JPH0329959Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is used when various cables such as telephone lines, power lines, optical fibers, and related incidental equipment are consolidated and buried underground. It is related to the cab system.

[Prior Art] Recently, research and development of cab systems for consolidating and accommodating cables such as telephone lines and power lines in a relatively narrow underground space has been promoted. This type of cab system consists of a groove-shaped cab body consisting of a plurality of troughs arranged at the top with an opening, and a cap with the top end located on the ground surface. A device has been developed that includes a lid covered with a cloth, and the upper surface of the lid can be used as a walkway or the like.

[Problems to be Solved by the Invention] However, the conventional lid body is simply a structure in which rectangular plate-shaped lid blocks are arranged butt against each other on the opening end surface of the cab body. Therefore, when an unexpected external force is applied to the lid block, or when unreasonable internal pressure is applied due to a cable short circuit inside the cab body, the lid blocks tend to lift up and become misaligned with each other. .
As a result, there is a problem in that a gap is generated at the joint portion of the lid block, making it easy for rainwater etc. to flow into the lid block.

The present invention aims to reliably solve such problems.

[Means for Solving the Problems] In order to achieve the above objects, the present invention employs the following configuration.

That is, the cab system according to the present invention includes a groove-shaped cab body formed by arranging a plurality of troughs each having an open top surface, and a lid attached to the top opening of the cab body with the top end located on the ground surface. The lid includes a first lid block formed with both joint end faces facing diagonally upward, and a first lid block formed with both joint end faces facing diagonally downward. 2 lid blocks are arranged alternately with their joining end surfaces abutted against each other, and an insert nut is buried in a portion of the cab body corresponding to the second lid block, and the insert nut is inserted into the cab body. The present invention is characterized in that the second lid block is tightened to the cab body with a screwed bolt so that the joint surfaces of the lid blocks can be brought into close contact with each other.

[Function] With this configuration, the second lid block is tightened and fixed to the cab body by the tightening force of the bolt. In the process of tightening, the downward joint surface of the second lid block is pressed against the upper joint surface of the adjacent first lid block by a wedge action and comes into close contact with the upper joint surface of the adjacent first lid block. Therefore, the lid blocks are reliably joined together, and the first lid block is also firmly fixed onto the cab body.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in Figures 1 to 3, this cab system consists of a cab body 1 buried near the ground surface.
, and this cab body 1 with its upper end exposed on the ground surface.
The lid body 2 is mounted on the upper end opening of the lid body 2.

Cab body 1 does not show multiple troughs 3
It is a groove-shaped type connected by appropriate connecting means such as prestressing steel or connecting fittings. The trough 3 is made of precast and has a reinforced concrete structure, with a bottom plate 4 and both side walls 5 integrally molded, and the side walls 5 have a cable outlet (not shown) and a shelf for installing the cable 6. 7th grade is provided. Then, the opening end surface 1 of this cab body 1
A cutout step portion 1b is formed on the outer edge side of a.

On the other hand, the lid body 2 has a plate-like shape having protrusions 2a on both edges of the lower surface that engage with the notched step portions 1b of the cab body 1, and has a first lid block 8 and a second lid block 9. and are arranged alternately. The first lid block 8 is a plate-shaped precast block having a reinforced concrete structure, and both joint end faces 8a thereof are formed diagonally upward.
The second lid block 9 is a plate-shaped block made of precast and has a reinforced concrete structure, and its joint end surface 9a is formed diagonally downward. By arranging the first lid block 8 and the second lid block 9 alternately,
The joint end surface 8a and the joint end surface 9a are brought into contact with each other.

Further, bolt holes 11 are provided in the vicinity of the side edges of the second lid block 9, and insert nuts 12 are provided in the open end portion of the cab body 1 at the portions corresponding to the respective bolt holes 11.
are buried in each. Each of the second lid blocks 9 is tightly joined to the cab body 1 by screwing the bolts 13 inserted into the bolt holes 11 into the corresponding insert nuts 12 and tightening them. In addition, the head 13 of the bolt 13
As shown in FIGS. 4 and 5, a + (or -) shaped engagement groove 13b for engaging a tightening tool is carved in the bolt hole 11.
The diameter of the seat 11a is set to the minimum value. A washer 14 and a waterproof packing 15 are interposed between the head 13a of the bolt 13 and the seat 11a of the bolt hole 11. Furthermore, between the lower surfaces of both side edges of each of the lid blocks 8 and 9 and the opening end surface 1a of the cab body 1, and between the joint end surfaces 8a and 9a of each of the lid blocks 8 and 9,
Water-stopping rubber (not shown) is interposed in each case.

With such a structure, when the bolt 13 inserted into the bolt hole 11 of the second lid block 9 is screwed into the corresponding insert nut 12 and tightened, the second lid block is tightened by the tightening force. 9
is tightened and fixed to the cab body 1 via water stop rubber. In the process of tightening, the downward joint surface 9a of the second lid block 9 is pressed against the upper joint surface 8a of the adjacent first lid block 8 via the water stopper rubber due to the wedge action, and is tightly attached. I will do it. Therefore, the lid blocks 8 and 9 are reliably joined together, and the first lid block 8 is also firmly fixed onto the cab body 1 via the waterproof rubber. Therefore, even if an unexpected external force is applied to each lid block 8, 9, or an unreasonable internal pressure is applied due to a cable short circuit inside the cab body 1, the lid will not be displaced due to lifting or the like. Therefore, the joint between the lid blocks 8 and 9 and the connection between each lid block 8 and 9 and the cab body 1
It is possible to reliably seal off water at the joint portion with the water, and maintain the water-stopping effect over a long period of time.

Note that the shapes of the cab body and lid are not limited to the embodiments described above, and may be, for example, as shown in FIG. 6. That is, the cab body 101 of this cab system is
A cutout step 101 is formed on the inner edge side of the opening end surface 101a.
It has b. Therefore, the first lid block 108 and the second lid block 109 constituting the lid body 102 have a shape that does not have any protrusions or the like on both side edges. and each second lid block 10
Bolt holes 111 are provided on both side edges of the cab body 1 corresponding to the bolt holes 111.
An insert nut 112 is embedded in the end face portion of the notch step portion 101b of 01, and the bolt hole 11 is inserted into the bolt hole 11.
By screwing the bolt 113 inserted into the insert nut 112 into the insert nut 112 and tightening it,
The second lid block 109 is tightly connected to the cab body 101. Therefore, in this embodiment as well, in the process of tightening the second lid block 109 to the cab body 101, the downward joint end surface 109a of the second lid block 109 touches the top of the adjacent first lid block 108. Facing joint end face 10
8a, and the first lid block 108 is also firmly fixed to the cab body 101.

Furthermore, the bolts for tightening the second lid block to the cab body are not limited to those of the above embodiments. For example, if the lid block has sufficient strength, its head A normal one having a hexagonal prism may also be used. moreover,
Various modifications can be made to the material, such as using stainless steel, ceramic, or brass for bolts and insert nuts. However, if bolts made of a material that does not rust are used, for example, as shown in Figs.
As shown in the figure, the top surface of the head 213a of the bolt 213 and the top surface of the lid block 9 are set to be substantially flush with each other,
It is also possible to make the seat 11a small in diameter.

Further, the form of the engaging portion for engaging the tool with the head of the bolt is not limited to that of the embodiment described above, and may be of the form shown in FIG. 9, for example. That is, the bolt shown in FIG. 9 has a head 313a of a bolt 313 having a shape similar to that shown in FIGS. 7 and 8, with a pair of recessed holes 313b formed therein. The bolt 313 is attached and detached using a U-shaped tool having a protrusion that engages with the recessed hole 313b.

Further, the structure of the upper end portion of the bolt hole provided in the lid block is not limited to that of the above embodiment, and for example,
It may be as shown in FIGS. 10 and 11. That is, this one is the lid block 9
A cup 416 with a hole and a bottom made of ceramic, stainless steel, brass, etc. is buried in the upper surface, and the head 413a of the bolt 413 inserted into the bolt hole 411 is locked by this cup 416. A seat 411a is formed for the purpose. A female threaded portion 416a is formed on the inner periphery of the open end of this cup 416, and a lid 417 is screwed onto this female threaded portion 416a. The lid body 417 is made of ceramic, stainless steel, brass, etc., and has a cap shape with a threaded portion 417a on the outer periphery, and has a cross shape on the outer surface for engaging an opening/closing tool. An engagement groove 417b is carved. Modified examples of the lid include those shown in FIG. 12 or 13, for example. That is, the first
The lid 517 shown in FIG. 2 has a threaded portion 517a on its outer periphery and a pair of engagement holes 517b on the outer surface for engaging an opening/closing tool, and is similar to the lid 517 shown in FIG. Reference numeral 617 has a threaded portion 617a on the outer periphery and a prismatic engagement protrusion 617b on the outer surface for engaging an opening/closing tool.

Further, a concave-convex engaging portion may be provided between the trough and each lid block to enable horizontal positioning of the lid block.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a partially cutaway side view, FIG. 2 is a cross-sectional view taken along the - line in FIG. 4
The figure is a partial cross-sectional view showing a bolt fastening part, and FIG. 5 is a plan view of the same. FIG. 6 is an exploded perspective view showing another embodiment. FIG. 7 is a partial sectional view corresponding to FIG. 4 showing another embodiment of the present invention, and FIG. 8 is a plan view thereof. FIG. 9 is a plan view of a bolt fastening portion showing still another embodiment of the present invention. FIG. 10 is a partial sectional view of a bolt fastening portion showing still another embodiment of the present invention, and FIG. 11 is an exploded perspective view of the same portion. FIGS. 12 and 13 are perspective views showing still other embodiments. 1... Cab body, 1a... Opening end surface, 1b...
...Notch step, 2... Lid, 2a... Projection, 3...
Trough, 4... Bottom plate, 5... Side wall, 6... Cable, 7... Shelf, 8... First lid block, 8a...
...Joining end surface, 9...Second lid block, 9a...
Joint end surface, 11... Bolt hole, 11a... Seat, 1
2...Insert nut, 13...Bolt, 13
a... Head, 13b... Engagement groove, 14... Washer, 15... Water stop packing, 101... Cab body, 101a... Opening end surface, 101b...
Notch step, 102... Lid body, 108... First lid block, 108a... Joint end surface, 109... Second lid block, 109a... Joint end surface, 111
...Bolt hole, 112 ...Insert nut, 1
13...Bolt, 213...Bolt, 213a...
...Head, 313...Bolt, 313a...Head,
313b... Recessed hole, 411... Bolt hole, 41
1a...Seat, 413...Bolt, 413a...Head, 416...Cup, 416a...Female thread part,
417...Lid body, 417a...Male thread part, 417
b...Engagement groove, 517...Lid body, 517a...Male thread portion, 517b...Engagement hole, 617...Lid body,
617a...male thread part, 617b...engaging protrusion.

Claims (1)

[Scope of utility model registration request] A cab body comprising a groove-shaped cab body formed by arranging a plurality of troughs each having an open top surface, and a lid body whose top end is located on the ground surface and which is attached to the top opening of the cab body. It is a Yabu system,
The lid body alternately includes a first lid block formed with both joint end faces facing diagonally upward, and a second lid block formed with both joint end faces facing diagonally downward, with the joint end faces butted against each other. At the same time, an insert nut is embedded in a portion of the cab body corresponding to the second lid block, and a bolt screwed into the insert nut is used to attach the second lid block to the cab body. A cab system characterized by being constructed so that the joining surfaces of each lid block can be brought into close contact with each other by tightening.