Segmental splicing type ECC formwork steel concrete giant column and construction method thereof

Abstract

The application discloses a segmented splicing type ECC formwork steel reinforced concrete giant column and a construction method thereof, the steel reinforced concrete giant column comprises a steel core column, and ECC formworks and steel sleeves are alternately arranged outside the steel core column from bottom to top; the ECC formworks and the steel sleeves are fixed through studs and nuts, the ECC formworks and the steel core column are hooked through steel bar flat hooks to form steel bar trusses with hinges which can be opened and closed, and the steel sleeves and the steel core column are connected through bolt connection of a pair of hole connecting plates and hole steel plates; the ECC formworks and the steel sleeves serve as permanent formworks of the steel reinforced concrete giant column, the outer facade is flat, and the steel core column is surrounded to form a square columnar cavity structure, concrete is poured in the cavity structure, and the construction is completed after the concrete is solidified; the ECC formworks, the steel sleeves and the cast-in-situ concrete are cooperatively stressed. The steel reinforced concrete giant column provided by the application has good durability, low cost and high construction efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering and relates to a segmented spliced ​​ECC formwork steel concrete giant column and a construction method thereof. Background Art

[0002] Steel-concrete megacolumns are often used as primary load-bearing components on the ground floor or lower floors of heavy-duty structures, such as super-high-rise buildings and long-span bridge piers. Traditionally, the construction of steel-concrete megacolumns involves a complex process involving extensive formwork support and removal, as well as rebar binding. This process is cumbersome, labor-intensive, time-consuming, and labor-intensive, and the formwork is difficult to recycle. Furthermore, the poor mechanical properties and durability of conventional concrete cover make it difficult to maintain long-term service under extreme loads and harsh environments.

[0003] In recent years, fiber-reinforced cementitious composites (ECCs) have gained popularity in civil engineering. These special, high-performance fiber-reinforced concrete composites offer advantages such as ultra-high toughness, multi-crack resistance, and self-healing properties. However, ECC materials are expensive, and their widespread use significantly increases project costs. Summary of the Invention

[0004] Objectives of the invention: The first objective of the invention is to provide a durable, low-cost, segmented ECC formwork steel-concrete mega-column. The second objective of the invention is to provide a highly efficient construction method for segmented ECC formwork steel-concrete mega-columns.

[0005] Technical solution: The segmented ECC formwork steel-concrete giant column described in the present invention includes a steel core column. ECC formwork and steel sleeves are alternately arranged from bottom to top on the outside of the steel core column. Several screws are anchored circumferentially at the top and bottom of the ECC formwork. The steel sleeve has a channel-shaped cross-section and is provided with several bolt holes at the top and bottom for the screws to pass through. The ECC formwork and steel sleeve are fixed together by screws and nuts. The outer surfaces of the four flange plates of the steel core column are provided with perforated steel plates and hinged steel trusses. Several steel flat hooks are anchored on the inner wall of the ECC formwork. , which is used to hang the corresponding steel truss when the steel truss is expanded outward, so as to realize the horizontal connection between the steel core column and the ECC formwork; a perforated connecting plate is provided on the inner wall of the steel sleeve corresponding to the position of the perforated steel plate, and the perforated connecting plate and the perforated steel plate are fixed in pairs by bolts and nuts to realize the horizontal connection between the steel core column and the steel sleeve; concrete is poured in the cavity formed by the steel core column, ECC formwork and steel sleeve, and the ECC formwork and steel sleeve serve as permanent formwork; the web of the steel sleeve is flush with the outer wall of the ECC formwork to make the facade of the giant column flat.

[0006] Furthermore, the screws at the top and bottom of the ECC formwork are pre-embedded screws.

[0007] Furthermore, there are multiple perforated steel plates provided on the outer surface of each flange plate, which are arranged at intervals.

[0008] Furthermore, the perforated steel plate is welded and fixed to the outer surface of the flange plate.

[0009] Furthermore, the steel truss is wavy and vertically arranged on the outer surface of the flange plate through multiple hinges, and a steel flat hook is anchored on the inner wall of the ECC formwork corresponding to each outward protruding position of the steel truss.

[0010] Furthermore, the steel bar flat hook has a length and an angle that matches the steel bar truss hanging position.

[0011] Furthermore, the hinge is welded and fixed to the outer surface of the flange plate.

[0012] Furthermore, a plurality of stiffening plates are arranged circumferentially inside the steel sleeve to enhance the rigidity of the steel sleeve.

[0013] The construction method of the segmented ECC formwork steel concrete mega-column of the present invention comprises:

[0014] (1) Weld perforated steel plates and hinged steel trusses to the outer surfaces of the flanges of the steel core columns. The steel trusses initially adhere to the outer surfaces of the flanges so that the ECC formwork can pass through the steel core columns.

[0015] (2) The factory-made ECC formwork is passed through the steel core column from top to bottom through the hoisting equipment. After the hoisting is completed, the steel trusses on the outer surface of each flange plate are unfolded outward so that the steel trusses are hooked with the corresponding steel flat hooks to complete the horizontal connection between the ECC formwork and the steel core column;

[0016] (3) The prefabricated steel sleeve is passed through the steel core column from top to bottom by the lifting equipment and overlapped on the top of the ECC formwork. The screw on the top of the ECC formwork passes through the bolt hole at the bottom of the steel sleeve, and the nut at the end of the screw is tightened to achieve the connection between the steel sleeve and the ECC formwork;

[0017] Then, the perforated connecting plate on the inner wall of the steel sleeve and the perforated steel plate are fixed in pairs by bolts and nuts to realize the connection between the steel sleeve and the steel core column;

[0018] (4) The prefabricated ECC formwork is passed through the steel core column from top to bottom through the lifting equipment, the screw at the bottom of the ECC formwork is passed through the bolt hole at the top of the steel sleeve, and the nut at the end of the screw is tightened to achieve the connection between the steel sleeve and the ECC formwork;

[0019] (5) Repeat steps (3) and (4) until the number of ECC formwork and steel sleeves reaches the designed number; finally, pour concrete and complete the construction after the concrete solidifies.

[0020] Furthermore, the number and height of the ECC formwork and steel sleeves are determined according to the height of the steel concrete megacolumn, actual construction conditions, and transportation conditions.

[0021] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0022] (1) ECC formwork and steel sleeves are used in the protective layer of the steel-concrete giant column where the stress is the weakest. On the one hand, the integral ECC formwork and steel sleeve serve as a permanent formwork and form a cylindrical cavity with the internal steel core column, which is convenient for pouring concrete; on the other hand, it also participates in the stress during the service period as the protective layer of the column. The ECC formwork can give full play to the superior performance of ECC materials, overcome the shortcomings of ordinary concrete protective layer that is easy to peel off and has significant brittleness, and improve the durability and stress resistance of the column in harsh environments. Since ECC materials are only used locally, the project cost will not be significantly increased.

[0023] (2) The ECC formwork and steel sleeve are prefabricated in the factory and spliced ​​on site in sections. The ECC formwork and steel sleeve are fixed by studs and nuts. The ECC formwork and steel core column are hooked to the hinged steel truss by steel flat hooks. The steel sleeve and steel core column are connected to the perforated steel plate in pairs through the perforated connecting plate. Therefore, no formwork is required on site, which greatly reduces the construction time of formwork support and dismantling during on-site construction and improves construction efficiency.

[0024] (3) The steel-concrete giant column structure of the present invention ensures the effective connection of all components in the cross-sectional direction and the coordinated operation of all parts; the length direction ensures the effective connection of the ECC formwork and the steel sleeve, the facade is flat, and the use of bolt connection will not form a weak stress area, and there is no wet operation at the connection. The connection and the concrete in the cavity are cast into one piece; multiple highly welded steel trusses with hinges on the flange can realize multi-point connection between the ECC formwork and the steel core column, thereby improving the integrity of the component.

[0025] (4) The present invention can adjust the number and size of ECC formwork and steel sleeves according to actual transportation and installation conditions, and is not limited by the height of the giant column. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 2. It is a structural schematic diagram of a segmented ECC formwork steel concrete megacolumn provided by an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 A top view of

[0028] Figure 3 and Figure 6 is a structural diagram of a steel core column according to an embodiment of the present invention, wherein Figure 3 The steel truss is in the expanded state. Figure 6 The steel truss is in contact with the outer surface of the flange plate;

[0029] Figure 4 yes Figure 3 Side view of;

[0030] Figure 5 yes Figure 3 A top view of

[0031] Figure 7 yes Figure 6 Side view of;

[0032] Figure 8 yes Figure 6 A top view of

[0033] Figure 9 2 is a schematic structural diagram of a perforated steel plate according to an embodiment of the present invention;

[0034] Figure 10 1 is a schematic structural diagram of a steel truss with hinges that can be opened and closed according to an embodiment of the present invention;

[0035] Figure 11 2. It is a structural diagram of the ECC formwork in an embodiment of the present invention;

[0036] Figure 12 yes Figure 11 A top view of

[0037] Figure 13 yes Figure 11 Bottom view of

[0038] Figure 14 Schematic diagram of the matching structure of the steel bar flat hook and the steel bar truss in an embodiment of the present invention;

[0039] Figure 15 2 is a schematic structural diagram of a steel sleeve according to an embodiment of the present invention;

[0040] Figure 16 yes Figure 15 A top view of

[0041] Figure 17 is a cross-sectional view of the middle position of the steel sleeve in an embodiment of the present invention;

[0042] Figure 18 yes Figure 1 Schematic diagram of the structure cut along the middle of the steel sleeve;

[0043] Figure 19 yes Figure 18A top view of

[0044] Figure 20 Schematic diagram of the connection structure between the steel sleeve and the steel core column in an embodiment of the present invention;

[0045] Figure 21 This is a plan view of the connection structure between the steel sleeve and the steel core column in an embodiment of the present invention;

[0046] Figure 22 It is a schematic diagram of the connection structure between the ECC formwork and the steel sleeve in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present invention will be further described below with reference to the accompanying drawings.

[0048] Attachment Figures 1 to 22 The reference numerals in the figures are as follows:

[0049] 1. Steel core column; 2. ECC formwork; 3. Steel sleeve; 4. Steel truss; 5. Hinge; 6. Steel hook; 7. Bolt; 8. Screw; 9. Nut; 10. Bolt hole; 11. Perforated connecting plate; 12. Stiffening plate; 13. Perforated steel plate; 14. Concrete.

[0050] like Figures 1 to 22 As shown, an embodiment of the present invention provides a segmented ECC formwork steel-concrete giant column, comprising a steel core column 1, which is cross-shaped and has four flange plates.

[0051] ECC formwork 2 and steel sleeves 3 are alternately arranged from bottom to top around the outer section of the steel core column 1. Several pre-embedded screws 8 are anchored circumferentially at the top and bottom of the ECC formwork 2. The steel sleeve 3 has a channel-shaped cross-section and is provided with several bolt holes 10 at its top and bottom for the screws 8 to pass through. The ECC formwork 2 and steel sleeve 3 are secured together using screws 8 and nuts 9.

[0052] The outer surfaces of the four flanges of the steel core column 1 are provided with perforated steel plates 13 and steel trusses 4 with hinges 5 that can be opened and closed. The perforated steel plates 13 are welded and fixed to the outer surfaces of the flanges. There are two perforated steel plates 13 provided on the outer surface of each flange, and they are arranged at intervals. The steel trusses 4 are wavy in shape and are vertically arranged on the outer surfaces of the flanges through multiple hinges 5, which are welded and fixed to the outer surfaces of the flanges. A steel flat hook 6 is anchored on the inner wall of the ECC formwork 2 at each outwardly protruding position of the steel truss 4. The steel flat hook 6 has a length and angle that matches the hanging position of the steel truss 4. The steel flat hook 6 is used to hang the corresponding steel truss 4 when the steel truss 4 is expanded outward, thereby realizing the horizontal connection between the steel core column 1 and the ECC formwork 2. The length of the steel truss 4 is determined according to the height of the ECC formwork 2.

[0053] The inner wall of the steel sleeve 3 is provided with a perforated connecting plate 11 corresponding to the position of the perforated steel plate 13, and the perforated connecting plate 11 and the perforated steel plate 13 are fixed in pairs through bolts 7 and nuts 9, so as to realize the connection between the steel core column 1 and the steel sleeve 3 in the horizontal direction. The perforated connecting plate 11 also plays a role of stiffening. In addition, a plurality of stiffening plates 12 are arranged in the circumferential direction inside the steel sleeve 3, and the perforated connecting plate 11 and the stiffening plate 12 together ensure the structural stability of the steel sleeve 3.

[0054] The connection between the steel core column 1, the ECC formwork 2 and the steel sleeve 3 is ensured by the above-mentioned connection mode. The ECC formwork 2 and the steel sleeve 3 serve as the permanent formwork of the concrete steel giant column, and together with the steel core column 1, form a square columnar cavity structure, and the cavity structure is poured with concrete 14. The web of the steel sleeve 3 is flush with the outer wall of the ECC formwork 2, so as to make the outer facade of the giant column flat.

[0055] The embodiment of the application also provides a construction method of the segmented splicing type ECC formwork steel concrete giant column.

[0056] (1) welding the perforated steel plate 13 and the steel bar truss 4 with a hinge 5 on the outer surface of each flange plate of the steel core column 1, so as to facilitate subsequent construction, and the steel bar truss 4 is initially attached to the outer surface of the flange plate (as shown in Figures 6 to 8 ), so as to ensure that the ECC formwork 2 can be placed smoothly;

[0057] (2) placing the factory-prepared ECC formwork 2 through the steel core column 1 from top to bottom through hoisting equipment, and after hoisting, unfolding the steel bar truss 4 on the outer surface of each flange plate outward (as shown in Figures 3 to 5 ), so that the steel bar truss 4 is hung with the corresponding steel flat hook 6 (which has been embedded in the inner wall of the ECC formwork 2 during factory preparation) (as shown in Figure 14 ), and the connection between the ECC formwork 2 and the steel core column 1 in the horizontal direction is completed;

[0058] (3) placing the factory-prepared steel sleeve 3 through the steel core column 2 from top to bottom through hoisting equipment, and lapping on the top of the ECC formwork 2, the screw rod 8 at the top of the ECC formwork 2 passes through the bolt hole 10 at the bottom of the steel sleeve 3, and the nut 9 at the end of the screw rod 8 is tightened, so as to realize the connection between the steel sleeve 3 and the ECC formwork 2 (as shown in Figure 22 );

[0059] Then, the perforated connecting plate 11 on the inner wall of the steel sleeve 3 and the perforated steel plate 13 are fixed in pairs through bolts 7 and nuts 9, so as to realize the connection between the steel sleeve 3 and the steel core column 1 (as shown in Figure 20 and Figure 21 );

[0060] (4) The prefabricated ECC formwork 2 is passed through the steel core column 1 from top to bottom by hoisting equipment, the screw rod 8 at the bottom of the ECC formwork 2 is passed through the bolt hole 10 at the top of the steel sleeve 3, the nut 9 at the end of the screw rod 8 is tightened, and the connection between the steel sleeve 3 and the ECC formwork 2 is realized (as shown in Figure 22

[0061] (5) Steps (3) and (4) are repeated until the number of the ECC formwork 2 and the steel sleeve 3 reaches the designed number, and the number and height of the ECC formwork 2 and the steel sleeve 3 are determined according to the height of the steel reinforced concrete giant column, the actual construction condition and the transportation condition, etc.; finally, the concrete 14 is poured, and the construction is completed after the concrete is solidified.​

Claims

1. A segmented ECC formwork steel concrete giant column, characterized by: The invention comprises a steel core column (1), wherein an ECC formwork (2) and a steel sleeve (3) are alternately arranged from bottom to top on the outside of the steel core column (1), and the ECC formwork (2) is an integral structure; a plurality of screw rods (8) are anchored on the top and bottom of the ECC formwork (2) along the circumferential direction; the cross section of the steel sleeve (3) is in the shape of a channel steel, and a plurality of bolt holes (10) for the screw rods (8) to pass through are arranged on the top and bottom thereof; the ECC formwork (2) and the steel sleeve (3) are fixed by the screw rods (8) and the nuts (9); the outer surfaces of the four flange plates of the steel core column (1) are all provided with a perforated steel plate (13) and a steel truss (4) with a hinge (5) that can be opened and closed; a plurality of steel flat hooks (6) are anchored on the inner wall of the ECC formwork (2) for opening and closing the steel truss (4) when the steel truss (4) is opened and closed. When unfolded, the corresponding steel truss (4) is hung to realize the connection between the steel core column (1) and the ECC formwork (2) in the horizontal direction; a hole connecting plate (11) is provided on the inner wall of the steel sleeve (3) at a position corresponding to the hole steel plate (13); the hole connecting plate (11) and the hole steel plate (13) are fixed in pairs by bolts (7) and nuts (9) to realize the connection between the steel core column (1) and the steel sleeve (3) in the horizontal direction; concrete (14) is poured into the cavity formed by the steel core column (1), the ECC formwork (2) and the steel sleeve (3), and the ECC formwork (2) and the steel sleeve (3) serve as permanent templates; the web of the steel sleeve (3) is flush with the outer wall of the ECC formwork (2) to make the outer facade of the giant column flat; The steel bar truss (4) is wavy and is vertically arranged on the outer surface of the flange plate through a plurality of hinges (5). A steel bar flat hook (6) is anchored at each outwardly protruding position of the inner wall of the ECC formwork (2) corresponding to the steel bar truss (4); the steel bar flat hook (6) has a length and angle that matches the hanging position of the steel bar truss (4).

2. The segmented ECC formwork steel concrete megacolumn according to claim 1 is characterized in that: The screws (8) at the top and bottom of the ECC mold shell (2) are pre-embedded screws.

3. The segmented ECC formwork steel concrete megacolumn according to claim 1 is characterized in that: The number of perforated steel plates (13) provided on the outer surface of each flange plate is multiple and arranged at intervals.

4. The segmented ECC formwork steel-concrete giant column according to claim 1 or 3, characterized in that: The perforated steel plate (13) is welded and fixed to the outer surface of the flange plate.

5. The segmented ECC formwork steel concrete megacolumn according to claim 1 is characterized in that: The hinge (5) is welded and fixed to the outer surface of the flange plate.

6. The segmented ECC formwork steel concrete megacolumn according to claim 1 is characterized in that: A plurality of stiffening plates (12) are arranged circumferentially inside the steel sleeve (3).

7. A construction method for the segmented ECC formwork steel concrete megacolumn according to claim 1, characterized in that: include: (1) Welding a perforated steel plate (13) and a steel truss (4) with a hinge (5) to the outer surface of each flange plate of the steel core column (1), the steel truss (4) initially fitting the outer surface of the flange plate so that the ECC formwork (2) passes through the steel core column (1); (2) The factory-prefabricated ECC formwork (2) is passed through the steel core column (1) from top to bottom by means of a hoisting device. After the hoisting is completed, the steel trusses (4) on the outer surfaces of the flange plates are unfolded outwards so that the steel trusses (4) are hooked with the corresponding steel flat hooks (6), thereby completing the connection between the ECC formwork (2) and the steel core column (1) in the horizontal direction; (3) The factory-prefabricated steel sleeve (3) is passed through the steel core column (1) from top to bottom by a lifting device and overlapped on the top of the ECC formwork (2). The screw (8) on the top of the ECC formwork (2) passes through the bolt hole (10) at the bottom of the steel sleeve (3), and the nut (9) at the end of the screw (8) is tightened to achieve the connection between the steel sleeve (3) and the ECC formwork (2); Then, the perforated connecting plate (11) on the inner wall of the steel sleeve (3) and the perforated steel plate (13) are fixed in pairs by bolts (7) and nuts (9) to achieve the connection between the steel sleeve (3) and the steel core column (1); (4) The prefabricated ECC formwork (2) is passed through the steel core column (1) from top to bottom by means of a lifting device, the screw (8) at the bottom of the ECC formwork (2) is passed through the bolt hole (10) at the top of the steel sleeve (3), and the nut (9) at the end of the screw (8) is tightened to achieve the connection between the steel sleeve (3) and the ECC formwork (2); (5) Repeat steps (3) and (4) until the number of ECC formwork (2) and steel sleeves (3) reaches the designed number; finally, pour concrete (14) and complete the construction after the concrete solidifies.

8. The construction method of segmented ECC formwork steel concrete megacolumn according to claim 7 is characterized in that: The number and height of the ECC formwork (2) and the steel sleeve (3) are determined according to the height of the steel concrete mega-column, actual construction conditions and transportation conditions.

Images