JPH06248653A - Construction of foundation on slope - Google Patents

Abstract

PURPOSE:To efficiently execute works for landslide protection and construction of foundation on a slope. CONSTITUTION:A number of holes 1 are formed on lines that run approximately along the contour lines over a slope, and the holes 1 are made to be communicated with one another and a ditch-like cavity is formed therewith. Then, a continuous wall 2 is made with concrete cast in the cavity. The continuous walls 2 are formed likewise in appropriate positions on the slope. Flat parts 3 are then formed by cutting sections between each of the continuous walls 2 and on the foot-side of a continuous wall 2 facing the foot. Precast concrete cross beams 4 are fixed, bridging the upper ends of the continuous walls 2 protruding beyond the flat parts 3 and arranged in rows, and after that foundation concrete 5 is cast to cover the surfaces of the continuous walls 2 and the cross beams 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a foundation portion when constructing a structure on an inclined surface.

[0002]

2. Description of the Related Art Generally, when constructing a building on an inclined surface, it is constructed by the method shown in FIGS.
That is, when constructing the building 21 on the inclined surface 20 as shown in FIG. 4, first, as shown in FIG. 5, a mountain retaining member 22 is provided on the inclined surface 20, and the earth anchor 23 is struck on the mountain retaining member 22 to collapse the building. prevent. This mountain retaining member 22 is temporary, and the mountain side retaining member 22 on the valley side is removed when the building 21 is constructed as shown in FIG. At this time, the piles 24, 24 are struck and the building 21 is constructed based on this.

[0003]

By the way, although the earth anchor is indispensable in the above-mentioned conventional method, it may not be able to be driven in when the ground is particularly soft. In addition, the possibility of spring water is generally high in the sloping land, and there are cases in which construction of earth anchors and work of removing the mountain cleat are dangerous, and sufficient safety cannot be ensured.

Further, in the conventional method, since the mountain retaining is a temporary one, it is indispensable to remove and backfill it. However, since these processes generally become a critical path for the whole construction and determine the construction period, It is desired to shorten the construction period in these steps.

The present invention has been made in view of the above matters, and it is a technical object to provide a foundation construction method capable of efficiently and safely performing mountain retaining and foundation construction on an inclined surface.

[0006]

In order to solve the above-mentioned technical problems, the present invention adopts the following method in the method for constructing the foundation portion of a building on an inclined surface.

That is, (1) A large number of perforated portions 1 are formed on a straight line substantially along the contour line of the inclined surface. (2) The perforated portion 1 is continuously formed into a groove-shaped hollow, and concrete is poured into the hollow portion to form the connecting wall 2. (3) Similarly, the connecting wall 2 is formed at an appropriate position on the slope. (4) Subsequently, the flat side 3 is formed by cutting the valley side of the communicating wall 2 located between the communicating walls 2 and 2 and on the valley side. (5) A horizontal beam 4 made of precast concrete bridging the connecting walls 2 and 2 is fixed at the upper end of the connecting wall 2 protruding from the flat portion 3. (6) A foundation concrete 5 is placed so as to cover the upper surfaces of the connecting wall 2 and the horizontal beam 4.

[0008]

By the above methods (1) to (3), even if the slope where the building is to be constructed is soft ground or there is a layer with spring water, it is possible to safely use the ground anchor without using it. It is possible to form a mountain stay consisting of the connecting wall 2.

The connecting wall 2 as a mountain retaining piece is not removed after the foundation is formed, but is directly used as a foundation pile. Therefore, the work of backfilling and removing the cleat becomes unnecessary.
Further, since the above method further bridges the connecting walls 2 and 2 with the horizontal beam 4 made of precast concrete to form an underground beam, the work of assembling and removing the concrete formwork is eliminated, and the foundation is constructed. The process is simplified.

[0010]

Embodiments of the present invention will be described with reference to FIGS. In this embodiment, a foundation for constructing a building is formed on the inclined surface A. First, a large number of perforated portions 1 are formed on a straight line substantially along the contour line of the inclined surface A by a single-axis auger excavator. At this time, the diameter of the hole is set to two stages, and the steel material 1a is driven into the small diameter hole portion as shown in FIG.

Then, the earth and sand between the above-mentioned many perforations 1 are removed and connected to form a groove-shaped cavity. Soil cement flows into this hollow portion to form the connecting wall 2. As another method of forming the connecting wall 2, at the time when the perforated portion 1 is formed, a steel pipe to be fitted into the perforated portion 1 is driven and soil cement is flown into the steel pipe, and then the perforated portions 1 are continuously connected. Such an ONS construction method may be used.

Similar to the above-mentioned process, the connecting wall 2 is formed at an appropriate position on the mountain side or the valley side of the slope. As a result, the connecting wall 2 is arranged in a stepwise manner. Then, after the soil cement is sufficiently cured, the flat side 3 is formed by cutting the valley side of the communicating wall 2 located between the communicating walls 2, 2 and on the valley side. Here, each of the connecting walls 2 and 2 acts as a mountain retaining wall, and since it is formed by flowing concrete into the soil, it has good adhesion to the soil and does not require a ground anchor.

The connecting wall 2 is set so that its upper end projects from the flat surface portion 3 leveled by about several tens of centimeters. Note that, as shown in FIG. 3, the reinforcing bars 10 are passed through the inside of each connecting wall 2 in the vertical and horizontal directions.
Expose from the top.

Subsequently, a port gusset plate 6 is attached to the side surface of each connecting wall 2. This connection gusset plate 6
Is made of a rectangular iron plate, and is bolted so that both ends of the connection gusset plate 6 project from both side surfaces of each communication wall 2. Then, bolt holes (not shown) are provided in portions projecting from both side surfaces of the connecting wall 2.

After that, a horizontal beam 4 bridging the connecting walls 2 and 2 is fixed at the upper end of the connecting wall 2. The cross beam 4 is made of precast concrete, and is formed into a predetermined shape in a factory, a work yard, or the like in advance. Perforations corresponding to the bolt holes of the finish gusset plate 6 are provided at both ends of the cross beam 4, and are fixed to the finish gusset plate 6 by bolts 7 as shown in FIG.

Then, a concrete foundation 5 is cast in situ so as to cover the upper surfaces of the connecting wall 2 and the horizontal beam 4. At this time, the exposed reinforcing bars 10 are covered with the basic concrete 5 and firmly fixed as described above.

As described above, since the connecting wall 2 serves both as a mountain retaining member and a foundation pile, it is unnecessary to remove the mountain retaining member as in the conventional work. Further, since the earth anchor is not required, it is possible to save a lot of labor. Moreover, the connecting wall 2 is excellent in safety and can be safely operated even under adverse conditions.

Further, since the connecting walls 2 and 2 themselves are used as a base and the connecting walls 2 and 2 are bridged by the horizontal beam 4 made of precast concrete, the productivity is high and the construction period is greatly shortened. be able to.

[0019]

According to the present invention, mountain retaining and foundation construction can be efficiently performed on an inclined surface, and the construction period can be shortened.

Further, the connecting wall is strong and has a high earth retaining ability and is safe even in a site where the soil is bad.

[Brief description of drawings]

FIG. 1 is a sectional view of an initial state of construction showing an embodiment of the present invention.

FIG. 2 is an overall sectional view showing an embodiment of the present invention.

FIG. 3 is a side view showing a connecting portion between a connecting wall and a beam showing an embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a conventional foundation construction method for an inclined surface.

[Fig. 5] Side view of the previous construction period showing a conventional foundation construction method for an inclined surface.

FIG. 6 is a side view of the latter half of the construction showing a conventional foundation construction method for an inclined surface.

[Explanation of symbols]

 1 ... Perforated part, 2 ... Wall, 3 ... Plane part, 4 ... Horizontal beam, 5 ... Basic concrete.

Claims (1)

[Claims] 1. A method for constructing a foundation portion of a building on an inclined surface, comprising: forming a large number of perforations on a straight line substantially along a contour line of the inclined surface and continuing the perforations. To make a groove-shaped cavity,
Concrete is poured into this hollow part to form a connecting wall, and this connecting wall is similarly formed at an appropriate position on the slope, and then the valley side of the connecting wall located between the connecting walls and on the valley side is cut. After fixing a horizontal beam made of precast concrete bridging between the connecting walls at the upper end of the connecting wall projecting from the flat portion, basic concrete is formed so as to cover the upper surfaces of the connecting wall and the horizontal beam. A method of constructing a foundation on an inclined surface, which is characterized by placing