Connecting joint of fabricated reinforced concrete column and steel beam

Abstract

The utility model discloses a connecting node of an assembly type reinforced concrete column and a steel beam, which solves the problem that the shearing force of a connecting bolt at the connecting node of the reinforced concrete column and the steel beam is very large in the prior art. According to the connecting joint of the assembly type reinforced concrete column and the steel beam, a connecting vertical plate of a bracket and a web plate of the steel beam are in lap joint, aligned bolt holes are formed in the lap joint position, and an anti-shearing sleeve and a high-strength bolt are sequentially arranged in an expanded hole formed after the bolt holes are expanded; the shear-resistant sleeve is a high-performance alloy sleeve with the shear strength larger than that of the high-strength bolt. According to the technology, broaching treatment is conducted on an original bolt hole, the expanded space for installing the shear-resistant sleeve is formed, the shear-resistant sleeve is stuffed into the expanded space, the shear-resistant sleeve is made to span between the connecting vertical plate and the steel beam web, the shear face between the connecting vertical plate and the steel beam web is locally enhanced, and enhancement includes increase of the shear-resistant face and increase of the shear-resistant face. Also included is an increase in shear strength.

Description

Technical Field

[0001] The utility model relates to the technical field of steel structure building construction. Background Art

[0002] In steel structure buildings, for the connection of steel structures, according to the different connection levels, large hexagonal head bolts are used for low strength requirements, and torsion shear type high-strength bolts are used for high strength requirements. Figure 1 shown.

[0003] Among them, the shear resistance of torsion shear type high-strength bolts is much higher than that of ordinary large hexagon head bolts. The principle is that the shear resistance and pressure bearing capacity of torsion type high-strength bolts are excellent, and they can withstand the shear force from the connection node.

[0004] Considering that under the repeated action of strong earthquakes, the steel beams and the corbels need to withstand repeated shear in the height and horizontal directions, therefore, in the construction of the existing connection nodes between reinforced concrete columns and steel beams, torsional shear type high-strength bolts are used. Utility Model Content

[0005] In order to solve the deficiencies of the prior art, the utility model provides a connection node between an assembled reinforced concrete column and a steel beam, which solves the problem of large shear force of the connection bolts at the connection node between the reinforced concrete column and the steel beam in the prior art.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] The connection node of the assembled reinforced concrete column and the steel beam comprises a reinforced concrete column and a steel beam, wherein the reinforced concrete column and the steel beam are transitionally connected via a corbel, and is characterized in that the connecting vertical plate of the corbel overlaps the web of the steel beam and is provided with aligned bolt holes at the overlap, wherein the enlarged hole of the bolt hole after expansion is provided with a shear sleeve and a high-strength bolt in sequence, wherein the shear sleeve is a high-performance alloy sleeve whose shear strength is greater than the shear strength of the high-strength bolt.

[0008] Furthermore, the shear-resistant sleeve is a chromium-manganese alloy forged sleeve.

[0009] Furthermore, there are two connecting vertical plates in the corbel, and a space is formed in the middle to support the web plate in the steel beam.

[0010] Furthermore, the number of the connecting vertical plate on the corbel is one.

[0011] Furthermore, the connecting vertical plate has an arc-shaped profile, and a group of expanded holes is arranged between the connecting vertical plate and the web.

[0012] Furthermore, the expansion hole groups are arranged in a circular array.

[0013] Furthermore, a nylon mesh cloth gasket is provided at the fitting surface between the web and the connecting vertical plate.

[0014] Furthermore, the total length of the shear sleeve is less than the total length of the expansion channel connecting the vertical plate and the web plate.

[0015] Furthermore, the shear sleeve is fixed on the high-strength bolt by a mechanical method of heating and sleeve placement.

[0016] Furthermore, the shear-resistant sleeve is straight-cylindrical or shuttle-shaped.

[0017] The beneficial effects of the utility model are:

[0018] This technology forms an enlarged space for installing a shear sleeve by expanding the original bolt hole, inserting the shear sleeve into the enlarged space, and making the shear sleeve span between the connecting vertical plate and the web of the steel beam, thereby locally reinforcing the shear surface between the two. The reinforcement includes both an increase in the shear section and an increase in the shear strength, thereby significantly increasing the shear connection strength between the corbel and the steel beam while maintaining the performance of the high-strength bolts used.

[0019] This technology does not significantly increase the construction cost by adding a shear sleeve, and has high practicality, which has positive significance for technology promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The invention is a beam-column connection structure in the prior art.

[0021] Figure 2 This is the beam-column connection structure in this embodiment.

[0022] Figure 3 for Figure 2 Top view of the .

[0023] Figure 4 for Figure 2 Horizontal section view at point A--A.

[0024] Figure 5 for Figure 4 Another state of.

[0025] In the figure:

[0026] 00 torsion shear type high strength bolts,

[0027] 10 bracket structure, 11 embedded plate, 12 connecting vertical plate,

[0028] 20 reinforced concrete columns,

[0029] 30 steel beams, 31 webs

[0030] 40 shear sleeve,

[0031] 50 Nylon Mesh Gasket. DETAILED DESCRIPTION

[0032] This embodiment is combined with the specification Figure 1 To Attachment Figure 5 , the implementation of this technology is explained.

[0033] The connection node of the assembled reinforced concrete column and the steel beam involves a reinforced concrete column 20 and a steel beam 30, wherein the steel beam is a common I-shaped steel beam and is anti-corrosive treated. The reinforced concrete column is a conventional structure, and a corbel structure 10 is pre-embedded and fixed at the elevation position of the reinforced concrete column.

[0034] Embodiment 1

[0035] In this embodiment, the corbel structure 10 includes an embedded plate 11 and a connecting vertical plate 12, wherein the embedded plate is embedded and fixed to the reinforced concrete column by embedded reinforcement and back plate. The connecting vertical plate 12 is welded and fixed to the outer surface of the embedded plate to form a corbel structure, which is used to fix and connect the steel beam. In the traditional connection structure, the steel beam and the embedded steel plate are overlapped, and the overlapped part is connected with a torsion shear type high-strength bolt 00. The structure is referred to as Figure 1 . In the design of this structure, under the action of earthquake, wind and other loads, the connection position of the steel beam and the corbel, specifically the overlap position, will experience repeated pulling, compression and torsion. Under this combined action, a very strong shear force is generated on the torsion shear type high-strength bolt. Since the diameter of the torsion shear type high-strength bolt is a standard diameter and the torsion shear resistance value is also a standard value, fatigue failure is prone to occur. The common solution is to use large-sized torsion shear type high-strength bolts, that is, to improve the shear resistance by selecting bolts with larger diameters.

[0036] The embodiments of the present technology refer to Figures 2 to 4 In this embodiment, the connection hole on the web 31 connecting the vertical plate 12 and the steel beam is enlarged. For example, the original M16 bolt needs to be drilled with a diameter of φ16+0.1㎜. In this embodiment, the M16 bolt is still selected, and its bolt cap is 22 mm. In this embodiment, the hole is drilled and expanded to a large hole of φ18 or φ20, and a shear sleeve 40 is inserted into the expanded hole. The inner diameter of the shear sleeve is φ16, that is, the shear sleeve is inserted into the overlap between the above-mentioned steel beam and the corbel.

[0037] The above-mentioned shear sleeve 40 is made of high-performance alloy material, and the shear resistance of this material is greater than the shear resistance of M16 bolts. For example, 15CrMrMoVA steel is used as the raw material of the shear sleeve to manufacture a sleeve with stronger shear resistance. The shear strength of this material is 813, which is much higher than the shear strength of ordinary carburized 45 steel bolts (whose shear strength is 370).

[0038] Furthermore, there are two connecting vertical plates 12 in the above-mentioned corbel, and a space for supporting the web of the steel beam is formed in the middle, and expansion holes are provided on the above-mentioned connecting vertical plates and the web of the steel beam.

[0039] Furthermore, the number of connecting vertical plates on the corbel is one.

[0040] Furthermore, the above-mentioned connecting vertical plate 12 has an arc-shaped profile, and a plurality of expanded holes are arranged between the connecting vertical plate and the web of the steel beam to form an expanded hole group. Preferably, the expanded hole group is arranged in a circular square array.

[0041] Furthermore, a nylon mesh gasket 50 is provided at the joint surface of the web and the connecting vertical plate. As required, the nylon mesh gasket may not be provided. Figure 4 .

[0042] The installation process is to dock the above-mentioned connecting vertical plate and steel beam, observe that the expanded hole in the center of the web is aligned with the expanded hole in the center of the connecting vertical plate, insert a shear sleeve into the alignment hole, and use a hammer to knock it into the expanded hole to achieve the initial positioning of the two. Then insert the shear sleeves into the remaining expanded holes one by one until the initial connection of all expanded holes is completed. Finally, insert a torsion-resistant high-strength bolt or ordinary bolt into each shear sleeve, and tighten it with gaskets and nuts. After tightening, the above-mentioned shear sleeve is confined in the above-mentioned expanded hole under the limiting action of the gaskets on both sides. When the steel beam is pulled or pressed relative to the corbel, the pulling and pressing generates shear force on the shear sleeve. Since the shear strength of the shear sleeve is far superior to the existing high-strength bolts and ordinary bolts, the shear performance of the connection node position is improved.

[0043] The matching accuracy between the above-mentioned shear sleeve and the connecting bolt is much higher than the matching accuracy between the bolt and the bolt hole of a general steel structure, so the shear sleeve disperses the shear force received, that is, the shear force received by the connecting bolt is smaller.

[0044] It can be seen from the description of this embodiment that the implementation of this new structure significantly improves the shear resistance of the steel structure beam-column connection node without significantly increasing the cost.

[0045] In this embodiment, in order to ensure the friction between the connecting vertical plate and the web after tightening, the total length of the shear sleeve is slightly smaller than the total length of the expanded hole between the connecting vertical plate and the web, that is, after tightening, there should be no contact stress between the two sides of the shear sleeve and the bolt head, bolt cap or bolt gasket.

[0046] Embodiment 2

[0047] The difference between this embodiment and the first embodiment is that the shear sleeve in this embodiment is part of the connecting bolt. Specifically, the shear sleeve is pre-set on the bolt. This embodiment discloses a method for sleeve processing of the shear sleeve and the bolt. First, the shear sleeve is heated to about 200 degrees by flame heating or oil bath heating, and then quickly sleeved on the connecting bolt. If the bolt is a stud bolt, it is sleeved in the center. If the bolt is a single-head bolt, it is sleeved at the root of the bolt. When the shear sleeve is cooled, it is tightly sleeved on the bolt, which is more convenient for installation and use.

[0048] The installation process of this embodiment is to dock the above-mentioned connecting vertical plate and steel beam, observe that the expanded hole at the center of the web plate is aligned with the expanded hole at the center of the connecting vertical plate, insert a connecting bolt (with a shear sleeve) into the aligned hole, and use a hammer to knock it into the expanded hole to achieve the initial positioning of the two. Then, insert the connecting bolts (with a shear sleeve) into the remaining expanded holes one by one until the initial connection of all expanded holes is completed. Finally, tighten the nuts of all bolts one by one to complete the installation.

[0049] refer to Figure 5 Different from the first embodiment, the shear sleeve in this embodiment is shuttle-shaped, that is, it has a pointed end. This shuttle-shaped structure has a positive significance for quick installation, that is, when the shear sleeve is inserted into the enlarged hole, it can be automatically aligned and the penetration efficiency is improved.

[0050] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements to the present invention by relevant technical personnel in the field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. The connection node of the assembled reinforced concrete column and the steel beam comprises a reinforced concrete column and a steel beam, wherein the reinforced concrete column and the steel beam are connected by a corbel transition, and is characterized in that: The connecting vertical plate of the corbel and the web of the steel beam are overlapped and aligned bolt holes are provided at the overlapped joints. Shear sleeves and high-strength bolts are sequentially arranged in the enlarged holes of the bolt holes after expansion, wherein the shear sleeves are high-performance alloy sleeves whose shear strength is greater than that of the high-strength bolts.

2. The connection node between the assembled reinforced concrete column and the steel beam according to claim 1, characterized in that: The shear-resistant sleeve is a chromium-manganese alloy forged sleeve.

3. The connection node between the assembled reinforced concrete column and the steel beam according to claim 1, characterized in that: There are two connecting vertical plates in the corbel, and a space is formed in the middle to support the web plate in the steel beam.

4. The connection node between the assembled reinforced concrete column and the steel beam according to claim 1, characterized in that: The number of the connecting vertical plate on the corbel is one.

5. The connection node between the assembled reinforced concrete column and the steel beam according to claim 1, characterized in that: The connecting vertical plate has an arc-shaped profile, and a group of expanded holes is arranged between the connecting vertical plate and the web.

6. The connection node between the assembled reinforced concrete column and the steel beam according to claim 5, characterized in that: The expansion hole groups are arranged in a circular array.

7. The connection node between the assembled reinforced concrete column and the steel beam according to claim 1, characterized in that: A nylon mesh cloth gasket is arranged at the fitting surface between the web and the connecting vertical plate.

8. The connection node between the assembled reinforced concrete column and the steel beam according to claim 1, characterized in that: The total length of the shear sleeve is less than the total length of the expansion channel connecting the vertical plate and the web plate.

9. The connection node between the assembled reinforced concrete column and the steel beam according to claim 1, characterized in that: The shear sleeve is fixed on the high-strength bolt by a mechanical method of heating and sleeve placement.

10. The connection node between the assembled reinforced concrete column and the steel beam according to claim 1, characterized in that: The shear-resistant sleeve is straight-cylindrical or shuttle-shaped.

Images