A three-way groove embedded in a catenary

Abstract

This utility model relates to the field of pre-embedded channels for electrified railway contact networks, specifically a three-way pre-embedded channel for contact networks. It includes a three-way channel body, force-bearing positioning ears, and sliding fasteners. The three-way channel body is a long strip structure with a cross-section composed of a left sliding groove, a right sliding groove, and a top sliding groove. The left and right sliding grooves are symmetrically arranged on both sides of the top sliding groove. A bottom slot is provided at the bottom of the top sliding groove. One end of the sliding fastener is a slider that slides with either the left or right sliding groove, and the other end is a screw. The force-bearing positioning ear is an L-shaped plate structure composed of a horizontal plate and a vertical plate. A through hole is provided on the vertical plate, and the screw end of the sliding fastener passes through the through hole and is fixedly connected to the vertical plate through a fastening assembly. An elongated hole is provided on the horizontal plate. This pre-embedded three-way channel for contact networks simplifies the installation process, improves accuracy, and enhances structural stability and reliability. Its design adapts to different working conditions, improves construction flexibility, reduces the probability of pre-embedded defects, reduces rectification costs, lowers construction and personnel safety risks, and effectively improves construction efficiency and quality.

Description

Technical Field

[0001] This utility model relates to the technical field of pre-embedded channels for overhead contact lines in electrified railways, specifically to a three-way pre-embedded channel for overhead contact lines. Background Technology

[0002] In the construction of electrified railways, the pre-embedded overhead contact line channels are key components ensuring the stability and safety of the pantograph-catenary system. The quality of the pre-embedded channels directly affects the installation accuracy and operational reliability of subsequent overhead contact line equipment. Currently, both domestically and internationally, the traditional construction method of drilling and positioning holes on a secondary lining trolley is commonly used for pre-embedded overhead contact line channels in tunnels.

[0003] In traditional construction techniques, workers fix and ground the tunnel channels within the confined space between the tunnel lining trolley and the secondary lining, followed by a series of processes including concrete pouring, tamping, and demolding, before finally completing the pre-embedded installation of the channels. However, this traditional construction method has many drawbacks.

[0004] First, the construction process is complex and inefficient. Construction workers must complete concealed works such as fixing, binding, welding, and grounding the channels within a limited space, making the operation difficult and requiring precise control. This not only increases the labor intensity of the construction workers but also prolongs the construction period.

[0005] Secondly, due to the limited construction space, the construction quality of concealed works such as channel fixing, binding, welding, and grounding is difficult to guarantee. For electrified railways with a high proportion of tunnels, the number of pre-embedded channels for the overhead contact system is huge. If the process control is not proper, common defects such as large-area pre-embedded channel tilting, offset, and excessive pre-embedding depth are prone to occur.

[0006] Further analysis reveals the following reasons for the deviation in the pre-embedded channel position when using the traditional trolley template hole-opening method:

[0007] Inaccurate hole positioning: After the channel is bolted to the trolley template, its position cannot be moved. This requires careful and accurate measurement and high-quality completion when drilling holes in the trolley template. However, due to space constraints, it is difficult to precisely control the hole position during on-site construction, resulting in deviations in the channel installation position.

[0008] The trolley's opening size is too large: The opening size should ideally be large enough to allow a T-bolt to pass through and 10mm larger than the minimum T-bolt clearance to reduce relative slippage between the channel and the trolley template. However, on site, for ease of construction, the trolley's opening size is 30mm or more larger than the minimum T-bolt clearance, resulting in significant relative slippage between the channel and the trolley template. This causes a large error in the channel's pre-embedded offset, failing to meet the installation requirements of the contact wire suspension column base.

[0009] Improper operation during trolley demolding: If on-site construction personnel forget to remove certain "T" bolts and forcibly demold the trolley, it may cause the pre-embedded channel to be pulled crooked or damaged, or even the trolley to be broken.

[0010] There are many types of channel models, which can easily lead to errors: Due to the large number of channel models and the large number of openings and locations on the trolley (up to 30 openings), the on-site construction, installation, inspection environment, and space constraints can easily cause problems such as incorrect pre-embedded channel types.

[0011] In summary, the traditional construction method of pre-embedded channels for overhead contact lines has many problems, and there is an urgent need to develop a new type of pre-embedded channel for overhead contact lines and its construction method to improve construction efficiency and quality, and reduce construction costs and risks. Summary of the Invention

[0012] To address the aforementioned issues, this utility model provides a pre-embedded three-dimensional channel for overhead contact lines. This pre-embedded three-dimensional channel simplifies the installation process, improves accuracy, and enhances structural stability and reliability. Its design adapts to different working conditions, increases construction flexibility, reduces the probability of pre-embedded defects, decreases rectification costs, reduces construction and personnel safety risks, and effectively improves construction efficiency and quality.

[0013] The technical solution of this utility model is as follows:

[0014] A three-way channel for pre-embedded contact wire includes a three-way channel body, a force-bearing positioning ear, and a sliding fastener. The three-way channel body is a long strip structure with a cross-section consisting of a left sliding groove, a right sliding groove, and a top sliding groove. The left and right sliding grooves are symmetrically arranged on both sides of the top sliding groove. A bottom empty groove is provided at the bottom of the top sliding groove. One end of the sliding fastener is a slider that slides with the left or right sliding groove, and the other end of the sliding fastener is a screw. The force-bearing positioning ear is an L-shaped plate structure consisting of a horizontal plate and a vertical plate. A through hole is provided on the vertical plate. The screw end of the sliding fastener passes through the through hole and is fixedly connected to the vertical plate through a fastening assembly. An elongated hole is provided on the horizontal plate.

[0015] Furthermore, the fastening assembly includes a nut, which engages with the screw thread to secure the sliding fastener to the vertical plate.

[0016] Furthermore, there are two nuts, namely a first nut and a second nut. The first nut is screwed against the side of the vertical plate, and then the second nut is screwed against the first nut.

[0017] Furthermore, the thickness of the second nut is less than the thickness of the first nut.

[0018] Furthermore, the contact surfaces of the first nut and the second nut are configured with a mutually matching serrated structure.

[0019] Furthermore, an elastic washer is provided between the first nut and the vertical plate.

[0020] Furthermore, a flat washer is provided between the first nut and the elastic washer.

[0021] Furthermore, the left slide groove, right slide groove, and top slide groove are T-shaped slide grooves, and the slider on the sliding fastener is a T-shaped block structure that slides and engages with the T-shaped slide groove.

[0022] Furthermore, at least two force-bearing positioning ears are provided on each side of the three-way channel body.

[0023] Furthermore, the cross-section of the bottom slot is rectangular.

[0024] The beneficial effects of this utility model are as follows:

[0025] 1. This utility model discloses a pre-embedded three-way channel for overhead contact lines. Through a sliding fit design between the sliding fastener and the channel body, construction workers do not need to perform complex welding operations. They only need to slide the sliding fastener into the corresponding groove and then fix it with the fastening components to complete the installation. This greatly simplifies the installation process, reduces construction steps, and thus improves construction efficiency. Due to the simplified installation process, construction workers can complete the channel installation work more quickly. Furthermore, the channel structure design eliminates the need for precise hole positioning and complex adjustments as in traditional methods, further shortening construction time and accelerating project progress.

[0026] 2. This utility model discloses a three-way channel for pre-embedded contact wire. The three-way sliding groove structure and the sliding fit design of the sliding fastener and the sliding groove allow the sliding fastener to slide and adjust within a certain range within the sliding groove. Even if there is a certain deviation in the position of the trolley opening, the construction personnel can adjust the installation position of the channel by sliding the sliding fastener, thereby compensating for the impact of inaccurate opening positioning and improving the installation accuracy of the channel. Addressing the problem of large relative sliding between the channel and the trolley template and large pre-embedded offset error due to excessively large trolley opening size, the tight fit between the sliding fastener and the sliding groove in this channel structure, as well as the reliable fixing of the fastening components, effectively reduces the relative sliding of the channel during installation and use. Even with a large opening size, the stability of the channel position can be guaranteed, meeting the installation requirements of the contact wire hanging column base and improving the installation accuracy of the pre-embedded channel.

[0027] 3. This utility model discloses a pre-embedded three-dimensional channel for overhead contact lines. The fastening assembly of this pre-embedded three-dimensional channel adopts a double-nut (first nut and second nut) structure. The first nut is screwed against the side of the vertical plate, and then the second nut is screwed against the first nut. This design increases the reliability of the fastening. During operations such as demolding of the trolley, even under large external forces, the double-nut structure can better prevent the bolts from loosening, ensuring a firm connection between the sliding fastener and the force-bearing positioning ear, thereby enhancing the stability of the entire channel structure and avoiding problems such as channel skewing and damage caused by bolt loosening in traditional construction. The contact surfaces of the first nut and the second nut are set with a matching serrated structure, which further enhances the friction between the nuts and prevents the nuts from loosening. At the same time, an elastic washer is set between the first nut and the vertical plate, and a flat washer is set between the first nut and the elastic washer. The elastic washer can play a role in buffering and shock absorption, while the flat washer can increase the contact area and distribute pressure. These designs improve the stability and reliability of the fastening assembly and extend the service life of the channel.

[0028] 4. This utility model discloses a pre-embedded three-way channel for overhead contact lines. The cooperative design of the T-shaped sliding groove and T-shaped block in the pre-embedded three-way channel makes the sliding fastener sliding more stably and smoothly in the sliding groove, while also increasing the load-bearing capacity of the channel structure. This allows the channel to adapt to different construction environments and installation requirements, improving construction flexibility. The horizontal plate of the force-bearing positioning ear is provided with an elongated hole. The design of the elongated hole can adjust the installation position of the force-bearing positioning ear to a certain extent. During construction, if there is a certain deviation between the actual site conditions and the design requirements, the construction personnel can adjust the installation position of the force-bearing positioning ear in the elongated hole to make the channel better adapt to the site conditions, improving the adaptability of the channel. At least two force-bearing positioning ears are provided on each side of the three-way channel body. The setting of multiple force-bearing positioning ears can increase the connection points between the channel and the surrounding structure, improve the load-bearing capacity and stability of the channel. At the same time, during construction, appropriate force-bearing positioning ears can be selected for installation according to actual needs, further improving construction flexibility and adaptability.

[0029] 5. This utility model discloses a pre-embedded three-way channel for overhead contact lines. This pre-embedded three-way channel improves installation accuracy and stability, reduces the probability of defects in the pre-embedded channel, and thus reduces the cost of subsequent rectification. The double nut fastening design and washer setting enhance the stability and reliability of the structure, reduce the risk of channel damage due to improper operation, and ensure construction safety. At the same time, the design of this channel structure also reduces the difficulty and labor intensity of construction personnel in confined spaces, and reduces the safety risks for construction personnel. Attached Figure Description

[0030] Figure 1This is a three-dimensional structural diagram of a pre-embedded three-dimensional channel in a contact wire according to an embodiment of the present utility model;

[0031] Figure 2 This is an exploded structural diagram of a pre-embedded three-dimensional channel in a contact wire according to an embodiment of the present utility model.

[0032] Figure 3 This is a three-dimensional structural schematic diagram of a force-bearing positioning ear for a pre-embedded three-way channel in a contact wire according to an embodiment of the present utility model.

[0033] The components represented by the various reference numerals in the diagram are:

[0034] This utility model comprises: 1. a three-way channel body; 11. a left sliding groove; 12. a right sliding groove; 13. a top sliding groove; 14. a bottom empty groove; 2. a force-bearing positioning ear; 21. a horizontal plate; 211. an oblong hole; 22. a vertical plate; 221. a through hole; 3. a sliding fastener; 4. an elastic washer; 5. a flat washer; 6. a first nut; and 7. a second nut. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0036] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0037] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0038] like Figure 1 and Figure 2 As shown, the pre-embedded three-way channel of the contact wire includes a three-way channel body 1, a force-bearing positioning ear 2, and a sliding fastener 3.

[0039] The three-way channel body 1 is a long strip structure with a cross-section composed of a left sliding groove 11, a right sliding groove 12, and a top sliding groove 13. The left sliding groove 11 and the right sliding groove 12 are symmetrically arranged on both sides of the top sliding groove 13. A bottom empty groove 14 is provided at the bottom of the top sliding groove 13, and the cross-section of the bottom empty groove 14 is rectangular. This three-way sliding groove structure allows for greater adjustment space during installation, enabling it to adapt to different construction environments and installation requirements. For example, when there is a certain deviation between the actual site conditions and the design requirements, the position of the channel can be adjusted by sliding the fasteners within the groove.

[0040] One end of the sliding fastener 3 is a slider that slides in conjunction with the left slide groove 11 or the right slide groove 12, and the other end is a screw. The left slide groove 11, the right slide groove 12 and the top slide groove 13 are T-shaped slide grooves, and the slider on the sliding fastener 3 is a T-shaped block structure that slides in conjunction with the T-shaped slide groove. The matching design of the T-shaped slide groove and the T-shaped block makes the sliding fastener slide more stably and smoothly in the slide groove, and also increases the load-bearing capacity of the channel structure.

[0041] like Figure 3 As shown, the force-bearing positioning ear 2 is an L-shaped plate structure composed of a horizontal plate 21 and a vertical plate 22. A through hole 221 is provided on the vertical plate 22. The screw end of the sliding fastener 3 passes through the through hole 221 and is fixedly connected to the vertical plate 22 through the fastening assembly. An elongated hole 211 is provided on the horizontal plate 21. The design of the elongated hole 211 can adjust the installation position of the force-bearing positioning ear to a certain extent and improve the flexibility of the channel installation.

[0042] The fastening assembly includes a nut, which engages with the screw thread to fix the sliding fastener 3 to the vertical plate 22. There are two nuts, namely a first nut 6 and a second nut 7. The first nut 6 is screwed against the side of the vertical plate 22 and then the second nut 7 is screwed against the first nut 6. The thickness of the second nut 7 is less than the thickness of the first nut 6. The contact surfaces of the first nut 6 and the second nut 7 are designed with a matching serrated structure. The double nut fastening design and the serrated contact surface design increase the reliability of the fastening. During operations such as demolding of the trolley, even if subjected to large external forces, the bolts can be better prevented from loosening.

[0043] An elastic washer 4 is provided between the first nut 6 and the vertical plate 22, and a flat washer 5 is provided between the first nut 6 and the elastic washer 4. The elastic washer 4 can play the role of buffering and shock absorption, while the flat washer 5 can increase the contact area and distribute pressure. These designs improve the stability and reliability of the fastening components and extend the service life of the channel.

[0044] At least two force-bearing positioning ears 2 are provided on both sides of the three-way channel body 1. The setting of multiple force-bearing positioning ears can increase the connection points between the channel and the surrounding structure, and improve the load-bearing capacity and stability of the channel.

[0045] The pre-embedded three-way channels in this contact wire system utilize a sliding fastener design with a sliding fit between the fastener and the channel body. This eliminates the need for complex welding operations; installation is completed simply by sliding the fastener into the corresponding groove and securing it with the fastening components. This significantly simplifies the installation process, reduces construction steps, and improves efficiency. The three-way groove structure and the sliding fit design allow the fastener to slide within a certain range. Even if there is a slight deviation in the trolley's opening position, workers can adjust the channel's installation position by sliding the fastener, compensating for inaccurate opening positioning and improving installation accuracy. Furthermore, the double-nut structure and washer settings of the fastening components ensure the stability of the installed channel and reduce pre-embedded offset errors caused by relative sliding. The double-nut fastening design, serrated contact surface, and washer settings enhance the stability and reliability of the fastening components, effectively preventing bolt loosening during trolley demolding and other operations. This design ensures a secure connection between the sliding fasteners and the load-bearing positioning ears, enhancing the stability of the entire channel structure and preventing problems such as channel misalignment and damage caused by loose bolts in traditional construction. The coordinated design of the T-shaped groove and T-block, the elongated hole design, and the multiple load-bearing positioning ears allow the channel to adapt to different construction environments and installation requirements, improving construction flexibility and adaptability. During construction, if there are deviations between the actual site conditions and design requirements, construction personnel can adjust the position of the sliding fasteners in the groove, the installation position of the load-bearing positioning ears in the elongated hole, and select appropriate load-bearing positioning ears for installation to better adapt the channel to site conditions. By improving installation accuracy and stability, the probability of defects in the pre-embedded channel is reduced, thereby reducing subsequent rectification costs. At the same time, it reduces the risk of channel damage due to improper operation, ensuring construction safety and reducing the difficulty and labor intensity of construction personnel operating in confined spaces, thus lowering the safety risks for construction personnel.

[0046] The installation process of the pre-embedded three-way channel of the contact wire is as follows:

[0047] Sliding fastener installation: Slide the slider end of the sliding fastener 3 into the left slide groove 11 or the right slide groove 12 of the three-way channel body 1 respectively, ensuring that the slider and the slide groove fit tightly and slide smoothly. During the installation process, the position of the sliding fastener in the slide groove can be adjusted according to actual needs.

[0048] Installation of the load-bearing positioning ear: Align the through hole 221 on the vertical plate 22 of the load-bearing positioning ear 2 with the screw end of the sliding fastener 3, so that the screw passes through the through hole. Then, put the flat washer 5 and the elastic washer 4 on the screw in sequence. Then, screw the first nut 6 against the side of the vertical plate 22 for initial tightening. Next, screw the second nut 7 against the first nut 6. Through the tightening action of the two nuts, the sliding fastener 3 is firmly fixed on the load-bearing positioning ear 2. When tightening the nuts, pay attention to controlling the tightening torque to ensure reliable tightening without damaging the nuts and screw.

[0049] Installation of multiple force-bearing positioning ears: According to design requirements, at least two force-bearing positioning ears 2 are installed on each side of the three-way channel body 1. During installation, it is essential to ensure the accurate positioning of each force-bearing positioning ear and that the spacing between them meets design requirements. Precise adjustments can be made using measuring tools to ensure the overall installation accuracy of the channel.

[0050] Hole positioning: Hole opening is carried out on the tunnel secondary lining trolley. Although the accuracy requirements for hole positioning of the pre-embedded three-way channel of this contact network are relatively low, it is still necessary to ensure the accuracy of the hole position as much as possible. The hole size should be able to allow the screw of the sliding fastener 3 to pass through and be 10-15mm larger than the minimum passing size of the screw, so as to avoid the relative sliding between the channel and the trolley template being too large due to the hole size being too large.

[0051] Channel installation: Place the assembled contact wire pre-embedded three-way channel on the trolley template, and adjust the position of the channel by sliding the sliding fastener 3 in the channel to match the position required by the design. Then, connect the horizontal plate 21 of the force positioning ear 2 to the trolley template or other fixed structure. This can be done by bolt connection or other suitable connection methods. During the connection process, ensure that the connection is firm to prevent the channel from shifting during construction.

[0052] Concrete pouring and compaction: After the trench is installed, concrete pouring and compaction are carried out. During the pouring process, care should be taken to avoid collisions and damage to the trench. When compacting, force should be applied evenly to ensure that the concrete is dense. At the same time, attention should be paid to whether the position of the trench changes. If necessary, adjustments should be made in a timely manner.

[0053] Trolley demolding: After the concrete reaches a certain strength, the trolley demolding operation is carried out. During the demolding process, care should be taken to avoid pulling and damaging the channel. If any loose nuts of individual sliding fasteners 3 are found, they should be tightened in time.

[0054] This three-way pre-embedded overhead contact line channel can effectively solve the problems existing in traditional overhead contact line pre-embedded channels, improve construction efficiency and quality, and provide a more reliable overhead contact line pre-embedded solution for electrified railway construction.

[0055] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A three-dimensional channel pre-embedded in a contact wire, characterized in that, The device includes a three-way channel body (1), a force-bearing positioning ear (2), and a sliding fastener (3). The three-way channel body (1) is a long strip structure with a cross-section consisting of a left sliding groove (11), a right sliding groove (12), and a top sliding groove (13). The left sliding groove (11) and the right sliding groove (12) are symmetrically arranged on both sides of the top sliding groove (13). A bottom empty groove (14) is provided at the bottom of the top sliding groove (13). One end of the sliding fastener (3) is connected to the left sliding groove. The slider is slidably engaged with the groove (11) or the right sliding groove (12). The other end of the sliding fastener (3) is a screw. The force-bearing positioning ear (2) is an L-shaped plate structure composed of a horizontal plate (21) and a vertical plate (22). A through hole (221) is provided on the vertical plate (22). The screw end of the sliding fastener (3) passes through the through hole (221) and is fixedly connected to the vertical plate (22) through the fastening assembly. An elongated hole (211) is provided on the horizontal plate (21).

2. The contact wire pre-embedded three-way channel as described in claim 1, characterized in that, The fastening assembly includes a nut, which engages with a screw thread to fix the sliding fastener (3) to the vertical plate (22).

3. The contact wire pre-embedded three-way channel as described in claim 2, characterized in that, There are two nuts, namely a first nut (6) and a second nut (7). The first nut (6) is screwed against the side of the vertical plate (22) and then the second nut (7) is screwed against the first nut (6).

4. The contact wire pre-embedded three-way channel as described in claim 3, characterized in that, The thickness of the second nut (7) is less than the thickness of the first nut (6).

5. The contact wire pre-embedded three-way channel as described in claim 3, characterized in that, The contact surfaces of the first nut (6) and the second nut (7) are configured with a mutually matching serrated structure.

6. The contact wire pre-embedded three-way channel as described in claim 3, characterized in that, An elastic washer (4) is provided between the first nut (6) and the vertical plate (22).

7. The contact wire pre-embedded three-way channel as described in claim 6, characterized in that, A flat washer (5) is provided between the first nut (6) and the elastic washer (4).

8. The contact wire pre-embedded three-way channel as described in claim 1, characterized in that, The left slide groove (11), right slide groove (12) and top slide groove (13) are T-shaped slide grooves, and the slider on the sliding fastener (3) is a T-shaped block structure that slides with the T-shaped slide groove.

9. The contact wire pre-embedded three-way channel as described in claim 1, characterized in that, At least two force-bearing positioning ears (2) are provided on both sides of the three-way channel body (1).

10. The contact wire pre-embedded three-way channel as described in claim 1, characterized in that, The cross-section of the bottom slot (14) is rectangular.

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