A connection method and device for a square pipe and a round pipe

Abstract

The present invention discloses a connection method and device for a square pipe and a circular pipe. The branch pipe is fixedly connected to the main pipe through a force transmission member. The force transmission member includes a first flange plate, a second flange plate, a web plate, a web stiffener and a bearing circular pipe. The method includes: determining the shapes, sizes and spacing of the two flange plates; determining the shapes and sizes of the web plate and the web stiffener and connecting the web plate and the web stiffener between the two flange plates; vertically connecting the web plate and the web stiffener, and connecting the bearing circular pipe to the web plate with the intersection line of the web plate and the web stiffener as the axis of the bearing circular pipe; and connecting the circular branch pipe to the first flange plate based on the axis of the bearing circular pipe. During construction, the force transmission member is first connected to the main pipe, and then the branch pipe is connected to the force transmission member. This is more convenient for construction workers to operate, can ensure the joint quality after connection, and the device obtained by this connection method has a stable connection, a small size, and is more convenient for transportation.

Description

Technical Field

[0001] The present invention relates to the field of connection node structures of steel pipes, and particularly to a connection method and device for a square pipe and a circular pipe. Background Art

[0002] The design of connection nodes is a key link in the design of steel pipe structures. At present, the connection nodes between different steel pipes often adopt the form of intersecting nodes. An intersecting node refers to a node form in which when different pipe fittings are connected to each other at a certain angle, the branch pipe fitting is processed according to the shape of the intersection line (the intersection line formed on their surfaces when the two pipe fittings intersect) at its end and then directly welded to the surface of the main pipe fitting. In traditional intersecting nodes, the internal force of the branch pipe is all transmitted to the main pipe through the weld, so the requirements for the weld quality are relatively high. To ensure the welding conditions and meet the requirements of mechanical properties, it is usually required to use full penetration welds for connection in structural design.

[0003] At present, the research on intersecting nodes has been relatively mature, and corresponding industry standard specifications have been formed. In the Chinese standard "Standard for Design of Steel Structures", calculation methods for the bearing capacity of intersecting nodes are given, and the applicable scope is also stipulated: the included angle between the axes of the pipes should not be less than 30°. However, in engineering design, it is inevitable to encounter the situation of pipe-pipe connection with a small angle (the included angle is less than 30°).

[0004] However, if the traditional intersecting node form is adopted for small-angle pipe-pipe connection nodes, the following defects will exist: for small-angle intersecting nodes, the space at the intersection of the main pipe and the branch pipe is narrow, making it difficult to meet the welding requirements and resulting in difficult-to-guarantee weld quality; and when the included angle between the pipe axes is very small, the intersection line of the main pipe and the branch pipe is relatively long. To ensure the integrity of the main pipe section within the intersection line range (that is, the segmentation line of the main pipe section does not appear within the intersection line range), the size of the main pipe section needs to be designed larger, thereby increasing the difficulty of transporting and installing the components. Summary of the Invention

[0005] Aiming at the defects existing in the prior art, the technical problem solved by the present invention is: for the connection of small-angle square pipes and circular pipes, how to design the connection method and its device to ensure the relative convenience of the connection construction process, guarantee the connection quality, and reduce the difficulty of transportation and installation.

[0006] To achieve the above technical purpose, the technical solution adopted by the present invention is as follows:

[0007] A connection method for a square pipe and a circular pipe, in which the branch pipe is fixedly connected to the main pipe through a force transmission member. The force transmission member includes a first flange plate, a second flange plate, a web plate, web stiffeners, and a bearing circular pipe;

[0008] The connection method includes step A: connecting the first flange plate and the second flange plate to the main pipe respectively at a specified spacing and substantially perpendicular to the main pipe; connecting the web and the web stiffener between the first flange plate and the second flange plate respectively, and connecting the web stiffener to the web substantially perpendicular; selecting the pressure-bearing circular pipe as two identical semi-circular pipes, taking the intersection line of the web and the web stiffener as the axis position of the pressure-bearing circular pipe, connecting the semi-circular pipes to the web, and ensuring that the end faces of the semi-circular pipes are all connected to the inner side of the first flange plate; taking the axis of the pressure-bearing circular pipe as the reference, connecting the circular branch pipe to the outer side of the first flange plate.

[0009] Preferably, the cross-sectional shape of the branch pipe is defined as circular, the cross-sectional shape of the main pipe can be selected as square, box-shaped or I-shaped, and the axis of the main pipe is not limited to a straight line, and a curve or a broken line can also be selected.

[0010] Preferably, before step A, there is also step B: determining the shapes and sizes of the two flange plates and preparing them; determining the shapes of the web and the web stiffener and preparing them; determining the shape and size of the pressure-bearing circular pipe and preparing it.

[0011] Preferably, the shapes of the two flange plates are both selected as a combined shape of a basic rectangle + a basic semi-circle, the lower bottom edge of the semi-circle is connected to the upper edge of the rectangle, the diameter of the semi-circle and the width of the rectangle are both selected as D + 2△, the value range of △ is 10 - 50 mm, let the rectangular height of the first flange plate be H1, and the rectangular height of the second flange plate be H2, then the value range of the height of H1 is selected as 0.5 - 1.5D, and the value range of the height of H2 is selected as 0 - 0.5D.

[0012] Preferably, the shape of the web is selected as a basic trapezoid, the length of the upper base of the trapezoid is equal to the central axis height of the second flange plate, the length of the lower base of the trapezoid is equal to the central axis height of the first flange plate, and the height is equal to the spacing between the first flange plate and the second flange plate; the shape of the web stiffener is selected as a rectangle, let the inner diameter of the circular branch pipe be d, then the width of the rectangle is d / 2, and the length is equal to the trapezoidal waist length of the web.

[0013] Preferably, the inner and outer diameters of the pressure-bearing circular pipe and the circular branch pipe are equal, and the length is selected as 1.0 - 1.5D.

[0014] Preferably, the method for determining the spacing: Let the spacing between the first flange plate and the second flange plate be L, and the included angle between the axis of the square main pipe and the axis of the circular branch pipe be θ, and the spacing is calculated according to tanθ = (H1 - H2) / L.

[0015] Preferably, the specific connection positions of the web and the web stiffener: Connect the upper and lower bottom edges of the web to the central axes of the first flange plate and the second flange plate respectively, and connect the web stiffeners to the lower bottom edges of the semi-circles of the first flange plate and the second flange plate respectively.

[0016] A device for a square pipe and a circular pipe, comprising a square main pipe, a circular branch pipe and a force transmission member, wherein the square main pipe and the circular branch pipe are connected through the force transmission member;

[0017] The force transmission member includes a first flange plate, a second flange plate, a web plate, web stiffeners and a pressure-bearing circular pipe. The first flange plate and the second flange plate are basically vertically connected to the square main pipe; both the web plate and the web stiffeners are connected between the first flange plate and the second flange plate. The web stiffeners are basically vertically connected to the web plate, and the web stiffeners are separated by the web plate into two identical plate members; the pressure-bearing circular pipe is separated by the web plate into two identical semi-circular pipes. The end face of the semi-circular pipe is connected to the inner side surface of the first flange plate, and the bottom surface of the semi-circular pipe is connected to the web plate;

[0018] The square main pipe includes a first transverse partition plate, a second transverse partition plate and transverse partition stiffeners. The first transverse partition plate and the second transverse partition plate are both arranged on the inner wall of the square main pipe, and the first transverse partition plate is coplanar with the first flange plate, and the second transverse partition plate is coplanar with the second flange plate; the transverse partition stiffeners are coplanar with the web plate and are connected between the first transverse partition plate and the second transverse partition plate.

[0019] Preferably, welds are selected for welding between the square main pipe and the force transmission member, between the circular branch pipe and the force transmission member, and between the components of the force transmission member. The welds can be one or more of fillet welds or full penetration welds.

[0020] Compared with the prior art, the beneficial effects of the novel connection method and device for a square pipe and a circular pipe proposed by the present invention are as follows:

[0021] 1. In this connection method, the branch pipe is fixedly connected to the main pipe by using a force transmission member. Since the main pipe and the branch pipe do not directly contact during the connection construction, it is only necessary to first connect the force transmission member to the main pipe and then connect the branch pipe to the force transmission member. Compared with the method of using a multi-planar joint for small-angle pipe-to-pipe connection, which has the problem of difficult welding due to the narrow welding space, this method is more convenient for operators and can ensure the joint quality after connection.

[0022] 2. For the force transmission member used in this connection method, since the connections of its various components mostly adopt connection relationships such as basically vertical and basically parallel, the integrity of the force transmission member composed of various components is relatively strong. Compared with the small-angle pipe-to-pipe multi-planar joint, in order to ensure the integrity of the main pipe section within the multi-planar line range, the size of the main pipe section is designed to be relatively large. The device of this connection method is firmly connected, has a small size, and is more convenient for transportation and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic diagram of the overall structure of a device for a square pipe and a circular pipe provided by an embodiment of the present invention;

[0025] Figure 2 Side view of a device for a square pipe and a circular pipe provided by an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the cross-section of the first flange plate (A - A) and the cross-section of the second flange plate (B - B) of a device for a square pipe and a circular pipe provided by an embodiment of the present invention;

[0027] Figure 4 Schematic diagram of the cross-section of the web (C - C) of a device for a square pipe and a circular pipe provided by an embodiment of the present invention.

[0028] In the figure: 1 - square main pipe; 11 - first transverse diaphragm; 12 - transverse diaphragm stiffener; 13 - second transverse diaphragm; 2 - circular branch pipe; 3 - force - transmitting member; 31 - first flange plate; 32 - pressure - bearing circular pipe; 33 - web; 34 - web stiffener; 35 - second flange plate. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0030] As Figure 1 、 2 shown, an embodiment of the present invention provides a connection method for a square pipe and a circular pipe. It fixedly connects the branch pipe to the main pipe through the force - transmitting member 3 (this method is mainly applicable to the connection where the included angle between the axes of the main pipe and the branch pipe is less than 30°, and it can also be used when the included angle is greater than 30°). The force - transmitting member 3 includes a first flange plate 31, a second flange plate 35, a web 33, a web stiffener 34, and a pressure - bearing circular pipe 32. On this basis, this connection method includes step A:

[0031] Determine the spacing between the first flange plate 31 and the second flange plate 35, and connect the first flange plate 31 and the second flange plate 35 to the main pipe respectively and substantially perpendicular to the main pipe according to the determined spacing;

[0032] Connect both the web plate 33 and the web stiffener 34 between the first flange plate 31 and the second flange plate 35, and the web stiffener 34 is connected to the web plate 33 substantially perpendicular;

[0033] The pressure-bearing circular pipe 32 is selected as two identical semi-circular pipes. Taking the intersection line of the web plate 33 and the web stiffener 34 as the axis position of the pressure-bearing circular pipe 32, connect the two semi-circular pipes opposite to each other on the web plate 33, and ensure that the end face of the semi-circular pipe is connected to the inner side face of the first flange plate 31;

[0034] Taking the axis of the pressure-bearing circular pipe 32 as the axis position of the circular branch pipe 2, connect the circular branch pipe 2 to the outer side face of the first flange plate 31.

[0035] The effects brought by the above connection method are as follows:

[0036] 1. This connection method fixes and connects the branch pipe to the main pipe by using the force-transferring member 3. Since the main pipe and the branch pipe do not directly contact during the connection construction, it is only necessary to first connect the force-transferring member 3 to the main pipe and then connect the branch pipe to the force-transferring member 3. Compared with the method of using a multi-planar joint for small-angle pipe-to-pipe connection, which has the problem of difficult welding due to the narrow welding space, this method is more convenient for operation by construction personnel and can ensure the joint quality after connection.

[0037] 2. For the force-transferring member 3 used in this connection method, since the connections of its various components mostly adopt connection relationships such as substantially perpendicular and substantially parallel, the integrity of the force-transferring member 3 composed of various components is relatively strong. Compared with a small-angle pipe-to-pipe multi-planar joint, which designs the size of the main pipe segment larger to ensure the integrity of the main pipe segment within the multi-planar line range, the device of this connection method is firmly connected, has a smaller size, and is more convenient for transportation and installation.

[0038] Furthermore, for the steel pipes connected by using this connection method, the cross-sectional shape of the branch pipe is limited to a circle, while the cross-sectional shape of the main pipe is not limited to a square, and box-shaped or I-shaped can also be selected. Moreover, the axis of the main pipe is not limited to a straight line. On the basis of ensuring that the main pipe of the connection segment can be firmly connected to the branch pipe through the force-transferring member 3, an axis that is a curve or a broken line is also applicable to this connection method.

[0039] Furthermore, before the step A, there is also a step B: determine the shapes and sizes of the two flange plates and prepare them; determine the shapes of the web plate 33 and the web stiffener 34 and prepare them; determine the shape and size of the pressure-bearing circular pipe 32 and prepare it.

[0040] Furthermore, as Figure 3As shown, in this embodiment, the shapes of the two flange plates are selected as a combined shape of a basic rectangle + a basic semi - circle. The lower base of the semi - circle is connected to the upper side of the rectangle. Let the outer diameter of the circular branch pipe 2 be D, then both the diameter of the semi - circle and the width of the basic rectangle are D + 2△, where the value range of △ is 10 - 50 mm. Let the rectangular height of the first flange plate 31 be H1 and the rectangular height of the second flange plate 35 be H2. Then the value range of the height of H1 is 0.5 - 1.5D, and the value range of the height of H2 is 0 - 0.5D. Selecting flange plates in the force - transmitting member 3 can improve the ultimate strength of the force - transmitting member 3 against bending moment and torque.

[0041] Further, as Figure 1 、 2 、shown in Figure 4, in this embodiment, the shape of the web 33 is selected as a basic trapezoid. The upper base length of the trapezoid is H2 + D + △ (the central axis height of the second flange plate 35), the lower base length of the trapezoid is H1 + D + △ (the central axis height of the first flange plate 31), and the height is L (the distance between the first flange plate 31 and the second flange plate 35); for the shape of the web stiffener 34, a basic rectangle can be selected. Let the inner diameter of the circular branch pipe 2 be d, then the width of the rectangle is d / 2, and the length is equal to the waist length of the trapezoid of the web 33.

[0042] Further, in this embodiment, the inner and outer diameters of the pressure - bearing circular pipe 32 are equal to the inner and outer diameters of the circular branch pipe 2, and the length is selected as 1.0 - 1.5D. Through the setting of the pressure - bearing circular pipe 32, it can bear the pressure transmitted from the circular branch pipe 2 to the first flange plate 31, thereby improving the bearing capacity and overall stiffness of the patented member 3.

[0043] Further, the method for determining the distance between the first flange plate 31 and the second flange plate 35: Let the distance between the first flange plate 31 and the second flange plate 35 be L, and the known angle between the axes of the square main pipe 1 and the circular branch pipe 2 is θ (θ < 30°). Then, according to tanθ=(H1 - H2) / L, the distance between the first flange plate 31 and the second flange plate 35 is calculated.

[0044] Further, as Figure 1 、 3 shown, the specific connection positions of the web 33 and the web stiffener 34 are: Connect the upper and lower bottom edges of the web 33 to the central axes of the first flange plate 31 and the second flange plate 35 respectively, and connect the two wide edges of the web stiffener 34 to the lower bottom edges of the semi - circles of the first flange plate 31 and the second flange plate 35 respectively. By arranging the web 33 between the flange plates, the shear - bearing capacity of the force - transmitting member 3 can be improved, and the web stiffener 34 is used to prevent the web 33 from buckling caused by shear stress and local compressive stress, further improving the shear - bearing capacity and overall stiffness of the web 33.

[0045] As Figure 1 , 2 shown, a device of a square pipe and a circular pipe obtained by the connection method provided by the embodiment of the present invention includes a square main pipe 1, a circular branch pipe 2, and a force transfer member 3. The square main pipe 1 and the circular branch pipe 2 are fixedly connected through the force transfer member 3, and the included angle between the axes of the square main pipe 1 and the circular branch pipe 2 is less than 30°.

[0046] The force transfer member 3 includes a first flange plate 31, a second flange plate 35, a web plate 33, a web stiffener 34, and a pressure-bearing circular pipe 32. The first flange plate 31 and the second flange plate 35 are substantially vertically connected to the square main pipe 1, and the first flange plate 31 and the second flange plate 35 are substantially parallel; the web plate 33 and the web stiffener 34 are both connected between the first flange plate 31 and the second flange plate 35. The web stiffener 34 is substantially vertically connected to the web plate 33, and the web stiffener 34 is separated into two identical plate members by the web plate 33; the pressure-bearing circular pipe 32 is separated into two identical semi-circular pipes by the web plate 33. The end face of the semi-circular pipe is connected to the inner surface of the first flange plate 31, and the side surface of the semi-circular pipe is connected to the web plate 33.

[0047] The square main pipe 1 includes a first transverse partition plate 11, a second transverse partition plate 13, and a transverse partition stiffener 12. The first transverse partition plate 11 and the second transverse partition plate 13 are both arranged on the inner wall of the square main pipe 1, and the first transverse partition plate 11 is coplanar with the first flange plate 31, and the second transverse partition plate 13 is coplanar with the second flange plate 35; the transverse partition stiffener 12 is coplanar with the web plate 33 and is connected between the first transverse partition plate 11 and the second transverse partition plate 13. The arrangement of the transverse partition stiffener 12 can improve the bearing capacity and overall stiffness of the patent member 3.

[0048] Furthermore, welds are selected for welding between the square main pipe 1 and the force transfer member 3, between the circular branch pipe 2 and the force transfer member 3, and between the components of the force transfer member 3. Specifically, the welds for welding can be selected from one or more of fillet welds or full penetration welds to ensure that the components can be firmly connected to form a stable connection joint structure.

[0049] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0050] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0051] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A connection method for a square pipe and a circular pipe, which fixedly connects a branch pipe to a main pipe through a force transmission member (3), characterized in that: The force - transferring member (3) includes a first flange plate (31), a second flange plate (35), a web (33), web stiffeners (34) and a pressure - bearing circular pipe (32). The connecting method includes step A: Connect the first flange plate (31) and the second flange plate (35) to the main pipe respectively and substantially perpendicularly at a specified spacing; Connect the web (33) and the web stiffeners (34) between the first flange plate (31) and the second flange plate (35) respectively, and the web stiffeners (34) are connected to the web (33) substantially perpendicularly; The pressure - bearing circular pipe (32) is selected as two identical semi - circular pipes. Taking the intersection line of the web (33) and the web stiffeners (34) as the axis position of the pressure - bearing circular pipe (32), connect the semi - circular pipes to the web (33), and ensure that the end faces of the semi - circular pipes are all connected to the inner side surface of the first flange plate (31); Taking the axis of the pressure - bearing circular pipe (32) as the reference, connect the circular branch pipe (2) to the outer side surface of the first flange plate (31).

2. The connection method of a square pipe and a circular pipe according to claim 1, characterized in that: The cross - sectional shape of the branch pipe is defined as circular. The cross - sectional shape of the main pipe can be selected as square, box - shaped or I - shaped. The axis of the main pipe is not limited to a straight line, and a curve or a broken line can also be selected.

3. A connection method for a square pipe and a circular pipe according to claim 1, characterized in that: Before the step A, there is also step B: Determine the shapes and sizes of the two flange plates and prepare them; Determine the shapes of the web (33) and the web stiffeners (34) and prepare them; Determine the shape and size of the pressure - bearing circular pipe (32) and prepare it.

4. The connection method of a square pipe and a circular pipe according to claim 3, characterized in that: The shapes of the two flange plates are both selected as a combined shape of a basic rectangle + a basic semi - circle. The lower bottom edge of the semi - circle is connected to the upper edge of the rectangle. Both the diameter of the semi - circle and the width of the rectangle are selected as D + 2△, where the value range of △ is 10 - 50 mm. Let the rectangular height of the first flange plate (31) be H1 and the rectangular height of the second flange plate (35) be H2. Then the value range of the height of H1 is selected as 0.5 - 1.5D, and the value range of the height of H2 is selected as 0 - 0.5D.

5. The connection method of a square pipe and a circular pipe according to claim 3, characterized in that: The shape of the web (33) is selected as a basic trapezoid. The length of the upper base of the trapezoid is equal to the central axis height of the second flange plate (35), the length of the lower base of the trapezoid is equal to the central axis height of the first flange plate (31), and the height is equal to the spacing between the first flange plate (31) and the second flange plate (35); The shape of the web stiffeners (34) is selected as a rectangle. Let the inner diameter of the circular branch pipe (2) be d, then the width of the rectangle is d / 2, and the length is equal to the trapezoidal waist length of the web (33).

6. The connection method of a square pipe and a round pipe according to claim 3, characterized in that: The inner and outer diameters of the pressure - bearing circular pipe (32) and the circular branch pipe (2) are equal, and the length is selected as 1.0 - 1.5D.

7. A connecting method for a square pipe and a circular pipe as claimed in claim 1, characterized in that: The method for determining the spacing: Let the spacing between the first flange plate (31) and the second flange plate (35) be L, and the included angle between the axis of the square main pipe (1) and the axis of the circular branch pipe (2) be θ. According to tanθ=(H1 - H2) / L, calculate to obtain the spacing.

8. A connection method for a square pipe and a circular pipe according to claim 1, characterized in that: Specific connection positions of the web (33) and the web stiffener (34): Connect the upper and lower bottom edges of the web (33) to the central axes of the first flange plate (31) and the second flange plate (35) respectively, and connect the web stiffener (34) to the lower bottom edges of the semi-circular shapes of the first flange plate (31) and the second flange plate (35) respectively.

9. A device for square tubes and round tubes, characterized in that: It includes a square main pipe (1), a circular branch pipe (2) and a force transfer member (3), and the square main pipe (1) and the circular branch pipe (2) are connected through the force transfer member (3); The force transfer member (3) includes a first flange plate (31), a second flange plate (35), a web (33), a web stiffener (34) and a pressure-bearing circular pipe (32). The first flange plate (31) and the second flange plate (35) are basically vertically connected to the square main pipe (1); both the web (33) and the web stiffener (34) are connected between the first flange plate (31) and the second flange plate (35). The web stiffener (34) is basically vertically connected to the web (33), and the web stiffener (34) is separated by the web (33) into two identical plate members; the pressure-bearing circular pipe (32) is separated by the web (33) into two identical semi-circular pipes. The end faces of the semi-circular pipes are connected to the inner side surfaces of the first flange plate (31), and the bottom surfaces of the semi-circular pipes are connected to the web (33); The square main pipe (1) includes a first diaphragm (11), a second diaphragm (13) and a diaphragm stiffener (12). The first diaphragm (11) and the second diaphragm (13) are both arranged on the inner wall of the square main pipe (1), and the first diaphragm (11) is coplanar with the first flange plate (31), and the second diaphragm (13) is coplanar with the second flange plate (35); the diaphragm stiffener (12) is coplanar with the web (33) and is connected between the first diaphragm (11) and the second diaphragm (13).

10. A device for a square pipe and a round pipe according to claim 9, characterized in that: Weld seams are selected for welding between the square main pipe (1) and the force transfer member (3), between the circular branch pipe (2) and the force transfer member (3), and between the various components of the force transfer member (3). The weld seams can be selected from one or more of fillet welds or full penetration welds.

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