JPS62152318A - Block type duct sleeve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for reducing the tension during cable insertion, accommodation space, etc. when installing a perforated pipe in a manhole, which is provided on a partition plate in a conduit and through which a plurality of cables are inserted. The present invention relates to a block-shaped duct sleeve suitable for a perforated pipe.

[Conventional technology]

The conventional device for connecting a snowy road and a manhole has a structure of 1 cable, 51 pipes, 1 duct sleeve 52, as shown in the structural diagram in Fig. 5, so the number of items per work load, etc. were economically disadvantageous.

In addition, a partition plate 6 is installed in the conduit shown in the structural explanatory diagram of Fig. 6, which has the advantage of improving economy and workability by consolidating the cross section.
If the perforated pipe 61 equipped with There are three points to mention: the structure allows the cable to be accommodated within the accommodation space.

[Problem that the invention seeks to solve]

It is difficult for conventional duct sleeves to satisfy the above-mentioned conditions for duct sleeves. The reason for this will be explained, for example, with respect to a simple duct sleeve for a porous pipe, the structure of which is shown in FIGS. 7A and 7H. 70 is a perforated pipe duct sleeve, 71 is a perforated pipe, 72 is a cross section of a perforated pipe, and 73 is a cross section of a duct opening. Several tools are available for each application category, such as installation, movement prevention, and fixation, as duct opening installation tools mentioned in ① of duct sleeve conditions, but there are factors that affect the application of current tools. , the duct axis spacing Ll and the duct opening insertion length L2 of the perforated pipe duct sleeve 70 shown in FIG. Regarding the former duct axis spacing Ll, for example, the B-type cable movement prevention fitting (material) of the movement prevention tool whose structure is shown in Fig. 8A and H,
It is necessary to take the current 15 am. Note that 81 is a cable, 82 is a manpole, and 83 is a duct opening.

Regarding the latter duct opening insertion length L2, it is necessary to have a metal bell mouth of 20 cm MR, for example, as shown in FIGS. 9A to 9C. Note that changing these values is not economical because it affects the application of various other tools. This limiting condition is the seventh
The gap H shown in the figure has a lower limit, but
When inserting a cable into this H gap,
In order to keep the tension during insertion below a permissible value, it is necessary to increase the length of the duct sleeve. However, an increase in the length of the duct sleeve is economically disadvantageous, such as deterioration in the manufacturability of the duct sleeve and an associated increase in costs and earthwork costs.

For the reasons stated above, it is desired to realize a duct sleeve for a porous pipe that economically satisfies the above three conditions.

[Means for solving problems]

In order to solve the conventional problems and satisfy the requirements for a duct sleeve for a porous pipe, the present invention has an eccentric duct opening for cable entry fixed via a sealant and a stopper at the tip of an outer cylinder that connects a perforated pipe to a manhole. Structure of a block-shaped duct sleeve comprising a plate and a block that is rotatably attached to and detached from an eccentric duct opening of the plate and has a cable insertion opening that is eccentric with respect to a rotating shaft through which a cable inserted into the eccentric duct opening is inserted. It is expressed as 'c%.

[For production]

The present invention makes the perforated pipe fully movable in response to expansion and contraction of the conduit and ground subsidence, maintains watertightness without damaging the connection part, and reduces the tension when the cable is inserted and reduces the cable tension by reducing the length of the duct sleeve. The position of the duct opening can be changed for each accommodation space. Embodiments will be described in detail below based on the drawings.

〔Example〕

FIGS. 1A to 1C are longitudinal cross-sectional views showing the main structure of an embodiment of the present invention. The outer cylinder 1 connects the four poles 13 and the porous pipe 10, and its base end is inserted into a duct cutout when constructing the manhole 13, and is easily installed.

On the other hand, an elastic ring 2 made of rubber is watertightly attached to the inner circumferential surface of the tip, and the end of the porous tube 10 is inserted and connected through the elastic ring 2 in a watertight manner.

Therefore, water stoppage is ensured without restricting movement of the perforated pipe 10 due to temperature expansion and contraction, earthquakes, and ground subsidence, and seismic resistance is improved.

A plate 3 is fixed to the tip of the outer cylinder 1 via a sealant 6 and a stopper 7 (see 11t- in FIG. 1C for a structural diagram). The plate 3 has a duct hole 12, and O
The block 4 is attached to the duct hole 12 via the ring 5 and the MIO hexagon socket head bolt 9. Also, because of this structure, the block 4 can be easily removed from the plate 3, so if the block 4 is reversed and attached to the plate 3 again, the duct opening 14 can be positioned in two ways.

The structure of block 4 is shown in Fig. 2 A to C, respectively.
The front and right side views are shown.

3A to 3F are diagrams illustrating an embodiment in which the block 4 is used and a cable is inserted.

The same reference numerals as in FIG. 1 indicate the same parts. The duct surface 30t in FIG. 3A is viewed from inside the manhole as shown in FIG. 3E. When the cable is inserted, the hole in the porous pipe 10 and the hole in the duct hole 12 are made at the same level in order to reduce the tension when the cable is inserted. After the cable has been inserted, the block 4 is removed from the duct hole 12 as shown in FIG. 3B, and then the block 4 is rotated in the opposite direction as shown in FIG. 3C and then installed again as shown in the third diagram. At this time, the distance between the duct surfaces will be as shown in Figure 3F. Naturally, the length of the duct sleeve is designed so that the cable fits within the accommodation space even after the block is completely reversed, but since there is no need to take into account the increase in tension when inserting the cable, if this is not taken into account, the present invention It can be much shorter than without. In addition, since the duct axis spacing can be kept above the specified value, all conventional tools can be used as is.

The outline of the present invention described above will be summarized and explained below.

When designing the entire duct sleeve for perforated pipes, two stages can be considered. The first is the cable insertion stage (Figure 3A), and the second is to keep the cable within a predetermined radius of curvature (six times the outer diameter of the cable) and prevent the cable from moving to the duct opening. This is the stage of installing tools and the like at the duct opening and accommodating the cable (FIGS. 3B to 3E).

The key point in the cable insertion stage is to reduce the tension as much as possible during cable insertion.

The important point in the cable accommodation stage is to provide a tool installation space 40f around the duct opening 14, as shown in FIG. 4, in order to install movement prevention fittings and the like. However, when considering the installation space of 40 tons for the tool, it is inevitable that each duct should be spaced at t intervals, so a level difference LD occurs between the hole of the porous pipe 10 and the duct opening 14, and the tension when inserting the cable increases. It will increase significantly. Also, since it is necessary to ensure the duct insertion length (Lx in Fig. 7) corresponding to the tool to be inserted into the duct opening 14, the duct insertion length (Lx in Fig. 7) must be secured in addition to the duct axis spacing (Ll in Fig. 7). The geometrical restriction L2) also increases the tension when the cable is inserted.

Thus, a perforated duct sleeve has contradictory requirements at the cable insertion stage and cable accommodation stage.

The simplest form (Figure 7) that satisfies this is to space the duct openings at regular intervals (fixing the duct openings in the state in which the cables are accommodated, as shown in Figure 3F), and the tension caused by this when the cables are inserted. The increase in duct sleeve length is intended to relatively reduce the total level difference. However, in this case, the length of the communicating duct sleeve becomes long, so it cannot be said to be economical. Therefore, the present invention is directed to FIGS. 1A to 1F.
As shown in Figure 2, we have created a compact design that satisfies the requirements for cable insertion and storage.

〔Effect of the invention〕

As described above, the present invention fixes the proximal end of the duct sleeve to the side wall of the manhole, and makes the end of the porous pipe movable via the elastic ring tightly attached to the distal end of the duct sleeve that extends outside the manhole. It has the advantage of maintaining watertightness without being damaged by expansion and contraction due to temperature changes, earthquakes, and ground subsidence.

In addition, by using this duct sleeve, the tension when inserting the cable can be reduced to less than the required value. After inserting the cable, the cable can be rotated a total of 1808 times to keep the cable within the specified storage space, and the duct shaft spacing can be completely There is an advantage that existing laying tools can be used since conventional cables can be secured. Furthermore, when designing the length of the duct sleeve, it is only necessary to take into consideration not the cable insertion tension but the fact that the cable is accommodated within the space, so there is an advantage that the length of the duct sleeve can be made compact.

This is economically advantageous as it improves manufacturability, reduces costs, and reduces civil engineering costs.

[Brief explanation of drawings]

Figures 1A and B are side views and sectional views of the embodiment of the present invention, Figures 2A to C are structural diagrams of the block of the present invention, and Figure 3A.
Figures 4 to 5 are diagrams explaining the present invention in detail, Figure 4 is a diagram showing the relationship between the duct opening and the tool installation space, Figure 5 is a schematic diagram of the structure of a conventional duct sleeve, and Figure 6 is a diagram of a duct sleeve for a porous pipe. Structure outline diagram, Figure 7 A and B
8 is a schematic diagram of the structure of a duct sleeve for a simple porous pipe, FIGS. 8A and 8B are schematic diagrams of the structure of a B-type cable movement prevention fitting, and FIGS. 9A to C are schematic diagrams of the structure of a bell mark for metal. 1...Outer cylinder 2...Elastic ring 3...Plate 4...Block 5...0 ring 6...Sealant 7...Stopper 8...M8 screw 9...MIO Hexagonal bolt 10... Porous pipe 11... Stopper cross section n... Duct hole 13... Manhole 100... Duct sleeve chrysanthemum... Duct surface 31... Cable 14... Duct Port 40... Tool installation space 50... Cable 5]... Conduit 52... Duct sleeve mark... Cable 61... Porous pipe 62... Partition plate 63... Duct sleeve 70 ... Porous pipe duct sleeve 71 ... Porous pipe 72 ... Porous pipe cross section 73 ... Duct mouth cross section 80 ... B-type cable movement prevention fitting 81 ... Cable 82 ... Manhole 83 ...・Duct Hole Patent Applicant Nippon Telegraph and Telephone Corporation Representative Patent Attorney Hisabe Tamamushi (2 others) Japanese company showing the relationship between the duct hole in the mulberry tree and the tool installation space 4
Fig. Structure of conventional duct sleeve iw Fig. 5 Schematic diagram of structure of duct sleeve for 4-hole pipe 6 Published by Zuisei. Figure 9: Schematic diagram of the structure of a four-metal bell mouth

Claims (1)

[Scope of Claims] A duct sleeve for cable installation in which a partition plate is provided in a conduit and a perforated pipe through which a plurality of cables are inserted is connected to a manhole by an outer cylinder, the duct sleeve comprising: a seal at the tip of the outer cylinder. a plate having an eccentric duct opening for cable entry fixed via an adhesive and a stopper; and a plate that is rotatably attached to and detached from the eccentric duct opening of the plate and is eccentric with respect to a rotating shaft through which a cable inserted into the eccentric duct opening is inserted. A block-shaped duct sleeve comprising a block having a cable insertion port.