthermore, it does not form a synergistic force-bearing system of through-connection and corner diagonal bracing, nor does it address the standardized prefabrication and circumferential closed clamping design of the formwork system.

[0005] Therefore, existing technologies still lack a formwork reinforcement system that is suitable for tall, irregularly shaped columns made of pure concrete, requires no on-site adjustment, can be prefabricated in a standardized manner, and can achieve coordinated reinforcement of the corners and the middle. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a standardized circumferential closed formwork reinforcement system and construction method for tall, irregularly shaped wooden I-beams, aiming to solve the problems of insufficient formwork rigidity for large-section polygonal irregularly shaped columns, easy bulging and bursting of the formwork at the corners, large deviations in cross-sectional dimensions, low assembly efficiency, and poor forming quality.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A construction method for a circumferential closed formwork reinforcement system for tall, irregularly shaped wooden I-beams is proposed. This system adopts a systematic reinforcement approach that combines standardized prefabrication and assembly with circumferential closed clamping. Through the coordinated configuration of vertical H20 wooden I-beam standardized units, circumferential double [12 channel steel closed rigid clamps, central D20 high-strength tie rods, and full-angle D20 high-strength diagonal tie rods, a four-dimensional integrated force system is formed, consisting of "vertical standardized support - circumferential overall constraint - central section stability - corner stress reduction".

[0008] It is important to note that the aforementioned technical features of this invention are not simply superimposed, but rather a systematic adaptation to the geometric and stress characteristics of irregularly shaped columns. The H20 I-beam shaping unit addresses the problems of uneven stiffness on each side of the irregularly shaped column and large on-site cutting errors; the circumferential closed double-channel steel addresses the problems of multiple corners in irregularly shaped columns and the inability of the unidirectional main keel to constrain the entire circle; the central tie rod addresses the problem of overall cross-sectional dimensional stability; and the full-angle diagonal tie rod addresses the problems of bulging, bursting, and grout leakage caused by stress concentration at the corners. All four are indispensable. Without the shaping unit, on-site assembly accuracy cannot be guaranteed; without the circumferential closed hoop, corner constraint fails; without the central tie rod, the overall cross-sectional dimensions become uncontrollable; and without the full-angle diagonal tie rod, corner bulging is inevitable. These four elements form a rigid connection node through the circumferential main keel, constituting a spatial overall stress network and producing a synergistic enhancement effect. Its overall anti-bulging capacity is significantly better than the simple superposition of the individual effects of each technical feature.

[0009] The method includes the following steps: S1: Standardized modular assembly The H20 timber beams are processed into standardized units according to the width and height of the irregular column on one side. The ends at the corners are cut according to the actual included angle to complete the assembly of the secondary keel frame. The wooden formwork panels are cut according to the dimensions of the irregular column on one side, laid and fixed on the H20 timber beams, and the panels at the external corners are cut and spliced ​​to form a single-sided standardized formwork unit.

[0010] The standardized prefabrication eliminates on-site cutting errors, ensuring uniform stiffness of the secondary joists on each side of the irregular column, and avoiding positioning deviations and uneven edge stiffness caused by traditional on-site scattered cutting. The H20 timber I-beams, arranged vertically as secondary joists, provide a higher moment of inertia for the cross-section of their web and flanges, resulting in stronger bending stiffness compared to traditional timber, and are also lighter in weight, making them easier to hoist.

[0011] S2: Overall hoisting and positioning The single-sided standardized template units are hoisted and assembled into a complete column formwork, aligned with the positioning line, and then placed in place. Temporary diagonal braces are used to fix the complete column formwork and prevent hoisting misalignment.

[0012] Since the templates on each side have been pre-assembled on the ground, the assembly of the overall column formwork only requires aligning the units on each side with the positioning lines and splicing them together, which greatly reduces the amount of high-altitude work and on-site adjustment work.

[0013] S3: Circumferential Closed Main Keel Installation Install the circumferential double [12 channel steel main keel, with the double channel steel installed back to back to form a ring rigid hoop. The vertical spacing is arranged in a gradual manner with denser spacing at the bottom and sparser spacing at the top, and the entire ring is tightened around the irregular column section.

[0014] Unlike the conventional approach of using a single-direction main joist arrangement to meet the lateral tension requirements of rectangular columns, irregularly shaped columns, due to their numerous sides and corners, cannot effectively transfer force at the corners with a single-direction main joist arrangement, leading to abrupt changes in corner stiffness. This invention employs a double-channel steel back-to-back circumferential closed arrangement to form a continuous annular rigid hoop, uniformly transmitting the lateral pressure of the concrete along the entire cross-section, achieving overall constraint on the entire cross-section of the irregularly shaped column. The vertical spacing is arranged in a gradually changing pattern, denser at the bottom and sparser at the top, adapting to the distribution law of the lateral pressure of the concrete along the height: the peak value of the lateral pressure of the concrete at the bottom is large, so the denser arrangement is used to resist the peak value; the lateral pressure decreases at the top, so the sparser arrangement is used to optimize material usage. Lifting rings are provided at the top of the assembled formwork to facilitate overall hoisting.

[0015] S4: Central tie beam and full-angle diagonal bracing for reinforcement D20 high-strength tie rods are installed in the middle of each side of the irregular column, penetrating the templates on both sides and connecting to the circumferential main keel. D20 high-strength external corner tie rods are installed at all external corners, in conjunction with external corner tie rod seats and pad nuts. The tie rods and the middle tie rods form a connection node through the same circumferential main keel.

[0016] The central tie rod converts the lateral pressure of the central concrete into the internal force of the circumferential main keel, which is evenly distributed to each side of the irregular column through the annular rigid hoop, stabilizing the overall dimensions of the cross-section. The full-angle diagonal tie rod is installed at all the external corners of the irregular column, forming a spatial tie node with the central tie rod through the same circumferential main keel. This allows the diagonal constraint force at the corner and the horizontal tie force at the center to work together, directly reducing stress concentration at the corner and preventing corner bulging, bursting, and grout leakage.

[0017] The spatial angle and length of the corner tie rod are determined by corner force calculation based on the corner angle and cross-sectional dimensions of the octagonal column. This ensures that the axial force of the tie rod generates a normal component perpendicular to the bisecting plane of the corner, resisting the corner expansion displacement point-to-point. This design achieves a technical upgrade in corner reinforcement from "indirect constraint" to "point-to-point direct resistance".

[0018] S5: Alignment, tightening and pouring Correct the column's verticality, side length, diagonal dimensions, and corner angles to ensure the spatial positioning accuracy of the standardized formwork unit after circumferential closure and tightening. Tighten all bolts and tie rod nuts one by one to ensure uniform force distribution. Check the cross-sectional dimensions, axis, verticality, elevation, bolt tightening force, and corner seals. After acceptance, pour concrete.

[0019] As a further explanation of the above technical solution of the present invention: The vertical H20 I-beam shaping unit, the circumferential double [12 channel steel closed rigid hoop, the central D20 high-strength tie rod, and the full-angle D20 high-strength diagonal tie rod form a rigid connection node through the circumferential main keel, constituting a spatial overall force network. The synergistic configuration of these four components produces a combined reinforcement effect: the shaping unit ensures assembly accuracy and uniform edge stiffness; the circumferential closed hoop ensures corner restraint for irregular cross-sections; the central tie rod ensures overall dimensional stability of the cross-section; and the full-angle diagonal tie rod ensures reduction of corner stress concentration. All four are indispensable, together forming a systematic solution that replaces the traditional method of scattered cutting and unidirectional main keel reinforcement.

[0020] The present invention produces the following beneficial effects: This invention fundamentally solves the systemic problem of reinforcing irregular column formwork by combining standardized prefabrication and circumferential closed clamping. First, by eliminating on-site cutting errors through standardized prefabrication units, the problems of uneven stiffness on each side of irregular columns and inaccurate assembly positioning are solved, realizing a methodological upgrade from scattered on-site cutting to factory-standardized prefabrication. Second, by using circumferentially closed double-channel steel ring rigid hoops, continuous overall constraint is achieved on the entire cross-section of polygonal irregular columns, overcoming the inherent defect of interrupted force transmission at corners by unidirectional main keels. Third, through the spatial synergy of central tension and full-angle diagonal tension, a three-dimensional reinforcement network of complementary "central surface constraint and corner point constraint" is formed, directly reducing stress concentration at corners and preventing bulging, bursting, and grout leakage. Finally, the above four elements form a spatial overall force network through the circumferential main keel, producing a synergistic enhancement effect. Its overall anti-bulging capacity is significantly better than the simple superposition of the individual effects of each technical feature, making it suitable for the construction of complex irregular columns with large cross-sections, high lateral pressure, and multiple corners. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the formwork for an independent column, showing the overall layout of the octagonal column formwork, the diagonal bracing at the external corners, the tie rods, the circumferential main keel, and the overall configuration of the lifting rings.

[0022] Figure 2This is a schematic diagram of the template for a single side of an independent column, showing the H20 wooden beam secondary joists, panels, wooden beam connecting claws, and corner cutting structures of one side formwork of an octagonal column.

[0023] Figure 3 The diagram shows the plan view of the template on one side of the independent column, illustrating the standardized unit unfolding structure of the template on the other side of the octagonal column.

[0024] Figure 4 This is a schematic diagram of the single-sided facade formwork for an independent column, showing the vertical arrangement of the secondary joists of the H20 I-beam, the beam connectors, the lifting rings, and the vertical spacing of the circumferential main joists.

[0025] Figure 5 This is a schematic diagram of the end formwork for a single-sided facade of an independent column, showing the details of the formwork end structure and lifting ring installation.

[0026] Figure 6 This is a schematic diagram of the formwork connection on one side of an independent column, showing the connection structure between adjacent formwork units.

[0027] Figure 7 The diagram shows the connection details of the external corner diagonal bracing reinforcement node, including the external corner diagonal bracing rod, external corner diagonal bracing seat, pad connecting nut, and the double channel steel of the template back rib and the panel. Detailed Implementation

[0028] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0029] Example 1: Construction of Octagonal Column Formwork Reinforcement under Standard Working Conditions like Figures 1 to 7 As shown, this embodiment is applied to a large-section octagonal independent column with a height of 8m and an equilateral octagonal cross-section.

[0030] Step 1: Technical verification and measurement layout Verify the width of each side, the included angle, the diagonal dimensions, and the total height of the octagonal column. Draw a template matching diagram and prohibit arbitrary cutting on site. Mark the octagonal column axis, outer contour line, control line, elevation control line, and template positioning edge line on the floor slab to ensure that the eight sides and eight corners of the octagon are accurately positioned and without twisting.

[0031] Step 2: H20 timber beam secondary joist shaping and unit assembly The secondary keel uses H20 timber beams arranged vertically, spaced 200-300mm apart. The timber beams are cut to standard dimensions according to the width and height of each octagonal column, completing the frame assembly and ensuring consistent rigidity on each side. The ends of the timber beams at the octagonal corners are cut according to the actual included angle to ensure straight, seamless joints.

[0032] The standardized processing allows each side of the secondary keel to be precisely cut and pre-assembled in the factory, with only the connection and fixing between units required on site. This eliminates the length and angle errors caused by traditional on-site cutting of timber piece by piece, ensuring that the template stiffness of the eight sides of the octagonal column is uniform and consistent, and avoiding cross-sectional distortion caused by differences in edge stiffness.

[0033] Step 3: Laying 18mm wood panels Cut 18mm thick wooden templates according to the dimensions of one side of an octagon as the panel, and lay and fix them on the H20 I-beam. The panel joints are tight and flat, and the panels are cut and spliced ​​at the external corners of the octagon to avoid misalignment and grout leakage.

[0034] Step 4: Circumferential installation of double [12 channel steel main keel] The main keel uses double [12 channel steel, arranged in a closed ring, unlike the unidirectional arrangement of rectangular columns. Octagonal columns require a full-circle hoist. The vertical spacing is arranged at 300mm, 500mm, 1000mm, and 1000mm, with the double channel steel installed back-to-back to form a ring-shaped rigid hoist, constraining the expansion of irregular cross-sections. Lifting rings are installed on the top of the assembled formwork for easy hoisting.

[0035] The circumferential closed arrangement forms a continuous ring-shaped force transmission path. After the concrete lateral pressure is applied to the formwork panel, it is transmitted to the circumferential main keel through the secondary keel. The main keel integrates the lateral pressure dispersed on each side into circumferential internal force and bears the circumferential tensile force through its own closed section, effectively avoiding the sudden change in stiffness of the unidirectional main keel at the corner due to the interruption of force transmission.

[0036] Step 5: Reinforce the tie rod and octagonal external corners (critical process) ① Column tie rods: D20 high-strength tie rods are installed in the middle of each side of the octagon, penetrating the templates on both sides and connecting to the main keel around the circumference to balance the force.

[0037] ②Octagonal external corner diagonal bracing: The octagonal column has a total of 8 external corners. Each external corner is equipped with a D20 high-strength external corner diagonal bracing rod, external corner diagonal bracing seat and pad connecting nut, which is consistent with the construction of the external corner of the independent column, to prevent the irregular corner from bulging, bursting and leakage of grout.

[0038] A complete load-bearing system is formed: vertical H20 secondary keel + circumferential double [12 main keel + central bolt tie rod + octagonal full external corner diagonal tie rod. The central tie rod and the full external corner diagonal tie rod form a spatial synergy through the circumferential main keel: the central tie rod provides a horizontal constraint force perpendicular to the template surface, stabilizing the overall dimensions of the cross-section; the external corner diagonal tie rod provides a normal constraint force perpendicular to the external corner bisecting plane, reducing stress concentration at the corner point by point. The two complement each other in space and converge on the circumferential main keel to form a three-dimensional reinforcement network of "central surface constraint + corner point constraint".

[0039] Step 6: Overall alignment and fixing of the template The four sets of single-sided formwork were hoisted and assembled into an integral octagonal column formwork, which was then aligned with the positioning lines. The verticality of the column, the length of each side of the octagon, the diagonal dimensions, the corner angles, and the overall roundness were corrected, and temporary diagonal bracing was used for fixation to prevent misalignment.

[0040] Step 7: Thorough Tightening and Acceptance Tighten each D20 tie rod and corner brace nut individually to ensure even force distribution. Check the cross-sectional dimensions, axis, verticality, elevation, tie rod tightening force, and corner seals. Only proceed to the next step of construction after passing the inspection.

[0041] Example 2: Comparative Application with Traditional Adjustable Template Components Taking the construction of an octagonal column in a transportation hub as an example, the column has an equilateral octagonal cross-section with a side length of 1.2m and a height of 8.5m. If the existing adjustable formwork components are used, the angle of each formwork piece needs to be adjusted on-site, resulting in large cumulative errors from adjusting the eight sides and eight corners. Furthermore, the adjustment mechanism is complex, and the installation cycle for a single column formwork is approximately 5 days. If traditional timber and steel pipe reinforcement is used, the on-site cutting workload is large, the unidirectional arrangement of the main keel cannot constrain the octagonal corners, the risk of corner bulging is high, and grout leakage and misalignment frequently occur at the corners after molding.

[0042] After adopting the standardized circumferential closed formwork reinforcement system for wooden I-beams described in this invention, the H20 wooden I-beams are pre-cut in the factory with a width of 1.2m on each side and a height of 8.5m, and only unit assembly is carried out on site; the double [12 channel steel circumferential closed hoop is tightened around the entire circle, and all 8 external corners are equipped with diagonal tie rods; the overall column formwork is pre-assembled on the ground and then hoisted into place in one go, shortening the installation cycle of a single column formwork to 2 days, and all 8 external corners of the octagonal column remain sealed under the action of the peak lateral pressure of concrete, with zero grout leakage at the corners and the cross-sectional dimension deviation controlled within 3mm.

[0043] Compared with the prior art, the present invention has the following specific beneficial effects: (1) Construction efficiency is significantly improved. By combining standardized wooden I-beam units with circumferential closed channel steel hoops, the formwork system can be pre-assembled on the ground before hoisting. After hoisting, it only needs to be aligned once to be in place. The installation cycle of a single column formwork is shortened from 5 days in the traditional method to 2 days, and the construction efficiency is improved by more than 40%.

[0044] (2) Enhanced constraint capacity of irregular cross-section. The use of double [12 channel steel in a closed circumferential arrangement to form a ring rigid hoop, which is different from the unidirectional main keel reinforcement method of rectangular columns, realizes continuous constraint on the entire cross-section of polygonal irregular columns, and effectively solves the problem of stiffness abrupt change and constraint failure at the corner.

[0045] (3) Breakthrough improvement in corner forming quality. Through the spatial coordination of the central tie and the full external corner diagonal tie, all external corners of the octagonal column are kept sealed under the peak lateral pressure of concrete, the corner leakage rate is reduced to zero, and the cross-sectional dimension deviation is controlled within 3mm. This is a technical effect that cannot be achieved by a single central tie or a single corner diagonal tie.

[0046] (4) Overall stress performance is enhanced synergistically. Through the four-dimensional integrated synergistic configuration of vertical secondary keel, circumferential main keel, central tie rod and corner diagonal tie rod, a combined enhancement effect is generated. The overall anti-bulging capacity is significantly better than the simple superposition of the individual effects of each technical feature. It is suitable for the construction of complex irregular columns with large cross-section, high lateral pressure and multiple corners.

[0047] (5) Significant economic and green construction benefits. The components of this invention can be reused repeatedly, with high material utilization. Compared with traditional support methods, it reduces construction costs and reduces construction waste generated by on-site timber cutting, which meets the requirements of green construction.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A construction method for a standardized circumferential closed formwork reinforcement system for tall, irregularly shaped columns, used for concrete pouring of large-section polygonal independent columns, characterized in that... A systematic reinforcement approach combining standardized prefabrication and circumferential closed clamping is adopted. Through the coordinated configuration of vertical H20 I-beam standardized units, circumferential double [12 channel steel closed rigid clamps, central D20 high-strength tie rods, and all-angle D20 high-strength diagonal tie rods, a four-dimensional integrated force system is formed, consisting of "vertical standardized support - circumferential overall constraint - central section stability - corner stress reduction." The method includes the following steps: S1: Process the H20 wooden beam into a standardized unit according to the width and height of the irregular column on one side. Cut the end of the corner according to the actual included angle to complete the assembly of the secondary keel frame. Cut the wooden formwork panel according to the size of the irregular column on one side, lay and fix it on the H20 wooden beam. Cut the panel at the external corner and splice it to form a single-sided standardized formwork unit. S2: Hoist and assemble the single-sided standardized template units into an integral column formwork, and align them with the positioning line; S3: Install circumferential double [12 channel steel main keel, double channel steel back to back to form a ring rigid hoop, vertical spacing is arranged in a gradual manner of dense at the bottom and sparse at the top, the whole ring is tightened to tighten the irregular column section; S4: D20 high-strength tie rods are installed in the middle of each side of the irregular column, penetrating the templates on both sides and connecting to the circumferential main keel; D20 high-strength external corner diagonal tie rods are installed at all external corners, and the diagonal tie rods and the middle tie rods form a tie node through the same circumferential main keel to jointly resist the stress concentration at the corner and the lateral pressure at the middle. S5: Correct the verticality of the column, the length of each side, the diagonal dimensions and the corner angle, tighten all bolts and tie rods, and pour concrete after acceptance.

2. A circumferential closed formwork reinforcement system for tall, irregularly shaped wooden I-beam columns, characterized in that, include: Wooden formwork panels are cut to the dimensions of one side of the irregular column, and the panels at the external corners are cut and spliced ​​together. The H20 wooden beam secondary keel is processed into a standardized unit according to the single-sided width and height of the irregular column. The ends at the corners are cut according to the actual included angle. The wooden template panel is laid and fixed on the H20 wooden beam to form a single-sided standardized template unit. Circumferential double [12 channel steel main keel, double channel steel back to back to form a ring rigid hoop, used to tighten the irregular column section around the whole circle; D20 high-strength tie rods are installed in the middle of each side of the irregular column, penetrating the templates on both sides and connecting the circumferential main keel; D20 high-strength external corner tie rods are installed at all external corners and form a tie node with the central tie rod through the same circumferential main keel.

3. The construction method or reinforcement system according to claim 1 or 2, characterized in that, The H20 wooden I-beam secondary joists are prefabricated in the factory according to the width and height of the irregular column on one side. The wooden formwork panel is made of 18mm thick fair-faced wood formwork, which is cut according to the dimensions of the irregular column on one side, and the corners are cut and spliced ​​before being laid and fixed on the H20 wooden I-beam. The prefabrication eliminates the on-site cutting error and ensures that the stiffness of the secondary joists on each side of the irregular column is uniform, avoiding the positioning deviation and uneven edge stiffness caused by traditional on-site scattered cutting.

4. The construction method or reinforcement system according to claim 1 or 2, characterized in that, The circumferential double [12 channel steel main keel is installed back-to-back to form a ring-shaped rigid hoop. The vertical spacing is arranged in a gradual manner with denser spacing at the bottom and sparser spacing at the top, which is adapted to the distribution law of concrete lateral pressure along the height. The bottom is denser to resist the peak lateral pressure, and the top is sparser to optimize the amount of material used. The entire hoop tightens the irregular column section. A lifting ring is provided at the top of the whole assembly template to facilitate the overall hoisting.

5. The construction method or reinforcement system according to claim 1 or 2, characterized in that, The D20 high-strength tie rods are installed in the middle of each side of the irregular column, penetrate the templates on both sides and tie the circumferential main keel, converting the lateral pressure of the central concrete into the internal force of the circumferential main keel, which is evenly distributed to each side of the irregular column through the annular rigid hoop, stabilizing the overall dimensions of the cross section.

6. The construction method or reinforcement system according to claim 1 or 2, characterized in that, The D20 high-strength external corner tie rod is installed at all external corners of the irregular column. Together with the external corner tie seat and the pad connecting nut, it forms a spatial tie node with the central tie rod through the same circumferential main keel. This allows the diagonal constraint force at the corner and the horizontal tie force at the center to work together to directly reduce stress concentration at the corner and prevent corner bulging, mold bursting, and grout leakage.

7. The construction method or reinforcement system according to claim 1 or 2, characterized in that, The spatial angle and length of the external corner tie rod are determined by corner force calculation based on the external corner angle and cross-sectional dimensions of the octagonal column, so that the axial force of the tie rod generates a normal component force perpendicular to the bisecting plane of the external corner, resisting the corner expansion displacement point by point.

8. The construction method of the circumferential closed formwork reinforcement system for tall, irregularly shaped columns and I-beams according to claim 1, characterized in that, In step S2, temporary diagonal bracing is used to fix the overall column formwork to prevent hoisting deviation. In step S5, the verticality of the column, the length of each side, the diagonal dimensions and the corner angle are corrected to ensure the spatial positioning accuracy of the standardized formwork unit after circumferential closure and tightening. All bolts and diagonal tie rod nuts are tightened one by one to ensure uniform force. Pouring can only be carried out after acceptance.

9. The construction method or reinforcement system according to claim 1 or 2, characterized in that, The vertical H20 I-beam shaping unit, the circumferential double [12 channel steel closed rigid hoop, the central D20 high-strength tie rod, and the full-angle D20 high-strength diagonal tie rod form a rigid connection node through the circumferential main keel, constituting a spatial overall force network; the four components work together to produce a combined reinforcement effect, wherein the shaping unit ensures assembly accuracy and uniform edge stiffness, the circumferential closed hoop ensures corner constraint of irregular cross-section, the central tie rod ensures overall cross-sectional dimension stability, and the full-angle diagonal tie rod ensures reduction of corner stress concentration.

10. The construction method or reinforcement system according to claim 4, characterized in that, The vertical spacing of the circumferential double [12 channel steel main keel is specifically 300mm, 500mm, 1000mm, and 1000mm.

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