1. The full-bolt connecting joint of the box-shaped beam column with the plastic hinge is characterized by comprising a box-shaped column, a cantilever box beam, a box-shaped beam and a connecting assembly; one end of the cantilever box girder is fixedly connected with one side of the box column, and the other end of the cantilever box girder is detachably connected with the box girder through the connecting component.

2. The all-bolt connection node for a box beam and column with a plastic hinge according to claim 1, wherein a reinforcing plate is provided between one end of the cantilever box beam and the box column, and one end of the reinforcing plate is inserted into the box column and welded to an inner wall of the box column.

3. The plastic hinged box beam-column all-bolt connection node as claimed in claim 1, wherein the cantilever box beam is provided with mounting holes and mounting bolt holes at one end, and the box beam is provided with mounting holes and mounting bolt holes at the end close to the cantilever box beam.

4. The plastic hinged box beam and column all-bolt connection node as claimed in claim 1, wherein when the connection assembly is a connection plate, the connection plate includes an inner connection plate and an outer connection plate, the inner connection plate being a connection plate with a nut.

5. The plastic hinged box beam and column all-bolt connection node as claimed in claim 4, wherein the inner connecting plate is a connecting plate using a pre-cast, swaged or welded nut.

6. The plastic hinged box beam-column all-bolt connection node as claimed in claim 4, wherein when the box beam is a welded box beam, the box beam and the cantilever box beam are provided with slide rails on their inner sides, and the inner connecting plate slides along the slide rails.

7. The fully bolted box beam column connection with plastic hinge as claimed in claim 1, wherein when the box beam is a rolled box beam, said connection assembly is a connecting box beam comprising an inner lining connecting box beam disposed inside said cantilever box beam and said box beam and an outer jacket connecting box beam nested outside said cantilever box beam and said box beam.

8. The plastic hinged box beam-column all-bolt connection node as claimed in claim 1, wherein the cantilever box beam or the box beam is provided with connection screw holes.

9. A method for connecting box-shaped beams and columns with plastic hinges through full bolts is characterized by comprising the following steps:

a prefabrication stage:

firstly, prefabricating a cantilever box girder, wherein the cantilever box girder and the box girder have the same specification, calculating and determining the number and the positions of bolt holes for connection according to the internal force of a node, determining the number and the positions of bolt holes for installation according to the installation requirement, and processing the bolt holes on the cantilever box girder; welding one end of the cantilever box girder with the wall plate of the box column; welding a reinforcing plate according to the stress and the structure to obtain a box column with the cantilever box girder;

secondly, prefabricating a connecting plate, calculating and determining the actual size and the number of connecting bolt holes according to the internal force of the node, and processing the connecting bolt holes on the connecting plate; or prefabricating the connecting box girder, calculating and determining the actual size and the number of the connecting bolt holes according to the internal force of the node, and processing the connecting bolt holes on the connecting box girder;

thirdly, prefabricating the box beam, calculating and determining the actual size and the number of bolt holes for connection according to the internal force of the node, and processing the bolt holes for connection at the end part of the box beam;

the first step, the second step and the third step are not implemented in sequence;

and (3) an installation stage:

when the connecting plate is adopted for installation, the implementation is carried out according to the requirements from the fourth step to the eleventh step:

fourthly, hoisting the box beam to the position of the cantilever box beam to keep a certain gap between the box beam and the cantilever box beam;

fifthly, removing temporary fixing bolts between a web plate and a connecting plate of the box girder, keeping bolts at the rotating center of the web plate, enabling bolt holes in the connecting plate on the outer side of the web plate to correspond to bolt holes in the box girder and the cantilever box girder through rotation, and temporarily fixing the connecting plate and the cantilever box girder through the bolts;

sixthly, removing a bolt at the rotating center of the web plate, and enabling a connecting plate at the inner side of the web plate to be in place through sliding;

seventhly, mounting all connecting bolts of the web plate;

eighthly, when the web plates on the two sides of the box beam are installed and fixed by the bolts, the hoisting equipment is removed;

ninthly, repeating the fifth step to the eighth step, and installing a connecting plate of the box beam and the cantilever box beam flange;

tenth, after all connecting bolts are installed, reliably sealing the installation holes at the end parts of the box beams by adopting cover plates to realize equal strength; according to the requirement of seismic fortification or not, the mounting hole of the cantilever box girder adopts a cover plate structure or can be closed reliably;

eleventh, when the stress or structural requirement can be met by adopting a single-side connecting plate, a connecting plate mode is preferably arranged on the inner side of the web or the flange.

When the connecting box girder is adopted for installation, the method is implemented according to the requirements of the twelfth step to the sixteenth step:

step twelve, hoisting the box beam to the position of the cantilever box beam, so that a certain gap is kept between the box beam and the cantilever box beam;

thirdly, removing all temporary fixing bolts of the connecting box girder, respectively sliding the lining connecting box girder and the outer sleeve connecting box girder to connecting positions, and withdrawing hoisting equipment after the bolts of all box girder web plates are installed;

fourteenth, mounting bolts of all box beam flanges;

fifteenth, after all connecting bolts are installed, reliably sealing the mounting holes at the end parts of the box beams by adopting cover plates to realize equal strength; and the mounting holes of the cantilever box girder are in a cover plate structure or can be reliably closed according to the requirement of seismic resistance and fortification.

Sixthly, when the stress or the construction requirement can be met by adopting a single connecting box beam, a lining connecting box beam mode is preferred.

10. The all-bolt connecting method for box-type beam-column with plastic hinge according to claim 9, wherein in the second step, the half-opened rows of the connecting plates are odd-numbered rows.

Background

The development of the fabricated building is encouraged in various places based on the reasons of intensive production, energy consumption reduction, centralized treatment, industrial production, high quality requirements and the like. The steel structure is used as a main form of an assembly type building and is widely applied to multi-story and high-rise buildings. The box-shaped section member can be used for the bearing structure of the multi-story high-rise assembled steel structure building due to the advantages of high torsional rigidity, high stable bearing capacity, high height adaptability and the like.

At present, when box-shaped beams and columns are adopted in multi-story and high-rise buildings, the existing connection methods comprise the following three methods:

(1) weld joint-box beams and box columns are connected by welds.

(2) Bolt welding hybrid connection-the web of the box beam is connected with the box column by bolts, and the flange of the box beam is connected with the box column by welding seams.

(3) Unilateral bolt connection-the box beam and welded end plate are connected with the box column by unilateral bolts.

The existing 'welding seam connection' mode adopts welding seam connection between beam columns completely, and has the defects that:

the on-site welding workload of the box beam column node on the construction site is large, the efficiency is low, and the PM2.5 emission amount is high;

factors influencing welding are more, and the quality is difficult to control;

residual stress and residual deformation generated by welding cannot be eliminated on site, and potential safety hazards of the structure exist.

In the existing bolt welding hybrid connection mode, an important stressed part, namely a flange, of a box beam is still required to be connected with a box column through a welding seam, the field installation efficiency is low, the quality is difficult to control, and the residual stress and the residual deformation generated by welding cannot be eliminated on the field, so that the potential safety hazard of the structure exists.

The existing 'unilateral bolt connection' mode can realize full bolt connection, but the unilateral bolt does not have national standard or standard at present and can be according to, the cost is high.

Disclosure of Invention

In order to solve the technical problems, the invention provides a box-shaped beam-column all-bolt connecting node with a plastic hinge and a method, which reduce the labor intensity and improve the efficiency by on-site full assembly; the components are not required to be welded on site, the quality is easy to guarantee, and the purposes of safe, efficient and environment-friendly connection of the box-shaped beam column nodes are achieved.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides an all-bolt connecting node of a box beam column with a plastic hinge, which comprises a box column, a cantilever box beam, a box beam and a connecting assembly, wherein the box column is provided with a cantilever box beam; one end of the cantilever box girder is fixedly connected with one side of the box column, and the other end of the cantilever box girder is detachably connected with the box girder through the connecting component.

Optionally, a reinforcing plate is arranged between one end of the cantilever box girder and the box column, and one end of the reinforcing plate is inserted into the box column and welded to the inner wall of the box column.

Optionally, one end of the cantilever box girder is provided with a mounting hole and a bolt hole for mounting, and one end of the box girder close to the cantilever box girder is provided with a mounting hole and a bolt hole for mounting.

Optionally, when the connecting assembly is a connecting plate, the connecting plate comprises an inner connecting plate and an outer connecting plate, and the inner connecting plate is a connecting plate with a nut.

Optionally, the inner connecting plate is a connecting plate which is obtained by casting, forging or welding a nut in advance.

Optionally, when the box beam is a welded box beam, slide rails are arranged on the inner sides of the box beam and the cantilever box beam, and the inner side connecting plate slides along the slide rails.

Optionally, when the box girder is rolling box girder, coupling assembling is the connecting box roof beam, the connecting box roof beam includes inside lining connecting box roof beam and overcoat connecting box roof beam, inside lining connecting box roof beam set up in cantilever box roof beam with the inside of box girder, overcoat connecting box roof beam cover is located cantilever box roof beam with the outside of box girder.

Optionally, the cantilever box girder or the box girder is provided with a screw hole for connection.

A method for connecting box-shaped beams and columns with plastic hinges through full bolts comprises the following steps:

a prefabrication stage:

firstly, prefabricating a cantilever box girder, wherein the cantilever box girder and the box girder have the same specification, calculating and determining the number and the positions of bolt holes for connection according to the internal force of a node, determining the number and the positions of bolt holes for installation according to the installation requirement, and processing the bolt holes on the cantilever box girder; welding one end of the cantilever box girder with the wall plate of the box column; welding a reinforcing plate according to the stress and the structure to obtain a box column with the cantilever box girder;

secondly, prefabricating a connecting plate, calculating and determining the actual size and the number of connecting bolt holes according to the internal force of the node, and processing the connecting bolt holes on the connecting plate; or prefabricating the connecting box girder, calculating and determining the actual size and the number of the connecting bolt holes according to the internal force of the node, and processing the connecting bolt holes on the connecting box girder;

thirdly, prefabricating the box beam, calculating and determining the actual size and the number of bolt holes for connection according to the internal force of the node, and processing the bolt holes for connection at the end part of the box beam;

the first step, the second step and the third step are not implemented in sequence;

and (3) an installation stage:

when the connecting plate is adopted for installation, the method is implemented according to the requirements from the fifth step to the eleventh step:

fourthly, hoisting the box beam to the position of the cantilever box beam to keep a certain gap between the box beam and the cantilever box beam;

fifthly, removing temporary fixing bolts between a web plate and a connecting plate of the box girder, keeping bolts at the rotating center of the web plate, enabling bolt holes in the connecting plate on the outer side of the web plate to correspond to bolt holes in the box girder and the cantilever box girder through rotation, and temporarily fixing the connecting plate and the cantilever box girder through the bolts;

sixthly, removing a bolt at the rotating center of the web plate, and placing the connecting plate in place by sliding the inner side of the web plate;

seventhly, mounting all connecting bolts of the web plate;

eighthly, when the web plates on the two sides of the box beam are installed and fixed by the bolts, the hoisting equipment is removed;

ninthly, repeating the fifth step to the eighth step, and installing a connecting plate of the box beam and the cantilever box beam flange;

tenth, after all connecting bolts are installed, reliably sealing the installation holes at the end parts of the box beams by adopting cover plates to realize equal strength; according to the requirement of seismic fortification or not, the mounting hole of the cantilever box girder adopts a cover plate structure or can be closed reliably;

eleventh, when the stress or structural requirement can be met by adopting a single-side connecting plate, a connecting plate mode is preferably arranged on the inner side of the web or the flange.

When the connecting box girder is adopted for installation, the method is implemented according to the requirements of the twelfth step to the sixteenth step:

step twelve, hoisting the box beam to the position of the cantilever box beam, so that a certain gap is kept between the box beam and the cantilever box beam;

thirdly, removing all temporary fixing bolts of the connecting box girder, respectively sliding the lining connecting box girder and the outer sleeve connecting box girder to connecting positions, and withdrawing hoisting equipment after the bolts of all box girder web plates are installed;

fourteenth, mounting bolts of all box beam flanges;

fifteenth, after all connecting bolts are installed, reliably sealing the mounting holes at the end parts of the box beams by adopting cover plates to realize equal strength; and the mounting holes of the cantilever box girder are in a cover plate structure or can be reliably closed according to the requirement of seismic resistance and fortification.

Sixthly, when the stress or the construction requirement can be met by adopting a single connecting box beam, a lining connecting box beam mode is preferred.

Optionally, in the second step, the number of the half-edge rows of the connecting plate should be odd.

Compared with the prior art, the invention has the following technical effects:

(1) the common large hexagon bolt for the steel structure or the torsional shear type high-strength bolt for the steel structure is adopted, the rigid connection node of the full bolt is realized aiming at the connection node of the welded box beam or the rolled box beam and the box column, and the connection mode is suitable for the steel structure, the aluminum alloy structure and the stainless steel structure. When the bolt is suitable for an aluminum alloy structure, the material of the bolt is stainless steel or aluminum alloy and the like.

(2) Aiming at welding box beams, connecting plates of a web plate and a flange are transported and hoisted along with the beams; when in on-site connection, the connecting plate on the inner side of the welded box beam is in place by sliding, and the connecting plate on the outer side is in place by rotating, so that the installation is convenient.

(3) For the rolled box beam, the outer sleeve connecting box beam and the lining connecting box beam are transported and hoisted along with the rolled box beam; the outer sleeve and the lining connecting box beam are both slid to be in place during field connection, and the installation is convenient.

(4) Mounting holes are formed in the cantilever beam sections or the box beams to facilitate the connection plates or the connection box beams to be in place, and after the high-strength bolts are mounted, the mounting holes in the end parts of the box beams are reliably closed by cover plates to achieve equal strength; according to the requirement of earthquake resistance and fortification, the mounting hole of the cantilever beam section is in a cover plate structure or can be closed reliably, whether the plastic hinge of the cantilever box beam occurs is controlled, and the structural durability requirement is met.

(5) In order to improve the convenience of the on-site installation of the connection of the welded box beam and the box column bolt, the connecting plate on the inner side of the welded box beam can be cast, forged or welded with a nut in advance, so that the on-site installation efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a welded box beam in an all-bolt connection joint of a box beam column with a plastic hinge according to the present invention;

FIG. 2 is a schematic structural view of a box beam rolled in an all-bolt connection node of a box beam column with a plastic hinge according to the present invention;

FIG. 3 is a schematic structural view of a box column with a cantilever box beam in an all-bolt connection node of the box beam column with a plastic hinge according to the present invention;

FIG. 4 is a schematic top view of a box column with a cantilever box beam in an all-bolt connection node of the box beam column with plastic hinges according to the present invention;

FIG. 5 is a schematic structural view of an outer connecting plate in the full-bolt connecting node of the box-shaped beam column with the plastic hinge of the invention;

FIG. 6 is a schematic structural view of an inner connecting plate in the full-bolt connecting joint of the box-shaped beam column with the plastic hinge according to the invention;

FIG. 7 is a schematic cross-sectional structural view of an inner connecting plate in the full-bolt connecting joint of the box-shaped beam column with the plastic hinge according to the invention;

FIG. 8 is a schematic cross-sectional view of a box beam with a slide rail in the plastic hinge box beam-column all-bolt connection node of the present invention;

FIG. 9 is a schematic structural view of a connecting box beam in the plastic hinge box beam-column all-bolt connecting joint of the present invention;

FIG. 10 is a schematic structural view of a high-strength bolt in the full-bolt connection node of the box-shaped beam column with the plastic hinge according to the invention;

FIG. 11 is a schematic structural view of the connection of the box-shaped beam-column full-bolt connection node with the plastic hinge by the connection plate;

FIG. 12 is a schematic top view of the connection of the box-shaped beam-column full bolt connection node with the plastic hinge according to the present invention with the connection plate;

FIG. 13 is a schematic structural view of the connection box beam adopted in the plastic hinge box beam-column full bolt connection node of the invention;

FIG. 14 is a schematic top view of the box beam-column full bolt connection node with plastic hinges according to the present invention, wherein the connection box beam is used for connection;

FIG. 15 is a schematic cross-sectional view of the connecting box beam in the plastic hinge box beam-column all-bolt connecting joint of the present invention;

FIG. 16 is a schematic structural view of the plastic hinge box beam column full bolt connection node of the present invention employing reliable sealing and having a cover plate disposed outside the box beam;

FIG. 17 is a schematic structural view of the plastic hinge box beam column full bolt connection node of the present invention adopting reliable sealing and having the cover plate arranged inside the box beam;

FIG. 18 is a schematic structural view of the plastic hinge box beam-column all-bolt connection node of the present invention adopting structural closure and having a cover plate disposed inside the box beam;

fig. 19 is a schematic structural diagram of the plastic hinge box beam-column full-bolt connection node of the invention adopting a structure for closing and arranging a cover plate outside a box beam.

Description of reference numerals: description of reference numerals: 1 welding box beam, 2 rolling box beam, 3 box column, 4 cantilever box beam, 5 mounting holes, 6 reinforcing plate, 7 lining connecting box beam, 8 outer sleeve connecting box beam, 9 high-strength bolt, 10 mounting screw hole, 11 web outer connecting plate, 12 flange outer connecting plate, 13 web inner connecting plate, 14 flange inner connecting plate, 15 slide rail, 16 nut, 17 cover plate, 18 web rotation center bolt, 19 flange rotation center bolt, 20 flange, 21 web.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 19, the present embodiment provides an all-bolt connection node of a box beam column with a plastic hinge, which comprises a box column 3, a cantilever box beam 4, a box beam 1 or 2 and a connection assembly; one end of the cantilever box girder 4 is welded and connected with one side of the box column 3 by adopting a single-edge groove weld joint in a factory, and the other end of the cantilever box girder 4 is connected with the box girder through the connecting component and a high-strength bolt 9.

In this embodiment, a reinforcing plate 6 is disposed between one end of the cantilever box girder 4 and the box column 3, and one end of the reinforcing plate 6 is inserted into the box column 3 and welded to the inner wall of the box column 3 by groove welding in a factory.

One end of the cantilever box girder 4 is provided with a mounting hole 5 and a bolt hole for mounting, and one end of the box girder close to the cantilever box girder 4 is provided with a mounting hole 5 and a bolt hole for mounting.

Coupling assembling is the connecting plate, the connecting plate includes inboard connecting plate and outside connecting plate, inboard connecting plate is for adopting casting in advance, forging and pressing or weld nut 16's connecting plate.

The first embodiment is as follows:

when the box beam is a welded box beam, a slide rail 15 is arranged on the inner side of the welded box beam 1, and the inner connecting plate 13 or 14 slides along the slide rail 15. The slide rail 15 is made of angle steel, and the angle steel is used for limiting the inner connecting plate 13 or 14, so that the inner connecting plate 13 or 14 is kept parallel to the web 21 or the flange 20, and the inner connecting plate 13 or 14 is aligned with the hole on the web 21 or the flange 20 during installation conveniently.

The cantilever box girder 4 is provided with a screw hole 10 for installation. In this embodiment, the mounting screw hole 10 is provided on the side of the connecting screw hole close to the box column 3.

Example two:

in this embodiment, as shown in fig. 13 to 15, the connection assembly is a connection box beam, the connection box beam includes a lining connection box beam 7 and an outer sleeve connection box beam 8, the lining connection box beam 7 is disposed inside the cantilever box beam 4 and the rolling box beam 2, and the outer sleeve connection box beam 8 is sleeved outside the cantilever box beam 4 and the rolling box beam 2. In order to facilitate the installation, the smooth positioning and reasonable stress are ensured, and the outer contour of the lining connecting box girder 7 is 1-2mm smaller than the inner contour circumference of the corresponding rolling cantilever box girder 4 and the corresponding rolling box girder 2; the inner contour of the outer sleeve connecting box beam 8 is 1-2mm larger than the outer contour circumference of the corresponding rolling cantilever box beam 4 and the corresponding rolling box beam 2.

Example three:

the invention also discloses a connecting method of the full-bolt connecting node of the box-shaped beam column with the plastic hinge in the first embodiment, which comprises the following steps:

as in fig. 1 to 7, the prefabrication phase:

firstly, prefabricating a cantilever box girder 4, wherein the cantilever box girder 4 and a welded box girder 1 have the same specification, calculating and determining the number and the positions of bolt holes for connection according to the internal force of a node, determining the number and the positions of bolt holes for installation according to the installation requirement, and processing the bolt holes on the cantilever box girder 4; welding one end of the cantilever box girder 4 and the wall plate of the box column 3; welding a reinforcing plate according to the stress and the structure to obtain a box column 3 with a cantilever box girder 4;

secondly, prefabricating a connecting plate, calculating and determining the actual size and the number of connecting bolt holes according to the internal force of the node, and processing the connecting bolt holes on the connecting plate; the number of the half-edge opening rows of the connecting plate is an odd number of rows;

thirdly, prefabricating the welded box beam 1, calculating and determining the actual size and the number of bolt holes for connection according to the internal force of the node, and processing the bolt holes for connection at the end part of the welded box beam 1;

the first step, the second step and the third step are not implemented in sequence;

as in fig. 11 and 12, the installation phase:

fourthly, hoisting the welded box beam 1 to the position of the cantilever box beam 4, and keeping a certain gap between the welded box beam 1 and the cantilever box beam 4;

fifthly, removing temporary fixing bolts between the web plate and the connecting plate of the welded box beam 1, keeping the bolts at the rotating center of the web plate, enabling bolt holes in the connecting plate on the outer side of the web plate to correspond to bolt holes in the welded box beam 1 and the cantilever box beam 4 respectively through rotation, and temporarily fixing the connecting plate and the cantilever box beam 4 by utilizing the bolts;

sixthly, removing a bolt at the rotating center of the web plate, and enabling a connecting plate at the inner side of the web plate to be in place through sliding;

seventhly, mounting all connecting bolts of the web plate;

eighthly, when the webs on the two sides of the welded box beam 1 are installed and fixed by bolts, the hoisting equipment is removed;

ninthly, repeating the fifth step to the eighth step, and installing a connecting plate for welding the flanges of the box beam 1 and the cantilever box beam 4;

tenth, after all connecting bolts are installed, reliably sealing the installation holes at the end parts of the welded box beams 1 by adopting cover plates to realize equal strength; according to the requirement of seismic fortification or not, the mounting hole 5 of the cantilever beam section is in a cover plate structure or can be reliably closed;

eleventh, when the stress or structural requirement can be met by adopting a single-side connecting plate, a connecting plate mode is preferably arranged on the inner side of the web or the flange.

Example four:

the invention also discloses a connection method of the full bolt connection structure of the beam column with the plastic hinge box in the second embodiment, which comprises the following steps:

as in fig. 1 to 4, and fig. 9, the prefabrication phase:

firstly, prefabricating a cantilever box girder 4, wherein the cantilever box girder 4 and a rolled box girder 2 have the same specification, calculating and determining the number and the positions of bolt holes for connection according to the internal force of a node, determining the number and the positions of bolt holes for installation according to the installation requirement, and processing the bolt holes on the cantilever box girder 4; welding one end of the cantilever box girder 4 and the wall plate of the box column 3; welding a reinforcing plate according to the stress and the structure to obtain a box column 3 with a cantilever box girder 4;

secondly, prefabricating a connecting box beam, calculating and determining the actual size and the number of connecting bolt holes according to the internal force of the node, and processing the connecting bolt holes on the connecting box beam;

thirdly, prefabricating the rolled box beam 2, calculating and determining the actual size and the number of bolt holes for connection according to the internal force of the node, and processing the bolt holes for connection at the end part of the rolled box beam 2;

the first step, the second step and the third step are not implemented in sequence;

and (3) an installation stage:

step ten, hoisting the rolled box beam 2 to the position of the cantilever box beam 4, and keeping a certain gap between the rolled box beam 2 and the cantilever box beam 4;

thirdly, all temporary fixing bolts for connecting the box girder 7 are removed, the lining connecting box girder 7 and the outer sleeve connecting box 8 are respectively slid to connecting positions, all bolts for rolling the web plate of the box girder 2 are installed, and at the moment, hoisting equipment is removed;

fourteenth, mounting all bolts for rolling the flanges of the box beam 2;

fifteenth, after all connecting bolts are installed, reliably sealing the installation holes at the end parts of the rolled box beams 2 by adopting cover plates to realize equal strength; the mounting hole 5 of the cantilever box girder adopts a cover plate structure or can be reliably closed according to the requirement of earthquake resistance and fortification.

Sixthly, when the stress or the construction requirement can be met by adopting a single connecting box beam, the mode of connecting the lining with the box beam 7 is preferred.

The plastic hinge in the invention is a hinge which is relatively rotated at the weak section of the mounting hole 5 when the beam-column joint reaches the ultimate bending moment and the cantilever box beam 4 is completely yielded.

The inner side of the welded box beam 1 adopts a connecting plate with a nut 16, so that the number of parts can be reduced, the loss is reduced, and the installation is convenient.

The invention adopts full bolt connection, the box beam column connection has no on-site welding line, no residual stress and residual deformation generated by welding, and the joint quality is easy to guarantee. The labor intensity of the construction site is low, the efficiency is high, and the requirements of relevant policies of assembly type building and green construction technology advocated by the state are met.

The invention adopts the bolt as a mature product, has complete applicable theoretical basis and has the advantages of low manufacturing cost and conformity with national standard, regulation or regulation.

The installation hole 5 of the cantilever box girder 4 can control whether the plastic hinge of the cantilever box girder 4 occurs or not through structural closure or reliable closure, and is suitable for multi-story and high-rise buildings in areas with or without earthquake-resistant fortification requirements.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.