JPH01137009A - Double wall structure using steel sheet pile as tie part - Google Patents

Abstract

PURPOSE:To obtain a dam structure without restricted by the kinds and amounts of filler material by a method in which an upstream wall and a downstream wall are connected by a tie part formed by connecting steel sheet piles displaced vertically and a filler material is packed into the space of the walls to construct a check dam. CONSTITUTION:A double wall structure consists of an upstream wall 2, a downstream wall 3, a tie part 1 to connect the walls 2 and 3, and soil and sand packed into the space surrounded by the walls 2 and 3. The tie part 1 is formed by connecting steel sheet pile segments vertically biased in a plate form. The double wall structure to be used as a check dam without restricted by the kinds of filler material and wall interval can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention 1] The present invention relates to a double wall structure. The present invention is particularly valuable when applied to double wall structures used for mountain and flood control.

[Purpose of the invention] 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 causes landslides. They attack forests, rivers, 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 double-wall structure, such as a double-wheel erosion control dam, to prevent such damage.

[Prior Art] Conventionally, such double wall structures have been known, including those based on the Terre Alme construction method using reinforced concrete or metal skin segments and strips, and those using the TUV construction method using expanded metal skin segments and tie rods. ing. however,
Since the Terre Alme construction method relies on the frictional force between the strip and the filling earth and sand, there are significant restrictions on the filling earth and sand material and on the distance between walls based on the length of the strip. That is, if the soil generated on site due to excavation cannot be used for filling, it is necessary to discard it and use separately purchased soil, or to stabilize the generated soil and use it.

Also, it is often necessary to perform large-scale excavation to ensure sufficient distance between walls. Expanded metal construction is very advantageous because it can be constructed quickly and requires less material to prepare and transport, but if the filler material flows out or settles after construction, the tie rods may become deformed, resulting in Since the wall surface may be deformed, it is necessary to carefully consider various conditions such as selection of filler material, compaction, and use of anti-wicking material when designing.

In addition, in either construction method, the strips or tie rods are used to apply pressure between the filler earth and sand and the skin segment, and to support that pressure, so they must be arranged at a fairly high density.

Roughly speaking, in a vertical section of a double wall structure in the upstream and downstream directions, the shear strength against shear forces in the upstream and downstream directions is:
It relies only on the pressure between the filler earth and the skin segment, and cannot be evaluated based on strength measurements.

Therefore, the inventor of the present invention has conducted repeated research, and has developed a design that is easier to design and construct.
They discovered a new, stronger double-wall structure and completed the present invention.

[Structure of the Invention] That is, the present invention includes a plurality of steel sheet pile segments that are connectable to each other at the side end portions, and the side end portions are arranged such that the horizontally adjacent segments are shifted from each other in the vertical direction. To provide a double wall structure in which an upstream wall and a downstream wall are connected by using vertical plate members connected to each other and arranged in the vertical and horizontal directions as tie members, and the inside is filled with earth and sand.

[Operation of the invention] The double partition wall construction method using steel sheet piles is known per se. However, this construction method is a construction method in which steel sheet piles, that is, steel plate piles, are driven into the ground to form a double wall, and is merely one form of using steel sheet piles as plate piles. The present invention utilizes the characteristic of steel sheet piles, in which the butts on both side end faces of adjacent plate piles are interconnected, while the basic characteristics of piles are divided into block-like segments. Based on the unique idea of changing to a unit. This idea of segmenting piles driven into the ground and assembling them into units on the ground in multiple stages is based on the steel sheet pile segment double wall structure described in JP-A-62-139.311, which was already proposed by the present inventor. This is common to the invention of the construction method.

The invention described in JP-A-62-139,311 uses steel sheet pile segments for the upstream and downstream walls of a double wall structure, but the present invention uses steel sheet pile segments as tie members for a double wall structure. It is used.

By using vertical plate members made of steel sheet pile segments as tie members according to the present invention, the following effects can be achieved.
7.

(a) There are almost no restrictions on the filling material and the distance between walls.

(b) Even if the filling earth and sand material flows out or settles, it will hardly affect the walls of the upstream and downstream walls.

(c) The arrangement interval of tie members can be considerably increased.

(d) It becomes possible to dramatically increase the shear strength of the double wall structure in the upstream and downstream directions, and to perform a design that takes into account the shear strength.

(By utilizing the function of the tie member as a partition wall and arranging different skin segments in the sections partitioned by the partition wall, the function of each section can be changed independently.

(f) When constructing on soft ground, it is also possible to reinforce the foundation by driving steel sheet piles into the ground as piles for their original purpose, and then continue to connect steel sheet pile segments to construct the structure. This makes it possible to eliminate the need to excavate to bedrock.

Steel sheet piles may be made in advance to a desired length, but it is more advantageous to cut commercially available steel sheet piles into appropriate lengths at a lower cost. Since it is used as a tie member, it is preferable to use flat steel sheet piles among commercially available steel sheet piles. The shape and structure of the joint of the connecting portion is arbitrary and can be appropriately selected from known ones.

Each segment is connected such that horizontally adjacent segments are vertically shifted from each other. By repeating this process, a plurality of segment rows in which a plurality of segments are lined up in the vertical direction are connected in the horizontal direction. Connections between rows are made by shifting the longitudinal position of the segments between adjacent rows of segments. The sliding distance is 1 of the length
It is preferable to set it to 72. In this case, in order to align the heights of the top and floor, it is sufficient to separately prepare a segment with a length of 1/2.

The direction in which the segment rows are extended is not limited to the vertical direction. Any slope can be provided for design reasons.

The spacing between tie members can be increased several times more than that of conventional tie rods. For example, if the tie rods are arranged at 1 m intervals, the interval can be set to 4 to 5 m or more. This increases the work space and makes it easier to use large earthen machinery.

The upstream and downstream walls can be constructed from steel sheet pile segments similar to tie members, expanded metal skin segments, angles, reinforcing bars, and any wall materials therein.

The connection of the tie member to the upstream and downstream walls may be made by welding, riveting, bolting, or any other means, with or without connection angles, plates, etc.

In general, it is advantageous to fill with 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 have the same size and shape as long as they can be connected to each other. If preferred for design reasons, it is easy to use materials with different dimensions and shapes together.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the embodiments illustrated in the accompanying drawings.

[Example] FIG. 1 schematically shows a perspective view of an erosion control dam as an example of the double wall structure of the present invention. This erosion control dam is constructed by connecting an upstream wall (2) and a downstream wall (3) at three points with tie members (1). The tie member (1) is a vertical plate member by connecting steel sheet pile segments, and is connected to the upstream wall (2).
) and the downstream wall (3) are of any wall material. Filled earth and sand are not shown.

The second example of the steel sheet pile segment used for the tie member (1) is
It is shown in a perspective view in the figure. The standard segment (11a) is made by cutting a flat steel sheet pile to an appropriate length, and has joints for connection at both ends.

The segments (11a) are connected to each other in the positional relationship shown in FIG. In order to align the heights of the top and floor, a half-length segment (11b) with a length of 172 of the standard segment is used. Although not shown, the segment in contact with the slope portion of the upstream wall (2) is a standard segment (11a) obtained by cutting the upper part of the standard segment (11a) more diagonally.

As the wall material constituting the upstream wall (2) and the downstream wall (3), ties and steel sheet pile segments similar to those of the member (1) can be used. At this time, tie member (1) and upstream wall (2
) and the downstream wall (3), an example of a connecting segment that can be used for the connection with the downstream wall (3) is shown in a perspective view in FIG.

The coupling segment (11G> is used for coupling with an inclined wall surface, and the coupling segment (11d) is used for coupling with an upright wall surface.

These joining segments (11c) (11d) can be made by cutting steel sheet piles into appropriate shapes and joining them together by welding or the like.

FIG. 4 shows a perspective view of the double wall structure constructed up to the second stage using the segments shown in FIGS. 2 and 3. Tie members (A1) (A2>) connect the inclined upstream wall (B) and the upright downstream wall (C). In Fig. 4, the connecting joints at the segment side ends are omitted from illustration. Also, the filling soil is not shown.

Expanded metal skin segments, angles or rebar can also be used as wall materials.

FIG. 5 shows a perspective view of an example in which an angle or a combination of an angle and an expanded metal plate is used on an upstream wall, and a combination of reinforcing bars and an expanded metal plate is used on a downstream wall. In the example shown in FIG. 5, five tie members (AI>(A2>(A3)(A4)(A5)) constructed in the same manner as in FIGS. 1 and 4 using the segments shown in FIG. A double wall erosion control dam is constructed by joining the upstream wall (B) and downstream wall (C).This erosion control dam is built on a foundation made of steel sheet piles (D) and concrete (E). However, concrete (E) is omitted and steel sheet pile (D) is used.
It is also possible to connect tie members (A1) to (A5) directly to .

An example of a connecting segment that can be used for the connecting portion between the tie members (A1) to (A5) and the upstream wall (B) is shown in a perspective view in FIG. The joining segment (11e) is for an inclined surface, and is made by welding a steel plate provided with bolt holes to a steel sheet pile segment whose upper part is cut diagonally. The joining segment (11f) is for an upright surface and consists of a section cut from a steel sheet pile segment along one side edge thereof and two angles. These sections and angles can be bolted together in situ during construction.

FIGS. 7 and 8 are enlarged front views of the connecting portion using the connecting segment (11e) and the connecting segment (11f) shown in FIG. 6, respectively.

In the example of FIG.
It consists of a wall unit (24) with an expanded metal plate (23) welded between the wall unit (22).
4) is applied from the back side of the connecting segment (11e) and connected with bolts and nuts. In the example of FIG. 8, the wall material consists only of angles (25). A-A in Figure 8
A line cross-sectional view is shown in FIG. In addition, considering the particle size of the filling soil, the expanded metal plate (23) can also be omitted in the example shown in Figure 7, and the expanded metal plate can also be used in the examples shown in Figures 8 and 9. can.

An example of a connecting segment that can be used for the connecting portion between the tie members (A1) to (A5) of FIG. 5 and the downstream wall (C) is shown in cross-sectional view in FIG. Connecting segment (1
1CJ) is the connecting segment (11f) shown in Figure 6.
It is similar to , but differs in that the angle is larger. A reinforcing bar (31) made by bending a deformed rod with a threaded portion at an angle of 11 g is connected with a nut.

Enlarged front view of the joint part of the downstream wall (C) and its B-B
Linear cross-sectional views are shown in FIG. 11 and FIG. 12, respectively. The wall material consists of reinforcing bars (31) and an expanded metal plate (33) secured to this with wire clips (32), and the inside of the expanded metal plate (33) is lined with a mat (3) to prevent filling soil from being sucked out.
4) is the place. When the particle size of the filling soil is large, the mat (34) is not necessary, and the expanded metal plate (33) can also be omitted.

The double-wall erosion control dam shown in Figure 1 has a downstream wall (3
) is for an upright wall, but may be for an inclined wall. In the case of a sloped wall, the arrangement of the segments of the tie member (1) may be such that the direction in which the segment rows extend is vertical as in the case of FIG. 1, but as shown in the side view in FIG. It is also possible to have an inclined direction as shown. If desired, it is also possible, on the contrary, to construct the tie member (1) of FIG. 1 with a row of segments extending in the oblique direction. Based on design considerations, the direction in which the segment rows extend can be selected as appropriate.

[Effects of the Invention] As is clear from the above embodiments, by using the vertical plate members made of steel sheet pile segments as tie members according to the present invention, a truly useful effect having the above-mentioned effects (a) to (f) can be obtained. You can get a double wall horizontal 3x thing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a double wall erosion control dam according to the present invention. FIG. 2 is a perspective view showing an example of a steel sheet pile segment that constitutes a tie member of the erosion control dam shown in FIG. FIG. 3 is a perspective view showing an example of a connecting segment used for a connecting portion between a tie member and a wall material when steel sheet pile segments are also used as a wall material. FIG. 4 is a perspective view of a double wall structure constructed up to the second stage using the segments shown in FIGS. 2 and 3. FIG. 5 is a perspective view of a double wall sabo dam constructed using expanded metal skin segment angles and reinforcing bars as wall materials. FIG. 6 is a perspective view showing an example of a connecting segment used for the upstream wall of the erosion control dam shown in FIG. 5. FIG. Figures 7 and 8 are enlarged front views of the joint portion of the upstream wall of the sabo dam in Figure 5 using the joint segments in Figure 6, and Figure 9 is an A-A in Figure 8. FIG. FIG. 10 is a sectional view showing an example of a connecting segment used for the downstream wall of the erosion control dam shown in FIG. 5. FIG. FIG. 11 is an enlarged front view of the connecting portion of the downstream wall of the sabo dam shown in FIG. 5 using the connecting segment l- of FIG. 10, and FIG. 12 is a sectional view taken along the line B--B. FIG. 13 is a side view of an erosion control dam showing a modification of the segment arrangement of tie members. 1... Tie member, 2... Upstream wall, 3... Downstream wall,
11a, 11b... steel sheet pile segments, 11C to 11
Q...Connection segment drawing t completed F row (Contents (no cube) Figure 1 Figure 4 A2 Figure 5 Δ1 Figure 11 Figure 12 Figure 13 Procedure correction (method) % formula % 1 , Incident Display 1988 Patent Application No. 290600@
2. Title of the invention Double wall structure using steel sheet pile segments as tie members 3. Person making the amendment Relationship to the case Patent applicant (
1 idiot) (Shipped on February 23, 1988) 6. Subject of amendment (1) Power of attorney (2 copies) (2) Engraving of drawings (no change in content) 7. Contents of amendment As shown in the attached sheet - C :%7

Claims (6)

[Claims] (1) A plurality of steel sheet pile segments that can be connected to each other at the side ends are connected to each other at the side ends in the vertical and horizontal directions such that horizontally adjacent segments are vertically shifted from each other. A double-wall structure in which the upstream and downstream walls are connected using vertical plate members arranged side by side as tie members, and the interior is filled with earth and sand. (2) The structure described in the preceding item (1), which uses commercially available steel sheet piles cut transversely into appropriate lengths as the steel sheet pile segments. (3) The method according to the preceding item (1), in which the segments are connected to each other at the side ends so that the horizontally adjacent segments are shifted from each other by 1/2 of the length in the vertical direction. Structure. (4) The structure according to the preceding item (1), using a steel sheet pile segment plate member similar to the tie member as the upstream wall or the downstream wall. (5) The structure described in (1) above, using expanded metal segments as the upstream wall or the downstream wall. (6) The structure described in the preceding paragraph (1) using angles or reinforcing bars as the upstream wall or downstream wall.