Steel structure exposed rigid connection column base suitable for shock resistance

Abstract

The utility model discloses a steel structure exposed type rigid connection column foot suitable for earthquake resistance, which comprises a concrete short column, a section steel column and a column bottom plate, a plurality of vertical stress ribs are embedded in the concrete short column, the column bottom plate is fixed on the top of the concrete short column, the section steel column is welded on the upper side of the column bottom plate, and the section steel column is welded on the lower side of the column bottom plate. A plurality of vertical stress ribs are arranged in the circumferential direction of the concrete short column at intervals, a plurality of high-strength bolts are vertically arranged on the column bottom plate in a penetrating mode, the strength of each high-strength bolt is the same as that of each vertical stress rib, each high-strength bolt is fixedly connected with one vertical stress rib through a grouting sleeve, and fine aggregate concrete materials are poured into the grouting sleeves. Different from a traditional rigid connection column base in the mode that force is indirectly transmitted through embedded foundation bolts, the rigid connection column base is directly connected with the high-strength bolts and the vertical stress ribs through the grouting sleeves, the force transmission path is clear, all the components are reliably connected, the anti-seismic performance requirement is met, the ultimate bearing capacity of a concrete short column can be fully exerted, and the service life of the concrete short column is prolonged. The method is suitable for various anti-seismic steel structures.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of steel structure construction, specifically relates to a steel structure exposed rigid joint column foot suitable for earthquake resistance. BACKGROUND

[0002] In the field of petrochemical industry, there are many steel structure constructions, and the exposed column foot is widely used in engineering due to factors such as construction period and soilless construction requirements. The exposed rigid joint column foot refers to the pre-buried foot bolts in the concrete stub column, and the steel column bottom plate is connected with the concrete stub column through the foot bolts after the steel column is in place. The exposed rigid joint column foot has the advantages of simple structure and short construction period. However, for structures with seismic performance requirements, the existing form of steel column foot is difficult to meet the ultimate bearing capacity required by the principle of "strong node and weak component". The main reason is that the foot bolt has low strength and has requirements such as edge distance and spacing, so the arrangement space and number of foot bolts are limited, and the ultimate strength of the concrete stub column cannot be fully utilized, so it is difficult to meet the ultimate bearing capacity requirement matching the steel column in engineering design, that is, the ultimate bearing capacity of the column foot node is greater than the product of the ultimate bearing capacity of the steel column and the safety factor.

[0003] CN 216428793 U discloses an exposed foot bolt type steel column foot connection structure, which increases the strength and connection stiffness of the steel column structure by reserving a connecting groove in the concrete stub column and arranging connecting members such as stiffening ribs and stiffening plates in the connecting groove to increase the contact surface between the column bottom and the concrete stub column. This steel column foot connection structure aims to increase the contact surface between the column bottom and the concrete stub column, but it does not effectively improve the stress state of the foot bolt, and cannot solve the problem of ultimate bearing capacity under seismic requirements.

[0004] CN 211973557 U relates to an exposed rigid joint column foot node, which increases the bending bearing capacity of the column foot node by arranging a reinforcing plate on the steel column, and strengthens the design of the anchor part buried underground to realize that the bearing capacity of the anchor part is not less than the bearing capacity of the steel column, the node is safe and reliable, the size of the exposed node is reduced, and the matching performance is good when connected with the enclosure system structure. However, this rigid joint column foot node changes the bolt connection to pre-buried steel plates, and then the steel column is welded with the steel plates. This form of node is only suitable for simple structures in engineering, and the steel column section is very small. The problems of this form of node are that the welding deformation of the pre-buried plate cannot be controlled, the flatness cannot be guaranteed, and the bending resistance and seismic performance are poor. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a steel structure exposed rigid joint column foot suitable for earthquake resistance according to the deficiencies of the prior art. The load transmission path of the rigid joint column foot is clear, the connection between the components is reliable, the seismic performance requirement is met, the ultimate bearing capacity of the concrete stub column can be fully utilized, and the steel structure construction suitable for various seismic requirements.

[0006] The utility model discloses a technical scheme adopted for solving the above technical problem is: a kind of exposed rigid joint column foot suitable for anti-seismic, including concrete stub column, shaped steel column and column bottom plate, the concrete stub column is embedded with several vertical force bars, the column bottom plate is fixed at the top of the concrete stub column, the shaped steel column is welded in the upside of the column bottom plate, the vertical force bars are spaced apart along the circumference of the concrete stub column, several high-strength bolts are vertically provided on the column bottom plate, the strength of each high-strength bolt is same with each vertical force bar, the high-strength bolt is fixedly connected with the vertical force bar by grouting sleeve, and the grouting sleeve is filled with fine stone concrete material.

[0007] The utility model discloses rigid joint column foot replaces traditional structure in the bulky foot bolt by high-strength bolt, and several high-strength bolts are fixedly connected with several vertical force bars by grouting sleeve, and fine stone concrete material is filled in grouting sleeve, realize the connection between high-strength bolt, grouting sleeve and vertical force bar, guarantee the reliability of connection, reach the requirement of anti-seismic performance, and can give full play to the ultimate bearing capacity of concrete stub column.

[0008] As preferred, the grouting sleeve includes several middle three-way grouting sleeves and four corner grouting sleeves which are integrated and internally communicated, one corner grouting sleeve is arranged at each corner of the top of the concrete stub column, a plurality of middle three-way grouting sleeves are arranged between the adjacent two corner grouting sleeves, each corner grouting sleeve includes a first bolt sleeve and a first steel sleeve which are internally communicated, each three-way grouting sleeve includes a second bolt sleeve, a sleeve connecting piece and two second steel sleeves which are internally communicated, the inner diameter and strength of each first bolt sleeve and each second bolt sleeve are matched with each high-strength bolt, the inner diameter and strength of each first steel sleeve and each second steel sleeve are matched with each vertical force bar, each first bolt sleeve and each second bolt sleeve are respectively sleeved at the bottom of one high-strength bolt, and each first steel sleeve and each second steel sleeve are respectively sleeved at the top of one vertical force bar. The design of the above middle three-way grouting sleeve makes the arrangement of high-strength bolts not too dense, while realizing the reliable connection between high-strength bolts and vertical force bars, the several middle three-way grouting sleeves and four corner grouting sleeves are integrated and internally communicated, which can realize the overall one-time grouting of all grouting sleeves, and is beneficial to reducing construction period and improving construction efficiency.

[0009] As preferred, the top of each of the first bolt sleeve is provided with a first grout outlet, the bottom of each of the first steel sleeve is provided with a first grouting port, the top of each of the second bolt sleeve is provided with a second grout outlet, the bottom of one of the second steel sleeves in each of the middle three-way grouting sleeve is provided with a second grouting port, the two second steel sleeves in each of the middle three-way grouting sleeve are communicated through horizontal grouting connecting pipes, the first grouting port of one of the four corner grouting sleeves is connected with a grouting port extension pipe, the first grout outlet of the middle three-way grouting sleeve adjacent to the corner grouting sleeve connected with the grouting port extension pipe is connected with a grout outlet extension pipe, and the grouting sleeves at the remaining positions are communicated through head-to-tail grouting connecting pipes.

[0010] As preferred, the grouting port extension pipe and the grout outlet extension pipe are pre-buried in the concrete short column, and the outer ends of the grouting port extension pipe and the grout outlet extension pipe respectively extend out of the outer surface of the concrete short column.

[0011] As preferred, a secondary grouting layer is arranged between the column bottom plate and the top of the concrete short column, so as to further improve the reliability of the rigidly connected column foot overall structure.

[0012] As preferred, a plurality of column bottom stiffening ribs are welded between the bottom of the shaped steel column and the column bottom plate, so as to further enhance the effect.

[0013] Compared with the prior art, the rigidly connected column foot of the utility model has the following advantages: different from the traditional rigidly connected column foot which indirectly transmits force through pre-buried foundation bolts, the rigidly connected column foot of the utility model directly connects high-strength bolts and vertical load-bearing bars through grouting sleeves, the force transmission path is clear, the connection between the components is reliable, the seismic performance requirement is met, the ultimate bearing capacity of the concrete short column can be fully utilized, and the utility model is suitable for various seismic steel structures. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is an appearance schematic view of the rigidly connected column foot of the steel structure suitable for seismic resistance in the embodiment;

[0015] Fig. 2 It is an effect schematic view of the connection between the vertical load-bearing bar and the middle three-way grouting sleeve and the corner grouting sleeve in the embodiment;

[0016] Fig. 3This is a schematic diagram showing the external appearance of the corner grouting sleeve, the middle tee grouting sleeve, and the beginning and end grouting connecting pipes in the embodiment.

[0017] The specific reference numerals in the figure are as follows:

[0018] 1-Concrete short column, 11-Vertical reinforcing bar, 12-Secondary grouting layer, 2-Steel column, 21-Column base plate, 22-Column base stiffening rib, 3-High-strength bolt, 4-Middle tee grouting sleeve, 41-Second bolt sleeve, 42-Second reinforcing bar sleeve, 43-Sleeve connector, 44-Second grout outlet, 45-Second grouting port, 46-Horizontal grouting connection pipe, 47-Grouting outlet extension pipe, 48-First and last grouting connection pipe, 5-Corner grouting sleeve, 51-First bolt sleeve, 52-First reinforcing bar sleeve, 53-First grout outlet, 54-First grouting port, 55-Grouting port extension pipe. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] The embodiment is applicable to exposed rigid-joint column bases of seismic-resistant steel structures, such as... Figs. 1-3 As shown, the structure includes a concrete short column 1, a steel column 2, and a column base plate 21. Several vertical reinforcing bars 11 are embedded in the concrete short column 1. The column base plate 21 is fixed to the top of the concrete short column 1. A secondary grouting layer 12 is provided between the column base plate 21 and the top of the concrete short column 1. The steel column 2 is welded to the upper side of the column base plate 21. Several column base stiffening ribs 22 are welded between the bottom of the steel column 2 and the column base plate 21. Several vertical reinforcing bars 11 are arranged at intervals along the circumference of the concrete short column 1. Several high-strength bolts 3 are vertically inserted through the column base plate 21. Each high-strength bolt 3 has the same strength as each vertical reinforcing bar 11. Several high-strength bolts 3 are fixedly connected to several vertical reinforcing bars 11 through grouting sleeves. Fine stone concrete material is poured into the grouting sleeves.

[0021] In the embodiment, the grouting sleeve comprises a plurality of middle three-way grouting sleeves 4 and four corner grouting sleeves 5 which are connected as a whole and communicate with each other, one corner grouting sleeve 5 is arranged at each corner of the top of the concrete short column 1, a plurality of middle three-way grouting sleeves 4 are arranged at intervals between every two adjacent corner grouting sleeves 5, each corner grouting sleeve 5 comprises a first bolt sleeve 51 and a first steel sleeve 52 which communicate with each other, each three-way grouting sleeve 4 comprises a second bolt sleeve 41, a sleeve connecting piece 43 and two second steel sleeves 42 which communicate with each other, the inner diameter and strength of each first bolt sleeve 51 and each second bolt sleeve 41 are matched with each high-strength bolt 3, the inner diameter and strength of each first steel sleeve 52 and each second steel sleeve 42 are matched with each vertical load-bearing bar 11, each first bolt sleeve 51 and each second bolt sleeve 41 are sleeved at the bottom of one high-strength bolt 3 respectively, and each first steel sleeve 52 and each second steel sleeve 42 are sleeved at the top of one vertical load-bearing bar 11 respectively.

[0022] In the embodiment, the top of each first bolt sleeve 51 is provided with a first grouting outlet 53, the bottom of each first steel sleeve 52 is provided with a first grouting inlet 54, the top of each second bolt sleeve 41 is provided with a second grouting outlet 44, the bottom of one second steel sleeve 42 in each middle three-way grouting sleeve 4 is provided with a second grouting inlet 45, two second steel sleeves 42 in each middle three-way grouting sleeve 4 are connected and communicated through a horizontal grouting connecting pipe 46, the first grouting inlet 54 of one corner grouting sleeve 5 of the four corner grouting sleeves 5 is connected with a grouting inlet extension pipe 55, the first grouting outlet 53 of one middle three-way grouting sleeve 4 adjacent to the corner grouting sleeve 5 connected with the grouting inlet extension pipe 55 is connected with a grouting outlet extension pipe 47, the remaining adjacent grouting sleeves are connected and communicated through head-to-tail grouting connecting pipes 48, the grouting inlet extension pipe 55 and the grouting outlet extension pipe 47 are embedded in the concrete short column 1 respectively, and the outer ends of the grouting inlet extension pipe 55 and the grouting outlet extension pipe 47 respectively extend out of the outer surface of the concrete short column 1.

[0023] The rigid column foot described above replaces the bulky foundation bolt in the traditional structure with high-strength bolts, fixes and connects the high-strength bolts and the vertical load-bearing bars through the grouting sleeve, pours fine stone concrete material in the grouting sleeve, realizes the connection among the high-strength bolts, the grouting sleeve and the vertical load-bearing bars, guarantees the reliability of the connection, meets the requirement of the anti-seismic performance, and can fully exert the ultimate bearing capacity of the concrete short column.

Claims

1. An exposed rigid-joint column base for seismic-resistant steel structures, comprising a short concrete column, a steel column, and a column base plate, wherein the short concrete column has a plurality of vertical reinforcing bars embedded therein, the column base plate is fixed to the top of the short concrete column, and the steel column is welded to the upper side of the column base plate, characterized in that... The several vertical force bars are arranged along the circumference of the concrete short column, the column bottom plate is vertically provided with several high-strength bolts, the strength of each high-strength bolt is same as that of each vertical force bar, the several high-strength bolts are fixedly connected with the several vertical force bars through the grouting sleeves, and the grouting sleeves are filled with fine stone concrete material.

2. The exposed rigid connection column base for seismic resistance according to claim 1, wherein The grouting sleeve comprises several middle three-way grouting sleeves and four corner grouting sleeves which are integrated and internally communicated, one corner grouting sleeve is arranged at each corner of the top of the concrete short column, a plurality of middle three-way grouting sleeves are arranged between the adjacent two corner grouting sleeves, each corner grouting sleeve comprises a first bolt sleeve and a first steel sleeve which are internally communicated, each three-way grouting sleeve comprises a second bolt sleeve, a sleeve connecting piece and two second steel sleeves which are internally communicated, the inner diameter and the strength of each first bolt sleeve and each second bolt sleeve are matched with each high-strength bolt, the inner diameter and the strength of each first steel sleeve and each second steel sleeve are matched with each vertical force bar, each first bolt sleeve and each second bolt sleeve are respectively sleeved at the bottom of one high-strength bolt, and each first steel sleeve and each second steel sleeve are respectively sleeved at the top of one vertical force bar.

3. The exposed rigid connection column base for seismic resistance according to claim 2, wherein The top of each first bolt sleeve is provided with a first grouting outlet, the bottom of each first steel sleeve is provided with a first grouting inlet, the top of each second bolt sleeve is provided with a second grouting outlet, the bottom of one second steel sleeve in each middle three-way grouting sleeve is provided with a second grouting inlet, the two second steel sleeves in each middle three-way grouting sleeve are communicated through a horizontal grouting connecting pipe, the first grouting inlet of one corner grouting sleeve of the four corner grouting sleeves is connected with a grouting inlet extension pipe, the first grouting outlet of a middle three-way grouting sleeve adjacent to the corner grouting sleeve connected with the grouting inlet extension pipe is connected with a grouting outlet extension pipe, and the adjacent grouting sleeves at the remaining positions are communicated through head-tail grouting connecting pipes.

4. The exposed rigid connection column base for seismic resistance according to claim 3, wherein The grouting inlet extension pipe and the grouting outlet extension pipe are respectively embedded in the concrete short column, and the outer ends of the grouting inlet extension pipe and the grouting outlet extension pipe respectively extend out of the outer surface of the concrete short column.

5. The exposed rigid connection column base for seismic resistance according to claim 1, wherein A secondary grouting layer is arranged between the column bottom plate and the top of the concrete short column.

6. The exposed rigid connection column base for seismic resistance according to claim 1, wherein A plurality of column bottom stiffening ribs are welded between the bottom of the shaped steel column and the column bottom plate.

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