JP2527310B2 - Manufacturing method of concrete structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a concrete structure for constructing a concrete structure such as a caisson on a work table ship.

(Prior Art) When constructing a concrete structure such as a caisson used as a breakwater near a quay, as shown in FIG. 3, the mound M ″ is previously formed on the water bottom BW with rubble or sand.
To create. Then, the work platform D having the floor plate 4 and the top plate 6 is set on the bottom of the mound M ″.

Then, with the top plate 6 of the work pontoon D positioned above the water surface, the concrete structure C is built on the floor plate 4 of the work pontoon D to a height at which it can sufficiently float by itself.

Then, float the work pontoon D on the water surface,
The concrete structure C is towed to a predetermined position via. Then, the work pontoon D is sunk below the surface of the water, the concrete structure C is separated from the floor plate 4 of the work pontoon D, and the concrete structure C is independently floated on the water surface and taken out from the work pontoon D.

Next, water is poured into the concrete structure C, and the concrete structure C is submerged at a predetermined position on the water bottom and installed.

In addition, in FIG. 3, reference numeral G indicates a quay, and m indicates a slope of the mound.

(Problems to be Solved by the Invention) However, in the above-described conventional technique, the mound M ″ for bottoming the work platform ship is constructed by solidifying soil, sand or the like on the water bottom BW near the manufacturing yard of the quay G. Therefore, there were the following problems.

It takes time to level the soil in the water, and it takes a long time to build the mound.

You cannot easily increase or decrease the area of the mound. That is, in order to increase the area of the mound, it is necessary to newly fill it with earth and sand and level it to solidify it, and to reduce the area of the mound, excavate and remove the surplus portion. In any case, the work is complicated.

Sediment is constantly eroded by the flow of seawater. In order to prevent this, it is necessary to install blocks for erosion prevention on the slope m and shoulders of the mound M ″, which makes maintenance of the mound difficult.

When removing the mound, it is necessary to remove the soil and sand that is piled up on the water bottom BW and hardened, and it is not easy because it is an underwater operation, and it is not easy to treat water pollution and manage the soil discharge site. Therefore, it is extremely difficult to remove the mound.

When building a mound in deep water, the amount of earth and sand that heaps up increases and the skirts also spread, so it takes a lot of time and money to build the mound.

The present invention has been proposed in view of the above points, and its purpose is to build a mound for a work pontoon in a place where the water depth is deep, in a short time, and It is an object of the present invention to provide a method for producing a concrete structure which can be constructed at a low construction cost and which can easily perform the increase / decrease in the area of the mound, maintenance and removal work.

(Means for Solving the Problem) In order to achieve the above object, in the present invention, a plurality of concrete blocks or blocks obtained by solidifying earth and sand in segments or floating blocks 2 are installed at predetermined intervals on the water bottom BW, A girder material 3 in which steel materials 3a and 3b are assembled and connected in a grid shape is arranged on the row of the block 2, the girder material 3 is fixed to the row of the block 2, and a mound M is built in water. A floating work platform D is mounted on the mound M, and a concrete structure C is manufactured on the work platform D.

In order to achieve the above-mentioned object, according to the present invention, a predetermined number of blocks 2 arranged at a predetermined interval in advance, and the unit blocks 2 are assembled in a grid on a row and fixed on the blocks 2. And the unit girder material 3 composed of the steel materials 3a and 3b are combined into one unit a to form a plurality of units a.
Are connected to build the mound M.

Furthermore, in order to achieve the above-mentioned object, the water bottom BW
, A plurality of piles 2'is driven, adjacent piles 2 ', 2'are fixed by bracing 2 ", and a girder 3' made up of steel material is assembled on the row of the piles 2 '. It is placed and connected to the stake 2 ′ to build a mound M ′ in water, and a floating work platform D is mounted on the mound M ′, and a concrete structure C is mounted on the work platform D. I am trying to produce.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the first aspect of the present invention, in which FIG. 1 (a) is a partially cutaway plan view, and FIG. 1 (b) is a partially longitudinal side view. .

In the first embodiment shown in FIG. 1, sand, rubble stones 1 and the like are spread on the bottom BW of the water, and a mound M for a work pontoon is built on it.

The mound M is constructed by a plurality of blocks 2 and girder members 3 assembled in a grid pattern.

The block 2 may be either a concrete block or a block obtained by solidifying earth and sand with cement.
Further, a concrete (or / and steel) hollow block is used as the block 2, and a pump (not shown) is used.
It is also possible to use a so-called floating / sinking block, which is capable of being poured and drained into the inside of the block through the to make it float and sink. The plurality of blocks 2 are laid on sand, rubble stones 1 and the like, and placed at predetermined intervals.

The girder material 3 is formed by assembling steel materials 3a and 3b in a grid pattern. For example, H-shaped steel is used for the steel materials 3a and 3b.
Then, the steel material 3a is arranged and fixed at the central portion of the upper surface of each block 2, and the steel material 3b is arranged in a direction orthogonal to the row of the steel material 3a.
Are arranged and connected.

In this way, the girder material 3 in which a plurality of steel materials 3a and steel materials 3b are assembled and connected in a grid pattern is arranged on the row of the block 2, and the girder material 3 is fixed on the row of the block 2 and submerged in water. Build Mound M.

Further, in the second embodiment, for example, two blocks 2 each in the vertical and horizontal directions and the unit girder member 3 fixed on the row of the unit blocks 2 are combined into one unit a. The unit girder member 3 is composed of a steel material 3b and a steel material 3a assembled in a grid pattern, arranged on the unit block 2, and fixed. Then, a plurality of units a are connected to build the mound M.

The work platform ship D is placed on the mound M built as described above. This work pontoon D has a floor board 4 and a float 5 on the side.
And is configured to be freely floatable.

On the work pontoon D, a concrete structure C such as a caisson is manufactured by a usual method.

The concrete structure C is manufactured to such a height that it can float by itself when water is poured onto the work platform ship D.

After the concrete structure C is manufactured to a predetermined height, the work pontoon D is floated on the water surface and towed to a predetermined position. Then, the work pontoon D is submerged below the water surface, the concrete structure C is separated from the work pontoon D, floated, and taken out from the work pontoon D. Then, water is poured into the concrete structure C to sink the concrete structure C, and the concrete structure C is installed at a predetermined position on the water bottom.

As described above, in the first embodiment, the plurality of blocks 2 are installed on the water bottom BW at a predetermined interval, and the steel materials 3b and 3a are assembled and connected on the rows of the blocks 2 in a grid pattern. The girder members 3 configured as described above are arranged, and the girder members 3 are fixed to the rows of the blocks 2 to build the mound M.

Therefore, in the first embodiment, it is sufficient to lay sand or rubble stones 1 thinly on the bottom BW, and it is not necessary to lay it in water for a long time, so even if the mound M is deep in a deep water place. Even in the case of building, the mound M can be built in a short time and at a low construction cost.

Further, in order to increase or decrease the area of the mound M, it is sufficient to increase or decrease the number of blocks 2 to be installed, and add or remove the grid-shaped girder members 3 on the rows of the blocks 2,
Since it is not necessary to newly fill the mound to expand the mound or to cut the mound built by the embankment, the area of the mound M can be easily increased or decreased.

Further, since the block 2 of the mound M is hardly washed with water and is not eroded by the water flow, the mound M can be easily maintained and managed.

Moreover, when removing Mound M, block 2
It is only necessary to remove the girder material 3 from the top of the row and pull up the block 2, and there is no need to remove the solidified sand and the like that have been piled up on the water bottom BW and solidified in water. It is also possible to omit the pollution treatment.

Further, as shown in FIG. 1A by being surrounded by imaginary lines, a predetermined number of blocks 2 and unit beam members 3 fixed in a grid on the rows of the unit blocks 2 are combined. The mound M can be constructed in a shorter time and at a low construction cost by combining the plurality of units a into one unit a and connecting the plurality of units a to each other. Can be performed in an even shorter time.

Next, FIG. 2 shows an embodiment of the second invention of the present invention. FIG. 2 (A) is a partially cutaway plan view, and FIG. 2 (B) is a partially longitudinal side view. is there.

In the embodiment shown in FIG. 2, a mound M'is constructed by a plurality of piles 2'and a girder member 3'assembled in a grid pattern.

The pile 2'is made of steel and has a columnar shape. A plurality of these piles 2'are driven into the water bottom BW, respectively, and are erected at predetermined intervals. And adjacent piles 2 ',
Fix 2'with braces 2 ".

Then, the girder material 3'is placed on the row of the piles 2'and fixed to the piles 2 '. This girder material 3'is also made by assembling steel materials vertically and horizontally to form a lattice.

The other structure of this embodiment is the same as that of the first embodiment of the first invention.

In this embodiment, since a plurality of piles 2'is driven into the water bottom BW to build the mound M ', there is no need to spread sand or rubble 1 etc. on the water bottom BW to level the mound. Can be done even less underwater. Further, since the piles 2'are struck and constructed, the stability is good, and the installation position of the mound M'will not be displaced even in a state where a large wave is generated due to a typhoon or the like and water flows violently. Therefore, the mound M ′ can be more easily maintained and managed.

Other functions of this embodiment are similar to those of the first embodiment of the present invention.

(Effect of the invention) As described above, in the first invention described in the first aspect of the present invention, a plurality of blocks 2 are installed on the water bottom BW at predetermined intervals, and Since the girder material 3 constructed by assembling and connecting the steel materials 3a and 3b in a lattice shape is arranged on the row, and the girder material 3 is fixed to the row of the block 2 to build the mound M. , It is enough to lay sand or rubble 1 thinly on the bottom of the water BW, and it is not necessary to lay it in water for a long time, so even if the mound M is built in a deep water place. , That mound M
There is an effect that can be built in a short time and at a low construction cost. Further, according to the present invention, in order to increase or decrease the area of the mound M, it suffices to increase or decrease the number of blocks 2 to be installed and add or remove the grid-shaped girder members 3 on the rows of the blocks 2. Since there is no need to fill the ground to expand the mound or cut the mound built to fill, the area of the mound M can be easily increased or decreased. Furthermore, according to the invention, block 2 of mound M
Is almost never washed away with water, and is not eroded by the flow of water, so there is an effect that the maintenance of the mound M can be easily performed. When removing the mound M, the row of block 2 It suffices to remove the girder material 3 from the top and pull up the block 2, and it is not necessary to remove the solidified sand and the like that has been piled up on the bottom BW of the water and solidified in water, so that the removal work can be easily performed. There is also an effect that the pollution treatment can be omitted.

Further, a unit composed of a predetermined number of blocks 2 arranged at a predetermined interval in advance and steel materials 3a, 3b assembled in a grid on the row of the unit blocks 2 and fixed on the block 2. Since the girder member 3 and the girder member 3 are integrated into one unit a and a plurality of units a are connected to construct the mound M, the mound M can be constructed in a shorter time and at a low construction cost. There is a mound M
There is also an effect that the area can be increased or decreased and the removal work can be performed in a shorter time.

Further, in the second invention according to the third aspect of the present invention, a plurality of piles 2'is placed on the water bottom BW, and adjacent piles 2 ', 2'are fixed by bracing 2 ", On the row of the piles 2 ', a girder material 3', which is a steel material assembled in a grid pattern, is placed and connected to the piles 2'to build a mound M'in the water. There is no need to lay sand or rubble stones evenly, and there is an effect that the work underwater to build the mound can be further reduced, and because the pile 2'is driven in and built, stability is good, For example, even if a large wave is generated due to a typhoon or the like, and the water flows violently, the installation position of the mound M ′ does not shift, and therefore the mound M ′ can be maintained and managed more easily.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the first invention of the present invention.
The same figure (a) is a partially cutaway plan view, and the same figure (b).
FIG. 3 is a partially longitudinal side view. FIG. 2 shows an embodiment of the second invention of the present invention. FIG. 2 (A) is a partially cutaway plan view, and FIG. 2 (B) is a partially longitudinal side view. FIG. 3 is a partially longitudinal side view showing a conventional technique. BW: bottom of the water, M: mound for work platform, 2 ... blocks that make up the mound, 3 ... girders that make up the mound, 3a, 3b ... make up girders Steel, a
…… Units that make up the mound, D …… table carrier, C …… concrete structure, M ′ …… mound,
2 '... Piles that make up the mound, 2 "... Brace that fixes adjacent piles, 3' ... Girder material that makes up the mound.

Claims (3)

(57) [Claims] 1. A plurality of concrete blocks or blocks in which earth and sand are solidified by segments or floating / sink blocks 2 are installed at a predetermined interval on a water bottom BW, and steel materials 3a, 3b are arranged on the rows of the blocks 2 in a grid pattern. The girders 3 assembled and connected in a shape are arranged, the girders 3 are fixed to the row of the block 2, the mound M is built in water, and the floating work platform D is mounted on the mound M. A concrete structure C is manufactured on the work pontoon D. A method for manufacturing a concrete structure, comprising: 2. A predetermined number of blocks 2 arranged at predetermined intervals in advance, and steel members 3a, 3b assembled on the row of the unit blocks 2 in a grid pattern and fixed on the blocks 2. 2. The concrete structure according to claim 1, characterized in that the unit girders 3 thus constructed are combined into one unit a and a plurality of units a are connected to build the mound M. Method. 3. A plurality of piles 2 ′ are driven on the water bottom BW, and adjacent piles 2 ′, 2 ′ are fixed by bracing 2 ″, and a steel material is arranged in a grid on the row of the piles 2 ′. The assembled girder material 3'is placed and connected to the pile 2'to construct a mound M'in the water, and a floating work platform D is mounted on the mound M ', and the work platform D A concrete structure C is manufactured as described above.