Steel column base joint with cross-shaped shear-resistant piece

Abstract

The utility model provides a steel column base node with a cross-shaped anti-shearing piece, the interior of a foundation pit where a rectangular steel pipe column base is located is divided into three areas including a fine aggregate concrete foundation area, a post-pouring layer and an anti-shearing piece groove, and the fine aggregate concrete foundation area and the post-pouring layer are poured in tandem; the four foundation bolts are distributed on the periphery of the shear-resistant piece groove, the heads of the four foundation bolts face downwards and are embedded in the fine aggregate concrete foundation area, and the thread ends of the four foundation bolts penetrate through the post-pouring layer to be exposed out of the upper portion of the foundation pit. A foundation steel plate and a cross-shaped anti-shearing piece are sequentially welded to the column bottom of the rectangular steel pipe column, the cross-shaped anti-shearing piece is inserted into an anti-shearing piece groove in the middle, the foundation steel plate is tightly attached to the top of a foundation pit, and thread ends of four foundation bolts penetrate through four installation holes to be exposed upwards and are fastened to the upper end of the foundation steel plate through nuts and gaskets. And an outer wrapping concrete protection layer is poured outside the column foot of the rectangular steel pipe column. On the premise that the distribution of a main body structure is not changed, the overall rigidity and the anti-seismic property of the structure can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of construction, in particular to a steel column foot node with a cross shear-resistant piece. Background Art

[0002] In building structures, the column foot structural design is like the roots of a tree, playing a vital role in the overall stability of the structure. In the construction of prefabricated low-rise buildings, in order to ensure a large space, a layered assembly form of "beam penetration and column layering" is adopted, and flat steel column supports must be set between local steel columns to increase the lateral stiffness in this direction. Correspondingly, under the action of an earthquake, the distributed load is also greater, so the column foot of the steel column with column support needs to be strengthened accordingly. Utility Model Content

[0003] In order to solve the above technical problems, the utility model proposes a steel column base node with a cross shear member, which can ensure the overall stiffness and seismic performance of the structure without changing the distribution of the main structure.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A steel column foot node with a cross shear member has the following structural features:

[0006] The foundation pit where the foot of the rectangular steel pipe column is located is divided into three areas, including a "concave" fine stone concrete foundation area, an inverted "convex" post-casting layer located above the fine stone concrete foundation area, and a shear member groove located in the middle of the post-casting layer; the fine stone concrete foundation area and the post-casting layer are cast one after the other and embedded to form the main structure of the foundation pit. The shear member groove is diamond-shaped, with a cross-sectional size larger than that of the rectangular steel pipe column, and is opened vertically downward from the top of the foundation pit and extends to the lower end of the post-casting area;

[0007] Four anchor bolts are symmetrically distributed around the center of the foundation pit on the periphery of the shear member slot, with their heads facing downwards, pre-buried in the fine stone concrete foundation area, and the thread ends pass through the post-casting layer and are exposed above the foundation pit;

[0008] The bottom of the rectangular steel pipe column is welded with an anchor steel plate and a cross-shaped shear member in sequence. Installation holes are reserved at the four corners of the anchor steel plate according to the position distribution and outer dimensions of the four anchor bolts. The cross-shaped shear member is centrally inserted into the shear member groove, and the transverse shear plate and the longitudinal shear plate are respectively aligned with the two diagonals of the shear member groove. The anchor steel plate is close to the top of the foundation pit, and the thread ends of the four anchor bolts are exposed upward through the four installation holes and are fastened to the upper end of the anchor steel plate by nuts and gaskets. The column base of the rectangular steel pipe column is cast with an external concrete protective layer, and the four anchor bolts and the anchor steel plate are all located in the external concrete protective layer.

[0009] The structural features of the utility model also lie in:

[0010] Full penetration welding is performed between the rectangular steel pipe column and the anchor steel plate, and double-sided groove welding is performed between the anchor steel plate and the cross-shaped shear member.

[0011] The fine stone concrete foundation area is cast by C25 concrete, the post-cast layer and the shear member groove are cast by C40 non-shrinkage fine stone concrete or iron filings mortar, and the outer concrete protective layer is cast by C20 concrete.

[0012] An ear plate is arranged between the outer cylindrical surface on one side of the rectangular steel pipe column and the top of the outer concrete protective layer, and the flat steel column support is detachably connected to the ear plate.

[0013] The anchor steel plate is 24 mm thick, the transverse shear plate and the longitudinal shear plate of the cross-shaped shear member are 10 mm thick, the anchor bolts are M24×600 mm hook bolts, and the gasket is 8 mm thick.

[0014] Compared with the prior art, the beneficial effects of the utility model are embodied in:

[0015] The utility model pre-buries the anchor bolts in the fine stone concrete foundation area in the foundation pit, and then assembles them with the anchor steel plate welded to the rectangular steel pipe column in advance, and uses the cross-shaped shear member to cooperate with the shear member groove in the post-casting layer, and then casts the post-casting layer and the shear member groove, and casts the outer concrete protective layer outside the column foot. This connection form greatly improves the shear resistance of the column foot node, and effectively improves the overall seismic resistance of the prefabricated integrated house, solves the problem of insufficient shear stiffness of the steel column root of the prefabricated ground floor house with column support, and has good application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side view structural schematic diagram of the utility model;

[0017] Figure 2 It is a main structural schematic diagram of the utility model;

[0018] Figure 3 It is a structural diagram of rectangular steel pipe columns, anchor steel plates, and cross-shaped shear members.

[0019] In the figure, 1 is the fine stone concrete foundation area; 2 is the post-cast layer; 3 is the shear member groove; 4 is the anchor bolt; 5 is the rectangular steel pipe column; 6 is the anchor steel plate; 7 is the cross-shaped shear member; 8 is the ear plate; 9 is the support between the flat steel columns; 10 is the nut; 11 is the gasket; 12 is the external concrete protective layer. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Please refer to Figures 1 to 3 The node structure of the steel column base with cross shear members in this embodiment is set as follows:

[0022] The foundation pit where the rectangular steel pipe column foot is located is divided into three areas, including a "concave" fine stone concrete foundation area 1, an inverted "convex" post-casting layer 2 located above the fine stone concrete foundation area 1, and a shear member groove 3 located in the center of the post-casting layer 2; the fine stone concrete foundation area 1 and the post-casting layer 2 are cast one after the other, and are embedded to form the main structure of the foundation pit. The shear member groove 3 is rhombus-shaped, with a cross-sectional size larger than that of the rectangular steel pipe column, and is vertically opened downward from the top of the foundation pit and extends to the lower end of the post-casting area;

[0023] Four anchor bolts 4 are symmetrically distributed around the center of the foundation pit on the periphery of the shear member groove 3, with their heads facing downwards, pre-buried in the fine stone concrete foundation area 1, and the thread ends pass through the post-casting layer 2 and are exposed above the foundation pit;

[0024] The bottom of the rectangular steel pipe column is welded with an anchor steel plate 6 and a cross-shaped shear member 7 in sequence. Mounting holes are reserved at the four corners of the anchor steel plate 6 according to the position distribution and outer dimensions of the four anchor bolts 4. The cross-shaped shear member 7 is centrally inserted into the shear member groove 3. The transverse shear plate and the longitudinal shear plate are respectively aligned with the two diagonals of the shear member groove 3. The anchor steel plate 6 is close to the top of the foundation pit. The thread ends of the four anchor bolts 4 are exposed upward through the four mounting holes and are fastened to the upper end of the anchor steel plate 6 by nuts 10 and gaskets 11. The column base of the rectangular steel pipe column is cast with an external concrete protective layer 12, and the four anchor bolts 4 and the anchor steel plate 6 are all located in the external concrete protective layer 12.

[0025] In the specific implementation, the corresponding structural settings also include:

[0026] The rectangular steel pipe column and the anchor steel plate 6 are fully penetrated and welded, and the anchor steel plate 6 and the cross-shaped shear member 7 are double-sided groove welded.

[0027] The fine stone concrete foundation area 1 is cast by C25 concrete, the post-casting layer 2 and the shear member groove 3 are cast by C40 non-shrinkage fine stone concrete or iron filings mortar, and the outer concrete protective layer 12 is cast by C20 concrete.

[0028] An ear plate 8 is arranged between the outer cylindrical surface of one side of the rectangular steel pipe column and the top end of the outer concrete protective layer 12, and the flat steel column support 9 is detachably connected to the ear plate 8.

[0029] The anchor steel plate 6 is 24 mm thick, the transverse shear plate and the longitudinal shear plate of the cross-shaped shear member 7 are 10 mm thick, the anchor bolt 4 is a hook bolt of M24×600 mm, and the gasket 11 is 8 mm thick.

[0030] The design idea of ​​this embodiment is: first excavate the foundation pit, and before pouring the independent foundation, pre-embed the anchor bolts 4 into the fine stone concrete foundation area 1 and then pour it, and reserve the post-casting layer 2, and weld the cross-shaped shear member 7 with the anchor steel plate 6 and the steel column in advance to form a whole. After the steel member is in place as a whole, fill the post-casting layer 2 tightly, and then pour the outer concrete protective layer 12. The following examples can be used for construction:

[0031] a. At the nodes, excavate the foundation pit in advance, locate the four anchor bolts at four locations, bury the anchor bolts 4, and extend the hook ends into the bottom of the foundation pit. Support the formwork, pour C25 concrete to the designed elevation, form the fine stone concrete foundation area 1, reserve the shear member groove 3 and the post-casting layer 2, and remove the formwork after curing.

[0032] b. Weld the rectangular steel pipe column, the anchor steel plate 6 and the cross-shaped shear member 7 into a whole, wherein the contact surface between the rectangular steel pipe column and the anchor steel plate 6 is fully penetrated, the anchor steel plate 6 and the cross-shaped shear member 7 are double-sided groove welded, and the anchor steel plate 6 is pre-opened with four mounting holes;

[0033] c. Align the hole of the anchor steel plate 6 with the thread end of the anchor bolt 4, pass the anchor bolt 4 through the installation hole, and preliminarily position the lining and nut 10. After the overall positioning is completed, weld the gasket 11 to the anchor steel plate 6 on all four sides;

[0034] d. Use C40 non-shrinkage fine stone concrete or iron filings mortar to pour the post-casting layer 2 and the shear member groove 3 densely, and finally tighten the anchor nut 10;

[0035] e. Formwork, after the upper steel structure is installed, use C20 concrete to pour the outer concrete protective layer 12;

[0036] f. After the curing of the outer concrete protective layer 12 is completed and the formwork is removed, the flat steel column support 9 can be installed.

[0037] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A steel column foot node with a cross shear member, characterized by: The foundation pit where the rectangular steel pipe column foot is located is divided into three areas, including a "concave" fine stone concrete foundation area, an inverted "convex" post-casting layer located above the fine stone concrete foundation area, and a shear member groove located in the middle of the post-casting layer; the fine stone concrete foundation area and the post-casting layer are cast one after the other and embedded to form the main structure of the foundation pit. The shear member groove is diamond-shaped, with a cross-sectional size larger than that of the rectangular steel pipe column, and is opened vertically downward from the top of the foundation pit and extends to the lower end of the post-casting area; Four anchor bolts are symmetrically distributed around the center of the foundation pit on the periphery of the shear member slot, with their heads facing downwards, pre-buried in the fine stone concrete foundation area, and the thread ends pass through the post-casting layer and are exposed above the foundation pit; The bottom of the rectangular steel pipe column is welded with an anchor steel plate and a cross-shaped shear member in sequence. Installation holes are reserved at the four corners of the anchor steel plate according to the position distribution and outer dimensions of the four anchor bolts. The cross-shaped shear member is centrally inserted into the shear member groove, and the transverse shear plate and the longitudinal shear plate are respectively aligned with the two diagonals of the shear member groove. The anchor steel plate is close to the top of the foundation pit, and the thread ends of the four anchor bolts are exposed upward through the four installation holes and are fastened to the upper end of the anchor steel plate by nuts and gaskets. The column base of the rectangular steel pipe column is cast with an external concrete protective layer, and the four anchor bolts and the anchor steel plate are all located in the external concrete protective layer.

2. The steel column base node with a cross shear member according to claim 1 is characterized in that: Full penetration welding is performed between the rectangular steel pipe column and the anchor steel plate, and double-sided groove welding is performed between the anchor steel plate and the cross-shaped shear member.

3. The steel column base node with a cross shear member according to claim 1 is characterized in that: The fine stone concrete foundation area is cast by C25 concrete, the post-cast layer and the shear member groove are cast by C40 non-shrinkage fine stone concrete or iron filings mortar, and the outer concrete protective layer is cast by C20 concrete.

4. The steel column base node with a cross shear member according to claim 1 is characterized in that: An ear plate is arranged between the outer cylindrical surface on one side of the rectangular steel pipe column and the top of the outer concrete protective layer, and the flat steel column support is detachably connected to the ear plate.

5. The steel column base node with a cross shear member according to claim 1 is characterized in that: The anchor steel plate is 24 mm thick, the transverse shear plate and the longitudinal shear plate of the cross-shaped shear member are 10 mm thick, the anchor bolts are M24×600 mm hook bolts, and the gasket is 8 mm thick.

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