CN110306658B

CN110306658B - Steel structure assembly system for assembly type building and construction method

Info

Publication number: CN110306658B
Application number: CN201910437877.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Anhui Mcc Huaihai Prefabricated Construction Co Ltd
Current assignee: Anhui Mcc Huaihai Prefabricated Construction Co ltd
Priority date: 2019-05-24
Filing date: 2019-05-24
Publication date: 2020-12-18
Anticipated expiration: 2039-05-24
Also published as: CN110306658A

Abstract

The invention discloses a steel structure assembly system for an assembly type building and a construction method, which are used for solving the problem of poor stress of the existing assembly system. The system comprises upright posts, cross beams and brackets, wherein the same side of two adjacent upright posts is provided with only one pair of brackets which are arranged in the same straight line, and a cross beam is arranged between the two brackets; only one cross beam is connected between two adjacent upright columns, and two ends of each cross beam are movably connected with the brackets on the corresponding upright columns respectively; at least two beams radially arranged outwards are formed on the periphery of each upright, the beams arranged on the same upright do not interfere with each other, and the radiation directions of the beams on two adjacent uprights are opposite; the crossbeam is located the side position that corresponds the stand. The cross beams are overlapped around the stand columns and are arranged in an overlapped radial mode, so that sufficient overlapping space and sufficient telescopic space are provided, and the anti-seismic performance is more excellent.

Description

Steel structure assembly system for assembly type building and construction method

Technical Field

The invention relates to the technical field of assembly type buildings, in particular to a steel structure building technology and a connecting structure.

Background

The fabricated steel structural system is a house unit or member manufactured in accordance with a uniform and standardized building component specification, and can be completed in a factory as much as possible in a factory, and ideally, only an assembly process is required in a construction site. The development and application of the assembly type steel structure system have important significance on the industrialized development of structural engineering, and the development of the industrialized assembly type steel structure system is an urgent requirement for green buildings and building industrialization.

As an important component of an assembly type building system, a steel structure is widely applied to assembly type buildings. The method is divided according to the assembly rate of the steel beam and the steel column, and comprises a welding node and a mechanical assembly type node, and the advantages and the disadvantages of the welding node and the mechanical assembly type node are respectively analyzed.

Taking CN 109024900A filed by Qinghua university as an example, in the assembly type technology, the detachable assembly type steel structure combination beam column joint is particularly disclosed, and comprises a closed section steel column, an H-shaped steel beam, an end plate, a precast concrete plate, an embedded bolt rod, a first nut, a rectangular sleeve or a channel steel, wherein the closed section steel column is arranged along the vertical direction; the H-shaped steel beam is arranged along the horizontal direction; the end plate is arranged along the vertical direction and welded at one end of the H-shaped steel beam; a rectangular sleeve or channel steel with a hole is embedded in the precast concrete plate at the position where the closed section steel column is supported, and an embedded bolt rod is arranged at the bottom of the precast concrete plate; the closed section steel column is fixedly connected with the end plate through a bolt; the H-shaped steel beam is fixedly connected with the precast concrete plate through the embedded bolt rod and the first nut. The node structure is a full-bolt connection type, has the advantages of simple installation mode and high assembly speed, avoids field welding operation, and has the defects that welding stress exists between an H-shaped steel beam and an end plate, a weak point is formed under the strong action of an earthquake, and welding is easy to fall off.

To the research of offsetting of above-mentioned girder steel stress, the inventor has carried out earlier stage's research work, for example the patent technology that Shandong university submitted, CN 207160233U, has disclosed in this literature that use adapters such as angle sign indicating number carry out the technical situation of excessively connecting steel column and girder steel connected node, and in this technique, through disclosing a after-earthquake repairable formula steel beam column unilateral connected node and steel construction building, the junction of girder steel and steel column is provided with web connecting piece and edge of a wing connecting piece, the web connecting piece simultaneously with the web of girder steel with the edge of a wing of steel column is connected, edge of a wing connecting piece simultaneously with the bottom flange of girder steel with the edge of a wing of steel column is connected, the middle part of edge of a wing connecting piece is the weak spot. The essence of the patent technology is that a rotary and plastic hinge connection is formed at a steel structure node position, and the position is subjected to plastic deformation to enable the shock resistance and the controllability.

The steel structure nodes are arranged in a straight line no matter using the adapter or the end plates, the so-called straight line arrangement means that symmetrical structures are formed on two sides of the steel column, namely steel beams on two sides of the steel column are symmetrically arranged, so that two ends of the steel beams do not have enough telescopic spaces, internal stress is generated during service, and under the action of strong earthquake, the connection stress generated due to the telescopic characteristic of the steel beams can be sharply amplified to cause weak links of the connection nodes.

In order to solve the problem that the internal stress generated by the expansion and contraction of the steel beam generates adverse factors under the condition of strong earthquake, the Beijing university of industry in CN 106948484B provides a solution that a weak area with expansion and contraction is arranged on the steel beam, and an auxiliary supporting device is arranged in the weak area for strengthening the earthquake-proof performance of the weak area.

None of the above patent documents fundamentally solves the fundamental problem of the steel structure node.

Fundamentally solves above-mentioned problem, from the root, among the prior art, the connecting portion of girder steel and steel column all is the symmetrical arrangement, and the advantage of symmetrical design is the overall arrangement of being convenient for, and the shortcoming is that the stack that produces the flexible volume easily in the girder steel direction causes internal stress. In any case, such internal stress can be only relieved and cannot be fundamentally solved.

The steel beam in the steel structure should be zero in an ideal state relative to the horizontal telescopic stress generated by the steel column, namely, no stress exists, and the solution in the ideal state has no effective solution in the prior art theory.

The present invention is a technical innovation for solving this problem.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a steel structure connecting system and a construction method, which are used for solving the problems that mounting stress exists at a beam-column joint in the existing steel structure system, particularly harmful stress is generated in the processes of stretching and resisting earthquake of a steel beam, and improving the earthquake resistance of a steel structure.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a steel structure assembly system for an assembly type building is applied to a single-layer or multi-layer building and comprises upright posts, cross beams and corbels for transitionally connecting the cross beams and the upright posts,

the connection between two adjacent stand columns simultaneously satisfies the following cooperation relation:

A. only one pair of brackets are arranged on the same side of the two adjacent upright posts in the same straight line, and a cross beam is arranged between the two brackets;

B. only one cross beam is connected between two adjacent upright columns, and two ends of each cross beam are movably connected with the brackets on the corresponding upright columns respectively;

C. at least two beams radially arranged outwards are formed on the periphery of each upright, the beams arranged on the same upright do not interfere with each other, and the radiation directions of the beams on two adjacent uprights are opposite;

D. the crossbeam is located the side position that corresponds the stand.

Furthermore, the number of the cross beams on each upright post is four or two.

Further, the bracket comprises an inclined support and a rectangular sleeve, wherein the inclined support is fixed on the side face of the stand column, and the rectangular sleeve movably connected with the end part of the cross beam is arranged above the inclined support.

Further, the bracket includes supplementary bearing diagonal and U-shaped body, and wherein, supplementary bearing diagonal is fixed in the stand side, there is the U-shaped body supplementary bearing diagonal top, has the sliding tray in the U-shaped body, and the one end slidable of crossbeam sets up in the sliding tray.

Furthermore, the cross beam is I-shaped steel, sealing plates are arranged at the end parts of the two ends of the cross beam, and the sealing plates and the U-shaped body are elastically connected by using springs and pulling bolts.

The construction method of the steel structure assembly system is characterized in that,

firstly, manufacturing an upright post in a factory, and fixing a bracket on the upright post; meanwhile, the beam is manufactured in a factory;

the second step, transport stand and crossbeam to scene and construction, install the stand according to the construction drawing requirement, the installation stand satisfies:

D. the cross beam is positioned at the side position corresponding to the upright post;

thirdly, laying and fixing bottom templates on the cross beams which are arranged in pairs and opposite to each other;

and fourthly, pouring concrete on the bottom formwork, and forming a floor after curing.

Further, the bracket comprises an inclined support and a rectangular sleeve, wherein the inclined support is fixed on the side face of the stand column, the rectangular sleeve movably connected with the end part of the cross beam is arranged above the inclined support, and the end part of the cross beam can be slidably inserted into the rectangular steel sleeve.

Further, the bracket includes supplementary bearing diagonal and U-shaped body, and wherein, supplementary bearing diagonal is fixed in the stand side, there is the U-shaped body supplementary bearing diagonal top, has the sliding tray in the U-shaped body, the tip slidable of crossbeam sets up in the sliding tray.

Further, before the third step, a construction process of elastically connecting the cross beam and the corresponding bracket by using high-strength bolts is also included.

The invention has the beneficial effects that:

the steel structure system constructed by the technology of the invention has no internal stress in tension or compression in the horizontal direction between the beam and the column, and can move slightly in the horizontal direction under the action of external force such as earthquake and the like, thereby avoiding the fatigue failure at the joint of the beam and the column.

According to the invention, the cross beams are lapped around the stand columns and are arranged in a stacked radial manner, so that sufficient lapping space and sufficient telescopic space are provided, and the combination between the bracket and the stand columns is firmer and has more excellent anti-seismic performance.

All welding and reinforcing procedures are completed in a factory, only an assembly construction link is provided on the spot, high-altitude welding operation is avoided, and the assembly rate and the assembly efficiency are higher.

Drawings

Fig. 1 is a perspective view of the present steel structural system.

Fig. 2 is a perspective view of the cross member.

Fig. 3 is a perspective view of the B pillar.

Fig. 4 is a perspective view of the a pillar.

Fig. 5 is a schematic view of the combination of the A bracket and the upright post.

Fig. 6 is a perspective view (partial) of the bottom template.

Fig. 7 is a partial unit of a steel structural system.

Fig. 8 is a diagram of the construction process of the steel structure system.

FIG. 9 is a partial schematic view of an adjacent cell.

Fig. 10 is a schematic view of a single-layer steel structure system.

Fig. 11 is a schematic view of a multi-layered steel structural system.

Fig. 12 is a multi-layered steel structural system.

FIG. 13 is a schematic view of the second embodiment.

Fig. 14 is a schematic view of the B pillar in the third embodiment.

FIG. 15 is a schematic view of the column A according to the third embodiment.

In the figure: the vertical column of the 10A is provided with a vertical column,

20B of the vertical columns are arranged in the vertical columns,

30 cross beams, 31 sealing plates, 32 high-strength pull bolts, 33 springs, 34 threaded holes,

40A corbels, 41 inclined supports, 42 rectangular sleeves,

50B bracket, 51U-shaped body, 52 baffle, 53 sliding groove,

60 bottom template.

Detailed Description

Example one

The embodiment is implemented for conventional steel structure buildings such as buildings/large public buildings.

A steel construction connection system for assembly type building, in steel construction building, the system of steel construction includes stand, crossbeam and floor structure, and wherein the style of stand includes usually that the section is the steel pipe of rectangle, or the section is the I-steel of I-shaped, or other special construction. In the present embodiment, a steel pipe having a rectangular cross section is exemplified.

Referring to fig. 1 to 5, in the present embodiment, in the process of building a steel structure, the structure of the columns is the same or similar, and the columns are respectively marked according to the building angle, mode and layout of the support members on the columns, but it should be noted that, no matter whether the a columns or the B columns have essential differences in specification and size, they are merely divided for convenience of description. However, it should be emphasized that the fixing and arrangement of the cross beam on the a pillar and the B pillar are different even though the a pillar and the B pillar are not different, which will be described and introduced in the following text.

Usually. In a steel structure building, taking a house as an example, generally, the assembly of the upright posts is reasonably arranged by taking the height of every two to three layers as a unit, so that the lifting and the transportation of the upright posts are facilitated, and the assembly and the earthquake-resistant design of the upright posts are facilitated. In most steel structure buildings, the columns are generally vertically arranged from bottom to top, and the height of each column is two or three times of the layer height.

In fig. 1, the a pillars 10 and the B pillars 20 are arranged in a staggered manner, or each of the a pillars and the B pillars is adjacent to each other, and there is necessarily one B pillar 20 between every two a pillars 10, or there is necessarily one a pillar between every two B pillars, and this arrangement can be expanded with reference to fig. 1, and the grid extension is performed according to different building specifications.

In the embodiment, the upright columns are formed by welding thick steel plates, which is consistent with the processing of steel upright columns in the building industry. The vertical column is provided with a hollow space inside, usually, a hole is drilled on the vertical column at the position where the cross beam needs to be installed, and a bolt installation hole is formed. The T-shaped reinforcing bolt is a common fastener, has two stations or is called as two states, an inserting state and a locking state, the inserting state enables the bolt to be smoothly inserted into the long strip hole, and the locking state can be smoothly locked.

The layout of the column A and the column B is described in detail below with reference to the drawings in the specification.

In fig. 1 and 4, four cross members 30 are fixed to each a-pillar 10, respectively, and the four cross members 30 are arranged in sequence in a counterclockwise (top view) manner, that is, the ends of the four cross members are connected to the a-pillar in a counterclockwise specific direction. And, in the position of the connection point, the end of the beam does not exceed the A-pillar, that is, the four beams do not cross each other.

In fig. 1 and 3, four cross members are fixed to each B-pillar 20, and the four cross members are arranged in sequence in a clockwise (top view) manner, that is, the ends of the four cross members are connected to the B-pillar in a clockwise specific direction.

As can be seen from fig. 1, the columns of the two specifications are arranged in a staggered manner, that is, from the perspective of the cross beam, two ends of each cross beam inevitably fall on the a column and the B column, so that the cross beam completes the connection to the a/B column. And the connection does not have necessary and direct welding stress or connection stress between the cross beam and the A/B upright column, and the problem of stress generated in the process of direct connection between the cross beam and the A/B upright column can be solved.

In this embodiment, the cross section of the upright is preferably a square steel tube upright, and certainly, after secondary or local optimization, an upright with an i-shaped steel cross section can be used, and the local optimization or processing needs to be performed on the upright.

In this embodiment, the cross beam is suitable for a cross beam with a common i-shaped section. Of course, rectangular steel pipes can be used as the cross beams when the construction is allowed.

The utility model discloses a horizontal beam, including stand, crossbeam, A stand, B stand, A stand, B stand. And the cross beams on two sides of the same upright post are arranged in opposite directions and are not collinear.

In this embodiment, the corbels may be respectively denoted as a corbel and B corbel according to different styles, and the corbels of the two styles have the same point and different points, which will be described in detail with reference to fig. 3/4/5 of the specification.

In fig. 5, a connection state diagram of a single a bracket and a column is shown.

The A bracket 40 comprises an inclined support 41 and a rectangular sleeve 42, wherein the inclined support 41 is a triangular iron structure consisting of a vertical plate and a flat plate, a plurality of reinforcing rib plates are welded in the triangular iron structure and are mainly used for bearing the downward pressure from the end part of the cross beam, the main stress mode is vertical shear stress, in the embodiment, the inclined support and the stand column are connected through bolts, and even if high-strength bolts are used for connection, the welded connection can be adopted. Usually, the connection between the diagonal bracing and the upright is done at the ground or in a steel structure workshop, which can avoid high-altitude operation. The upper part of the diagonal brace is a rectangular sleeve, the rectangular sleeve 42 is a steel sleeve with a rectangular section, the rectangular sleeve is generally welded on the diagonal brace, the rectangular sleeve and the diagonal brace are connected into a whole, and meanwhile, the rectangular sleeve and the upright post are welded or bolted to form a whole. The rectangular sleeve is fixed on the upright post and mainly bears the lateral drawing force.

In this embodiment, the connection process between the bracket a and the upright is preferably completed in a factory workshop, that is, the structure can realize factory production, and improve the assembly efficiency and the assembly rate.

In fig. 5, the rectangular sleeve 42 is connected with the column by using a high-strength bolt, specifically, a fabrication hole and a bolt hole are formed in the rectangular sleeve, the rectangular sleeve can be conveniently fixed by using the bolt through the fabrication hole, and meanwhile, the rectangular sleeve and the column are connected in an auxiliary manner by using a welding manner.

Similarly, the structure of the B bracket 50 is referenced to the structure of the A bracket and to the manner in which the A bracket is attached. The difference from the A bracket is emphasized here.

In the B bracket, the structure, the stress mode and the like of the inclined support are completely the same as those in the A bracket, the upper part of the B bracket 50 is a U-shaped body 51, the U-shaped body is connected with the upright post by using a high-strength bolt or is welded and fixed, the baffle plate 52 is welded in the U-shaped body, the welding position of the baffle plate is welded, an open sliding groove 53 is formed in the U-shaped body after the baffle plate is welded, the orientation of the sliding groove is different on the A upright post and the B upright post, specifically, in the A upright post, the orientation of the sliding groove 53 is anticlockwise, namely, one end of the cross beam is lapped in the sliding groove in the anticlockwise direction. In the B-pillar, the sliding groove is oriented clockwise, that is, one end of the cross beam overlaps the sliding groove in a clockwise direction.

Crossbeam 30 adopts the section to be the steel construction of I-shaped, and the pterygoid lamina that sets up including vertical steel web and level is constituteed, has good mechanical properties, welds shrouding 31 at the tip at the both ends of crossbeam to be provided with the bolt hole on the shrouding of one end wherein, wear to establish a high strength in the bolt hole and draw bolt 32, and draw and set up spring 33 between bolt and the shrouding, the spring is preferred to be set up in the near-end of crossbeam, also is exactly the I-shaped inslot of crossbeam, refers to fig. 2. Threaded holes 34 are machined in the cross beam as needed for installation of the pouring bottom form 60.

For the sake of detailed description of the present steel structure system, in fig. 1, the three-dimensional space of the steel structure is defined by reference to the coordinate system in fig. 1.

In this steel structural system, A stand and B stand are arranged according to the mode at interval each other, that is to say adjacent must be B stand 20 with A stand 10, equally, adjacent must be A stand with B stand, three A stands and three B stands have been given altogether in FIG. 1, form the staggered mode of misplacing each other and arrange, set up A bracket and B bracket at the same horizontal position of every stand, wherein, in the in-process of hoist and mount A stand or B stand, require to satisfy the following relation between two adjacent A stands and the B stand:

1. two adjacent A stands and B stand have with one side and only have one A bracket and B bracket with the straight line setting each other, and satisfy the hoist and mount, the installation requirement of a crossbeam of installation between two brackets.

2. Only one cross beam connection exists between two adjacent upright columns (such as an upright column A and an upright column B);

3. four beams radially arranged outwards are formed around each upright post, and the four beams do not interfere with each other;

4. the cross beam is positioned at the side position corresponding to the upright post;

in the process of hoisting the beam, one end of the beam is inserted into the rectangular sleeve in the bracket A, the other end of the beam is placed in the sliding groove of the bracket B, and finally the end of the beam is connected with the baffle 52 of the bracket B by using the nut. Meanwhile, a high-strength bolt is screwed into the near-end technical hole of the bracket A to limit the cross beam. After the installation, the cross beam forms an unstressed and slidable installation between the two upright columns, and only acting force in the vertical direction exists between the cross beam and the upright columns at the two ends, so that welding stress or bolting stress does not exist.

Referring to fig. 7 to 10, four beams arranged in a counterclockwise direction are formed on the corbel of the a-pillar while four beams arranged in a clockwise direction are formed on each corbel of the B-pillar through a continuous hoisting work. The two ends of each beam are necessarily connected with the A upright post and the B upright post, and only one beam is necessarily connected between every two adjacent A upright posts.

According to the above scheme, a single-layer steel structure can be constructed, and a multi-layer steel structure can also be constructed, as shown in fig. 11.

The construction method aiming at the steel structure system comprises the following steps:

firstly, manufacturing an upright post A and an upright post B in a factory, and designing brackets on the two upright posts according to drawings on a figure 3 and a figure 4; the beam is manufactured in a factory; the fabricated beam is shown with reference to fig. 2.

The second step, the field assembly, install A stand and B stand according to the drawing requirement, it is concrete, should satisfy, take fig. 1 and fig. 10 as an example, in same row, the mounting means of four brackets on each A stand is the same, in same row, the mounting means of four brackets on each B stand is the same, in adjacent row simultaneously, two adjacent A stands become the pattern of 180 degrees contained angles and exist, refer to fig. 1, this kind of layout mode can satisfy:

1. two adjacent A stands and B stand have and only a pair of A bracket and B bracket with the collinear setting each other, and satisfy the hoist and mount, the installation requirement of a crossbeam of installation between two brackets.

3. four beams radially arranged outwards are formed around each upright post;

the requirements of (1).

And thirdly, connecting the cross beams with the corresponding brackets by using high-strength bolts, specifically, elastically connecting one end of each cross beam by using a high-strength pulling bolt and a spring, inserting the other end of each cross beam into the rectangular steel sleeve, and performing safety limiting by using a limiting bolt.

Fourthly, paving bottom formworks on the cross beams which are arranged oppositely in pairs, referring to fig. 5, and fastening by using fastening screws to gradually finish the paving of all the bottom formworks; refer to fig. 10. In a steel structure building, a bottom template is usually made of a thin steel plate with folds and is matched with a template supporting system to realize the pouring of floor concrete.

And fifthly, pouring concrete on the bottom formwork, and forming a floor after curing, referring to fig. 12.

Example two

In the first embodiment, four brackets are installed around each column, so that a cross beam assembly system in a shape like a Chinese character 'tian' is formed in the steel structure system, and in the actual steel structure, simplification can be performed as required, for example, two brackets are formed in each column, and a cross beam assembly system in a shape like a Chinese character 'ri' is formed in the steel structure, refer to fig. 13.

Through this kind of mode, form two brackets respectively on every stand, can reduce half bracket quantity and half crossbeam quantity, this kind of mode satisfies the following requirement equally:

1. in same line (X direction), two adjacent A stands and B stand have and only a pair of A bracket and B bracket with the straight line setting each other, and satisfy the hoist and mount, the installation requirement of installing a crossbeam between two brackets.

2. In the same row, only one beam is connected between two adjacent A upright columns and B upright columns;

3. two beams radially arranged in the opposite direction are formed on two sides of each upright post;

the steel structure system is suitable for single-storey buildings or multi-storey buildings.

EXAMPLE III

The embodiment is different from the first embodiment in that a B bracket is provided, specifically, no baffle is provided in the B bracket, that is, the cross beam and the B bracket are connected in an overlapping manner, and after the assembly is completed, the cross beam and the B bracket are welded and fixed, so that one end of the cross beam is welded and fixed to the B bracket, and the other end of the cross beam is slidably connected to the rectangular sleeve in the a bracket, which is more convenient to implement than the first embodiment, and this implementation structure can be referred to fig. 14 and 15.

Example four

On the basis of the third embodiment, the arrangement mode of the second embodiment is combined, namely, two brackets are arranged on each upright column, and the following requirements are also met:

EXAMPLE five

The difference from the first embodiment is that four brackets are arranged on each upright, and the four brackets are four A brackets with the same structure, so that the assembly and installation can be realized.

The above-described examples are merely illustrative of preferred embodiments of the present invention and do not limit the scope of the invention.

Claims

1. A steel structure assembly system for assembly type building is applied to single-layer or multi-layer building,

comprises a vertical column, a cross beam, an A bracket and a B bracket which are in transition connection with the cross beam and the vertical column,

it is characterized in that the bracket A and the bracket B are respectively fixed on two adjacent upright posts, wherein,

the bracket A comprises an inclined support and a rectangular sleeve, the inclined support is fixedly connected with the upright post, the rectangular sleeve is fixed above the inclined support, and the rectangular sleeve is fixedly connected with the upright post;

the bracket B comprises an auxiliary inclined support and a U-shaped body, wherein the auxiliary inclined support is fixedly connected with the upright post, the U-shaped body is fixed above the auxiliary inclined support, the U-shaped body is fixedly connected with the upright post, and a baffle is welded at the end part, perpendicular to the sliding direction of the sliding groove, in the U-shaped body;

the cross beam is composed of a steel web plate and a wing plate, seal plates are arranged at the end parts of two ends of the cross beam, and the two ends of the cross beam are respectively connected with the bracket A and the bracket B, wherein one end of the cross beam is movably arranged in a sliding groove of the bracket B, a plurality of groups of pull bolts are arranged between the end seal plates and the baffle plates, and springs are arranged between the pull bolts and the seal plates to form elastic connection; the other end of the cross beam is inserted into the rectangular sleeve of the bracket A, and a limiting bolt is arranged on the rectangular sleeve to limit the cross beam;

a bottom template is fixedly poured on an upper wing plate of the cross beam; through the construction between crossbeam and the stand for the connection between two adjacent stands satisfies following cooperation simultaneously:

A. the same side of two adjacent upright posts is provided with only the bracket A and the bracket B which are arranged in the same line with each other,

a beam is arranged between the bracket A and the bracket B;

B. only one cross beam is connected between every two adjacent upright columns, and two ends of each cross beam are movably connected with the bracket A and the bracket B on the corresponding upright column respectively;

D. the crossbeam is located the side position that corresponds the stand.

2. The steel structure assembling system for prefabricated buildings according to claim 1, wherein the number of the cross beams on each upright is four or two.

3. The construction method of the steel structural assembling system for prefabricated buildings according to any one of claims 1 to 2,

firstly, manufacturing stand columns in a factory, and fixing a bracket A and a bracket B on two adjacent stand columns; the bracket A comprises an inclined support and a rectangular sleeve, the inclined support is fixedly connected with the upright post, the rectangular sleeve is fixed above the inclined support, and the rectangular sleeve is fixedly connected with the upright post;

meanwhile, the beam is manufactured in a factory, wherein the beam main body consists of a steel web plate and wing plates, and sealing plates are arranged at the end parts of two ends of the beam;

through the construction between crossbeam and the stand for the connection between two adjacent stands satisfies following cooperation simultaneously:

A. only the bracket A and the bracket B are arranged in the same straight line at the same side of the two adjacent upright posts, and a beam is arranged between the bracket A and the bracket B;

thirdly, inserting one end of each cross beam into a sliding groove in the bracket B and elastically connecting the cross beams by using a pulling bolt and a spring, inserting the other end of each cross beam into a rectangular steel sleeve in the bracket A and safely limiting the cross beams by using a limiting bolt;

fourthly, paving and fixing bottom formworks on the cross beams which are arranged in pairs and oppositely;

and fifthly, pouring concrete on the bottom template, and forming a floor after curing.

4. The construction method according to claim 3, further comprising a construction process of elastically connecting the cross beam and the corresponding bracket using high-strength bolts before the fourth step.