Rigid joint for open-web truss

Abstract

The utility model relates to a rigid joint for an open-web truss. The rigid joint is used for connecting a vertical web member and a chord member in an open-web truss structure. The node comprises a reinforced concrete chord member, a steel-encased sleeve, a concrete-filled steel tube vertical web member and a reinforced concrete secondary beam, steel-encased jackets are pre-arranged at the joints of the reinforced concrete chord members, and the junctions of the concrete-filled steel tube vertical web members and the steel-encased jackets are subjected to full penetration groove welding; a stud is arranged on the inner wall of the steel-encased sleeve, a hole is reserved in a vertical web of the steel-encased sleeve, the reinforced concrete chord member can directly penetrate through a cavity in the steel-encased sleeve, a longitudinal bar in the secondary beam can penetrate through the reserved hole, and integrated connection is achieved through concrete grouted in the steel-encased sleeve through pressure. The connecting structure is safe and reliable in node connection, clear in force transmission path and convenient in site construction, and has engineering application value.

Description

Technical Field

[0001] The utility model relates to the technical field of building structures, in particular to a rigid node for a hollow truss. Background Art

[0002] In multi-story buildings, in order to obtain variable spaces and meet the effect of transparent building facades, some frame columns often cannot be put on the ground or columns are pulled out of some floors to form large spaces, resulting in large cantilever beams or large-span beams. According to conventional designs, the cross-sectional dimensions of large cantilever beams or large-span beams are generally large, which not only easily affects the indoor net height, but also has poor economic efficiency. For the above situation, multiple upper floors can be used to form a truss conversion layer. After the overall structure is subjected to force, it shows the force mode of the laminated hollow truss structure, giving full play to the role of space. In the above hollow truss structure system, the vertical web member shows the force characteristics of small axial pressure and large end bending moment. If hollow steel tubes or steel tube concrete are used, the force requirements can be met under the premise of controllable cross-section. At this time, the rigid connection between the steel tube concrete vertical web member and the reinforced concrete chord becomes the key to ensuring the safety of the structure. Therefore, it is necessary to design an optimized rigid connection structure to ensure the reliability of the rigid connection of the above hollow truss. Utility Model Content

[0003] Based on the above description, the utility model provides a rigid node for a hollow truss to solve the connection reliability problem of the rigid node in the hollow truss structure.

[0004] The utility model solves the above-mentioned technical problems with the following technical solutions: a rigid node for an open-web truss, comprising two vertical chords, vertical webs, secondary beams and an outer steel sleeve, wherein the chords and secondary beams are made of reinforced concrete, the outer steel sleeve is arranged at the node of the chord, the vertical webs and the outer steel sleeve are welded with full penetration, a hole penetrating the outer steel sleeve and the chord is arranged at the node, the secondary beam penetrates the outer steel sleeve through the hole and is integrally connected to the chord by concrete.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows.

[0006] Furthermore, the outer steel sleeve includes an outer web, an inner web, an upper flange plate and a lower flange plate, the outer web, the upper flange plate and the lower flange plate are arranged along the circumference of the chord to form a cylindrical space surrounding the chord, the upper flange plate and the lower flange plate are arranged one by one at the upper and lower ends of the cylindrical space and are fixedly connected to the outer web, and the upper flange plate and / or the lower flange plate are also connected to the vertical web; the inner web is vertically arranged along the length direction of the chord and fixedly connected to the inner side of the outer web, the inner web divides the cylindrical space into a plurality of sub-spaces, and the opening passes through the outer web and the inner web.

[0007] Furthermore, a plurality of first longitudinal reinforcements are provided in the chord, the first longitudinal reinforcements are arranged along the length direction of the chord, and the first longitudinal reinforcements penetrate the subspace in the cylindrical space; a plurality of second longitudinal reinforcements are provided in the secondary beam, the second longitudinal reinforcements are arranged along the length direction of the secondary beam, and the second longitudinal reinforcements penetrate the outer steel casing through the opening; and the outer steel casing is filled with concrete.

[0008] Furthermore, a plurality of bolts are fixedly provided on the inner side of the outer steel sleeve, and the plurality of bolts are embedded in the concrete of the chord and the secondary beam, and the first longitudinal reinforcement in the chord and the second longitudinal reinforcement in the secondary beam do not interfere with the bolts.

[0009] Furthermore, when the node is located at the bottom layer of the hollow truss, the vertical web member is an upper web member, and the upper web member is welded to the upper flange plate; when the node is located at the middle layer of the hollow truss, the vertical web member includes an upper web member and a lower web member, the upper web member is welded to the upper flange plate, and the lower web member is welded to the lower flange plate; when the node is located at the top layer of the hollow truss, the vertical web member is a lower web member, and the lower web member is welded to the lower flange plate.

[0010] Furthermore, the thickness of the outer web plate, the upper flange plate or the lower flange plate is not less than the thickness of the tube wall of the vertical web member.

[0011] Furthermore, the coaxial sleeve on the chord is provided with a plurality of additional stirrups, the additional stirrups are adjacent to the outer side of the end of the outer steel sleeve, and gaps are provided between adjacent additional stirrups.

[0012] Furthermore, the vertical web member is a hollow steel tube web member or a steel tube concrete web member, and the cross section of the vertical web member 3 is rectangular or circular.

[0013] Furthermore, the length of the outer steel sleeve along the length direction of the chord is not less than 3 times the length of the long side of the cross section of the vertical web member.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0015] The utility model provides a rigid node for a hollow truss, which can increase the node rigidity and ensure effective transmission of bending moment by presetting an outer steel sleeve on the reinforced concrete chord and directly welding the steel tube concrete vertical web with the outer steel sleeve on site with full penetration. At the same time, the first longitudinal reinforcement in the reinforced concrete chord can directly pass through the outer steel sleeve, which is convenient for construction and reliable in quality. The rigid node connection of the utility model is safe and reliable, the force transmission path is clear, the on-site construction is convenient, and it has engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a rigid node structure for a hollow truss provided in an embodiment of the utility model, wherein: Figure 1 (a) is a schematic diagram of the node plane from a top-down perspective. Figure 1 (b) is a schematic diagram of the reinforcement arrangement of the chord and secondary beam inside the outer steel jacket;

[0017] Figure 2 The underlying node provided for an embodiment is along Figure 1 (a) Sectional view of AA and BB;

[0018] Figure 3 The middle layer node provided for a certain embodiment is along Figure 1 (a) Sectional view of AA and BB;

[0019] Figure 4 The top node provided for an embodiment is along Figure 1 (a) Sectional view of AA and BB;

[0020] Figure 5 For along Figure 1 (a) Cross-sectional view of CC.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Chord, 2. Secondary beam, 3. Vertical web member, 3a. Upper web member, 3b. Lower web member, 4. External steel sleeve, 5. Outer web plate, 6. Inner web plate, 7. Upper flange plate, 8. Lower flange plate, 9. Opening, 10. First longitudinal reinforcement, 11. Additional stirrups, 12. Second longitudinal reinforcement, 13. Bolts. DETAILED DESCRIPTION

[0023] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0025] It will be appreciated that spatial relationship terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, the element or feature described as "under other elements" or "under it" or "under it" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0026] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0027] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0028] See also Figure 1 , Figure 1 The structure of a rigid node of a hollow truss in an embodiment of the utility model is shown, wherein: Figure 1 (a) is a schematic diagram of the rigid node plane from a top view. Figure 1 (b) is a schematic diagram of the steel bar arrangement of the chord 1 and the secondary beam 2 inside the outer steel sleeve 4.

[0029] like Figure 1As shown, this embodiment provides a rigid node for a hollow truss, including two vertical chords 1, vertical webs 3 and secondary beams 2, wherein the chords 1 and secondary beams 2 are made of reinforced concrete, the vertical webs 3 are solid tubular or hollow tubular structures, such as hollow steel tube webs or steel tube concrete webs, and the cross section of the vertical webs 3 is rectangular or circular. The rigid node also includes an outer steel sleeve 4, which is sleeved at the node of the chord 1, the center of the outer steel sleeve 4 coincides with the axis of the vertical web 3, and the end of the vertical web 3 and the junction of the outer steel sleeve 4 are welded by full penetration. The node is provided with an opening 9 that passes through the outer steel sleeve 4 and the chord 1, the position of the opening 9 corresponds to the position of the secondary beam 2, the shape of the opening 9 is adapted to the shape of the secondary beam 2, and the size of the opening 9 is consistent with the cross-sectional size of the reinforced concrete secondary beam 2. For example, when a secondary beam 2 with a rectangular cross section is used, the opening 9 is also set to a rectangle with the same size. The secondary beam 2 passes through the outer steel sleeve 4 through the opening 9 and is integrally connected with the chord 1 through concrete.

[0030] It can be understood that in order to solve the problem pointed out in the background technology, this embodiment pre-sets the outer steel sleeve 4 at the position corresponding to the rigid node on the reinforced concrete chord 1, and the steel tube concrete vertical web member 3 is directly welded to the outer steel sleeve 4 on site with full penetration, which can increase the node stiffness and ensure the effective transmission of the bending moment. Figure 1 As shown in (b), the steel bars in the reinforced concrete chord 1 can directly pass through the outer steel sleeve 4, and the steel bars in the secondary beam 2 can pass through the outer steel sleeve 4 through the reserved opening 9, and then the outer steel sleeve 4 is poured with concrete, which is convenient for construction and reliable in quality. The rigid node connection of the utility model is safe and reliable, the force transmission path is clear, the on-site construction is convenient, and it has engineering application value.

[0031] like Figure 2 to Figure 4 As shown, the rigid node of this embodiment is applied to the laminated hollow truss structure, and can be used as a bottom node, a middle node, or a top node. The main difference lies in the different connection positions of the vertical web member 3 and the outer steel sleeve 4.

[0032] In one possible implementation, Figure 3For example, the outer steel sleeve 4 includes an outer web 5, an inner web 6, an upper flange plate 7 and a lower flange plate 8. The outer web 5, the upper flange plate 7 and the lower flange plate 8 are arranged along the circumference of the chord 1 to form a transverse cylindrical space surrounding the chord 1, and the chord 1 transversely penetrates the cylindrical space. Specifically, there are two vertically arranged outer webs 5, and the two vertically arranged outer webs 5 are symmetrically arranged about the cylindrical space. The upper flange plate 7 and the lower flange plate 8 are arranged at the upper and lower ends of the outer web 5 in a one-to-one correspondence and are fixedly connected to the upper and lower ends of the outer web 5. The upper flange plate 7 and / or the lower flange plate 8 are also connected to the vertical web 3. The upper flange plate 7 and the lower flange plate 8 can increase the stability and reliability of the connection between the outer steel sleeve 4 and the vertical web 3. The inner web 6 is arranged vertically along the length direction of the chord 1 and is fixedly connected to the inner side of the outer web 5. The inner web 6 divides the cylindrical space into multiple subspaces, and the steel bars in the chord 1 can pass through each space. The opening 9 passes through the outer web 5 and the inner web 6, that is, the secondary beam 2 can pass through the outer web 5 and the inner web 6 through the opening 9, and is solidified into one with the chord 1 through concrete. The multiple cavities formed by the outer web 5 and the inner web 6 can further strengthen the structural strength at the node, increase the node stiffness, and ensure the effective transmission of the bending moment.

[0033] In one possible implementation, Figure 1 (b) shows the arrangement of the steel bars of the chord 1 and the secondary beam 2 inside the outer steel jacket 4. Figure 1 (b) and Figure 2 to Figure 4 The chord 1 is provided with a plurality of first longitudinal bars 10, which are arranged along the length direction of the chord 1 and penetrate the subspace in the cylindrical space; the secondary beam 2 is provided with a plurality of second longitudinal bars 12, which are arranged along the length direction of the secondary beam 2 and penetrate the outer steel jacket 4 through the opening 9, and the first longitudinal bars 10 and the second longitudinal bars 12 are perpendicularly intersected in the outer steel jacket 4; the outer steel jacket 4 is filled with concrete. Pressure grouting can be used inside the outer steel jacket 4 of the reinforced concrete chord 1 to ensure that the concrete in this area is poured densely.

[0034] The first longitudinal reinforcement 10 and the second longitudinal reinforcement 12 are staggered inside the outer steel sleeve 4 and cast into an integrated structure by concrete, which can improve the connection reliability of the node. Preferably, the beam height of the reinforced concrete secondary beam 2 is not greater than the cross-sectional height of the chord 1 minus 200mm, and the beam surface elevation of the secondary beam 2 is preferably 100mm lower than the top surface elevation of the chord 1 to ensure that the second longitudinal reinforcement 12 in the secondary beam 2 can directly pass through the reserved openings 9 on the outer web 5 and the inner web 6 of the outer steel sleeve 4.

[0035] In one possible implementation manner, a plurality of bolts 13 are fixedly disposed on the inner side of the outer steel casing 4, for example Figure 2 to Figure 4 As shown, a plurality of studs 13 are fixedly arranged on the inner side of the outer web 5 and the inner side of the upper flange plate 7 and the inner side of the lower flange plate 8, respectively. Several of the studs 13 are embedded in the concrete of the chord 1 and the secondary beam 2, and the first longitudinal reinforcement 10 in the chord 1 and the second longitudinal reinforcement 12 in the secondary beam 2 do not interfere with the studs 13.

[0036] It is understandable that the multiple studs 13 in the outer steel sleeve 4 are embedded in the concrete of the chord 1 and the secondary beam 2. The studs, as commonly used shear connectors, bear the longitudinal shear force on the interface of various materials to ensure the joint action of steel and concrete. Preferably, the diameter of the studs 13 is not less than 16 mm, and the distance between adjacent studs 13 is not more than 200 mm.

[0037] In one possible implementation, Figure 2 to Figure 4 As shown, the rigid node can be used for the bottom layer, middle layer and top layer of the hollow truss. Specifically, when the node is located at the bottom layer of the hollow truss, the vertical web member 3 is an upper web member 3a, and the upper web member 3a is welded to the upper flange plate 7; when the node is located at the middle layer of the hollow truss, the vertical web member 3 includes an upper web member 3a and a lower web member 3b, and the upper web member 3a is welded to the upper flange plate 7, and the lower web member 3b is welded to the lower flange plate 8; when the node is located at the top layer of the hollow truss, the vertical web member 3 is a lower web member 3b, and the lower web member 3b is welded to the lower flange plate 8.

[0038] In one possible implementation, the thickness of the outer web 5, upper flange 7 and / or lower flange 8 is not less than the wall thickness of the vertical web member 3 to ensure the structural strength of the outer steel jacket 4. Preferably, the thickness of the inner web is not less than 20 mm.

[0039] In one possible implementation, a plurality of additional stirrups 11 are coaxially sleeved on the chord 1, and the additional stirrups 11 are adjacent to the outer side of the end of the outer steel sleeve 4, and gaps are provided between adjacent additional stirrups 11. Figure 1 As shown in (b), the first longitudinal reinforcement 10 in the reinforced concrete chord 1 passes through the cavity in the outer steel sleeve 4. Within the length range of the outer steel sleeve 4, the chord 1 is not provided with stirrups; outside the end of the outer steel sleeve 4, three additional stirrups 11 are centrally provided on the chord 1. The diameter of the additional stirrups 11 is consistent with the diameter of the stirrups at other parts of the chord 1. Preferably, the distance between adjacent additional stirrups 11 is 50 mm.

[0040] In one possible implementation, Figure 5As shown, the length of the outer steel sleeve 4 along the length direction of the chord 1 is not less than 3 times the long side dimension hc of the cross section of the vertical web member 3 (for example, the diameter of the circular cross-section web member) to ensure that the outer steel sleeve 4 has sufficient structural strength.

[0041] Here is an example of a specific implementation case:

[0042] In a 4-story podium building, the building column grid is 8m×8m. Due to the needs of the building function, some side columns cannot be grounded on the first floor, and the side columns of the 2nd to 4th floors form a hollow truss. After calculation, the bending moment of the hollow truss web is too large. The side webs of the vertical web 3 are made of square steel tube concrete structure, and the chord 1 and the rest of the webs of the vertical web 3 are still made of reinforced concrete structure. The cross-sectional dimensions of the square steel tube concrete vertical web member 3 are box 600mm (length) × 600mm (width) × 30mm (wall thickness), the cross-sectional dimensions of the upper and lower chords 1 are 800mm × 1000mm, the cross-sectional dimensions of the secondary beam 2 are 300mm × 700mm, and the elevation of the secondary beam 2 surface is 100mm lower than the elevation of the chord 1 surface; the thickness of the outer web 5 and the upper flange plate 7 and the lower flange plate 8 of the outer steel sleeve 4 are all 30mm, and two inner webs 6 with a thickness of 20mm are arranged in the middle of the outer steel sleeve 4. The length of the outer steel sleeve 4 is 1800mm; at the junction of the secondary beam 2 and the chord 1, the rectangular opening 9 with a size of 300mm × 700mm is reserved in the inner and outer webs of the outer steel sleeve 4, and the inner sides of the outer web 5 and the upper flange plate 7 and the lower flange plate 8 of the outer steel sleeve 4 are all provided with studs 13 with a size of φ16@200. This design method is used for the nodes of the bottom, middle and top layers of the open-web truss.

[0043] During the implementation, the outer steel sleeve 4 was made and the inner bolts 13 were welded in the steel structure factory. The steel tube concrete vertical web member 3 and the outer steel sleeve 4 were welded on site. The first longitudinal reinforcement 10 in the chord 1 passed through the cavity in the outer steel sleeve 4, and the second longitudinal reinforcement 12 in the secondary beam 2 passed through the reserved opening 9 in the web. Within the length of the outer steel sleeve 4, the chord 1 was not provided with stirrups; at the end of the outer steel sleeve 4, the chord 1 was centrally provided with 3φ12@50 additional stirrups 11.

[0044] Case studies have shown that the node connection of the utility model is safe and reliable, the force transmission path is clear, the on-site construction is convenient, and it has engineering application value.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rigid node for a hollow truss, comprising two vertical chords (1), a vertical web member (3) and a secondary beam (2), wherein the chord (1) and the secondary beam (2) are made of reinforced concrete, and characterized in that: It also includes an outer steel sleeve (4), the outer steel sleeve (4) is sleeved at the node of the chord (1), the vertical web member (3) and the outer steel sleeve (4) are welded by full penetration, and a hole (9) is provided at the node that passes through the outer steel sleeve (4) and the chord (1), and the secondary beam (2) passes through the outer steel sleeve (4) through the hole (9) and is connected to the chord (1) in an integral manner through concrete.

2. A rigid node for a venter truss according to claim 1, characterized in that: The outer steel sleeve (4) comprises an outer web (5), an inner web (6), an upper flange plate (7) and a lower flange plate (8); the outer web (5), the upper flange plate (7) and the lower flange plate (8) are arranged along the circumference of the chord (1) to form a cylindrical space surrounding the chord (1); the upper flange plate (7) and the lower flange plate (8) are arranged at the upper and lower ends of the cylindrical space in a one-to-one correspondence and are fixedly connected to the outer web (5); the upper flange plate (7) and / or the lower flange plate (8) are also connected to the vertical web (3); the inner web (6) is arranged vertically along the length direction of the chord (1) and is fixedly connected to the inner side of the outer web (5); the inner web (6) divides the cylindrical space into a plurality of subspaces; and the opening (9) passes through the outer web (5) and the inner web (6).

3. A rigid node for a venter truss according to claim 2, characterized in that: A plurality of first longitudinal bars (10) are provided in the chord (1), the first longitudinal bars (10) are arranged along the length direction of the chord (1), and the first longitudinal bars (10) penetrate the subspace in the cylindrical space; a plurality of second longitudinal bars (12) are provided in the secondary beam (2), the second longitudinal bars (12) are arranged along the length direction of the secondary beam (2), and the second longitudinal bars (12) penetrate the outer steel casing (4) through the opening (9); and the outer steel casing (4) is filled with concrete.

4. A rigid node for a venter truss according to claim 2, characterized in that: A plurality of studs (13) are fixedly provided on the inner side of the outer steel sleeve (4), and the plurality of studs (13) are embedded in the concrete of the chord (1) and the secondary beam (2), and the first longitudinal reinforcement (10) in the chord (1) and the second longitudinal reinforcement (12) in the secondary beam (2) do not interfere with the studs (13).

5. A rigid node for a vierendeel truss according to claim 2, characterized in that: When the node is located at the bottom layer of the hollow truss, the vertical web member (3) is an upper web member (3a), and the upper web member (3a) is welded to the upper flange plate (7); when the node is located at the middle layer of the hollow truss, the vertical web member (3) comprises an upper web member (3a) and a lower web member (3b), the upper web member (3a) is welded to the upper flange plate (7), and the lower web member (3b) is welded to the lower flange plate (8); when the node is located at the top layer of the hollow truss, the vertical web member (3) is a lower web member (3b), and the lower web member (3b) is welded to the lower flange plate (8).

6. A rigid node for a vierendeel truss according to claim 2, characterized in that: The thickness of the outer web plate (5), the upper flange plate (7) or the lower flange plate (8) is not less than the thickness of the tube wall of the vertical web member (3).

7. A rigid node for a vierendeel truss according to claim 2, characterized in that: The coaxial sleeve on the chord (1) is provided with a plurality of additional stirrups (11), the additional stirrups (11) being adjacent to the outer side of the end of the outer steel sleeve (4), and gaps being provided between adjacent additional stirrups (11).

8. A rigid node for a venter truss according to any one of claims 1 to 7, characterized in that: The vertical web member (3) is a hollow steel tube web member or a steel tube concrete web member, and the cross section of the vertical web member (3) is rectangular or circular.

9. A rigid node for a venter truss according to any one of claims 1 to 7, characterized in that: The length of the outer steel sleeve (4) along the length direction of the chord (1) is not less than 3 times the length of the long side of the cross section of the vertical web member (3).

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