Construction method of densely-spliced modular steel-concrete building

Abstract

The application discloses a densely-spliced modular steel-concrete building, which comprises a plurality of steel-concrete building units; the steel-concrete building unit comprises a steel column, a top beam, a bottom beam and a connecting plate, the top beam and the bottom beam are connected to the top and the bottom of the steel column respectively to form a rectangular box type structure, the connecting plate is welded to the bottom surface of the bottom beam, and the upper edge of the connecting plate is welded to the bottom beam; the plurality of steel-concrete building units are stacked one on another, the lower edge of the connecting plate of the upper steel-concrete building unit falls on the top beam of the lower steel-concrete building unit and is welded to the top beam; in the application, the bottom beam of the upper steel-concrete building unit and the top beam of the lower steel-concrete building unit are connected through the connecting plate to form a new single laminated beam, the integrity of the whole steel-concrete building is improved, and the load bearing capacity of the building is stronger; meanwhile, the gap between the steel-concrete building units is smaller, a densely-spliced building effect is formed, and the building space can be expanded, and the subsequent waterproof construction and decoration construction are facilitated.

Description

Technical Field

[0001] This invention relates to the field of construction, and more particularly to a close-fitting modular steel-concrete building and its construction method. Background Technology

[0002] Modular reinforced concrete buildings mainly consist of multiple modular reinforced concrete building units, each of which is rectangular in shape and prefabricated in a factory. During construction, workers transport the prefabricated modular reinforced concrete building units to the construction site for assembly. The amount of work on-site is significantly less than in traditional building construction, which can greatly shorten the construction period and reduce construction costs.

[0003] Currently, various modular reinforced concrete building units are mainly assembled and connected using various fasteners. This assembly method has advantages such as being detachable and having no open flame (welding) on ​​site, but it also has some drawbacks. For example, relatively large gaps need to be left between each modular reinforced concrete building unit to install various fasteners and connecting steel parts; these large gaps not only occupy building space, but also affect subsequent decoration. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that in the prior art, modular steel-concrete building units are connected by fasteners, and large gaps need to be reserved between the modular steel-concrete building units, which not only occupies building space, but also affects subsequent decoration.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a close-fitting modular steel-concrete building, comprising multiple steel-concrete building units;

[0006] The reinforced concrete building unit includes steel columns, top beams, bottom beams, and connecting plates. The top beams and bottom beams are connected to the top and bottom of the steel columns to form a rectangular box structure. The top beams and bottom beams are generally made of I-beams. The outer layer of the web of the I-beam of the bottom beam is poured with concrete, and the inner side of the web of the I-beam of the bottom beam is poured with concrete together with the floor slab. The steel columns are generally made of steel square tubes, and stiffening plates should be installed inside the steel columns. The stiffening plates should be installed at the same level as the top beams and bottom beams.

[0007] The connecting plate is welded to the bottom surface of the bottom beam, and the upper edge of the connecting plate is welded to the bottom beam. The connecting plate uses the same material and thickness as the web of the bottom beam I-beam. The height of the connecting plate is usually 100-150mm, the length of the connecting plate is consistent with the length of the bottom beam, and the connecting plate and the web of the bottom beam are on the same plane. The welding method should preferably be bevel penetration welding.

[0008] The multiple steel-concrete building units are stacked one on top of the other, and the lower edge of the connecting plate of the upper steel-concrete building unit rests on the top beam of the lower steel-concrete building unit and is welded to it.

[0009] The steel columns of the upper-level reinforced concrete building unit are aligned with and welded to the steel columns of the lower-level reinforced concrete building unit.

[0010] In this invention, the bottom beam of the upper-level reinforced concrete building unit and the top beam of the lower-level reinforced concrete building unit are connected by a connecting plate to form a new single composite beam. Although this welding method is relatively more complicated to operate, it improves the overall integrity of the reinforced concrete building and makes the building more load-bearing. At the same time, the gaps between the various reinforced concrete building units are smaller, forming a close-fitting building effect, which is beneficial for expanding the building space and subsequent waterproofing and decoration construction.

[0011] It should be noted that in this invention, the connecting plate should be pre-welded to the bottom surface of the bottom beam, and not pre-welded to the upper surface of the top beam; otherwise, on the construction site, workers would need to weld the connecting plate to the bottom beam above on site, which would result in workers being in an overhead welding position, making it difficult to operate.

[0012] Furthermore, the multiple reinforced concrete building units are spliced ​​together in the horizontal direction, and the steel columns of adjacent reinforced concrete building units are welded together to form a first weld, and adjacent reinforced concrete building units are welded together at the beam-column joint to form an L-shaped second weld.

[0013] Furthermore, multiple intercolumn gussets are installed between the steel columns of adjacent reinforced concrete building units. The intercolumn gussets are welded to the adjacent steel columns and are distributed at intervals along the length of the steel columns.

[0014] Furthermore, the first weld is located at the connection node between the upper and lower reinforced concrete building units and extends upward beyond the bottom beam of the upper reinforced concrete building unit by a distance of A, and also extends downward beyond the top beam of the lower reinforced concrete building unit by a distance of B. The values ​​of A and B are not less than C, where C is the larger of one-sixth of the floor height of the reinforced concrete building unit and 500mm.

[0015] The length of each side of the second weld in the L-shape is not less than D, where D is the larger of the height of the composite beam and 500 mm. The height of the composite beam refers to the distance between the upper surface of the bottom beam of the upper steel-concrete building unit and the lower surface of the top beam of the lower steel-concrete building unit.

[0016] Furthermore, the intercolumn gusset plates are arranged in areas without the first weld, and the thickness of the intercolumn gusset plates is 5-8mm, the width is 50-100mm, and the spacing is 400-600mm.

[0017] Furthermore, the reinforced concrete building unit also includes beam end reinforcing haunches, which are welded to the ends of the two top beams at the corner joints of the top beams, and to the ends of the two bottom beams at the corner joints of the bottom beams.

[0018] This invention also provides a construction method for a close-fitting modular steel-concrete building, comprising the following steps:

[0019] Step 1: At the processing plant, the top beam and bottom beam are connected to the top and bottom of the steel column respectively to form a rectangular box structure;

[0020] Step 2: Weld the connecting plate to the bottom surface of the bottom beam, and weld the upper edge of the connecting plate to the bottom beam to complete the prefabrication of the steel-concrete building unit;

[0021] Step 3: Transport the reinforced concrete building units to the construction site;

[0022] Step 4: Neatly install the lower-level reinforced concrete building units;

[0023] Step 5: Hoist the upper-level reinforced concrete building unit to align it with the lower-level reinforced concrete building unit;

[0024] Step 6: Weld the lower edge of the connecting plate of the upper reinforced concrete building unit to the top beam of the lower reinforced concrete building unit;

[0025] Step 7: Weld the first weld, the second weld, and the intercolumnar gusset plate of the adjacent steel-concrete building units on the left and right sides.

[0026] In the aforementioned construction method, the reinforced concrete building units are prefabricated in a factory and then transported to the construction site for storage and installation. Because the connecting plate protrudes downwards beyond the column base of the steel column, the connecting plate of the reinforced concrete building unit in this invention rests directly on the ground to bear its own weight during storage. At this time, the connecting plate is only welded to the lower surface of the bottom beam on one side, resulting in poor stability of the entire connecting plate. During transportation and storage, the connecting plate, especially the two corners of its lower edge, is easily deformed due to load and transportation collisions. To overcome this defect, this invention provides a special column support to support the reinforced concrete building unit of this invention.

[0027] In step 1, after completing the rectangular box structure, a special column bracket is installed at the base of each steel column.

[0028] The column support includes a support plate, a vertical plate, a counter-bracing plate, and bolts. The support plate is arrow-shaped, including wing portions and shaft portions, with a trapezoidal groove between the wing portions and the shaft portion, and a locking hole in the shaft portion. The counter-bracing plate is C-shaped, with a locking shaft on its bottom surface, and the counter-bracing plate is fixed in the locking hole by the locking shaft. The two wings of the counter-bracing plate form rectangular positioning grooves between themselves and the two wing portions. The upper surface of the counter-bracing plate is provided with a counter-bracing member with a threaded hole, and the bolt is located in the threaded hole of the counter-bracing member. The vertical plate is fixed to the edge of the wing portion.

[0029] There are two types of column supports: one type has a vertical plate installed on both arrow wings; the other type has a vertical plate installed on only one arrow wing, and the position of the counter-bracing member is opposite to the position of the vertical plate. The first type of column support is used for steel columns at the edge position, and the second type of column support is used for steel columns in the middle position.

[0030] The column support is installed as follows: the bottom surface of the steel column rests on the support plate, the steel column is located between the upright plate and the counter-bracing member, and after the bolts are tightened, the steel column is squeezed, so that the entire column support is fixed at the column foot of the steel column.

[0031] When welding the connecting plate in step 2, both ends of the connecting plate are inserted into the rectangular positioning grooves of the column support.

[0032] The column support of the present invention has two functions: 1. During transportation and storage, the column support replaces the connecting plate to bear the self-weight of the reinforced concrete building unit, and the connecting plate no longer contacts the ground; 2. When welding the connecting plate, the column support is used as a temporary positioning and fixing device for the connecting plate. Workers only need to insert the connecting plate into the rectangular positioning groove of the column support for welding, which is convenient.

[0033] Furthermore, the middle part of the upright plate is welded to the edge of the arrow wing part, the upper part of the upright plate is vertical, and the lower part of the upright plate is bent outward.

[0034] In step 5, when hoisting the upper-level reinforced concrete building unit, the bent upright plate is used to guide the steel columns of the upper-level reinforced concrete building unit to align with the steel columns of the lower-level reinforced concrete building unit. After the upper-level reinforced concrete building unit is neatly placed on the lower-level reinforced concrete building unit, the bolts and counter-bracing plates are removed. Then, the upper-level reinforced concrete building unit is gently lifted using a hoisting tool, and finally the support plate is removed.

[0035] Beneficial effects: (1) The close-fitting modular steel-concrete building of the present invention uses connecting plates to combine the bottom beam of the upper steel-concrete building unit and the top beam of the lower steel-concrete building unit into a new single composite beam, which improves the integrity of the entire steel-concrete building and makes the building more load-bearing. (2) The close-fitting modular steel-concrete building of the present invention does not require various fasteners and connecting steel parts, and the gaps between steel-concrete building units are smaller, forming a close-fitting building effect, which is conducive to expanding the building space and subsequent waterproofing and decoration construction. (3) The close-fitting modular steel-concrete building of the present invention uses special column supports to support the self-weight of the steel-concrete building unit, preventing the connecting plates from deforming during transportation and storage; at the same time, the positioning groove in the column support can also help fix the connecting plate, which is conducive to the welding operation of the connecting plate. (4) The close-fitting modular steel-concrete building of the present invention designs the upright plate of the column support into a bent shape, so that the column support also has the effect of guiding the steel-concrete building unit to align up and down when hoisting. Attached Figure Description

[0036] Figure 1 This is a perspective view of the close-fitting modular steel-concrete building of Example 1.

[0037] Figure 2 This is a perspective view of the modular steel-concrete building unit in Example 1.

[0038] Figure 3 yes Figure 2 Enlarged view of A.

[0039] Figure 4 This is a perspective view of the column support in Example 2.

[0040] Figure 5 yes Figure 4 Another perspective.

[0041] Figure 6 This is an exploded view of the column support in Example 2.

[0042] Figure 7 yes Figure 6 Another perspective.

[0043] Figure 8 This is a schematic diagram of the installation of the column support in Example 2.

[0044] Figure 9 This is an application diagram of the column support in Example 2.

[0045] Figure 10 This is a three-dimensional view of the second type of column support in Example 2.

[0046] Figure 11 This is a schematic diagram of the installation of the second type of column support in Example 2.

[0047] Among them: 100, reinforced concrete building unit; 110, steel column; 120, top beam; 130, bottom beam; 140, connecting plate; 150, inter-column gusset plate; 160, beam end reinforcing haunch plate; 200, first weld; 300, second weld; 400, column support; 410, support plate; 411, arrow wing part; 412, arrow shaft part; 413, locking hole; 420, upright plate; 430, counter-bracing plate; 431, locking shaft; 432, counter-bracing component; 440, bolt; 450, positioning groove. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to specific embodiments.

[0049] Example 1

[0050] like Figures 1 to 3 As shown, the close-fitting modular steel-concrete building of this embodiment includes multiple steel-concrete building units 100.

[0051] The reinforced concrete building unit 100 includes steel columns 110, top beams 120, bottom beams 130, connecting plates 140, inter-column gusset plates 150, and beam end reinforcing haunches 160. The top beams 120 and bottom beams 130 are respectively connected to the top and bottom of the steel columns 110 to form a rectangular box structure. The top beams 120 and bottom beams 130 are made of I-beams. The outer layer of the web of the I-beam of the bottom beam 130 is poured with concrete, and the inner side of the web of the I-beam of the bottom beam 130 is poured with concrete together with the floor slab. The steel columns 110 are made of steel square tubes.

[0052] The connecting plate 140 is welded to the bottom surface of the bottom beam 130, and the upper edge of the connecting plate 140 is welded to the bottom beam 130. The connecting plate 140 uses the same material and thickness as the web of the I-beam of the bottom beam 130. The height of the connecting plate 140 is 100-150mm, and the length of the connecting plate 140 is consistent with the length of the bottom beam 130. The connecting plate 140 and the web of the bottom beam 130 are on the same plane. The welding method should preferably be bevel penetration welding.

[0053] Multiple reinforced concrete building units 100 are stacked one on top of the other. The lower edge of the connecting plate 140 of the upper reinforced concrete building unit 100 rests on the top beam 120 of the lower reinforced concrete building unit 100 and is welded to it.

[0054] The steel columns 110 of the upper reinforced concrete building unit 100 are aligned with the steel columns 110 of the lower reinforced concrete building unit 100 and welded to each other.

[0055] Multiple reinforced concrete building units 100 are spliced ​​together in the horizontal direction. The steel columns 110 of adjacent reinforced concrete building units 100 are welded together to form a first weld 200. Adjacent reinforced concrete building units 100 are welded together at the beam-column joint to form an L-shaped second weld 300.

[0056] The first weld 200 is located at the connection node between the upper and lower reinforced concrete building units 100 and extends upward beyond the bottom beam 130 of the upper reinforced concrete building unit 100 by a distance of A. It also extends downward beyond the top beam 120 of the lower reinforced concrete building unit 100 by a distance of B. The values ​​of A and B are not less than C, where C is the larger of one-sixth of the floor height of the reinforced concrete building unit 100 and 500 mm.

[0057] The length of each side of the second weld 300 of the L-shape is not less than D, where D is the larger of the height of the composite beam and 500 mm. The height of the composite beam refers to the distance between the upper surface of the bottom beam 130 of the upper steel-concrete building unit 100 and the lower surface of the top beam 120 of the lower steel-concrete building unit 100.

[0058] Multiple intercolumn gusset plates 150 are provided between the steel columns 110 of adjacent reinforced concrete building units 100. The intercolumn gusset plates 150 are welded to the adjacent steel columns 110 and are distributed at intervals along the length of the steel columns 110. The intercolumn gusset plates 150 are arranged in areas without the first weld 200. The thickness of the intercolumn gusset plates 150 is 5-8 mm, the width is 50-100 mm, and the spacing is 400-600 mm.

[0059] The beam end reinforcing haunch plate 160 is welded to the ends of the two top beams 120 at the corner of the top beam 120, and the beam end reinforcing haunch plate 160 is welded to the ends of the two bottom beams 130 at the corner of the bottom beam 130.

[0060] In this embodiment, the bottom beam 130 of the upper reinforced concrete building unit 100 and the top beam 120 of the lower reinforced concrete building unit 100 are connected by a connecting plate 140 to form a new single composite beam. Although this welding combination method is relatively troublesome to operate, it improves the overall integrity of the reinforced concrete building and makes the building more load-bearing. At the same time, the gaps between the various reinforced concrete building units 100 are smaller, forming a close-fitting building effect, which is beneficial to expanding the building space and subsequent waterproofing and decoration construction.

[0061] The construction method of the close-fitting modular steel-concrete building in this embodiment includes the following steps:

[0062] Step 1: At the processing plant, the top beam 120 and the bottom beam 130 are connected to the top and bottom of the steel column 110 respectively to form a rectangular box structure;

[0063] Step 2: Weld the connecting plate 140 to the bottom surface of the bottom beam 130, and weld the upper edge of the connecting plate 140 to the bottom beam 130 to complete the prefabrication of the steel-concrete building unit 100.

[0064] Step 3: Transport the reinforced concrete building unit 100 to the construction site;

[0065] Step 4: Neatly install the lower-level reinforced concrete building unit 100;

[0066] Step 5: Hoist the upper reinforced concrete building unit 100 so that the upper reinforced concrete building unit 100 is aligned with the lower reinforced concrete building unit 100;

[0067] Step 6: Weld the lower edge of the connecting plate 140 of the upper reinforced concrete building unit 100 to the top beam 120 of the lower reinforced concrete building unit 100.

[0068] Step 7: Weld the first weld 200, the second weld 300, and the intercolumn gusset plate 150 of the left and right adjacent steel-concrete building units 100.

[0069] Example 2

[0070] In the construction method of Embodiment 1, the reinforced concrete building unit 100 is prefabricated in the factory and then needs to be transported to the construction site for storage and installation. Since the connecting plate 140 protrudes downwards beyond the column base of the steel column 110, when the reinforced concrete building unit 100 of Embodiment 1 is stored, the connecting plate 140 directly rests on the ground to bear the weight of the reinforced concrete building unit 100. At this time, the connecting plate 140 is only welded to the lower surface of the bottom beam 130 on one side, resulting in poor stability of the entire connecting plate 140. During transportation and storage, the connecting plate 140, especially the two corners of its lower edge, is easily deformed due to load and transportation collisions. To overcome this defect, this embodiment provides... Figures 4 to 11 The special column support 400 shown is used to support the reinforced concrete building unit 100.

[0071] like Figures 4 to 7 As shown, the column support 400 includes a support plate 410, a vertical plate 420, a counter-bracing plate 430, and bolts 440. The support plate 410 is arrow-shaped, including an arrow wing portion 411 and an arrow shaft portion 412. A trapezoidal groove is provided between the arrow wing portion 411 and the arrow shaft portion 412. The arrow shaft portion 412 is provided with a locking hole 413. The counter-bracing plate 430 is C-shaped, and a locking shaft 431 is provided on the bottom surface of the counter-bracing plate 430. The counter-bracing plate 430 is fixed in the locking hole 413 by the locking shaft 431. The two wings of the 0 form rectangular positioning grooves 450 between the two arrow wing parts 411 respectively; the upper surface of the counter-support plate 430 is provided with a counter-support member 432 with a threaded hole, and the bolt 440 is located in the threaded hole of the counter-support member 432. In this embodiment, a nut is directly used as the counter-support member 432; the upright plate 420 is fixed to the edge of the arrow wing part 411, the middle part of the upright plate 420 is welded to the edge of the arrow wing part 411, the upper part of the upright plate 420 is vertical, and the lower part of the upright plate 420 is bent outward.

[0072] The installation method of the column support 400 in this embodiment is as follows: Figure 8 As shown, the bottom surface of the steel column 110 rests on the support plate 410. The steel column 110 is located between the upright plate 420 and the counter-bracing member 432. After the bolt 440 is tightened, it presses the steel column 110, so that the entire column support 400 is fixed at the column foot of the steel column 110.

[0073] The column support 400 in this embodiment has three functions:

[0074] Function 1: During the transportation and storage of the reinforced concrete building unit 100, the column support 400 replaces the connecting plate 140 to bear the weight of the reinforced concrete building unit 100, and the connecting plate 140 no longer contacts the ground, effectively protecting the connecting plate 140.

[0075] Function 2: such as Figure 9As shown, when welding the connecting plate 140 in the processing plant, the entire rectangular box is first flipped over so that the column base of the steel column 110 faces upward. Then, the two ends of the connecting plate 140 are inserted into the rectangular positioning groove 450 of the column support 400 to achieve the positioning and temporary fixation of the connecting plate 140. After that, the workers can weld the connecting plate 140. Figure 9 The connecting plate 140 on the left side has been fixed, while the connecting plate 140 on the right side has not yet been placed.

[0076] Function 3: When hoisting the upper-level reinforced concrete building unit 100 at the construction site, the bent upright plate 420 can be used to guide the steel columns 110 of the upper-level reinforced concrete building unit 100 to align with the steel columns 110 of the lower-level reinforced concrete building unit 100; after the upper-level reinforced concrete building unit 100 is neatly placed on the lower-level reinforced concrete building unit 100, the bolts 440 and the counter-bracing plate 430 are removed, and then the upper-level reinforced concrete building unit 100 is gently lifted using a lifting device, and finally the support plate 410 is pulled out.

[0077] This embodiment Figures 4 to 9 The column support 400 shown has two uprights 420. This is a type of column support that can be used for steel columns 110 at edge positions. Figure 10 and Figure 11 The image shows a type II column support. The type II column support has only one arrow wing 411 for mounting the upright plate 420, and the position of the counter-bracing member 432 is opposite to the position of the upright plate 420. The type II column support 400 is used for the steel column 110 in the middle position.

[0078] Although embodiments of the present invention have been described in the specification, these embodiments are merely illustrative and should not be construed as limiting the scope of protection of the present invention. Various omissions, substitutions, and modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A construction method for a close-fitting modular steel-concrete building, characterized in that... : The densely packed modular steel-concrete building comprises multiple steel-concrete building units; The reinforced concrete building unit includes steel columns, top beams, bottom beams, and connecting plates. The top beams and bottom beams are respectively connected to the top and bottom of the steel columns to form a rectangular box structure. The connecting plates are welded to the bottom surface of the bottom beams, and the upper edge of the connecting plates is welded to the bottom beams. The multiple steel-concrete building units are stacked one on top of the other, and the lower edge of the connecting plate of the upper steel-concrete building unit rests on the top beam of the lower steel-concrete building unit and is welded to it. The steel columns of the upper-level reinforced concrete building unit are aligned with the steel columns of the lower-level reinforced concrete building unit and welded together. The multiple steel-concrete building units are spliced ​​together in the horizontal direction. The steel columns of adjacent steel-concrete building units are welded together to form a first weld, and adjacent steel-concrete building units are welded together at the beam-column joint to form an L-shaped second weld. Multiple inter-column gussets are installed between the steel columns of adjacent reinforced concrete building units. The inter-column gussets are welded to the adjacent steel columns and are distributed at intervals along the length of the steel columns. The construction method of the densely packed modular steel-concrete building includes the following steps: Step 1: At the processing plant, the top beam and bottom beam are connected to the top and bottom of the steel column respectively to form a rectangular box structure; Step 2: Weld the connecting plate to the bottom surface of the bottom beam, and weld the upper edge of the connecting plate to the bottom beam to complete the prefabrication of the steel-concrete building unit; Step 3: Transport the reinforced concrete building units to the construction site; Step 4: Neatly install the lower-level reinforced concrete building units; Step 5: Hoist the upper-level reinforced concrete building unit to align it with the lower-level reinforced concrete building unit; Step 6: Weld the lower edge of the connecting plate of the upper reinforced concrete building unit to the top beam of the lower reinforced concrete building unit; Step 7: Weld the first weld, the second weld, and the intercolumnar gusset plate of the adjacent steel-concrete building units on the left and right sides; In step 1, after completing the rectangular box structure, a special column bracket is installed at the base of each steel column. The column support includes a support plate, a vertical plate, a counter-bracing plate, and bolts. The support plate is arrow-shaped, including wing portions and shaft portions, with a trapezoidal groove between the wing portions and the shaft portion, and a locking hole in the shaft portion. The counter-bracing plate is C-shaped, with a locking shaft on its bottom surface, and the counter-bracing plate is fixed in the locking hole by the locking shaft. The two wings of the counter-bracing plate form rectangular positioning grooves between themselves and the two wing portions. The upper surface of the counter-bracing plate is provided with a counter-bracing member with a threaded hole, and the bolt is located in the threaded hole of the counter-bracing member. The vertical plate is fixed to the edge of the wing portion. There are two types of column supports: one type has upright plates installed on both arrow wings; the other type has an upright plate installed on only one arrow wing, and the position of the counter-bracing member is opposite to the position of the upright plate. The column support is installed as follows: the bottom surface of the steel column rests on the support plate, the steel column is located between the upright plate and the counter-bracing member, and after the bolts are tightened, the steel column is squeezed, so that the entire column support is fixed at the column foot of the steel column. When welding the connecting plate in step 2, both ends of the connecting plate are inserted into the rectangular positioning grooves of the column support.

2. The construction method of the close-fitting modular steel-concrete building according to claim 1, characterized in that: The first weld is located at the connection node between the upper and lower reinforced concrete building units and extends upward beyond the bottom beam of the upper reinforced concrete building unit by a distance of A. It also extends downward beyond the top beam of the lower reinforced concrete building unit by a distance of B. The values ​​of A and B are not less than C, where C is the larger of one-sixth of the floor height of the reinforced concrete building unit and 500mm. The length of each side of the second weld in the L-shape is not less than D, where D is the larger of the height of the composite beam and 500 mm. The height of the composite beam refers to the distance between the upper surface of the bottom beam of the upper steel-concrete building unit and the lower surface of the top beam of the lower steel-concrete building unit.

3. The construction method of the close-fitting modular steel-concrete building according to claim 1, characterized in that: The intercolumn gusset plates are arranged in areas without the first weld. The thickness of the intercolumn gusset plates is 5-8mm, the width is 50-100mm, and the spacing is 400-600mm.

4. The construction method of the close-fitting modular steel-concrete building according to claim 1, characterized in that: The reinforced concrete building unit also includes beam end reinforcing haunches, which are welded to the ends of the two top beams at the corner joints of the top beams and to the ends of the two bottom beams at the corner joints of the bottom beams.

5. The construction method of the close-fitting modular steel-concrete building according to claim 1, characterized in that: The middle part of the upright plate is welded to the edge of the arrow wing part, the upper part of the upright plate is vertical, and the lower part of the upright plate is bent outward. In step 5, when hoisting the upper-level reinforced concrete building unit, the bent upright plate is used to guide the steel columns of the upper-level reinforced concrete building unit to align with the steel columns of the lower-level reinforced concrete building unit. After the upper-level reinforced concrete building unit is neatly placed on the lower-level reinforced concrete building unit, the bolts and counter-bracing plates are removed. Then, the upper-level reinforced concrete building unit is gently lifted using a hoisting tool, and finally the support plate is removed.

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