JP4440799B2 - Ground excavation method - Google Patents

Description

  The present invention relates to a ground excavation method.

  Conventionally, in the earth retaining excavation work, (1) a method of incorporating the earth retaining wall to the impermeable layer, or (2) without embedding the earth retaining wall to the impermeable layer, There is a method for improving the bottom plate of the excavation surface (see, for example, Patent Document 1).

JP 2000-130066 A

  In addition, excavation is performed while installing a beam or anchor according to the excavation stage. In addition, there are cases where measures against water flow are taken because the earth retaining wall blocks the groundwater flow.

  However, the improvement of the bottom plate, the installation of retaining walls, and the installation of anchors and beams are a temporary construction, but occupy a large proportion of the total construction cost and material cost. In addition, when water supply measures are taken, it is more expensive.

  This invention is made | formed in view of such a problem, The place made into the objective is to provide the excavation method of the ground which can reduce the cost concerning temporary construction and does not require a water flow countermeasure.

  The first invention for achieving the above-mentioned object is the step (a) of installing a retaining wall so that a predetermined length of the upper part protrudes from the ground surface along the circumference of the excavation surface of the ground, A step (b) of extending water in the excavation surface to a position higher than the ground surface, and a step (c) of excavating the excavation surface underwater while maintaining the water level. In (a), a core material such that a predetermined length of the upper part protrudes from the ground surface, a water-impervious member for maintaining water-stopping between the core materials in the ground, and the core material The ground excavation method is characterized in that a water-impervious plate material arranged in a cylindrical shape along the inside of a portion having a predetermined upper portion is installed along the periphery of the excavation surface.

  The second invention includes a step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the circumference of the ground excavation surface; A step (b) of extending water to a position higher than the surface, and a step (c) for underwater excavation in the excavation surface while maintaining the water level, wherein the step (a) In addition, a step (d) of installing a core material and a water-impervious member for keeping water-stopping between the core materials along the periphery of the excavation surface, and an upper end portion of the core material, A step (e) of adding a core material of a predetermined length, and installing a water-impervious plate member in a cylindrical shape along the inside of the core material of a predetermined length on the upper part. Excavation method.

  In the second invention, after the step (e), a step (f) of excavating the excavation surface to a predetermined depth may be further provided.

  In the second invention, a step (g) of excavating the excavation surface to a predetermined depth may be further provided between the step (d) and the step (e).

  According to a third aspect of the present invention, there is provided a step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the circumference of the ground excavation surface; A step (b) of extending water to a position higher than the surface, and a step (c) for excavating the inside of the excavation surface while maintaining the water level, wherein the step (a) A step of installing a core material having a predetermined length protruding from the ground surface and a water-impervious member for keeping water-stopping between the core materials in the ground along the circumference of the excavation surface ( h), a step (i) of excavating the inside of the excavation surface to a predetermined depth, and installing a water-impervious plate material in a cylindrical shape along the inner side of the upper portion of the core with a predetermined length A ground excavation method characterized by comprising the step (j) of:

  According to a fourth aspect of the present invention, there is provided a step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the periphery of the ground excavation surface; A step (b) of extending water to a position higher than the surface, and a step (c) for underwater excavation in the excavation surface while maintaining the water level, wherein the earth retaining wall is formed on the excavation surface. A predetermined interval is provided along the outer peripheral surface of the water-impervious plate material installed in the cylindrical shape along the outer edge and the outer surface of the water-impervious plate material installed in the cylindrical shape so that the vertical direction is the member axial direction. A ground excavation method comprising: a plurality of installed core members; and a water-impervious member installed in the ground for maintaining water-stopping between the core members. The water shielding member is soy mortar or the like.

The fifth invention includes a step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the periphery of the ground excavation surface; Projecting from the ground surface of the retaining wall, comprising a step (b) of extending water to a position higher than the surface, and a step (c) of underwater excavation in the excavation surface while maintaining the water level. The ground excavation method is characterized in that an erection is installed on the outer wall surface side of the portion, and an anchor is installed between the opposed erections.
According to a sixth aspect of the present invention, there is provided a step (a) of installing a retaining wall so that a predetermined length of an upper portion protrudes from the ground surface along the periphery of the ground excavation surface; Projecting from the ground surface of the retaining wall, comprising a step (b) of extending water to a position higher than the surface, and a step (c) of underwater excavation in the excavation surface while maintaining the water level. The ground excavation method is characterized in that an erection and a holding structure are installed on the outer wall surface side of the portion.
The seventh invention includes a step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the periphery of the ground excavation surface; Projecting from the ground surface of the retaining wall, comprising a step (b) of extending water to a position higher than the surface, and a step (c) of underwater excavation in the excavation surface while maintaining the water level. This is a ground excavation method characterized in that a stile beam is installed on the outer wall surface side of the part.

  In the present invention, after installing the retaining wall so that the predetermined length of the upper part protrudes from the ground surface along the periphery of the excavation surface of the ground, water is filled in the excavation surface to a position higher than the ground surface. The ground is excavated by excavating the excavation surface underwater while maintaining the water level.

  ADVANTAGE OF THE INVENTION According to this invention, the cost concerning temporary construction can be reduced and the ground excavation method which does not require a water flow countermeasure can be provided.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view of the earth retaining wall 17 installed on the ground 1. The earth retaining wall 17 includes the core material 3, the iron plate 5, the soil mortar 6, the uplift 7, the anchor 9, and the like.

  The core material 3 is installed along the periphery of the excavation surface 2 at a predetermined interval so that the vertical direction is the member axial direction. The iron plate 5 is installed in a cylindrical shape inside a plurality of core members 3 surrounding the excavation surface 2. The iron plate 5 is installed in a range from the upper end portion of the core material 3 to slightly below the surface 15 of the ground 1 (about GL-1m). The soil mortar 6 is installed around the core material 3 in the ground 1. The flank 7 is installed along the outside of the core member 3 protruding from the surface 15 of the ground 1. When the excavation surface 2 is rectangular, the uplifts 7 are installed on the four sides of the excavation surface 2. The anchor 9 is installed between the opposite erections 7.

  When the retaining wall 17 as shown in FIG. 1 is formed, for example, an SMW or TRD method is used to construct the underground portion of the retaining wall 17. In order to form the earth retaining wall 17, for example, while excavating a groove in the ground 1 along the outer edge of the excavation surface 2, cement slurry or the like is mixed with the excavated soil and the soil mortar 6 is filled into the groove. Then, after the core material 3 is built in the soil mortar 6, the iron plate 5 is installed inside the core material 3. Further, the belly 7 is installed outside the core member 3, and the anchor 9 is installed between the belly 7.

  FIG. 2 is a vertical cross-sectional view of the earth retaining wall 17 with water 11 in the interior. After the earth retaining wall 17 is formed as shown in FIG. 1, water 11 is spread in the excavation surface 2 (FIG. 1) as shown in FIG. The steel plate 5 of the earth retaining wall 17 maintains the water stoppage between the adjacent core members 3 when the water 11 is stretched. Further, the erection 7 and the anchor 9 prevent deformation of the retaining wall 17 due to the water pressure of the water 11.

  FIG. 3 is a vertical sectional view of the retaining wall 17 in a state where the excavation inside has been completed, and FIG. 4 is a perspective view of a part of the retaining wall 17 in a state where the excavation inside has been completed. As shown in FIG. 2, after water 11 is laid in the excavation surface 2, the ground 1 in the excavation surface 2 is excavated underwater to the planned excavation position 24 as shown in FIGS. 3 and 4. While excavating the ground 1, the water level of the water 11 is maintained such that the water surface 13 is higher than the surface 1 of the ground 1. The soil mortar 6 of the earth retaining wall 17 keeps the water stoppage between the adjacent core members 3 during underwater excavation.

  FIG. 5 is a diagram showing each step for constructing a frame in the earth retaining wall 17. FIG. 5A is a vertical sectional view of the retaining wall 17 in a state where the excavation inside has been completed, and corresponds to the state of FIG. FIG. 5B is a diagram showing a process of assembling the steel shell caisson 35.

  3 and FIG. 5 (a), after the excavation in the retaining wall 17 is finished, the steel shell caisson 35 is placed in the retaining wall 17 as shown in FIG. 5 (b). The water 11a is poured into the steel shell caisson 35. Further, the steel shell caisson 35 is assembled while water 11a is poured into the interior.

  FIG. 5C is a diagram illustrating a process of bottoming the steel shell caisson 35, and FIG. 5D is a diagram illustrating a state in which the construction of the housing is completed. After the assembly of the steel shell caisson 35 is completed, the steel shell caisson 35 is grounded to the bottom portion 26 of the excavation surface 2 as shown in FIG. And after draining the water 11 in the earth retaining wall 17 and the water 11a in the steel shell caisson 35, as shown in FIG. 5 (d), the ground 1a in the excavation surface 2 is backfilled, and the earth retaining wall Remove 17 and complete the construction of the enclosure.

  Thus, in 1st Embodiment, the water 11 is spread | tensioned to the position higher than the surface 15 of the ground 1 inside the earth retaining wall 17, and the ground 1 is excavated underwater. During excavation, the main earth pressure 19 applied to the retaining wall 17 is countered by the hydraulic pressure 21 of the water 11 and the passive earth pressure 23 of the ground in the excavation surface 2. The water pressure of the water 11 can be reduced from 19 to 19 and the specifications of the retaining wall 17 can be lowered.

  That is, even when there is groundwater in the ground 1, it is not necessary for the lower end of the retaining wall 17 to reach the impermeable layer, and the length of the retaining wall 17 is reduced. In addition, there is no need to improve the bottom slab to prevent water stoppage. Furthermore, it is not necessary to install a beam or anchor on the retaining wall 17 during excavation. According to the first embodiment, the cost can be reduced by omitting these temporary works.

  Next, a second embodiment will be described. FIG. 6 is a diagram showing each step of forming the retaining wall 17 and excavating the inside of the excavation surface 2. FIG. 6A is a diagram illustrating a process of forming the retaining wall 17 c in the ground 1.

  In the second embodiment, first, a retaining wall 17c is formed in the ground 1 as shown in FIG. The earth retaining wall 17c includes the underground portion of the core material 3 of the earth retaining wall 17 shown in FIG. In order to form the earth retaining wall 17c, for example, while excavating a groove in the ground 1 along the outer edge of the excavation surface 2, cement slurry or the like is mixed into the excavated earth and sand, and the soil mortar 6 is filled into the groove. And the core material 3 of the length of the underground part is built in the soil mortar 6.

  FIG. 6B is a diagram illustrating a process of forming the earth retaining wall 17d. The earth retaining wall 17 d includes the ground portion of the core material 3, the iron plate 5, the bellows 7, and the anchor 9 of the earth retaining wall 17 shown in FIG. 4. In order to form the earth retaining wall 17d, the ground portion of the core material 3 is added on the underground portion of the core material 3. And the iron plate 5 shown in FIG. Further, the belly 7 is installed outside the core 3, and the anchor 9 is installed between the belly 7.

  In the second embodiment, as shown in FIGS. 6A and 6B, a retaining wall 17d is formed above the previously formed retaining wall 17c, and the retaining wall is formed. Complete the wall 17.

  FIG. 6C is a diagram illustrating a process of excavating the inside of the excavation surface 2. After the earth retaining wall 17 is formed as shown in FIG. 6 (b), the height of the water surface 13 is the surface of the ground 1 inside the earth retaining wall 17, as shown in FIG. 6 (c). Water 11 is stretched so that the position is higher than 15.

  FIG. 6D is a diagram illustrating a state where excavation of the excavation surface 2 is completed. In the step shown in FIG. 6D, the ground 1 in the excavation surface 2 is excavated to the planned excavation position 24. While excavating the ground 1, the water level of the water 11 is maintained.

  In the second embodiment, after the excavation of the excavation surface 2 is completed, a frame is constructed in the retaining wall 17 by the same method as in the first embodiment.

  Next, a third embodiment will be described. FIG. 7 is a view showing each step of forming the earth retaining wall 17 and excavating the inside of the excavation surface 2. FIG. 7A is a diagram showing a process of forming the retaining wall 17c in the ground 1, and FIG. 7B is a diagram showing a process of forming the retaining wall 17d.

  FIG. 7A and FIG. 7B correspond to FIG. 6A and FIG. 6B of the second embodiment. In the third embodiment, first, as shown in FIG. 7A and FIG. 7B, FIG. 6A and FIG. 6B of the second embodiment. A retaining wall 17d is formed above the previously formed retaining wall 17c by the same method as described with reference to the drawings, and the retaining wall 17 is completed.

  FIG. 7C is a diagram illustrating a process of excavating the inside of the excavation surface 2. After the earth retaining wall 17 is formed as shown in FIG. 7B, the inside of the excavation surface 2 is excavated as shown in FIG. 7C. At the time of excavation, if necessary, the water 11 is filled in the retaining wall 17 to a water level lower than the surface 15 of the ground 1, and the underwater excavation is performed while maintaining the height of the water surface 13a. The excavation may be performed without adding water 11. Regardless of which method is used for excavation, excavation is performed to the depth of the retaining wall 17 in the step shown in FIG.

  FIG. 7D is a diagram showing a state where excavation of the excavation surface 2 is completed. After excavating the inside of the excavation surface 2 to a predetermined depth as shown in FIG. 7 (c), the height of the water surface 13 is set inside the retaining wall 17 as shown in FIG. 7 (d). The water 11 is stretched so as to be higher than the surface 15 of the ground 1. Then, the ground 1 in the excavation surface 2 is excavated to the planned excavation position 24. While excavating the ground 1, the water level of the water 11 is maintained.

  In the third embodiment, after the excavation of the excavation surface 2 is completed, a frame is constructed in the retaining wall 17 by the same method as in the first embodiment.

  Next, a fourth embodiment will be described. FIG. 8 is a diagram showing each step of forming the retaining wall 17 and excavating the excavation surface 2. FIG. 8A is a diagram illustrating a process of forming the retaining wall 17 c in the ground 1.

  In the fourth embodiment, first, a retaining wall 17c is formed in the ground 1 as shown in FIG. In FIG. 8A, the earth retaining wall 17c is formed by the same method as in FIG. 6A of the second embodiment.

  FIG. 8B is a diagram illustrating a process of excavating the inside of the excavation surface 2. After the earth retaining wall 17c is formed as shown in FIG. 8A, the inside of the excavation surface 2 is excavated as shown in FIG. 8B. At the time of excavation, if necessary, the water 11 is filled in the retaining wall 17c to a level lower than the surface 15 of the ground 1, and the underwater excavation is performed while maintaining the height of the water surface 13a. The excavation may be performed without adding water 11. Regardless of which method is used for excavation, excavation is performed to the depth of the retaining wall 17c in the step shown in FIG. 8B.

  FIG. 8C is a diagram illustrating a process of forming the earth retaining wall 17d. In FIG. 8 (c), after excavating the excavation surface 2 to a predetermined depth as shown in FIG. 8 (b), the same as FIG. 6 (b) of the second embodiment. The earth retaining wall 17d is formed above the earth retaining wall 17c by the method, and the earth retaining wall 17 is completed. Then, after the earth retaining wall 17 is formed, water 11 is stretched in the earth retaining wall 17 so that the height of the water surface 13 is higher than the surface 15 of the ground 1.

  FIG. 8D is a diagram illustrating a state where excavation of the excavation surface 2 is completed. In the step shown in FIG. 8D, the ground 1 in the excavation surface 2 is excavated to the planned excavation position 24. While excavating the ground 1, the water level of the water 11 is maintained.

  In the fourth embodiment, after the excavation of the excavation surface 2 is completed, a frame is constructed in the retaining wall 17 by the same method as in the first embodiment.

  Next, a fifth embodiment will be described. FIG. 9 is a diagram showing each step of forming the retaining wall 17 and excavating the excavation surface 2. FIG. 9A is a diagram illustrating a process of forming the retaining wall 17e on the ground 1.

  In the fifth embodiment, first, a retaining wall 17e is formed on the ground 1 as shown in FIG. The earth retaining wall 17e is composed of the core material 3 and the soil mortar 6 of the earth retaining wall 17 shown in FIG. In order to form the earth retaining wall 17e, for example, while excavating a groove in the ground 1 along the outer edge of the excavation surface 2, cement slurry or the like is mixed into the excavated soil and the soil mortar 6 is filled into the groove. And the core material 3 of the length shown in FIG.

  FIG. 9B is a diagram illustrating a process of excavating the inside of the excavation surface 2. After the earth retaining wall 17e is formed as shown in FIG. 9 (a), the inside of the excavation surface 2 is excavated as shown in FIG. 9 (b). At the time of excavation, if necessary, the water 11 is put in the retaining wall 17e to a height lower than the surface 15 of the ground 1, and the underwater excavation is performed while maintaining the height of the water surface 13a. The excavation may be performed without adding water 11. Regardless of which method is used for excavation, excavation is performed to the depth of the retaining wall 17e in the step shown in FIG. 9B.

  FIG. 9C is a diagram illustrating a process of forming the retaining wall 17. After excavating the inside of the excavation surface 2 to a predetermined depth as shown in FIG. 9B, as shown in FIG. 9C, the inside of the core 3 of the retaining wall 17e is shown in FIG. The iron plate 5 shown in FIG. Further, the belly 7 is installed outside the core member 3, and the anchor 9 is installed between the belly 7 to complete the earth retaining wall 17. In the step shown in FIG. 9C, after the earth retaining wall 17 is formed, the water 11 is placed in the earth retaining wall 17 so that the height of the water surface 13 is higher than the surface 15 of the ground 1. Hang.

  FIG. 9D is a diagram showing a state where excavation of the excavation surface 2 is completed. In the step shown in FIG. 9D, the ground 1 in the excavation surface 2 is excavated to the planned excavation position 24. While excavating the ground 1, the water level of the water 11 is maintained.

  In the fifth embodiment, after the excavation of the excavation surface 2 is completed, a frame is constructed in the retaining wall 17 by the same method as in the first embodiment.

  In the second to fifth embodiments, similarly to the first embodiment, the water 11 is stretched to a position higher than the surface 15 of the ground 1 inside the retaining wall 17 and the ground 1 is excavated underwater. During excavation, the main earth pressure 19 applied to the retaining wall 17 is countered by the hydraulic pressure 21 of the water 11 and the passive earth pressure 23 of the ground in the excavation surface 2. The water pressure of the water 11 can be reduced from 19 to 19 and the specifications of the retaining wall 17 can be lowered.

  That is, even when there is groundwater in the ground 1, it is not necessary for the lower end of the retaining wall 17 to reach the impermeable layer, and the length of the retaining wall 17 is reduced. In addition, there is no need to improve the bottom slab to prevent water stoppage. Furthermore, it is not necessary to install a beam or anchor on the retaining wall 17 during excavation. Also in the second to fifth embodiments, the cost can be reduced by omitting these temporary works.

  The structure of the earth retaining wall is not limited to that shown in FIGS. FIG. 10 is a perspective view of a part of another earth retaining wall 17a. The earth retaining wall 17a shown in FIG. 10 has substantially the same configuration as the earth retaining wall 17, but the anchor 9 is not installed and the retaining structure 25 is installed.

  The holding structure 25 includes a horizontal member 29 installed on the ground 1 and a diagonal member 27 installed between the horizontal member 29 and the bulge 7. The retaining wall 17a can be applied to any of the first to third embodiments, and is formed by a method substantially similar to the retaining wall 17. The retaining structure 25 is installed before the water 11 is stretched in the retaining wall 17a in order to prevent deformation of the retaining wall 17a due to the water pressure of the water 11.

  FIG. 11 is a perspective view of a part of another earth retaining wall 17b. The earth retaining wall 17b shown in FIG. 11 has substantially the same configuration as the earth retaining wall 17, but the belly rise 7 and the anchor 9 are not installed, and the stile beam 31 is installed.

  The stile beam 31 includes, for example, a concrete main body 32 and a PC steel wire 33 embedded in the main body 32. The stile beam 31 is installed along the outside of a portion of the core member 3 protruding from the surface 15 of the ground 1. For example, when the excavation surface 2 is rectangular, the stile beam 3 has a rectangular frame shape. The retaining wall 17b can be applied to any of the first to third embodiments, and is formed by a method substantially similar to the retaining wall 17. In order to prevent deformation of the retaining wall 17b due to the water pressure of the water 11, the stile beam 31 is installed before the water 11 is stretched in the retaining wall 17b.

  In the earth retaining wall, the member that stops the ground portion between the adjacent core members 3 and the member that stops the underground portion are not limited to the iron plate 5 and the soil mortar 6, respectively. Any material may be used as long as it has water-imperviousness and strength so that the excavation surface 2 can be excavated with the water 11 in the retaining wall 17.

  Moreover, the method of constructing a frame in the earth retaining wall is not limited to that shown in FIG. FIG. 12 is a diagram illustrating each process for constructing a frame in the earth retaining wall 17 by another method. FIG. 12A is a vertical sectional view of the retaining wall 17 in a state where the excavation inside has been completed, and corresponds to the state of FIG. FIG. 12B is a diagram illustrating a process of assembling the RC housing 39.

  As shown in FIGS. 3 and 12A, after the excavation in the retaining wall 17 is finished, a floating body 37 is floated on the water 11 as shown in FIG. 12B. Then, the RC housing 39 is assembled inside the floating body 37.

  FIG. 12C is a diagram illustrating a process of bottoming the RC housing 39, and FIG. 12D is a diagram illustrating a state in which the construction of the housing is completed. After the assembly of the RC housing 39 is completed, as shown in FIG. 12 (c), the RC housing 39 is sunk by its own weight and is settled on the bottom portion 26 of the excavation surface 2. And after draining the water 11 in the earth retaining wall 17, as shown in FIG.12 (d) figure, the ground 1a in the excavation surface 2 is refilled, the earth retaining wall 17 is removed, and construction of a frame is carried out. Complete.

  FIG. 13 is a diagram showing each process for constructing a frame in the earth retaining wall 17 by another method. FIG. 13A is a vertical sectional view of the retaining wall 17 in a state where the excavation inside has been completed, and corresponds to the state of FIG. FIG. 13B is a diagram showing a process of installing the beam 41 and the bottom slab 43 in the excavation surface 2.

  As shown in FIGS. 3 and 13 (a), after the excavation in the retaining wall 17 is finished, underwater concrete is placed on the bottom 26 of the excavation surface 2 as shown in FIG. 13 (b). The bottom plate 43 is formed by casting. Then, a plurality of stages of beams 41 are installed in the retaining wall 17 in the water 11.

  FIG. 13C is a diagram illustrating a process of constructing the RC housing 45, and FIG. 13D is a diagram illustrating a state in which the construction of the housing is completed. After the installation of the cutting beam 41, as shown in FIG. 13 (c), the water 11 in the excavation surface 2 is drained, and the RC frame 45 is constructed on the bottom slab 43. With the construction of the RC housing 45, as shown in FIG. 13 (d), the beam 41 is removed, the ground 1a in the excavation surface 2 is backfilled, and finally the earth retaining wall 17 is removed and the housing is removed. Complete the construction.

  The preferred embodiments of the ground excavation method according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  In the first to fifth embodiments, the case where the earth retaining wall using H steel as the core material has been described. However, in the ground excavation method of the present invention, a steel sheet pile, a steel pipe sheet pile, an RC connection wall, etc. It is also possible to use retaining walls formed by other ordinary retaining methods using

Vertical sectional view of the retaining wall 17 installed on the ground 1 Vertical sectional view of retaining wall 17 with water 11 inside Vertical sectional view of the retaining wall 17 in a state where the excavation inside has been completed A perspective view of a part of the retaining wall 17 in a state where the excavation inside has been completed The figure which shows each process for constructing a frame in the earth retaining wall 17 The figure which shows each process which forms the earth retaining wall 17 and excavates the inside of the excavation surface 2 The figure which shows each process which forms the earth retaining wall 17 and excavates the inside of the excavation surface 2 The figure which shows each process which forms the earth retaining wall 17 and excavates the inside of the excavation surface 2 The figure which shows each process which forms the earth retaining wall 17 and excavates the inside of the excavation surface 2 A perspective view of a part of another earth retaining wall 17a A perspective view of a part of another earth retaining wall 17b The figure which shows each process for constructing a frame in earth retaining wall 17 by other methods The figure which shows each process for constructing a frame in earth retaining wall 17 by other methods

Explanation of symbols

1, 1a ......... Ground 2 ......... Excavation surface 3 ......... Core material 5 ...... Steel 6 ...... Soil mortar 7 ...... Upset 9 ...... Anchor 11 ......... Water 13, 13a ……… Water surface 15 ……… Surface 17, 17a, 17b, 17c, 17d, 17e ……… Dodge wall 25 ……… Reserved structure 31 ……… Stile beam

Claims (9)

A step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the circumference of the ground excavation surface, and water up to a position higher than the ground surface in the excavation surface. A step (b), and a step (c) for excavating the excavation surface underwater while maintaining the water level.
In the step (a),
A core material in which the predetermined length of the upper part protrudes from the ground surface, a water-impervious member for maintaining water-stopping between the core materials in the ground, and a predetermined length of the upper part of the core material A ground excavation method comprising: installing a water-impervious plate material arranged in a cylindrical shape along the inside of the portion along the circumference of the excavation surface. A step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the circumference of the ground excavation surface, and water up to a position higher than the ground surface in the excavation surface. A step (b), and a step (c) for excavating the excavation surface underwater while maintaining the water level.
The step (a)
In the ground, a step (d) of installing a core material and a water-impervious member for keeping water-stopping between the core materials along the periphery of the excavation surface;
(E) a step of adding a core material having a predetermined length to the upper end portion of the core material and installing a water-impervious plate material in a cylindrical shape along the inside of the core material having a predetermined length on the upper portion When,
A ground excavation method comprising: After step (e)
The ground excavation method according to claim 2 , further comprising a step (f) of excavating the excavation surface to a predetermined depth. Between the step (d) and the step (e),
The ground excavation method according to claim 2 , further comprising a step (g) of excavating the excavation surface to a predetermined depth. A step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the circumference of the ground excavation surface, and water up to a position higher than the ground surface in the excavation surface. A step (b), and a step (c) for excavating the excavation surface underwater while maintaining the water level.
The step (a)
A core material with a predetermined length of the upper portion protruding from the ground surface and a water shielding member for maintaining water-stopping between the core materials in the ground are installed along the periphery of the excavation surface. A step (h) to perform,
Excavating the excavation surface to a predetermined depth (i);
A step (j) of installing a water-impervious plate in a cylindrical shape along the inside of the upper portion of the core having a predetermined length;
A ground excavation method comprising: A step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the circumference of the ground excavation surface, and water up to a position higher than the ground surface in the excavation surface. A step (b), and a step (c) for excavating the excavation surface underwater while maintaining the water level.
The retaining wall is
A water-impervious plate material installed in a cylindrical shape along the outer edge of the excavation surface;
A plurality of core members installed at predetermined intervals so that the vertical direction is the member axial direction along the outer peripheral surface of the water-impervious plate material installed in the cylindrical shape,
A water-impervious member installed in the ground to maintain water-stopping between the cores;
A ground excavation method comprising: A step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the circumference of the ground excavation surface, and water up to a position higher than the ground surface in the excavation surface. A step (b), and a step (c) for excavating the excavation surface underwater while maintaining the water level.
A ground excavation method, wherein an erection is installed on an outer wall surface side of a portion of the earth retaining wall protruding from the ground surface, and an anchor is installed between the opposed erections. A step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the circumference of the ground excavation surface, and water up to a position higher than the ground surface in the excavation surface. A step (b), and a step (c) for excavating the excavation surface underwater while maintaining the water level.
A ground excavation method, wherein an erection and a holding structure are installed on an outer wall surface side of a portion of the earth retaining wall protruding from the ground surface. A step (a) of installing a retaining wall so that a predetermined length of the upper portion protrudes from the ground surface along the circumference of the ground excavation surface, and water up to a position higher than the ground surface in the excavation surface. A step (b), and a step (c) for excavating the excavation surface underwater while maintaining the water level.
A ground excavation method, wherein stile beams are installed on an outer wall surface side of a portion of the earth retaining wall protruding from the ground surface.

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