JP7443207B2 - Concrete placement methods and concrete placement systems - Google Patents

Description

The present invention relates to a concrete placing method, a concrete placing system, a chute, etc. used therein.

When constructing a concrete structure in a body of water, the boom of a pump truck (also referred to as a concrete pump truck) is sometimes extended from a pier and concrete is poured in a concrete pouring range (for example, see Patent Document 1).

Japanese Patent Application Publication No. 2002-146811

However, in this case, the number of pump trucks installed is limited due to the large space occupied by pump trucks on the pier and the difficulty in securing a flow line for concrete supply mixer trucks (also called truck mixers or truck agitators). is limited. Therefore, in cases where concrete is to be poured over a wide area, a problem arises in which concrete cannot be poured efficiently.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a concrete pouring method etc. that can efficiently pour concrete.

A first invention for solving the above-mentioned problem is to construct a cofferdam wall in the ground of a water body so as to surround a concrete casting range, and to construct a cofferdam wall to surround the concrete casting range on the opposite side of the concrete casting range across the cofferdam wall. Each pier is provided on the side of a non-concrete area and is provided along the cofferdam wall at a distance from the cofferdam wall, each extending from the pier to the concrete area, and the middle part of the piers is connected to the cofferdam wall. A plurality of chutes fixed only at the upper end of the wall and arranged diagonally so as to descend from the pier toward the pouring range are arranged side by side in the longitudinal direction of the pier, and a mixer truck on the pier is arranged. This concrete placing method is characterized in that concrete is placed in the placing range using the plurality of chutes.

In the present invention, by using a chute that is fixed midway to the cofferdam wall and pouring concrete from the non-placing area to the pouring area, concrete can be poured simultaneously from multiple chutes even in narrow spaces such as piers. This makes it possible to place concrete efficiently.

Preferably, concrete is placed through a hopper provided below the end of the chute on the side of the casting range.
This makes it possible to suppress free fall of concrete.

A second invention provides a cofferdam wall formed to surround a concrete casting range on the ground of a water body , and a concrete non-placing range on the opposite side of the concrete casting range across the cofferdam wall, a pier provided along the cofferdam wall at a distance from the cofferdam wall; and a plurality of chutes for pouring concrete from a mixer truck on the pier into the pouring range , the chutes being arranged in the longitudinal direction of the piers. a plurality of chutes arranged side by side, each chute extending from the pier to the pouring range, a part thereof being fixed only at the upper end of the cofferdam wall, and each chute extending from the pier to the pouring range; This concrete placing system is characterized by being arranged diagonally downward toward the area .
The second invention is a concrete placing system used in the concrete placing method of the first invention.

ADVANTAGE OF THE INVENTION According to this invention, the concrete pouring method etc. which can pour concrete efficiently can be provided.

FIG. 1 is a diagram showing a concrete placement system 1. FIG. FIG. 1 is a diagram showing a concrete placement system 1. FIG. A diagram showing a chute 12. A diagram showing a fixture 15. A diagram illustrating a concrete placement method. An example of fixture 15a.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

(1. Concrete placement system 1)
FIG. 1 is a diagram showing a concrete placement system 1 according to an embodiment of the present invention. The concrete placing system 1 is for placing concrete from a mixer truck 2 on a pier 11, and includes, in addition to the pier 11, a coffering wall 10, a chute 12, a hopper 13, a pedestal 14, a fixture 15, and the like.

The closing wall 10 separates a concrete pouring area and a non-concrete pouring area. The shutoff wall 10 is constructed by driving steel pipe sheet piles 10a into the ground of the water area W. In this embodiment, as shown in plan in FIG. 2, a shutoff wall 10 is formed by arranging steel pipe sheet piles 10a so as to surround a concrete placement range A. Therefore, the inside of the cofferdam 10 becomes the concrete placement range A, and the outside of the cofferdam 10 becomes the non-concrete placement range.

The pier 11 is used for transporting materials, installing heavy machinery, etc. when driving the steel pipe sheet piles 10a. The pier 11 is provided on the outside of the closing wall 10 (on the non-concrete pouring area side) with a space therebetween. In this embodiment, the pier 11 is used as a platform during concrete pouring, and the mixer truck 2 runs on the pier 11. The width of the pier 11 is, for example, a width that allows a plurality of mixer trucks 2 to travel. The pier 11 is supported by support piles 111 driven into the ground, and a handrail (not shown) is also provided on its upper surface.

The chute 12 is a channel for pouring concrete from the top of the pier 11 into a pouring range A inside the cofferdam 10. The chute 12 extends from the pier 11 to the concrete placement range A, and is fixed to the cofferdam 10 in the middle. The chute 12 is fixed from below by a fixture 15 only at the closing wall 10, and is arranged diagonally so as to descend from the pier 11 toward the concrete placement range A.

FIG. 3 is a diagram showing the chute 12. 3(a) is a side view of the chute 12, and FIGS. 3(b) and 3(c) are radial directions of the chute 12 taken along line aa and line bb in FIG. 3(a), respectively. FIG. 3 is a diagram showing a cross section.

As shown in FIG. 3, the chute 12 is a cylindrical member, and in this embodiment, a highly rigid steel pipe is used.

In the chute 12, an end 121 on the concrete casting range A side (corresponding to the left side in FIG. 3(a)) is cut out diagonally. On the other hand, at the end 123 on the pier 11 side (the non-concrete pouring area side, corresponding to the right side in FIG. 3(a)), the upper half of the steel pipe is cut out as shown in FIG. 3(c). Additionally, vanes 124 are provided that extend from the lower half of the steel pipe to both sides, making it easy to receive concrete from the mixer truck 2.

FIG. 4(a) is a diagram showing the fixture 15 of the chute 12. The fixture 15 is for fixing the cylindrical chute 12 to the receiving portion 152 by holding it from above using a U-shaped bolt 154. A plurality of U-shaped bolts 154 (two in the illustrated example) are provided along the longitudinal direction of the chute 12, and both ends of each U-shaped bolt 154 are fastened to the receiving portion 152 with nuts or the like. The chute 12 is fixed at multiple locations by these multiple U-shaped bolts 154.

A crossbeam 151 is provided below the receiving portion 152. The cross beam 151 is a girder-shaped member placed on the steel pipe sheet pile 10a, and extends in a direction perpendicular to the longitudinal direction of the chute 12 in a plane (corresponding to the direction normal to the plane of the paper in FIG. 4(a)). Placed. In this embodiment, a pair of cross beams 151 are provided at the front and rear of the chute 12 in the longitudinal direction.

FIG. 4(b) is a top view of the arrangement of the cross beam 151 and the receiving portion 152. In this embodiment, the pair of cross beams 151 are arranged in parallel so as to bridge between the edges of the steel pipe sheet piles 10a. Further, the receiving portion 152 is formed by combining steel materials in a square shape.

The receiving part 152 is arranged on the crossbeam 151, and as shown in FIG. 4(a), the end of the receiving part 152 on the rear side (pier 11 side, corresponding to the right side in FIG. 4(a)) is arranged on the rear crossbeam 151 via a height adjusting member 153. Thereby, the receiving portion 152 is arranged diagonally in accordance with the inclination of the chute 12. The height of the height adjusting member 153 is determined according to the slope of the chute 12, and by changing the height of the height adjusting member 153, various slopes can be accommodated.

Legs 155 are provided on the lower surface of the crossbeam 151 to be inserted into the steel pipe sheet pile 10a. A total of four legs 155 are arranged at both ends of each cross beam 151, and each leg 155 is arranged so as to be in contact with the inner surface of the steel pipe sheet pile 10a, as shown in FIG. 4(c). This prevents the fixture 15 from coming off the steel pipe sheet pile 10a.

As shown in FIG. 1, a hopper 13 is provided below the end of the chute 12 on the casting range A side. The hopper 13 has a plurality of cone-shaped guide tubes 132 provided above and below a funnel-shaped hopper main body 131 in multiple stages, thereby suppressing free fall of concrete.

The pedestal 14 supports the hopper 13, is formed by combining steel materials, and is erected on the ground in the concrete placement range A. A scaffold board or the like is also provided on the upper surface of the pedestal 14.

As shown in FIG. 2, multiple sets of chutes 12, hoppers 13, frames 14, etc. are provided along the cofferdam 10, and in this embodiment, concrete can be placed simultaneously using multiple chutes 12. .

(2. Concrete placement method)
Next, a concrete placing method using the concrete placing system 1 will be explained.

In this embodiment, first, a pier 11 is constructed in a water body W, and a shutoff wall 10 is constructed by driving steel pipe sheet piles 10a into the ground using heavy equipment on the pier 11. Then, the concrete casting range A inside the cofferdam 10 is drained, and the chute 12, hopper 13, pedestal 14, etc. are installed as shown in FIG.

Thereafter, concrete is poured into the pouring range A from the mixer truck 2 on the pier 11 using the chute 12. At this time, the concrete supplied from the mixer truck 2 flows through the chute 12, exits from the end of the chute 12 on the pouring range A side, and descends within the hopper 13. For example, high fluidity concrete is used as the concrete, but the concrete is not limited to this.

Concrete is placed in several batches, and as the top of the concrete 100 rises, the guide pipe 132 of the hopper 13 is sequentially removed from the bottom, as shown in FIG. 5(a). FIG. 5(b) shows a state in which concrete 100 has been poured, and although the hopper main body 131 is also removed eventually, the pedestal 14 remains and is buried in the concrete 100.

As explained above, in this embodiment, by using the chute 12 that is partially fixed to the cofferdam 10 and pouring the concrete 100 into the pouring range A from the pier 11 side, even in a narrow space such as the pier 11. , it becomes possible to simultaneously place the concrete 100 from a plurality of chutes 12, and the concrete 100 can be placed efficiently.

Furthermore, by using a highly rigid steel pipe for the chute 12 and fixing the chute 12 only at the closing wall 10, the chute 12 can be easily installed and the effort required for installation can be reduced.

Moreover, in this embodiment, by using the chute 12 extending from the pier 11 to the pouring range A, concrete 100 is It is possible to suitably carry out the pouring work.

Further, by using the hopper 13 described above for pouring the concrete 100, free fall of the concrete 100 can be suppressed.

However, the present invention is not limited to the above embodiments. For example, in this embodiment, an example has been described in which the steel pipe sheet pile 10a is cast in the water area W to construct the cofferdam wall 10, and concrete 100 is cast inside thereof, but the present invention is not limited to this. It is also possible to use Furthermore, the present invention can also be applied to the case where concrete is poured from a gantry such as a pier to the inside of a cofferdam such as formwork, steel sheet piles, steel pipe sheet piles, and earth retaining walls during ground construction.

Furthermore, the fixture 15 is not limited to the above-described configuration, and may be of any type as long as it can secure the chute 12. For example, like the fixture 15a in FIG. 6, a plurality of stands 156 (receptors) of different heights (two in the example of FIG. 6) are attached to the chute 12 on a lid 157 that fits into the opening of the steel pipe sheet pile 10a. It is also possible to adopt a configuration in which U-shaped bolts 154 are provided at the front and rear in the longitudinal direction, and both ends of a U-shaped bolt 154 that encloses the cylindrical chute 12 from above are fastened to each stand 156 with nuts or the like. In addition, the configuration of the chute 12 is not limited to that described with reference to FIG. 4 and the like.

It is also possible to use the concrete placing method using the chute 12 and concrete placing by extending the boom from the pump truck. For example, by extending the boom from the pump truck to the vicinity of the center of the pouring range A. Concrete 100 can be placed. In this case, the position of the pump truck is determined in consideration of the flow line of the mixer truck 2, etc., but since the chute 12 is used for pouring, the number of pump trucks can be small.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that those skilled in the art can come up with various changes or modifications within the scope of the technical idea disclosed in this application, and these naturally fall within the technical scope of the present invention. Understood.

1: Concrete placement system 10: Closure wall 10a: Steel pipe sheet pile 11: Pier 12: Chute 13: Hopper 14: Frame 15, 15a: Fixture 100: Concrete

Claims (3)

Construct a cofferdam wall to surround the area where concrete will be placed on the ground in the water area ,
A pier provided on the side of a non-concrete pouring area opposite to the pouring area across the cofferdam, and provided along the cofferdam at a distance from the cofferdam, respectively. a plurality of chutes that extend from the pier to the pouring range, are fixed only at the upper end of the closing wall in the middle, and are arranged diagonally so as to descend from the pier toward the pouring range; are arranged side by side in the longitudinal direction of the pier,
A method for placing concrete, comprising placing concrete in the placing range from a mixer truck on the pier using the plurality of chutes. 2. The concrete pouring method according to claim 1 , wherein concrete is poured through a hopper provided below an end of the chute on the side of the pouring range. A cofferdam wall formed to surround the concrete placement area on the ground of a water body ;
a pier provided along the closing wall at a distance from the closing wall on the side of the non-concrete pouring area opposite to the pouring area across the closing wall;
a plurality of chutes for pouring concrete from a mixer truck on the pier in the pouring range , the plurality of chutes being arranged side by side in the longitudinal direction of the pier;
Each chute extends from the pier to the pouring range, is fixed only at the upper end of the closing wall, and is arranged diagonally so as to descend from the pier toward the pouring range. ,
A concrete pouring system characterized by:

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