CN112302176B

CN112302176B - Core barrel flange closed section column connecting node with cover plate, connecting method and flange plate design method

Info

Publication number: CN112302176B
Application number: CN202011308542.7A
Authority: CN
Inventors: 张爱林; 张艳霞; 武丙龙; 黄哲文
Original assignee: Beijing University of Civil Engineering and Architecture
Current assignee: Beijing University of Civil Engineering and Architecture
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2022-04-12
Anticipated expiration: 2040-11-20
Also published as: CN112302176A

Abstract

The invention relates to the technical field of assembled steel structures, and particularly discloses a core barrel flange closed section column connecting node with a cover plate, a connecting method and a flange plate design method. The connection node includes: no. 1 tubular column, No. 2 tubular column, core barrel and bolt apron. The end surface of the bottom of the No. 1 pipe column is provided with a No. 1 flange, and the end surface of the top of the No. 2 pipe column is provided with a No. 2 flange; the No. 1 flange and the No. 2 flange can be fixedly connected through flange bolts; be provided with one-way bolt hole on the column wall that is close to No. 1 flange on No. 1 tubular column, No. 1 tubular column and No. 2 tubular columns can be worn to establish by the core section of thick bamboo to can be connected through one-way high strength bolt technique through pore and No. 1 tubular column and bolt cover. The core barrel, the column wall and the bolt cover plate are connected through the one-way bolt, so that the performance of a connecting structure is ensured, meanwhile, due to the existence of the cover plate, the tension of the bolt can be effectively reduced, efficient assembly is realized, and welding is reduced; the core barrel and the column wall can work cooperatively through the one-way bolt holes.

Description

Core barrel flange closed section column connecting node with cover plate, connecting method and flange plate design method

Technical Field

The invention relates to the technical field of assembled steel structures, in particular to the technical field of core barrel flange closed section column joints.

Background

In recent years, the country and the government actively promote the development of the assembled steel structure building, realize the standardized design, the industrial production and the assembly construction of the assembled steel structure, and certainly become the development trend of the future Chinese building. The node is the key of modular steel structure building design, and the reliability of connection directly influences the overall performance of the structure. The closed section column is widely applied to steel structure buildings because the stress performance in two directions is good, the existing box column full penetration welding joint has the problems of low construction efficiency, high labor cost and environmental pollution due to field welding, low construction efficiency, high labor cost and environmental pollution under the action of an earthquake, serious damage, poor durability and the like due to the influence of welding stress under the action of the earthquake, welding in partial areas is limited and even forbidden, and the problems prevent the further development of an assembly type steel structure.

Disclosure of Invention

The invention aims to provide a core barrel flange closed section column connecting node with a cover plate, a connecting method and a flange plate design method. The method aims to solve the problems that in the prior art, the on-site welding of the box column full penetration welding joint is low in construction efficiency, high in labor cost, environment-friendly and the like. Many scholars have already conducted research in this respect, and have obtained many research results, but most nodes have realized high-efficient assembly, but the node can't realize the effect of being connected with full penetration welding unanimity, and this node not only can realize above-mentioned target, can also not take place the bolt breakage and become invalid when the node receives very big pulling force.

In order to solve the above technical problem, the present invention provides a core barrel flange closed cross-section column connection node with a cover plate, which is used for an assembly type steel structure, and comprises: the device comprises a No. 1 pipe column, a No. 2 pipe column, a core barrel and a bolt cover plate;

the end face of the lower part of the No. 1 pipe column is provided with a No. 1 flange, the end face of the upper part of the No. 2 pipe column is provided with a No. 2 flange, and the No. 1 flange and the No. 2 flange can be fixedly connected through bolts to form flange connection;

one or more one-way bolt holes are formed in the column wall, close to the flange No. 1, of the column No. 1; one or more one-way bolt holes corresponding to the No. 1 pipe column are formed in the wall of the core barrel; one or more one-way bolt holes corresponding to the No. 1 pipe column and the core barrel are formed in the bolt cover plate; the core barrel penetrates through the No. 1 tubular column and the No. 2 tubular column and is connected with the No. 1 tubular column and the bolt cover plate through one-way bolts through one-way bolt holes in the core barrel, the No. 1 tubular column and the bolt cover plate.

Preferably, the bolt cover plate is a separate cover plate or an integral annular cover plate.

Preferably, the No. 1 tubular column and the No. 2 tubular column are vertical component columns.

Preferably, the one-way bolt is a self-locking one-way bolt.

Preferably, installation partition plates are arranged in the column walls of the No. 1 column and/or the No. 2 column.

Preferably, an installation partition plate is arranged in the column wall of the No. 1 column, and the core barrel penetrates through the inner wall of the No. 1 column and keeps a distance of not more than 15mm with the installation partition plate in the No. 1 column.

Preferably, the core cylinder is an octagonal core cylinder, the cross section of the core cylinder is formed by welding eight steel plates, or the core cylinder is formed by directly cold-bending a circular tube.

Preferably, an installation partition plate is arranged in the column wall of the No. 2 column, and the core barrel is integrally formed with the No. 2 column by welding eight steel plates with the column wall of the No. 2 column and the installation partition plate in sequence.

In order to solve the technical problem, the invention also provides a connecting method of the core barrel flange closed section column connecting joint with the cover plate, the design method considers bending moments in two directions for the first time, and the method comprises the following steps:

step 1, hoisting a No. 2 pipe column in place;

step 2, hoisting the No. 1 pipe column, and enabling the core barrel to penetrate into the pipe column and align to the one-way bolt hole in the wall of the No. 1 pipe column and the one-way bolt hole in the core barrel;

step 3, fixedly connecting

flanges

1 and 2 on two end faces of the column 1 and the column 2 through flange bolts;

step 4, hoisting the steel beam, and mounting a connecting plate on the flange of the steel beam;

step 5, hoisting the bolt cover plate;

step 6, connecting the bolt cover plate with the flange of the steel beam by enabling a high-strength bolt to penetrate through a high-strength bolt hole in the bolt cover plate;

and 7, fixedly connecting the core barrel, the No. 1 tubular column and the bolt cover plate through a one-way bolt.

In order to provide a theoretical basis for the technical problems, the invention also provides a method for designing the flange plate in the core barrel flange closed section column connecting node with the cover plate, which comprises the following steps:

the method comprises the following steps that firstly, the design analysis of a structure system under the action of multiple earthquakes is carried out on the internal force of each component of the structure by using finite element software, and the internal force at the splicing node of the pipe column under each working condition is obtained, wherein the internal force comprises bending moments Mx and My in two directions x and y which are orthogonal to each other and column axial force N, and the three internal forces are total;

step two, calculating the thickness of the flange plate:

in the flange design method, the bending moments in two directions are used for checking calculation for the first time, after the section of a pipe column in a structural system is determined according to the internal force under the working condition of multiple earthquakes, the thickness of a flange plate is calculated according to the formulas (1), (2) and (3):

in the formulae (1), (2) and (3), T_bThe tension in the pipe wall section corresponding to the bolt; n is the total number of bolts on the tension side of the flange; n is₀The total number of the flange bolts; m_x、M_yThe combined bending moment values of the column around the x axis and the y axis under the action of the earthquake are respectively; w_x、W_yRespectively the cross section resisting moment of the column in the x-axis direction and the y-axis direction; b is_x、B_yThe lengths of the X-axis and the Y-axis of the tubular column are respectively; n is a designed value of the axial force of the pipe column which is combined with the bending moment in the same way; x is the number of_i，y_iThe distance from the ith flange bolt to the vertical central shaft and the horizontal central shaft is set; t is the thickness of the flange plate; t is t_cIs the thickness of the flange plate; f is the strength of the flange plate; s is the minimum bolt spacing; a is the distance from the bolt hole to the edge of the flange plate; b is the distance from the bolt hole to the column wall.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects: according to the core barrel flange closed section column connecting node with the cover plate, on the basis that the connection performance between columns is close to the mechanical performance of traditional welding connection, the flange plate and the core barrel are adopted, industrial production is facilitated, tight connection between the core barrel and the column wall is guaranteed in a one-way bolt mode, the structural performance is guaranteed, efficient assembly of the structure is achieved, full bolt connection on a construction site is achieved, and construction progress is effectively accelerated. Meanwhile, due to the existence of the bolt cover plate, the situation that the bolt tension is large due to the arrangement of the structure can be effectively avoided, the bolt tension is counteracted mainly by applying a pre-pressure to the bolt, and the requirement on the machining precision of the core barrel and the column wall is lowered to a certain extent by arranging the one-way bolt hole.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic structural diagram illustrating an assembled state of a closed cross-section column connection node of a core barrel flange with a cover plate according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a partially assembled state of one embodiment of a blind cross-sectional column joint of a covered cartridge flange provided in an example of the present application;

FIG. 3 illustrates a method of integrally forming a cartridge according to the present invention;

FIG. 4 is a separate processing method of the core barrel by using a tool according to the present invention;

FIG. 5 is a schematic view of a core-tube separated processing method using circular tube cold-bending forming according to the present invention;

FIG. 6 is a schematic structural diagram of a construction of a bolt cover plate according to an embodiment of the present disclosure;

fig. 7 is a flowchart of a connection method of a connection node of a closed-section column of a flange of a cartridge with a cover plate according to an embodiment of the present application.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for the convenience of description of the present application, and have no specific meaning by themselves. Thus, "module", "component" or "unit" may be used mixedly.

In the description of the present application, "a plurality" means two or more unless otherwise specified. The terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present patent and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "node" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art.

Referring to fig. 1 to 6, a closed-section column connection node of a cartridge flange with a cover plate provided in an embodiment of the present application includes: no. 1 tubular column, No. 2 tubular column 9, bolt cover plate 5 and core barrel 12. It should be understood that the connection structure of the embodiment of the present application is illustrated as a box section column, which is merely an exemplary illustration, and is not particularly limited to a box section column, and may be applied to a closed section column such as a steel pipe column, a square steel pipe column, a round pipe column, or the like.

In the embodiment of the application, the lower end face of the No. 1 pipe column is provided with a No. 1 flange 8, and the upper end face of the No. 2 pipe column 9 is provided with a No. 2 flange 7. No. 1 flange 8 and No. 2 flange 7 can form the first connection between No. 1 tubular column 1 and No. 2 tubular column 9 through a plurality of flange bolts 11 fixed connection.

In the embodiment of the application, a plurality of one-way bolt holes 16 are formed in the column wall, close to the flange 8 No. 1, of the column 1; the wall of the core barrel 12 is provided with a plurality of one-way bolt holes 15 corresponding to the No. 1 pipe column; the bolt cover plate 5 is provided with a one-way bolt hole 18 corresponding to the No. 1 pipe column 1 and the core barrel 12. The core barrel 12 can be arranged in the No. 1 tubular column and the No. 2 tubular column 9 in a penetrating mode, and can be connected with the No. 1 tubular column and the bolt cover plate 5 through the one-

way bolt holes

15, 16 and 18 through the one-way bolt 4 to form second connection between the core barrel 12 and the No. 1 tubular column and the No. 2 tubular column 9. The core barrel 12 ensures that the connecting structure is rigidly connected, the rigidity of the connecting area is increased, and meanwhile, due to the existence of the bolt cover plate 5, the tensile force of the bolt is reduced, and the bearing capacity of the node is enhanced. The bolt cover plate 5 may be a separate cover plate or an integral annular cover plate. The one-way bolt 4 can be a self-locking one-way bolt, and can be directly constructed outside the column wall, so that the wall of the core tube, the column wall of the No. 1 tube column and the wall of the bolt cover plate are tightly attached.

In some embodiments, the column walls of the No. 1 and No. 2 tubular columns 9 are provided with mounting

spacers

3 and 10, respectively, which can position the lower half of the cartridge 12 in the No. 2 tubular column 9 with the one-way bolt holes overlapping, and then the bolt cover plates are mounted so that the three one-way bolt holes coincide.

In certain embodiments, a plurality of flange bolts 11 are provided between flange No. 18 of column No. 1 and between column No. 2 and flange No. 2 7. A plurality of strengthening ribs set up in the outside of 1 # tubular column and 2 # tubular column, the construction of being convenient for. The number and size of the flange bolts 11 are determined by the size of the No. 1 pipe column and the No. 2 pipe column 9. The flange bolts 11 can increase rigidity and protect the weld between the cylinder and the flange plate.

In some embodiments, referring to FIG. 4, the core barrel 12 is an octagonal core barrel with a cross-section formed by welding eight steel plates; as shown in fig. 5, the core barrel 12 can also be formed by direct cold-bending a circular tube; as shown in fig. 3, the core barrel 12 may be integrally formed with the lower column by welding eight steel plates to the column wall and the mounting partition plate in this order.

In certain embodiments, tubular strings No. 1 and No. 2, 9 are vertical member strings. Referring to fig. 1 to 3, a column 1 is an upper column, and a column 2 is a lower column, and 9. Referring to fig. 1 and 2, a column 1 is provided with a mounting spacer 3.

Fig. 7 is a flowchart of a connection method of a connection node of a closed-section column of a flange of a cartridge with a cover plate according to an embodiment of the present application, and as shown in fig. 7, the connection method includes steps 1 to 7.

Step 1, hoisting the No. 2 pipe column 9 in place.

Step 2, hoisting the No. 1 tubular column 1, and simultaneously aligning the one-way bolt hole 16 on the wall of the No. 1 tubular column and the one-way bolt hole 15 on the core barrel inside the core barrel penetrating into the tubular column.

And step 3, fixedly connecting the

flanges

8 and 7 on the two end faces of the pipe column 1 and the pipe column 2 through the flange bolts 11, wherein the

flanges

8 and 7 are arranged on the two end faces of the pipe column 1 and the pipe column 2.

And 4, hoisting the steel beam 2, and installing connecting plates 13 and 14 (shown in reference to figures 1 and 2) on the flange of the steel beam 2.

And 5, hoisting the bolt cover plate 5.

And 6, connecting the bolt cover plate 5 with the flange of the steel beam 2 by enabling the high-strength bolts 6 to penetrate through the high-strength bolt holes 17 in the bolt cover plate 5 (shown in reference to fig. 1, 2 and 6).

And 7, fixedly connecting the core barrel 12, the No. 1 pipe column 1 and the bolt cover plate 5 through the one-way bolt 4.

In some implementations, the above step numbers are used as an exemplary illustration, and are also used to limit the order of the steps in the embodiments of the present application, for example: since the installation of the bolted cover plates must be completed after the hoisting of the steel beams is completed, otherwise the installation is no longer possible after the bolts are tightened.

In some embodiments, in the step 2, the core barrel 12 is inserted into the inner wall of the No. 1 pipe column 1 and keeps a distance of 15mm from the installation partition plate 3 in the No. 1 pipe column 1, so that the one-way bolt hole 15 in the upper half part of the barrel wall of the core barrel 12 is overlapped with the one-way bolt hole 16 of the No. 1 pipe column 1.

In certain embodiments, the number 1 string 1, the number 2 string 9, and the core barrel 12 may be conventional strength grade steel (e.g., Q355, etc.), or high performance steel (e.g., Q420). The embodiment of the present application does not limit this.

The method for designing the flange plate in the core barrel flange closed section column connecting node with the cover plate comprises the following steps:

step two, calculating the thickness of the flange plate:

after the section of the pipe column in the structural system is determined according to the internal force under the working conditions of multiple earthquakes, the thickness of the flange plate is calculated according to the formulas (1), (2) and (3):

in the formulae (1), (2) and (3), T_bThe tension in the pipe wall section corresponding to the bolt; n is the total number of bolts on the tension side of the flange(ii) a n0 is the total number of flange bolts; m_x、M_yThe combined bending moment values of the column around the x axis and the y axis under the action of the earthquake are respectively; w_x、W_yRespectively the cross section resisting moment of the column in the x-axis direction and the y-axis direction; b is_x、B_yThe lengths of the X-axis and the Y-axis of the tubular column are respectively; n is a designed value of the axial force of the pipe column which is combined with the bending moment in the same way; xi, yi is the distance from the ith flange bolt to the vertical central shaft and the horizontal central shaft; t is the thickness of the flange plate; tc is the flange plate thickness; f is the strength of the flange plate; s is the minimum bolt spacing; a is the distance from the bolt hole to the edge of the flange plate; b is the distance from the bolt hole to the column wall.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: this connection structure, on the basis that connection performance and traditional welded connection's mechanical properties are close between the vertical component post of assurance box cross-section and the post, adopt flange plate and core section of thick bamboo the industrialization production of being convenient for, and the mode with one-way bolt has guaranteed being connected of core section of thick bamboo and column wall, and simultaneously, the bolt apron of increase can effectively reduce the bolt pulling force, the bearing capacity of node has been improved, connection structure's performance has been guaranteed, the high-efficient assembly of structure has been realized, welding has greatly been reduced, the effectual construction progress that has accelerated. And through setting up one-way bolt hole, reduced the machining precision requirement of core section of thick bamboo and column wall to a certain extent.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a take core section of thick bamboo flange closed cross-section post connected node of apron for assembled steel construction, its characterized in that, it includes: the device comprises a No. 1 pipe column, a No. 2 pipe column, a core barrel and a bolt cover plate;

the end face of the lower part of the No. 1 pipe column is provided with a No. 1 flange, the end face of the upper part of the No. 2 pipe column is provided with a No. 2 flange, and the No. 1 flange and the No. 2 flange can be fixedly connected through flange bolts to form flange connection;

one or more one-way bolt holes are formed in the column wall, close to the flange No. 1, of the column No. 1; one or more one-way bolt holes corresponding to the No. 1 pipe column are formed in the wall of the core barrel;

the lower part of the No. 2 flange of the No. 2 pipe column is provided with a short beam section vertical to the column body of the No. 2 pipe column;

the bolt cover plate comprises four parts: a vertical portion parallel to the column of the No. 1 pipe column, a shorter horizontal portion parallel to the No. 1 flange, a longer horizontal portion parallel to the short beam section of the No. 2 pipe column, and a connecting portion connecting the shorter horizontal portion and the longer horizontal portion;

one or more one-way bolt holes corresponding to the No. 1 pipe column and the core barrel are formed in the vertical part of the bolt cover plate; the core barrel penetrates through the No. 1 pipe column and the No. 2 pipe column and is connected with the No. 1 pipe column and the bolt cover plate through one-way bolts through one-way bolt holes in the vertical parts of the core barrel, the No. 1 pipe column and the bolt cover plate;

the one-way bolt is a self-locking one-way bolt;

the shorter horizontal portion of the bolt cover plate overlies the flange bolts;

the longer horizontal part of bolt apron is connected the short beam section and the girder steel of No. 2 tubular columns through high strength bolt.

2. A blind flange closed section column joint of claim 1 wherein said bolted cover is a split cover or an integral annular cover.

3. The covered core barrel flange closed section column connection node according to claim 1, wherein the number 1 tubular column and the number 2 tubular column are vertical member columns.

4. A flanged closed cross-section column connection node of a cartridge with a cover plate as claimed in claim 1, 2 or 3, wherein the column wall of the column No. 1 and/or the column No. 2 is provided with a mounting partition.

5. The blind flange closed section column connection node of claim 1, 2 or 3, wherein a mounting partition is provided in the column wall of column No. 1, and the cartridge is inserted into the inner wall of column No. 1 and is kept at a distance of not more than 15mm from the mounting partition in column No. 1.

6. A flange closed cross-section column connection node of a core barrel with a cover plate according to claim 1, 2 or 3, wherein the core barrel is an octagonal core barrel, the cross section is formed by welding eight steel plates, or the core barrel is formed by direct cold-bending a circular tube.

7. A flange closed section column connection node of a core barrel with a cover plate as claimed in claim 1, 2 or 3, wherein a mounting partition plate is arranged in the column wall of the No. 2 column, and the core barrel is integrated with the No. 2 column by welding eight steel plates with the column wall of the No. 2 column and the mounting partition plate in sequence.

8. A method of connecting a blind flanged closed section column connection node of a cartridge as claimed in claim 1, 2 or 3, comprising the steps of:

step 1, hoisting a No. 2 pipe column in place;

step 3, fixedly connecting flanges 1 and 2 on two end faces of the column 1 and the column 2 through flange bolts;

step 5, hoisting the bolt cover plate;

9. A method for designing a flange plate in a blind-ended cylindrical column connection node of a flange of a cartridge with a cover plate according to any one of claims 1 to 7, comprising the steps of:

step two, calculating the thickness of the flange plate:

in the formulae (1), (2) and (3), T_bThe tension in the pipe wall section corresponding to the bolt; n is the total number of bolts on the tension side of the flange; n0 is the total number of flange bolts; m_x、M_yThe combined bending moment values of the column around the x axis and the y axis under the action of the earthquake are respectively; w_x、W_yRespectively the cross section resisting moment of the column in the x-axis direction and the y-axis direction; b is_x、B_yThe lengths of the X-axis and the Y-axis of the tubular column are respectively; n is a designed value of the axial force of the pipe column which is combined with the bending moment in the same way; xi, yi is the distance from the ith flange bolt to the vertical central shaft and the horizontal central shaft; t is the thickness of the flange plate; tc is the column wall thickness; f is the strength of the flange plate; s is the minimum bolt spacing; a is the distance from the bolt hole to the edge of the flange plate; b is the distance from the bolt hole to the column wall.