JPH0458849B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for constructing piles, and in particular to quick and easy joining of pile heads.

[Prior Art] Fig. 13 is a process diagram showing a conventional pile construction method using soil cement, etc. In this soil cement method, for example, the ground 1 is excavated with an auger 2 as shown in Fig. 13a. A soil-cement column 4 is created by injecting a ground fixing liquid such as cement milk while drilling the hole, and forcibly stirring the cement milk and the earth and sand in the hole with a stirring blade 3. When the soil cement column 4 is built to a predetermined depth as shown in Figure 13b, the auger 2 is pulled out and
As shown in FIG. 2, a structure consisting of a hollow cylinder with an open end, for example, a steel pipe pile 5, is built into an unhardened soil cement column 4. After this steel pipe pile 5 is built up to the support layer 6 as shown in FIG. 13d, the soil cement column 4 is allowed to harden to complete a pile body in which the soil cement column 4 and the steel pipe pile 5 are integrated.

After that, the soil cement etc. that had accumulated inside the pile head of the steel pipe pile 5 was removed and cleaned, and then the 14th
As shown in the figure, a reinforcing bar cage 7 is inserted into the pile head of a steel pipe pile 5, concrete 8 is placed, and it is connected to a footing.

[Problems to be Solved by the Invention] In the conventional pile construction method described above, the inside of the pile head of the steel pipe pile 5 is clogged with mud, soil, or soil cement during construction. The pile and the footing etc. could not be joined until after removing mud, soil, soil cement, etc. from the inside of the pile head of the pile 5 and cleaning it.
It is not easy to remove soil cement and the like from the inside of the pile head and clean it, and there is a problem that the pile head cannot be constructed quickly because a large number of piles must be disposed of.

The present invention was made to solve these problems, and it is an object of the present invention to propose a method for constructing a pile that can easily and quickly construct a pile head.

[Means for Solving the Problems] The method for constructing a pile according to the present invention includes attaching an inner cover having an air vent inside the head tip of a structure consisting of a hollow cylinder with an opening in advance, and then attaching the inner cover. The pile body is completed by erecting the constructed structure into the soil cement column body.

[Function] In this invention, the inner cover with the air vent installed inside the tip of the head of the structure makes it easy to vent air from the hollow part when the structure is built into the soil cement column, and the soil cement This prevents water from flowing into the pile cap of the structure.

[Embodiment] FIG. 1 is a sectional view showing a steel pipe pile 5 according to an embodiment of the present invention, and the pile head of the steel pipe pile 5 is provided with an inner cover 9 at a predetermined distance from the tip of the pile head. Fixed. As shown in FIG. 2, this inner lid 9 is provided with a plurality of air vent holes 10 of a size that allows air to pass through but not soil cement in the form of slurry.

Pile construction using the steel pipe pile 5 configured as described above will be explained based on the process diagram of FIG. 3.

First, while drilling a hole in the ground 1 with an auger or the like, a ground fixing liquid such as cement milk is injected into the ground 1 and stirred to form a soil cement column 4 to a predetermined depth as shown in FIG. 3a. Next, as shown in FIG. 3b, before the soil cement column 4 hardens, the inner cover 9 is
A steel pipe pile 5 having a diameter is press-fitted into the soil cement column 4. When press-fitting the steel pipe pile 5, the hollow part of the steel pipe pile 5 is filled with soil cement from the lower end opening, but since the air in the hollow part escapes through the air vent hole 10 of the inner cover 9, the steel pipe pile 5 can be inserted without any extra resistance. The piles 5 can be press-fitted into the soil cement columns 4. When the steel pipe pile 5 reaches a predetermined depth, the soil cement is filled up to the bottom surface of the inner cover 9 as shown in FIG. Since the size is such that it cannot pass through, soil cement is prevented from flowing into the pile head of the steel pipe pile 5, as shown in FIG.
After the steel pipe pile 5 is erected, the soil cement column 4 is allowed to harden to complete a pile body in which the soil cement column 4 and the steel pipe pile 5 are integrated.

After that, the completed piles are joined to footings or foundation beams, etc. During this joining, the steel pipe pile 5
No soil cement has flowed into the pile head and the inside surface is not contaminated, so cleaning is not necessary.

In addition, in the above embodiment, the air vent hole 10
Although the case where the steel pipe pile 5 to which the inner cover 9 having a plurality of air vent valves 11 is fixed is used is used, as shown in FIG. It is possible to have a powerful effect.

The air vent valve 11 consists of a valve seat 13 and a float 14, which are attached to both ends of a shaft 12 with nuts 15, and the valve seat 13 is in contact with a spacer 16 provided at a predetermined interval above the central opening of the inner lid 9a. There is.
When the steel pipe pile 5 is press-fitted into the soil cement column 4 in this state as shown in FIG. 6, the air in the hollow part of the steel pipe pile 5 flows out from between the valve seat 13 and the spacer 16. Further, when the steel pipe pile 5 is press-fitted and the soil cement and the float 14 come into contact with each other, the air vent valve 11 is pushed up, closing the central opening of the interior 9a, and the seventh
As shown in the figure, soil cement is prevented from flowing into the pile head of the steel pipe pile 5.

Alternatively, as shown in the cross-sectional view of FIG. 8 and the plan view of FIG. 9, a steel pipe pile 5 may be used to which an inner cover 9b having a plurality of small-diameter pipes 17 attached to the top is fixed. That is, the steel pipe pile 5 is press-fitted into the soil cement column 4, and when it reaches a predetermined depth, the soil cement flows into the pipe 17 as shown in FIG.
Flow into other pile heads is prevented. In this case, the pipe 17 can also be used as a reinforcing bar for joining footings and the like.

Furthermore, an inner cover 9c is provided with a flexible water-impermeable bag 19 having a circular steel plate 18 with a diameter slightly smaller than the inner diameter of the steel pipe pile 5 at the bottom as shown in FIG.
The inner cover 9c is placed on the stopper 20 fixed to the inner wall of the steel pipe pile 5 as shown in FIG. The steel pipe pile 5 is press-fitted into the soil cement column 4 while removing the air from the hollow part. When the steel pipe pile 5 is press-fitted and the bottom of the bag 19 reaches the upper end of the soil cement column 4, water or the like is injected into the bag 19, and the soil cement and water are balanced by the water head difference to form a soil cement pile. The steel pipe pile 5 is press-fitted to a predetermined depth while preventing the inflow into the head. After the soil cement has hardened, the inner cover 9c is removed and the pile cap is treated.

In each of the above embodiments, the case where steel pipe piles are used has been described, but even when other structures such as ready-made piles are used, the same effect as in each of the above embodiments can be achieved.

[Effects of the Invention] As explained above, in this invention, a structure in which an inner cover having an air vent is attached to a hollow part inside the tip of the head is built into a soil cement column, so that the hollow part of the structure is This makes it easy to remove air from the pile head and prevents soil cement from flowing into the pile head of the structure, making it possible to omit the work of removing soil cement from the pile head.

Additionally, since the inside surface of the pile head is not contaminated, there is no need to clean it, making it possible to quickly connect the pile to footings or foundation beams, etc., and to place good quality concrete on the pile head when processing the pile head. It also has the effect of

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a steel pipe pile according to an embodiment of the present invention, Fig. 2 is a plan view showing the inner cover of the steel pipe pile shown in Fig. 1, and Figs. FIG. 4 is a sectional view showing the pile head formed by the above embodiment, FIG. 5 is a sectional view showing the pile head of the steel pipe pile according to the second embodiment of the present invention, and FIG. figure,
Fig. 7 is an explanatory diagram of the operation of the embodiment shown in Fig. 5, Fig. 8 and Fig. 9 show a steel pipe pile according to a third embodiment of the present invention, and Fig. 8 shows the pile head. 9 is a plan view, FIG. 10 is an explanatory diagram of the operation of the embodiment shown in FIG. 8, and FIG. 11 is a fourth embodiment of the present invention.
FIG. 12 is a side view showing the inner lid according to the embodiment shown in FIG. 11, and FIG. 13 a
-d are process diagrams showing a conventional example, and FIG. 14 is an explanatory diagram showing pile cap treatment. 1...Ground, 4...Soil cement column, 5...
...Steel pipe pile, 9, 9a, 9b, 9c...Inner cover.

Claims (1)

[Claims] 1. A soil cement column is created in the ground, and before the soil cement column hardens, a structure consisting of a hollow cylinder with an opening at the tip is built inside the column, and the structure is created by hardening the soil cement column. In the construction method in which the pile body is constructed by integrating the pile body and the soil cement column, an inner cover with an air vent is installed in the hollow part inside the head tip of the above structure in advance, and the structure with the inner cover attached is A pile construction method characterized by completing the pile body by erecting it in a soil cement column body.