A construction technology for formwork support of an assembled structure of UHPC formwork square columns

Abstract

The present application relates to a construction technology for formwork support of a UHPC formwork square column assembly structure, belonging to the field of formwork support for square columns, and includes the following steps: Install the UHPC formwork on the floor surface and leave a space at the column foot of the UHPC formwork; Bind and fix the vertical steel bars of the UHPC formwork to the lower-layer steel bars and make lightning protection connections, and use a wooden formwork to seal and fix the space left at the column foot of the UHPC formwork; Divide the keel into four sections, two transverse keels and two longitudinal keels, and fix and adjust the lengths of the transverse keel and the longitudinal keel through the bolt hole positions to meet the size requirements of different column cross-sections; Or, weld and fix one transverse keel and one longitudinal keel, and then fix the keel end positions of the two diagonal fixing frames with fixing bolts passing through the fixing screw holes. According to the different cross-sectional sizes of the UHPC formwork, the present application fixes and adjusts the lengths of the transverse keel and the longitudinal keel through the bolt hole positions to meet the size requirements of different column cross-sections.

Description

Technical Field

[0001] This application relates to the field of formwork support for square columns of formwork shells, and in particular to a construction technology for formwork support of an assembled structure of UHPC formwork square columns. Background Technique

[0002] The UHPC formwork square column is a precast member made of ultra-high performance concrete (UHPC) material, which has the characteristics of high integration, structural safety, labor saving, standard dimensions, excellent quality, cost saving, easy inspection and easy verification.

[0003] In the development of the modern construction industry, the promotion and popularization of prefabricated buildings are increasing, including fully prefabricated and semi-prefabricated forms, and there are many ways of installation and fixation. Considering that wooden formwork is used at the local column foot position of the UHPC formwork square column in this project, and there are many types of cross-sectional dimensions of the square column, traditional wooden formwork for fixing wall columns mostly uses wooden battens and steel pipes for fixation.

[0004] In view of the above related technologies, traditional wooden formwork for fixing wall columns mostly uses wooden battens and steel pipes for fixation, which is difficult to adapt to wall columns of various sizes. Summary of the Invention

[0005] In order to fix wall columns of various sizes, this application provides a construction technology for formwork support of an assembled structure of UHPC formwork square columns.

[0006] This application provides a construction technology for formwork support of an assembled structure of UHPC formwork square columns, and adopts the following technical solutions:

[0007] A construction technology for formwork support of an assembled structure of UHPC formwork square columns includes the following steps:

[0008] S1: Install the UHPC formwork on the floor to act as a formwork, and leave a space at the column foot of the UHPC formwork;

[0009] S2: Bind and fix the vertical steel bars of the UHPC formwork to the lower-layer steel bars and make lightning protection connections, and use wooden formwork to seal and fix the space left at the column foot of the UHPC formwork;

[0010] S3: According to the different cross-sectional dimensions of the UHPC formwork, divide the keels into four sections, two transverse keels and two longitudinal keels, and adjust the lengths of the transverse keels and longitudinal keels by fixing the positions of the bolt holes to meet the size requirements of different column cross-sections; or, weld and fix one transverse keel and one longitudinal keel to form two diagonal fixing frames, and then fix the end positions of the keels of the two diagonal fixing frames by passing fixing bolts through the fixing screw holes.

[0011] By adopting the above technical solution, since the vertical steel bars of the formwork column need to be tied and fixed to the steel bars of the lower column and connected for lightning protection, a void is left at 500 mm from the bottom of the UHPC formwork column. Four plywood boards are used to surround the void at the bottom of the UHPC formwork column and are bonded with glue, so as to seal and fix the wooden formwork, which is convenient for subsequent pouring of concrete into the UHPC formwork. According to the different cross-sectional dimensions of the UHPC formwork, the lengths of the transverse keel and the longitudinal keel are fixed and adjusted through the bolt hole positions to meet the size requirements of different column cross-sections.

[0012] Optionally, in step S3, the transverse keel includes a transverse sleeve and transverse square tubes inserted through both ends of the transverse sleeve. A plurality of sleeve holes are formed in the transverse sleeve, and a plurality of bolt holes are formed in the transverse square tubes. When the length of the transverse keel needs to be adjusted, the lengths of the two transverse square tubes extending out of the transverse sleeve are adjusted, and then the transverse bolts are passed through the aligned sleeve holes and bolt holes, and the transverse nuts are connected to the transverse bolts.

[0013] By adopting the above technical solution, the lengths of the two transverse square tubes extending out of the transverse sleeve are adjusted, and then the transverse bolts are passed through the aligned sleeve holes and bolt holes, and the transverse nuts are connected to the transverse bolts, so that the length of the transverse keel can be adjusted.

[0014] Optionally, in step S3, both the transverse keel and the longitudinal keel are arranged in multiple rows in the vertical direction. Connecting screws are inserted between the multiple rows of transverse keels, and a plurality of connecting nuts are threadedly connected to the connecting screws so that the connecting nuts are in contact with the transverse keels.

[0015] By adopting the above technical solution, the connection strength between the multiple rows of transverse keels can be improved to enhance the overall stability of the plywood, which is convenient for subsequent pouring of concrete.

[0016] Optionally, in step S2, when using the wooden formwork for sealing and fixing, first determine the size of the void at the bottom of the UHPC formwork column to determine the size of the plywood to be used. Surface treatment is carried out on the bonding surfaces at the left and right ends of the plywood, glue is applied to the bonding surfaces at the left and right ends of each plywood board. The opposite ends of the plywood are both set at an oblique angle, and then the four plywood boards are surrounded around the void at the bottom of the UHPC formwork column so that the end faces of adjacent plywood boards are bonded to each other.

[0017] By adopting the above technical solution, four plywood boards are used to surround the void at the bottom of the UHPC formwork column and are bonded with glue, so as to seal and fix the wooden formwork, which is convenient for subsequent pouring of concrete into the UHPC formwork.

[0018] Optionally, in step S2, after applying glue to the bonding surfaces at the left and right ends of each plywood board, a protruding block is installed at the upper end of the plywood board, an installation groove is formed between the two protruding blocks, and a T-shaped sealing strip is installed in the installation groove, with the vertical portion of the T-shaped sealing strip located in the installation groove. When the four plywood boards are surrounded around the void at the bottom of the UHPC formwork column, the T-shaped sealing strip can seal the top of the plywood board and the lower end of the UHPC formwork.

[0019] By adopting the above technical solution, the T-shaped sealing strip can seal the top of the plywood board and the lower end of the UHPC formwork to adapt to the tiny gap between the top of the plywood board and the lower end of the UHPC formwork.

[0020] Optionally, in step S2, a T-shaped cavity is formed inside the T-shaped sealing strip, and a plurality of pinholes communicating with the T-shaped cavity are opened at the top of the T-shaped sealing strip. After installing the vertical portion of the T-shaped sealing strip in the installation groove, glue is injected into the T-shaped cavity inside the T-shaped sealing strip through the pinholes.

[0021] By adopting the above technical solution, when pouring concrete into the UHPC formwork, since the cement in the concrete will undergo a hydration reaction after being mixed with water, which is an exothermic process, the heat generated by the concrete can be conducted to the T-shaped sealing strip through the protruding block. The T-shaped sealing strip expands slightly when heated, reducing the volume of the T-shaped cavity, so that the glue in the T-shaped cavity can be discharged along the pinholes to the position between the T-shaped sealing strip and the lower end of the UHPC formwork.

[0022] Optionally, in step S2, the ends of the two protruding blocks close to each other are both set to be serrated, and the two ends of the vertical portion of the T-shaped sealing strip are serrated to match the protruding blocks.

[0023] By adopting the above technical solution, the contact area between the protruding block and the T-shaped sealing strip can be increased, making it easier for the protruding block to conduct heat into the T-shaped sealing strip.

[0024] Optionally, in step S2, a plurality of horizontal exhaust grooves are opened at the top of the T-shaped sealing strip. The positions of the horizontal exhaust grooves correspond to those of the pinholes, and both ends of the exhaust grooves penetrate through both ends of the T-shaped sealing strip. A plurality of vertical exhaust grooves communicating with the horizontal exhaust grooves are opened at the top of the T-shaped sealing strip, and the vertical exhaust grooves penetrate through the periphery of the horizontal portion of the T-shaped sealing strip.

[0025] By adopting the above technical solution, after the glue is discharged from the pinholes, it can push the air at the horizontal exhaust grooves and the vertical exhaust grooves, facilitating the smooth discharge of the glue.

[0026] Optionally, in step S2, the ends of the protruding block and the two ends of the T-shaped sealing strip are both set to be beveled. When the four plywood boards are surrounded around the void at the bottom of the UHPC formwork column, the ends of adjacent protruding blocks are mutually attached, and the ends of adjacent T-shaped sealing strips are mutually attached.

[0027] By adopting the above technical solution, the ends of two adjacent protruding blocks can be connected, and the ends of two adjacent T-shaped sealing strips can be connected to each other to improve the overall stability.

[0028] Optionally, in step S2, a plurality of exhaust holes are formed in the UHPC formwork.

[0029] By adopting the above technical solution, during the concrete pouring process, the concrete may contain air or other gases. The exhaust holes can provide a channel for these gases to escape before the concrete solidifies, thereby reducing the air bubbles inside the concrete and improving the density and durability of the concrete.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. According to the different cross-sectional dimensions of the UHPC formwork, the lengths of the transverse keel and the longitudinal keel are fixed and adjusted through the bolt hole positions to meet the size requirements of different column cross-sections;

[0032] 2. The T-shaped sealing strip can seal the top of the plywood and the lower end of the UHPC formwork to adapt to the small gap between the top of the plywood and the lower end of the UHPC formwork;

[0033] 3. The heat generated by the concrete can be conducted to the T-shaped sealing strip through the protruding block. The T-shaped sealing strip expands slightly when heated, reducing the volume of the T-shaped cavity, so that the glue in the T-shaped cavity can be discharged along the pinholes to the position between the T-shaped sealing strip and the lower end of the UHPC formwork. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the formwork support construction process of the UHPC formwork square column assembly structure;

[0035] Figure 2 is a top view of the formwork support construction process of the UHPC formwork square column assembly structure;

[0036] Figure 3 is a schematic diagram of the plywood of the formwork support construction process of the UHPC formwork square column assembly structure;

[0037] Figure 4 is a cross-sectional view of the T-shaped sealing strip of the formwork support construction process of the UHPC formwork square column assembly structure;

[0038] Figure 5 is a schematic diagram of the T-shaped sealing strip of the formwork support construction process of the UHPC formwork square column assembly structure.

[0039] Description of reference numerals: 1. UHPC formwork; 11. Vertical steel bars; 12. Vent holes; 2. Plywood; 21. Protruding blocks; 22. Installation grooves; 23. T-shaped sealing strips; 231. Vertical part; 232. Horizontal part; 233. T-shaped cavity; 234. Pin holes; 235. Horizontal exhaust grooves; 236. Longitudinal exhaust grooves; 3. Horizontal keels; 31. Horizontal sleeves; 311. Sleeve holes; 32. Horizontal square tubes; 321. Bolt holes; 33. Horizontal bolts; 34. Horizontal nuts; 4. Longitudinal keels; 5. Connecting screws; 51. Connecting nuts. Detailed implementation manners

[0040] The following further elaborates on this application Figures 1 to 5 in conjunction with the accompanying drawings.

[0041] The embodiment of this application discloses a construction technology for formwork support of a UHPC formwork square column assembly structure. Referring to Figure 1 , the construction technology for formwork support of a UHPC formwork square column assembly structure includes the following steps:

[0042] S1: Referring to Figure 1 and Figure 2 , install the UHPC formwork 1 on the floor to serve as a formwork, and leave a void 500 mm from the column foot of the UHPC formwork 1. Vertical steel bars 11 are installed inside the UHPC formwork 1, and the vertical steel bars 11 are tied to each other.

[0043] S2: Tie and fix the vertical steel bars 11 of the UHPC formwork 1 to the lower-layer steel bars and make lightning protection connections, and use a wooden formwork to seal and fix the void at the column foot of the UHPC formwork 1.

[0044] Referring to Figure 3 and Figure 4 , when using a wooden formwork for sealing and fixing, according to the size of the void at the column foot of the UHPC formwork 1 (500 mm), determine the size of the plywood 2 to be used (450 mm), and perform surface treatment on the bonding surfaces at the left and right ends of the plywood 2 to ensure that the bonding surfaces of the plywood 2 are clean, free of oil stains, dust, or old glue marks. The opposite ends of the plywood 2 are both beveled, and the angle of the bevel is 45 degrees. Apply glue to the bonding surfaces at the left and right ends of each piece of plywood 2, and the glue here is woodworking glue. Then surround the void at the column foot of the UHPC formwork 1 with four pieces of plywood 2, and make the end faces of adjacent two pieces of plywood 2 bond to each other.

[0045] Since the vertical steel bars 11 of the formwork column need to be tied and fixed to the lower-layer column steel bars and make lightning protection connections, a void is left 500 mm from the column foot of the UHPC formwork 1. Four pieces of plywood 2 are surrounded at the void at the column foot of the UHPC formwork 1 and bonded with glue, so as to seal and fix the wooden formwork, facilitating subsequent pouring of concrete into the UHPC formwork 1.

[0046] Preferably, after applying glue to the bonding surfaces at both left and right ends of each plywood board 2, the bonding surface at the upper end of the plywood board 2 is surface-treated to ensure that the bonding surface of the plywood board 2 is clean, free of oil stains, dust or old glue marks. Then, two protruding blocks 21 are bonded to the upper end of the plywood board 2 through epoxy resin. The length direction of the protruding blocks 21 is parallel to the length direction of the upper end of the plywood board 2, so that an installation groove 22 is formed between the two protruding blocks 21, and a T-shaped sealing strip 23 is installed in the installation groove 22, so that the vertical part 231 of the T-shaped sealing strip 23 is clamped in the installation groove 22. When the four plywood boards 2 are arranged around the void at the column foot of the UHPC formwork 1, the T-shaped sealing strip 23 can seal the top of the plywood board 2 and the lower end of the UHPC formwork 1. It should be noted that the T-shaped sealing strip 23 is divided into a vertical part 231 located below and a horizontal part 232 located above.

[0047] Since it is necessary to apply glue to the bonding surface of the plywood board 2, it is necessary to ensure that the bonding surface of the plywood board 2 is clean, free of oil stains, dust or old glue marks, so as to improve the stability of glue application, and thus improve the stability after the subsequent glue hardens. In addition, since the T-shaped sealing strip 23 can seal the top of the plywood board 2 and the lower end of the UHPC formwork 1 to adapt to the small gap between the top of the plywood board 2 and the lower end of the UHPC formwork 1, when pouring concrete into the UHPC formwork 1, the concrete is not likely to flow out from the gap between the UHPC formwork 1 and the plywood board 2.

[0048] Refer to Figure 4 and Figure 5 , it should be noted that both ends of the protruding blocks 21 and the T-shaped sealing strip 23 are provided with 45-degree bevels. When the four plywood boards 2 are arranged around the void at the column foot of the UHPC formwork 1, the ends of the adjacent two protruding blocks 21 are mutually attached, and the ends of the adjacent two T-shaped sealing strips 23 are mutually attached. In this way, the ends of the adjacent two protruding blocks 21 can be connected, and the ends of the adjacent two T-shaped sealing strips 23 can be connected to each other to improve the overall stability.

[0049] Furthermore, a T-shaped cavity 233 is formed inside the T-shaped sealing strip 23. The length direction of the T-shaped cavity 233 is parallel to the length direction of the T-shaped sealing strip 23, and a plurality of pinholes 234 communicating with the T-shaped cavity 233 are formed at the top of the T-shaped sealing strip 23. After the vertical part 231 of the T-shaped sealing strip 23 is installed in the installation groove 22, glue is injected into the T-shaped cavity 233 inside the T-shaped sealing strip 23 through the pinholes 234, and the glue here is anaerobic glue. It should be noted that the T-shaped sealing strip 23 is manufactured as follows: each T-shaped sealing strip 23 is formed by bonding two sealing strips of the same length. One end of the sealing strip is open, and the other end is closed. The open ends of the two sealing strips are bonded together with glue, and a T-shaped sealing strip 23 is obtained after the glue cures.

[0050] Since the protruding block 21 of this application is a copper block, the protruding block 21 has good heat conduction ability. After installing the vertical part 231 of the T-shaped sealing strip 23 into the installation groove 22, glue is injected into the T-shaped cavity 233 inside the T-shaped sealing strip 23 through the pinhole 234. Then, four plywood boards 2 are arranged around the void left at the column foot of the UHPC formwork 1. Since the distance between the bottom end of the plywood board 2 and the top surface of the T-shaped sealing strip 23 is slightly greater than the size of the void left at the column foot of the UHPC formwork 1, when the T-shaped sealing strip 23 seals the top end of the plywood board 2 and the lower end of the UHPC formwork 1, the T-shaped sealing strip 23 can be slightly squeezed to improve the sealing performance. During this process, after the T-shaped sealing strip 23 is slightly squeezed, a small part of the glue in the T-shaped cavity 233 can be discharged along the pinhole 234 to the position between the T-shaped sealing strip 23 and the lower end of the UHPC formwork 1, and it can be initially cured within 0.5 h to complete the installation of the plywood board 2. And after the glue between the plywood boards 2 is cured, concrete is poured into the UHPC formwork 1. Since the cement in the concrete will undergo a hydration reaction after being mixed with water, which is an exothermic process, especially in the first few hours after the concrete is poured, the heat generated by the concrete can be conducted through the protruding block 21 to the T-shaped sealing strip 23. The T-shaped sealing strip 23 expands slightly when heated. The T-shaped sealing strip 23 not only expands outwards but also inwards, making the volume of the T-shaped cavity 233 decrease, so that the glue in the T-shaped cavity 233 can be slowly pushed out, and the glue in the T-shaped cavity 233 can be discharged along the pinhole 234 to the position between the T-shaped sealing strip 23 and the lower end of the UHPC formwork 1. In addition, the heat of the concrete can also accelerate the curing of the glue. In this embodiment, the T-shaped sealing strip 23 is made of silicone rubber, which has a relatively high coefficient of thermal expansion, making its dimensional change more obvious when the temperature changes.

[0051] Preferably, one end of each of the two protruding blocks 21 close to each other is provided with serrations, and the two ends of the vertical part 231 of the T-shaped sealing strip 23 are also serrated, so that the serrations of the protruding block 21 can cooperate with the serrations of the protruding block 21. Due to the serrated setting, when installing the T-shaped sealing strip 23, it needs to be inserted from one end of the installation groove 22 and slowly guided into the installation groove 22.

[0052] The serrated setting can not only clamp the T-shaped sealing strip 23 to improve the connection stability between the T-shaped sealing strip 23 and the protruding block 21, but also increase the contact area between the protruding block 21 and the T-shaped sealing strip 23, making it easier for the protruding block 21 to conduct heat into the T-shaped sealing strip 23.

[0053] Further, a plurality of horizontal exhaust grooves 235 are formed at the top of the T-shaped sealing strip 23. The positions of the horizontal exhaust grooves 235 correspond to those of the pinholes 234, and both ends of the exhaust grooves penetrate through both ends of the T-shaped sealing strip 23. The length direction of the horizontal exhaust grooves 235 is parallel to the length direction of the T-shaped sealing strip 23. A plurality of vertical exhaust grooves 236 are formed at the top of the T-shaped sealing strip 23. The vertical exhaust grooves 236 communicate with the horizontal exhaust grooves 235, penetrate through the periphery of the horizontal part 232 of the T-shaped sealing strip 23, and the length direction of the vertical exhaust grooves 236 is perpendicular to the length direction of the horizontal exhaust grooves 235.

[0054] After the glue in the T-shaped cavity 233 is discharged from the pinholes 234, the glue can be discharged to the position between the T-shaped sealing strip 23 and the lower end of the UHPC formwork 1. Due to the arrangement of the plurality of horizontal exhaust grooves 235 and the plurality of vertical exhaust grooves 236, after the glue is discharged from the pinholes 234, the air at the horizontal exhaust grooves 235 and the vertical exhaust grooves 236 can be pushed, facilitating the smooth discharge of the glue.

[0055] Refer to Figure 1 , a plurality of exhaust holes 12 are formed in the UHPC formwork 1. During the concrete pouring process, the concrete may contain air or other gases. The exhaust holes 12 can provide a channel for these gases to escape before the concrete solidifies, thereby reducing the air bubbles inside the concrete and improving the density and durability of the concrete. If the gases in the concrete cannot be effectively discharged, air holes may be formed inside the concrete, and these air holes may become the weaknesses of the concrete, affecting its structural performance. By forming the exhaust holes 12, the occurrence of such defects can be reduced.

[0056] S3: Refer to Figure 2 and Figure 3 , according to the different cross-sectional dimensions of the UHPC formwork 1, the keels are divided into four sections, two transverse keels 3 and two longitudinal keels 4. The lengths of the transverse keels 3 and the longitudinal keels 4 are fixed and adjusted through the positions of the bolt holes 321 to meet the size requirements of different column cross-sections.

[0057] Alternatively, one transverse keel 3 and one longitudinal keel 4 are welded and fixed to form two diagonal fixing frames, and then the keel end positions of the two diagonal fixing frames are fixed by passing fixing bolts through the fixing screw holes.

[0058] The transverse keel 3 includes a transverse sleeve 31 and a transverse square tube 32. There are two transverse square tubes 32 on each transverse keel 3, and the two transverse square tubes 32 are respectively inserted through both ends of the transverse sleeve 31. A plurality of sleeve holes 311 are formed in the transverse sleeve 31, and a plurality of bolt holes 321 are formed in the transverse square tube 32. It should be noted that the structure of the longitudinal keel 4 is the same as that of the transverse keel 3. The longitudinal keel 4 includes a longitudinal sleeve and a longitudinal square tube. There are two longitudinal square tubes on each longitudinal keel 4, and the two longitudinal square tubes are respectively inserted through both ends of the longitudinal sleeve. A plurality of sleeve holes 311 are formed in the longitudinal sleeve, and a plurality of bolt holes 321 are formed in the longitudinal square tube.

[0059] When it is necessary to adjust the length of the transverse keel 3, adjust the lengths of the two transverse square tubes 32 extending out of the transverse sleeve 31, then pass the transverse bolt 33 through the aligned sleeve holes 311 and bolt holes 321, and connect the transverse nut 34 to the transverse bolt 33. Similarly, the length of the longitudinal keel 4 can be adjusted.

[0060] A plurality of rows of transverse keels 3 and longitudinal keels 4 are arranged in the vertical direction. Connecting screws 5 are inserted between the multiple rows of transverse keels 3, and a plurality of connecting nuts 51 are threadedly connected to the connecting screws 5 so that the multiple connecting nuts 51 can respectively abut against the top and bottom of the transverse keel 3. In this way, the connection strength between the multiple rows of transverse keels 3 can be improved to improve the overall stability of the plywood 2, facilitating the subsequent pouring of concrete.

[0061] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A construction technology for formwork support of a UHPC formwork square column assembly structure, characterized in that, It includes the following steps: S1: Install the UHPC formwork (1) on the floor to act as a formwork, and leave a space at the column foot of the UHPC formwork (1). S2: Bind and fix the vertical steel bars (11) of the UHPC formwork (1) to the lower-layer steel bars and make lightning protection connections, and use plywood (2) to seal and fix the space left at the column foot of the UHPC formwork (1). After applying glue to the bonding surfaces at the left and right ends of each piece of plywood (2), install a protruding block (21) at the upper end of the plywood (2). The protruding block (21) is a copper block, so that an installation groove (22) is formed between the two protruding blocks (21), and install a T-shaped sealing strip (23) in the installation groove (22), so that the vertical part (231) of the T-shaped sealing strip (23) is located in the installation groove (22). When surrounding the space left at the column foot of the UHPC formwork (1) with four pieces of plywood (2), the T-shaped sealing strip (23) can seal the top of the plywood (2) and the lower end of the UHPC formwork (1). A T-shaped cavity (233) is opened inside the T-shaped sealing strip (23), and a plurality of pinholes (234) communicating with the T-shaped cavity (233) are opened at the top of the T-shaped sealing strip (23). After installing the vertical part (231) of the T-shaped sealing strip (23) in the installation groove (22), inject glue into the T-shaped cavity (233) inside the T-shaped sealing strip (23) through the pinholes (234). One end of the two protruding blocks (21) close to each other is set to be serrated, and both ends of the vertical part (231) of the T-shaped sealing strip (23) are serrated to cooperate with the protruding blocks (21). A plurality of horizontal exhaust grooves (235) are opened at the top of the T-shaped sealing strip (23). The positions of the horizontal exhaust grooves (235) correspond to those of the pinholes (234), and both ends of the exhaust grooves penetrate through both ends of the T-shaped sealing strip (23). A plurality of vertical exhaust grooves (236) communicating with the horizontal exhaust grooves (235) are opened at the top of the T-shaped sealing strip (23), and the vertical exhaust grooves (236) penetrate through the periphery of the horizontal part (232) of the T-shaped sealing strip (23). S3: According to the different cross-sectional dimensions of the UHPC formwork (1), divide the keels into four sections, two transverse keels (3) and two longitudinal keels (4), and adjust the lengths of the transverse keel (3) and the longitudinal keel (4) by fixing the positions of the bolt holes (321) to meet the size requirements of different column cross-sections; or, weld and fix one transverse keel (3) and one longitudinal keel (4) to form two diagonal fixing frames, and then fix the keel end positions of the two diagonal fixing frames by passing fixing bolts through the fixing screw holes.

2. The formwork support construction process of a UHPC formwork square column assembly structure according to claim 1, characterized in that: In step S3, the transverse keel (3) includes a transverse sleeve (31) and transverse square tubes (32) inserted through both ends of the transverse sleeve (31). A plurality of sleeve holes (311) are opened on the transverse sleeve (31), and a plurality of bolt holes (321) are opened on the transverse square tubes (32). When it is necessary to adjust the length of the transverse keel (3), adjust the lengths of the two transverse square tubes (32) extending out of the transverse sleeve (31), and then pass the transverse bolt (33) through the aligned sleeve holes (311) and bolt holes (321), and connect the transverse nut (34) to the transverse bolt (33).

3. The formwork support construction process of a UHPC formwork square column assembly structure according to claim 2, characterized in that: In step S3, multiple rows of transverse keels (3) and longitudinal keels (4) are arranged vertically. A connecting screw rod (5) is inserted between the multiple rows of transverse keels (3), and a plurality of connecting nuts (51) are threadedly connected to the connecting screw rod (5) so that the connecting nuts (51) are abutted against the transverse keels (3).

4. The construction technology of formwork support for the UHPC formwork square column assembly structure according to claim 1, characterized in that: In step S2, when using plywood (2) for closing and fixing, first determine the size of the void at the column foot of the UHPC formwork (1) to determine the size of the plywood (2) to be used. Surface treatment is carried out on the bonding surfaces at the left and right ends of the plywood (2). Glue is applied to the bonding surfaces at the left and right ends of each piece of plywood (2). Both opposite ends of the plywood (2) are provided with bevel angles. Then, four pieces of plywood (2) are arranged around the void at the column foot of the UHPC formwork (1) so that the end faces of adjacent two pieces of plywood (2) are adhesively bonded to each other.

5. The construction process of formwork support for the UHPC formwork square column assembly structure according to claim 1, characterized in that: In step S2, both ends of the protruding block (21) and the T-shaped sealing strip (23) are provided with bevel angles. When arranging four pieces of plywood (2) around the void at the column foot of the UHPC formwork (1), the ends of adjacent two protruding blocks (21) are mutually fitted, and the ends of adjacent two T-shaped sealing strips (23) are mutually fitted.

6. The construction process of formwork support for the UHPC formwork square column assembly structure according to claim 1, characterized in that: In step S2, a plurality of exhaust holes (12) are formed in the UHPC formwork (1).

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