JP3453351B2 - Screw Auger Lifting Method and Screw Auger - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to earth auger drilling and drilling excavation to be carried out for improvement of soft ground, by forming spiral blades on the peripheral surface of a rod to be drilled by rotary insertion into the target ground. The present invention relates to a screw auger hoisting method for hoisting excavated soil by rotating a spiral blade and a screw auger used therefor.

[0002]

Conventionally, for earth drilling earth drilling or earth drilling which is carried out in association with improvement of soft ground, spiral blades are formed on the peripheral surface of a rod which is rotationally inserted into the target ground and drilled. Then, the method of excavating the excavated soil by rotating the spiral blade has been used.However, when the drilling depth becomes deep, the auger rod swings due to the rotation, and it becomes difficult to smoothly excavate the soil. There was a problem that torque was not sufficiently transmitted to the tip.

On the other hand, as for drilling soil excavated to improve soft ground, a screw auger is often attached to the side circumference of the injection rod for the purpose of assisting the operation of the tip monitor. However, when an overhanging nozzle is set on the tip monitor, the screw auger is required to have functions such as crushing excavated soil and preventing run-out during rotation of the long rod, in addition to simple pumping. Is becoming.

Further, regarding the drilling excavation to be carried out for the improvement of the soft ground, the ground pressure of the target ground is increased by the injection pressure of the hardening material injection from the tip monitor, and the hole wall of the rod insertion hole is grounded. However, when the excavated soil is positively discharged by the screw auger, the balance between the internal pressure of the rod insertion hole and the external pressure of the surrounding soil becomes unbalanced, and the protection of the insertion hole wall becomes a further problem. .

In addition, as for the drilling excavation to be carried out accompanying the improvement of soft ground, as the demand for injection into the target ground at a high depth and the formation of a large diameter injection layer become strong, the length of the injection rod becomes longer. There is also a problem that a reaction force is generated in the operation such as rotation, and it becomes difficult to reliably transmit the power with respect to the operation of the rod.

[0006]

According to the present invention, the sliding friction between the spiral blade and the peripheral soil due to the rotation of the spiral blade is incorporated within the spiral interval of the spiral blade in response to the lengthening of the auger rod. The excavated excavated soil is distributed by orienting the turning in a direction opposite to the turning direction of the screw to balance the turning of the auger rod.

The excavated soil taken into the spiral interval of the spiral blade is given a swirling force in a direction opposite to the swirling direction of the screw, so that the excavated soil is taken into the spiral interval between the soil around the auger rod and the spiral blade. The edge of the excavated soil is cut off to smoothen the rotation of the auger rod and to minimize the influence of the rotation friction on the surrounding soil.

That is, the upper and lower blade tips formed by the spiral interval of the screw blades of the screw auger are connected at predetermined intervals by swirl vane struts that direct the swirl in a direction opposite to the swirl direction of the screw, and the spiral vanes are connected. The turning force is applied to the excavated soil taken into the spiral interval in the direction opposite to the turning direction of the screw.

Further, by constructing the screw auger constructed as described above into a part auger which can be attached to and detached from the auger rod, the drilling excavation work to be carried out in association with the improvement of the soft ground can be carried out by the injection rod. It was mounted at an appropriate position so that the curing material could be injected according to the injection environment.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an auger rod, in which a spiral wing 2 is formed on a peripheral surface of an axial rod 11, and upper and lower wing tips 3 constituted by a spiral interval A of the spiral wing 2 are arranged in a direction opposite to a screw turning direction. It is connected at predetermined intervals by swirl vane struts 4 that direct the swirl.

A drill bit or a monitor (not shown) is attached to the tip of the auger rod 1, and the rod 1
By a drive mechanism (not shown) attached to the ground, the spiral blade 2 is excavated so as to scoop the ground when it is lowered while rotating toward the target ground, and the soil is placed on the blade width 5. The excavated soil is transferred and lifted up as the wing width rotates.

The swirl vane support 4 is composed of a plate strip or a twisted vane and directs the swirl in a direction opposite to the swirling direction of the screw. As a result, the turning force works in the direction to push up the sliding and promotes the transfer of the soil.

Further, when the screw auger is rotated at a high speed, the swirl vane strut 4 acts as a wind-breaking blade to suppress the shake due to the rotational reaction force acting on the rotating auger rod and maintain the verticality of the rod for smooth operation. It helps the rotation.

As for the boring earth excavated for the improvement of soft ground, the center rod 1 serves as a ground hardening material pouring rod, and the spiral blade 2 is set on the side circumference of the boring earth pouring ground when the pouring rod is inserted. And, while rotating and retracting the injection rod inserted to a predetermined depth, it is used for excavation and excavation when the hardening material is injected from the injection hole provided in the rod and the hardening material is injected into the surrounding soil and stirred and mixed. .

In that case, it is not necessary to set the spiral blade 2 on the entire rod, but it is more effective to set the spiral blade 2 on a required portion by a predetermined length. The axial center portion of the screw auger divided into predetermined lengths is effective. 2 is divided into two parts as shown in FIGS. 2 and 3, and the center rod is clamped from both sides by vertically dividing it into two parts. If it is configured as a possible parts auger, it can be effectively used for injection of ground hardening material.

That is, FIG. 4 shows an embodiment in which the screw auger according to the present invention configured as a parts auger is attached to the tip of the ground hardening material injecting rod 6, and an overhanging bit 61 is attached to the tip. A nozzle 62 is provided, and a screw auger according to the present invention is mounted on the upper portion of the nozzle 62 to form an injection rod monitor.

Such a monitor is attached to the injection rod, the injection rod 6 is inserted to a predetermined depth while excavating with the excavation bit 61 toward the target ground, and the curing nozzle is injected from the injection nozzles 64, 64 while the rod is injected. The soil stirred by the overhanging nozzle 62 and the stirring blade 63 is taken up by the spiral blade 2, and is swirled by the swirl blade strut 4 in a direction opposite to the screw swirling direction. The soil is crushed and the ground pressure and airlift are made easier to ride, and the soil is actively discharged.

Further, since the swirl is directed in the reverse direction, the edge of the soil surrounding the hole wall is cut off and the collapse of the hole wall is effectively prevented.

Since the present invention is constructed as described above, it is possible to prevent the shake due to the rotation of the screw auger, and
In addition to being able to crush ground soil and excavate it in a state where it is easy to process, it is also effective in increasing the injection effect by applying it to the ground hardening material injection rod.

[0020]

[Brief description of drawings]

FIG. 1 is a side view of a screw auger showing an embodiment of the present invention and showing a structural relationship between a spiral wing and a swirl wing support.

FIG. 2 is also a view showing an embodiment of the present invention, in which a screw auger showing a relationship between a swirl of a spiral blade and a swirl orientation by the swirl blade strut across an auger shaft center, a swirl blade strut, and a continuation portion of the spiral blade. Enlarged cross-sectional plan view of

FIG. 3 is a perspective view of a parts auger according to an embodiment of the present invention.

FIG. 4 is a side view of a tip portion of an injection rod in which a parts auger according to an embodiment of the present invention is mounted on a ground hardening material injection rod and configured as a monitor.

[Explanation of symbols]

1 Auger rod 11 Axial rod 2 spiral wings 3 Wings of spiral wing 4 swirl post 5 Wingspan of spiral wing 6 Ground hardening material injection rod 61 drill bit 62 Overhang nozzle 63 stirring blade 64 injection nozzle 65 Part auger rod fastening part A Spiral spacing of spiral wing

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-8-28169 (JP, A) JP-A-55-78717 (JP, A) JP-A-7-305587 (JP, A) JP-A-49- 9803 (JP, A) Actual development Sho 50-48405 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21B 7/00 E02D 3/12 102 E02D 7/00

Claims (3)

(57) [Claims] 1. An upper and lower blade tip constituted by a spiral interval of a spiral blade of a screw auger is connected at predetermined intervals by a swirl vane strut for directing swirl in a direction opposite to the swirl direction of the screw. Screw auger excavation method characterized by excavating the excavated soil taken into the spiral interval of the spiral blade by inserting the auger rod into the target ground in a direction opposite to the excavation turning direction. 2. A screw auger in which upper and lower blade tips, which are formed by a spiral interval of screw blades of a screw auger, are connected at predetermined intervals by swirl vane struts for directing swirl in a direction opposite to the swirl direction of the screw. 3. A screw auger divided into a predetermined length has a shaft center portion which is vertically divided into two portions and is formed into a cylindrical shape in which a center rod is sandwiched from both sides, or a cylindrical shape in which a fastening structure is provided on the upper and lower sides. The screw auger according to claim 2, wherein the screw auger is configured to be attachable / detachable at an appropriate position of the center rod.