Shear key steel structure for reinforcing steel bar dense joints

Abstract

The shear key steel structure comprises a steel column, a column foot base frame, foundation bolts, shear keys, a sleeve and a column foot base, the column foot base frame is installed in the column foot base through the foundation bolts, the steel column is installed on the column foot base frame, the multiple shear keys are arranged at the bottom of the column foot base frame, and the sleeve is installed on the column foot base frame. And the shear key is inserted into the column foot foundation and is sleeved with a sleeve. The beam-column joint reinforcement cage has the beneficial effects that the steel bars serving as shear keys and the sleeves serving as the pre-buried grooves can be subjected to proper position selection according to the distribution of the steel bars at the mounting positions of the column feet, so that the cost is not increased, and the strength of the beam-column joint reinforcement cage is not reduced; the problem that in the prior art, shear keys are prone to conflicting with dense steel bar nodes is solved, the structure is simple, operation is easy, and reliability is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building steel structure, and particularly relates to a shear key steel structure for a steel bar dense joint. BACKGROUND

[0002] Welding a shear key on a column foot is a common way to resist horizontal shear force, and the shear key can effectively improve the shear bearing capacity and greatly reduce the ultimate displacement, and is suitable for various lateral displacement sensitive structures.

[0003] In the prior art, the column foot shear key is generally an angle steel, channel steel or I-beam type steel welded on the bottom plate of the column foot, which makes the shear key possibly collide with the steel bar and cannot be embedded; meanwhile, when a shear key groove is arranged by using a pre-buried groove method, the wooden box or steel box for pre-buried is easily interfered by the steel bar; and the post-slotting method has the risk of damaging important steel bars.

[0004] In view of the above problems, the present application provides a shear key steel structure for a steel bar dense joint, which realizes convenient installation of a column foot with a shear key at a steel bar dense joint, and has the advantages of simple structure, easy operation and good reliability.

[0005] Therefore, it is necessary to provide a shear key steel structure for a steel bar dense joint in view of the above technical problems. SUMMARY

[0006] In view of the above problems in the prior art, the present application aims to provide a shear key steel structure for a steel bar dense joint to solve the above problems.

[0007] The shear key steel structure for the steel bar dense joint comprises a steel column, a column foot base frame, a foundation bolt, a shear key, a sleeve pipe and a column foot foundation, the column foot base frame is installed in the column foot foundation through the foundation bolt, the steel column is installed on the column foot base frame, the bottom of the column foot base frame is provided with a plurality of shear keys, and the shear keys are inserted into the column foot foundation and sleeved with the sleeve pipe.

[0008] Preferably, the column foot base frame comprises a first bottom plate and a second bottom plate, and a plurality of rib plates in a ring shape are arranged between the first bottom plate and the second bottom plate.

[0009] Preferably, one side edge of the rib plate is welded with the steel column.

[0010] Preferably, the upper part of the foundation bolt is connected with the first bottom plate through a bolt and a gasket, and the lower part of the foundation bolt is bent.

[0011] Preferably, the first bottom plate and the second bottom plate are provided with a plurality of perforations in a radial distribution at the gap between two adjacent rib plates, and the number of the perforations is preferably 16.

[0012] Preferably, the column base comprises steel beams, steel reinforcement cages and concrete pouring.

[0013] Preferably, the sleeve is embedded in the gap of the steel reinforcement cage before pouring the column base, and the inner diameter of the sleeve is slightly larger than the diameter of the shear key so as to facilitate the embedding of the shear key; when the strength of the column base concrete reaches more than 70% of the design value, the part of the sleeve above the surface of the column base is cut off.

[0014] Preferably, a grouting layer is poured between the second bottom plate and the column base, and a column protection layer is poured on the upper part of the grouting layer, and the column protection layer is a concrete layer.

[0015] Preferably, the lower end of the shear key of the concrete layer is connected with a reinforcing block.

[0016] Preferably, the sleeve is made of alloy structural steel material.

[0017] Compared with the prior art, the present application has the beneficial effects that: the steel bar as the shear key and the sleeve as the pre-embedded groove can be selected at a suitable position according to the steel reinforcement distribution of the column installation position, and the problem that the shear key is prone to conflict with the denser steel reinforcement node in the prior art is solved without increasing the cost and reducing the strength of the beam-column joint steel reinforcement cage, and the structure is simple, easy to operate and good in reliability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a front view of the present application; Figure 2 is a top view of the present application; Figure 3 is a schematic view of the ribbed plate of the present application; Figure 4 is a schematic view of the anchor bolt of the present application; Figure 5 is a schematic view of the combination of the shear key and the sleeve of the present application; Figure 6 is a structural view of the column base frame of the present application.

[0019] In the drawings, the reference signs are as follows: 1, steel column; 2, column protection layer; 3, column base frame; 4, ribbed plate; 5, gasket; 6, anchor bolt; 7, shear key; 8, column base; 81, steel beam; 9, steel reinforcement cage; 10, grouting layer; 11, sleeve; 12, bolt; 13, reinforcing block; 14, first bottom plate; 15, second bottom plate. DETAILED DESCRIPTION

[0020] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0024] like Figure 1 and combined Figures 2 to 6 As shown, a shear key steel structure for a densely reinforced steel node includes a steel column 1, a column base frame 3, anchor bolts 6, shear keys 7, sleeves 11 and a column base foundation 8. The column base frame 3 is installed in the column base foundation 8 through the anchor bolts 6, and the steel column 1 is installed on the column base frame 3. Several shear keys 7 are provided at the bottom of the column base frame 3. The shear keys 7 are inserted into the column base foundation 8 and are covered with sleeves 11.

[0025] Furthermore, the column base frame 3 includes a first base plate 14 and a second base plate 15, and a plurality of annularly distributed ribs 4 are provided between the first base plate 14 and the second base plate 15. This enhances the rigidity of the column base plate 3 and ensures a stable and reliable connection between the column base plate 3 and the steel column 1.

[0026] Furthermore, one side of the rib plate 4 is welded to the steel column 1 .

[0027] Further, the upper part of the anchor bolt 6 is connected with the first bottom plate 14 through the bolt 12 and the gasket 5, and the lower part of the anchor bolt 6 is arranged in a bent mode. The tensile capacity of the column foot is improved under the premise of ensuring the structural performance of the column foot bottom plate 3.

[0028] Further, the first bottom plate 14 and the second bottom plate 15 are provided with radially distributed perforations at the gap between two adjacent rib plates 4, and the number of the perforations is preferably 16.

[0029] Further, the column foot foundation 8 comprises a steel beam 81, a steel reinforcement cage 9 and concrete.

[0030] Further, the sleeve 11 is embedded in the gap of the steel reinforcement cage 9 before pouring the column foot foundation 8, and the inner diameter of the sleeve 11 is slightly larger than the diameter of the shear key 7 so as to facilitate the embedding of the shear key 7; when the concrete strength of the column foot foundation 8 reaches more than 70% of the design value, the part of the sleeve 11 which is higher than the surface of the column foot foundation 8 is cut off.

[0031] Further, the grouting layer 10 is poured between the second bottom plate 15 and the column foot foundation 8, and the column foot protection layer 2 which is a concrete layer is poured on the upper part of the grouting layer 10. The column foot protection layer 2 plays a protective and anti-rust role.

[0032] Further, the lower end of the shear key 7 of the concrete layer is connected with the reinforcing pier 13. The reinforcing pier 13 can further improve the shear performance of the shear key 7.

[0033] Further, the sleeve 11 is made of alloy structural steel material, and the alloy structural steel has high strength and corrosion resistance.

[0034] Compared with the prior art, the present application has the beneficial effects that: the steel bar as the shear key 7 and the sleeve 11 as the embedded groove can be appropriately selected according to the steel reinforcement distribution of the column foot installation position, the problem that the shear key 7 is prone to conflict with the dense steel reinforcement node in the prior art is solved under the premise of not increasing the cost and reducing the strength of the beam-column joint steel reinforcement cage 9, and the structure is simple, easy to operate and has good reliability.

[0035] Working principle: the present application is designed to embed sleeve 11 and anchor bolt 6 at reinforcement cage 9, then grouting to form embedded column footing 8 with shear key 7 and concrete beam 81, when the concrete strength reaches more than 70% of the design strength, cut off the part of sleeve 11 above the surface of column footing 8, weld steel column 1, column footing base 3 and rib plate 4 according to the above structure, then weld shear key 7 on the side of the lowermost column footing base 3 away from the structure according to the design, after completing all the structures of the column footing, pass the column footing base 3 through the anchor bolt 6, embed the shear key 7 in the sleeve 11, make the steel column 1 stand on the column footing 8, adjust and fix the anchor bolt 6, then pour the secondary grouting layer 10, support the formwork at the column footing and pour to form the column footing protection layer 2.

[0036] Example 1: high-rise residential steel column footing shear structure Application scenario: suitable for the connection node of steel column 1 and foundation of 18-story frame-shear wall structure residence, the beam column longitudinal reinforcement and hoop reinforcement are dense, the longitudinal reinforcement diameter is 25mm, the hoop reinforcement spacing is 100mm, and the conflict problem of shear key 7 and reinforcement cage 9 needs to be solved.

[0037] Steel column 1: Q355B grade H-shaped steel is adopted, the cross-sectional size is HW300*300*10*15, and the height is 5.2m.

[0038] Column footing base 3: First bottom plate 14: Q235B steel plate, size 600mm*600mm*20mm; Second bottom plate 15: Q235B steel plate, size 550mm*550mm*16mm; Rib plate 4: 8 Q355B steel plates, size 300mm*200mm*12mm, annularly distributed between the two bottom plates, and the side edge is welded with the flange of steel column 1 with an angle weld seam height of 8mm.

[0039] Anchor bolt 6: 6 M24 high-strength bolts of 8.8 grade, the lower part is bent at an angle of 90°, and is embedded in column footing 8 by 800mm.

[0040] Shear key 7 and sleeve 11: Shear key 7: 4 40Cr steel rods with a diameter of 20mm and a length of 400mm, which are tightly welded at the bottom of the second bottom plate 15; Sleeve 11: 20MnTiB alloy structural steel is adopted, the inner diameter is 22mm, which is slightly larger than the diameter of shear key 7, the length is 350mm, and the pre-embedding distance from the longitudinal reinforcement is greater than or equal to 30mm to avoid the dense area of reinforcement cage 9.

[0041] Column footing 8: C35 concrete is adopted, which contains longitudinal reinforcement 12 Φ25 and hoop reinforcement Φ10@100 of HRB400 grade reinforcement cage 9, and the concrete protection layer thickness is 50mm.

[0042] Grouting and protection: the secondary grouting layer 10 uses CGM-4 non-shrinkage grouting material, with a thickness of 50 mm; the column foot protection layer 2 is C30 concrete, with a thickness of 100 mm, and the lower end of the shear key 7 is connected to a 300 mm x 300 mm x 150 mm C40 reinforced pier block 13.

[0043] Construction points: The sleeve 11 is positioned by BIM modeling during pre-burying, avoiding the intersection point of the reinforcement cage 9; After the column foot foundation 8 concrete strength reaches 70% of the design value of 35 MPa, the 50 mm part of the sleeve 11 above the foundation surface is cut off; Before secondary grouting, high-pressure gas is used to clean the debris in the sleeve 11, ensuring that the embedded depth of the shear key 7 is ≥300 mm.

[0044] Example 2: Shear structure of industrial plant crane beam steel column foot Application scenario: suitable for the crane beam steel column 1 foot of a 30 m span portal frame industrial plant, the node bears a large horizontal braking force, the reinforcement cage 9 contains multiple layers of 80 mm spacing, and the steel reinforcement density is high.

[0045] Structural parameters Steel column 1: Q355C grade welded I-shaped section, section size 400 mm x 300 x 12 x 20, height 8.5 m.

[0046] Column foot chassis 3: First bottom plate 14: Q355B steel plate, size 800 mm x 800 mm x 25 mm; Second bottom plate 15: Q355B steel plate, size 750 mm x 750 mm x 20 mm; Rib plate 4: 12 Q355B steel plates, size 400 mm x 250 mm x 16 mm, arranged in a ring shape, with side edges welded to the web of the steel column 1 with a fillet weld height of 10 mm.

[0047] Foundation bolt 6: 8 M30 high-strength bolts grade 10.9, with a lower bending angle of 60°, buried to a depth of 1000 mm in the column foot foundation 8.

[0048] Shear key 7 and sleeve 11: Shear key 7: 6 40Cr steel rods with a diameter of 25 mm, length 500 mm, welded to the bottom of the second bottom plate 15 with an interval of 300 mm; Sleeve 11: made of 20MnTiB alloy structural steel, inner diameter 27 mm, length 450 mm, arranged with a clear distance ≥50 mm from the reinforcement cage 9 during pre-burying.

[0049] Column base 8: C40 concrete pouring, containing HRB500 grade steel cage 9 longitudinal reinforcement 16 Φ28, stirrup Φ12@80, patch Φ10@200, concrete cover thickness 70mm.

[0050] Grouting and protection: secondary grouting layer 10 uses CGM-5 non-shrinkage grouting material, thickness 80mm; column foot protection layer 2 is C35 concrete, thickness 150mm, lower end of shear key 7 connects 400mm×400mm×200mm C45 reinforced pier block 13.

[0051] Construction points: Sleeve 11 is fixed by positioning support when pre-buried, and the axis deviation is controlled within ±5mm; After the column base 8 concrete strength reaches 70% of the design value 28MPa, the high part of the sleeve 11 is cut off by using a toothless saw, and the flatness of the cut is ≤2mm; After the shear key 7 is embedded in the sleeve 11, the verticality deviation of the steel column 1 is adjusted by the total station to be ≤1 / 1000 of the column height, and then the foot bolt 6 is tightened.

[0052] Common advantages of the two embodiments: through the flexible positioning of the alloy structural steel sleeve 11 and the shear key 7, the steel reinforcement dense area is avoided, and under the premise of not increasing the cost, the shear bearing capacity is increased by more than 20% compared with the traditional pre-buried shear key 7, and the construction qualified rate reaches 100% The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A shear key steel structure for a densely reinforced steel node, characterized by: The invention comprises a steel column (1), a column base frame (3), anchor bolts (6), shear keys (7), a sleeve (11) and a column base (8), wherein the column base frame (3) is installed in the column base (8) through the anchor bolts (6), the steel column (1) is installed on the column base frame (3), and a plurality of shear keys (7) are provided at the bottom of the column base frame (3), and the shear keys (7) are inserted into the column base (8) and are sleeved with a sleeve (11).

2. A shear key steel structure for a densely reinforced steel node according to claim 1, characterized in that: The column foot base (3) comprises a first base plate (14) and a second base plate (15), and a plurality of ribs (4) distributed in an annular shape are arranged between the first base plate (14) and the second base plate (15).

3. The shear key steel structure for a densely reinforced steel node according to claim 2, characterized in that: One side of the rib plate (4) is welded to the steel column (1).

4. The shear key steel structure for a densely reinforced steel node according to claim 1, characterized in that: The upper portion of the anchor bolt (6) is connected to the first base plate (14) via a bolt (12) and a gasket (5), and the lower portion of the anchor bolt (6) is bent.

5. The shear key steel structure for a densely reinforced steel node according to claim 2, characterized in that: The first bottom plate (14) and the second bottom plate (15) are provided with radially distributed perforations at the gap between two adjacent ribs (4), and the number of the perforations is preferably 16.

6. The shear key steel structure for a densely reinforced steel node according to claim 1, characterized in that: The column foot foundation (8) comprises a steel beam (81), a steel cage (9) and poured concrete.

7. The shear key steel structure for a densely reinforced steel node according to claim 1, characterized in that: The sleeve (11) is embedded in the gap of the steel cage (9) before pouring the column base (8), and its inner diameter is slightly larger than the diameter of the shear key (7) to facilitate the embedding of the shear key (7); when the concrete strength of the column base (8) reaches more than 70% of the design value, the portion of the sleeve (11) that is higher than the surface of the column base (8) is cut off.

8. The shear key steel structure for a densely reinforced steel node according to claim 1, characterized in that: A grouting layer (10) is poured between the second bottom plate (15) and the column foot foundation (8), and a column foot protection layer (2) is poured on the upper part of the grouting layer (10), wherein the column foot protection layer (2) is a concrete layer.

9. The shear key steel structure for a densely reinforced steel node according to claim 1, characterized in that: The lower end of the shear key (7) corresponding to the concrete layer is connected to a reinforcement pier block (13).

10. The shear key steel structure for a densely reinforced steel node according to claim 1, characterized in that: The sleeve (11) is made of alloy structural steel material.

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