JPH0626036A - Concrete pile installation method by inner excavation - Google Patents

Abstract

PURPOSE:To fill soil cement between the inner wall of a drilled hole and the outer wall of a concrete pile, in an inner excavation method. CONSTITUTION:In an inner excavation method, the diameter of a drilled hole is formed larger than the outer diameter of a concrete pile 1, cement milk is mixed in drilled soil so as to generate soil cement 7, and the soil cement is filled between the inner wall of the drilled hole and the outer wall of the concrete pile. Next, foot protection concrete is placed on the bottom of the drilled hole, and the lower end of the concrete pile is inserted and buried in the foot protection concrete 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing a concrete pile in a medium excavation method for the purpose of improving the medium excavation method.

[0002]

2. Description of the Related Art The conventional method of excavating a hole is to excavate a hole having a diameter smaller than the inner diameter of the central hole of the concrete pile, so that the outer diameter of the concrete pile is approximately equal to the diameter of the hole. A friction cutter fixed to the bottom of the concrete pile was used.

[0003]

According to the conventional intermediate excavation method, since the excavation hole is excavated by the friction cutter,
There has been a problem that the wall of the excavation hole is likely to be rough and the frictional supporting force between the inner wall of the excavation hole and the outer wall of the concrete pile cannot be utilized.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, in the medium excavation method, an excavation hole having a diameter larger than that of the concrete pile to be installed is excavated, and soil cement is provided in the gap between the inner wall of the excavation hole and the outer wall of the concrete pile. The above-mentioned conventional problems were solved by adopting a construction method for filling the above.

That is, according to the present invention, in a middle excavation method in which a drilling rod is inserted into a concrete pile and a concrete pile is installed while being drilled, a diameter of the drilling hole is made larger than an outer diameter of the concrete pile. , Knead the excavated soil generated by excavation into the inner wall of the excavation hole, and penetrate the concrete pile. Then, when the drill hole reaches a predetermined depth, cement milk is injected into the excavated soil to generate soil cement, and the soil cement is filled between the inner wall of the drill hole and the outer wall of the concrete pile. After the concrete pile has penetrated, if the drill hole reaches the expected position, stop the concrete pile penetration and proceed with the excavation of the root consolidation section.Inject the cement milk if the excavation of the root consolidation section is completed. This is a concrete pile installation method in the medium excavation method, characterized in that the concrete pile is generated and the concrete pile is penetrated into the concrete to a predetermined depth, and the excavation rod is inserted into the concrete pile. Then, in the medium excavation method in which the concrete pile is pierced and installed while excavating the excavation hole, the excavation hole diameter is set to the concrete With larger drill than the outer diameter of yl, while wearing kneaded excavated soil caused by drilling the inner wall of the borehole, to penetrate the concrete pile. Then, when the drilling hole reaches a predetermined depth, the descending of the concrete pile is stopped, cement milk is injected while only the drilling is proceeding, and when the planned drilling depth is reached in this way, drilling is performed. Continue to inject cement milk to stop, after the rooting near the bottom of the excavation hole over a predetermined depth to generate rooted concrete, extract the excavation rod, then penetrate the concrete pile, of the concrete pile The method for installing a concrete pile in a medium excavation method is characterized in that the penetration of the concrete pile is stopped and the installation is completed when the lower end reaches the middle portion of the concrete. Still another invention is a middle excavation method of inserting an excavating rod in a concrete pile and penetrating and installing a concrete pile while excavating an excavation hole, in which the excavation hole diameter is excavated larger than the outer diameter of the concrete pile, and excavated. By mixing cement milk into the excavated soil produced by to produce soil cement, with the progress of the excavation,
The soil cement is filled between the outer wall of the concrete pile and the inner wall of the excavation hole, and when the excavation hole reaches a predetermined depth, the penetration of the concrete pile is stopped and only the excavation proceeds. When the hole reaches the specified depth, cement milk is injected from the bottom of the hole to push up the excavated soil, and aggregates such as gravel produced by excavation and cement milk are mixed to form root-solid concrete. , A method of installing a concrete pile in a medium excavation method, characterized in that the concrete pile is installed to a predetermined depth in the root-consolidating concrete, and a drilling rod is inserted into the concrete pile to drill a drilling hole. In the middle excavation method where the concrete pile is installed while
The excavation hole diameter is excavated larger than the outer diameter of the concrete pile, cement milk is mixed into excavated soil generated by excavation to generate soil cement, and the soil cement is mixed with the concrete pile as the excavation progresses. The outer wall and the inner wall of the drill hole, and when the drill hole reaches a predetermined depth, after removing the drill rod, insert the drill rod for bottom expansion, Proceed from the bottom end to the bottom to expand the bottom, when the bottom reaches a predetermined depth, inject cement milk from the bottom, remove the excavated soil in the part to generate root-hardening concrete, The method for installing a concrete pile in a medium excavation method is characterized in that the concrete pile is installed by penetrating to a predetermined position after the excavation rod is removed.

The above-mentioned length of soil cement interposed is the total length of the concrete pile. In addition, the length of root consolidation concrete shall be 1 m or more.

In the above description, the fact that the lower end of the concrete pile is at the middle portion of the concrete is that it is not at the top or bottom of the concrete but at the intermediate position.

In the above, if cement milk is injected in the vicinity of the bottom of the drilling hole in the case of producing concrete for consolidation, since the cement milk with high specific gravity pushes up the excavated soil and water with low specific gravity, the consolidation portion is cement. Milk and stone blocks in the excavated soil remain. Then it becomes concrete. However, it does not prevent mixing the cement milk with small aggregates to make concrete. The point is that the objective is achieved when the compressive strength of the root-hardening concrete is, for example, 200 kg / cm ² or more.

[0009]

According to the present invention, since soil cement is interposed between the inner wall of the drill hole and the outer wall of the concrete pile, the supporting force of the outer wall of the concrete pile can be utilized.

Further, since the diameter of the excavation hole is larger than the outer diameter of the concrete pile, the penetration of the concrete pile can be facilitated and the inner wall of the excavation hole can be finished well.

[0011]

Embodiment 1 An embodiment of the present invention will be described with reference to FIGS.

The excavating rod 2 is inserted into the concrete pile 1, and the excavating blade 2 of the excavating rod 2 is projected to the outside of the lower end of the concrete pile 1, and the excavating rod 2 is rotated. The outer diameter of the concrete pile 1 is made larger than that of the concrete pile 1 (for example, about 10 cm), the excavation hole 4 is excavated, and the concrete pile 1 is sequentially lowered as the excavation is performed. In this way, when the penetration of the concrete pile 1 reaches a predetermined depth, the cement milk is poured from the lower end of the excavation rod 2 to excavate. Therefore, the cement milk and the excavated soil are mixed by the rotation of the excavation rod 2,
Soil cement 7 is produced. When the concrete pile 1 is penetrated while generating the soil cement 7 in this way, the sail cement 7 is interposed in the gap between the inner wall of the drill hole 4 and the outer wall of the concrete pile 1, and at the center of the concrete pile 1. The holes 1a are also filled. In the figure, 5 is a spiral blade.

Thus, when the depth of the excavation hole 4 reaches the target depth, the penetration of the concrete pile 1 is stopped and the excavation of only the root consolidation excavation hole 4a is continued. Also in this case, cement milk is poured out to form soil cement, so that the soil cement is successively conveyed upward. In this way, when the rooting excavation hole 4a reaches the predetermined depth, the excavation is stopped (the advance of the excavation rod is stopped), and only the cement milk is poured out. When only the cement milk is poured out, the soil cement near the drilling blade 8 is pushed up sequentially, and becomes only the mixture of cement milk and residual gravel (consolidated concrete). If the amount of cement milk to be injected in this case is measured, it can be seen that the cement milk has filled the root-drilling hole 4a. Then, the excavation rod is pulled out, and then the concrete pile 1 is penetrated until the lower end thereof is consolidated and reaches the middle portion of the excavation hole 4a, whereby the installation of the concrete pile is completed.

In the above-mentioned embodiment, when the drill hole 4 initially reaches a predetermined depth, the cement milk is injected from the tip of the drill rod 2, and the drill is continued, and the concrete pile 1 is moved to the above-mentioned position. It may be excavated by keeping it in place. If the drill hole reaches the planned depth in this way, stopping the advance of the drill rod and pouring only cement milk will cause the cement milk to push up the soil cement near the bottom of the drill hole. Rooted concrete 9 is generated. Thus, when the amount of the root-consolidating concrete 9 reaches a predetermined amount, the excavating rod 2 is rotated in the reverse direction and pulled out,
Take it out of the drill hole. Then, the concrete pile 1 is pressure-penetrated (may rotate), and the concrete pile 1
When the lower end of the concrete reaches the middle portion of the root-consolidating concrete 9, the penetration is stopped and the installation of the concrete pile 1 is completed.

[0015]

[Embodiment 2] In Embodiment 1, the kneading blade 6 is attached to the excavating rod 2 so as to be capable of expanding and contracting. The kneading blade 6 is housed in the concrete pile 1 when not in use, as shown in FIG. Therefore, when the diameter is smaller than the central hole 1a of the concrete pile 1 and comes out of the concrete pile, the concrete pile 1 expands to have the same diameter as the inner diameter of the excavation hole, and the excavated soil or soil cement is kneaded into the excavation hole wall. However, when pulling up the excavation rod 2, the concrete pile 1
Is reduced to such an extent that it can pass through the central hole 1a.

As for the progress of excavation and the method for penetrating the concrete pile 1, the same explanation as in the first embodiment will be omitted.

[0017]

According to the present invention, since the diameter of the excavation hole is made larger than the outer diameter of the concrete pile, the soil cement is surely interposed between the inner wall of the excavation hole and the outer wall of the concrete pile, and the outer friction resistance is sufficiently utilized. There is an effect that can be done.

Further, there is an effect that the penetration of the concrete pile is facilitated and the wall of the excavation hole is corrected so that the concrete pile can always be kept in good condition.

Further, when the kneading blade is used, the hole wall is kept more excellent, and since the excavated soil or soil cement is kneaded under pressure to the hole wall, the hole wall has a large density, Not only is the hole wall kept good, but it also has the effect of improving its consolidation after the concrete pile has penetrated.

[Brief description of drawings]

FIG. 1 is a sectional view of an intermediate portion of excavation in an embodiment of the present invention.

FIG. 2 is a sectional view of the concrete pile penetration installation.

FIG. 3 is a cross-sectional view of a case where a kneading blade is also housed.

FIG. 4 is a cross-sectional view of the same kneading blade in use.

[Explanation of symbols]

 1 Concrete pile 2 Drilling rod 3 Rod main body 4 Drilling hole 5 Spiral blade 6 Mixing blade 7 Soil cement 8 Drilling blade

Claims (4)

[Claims] 1. A medium excavation method in which a drilling rod is inserted into a concrete pile, and a concrete pile is inserted and installed while excavating a drilling hole, and the diameter of the drilling hole is drilled larger than the outer diameter of the concrete pile, and the drilling is performed. The concrete pile is penetrated while kneading the excavated soil generated by the method into the inner wall of the excavation hole. Then, when the drill hole reaches a predetermined depth, cement milk is injected into the excavated soil to generate soil cement, and the soil cement is filled between the inner wall of the drill hole and the outer wall of the concrete pile. After the concrete pile has penetrated, if the drill hole reaches the expected position, stop the concrete pile penetration and proceed with the excavation of the root consolidation section.Inject the cement milk if the excavation of the root consolidation section is completed. A concrete pile installation method in a medium excavation method, characterized in that the concrete pile is formed into a concrete concrete, and the concrete pile is penetrated into the concrete to a predetermined depth. 2. In a middle excavation method in which a drilling rod is inserted into a concrete pile, and the concrete pile is inserted and installed while excavating a drilling hole, the drilling hole diameter is made larger than the outer diameter of the concrete pile, and the drilling is performed. The concrete pile is penetrated while kneading the excavated soil generated by the method into the inner wall of the excavation hole. Then, when the drilling hole reaches a predetermined depth, the descending of the concrete pile is stopped, cement milk is injected while only the drilling is proceeding, and when the planned drilling depth is reached in this way, drilling is performed. Continue to inject cement milk to stop, after the rooting near the bottom of the excavation hole over a predetermined depth to generate rooted concrete, extract the excavation rod, then penetrate the concrete pile, of the concrete pile A method for installing a concrete pile in a medium excavation method, characterized in that the penetration of the concrete pile is stopped and the installation is completed when the lower end reaches an intermediate portion of the concrete. 3. A middle excavation method in which a drilling rod is inserted into a concrete pile and a concrete pile is inserted and installed while excavating a drilling hole, the diameter of the drilling hole is made larger than the outer diameter of the concrete pile, and the drilling is performed. By mixing cement milk in the excavated soil generated by to produce soil cement, as the excavation progresses, the soil cement is filled between the outer wall of the concrete pile and the inner wall of the excavation hole, When the depth reaches the planned depth, the concrete pile is stopped from penetrating and only the excavation proceeds, and when this drill hole reaches the predetermined depth, cement milk is injected from near the bottom of the drill hole to excavate the soil. While pushing up, aggregates such as gravel produced by excavation and cement milk are mixed to produce root-hardening concrete, and A method for installing concrete piles in a medium excavation method, which is characterized in that the concrete piles are installed at a predetermined depth. 4. A medium excavation method in which a drilling rod is inserted into a concrete pile, and a concrete pile is inserted and installed while excavating a drilling hole, and the diameter of the drilling hole is made larger than the outer diameter of the concrete pile, and the drilling is performed. By mixing cement milk in the excavated soil generated by to produce soil cement, as the excavation progresses, the soil cement is filled between the outer wall of the concrete pile and the inner wall of the excavation hole, When the drilling rod reaches the planned depth, the drilling rod is pulled out, the drilling rod for expanding the bottom is inserted, and the bottom expanding drilling proceeds from the vicinity of the lower end of the drill hole by the above, and the bottom expanding part reaches the predetermined depth. When it reaches, the cement milk is injected from the bottom to remove the excavated soil in the part to produce root-consolidated concrete, and after the excavated rod is removed, the A method for installing a concrete pile in a medium excavation method, characterized in that the concrete pile is installed to a predetermined position.