Cable-supported dome rod piece sleeve collaborative reinforcing structure and construction method

Abstract

The invention provides a cable-supported dome rod piece and sleeve collaborative reinforcing structure and a construction method, and relates to the technical field of large-span space steel structure reinforcing, the cable-supported dome rod piece and sleeve collaborative reinforcing structure comprises a cable-supported dome space stress system, the cable-supported dome space stress system comprises original rod pieces and hollow ball joints, the original rod pieces are hollow steel pipes, and the ends of the original rod pieces are connected with the hollow ball joints in a penetrating mode; the two-section type sleeve comprises two semicircular pipe sections with the inner wall curvature matched with the outer wall of the original rod piece, the two pipe sections are in butt joint, a welding groove is formed in the butt joint edge, the two pipe sections are welded into the whole sleeve through a fillet weld, and the two ends of the two-section type sleeve extend to the outer side of the hollow sphere joint to cover a stress concentration area. The method has the beneficial effects that bolt connection is replaced by welding splicing, a continuous annular constraint structure is formed, stiffness mutation is eliminated, and the stress concentration coefficient is remarkably reduced; mechanical radial bolt adjustment is adopted, an elastic gasket is not needed, the positioning precision is not influenced by environment temperature difference, and uniform thickness of a glue layer is ensured.

Description

Technical Field

[0001] This invention relates to the field of reinforcement technology for large-span spatial steel structures, and in particular to a cable-stayed dome member sleeve collaborative reinforcement structure and construction method. Background Technology

[0002] As a typical large-span spatial load-bearing structure, the connection area between the original members and the hollow sphere joints of a cable-stayed dome is a critical part of load transfer, directly determining the overall structural load-bearing safety. With the functional upgrade of existing buildings, there is a need to lift heavy loads from the cable-stayed dome. The original member load-bearing capacity can no longer meet the requirements for the coordinated transfer of lifting loads and roof loads, and reinforcement is urgently needed.

[0003] Existing cable-stayed dome reinforcement technology has three major defects: First, the reinforcement sleeves are mostly fixed with stainless steel high-strength bolts. Uneven bolt preload can easily cause sudden stiffness changes, leading to stress concentration and making it impossible to form continuous circumferential constraints. Second, the adjustable positioning clamps are equipped with nitrile rubber elastic anti-slip pads. These pads are prone to aging and shrinkage in high-altitude temperature differences, resulting in a large coaxiality error between the sleeve and the original member. This, in turn, causes uneven thickness of the structural adhesive layer and low force transmission efficiency. These problems together result in insufficient integrity and stability of the reinforced structure, limited improvement in load-bearing capacity, and difficulty in meeting the stringent requirements of hoisting. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a cable-stayed dome member sleeve collaborative reinforcement structure and construction method to solve the technical problems of insufficient splicing stiffness, low positioning accuracy and poor compatibility with the original structure in the reinforcement of cable-stayed dome members.

[0005] Embodiments of the present invention provide a steel sleeve-assisted reinforcement structure for cable-stayed dome members, comprising: The cable-stayed dome space force-bearing system includes original members and hollow spherical nodes. The original members are hollow steel pipes with their ends connected through the hollow spherical nodes. The two-section sleeve includes two semi-circular tube segments whose inner wall curvature is adapted to the outer wall of the original member. The two tube segments are joined together, and a welding bevel is provided at the joining edge and welded into an integral sleeve by fillet weld. The two ends of the two-section sleeve extend to the outside of the hollow spherical node to cover the stress concentration area. An adjustable centering device includes a two-part clamp body and a plurality of radial adjusting bolts evenly arranged circumferentially. The clamp body is arranged at intervals along the axial direction of the two-part sleeve. The coaxiality control of the two-part sleeve and the original rod is achieved by the synchronous adjustment of the radial adjusting bolts. The full-area injection system includes an injection unit located outside one end of the two-section casing and an exhaust unit located outside one end of the casing. The injection unit and the exhaust unit are arranged along the casing axis, forming a closed injection cavity between the two-section casing and the cable-supported dome space force system. And a full-area adhesive layer, which is formed by injecting structural adhesive into the gap between the bi-slit sleeve and the original rod, and forms an annular reinforcing adhesive platform in the bonding area between the bi-slit sleeve and the hollow ball node.

[0006] Furthermore, the welding bevel of the two-section sleeve is a V-shaped bevel, and the weld height of the fillet weld is not less than 0.8 times the thickness of the two-section sleeve.

[0007] Furthermore, the radial adjustment bolt of the adjustable centering device is provided with a scale knob at its outer end. The scale knob cooperates with the laser diameter measuring instrument to control the coaxiality error between the two-section sleeve and the original rod 11 to ≤1mm.

[0008] Furthermore, the inner wall of the bi-section sleeve is provided with annular guide grooves at intervals along the length direction to guide the structural adhesive to flow uniformly; the width of the annular reinforcing adhesive platform in the area where the bi-section sleeve and the hollow sphere node are attached is greater than the width of the adhesive layer in other parts.

[0009] Furthermore, the grouting unit includes a grouting hole opened on the two-section casing, a threaded seat fixed to the grouting hole, and a high-pressure grouting nozzle sealed to the threaded seat; the venting unit includes a venting hole opened on the upper part of the two-section casing and a one-way venting valve installed in the venting hole.

[0010] Furthermore, the thickness of the bi-slit sleeve is 1.2-1.5 times the wall thickness of the original rod; the thickness of the adhesive layer of the full-area bonding layer is 2-3 mm.

[0011] Furthermore, the outer surface of the two-section sleeve is sequentially provided with an anti-corrosion coating and a fireproof coating, wherein the anti-corrosion coating includes a primer, an intermediate coat, and a topcoat.

[0012] A construction method for using the aforementioned cable-stayed dome member steel sleeve for collaborative reinforcement of the structure includes the following steps: S1. Surface treatment of the original structure: Sandblasting is performed on the bonding surfaces of the original rods and hollow ball joints to remove rust, with a rust removal grade of Sa2.5 and a surface roughness of Ra40-80μm. After cleaning, epoxy primer is applied. S2. Splicing and positioning of the two-part sleeve: The two sleeve halves are attached to the outside of the original member, so that both ends extend to the outside of the hollow ball node to cover the stress concentration area. After temporary fixation, fillet welds are made on the butt edges. The weld height is not less than 0.8 times the thickness of the sleeve. Non-destructive testing is performed after welding. At least two half-type clamp bodies are installed on the outer wall of the two-part sleeve. By synchronously adjusting the radial bolts and monitoring with a laser diameter gauge, the coaxiality error between the two-part sleeve 2 and the original member is ≤1mm. S3. Full-area grouting and curing: Use high-pressure grouting equipment to slowly inject structural adhesive from the grouting unit. Stop grouting and maintain pressure after continuous adhesive overflow from the venting unit. Cure for no less than 72 hours at an ambient temperature of not less than 15℃. S4. Surface treatment: Remove the construction equipment, seal the injection hole and vent hole with epoxy putty, and after shot blasting the outer surface of the two-section sleeve, spray the anti-corrosion coating and fireproof coating in sequence.

[0013] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: The cable-stayed dome member sleeve collaborative reinforcement structure and construction method of the present invention, by using welding splicing to replace bolt connection, forms a continuous circumferential constraint structure, eliminates abrupt changes in stiffness, and significantly reduces the stress concentration coefficient; the use of mechanical radial bolt adjustment eliminates the need for elastic pads, and the positioning accuracy is not affected by environmental temperature differences, ensuring uniform adhesive layer thickness and greatly improving force transmission efficiency; the sleeve extends to the outside of the ball joint at both ends, combined with the internal guide groove design, to achieve effective coverage of the stress concentration area and full filling of the adhesive layer, thereby strengthening the load-bearing capacity of the joint; the construction of an overall collaborative force-bearing system of "sleeve-adhesive layer-original member-ball joint" significantly improves the load-bearing capacity of the member, fully adapting to the needs of large-tonnage lifting. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the cable-stayed dome member sleeve collaborative reinforcement structure and construction method of the present invention; Figure 2 This is a longitudinal sectional view of the cable-stayed dome member sleeve collaborative reinforcement structure and construction method of the present invention.

[0015] In the diagram: 1. Cable-stayed dome space stress system; 11. Original member; 12. Hollow spherical node; 2. Two-section sleeve; 21. Welded bevel; 22. Annular guide channel; 3. Adjustable centering device; 31. Half-clamp body; 32. Radial adjusting bolt; 4. Full-area grouting system; 41. Exhaust unit; 42. Grouting unit; 5. Full-area adhesive layer; 51. Annular reinforcing adhesive platform. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of the various possible embodiments of the present invention, intended to provide a basic understanding of the invention, but not intended to identify key or decisive elements of the invention or to limit the scope of protection sought.

[0017] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0018] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0020] It should be further noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Please refer to Figure 1 and Figure 2 In this embodiment, the present invention provides a cable-stayed dome member steel sleeve collaborative reinforcement structure, including: cable-stayed dome spatial force system 1, two-section sleeve 2, adjustable centering device 3, full-area grouting system 4 and full-area cementing layer 5.

[0022] Among them, the cable-stayed dome space force system 1 consists of original members 11 and hollow spherical nodes 12. The original members 11 are hollow steel pipes, and their ends are connected to the hollow spherical nodes 12 by intersecting line welding. Multiple sets of original members 11 and spherical node units 12 are connected to form a space truss structure.

[0023] Furthermore, the two-section sleeve 2 is composed of two semi-circular tube segments whose inner wall curvature matches the outer wall of the original member 11. Each tube segment has a welding bevel 21 at its joint edge, and the two tube segments are welded together by fillet welds to form an integral sleeve. Both ends of the two-section sleeve 2 extend to the outside of the hollow spherical node 12, covering the stress concentration area between the original member 11 and the hollow spherical node 12. This allows for the elimination of splice gaps through welding, forming a continuous circumferential constraint.

[0024] Preferably, the welding groove 21 is a V-shaped groove, the weld height of the fillet weld is not less than 0.8 times the thickness of the sleeve, and the weld quality is qualified by ultrasonic flaw detection to ensure that the rigidity of the splice is consistent with the body of the two-section sleeve 2.

[0025] Understandably, the adjustable centering device 3 includes multiple two-half clamp bodies 31 arranged at intervals along the axial direction of the two-section sleeve 2, with multiple radial adjusting bolts 32 evenly arranged circumferentially on each half clamp body 31. By synchronously adjusting each bolt and monitoring with measuring instruments, the coaxiality of the two-section sleeve 2 and the original rod 11 can be precisely controlled, ensuring the uniform thickness of the subsequent adhesive layer.

[0026] As a preferred option, the radial adjusting bolt 32 has a graduated knob on its outer end. With the help of a laser diameter measuring instrument for real-time monitoring, the coaxiality error between the two-section sleeve 2 and the original rod 11 can be controlled within 1 mm, and the uniformity of the adhesive layer thickness can be reliably guaranteed.

[0027] Furthermore, the full-area injection system 4 includes an injection unit 42 disposed on the two-section casing 2 and an exhaust unit 41 disposed on the two-section casing 2. The two are symmetrically arranged along the two-section casing 2 to form a closed injection cavity.

[0028] In addition, the injection unit 42 can be set at the lower part of the two-section sleeve 2, and the venting unit 41 can be set at the upper part of the two-section sleeve 2, so as to ensure that the structural adhesive is injected from the low position and vented from the high position, so as to completely remove the air in the cavity and fully fill the adhesive.

[0029] More specifically, the grouting unit 42 includes a grouting hole opened at the lower part of the two-section sleeve 2, a threaded seat fixed to the grouting hole, and a high-pressure grouting nozzle sealed to the threaded seat; the venting unit 41 includes a venting hole opened at the upper part of the two-section sleeve 2 and a one-way venting valve installed in the venting hole to prevent the adhesive from flowing back and generating air bubbles.

[0030] In this embodiment, the full-area adhesive layer 5 is formed by injecting structural adhesive into the gap between the bi-slit sleeve 2 and the original rod 11 through the full-area injection system 4 to form a continuous adhesive layer. In the bonding area between the bi-slit sleeve 2 and the hollow sphere node 12, the adhesive naturally accumulates to form a thickened annular reinforcing adhesive platform 51, which strengthens the bonding force transmission in the node area.

[0031] To ensure uniform flow and distribution of the structural adhesive within the gap between the split sleeve 2 and the original member 11, annular guide grooves 22 are spaced along the length of the inner wall of the split sleeve 2 to guide the structural adhesive to flow evenly during the injection process. The width of the annular reinforcing adhesive platform formed by the annular guide grooves 22 is greater than the width of the adhesive layer in other parts to accommodate the high stress state of the joint area.

[0032] In a specific embodiment, the thickness of the two-section sleeve 2 is 1.2 to 1.5 times the wall thickness of the original rod 11, the thickness of the full-area adhesive layer 5 is 2 to 3 mm, the tensile shear strength of the structural adhesive is not less than 15 MPa, and the elastic modulus is 2.0 to 3.0 GPa, to ensure reliable force transmission of the reinforcement system.

[0033] In an optional embodiment, the outer surface of the two-section sleeve 2 is provided with an anti-corrosion coating and a fireproof coating, wherein the anti-corrosion coating includes a primer, an intermediate coat and a topcoat, with a total thickness of not less than 180 micrometers; the fireproof coating is an ultra-thin fireproof coating with a thickness of not less than 2 millimeters.

[0034] This invention also provides a construction method for the above-mentioned reinforced structure, comprising the following steps: Step 1: Surface Treatment of the Original Structure. The bonding surfaces of the original rods and hollow sphere joints are sandblasted to remove rust, achieving a rust removal grade of Sa2.5, with a surface roughness controlled between Ra40-80 micrometers. After cleaning, an epoxy primer is applied to enhance the adhesion between the structural adhesive and the substrate.

[0035] Step Two: Sleeve Splicing and Positioning. Attach the two sleeve halves to the outside of the original member, adjusting their position so that both ends extend to the outside of the hollow spherical node to cover the stress concentration area. After temporary fixation, weld the V-groove at the butt joint with fillet welds, ensuring the weld height is not less than 0.8 times the sleeve thickness. Perform non-destructive testing after welding to ensure weld quality. Then, install at least two clamps on the outer wall of the sleeve. By simultaneously adjusting the radial bolts and monitoring with a laser diameter gauge, control the coaxiality error between the sleeve and the original member to within 1 mm. Tighten the bolts to secure the clamps.

[0036] Step 3: Full-area grouting and curing. Using high-pressure grouting equipment, slowly inject the well-mixed structural adhesive from the lower grouting unit, controlling the grouting pressure at 10-15 MPa and maintaining a steady speed. Stop grouting when adhesive continuously overflows from the upper venting unit, and maintain a pressure of 0.5-1.0 MPa for 20-30 minutes. Cure for at least 72 hours at an ambient temperature not lower than 15℃ to ensure the adhesive layer is fully cured.

[0037] Step 4: Surface Treatment. Remove the high-pressure grouting nozzle, one-way vent valve, and clamps, etc. Seal the grouting holes and vent holes with epoxy putty and grind them smooth. After shot blasting the outer surface of the casing, spray the anti-corrosion coating and fireproof coating in sequence, ensuring a seamless connection with the original structural coating.

[0038] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0039] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0040] 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 within the protection scope of the present invention.

Claims

1. A cable supported dome structural member sleeve cooperative reinforcement structure, characterized by, The cable-supported dome space force system (1) comprises a primary rod member (11) and a hollow spherical node (12), wherein the primary rod member (11) is a hollow steel pipe and the end thereof is connected with the hollow spherical node (12) through penetration. The two-split sleeve pipe (2) comprises two semicircular pipe petals with the inner wall curvature being adapted to the outer wall of the primary rod member, the two pipe petals are butted, a welding bevel (21) is arranged at the butted edge, and the two-split sleeve pipe (2) is welded as a whole sleeve pipe through the fillet welding, and the two ends of the two-split sleeve pipe (2) extend to the outside of the hollow spherical node (12) to cover the stress concentration area. The adjustable centering device (3) comprises two half clamps (31) and a plurality of radial adjusting bolts (32) arranged uniformly in the circumferential direction, the clamps (31) are arranged axially and spaced apart along the two-split sleeve pipe (2), and the coaxiality control of the two-split sleeve pipe (2) and the primary rod member (11) is realized through the synchronous adjustment of the radial adjusting bolts (32). The global perfusion system (4) comprises a perfusion unit (42) arranged outside one end of the two-split sleeve pipe (2) and an exhaust unit (41) arranged outside one end of the sleeve pipe, the perfusion unit (42) and the exhaust unit (41) are arranged along the sleeve pipe axis, and a closed perfusion cavity is formed between the two-split sleeve pipe (2) and the cable-supported dome space force system (1). The global cementing layer (5) is formed by filling the structural glue into the gap between the two-split sleeve pipe (2) and the primary rod member (11), and an annular reinforcing glue platform (51) is formed in the abutting area of the two-split sleeve pipe (2) and the hollow spherical node (12). The welding bevel (21) of the two-split sleeve pipe (2) is a V-shaped bevel, and the welding seam height of the fillet welding is not less than 0.8 times the thickness of the two-split sleeve pipe (2).

2. The cable supported dome structural member sleeve synergistic reinforcement of claim 1, wherein: The outer end of the radial adjusting bolt (32) of the adjustable centering device (3) is provided with a scale knob, and the scale knob is matched with a laser diameter measuring instrument to control the coaxiality error of the two-split sleeve pipe (2) and the primary rod member (11) to be less than or equal to 1 mm.

3. The cable supported dome structural member steel sleeve cooperative reinforcement structure of claim 1, wherein: The inner wall of the two-split sleeve pipe (2) is provided with annular flow guide grooves (22) arranged at intervals along the length direction for guiding the uniform flow of the structural glue, and the width of the annular reinforcing glue platform (51) in the abutting area of the two-split sleeve pipe (2) and the hollow spherical node (12) is greater than the width of the glue layer in other parts.

4. The cable supported dome structural member sleeve synergistic reinforcement of claim 1, wherein: The perfusion unit (42) comprises a perfusion hole opened on the two-split sleeve pipe (2), a threaded seat fixed on the perfusion hole, and a high-pressure grouting nozzle in sealing connection with the threaded seat; and the exhaust unit (41) comprises an exhaust hole opened on the upper part of the two-split sleeve pipe (2) and a one-way exhaust valve installed on the exhaust hole.

5. The cable supported dome structural member sleeve synergistic reinforcement of claim 1, wherein: The thickness of the two-split sleeve pipe (2) is 1.2-1.5 times the wall thickness of the primary rod member (11), and the glue layer thickness of the global cementing layer (5) is 2-3 mm.

6. The cable supported dome structural member sleeve synergistic reinforcement of claim 1, wherein: The outer surface of the two-split sleeve pipe (2) is sequentially provided with an anti-corrosion coating and a fireproof coating, and the anti-corrosion coating comprises a primer, an intermediate paint and a topcoat.

7. The cable supported dome structural member sleeve synergistic reinforcement of claim 1, wherein: The method comprises the following steps:

8. A method of construction using the cable dome strut sleeve reinforcement structure according to any one of claims 1 to 7, characterised in that, ​ S1, original structure surface treatment: sandblasting and rust removal is performed on the bonding surfaces of the original bar (11) and the hollow spherical node (12), the rust removal level reaches Sa2.5 level, the surface roughness is Ra 40-80 μm, and after cleaning, epoxy primer is brushed; S2, two-part sleeve (2) splicing and positioning: the two-part sleeve is attached to the outside of the original bar (11), and the two ends extend to the outside of the hollow spherical node (12) to cover the stress concentration area, the butt edges are temporarily fixed and then welded by fillet welding, the weld height is not less than 0.8 times the thickness of the sleeve, and after welding, non-destructive testing is performed; at least two half-type clamp bodies (31) are installed on the outer wall of the two-part sleeve (2), the radial bolts (32) are adjusted synchronously, and a laser diameter measuring instrument is used for monitoring, so that the coaxiality error of the two-part sleeve (2) and the original bar (11) is ≤1mm; S3, global glue injection and curing: high-pressure grouting equipment is used to slowly inject structural glue from the pouring unit (42), and after continuous glue overflow from the exhaust unit (41), glue injection is stopped and pressure is maintained, and curing is performed for not less than 72 hours under the condition that the ambient temperature is not less than 15℃; S4, surface treatment: remove the construction device, block the pouring hole and the exhaust hole with epoxy putty, and then spray the outer surface of the two-part sleeve (2) with anticorrosive coating and fireproof coating in sequence.

Images