JP2619321B2 - Ground reinforcement method using large diameter tensile reinforcement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing method for reinforcing ground immediately after cutting or general ground.

[0002]

2. Description of the Related Art Various construction methods have been developed for preventing collapse of a newly cut slope or reinforcing a general ground.

[0003]

However, the conventional technique has the following problems when, for example, construction is performed in the immediate vicinity of a railway in use. <B> It is difficult to carry out reinforcement work without affecting the surrounding ground. <B> In particular, it is a method to improve earth and sand with a large diameter.
It is dangerous because the surrounding earth and sand may collapse. <C> If the method is to improve the earth and sand with a small diameter, the risk is reduced, but the construction takes time and effort.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to improve such a point, and it is an object of the present invention to provide a method for safely reinforcing the ground by using a large-diameter tensile reinforcement.

[0005]

That is, the present invention, in order to solve the problems] is drilling stirring rod provided with a drilling wing and a stirring blade around a hollow rotary shaft is advanced into the ground, stirred drilling and agitating soil cement milk simultaneously And rotating the core made of a rod-like body having a fixing body formed at the tip while rotating through the hollow of the hollow rod, and passing the hollow portion of the hollow rod through the hollow ground of the excavated and stirred earth and sand area. A large-diameter tensile reinforcement having a step of inserting a core material and a step of reversely rotating the hollow rod while leaving the core material at the center and discharging cement milk from the tip and taking it out of the ground. This is a method of reinforcing the ground using a body.

[0006]

According to the present invention, the excavated soil and cement milk are stirred and mixed in the ground while excavating the ground, so that the surrounding ground does not collapse and the large-diameter Tensile reinforcements can be built. <B> When constructing a tension reinforcing body with an excavating and stirring hollow rod, the core material may be inserted into the ground at the tip of the tension reinforcing body through the hollow of the rod, and the core material may be disposed at the center of the tension reinforcing body. I can do it. <C> Since the periphery of the core material is hardly agitated, the core material is surrounded by the cement milk discharged when the stirring hollow rod is pulled out, and the core material and the surrounding improved earth and sand can be firmly adhered to each other.

[0007]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. <A> Excavation-Stirred Hollow Rod FIG. 1 shows a configuration example of an excavated-stirred hollow rod 1 used in the construction method of the present invention. The excavating and stirring hollow rod 1 is a device in which an excavating blade 11 and a stirring blade 12 are protruded around a tip of a hollow rotary shaft 13. The rotating shaft 13 is formed by a long hollow cylinder. Cement milk is supplied or the core material 2 is inserted through a hollow portion inside the rotating shaft 13. A distal end hole communicating with the hollow portion is opened at the distal end of the hollow rotary shaft 13. The diameter of this tip hole is determined by a core material 2 described later.
Is formed in such a size as to pass through. Further, a cement milk discharge port is formed around the tip hole. For this purpose, the cement milk supplied through the hollow portion of the rotating shaft 13 is supplied to the excavated soil through this discharge port.

The excavation wing 1 is located around the tip of the hollow rotary shaft 13.
Fix 1 Therefore, the ground can be excavated with the rotation of the rotating shaft 13. Although the tooth profile of the drilling blades 11 may be used known ones is disposed, for example, a spiral shape
And divide it into multiple pieces. The excavator blade 11 not only excavates, but also plays a role of stirring the excavated soil and the cement milk, and pushing back the mixture of the excavated soil and the cement milk in the tip direction when the excavated and stirred hollow rod 1 is pulled out by reverse rotation.

A stirring blade 12 is fixed around the hollow rotary shaft 13 at the rear of the cutting blade 11. With the wings, the soil and the cement milk can be stirred with the rotation of the rotating shaft 13. The stirring blade 12 includes a plurality of blades, and is arranged in a spiral shape. Drilling wing 11
In the middle position between the excavating blade 11 and the stirring blade 12, an anti-corotating blade having a diameter larger than the diameter of the excavating blade 11 or the stirring blade 12 is arranged around the hollow rod 1 at a position intermediate between the excavating blade 11 and the stirring blade 12. Since the prevention wing is located between the wings 11 and 12, the earth and sand are prevented from rotating together with the rotation of the wing.

<B> Core material 2 The core material 2 is a rod-shaped body having a screw 21 formed as a fixing body at the tip, and the rod-shaped portion is made of reinforcing steel, FRP, carbon fiber.
FRP , steel pipe or the like is used. The core 2 is previously disposed through the hollow portion of the hollow rotary shaft 13, and the screw 21 formed at the tip is exposed to the outside from the tip of the rotary shaft 13. It is particularly desirable that the core material 2 has a high tensile strength, can maintain the strength for a long time, and is hardly oxidized. The core member 2, as described later, while rotating the <br/> core member 2 together with the rotating shaft 13, the screw in the tip of the ground from sediment range excavated stirred - a screwed.

[Operation]

Next, the construction procedure will be described. <B> screw of the core member 2 and a drilling stirred discharge tip - in a state of being exposed and to rotate the rotary shaft 13 of the drill stirring hollow rod 1. Then, the stirring hollow rod 1 moves forward while excavating the ground. On this occasion,
Cement milk is discharged from a discharge port near the tip of the rotating shaft 13. Since the rotating shaft 13 is rotating simultaneously with the discharge,
The excavated soil and the cement milk are stirred by the stirring blade 12. As a result, a large reinforcement 3 having a diameter which is constituted by sand mixed Jiri mortar (soil mortar) is completed in the ground.

<B> At the tip of the core 2Fixed  When the excavation and agitation are completed to the deepest part, the rotation of the rotating shaft 13 is started.
stop.At this timeScrew at the tip of core 2Is the axis of rotation
According to the rotation of 13Bite into the groundDrilling,
At the end of stirringFixed to ground outside the area of improvementWas done
State.

<C> Pulling out the stirring hollow rod 1 Next, do not give the rotating shaft 13 a rotation in the direction opposite to the direction of excavation.
The stirring hollow rod 1 is gradually retracted , and can be pulled out with the core material 2 remaining. At this time, by appropriately adjusting the rotation speed and the drawing speed, the hollow rod 1 can be pulled out in a state where the earth and sand of the improved reinforcing body 3 is compressed toward the tip. In this case, since the core 2 located at the center of the rotating shaft 13 is screwed at the tip, the hollow rod 1 can be pulled out while being accurately located at the center of the reinforcing member 3, and the core 2 can be pulled out. Does not deviate from the center.

< D > Discharge of Cement Milk When the hollow rod 1 is pulled out, the earth and sand becomes insufficient by the volume thereof, and when a cavity is formed in the ground, the surrounding earth and sand is loosened. Therefore, when the hollow rod 1 is pulled out, the cement milk is discharged from near the tip. Then this sema
The milk will compensate for the insufficient volume of earth and sand after the hollow rod 1 is pulled out. Since the cylindrical portion from which the cement milk has been discharged is not agitated, the periphery of the core material 2 forms a central reinforcing column 31 surrounded by high-quality cement milk that does not contain much earth and sand.

<E> Of core material 2Establishment  When the hollow rod 1 is pulled out, the core material with its surroundings reinforced
The tail end of 2 is exposed outside the hole. The tail endKo to build later
Settles inside concrete walls.

【The invention's effect】

The construction method of the present invention is as described above.Was
MeThe following effects can be achieved. <B> The diameter is larger than that of conventional anchors.
Fruit, short length reinforcementTo get enough anchor forceBut
it can. Therefore anchorofChanging the construction positionlong
ThingsCompared to the conventional method of constructing many, Work effectiveness
Good rate.  <B> Don't bring out the earth and sand to be improved
Work can be done. Therefore, railways and roads,
Even when working in a place that is close to a building,
Work safely without danger of subsidence
it can. <C> The improved reinforcement has a high concentration at the center.Semen
TomilkThe central reinforcing column is made of soil and cement milk.
It can be configured as a mixture. Therefore trust
High quality, high quality reinforcements can be built underground
You. <D> At the tip of the core material 2Fixing bodyIs provided. Accordingly
When the hollow rod 1 is retracted, the tip is agitated.
The core material 2 screwed into the unoccupied ground
Can come. As a result, the core material 2 is almost always cylindrical.
It is located at the center of the reinforcing body 3Power
ActIn the event that the tension is transmitted to the ground
HighReinforcement effectCan be obtained. <E> When pulling out the excavation-stirred hollow rod, the rotation speed and
By appropriately adjusting the drawing speed, an improved supplement
With the hollow rod in a state where the strong earth and sand is compressed toward the tip
Can be pulled out. Therefore, even when pulled out
Does not loosen, but instead is compressed and compacted,
A solid reinforcement can be formed. <F> Large diameterTo be, Short in lengthEven enough Ann
Car power is obtainedReinforcement can be installed. As a result, narrow
Easy construction even on sites with limited land and height
be able to.

[Brief description of the drawings]

FIG. 1 is an illustration of a construction method of the present invention.

FIG. 2 is an explanatory view of the construction method of the present invention.

FIG. 3 is an explanatory view of the construction method of the present invention.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukihiko Tamura 2-22-15- 106, Katsuradai, Midori-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Atsuo Fukuda 2-4-1 Akasaka, Minato-ku, Tokyo Inside TENOX CORPORATION (72) Inventor Shigeru Yoshida 2-4-1 Akasaka, Minato-ku, Tokyo Inside Tenox Co., Ltd. (72) Inventor Shuji Ue 2-4-1 Akasaka, Minato-ku Tokyo JP-A-53-145306 (JP, A)

Claims (1)

(57) [Claims] 1. A drilling stirring rod was set <br/> Ke the drilling blade and a stirring blade around a hollow rotary shaft is advanced into the ground, comprising the steps of drilling stirring the stirring soil and cement milk simultaneously, hollow rod Yes disposed through the hollow portion, fixing the tip
Rotating the core made of a rod-shaped body that forms the body , inserting the core into the ground outside the excavated and stirred earth and sand, and rotating the hollow rod in the reverse direction while leaving the core at the center, from the tip Removing the cement milk from the ground while discharging the cement milk , and a method for reinforcing the ground using a large-diameter tensile reinforcement.