A spatial grid truss structure and construction method

Abstract

The present invention discloses a space grid truss structure and a construction method, including a space grid truss structure which comprises a plurality of steel trusses that can be welded and assembled to form a space grid structure. The steel truss includes a web column mechanism, an upper cross and a lower cross. In the present invention, a single steel truss is simple and quick to assemble and has a stable structure. A plurality of steel trusses are respectively assembled and welded longitudinally and transversely to form a truss network in a space grid shape with uniform and complete structure. The shape and area of the truss network can be adjusted according to actual construction requirements, and the erection is convenient and fast, which helps to improve the construction efficiency. The erected space grid truss not only has uniform overall structural stress and material saving, but also can solve the problem of insufficient net space of large-span structures and meet the requirements of a single steel truss for the ultimate limit state of bearing capacity and the serviceability limit state.

Description

Technical Field

[0001] The present invention relates to the field of steel truss structures, and particularly to a space grid truss structure and a construction method thereof. Background Art

[0002] With the vigorous development of urban construction, grand and innovative designs have become increasingly prominent. On the premise of meeting functional requirements, architectural demands are gradually developing towards the direction of beauty, novelty, and uniqueness. To meet the architectural demands of large spans and large spaces, space grid truss architectural structures have become essential for modern public buildings.

[0003] The space grid truss architectural structure is a brand-new architectural form, with the advantages of stability and firmness, and can solve the construction problems of large spans, large cross-sections, and heavy weights. However, precisely because the space grid truss has a large span and a relatively high requirement for headroom, the existing structural forms of space grids can no longer meet the requirements of the truss for the ultimate limit state of bearing capacity and the normal use limit state, and there are problems such as laborious overall structure erection, uneven stress, and waste of steel consumption. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a space grid truss structure and a construction method thereof that are convenient to erect, have uniform stress, save materials, and can solve the problem of insufficient headroom in large-span structures.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A space grid truss structure includes a plurality of steel trusses that can be welded and assembled to form a space grid structure. The steel truss includes a web column mechanism, an upper cross, and a lower cross. The upper cross and the lower cross are respectively inserted into the top and bottom of the web column mechanism and welded and fixed.

[0006] Further, the web column mechanism includes a column, an upper partition plate, and a lower partition plate. The column is a square column tube structure with a rectangular cross-section. The upper partition plate and the lower partition plate are symmetrically welded to the upper and lower ends inside the column respectively, and are both fixed by groove welding with backing strips.

[0007] Further, the upper cross includes an upper chord beam and an upper T-beam. The upper chord beam and the upper T-beam intersect perpendicularly to form a cross-shaped structure and are fixed by full penetration welding.

[0008] Further, the upper chord beam includes an upper flange plate and an upper web plate. The upper flange plate is horizontally arranged, the upper web plate is vertically arranged, the upper flange plate and the upper web plate are of equal length, the upper web plate is welded to the bottom of the upper flange plate in the middle, and is fixed by groove welding.

[0009] Furthermore, the upper T-shaped beam includes an upper horizontal steel plate and an upper vertical steel plate. The upper horizontal steel plate is horizontally arranged, the upper vertical steel plate is vertically arranged, the upper horizontal steel plate and the upper vertical steel plate are of equal length, the upper vertical steel plate is centered and welded to the bottom of the upper horizontal steel plate, and fixed by groove welding.

[0010] Furthermore, the lower cross is composed of a lower chord beam and a lower T-shaped beam. The lower cross is of the same size as the upper cross. The lower chord beam and the lower T-shaped beam are perpendicularly intersected to form a cross-shaped structure, and fixed by full penetration welding.

[0011] Furthermore, the lower chord beam includes a lower flange plate and a lower web plate. The lower flange plate is horizontally arranged, the lower web plate is vertically arranged, the lower flange plate and the lower web plate are of equal length, the lower web plate is centered and welded to the top of the lower flange plate, and fixed by groove welding.

[0012] Furthermore, the lower T-shaped beam includes a lower horizontal steel plate and a lower vertical steel plate. The lower horizontal steel plate is horizontally arranged, the lower vertical steel plate is vertically arranged, the lower horizontal steel plate and the lower vertical steel plate are of equal length, the lower vertical steel plate is centered and welded to the top of the lower horizontal steel plate, and fixed by groove welding.

[0013] Furthermore, the column is respectively centered with equally long slots around the four peripheries of the upper pipe orifice and the four peripheries of the lower pipe orifice. The length of the slots is equal to the widths of the upper web plate, the upper vertical steel plate, the lower web plate, and the lower vertical steel plate.

[0014] The upper web plate and the upper vertical steel plate welded and fixed in a cross-shaped structure are respectively inserted downward along the slots at the upper pipe orifice until the upper flange plate and the upper horizontal steel plate welded and fixed in a cross-shaped structure abut against the upper pipe orifice of the column, and the upper web plate or the upper vertical steel plate abuts against the upper partition plate. A gasket is set and the upper cross is fixed by groove welding.

[0015] The lower web plate and the lower vertical steel plate welded and fixed in a cross-shaped structure are respectively inserted upward along the slots at the lower pipe orifice until the lower flange plate and the lower horizontal steel plate welded and fixed in a cross-shaped structure abut against the lower pipe orifice of the column, and the lower web plate or the lower vertical steel plate abuts against the lower partition plate. A gasket is set and the lower cross is fixed by groove welding.

[0016] A construction method for a space grid truss structure, characterized by comprising the following steps:

[0017] Step 1: Assemble the abdominal column mechanism. Respectively place the upper partition plate and the lower partition plate at equal-distance positions at the upper and lower ends inside the column, and set gaskets and fix them by groove welding.

[0018] Step 2: Centrally open the same-length slots on the peripheries of the upper pipe orifice and the lower pipe orifice of the column respectively, and the length of the slot is equal to the height of the upper partition or the lower partition from the upper pipe orifice or the lower pipe orifice;

[0019] Step 3: Assemble the upper cross, first assemble the upper chord beam, centrally fix the upper web plate to the bottom of the upper flange plate in the form of groove welding, then assemble the upper T-beam, centrally fix the upper vertical steel plate to the bottom of the upper horizontal steel plate in the form of groove welding, and finally fix the upper chord beam and the upper T-beam to intersect vertically in a cross-shaped structure in the form of full penetration welding;

[0020] Step 4: Assemble the lower cross, first assemble the lower chord beam, centrally fix the lower web plate to the top of the lower flange plate in the form of groove welding, then assemble the lower T-beam, centrally fix the lower vertical steel plate to the top of the lower horizontal steel plate in the form of groove welding, and finally fix the lower chord beam and the lower T-beam to intersect vertically in a cross-shaped structure in the form of full penetration welding;

[0021] Step 5: Align and insert the upper cross into the slot at the upper pipe orifice of the column, set a gasket and fix the upper chord beam and the upper T-beam to the top of the column in sequence in the form of groove welding;

[0022] Step 6: Align and insert the lower cross into the slot at the lower pipe orifice of the column, set a gasket and fix the lower chord beam and the lower T-beam to the bottom of the column in sequence in the form of groove welding;

[0023] Step 7: Assemble and weld multiple assembled steel trusses longitudinally or transversely respectively until a steel truss unit with a space grid structure is expanded.

[0024] The beneficial effects of the present invention are embodied in:

[0025] In the present invention, a single steel truss is simple and fast to assemble and has a stable structure. Multiple steel trusses are assembled and welded longitudinally and transversely respectively to form a truss network with a uniform and complete space grid shape. The shape and area of the truss network can be adjusted according to actual construction requirements, and the erection is convenient and fast, which helps to improve construction efficiency. The erected space grid truss not only has a uniform overall structural stress and saves materials, but also can solve the problem of insufficient clear space in large-span structures, meeting the requirements of a single steel truss for the ultimate limit state of bearing capacity and the normal use limit state. Description of the Drawings

[0026] Figure 1 It is a splicing schematic diagram of multiple steel trusses with a space grid structure in an embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the longitudinal splicing of a steel truss according to an embodiment of the present invention.

[0028] Figure 3 It is a schematic diagram of the transverse splicing of a steel truss according to an embodiment of the present invention.

[0029] Figure 4 It is a perspective view of a steel truss according to an embodiment of the present invention.

[0030] Figure 5 It is a perspective view of a web column mechanism according to an embodiment of the present invention.

[0031] Figure 6 It is a front structural perspective view of a web column mechanism according to an embodiment of the present invention.

[0032] Figure 7 It is a perspective view of an upper cross member according to an embodiment of the present invention.

[0033] Figure 8 It is a perspective view of an upper chord beam according to an embodiment of the present invention.

[0034] Figure 9 It is a perspective view of an upper T-shaped beam according to an embodiment of the present invention.

[0035] Figure 10 It is a perspective view of a lower cross member according to an embodiment of the present invention.

[0036] Figure 11 It is a perspective view of a lower chord beam according to an embodiment of the present invention.

[0037] Figure 12 It is a perspective view of a lower T-shaped beam according to an embodiment of the present invention.

[0038] The marks of each component in the drawings are as follows: 1, steel truss; 2, web column mechanism; 3, upper cross member; 4, lower cross member; 5, column; 501, slotted; 6, upper partition plate; 7, lower partition plate; 8, upper chord beam; 801, upper flange plate; 802, upper web plate; 9, upper T-shaped beam; 901, upper horizontal steel plate; 902, upper vertical steel plate; 10, lower chord beam; 1001, lower flange plate; 1002, lower web plate; 11, lower T-shaped beam; 1101, lower horizontal steel plate; 1102, lower vertical steel plate. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly; in addition, "a plurality" means more than four; terms such as "groove welding" and "full penetration welding" are welding forms specified in relevant national codes and standards.

[0040] See Figures 1-12 。

[0041] The present invention provides a space grid truss structure, which includes a plurality of steel trusses 1 that can be welded and assembled to form a space grid structure. The steel truss 1 includes a web column mechanism 2, an upper cross 3, and a lower cross 4. The upper cross 3 and the lower cross 4 are respectively inserted into the top and bottom of the web column mechanism 2 and welded and fixed.

[0042] In the present invention, a single steel truss is simple and fast to assemble, and has a stable structure. A plurality of steel trusses are respectively assembled and welded longitudinally and transversely to form a truss network in a space grid shape with uniform and complete structure. The shape and area of the truss network can be adjusted according to actual construction requirements, and the construction is convenient and fast, which helps to improve the construction efficiency. The completed space grid truss not only has a uniform overall structure stress and material saving, but also can solve the problem of insufficient clear height of large-span structures, and meet the requirements of a single steel truss for the ultimate limit state of bearing capacity and the normal use limit state.

[0043] In one embodiment, the web column mechanism 2 includes a column 5, an upper partition 6, and a lower partition 7. The column 5 has a square column tube structure with a rectangular cross-section. The upper partition 6 and the lower partition 7 are symmetrically welded to the upper and lower ends inside the column 5 respectively, and a backing is provided and fixed by groove welding. Designed in this way, the column 5, the upper partition 6, and the lower partition 7 are assembled by welding to form the web column mechanism 2. The web column mechanism 2 provides the core support capacity for the construction of a single steel truss 1, and the upper partition 6 and the lower partition 7 play a role in strengthening the support strength of the column 5.

[0044] In one embodiment, the upper cross 3 includes an upper chord beam 8 and an upper T-shaped beam 9. The upper chord beam 8 and the upper T-shaped beam 9 are perpendicularly intersected to form a cross-shaped structure and fixed by full penetration welding. Designed in this way, the upper chord beam 8 and the upper T-shaped beam 9 are assembled by welding to form the upper cross 3. The upper cross 3 is fixed on the top of the web column mechanism 2 to provide a load-bearing platform for a single steel truss 1.

[0045] In one embodiment, the upper chord beam 8 includes an upper flange plate 801 and an upper web plate 802. The upper flange plate 801 is horizontally arranged, the upper web plate 802 is vertically arranged, the upper flange plate 801 and the upper web plate 802 are of equal length, the upper web plate 802 is centrally welded to the bottom of the upper flange plate 801, and fixed by groove welding. With such a design, the upper flange plate 801 and the upper web plate 802 are assembled by welding to form the upper chord beam 8 with a T-shaped structure. The upper chord beam 8 has a firm structure and high strength.

[0046] In one embodiment, the upper T-shaped beam 9 includes an upper horizontal steel plate 901 and an upper vertical steel plate 902. The upper horizontal steel plate 901 is horizontally arranged, the upper vertical steel plate 902 is vertically arranged, the upper horizontal steel plate 901 and the upper vertical steel plate 902 are of equal length, the upper vertical steel plate 902 is centrally welded to the bottom of the upper horizontal steel plate 901, and fixed by groove welding. With such a design, the upper horizontal steel plate 901 and the upper vertical steel plate 902 are assembled by welding to form the upper T-shaped beam 9 with a T-shaped structure. The upper T-shaped beam 9 has a firm structure and high strength.

[0047] In one embodiment, the lower cross 4 includes a lower chord beam 10 and a lower T-shaped beam 11. The lower cross 4 has the same size as the upper cross 3. The lower chord beam 10 and the lower T-shaped beam 11 intersect perpendicularly to form a cross-shaped structure, and are fixed by full penetration welding. With such a design, the lower chord beam 10 and the lower T-shaped beam 11 are assembled by welding to form the lower cross 4. The lower cross 4 is fixed at the bottom of the web column mechanism 2 to provide a support platform for a single steel truss 1.

[0048] In one embodiment, the lower chord beam 10 includes a lower flange plate 1001 and a lower web plate 1002. The lower flange plate 1001 is horizontally arranged, the lower web plate 1002 is vertically arranged, the lower flange plate 1001 and the lower web plate 1002 are of equal length, the lower web plate 1002 is centrally welded to the top of the lower flange plate 1001, and fixed by groove welding. With such a design, the lower flange plate 1001 and the lower web plate 1002 are assembled by welding to form the lower chord beam 10 with a T-shaped structure. The lower chord beam 10 has a firm structure and high strength.

[0049] In one embodiment, the lower T-shaped beam 11 includes a lower horizontal steel plate 1101 and a lower vertical steel plate 1102. The lower horizontal steel plate 1101 is horizontally arranged, and the lower vertical steel plate 1102 is vertically arranged. The lower horizontal steel plate 1101 and the lower vertical steel plate 1102 are of equal length. The lower vertical steel plate 1102 is welded to the top of the lower horizontal steel plate 1101 at the center and fixed by groove welding. With such a design, the lower horizontal steel plate 1101 and the lower vertical steel plate 1102 are assembled by welding to form the lower T-shaped beam 11 with a T-shaped structure, and the lower T-shaped beam 11 has a strong structure and high strength.

[0050] In one embodiment, the column 5 is respectively provided with equally long slots 501 at the four perimeters of the upper pipe orifice and the four perimeters of the lower pipe orifice at the center. The length of the slot 501 is equal to the widths of the upper web 802, the upper vertical steel plate 902, the lower web 1002, and the lower vertical steel plate 1102.

[0051] The upper web 802 and the upper vertical steel plate 902 welded and fixed in a cross-shaped structure are respectively inserted downward along the slot 501 located at the upper pipe orifice until the upper flange plate 801 and the upper horizontal steel plate 901 welded and fixed in a cross-shaped structure abut against the upper pipe orifice of the column 5, and the upper web 802 or the upper vertical steel plate 902 abuts against the upper partition plate 6, and a backing is provided and the upper cross 3 is fixed by groove welding.

[0052] The lower web 1002 and the lower vertical steel plate 1102 welded and fixed in a cross-shaped structure are respectively inserted upward along the slot 501 located at the lower pipe orifice until the lower flange plate 1001 and the lower horizontal steel plate 1101 welded and fixed in a cross-shaped structure abut against the lower pipe orifice of the column 5, and the lower web 1002 or the lower vertical steel plate 1102 abuts against the lower partition plate 7, and a backing is provided and the lower cross 4 is fixed by groove welding. With such a design, the upper cross 3 and the lower cross 4 are respectively inserted and installed at the top and bottom of the abdominal column mechanism 2. The upper web 802, the upper vertical steel plate 902, the lower web 1002, and the lower vertical steel plate 1102 are respectively inserted into the slot 501 and welded and fixed, and the two ends of the upper web 802, the upper vertical steel plate 902, the lower web 1002, and the lower vertical steel plate 1102 are also respectively welded and fixed to the upper flange plate 801, the upper horizontal steel plate 901, the lower flange plate 1001, the lower horizontal steel plate 1101, and the upper partition plate 6 or the lower partition plate 7, making the structure of a single steel truss 1 more stable and firm.

[0053] A construction method for a space grid truss structure, characterized by comprising the following steps:

[0054] Step 1: Assemble the abdominal column mechanism 2. Place the upper partition plate 6 and the lower partition plate 7 at equidistant positions at the upper and lower ends inside the column 5 respectively, and set gaskets and fix them by groove welding.

[0055] Step 2: Centrally open equal-length slots 501 on the four peripheries of the upper pipe orifice and the lower pipe orifice of the column 5 respectively, and the length of the slot 501 is equal to the height of the upper partition plate 6 or the lower partition plate 7 from the upper pipe orifice or the lower pipe orifice.

[0056] Step 3: Assemble the upper cross 3. First, assemble the upper chord beam 8, and fix the upper web plate 802 in the center to the bottom of the upper flange plate 801 by groove welding. Then, assemble the upper T-beam 9, and fix the upper vertical steel plate 902 in the center to the bottom of the upper horizontal steel plate 901 by groove welding. Finally, fix the upper chord beam 8 and the upper T-beam 9 in a perpendicular cross-shaped structure by full penetration welding.

[0057] Step 4: Assemble the lower cross 4. First, assemble the lower chord beam 10, and fix the lower web plate 1002 in the center to the top of the lower flange plate 1001 by groove welding. Then, assemble the lower T-beam 11, and fix the lower vertical steel plate 1102 in the center to the top of the lower horizontal steel plate 1101 by groove welding. Finally, fix the lower chord beam 10 and the lower T-beam 11 in a perpendicular cross-shaped structure by full penetration welding.

[0058] Step 5: Align and insert the upper cross 3 into the slot 501 at the upper pipe orifice of the column 5, and set gaskets and fix the upper chord beam 8 and the upper T-beam 9 to the top of the column 5 in sequence by groove welding.

[0059] Step 6: Align and insert the lower cross 4 into the slot 501 at the lower pipe orifice of the column 5, and set gaskets and fix the lower chord beam 10 and the lower T-beam 11 to the bottom of the column 5 in sequence by groove welding.

[0060] Step 7: Assemble and weld multiple assembled steel trusses 1 longitudinally or transversely until a steel truss unit with a space grid structure is expanded.

[0061] It should be understood that the examples and embodiments described herein are only for illustration and are not used to limit the present invention. Those skilled in the art can make various modifications or changes according to it. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A space grid truss structure, characterized in that: It includes multiple steel trusses (1) that can be welded and assembled to form a space grid structure. The steel truss (1) includes a web column mechanism (2), an upper cross (3), and a lower cross (4). The upper cross (3) and the lower cross (4) are respectively inserted into the top and bottom of the web column mechanism (2) and welded and fixed. The web column mechanism (2) includes a column (5), an upper partition plate (6), and a lower partition plate (7). The column (5) has a square column tube structure with a rectangular cross-section. The upper partition plate (6) and the lower partition plate (7) are symmetrically welded to the upper end and the lower end inside the column (5) respectively, and a backing is provided and fixed by groove welding.

2. The space grid truss structure according to claim 1, characterized in that: The upper cross (3) includes an upper chord beam (8) and an upper T-beam (9). The upper chord beam (8) and the upper T-beam (9) intersect perpendicularly to form a cross-shaped structure and are fixed by full penetration welding.

3. The space grid truss structure according to claim 2, characterized in that: The upper chord beam (8) includes an upper flange plate (801) and an upper web plate (802). The upper flange plate (801) is horizontally arranged, the upper web plate (802) is vertically arranged. The upper flange plate (801) and the upper web plate (802) are of equal length. The upper web plate (802) is welded to the bottom of the upper flange plate (801) in the middle and fixed by groove welding.

4. The space grid truss structure according to claim 3, wherein: The upper T-beam (9) includes an upper horizontal steel plate (901) and an upper vertical steel plate (902). The upper horizontal steel plate (901) is horizontally arranged, the upper vertical steel plate (902) is vertically arranged. The upper horizontal steel plate (901) and the upper vertical steel plate (902) are of equal length. The upper vertical steel plate (902) is welded to the bottom of the upper horizontal steel plate (901) in the middle and fixed by groove welding.

5. The space grid truss structure according to claim 4, wherein: The lower cross (4) includes a lower chord beam (10) and a lower T-beam (11). The lower cross (4) has the same size as the upper cross (3). The lower chord beam (10) and the lower T-beam (11) intersect perpendicularly to form a cross-shaped structure and are fixed by full penetration welding.

6. The space grid truss structure according to claim 5, wherein: The lower chord beam (10) includes a lower flange plate (1001) and a lower web plate (1002). The lower flange plate (1001) is horizontally arranged, the lower web plate (1002) is vertically arranged. The lower flange plate (1001) and the lower web plate (1002) are of equal length. The lower web plate (1002) is welded to the top of the lower flange plate (1001) in the middle and fixed by groove welding.

7. The space grid truss structure according to claim 6, characterized in that: The lower T-beam (11) includes a lower horizontal steel plate (1101) and a lower vertical steel plate (1102). The lower horizontal steel plate (1101) is horizontally arranged, the lower vertical steel plate (1102) is vertically arranged. The lower horizontal steel plate (1101) and the lower vertical steel plate (1102) are of equal length. The lower vertical steel plate (1102) is welded to the top of the lower horizontal steel plate (1101) in the middle and fixed by groove welding.

8. The space grid truss structure according to claim 7, wherein: The column (5) is provided with equally long slots (501) centered on the four perimeters of the upper pipe orifice and the four perimeters of the lower pipe orifice respectively. The length of the slots (501) is equal to the widths of the upper web plate (802), the upper vertical steel plate (902), the lower web plate (1002) and the lower vertical steel plate (1102). The upper web plate (802) and the upper vertical steel plate (902) which are welded and fixed in a cross-shaped structure are respectively inserted downward along the slots (501) located at the upper pipe orifice until the upper flange plate (801) and the upper horizontal steel plate (901) which are welded and fixed in a cross-shaped structure abut against the upper pipe orifice of the column (5), and either the upper web plate (802) or the upper vertical steel plate (902) abuts against the upper partition plate (6). A gasket is provided and the upper cross (3) is fixed by groove welding. The lower web plate (1002) and the lower vertical steel plate (1102) which are welded and fixed in a cross-shaped structure are respectively inserted upward along the slots (501) located at the lower pipe orifice until the lower flange plate (1001) and the lower horizontal steel plate (1101) which are welded and fixed in a cross-shaped structure abut against the lower pipe orifice of the column (5), and either the lower web plate (1002) or the lower vertical steel plate (1102) abuts against the lower partition plate (7). A gasket is provided and the lower cross (4) is fixed by groove welding.

9. A construction method of a space grid truss structure, realized by using the space grid truss structure as described in claim 8, characterized in that: It includes the following steps: Step 1: Assemble the abdominal column mechanism (2). The upper partition plate (6) and the lower partition plate (7) are respectively placed at equidistant positions at the upper and lower ends inside the column (5), and a gasket is provided and fixed by groove welding. Step 2: Equally long slots (501) are respectively centered and opened on the four perimeters of the upper pipe orifice and the lower pipe orifice of the column (5), and the length of the slots (501) is equal to the height of the upper partition plate (6) or the lower partition plate (7) from the upper pipe orifice or the lower pipe orifice. Step 3: Assemble the upper cross (3). First, assemble the upper chord beam (8), and fix the upper web plate (802) centered at the bottom of the upper flange plate (801) in the form of groove welding. Then, assemble the upper T-beam (9), and fix the upper vertical steel plate (902) centered at the bottom of the upper horizontal steel plate (901) in the form of groove welding. Finally, fix the upper chord beam (8) and the upper T-beam (9) in a cross-shaped structure perpendicular to each other in the form of full penetration welding. Step 4: Assemble the lower cross (4). First, assemble the lower chord beam (10), and fix the lower web plate (1002) centered at the top of the lower flange plate (1001) in the form of groove welding. Then, assemble the lower T-beam (11), and fix the lower vertical steel plate (1102) centered at the top of the lower horizontal steel plate (1101) in the form of groove welding. Finally, fix the lower chord beam (10) and the lower T-beam (11) in a cross-shaped structure perpendicular to each other in the form of full penetration welding. Step 5: Align and insert the upper cross (3) into the slot (501) at the upper pipe opening of the column (5), and use groove welding with a gasket to sequentially fix the upper chord beam (8) and the upper T-beam (9) to the top of the column (5); Step 6: Align and insert the lower cross (4) into the slot (501) at the lower pipe opening of the column (5), and use groove welding with a gasket to sequentially fix the lower chord beam (10) and the lower T-beam (11) to the bottom of the column (5); Step 7: Assemble and weld the multiple assembled steel trusses (1) longitudinally or transversely until a steel truss unit with a space grid structure is expanded and formed.

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