CN103031927A - SCS square concrete-filled steel tube pier column - Google Patents

Abstract

The invention discloses an SCS square steel pipe concrete pier column, which comprises a square steel pipe, a circular steel pipe set inside the square steel pipe, four stiffening rib groups respectively arranged on the four inner side walls of the square steel pipe and filled in the square steel pipe. The concrete structure formed by pouring concrete in the cavity between the steel pipe and the circular steel pipe; each stiffener plate group includes multiple longitudinal stiffeners arranged in parallel, and the multiple longitudinal stiffeners are aligned with the inner side of the square steel pipe where they are located. The walls are arranged vertically; the structure and size of all longitudinal stiffeners in the four stiffener plate groups are the same; square steel pipes and circular steel pipes are arranged coaxially; the transverse width of each longitudinal stiffener is smaller than that at the location where it is arranged The spacing between square steel pipes and round steel pipes. The invention has the advantages of simple structure, reasonable design, convenient construction, low construction cost, excellent mechanical performance and good use effect, and can effectively solve various problems existing in the existing square steel pipe concrete structure.

Description

A kind of SCS square steel tube concrete pier column

technical field

The invention relates to a supporting pier column, in particular to an SCS square steel pipe concrete pier column.

Background technique

Concrete filled steel pipe refers to the structure formed after the steel pipe is filled with concrete. The two materials of steel and concrete make up for each other's weaknesses and give full play to each other's strengths, so that the steel tube concrete has a high bearing capacity and excellent mechanical properties. Nowadays, CFST structures are more and more widely used in structures such as offshore platforms and long-span, heavy-duty, and light bridges, and the CFST structures used mainly have three cross-sectional forms: circular, square, and rectangular. However, the currently used concrete-filled steel tube structures generally have structural defects that limit the development and application of concrete-filled steel tube structures to a large extent.

Among them, the square concrete-filled steel tube structure has the following advantages: first, the square concrete-filled steel tube beam-column joint form is simple and easy to construct, especially in the frame structure, the advantages of this joint can be well utilized; second, the relative inertia of the section The moment is larger, the overall stability and anti-bending performance are better; third, it has good seismic performance and ductility. However, square steel tubes have poor restraint on the core concrete, are prone to local buckling, and use a large amount of steel and the structure is heavy, which limits the development and application of square steel tube concrete. In view of the above-mentioned defects and deficiencies in the square steel tube concrete structure, at present, methods such as setting stiffeners, steel bars, steel frames, and round steel tubes in the square steel tube are mainly used to improve.

To sum up, there are several common problems in today's square steel tube concrete columns: first, square steel tubes have a weak hoop effect on concrete, are prone to local buckling, and the integrity of the composite structure is not enough; second, square steel tube concrete columns The self-weight is too large, thereby limiting the structural size of the column; 3. The fire resistance of steel is poor.

Contents of the invention

The technical problem to be solved by the present invention is to provide an SCS square concrete filled steel pipe pier with simple structure, reasonable design, convenient construction, low construction cost, excellent mechanical properties and good use effect in view of the above-mentioned deficiencies in the prior art. The invention can effectively solve the problems existing in the existing square steel pipe concrete structure, such as self-heaviness, inconvenient construction, poor connection performance between the outer steel pipe and the inner concrete, and the small hoop effect of the outer steel pipe on the inner concrete.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a square SCS steel pipe concrete pier, which is characterized in that it includes a square steel pipe, a round steel pipe set inside the square steel pipe, four four The stiffened rib plate group on the inner wall and the concrete structure formed by pouring concrete in the cavity between the square steel pipe and the circular steel pipe; each of the stiffened rib plate groups includes multiple longitudinal stiffeners arranged in parallel Ribs, the laying direction of the multiple longitudinal stiffeners is consistent with the central axis direction of the square steel pipe and the circular steel pipe, and the multiple longitudinal stiffeners are arranged vertically to the inner side wall of the square steel pipe where they are located; the four The structure and size of all the longitudinal stiffeners in the stiffener plate groups are the same; the square steel pipes and circular steel pipes are arranged coaxially; The central axes of the circular steel pipe and the square steel pipe are in the same direction, and all the longitudinal stiffeners in the four stiffener plate groups are integrally connected with the concrete structure; the longitudinal stiffeners are elongated steel ribs plate, the outer wall of each longitudinal stiffener is fastened and fixed on the inner wall of the square steel pipe, and the transverse width of each longitudinal stiffener is smaller than the distance between the square steel pipe and the circular steel pipe at the position where it is laid. spacing; the longitudinal lengths of the square steel pipe, round steel pipe, and multiple PBL stiffeners are the same; and the bottom end of the square steel pipe and the bottom ends of the plurality of PBL stiffeners are all flush with the bottom end of the circular steel pipe.

The above-mentioned SCS square concrete-filled steel pipe pier is characterized in that: the middle part of the elongated steel rib plate is provided with a plurality of through holes from top to bottom, and the plurality of through holes are arranged on the same straight line.

The above-mentioned SCS square steel pipe concrete pier is characterized in that: the outer wall of each longitudinal stiffener and the inner wall of the square steel pipe are connected by welding.

The above-mentioned SCS square steel pipe concrete pier column is characterized in that: the four inner side walls of the square steel pipe include a left side wall and a right side wall symmetrically arranged on the left and right, and a front side wall and a rear side wall arranged symmetrically on the front and rear sides, The number of longitudinal stiffeners arranged on the front side wall and the rear side wall is N1, and the number of longitudinal stiffeners arranged on the left side wall and the right side wall is N2, wherein N1≥N2, the The transverse width L1 of the front side wall and the rear side wall ≥ the transverse width L2 of the left side wall and the right side wall, N1 and N2 are both positive integers and N2 ≥ 2; when the cross section of the square steel pipe is a square, N1=N2; when the cross section of the square steel pipe is rectangular, and L1>L2.

The above-mentioned SCS square concrete-filled steel pipe pier column is characterized in that: the number of through holes and the layout positions of each through hole are the same on all longitudinal stiffeners in the four stiffener plate groups; The holes are uniformly arranged from top to bottom, and the structures and sizes of the plurality of through holes are the same.

The above-mentioned SCS square steel pipe concrete pier is characterized in that: the concrete structure is a carbon fiber concrete structure.

The above-mentioned SCS square steel pipe concrete pier is characterized in that: the outer diameter of the circular steel pipe is Φ102mm-Φ2000mm, the wall thickness of the square steel pipe and the circular steel pipe are both 4mm-100mm, and A1:A2=1 : (0.6～0.8), where A1=a1+b1, a1 is the cross-sectional area of the square steel pipe and b1 is the cross-sectional area of the hollow part inside the square steel pipe, A2=π·r ² and r is the outer diameter of the circular steel pipe .

）。The above-mentioned SCS square steel pipe concrete pier is characterized in that: the transverse width of each longitudinal stiffener is equal to the distance between the square steel pipe and the circular steel pipe at the position where it is laid (

).

其中d3为所述圆形孔所处纵向加劲肋的横向宽度。The above-mentioned SCS square concrete-filled steel pipe pier is characterized in that: the through hole is a circular hole, and the aperture of the circular hole is

Wherein d3 is the transverse width of the longitudinal stiffener where the circular hole is located.

The above-mentioned SCS square steel pipe concrete pier is characterized in that: the cross-sectional area of the square steel pipe is preferably 4m ² to 10m ² and the wall thickness is preferably 18mm to 25mm, and the wall thickness of the circular steel pipe is preferably 18mm ～25mm; the transverse width of the elongated steel rib plate is preferably 100mm～250mm and its thickness is preferably 12mm～22mm; the diameter of the circular hole is preferably Φ30mm～Φ50mm, and two adjacent circles up and down The pitch of the shaped holes is preferably 100 mm to 200 mm.

Compared with the prior art, the present invention has the following advantages:

1. Simple structure, reasonable design and low construction cost.

2. The structure is light and the anti-seismic and torsional performance is good. At the same time, the use method is flexible, and it can be applied to structures such as pier columns, arch ribs, and beams.

3. The construction is convenient, the use effect is good, the mechanical properties are good, and the structure is light. The inner and outer steel pipes are connected by poured concrete to form a whole. In actual use, the invention can fully improve the defects of the square steel pipe concrete structure such as heavy weight and inconvenient construction. It uses the larger cross-sectional area of the square steel pipe to provide a larger cross-sectional torsional and bending moment of inertia, and uses the circular steel pipe to effectively reduce the The small concrete volume reduces its own weight, and the sandwich concrete is in a three-way compression state and connects the inner square steel pipes into a whole. Therefore, the present invention can give full play to the advantages of simple form and easy construction of the square steel tube concrete joint, the relative moment of inertia of the section is relatively large, the performance of earthquake resistance and torsion resistance is good, and the connection performance between the square steel tube and its internal concrete can be effectively overcome. Poor, the outer steel pipe has a small hoop effect on the inner concrete, etc., the present invention uses the built-in round steel pipe to enhance the hoop effect on the concrete, and uses the effective concrete volume of the round steel pipe to reduce the self-weight.

4. The concrete poured between the inner square steel pipes can be either ordinary concrete or carbon fiber concrete. Moreover, the content of carbon fiber added in the carbon fiber concrete used is about 0.6% by mass, which can increase the tensile strength and tensile ductility of the concrete by 30% and 25% respectively. Carbon fiber is made of carbon fiber filaments through chopped mechanical cutting. The length is generally in mm, and the shape is a certain length of velvet. High performance, and has the advantages of uniform dispersion, various feeding methods, and simple process. Adding an appropriate amount of chopped carbon fiber to the concrete can improve the tensile strength, strength and impact resistance of the concrete, reduce drying shrinkage, and improve wear resistance. This concrete is lighter than ordinary concrete and has certain heat insulation properties and shock absorption performance. Compared with the steel pipe concrete structure in which the interior of the circular steel pipe and the space formed between the circular steel pipe and the square steel pipe are all filled with concrete, the invention can make full use of the strength of the built-in circular steel pipe.

5. The out-of-plane stability of the square steel pipe is enhanced by using the opening stiffener, and the shear resistance of the structure is greatly enhanced accordingly, and at the same time, the various components of the entire steel pipe concrete structure are closely connected into a whole. Combined with multiple stirrups, the multiple open-hole stiffeners are organically connected as a whole, which further enhances the integrity of the entire CFST structure. The perforated stiffeners not only improve the compressive strength of the core concrete, but also enhance the stability of the pipe wall; at the same time, the perforated stiffeners act as shear members, connecting the steel pipe and concrete as a whole, improving the strength of steel and concrete. combination effect. Moreover, the present invention has strong operability, and can effectively solve the problem that the bending time of the steel pipe is not easy to control due to the relationship between the stiffness of the opening stiffener.

To sum up, the present invention has the advantages of simple structure, reasonable design, convenient construction, low construction cost, excellent mechanical properties, and good application effect, and can effectively solve the existing problems of the existing square steel tube concrete structure, such as heavy weight, inconvenient construction, and problems between the outer steel tube and its internal structure. There are many problems such as poor connection performance between concrete and small hoop effect of outer steel pipe on inner concrete.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the internal structure of the present invention.

Fig. 3 is a schematic diagram of the top structure of the present invention.

Explanation of reference signs:

1—square steel pipe; 2—round steel pipe; 3—PBL stiffener;

4—concrete structure; 5—through hole.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, the present invention comprises a square steel pipe 1, a circular steel pipe 2 set inside the square steel pipe 1, and four sets of stiffening ribs respectively arranged on the four inner walls of the square steel pipe 1 And a concrete structure 4 formed by pouring concrete filled in the cavity between the square steel pipe 1 and the circular steel pipe 2 . Each set of stiffening ribs includes a plurality of longitudinal stiffening ribs 3 arranged in parallel, and the arrangement directions of the plurality of longitudinal stiffening ribs 3 are consistent with the direction of the central axis of the square steel pipe 1 and the circular steel pipe 2, and more The longitudinal stiffeners 3 mentioned above are arranged vertically to the inner side wall of the square steel pipe 1 where they are located. All longitudinal stiffeners 3 in the four stiffener plate groups have the same structure and size. The square steel pipe 1 and the round steel pipe 2 are arranged coaxially; the arrangement direction of all the longitudinal stiffeners 3 in the four stiffening rib plate groups is consistent with the direction of the central axis of the round steel pipe 2 and the square steel pipe 1 , and all the longitudinal stiffeners 3 in the four stiffener groups are fastened together with the concrete structure 4; the longitudinal stiffeners 3 are elongated steel ribs, and each of the longitudinal stiffeners 3 The outer walls are fastened to the inner wall of the square steel pipe 1, and the transverse width of each longitudinal stiffener 3 is smaller than the distance between the square steel pipe 1 and the circular steel pipe 2 at the position where it is arranged. The longitudinal lengths of the square steel pipe 1, the round steel pipe 2 and the plurality of PBL stiffeners 3 are all the same. The top of the square steel pipe 1 and the tops of the plurality of PBL stiffeners 3 are flush with the top of the circular steel pipe 2, and the bottom of the square steel pipe 1 and the plurality of PBL stiffeners 3 The bottom ends of all are flush with the bottom ends of the circular steel pipes 2.

In this embodiment, a plurality of through holes 5 are opened from top to bottom in the middle of the elongated steel rib plate, and the plurality of through holes 5 are arranged on the same straight line.

During actual processing, the outer sidewall of each longitudinal stiffener 3 and the inner sidewall of the square steel pipe 1 are connected by welding.

In this embodiment, the four inner side walls of the square steel pipe 1 include a left side wall and a right side wall symmetrically arranged on the left and right, and a front side wall and a rear side wall arranged symmetrically on the front and rear sides. The number of longitudinal stiffeners 3 arranged on the wall is N1, and the number of longitudinal stiffeners 3 arranged on the left side wall and the right side wall is N2, wherein N1≥N2, the front side wall and the rear side The lateral width L1 of the wall ≥ the lateral width L2 of the left side wall and the right side wall, N1 and N2 are both positive integers and N2 ≥ 2; when the cross section of the square steel pipe 1 is a square, N1=N2; when When the cross section of the square steel pipe 1 is a rectangle, L1>L2.

In this embodiment, the number of through holes 5 and the layout positions of each through hole 5 are the same on all the longitudinal stiffeners 3 in the four stiffener plate groups. The plurality of through holes 5 are uniformly arranged from top to bottom, and the structures and sizes of the plurality of through holes 5 are the same.

In this embodiment, the concrete structure 4 is a carbon fiber concrete structure.

During actual processing, the outer diameter of the circular steel pipe 2 is Φ102mm-Φ2000mm, the wall thickness of the square steel pipe 1 and the circular steel pipe 2 are both 4mm-100mm, and A1:A2=1:(0.6-0.8), Wherein A1=a1+b1, a1 is the cross-sectional area of the square steel pipe 1 and b1 is the cross-sectional area of the hollow part inside the square steel pipe 1, A2=π r ² and r is the outer diameter of the circular steel pipe 2.

The transverse width of each longitudinal stiffener 3 is equal to the distance between the square steel pipe 1 and the circular steel pipe 2 at the position where it is arranged.

其中d3为所述圆形孔所处纵向加劲肋3的横向宽度。In this embodiment, the through hole 5 is a circular hole, and the diameter of the circular hole is

Wherein d3 is the transverse width of the longitudinal stiffener 3 where the circular hole is located.

In this embodiment, A1=D ² and it is preferably 4m ² ~ 10m ² , = 6m ² , wherein D is the length of the outer side wall of the square steel pipe 1, and the wall thickness of the square steel pipe 1 is preferably 18mm ~ 25mm . The transverse width of the elongated steel ribs is preferably 100 mm to 250 mm and the thickness is preferably 12 mm to 22 mm; the diameter of the circular hole is preferably Φ30 mm to 50 mm, and two circular holes adjacent to each other up and down The pitch is preferably 100 mm to 200 mm.

During actual processing, the multiple longitudinal stiffeners 3 in each stiffener plate group are evenly arranged. In this embodiment, the number of longitudinal stiffeners 3 included in each set of stiffener plates is preferably 1-4.

During actual construction, when the constructed steel pipe concrete piers are used in fields such as building construction and bridges, the wall thicknesses of the circular steel pipes 2 and square steel pipes 1 are preferably adjusted accordingly within the range of 4 mm to 66 mm. When the constructed steel pipe concrete piers are used on offshore platforms, the wall thicknesses of the circular steel pipes 2 and square steel pipes 1 are preferably adjusted accordingly within the range of 12 mm to 100 mm.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technical aspects of the present invention. within the scope of protection of the scheme.

Claims (10)

1. SCS rectangular steel tube performance of concrete column confined is characterized in that: comprise rectangular steel tube (1), be set in the inner round steel pipe (2) of rectangular steel tube (1), the floor group and by the concrete structure (4) that is filled in the interior concreting moulding of cavity between rectangular steel tube (1) and the round steel pipe (2) of putting more energy on four four inside walls that are laid in respectively rectangular steel tube (1); Each described floor group of putting more energy into includes the longitudinal stiffener (3) that multiple tracks is parallel laying, the cloth set direction of the described longitudinal stiffener of multiple tracks (3) all central axial direction with rectangular steel tube (1) and round steel pipe (2) is consistent, and the described longitudinal stiffener of multiple tracks (3) all is vertical laying with the inside wall of its rectangular steel tube of living in (1); The structure of all longitudinal stiffeners (3) in four described floor groups of putting more energy into is all identical with size; Described rectangular steel tube (1) and round steel pipe (2) are coaxial laying; All the central axial direction with described round steel pipe (2) and rectangular steel tube (1) is consistent for the cloth set direction of all longitudinal stiffeners (3) in four described floor groups of putting more energy into, and all longitudinal stiffeners (3) in four described floor groups of putting more energy into all are fastenedly connected with concrete structure (4) and are integrated; Described longitudinal stiffener (3) is strip steel floor, every together described longitudinal stiffener (3) lateral wall is all on the fastening inside wall that is fixed on rectangular steel tube (1), and the transverse width of every together described longitudinal stiffener (3) is all less than the spacing between its installation position prescription shape steel pipe (1) and the round steel pipe (2); Described rectangular steel tube (1), round steel pipe (2) are all identical with the longitudinal length of the described PBL stiffening rib of multiple tracks (3); The top of the top of described rectangular steel tube (1) and the described PBL stiffening rib of multiple tracks (3) is all mutually concordant with the top of described round steel pipe (2), and the bottom of the bottom of described rectangular steel tube (1) and the described PBL stiffening rib of multiple tracks (3) is all mutually concordant with the bottom of described round steel pipe (2).

2. according to a kind of SCS rectangular steel tube performance of concrete column confined claimed in claim 1, it is characterized in that: the middle part of described strip steel floor has a plurality of through holes (5) from top to bottom, and a plurality of described through hole (5) is laid on the same straight line.

3. according to claim 1 or 2 described a kind of SCS rectangular steel tube performance of concrete column confineds, it is characterized in that: all be connected with welding manner between the lateral wall of every together described longitudinal stiffener (3) and the inside wall of rectangular steel tube (1).

4. according to claim 1 or 2 described a kind of SCS rectangular steel tube performance of concrete column confineds, it is characterized in that: four inside walls of described rectangular steel tube (1) comprise left side wall and the right side wall that is the bilateral symmetry laying and are symmetrical front side wall and the rear wall of laying in front and back, on described front side wall and the rear wall the quantity of the longitudinal stiffener of laying (3) be N1, and on described left side wall and the right side wall the quantity of the longitudinal stiffener of laying (3) be N2, N1 〉=N2 wherein, the transverse width L2 of the transverse width L1 of described front side wall and rear wall 〉=described left side wall and right side wall, N1 and N2 are positive integer and N2 〉=2; When the cross section of described rectangular steel tube (1) is square, N1=N2; When the cross section of described rectangular steel tube (1) is rectangle, and L1＞L2.

5. according to a kind of SCS rectangular steel tube performance of concrete column confined claimed in claim 2, it is characterized in that: on all longitudinal stiffeners (3) in four described floor groups of putting more energy into the quantity of the through hole of offering (5) all identical with the installation position of each through hole (5); A plurality of described through holes (5) are even laying from top to bottom, and the structure of a plurality of described through hole (5) is all identical with size.

6. according to claim 1 or 2 described a kind of SCS rectangular steel tube performance of concrete column confineds, it is characterized in that: described concrete structure (4) is carbon fiber reinforced concrete.

7. according to claim 1 or 2 described a kind of SCS rectangular steel tube performance of concrete column confineds, it is characterized in that: the external diameter of described round steel pipe (2) is Φ 102mm～Φ 2000mm, the wall thickness of described rectangular steel tube (1) and round steel pipe (2) is 4mm～100mm, and A1 ︰ A2=1 ︰ (0.6～0.8), A1=a1+b1 wherein, a1 is that cross-sectional area and the b1 of rectangular steel tube (1) is the cross-sectional area of the inboard hollow bulb of rectangular steel tube (1), A2=π r ²And r is the external diameter of round steel pipe (2).

8. according to a kind of SCS rectangular steel tube performance of concrete column confined claimed in claim 2, it is characterized in that: every together transverse width of described longitudinal stiffener (3) is spacing between its installation position prescription shape steel pipe (1) and the round steel pipe (2)

9. according to a kind of SCS rectangular steel tube performance of concrete column confined claimed in claim 2, it is characterized in that: described through hole (5) is circular port, and the aperture of described circular port

Wherein d3 is the transverse width of described circular port longitudinal stiffener of living in (3).

10. according to a kind of SCS rectangular steel tube performance of concrete column confined claimed in claim 7, it is characterized in that: the cross-sectional area of described rectangular steel tube (1) is preferably 4m ²～10m ²And its wall thickness is preferably 18mm～25mm, and the wall thickness of described round steel pipe (2) is preferably 18mm～25mm; The transverse width of described strip steel floor is preferably 100mm～250mm and its thickness is preferably 12mm～22mm; The diameter of described circular port is preferably 30mm～Φ 50mm, and the spacing of neighbouring two described circular ports is preferably 100mm～200mm.

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