Complex large-span bionic cantilever plane truss structure and construction method thereof

Abstract

The invention relates to the technical field of building structures, in particular to a complex large-span bionic overhanging plane truss structure and a construction method thereof.The complex large-span bionic overhanging plane truss structure comprises a landing primary truss, a barrel ring truss, an overhanging continuous truss, a secondary truss, a fringe truss and a composite truss. According to the composite truss, the rhythm feeling of structural space change is reflected, the structural force transmission mode is clearer, the building curvature beauty is reflected, the structure looks lighter and more attractive visually, the web members in the composite truss are innovatively made of bamboo steel materials, consumption of steel resources is reduced, energy is saved, environment friendliness is achieved, the composite truss is connected through high-strength bolts, construction is fast and convenient, and construction cost is reduced. The construction time and the labor cost are reduced, and the quality problems that the structure appearance is badly affected and even decorative components installed on the periphery of the structure are damaged due to the fact that the vertical displacement of the cantilever end is gradually increased in the structure dead weight or follow-up load applying process are avoided through the pre-deformation control system.

Description

Technical Field

[0001] The invention relates to the technical field of building structures, and in particular to a complex large-span bionic cantilevered plane truss structure and a construction method thereof. Background Art

[0002] With the development of society, people have higher requirements for the beauty and shape of buildings. Architects have also begun to pursue unique and innovative designs. Bionic design concepts have gradually become popular. At the same time, new materials such as high-strength steel have continued to emerge. They have higher strength, toughness and corrosion resistance, and can meet the stress requirements of complex large-span cantilevered steel structures, reduce the deadweight of the structure, and improve the bearing capacity and seismic performance of the structure. Complex large-span bionic cantilevered steel structures can integrate regional culture and traditional elements, and by imitating local natural landscapes or biological forms, give the building a unique appearance and artistic value, expressing respect and inheritance for local culture.

[0003] At present, the commonly used structural form of complex large-span bionic cantilever steel structures is the grid structure. Although the structure has good overall rigidity and obvious spatial synergy, it has many components, is messy, not simple, not transparent, and has complex intersection nodes;

[0004] However, it is subject to certain restrictions during use and cannot meet people's growing pursuit of architectural appearance with high visual impact and artistic appeal. At the same time, due to the large span of the cantilever end of the complex large-span bionic cantilever steel structure, it will produce large vertical deformation, which may have an adverse effect on the appearance of the structure and even cause damage to the decorative components installed on the periphery of the structure. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a complex large-span bionic cantilevered plane truss structure and a construction method thereof, which can effectively solve the problems raised in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a complex large-span bionic cantilever plane truss structure, comprising a grounded main truss, a cylinder ring truss, a cantilevered continuous truss, a secondary truss, a side truss and a composite truss. The grounded main truss is connected to the cylinder ring truss and the cantilevered continuous truss therebetween through intersecting welding nodes, the cantilevered continuous truss is connected to the secondary truss and the side truss through intersecting welding nodes, and the secondary truss, the side truss and the composite truss are connected through intersecting welding nodes.

[0008] Furthermore, the maximum bending diameter of the ground-mounted main truss is 950 mm, the thickness is 40 mm, and the material of the ground-mounted main truss is Q420GJC.

[0009] Furthermore, the cylinder ring truss includes a core tube and an outer ring truss, and the core tube and the outer ring truss are welded.

[0010] Furthermore, the cantilever continuous truss includes a cantilever structure and a continuous truss, and the cantilever structure and the continuous truss are connected via intersecting welding nodes.

[0011] Further, the secondary trusses and side trusses include secondary trusses and side trusses, the secondary trusses are auxiliary trusses between the main trusses, and the side trusses are trusses arranged at the edges of the structure.

[0012] Furthermore, the composite truss includes a chord and a web, the chord is made of steel, the web is made of bamboo steel, high-strength bolts are installed between the chord and the web, the high-strength bolts are Class B, made of Q355, and have a hole diameter of 24.5 mm, and a steel plate with a thickness of 16 mm is arranged between the high-strength bolts and the web, and the material of the steel plate is Q355B.

[0013] A method for constructing a complex large-span bionic cantilever plane truss structure includes a pre-deformation control system, wherein the pre-deformation control system includes components such as a traction end, a steel strand, a pre-deformation adjustment device, and a pre-deformation control device embedded in a concrete structure. The pre-deformation control system is segmented and numbered before construction. The construction is carried out on site by adopting a horizontal assembly and block-by-block hoisting installation method according to the segment numbering. The pre-deformation control device is embedded below the key control point of the cantilever end of the structure. The pre-deformation control device is made of a 12 mm thick steel plate and consists of an upper and lower part. The middle of the pre-deformation control device is It is connected by four Φ12 steel screws through welding, and a control hole with a diameter of 30mm is set in the middle of the upper vertical steel plate for passing the steel strand. The exposed surface of the steel plate is fully painted with anti-rust paint. The pre-deformation tension is applied to the complex large cantilever steel structure plane truss through the pre-deformation control system to pre-reach the design displacement of the main structure under the dead weight of the structure or the subsequent installation load, and gradually release the pre-deformation adjustment device as the dead weight of the structure or the subsequent installation load increases. After all the loads are applied, the pre-deformation of the adjustment device is released, and the construction of the complex large cantilever steel structure plane truss is completed.

[0014] The assembly sequence of the pre-deformation control system is as follows: the upper end of the steel strand is anchored to the traction end of the key control point, the lower part is inserted into the control hole of the pre-deformation control device, and the hand-pulled hoist adjustment device is used in the middle to connect the upper and lower steel strands together. The steel strand can be made of steel wire rope, chain, steel cable, etc. according to actual needs.

[0015] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0016] 1. The complex large-span bionic cantilever plane truss structure is simple and transparent, perfectly presenting the skeleton beauty of the structure and embodying the rhythmic sense of structural space changes;

[0017] 2. The structural force transmission mode is more clear, reflecting the beauty of the building's curvature, and the structure appears lighter and more beautiful visually;

[0018] 3. The composite truss uses bamboo steel as the center member, which reduces the weight of the structure, reduces the consumption of steel resources, and is energy-saving and environmentally friendly;

[0019] 4. The composite truss is connected by high-strength bolts, which makes the construction quick and convenient, reducing the construction time and labor costs;

[0020] 5. By applying pre-deformation tension to the complex large-span bionic cantilever plane truss structure through the pre-deformation control system, it is possible to avoid the gradual increase of the vertical displacement of the cantilever end during the self-weight of the structure or the subsequent load application, which will cause adverse effects on the appearance of the structure and even cause quality problems such as damage to the decorative components installed on the periphery of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of a complex large-span bionic cantilever plane truss structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the ground main truss structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the cylinder ring truss structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the cantilever continuous truss structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the secondary truss and side truss structure of the present invention;

[0027] Figure 6 It is a schematic diagram of the composite truss structure of the present invention;

[0028] Figure 7 It is a framework diagram of the construction method of the present invention;

[0029] Figure 8 It is the node diagram of the composite truss of the present invention;

[0030] Fig. 9 It is the zone diagram of the weld of the tubular intersecting node of the present invention;

[0031] Fig.10 It is a zoned node diagram of the tubular intersecting node weld of the present invention;

[0032] Fig.11 It is a welding pattern drawing of different widths or thicknesses of the present invention;

[0033] Fig.12 It is a composition diagram of the pre-deformation control system of the present invention;

[0034] Fig.13 This is a large-scale diagram of the pre-deformation control device of the present invention.

[0035] The numbers in the figure represent:

[0036] 1. Ground-mounted main truss; 2. Cylinder ring truss; 3. Cantilever continuous truss; 4. Secondary truss and side truss; 5. Composite truss; 51. Chord; 52. Web member; 53. Steel splint; 54. High-strength bolt; 6. Pre-deformation control device; 61. Steel screw; 62. Steel plate; 63. Control hole; 7. Pre-deformation adjustment device; 8. Steel strand; 9. Traction end. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The present invention will be further described below in conjunction with the embodiments.

[0039] Embodiment 1:

[0040] Reference Figure 1-6 , which is the first embodiment of the present invention, a complex large-span bionic cantilever plane truss structure, includes a grounded main truss 1, a cylinder ring truss 2, a cantilevered continuous truss 3, a secondary truss and a side truss 4 and a composite truss 5. The grounded main truss 1 is connected to the cylinder ring truss 2 and the cantilevered continuous truss 3 therebetween through intersecting welding nodes, the cantilevered continuous truss 3 is connected to the secondary truss and the side truss 4 through intersecting welding nodes, and the secondary truss and the side truss 4 are connected to the composite truss 5 through intersecting welding nodes.

[0041] Embodiment 2:

[0042] Reference Figure 1-6, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the maximum bending diameter of the ground main truss 1 is 950mm, the thickness is 40mm, the material of the ground main truss 1 is Q420GJC, and the ground main truss 1 adopts 100,000 KW high-power medium-frequency electric heating hot bending equipment to perform bidirectional bending of the components;

[0043] The cylinder ring truss 2 includes a core tube and an outer ring truss, which are welded together. The core tube is usually made of steel structure and bears most of the vertical loads and horizontal loads (such as wind loads and earthquake loads). The outer ring truss is composed of horizontal trusses and diagonal braces, arranged outside the ground main truss 1, and transmits loads with the core tube through a rigid connection. The core tube and the ring truss work together to form an efficient spatial force system.

[0044] The cantilever continuous truss 3 includes a cantilever structure and a continuous truss. The cantilever structure and the continuous truss are connected by intersecting welding nodes. One end of the cantilever structure is fixed and the other end extends outward to form an unsupported cantilever. Multiple truss units of the continuous truss are connected by nodes to form a continuous force system. The cantilever structure adopts elastic deformation verification to calculate the deflection of the cantilever end to ensure that it is within the allowable range, verify the structural stiffness to prevent excessive deformation from affecting use, conduct regular inspections and maintenance, promptly discover and deal with problems, and promptly repair and reinforce damaged or aged parts;

[0045] Secondary trusses and side trusses 4 include secondary trusses and side trusses. Secondary trusses are auxiliary trusses between main trusses, usually used to support local loads or enhance the overall stability of the structure. Side trusses are trusses arranged at the edge of the structure, usually used to close the boundary of the structure or transfer edge loads.

[0046] The composite truss 5 includes a chord 51 and a web 52. The chord 51 is made of steel, and the web 52 is made of bamboo steel. The bamboo steel has been treated with anti-corrosion and has good corrosion resistance and insect resistance, and is suitable for outdoor use. After the bamboo steel has been treated with fireproofing, it has a certain flame retardancy and is suitable for places with high fire protection requirements. A high-strength bolt 54 is installed between the chord 51 and the web 52. The high-strength bolt 54 is Class B, made of Q355, and has a hole diameter of 24.5 mm. A steel plywood 53 with a thickness of 16 mm is arranged between the high-strength bolt 54 and the web 52, that is, the bamboo steel. The material of the steel plywood 53 is Q355B.

[0047] The remaining structures are the same as those of Example 1.

[0048] Embodiment 3:

[0049] Reference Figure 7-13, which is the third embodiment of the present invention, and this embodiment is different from the second embodiment in that: the sections are numbered before construction, and the construction is carried out on site by horizontal assembly and block hoisting according to the section numbering. A pre-deformation control device 6 is embedded below the key control point of the cantilever end of the structure, and a pre-deformation tension is applied to the plane truss of the complex large cantilever steel structure through the pre-deformation control system to pre-reach the design displacement of the main structure under the deadweight of the structure or the subsequent installation load, and the pre-deformation adjustment device 7 is gradually released as the deadweight of the structure or the subsequent installation load increases. After all the loads are applied, the pre-deformation amount of the adjustment device is released, and the construction of the plane truss of the complex large cantilever steel structure is completed;

[0050] At the joint of butt welds, when the widths of welds are different or the thickness difference on one side is more than 4mm (when the thickness of the thinner plate is greater than 12mm), or 2mm (when the thickness of the thinner plate is less than 12mm), a slope of not more than 1:2.5 should be made from one or both sides in the width direction or thickness direction, butt welds shall not be arranged in a concentrated manner, and non-destructive testing shall be carried out;

[0051] For the joints of circular pipe intersecting welding, the connecting welds of the branch pipe and the main pipe shall be welded continuously along the whole circumference and smoothly transitioned. The intersecting line welds are divided into three areas: A area (toe), B area (side) and C area (heel). A complete groove is cut in A area and B area, and a transition groove is cut in the transition area from B to C. When the angle between the branch pipe and the main pipe in C area is less than 45, no groove is cut. The welds in A area and B area are full penetration groove welds, the transition area from B to C is a partial penetration weld, and the C area is a fillet weld. The effective height of the fillet weld is 1.25t (t is the wall thickness of the branch pipe), and the shape and size details of the full penetration weld, partial penetration weld and fillet weld shall comply with the requirements of the current "Steel Structure Welding Code";

[0052] The plane truss curved rod needs to be continuously bent by the detailing personnel for the curved components to perfectly present the bionic smoothness of the curved components without any creases or uneven surface convexities.

[0053] Before construction, BIM technology was used for construction simulation, and finite element analysis software was used to simulate and analyze the stress conditions during the entire installation process to guide on-site construction;

[0054] For buildings with complex structural systems and huge cantilevers, 3D printing technology is used to simulate the site and building topography after completion to conduct physical wind tunnel tests, so as to obtain test data and prove the wind pressure resistance safety of the structure;

[0055] The complex large-span bionic cantilever plane truss structure is divided into the ground main truss embedding area and the upper structure plane truss installation area;

[0056] The steel structure can be installed only after the anchor bolt sizes of the column foot plate and truss support bottom plate of the ground-standing main truss meet the requirements after re-inspection and the foundation concrete strength reaches 100% of the design strength;

[0057] The column bases in the buried area are assembled on site and hoisted in sections. After the column bases are hoisted, temporary tie rods are required between adjacent column bases to enhance the integrity of the structure. The column base connecting rods are P203mm×6mm, made of Q235, with a total length of 25m. Fillet welds are used to connect the tie rods to the column bases.

[0058] The upper structure plane truss installation area adopts the construction method of ground assembly and block hoisting. During the assembly process, horse stools are set at intervals of 3m between the upper and lower chords of the truss, and one middle web is set;

[0059] During the segmented hoisting process of the upper structure plane truss, a temporary support frame needs to be set up at the bottom. The support frame columns are made of P609mm×18mm round tubes, made of Q355, the support frame webs are made of C40a channel steel, and the top conversion platform of the support frame is made of Y-shaped steel beams. The support frame columns fall on the basement structure floor or other hardened ground with sufficient strength;

[0060] After the temporary load-bearing frame is removed, a pre-deformation control device is buried at the corresponding structural plate position at the lower part of the cantilever continuous truss. The pre-deformation control device 6 is made of a 12mm thick steel plate and consists of an upper and lower part, which are connected by four Φ12 steel screws 61 through welding. A control hole 63 with a diameter of 30mm is set in the middle of the upper vertical steel plate 62 for passing the steel strand 8. The exposed surface of the steel plate 62 is fully painted with anti-rust paint;

[0061] The pre-deformation control system includes components such as a traction end 9, a steel strand 8, a pre-deformation adjustment device 7 and a pre-deformation control device 6 embedded in the concrete structure;

[0062] HSZ-C type 10-ton hand chain hoist is used as the pre-deformation adjustment device 7, the hand chain plate is made of overheated ductile iron castings, the lifting chain is made of 20 manganese steel, the grade is 80, the lifting sprocket and the upper and lower hooks are made of high-quality alloy steel, the material meets the requirements of the current "Alloy Structural Steel", and the upper and lower hooks are equipped with safety tongues;

[0063] The assembly sequence of the pre-deformation control system is as follows: the upper part of the steel strand 8 is anchored on the traction end 9 of the key control point, and the lower part is inserted into the control hole 63 of the pre-deformation control device 6. The upper and lower ends of the steel strand 8 are connected together by a hand chain hoist adjustment device in the middle. The steel strand 8 can be made of steel wire rope, chain, steel cable, etc. according to actual needs;

[0064] Pre-deformation tension needs to be applied to each key control point of the structure at the same time, and the deformation of the cantilevered end of the plane truss of the steel structure is controlled by adjusting the traction distance of the structure by the device, and gradually coordinated and released synchronously with the application of subsequent loads;

[0065] The construction accuracy requirements of the pre-deformation control system are relatively high, as follows:

[0066] 1. Measurement accuracy

[0067] Initial measurement: the error is controlled within ±1mm;

[0068] Real-time monitoring: The accuracy of monitoring equipment must reach 0.1mm;

[0069] 2. Material processing accuracy

[0070] Component processing: error is controlled within ±0.5mm;

[0071] Connector accuracy: error does not exceed ±0.2mm;

[0072] 3. Installation accuracy

[0073] Positioning installation: the error is controlled within ±1mm;

[0074] Adjustment accuracy: The adjustment error does not exceed ±0.5mm;

[0075] 4. Welding and connection accuracy

[0076] Welding: The weld error shall not exceed ±0.5mm;

[0077] Bolt connection: The bolt hole position error is controlled within ±0.2mm;

[0078] 5. Pre-deformation control

[0079] Pre-deformation: The error is controlled within ±5% of the design value;

[0080] Deformation uniformity: deformation is uniform, and the local deviation does not exceed ±2mm;

[0081] 6. Construction process control

[0082] Construction sequence: Construction must be carried out strictly in accordance with the design sequence to avoid error accumulation;

[0083] Real-time adjustment: timely adjustment based on monitoring data to ensure accuracy;

[0084] 7. Acceptance Criteria

[0085] Overall acceptance: the overall error shall not exceed ±5mm;

[0086] Local acceptance: local error shall not exceed ±2mm;

[0087] When constructing the plane truss, a large mesh made of nylon flame-retardant material is used for horizontal safety protection. The mesh size shall not be larger than 80mm×80mm. The entire mesh shall not be damaged or decayed, and shall have good flame retardancy, impact resistance and weather resistance.

[0088] Oblique photography technology and 3D laser scanning technology are used to monitor the full-field deformation of the structure and the deformation of the cantilever end at different construction stages.

[0089] The remaining structure is the same as that of Example 2.

[0090] The above 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 with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A complex large-span bionic cantilever plane truss structure, characterized in that: The invention comprises a grounded main truss (1), a cylindrical ring truss (2), a cantilevered continuous truss (3), a secondary truss and a side truss (4) and a composite truss (5); the grounded main truss (1) is connected to the cylindrical ring truss (2) and the cantilevered continuous truss (3) therebetween via intersecting welding nodes; the cantilevered continuous truss (3) is connected to the secondary truss and the side truss (4) via intersecting welding nodes; and the secondary truss and the side truss (4) are connected to the composite truss (5) via intersecting welding nodes.

2. The complex large-span bionic cantilever plane truss structure according to claim 1, characterized in that: The maximum bending diameter of the ground-mounted main truss (1) is 950 mm, the thickness is 40 mm, and the material of the ground-mounted main truss (1) is Q420GJC.

3. The complex large-span bionic cantilever plane truss structure according to claim 1 is characterized in that: The cylinder ring truss (2) comprises a core cylinder and an outer ring truss, and the core cylinder and the outer ring truss are welded.

4. The complex large-span bionic cantilever plane truss structure according to claim 1, characterized in that: The cantilever continuous truss (3) comprises a cantilever structure and a continuous truss, and the cantilever structure and the continuous truss are connected via intersecting welding nodes.

5. The complex large-span bionic cantilever plane truss structure according to claim 1 is characterized in that: The secondary trusses and side trusses (4) include secondary trusses and side trusses, wherein the secondary trusses are auxiliary trusses between the main trusses and the side trusses are trusses arranged at the edges of the structure.

6. The complex large-span bionic cantilever plane truss structure according to claim 1 is characterized in that: The composite truss (5) comprises a chord (51) and a web (52), wherein the chord (51) is made of steel, and the web (52) is made of bamboo steel. A high-strength bolt (54) is installed between the chord (51) and the web (52), wherein the high-strength bolt (54) is of Class B, made of Q355, and has a hole diameter of 24.5 mm. A steel clamp (53) with a thickness of 16 mm is arranged between the high-strength bolt (54) and the web (52), and wherein the steel clamp (53) is made of Q355B.

7. A method for constructing a complex large-span bionic cantilevered plane truss structure as described in claims 1 to 6, characterized in that: The invention comprises a pre-deformation control system, wherein the pre-deformation control system comprises components such as a traction end (9), a steel strand (8), a pre-deformation adjustment device (7) and a pre-deformation control device (6) embedded in a concrete structure. The pre-deformation control system is segmented and numbered before construction. The construction is carried out on site by adopting a horizontal assembly and block-by-block lifting installation method according to the segment numbering. The pre-deformation control device (6) is embedded below a key control point at the cantilever end of the structure. The pre-deformation control device (6) is made of a 12 mm thick steel plate (62) and consists of an upper and lower part. The middle of the pre-deformation control device (6) is connected by four Φ12 steel screws (61) through welding. A control hole (63) with a diameter of 30 mm is arranged in the middle of the upper vertical steel plate (62) for passing the steel strand (8); Applying pre-deformation tension to the plane truss of the complex large cantilever steel structure through the pre-deformation control system, so as to reach the design displacement of the main structure under the self-weight of the structure or the subsequent installation load in advance, and gradually releasing the pre-deformation adjustment device (7) as the self-weight of the structure or the subsequent installation load increases, and after all the loads are applied, the pre-deformation amount of the adjustment device is released, and the construction of the plane truss of the complex large cantilever steel structure is completed; The assembly sequence of the pre-deformation control system is as follows: the upper part of the steel strand (8) is anchored on the traction end (9) of the key control point, the lower part of the steel strand (8) is inserted into the control hole (63) of the pre-deformation control device (6), and the middle part of the steel strand (8) is connected together by a hand-pulled hoist adjustment device to connect the upper and lower ends of the steel strand (8).

Images