JPS58156620A - Construction work of foundation pile - Google Patents

Abstract

PURPOSE:To construct a pile having a multi-stage spherical footing by a method in which a rubber bag is set with a steel pipe under the ground, and concrete is placed into the bag. CONSTITUTION:A steel pipe 1 whose outside is covered with a rubber bag 2 and the tip is fitted with a shoe 3 is set under soft ground, and while concrete 8 is placed into the steel pipe 1 from a concrete placing pipe 7, the steel pipe 1 is pulled up. In this case, the rubber bag 2 is expanded sideways under the pressure of the concrete 8, and the expansion is stopped at the time when the soil pressure is balanced with the concrete pressure. By this, the places where soil pressure is small of the rubber bag 2 are projectionally expanded into wens form and thereby a pile with a multi-stage spherical footing can be constructed without wasting concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a construction method for foundation piles in soft electric plating.

When penetrating ready-made piles into soft ground, a pile group of 1kg IL-r must be sufficient for resistance to lateral pressure.

Earth concrete piles require a huge number of piles and are ground concrete piles by underground agitation.

A large amount of concrete is expected to be wasted in terms of the amount of concrete used f.

The present invention has been developed in order to eliminate the disadvantages of the conventional construction method, and is to provide a long elastic gas integral I
k- At the same time, the tip of the air envelope is fitted to the tip of the steel pipe column, and the inner front metal fitting and the outer front metal fitting 11 are fitted.
1. After inserting the steel pipe column into the ground to a predetermined depth, the steel pipe column is pulled out while pouring concrete inside the steel pipe column. By neutralizing the plaster metal and leaving it in the ground with the air bag sandwiched between them (
This relates to a foundation pile construction method characterized by placing an air bladder under concrete pressure (thus causing it to swell into the ground).

As described above, the present invention has a structure in which a steel pipe column (a long elastic air bladder body) is fitted, an inner structure in which the tip of the air bladder body is fitted to the tip of the steel tube column, and an outer periphery thereof. In this state, the steel pipe column is penetrated into the ground to a predetermined depth along with the elastic air bag attached to the outside, and then concrete is inserted into the steel pipe column. Since the concrete is poured, the rain sound metal fittings remain at the destination of the shoe metal fittings while holding the elastic air bladder due to the weight of the poured concrete.

By pulling out the steel pipe column while pouring concrete into it, the pressure of the poured concrete (due to the pressure of the poured concrete) causes the air sac to expand and expand in accordance with the properties of the external ground. The surface is covered with an air sac, and the outer ground pressure is
2 lances [Also, multi-stage bulbous concrete piles are constructed.

In this way, according to the fIAvc of this invention, a multi-stage bulbous foundation pile that is crimped to the external ground can be created using a simple wheel load.

A pile frame with sufficient bearing capacity and resistance to lateral pressure of t/11 will be constructed. In addition, the pile structure is a multi-stage bulbous structure that has been expanded and expanded into the ground up to 11 degrees, which is balanced with the shape of Gaimon Tosho.Therefore, there is no waste of concrete used, and the concrete for constructing the pile structure is hardened. The present invention has many advantages, such as being protected by the elastic air sac body fly and not being subject to deterioration due to contamination with underground mud water, earth and sand, etc.

The present invention will now be described with reference to the illustrated example.

(11 is a steel pipe column, and a long rubber bag (21) is installed as an elastic air bag on the outside 1111 of the 7th column, and the tip of the 5th bag 121 is a steel tube column (inner front metal fitting fitted on the tip of 11). (31
In addition, it is clamped by an outer fund (4) disposed on the outside I8.

In the figure (51 is attached to the steel pipe column (1) near the ground surface (a) or the seabed surface. The hard rubber cylinder to be slid on the steel pipe column (1), (61 is connected to the rubber bag (2) with rubber tube.

When concrete is poured, extra air or water is discharged from the steel pipe column (11).

And as mentioned above! Gobukuro Oni 21 is fitted, and the same J
Penetrate the steel pipe column (11) to which the tip of the five bags (21 is clamped with the above-mentioned foot metal fittings (3% (4)) to a predetermined depth in soft ground #(b) (see Figure 1). Next, use it for concrete delivery. Concrete +81 is poured into the steel pipe column (IIK) through the flexible pipe (71).

When the steel pipe column (11) is pulled out, the dead weight of the concrete C8 (thus, the foot metal fittings (3) and (4) remain at the point where the foot metal fittings are reached in the soft ground (-), while the five bags (tsu) are While the concrete 181 was being crushed by the pressure, the same concrete (powder was secured. (See $11,295) The steel pipe column (1) was raised to 1111-m4 (see Figure 5).
The column gradually expands from the bottom to 11 meters, but expands to 11 m+l depending on the nature of the ground outside the column through the five bags.When it reaches a balance with the ground wall pressure, the expansion stops and the steel pipe column (11
When the lifting is completed, multi-stage bulbous piles are constructed in the soft ground. At this time, the mortar (8') leaks from the rubber tube (6), indicating that the electrical work is complete.

(See Figure 4) Concrete) 181's sagging condition and IA bag 12
The expanding state of 1 is determined by the amount of concrete input and the steel pipe column (1
) can be carefully monitored to prevent the rubber bag 121 from bursting.

In addition, since the above-mentioned wheel works are unreinforced concrete piles, in order to perform electrical work on reinforced concrete piles, reinforcing bar cages (
It is recommended to insert 91. Note 1 (I is the top layer of concrete that will be placed when the pile is completed.

The present invention relates to electric work for foundation piles of small-scale structures.

From the bottom of a large caisson during large-scale construction work! ! This applies to the -I type of foundation pile when a pile is required at the bottom.

Although the present invention has been described above with reference to actual examples, the present invention is of course not limited to such actual examples, and various modifications of the design may be made within the scope of departing from the spirit of the present invention. It is something that can be used.

[Brief explanation of the drawing]

Figures 1 to 4 are vertical cross-sectional views showing an example of the foundation pile wheel loading method according to the present invention t14, and Figure 5 is a vertical cross-sectional view showing an actual example of the case where reinforcing bars are used in a cage. It is a front view. (1)...Steel pipe column 12t...Rubber bag (3)
...Inner front hardware (4)...Outer aS doll 18)
... Concrete agent Patent attorney 2 people who are not members of Kaihon Important Cultural Properties

Claims (1)

[Claims] A long elastic air sac is attached to the outside of the steel pipe column, and the tip of the air sac is attached to the tip of the steel pipe column. After inserting the steel pipe column into the ground (to a predetermined depth), the steel pipe column was pulled out while pouring VC concrete inside the steel pipe column, and the above-mentioned twin metal air sac bodies were sandwiched. A foundation pile electric construction method characterized by fixing the same air bladder underground underground and also fixing the same air envelope into the ground by pouring concrete pressure.