A modular combined steel-concrete building unit, its production method and installation method

Abstract

The present invention discloses a modular combined steel-concrete building unit, which includes steel columns, top beams, bottom beams and L-shaped steel members; the top beam and the bottom beam are respectively connected to the top and bottom of the steel column to form a rectangular box structure; the L-shaped steel members are fixed on the steel columns and are located on the first outer facade and the second outer facade of the modular combined steel-concrete building unit. The first outer facade and the second outer facade are two opposite facades of the modular combined steel-concrete building unit. The L-shaped steel members on the first outer facade and the L-shaped steel members on the second outer facade are inverted with respect to each other. Through holes for installing bolts are provided on the L-shaped steel members. When two adjacent modular combined steel-concrete building units are installed, the L-shaped steel members of the left modular combined steel-concrete building unit and the inverted L-shaped steel members of the right modular combined steel-concrete building unit are engaged with each other; so that the steel columns of adjacent modular combined steel-concrete building units are connected together, improving the load-bearing capacity of the entire building.

Description

Technical Field

[0001] The present invention relates to the field of construction, and particularly to a modular combined steel-concrete building unit, a production method thereof, and an installation method thereof. Background Art

[0002] Modular combined steel-concrete building units are an important part of new prefabricated buildings. Modular combined steel-concrete building units can efficiently complete various building main bodies and building accessories such as unit structures, decorations, water and electricity, equipment pipelines, and bathroom facilities in the factory. At the construction site, only the building units need to be combined to complete the whole building, which can greatly shorten the construction period and reduce the construction cost.

[0003] Currently, when modular combined steel-concrete building units are assembled on site, the connection between vertical boxes is mainly emphasized, and the horizontal boxes are only connected at the frame nodes, resulting in limited force transmission between horizontal boxes, restricting the development of prefabricated buildings. This is also one of the reasons why most current prefabricated buildings are low-rise buildings. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that in existing prefabricated buildings, the connection method between horizontal boxes is relatively single, restricting the development of prefabricated modular buildings towards high-rise buildings.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: a modular combined steel-concrete building unit, including steel columns, top beams, bottom beams, and L-shaped steel members;

[0006] The top beam and the bottom beam are respectively connected to the top and bottom of the steel column to form a rectangular box structure;

[0007] The L-shaped steel members are fixed on the steel column and are located on the first outer facade and the second outer facade of the modular combined steel-concrete building unit. The first outer facade and the second outer facade are two opposite facades of the modular combined steel-concrete building unit. The L-shaped steel members on the first outer facade and the L-shaped steel members on the second outer facade are inverted with respect to each other, that is, one L-shaped steel member is in the shape of "L", and the other L-shaped steel member is in the shape of "7";

[0008] Through holes for installing bolts are provided on the L-shaped steel members, generally two through holes are provided, and the center distance between the two through holes is not less than 2.5 times the bolt diameter; when two adjacent modular combined steel-concrete building units are installed, the L-shaped steel members of the left modular combined steel-concrete building unit and the inverted L-shaped steel members of the right modular combined steel-concrete building unit are engaged with each other; then, the engaged L-shaped steel members are fixed with bolts, so that the steel columns of adjacent modular combined steel-concrete building units are connected together, approximately forming a whole column to bear the load, improving the load-bearing capacity of the entire building.

[0009] Specifically, the steel column is a square steel tube, and stiffening plates are built-in at the top and bottom of the square steel tube; both the top beam and the bottom beam are I-beams.

[0010] Furthermore, a floor slab is arranged between the bottom beams, and a wall is arranged on the floor slab; a plurality of steel sheets for carrying the splicing formwork are arranged on the lower flange of the bottom beam.

[0011] Furthermore, C-shaped steel bars or stud bolts are arranged on the outer side of the web of the bottom beam, and both the C-shaped steel bars and the stud bolts are used for pouring the double-beam joint between two bottom beams during the subsequent installation of the modular composite steel-concrete building unit.

[0012] The present invention also provides a production method of a modular composite steel-concrete building unit, including the following steps:

[0013] Production step 1: Cut square steel tubes to be used as steel columns, cut I-beams to be used as top beams and bottom beams, and cut angle steels and drill holes to process them into L-shaped steel parts.

[0014] Production step 2: Build and weld stiffening plates at the top and bottom of the steel columns, weld steel sheets on the lower flange of the bottom beam, and weld C-shaped steel bars or stud bolts on the outer side of the web of the bottom beam.

[0015] Production step 3: Weld L-shaped steel parts on the steel columns.

[0016] Production step 4: Weld the steel columns, top beams and bottom beams to form a rectangular box structure.

[0017] Production step 5: Arrange floor slab steel bars and pour the floor slab, and continue to install walls, doors and windows or other building accessories on the floor slab according to design requirements.

[0018] In the present invention, when the modular composite steel-concrete building unit is installed at the construction site, the L-shaped steel parts on adjacent modular composite steel-concrete building units must be engaged with each other. Therefore, it is very important to accurately control the welding position of the L-shaped steel parts in production step 3. If the conventional method is used to individually position and weld each L-shaped steel part, it will be very time-consuming and prone to position errors; in order to improve the welding efficiency of the L-shaped steel parts, the present invention uses a special tool to assist in welding the L-shaped steel parts in production step 3; the special tool includes a frame flat plate, a bearing flat plate, guide columns and springs. Two parallel vertical plates are arranged on the bottom surface of the frame flat plate, and a slot matching the steel column is formed between the two vertical plates; a vertical guide cylinder is arranged on the bottom surface of the frame flat plate. The guide columns pass through the frame flat plate and the guide cylinder from top to bottom. The springs are sleeved on the guide columns and are located inside the guide cylinder. A convex ring is arranged on the guide column, and the convex ring presses on the spring. The number of guide columns is two, and a handle is arranged between the two guide columns; the bottom of the guide column is connected to a horizontal bearing flat plate, and two positioning columns are arranged on the bearing flat plate.

[0019] The specific steps of the production step 3 are as follows:

[0020] Production step 3.1: Place two steel columns parallel and horizontally on the working plane;

[0021] Production step 3.2: Place the frame flat plate of the special tool on the steel column, and insert the slot under the frame flat plate into one of the steel columns; the bearing flat plate is located between the two steel columns;

[0022] Production step 3.3: Sleeve the through holes of the two L-shaped steel pieces on the positioning columns of the bearing flat plate;

[0023] Production step 3.4: Spot-weld the two L-shaped steel pieces to the two steel columns respectively;

[0024] Production step 3.5: Press down the handle so that the two guide columns and the bearing flat plate move downward, and the positioning columns drop below the L-shaped steel pieces; then translate the entire special tool along the steel column to the next position, continue to place new L-shaped steel pieces on the positioning columns and spot-weld; repeat this step continuously until all L-shaped steel pieces are spot-welded;

[0025] Production step 3.6: Separate the two steel columns and full-weld all the L-shaped steel pieces;

[0026] Production step 3.7: Number the welded steel columns to ensure that the two completed steel columns are used in two adjacent modular composite steel-concrete building units.

[0027] In the above welding method, the two L-shaped steel pieces are placed in a biting posture in advance and then welded, which can ensure that when the adjacent modular composite steel-concrete building units are installed later, the adjacent L-shaped steel pieces can definitely be aligned and bite with each other.

[0028] Furthermore, one of the two vertical plates is provided with a bending part. After the slot between the two vertical plates is inserted into the steel column, a wedge-shaped area is formed between the bending part and the steel column; a wedge-shaped plate is provided on the bearing flat plate. When the bearing flat plate is at the highest position under the action of the spring, the wedge-shaped plate is inserted into the wedge-shaped area. After the wedge-shaped plate is inserted into the wedge-shaped area, the special tool can be locked at the current position of the steel column to prevent the special tool from displacing along the steel column under the action of external force; when the L-shaped steel piece is welded, when the worker presses down the handle and withdraws the guide column, the wedge-shaped plate will also move downward synchronously with the bearing flat plate, releasing the locking effect on the special tool, and the worker can normally translate the special tool to weld the next L-shaped steel piece.

[0029] The present invention also provides an installation method for a modular composite steel-concrete building unit, including the following steps:

[0030] Installation Step 1: Lift the modular composite steel-concrete building unit to the side of the already installed modular composite steel-concrete building unit, and translate the modular composite steel-concrete building unit so that the inverted L-shaped steel pieces on its steel columns fall on the L-shaped steel pieces of the adjacent modular composite steel-concrete building unit; then finely adjust the modular composite steel-concrete building unit to the appropriate position;

[0031] Installation Step 2: Install bolts and nuts in the through holes of the L-shaped steel pieces for fixation;

[0032] Installation Step 3: If C-shaped steel bars are provided on the outer side of the web of the bottom beam, insert erection bars at the double-beam joint between the bottom beams of two adjacent modular composite steel-concrete building units, and tie the erection bars with C-shaped steel pieces to form a steel reinforcement cage; if stud bolts are provided on the outer side of the web of the bottom beam, place a prefabricated steel reinforcement cage at the joint between the bottom beams of two adjacent modular composite steel-concrete building units;

[0033] Installation Step 4: Place the bottom formwork on the steel sheet at the double-beam joint, set end formworks at both ends of the double-beam joint, and then pour concrete at the double-beam joint.

[0034] Beneficial Effects: (1) The modular composite steel-concrete building unit of the present invention is provided with L-shaped steel pieces placed in opposite directions on the opposite steel columns. When adjacent modular composite steel-concrete building units are installed, they can be connected to each other by means of the L-shaped steel pieces, so that the steel columns of adjacent modular composite steel-concrete building units are connected together, approximately forming a whole column to bear the load, thereby improving the load-bearing capacity of the entire building. (2) The modular composite steel-concrete building unit of the present invention is provided with a steel reinforcement cage at the double-beam joint and concrete is poured, so that the force of the entire floor slab of the modular building is continuous, effectively reducing the lateral displacement of the modular building under the action of horizontal forces such as wind and earthquake, and improving the comfort of the occupants. (3) When the modular composite steel-concrete building unit of the present invention is produced, two L-shaped steel pieces are placed in a biting posture in advance by using a special tool and then welded, which can ensure that the adjacent L-shaped steel pieces can definitely be aligned and bite each other during the subsequent installation of the modular composite steel-concrete building unit. (4) The modular composite steel-concrete building unit of the present invention is provided with a wedge plate in the special tool, and the position of the special tool is locked and unlocked in cooperation with the action of the handle, ensuring that the L-shaped steel piece remains stable in position during welding. Description of the Drawings

[0035] Figure 1 is the three-dimensional view of the building unit of Embodiment 1.

[0036] Figure 2 is Figure 1 the enlarged view A of

[0037] Figure 3 is Figure 1 the enlarged view B of

[0038] Figure 4 is Figure 1 the enlarged view of C.

[0039] Figure 5 is the installation schematic diagram of the building unit in Embodiment 1.

[0040] Figure 6 is Figure 5 the enlarged view of D.

[0041] Figure 7 is the schematic diagram of the double-beam joint during the installation of the building unit in Embodiment 1 (one of them).

[0042] Figure 8 is the schematic diagram of the double-beam joint during the installation of the building unit in Embodiment 1 (the other one).

[0043] Figure 9 is the three-dimensional view of the special tool in Embodiment 1.

[0044] Figure 10 is the three-dimensional view of the special tool in Embodiment 1 (from another perspective).

[0045] Figure 11 is the front view of the special tool in Embodiment 1.

[0046] Figure 12 is Figure 11 the right view of.

[0047] Figure 13 is Figure 12 the A-A sectional view of.

[0048] Figure 14 is the application state diagram of the special tool in Embodiment 1.

[0049] Figure 15 is the application state diagram of the special tool in Embodiment 1 (hiding one steel column).

[0050] Figure 16 is Figure 15 the right view of.

[0051] Figure 17 is Figure 15 the state diagram after placing the L-shaped steel part.

[0052] Figure 18 is the working principle diagram of the special tool in Embodiment 1.

[0053] Wherein: 100, steel column; 110, stiffening plate; 200, top beam; 300, bottom beam; 310, steel sheet; 320, C-shaped steel bar; 330, stud; 340, bottom formwork; 400, L-shaped steel member; 500, floor slab; 600, wall; 700, bolt; 800, special tool; 810, frame flat plate; 811, vertical plate; 811-1, bending part; 812, guide cylinder; 820, bearing flat plate; 821, positioning column; 822, wedge plate; 830, guide post; 840, spring; 850, handle. Specific embodiments

[0054] The present invention will be further described in detail below in conjunction with specific embodiments.

[0055] As Figure 1 shown, the modular composite steel-concrete building unit of this embodiment includes a steel column 100, a top beam 200, a bottom beam 300, an L-shaped steel member 400, a floor slab 500 and a wall 600.

[0056] The number of steel columns 100 is four. The steel columns 100 are cut from steel square tubes. As Figure 2 and Figure 3 shown, stiffening plates 110 are built-in at the top and bottom of the steel column 100. Both the top beam 200 and the bottom beam 300 are I-beams. The top beam 200 and the bottom beam 300 are respectively connected to the top and bottom of the steel column 100 to form a rectangular box structure. A floor slab 500 is arranged between the bottom beams 300, and a wall 600 is arranged on the floor slab 500.

[0057] As Figures 1 to 3 shown, the L-shaped steel members 400 are fixed on the steel column 100 and are on the first outer facade and the second outer facade of the modular composite steel-concrete building unit. The first outer facade and the second outer facade are two opposite facades of the modular composite steel-concrete building unit. The L-shaped steel members 400 on the first outer facade and the L-shaped steel members 400 on the second outer facade are inverted with each other. That is, the posture of one L-shaped steel member 400 is in an "L" shape, and the posture of the other L-shaped steel member 400 is in a "7" shape. Through holes for installing bolts 700 are arranged on the L-shaped steel members 400. Generally, two through holes are arranged, and the center distance between the two through holes is not less than 2.5 times the diameter of the bolt 700. As Figure 5 and Figure 6 shown, when two adjacent modular composite steel-concrete building units are installed, the L-shaped steel members 400 of the left modular composite steel-concrete building unit are engaged with the inverted L-shaped steel members 400 of the right modular composite steel-concrete building unit; then the engaged L-shaped steel members 400 are fixed with bolts 700, so that the steel columns 100 of the adjacent modular composite steel-concrete building units are connected together, approximately forming a whole column to bear the load, improving the load-bearing capacity of the entire building.

[0058] AsFigure 4 As shown, a plurality of steel sheets 310 for carrying the joint formwork are arranged on the lower flange of the bottom beam 300. C-shaped steel bars 320 are arranged on the outer side of the web of the bottom beam 300. As Figure 7 shown, when two adjacent modular composite steel-concrete building units are installed in place, a double-beam joint will be formed between the bottom beams 300 of these two adjacent modular composite steel-concrete building units, and the C-shaped steel bars 320 will cross each other at the double-beam joint. Then, the workers insert erection bars into the C-shaped steel bars 320, and the erection bars and the C-shaped steel bars 320 are tied to form a reinforcement cage; then, a bottom formwork 340 is placed on the steel sheets 310 at the double-beam joint, and end formworks are arranged at both ends of the double-beam joint; finally, concrete is poured at the double-beam joint to complete the double-beam joint treatment, so that the floor slabs 500 of the left and right building units form a whole.

[0059] Figure 8 Shown is another treatment method for the double-beam joint: stud bolts 330 are arranged on the outer side of the web of the bottom beam 300. During the assembly process of the left and right modular composite steel-concrete building units, a prefabricated reinforcement cage is inserted between the two bottom beams 300 in advance; finally, the bottom formwork 340 and the end formwork are placed in the same way, and then concrete is poured to complete the double-beam joint treatment.

[0060] The production method of the modular composite steel-concrete building unit in this embodiment includes the following steps:

[0061] Production step 1: Cut steel squares for use as steel columns 100, cut I-beams for use as top beams 200 and bottom beams 300, and cut angle steels and drill holes to process them into L-shaped steel parts 400;

[0062] Production step 2: Internally weld stiffening plates 110 at the top and bottom of the steel column 100, weld steel sheets 310 on the lower flange of the bottom beam 300, and weld C-shaped steel bars 320 or stud bolts 330 on the outer side of the web of the bottom beam 300;

[0063] Production step 3: Weld L-shaped steel parts 400 on the steel column 100;

[0064] Production step 4: Weld the steel column 100, the top beam 200 and the bottom beam 300 to form a rectangular box structure;

[0065] Production step 5: Arrange the reinforcement bars of the floor slab 500 and pour the floor slab 500. According to the design requirements, continue to install walls 600, doors and windows or other building accessories on the floor slab 500.

[0066] In this embodiment, when modular combined steel-concrete building units are installed at the construction site, the L-shaped steel members 400 on adjacent modular combined steel-concrete building units must be engaged with each other. Therefore, it is very important to accurately control the welding positions of the L-shaped steel members 400 in production step 3. If the conventional method is used to individually position and weld each L-shaped steel member 400, it will be very time-consuming and prone to position errors. To improve the welding efficiency of the L-shaped steel members 400, a special tool 800 is used to assist in welding the L-shaped steel members 400 in the production step 3. As Figures 9 to 13 shown, the special tool 800 includes a frame flat plate 810, a bearing flat plate 820, guide columns 830 and springs 840. Two parallel vertical plates 811 are provided on the bottom surface of the frame flat plate 810, and a slot matching the steel column 100 is formed between the two vertical plates 811; a vertical guide cylinder 812 is provided on the bottom surface of the frame flat plate 810. The guide columns 830 pass through the frame flat plate 810 and the guide cylinder 812 from top to bottom. The springs 840 are sleeved on the guide columns 830 and are located within the guide cylinder 812. A convex ring is provided on the guide columns 830, and the convex ring presses on the springs 840. The number of guide columns 830 is two, and a handle 850 is provided between the two guide columns 830; the bottom of the guide columns 830 is connected to a horizontal bearing flat plate 820, and two positioning columns 821 are provided on the bearing flat plate 820.

[0067] As Figure 12 shown, a bent portion 811-1 is provided on one of the two vertical plates 811. As Figure 16 shown, when the slot between the two vertical plates 811 is inserted into the steel column 100 in an inserting manner, a wedge-shaped area is formed between the bent portion 811-1 and the steel column 100; a wedge-shaped plate 822 is provided on the bearing flat plate 820. When the bearing flat plate 820 is in the highest position under the action of the spring 840, the wedge-shaped plate 822 is inserted into the wedge-shaped area. After the wedge-shaped plate 822 is inserted into the wedge-shaped area, the special tool 800 can be locked at the current position of the steel column 100, avoiding displacement of the special tool 800 along the steel column 100 under the action of an external force; when the welding of the L-shaped steel member 400 is completed and the worker presses down the handle 850 to withdraw the guide columns 830, the wedge-shaped plate 822 will also move downward synchronously with the bearing flat plate 820, releasing the locking effect on the special tool 800, and the worker can normally translate the special tool 800 to weld the next L-shaped steel member 400.

[0068] In production step 3, the special tool 800 is used to weld the L-shaped steel members 400, which specifically includes the following steps:

[0069] Production step 3.1: As Figure 14 shown, two steel columns 100 are placed horizontally and parallel on the working plane;

[0070] Production step 3.2: As Figure 14 and15 As shown, place the frame flat plate 810 of the special tool 800 on the steel column 100, and insert the slot below the frame flat plate 810 into one of the steel columns 100 in an inserting manner; the bearing flat plate 820 is located between the two steel columns 100; at this time, the bearing flat plate 820 is in the highest position as shown in Figure 16 shown under the action of the spring 840, and the wedge plate 822 is inserted into the wedge-shaped area. After the wedge plate 822 is inserted into the wedge-shaped area, the special tool 800 can be locked at the current position of the steel column 100;

[0071] Production step 3.3: As shown in Figure 17 shown, sleeved the through holes of the two L-shaped steel parts 400 on the positioning posts 821 of the bearing flat plate 820, and the two L-shaped steel parts 400 are in a mutually engaging posture with opposite orientations;

[0072] Production step 3.4: Spot-weld the two L-shaped steel parts 400 to the two steel columns 100 respectively;

[0073] Production step 3.5: As shown in Figure 18 shown, press down the handle 850, so that the two guide posts 830 and the bearing flat plate 820 move downward, and the positioning posts 821 are lowered below the L-shaped steel parts 400; the wedge plate 822 will also move downward synchronously with the bearing flat plate 820 to release the locking effect on the special tool 800; then translate the entire special tool 800 to the right along the steel column 100 to the next position, continue to place new L-shaped steel parts 400 on the positioning posts 821 and perform spot welding; continuously repeat this step until all the L-shaped steel parts 400 are spot-welded;

[0074] Production step 3.6: Separate the two steel columns 100 and fully weld all the L-shaped steel parts 400;

[0075] Production step 3.7: Number the welded steel columns 100 to ensure that the two completed steel columns 100 are used on two adjacent modular combined steel-concrete building units.

[0076] The installation method of the modular combined steel-concrete building unit in this embodiment includes the following steps:

[0077] Installation step 1: Hoist the modular combined steel-concrete building unit to the side of the already installed modular combined steel-concrete building unit, and translate the modular combined steel-concrete building unit so that the inverted L-shaped steel parts 400 on its steel column 100 fall on the L-shaped steel parts 400 of the adjacent modular combined steel-concrete building unit; then finely adjust the modular combined steel-concrete building unit to a suitable position;

[0078] Installation step 2: As shown in Figure 6 shown, install bolts 700 and nuts in the through holes of the L-shaped steel parts 400 for fixation;

[0079] Installation Step 3: If there is C-shaped steel bar 320 on the outer side of the web of the bottom beam 300, then as shown in Figure 7 , insert erection bars at the double-beam joint between the bottom beams 300 of two adjacent modular composite steel-concrete building units, and tie the erection bars with the C-shaped steel bar 320 to form a steel reinforcement cage; if there are stud nails 330 on the outer side of the web of the bottom beam 300, then as shown in Figure 8 , place a prefabricated steel reinforcement cage at the joint between the bottom beams 300 of two adjacent modular composite steel-concrete building units.

[0080] Installation Step 4: Place the bottom formwork 340 on the steel sheet 310 at the double-beam joint, set end formworks at both ends of the double-beam joint, and then pour concrete at the double-beam joint.

[0081] Although the embodiments of the present invention are described in the specification, these embodiments are only for reference and should not limit the protection scope of the present invention. All omissions, substitutions and changes made without departing from the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A modular composite steel-concrete building unit, characterized in that: Including steel columns, top beams, bottom beams and L-shaped steel parts; The top beam and the bottom beam are respectively connected to the top and the bottom of the steel column to form a rectangular box structure; the L-shaped steel piece is fixed on the steel column and is located on the first facade and the second facade of the modular composite steel-concrete building unit, the first facade and the second facade are two opposite facades of the modular composite steel-concrete building unit, the L-shaped steel piece on the first facade and the L-shaped steel piece on the second facade are inverted relative to each other, and the L-shaped steel piece is provided with a through hole for installing bolts; when two adjacent modular composite steel-concrete building units are installed, the L-shaped steel piece of the left modular composite steel-concrete building unit and the inverted L-shaped steel piece of the right modular composite steel-concrete building unit are engaged with each other; when two adjacent modular composite steel-concrete building units are installed in place, a double beam joint will be formed between the bottom beams of the two adjacent modular composite steel-concrete building units; a floor slab is provided between the bottom beams, and a wall is provided on the floor slab; A plurality of steel sheets for bearing the joint template are arranged on the lower wing plate of the bottom beam; C-shaped steel bars or studs are arranged on the outer side of the web plate of the bottom beam; When C-shaped steel bars are arranged on the outer side of the web of the bottom beam, the C-shaped steel bars will cross each other at the double beam joints. At this time, the frame bars are inserted into the double beam joints between the bottom beams of two adjacent modular composite steel-concrete building units, and the frame bars are tied with the C-shaped steel parts to form a steel cage; When bolts are arranged on the outer side of the web of the bottom beam, during the assembly of the two left and right modular composite steel-concrete building units, a prefabricated steel cage is placed in advance at the joint between the bottom beams of the two adjacent modular composite steel-concrete building units; Place a bottom formwork on the steel sheet at the double-beam joint, set end formwork at both ends of the double-beam joint, and then pour concrete at the double-beam joint to complete the double-beam joint treatment, so that the floor slabs of the left and right building units form a whole.

2. The modular composite steel-concrete building unit according to claim 1 is characterized in that: The steel column is a steel square tube, and stiffening plates are built into the top and bottom of the steel square tube; the top beam and the bottom beam are both I-beams.

3. A method for producing a modular composite steel-concrete building unit as claimed in claim 1 or 2, characterized in that The steps include: Production step 1: Cut steel squares to be used as steel columns, cut I-beams to be used as top and bottom beams, cut angle steels and punch holes to form L-shaped steel parts; Production step 2: Built-in welded stiffening plates at the top and bottom of the steel column, welded steel sheets at the lower wing plate of the bottom beam, and welded C-shaped steel bars or studs on the outside of the web of the bottom beam; Production step 3: Welding L-shaped steel parts on the steel column; Production step 4: welding the steel columns, top beams and bottom beams to form a rectangular box structure; Production step 5: Arrange the floor slab reinforcement and cast the floor slab.

4. The method for producing modular composite steel-concrete building units according to claim 3, characterized in that: In step 3, a special tool is used to assist in welding the L-shaped steel part; the special tool includes a frame plate, a bearing plate, a guide column and a spring, the bottom surface of the frame plate is provided with two parallel vertical plates, and a slot matching the steel column is formed between the two vertical plates; the bottom surface of the frame plate is provided with a vertical guide cylinder, the guide column passes through the frame plate and the guide cylinder from top to bottom, the spring is sleeved on the guide column and located in the guide cylinder, the guide column is provided with a convex ring, the convex ring is pressed on the spring, the number of guide columns is two and a handle is provided between the two guide columns; the bottom of the guide column is connected to the horizontal bearing plate, and two positioning columns are provided on the bearing plate; The step 3 specifically includes the following steps: Production step 3.1: Place two steel columns parallely and horizontally on the working plane; Production step 3.2: Place the frame plate of the special tool on the steel column, and insert the slot under the frame plate into one of the steel columns; the load-bearing plate is located between the two steel columns; Production step 3.3: Put the through holes of the two L-shaped steel parts on the positioning columns of the load-bearing plate; Production step 3.4: spot weld the two L-shaped steel parts to the two steel columns respectively; Production step 3.5: Press the handle downward to make the two guide columns and the load-bearing plate move downward, and the positioning column is lowered to the bottom of the L-shaped steel part; then move the entire special tool along the steel column to the next position, continue to place a new L-shaped steel part on the positioning column and spot weld it; repeat this step until all L-shaped steel parts are spot welded; Production step 3.6: Separate the two steel columns and fully weld all the L-shaped steel parts.

5. The method for producing modular composite steel-concrete building units according to claim 4, characterized in that: It also includes production step 3.7: numbering the welded steel columns to ensure that the two completed steel columns are used in two adjacent modular composite steel-concrete building units.

6. The method for producing modular composite steel-concrete building units according to claim 4, characterized in that: One of the two vertical plates is provided with a bending portion, and when the slot between the two vertical plates is inserted into the steel column, a wedge-shaped area is formed between the bending portion and the steel column; The bearing plate is provided with a wedge plate, and when the bearing plate is at the highest position under the action of the spring, the wedge plate is inserted into the wedge-shaped area.

7. A method for installing a modular composite steel-concrete building unit as claimed in claim 1 or 2, characterized in that: The steps include: Installation step 1: hoist the modular composite steel-concrete building unit to the side of the installed modular composite steel-concrete building unit, translate the modular composite steel-concrete building unit so that the inverted L-shaped steel piece on its steel column falls on the L-shaped steel piece of the adjacent modular composite steel-concrete building unit; then fine-tune the modular composite steel-concrete building unit to a suitable position; Installation step 2: Install bolts and nuts in the through holes of the L-shaped steel piece to fix it; Installation step 3: If C-shaped steel bars are provided on the outer side of the web of the bottom beam, the stand bars are inserted into the double beam joints between the bottom beams of two adjacent modular composite steel-concrete building units, and the stand bars are tied with the C-shaped steel pieces to form a steel cage; if studs are provided on the outer side of the web of the bottom beam, the prefabricated steel cage is inserted into the joints between the bottom beams of two adjacent modular composite steel-concrete building units; Installation step 4: Place the bottom formwork on the steel sheet at the double beam joint, set the end formwork at both ends of the double beam joint, and then pour concrete at the double beam joint.

Images