CN206467902U - A kind of fiber steel pipe concrete structure with relief groove - Google Patents

Abstract

A fiber-steel composite tubular concrete structure with decompression grooves is characterized in that the structure is composed of steel pipes (1), interface layer (2), core concrete (3), decompression grooves (4), fiber reinforced composite materials ( 5) Composition, the steel plate (8) is punched out of the decompression groove (4), and the steel plate (8) with one or more than one decompression groove (4) is rolled and welded into the steel pipe (1) along the side l direction, and the Filling strips (41) are embedded in the decompression groove (4), and one or more layers of resin-impregnated fiber-reinforced composite materials (5) are bonded by hand lay-up lamination process or winding process to form a fiber-steel composite material after curing. pipe (6), erecting the fiber-steel composite pipe (6) in the foundation, uniformly coating the interface layer (2) on the inner surface of the steel pipe (1), pouring core concrete (3) inside the steel pipe (1), and curing . The utility model stamps out one or more spaced decompression grooves on the steel plate at one time through the prefabricated stamping die system, and further bonds fiber-reinforced composite materials on the outer surface of the steel pipe to further strengthen the constraint on the core concrete and provide Corrosion protection. The utility model is suitable for piles, columns, bridge piers and other structural components mainly subject to vertical loads in newly built structures.

Description

A Fiber-Steel Composite Tube Concrete Structure with Decompression Groove

technical field

The utility model relates to a fiber-steel composite tubular concrete structure with a decompression groove, which is applied to column structures of various bridges and buildings, and belongs to the field of civil engineering.

Background technique

Fiber reinforced composite (FRP) is composed of fiber material and resin matrix, which has strong corrosion resistance, and also has the advantages of light weight, high strength, and convenient molding. It can be combined with traditional materials (concrete, steel, wood, etc.) Common force through reasonable combination.

The concrete-filled steel tube structure has high strength and good plasticity, which is mainly due to the constraint effect of the external steel tube on the deformation of the core concrete. However, the steel pipes of CFST columns not only need to restrain the concrete, but also bear the vertical pressure. The existence of the vertical pressure reduces the restraint ability that the steel pipes can provide to the concrete structure.

Traditional steel tube concrete structures tend to strengthen the integrity of steel tubes and concrete, such as enhancing the bond between steel tubes and core concrete through shear nails or welding threaded steel bars inside steel tubes to improve the bond between steel tubes and concrete. These technologies make steel tubes More emphasis is placed on the role of vertical bearing, rather than the role of hoop restraint.

The steel jacketed concrete structure is to cut off or open holes at the end of the steel pipe to form a weak section to reduce the vertical pressure on the steel pipe. The difficulty of construction directly affects the application effect of the project, and simply opening holes on the surface of the steel pipe will still bear a large vertical stress due to the bonding and friction between the steel pipe and the core concrete, and the steel pipe at the groove will undoubtedly Early buckling, forming the weak side. For this reason, such as Chinese Patent No. "201220153717.6", discloses a "groove-cut steel casing concrete column", which is processed after a plurality of circular or spiral grooves are processed on the outer wall of the steel pipe of the steel tube concrete column. A pressure-bearing structural member is formed, but the structure is to strengthen the constraint on the core concrete by cutting grooves on the outer wall of the steel pipe, and the local constraints of the steel pipe at the cut groove will also become smaller, and the steel pipe groove is difficult to process It is too large to be molded at one time, resulting in high cost and low processing efficiency, which is not suitable for engineering practice.

In order to overcome the above-mentioned shortcomings, the utility model proposes a fiber-steel composite tubular concrete structure with a decompression groove, which makes full use of the good ductility of the steel tube, and punches out a strip or More than one decompression groove arranged at intervals, and fiber-reinforced composite materials are further bonded on the outer surface of the steel pipe to further strengthen the constraint on the core concrete and provide corrosion-resistant protection.

Contents of the invention

The purpose of this utility model is to provide a fiber-steel composite tubular concrete structure with decompression grooves. Through the innovation of construction technology, one or more decompression grooves arranged at intervals with a depth smaller than the thickness of the steel plate can be punched out at one time. , improve work efficiency, reduce construction cost, and can be used as a formwork for pouring concrete; through structural innovation, the lateral expansion restraint of fiber-steel composite pipes on core concrete is improved, and the overall bearing capacity of components is improved.

The technical scheme of the utility model is: a fiber-steel composite tubular concrete structure with a decompression groove, which is characterized in that the structure is composed of a steel pipe, an interface layer, a core concrete, a decompression groove, and a fiber-reinforced composite material, and the steel plate is stamped Out of the decompression groove, the angle between the decompression groove and the side of the steel plate in the l direction is 0-60°, the depth of the decompression groove is greater than 80% of the thickness of the steel plate and less than the thickness of the steel plate, the steel plate with one or more than one decompression groove along the The side is rolled and welded into a steel pipe in the l direction, and the pressure relief groove is recessed toward the inside of the steel pipe. Filling strips are embedded in the pressure relief groove, and the filling strip fills the pressure relief groove. The outer surface is flush with the outer surface of the steel pipe. Hand lay-up is used. Process or winding process to bond one or more layers of resin-impregnated fiber-reinforced composite materials, and form a fiber-steel composite pipe after curing. Stand the fiber-steel composite pipe in the foundation, and clean the inner surface of the steel pipe. Spread the interface layer evenly on the inner surface of the steel pipe, pour the core concrete inside the steel pipe, and maintain and form it.

On implementation method, the utility model comprises the following steps:

1) The stamping die system is prefabricated, including the lower die and the upper punch, the lower die is used as the bottom plate support during stamping, the upper punch is used as the stamping die, and the lower die is provided with one or more recesses arranged at intervals. The notch of the notch faces upward, and the upper punch is arranged with one or more convex ribs corresponding to the position, size and quantity of the concave notch of the lower die;

2) Place the steel plate horizontally on the upper surface of the lower die, and then place the upper punch on the upper part of the steel plate, with its convex ribs facing down, corresponding to the concave notch of the lower die, and the stamping machine exerts force on the upper convex On the upper surface of the mold, the steel plate is punched out of the decompression groove, the angle between the decompression groove and the side of the steel plate in the l direction is 0-60°, and the depth of the decompression groove is greater than 80% of the thickness of the steel plate and less than the thickness of the steel plate;

3) Rolling and welding the steel plate with one or more decompression grooves along the side l direction to form a steel pipe, and the decompression groove is sunken towards the inside of the steel pipe;

4) Embed a filling strip in the decompression groove, the filling strip fills the decompression groove, and the outer surface is flush with the outer surface of the steel pipe;

5) Clean the surface of the steel pipe, and bond one or more layers of resin-impregnated fiber-reinforced composite material by hand lay-up lamination process or winding process, and form a fiber-steel composite pipe after curing;

6) Stand the fiber-steel composite pipe in the foundation, clean the inner surface of the steel pipe, and evenly smear the interface layer on the inner surface of the steel pipe;

7) Core concrete is poured inside the steel pipe and cured to form a fiber-steel composite pipe-concrete structure with decompression grooves.

The sum of the width c of the decompression grooves is not less than 2% of the length of the member, and one or more decompression grooves are arranged at intervals on the surface of the steel pipe, and more than one decompression grooves are parallel to each other. One of trapezoidal, rectangular, U-shaped, and semicircular.

The interface layer adopts one of lubricating oil, polytetrafluoroethylene, paraffin, asphalt and asphalt mortar.

The filling strip is one of rubber, asphalt mortar, and fiber-reinforced plastic.

The fiber-reinforced composite material is formed by one or more of glass fibers, carbon fibers, aramid fibers, and basalt fibers mixed together, and the angle between the fiber direction and the component axis direction is between 0° and 90°.

The cross-sectional form of the structure is one of a circle, an ellipse, a square, a rectangle, and an equilateral polygon with sides greater than or equal to 5. The corners of the cross-section can be transformed into chamfers, and the chamfer radius R is greater than or equal to 25mm. .

The position, size and quantity of the convex ribs and the concave notch are consistent with the position, size and quantity of the decompression groove.

The core concrete should be self-compacting micro-expansion concrete with an expansion ratio of 0.01% to 0.04%.

In the fiber-steel composite tubular concrete structure with decompression grooves of the utility model, one or more decompression grooves arranged at intervals can be punched out on the steel plate at one time through the prefabricated stamping die system, which simplifies the processing The process improves the processing efficiency, and because the stamping die system can be reused many times, the project cost is reduced; because the stamping process is used instead of the cutting process to form the decompression groove, the formation of the decompression groove does not weaken the steel pipe at the position of the decompression groove material that does not reduce the effect of hoop confinement at the relief groove. Since the depth of the controlled decompression groove is smaller than the thickness of the steel pipe, the steel pipe is not broken at the decompression groove, so there will be no grout leakage during construction, and it can be directly used as a formwork for prefabricated concrete components on the construction site; the decompression grooves arranged at intervals are separated The vertical load is transmitted vertically on the steel pipe, and at the same time, the interface layer is applied on the inner surface of the steel pipe, so that the bonding and friction between the steel pipe and the core concrete are greatly reduced, further avoiding or reducing the vertical load on the steel pipe ; The filling strip embedded in the relief groove is a unidirectional material, which will not transmit vertical stress. In a fiber-steel composite tubular concrete structure with decompression grooves of the present invention, the sum of the width c of the decompression grooves is not less than 2% of the component length, so as to provide sufficient vertical deformation space for the components during the compression process; Fiber-reinforced composites are bonded to the outer surface of the steel tubes to further strengthen the confinement of the core concrete and provide corrosion protection.

The utility model is suitable for piles, columns, bridge piers and other structural components mainly subject to vertical loads in newly built structures.

Compared with the prior art, the utility model has the following advantages:

(1) The processing technology is simple, the efficiency is high, and the construction cost is low.

(2) The vertical force of the restrained material is eliminated, and the premature local buckling of the composite pipe is avoided.

(3) The material has high performance efficiency, high structural bearing capacity and good ductility.

(4) The comprehensive performance of the combination of steel, composite materials and concrete has been brought into full play to the greatest extent.

Description of drawings:

Fig. 1 is a process flow diagram of a fiber-steel composite tubular concrete structure manufacturing method with a decompression groove;

Fig. 2 is a schematic diagram of a steel plate to be stamped for a decompression groove;

Fig. 3 is a schematic diagram of a stamping die system;

Fig. 4 is a schematic diagram of making a decompression groove by stamping a steel plate with a stamping die system;

Fig. 5A is a schematic diagram of a horizontal decompression groove steel plate with more than one spaced arrangement;

Fig. 5B is a schematic diagram of inclined relief tank steel plates with more than one spaced arrangement;

Fig. 6A is a schematic diagram of a horizontal decompression groove steel pipe with a circular cross-section arranged at more than one interval;

Fig. 6B is a schematic diagram of a steel pipe with a circular cross-section having more than one inclined decompression groove arranged at intervals;

Fig. 7 is a schematic diagram of a longitudinal section of a steel pipe with a relief groove after embedding a filling strip in the relief groove;

Fig. 8 is a longitudinal sectional view of a fiber-steel composite pipe with decompression grooves formed by bonding fiber-reinforced composite materials outside the steel pipe;

Fig. 9 is a schematic diagram of a vertical section of a fiber-steel composite pipe with decompression grooves standing on the foundation and smearing the interface layer;

Figure 10 is a schematic diagram of pouring core concrete and curing molding;

Fig. 11A is a partial schematic diagram of a rectangular cross-section decompression tank;

Fig. 11B is a partial schematic diagram of an inverted trapezoidal section decompression groove;

Fig. 11C is a partial schematic diagram of a U-shaped section decompression groove;

Figure 11D is a partial schematic diagram of a semi-circular section decompression groove;

Fig. 12 is a cross-sectional schematic diagram of a fiber-steel composite tubular concrete structure with a decompression groove of a circular section;

Fig. 13 is a schematic cross-sectional view of a fiber-steel composite tubular concrete structure with a decompression groove of an elliptical cross section;

Fig. 14 is a cross-sectional schematic diagram of a fiber-steel composite tubular concrete structure with a decompression groove in a square section with rounded corners;

Fig. 15 is a schematic cross-sectional view of a fiber-steel composite tubular concrete structure with a decompression groove in a rectangular section with rounded corners;

Fig. 16 is a schematic cross-sectional view of a fiber-steel composite tubular concrete structure with a decompression groove of a circular end-shaped section;

Fig. 17 is a schematic cross-sectional view of a fiber-steel composite tubular concrete structure with a decompression groove in a polygonal section with rounded corners.

In accompanying drawings 1 to 17, 1 is steel pipe; 2 is interface layer; 3 is core concrete; 4 is decompression tank; 5 is fiber-reinforced composite material; 6 is fiber-steel composite pipe; 7 is stamping die system ; 8 is a steel plate; 41 is a filling strip; 71 is a lower die; 72 is an upper punch; 711 is a concave notch; 721 is a convex rib.

detailed description:

In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation of the utility model is now described with reference to the accompanying drawings. The utility model provides a fiber-steel composite tubular concrete structure with a decompression groove, which is characterized in that the structure is composed of a steel pipe 1, an interface layer 2, a core concrete 3, a decompression groove 4, and a fiber-reinforced composite material 5, and the steel plate 8. Punch out the decompression groove 4. The angle between the decompression groove 4 and the side l direction of the steel plate 8 is 0-60°. The depth of the decompression groove 4 is greater than 80% of the thickness of the steel plate 8 and less than the thickness of the steel plate 8. There will be one or The steel plate 8 of more than one decompression groove 4 is rolled and welded into the steel pipe 1 along the side l direction, the decompression groove 4 is sunken toward the inside of the steel pipe 1, and a filling strip 41 is embedded in the decompression groove 4, and the filling strip 41 fills the decompression groove 4. The outer surface is flush with the outer surface of the steel pipe 1, and one or more layers of resin-impregnated fiber-reinforced composite material 5 are bonded by hand lay-up lamination process or winding process, and the fiber-steel composite pipe 6 is formed after curing. Stand the fiber-steel composite pipe 6 on the foundation, clean the inner surface of the steel pipe 1, apply the interface layer 2 evenly on the inner surface of the steel pipe 1, pour the core concrete 3 inside the steel pipe 1, and maintain and form it.

On implementation method, the utility model comprises the following steps:

1) Prefabricate stamping die system 7, as shown in Figure 3, comprise lower die 71 and upper punch 72, lower die 71 is used as base plate support during stamping, upper punch 72 is as stamping die, and lower die 71 is provided with One or more recessed notches 711 arranged at intervals, the notches of the recessed notches 711 face upwards, and the upper punch 72 is arranged with one or one strip corresponding to the position, size and number of the recessed notches 711 of the lower die 71. The above convex ribs 721;

2) Place the steel plate 8 horizontally on the upper surface of the lower die 71, then place the upper punch 72 on the upper part of the steel plate 8, with the convex ribs 721 facing downward, corresponding to the recessed notches 711 of the lower die 71, As shown in Figure 4, the stamping machine exerts force on the upper surface of the upper punch 72 to punch the steel plate 8 out of the decompression groove 4, and the angle between the decompression groove 4 and the side l direction of the steel plate 8 is 0-60°. When the angle between the pressure groove 4 and the side l direction of the steel plate 8 is 0°, as shown in Figure 5A, when the angle between the decompression groove 4 and the side l direction of the steel plate 8 is 30°, as shown in Figure 5B; The depth of the decompression groove 4 is greater than 80% of the thickness of the steel plate 8 and less than the thickness of the steel plate 8;

3) Rolling and welding the steel plate 8 with one or more decompression grooves 4 along the direction of side l to form a steel pipe 1, and the decompression groove 4 is sunken toward the inside of the steel pipe 1;

4) Embedding a filling strip 41 in the decompression groove 4, the filling strip 41 is filled with the decompression groove 4, and the outer surface is flush with the outer surface of the steel pipe 1;

5) Clean the surface of the steel pipe 1, and bond one or more layers of resin-impregnated fiber-reinforced composite material 5 by hand lay-up lamination process or winding process, and form a fiber-steel composite pipe 6 after curing;

6) Stand the fiber-steel composite pipe 6 on the foundation, clean the inner surface of the steel pipe 1, and evenly apply the interface layer 2 on the inner surface of the steel pipe 1;

7) The core concrete 3 is poured inside the steel pipe 1 and cured to form a fiber-steel composite pipe-concrete structure with a decompression groove.

The sum of the widths c of the decompression grooves 4 is not less than 2% of the length of the component, and one or more decompression grooves 4 are arranged on the surface of the steel pipe 1 at intervals, and the more than one decompression grooves 4 are parallel to each other, and the arrangement spacing s should be uniform. The cross-sectional form is one of inverted trapezoidal, rectangular, U-shaped and semicircular.

The interface layer 2 adopts one of lubricating oil, polytetrafluoroethylene, paraffin, asphalt, and asphalt mortar.

The filling strip 41 is one of rubber, asphalt mortar, and fiber-reinforced plastic.

The fiber-reinforced composite material 5 is made of glass fiber, carbon fiber, aramid fiber, basalt fiber or a mixture of several of them, and the angle between the fiber direction and the component axis direction is between 0° and 90°.

The cross-sectional form of the structure is one of a circle, an ellipse, a square, a rectangle, and an equilateral polygon with sides greater than or equal to 5. The corners of the cross-section can be transformed into chamfers, and the chamfer radius R is greater than or equal to 25mm. .

The position, size and quantity of the convex ribs 721 and the recessed notches 711 are consistent with the position, size and quantity of the decompression groove 4 .

The core concrete 3 should be self-compacting micro-expansion concrete with an expansion ratio of 0.01% to 0.04%.

Figures 12 to 17 are fiber-steel composite tubular concrete structures with decompression grooves with circular cross-section, oval cross-section, rounded square cross-section, rounded rectangular cross-section, rounded end-shaped cross-section, and rounded polygonal cross-section respectively. Cross-sectional diagram.

Claims (7)

1. A fiber-steel composite tubular concrete structure with decompression groove, characterized in that the structure is composed of steel pipe (1), interface layer (2), core concrete (3), decompression groove (4), fiber reinforced composite The material (5) consists of stamping a steel plate (8) out of a decompression groove (4), the angle between the decompression groove (4) and the side l direction of the steel plate (8) is 0-60°, and the decompression groove (4) The depth is greater than 80% of the thickness of the steel plate (8) and less than the thickness of the steel plate (8), and the steel plate (8) with one or more decompression grooves (4) is rolled and welded into a steel pipe (1) along the side l direction, reducing The pressure groove (4) is sunken towards the inside of the steel pipe (1), and a filling strip (41) is embedded in the pressure relief groove (4), and the filling strip (41) is filled with the pressure relief groove (4), and the outer surface and the steel pipe (1) The outer surface is flush, and one or more layers of fiber-reinforced composite material (5) impregnated with resin is bonded by hand lay-up lamination process or winding process, and the fiber-steel composite pipe (6) is formed after curing, and the fiber-steel The composite pipe (6) stands on the foundation, and the inner surface of the steel pipe (1) is cleaned, the interface layer (2) is evenly applied on the inner surface of the steel pipe (1), and the core concrete (3) is poured inside the steel pipe (1) , Conservation molding. 2. A fiber-steel composite tubular concrete structure with decompression grooves according to claim 1, the sum of the width c of the decompression grooves (4) is not less than 2% of the component length, and one or more The pressure grooves (4) are arranged on the surface of the steel pipe (1) at intervals, and more than one pressure relief groove (4) is parallel to each other, and the arrangement spacing s should be uniform, and its cross-sectional form is one of inverted trapezoidal, rectangular, U-shaped, and semicircular. . 3. A kind of fiber-steel composite tubular concrete structure with decompression groove according to claim 1, described interface layer (2) adopts one of lubricating oil, polytetrafluoroethylene, paraffin, asphalt, asphalt mortar kind. 4. A fiber-steel composite tubular concrete structure with a decompression groove according to claim 1, wherein the filling strip (41) is one of rubber, asphalt mortar, and fiber-reinforced plastic. 5. A fiber-steel composite tubular concrete structure with decompression grooves according to claim 1, wherein said fiber-reinforced composite material (5) is one or more of glass fibers, carbon fibers, aramid fibers, and basalt fibers Several of them are mixed, and the angle between the fiber direction and the axis direction of the component is between 0° and 90°. 6. A fiber-steel composite tubular concrete structure with decompression grooves according to claim 1, its cross-sectional form is one of circular, elliptical, square, rectangular, equilateral polygons with sides greater than or equal to 5 Type, the corners of its cross-section can be used as a chamfering transformation, and the chamfering radius R is greater than or equal to 25mm. 7. A fiber-steel composite tubular concrete structure with decompression grooves according to claim 1, wherein the core concrete (3) should be self-compacting micro-expansion concrete with an expansion ratio of 0.01% to 0.04%.