JP6676341B2 - Sandome support structure and construction method - Google Patents

Description

  The present invention relates to a structure of a shoring support used for preventing a ground excavation surface from collapsing and a method of constructing the structure. More specifically, the present invention relates to a shoring support structure that does not use fire beams.

  FIG. 7 shows a conventional shoring support structure. As shown in FIG. 7 (a), when retaining a mountain, first, a plurality of retaining walls 1 are driven into the ground, and an area which becomes a rectangular parallelepiped (planar rectangular) working space by the retaining walls 1 is formed. Secure. After that, while excavating the area surrounded by the plurality of retaining walls 1, the plurality of bellies 3 are brought into contact with the inner surface side of each retaining wall 1 and fixed. At this time, a corner piece 2 is arranged at the intersection of the prongs 3 corresponding to the four corners of the working space, and two orthogonal prongs 3 are bolted to one corner piece 2. . In this way, by setting the protuberance 3 inside each retaining wall 1, it is possible to prevent the retaining wall 1 from tilting even when the excavation of the ground proceeds. However, when a large pressure is applied to the earth retaining wall 1 from the excavated surface of the ground, a large bending moment acts on the belly 3 that supports the earth retaining wall 1. Therefore, in order to prevent the belly 3 from being deformed or damaged, fire beams 4 for supporting the belly 3 are installed at least at the four corners of the working space. The fire struts 4 are arranged at the four corners where the belly 3 intersects, and one fire strut 4 is bolted to the inside of the two orthogonal struts 3. As described above, in the general mountain retaining structure, in order to suppress deformation of the belly 3 due to the pressure generated from the excavation surface side and secure the safety in the work space, the fire struts 4 are used. Was considered necessary. Alternatively, if the fire beam 4 is not used, it is necessary to increase the size of the cross section of the belly 3 and suppress the deformation of the belly 3 due to the pressure generated from the excavation surface side.

  FIG. 7B shows an example in which a relatively long belly 3 is used to form the work space horizontally long. As shown in FIG. 7 (b), when a long prong 3 is employed, a large bending moment acts on the central portion thereof. And one or more cutting beams 5 are installed. At this time, in order to reinforce the joint between the bulge 3 and the cutting beam 5, it has been considered preferable to bolt the fire beam 4 that extends in an oblique direction between the bulging 3 and the cutting beam 5. .

JP 2010-216121 A JP 2015-175226 A

  However, when the fire beam 4 is erected as in the conventional shoring structure shown in FIG. 7, there is a problem that the work space is hindered by the fire beam 4 and the workable space is narrowed. In order to secure a large working space, the fire beam 4 may be removed. However, when the fire beam 4 is removed, the four corners where the retaining wall 1 intersects are not restrained from rotating, so that the stake retaining structure has an incomplete planar shape. Will be. In addition, in a situation where the batter beam 4 does not exist, when a lateral pressure load such as an earth pressure is applied, the belly 3 is greatly deformed, so that the planar shape cannot be maintained structurally. It cannot function as a wall. It is also conceivable to omit the batter 4 by increasing the size of the cross-section of the bulge 3, but with the improvement in the size of the bulge 3, the working space eventually becomes narrower, and furthermore, the material The cost will increase and the workability of the construction of the shoring will decrease. As described above, it has been said that it is difficult to ensure a wide working space and to stably maintain the planar shape of the shoring support structure.

  In view of this, the present invention omits the blow beam and secures a wide work space, suppresses the deformation of the bulge even when the fire beam is not used, and stably maintains the planar shape of the work space. It is an object of the present invention to provide a structure of a shoring support and a method of constructing the same.

  The inventors of the present invention have made intensive studies on means for solving the problems of the prior art, and as a result, provided flat L-shaped corner members at at least four corners of a work space defined by a plurality of retaining walls, and provided the corner members. Invented a structure that supports the earth retaining wall by connecting the belly to the stomach. By providing flat L-shaped corner members at the four corners of the working space and joining the protruding parts to the protruding parts, the bending moment acting on the protruding parts can be suppressed. It is possible to maintain the planar shape of the shoring support structure without using the conventional beam. And since it becomes possible to omit the battering beam, the shoring support structure of the present invention can provide a wide working space. The present inventors have conceived that the problems of the prior art can be solved based on the above findings, and have completed the present invention. More specifically, the present invention has the following configurations and steps.

A first aspect of the present invention relates to a shoring support structure for preventing collapse of excavated ground.
The shoring support structure of the present invention basically includes a plurality of earth retaining walls 10, a plurality of corner members 20, and a plurality of bulges 30. The plurality of retaining walls 10 are erected so as to be in contact with the excavated surface of the ground. The plurality of corner members 20 are planar L-shaped members arranged at least at four corners of a work space defined by the plurality of retaining walls 10. The corner member 20 is joined (for example, bolted) to the inner surface of the retaining wall 10. In addition, the plurality of prongs 30 are joined to the corner member 20 and are horizontally hung so as to support the retaining wall 10 from the inner surface side. More specifically, the planar L-shaped corner member 20 has a structure having two joining arms 21 and 22, and the end face of the tip of each joining arm 21 and 22 is protruded from the end face of the joining arm 21 and 22. The two may be joined in the state of contact.

  As described above, in the shore retaining structure of the present invention, a flat L-shaped corner member 20 is provided at each of the four corners of the working space, and the bulge 30 is joined to the corner member 20 to support the retaining wall 10. ing. More specifically, by connecting the protruding portion 30 to the flat L-shaped corner member 20 to which the two connecting arms 21 and 22 are rigidly connected, the maximum bending moment acting on the central portion of the protruding portion 30 is reduced. It becomes possible to suppress. As described above, since the flat L-shaped corner member 20 has substantially the same effect as the blown beam, even when the fired beam is not used, the corner member 20 can be sufficiently bent to suppress deformation of the corner 30. . Furthermore, since a fire beam can be omitted, a wide working space can be secured inside the retaining wall 10.

  In the shoring support structure of the present invention, the planar L-shaped corner member 20 has a shape having two orthogonal connecting arms 21 and 22. In the present invention, a blow beam is installed between the bulge 30 joined to the first joint arm 21 of the certain corner member 20 and the bulge 30 fixed to the second joint arm 22. Preferably, it is not. As described above, one of the features of the present invention is that it is possible to provide a shore retaining structure that does not use a blow beam.

In mountain distillate shoring structure of the present invention, the length L ₁ of each joint arms 21, 22 of the corner member 20, the length L ₂ of the wale 30 bonded to the bonding arm 20% or more It is preferred that The length _{L 1} is the length _{L 2,} may be 30% or more or 40% or more.

As the above configuration, by ensuring a relatively long length L ₁ of the bonding arm 21, 22 of the corner member 20, it is possible to secure the strength at the four corners, the bending moment can be suppressed to act on the wale 30 . In particular, in the case where a hitting beam is conventionally used for the shore retaining structure, the maximum bending moment applied to the belly 30 can be kept in the range of 50% to 70% as compared with the case where no hitting beam is used. It was deemed necessary. In this regard, as in the present invention, in the case of using a flat L-shaped corner members 20, the length L ₁ of each joint arms 21, 22 of the corner member 20 to the length L ₂ of the wale 30 By setting it to 20% or more, it becomes possible to reduce the maximum bending moment applied to the belly 30 to a range of 50% to 70% as in the case of using a blown beam. As described above, when the flat L-shaped corner member 20 is used instead of the fire beam, the length of each of the joint arms 21 and 22 of the corner member 20 becomes important.

  The shoring support structure of the present invention preferably further includes at least a pair of relay tools 40 and one or more cutting beams 50 in addition to the above configuration. The relay tool 40 has a flat T-shaped structure disposed at a position facing the inner side of the retaining wall 10. Further, the cutting beam 50 is joined so as to bridge between a pair of flat T-shaped relay tools 40. In this case, the relay tool 40 and the corner member 20 are joined with the belly 30 so as to bridge between them.

  By providing the flat T-shaped relay tool 40 and the cutting beam 50 as in the above configuration, even if the length of the protruding portion 30 becomes long, the protruding portion 30 is formed by the cutting beam 50. Can be reinforced. Therefore, even when a lateral pressure load such as an earth pressure is applied, the deformation of the belly 30 can be suppressed.

  In the shoring support structure of the present invention, the relay tool 40 has a first flat L-shaped relay member 41 and a second flat L-shaped relay member 42, which are joined to each other to form a flat surface. It is preferable to have a T-shaped structure. That is, the T-shaped relay device 40 is formed by combining two L-shaped relay members 41 and 42. In this way, the metal fittings functioning as the corner members 20 can be diverted as the relay members 41 and 42. As a result, it is not necessary to prepare a plurality of metal fittings having different shapes, so that the work efficiency on site can be improved. In addition, a large bending moment is generated in the protruding portion 30 at the portion where the relay tool 40 is disposed. However, the T-shaped relay tool 40 is joined to the two L-shaped relay members 41 and 42 ( By employing a structure in which bolts are connected, for example, the reinforcing effect of the belly 30 is improved, and breakage or destruction of the relay tool 40 can be more effectively prevented.

  The shoring support structure of the present invention preferably further includes a reinforcing plate 60 and / or an overlapping beam 70. The reinforcing plate 60 and the overlapped beam 70 are joined to the belly 30 and exert an effect of reinforcing the belly 30. As described above, by using the reinforcing plate 60 and the overlap beam 70, the rigidity of the belly 30 can be increased.

A second aspect of the present invention relates to a method for constructing a shoring support structure according to the first aspect.
The method of constructing the retaining wall includes a step of erecting a plurality of retaining walls 10 (first step) and disposing a plurality of planar L-shaped corner members 20 at four corners of a work space defined by the plurality of retaining walls 10. (A second step), and a step of joining the plurality of prongs 30 to the corner member 20 and horizontally extending the prongs 30 so as to support the retaining wall 10 (a third step). .

  As described above, according to the shore retaining structure and the method for constructing the shoring support structure of the present invention, it is not necessary to use a blow beam, so that a wide working space can be secured. In addition, even when a fire beam is not used, the deformation of the bulge can be suppressed and the planar shape of the working space can be stably maintained.

FIG. 1 is a plan view of the shoring support structure according to the first embodiment. FIG. 2 conceptually shows a comparison of a bending moment acting on the belly when a flat L-shaped corner member is used and when a corner piece for pin connection is used. FIG. 3 shows a plan view of the shoring support structure according to the second embodiment. In the second embodiment, a flat T-shaped relay tool is used. FIG. 4 shows an application example of the shore retaining structure according to the present invention. In the application example shown in FIG. 4, a reinforcing plate is employed to reinforce bulging. FIG. 5 shows another application example of the shoring support structure according to the present invention. In the application example shown in FIG. 5, an overlapped beam is employed to reinforce bulging. FIG. 6 shows a further application example of the shore retaining structure according to the present invention. In the application example shown in FIG. 6, a reinforcing plate and a cutting beam are used in combination. FIG. 7 shows a conventional shoring support structure using a blown beam.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, but also includes those which are appropriately modified by those skilled in the art from the following embodiments.

  FIG. 1 shows a plan view of a shoring support structure 100 according to a first embodiment of the present invention. The shoring support structure 100 shown in FIG. 1 is a basic form of the present invention. When constructing the shore retaining structure 100, first, a plurality of retaining walls 10 are driven into the ground, and an area serving as a rectangular parallelepiped (planar rectangular) working space is secured by the retaining walls 10. The plurality of retaining walls 10 are driven along the excavation traveling direction (vertical direction), and are arranged side by side in the horizontal direction to form a wall surface with no gap. In the example shown in FIG. 1, the length of each retaining wall 10 is substantially the same, and as a result, the work space surrounded by the retaining wall 10 also has a substantially planar square shape. As the retaining wall 10, it is preferable to adopt a steel sheet pile of a U shape, a Z shape, an H shape, a straight shape, or the like. Also, the retaining wall 10 may be an SMW (Soil Mixing Wall: Soil Cement Wall) composed of only soil cement, or an SMW composed of Soil Cement and a core material (H-section steel or the like) embedded in it. Good. However, the retaining wall 10 may use a known member such as another shaped steel or concrete pile.

  After all the retaining walls 10 have been driven in, the plane L-shaped corner members 20 are arranged at at least four corners of the working space while excavating the working area surrounded by the retaining wall 10. As shown in FIG. 1, the corner member 20 has two connecting arms 21 and 22, which are orthogonal to each other to form a plane L-shape. The corner members 20 are arranged at the intersections of the two retaining walls 10 at the four corners of the working space, and the corners of the corner members 20 are located at the intersections of the two retaining walls 10. For this reason, the corner member 20 is arranged so that the first joint arm 21 abuts on the one retaining wall 10 and the second joint arm 22 abuts on the other retaining wall 10. At this time, for example, the first joint arm 21 of the corner member 20 is welded to one of the retaining walls 10, and the second joint arm 22 is welded to the other retaining wall 10, so that each of the retaining walls 10 The corner member 20 may be fixed to the inner surface of the base member. By fixing the corner member 20 to the retaining wall 10 in this way, the stability of the retaining structure 100 of the present invention is improved.

  The flat L-shaped corner member 20 may be formed by rigidly joining two linear shaped steel members by welding or the like, or may be formed by using an L-shaped molded steel member in advance. “Shaped steel” is divided into heavy-duty shaped steel made by hot rolling and lightweight shaped steel made by bending a thin steel plate cold. Means heavy section steel. Since high rigidity is required for the corner member 20, it is preferable to use a shaped steel made of a highly rigid metal such as steel.

  After the flat L-shaped corner member 20 is installed at a predetermined location, a belly 30 is joined to the corner member 20. In the example shown in FIG. 1, one belly 30 is hung horizontally between two corner members 20. In other words, the flank 30 is joined to one joint arm of one corner member 20, and the other end is joined to the joint arm of another corner member 20. A known method of joining the corner member 20 and the belly 30 to the corner member 20 may be a known method such as bolt joining or welding, but is not limited to these methods. In the example of FIG. 1, the corner member 20 and the belly 30 are bolted to each other in order to facilitate the dismantling of the shoring support structure 100 after the completion of the construction. Specifically, a bolt hole is provided on each end face where the corner member 20 and the belly 30 abut, and a bolt 31 having an appropriate diameter is inserted into the bolt hole and tightened with a nut 32. , The corner member 20 and the belly 30 can be joined. When the joining of each corner member 20 and each belly 30 is completed, each belly 30 has a function of supporting the retaining wall 10. In other words, even when a lateral pressure load such as earth pressure is applied to the retaining wall 10 from the excavated surface, the bulge 30 supports the retaining wall 10 from the inside, thereby tilting the retaining wall 10 and reducing the excavation surface. Can prevent collapse. In addition, as the bulge 30, a known section steel such as an I-type or an H-type can be used.

  The bucking support structure of the present invention employs a rigid joining member as the corner member 20, so that even when a lateral pressure load is applied to the retaining wall 10, a bending moment is applied to the corner member 20. Has little effect. The bending moment gradually increases from the junction between the corner member 20 and the belly 30 toward the center of the belly 30, but the corner members 20 having high rigidity are arranged at both ends of the belly 30. By doing so, the maximum moment acting on the belly 30 can be suppressed. For this reason, it is sufficient for the retaining structure 100 of the present invention to have the retaining wall 10, the corner member 20, and the bulge 30 described above, and the conventional retaining structure shown in FIG. In the case of the support structure, the installation of the required blow beam 4 which is required can be omitted. For this reason, as shown in FIG. 1, in the present invention, the work space defined by the retaining wall 10 can be utilized as widely as possible.

  FIG. 2 shows a comparison between a case where the flat L-shaped corner member 20 is adopted and a case where the corner piece 2 for pin bonding is adopted. As shown in FIG. 2, in the shoring support structure employing the corner piece 2, the bending moment starts to act from the four corners of the working space and becomes maximum at the center of the bulge 3. The maximum bending moment in this case is assumed to be 1.0. On the other hand, in the buckling support structure 100 employing the flat L-shaped corner member 20, the bending moment hardly acts on the four corners of the working space, and the corner member 20 and the bulge 30 protrude from the joint point. 3 gradually increases toward the center. For example, when the flat L-shaped corner member 20 is used, the maximum bending moment acting on the belly 30 is about 0.6, which is greatly reduced as compared with the case where the corner piece 2 is used. I understand. Specifically, when the planar L-shaped corner member 20 is employed, the bending moment acting on the belly 30 can be calculated using a portal-type rigid frame (fixed column base) structure model. As a result, compared to a simple beam structure calculation, the maximum bending moment obtained by the calculation of the beam structure fixed at both ends is 50% from the relationship between the beam length and the column base length, that is, the ratio of the short side to the long side. % To 70%. Due to such calculated characteristics, the shoring support structure 100 of the present invention uses an H-shaped steel flared material under the same conditions (the same grade, size, and specifications) as the conventional shoring support structure. Even if there is, it will have an advantage over the conventional shoring support structure. That is, since the bending moment acting on the belly 30 can be sufficiently suppressed by using the flat L-shaped corner member 20, the shoring support structure 100 can be provided without setting a support such as a blown beam. It is possible to maintain a planar shape.

FIG. 2 illustrates a preferred relationship between the length of the corner member 20 and the length of the belly 30. In Figure 2, the length of the bonding arms 21 and 22 constituting the corner member 20 is indicated by reference numeral _{L 1,} the length of the wale 30 bonded to the bonding arm 21 and 22 by reference numeral _{L 2} shown Have been. In this case, the length _{L 2} of the wale 30 is taken as 100%, the length _{L 1} of the joint arms 21 and 22 is preferably 20% or more. Maximum bending moment in this way, by setting the length L ₁ of at least the bonding arm 21, 22 to 20% or more, to the same extent as the case of adopting the angle brace beam as in the conventional structure, acting on the wale 30 Can be suppressed. That is, as described above, by employing the corner member 20 having such a length, the maximum bending moment is set to a value of 50% to 70% as compared with the case where the corner piece 2 for pin connection is used. It becomes possible. Conversely, if the length L ₁ of the joint arm 21 and 22 is less than 20%, there is a fear that deformation wale 30 by the lateral pressure load of the soil pressure or the like, shoring, such angle brace beams and Setsuhari There is a problem that a work space becomes narrower. For this reason, it is important to secure the length of the joint arms 21 and 22 of the corner member 20 to a certain value or more. In particular, the length _{L 1} of the joint arm 21 and 22, the length of the wale 30 _{L 2} with respect to 25% or more, 30% or more, preferably 35% or more, or 40% or more. The upper limit of the length _{L 1} of the joint arm 21 and 22 is not particularly limited, for example, may be 50% or less. Specific examples of the length L1 of the joint arms 21 and 22 are ₁ m to 3 m or 1.5 m to 2 m.

  FIG. 3 shows a second embodiment of the shoring support structure according to the present invention. The second embodiment is a structure for securing a work space in a planar rectangular shape. Specifically, in the second embodiment, a horizontally long work space about twice as large as that of the first embodiment (FIG. 1) is secured.

  As shown in FIG. 3, in the second embodiment, of the four wall surfaces formed by the retaining wall 10, two wall surfaces extend long in the lateral direction, and the long wall surfaces are formed. A flat T-shaped relay tool 40 is installed on the inner surface of the retaining wall 10. Two relay tools 40 are provided in a pair, and are installed at positions facing each other. The relay tool 40 is formed in a flat T-shape having three connecting arms 40a, 40b, and 40c, and can protrude 30 or the cut beam 50 at the end face of each connecting arm. Specifically, the first joint arm 40a of the relay tool 40 has a belly 30 joined so as to bridge between the corner member 20 and the second joint arm 40b. The bulge 30 is joined so as to bridge between the corner member 20 and the third joint arm 40c, and the cutting beam 50 is joined to the third joint arm 40c so as to bridge between the relaying tool 40 and the third joint arm 40c. Have been. When the retaining wall surface (retaining wall 10) is formed to be long in this manner, one or a plurality of T-shaped relay tools 40 are provided between the two corner members 20 to provide a pair of the retaining members. By joining the cutting beam 50 between the relay tools 40, the wall surface thereof can be reinforced.

  The relay tool 40 only needs to be configured in a flat T-shape, and it is also possible to use a shaped steel preformed in a T-shape. However, as shown in FIG. 3, it is preferable that the relay tool 40 be formed in a T-shape by combining two flat L-shaped relay members 41 and 42. Specifically, the flat T-shaped relay tool 40 can be assembled by putting two flat L-shaped joining arms back to back and integrally joining them by welding or bolting. The flat L-shaped corner member 20 described above can be diverted as the flat L-shaped relay members 41 and 42. Therefore, it is not necessary to prepare a plurality of types of metal fittings (shape steel) at the construction site, and an L-shaped metal fitting (shape steel) may be used as the corner member 20 or the relay member 41, 42 can be selected. As a result, work efficiency on site can be improved. In addition, a large bending moment is generated in the bulging portion 30 at the portion where the relay tool 40 is disposed, but a T-shaped relay tool 40 in which two L-shaped relay members 41 and 42 are joined. By using the above, the effect of reinforcing the belly 30 can be improved, and further, the breakage or destruction of the relay tool 40 can be prevented. Therefore, it is preferable to use a combination of the flat L-shaped relay members 41 and 42 as the flat T-shaped relay tool 40.

  FIG. 4 shows an application example of the retaining wall structure according to the present invention. As shown in FIG. 4, a flat reinforcing plate 60 can be joined to the belly 30 on the inner side (work space side) and / or the outer side (digging surface side). The joint between the reinforcing plate 60 and the belly 30 is preferably a bolt joint. As described above, by attaching the reinforcing plate 60 to the middle of the protruding portion 30, the rigidity of the protruding portion 30 can be improved. Therefore, even when the length of the belly 30 is increased, the belly 30 is less likely to be deformed by the lateral pressure load.

Further, by improving the material properties of the belly 30 and increasing its rigidity, it is possible to increase its length. Specifically, it is preferable to use SM490 material (rolled steel for a welding structure having a tensile strength of 490 N / mm ² and 50 kg / mm ² belonging to JIS G3106) as the belly 30.

FIG. 5 shows another application example of the retaining wall structure according to the present invention. As shown in FIG. 5, a reinforcing overlap beam 70 can be joined to the inside of the belly 30 (on the working space side). As shown in FIG. 5, the overlap beam 70 includes a beam main body 71 and corner pieces 72 attached to both ends thereof. Beam body 71 and two corner pieces 72 is bolted to the wale 30. Further, the two corner pieces 72 at both ends of the beam body 71 may be bolted. In this manner, by attaching the overlap beam 70 to the middle of the bulge 30, the rigidity of the bulge 30 can be improved. Therefore, even when the length of the belly 30 is increased, the belly 30 is less likely to be deformed by the lateral pressure load. Further, each corner piece 72 is a flat right triangle, one of the two sides forming a right angle abut the end surface of the beam body 71, the other is in contact with the wale 30, the The hypotenuse faces outward. If you place only the beam body 71 without placing a corner piece 72, occurs a sudden change in cross-section at the site where the beam body 71 is joined, wale stress is concentrated on both sides of the beam body 71 There is a possibility that cracks or breakage may occur in the work 30. In contrast, by leaving arranged plane rectangular triangular corner pieces 72 on either side of the beam body 71, it is possible to prevent the stress concentration due to sudden changes of such cross-section. In the example shown in FIG. 5, although the beam body 71 and the corner pieces 72 are separate members, it may be a member integrally molded.

  In addition, the overlap beam 70 shown in FIG. 5 can be attached to the prong 30 and the reinforcing plate 60 shown in FIG. The combination of the overlap beam 70 and the reinforcing plate 60 can further improve the rigidity of the belly 30.

  FIG. 6 shows a further application example of the shore retaining structure according to the present invention. In the example shown in FIG. 6, of the four wall surfaces formed by the retaining wall 10, two wall surfaces extend long in the lateral direction, and the central portion of the protruding bulge 30 on the long wall surface side. , The above-mentioned reinforcing plate 60 is attached. Also, between the reinforcing plate 60 and the corner members 20 at the four corners, two cutting beams 50 are formed on the bulging 30 so as to bridge between the pair of bulging 30 to which the reinforcing plate 60 is attached. They are joined in an orthogonal state. In this way, by using the reinforcing plate 60 and the cutting beam 50 in combination, the belly 30 can be further reinforced to prevent deformation. The reinforcing plate 60 shown in FIG. 6 can be replaced with the above-mentioned overlapping beam 70.

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

  The present invention relates to a structure of a shoring support used for preventing a ground excavation surface from collapsing and a method of constructing the structure. In particular, the present invention provides a shoring support structure that does not require a striking beam. Therefore, the present invention can be suitably used in the civil engineering and construction industry mainly for temporary construction of a shoring support.

DESCRIPTION OF SYMBOLS 10 ... Retaining wall 20 ... Corner members 21 and 22 ... Joint arm 30 ... Prong 31 ... Bolt 32 ... Nut 40 ... Joint tool 40a, 40b, 40c ... Joint arm 41, 42 ... Joint member 50 ... Cut beam 60 ... Reinforcement Plate 70: Overlapping beam 71: Beam main body 72: Corner piece 100: Sandome support structure

Claims (7)

A plurality of retaining walls (10) erected to abut the excavated surface of the ground,
A plurality of planar L-shaped corner members (20) arranged at four corners of a working space defined by the plurality of retaining walls (10) , wherein two linear shaped steel members are rigidly joined. One that is or is previously shaped into a flat L-shape ,
A plurality of prongs (30) joined to the corner member (20) and horizontally hung so as to support the retaining wall (10). The flat L-shaped corner member (20) has a shape having two orthogonal connecting arms (21, 22).
Between the bulge (30) joined to the first joint arm (21) of the corner member (20) and the bulge (30) fixed to the second joint arm (22), The shoring support structure according to claim 1, wherein a fire beam is not erected. The length (L ₁ ) of each joint arm (21, 22) of the corner member (20) is 20 times larger than the length (L ₂ ) of the belly (30) joined to the joint arm. %. The shoring support structure according to claim 2. At least one pair of flat T-shaped relay tools (40) arranged at opposing positions on the inner surface side of the retaining wall (10);
A cutting beam (50) joined so as to bridge over the pair of flat T-shaped relay tools (40).
3. The shoring support according to claim 1, wherein the relay tool (40) and the corner member (20) are joined with the bulge (30) so as to bridge between them. 4. Construction. The relay tool (40) has a first planar L-shaped relay member (41) and a second planar L-shaped relay member (42), which are joined together to form a planar T-shaped. The shoring support structure according to claim 4. 6. The device according to claim 1, further comprising: a reinforcing plate (60) joined to the protuberance (30) for reinforcing the protuberance (30); and / or an overlapping beam (70). 7. The shoring support structure according to any one of the above. A method for constructing a shoring support structure according to any one of claims 1 to 6,
Erecting the plurality of retaining walls (10);
At the four corners of the working space defined by the plurality of retaining walls (10), a plurality of planar L-shaped corner members (20) , which are two linear shaped steel members rigidly joined. Or a step of arranging what is a shaped steel previously formed into a flat L-shape ;
Joining a plurality of prongs (30) to the corner member (20), and bridging the prongs (30) horizontally so as to support the retaining wall (10). Construction method of construction structure.

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