Anti-corrosion reinforcing method for coal transporting trestle with deformed web members
By installing temporary struts on the coal conveying trench and using correction tools to correct the deformed abdominal rods, the problem of structural bearing capacity reduction caused by deformation of the coal conveying trench’s abdominal rods is solved, and the structural stability and safety after reinforcement are improved.
Patent Information
- Application Number
- CN202510507961.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2025-06-06
AI Technical Summary
The deformation of the abdominal rod of the coal transport trench leads to a decrease in the structural bearing capacity and a second-order effect, which may cause serious consequences of continuous collapse. It is difficult for the existing technology to strengthen the deformed abdominal rod safely and conveniently.
A temporary strut is installed on the coal conveying trench, and the upper node plate is supported by friction, and the upper node plate is pushed to move with the correction tool to correct the deformed abdominal rod. Then, the temporary strut rod is fixedly connected to the upper node plate to form the repaired trench abdominal rod.
The temporary strut quickly participates in the structural stress, prevents the deformation from expanding continuously, and realizes the correction and reinforcement of the deformed abdominal rod, improving the safety of the reinforcement process and structural stability.
Smart Images
Figure CN120099873A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of steel structure reinforcement, and in particular to an anti-corrosion reinforcement method for a coal handling trestle with a deformed web. Background Art
[0002] The coal conveyor trestle is the core structure of the coal conveying system, usually a steel truss structure. It is responsible for carrying the belt to transport coal from underground through washing and loading, ensuring a stable supply of coal.
[0003] However, due to the influence of external environment, improper use and long-term service, the internal rods of coal handling trestle are often deformed. The web members of coal handling trestle usually bend and deform. The deformation of web members will not only reduce their own bearing capacity, but also superimpose the second-order effect caused by the deformation, leading to the overall deformation of the structure and the redistribution of internal forces. If the deformation is too large, it will cause the coal handling trestle to collapse continuously. Summary of the invention
[0004] A technical problem to be solved by the present disclosure is: for a coal conveying trestle with deformed web members, how to safely and conveniently reinforce the deformed web members.
[0005] In order to solve the above technical problems, the embodiment of the present disclosure provides an anti-corrosion reinforcement method for a coal conveyor trestle with a deformed web. In the coal conveyor trestle, the two ends of the deformed web are respectively connected to an upper node plate and a lower node plate. The deformation repair method includes: S1. Installing a temporary strut on the coal conveyor trestle, wherein the first end of the temporary strut is fixed to the lower node plate, and the second end of the temporary strut is attached to the upper node plate to support the upper node plate along its extension direction through friction; S2. Using a correction tool to push the upper node plate to move back to the target position to correct the deformed web; S3. Fixing the second end of the temporary strut to the upper node plate, the temporary strut and the corrected deformed web together form the repaired trestle web.
[0006] In some embodiments, in S1, before installing the temporary strut, a bolt hole is opened on the upper node plate, and the upper part of the temporary strut is provided with an oblong hole extending along its own length direction, and the second end of the temporary strut is connected to the upper node plate by a bolt passing through the oblong hole and the bolt hole.
[0007] In some embodiments, in S3, after the second end of the temporary strut is fixed to the upper node plate, a connecting plate is provided between the temporary strut and the corrected deformed web member to form a trestle web member.
[0008] In some embodiments, a plurality of connecting plates evenly distributed along the length direction of the trestle web are provided on the trestle web.
[0009] In some embodiments, in S3, after the temporary struts and the deformed web members are connected by connecting plates to form the trestle web members, weather-resistant glue is applied on the surface of the trestle web members.
[0010] In some embodiments, in S2, a jack is used to correct the deformed web.
[0011] In some embodiments, in S2, the deformed web is flame heated to assist the jack in performing a corrective process.
[0012] In some embodiments, the temporary brace includes two angle steels symmetrically arranged along the upper gusset plate.
[0013] In some embodiments, in S3, fireproofing mortar is filled between the two angle steels and the deformed web member.
[0014] In some embodiments, in S3, the second end of the temporary brace is fixed to the upper node plate by welding.
[0015] Through the above technical scheme, the present invention provides an anti-corrosion reinforcement method for a coal conveyor trestle with a deformed web, in which temporary struts are installed on the coal conveyor trestle to quickly participate in the force of the coal conveyor trestle structure, thereby preventing continuous expansion of deformation and causing continuous collapse, and then utilizing the relative sliding between the upper end and the upper node plate after overcoming friction to adapt to the correction process of the deformed web. After the correction is completed, the temporary struts are fixedly connected to the upper node plate, and combined with the corrected deformed web to form a reinforced trestle web, thereby effectively improving the safety of the reinforcement process and the stability of the trestle structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 is a schematic diagram of a coal transport trestle disclosed in an embodiment of the present disclosure;
[0018] Figure 2 It is a schematic diagram showing the partial structure of the upper node plate disclosed in the embodiment of the present disclosure;
[0019] Figure 3 is a partial structural schematic diagram showing a lower node plate disclosed in an embodiment of the present disclosure;
[0020] Figure 4 is a cross-sectional schematic diagram showing the connection between the temporary brace and the upper node plate disclosed in the embodiment of the present disclosure;
[0021] Figure 5 It is a cross-sectional schematic diagram showing the reinforced trestle web member disclosed in the embodiment of the present disclosure.
[0022] Description of reference numerals:
[0023] 1. Deformed web member; 2. Upper node plate; 201. Bolt hole; 3. Lower node plate; 4. Temporary support rod; 401. Oblong hole; 5. Bolt; 6. Connecting plate; 7. Upper chord; 8. Lower chord; 9. Normal web member. DETAILED DESCRIPTION
[0024] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
[0025] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.
[0026] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0027] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.
[0028] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.
[0029] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.
[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.
[0031] like Figure 1-Figure 5 As shown, the present disclosure provides an anti-corrosion reinforcement method for a coal conveying trestle with a deformed web. In the coal conveying trestle, the two ends of the deformed web 1 are respectively connected to an upper node plate 2 and a lower node plate 3, and the deformation repair method includes: S1, installing a temporary strut 4 on the coal conveying trestle, the first end of the temporary strut 4 is fixed to the lower node plate 3, and the second end of the temporary strut 4 is fitted to the upper node plate 2 to support the upper node plate 2 along its extension direction by friction; S2, using a correction tool to push the upper node plate 2 to move back to the target position to correct the deformed web 1; S3, fixing the second end of the temporary strut 4 to the upper node plate 2, and the temporary strut 4 and the corrected deformed web 1 together form a repaired trestle web.
[0032] Specifically, normal webs in the coal conveyor trestle are prone to bending and deformation under the influence of the vibration of the coal conveyor belt and the alternating dry and wet corrosive environment. When a deformed web 1 appears, the coal conveyor trestle needs to rely on the residual supporting force retained by the deformed web 1 between the upper node plate 2 and the lower node plate 3 to maintain stability at the deformed position. At this time, if correction tools are rashly used to correct and repair the deformed web 1, it is easy to cause adverse disturbances to the force system of the coal conveyor trestle, resulting in further expansion of the deformation and even continuous collapse of the trestle, which poses a high construction risk.
[0033] Therefore, in S1 of the present application, a temporary support rod 4 is provided between the upper node plate 2 and the lower node plate 3, the first end of which is fixedly connected to the lower node plate 3, and the second end is fitted to the upper node plate 2. When relative movement or a tendency of relative movement occurs between the second end of the deformed web member 1 and the upper node plate 2, a friction force that hinders the relative movement or the tendency of relative movement will be generated on the contact surface between the two. When the deformed web member 1 is not corrected, the friction force and the residual supporting force of the deformed web member 1 work together to prevent the coal conveying trestle from further deformation, thereby effectively improving the stability of the coal conveying trestle with the deformed web member 1. A friction plate can be provided on the contact surface between the second end of the temporary support rod 4 and the upper node plate 2, and the two can be kept in close contact by an external clamp or fixture, so that there is a certain positive pressure and dynamic friction factor between the two, ensuring that sufficient friction is provided to maintain the stability of the coal conveying trestle.
[0034] In S2, in the process of pushing the upper node plate 2 back to the initial position before the web member is deformed, the correction tool first needs to overcome the friction between the temporary strut 4 and the upper node plate 2 to push the upper node plate 2 to move. The relative sliding setting between the temporary strut 4 and the upper node plate 2 also enables it to adapt to the correction process of the deformed web member 1. Among them, when the correction tool overcomes the friction between the temporary strut 4 and the upper node plate 2 so that the two can slide relative to each other, the correction tool has provided the coal conveying trestle with a force greater than or equal to the above-mentioned friction force, and the force system of the structure has achieved a stable transition, avoiding the situation where the correction tool directly acts on the coal conveying trestle and causes disturbance to the force system. Then, by further increasing the force of the correction tool on the coal conveying trestle, the upper node plate 2 is pushed to move to the initial position before the web member is deformed, so that the compressed deformed web member 1 is restored to a straight state and the correction is completed. The correction tool here can use a jack that directly acts on the upper and lower node plates or a support frame with a top screw between the upper and lower node plates, and cooperate with a rigid clamp to limit the deformation position of the deformed web 1 to prevent further expansion of the deformation, and rotate the top screw on the support frame to gradually adjust the position of the upper node plate 2.
[0035] In S3, since the deformed web member 1 has undergone a process of deformation and correction, cracks will inevitably appear inside its structure. After the correction is completed, the second end of the temporary support rod 4 is fixedly connected to the upper node plate 2, and together with the corrected deformed web member 1, a trestle web member is formed, which effectively improves the stability of the coal conveying trestle.
[0036] like Figure 2 and Figure 3As shown, in some embodiments, in order to improve the stability of the coal conveyor trestle after correction, when installing the temporary struts 4 in S1, the temporary struts 4 are installed in a position parallel to and close to the web members before deformation. After the correction is completed, the temporary struts 4 are close to the deformed web members 1 after correction and the two are parallel to each other, which is beneficial to provide stable support for the coal conveyor trestle.
[0037] like Figure 2 and Figure 4 As shown, in some embodiments, in S1, before installing the temporary strut 4, a bolt hole 201 is opened on the upper node plate 2, and the upper part of the temporary strut 4 is provided with an oblong hole 401 extending along its own length direction, and the second end of the temporary strut 4 is connected to the upper node plate 2 by a bolt 5 passing through the oblong hole 401 and the bolt hole 201.
[0038] Specifically, the bolt 5 arranged in the oblong hole 401 and the bolt hole 201 cooperates with the nut to press the second end of the temporary strut 4 against the surface of the upper node plate 2, so that a certain positive pressure is maintained between the two to have a friction force that can prevent the deformation from further expanding. After the correction tool overcomes the friction force, the bolt 5 can move along the extension direction of the oblong hole 401 under the push of the correction tool, so that relative movement can be generated between the temporary strut 4 and the upper node plate 2 to adapt to the correction process of the deformed web member 1.
[0039] In some embodiments, in S1, when installing the temporary support rod 4, the bolt hole 201 is located at the lowest end of the oblong hole 401. This arrangement allows the upper node plate 2 to only move upward relative to the temporary support rod 4 after the bolt 5 is installed, preventing the upper node plate 2 from moving downward relative to the temporary support rod 4, effectively preventing further deformation of the coal handling trestle.
[0040] Normally, since the rods in the coal conveying trestle are only used to bear pressure or tension along the rod body direction, when the web of the coal conveying trestle is compressed and deformed, under the action of pressure, the upper node plate 2 and the lower node plate 3 located at both ends of the deformed web 1 will move toward each other along the length direction of the web. By providing an oblong hole 401 along the length direction of the temporary support rod 4, the movement of the upper node plate 2 in the subsequent correction process can be coordinated. In other embodiments, when it is necessary to push the upper node plate 2 to move back to the target position in other directions (such as obliquely upward), the direction of the oblong hole 401 on the temporary support rod 4 can also be appropriately adjusted to adapt to the correction process.
[0041] like Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments, in S3, after the second end of the temporary strut 4 is fixed to the upper node plate 2, a connecting plate 6 is arranged between the temporary strut 4 and the corrected deformed web member 1 to form a trestle web member.
[0042] Specifically, in S3, the upper node plate 2 has been pushed to the initial position, the deformed web member 1 is restored to be straight, the second end of the temporary support rod 4 is fixedly connected to the upper node plate 2 to form a stable support, and then the two parallel rods are connected by the connecting plate 6 to form a common force-bearing body, that is, the repaired trestle web member, which effectively improves the stability of the repaired coal handling trestle. For the convenience of construction, the connecting plate 6 here can be a short steel plate that is vertical and welded and fixed to the two rods.
[0043] In some embodiments, a plurality of connecting plates 6 evenly distributed along the length direction of the trestle web are provided on the trestle web.
[0044] Specifically, the trestle web member includes a fixed temporary strut 4, a corrected deformed web member 1 and a connecting plate 6 connecting the former two. The connecting plate 6 is evenly distributed along the length direction of the trestle web member, which can effectively reduce the slenderness ratio of the above two rods and improve the compressive stability of the rods.
[0045] In some embodiments, in S3, after the temporary struts 4 and the deformed web members 1 are connected by the connecting plates 6 to form the trestle web members, weather-resistant glue is applied on the surface of the trestle web members.
[0046] Specifically, applying weather-resistant glue on the surface of the pier web can effectively improve the corrosion resistance and water resistance of the structure. After the glue solidifies, it has a certain flexibility, which can partially absorb the vibration or deformation stress of the steel and prevent the rigid fracture of the structure. When applying weather-resistant glue, the surface of the rod should be derusted and degreased to ensure that there are no impurities on the surface, and the coating should be done when the surface of the rod is dry.
[0047] In some embodiments, in S2 , a jack is used to correct the deformed web member 1 .
[0048] Specifically, when using a jack to correct the deformed web 1, the two ends of the jack are respectively placed against the upper node plate 2 and the lower node plate 3, and a reaction frame or a rigid fulcrum is set to rigidly fix the lower node plate 3. The jack is pressurized step by step for multiple times, and the pressure is maintained for 5-10 minutes after each pressurization. The deformation recovery of the coal conveyor trestle is observed. After pushing the upper node plate 2 to the target position, the jack maintains the pressure for more than 30 minutes to release the residual stress inside the deformed web 1, and then the jack is slowly unloaded to observe the structural rebound to ensure that the rebound is within the allowable range.
[0049] In some embodiments, a steel pad is provided at the contact point between the jack and the upper node plate 2 to disperse the stress at the contact point and avoid local collapse. At the same time, strain gauges can be installed on the adjacent upper chord 7, lower chord 8 and normal web 9 for strain monitoring to prevent secondary damage.
[0050] In some embodiments, in S2, the deformed web member 1 is flame heated to assist the jack in performing the correction process.
[0051] Specifically, before using the correction tool to push the upper node plate 2 to correct the deformed web 1, an oxygen-acetylene flame gun can be used to auxiliary heat the deformed position of the web to cause controllable plastic deformation of the rod, so that it can be restored to a straight state under the action of the correction tool.
[0052] like Figure 5 As shown, in some embodiments, the temporary bracing bar 4 includes two angle steels symmetrically arranged along the upper node plate 2 .
[0053] Specifically, in S1, a single angle steel is placed on one side of the upper node plate 2 and the lower node plate 3, and the angle steel is fixedly connected to the lower node plate 3. Welding or bolt-screw hole fixing can be adopted, and then the bolt hole 201, the oblong hole 401 and the bolt 5 are combined to complete the connection between the angle steel and the upper node plate 2. The two symmetrically arranged angle steels can be installed successively or simultaneously, which improves the construction convenience. In S3, the two symmetrically arranged angle steels along the upper node plate 2 can provide stable supporting force for the coal conveying trestle, which is beneficial to the stable force of the repaired coal conveying trestle.
[0054] In some embodiments, in S3 , fireproofing mortar is filled between the two angle steels and the deformed web member 1 .
[0055] Specifically, in S3, after the fixed temporary struts 4 and the corrected deformed web members 1 are connected as a common force-bearing body using the connecting plate 6, fire-resistant putty is filled in the gap between the angle steel and the deformed web member 1, and then the surface of the structure is coated with weather-resistant glue. By filling the structural gap with fire-resistant putty, the fire resistance limit of the coal conveyor trestle can be effectively improved, while also having the sealing and anti-corrosion functions.
[0056] In some embodiments, in S3 , the second end of the temporary strut 4 and the upper node plate 2 are fixed by welding.
[0057] Specifically, after the upper node plate 2 is pushed to the target position by the correction tool, the correction tool is maintained to support the structure, and the second end of the temporary support rod 4 is welded and fixed to the upper node plate 2 to form a stable support. In other embodiments, the bolt 5 can also be fixed by filling the oblong hole 401, and the welding connection is combined to improve the fixing effect between the second end of the temporary support rod 4 and the upper node plate 2.
[0058] The following is an explanation of the anti-corrosion reinforcement method of a coal handling trestle with a deformed web according to an embodiment of the present invention:
[0059] First, for the coal handling trestle with deformed web members 1, the coal handling operation is stopped and the upper load is cleared, the surfaces of the upper node plate 2 and the lower node plate 3 are cleaned, and bolt holes 201 are opened on the upper node plate 2. Two angle steels with oblong holes 401 on the top are placed on both sides of the upper node plate 2 and the lower node plate 3 respectively. The lower ends of the two angle steels are fixed to the lower node plate 3 by welding, and the upper ends are connected to the upper node plate 2 by bolts 5 to form temporary struts 4;
[0060] Secondly, a reaction frame is set to rigidly fix the lower node plate 3, and the two ends of the jack are respectively placed against the upper node plate 2 and the lower node plate 3, and pressure is applied step by step. The pressure of the jack first overcomes the friction between the temporary support rod 4 and the upper node plate 2, and then the pressure is continued and the deformed position of the web is heated by flame using an oxygen-acetylene flame gun. The upper node plate 2 is pushed to the target position using a correction tool, so that the deformed web 1 is restored to be straight;
[0061] Finally, the second end of the temporary strut 4 is welded and fixed to the upper node plate 2, and a connecting plate 6 is set to connect the fixed temporary strut 4 and the corrected deformed web member 1, fireproof putty is filled in the gap between the rods, and weather-resistant glue is applied on the surface of the rods to form the repaired trestle web member.
[0062] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.
[0063] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.
Claims
1. A method for anti-corrosion reinforcement of a coal handling trestle with a deformed web member, wherein two ends of the deformed web member (1) are respectively connected to an upper node plate (2) and a lower node plate (3), characterized in that: The anti-corrosion reinforcement method comprises: S1. Install a temporary support rod (4) on the coal conveying trestle, wherein the first end of the temporary support rod (4) is fixed to the lower node plate (3), and the second end of the temporary support rod (4) is attached to the upper node plate (2) to support the upper node plate (2) along its extension direction by friction; S2, using a correction tool to push the upper node plate (2) to move back to the target position to correct the deformed web member (1); S3, the second end of the temporary strut (4) is fixedly connected to the upper node plate (2), and the temporary strut (4) and the corrected deformed web member (1) together form a reinforced trestle web member.
2. The anti-corrosion reinforcement method of the coal handling trestle with deformed web members according to claim 1 is characterized in that: In S1, before installing the temporary strut (4), a bolt hole (201) is opened on the upper node plate (2), and the upper part of the temporary strut (4) is provided with an oblong hole (401) extending along its length direction, and the second end of the temporary strut (4) is connected to the upper node plate (2) by a bolt (5) passing through the oblong hole (401) and the bolt hole (201).
3. The anti-corrosion reinforcement method of the coal handling trestle with deformed web members according to claim 1, characterized in that: In S3, after the second end of the temporary support rod (4) is fixed to the upper node plate (2), a connecting plate (6) is arranged between the temporary support rod (4) and the corrected deformed web member (1) to form the trestle web member.
4. The anti-corrosion reinforcement method of the coal handling trestle with deformed web members according to claim 3 is characterized in that: The trestle web is provided with a plurality of connecting plates (6) evenly distributed along its length direction.
5. The anti-corrosion reinforcement method of the coal handling trestle with deformed web members according to claim 3, characterized in that: In S3, after the temporary support rod (4) and the deformed web member (1) are connected by a connecting plate (6) to form the trestle web member, weather-resistant glue is applied on the surface of the trestle web member.
6. The anti-corrosion reinforcement method of the coal handling trestle with deformed web members according to claim 1, characterized in that: In S2, a jack is used to correct the deformed web member (1).
7. The anti-corrosion reinforcement method of the coal handling trestle with deformed web members according to claim 6, characterized in that: In S2, the deformed web (1) is flame heated to assist the jack in performing a correction process.
8. The anti-corrosion reinforcement method of the coal handling trestle with deformed web members according to claim 1, characterized in that: The temporary support rod (4) comprises two angle steels symmetrically arranged along the upper node plate (2).
9. The anti-corrosion reinforcement method of the coal handling trestle with deformed web members according to claim 8, characterized in that: In S3, fireproofing mortar is filled between the two angle steels and the deformed web member (1).
10. The anti-corrosion reinforcement method of the coal handling trestle with deformed web members according to claim 1, characterized in that: In S3, the second end of the temporary support rod (4) and the upper node plate (2) are fixed by welding.