JP7219529B2 - Combination structure of steel materials, shoring structure and construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a combined structure of steel materials that can be used as a material for temporary structures such as wales, girders, and girder supports. The present invention also relates to an earth retaining shoring structure using the structure and a construction method thereof.

An earth retaining shoring structure generally consists of multiple earth retaining walls erected to abut against the excavated surface of the ground, multiple wales spanning horizontally to support the earth retaining walls, and corners. It is configured including a flint beam temporarily installed between adjacent wale in the part. Conventionally, it has been demanded to increase the strength of such a shoring structure and to ensure a wide work space enclosed by the structure. A frame structure for retaining walls has been proposed.

The frame structure of the earth retaining wall described in Patent Document 1 comprises a wale horizontally mounted on the inner surface of the earth retaining wall and a hitch installed between the adjacent wale. The wales are composed of composite wales that combine multiple shaped steels with different cross-sectional dimensions. The composite wale consists of a central single beam and overlapping end beams connected to both ends of the central single beam. Furthermore, the ends of the linings are connected near the ends of the central single beam, and the joints of the end overlapping beams and the central single girders are positioned outside the joints with the linings.

JP 2014-159711

By the way, in the frame structure of Patent Document 1, end overlapping beams are joined to both ends of the central single beam. Become. The central single beam and the end overlapping beams are joined by bolts at their butted end faces. When these end faces are aligned, the shear force applied to the joints is applied mainly to the bolts and stilettos. Become. In this case, if the shear resistance strength of the bolts is insufficient, it is necessary to install more stilts.

SUMMARY OF THE INVENTION Accordingly, the main object of the present invention is to improve the shear resistance strength of the joint end face with a simple structure in a combined structure of steel materials that can be used for waling or the like.

As a result of intensive studies on means for solving the above problems, the inventors of the present invention found that in a combined structure in which polymerized steel is joined to the side surface of the main steel, the left and right end faces of the polymerized steel are extended from the left and right end faces of the main steel. For example, when the ends of the main steel material and another steel material (complementary steel material) are bolted together, the polymerized steel material can resist the shear force applied to the joint end surfaces. Based on the above findings, the inventors of the present invention have conceived that the problems of the prior art can be solved, and completed the present invention. Specifically, the present invention has the following configurations and steps.

A first aspect of the present invention relates to a combined structure of steel materials. The combined structure according to the present invention comprises straight main steel members 10 and polymer steel members 20 . The polymerized steel material 20 is arranged parallel to the main steel material 10 and joined to the side surface of the main steel material 10 . As the main steel material 10 and the polymerized steel material 20, well-known shaped steel such as I-type and H-type steel may be used. The main steel material 10 and the polymerized steel material 20 are joined with the left and right end faces 21 and 22 of the polymerized steel material 20 extending in the longitudinal direction beyond the left and right end faces 11 and 12 of the main steel material 10 . In order to ensure the length of the polymerized steel material 20, the polymerized steel material 20 may be formed by butting and welding the end faces of two or more shaped steels.

By extending both end surfaces of the polymerized steel material 20 from both end surfaces of the main steel material 10 as in the above configuration, it is possible to avoid a state in which the end surfaces of these steel materials 10 and 20 are flush with each other. Therefore, when the end faces of the main steel material 10 and another steel material are bolted together, the main body of the polymerized steel material 20 can receive the shearing force applied to the joint. Therefore, the combined structure as a whole can improve the shear resistance strength of the joint end faces.

In the combination structure according to the present invention, it is preferable that a reinforcing plate 30 is attached to the side surface of the polymerized steel material 20 . The reinforcement plate 30 is attached to a side of the polymerized steel 20 opposite to the side joined to the main steel 10 . By using the reinforcing plate 30 in this manner, the strength against the bending moment applied to the polymerized steel material 20 from the main steel material 10 side is enhanced, so that the strength of the entire combined structure can be efficiently increased.

In the combined structure according to the invention, the main steel member 10 may have one or more stiffeners 14 at least in the end region 13, which is the longitudinal extent extending from the left and right end faces 11, 12 to the reinforcing plate 30. preferable. Thereby, the strength of the main steel material 10 can be enhanced efficiently.

In the combined structure according to the present invention, it is preferred that the steel 20 has one or more stiffeners 24 in the end regions 23 extending at least from the left and right end faces 21, 22 to the reinforcing plate 30 in the longitudinal direction. . Thereby, the strength of the polymerized steel material 20 can be enhanced efficiently.

In the combined structure according to the present invention, the stiffeners 24 of the polymerized steel members 20 are preferably arranged on extension lines of both or either of the left and right end faces 11 and 12 of the main steel members 10 . As described above, a shearing force is applied to the end surfaces 11 and 12 of the main steel material 10. In the superposed steel material 20, the stiffeners 24 should be arranged on the extension lines of the end surfaces 11 and 12 of the main steel material 10. , the resistance strength against the shear force generated on the end surfaces 11 and 12 of the main steel material 10 can be effectively increased.

A second aspect of the present invention relates to a shoring structure. The earth retaining shoring structure includes an earth retaining wall 200 , a combined structure 100 of steel materials relating to the first side surface, and complementary steel materials 300 . The earth retaining wall 200 is erected so as to contact the excavated surface of the ground. In the combined structure 100, the main steel material 10 is positioned on the excavated surface side of the retaining wall 200, and the main steel material 10 and the superimposed steel material 20 are laid horizontally. The complementary steel material 300 is joined to the left and right end surfaces 11 and 12 of the main steel material 10 in a state where the end surfaces are butted against each other. In other words, the combined structure 100 and the complementary steel material 300 function as wale. It is not necessary to join other steel materials (such as H-shaped steel) to the ends of the polymerized steel materials 20 of the combined structure 100 . Thus, the combined structure 100 according to the present invention can be used as a wale in a shoring structure.

In the earth retaining shoring structure according to the present invention, the polymerized steel material 20 is provided with a flint beam 400 or a cut beam 400 in the end region 23 which is a longitudinal range from both or either of the left and right end faces 21 and 22 to the reinforcing plate 30. Preferably, the ends of beam 500 are joined. By joining the ends of the stilt beams 400 or the struts 500 to the end regions 23 of the polymerized steel material 20 in this way, the shear force generated at the joint end face between the main steel material 10 and the supplementary steel material 300 can be reduced. can effectively provide resistance.

In the combined structure according to the present invention, the polymerized steel material 20 has both or either of the regions 23a from the left and right end faces 21, 22 of the polymerized steel material 20 to the extension lines of the left and right end faces 11, 12 of the main steel material 10. The ends of the struts 400 or struts 500 may be joined. Thereby, the strength of the main steel material 10 can be further enhanced. As a result, it is possible to more effectively impart resistance to the shear force generated at the joint end face between the main steel material 10 and the complementary steel material 300 .

In the earth retaining shoring structure according to the present invention, the polymerized steel material 20 is formed by joining the ends of the stilt beam 400 or the strut 500 on the extension line of both or either of the left and right end faces 11, 12 of the main steel material 10. preferably. By doing so, it is possible to more effectively impart resistance to the shear force generated at the joint end face between the main steel material 10 and the complementary steel material 300 .

A third aspect of the present invention relates to a method for constructing the earth retaining shoring structure according to the second aspect. The construction method according to the present invention includes the steps of erecting the retaining wall 200 so as to abut on the excavated surface of the ground, and placing the complementary steel material 300 of the combined structure 100 on the excavated surface side of the retaining wall 2000 .

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to improve the shear resistance strength of a joint end face with a simple structure in a combined structure of steel materials that can be used for waling or the like.

FIG. 1 is an external perspective view showing an example of a combined structure of steel materials according to the present invention. FIG. 2 is a cross-sectional view of the combined structure shown in FIG. FIG. 3 is an external perspective view showing an example of the earth retaining shoring structure according to the present invention. FIG. 4 is a plan view of the earth retaining shoring structure shown in FIG. FIG. 5 is a plan view showing another example of the earth retaining shoring structure. FIG. 6 is a cross-sectional view showing an example of a combined structure used as a hobiki.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments for carrying out the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments described below, and includes appropriate modifications within the scope obvious to those skilled in the art from the following embodiments.

In the specification of the present application, when the expression "A to B" is used, it basically means "A or more and B or less". In addition, in the drawings of the present application, three-dimensional coordinates of XYZ are shown for easy understanding of the three-dimensional structure. The X-axis and Y-axis indicate plane directions, and the Z-axis indicates a three-dimensional direction (vertical direction).

[1. Combination structure of steel materials]
The configuration of a combined steel structure 100 will be described with reference to FIGS. 1 and 2. FIG. As shown in FIGS. 1 and 2, a combined structure 100 according to the present invention is constructed by bolting or welding a plurality of steel materials. Specifically, the combined structure 100 basically includes a straight main steel material 10 and an overlapping steel material 20 . In the example shown in FIG. 1, the main steel material 100 is composed of one steel material. On the other hand, the polymerized steel material 20 is formed by firmly connecting the end surfaces of the first steel material 20a and the second steel material 20b by welding or bolting. The main steel material 10 may also be formed by welding a plurality of steel materials like the polymerized steel material 20 . Moreover, the polymerized steel material 20 is not limited to those made of a plurality of steel materials, and may be made of one steel material as long as the length can be secured.

As the steel materials forming the main steel material 10 and the polymerized steel material 20, known shaped steel such as I-shaped steel and H-shaped steel can be used. In addition, it is possible to use steel materials with the same tensile strength, section modulus, etc. for these steel materials. Therefore, existing materials can be effectively used for the main steel material 10 and the polymerized steel material 20, and the cost for manufacturing the combined structure 100 can be kept low.

The polymerized steel material 20 is longer than the main steel material 10 in its longitudinal direction. As shown in FIG. 2, the length L2 of the main steel material 10 is preferably 50 to 95%, particularly preferably 70 to 90%, of the length L1 of the polymerized steel material 20.

As shown in FIGS. 1 and 2, the main steel material 10 and the polymerized steel material 20 are arranged in parallel, and the sides of the main steel material 10 and the polymerized steel material 20 are joined together. Bolt holes are formed at equal intervals in the side surfaces of the main steel material 10 and the polymer steel material 20, and the side surfaces of both steel materials 10 and 20 are joined by bolts. The side surfaces of both steel materials 10 and 20 may be joined by welding.

The main steel material 10 and the polymerized steel material 20 are joined together in a state in which the left and right end surfaces 21 and 22 of the polymerized steel material 20 extend longer than the left and right end surfaces 11 and 12 of the main steel material 10 . That is, in the longitudinal direction, a gap G1 exists between the left end face 11 of the main steel material 10 and the left end face 21 of the polymerized steel material 20, and similarly between the right end face 12 of the main steel material 10 and the right end face 22 of the polymerized steel material 20. There is a gap G2 in . Although it is preferable that the gap G1 and the gap G2 have the same size, they may have different sizes. For example, the gap G1 may be 80-120% longer than the gap G2. Also, the gaps G1 and G2 are preferably 3 to 25%, particularly preferably 5 to 20% or 10 to 15%, of the length L1 of the polymerized steel material 20, respectively. In this way, the gaps G1 and G2 are ensured to have a certain size or more. For example, the gaps G1 and G2 may be 300-3000 mm, 500-2500 mm, or 1000-2000 mm, respectively.

As shown in FIGS. 1 and 2, the combined structure 100 according to the present embodiment further includes a reinforcing plate 30. As shown in FIG. The reinforcing plate 30 is a plate-shaped steel plate for increasing the strength of the combined structure 100 . The reinforcement plate 30 is attached to a side surface of the polymerized steel member 20 that faces the side surface joined to the main steel member 10 . For example, the reinforcing plate 30 may be bolted or welded to the sides of the polymerized steel material 20 . The reinforcement plate 30 is preferably arranged in the center of the reinforcement plate 30 in the longitudinal direction. Moreover, when the polymerized steel material 20 is formed by joining two steel materials 20a and 20b, it is preferable to cover the joining portion of the two steel materials 20a and 20b with the reinforcing plate 30. As shown in FIG. The length P of the reinforcement plate 30 in the longitudinal direction is preferably 20-80% or 30-70% of the length L2 of the polymerized steel material 20 .

In this embodiment, the length ranges from the left and right end faces 11 and 12 of the main steel member 10 to the reinforcing plate 30 are defined as the end regions 13, respectively. The left and right end regions 13 of the main steel member 10 are each provided with one or more stiffeners 14 . The stiffener 14 has a surface parallel to the end surfaces 11 and 12 and extends from one side surface of the main steel material 10 to the other side surface. By arranging the stiffener 14 in the end region 13 in this way, the resistance to the pressure applied to the side surface of the main steel member 10 can be increased.

Similarly, the length ranges from the left and right end faces 21 and 22 of the polymerized steel material 20 to the reinforcing plate 30 are defined as end regions 23, respectively. One or more stiffeners 24 are provided in each of the left and right end regions 23 of the polymerized steel member 20 . The stiffener 24 has a surface parallel to the end surfaces 21 and 22 and extends from one side of the polymerized steel material 20 to the other side. By arranging the stiffeners 24 in the end regions 23 in this manner, the strength of the entire combined structure 100 can be increased.

Also, as shown in FIGS. 1 and 2, one of the stiffeners 24 provided on the polymerized steel material 20 is present on the extension line of the end faces 11 and 12 of the main steel material 10. As shown in FIGS. As a result, the stiffeners 24 of the polymerized steel material 20 can effectively increase the resistance strength against the shearing force generated in the end surfaces 11 and 12 of the main steel material 10 . Further, the stiffeners 24 of the other polymerized steel members 20 are preferably arranged on the extension line of the stiffeners 24 provided on the main steel member 10 .

[2. Earth retaining shoring structure]
Next, referring to FIGS. 3 to 5, a shoring structure constructed using the combined structure 100 described above will be described. In this embodiment, the combined structure 100 is used as a wale of the shoring structure.

When constructing an earth retaining shoring structure, first, a plurality of retaining walls 200 are driven into the ground, and these retaining walls 200 secure a rectangular parallelepiped (planar rectangular) working space. A plurality of earth retaining walls 200 are driven in along the direction of excavation (vertical direction) and arranged horizontally to form a wall surface without any gaps. In the examples shown in FIGS. 3 and 4, a substantially square working space is formed, and the retaining walls 200 defining the four sides have the same length. On the other hand, in the example shown in FIG. 5, the retaining walls 200 on the two opposite sides extend longer than the retaining walls 200 on the other two sides, and as a result, the retaining walls 200 on the four sides are enclosed. The workspace has a flat rectangular shape. As the earth retaining wall 200, it is preferable to adopt U-shaped, Z-shaped, H-shaped, or straight steel sheet piles. Further, the earth retaining wall 200 may be an SMW (Soil Mixing Wall) composed only of soil cement, or an SMW composed of soil cement and a core material (H-shaped steel, etc.) embedded in it. good. However, the earth retaining wall 200 may use known members such as other shaped steels and concrete piles.

After finishing driving all the retaining walls 200, while excavating the work area surrounded by the retaining walls 200, the combined structure 100 (walping) is placed on the excavated surface side of the retaining walls 200 on the four sides. ) and complementary steel material 300 are placed. At this time, the combined structure 100 is in a state in which the main steel members 10 are brought into contact with the retaining wall 200 and the main steel members 10 and the superimposed steel members 20 are horizontally arranged. Further, the left and right end surfaces 11 and 12 of the main steel material 10 are bolted while the end surfaces of the complementary steel material 300 are butted against each other. As a result, the complementary steel materials 300 are arranged on the extension line of the main steel material 10 . Also, as described above, since the polymerized steel 20 extends longitudinally from the end of the main steel 10 , part of the end surface of the polymerized steel 20 contacts the side of the complementary steel 300 . Therefore, it is preferable to bolt the side surface of the polymerized steel material 20 and the side surface of the complementary steel material 300 to each other. In this way, the main steel material 10, the polymerized steel material 20, and the two left and right complementary steel materials 300 are integrally joined, and the combined structure of these functions as a wale. In this way, when the wale (combined structure 100 and complementary steel material 300) is completely arranged, the wale has the function of supporting the earth retaining wall 200. In other words, even if a lateral pressure load such as earth pressure is applied to the retaining wall 200 from the excavated surface, the wales support the retaining wall 200 from the inside, causing the retaining wall 200 to tilt or the excavated surface to collapse. can be prevented.

At the corners of the working space, a strut beam 400 is installed between the adjacent wale. That is, one end of the flint beam 400 is joined to the side surface of the polymerized steel material 20 of a certain combination structure 100, and the other end of the flint beam 400 is joined to the side surface of the polymerized steel material 20 of another adjacent combination structure. . A known beam 400 can be used, and a jack for length adjustment may be provided.

Also, as shown in FIGS. 3 and 4, when installing the stilt beam 400, the end portion of the stilt beam 400 is placed on the end region 23 of the polymerized steel material 20 (from the end surfaces 21 and 22 to the reinforcing plate 30). length range). More specifically, in FIG. 4, symbol A indicates an extension line of the joint surface between the main steel material 10 and the complementary steel material 300 . In this case, it is preferable that the end of the stilt beam 400 is positioned on the extension line A of the joint surface of the main steel material 10 and the supplementary steel material 300 . By doing so, the flint beam 400 can effectively provide resistance to the shear force generated at the joint end face between the main steel material 10 and the complementary steel material 300 . Incidentally, as shown in FIG. 3, all or part of the ends of the flint beam 400 extend from the left and right end faces 21, 22 of the superposed steel member 20 to the extension lines of the left and right end faces 11, 12 of the main steel member 10. 23a (see FIG. 1).

In the earth shoring structure of the present invention, sufficient strength can be obtained by joining the complementary steel material 300 to the end face of the main steel material 10 of the combined structure 100. No materials need to be installed. As a result, material costs and construction costs can be kept low compared to conventional structures.

In the example of the shoring structure shown in Fig. 5, long wales are used to secure a long working space. In this case, a plurality of the above-described combination structures 100 connected in the longitudinal direction are used as the wale forming one side of the working space. As shown in FIG. 5, adjacent combined structures 100 are connected by bolting end surfaces of the polymerized steel materials 20 to each other. Further, in the adjacent combined structures 100, the complementary steel members 300 are interposed in the gaps formed between the main steel members 10. As shown in FIG. That is, the end surfaces of the main steel material 10 and the complementary steel material 300 are bolted, and the complementary steel material 300 is arranged between the two main steel materials 10 .

In addition, when a long wale is adopted, a large bending moment acts on the central part, so in order to suppress this, one or more A strut 500 is installed. The strut 500 may be bridged between the wales 2 with only one strut 500, or a plurality of struts 500 connected in the longitudinal direction may be bridged between the wales. may At this time, in order to reinforce the joint state between the wale and the strut 500, a strut 500 extending obliquely so as to connect the side surface of the wale and the strut 500 can be bolted. As the struts 500, known members such as steel pipes, square steel pipes, round steel pipes, and H-shaped steel pipes can be used. As shown in FIG. 5, when the struts 500 are arranged, the ends of the struts 500 must be aligned with the end regions 23 of the superposed steel material 20 (the length range from the end surfaces 21 and 22 to the reinforcing plate 30). ). More specifically, the ends of the struts 500 are preferably positioned on extensions of the joining surfaces of the main steel material 10 and the complementary steel material 300 . By doing so, the struts 500 can effectively provide resistance to the shear force generated at the joint end face between the main steel material 10 and the complementary steel material 300 .

[3. draw]
Next, with reference to FIG. 6, an example in which the combined structural body 100 of steel materials is used as a rope will be described. In the structure shown in FIG. 6, a combination structure 100 functioning as a hoist is horizontally installed so as to bridge between a plurality of columns 600 erected in the vertical direction. Since a heavy material such as a floor material is placed above the combined structure 100, pressure is applied to the combined structure 100 from above to below. For this reason, when the combined structure 100 is used as a hoist, the main steel material 10 is placed facing upward, the polymerized steel material 20 is placed below it, and the polymerized steel material 20 and the strut 600 are connected.

The side surfaces of the main steel material 10 and the polymerized steel material 20 are bolted together so that the left and right end faces 21 and 22 of the polymerized steel material 20 extend in the longitudinal direction beyond the left and right end faces 11 and 12 of the main steel material 10 . ing. Also, a complementary steel material 300 can be arranged to fill the gap between the end surfaces of the main steel material 10 and the polymerized steel material 20 . Further, a reinforcing plate 30 may be installed on the lower surface of the polymerized steel material 20 in the longitudinal direction.

In addition, as shown in FIG. 6, in the structure of this embodiment, the upper ends of the struts 600 are located in the end regions 23 of the polymerized steel material 20 (the length range from the end surfaces 21 and 22 to the reinforcing plate 30). preferably. More specifically, the ends of the struts 600 are preferably positioned on extensions of the joining surfaces of the main steel material 10 and the supplementary steel material 300 . By doing so, the struts 600 can effectively provide resistance to the shear force generated at the joint end face between the main steel material 10 and the complementary steel material 300 . All or part of the upper end of the strut 600 is joined to a region 23a (see FIG. 1) extending from the left and right end faces 21, 22 of the polymerized steel member 20 to the extension line of the left and right end faces 11, 12 of the main steel member 10. may be

As described above, the combined structural body 100 of steel materials according to the present invention can be used not only as a wale but also as a hoist. Further, the application of the combined structure 100 is not limited to these, and it can be widely used as a material for an erection structure.

As described above, in the specification of the present application, the embodiments of the present invention have been described with reference to the drawings in order to express the content of the present invention. However, the present invention is not limited to the above embodiments, and includes modifications and improvements that are obvious to those skilled in the art based on the matters described in the specification of the present application.

INDUSTRIAL APPLICABILITY The present invention can be suitably used, for example, in the civil engineering and construction industry, which is mainly engaged in temporary construction of shoring for earth retaining.

DESCRIPTION OF SYMBOLS 10... Main steel material 11... Left end surface 12... Right end surface 13... End area 14... Stiffener 20... Polymerized steel material 21... Left end surface 22... Right end surface 23... End area 24... Stiffener 30... Reinforcing plate 100... Combinatorial structure (Wale, Daibiki)
200... Earth retaining wall 300... Complementary steel material 400... Strike beam 500... Strut 600... Post

Claims (8)

a linear main steel material (10);
a linear polymerized steel member (20) arranged parallel to the main steel member (10) and joined to the side surface of the main steel member (10);
a reinforcing plate (30) attached to the side of the polymerized steel (20) opposite to the side joined to the main steel (10);
The left and right end faces (21, 22) of the polymerized steel material (20) extend longitudinally beyond the left and right end faces (11, 12) of the main steel material (10), and the left and right end faces of the polymerized steel material (20) In a state where gaps (G1, G2) exist between the surfaces (21, 22) and the left and right end faces (11, 12) of the main steel material (10), the main steel material (10) and the polymerized steel material (20) is joined,
Said main steel member (10) has one or more stiffeners (14) in its end region (13) which is a longitudinal range from at least said left and right end faces (11, 12) to said reinforcing plate (30). has a combinatorial structure. a linear main steel material (10);
a linear polymerized steel member (20) arranged parallel to the main steel member (10) and joined to the side surface of the main steel member (10);
a reinforcing plate (30) attached to the side of the polymerized steel (20) opposite to the side joined to the main steel (10);
The left and right end faces (21, 22) of the polymerized steel material (20) extend longitudinally beyond the left and right end faces (11, 12) of the main steel material (10), and the left and right end faces of the polymerized steel material (20) In a state where gaps (G1, G2) exist between the surfaces (21, 22) and the left and right end faces (11, 12) of the main steel material (10), the main steel material (10) and the polymerized steel material (20) is joined,
Said polymerized steel material (20) has one or more stiffeners (24) in its end regions (23) which are longitudinally extending from at least said left and right end faces (21, 22) to said reinforcing plate (30). has a combinatorial structure. The stiffeners (24) of the polymerized steel material (20) are arranged on extension lines of both or either of the left and right end faces (11, 12) of the main steel material (10). Combinatorial structure. An earth retaining wall (200) erected so as to abut against the excavated surface of the ground;
A linear main steel member (10) located on the excavation surface side of the earth retaining wall (200) and a linear superposition that is arranged parallel to the main steel member (10) and joined to the side surface of the main steel member (10) A combination structure (100 ) having a steel material (20), wherein the main steel material (10) and the polymerized steel material (20) are bridged in a state of being horizontally aligned, wherein the polymerized steel material (20) The left and right end faces (21, 22) extend in the longitudinal direction from the left and right end faces (11, 12) of the main steel material (10), and are aligned with the left and right end faces (21, 22) of the superposed steel material (20). The main steel material (10) and the polymerized steel material (20) are joined with gaps (G1, G2) between the left and right end faces (11, 12) of the main steel material (10). ，
An earth retaining shoring structure comprising a supplementary steel material (300) joined to the left and right end faces (11, 12) of the main steel material (10) in a state where the end faces are butted against each other. A reinforcing plate (30) is attached to the side surface of the polymerized steel material (20) opposite to the side surface joined to the main steel material (10),
The polymerized steel material (20) is provided in an end region (23) which is a longitudinal range from both or either of the left and right end faces (21, 22) of the polymerized steel material (20) to the reinforcing plate (30). 5. The shoring structure according to claim 4 , wherein the ends of the stilts (400) or struts (500) are joined. The polymerized steel material (20) extends from the left and right end surfaces (21, 22) of the polymerized steel material (20) to the extension line of the left and right end surfaces (11, 12) of the main steel material (10), or either one of them. An earth shoring structure according to claim 5 , wherein the ends of the struts (400) or struts (500) are joined to the regions (23a). Said polymerized steel material (20) has the ends of stilt beams (400) or struts (500) joined on the extension line of both or either of the left and right end faces (11, 12) of said main steel material (10). The earth retaining shoring structure according to any one of claims 4 to 6 . A method for constructing an earth retaining shoring structure according to claim 4 ,
a step of erecting the earth retaining wall (200);
arranging the combined structure (100) and the complementary steel material (300) on the excavated surface side of the earth retaining wall (200).

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