Monitoring Device and Monitoring Method for Service Status of Embedded Channel of Catenary in Electrified Railway

Abstract

Monitoring device and monitoring method for service state of embedded channel of catenary in electrified railway, which can obtain effective data such as test data of tunnel concrete layer and corrosion degree of embedded channel in the observed section without damaging the secondary lining structure of the tunnel. The monitoring device includes an embedded channel body embedded in the tunnel lining concrete, an inverted T-shaped anchor rod and a channel steel member. The inverted T-shaped anchor rod is fixed on the bottom surface of the inverted embedded channel body by double-sided welding to form a combination body. The channel steel member is fixedly installed on the outer wall of the tunnel lining through chemical anchor bolts arranged at intervals along the length direction and fastening components installed at the outer ends of the chemical anchor bolts. Its bottom plate is in close contact with the outer wall of the tunnel lining and the exposed channel surface of the embedded channel body. The length, width and height of the channel steel member are all larger than the corresponding dimensions of the embedded channel body.

Description

Technical Field

[0001] The present invention relates to embedded channels for catenaries, and particularly to a monitoring device and a monitoring method for the service status of embedded channels for catenaries in electrified railways. Background Art

[0002] The embedded channel is a component embedded in the hidden project inside the tunnel lining, serving as a carrier for fixing equipment such as catenary suspension posts. Relying on the anchoring cohesive force formed between the anchor bolts in the embedded channel structure and the concrete of the channel body structure, the channel can firmly fix the catenary and transfer dynamic loads such as static loads on the catenary, vibrations generated during high-speed train operation, wind loads, or earthquakes to the concrete of the tunnel lining through the anchor bolts.

[0003] The notch and the inner groove of the embedded channel body are directly exposed to the air, and the remaining surfaces of the channel body and the anchor bolts are all coated in the tunnel lining concrete. The maximum buried depth is generally not more than 200 mm, and the embedded channel belongs to a shallow buried structural member. The embedded channel is generally more than 1 m away from the tunnel construction joint. In tunnels in areas with high humidity, the groundwater is rich, especially harmful substances such as chloride ions invade the back of the channel and the surface of the anchor bolts along the joint between the side wall of the channel and the concrete. Concrete is generally highly alkaline and is prone to generating a passivation film on the surface of embedded metal parts in concrete, which can effectively prevent the corrosion of embedded metal parts in concrete. However, the intrusion of external environmental erosion media will damage the passivation film on the surface of the embedded metal parts, and under the combined action of water and oxygen, a corrosion cell reaction will occur. For such shallow buried components as embedded channels, due to incomplete wrapping by concrete, compared with the steel bars in concrete, it is easier to have a corrosion cell reaction.

[0004] Therefore, the service environment of the embedded channel is relatively complex, and the corrosion resistance of the anti-corrosion layer of the embedded channel and the service life of the embedded channel cannot be directly judged according to the environmental atmospheric corrosion conditions. However, the existing embedded channels are integrated with the tunnel concrete through direct pouring, and during operation, it is impossible to completely take them out of the concrete without damaging the tunnel structure, so it is impossible to accurately know the true working conditions of the embedded channels inside the tunnel concrete. Therefore, a monitoring device and a monitoring method for the service status of embedded channels for catenaries in electrified railways are proposed for the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a monitoring device for the service status of embedded channels for catenaries in electrified railways to obtain effective data such as test data of the tunnel concrete layer in the observation section and the corrosion degree of the embedded channels without damaging the secondary lining structure of the tunnel.

[0006] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0007] The service status monitoring device for the embedded channel of the catenary in electrified railways of the present invention includes an embedded channel body buried in the tunnel lining concrete, and is characterized in that: it further includes an inverted T-shaped anchor bolt and a channel steel member. The inverted T-shaped anchor bolt is fixedly welded on the bottom surface of the embedded channel body on both sides to form a combined body. The channel steel member is fixedly installed on the outer wall of the tunnel lining through chemical anchor bolts arranged at intervals along the length direction and fastening components installed at the outer ends of the chemical anchor bolts. Its bottom plate is in close contact with the outer wall of the tunnel lining and the exposed channel surface of the embedded channel body. The length, width and height of the channel steel member are all greater than the corresponding dimensions of the embedded channel body;

[0008] An intermediate through hole for the T-shaped bolt to pass through is provided on the bottom plate of the channel steel member, and an installation hole for the chemical anchor bolt to pass through is provided on each side of the intermediate through hole;

[0009] Arc-shaped cuts are provided in the middle of the two vertical plates on both sides of the channel steel member.

[0010] Another technical problem to be solved by the present invention is to provide a monitoring method using the above-mentioned service status monitoring device for the embedded channel of the catenary in electrified railways. The method includes the following steps:

[0011] S01. Remove the gasket and nut on the outer extension end of the chemical anchor bolt, and remove the channel steel member 3;

[0012] S02. Install the head of the T-shaped bolt into the channel of the embedded channel body;

[0013] S03. Turn the channel steel member 180 degrees so that its channel cavity is opposite to the channel of the embedded channel body. The lower part of the T-shaped bolt passes through the intermediate through hole on the bottom plate of the channel steel member and install a nut;

[0014] S04. Tighten the nut so that the two vertical plates of the channel steel member 3 support on the outer wall of the tunnel lining;

[0015] S05. Continue to tighten the nut, which acts on the bottom plate of the channel steel member. Pull the combined body of the embedded channel body and the inverted T-shaped anchor bolt through the T-shaped bolt 7, and pull the combined body out of the tunnel lining concrete as a whole. At the same time, observe the corrosion degree of the embedded channel body and the inverted T-shaped anchor bolt through the arc-shaped cuts provided in the middle of the side plates of the channel steel member 3;

[0016] S06. After the observation is completed, remove the nut, remove the channel steel member 3 and take out the T-shaped bolt from the channel of the embedded channel body;

[0017] S07. Turn the channel steel member 180 degrees so that its bottom plate is opposite to the channel surface of the embedded channel body. Install a gasket and a nut on the outer extension end of the chemical anchor bolt 4, and tighten the nut. Push the combined body of the embedded channel body and the inverted T-shaped anchor bolt through the bottom plate of the channel steel member until the bottom plate of the channel steel member fits with the outer wall of the tunnel lining, and the combined body is reset.

[0018] The beneficial effects of the present invention are as follows: the tunnel can be completely taken out of the concrete without damaging the tunnel structure, and effective data such as the situation of the tunnel concrete layer and the corrosion degree of the embedded channel in the observation section can be obtained by using the inverted T-shaped anchor bolt and the embedded channel body, solving the problem that the corrosion situation cannot be known after the existing embedded channel is installed, and the installation is convenient and fast, the applicable range is wide, and the mechanical properties are stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of the monitoring device for the service state of the embedded channel of the catenary of electrified railways of the present invention;

[0020] Figure 2 is a front view (in use state) of the monitoring device for the service state of the embedded channel of the catenary of electrified railways of the present invention;

[0021] Figure 3 is a side view (in use state) of the monitoring device for the service state of the embedded channel of the catenary of electrified railways of the present invention;

[0022] Figure 4 is a front view of the inverted T-shaped anchor bolt in the monitoring device for the service state of the embedded channel of the catenary of electrified railways of the present invention;

[0023] Figure 5 is a top view of the channel steel member in the monitoring device for the service state of the embedded channel of the catenary of electrified railways of the present invention;

[0024] Figure 6 is a perspective view of another embodiment of the monitoring device for the service state of the embedded channel of the catenary of electrified railways of the present invention;

[0025] Figure 7 is a schematic diagram of the monitoring device for the service state of the embedded channel of the catenary of electrified railways of the present invention being drawn out from the tunnel lining concrete.

[0026] The figure shows the names of the main components and the corresponding marks: the embedded channel body 1, the inverted T-shaped anchor bolt 2, the base 21, the vertical section 22, the channel steel member 3, the middle through hole 31, the installation hole 32, the chemical anchor bolt 4, the nut 5, the gasket 6, the T-shaped bolt 7. DETAILED DESCRIPTION OF THE INVENTION

[0027] The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention.

[0028] Refer to Figures 1 to 3, the service status monitoring device for the embedded channel of the catenary in electrified railways of the present invention includes an embedded channel body 1 embedded in the tunnel lining concrete, and also includes an inverted T-shaped anchor rod 2 and a channel steel member 3. The inverted T-shaped anchor rod 2 is welded and fixed on the bottom surface of the inverted embedded channel body 1 in a double-sided manner to form a combination, which is embedded in the tunnel lining concrete. The channel steel member 3 is fixedly installed on the outer wall of the tunnel lining through chemical anchor bolts 4 arranged at intervals along the length direction and fastening components installed at the outer ends of the chemical anchor bolts 4, and its bottom plate is closely attached to the outer wall of the tunnel lining and the exposed channel surface of the embedded channel body 1; the length, width and height of the channel steel member 3 are all greater than the corresponding dimensions of the embedded channel body 1.

[0029] Referring to Figure 4 , the dimensions of the inverted T-shaped anchor rod 2 refer to the values of X, Y, Z, and D in the main dimension reference values of the I-shaped anchor rod in TB / T3329, which can fully simulate and reflect the corrosion condition on the surface of the anchor rod in the tunnel. Different from the I-shaped anchor rod, the upper device of the I-shaped anchor rod that is not connected to the embedded channel body 1 is cancelled for the inverted T-shaped anchor rod 2. The inverted T-shaped anchor rod 2 can reduce the friction between the monitoring device and the tunnel lining concrete. After the monitoring device is embedded in the tunnel lining concrete for a certain period of time, the monitoring device can be smoothly taken out of the tunnel lining concrete completely by a certain external force. It realizes obtaining effective data such as the test data of the tunnel concrete layer and the corrosion degree of the embedded channel in the observation section without damaging the tunnel structure.

[0030] The inverted T-shaped anchor rod 2 and the embedded channel body 1 are welded in a double-sided manner, and the welding process quality reaches Grade I. After the inverted T-shaped anchor rod 2 and the embedded channel body 1 are welded, the surface is then subjected to hot-dip galvanized anti-corrosion treatment. The hot-dip galvanizing of the embedded channel body 1 is not less than Grade 3, the local minimum thickness of the hot-dip galvanized layer should not be less than 80μm, and white rust shall not be generated. The anti-corrosion layer shall not bulge, peel or flake, ensuring that the manufacturing process, anti-corrosion performance, etc. of the monitoring device are consistent with the channels used for the catenary.

[0031] Referring to Figure 5 , a middle through hole 31 for the T-shaped bolt to pass through is provided on the bottom plate of the channel steel member 3, and an installation hole 32 for the chemical anchor bolt 4 to pass through is provided on each side of the middle through hole 31. Referring to Figure 2 and Figure 3 , the bottom plate of the channel steel member 3 is closely attached to the outer wall of the tunnel lining and the exposed channel surface of the embedded channel body 1, and the channel steel member 3 is connected with chemical anchor bolts 4 that play a role in positioning and protecting the channel steel member 3. The fastening component includes a gasket 6 and a nut 5. Two nuts 5 are installed at the extended end of the chemical anchor bolt 4 to make the gasket 6 closely attached to the inner wall of the bottom plate of the channel steel member 3. Referring to Figure 6 , for the convenience of observation, arc-shaped cuts are provided in the middle of the two vertical plates on both sides of the channel steel member 3.

[0032] Referring to Figure 3, the inverted T-shaped anchor bolt 2 includes a base 21 and an upright section 22, and the base 21 is double-sided welded to the embedded channel body 1. Refer to Figure 1 In the shown Embodiment 1, the cross-section of the upright section 22 is rectangular. Refer to Figure 6 In the shown and Embodiment 2, the cross-section of the upright section 22 is circular.

[0033] Refer to Figure 2 and 3 , the length, width and height of the channel steel member 3 are all greater than the corresponding dimensions of the embedded channel body 1, which provides an installation space for the chemical anchor bolt 4, ensures that the embedded channel body 1 fits against the outer wall of the tunnel lining, and enables the combined body of the embedded channel body 1 and the inverted T-shaped anchor bolt 2 buried in the tunnel lining concrete to be completely withdrawn conveniently.

[0034] Refer to Figure 7 , adopting the monitoring method of the above-mentioned monitoring device for the service state of the embedded channel of the electrified railway catenary, including the following steps:

[0035] S01. Remove the gasket 6 and nut 5 on the outer extension end of the chemical anchor bolt 4, and remove the channel steel member 3;

[0036] S02. Install the head of the T-shaped bolt 7 into the channel of the embedded channel body 1;

[0037] S03. Turn the channel steel member 3 by 180 degrees so that its channel cavity faces the channel of the embedded channel body 1, and the lower part of the T-shaped bolt passes through the middle through-hole 31 on the bottom plate of the channel steel member 3 and install the nut 5;

[0038] S04. Tighten the nut 5 so that the two vertical plates on both sides of the channel steel member 3 support on the outer wall of the tunnel lining;

[0039] S05. Continue to tighten the nut 5, which acts on the bottom plate of the channel steel member 3, and pull the combined body of the embedded channel body 1 and the inverted T-shaped anchor bolt 2 through the T-shaped bolt 7, and pull the combined body out of the tunnel lining concrete as a whole. At the same time, observe the corrosion degree of the embedded channel body 1 and the inverted T-shaped anchor bolt 2 through the arc-shaped cut provided in the middle of the side plate of the channel steel member 3;

[0040] S06. After the observation is completed, remove the nut 5, remove the channel steel member 3 and take out the T-shaped bolt 7 from the channel of the embedded channel body 1;

[0041] S07. Turn the channel steel member 3 by 180 degrees so that its bottom plate faces the channel surface of the embedded channel body 1, install the gasket 6 and nut 5 on the outer extension end of the chemical anchor bolt 4, tighten the nut 5, and push the combined body of the embedded channel body 1 and the inverted T-shaped anchor bolt 2 through the bottom plate of the channel steel member 3 until the bottom plate of the channel steel member 3 fits against the outer wall of the tunnel lining and the combined body is reset.

[0042] The above description only illustrates some principles of the service status monitoring device and method for the embedded channel of the catenary of electrified railways of the present invention by diagrams, and is not intended to limit the present invention to the specific structures and applicable scopes shown and described. Therefore, all possible corresponding modifications and equivalents that can be utilized belong to the scope of the patent applied for by the present invention.

Claims

1. The monitoring device for the service status of the embedded channel of the catenary of electrified railways includes an embedded channel body (1) embedded in the tunnel lining concrete. It is characterized in that: It further includes an inverted T-shaped anchor rod (2) and a channel steel member (3). The inverted T-shaped anchor rod (2) is fixed to the bottom surface of the embedded channel body (1) by double-sided welding to form a combined body. The channel steel member (3) is fixedly installed on the outer wall of the tunnel lining through chemical anchor bolts (4) arranged at intervals along the length direction and fastening components installed at the outer ends of the chemical anchor bolts (4). Its bottom plate is in close contact with the outer wall of the tunnel lining and the exposed channel surface of the embedded channel body (1). The length, width, and height of the channel steel member (3) are all greater than the corresponding dimensions of the embedded channel body (1). An intermediate through-hole (31) for a T-shaped bolt to pass through is provided on the bottom plate of the channel steel member (3), and an installation hole (32) for a chemical anchor bolt (4) to pass through is provided on each side of the intermediate through-hole (31). Arc-shaped cuts are provided in the middle of the two vertical plates on both sides of the channel steel member (3).

2. The monitoring device for the service status of the embedded channel of the catenary of electrified railways according to claim 1. It is characterized in that: The inverted T-shaped anchor rod (2) includes a base (21) and an erected section (22). The base (21) is double-sided welded to the embedded channel body (1), and the cross-section of the erected section (22) is rectangular or circular.

3. The monitoring device for the service status of the embedded channel of the catenary of electrified railways according to claim 1. It is characterized in that: The fastening component includes a gasket (6) and a nut (5). Two nuts (5) are installed at the outer extending end of the chemical anchor bolt (4) to make the gasket (6) closely contact the inner wall of the bottom plate of the channel steel member (3).

4. The monitoring method using the monitoring device for the service status of the embedded channel of the catenary of electrified railways according to any one of claims 1 to 3 includes the following steps: S01. Remove the gasket (6) and nut (5) at the outer extending end of the chemical anchor bolt (4), and remove the channel steel member (3). S02. Insert the head of the T-shaped bolt (7) into the channel of the embedded channel body (1). S03. Flip the channel steel member 3 by 180 degrees so that its channel cavity is opposite to the channel of the embedded channel body (1). The lower part of the T-shaped bolt passes through the intermediate through-hole (31) on the bottom plate of the channel steel member (3) and a nut (5) is installed. S04. Screw the nut (5) to make the two vertical plates of the channel steel member (3) support on the outer wall of the tunnel lining. S05. Continue to screw the nut (5), which acts on the bottom plate of the channel steel member (3). Through the T-shaped bolt (7), pull the combined body of the embedded channel body (1) and the inverted T-shaped anchor rod (2) to pull the combined body out of the tunnel lining concrete as a whole. At the same time, observe the corrosion degree of the embedded channel body (1) and the inverted T-shaped anchor rod (2) through the arc-shaped cuts provided in the middle of the side plates of the channel steel member (3). S06. After the observation is completed, remove the nut (5), remove the channel steel member (3) and take out the T-shaped bolt (7) from the channel of the embedded channel body (1). S07. Flip the channel steel member (3) by 180 degrees so that its bottom plate faces the channel surface of the embedded channel body (1). Install a gasket (6) and a nut (5) on the extended end of the chemical anchor bolt (4), and screw the nut (5). Through the bottom plate of the channel steel member (3), push the combination of the embedded channel body (1) and the inverted T-shaped anchor rod (2) until the bottom plate of the channel steel member (3) fits against the outer wall of the tunnel lining, and the combination is reset.

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