A large-span cantilever beam structure and construction technology

Abstract

The invention discloses a large-span cantilever beam structure and a construction process, belonging to the technical field of building construction. The invention divides a steel cantilever beam into several sections, which are then installed by hoisting and auxiliary support, and the sections are mainly divided into longitudinal sections and supplemented by transverse sections, so that the influence of the steel cantilever beam on the stress of the structure is minimized. By adopting this segmentation form, on the one hand, the requirements of hoisting performance can be met, and on the other hand, the lower structure can be partially used as a temporary support basis to achieve the purpose of stable construction.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a large-span cantilever beam structure and a construction process. Background Art

[0002] With the diversified development of architecture, various beautiful architectural structures have been designed and realized. There is currently a spiral staircase building, which consists of a core column, a large-span two-way cantilever beam set on the top of the core column, and a ladder-like structure spirally arranged downward from both sides of the cantilever beam. The two-way cantilever beam set on the top of the core column has a large span, is difficult to install, and is difficult to control the hoisting balance. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a large-span cantilever beam structure and a construction process, which can achieve fast, safe and stable construction through a steel cantilever beam structure hoisted in sections.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The invention comprises a core column and a cantilever beam, wherein the cantilever beam comprises a box connecting section arranged on the top of the core column, wherein both ends of the box connecting section extend to connect a plurality of transverse sections spliced ​​end to end, and the transverse section comprises two longitudinal sections spliced ​​side by side.

[0006] Furthermore, the box connecting section includes two transversely spliced ​​half blocks, the half blocks are spliced ​​around the outside of the top end of the core column, and also includes a top plate, and the top plate is connected to the half blocks respectively through a plurality of stiffening plates.

[0007] Furthermore, it also includes a tower fixed to the ground, and the tower is supported on the bottom surface of one end of each of the longitudinal segments.

[0008] Furthermore, the interior of the longitudinal section is hollow, two longitudinal sections connected side by side are interconnected, a plurality of manholes are provided on the top of the transverse section for construction workers to enter the interior of the transverse section, and a plurality of support plates are welded inside the transverse section.

[0009] Furthermore, it also includes a safety part, which includes a horizontal beam additionally suspended by the crane, and a plurality of safety platforms are suspended along the horizontal beam. The safety platform includes a base plate, and a plurality of vertical rods extend upward from the edge of the base plate. The upper ends of the vertical rods are fixedly connected to a circle of ring frames, and the ring frames are connected to the horizontal beam through steel ropes. The vertical rods are respectively against the inner side surfaces of the manhole, and the safety platform extends into the manhole, and the base plate falls on the inner bottom surface of the transverse section.

[0010] Furthermore, it also includes a guardrail, which is fixed with a plurality of sliding pins. A vertical groove is provided on the vertical rod, and the sliding pin is slidably arranged in the vertical groove. The bottom end of the vertical groove is located in the middle section of the vertical rod, so that when the sliding pin is located at the bottom end of the vertical groove, the guardrail is blocked in the middle section of the vertical rod, and after the safety platform extends into the manhole, the sliding pin is blocked by the edge of the manhole, so that the guardrail is located on the top surface of the horizontal section.

[0011] Furthermore, a vertical rod for holding is extended upward from the middle of the bottom plate.

[0012] A large-span cantilever beam construction process, the steps are as follows:

[0013] S1. Install the box connection section, first connect one half of the box to the top plate through the stiffener, and then suspend the two half boxes on the left and right sides and splice them on the top of the core column;

[0014] S2. Install the transverse section, divide the transverse section into longitudinal sections that are spliced ​​to each other, splice the two longitudinal sections to the sides of the box connecting section by suspending, and support them on the bottom side of the outer end of the longitudinal section by a tower frame;

[0015] S3. A manhole is opened in the middle of the top surface of the transverse section, and the crossbeam is suspended above the transverse section being spliced, and the safety platform is extended into the manhole so that the bottom plate of the safety platform falls on the bottom surface of the inside of the transverse section, and the guardrail is placed on the top surface of the transverse section;

[0016] S4. Construction workers enter the manhole through the safety platform and carry out connection work inside the transverse section, connect and weld the transverse section to the box connecting section, splice and weld the longitudinal section, and weld the support plate inside the transverse section;

[0017] S5. Splice the transverse sections and the supporting towers in sequence until the construction of the steel suspension beam is completed;

[0018] S6. Lift the beam so that all safety platforms are away from the steel suspension beam.

[0019] The beneficial effects of the present invention are:

[0020] The present invention divides the steel suspension beam into several sections, which are then installed by hoisting and auxiliary support, with longitudinal sectioning as the main and transverse sectioning as the auxiliary, so that the influence of the steel suspension beam on the structural stress is minimized. This segmentation form can meet the requirements of hoisting performance on the one hand, and on the other hand, the lower structure can be partially used as a temporary support basis to achieve the purpose of stable construction.

[0021] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0023] Figure 1 This is a schematic diagram of the cantilever beam structure of an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the splicing of the box connecting sections according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of cantilever beam construction according to an embodiment of the present invention;

[0026] Figure 4 for Figure 3 A magnified schematic diagram of point A;

[0027] Figure 5 This is a schematic diagram of the interior of a transverse section of an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the safety unit of an embodiment of the present invention;

[0029] The markings in the attached drawings are as follows: 1. core column; 2. cantilever beam; 21. box connecting section; 211. half block; 212. top plate; 22. transverse section; 221. longitudinal section; 222. manhole; 223. support plate; 3. tower; 4. safety part; 41. cross beam; 42. safety platform; 421. bottom plate; 422. vertical rod; 4221. vertical groove; 423. ring frame; 424. guardrail; 425. sliding pin; 43. steel rope. DETAILED DESCRIPTION

[0030] like Figure 1 to Figure 6 As shown, the present invention discloses a large-span cantilever beam structure and a construction process, such as Figure 1 and Figure 3 As shown, it includes a core column 1 and a cantilever beam 2. The core column 1 is installed first, and the cantilever beam 2 is tightly constructed by means of segmented lifting + temporary support. The cantilever beam 2 includes a box connecting section 21 arranged on the top of the core column 1. The box connecting section 21 is initially installed with the installed core column 1. Both ends of the box connecting section 21 extend to connect a number of transverse sections 22 spliced ​​end to end. The transverse section 22 includes two longitudinal sections 221 spliced ​​side by side, that is, the suspended steel cantilever beam part is installed in a manner of mainly longitudinal sections and supplemented by transverse sections.

[0031] This steel cantilever beam structure is divided into several sections, which are then installed by hoisting and auxiliary support. The sections are mainly divided into longitudinal sections and supplemented by transverse sections, so that the influence of the steel cantilever beam on the structural force is minimized. This segmentation form can meet the requirements of hoisting performance on the one hand, and on the other hand, the lower structure can be partially used as a temporary support basis to achieve the purpose of stable construction.

[0032] In a further solution, Figure 2 As shown, the box connecting section 21 includes two transversely spliced ​​half blocks 211, the half blocks 211 are spliced ​​around the outside of the top end of the core column 1, and also includes a top plate 212, and the top plate 212 is connected to the half blocks 211 through a plurality of stiffening plates.

[0033] This arrangement of the box connecting section 21 divides the box connecting section 21 into two halves 211, so that the box connecting section 21 can be spliced ​​from both sides of the core column 1 respectively. This installation structure can adjust the docking accuracy, and the difficulty of side docking is less than that of top docking, which is conducive to the subsequent installation control of the cantilever end steel beam.

[0034] In a further solution, Figure 3 As shown, it also includes a tower 3 fixed to the ground, and the tower 3 is supported on the bottom surface of one end of each of the longitudinal segments 221.

[0035] Through the support of a plurality of tower frames 3, a plurality of segmented structures that have been hoisted but not yet spliced ​​are supported to facilitate subsequent connection.

[0036] In a further solution, Figure 5 As shown, the interior of the longitudinal section 221 is hollow, and two longitudinal sections 221 connected side by side are interconnected. A plurality of manholes 222 are provided on the top of the transverse section 22 for construction workers to enter the interior of the transverse section 22, and a plurality of support plates 223 are welded inside the transverse section 22.

[0037] By providing the manhole 222, it is convenient for construction workers to enter the interior of the transverse section 22 for construction. The support plate 223 is welded in place, and the manhole 222 is opened at the top edge of the transversely spliced ​​longitudinal section 221 to form a square hole structure located on the top surface of the longitudinal section 221. The square structure is relatively simple to cut, and therefore serves as the main embodiment of this invention.

[0038] In a further solution, Figure 3 , Figure 4 and Figure 6As shown, it also includes a safety part 4, which includes a crossbeam 41 additionally suspended by a crane. The crane is additionally provided for suspending the crossbeam 41, and suspending a plurality of safety platforms 42 along the crossbeam 41. The safety platform 42 includes a block-shaped bottom plate 421, and a plurality of vertical rods 422 extend upward from the four corners of the bottom plate 421. The vertical rods 422 are angle steel structures. A circle of square frame-shaped ring frames 423 are fixedly connected to the upper ends of the vertical rods 422. The ring frame 423 is connected to the crossbeam 41 through steel ropes 43. The vertical rods 422 are respectively against the four corners of the manhole 222. The safety platform 42 is extended into the manhole 222 by the crane, and the bottom plate 421 falls on the inner bottom surface of the transverse section 22.

[0039] This safety part 4 is used for hanging and entering the manhole 222 for construction. The frame structure connected by the vertical rod 422 does not affect the entry and exit of construction personnel. It is arranged at the position of the manhole 222. When extreme situations such as damage or falling of the steel suspension occur, the construction personnel can enter the safety part 4 and stand on the bottom plate 421. When the segmented structure falls, the safety part 4 is suspended by the crane and moved out along the manhole 222. This safety part 4 is used to avoid safety hazards in extreme environments, and can also be used as a support device for construction personnel when entering and exiting the manhole 222 to avoid casualties in extreme situations.

[0040] In a further solution, Figure 4 and Figure 6 As shown, it also includes a guardrail 424, which is a frame-shaped structure, and two mutually perpendicular sliding pins 425 extend from the four corners of the guardrail 424 respectively. A vertical groove 4221 is provided on the vertical rod 422, and the sliding pin 425 is slidably arranged in the vertical groove 4221. The bottom end of the vertical groove 4221 is located in the middle section of the vertical rod 422, so that when the sliding pin 425 is located at the bottom end of the vertical groove 4221, the guardrail 424 is blocked in the middle section of the vertical rod 422. After the safety platform 42 extends into the manhole 222, the sliding pin 425 is blocked by the edge of the manhole 222, so that the guardrail 424 is located on the top surface of the transverse section 22.

[0041] The guardrail 424 structure is located on the top surface of the horizontal section 22 after the safety part 4 enters the manhole 222, and does not affect the entry and exit of construction personnel. When the safety part 4 moves out of the manhole 222, the sliding pin 425 loses the support of the edge of the manhole 222, slides down along the vertical groove 4221, and moves to the middle section of the vertical rod 422, so that the personnel standing on the bottom plate 421 can hold the guardrail 424.

[0042] In a further solution, a vertical rod 422 for holding is extended upward from the middle of the bottom plate 421. The vertical rod 422 is still used for construction workers to hold. When the construction workers quickly retreat into the safety part 4, the vertical rod 422 can assist the construction workers in gaining strength.

[0043] The present invention also provides a construction process for a large-span cantilever beam 2, which adopts the large-span cantilever beam structure described above, and the steps are as follows:

[0044] S1, install the box connecting section 21, first connect one half block 211 with the top plate 212 through the stiffening plate, and splice the left and right sides of the two half blocks 211 on the top of the core column 1 by hanging;

[0045] S2, installing the transverse section 22, dividing the transverse section 22 into mutually spliced ​​longitudinal sections 221, splicing the two longitudinal sections 221 on the sides of the box connecting section 21 by suspending, and supporting the bottom side of the outer end of the longitudinal section 221 by the tower 3;

[0046] S3. A manhole 222 is opened in the middle of the top surface of the transverse section 22. The crossbeam 41 is suspended above the transverse section 22 being spliced, and the safety platform 42 is extended into the manhole 222, so that the bottom plate 421 of the safety platform 42 falls on the bottom surface of the transverse section 22, and the guardrail 424 is placed on the top surface of the transverse section 22;

[0047] S4. Construction personnel enter the manhole 222 through the safety platform 42, and perform connection work inside the transverse section 22, connect and weld the transverse section 22 to the box connecting section 21, splice and weld the longitudinal section 221, and support and weld the support plate 223 inside the transverse section 22;

[0048] S5, sequentially splicing the transverse section 22 and the supporting tower 3 until the construction of the steel suspension beam is completed;

[0049] S6. Lift the cross beam 41 to make all safety platforms 42 leave the steel suspension beam.

[0050] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A long-span cantilever beam structure, characterized in that: The invention comprises a core column (1) and a cantilever beam (2), wherein the cantilever beam (2) comprises a box connecting section (21) arranged on the top of the core column (1), wherein the two ends of the box connecting section (21) extend to connect a plurality of transverse sections (22) spliced ​​end to end, wherein the transverse section (22) comprises two longitudinal sections (221) spliced ​​side by side; the longitudinal section (221) is hollow inside, and the two longitudinal sections (221) connected side by side are interconnected; and the top of the transverse section (22) is provided with a plurality of holes for construction. A manhole (222) is provided inside the transverse section (22) for personnel to enter, and a plurality of support plates (223) are welded inside the transverse section (22); the safety section (4) also includes a crossbeam (41) additionally suspended by a crane, and a plurality of safety platforms (42) are suspended along the crossbeam (41). The safety platform (42) includes a bottom plate (421), and a plurality of vertical rods (422) extend upward from the edge of the bottom plate (421). The upper ends of the vertical rods (422) are fixedly connected to the bottom plate (421). A ring frame (423) is provided, wherein the ring frame (423) is connected to the crossbeam (41) through a steel rope (43), the vertical rods (422) are respectively against the inner side surfaces of the manholes (222), the safety platform (42) extends into the manhole (222), and the bottom plate (421) falls on the inner bottom surface of the transverse section (22); and a guardrail (424) is also provided, wherein the guardrail (424) is fixedly connected to a plurality of sliding pins (425), and a vertical groove (4221) is provided on the vertical rod (422). ), the sliding pin (425) is slidably arranged in the vertical groove (4221), and the bottom end of the vertical groove (4221) is located at the middle section of the vertical rod (422), so that when the sliding pin (425) is located at the bottom end of the vertical groove (4221), the guardrail (424) is blocked in the middle section of the vertical rod (422), and after the safety platform (42) extends into the manhole (222), the sliding pin (425) is blocked by the edge of the manhole (222), so that the guardrail (424) is located on the top surface of the transverse section (22).

2. The long-span cantilever beam structure according to claim 1 is characterized in that: The box body connecting section (21) comprises two transversely spliced ​​half-pieces (211), wherein the half-pieces (211) are spliced ​​around the outside of the top end of the core column (1), and further comprises a top plate (212), wherein the top plate (212) is respectively connected to the half-pieces (211) via a plurality of stiffening plates.

3. The long-span cantilever beam structure according to claim 2 is characterized in that: It also includes a tower frame (3) fixed to the ground, wherein the tower frame (3) is supported on the bottom surface of one end of each of the longitudinal segments (221).

4. The long-span cantilever beam structure according to claim 3 is characterized in that: A vertical rod (422) for holding is provided extending upward from the middle of the bottom plate (421).

5. A long-span cantilever beam construction process, using a long-span cantilever beam structure as claimed in claim 4, the steps of which are as follows: S1, installing the box connecting section (21), first connecting one of the half blocks (211) to the top plate (212) through a stiffening plate, and splicing the left and right sides of the two half blocks (211) to the top of the core column (1) by hanging; S2, installing the transverse section (22), dividing the transverse section (22) into longitudinal sections (221) that are spliced ​​to each other, splicing the two longitudinal sections (221) to the sides of the box connecting section (21) by means of suspension, and supporting the tower (3) on the bottom side of the outer end of the longitudinal section (221); S3, a manhole (222) is opened in the middle of the top surface of the transverse section (22), a crossbeam (41) is suspended above the transverse section (22) being spliced, and a safety platform (42) is extended into the manhole (222), so that the bottom plate (421) of the safety platform (42) falls on the inner bottom surface of the transverse section (22), and the guardrail (424) is blocked on the top surface of the transverse section (22); S4, the construction personnel enter the manhole (222) through the safety platform (42), and perform connection work inside the transverse section (22), connect and weld the transverse section (22) and the box connecting section (21), splice and weld the longitudinal section (221), and support and weld the support plate (223) inside the transverse section (22); S5, sequentially splicing the transverse section (22) and the supporting tower (3) until the construction of the steel suspension beam is completed; S6. Lift the cross beam (41) so that all safety platforms (42) are away from the steel suspension beam.

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