JPH11269853A - Construction method of concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a time for infiltration of highly fluidal concrete and to firmly combine large particle sized crushed stone with the highly fluidal concrete. SOLUTION: After large particle sized crushed stone 2 as aggregate is charged to the inside formed by a concrete outer frame 1, highly fluidal concrete 3 is placed to the inside of the outer frame 1. Casting of the concrete 3 is made from above of the outer frame 1, or it can be made from below the outer frame 1 through a concrete casting pipe by piping the concrete casting pipe inside the outer frame 1 in the case the large particle sized crushed stone 2 is charged. After the concrete 3 is placed inside the outer frame 1 to be formd, in such a way as the large particle sized crushed stone 2 is charged, the order in the casting of the concrete 3 and the charge of the large particle sized crushed stone 2 can be changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for constructing a concrete dam and other concrete structures.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 8-177,035 discloses a process of forming an outer frame made of concrete as an outer shape of a bank, and a method of putting soil generated on site into the outer frame and compacting the soil. The step of forming the soil layer and the step of impregnating the generated soil layer with high-fluidity concrete to form a sedimentary layer are defined as one cycle, and by repeating the one cycle, the sleeve portion of the sabo dam having a predetermined height is obtained. Are disclosed.

[0003]

However, in the above-mentioned conventional method, since the high-fluidity concrete penetrates into the compacted soil layer, it takes a long time to penetrate the high-fluidity concrete, and the generated soil and There is a problem that it is difficult to obtain a strong bond with high-fluidity concrete.

[0004] Therefore, the present invention utilizes large-sized crushed stone as an aggregate to shorten the permeation time of highly fluid concrete,
An object of the present invention is to provide a method for constructing a concrete structure capable of obtaining a strong bond between a large-sized crushed stone and high-fluidity concrete.

[0005]

According to the first aspect of the present invention, a concrete outer frame is formed, and a large particle size crushed stone as an aggregate is introduced into the outer frame. It is characterized in that concrete is poured into the outer frame from above. According to the second aspect of the present invention, a concrete outer frame is formed, a concrete casting pipe is piped into the outer frame, and a large-grained crushed stone as an aggregate is poured. It is characterized in that high-fluidity concrete is poured into the outer frame from below through a pipe for use. The invention according to claim 3 is characterized in that a concrete outer frame is formed, high-fluidity concrete is poured into the inside of the outer frame, and then large-sized crushed stone as an aggregate is charged. I have.

[0006]

1 and 2 show a first embodiment, FIG. 1 shows a process of constructing a concrete dam as a concrete structure, and FIG. 2 shows a high fluidity concrete 3 cast therein. 3 shows a side view of the state.

Referring to FIG. 1, in the first embodiment, first, as shown in step 101, a concrete outer frame 1 as an outer shape of a bank is formed in multiple layers. Outer frame 1 is
By casting external compound concrete using a mold (not shown), it is formed in a hollow shape having an opening at a predetermined height. The outer frame 1 bears, in the solidified state after curing, large crushed stone 2 shown in step 102 which is put into the outer frame 1 and high fluidity concrete 3 shown in step 103 which is cast thereafter. The strength and thickness are determined to be sufficient.

Next, as shown in step 102, large crushed stone 2 as an aggregate is placed inside the outer frame 1 after curing.
Into the vicinity of the top. The large crushed stone 2 is used by selecting crushed stone having a particle diameter of 150 mm or more, for example, from earth and sand generated on site. And the sorted large crushed stone 2
Similar to the construction of the rock fill dam, it is scattered and spread inside the outer frame 1 using a large heavy machine (not shown).

Thereafter, as shown in step 103, a highly fluid concrete 3 in which cement, sand and water are kneaded into a slurry having good fluidity is poured into the outer frame 1 from above. The high-fluidity concrete 3 is cast using a concrete bucket, a concrete chute, a concrete pump, or the like (not shown), so that the concrete 3 is located above the bottom of the outer frame 1 through the gap between the large crushed stones 2. Is gradually filled. When the outer frame 1 is filled to the vicinity of the top end, the pouring of the highly fluid concrete 3 is stopped. As the high-fluidity concrete 3 is solidified after the curing period, the outer frame 1, the large-diameter crushed stone 2 and the high-fluidity concrete 3 are integrated into a concrete dam having a predetermined height. Thereafter, if necessary, finishing is performed.

According to the method of the first embodiment, since the large crushed stone 2 is used as the aggregate, each large crushed stone 2
Are formed, and these gaps are irregularly continuous vertically and horizontally within the outer frame 1. Therefore, as shown in FIG.
Can evenly penetrate into the gaps between each other in a short time. In addition, the infiltrated high-fluidity concrete 3 is solidified so as to wrap each of the large-sized crushed stones 2, and the large-sized crushed stones 2 can be strongly bonded.

FIGS. 3 and 4 show a second embodiment, FIG. 3 shows a step of constructing a concrete dam, and FIG. 4 shows a side view of a state where the highly fluid concrete 3 has been poured.

In FIG. 3, in the second embodiment, first, as shown in step 201 similar to step 101 in FIG. An outer frame 1 made of concrete with an opening at an upper portion of the height is formed in a multilayer.

Next, as shown in step 202, a concrete casting pipe 4 such as a concrete feed pipe is laid on the inner bottom of the outer frame 1 after curing, and then the large-sized crushed stone 2 is formed on the outer frame 1. Spread out inside and spread.

Thereafter, as shown in step 203, a concrete pump (not shown) is connected to one end of the concrete placing pipe 4, and the high-flowable concrete 3 is pumped from the concrete pump to the concrete placing pipe 4.
Thereby, as shown in FIG. 4, the high-fluidity concrete 3 is cast from below into the outer frame 1 through a plurality of discharge ports 4 a provided on the peripheral wall of the concrete casting pipe 4. Then, the high-fluidity concrete 3 is made of each large-sized crushed stone 2
When the filler is gradually filled above the bottom of the outer frame 1 through the gap between the two and reaches near the top end of the outer frame 1, the pouring of the highly fluid concrete 3 is stopped. As the high-fluidity concrete 3 is solidified after the curing period, the outer frame 1, the large-diameter crushed stone 2 and the high-fluidity concrete 3 are integrated into a concrete dam having a predetermined height. Thereafter, if necessary, finishing is performed.

According to the method of the second embodiment, the outer frame 1
Of high-fluidity concrete 3 in the gaps between the large-size crushed stones 2 by forming concrete, laying pipes for concrete casting pipes 4 and feeding large-sized crushed stones 2, and placing the high-flowable concrete 3 from below. It can permeate uniformly in a short time, solidify the high-fluidity concrete 3 so as to wrap each of the large-sized crushed stones 2, and can firmly bind each large-sized crushed stone 2.

In the second embodiment, as shown in FIG. 4, the concrete casting pipe 4 is arranged in contact with the inner bottom of the outer frame 1, but the concrete casting pipe 4 is connected to the inner bottom of the outer frame 1. The piping may be further apart.

FIG. 5 shows a process of constructing a concrete dam according to the third embodiment. In the third embodiment, first, as shown in Step 301 similar to Step 101 in FIG. 1, an upper portion of a predetermined height is opened by pouring external compound concrete using a formwork not shown. The outer frame 1 made of concrete is formed in multiple layers.

Next, as shown in step 302, the highly fluid concrete 3 is poured into the outer frame 1 after curing from above the outer frame 1 using a concrete bucket, concrete chute, concrete pump or the like (not shown). Set up.
Even if the large-diameter crushed stone 2 shown in step 303 is subsequently introduced, the liquid level of the high-fluidity concrete 3 reaches near the top end of the outer frame 1,
The amount is set so that the high fluidity concrete 3 does not overflow from the outer frame 1.

Thereafter, as shown in step 303, the large crushed stone 2 is poured into the slurry of the high fluidity concrete 3 inside the outer frame 1 from above, and the large crushed stone 2 Spread near the edge. As the high-fluidity concrete 3 is solidified after the curing period, the outer frame 1, the large-diameter crushed stone 2 and the high-fluidity concrete 3 are integrated into a concrete dam having a predetermined height. Thereafter, if necessary, finishing is performed.

According to the method of the third embodiment, the outer frame 1
Formation, casting of high-fluidity concrete 3, large-sized crushed stone 2
, The high-fluidity concrete 3 penetrates uniformly into the gaps between the large crushed stones 2 in a short time, and the high-fluidity concrete 3 solidifies so as to wrap the large crushed stones 2 individually. The large crushed stone 2 can be firmly bonded.

As in each of the above embodiments, the outer frame 1 was pre-constructed in multiple layers using external compounding concrete, so that the formwork for forming the outer frame 1 is made of a large grain crushed stone 2 or a highly fluid concrete 3. And the height of the outer frame 1 to be pre-constructed can be increased without increasing the strength of the formwork. Further, if the large-sized crushed stone 2 is selected from the generated soil on the site and used, the time and labor required for the selection are increased, but the amount of waste generated in other places can be reduced.

Further, in each of the above embodiments, if the pipe cooling is provided inside the outer frame 1 before the high-fluidity concrete 3 is poured, the height of the high-fluidity concrete 3 per cast can be reduced. The height can be made higher than the conventional general casting height.

In each of the above embodiments, if a lining plate is laid on the large crushed crushed stone 2, heavy equipment can travel.

In each of the above embodiments, large-sized crushed stones 2 and high-fluidity concrete 3 are poured into the outer frame 1 which has been pre-constructed in multiple layers. The charging of the crushed stone 2 and the placing of the high-fluidity concrete 3 may be regarded as one cycle, and a concrete dam having a predetermined height may be formed by repeating the one cycle.

In each of the above embodiments, concrete dams are exemplified as concrete structures. However, large-scale mass concrete other than concrete dams, concrete pavement,
It can also be applied to the construction of concrete structures such as large foundations.

In each of the above embodiments, if a PC form is used as the form when the outer frame 1 is made, the work of diverting the form can be omitted.

In each of the above-described embodiments, as a part of the sand used for the high-fluidity concrete 3, for example, those having a fine particle content of 5 mm or less, which is a fine particle of muddy water discharged from an on-site aggregate manufacturing plant, may be selected and used. . The used amount is, for example, about 5% of the used amount of the high fluidity concrete 3.

[0028]

As described above, according to the first aspect of the present invention, after large-sized crushed stone is poured into a concrete outer frame, high-fluidity concrete is poured into the outer frame from above. By using large crushed stone as the aggregate, the highly fluid concrete passes through the gap between large crushed stones that are irregularly continuous vertically and horizontally within the outer frame from the bottom of the outer frame. It is poured so that it rises upward, so that high-fluidity concrete can permeate into the gaps between the large-diameter particles uniformly in a short time. In addition, the infiltrated high-fluidity concrete is solidified so as to wrap each of the large-sized crushed stones, so that the large-sized crushed stones can be strongly bonded. According to the second aspect of the present invention, after the concrete casting pipe is piped into the concrete outer frame and the large-sized crushed stone is charged, the high-flowable concrete is put through the concrete casting pipe. The time required for the highly fluid concrete to reach the bottom of the outer frame through the gaps between large-sized crushed stones that are irregularly continuous vertically and horizontally inside the outer frame It is poured so that it rises upward from below, and high-fluidity concrete penetrates into the gaps between large crushed stones evenly,
The large-sized crushed stones are solidified so as to wrap them individually, and the large-sized crushed stones can be strongly bonded. According to the third aspect of the present invention, the high fluidity concrete is poured into the inside of the outer frame made of concrete, and then the crushed stone having a large particle diameter is charged. The fluidized concrete penetrates all the gaps between the large-sized crushed stones and solidifies so as to wrap each of the large-sized crushed stones, so that each large-sized crushed stone can be firmly bonded.

[Brief description of the drawings]

FIG. 1 is a process chart of a first embodiment of the present invention.

FIG. 2 is a side view in which the high-fluidity concrete of the first embodiment is cast.

FIG. 3 is a process drawing of a second embodiment of the present invention.

FIG. 4 is a side view in which the high-fluidity concrete of the second embodiment is cast.

FIG. 5 is a process chart of a third embodiment of the invention.

[Explanation of symbols]

 Reference Signs List 1 outer frame 2 large grain size crushed stone 3 high fluidity concrete 4 concrete casting pipe

Claims (3)

[Claims] 1. A concrete characterized in that after a large-sized crushed stone as an aggregate is poured into the inside formed by a concrete outer frame, high-fluidity concrete is poured into the outer frame from above. Construction method of the structure. 2. A concrete casting pipe is piped into an interior formed by a concrete outer frame, and a large particle size crushed stone as an aggregate is charged. Then, the highly fluid concrete is passed through the concrete casting pipe. A concrete structure, characterized in that a concrete structure is poured into the outer frame from below. 3. A high-fluidity concrete is poured into an interior formed by a concrete outer frame, and then a large-size crushed stone as an aggregate is poured into the high-fluidity concrete. Construction method of concrete structure.