JP2016205126A - Earth-retaining support method, and earth-retaining support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth-retaining support method and an earth-retaining support structure to be assembled readily, and capable of pre-loading a waling material sufficiently and forming a wide penetrated region.SOLUTION: Integrating connection units 1a to 1d are provided at a central part of waling materials 12a to 12d. The integrating connection unit 1a connects the waling material 12a with angle ties 3a, 3b, the integrating connection unit 1b connects the waling material 12b with angle ties 3b, 3c, the integrating connection unit 1c connects the waling material 12c with angle ties 3c, 3d, and the integrating connection unit 1d connects the waling material 12d with angle ties 3d, 3a. The integrating connection units 1a to 1d function respectively as a part of the angle ties 3a to 3d and the waling materials 12a to 12d.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mountain-clamping support method and a mountain-clamping support structure capable of applying a sufficient preload to an erection material by simple assembly and forming a wide penetration region.

  Conventionally, when constructing an underground structure or the like, a mountain retaining method for supporting an excavation area with a temporary material is performed. For example, when forming an excavation area having a rectangular shape in plan view, a steel sheet pile or the like is continuously driven into the root cut surface of the excavation area to form a retaining wall, and the root excavation is performed at a predetermined depth above the excavation area. After doing so, the angling material is attached to the steel sheet pile, and the beams are arranged in a lattice shape, or the fire-fired material is arranged in the corners to suppress the displacement of the retaining wall.

  As this mountain retaining support method, Patent Document 1 describes that a rectangular frame-shaped erection material is excluded from a corner fired beam part, and another erection material is bolted as a laminated beam, and the erection erection is overlapped. A material in which a PC steel material is arranged in a material cross section and prestress is introduced is described.

JP 50-47410 A

  By the way, in a general mountain retaining method, a beam (orthogonal beam) orthogonal to the wall surface of the mountain wall is installed. Specifically, the cut beams are arranged in a lattice pattern at intervals of about 5 to 10 m. Therefore, a wide penetrating region is not formed between the upper part and the lower part where the cut beams are arranged, and carrying out of excavated soil excavated in the lower part and carrying in and out of materials and equipment to the lower part are restricted.

  On the other hand, in the above-described support method for retaining a mountain described in Patent Document 1, a beam or the like is not required at the center of the excavation area, and excavation work is facilitated. However, the structure for introducing the prestress into the upset material is complicated, and the installation work is troublesome.

  In addition, it is possible to suppress the deformation of the retaining wall with a firewood material instead of the beam. In this case, a wide penetration area can be formed at the center of the rectangular area in plan view of the excavation area, and excavation soil can be carried out and materials and equipment can be carried in and out of the lower part. However, the fire striking material close to the formed penetrating region is stretched between the central parts of the erection material and becomes long, and a large axial force (preload) cannot be applied to the central part of the erection material. .

  The present invention has been made in view of the above, and can be applied with a sufficient amount of preload to the flank material by simple assembly, and can also form a wide penetrating region, and a mountain retaining support method and a mountain retaining support. The purpose is to provide a structure.

  In order to solve the above-described problems and achieve the object, the mountain retaining support method according to the present invention integrates the central portion of the flank material and the ends of a plurality of fire-fired materials projecting from different directions. It is characterized in that the displacement of the retaining wall is suppressed through an integrated coupling unit coupled together.

  Further, in the above-mentioned invention, the mountain support method according to the present invention is such that the integrated coupling unit is formed of a plurality of fire striking materials projecting from different directions on the flank member coupled to the flank member. The shaft centers are coupled by intersecting with the integrated coupling unit.

  Further, in the above-mentioned invention, the mountain support method according to the present invention is such that the integrated coupling unit is formed of a plurality of fire striking materials projecting from different directions on the flank member coupled to the flank member. The end portions are connected to each other at a distance.

  Moreover, the mountain support method according to the present invention is characterized in that, in the above-mentioned invention, the displacement of the mountain retaining wall is suppressed only by the bulging material, the fire striking material, the jack, and the integrated coupling unit.

  Moreover, the mountain retaining method according to the present invention is characterized in that, in the above invention, the integrated coupling unit is divided into members having a width and a length that can be transported, and the divided members are used in combination. To do.

  Moreover, the mountain retaining support structure according to the present invention includes a mountain retaining wall via an integrated coupling unit that integrally couples the central portion of the erection material and the ends of the plurality of fire striking materials protruding from different directions. It is characterized by suppressing the displacement of.

  According to the present invention, the displacement of the mountain retaining wall is suppressed through the integrated coupling unit that integrally couples the central portion of the erection material and the ends of the plurality of fire striking materials protruding from different directions. Therefore, it is possible to apply a sufficient preload to the erection material with a simple assembly and to form a wide penetrating region.

FIG. 1 is a plan view showing a mountain retaining method according to an embodiment of the present invention. FIG. 2 is a perspective view showing the configuration of the integrated coupling unit shown in FIG. FIG. 3 is a diagram showing a comparison between a case where a mountain retaining is supported only by a conventional orthogonal beam and a case where a mountain retaining is performed using an integrated coupling unit and a fire striking material according to the present embodiment. FIG. 4 is a plan view showing a mountain retaining method when the shape in plan view surrounded by the mountain retaining wall is a rectangle, which is a modification of the present embodiment. FIG. 5 is an explanatory view showing an example of division and assembly of the integrated coupling unit shown in FIG. 6 is an explanatory diagram showing an example of division and assembly of the integrated coupling unit provided on the long side of the integrated coupling unit shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a plan view showing a mountain retaining method according to an embodiment of the present invention. As shown in FIG. 1, in this mountain retaining support method, first, a mountain retaining wall 11 (11a to 11d) is continuously driven into a root cut surface of a columnar space whose plan view is a square, and the root cut is performed by a predetermined upper depth. After performing this, the angling material 12 (12a to 12d) is attached to each inner surface of the mountain retaining wall 11 (11a to 11d). After that, the fire striking material 2 (2a to 2d) is sequentially arranged from the corner portion 13 (13a to 13d) toward the central axis C of the columnar space. The fire stroking material 2 is perpendicular to the bisector of the corner portion 13 and is interposed between the bulging members 12 adjacent to the corner portion 13 with a fire striking angle of 45 °. The brazing material 12 is supported. For example, in the corner portion 13a, the fired material 2a that is lengthened is sequentially interposed between the erection materials 12a and 12d.

  The integrated coupling unit 1 (1a to 1d) is disposed in the central portion of each erection material 12 (12a to 12d). The integrated coupling unit 1 unifies and couples the flank material 12 and the end portions of each of the hot-fired materials 3 (3a to 3d) protruding from the adjacent flank material 12. For example, the integrated coupling unit 1a includes the flank member 12a and the ends of the fired materials 3a and 3b protruding from the flank members 12d and 12b attached to the adjacent retaining walls 11d and 11b. Combine and combine.

  As shown in FIG. 2, the integrated coupling unit 1 a has coupling portions 7 and 6 that couple the ends of the flame-fired materials 3 a and 3 b that protrude from different directions on the erection member 5. The flank member 5 is abutted against and coupled to the flank members 12a on both sides. On the other hand, as described above, the joining portions 6 and 7 join the end portions of the fire hitting materials 3b and 3a. These connections are fastened by, for example, bolting using a plate-like member as necessary. In addition, the connection parts 6 and 7 have a structure which has the intensity | strength which receives the axial force from the axial center of the flame hitting materials 3b and 3a, respectively. That is, it is preferable that the integrated coupling unit 1 can appropriately reduce bending deformation and bending stress using a highly rigid member.

  Further, as shown in FIG. 1, for example, an intersection point P between the axis A1 of the firing material 3a and the axis A2 of the firing material 3b is formed in the structure of the integrated coupling unit 1a. The compression forces F1 and F2 from the shaft centers A1 and A2 act as compression forces F21 and F22 to the back side orthogonal to the mountain retaining wall 11a, and suppress deformation at the central portion of the mountain retaining wall 11a.

  Here, in the case where the firing materials 3a and 3b are crossed at the central portion of the erection material 12a, the erection material 12a needs to have two steps in the vertical direction. However, when the integrated coupling unit 1a is used, The raised material 12a can be completed in one stage.

  In addition, you may make it the integral coupling | bonding unit 1 provide the burning material 4 (4a-4d) between the burning materials 2 and 3 as needed. In this case, the firing material 4 is coupled on the integrated coupling unit 1.

  If the integrated coupling unit 1 is not used and the support member is supported only by the flank material 12 and the flame blasting material 2, the length of the flame blast material disposed at the center of the flank material 12 is increased. If the length of the firewood is increased, it may buckle and a large axial force cannot be applied. As a result, it is not possible to reliably support the central portion of the uprising material 12 through the fired material. In order to shorten the buckling length, it is conceivable to shorten the firing material. In this case, however, a connecting material for reinforcement is required separately.

  On the other hand, in the present embodiment, since the integrated coupling unit 1 forms a part of the fire-raising material and the air-raising material disposed in the central portion of the erection material 12, the fire pit actually interposed is formed. The length of the material can be shortened. As a result, a large axial force can be applied to the central portion of the erection material 12. In addition, since the integrated coupling unit 1 can easily perform the coupling operation between the plurality of fire striking materials and the erection material, the plurality of fire striking materials can be easily assembled.

  Further, in the present embodiment, since the axial force is transmitted to and supported by the uprising material only by the fire striking materials 2, 3 and 4, the central portion of the excavation area around the central axis C of the excavation area is supported. A wide penetration region E1 can be formed, and excavation soil can be carried out, and materials and equipment can be carried in and out of the lower part easily.

  Here, FIG. 3 is a diagram showing a case where the pile is supported by only the conventional orthogonal beam 41 and a case where the pile is supported using the integrated coupling unit 1 and the fired material 42 according to the present embodiment. The fired material 42 corresponds to the fired materials 2, 3, and 4. Further, in FIG. 3, a buckling stopper 43 that reinforces the space between the fire striking materials 42 is provided.

  In the case where the square in a plan view shape surrounded by the retaining wall is 40 m × 40 m, the total length of the orthogonal beam 41 and the erection material 61 according to the conventional retaining support method shown in FIG. The total length of the steel material of the fire striking material 42, the erection material 62, and the integrated coupling unit 1 according to the mountain retaining support method of the present embodiment shown in FIG. It becomes. Note that auxiliary members such as the length material 71 shown in FIG. 3A and the buckling stopper 43 shown in FIG. 3B are excluded from the total length. Since the cross-section of the fire striking material 42 is larger than the cross-section of the orthogonal beam 41, the total weight of the steel material is not necessarily proportional to the total length, but the mountain retaining support method according to the present embodiment can reduce the steel material.

  Further, in FIG. 3A, it is necessary to provide a beam post 51 extending in the vertical direction at the intersection of the orthogonal beam 41. Similarly, in FIG. 3B, since the buckling stopper 43 is used, it is necessary to provide the beam support 52 at the intersection between the buckling stopper 43 and the fire striking material 42. However, in the mountain retaining support method according to the present embodiment shown in FIG. 3 (b), the wide penetrating region E1 is formed in the central portion, so that the number of the beam support columns 52 can be reduced. Specifically, the number of beam support columns 51 shown in FIG. 3A is 25, whereas the number of beam support columns 52 shown in FIG. 3B is 24.

  In the embodiment described above, the planar view shape surrounded by the mountain retaining wall is a square. FIG. 4 is a plan view showing a mountain retaining method when the shape in plan view surrounded by the mountain retaining wall is a rectangle, which is a modification of the present embodiment. 1 is different from the mountain retaining support method shown in FIG. 1 in that integrated coupling units 8a and 8c are provided in place of the integrated coupling units 1a and 1c arranged at the central portions of the long side protuberances 12a and 12c. Yes. Since the shape of the plan view is rectangular, the fired material 3 close to the central axis C has a space at the center of the long side protuberances 12a and 12c. For this reason, the coupling parts 6 and 7 of the integrated coupling unit 8 (8a, 8c) are formed at positions separated from each other on the provoked member 5. In addition, when a space | gap arises further in the center part of the flank materials 12a and 12c, as shown in FIG. 4, you may interpose the cross beam 9 between the center parts of the flank materials 12a and 12c. Even in this case, two wide penetration regions E2 can be formed.

  In addition, in embodiment mentioned above, axial force (preload) is introduce | transduced by interposing a jack in a fire striking material.

  By the way, depending on the shape of the excavation plane, the dimensions of the integrated coupling units 1 and 8 may increase, which may hinder transportation and mounting. In this case, the integrated coupling units 1 and 8 are divided into members that can be transported, and assembled and attached after transporting.

  For example, as shown in FIG. 5A, the width WA of the integrated coupling unit 1 is larger than the width W (for example, W = 2.3 m) of the transportation platform, and the length DA is the length D of the transportation platform. In the case of less than (for example, D = 9.5 m), the width direction of the integrated coupling unit 1 is divided so that the width WA is less than the width W as shown in FIG. In FIG.5 (b), it divides | segments into the division | segmentation unit 21 by the side of an erection material, and the division | segmentation unit 22 by the side of a burning material. The width WB of the division unit 21 is less than the width W. On the other hand, the splitting unit 22 on the side of the firing material has an X shape that further extends the side of the firing material. The divided units 21 and 22 after transport are assembled in the ground yard. As shown in FIG. 5C, the integrated coupling unit 1 ′ after the assembly is joined with high strength bolts at the joints 24 and 25. The joints 24 and 25 are welded as necessary. The joints 24 and 25 ensure the rigidity required for the integrated coupling unit 1 ′.

  Further, for example, as shown in FIG. 6 (a), when the width WC of the integrated coupling unit 8 is less than the width W of the transportation platform and the length DC is larger than the length D of the transportation platform, it is particularly long. When the length DC is slightly less than three times the length D, the length direction of the integrated coupling unit 8 is divided so that the length DC is less than the length D, as shown in FIG. In FIG.6 (b), it is set as the division | segmentation unit 81,82,83 divided into 3 in the length direction. The length DD of each divided unit 81, 82, 83 is less than the length D. The divided units 81, 82, 83 after transport are assembled in the ground yard. As shown in FIG. 6C, the assembled integrated unit 8 ′ is joined with high strength bolts at the joint portions 84 and 85. In the case where the joint portions 84 and 85 are designed to be continuous beams, the flange portions are friction-joined by welding or using a cover plate. The joints 84 and 85 can ensure the rigidity required for the integrated coupling unit 8 '. The integrated coupling unit 8 is not limited to three divisions, and may be two divisions or four or more divisions. In either case, the length DD may be less than the length D. Further, the length of the division may be different, and it is preferable to divide at a position where the bending moment becomes small in calculation.

  In addition, when the ground yard for assembling of each divided unit cannot be taken, it may be constructed directly on condition that assembly strength can be secured.

  In addition, when each divided unit is used, a joining plate or the like is used at the joint, but the total length and the total weight of the steel material are reduced as compared with the conventional case, as in the case of using an integrated coupling unit that is not divided. Can do.

1, 1 ', 1a to 1d, 8, 8', 8a, 8c Integrated coupling unit 2, 2a to 2d, 3, 3a to 3d, 4, 4a to 4d, 42 Fire-fired material 5 Raised member 6, 7 Joint portion 9 Beam 11, 11 a to 11 d Mountain retaining wall 12, 12 a to 12 d, 61, 62 Raised material 13, 13 a to 13 d Corner portion 21, 22, 81, 82, 83 Split unit 24, 25, 84, 85 Joint 41 Right angle beam 43 Buckling prevention 51, 52 Beam post 71 Long length material E1, E2 Through area

Claims (6)

  A mountain retaining support characterized in that the displacement of the retaining wall is suppressed through an integrated coupling unit that integrally couples the central portion of the flank material and the ends of a plurality of fire striking materials protruding from different directions. Construction method.   In the integrated coupling unit, on the flank member coupled to the flank member, the shaft centers of a plurality of fire striking materials protruding from different directions are crossed and coupled by the integral coupling unit. The mountain retaining support method according to claim 1, wherein   The integrated coupling unit is characterized in that, on an erection member coupled to an erection material, the ends of a plurality of fire striking materials projecting from different directions are respectively separated and coupled. The mountain retaining support method according to 1.   4. The mountain retaining support method according to any one of claims 1 to 3, wherein displacement of the mountain retaining wall is suppressed only by the erection material, the fire striking material, a jack, and the integrated coupling unit.   The said integrated coupling unit is divided | segmented into the member of the width | variety and length which can be conveyed, and the divided member is used as a grounding support, The mountain retaining support as described in any one of Claims 1-4 characterized by the above-mentioned. Construction method.   A mountain retaining support characterized in that the displacement of the retaining wall is suppressed through an integrated coupling unit that integrally couples the central portion of the flank material and the ends of a plurality of fire striking materials protruding from different directions. Construction.

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