A rectangular steel tube-constrained ultra-high-strength concrete column and its construction method

Abstract

The present invention discloses a rectangular steel tube constrained ultra-high strength concrete column and a construction method thereof, which comprises a steel tube assembly, ultra-high strength concrete and longitudinal steel bars, wherein the steel tube assembly comprises a rectangular steel tube and two rectangular steel sleeves, the outer contours of the two rectangular steel sleeves are adapted to the inner contour of the rectangular steel tube, the two rectangular steel sleeves are respectively sleeved inside the two ends of the rectangular steel tube, and the longitudinal ends of the two rectangular steel sleeves correspond to the two ends of the protruding rectangular steel tube respectively; the ultra-high strength concrete and the longitudinal steel bars are respectively placed inside the steel tube assembly, and the ultra-high strength concrete is fitted with the inner wall of the steel tube assembly. The present invention adopts ultra-high strength concrete to effectively improve the bearing capacity of the structure, and the rectangular cross section has the characteristics of regular arrangement and simple node construction; the addition of a rectangular steel sleeve at the column end can improve the compressive stiffness of the column end section and improve its anti-deformation ability.

Description

Technical Field

[0001] The invention relates to the field of concrete columns, and in particular to a rectangular steel tube-constrained ultra-high-strength concrete column and a construction method thereof. Background Art

[0002] Steel tube confined concrete columns have the characteristics of high bearing capacity and good seismic performance. They have been used in building construction projects and have achieved good economic results. With the improvement of engineering requirements, new challenges have been raised to the bearing capacity of such structures. Filling steel tubes with ultra-high-strength concrete can effectively solve this problem. The restraining effect of steel tubes can also increase the ductility of the structure, which has broad application prospects.

[0003] However, most of these structures are currently circular, which makes the beam-column joint structure complex and difficult to design. In addition, in order to prevent the steel pipe from directly bearing the vertical load, the steel pipe at the column end needs to be removed after the core concrete solidifies. This process can easily damage the core concrete and further increase the construction period. After the steel pipe at the column end is removed, due to the low compressive stiffness of the cross section here, when the entire structure approaches the ultimate load, this position will be the first to be damaged.

[0004] The above problems limit the application and development of steel tube confined concrete columns. Summary of the invention

[0005] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a rectangular steel tube-constrained ultra-high-strength concrete column and a construction method thereof.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A rectangular steel tube constrained ultra-high-strength concrete column comprises a steel tube assembly, ultra-high-strength concrete and longitudinal steel bars, wherein the steel tube assembly comprises a rectangular steel tube and two rectangular steel sleeves, wherein the outer contours of the two rectangular steel sleeves are matched with the inner contour of the rectangular steel tube, the two rectangular steel sleeves are respectively sleeved inside the two ends of the rectangular steel tube, and the longitudinal ends of the two rectangular steel sleeves respectively correspond to the two ends of the protruding rectangular steel tube; the ultra-high-strength concrete and the longitudinal steel bars are respectively placed inside the steel tube assembly, and the ultra-high-strength concrete is in contact with the inner wall of the steel tube assembly.

[0008] Furthermore, both end surfaces in the longitudinal direction of the ultra-high-strength concrete are flush with both end surfaces of the steel pipe assembly.

[0009] Furthermore, the compressive strength of the ultra-high strength concrete is greater than or equal to 100 MPa and is free of coarse aggregate.

[0010] Furthermore, two rectangular steel sleeves are respectively extended from both ends of the longitudinal direction of the longitudinal steel bar, and the two rectangular steel sleeves respectively play a supporting role for the longitudinal steel bar.

[0011] The invention discloses a construction method for a rectangular steel tube-constrained ultra-high-strength concrete column, comprising the following steps:

[0012] 1) The two rectangular steel casings are respectively inserted into the two ends of the rectangular steel pipe, the longitudinal length of the steel pipe assembly is adjusted according to the floor height, and the rectangular steel casing and the rectangular steel pipe are spot welded to form a steel pipe assembly;

[0013] 2) The steel pipe assembly is placed on the floor or node, and fixed after adjusting the verticality;

[0014] 3) Ultra-high-strength concrete is made according to the mix ratio and poured into the steel pipe assembly;

[0015] 4) After the initial setting of the ultra-high-strength concrete, the welding points between the rectangular steel tube and the rectangular steel casing are ground off. After the welding points are ground off, the rectangular steel tube does not directly bear the longitudinal force, but only plays a lateral restraining role on the ultra-high-strength concrete in the tube.

[0016] The present invention adopts the above technical scheme. Compared with the prior art, the present invention has the following beneficial effects: compared with ordinary concrete or high-strength concrete, the use of ultra-high-strength concrete can effectively improve the bearing capacity of the structure; the rectangular cross-section has significant economic advantages such as simple node structure and regular cross-section arrangement; the rectangular steel sleeve at the end of the column can effectively improve the compressive stiffness of the end cross-section, protect the end concrete, and also play a supporting role for the longitudinal steel bars in the tube, effectively improving the problem of weak ends of steel tube-constrained concrete columns; compared with previous construction methods of steel tube-constrained concrete columns, after the initial setting of the concrete in the tube of the present invention, there is no need to perform ring cutting or remove the formwork on the end of the steel tube, which saves steps and makes the construction easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments;

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the longitudinal section of the ultra-high-strength concrete column constrained by a rectangular steel tube according to the present invention. DETAILED DESCRIPTION

[0020] like Figure 1-2As shown, the present invention is a rectangular steel tube constrained ultra-high strength concrete column, which includes a steel tube assembly 1, ultra-high strength concrete 2 and longitudinal steel bars 3. The steel tube assembly 1 includes a rectangular steel tube 12 and two rectangular steel sleeves 11. The outer contours of the two rectangular steel sleeves 11 are adapted to the inner contour of the rectangular steel tube 12. The two rectangular steel sleeves 11 are respectively sleeved inside the two ends of the rectangular steel tube 12, and the longitudinal ends of the two rectangular steel sleeves respectively protrude from the two ends of the rectangular steel tube 12; the ultra-high strength concrete 2 and the longitudinal steel bars 2 are respectively placed inside the steel tube assembly 1, and the ultra-high strength concrete 2 is in contact with the inner wall of the steel tube assembly 1.

[0021] The two end surfaces in the longitudinal direction of the ultra-high-strength concrete 2 are flush with the two end surfaces of the steel pipe assembly 1 respectively.

[0022] The ultra-high-strength concrete 2 has a compressive strength greater than or equal to 100 MPa and contains no coarse aggregate.

[0023] Two rectangular steel sleeves 11 extend from both ends of the longitudinal reinforcement 3 , respectively. The two rectangular steel sleeves 11 play a supporting role for the longitudinal reinforcement 3 .

[0024] The present invention provides a construction method for a rectangular steel tube-constrained ultra-high-strength concrete column, and the construction process comprises the following steps:

[0025] 1) Two rectangular steel casings 11 are partially inserted into the two ends of the rectangular steel pipe 12, the longitudinal length of the steel pipe assembly 1 is adjusted according to the floor height, and the rectangular steel casing 11 and the rectangular steel pipe 12 are spot welded to form the steel pipe assembly 1;

[0026] 2) The steel pipe assembly 1 is placed on the floor or node, and fixed after adjusting the verticality;

[0027] 3) Ultra-high-strength concrete is prepared according to the mix ratio and poured into the steel pipe assembly 1;

[0028] 4) After the ultra-high-strength concrete 2 is initially set, the welding point between the rectangular steel tube 12 and the rectangular steel casing 11 is ground off. After the welding point is ground off, the rectangular steel tube 12 does not directly bear the longitudinal force, but only plays a lateral restraining role on the ultra-high-strength concrete 2 in the tube.

[0029] Advantages of the present invention include:

[0030] 1) The use of ultra-high-strength concrete can greatly improve the bearing capacity of the structure;

[0031] 2) The rectangular cross section has the characteristics of simple node construction and regular plane layout;

[0032] 3) The steel casing at the end of the column can enhance the compressive stiffness of the end section, protect the column concrete, and improve the shear resistance of the structure;

[0033] 4) After the initial setting of the concrete, there is no need to perform circumferential cutting. Only the welding point between the rectangular steel casing 11 and the rectangular steel pipe 12 is ground off, which effectively reduces the damage to the concrete in the pipe and saves the number of workers compared with the current construction process.

[0034] The implementation of the present invention is described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are illustrative rather than limiting the present invention. Those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A construction method for a rectangular steel tube-constrained ultra-high-strength concrete column, characterized in that: The concrete column comprises a steel tube assembly (1), ultra-high-strength concrete (2) and longitudinal steel bars (3); the steel tube assembly (1) comprises a rectangular steel tube (12) and two rectangular steel sleeves (11); the outer contours of the two rectangular steel sleeves (11) are matched to the inner contour of the rectangular steel tube (12); the two rectangular steel sleeves (11) are respectively sleeved inside the two ends of the rectangular steel tube (12), and the longitudinal ends of the two rectangular steel sleeves protrude from the two ends of the rectangular steel tube (12); the ultra-high-strength concrete (2) and the longitudinal steel bars (2) are respectively placed inside the steel tube assembly (1), and the ultra-high-strength concrete (2) is in contact with the inner wall of the steel tube assembly (1); The construction method of the concrete column comprises the following steps: 1) Parts of the two rectangular steel casings (11) are respectively inserted into the two ends of the rectangular steel pipe (12), the longitudinal length of the steel pipe assembly (1) is adjusted according to the floor height, and the rectangular steel casing (11) and the rectangular steel pipe (12) are spot welded together to form a steel pipe assembly (1); 2) The steel pipe assembly (1) is placed on the floor or node, adjusted for verticality, and then fixed; 3) Ultra-high-strength concrete is prepared according to the mix ratio and poured into the steel pipe assembly (1); 4) After the ultra-high-strength concrete (2) has initially set, the weld between the rectangular steel tube (12) and the rectangular steel casing (11) is ground off. After the weld is ground off, the rectangular steel tube (12) does not directly bear the longitudinal force, but only acts as a lateral constraint on the ultra-high-strength concrete (2) in the tube.

2. The construction method of a rectangular steel tube-constrained ultra-high-strength concrete column according to claim 1, characterized in that: The two end faces in the longitudinal direction of the ultra-high-strength concrete (2) are respectively flush with the two end faces of the steel pipe assembly (1).

3. The construction method of a rectangular steel tube-constrained ultra-high-strength concrete column according to claim 1, characterized in that: The ultra-high-strength concrete (2) has a compressive strength greater than or equal to 100 MPa and contains no coarse aggregate.

4. The construction method of a rectangular steel tube-constrained ultra-high-strength concrete column according to claim 1, characterized in that: Two rectangular steel sleeves (11) extend from both ends of the longitudinal steel bar (3), respectively, and the two rectangular steel sleeves (11) respectively play a supporting role for the longitudinal steel bar (3).

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