Method for assembling steel pipe with cross inner support

Abstract

The application provides a steel pipe assembling method with a cross inner support, and relates to the field of steel pipe tower construction, and comprises the following steps: S1, placing an ellipticity-corrected steel pipe on an assembling platform; S2, installing a ring-shaped guide frame at one end of the steel pipe, and arranging the ring-shaped guide frame coaxially with the steel pipe, wherein the ring-shaped guide frame has a cross guide channel extending along the radial direction thereof; S3, making one end of the cross inner support pass through the cross guide channel to be inserted into the steel pipe; S4, removing the ring-shaped guide frame, and welding the cross inner support and the steel pipe. The ellipticity-corrected steel pipe makes the cross inner support be inserted into the steel pipe more smoothly; meanwhile, the ring-shaped guide frame is arranged at one end of the steel pipe, the cross inner support is guided by the cross guide channel of the ring-shaped guide frame, the cross inner support is arranged coaxially with the steel pipe along the radial direction of the steel pipe, and local hard points caused by the cross inner support deviating from the pipe axis are avoided, so that the overall stress is more uniform.

Description

Technical Field

[0001] This invention relates to the field of steel pipe tower construction, and more specifically, to a method for assembling steel pipes with cross-shaped internal supports. Background Technology

[0002] In steel pipe tower structures, the tower-beam joint section, as a key node bearing complex loads, usually needs to have extremely high local stability and resistance to deformation. Currently, in order to locally strengthen this area, a common approach is to install a cross-shaped continuous internal bracing structure inside the circular steel pipe. This cross-shaped internal bracing structure is welded together from two mutually perpendicular steel plates, with its outer edge tightly fitted to the inner wall of the steel pipe. It can convert radial loads into compressive stress on the support plate, thereby providing strong inward support force for the steel pipe and effectively preventing local buckling of the tower-beam joint section under stress.

[0003] In related technologies, there are some difficulties in assembling the cross inner brace with the steel pipe: on the one hand, due to the inevitable roundness deviation of the steel pipe during rolling, transportation or welding, the cross inner brace cannot be smoothly inserted into the steel pipe, making the assembly difficult and the assembly efficiency low; on the other hand, when the cross inner brace is inserted into the steel pipe, it deviates from the axis of the steel pipe under the action of gravity, which easily forms local hard points, resulting in uneven overall stress. Summary of the Invention

[0004] The problem solved by this invention is: how to prevent the cross-shaped inner brace from deviating from the axis of the steel pipe while ensuring the smooth assembly of the cross-shaped inner brace and the steel pipe.

[0005] To address the above problems, this invention provides a method for assembling steel pipes with cross-shaped internal supports, comprising the following steps: S1. Place the steel pipe that has been corrected for ellipticity on the assembly platform; S2: Install the annular guide frame at one end of the steel pipe and make the annular guide frame coaxial with the steel pipe, wherein the annular guide frame has a cross guide channel extending radially therein; S3: Pass one end of the cross inner support through the cross guide channel to insert it into the steel pipe; S4: Remove the annular guide frame and weld the cross inner support and the steel pipe.

[0006] Optionally, the assembly platform includes a bottom pad, a reaction frame, hydraulic rods, and side pads. Two reaction frames are arranged opposite each other on both sides of the bottom pad. Each reaction frame has a corresponding hydraulic rod installed on the side closest to the other reaction frame. The hydraulic rods are connected to the side pads. In step S1, placing the rounded steel pipe on the assembly platform includes the following steps: placing the steel pipe on the bottom pad, and the hydraulic rods on both sides driving the corresponding side pads to move towards each other, so that the two side pads are respectively close to the sides of the steel pipe.

[0007] Optionally, the upper surface of the bottom pad is provided with a first arc-shaped surface for matching the shape of the steel pipe, and the sides of the two lateral pads that are close to each other are respectively provided with a second arc-shaped surface for matching the shape of the steel pipe.

[0008] Optionally, the annular guide frame includes an annular base and measuring and fastening devices. The radial dimension of the annular base is smaller than the radial dimension of the steel pipe. The annular base has the cross guide channel, and the measuring and fastening devices are respectively provided at the four ports of the cross guide channel. In step S, installing the annular guide frame at one end of the steel pipe and making the annular guide frame coaxial with the steel pipe includes the following steps: installing the annular base at one end of the steel pipe, and using the four measuring and fastening devices to detect the distance between the four ports of the cross guide channel of the annular base and the inner wall of the steel pipe, and fixing the annular base to the steel pipe when the detected distances are all equal.

[0009] Optionally, the annular base includes fan-shaped seats, and four fan-shaped seats are arranged at intervals to form the cross guide channel. Each fan-shaped seat has a positioning groove near the edge of the adjacent fan-shaped seat. The measuring and fastening device is located between two adjacent fan-shaped seats. The measuring and fastening device includes a mounting plate and two positioning blocks on the mounting plate. The two positioning blocks of the measuring and fastening device are respectively inserted into the positioning grooves of the two adjacent fan-shaped seats. The mounting plate of the measuring and fastening device is connected to the two adjacent fan-shaped seats by two fasteners. A through hole communicating with the cross guide channel is provided between the two positioning blocks of the mounting plate so that the cross inner support can pass through.

[0010] Optionally, the measuring and fastening device further includes a lead screw and a locking nut. One end of the mounting plate is provided with the positioning block, and the other end of the mounting plate extends radially outward from the steel pipe along the annular base and is bent to form a connecting part. The lead screw extends radially along the annular base, and one end of the lead screw passes through the connecting part and abuts against the outer wall of the steel pipe. The locking nut is used to lock the lead screw to the connecting part.

[0011] Optionally, the measuring fastening device further includes a scale disposed on the mounting plate and extending radially along the annular base, the scale being used to measure the distance between the annular base and the steel pipe.

[0012] Optionally, the annular base further includes rollers. The cross guide channel of the annular base includes intersecting horizontal and vertical channels. Rollers are provided on the lower sidewall of the horizontal channel. The rollers are liftable rollers and multiple rollers are spaced apart along the extension direction of the horizontal channel. The rollers are used to contact the corresponding wing plates of the cross inner support.

[0013] Optionally, in step S3, before one end of the cross inner support passes through the cross guide channel, a cross conical guide head is installed on the cross inner support, and the cross conical guide head is used to guide the cross inner support into the cross guide channel; in step S4, the cross conical guide head is removed when the annular guide frame is removed.

[0014] Optionally, in step S4, when welding the inner cross brace and the steel pipe, the welding is performed in a symmetrical sequence.

[0015] The advantages of the steel pipe assembly method with cross-shaped inner supports of the present invention compared with related technologies include, but are not limited to: using steel pipes with ellipticity correction, that is, the roundness of the steel pipe itself is more uniform, so that the cross-shaped inner supports can be inserted into the steel pipe more smoothly; at the same time, an annular guide frame is set at one end of the steel pipe, and the cross-shaped guide channel of the annular guide frame guides the cross-shaped inner supports. Since the cross-shaped guide channel extends radially along the annular guide frame, and the annular guide frame is coaxial with the steel pipe, that is, the cross-shaped guide channel extends radially along the steel pipe, thereby ensuring that the cross-shaped inner supports in the cross-shaped guide channel extend radially along the steel pipe and are set coaxially with the steel pipe, avoiding the formation of local hard points due to the cross-shaped inner supports deviating from the axis of the steel pipe, and making the overall stress more uniform; in addition, after the cross-shaped inner supports are inserted into the steel pipe, the annular guide frame can be removed, which makes it easy to weld the cross-shaped inner supports to the steel pipe, and the annular guide frame can be reused multiple times after removal, reducing assembly costs. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the steel pipe assembly method with cross-shaped internal bracing according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the steel pipe placed on the assembly platform according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the annular guide frame according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the annular guide frame mounted on the steel pipe according to an embodiment of the present invention; Figure 5 for Figure 4 Structural diagram of the installation of the cross-shaped internal brace; Figure 6 This is a schematic diagram of the structure after the cross-shaped inner brace and steel pipe are assembled according to an embodiment of the present invention; Figure 7 This is a structural schematic diagram from another perspective after the cross-shaped inner brace and steel pipe are assembled according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Steel pipe; 2. Cross inner brace; 21. Wing plate; 3. Assembly platform; 31. Bottom pad; 311. First arc surface; 32. Reaction frame; 33. Hydraulic rod; 34. Lateral pad; 341. Second arc surface; 4. Annular guide frame; 41. Annular base; 411. Fan-shaped seat; 412. Cross guide channel; 413. Positioning groove; 414. Roller; 42. Measuring and fastening device; 421. Mounting plate; 422. Positioning block; 423. Screw; 424. Locking nut; 425. Ruler; 43. Fastener. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] In the accompanying drawings, the Z-axis represents the vertical position, with the positive direction of the Z-axis representing upward and the negative direction representing downward. It should be noted that the aforementioned representation of the Z-axis is merely for the convenience of describing the invention and for simplification, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation of the invention.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] like Figure 1 As shown in the figure, an embodiment of the present invention provides a method for assembling steel pipes with cross-shaped internal supports, comprising the following steps: S1. Place the steel pipe 1, which has been corrected for ellipticity, on the assembly platform 3, such as... Figure 2 As shown.

[0023] Here, steel pipe 1 is a circular steel pipe, which can be manufactured according to the straight seam steel pipe manufacturing process and welded; the assembly platform 3 provides the assembly foundation for steel pipe 1 and cross inner support 2. The steel pipe 1, which has been corrected for ellipticity, is placed on the assembly platform 3, that is, the roundness of steel pipe 1 is relatively uniform, so that cross inner support 2 can be inserted into steel pipe 1 relatively smoothly.

[0024] S2: Install the annular guide frame 4 at one end of the steel pipe 1, and arrange the annular guide frame 4 coaxially with the steel pipe 1, wherein the annular guide frame 4 has a cross guide channel 412 extending radially therein, such as... Figures 3-4 As shown.

[0025] Before S2, the end face of the steel pipe 1 can be repaired and smoothed, and burrs and welding slag can be removed. The annular guide frame 4 can be assembled from multiple parts. The cross guide channel 412 matches the shape of the cross inner support 2. The annular guide frame 4 is installed at one end of the steel pipe 1. The cross guide channel 412 of the annular guide frame 4 can guide the cross inner support 2. Since the cross guide channel 412 extends radially along the annular guide frame 4, the annular guide frame 4 is coaxial with the steel pipe 1. That is, the cross guide channel 412 extends radially along the steel pipe 1, thereby ensuring that the cross inner support 2 in the cross guide channel 412 extends radially along the steel pipe 1 and is coaxially set with the steel pipe 1. This avoids the formation of local hard points due to the cross inner support 2 deviating from the axis of the steel pipe 1, making the overall force more uniform.

[0026] S3: Pass one end of the cross inner support 2 through the cross guide channel 412 to insert it into the steel pipe 1, such as... Figure 5 As shown.

[0027] Here, a crane can be used to lift the inner cross brace 2, and the insertion end of the inner cross brace 2 can be slowly brought close to the cross guide channel 412 of the annular guide frame 4, so that the axis of the inner cross brace 2 is slightly tilted 1-2° relative to the axis of the steel pipe 1. The rope is slowly released, and the inner cross brace 2 slides into the cross guide channel 412 under the action of gravity, and enters the steel pipe 1 along the cross guide channel 412.

[0028] S4: Remove the annular guide frame 4, and weld the cross inner support 2 and the steel pipe 1, as follows. Figures 6-7 As shown.

[0029] Here, after the cross inner support 2 is inserted into the steel pipe 1, the annular guide frame 4 is removed, which makes it easy to weld the cross inner support 2 to the steel pipe 1. Moreover, the annular guide frame 4 can be reused multiple times after removal, reducing assembly costs.

[0030] like Figure 2 As shown, optionally, the assembly platform 3 includes a bottom pad 31, a reaction frame 32, a hydraulic rod 33, and a side pad 34. Two reaction frames 32 are arranged opposite each other on both sides of the bottom pad 31. Each reaction frame 32 has a corresponding hydraulic rod 33 installed on the side closer to the other reaction frame 32. The hydraulic rod 33 is connected to the side pad 34. In step S1, placing the rounded steel pipe 1 on the assembly platform 3 includes the following steps: placing the steel pipe 1 on the bottom pad 31, and the hydraulic rods 33 on both sides drive the corresponding side pads 34 to move towards each other, so that the two side pads 34 are respectively close to the two sides of the steel pipe 1.

[0031] It should be noted that after the ellipticity of the steel pipe 1 is calibrated, it may undergo some deformation during transportation, which may affect the installation of the cross inner support 2. Therefore, a special assembly platform 3 needs to be designed. The bottom pad 31 is used to support the steel pipe 1. The reaction frame 32, hydraulic rod 33 and lateral pad 34 constitute the top tightening and correction system.

[0032] The steel pipe 1 is placed on the bottom pad 31 of the assembly platform 3. The hydraulic rods 33 of the clamping and straightening system on both sides drive the corresponding lateral pads 34 to move so that the two lateral pads 34 are pressed against the two sides of the steel pipe 1. By controlling the pressure of the hydraulic rods 33, the steel pipe 1 undergoes a slight deformation to counteract the effect of the deformation of the steel pipe 1 on the installation of the cross inner support 2.

[0033] like Figure 2As shown, optionally, the upper surface of the bottom pad 31 is provided with a first arc-shaped surface 311 for matching the shape of the steel pipe 1, and the two side pads 34 are respectively provided with a second arc-shaped surface 341 for matching the shape of the steel pipe 1 on their sides that are close to each other.

[0034] Here, the upper surface of the bottom pad 31, that is, the side facing the positive Z-axis, is provided with a first arc-shaped surface 311. The first arc-shaped surface 311 matches the shape of the steel pipe 1. After the steel pipe 1 is placed on the bottom pad 31, the first arc-shaped surface 311 of the bottom pad 31 can limit the steel pipe 1 and prevent the steel pipe 1 from rolling off the bottom pad 31. Moreover, the bottom pad 31 increases its contact area with the steel pipe 1 through the first arc-shaped surface 311, which can provide more stable support for the steel pipe 1.

[0035] The two lateral pads 34 have a second arc-shaped surface 341 on their facing sides. When the two hydraulic rods 33 drive the corresponding lateral pads 34 to move closer to each other, the second arc-shaped surfaces 341 of the two lateral pads 34 respectively fit against the left and right side walls of the steel pipe 1, increasing the contact area between the lateral pads 34 and the steel pipe 1 and improving the clamping stability of the two lateral pads 34 on the steel pipe 1. In addition, when the hydraulic rods 33 drive the lateral pads 34 to move, the size of the gap between the lateral pads 34 and the steel pipe 1 can be used as a basis for adjusting the hydraulic force to prevent overload or insufficient clamping.

[0036] like Figures 3-5 As shown, optionally, the annular guide frame 4 includes an annular base 41 and measuring fastening devices 42. The radial dimension of the annular base 41 is smaller than the radial dimension of the steel pipe 1. The annular base 41 has a cross guide channel 412 extending radially therein. The annular base 41 is provided with the measuring fastening devices 42 at the four ports of the cross guide channel 412. In step S2, the step of installing the annular guide frame 4 at one end of the steel pipe 1 and making the annular guide frame 4 coaxial with the steel pipe 1 includes the following steps: installing the annular base 41 at one end of the steel pipe 1, and using the four measuring fastening devices 42 to detect the distance between the four ports of the cross guide channel 412 of the annular base 41 and the inner wall of the steel pipe 1, and fixing the annular base 41 to the steel pipe 1 when the detected distances are all equal.

[0037] Specifically, the annular base 41 can be integrally formed or it can be a split type. The radial dimension of the annular base 41 is smaller than the radial dimension of the steel pipe 1, which means that the outer diameter of the annular base 41 is smaller than the outer diameter of the steel pipe 1. The annular base 41 has a cross guide channel 412 extending radially along it. The cross guide channel 412 has four ports. Four measuring fastening devices 42 are provided. The four measuring fastening devices 42 are respectively located at the four ports. The measuring fastening devices 42 can not only be used to measure the radial distance between the corresponding position of the annular base 41 and the steel pipe 1, but also to fix the annular base 41 and the steel pipe 1 together.

[0038] Here, if the radial distances between the four ports of the cross guide channel 412 of the annular base 41 and the inner wall of the steel pipe 1 detected by the four measuring and fastening devices 42 are not equal, the annular base 41 is moved radially along the annular base 41. More precisely, the annular base 41 can be moved along the direction of the horizontal channel and / or vertical channel of the cross guide channel 412 until the radial distances measured by the four measuring and fastening devices 42 are all equal. Then, the movement is stopped, and the annular base 41 is fixed to the steel pipe 1, thereby achieving the coaxial setting of the annular base 41 and the steel pipe 1.

[0039] like Figures 3-5 As shown, optionally, the annular base 41 includes a fan-shaped base 411, four fan-shaped bases 411 are arranged at intervals to form the cross guide channel 412, each fan-shaped base 411 has a positioning groove 413 near the edge of the adjacent fan-shaped base 411, the measuring fastening device 42 is located between two adjacent fan-shaped bases 411, the measuring fastening device 42 includes a mounting plate 421 and two positioning blocks 422 provided on the mounting plate 421, the two positioning blocks 422 of the measuring fastening device 42 are respectively inserted into the positioning grooves 413 of the two adjacent fan-shaped bases 411, the mounting plate 421 of the measuring fastening device 42 is connected to the two adjacent fan-shaped bases 411 by two fasteners 43, and a through hole communicating with the cross guide channel 412 is provided between the two positioning blocks 422 of the mounting plate 421 so that the cross inner support 2 can pass through.

[0040] Here, the four sector-shaped bases 411 are basically the same in shape. Each sector-shaped base 411 includes an arc segment and an L-shaped connecting rib. The central angle corresponding to the arc segment is approximately 90°. The two ends of the L-shaped connecting rib are connected to the two ends of the arc segment. The four sector-shaped bases 411 are arranged in a circular pattern with intervals. The gaps between the four sector-shaped bases 411 form a cross-shaped guide channel 412. The two ends of the arc segment of each sector-shaped base 411 are provided with positioning grooves 413. The positioning grooves 413 extend radially along the annular base 41. Mounting plate 4 The 21 has positioning blocks 422 that match the positioning grooves 413. Two positioning blocks 422 of each measuring fastening device 42 are respectively inserted into the positioning grooves 413 of two adjacent sector seats 411 to achieve positioning assembly between the four sector seats 411 and the four measuring fastening devices 42. Then, multiple fasteners 43 are used to pass through the corresponding mounting plates 421 and sector seats 411 to achieve a fixed connection between the four sector seats 411 and the four measuring fastening devices 42, making them a single unit. Here, the fasteners 43 can be bolts.

[0041] A through hole is provided between the two positioning blocks 422 of the mounting plate 421, which communicates with the cross guide channel 412. The through hole is elongated and can penetrate one end of the mounting plate 421 toward the inside of the annular base 41. In this way, it is ensured that the cross inner support 2 can pass through the through hole and be inserted into the cross guide channel 412.

[0042] It should be noted that a positioning block 422 can also be set on the sector-shaped base 411, and a positioning groove 413 can be set on the mounting plate 421 of the measuring fastening device 42. The positioning principle is similar to that described above and will not be repeated.

[0043] like Figures 3-4 As shown, optionally, the measuring and fastening device 42 further includes a lead screw 423 and a locking nut 424. One end of the mounting plate 421 is provided with the positioning block 422, and the other end of the mounting plate 421 extends radially outward from the steel pipe 1 along the annular base 41 and is bent to form a connecting part. The lead screw 423 extends radially along the annular base 41, and one end of the lead screw 423 passes through the connecting part and abuts against the outer wall of the steel pipe 1. The locking nut 424 is used to lock the lead screw 423 to the connecting part.

[0044] Specifically, the mounting plate 421 can be L-shaped, including a plate body extending radially along the annular base 41 and a connecting part extending along the axis parallel to the annular base 41. The plate body is provided with a positioning block 422. The connecting part is located outside the steel pipe 1 and is provided with a threaded hole. One end of the screw 423 passes through the threaded hole and abuts against the outer wall of the steel pipe 1. Rotating the screw 423 can push the whole consisting of the mounting plate 421 and the annular base 41 to move radially along the steel pipe 1, thereby realizing the adjustment of the relative position between the annular base 41 and the steel pipe 1, which facilitates the concentric setting of the two. After the adjustment is in place, the screw 423 and the mounting plate 421 can be locked with the locking nut 424.

[0045] like Figures 3-4 As shown, optionally, the measuring and fastening device 42 further includes a scale 425, which is disposed on the mounting plate 421 and extends radially along the annular base 41. The scale 425 is used to measure the distance between the annular base 41 and the steel pipe 1. Here, the scale 425 can be a ruler fixed on the mounting plate 421 or a scale line drawn on the mounting plate 421. The scale 425 extends radially along the annular base 41, and the corresponding scales on the outer wall of the annular base 41 and the inner wall of the steel pipe 1 are directly read. The radial distance between the annular base 41 and the steel pipe 1 can be obtained by subtracting the scales. The measurement is simple and convenient.

[0046] like Figures 3-5 As shown, optionally, the annular base 41 further includes rollers 414. The cross guide channel 412 of the annular base 41 includes intersecting horizontal channels and vertical channels. Rollers 414 are provided on the lower side wall of the horizontal channel. The rollers 414 are liftable rollers and are arranged in multiple intervals along the extension direction of the horizontal channel. The rollers 414 are used to contact the corresponding wing plates 21 of the cross inner support 2.

[0047] Specifically, the cross inner support 2 has four mutually perpendicularly connected wing plates 21, and the roller 414 is rotatably set on the lower side wall of the horizontal channel of the cross guide channel 412. When the cross inner support 2 is inserted into the cross guide channel 412, the roller 414 makes line contact with the corresponding wing plate 21 of the cross inner support 2. The roller 414 rotates as the cross inner support 2 is continuously pushed forward, changing the sliding friction into rolling friction, guiding the cross inner support 2 to move smoothly along the axial direction of the steel pipe 1, and improving the assembly efficiency.

[0048] Optionally, in step S3, before one end of the inner cross brace 2 passes through the cross guide channel 412, a cross cone guide head is installed on the inner cross brace 2, and the inner cross brace 2 is guided into the cross guide channel 412 by the cross cone guide head; in step S4, the cross cone guide head is removed when the annular guide frame 4 is removed.

[0049] Specifically, the cross-shaped conical guide head is detachably connected to the insertion end of the cross inner support 2, and the cross direction of the cross-shaped conical guide head is the same as the cross direction of the cross inner support 2. Under the guidance of the cross-shaped conical guide head, the cross inner support 2 can smoothly slide into the cross guide channel 412, improving the assembly efficiency between the cross inner support 2 and the steel pipe 1. Moreover, the cross-shaped conical guide head is detachably connected to the cross inner support 2. After the cross inner support 2 is assembled in place, the cross-shaped conical guide head can be removed from the cross inner support 2 and reused.

[0050] Optionally, in step S4, when welding the cross inner support 2 and the steel pipe 1, the welding is performed in a symmetrical sequence.

[0051] Specifically, the cross inner brace 2 has four flanges 21: upper, lower, left, and right. For example, first weld the middle section of the upper flange connecting to the steel pipe 1, then weld the middle section of the lower flange connecting to the steel pipe 1, then weld the middle section of the left flange connecting to the steel pipe 1, then weld the middle section of the right flange connecting to the steel pipe 1, and repeat the above process to gradually lengthen the weld. Each time, a small section is welded in turn and synchronously in the four directions of upper, lower, left, and right. Each contraction is offset by the contraction force on the opposite side. In this way, it can be ensured that the cross inner brace 2 is always coaxially set with the steel pipe 1, and the steel pipe 1 will not bend or deform.

[0052] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for assembling steel pipes with cross-shaped internal supports, characterized in that, Includes the following steps: S1. Place the steel pipe (1) that has been corrected for ellipticity on the assembly platform (3); S2: Install the annular guide frame (4) at one end of the steel pipe (1) and make the annular guide frame (4) coaxial with the steel pipe (1), wherein the annular guide frame (4) has a cross guide channel (412) extending radially therein. S3: Pass one end of the cross inner support (2) through the cross guide channel (412) to insert it into the steel pipe (1); S4: Remove the annular guide frame (4) and weld the cross inner support (2) and the steel pipe (1).

2. The method for assembling steel pipes with cross-shaped internal supports according to claim 1, characterized in that, The assembly platform (3) includes a bottom pad (31), a reaction frame (32), a hydraulic rod (33), and a side pad (34). Two reaction frames (32) are arranged opposite to each other on both sides of the bottom pad (31). Each reaction frame (32) has a corresponding hydraulic rod (33) installed on the side closer to the other reaction frame (32). The hydraulic rod (33) is connected to the side pad (34). In S1, placing the round steel pipe (1) on the assembly platform (3) includes the following steps: placing the steel pipe (1) on the bottom pad (31), and driving the corresponding side pads (34) on both sides to move towards each other, so that the two side pads (34) are respectively close to the two sides of the steel pipe (1).

3. The method for assembling steel pipes with cross-shaped internal supports according to claim 2, characterized in that, The upper surface of the bottom pad (31) is provided with a first arc-shaped surface (311) for matching the shape of the steel pipe (1), and the two side pads (34) are respectively provided with a second arc-shaped surface (341) for matching the shape of the steel pipe (1) on their sides that are close to each other.

4. The method for assembling steel pipes with cross-shaped internal supports according to claim 1, characterized in that, The annular guide frame (4) includes an annular base (41) and measuring fastening devices (42). The radial dimension of the annular base (41) is smaller than that of the steel pipe (1). The annular base (41) has the cross guide channel (412). The annular base (41) is provided with the measuring fastening devices (42) at the four ports of the cross guide channel (412). In S2, the step of installing the annular guide frame (4) at one end of the steel pipe (1) and setting the annular guide frame (4) and the steel pipe (1) coaxially includes the following steps: installing the annular base (41) at one end of the steel pipe (1), and using the four measuring fastening devices (42) to detect the distance between the four ports of the cross guide channel (412) of the annular base (41) and the inner wall of the steel pipe (1). When the detected distances are all equal, the annular base (41) and the steel pipe (1) are fixed together.

5. The method for assembling steel pipes with cross-shaped internal supports according to claim 4, characterized in that, The annular base (41) includes a fan-shaped base (411), four fan-shaped bases (411) are arranged at intervals to form the cross guide channel (412), each fan-shaped base (411) has a positioning groove (413) near the edge of the adjacent fan-shaped base (411), the measuring fastening device (42) is located between two adjacent fan-shaped bases (411), the measuring fastening device (42) includes a mounting plate (421) and two positioning blocks provided on the mounting plate (421). 422), the two positioning blocks (422) of the measuring fastening device (42) are respectively inserted into the positioning grooves (413) of the two adjacent sector seats (411), the mounting plate (421) of the measuring fastening device (42) is connected to the two adjacent sector seats (411) through two fasteners (43), and a through hole communicating with the cross guide channel (412) is provided between the two positioning blocks (422) of the mounting plate (421) so that the cross inner support (2) can pass through.

6. The method for assembling steel pipes with cross-shaped internal supports according to claim 5, characterized in that, The measuring and fastening device (42) further includes a lead screw (423) and a locking nut (424). One end of the mounting plate (421) is provided with the positioning block (422). The other end of the mounting plate (421) extends outward along the radial direction of the annular base (41) of the steel pipe (1) and is bent to form a connecting part. The lead screw (423) extends radially along the annular base (41). One end of the lead screw (423) passes through the connecting part and abuts against the outer wall of the steel pipe (1). The locking nut (424) is used to lock the lead screw (423) to the connecting part.

7. The method for assembling steel pipes with cross-shaped internal supports according to claim 6, characterized in that, The measuring fastening device (42) also includes a scale (425) which is disposed on the mounting plate (421) and extends radially along the annular base (41). The scale (425) is used to measure the distance between the annular base (41) and the steel pipe (1).

8. The method for assembling steel pipes with cross-shaped internal supports according to claim 4, characterized in that, The annular base (41) also includes rollers (414). The cross guide channel (412) of the annular base (41) includes intersecting horizontal and vertical channels. Rollers (414) are provided on the lower side wall of the horizontal channel. The rollers (414) are liftable rollers and are arranged in multiples at intervals along the extension direction of the horizontal channel. The rollers (414) are used to contact the corresponding wing plates (21) of the cross inner support (2).

9. The method for assembling steel pipes with cross-shaped internal supports according to claim 1, characterized in that, In S3, before one end of the cross inner support (2) passes through the cross guide channel (412), a cross cone guide head is installed on the cross inner support (2) and the cross cone guide head is used to guide the cross inner support (2) into the cross guide channel (412); in S4, when the annular guide frame (4) is removed, the cross cone guide head is removed.

10. The method for assembling steel pipes with cross-shaped internal supports according to claim 1, characterized in that, In step S4, when welding the cross inner support (2) and the steel pipe (1), they are welded in a symmetrical order.

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