CN212695651U - Cable trough - Google Patents

Abstract

The utility model provides a cable duct relates to the railway engineering field. This cable duct includes: the cable-laying device comprises a groove-shaped structure and a cable-laying device, wherein a containing groove for laying a cable and a first drainage hole for communicating the bottom of the containing groove with the outside of one side of the groove-shaped structure are formed; the transition structure is connected with the groove-shaped structure and is positioned at the lower part of the groove-shaped structure, and second water drainage holes penetrating through two sides of the transition structure are formed in the transition structure; the reverse filtering drainage structure is connected to the lower part of the transition structure; and the inverted filter layers are at least arranged on two sides of the transition structure so as to cover two ends of the second water drainage hole. The utility model discloses a with groove-shaped structure, transition structure and anti-drainage structures integration prefabrication, improve the wholeness of cable duct, realized the simple and convenient of cable duct work progress, improve the efficiency of construction.

Description

Cable trough

Technical Field

The utility model relates to a railway engineering technical field especially relates to a cable duct.

Background

Railroad bed cable troughs are typically provided on the shoulders for the placement of numerous power, communication, signal, etc. cables. At present, the common method is that after roadbed filling is completed, a cable trough space is cut on the surface layer of a roadbed bed, a middle coarse sand-sandwiched composite geomembrane waterproof layer is laid at the bottom of the cut space, a cleaned broken stone drainage layer is laid on the middle coarse sand-sandwiched composite geomembrane waterproof layer, then a non-woven fabric wrapped seepage drainage gauze pad reverse filter layer is arranged on the two sides of the middle coarse sand layer and the broken stone drainage layer, a cable trough body is arranged on the upper portion of the broken stone drainage layer, meanwhile, a gap between one side, close to a track, of the cable trough body and the surface of the roadbed bed is filled with concrete not lower than C15, and a PVC drainage pipe is longitudinally arranged on the side wall, close to the side of a road shoulder. The traditional cable duct construction processes are numerous, interfaces between the processes are complex, the phenomenon of neglected loading and misloading is easy to occur, and the construction space is narrow and small, so that manual operation is mainly used, and a large amount of manpower and time are consumed.

Disclosure of Invention

In view of this, the utility model provides a main aim at provides a cable duct to solve the problem that the process is complicated in the cable duct work progress, and the efficiency of construction is low.

In order to solve the technical problem, the embodiment of the utility model provides a cable duct, the cable duct includes: the cable-laying device comprises a groove-shaped structure and a cable-laying device, wherein a containing groove for laying a cable and a first drainage hole for communicating the bottom of the containing groove with the outside of one side of the groove-shaped structure are formed; the transition structure is connected with the groove-shaped structure and is positioned at the lower part of the groove-shaped structure, and second water drainage holes penetrating through two sides of the transition structure are formed in the transition structure; the reverse filtering drainage structure is connected to the lower part of the transition structure; and the inverted filter layers are at least arranged on two sides of the transition structure so as to cover two ends of the second water drainage hole.

Further, the bottom of the accommodating groove forms an inclined drainage slope, and the first drainage holes are arranged along the inclined direction of the drainage slope.

Further, the plurality of first drainage holes are arranged at intervals along the length direction of the groove-like structure.

Further, the cable trough body also comprises a closed net arranged at the end part of one side of the trough-shaped structure, wherein the first drainage hole is positioned.

Further, the second water drainage holes are multiple, and one ends of the second water drainage holes are higher than the other ends of the second water drainage holes and are obliquely arranged.

Further, the reverse filtering drainage structure is an integral composite reverse filtering layer.

Further, the groove-shaped structure comprises a side plate and a groove body formed with the accommodating groove, the transition structure comprises a first transition layer and a second transition layer, and the reverse filtering drainage structure comprises a first reverse filtering drainage layer and a second reverse filtering drainage layer;

the side plate and the first transition layer are prefabricated integrally, the first anti-filtration drainage layer is connected to the lower part of the first transition layer, and the side plate, the first transition layer and the first anti-filtration drainage layer are connected into an integrated outer wall structure;

the tank body and the second transition layer are prefabricated integrally, the second reverse filtering drainage layer is connected to the lower portion of the second transition layer, and the tank body, the second transition layer and the second reverse filtering drainage layer are connected into an integral intermediate structure;

the two outer wall structures are detachably connected to two sides of at least one middle structure respectively;

the first water drainage hole is communicated with the groove body of the middle structure to the outside of the side plate of the outer wall structure on one side;

the second weep holes extend through the first transition layer and the second transition layer.

Further, the number of the intermediate structures is at least two, and two adjacent intermediate structures are detachably connected.

Further, the outer wall structure and the intermediate structure, as well as the two adjacent intermediate structures, are detachably connected through a tooth socket structure.

Further, the spline structure comprises a first spline and a second spline which are matched with each other, one of the first spline and the second spline is formed on the outer wall structure, and the other of the first spline and the second spline is formed on one side of the corresponding outer wall structure of the intermediate structure;

or the first tooth groove and the second tooth groove are respectively formed on two sides of the middle structure, and the outer wall structure is provided with the first tooth groove or the second tooth groove matched with the middle structure on the corresponding side.

The embodiment of the utility model provides a pair of cable duct, including groove-shaped structure, transition structure, anti drainage structures and anti-filter layer of straining, wherein, through prefabricated groove-shaped structure, transition structure and anti drainage structures integration of straining, connect the anti-filter layer again transition structure's both sides have increased the wholeness of cable duct for the cable duct work progress is simple and convenient, save time.

Drawings

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

Fig. 1 is a schematic view of an installation structure of a cable tray according to an embodiment of the present application;

FIG. 2 is a left side view of the cable trough of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is a schematic view of a cable trough assembly according to an embodiment of the present application;

FIG. 5 is a schematic cross-sectional view taken in the direction B-B of FIG. 4, showing the shoulder pad; and

FIG. 6 is an exploded view of FIG. 5;

description of the reference numerals

1-groove-shaped structure, 2-transition structure, 3-reverse filtering drainage structure, 4-reverse filtering layer, 5-closed net, 6-outer wall structure, 7-middle structure, 8-tooth groove structure, 9-shoulder pad, 1 a-side plate, 1 b-groove body, 11-holding groove, 111-drainage slope, 12-first drainage hole, 21-second drainage hole, 31-permeable layer, 32-drainage layer, 33-water-resisting layer, 2 a-first transition layer, 2 b-second transition layer, 3 a-first reverse filtering drainage layer, 3 b-second reverse filtering drainage layer, 81-first tooth groove, 82-second tooth groove, 91-shoulder pad first drainage hole, 92-shoulder pad second drainage hole and 10-cover plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The individual features described in the embodiments can be combined in any suitable manner without departing from the scope, for example different embodiments and aspects can be formed by combining different features. In order to avoid unnecessary repetition, various possible combinations of the individual specific features of the present application will not be described further.

In the description of the present application, it should be noted that, unless otherwise specified and limited, the term "connected" should be interpreted broadly, either directly or indirectly through an intermediate medium, and those skilled in the art can understand the specific meaning of the above terms according to specific situations.

In the following description, references to the terms "first \ second" are only to distinguish between similar objects and do not denote a particular ordering for the objects. It should be understood that the references to "above" and "below" are to be interpreted as referring to the orientation during normal use. The longitudinal direction of the groove-like structure refers to the direction from one end of the groove-like structure to the corresponding other end, i.e. in the direction of laying of the cable in the receiving groove.

It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The cable trough that this application embodiment provided, it can be used to railway engineering, also can be used to the accomodating and the protection of circuit among other power electrical equipment such as electric wire netting, communication engineering. It should be noted that the application scenario type of the present application is not limited to the present application.

The following description is taken as an example in connection with fig. 1 to the cable duct of this application embodiment for railway engineering, and the cable duct is located shoulder pad 9 and is close to railway rails one side, the holding tank 11 of cable duct is used for placing the cable, and first outlet 12 on the groove-shaped structure 1 links to each other with the first outlet 91 of shoulder pad 9, discharges the ponding in the holding tank 11 from shoulder pad side, and second outlet 21 discharges the ponding water conservancy diversion of railway rails one side to shoulder pad second outlet 92, holding tank 11 is established to the apron 10 on cable duct upper portion for the lid to protect cable duct upper portion.

In the embodiment of the application, as shown in fig. 1, the cable duct includes groove-shaped structure 1, transition structure 2, anti-drainage structure 3 and anti-filter layer 4, and groove-shaped structure 1, transition structure 2, anti-drainage structure 3 and anti-filter layer 4 form overall structure, are convenient for integral hoisting installation cable duct.

The groove-shaped structure 1 is provided with an accommodating groove 11 for laying a cable and a first drainage hole 12 for communicating the bottom of the accommodating groove 11 with the outside of the groove-shaped structure 1. Specifically, the cross section of the groove-shaped structure 1 is in a U shape or a plurality of U shapes arranged side by side, and the length, the height and the width of the groove-shaped structure 1 can be determined according to the actual engineering requirements. One side of the first drainage hole 12 is connected with the accommodating groove 11, and the other side is connected with one side of the outside of the groove-shaped structure 1. The first drainage hole 12 may be formed by presetting PVC pipe in the cable duct prefabrication process, and the diameter of the first drainage hole 12 may be 0.05 m.

The transition structure 2 is connected with the groove-shaped structure 1 and is positioned at the lower part of the groove-shaped structure 1, and second drainage holes 21 penetrating through two sides of the transition structure 2 are formed on the transition structure 2. Specifically, the transition structure 2 and the groove-shaped structure 1 are integrally prefabricated and constructed by reinforced concrete. The second bleed openings 21 are arranged with one port on one side of the transition structure 2 and the other port on the other side of the transition structure 2, the entire second bleed openings 21 extending axially through both sides of the transition structure 2. The second drainage hole 21 may be implemented by burying a PVC pipe in advance in a prefabrication process, and the diameter of the second drainage hole 21 may be 0.01 m.

The reverse filtering and draining structure 3 is connected to the lower part of the transition structure 2. The reverse filtering drainage structure 3 comprises a reverse filtering material and a drainage material, impurities such as silt and the like are prevented from entering the reverse filtering drainage structure 3 through the reverse filtering material and the drainage material, and meanwhile, water in the reverse filtering drainage structure 3 can be rapidly discharged.

The inverted filter layer 4 is disposed at least at both sides of the transition structure 2 to cover both ends of the second drainage hole 21. Specifically, the reverse filter layer 4 is made of geotextile, has the main function of drainage reverse filtering, and can be made of non-woven geotextile, woven geotextile or composite geotextile. The inverted filter layer 4 can be bonded or otherwise attached to both sides of the transition structure 2 and covers the transition structure 2 at the location of the second weep hole 21. The inverted filter layer 4 may cover both sides of the transition structure 2 parallel to the cross section of the second drainage hole 21, or may cover the peripheral side of the transition structure 2.

In this application embodiment, the cable duct includes groove-shaped structure, transition structure, drainage structures and anti-filter layer are strained to the anti-, through with groove-shaped structure, transition structure and anti-drainage structures integration prefabrication, set up the both sides at transition structure with anti-filter layer again for the cable duct forms overall structure, and the work progress is simple and convenient, and save time adopts the mill to prefabricate simultaneously and can monitor and record each process of production process, can the effective control cable duct quality, realizes traceing back of single cable duct.

In some embodiments of the present application, as shown in fig. 1, the bottom of the accommodating groove 11 forms an inclined drainage slope 111, and the first drainage hole 12 is arranged in an inclined direction of the drainage slope 111. Specifically, the drainage slope 111 forms a set angle with the horizontal plane, and the tangent value of the set angle, that is, the slope, is not less than 2%. The first drainage hole 12 communicates with the lower side of the drainage slope 111, and the axis of the first drainage hole 12 forms a set angle with the horizontal plane, and the tangent value, i.e., the slope, of the set angle is preferably 4%, and may be reduced according to the actual topography.

In the embodiment of this application, through form the drainage slope at the holding tank bottom to follow first outlet is arranged the drainage slope incline direction for ponding in the holding tank is more easily discharged outside the cable duct.

In some embodiments of the present application, as shown in fig. 2, a plurality of first bleed openings 12 are provided at intervals along the length of the channel-like structure 1. Specifically, the number of the first drainage holes 12 can be determined according to different length values of the trough-shaped structure 1, and the length of the single-section trough-shaped structure 1 can be 1m or 0.5 m.

In the embodiment of this application, through set up a plurality of first outlet openings at the interval in the length direction of cell-shaped structure for ponding in the holding tank discharges outside the cable trough more fast.

In some embodiments of the present application, as shown in fig. 2, the cable trough further comprises a closing screen 5 disposed at one side end of the first drainage opening 12 of the trough-like structure 1. Specifically, the closed net 5 may be a net structure formed by hot-dip galvanized iron wires arranged in a criss-cross manner, the closed net 5 needs to cover at least the first drainage hole 12, the closed net 5 may be square, circular or in other shapes, and the closed net 5 may be pre-arranged in the groove-shaped structure 1 or may be connected to a side surface of the groove-shaped structure 1 close to the shoulder pad 9.

In the embodiment of the application, the closed net is arranged at the end part of the first drainage hole, which is positioned on one side of the groove-shaped structure, so that the cable placed in the cable trough can be protected, and a small animal such as a snake mouse is prevented from entering the cable trough to damage the cable.

In some embodiments of the present application, as shown in fig. 1 and 2, the second drain opening 21 is plural, and one end of the plural second drain openings 21 is higher than the other end, for example, arranged obliquely in a direction parallel to the first drain opening 12. Specifically, a plurality of second weep holes 21 are uniformly distributed in rows inside the transition structure 2, the plurality of rows of second weep holes 21 may be arranged in an aligned manner or in a staggered manner, and one end of the second weep hole 21 far away from the shoulder pad 9 is higher than one end of the second weep hole close to the shoulder pad 9.

In the embodiment of this application, through set up a plurality of second outlet openings in transition structure and arrange the second outlet opening slope for the water that shoulder pad one side was kept away from to the cable duct can be better arrange extremely via the cable duct shoulder pad second outlet opening, thereby reaches the protection to the cable.

In some embodiments of the present application, as shown in fig. 3, the reverse drainage structure 3 is a monolithic composite reverse filter layer. Specifically, for example, the PPF monolithic composite reverse filter layer is used. The PFF is a short for template function (stress form work Feature), and the PFF integral composite reverse filter layer includes a permeable layer 31, a drainage layer 32, and a water-resisting layer 33. The permeable layer 31 can be made of one or a mixture of natural fiber, chemical fiber non-woven fabric and woven fabric, which can effectively prevent fine particles from losing, and can rapidly permeate water without clogging for a long time. The drainage layer 32 is a three-dimensional net material with large porosity and certain strength, which is a three-dimensional net structure formed by spinning thermoplastic synthetic resin as a main raw material, rotating the filaments under the condition that the filaments are not solidified and bonding multiple points of the filaments with each other, and has the characteristics of small water flow resistance, no adhesion of silt, organisms and the like, strong cross-section water permeability and the like. The water-proof layer 33 is a flexible or semi-rigid thin-layer water-proof material with certain toughness and strength, and may be one of a PE film, a PP film, a PVC film, a wood wool board, a plastic board, or a waterproof cloth. The water barrier layer 33, the water permeable layer 32 and the drainage layer 31 are integrally formed by hot melt adhesion, gluing or sewing.

In the embodiment of this application, the drainage structure is strained to the contrary adopts integral compound reverse filter layer, when keeping the drainage back filter advantage of tradition infiltration, has improved the permeability and the transition performance of material, but improves drainage structure's wholeness of straining conversely, and simple structure, easily construction.

In some embodiments of the present application, as shown in fig. 5, the gutter-like structure 1 includes a side plate 1a and a groove body 1b formed with a receiving groove 11, the transition structure 2 includes a first transition layer 2a and a second transition layer 2b, and the anti-filtration drainage structure 3 includes a first anti-filtration drainage layer 3a and a second anti-filtration drainage layer 3 b. Specifically, the second drainage holes 21 are distributed in the first transition layer 2a and the second transition layer 2b, and the first reverse-filtration drainage layer 3a and the second reverse-filtration drainage layer 3b both include a reverse-filtration material and a drainage material, for example, both are PFF monolithic composite reverse-filtration layers.

As shown in fig. 6, the side plate 1a and the first transition layer 2a are prefabricated integrally, the first anti-filtering drainage layer 3a is connected to the lower part of the first transition layer 2a, and the side plate 1a, the first transition layer 2a and the first anti-filtering drainage layer 3a are connected to form an outer wall structure 6 integrally.

The groove body 1b and the second transition structure 2b are integrally prefabricated, the second reverse filtering and draining layer 3b is connected to the lower portion of the second transition layer 2b, and the groove body 1b, the second transition layer 2b and the second reverse filtering and draining layer 3b are connected into an integral middle structure 7.

The two outer wall structures 6 are detachably connected to both sides of at least one intermediate structure 7 respectively; the first water drainage hole 12 is communicated with the groove body 1b of the middle structure 7 to the outside of the side plate 1a of the outer wall structure 6 at one side; the second drain holes 21 penetrate the first transition layer 2a and the second transition layer 2 b.

In the embodiment of this application, when the cable duct needs a plurality of intermediate structures to constitute, set up outer wall structure and make two sides of cable duct level and smooth and intensity increase, assemble the convenient cable duct transportation of structure simultaneously.

In some embodiments of the present application, as shown in fig. 6, there are at least two intermediate structures 7, and two adjacent intermediate structures 7 are detachably connected. Specifically, the quantity of intermediate structure 7 can set up a plurality ofly according to actual need, need guarantee the holding tank 11 that first outlet 12 intercommunication cell body 1b formed in the connection of a plurality of intermediate structure 7, and the length and the height of a plurality of intermediate structure 7 should keep unanimous, and the width of a plurality of intermediate structure 7 can be different.

In the embodiment of this application, a plurality of intermediate structure detachably connect, because certain special reason can not place the condition at an holding tank to the cable that several kinds of functions are different, and optional situation needs to set up a plurality of intermediate structure and realizes that multiple function cable lays simultaneously.

In some embodiments of the present application, the outer wall structure 6 is removably connected to the intermediate structure 7, and to two adjacent intermediate structures 7 by spline structures 8, as shown in figure 4. Specifically, the teeth or grooves of the tooth socket structure 8 may be rectangular or trapezoidal, the depth and number of the teeth or grooves may be varied according to the design, and the outer wall structure 6 and the intermediate structure 7 may be provided with tooth socket structures 8 having one or more tooth or groove shapes.

In the embodiment of the application, the outer wall structure, the middle structure and two adjacent middle structures are connected through the tooth socket structure, so that flexible combination and convenient assembly and disassembly are realized.

In some embodiments of the present application, as shown in fig. 4, the spline structure 8 includes a first spline 81 and a second spline 82 fitted to each other, one of the first spline 81 and the second spline 82 is formed on the outer wall structure 6, and the other of the first spline 81 and the second spline 82 is formed on the side of the intermediate structure 7 located on the corresponding outer wall structure 6. For example, the outer wall structures 6 on both sides are formed with first tooth grooves 81 or second tooth grooves 82, and when the number of the middle structures 7 is 1, the middle structures 7 on both sides are formed with first tooth grooves 81 or second tooth grooves 82; when the number of the intermediate structures 7 is greater than 1, the intermediate structures 7 may form the first tooth grooves 81 or the second tooth grooves 82 on both sides, or form the first tooth grooves 81 on one side and form the second tooth grooves 82 on the other side.

In the embodiment of the application, the first tooth groove and the second tooth groove which are mutually meshed are respectively arranged on the middle structure and the outer wall structure, so that the middle structure is assembled and connected with the outer wall structure when the two outer wall structures simultaneously form the first tooth groove or the second tooth groove.

In some embodiments of the present application, the first tooth slot 81 and the second tooth slot 82 are respectively formed on both sides of the intermediate structure 7, and the outer wall structure 6 is formed with the first tooth slot 81 or the second tooth slot 82 adapted to the corresponding side intermediate structure 7. For example, a first tooth slot 81 is formed on the outer wall structure 6 on one side, and a second tooth slot 82 is formed on the outer wall structure 6 on the other side.

In the embodiment of the application, the first tooth groove and the second tooth groove are respectively arranged on the two sides of the middle structure, the first rack or the second rack matched with the middle structure on the corresponding side is arranged on the outer wall structure, the tooth-shaped structures on the two sides of the middle structures are the same, and the universality of the middle structure die can be improved.

The embodiment of the application also provides a construction method of the cable trough, which is applied to railway engineering for example and comprises the following steps:

s1, wholly filling a space for laying a cable trough on the surface layer of the roadbed bed;

s2, laying a medium coarse sand leveling layer at the bottom of the cable trough space, wherein the medium coarse sand leveling layer is 4 cm;

s3, integrally hoisting the cable trough of any one of the above embodiments, and placing one side of the cable trough, which is provided with the first drainage hole 12, on one side close to the shoulder protector 9;

s4, hoisting the cable troughs longitudinally and sequentially along the line;

s5, building a shoulder pad 9 pouring formwork, placing a pipe fitting of a shoulder pad first drainage hole 91 at a position corresponding to a cable duct first drainage hole 12, placing a pipe fitting of a shoulder pad second drainage hole 92 at a position of a reverse filtering drainage structure 3 and a second drainage hole 21 positioned at the lowest part, fixing the pipe fitting and the formwork together, and pouring concrete to form the shoulder pad 9;

and S6, filling concrete, for example, the grade of concrete is not lower than C25, in the gap between the side, close to the track, of the cable trough and the surface layer of the roadbed.

In the embodiment of this application, through forming the cable duct space on the roadbed bed, for example cut out the cable duct space after roadbed bed whole filling is accomplished, coarse sand screed-coat in laying, a plurality of cable ducts of line hoist and mount along the line, arrange the first outlet opening of shoulder pad and shoulder pad second outlet opening, available diameter is the first outlet opening of shoulder pad and shoulder pad second outlet opening as the PVC pipe of 80mm for example, pour and form the shoulder pad, the integral erection of cable duct has been realized, the work progress is simple and convenient, and the time is saved.

The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application.

Claims (10)

1. A cable tray, comprising:

the cable-laying device comprises a groove-shaped structure and a cable-laying device, wherein a containing groove for laying a cable and a first drainage hole for communicating the bottom of the containing groove with the outside of one side of the groove-shaped structure are formed;

the transition structure is connected with the groove-shaped structure and is positioned at the lower part of the groove-shaped structure, and second water drainage holes penetrating through two sides of the transition structure are formed in the transition structure;

the reverse filtering drainage structure is connected to the lower part of the transition structure; and

and the inverted filter layers are at least arranged on two sides of the transition structure so as to cover two ends of the second water drainage hole.

2. The cable trough according to claim 1, wherein the bottom of the accommodating groove forms an inclined drainage slope, and the first drain hole is arranged in an inclined direction of the drainage slope.

3. The cable trough according to claim 1, wherein a plurality of said first weep holes are spaced along the length of said trough-like structure.

4. The cable trough of claim 1 further comprising a closing screen disposed at one side end of said first bleed opening on said trough-like structure.

5. The cable trough of claim 1, wherein said second plurality of weep holes are a plurality of said second plurality of weep holes having one end higher than the other end.

6. The cable trough of claim 1, wherein the drainage and drainage structure is a monolithic composite inverted filter.

7. The cable trough according to any one of claims 1 to 6, wherein the trough-shaped structure comprises side plates and a trough body formed with the accommodating trough, the transition structure comprises a first transition layer and a second transition layer, and the anti-filtering drainage structure comprises a first anti-filtering drainage layer and a second anti-filtering drainage layer;

the side plate and the first transition layer are prefabricated integrally, the first anti-filtration drainage layer is connected to the lower part of the first transition layer, and the side plate, the first transition layer and the first anti-filtration drainage layer are connected into an integrated outer wall structure;

the tank body and the second transition layer are prefabricated integrally, the second reverse filtering drainage layer is connected to the lower portion of the second transition layer, and the tank body, the second transition layer and the second reverse filtering drainage layer are connected into an integral intermediate structure;

the two outer wall structures are detachably connected to two sides of at least one middle structure respectively;

the first water drainage hole is communicated with the groove body of the middle structure to the outside of the side plate of the outer wall structure on one side;

the second weep holes extend through the first transition layer and the second transition layer.

8. The cable trough of claim 7, wherein there are at least two of the intermediate structures, and adjacent two of the intermediate structures are removably connected.

9. The cable trough of claim 7 wherein said outer wall structure is removably connected to said intermediate structure and to adjacent ones of said intermediate structures by spline structures.

10. The cable trough of claim 9, wherein the spline structure comprises first and second mutually mating splines; one of the first tooth slot and the second tooth slot is formed on the outer wall structure, and the other of the first tooth slot and the second tooth slot is formed on one side of the intermediate structure corresponding to the outer wall structure;

or the first tooth groove and the second tooth groove are respectively formed on two sides of the middle structure, and the outer wall structure is provided with the first tooth groove or the second tooth groove matched with the middle structure on the corresponding side.

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