Steel structure shock insulation stair assembly and construction method

Abstract

The invention relates to the technical field of buildings, in particular to a steel structure shock insulation stair assembly and a construction method, a steel structure is mainly used as a basic framework structure of a stair, the whole stair is hung on a main body structure through anchor bolt connection between steel stair columns and the main body structure, and physical partition of a shock insulation layer is achieved; by presetting the embedded parts, the installation of the steel stair does not influence the construction of a subsequent main body structure, and the waste of construction period caused by long time of the traditional construction process of the hanging stair is reduced; the steel structure parts can be customized in factories, and are suitable for various types of stair forms; compared with a concrete structure, the steel stair has the advantages that the dead weight is light, and the shock resistance is higher; a first bolt assembly and a second bolt assembly are arranged for a bolt connecting assembly used between the components according to the connecting requirement, and the construction flexibility is higher; and on the basis, connection between installation and construction structures is more stable, and the positive effect on improvement of construction quality is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of construction, in particular to a steel structure seismic isolation staircase component and a construction method. Background Art

[0002] The existing document with announcement number CN112095943A discloses a steel-concrete composite structure sliding support shock-absorbing staircase and its construction method, which includes steel stair columns, steel stair beams, stair resting platform plates and stair treads, and the stair resting platform plates and stair treads are cast-in-place reinforced concrete structural plates. The cast-in-place reinforced concrete structure and the stair facing bricks are bonded with mortar, which is convenient for construction, beautiful in effect, and not prone to hollowing and other quality defects; the top of the stair tread is integrally cast with the stair resting platform plate at its upper end, and the bottom is slidably connected with the stair resting platform plate at its lower end through a polytetrafluoroethylene sliding plate.

[0003] Generally, indoor stairs in reinforced concrete structures are made of the same material. For seismic isolation structures, considering the seismic isolation design, basement stairs are often suspended stairs. There are the following disadvantages in using suspended stairs: first, it is difficult to tie steel bars and support formwork, which is not convenient for construction; second, the construction period of suspended stairs is long, which affects the construction of the upper structure and easily causes delays in the construction period; on the other hand, for the connection between stair components, bolts are generally used for fastening. In order to improve its tightness, double nuts are generally used for locking, but the outer nuts may also loosen, and the locking firmness of the inner nuts is reduced, which needs further improvement and optimization.

[0004] To this end, the present invention proposes a steel structure seismic isolation staircase assembly and a construction method for solving the above problems. Summary of the invention

[0005] The object of the present invention is to provide a steel structure seismic isolation staircase assembly and a construction method to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: a steel structure seismic isolation staircase assembly, comprising a cast-in-place concrete beam, embedded parts, steel staircase columns, a lightweight partition wall, a steel staircase beam, a steel bottom plate, a first bolt assembly and a second bolt assembly;

[0007] The cast-in-place concrete beam is pre-embedded with embedded parts, the embedded parts are arranged on a pre-embedded connecting bottom plate, and the pre-embedded connecting bottom plate is connected to the top of the steel ladder column through a first bolt assembly;

[0008] A light partition wall is arranged between adjacent steel ladder columns, a steel bottom plate is arranged at the bottom end of the steel ladder columns, and the steel ladder columns are connected to the steel ladder beams by a second bolt assembly.

[0009] Preferably, the steel ladder beams at the same level form a support frame, a steel platform is provided on the support frame, and the steel platform is connected to the steel ladder steps.

[0010] Preferably, the embedded part is symmetrically provided with a first mounting hole, and the top end of the steel ladder column is symmetrically provided with a second mounting hole.

[0011] Preferably, the side wall of the steel ladder column is provided with a third mounting hole, and the end surface where the steel ladder beam is connected to the side wall of the steel ladder column is provided with a docking threaded groove.

[0012] Preferably, the first bolt assembly includes a first rubber sleeve, a connecting pad, a first connecting threaded column, a limiting screw head, a fastening slot, a connecting nut, a locking nut, a threaded hole and a locking screw; a connecting pad is fixedly provided at one end of the first rubber sleeve, a limiting screw head is fixedly provided at one end of the first connecting threaded column, and a fastening slot is provided on the outer side wall of the first connecting threaded column, the connecting nut is threadedly connected to the first connecting threaded column, and the locking nut is threadedly connected to the first connecting threaded column.

[0013] Preferably, the fastening slot is configured as an annular slot, and a threaded hole is provided on the side of the anti-loosening nut, and the threaded hole is threadedly connected to the locking screw.

[0014] Preferably, the second bolt assembly includes a second rubber sleeve, a connecting cone, a placement groove body, a second connecting threaded column, a cylindrical screw head, a locking slot, an auxiliary cap body, a rotating screw block, an auxiliary inclined surface, a first accommodating groove, a second accommodating groove, a movable pin shaft, a locking pin, a connecting spring, a connecting ring, and a spherical surface; a connecting cone is fixedly provided on one end of the second rubber sleeve, and a placement groove body is provided in the connecting cone, the notch of the placement groove body is circular, and the placement groove body is connected to the second rubber sleeve, a cylindrical screw head is fixedly provided on one end of the second connecting threaded column, a locking slot is provided on the outer side wall of the cylindrical screw head, and a rotating screw block is provided on the auxiliary cap body.

[0015] Preferably, an auxiliary inclined surface is arranged on the inner side of the cap opening of the auxiliary cap body, and the auxiliary inclined surface is arranged in a ring shape; and the locking groove is arranged in a ring shape.

[0016] Preferably, the outer side wall of the connecting cone is provided with a first accommodating groove, a second accommodating groove is provided in the first accommodating groove, one end of the second accommodating groove extends into the placement groove body, a movable pin is placed in the first accommodating groove, the end surface of one end of the movable pin is set as a spherical surface, and a locking pin is provided at the other end of the movable pin. A connecting spring is fixedly provided at the end of the movable pin connected to the locking pin, and a connecting ring is fixedly provided at the other end of the connecting spring, and the connecting ring is movably sleeved on the locking pin.

[0017] A construction method for a steel structure seismic isolation staircase assembly, the construction method comprising:

[0018] S1: The steel ladder columns and steel ladder beams are made of light steel structure, each run of the steel ladder steps is an integral steel structure step, the steel platform and steel bottom plate are made of patterned steel plates, and the lightweight partition walls are lightweight fireproof partition walls; customized production is achieved in the factory and transported to the site for installation;

[0019] S2: The first floor beam is a cast-in-place concrete beam. When constructing the first floor beam, the embedded parts must be embedded first. The embedded parts must be accurately positioned before the concrete can be poured. The embedded parts must be positioned and calibrated again before the concrete is finally set.

[0020] S3: After the concrete reaches the designed strength, the steel ladder column is installed; the top of the steel ladder column is firmly connected to the embedded part through the first bolt assembly, the lower part of the steel ladder column is not connected to the main structure, and the steel ladder column is in a suspended state;

[0021] S4: After the steel ladder column is installed, the steel ladder beam and the steel ladder column are connected by a second bolt assembly;

[0022] S5: After the steel ladder beam is installed, the steel ladder steps are installed; the steel ladder steps are connected to the steel ladder beam through the second bolt assembly, and the uppermost steel ladder steps are connected to the embedded parts in the cast-in-place concrete beam through the first bolt assembly;

[0023] S6: After the steel ladder steps are installed, the steel platform and steel bottom plate are installed; the steel platform and steel bottom plate use 5mm thick patterned plates and are welded to the steel ladder beams and steel ladder columns; after all steel structures are installed, the steel structure anti-corrosion and fireproofing construction is carried out;

[0024] S7: Lightweight partition walls are installed between steel staircase columns. The steel structure staircase and basement space are separated by lightweight partition walls to meet the building fire protection design requirements;

[0025] S8: Finally, carry out the construction of the decorative surface layer as needed.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The steel structure seismic isolation staircase assembly designed by the present invention mainly uses the steel structure as the basic skeleton structure of the stairs, and the stairs are hung on the main structure as a whole through the anchor connection between the steel staircase columns and the main structure, thereby realizing the physical separation of the seismic isolation layer; the present invention pre-installs embedded parts, and the installation of the steel stairs does not affect the subsequent construction of the main structure, thereby reducing the waste of construction period caused by the long traditional construction process of hanging stairs; the steel staircase construction method of the present invention can make steel structure components in the factory, which is suitable for various types of staircases, and is easy to construct and has guaranteed construction quality; the steel staircase of the present invention has a lighter dead weight and stronger seismic resistance than concrete structures; and for the bolt connection components used between the components, a first bolt assembly and a second bolt assembly are provided according to the connection requirements, and the construction flexibility is higher; and on this basis, the connection between the installed construction structures is more stable, which has a positive effect on improving the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the steel structure staircase of the present invention;

[0029] Figure 2 It is an exploded top view of the connection between the top of the steel ladder column and the embedded component structure of the present invention;

[0030] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the local structural connection;

[0031] Figure 4 This is an exploded bottom view of the connection between the top of the steel ladder column and the embedded component structure of the present invention;

[0032] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the local structural connection;

[0033] Figure 6 It is an exploded schematic diagram of the connection between the steel ladder column and the steel ladder beam structure of the present invention;

[0034] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the local structural connection;

[0035] Figure 8 It is a schematic diagram of the left side of the second bolt assembly structure connection of the present invention;

[0036] Fig. 9 It is a schematic diagram of the right side of the second bolt assembly structure connection of the present invention;

[0037] Fig.10 For the present invention Fig. 9 A magnified schematic diagram of the local structural connection;

[0038] Fig.11It is a schematic diagram of the connection between the second rubber sleeve and the connecting truncated cone structure of the present invention.

[0039] In the figure: cast-in-place concrete beam 1, embedded parts 2, steel ladder column 3, lightweight partition wall 4, steel ladder beam 5, steel platform 6, steel base plate 7, steel ladder step 8, embedded connection base plate 9, first installation hole 10, second installation hole 11, first rubber sleeve 1201, connection pad 1202, first connection threaded column 1203, limiting screw head 1204, fastening card slot 1205, connection nut 1206, anti-loosening nut 1207, threaded hole 1208, locking screw 1209, third installation Hole 13, docking threaded groove body 14, second rubber sleeve 1501, connecting cone 1502, placement groove body 1503, second connecting threaded column 1504, cylindrical screw head 1505, locking slot 1506, auxiliary cap body 1507, rotating screw block 1508, auxiliary inclined surface 1509, first accommodating groove 1510, second accommodating groove 1511, movable pin 1512, locking pin 1513, connecting spring 1514, connecting ring 1515, spherical surface 1516. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention are described clearly and completely below. The embodiments of the present invention and all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0041] Example 1: Please refer to Figure 1-Figure 11 A steel structure seismic isolation staircase assembly comprises a cast-in-place concrete beam 1, an embedded part 2, a steel staircase column 3, a lightweight partition wall 4, a steel staircase beam 5, a steel bottom plate 7, a first bolt assembly and a second bolt assembly.

[0042] An embedded part 2 is embedded in the cast-in-place concrete beam 1, wherein a first mounting hole 10 is symmetrically arranged on the embedded part 2, and a second mounting hole 11 is symmetrically arranged at the top of the steel ladder column 3; the embedded part 2 is arranged on the embedded connecting base plate 9, and the embedded connecting base plate 9 is connected to the top of the steel ladder column 3 by a first bolt assembly; a lightweight partition wall 4 is arranged between adjacent steel ladder columns 3, and a steel base plate 7 is arranged at the bottom end of the steel ladder column 3, and a third mounting hole 13 is arranged on the side wall of the steel ladder column 3, and a butt threaded groove 14 is arranged on the end face where the steel ladder beam 5 is connected to the side wall of the steel ladder column 3; the steel ladder column 3 and the steel ladder beam 5 are connected by a second bolt assembly; the steel ladder beam 5 on the same level forms a support frame, and a steel platform 6 is arranged on the support frame, and the steel platform 6 is connected to the steel ladder step 8.

[0043] All components used are fire-resistant components with a fire resistance limit of 2 hours. The present invention uses a steel structure as the basic skeleton structure of the stairs, and the steel staircase columns 3 are connected to the main structure through anchor bolts so that the stairs are hung above the main structure as a whole, thereby realizing the physical separation of the seismic isolation layer. The present invention pre-installs embedded parts 2, so that the installation of the steel stairs does not affect the subsequent construction of the main structure, thereby reducing the waste of construction time caused by the long traditional construction process of hanging stairs. In the steel staircase construction method of the present invention, steel structure components can be customized in the factory, which is suitable for various types of staircases, and is easy to construct and has guaranteed construction quality. Compared with concrete structures, the steel staircase of the present invention has a lighter weight and stronger earthquake resistance.

[0044] A construction method for a steel structure seismic isolation staircase assembly, the construction method comprising:

[0045] S1: The steel ladder column 3 and the steel ladder beam 5 are made of light steel structure, each run of the steel ladder step 8 is an integral steel structure step, the steel platform 6 and the steel bottom plate 7 are made of patterned steel plates, and the lightweight partition wall 4 is a lightweight fireproof partition wall; customized production is realized in the factory and transported to the site for installation;

[0046] S2: The first floor beam is a cast-in-place concrete beam 1. When constructing the first floor beam, the embedded parts 2 are embedded first. The embedded parts must be accurately positioned before the concrete pouring of the first floor beam can be carried out. The embedded parts are positioned and calibrated again before the concrete is finally set.

[0047] S3: After the concrete reaches the designed strength, the steel ladder column 3 is installed; the top of the steel ladder column 3 is firmly connected to the embedded part 2 through the first bolt assembly, and the lower part of the steel ladder column 3 is not connected to the main structure, and the steel ladder column is in a suspended state;

[0048] S4: After the steel ladder column 3 is installed, the steel ladder beam 5 is connected to the steel ladder column 3 by a second bolt assembly;

[0049] S5: After the steel ladder beam 5 is installed, the steel ladder step 8 is installed; the steel ladder step 8 is connected to the steel ladder beam 5 by a second bolt assembly, and the uppermost steel ladder step is connected to the embedded part 2 in the cast-in-place concrete beam 1 by a first bolt assembly;

[0050] S6: After the steel ladder steps 8 are installed, the steel platform 6 and the steel bottom plate 7 are installed; the steel platform 6 and the steel bottom plate 7 are made of 5mm thick patterned plates, which are welded to the steel ladder beam 5 and the steel ladder column 3; after all the steel structures are installed, the steel structure anti-corrosion and fireproofing construction is carried out;

[0051] S7: Lightweight partition walls 4 are installed between the steel staircase columns 3. The steel structure staircase and the basement space are separated by the lightweight partition walls 4 to meet the building fire protection design requirements;

[0052] S8: Finally, carry out the construction of the decorative surface layer as needed.

[0053] Example 2: Based on Example 1, please refer to Figure 2-Figure 5 The first bolt assembly here includes a first rubber sleeve 1201, a connection pad 1202, a first connection threaded column 1203, a limiting screw head 1204, a fastening slot 1205, a connection nut 1206, a lock nut 1207, a threaded hole 1208 and a locking screw 1209; one end of the first rubber sleeve 1201 is fixedly provided with a connection pad 1202, one end of the first connection threaded column 1203 is fixedly provided with a limiting screw head 1204, and the outer side wall of the first connection threaded column 1203 is provided with a fastening slot 1205, the connection nut 1206 is threadedly connected to the first connection threaded column 1203, and the lock nut 1207 is threadedly connected to the first connection threaded column 1203; the fastening slot 1205 here is set as an annular groove, and the side of the lock nut 1207 is provided with a threaded hole 1208, and the threaded hole 1208 is threadedly connected to the locking screw 1209.

[0054] In this embodiment, a threaded hole 1208 is set on the side of the anti-loosening nut 1207, and a locking screw 1209 is set in the threaded hole 1208. After tightening the anti-loosening nut 1207, the locking screw 1209 is threadedly connected to the threaded hole 1208 until one end of the locking screw 1209 is engaged with the fastening groove 1205 on the side of the first connecting threaded column 1203. A locking function is provided for the anti-loosening nut 1207, thereby making the loosening effect of the anti-loosening nut 1207 more stable. In addition, during the connection and installation process, the first rubber sleeve 1201 provided also provides a shock-absorbing auxiliary effect for the connection of the first connecting threaded column 1203, further improving its connection stability.

[0055] Example 3: Based on Example 2, please refer to Figure 6-Figure 11The second bolt assembly here includes a second rubber sleeve 1501, a connecting truncated cone 1502, a placement slot 1503, a second connecting threaded column 1504, a cylindrical screw head 1505, a locking slot 1506, an auxiliary cap body 1507, a rotating screw block 1508, an auxiliary inclined surface 1509, a first receiving slot 1510, a second receiving slot 1511, a movable pin 1512, a locking pin 1513, a connecting spring 1514, a connecting ring 1515, and a spherical surface 1516; one end of the second rubber sleeve 1501 is fixedly provided with a connecting truncated cone 1502, and the connecting A placement groove 1503 is provided in the truncated cone 1502, and the groove of the placement groove 1503 is set to be circular, and the placement groove 1503 is connected to the second rubber sleeve 1501, and a cylindrical screw head 1505 is fixedly provided at one end of the second connecting threaded column 1504, and a locking slot 1506 is provided on the outer wall of the cylindrical screw head 1505, and a rotating screw block 1508 is provided on the auxiliary cap body 1507; the inner side of the cap opening of the auxiliary cap body 1507 is provided with an auxiliary inclined surface 1509, and the auxiliary inclined surface 1509 is set to be annular; the locking slot 1506 is set to be annular.

[0056] The outer wall of the connecting cone 1502 here is provided with a first accommodating groove 1510, and a second accommodating groove 1511 is provided in the first accommodating groove 1510. One end of the second accommodating groove 1511 extends into the placement groove body 1503. A movable pin 1512 is placed in the first accommodating groove 1510. The end surface of one end of the movable pin 1512 is set as a spherical surface 1516, and the other end of the movable pin 1512 is provided with a locking pin 1513. The movable pin 1512 is fixedly provided with a connecting spring 1514 at the end connected to the locking pin 1513, and the other end of the connecting spring 1514 is fixedly provided with a connecting ring 1515, and the connecting ring 1515 is movably sleeved on the locking pin 1513.

[0057] In this embodiment, on the one hand, the second rubber sleeve 1501 and the connecting cone 1502 are provided to provide a shock-absorbing auxiliary effect for the connection of the second connecting threaded column 1504. Furthermore, after the second connecting threaded column 1504 is connected and fixed, the auxiliary cap body 1507 is threadedly connected to the connecting cone 1502. The auxiliary cap body 1507 squeezes the movable pin 1512, so that the movable pin 1512 pushes the locking pin 1513, and then one end of the locking pin 1513 is stuck in the locking groove 1506 on the side of the cylindrical screw head 1505, providing a locking effect for the second connecting threaded column 1504. On this basis, the auxiliary cap body 1507 can also provide a protective effect for the cylindrical screw head 1505.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel structure seismic isolation staircase assembly, characterized in that: It comprises a cast-in-place concrete beam (1), embedded parts (2), a steel ladder column (3), a lightweight partition wall (4), a steel ladder beam (5), a steel bottom plate (7), a first bolt assembly and a second bolt assembly; An embedded part (2) is pre-embedded in the cast-in-place concrete beam (1), the embedded part (2) is arranged on a pre-embedded connecting base plate (9), and the pre-embedded connecting base plate (9) is connected to the top of the steel ladder column (3) via a first bolt assembly; A lightweight partition wall (4) is arranged between adjacent steel ladder columns (3), a steel bottom plate (7) is arranged at the bottom end of the steel ladder columns (3), and the steel ladder columns (3) and the steel ladder beam (5) are connected by a second bolt assembly.

2. A steel structure seismic isolation staircase assembly according to claim 1, characterized in that: The steel ladder beams (5) on the same level form a support frame, on which a steel platform (6) is arranged, and the steel platform (6) is connected to the steel ladder steps (8).

3. The steel structure seismic isolation staircase assembly according to claim 1, characterized in that: The embedded part (2) is symmetrically provided with a first mounting hole (10), and the top end of the steel ladder column (3) is symmetrically provided with a second mounting hole (11).

4. The steel structure seismic isolation staircase assembly according to claim 1, characterized in that: The side wall of the steel ladder column (3) is provided with a third mounting hole (13), and the end surface of the steel ladder beam (5) connected to the side wall of the steel ladder column (3) is provided with a butt-jointed threaded groove body (14).

5. The steel structure seismic isolation staircase assembly according to claim 1, characterized in that: The first bolt assembly comprises a first rubber sleeve (1201), a connection pad (1202), a first connection threaded column (1203), a limiting screw head (1204), a fastening slot (1205), a connection nut (1206), a locking nut (1207), a threaded hole (1208) and a locking screw (1209); one end of the first rubber sleeve (1201) is fixedly provided with a connection pad (1202), one end of the first connection threaded column (1203) is fixedly provided with a limiting screw head (1204), and an outer side wall of the first connection threaded column (1203) is provided with a fastening slot (1205), the connection nut (1206) is threadedly connected to the first connection threaded column (1203), and the locking nut (1207) is threadedly connected to the first connection threaded column (1203).

6. A steel structure seismic isolation staircase assembly according to claim 5, characterized in that: The fastening slot (1205) is configured as an annular slot, and a threaded hole (1208) is provided on the side of the anti-loosening nut (1207), and the threaded hole (1208) is threadedly connected to the locking screw (1209).

7. The steel structure seismic isolation staircase assembly according to claim 1, characterized in that: The second bolt assembly comprises a second rubber sleeve (1501), a connecting truncated cone (1502), a placement slot (1503), a second connecting threaded column (1504), a cylindrical screw head (1505), a locking slot (1506), an auxiliary cap body (1507), a rotating screw block (1508), an auxiliary inclined surface (1509), a first receiving slot (1510), a second receiving slot (1511), a movable pin (1512), a locking pin (1513), a connecting spring (1514), a connecting ring (1515), and a spherical surface (1516); the second rubber A connecting truncated cone (1502) is fixedly provided on one end of the sleeve (1501), and a placement groove (1503) is provided in the connecting truncated cone (1502), the notch of the placement groove (1503) is arranged in a circular shape, and the placement groove (1503) is connected to the second rubber sleeve (1501), a cylindrical screw head (1505) is fixedly provided on one end of the second connecting threaded column (1504), and a locking slot (1506) is provided on the outer side wall of the cylindrical screw head (1505), and a rotating screw block (1508) is provided on the auxiliary cap body (1507).

8. The steel structure seismic isolation staircase assembly according to claim 7, characterized in that: An auxiliary inclined surface (1509) is arranged on the inner side of the cap opening of the auxiliary cap body (1507), and the auxiliary inclined surface (1509) is arranged in a ring shape; and the locking slot (1506) is arranged in a ring shape.

9. The steel structure seismic isolation staircase assembly according to claim 7, characterized in that: The outer side wall of the connecting cone (1502) is provided with a first accommodating groove (1510), a second accommodating groove (1511) is provided in the first accommodating groove (1510), one end of the second accommodating groove (1511) extends into the placement groove body (1503), a movable pin shaft (1512) is placed in the first accommodating groove (1510), an end surface of one end of the movable pin shaft (1512) is provided as a spherical surface (1516), a locking pin (1513) is provided at the other end of the movable pin shaft (1512), a connecting spring (1514) is fixedly provided at the end of the movable pin shaft (1512) connected to the locking pin (1513), a connecting ring (1515) is fixedly provided at the other end of the connecting spring (1514), and the connecting ring (1515) is movably sleeved on the locking pin (1513).

10. A construction method for a steel structure seismic isolation staircase assembly according to any one of claims 1 to 9, characterized in that: The construction method is: S1: The steel ladder column (3) and the steel ladder beam (5) are made of light steel structure, each run of the steel ladder step (8) is an integral steel structure step, the steel platform (6) and the steel bottom plate (7) are made of patterned steel plates, and the light partition wall (4) is a light fireproof partition wall; customized production is achieved in the factory and transported to the site for installation; S2: The first floor beam is a cast-in-place concrete beam (1). When constructing the first floor beam, the embedded parts (2) are embedded first. The embedded parts must be accurately positioned before the concrete pouring of the first floor beam can be carried out. The embedded parts are positioned and calibrated again before the concrete is finally set. S3: After the concrete reaches the designed strength, the steel ladder column (3) is installed; the top of the steel ladder column (3) is firmly connected to the embedded part (2) through the first bolt assembly, the lower part of the steel ladder column (3) is not connected to the main structure, and the steel ladder column is in a suspended state; S4: After the steel ladder column (3) is installed, the steel ladder beam (5) is connected to the steel ladder column (3) by means of a second bolt assembly; S5: After the steel ladder beam (5) is installed, the steel ladder steps (8) are installed; the steel ladder steps (8) are connected to the steel ladder beam (5) via a second bolt assembly, and the uppermost steel ladder steps are connected to the embedded parts (2) in the cast-in-place concrete beam (1) via a first bolt assembly; S6: After the steel ladder steps (8) are installed, the steel platform (6) and the steel bottom plate (7) are installed; the steel platform (6) and the steel bottom plate (7) are made of 5 mm thick patterned plates and are welded to the steel ladder beams (5) and steel ladder columns (3); after all the steel structures are installed, the steel structure anti-corrosion and fireproofing construction is carried out; S7: Lightweight partition walls (4) are installed between the steel staircase columns (3). The steel structure staircase and the basement space are separated by the lightweight partition walls (4), meeting the fire protection design requirements of the building; S8: Finally, carry out the construction of the decorative surface layer as needed.

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