JPS6054456B2 - How to install piles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for installing piles made of tubular bodies below the ground surface.

The head of the foundation shaft that supports the structure is located below the ground surface.

Conventionally, such piles have been installed by the following method in which the piles are driven into the ground by hammering. In other words, if the head of the pile is installed at a relatively shallow position from the ground surface, the pile should be driven into the ground to the extent that the head of the pile slightly protrudes from the ground surface, and then the ground around the pile should be excavated. This is then done by cutting the pile at a predetermined location below the ground surface and removing the upper portion from that location.

In addition, for structures with basements, etc., the piles that support them need to be installed so that their heads are located below the floor of the basement.

In this case, after the pile is driven into the ground in the same manner as described above, a so-called ``gut'' is placed on the head of the pillow, and by applying a striking force to this ``gut'', the pile can be driven further into the ground. This is done by letting the head of the pile reach a predetermined position deep below the ground surface. However, in any of the above methods, the pile is driven into the ground with a large impact force, so in addition to having the originally required strength as a J resistance, the pile must withstand the impact force. It is necessary that the structure is such that it can be obtained. Therefore, the pile material becomes expensive, and in the former method, the portion removed by cutting the pile is not used, resulting in loss of the pile material. 7 Furthermore, the noise and vibration generated by pile impact is one of the causes of pollution problems, especially in urban areas.

The latter method is a method of forming piles underground by inserting a pile made of a tubular body into a hole filled with a stabilizing liquid, as disclosed in Japanese Patent Publication No. 55-5013. When applied, there is a problem that the stabilizing liquid flows into the interior of the tubular body from the upper end of the tubular body.

The presence of a stabilizing liquid inside the tubular body allows the movement of the plumbstone to be controlled when the plumbstone is moved up and down along its length within the tubular body, thereby consolidating the bottom of the hole below the tubular body. It becomes a hindrance. Further, in order to place mortar or concrete inside the tubular body, it is necessary to remove the stabilizing liquid from the inside of the tubular body. Therefore, the object of the present invention is to
The purpose of this is to install a pile into the ground without using any impact force so that its head is located at a predetermined point below the ground surface, and in particular to install a pile from a tubular body into a hole filled with a stabilizing liquid. The objective is to form a pile in the ground while preventing the stabilizing liquid from flowing into the tubular body when the pile is inserted.

The method of the present invention involves drilling a hole in the ground with a depth exceeding the length of the pile while filling it with a stabilizing liquid, and then installing a pipe member with both ends open in the hole in a liquid-tight manner at the upper end of the pile. Insert
It consists of filling the gap between the wall of the hole and the pile with solid matter and then removing the tube member.

The features of the invention will become clearer from the following description of the illustrated embodiment.

First, as shown in FIG. 1, a tubular body 10. A hole 12 with a depth exceeding the length of the pile consisting of is excavated while being filled with stabilizing liquid.

The depth of the hole 12 is determined by the position of the pile head below the ground surface, that is, the set distance between the ground surface and the pile head. In the illustrated example, the depth of the hole 12 is the sum of the set distance value a and the length b of the stake, that is, the tubular body 10. Next, as shown in FIG. 2, the tubular body 10, in which the tubular member 14 with both ends open is fluid-tightly attached to the upper end, is inserted into the hole 10 filled with the stabilizing liquid.
Insert inside.

The tubular body can be inserted into the hole 12 by hanging a wire 16 connected to a winch (not shown) on the tube member 14, lifting the tubular body 10, and lowering it into the hole 12. . As a result, the upper end of the tubular body 10 is placed at a predetermined position below the ground surface without applying any impact force to the tubular member 14 and without any stabilizing liquid flowing into the tubular body 10. As shown in FIG.
and the pipe member 14 are connected to the bolt 20 via the backing 18.
and are separably joined by a nut 22. The pipe member 14 is made of a steel pipe, and the steel pipe is provided with flange portions 24 and 26 extending inwardly over the entire circumference at both ends thereof, and a plurality of bolt holes 28 and 30 are provided in the flange portion. . The tubular body 10 is made of a concrete pipe, and the upper end thereof has flange portions 24, 26 of the pipe member 14.
A copper-iron cap 34 is attached which has a plurality of female threaded holes 32 facing the bolt holes 28 and 30 provided therein. The backing 18 has bolt holes 30
A hole 36 is bored opposite to. The bolt 20 has threaded portions at both ends, one end of which is inserted into the bolt hole 28,
30 and a hole 36, and is screwed into the female threaded hole 32, and the other end is screwed into the nut 22 on the upper surface of the flange portion 24. Therefore, by tightening or loosening the nut 22, the tube member 14 can be easily attached to and detached from the tubular body 10.

Further, the bolt 20 can be separated from the tubular body 10 by unscrewing it from the female threaded hole 32. In addition, in order to reinforce the flange portions 24 and 26, the pipe member 1
Ribs 38 and 40 are welded in contact with both the inner wall surface of 4 and the flange portions 24 and 26.

FIG. 7 shows an example in which the tubular body 10 and the tube member 14 are joined by welding.

The lower end of a tubular member 14 made of a steel pipe with both ends open is welded along its periphery to a cap 34 provided at the upper end of the tubular body 10 made of a concrete pipe. This ensures watertightness at the joint between the tubular body 10 and the tube member 14. Moreover, the pipe member 14 can be replaced with a concrete pipe instead of the steel pipe. In this case, a cap similar to that of the tubular body 10 is attached to the end of the concrete pipe and welded. At the upper end of the tubular body 10,
By attaching the tube member 14 as in the above embodiment, the stabilizing liquid will not flow from the joint between the tube member 10 and the tube member 14, that is, from the upper end of the tube member 10.

Therefore, for example, after inserting the tubular body 10 into the hole 12, a shoe block (not shown) disposed below the tubular body 10 is placed under a heavy weight inside the tubular body 10 in order to consolidate the bottom ground of the hole. Even when the weight is dropped and penetrates the ground, the falling movement of the weight is not inhibited by the stabilizing liquid. Furthermore, even when pouring mortar or concrete into the tubular body 10 inserted into the hole 12, there is no need to drain the stabilizing liquid inside the tubular body 10 before starting the work. Moreover, since no impact force is applied to the tube member 14, the cross-sectional shape of the tube member 14 can be made strong enough to withstand lifting of the tubular body 10.

Therefore, it is possible to save the material of the tube member 14. Next, after the insertion of the tubular body 10 into the hole 12 is completed, the wall of the hole 12 and the tubular body 10 and, if necessary, the tube member 1
Fill the gap between 4 and 4 with solid matter.

The gap can be filled with the solid material by adding a solidifying agent to the stabilizing liquid and solidifying it, or by replacing the stabilizing liquid with earth and sand, mortar, concrete, etc. After that, the ground around the pipe member 14 is excavated,
Remove the pipe members.

In this case, according to the example shown in FIG. 3, the bolts 20 and nuts 22 connecting the tubular body 10 and the pipe member 14 can be removed at the ground surface even before the ground is excavated. Removal is possible. In the example shown in FIG. 7, the pipe member 14 is melted or demolished and removed.
In the former example, the removed tubular member 14 can be further used for another tubular body. According to the present invention, it is possible to economically install a pile with the head located at a predetermined location below the ground surface without requiring any impact force.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a hole drilled underground, Figure 2 is a vertical cross-sectional view showing the state in which a pile is inserted into the hole, and Figure 3 is a vertical cross-sectional view of a hole drilled into the ground.
4 is a plan view of the pile shown in FIG. 3; FIG. 5 is a cross-sectional view taken along line 1-1 in FIG. 3; FIG. 3 is a cross-sectional view taken along the line ■--■ in FIG. 3, and FIG. 7 is a partial cross-sectional view of the bore, the tubular body, and the tube member. 10... Tubular body, 12... Hole, 14.
... Pipe member, 18 ... Backing, 20
...Bolt, 22...Nut, 24,2
6...Flange part, 28, 30...Bolt hole, 32...Female screw hole, 34...Cap.

Claims (1)

[Claims] 1. A method of installing a pile made of a tubular body under the ground surface, which involves drilling a hole in the ground with a depth exceeding the length of the pile while filling it with a stabilizing liquid, and then opening it at both ends. Inserting a tubular body with a tubular member liquid-tightly attached to the upper end into the hole, and removing the tubular member after filling the gap between the wall of the hole and the pile with a solid substance. A method of installing piles, consisting of: 2. The method according to claim 1, wherein the tube member and the tubular body are separably joined via a packing. 3. The pipe member is made of a steel pipe, the steel pipe is provided with a flange portion having a plurality of bolt holes extending inwardly over the entire circumference at both ends thereof, and the tubular body is made of a concrete pipe, has a steel cap attached to its upper end and having a plurality of female screw holes provided opposite to the bolt holes, and the pipe member and the tubular body are connected by bolts and nuts. The method according to claim 1 or 2, wherein 4. The method according to claim 1, wherein the tube member and the tubular body are joined by welding.