JP2012241507A - Bottomed free-inclination side ditch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a bottomed free-inclination side ditch from a bottomed side ditch and post-cast adjusting concrete.SOLUTION: A water-passing inner bottom surface of a bottomed side ditch is formed as a flat rough surface and the like to stabilize and increase strength of adhesion to post-cast adjusting concrete.

Description

  TECHNICAL FIELD The present invention relates to a bottomed free-gradient side groove in which adjusting concrete is applied to a precast concrete side groove such as a U-shaped side groove and a box side groove as a drainage facility for roads.

Conventionally, using a gate-shaped, bottomless, precast concrete gutter body with an open bottom, laying it on the concrete base of the previous construction, forming the inner bottom to the required channel gradient, and supporting the left and right side walls as a structural material In order to do so, a free-gradient side groove is used in which the adjusted concrete having a thickness of at least 5 cm or more is cast in the field with a side groove inner width of 30 to 40 cm.
In this conventional method, the height of the side groove body remains fixed, but only the inner space height changes by adjusting the bottom part, so it is easy to perform free gradient construction. In addition, the construction period is long and the cost is high, and the gutter body is bottomless, which may make it unsafe against water leakage.
On the other hand, in the case of a bottomed U-shaped side groove, etc., when the fixed gradient is sometimes extended and the free gradient construction is performed as it is, the inner concrete bottom is adjusted concrete with a minimum thickness of 5 cm or more according to the conventional bottomless side groove, Since it is bottomed, no structural material is needed, it is only for the formation of a canal gradient, and the degree of freedom of gradient design and construction is increased by not providing the minimum thickness for the originally adjusted concrete. Adhesion with the main body may not be stable due to post-cooking, and may not be suitable for impact such as scoops in maintenance and cleaning with pressurized water.
And when the presence or absence of the adjustment concrete is mixed in the bottomed side groove extension, the difference in roughness coefficient is generated and there is an indication that it is not preferable hydraulically, but the difference in roughness is eliminated by secular change.
In addition, the U-shaped side groove is used to adjust the mounting height of the hanging lid at the upper part, and the side groove itself is formed to have a free height. .

  JP 2001-123519 A

In the fixed gradient construction, the side groove with the bottom is generally popular, and if it can be adapted to the free gradient construction as it is, there is no need to use a gate shape or a partially improved U shape.
Therefore, in the bottomed side groove, the post-adjustment concrete on the bottom surface in the side groove is stably adhered to the buoyancy due to water flow and impact during maintenance, even with a minimum thickness of 5 cm, and the exposed surface on the bottom surface in the side groove is Even if the presence or absence of adjustment concrete is mixed in the side groove extension on the skin surface close to the finish of the adjustment concrete, there is little difference in the roughness coefficient immediately after construction, which is hydraulically preferable.
And, in the construction conditions that adjust the gradient of the entire side groove extension, the bottom surface in the side groove is not exposed and is not related to the water flow, so it is a rough surface that is optimally suited only for jointing of the adjusted concrete, and the minimum thickness of the adjusted concrete is reduced. Even if it is 5 cm or less, the slope adjustment margin is widened and the degree of freedom in design is increased.

In order to solve the above problems, the bottomed concrete gutter structure of the present invention has the following structure:
In the construction conditions in which adjusted concrete is cast only in the necessary part of the side groove extension,
The flat surface of the inner bottom of the water flow is formed into a rough rough surface with rough mortar finish, zero slump concrete finish, convex or concave dot aggregate, etc., and the adhesion area is increased and gripping with post-cast concrete and grip In addition, the exposed skin surface itself on the bottom surface of the water passage without adjusting concrete is brought close to the roughness of the finish surface of the in-situ adjusted concrete surface by the flat rough surface.

In addition, in concrete gutters where the slope adjustment is over the entire gutter extension and the adjustment concrete is applied exclusively as construction conditions,
The inner bottom surface has an increased adhesion area and meshes with the concrete joint surface including the coarse aggregate inside the concrete to increase the bonding strength, and is formed into a rough surface such as rippling, picking, washing out or split.

In the free-graded construction of the bottomed side groove, the adhesion and grip with the concrete to be adjusted later on the inner bottom are maintained, and the side groove structure is stable against buoyancy and adapted to maintenance management.
Since the concrete gutter itself has a bottomed structure, the construction time is shortened because no base concrete is required for construction, and water leakage from the bottom does not occur.
And, it is easy and reliable to place the adjusted concrete, and it can be built at a low cost as the whole material and construction cost.

In the conventional bottomed side groove, the inner bottom surface gradually changes from the polished surface by the formwork iron plate immediately after construction to the same skin surface as the cast-in-place concrete finish over time,
When the inner bottom surface is a flat rough surface in the bottomed side groove of the present invention, the skin surface state close to the on-site concrete finish immediately after construction is substantially maintained, and the secular change on the hydraulic surface is small.

  On the other hand, the post-adjusted concrete surface is kept close to the flat rough surface at the bottom of the concrete side groove of the present invention, so that the state with little secular change is maintained. The difference is small and hydraulically preferable.

If necessary, the formation of a flat rough surface on the bottom surface of the bottomed groove where after-adjustment of the adjusted concrete and an uneven rough surface of the bottom surface of the bottomed-side groove where after-adjustment of the adjusted concrete is a conventional manufacturing process will increase the cost. Does not occur.
And when the bottom face in a side groove is a flat rough surface, even if the minimum thickness of the adjustment concrete is 5 cm, it is stable.
In addition, when the inner bottom surface is a rough surface, the minimum thickness of the adjustment concrete may be 5 cm or less, and the slope adjustment margin increases and the degree of freedom in setting the side groove drop becomes high.

  It is a notch slope figure which shows the Example of a bottomed free-gradient side groove | channel using a cover.   It is sectional drawing along the AA line of FIG.   It is a perspective view of the bottomed side groove | channel by the U-shaped side groove | channel in the Example of FIG.   It is a slope view of the Example by the bottomed side groove | channel and drop lid of a drop lid type.   It is a perspective view of the Example by the bottomed side groove | channel of a lid type with a flange, and a lid with a flange.   It is a perspective view of the Example by a box part side drop type bottomed side groove | channel and a drop lid.   It is a perspective view of the Example by the bottomed side groove | channel of a box partly drop type | mold with a slit, and a drop cover with a slit.

  In the case of a U-shaped side groove, it is precast concrete with an inner width of 30-40 cm, an inner height of 10 cm, a length of 30-120 cm, a length of 1 m, 2 m, etc., and is laid on the foundation with a fixed gradient. I will beat it later.

The bottomed side groove for post-adjusting the adjusted concrete as required has a water-flowing inner bottom formed on a flat rough surface.
The rough rough surface is roughly 3 mm or less on the flat surface, and rough mortar finish, zero slump concrete finish, convex or concave dot aggregate, etc. under conditions that can be easily removed from the mold. The surface portion is made of mortar material.
Convex or concave dots are gathered on a flat surface in an equally spaced polka dot pattern (not shown) or the like, and have a truncated cone, spherical shape, etc., and generally have a diameter of 3 to 5 mm, a height of 1 to 3 mm, and a center interval of 10 ˜30 mm.
The flat rough surface is only the bottom surface in the side groove, and the rising surfaces of both side walls and the corner curved surface remain the same polished surface as the conventional products, but only the mortar bites into the bottom surface of the joint with post-cast concrete. Adhesion and grip are improved and adjustment concrete adheres.

The bottomed gutter, which is used exclusively for adjusting concrete, has a water-flowing bottom surface formed on a rough surface.
The rough rough surface is approximately 5-15mm deep without a flat surface, and is made into a wavy shape or a suspended shape under the condition that it can be easily removed from the formwork. Becomes a material containing coarse aggregate.
The uneven surface is only the bottom surface in the side groove, and the rising surfaces of both side walls and the corner curved surface remain the same polished surface as conventional products, but the joint part with post-cast concrete also includes coarse aggregate The mountains and valleys mesh with each other, and the strength of the connecting surface is high and stable.
And if adjustment concrete is switched to mortar as needed, reduction to the minimum thickness of about 2 cm is also possible.
Even if the head of the ditches is 1 cm, the effect is great, and in particular, by reducing the minimum thickness of the adjusted concrete, it is possible to set a free gradient with no loss of water depth.

FIG. 1 shows the construction state of the example.
(1) is a bottomed side groove formed by a U-shaped side groove, and (2) is a cover.
As shown in FIGS. 1, 2, and 3, the bottomed side groove (1) has an inner bottom surface (10) that is formed into a flat rough surface (11) with or without adjusting concrete.
The bottomed groove (1) is laid with a fixed slope on the foundation (20) with the upper surface aligned with the road.
And adjusting concrete (5) is laid according to the drainage gradient, and the hanging lid (2) is continuously placed to construct a bottomed free gradient side groove.

As shown in FIGS. 1 and 3, the bottomed side groove (1) by the U-shaped side groove is supplied as a precast product having a length of 1 m, 2 m, and the like, an inner width of 30 to 40 cm, and an inner height of 10 cm.
The hanging lid (2) is supplied as a precast product having a length of 0.5 m, 1 m, etc. as shown in FIGS. 1 and 2, and in this embodiment is an L-type with curb.
The hanging cover (2) of this embodiment has the same width as the bottomed side groove by the U-shaped side groove, and has a thickness strength corresponding to the conditions of the loading load and the side pressure load.

FIG. 4 shows an example of a drop lid type.
(1) is a bottomed side groove formed by a drop lid side groove, and (3) is a drop lid.
As shown in FIG. 4, the bottomed side groove (1) has an inner bottom surface (10) formed on a undulating rough surface (12) for free gradient construction where the adjustment concrete is post-treated.

FIG. 5 shows an embodiment of a lid type with flange.
(1) is a bottomed side groove formed by a flanged lid type side groove, and (4) is a flanged lid.
As shown in FIG. 5, the bottomed side groove (1) has an inner bottom surface (10) formed as a flat rough surface (11) with or without adjusting concrete.

FIG. 6 shows an embodiment in which a part of the box is dropped and a lid type is used in combination with the upper surface closing type where there is no adjustment concrete.
(1) is a bottomed side groove by a box type side groove, and (3) is a drop lid.
The bottomed side groove (1) is a bottomed free-gradient side groove whose inner bottom surface (10) is formed into a flat rough surface (11) as shown in FIG.
FIG. 7 shows an example in which a box with a slit is partially dropped and is used in combination with an upper surface closing type in a place where there is no adjustment concrete, and (6) is a slit.
(1) is a bottomed side groove by a box side groove with a slit, and (2) is a drop lid with a slit.
As shown in FIG. 7, the bottomed side groove (1) is a bottomed free-gradient side groove in which the inner bottom surface (10) is formed into a flat rough surface (11) and whether or not adjustment concrete is applied.

The type with or without adjusting concrete with the bottomed side groove of the present invention is suitable for construction with only a fixed gradient without any subsequent work, and can be used together with conventional general distribution products, so there is no restriction in terms of diffusion.
Since the formwork is the same as that of the conventional general products except for the flat rough surface or the uneven rough surface, it can be distributed at a low cost in production and supply as well as conventional road concrete products.

DESCRIPTION OF SYMBOLS 1 Bottomed side groove 2 Hanging lid 3 Dropping lid 4 Flange lid 5 Adjustable concrete 6 Slit 10 Inner bottom surface 11 Flat rough surface 12 Unland rough surface 20 Foundation

Claims (2)

  In a free-graded construction side groove in which adjusted concrete is post-casted to the inner bottom of the precast concrete bottomed side groove, adhesion to the inner bottom post-cast concrete is stable and the inner bottom surface is post-casted with or without adjusted concrete. In order to achieve a roughness close to the finished surface, the bottom of the water passage of the side groove is formed into a flat rough surface such as rough mortar finish, zero slump concrete finish, convex or concave dot aggregate, etc. Gradient gutter.   In the free-graded construction side groove in which the adjusted concrete is cast after the inner bottom of the precast concrete bottomed side groove, the joint strength of the concrete connection surface is increased and the minimum thickness of the adjusted concrete is reduced to increase the degree of freedom for design and construction. In order to increase the bottom, the bottom-floored free-gradient side groove is characterized in that the bottom surface of the water passage of the side groove is waved, suspended, washed out, formed into a rough surface such as a split shape.

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