JPH0369408B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of constructing a cellular structure.

The present invention is particularly valuable when applied to cell structures used for mountain and flood control. Japan is often hit by torrential rains caused by typhoons and has steep mountainous areas, so water flowing down steep slopes not only erodes and devastates slopes and riverbeds, but also turns into mudflows and destroys forests and rivers. , attacking civil engineering structures, cultivated land, and villages, causing great damage. In addition, damage caused by mudflows and landslides caused by rain or collapse of volcanic ash and debris deposited by volcanic eruptions is also significant. A particular object of the present invention is to provide a method for constructing a cellular structure, such as a cellular erosion control dam, to prevent such damage.

Conventionally, as such cell structures, those made of reinforced concrete and those made of expanded metal are known. However, since reinforced concrete structures require time and effort to formwork, they cannot be constructed quickly even in cases where construction is urgently required, such as disaster prevention and recovery. Since it is necessary to prepare and transport a large amount of materials, construction is difficult if the road conditions are poor. In this regard, expanded metal products are very advantageous because they can be constructed quickly and require only a small amount of materials to prepare and transport, but their use is limited due to their wear and impact resistance. Sometimes.

Therefore, the present inventor conducted repeated research and discovered a new method for constructing a cell structure that is easier to design and construct and can construct a stronger cell structure, thereby completing the present invention.

That is, the present invention provides the following steps: (a) preparing a plurality of each of steel sheet pile segments and rod members that can be connected to the rod members at the side ends; (b) installing the rod members in a vertical direction at intervals of the width of the steel sheet piles; C) Arranging and connecting steel sheet pile segments in a checkerboard pattern between rod members to form a cell with partial openings in the wall, (d) At any appropriate stage during the connection process of (B) and (C) above. Provided is a method for constructing a partially open cell structure of steel sheet pile segments, characterized by: filling the interior of the cell with earth and sand.

The cell construction method using steel sheet piles is itself known. However, this construction method is a construction method in which steel sheet piles, that is, steel plate piles, are driven into the ground so that the horizontal cross section is annular, such as circular, kite-shaped, or clover-shaped. It remains just one form of use. The present invention focuses on the characteristic of steel sheet piles, in which the butts on both side end faces of adjacent plate piles are interconnected, and the basic characteristics of the piles are divided into block-like units. It is based on the unique idea of arranging and connecting the rod members in a checkerboard pattern without interconnecting the ends of the units. This idea of segmenting the piles driven into the ground and combining them with rod members to form a multi-stage unit on the ground in a checkerboard pattern is completely new and not found in the prior art.

According to the present invention, by segmenting steel sheet piles, the weight of the members is reduced, and by assembling these lightweight segments from below in multiple stages, large-sized steel sheet piles, which were required in the conventionally known steel sheet pile cell construction method, can be reduced in weight. This eliminates the need for construction machinery and construction rings, making it possible to build on-site with poor road conditions.

Although steel sheet pile segments are heavier per unit than expanded metal units, they have excellent wear resistance and impact resistance, and because the segments are arranged and connected in a checkered pattern, partially open walls can be obtained. Therefore, the weight of the opening can be further reduced.

Although the steel sheet pile segments may be made in advance to a desired length, it is more advantageous to cut commercially available steel sheet piles into appropriate lengths and use them at lower cost.
Among the commercially available steel sheet piles, it is preferable to use straight steel sheet piles, which are strong against tension in the normal direction and are used for constructing cellular bulkheads.

The shape and structure of the joint of the connecting portion may be arbitrary as long as connection with the rod member is possible. Advantageously, the connection with the bar member is such that it allows relative rotation about the bar axis. Instead of a direct connection between the side ends of the steel sheet pile segments, by making a connection that allows relative rotation via this rod member, it is possible to greatly increase the angle between adjacent steel sheet pile segments. Become. This means that cells with a small diameter relative to the width of the steel sheet pile segment can be constructed. Such a relatively rotatable connection can be made immediately by inserting a rod member of an appropriate diameter into the connecting portion of the original steel sheet pile side ends from commercially available steel sheet piles. This can be achieved by selecting an appropriate steel sheet pile. It is also possible to use newly fabricated steel sheet pile segments for this rotatable connection purpose.
Such new steel sheet pile segments include, for example, steel plates provided with longitudinally extending pipe portions at their side ends.

As the bar member, a round steel bar, a deformed steel bar, a steel pipe, etc. can be used. Its diameter can be appropriately determined depending on the combination with the steel sheet pile segment to be used. Its length should be the same as or longer than the length of the steel sheet pile segment, and the connecting part of the bar member should not overlap with the contacting part of the upper and lower segments. It is generally preferred that the length be about 5 to 6 times the segment length.

Earth and sand of a size that cannot be sucked out from the openings between the segments is normally used as filling material, but if a material to prevent sand suction is installed in the openings, it is also possible to use earth and sand of a smaller size. In order to make the most of the water-permeable structural characteristics that do not require drainage holes, it is preferable to use large-sized earth and sand as the filling material. In this case, the permeability to allow fine-grained soil to pass through is also maintained.

It is advantageous to fill in the earth and sand for each stage when the segment length is one stage. Filling increases the independence of each tier, and also facilitates the subsequent construction of the upper tier and the filling of the upper tier. The height of one stage, that is, the segment length, can be appropriately determined by taking into account the ease of transporting and assembling the segments and the overall construction efficiency.

The segments used do not necessarily have to be of the same size and shape. If preferred for design reasons, it is easy to use materials with different dimensions and shapes together. For example, use long segments at the bottom and shorter segments toward the top, and
It is possible to build structures with different heights of steps.

Hereinafter, the present invention will be described in more detail with reference to the embodiments illustrated in the accompanying drawings.

Commercially available straight steel sheet piles with a width of 0.4 m are cut horizontally to create multiple segments with a length of 0.15 m.

As shown in Figure 1, round steel rods are erected vertically at intervals between the widths of the segments, the segments are inserted between the rod members in a checkered pattern, and earth and sand are filled. FIG. 2 is a perspective view of a partially open cell structure having a diameter of about 3 meters and a height of about 3 meters constructed as shown in FIG.

FIG. 3 is a perspective view showing an example of using a segment having the same dimensions as the segment shown in FIG. 1, but newly made by providing a vertically extending pipe portion at the side end of a steel plate.

Figures 4 (front view) and 5 show examples of transmission type dams using the cell structures shown in Figures 1 and 2.
As shown in the figure (plan view).

Six cell structures C1 to C6 [C4 to C5 are not shown in Figure 4] constructed using segments with a width of 0.4 m and a length of 0.15 m each have a diameter of 3
The height is 3 m, and the slit interval is 1 m.
4 indicates the field surface line, 5 indicates the sleeve concrete, and 6 indicates the embankment.

Since each cell consists of multi-stage segments, in order to facilitate water treatment during construction,
Adjacent cells can be made to rise with a difference in height.

In addition, since there are no structural members inside the cell, it is easy to carry out a series of earthworks such as bringing in the filling material, rolling it out, and compacting it, and even if the filling material sinks, it will be dragged into the cell. There is no deformation of the wall surface. This increases the degree of freedom in selecting soil materials and construction methods for filling, and eliminates the need for river bed excavation for foundation work if rod members can be driven in.

Furthermore, the outer wall structure is lightweight, has the strength of a steel sheet pile wall, and has excellent abrasion resistance and impact resistance.

The assembly work is simple, as it only involves connecting the segments to the bar members, and does not require bolts or other connecting members, and it is easy to match the basic shape of the dam to the topography of the foundation ground. Therefore, not only construction but also design work can be done easily.

As is clear from the above, the present invention provides a method for constructing a partially open cell structure in a very clever manner based on the unique idea of segmenting steel sheet piles and assembling them into units in multiple stages on the ground. It is extremely useful industrially as it has achieved this effect.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one step in the process of constructing a steel sheet pile segment partially open cell structure according to the present invention, and FIG. 2 is a partially open cell structure constructed through the steps shown in FIG. FIG.
FIG. 3 is a perspective view showing a modification of FIG. 1, and FIGS. 4 and 5 are a front view and a plan view, respectively, of a transmission type dam using the partially open cell structure shown in FIG. It is a diagram. C1-C6...Cell, 4...Local board line, 5...
...Sleeve concrete, 6...Pressure embankment.

Claims (1)

[Claims] 1. (a) A plurality of each of steel sheet pile segments and rod members that can be connected to the rod members at the side ends are prepared, and (b) the rod members are installed vertically at intervals of the width of the steel sheet piles. , (c) arranging and connecting steel sheet pile segments in a checkerboard pattern between the bar members to form a cell with partial openings in the wall, (d) performing any suitable operation during the connection process of (b) and (c) above. 1. A method for constructing a partially open cell structure made of steel sheet pile segments, comprising: filling the interior of the cell with earth and sand at a certain stage. 2. The method according to item 1 above, in which steel sheet piles having mutual connection joints on both end faces are cut transversely into appropriate lengths as the steel sheet pile segments. 3. The method according to item 1 above, in which the steel sheet pile segment is made of a steel plate with a longitudinally extending pipe section provided at the side end. 4 The cell is constructed by alternately repeating the connection of one stage of segments and the filling of the inside of that stage with earth and sand, as described in the previous item 1.
The method described in.