CN105442935B - Helicopter laterally docks assembled iron tower suite of tools and assembled iron tower method - Google Patents

Abstract

Assembled iron tower suite of tools and assembled iron tower method are laterally docked the invention provides a kind of helicopter, laterally docking assembled iron tower suite of tools includes hanger (10) and hook (20) to the helicopter；Hanger (10) contains the first anchor ear (11) and tie rod arm (12), one end of tie rod arm (12) is fixedly connected with the first anchor ear (11), and the other end of tie rod arm (12) is fixed with insertion rod (13)；Link up with (20) and contain the second anchor ear (21), clamping groove plate (22) and guiding piece (23), it is provided with hook-shaped groove in clamping groove plate (22), insertion rod (13) can be led into the hook-shaped groove of clamping groove plate (22) and make hanger (10) and link up with (20) to connect and fix by guiding piece (23).The helicopter laterally docks assembled iron tower suite of tools and assembled iron tower method, solves the weight limitation of cross-arm lifting, realizes whole steel tower all using the construction of helicopter.

Description

Helicopter horizontal docking assembly iron tower tool kit and method for assembling iron tower

technical field

The invention relates to the field of ultra-high voltage power transmission, in particular to a tool kit for assembling iron towers by horizontal docking of helicopters, and a method for assembling iron towers by horizontal docking of helicopters.

Background technique

Facing the large-scale construction of UHV projects, helicopters have become an important choice to solve extreme construction problems in engineering construction, and to deal with prominent problems such as environmental protection, construction safety, and construction schedule pressure. It is necessary to promote the deepening application of helicopters in UHV engineering construction. In recent years, the State Grid Corporation of China has carried out the exploration and test work of helicopter construction in UHV AC and DC demonstration projects, and has achieved phased results. It has the technical and material basis to promote the deepening application of helicopters.

Helicopter assembling UHV steel pipe tower, the cross-arm hoisting is a difficult point, the cross-arm is too heavy, only the method of horizontal butt joint after segmentation can be used. When the helicopter lifts the cross-arm of the iron tower, due to the limitation of the lifting weight of the helicopter, the cross-arm needs to be separated, but how to realize the cross-arm docking becomes difficult for the helicopter.

Contents of the invention

In order to solve the problem that it is difficult for a helicopter to hoist and dock the iron tower cross arm, the present invention provides a helicopter horizontal docking assembly iron tower tool kit and a method for assembling the iron tower. The construction of the entire iron tower was hoisted by helicopters was realized.

The technical solution adopted by the present invention to solve the technical problem is: a tool kit for assembling iron towers for horizontal docking of helicopters, including hangers and hooks;

The hanger includes a first hoop and a drawbar arm, the drawbar arm is arranged above the first hoop, one end of the drawbar arm is fixedly connected to the first hoop, and the other end of the drawbar arm is fixed with an insertion rod;

The hook contains a second hoop, a slot plate and a guide. The slot plate and the guide are fixed above the second hoop. There is a hook-shaped groove in the slot plate, and the guide can guide the insertion rod into the slot. In the hook-shaped groove of the board, the hanger and the hook are clamped and fixed.

One end of the tie rod arm is fixedly connected to the first hoop through the first connecting piece, the first connecting piece includes an upper connecting plate and a lower connecting plate arranged in parallel up and down, and the upper connecting plate and the lower connecting plate are connected and fixed through the channel steel with the opening facing downward , the lower connecting plate is parallel to the axis of the first hoop, the lower connecting plate is fixedly connected to the first hoop, and the tie rod arm is fixedly connected to the upper connecting plate.

The tie rod arm is rod-shaped, along the axis of the first hoop, the length of the tie rod arm is 5 to 10 times the length of the first connecting piece, the tie rod arm is parallel to the axis of the first hoop, and the insertion rod is arranged along the horizontal direction. The insertion rod is perpendicular to the pull rod arm, and both ends of the insertion rod are exposed outside the pull rod arm.

The slot plate and the guide are fixed above the second hoop through the installation plate, the installation plate is parallel to the axis of the second hoop, the slot plate is perpendicular to the installation plate, the slot plate is parallel to the axis of the second hoop, and the The opening of the hook-shaped groove of the groove plate faces upwards.

The guide has a V-shaped structure with an opening facing upwards. The lower end of the guide is fixedly connected to the mounting plate. The guide includes a first guide rod and a second guide rod. The first guide rod includes an inclined section and a vertical section connected up and down in sequence. The vertical section is parallel to the slot plate, the vertical section is perpendicular to the axis of the second hoop, the angle between the inclined section and the vertical section is an obtuse angle, and the inclined section is inclined relative to the slot plate. The included angle between the two guide rods and the mounting plate is an acute angle.

The hook is also fixed with a baffle for stabilizing the insertion of the insertion rod and the card slot plate. Along the horizontal direction perpendicular to the axis of the second hoop, the baffle and guides are arranged on both sides of the card slot plate. The baffle and the card slot A groove is formed between the slot plates for the insertion of the other end of the pull rod arm, the lower end of the baffle plate is fixedly connected with the mounting plate, and the upper part of the baffle plate is provided with a guiding bevel for guiding the insertion rod into the hook-shaped groove of the slot plate , the lower end of the guide hypotenuse is provided with a protruding part for clamping the insertion rod.

The first hoop has a cylindrical structure. The first hoop includes an upper half-arc hoop and a lower half-arc hoop symmetrically arranged up and down. The upper half-arc hoop and the lower half-arc hoop are passed through bolts and nuts. The connection is fixed, and the structures of the first hoop and the second hoop are the same.

A method for assembling iron towers by horizontal docking of helicopters. The method for assembling iron towers by horizontally docking helicopters adopts the above-mentioned tool kit for assembling iron towers for horizontal docking by helicopters. The method for assembling iron towers by horizontally docking helicopters may include the following steps:

Step 1. Install the two hangers one by one on the ends of the two upper main materials of the outer cross arm through the first hoop, and install the two hooks on the outside of the tower body through the second hoop The outer ends of the two upper steel pipes on the proximal side of the cross-arm are to be connected, and the installation positions of the hanger and the hook need to meet when the insertion rod is inserted downward into the hook-shaped groove of the slot plate and the outer cross-arm is turned, the The to-be-connected ends of the two upper main materials and the to-be-connected outer ends of the two upper steel pipes on the proximal cross arm can be connected correspondingly;

Step 2. Use a helicopter to suspend the horizontally placed outer cross-arm above the near-side cross-arm. When the helicopter is suspended, the ends to be connected of the two upper main materials of the outer cross-arm are located at the two lower main materials of the outer cross-arm. above the end of the material to be connected, and then lower the outer cross arm until the insertion rod is inserted downward into the hook-shaped groove of the card slot plate;

Step 3. Continue to lower the outer cross arm, so that the outer cross arm rotates downward with the insertion rod as the axis, until the ends to be connected of the two lower main materials of the outer cross arm and the outer ends of the two lower steel pipes of the proximal cross arm The parts to be connected are connected correspondingly, and at the same time, the parts to be connected at the outer ends of the two upper steel pipes of the proximal cross arm are also connected correspondingly.

The helicopter adopts a square frame to suspend the outer cross-arm, and the square frame is connected to the outer cross-arm through four suspension ropes, two of which are located adjacent to the end to be connected of the outer cross-arm. The length of the two suspension ropes is 1.5 meters, and the other two of the four suspension ropes are located away from the end to be connected of the outer cross arm, and the length of the other two suspension ropes is 1 meter.

The outer ends of the two lower steel pipes on the proximal cross arm are provided with brackets at the parts to be connected. The brackets contain a third hoop and a plurality of ribs. The third hoop is connected and fixed to the outer ends of the lower steel pipes. A rib is arranged along the diameter direction of the third hoop, and the rib is fixed on the lower surface of the third hoop. The rib is L-shaped, and the rib contains a long side and a short side. Fixed connection, the long side of the rib plate is set along the axis of the third hoop and faces the outside of the proximal cross arm, the two sides and the middle of the rib plate are connected and fixed by arc-shaped plates, the long side of the rib plate is connected to the outer surface of the lower steel pipe The edges of the flanges to be connected are in contact.

The beneficial effect of the present invention is that the tool set and method for assembling iron towers by lateral docking of helicopters solve the weight limitation of cross arm hoisting, and realize the construction that the entire iron towers are all hoisted by helicopters.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Figure 1 is a front view of the hanger.

Figure 2 is a top view of the drawbar arm.

Fig. 3 is a left side view of the first hoop and the first connecting piece.

Fig. 4 is a front view of the hook.

Fig. 5 is a left side view of the hook.

Fig. 6 is a front view of the slot plate.

Fig. 7 is a front view of the baffle.

Fig. 8 is a front view of the first state when the helicopter is laterally docked and assembled with the cross-arm of the iron tower.

Fig. 9 is a front view of the second state when the helicopter is laterally docked and assembled with the cross-arm of the iron tower.

Fig. 10 is a front view of the third state when the helicopter is laterally docked and assembled with the cross arm of the iron tower.

Fig. 11 is a front view of the fourth state when the helicopter is laterally docked and assembled with the cross arm of the iron tower.

Fig. 12 is a front view of the fifth state when the helicopter is laterally docked and assembled with the cross-arm of the iron tower.

Fig. 13 is a top view of the fifth state when the helicopter is laterally docked and assembled with the cross arm of the iron tower.

Fig. 14 is a schematic diagram of the connection state of the hanger and the hook.

Fig. 15 is a front view of the bracket.

Figure 16 is a sectional view along the A-A direction in Figure 15

Figure 17 is the final assembled UHV transmission tower.

Reference signs in the figure: 1, outer cross arm; 2, proximal cross arm; 3, upper main material; 4, lower main material; 5, upper steel pipe; 6, lower steel pipe; 7, square frame;

10. Hanger; 11. First hoop; 12. Tie rod arm; 13. Insertion rod; 14. First connector; 15. Upper connecting plate; 16. Lower connecting plate;

20. Hook; 21. Second hoop; 22. Slot plate; 23. Guide piece; 24. Mounting plate; 25. First guide rod; 26. Second guide rod; 27. Baffle plate;

30, bracket; 31, the third hoop; 32, rib plate; 33, curved plate.

detailed description

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

A helicopter horizontal docking assembly iron tower tool kit, including a hanger 10 and a hook 20;

The hanger 10 contains a first hoop 11 and a tie rod arm 12, the tie rod arm 12 is arranged above the first hoop 11, one end of the tie rod arm 12 is fixedly connected with the first hoop 11, and the other end of the tie rod arm 12 is fixed with an insert rod 13;

The hook 20 contains a second hoop 21, a draw-in groove plate 22 and a guide 23, the draw-in groove plate 22 and the guide 23 are all fixed on the top of the second hoop 21, the draw-in groove plate 22 is provided with a hook-shaped groove, and the guide 23 can guide the insertion rod 13 into the hook-shaped groove of the slot plate 22 and make the hanger 10 and the hook 20 clamped and fixed, as shown in FIGS. 1 to 3 .

In this embodiment, one end of the tie rod arm 12 is fixedly connected to the first hoop 11 through two first connecting pieces 14. The first connecting piece 14 includes an upper connecting plate 15 and a lower connecting plate 16 arranged in parallel up and down. The plate 15 and the lower connecting plate 16 are welded and fixed by the channel steel with the opening facing downward, the lower connecting plate 16 is parallel to the axis of the first hoop 11, the lower connecting plate 16 is welded to the first hoop 11, and the tie rod arm 12 is connected to the upper connecting plate 15 are fixedly connected by bolts. The tie rod arm 12 is rod-shaped, and along the axial direction of the first hoop 11, the length of the tie rod arm 12 is 5 to 10 times the length of the first connecting piece 14, and the tie rod arm 12 is parallel to the axis of the first hoop 11. The rod 13 is arranged along the horizontal direction, the insertion rod 13 is perpendicular to the pull rod arm 12 , and both ends of the insertion rod 13 are exposed outside the pull rod arm 12 .

In this embodiment, the slotted plate 22 and the guide 23 are fixed above the second hoop 21 through the mounting plate 24 , the mounting plate 24 is parallel to the axis of the second hoop 21 , and the slotted plate 22 is perpendicular to the mounting plate 24 , the slot plate 22 is parallel to the axis of the second hoop 21, and the opening of the hook-shaped slot of the slot plate 22 faces upward, as shown in FIGS. 4 to 6 .

In this embodiment, the guide 23 is a V-shaped structure with an opening facing upwards, and the lower end of the guide 23 is welded to the mounting plate 24. The guide 23 includes a first guide rod 25 and a second guide rod 26. The first guide rod 25 Contains an inclined section connected up and down in sequence and a vertical section, the vertical section is parallel to the slot plate 22, the vertical section is perpendicular to the axis of the second hoop 21, the angle between the inclined section and the vertical section An obtuse angle, the inclined section is inclined relative to the slot plate 22 , and the angle between the second guide rod 26 and the mounting plate 24 is an acute angle, as shown in FIGS. 4 to 6 .

In this embodiment, the hook 20 is also fixed with a baffle 27 for stably inserting the insertion rod 13 and the slot plate 22. Along the horizontal direction perpendicular to the axis of the second hoop 21, the baffle 27 and the guide 23 It is arranged on both sides of the draw-in slot plate 22. A groove for the other end of the pull rod arm 12 to be inserted is formed between the baffle plate 27 and the draw-in slot plate 22. The lower end of the baffle plate 27 is welded to the mounting plate 24, and the upper part of the baffle plate 27 is There is a guide bevel for guiding the insertion rod 13 to slide into the hook-shaped groove of the slot plate 22. The lower end of the guide bevel is provided with a protrusion for clamping the insertion rod 13. The position of the protrusion is consistent with the hook shape. The upper end of the opening of the groove is corresponding, as shown in Fig. 4 to Fig. 7 .

In this embodiment, the first hoop 11 has a cylindrical structure, and the first hoop 11 includes an upper half-arc hoop and a lower half-arc hoop symmetrically arranged up and down. The arc-shaped hoop body is connected and fixed by bolts and nuts. The first hoop 11 and the second hoop 21 have the same structure, and the first hoop 11 and the second hoop 21 are used to connect with steel pipes or steel columns.

The following introduces a method for assembling iron towers by horizontally docking helicopters. The method for assembling iron towers for horizontally docking helicopters adopts the above-mentioned tool kit for assembling iron towers for horizontally docking helicopters. The method for assembling iron towers for horizontally docking helicopters includes the following steps:

Step 1. Install the two hangers 10 on the ends of the two upper main materials 3 of the outer cross arm 1 in one-to-one correspondence through the first hoop 11, and put the two hooks 20 into one-to-one correspondence through the second hoop 21 The outer ends of the two upper steel pipes 5 of the proximal cross-arm 2 outside the tower body are to be connected. When the outer cross arm 1 is turned inside and outside, the ends to be connected of the two upper main materials 3 of the outer cross arm 1 and the outer ends of the two upper steel pipes 5 of the proximal cross arm 2 can be connected correspondingly;

Step 2. Use a helicopter to suspend the horizontally placed outer cross arm 1 above the proximal cross arm 2. As shown in Figure 8, when the helicopter is suspended, the two upper main materials 3 of the outer cross arm 1 are to be connected. The end is located above the ends to be connected of the two lower main materials 4 of the outer cross arm 1, so that the outer cross arm 1 is lowered until the insertion rod 13 is inserted downward into the hook-shaped groove of the slot plate 22, as shown in Figure 9 and Figure 14 shown;

Step 3: Continue to lower the outer cross arm 1, and make the outer cross arm 1 rotate downward with the insertion rod 13 as the axis, until the ends to be connected of the two lower main materials 4 of the outer cross arm 1 and the two ends of the proximal cross arm 2 The parts to be connected at the outer ends of the lower steel pipes 6 are correspondingly connected, and at the same time the ends to be connected of the two upper main materials 3 of the outer cross arm 1 and the outer ends of the two upper steel pipes 5 of the proximal cross arm 2 are also connected correspondingly, as Figures 10 to 14 show.

In this embodiment, the helicopter uses a square frame 7 to suspend the outer cross arm 1, and the square frame 7 is connected to the outer cross arm 1 through four hanging ropes, two of which are located on the outside cross arm 1. 1 adjacent to the end to be connected, that is, the two hanging ropes on the left in Figure 8, the length of the two hanging ropes is 1.5 meters, and the other two of the four hanging ropes are located away from the outer cross arm 1 The position of the end to be connected, that is, the two suspension ropes on the right side in Figure 8, the length of the other two suspension ropes is 1 meter.

In this embodiment, a bracket 30 is provided at the outer ends of the two lower steel pipes 6 of the proximal cross arm 2 to be connected. The bracket 30 includes a third hoop 31 and a plurality of ribs 32. The third hoop 31 It is connected and fixed with the outer end of the lower steel pipe 6 to be connected. A plurality of ribs 32 are arranged along the diameter direction of the third hoop 31. The ribs 32 are fixed on the lower surface of the third hoop 31. The ribs 32 are L-shaped. The rib 32 has a long side and a short side, the short side of the rib 32 is fixedly connected to the third hoop 31, the long side of the rib 32 is arranged along the axis direction of the third hoop 31 and faces the outside of the proximal cross arm 2, Both sides and the middle part of the rib plate 32 are welded and fixed by an arc-shaped plate 33, and the inner surface of the long side of the rib plate 32 is in contact with the flange edge of the outer end of the lower steel pipe 6 to be connected, as shown in Figure 15 and Figure 16 Show. The final assembled UHV transmission tower is shown in Figure 17.

The above is only a specific embodiment of the present invention, and cannot limit the scope of the invention, so the replacement of its equivalent components, or the equivalent changes and modifications made according to the patent protection scope of the present invention, should still fall within the scope of this patent. category. In addition, the technical features and technical features, technical features and technical solutions, and technical solutions and technical solutions in the present invention can be used in free combination.

Claims (10)

1. A helicopter horizontal docking assembly iron tower tool kit is characterized in that, the helicopter horizontal docking assembly iron tower tool kit includes a hanger (10) and a hook (20); Hanger (10) contains first hoop (11) and pull bar arm (12), and pull bar arm (12) is arranged on the top of the first hoop (11), and one end of pull bar arm (12) is connected with the first hoop ( 11) Fixed connection, the other end of the pull rod arm (12) is fixed with an insertion rod (13); The hook (20) contains a second hoop (21), a slot plate (22) and a guide (23), and the slot plate (22) and the guide (23) are fixed above the second hoop (21) , the slot plate (22) is provided with a hook-shaped slot, and the guide (23) can guide the insertion rod (13) into the hook-shaped slot of the slot plate (22) and make the hanger (10) and the hook (20) ) is clamped and fixed; One end of the tie rod arm (12) is fixedly connected to the first hoop (11) through a first connecting piece (14), and the first connecting piece (14) includes an upper connecting plate (15) and a lower connecting plate (16) arranged in parallel up and down. ), the lower connecting plate (16) is welded with the first hoop (11). 2. the helicopter horizontal butt joint assembly iron tower tool set according to claim 1 is characterized in that, the upper connecting plate (15) and the lower connecting plate (16) are connected and fixed by the channel steel with the opening facing downwards, and the lower connecting plate (16) Parallel to the axis of the first hoop (11), the tie rod arm (12) is fixedly connected to the upper connecting plate (15). 3. The iron tower tool kit according to claim 2, characterized in that, the tie rod arm (12) is rod-shaped, and along the axial direction of the first hoop (11), the length of the tie rod arm (12) is 5 to 10 times the length of the first connector (14), the pull rod arm (12) is parallel to the axis of the first hoop (11), the insertion rod (13) is arranged along the horizontal direction, the insertion rod (13) and the pull rod arm (12) is vertical, and the two ends of insertion rod (13) are all exposed outside pull bar arm (12). 4. The iron tower tool set according to claim 1, characterized in that, the groove plate (22) and the guide (23) are fixed above the second hoop (21) through the mounting plate (24) , the mounting plate (24) is parallel to the axis of the second hoop (21), the groove plate (22) is perpendicular to the mounting plate (24), and the groove plate (22) is parallel to the axis of the second hoop (21), The opening of the hook-shaped groove of the draw-in groove plate (22) faces upwards. 5. The iron tower tool set according to claim 4, wherein the guide piece (23) is a V-shaped structure with the opening facing upward, and the lower end of the guide piece (23) is fixedly connected to the mounting plate (24) , the guide (23) includes a first guide rod (25) and a second guide rod (26), the first guide rod (25) contains an inclined section and a vertical section connected up and down in sequence, and the vertical section is connected with the slot plate (22) parallel, the vertical section is perpendicular to the axis of the second hoop (21), the angle between the inclined section and the vertical section is an obtuse angle, and the inclined section is inclined relative to the groove plate (22), The included angle between the second guide rod (26) and the mounting plate (24) is an acute angle. 6. The iron tower tool kit according to claim 4, characterized in that, the hook (20) is also fixed with a baffle plate ( 27), along the horizontal direction perpendicular to the axis of the second hoop (21), the baffle (27) and the guide (23) are arranged on both sides of the slot plate (22), the baffle (27) and the slot plate (22) form a groove for the other end of the pull rod arm (12) to be inserted, the lower end of the baffle (27) is fixedly connected with the mounting plate (24), and the top of the baffle (27) is provided with a rod for guiding the insertion (13) A guide hypotenuse that enters into the hook-shaped groove of the draw-in groove plate (22), the lower end of the guide hypotenuse is provided with a protrusion for clamping the insertion rod (13). 7. The iron tower tool set according to claim 1, characterized in that, the first hoop (11) is a cylindrical structure, and the first hoop (11) includes an upper half arc hoop arranged symmetrically up and down body and the lower half-arc hoop body, the upper half-arc hoop body and the lower half-arc hoop body are connected and fixed by bolts and nuts, and the first hoop (11) and the second hoop (21) have the same structure. 8. A method for assembling iron towers with horizontal docking of helicopters, characterized in that, the method for assembling iron towers for horizontal docking of helicopters has adopted the iron tower tool kit for assembling iron towers for horizontal docking of helicopters according to claim 1, and the method for assembling iron towers for horizontal docking of helicopters may further comprise the steps: Step 1. Install the two hangers (10) one by one on the ends to be connected of the two upper main materials (3) of the outer cross arm (1) through the first hoop (11), and attach the two hooks (20 ) through the second hoop (21) to be installed on the outer ends of the two upper steel pipes (5) of the proximal cross arm (2) outside the tower body to be connected one by one, the hanger (10) and the hook (20) The installation position needs to satisfy that when the insertion rod (13) is inserted downward into the hook-shaped groove of the slot plate (22) and the outer cross arm (1) is rotated, the two upper main materials (3) of the outer cross arm (1) The end to be connected can be correspondingly connected with the outer ends of the two upper steel pipes (5) of the proximal cross arm (2) to be connected; Step 2. Use a helicopter to suspend the horizontally placed outer cross arm (1) above the near side cross arm (2). When the helicopter is suspended, the two upper main materials (3) of the outer cross arm (1) The end to be connected is located above the ends to be connected of the two lower main materials (4) of the outer cross arm (1), and then the outer cross arm (1) is lowered until the insertion rod (13) is inserted downward into the slot plate (22 ) in the hook-shaped groove; Step 3. Continue to lower the outer cross arm (1), so that the outer cross arm (1) rotates downward with the insertion rod (13) as the axis, until the two lower main materials (4) of the outer cross arm (1) are The connection ends are connected with the outer ends of the two lower steel pipes (6) of the proximal cross arm (2) to be connected correspondingly, and at the same time the ends to be connected of the two upper main materials (3) of the outer cross arm (1) are connected to the near side cross arm (2). The outer ends of the two upper steel pipes (5) of the bearer (2) are also correspondingly connected to the parts to be connected. 9. The method for assembling iron towers according to claim 8, wherein the helicopter adopts a square frame (7) to suspend the outer cross arm (1), and the square frame (7) is connected to the outer cross arm by four suspension ropes. Bear (1) connection, two suspension ropes in the four suspension ropes are located at the position adjacent to the end to be connected of the outer cross arm (1), the length of the two suspension ropes is 1.5 meters, and the four suspension ropes The other two of them are located away from the position of the end to be connected of the outer cross arm (1), and the length of the other two suspension ropes is 1 meter. 10. The iron tower method according to claim 8, characterized in that, the outer ends of the two lower steel pipes (6) of the proximal cross arm (2) are provided with brackets (30) at the positions to be connected. The frame (30) contains a third hoop (31) and a plurality of ribs (32), the third hoop (31) is connected and fixed with the outer end of the lower steel pipe (6) to be connected, and the plurality of ribs (32) Arranged along the diameter direction of the third hoop (31), the rib (32) is fixed on the lower surface of the third hoop (31), the rib (32) is L-shaped, and the rib (32) contains long sides and short sides. side, the short side of the rib (32) is fixedly connected to the third hoop (31), and the long side of the rib (32) is arranged along the axis direction of the third hoop (31) and faces the side of the proximal cross arm (2). Outboard, both sides and the middle part of rib (32) are all connected and fixed by arc plate (33), and the long side of rib (32) contacts with the flange edge of the outer end of lower steel pipe (6) to be connected.