JP7138281B2 - Embankment wall structure - Google Patents

Description

The present invention relates to a wall structure of an embankment, and more particularly to a wall structure of an embankment formed of air bubble mixed lightweight soil.

The FCB method (Formed Cement Banking Method) is a mixture of raw material soil (sandy soil), cement, water and air bubbles, or mixed cement, water and air bubbles (Formed Mixture Light-weight Soil). This is the lightweight embankment construction method used. Aerated lightweight soil is lightweight, fluid (in a fresh state), easy to construct, and highly economical. Taking advantage of these characteristics, the FCB construction method is widely applied to roads, bridges, embankments of structures, etc. on soft ground, backfills, embankments on steep slopes, and the like.

Here, since the foamed lightweight soil is a fluid material before it hardens, it requires a formwork like concrete, and it also needs to protect the surface after hardening. Therefore, the wall panel is used as the remaining formwork, serving both as a formwork and a surface protection material. A construction method is adopted in which the walls are integrated and left as they are as a wall protecting the surface (see, for example, Patent Documents 1 and 2).

Japanese Patent Application Laid-Open No. 2002-242189 Japanese Patent Application Laid-Open No. 2002-188148

However, in recent years, it has been found that the embankment of the wall structure formed by the above-described conventional construction method has the following problems.
First, the joints of the wall panel used as the remaining formwork were waterproofed with sealing material, etc., but due to insufficient adhesion of the sealing material to the wall surface and deterioration over time, the embankment body made of hardened foam-mixed lightweight soil Slough leakage due to retarding water occurred, and the wall surface was locally soiled. It was difficult to take countermeasures against this, because new slag leakage occurs even if the cleaning is performed temporarily.
In addition, since the wall panel, which also serves as a formwork, is in direct contact with and integrated with the embankment body, which is made of hardened foam-mixed lightweight soil, it is directly affected by the deformation of the embankment body and the water retention on the back of the panel. Panels are prone to cracking, peeling off due to corrosion of panel fixing metal fittings, etc., and if wall paneling is cracked or peeling, it is difficult to replace the wall panel, and at the same time it is integrated when replacing the wall panel. There was also a risk of damaging the foamed lightweight mixed soil hardening material.

The present invention has been made in view of the problems of the above-mentioned background art, and its purpose is to reduce the influence of water retention and deformation from the main body of the embankment, and to perform maintenance work such as replacement of the wall surface. To propose a wall structure of an embankment which can easily perform

In order to achieve the above object, the present invention provides the wall structure of embankment described in the following [1] to [4].
[1] The structure of the wall surface of the embankment constructed by filling the back of the erected wall surface with a hardening embankment material, comprising a plurality of pillars erected on the ground at intervals, and the pillars. A wall structure of an embankment, characterized by comprising a formwork panel arranged on the back side of the support and a wall panel arranged on the surface side of the support.
[2] The embankment wall structure according to the above [1], wherein the embankment material having hardenability is a foamed lightweight soil.
[3] The embankment wall structure according to [1] or [2] above, characterized in that a waterproof sheet is further arranged on the back side of the formwork panel.
[4] The embankment wall structure according to any one of [1] to [3], characterized in that support anchors embedded in the filled embankment material are connected to appropriate positions of the pillars.

According to the wall structure of the embankment according to the present invention described above, unlike the wall structure consisting of a single wall panel that serves as a surface protection material and a formwork, the embankment material is a formwork arranged on the back side of the support column. Although it is in contact with the panel, it has a structure that does not directly contact the wall panel arranged on the surface side of the support. Therefore, the wall panel is not integrated with the main body of the embankment, which is a hardened body of the embankment material, and is not directly affected by water retardation, deformation, etc. from the main body of the embankment, and cracks, peeling, etc. . In addition, even if the wall panel is cracked, peeled off, etc., it can be replaced easily because it is not integrated with the embankment body, and the embankment body is not damaged. In addition, since the space between the wall panel and the formwork panel serves as a passage for water, retarding water from the embankment body does not reach the surface side of the wall panel, making it difficult for the wall surface to become dirty due to slag leakage.

1 is a conceptual longitudinal sectional view showing an example of embankment using the wall surface structure of the present invention; FIG. It is the figure which expanded and showed the A section of FIG. FIG. 2 is a conceptual side view showing an example of the method of constructing the wall surface structure of the embankment according to the present invention, and mainly showing a step of erecting the pillars. FIG. 2 is a conceptual side view showing an example of the method of constructing the wall surface structure of the embankment according to the present invention, and mainly showing the step of erecting the support columns to the step of arranging the wall panel. 1 is a conceptual perspective view showing an example of a construction method for a wall surface structure of embankment according to the present invention, and mainly showing a step of arranging wall panels. FIG. FIG. 2 is a conceptual side view showing an example of a construction method for a wall structure of an embankment according to the present invention, and mainly showing a process of placing a formwork panel to a process of placing an embankment material. FIG. 2 is a conceptual perspective view showing an example of a construction method for a wall surface structure of embankment according to the present invention, and mainly showing a step of arranging a formwork panel. 1 is a conceptual perspective view showing an example of a construction method for a wall surface structure of an embankment according to the present invention, and mainly showing a step of placing an embankment material. FIG. It is a conceptual side view showing an example of the construction method of the wall surface structure of the embankment according to the present invention, mainly from the step of installing the net material above the hardened embankment material to the step of connecting the support anchors to the pillars. It is a diagram showing. FIG. 2 is a conceptual side view showing an example of a construction method for a wall surface structure of an embankment according to the present invention, and is a diagram mainly showing a process of placing a plurality of embankment materials from a process of connecting columns upwards. . FIG. 2 is a conceptual side view showing an example of the construction method of the wall surface structure of the embankment according to the present invention, and mainly showing the finishing process of the crown.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the wall surface structure of the embankment based on this invention is described in detail, referring attached drawings.

FIG. 1 is a conceptual vertical cross-sectional view showing an example of embankment using the wall structure of the present invention, and FIG. 2 is an enlarged view of part A in FIG.
The illustrated embankment 1 is constructed by filling a hardening embankment material 50 behind an erected wall surface 10 . The illustrated embankment 1 shows a so-called widening embankment on a slope, in which the embankment material 50 is filled between the ground 60 and the built wall surface 10, but the present invention is not limited to such a widening embankment. A hardening embankment material is filled between the built walls on both sides, and the embankment is used as roads, abutments, self-supporting walls, retaining walls, etc., and the surroundings are surrounded by constructed walls, with hardening inside. Filled with existing embankment materials, it is widely targeted for reclaimed land and embankments used as foundations for buildings. In addition, the embankment material to be filled does not need to be of the same quality throughout the embankment. For example, the lower part is filled with synthetic resin foam blocks as the embankment material, and the upper part is foamed rigid urethane foam, foam mixed lightweight soil, etc. Even an embankment filled with an embankment material having a hardening property of 100.degree.

The wall surface 10 includes a plurality of supports 20 standing on the ground 61 at intervals, a formwork panel 30 arranged on the back side (framework side) of the support 20, and a front surface of the support 20. It is formed in a multi-layer (two-layer) structure consisting of the wall panel 40 arranged. The multi-layered (two-layer) wall structure should be employed at least on the wall surface of the portion filled with hardening embankment material such as foamed rigid urethane foam or air-laid mixed lightweight soil.

The pillars 20 have their lower ends embedded in the foundation concrete 21 formed on the ground 61, and are erected in a state in which a plurality of pillars 20 are lined up at equal intervals, for example, about 500 mm. Each support 20 may be a single elongated one, or may be formed by connecting divided supports divided into a plurality of upper and lower stages. In the strut 20 according to the illustrated embodiment, two divided struts 20A and 20B are connected by a joint fitting 22. As shown in FIG.

The struts 20 may be made of hot-dip galvanized steel, or may be made of other materials having excellent corrosion resistance. In addition, L-shaped steel, C-shaped steel (lip channel steel), H-shaped steel, square shaped steel, or the like can be used for the strut 20 . Support anchors 23 embedded in the filled embankment material 50 can be connected to suitable positions in the vertical direction of the pillars 20 as required.

The formwork panel 30 arranged on the back side (framework side) of the column 20 may be made of a so-called "companie" made of wood made of South Sea wood, plywood, or the like, made of steel, made of cement, or made of cement. A wide range of materials generally used as molds, such as those made of synthetic resin, can be used. Considering workability by human power, a size of about 3×6 size (910 mm×1820 mm) or less is appropriate, but the size is not limited to this.

The form panel 30 can be stacked from the lower side in a state of blocking the space between the adjacent pillars 20, 20 on the rear side (framework side) of the erected pillars 20. As shown in FIG. The formwork panel 30 may be attached directly to the back side of the column 20 using a screw or the like, or may be attached in a floating state to the back side of the column 20 using a fixture such as a separator. . Since these screws, fittings, etc. require long-term corrosion resistance, they are made of hot-dip galvanized or stainless steel. In the embodiment illustrated in FIG. 2, a formwork panel 30 is mounted in direct contact with the rear side of the column 20 using screws 31 . The joints between the arranged formwork panels 30 can be filled with a sealing material, and a waterproof sheet 70 is further arranged on the back side of the arranged formwork panels 30 as necessary. be able to.

As the wall panel 40 arranged on the surface side of the column 20, the surface part of the built embankment structure is improved in appearance, that is, the appearance is improved, and the surface part of the embankment structure is protected. A cement-based panel, a synthetic resin-based panel, a metal-based panel, or the like can be used. Considering the workability by human power, the suitable size is about 3×6 size (910 mm×1820 mm) or less. It is easy to increase the size, and a larger wall panel may be handled by mechanical construction using heavy machinery.

The wall panel 40 can be stacked from the lower side in a state of blocking the space between the adjacent pillars 20 on the surface side of the pillars 20 erected. Further, the wall panel 40 may be attached directly to the surface side of the column 20 using a screw or the like, or may be attached in a floating state to the surface side of the column 20 using a mounting tool. In the embodiment illustrated in FIG. 2 , the wall panel 40 is attached to the support 20 in a floating state by means of attachments 41 . The joints between the arranged wall panels 40 can be filled with a sealing material in consideration of waterproofing.

Examples of the hardenable embankment material 50 filled behind the wall surface 10 of the above-described structure include concrete, rigid urethane foam foamed on site, and foamed lightweight soil. Among these, raw material soil (sandy soil) mixed with cement, water, and air bubbles, or formed mixture light-weight soil (formed mixture light-weight soil), which is a mixture of cement, water, and air bubbles, is lightweight and fluid (fresh). condition), easy workability, and excellent economic efficiency, so it is preferably used as an embankment material. In the illustrated embodiment, foamed lightweight soil is used as the embankment material 50, and the impermeable sheet 70 is arranged not only on the back side of the formwork panel 30, but also from the ground 61 to the natural ground 60 side. The upper portion is filled with air bubble mixed lightweight soil 50 .

The filling of the air bubble mixed lightweight soil 50 is carried out in several steps to avoid collapse of the air bubbles due to its own weight. An embankment body is constructed in which the netting material 71 is buried in. The bed net material 71 is installed for the purpose of reinforcing the embankment body and suppressing cracks, and it is preferable to use JIS G3551 (φ3.2 × 100 × 100 mm) with anti-corrosion treatment equivalent to JIS H8641 HDZ35. can. A waterproof sheet 70 is laid on the upper surface of the embankment main body made of the hardened body of the foamed lightweight soil 50, and a crown concrete 72 is formed above it. A water stop plate 73 is provided at the top of the wall surface 10 .

Next, an example of the construction method of embankment having the wall surface structure according to the present invention will be described with reference to the drawings.

First, as shown in FIG. 3(a), leveling concrete 24 is formed on the ground 61 at the construction position α of the wall surface, and inserting reinforcements 25 are arranged. Next, as shown in FIG. 3(b), the column 20 is erected using temporary materials 26, and a foundation formwork is attached to the lower end of the erected column as shown in FIG. 3(c). 27 is installed, and the formwork is fixed with separator fixtures 28. Subsequently, as shown in FIGS. 4(a) and 4(b), concrete is poured into the formed form 27 to form the foundation concrete 21. Next, as shown in FIGS. As a result, the pillars 20 whose lower ends are embedded in the foundation concrete 21 are erected on the ground 61 at the construction position α of the wall surface over a required length at equal intervals, for example, about 500 mm. In addition, it is preferable to install a width stopper fixing member 29 across the erected pillars 20, 20 so as to maintain the space therebetween.

Subsequently, as shown in FIGS. 4(c) and 5, the wall panel 40 is arranged from the lower side on the surface side of the erected pillars 20 in such a manner as to block the space between the adjacent pillars 20, 20. set up. The wall panel 40 may be attached to the pillars 20 using screw screws, fixtures 41, and the like. In addition, the joints between the arranged wall panels 40 are filled with a sealant if necessary.

After stacking the wall panels 40 to the required height and arranging them, as shown in FIGS. Formwork panels 30 are arranged in a closed state from the lower side. The mounting of the formwork panel 30 to the pillars 20 may be performed using screws, fixtures 31, etc., in the same manner as in the case of the wall panel 40. FIG. In addition, the joints between the arranged formwork panels 30 are filled with a sealing material as necessary. As a result, a wall surface composed of the wall panel 40 is formed on the front side, and a wall surface composed of the form panel 30 is formed on the back side, with the support column 20 interposed therebetween.

Subsequently, as shown in FIG. 6(b), the water impervious sheet 70 is applied from the back side of the formed form panel 30 to the ground 61 and further to the surface of the natural ground 60 (not shown). , and as shown in FIGS. 6(c) and 8, on top of the impermeable sheet 70, the foamed lightweight soil, which is the embankment material 50, is placed up to a predetermined height. Considering the crushing of bubbles due to their own weight, it is appropriate that the height of one placement is about 50 to 100 cm.

After the placed air bubble mixed lightweight soil 50 hardens, as shown in FIG. On the bed netting material 71 thus formed, the bubbly mixed lightweight soil, which is the embankment material 50, is placed again up to a predetermined height. As a result, it is possible to construct an embankment main body in which the netting material 71 is buried at an appropriate position in the height direction.

Next, as shown in FIG. 9(c), the form panel 30, the impermeable sheet 70, etc. are additionally installed above, and the laying net material 71 is laid above the hardened foamed lightweight soil 50. and then connect the support anchors 23 to the struts 20 . Subsequently, the bubbly mixed lightweight soil, which is the embankment material 50, is placed again up to a predetermined height. As a result, the embankment main body can be constructed in which the support anchors 23 for supporting the pillars 20 as well as the bed net material 71 are buried at appropriate positions in the height direction.

Subsequently, as shown in FIG. 10( a ), the pillars 20 are spliced upward by the joint fittings 22 , the wall panel 40 is arranged on the surface side, and the formwork panel 30 is arranged on the back side, and the foam mixed lightweight soil is formed. By repeating the above-described steps such as placing 50, the embankment main body is constructed step by step as shown in FIG. 10(b).

After completing the placement of the air bubble mixed lightweight soil 50 up to the top of the column 20 and constructing the embankment body with the design height, as shown in FIG. is closed by attaching a water stop plate 73 to the upper end of the wall surface 10 of a multilayer (two-layer) structure in which a wall surface made of a form panel 30 is formed on the back side, and the built embankment body A top concrete 72 is constructed by laying a waterproof sheet 70 on the upper surface and placing concrete above it. Thus, the embankment 1 is completed.

According to the structure of the wall surface 10 of the embankment according to the present invention described above, although the embankment material 50 is in contact with the formwork panel 30 arranged on the back side of the column 10, the wall surface arranged on the surface side of the column 10 It becomes the structure which does not touch the panel 40 directly. Therefore, the wall panel 40 is not integrated with the embankment main body, which is a hardened body of the embankment material 50, and is not directly affected by water retardation, deformation, etc. from the embankment main body, and cracks, peeling, etc. are unlikely to occur. becomes.
Also, even if the wall panel 40 should crack or peel off, it can be easily replaced because it is not integrated with the embankment body, and the embankment body will not be damaged. In addition, since the space between the wall panel 40 and the formwork panel 30 serves as a passage for water, retarding water from the embankment body does not reach the surface side of the wall panel 40, and dirt due to slag leakage from the wall surface is unlikely to occur. Become.

As mentioned above, although embodiment of the wall surface structure of the embankment which concerns on this invention was described, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It is obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. Moreover, it is clear from the description of the scope of the claims that the forms with such modifications or improvements can also be included in the technical scope of the present invention.

According to the present invention, the wall structure is less susceptible to the effects of impounding water, deformation, etc. from the main body of the embankment, and facilitates maintenance work such as replacement of the wall surface. It can be widely applied as embankments used as walls, retaining walls, etc., and as wall structures of embankments that serve as foundations for reclaimed land and buildings.

1 Embankment 10 Wall surface 20 Post 20A, 20B Division post 21 Foundation concrete 22 Joint metal fitting 23 Support anchor 24 Leveled concrete 25 Reinforcement 26 Temporary material 27 Foundation formwork 28 Bar arrangement 29 Width stop fixing material 30 Formwork panel 31 Screw screw 40 Wall panel 41 Fixture 50 Embankment material (air bubble mixed lightweight soil)
60 natural ground 61 ground 70 impermeable sheet 71 netting material 72 crown concrete 73 water stop plate α construction position of wall surface

Claims (3)

A structure of the wall surface of the embankment constructed by filling a hardening embankment material behind the erected wall surface,
Multiple pillars erected on the ground at intervals,Stacked from the lower side in a state that blocks the space between adjacent pillarsa formwork panel disposed on the back side of the support;Stacked from the lower side in a state that blocks the space between adjacent pillarsand a wall panel disposed on the surface side of the support,
A water passage is provided between the form panel and the wall panel,
The joints between the formwork panels are filled with a sealing material,
A waterproof sheet is arranged from the back side of the stacked form panels to the ground. An embankment wall structure characterized by: 2. The embankment wall structure according to claim 1, wherein support anchors embedded in the filled embankment material are connected to appropriate positions in the height direction of the pillars . 3. The embankment wall structure according to claim 1 or 2, wherein the hardenable embankment material is foamed lightweight soil .

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