CN117868303A - Fireproof structure with built-in inhaul cable steel truss hanging structure - Google Patents
Fireproof structure with built-in inhaul cable steel truss hanging structure Download PDFInfo
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- CN117868303A CN117868303A CN202410140402.5A CN202410140402A CN117868303A CN 117868303 A CN117868303 A CN 117868303A CN 202410140402 A CN202410140402 A CN 202410140402A CN 117868303 A CN117868303 A CN 117868303A
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- fireproof
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- truss
- fire protection
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 151
- 239000010959 steel Substances 0.000 title claims abstract description 151
- 239000000463 material Substances 0.000 claims abstract description 87
- 239000002184 metal Substances 0.000 claims description 32
- 238000004873 anchoring Methods 0.000 claims description 19
- 239000000725 suspension Substances 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Abstract
The invention discloses a fireproof structure of a built-in inhaul cable steel truss hanging structure, wherein a prestress inhaul cable is arranged in an inner cavity communicated with a steel truss vertical rod and a lower hanging steel column, which are positioned at the midspan position of a steel truss, a steel sleeve is sleeved outside the prestress inhaul cable, a first fireproof structure is arranged between the steel sleeve and the steel truss vertical rod and between the steel sleeve and the lower hanging steel column inner cavity, the first fireproof structure at least comprises first fireproof materials arranged on the periphery of the steel sleeve, the first fireproof materials are provided with at least two sections, the two sections of the first fireproof materials can be separated, and the two sections of the first fireproof materials are mutually overlapped to form an overlap joint section. Compared with the prior art, when the fire disaster occurs, when the failure of part of structural members can cause the large deformation and elongation of the prestressed inhaul cable, the two sections of first fireproof materials synchronously deform and keep lap joint, a sealing and wrapping effect is provided for the prestressed inhaul cable, the effective fireproof protection is provided for the key members, the fireproof limit of the key members is prolonged, and the safety redundancy of collapse resistance of the steel truss hanging structure is improved.
Description
Technical Field
The invention relates to a building structure, in particular to a fireproof structure of a built-in inhaul cable steel truss hanging structure for a large-span steel truss hanging structure in the building structure.
Background
In commercial and exhibitions type buildings, there is often a need to provide hollow areas of open high space in the middle of each floor plan for increased indoor permeability and interactivity. Meanwhile, for enriching the diversity of indoor space layout, a plurality of air corridors are arranged on the middle-upper floor of the hollow area to form a large-span connecting channel, so that the possibility of enriching traffic flow lines of each layer and adapting to flexible arrangement of different scenes is achieved. The structural system layer is constructed, a steel truss is arranged on the top layer of the corridor and a plurality of floors are hung downwards (namely, a plurality of floors below the steel truss are hung below a steel column through a lower hanging steel column), the steel truss is hung below the steel truss, and the steel truss belongs to a common description in the field of the art, so that a definite primary and secondary structural form is formed, and the requirement on a plurality of floors of the bottom of the corridor for a large space is met. In another application scene, a high-level conjoined structure is arranged between two towers, a steel truss is arranged on the floor at the top, and a plurality of floors are hung downwards to build a conjoined structure system. The structural system has small influence on the rigidity of the main structure, and no diagonal rod is arranged in the lower hanging floor layer, so that a non-shielding building vision space can be provided, and the structural system is practically applied to actual engineering projects gradually. However, if the local area of the steel truss hanging structure is in fire disaster, based on the prior art, the fire resistance of all steel trusses and vertical rods of the lower hanging floor required by conventional design and construction is balanced, so that the requirements of national fire protection standards can be met, but extra fire protection safety reserves are lacked, and when the fire disaster working condition occurs, the steel truss part rods or the lower hanging floor part steel members can be possibly caused to fail based on the special stress characteristics of the hanging structure system, so that the possibility of continuous collapse risk is greatly improved. The general Specification of engineering structures (GB 55001-2021) shows that the structure should be capable of maintaining the bearing capacity and the overall stability in a specified time, and how to improve the structure to provide an additional fireproof protection stress mechanism on the basis of the practical application of the prior art becomes the subject of urgent research.
Disclosure of Invention
The invention aims to provide a fireproof structure of a built-in inhaul cable steel truss hanging structure, and aims to solve the technical problem of improving fireproof capacity and safety redundancy of the fireproof structure.
In order to solve the problems, the invention adopts the following technical scheme: the fireproof structure comprises a steel truss, a lower hanging floor steel girder and a bottom floor steel girder, wherein a steel truss vertical rod positioned at the midspan position on the steel truss and a prestressed cable penetrating through the steel truss vertical rod and the lower hanging steel column are arranged in an inner cavity communicated with each other, and the upper end of the prestressed cable is fixedly connected with the upper flange of the steel truss through a clamping piece anchoring system to form a tensioning end; the lower end of the prestress inhaul cable is fixedly connected with the floor steel beam at the bottom through a clamping piece anchoring system to form an anchoring end; the prestress inhaul cable is sleeved with a steel sleeve, a first fireproof structure is arranged between the steel sleeve and the inner cavity of the steel truss vertical rod and between the steel sleeve and the inner cavity of the lower hanging steel column, the first fireproof structure at least comprises a first fireproof material arranged on the periphery of the steel sleeve, the first fireproof material is provided with at least two sections, the two sections of the first fireproof material can be separated, and the two sections of the first fireproof material are mutually overlapped to form an overlapping section.
Further, the overlap length of the overlap section is greater than the axial limit tensile deformation value of the prestressed inhaul cable.
Further, the first fire protection structure further comprises a deformable second fire protection material disposed between the steel sleeve and the first fire protection material.
Further, the second fireproof material is made of flexible materials.
Further, a metal upper cover plate is arranged at the upper end of the vertical rod of the steel truss, a hole for a prestress cable to pass through is formed in the center of the metal upper cover plate, and the metal upper cover plate is fixed on the upper flange; the lower end of the lower hanging steel column is provided with a metal lower cover plate, the center of the metal lower cover plate is provided with a hole for the prestressed cable to pass through, and the metal lower cover plate is fixed on the steel girder of the bottom floor.
Further, a second fireproof structure is arranged outside the clamping piece anchoring system, and the second fireproof structure comprises a third fireproof material arranged outside the clamping piece anchoring system and a fourth fireproof material arranged outside the third fireproof material.
Further, an anchor protection cover is arranged outside the second fireproof structure.
Further, the third fireproof material is formed by splicing fireproof plates by adopting flexible fireproof materials and/or fourth fireproof materials.
Further, the first fireproof material is formed by splicing fireproof plates.
Further, the cross-sectional shape of the first fireproof material is circular or quadrangular.
Compared with the prior art, the prestress inhaul cable sleeved with the steel sleeve is arranged in the inner cavity where the steel truss vertical rod at the middle position of the steel truss is communicated with the lower hanging steel column, the first fireproof structure formed by at least the first fireproof material is arranged outside the steel sleeve, the first fireproof material is provided with at least two sections, the first fireproof materials between the two sections can be separated, and the two sections of the first fireproof materials are mutually overlapped to form an overlap joint section, so that when a part of structural members fail and cause the prestress inhaul cable to deform and stretch greatly, the two sections of the first fireproof materials synchronously deform and keep the overlap joint section, and a sealing and wrapping effect is continuously provided for the prestress inhaul cable, thereby providing effective fireproof protection for key members, prolonging the fireproof limit of the key members, and practically improving the safety redundancy of the steel truss hanging structure against collapse.
Drawings
Fig. 1 is an elevation view of an embodiment of the present invention.
Fig. 2 is a node diagram of node a in fig. 1.
Fig. 3 is a cross-sectional view taken along the direction C-C in fig. 2.
Fig. 4 is a cross-sectional view taken along the direction D-D in fig. 2.
Fig. 5 is a node diagram of the node B of fig. 1.
Fig. 6 is a sectional view of E-E in fig. 5.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
As shown in fig. 1, the invention discloses a fireproof structure of a built-in cable steel truss suspension structure, in the prior art, the steel truss suspension structure comprises a steel truss 12, a lower hanging floor steel beam 15 and a bottom floor steel beam 16, the steel truss 12 comprises an upper flange 8, a lower flange 14 and a diagonal web member 13, as can be seen from fig. 1, a steel truss vertical rod 9 and a lower hanging steel column 10 are arranged at the joint position of two adjacent diagonal web members 13, the lower hanging steel column 10 and the steel truss vertical rod 9 are closed cross sections, the joints of the two are welded in a sealing manner, the lower hanging steel column 10 is welded with the lower hanging floor steel beam 15 and the bottom floor steel beam 16 in a sealing manner, and the lower hanging steel column 10 is fixed with the lower hanging floor steel beam 16 in a welding manner or a bolting manner, which is not described in detail in the prior art, and the outer surface of the structure is coated with a fireproof coating conventionally.
As shown in fig. 1, the invention is improved in that a prestress cable 4 penetrating through the inner cavities of a steel truss vertical rod 9 and a lower hanging steel column 10 is arranged in the inner cavity communicated with the steel truss vertical rod 9 and the lower hanging steel column 10 at the midspan position of a steel truss 12, the upper end of the prestress cable 4 is fixedly connected with an upper flange 8 of the steel truss 12 through an existing clamping piece anchoring system 6 to form a tensioning end, and the lower end of the prestress cable 4 is fixedly connected with a bottom floor steel beam 16 through an existing clamping piece anchoring system 6 to form an anchoring end; as shown in fig. 2, fig. 5 and fig. 6, the steel sleeve 3 that the whole body set up is sleeved outside the prestressed cable 4, the inner aperture of the steel sleeve 3 is larger than that of the prestressed cable 4, a first fireproof structure is arranged between the steel sleeve 3 and the inner cavity of the steel truss vertical rod 9 and the inner cavity of the lower hanging steel column 10, the first fireproof structure comprises a deformable second fireproof material 2 and a first fireproof material 1 which are wrapped on the periphery of the steel sleeve 3 in a whole body manner, the first fireproof material 1 is arranged outside the second fireproof material 2, one end, close to the tensioning end, of the steel truss vertical rod 9 in the first fireproof material 1 is provided with two sections of structures, the first fireproof materials at the other parts can be arranged in a whole body manner, the two sections of first fireproof materials 1 can be separated, and the two sections of first fireproof materials 1 are mutually overlapped to form an overlap joint section, so that when a fire disaster occurs in a local area, the fireproof coating sprayed on the surface of a steel member can cause the steel truss 12 to be partially lost in protection (for example: the steel truss vertical rod 9, the diagonal web member 13 and the like) or the lower hanging floor part of the steel member fails, so that the internal force of the steel truss 12 is redistributed, meanwhile, the prestressed cable 4 at the midspan position can instantaneously generate vertical large deformation to be elongated, namely, the prestressed cable 4 synchronously and instantly starts an additional stress mechanism, the first fireproof material 1 and the second fireproof material 2 synchronously elongate, and the first fireproof material 1 and the second fireproof material 2 close to the stretching end adopt a separated lap joint structure and the second fireproof material 2 is a deformable fireproof material, so that the first fireproof material 1 and the second fireproof material 2 always provide effective sealing and wrapping for the prestressed cable 4, can continuously provide additional fireproof limit for the vertical rod piece of the steel truss hanging structure, effectively improve the continuous collapse resistance of the vertical rod piece, greatly prolongs the occurrence time of continuous collapse and finally plays a role in improving the safety redundancy of the whole structural system.
Preferably, as shown in FIG. 2, the overlap length L of the overlap section a The axial limit tensile deformation value larger than that of the prestressed cable 4 is further realized, so that the first fireproof material 1 can provide more effective sealing and wrapping for the prestressed cable 4.
The invention adds a local fireproof structure as another fireproof measure besides the existing fireproof coating, and constructs a fireproof system of the fireproof structure of the built-in inhaul cable steel truss hanging structure, thereby improving the fireproof limit of important stressed components, realizing continuous fireproof protection effect, and further improving the fireproof capacity and the safety redundancy of the steel truss hanging structure.
As shown in fig. 2 to 5, on the basis of the above structure, the upper end (tensioning end) of the steel truss vertical rod 9 is provided with a metal upper cover plate 7, the metal upper cover plate 7 is welded and fixed on the upper flange 8, the lower end (fixed end of the pre-stress cable) of the lower hanging steel column 10 is provided with a metal lower cover plate 11, the centers of the metal upper cover plate 7 and the metal lower cover plate 11 are respectively provided with a hole for the pre-stress cable 4 to pass through, the metal lower cover plate 11 is welded and fixed on the lower end of the lower hanging steel column 10, and two ends of the pre-stress cable 4 are respectively tensioned and fixed with the metal upper cover plate 7 and the metal lower cover plate 11 through the clamping piece anchor system 6.
The upper metal cover plate 7 and the lower metal cover plate 11 are made of high-temperature steel plates with high temperature resistance (600 ℃) or weldable steel plates with high temperature resistance.
As shown in fig. 2 and 5, a second fireproof structure is arranged outside the clip anchoring system 6, the second fireproof structure comprises a third fireproof material 17 arranged outside the clip anchoring system 6 and a fourth fireproof material 18 arranged outside the third fireproof material 17, an anchor protecting cover 5 is arranged outside the second fireproof structure so as to completely wrap the second fireproof structure and the clip anchoring system 6, thereby further protecting the clip anchoring system 6, the anchor protecting cover 5 is fixed on the metal upper cover plate 7 and the metal lower cover plate 11 in a welding mode, and the periphery of the anchor protecting cover 5 is fully welded.
In the present invention, the second fireproof material 2 and the third fireproof material 17 may be flexible fireproof materials, such as rock wool, and when rock wool is used, the thickness is not less than 50mm, the first fireproof material and the fourth fireproof material 18 are formed by splicing fireproof plates, such as baud plates or ALC fireproof plates, and the thickness is not less than 12mm, and the cross-sectional shape of the first fireproof material 1 and the fourth fireproof material 18 may be circular or quadrilateral, and the quadrilateral may be square, preferably square.
As shown in fig. 4 and 6, the second fireproof material 2 is tightly wrapped around the steel sleeve 3 and fills the gap between the first fireproof material 1 and the steel sleeve 3, and the third fireproof material 17 fills the gap between the fourth fireproof material 18 and the clip anchoring system 6.
In the invention, if the first fireproof material and the fourth fireproof material in the first fireproof structure and the second fireproof structure adopt fireproof plates, only the first fireproof material 1 and the second fireproof material 2 can be arranged in the first fireproof structure outside the steel sleeve 3; similarly, the second fire protection structure in the anchor boot 5 may be provided with only the fourth fire protection material 18, without the third fire protection material 17.
The construction steps of the invention are as follows:
1. carrying out construction drawing deep design on the steel truss 12 and the steel frame hung below the steel truss according to the construction drawing design requirement, reasonably determining the machining size and the positioning of a factory machining steel member unit, and carrying out steel member machining;
2. the steel members which are processed are assembled and welded in the factory, the rest steel members are processed in sections according to the installation requirement, in order to facilitate the construction of the fireproof material of the anchoring end, the connection nodes of the lower hanging steel column 10 and the bottom floor steel girder 16 are preferably assembled in sections, and the sections are the sections of the bottom floor steel girder 16 which are easy to weld and install the fireproof material;
3. and (3) conveying all kinds of steel members (the steel members comprise a steel truss 12, a lower hanging steel column 10, a lower hanging floor steel beam 15 and a bottom floor steel beam 16) processed by the factory to the site, hoisting the steel members into place after erecting the jig frame, sequentially completing the assembly of the steel truss 12, the lower hanging steel column 10, the lower hanging floor steel beam 15 and the bottom floor steel beam 16, and adopting welding and high-strength bolts to complete the site connection procedure.
4. Considering convenience of construction, the metal upper cover plate 7 of the steel truss 12 can be closed after the first and second fireproof structures are completed, and the metal lower cover plate 11 at the lower end of the lower hanging steel column 10 can be welded in factories. The material requirements of the upper metal cover plate 7 and the lower metal cover plate 11 are steel plates resistant to 600 ℃ or weldable high-temperature steel plates with other design requirements, and a hole penetrating through the prestressed cable 4 is reserved in the center of the upper metal cover plate 7 and the lower metal cover plate 11.
5. The outer side of the steel sleeve 3 is wrapped with a second fireproof material 2 with a certain thickness and a first fireproof material 1 is spliced according to design requirements, wherein the first fireproof material 1 is vertically provided with a lap joint section at one end of a steel truss vertical rod 9 close to a tensioning end, the specific part can be vertically adjustable along the steel sleeve 3 according to construction convenience (generally, the construction operation is easy to be carried out near the tensioning end), the first fireproof material 1 of the lap joint section is mutually overlapped by two sections and can freely move, the lap joint length La of the lap joint section is a calculation requirement, and a design principle that the length of the lap joint section is determined by adopting a tensile deformation value which is not smaller than the vertical limit of a prestress guy cable is adopted; the two sections of the 1 st fire-proof material 1 within the overlap length La are not fixed.
6. In the steel sleeve 3, the prestress cable 4 is penetrated through by the through height, two ends of the prestress cable 4 respectively penetrate out of holes of the metal upper cover plate 7 and the metal lower cover plate 11, a clamping piece anchorage system 6 is arranged at the top surface stretching end position of the upper flange 8, the clamping piece anchorage system 6 is arranged at the anchorage end position of the steel girder 16 at the bottom floor, then the prestress cable 4 is stretched, and when the design tensile stress value is reached, the fixation of the prestress cable is completed.
Based on the stress characteristics of a self structural system of the steel truss hanging structure, the invention provides the improved fireproof structure of the steel truss hanging structure under the fire working condition, which fully considers the requirement of fireproof measures on tightness and provides countermeasures in consideration of the condition that the prestress inhaul cable is greatly deformed and can be elongated, thereby improving the fireproof structure of the traditional steel truss hanging structure, ensuring that the structure has the advantages of definite double fireproof structure measures and clear construction working procedures, and being suitable for large-span air corridors and conjoined structures.
Claims (10)
1. The utility model provides a built-in cable steel truss suspended structure's fireproof structure, includes steel truss (12), hangs floor girder steel (15), bottom floor girder steel (16), its characterized in that down: at least a steel truss vertical rod (9) positioned at the midspan position on the steel truss (12) and a prestress cable (4) penetrating through the steel truss vertical rod (9) and the inner cavity of the lower hanging steel column (10) are arranged in the inner cavity communicated with the lower hanging steel column (10), and the upper end of the prestress cable (4) is fixedly connected with an upper flange (8) of the steel truss (12) through a clamping piece anchoring system (6) to form a tensioning end; the lower end of the prestress inhaul cable (4) is fixedly connected with the floor steel beam (16) at the bottom through a clamping piece anchoring system (6) to form an anchoring end; the prestress inhaul cable (4) is sleeved with a steel sleeve (3), a first fireproof structure is arranged between the steel sleeve (3) and the inner cavity of a steel truss vertical rod (9) and a lower hanging steel column (10), the first fireproof structure at least comprises a first fireproof material (1) arranged on the periphery of the steel sleeve (3), the first fireproof material (1) is provided with at least two sections, the two sections of the first fireproof material (1) are separable, and the two sections of the first fireproof material (1) are mutually overlapped to form an overlap joint section.
2. The fire protection structure for a built-in guy wire truss suspension structure of claim 1 wherein: the lap length of the lap section is larger than the axial limit tensile deformation value of the prestressed inhaul cable (4).
3. The fire protection structure for a built-in guy wire truss suspension structure of claim 1 wherein: the first fire protection structure further comprises a deformable second fire protection material (2) arranged between the steel sleeve (3) and the first fire protection material (1).
4. A fire protection structure for a built-in guy wire truss suspension structure of claim 3 wherein: the second fireproof material (2) is made of flexible materials.
5. The fire protection structure for a built-in guy wire truss suspension structure of claim 1 wherein: the upper end of the steel truss vertical rod (9) is provided with a metal upper cover plate (7), the center of the metal upper cover plate (7) is provided with a hole for the prestressed cable (4) to pass through, and the metal upper cover plate (7) is fixed on the upper flange (8); the lower end of the lower hanging steel column (10) is provided with a metal lower cover plate (11), the center of the metal lower cover plate (11) is provided with a hole for the prestressed cable (4) to pass through, and the metal lower cover plate (11) is fixed on the steel girder (16) of the bottom floor.
6. The fire protection structure for a built-in guy wire truss suspension structure of claim 5 wherein: the clamping piece anchoring system (6) is provided with a second fireproof structure, and the second fireproof structure comprises a third fireproof material (17) arranged outside the clamping piece anchoring system (6) and a fourth fireproof material (18) arranged outside the third fireproof material (17).
7. The fire protection structure for a built-in guy wire truss suspension structure of claim 6 wherein: an anchorage protection cover (5) is arranged outside the second fireproof structure.
8. The fire protection structure for a built-in guy wire truss suspension structure of claim 7 wherein: the third fireproof material (17) is formed by splicing fireproof plates by adopting flexible fireproof materials and/or fourth fireproof materials (18).
9. The fire protection structure for a built-in guy wire truss suspension structure of any one of claims 1-8, wherein: the first fireproof material (1) is formed by splicing fireproof plates.
10. The fire protection structure for a built-in guy wire truss suspension structure of claim 9 wherein: the cross-sectional shape of the first fireproof material (1) is round or quadrilateral.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410140402.5A CN117868303A (en) | 2024-01-31 | 2024-01-31 | Fireproof structure with built-in inhaul cable steel truss hanging structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410140402.5A CN117868303A (en) | 2024-01-31 | 2024-01-31 | Fireproof structure with built-in inhaul cable steel truss hanging structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117868303A true CN117868303A (en) | 2024-04-12 |
Family
ID=90581124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410140402.5A Pending CN117868303A (en) | 2024-01-31 | 2024-01-31 | Fireproof structure with built-in inhaul cable steel truss hanging structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117868303A (en) |
-
2024
- 2024-01-31 CN CN202410140402.5A patent/CN117868303A/en active Pending
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