JPH11269866A - Device for constructing rectangular continuous wall, pile, etc. - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for constructing rectangular continuous wall, pile, etc., having versatility with simple construction. SOLUTION: A rotary wing 5 is provided between rectangular fixed wings 4 provided as a pair to an excavation rod 1 having a rotary bit on the front end, and a jet holding plate 6 is provided to the lower side fixed wing 4b facing an improving material jet outlet opened to the excavation rod 1. Accordingly, there is no residual part in four corner sections of a rectangular frame, stirring and mixing with the improving material is surely made, and it can correspond to a large number of properties in soil. A rectangular improved body can be surely and easily formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for forming a rectangular continuous wall, a pile or the like.

[0002]

2. Description of the Related Art Conventionally, when soil improvement is performed over a wide area by the deep mixing method, a cylindrical soil improvement pile is tangentially rounded (formed in an adjacent state), or after tangentially rounding. This is done by adding a cylindrical ground improvement pile to the dead space. Therefore, the former has a problem in the strength of the pile. In the latter case, there are problems such as extension of the construction period, complicated work, and economic disadvantages associated with the construction of the dead space. As an improvement, for example, recently, it has been proposed to perform a rectangular deep ground improvement method. Certainly, this rectangular deep ground improvement method is useful for solving the aforementioned problems.

[0003] Similarly, when forming a continuous wall in the form of a column,
Conventionally, a deep ground improvement pile is continuously formed in a cylindrical shape in a tangent shape, and a structural steel material is inserted into the formed pile material to form a continuous wall. However, when excavating the inside of the formed continuous wall, it has been confirmed that soil enters along with groundwater from the circumscribed portion due to poor verticality or poor improvement, and collapse of the nearby ground occurs. Therefore, it has been confirmed that, by continuously improving the rectangular deep ground, the connecting portion is long and strong, and the occurrence of collapse of the nearby ground is reduced.

[0004] As the apparatus for forming such a rectangular continuous wall, pile, etc., there are the following prior art documents. (1) JP-A-7-20765
There is No. 6 ground improvement machine. FIG. 9 and FIG. 11 show the prior art in this document, which has a configuration in which a rectangular frame and excavation wings that excavate in the soil while rotating are provided. This is a technique for forming an improved body corresponding to a rectangular frame through excavation of soil and mixing with an improved material using the excavated wings. (2) JP-A-7-305335
No. 1 ground improvement stirrer and ground improvement method using the same. This document has a configuration in which a casing having a rectangular cross section and upper and lower stirring blades are provided on a rod body provided with a bit. This document is a technique for forming a solid body having a rectangular cross-sectional shape from the bottom portion by using the vertical movement of a casing.

[0005]

According to the prior art disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-207656, there is a residual portion where the tip of the drilling wing does not reach the four corners of the rectangular frame. A part of the soil may not be sufficiently mixed and stirred with the filler, and an improved body having a rectangular cross section (hereinafter, referred to as a rectangular improved body) may not be formed. That is, it is easy to obtain an improved body in which the corners of the pillar are missing.

The document of Japanese Patent Application Laid-Open No. 7-305335 is considered to have problems such as a complicated structure, a case where the vertical movement of the casing does not work depending on the soil, and a lack of versatility.

[0007]

According to the first aspect of the present invention, there is provided a rectangular frame having no residual portions at the four corners and capable of being reliably stirred and mixed with an improving material, or capable of coping with many soil properties. Further, it is intended that a rectangular improved body can be reliably and easily formed.

A first aspect of the present invention is to provide a pair of rectangular fixed wings on a drilling rod having a rotating bit at a tip, and to provide a rotary wing between the rectangular fixed wings. An apparatus for forming rectangular continuous walls, piles, or the like, characterized in that opposing spray receiving plates are provided on the lower fixed wing.

[0009] The invention of claim 2 intends to provide an optimum soil for reliable excavation and mixing.

According to a second aspect of the present invention, there is provided a device for forming a rectangular continuous wall, a pile or the like, in which a rotary bit is formed in a conical shape and a number of blades are provided on the rotary bit.

[0011] The invention of claim 3 aims to surely and smoothly mix and improve the improved material with the excavated soil.

A third aspect of the present invention is a device for forming a rectangular continuous wall, a pile or the like having a configuration in which the injection ports are opened in a rectangular diagonal shape.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a rectangular improved pile shown in FIGS. 1 to 5, a drill bit is rotated via a driving machine (not shown), and a rotary bit and a rotary bit are rotated through the rotation of the drill rod. Rotate the rotor. The underground is excavated with the rotary bit and the blade at the tip, and the excavated earth and sand (referred to as excavated earth and sand) is stirred by the rotating blades. This rotation bit
The ground is excavated in a substantially circular shape, but since the vicinity of the substantially circular shape is considerably soft, the fixed wing on the lower side of the rectangle can excavate in the ground, and the substantially circular excavation can be performed. Turn holes into rectangular drill holes.

The excavated earth and sand generated by the above-mentioned operation is:
Furthermore, it is agitated and mixed by the lower rotor, and is also an improved material (improved material obtained by mixing bentonite and cement milk)
Stirring and mixing with water. This improved material is injected from the injection port at the tip of the drilling rod toward the spray receiving plate, and is retained in the fixed wing below the rectangle, ensuring reliable and efficient mixing and mixing with the excavated earth and sand. Plan.

The mixed sediment (rectified rectangular pile material) of the excavated sediment and the improvement material generated by the operation of the fixed wing and the rotary wing on the lower side of the rectangle described above reaches the fixed wing on the upper side of the rectangle. ,
Somewhat agitated and mixed. This rectangular improved pile material is retained in the fixed wing on the upper side of the rectangular shape, and features such as being able to reliably and efficiently generate the rectangular improved pile or helping to eliminate secondary pollution There is.

By repeating the above-described operations and using means such as pulling up of the apparatus, an improved pile having a predetermined standard (setting) shown in FIG. 5 is formed. Although not described in detail,
There is also a possibility of creating an improved pile that excavates to a predetermined position in the ground with the present device and agitates and mixes the improving material with the excavated soil when the present device is pulled out.

In the rectangular continuous wall shown in FIG. 6, the above-mentioned rectangular improved piles are sequentially formed, and the side faces of the rectangular improved piles are adjacent to each other, so that the strength is excellent, the vertical is poor, and the improvement is poor. There is a feature that is useful for eliminating or preventing water leakage. A reinforcing material is inserted into the rectangular continuous wall.

[0018]

Next, an embodiment of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes a drilling rod provided on a drive unit (drive device) provided on a civil engineering / construction work machine such as a ground improvement machine or an excavator (not shown). The rotating bit 3 is provided. This rotation bit 3
Has a conical shape, but is not limited thereto, and may have a wing shape. The rotary bit 3 rotates simultaneously with the drill rod 1.

Reference numeral 4 denotes a rectangular fixed wing which is loosely fitted to the excavating rod 1 in a pair. In this example, the fixed wing includes an upper fixed wing 4a and a lower fixed wing 4b. The upper and lower fixed wings 4a, 4
b is provided with an interval H. The upper and lower fixed wings 4a,
4b are sleeves 41a, 41 loosely fitted to the drill rod 1.
b and supporting arms 42a and 42b provided in the radial direction from the sleeves 41a and 41b. In the drawing, 43a and 43b indicate stirring pieces provided on the upper and lower stationary blades 4a and 4b, respectively.

5 is an interval H between the upper and lower fixed wings 4a and 4b.
(Between the rectangular fixed wings 4).
Is configured to rotate simultaneously with the excavation rod 1, and to stir and mix the excavated earth A excavated with the rotary bit 3 and the improvement material B injected from the injection port 6 of the excavation rod 1 to generate an improved pile material. Has a role. In the figure, reference numeral 51 denotes several stirring pieces provided on the rotary blade 5.

Numeral 6 denotes a jet receiving plate provided on the lower fixed blade 4b.
This is a configuration for receiving the improved material B that is sprayed more. The characteristic is that the improved material B can be retained in the fixed wing 4b on the lower side of the rectangle.
Mix. The spray receiving plate 6 is provided on the entire lower fixed blade 4b, but may be a part in some cases. still,
A configuration in which the jet receiving plate 6 and the stirring piece 43b are used in combination is also possible. Ideally, the injection port 7 opens diagonally to the rectangular fixed wing 4.

[0023]

According to a first aspect of the present invention, a rotary wing is provided between a pair of rectangular fixed wings provided on a pair of drilling rods having a rotary bit at a tip thereof, and the rotary blade is injected to face an injection port of an improved material opened to the drilling rod. A reclamation device such as a rectangular continuous wall or a pile, wherein a receiving plate is provided on a lower fixed wing. Therefore, there is no residual portion at the four corners of the rectangular frame, and it can be surely stirred and mixed with the improving material, or it can cope with many soil properties,
In addition, the improved rectangular body can be reliably and easily created,
And so on.

According to a second aspect of the present invention, there is provided an apparatus for forming a rectangular continuous wall, a pile, or the like, in which a rotary bit is formed in a conical shape and a number of blades are provided on the rotary bit. Therefore, it is possible to make the soil optimal for reliable excavation and mixing.

A third aspect of the present invention is a device for forming a rectangular continuous wall, a pile or the like having a configuration in which the injection port is opened in a rectangular diagonal shape. Therefore, stirring and mixing of the improved material with the excavated soil can be performed reliably and smoothly.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire construction device such as a rectangular continuous wall and a pile.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a schematic diagram illustrating a state of excavation in FIG. 1;

FIG. 5 is a plan view of a rectangular improved pile.

FIG. 6 is a plan view of a rectangular continuous wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling rod 2 Claw 3 Rotating bit 4 Rectangular fixed wing 4a Upper fixed wing 41a Sleeve 42a Support arm 43a Stirrer piece 4b Lower fixed wing 41b Sleeve 42b Support arm 43b Stirrer piece 5 Rotor wing 51 Stirrer piece 6 Spray plate 7 Injection port A Excavated soil B Improvement material C Reinforcement H Interval

Claims (3)

[Claims] 1. A drilling rod having a rotating bit at its tip is provided with a pair of rectangular fixed wings, a rotating wing is provided between the rectangular fixed wings, and a jet facing the injection port of the improved material opened to the drilling rod. An apparatus for forming a rectangular continuous wall, a pile, or the like, wherein a receiving plate is provided on the lower fixed wing. 2. The apparatus according to claim 1, wherein the rotary bit is formed in a conical shape, and the rotary bit is provided with a large number of blades. 3. The apparatus for forming a rectangular continuous wall, a pile or the like according to claim 1, wherein said injection port is opened in a rectangular diagonal shape.