Method for bearing conducting wire to pass through bridge and culvert at low clearance

Abstract

The invention discloses a method for bearing a lead to pass through a bridge and a culvert at low clearance, which comprises the following steps of: 1, mounting anchoring bases, namely fixedly mounting the anchoring bases at the tops of two sides of the bridge and the culvert; secondly, a carrier cable is connected in parallel, a hanging ring is installed on one side of the lower anchoring base, a pestle ring rod is installed on one side of the hanging ring, a pestle head single-lug suspension insulator is installed on one side of the pestle ring rod, the carrier cable is installed on one side of the pestle head single-lug suspension insulator, and one end of the carrier cable is connected to a carrier wire in parallel through a plurality of wire clamps; and 3, droppers are additionally installed, and the two droppers are installed between the bearing wire and the contact wire of the bottom section of the bridge and culvert. According to the method, the problem of synchronous lifting of the bearing wire and the contact wire can be avoided, the service life of the contact wire and the pantograph is prolonged, the running speed of the train is not affected, and the running safety of the train is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of catenary conductor construction, in particular to a method for catenary conductor low-clearance crossing bridge and culvert. BACKGROUND

[0002] When the existing catenary conductor crosses the bridge and culvert, the method of reducing the height of the catenary conductor structure is often used to realize the passage. In order to follow the height of the catenary conductor in the bridge and culvert section, the height of the catenary conductor of the multi-span support at both ends needs to be adjusted synchronously. This scheme has obvious technical problems: Firstly, when the electric locomotive passes through, the lifting force of the pantograph will make the catenary conductor in the bridge and culvert lift synchronously, which will further compress the already tight clearance of the bridge and culvert, and even cause the catenary conductor to contact the bridge and culvert, resulting in danger.

[0003] Secondly, in order to improve the suspension working state, the number of sliding droppers needs to be increased, which not only increases the initial installation cost, but also makes the subsequent maintenance work such as inspection and replacement of the droppers more complicated.

[0004] Thirdly, it will cause the suspension elasticity of the catenary to deteriorate, the contact stability of the pantograph and the contact wire to decrease, and the vibration to intensify, which not only accelerates the wear and aging of the contact wire and the pantograph, but also may limit the train running speed. SUMMARY

[0005] The purpose of the present application is to provide a method for catenary conductor low-clearance crossing bridge and culvert, which can solve the technical problems of the existing scheme that the catenary conductor is lifted synchronously, which reduces the clearance of the bridge and culvert, increases the cost of sliding droppers, and accelerates the wear and aging of the contact wire and the pantograph.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: A method for catenary conductor low-clearance crossing bridge and culvert, the method comprising the following steps: Step one, install the anchor base, and fix the anchor base on the top of the bridge and culvert on both sides; Step two, connect the load-bearing cable, install a hanging ring on one side of the anchor base, install a pestle ring rod on one side of the hanging ring, install a pestle head single-ear suspension insulator on one side of the pestle ring rod, and install a load-bearing cable on one side of the pestle head single-ear suspension insulator, one end of the load-bearing cable is connected to the catenary conductor through a plurality of wire clamps; Step three, install the dropper, install two droppers between the catenary conductor and the contact wire in the bottom section of the bridge and culvert.

[0007] Preferably, in the step one, anchor bolts are pre-buried on both sides of the bridge and culvert, and the anchor base is fixedly installed on the pre-buried anchor bolts.

[0008] Preferably, expansion bolts are installed through the drilled holes on both sides of the bridge, and the lower anchor base is fixedly installed on the side wall of the bridge by the expansion bolts.

[0009] Preferably, in the second step, the conductor wire is disconnected at the bridge, and the disconnected conductor wire end is connected to the mallet head single-ear suspension insulator; and the messenger wire is connected at the bottom section of the bridge.

[0010] Preferably, in the second step, the length of the messenger wire connected to the conductor wire is not less than 200 mm.

[0011] Preferably, two droppers are installed between the messenger wire at the bottom section of the bridge and the contact wire.

[0012] In the present application, the lower anchor base is fixedly installed at the top of both sides of the bridge, and a stable messenger wire suspension system is constructed by using the hanging ring, mallet ring rod and insulator, so that the stress of the conductor wire (or the connected messenger wire) at the bridge section is directly transmitted to the bridge structure itself. This rigid suspension support method effectively limits the vertical lifting space of the conductor wire, so that even if the pantograph produces instantaneous lifting force, the conductor wire will not have obvious height change, which fundamentally guarantees that the bridge clearance meets the safety requirements, completely eliminates the dangerous situation of the conductor wire contacting the bridge, and significantly improves the operation safety of the catenary system.

[0013] Through the connection design of the messenger wire and the conductor wire, the stress transmission path of the catenary at the bridge section is optimized, and a large number of sliding droppers are not needed to adjust the suspension state, which reduces the procurement and installation cost of the additional component of the sliding dropper and reduces the initial engineering investment. On the other hand, the simplification of the number of components makes the subsequent regular inspection, fault diagnosis and dropper replacement maintenance work more efficient and convenient, reduces the workload and maintenance period of the maintenance personnel, and further reduces the long-term operation cost.

[0014] Through the cooperative action of the two droppers installed at the bottom section of the bridge and the messenger wire, the catenary suspension system forms a balanced elastic support structure. This design not only avoids the problem of excessive suspension elasticity, but also ensures the stable contact pressure between the pantograph and the contact wire, reduces the vibration amplitude and impact frequency during the contact of the two, and directly affects the following two aspects: one is to significantly slow down the wear and aging speed of the contact wire and the pantograph, prolong the service life of the core components, and reduce the replacement cost; the other is to provide reliable guarantee for the high-speed operation of the train, avoid the speed limitation caused by poor contact, and improve the operation efficiency of railway transportation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the local structure of the present application; In the figure: 1, the lower anchor base; 2, the bridge; 3, the load cable; 4, the hanging ring; 5, the pestle ring rod; 6, the pestle head single ear suspension insulator; 7, the wire clamp; 8, the load wire; 9, the suspension; 10, the contact wire. DETAILED DESCRIPTION

[0016] The application will be further described below in conjunction with the drawings: As Figure 1 and Figure 2 shown in a method for the load wire low clearance crossing bridge, the method comprises the following steps: Step one, the lower anchor base 1 installation, the top of the bridge 2 two sides fixed installation lower anchor base 1; specifically, the anchor bolt is pre-buried on the two sides of the bridge 2, and the lower anchor base 1 is fixedly installed on the pre-buried anchor bolt. In another embodiment, the expansion bolt is drilled and installed on the two sides of the bridge 2, and the lower anchor base 1 is fixedly installed on the side wall of the bridge 2 through the expansion bolt. The fixed installation of the lower anchor base 1 is realized.

[0017] Step two, the load cable 3 is connected, the hanging ring 4 is installed on one side of the lower anchor base 1, the pestle ring rod 5 is installed on one side of the hanging ring 4, the pestle head single ear suspension insulator 6 is installed on one side of the pestle ring rod 5, in the first embodiment, the load cable 3 is installed on one side of the pestle head single ear suspension insulator 6, and one end of the load cable 3 is connected to the load wire 8 through a plurality of wire clamps 7. In this way, the part of the load wire 8 crossing the bridge 2 is not disconnected from the external part, at this time, the wire clamp 7 adopts the pre-intersection type strain clamp.

[0018] In another embodiment, the load wire 8 is disconnected at the part crossing the bridge 2, the end of the disconnected load wire 8 is connected to the pestle head single ear suspension insulator 6, and the load cable 3 is connected at the bottom section of the bridge 2. At this time, the wire clamp 7 adopts the tapered sleeve type load cable terminal anchoring clamp.

[0019] The length of the load cable 3 connected to the load wire 8 is not less than 200 mm.

[0020] Step three, the suspension 9 is installed, in the first embodiment, two suspensions 9 are installed between the load wire 8 and the contact wire 10 at the bottom section of the bridge 2. In the second embodiment, two suspensions 9 are installed between the load cable 3 and the contact wire 10 at the bottom section of the bridge 2.

[0021] The above embodiments are only a number of descriptions of the concept and implementation of the application, and do not limit it, and under the concept of the application, the technical solutions without substantial changes are still within the protection scope.

Claims

1. A method of crossing a bridge or culvert with a low clearance for a conductor, characterized by: The method comprises the following steps: Step one, installing the lower anchor base (1), fixing and installing the lower anchor base (1) on the top of the bridge and culvert (2) on both sides; Step two, connecting the bearing cable (3), installing the hanging ring (4) on one side of the lower anchor base (1), installing the pestle ring rod (5) on one side of the hanging ring (4), installing the pestle head single ear suspension insulator (6) on one side of the pestle ring rod (5), installing the bearing cable (3) on one side of the pestle head single ear suspension insulator (6), and connecting the bearing cable (3) to the bearing conductor (8) through a plurality of wire clamps (7) at one end of the bearing cable (3); Step three, installing the dropper (9), installing two droppers (9) between the bearing conductor (8) and the contact wire (10) at the bottom section of the bridge and culvert (2).

2. The method of claim 1, wherein: In the step one, anchor bolts are pre-buried on both sides of the bridge and culvert (2), and the lower anchor base (1) is fixedly installed on the pre-buried anchor bolts.

3. The method of claim 1, wherein: In the step one, expansion bolts are drilled and installed on both sides of the bridge and culvert (2), and the lower anchor base (1) is fixedly installed on the side wall of the bridge and culvert (2) through the expansion bolts.

4. The method of claim 1-3, wherein: In the step two, the bearing conductor (8) is disconnected at the bridge and culvert (2), and the disconnected end of the bearing conductor (8) is connected to the pestle head single ear suspension insulator (6); the bearing cable (3) is connected at the bottom section of the bridge and culvert (2).

5. The method of claim 4, wherein: In the step two, the length of the bearing cable (3) connected to the bearing conductor (8) is not less than 200mm.

6. The method of claim 5, wherein: In the step two, the length of the bearing cable (3) connected to the bearing conductor (8) is not less than 200mm. In the step two, the length of the bearing cable (3) connected to the bearing conductor (8) is not less than 200mm. In the step two, the length of the bearing cable (3) connected to the bearing conductor (8) is not less than 200mm.

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