A hydraulic rod pulling device

Abstract

This utility model belongs to the field of utility pole removal technology and discloses a hydraulic pole removal device, including a lifting platform, a first lifting steel cable, and a second lifting steel cable. A support frame assembled from various parts is installed on the lifting platform. First fixing rings are fixedly connected to the four corners of the lifting platform. The first fixing rings are fixed to the ground by first inclined steel cables. Several second fixing rings are fixedly connected to the top of the support frame. The second fixing rings are fixed to the ground by second inclined steel cables. The support frame includes a main rod. The upper end of the main rod slides out from the inner top of the lifting platform. The main rod is assembled from several rods. A slot is opened at the top of the rod. A plug is fixedly connected to the bottom of the rod. A first connecting hole is opened on one side of the slot. A second connecting hole is opened on the plug. This utility model is easy to transport uphill and reuse through modular assembly. The equipment occupies little space and is lightweight. Moreover, it can be disassembled at the lower end of the cement pole without the need for high-altitude operations.

Description

Technical Field

[0001] This utility model relates to the field of utility pole removal technology, and in particular to a hydraulic pole removal device. Background Technology

[0002] In the 1970s and 1980s, in order to ensure the smooth construction of overhead power transmission lines, cement poles (concrete composite poles) were widely used due to their significant advantages such as low cost, ease of installation on mountains, and quick construction.

[0003] However, as their service life has increased, these concrete poles have gradually developed problems such as severe corrosion of hardware, concrete spalling, and crack formation, seriously endangering the safe operation of transmission lines and necessitating their renovation and removal. At the same time, with rapid economic development and continuous urban expansion, the poles, originally located in open areas, are now surrounded by numerous residential buildings and other structures, further increasing the necessity and urgency of their removal.

[0004] Currently, there are four main methods for removing utility poles: First, truck crane unloading, which relies on heavy machinery and is difficult to implement in narrow areas where such machinery cannot reach; second, overall felling, which is prone to collision damage to surrounding buildings and has very poor applicability in densely built-up areas; third, manual smashing, which requires breaking the pole layer by layer from the top and installing guy wires layer by layer, which is not only inefficient but also cumbersome and labor-intensive; and fourth, directional blasting, which has strict environmental requirements and is prone to safety accidents in areas surrounded by residential buildings, posing a very high risk.

[0005] Therefore, a hydraulic rod removal device is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a hydraulic rod removal device, thereby solving or at least alleviating one or more of the aforementioned problems and other issues existing in the prior art.

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] A hydraulic rod removal device, comprising:

[0009] A lifting platform, wherein a support frame assembled from parts is installed on the lifting platform;

[0010] The first lifting steel cable has a first guide pulley assembly installed on the support frame. The upper end of the first lifting steel cable passes through the first guide pulley assembly and is fixed on the support frame. A clamping mechanism for clamping the upper end of the rod to be dismantled is set inside the support frame. A first movable pulley is slidably installed on the first lifting steel cable. A first hook for suspending the clamping mechanism is installed on the first movable pulley.

[0011] The second lifting cable is provided with a second guide pulley assembly installed on the inner side of the lifting platform. The upper end of the second lifting cable passes through the second guide pulley assembly and is fixed inside the lifting platform. A second movable pulley is slidably installed on the second lifting cable. A second hook is fixedly installed on the second movable pulley. A binding rope is tied to the lower end of the rod to be dismantled. The second hook is hooked onto the binding rope.

[0012] Each of the four corners of the lifting platform is fixedly connected with a first fixing ring, which is fixed to the ground by a first inclined steel cable. The top of the support frame is fixedly connected with several second fixing rings, which are fixed to the ground by a second inclined steel cable.

[0013] According to the present invention, a hydraulic rod dismantling device is provided, wherein the support frame includes a main rod, the upper end of which slides out from the inner top of the lifting platform. Two sets of main rods are provided, each set of which is composed of several rods spliced ​​together. A slot is provided at the top of the rod, and a plug is fixedly connected to the bottom of the rod. A first connection hole is provided on one side of the slot, and a second connection hole is provided on the plug.

[0014] According to the present invention, a hydraulic rod removal device is provided, wherein a lifting mechanism for lifting the main rod is installed at the lower inner end of the lifting platform, the lifting mechanism includes a first hydraulic cylinder, the first hydraulic cylinder is installed on the inner side of the lifting platform, and a lifting plate is fixedly installed on the top of the piston rod of the first hydraulic cylinder.

[0015] In a hydraulic rod removal device according to the present invention, a locking mechanism for fixing the main rod is fixedly installed on the top of the lifting platform. The locking mechanism includes a second hydraulic cylinder, which is installed on the top of the lifting platform. A locking block is fixedly installed at the end of the piston rod of the second hydraulic cylinder. A locking groove is provided on the side of the rod body, and the locking block can be inserted into the locking groove.

[0016] In a hydraulic rod removal device according to the present invention, a guide sleeve is fixedly welded to the top of the lifting platform, and the locking block slides through the interior of the guide sleeve.

[0017] In a hydraulic rod dismantling device according to the present invention, a waist ring is fixedly connected between two main rods. The waist ring is disposed at the connection of the two rods. The waist ring includes two arc-shaped rods, and each end of the arc-shaped rod is fixedly connected to a connecting lug for connecting with the rod.

[0018] In a hydraulic rod removal device according to the present invention, the clamping mechanism includes a C-shaped seat, an electric cylinder is fixedly installed on the top of the C-shaped seat, a first V-shaped clamping block is fixedly connected to one end of the C-shaped seat near the electric cylinder, a second V-shaped clamping block is provided at the other end of the C-shaped seat away from the first V-shaped clamping block, the piston rod of the electric cylinder is fixedly connected to the second V-shaped clamping block by bolts, and anti-slip textures are provided on the inner walls of both the first V-shaped clamping block and the second V-shaped clamping block.

[0019] In a hydraulic rod removal device according to the present invention, a convex slider is fixedly installed at the bottom of the second V-shaped clamping block, and a concave groove is provided at the top of the C-shaped seat, wherein the convex slider is slidably installed in the concave groove.

[0020] In a hydraulic rod removal device according to the present invention, a lifting ring is fixedly installed on the first V-shaped clamping block.

[0021] In a hydraulic rod dismantling device according to the present invention, the lifting platform includes a support base, and two support bases are provided, each of which is fixedly welded with a splicing lug for splicing.

[0022] This utility model has at least the following beneficial effects:

[0023] The modular design facilitates transport uphill, allows for repeated use, minimizes equipment footprint, and is lightweight. Furthermore, it can be disassembled at the bottom of the concrete pole, eliminating the need for high-altitude operations. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0027] Figure 3 This is a partial exploded view of the upright pole of this utility model;

[0028] Figure 4 This is an exploded structural diagram of the waist ring of this utility model;

[0029] Figure 5 This is a schematic diagram of the clamping mechanism of this utility model;

[0030] Figure 6 for Figure 2A magnified structural diagram of part A in the diagram;

[0031] Figure 7 for Figure 2 A schematic diagram of the enlarged structure of part B in the diagram;

[0032] Figure 8 for Figure 2 A magnified structural diagram of part C in the diagram.

[0033] Explanation of icon numbers:

[0034] 1. Support base; 101. Splicing ear; 102. First fixing ring;

[0035] 2. Lifting mechanism; 201. First hydraulic cylinder; 202. Lifting plate;

[0036] 3. Main rod; 301. Rod body; 302. Slot; 303. Plug; 304. First connecting hole; 305. Second connecting hole; 306. Locking groove;

[0037] 4. Waist ring; 401. Arc-shaped rod; 402. Connecting lug;

[0038] 5. Clamping mechanism; 501. C-shaped seat; 502. Electric cylinder; 503. First V-shaped clamp; 504. Second V-shaped clamp; 505. Lifting ring;

[0039] 6. Locking mechanism; 601. Second hydraulic cylinder; 602. Locking insert; 603. Guide sleeve;

[0040] 7. First inclined cable; 8. Second inclined cable; 9. First lifting cable; 901. First guide pulley block; 902. First movable pulley;

[0041] 10. Second lifting cable; 1001. Second guide pulley block; 1002. Second movable pulley; 1003. Binding rope. Detailed Implementation

[0042] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0043] Please refer to Figures 1 to 8 As shown in the embodiments of this utility model,

[0044] A hydraulic rod removal device, comprising:

[0045] A lifting platform, on which a support frame is assembled;

[0046] The first lifting steel cable 9 is supported by a first guide pulley group 901. The upper end of the first lifting steel cable 9 passes through the first guide pulley group 901 and is fixed to the support frame. The clamping mechanism 5 for clamping the upper end of the cement pole is set inside the support frame. The first moving pulley 902 is slidably installed on the first lifting steel cable 9. The first moving pulley 902 is equipped with a first hook for suspending the clamping mechanism 5.

[0047] The second lifting cable 10 is installed inside the lifting platform with a second guide pulley block 1001. The upper end of the second lifting cable 10 passes through the second guide pulley block 1001 and is fixed inside the lifting platform. A second movable pulley 1002 is slidably installed on the second lifting cable 10. A second hook is fixedly installed on the second movable pulley 1002. A binding rope 1003 is tied to the lower end of the cement pole. The second hook is hooked onto the binding rope 1003.

[0048] Each of the four corners of the lifting platform is fixedly connected with a first fixing ring 102, which is fixed to the ground by a first inclined steel cable 7. Several second fixing rings are fixedly connected to the top of the support frame, which are fixed to the ground by a second inclined steel cable 8.

[0049] In this embodiment, the support frame includes a main rod 3. The upper end of the main rod 3 slides out from the inner top of the lifting platform. There are two sets of main rods 3. Both sets of main rods 3 are spliced ​​together by several rods 301. The top of the rod 301 is provided with a slot 302. The bottom of the rod 301 is fixedly connected with a plug 303. A first connection hole 304 is provided on one side of the slot 302. A second connection hole 305 is provided on the plug 303.

[0050] The main rod 3 is the main support structure of the device. The height can be adjusted by splicing several rods 301. When splicing, the plug 303 at the bottom of the rod 301 is inserted into the slot 302 of another rod and fixed through the first connecting hole 304 and the second connecting hole 305.

[0051] In this embodiment, the length of the rod 301 is 2.3 to 2.5 m.

[0052] In this embodiment, a lifting mechanism 2 for lifting the main rod 3 is installed at the lower inner side of the lifting platform. The lifting mechanism 2 includes a first hydraulic cylinder 201, which is installed on the inner side of the lifting platform. A lifting plate 202 is fixedly installed on the top of the piston rod of the first hydraulic cylinder 201.

[0053] The lifting mechanism 2 is the power device for raising and lowering the main pole 3. The first hydraulic cylinder 201 drives the piston rod to raise the lifting plate 202, thereby raising the main pole 3.

[0054] In this embodiment, a locking mechanism 6 for fixing the main rod 3 is fixedly installed on the top of the lifting platform. The locking mechanism 6 includes a second hydraulic cylinder 601, which is installed on the top of the lifting platform. A locking insert 602 is fixedly installed at the end of the piston rod of the second hydraulic cylinder 601. A locking groove 306 is provided on the side of the rod 301, and the locking insert 602 can be inserted into the locking groove 306.

[0055] When the main rod 3 is raised to the predetermined height, the second hydraulic cylinder 601 drives the locking block 602 to insert into the locking groove 306 of the rod body 301, thereby fixing the main rod 3.

[0056] In this embodiment, a guide sleeve 603 is fixedly welded to the top of the lifting platform, and a locking block 602 slides through the interior of the guide sleeve 603.

[0057] The guide sleeve 603 guides the sliding of the locking insert 602, ensuring that the locking insert 602 is accurately inserted into the locking groove 306, ensuring the stable and reliable operation of the locking mechanism 6, and effectively protecting the piston rod of the second hydraulic cylinder 601.

[0058] In this embodiment, a waist ring 4 is fixedly connected between the two main rods 3. The waist ring 4 is set at the connection of the two rods 301. The waist ring 4 includes two arc-shaped rods 401. Both ends of the arc-shaped rods 401 are fixedly connected with connecting ears 402 for connecting with the rods 301.

[0059] The waist ring 4 connects the two main rods 3 through the arc rod 401 and the connecting ear 402, and is set at the connection of the rod body 301 to enhance the overall stability of the main rods 3 after splicing, and can also limit the cement rod.

[0060] In this embodiment, the clamping mechanism 5 includes a C-shaped base 501, an electric cylinder 502 is fixedly installed on the top of the C-shaped base 501, a first V-shaped clamping block 503 is fixedly connected to one end of the C-shaped base 501 near the electric cylinder 502, and a second V-shaped clamping block 504 is provided at the other end of the C-shaped base 501 away from the first V-shaped clamping block 503. The piston rod of the electric cylinder 502 is fixedly connected to the second V-shaped clamping block 504 by bolts. The inner walls of the first V-shaped clamping block 503 and the inner walls of the second V-shaped clamping block 504 are both provided with anti-slip textures.

[0061] The clamping mechanism 5 is used to clamp the upper end of the cement pole. The electric cylinder 502 drives the second V-shaped clamp 504 to move towards the first V-shaped clamp 503, which, together with the anti-slip texture, clamps the cement pole to fix the upper end of the cement pole, providing a foundation for the suspension of the first lifting steel cable 9.

[0062] In this embodiment, a convex slider is fixedly installed at the bottom of the second V-shaped clamping block 504, and a concave groove is provided at the top of the convex seat 501, and the convex slider is slidably installed in the concave groove.

[0063] The convex slider and the concave groove cooperate to guide the movement of the second V-shaped clamp 504, ensuring that it moves stably closer to or further away from the first V-shaped clamp 503, ensuring that the clamping action is accurate and reliable, and also protecting the piston rod of the electric cylinder 502.

[0064] In this embodiment, a lifting ring 505 is fixedly installed on the first V-shaped clamping block 503.

[0065] The lifting ring 505 is used to connect with the first hook on the first lifting cable 9 to realize the connection between the clamping mechanism 5 and the first lifting system, so that the clamping mechanism 5 can be suspended and lifted.

[0066] In this embodiment, the lifting platform includes a support base 1, and two support bases 1 are provided. Each of the two support bases 1 is fixedly welded with a splicing ear 101 for splicing.

[0067] The lifting platform is composed of two support bases 1 connected by splicing ears 101 to realize the construction of the lifting platform and provide basic support for the entire device.

[0068] I. Assembly Process

[0069] 1. Elevating platform setup and fixation

[0070] Two support bases 1 are connected by high-strength bolts via splicing lugs 101 to form the foundation of the overall lifting platform. Then, the first fixing rings 102 at the four corners of the lifting platform are connected to the first inclined steel cables 7. The other end of the steel cables is fixed to prefabricated anchor points on the ground. The tension adjuster ensures that the four steel cables are evenly stressed, ensuring that the platform is level and does not wobble.

[0071] 2. Installation of lifting and locking mechanisms

[0072] A first hydraulic cylinder 201 is fixed at a preset position on the lower inner side of the lifting platform. The lifting plate 202 is horizontally installed on the top of the hydraulic cylinder piston rod to ensure that the lifting plate is not tilted when the piston rod extends or retracts. A locking mechanism 6 is installed at the position corresponding to the protrusion of the main rod 3 on the top of the lifting platform: the second hydraulic cylinder 601 is fixed to the top surface of the platform, and the guide sleeve 603 is welded to the lifting platform so that the locking block 602 slides through the sleeve and matches the position of the locking groove 306 on the side of the rod 301.

[0073] 3. Support frame assembly and fixing

[0074] The first section of the pole 301 is placed on the lifting plate 202. The first hydraulic cylinder 201 is activated to lift it until it partially extends out of the lifting platform. The second hydraulic cylinder 601 is operated to insert the locking block 602 into the locking groove 306 of the first section of the pole, completing the initial fixation. The second fixing ring is installed on the topmost pole 301, and the second inclined steel cable 8 is connected to the second fixing ring.

[0075] A first guide pulley group 901 is installed on the upper end of one of the rods 301. One end of the first lifting steel cable 9 is fixed to the other rod 301, and the other end passes through the first movable pulley 902 and the first guide pulley group 901 and is connected to the first electric winch. The first hook is suspended from the lifting ring 505 of the clamping mechanism 5.

[0076] Insert the plug 303 of the second rod body 301 into the slot 302 of the first rod body, align the first connecting hole 304 and the second connecting hole 305, insert the bolt and tighten it.

[0077] The piston rod of the second hydraulic cylinder 601 is retracted to release the fixation on the upper rod 301. Then, the first hydraulic cylinder 201 is operated to lift the lower rod 301 upwards, causing it to partially protrude from the lifting platform. The second hydraulic cylinder 601 is then operated to insert the locking block 602 into the locking groove 306 of the second rod section.

[0078] Install waist ring 4 at the connection of the two rods: wrap the two arc rods 401 around the main rod 3 and fix them with bolts through the connecting ears 402 to enhance the splicing strength.

[0079] Repeat the above steps until the main pole 3 reaches the required height. Finally, connect the second inclined steel cable 8 through the second fixing ring at the top of the support frame and fix it to the ground anchor point to form a three-dimensional stable structure with the first inclined steel cable.

[0080] 4. Installation of lifting system and clamping mechanism

[0081] A second guide pulley block 1001 is installed inside the lifting platform. One end of the second lifting steel cable 10 is fixed to the load-bearing beam inside the platform, and the other end passes through the second guide pulley block 1001, connects to the second movable pulley 1002, and then connects to the second electric winch.

[0082] II. Work Process

[0083] 1. Preparation for hugging and lifting

[0084] The starter cylinder 502 drives the second V-shaped clamp 504 to move toward the first V-shaped clamp 503 until the first V-shaped clamp 503 and the second V-shaped clamp 504 tightly grip the cement pole. The binding rope 1003 is then wrapped around the lower end of the cement pole.

[0085] 2. Coordinated lifting and attitude control

[0086] Simultaneously tighten the first lifting cable 9 and the second lifting cable 10 to slowly release the pole from the foundation constraint.

[0087] 3. Cement pole cutting and placement

[0088] After the cement pole is completely detached from the installation foundation, cut it at a height of 2.1-2.3 meters above the ground. Then loosen the second lifting cable 10 and lower the cut cement pole. Next, loosen the first lifting cable 9 to lower the cement pole and cut it again at a height of 2.1-2.3 meters above the ground. Then loosen the second lifting cable 10 and lower the cut cement pole. Repeat the above steps until the entire cement pole is cut.

[0089] III. Disassembly Process

[0090] 1. Dismantling of the lifting system

[0091] Loosen the fixed end of the second lifting cable 10, and remove the second hook, the second movable pulley 1002, and the cable in sequence. Remove the clamping mechanism 5 from the first hook.

[0092] 2. Disassembly of the support frame and waist ring

[0093] Release the second inclined steel cable 8, first remove the lowest rod 301, then control the piston rod of the first hydraulic cylinder 201 to extend and press against the bottom of the main rod 3, control the piston rod of the second hydraulic cylinder 601 to retract, remove the waist ring 4 near the support seat 1, then the piston rod of the first hydraulic cylinder 201 retracts, causing the main rod 3 to move down, and then remove the lowest rod 301 of the current main rod 3. Repeat the above steps to complete the disassembly of the support frame.

[0094] 3. Platform and foundation dismantling

[0095] Loosen the first inclined cable 7, remove the splicing lug 101 bolts of support seat 1, and separate the two support seats. Clean the oil stains from the surface of all components and store them according to their numbers.

[0096] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A hydraulic rod pulling apparatus, characterized by, include: A lifting platform, wherein a support frame assembled from parts is installed on the lifting platform; The first lifting cable (9) is mounted on the support frame with a first guide pulley group (901). The upper end of the first lifting cable (9) passes through the first guide pulley group (901) and is fixed on the support frame. The clamping mechanism (5) for clamping the upper end of the rod to be dismantled is set inside the support frame. The first moving pulley (902) is slidably mounted on the first lifting cable (9). The first moving pulley (902) is equipped with a first hook for suspending the clamping mechanism (5). The second lifting cable (10) is installed inside the lifting platform with a second guide pulley group (1001). The upper end of the second lifting cable (10) passes through the second guide pulley group (1001) and is fixed inside the lifting platform. A second movable pulley (1002) is slidably installed on the second lifting cable (10). A second hook is fixedly installed on the second movable pulley (1002). A binding rope (1003) is tied to the lower end of the rod to be dismantled. The second hook is hooked on the binding rope (1003). The lifting platform is fixedly connected to four corners with first fixing rings (102), which are fixed to the ground by first inclined steel cables (7). The top of the support frame is fixedly connected with several second fixing rings, which are fixed to the ground by second inclined steel cables (8).

2. A hydraulic rod pulling apparatus according to claim 1, wherein: The support frame includes a main rod (3), the upper end of which slides out from the inner top of the lifting platform. There are two sets of main rods (3), each set consisting of several rods (301) spliced ​​together. The top of the rod (301) is provided with a slot (302), and the bottom of the rod (301) is fixedly connected with a plug (303). A first connection hole (304) is provided on one side of the slot (302), and a second connection hole (305) is provided on the plug (303).

3. A hydraulic rod pulling apparatus as defined in claim 2, wherein: The lower inner side of the lifting platform is equipped with a lifting mechanism (2) for lifting the main rod (3). The lifting mechanism (2) includes a first hydraulic cylinder (201). The first hydraulic cylinder (201) is installed on the inner side of the lifting platform, and a lifting plate (202) is fixedly installed on the top of the piston rod of the first hydraulic cylinder (201).

4. The hydraulic rod disconnect apparatus of claim 2, wherein: The top of the lifting platform is fixedly equipped with a locking mechanism (6) for fixing the main rod (3). The locking mechanism (6) includes a second hydraulic cylinder (601). The second hydraulic cylinder (601) is installed on the top of the lifting platform. A locking block (602) is fixedly installed at the end of the piston rod of the second hydraulic cylinder (601). A locking groove (306) is provided on the side of the rod body (301). The locking block (602) can be inserted into the locking groove (306).

5. A hydraulic rod pulling apparatus as defined in claim 4, wherein: The top of the lifting platform is fixedly welded with a guide sleeve (603), and the locking block (602) slides through the interior of the guide sleeve (603).

6. A hydraulic rod pulling apparatus as defined in claim 2, wherein: A waist ring (4) is fixedly connected between the two main rods (3). The waist ring (4) is set at the connection of the two rod bodies (301). The waist ring (4) includes two arc-shaped rods (401). Both ends of the arc-shaped rods (401) are fixedly connected with connecting ears (402) for connecting with the rod bodies (301).

7. The hydraulic rod pulling device of claim 1, wherein: The clamping mechanism (5) includes a U-shaped seat (501), an electric cylinder (502) is fixedly installed on the top of the U-shaped seat (501), a first V-shaped clamp (503) is fixedly connected to one end of the U-shaped seat (501) near the electric cylinder (502), and a second V-shaped clamp (504) is provided at the other end of the U-shaped seat (501) away from the first V-shaped clamp (503). The piston rod of the electric cylinder (502) is fixedly connected to the second V-shaped clamp (504) by bolts. The inner walls of the first V-shaped clamp (503) and the inner walls of the second V-shaped clamp (504) are both provided with anti-slip textures.

8. A hydraulic rod pulling apparatus according to claim 7, wherein: The bottom of the second V-shaped clamp (504) is fixedly equipped with a convex slider, and the top of the convex seat (501) is provided with a concave groove, and the convex slider is slidably installed in the concave groove.

9. A hydraulic rod pulling apparatus as defined in claim 7, wherein: A lifting ring (505) is fixedly installed on the first V-shaped clamp (503).

10. A hydraulic rod pulling apparatus according to any one of claims 1 to 9, wherein: The lifting platform includes a support base (1), and there are two support bases (1). Each of the two support bases (1) is fixedly welded with splicing ears (101) for splicing.

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