JP2011038287A - Earth retaining wall structure and method for constructing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earth retaining wall structure which enables excavation to be performed by a shield machine, and which can increase strength. <P>SOLUTION: In this earth retaining wall structure, an end of an H-shaped steel material 2 and an end of a composite body 10, which is constituted by superposing a plurality of plate-like members 3-6 made by mixing inorganic fibers into a plastic foam, are joined together. A pair of flanges 12 at the end of the H-shaped steel material 2 joined to the composite body 10 is notched except a web 11; ends of the pair of composite bodies 10 are provided across the web 11 of the H-shaped steel material 2 in such a manner as to lead to notched portions of the flanges 12; and a side surface of the composite body 10 is almost flush with an outer surface of the remaining flange portion of the H-shaped steel material 2. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a retaining wall structure installed at a start portion and a reaching portion of a shield excavator and a method for constructing the retaining wall structure.

  The conventional retaining wall structure is made of reinforced concrete, but the reinforced concrete retaining wall structure is difficult to excavate with a shield excavator. Therefore, when the shield excavator starts or arrives, it is necessary to break down the retaining wall structure member manually, which is troublesome. Therefore, a retaining wall structure that does not require such labor is conceived, and a retaining wall structure that can be excavated by a shield excavator is disclosed in, for example, Patent Document 1 and Patent Document 2.

JP 2000-27590 A JP 2002-38870 A

  The retaining wall structure and shield tunneling shaft wall disclosed in Patent Literature 1 and Patent Literature 2 are a plurality of plates in which opposite ends of spaced H-shaped steel materials are mixed with plastic foam and inorganic fibers. It is configured to be connected by a composite body in which shaped members are stacked. That is, this composite part can be easily broken by a shield excavator and does not need to be broken by human power, thus solving the original problem.

  By the way, the retaining wall structure needs to have a considerable strength, as can be seen from the fact that the conventional retaining wall structure member is made of reinforced concrete. However, the configurations disclosed in Patent Document 1 and Patent Document 2 are such that the middle part of the H-shaped steel material is cut, so that it is disadvantageous in strength compared to the conventional retaining wall structure member. It is.

  Accordingly, an object of the present invention is to provide a retaining wall structure that can be excavated by a shield excavator and can further improve the strength, and a method for constructing the retaining wall structure.

  The invention of claim 1 for solving the above-mentioned problem is to join an end of an H-shaped steel material and an end of an excavable member configured by mixing inorganic fibers in a plastic foam, and the excavable member is In a retaining wall structure excavated by an excavator, a pair of flanges of the H-shaped steel material are cut out by a predetermined length from an end portion, leaving a web, and ends of the pair of excavable members are formed by the H-shaped steel material. The side surface of the excavable member is configured to be substantially flush with the outer surface of the remaining flange portion of the H-shaped steel material. It is a retaining wall structure characterized by.

In the earth retaining wall structure of the invention of claim 1, the pair of flanges at the end of the H-shaped steel material joined to the excavable member is cut away leaving the web, and the ends of the pair of excavable members are Since the H-shaped steel web is sandwiched and reaches the notched portion of the flange, the cross-sectional area of the joint portion of the excavable member is larger than when the flange portion of the end portion is not notched. Become. Here, “to reach the notched portion of the flange” means that the end portions of the pair of excavable members are provided so as to approach or abut on the notched portion (contact portion) of the flange.
That is, the cross-sectional area of the end portion of the excavable member can be expanded without being interfered by the flange at the end portion of the H-shaped steel material. As a result, the section modulus increases and the strength of the composite increases. That is, the section modulus on the side of the excavable member, which is weaker than the H-type steel material, is improved, and the strength of the earth retaining wall structure member at the joint portion can be increased.
Therefore, the joint portion between the H-shaped steel material and the excavable member of the retaining wall structure member can ensure the strength and function well as the retaining wall, and the excavable member can be excavated by the shield excavator. it can.

  The invention according to claim 2 is the earth retaining material according to claim 1, wherein the excavable member is a composite body formed by stacking a plurality of plate-like members in which inorganic fibers are mixed in a plastic foam. It is a wall structure.

  In the earth retaining wall structure of the invention of claim 2, since the excavable member is a composite formed by stacking a plurality of plate-like members mixed with inorganic fibers in a plastic foam, the earth retaining wall structure in the joint portion The strength of the member is improved.

  According to a third aspect of the present invention, an adhesive plate is provided between an end portion of the plate-shaped member and an end portion of the H-shaped steel material, and the adhesive plate is sandwiched between the plate-shaped members. 3. The earth retaining wall structure according to claim 2, wherein the plate is welded and attached to the inner surface of the H-shaped steel material left without being cut out.

  In the earth retaining wall structure of the invention of claim 3, an adhesive plate is provided between the end of the plate-like member and the end of the H-type steel material, and the adhesive plate is welded and attached to the inner surface of the H-type steel material. Therefore, the strength of the connecting portion between the excavable member and the H-shaped steel material is improved.

  The invention of claim 4 is characterized in that the end portion of the excavable member is in contact with the end portion of the flange of the H-shaped steel material left without being cut out. The retaining wall structure according to any one of the above.

  In the retaining wall structure of the invention of claim 4, since the excavable member is in contact with the end portion of the flange of the H-shaped steel material formed by being removed, when the retaining wall structure member is driven into the ground The strength of the retaining wall structural member is improved.

  The invention according to claim 5 is the earth retaining wall structure according to any one of claims 1 to 4, wherein the web and the excavable member are bonded.

  In the earth retaining wall structure of the invention of claim 5, since the web at the end of the H-shaped steel material is inserted into the excavable member and the web and the excavable member are bonded, the connection between the H-shaped steel material and the excavable member is achieved. The strength of the part is improved.

  The invention of claim 6 is covered with one connecting plate from the outer surface of each flange of the H-shaped steel material left uncut to the side surface of the excavable member, and from the edge of both flanges to the excavable member. The earth retaining member according to any one of claims 1 to 5, wherein the earth retaining plate is covered with another connection plate, and edges of the one connection plate and the other connection plate are welded to each other. It is a wall structure.

  In the retaining wall structure according to the sixth aspect of the invention, the outer surface of each remaining flange of the H-shaped steel material and the side surface of the excavable member are covered with one connecting plate, and the edge of both flanges can be excavated. Since the member is covered with another connection plate, the excavable member at the joint portion is protected by the connection plate, and the strength of the joint portion is increased. In addition, since the edges of the one connection plate and the other connection plate are welded to each other, the strength of the joint portion is improved as compared with the case of fixing with bolts and nuts. More preferably, the connecting plate and the H-shaped steel material are fixed by welding.

  In the invention of claim 7, the excavable member is interposed between one H-shaped steel material and another H-shaped steel material, and both end portions of the excavable member are joined to the end portions of both H-shaped steel materials. The earth retaining wall structure according to any one of claims 1 to 6, wherein:

  In the retaining wall structure according to the seventh aspect of the present invention, since both ends of the excavable member are connected to the end portions of different H-shaped steel materials, the excavable member is disposed at a position in the middle of the retaining wall structure member. Is done. As a result, the earth retaining wall structural member can be buried in the ground from the one H-type steel material side having high strength. That is, when placing the earth retaining wall structure member in the ground, the excavable member does not have to be worn or destroyed.

The invention of claim 8 is a method for constructing a retaining wall structure in which an end portion of an H-shaped steel material and an end portion of an excavable member that is configured to be easily excavated by an excavator by mixing inorganic fibers in a plastic foam. The end portions of the pair of flanges of the H-shaped steel material are notched for a predetermined length leaving the web, and the end portions of the pair of excavable members are notched of the flanges so as to sandwich the web of the H-shaped steel material. The construction method of the retaining wall structure is characterized in that it is provided so as to reach a part, and the side surface of the excavable member is configured to be substantially flush with the outer surface of the remaining flange portion of the H-shaped steel material. .

  If the construction method of the earth retaining wall structure of invention of Claim 8 is implemented, the earth retaining wall structure member which improved the intensity | strength of the connection part of H-shaped steel materials and an excavable member can be constructed.

  The earth retaining wall structure member configured by implementing the present invention can ensure a large section modulus of the excavable member, improve the strength of the connecting portion of the H-shaped steel material and the excavable member, and provide an excellent earth retaining Function can be demonstrated. In addition, when the present invention is carried out, the excavable member of the retaining wall structure member can be excavated with the shield excavator, so that the work efficiency is good.

It is a perspective view of the earth retaining wall structure member comprised by implementing this invention, (a) shows the state which decomposed | disassembled each member, (b) shows the state which assembled the composite, (c) is The state which enclosed the junction part with the connection board is shown. (A) is the decomposition | disassembly partial top view of the retaining wall structure member comprised by implementing this invention, (b) is the fragmentary top view of the assembled state of the retaining wall structure member of this invention, ( c) is a partial side view of the retaining wall structure member of the present invention. (A) is a partial top view of the earth retaining wall structure member by which the junction part was fixed with the connection board, (b) is an AA cross-sectional arrow view of (a), (c) is (b). It is an AA cross-sectional arrow view of the state before a junction part is fixed in a connection board. (A) is a partial top view of the earth retaining wall structure member different from FIG. 1 which implemented this invention, (b) is an exploded plan view of (a). (A) is a fragmentary perspective view of the earth retaining wall structure member of FIG. 4, (b) is an exploded perspective view of (a). (A) is a side view of the state where the earth retaining wall structure member is disposed in the ground, and (b) is a front view of the earth retaining wall structure member disposed in the ground. (A) is a perspective view which shows the state which weld-fixed the adhesive board to the H-type steel material, (b) is a front view of the adhesive board of (a), (c) is B of (a). It is -B sectional drawing.

Hereinafter, the structure of the retaining wall structure member which implemented the retaining wall structure of this invention is demonstrated, referring drawings.
As shown in FIGS. 1A to 1C, the earth retaining wall structural member 1 is configured by joining an H-shaped steel material 2 and a composite 10 (excavable member). In the H-type steel material 2, a part of the upper and lower flanges 12 is notched to form a remaining portion 12 a and a contact portion 12 b. The composite 10 is configured by combining a plurality of plate-like members. Hereinafter, the H-shaped steel material 2, the composite 10 and their assembled structures will be described in order.

First, the H-shaped steel material 2 will be described.
The H-type steel material 2 has a part of the end portion of the flange 12 cut away, and a residual portion 12a and a contact portion 12b are formed at the end portion. As shown in FIG. 2A, the remaining portion 12 a is slightly wider than the web 11, and is originally a part of the flange 12. That is, the remaining portions 12a are continuous at both ends of the web 11 (up and down as viewed in FIG. 2A).

  Therefore, although a part of the flange 12 is cut out, it extends from the outside of the one remaining portion 12a (the side opposite to the web 11) to the outside of the other remaining portion 12a (the side opposite to the web 11). The distance is the same as the height of the H-shaped steel material 2 indicated by the height H1 in FIGS. 3 (b) and 3 (c). Moreover, although the notch length L of the residual part 12a shown to Fig.2 (a) can be about 0.9-2.5 times the height H1, More preferably, it is 1.0-2.0. Is double.

In the commercially available H-shaped steel, R is formed at the connecting portion between the web and the flange. Therefore, it is preferable to remove this R by a grinder process or the like before joining the composite 10 described later. In addition, when there is no commercially available H-shaped steel having a suitable size, a steel plate may be formed into an H shape by built-up and used instead of the H-shaped steel.
The “outer surface” of the H-shaped steel material refers to a surface opposite to the surfaces (inner surfaces) facing each other of a pair of flanges of one H-shaped steel material. The “width” refers to the length in the direction perpendicular to the web.

Next, the composite 10 will be described.
As shown in FIG. 1 (a), FIG. 2 (a), and the like, the composite 10 is composed of plate-like members 3 to 6, connection plates 7 and 8, and the like. Among them, the plate-like member 4 has the same width as the width of the web 11. Plate members 3 a, 5 a, 6 a to 6 c are arranged on one side of the plate member 4, and 3 b, 5 b, 6 d to 6 f are arranged on the opposite side of the plate member 4. Each plate-like member is configured by mixing inorganic fibers in a plastic foam.
The plate-like member is preferably a foamed urethane resin mixed with inorganic fibers, and examples thereof include “Eslon Neo Lumber FFU” manufactured by Sekisui Chemical Co., Ltd. Or you may comprise from the unsaturated polyester resin reinforced with the fiber.

  The plate-like members 3 a and 3 b have a width that is just accommodated in the remaining portion 12 a of the flange 12. That is, as shown in FIG. 2B, the width when the plate-like members 3a and 3b and the plate-like member 4 are overlapped is the same as the width of the remaining portion 12a. The height of the plate-like members 3a and 3b is the same as the height of the web 11 that can be inserted between the flanges 12 with almost no gap. Here, the “height” is the length of the plate-like members 3 a and 3 b and the web 11 in the direction orthogonal to the flange 12.

  Here, when the width of the remaining portion 12a is ensured by the width (thickness) of the plate-like members 3a and 3b, the retaining wall structure member 1 is joined by a steel material (H-shaped steel material) that is stronger than the composite 10. The strength of the portion 13 can be improved.

The plate-like members 5a and 5b have the same width as the plate-like members 3a and 3b, respectively, but the height is the height H1 of the H-shaped steel material 2. Furthermore, the cross-sectional dimensions of the plate-like members 6a to 6f are the same. The height of the plate-like members 6a to 6f is the same as the height dimension H1 of the H-shaped steel material 2. In other words, the plate-like members 6 a to 6 f reach the position where the portion that has been cut out and removed exists in the end portion of the flange 12 of the H-shaped steel material 2. The width when these plate-like members 3a (5a), 3b (or 5b), 4, 6a to 6f are overlapped is an H-shaped steel material 2 indicated by a dimension W1 in FIGS. 3 (b) and 3 (c). Is the same as the width of
“It has reached the position where the part that has been cut out and removed exists” means that the plate-like members 6a to 6c and the plate-like members 6d to 6f shown in FIG. Although they are a part of the body 10, they are sandwiched between the webs 11 of the H-shaped steel 2 as a pair of composites (a pair of excavable members). It means to be provided so as to abut.

Next, the assembly structure of the composite 10 and the retaining wall structure member 1 will be described.
FIG. 1A shows a state in which the earth retaining wall structure member 1 in a completed state shown in FIG. 1C is disassembled, and a plate-like member 3a is provided on the side wall of the web 11 of the H-shaped steel material 2. FIG. And 3b are bonded and fixed so as to protrude from the remaining portion 12a. A plate-like member 4 is disposed between the plate-like members 3a and 3b protruding from the remaining portion 12a, and the plate-like member 4 is bonded and fixed to the plate-like members 3a and 3b. The plate-like member 4 is in contact with the remaining portion 12 a and the tip of the web 11.

  Then, the ends of the plate-like members 5a and 5b are brought into contact with the tips of the plate-like members 3a and 3b, respectively, the plate-like member 5a is bonded and fixed to the plate-like members 3a and 4, and the plate-like member 5b is plate-like. The members 3b and 4 are bonded and fixed.

  Further, the plate-like members 6a to 6c are bonded and fixed to each other, and the tip is brought into contact with the contact portion 12b of the flange 12 to be bonded and fixed. Further, the plate-like member 6a is bonded and fixed to the plate-like members 3a and 5a and the remaining portion 12a. Similarly, the plate-like members 6d to 6f are also fixed to the opposite side of the plate-like members 6a to 6c as shown in FIG.

  Finally, connection plates 7a and 7b and 8a and 8b are used as necessary. That is, the connection plates 7 a and 7 b are arranged in parallel above and below the joint portion 13, and the connection plates 8 a and 8 b are arranged in parallel from both sides and are bonded and fixed to the joint portion 13 of the composite 10.

  Then, as shown in FIG. 3 (b), both sides of the connection plates 7a and 7b are welded and fixed to the connection plates 8a and 8b, respectively, so that welded portions 9a to 9d are formed. Moreover, the site | part which each connection plate and the H-shaped steel material 2 contact is also welded, and the welding part 14 is formed. Thereby, each connection plate and the H-shaped steel material 2 are firmly fixed. When the connection plates 7a and 7b and 8a and 8b are used, the maximum dimensions at the joint 13 are the height H2 and the width W2.

  The width dimension of each plate-shaped member described above is not limited to that described above, and can be arbitrarily selected as appropriate. For example, the number of the three plate-like members 6a to 6c can be four or two. Further, the remaining portion 12a may leave only the width of the web 11, and the height dimension may be the height H1 of the H-shaped steel material 2. As a result, the range of selection of the number and thickness of each plate-like member is expanded.

  Thus, the assembly of the retaining wall structure member 1 is completed, and the state shown in FIG. Each figure shows a state in which the H-shaped steel material 2 is arranged and connected only at one end of the composite 10, but in actuality, H is formed on both sides (both ends) of the composite 10 with the same configuration. The shape steel material 2 is connected, and the two H-shaped steel materials 2 are connected by the composite 10. Of course, the earth retaining wall structural member can also be configured by connecting an H-shaped steel material to only one of the composites 10, as shown in FIG.

  FIG. 6 shows a state in which the earth retaining wall structure member 1 configured as described above is arranged in the ground. As shown in FIG. 6 (a), the retaining wall structure member 1 is arranged on the start side and the arrival side of the shield excavator 15 as in the conventional case. Further, as shown in FIG. 6B, a plurality of retaining wall structural members 1 are arranged on the start side and the arrival side, and the composite 10 is arranged so that an excavation circle 16 indicated by a broken line can be formed. As a result, a plurality of composite 10 parts can be excavated by the shield excavator 15.

  By the way, the joining part 13 of the earth retaining wall structure member 1 of the present invention has a cross-sectional shape shown in FIG. 3 (b) or FIG. 3 (c). That is, each plate-like member whose strength is weaker than that of the H-shaped steel material 2 is configured by mixing inorganic fibers in a plastic foam. The height dimension H1 of the plate-like members other than the plate-like members 3a and 3b is the same as the height of the H-shaped steel material 2. That is, the height dimension of the flange 12 of the H-shaped steel material 2 is larger than that of the conventional composite by the thicknesses H3 and H4. As a result, the section modulus Z of the composite 10 (joint portion 13) of the earth retaining wall structure member 1 of the present invention is improved as compared with the conventional one.

Here, the section modulus will be compared using a commercially available H-shaped steel 700 * 300 * 13 * 24 (* is multiplication) as an example. As shown in FIG. 3 (b) and (c), the cross-sectional shape is rectangular, section modulus Z of the rectangle is generally (section width) * (sectional height) is calculated by ^2/6.
Assuming that the cross-sectional width W1 is the same as the conventional one,
700 ² / (700−24 * 2) ² = 1.153
Thus, the strength is improved by about 15%. That is, when the present invention is carried out using commercially available H-shaped steel 700 * 300 * 13 * 24, the strength of the retaining wall structure member is improved by 15% or more than that of the conventional method.

Here, in the actual conventional product, the H-shaped steel flange is not cut out, and the plate-like member is accommodated between both flanges, so the size of the plate-like member (composite) is about 5 mm from the gap height between both flanges. It is often set to a small degree. Therefore, the calculation by the above formula is
700 ² / {700− (24 + 5) * 2} ² = 1.189
Thus, the strength of the retaining wall structure member constructed by implementing the present invention can be expected to be improved by 20% or more than the conventional product.

Next, another embodiment of the present invention will be described with reference to FIGS.
The basic structure of the retaining wall structure member 20 shown in FIGS. 4 and 5 is basically the same as that of the retaining wall structure member 1 shown in FIG. 1 and the like, but is greatly different in that an adhesive plate 21 is used. is doing. Therefore, below, the overlapping description is abbreviate | omitted and only a different structure is demonstrated.

  The composite 30 constituting the earth retaining wall structure member 20 is composed of two sets of plate-like members 22 to 25. Each plate-like member is formed with step portions 22 a to 25 a that abut against the abutting portion 32 b of the flange 32 of the H-shaped steel material 31. Moreover, the edge part of the plate-shaped member 22 is notched and the notch part 22b with a narrow width | variety is formed. The plate-like member 25 is also formed with a notch 25 b similar to the plate-like member 22. Further, the plate-like members 23 and 24 arranged on the center side are formed with notches 23b and 23c and 24b and 24c on both sides.

  When the respective plate-like members 22 to 25 are overlapped, slits 26 to 28 (connection plate insertion portions) are formed by these notches. That is, the slit 26 is formed by the notches 22b and 23b, the slit 27 is formed by the notches 23c and 24b, and the slit 28 is formed by the notches 24c and 25b. The slits 26 to 28 are formed from the inner surface of one flange 32 to the inner surface of the other flange 32.

  The adhesive plate 21 is inserted and fixed to the slits 26 to 28. The adhesive plate 21 has a width and height that can be inserted into the slits 26 to 28. As shown in FIG. 5B, the adhesive plate 21 is provided with a hole 21a. When the adhesive plate 21 is inserted into each of the slits 26 to 28, the holes 21a provided in the respective adhesive plates 21 are arranged concentrically so that the fastening bolts 33 can be inserted.

  The web 36 is provided with a hole 36a. The holes 36 a are arranged concentrically with the holes 21 a of the adhesive plate 21 when the adhesive plates 21 are bonded and fixed to the composite 30 and the composite 30 is mounted on the H-type steel material 31. Therefore, each hole 21 a and the hole 36 a arranged concentrically can be penetrated by the same fastening bolt 33.

  Further, a cotter 35 is disposed between the adhesive plates 21 or between the adhesive plate 21 and the web 36, and the nuts 34 are screwed together through the adhesive plate 21 and the web 36 with fastening bolts 33. Thereby, each adhesive plate 21 is firmly fixed to the H-shaped steel material 31. Moreover, since each adhesive plate 21 is inserted and bonded into the slits 26 to 28, the bonding strength between the H-shaped steel material 31 and the composite 30 is improved.

  Although not depicted in FIGS. 4 and 5, in this embodiment, the connection plates 7 a, 7 b, 8 a, and 8 b shown in FIG. 1 are further surrounded and bonded to the connection portions to connect the connection plates together. It may be fixed by welding.

  Further, as shown in FIG. 7A, the adhesive plate may be fixed to the H-shaped steel material by welding. The adhesive plate 29 shown in FIGS. 7A to 7C has step portions 29a and 29b similar to the step portion 25a of the plate-like member 25 shown in FIG. Each of these step portions 29 a and 29 b is formed so as to just contact the contact portion 32 b of the flange portion 32 of the H-shaped steel material 31. Then, as shown in FIG. 7B, for example, 45 ° grooves 41 to 45 are formed in the step portions 29 a and 29 b of the adhesive plate 29 and portions along the flange surface. Welding is performed along the grooves 41 to 45, and welding beads 37 and 38 are inserted into the grooves 41 to 45, and the H-shaped steel material 31 and the adhesive plate 29 are integrally fixed.

  The beads 37 and 38 are grinder finished so that the plate-like member can be arranged along the adhesive plate 29. However, when the space required for welding cannot be secured on the web 36 side of the adhesive plate 29, only the side (outside) that is easy to weld is subjected to groove processing and welded. In FIG. 7A, one adhesive plate 29 is arranged on each side of the web 36, but the number of the adhesive plates 29 can be appropriately selected.

  When the H-type steel material 31 and the adhesive plate 29 are fixed by welding, as shown in FIG. 4A, the bolt 33, the bolt 33, and the adhesive plate 21 are fixed with bolts 33 and nuts 34, as shown in FIG. The nut 34 does not loosen. In addition, the strength of the joining portion between the H-shaped steel 31 and the composite body (joining plate) is improved by fixing by welding rather than fixing by the bolt 33 and the nut 34.

  In the earth retaining wall structure of the present invention described above, the section modulus on the composite side can be increased and the strength can be increased by notching the flange of the H-shaped steel material and increasing the height of the composite. it can. In addition, each plate-like member and H-shaped steel material are joined together by surrounding the periphery with two sets of parallel connection plates from a mechanical joint using cotters and bolts and nuts, and welding the connection plates to each other. Strength can be improved.

  In addition, although the earth retaining wall structure member 1 shown in FIGS. 1-5 has arrange | positioned each plate-shaped member 3-6 which comprises the composite_body | complex 10 in parallel with the web 11 of the H-shaped steel material 2, it is H-shaped steel material. A plate-like member having the same width as that of the flange is arranged in parallel to the flange (in a direction orthogonal to the web), and the height of the plate-like member laminated along the web is made to coincide with the height of the H-shaped steel material. It can also be.

  Moreover, you may employ | adopt the excavable member which mixed the inorganic fiber in the plastic foam instead of the composite_body | complex 10 comprised with several plate-shaped members 3-6. The excavable member is an integrally molded product having the strength and shape of the composite 10 and can be easily excavated with an excavator. The end of this excavable member is molded in accordance with the shape of the end of the H-shaped steel 2 shown in FIG. 1 and connected to the end of the H-shaped steel 2 instead of the composite 10. If the adhesive plate 21 as shown in FIG. 4 is used, slits 26 to 28 are provided at the end of the excavable member, and the adhesive plate 21 is engaged with the slits 26 to 28.

DESCRIPTION OF SYMBOLS 1 Earth retaining wall structural member 2 H-type steel materials 3-6 Plate-shaped members 7a, 7b, 8a, 8b Connection plates 9, 14 Welded part 10 Composite 11 H-shaped steel material web 12 H-shaped steel material flange 12a Flange remaining part 12b Flange contact part 13 Joint part 26-28 of H-type steel and composite Slit (insertion part of connecting plate)

Claims (8)

In the retaining wall structure in which the end portion of the H-type steel material and the end portion of the excavable member configured by mixing inorganic fibers in the plastic foam are joined, and the excavable member is excavated by an excavator,
A pair of flanges of the H-shaped steel material are cut out by a predetermined length from the end portions leaving the web, and end portions of the pair of excavable members sandwich the webs of the H-shaped steel material and are portions where the flanges are notched. The earth retaining wall structure is configured so that a side surface of the excavable member is substantially flush with an outer surface of the remaining flange portion of the H-shaped steel material.   The earth retaining wall structure according to claim 1, wherein the excavable member is a composite formed by stacking a plurality of plate-like members in which inorganic fibers are mixed in a plastic foam.   An adhesive plate is provided between an end portion of the plate-like member and an end portion of the H-shaped steel material, the adhesive plate is sandwiched between the plate-like members, and the adhesive plate is not cut out. The retaining wall structure according to claim 2, wherein the retaining wall structure is welded and attached to the inner surface of the remaining H-shaped steel material.   The soil according to any one of claims 1 to 3, wherein an end portion of the excavable member is in contact with an end portion of the flange of the H-shaped steel material left without being cut out. Retaining wall structure.   The retaining wall structure according to any one of claims 1 to 4, wherein the web and the excavable member are bonded to each other.   Covered with one connecting plate from the outer surface of each flange of the H-shaped steel material left uncut to the side of the excavable member, and covered with the other connecting plate from the edge of both flanges to the excavable member The earth retaining wall structure according to any one of claims 1 to 5, wherein edges of the one connection plate and the other connection plate are welded to each other.   The excavable member is interposed between one H-shaped steel material and another H-shaped steel material, and both end portions of the excavable member are joined to end portions of both H-shaped steel materials. The earth retaining wall structure according to claim 6. In the construction method of the retaining wall structure that joins the end portion of the H-shaped steel material and the end portion of the excavable member configured to be easily excavated by an excavator by mixing inorganic fibers in the plastic foam,
The end portions of the pair of flanges of the H-shaped steel material are notched to a predetermined length leaving the web, and the end portions of the pair of excavable members are located to the notched portions of the flange so as to sandwich the web of the H-shaped steel material. The construction method of the retaining wall structure is characterized in that the side wall of the excavable member is configured to be substantially flush with the outer surface of the remaining flange portion of the H-shaped steel material.

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