JP2014005600A - Joint method for upper structure and ground improvement pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the joint method of an upper structure and a ground improved pile for including a crushed stone layer between the upper surface of a ground improved pile and an upper structure with a geotextile to form a sandbag-shaped crushed stone layer, and for preventing the breakdown of the crushed stone layer.SOLUTION: In the joint method of an upper structure and a ground improved pile, a crushed stone layer 3 between an upper surface 2A of a ground improved pile 2 and an upper structure 4 is included with a geotextile to form a sandbag-shaped crushed stone layer 3.

Description

  The present invention relates to a method for joining an upper structure and a ground improvement pile using geotextile sandbags.

  Conventionally, as shown in FIG. 6, the ground improvement pile 101 is constructed in the embankment 100 and the crushed stone layer 102 is laid on the top of the ground improvement pile 101 as shown in FIG. On top of that, an upper structure (concrete roadbed) 103 was constructed (see Patent Document 1 below).

JP 2011-202427 A

  However, in this pile slab type embankment, since the crushed stone layer 102 is directly provided between the top end of the ground improvement pile 101 and the upper structure 103, as shown to FIG. 7 (a), (b), (c). In addition, when the upper structure 103 is a concrete roadbed, repeated vertical loads due to trains, etc. are applied over time, or the embankment and soft ground around the ground improvement pile 101 are subsided due to an earthquake. There was a problem that the crushed stone layer 102 collapsed and the deformation of the upper structure 103 (for example, settlement 103A) occurred, such as spillage of the crushed stone 102A of the crushed stone layer 102.

  Moreover, as shown in FIG. 8, when the ground improvement pile 101 is combined with the upper structure 103, or when the upper structure 103 is directly constructed on the ground improvement pile 101, the upper part at the time of the earthquake There is a concern about the damage of the ground improvement pile 101 due to the horizontal force of the structure 103, and there is a joint structure between the ground improvement pile 101 and the upper structure that prevents the horizontal force from acting as much as possible while maintaining the vertical force on the upper structure 103. It is desired.

  In view of the above situation, in the present invention, in the joining method of the upper structure and the ground improvement pile, the crushed stone layer between the top edge of the ground improvement pile and the upper structure is covered with geotextile, and the crushed stone layer is formed into a sandbag shape. The purpose is to provide a method of joining the superstructure and the ground improvement pile that prevents the collapse of the ground.

In order to achieve the above object, the present invention provides
[1] In the method of joining the superstructure and the ground improvement pile, the crushed stone layer between the top of the ground improvement pile and the superstructure is covered with geotextiles to form a crust-shaped crushed stone layer.
[2] In the method of joining the superstructure and the ground improvement pile described in [1] above, the construction of the crust-shaped crushed stone layer is performed by laying geotextiles on top of the ground improvement piles at right angles, and laying this geotextile Install a sandbag on top, fold back the end of this geotextile, bind this geotextile corner together, fix the top of this geotextile, and place the roadbed concrete directly on the top of this geotextile Features.

  [3] In the joining method of the upper structure and the ground improvement pile described in [1] or [2], the upper structure is a concrete roadbed.

According to the present invention, the following effects can be achieved.
(1) The crushed stone layer between the top edge of the ground improvement pile and the upper structure is covered with geotextiles to form a sandbag, thereby preventing the crushed stone layer from collapsing.
(2) The crushed stone layer between the top edge of the ground improvement pile and the upper structure is covered with geotextile, and by making a sandbag shape, the vertical force is maintained against the upper structure, and the horizontal force is applied to the improved pile. Reduce transmission.

It is sectional drawing which shows the geotextile padding process of the top edge of the ground improvement pile which shows the Example of this invention. It is an AA top view of FIG. It is an expanded view of the geotextile used for the geotextile sandbag which concerns on this invention. It is an assembly drawing of the geotextile sandbag according to the present invention. It is a schematic diagram which shows the mode of the reduction of the influence on the ground improvement pile of the inertia force at the time of an earthquake by the geotextile sandbag of this invention. It is a schematic diagram of the ground improvement pile head of the conventional pile slab type embankment. It is a schematic diagram which shows the deformation | transformation state of the ground improvement pile head of the conventional pile slab type embankment. It is a schematic diagram which shows the mode of the influence of the inertia force at the time of earthquake of the ground improvement pile head of the conventional pile slab type embankment on the ground improvement pile.

  In the method of joining the upper structure and the ground improvement pile according to the present invention, the crushed stone layer between the top edge of the ground improved pile and the upper structure is covered with geotextile to form a crust-like crushed stone layer.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a cross-sectional view showing a geotextile capping process at the top of a ground improvement pile according to an embodiment of the present invention, and FIG. 2 is a plan view taken along the line AA in FIG.
As shown in these figures, a ground-improved pile 2 is constructed in the embankment 1, and a crust-shaped crushed stone layer covered with geotextile that holds the upper structure (concrete roadbed) 4 by the top end 2 </ b> A of the ground-improved pile 2. (Geotextile dough) 3 is constructed.

In this way, the collapse of the crushed stone layer is prevented by constructing the geotextile pad 3 on the top end 2A of the ground improvement pile 2, which is a place where the upper structure is likely to be affected by the collapse of the crushed stone layer.
Hereinafter, the construction method of the crust-shaped crushed stone layer included in the geotextile will be described.

FIG. 3 is a development view of a geotextile used for the geotextile sandbag according to the present invention, and FIG. 4 is an assembly view of the geotextile sandbag.
(1) Geotextile installation The geotextile is cut into the shape shown in FIG. 3, and as shown in FIG. 4 (a), the geotextile 11 (member for earthwork) is laid on top of the ground improvement pile at a right angle.
(2) Installation of sandbags As shown in FIG. 4B, a sandbag (RRR sandbag) 12 is installed on the laid geotextile 11.
(3) Geotextile folding end processing As shown in FIG. 4C, the end of the geotextile 11 is folded and the corners are bound. Specifically, binding is performed by the binding band 13.
(4) Geotextile top end fixing As shown in FIG. 4 (d), the geotextile 11 top end surface is fixed with a temporary fixing pin 14 and a temporary fixing band 15, and is constructed as a geotextile sandbag 16.
(5) Placement of roadbed concrete Placement of roadbed concrete directly at the top of the geotextile.

In addition, a shape and a manufacturing method are not limited to this. The size of the geotextile sandbag is approximately the same as the area of the ground improvement pile as shown in FIGS.
FIG. 5 is a schematic view showing a state of reducing the influence of the inertial force at the time of earthquake on the ground improvement pile by the geotextile sandbag of the present invention.
In FIG. 5, the ground improvement pile 2 is constructed in the embankment 1, and the ground improvement pile 2 holds the upper structure (concrete roadbed) 4, and the crust-like crushed stone layer 3 included in the geotextile of the present invention is constructed. Like to do. According to the present invention, the crushed stone layer 102 at the top of the ground improvement pile 101 collapses due to the settlement of the embankment / soft ground around the ground improvement pile 101 at the time of the earthquake as shown in FIG. It is possible to reduce the problem of occurrence of deformation (such as settlement). Moreover, as shown in FIG. 8, when the ground improvement pile 101 is combined with the upper structure 103, or when the upper structure 103 is constructed directly on the ground improvement pile 101, the upper structure at the time of an earthquake. Although the horizontal force of 103 is also applied to the pile head, the pile head horizontal force is reduced by the inclusion of crushed stone by geotextile, so that the ground improvement pile 101 is not damaged.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The method of joining the superstructure and the ground improvement pile of the present invention is to include a crushed stone layer between the top of the ground improvement pile and the superstructure by geotextile, and prevent the collapse of the crushed stone layer by making it a sandbag shape. It can be used as a method for joining structures and ground improvement piles.

1 Embankment 2 Soil Improvement Pile 2A Top of Soil Improvement Pile 3,16 Soil-shaped crushed stone layer covered with geotextile (Geotextile Soil)
4 Superstructure (concrete roadbed)
11 Geotextiles 12 Dougou (Dors for RRR)
13 Bonding band 14 Temporary fastening pin 15 Temporary fastening band

Claims (3)

  A method of joining the upper structure and the ground improvement pile, characterized in that the crushed stone layer between the top of the ground improvement pile and the upper structure is covered with geotextiles to form a crust-like crushed stone layer.   In the joining method of the superstructure and the ground improvement pile according to claim 1, the construction of the crust-shaped crushed stone layer is performed by laying a geotextile on the upper part of the ground improvement pile at a right angle, and placing a sandbag on the laid geotextile. The upper part characterized in that it is installed by folding the end of the geotextile, bundling the corners of the geotextile, fixing the top of the geotextile, and placing the roadbed concrete directly on the top of the geotextile Method of joining structure and ground improvement pile.   The method of joining an upper structure and a ground improvement pile according to claim 1 or 2, wherein the upper structure is a concrete roadbed.