JP2775358B2 - Dam embankment construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a dam embankment.

[0002]

2. Description of the Related Art Heretofore, a dam body has been divided into several parts, and each part includes a work such as a formwork, placing concrete in a formwork, and curing concrete. Again, before the next part of the formwork,
It is constructed by performing a green cut (cleaning of the joint surface) on the surface of the solidified concrete after curing, which will be the joint with the next part, and thereafter repeating these operations.

[0003]

However, in the above-mentioned conventional embankment construction method, in the work of dividing the entire embankment into several parts, a formwork for concrete casting and green cutting work are performed. It has to be performed, and there is a problem that the number of work steps is large and complicated, and the work period is lengthened. In addition, since the formwork is an operation that is difficult to automate, there is a problem that it is difficult to reduce the construction cost and the construction period by making the entire embankment construction operation unmanned. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dam embankment construction method capable of shortening the work period and reducing the construction cost.

[0004]

In order to achieve the above object, the present invention provides a method of preparing a large number of concrete blocks of a predetermined shape in advance and stacking the concrete blocks.
Constructing the surface wall of the dam embankment, filling the inside of the constructed surface wall with the aggregate, and solidifying the aggregate to integrate the surface wall and the aggregate to construct the embankment; An injection path connecting an exposed surface of the concrete block, which is exposed to the outside after the construction of the embankment body, and a joint surface of the concrete block with which an adjacent concrete block contacts when the concrete blocks are stacked, After the concrete blocks are stacked, a filler is injected into the injection channel from the exposed surface side and discharged from the joint surface side of the injection channel, and the concrete block is joined by the discharged filler. The gap between the faces was filled.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing one embodiment of the dam embankment construction method of the present invention. First, in FIG.
Reference numeral 12 denotes a concrete block, which is made of precast concrete (including prestressed concrete) manufactured in advance at a factory or the like (not shown).

As shown in FIG. 1, the concrete blocks 11 and 12 have approximately L
There are a concrete block 11 having a U-shape and a substantially U-shaped concrete block 12 used on the upstream side of the embankment T. The front (exposed) of each concrete block 11, 12 which is exposed outside after the embankment T is constructed. Surface) 11a, 12a
Is provided with an inlet 21 for injecting, for example, a grout material.

On the other hand, the concrete blocks 11, 1
When the concrete blocks 2 are stacked as shown in FIG. 1, the grout material injected from the inlet 21 is provided on upper and lower surfaces (joining surfaces) 11b, 11c, 12b, 12c where the upper and lower adjacent concrete blocks 11, 12 are in contact. Outlet 2 from which water is discharged
2 is provided, and the outlet 22 and the inlet 21 communicate with each other through an inlet 23 formed inside the concrete blocks 11 and 12. In this embodiment, the back 1 of the concrete blocks 11 and 12 is used.
The discharge ports 24 are also provided in 1d and 12d, and the discharge ports 24 communicate with the injection path 23 through the injection path 25.

On the upper surface 11b of each concrete block 11, a convex portion 31 as shown in FIG.
A concave portion 3 having a shape corresponding to the convex portion 31 is formed on the lower surface 11c.
As shown in FIG. 1, when the concrete blocks 11 are stacked up and down, the projections 3 provided on the upper surface 11b of the lower concrete block 11 are formed.
1 engages with a concave portion 32 provided on the lower surface 11c of the upper concrete block 11b. The upper and lower surfaces 12b, 12b of the concrete block 12 are
The same applies to the convex portions 33 and the concave portions 34 provided in c. Further, in FIG. 1, reference numeral 40 denotes an aggregate. The aggregate 40 is made of, for example, prepacked concrete as a base material mixed with an injecting material such as high performance mortar or biscrete.

Next, the construction work of the embankment T according to this embodiment will be described. First, the concrete block 12 is arranged on the upstream side of the location where the embankment T is to be constructed, and the concrete block 11 is accumulated on the downstream side using a tower crane 50 or the like. Are formed. In this case, as described above, the upper and lower concrete blocks 11 and 11 (the concrete blocks 12 and 12) are stacked so that the convex portions 31 and the concave portions 32 of the concrete blocks 11 and 11 are engaged with each other.
Outlet 2 provided on lower surface 11c (12c) of (12)
2 is engaged with the discharge port 22 provided on the upper surface 11b (12b) of the lower concrete block 11 (12).

A concrete block 1 having a certain number of steps
At the time when the concrete blocks 1 and 12 are stacked, the aggregate 40 is placed in the space S between the stacked concrete blocks 11 and 12.
Is filled using, for example, a bucket or the like. In addition, in the aggregate 40, the operation of mixing the above-described injection material such as high performance mortar or biscrete into the prepacked concrete as the base material may be performed in advance before filling the space S. Alternatively, the space S may be filled with prepacked concrete first, and the injected material may be mixed later.

Thereafter, the above operation is repeated to solidify the aggregate 40, and grout is injected from the injection port 21 and the grout is injected into the upper and lower surfaces and the back surfaces 11b, 11c of the concrete blocks 11, 12. , 11d, 1
The grout material is discharged from discharge ports 22 and 24 provided in 2b, 12c and 12d so that the grout material is removed from the gap between the upper and lower concrete blocks 11, 11 and 12 and between the concrete blocks 11 and 12 and the aggregate 40. To improve the water stopping and water shielding properties of the embankment T.
As the grout material, it is preferable to use a low heat generation or non-shrinkage type material in order to prevent cracks due to temperature.

[0012]

As described above, according to the dam embankment construction method of the present invention, a large number of concrete blocks having a predetermined shape are prepared in advance, and the concrete blocks are stacked.
Construct a surface wall of a dam embankment, fill the inside of the constructed surface wall with aggregate, and solidify the aggregate to integrate the surface wall and the aggregate to construct an embankment. As a result, troublesome operations such as formation and installation of the formwork, curing of the concrete poured into the formwork, and green cutting (cleaning of the joint surface) can be omitted.
It is possible to shorten the work period and reduce the construction cost. In addition, an injection path connecting the exposed surface of the concrete block exposed to the outside after the construction of the embankment and the joint surface of the concrete block with which the adjacent concrete block is in contact when the concrete blocks are stacked is formed by the concrete passage. Formed inside the block, after the concrete blocks are stacked, a filler is injected into the injection path from the exposed surface side and discharged from the joint surface side of the injection path, and the discharged filler fills the concrete block. Since the gaps between the joining surfaces are filled, the work for securing the water stoppage and the water blocking of the embankment can be simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a dam embankment construction method of the present invention.

[Explanation of symbols]

 11, 12 Concrete block 11a, 12a Front surface (exposed surface) 11b, 12b Upper surface (joining surface) 11c, 12c Lower surface (joining surface) 23 Injection path 40 Aggregate T embankment

Claims (1)

(57) [Claims] 1. A method of preparing a large number of concrete blocks of a predetermined shape in advance, stacking the concrete blocks, constructing a surface wall of a dam embankment, filling an aggregate inside the constructed surface wall, by integrating said surface wall and the bone material to build embankment by solidifying the aggregate, and the exposed surface of the concrete block which is exposed to the outside after the construction of the dam body, adjacent when stacking the concrete blocks Forming an injection path connecting between the concrete block and the joint surface of the concrete block to be in contact with the concrete block, and injecting a filler into the injection path from the exposed surface side after stacking the concrete blocks. And the gap between the joint surfaces of the concrete blocks is discharged by the discharged filler. Was to fill, features and to holder arm embankment construction method that.