A structural joint of double-curved steel pipe splicing and a construction method thereof

Abstract

The application relates to a structure joint of double-curved steel pipe splicing and a construction method thereof, the joint comprising cast steel pieces containing curved sections and straight steel pipes, the cast steel pieces being distributed in column top areas and column foot areas of double-curved steel pipes to be spliced, the straight steel pipes being used for connecting adjacent cast steel pieces, and the parts of the cast steel pieces connected with the straight steel pipes being in the shape of circular truncated cones; a plurality of longitudinal stiffening ribs are radially and equally divided perpendicularly to inner walls of the straight steel pipes and used for connecting end portions of the straight steel pipes with the inner walls, the width of each longitudinal stiffening rib gradually decreases in the direction from the splicing position of the cast steel piece and the straight steel pipe to one side of the straight steel pipe; annular transverse stiffening ribs are arranged perpendicularly to the longitudinal stiffening ribs and the inner walls of the straight steel pipes and used for connecting the plurality of longitudinal stiffening ribs of the end portions of the straight steel pipes. Compared with the prior art, the application can realize the effect of special-shaped buildings and ensure the safe force transmission of the structure.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steel structure construction joints, and particularly relates to a hyperbolic steel pipe splicing structure joint and a construction method thereof. BACKGROUND

[0002] Generally, in steel structure deepening construction, there is a difference in design strength between common steel materials (such as Q355, Q390, etc.) and cast steel (such as G20MN5QT), the thickness of the cast steel part at the splicing position is twice the thickness of the steel pipe, so the method of cutting the steel pipe and welding it to the cast steel part is usually adopted. Chinese patent application 2018112282191 discloses a node stiffened intersecting welded steel pipe, which can effectively improve the stiffness and strength of the intersecting welded steel pipe node, reduce the stress concentration degree, and improve the overall carrying capacity of the node. Specifically, by setting a horizontal stiffener, the load transmission length of the branch pipe to the main pipe is increased, making the force transmission more uniform, and the in-plane stiffness of the node is increased; by setting a ring-shaped stiffener, the radial stiffness of the main pipe and the branch pipe is increased to improve the deformation resistance, and the stable carrying capacity of the horizontal stiffener is improved.

[0003] However, in the above-mentioned scheme, each stiffener is arranged on the outside of the splicing joint, which may cause stress concentration, and dynamic load may change the stress transmission path, thereby affecting the stability of the entire structure. At the same time, the above-mentioned scheme has many welds, which on the one hand increases the construction difficulty and cost, and on the other hand is not conducive to safe force transmission. In addition, in the above-mentioned scheme, the main pipe and the branch pipe are both straight steel pipes, when the steel column is a hyperbolic member, directly applying the traditional splicing joint may affect the bending quality of the member, the flatness of the cast steel and steel material butt joint position, and the welding quality of the field splicing, etc., leading to problems in force flow transmission, and even further leading to structural failure. Therefore, it is necessary to design a hyperbolic steel pipe splicing scheme to realize the effect of special-shaped building while ensuring safe force transmission of the structure. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a hyperbolic steel pipe splicing structure joint and a construction method thereof, which realizes the effect of special-shaped building while ensuring safe force transmission of the structure.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] The application provides a structural joint of spliced hyperbolic steel pipes, comprising cast steel pieces containing curved sections and straight steel pipes, the cast steel pieces are distributed in column top regions and column foot regions of the hyperbolic steel pipes to be spliced, the straight steel pipes are used to connect adjacent cast steel pieces, and the part of the cast steel piece located in the straight steel pipe is in the shape of a circular truncated cone; a plurality of longitudinal stiffening ribs are radially and equally arranged perpendicularly to the inner wall of the straight steel pipe and used to connect the end of the straight steel pipe and the inner wall, the width of each longitudinal stiffening rib gradually decreases in the direction from the joint of the cast steel piece and the straight steel pipe to the side of the straight steel pipe; a ring-shaped transverse stiffening rib is arranged perpendicularly to each longitudinal stiffening rib and the inner wall of the straight steel pipe and used to connect the plurality of longitudinal stiffening ribs connecting the end of the straight steel pipe.

[0007] Further, the transverse stiffening rib is welded by profile penetration welding.

[0008] Further, the width of the transverse stiffening rib is not less than the minimum thickness of the end of the connected cast steel piece.

[0009] Further, the number of the longitudinal stiffening ribs is even.

[0010] Further, the number of the longitudinal stiffening ribs is 8.

[0011] Further, the side of the cast steel piece close to the straight steel pipe is bevelled.

[0012] Further, when the beveling is performed, the bevel angle is 30-60°.

[0013] Further, the material of the cast steel piece is G20MN5QT cast steel.

[0014] Further, the material of the straight steel pipe is Q355 steel or Q390 steel.

[0015] The application further provides a construction method of the structural joint of spliced hyperbolic steel pipes, comprising the following steps:

[0016] S1, determining the sections according to the curvature of the hyperbolic steel pipes to be constructed, wherein the cast steel pieces containing curved sections are used in the column top regions and the column foot regions, and the straight steel pipes are used between the cast steel pieces;

[0017] S2, fitting the shape of the cast steel piece and the cross-sectional size of the straight steel pipe;

[0018] S3, according to the fitting result of step S2, the cast steel piece and the straight steel pipe are processed, and a plurality of longitudinal stiffening ribs are radially divided and welded on the inner wall of the straight steel pipe for connecting the end and the inner wall of the straight steel pipe, the width of each longitudinal stiffening rib gradually decreases in the direction from the splicing position of the cast steel piece and the straight steel pipe to one side of the straight steel pipe, and a ring-shaped transverse stiffening rib is welded perpendicular to the inner wall of the straight steel pipe and the longitudinal stiffening ribs, and is used as a sealing plate to connect the plurality of longitudinal stiffening ribs of the end of the straight steel pipe;

[0019] S4, the processed cast steel piece and the straight steel pipe are transported to the construction site, and the angle is selected according to the lofting position, and splicing and welding are performed;

[0020] S5, surface treatment, shielding the weld with thick fireproof paint, or using the method of polishing the weld to make the butt joint position smooth and transition.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1, the present application designs a structure node of double-curved steel pipe splicing, including a cast steel piece containing a curved section and a straight steel pipe, the cast steel piece is distributed in the column top area and the column foot area of the double-curved steel pipe to be spliced, the straight steel pipe is used to connect adjacent cast steel pieces, the curvature of the column top area and the column foot area is higher, and the split of the double-curved steel pipe to be spliced as described above can reduce the accumulation of welds and node processing, and ensure safe force transmission; the part of the cast steel piece located in the straight steel pipe is in the shape of a circular truncated cone, a plurality of longitudinal stiffening ribs are radially and equally divided perpendicular to the inner wall of the straight steel pipe, for connecting the end and the inner wall of the straight steel pipe, the width of each longitudinal stiffening rib gradually decreases in the direction from the splicing position of the cast steel piece and the straight steel pipe to one side of the straight steel pipe, which can gradually decrease inward to transmit force, so that the stress distribution is more uniform, thereby more effectively dispersing and resisting external load, reducing the risk of deformation and failure of the structure, and at the same time, the material consumption of the stiffening ribs can be reasonably reduced, and the material cost can be reduced; a ring-shaped transverse stiffening rib is provided perpendicular to each longitudinal stiffening rib and the inner wall of the straight steel pipe, and is used as a sealing plate to connect the plurality of longitudinal stiffening ribs of the end of the straight steel pipe, which can simultaneously make the force flow pass through multiple directions for transmission, further ensuring the safety and reliability of the structure.

[0023] 2, in the present application, the width of the transverse stiffening rib is not less than the minimum thickness of the connected cast steel piece end, which can ensure that the connection of the straight steel pipe and the cast steel piece is more firm, and the stress is more effectively dispersed and transmitted, which helps to reduce the structural fatigue and damage caused by stress concentration, and improves the durability and safety of the structure.

[0024] 3、The side of the cast steel part close to the straight steel pipe is beveled in the application, which can effectively release the stress inside the material, avoid stress concentration leading to material deformation or cracks, ensure the stability and fatigue strength of the workpiece, effectively remove the sharp edges and burrs of the cast steel part, reduce the construction risk, reduce the friction resistance in the assembly process, and improve the assembly efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a longitudinal sectional view of the splicing structure node;

[0026] Figure 2 is a transverse sectional view of the splicing structure node;

[0027] Figure 3 is a schematic diagram of a reticulated shell structure system;

[0028] Figure 4 is a schematic diagram of the position of the cast steel part and the steel pipe;

[0029] Figure 5 is a schematic diagram of the calculation results of the splicing structure node,

[0030] wherein (5a) is a stress cloud Figure 1 (Mpa), (5b) is a stress cloud Figure 2 (Mpa), and (5c) is a displacement cloud diagram;

[0031] Reference signs: 001, cast steel part; 002, straight steel pipe; 003, longitudinal stiffening rib; 004, transverse stiffening rib. DETAILED DESCRIPTION

[0032] The application will be described in detail below in combination with the drawings and specific embodiments. The embodiments are implemented on the premise of the technical solution of the application, and detailed implementation modes and specific operation processes are given, but the protection scope of the application is not limited to the following embodiments.

[0033] Embodiment 1

[0034] The embodiment provides a splicing structure node of hyperbolic steel pipes, which is suitable for a large-span single-layer reticulated shell structure as shown in the drawings. Figure 3 The reticulated shell structure is composed of special-shaped ribbon columns, edge sealing beams, and grid beams, the long axis direction of the reticulated shell structure is 119 m long, the short axis direction is 52 m wide, and the height is 22 m. The ribbon column is in a spatial hyperbolic shape, the top is connected with the edge sealing beam and each grid beam, and the column top component is complex; if the straight steel pipe is used to connect the two sides of the ribbon column, it is difficult to effectively transmit force to the column foot, therefore, as shown in the drawings, Figure 4As shown, in the area with large curvature, such as excessive corner, column top and column foot area, cast steel parts with curved sections are used to reduce the accumulation of welds and ensure safe force transmission; in the position with low curvature between cast steel parts, or the position where the double curved rod part shape fits close to the straight pipe, the column body is less stressed and the node processing is less, and steel pipe is used as the column component.

[0035] As shown in the Figure 1 The splicing structure node provided by the embodiment includes a cast steel part 001 (the material can be G20MN5QT cast steel) and a straight steel pipe 002 (the material can be Q355 steel or Q390 steel). The straight steel pipe 002 is used to sleeve the adjacent cast steel part 001, and the part of the cast steel part 001 located in the straight steel pipe 002 is in the shape of a circular truncated cone. A plurality of longitudinal stiffening ribs 003 are radially and equally arranged perpendicular to the inner wall of the straight steel pipe 002, and are used to connect the end of the straight steel pipe 002 and the inner wall of the straight steel pipe 002. The width of each longitudinal stiffening rib 003 gradually decreases in the direction from the splicing position of the cast steel part 001 and the straight steel pipe 002 to the side of the straight steel pipe 002. Such design can gradually transmit force inwardly, so that the stress distribution is more uniform, thereby more effectively dispersing and resisting external load, reducing the risk of deformation and failure of the structure, and at the same time, the material consumption of the stiffening rib can be reasonably reduced, and the material cost can be reduced.

[0036] As shown in the Figure 2 A ring-shaped transverse stiffening rib 004 is arranged perpendicular to the inner wall of each longitudinal stiffening rib 003 and the straight steel pipe 002, and is used to connect the plurality of longitudinal stiffening ribs 003 at the end of the straight steel pipe 002. The width of the transverse stiffening rib 004 is not less than the minimum thickness of the end of the connected cast steel part 001, and the transverse stiffening rib 004 is welded by profile penetration welding and cooperates with the straight steel pipe 002 to bear force, so that the force flow can be transmitted in multiple directions at the same time, further ensuring the safety and reliability of the structure.

[0037] In a preferred embodiment, the cast steel part 001 is beveled on the side close to the straight steel pipe 002, and the bevel angle is 30°-60°. On the one hand, the stress inside the material can be effectively released, the stress concentration can be avoided to cause material deformation or cracks, the stability and fatigue strength of the workpiece can be ensured, and on the other hand, the sharp edges and burrs of the cast steel part can be effectively removed, the construction risk can be reduced, the frictional resistance in the assembly process can be reduced, and the assembly efficiency can be improved.

[0038] This embodiment involved modeling and simulation experiments in the software. The specific parameter settings are as follows: The ribbon column has a variable cross-section of an 800mm diameter circular tube. One side of the joint is a gradually changing hyperbolic cast steel component with a minimum end wall thickness of 60mm, and some column base cast steel ends have a wall thickness of 80mm. The other side is a hyperbolic straight-seam steel pipe with a wall thickness of 30mm. Eight 30mm thick longitudinal stiffeners with a width gradually decreasing from 100mm to 50mm are installed at the joint. A 40mm thick, 800mm long transverse stiffener is welded to the end, ensuring the width of the stiffeners is greater than the minimum thickness of the adjacent cast steel component ends. The simulation calculation results are as follows: Figure 5 As shown, (5a) and (5b) represent the nodal stress diagrams under the most unfavorable stress combination. After setting up eight longitudinal transition plates, each 30mm thick and 800mm long, with a width varying from 100mm to 50mm, the force flow can be safely and evenly transferred from the thick cast steel to the central steel pipe. The maximum stress in the cast steel part at the nodal splice position is 154MPa, which is far less than the requirements for cast steel. The maximum stress in the steel plate at the splice position is 298MPa, and the maximum stress in the steel pipe behind the round pipe transition section is 384MPa, both of which are less than the requirements for Q390 steel pipe. This connection node is safe and reliable. (5c) represents the deformation of the splice node, with a deformation value of 2mm. The deformation value and deformation trend are consistent with the overall model. Based on the above analysis, this node is safe and reliable, and meets the force transmission requirements of the cast steel and steel pipe positions.

[0039] Example 2

[0040] This embodiment provides a construction method for a hyperbolic steel pipe splicing structural node as described in Embodiment 1. The specific steps are as follows:

[0041] S1. Determine the segmentation based on the curvature of the hyperbolic steel pipe to be constructed, and confirm the construction scope of each segment.

[0042] The sections with greater curvature (excessive corners, or areas with many joints such as column tops and column bases) are machined from cast steel to reduce weld accumulation and ensure safe force transmission; the sections with less curvature (between cast steel parts, or where the shape of hyperbolic rods is close to that of a straight pipe) are machined from straight sections of steel pipe.

[0043] S2. Fit the shape of the cast steel part according to the hyperbolic circular tube model provided by Rhino. The straight section of the steel tube is replaced by a single curve to represent a hyperbolic curve, and the fitting is performed according to the cross-sectional changes.

[0044] S3. Based on the fitting results of step S2, the factory casts steel part 001 and performs related processing. According to the fitted steel pipe shape, straight steel pipe 002 is processed. Eight longitudinal stiffening ribs 003 with a width gradually changing from 100mm to 50mm are radially and equally welded on the inner wall of the straight steel pipe 002. Perpendicular to each longitudinal stiffening rib 003 and the inner wall of the straight steel pipe 002, a 40mm thick annular transverse stiffening rib 004 is welded.

[0045] S4, the finished cast steel casting 001 and straight steel pipe 002 are transported to the construction site, according to the location of the layout of the installation angle, the split welding is carried out, and the full support is provided. After the whole splicing, the first level of welding joint is spliced.

[0046] S5, after the splicing welding is completed, the splicing structure is coated with fireproof / corrosion resistant paint, the putty is batched, the welding joint is shielded, or the polishing welding joint method is adopted, the splicing position is smoothly transitioned, and the building effect is guaranteed.

[0047] The above description of the embodiments is to facilitate the understanding and use of the invention by ordinary skilled persons in the art. Those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present application is not limited to the above embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the present application without departing from the scope of the present application should be within the scope of protection of the present application.

Claims

1. A structural joint for splicing hyperbolic steel pipes, characterized in that, The system includes a cast steel component (001) with curved sections and a straight steel pipe (002). The cast steel component (001) is distributed in the column top and column base areas of the hyperbolic steel pipe. The straight steel pipe (002) is used to connect adjacent cast steel components (001). The portion of the cast steel component (001) located inside the straight steel pipe (002) is frustum-shaped. Multiple longitudinal stiffening ribs (003) are radially and equally distributed on the inner wall of the straight steel pipe (002) for connecting the straight steel pipe. The width of each longitudinal stiffening rib (003) at the end and inner wall of the pipe (002) gradually decreases in the direction from the splice of the cast steel part (001) and the straight steel pipe (002) toward the side of the straight steel pipe (002); a ring-shaped transverse stiffening rib (004) is provided perpendicular to each longitudinal stiffening rib (003) and the inner wall of the straight steel pipe (002) as a sealing plate connecting the multiple longitudinal stiffening ribs (003) at the end of the straight steel pipe (002).

2. The structural node for splicing hyperbolic steel pipes according to claim 1, characterized in that, The transverse stiffening rib (004) is welded by slit penetration welding.

3. The structural node for splicing hyperbolic steel pipes according to claim 1, characterized in that, The width of the transverse stiffening rib (004) is not less than the minimum thickness of the end of the connected cast steel part (001).

4. The structural node for splicing hyperbolic steel pipes according to claim 1, characterized in that, The number of the longitudinal stiffening ribs (003) is even.

5. The structural node for splicing hyperbolic steel pipes according to claim 4, characterized in that, The number of longitudinal stiffening ribs (003) is 8.

6. The structural node for splicing hyperbolic steel pipes according to claim 1, characterized in that, The side of the cast steel part (001) near the straight steel pipe (002) is beveled.

7. A structural node for splicing hyperbolic steel pipes according to claim 6, characterized in that, When performing beveling, the beveling angle should be between 30° and 60°.

8. The structural node for splicing hyperbolic steel pipes according to claim 1, characterized in that, The material of the cast steel part (001) is G20MN5QT cast steel.

9. The structural node for splicing hyperbolic steel pipes according to claim 1, characterized in that, The material of the straight steel pipe (002) is Q355 steel or Q390 steel.

10. A construction method for a structural joint of hyperbolic steel pipe splicing, characterized in that, Includes the following steps: S1. Determine the segmentation based on the curvature of the hyperbolic steel pipe to be constructed. Cast steel parts (001) with curved segments are used in the column top area and column base area, and straight steel pipes (002) are used between each cast steel part (001). S2. Fit the shape of the cast steel part (001) and the cross-sectional dimensions of the straight steel pipe (002); S3. Based on the fitting results of step S2, a cast steel part (001) and a straight steel pipe (002) are processed and obtained. Multiple longitudinal stiffening ribs (003) are radially and equally divided on the inner wall of the straight steel pipe (002) to connect the end of the straight steel pipe (002) with the inner wall. The width of each longitudinal stiffening rib (003) gradually decreases in the direction from the splice of the cast steel part (001) and the straight steel pipe (002) to the side of the straight steel pipe (002). The width is perpendicular to each longitudinal stiffening rib (003) and the inner wall of the straight steel pipe (002). A ring-shaped transverse stiffening rib (004) is welded to serve as a sealing plate to connect the multiple longitudinal stiffening ribs (003) at the end of the straight steel pipe (002). S4. Transport the processed cast steel parts (001) and straight steel pipes (002) to the construction site, select the installation angle according to the layout position, and perform splicing and welding. S5. Surface treatment: Use thick fire-retardant coating to cover the weld seam, or use the method of grinding the weld seam to make the joint smooth transition.

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