JP2691830B2 - How to build a double wall structure - 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 double wall structure using a steel sheet pile.

[0002]

2. Description of the Related Art Conventionally, a structure which is constructed by forming two wall surfaces facing each other, packing the earth and sand between both wall surfaces, and compacting them is called a double wall structure. It is suitable to be applied to the case of constructing. As one of the conventional construction methods for constructing this kind of double wall structure, as shown in FIG.
Steel sheet pile segment 1 which is obtained by cutting steel sheet piles into appropriate lengths at respective positions where two wall surfaces are to be formed and segmenting them.
Are connected to each other at the side ends (joining claws) so that the steel sheet pile segments 1 that are adjacent in the lateral direction are in a longitudinally offset positional relationship with each other, and then the same steps are repeated sequentially in the upper stage. A plurality of vertically oriented steel sheet pile segments 1 are arranged in the vertical direction and connected in the horizontal direction to form a steel sheet pile segment wall surface 2, and two opposing steel sheet pile segment wall surfaces are formed at an appropriate stage in the above process. Two
A construction method is known in which the two are connected by a tie member 3, the sand and sand sheet wall surfaces 2 and 2 are filled with earth and sand, and the earth and sand are then compacted (Japanese Patent Laid-Open No. 62-1373).
(See No. 11). In this case, the steel sheet pile segment wall surfaces 2, 2
For the filling work and the compaction work during the interval, the steel sheet pile segments 1 are arranged in every other vertical column and the steel sheet pile is increased every time the wall height is increased by half the length of the steel sheet pile segment 1. One half of the length of segment 1 is filled with earth and sand and compacted.

[0003]

In the conventional method for constructing a double wall structure described above, it is easy to assemble two facing wall surfaces 2 and 2 and the construction is simple, but the steel sheet pile segment 1 is oriented vertically. And the adjacent segments are vertically offset from each other,
At the time of rolling compaction work, the steel sheet pile segments 1 are in a state of standing up from the rolling compaction surface (the surface of the filling sand) every other row vertically, which is an obstacle to the compaction work and is dangerous. In this case, if the length of one steel sheet pile segment 1 is shortened,
The projecting height of the steel sheet pile segment 1 at the time of rolling operation can be reduced, but if the length of the steel sheet pile segment 1 is shortened, the number of steel sheet pile segments 1 to be used increases and the man-hour increases to improve the work efficiency. Is markedly reduced, which is not suitable.

The present invention has been made to solve the above-mentioned conventional drawbacks. The use of steel sheet piles facilitates the assembly of two opposing wall surfaces, and at the same time the wall surfaces project from the rolling surface during rolling work. It is an object of the present invention to provide a method for constructing a double wall structure in which the wall surface does not hinder the rolling work.

[0005]

According to the method for constructing a double wall structure of the present invention which solves the above-mentioned problems, the width of a steel sheet pile segment used as a wall surface is longer than the width of each of the two wall surfaces facing each other. A plurality of pillar materials are erected at intervals in the lateral direction along the wall surface, and a plurality of the above steel sheet pile segments are arranged side by side and fixed to these pillar materials to form a steel sheet pile segment wall surface in one row and facing each other. The wall forming step of connecting the steel sheet pile segment wall surfaces in one horizontal row with the tie member connected to the pillar material, and vertically connecting the pillar materials as necessary; The next step is the steel sheet pile in the next horizontal row on the wall surface of the steel sheet pile segment formed in the first row. Segment wall surface is continuous Characterized in that the steel sheet pile segments vertically adjacent to each other are arranged so as to be laterally displaced from each other and the joining claws are fitted to each other to be connected. .

[0006] The above-mentioned step of compacting and rolling is not limited to the case where it is performed once on the wall surface of the formed steel sheet pile segments in one row, and it is filled with earth and compacted and compacted again and filled with earth. It can also be performed in two steps of pressing or in three or more steps.

[0007]

In the above structure, since the steel sheet pile segments are arranged sideways to form a row of steel sheet pile segment wall surfaces, the sand is packed and the compaction is performed.
The wall surface of the steel sheet pile segment does not project above the rolling surface. Therefore, there is no problem that the wall surface of the steel sheet pile segment interferes with the rolling operation.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is an overall view of a double-wall structure constructed as a erosion control dam of a river in a mountainous area by the method of the present invention. FIG. 1 (a) is a front view and FIG. 1 (b) is a sectional view. The procedure for constructing this double-wall structure 10 will be described. First, as shown in FIGS. 2 and 3, first, a bottom threading member 11 made of, for example, channel steel is laterally provided at a position where two opposing wall surfaces are to be formed. 2 are arranged in the direction (the direction orthogonal to the paper surface in FIG. 2: the left-right direction in FIG. 3), and both bottom surface through members 11 are connected by a tie member 12. The tie member 12 has a configuration in which two deformed steel bars 12a with screw joints are connected by a female screw joint 12b. It is connected to the threading member 11.

On the bottom surface through member 11, for example, 250
mm to 500 mm width lightweight steel sheet pile is cut into a length of, for example, 2 m, and the segmented steel sheet pile segments 13 are arranged side by side to form the steel sheet pile segment wall surfaces 14 in the first horizontal row in a row. . In this case, both bottom surface through members 11
The tie member 1 is provided between the pillar members 15 made of, for example, channel steel set upright.
Then, the steel sheet pile segment 13 is fixed to the outer surface of the column member 15 with bolts 16. As shown in FIG. 4, the column member 15 and the tie member 12 are connected to each other by attaching a joint fitting 17 in which a flat bar is bent in a U shape to the end of a deformed steel bar 12a with a threaded joint by a nut 12c. 17 is fixed to the pillar 15 with bolts 18.
The length of the tie member 12 can be adjusted at the joint female screw 12b portion or the connection portion with the joint fitting 17.

Next, the earth and sand are packed in the space between the wall surfaces 14 of the steel sheet pile segments in one row in the first stage, and then the packed sand is compacted. In this case, the compaction is usually performed with a soil thickness of less than 300 mm. Therefore, if the width of the steel sheet pile is less than 300 mm, it is possible to perform the filling operation and the rolling compaction operation once for the steel sheet pile segment wall surfaces 14 in one row. Steel sheet pile width dimension is, for example, 500m
If it is about m, the filling work and the compaction work are performed in two steps.

Next, the steel sheet pile segments 13 vertically adjacent to each other on the wall 1 of the first row of the steel sheet pile segment walls 14 in the horizontal direction are separated from each other in the lateral direction.
The joining claws 13 should be displaced by a factor of 1 (see FIG. 1).
a) and 13b, and the steel sheet pile segment 13 is fixed to the pillar member 15 with the bolt 16 in the same manner as described above, and the pillar member 15
The tie members 12 are connected to each other to form steel sheet pile segment wall surfaces 14, 14 in the second row and one horizontal row.

Then, the earth and sand are packed in the space between the second-stage steel sheet pile segment wall surfaces 14 and 14 in the same manner as described above, and the packed sand and sand are compacted.

Hereinafter, a horizontal row of steel sheet pile segment wall surfaces 1
Repeating the process of forming 4 and 14 facing each other and filling the earth and sand and rolling it, the earth and sand are filled in between the wall surfaces W and W composed of the steel sheet pile segment wall surfaces 14 in one row in multiple rows. The rolled double wall structure 10 is constructed.

As shown in FIG. 1 (a) and FIG. 3, the column member 15 is provided at the end position of each steel sheet pile segment 13 on the steel sheet pile wall surface 14 in the horizontal row of the odd number stage. There is. Therefore, with respect to each steel sheet pile segment 13 in the steel sheet pile segment wall surface 14 in the horizontal row of even-numbered stages, the column member 15 passes through the central portion in the length direction. The column member 15 has an appropriate length, for example, 2 m, which is longer than the width of the steel sheet pile, and is vertically connected according to the process of forming the steel sheet pile segment wall surface 14 in one horizontal row. To connect the pillar members 15 in the illustrated example, flat plates 21 are applied to the three surfaces of the pillar members 15 at the connecting portions, and bolts 22 are applied.
It is tightened and fixed with. Further, at the upper end portion of the pillar material 15, a ridge crown material 25 for linearly aligning the upper end position of the pillar material 15 in the lateral direction is arranged. It is connected. In the illustrated example, the lower end portion and the upper end portion of the column member 15 are short column members 15,
It has been welded and fixed to the bottom surface threading member 11 or the bank material 25 in advance.

In addition, ordinary steel sheet pile joining claws 13a, 13
The shape of b is a shape in which one joining claw 13a is inserted into the joining claw 13b of the other steel sheet pile from the longitudinal direction so that the joining claws are fitted to each other. In the case of fitting, it is unsuitable as it is, so it is advisable to shorten at least one edge of the joining claws 13a and 13b. That is, in FIG. 6, the edge of one of the joining claws 13b is shortened (the shape shown by hatching is omitted) with respect to the cross-sectional shape of the ordinary joining claws 13a and 13b (the shape including the hatched portion in FIG. 6). And). As a result, the joining claws 13a and 13b can be fitted as indicated by the arrow from the position of the steel sheet pile width direction indicated by the two-dot chain line in FIG. As the steel sheet pile to be used, lightweight steel sheet pile is suitable from the viewpoint of cost and the like, but it is also possible to use hot steel sheet pile.

The means for fixing the steel sheet pile segment 13 to the column member 15 is not limited to the method of fixing with the bolts 16, but the mounting plate is welded and fixed to the steel sheet pile segment 13 in advance, and this mounting plate is fixed to the column member 15 by welding. It is also possible to adopt a method of fixing to the above with bolts or the like.

In the embodiment, the two wall surfaces facing each other are inclined to form a trapezoidal shape, but it is conceivable to form the wall surfaces vertically. FIG. 7 shows an example in which the wall surface W is formed vertically. In this embodiment, a stepwise multi-layered double wall structure is used, but the intermediate wall surface is formed only on the exposed portion, and only the pillar material 15 is required in the soil. In addition, in this example, the tie members 12 are connected to the pillar members 15 at the positions of the connecting portions of the steel sheet pile segments 13 that are vertically adjacent to each other.

Further, the pillar material 15, the tie member 12, the pillar material 15
The joint fitting 17 and other members for connecting the tie member 12 and the tie member 12 are not limited to the shapes shown in the drawings, and various other ideas are possible.

[0019]

EFFECTS OF THE INVENTION According to the present invention, the steel sheet pile segments are arranged laterally and the wall surface of one row of steel sheet pile segments is formed in one step, so that the earth and sand are filled in and compacted.
The wall surface does not stand up unnecessarily high during earth and sand filling work or compaction work, and the earth and sand filling work or compaction work becomes easy.

Unlike the conventional one in which the steel sheet pile segment is used vertically, even if the length of the steel sheet pile segment is increased, it does not project from the rolling surface, so that one steel sheet pile segment is used for workability. It can be taken for a long time without any hindrance, so the number of steel sheet pile segments required is small and wall surface assembly efficiency is improved.

[0021] The work procedure of filling the soil and compacting and rolling each time one wall sheet wall segment wall in one row is formed is extremely regular, and the setup of each work is simplified and expected to improve work efficiency. it can. Due to the above, the construction period can be shortened.

A suitable thickness of soil to be compacted at one time is usually about 250 mm on average, and this dimension is usually from 250 mm to
Since the width dimension of a commercially available lightweight steel sheet pile with a width of 500 mm or about half of that, it is assumed that the compaction compaction work of the horizontal one row steel sheet pile segment wall surface is carried out once or twice, Lightweight steel sheet pile is optimal as a wall material, has excellent material availability and is effective in reducing construction costs.

According to the second aspect of the present invention, the presence of the pillar member at the end position of the steel sheet pile segment results in a structure in which the connection in the length direction (lateral direction) of the steel sheet pile segment is stable, and the steel sheet pile segment. The risk of spillage of stuffed sand from the lengthwise connection is reduced.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a method for constructing a double wall structure according to the present invention. FIG. 1A is a front view of the double wall structure and FIG. 1B is a sectional view thereof.

FIG. 2 is an enlarged sectional view of a main part of the double wall structure.

FIG. 3 is a left side view of FIG.

FIG. 4 is a sectional view taken along line AA in FIG. 2;

5 is a sectional view taken along line BB in FIG.

FIG. 6 is an enlarged view of a joining claw portion of the lightweight steel sheet pile used in the embodiment.

FIG. 7 is a cross-sectional view of a double wall structure showing another embodiment of the method of the present invention.

FIG. 8 is a perspective view of a double wall structure according to a conventional method.

[Explanation of symbols]

 10 Double Wall Structure 12 Tie Member 13 Steel Sheet Pile Segment 13a, 13b Joining Claw 14 Horizontal 1 Row Steel Sheet Pile Segment Wall Surface 15 Pillar Material 17 Joint Metal Fitting 21 Flat Plate for Connecting Pillar Material 22 Bolt for Connecting Pillar Material W Wall Surface

Claims (3)

(57) [Claims] 1. A plurality of column members, each of which has a width greater than the width of a steel sheet pile segment used as a wall, is erected laterally along the wall at positions where two opposing wall faces are to be formed. A plurality of the steel sheet pile segments are laterally arranged and fixed to each other to form a horizontal row of steel sheet pile segment wall surfaces, and the opposing one horizontal row of sheet pile sheet wall surfaces are connected by a tie member connected to a pillar material. And the wall forming process that vertically connects the pillars as necessary,
On the steel sheet pile segment wall surface of the horizontal 1 row previously formed, both the steps of filling the earth and sand between the horizontal wall of the sheet pile segment wall surfaces and compacting the packed sand And the steel sheet pile wall segments in the next horizontal row are successively repeated so that vertically adjacent steel sheet pile segments are arranged laterally offset from each other and A method for constructing a double wall structure, characterized in that the joining claws of the above are fitted and connected. 2. The method for constructing a double wall structure according to claim 1, wherein the column member is provided at an end position of the steel sheet pile segment on the wall surface of the steel sheet pile segment in one row in one row. . 3. The method for constructing a double wall structure according to claim 1, wherein the joining claws of the steel sheet piles are shaped so that they can be fitted to each other in the width direction of the steel sheet piles.