JPS62291308A - Construction work of concrete dam - Google Patents

Abstract

PURPOSE:To cut down the cost of machinery and facilities as well as to shorten the period of construction by a method in which, aggregate carried to a dam site is uniformly laid, cement is spread over the aggregate and mixed with the aggregate, and they are compacted. CONSTITUTION:Aggregate 27 is carried into a dam sits by dump truck, etc., and uniformly laid by bulldozer, and cement 28 is spread over the aggregate 27 by using a spreader 20 attached to the bulldozer 21 having a spreading hopper 22 on its back side. The aggregate 27 and the cement 28 are mixed together by using a stabilizer 23 with a breaker 25 on the front of a traveling vehicle 24 and then compacted by a vibro-roller. The separation of the cement 28 can thus be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION λ Detailed Description of the Invention Field of Industrial Application The present invention relates to a method of constructing a concrete dam.

Conventional technology The conventional construction method for this type of concrete dam is RC.
There is method D. This RCD construction method is a series of construction systems in which poorly mixed cemented carbide concrete is transported by dump trucks, etc., leveled with a bulldozer, joints created with a vibrating joint cutter, and then compacted with vibrating rollers to construct a concrete dam. It is.

The order of placing dam concrete using the RCD method is shown in Figures 1 and 7: concrete plant 1 -> packet 2 (bunker line) -> fixed cable crane 3 -> mobile hopper 4 -> dump truck 5 -> bulldozer. 6 → joint cutter 7 → vibrating roller 8 → motor sweeper 9 (green cut) → watering curing 10 → mortar leveling 11 → next layer pouring installation 2.

As mentioned above, the RC'D method is mainly used in concrete plants; aggregate and cement are mixed to make concrete. This is a construction method in which the concrete is transported by a dump truck or the like, leveled with a bulldozer b, and then compacted with a vibrating row 28 (see Figure 8).

Problems to be solved by the invention Compared to conventional block casting methods, etc., the RC'D construction method allows large-volume, rapid (continuous) construction using general large machinery.■ Because the amount of cement used is small, temperature rise is reduced. Cooling work can be omitted.

+I+ Since the joints are mechanically cut immediately after concrete is poured, there is no need for formwork work, and the overall evaluation including technical aspects has shown that it is effective. However, on the other hand, issues remain, such as shortening the construction period through improvements in cement mixing and management systems and efficient use of machinery.

In addition, in the RCD method, the mixed concrete is transported to the dam site and leveled, so separation of cement materials occurs when dumping from a dump truck or leveling by pulling.

Purpose of the Invention The present invention has been developed in view of the above-mentioned circumstances, and there is no separation of cement materials, no concrete plant is required, and the plant installation process and the concrete transportation process from the plant to the dam site can be eliminated. The purpose of the present invention is to provide a concrete dam construction method that can shorten the construction period and reduce the cost of machinery and equipment.

Means and action for solving the problem In order to achieve the above purpose, this plant spreads cement on the aggregate brought to the dam site after leveling it, and then mixes the aggregate and cement. Embodiment Embodiments of the present invention will be described below based on the drawings.
1. Concrete dam construction method according to the present invention (Stabi
Lizing RaLLar CmytpactatL
Dam construction method (5pcn construction method) is a method in which cement is blended and mixed directly at the dam site.

That is, as shown in Fig. 1, aggregate 27 is brought to the dam site by a dump truck or the like, and this aggregate 27 is moved to a bulldozer.
Then, cement 28 is applied to this leveled aggregate 27.
Spread. A spreader 20 shown in FIGS. 2 and 3 is used for this cement spreading. This spreader 20 has a structure in which a cement spreading hopper 22 is attached to the rear of a bulldozer 21.

Next, aggregate 27 and cement 28 are mixed.

A stabilizer 23 is used for this mixing.

This stabilizer 23 is connected to the traveling vehicle 2 as shown in FIG.
The breaker 25 is equipped with a breaker 25 on the front part of the aggregate 27, and this breaker 25 rotates a rotary body 26 that shoots a crushing bit 26a to crush the cement 2 scattered on the aggregate 27 as shown in FIG.
Next, the aggregate 27 mixed by the stabilizer 23 and 2 g of cement are compacted using a vibrating roller.

Effects of the Invention As detailed above, the method for constructing a concrete dam according to the present invention is to spread cement on the aggregate after leveling the aggregate carried to the dam site, and to mix the aggregate and cement. The percentage indicates that the material is compacted after mixing.

Therefore, it is inevitable that the cement material will separate because the cement is spread on the pre-leveled aggregate and then mixed.

In addition, since a concrete plant is not required, the plant installation process and the concrete transport process from the plant to the dam site can be eliminated, reducing the construction period.
Concrete plants and cable cranes are no longer required, and machinery and equipment costs can be reduced.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the concrete dam construction method according to the present invention, Figure 2 is a plan view of the scatterer T1, Figure 3 is a side view of the same, Figure 4 is a side view of the stabilizer, and Figure 5 is the breaker. Fig. 6 is an explanatory diagram of the order of placing dam concrete using the conventional concrete dam construction method, Fig. 7 is an explanatory diagram of the same concrete pouring, and Fig. 8 is an explanatory diagram of the conventional concrete dam construction method. be. 20 is a spreader, 21 is a bulldozer, 22 is a spreading hopper, 23 is a stabilizer, 25 is a breaker, 27 is aggregate, and 28 is cement. Figure 4 Figure 6

Claims (1)

[Claims] A method of constructing a concrete dam, which is characterized in that after leveling the aggregate carried to the dam site, cement is spread on the aggregate, and the aggregate and cement are mixed and then compacted.