JPH05106222A - Embedding method for wooden pile - Google Patents

Abstract

PURPOSE:To use a wooden pile practically without requiring foundation deeper than required and without generating environmental pollution. CONSTITUTION:Excavated earth and solidifying material are agitated to be mixed with each other, and in ground, a concreting body S is formed, and after that, in the concreting body S before hardened, a wooden pile P is driven, or an excavated hole H is filled up with fixed solution 7 containing the solidifying material, and after that, in the fixed solution 7 before hardened, the wooden pile P is driven to be embedded in the excavated hole H. By setting the wooden pile P in a state that it is covered with the concreting body S and the fixed solution 7, the wooden pile P is used effectively and practically without need for constructing a foundation deeper than required, and without relying on antiseptics and anticorrosives, and without bring controlled by the depth of an underground water position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for burying wooden piles, which enables the wooden piles to be used above the normal water level.

[0002]

BACKGROUND OF THE INVENTION Wooden piles are now used less frequently due to depletion of wood resources and the spread of concrete piles, but they are easy to handle and low in cost. Because of its advantages, it is still used in pile foundations for residential-scale buildings that do not require large bearing capacity.

When the wooden pile is buried above the groundwater level, it easily decays due to the generation of bacteria and microorganisms and loses its bearing capacity, so the applicable depth is specified below the normal water level.

However, since the groundwater level fluctuates due to changes in the environment, it is necessary to deeply locate the bottom surface of the foundation in order to completely bury the wooden pile below the normal water level. The use of wooden piles has always involved an uneconomical design of the foundation, such as taking the height unnecessarily large relative to the required proof strength, and in the case of a solid foundation, installing a basement against the structural requirements. ..

There is also a method of making a wooden pile itself have corrosion resistance by impregnating or applying an antiseptic agent or an anticorrosive agent instead of making the bottom of the foundation deep, but the antiseptic agent or the anticorrosive agent is dissolved in groundwater. However, the use of wooden piles is actually difficult because it may cause pollution.

The present invention has been made in view of the actual situation when using such wooden piles, and does not require an uneconomical foundation,
In addition, we are going to propose a new burying method that utilizes wooden piles without causing pollution.

[0007]

According to the present invention, a wooden pile is embedded in a solidified body formed by stirring and mixing excavated soil and solidifying material in the ground improvement method, and the wooden pile is covered with the solidified body. Or by filling the fixing liquid containing the solidifying material into the drilled holes and burying the wooden pile in this fixing liquid and coating the wooden pile with the fixing liquid To effectively utilize wooden piles without the need to build a foundation, and without depending on preservatives or anticorrosion agents, without being controlled by the depth of the groundwater level.

In the case of forming a solidified body, the excavated earth and sand cut at the time of excavation of the excavating rod having the stirring blade projecting on the peripheral surface and the solidified material discharged from the tip of the excavating rod are stirred and mixed. After forming a solidified body in the ground, drive a wooden pile into the solidified body before hardening, and harden the solidified body with the surroundings covered with the solidified body over the entire length, Fix it.

In the case of embedding in a drilling hole, the drilling rod is dug to a target depth to drill a drilling hole in the ground, and the drilling hole is filled with a fixative containing a solidifying material, and then in this fixative. A wooden stake is driven in before the hardening, and the fixing liquid is hardened in a state where the surroundings are covered with the fixing liquid to fix the wooden stake.

Since the solidifying material is a cement material,
By contracting during curing, it covers and protects the peripheral surface of the wooden pile, and because the solidified body that is the hardened body of cement and the hardened body of the fixing liquid show high alkalinity mainly due to calcium ions, microorganisms and bacteria ， It has high resistance to harmful fungi, that is, anticorrosion effect, and wooden piles maintain bearing capacity regardless of the depth of the groundwater level without corrosion or decay during the useful life of the building.

The entire length of the wooden pile is covered with a hardened cement body,
As it is protected from being affected by the depth of the groundwater level, it does not require a deep foundation, enables its economical design, and eliminates the need for preservatives and anticorrosion agents, resulting in pollution. To avoid the occurrence of.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment.

According to the present invention, the fixing liquid 7 containing the solidifying material filled in the drilled hole H is formed by driving the wooden pile P into the solidified body S formed by stirring and mixing the excavated sand and the solidifying material. This is a method in which the wooden pile P is buried in a protected state regardless of the depth of the groundwater level by driving the wooden pile P therein.

First, the invention according to claim 1 will be described. This method is a method in which a solidified body S is formed in the ground by a ground improvement method in which excavated soil and a solidifying material are mixed together with excavation of the ground, and then a wooden pile P is inserted and buried before hardening.

First, as shown in FIG. 1, the excavator M is installed at the position where the solidified body S is formed. The excavator M is a ground improvement machine having a stirring blade 2 on the peripheral surface of the excavating rod 1 and excavating by excavating the excavating rod 1 and stirring and mixing the excavated soil and the solidified material. As shown in, the solidified material is discharged from the tip and is advanced with stirring along with the excavated earth and sand. Discharge of solidified material, that is, stirring of solidified material and excavated sediment,
The mixing may be performed after the tip of the excavating rod 1 reaches the target depth and the excavation is once completed. The solidifying material is soil cement in which water or soil in the ground is mixed with cement, or slurry such as mortar or cement milk.

After the excavation bit 3 at the tip of the excavation rod 1 reaches the target depth, the excavation rod 1 is continuously withdrawn as shown in FIG. 3 while discharging the solidified material to mix the solidified material with the excavated earth and sand. ..

When stirring and mixing are insufficient in one reciprocation, as shown in FIGS. 4 and 5, mixing is carefully performed again by the secondary excavation and withdrawal by the excavating rod 1.

The above steps are the same as those in the ordinary ground improvement method in which the ground is improved by stirring and mixing the excavated sand and the solidifying material to form the solidified body S in the ground.

After the stirring and mixing are completed, the wooden pile P is suspended on the drilled hole H as shown in FIG. 6, and the drilling rod 1 is used to maintain the verticality of the wooden pile P. It is pushed to the bottom of the hole, and the wooden pile P is fixed to the solid pile S in the state where the solid pile S is covered over the entire length. The solidified body S is cured as it is, and the burying of the wooden pile P is completed.

The covering layer of the wooden pile P with the solidified body S, that is, the distance between the outer periphery of the wooden pile P and the inner periphery of the drilled hole H is at least
It is preferable to secure about 10 mm or more, and the drilled hole H is formed with a diameter that allows for this coating layer.

This invention has a diameter of 800 mm, a length of 5 m and a compressive strength of 5.
3kg / cm ² , solidifying agent content 250kg / m ³ , and a solidified body S with a water-cement ratio of 80% was embedded with a wooden pile P of diameter 200mm and length 5.5m, and after 6 months, As a result of inspecting the wooden pile P by digging up the earth and sand and the solidified body S, it has been confirmed that no corrosion occurs in the wooden pile P.

Next, referring to FIGS. 7 to 12, the method of inserting the fixing liquid 7 containing the solidifying material after the drilling of the drilled hole H and inserting the wooden pile P therein will be described.

First, as shown in FIG. 7, the earth is excavated by the earth auger 4 while excavating the ground. The excavation is performed while pouring the hole wall stabilizing liquid 5 such as bentonite muddy water into the drilling hole H.

After the tip reaches the target depth as shown in FIG. 8, the tip of the earth auger 4 is replaced with the hole wall stabilizing liquid 5 as shown in FIG. 9, and the root hardening liquid 6 for hardening the hole bottom is discharged. , The earth auger 4 is pulled out while filling the hole H. The rooting solution 6 is injected into the bottom of the hole while mixing the sand or gravel in order to secure the supporting force in the supporting layer.

The root hardening liquid 6 to be filled below the drilling hole H is mainly cement to which water is added, and it may be filled over the entire length of the drilling hole H, but as shown in FIG. From the middle of pulling out the earth auger 4, it is preferable to maintain the softness until it has the anticorrosion effect until the wooden pile P is driven, and it is preferable to switch to the fixing solution 7 having high alkalinity. The fixative 7 is concretely soil cement in which a cement-based solidifying material mixed with a high-alumina special clinker is mixed with soil in the ground, or soil cement slurry in which water is added to it, which has an anticorrosion effect. In addition, copper sulfate, creosote oil, etc. may be added to raise the temperature.

After pulling out the earth auger 4, as shown in FIG. 11, the wood pile P is driven into the hole H while maintaining the verticality by a pile driver, and is press-fitted to the hole bottom as shown in FIG. The wooden pile P is fixed in the drilling hole H in a state where the cured body is covered with the hardened body 7 in its entire length by the curing of the fixing liquid 7 as it is.
Burial is completed.

Also in this invention, a coating layer of about 10 mm or more is secured between the outer periphery of the wooden pile P and the inner periphery of the drilled hole H.

This invention also has a hole diameter of 500 mm and a hole length of 10
m, cement amount 640 kg, water-cement ratio 70% root fixer 6 and fixed liquid 7 with compressive strength after hardening of 5 kg / cm ² or more
It was confirmed that no corrosion occurred after 6 months.

[0029]

EFFECTS OF THE INVENTION The present invention is as described above, and wood is added to a solidified body formed by stirring and mixing excavated soil and solidifying material, or in a fixing liquid containing the solidifying material filled in the drilling holes. Since the entire length is covered with a solidified body or a hardened body of fixing liquid by driving the pile, and the wooden pile is fixed in the drilled hole in a protected state, it is not controlled by the depth of the groundwater level, In addition, it is possible to utilize the wooden pile without depending on the antiseptic agent or the anticorrosive agent and effectively exert its supporting force.

Further, since it is not necessary to build an unnecessarily deep foundation, the foundation can be economically and rationally designed, and at the same time, the preservatives and the like are not required and the occurrence of pollution is avoided. You can

[Brief description of drawings]

1 is an elevational view showing a first step of the invention according to claim 1; FIG.

FIG. 2 is an elevation view showing the next step of FIG.

FIG. 3 is an elevational view showing the next step of FIG.

FIG. 4 is an elevation view showing the next step of FIG.

FIG. 5 is an elevation view showing the next step of FIG.

FIG. 6 is an elevational view showing the next step of FIG.

FIG. 7 is an elevational view showing a first step of the invention according to claim 2;

FIG. 8 is an elevation view showing the next step of FIG. 7.

FIG. 9 is an elevation view showing the next step of FIG.

FIG. 10 is an elevation view showing the next step of FIG. 9.

FIG. 11 is an elevational view showing the next step of FIG.

FIG. 12 is an elevational view showing the next step of FIG. 11.

[Explanation of symbols]

P ... Wooden pile, H ... Drilling hole, S ... Solid body, M ... Excavator, 1 ... Excavation rod, 2 ... Stirring blade, 3 ... Excavation bit, 4 ... Earth auger, 5 …… Pore wall stabilizer, 6 ……
Fixing solution, 7 ... fixing solution.

Claims (2)

[Claims] 1. A solidified material is ground in the ground by stirring and mixing excavated earth and sand cut at the time of excavation of an excavating rod having a stirring blade projecting on the circumferential surface and a solidifying material discharged from the tip of the excavating rod. After construction, hammer wooden pegs into this solid before hardening.
A method for burying a wooden pile, in which the solidified body is hardened in a state where the surrounding area is covered with the solidified body over the entire length to fix the wooden pile. 2. The ground is excavated to form a hole in the ground, a fixing solution containing a solidifying material is filled in the hole, and then a wooden pile is driven into the fixing solution before hardening. A method for burying wooden piles, in which the fixing liquid is cured while the surroundings are covered with the fixing liquid over the entire length to fix the wooden piles.