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

Abstract

The invention 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 formwork shell and the steel sleeve are fixed through a stud and a nut, the ECC formwork shell and the profile steel core column hook the openable steel bar truss with the hinge through a steel bar flat hook, and the steel sleeve and the profile steel core column are in bolt connection in pairs through the connecting plate with the hole and the steel plate with the hole. The ECC formwork shell and the steel sleeve serve as permanent formworks of the steel reinforced concrete huge column, the outer vertical face is flat, the ECC formwork shell and the steel sleeve define a square columnar cavity structure with the steel core column, concrete is poured into the cavity structure, construction is completed after the concrete is solidified, and the ECC formwork shell, the steel sleeve and the cast-in-place concrete are cooperatively stressed. The giant steel reinforced concrete column provided by the invention is good in durability, low in cost and high in construction efficiency.

Description

Technical Field

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

[0002] Steel-concrete giant columns are mostly used as the main load-bearing components in the bottom or lower floors of heavy-load structures, such as super-high-rise buildings and large-span bridge piers. The traditional construction of steel-concrete giant columns uses a complex process of large-area formwork and steel bar binding. The construction process is cumbersome, labor-intensive, time-consuming and labor-intensive, and the formwork is difficult to recycle. In addition, the ordinary concrete protective layer has poor load-bearing performance and poor durability. It is difficult to maintain the normal service of the components for a long time under extreme loads and harsh environments.

[0003] In recent years, fiber-reinforced cementitious composites (ECC) have gradually developed in the field of civil engineering. This is a special type of high-performance fiber-reinforced concrete composite material with advantages such as ultra-high toughness, multi-crack cracking, and self-healing. However, ECC materials are expensive, and large-scale use will significantly increase the cost of the project. Summary of the invention

[0004] Purpose of the invention: The first purpose of the present invention is to provide a segmented ECC formwork steel-concrete giant column with good durability and low cost; the second purpose of the present invention is to provide a construction method of the segmented ECC formwork steel-concrete giant column with high efficiency.

[0005] Technical solution: The segmented ECC formwork steel concrete giant column of the present invention comprises a steel core column, and ECC formworks and steel sleeves are alternately arranged from bottom to top outside the steel core column, and a plurality of screws are anchored along the circumference at the top and bottom of the ECC formwork. The cross section of the steel sleeve is in the shape of a channel steel, and a plurality of bolt holes for the screws to pass through are arranged at the top and bottom thereof, and the ECC formwork and the steel sleeve are fixed by screws and nuts; the outer surfaces of the four flange plates of the steel core column are all provided with perforated steel plates and steel trusses with hinges that can be opened and closed, and a plurality of 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 arranged 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, the ECC formwork and the steel sleeve, and the ECC formwork and the steel sleeve are used 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 mold shell are pre-embedded screws.

[0007] Furthermore, there are multiple perforated steel plates arranged 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 bar truss is wavy in shape and is vertically arranged on the outer surface of the flange plate through a plurality of hinges. A steel bar flat hook is anchored on the inner wall of the ECC formwork corresponding to each outwardly protruding position of the steel bar 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 giant column of the present invention comprises:

[0014] (1) Weld perforated steel plates and steel trusses with hinges on the outer surface of each flange plate of the steel core column. The steel trusses initially fit the outer surface of the flange plate so that the ECC formwork can pass through the steel core column;

[0015] (2) The prefabricated ECC formwork is passed through the steel core column from top to bottom through the lifting equipment. After the lifting 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 connection between the ECC formwork and the steel core column in the horizontal direction;

[0016] (3) The prefabricated steel sleeve is passed through the steel core column from top to bottom through the lifting equipment and overlapped on the top of the ECC formwork. The screw at 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 passes 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 sleeve are used in the weakest protective layer of steel-concrete giant columns. On the one hand, the integral ECC formwork and steel sleeve serve as permanent formwork and form a cylindrical cavity with the internal steel core column to facilitate concrete pouring; on the other hand, they also serve as the protective layer of the column to participate in the stress during the service period. 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 ​​in sections on site. 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 a 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 work of all parts; the effective connection of the ECC formwork and the steel sleeve in the length direction, the facade is flat, and the bolt connection will not form a weak stress area, and there is no wet operation at the connection. The connection and the concrete pouring in the cavity are integrally formed; 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 the ECC formwork and the steel sleeve 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 It is a structural schematic diagram of a segmented splicing ECC formwork steel concrete giant column 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 schematic diagram of the structure of a steel core column in 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] Fig. 9 is a schematic diagram of the structure of a perforated steel plate in an embodiment of the present invention;

[0034] Fig.10 It is a schematic structural diagram of a steel bar truss with hinges that can be opened and closed in an embodiment of the present invention;

[0035] Fig.11 is a structural schematic diagram of an ECC mold shell in an embodiment of the present invention;

[0036] Fig.12 yes Fig.11 A top view of

[0037] Fig.13 yes Fig.11 Bottom view of

[0038] Fig.14 It is a 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] Fig.15 is a schematic structural diagram of a steel sleeve in an embodiment of the present invention;

[0040] Fig.16 yes Fig.15 A top view of

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

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

[0043] Fig.19 yes Fig.18A top view of

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

[0045] Fig.21 It is a plan view of the connection structure between the steel sleeve and the steel core column in the embodiment of the present invention;

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

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

[0048] Attached 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, wherein the steel core column 1 is cross-shaped and has four flange plates.

[0051] The ECC formwork 2 and the steel sleeve 3 are arranged alternately from bottom to top outside the steel core column 1. A plurality of screws 8 are anchored along the circumference at the top and bottom of the ECC formwork 2. The screws 8 are pre-embedded screws. The cross section of the steel sleeve 3 is in the shape of a channel steel. A plurality of bolt holes 10 are arranged at the top and bottom thereof for the screws 8 to pass through. The ECC formwork 2 and the steel sleeve 3 are fixed by the screws 8 and the nuts 9.

[0052] The outer surfaces of the four flange plates of the steel core column 1 are all provided with perforated steel plates 13 and steel trusses 4 with hinges 5 that can be opened and closed, wherein the perforated steel plates 13 are welded and fixed on the outer surfaces of the flange plates, and the number of perforated steel plates 13 provided on the outer surface of each flange plate is two and arranged at intervals. The steel trusses 4 are wavy in shape and are vertically arranged on the outer surfaces of the flange plates through multiple hinges 5, and the hinges 5 are welded and fixed on the outer surfaces of the flange plates. A steel flat hook 6 is anchored on the inner wall of the ECC formwork 2 corresponding to each outwardly protruding position of the steel truss 4, and 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 unfolded outward, so as to realize 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] A holed connecting plate 11 is provided at the position of the inner wall of the steel sleeve 3 corresponding to the holed steel plate 13. The holed connecting plate 11 and the holed steel plate 13 are fixed in pairs by bolts 7 and nuts 9 to realize the horizontal connection between the steel core column 1 and the steel sleeve 3. The holed connecting plate 11 also plays a stiffening role. In addition, a plurality of stiffening plates 12 are provided circumferentially inside the steel sleeve 3. The holed connecting plate 11 and the stiffening plates 12 jointly ensure the structural stability of the steel sleeve 3.

[0054] The above connection method ensures the mutual connection of the steel core column 1, the ECC formwork 2 and the steel sleeve 3. The ECC formwork 2 and the steel sleeve 3 serve as the permanent formwork of the concrete steel giant column, and enclose the steel core column 1 to form a square columnar cavity structure, in which concrete 14 is poured. 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.

[0055] The embodiment of the present invention also provides a construction method of the segmented ECC formwork steel concrete giant column according to the embodiment of the present invention, comprising:

[0056] (1) A perforated steel plate 13 and a steel truss 4 with hinges 5 are welded to the outer surface of each flange plate of the steel core column 1. To facilitate subsequent construction, the steel truss 4 is initially attached to the outer surface of the flange plate (e.g. Figures 6 to 8 As shown), ensure that the ECC mold shell 2 can be placed smoothly;

[0057] (2) The prefabricated ECC formwork 2 is passed through the steel core column 1 from top to bottom through the lifting equipment. After the lifting is completed, the steel trusses 4 on the outer surface of each flange plate are unfolded outward (such as Figures 3 to 5 As shown), the steel truss 4 is connected to the corresponding steel flat hook 6 (which has been embedded in the inner wall of the ECC formwork 2 during factory prefabrication) (as shown in FIG. Fig.14 As shown), the ECC formwork 2 and the steel core column 1 are connected in the horizontal direction;

[0058] (3) The prefabricated steel sleeve 3 is passed through the steel core column 2 from top to bottom through the lifting equipment and overlapped on the top of the ECC mold shell 2. The screw 8 on the top of the ECC mold shell 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 mold shell 2 (such as Fig. 22 shown);

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

[0060] (4) The prefabricated ECC formwork 2 is passed through the steel core column 1 from top to bottom through the lifting equipment, the screw 8 at the bottom of the ECC formwork 2 passes 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 (such as Fig. 22 shown);

[0061] (5) Repeat steps (3) and (4) until the number of ECC formwork shells 2 and steel sleeves 3 reaches the designed number. The number and height of the ECC formwork shells 2 and steel sleeves 3 are determined according to the height of the steel concrete megacolumn, actual construction conditions, and transportation conditions. Finally, pour concrete 14 and complete the construction after the concrete solidifies.

Claims

1. A segmented ECC formwork steel concrete giant column, characterized in that: 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), a plurality of screw rods (8) are anchored along the circumferential direction at the top and bottom of the ECC formwork (2), the cross section of the steel sleeve (3) is in the shape of a channel steel, and a plurality of bolt holes (10) are arranged at the top and bottom of the steel sleeve (3) for the screw rods (8) to pass through, and the ECC formwork (2) and the steel sleeve (3) are fixed by the screw rods (8) and nuts (9); the outer surfaces of the four flange plates of the steel core column (1) are all provided with perforated steel plates (13) and a steel truss (4) with hinges (5) that can be opened and closed, and a plurality of steel flat hooks (6) are anchored on the inner wall of the ECC formwork (2) for hanging the steel truss (4) when it is expanded outwards. The corresponding steel bar trusses (4) realize the connection between the steel core column (1) and the ECC formwork (2) in the horizontal direction; the inner wall of the steel sleeve (3) is provided with a hole connection plate (11) at a position corresponding to the hole steel plate (13); the hole connection 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 in the cavity enclosed 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.

2. The segmented ECC formwork steel concrete giant column 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 giant column according to claim 1 is characterized in that: The number of perforated steel plates (13) arranged 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 on the outer surface of the flange plate.

5. The segmented ECC formwork steel concrete giant column according to claim 1 is characterized in that: The steel bar truss (4) is wavy in shape 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 steel bar truss (4) on the inner wall of the ECC formwork (2).

6. The segmented ECC formwork steel concrete giant column according to claim 5 is characterized in that: The steel bar flat hook (6) has a length and an angle that matches the hanging position of the steel bar truss (4).

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

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

9. A construction method for the segmented ECC formwork steel concrete giant column according to claim 1, characterized in that: include: (1) Welding a perforated steel plate (13) and a steel truss (4) with a hinge (5) on the outer surface of each flange plate of the steel core column (1), wherein the steel truss (4) initially fits 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 lifting device. After the lifting is completed, the steel trusses (4) on the outer surface of each flange plate 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 means of a lifting device and overlapped on the top of the ECC formwork (2). The screw (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 (8) is tightened to achieve the connection between the steel sleeve (3) and the ECC formwork (2); Then, the perforated connecting plate (11) and the perforated steel plate (13) on the inner wall of the steel sleeve (3) 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 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), and the nut (9) at the end of the screw rod (8) is tightened to achieve 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.

10. The construction method of the segmented ECC formwork steel concrete giant column according to claim 9 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 giant column, actual construction conditions and transportation conditions.

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