CN214329510U

CN214329510U - Four-slope light steel combined roof truss

Info

Publication number: CN214329510U
Application number: CN202022785015.7U
Authority: CN
Inventors: 赵成国
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-10-01
Anticipated expiration: 2030-11-26

Abstract

The utility model provides a four slope light steel combination roof racks for assembly type structure, including a plurality of triangle-shaped roof trusses 1, rectangle roof beam structure 2, two right angled triangle roof trusses 3 of both sides, four external corner inclined plane combination roof trusses 4 in four corners, a plurality of caulking strip type frame 5, a plurality of eaves piece 6 and a plurality of angle sign indicating number connecting piece 7, wherein a plurality of triangle-shaped roof trusses 1 parallel arrangement, rectangle roof beam structure 2 passes and uses a plurality of angle sign indicating number connecting piece 7 interconnect from the middle entrance to a cave of a plurality of triangle-shaped roof trusses 1, right angled triangle-shaped roof truss 3 sets up central line position and interconnect at both sides triangle-shaped roof trusses 1, four external corner inclined plane combination roof trusses 4 set up respectively in the roofing four corners, a plurality of caulking strip type frame 5 direct overlap joint are at the outer wall roof beam top and link to each other roof trusses, a plurality of eaves piece 6 and all around put up the welding of most advanced. This four slope light steel combination roof trusses make roofing structure's construction more accurate and convenient, and change in batch production, light transportation and the construction of assemblization.

Description

Four-slope light steel combined roof truss

Technical Field

The utility model relates to a building field especially relates to a four slope light steel combination roof trusses.

Background

The development of the building industry in China is extensive for a long time, the weight is not heavy, the consumption of steel, cement and red bricks is high at the first place of the world, and the development of the house industrialization process is still very slow in the first decade after the 21 st century. The consumption of resources and energy resources by the traditional building technology seriously supports the wealth of descendants of the Chinese, meanwhile, with the aging of population and the reduction of fertility, the labor cost continuously rises, and the construction cost continuously rises, so that the international competitiveness of Chinese building enterprises is gradually reduced, which is in sharp contrast with the identity of the large country of the Chinese manufacturing industry. Therefore, the traditional building needs industrial transformation urgently, and the industry is changed to the direction of heavy quality, heavy efficiency, heavy technology, low energy consumption and low pollution.

A series of policies are intensively issued in the late twelve and five countries to promote the rapid development of housing industrialization and building industrialization. The 'twelve five green buildings and green ecological region development plan' printed by the residential building department in 2013 firstly and definitely puts forward the accelerated formation of industrialized building systems such as fabricated concrete, steel structures and the like in China, the state department puts forward about 10 years of national force contention in 2016 so that the proportion of fabricated buildings to the newly built buildings reaches 30%, and the residential building department in 2017 further and definitely puts forward the proportion of fabricated buildings to the newly built buildings which accounts for more than 15% in 2020 all the country. In addition, a plurality of assembly type building construction and evaluation standards are issued one after another, matching policies are issued one after another in various provinces and regions to support the promotion of assembly type building implementation, the proportion target of the assembly type building in a newly built building is determined, and meanwhile, relevant subsidy and preferential policies are proposed.

Under the background of policy code adding and continuous upgrading of building technology, the area and the industry scale of the fabricated building in China are rapidly developed, but the subjective power of the fabricated building development in China is insufficient, and the method mainly comes from two reasons: firstly, the cost of the traditional cast-in-place building mode is still lower than that of an assembled building, and secondly, the traditional civil engineering construction enterprises and operators are more familiar with the cast-in-place process flow in the construction. The technical improvement of the assembly type building system taking a PC structure (precast concrete member) as the mainstream only considers the assembly of a construction layer, does not fully consider the time and labor cost of each link in the whole production and construction process, only finishes the steps of splitting the traditional cast-in-place building structure into structural members, then carrying out factory production, and then carrying out on-site assembly type installation, but causes the problems of low component standardization, large difference, large volume, long factory maintenance time, long culture period of qualified assemblers and the like, increases the difficulty of design, manufacture, transportation and installation, and increases the building cost on the contrary; the steel structure assembly type building cannot enjoy policy dividend in the years of the rapid development of the housing industrialization in China, and compared with a PC structure, the steel structure assembly type building has the advantages of higher industrialization degree, excellent anti-seismic performance, flexible structure, high housing rate and the like, but the steel structure in China is mainly applied to public buildings and industrial buildings, and the housing construction is less in application and mainly originates from three reasons: firstly, traditional civil engineering construction enterprises are more familiar with concrete technology and steel structure talents are relatively short, secondly, in high-rise residential projects, the price of a building with the same volume is 8% -15% higher than that of a PC structure by adopting a steel structure, and the concrete building is generally considered to be safer than the steel structure by the traditional concept of Chinese people.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to solving the above-described problems. The utility model provides a four-slope light steel combined roof truss.

The four-slope light steel combined roof truss comprises a plurality of triangular roof trusses, a rectangular beam frame, two right-angled triangular roof trusses on two sides, four external corner inclined plane combined roof trusses on four corners, a plurality of seam-plugging strip-shaped frames, a plurality of eave parts and a plurality of corner connector parts, wherein the triangular roof trusses are arranged in parallel and are lapped on the beam tops of front and rear outer walls, the rectangular beam truss penetrates through a middle cave of the triangular roof trusses and is connected with each other by the corner connector parts, the two right-angled triangular roof trusses are respectively arranged on the outer sides of left and right outer triangular roof trusses and are vertically intersected with the triangular roof trusses and are connected with each other by the corner connector parts, the four external corner inclined plane combined roof trusses are respectively arranged on the four corners of a roof, the vertical side on the inner side is welded with the triangular roof trusses and the right-angled triangular roof trusses simultaneously, the outer side is lapped on the column top of the outer wall, the seam-plugging strip-shaped frames are directly lapped on the beam tops, and the two ends of the other roof trusses are connected with other roof trusses, and the plurality of eave sealing pieces are arranged on the outermost side of the integral roof truss structure and are welded with the tips of the surrounding roof trusses.

Wherein, triangle-shaped roof truss includes first end fossil fragments, two waist fossil fragments, top seal fossil fragments, a plurality of first vertical joist and a plurality of first self tapping nail, and wherein first end fossil fragments, two waist fossil fragments, top seal fossil fragments all adopt the frame of cold-formed U shaped steel and enclose synthetic triangle-shaped roof truss, and a plurality of first vertical joist adopt the cold-formed C shaped steel that has truss lattice structure turn-up punching press hole and upper and lower both ends insert respectively in the notch of a plurality of first end fossil fragments and two waist fossil fragments and connect fixedly with a plurality of first self tapping nails.

Wherein, the rectangle roof beam structure includes second end fossil fragments, top fossil fragments, a plurality of second vertical keel and a plurality of second self tapping nail, and wherein second end fossil fragments and top fossil fragments all adopt the cold-formed U shaped steel, and a plurality of second vertical keel adopt the cold-formed C shaped steel that has truss lattice structure turn-up punching press hole to arrange according to equidistant and both ends insert respectively in the notch of second end fossil fragments and top fossil fragments and connect fixedly with the second self tapping nail about and.

The right-angled triangle roof truss comprises a third bottom keel, a bevel edge keel, a plurality of third vertical keels and a plurality of third self-tapping screws, wherein the third bottom keel and the bevel edge keel are both made of cold-formed U-shaped steel, the third vertical keels are made of cold-formed C-shaped steel with truss lattice structure crimping stamping holes, the third vertical keels are arranged at equal intervals, the upper ends and the lower ends of the third vertical keels are respectively inserted into notches of the third bottom keel and the bevel edge keel, and the third vertical keel are connected and fixed through the third self-tapping screws.

The external corner inclined plane combined roof truss comprises two fourth bottom keels, two inclined angle bevel edge keels, a plurality of fourth vertical keels, a specific inclined angle connecting piece and two bottom end connecting plates, wherein the two fourth bottom keels are arranged in a mouth-to-mouth mode through cold-formed C-shaped steel, the bottom end connecting plates are welded at the bottoms of two ends, then a specific inclined angle connecting piece is welded at the upper surface of each fourth bottom keel and the lapping position of the inclined angles to form a lower chord component, the two inclined angle bevel edge keels are arranged in a mouth-to-mouth mode through cold-formed C-shaped steel, the two specific inclined angle connecting pieces are welded at the middle position of the bottom surface and the end position of one side of the top portion to form a double-rod upper chord component with a specific inclined plane, the plurality of fourth vertical keels are rectangular tubes, the upper chord component is lapped on the specific inclined angle connecting piece on the upper surface of the lower chord component and welded, the plurality of fourth vertical keels are evenly arranged in gaps of the upper chord component and welded and fixed in the upper chord component through welding at equal intervals And then the assembly of the external corner inclined plane combined roof truss is completed.

The specific inclination angle connecting piece is formed by butt welding two symmetrical right-angled triangular first steel plates and two symmetrical second steel plates, wherein two bevel edges of the two steel plates are aligned and fixed on a vertical section according to an included angle of a specific angle, the specific angle and the roof slope form a one-to-one correspondence relationship, the numerical value of the specific angle is 158.9 degrees under the condition that the roof slope is 15 degrees, and the numerical value of the specific angle is 138.6 degrees under the condition that the roof slope is 30 degrees.

The assembly joint of the triangular roof truss and the rectangular beam frame is characterized in that the rectangular beam frame penetrates through a middle hollow part of the triangular roof truss firstly, then a plurality of corner connector connecting pieces are attached to the surfaces of keels at the joint of the triangular roof truss and the rectangular beam frame, and finally a plurality of fourth self-tapping screws are used for locking and fixing.

The assembly joint of the triangular roof truss, the right-angled triangular roof truss and the external corner slope combined roof truss is that the right-angled triangular roof truss is perpendicularly leaned on an external vertical face in the middle of the triangular roof truss, then a plurality of corner connector pieces are leaned on the surface of a keel at the joint of the triangular roof truss and the right-angled triangular roof truss and are locked and fixed by a plurality of fifth self-tapping screws, then the external corner slope combined roof truss is leaned on the joint of the triangular roof truss and the right-angled triangular roof truss in an angle of 45 degrees, and finally the specific inclination connector and the bottom connecting plate at the upper end of the external corner slope combined roof truss are welded with the triangular roof truss and the right-angled triangular roof truss simultaneously.

The plurality of caulking strip type frames are placed on the outer wall beam, and then the triangular roof truss, the right-angle triangular roof truss and the external corner inclined plane combined roof truss are welded with the plurality of caulking strip type frames clamped between the triangular roof truss, the right-angle triangular roof truss and the external corner inclined plane combined roof truss to form a complete roof truss structure.

The plurality of eave pieces are made of cold-formed C-shaped steel, openings of the C-shaped steel are arranged inwards, outer edges of the C-shaped steel are flush with tip ends of the roof trusses, and then the eave pieces and the roof trusses are welded to seal four edges of the combined roof truss.

The utility model discloses an assembly method of four slope light steel combination roof trusses for roofing structure construction changes in the assemblization, and the component changes in standardized and batch production, has greatly simplified the construction procedure of structure, has reduced the construction degree of difficulty, has practiced thrift construction cost, makes the prefabricated construction change in application and popularization.

Other characteristic features and advantages of the invention will become apparent from the following description of exemplary embodiments, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.

Fig. 1 exemplarily shows a three-dimensional structure view of the four-slope light steel combined roof truss of the present invention.

Fig. 2 exemplarily shows a three-dimensional structure diagram of a triangular roof truss of the present invention.

Fig. 3 is a perspective view schematically showing a rectangular beam frame according to the present invention.

Fig. 4 exemplarily shows a three-dimensional structure view of a right triangle roof truss of the present invention.

Fig. 5 exemplarily shows a three-dimensional structure view of an external corner inclined plane combination roof truss of the present invention.

Fig. 6 is a perspective view illustrating an exemplary specific inclination angle connector according to the present invention.

Fig. 7 schematically illustrates a vertical cross-section of a specific pitch angle connector according to the present invention.

Fig. 8 schematically shows an assembly joint between a triangular roof truss and a rectangular girder.

Fig. 9 exemplarily shows an assembly node schematic view of a triangular roof truss and a right-angled triangular roof truss and an external corner slope combination roof truss.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The method for assembling the four-slope light steel combination roof truss is described in detail below with reference to the accompanying drawings.

The first embodiment is as follows: as shown in figure 1, the four-slope light steel combination roof truss comprises a plurality of triangular roof trusses 1, a rectangular beam frame 2, two right-angled triangular roof trusses 3 at two sides, four external corner inclined plane combination roof trusses 4 at four corners, a plurality of seam-blocking strip-shaped frames 5, a plurality of eave sealing pieces 6 and a plurality of corner code connecting pieces 7, wherein the plurality of triangular roof trusses 1 are arranged in parallel and are arranged on the beam tops of front and rear outer walls, the rectangular beam frame 2 penetrates through a middle hole of the plurality of triangular roof trusses 1 and is connected with each other by the plurality of corner code connecting pieces 7, the two right-angled triangular roof trusses 3 are respectively arranged at the outer sides of the left and right external side triangular roof trusses 1 and are vertically intersected with each other and are connected with each other by the plurality of corner code connecting pieces 7, the four external corner inclined plane combination roof trusses 4 are respectively arranged at four corners of a roof, the vertical sides at the same time are welded with the triangular roof trusses 1 and the right-angled triangular roof trusses 3, the outer sides are lapped on the column tops of the outer walls, the plurality of seam-blocking strip-shaped frames 5 are directly lapped on the outer wall beam tops and two ends are connected with other roof trusses, and a plurality of eave sealing pieces 6 are arranged at the outermost side of the integral roof truss structure and are welded with the tips of the surrounding roof trusses.

The second embodiment is as follows: the triangular roof truss 1 shown in fig. 2 comprises a first bottom keel 11, two waist keels 12, a top sealing keel 13, a plurality of first vertical keels 14 and a plurality of first self-tapping screws 15, wherein the first bottom keel 11, the two waist keels 12 and the top sealing keel 13 are all made of cold-formed U-shaped steel and enclose an outer frame of the triangular roof truss 1, the first vertical keels 14 are made of cold-formed C-shaped steel with truss grid structure hemming stamping holes, and the upper end and the lower end of each of the first vertical keels 14 are respectively inserted into notches of the first bottom keels 11 and the second waist keels 12 and are connected and fixed through the first self-tapping screws 15.

The third concrete implementation mode: the rectangular beam frame 2 shown in fig. 3 includes a second bottom keel 21, a top keel 22, a plurality of second vertical keels 23 and a plurality of second self-tapping screws 24, wherein the second bottom keel 21 and the top keel 22 are both made of cold-formed U-shaped steel, the plurality of second vertical keels 23 are made of cold-formed C-shaped steel with truss lattice structure crimping punching holes and are arranged at equal intervals, and the upper and lower ends of the cold-formed C-shaped steel are respectively inserted into the notches of the second bottom keel 21 and the top keel 22 and are connected and fixed by the second self-tapping screws 24.

The fourth concrete implementation mode: the right-angled triangular roof truss 3 shown in fig. 4 comprises a third bottom keel 31, a bevel edge keel 32, a plurality of third vertical keels 33 and a plurality of third self-tapping screws 34, wherein the third bottom keel 31 and the bevel edge keel 32 are both made of cold-formed U-shaped steel, the third vertical keels 33 are made of cold-formed C-shaped steel with truss grid structure crimping punching holes and are arranged at equal intervals, and the upper end and the lower end of each cold-formed C-shaped steel are respectively inserted into the notches of the third bottom keel 31 and the bevel edge keel 32 and are connected and fixed through the third self-tapping screws 34.

The fifth concrete implementation mode: the external corner inclined plane combination roof truss 4 as shown in fig. 5 comprises two fourth bottom keels 41, two inclined angle bevel edge keels 42, a plurality of fourth vertical keels 43, specific inclined angle connectors 44 and two bottom end connecting plates 45, wherein the two fourth bottom keels 41 are arranged in a mouth-to-mouth manner by adopting cold-formed C-shaped steel, the bottom end connecting plates 45 are welded at the bottoms of the two ends, then a specific inclined angle connector 44 is welded at the overlapping position of the upper surface and the inclined edges of the fourth bottom keel 41 to form a lower chord assembly, the two inclined angle bevel edge keels 42 are arranged in a mouth-to-mouth manner by adopting cold-formed C-shaped steel, and simultaneously the two specific inclined angle connectors 44 are respectively welded at the middle position of the bottom surface and the end position of one side of the top part to form a double-rod type upper chord assembly with a specific inclined plane, the plurality of fourth vertical keels 43 are made of rectangular pipes, then the upper chord assembly is overlapped on the specific inclined angle connectors 44 on the upper surface of the lower chord assembly and welded, and then a plurality of fourth vertical keels 43 are uniformly arranged at equal intervals, inserted into the gaps of the upper chord assembly and the lower chord assembly and welded and fixed, and the assembly of the external corner inclined plane combined roof truss 4 is completed.

The sixth specific implementation mode: the specific inclination angle connector 44 shown in fig. 6 and 7 is formed by butt welding two symmetrical right-angled triangular first and

second steel plates

441 and 442, wherein two oblique sides of the first and

second steel plates

441 and 442 are aligned and fixed at an included angle of a specific angle 443 on a vertical section, wherein the specific angle 443 and the roof slope form a one-to-one correspondence, the value of the specific angle 443 is 158.9 ° in the case of a roof slope of 15 °, and the value of the specific angle 443 is 138.6 ° in the case of a roof slope of 30 °.

The seventh embodiment: the assembly joint of the triangular roof truss 1 and the rectangular beam frame 2 shown in fig. 8 is characterized in that the rectangular beam frame 2 firstly penetrates through a middle hole of the triangular roof truss 1, then a plurality of corner connector connecting pieces 7 are attached to the surfaces of keels at the joint of the triangular roof truss 1 and the rectangular beam frame 2, and finally a plurality of fourth self-tapping screws 8 are used for locking and fixing.

The specific implementation mode is eight: as shown in fig. 9, the assembly joint of the triangular roof truss 1, the right-angled triangular roof truss 3 and the external corner slope combined roof truss 4 is that the right-angled triangular roof truss 3 vertically leans against the external vertical surface in the middle of the triangular roof truss 1, then a plurality of corner connectors 7 are attached to the keel surface at the joint of the triangular roof truss 1 and the right-angled triangular roof truss 3 and locked and fixed by a plurality of fifth self-tapping nails 9, then the external corner slope combined roof truss 4 is attached to the joint of the triangular roof truss 1 and the right-angled triangular roof truss 3 in a 45-degree angle, and finally the specific inclination connector 44 and the bottom end connecting plate 45 at the upper end of the external corner slope combined roof truss 4 are welded with the triangular roof truss 1 and the right-angled triangular roof truss 3 at the same time.

The specific implementation method nine: as shown in fig. 1, in order to stabilize the roof truss structure and fill up the gap between the roof and the wall surface, a plurality of caulking strip type frames 5 are placed on the outer wall beam, and then the triangular roof truss 1, the right-angled triangular roof truss 3, the external corner inclined plane combined roof truss 4 and the plurality of caulking strip type frames 5 clamped between the triangular roof truss 1, the right-angled triangular roof truss 3 and the external corner inclined plane combined roof truss are welded together to form a complete roof truss structure.

The detailed implementation mode is ten: as shown in fig. 1, a plurality of eave pieces 6 are made of cold-formed C-shaped steel, openings of the C-shaped steel are arranged inwards, outer edges of the C-shaped steel are flush with the tip end of the roof truss, and then the eave pieces 6 are welded with the roof truss to seal four edges of the combined roof truss.

The utility model discloses an assembly method of four slope light steel combination roof trusses for the installation of roofing structure is more simple and efficient, the component is changed in standardization, batch production processing, has greatly simplified the construction process of structure, has reduced the construction degree of difficulty, has practiced thrift construction cost, makes the prefabricated construction change in application and popularization.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.

The above embodiments are merely for illustrating the technical solutions of the present invention and are not to be construed as limiting, and the present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all the modifications and equivalents should be covered by the scope of the claims of the present invention.

Claims

1. A four-slope light steel combined roof truss is characterized by comprising a plurality of triangular roof trusses (1), a rectangular beam frame (2), two right-angled triangular roof trusses (3) on two sides, four external corner slope combined roof trusses (4) on four corners, a plurality of seam-blocking strip-shaped frames (5), a plurality of eave sealing pieces (6) and a plurality of corner connector pieces (7), wherein the triangular roof trusses (1) are arranged in parallel and are erected on beam tops of front and rear outer walls, a hole is formed in the middle of a vertical face of the triangular roof trusses (1), the rectangular beam frame (2) penetrates through the hole and is connected through the corner connector pieces (7), the two right-angled triangular roof trusses (3) are respectively arranged on the outer sides of the left and right external side triangular roof trusses (1) and are vertically intersected with the outer sides and are connected with the corner connector pieces (7), the four external corner slope combined roof trusses (4) are respectively arranged at four corners of a roof, the inner side vertical edge is welded with the triangular roof truss (1) and the right-angled triangular roof truss (3) simultaneously, the outer side is overlapped at the column top of the outer wall, a plurality of seam plugging strip-shaped frames (5) are directly overlapped at the beam top of the outer wall, two ends of the seam plugging strip-shaped frames are connected with other roof trusses, and a plurality of eave sealing pieces (6) are arranged at the outermost edge of the whole roof truss structure and are welded with the tips of the surrounding roof trusses.

2. The four-slope light steel combined roof truss according to claim 1, wherein the triangular roof truss (1) comprises a first bottom keel (11), two waist keels (12), a top sealing keel (13), a plurality of first vertical keels (14) and a plurality of first self-tapping nails (15), wherein the first bottom keel (11), the two waist keels (12) and the top sealing keel (13) are all made of cold-formed U-shaped steel and enclose an outer frame of the triangular roof truss (1), the plurality of first vertical keels (14) are made of cold-formed C-shaped steel with truss grid structure crimping stamping holes, and the upper end and the lower end of each cold-formed C-shaped steel are respectively inserted into notches of the plurality of first bottom keels (11) and the two waist keels (12) and are connected and fixed through the plurality of first self-tapping nails (15).

3. The four-slope light steel combined roof truss according to claim 1, wherein the rectangular beam frame (2) comprises a second bottom keel (21), a top keel (22), a plurality of second vertical keels (23) and a plurality of second self-tapping screws (24), wherein the second bottom keel (21) and the top keel (22) are both made of cold-formed U-shaped steel, the plurality of second vertical keels (23) are made of cold-formed C-shaped steel with truss lattice structure curled stamping holes and are arranged at equal intervals, and the upper end and the lower end of each second vertical keel are respectively inserted into the notches of the second bottom keel (21) and the top keel (22) and are connected and fixed through the second self-tapping screws (24).

4. The four-slope light steel combined roof truss according to claim 1, wherein the right-angled triangle roof truss (3) comprises a third bottom keel (31), a bevel edge keel (32), a plurality of third vertical keels (33) and a plurality of third self-tapping screws (34), wherein the third bottom keel (31) and the bevel edge keel (32) are both made of cold-formed U-shaped steel, the plurality of third vertical keels (33) are made of cold-formed C-shaped steel with truss lattice structure crimping punching holes and are arranged at equal intervals, and the upper end and the lower end of each of the plurality of third vertical keels are respectively inserted into the notches of the third bottom keel (31) and the bevel edge keel (32) and are connected and fixed through the plurality of third self-tapping screws (34).

5. The four-slope light steel combination roof truss as claimed in claim 1, wherein the external corner slope combination roof truss (4) comprises two fourth bottom keels (41), two oblique angle slope keels (42), a plurality of fourth vertical keels (43), specific oblique angle connectors (44) and two bottom end connection plates (45), wherein the two fourth bottom keels (41) are arranged in an opening-to-opening mode by adopting cold-formed C-shaped steel, the bottom end connection plates (45) are welded at the bottoms of the two ends, one specific oblique angle connector (44) is welded at the overlapping position of the upper surface and the oblique edges of the fourth bottom keels (41) to form a lower chord assembly, the two oblique angle slope angle slope keels (42) are arranged in an opening-to-opening mode and are welded at the middle position of the bottom surface and the end position of one side of the top portion by adopting two specific oblique angle connectors (44) respectively to form a double-chord assembly with a specific oblique surface, the four vertical keels (43) are rectangular tubes, the upper chord assembly is lapped on a specific inclination angle connecting piece (44) on the upper surface of the lower chord assembly and welded, the four vertical keels (43) are arranged between the upper chord assembly and the lower chord assembly, and the four vertical keels (43) are evenly arranged at equal intervals.

6. The four-slope light steel combined roof truss as recited in claim 5, characterized in that the specific inclination angle connecting piece (44) is formed by butt welding two symmetrical right-angled triangular first steel plates (441) and second steel plates (442), wherein the two hypotenuses of the first steel plates (441) and the second steel plates (442) are aligned and fixed in vertical section at an included angle of a specific angle (443), the specific angle (443) and the roof slope form a one-to-one correspondence, the specific angle (443) has a value of 158.9 ° in case of the roof slope being 15 °, and the specific angle (443) has a value of 138.6 ° in case of the roof slope being 30 °.

7. The four-slope light steel combined roof truss according to claim 1, wherein the assembly joint of the triangular roof truss (1) and the rectangular beam frame (2) is formed by arranging a hole in the middle of the vertical surface of the triangular roof truss (1), the rectangular beam frame (2) penetrates through the hole, a plurality of corner connector pieces (7) are arranged on the keel surface at the joint of the triangular roof truss (1) and the rectangular beam frame (2), and a plurality of fourth self-tapping nails (8) are arranged on the corner connector pieces (7) and used for locking and fixing.

8. The four-slope light steel combined roof truss according to claim 1, wherein the assembly node of the triangular roof truss (1), the right-angled triangular roof truss (3) and the external corner slope combined roof truss (4) is that the right-angled triangular roof truss (3) vertically leans against the outer vertical surface in the middle of the triangular roof truss (1), a plurality of corner connector (7) are arranged at the joint of the triangular roof truss (1) and the right-angled triangular roof truss (3), a plurality of fifth self-tapping nails (9) are arranged on the corner connector (7) for locking and fixing, the external corner slope combined roof truss (4) leans against the intersection of the triangular roof truss (1) and the right-angled triangular roof truss (3) in a 45-degree angle, the special dip angle connecting piece (44) and the bottom end connecting plate (45) at the upper end of the external corner inclined plane combined roof truss (4) are welded with the triangular roof truss (1) and the right-angled triangular roof truss (3) at the same time.

9. A four-slope light steel composite roof truss according to claim 1, wherein a plurality of caulking strip type frames (5) are arranged between the triangular roof truss (1), the right-angled triangular roof truss (3) and the external corner slope composite roof truss (4), and a plurality of caulking strip type frames (5) are arranged on the external wall beam, and the joints of the above components are welded to form a complete roof truss structure.

10. A four-slope light steel composite roof truss according to claim 1, wherein a plurality of eave members (6) are formed by cold-bending C-shaped steel, the openings of the C-shaped steel are inwardly arranged, the outer edges of the C-shaped steel are flush with the tip of the roof truss structure, and the eave members (6) are welded to the roof truss structure to form closed eaves on four sides of the composite roof truss.