CN213926763U - Corner fitting connecting structure of prefabricated house connecting piece system - Google Patents

Abstract

The utility model discloses an angle piece connection structure of prefabricated house connecting piece system, including the angle piece, the angle piece is the L type, and the crossbeam is connected to angle piece both ends opening part, and the angle piece adopts welded connection with the crossbeam, and the connecting piece is connected to the ascending both sides of the vertical side of angle piece, and the connecting piece adopts bolted connection with the angle piece. The utility model discloses a welding formation plane frame of crossbeam and corner fittings, the connecting piece is connected with the stand and is formed integratively, and the bolted connection of rethread connecting piece and corner fittings builds the frame, and the installation effectiveness is high, quick detachable.

Description

Corner fitting connecting structure of prefabricated house connecting piece system

Technical Field

The utility model belongs to the technical field of integrated house technique and specifically relates to a corner fittings connection structure of prefabricated house connecting piece system is related to.

Background

The technology of the assembled integrated house in the 21 st century is rapidly popularized, and the construction development of the building house with low cost, high level and short construction period is realized mainly through specialized design, standardized production and modularized construction assembly. The integrated house has the advantages of convenience in installation, convenience in transportation, energy conservation, environmental friendliness and reusability.

The general integrated house crossbeam, stand build the frame through on-the-spot welding angle piece or connecting piece, and on-the-spot welding not only installation effectiveness is not high and the installation accuracy is lower, has great clearance between crossbeam and the crossbeam, between crossbeam and the stand, still difficult dismantlement after the assembly is accomplished, consequently need improve this urgently.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art not enough, provide an angle piece connection structure of prefabricated house connecting piece system, through the welding formation plane frame of crossbeam with the angle piece, the connecting piece is connected with the stand and is formed integratively, and the frame is set up with the bolted connection of angle piece to the rethread connecting piece, and the installation effectiveness is high, quick detachable.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the corner fitting is L-shaped, the two ends of the corner fitting are connected with the cross beam through openings, the corner fitting is connected with the cross beam in a welding mode, the two sides of the corner fitting in the vertical direction are connected with the connecting piece, and the connecting piece is connected with the corner fitting through bolts.

The crossbeam is the square roof beam of cavity, corner fittings side opening part extends towards the crossbeam direction and is equipped with the spacing ring, inside the spacing ring inserted the crossbeam, the crossbeam butt corner fittings side.

The side faces of the corner fittings are flush with the side faces of the cross beams.

The upper surface and the lower surface of the corner piece are provided with positioning holes and a plurality of threaded holes, and the threaded holes are distributed around the positioning holes.

The connecting piece comprises single-node connecting pieces, one single-node connecting piece is connected with one corner piece and comprises a first base plate, the first base plate is provided with a first through hole which corresponds to the threaded hole and penetrates through the first base plate, the bolt penetrates through the first through hole and is screwed into the threaded hole, the first base plate extends towards the corner piece and is provided with a first limiting convex point corresponding to the positioning hole of the single corner piece, and the first limiting convex point is inserted into the positioning hole for positioning.

The connecting piece comprises a double-node connecting piece, one double-node connecting piece is connected with two corner fittings, the double-node connecting piece comprises a second base plate, the second base plate is provided with a second through hole corresponding to the threaded holes of the two corner fittings, the second through hole penetrates through the second base plate, the bolt penetrates through the second through hole and is screwed into the threaded hole, a second limiting convex point corresponding to the positioning holes of the two corner fittings is arranged on the second base plate in an outward extending mode, and the second limiting convex point is respectively inserted into the positioning holes of the two corner fittings for positioning.

The connecting piece comprises four-node connecting pieces, one of the four-node connecting pieces is connected with four corner pieces, each four-node connecting piece comprises a third base plate, each third base plate is provided with a third through hole corresponding to the threaded holes of the four corner pieces, each third through hole penetrates through the corresponding third base plate, each bolt penetrates through the corresponding third through hole and is screwed into the corresponding threaded hole, each third base plate extends outwards to be provided with a third limiting convex point corresponding to the positioning holes of the four corner pieces, and the third limiting convex points are inserted into the positioning holes of the four corner pieces respectively for positioning.

The connecting piece comprises three-node connecting pieces, one three-node connecting piece is connected with three corner pieces and comprises a fourth bottom plate, the fourth bottom plate is provided with a fifth through hole corresponding to the threaded holes of the three corner pieces, the fifth through hole penetrates through the fourth bottom plate, the bolt penetrates through the fifth through hole and is screwed into the threaded hole, a fourth limiting convex point corresponding to the positioning holes of the three corner pieces is arranged on the fourth bottom plate in an outward extending mode, and the fourth limiting convex point is respectively inserted into the positioning holes of the two corner pieces for positioning.

The inside extension of corner fittings is equipped with many strengthening ribs, the strengthening rib is the L type and the direction is unanimous with the corner fittings.

Still include the stand, the stand passes through the connecting piece to be connected on the corner fittings, stand and connecting piece pass through welded connection.

The utility model has the advantages that:

1. the cross beams and the corner pieces are connected with each other to form a plurality of unit surfaces, and the unit surfaces are connected through a plurality of connecting pieces to form a layer of plane, so that the connecting mode is simple and reasonable, the assembly is convenient and quick, and the modularization and the standardization of the house frame are favorably realized;

2. when the connecting piece and the corner piece are assembled and fixed, the limiting convex points on the connecting piece are inserted into the positioning holes of the corner piece, so that the through holes and the threaded holes are conveniently positioned, and the assembly efficiency is improved;

3. when the cross beam and the corner fitting are welded, the first limiting rib is inserted into the cross beam for limiting, and then welding operation is performed at the joint of the cross beam and the corner fitting, so that the structure not only can facilitate welding operation and improve welding efficiency, but also can ensure welding precision;

4. when the corner fittings atress, the strengthening rib plays the supporting role to the corner fittings, can improve the anti ability of buckling of corner fittings through the strengthening rib, prevents that the corner fittings warp.

Drawings

FIG. 1 is a first frame diagram of the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is an enlarged view of FIG. 1 at B;

FIG. 4 is an enlarged view of FIG. 1 at C;

fig. 5 is a top view of a first frame of the present invention;

FIG. 6 is an exploded view at a single node connection;

FIG. 7 is an exploded view at a dual node connection;

FIG. 8 is an exploded view at a four node connection;

FIG. 9 is a schematic view of the corner fitting;

FIG. 10 is a schematic view of a single node connection;

FIG. 11 is a schematic structural view of a dual node connector;

FIG. 12 is a schematic structural view of a four-node connection;

FIG. 13 is a second frame diagram of the present invention;

FIG. 14 is an enlarged view of FIG. 12 at D;

FIG. 15 is an exploded view at the three node connection;

fig. 16 is a schematic view of the structure of the three-node connection.

In the figure: crossbeam 1, upright 2, single-node upright 21, double-node upright 22, four-node upright 23, three-node upright 24, corner fitting 3, positioning hole 31, threaded hole 32, limiting ring 33, reinforcing rib 34, connecting piece 4, single-node connecting piece 41, first bottom plate 411, first top plate 412, first supporting rib 413, first limiting rib 414, first through hole 415, first limiting salient point 416, double-node connecting piece 42, second bottom plate 421, second top plate 422, second supporting rib 423, second limiting rib 424, second through hole 425, second limiting salient point 426, four-node connecting piece 43, third bottom plate 431, third top plate 432, third supporting rib 433, third limiting rib 434, third through hole 435, third limiting salient point 436, fourth through hole 437, three-node connecting piece 44, fourth bottom plate 411, fourth top plate 442, fourth supporting rib 443, fourth limiting rib 444, fifth through hole 445, third limiting salient point 446, Bolt 5, unit surface 6, frame 7.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments:

in the description of the present specification, the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplified description, and do not indicate or imply that the referred device or unit must have a specific direction, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 16, the corner fitting connecting structure of the prefabricated integrated house connecting piece system comprises a corner fitting 3, wherein the corner fitting 3 is L-shaped, two openings at two ends of the corner fitting 3 are connected with a cross beam 1, the corner fitting 3 is connected with the cross beam 1 in a welding manner, the cross beam 1 is a hollow square beam, a limiting ring 33 is arranged at the opening at the side surface of the corner fitting 3 and extends towards the cross beam 1, the limiting ring 33 is inserted into the cross beam 1, the cross beam 1 is abutted against the side surface of the corner fitting 3, wherein the cross beam 1 is a standard component, when the cross beam 1 is welded with the corner fitting 3, the limiting ring 33 is firstly inserted into the cross beam 1 for limiting, then the welding operation is carried out at the joint of the cross beam 1 and the corner fitting 3, the structure not only can facilitate the welding operation and improve the welding efficiency, but also can ensure the welding precision, and the welding between the cross beam 1 and the corner fitting 3 can be directly processed in a factory, and then the upright posts 2 are connected through the connecting pieces 4 to build the frame 7 when the frame is transported to the site, so that the working efficiency is greatly improved.

Connecting pieces 4 are connected to two sides of the corner piece 3 in the vertical direction, the connecting pieces 4 are connected with the corner piece 3 through bolts 5, positioning holes 31 and a plurality of threaded holes 32 are formed in the upper surface and the lower surface of the corner piece 3, and the threaded holes 32 are distributed around the positioning holes 31.

Specifically, the connecting member 4 includes a single-node connecting member 41, one single-node connecting member 41 is connected with one corner fitting 3, the single-node connecting member 41 includes a first base plate 411, the first base plate 411 is provided with a first through hole 415 corresponding to the threaded hole 32 and penetrating through the first base plate 411, the bolt 5 passes through the first through hole 415 and is screwed into the threaded hole 32, the first base plate 411 extends towards the corner fitting 3 and is provided with a first limit salient point 416 corresponding to the positioning hole 31 of the single corner fitting 3, the first limit salient point 416 is inserted into the positioning hole 31 for positioning, compared with the prior art, the first connecting member 21 is fixed on the corner fitting 3 through a plurality of bolts 5, the force applied to the single-node connecting member 41 can be dispersed on each bolt 5, so that the force is not concentrated on only one point, the bearing capacity of the frame is greatly increased, and when the frame 7 is built, welding is cancelled and the bolt 5 is adopted for connection, so that the efficiency of building the frame 7 is greatly improved, and the later-stage disassembly is facilitated.

Importantly, before the single-node connecting piece 41 is connected with the corner piece 3, the first limiting salient point 416 is firstly inserted into the positioning hole 31 for limiting, so that the first through hole 415 can be opposite to the threaded hole 32, the bolt 5 can be conveniently screwed in, and the assembling time is greatly saved.

Further, the first limit salient point 416 is in a conical structure, and the diameter of the cross section of the first limit salient point 416 is gradually reduced from the first bottom plate 411 to the corner fitting 3, so that the first limit salient point 416 has a guiding function, and the first limit salient point 416 can be conveniently inserted into the positioning hole 32.

The connecting member 4 comprises a double-node connecting member 42, one double-node connecting member 42 connects two corner fittings 3, the double-node connecting member 42 comprises a second bottom plate 421, the second bottom plate 421 is provided with a second through hole 425 corresponding to the threaded holes 32 of the two corner fittings 3, the second through hole 425 penetrates through the second bottom plate 421, the bolts 5 penetrate through the second through hole 425 and are screwed into the threaded holes 32, the second bottom plate 421 extends outwards and is provided with second limit salient points 426 corresponding to the locating holes 31 of the two corner fittings 3, the second limit salient points 426 are respectively inserted into the locating holes 31 of the two corner fittings 3 for positioning, the double-node connecting member 42 is connected to the two adjacent corner fittings 3 through a plurality of bolts 5, so as to fixedly connect the two adjacent unit faces 6 together, wherein the number of the second through holes 425 is twice the number of the threaded holes 32 of one of the upper and lower faces of the single corner fitting 3, i.e. the number of second through holes 425 in the double node connector 42 is the sum of the number of threaded holes 32 in the same face of the two corner pieces 3.

Further, the second limit salient points 426 are conical structures, the diameter of the cross section of the second limit salient points 426 decreases gradually from the second base plate 421 to the corner fittings 3, the number of the second limit salient points 426 is equal to the sum of the number of the positioning holes 31 on the same surface of the two corner fittings 3, when the two corner fittings 3 are connected by the double-node connecting piece 42, the two corner fittings 3 are firstly close to each other, the second limit salient points 426 are respectively inserted into the positioning holes 31 of the two corner fittings 3, the two corner fittings 3 are initially pulled and are not easy to be separated, after the second limit salient points 426 are inserted into the positioning holes 31, the second through holes 425 on the double-node connecting piece 42 correspond to the threaded holes 32 on the two corner fittings 3 one by one, and then are connected and fixed by the bolts 5.

The connecting piece 4 comprises four-node connecting pieces 43, one four-node connecting piece 43 is connected with four corner pieces 3, the four-node connecting piece 43 comprises a third bottom plate 431, the third bottom plate 431 is provided with a third through hole 435 corresponding to the threaded holes 32 of the four corner pieces 3, the third through hole 435 penetrates through the third bottom plate 431, the bolt 5 penetrates through the third through hole 435 and is screwed into the threaded hole 32, the third bottom plate 431 is outwards extended and provided with third limiting salient points 436 corresponding to the positioning holes 31 of the four corner pieces 3, the third limiting salient points 436 are respectively inserted into the positioning holes 31 of the four corner pieces 3 for positioning, the four-node connecting pieces 43 are connected to the four corner pieces 3 which enclose a Chinese character 'tian' -shaped plane through a plurality of bolts 5, and therefore the four corner pieces 3 are fixedly connected together.

Furthermore, the third limiting salient points 436 are conical structures, the diameter of the cross section of the third limiting salient points 436 gradually decreases from the third bottom plate 431 to the corner fittings 3, the number of the third limiting salient points 436 is four times that of the positioning holes 31 on one of the upper and lower surfaces of a single corner fitting 3, when four corner fittings 3 are connected, the four corner fittings 3 are respectively inserted into the positioning holes 31 of the four corner fittings 3 through the third limiting salient points 436 on the four-node connecting piece 43, the four corner fittings 3 are mutually tightened, and then are connected and fixed through bolts 5.

The connecting piece 4 comprises three-node connecting pieces 44, one three-node connecting piece 44 is connected with three corner pieces 3, the three-node connecting piece 44 comprises a fourth bottom plate 441, the fourth bottom plate 441 is provided with a fifth through hole 445 corresponding to the threaded holes 32 of the three corner pieces 3, the fifth through hole 445 penetrates through the fourth bottom plate 441, the bolt 5 penetrates through the fifth through hole 445 and is screwed into the threaded hole 32, a fourth limiting salient point 446 corresponding to the positioning holes 31 of the three corner pieces 3 extends outwards from the fourth bottom plate 441, and the fourth limiting salient points 446 are respectively inserted into the positioning holes 31 of the two corner pieces 3 for positioning.

Inside the extending of corner fittings 3 is equipped with many strengthening ribs 34, strengthening rib 34 is the L type and the direction is unanimous with corner fittings 3, and when corner fittings 3 atress, strengthening rib 34 plays the supporting role to corner fittings 3, can improve corner fittings 3's anti ability of buckling through strengthening rib 34, prevents that corner fittings 3 warp, and wherein, corner fittings 3's material is Q335 steel, and is higher than crossbeam 1's intensity.

The side face of the corner fitting 3 is flush with the side face of the cross beam 1, so that the surface of a unit face 6 formed by the corner fitting and the cross beam is flat, and the placement of a rear beam plate built by the frame 7 is facilitated.

Wherein, the utility model discloses an integrated house connecting piece system of assembled includes one deck frame 7, every layer at least frame 7 is formed, every by the mutual concatenation of a plurality of cell faces 6 through stand 2 and connecting piece 4 cell face 6 includes interconnect formation square planar crossbeam 1, wherein, individual layer frame 7 highly corresponds stand 2 and two connecting piece 4's height in addition, and in order to guarantee frame 7 firm reliable, Q235B steel is chooseed for use to crossbeam 1 and stand 2's material, and single crossbeam 1's length is no longer than six meters, and single stand 2's height is no longer than three meters, and frame 7 is no longer than the three-layer.

The upright post 2 is connected to the corner fitting 3 through a connecting piece 4, and the upright post 2 and the connecting piece 4 are connected through welding.

The upright post 2 comprises a single-node upright post 21, the corner pieces 3 of two adjacent unit surfaces 6 up and down distributed along the Z-axis direction are connected with single-node connecting pieces 41, the single-node upright post 21 is connected between the two adjacent single-node connecting pieces 41 up and down, the frame 7 at least comprises four edge angles, and the two corresponding single-node connecting pieces 41 up and down positioned at the edge angles are connected through the single-node upright post 21;

single node connecting piece 41 adopts welded connection with single node stand 21, single node connecting piece 41 includes first bottom plate 411 and first roof 412, first bottom plate 411 and first roof 412 are connected through first supporting rib 413, one side that first roof 412 is close to single node stand 21 is equipped with first spacing muscle 414, single node stand 21 is hollow structure, first spacing muscle 414 inserts in the single node stand 21.

Outer profile face and first roof 412 on the vertical side of first bottom plate 411 flush, outer profile face and first roof 412 on the vertical side of single node stand 21 flush, first support muscle 413 is that cross muscle and the ascending outer profile face of vertical side flush with first bottom plate 411, and when single node connecting piece 421 welds on single node stand 21, the outline size is unanimous, connects first bottom plate 411 and first roof 412 through the first support muscle 413 of cross muscle structure, under the prerequisite of guaranteeing single node stand 41 bearing strength, can save material, practice thrift the cost.

The upright column 2 comprises a double-node upright column 22, two adjacent unit surfaces 6 distributed along the X-axis or Y-axis direction are connected through a double-node connecting piece 42, the double-node connecting piece 42 is connected with two adjacent corner pieces 3 on the same layer, the double-node upright column 22 is connected between the two adjacent double-node connecting pieces 42 on the upper layer and the lower layer, and the double-node upright column 22 is connected with the upper layer and the lower layer of unit surfaces 6 which are positioned on the outer side of the frame 7 except the outer edge angle of the frame 7;

the double-node connecting piece 42 is connected with the double-node upright post 22 in a welding mode, the double-node connecting piece 42 comprises a second bottom plate 421 and a second top plate 422, the second bottom plate 421 and the second top plate 422 are connected through a second supporting rib 423, a second limiting rib 424 is arranged on one side, close to the double-node upright post 22, of the second top plate 422, the double-node upright post 22 is of a hollow structure, and the second limiting rib 424 is inserted into the double-node upright post 22;

the outer contour surface of the second bottom plate 421 in the vertical direction is flush with the second top plate 422, the outer contour surface of the two-node pillar 22 in the vertical direction is flush with the second top plate 422, and the outer contour surface of the second support rib 423 in the vertical direction is flush with the second bottom plate 421.

The upright post 2 comprises four-node upright posts 23, the four unit surfaces 6 positioned on the same layer are connected through four-node connecting pieces 43 to form a field-shaped plane, the four-node connecting pieces 43 are positioned at the center of the field-shaped plane, the four-node upright post 23 is connected between two vertically adjacent four-node connecting pieces 43, and the four-node upright posts 23 are connected with the unit surfaces 6 on two vertically adjacent layers in the framework 7;

the four-node connecting piece 43 is connected with the four-node upright 23 in a welding manner, the four-node connecting piece 43 comprises a third bottom plate 431 and a third top plate 432, the third bottom plate 431 and the third top plate 432 are connected through a third supporting rib 433, a third limiting rib 434 is arranged on one side, close to the four-node upright 23, of the third top plate 432, the four-node upright 23 is of a hollow structure, and the third limiting rib 434 is inserted into the four-node upright 23;

still further, the outer contour surface of the third bottom plate 431 in the vertical direction is flush with the third top plate 432, the outer contour surface of the four-node upright post 23 in the vertical direction is flush with the third top plate 432, and the outer contour surface of the third support rib 433 in the vertical direction is flush with the third bottom plate 431, wherein a fourth through hole 437 which is communicated with the upper surface and the lower surface of the four-node connecting member 43 is arranged in the middle of the four-node connecting member 43, and the fourth through hole 437 is designed to save material cost and weight on the premise of ensuring the bearing capacity of the four-node connecting member 43.

The frame 7 is constructed by matching the cross beam 1, the single-node upright post 21, the double-node upright post 22, the four-node upright post 23, the corner fitting 3, the single-node connecting piece 41, the double-node connecting piece 42 and the four-node connecting piece 43, and the plane of each layer of frame 7 is at least composed of four mutually adjacent unit surfaces 6 forming a Chinese character 'tian'.

The upright post 2 further comprises three-node upright posts 24, when any one unit surface 6 of the four unit surfaces 6 which enclose a Chinese character tian shape is eliminated, the other three unit surfaces 6 are connected through three-node connecting pieces 44, the three-node connecting pieces 44 are connected with three adjacent corner pieces 3, and the three-node upright posts 24 are connected between two vertically adjacent three-node connecting pieces 44;

the three-node connecting piece 44 is in an L shape, the three-node connecting piece 44 is connected with the three-node upright post 24 by welding, the three-node connecting piece 44 comprises a fourth bottom plate 441 and a fourth top plate 442, the fourth bottom plate 441 and the fourth top plate 442 are connected by a fourth supporting rib 443, a fourth limiting rib 444 is arranged on one side, close to the three-node upright post 24, of the fourth top plate 442, the three-node upright post 24 is of a hollow structure, and the fourth limiting rib 444 is inserted into the three-node upright post 24;

the frame 7 formed by the three-node connecting piece 44 is a special-shaped frame, and the three-node connecting piece 44 connects three corner pieces 3 which are close to each other on three unit surfaces 6 together through bolts 5 to form the frame 7 with at least one notch.

The outer contour surface of the fourth bottom plate 441 in the vertical direction is flush with the fourth top plate 442, the outer contour surface of the three-node pillar 24 in the vertical direction is flush with the fourth top plate 442, and the outer contour surface of the fourth support rib 443 in the vertical direction is flush with the fourth bottom plate 441.

In order to ensure the strength of the frame 7, the bolts 5 used are M20 high-strength bolts, and the specific strength grade can be 10.9 grade or 12.9 grade.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a corner fittings connection structure of prefabricated house connecting piece system which characterized in that: including corner fittings (3), corner fittings (3) are the L type, crossbeam (1) is connected to corner fittings (3) both ends opening part, corner fittings (3) adopt welded connection with crossbeam (1), connecting piece (4) are connected to both sides on the vertical side of corner fittings (3), connecting piece (4) adopt bolt (5) to be connected with corner fittings (3).

2. The corner fitting connection structure of a prefabricated building connecting fitting system according to claim 1, wherein: crossbeam (1) is the square roof beam of cavity, corner fittings (3) side opening part is equipped with spacing ring (33) towards crossbeam (1) direction extension, inside spacing ring (33) inserted crossbeam (1), crossbeam (1) butt corner fittings (3) side.

3. The corner fitting connecting structure of a prefabricated building connecting fitting system according to claim 2, wherein: the side surface of the corner fitting (3) is flush with the side surface of the cross beam (1).

4. The corner fitting connection structure of a prefabricated building connecting fitting system according to claim 1, wherein: both sides all are equipped with locating hole (31) and a plurality of screw hole (32) about corner fittings (3), screw hole (32) distribute around locating hole (31).

5. The corner fitting connection structure of a prefabricated building connecting fitting system according to claim 4, wherein: the connecting piece (4) comprises a single-node connecting piece (41), one single-node connecting piece (41) is connected with one corner piece (3), the single-node connecting piece (41) comprises a first base plate (411), the first base plate (411) is provided with a first through hole (415) which corresponds to the threaded hole (32) and penetrates through the first base plate (411), the bolt (5) penetrates through the first through hole (415) and is screwed into the threaded hole (32), a first limiting salient point (416) which corresponds to the positioning hole (31) of the single corner piece (3) is arranged in the first base plate (411) in an extending mode towards the corner piece (3), and the first limiting salient point (416) is inserted into the positioning hole (31) for positioning.

6. The corner fitting connection structure of a prefabricated building connecting fitting system according to claim 4, wherein: the connecting piece (4) comprises a double-node connecting piece (42), one double-node connecting piece (42) is connected with two corner pieces (3), the double-node connecting piece (42) comprises a second bottom plate (421), the second bottom plate (421) is provided with a second through hole (425) corresponding to the threaded holes (32) of the two corner pieces (3), the second through hole (425) penetrates through the second bottom plate (421), the bolt (5) penetrates through the second through hole (425) and is screwed into the threaded hole (32), a second limiting salient point (426) corresponding to the positioning holes (31) of the two corner pieces (3) extends outwards from the second bottom plate (421), and the second limiting salient point (426) is inserted into the positioning holes (31) of the two corner pieces (3) respectively for positioning.

7. The corner fitting connection structure of a prefabricated building connecting fitting system according to claim 4, wherein: the connecting piece (4) comprises four-node connecting pieces (43), one four-node connecting piece (43) is connected with four corner pieces (3), each four-node connecting piece (43) comprises a third bottom plate (431), each third bottom plate (431) is provided with a third through hole (435) corresponding to the threaded hole (32) of each corner piece (3), each third through hole (435) penetrates through each third bottom plate (431), each bolt (5) penetrates through each third through hole (435) and is screwed into each threaded hole (32), each third bottom plate (431) extends outwards to be provided with third limiting salient points (436) corresponding to the positioning holes (31) of the four corner pieces (3), and the third limiting salient points (436) are inserted into the positioning holes (31) of the four corner pieces (3) respectively for positioning.

8. The corner fitting connection structure of a prefabricated building connecting fitting system according to claim 4, wherein: the connecting piece (4) comprises three-node connecting pieces (44), one three-node connecting piece (44) is connected with three corner pieces (3), the three-node connecting piece (44) comprises a fourth bottom plate (441), the fourth bottom plate (441) is provided with a fifth through hole (445) corresponding to a threaded hole (32) of the three corner pieces (3), the fifth through hole (445) penetrates through the fourth bottom plate (441), a bolt (5) penetrates through the fifth through hole (445) and is screwed into the threaded hole (32), a fourth limiting convex point (446) corresponding to a positioning hole (31) of the three corner pieces (3) extends outwards from the fourth bottom plate (441), and the fourth limiting convex point (446) is inserted into the positioning holes (31) of the two corner pieces (3) respectively for positioning.

9. The corner fitting connection structure of a prefabricated building connecting fitting system according to claim 1, wherein: the angle fitting is characterized in that a plurality of reinforcing ribs (34) extend inwards in the angle fitting (3), and the reinforcing ribs (34) are L-shaped and consistent with the angle fitting (3) in direction.

10. The corner fitting connection structure of a prefabricated building connecting fitting system according to claim 1, wherein: still include stand (2), stand (2) are connected on corner fittings (3) through connecting piece (4), stand (2) and connecting piece (4) are through welded connection.

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