JP2000257088A - Earth retaining wall and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support a concrete retaining wall by arranging supporting posts on the mountain side and construct an earth retaining wall so as not to produce irregularities on the valley side of the concrete retaining in constructing the earth retaining wall. SOLUTION: An earth retaining wall 12 is fixed by constructing an improved pile 10 at specified depth in the ground and erecting a reinforcing steel material 11 before the improved pile is hardened. Thereafter, the earth retaining wall integrating supporting posts and a concrete retaining wall is constructed by depositing concrete after combining reinforcing bars of the supporting posts 13 formed around the reinforcing steel material as their center with reinforcing bars of the concrete retaining wall 14. Thereby, a surface exposed on a ground surface of the concrete retaining wall is formed as a flat surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining wall constructed on a residential land, etc., and more particularly, a concrete retaining wall constructed by casting concrete so as to be integrated with a foundation constructed with improved piles. Retaining wall.

[0002]

2. Description of the Related Art When constructing a house or the like on an inclined land, a high ground is excavated, and the excavated soil is embanked on a low ground, so that a predetermined section is leveled as a flat ground. Under construction. At the leveling construction site, for example, when constructing a terraced residential area, it is necessary to construct a retaining wall between the lower residential area and the upper residential area. Therefore, in general, the embankment portion is supported by constructing the retaining wall to protect the embankment portion of the upper ground. Conventionally, the retaining wall is often constructed by stacking stones or concrete blocks. In addition, a construction method such as directly casting and constructing a concrete retaining wall is used.

[0003] Instead of directly constructing the retaining wall with concrete or stone clogging, an existing concrete L-shaped member is used. For example, as shown in FIG. 7, a groove having a predetermined width and depth is excavated at a position corresponding to the end of the embankment, and concrete L
The mold retaining wall 20 is arranged. Then, the horizontal member 22
Is fixed by constructing an embankment 23, and the end of the embankment is supported by the vertical wall member 21 of the L-shaped retaining wall. In addition, as shown in FIG. 8, the horizontal member 22 of the L-shaped retaining wall 20 is also used as a support member for a foundation 25 of a building 24. When the foundation 25 on the valley side of the building is supported by the horizontal member 22, the weight of the building is given to the horizontal member in addition to the weight of the embankment, so that the stability of the L-shaped retaining wall 20 is improved. Can be.

[0004] In addition to the above examples, in the case of soft ground, since the supporting action on the L-shaped retaining wall cannot be sufficiently exhibited, as shown in FIG. In some cases, the construction is carried out so as to be supported. When the L-shaped retaining wall is supported using the improved pile, as shown in FIG. 9A, the improved pile reaching a position at a predetermined depth from the soft ground 26 to the hard ground 27 is used. Construction is carried out, and the L-shaped retaining wall 20 is supported on the pile row to perform embankment. Further, the pile row is constructed in a plurality of rows at predetermined intervals in the length direction of the L-shaped retaining wall, improves the stability of the L-shaped retaining wall on soft ground, and favorably supports the embankment. It is possible to demonstrate.

[0005]

However, when the retaining wall is constructed using the L-shaped retaining wall, it is necessary to excavate a groove for burying a horizontal member of the L-shaped retaining wall. It is needed and the work raises the construction cost. In addition, a large amount of excavated soil is generated in the preparation stage of the construction of the L-shaped retaining wall, and there is also a problem of processing the excavated soil. Therefore, the present inventors have proposed to construct a retaining wall using an existing concrete plate member (PC plate) as disclosed in Japanese Patent Application Laid-Open No. 8-92981. In the above-mentioned conventional method, it is possible to easily construct the retaining wall by using a method in which a concrete plate is combined with an improved pile and attached.

However, since the PC board is relatively heavy, it may not be able to fully exhibit its advantages at a construction site or the like where the scaffold is not good, and there is a need for further improvement. Further, in the conventional example, an H-shaped steel as a reinforcing steel material is disposed inside a pre-made groove-shaped concrete product, and a PC board is integrated with the H-shaped steel through a number of connecting members such as bolts. Since the column member is filled with concrete to form a column member having a high strength, it is necessary to use a large number of connecting members and interval maintaining members in addition to the concrete product. Further, when the retaining plate is constructed by combining the PC board with the improved pile, it is required that the construction accuracy of the improved pile and the assembly precision of the PC board be strictly set, and the combination work is good. Otherwise, irregularities and the like are formed on the wall on the valley side, and a problem arises in that an unrecognizable mountain retaining wall is constructed.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem of the conventional retaining wall of the conventional type by removing unevenness on the valley-side surface of the wall member made of concrete, and integrating the support column with the mountain side of the wall member. An object of the present invention is to provide a retaining wall capable of favorably supporting a wall member.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a retaining wall for supporting an end of an embankment. The invention according to claim 1 of the present invention provides an improved pile constructed at predetermined intervals on the ground below a position where the retaining wall is to be constructed, and reinforcement for burying a base in each of the improved piles and fixing the base. It is composed of a steel material, a supporting column made of reinforced concrete with the reinforcing steel material as a core, and a concrete retaining wall constructed on the valley side of the supporting column using a reinforcing bar integrally combined with a reinforcing bar arranged on the supporting column. It is characterized by. Further, the invention of claim 2 is a step of constructing the improved piles at a predetermined interval in the ground below the position where the retaining wall is to be constructed, and burying a base of a reinforcing steel material in each of the improved piles. Fixing the reinforcing steel material, assembling the reinforcing steel of the supporting column with the reinforcing steel material as a core, assembling the reinforcing steel of the concrete retaining wall integrally with the reinforcing steel arranged on the supporting column, This is a method of constructing a retaining wall which is constructed through a step of constructing a form around a reinforcing bar, and a step of placing concrete inside the form. And the retaining wall constructed as described above can fix the base of the concrete retaining wall using the improved pile, and even in the ground state where a large value of earth pressure is applied to the concrete retaining wall. In addition, the retaining action on the embankment portion can be exhibited in a favorable state by the retaining wall.

According to a third aspect of the present invention, in the mountain retaining wall, the surface exposed to the valley side of the concrete retaining wall is formed in a flat shape, and the support columns are arranged in the shadow of the concrete retaining wall. It is characterized by providing support. Therefore, even in a construction site or the like constructed stepwise, the aesthetic appearance of the retaining wall that partitions each section is not impaired. The invention according to claim 4 uses an H-shaped steel as the reinforcing steel material and inserts it into the center of the improved pile at a stage before the improved pile is solidified, whereby the material of the improved pile is solidified, so that the base of the H-shaped steel is formed. Is fixedly held inside the improved pile. And, by supporting the improved pile via the reinforcing steel material, the strength of the concrete retaining wall can be sufficiently exhibited, and the concrete is cast in a formwork in a state of being integrated with the improved pile. In addition, there is no unevenness or the like on the valley-side surface of the retaining wall, and the retaining wall having high strength integrated with the H-section steel can be constructed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The retaining wall of the present invention will be described with reference to the illustrated example. In the embodiment of the present invention, when constructing an improved pile, a hole having a predetermined diameter is formed in the ground by an earth auger using an excavator. And, without excluding the soil in the hole formed by the auger, use a solidified material such as cement milk mixed with the soil remaining in the hole to construct an improved pile. Is assumed. In addition, it is also possible to target a concrete pile formed by removing the soil in a hole excavated by the earth auger to the ground and then putting concrete into the hole. However, as the improved pile for supporting the retaining wall described below, the improved pile prepared by mixing the former soil and the solidified material will be described.

The example shown in FIG. 1 describes a process of constructing an improved pile 10 at a position where a retaining wall is constructed.
The improved pile 10 is excavated to a depth L with a predetermined diameter D using an excavator such as an earth auger, and cement milk or other coagulant is mixed into the soil in the hole to form a coagulant. To build a columnar pile. In this embodiment, before the solidified material of the improved pile 10 is solidified,
As shown in FIG. 2, an H-shaped steel is buried by pushing it into the center of the improved pile as a reinforcing steel material 11, and a column slightly lower than the planned height of the concrete retaining wall is erected. Then, by solidifying the solidified material of the improved pile 10, a foundation member of the retaining wall in which the improved pile and the reinforcing steel material are integrated is constructed.

Next, as shown in FIGS.
19a is constructed. When assembling the reinforcing bars, the reinforcing bars 17 of the support columns 13 are constructed so as to surround the reinforcing steel material 11, and the reinforcing bars 17 are connected to the reinforcing bars 17, and the longitudinal reinforcing bars 15 and the horizontal reinforcing bars 16 for the concrete retaining wall are respectively constructed. . Accordingly, by assembling the reinforcing bars as described above, the reinforcing bars of the supporting columns 13 and the concrete retaining walls 14 are connected to each other, and the supporting columns and the concrete retaining walls are integrated by casting concrete. The retaining wall 12 can be constructed.

After assembling the rebar as shown in FIG. 3,
When concrete is poured into the inside of the formwork and the concrete is hardened, as shown in FIGS. 4 and 5, the retaining wall 12 with the support pillar 13 positioned on the mountain side of the concrete retaining wall 14.
Is formed. And in the said retaining wall 12,
The surface exposed to the valley side is formed substantially flush, and is formed as a retaining wall having no irregularities on the surface. Further, in the mountain retaining wall 12, the support pillar 13 constructed on the improved pile is integrated through the reinforcing steel material 11, and the concrete retaining wall 14 constructed between the support pillars 13 is formed. In this example, the ends of the sections are connected via support columns 13 and are integrated with the columns and supported on the improved pile.

The retaining wall 12 shown in this embodiment is shown in FIG.
In, the reinforcing steel material to bury the base for the improved pile, by arranging along the construction planning surface of the retaining retaining wall, there is a case where the construction accuracy when driving the improved pile is not good Also, it can correct that the valley side of the retaining wall is distorted. Further, even if there is a problem in the vertical construction accuracy of the reinforcing steel material, since the supporting column 13 to be constructed including the reinforcing steel material is constructed as a relatively large cross-sectional area, a mold is integrally formed with the supporting column. When constructing a concrete retaining wall by assembling a frame, it is possible to increase the construction accuracy of the formwork so that the exposed wall surface does not have irregularities or the like.

After the retaining wall 12 is constructed as described above, as shown in FIG. 6, the soil excavated from a high place is filled up to the height of the concrete retaining wall 14, and the end of the embankment 2 is filled. The part is supported by concrete retaining walls so that houses and the like can be constructed on artificially created ground. Further, in the retaining wall 12 shown in the present embodiment, the improved pile 10 constructed so as to be buried in the hard ground is constructed so as to have strength enough to withstand the pressure of the embankment and the like. By calculating taking into account conditions such as earth pressure, the diameter and the burial depth are set.

Further, in the reinforcing steel material 11 in which the base is buried in the improved pile, the load supported by the reinforcing steel material is calculated according to the height of the concrete retaining wall to be constructed and the conditions of the ground. Conditions such as the strength and the spacing between the concrete retaining walls are set in accordance with the construction area. Then, as shown in FIG. 4, the thickness W and the strength of the support column 13 constructed via the reinforcing steel material whose base is buried in the improved pile, and the concrete connected to the reinforcing steel of the support column 13 and arranged. Conditions such as the arrangement interval of the reinforcing bars of the retaining wall and the wall thickness W are also set based on the above calculation.

In the retaining wall 12, a support pillar is erected on the back side of the concrete retaining wall 14 to be integrated, and only the concrete retaining wall is exposed on the valley side of the retaining wall. As is apparent from the above description, in order to support the concrete retaining wall from the back, it is necessary to accurately connect the supporting columns and the reinforcing steel bars 15 to 17 of the concrete retaining wall. For that purpose, it is also possible to take measures such as using the rebar of the two members in common, or adding an oblique rebar to the connection part for construction. Further, as the reinforcing steel material, a steel material having an arbitrary cross section can be used in addition to the H-shaped steel.

[0018]

Since the retaining wall of the present invention is constructed as described above, an improved pile constructed at predetermined intervals on the ground below the location where the retaining wall is to be constructed. And a reinforcing steel material for burying and fixing a base to each of the improved piles, a supporting column made of reinforced concrete having the reinforcing steel material as a core, and a reinforcing bar integrally combined with a reinforcing bar arranged on the supporting column, By integrating the concrete retaining wall built on the valley side of the support pillar, the base of the concrete retaining wall can be fixed using the improved pile, and a large value of earth pressure is applied to the concrete retaining wall Even in the state,
The embankment can be supported in a good condition. Also,
The mountain retaining wall is constructed in a step-like manner because the surface exposed to the valley side of the concrete retaining wall is configured as a plane, and the supporting columns are placed in the shadow of the concrete retaining wall to support the embankment. Even in a newly constructed site, the beauty of the retaining wall that partitions each section is not impaired. Furthermore, by using H-shaped steel as the reinforcing steel material and inserting it into the center of the improved pile before integration of the improved pile and integrating it with the improved pile, the strength of the concrete retaining wall can be fully exhibited. By casting concrete with a formwork integrated with the improved pile, there is no unevenness or the like on the valley side surface of the retaining wall,
A high-strength retaining wall integrated with the H-section steel can be constructed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a process of constructing an improved pile on the ground.

FIG. 2 is an explanatory view of a process of erecting a reinforcing steel material on an improved pile.

FIG. 3 is an explanatory diagram of a process of assembling a support pillar, a reinforcing steel bar of a concrete retaining wall, and a formwork.

FIG. 4 is an explanatory diagram showing a configuration of a retaining wall and an arrangement of reinforcing bars.

FIG. 5 is a side view of the retaining wall of FIG. 4;

FIG. 6 is an explanatory view showing a state in which embankment is constructed.

FIG. 7 is an explanatory view of a retaining wall using a conventional L-shaped retaining wall.

FIG. 8 is an explanatory view of another example of a retaining wall with a conventional L-shaped retaining wall.

FIG. 9 is an explanatory diagram of another example of a retaining wall using a conventional L-shaped retaining wall.

[Explanation of symbols]

1 ground, 2 embankment, 10 improved pile, 11
Reinforced steel, 12 retaining walls, 13 support columns,
14 concrete retaining wall, 15-17 rebar,
19 formwork, 20 L type retaining wall, 21 vertical wall member, 22 horizontal member, 23 embankment, 24
Building, 25 Building foundation, 26 Soft ground, 2
7 Hard ground, 28 improved piles.

Claims (4)

[Claims] 1. An improved pile retaining wall supporting an end of an embankment portion, comprising: an improved pile constructed at a predetermined interval on a ground under a position where the retaining wall is constructed; and each of the improved piles. A reinforcing steel material having a base buried in the base and fixed thereto; a supporting column made of reinforced concrete having the reinforcing steel material as a core; and a reinforcing bar integrally combined with a reinforcing bar disposed on the supporting column, and constructed on a valley side of the supporting column. A retaining wall characterized by being composed of a concrete retaining wall that is made. 2. A retaining wall for supporting an end of an embankment portion, wherein a step of constructing an improved pile on a ground under a position where the retaining wall is to be constructed at a predetermined interval, A step of burying and fixing the base of the reinforcing steel material to each of the improved piles; a step of assembling the reinforcing steel of the support pillar with the reinforcing steel as a core; and the reinforcing steel of the concrete retaining wall integrally with the reinforcing steel arranged on the support pillar. Assembling, comprising: a step of assembling; a step of constructing a formwork so as to surround the reinforcing column and the reinforcing steel of the concrete retaining wall; and a step of casting concrete inside the formwork. Wall construction method. 3. The concrete retaining wall according to claim 3, wherein a surface exposed to the valley side of the concrete retaining wall is formed in a planar shape, and a supporting column is arranged in a shadow of the concrete retaining wall to support the embankment. The retaining wall according to claim 1, wherein: 4. An H-shaped steel is used as the reinforcing steel material, and is inserted into the center of the improved pile before the improved pile is solidified, and the material of the improved pile is solidified, thereby improving the base of the H-shaped steel. The retaining wall according to claim 1, wherein the retaining wall is fixed and held inside a pile.