JP2001081796A - Rise pipe lid structure - Google Patents

Abstract

(57) [Summary] An object of the present invention is to prevent the ground surface around a rising pipe rising from the drainage pipe toward the ground surface from being depressed. A ring-shaped spacer (6) is fitted around the outer periphery of a lid frame (4) supported on a ring-shaped pedestal (3) installed around the upper end of a riser (1). The surrounding crushed stone layer M is filled with the recessed portion forming portion when the pedestal 3 is installed, and the thickness of the asphalt layer A formed on the crushed stone layer M is made uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a lid disposed at an upper end of a rising pipe rising from a drainage pipe buried underground to the surface of the ground.

[0002]

2. Description of the Related Art Drainage pipes buried underground are provided with, for example, mergers, from which risers rise to the ground surface for inspection and cleaning from the ground. . The drainage pipe is disposed, for example, in a pipe trench dug on the side of the road and is backfilled with earth and sand S.
And an asphalt layer A is provided on the crushed stone layer M. Conventionally, as shown in FIG.
An inner lid (2) is attached to the upper end opening of (1), and a ring-shaped pedestal (3) is installed in the crushed stone layer M around the upper end of the riser (1). A structure is provided in which a lid frame (4) is supported on a pedestal (3), and a protective lid (5) is fitted to the lid frame (4). In this configuration, the upper surface of the protective lid (5) is set at substantially the same level as the surface SU of the asphalt layer A as the ground surface.

[0003]

In the above conventional structure, a recess is formed in the crushed stone layer M provided on the backfilled soil S around the upper end of the riser pipe (1). A pedestal (3) is placed on the pedestal (3), and a lid frame (4) is further supported on the pedestal (3). Then, an asphalt layer (A) is formed on the crushed stone layer (M). Therefore, the asphalt layer A around the lid frame (4)
The thickness of the asphalt layer A is increased by the depression formed in the crushed stone layer M, and the cooling shrinkage of the asphalt layer A is increased in this portion.
In addition, since asphalt tamping is likely to occur insufficiently around the lid frame (4), there is a problem that the surface (ground surface SU) of the asphalt layer A around the protective lid (5) is depressed as shown by a dotted line.

[0004]

According to the present invention, as a means for solving the above-mentioned conventional problems, a rise pipe (1) which rises from a drainage pipe buried under the ground to the surface of the ground is provided. A ring-shaped pedestal (3) is installed on the pedestal (3), and a lid frame is placed on the pedestal (3).
(4) is supported, and a protective cover (5) is fitted on the lid frame (4), and a riser pipe (6) fitted with a ring-shaped spacer (6) on the outer periphery of the lid frame (4). (1) The lid structure is provided. In general, the drainage pipe is backfilled with sediment S in the pipe groove, a crushed stone layer M is provided on the sediment S, and an asphalt layer A is provided on the crushed stone layer M. The upper surface of the ring-shaped spacer (6) of the crushed stone layer M is substantially at the same level as the lower surface of the asphalt layer A, and the upper surface of the protective lid (5) is at substantially the same level as the surface SU which is the surface of the asphalt layer. It has been.

[0005]

[Operation] A concave portion is formed in the crushed stone layer M around the lid frame (4), and a ring-shaped spacer is formed on the outer periphery of the lid frame (4).
Since (6) is fitted, the recess forming portion of the crushed stone layer M is filled with the spacer (6). Therefore, the thickness of the asphalt layer A formed on the upper side of the crushed stone layer M does not increase around the lid frame 4, so that the cooling shrinkage of the asphalt layer A does not increase even in this portion.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in FIGS. 1 to 3. (1) is, for example, underground (in a pipe groove).
A rising pipe rising from the junction of the drainage pipes buried in the ground to the surface SU, and an inner lid (2) is fitted to an upper end opening of the rising pipe (1). I have. The riser
Around the upper end of (1), a depression is previously formed in the crushed stone layer M formed on the backfilled sediment S, or a depression is formed by excavation, and the riser pipe is formed.
A ring-shaped pedestal made of plastic such as resin concrete, polyethylene, or polypropylene, or a recycled product of these plastics, etc. around the upper end of (1)
Is installed.

A low step portion (3A) into which the lid frame (4) is fitted is formed on the inner side of the upper surface of the pedestal (3), and the low step portion (3A) is provided on the pedestal (3) via the low step portion (3A). Supports the lid frame (4), but the lid frame (4)
Is a cylindrical body (4A), a flange (4B) provided on the lower edge of the cylindrical body (4A), and the flange (4B) from the side of the body (4A).
The main body (4A) is provided with a supporting step (4D) for supporting a protective lid (5) on the inner periphery thereof. A ring spacer (6) made of concrete, resin concrete, plastic such as polyethylene, polypropylene, plastic foam such as polystyrene foam, polyurethane foam, polypropylene foam, etc. is fitted around the outer periphery of the frame (4). .

The plastic foam used as the material of the spacer (6) is, for example, a polystyrene foam having an expansion ratio of 15 to 60 times, preferably 2 times.
In the case of a polystyrene foam, a heat-resistant sheet such as polyester is desirably applied.

A plurality of grooves (6A) for fitting the reinforcing beams (4C) of the lid frame (4) are provided on the inner periphery of the spacer (6), and the spacer (6) is attached to the lid frame (4). 4), the reinforcing beam (4C) of the lid frame (4) is fitted into the groove (6A) of the spacer (6).

After the lid frame (4) is supported on the pedestal (3) as described above, an asphalt layer (A) is formed on the crushed stone layer (M). In this state, the upper surface of the spacer (6)
The upper surface (the lower surface of the asphalt layer A) is at substantially the same level, and the protective cover (5) fitted to the lid frame (4) and the upper surface (the ground surface SU) of the asphalt layer A are at substantially the same level.

The asphalt layer A is formed by pouring asphalt in a heated and melted state onto the crushed stone layer M. The spacer 6 is also provided around the lid frame 4 so that the recessed portion of the crushed stone layer M is formed. Filling the formed part, the spacer
Since the upper surface of (6) is substantially at the same level as the upper surface of the crushed stone layer M, the thickness of the asphalt layer A does not increase in this portion as well. Therefore, the amount of cooling shrinkage of the asphalt layer A in this portion is substantially the same as the amount of cooling shrinkage of the asphalt layer A in other portions, and a concave portion is formed on the surface (ground surface SU) of the asphalt layer A around the protective cover (5). Will not be. Also, since the crushed stone does not enter the periphery of the lid frame (4) due to the presence of the spacer (6), the surface of the asphalt layer A around the protective lid (5) due to insufficient compaction of the crushed stone and asphalt around the lid frame (4). The concave portion is not formed on the (surface SU).

[0012]

As described above, according to the present invention, no recess is formed on the surface of the riser around the protective cover, and the flatness of the ground is ensured.

[Brief description of the drawings]

 1 to 3 show one embodiment of the present invention.

FIG. 1 is a sectional view of a riser pipe upper side.

FIG. 2 is a partially exploded perspective view of a lid frame.

FIG. 3 is a plan view of a lid frame.

FIG. 4 is a cross-sectional view of a conventional riser upper part.

[Explanation of symbols]

 1 Rise pipe 2 Inner lid 3 Pedestal 4 Lid frame 5 Protective lid 6 Spacer M Crushed stone layer A Asphalt layer SU Ground surface (Asphalt layer surface)

Claims (2)

[Claims] 1. A ring-shaped pedestal is installed around an upper end of a rising pipe rising from a drainage pipe buried underground to the surface of the ground, and a lid frame is supported on the pedestal. A structure in which a protective cover is fitted on the frame, and a ring-shaped spacer is fitted on the outer periphery of the cover frame, wherein a riser lid structure is provided. 2. The drainage pipe is backfilled with sediment in a pipe groove, a crushed stone layer is provided on the sediment, an asphalt layer is provided on the crushed stone layer, and the asphalt layer is provided on the crushed stone layer. 2. A riser lid structure according to claim 1, wherein the upper surface of the ring-shaped spacer is substantially at the same level as the lower surface of the asphalt layer, and the upper surface of the protective lid is at substantially the same level as the ground surface as the asphalt layer surface.