JPH073052B2 - Method of embedding underground penetration member - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for embedding an underground penetrating member such as a pile or a steel sheet pile, and in particular, it is easy to press fit the underground penetrating member on relatively hard ground. Regarding possible embedding methods.

《Prior Art》 Conventionally, as a method of press-fitting and embedding underground penetration members such as steel sheet piles and steel pipe piles, a ground auger is driven to rotate to form a columnar stirring part in the ground, and the ground stirring part or the stirring part A method is known in which the underground penetrating member is press-fitted into the columnar stirring portion after formation.

With such a construction method, there is an excellent feature that it can be installed without noise and vibration, and that the underground penetrating members are press-fitted with a static load so that these members are less damaged and can be installed in a clean environment. However, there was a problem explained below.

<< Problems to be Solved by the Invention >> That is, in the above method, a columnar stirring portion is formed in the ground by an earth auger, but in this case, if the ground is hard, it may be difficult to stir, or sufficient stirring may be necessary. There was a problem of having a long time.

In order to solve such a problem, a method of injecting bentonite mud into the columnar stirring part when cutting the ground with an earth auger has been proposed, but this method is used for producing excavated soil mixed with wastewater. It becomes a waste, and its disposal is expensive, and there is a problem of environmental pollution.

The present invention has been made in view of such conventional problems, and an object thereof is to easily perform cutting and agitation on a relatively hard ground, and further to prevent environmental pollution and waste treatment. An object of the present invention is to provide a method for embedding an underground penetration member that does not have any problem.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention, by rotating the earth auger while injecting bubbles to cut the ground, by reversing and pulling out the earth auger, It is characterized in that a columnar stirring section in which air bubbles are mixed is formed in the ground, and an underground penetrating member such as a pile or a steel sheet pile is press-fitted in or in contact with the columnar stirring section.

<Operation> According to the method of embedding the underground penetrating member having the above-described configuration, the columnar stirring portion is sufficiently stirred by the bearing effect of bubbles when the ground is cut by the earth auger and when the ground auger is pulled out, and thereafter When the penetrating member is press-fitted, the stirring part is sufficiently stirred and the bubbles are mixed, so that the press-fitting resistance can be reduced and the capacity of the press-fitting pushing device can be reduced. It can be made small and press-fitting work is easy.

Further, the air bubbles mixed in the stirred earth and sand disappear in a relatively short time when left in the air, and the earth and sand in which the air bubbles disappear return to the original state and can be discarded as they are.

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of a method for embedding an underground penetration member according to the present invention.

FIG. 1 shows the overall structure of devices such as an embedding device for an underground penetration member used in this embodiment. In this embodiment, a steel sheet pile 10 is used as the underground penetration member. Steel sheet pile
The embedding device 10 includes a column 14 that suspends and supports the steel sheet pile 10 and the earth auger 12, and a base machine 16 that holds the column 14 in a vertical state. Earth auger
A reducer motor 18 for rotating the twelve is provided at the upper end of the twelve, and a guide pole 20 for guiding the earth auger 18 and the steel sheet pile 10 is attached to the column 14 at the lower end thereof. . A pushing device 22 for press-fitting the steel sheet pile 10 is installed above the guide pole 20.

Further, on the central axis of the earth auger 12, as shown in a part of FIG. 2, an injection pipe 24 is provided so as to extend therethrough to the tip thereof, and the upper end of the injection pipe 24 is provided. A swivel joint 26 installed below the reduction gear motor 18 is connected to the. One end of a bubble supply hose 28 is connected to the swivel joint 26, and the other end of the bubble supply hose 28 is extended to the ground and connected to a bubble generator 30.

Compressed air from the compressor 32 and the foaming agent 36 contained in the tank 34 are supplied to the bubble generating device 30 via the pump 38, and fine shaving cream-like bubbles are formed. The foaming agent 36 used here is a protein-based foaming agent or a surfactant, and the former is, for example, non-toxic animal hydrolyzed protein, which has an excellent foaming action, Also, the foam is stable. Examples of the latter include, for example, higher alkyl ether sulfuric acid ester salts of anionic surfactants, and especially sodium dauryl ether sulfuric acid ester has an excellent foaming action.

Next, a method of embedding the steel sheet pile 10 in the ground E by using the devices having the above-described configuration will be described.

As shown in FIG. 1 (b), the steel sheet pile 10 is suspended and supported by a column 14. In this embodiment, the earth auger 12 is first rotated by the drive of the reduction gear motor 18 to cut the ground E. . When cutting the ground E, the compressor 32,
The pump 38 is also driven, and the bubbles generated by the bubble generator 30 are sent to the bubble supply hose 28, the swivel joint 26, and the injection pipe 24, and then injected into the ground E that is cut from the tip side of the earth auger 12. To be done.

Then, when the ground E is cut to a predetermined depth, the earth auger 12 is pulled out while being reversed, and as a result, the columnar stirring section 40 in which bubbles are mixed in the ground E is formed. After that, as shown in FIG. 1 (b), the steel sheet pile 10 is attached to the column 14 and press-fitted via the pushing device 22. Steel sheet pile 10
After that, the above operation is repeated while forming the trailing columnar stirring section 40 which is slightly overlapped with the preceding columnar stirring section 40 in the lateral direction, and the ends of the steel sheet piles 10 are connected to each other. Then, the steel sheet piles 10 are sequentially connected and embedded in the ground E.

Now, according to the embedding method of the underground penetrating member of the present embodiment configured as described above, when forming the columnar stirring portion 40, since bubbles are injected into the columnar stirring portion 40, the stirring sand And bubbles are mixed with each other, which increases the fluidity of the sand and sand and improves the stirring efficiency.

Further, also when treating the residual soil generated when the steel sheet pile 10 is embedded, the bubbles mixed in the stirred sediment disappears in a relatively short time when left in the air, and the soil in which the bubbles disappear is in the original state. You can return to and discard as is.

In addition, a solidifying agent such as cement milk is injected into the columnar stirring section 40 together with the bubbles, and the H-shaped steel is injected into the columnar stirring section 40 in a state where the bubbles, the solidifying agent, and the excavated earth and sand are stirred and mixed. It is also possible to press-fit parent piles such as, and form the columnar stirring portions 40 in a columnar shape in the lateral direction so as to overlap each other.

<< Effects of the Invention >> As described in the above embodiments, according to the method of embedding an underground penetration member according to the present invention, bubbles are injected when the ground is cut by an earth auger, so that the mixture is agitated with the bubbles. The fluidity of the sand becomes large, the columnar stirring portion can be easily formed even on hard ground, and the stirring efficiency is also improved.

In this way, the columnar stirring part is sufficiently agitated, so that when air bubbles are injected into the columnar stirring part, when the underground penetrating member such as piles or steel sheet piles is subsequently pressed into the columnar stirring part. The resistance of the press-fitting device becomes small, the capacity of the press-fitting pushing device can be made small, and the press-fitting work is easy.

In addition, the bubbles injected into the columnar stirring unit disappear in a relatively short time, and the excavated earth and sand from which the bubbles have disappeared return to the original state, so that the environment is not polluted even if discarded as it is.

[Brief description of drawings]

FIG. 1 is an overall view of devices used in the method of the present invention, and FIG. 2 is an explanatory view of a process of forming a columnar stirring portion formed by the method,
FIG. 3 is a top view of the columnar stirring section. 10 …… Steel sheet pile (ground penetrating member), 12 …… Ground auger 22 …… Pushing device, 24 …… Injection pipe 30 …… Bubbling device, 36 …… Foaming agent 40 …… Column stirrer

Claims (1)

[Claims] 1. A ground auger is rotated while injecting air bubbles to cut the ground, and then the ground auger is reversed and pulled out to form a columnar stirring section in which bubbles are mixed in the ground, and the columnar stirring is performed. A method for embedding an underground penetrating member, which comprises press-fitting an underground penetrating member such as a pile or a steel sheet pile so as to come into contact with or inside the part.