A connection structure for the base of a layered steel column

Abstract

The present invention provides a connection structure of the column foot of a layered steel column, including a steel column, a stiffening connection plate, an anti-buckling steel plate, a boot beam web, a positioning anchor bolt, a plate lower support rib plate, a beam anchor bolt, a prestressed component, an existing prestressed beam, an existing structural plate, a boot beam rib plate, a lower support steel plate, a boot beam cross plate, a column bottom cushion layer, a column foot bottom plate, a washer, a lower support side plate, etc. The present invention connects the plate anchor bolt with the lower steel plate support to effectively transmit the internal force of the column foot to the new and old structure combination node, which not only solves the problem that the number and length of anchors cannot meet the design requirements, but also improves the ultimate bearing capacity of the connection between the column foot and the existing structure; the post-built column foot node ensures the improvement of the overall stiffness and seismic performance of the node without destroying the performance of the existing structure, and better realizes the design principle of strong connection of structural components with weak components; the column foot node has a simple structure and is convenient for the construction of prefabricated components.

Description

Technical Field

[0001] The invention relates to the technical field of building structure engineering, and in particular to a connection structure of column foot of a layered steel column. Background Art

[0002] With the rapid development of modern construction industry, the number of renovation and expansion projects of existing buildings has increased due to factors such as changes in usage functions or the need for expansion. However, there are also projects that are difficult to complete successfully using conventional construction techniques.

[0003] When using post-tensioned bonded prestressed floor beams, it is difficult to use the traditional method of first destroying and then planting or welding at the beam-column joints. It is impossible to ensure that the bearing capacity of the column foot meets the use requirements, and it is also impossible to ensure the overall stiffness and stability of the existing and new buildings. The reason is that the steel bars in the top area of ​​the original structure column are densely distributed, and there are many prestressed steel bars interspersed in it. The plate bars, beam bars and column main bars are headed, making it difficult for the drill bit to effectively avoid the original steel bars, resulting in the inability to guarantee the diameter and depth of the drill hole, which ultimately brings many technical difficulties to the design and construction. Summary of the invention

[0004] In view of the problem that there is no extra space for anchoring at the beam-column joints of post-tensioned bonded prestressed technology floors, so that the stiffness of the column base cannot meet the use requirements, the present invention provides a connection structure for the column base of a layered steel column, which can improve the ultimate bearing capacity of the connection between the column base and the built structure, effectively reduce damage to existing buildings, and has a simple structure and is convenient for the construction of prefabricated components.

[0005] In order to achieve the above-mentioned purpose of the invention, the specific technical solution of the connection structure of the column foot of the added-layer steel column provided by the present invention is as follows:

[0006] A connection structure of a layered steel column foot comprises: a steel column, a stiffening connection plate, an anti-buckling steel plate, a shoe beam web, a positioning anchor bolt, a plate lower support rib plate, a beam through-anchor bolt, a prestressed component, an existing prestressed beam, an existing structural plate, a shoe beam rib plate, a lower support steel plate, a shoe beam cross plate, a column bottom cushion layer, a column foot bottom plate, a shim, and a lower support side plate.

[0007] A column foot bottom plate is provided at the upper bottom of the column foot of the added steel column. The web of the boot beam is welded to the steel column and the column foot bottom plate. The cross plate of the boot beam is horizontally welded to the web of the boot beam and the top of the boot beam rib plate. The boot beam rib plate is welded to the cross plate of the boot beam and the column foot bottom plate. The stiffening connecting plate and the anti-buckling steel plate are welded to the side plate of the steel column to ensure the bending and shear resistance of the column foot.

[0008] In the present invention, the shoe beam height and the column foot anchor bolt size must meet the column foot design value and the connection ultimate bearing capacity requirements.

[0009] Positioning anchor bolts are symmetrically arranged on both sides of the web of the boot beam within the range of the boot beam cross plate, and the column foot bottom plate and the boot beam cross plate anchored within the range of the prestressed tendons are provided with waist-shaped through holes to adjust the horizontal position of the steel column to ensure that the prestressed components and stressed steel bars are avoided without moving the column position.

[0010] After the anchor bolts arranged at the corners of the base plate pass through the pre-drilled rebar holes, the lower ends of the bolts are connected to the lower steel plate supports to solve the problem that the rebar embedding depth does not meet the design requirements due to insufficient floor slab thickness; the lower steel plate support is welded by two lower support steel plates, lower support side plates and lower support ribs. The lower support steel plates include lower support upper steel plates and lower support lower steel plates. The inner sides of adjacent lower supports are connected by through-hole bolts to ensure the integrity of the node stress deformation.

[0011] Furthermore, the cross plate of the boot beam and the bottom plate of the column foot of the present invention are respectively provided with a plurality of corresponding anchor bolt through holes, and the anchor bolt through holes are located on both sides of the web of the boot beam; the upper and lower steel plates of each lower support are provided with corresponding anchor bolt through holes, and preferably there are 4 anchor bolt through holes.

[0012] Furthermore, in the present invention, shoe beam ribs are symmetrically distributed on both sides of each anchor bolt through hole on the upper shoe beam and the lower support.

[0013] Furthermore, according to the present invention, two corresponding anchor bolt through holes are reserved on the lower support side plates on both sides of the built prestressed beam, and the gap between the lower support side plates and the prestressed member is filled with caulking pressure-bearing material.

[0014] Furthermore, the upper part of the floor positioning anchor of the present invention passes through the anchor through hole and washer on the cross plate of the boot beam, and then the anchor is covered with a washer. The top of the anchor is connected with a nut that presses the washer. The washer is welded to the bottom plate of the column foot, and the anchor washer is welded to the cross plate of the boot beam. The anchoring method after the bolt passes through the floor is the same as the upper support method. After passing through the floor reinforcement hole, the bolt passes through the upper steel plate of the lower support, the washer and the lower steel plate of the lower support respectively. The bottom of the positioning anchor is connected with a nut that presses the washer. The washer is welded to the upper steel plate of the lower support, and the perforated bolt on the inner side of the lower support passes through the existing prestressed beam and is bolted to the adjacent support to ensure the integrity of the node stress deformation.

[0015] Furthermore, the anchor bolt through hole on the prestressed component of the present invention is formed into a U-shaped notch, and glue is poured into the rebar planting hole.

[0016] The beneficial effects of the connection structure of the column foot of the layered steel column provided by the present invention are:

[0017] The connection structure of the column foot of the added-layer steel column provided by the present invention is an exposed beam-and-shoe column foot, which is connected to the lower steel plate support through the plate anchor bolts, and effectively transmits the internal force of the column foot to the combined node of the new and old structures, which not only solves the problem that the number and length of anchors cannot meet the design requirements, but also improves the ultimate bearing capacity of the connection node between the column foot and the built structure;

[0018] The post-construction column foot node ensures the improvement of the overall stiffness and seismic performance of the node without destroying the performance of the existing structure, and better realizes the design principle of strong connection of weak structural components;

[0019] Compared with embedded column bases, it can effectively reduce the damage to existing buildings and facilitate construction; compared with outsourced column bases, it can greatly save outsourced columns;

[0020] The column base node has a simple structure and is convenient for the construction of prefabricated components. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic elevation view of the connection structure of the column foot of the additional-story steel column of the present invention.

[0022] Figure 2 It is a schematic AA cross-sectional view of the connection structure of the column foot of the added-layer steel column of the present invention.

[0023] Figure 3 It is a schematic cross-sectional view of the connection structure BB of the column foot of the additional-story steel column of the present invention.

[0024] Figure 4 It is a plan view of the steel column bottom plate (b) and the shoe beam cross plate (a) of the connection structure of the column foot of the added-layer steel column of the present invention.

[0025] In the figure:

[0026] 1. Steel column; 2. Stiffening connecting plate; 3. Anti-buckling steel plate; 4. Boot beam web; 5. Positioning anchor bolts; 6. Ribs for support under the plate; 7. Through-beam anchor bolts; 8. Caulking pressure-bearing materials; 9. Prestressed member; 10. Built prestressed beam; 11. Built structural plate; 12. Boot beam ribs; 13. Lower support steel plate; 14. Boot beam cross plate; 15. Column bottom cushion; 16. Column foot bottom plate; 17. Washer iron; 18. Lower support side plate. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings and preferred embodiments of the present invention, but the protection scope of the present invention is not limited to the following specific embodiments.

[0028] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0029] Example

[0030] The connection structure of the column foot of the additional steel column used in this embodiment is as shown in FIG. Figures 1 to 4 , specifically:

[0031] The connection structure of the column foot of the added-story steel column provided in this embodiment includes: a steel column 1, a stiffening connecting plate 2, an anti-buckling steel plate 3, a boot beam web 4, a positioning anchor bolt 5, a support rib plate under the plate 6, a through-beam anchor bolt 7, a caulking pressure-bearing material 8, a prestressed member (built structural column) 9, a built prestressed beam 10, a built structural plate 11, a boot beam rib plate 12, a lower support steel plate 13, a boot beam cross plate 14, a column bottom cushion layer 15, a column foot bottom plate 16, a shim 17, and a lower support side plate 18.

[0032] A column foot bottom plate 16 is provided at the bottom of the upper column of the added-story steel column, the shoe beam web plate 4 is welded to the steel column 1 and the column foot bottom plate 16, the shoe beam cross plate 14 is horizontally welded to the shoe beam web plate 4 and the top of the shoe beam rib plate 12, the boot beam rib plate 12 is welded to the boot beam cross plate 14 and the column foot bottom plate 16, the stiffening connecting plate 2 and the anti-buckling steel plate 3 are welded to the side plate of the steel column 1 to ensure the bending and shear resistance capacity of the column foot.

[0033] Positioning anchor bolts 5 are symmetrically arranged on both sides of the boot beam web 4 within the range of the boot beam cross plate 14, and are anchored in the column foot bottom plate 16 within the range of the prestressed tendons. The boot beam cross plate 14 is provided with waist-shaped through holes to adjust the horizontal position of the steel column to ensure that the prestressed components and stressed steel bars are avoided without moving the column position.

[0034] After the anchor bolts arranged at the corners of the base plate pass through the pre-drilled reinforcement holes, the lower ends of the bolts are connected to the lower steel plate supports to solve the problem that the reinforcement depth does not meet the design requirements when the floor thickness is insufficient; the lower steel plate support is welded by two lower support steel plates 13, lower support side plates 18 and lower support ribs 6. The lower support steel plate 13 includes a lower support upper steel plate and a lower support lower steel plate. The inner sides of adjacent lower supports are connected by through-hole bolts to ensure the integrity of the node stress deformation.

[0035] The boot beam cross plate 14 and the column foot bottom plate 16 are respectively reserved with multiple corresponding anchor bolt through holes, and the anchor bolt through holes are located on both sides of the boot beam web plate 4; the upper and lower steel plates 13 of each lower support are reserved with 4 corresponding anchor bolt through holes. Boot beam ribs 12 are symmetrically distributed on both sides of each anchor bolt through hole on the upper boot beam and the lower support. Two corresponding anchor bolt through holes are reserved on the lower support side plates 18 on both sides of the built prestressed beam 10, and the gap between the lower support side plates 18 and the prestressed member 9 is filled with caulking pressure-bearing material 8.

[0036] The upper part of the floor slab positioning anchor bolt 5 passes through the anchor bolt through hole and the washer 17 on the boot beam cross plate 14, and then the positioning anchor bolt 5 is covered with a pad. The top of the positioning anchor bolt 5 is connected with a nut that presses the pad. The washer 17 is welded to the column foot bottom plate 16, and the anchor pad is welded to the boot beam-cross plate 14. The anchoring method after the bolt passes through the floor slab is the same as the upper support method. After passing through the floor slab reinforcement hole, the bolt passes through the lower support upper steel plate, the washer 17 and the lower support lower steel plate respectively. The bottom of the positioning anchor bolt 5 is connected with a nut that presses the pad. The washer 17 is welded to the lower support upper steel plate. The perforated bolt on the inner side of the lower support passes through the existing prestressed beam 10 and is bolted to the adjacent support to ensure the integrity of the node stress deformation.

[0037] The anchor bolt through hole on the prestressed member 9 is made into a U-shaped notch, and glue is poured into the rebar planting hole.

[0038] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to the above descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A connection structure for the base of a layered steel column, characterized in that: It comprises a steel column (1), a stiffening connection plate (2), an anti-buckling steel plate (3), a boot beam web (4), a positioning anchor bolt (5), a plate lower support rib plate (6), a beam through-anchor bolt (7), a prestressed member (9), an existing prestressed beam (10), an existing structural plate (11), a boot beam rib plate (12), a lower support steel plate (13), a boot beam cross plate (14), a column bottom cushion layer (15), a column foot bottom plate (16), a washer (17), and a lower support side plate (18); The upper column bottom of the added-layer steel column is provided with a column foot bottom plate (16); the boot beam web plate (4) is welded to the steel column (1) and the column foot bottom plate (16); the boot beam cross plate (14) is horizontally welded to the boot beam web plate (4) and the top of the boot beam rib plate (12); the boot beam rib plate (12) is welded to the boot beam cross plate (14) and the column foot bottom plate (16); the stiffening connection plate (2) and the anti-buckling steel plate (3) are welded to the side plate of the steel column (1); within the range of the boot beam cross plate (14), the boot beam web is welded to the top of the boot beam rib plate (12); Positioning anchor bolts (5) are symmetrically arranged on both sides of the plate (4), and the column foot bottom plate (16) and the boot beam cross plate (14) are anchored within the range of the prestressed tendons and are provided with oval through holes for adjusting the horizontal position of the steel column (1); after the anchor bolts arranged at the corners of the bottom plate pass through the pre-drilled reinforcement holes, the lower ends of the bolts are connected to the lower steel plate support; the lower steel plate support is welded and formed by two lower support steel plates (13), lower support side plates (18) and the plate lower support rib plate (6); The lower support steel plate (13) comprises an upper steel plate for the lower support and a lower steel plate for the lower support, and each adjacent lower support is connected by a through-hole bolt on the inner side; the shoe beam cross plate (14) and the column foot bottom plate (16) are respectively reserved with corresponding anchor bolt through holes, and the anchor bolt through holes are located on both sides of the shoe beam web plate (4); the upper steel plates for each lower support and the lower steel plates for the lower support are reserved with corresponding anchor bolt through holes; the shoe beam ribs (12) are symmetrically distributed on both sides of each anchor bolt through hole on the upper shoe beam and the lower support.

2. The connection structure of the column foot of the added-layer steel column according to claim 1, characterized in that: Two corresponding anchor bolt through holes are reserved on the lower support side plates (18) on both sides of the built prestressed beam (10), and the gap between the lower support side plates (18) and the prestressed component (9) is filled with caulking pressure-bearing material (8).

3. The connection structure of the column foot of the multi-layer steel column according to claim 1, characterized in that: After the upper part of the positioning anchor bolt (5) passes through the anchor bolt through hole and the washer (17) on the boot beam cross plate (14), the positioning anchor bolt (5) is covered with the washer plate, and the top of the positioning anchor bolt (5) is connected with a nut for pressing the washer plate, the washer (17) is welded to the column foot bottom plate (16), and the anchor washer plate is welded to the boot beam cross plate (14); after the bolt passes through the floor slab reinforcement hole, it passes through the lower support upper steel plate, the washer (17) and the lower support lower steel plate respectively, the bottom of the positioning anchor bolt (5) is connected with a nut for pressing the washer plate, the washer (17) is welded to the lower support upper steel plate, and the perforated bolt on the inner side of the lower support passes through the existing prestressed beam (10) and is bolted to the adjacent support.

4. The connection structure of the column foot of the added-layer steel column according to claim 1, characterized in that: The anchor bolt through hole on the prestressed component (9) is formed into a U-shaped notch.

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