JPH08239891A - Block for box culvert and box culvert construction method using it - Google Patents

Abstract

PURPOSE: To easily construct a box culvert whose weight is lightened and bottom placing concrete for channel inclination is hard to exfoliate even used for a long period. CONSTITUTION: A block which is a large approximately rectangular block body (B) integrated and surrounded with four faces composed of a bottom part 1, a top part 2 and side parts 3, 3, and is so formed that mountain parts 12 and valley parts 13 are coupled with each other into a corrugated shape such as a mountain, a valley, a mountain,... a valley, and a mountain in the perpendicular direction to the side parts 3, 3 in the upper face of the bottom part 1. A plurality rows of block bodies (B) are arranged and bottom placing concrete 5 is placed on the mountain parts 12, 12... and the valley parts 13, 13... in their insides so as to construct a box culvert. Because the bottom part of the block is thus coupled into a corrugated shape, both merits of light weight and durability improvement can be simultaneously actualized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved box culvert block and a method of constructing a box culvert using the block, and more specifically, to a box culvert that can be lightened at the time of on-site construction. Moreover, the present invention relates to a block capable of increasing the adhesion strength with bottom-filling concrete for forming a waterway gradient, and a box culvert construction method using such a block.

[0002]

2. Description of the Related Art As is well known, underground culverts are used for irrigation and drainage of farmland, roads, parks,
Widely used for underground drainage such as hillsides. As materials used for this type of culvert, it is possible to adopt natural materials such as lintel, bamboo and logs, and artificial materials such as earth pipes and concrete pipes. Among these materials, concrete pipes having excellent durability are frequently used, and examples thereof include integrally molded concrete block having a box-shaped cross section and separated type L-shaped and U-shaped concrete blocks.

However, the weight of the former box-shaped concrete block tends to increase, and it is difficult to carry the block to the site or install it on the site. In the latter type of concrete block, the weight of the block itself is lighter, so the above work difficulties can be solved, but the number of members increases compared to the former block, and it is necessary to connect these members. In addition to the time-consuming work, it was unavoidable that the strength at the time of connection was lower than that of the former block.

Further, in both of the concrete blocks, since the inner peripheral surfaces thereof are formed flat,
When the bottoming concrete for forming the drainage canal for draining the underdrain was cast on the upper surface of the bottom of the block, the adhesion strength was weak and the bottoming concrete was easily peeled off.

[0005]

The present invention has been made in view of the above-mentioned drawbacks of the conventional culvert block, and is intended to reduce the weight without lowering the structural strength. It is a technical object to provide a block for a box culvert capable of increasing the adhesion strength with bottom-filling concrete for forming a waterway gradient.

Another technical object of the present invention is to provide a box culvert construction method capable of easily constructing a box culvert in which bottom concrete for a waterway gradient is hardly peeled off even after long-term use.

[0007]

Means adopted for solving the technical problems Means adopted by the inventor for solving the above technical problems will be described with reference to the accompanying drawings.

That is, the present invention is a block body B having a substantially rectangular tube shape, which is integrally surrounded by four surfaces composed of a bottom portion 1, a top portion 2 and side portions 3 and 3. The above technical problem is solved by adopting a block in which a ridge portion 12 and a valley portion 13 are vertically connected to the side portions 3 and 3 and are connected in a wave shape with ridges, valleys, mountains ... The point is that it was done.

Further, the present invention is a member having a substantially rectangular tubular shape in which four surfaces, which are composed of a bottom part 1, a top part 2 and side parts 3 and 3, are integrated, and the side part 3 is provided on the upper surface of the bottom part 1.・ A plurality of block bodies B and B formed by mountain portions 12 and valley portions 13 which are vertically connected with respect to 3 and are connected in a wavy manner with mountains, valleys, mountains ... Are lined up in the direction, and while pouring fresh concrete N into the inside of these block bodies BB,
Boxes are formed by placing a bottom-filling concrete 5 of a required thickness on the mountain portions 12, 12 ... and valley portions 13, 13 of the bottom portion 1, and forming a water flow gradient G in the cylinder axis direction on the bottom-filling concrete 5. The feature is that the above technical problems are solved by adopting a means of constructing the culvert C.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the embodiments shown in the accompanying drawings. 1 is a perspective view of an embodiment block according to the present invention, FIG. 2 is a cross-sectional view taken along line XX of FIG. 1, FIG. 3 is a perspective view of an embodiment block according to a modification of the present invention, and FIG. FIG. 5 is a perspective explanatory view of a connection construction state of the embodiment blocks according to the present invention, and FIG. 5 is a sectional explanatory view taken along the line YY of FIG.

First, a block diagram of an embodiment according to the present invention is shown in FIG.
And it demonstrates based on FIG. In the drawing, what is indicated by the symbol B is a block body having a substantially rectangular tube shape, and the four surfaces composed of the bottom portion 1, the top portion 2 and the side portions 3 and 3 are integrated to form a box body. The bottom portion 1 of the block body B includes a base portion 11, a mountain portion 12 and a valley portion 13, and a reinforcing bar 14. Further, the top surface of the base portion 11 has a mountain portion 12 and a valley portion 13 which are vertically connected to the side portions 3 and 3 and are formed in a wavy manner with the mountains, valleys, mountains ... The corrugated structure is significantly different from the conventional box-shaped block structure. That is, in the conventional box-shaped block, the inner peripheral surface of the box-shaped block is generally flat. In the present embodiment, the corrugated structure as described above on the upper surface of the bottom portion 1 is formed in a trapezoidal shape as shown in FIG. 2, but triangular, semicircular, pyramidal or conical projections are formed in a concavo-convex pattern. It is also possible. And FIG.
As shown in FIG. 5, the thickness of the base portion 11 of the bottom portion 1 is thinner than the thickness of the bottom portion of the conventional box-shaped block, and the reinforcing bars 14 are provided inside the peak portions 12, 12, ... ·14…
Since the ribs are arranged, the strength of the block portion B is never reduced due to the thinning of the bottom portion in combination with the rib effect of the mountain portion 12, and the weight of the block body B can be reduced. In the base portion 11 of the bottom portion 1, like the conventional box-shaped block,
Reinforcing bars 14 and 14 ... are laid out only in the required amount.
It is possible to provide sufficient structural strength against the load from above the block body B by using 14 and the reinforcing bars 14 and 14 in the mountain portions 12 and 12 in combination.

An opening 21 is provided at the top 2 of the block B.
And a taper is formed on the inner peripheral surface of the opening 21 so as to narrow downward. As a result, fresh concrete described below can be poured from the opening 21 into the block B, and workability can be improved when the box culvert is installed on site. Further, what is indicated by reference numeral 4 is a substantially rectangular parallelepiped lid body, and a taper is formed on the outer peripheral surface of the side portion of the lid body 4 so as to narrow downward. As a result, just by placing the lid body 4 on the opening portion 21 from above, the lid body 4 is fitted into the opening portion 21 and the top portion 2 of the block body B is completely closed.

Next, an embodiment block of a modification of the present invention will be described with reference to FIG. The block of this embodiment is almost the same as the block described above, but the shape of the lid 4 is different. In the block of this embodiment, the lid 4 has a substantially disc shape, and a taper is formed on the peripheral surface of the lid 4 so as to narrow downward. An opening 21 is bored in the top 2 of the block B so as to conform to this taper, and like the block described above, the lid 4 is placed on the opening 21 from above, and the opening 21 is inserted into the opening 21. When fitted, the top 2 of the block body B is closed.

Finally, a method of constructing a box culvert using the block body B will be described with reference to FIGS. 4 and 5. First, a groove for forming a water channel is dug in the ground, and a plurality of the rectangular tubular block bodies B, B are formed along the groove.
Are arranged in the axial direction of the cylinder. At this time, although the block bodies B are arranged as close to each other as possible, it is also possible to enhance the watertightness by sealing the gap as needed. Next, when the required amount of fresh concrete N is poured from the opening 21 of any block body B among the plurality of block bodies B, B ..., The bottom portion 1 of the block bodies B, B ...
The mountain portions 12, 12 ... and the valley portions 13, 13 ... Simultaneously with this operation, a water passage gradient G is formed in the cylinder axis direction so that the flow velocity of the drainage flowing in the blocks B, B ... Is at an appropriate speed. Then, when the injected fresh concrete N is cured for a required period, the bottom-filled concrete 5 having the water flow gradient G is formed on the mountain portion 12.
A box culvert C as shown in FIG. 4 is formed by closely adhering the required thickness to the 12 and the valleys 13 and 13.

In the box culvert C as described above, the contact area between the bottom concrete 5 and the bottom portion 1 of the block body B is such that the bottom portion 1 of the block body B is corrugated, and therefore the inner peripheral surface is Is much larger than the flat conventional block, and as a result, the adhesion strength on the entire contact surface is increased and the bottoming concrete 5 is less likely to peel off than when the conventional block is used. Further, since the bottom-filling concrete 5 itself has a function of connecting the block bodies B to each other, the box culvert C is extremely strong even if the block bodies B are not fixed with a connecting member such as a screw or a bolt. It can be easily installed in various connected states.

The embodiments of the present invention are generally as described above, but the present invention is by no means limited to the above-mentioned embodiments, and various modifications can be made within the scope of the claims. For example, in this embodiment, although the reinforcing bars 14 are arranged in the bottom portion 1 of the block body B, if the reinforcing bars 14 have sufficient structural strength, the block body in which the reinforcing bars 14 are not arranged is arranged. It is also possible to adopt B, and it is also possible to construct the box culvert C by using the corrugated block body B of this embodiment and a conventional block having a flat inner peripheral surface, and any of these changes It goes without saying that the embodiment also belongs to the technical scope of the present invention.

[0017]

As described above with reference to the embodiments, according to the present invention, since the bottom portion of the block is formed in a wave shape, the weight of the material corresponding to the valley portion can be reduced as compared with the conventional block. As a result, it becomes possible to improve workability when transporting the block or constructing the box culvert.

Further, since the adhesion strength between the bottom of the block and the bottoming concrete for the waterway gradient can be increased, it is possible to easily construct a box culvert in which the bottoming concrete is hard to peel off even after long-term use. Therefore, the advantages of both weight reduction and durability improvement can be realized at the same time, and the industrial utility value is extremely large.

[0019]

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment block according to the present invention.

2 is a cross-sectional view taken along the line XX of FIG.

FIG. 3 is a perspective view of a modified example block according to the present invention.

FIG. 4 is a perspective explanatory view showing a connected construction state of the example blocks according to the present invention.

5 is a cross-sectional explanatory view taken along the line YY of FIG.

[Explanation of symbols]

 B Block body C Box culvert N Ready-mixed concrete G Water flow gradient 1 Bottom part 11 Base part 12 Mountain part 13 Valley part 14 Rebar 2 Top part 21 Opening part 3 Side part 4 Lid body 5 Bottom concrete

Claims (4)

[Claims] 1. A block body B having a substantially rectangular tube shape, in which four surfaces composed of a bottom portion 1, a top portion 2 and side portions 3 and 3 are integrally enclosed, and the side portion 3 is provided on an upper surface of the bottom portion 1.・ 3
The mountain portion 12 and the valley portion 13 are vertical to the mountain / valley / mountain ... valley /
A box culvert block characterized by being formed in a wavelike relationship with mountains. 2. A block body B having a substantially rectangular tube shape, in which four surfaces composed of a bottom portion 1, a top portion 2 and side portions 3 and 3 are integrally enclosed, and the side portion 3 is provided on the upper surface of the bottom portion 1.・ 3
The mountain portion 12 and the valley portion 13 are vertical to the mountain / valley / mountain ... valley /
A box culvert block characterized in that it is formed in a wave-like relationship with a mountain, and at least the mountain parts 12, 12, ... Of the bottom part 1 are provided with reinforcing bars 14, 14 ,. 3. A substantially rectangular prismatic block body B having four surfaces composed of a bottom portion 1, a top portion 2 and side portions 3 and 3, which are integrally enclosed, and the side portion 3 is provided on the upper surface of the bottom portion 1.・ 3
The mountain portion 12 and the valley portion 13 are vertical to the mountain / valley / mountain ... valley /
It is connected to the mountain in a wave shape and has an opening 21 at the top 2.
The box culvert block is characterized in that the lid 4 is formed so that it can be fitted into the opening 21. 4. A member having a substantially rectangular tubular shape in which four surfaces, which are composed of a bottom portion 1, a top portion 2 and side portions 3 and 3, are integrated,
On the upper surface of the bottom portion 1, a plurality of block bodies B are formed by ridges 12 and valleys 13 which are vertically connected to the side portions 3 and 3. B ... are lined up in the cylinder axis direction along the water channel forming portion, and while the concrete concrete N is poured into the inside of these block bodies B.B ...., the mountain portions 12.12 ... and the valley portions 13.13 of the bottom portion 1 are formed. A box culvert construction method characterized by placing a bottom-filling concrete 5 of a required thickness on the top, forming a water flow gradient G in the cylinder axis direction on the bottom-filling concrete 5, and constructing a box culvert C.