Self-fireproof cross-layer steel truss structure
By setting up a concrete isolation structure at the connection of the cross-layer steel trusses to isolate heat transfer, the structural damage caused by the fire connection is solved, and the stability and strength of the structure are improved.
Patent Information
- Application Number
- CN202420275726.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-02
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-02-02
AI Technical Summary
When a cross-layer steel truss occurs, the structure is easily damaged and collapsed due to the combined action of the upper and lower fires.
A self-fire-proof cross-layer steel truss structure is designed. By setting up a concrete isolation structure at the connection between the connecting member and the lower layer component, heat transfer is isolated, fire joint action is avoided, and the connection is restricted and supported through the cured concrete structure.
It effectively avoids the combined effect of fire, reduces the risk of structural damage, improves the stability and strength of the structure, extends the service life and reduces the loss of life and property.
Smart Images
Figure CN222632501U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cross-layer truss structures, in particular to a self-fireproof cross-layer steel truss structure. Background Art
[0002] Cross-layer steel trusses are key structural components of high-rise buildings. They need to have good ability to bear vertical loads and resist horizontal loads. According to the actual application environment, they need to have high structural strength and seismic resistance.
[0003] In the event of a fire, the cross-layer steel truss will not only be affected by the fire on the same layer, but also by the combined effects of the fire on the upper and lower layers, which may lead to the overall destruction of the truss, structural collapse and serious losses. Therefore, taking effective fire prevention measures is crucial to the structural safety of cross-layer steel trusses. Effective fire prevention measures can reduce or avoid collapse and damage in fires, extend service life and reduce loss of life and property. Utility Model Content
[0004] The technical problem that the utility model is to solve or at least partially solve is that in the related art, when a fire occurs in a cross-layer steel truss, the fires in the upper and lower layers are likely to produce a combined effect, causing damage to the cross-layer steel truss.
[0005] The utility model provides a self-fireproof cross-layer steel truss structure, comprising:
[0006] An upper layer component, a connecting member and a lower layer component, wherein the connecting member is arranged between the upper layer component and the lower layer component, and the upper layer component, the connecting member and the lower layer component jointly form a cross-layer channel;
[0007] The upper assembly includes an upper chord and an upper floor plate that are fixedly connected, and the lower assembly includes a lower chord and a lower floor plate that are fixedly connected, the upper end side of the connecting member is connected to the upper chord, and the lower end side of the connecting member is connected to the lower chord, and the upper floor plate and the lower floor plate are arranged at intervals;
[0008] The connection between the connection member and the lower component is covered with an isolation structure, and the isolation structure is set as a concrete structure.
[0009] Optionally, the connecting member includes a first web bar and a second web bar; the upper end side of any web bar is connected to the upper layer component, and the lower end side of any web bar is connected to the isolation structure.
[0010] Optionally, the first web member and the second web member are arranged in a V-shaped structure; and / or
[0011] The connection between any web member and the connection nodes of the upper chord member and the lower chord member is arranged to be welded, bolted or riveted.
[0012] Optionally, the connecting member further includes lateral rods, and four lateral rods are provided, and upper ends and lower ends of the four lateral rods are respectively fixedly connected to the end of the upper chord rod and the end of the lower chord rod.
[0013] Optionally, two upper chords and two lower chords are provided respectively, the upper floor is fixedly connected between the two upper chords, and the lower floor is fixedly connected between the two lower chords.
[0014] Optionally, the upper chord and the lower chord are both configured as I-beam structures, and the outer side of any chord is coated with a concrete layer.
[0015] Optionally, a steel cage formed by a plurality of longitudinal steel bars and transverse stirrups is arranged in any chord.
[0016] Optionally, the upper floor slab and the lower floor slab are arranged in parallel, the connecting members are symmetrically arranged on both sides of the cross-layer passage, and the isolation structures are symmetrically arranged on both sides of the cross-layer passage.
[0017] Optionally, a plurality of isolation structures are arranged at intervals along the extension direction of the cross-layer channel.
[0018] Optionally, the isolation structure is configured as a stepped structure protruding from the lower component, and the height of any step is 430 mm.
[0019] The technical solution provided by the utility model has the following advantages:
[0020] The self-fireproof cross-layer steel truss structure provided by the utility model is configured such that an isolation structure is set at the connection between the connecting member and the lower component, and the isolation structure is set as a concrete structure to isolate the heat transfer between the connecting member and the lower component, so as to avoid the combined effect of the fires in the upper and lower layers and damage to the structure when a fire occurs. At the same time, the connection between the connecting member and the lower component is limited and supported by the cured concrete structure, which is beneficial to enhancing the stability of the structure and ensuring the structural strength. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0022] Figure 1 A three-dimensional schematic diagram of the self-fireproof cross-layer steel truss structure provided by the utility model;
[0023] Figure 2 A partial structural schematic diagram of the main view of the self-fireproof cross-layer steel truss structure provided by the utility model;
[0024] Figure 3 A cross-sectional view of the self-fireproof cross-layer steel truss structure provided by the utility model;
[0025] Figure 4 A partial schematic diagram of the self-fireproof cross-layer steel truss structure provided by the utility model;
[0026] Description of reference numerals:
[0027] 11-upper chord; 12-upper floor slab;
[0028] 2-connecting member; 21 first web member; 22-second web member; 23-lateral rod;
[0029] 31-lower chord; 32-lower floor slab;
[0030] 4-Isolation structure;
[0031] 51-longitudinal reinforcement; 52-transverse stirrups. DETAILED DESCRIPTION
[0032] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "connected", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0036] Example
[0037] This embodiment provides a self-fireproof cross-layer steel truss structure. Figures 1 to 4 , including an upper component, a connecting member 2 and a lower component, the connecting member 2 is arranged between the upper component and the lower component, and the upper component, the connecting member 2 and the lower component jointly form a cross-layer channel.
[0038] join Figure 1 The upper component includes an upper chord 11 and an upper floor 12 fixedly connected to each other, and the lower component includes a lower chord 31 and a lower floor 32 fixedly connected to each other. The upper end side of the connecting member 2 is connected to the upper chord 11, and the lower end side of the connecting member 2 is connected to the lower chord 31. The upper floor 12 and the lower floor 32 are arranged at intervals.
[0039] join Figure 1 , Figure 2 as well as Figure 4 The connection between the connecting member 2 and the lower component is covered with an isolation structure 4, and the isolation structure 4 is set as a concrete structure.
[0040] The self-fireproof cross-layer steel truss structure provided in this embodiment is configured such that an isolation structure 4 is set at the connection between the connecting member 2 and the lower component, and the isolation structure 4 is set as a concrete structure to isolate the heat transfer between the connecting member 2 and the lower component, so as to avoid the combined effect of the fires in the upper and lower layers in the event of a fire, thereby causing damage to the structure. At the same time, the connection between the connecting member 2 and the lower component is limited and supported by the cured concrete structure, which is beneficial to enhancing the stability of the structure and ensuring the structural strength.
[0041] In this embodiment, participating Figure 1 There are two upper chord rods 11 and two lower chord rods 31 respectively, the upper floor 12 is fixedly connected between the two upper chord rods 11, and the lower floor 32 is fixedly connected between the two lower chord rods 31.
[0042] In some embodiments, participating Figure 3 The upper chord 11 and the lower chord 31 are both configured as I-beam structures, and a concrete layer is coated on the outside of any chord. In a specific implementation, the I-beam is a component of the steel structure wrapped with concrete, so that two upper chords 11 are combined with an upper floor slab 12 to form an upper assembly, and two lower chords 31 are combined with a lower floor slab 32 to form upper and lower assemblies. The I-beam structure can be made of Q235, Q345 and Q390 steel, and the concrete wrapped around the I-beam structure is C20-C30 concrete.
[0043] Furthermore, participate Figure 3 A steel cage formed by a plurality of longitudinal steel bars 51 and transverse stirrups 52 is arranged in any chord. The transverse stirrups 52 are arranged as a frame structure, which is sleeved and fastened to the outside of the plurality of longitudinal steel bars 51. This arrangement is conducive to the curing and forming of the outer concrete of the upper chord 11 and the lower chord 31, so as to have a stronger structural strength. Among them, the longitudinal steel bars 51 are HRB335 grade or HRB400 grade hot-rolled steel bars.
[0044] In the self-fireproof cross-layer steel truss structure provided in this embodiment, the upper chord 11 and the lower chord 31 respectively improve the stability of the steel truss nodes through the outer concrete and the isolation structure 4. When the structure adopts a welding connection method, when welding cracks are prone to occur at the nodes, the outer concrete and the isolation structure 4 of the upper chord 11 and the lower chord 31 play a certain protective role on the steel truss.
[0045] In this embodiment, the concrete covering the upper chord 11 and the lower chord 31 has a good wrapping effect on the internal steel structure components, thereby improving the stability of the structure.
[0046] The concrete wrapped around the upper chord 11 and the lower chord 31 makes the upper chord 11, the upper floor 12, the lower chord 31 and the lower floor 32 form a whole, which effectively solves the problem of cracks between the upper chord 11 and the lower chord 31 of the steel truss and the concrete floor due to the different elastic moduli of the materials of the steel structure components and the concrete materials, which makes the materials easy to deform and crack.
[0047] The self-fireproof cross-layer steel truss structure provided in this embodiment uses concrete pouring on the outside of the upper chord 11 and the lower chord 31 for fire protection. Since concrete has a very low thermal conductivity and a large heat capacity, its strength loss rate is much lower than that of steel. In the event of a fire, the outer concrete has a certain heat absorption, insulation and fire source isolation effect, which can block or slow down the high temperature of the fire from being transferred to the interior of the structural member, thereby delaying the temperature rise of the steel and improving its bearing capacity. Compared with the method of spraying fire retardant coating on the surface of the structure, the concrete coating method reduces the number of regular maintenance times, reduces some of the uncertainties caused by spraying fire retardant coating, and reduces the cost of later re-coating.
[0048] Since the steel structure components are protected by concrete on the outside, their corrosion resistance is significantly improved compared to the steel structure itself. Therefore, pouring concrete on the outside of the upper chord 11 and the lower chord 31 can achieve good corrosion resistance.
[0049] join Figure 2 and Figure 4 The connecting member 2 includes a first web member 21 and a second web member 22; the upper end side of any web member is connected to the upper layer assembly, and the lower end side of any web member is connected to the isolation structure 4. Any web member is made of I-beam.
[0050] The connection between any web member and the connection nodes of the upper chord member 11 and the lower chord member 31 is arranged to be welded, bolted or riveted.
[0051] In some embodiments, participating Figure 1 The connecting member 2 further includes lateral rods 23, and four lateral rods 23 are provided. The upper end side and the lower end side of the four lateral rods 23 are respectively fixedly connected to the end of the upper chord rod 11 and the end of the lower chord rod 31. The end of the upper chord rod 11 and the end of the lower chord rod 31 are connected by the lateral rods 23 to strengthen the connection strength of the overall structure. The lateral rods 23 can be made of steel components.
[0052] In this embodiment, participating Figure 1 The upper floor 12 and the lower floor 32 are arranged in parallel, the connecting members 2 are symmetrically arranged on both sides of the cross-layer channel, and the isolation structure 4 is symmetrically arranged on both sides of the cross-layer channel. The isolation structure 4 is placed on the plane where the top surface of the lower component is located, specifically on the plane where the top surface of the lower chord 31 is located.
[0053] In some embodiments, participating Figure 1 and Figure 2 , a plurality of isolation structures 4 are arranged at intervals along the extension direction of the cross-layer passage. The first web member 21 and the second web member 22 are arranged in a V-shaped structure. Among them, the isolation structure 4 wraps around the tip portion formed by the first web member 21 and the second web member 22. The acute angle formed by the extension direction of the first web member 21 and the extension direction of the upper chord member 11 in a direction perpendicular to the extension of the upper floor slab 12 is set to 60°, and the acute angle formed by the extension direction of the second web member 22 and the extension direction of the upper chord member 11 in a direction perpendicular to the extension of the upper floor slab 12 is set to 60°.
[0054] In some embodiments, the isolation structure 4 is configured as a stepped structure protruding from the lower component. Specifically, the stepped structure is configured as a two-step ladder, the front view thereof is in the shape of a "convex" character, and the top view thereof is in the shape of a "straight" character. Considering the comfort of a sitting posture of a human body, the height of each step is configured as 430 mm, wherein a steel bar is configured inside the stepped structure.
[0055] The stepped concrete can be used as a public seat for pedestrians to rest, which not only plays a role in fire prevention but also has certain architectural functions. The height of the stepped concrete structure fully considers the comfort of the seat, so that the height of each step is close to the height of the human knee, avoiding sitting fatigue caused by the seat being too high or too low.
[0056] The self-fireproofing cross-layer steel truss structure provided in this embodiment has the lower ends of the first web member 21 and the second web member 22 in the connecting member 2 respectively wrapped in the isolation structure 4. Due to the effect of the stepped concrete structure, the fire source is isolated at a position far away from any web member vertically, thereby achieving the fire isolation and fire prevention effect of the connecting member 2.
[0057] The manufacturing process of the self-fireproof cross-layer steel truss structure provided in this embodiment is as follows: first, an isolation structure 4 is manufactured according to the design drawings, and holes for inserting the first web member 21 and the second web member 22 are reserved, and they are installed layer by layer from bottom to top. Then, concrete is poured on the outside of the upper chord 11 and the lower chord 31, and longitudinal steel bars 51 and transverse stirrups 52 are inserted. The mechanical bite force, chemical bonding force, and friction force of the longitudinal steel bars 51 and the concrete wrapped around the upper chord 11 and the lower chord 31 are utilized to apply a tensioning constraint to the wrapped concrete to suppress its lateral deformation, and the wrapped concrete serves to insulate and isolate the steel structure components inside from fire sources. Among them, the steel truss can be installed in sections on a flat ground first, and then the sections of the truss are assembled into a whole.
[0058] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.
Claims
1. A self-fireproof cross-layer steel truss structure, characterized in that: include: An upper layer component, a connecting member (2) and a lower layer component, wherein the connecting member (2) is arranged between the upper layer component and the lower layer component, and the upper layer component, the connecting member (2) and the lower layer component jointly form a cross-layer channel; The upper layer assembly comprises an upper chord (11) and an upper floor (12) which are fixedly connected to each other, and the lower layer assembly comprises a lower chord (31) and a lower floor (32) which are fixedly connected to each other, the upper end side of the connecting member (2) is connected to the upper chord (11), and the lower end side of the connecting member (2) is connected to the lower chord (31), and the upper floor (12) and the lower floor (32) are arranged at intervals; The connection between the connecting member (2) and the lower layer component is covered with an isolation structure (4), and the isolation structure (4) is configured as a concrete structure.
2. The self-fireproof cross-layer steel truss structure according to claim 1 is characterized in that: The connecting member (2) comprises a first web member (21) and a second web member (22); the upper end side of any web member is connected to the upper layer component, and the lower end side of any web member is connected to the isolation structure (4).
3. The self-fireproof cross-layer steel truss structure according to claim 2 is characterized in that: The first web member (21) and the second web member (22) are arranged in a V-shaped structure; and / or The connection between any web member and the connection node with the upper chord member (11) and the lower chord member (31) is arranged to be welded, bolted or riveted.
4. The self-fireproof cross-layer steel truss structure according to claim 2 is characterized in that: The connecting member (2) further comprises lateral rods (23), four of which are provided, and the upper ends and lower ends of the four lateral rods (23) are respectively fixedly connected to the end of the upper chord rod (11) and the end of the lower chord rod (31).
5. The self-fireproof cross-layer steel truss structure according to claim 1 is characterized in that: Two upper chords (11) and two lower chords (31) are respectively provided, the upper floor plate (12) is fixedly connected between the two upper chords (11), and the lower floor plate (32) is fixedly connected between the two lower chords (31).
6. The self-fireproof cross-layer steel truss structure according to claim 5 is characterized in that: The upper chord (11) and the lower chord (31) are both configured as I-beam structures, and the outer side of any chord is coated with a concrete layer.
7. The self-fireproof cross-layer steel truss structure according to claim 6 is characterized in that: A steel cage formed by a plurality of longitudinal steel bars (51) and transverse stirrups (52) is arranged in any chord.
8. The self-fireproof cross-layer steel truss structure according to claim 1 is characterized in that: The upper floor slab (12) and the lower floor slab (32) are arranged in parallel, the connecting components (2) are symmetrically arranged on both sides of the cross-floor passage, and the isolation structure (4) is symmetrically arranged on both sides of the cross-floor passage.
9. The self-fireproof cross-layer steel truss structure according to any one of claims 1 to 8, characterized in that: A plurality of isolation structures (4) are arranged at intervals along the extension direction of the cross-layer channel.
10. The self-fireproof cross-layer steel truss structure according to claim 9 is characterized in that: The isolation structure (4) is arranged as a stepped structure protruding from the lower component, and the height of any step is 430 mm.