JP2017110382A - Earth retaining wall support unit, earth retaining structure and construction method for the same - Google Patents

Abstract

[Problem] To provide an earth retaining support unit that can reliably support an earth retaining wall and can be easily constructed. [Solution] An earth retaining support unit 53 is for fixing a strut 62 erected on an earth retaining wall. This earth retaining support unit 53 is a truss structure including a vertical member 71 extending vertically, a horizontal member 70 joined to the vertical member 71 and extending horizontally, and a diagonal beam 72 connecting the horizontal member 70 and the vertical member 71. Even if a horizontal force acts on the earth retaining support unit 53 via the strut 62, it can resist this horizontal force and reliably support the earth retaining wall. In addition, since this earth retaining support unit 53 is modularized, no assembly work is required at the excavation site, construction is easy, and an earth retaining wall can be constructed in a short construction period. [Selected Figure] Figure 2

Description

  The present invention relates to a mountain retaining unit used for supporting a mountain retaining wall, a mountain retaining structure using the mountain retaining unit, and a construction method thereof.

Conventionally, a mountain retaining support for supporting a mountain retaining wall has been proposed (see Patent Documents 1 and 2).
The mountain retaining support of Patent Document 1 supports mountain retaining walls having different heights. Specifically, a plurality of retaining piles are driven into the floor surface of the excavation space at a position facing the high retaining wall, and the high retaining wall and the retaining pile are connected by a beam material. In Patent Document 1, when a horizontal force is applied to the connecting member, a horizontal shearing force and a rotational moment are applied to the retaining pile. Therefore, there is a case where the retaining force alone cannot resist the horizontal force.

  In addition, the beam material that supports the mountain retaining wall is supported by a portal ramen structure in which the first stake pile and the second stake pile are connected by a beam. Therefore, in order to form the portal ramen structure, it is necessary to drive the first retaining pile and the second retaining pile at a certain interval, and the portal ramen structure is enlarged.

  The mountain retaining support of Patent Document 2 includes a building, a pile that supports the building, and a mountain retaining wall that is built around the building. The mountain retaining wall and the building are joined by an anchor member, and at least a portion below the foundation beam or mat slab of the steel member constituting the mountain retaining wall has a permanent structure. Therefore, in Patent Document 2, there is a problem of how to support the mountain wall during the period until the building is constructed.

  If there is a difference in excavation depth and a ground anchor cannot be installed in the ground behind the retaining wall, it is necessary to construct a beam between the opposing retaining walls over a long span. was there. For this reason, a large number of shelf piles and beam members are used, and the support work becomes large or complicated.

JP2012-162848 Japanese Patent No. 4621546

  An object of the present invention is to provide a mountain retaining unit that can reliably support a mountain retaining wall and can be easily constructed. Also, by using a mountain support unit, it is possible to lay a cut beam horizontally between opposing mountain walls, such as when the interval between opposing mountain walls is long, or when the excavation depth is different on the left and right. It is an object of the present invention to provide a mountain retaining unit, a mountain retaining structure, and a construction method thereof that can reliably support a mountain retaining wall even if it is difficult.

  The mountain retaining unit of the first invention (for example, a mountain retaining unit 53 described later) is a cut beam (for example, a beam 62 described later) installed on a mountain retaining wall (for example, a mountain retaining wall 31 described later). A vertical support member (for example, a vertical member 71 described later) that extends in the vertical direction and a horizontal member (for example, a horizontal member that is described later) that is joined to the vertical member and extends in the horizontal direction. 70) and an oblique member (for example, an oblique beam 72 to be described later) connecting the horizontal member and the vertical member.

  According to the first invention, the truss structure mountain retaining unit is formed using the horizontal material, the vertical material, and the diagonal material. Therefore, it is possible to ensure excellent shear resistance performance while downsizing the mountain retaining unit. As a result, even if a horizontal force acts on the mountain support unit via the beam, the mountain wall can be reliably supported by resisting the horizontal force. In addition, since the mountain support unit is unitized, assembly work at the excavation site is not required, construction can be performed easily, and a mountain wall can be constructed in a short construction period.

  A mountain retaining structure (for example, a mountain retaining structure 1 described later) of the second invention is a structure of a mountain retaining provided in a drilling space (for example, a first drilling space 10 described later) having a predetermined depth, and is an outer periphery of the excavation space. A mountain retaining wall (for example, a mountain retaining wall 31 to be described later) constructed on a wall surface (for example, a wall surface 21 to be described later) and a receiving pile (for example, a bottom wall 12 to be described later) driven into the bottom surface (for example, a bottom surface 12 to be described later) A receiving pile 52) described later, a pile support unit (for example, a pile support unit 53 described later) provided on the bottom surface of the excavation space and connected to the receiving pile, and the excavation A cut beam (for example, a cut beam 62 which will be described later) provided between a mountain retaining wall of the space and the mountain support unit is provided.

  According to the second aspect of the invention, the mountain support unit is fixed on the bottom surface of the excavation space by the receiving pile, and the cut beam is installed between the mountain retention wall of the excavation space and the mountain support unit. As a result, it is not necessary to construct a beam between the opposing mountain retaining walls over a long span, and the retaining wall can be supported with a small number of members without increasing the size and complexity of the support work. it can.

  A mountain retaining structure (for example, a mountain retaining structure 1 described later) according to a third aspect of the invention includes a first excavation space (for example, a first excavation space 10 described later) having a predetermined depth, and the first excavation space and the first excavation space. A structure of a mountain retaining provided in a second excavation space (for example, a second excavation space 20 described later) deeper than one excavation space, and an outer peripheral wall surface (for example, a wall surface 21 described later) of the second excavation space A built-up mountain retaining wall (for example, a mountain retaining wall 31 described later), and a receiving pile (for example, a receiving pile 52 described later) driven into a bottom surface (for example, a bottom surface 12 described later) of the first excavation space, The above-described mountain support unit (for example, a mountain support unit 53 described later) provided on the bottom surface of the first excavation space and connected to the receiving pile, the mountain wall of the second excavation space, and the receiver Cut beams (e.g., rear) between piles or the mountain retaining unit And Setsuhari 62) of, characterized in that it comprises.

  Specifically, a beam may be installed between the retaining wall of the second excavation space and the retaining support unit, and the receiving support pile may be connected and integrated with the retaining support unit. Cut beams may be installed between the retaining wall of the excavation space and the receiving pile, and the retaining support unit may be connected to and integrated with the receiving pile.

According to the third invention, the mountain support unit is connected to the receiving pile, and the cut beam is connected between the mountain retaining wall of the second excavation space and the receiving pile or the mountain support unit connected to the receiving pile. It was erected. As a result, the horizontal section of the receiving pile driven into the ground surface shears against the horizontal force acting on the beam, and the horizontal ground reaction force (friction) generated between the pile support unit and the ground surface. Force). Furthermore, the ground deformation reaction force in the vertical direction can be resisted against the rotational deformation of the mountain support unit. Therefore, the mountain retaining wall constructed on the wall surface of the second excavation space having a deep excavation depth can be reliably supported.
In addition, by providing a mountain retaining unit, it is no longer necessary to resist the horizontal force acting on the beam by the receiving pile alone, so the pile diameter of the receiving pile can be reduced and the number of receiving piles can be reduced. .

  In addition, the end of the beam located on the opposite side of the retaining wall is directly supported by the receiving pile and the retaining support unit connected to the receiving pile, so that the horizontal force acting on the cutting beam On the other hand, it can resist strongly with a receiving pile and a mountain retaining unit.

In addition, if ground anchor construction is impossible as site conditions and the distance between the retaining walls facing each other is long, an attempt is made to construct a beam support between these retaining walls. There is a problem that the length becomes longer and the construction period becomes longer, and the number of shelf piles and the number of support works increase, which increases costs.
Moreover, even if the excavation depth is different between the two excavation spaces, if a cut beam is installed across these two excavation spaces, the beam will remain until the underground frame is constructed in the deeper excavation space. Cannot be dismantled, and there is a problem that the underground structure cannot be constructed in the shallow excavation space.

Therefore, according to the present invention, even if the distance between the retaining walls facing each other is long, a beam is not installed between these retaining walls, but on the bottom of the shallow excavation space. A receiving pile and a retaining ring unit were provided, and a cut beam was installed between the receiving pile and the retaining ring unit and the retaining wall of the deeper excavation space. Therefore, since the length of the beam can be shortened without increasing the size or complexity of the support work, the construction period can be shortened and the cost can be reduced.
In addition, a beam can be installed independently for each of the two excavation spaces with different excavation depths, so there is no need to dismantle the beam installed in the deeper excavation space. Can be constructed and the degree of freedom in the construction process can be improved.

  The mountain retaining structure according to a fourth aspect of the present invention is characterized in that the mountain support unit is provided on the bottom surface of the first excavation space disposed to face the mountain retaining wall of the second excavation space.

  According to the fourth aspect of the present invention, since the hill support unit is provided on the bottom surface of the first excavation space disposed opposite to the hill wall of the second excavation space, the horizontal force is applied to the mountain support unit via the beam. Even if it acts, it can resist reliably to this horizontal force.

  In the mountain retaining structure of the present invention, the mountain support units may be provided in a pair, and the pair of mountain support units may be connected to the receiving pile via a connecting material.

  According to this configuration, since the mountain support units are provided in a pair and the pair of mountain support units are connected to the receiving pile, the receiving pile and the plurality of mountain supports are supported against the horizontal force acting on the beam. Since the unit can resist shearing, the mountain retaining wall can be firmly supported.

  In the mountain retaining structure of the present invention, the mountain support unit (for example, a mountain support unit 53B described later) is a precast concrete block structure, and the mountain support unit has an insertion hole (for example, through which the receiving pile is inserted). An insertion hole 80, which will be described later, is formed, and a concave portion (for example, a concave portion 82, which will be described later) into which the cut beam is fitted may be formed on one side surface of the mountain retaining unit.

According to this configuration, the mountain retaining unit is a precast concrete block structure and is relatively heavy, and can increase the horizontal ground reaction force (frictional force) generated between the mountain retaining unit and the ground surface. This is possible and can reliably resist the horizontal force acting on the mountain support unit via the beam.
Also, after pasting a non-adhesive material such as a vinyl sheet on the inner wall surface of the insertion hole, insert the pile head of the receiving pile into the insertion hole, and in this state, fill the insertion hole with concrete or mortar filler. May be filled. In this way, since the filler is not integrated with the precast concrete block body, the mountain support unit can be easily moved when the mountain support unit is disassembled.

  According to a sixth aspect of the present invention, there is provided a retaining structure provided in a first excavation space having a predetermined depth and a second excavation space that is continuous with the first excavation space and deeper than the first excavation space. A method of constructing a mountain retaining wall from a ground surface (for example, a ground surface 2 described later) to a portion that becomes an outer peripheral wall surface of the second excavation space (for example, step S1 described later), and a ground surface A step of driving a receiving pile into the bottom portion of the first excavation space (for example, step S2 described later), and a step of excavating the first excavation space and the second excavation space to a predetermined depth (for example, described later) Step S3), a step of installing the above-mentioned mountain retaining unit on the bottom surface of the first excavation space, and connecting the mountain retaining unit to the receiving pile (for example, Step S4 described later), and the mountain Retaining wall and the receiving pile or the mountain The step of bridging the Setsuhari between the support unit (e.g., step S5 will be described later), characterized in that it comprises a a.

  According to the sixth invention, there is no need to support the opposing mountain retaining walls with the same beam over the long span, and the mountain retaining walls along the respective wall surfaces of the first excavation space and the second excavation space. Since walls can be provided, the underground structure can be constructed efficiently at low cost.

  ADVANTAGE OF THE INVENTION According to this invention, the mountain retaining unit which can support a mountain retaining wall reliably and can be constructed easily can be provided. In addition, instead of constructing a beam over a long span between opposing retaining walls, a retaining support unit with a simple structure and excellent earthquake resistance is provided on the bottom of the shallow excavation space. Thus, it is possible to provide a mountain retaining structure that can reliably support a mountain retaining wall and a construction method thereof even in excavation spaces having different excavation depths.

It is a side view of the mountain retaining structure which concerns on 1st Embodiment of this invention. It is a side view of the support frame of the mountain retaining structure which concerns on 1st Embodiment. It is a top view of the support frame which concerns on 1st Embodiment. It is a perspective view of the mountain retaining support unit of the support frame which concerns on 1st Embodiment. It is a flowchart of the construction method of the mountain retaining structure of this invention. It is explanatory drawing (the 1-3) of the procedure which builds the mountain retaining structure which concerns on 1st Embodiment. It is a side view of the support frame which concerns on 2nd Embodiment of this invention. It is a top view of the support frame which concerns on 2nd Embodiment. It is a side view of the support frame which concerns on 3rd Embodiment of this invention. It is a perspective view of the support frame which concerns on 3rd Embodiment.

The inventors of the present invention aimed at a construction site having a level difference in excavation depth and a construction site having a uniform excavation bottom without level difference in excavation depth. As a retaining structure in the case where it is not possible to place a pile, a receiving pile is driven into the floor surface of the shallow excavation space or the ground in the site, and a mountain retaining unit is provided in the vicinity of the receiving pile to provide a deep excavation space. Led to the invention of a retaining structure in which a cutting beam was erected between the retaining wall and the receiving pile or retaining unit. In other words, when constructing a new building in the excavation space surrounded by the mountain wall, if the bottom height position of the new building is different, build a step excavation space where the shallow excavation space and the deep excavation space are adjacent. Therefore, the present invention is a mountain retaining wall structure provided in the step moat space. The feature of the present invention is that it is possible to support each mountain retaining wall without installing a long span beam between opposing mountain retaining walls, and the inclination of the mountain retaining wall to the excavation region side, or This is a point to prevent the protrusion.
Specifically, in a construction site where the excavation depth has a height difference, as a configuration of the mountain support unit and the receiving pile provided on the bottom surface of the shallow excavation space, in the first embodiment, the mountain support unit is horizontal. It is the truss structure comprised with the material, the vertical material, and the diagonal beam, and a pair of mountain retaining unit is connected with a pair of receiving pile. Moreover, in 2nd Embodiment, one mountain retaining support unit of the structure of 1st Embodiment is connected with one receiving pile. Moreover, in 3rd Embodiment, the pile support unit is made into the precast concrete block body, and the receiving pile is inserted in the insertion hole.
In addition, in a construction site having a uniform excavation bottom with no difference in excavation depth, as the retaining structure of the fourth embodiment, there is no deep excavation space, and the mountain support unit is fixed to the bottom of the excavation space of a predetermined depth. In addition, a beam is installed between the mountain retaining wall and the mountain retaining unit.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
[First Embodiment]
FIG. 1 is a side view of a mountain retaining structure 1 according to a first embodiment of the present invention.
The mountain retaining structure 1 is provided in a first excavation space 10 having a predetermined depth and a substantially rectangular parallelepiped second excavation space 20 that is continuous with the first excavation space 10 and deeper than the first excavation space. is there.

The first excavation space 10 is a substantially rectangular parallelepiped space. Hereinafter, the outer peripheral wall surface of the first excavation space 10 is referred to as a wall surface 11, and the bottom surface (floored surface) of the first excavation space 10 is referred to as a bottom surface 12.
Here, the depth from the ground surface 2 to the bottom surface 12 of the first excavation space 10 has a d _1.

The second excavation space 20 is a substantially rectangular parallelepiped space. Hereinafter, the outer peripheral wall surface of the second excavation space 20 is referred to as a wall surface 21, the wall surface between the first excavation space 10 and the second excavation space 20 is referred to as a wall surface 22, and the bottom surface (floored surface) of the second excavation space 20 is the bottom surface. 23.
Here, the depth from the ground surface 2 to the bottom surface 23 of the second excavation space 20 is d ₂ which is larger than d ₁ .

  The mountain retaining structure 1 includes mountain retaining walls 30, 31, 32 constructed on the wall surfaces 11, 21, 22 of the excavation spaces 10, 20, a support frame 50 and a retaining pile 51 provided on the bottom surface 12 of the first excavation space 10. And the ridges 40, 41, 42 provided on the mountain retaining walls 30-32 and the support frame 50 in three upper and lower stages, and the cut beam 60 provided between the lower and middle erections 40, 41. , 61, and a cut beam 62 erected between the upper bulges 42 on the upper stage, and an oblique cut beam 63 erected between the erection 42 and the retaining pile 51.

Specifically, a mountain retaining wall 30 is constructed on the wall surface 11 of the first excavation space 10, and a bulge 42 extending substantially horizontally is provided on the inner wall surface of the mountain retaining wall 30. .
In addition, a mountain retaining wall 31 is constructed on the wall surface 21 of the second excavation space 20, and the inner wall surface of the mountain retaining wall 31 is provided with bulges 40 to 42 extending substantially horizontally.
Further, a mountain retaining wall 32 is constructed on the wall surface 22 of the second excavation space 20, and abdominal erections 40 and 41 are provided on the mountain retaining wall 32.

The lower beam 60 is constructed between the ridge 40 of the mountain retaining wall 31 and the ridge 40 of the mountain retaining wall 32. The middle beam 61 is constructed between the ridge 41 of the mountain retaining wall 31 and the ridge 41 of the mountain retaining wall 32. The upper cut beam 62 is installed between the flank 42 of the mountain retaining wall 31 and the flank 42 of the support frame 50.
The oblique beam 63 is constructed between the flank 42 of the mountain retaining wall 32 and the retaining pile 51.

2 and 3 are a side view and a plan view of the support frame 50.
The support frame 50 includes a pair of receiving piles 52 that are driven into the bottom surface 12 of the first excavation space 10 disposed opposite to the mountain retaining wall 31 and a pair of mountain supporting supports installed inside the pair of receiving piles 52. A unit 53; and a connecting member 54 that connects the pair of receiving piles 52 and the pair of mountain retaining units 53.

  The hill support unit 53 is provided on the bottom surface 12 of the first excavation space 10 and extends in the horizontal direction, and is erected on one end side (here, the hill wall 31 side) of the horizontal material 70 so as to be vertical. It is a truss structure including a vertical member 71 extending in the direction, and an oblique beam 72 as an oblique member that connects the other end side of the horizontal member 70 and the upper end side of the vertical member 71.

Discarded concrete 73 is cast on the bottom surface 12 of the first excavation space 10, and the horizontal member 70 is installed on the discarded concrete 73. Accordingly, the mountain support unit 53 is provided on the bottom surface 12 of the first excavation space 10 disposed to face the mountain retaining wall 31 of the second excavation space 20.
On the bottom surface 12 of the first excavation space 10, a front connecting member 74 is provided between the lower end portion of the vertical member 71 and the mountain retaining wall 32, and the vertical member 71 is interposed via the front connecting member 74. Are connected to the mountain retaining wall 32.

The connecting member 54 is joined to the upper surface of the horizontal member 70 of the mountain support unit 53, whereby the mountain support unit 53 is connected to the receiving pile 52.
Further, the erection 40 is provided on the upper end side of the vertical member 71, so that the cut beam 62 is constructed between the mountain retaining wall 31 and the mountain retaining unit 53.

  In addition, as shown in FIG. 4, the through hole 75 which penetrates up and down is provided in the horizontal material 70 of the mountain retaining unit 53, and the receiving pile 52 is inserted in this through hole 75, so that the mountain retaining unit directly. 53 may be connected to the receiving pile 52. At this time, by increasing the opening area of the through-hole 75, it is possible to cope with receiving piles of various sizes.

According to the support frame 50 described above, as shown in FIG. 2, the shear resistance P ₁ by the receiving pile 52 driven into the bottom surface 12 of the first excavation space 10 with respect to the horizontal force P acting on the cut beam 62, a horizontal ground reaction force (frictional force) P ₂ relative to the bottom surface 12 of the first excavation space 10 YamaTome support unit 53, and the ground reaction force Pv in the vertical direction, in resisting. Further, when a horizontal force P acts on the cut beam 62, a rotational moment M is generated in the receiving pile, and the truss structure mountain retaining unit 53 resists this rotational moment M.

The construction method of the above retaining structure 1 will be described with reference to the flowchart of FIG. 5 and the explanatory diagrams of the excavation procedures of FIGS.
In step S1, as shown in FIG. 6 (a), the mountain retaining walls 30 to 32 are constructed from the ground surface 2 to the wall surfaces 11, 21, and 22 of the excavation spaces 10 and 20 before the excavation. To do.
In step S <b> 2, as shown in FIG. 6A, the reserve pile 51 and the receiving pile 52 are driven from the ground surface 2 into the portion that becomes the bottom surface 12 of the first excavation space 10.

In step S3, as shown in FIG. 6 (b), drilling a first excavation space 10 and the second drilling space 20 to a depth _{d 1.} That is, the second excavation space 20 is first excavated to the depth d ₁ of the first excavation space 10. As a result, the bottom surface 12 of the first excavation space 10 is exposed.

In step S <b> 4, as shown in FIG. 6B, the mountain support unit 53 is installed on the bottom surface 12 of the first excavation space 10, and this mountain support unit 53 is connected to the receiving pile 52. In addition, the mountain retaining unit 53 is connected to the mountain retaining wall 32 via the front connecting member 74.
In step S5, the upright wall 42 is attached to the mountain retaining walls 30, 31 and the mountain retaining support unit 53, and the beam 62 is installed between the mountain retaining wall 31 and the mountain retaining support unit 53, and the mountain retaining wall. An oblique beam 63 is installed between 30 and the stake 51.

In step S6, as shown in FIG. 6 (c), the second excavation space 20 is set to the depth d ₂ while the ridges 40, 41 are attached to the mountain retaining walls 31, 32 and the beams 60, 61 are installed. Drill until. Then, it will be in the state of FIG.

According to this embodiment, there are the following effects.
(1) With respect to the horizontal force acting on the cut beam 62, the shear resistance by the receiving pile 52 driven into the ground surface, the horizontal friction force generated between the mountain retaining unit 53 and the ground surface, and the vertical direction Because it resists with the ground reaction force, it can support the mountain retaining wall reliably. Moreover, by providing the mountain retaining unit 53 instead of the receiving pile 52 alone, the pile diameter of the receiving pile 52 can be reduced, or the number of the receiving piles 52 can be reduced.

(2) Even if the distance between the retaining walls 30 and 31 facing each other is long, a beam is not installed between the retaining walls 30 and 31, but on the bottom surface 12 of the first excavation space 10. Since the receiving pile 52 and the mountain retaining unit 53 are provided and the beam 62 is installed between the receiving pile 52 or the mountain retaining unit 53 and the mountain retaining wall 31, the length of the beam 62 can be shortened. As well as cost.
Moreover, since the cut beams 60 to 63 can be independently constructed for each of the two excavation spaces 10 and 20 having different excavation depths, the cut beams 60 to 62 constructed in the second excavation space 20 having a deep excavation depth are provided. Even if it is not dismantled, it is possible to construct the underground structure of the first excavation space 10 with a shallow excavation depth, and to improve the degree of freedom of the construction process.

  (3) Since the truss structure mountain retaining unit 53 is configured by using the horizontal member 70, the vertical member 71, and the oblique beam 72, a simple structure and excellent shear resistance performance can be secured. Even if a horizontal force acts on the mountain support unit 53, the horizontal force can be resisted.

  (4) The mountain retaining unit 53 is connected to the mountain retaining wall 32 via the front connecting member 74 and supported on the bottom surface 12 of the first excavation space 10 via the receiving pile 52. The wall 31 can be firmly supported.

[Second Embodiment]
7 and 8 are a side view and a plan view of a support frame 50A according to the second embodiment of the present invention.
In the present embodiment, the supporting frame 50 </ b> A is provided with one receiving pile 52 driven into the bottom surface 12 of the first excavation space 10, and 1 provided along the receiving pile 52 on the opposite side of the mountain retaining wall 30. Two mountain-holding support units 53.
In the support frame 50 </ b> A, the erection 40 is provided on the upper end side of the receiving pile 52. Thereby, the cut beam 62 is constructed between the mountain retaining wall 31 and the receiving pile 52.

According to this embodiment, in addition to the effects (1) to (4) described above, the following effects can be obtained.
(5) Since the support frame 50 formed by the pair of receiving piles 52 and the pair of mountain retaining units 53 with respect to one cut beam 62 is configured with a small number of members, the mountain wall construction stage Or, in the dismantling stage, it is possible to realize a short construction period and a low cost. The support frame 50 can be installed even if the installation space is narrow.

[Third Embodiment]
9 and 10 are a side view and a perspective view of a support frame 50B according to the third embodiment of the present invention.
The support frame 50 </ b> B includes a single receiving pile 52 driven into the bottom surface 12 of the first excavation space 10, and a cylindrical mountain support unit 53 </ b> B through which the receiving pile 52 is inserted.
The mountain retaining unit 53B has a rectangular column shape made of reinforced concrete, and has an insertion hole 80 extending vertically. The receiving pile 52 is inserted into the insertion hole 80, and the concrete is filled in the insertion hole 80 in this state.

  Moreover, the recessed part 82 is formed in the side surface of the mountain support unit 53B. The support frame 50B is not provided with an erection, and the cut beam 62 is directly fitted into the recess 82. Thereby, the cut beam 62 is constructed between the mountain retaining wall 30 and the mountain retaining unit 53B.

According to this embodiment, in addition to the effects (1) to (4) described above, the following effects can be obtained.
(6) Since the mountain retaining unit 53B is made of a precast concrete block, the mountain retaining unit 53B can be easily formed in various shapes and is relatively heavy so that it has a friction with the ground surface. A large resistance force can be secured, and the horizontal force acting on the mountain support unit 53B via the cut beam 62 can be reliably resisted.

[Fourth Embodiment]
The side view of the mountain retaining structure 1 according to the fourth embodiment of the present invention corresponds to the explanatory diagram (No. 2) of the construction procedure of the mountain retaining structure of the first embodiment shown in FIG. Specifically, the mountain retaining wall 32 shown in FIG. 6B is not installed, and the excavation space is uniform with no height difference. The mountain retaining structure of the present embodiment is composed of a mountain retaining unit 53, a receiving pile 52, and a cut beam 62, and has substantially the same configuration as that of the first embodiment, but the first embodiment shown in FIG. 6 (b). The wall surfaces 21 and 22, the bottom surface 23, and the beams 60 and 61 are not provided.

According to this embodiment, in addition to the effects (1) to (4) described above, the following effects can be obtained.
(7) Even if the height of the outer peripheral wall of the excavation space varies depending on the location, the mountain support unit 53 is fixed to the excavation bottom surface 12 and the beam between the mountain retention wall and the mountain support unit 53 having different heights is fixed. 62 can be supported. Therefore, the cut beams 62 can be installed by using the same kind of mountain retaining unit 53 even if the mountain retaining walls have different heights.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in the above-described first embodiment, the receiving piles 52 are provided in a pair, and the pair of mountain support units 53 are disposed inside the pair of receiving piles 52. A pair of mountain retaining units 53 may be disposed with the receiving pile interposed therebetween.

  In the first and second embodiments, when the stepped excavation space is constructed in the excavation spaces 10 and 20 surrounded by the mountain retaining walls 30 to 32, the bottom surface of the first excavation space 10 having the shallower excavation depth. Although the receiving pile 52 and the mountain retaining unit 53 are provided in 12 and the mountain retaining wall 31 with the deeper excavation depth is supported via the cut beam 62, it is not limited thereto. For example, in the present invention, there is a height difference in the construction site, and a receiving pile and a mountain support unit are provided on the back ground of the mountain wall with the lower height position of the mountain retaining wall and facing each other. You may support a mountain wall.

DESCRIPTION OF SYMBOLS 1 ... Mountain retaining structure 2 ... Ground surface 10 ... 1st excavation space 11 ... Wall surface 12 ... Bottom surface 20 ... 2nd excavation space 21, 22 ... Wall surface 23 ... Bottom surface 30, 31, 32 ... Mountain retaining wall 40, 41, 42 ... Belly Raising 50, 50A, 50B ... Supporting frame 51 ... Reserved pile 52 ... Receiving pile 53, 53B ... Yamadome support unit 54 ... Connecting material 60, 61, 62 ... Cut beam 63 ... Diagonal cut beam 70 ... Horizontal material 71 ... Vertical Material 72 ... Oblique beam (oblique material) 73 ... Discarded concrete 74 ... Front joint material 75 ... Through hole 80 ... Insertion hole 81 ... Concrete (filler) 82 ... Recess

Claims (5)

A mountain support unit for fixing a beam constructed on a mountain wall,
A mountain having a truss structure including a vertical member extending in the vertical direction, a horizontal member joined to the vertical member and extending in the horizontal direction, and an oblique member connecting the horizontal member and the vertical member. Tome support unit. It is a structure of a mountain stop provided in an excavation space of a predetermined depth,
A mountain wall constructed on the outer peripheral wall surface of the excavation space;
A receiving pile driven into the bottom of the excavation space;
The hill support unit according to claim 1 provided on the bottom surface of the excavation space and connected to the receiving pile.
A mountain retaining structure comprising: a retaining wall in the excavation space; and a cutting beam constructed between the retaining wall support unit. A mountain retaining structure provided in a first excavation space having a predetermined depth and a second excavation space that is continuous with the first excavation space and deeper than the first excavation space,
A mountain retaining wall constructed on the outer peripheral wall surface of the second excavation space;
A receiving pile driven into the bottom surface of the first excavation space;
The hill support unit according to claim 1 provided on the bottom surface of the first excavation space and connected to the receiving pile.
A mountain retaining structure comprising: a mountain retaining wall of the second excavation space and a cut beam constructed between the receiving pile or the mountain retaining unit.   4. The mountain retaining structure according to claim 3, wherein the mountain support unit is provided on a bottom surface of the first excavation space disposed to face a mountain retention wall of the second excavation space. A construction method of a retaining structure provided in a first excavation space having a predetermined depth and a second excavation space continuous to the first excavation space and deeper than the first excavation space,
A step of constructing a mountain retaining wall from the ground surface to a portion that becomes an outer peripheral wall surface of the second excavation space;
A step of driving a receiving pile from a ground surface to a portion to be a bottom surface of the first excavation space;
Excavating the first excavation space and the second excavation space to a predetermined depth;
Installing the mountain support unit according to claim 1 on the bottom surface of the first excavation space, and connecting the mountain support unit to the receiving pile;
And a step of constructing a beam between the mountain retaining wall and the receiving pile or the mountain retaining unit.

Images