CN115475342A

CN115475342A - Power transmission tower and anti-falling foot nail

Info

Publication number: CN115475342A
Application number: CN202211157069.6A
Authority: CN
Inventors: 陈爽; 郑武略; 吴俊宏; 卢涛; 汪豪; 蓝庆方; 周道棒; 李欢; 苏力争; 陈昊; 杨运鑫; 林明杰; 谢中均; 吕发辉; 徐振锋; 詹朝祚; 梁耐心; 余炜煜; 张子建; 高劲扬
Original assignee: Guangzhou Bureau of Extra High Voltage Power Transmission Co
Current assignee: Guangzhou Bureau of Extra High Voltage Power Transmission Co
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2022-12-16
Anticipated expiration: 2042-09-22
Also published as: CN115475342B

Abstract

The invention provides a power transmission tower and an anti-falling body. Wherein, the one end and the foot of spiral piece are followed this body coupling of nail, and the spiral piece is equipped with the helical passage that sets up along the axis direction of spiral piece and the helical gap that sets up around the axis of spiral piece, and the helical gap corresponds the intercommunication with helical passage. The one end of bent part is connected with the other end of spiral piece, and the bent part orientation extends near one side of spiral piece, and the bent part sets up with the spiral piece interval, and when the spiral piece took place elastic deformation, the bent part can contradict the cooperation with the lateral wall of spiral piece. Prevent weighing down in-process that the foot nail falls at the operation personnel in this application, the spiral piece receives great impact force and takes place to warp for the bending member can conflict the cooperation with the lateral wall of spiral piece, and then makes the helical gap of spiral piece be the closure state and isolated with external, deviates from in preventing that the safety rope from following helical path, has improved the power transmission tower and has prevented weighing down the security and the reliability of foot nail.

Description

Power transmission tower and anti-falling foot nail

Technical Field

The invention relates to the field of power transmission, in particular to a power transmission tower and anti-falling foot nails.

Background

In the maintenance operation of the power transmission line, the tower climbing maintenance operation is a high-frequency high-risk operation content. In recent years, a product of 'falling-preventing foot nails' is developed for the safety problem of tower climbing, the product is provided with a spiral rotating structure at the tail of the foot nails, a safety rope can enter the rotating structure, the effect of providing a hanging point for the safety rope is achieved, and when an operating personnel falls carelessly, falling accidents can be prevented. However, in the actual use process, the traditional falling prevention foot nail can be greatly deformed under the action of falling impact force and a force arm, so that the safety rope and the rotating structure at the tail part of the falling prevention foot nail are in unhooking risk, and great hidden danger is brought to the operation safety of an operator.

Disclosure of Invention

Therefore, the power transmission tower and the anti-falling foot nail are needed to be provided for solving the problem that the rotating structure of the tail part of the safety rope and the anti-falling foot nail has the risk of unhooking in the using process of the traditional anti-falling foot nail.

The technical scheme is as follows:

in one aspect, a fall arrest foot peg is provided, comprising:

a foot nail body;

one end of the screw is connected with the foot nail body, the screw is provided with a spiral channel arranged along the axial direction of the screw and a spiral gap arranged around the axial line of the screw, and the spiral gap is correspondingly communicated with the spiral channel; and

the one end of curved member with the other end of spiral piece is connected, the curved member orientation is close to one side of spiral piece extends, the curved member with the spiral piece interval sets up, works as when the spiral piece takes place elastic deformation, the curved member can with the lateral wall conflict cooperation of spiral piece.

The technical solution is further explained below:

in one embodiment, the extending direction of the bending member is parallel to the axial direction of the spiral member.

In one embodiment, the extension length of the bending member is greater than or equal to the length of the screw member in the axial direction of the screw member.

In one embodiment, the other end of the bending part is provided with a hooking part extending towards the central axis of the spiral part, the hooking part is arranged at a distance from the spiral part, and the hooking part and the other end of the bending part can be matched to form a hooking structure.

In one embodiment, the bending part is arranged on one side of the spiral part close to the foot nail body.

In one embodiment, the helix is a helical segment that is rotated at least 270 ° about the central axis of the helical segment.

In one embodiment, the foot nail body comprises a connecting section and a skid-proof section, one end of the skid-proof section is connected with the connecting section, and the other end of the skid-proof section is connected with one end of the screw.

In one embodiment, the central axis of one end of the antiskid section and the central axis of the other end of the antiskid section are arranged at an included angle.

In one embodiment, one end of the spiral part is provided with a connecting part extending along the tangential direction of the spiral part, the connecting part is connected with the other end of the anti-skid section, and the spiral part and one end of the anti-skid section are both positioned on the same side of the other end of the anti-skid section.

On the other hand, a power transmission tower is provided, including tower body and at least two prevent weighing down the foot nail, each prevent weighing down the foot nail and follow the direction of height interval setting of tower body.

The power transmission tower in the embodiment and prevent weighing down the foot nail, during the use, will prevent weighing down foot nail fixed mounting on the tower body, be connected the safety belt that the safety rope dressed with the operation workman, when the operation personnel need scramble the tower body, the operation personnel pass the clearance between bending piece and the spiral part with the safety rope in proper order, and spiral clearance and remove to the helical coiled passage in, make the safety rope can and form the hanging point between the spiral part, when guaranteeing that the operation personnel takes place the accident, prevent weighing down the foot nail and hang the operation personnel on the tower body through safety rope and safety belt, the security of operation personnel operation on the tower body has been improved. When the operating personnel need to remove the cooperation of the safety rope and the anti-falling foot nail, the safety rope in the spiral channel sequentially passes through the spiral gap and the gap between the bent part and the spiral part, so that the safety rope can be separated from the anti-falling foot nail, and the operation is simple and convenient. For traditional anti-falling foot nail, anti-falling foot nail in the application is at the in-process that the operation personnel fall, the spiral piece receives great impact force and takes place to warp, make the spiral piece can drive the one side removal that the curved member orientation is close to the spiral piece, conflict the cooperation until the lateral wall of curved member and spiral piece, and then make the helical gap of spiral piece be the enclosed condition and isolated with external, deviate from in preventing safety rope follow helical passage, the risk of safety rope and spiral piece tow hook has been reduced, the security and the reliability of power transmission tower and anti-falling foot nail have been improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of an embodiment of a fall arrest pin;

FIG. 2 is a schematic view of the spiral and curved elements of FIG. 1;

FIG. 3 is a schematic structural view of another embodiment of the anti-falling foot pin;

FIG. 4 is a schematic view of the fall arrest pin of FIG. 3 from another perspective.

Description of reference numerals:

10. anti-falling foot nails; 100. a foot nail body; 110. a connecting section; 120. an anti-slip section; 200. a screw; 210. a spiral channel; 220. a helical gap; 230. a connecting portion; 300. a bending member; 400. a safety rope.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In one embodiment, the power transmission tower comprises a tower body and at least two anti-falling pins 10, wherein the anti-falling pins 10 are arranged at intervals along the height direction of the tower body. So, when the operation personnel need climb the tower body, the operation personnel are connected safety rope 400 with the safety belt of self wearing, are connected safety rope 400 and the foot nail 10 of preventing weighing down of corresponding position on the tower body for safety rope 400 and prevent weighing down and form between the foot nail 10 and hang the point in order to prevent that the operation personnel from falling. After the operating personnel climb a certain height on the tower body, the operating personnel remove the connection between the safety rope 400 and the anti-falling foot nail 10 at the corresponding position, connect the safety rope 400 with another anti-falling foot nail 10 above the anti-falling foot nail 10 at the corresponding position again, and repeat the steps of climbing and replacing the anti-falling foot nail 10 connected with the safety rope 400 to climb to the preset position of the tower body. When the falling accident of the operating personnel on the tower body occurs, the falling prevention foot nail 10 can hang the operating personnel through the safety rope 400 and the safety belt, so that the condition that the operating personnel directly fall to the ground to cause casualties is avoided, and the safety of the operation of the operating personnel is improved. For traditional power transmission tower who installs protection device that prevents falling, power transmission tower simple structure in this application, simple to operate, and the cost is lower. In addition, the anti-falling foot nail 10 in the embodiment can be applied to newly-built tower bodies and old tower bodies, and is high in applicability. Specifically, in this embodiment, the tower body is a power transmission tower.

Wherein, prevent weighing down the foot nail 10 and can be applied to tower body, high-rise building or other needs climbing positions. The present application will be described with reference to the application of the anti-falling nails 10 to power transmission towers.

Wherein, each prevent weighing down the pin 10 and set up along the direction of height interval of tower body, can be connected with the tower body through spiro union, joint, welding or other connected modes steadily, reliably.

Wherein, the specific setting position of each anti-falling foot nail 10 on the tower body can be flexibly adjusted according to the actual use requirement. For example, each anti-falling foot nail 10 is arranged on the tower body at intervals along a straight line, or each anti-falling foot nail 10 is arranged on the tower body in a left-right staggered manner.

As shown in fig. 1 and 2, in one embodiment, a fall arrest pin 10 is provided, including a pin body 100, a screw 200, and a flexure 300. Wherein, one end of the screw 200 is connected with the foot nail body 100, the screw 200 is provided with a spiral channel 210 arranged along the axial direction of the screw 200 and a spiral gap 220 arranged around the axial line of the screw 200, and the spiral gap 220 is correspondingly communicated with the spiral channel 210. One end of the bending part 300 is connected with the other end of the screw part 200, the bending part 300 extends toward one side close to the screw part 200, the bending part 300 is spaced apart from the screw part 200, and when the screw part 200 is deformed, the bending part 300 can be interference-fitted with the outer sidewall of the screw part 200.

The prevent weighing down pin 10 in the above-mentioned embodiment, during the use, will prevent weighing down pin 10 fixed mounting on the tower body, be connected safety rope 400 and the safety belt that the operation workman dressed, when the operation personnel need scramble the tower body, the operation personnel pass safety rope 400 in proper order the clearance between curved member 300 and spiral member 200, and spiral clearance 220 and remove to spiral channel 210 in, make safety rope 400 can form the hanging point with spiral member 200 between, when guaranteeing that the operation personnel takes place the accident of falling, prevent weighing down pin 10 can hang the operation personnel on the tower body through safety rope 400 and safety belt, the security of operation personnel operation on the tower body has been improved. When the worker needs to remove the matching between the safety rope 400 and the anti-falling pin 10, the safety rope 400 in the spiral channel 210 sequentially passes through the spiral gap 220 and the gap between the bending piece 300 and the spiral piece 200, so that the safety rope 400 can be separated from the anti-falling pin 10, and the operation is simple and convenient. For traditional in-process of preventing weighing down the foot nail, prevent weighing down the in-process that foot nail 10 falls at the operation personnel in this application, spiral 200 receives great impact force and takes place to warp, make spiral 200 can drive one side removal that curved member 300 orientation is close to spiral 200, conflict the cooperation until curved member 300 and spiral 200's lateral wall, and then make spiral 200's spiral clearance 220 be the encapsulated situation and isolated with the external world, deviate from in preventing safety rope 400 from spiral clearance 220, the risk of safety rope 400 and spiral 200 tow hook has been reduced, the security and the reliability of preventing weighing down foot nail 10 have been improved.

Wherein, the spiral channel 210 refers to a through hole of the spiral piece 200 arranged along the central axis direction; the helical gap 220 refers to a gap passage between two adjacent outer sidewalls of the screw 200 along a central axis direction of the screw 200.

Specifically, in the present embodiment, the anti-falling pin 10 is a rod, the pin body 100 is a pin segment, the screw 200 is a screw segment, the bending member 300 is a bending segment, and the pin segment, the screw segment and the bending segment are integrally formed. Thus, the strength and reliability of the anti-falling foot nail 10 are improved.

As shown in fig. 1 and 2, optionally, the helical member 200 is a helical segment that is rotated at least 270 ° about a central axis of the helical segment. Thus, the safety rope 400 can flexibly move in the spiral channel 210, so that the safety rope 400 is prevented from influencing climbing of operators, and the practicability of preventing the falling of the foot nails 10 is improved.

Wherein, the rotation angle of the spiral section around the central line axis of the spiral section can be flexibly adjusted according to the actual use requirement. For example, the rotation angle of the helical segment about the centerline axis of the helical segment is 360 °, 450 °, 720 °, or the like.

The inner diameter of the spiral channel 210, the distance between the spiral gaps 220, and the distance between the bending member 300 and the spiral member 200 can be flexibly adjusted according to the actual use requirement. Specifically, the inner diameter of the pitch of the helical gap 220 and the pitch between the curved member 300 and the helical member are each at least 12mm in size. In this manner, to facilitate passage of the safety line 400.

The bending part 300 extends toward a side close to the spiral part 200, and may extend at an included angle between the bending part 300 and a central axis of the spiral part 200, or may extend in parallel with the central axis of the spiral part 200 for the bending part 300.

As shown in fig. 2, further, the extending direction of the bending member 300 is arranged in parallel with the axial direction of the spiral member 300. Thus, when the screw 200 is deformed, the outer side wall of the curved part 300 can be attached to the outer side wall of the screw 200, so that the contact area between the screw 200 and the curved part 300 is increased, the reliability of the spiral gap 220 in a closed state is increased, and the safety and the reliability of the anti-falling foot nail 10 are improved.

As shown in fig. 2, optionally, the extension length of the bending member 300 (as indicated by the length of a in fig. 2) is greater than or equal to the length of the screw member 200 in the axial direction of the screw member 200 (as indicated by the length of B in fig. 2). Thus, the contact area between the spiral piece 200 and the bending piece 300 is further increased, so that the reliability of the spiral gap 220 in the closed state is further increased, and the safety and the reliability of the anti-falling foot nail 10 are improved.

Alternatively, the other end of the bent piece 300 is provided with a hooking part extending toward the central axis of the screw piece 200, and the hooking part and the other end of the bent piece 300 can cooperate to form a hooking structure. Thus, when the screw 200 deforms, the hooking structure can hook the outer side wall of the screw 200, so that the interference force between the hooking structure and the screw 200 is increased, the reliability of the spiral gap 220 in keeping the closed state is increased, and the safety and the reliability of the anti-falling foot nail 10 are improved. In addition, the safety line 400 can move into the space between the bending member 300 and the screw member 200 through the gap between the hooking part and the screw member 200, ensuring that the hooking part does not affect the movement of the safety line 400. In particular, in the present embodiment, the hooking portion may be integrally formed with the bending member 300.

As shown in fig. 1 and 2, in one embodiment, the bending member 300 is disposed on a side of the screw member 200 close to the nail body 100. Thus, the length of the anti-falling foot nail 10 is reduced, and the convenience of transportation and storage of the anti-falling foot nail 10 is improved. In addition, the bending piece 300 is positioned at the joint of the screw piece 200 and the foot nail body 100, so that the probability of interference between the extension part of the bending piece 300 and an external object is reduced, and the safety and the reliability of the anti-falling foot nail 10 are improved.

As shown in fig. 1, specifically, the screw element 200 rotates 360 ° around the central axis of the screw element 200, one end of the bending element 300 is connected to the other end of the screw element 200 along the tangential direction of the other end of the screw element 200, one end of the bending element 300 is disposed at an interval on one side of the screw element 200 away from the nail body 100, and the other end of the bending element 300 is disposed at an interval on the outer sidewall of the screw element 200 along the axial direction of the screw element 200. Thus, when an operator falls, the bending piece 300 can be quickly abutted and matched with the outer side wall of the spiral piece 200, and the safety of the anti-falling foot nail 10 is improved; meanwhile, the processing of the anti-falling foot nail 10 is also convenient.

As shown in fig. 1 and 3, in one embodiment, the foot nail body 100 includes a connecting section 110 and a non-slip section 120, one end of the non-slip section 120 is connected to the connecting section 110, and the other end of the non-slip section 120 is connected to one end of the screw member 200. Thus, the connecting section 110 can be stably and reliably fixedly connected with the tower body; and the operating personnel can grab the antiskid section 120 and step on the antiskid section 120 with the pedal with the hand when climbing the tower body, improved the convenience that the operating personnel climbed.

Further, the outer side wall of the connecting section 110 is provided with an external thread, the anti-falling foot nail 10 further comprises a first nut used for being connected with the external thread and a second nut used for being connected with the external thread, the tower body is provided with a connecting hole, and the connecting section 110 can sequentially penetrate through the first nut, the connecting hole and the second nut, so that the first nut and the second nut can be matched to enable the connecting section 110 to be connected with the tower body in a locking mode. Therefore, the reliability and the convenience of the connection between the anti-falling foot nails 10 and the tower body are improved.

Optionally, the anti-falling foot nail 10 further includes a third nut for being in threaded connection with the external thread, the second nut and the third nut are both disposed at a section of the tower body away from the anti-slip section 120, and the third nut and the second nut are in interference connection to prevent the second nut from being loose. The stability of connection between the anti-falling foot nail 10 and the tower body is improved.

Optionally, the anti-falling foot nail 10 further includes a first gasket, the first gasket is sleeved on the outer side wall of the connecting section 110, and the first gasket is disposed between the first nut and the tower body. Therefore, the reliability of connection between the anti-falling foot nail 10 and the tower body is improved.

Optionally, the anti-falling foot nail 10 further includes a second gasket, the second gasket is sleeved on the outer side wall of the connecting section 110, and the second gasket is disposed between the tower body and the second nut. Therefore, the reliability of connection between the anti-falling foot nail 10 and the tower body is improved.

As shown in fig. 3 and 4, in one embodiment, the central axis of one end of the antiskid segment 120 is disposed at an angle with the central axis of the other end of the antiskid segment 120. Thus, the applicability of the anti-falling foot nail 10 is improved.

Wherein, the angle of the included angle between the central axis of one end of the antiskid segment 120 and the central axis of the other end of the antiskid segment 120 can be flexibly adjusted according to the actual use requirement. For example, the angle between the central axis of one end of the antiskid segment 120 and the central axis of the other end of the antiskid segment 120 may range from 60 ° to 180 °. Specifically, an included angle between a central axis of one end of the non-slip segment 120 and a central axis of the other end of the non-slip segment 120 is 90 ° or 180 °, or the like.

As shown in fig. 3, further, one end of the screw 200 is provided with a connecting portion 230 extending along a tangential direction of the screw 200, the connecting portion 230 is connected to the other end of the non-slip segment 120, and one ends of the screw 200 and the non-slip segment 120 are located on the same side of the other end of the non-slip segment 120. In this manner, the length and volume of the anti-drop foot peg 10 are reduced to facilitate transportation and storage of the anti-drop foot peg 10. In particular to the present embodiment, the helix 200 is a helical segment that is rotated 270 ° along the centerline axis of the helical segment. Thus, the processing convenience of the anti-falling foot nail 10 is improved. Specifically, in the present embodiment, the bending member 300 may be spaced apart from the outer sidewall of the screw member 200, or may be spaced apart from the outer sidewall of the connection portion 230.

Alternatively, the outer side wall of the non-slip section 120 is provided with a friction portion. Thus, the friction force between the anti-skid section 120 and the operator is increased, and the safety of the anti-falling foot nail 10 is improved.

Wherein, the friction part can be a rough surface, a lug boss or other friction structures.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

It should also be understood that in explaining the connection relationship or the positional relationship of the elements, although not explicitly described, the connection relationship and the positional relationship are interpreted to include an error range which should be within an acceptable deviation range of a specific value determined by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, without limitation.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a prevent weighing down foot nail which characterized in that includes:

a foot nail body;

the one end of bent part with the other end of spiral piece is connected, the bent part orientation is close to one side extension of spiral piece, the bent part with spiral piece interval sets up, works as when the spiral piece takes place elastic deformation, the bent part can with the conflict cooperation of the lateral wall of spiral piece.

2. The fall arrest pin according to claim 1, wherein the direction of extension of the curved member is arranged parallel to the axial direction of the screw member.

3. The fall arrest pin according to claim 2, wherein the extension length of the curved member is greater than or equal to the length of the screw member in the axial direction of the screw member.

4. The fall arrest pin according to claim 3, wherein the other end of the curved member is provided with a hooking portion extending towards the central axis of the screw member, the hooking portion being spaced from the screw member, the hooking portion and the other end of the curved member being capable of cooperating to form a hooking structure.

5. The fall arrest pin according to any one of claims 1 to 4, wherein the flexure is provided on a side of the screw adjacent the pin body.

6. The fall arrest foot nail according to any one of claims 1 to 4 wherein the helix is a helix segment that is rotated at an angle of at least 270 ° about a central axis of the helix segment.

7. The anti-falling foot nail according to any one of claims 1 to 4, wherein the foot nail body comprises a connecting section and an anti-slip section, one end of the anti-slip section is connected with the connecting section, and the other end of the anti-slip section is connected with one end of the screw.

8. The anti-falling foot nail according to claim 7, wherein the central axis of one end of the anti-slip section and the central axis of the other end of the anti-slip section are arranged at an included angle.

9. The anti-falling foot nail according to claim 8, wherein one end of the spiral piece is provided with a connecting part extending along a tangential direction of the spiral piece, the connecting part is connected with the other end of the anti-slip section, and the spiral piece and one end of the anti-slip section are both positioned on the same side of the other end of the anti-slip section.

10. A power transmission tower, characterized in that, including a tower body and at least two anti-falling foot nails as in any one of claims 1 to 9, each of which is arranged at intervals along the height direction of the tower body.