JP7102228B2 - How to build concrete sheet pile members, earth retaining walls and earth retaining walls - Google Patents

Description

The present invention relates to a retaining wall required for construction of, for example, a waterway or a road.

When constructing a retaining wall with a reinforced concrete structure, concrete sheet piles are often used, but conventional cap concrete sheet piles have a plate-like structure up to the rooting part where structural strength is not required, which is uneconomical. Was there. In addition, the concrete volume of the rooting part hindered the driving of the concrete sheet pile into the ground.

As a construction method that is superior in cost and workability to the above construction method, there is a parent pile horizontal sheet pile construction method as in Patent Document 1. This method is a method of constructing a retaining wall by driving multiple parent piles into the ground at intervals and stacking sheet piles between each parent pile.

Japanese Unexamined Patent Publication No. 2009-68203

The earth retaining wall constructed by the parent pile horizontal sheet pile method of Patent Document 1 is in a state where the above-ground part of the parent pile not embedded in the ground is exposed. Therefore, when a steel material having flanges at both ends of the web such as H-shaped steel or I-shaped steel is used as the main pile, the main pile is exposed to wind and rain, and the main pile is rusted. It will occur. Then, when the main pile is rusted, the rust appears on the appearance of the earth retaining wall, so that the appearance quality of the earth retaining wall deteriorates. In this case, if the earth retaining wall is a temporary one that is temporarily installed at a construction site, rusting of such a parent pile is not a big problem, but the earth retaining wall and the side of the road when constructing a waterway If it is a permanent earth retaining wall such as an earth retaining wall, the landscape will be spoiled. In addition, if the rust of the main pile progresses, the durability of the main pile will also be adversely affected.

The present invention has been made in view of the above circumstances, and is to improve the appearance quality of the earth retaining wall using steel materials having flanges at both ends of the web as the main pile and to improve the durability of the main pile. The purpose.

The present invention for solving the above problems is a concrete sheet pile member installed between adjacent parent piles of a retaining wall provided with a plurality of parent piles made of steel having flanges at both ends of the web, which are adjacent to each other. The first protruding portion extending in the width direction at both ends in the width direction of the concrete sheet pile member and the adjacent parent so as to be located inside the flange of the parent pile when installed between the matching parent piles. At least one end of the concrete sheet pile member in the width direction so as to cover the entire front side width of the front side flange of the exposed parent pile that is not embedded in the ground when installed between piles. It has a second protruding portion extending in the width direction, and the protruding length of the second protruding portion is longer than the width of the front side surface of the front side flange of the main pile .

The present invention from another viewpoint is a retaining wall provided with a master pile made of a steel material having flanges at both ends of the web and the concrete sheet pile member, and the master pile has a retaining wall having a flange surface. A plurality of concrete sheet pile members are installed at intervals in a direction parallel to the width direction of the above, and the concrete sheet pile member has a flange on the front surface side of the main pile between the first protruding portion and the second protruding portion. It is characterized in that it is installed between the adjacent parent piles so as to be located.

Further, the present invention from another viewpoint is a method for constructing a retaining wall provided with a master pile made of a steel material having flanges at both ends of the web and the concrete sheet pile member described above, wherein the master pile is flanged. A plurality of concrete sheet pile members are installed at intervals so that the surfaces are parallel to the width direction of the retaining wall, and the concrete sheet pile member is placed between the first protruding portion and the second protruding portion of the parent pile. It is characterized in that a retaining wall is constructed by installing it between the adjacent parent piles so that the flange on the front side is located.

In the earth retaining wall according to the present invention, the entire exposed portion of the main pile not embedded in the ground is covered with a concrete sheet pile member, so that the appearance of the earth retaining wall does not show rust of the main pile, and the main pile is not exposed. Is less likely to be exposed to wind and rain, and the growth of rust on the main pile can be suppressed.

According to the present invention, it is possible to improve the appearance quality of the earth retaining wall using the steel material having flanges at both ends of the web as the main pile and to improve the durability of the main pile.

It is a front view which shows the schematic structure of the earth retaining wall which concerns on 1st Embodiment of this invention. It is a side view which shows the schematic structure of the earth retaining wall which concerns on 1st Embodiment of this invention. FIG. 5 is a sectional view taken along the line AA in FIG. It is a figure for demonstrating the construction method of the earth retaining wall. It is a figure for demonstrating the construction method of the earth retaining wall. It is a figure for demonstrating the construction method of the earth retaining wall. It is a figure which shows the schematic structure of the earth retaining wall which concerns on 2nd Embodiment of this invention, and is the figure which corresponds to the AA cross section in FIG. In this figure, the hatching showing the cross section is omitted for convenience of explaining the fastener for connecting the concrete sheet piles. It is a figure which shows the modification of the 2nd Embodiment of this invention, and is the top view of the concrete sheet pile. It is a top view which shows the schematic structure of the earth retaining wall which concerns on 3rd Embodiment of this invention. It is a front view which shows the schematic structure of the earth retaining wall which concerns on 4th Embodiment of this invention. It is a side view which shows the schematic structure of the earth retaining wall which concerns on 4th Embodiment of this invention. It is a front view which shows the schematic structure of the earth retaining wall which concerns on 5th Embodiment of this invention. It is a side view which shows the schematic structure of the earth retaining wall which concerns on 5th Embodiment of this invention. It is a figure which shows the shape example of the 1st protrusion of a concrete sheet pile. It is a figure which shows the shape example of the 1st protrusion of a concrete sheet pile.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

<First Embodiment>
As shown in FIGS. 1 to 3, the retaining wall 1 of the first embodiment is a steel material having a web 2a and flanges 2b formed at both ends of the web 2a (for example, H-shaped steel or I-shaped steel). It is composed of a plurality of parent piles 2 and concrete sheet piles 3 installed between adjacent parent piles 2. In the following description, the left side of the earth retaining wall 1 shown in FIG. 2 is referred to as a front side, and the right side of the earth retaining wall 1 shown in FIG. 2 is referred to as a back side. Further, in the description of the main pile 2 and the concrete sheet pile 3, the left side of FIG. 2 is referred to as the front side, and the right side of FIG. 2 is referred to as the back side. The "front side" is the side that is visually recognized as the appearance of the earth retaining wall 1, and the "back side" is the side that is covered with the ground and is not visually recognized as the appearance of the earth retaining wall 1.

A part of the main pile 2 is embedded in the ground in a direction in which the flange surface is parallel to the width direction W of the retaining wall 1. The rest of the main pile 2 is in a state of protruding above the ground, and the plurality of main piles 2 are arranged at intervals in such a state. The concrete sheet pile 3 is higher in height than the parent pile 2 on the ground portion, and the concrete sheet pile 3 is installed by being fitted one by one between the parent piles 2. In the earth retaining wall where fence plates are stacked between adjacent parent piles as in the conventional parent pile horizontal sheet pile method, earth and sand are sucked out from the gaps between the fence plates in the height direction, and the fence plates are easily removed. However, as in the first embodiment, the concrete sheet pile 3 having a single structure is installed between the adjacent parent piles 2, so that there is no gap in the height direction between the parent piles 2. It is possible to suppress the suction of earth and sand on the back side of the earth retaining wall 1. Thereby, the appearance quality of the earth retaining wall 1 can be further improved. Further, the concrete sheet pile 3 installed between the adjacent main piles 2 is less likely to come off as compared with the case where the fence plate is installed between the main piles 2, so that the durability as the earth retaining wall 1 is improved. In the example shown in FIG. 2, the height of the main pile 2 on the ground portion is lower than the height of the concrete sheet pile 3, but the height of the main pile 2 may be the same as the height of the concrete sheet pile 3. ..

As shown in FIG. 3, at both ends of the concrete sheet pile 3 in the width direction W, first protrusions 3a extending in the width direction W located inside the flange 2b on the front surface side of the main pile 2 are formed. .. Further, at one end of both ends of the concrete sheet pile 3 in the width direction W, a second protruding portion 3b extending in the width direction W so as to cover the entire outside of the flange 2b on the front surface side of the main pile 2 Is formed. At one end of the concrete sheet pile 3 in the width direction, a first protrusion 3a and a second protrusion 3b are formed, so that a groove exists between the protrusions 3a and 3b.

The concrete sheet pile 3 is attached by being fitted so that the first protruding portion 3a is caught inside the flange 2b of the main pile 2 as in the conventional main pile horizontal sheet pile method. By being attached in this way, the concrete sheet pile 3 is prevented from falling in front of the earth retaining wall 1. The width direction length of the second protruding portion 3b of the concrete sheet pile 3 is longer than the width direction length of the flange 2b of the main pile 2, whereby the flange 2b of the main pile 2 on the front side of the retaining wall 1 is formed. The whole is covered. The rooting portion of the main pile 2 of the retaining wall 1 (the portion below the ground surface GL1 on the front side in FIG. 2) is covered with the ground on the front side and the ground on the back side of the retaining wall 1, but the parent The above-ground part of the pile 2 is covered only with the ground on the back side. That is, when the second protruding portion 3b of the concrete sheet pile 3 shown in FIG. 3 does not exist, the flange 2b on the front surface side of the above-ground portion of the main pile 2 is exposed. On the other hand, the earth retaining wall 1 of the first embodiment has a shape such that the second protruding portion 3b of the concrete sheet pile 3 shown in FIG. 3 covers the flange 2b of the parent pile 2. Therefore, the earth retaining wall 1 is earth retaining. When the wall 1 is constructed, the main pile 2 cannot be seen from the outside of the retaining wall 1.

Further, as shown in FIG. 3, in the first embodiment, between the main pile 2 and the first protruding portion 3a of one of the first protruding portions 3a at both ends in the width direction of the concrete sheet pile 3. , A gap 4 is formed to absorb the construction error of the main pile 2 in the width direction W. For example, even if the main piles 2 are designed to be installed at equal intervals, they were actually installed at the design intervals of the main piles 2 according to the condition of the ground and the proficiency level of the builder during actual construction. An error may occur in the distance between the main piles 2. When such an error occurs, if no extra gap is provided between the main pile 2 and the concrete sheet pile 3, the concrete sheet pile 3 hits the main pile 2 and the concrete sheet pile 3 is placed between the main piles 2. It may not be installed smoothly. Therefore, it is preferable that the concrete sheet pile 3 is formed so that a gap 4 is provided between the main pile 2 and the concrete sheet pile 3 to absorb a construction error in the width direction W of the main pile 2. As a result, even if a construction error in the width direction W of the main pile 2 occurs during actual construction, the concrete sheet pile 3 can be smoothly installed between the adjacent main piles 2, and the workability is improved. .. In the first embodiment, the gap 4 is provided between the main pile 2 and the first protruding portion 3a of the concrete sheet pile 3, but the first protruding portion 3a on the other side and the main pile 3 are provided. A gap 4 may be further provided between the two. That is, from the viewpoint of improving workability, regardless of the shape of the main pile 2 and the concrete sheet pile 3, the gap 4 for absorbing the construction error in the width direction W of the main pile 2 is the main pile 2 and the concrete sheet pile 3. It suffices that the concrete sheet pile 3 is formed so as to be provided between the two.

The retaining wall 1 as described above is constructed as follows, for example.

First, as shown in FIG. 4, a grid-shaped formwork 10 having a plurality of linearly extending members is temporarily installed in the area where the main pile 2 and the concrete sheet pile 3 are installed. Each member constituting the formwork 10 is made of a steel material such as H-shaped steel, and each formwork component member is embedded in the ground or connected to each other to fix the positional relationship with each other. .. In the present embodiment, the formwork 10 is formed by four H-shaped steels 11 having a part embedded in the ground and the rest protruding above the ground, constraining the positions of other formwork constituent members fixed to each other. Has been done. The method of connecting the formwork components is not particularly limited, but they are connected by using various narrowing metal fittings and fastening metal fittings.

In the present specification, the direction perpendicular to the width direction W in the plan view is referred to as the vertical direction V, and the pair of mold constituent members 12a and 12b fixed in the longitudinal direction toward the width direction W are referred to as the parent pile 2. It is called a vertical restraint jig 12 that restrains the position of the concrete sheet pile 3 in the vertical direction. The distance between the pair of formwork constituent members 12a and 12b constituting the vertical restraint jig 12 is appropriately changed according to the size of the main pile 2 and the concrete sheet pile 3. Further, the pair of mold constituent members 13a and 13b arranged so as to straddle the vertical restraint jig 12 and fixed so that the longitudinal direction faces the vertical direction V restrain the position of the main pile 2 in the width direction W. It is referred to as a width direction restraint jig 13. The distance between the pair of formwork constituent members 13a and 13b constituting the width direction restraint jig 13 is the same as the width direction length of the flange 2b surface of the main pile 2. In the example shown in FIG. 4, three width direction restraint jigs 13 are provided at intervals, but the number of width direction restraint jigs 13 is the number of main piles 2 installed in one formwork 10. It is changed as appropriate according to.

After assembling the formwork 10 shown in FIG. 4, the parent pile 2 is installed in the area surrounded by the vertical restraint jig 12 and the width direction restraint jig 13 as shown in FIG. Here, a part of the main pile 2 is embedded in the ground in a state where the flange 2b surface is parallel to the width direction W, and the rest is in a state of projecting to the ground. Further, in the present embodiment, the distance between the pair of formwork constituent members 13a and 13b constituting the width direction restraint jig 13 is the same as the width direction length of the flange 2b surface of the main pile 2. , When embedding the main pile 2 in the ground, the position of the main pile 2 in the width direction W can be constrained. Thereby, the position accuracy of the main pile 2 in the width direction W can be improved.

Further, in the present embodiment, a spacer 14 having the same thickness as the thickness of the second protruding portion 3b of the concrete sheet pile 3 is provided in the area surrounded by the vertical restraint jig 12 and the width direction restraint jig 13. The spacer 14 is arranged so as to be in contact with the front side formwork member 12b of the pair of formwork member 12a and 12b of the vertical restraint jig 12. As a result, the distance between the mold component 12a on the back side of the vertical restraint jig 12 and the spacer 14 is the same as the distance between the pair of flanges 2b of the main pile 2, so that the main pile 2 can be moved. When embedding in the ground, the position of the main pile 2 in the vertical direction V can be constrained. Even if the spacer 14 is not provided, the position accuracy of the main pile 2 in the vertical direction V can be obtained by embedding the main pile 2 in the ground while applying the main pile 2 to the formwork component 12a on the back side of the vertical restraint jig 12. It is possible to improve. However, in order to further improve the positional accuracy of the main pile 2 in the vertical direction V, it is preferable to provide the spacer 14 as in the present embodiment. Further, the formwork 10 may be appropriately reassembled at the stage of installing the main pile 2 and the stage of installing the concrete sheet pile 3, and the distance between the pair of formwork constituent members 12a and 12b of the vertical restraint jig 12 may be changed. However, by providing the spacer 14, it is possible to omit the work of reassembling the mold 10.

After the main pile 2 is installed, the width direction restraint jig 13 is disassembled as shown in FIG. 6, and the concrete sheet piles 3 lifted by the crane are installed one by one between the adjacent main piles 2. At this time, the first protruding portion 3a of the concrete sheet pile 3 is located inside the flange 2b on the front side of the main pile 2, and the second protruding portion 3b of the concrete sheet pile 3 is located on the front side of the main pile 2. The direction of the concrete sheet pile 3 is adjusted so that the concrete sheet pile 3 is lowered so as to be located outside the flange 2b of the concrete sheet pile 3. In the present embodiment, the second projecting portion 3b is located in the gap between the already installed main pile 2 and the formwork component 12b on the front side constituting the vertical restraint jig 12. By lowering the concrete sheet pile 3, the concrete sheet pile 3 can be installed while restraining the position of the concrete sheet pile 3 in the vertical direction V. In order to improve the positional accuracy of the concrete sheet pile 3 in the vertical direction V, it is preferable that the main pile 2 is provided with the guide member 20 as shown in FIG. 9 described later.

After installing the concrete sheet pile 3 in the formwork 10, the formwork 10 is disassembled. After that, the formwork 10, the main pile 2, the concrete sheet pile 3, and the formwork 10 are repeatedly disassembled along the width direction W of the earth retaining wall 1 to construct the earth retaining wall 1. In the examples shown in FIGS. 4 to 6, two concrete sheet piles 3 are installed in the formwork 10, but the number of concrete sheet piles 3 installed in the formwork 10 is not particularly limited, for example. It may be 8 to 10 sheets. Further, the method of constructing the earth retaining wall 1 is not limited to the above method. For example, the configuration of the formwork 10 is not limited to that described in the present embodiment, and the positions of the main pile 2 in the width direction W and the vertical direction V are constrained, and the positions of the concrete sheet pile 3 in the vertical direction V are constrained. Any configuration can be used. By using such a formwork 10, the positional accuracy of the main pile 2 and the concrete sheet pile 3 can be improved, but it is possible to construct the earth retaining wall 1 without providing the formwork 10. Further, the specific means for embedding the main pile 2 and the concrete sheet pile 3 is not particularly limited. For example, the main pile 2 and the concrete sheet pile 3 may be driven into the ground, or the ground may be excavated in advance, the main pile 2 and the concrete sheet pile 3 may be placed at predetermined positions, and then the surrounding ground may be backfilled. good.

According to the earth retaining wall 1 of the first embodiment described above, the exposed portion of the main pile 2 in the above-ground portion not embedded in the ground, that is, the outside of the flange 2b on the front side of the main pile 2 is the first of the concrete sheet pile 3. Since it is covered with the protruding portion 3b of 2, even if the main pile 2 is rusted, the rust cannot be visually recognized from the outside of the retaining wall 1. Therefore, the appearance of the earth retaining wall 1 can be maintained even after a long time has passed after the construction of the earth retaining wall 1, and the appearance quality can be improved as compared with the earth retaining wall 1 of the conventional parent pile horizontal sheet pile method. can. Further, according to the earth retaining wall 1 of the first embodiment, since the main pile 2 is less likely to be exposed to wind and rain or the like with respect to the conventional earth retaining wall 1, the main pile 2 can be made less likely to rust.

<Second embodiment>
The earth retaining wall 1 of the second embodiment shown in FIG. 7 is formed by connecting adjacent concrete sheet piles 3 of the earth retaining wall 1 of the first embodiment with fasteners 5 (for example, bolts and nuts). As a result, even if an earthquake or the like occurs, the function as the retaining wall 1 can be easily maintained. In the example shown in FIG. 7, bolts and nuts are used as fasteners 5, and adjacent concrete sheet piles 3 are connected by passing bolts through the first protruding portion 3a of adjacent concrete sheet piles 3 in the width direction W. There is. In the example shown in FIG. 7, both ends in the width direction of the concrete sheet pile 3 are thicker than the central portion in the width direction, and it becomes easier to pass a bolt from the width direction W through the first protrusions 3a formed at both ends in the width direction. ing.

The fastener 5 is not particularly limited, and how the concrete sheet piles 3 are connected by using the fastener 5 is not particularly limited, but a method in which a through hole is not formed on the front surface side of the concrete sheet pile 3. It is preferable to connect with. For example, when a bolt is used as the fastener 5 as shown in FIG. 7, if the bolt is passed in the direction perpendicular to the width direction W in a plan view, a hole (non-perforated) penetrating from the front side to the back side of the concrete sheet pile 3. (Shown) needs to be formed. In that case, when the earth retaining wall 1 is exposed to wind and rain, or when the earth retaining wall 1 is used as a water channel, water may enter through the through hole of the concrete sheet pile 3 and the main pile 2 may be easily rusted. Therefore, when a bolt is used as the fastener 5, it is preferable to connect the concrete sheet pile 3 so that the bolt is passed in the width direction W. Further, in the example shown in FIG. 7, bolts are passed through the web 2a of the main pile 2, but adjacent concrete is passed by passing the bolt through the head of the concrete sheet pile 3 located higher than the upper end of the main pile 2. The sheet pile 3 may be connected.

Further, for example, as shown in FIG. 8, adjacent concrete sheet piles 3 may be connected through bolts so as to pass through the second protruding portion 3b of the concrete sheet pile 3. In the example shown in FIG. 8, a hole (not shown) having a depth in the width direction W is formed on the widthwise end surface of the second protrusion 3b of the concrete sheet pile 3, and the second concrete sheet pile 3 adjacent to the concrete sheet pile 3 has a depth. Similar holes (not shown) are formed on the widthwise end faces of the facing portions of the protruding portions 3b. Each hole is formed at the same height. Further, a work hole 6 for tightening bolts is formed on the upper surface of each concrete sheet pile 3, and the work hole 6 has a size capable of inserting a tool or a builder's hand. There is. When connecting such concrete sheet piles 3, first, a bolt is inserted into the hole of the second protruding portion 3b of the concrete sheet pile 3 to be installed, and the concrete sheet pile 3 in that state is installed between the adjacent parent piles 2. .. At this time, the bolts are prevented from protruding from the widthwise end faces of the concrete sheet pile 3. After that, the adjacent concrete sheet pile 3 is installed. Then, the bolt is passed through the hole of the adjacent concrete sheet pile 3 through the work hole 6 and fastened with a nut. As a result, the adjacent concrete sheet piles 3 are connected.

<Third embodiment>
The earth retaining wall 1 of the third embodiment shown in FIG. 9 is provided with a guide member 20 in contact with the back surface of the first protruding portion 3a of the concrete sheet pile 3 on the web 2a of the main pile 2. The guide member 20 has a shape protruding from the web 2a of the main pile 2 in the width direction W, and the distance between the protruding portion of the guide member 20 and the flange 2b on the front surface side of the main pile 2 is the concrete sheet pile 3. The thickness is equivalent to the thickness of the first protruding portion 3a of the above. Therefore, when the concrete sheet pile 3 is installed, the first protruding portion 3a is embedded in the ground so as to be inserted between the guide member 20 and the flange 2b on the front side of the main pile 2. To go. As a result, when the concrete sheet pile 3 is embedded in the ground, the position of the concrete sheet pile 3 in the vertical direction V can be restrained, and the concrete sheet pile 3 can be suppressed from falling toward the back side.

The guide member 20 is made of, for example, a steel material. Further, in the example shown in FIG. 9, an L-shaped angle steel (angle) is used as the guide member 20, but the shape of the guide member 20 is not particularly limited. Further, the guide member 20 may be fixed to the main pile 2 at the construction site of the earth retaining wall 1, for example, by welding, or is fixed to the main pile 2 in advance before the main pile 2 is carried into the construction site. You may.

<Fourth Embodiment>
In the earth retaining wall 1 of the fourth embodiment shown in FIGS. 10 and 11, a pressure receiving plate 7 for receiving passive earth pressure is attached to the rooting portion of the main pile 2. The pressure receiving plate 7 has a longer length in the width direction W than the main pile 2. By providing such a pressure receiving plate 7, the earth retaining wall 1 becomes more robust, and the function as the earth retaining wall 1 can be maintained even if the back earth pressure becomes large. Further, when the pressure receiving plate 7 is attached to the same position on each of the main piles 2, the concrete sheet pile 3 is lowered so as to be in contact with the upper end of the pressure receiving plate 7, so that the positioning when installing the concrete sheet pile 3 is easy. It becomes possible to do it. The pressure receiving plate 7 is attached to the main pile 2 by welding, for example, but the attachment method to the main pile 2 is not particularly limited. Further, the pressure receiving plate 7 is not limited to the plate-shaped member, and may be a member having a surface for receiving the passive earth pressure.

<Fifth Embodiment>
In the earth retaining wall 1 of the fifth embodiment shown in FIGS. 12 and 13, a cap concrete block 30 is provided at the upper end of the concrete sheet pile 3. The lower end of the cap concrete block 30 is placed on the upper end of the main pile 2. Since the main pile 2 and the concrete sheet pile 3 may be displaced independently until the installed earth retaining wall 1 becomes familiar with the ground, for example, both the main pile 2 and the concrete sheet pile 3 are connected by a cap concrete block. Then, a load is generated on the cap concrete block at the time of displacement, which may cause cracks and the like. On the other hand, as in the fifth embodiment, the position of the upper end of the concrete sheet pile 3 is set higher than the position of the upper end of the main pile 2, and the cap concrete block 30 is provided so as to cover the upper end of the concrete sheet pile 3. , The main pile 2 and the concrete sheet pile 3 can be prevented from being connected, and the occurrence of cracks and the like can be suppressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to.

For example, a water-expandable sealing material (not shown) may be provided between the main pile 2 and the concrete sheet pile 3. As a result, it is possible to suppress the suction of earth and sand on the back side of the earth retaining wall 1. When the water-expandable sealing material is provided, it is preferable to provide it between the flange 2b on the front surface side of the main pile 2 and the second protruding portion 3b of the concrete sheet pile 3. Further, a bag body (not shown) may be provided between the main pile 2 and the concrete sheet pile 3 at the time of construction, and the grout material may be injected into the bag body after the concrete sheet pile 3 is installed. In this case as well, it is possible to suppress the suction of earth and sand on the back side of the earth retaining wall 1. When the bag body is provided, it is preferable to provide it between the flange 2b on the front surface side of the main pile 2 and the second protruding portion 3b of the concrete sheet pile 3. Furthermore, when installing the bag body, the bag body is covered with a protective material such as steel or resin so that the bag body will not be damaged during construction, and the protective material is applied at the stage of injecting the grout material. You may pull it out.

Further, the shape of the concrete sheet pile 3 is not limited to that described in the first to fifth embodiments. For example, in the first to fifth embodiments, the entire concrete sheet pile 3 is made of concrete, but as shown in FIG. 14, the first protruding portion 3a of the concrete sheet pile 3 is not concrete but a steel material or the like. It may be composed of other members. In the example shown in FIG. 14, the first protruding portion 3a is formed by fixing the L-shaped angle steel (angle) to the main body of the concrete sheet pile 3 with bolts or the like. Further, for example, as shown in FIG. 15, the first protruding portion 3a may be formed by fixing the flat steel to the main body of the concrete sheet pile 3 with bolts or the like. That is, as long as the first protruding portion 3a is configured to be located inside the flange 2b of the main pile 2, the configuration of the first protruding portion 3a is not particularly limited. Further, in FIGS. 14 and 15, of the two first protrusions 3a formed at both ends of the concrete sheet pile 3 in the width direction, only one of the first protrusions 3a is made of steel. , Both first protrusions 3a may be made of steel. In other words, at least one of the first projecting portions 3a formed at both ends in the width direction of the concrete sheet pile 3 may be made of a steel material.

Further, in the first to fifth embodiments, the second protruding portion 3b that covers the entire exposed portion of the main pile 2 is provided only on one side of the concrete sheet pile 3 in the width direction W. For example, both sides of the width direction W are provided. A second protrusion 3b may be provided on the surface. Here, when a concrete sheet pile in which the second protruding portion 3b is formed on both sides in the width direction W is referred to as a first concrete sheet pile, the second concrete sheet pile installed next to the first concrete sheet pile is a parent. It is sufficient that only the first protruding portion 3a that is hooked on the inside of the flange 2b of the pile 2 is formed. By doing so, the earth retaining wall 1 can be constructed by alternately installing the first concrete sheet pile and the second concrete sheet pile between the adjacent parent piles 2.

In either case, if the concrete sheet pile 3 has a shape that covers the entire exposed portion of the main pile 2 in the above-ground portion that is not embedded in the ground, the appearance quality and durability of the earth retaining wall 1 can be improved. .. The concrete sheet pile member installed between the adjacent parent piles 2 is not limited to the plate-shaped member.

The present invention can be applied to earth retaining walls required for construction of waterways, roads, and the like.

1 Retaining wall 2 Main pile 2a Web 2b Flange 3 Concrete sheet pile 3a First protruding part 3b Second protruding part 4 Gap 5 Fastener 6 Work hole 7 Pressure receiving plate 10 Formwork 11 H-shaped steel 12 Vertical restraint jig 12a Formwork component 12b Formwork component 13 Width direction restraint jig 13a Formwork component 13b Formwork component 14 Spacer 20 Guide member 30 Cap concrete block GL1 Front side of earth retaining wall Ground surface GL2 Back of earth retaining wall Side ground surface V Direction perpendicular to the width direction in plan view W Width direction

Claims (16)

A concrete sheet pile member installed between adjacent parent piles of a retaining wall having a plurality of parent piles made of steel having flanges at both ends of the web.
A first projecting portion extending in the width direction at both ends in the width direction of the concrete sheet pile member so as to be located inside the flange of the parent pile when installed between the adjacent parent piles.
At least of both ends in the width direction of the concrete sheet pile member so as to cover the entire front side width of the front side flange of the exposed parent pile that is not embedded in the ground when installed between the adjacent parent piles. It has a second protrusion extending in the width direction at one end and has a second protrusion.
A concrete sheet pile member in which the protruding length of the second protruding portion is longer than the width of the front side surface of the front side flange of the parent pile . The concrete sheet pile member according to claim 1, wherein at least one of the first protruding portions formed at both ends in the width direction of the concrete sheet pile member is made of a steel material. The concrete sheet pile member according to claim 1 or 2, which has a shape such that a gap is provided between the parent pile and the concrete sheet pile member to absorb a construction error in the width direction of the parent pile. An earth retaining wall including a main pile made of steel having flanges at both ends of the web and the concrete sheet pile member according to any one of claims 1 to 3.
A plurality of the parent piles are installed at intervals so that the flange surface is parallel to the width direction of the retaining wall.
The concrete sheet pile member is installed between the adjacent master piles so that the flange on the front surface side of the master pile is located between the first protrusion and the second protrusion. wall. The earth retaining wall according to claim 4, wherein adjacent concrete sheet pile members are connected to each other by fasteners. The earth retaining wall according to claim 4 or 5, wherein a guide member in contact with a surface on the back surface side of the first projecting portion is provided on the web of the parent pile. The earth retaining wall according to any one of claims 4 to 6, wherein a pressure receiving member for receiving passive earth pressure is provided at the lower end of the concrete sheet pile member at the rooting portion of the parent pile. The earth retaining wall according to any one of claims 4 to 7, wherein a water-expandable sealing material is provided between the main pile and the concrete sheet pile member. The earth retaining wall according to any one of claims 4 to 7, wherein a bag body in which a grout material is injected is provided between the main pile and the concrete sheet pile member. A method for constructing a retaining wall including a main pile made of a steel material having flanges at both ends of a web and a concrete sheet pile member according to any one of claims 1 to 3.
A plurality of the parent piles are installed at intervals so that the flange surface is parallel to the width direction of the retaining wall.
The earth retaining wall is provided by installing the concrete sheet pile member between the adjacent parent piles so that the flange on the front surface side of the parent pile is located between the first protrusion and the second protrusion. How to build a retaining wall. Using a well-shaped formwork,
The master pile is installed while restraining the position of the master pile in the width direction and the position of the master pile in the vertical direction which is the direction perpendicular to the width direction in a plan view.
The method for constructing an earth retaining wall according to claim 10, wherein the earth retaining wall is constructed by installing the concrete sheet pile member while restraining the position of the concrete sheet pile member in the vertical direction. A guide member is provided on the web of the parent pile in contact with the back surface of the first protrusion.
The parent pile provided with the guide member is installed, and the main pile is installed.
10. The earth retaining wall is constructed by installing the concrete sheet pile member so as to insert the first protruding portion between the flange on the front surface side of the main pile and the guide member. Or the method for constructing a retaining wall according to 11. The method for constructing an earth retaining wall according to any one of claims 10 to 12, wherein adjacent concrete sheet pile members are connected to each other with fasteners. A pressure receiving member for receiving passive earth pressure is attached to the rooting portion of the parent pile, the parent pile is embedded in the ground, and the concrete sheet pile member is installed so as to be in contact with the upper end of the pressure receiving member. The method for constructing a retaining wall according to any one of claims 10 to 13, wherein the retaining wall is constructed. The method for constructing a retaining wall according to any one of claims 10 to 14, wherein a water-expandable sealing material is provided between the main pile and the concrete sheet pile member. The method for constructing a retaining wall according to any one of claims 10 to 14, wherein a bag body is provided between the parent pile and the concrete sheet pile member, and a grout material is injected into the bag body.

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