JPS62233331A - Placement of concrete underground - Google Patents

Abstract

PURPOSE:To perform construction work simply and effectively without disturbing a current situation of ground by a method in which a bag attached with a rigid material along its edge is penetrated into the ground by applying a force using the rigid material as a supporting point, and concrete is packed into the bag. CONSTITUTION:An annular rigid material 3 s fixed to the upper and lower ends of a cylindrical bag 1 made of a two-layered (surface and back) woven fabric 2, and a concrete-charging port 4 is provided to the upper end of the bag 1. A space-regulating rope 5 is also provided in the surface and back woven fabrics 2. A downward force is applied by a vibro-hammer, etc., to the rigid material 3 on the lower end of the bag 1 to penetrate the bag 1 into the ground. Concrete slurry is then charged into the bag 1 through the charging port 4 and hardened to form a hollow pile.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for placing underground concrete such as piles and underground walls made of concrete, mortar, etc.

[Purpose of the invention]

The purpose of this invention is to propose a method of placing underground concrete such as concrete piles and underground walls efficiently using simple means without disturbing the existing ground.

[Structure of the invention]

This method of placing concrete underground is characterized in that a bag body with a rigid material fixed along its edge is pressed into the ground by applying force using the rigid material as a fulcrum, and concrete is filled into the bag body. .

This will be explained below with reference to the illustrated embodiments.

Fig. 1 shows a bag 1 used in this casting method, which is a cylindrical bag made of two layers of fabric 2.2 on the front and back, and a circular ring-shaped rigid material 3. It's fixed. In addition, at the upper end of the bag body 1 there is a concrete inlet 4 and a fabric 2 on the front and back sides.
, and a spacing adjustment string 5 is attached between the two.

The bag 1 is press-fitted into the ground by applying downward force to the rigid member 3 at the lower end using a vibrohammer or the like, or by using a water jet or the like in combination, as shown in Figure 2. Bag body 1
is led by the rigid members 3 and drawn into the ground, and is stretched vertically between the rigid members 3 and 3 at the upper and lower ends. Subsequently, as shown in Figure 5, concrete slurry is filled into the bag 1 through the input port 4 at the upper end. Concrete 6 is bag body 1
It hardens inside to form a hollow pile.

Figure 'A-4 also shows the bag 1 used in this casting method, and is a rectangular mat-like bag made of two layers of fabric 2 on the front and back, with rod-shaped rigid materials 3°3 along the upper and lower edges. The input port 4 is attached to the upper end, and a spacing adjustment string 5 is attached between the two layers of fabric 2.

This bag 1 is also press-fitted into the ground by applying downward force to the rigid material 3 at the lower end, and the bag 1 is expanded between the rigid members 3 at the upper and lower ends, filled with concrete, and made into a flat vertical structure. can form underground walls.

The bags used in this casting method are woven fabrics such as synthetic fiber fabrics,
Alternatively, the material may be an impermeable sheet such as waterproof cloth.

Conventionally, a rigid material can be fixed to a bag body known as a cloth formwork. In addition, bags made of water-impermeable sheets are suitable for areas where there is a lot of groundwater.

Rigid materials include metals such as steel and aluminum 1 synthetic resin, FR
The bag must be made of a highly rigid material such as P, and be able to withstand the forces of earth pressure, concrete pressure, etc. during or after press-fitting into the ground, and maintain the shape of the edge of the bag. It can be made into various shapes other than annular and rod shapes.

[Effect of total glq]

This pouring method consists of the above configuration. In this method, the bag is pressed into the ground with a rigid material as the lead, expanded, and then filled with concrete, so there is no need to dig up the ground and it does not disturb the ground. The rigid material maintains the exact shape and expansion position of the bag underground, enabling highly accurate concrete placement. In addition, the rigid material facilitates press-fitting of the bag, contributing to improved workability and reduced construction costs.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Figure 1 is a perspective view of an annular bag, Figure 2 is a side view of the bag in Figure 1, which is press-fitted into the ground, and Figure 3 is a side view of the bag in the state of being press-fitted into the ground. Vertical cross-sectional view of a hollow pile formed by filling concrete into a bag expanded into the ground.
Figure 4 is a plan view of the mat-like bag body. 1... Bag body, 2... Fabric, 3...
... Rigid material, 4 ... Input port, 5 ... Spacing adjustment string, 6 ... Concrete. Figure 1 Figure 2 Figure 4 Figure 3

Claims (1)

[Claims] (1) Placement of underground concrete, which is characterized in that a bag body with a rigid material fixed along the edge is pressed into the ground by applying force using the rigid material as a fulcrum, and concrete is filled into the bag body. Method.