JP3936864B2 - Cable storage duct device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cable housing duct device made of precast concrete which is laid on a floor slab for use in railways, roads and the like and houses communication cables and the like.
[0002]
[Prior art]
Floor slabs for railways, roads, etc., for example, slabs on the viaduct of the Shinkansen, are constructed with walls such as soundproof walls on the sides, and ducts are installed along these walls. Electric wires, communication lines, piping, etc. are stored. The conventional duct is made of precast concrete having a substantially W-shaped cross section as shown in FIG. 6, and is placed on the floor slab 106 by interposing a height adjusting member 121 such as a mortar or a rubber plate on the bottom bottom surface of the duct 101. It was placed.
[0003]
The duct 101 has lid plates 105 and 109 detachably mounted on the upper surface so that the maintenance of the communication cable 108 and the like can be easily performed, and at the same time, the duct 101 faces the bottom inner surface 111 from the soundproof wall 107 side toward the floor slab center. In this way, the rainwater entering the inside through the gap between the lid bodies 105 and 109 was drained to the outside more quickly than the drain holes 120 opened at predetermined intervals.
[0004]
In addition, the conventional method for fixing the duct to the floor slab is generally performed as follows. First, anchor bolts are placed on the floor slab at predetermined intervals, the bolt heads are inserted into holes in the fixing bracket provided at the bottom of the duct, and the nut is fastened to the floor slab, and then the top surface of the fixing bracket is filled with mortar. The bolt head was protected.
[0005]
[Problems to be solved by the invention]
However, such a conventional duct structure and its fixing method have the following problems. First, the height of the duct in the axial direction is adjusted with a rubber plate that is sandwiched between the duct bottom and the floor slab at the position of the anchor bolt portion, etc., but the thickness of the rubber plate is limited so that the height is accurate. Adjustment was difficult, and it was almost impossible to adjust the tilt of the duct side wall.
[0006]
In addition, conventional ducts generally have a configuration in which a rubber plate or mortar is interposed over the entire surface between the floor slabs. In addition to the fact that the wet condition at the bottom of the duct was difficult to avoid later, most of the protruding parts of the anchor bolts on the floor slab were exposed to the atmosphere, so there was a drawback that the corrosion of the anchor bolts became significant. It was. Also, in cold districts, the stagnant water at the bottom of the duct may freeze due to a decrease in the outside air temperature, and the duct may be damaged such as cracks due to the pressure on the freezing.
[0007]
The present invention has been made to solve the problems of the conventional cable housing duct and its fixing method as described above, and aims to improve duct installation accuracy, to prevent rusting of the anchor bolt and to prevent the duct main body. It aims at providing the duct apparatus for cable storage which can aim at the improvement of durability.
[0008]
[Means for Solving the Problems]
To solve the above problems, the cable storage duct system of the present invention, the floor plate to be subjected to railways and roads, and wall erected on this slab sides, the height adjusting member on the deck In a cable housing duct device having a cable housing duct made of precast concrete that is laid down while being used and fixed to a floor slab with an anchor bolt inserted through the bottom surface, the height adjusting member is disposed at an anchor bolt fastening portion. After adjusting the height by screwing on this female screw when installing the duct, and a rubber gutter opening the grout material storage opening, a female screw provided on the bottom of the duct at a position separated from the anchor bolt fastening part, A screw body which is drilled in the bottom of the duct and is removed from the female screw after being injected and cured from an injection hole located above the opening for accommodating the grout material, and the floor slab is Has a drainage slope towards the floor plate from the center side, is characterized in providing drainage space between adjacent said rubber shoes.
[0009]
Rubber bowl is excellent in cold resistance, can secure a height of about 10mm from the floor slab to the bottom of the duct as a drainage space, and can support the duct load independently even when the grout material filling the opening is destroyed Is selected. In addition, since the grout material is restrained on the side by the rubber hook, there is no fear of scattering even if it is broken.
[0010]
As the grout material, for example, polymer cement for gap filling is used to prevent rust of the anchor bolt protrusion. At least two female screws are provided in the transverse direction of the duct at intervals where the duct load can be supported, and the end of the screw is adjusted by adjusting the screwing length by abutting the tip of the screw body to be screwed to the floor slab. Adjust the axial and transverse heights.
[0011]
The wall body in the cable housing duct device according to claim 2, wherein a step portion is provided at a lower portion, and the cable housing duct laid apart from the wall body is provided between the side wall on the wall body side and the step portion. A new cable storage space is formed between the duct and the wall by laying a lid . The wall is provided with a step for laying the lid, and the floor slab between the duct and the wall is provided with a drainage gradient toward the center.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a plan view of a cable housing duct, and FIGS. 2 and 3 are a transverse sectional view and a longitudinal sectional view of the duct installed on the floor slab, respectively. The duct 1 is made of precast concrete having a substantially U-shaped cross section, and a stepped portion 3 is provided on the side wall 2 on the center side of the floor slab, and a removable lid 5 is bridged on the top of the opposite side wall 4.
[0013]
The duct 1 is installed in parallel to the wall body 7 at a predetermined distance from the wall body 7 standing on the side of the floor slab 6 used for railways, roads, etc. A new cable housing space 10 is formed by installing another lid body 9 between the side wall 4 and the side wall 4.
[0014]
Fixing brackets 12 are embedded in the duct bottom surface 11 at a predetermined interval, for example, a pitch of 1.5 m. The fixing metal 12 is composed of a fixing plate 13 and an anchor made of a steel rod (not shown). A long hole 13a for inserting an anchor bolt 14 is formed in the center of the plate 13, and a recess 16 for accommodating a filler 15 is provided above the hole 13a. Form. An injection hole 18 for the grouting material 17 is formed in the lateral side portion of the recess 16, and a female screw 19 by an insert is embedded at a position separated in the axial direction. A drain hole 20 is provided in the lower part of the side wall 2 on the center side of the floor slab. The duct bottom surface 11 is provided with a gradient toward the side wall 2.
[0015]
When installing the duct 1, surveying is performed based on a predetermined alignment, a resin adhesive is injected into a drilling hole by a drill, an anchor bolt 14 is driven, and a rubber rod 21 is placed around the anchor bolt 14. . Here, as shown in FIG. 4, the rubber punch 21 is formed with an oval opening 21a for storing a grout material at the center, and is made of a material excellent in performance at low temperature, for example, ethylene propylene rubber (EPDM).
[0016]
After the duct 1 produced in the production yard is lifted on the floor slab 6 by a lifting device such as a truck crane, the duct 1 is placed at a predetermined position with fine adjustment using a simple lifting device or the like. Next, as shown in FIG. 5, the height adjustment bolt 22 is screwed into the female screw 19, and the adjustment is performed while correcting the height and rolling. After that, the anchor bolt 14 is fastened to the fixing metal 12, the grout material 17 is injected from the injection hole 18, the oval opening 21 a of the rubber rod 21 is filled, and the filler 15 is further injected into the recess 16 to finish the surface. . After the predetermined curing period, the height adjusting bolt 22 is removed and the female screw portion 19 is appropriately filled.
[0017]
The floor slab 6 in which the duct 1 is installed has a drainage gradient formed from the wall 7 side toward the center of the floor slab, and a drainage space 23 is opened between the adjacent rubber rods 21 and 21 as shown in FIG. Has been. Accordingly, rainwater that has entered the new cable storage space 10 is immediately discharged to the outside of the duct 1.
[0018]
In addition, when the downstream drainage is stagnated due to a large amount of snow, etc., even the floor slab 6 with such a gradient has stagnated water, and the water in the gap between the duct 1 and the floor slab 6 is caused by the temperature drop. There is a risk of freezing. However, when the drainage space 23 having both sides opened as described above is provided, the frost heaving pressure quickly escapes to the side, so that no excessive stress is generated in the anchor bolt 14 or the duct 1 body.
[0019]
【The invention's effect】
As described above, in the cable housing duct device of the present invention, the height adjustment member is provided with the screw body that is screwed into the female screw on the bottom surface of the duct, so that the height adjustment in the axial direction and the transverse direction of the duct can be accurately performed. The installation accuracy of the duct can be improved. In addition, the grout material is injected into the opening of the rubber bowl, and the protruding portion of the anchor bolt is sealed with this grout material, so that the anchor bolt can be prevented from being rusted.
[0020]
Moreover, since the floor slab in which the duct is installed has a drainage gradient toward the center of the floor slab and a drainage space is provided between adjacent rubber ridges, the wet state of the duct bottom after precipitation can be avoided. Therefore, the rust prevention effect of the anchor bolt is further improved, and damage due to freezing is eliminated, and the durability of the anchor bolt and the duct body is improved.
[0021]
Since the cable storage duct device according to claim 2 forms a new cable storage space between the duct and the wall, the manufacturing cost and construction cost of the duct member are significantly reduced.
[Brief description of the drawings]
FIG. 1 is a plan view of a cable housing duct.
FIG. 2 is a cross-sectional view of a duct installed on a floor slab.
FIG. 3 is a longitudinal sectional view of a duct installed on a floor slab.
FIG. 4 is a plan view of a rubber bowl.
FIG. 5 is a cross-sectional view of a duct into which a height adjusting bolt is screwed.
FIG. 6 is a cross-sectional view of a conventional duct installed on a floor slab.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Duct 6 Floor slab 7 Wall body 10 Cable storage space 11 Duct bottom face 12 Fixing metal fixture 14 Anchor bolt 17 Grout material 18 Injection hole 19 Female screw 21 Rubber rod 21a Oval opening 22 Height adjustment bolt 23 Drainage space

Claims (2)

A floor slab used for railways, roads, etc., a wall standing on the side of this floor slab , and laying on this floor slab using a height adjusting member, and fixed to the floor slab with anchor bolts inserted through the bottom in cable storage duct system and a cable storage duct made of precast concrete, the height adjusting member comprises a rubber shoe to open the grout accommodating opening disposed in the anchor bolt fastening section, the anchor bolt A female screw provided on the bottom surface of the duct at a position separated from the section, and after adjusting the height by screwing on the female screw when the duct is installed, drilled in the bottom surface of the duct and above the opening for storing the grout material A screw body to be removed from the internal thread after injecting and hardening the grout material from the injection hole located, and the floor slab has a drainage gradient from the wall side toward the center of the floor slab, and the adjacent rubber bowl while Cable storage duct and wherein the providing drainage space. The wall body is provided with a step portion at a lower portion thereof, and the cable housing duct, which is laid apart from the wall body, is constructed by installing a lid body between the side wall on the wall body side and the step portion. 2. A cable storage duct device according to claim 1, wherein a new cable storage space is formed between the wall bodies .

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