Detachable crawling ladder type cable tunnel / working well

Abstract

A detachable crawling ladder type cable tunnel / working well comprises a tunnel body, a bottom plate is arranged at the bottom of the tunnel body, a cushion layer is arranged below the bottom plate, a tunnel portal is formed in the top of the tunnel body and defined by symmetrically-arranged L-shaped top plates, and the peripheries of the L-shaped top plates are compacted by an overburden layer; a steel bar crawling ladder is arranged in a tunnel portal, a detachable crawling ladder is hung below the steel bar crawling ladder, the detachable crawling ladder comprises a crawling ladder body, an upper end hook is arranged at the top of the crawling ladder body, and the bottom of the crawling ladder body is fixedly connected with a bottom plate through an embedded part. The ladder stand is convenient for people to pass up and down, and the ladder stand can be placed in the same direction as the longitudinal direction of the tunnel (or the working well), so that a pedestrian path arranged in the ladder stand is not occupied, and the passing of the people in the ladder stand is not influenced.

Description

Technical Field

[0001] The utility model relates to an assembled and detachable ladder for cable tunnels and work pits, which is an improvement to conventional ladders for cable tunnels and work pits. Background Art

[0002] With the increasingly accelerated urbanization process and the large-scale increase in urban electricity consumption, the construction of underground power transmission line projects is increasing. As an important component of underground power transmission line channels, the importance of normal operation, inspection and maintenance of high-voltage cables is becoming increasingly prominent. The safety manhole is the "throat" connecting the ground and underground spaces, and it is an important part for people to enter and exit. However, when the cables in the cable tunnel or working shaft are arranged on both sides, the safety manhole is often set at the horizontal center of the structure, rather than next to the shaft wall (or tunnel side wall), so it is impossible to set up a conventional ladder for use, such as Figure 1 shown. Utility Model Content

[0003] The technical problem to be solved by the utility model is: how to solve the problems of the prior art and provide a cable tunnel / working shaft with a detachable ladder.

[0004] The technical solution of the utility model is specifically as follows:

[0005] A cable tunnel / working pit with a detachable ladder comprises a tunnel body, a bottom plate provided at the bottom of the tunnel body, a cushion layer provided below the bottom plate, a tunnel opening provided at the top of the tunnel body, the tunnel opening being surrounded by symmetrically arranged L-shaped top plates, the outer periphery of the L-shaped top plates being compacted by a covering soil layer;

[0006] A steel ladder is provided in the tunnel entrance, a detachable ladder is hung below the steel ladder, the detachable ladder comprises a ladder body, an upper end hook is provided on the top of the ladder body, and the bottom of the ladder body is fixedly connected to the base plate through embedded parts.

[0007] The ladder body includes two angle steels, which are connected by welding with threaded steel bars.

[0008] The length of the rebar is 488mm, the diameter is 22mm, and the distance between two adjacent rebars is 300mm.

[0009] One end of the upper hook is bent into a semicircular arc hook for hanging with a conventional steel ladder in the upper well cavity; the other end is welded to the upper end of the angle steel.

[0010] The upper hook is made of Q235B round steel with a diameter of 20mm, and one end is bent into a semicircular hook with a diameter of 35mm.

[0011] A triangular sealing plate is embedded in the bottom plate, an oblong hole is provided at the bottom of the angle steel, bolts are provided in the oblong hole, and the angle steel and the triangular sealing plate are fixedly connected by the bolts.

[0012] Cable supports are arranged on both sides of the detachable ladder, and the cable supports are arranged in the well cavity; the cable supports include a fixing plate fixed on the inner wall of the well cavity, and a plurality of bracket plates are arranged on the fixing plate.

[0013] The beneficial effects of the present invention are as follows: it has the following advantages: the present invention sets up an assembled and detachable ladder in the cable tunnel and working shaft, which not only facilitates the passage of personnel up and down, but also because the ladder can be placed in the same direction as the longitudinal direction of the tunnel (or working shaft), it does not occupy the pedestrian walkway provided therein, and does not affect the passage of personnel inside. At the same time, the ladder can also be removed during maintenance or replacement to avoid obstacles in the maintenance and replacement of high-voltage cables and equipment (drain pipes, air ducts and other facilities) inside. The ladder can also be reinstalled after equipment maintenance, which is of great significance for the operation, maintenance and inspection of high-voltage cables and other equipment in cable tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a ladder used in conventional cable tunnels and work wells;

[0015] Figure 2 This is a schematic diagram of the front layout of the utility model;

[0016] Figure 3 This is a schematic diagram of the side layout of the utility model;

[0017] Figure 4 This is a detailed drawing of the ladder connection components for cable tunnels and work pits of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0020] like Figure 1 As shown, a cable tunnel / working shaft with a detachable ladder type includes a tunnel body 1, a bottom plate 2 is arranged at the bottom of the tunnel body 1, a cushion layer 3 is arranged under the bottom plate 2, a tunnel opening 4 is arranged at the top of the tunnel body 1, and the tunnel opening 4 is surrounded by symmetrically arranged L-shaped top plates 5, and the outer periphery of the L-shaped top plate 5 is compacted by a covering soil layer 6.

[0021] A steel ladder 7 is provided in the tunnel entrance 4, and a detachable ladder 8 is hung below the steel ladder 7. The detachable ladder 8 includes a ladder body 81, and an upper end hook 82 is provided on the top of the ladder body 81. The bottom of the ladder body 81 is fixedly connected to the base plate 2 through embedded parts.

[0022] Furthermore, the ladder body 81 includes two angle steels 83. The angle steels 83 are made of two Q235L63*6 angle steels with the left and right tips placed opposite each other. The outer skin size is 500mm. The two angle steels 83 are welded together using threaded steel bars 84. The threaded steel bars 84 are 488mm long and 22mm in diameter. The distance between each two adjacent threaded steel bars is 300mm.

[0023] Furthermore, the upper end hook 82 is made of Q235B round steel with a diameter of 20 mm, and one end is bent into a semicircular arc hook with a diameter of 35 mm for hanging with the conventional steel ladder 7 in the upper well cavity; the other end is welded to the upper end of the angle steel 83, and the welding adopts double-sided fillet weld.

[0024] Furthermore, a triangular sealing plate 85 is pre-embedded in the base plate 2. An oblong hole 86 is provided at the bottom of the angle steel 83, and bolts are installed in the oblong hole 86. Thus, the angle steel 83 and the triangular sealing plate 85 are fixedly connected by M16 bolts. During construction, an oblong hole with a diameter of 17.5 and a diameter of 40 mm is drilled at the end of the angle steel in the tunnel or pit base plate, and fixed to the ladder body angle steel with M16 bolts. Furthermore, the triangular sealing plate pre-embedded in the base plate 2 prevents injuries to the ankles from the sharp corners of the angle steel.

[0025] It should be noted that all exposed components (including the bottom embedded angle steel, the ladder body, and the hooks welded on it) should be hot-dip galvanized.

[0026] Furthermore, cable brackets 9 are provided on both sides of the detachable ladder 8. The cable brackets 9 are provided in the well cavity. The cable brackets 9 include a fixing plate 91 fixed to the inner wall of the well cavity, and a plurality of bracket plates 92 are provided on the fixing plate 91. The bracket plates 92 are used to place cables.

[0027] The construction principle of this utility model is:

[0028] 1) If Figure 4 As shown, the steel ladder 7 is processed in advance in the factory and hot-dip galvanized;

[0029] 2) When constructing a cable tunnel or working pit, if Figure 1 As shown, the steel ladder 7 in the safety manhole cavity should be pre-buried;

[0030] 3) Similarly, if Figure 4 As shown, a triangular sealing plate 85 is pre-embedded in the bottom plate 2;

[0031] 4) If Figure 2 、 Figure 3 、 Figure 4 As shown, the detachable ladder 8 is hung on the steel ladder 7 in the well cavity, and then the lower end of the detachable ladder 8 is fastened to the pre-buried triangular sealing plate 85 using M16 bolts.

[0032] The new assembled and detachable ladder for cable tunnels and work pits not only facilitates the passage of personnel up and down, but also does not occupy the pedestrian walkways provided therein, thus not affecting the passage of personnel inside. At the same time, the ladder can also be removed for maintenance or replacement to avoid obstacles to the maintenance and replacement of high-voltage cables and equipment (drain pipes, air ducts, and other facilities) within. The ladder can also be reinstalled after equipment maintenance. It can also be prefabricated in the factory, meeting the needs of direct assembly and fastening from the factory to the site, greatly shortening the construction period and achieving good environmental and economic benefits. It can also avoid welding operations in confined spaces such as tunnel work pits, reducing the occurrence of safety hazards and having good social benefits.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the scope of protection of the present invention.

Claims

1. A cable tunnel / working pit with a detachable ladder, characterized by: The tunnel body (1) comprises a tunnel body (1), a bottom plate (2) is provided at the bottom of the tunnel body (1), a cushion layer (3) is provided below the bottom plate (2), a tunnel opening (4) is provided at the top of the tunnel body (1), the tunnel opening (4) is surrounded by symmetrically arranged L-shaped top plates (5), and the periphery of the L-shaped top plates (5) is compacted by a covering soil layer (6); A steel ladder (7) is provided in the tunnel entrance (4), a detachable ladder (8) is hung below the steel ladder (7), and the detachable ladder (8) includes a ladder body (81), an upper end hook (82) is provided on the top of the ladder body (81), and the bottom of the ladder body (81) is fixedly connected to the base plate (2) via an embedded part.

2. A cable tunnel / working pit with a detachable ladder according to claim 1, characterized in that: The ladder body (81) comprises two angle steels (83), and the two angle steels (83) are welded together using threaded steel (84).

3. The cable tunnel / working pit with a detachable ladder according to claim 2, characterized in that: The threaded steel bar (84) has a length of 488 mm and a diameter of 22 mm, and the distance between each two adjacent threaded steel bars is 300 mm.

4. The cable tunnel / working pit with a detachable ladder according to claim 1, characterized in that: One end of the upper hook (82) is bent into a semicircular arc hook for hooking with a conventional steel ladder (7) in the upper well cavity; the other end is welded to the upper end of the angle steel (83).

5. The cable tunnel / working pit with a detachable ladder according to claim 4, characterized in that: The upper end hook (82) adopts the Q235B round steel of diameter 20mm, and one end is bent into the semicircular arc hook of diameter 35mm.

6. The cable tunnel / working pit with a detachable ladder according to claim 2, characterized in that: A triangular sealing plate (85) is embedded in the bottom plate (2), an oblong hole (86) is provided at the bottom of the angle steel (83), a bolt is provided in the oblong hole (86), and the angle steel (83) and the triangular sealing plate (85) are fixedly connected by the bolts.

7. The cable tunnel / working pit with a detachable ladder according to claim 1, characterized in that: Cable supports (9) are provided on both sides of the detachable ladder (8), and the cable supports (9) are provided in the well cavity; the cable supports (9) include a fixing plate (91) fixed on the inner wall of the well cavity, and a plurality of support plates (92) are provided on the fixing plate (91).

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