Support structure

Abstract

To provide a support structure allowing installation capability to be enhanced.SOLUTION: A first support structure 60 is a support structure for supporting a first soil retaining member 31 constructed in an excavation area 11, being provided with a first pile body 61 installed in a side of the first excavation area 11 inner than the first soil retaining member 31 and a first beam member 62 connecting the first retaining member 31 and the first pile body 61, and further provided with first reinforcement bodies 63 for reinforcing the first pile body 61, being the first reinforcement bodies 63 buried around the first pile body 61.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention provides support structure Regarding. [Background technology]

[0002] Conventionally, one technique proposed for supporting retaining members installed on the wall surface of an excavation area is to install beam members connected to a first steel sheet pile supported on one wall surface of the excavation area and a second steel sheet pile supported on the wall surface opposite to the one wall surface of the excavation area (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-188062 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional technology, as described above, the provision of a beam between the first steel sheet pile and the second steel sheet pile may cause the following problems. That is, the beam may make it difficult to secure working space, such as vehicle access space, which may reduce workability in or near the excavation area. In addition, the length of the beam increases the material cost of the beam, which may increase the installation cost of the support structure such as the above-mentioned technology. Furthermore, the length of the beam may increase the amount of expansion and contraction of the beam due to temperature (thermal) stress, which may make it difficult to stably support the first steel sheet pile and the second steel sheet pile. Therefore, there is room for improvement in terms of improving the installability of the support structure.

[0005] The present invention has been made in view of the above, Support structure This allows for improved installation, support structure The purpose is to provide. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the present invention provides a method for manufacturing a semiconductor device according to claim 1. support structure is a retaining member constructed in an excavation area. and the retaining member a support structure for supporting the and a support structure comprising: And, The support structure includes: The pile body is provided with a pile body driven inside the excavation area relative to the retaining member, and a beam material connecting the retaining member and the pile body, and in a state in which the retaining member is constructed in the excavation area so that the upper end of the retaining member is approximately flush with the surface of the excavation area, the pile body is configured so that when the pile body is driven into the excavation area, the upper end of the pile body is approximately flush with the surface of the excavation area and the lower end of the pile body is located in a stratum that can stably support the pile body.

[0007] The method according to claim 2 support structure is as claimed in claim 1 support structure In The support structure includes: The pile body further includes a reinforcing body buried around the pile body for reinforcing the pile body, the reinforcing body including a root fixing body formed with a root fixing liquid, the vertical length of the pile body being longer than the vertical length of the retaining member, the vertical length of the root fixing body being shorter than the vertical length of the pile body, and the root fixing body being buried so that the lower end of the root fixing body is positioned lower than the lower end of the pile body.

[0008] The method according to claim 3 support structure is as claimed in claim 1 or 2 support structure In this case, the beam is provided at an incline so that the end of the beam on the pile body side is positioned lower than the end of the beam on the retaining member side. [Effects of the Invention]

[0010] The method according to claim 1 support structure According to The support structure includes: Since the system includes piles driven into the excavation area further inward than the earth retaining members and beams connecting the earth retaining members and the piles, the length of the beams can be shortened compared to conventional technology (technology in which beams are installed between the first steel sheet pile and the second steel sheet pile). This makes it easier to secure work space within the excavation area (e.g., space for the traffic flow of transport vehicles, space for the construction of gantry or preceding structures, etc.), thereby improving workability in or near the excavation area. It also reduces the material costs of the beams and the installation costs of the support structure. Furthermore, it is possible to prevent excessive expansion and contraction of the beams due to temperature (thermal) stress, ensuring stable support for the earth retaining members. These factors contribute to improving the installability of the support structure.

[0011] The method according to claim 2 support structure According to the present invention, the reinforcing body is buried around the pile body and further includes a reinforcing body for reinforcing the pile body, so that the pile body can be firmly supported and the retaining member can be easily supported stably. Furthermore, since the reinforcement body includes a foot protection body formed with a foot protection liquid, the reinforcement body can be configured with a foot protection body depending on the ground conditions, improving the workability of the reinforcement body. For example, when the reinforcement body is to be formed in a relatively hard stratum, configuring the reinforcement body with a foot protection body makes it relatively easy to form the reinforcement body.

[0012] The method according to claim 3 support structure According to the method, the beam is tilted so that the end of the beam on the pile body side is positioned lower than the end of the beam on the retaining member side. This makes it possible to suppress the application of unfavorable forces to the retaining member (such as forces that cause the retaining member to float upward) compared to when the beam is positioned horizontally, making it easier to stably support the retaining member. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a plan view conceptually showing a construction area 1 according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 (partially omitted). [Figure 3]2 is a cross-sectional view taken along the arrow BB in FIG. 1 (partially omitted). [Figure 4] FIG. 10 is a diagram showing the pile and reinforcement body installation process of the first support structure construction method, and shows the area corresponding to the diagram. [Figure 5] FIG. 3 is a diagram showing the first root cutting step of the construction method for the first support structure, and shows the area corresponding to FIG. 2. [Figure 6] FIG. 3 is a diagram showing the second root cutting step of the construction method for the first support structure, and shows the area corresponding to FIG. 2. [Figure 7] FIG. 3 is a diagram showing a beam installation step of the construction method for the first support structure, showing the area corresponding to FIG. 2. [Figure 8] FIG. 3 is a diagram showing the third root cutting step of the construction method for the first support structure, and shows the area corresponding to FIG. 2. [Figure 9] FIG. 4 is a diagram showing the pile and reinforcement body installation step of the construction method for the second support structure, and shows the area corresponding to FIG. 3. [Figure 10] FIG. 4 is a diagram showing the first root cutting step of the construction method for the second support structure, and shows the area corresponding to FIG. 3. [Figure 11] FIG. 4 is a diagram showing the second root cutting step of the construction method for the second support structure, and shows the area corresponding to FIG. 3. [Figure 12] FIG. 4 is a diagram showing the beam installation step of the construction method for the second support structure, showing the area corresponding to FIG. 3. [Figure 13] FIG. 4 is a diagram showing the third root cutting step of the construction method for the second support structure, and shows the area corresponding to FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention will be described below with reference to the accompanying drawings. support structure The following describes in detail the embodiments of the present invention. First, [I] the basic concept of the embodiments will be explained, then [II] the specific contents of the embodiments will be explained, and finally, [III] modifications to the embodiments will be explained. However, the present invention is not limited to the embodiments.

[0016] [I] Basic Concept of the Embodiment First, the basic concept of the embodiment will be described. The embodiment is generally a structure for supporting an earth retaining member constructed in an excavation area. support structure Regarding.

[0017] Here, "excavation area" refers to an area where the ground is excavated to secure space for installing a structure (for example, an architectural structure (e.g., an apartment building, public facility, commercial facility, etc.), or a civil engineering structure (e.g., a railway bridge, a road bridge, etc.)). Also, "retaining member" refers to a member that prevents the ground around the excavation area from collapsing after the excavation area has been formed.

[0018] [II] Specific details of the embodiment Next, specific details of the embodiment will be described.

[0019] (composition) First, the configuration of the support structure 50 according to the embodiment, the configuration of the earth retaining member 30 supported by the support structure 50, and the configuration of the construction area 1 to which the support structure 50 is applied will be described.

[0020] (Configuration-Construction area) First, the configuration of the construction area 1 will be described. Fig. 1 is a plan view conceptually showing the construction area 1 according to an embodiment of the present invention. Fig. 2 is a cross-sectional view taken along the line AA in Fig. 1 (partially omitted). Fig. 3 is a cross-sectional view taken along the line BB in Fig. 1 (partially omitted). In the following description, the X direction in Fig. 1 is referred to as the left-right direction of the construction area 1 (the -X direction is the left direction of the construction area 1, and the +X direction is the right direction of the construction area 1), the Y direction in Fig. 1 is referred to as the front-to-back direction of the construction area 1 (the +Y direction is the front direction of the construction area 1, and the -Y direction is the rear direction of the construction area 1), and the Z direction in Fig. 2 is referred to as the up-down direction of the construction area 1 (the +Z direction is the upward direction of the construction area 1, and the -Z direction is the downward direction of the construction area 1).

[0021] The construction area 1 is an area where a structure (not shown) is constructed, and is roughly divided into a first construction area 10 and a second construction area 20, as shown in FIG.

[0022] (Configuration - Construction area - 1st construction area) The first construction area 10 is the area where the first support structure 60 described later is installed, and as shown in Figure 1, is located behind the construction area 1 and is divided into a first excavation area 11 and a first non-excavation area 12.

[0023] Here, the specific configuration of the ground in the first construction area 10 is arbitrary, but in this embodiment, as shown in Figure 2, it is configured to include a first construction side ground surface layer 10a, a first construction side first silt layer 10b, a first construction side second silt layer 10c, a first construction side first clay layer 10d, and a first construction side second clay layer 10e. Of these, the first construction side ground surface layer 10a is the uppermost layer and is configured to contain, for example, clayey fine sand. The first construction side first silt layer 10b is a layer located below the first construction side ground surface layer 10a and is configured to contain, for example, sand and silt. The first construction side second silt layer 10c is located below the first construction side first silt layer 10b and is a hard layer and is configured to contain, for example, silt. The first construction side first clay layer 10d is located below the first construction side second silt layer 10c and is a hard stratum, for example, including sand and clay lumps (hard clay lumps). The first construction side second clay layer 10e is located below the first construction side first clay layer 10d and is a hard stratum, for example, including clay (hard clay) (this corresponds to the so-called supporting layer of the first pile body 61 described later).

[0024] (Configuration - Construction area - 1st construction area - 1st excavation area) Returning to Figure 1, the first excavation area 11 is the area of ​​the first construction area 10 where the ground is excavated. As shown in Figure 1, this first excavation area 11 is located more inward of the construction area 1 than the first non-excavation area 12, and is formed so that the ground surface of the first excavation area 11 is lower than the ground surface of the first non-excavation area 12 by excavating the ground in the first excavation area 11.

[0025] Furthermore, the specific shape and size of this first excavation area 11 are arbitrary, but in this embodiment they are set as follows. That is, the planar shape of the first excavation area 11 is set to be approximately rectangular. Furthermore, the left-right length of the first excavation area 11 is set to be shorter than the left-right length of the first construction area 10, as shown in Figure 1, and the front-rear length of the first excavation area 11 is set to be shorter than the front-rear length of the first construction area 10.

[0026] (Configuration - Construction area - 1st construction area - 1st non-excavation area) The first non-excavation area 12 is an area in the first construction area 10 where the ground is not excavated. The first non-excavation area 12 is located further outside the construction area 1 than the first excavation area 11, as shown in FIG.

[0027] Furthermore, the specific shape and size of this first non-excavation area 12 are arbitrary, but in this embodiment they are set as follows. That is, the planar shape of the first non-excavation area 12 is set to be approximately U-shaped. Furthermore, the left-right length of the first non-excavation area 12 is set to be approximately the same as the left-right length of the first construction area 10, as shown in FIG. 1, and the front-rear length of the first non-excavation area 12 is set to be approximately the same as the front-rear length of the first construction area 10. Furthermore, the width of the first non-excavation area 12 is set to be shorter than the front-rear length of the first excavation area 11, as shown in FIGS. 1 and 2.

[0028] (Configuration-Construction area-Second construction area) Returning to Figure 1, the second construction area 20 is the area where the second support structure 70 described later is installed, and as shown in Figure 1, it is located in front of the construction area 1 and is divided into a second excavation area 21 and a second non-excavation area 22.

[0029] Here, the specific configuration of the ground in the second construction area 20 is arbitrary, but in this embodiment, as shown in FIG. 3, it is configured to include a second construction side first ground surface layer 20a, a second construction side second ground surface layer 20b, a second construction side first silt layer 20c, a second construction side second silt layer 20d, a second construction side third silt layer 20e, a second construction side fourth silt layer 20f, and a second construction side clay layer 20g. Of these, the second construction side first ground surface layer 20a is the topmost layer and is configured to include, for example, clayey fine sand. The second construction side second ground surface layer 20b is located in the second construction side first ground surface layer 20a and is a hard layer and is configured to include, for example, sand and clay blocks. The second construction side first silt layer 20c is a layer located below the second construction side second ground surface layer 20b and is configured to include, for example, sand and silt. The second construction side second silt layer 20d is located below the second construction side first silt layer 20c and is a hard stratum, for example, containing silt. The second construction side third silt layer 20e is located below the second construction side second silt layer 20d and is a hard stratum, for example, containing silty fine sand. The second construction side fourth silt layer 20f is located below the second construction side third silt layer 20e and is a hard stratum, for example, containing hard silt (corresponding to the so-called supporting layer of the second pile body 71 described below). The second construction side red clay layer 20g is located below the second construction side fourth silt layer 20f and is a hard stratum, for example, containing red clay.

[0030] (Configuration - Construction area - 2nd construction area - 2nd excavation area) Returning to Figure 1, the second excavation area 21 is an area in the second construction area 20 where the ground is excavated. As shown in Figure 1, this second excavation area 21 is located more inward than the second non-excavation area 22 in the construction area 1, and is formed so that the ground surface of the second excavation area 21 is lower than the ground surface of the second non-excavation area 22 by excavating the ground in the second excavation area 21.

[0031] Furthermore, the specific shape and size of this second excavation area 21 are arbitrary, but in this embodiment they are set as follows. That is, the planar shape of the second excavation area 21 is set to be approximately rectangular. Furthermore, the left-right length of the second excavation area 21 is set to be shorter than the left-right length of the second construction area 20, as shown in Figure 1, and the front-rear length of the second excavation area 21 is set to be shorter than the front-rear length of the second construction area 20.

[0032] (Configuration - Construction area - 2nd construction area - 2nd non-excavation area) The second non-excavation area 22 is an area in the second construction area 20 where the ground is not excavated. The second non-excavation area 22 is located further outside the construction area 1 than the second excavation area 21, as shown in FIG.

[0033] Furthermore, the specific shape and size of this second non-excavation area 22 are arbitrary, but in this embodiment they are set as follows. That is, the planar shape of the second non-excavation area 22 is set to be approximately U-shaped. Furthermore, the left-right length of the second non-excavation area 22 is set to be approximately the same as the left-right length of the second construction area 20, as shown in Fig. 1, and the front-rear length of the second non-excavation area 22 is set to be approximately the same as the front-rear length of the second construction area 20. Furthermore, the width of the second non-excavation area 22 is set to be shorter than the front-rear length of the second excavation area 21, as shown in Figs. 1 and 3.

[0034] (Configuration - Earth retaining member) Next, the configuration of the earth retaining member 30 will be described. The earth retaining member 30 is a member for reinforcing the ground in the first non-excavation area 12 or the second non-excavation area 22. This earth retaining member 30 is constructed using, for example, a known earth retaining material (one example is a long steel sheet pile (so-called sheet pile) with a roughly U-shaped planar shape), and as shown in FIG. 1 , a plurality of earth retaining members 30 are embedded continuously using a known construction method in the periphery of the first excavation area 11 on the first non-excavation area 12 side and in the periphery of the second excavation area 21 on the second non-excavation area 22 side. Note that, hereinafter, of the earth retaining members 30, the earth retaining member 31 provided in the first excavation area 11 will be referred to as the "first earth retaining member 31," and the earth retaining member 32 provided in the second excavation area 21 will be referred to as the "second earth retaining member 32."

[0035] The first and second earth retaining members 31 and 32 can be buried in any manner as long as they can be stably supported. In this embodiment, however, they are buried as follows. That is, as shown in FIG. 2, the first earth retaining member 31 is buried so that its lower end is located in the second silt layer 10e on the first construction side. As shown in FIG. 3, the second earth retaining member 32 is buried so that its lower end is located in the fourth silt layer 20f on the second construction side. This allows the first and second earth retaining members 31 and 32 to be located in a relatively hard stratum, enabling stable support for the first and second earth retaining members 31 and 32.

[0036] (Configuration-Support Structure) Returning to Fig. 1, next, the configuration of the support structure 50 will be described. The support structure 50 is for supporting the earth retaining member 30, and as shown in Fig. 1, includes a first support structure 60 and a second support structure 70.

[0037] (Configuration - Support structure - 1st support structure) The first support structure 60 is intended to support the first retaining member 31, and as shown in Figure 1, multiple structures are arranged side by side in the left-right direction in the first excavation area 11, and comprises a first pile body 61, a first beam member 62, and a first reinforcing body 63.

[0038] (Configuration - Support structure - 1st support structure - 1st pile body) The first pile body 61 is a pile body that is part of the basic structure of the first support structure 60. This first pile body 61 is formed as a long body, and is driven into the first excavation area 11 more inward than the first earth retaining member 31 by a known construction method. Specifically, as shown in FIG. 2, it is buried so as to be exposed outside the first pile body 61 at a position a predetermined distance away from the first earth retaining member 31. In this embodiment, the predetermined distance is set to be shorter than the length of the first excavation area 11 in the front-to-rear direction.

[0039] The specific shape and length of the first pile body 61 can be arbitrarily configured as long as it can support the first earth retaining member 31 via the first beam 62. In this embodiment, however, it is configured as follows. That is, the planar shape of the first pile body 61 is set to be H-shaped as shown in FIG. 1 . However, this is not limited to this, and the shape may be, for example, a non-annular shape other than an H-shape (e.g., circular or rectangular) or annular (e.g., circular or rectangular annular). The left-right length of the first pile body 61 is set to be shorter (or longer or the same) as the left-right length of the first earth retaining member 31 as shown in FIG. 1 . The front-rear length of the first pile body 61 is set to be longer than the front-rear length of the first earth retaining member 31 as shown in FIG. 1 . The up-down length of the first pile body 61 is set to be longer (or shorter or the same) as the up-down length of the first earth retaining member 31 as shown in FIG. 2 . The method for calculating the above-mentioned various lengths of the first pile body 61 is arbitrary, but for example, it is desirable to calculate them assuming that the bending moment and shear force acting on the first pile body 61 and the first reinforcing body 63 are borne by the first pile body 61 alone.

[0040] The first pile body 61 can be embedded in any manner as long as it can be stably supported. In this embodiment, as shown in FIG. 2, the first pile body 61 is embedded so that its lower end is located in the first construction-side second clay layer 10e. More specifically, the first pile body 61 is embedded so that its lower end is located lower than the lower end of the first earth retaining member 31. Here, the length of the portion of the first pile body 61 embedded in the first construction-side second clay layer 10e (so-called embedded length) can be calculated in any manner. However, for example, as described below, if the strength of the first reinforcing body 63 is set to be substantially the same as the strength of the first construction-side first clay layer 10d, it is desirable to calculate the length taking into account the bending rigidity of the first pile body 61 and the bending rigidity of the first reinforcing body 63. This embedding method allows the first pile body 61 to be located in a relatively hard stratum, enabling stable support of the first pile body 61.

[0041] In addition, in the embodiment, the first pile body 61 is specifically configured using a steel pile (for example, a pile made of H-shaped steel). However, the first pile body 61 is not limited to this, and may be configured using, for example, an RC pile, a PHC pile, or a PRC pile (the same applies to the second pile body 71 described later).

[0042] (Configuration - Support structure - 1st support structure - 1st beam) The first beam 62 is a beam that is another part of the basic structure of the first support structure 60. This first beam 62 is made of, for example, a known long beam (a steel beam, for example), and as shown in Fig. 2, is provided by connecting the first earth retaining member 31 (the upper part of the first earth retaining member 31) and the first pile body 61 (the upper part of the first pile body 61) with fasteners, welding, or the like, and specifically, is provided so that a predetermined amount of axial force (for example, an axial force of about 15% of the allowable axial force of the first beam 62) acts on the first beam 62.

[0043] Furthermore, the specific shape and length of the first beam 62 can be configured arbitrarily as long as it can support the first earth retaining member 31, but in this embodiment, it is configured as follows. That is, the cross-sectional shape of the first beam 62 is set to be H-shaped as shown in FIG. 1. However, it is not limited to this, and may be set to, for example, a non-annular shape other than an H-shape (e.g., circular, rectangular, etc.) or annular (e.g., circular annular, rectangular annular). Furthermore, the longitudinal length of the first beam 62 is set to be longer than the above-mentioned predetermined distance as shown in FIG. 2. Furthermore, the width and height of the first beam 62 are set to be shorter (or longer or the same) than the left-right length of the first pile body 61 as shown in FIGS. 1 and 2.

[0044] Furthermore, the first beam 62 may be installed in any manner. In this embodiment, as shown in FIG. 2, the first beam 62 is installed at an incline so that the end of the first beam 62 facing the first pile 61 is positioned lower than the end of the first beam 62 facing the first earth retaining member 31. Specifically, the first beam 62 is installed so that the end of the first beam 62 facing the first pile 61 corresponds to the upper portion of the first construction-side first silt layer 10b, and the end of the first beam 62 facing the first earth retaining member 31 corresponds to the upper portion of the first construction-side earth surface layer 10a. The inclination angle of the first beam 62 is preferably set to an angle that prevents the first earth retaining member 31 from floating upward (the same applies to the inclination angle of the second beam 72, described below). This installation method makes it possible to prevent unfavorable forces from acting on the first retaining member 31 (such as forces that cause the first retaining member 31 to float upward) compared to when the first beam member 62 is positioned horizontally, making it easier to support the first retaining member 31 stably.

[0045] (Configuration - Support structure - 1st support structure - 1st reinforcement body) The first reinforcing body 63 is a reinforcing body for reinforcing the first pile body 61. The first reinforcing body 63 is formed as a long body and is embedded around the periphery of the first pile body 61 by a known construction method. Specifically, as shown in FIG. 2, the axis of the first reinforcing body 63 and the axis of the first pile body 61 are arranged so as to substantially coincide with each other.

[0046] Furthermore, the specific shape and length of the first reinforcing body 63 can be configured arbitrarily as long as it can reinforce the first pile body 61, but in this embodiment, it is configured as follows. That is, the planar shape of the first reinforcing body 63 is set to be approximately circular as shown in FIG. 1. However, it is not limited to this, and may be set to, for example, a polygonal shape (e.g., rectangular), an elliptical shape, or a circular shape. Furthermore, the left-right length of the first reinforcing body 63 is set to be longer than the left-right length of the first pile body 61 as shown in FIG. 1. Furthermore, the front-rear length of the first reinforcing body 63 is set to be longer than the front-rear length of the first pile body 61 as shown in FIG. 1. Furthermore, the up-down length of the first reinforcing body 63 is set to be shorter than (or the same as) the up-down length of the first pile body 61 as shown in FIG. 2.

[0047] Furthermore, the first reinforcing body 63 can be buried in any manner as long as it can reinforce the first pile body 61. In this embodiment, as shown in Figure 2, the first reinforcing body 63 is buried so that its lower end is located in the first construction-side second clay layer 10e. More specifically, the first reinforcing body 63 is buried so that its lower end is located lower than the lower end of the first pile body 61 (however, the upper end of the first reinforcing body 63 and its neighboring parts are positioned so that they are exposed to the outside). This burying method allows the first reinforcing body 63 to be located on the periphery of the first pile body 61, making it possible to reliably reinforce the first pile body 61.

[0048] Furthermore, in the embodiment, the first reinforcement body 63 is specifically configured using a foot reinforcement body formed with a foot reinforcement liquid (for example, a known foot reinforcement liquid containing cement milk, etc.). Furthermore, in the embodiment, the strength of this foot reinforcement body is set to be substantially the same as the strength of the first construction-side first clay layer 10d, but this is not limited thereto. For example, the strength may be set higher or lower. This makes it easier to form the first reinforcement body 63 in a relatively hard stratum such as the first construction-side second clay layer 10e than when the first reinforcement body 63 is formed with a ground improvement body (particularly because it is difficult to operate a ground improvement body forming device, described later, in a hard stratum). This improves the workability of the first reinforcement body 63.

[0049] The first support structure 60 described above allows the longitudinal length of the first beam 62 to be shorter than in the prior art (technique in which beams are provided between the first steel sheet pile and the second steel sheet pile). This makes it easier to secure work space (e.g., space for the traffic flow of transport vehicles, space for the construction of a platform or a structure to be constructed in advance, etc.) within the first excavation area 11, thereby improving workability in or near the first excavation area 11. This also reduces the material cost of the first beam 62 and the installation cost of the first support structure 60. Furthermore, excessive expansion and contraction of the first beam 62 due to temperature (thermal) stress can be avoided, enabling stable support of the first earth retaining member 31. These factors contribute to improving the installability of the first support structure 60. Furthermore, the first support structure 60 includes the first reinforcement body 63, which provides strong support for the first pile body 61 and facilitates stable support of the first earth retaining member 31.

[0050] The amount of displacement of the first retaining wall member 31 supported by the first support structure 60 is arbitrary, but from the standpoint of stability, it is desirable to calculate it based only on the bending rigidity of the first pile body 61, although, for example, an increase in the rigidity of the first reinforcing body 63 can be expected.

[0051] (Configuration-Support Structure-Second Support Structure) Returning to Figure 1, the second support structure 70 is intended to support the second retaining wall member 32, and as shown in Figure 1, multiple support structures 70 are arranged side by side in the left-right direction in the second excavation area 21, and include a second pile body 71, a second beam member 72, and second reinforcing bodies 73a, 73b.

[0052] (Configuration-Support structure-Second support structure-Second pile body) The second pile body 71 is a pile body that is part of the basic structure of the second support structure 70. This second pile body 71 is formed as a long body, and is driven into the second excavation area 21 closer to the second earth retaining member 32 by a known construction method. Specifically, as shown in Fig. 3, the second pile body 71 is buried so as to be exposed to the outside of the second pile body 71 at a position a predetermined distance away from the second earth retaining member 32. In this embodiment, the predetermined distance is set to be shorter than the length of the second excavation area 21 in the front-to-rear direction.

[0053] In this embodiment, the specific shape and length of the second pile body 71 are configured to be substantially the same as those of the first pile body 61. However, the vertical length of the second pile body 71 is set to be shorter than the vertical length of the second earth retaining member 32, as shown in Fig. 3. The method for calculating the various lengths of the second pile body 71 is arbitrary. However, for example, it is desirable to calculate the lengths of the second pile body 71 by assuming that the portion of the second pile body 71 above the upper end of the second construction-side first silt layer 20c is a composite member of the second pile body 71 and the second reinforcing body 73a, and that the portion of the second pile body 71 below the upper end of the second construction-side first silt layer 20c is a rigid-body displacement.

[0054] Regarding the method of embedding the second pile body 71, in the embodiment, as shown in Figure 3, the second pile body 71 is embedded so that its lower end is located in the second silt layer 20d on the second construction side, and more specifically, the second pile body 71 is embedded so that its lower end is located higher than the lower end of the second retaining member 32.

[0055] (Configuration-Support structure-Second support structure-Second beam) The second beam 72 is a beam that is another part of the basic structure of the second support structure 70. This second beam 72 is constructed using, for example, a known long beam (a steel beam, as an example), and as shown in Fig. 3, is provided so as to connect the second earth retaining member 32 (the upper part of the second earth retaining member 32) and the second pile body 71 (the upper part of the second pile body 71), and specifically, is provided so that a predetermined amount of axial force (for example, an axial force of about 15% of the allowable axial force of the second beam 72) acts on the second beam 72.

[0056] In addition, the specific shape and length of the second beam member 72 are configured to be substantially the same as those of the first beam member 62 in this embodiment.

[0057] Furthermore, the installation method of the second beam 72 is arbitrary, but in this embodiment, as shown in FIG. 3 , the second beam 72 is installed at an angle so that the end of the second beam 72 facing the second pile 71 is positioned lower than the end of the second beam 72 facing the second earth retaining member 32. Specifically, the second beam 72 is installed so that the end of the second beam 72 facing the second pile 71 corresponds to the upper portion of the second construction-side second earth surface layer 20b, and the end of the second beam 72 facing the second earth retaining member 32 corresponds to the upper portion of the second construction-side first earth surface layer 20a. This installation method can suppress the application of unfavorable forces (such as forces that would lift the second earth retaining member 32) to the second earth retaining member 32 compared to when the second beam 72 is installed horizontally, making it easier to stably support the second earth retaining member 32.

[0058] (Configuration-Support structure-Second support structure-Second reinforcement) The second reinforcing bodies 73a and 73b are reinforcing bodies for reinforcing the second pile body 71. These second reinforcing bodies 73a and 73b are formed as elongated bodies and are buried around the periphery of the second pile body 71 by a known construction method. Specifically, as shown in Fig. 3, the second reinforcing body 73a is buried so as to be located higher than the second reinforcing body 73b.

[0059] Furthermore, in the embodiment, the specific shape and length of the second reinforcing bodies 73a, 73b can be configured arbitrarily as long as they can reinforce the second pile body 71. In other words, the planar shape of the second reinforcing bodies 73a, 73b is set to be approximately rectangular as shown in FIG. 1 . However, this is not limited to this, and the second reinforcing bodies 73a, 73b may be set to be, for example, a polygonal shape other than rectangular (e.g., triangular), an elliptical shape, or a circular shape. Furthermore, the left-right length of the second reinforcing bodies 73a, 73b is set to be longer than the left-right length of the second pile body 71 as shown in FIG. 1 . Furthermore, the front-rear length of the second reinforcing bodies 73a, 73b is set to be longer than the front-rear length of the second pile body 71 as shown in FIG. 1 . Specifically, the front-rear length of the second reinforcing body 73b is set to be longer than the front-rear length of the second reinforcing body 73a and the front-rear length of the first reinforcing body 63. Furthermore, as shown in Figure 3, the total length of the second reinforcing bodies 73a and 73b in the vertical direction is set to be longer (or the same) than the vertical length of the second pile body 71, and specifically, the vertical length of the second reinforcing body 73b is set to be longer than the vertical length of the second reinforcing body 73a.

[0060] The second reinforcing bodies 73a and 73b can be buried in any manner as long as they reinforce the second pile body 71. In this embodiment, as shown in FIG. 3, the second reinforcing bodies 73b are buried so that their lower ends are located at the upper end of the second construction-side fourth silt layer 20f. More specifically, the second reinforcing bodies 73b are buried so that their lower ends are located higher than the lower end of the second pile body 71 (however, the second reinforcing body 73a is positioned so that it is exposed to the outside). This burying method allows the second reinforcing bodies to be located at the periphery of the second pile, thereby reliably reinforcing the second pile body 71. Furthermore, compared to burying the first reinforcing bodies 63, there is no need to excavate a relatively hard stratum such as the first construction-side second silt layer 10e, which improves the workability of the second reinforcing bodies 73a and 73b.

[0061] In addition, in the embodiment, the second reinforcement bodies 73a and 73b are specifically configured using a soil improvement body formed with a soil improvement material (for example, a known soil improvement material containing cement milk or cement slurry). In the embodiment, the strength of this soil improvement material is set higher than the strength of the second construction-side third silt layer 20e (however, to facilitate the formation of the soil improvement material, it is set lower than the strength of the first reinforcement body 63). As an example, the strength may be set to prevent the second earth retaining member 32 from being displaced (horizontally displaced) when the second earth retaining member 32 is supported by the second support structure 70. This makes it relatively easy to form the second reinforcement body 73b in a relatively soft stratum such as the second construction-side third silt layer 20e (i.e., a layer not supporting the second pile body 71), thereby improving the workability of the second reinforcement body 73b.

[0062] The second support structure 70 described above allows the longitudinal length of the second beam 72 to be shorter than in the conventional technology. This makes it easier to secure a working space within the second excavation area 21, thereby improving workability in or near the second excavation area 21. This also reduces the material cost of the second beam 72, thereby reducing the installation cost of the second support structure 70. Furthermore, excessive expansion and contraction of the second beam 72 due to temperature (thermal) stress can be avoided, ensuring stable support for the second earth retaining member 32. These factors contribute to improving the installability of the second support structure 70. Furthermore, since the second support structure 70 includes the second reinforcing members 73a and 73b, it can firmly support the second pile body 71, making it easier to stably support the second earth retaining member 32.

[0063] The amount of displacement of the second retaining wall member 32 supported by the second support structure 70 is arbitrary, but it is desirable to calculate it based on, for example, the bending rigidity and shear rigidity of the part of the second pile body 71 above the upper end of the first silt layer 20c on the second construction side and the second reinforcing body 73a, and the bending rigidity and shear rigidity of the second reinforcing body 73b.

[0064] (Support structure construction method) Next, construction methods for forming the above-described first support structure 60 and second support structure 70 will be described.

[0065] (Support structure construction method - First support structure construction method) First, the construction method of the first support structure 60 will be described. Fig. 4 is a diagram showing the pile and reinforcement body installation process of the construction method of the first support structure 60, and is a diagram showing the area corresponding to Fig. 2. Fig. 5 is a diagram showing the first root cutting process of the construction method of the first support structure 60, and is a diagram showing the area corresponding to Fig. 2. Fig. 6 is a diagram showing the second root cutting process of the construction method of the first support structure 60, and is a diagram showing the area corresponding to Fig. 2. Fig. 7 is a diagram showing the beam material installation process of the construction method of the first support structure 60, and is a diagram showing the area corresponding to Fig. 2. Fig. 8 is a diagram showing the third root cutting process of the construction method of the first support structure 60, and is a diagram showing the area corresponding to Fig. 2.

[0066] The construction method for the first support structure 60 generally includes a pile and reinforcing body installation process, a first root cutting process, a second root cutting process, a beam installation process, a third root cutting process, and a skeleton installation and removal process. Note that the construction method for the first support structure 60 will be described on the assumption that the first earth retaining member 31 has already been buried in the first excavation area 11.

[0067] (Support structure construction method - First support structure construction method - Pile and reinforcement body installation process) First, the pile and reinforcement body installation step will be described. The pile and reinforcement body installation step is a step of installing the first pile body 61 and the first reinforcement body 63.

[0068] Specifically, a drilling rod (not shown) of a known excavation device is used to drill a borehole in the first excavation region 11 at a predetermined distance from the first earth retaining member 31. More specifically, the borehole is drilled so that its lower end is located in the first construction-side second silt layer 10e. Next, a first reinforcement body 63 is formed by injecting a foot-reinforcing fluid from a jetting unit attached to the drilling rod of the excavation device. More specifically, the first reinforcement body 63 is formed by filling the portion from the lower end of the borehole to the upper portion of the first construction-side first silt layer 10b with the foot-reinforcing fluid. Next, as shown in FIG. 4 , before the foot-reinforcing fluid hardens, the first pile body 61 is inserted into the borehole using a crane or the like to bury the first pile body 61. More specifically, the position or inclination of the first pile body 61 is adjusted using an adjustable platform or the like, and the adjusted position or inclination of the first pile body 61 is maintained until the foot-reinforcing fluid hardens.

[0069] (Support structure construction method - First support structure construction method - First root cutting process) Next, the first root cutting step will be described. The first root cutting step is a step of cutting the ground to ensure an installation space for the first beam 62 after the pile and reinforcing body installation step.

[0070] Specifically, as shown in Figure 5, using a known excavation device, etc., the ground in the first construction side surface layer 10a of the first excavation area 11 is excavated in the range from the first retaining wall member 31 to the boundary between the first excavation area 11 and the second excavation area 21, thereby performing root cutting.

[0071] (Support structure construction method - First support structure construction method - Second root cutting process) Next, the second root cutting step will be described. The second root cutting step is a step of cutting the ground to further secure the installation space of the first beam 62 after the first root cutting step.

[0072] Specifically, as shown in Fig. 6, the above-mentioned excavation equipment or the like is used to excavate the ground around the first pile body 61 in the first construction side surface layer 10a and the first construction side first silt layer 10b of the first excavation area 11, thereby performing root cutting. Furthermore, with regard to this excavation method, excavation can be performed in any manner as long as the ground that would be an obstacle when installing the first beam material 62 is removed, but for example, as shown in Fig. 6, excavation may be performed so that the excavation range narrows downward.

[0073] (Support structure construction method - First support structure construction method - Beam installation process) Next, the beam installation step will be described. The beam installation step is a step of installing the first beam 62 after the second root cutting step.

[0074] Specifically, as shown in Figure 7, it is installed by being placed between the first retaining member 31 and the first pile body 61 and connected to the first retaining member 31 and the first pile body 61 by means of fasteners or welding, etc., and more specifically, it is installed so that the above-mentioned specified amount of axial force acts on the first beam member 62.

[0075] (Support structure construction method - 1st support structure construction method - 3rd root cutting process) Next, the third root cutting step will be described. The third root cutting step is a step of cutting the ground to secure an installation space for the first skeleton 81, which will be described later, after the beam installation step.

[0076] Specifically, as shown in Figure 8, the above-mentioned excavation equipment, etc. is used to excavate the ground in the first excavation area 11 from the first construction side surface layer 10a to the first construction side first silt layer 10d, including the ground in the range from the first retaining wall member 31 to the first pile body 61 and the ground in the range from the first pile body 61 to the boundary between the first excavation area 11 and the second excavation area 21, thereby performing root cutting (however, from the standpoint of stability of the first support structure 60, with regard to the ground surrounding the first pile body 61, only a portion of the first construction side first silt layer 10b is excavated).

[0077] (Support structure construction method - First support structure construction method - Body installation and removal process) Next, the skeleton installation and removal process will be described. The skeleton installation and removal process is a process of installing the first skeleton 81 and removing the first beam material 62 after the third root cutting process.

[0078] Specifically, as shown in Figure 2, a first structure 81 (for example, flooring, pillars, etc.) is installed in the portion of the first excavation area 11 that has been cut in the third cutting step. Thereafter, when the first earth retaining member 31 is supported by the installed first structure 81, etc., the first beam 62 is removed by detaching it from the first earth retaining member 31 and the first pile 61. This completes the construction method for the first support structure 60.

[0079] The construction method described above makes it easier to ensure a work space such as an installation space for the first body 81 within the first excavation area 11, thereby improving workability in the first excavation area 11 or in the vicinity thereof.

[0080] (Support structure construction method - Second support structure construction method) Next, the construction method of the second support structure 70 will be described. Fig. 9 is a diagram showing the pile and reinforcement body installation process of the construction method of the second support structure 70, and is a diagram showing the area corresponding to Fig. 3. Fig. 10 is a diagram showing the first root cutting process of the construction method of the second support structure 70, and is a diagram showing the area corresponding to Fig. 3. Fig. 11 is a diagram showing the second root cutting process of the construction method of the second support structure 70, and is a diagram showing the area corresponding to Fig. 3. Fig. 12 is a diagram showing the beam material installation process of the construction method of the second support structure 70, and is a diagram showing the area corresponding to Fig. 3. Fig. 13 is a diagram showing the third root cutting process of the construction method of the second support structure 70, and is a diagram showing the area corresponding to Fig. 3.

[0081] The construction method for the second support structure 70 includes a pile and reinforcing body installation process, a first root cutting process, a second root cutting process, a beam installation process, a third root cutting process, and a body installation and removal process, similar to the construction method for the second support structure 70. Note that the construction method for the second support structure 70 will be described on the assumption that the second earth retaining member 32 has already been buried in the second excavation area 21.

[0082] (Support structure construction method - Second support structure construction method - Pile and reinforcement body installation process) First, the pile and reinforcement body installation step will be described. The pile and reinforcement body installation step is a step of installing the second pile body 71 and the second reinforcement bodies 73a and 73b.

[0083] Specifically, using a known ground improvement body forming device, second reinforcement bodies 73a, 73b are formed in the second excavation region 21 at a predetermined distance from the second retaining member 32. More specifically, the mixing unit of the ground improvement body forming device is inserted into the ground, and the mixing head of the mixing unit is used to excavate the ground up to the top of the fourth silt layer 20f on the second construction side while discharging the ground improvement material. The excavated soil and the ground improvement material are then mixed. Next, as shown in FIG. 9 , before the ground improvement material hardens, a crane or other device is used to insert the second pile body 71 into the excavated hole, thereby burying the second pile body 71. More specifically, the position or inclination of the second pile body 71 is adjusted using an adjustable platform or other device, and the adjusted position or inclination of the second pile body 71 is maintained until the ground improvement material hardens.

[0084] (Support structure construction method - Second support structure construction method - First root cutting process) Next, the first root cutting step will be described. The first root cutting step is a step of cutting the ground to ensure an installation space for the second beam 72 after the pile and reinforcing body installation step.

[0085] Specifically, as shown in Figure 10, the above-mentioned excavation equipment, etc. is used to excavate the ground in the first surface layer 20a on the second construction side of the second excavation area 21, in the range from the second retaining wall member 32 to the boundary between the first excavation area 11 and the second excavation area 21, thereby performing root cutting.

[0086] (Support structure construction method - Second support structure construction method - Second root cutting process) Next, the second root cutting step will be described. The second root cutting step is a step of cutting the ground to further secure installation space for the second beam material 72 after the first root cutting step.

[0087] Specifically, as shown in Figure 11, the above-mentioned excavation equipment or the like is used to excavate the ground around the second pile body 71 in the second construction side first ground surface layer 20a and the second construction side second ground surface layer 20b of the second excavation area 21, thereby cutting the roots.

[0088] (Support structure construction method - Second support structure construction method - Beam installation process) Next, the beam installation step will be described. The beam installation step is a step of installing second beams 72 after the second root cutting step.

[0089] Specifically, as shown in Figure 12, the second retaining member 32 is placed between the second pile body 71 and the second retaining member 32, and is installed by connecting it to the second retaining member 32 and the second pile body 71 using fixing devices or welding, etc., and more specifically, it is installed so that the above-mentioned specified amount of axial force acts on the second beam member 72.

[0090] (Support structure construction method - Second support structure construction method - Third root cutting process) Next, the third root cutting step will be described. The third root cutting step is a step of cutting the ground after the beam installation step to ensure installation space for the second skeleton 82, which will be described later.

[0091] Specifically, as shown in Figure 13, the above-mentioned excavation equipment, etc. is used to excavate the ground in the second construction side second surface layer 20b and the second construction side first silt layer 20c in the second excavation area 21 from the second retaining wall member 32 to the second pile body 71, thereby performing root cutting (however, with regard to the ground in the second construction side first silt layer 20c, only the area near the second retaining wall member 32 is excavated).

[0092] (Support structure construction method - Second support structure construction method - Body installation and removal process) Next, the skeleton installation and removal process will be described. The skeleton installation and removal process is a process of installing the second skeleton 82 and removing the second beam material 72 after the third root cutting process.

[0093] Specifically, as shown in Figure 3, a second structure 82 (for example, flooring, pillars, etc.) is installed in the portion of the second excavation area 21 that has been cut in the third cutting step. Thereafter, when the second earth retaining members 32 are supported by the installed second structure 82, etc., the second beams 72 are removed by detaching them from the second earth retaining members 32 and the second piles 71. This completes the construction method for the second support structure 70.

[0094] The construction method described above makes it easier to ensure a work space such as an installation space for the second body 82 within the second excavation area 21, thereby improving workability in the second excavation area 21 or its vicinity.

[0095] (Effects of the embodiment) As described above, according to the embodiment, the pile body is driven inside the excavation area relative to the earth retaining member 30, and a beam member connecting the earth retaining member 30 and the pile body is provided. Therefore, the length of the beam member can be shortened compared to the conventional technique (technology in which a beam is provided between the first steel sheet pile and the second steel sheet pile). This makes it easier to secure work space within the excavation area (e.g., space for the traffic flow of transport vehicles, space for the construction of a platform or a preceding structure, etc.), thereby improving workability in or near the excavation area. Furthermore, the material cost of the beam member can be reduced, thereby reducing the installation cost of the support structure 50. Furthermore, excessive expansion and contraction of the beam member due to temperature (thermal) stress can be avoided, enabling stable support of the earth retaining member 30. From the above, the installability of the support structure 50 can be improved.

[0096] In addition, since the pile body is further provided with a reinforcing body buried around the pile body for reinforcing the pile body, the pile body can be firmly supported and the earth retaining member 30 can be easily supported stably.

[0097] Furthermore, since the reinforcement body includes a foot-solidifying body formed with a foot-solidifying liquid or a ground improvement body formed with a ground improvement material, the reinforcement body can be constructed with either a foot-solidifying body or a ground improvement body depending on the ground conditions, thereby improving the workability of the reinforcement body. For example, when the reinforcement body is to be formed in a relatively hard stratum, constructing the reinforcement body with a foot-solidifying body makes it relatively easy to form the reinforcement body. Also, when the reinforcement body is to be formed in a relatively soft stratum, constructing the reinforcement body with a ground improvement body makes it relatively easy to form the reinforcement body.

[0098] Furthermore, the beam is tilted so that the end of the beam on the pile body side is positioned lower than the end of the beam on the retaining member 30 side. This prevents unfavorable forces from acting on the retaining member 30 (such as forces that cause the retaining member 30 to float upward) compared to when the beam is positioned horizontally, making it easier to stably support the retaining member 30.

[0099] [III] Modifications to the embodiment Although the embodiments of the present invention have been described above, the specific configurations and means of the present invention can be modified and improved as desired within the scope of the technical ideas of the inventions set forth in the claims. Such modifications will be described below.

[0100] (About the problem to be solved and the effects of the invention) First, the problems that the invention aims to solve and the effects of the invention are not limited to those described above, and the present invention may solve problems that are not described above or achieve effects that are not described above, or may solve only some of the problems that are described or achieve only some of the effects that are described.

[0101] (shape, numbers, structure, time series) The components illustrated in the embodiments and drawings may be modified and improved as desired within the scope of the technical concept of the present invention in terms of shape, numerical value, or the structure or chronological relationship of multiple components.

[0102] (Regarding the first and second construction areas) In the above embodiment, it has been explained that the first construction area 10 is composed of a first construction side ground surface layer 10a, a first construction side first silt layer 10b, a first construction side second silt layer 10c, a first construction side first clay layer 10d, and a first construction side second clay layer 10e, but this is not limited to this and the area may be composed of, for example, a first construction side ground surface layer 10a, a first construction side first silt layer 10b, and a first construction side second clay layer 10e.

[0103] Furthermore, in the above embodiment, the second construction area 20 is described as being composed of the second construction side first ground surface layer 20a, the second construction side second ground surface layer 20b, the second construction side first silt layer 20c, the second construction side second silt layer 20d, the second construction side third silt layer 20e, the second construction side fourth silt layer 20f, and the second construction side clay layer 20g, but is not limited to this and may be composed of, for example, the second construction side first ground surface layer 20a, the second construction side first silt layer 20c, the second construction side second silt layer 20d, the second construction side fourth silt layer 20f, and the second construction side clay layer 20g.

[0104] (About the support structure) In the above embodiment, the support structure 50 has been described as including the first support structure 60 and the second support structure 70, but this is not limited to this. For example, if the first retaining member 31 is supported by a support material other than the first support structure 60, the first support structure 60 may be omitted. Also, if the second retaining member 32 is supported by a support material other than the second support structure 70, the second support structure 70 may be omitted.

[0105] Furthermore, in the above embodiment, it has been described that one first beam 62 is connected to the first pile body 61 of the first support structure 60, but this is not limited to this, and for example, multiple first beams 62 may be connected (the same applies to the second beam 72 of the second support structure 70).

[0106] Furthermore, in the above embodiment, it has been described that the first beams 62 of the first support structure 60 are provided at an incline so that the ends of the first beams of the first support structure 60 that face the first pile 61 are positioned lower than the ends of the first beams 62 that face the first earth retaining member 31, but this is not limiting. For example, as long as no unfavorable force acts on the first earth retaining member 31, the first beams 62 may be provided at an incline so that the ends of the first beams of the first support structure 60 that face the first pile 61 are positioned higher than the ends of the first beams 62 that face the first earth retaining member 31, or the first beams 62 may be provided horizontally (the same applies to the second beams 72 of the second support structure 70).

[0107] Furthermore, in the above embodiment, the first support structure 60 is described as having a first reinforcing body 63, but this is not limited to this, and for example, the first reinforcing body 63 may be omitted (the same applies to the second reinforcing body of the second support structure 70).

[0108] Furthermore, in the above embodiment, the second support structure 70 is described as including the second reinforcing body 73a, but this is not limiting, and for example, the second reinforcing body 73a may be omitted.

[0109] (Concerning the construction method of the support structure) In the above embodiment, the first beam 62 is removed in the body installation and removal steps of the construction method for the first support structure 60, but this is not limited to this. For example, if the first beam 62 is used as a component of the first body 81, the first beam 62 does not need to be removed (the same applies to the body installation and removal steps of the construction method for the second support structure 70).

[0110] (Addendum) The support structure of Appendix 1 is a support structure for supporting a retaining wall member constructed in an excavation area, and comprises a pile body driven inside the excavation area relative to the retaining wall member, and a beam member connecting the retaining wall member and the pile body.

[0111] The support structure of Appendix 2 is the support structure of Appendix 1, further comprising a reinforcing body buried around the pile body, the reinforcing body being for reinforcing the pile body.

[0112] The support structure of Appendix 3 is the support structure described in Appendix 2, wherein the reinforcing body includes a foot fixing body formed with a foot fixing liquid or a ground improvement body formed with a ground improvement material.

[0113] The support structure of Appendix 4 is a support structure described in any one of Appendixes 1 to 3, in which the beams are inclined so that the ends of the beams facing the pile body are positioned lower than the ends of the beams facing the retaining member.

[0114] (Effect of supplementary notes) The support structure described in Appendix 1 includes piles driven into the excavation area further inward than the earth retaining members and beams connecting the earth retaining members and the piles. This allows for shorter beam lengths compared to the prior art (techniques in which beams are installed between the first steel sheet pile and the second steel sheet pile). This makes it easier to secure work space within the excavation area (e.g., space for the traffic flow of transport vehicles, space for the construction of gantry or preceding structures, etc.), thereby improving workability in or near the excavation area. It also reduces the material costs of the beams and the installation costs of the support structure. Furthermore, it is possible to prevent excessive expansion and contraction of the beams due to temperature (thermal) stress, ensuring stable support for the earth retaining members. These factors contribute to improving the installability of the support structure.

[0115] According to the support structure described in Appendix 2, a reinforcing body is buried around the pile body, and further includes a reinforcing body for reinforcing the pile body, so that the pile body can be firmly supported and it becomes easier to stably support the retaining member.

[0116] According to the support structure described in Appendix 3, the reinforcement body includes a foot-fixing body formed with a foot-fixing liquid or a ground improvement body formed with a ground improvement material, so the reinforcement body can be constructed with a foot-fixing body or a ground improvement body depending on the ground conditions, improving the workability of the reinforcement body. For example, when the reinforcement body is to be formed in a relatively hard stratum, constructing the reinforcement body with a foot-fixing body makes it relatively easy to form the reinforcement body. Also, when the reinforcement body is to be formed in a relatively soft stratum, constructing the reinforcement body with a ground improvement body makes it relatively easy to form the reinforcement body.

[0117] According to the support structure described in Appendix 4, the beams are tilted so that the ends of the beams on the pile body side are positioned lower than the ends of the beams on the retaining member side.This makes it possible to prevent unfavorable forces from acting on the retaining member (for example, forces that cause the retaining member to float upward) compared to when the beams are positioned horizontally, making it easier to stably support the retaining member. [Explanation of symbols]

[0118] 1 Construction area 10 1st construction area 10a 1st construction side ground layer 10b First construction side first silt layer 10c 2nd silt layer on the 1st construction side 10d 1st construction side 1st Dotan layer 10e 1st construction side 2nd Dotan layer 11 First drilling zone 12 First Unexcavated Area 20 Second construction area 20a 2nd construction side 1st surface layer 20b 2nd construction side 2nd ground layer 20c 2nd construction side 1st silt layer 20d Second construction side second silt layer 20e 2nd construction side 3rd silt layer 20f 2nd construction side 4th silt layer 20g 2nd construction side Dotan layer 21 Second Drilling Zone 22 Second Unexcavated Area 30 Earth retaining members 31 First earth retaining member 32 Second retaining member 50 Support structure 60 First support structure 61 1st pile body 62 First beam 63 First Reinforcement 70 Second support structure 71 Second pile body 72 Second beam 73a Second reinforcement body 73b Second Reinforcement 81 1st body 82 Second body

Claims

1. A support structure comprising a retaining member constructed in an excavation area and a support structure for supporting the retaining member, The support structure includes: A pile body driven into the excavation area more inward than the retaining member; A beam material connecting the earth retaining member and the pile body, The pile body is configured such that, when the pile body is driven into the excavation area in a state in which the upper end of the retaining member is constructed in the excavation area so that the upper end of the retaining member is approximately flush with the surface of the excavation area, and the lower end of the pile body is positioned in a stratum that can stably support the pile body. Support structure.

2. The support structure further comprises a reinforcing body buried around the pile body, the reinforcing body being used to reinforce the pile body; The reinforcement body includes a foot protection body formed with a foot protection liquid, The vertical length of the pile body is made longer than the vertical length of the retaining member, The vertical length of the foot protection body is shorter than the vertical length of the pile body, The foot protection body was buried so that the lower end of the foot protection body was located lower than the lower end of the pile body. The support structure of claim 1 .

3. The beam material is inclined so that the end of the beam material on the pile body side is located lower than the end of the beam material on the retaining member side. A support structure according to claim 1 or 2.

Images