Design method and application method of vertical transition section in heightened tower

Abstract

According to the design and application method of the upright transition section in the heightened tower, the transition section is of a rectangular upright net-shaped column structure, the upper portion and the lower portion of the transition section are each provided with a connecting structure used for being connected with a tower body, and each connecting structure comprises a connector connecting plate and a connector main material connecting angle steel; comprising the following steps; the method comprises the steps that S1, after it is confirmed that assembly construction of the lower portion of the iron tower is completed, gusset plates and inclined materials, used for connecting transition sections, at the top end of the lower portion and the bottom end of the upper portion of the iron tower are adjusted to adapt to transition section connecting structures; s2, the transition section is inserted into the tower body of the original structure on the lower portion of the iron tower through a crane or a holding pole, and the transition section is in lap joint with the top end of the tower body of the original structure on the lower portion of the iron tower through a connecting structure on the lower portion of the transition section; s3, after the stability of the connecting structure of the transition section and the lower portion of the iron tower is confirmed, an upper tower body of the iron tower is connected with the connecting structure of the upper portion of the transition section, and overall heightening of the iron tower is achieved; the method has the advantages that in-situ transformation does not need displacement and tower replacement, and steel is saved to the maximum extent.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission lines, in particular to a design method and an application method of a vertical transition section on a heightened tower. Background Art

[0002] When assembling the tower of a transmission line, sometimes there is a temporary need to increase the height (for example, another line is also under construction and the line of this project needs to cross, but the original tower is not high enough), but at this time the foundation has been poured and the tower components have been processed. The conventional solution is to find another place near the original tower to assemble a new tower.

[0003] The disadvantages of conventional treatment methods are: 1. Due to the need to change the tower type, the previously processed tower components and the already poured foundation must be scrapped, affecting the construction period; 2. The reselected tower location involves new compensation, resulting in greater economic losses. In addition, a more suitable tower location may not be found on site, resulting in an unreasonable design plan.

[0004] In view of the current conventional method of finding another tower location to erect a new iron tower, the present invention develops a method of adjusting the height of the iron tower by setting a vertical tower transition section based on the stress characteristics of the iron tower, thereby avoiding the need for on-site relocation and the complete scrapping of the already cast foundation and iron tower components. In the scheme of the present invention, after adopting the heightened transition section, the iron tower is still calculated as a whole, and the components are appropriately replaced and strengthened when necessary to meet the safety of the iron tower, thereby ensuring the stability of the power grid.

[0005] This technical solution has been successfully applied in multiple power transmission line projects, with significant economic and social benefits. Summary of the invention

[0006] The present invention proposes a design method and an application method of a vertical transition section in a heightened tower, which has the advantages of in-situ reconstruction without the need for tower displacement and replacement, and maximum steel saving.

[0007] The present invention adopts the following technical solutions.

[0008] The application method of the upright transition section in the heightening tower is used for the heightening treatment of the transmission iron tower. In the application method, the transition section is a rectangular upright mesh column structure, and the upper and lower parts thereof are both provided with connection structures for connecting the tower body, and the connection structures include a joint connection plate and a joint main material connection angle steel; the application method for the heightening treatment of the transmission iron tower includes the following steps; Step S1: After confirming that the lower part of the tower is assembled and constructed, the node plates and diagonal materials at the top and bottom of the lower part of the tower used to connect the transition section are adjusted to fit the transition section connection structure; Step S2, inserting the transition section into the tower body of the original structure at the lower part of the iron tower by a crane or a holding rod, and overlapping the transition section with the top of the tower body of the original structure at the lower part of the iron tower by its lower connecting structure; Step S3: After confirming the stability of the connection structure between the transition section and the lower part of the tower, the upper tower body of the tower is connected to the connection structure at the upper part of the transition section to achieve overall heightening of the tower.

[0009] The design method of the vertical transition section in the heightening tower is used to design the transition section or the connection part of the iron tower mentioned above, and is characterized in that: in the design method, the upper end of the transition section is set as the B1 end, and the lower end is set as the B2 end; the top of the original iron tower is set as the A end, and the bottom end is set as the C end, and the transition section needs to be inserted into the B part of the original iron tower to increase the height of the iron tower, and the tower body and the tower legs adopt the same slope, that is, the three points ABC on the same side of the iron tower are collinear; the design method includes bearing capacity design and structural design; The bearing capacity design includes software modeling, load input and program calculation, that is, the structural design for heightening and modification is first placed in the professional tower design software for modeling and verification, and then the bearing capacity of the components and the overall stability of the structure are verified based on the software calculation results to see if they meet the requirements. If necessary, the components that exceed the limit are modified and strengthened; During the structural design, the transition section components and reinforcement components are reinforced according to the results of the bearing capacity design verification, and then the joint connection plates and joint main material connecting angles at the upper and lower parts of the transition section are supplemented.

[0010] The professional tower design software is SmartTower, and the modeling and verification process includes a quick modeling step, a calculation data entry and correction step, and a result calculation and analysis step; The operations in the rapid modeling step include creating absolute coordinate key points, creating body / leg connection tables, and quickly assembling towers using templates; The operations in the calculation data entry and correction steps include modifying the constraint, minimum axis, parallel axis information, modifying the bar material information, adding wind pressure polygon data, and adding load and working condition combination data; The operations in the result calculation and analysis steps include finite element analysis and verification, adjustment of rod specifications, addition of auxiliary material balance method calculation, output of tower command diagram and capital raising data.

[0011] When inputting loads, the loads on the tower are divided into line loads and tower body wind loads; line loads include conductor and ground wire loads; The nodes where the facilities are loaded are the load application points; the load application points are divided into ground wire load nodes and tower body wind load nodes; at the nodes where the ground wire load is applied, the load components along the three coordinate axes are input, that is, according to the actual situation of the tower to be reinforced, by inputting the key information of horizontal span, vertical span, rotation angle, nominal height and ground wire parameters, the software performs load calculation and generates a load file.

[0012] When inputting loads, use the smartload software to generate a load file XX.ttt after the load calculation.

[0013] When the program calculates, specifically: import the load calculation results in the tower design software smarttower, and perform result calculation and analysis; judge the stress condition of a certain rod by observing the stress ratio color and report of the component in the model. If there is an over-limit situation, red will appear. At this time, it is necessary to increase the specifications of the corresponding component or add bolts so that the component stress ratio does not exceed the limit and is judged to meet the design requirements. If this over-limit component is an original tower component that has been processed, it needs to be reprocessed; through this method, it can be verified whether the overall stability of the tower and the axial compression or axial tension bearing capacity of the component meet the design requirements.

[0014] When the program calculates, specifically: if the height increase value of the transmission tower heightening treatment is large, the local components at the bottom of the tower will be checked during the program calculation to determine whether they need to be strengthened.

[0015] In view of the stress and structural characteristics of the iron tower, the present invention has developed a design method for adjusting the height of the iron tower by setting a vertical tower transition section, thereby avoiding the need for on-site relocation and the complete scrapping of the already cast foundation and iron tower components. The solution can be effectively applied in scenarios where the iron tower needs to be raised, properly solving the problems of waste and delay. It has been successfully applied in power transmission line projects, with significant economic and social benefits, and has been well received by owners.

[0016] The technology proposed in the present invention has good technical advantages for the technical transformation business expansion of existing projects and the construction of new lines. For example, the State Grid Fujian Company's 35 kV and above transmission lines total more than 5,700 kilometers, of which iron towers account for the majority. The technology has great market potential for application.

[0017] The present invention is aimed at the current conventional treatment method of finding another tower location to erect a new iron tower. According to the stress characteristics of the iron tower, a method of adjusting the height of the iron tower by setting a vertical tower transition section is developed, thereby avoiding the on-site relocation and the complete scrapping of the already cast foundation and iron tower components. In the scheme of the present invention, after adopting the heightened transition section, the iron tower is still calculated as a whole, and the components are appropriately replaced and strengthened when necessary to meet the safety of the iron tower, thereby ensuring the stability of the power grid.

[0018] The technical solution of the present invention has been successfully applied in multiple power transmission line projects, with significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Attached Figure 1 It is a schematic diagram of the structure of the iron tower before and after the heightening process of the present invention; Attached Figure 2 It is a flow chart of the modeling and verification process of the present invention. DETAILED DESCRIPTION

[0020] As shown in the figure, the application method of the upright transition section in the heightening tower is used for the heightening treatment of the transmission iron tower. In the application method, the transition section is a rectangular upright mesh column structure, and its upper and lower parts are both provided with connection structures for connecting the tower body, and the connection structure includes a joint connection plate and a joint main material connection angle steel; the application method includes the following steps in the heightening treatment of the transmission iron tower; Step S1: After confirming that the lower part of the tower is assembled and constructed, the node plates and diagonal materials at the top and bottom of the lower part of the tower used to connect the transition section are adjusted to fit the transition section connection structure; Step S2, inserting the transition section into the tower body of the original structure at the lower part of the iron tower by a crane or a holding rod, and overlapping the transition section with the top of the tower body of the original structure at the lower part of the iron tower by its lower connecting structure; Step S3: After confirming the stability of the connection structure between the transition section and the lower part of the tower, the upper tower body of the tower is connected to the connection structure at the upper part of the transition section to achieve overall heightening of the tower.

[0021] The design method of the vertical transition section in the heightening tower is used to design the transition section or the connection part of the iron tower mentioned above, and is characterized in that: in the design method, the upper end of the transition section is set as the B1 end, and the lower end is set as the B2 end; the top of the original iron tower is set as the A end, and the bottom end is set as the C end, and the transition section needs to be inserted into the B part of the original iron tower to increase the height of the iron tower, and the tower body and the tower legs adopt the same slope, that is, the three points ABC on the same side of the iron tower are collinear; the design method includes bearing capacity design and structural design; The bearing capacity design includes software modeling, load input and program calculation, that is, the structural design for heightening and modification is first placed in the professional tower design software for modeling and verification, and then the bearing capacity of the components and the overall stability of the structure are verified based on the software calculation results to see if they meet the requirements. If necessary, the components that exceed the limit are modified and strengthened; During the structural design, the transition section components and reinforcement components are reinforced according to the results of the bearing capacity design verification, and then the joint connection plates and joint main material connecting angles at the upper and lower parts of the transition section are supplemented.

[0022] The professional tower design software is SmartTower, and the modeling and verification process includes a quick modeling step, a calculation data entry and correction step, and a result calculation and analysis step; The operations in the rapid modeling step include creating absolute coordinate key points, creating body / leg connection tables, and quickly assembling towers using templates; The operations in the calculation data entry and correction steps include modifying the constraint, minimum axis, parallel axis information, modifying the bar material information, adding wind pressure polygon data, and adding load and working condition combination data; The operations in the result calculation and analysis steps include finite element analysis and verification, adjustment of rod specifications, addition of auxiliary material balance method calculation, output of tower command diagram and capital raising data.

[0023] When inputting loads, the loads on the tower are divided into line loads and tower body wind loads; line loads include conductor and ground wire loads; The nodes where the facilities are loaded are the load application points; the load application points are divided into ground wire load nodes and tower body wind load nodes; at the nodes where the ground wire load is applied, the load components along the three coordinate axes are input, that is, according to the actual situation of the tower to be reinforced, by inputting the key information of horizontal span, vertical span, rotation angle, nominal height and ground wire parameters, the software performs load calculation and generates a load file.

[0024] When inputting loads, use the smartload software to generate a load file XX.ttt after the load calculation.

[0025] When the program calculates, specifically: import the load calculation results in the tower design software smarttower, and perform result calculation and analysis; judge the stress condition of a certain rod by observing the stress ratio color and report of the component in the model. If there is an over-limit situation, red will appear. At this time, it is necessary to increase the specifications of the corresponding component or add bolts so that the component stress ratio does not exceed the limit and is judged to meet the design requirements. If this over-limit component is an original tower component that has been processed, it needs to be reprocessed; through this method, it can be verified whether the overall stability of the tower and the axial compression or axial tension bearing capacity of the component meet the design requirements.

[0026] When the program calculates, specifically: if the height increase value of the transmission tower heightening treatment is large, the local components at the bottom of the tower will be checked during the program calculation to determine whether they need to be strengthened.

Claims

1. The method for applying the vertical transition section to the heightening tower is used for heightening the transmission tower, and is characterized by: In the application method, the transition section is a rectangular upright mesh column structure, the upper and lower parts of which are both provided with connection structures for connecting the tower body, and the connection structure includes a joint connection plate and a joint main material connection angle steel; the application method includes the following steps in the heightening process of the transmission tower; Step S1: After confirming that the lower part of the tower is assembled and constructed, the node plates and diagonal materials at the top and bottom of the lower part of the tower used to connect the transition section are adjusted to fit the transition section connection structure; Step S2, inserting the transition section into the tower body of the original structure at the lower part of the iron tower by a crane or a holding rod, and overlapping the transition section with the top of the tower body of the original structure at the lower part of the iron tower by its lower connecting structure; Step S3: After confirming the stability of the connection structure between the transition section and the lower part of the tower, the upper tower body of the tower is connected to the connection structure at the upper part of the transition section to achieve overall heightening of the tower.

2. A method for designing a vertical transition section in a tower heightening device, used for designing a transition section or a tower connection portion as claimed in claim 1, characterized in that: In the design method, the upper end of the transition section is set as end B1, and the lower end is set as end B2; the top of the original iron tower is set as end A, and the bottom end is set as end C. The transition section needs to be inserted into the B position of the original iron tower to increase the height of the iron tower. The tower body and the tower legs adopt the same slope, that is, the three points ABC on the same side of the iron tower are collinear; the design method includes bearing capacity design and structural design; The bearing capacity design includes software modeling, load input and program calculation, that is, the structural design for heightening and modification is first placed in the professional tower design software for modeling and verification, and then the bearing capacity of the components and the overall stability of the structure are verified based on the software calculation results to see if they meet the requirements. If necessary, the components that exceed the limit are modified and strengthened; During the structural design, the transition section components and reinforcement components are reinforced according to the results of the bearing capacity design verification, and then the joint connection plates and joint main material connecting angles at the upper and lower parts of the transition section are supplemented.

3. The design method of the vertical transition section in the heightening tower according to claim 2 is characterized in that: The professional tower design software is SmartTower, and the modeling and verification process includes a quick modeling step, a calculation data entry and correction step, and a result calculation and analysis step; The operations in the rapid modeling step include creating absolute coordinate key points, creating body / leg connection tables, and quickly assembling towers using templates; The operations in the calculation data entry and correction steps include modifying the constraint, minimum axis, parallel axis information, modifying the bar material information, adding wind pressure polygon data, and adding load and working condition combination data; The operations in the result calculation and analysis steps include finite element analysis and verification, adjustment of rod specifications, addition of auxiliary material balance method calculation, output of tower command diagram and capital raising data.

4. The design method of the vertical transition section in the heightening tower according to claim 2 is characterized in that: When inputting loads, the loads on the tower are divided into line loads and tower body wind loads; line loads include conductor and ground wire loads; The nodes where the facilities are loaded are the load application points; the load application points are divided into ground wire load nodes and tower body wind load nodes; at the nodes where the ground wire load is applied, the load components along the three coordinate axes are input, that is, according to the actual situation of the tower to be reinforced, by inputting the key information of horizontal span, vertical span, rotation angle, nominal height and ground wire parameters, the software performs load calculation and generates a load file.

5. The design method of the vertical transition section in the heightening tower according to claim 4 is characterized in that: When inputting loads, use the smartload software to generate a load file XX.ttt after the load calculation.

6. The design method of the vertical transition section in the heightening tower according to claim 4 is characterized in that: When the program calculates, specifically: import the load calculation results in the tower design software smarttower, and perform result calculation and analysis; judge the stress condition of a certain rod by observing the stress ratio color and report of the component in the model. If there is an over-limit situation, red will appear. At this time, it is necessary to increase the specifications of the corresponding component or add bolts so that the component stress ratio does not exceed the limit and is judged to meet the design requirements. If this over-limit component is an original tower component that has been processed, it needs to be reprocessed; through this method, it can be verified whether the overall stability of the tower and the axial compression or axial tension bearing capacity of the component meet the design requirements.

7. The design method of the vertical transition section in the heightening tower according to claim 6 is characterized in that: When the program calculates, specifically: if the height increase value of the transmission tower heightening treatment is large, the local components at the bottom of the tower will be checked during the program calculation to determine whether they need to be strengthened.

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