JP5372289B1 - Boundary wall structure - Google Patents

Abstract

Provided is a boundary wall structure capable of easily building a high-strength boundary wall on a mountain retaining wall when the mountain retaining wall is constructed by an earth anchor method.
A boundary wall structure 1 includes a boundary wall 4 erected on a mountain retaining wall 3 formed by an earth anchor method. The boundary wall 4 includes a first wall portion 8 formed of a protruding portion 5a of each parent pile 5 of the mountain retaining wall 3 and a reinforced concrete 10 disposed therebetween, and a second wall portion 9 formed integrally with the outside. It consists of. The second wall portion 9 includes an integral portion 12 that is integral with the first wall portion 8 and an extension portion 13 that extends upward from the upper end of the first wall portion 8.
[Selection] Figure 1

Description

  The present invention relates to a boundary wall structure including a boundary wall standing on a mountain retaining wall by an earth anchor method.

  When building a retaining wall on the ground by the earth anchor method, first, a plurality of parent piles are driven along the boundary line of the ground divided by the retaining wall. Next, while digging down the inside of the boundary line, a cross sheet pile is passed between the adjacent parent piles, and the outer soil is supported. Next, when digging down to a predetermined depth, a ground anchor is provided on the ground from the inside of the lateral sheet pile. And each anchor pile supports an anchor head via the abdominal erection passed between them (for example, refer patent document 1).

  A mountain retaining wall having a main pile and a lateral sheet pile is constructed by repeating the procedure from the excavation of the ground to the support of the anchor head until the necessary excavation depth is reached. It is also considered that such a mountain retaining wall by the earth anchor method is used to create a disposal section which is a depression for landfilling and disposing of waste at a final disposal site for waste.

JP 2007-177517 A

  However, in the final disposal site for waste, it is necessary to construct a boundary wall for preventing intrusion into the disposal section from the outside around the mountain retaining wall that defines the disposal section. Such a boundary wall may be filled with waste when the disposal section is filled with waste. In some cases, the inside of the boundary wall is filled and used as a road. In such a case, the boundary wall needs to serve as a strong retaining wall.

  For constructing such a strong boundary wall, a conventional L-shaped retaining wall may be used. However, according to the L-shaped retaining wall, the L-shaped retaining wall is installed on the boundary of the disposal area or the installation state is safe unless the inside of the boundary is filled with waste or embankment to the ground level. Difficult to maintain. Alternatively, in order to avoid such inconvenience, it is necessary to install an L-shaped retaining wall some distance away from the boundary.

  An object of the present invention is to provide a boundary wall structure that can easily construct a high-strength boundary wall on a mountain retaining wall when constructing the mountain retaining wall by an earth anchor method in view of the problems of the prior art. It is in.

  The boundary wall structure of the present invention is a boundary wall structure including a boundary wall erected on a mountain retaining wall by an earth anchor method, and the mountain retaining wall has a protruding portion protruding above the ground. A plurality of parent piles, wherein the boundary wall includes a first wall portion formed between the protruding portions of the adjacent parent piles and the protruding portions, and the reinforced concrete of the first wall portion. And a second wall portion formed on the outside of the first wall portion, and the second wall portion is integrated with the first wall portion along the first wall portion. And an extension portion extending upward from the upper end of the first wall portion.

  In the present invention, the pile pile of the retaining wall forming the first wall portion is firmly fixed to the ground by the earth anchor and has high strength. Therefore, the 1st wall part formed by arrange | positioning a reinforced concrete between parent piles, and the 2nd wall part comprised by the reinforced concrete integral with this reinforced concrete also have high intensity | strength.

  For this reason, the boundary wall formed by the first wall portion and the second wall portion is fixed to the ground with high strength via the parent pile of the mountain retaining wall. Therefore, it is not necessary to separately provide a strong foundation for firmly fixing the boundary wall to the ground.

  Moreover, since a boundary wall is constructed | assembled using the protrusion part of a main pile, if it is after driving a main pile, it can be constructed in parallel with the construction of a mountain retaining wall. Therefore, according to the present invention, when constructing a retaining wall by the earth anchor method, a boundary wall having high strength can be easily constructed on the retaining wall.

  In the present invention, the first wall portion has a lower end portion existing in a range from the ground to a predetermined depth, and the lower end portion is a portion corresponding to the existence range of the lower end portions in the plurality of parent piles. The reinforced concrete disposed as an integral part of the reinforced concrete between the projecting portions between the adjacent corresponding portions, the second wall portion existing in a range from the ground to a predetermined depth, and The horizontal base has a horizontal base projecting outward in the horizontal direction from the outer wall surface in the integral part of the second wall part, and the horizontal base is formed of reinforced concrete at the lower end and reinforced concrete integral with the reinforced concrete at the integral part. May be.

  According to this, the boundary wall is made stronger by the lower end portion of the first wall portion and the horizontal base portion of the second wall portion while easily constructing a high-strength boundary wall on the mountain retaining wall. Can do. In addition, the base end and the horizontal base can prevent rainwater and the like from entering the inside of the boundary wall to some extent.

  In the present invention, the reinforced concrete constituting the first wall portion and the second wall portion extends along the inner wall surface of the first wall portion, and is bent at the upper end portion of the first wall portion. A plurality of vertical bars extending along the outer wall surface of the extension part of the second wall part, wherein the reinforced concrete of the first wall part is a first horizontal bar passed between upper ends of the adjacent parent piles; And a second horizontal bar extending above the first horizontal bar, and the reinforced concrete of the second wall portion includes a third horizontal bar arranged at the same height as the first horizontal bar, and the second horizontal bar. 4th horizontal stripe arrange | positioned at the same height, The said 1st-4th horizontal stripe may be couple | bonded by the some stirrup.

  According to this, the reinforced concrete which comprises a 1st wall part, and the reinforced concrete which comprises a 2nd wall part are integrated firmly by said vertical reinforcement, 1st-4th horizontal reinforcement, and a stirrup. Thereby, the boundary wall can be further strengthened while the boundary wall having high strength is easily constructed on the mountain retaining wall.

  Further, in the present invention, the mountain retaining wall, a ground anchor having a base end protruding from the mountain retaining wall and an anchor head fixed to the base end, and the anchor head are provided to the tendon. An anchor pedestal that supports the mountain retaining wall against the tension force applied, and a container-like form in which the mountain retaining wall side is opened, and covers a space including the anchor head and the anchor pedestal. An anchor cover; and a waterproof coating layer that integrally covers the inner wall of the mountain retaining wall and the boundary wall including the anchor cover, wherein the waterproof coating layer includes the mountain retaining wall and the boundary wall. A wall surface covering portion that covers the anchor cover along its wall surface and a cover covering portion that covers the anchor cover along its outer surface may be integrated.

  According to this, waterproofing of the surrounding ground can be achieved over the entire mountain wall and the boundary wall by the waterproof coating layer while easily building a high-strength boundary wall on the mountain wall.

  At that time, the anchor head and the anchor pedestal are covered with the anchor cover and covered with the cover covering portion along the outer surface of the anchor cover, so that the inside of the mountain retaining wall is buried with waste, and the pressure from the waste is waterproofed. Even when applied to the layer, the waterproof function of the waterproof coating layer can be maintained without causing breakage of the waterproof coating layer.

It is sectional drawing in the parent pile position of the boundary wall structure which concerns on one Embodiment of this invention. It is sectional drawing between the parent piles of the boundary wall structure of FIG. (A) is a front view which shows the structure of the mountain wall part with which the boundary wall structure of FIG. 1 is provided, (b) is BB sectional drawing of (a). It is a perspective view of the anchor cover in the mountain retaining wall part of FIG. It is a perspective view which shows a mode that the waterproof coating layer of the mountain retaining wall part of FIG. 3 was seen from the inside of a mountain retaining wall.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the boundary wall structure 1 of the embodiment includes a mountain retaining wall 3 formed on the ground 2 by an earth anchor method, and a boundary wall 4 standing on the mountain retaining wall 3. . The mountain retaining wall 3 constitutes a vertical side wall that divides a disposal section for landfilling and disposing of waste from the surrounding ground 2 in a final disposal site for waste.

  The mountain retaining wall 3 is passed between the plurality of parent piles 5 driven in the vertical direction at a certain interval in the horizontal direction with respect to the ground 2 and the adjacent parent piles 5 in the horizontal direction. And a plurality of horizontal sheet piles 6 supporting the above. Each parent pile 5 has a protruding portion 5a protruding above the ground GL by, for example, about 1 [m]. As the parent pile 5, H-shaped steel is used. The lateral sheet pile 6 is inserted between the inner side of the parent pile 5 and the earth and sand of the ground 2.

  The boundary wall 4 is constructed using the protruding portion 5 a of the parent pile 5. In FIG. 1, the bar arrangement situation in the position of the parent pile 5 of the boundary wall 4 is also shown. In FIG. 2, the bar arrangement between the adjacent parent piles 5 of the boundary wall 4 is also shown.

  The boundary wall 4 includes a first wall portion 8 formed using the parent pile 5 and a second wall portion 9 formed integrally with the first wall portion 8 outside the first wall portion 8. . The 1st wall part 8 is formed with the protrusion part 5a of the some parent pile 5, and the reinforced concrete 10 arrange | positioned between the adjacent protrusion parts 5a. The first wall portion 8 is, for example, about 0.6 [m] higher than the upper end 5 b of the parent pile 5.

  Moreover, the 1st wall part 8 has the lower end part 11 which exists in the range from the ground GL to the depth of about 0.45 [m], for example. The lower end part 11 is formed by the part of the parent pile 5 corresponding to the existence range and the reinforced concrete 10 disposed between the adjacent parts. The reinforced concrete 10 is integrated with the reinforced concrete 10 between the protrusions 5 a of the parent pile 5.

  The second wall portion 9 is formed outside the first wall portion 8 by the reinforced concrete 10 integrated with the reinforced concrete 10 of the first wall portion 8. The second wall portion 9 extends along the first wall portion 8 integrally with the first wall portion 8 and extends upward from the upper end level of the first wall portion 8 by about 2 [m], for example. And an extension portion 13 which is a part.

  Further, the second wall portion 9 exists in a range from the ground GL to the same depth as the lower end portion 11 of the first wall portion 8 and is more horizontal than the outer wall surface of the integral portion 12 of the second wall portion 9. For example, the horizontal base 14 is projected about 0.9 [m], for example. Accordingly, the second wall portion 9 has an L-shaped cross section. The horizontal base portion 14 is formed of the reinforced concrete 10 at the lower end portion 11 and the reinforced concrete 10 integrated with the reinforced concrete 10 at the integral portion 12.

  Two horizontal stripes 15 are passed between the upper end surfaces of the adjacent parent piles 5. In addition, two transverse lines 16 are provided approximately 0.2 [m] above the two transverse lines 15. The two horizontal bars 15 and the two horizontal bars 16 are fixed to the parent pile 5 by bending reinforcing bars 17 bent in a square shape so that their cross sections constitute four corners of a square.

  Further, lateral stripes 18 and 19 are arranged in the vicinity of the outer wall surface of the second wall portion 9 at the same height as the lateral stripes 15 and 16, respectively. These horizontal bars 15 and 16 and the horizontal bars 18 and 19 are connected between adjacent parent piles 5 by, for example, stirrups 20 provided at intervals of 250 [mm].

  Similarly, a plurality of horizontal bars 22 are passed to the part of the main pile 5 corresponding to the lower end part 11 of the first wall part 8 through two upper and lower stages of the dowel bars 21 fixed to the part. A plurality of horizontal stripes 23 are arranged on the horizontal base portion 14 of the second wall portion 9 so that their cross sections form a quadrangle.

  The plurality of horizontal stripes 23 are coupled by stirrups 24 arranged at intervals of, for example, 250 [mm]. In addition, the plurality of horizontal bars 22 and the plurality of horizontal bars 23 are connected by reinforcing stirrups 25 arranged at intervals of, for example, 250 [mm].

  Further, in the vicinity of the inner wall surface of the first wall portion 8 between the adjacent parent piles 5, the horizontal stripes 26 and the vertical stripes 27 are arranged at appropriate intervals. The vertical bars 27 are bent at the upper end of the first wall 8 and extend upward along the outer wall surface of the extension 13 of the second wall 9.

  The horizontal stripes 28 and the vertical stripes 29 are arranged at appropriate intervals on the first wall 8 side of the second wall 9. The vertical bars 29 are arranged, for example, at intervals of 150 [mm], and extend from the intermediate height of the first wall portion 8 to the upper end portion of the second wall portion 9. The horizontal stripes 30 and the vertical stripes 31 are arranged on the outer wall surface side of the second wall portion 9 at appropriate intervals.

  The vertical bars 31 are arranged, for example, at intervals of 300 [mm] and extend from the upper end of the second wall 9 over the vicinity of the bottom of the horizontal base 14, and the end on the horizontal base 14 side is the second wall 9. It is bent toward the outside. The upper end of the vertical bar 31 is connected to the upper end of the corresponding vertical bar 29 by a crooked bending bar 32.

  On the outer wall surface of the second wall portion 9, the decorative form frame 33 is applied with a thickness of about 45 [mm] from the upper end to the horizontal base portion 14.

  FIG. 3A is a front view showing the structure of the mountain wall 3 portion of the boundary wall structure 1. FIG. 3B is a cross-sectional view taken along line B-B in FIG. In addition, in FIG. 3A, illustration of a waterproof coating layer 44 described later is omitted.

  As shown in FIG. 3, the boundary wall structure 1 includes a ground anchor 34 for fixing the mountain retaining wall 3 to the ground 2. The earth anchor 34 is provided with a plurality of stages according to the height of the mountain retaining wall 3. One stage includes the number of earth anchors 34 corresponding to the horizontal length of the mountain retaining wall 3.

  Each earth anchor 34 includes a tendon 35 having a base end portion protruding from the mountain retaining wall 3 and an anchor head 36 fixed to the base end portion. The tendon 35 is made of rod-like PC steel or PC steel wire.

  In addition, the boundary wall structure 1 includes abdominal protrusions 37a and 37b that support the mountain retaining wall 3 on the upper side and a lower side of each anchor head 36, and an anchor that supports the anchor head 36 on the abdominal protrusions 37a and 37b. And a pedestal 38. The anchor base 38 supports the anchor head 36 against the tension force applied to the tendon 35 of the earth anchor 34.

  The erections 37a and 37b are arranged in parallel to the horizontal direction. Depending on the number of earth anchors 34 in the horizontal direction, the protuberances 37a and 37b are appropriately connected and extended in the horizontal direction. For example, H-shaped steel is used as the bulges 37a and 37b. The erections 37a and 37b are respectively supported by upper and lower brackets 39a and 39b provided on the parent pile 5 by welding or the like.

  The anchor pedestal 38 spans the corresponding upper and lower erections 37a and 37b, and supports the anchor head 36 on the upper and lower erections 37a and 37b. As a result, the tension applied to the earth anchor 34 presses the mountain retaining wall 3 via the anchor base 38 and the protuberances 37a and 37b, and the mountain retaining wall 3 is reliably fixed to the ground 2.

  The anchor pedestal 38 is configured by arranging two substantially pentagonal steel plates 40 parallel to each other and erected so as to be orthogonal to 37a and 37b, and connecting the two steel plates 40 with a plurality of plate members. Is done. One side of the pentagon has a length extending over the corresponding upper and lower protuberances 37a and 37b, two sides at both ends thereof extend in the horizontal direction, and the other two sides are connected to the edges of the two sides. Connect in series. The upper side of the other two sides is substantially orthogonal to the earth anchor 34.

  One of the plurality of plate members connecting the two steel plates 40 constitutes an anchor plate 41 that supports the anchor head 36. The anchor plate 41 connects sides of the two steel plates 40 that are substantially orthogonal to the earth anchor 34. Thereby, the anchor plate 41 is substantially orthogonal to the earth anchor 34, and can appropriately support the anchor head 36.

  Further, another one of the plates connecting the two steel plates 40 constitutes a convex portion 42 that determines the vertical position of the anchor base 38 by contacting the lower bulge 37b in the vertical direction. To do. The convex part 42 mutually connects the side which has the length which straddles 37a and 37b in the two steel plates 40, and extends.

  Further, the boundary wall structure 1 includes an anchor cover 43 that covers a space including the anchor head 36 and the anchor base 38, and a waterproof coating layer that integrally covers the wall surface of the mountain retaining wall 3 including the outer surface of the anchor cover 43. 44.

  FIG. 4 is a perspective view of the anchor cover 43. As shown in FIG. 4, the anchor cover 43 has a container-like shape with the mountain retaining wall 3 side open, and has a substantially rectangular parallelepiped shape. On the side walls adjacent to both sides in the horizontal direction of the surface of the opened mountain retaining wall 3, cutout portions 45 that avoid the interference with the bulges 37a and 37b at the portions that intersect the bulges 37a and 37b. Is provided.

  As shown in an enlarged view in FIG. 3 (b), the waterproof covering layer 44 includes a protective sheet 46a, a water shielding sheet 47a, a protective sheet 46b, a water shielding sheet 47b, and a urethane layer 48 from the mountain retaining wall 3 side. Constructed in order.

  FIG. 5 shows a state in which the waterproof coating layer 44 is viewed from the inside of the mountain retaining wall 3 (on the side opposite to the ground 2). As shown in FIG. 5, the waterproof covering layer 44 has a flat wall surface covering portion 49 that covers the mountain retaining wall 3 (see FIG. 3) along its wall surface, and a convex shape that covers the anchor cover 43 along its outer surface. The cover covering portion 50 and the flank covering portion 51 that covers the flank portions 37a and 37b along the shape thereof are provided.

  The flank covering portion 51 covers portions of the flank 37a and 37b that are not covered with the anchor cover 43. The wall surface covering portion 49, the cover covering portion 50, and the erection covering portion 51 are continuous without a gap. Although not illustrated in FIGS. 1 and 2, the wall surface covering portion 49 extends to the upper end of the boundary wall 4 and covers the inner wall surface of the boundary wall 4.

  The cover covering portion 50 has a rectangular parallelepiped shape along the outer surface of the anchor cover 43. The flank covering portion 51 has a shape of a ridge having a rectangular cross section in accordance with the shapes of the flares 37a and 37b.

  When constructing a concave disposal section for landfilling waste by applying the boundary wall structure 1, first, the mountain retaining wall 3 is formed by the earth anchor method on the ground 2 at the boundary portion of the disposal section.

  That is, the parent pile 5 is driven in while adjusting the driving amount so as to form the protruding portion 5a along the boundary of the disposal section at a predetermined interval. And the side sheet pile 6 is installed between each adjacent parent pile 5 while digging down the inner side of a boundary. In parallel with this, the boundary wall 4 is constructed by using the master pile 5 that has been driven in, arranging the bars as shown in FIGS. 1 and 2, providing the formwork, and pouring the concrete into the formwork. be able to.

  When the dug depth reaches a predetermined value, drilling is performed downward about 30 ° with respect to the ground 2 at an intermediate position between the adjacent parent piles 5. Then, the tendon 35 is inserted into the formed hole from the front end side, and cement milk is further pressed and solidified. Thereby, parts other than the anchor head 36 of the earth anchor 34 are formed.

  Next, the brackets 39a and 39b are welded and fixed to the parent piles 5, and the brackets 39a and 39b are erected to support the 37a and 37b, respectively. Further, the anchor pedestal 38 is disposed on each of the bulges 37 a and 37 b, the base end portion of the corresponding tendon 35 is projected from the hole of the anchor plate 41, and the anchor head 36 is attached to the tendon 35.

  Then, a tension force is applied to the tendon 35 with a tension jack, and the base end portion of the tendon 35 is fixed to the anchor head 36. Accordingly, the mountain retaining wall 3 is reliably fixed to the ground 2 by the tension force of the tendon 35 via the anchor head 36, the anchor base 38, and the erections 37a and 37b.

  Thereby, formation of the mountain retaining wall 3 corresponding to one stage of the anchor head 36 is completed. Furthermore, the mountain retaining wall 3 is formed in the same procedure according to the required depth of the disposal section, while providing the anchor heads 36 of the necessary number of steps. When the retaining wall 3 reaches the required height, the formation of the retaining wall 3 is completed.

  Next, the anchor cover 43 is put on each anchor head 36 and the anchor pedestal 38 protruding from the mountain retaining wall 3 formed around the disposal section. Further, the wall surfaces of the mountain retaining wall 3 and the boundary wall 4 are integrally covered with the waterproof covering layer 44 including the anchor covers 43 and the bulges 37a and 37b.

  At this time, the anchor cover 43 is covered with the cover covering portion 50 of the waterproof covering layer 44 along the outer surface thereof. The erections 37a and 37b are covered with the erection covering portion 51 of the waterproof coating layer 44 along the shape thereof. The portion of the mountain retaining wall 3 other than the portion where the anchor cover 43 and the erections 37a and 37b are present, and the boundary wall 4 are covered with a wall surface covering portion 49 of the waterproof covering layer 44.

  Thereby, construction of the boundary wall structure 1 is completed. The inside of the constructed boundary wall structure 1 will be reclaimed with waste.

  According to this embodiment, the following effects can be obtained. That is, the parent pile 5 of the mountain retaining wall 3 forming the first wall portion 8 is firmly fixed to the ground 2 by the earth anchor 34 and has high strength. Therefore, the 1st wall part 8 formed by arrange | positioning the reinforced concrete 10 between the parent piles 5, and the 2nd wall part 9 comprised with the reinforced concrete 10 integral with this reinforced concrete 10 also have high intensity | strength.

  For this reason, the boundary wall 4 formed by the first wall portion 8 and the second wall portion 9 is fixed to the ground 2 with high strength. Moreover, since the boundary wall 4 is constructed using the protruding portion 5a of the parent pile 5, it can be constructed in parallel with the construction of the mountain retaining wall 3 after driving the parent pile 5.

  Moreover, since the lower end part 11 and the horizontal base part 14 as a part below the ground GL are integrally provided in the 1st wall part 8 and the 2nd wall part 9, making the boundary wall 4 stronger. it can. Further, the lower end portion 11 and the horizontal base portion 14 can prevent rainwater and the like from entering the inside of the boundary wall structure 1 to some extent.

  Therefore, the boundary wall 4 as a wall necessary for enclosing from the surroundings in the initial stage of the construction of the waste disposal section is a strong retaining wall that can be used semi-permanently in the subsequent disposal of waste and road construction. Easy to build. Thereby, the cost reduction of a waste disposal can be aimed at.

  In the boundary wall structure 1, the anchor head 36 and the anchor pedestal 38 protruding from the mountain retaining wall 3 constructed by the earth anchor method are covered with the anchor cover 43, and the outer sides thereof are the mountain retaining wall 3 and the boundary wall 4. Together with the waterproof coating layer 44.

  For this reason, even if the waste is buried inside the disposal section and the pressure from the waste is applied to the waterproof coating layer 44, the waterproof coating layer 44 has a portion due to the protrusions of the anchor head 36 and the anchor pedestal 38. There is no concentration of pressure enough to cause breakage in the part. Therefore, the construction of the inner wall of the disposal section as the mountain retaining wall 3 by the earth anchor method and the waterproofing of the inner wall by the waterproof coating layer 44 can be made compatible without any trouble.

  Further, the waterproof coating layer 44 has a flank covering portion 51 that covers the bulges 37a and 37b along the shape thereof, and the anchor cover 43 is erected at the intersection of the bulges 37a and 37b. It has the notch part 45 which avoids interference with 37a and 37b. As a result, the anchor cover 43 sufficiently covers the anchor head 36 and the anchor pedestal 38 up to the hem portion in contact with the wall surface of the mountain retaining wall 3 in spite of the erection 37a and 37b. be able to.

  Thereby, the waterproof coating layer 44 can be supported by the mountain retaining wall 3, the anchor cover 43, and the flank 37a and 37b without gap as much as possible. Thereby, the pressure from the waste provided to the waterproof coating layer 44 can be supported without hindrance. Therefore, even when the erections 37a and 37b are provided, both the construction of the mountain retaining wall 3 by the earth anchor method and the waterproofing of the mountain retaining wall 3 by the waterproof coating layer 44 can be achieved without any problem.

  Further, since the waterproof coating layer 44 includes the protective sheets 46a and 46b, the water shielding sheets 47a and 47b, and the outermost urethane layer 48, the pressure from the waste is more effectively applied to the protective sheets 46a and 46b and the urethane layer 48. Can be dispersed. Thereby, the breakage of the water shielding sheets 47a and 47b can be prevented, and the function of the waterproof coating layer 44 can be favorably maintained.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the anchor cover 43 is not limited to a rectangular parallelepiped shape, but may be a hemispherical shape, a cylindrical shape, or a polyhedral shape such as a seven-sided shape. Further, the boundary wall structure 1 may be such that the anchor base 38 directly supports the anchor head 36 on the mountain retaining wall 3 without going through the flank 37a and 37b. Further, the boundary wall 4 may not have the lower end portion 11 and the horizontal base portion 14.

  DESCRIPTION OF SYMBOLS 1 ... Boundary wall structure, 2 ... Ground, 3 ... Yamadome wall, 4 ... Boundary wall, 5a ... Projection part, 8 ... 1st wall part, 9 ... 2nd wall part, 10 ... Reinforced concrete, 11 ... Lower end part, DESCRIPTION OF SYMBOLS 12 ... Integrated part, 13 ... Extension part, 14 ... Horizontal base, 15 ... Transverse muscle (1st transverse muscle), 16 ... Transverse muscle (2nd transverse muscle), 18 ... Transverse muscle (3rd transverse muscle), 19 ... Transverse muscle (4th transverse muscle) 22, 22, 26, 28, 30 ... transverse stripes, 27, 29, 31 ... longitudinal stripes, 20, 24, 25 ... stirrup, 34 ... earth anchor, 35 ... tendon, 36 ... anchor head, 38 ... anchor base, 43 ... Anchor cover, 44 ... Waterproof covering layer, 49 ... Wall covering, 50 ... Cover covering, GL ... Ground.

Claims (4)

A boundary wall structure comprising a boundary wall standing on a mountain retaining wall by an earth anchor method,
The mountain retaining wall includes a plurality of parent piles having protrusions protruding above the ground,
The boundary wall is
A first wall portion formed by the reinforced concrete disposed between the protruding portions of the adjacent parent piles and the protruding portion;
A reinforced concrete integral with the reinforced concrete of the first wall and a second wall formed on the outside of the first wall.
The second wall portion includes an integral portion that is integrated with the first wall portion along the first wall portion, and an extension portion that extends upward from an upper end of the first wall portion. Boundary wall structure. The first wall portion has a lower end portion existing in a range from the ground to a predetermined depth,
The lower end portion is formed of a portion corresponding to the existence range of the lower end portion in the plurality of parent piles, and reinforced concrete arranged as an integral part of the reinforced concrete between the protruding portions between the adjacent corresponding portions. And
The second wall portion has a horizontal base that exists in a range from the ground to a predetermined depth and projects outward in the horizontal direction from the outer wall surface of the integral portion of the second wall portion,
2. The boundary wall structure according to claim 1, wherein the horizontal base is formed of reinforced concrete at the lower end portion and reinforced concrete integral with the reinforced concrete at the integral portion. The reinforced concrete constituting the first wall portion and the second wall portion extends along the inner wall surface of the first wall portion, is bent at the upper end portion of the first wall portion, and further, A plurality of vertical bars extending along the outer wall surface of the extension,
The reinforced concrete of the first wall portion includes a first horizontal bar that is passed between the upper ends of the adjacent parent piles, and a second horizontal bar that extends above the first horizontal bar,
The reinforced concrete of the second wall portion includes a third horizontal bar arranged at the same height as the first horizontal bar, and a fourth horizontal bar arranged at the same height as the second horizontal bar,
The boundary wall structure according to claim 1 or 2, wherein the first to fourth transverse bars are connected by a plurality of stirrups. The mountain wall,
An earth anchor having a tendon with a base end protruding from the mountain retaining wall and an anchor head fixed to the base end;
An anchor pedestal that supports the anchor head against the mountain retaining wall against the tension applied to the tendon;
An anchor cover that covers the space including the anchor head and the anchor base;
A waterproof covering layer that integrally covers the inner wall of the mountain retaining wall and the boundary wall including the anchor cover;
The waterproof coating layer is
A wall surface covering portion covering the mountain retaining wall and the boundary wall along the wall surface;
The boundary wall structure according to any one of claims 1 to 3, further comprising a cover covering portion that covers the anchor cover along an outer surface thereof.