A method for reinforcing an angle steel tower can improve stability and bearing capacity

Abstract

The present application relates to a kind of angle steel tower that can improve stability and carrying capacity, comprising the following steps: angle steel tower body and vertical pole, both sides of angle steel tower body top are equipped with angle steel tower head, angle steel tower body is equipped with several layers of angle steel tower cross arm, several vertical poles are arranged in the center of angle steel tower body, and adjacent vertical poles are vertically spliced by flange;Each vertical pole is equipped with connecting plate, and the connecting plate of each vertical pole is pulled to angle steel tower head, angle steel tower cross arm or angle steel tower body by connecting member.The beneficial effects of the present application are: the magnetic repulsion force generated by the interaction of two electric coils in the jacking device is used to jacking the vertical pole, and accurate force control and directional control are provided for the jacking process, which is easy to operate, convenient and efficient, and cost-saving;The vertical pole being jacked exerts an upward pulling force on the angle steel tower cross arm through the connecting member, which reduces the vertical load on the angle steel tower cross arm and improves the stability and carrying capacity of the overall structure of the angle steel tower.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of improving the stability of angle steel towers, and particularly relates to an angle steel tower reinforcing method capable of improving stability and bearing capacity. BACKGROUND

[0002] With the development of the electric power industry, angle steel towers for power transmission lines have been widely used, and the healthy and stable operation of the angle steel towers is related to millions of households. In China, the annual demand for power transmission line towers is about 3.5-4 million tons, of which angle steel towers account for about 76%, accounting for the highest proportion in the market demand for power transmission line towers in China. In recent years, with the improvement of design level and the perfection of theoretical research, the design specification for angle steel towers for power transmission lines is constantly updated, and higher requirements are put forward for the design of angle steel towers. Some angle steel towers built in earlier years may not meet the use requirements. And with the development of electric power communication, power transmission lines are continuously added, and additional equipment needs to be added to the existing angle steel towers, resulting in an increase in the load of the angle steel towers, and therefore the angle steel towers need to be reinforced.

[0003] However, the traditional reinforcing method has the following problems. First, steel cables are used to outwardly tension the angle steel tower, and the steel cables are fixed to the ground to achieve the effect of reinforcing the angle steel tower. This method is not easy to operate and occupies a large area. Second, the cross-sectional area is increased. However, many connecting auxiliary materials of the angle steel tower are connected to the tower column by bolts, and the reinforcing device will interfere with the connecting auxiliary materials. It is time-consuming and inefficient to carry out construction at the interference site.

[0004] In order to overcome the above problems and facilitate the reinforcement of the angle steel tower, a reinforcing method for an angle steel tower capable of improving stability and bearing capacity is needed. SUMMARY

[0005] The purpose of the present application is to overcome the deficiencies in the prior art and provide a reinforcing method for an angle steel tower capable of improving stability and bearing capacity.

[0006] The angle steel tower capable of improving stability and bearing capacity comprises an angle steel tower body and a vertical rod, both sides of the top of the angle steel tower body are provided with an angle steel tower head, the angle steel tower body is provided with a plurality of layers of angle steel tower cross arms, a plurality of vertical rods are arranged at the center of the angle steel tower body, and adjacent vertical rods are vertically spliced through flanges. Each vertical rod is provided with a connecting plate, and the connecting plate of each vertical rod is connected to the angle steel tower head, the angle steel tower cross arm or the angle steel tower body through a connecting member.

[0007] The bottom end of the lowermost vertical rod is sleeved with a hollow steel pipe, the bottom of the hollow steel pipe is fixed to the ground, and the inner wall of the hollow steel pipe and the surface of the bottom end of the lowermost vertical rod are respectively provided with an electric coil for generating electromagnetic repulsion to lift the vertical rod. A hole is formed in the bottom end of the hollow steel pipe for pouring concrete into the hollow steel pipe after the vertical rod is lifted.

[0008] Preferably, the number of uprights is greater than the number of layers of the angle steel tower crossarm. The top of the top upright is connected to the tower head of the angle steel tower through a connecting member, and the tops of the other uprights are connected to the crossarm or tower body of the angle steel tower through a connecting member.

[0009] Preferably, the bottommost upright has a flange at its top, and the other uprights have flanges at both ends. The flanges at the ends of adjacent uprights are fixedly connected by bolts.

[0010] Preferably, each upright has a connecting plate below the flange at the top of the top, with holes on the connecting plate corresponding to the tower head and crossarm of the angle steel tower for connecting to the end of the connecting component.

[0011] Preferably, the bottom of the hollow steel pipe is fixed to the end plate, and the end plate is fixed to the ground by bolts.

[0012] This reinforcement method for angle steel towers, which can improve stability and load-bearing capacity, includes the following steps:

[0013] Step 1: Drill a slot at the top of the angle steel tower body, and hoist the upright pole through the slot at the center of the angle steel tower body;

[0014] Step 2: Use steel cables to hoist the uprights to the bottom of the previous upright section, connect the two upright sections with flanges, and hoist the connected uprights to a certain height simultaneously using steel cables; repeat Step 2 until all uprights are vertically connected.

[0015] Step 3: Install a hollow steel pipe on the bottom surface in the center of the angle steel tower body, lay an electric coil on the inner wall of the hollow steel pipe, adjust the height of the uprights with steel cables, and insert the bottom end of the uprights into the hollow steel pipe; install connecting components to connect each upright to the tower head, crossarm or body of the angle steel tower.

[0016] Step 4: Energize the coil to generate electromagnetic repulsion, which will lift the entire pole upward and maintain it at a certain height.

[0017] Step 5: Pour concrete into the hollow steel pipe through the hole to make the bottom of the pole and the hollow steel pipe form a whole, supporting the pole and stopping the power supply to the coil.

[0018] Preferably, step four considers the elasticity of the connecting components and the uprights, based on the vertical load F that needs to be reduced at the tower head of the angle steel tower. 1v The size determines the lifting distance of the upright; first, consider the elasticity of the connecting components, and calculate the movement distance of the top of the upright corresponding to the deformation of the connecting components under the action of tension F1, specifically:

[0019] The formula for calculating the tensile deformation Δl of the connecting member at the top of the angle steel tower under the action of tensile force F1 is as follows:

[0020]

[0021] In the formula, E is the elastic modulus of the connecting member, A is the cross-sectional area of ​​the connecting member, and F1 is the external force acting on the connecting member, derived from F... 1v The inclination angle of the connecting components is determined; l is the original length of the connecting components;

[0022] The movement distance of the top of the pole is calculated based on the length l+Δl after the connecting component is stretched.

[0023] Preferably, considering the elastic modulus of the upright, the axial force on the upright is 2F. 1v The calculation of the upright at 2F is based on the tensile deformation formula. 1v Tensile deformation under action; based on the rising distance at the top of the pole and the pole at 2F 1v The distance by which the upright is lifted is obtained by calculating the tensile deformation under the action.

[0024] The beneficial effects of this invention are:

[0025] 1) In this invention patent, the lifted uprights apply an upward tension to the crossarm of the angle steel tower through the connecting components, which reduces the vertical load on the crossarm of the angle steel tower and improves the stability and load-bearing capacity of the overall structure of the angle steel tower. When the angle steel tower is subjected to lateral loads, the uprights are connected to the tower body of the angle steel tower through the connecting components, which can improve the lateral stiffness and lateral stability of the angle steel tower.

[0026] 2) Furthermore, the angle steel tower reinforcement method for improving stability and load-bearing capacity provided by this invention patent uses a jacking device to generate magnetic repulsion through the interaction of two electric coils to jack the uprights, and provides accurate force control and directional control for the jacking process. It is easy to operate, convenient and efficient, and can save costs. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an angle steel tower;

[0028] Figure 2 A schematic diagram of the angle steel tower reinforcement structure;

[0029] Figure 3 This is a schematic diagram showing the connection between two uprights;

[0030] Figure 4 This is a schematic diagram of the lifting device;

[0031] Figure 5 for Figure 4 Sectional view of AA in the middle;

[0032] Figure 6 for Figure 2 Enlarged structural diagram at point A in the middle;

[0033] Figure 7 This is a schematic diagram of the hoisting of the first section of the upright;

[0034] Figure 8 This is a schematic diagram of the hoisting of the second section of the upright;

[0035] Figure 9 This is a schematic diagram of the hoisting of the third section of the upright;

[0036] Figure 10 This is a schematic diagram showing the fourth section of the upright after it has been hoisted.

[0037] Figure 11 This is a schematic diagram of the overall structural stress analysis of this invention patent;

[0038] Figure 12 This is a schematic diagram showing the force analysis of the first upright before and after it was lifted.

[0039] In the diagram: 1. Angle steel tower body; 2. Angle steel tower head; 3. Angle steel tower crossarm; 4. Connecting component; 5. Upright; 6. Bolt; 7. Flange; 8. Connecting plate; 9. Hole; 10. Electric coil; 11. Hollow steel pipe; 12. End plate; 13. Steel cable. Detailed Implementation

[0040] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0041] Example 1

[0042] As one example, such as Figures 1 to 3 , Figures 7 to 10 As shown, this type of angle steel tower, which can improve stability and load-bearing capacity, includes: an angle steel tower body 1 and uprights 5. Angle steel tower heads 2 are provided on both sides of the top of the angle steel tower body 1. The angle steel tower body 1 has several layers of angle steel tower crossarms 3. Several sections of uprights 5 are located at the center of the angle steel tower body 1. Adjacent uprights 5 are vertically spliced ​​together by flanges 7. The bottom upright has a flange 7 at its top, and the other uprights 5 have flanges 7 at both ends. The flanges 7 at the ends of two adjacent sections of uprights 5 are fixedly connected by bolts 6. A gasket is installed between the two connected flanges 7. After tightening the bolts 6, the surface of the gasket deforms and fills the uneven areas between the flanges 7, making the connection tight and leak-proof.

[0043] Upright pole 5 can be made of steel pipe or other materials with high compressive strength, and its cross-sectional shape can be circular, square, etc. Its main function is to transmit axial pressure. The bottom end of the lowest upright pole 5 is connected to a lifting device and a fixing device.

[0044] Each section of the upright 5 is equipped with a connecting plate 8, which is located on the upper part of each section of the upright 5 below the top flange 7. The connecting plate 8 has holes 9 corresponding to the tower head 2 and the crossarm 3 of the angle steel tower for connecting to the end of the connecting component 4. The connecting plate 8 of each section of the upright 5 is connected to the tower head 2, the crossarm 3 or the tower body 1 of the angle steel tower through the connecting component 4.

[0045] Connecting member 4, such as cables or steel strands, primarily provides tension to the angle steel tower, reducing the vertical load on the tower and improving its load-bearing capacity. When the angle steel tower is subjected to lateral loads, the upright 5 applies tension to the tower through connecting member 4, which can improve the tower's lateral stiffness and lateral stability.

[0046] The number of uprights 5 is greater than the number of stories of the angle steel tower crossarm 3. In this embodiment, for example... Figure 2 As shown, there are four sections of uprights 5. The top of the top upright 5 is connected to the tower head 2 of the angle steel tower through the connecting member 4. The tops of the two middle uprights 5 are connected to the crossarm 3 of the angle steel tower through the connecting member 4. The top of the bottom upright 5 is connected to the tower body 1 of the angle steel tower through the connecting member 4.

[0047] Example 2

[0048] As another embodiment, this embodiment two proposes a more specific angle steel tower that can improve stability and load-bearing capacity based on embodiment one, with the bottom end of column 5 using an electromagnetic repulsion mechanism for lifting.

[0049] Specifically, such as Figures 4 to 6 As shown, the electromagnetic repulsion mechanism includes a hollow steel pipe 11 and an end plate 12. The bottom of the hollow steel pipe 11 is fixed to the end plate 12, and the end plate 12 is fixed to the ground by bolts 6. An electric coil 10 is provided on the inner wall of the hollow steel pipe 11, and an electric coil 10 is also provided on the outer wall of the bottom end of the lowest upright 5, and inserted into the hollow steel pipe 11.

[0050] After being energized, the two coils 10 inside the upright 5 and the hollow steel pipe 11 generate magnetic fields. Based on Ampere's law, the two magnetic fields interact with each other. The current in the coil 10 causes the generation of a magnetic field in its surrounding area. The magnetic fields generated by the two coils 10 influence each other, forming an electromagnetic repulsion force, which generates a lifting force on the bottom of the upright 5.

[0051] By controlling factors such as the direction and intensity of the current in the two coils 10 and the distance between the wires in the coils 10, the magnitude and direction of the electromagnetic force can be controlled to provide the corresponding lifting force, so that the column 5 can rise and share the vertical load.

[0052] Hollow steel pipe 11 has a hole 9 at its bottom end, through which a pipe is laid. The pipe is used to pour concrete into hollow steel pipe 11 after the upright 5 is lifted. After the concrete inside hollow steel pipe 11 has hardened, the upright 5 embedded in the concrete of hollow steel pipe 11 and the concrete inside hollow steel pipe 11 form a whole to support the upright 5.

[0053] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0054] Example 3

[0055] As another embodiment, this third embodiment is proposed based on embodiments one and two.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0057] The reinforcement method for angle steel towers that can improve stability and load-bearing capacity includes the following steps:

[0058] Step 1: Open a slot at the top of the angle steel tower head 2 in the tower body 1 of the angle steel tower, and pass the steel cable through the slot to hoist the upright 5 at the center of the tower body 1 of the angle steel tower.

[0059] Step 2: Hoist the upright 5 to the bottom of the previous upright 5 using steel cables, connect the two upright 5 sections using flange 7, and hoist the connected upright 5 to a certain height simultaneously using steel cables; repeat step 2 until all upright 5 are vertically connected.

[0060] Step 3: Install a hollow steel pipe 11 on the bottom surface of the center of the angle steel tower body 1, and lay an electric coil 10 on the inner wall of the hollow steel pipe 11. Adjust the height of the upright 5 by steel cable and insert the bottom end of the upright 5 into the hollow steel pipe 11. Install connecting components 4 to connect each upright 5 to the angle steel tower head 2, the angle steel tower crossarm 3 or the angle steel tower body 1.

[0061] Step 4: Energize the coil 10 to generate electromagnetic repulsion, which will lift the entire pole 5 upward and maintain it at a certain height.

[0062] Considering the elasticity of connecting member 4 and upright 5, and based on the vertical load F that needs to be reduced at the tower head 2 of the angle steel tower... 1v The size determines the distance the bottom end of the upright pole 5 is lifted.

[0063] Step 5: Pour concrete into the hollow steel pipe 11 through the hole 9 to make the bottom end of the upright 5 and the hollow steel pipe 11 form a whole, supporting the upright 5 and stopping the power supply to the coil 10.

[0064] Example 4

[0065] As another embodiment, this embodiment four is proposed based on embodiment three. In step four, according to the vertical load F that needs to be reduced at the angle steel tower head 2, 1v The specific calculation method for determining the lifting distance of the bottom end of the upright pole 5 is as follows:

[0066] After the upright 5 is lifted, it is under compression, while the connecting member 4 is under tension. A force analysis is performed on the uppermost section of the upright 5, as shown in the schematic diagram below. Figure 12 As shown. The vertical load F to be reduced at the two points on the top of the angle steel tower. 1v It is the vertical component of the tensile force F1 acting on the connecting member, therefore the magnitude of F1 is easy to calculate. Connecting member 4 is... Figure 12 In the equation, segment AB undergoes tensile deformation under the action of tensile force F1, transforming into segment AC. The formula for calculating the tensile deformation Δl is:

[0067]

[0068] In the formula,

[0069] E is the elastic modulus of the connecting member 4, which is determined according to the material properties selected for the connecting member 4;

[0070] A is the cross-sectional area of ​​connecting member 4;

[0071] F is the external force on the connecting member 4, which is F1 in this example.

[0072] l represents the original length of the connecting member 4.

[0073] Figure 12 The length of the connecting member AB after deformation under the action of tensile force F1 is AC = AB + Δl = l + Δl. Since the original length of the connecting member AB can be measured, the angle of ∠ABD can also be measured. ∠ABD and ∠ABC are supplementary. Therefore...

[0074] ∠ABC = 180° - ∠ABD

[0075] In triangle ABC, given the angle ∠ABC and the lengths of AB and AC, use the triangle cosine formula in geometry:

[0076]

[0077] The length of side BC can be calculated, which is the length of movement l of the top of the upright 5 after the connecting member AB deforms under the action of tensile force F1. BC .

[0078] Depend on Figure 11 It is easy to see that the axial force on the upright 5BD is 2F. 1v Upright pole 5 under axial force 2F1v Under the action of [something], compressive deformation occurs. The calculation principle of its compressive deformation Δl1 is the same as that of the tensile deformation calculation principle of the connecting member 4. Therefore, it is easy to calculate the vertical rod 5, i.e. Figure 12 Compression deformation Δl1 in the middle BD segment

[0079] The rising height of the bottom of pole 5

Claims

1. An angle steel tower that can improve stability and load-bearing capacity, characterized in that, The utility model relates to a kind of angle steel tower and vertical pole, and angle steel tower top is equipped with angle steel tower head on both sides, angle steel tower is equipped with several layers of angle steel tower cross arm, several vertical poles are arranged in the center of angle steel tower, and adjacent vertical poles are vertically spliced by flange;Each vertical pole is equipped with connecting plate, and the connecting plate of each vertical pole is connected to angle steel tower head, angle steel tower cross arm or angle steel tower body by connecting member; The bottom end of the lowermost vertical pole is sleeved with a hollow steel pipe, the bottom of the hollow steel pipe is fixed to the ground, and the inner wall of the hollow steel pipe and the surface of the bottom end of the lowermost vertical pole are respectively provided with an electric coil for generating electromagnetic repulsion to lift the vertical pole;A hole is formed in the bottom end of the hollow steel pipe for pouring concrete into the hollow steel pipe after the vertical pole is lifted. The number of vertical poles is greater than the number of layers of angle steel tower cross arm, and the top of the topmost vertical pole is connected to angle steel tower head by connecting member, and the top of other vertical poles is connected to angle steel tower cross arm or angle steel tower body by connecting member.

2. The angle steel tower with improved stability and load bearing capacity according to claim 1, characterized in that, The top end of the bottommost vertical pole is provided with a flange, and the two ends of other vertical poles are each provided with a flange, and the flanges at the ends of adjacent two vertical poles are fixedly connected by bolts.

3. The angle steel tower with improved stability and load bearing capacity according to claim 1, characterized in that, The upper part of each vertical pole is provided with a connecting plate below the flange at the top end, and holes are formed in the connecting plate corresponding to angle steel tower head and angle steel tower cross arm for connecting with the ends of connecting members.

4. The angle steel tower with improved stability and load bearing capacity according to claim 3, characterized in that, The bottom of the hollow steel pipe is fixed to an end plate, and the end plate is fixed to the ground by bolts.

5. The angle steel tower with improved stability and load bearing capacity as claimed in claim 1, wherein, The utility model relates to a kind of angle steel tower and vertical pole, and angle steel tower top is equipped with angle steel tower head on both sides, angle steel tower is equipped with several layers of angle steel tower cross arm, several vertical poles are arranged in the center of angle steel tower, and adjacent vertical poles are vertically spliced by flange;Each vertical pole is equipped with connecting plate, and the connecting plate of each vertical pole is connected to angle steel tower head, angle steel tower cross arm or angle steel tower body by connecting member; 6. The method of reinforcing an angle steel tower to improve stability and load bearing capacity according to any one of claims 1 to 5, wherein, Step one, a hole groove is formed at the tower tip of angle steel tower head on angle steel tower body, and a steel cable passes through the hole groove to lift the vertical pole at the center of angle steel tower body; Step two, the vertical pole is lifted to the lower side of the previous vertical pole by the steel cable, and the two vertical poles are connected by flange, and the connected vertical poles are lifted by the steel cable; Step three, a hollow steel pipe is arranged on the bottom surface of the center of angle steel tower body, an electric coil is arranged on the inner wall of the hollow steel pipe, the height of the vertical pole is adjusted by the steel cable, the bottom end of the vertical pole is inserted into the hollow steel pipe, and connecting members are arranged to connect each vertical pole to angle steel tower head, angle steel tower cross arm or angle steel tower body; Step four, the electric coil is powered on to generate electromagnetic repulsion, the vertical pole is lifted as a whole and maintained at a certain height; Step five, concrete is poured into the hollow steel pipe through the hole to form a whole with the bottom end of the vertical pole, support the vertical pole, and stop powering on the electric coil. The formula for calculating the tensile deformation Δl of the connecting member at the angle steel tower head under the action of the tensile force F1 is 7. The method of claim 6, wherein the method is characterized by, The distance of the top of the vertical rod is determined according to the size of the vertical load F which needs to be reduced by the tower head of the angle steel tower 1v The distance of the top of the vertical rod is determined according to the size of the vertical load F which needs to be reduced by the tower head of the angle steel tower The moving distance of the top end of the vertical pole is calculated according to the length l+Δl of the connecting member after being stretched. In the formula, E is the elastic modulus of the connecting member, A is the cross-sectional area of the connecting member; F1 is the external force on the connecting member, which is determined by F 1v and the inclination angle of the connecting member; l is the original length of the connecting member; ​ 8. The method of claim 7, wherein the method is characterized by, Considering the elastic modulus of the vertical rod, the axial force on the vertical rod is 2F 1v , the tensile deformation of the vertical rod under the action of 2F 1v is calculated according to the tensile deformation formula; and the lifting distance of the vertical rod is calculated according to the lifting distance of the top end of the vertical rod and the tensile deformation of the vertical rod under the action of 2F 1v .

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