JPH02225717A - Landslide protection using foundation pile - Google Patents

Abstract

PURPOSE:To prevent the deformation of a landslide protection wall in case of excavation by providing an extension section extending upward from the last excavation surface to be planned to a foundation pile coming close to the landslide protection wall, and excavating in such a state as the landslide protection wall is supported by the inside thereof. CONSTITUTION:A foundation pile 2 driven by coming close to a landslide protection wall 1 is extended upward from the last excavation surface 3 to be planned, and an extension section 4 is swelled out on the way to provide a projection 5 coming into contact with the internal surface of the landslide protection wall 1. A landslide protection wall timbering is executed to the inside area A of the landslide protection wall 1, and excavation is made while preventing the transformation of the slide protection wall 1 by the foundation pile 2 to cut off the extension section 4 when the erection of the landslide protection wall timbering has been completed. According to the present constitution, the erection of the landslide protection wall timbering is surely carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a heap retaining method when excavating a planned building construction site.

(Problem to be solved by the invention and its features) Foundation piles that support the building load are usually driven prior to excavation of the site where the building is planned to be constructed, but it is important to utilize these foundation piles for retaining piles during excavation. The purpose of the present invention is to provide a new construction method that uses foundation piles to prevent deformation of retaining walls during excavation, and its structural features are within the scope of the claims. 6 In other words, in the present invention, an extension part extending upward from the planned final excavation surface is provided on the foundation pile to be driven close to the retaining wall. Excavation was carried out with the foundation pile supported from the inside, and the foundation pile was used to prevent deformation of the retaining wall during excavation. The extension part of the foundation pile is cut or removed when the erection of the support is completed.7 The present invention can be applied whether the foundation pile is a cast-in-place pile or a ready-made pile; , the extension part is formed by extending a cast-in-place pile or by erecting ready-made timber; in the case of a ready-made pile, the extension part made of ready-made timber is connected in advance to the upper end of the ready-made pile; If it is an extension of a pile, the antibody is partially inflated to form an overhang, and if the extension is made of pre-fabricated material, for example, the overhang material previously attached to the pre-fabricated material is extended from the stored position. Rotate it into position to form an overhang.

(Description of the invention using drawings) The drawing is an explanatory diagram when the foundation pile is a cast-in-place concrete pile, and in the figure, 1 is a retaining wall, 2 is a foundation pile located close to the retaining wall 1, and 2 is a retaining wall. Foundation pile 3 located away from wall l indicates the planned final excavation surface.

In the case of Fig. 1, the foundation pile 2 that is driven close to the retaining wall 1 is extended above the planned final excavation surface 3, and
In addition, a projecting part 5 is provided in the middle of the extension part 4 to bulge out and come into contact with the inner surface of the retaining wall 1.

In this illustrated state, excavation of the inner area A of the retaining wall 1 is started, and while preventing the deformation of the retaining wall 1 with the foundation piles 2, the L[
Next, ordinary heaping shoring is applied, excavation is continued, and when the erection of the heaping shoring is completed, the extension portion 4 is cut and removed.

In the illustrated case, the extension part 4 is provided to the ground surface, but the length of the extension part 4 is arbitrary, and the position and number of the overhang parts 5 may also be selected appropriately. For example, the planned final excavation surface 3
The present invention also includes a case where an extension portion/projection portion is formed directly above the portion.

Figure 2 shows the case where the extension part is formed from ready-made timber 6. In this case, when the foundation pile 2 is driven to the final planned excavation surface 3, it is shown that the extension part is formed in the foundation pile driving casing. Ready-made lumber 6
and built it integrally on top of the foundation pile 2 to form an extension part, and the overhang part is.

After pulling out the foundation pile driving casing, the overhang material 7, which has been rotatably attached in advance to the ready-made lumber 6, is rotated from the storage position to the overhang position shown in the figure using an appropriate means (for example, jacks) to form the overhang material. In this case, the ready-made timber 6 can be reused after being removed.

If the foundation pile 2 is a ready-made pile, although not shown, a ready-made material 6 as shown in FIG. 2 may be connected in advance to the upper end of the foundation pile in a detachable manner.

(Effects of the Invention) The present invention is as described above, in which the retaining wall is temporarily supported by foundation piles driven close to the retaining wall, thereby preventing deformation of the retaining wall during excavation. Therefore, the original pile shoring can be easily and reliably erected, and the safety of excavation work is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the state before excavation starts when the foundation pile is a cast-in-place pile and the extension is cast-in-place. Figure 2 is the same diagram as above when the foundation piles are cast-in-place piles and the extensions are made of ready-made timber. 1 - retaining wall, 2,2°: foundation pile, 3: planned final excavation surface, 4: extension, 5: overhang, 6: ready-made timber, 7: overhang. Patent applicant: Fudo Construction Co., Ltd. Patent attorney: Hiroshi Sometani Figure 1 Figure 2

Claims (1)

[Claims] The foundation pile to be driven close to the retaining wall is provided with an extension extending upward from the planned final excavation surface, and excavation is carried out with the retaining wall supported from inside by the overhang provided on this extension, and the foundation pile is A mountain retaining construction method using foundation piles, characterized in that the piles are used to prevent deformation of the retaining wall during excavation.