Steel platform for high-altitude large-span cantilever concrete corridor construction

Abstract

The invention relates to a steel platform for high-altitude large-span cantilever concrete corridor construction, and relates to the technical field of constructional engineering. During construction, firstly, structural steel is pre-embedded in structural boundary beams on the two sides of a lower structure to form a steel reinforced concrete beam, the structural steel at the beam end overhangs and extends outwards by a certain length, and then overhung structural steel sections are connected with lower-layer structural columns and structural steel inclined struts to form a triangular supporting bracket bearing system; then a profile steel main beam is installed, the profile steel main beam and the triangular supporting brackets are connected through high-strength bolts and groove welding, and the profile steel main beam and the profile steel concrete beam are connected in a hinged mode through a connecting plate; the profile steel main beam is connected with the structural boundary beam by welding; all the I-shaped steel secondary beams are placed at the upper parts of the section steel girder main beams and are fixed by pressing plate locking rings; and after the primary and secondary beams are fixed, the wood springboards are arranged on the secondary beams for horizontal closing. The problem that a high-altitude large-span cantilever concrete corridor structure is difficult in formwork erecting is solved, and meanwhile the method has the advantages of being safe and reliable in construction, convenient to construct and operate, good in economical efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and is particularly suitable for an operating platform for the construction of a large-span cantilevered concrete structure, in particular to a steel platform for the construction of a high-altitude large-span cantilevered concrete corridor. Background Art

[0002] With the improvement of domestic construction level, in order to meet the different requirements of building appearance, more and more high-rise buildings have large-span cast-in-place reinforced concrete cantilever corridors. Conventional cantilever structures usually use full-height scaffolding or cantilevered I-beams as supports during construction. However, full-height scaffolding or cantilevered I-beams as supports also have the following defects: (1) When the scaffolding height exceeds 50 meters, the support system used requires a large number of steel pipe racks. During actual construction, scaffolders need to work continuously at high altitude for a long time, which leads to a long operation period and thus poses a major safety hazard; at the same time, more turnover materials are consumed, resulting in a high overall construction cost. (2) The cantilevered I-beam platform is limited by the span (usually ≤6 meters) and cannot meet the requirements of large spans. At the same time, it is generally suspended by inclined steel wire ropes, which need to be connected to the upper floor slab and cannot be installed before the upper floor slab is erected. In addition, the steel wire rope and the platform are connected by ring buckles, which are limited in load-bearing capacity. The larger the span, the more unstable the connection is and the more likely it is to break, causing safety accidents.

[0003] This patent proposes a steel platform solution to address the above-mentioned defects. Summary of the Invention

[0004] The purpose of the present invention is to rely on the operating platform constructed with steel beams between the north and south towers of the cantilevered corridor to carry out the formwork erection and reinforced concrete pouring construction of the cantilevered corridor, forming a steel platform for the construction of high-altitude large-span cantilevered concrete corridors with simple construction methods, safe and reliable bearing capacity, convenient construction operation and excellent economy, so as to solve the problems raised in the above-mentioned background technology.

[0005] The present invention solves its technical problem by adopting a technical solution: a steel platform for the construction of a high-altitude large-span cantilevered concrete corridor, comprising: structural side beams, a lower structure, steel beams, I-beams, steel plate embedded parts, diagonal braces, pressure plate locking rings and wooden springboards, etc. The steel-concrete beam is an internally embedded steel beam, with one end of the steel extending outward and cantilevered; the steel beam in the middle part of the steel platform is hingedly connected to the steel-concrete beam through a connecting plate with high-strength bolts; the pre-embedded steel plate of the lower structural column, the steel beam and the diagonal brace are installed and connected to form a triangular support bracket; the steel beam at the outer part of the steel platform is welded to the structural side beam through pre-embedded steel plate embedded parts; the steel beam of the outer part of the steel platform and the triangular support bracket are rigidly connected with high-strength bolts and groove welding; after the installation of the steel beam is completed, a secondary beam I-beam is placed on the upper part according to the spacing between the formwork uprights; the I-beam secondary beam and the steel main beam are fixed with a pressure plate locking ring; the I-beam partially placed on the structural plate is fixed with a pressure plate locking ring; after the main and secondary beams are fixed, a wooden springboard is arranged on the secondary beam for horizontal enclosure to form an integral steel platform structure.

[0006] Furthermore, the aforementioned steel-concrete beam has a built-in steel beam, and studs are welded to the upper and lower flange plates of the steel beam to improve the bond strength with the concrete.

[0007] Furthermore, the aforementioned steel-concrete beam has a built-in steel beam, and connecting plates are arranged at a certain interval on one side of the steel beam, and the connecting plates are welded to the upper and lower flanges and webs of the steel beam.

[0008] Furthermore, the steel beam in the middle part of the aforementioned steel platform is connected to the steel concrete beam through a connecting plate, and the connection form is a high-strength bolt hinge. During installation, the strength of the steel concrete beam must reach the designed concrete strength.

[0009] Furthermore, the aforementioned diagonal brace is made of steel, the top of the aforementioned diagonal brace is fixed to the cantilevered steel end of the aforementioned steel-concrete beam by high-strength bolts, and the bottom of the aforementioned diagonal brace is fixed to the structural embedded parts in the aforementioned lower structure by welding.

[0010] Furthermore, the aforementioned steel beam and the aforementioned structural side beam are welded and fixed by embedded steel plates, the aforementioned triangular bracket steel beam is welded with a connecting plate, the triangular bracket steel beam and the steel beam are fixed with high-strength bolts, and the upper and lower flange plates are welded at the junction of the groove.

[0011] Furthermore, a pressure plate for limiting the displacement of the I-beam is fixed at the intersection of the aforementioned steel beam and the I-beam.

[0012] Furthermore, the aforementioned limiting pressure plates at the intersection of the steel beam and the I-beam are installed and fastened using threaded round steel and multiple sets of fixing nuts.

[0013] Furthermore, the ends of the aforementioned I-beams placed on the floor slab are provided with pressure plates for limiting the displacement of the I-beams.

[0014] Furthermore, the aforementioned I-beam end limit pressure plates placed at the floor slab are all installed and fastened using threaded round steel and multiple sets of fixing nuts.

[0015] Furthermore, the aforementioned I-beam compression ring placed at the floor slab position is made of steel plates and threaded round steel, and the I-beam compression ring is embedded and fixed before the main structure concrete is poured.

[0016] Furthermore, the aforementioned main structure is a cast-in-place reinforced concrete structure.

[0017] Compared with existing conventional construction technologies, the beneficial effects of the above technical solution adopted in the present invention are: the construction method of the operating platform device is simple, the construction speed is fast and efficient, the construction cost is low, and the bearing capacity performance is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A perspective view of a steel platform according to the present invention; Figure 2 It is a schematic plan view of the arrangement of the primary and secondary beams of the steel platform of the present invention; Figure 3 A large-scale drawing of the connection between the steel platform type steel beam and the structural edge beam of the present invention; Figure 4 A large-scale drawing of the connection between the steel platform steel beam and the steel concrete beam of the present invention; Figure 5 This is a detailed drawing of the connection between the steel platform section steel beam and the section steel beam of the present invention; Figure 6 It is a cross-sectional view of the connection between the steel platform section steel beam and the section steel beam of the present invention; Figure 7 This is a large-scale drawing of the steel platform type triangular brace of the present invention; Figure 8 It is a plan view of the connection between the steel platform type steel beam and the I-beam of the present invention; Figure 9 This is a cross-sectional view of the connection between the steel platform beam and the I-beam of the present invention; Explanation of reference numerals: 1-structural edge beam; 2-steel concrete beam; 3-substructure; 4-steel plate embedded parts; 5-steel beam; 6-I-beam; 7-diagonal brace; 8-pressure plate locking ring; 9-pressure plate; 10-threaded round steel; 11-connecting plate; 12-high-strength bolt; 13-stud; 14-rebar; 15-flange plate; 16-fixing nut; 17-wooden gangplank DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, the present invention provides an implementation structure of a steel platform for the construction of a high-altitude, large-span cantilevered concrete corridor, which mainly comprises a structural side beam (1), a steel-concrete beam (2), a lower structure (3), a steel beam (5), an I-beam (6), a diagonal brace (7), a pressure plate locking ring (8), a wooden springboard (17), etc.

[0021] like Figure 1 and Figure 2 As shown, the steel concrete beam 2 medium steel beam is cantilevered from the side of the structure as Figure 7 The upper load-bearing beam supported by the triangular corbel is supported by a steel brace 7 installed at the bottom of the cantilevered steel beam section, allowing the steel beam to withstand greater construction loads. The steel-concrete beam 2 is hingedly connected to the steel beam 5 using high-strength bolts. The structural side beam 1 is hingedly connected to the steel beam 5 using steel plate embedded parts pre-buried in the structural side beam 1. The steel beam 5 supported by the triangular corbel and the cantilevered steel beam section are fixed using high-strength bolts and upper and lower flange plate groove welding. After the steel platform main beam 5 is installed, the secondary beam I-beam 6 is placed on top. The I-beam 6 is arranged according to the spacing of the upper formwork support columns. The intersection of the steel beam 5 and the I-beam 6 is positioned and fixed with a pressure plate lock ring 8 to prevent displacement. After all installation is completed, a wooden springboard 17 is laid on top of the I-beam 6 and secured.

[0022] like Figure 3 As shown, a steel plate embedded part 4 is embedded in the structural side beam 1 at the side beam part, and the connecting plate 11 is welded to the steel plate embedded part 4. When the steel platform is installed, the steel beam 5 and the connecting plate 11 are fixed with high-strength bolts. During the implementation process, it should be noted that: ① the specification and length of the anchor steel bar on the back of the steel plate embedded part 4 meet the design requirements and the anchor steel bar and steel plate are perforated welded and the welding quality is guaranteed; ② the welding quality and weld width of the connecting plate 11 and the steel plate embedded part 4 are qualified to ensure the stress safety of the steel platform during construction; ③ after the steel beam 5 and the connecting plate 11 are fixed, the axial force of the high-strength bolt tightening must be checked; ④ the steel plate embedded part 4 needs to be pre-embedded before the concrete of the structural side beam 1 is poured; ⑤ the concrete strength of the structural side beam 1 reaches the design strength before the steel beam 5 can be installed.

[0023] like Figure 4 As shown, the upper and lower flanges and webs on one side of the steel concrete beam 2 are welded with connecting plates 11 at a certain interval. When the steel platform is installed, the steel beam 5 and the connecting plate 11 are fixed with high-strength bolts. During the implementation process, it should be noted that: ① the connecting plate 11 will cut off part of the longitudinal reinforcement on the side of the beam. To avoid this problem, the reinforcement and the connecting plate need to be connected with a connector. ② the welding quality and weld width of the connecting plate 11 and the steel concrete beam 2 must be qualified to ensure the stress safety of the steel platform during construction. ③ after the steel beam 5 and the connecting plate 11 are fixed, the axial force of the high-strength bolts must be checked. ④ the concrete strength of the steel concrete beam 2 must reach the design strength before the steel beam 5 can be installed.

[0024] like Figure 5 and Figure 6 As shown, the connection between the steel beam 5 and the cantilevered steel beam section is fixed by a connecting plate 11. After the connecting plate 11 and the steel beam 5 are connected and fixed with high-strength bolts, groove welding is performed at the intersection of the upper and lower flange plates of the steel beam 5 and the cantilevered steel beam section.

[0025] like Figure 7 As shown, the triangular corbel support consists of the cantilevered steel beam section of the steel-concrete beam 2, a diagonal brace 7, a steel plate embedded part 4, and the lower structure 3. The diagonal brace 7 is made of steel, and the lower part of the diagonal brace 7 is welded to the steel plate embedded part 4. The upper part of the steel diagonal brace 7 is connected to the cantilevered steel beam section via high-strength bolts to form a triangular stabilization system. During implementation, it is important to note that: ① The steel plate embedded part 4 must be pre-embedded before the concrete of the lower structure 3 is poured. ② Because this part is subjected to high forces during construction, the quality of the welds must be ensured, the inclination angle of the steel diagonal brace is correct, and the tightening force of the high-strength bolts meets the requirements.

[0026] like Figure 8 and Figure 9 As shown, the I-beam 6 is placed on the steel beam 5. In order to prevent the I-beam from moving and improve the overall stability of the steel platform under force, a pressure plate locking ring 8 is used to fix the junction of the steel beam 5 and the I-beam 6. The pressure plate locking ring 8 consists of a pressure plate 9, a threaded round steel 10 and a fixing nut 16.

[0027] This embodiment only briefly describes the implementation method of the construction steel platform. In actual application, the dimensions of each component can be adjusted according to specific circumstances.

Claims

1. A steel platform for the construction of high-altitude, large-span cantilevered concrete corridors, characterized by: The steel platform is composed of connecting parts, steel and I-beams, including steel plate embedded parts (4), steel beams (5), I-beams (6), diagonal braces (7), connecting plates (11) and wooden springboards (17); the embedded steel beams (5) are passed through the side beams of the lower structure (3) to form a steel concrete beam (2) structure, the end of the steel concrete beam (2) extends outward to form a cantilevered steel section, and the cantilevered steel section of the steel concrete beam (2) is supported on the lower structure (3) by diagonal braces (7); the load-bearing main beam is a plurality of steel beams (5), which are arranged in the air on the structural side beams (1), the steel concrete beams (2) and the triangular support brackets; I-beams (6) are placed on the upper part of the steel beams (5) at a certain interval; and wooden springboards (17) are laid on the I-beams (6) to form an integral steel platform structure.

2. The steel platform for the construction of a high-altitude, large-span cantilevered concrete corridor according to claim 1, characterized in that: The built-in steel beam side of the steel concrete beam (2) is welded with a connecting plate (11), and the steel beam (5) and the exposed connecting plates (11) of the steel concrete beams (2) at both ends are connected across space using high-strength bolts.

3. The steel platform for the construction of a high-altitude, large-span cantilevered concrete corridor according to claim 1 is characterized by: The diagonal brace (7) is made of section steel, and the cantilevered section of the steel concrete beam (2) is firmly supported on the lower structure (3) through the diagonal brace (7) to form a triangular support bracket load-bearing member; the upper part of the diagonal brace (7) is connected with high-strength bolts, and the lower part is welded to the steel plate embedded part (4).

4. The steel platform for the construction of a high-altitude, large-span cantilevered concrete corridor according to claim 1 is characterized by: The I-beam (6) is placed on the steel beam (5), and the intersection of the steel beam (5) and the I-beam (6) is fixed by a pressure plate lock ring (8).

5. The steel platform for the construction of a high-altitude, large-span cantilevered concrete corridor according to claim 4 is characterized by: The pressure plate lock ring (8) is made of a pressure plate (9), a threaded round steel (10), and a fixing nut (16).

6. The steel platform for the construction of a high-altitude, large-span cantilevered concrete corridor according to claim 1, characterized in that: The structural side beams (1), steel-concrete beams (2), and lower structure (3) are all cast-in-place reinforced concrete structures.

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