JP2899671B2 - Continuous drilling soil cement wall method and construction excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous excavation soil cement wall method and a construction excavator used therefor.

[0002]

2. Description of the Related Art Conventionally, simple steel sheet piles have been used for earth retaining walls in a shallow digging method. However, since vibration and noise generated by driving steel sheet piles have a large effect on a third party, they have recently been used. Then, the construction of soil cement wall as a retaining wall is increasing.

[0003] Regarding the construction of this soil cement wall, a conventional method for constructing a soil cement wall which has low vibration and low noise on a narrow road with many houses and is excellent in preserving the roadside environment is shown in FIG. An auger rod 2 is used in which a horizontal arm 1 having such a bit 1a planted thereon is provided in a plurality of stages so as to be longer at an upper end of the arm.

The auger rod 2 is provided with a swivel 4 at the upper end as shown in FIG. 10 so that cement paste can be poured out from the tip. The auger rod 2 is attached to the base machine 3 and firstly as shown in FIG. The mortar pile is formed by a single pile one by one while rotating and piercing and then pulling up the cement paste while injecting and stirring. In FIG. 10, 5 is a generator, 6 is an improved material constituting a cement paste, 7 is a mixer, 8 is an injection pump, and 9 is an automatic recorder.

[0005] As shown in Fig. 12, the mortar pile is formed into a wall shape as a mortar column-shaped wall by overlapping the ends of the single pile.

[0006]

The mortar column-shaped wall has a large number of joints due to the pile of single piles, and the wall thickness of this portion is small, so that cracks are generated in the joints and cause water leakage. In addition, since the wall thickness of the joint part is small, the strength of the entire wall is small, and since the wall surface is uneven, the bonding area of the mortar pile and the mortar pile is small, and there is a difference between those that hit the belly and those that do not hit as a single pile The piles are displaced due to sticking and the like, which easily causes cracks and water leakage. Further, since the single piles are constructed one by one, workability (efficiency) is poor.

[0007] Regarding the problem of the last workability, if a multi-spindle machine in which multi-stake pile driving machines such as a tri-shaft are used is used, it is possible to construct a single pile at the same time (three pieces). However, even in this case, joining of the preceding element and the succeeding element is necessary, and it cannot be said that continuous construction is possible.

[0008] There is also a construction method called a trader construction method in which a trench excavator using a large chain saw is enlarged, excavated using a bentonite solution and aeration together, and after completion, is stirred and mixed while injecting a cement paste. Since this is determined according to the depth of the excavation of the trench excavator with a large chain saw, it becomes quite large and heavy, the whole machine also becomes large, and the chain saw is a vertical drilling machine, Due to the movement of earth and sand, there is a problem that excavated earth remains on the ground.

An object of the present invention is to solve the above-mentioned disadvantages of the conventional example, and to use a device which can be installed even in a narrow place, and is a small device similar to a device used in a conventional single-shaft mortar column method. In addition, the wall pressure to be applied becomes uniform, the joint part is minimized or eliminated as much as possible, it is possible to construct a uniform retaining wall with uniform strength, no water leakage,
An object of the present invention is to provide a continuous excavation soil-cement wall method and an excavator for construction, which have good workability.

[0010]

In order to achieve the above object, the present invention provides a continuous drilling soil cement wall method, which comprises a drilling head at a tip and a side portion of an auger rod from which cement paste can be poured. Is provided with a drill bit at the tip to project a stirring blade that enables drilling.The stirring blade is arranged at appropriate intervals in the rod length direction to a length that satisfies the planned depth. Using a continuous drilling soil cement wall construction excavator equipped with a screw blade for raising the paste, cut the ground to the planned depth and simultaneously agitate the cement paste, and transfer the excavator to a base machine such as a crawler. While excavating the ground at this transfer point continuously while transporting it in the horizontal direction with a machine, the cement paste was injected and stirred together with this excavation, and soil cement was excavated. It is an Abstract that reclamation continuously walls.

[0011] Further, as an excavator for construction of a continuous excavation soil cement wall, an excavation head is provided at a tip, and a drill bit is provided at a tip of a side portion of an auger rod from which cement paste can be poured out. The stirrer blades that were made to protrude were arranged at appropriate intervals in the rod length direction to a length that satisfies the planned depth, and screw blades for raising cement paste were provided on the rod peripheral surface. It is the gist.

According to the present invention, drilling, cement paste injection, stirring, and movement can be performed simultaneously, so that the time required for moving and setting the apparatus is greatly reduced as compared with the prior art. Further, the stirring time required at the time of drawing can be slightly reduced, so that the working time can be shortened.

[0013] Further, since the soil cement wall is continuously constructed, the joint portion becomes only the construction seam.
As a result, the wall surface has less or little joints as compared with the related art, and almost no water leaks from the joints, thus increasing the water stopping performance.

[0014] Further, the strength is increased due to the integral wall without joints. In addition to this, since the wall surface is smooth, the bonding area between the wall surface and the bulging steel material is increased, and a stable retaining wall is obtained.

Since the excavator is constructed with a base machine of almost the same level as that of the conventional single pile construction,
It is possible even in a confined area, and it is the same as before that it has low noise and vibration and is excellent in environmental protection.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of a continuous excavation soil cement wall method according to the present invention, in which the same components as those in FIG. 10 showing the conventional example are denoted by the same reference numerals.

First, the excavator according to the present invention will be described. The present invention also comprises an auger rod 2 mounted on a base machine 3 for rotary drilling, which has a drilling head 10 at the tip and a swivel 4 at the upper end. In addition, the cement paste can be poured out from the tip. As before, 5 is a generator, 6 is an improved material constituting a cement paste, 7 is a mixer, 8 is an injection pump, and 9 is an automatic recorder. FIG.
Shows details of the base machine 3, which is a crawler type.

As shown in FIGS. 2 to 4, the auger rod 2 has a horizontal blade-like agitating blade 11 projecting from a side portion thereof. I have. Further, the stirring blades 11 are arranged at appropriate intervals in the length direction of the auger rod 2 to a length that satisfies the planned depth of construction, and are arranged radially in a plane.

A screw blade 13 for raising the cement paste is provided on the peripheral surface of the auger rod 2.

The examples shown in FIGS. 2 to 4 are provided with the drill bit 12 and the stirring blade 11 of 1 to 0.2 passes with respect to the formation depth of the soil cement wall.
-There is a space above and below the stirring blade 11. FIG. 4 shows the details of the drill bit 12.

On the other hand, assuming that the auger rod 2 is provided with a drill bit 12 of 1-pass or more (a bit hits the entire surface of the drill hole in one rotation) and a stirring blade 11, FIGS.
It is also possible not to leave a vertical interval as shown in FIG.

Next, the continuous excavation soil cement wall construction method of the present invention using such an excavator using the auger rod 2 will be described. In the present invention, the injection, agitation, and movement of the drilling / cement paste are simultaneously performed, and the auger rod 2 involves excavation work in the horizontal direction. Therefore, a model having a larger torque than that of the conventional single pile construction is selected. . Similarly, the rod diameter was increased to oppose the horizontal force. In the case of a ground with a small cutting resistance, it is not necessary to select a model having a larger torque than that of such a single pile construction.

The horizontal movement is preferably a continuous movement in accordance with the construction speed of the soil cement wall. However, the movement in the horizontal direction is 1 to the formation depth of the soil cement wall shown in FIGS.
In the case of the auger rod 2 provided with the excavation bit 12 and the stirring blade 11 of 0.2 passes, a portion where the excavation bit 12 does not hit the ground (excavation is not performed) occurs. Is moved up and down by 20 to 30 cm to cut the entire cross section. It is more convenient that the auger rod 2 is moved up and down periodically with a timer.

While excavating the entire cross-section by the above-mentioned vertical movement, the crawler of the base machine 3 moves in the lateral direction at a speed of 10 to 20 cm / min. This vertical movement is only for one span of the stirring blade 11, but the cement paste is
And uniformly stirred.

As for this cement paste,
Cement milk of the same material and composition as the conventional example may be used, but an admixture (bentonite and an AE agent) for improving the fluidity of the excavated soil is added to and mixed with the cement milk in order to alleviate the resistance to excavation in the horizontal direction. Is also good.

By repeating such operations, a soil cement wall A without a continuous joint as shown in FIG. 8 is formed. In FIG. 1, α is the construction performed yesterday, β is the construction performed on the day, and γ is the original ground.

On the other hand, when the auger rod 2 is a one-pass as shown in FIGS. 5 and 6, the bit hits the entire surface of the drill hole in one rotation, and there is no remaining portion to be drilled. What is necessary is just to move in the wall direction (lateral direction) without performing.

As a transfer device for moving the auger rod 2 laterally, other types of base machines, jacks, etc. may be used in addition to the base machine 3 such as the crawler. Furthermore, a form in which an excavator that rotationally drives the auger rod 2 is mounted on a rail track or the like and moved in the lateral direction is also conceivable.

[0029]

As described above, the continuous excavation soil-cement wall construction method and construction excavator of the present invention requires only a small device similar to that of a conventional single pile, and has a narrow space. It is possible even in a place, and has low noise and vibration, and is excellent in environmental protection.

The soil cement wall to be constructed has a uniform wall pressure, a joint having as little stiffness and a uniform strength as possible, and is free from water leakage. Further, since the wall surface is smooth, the bonding area between the wall surface and the steel material which is bulged is obtained. Becomes large, and it becomes a stable retaining wall.

Moreover, drilling, injection of cement paste,
Stirring and moving can be performed simultaneously, so that the time required for moving and setting the apparatus is greatly reduced as compared with the conventional one, and the stirring time required for pulling out can be slightly shortened. High workability can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a continuous excavation soil cement wall method of the present invention.

FIG. 2 is a front view showing a first embodiment of an excavator used in the continuous excavation soil cement wall method of the present invention.

FIG. 3 is a front view of a main part showing a first embodiment of an excavator used in the continuous excavation soil cement wall method of the present invention, in which screw blades are omitted.

FIG. 4 is a detailed view of an excavation bit showing a first embodiment of an excavator used in the continuous excavation soil cement wall method of the present invention.

FIG. 5 is a front view showing a second embodiment of an excavator used in the continuous excavation soil cement wall method of the present invention.

FIG. 6 is a detailed view of a drill bit portion showing a second embodiment of an excavator used in the continuous drilling soil cement wall method of the present invention.

FIG. 7 is a side view of the base machine.

FIG. 8 is a plan view showing a construction state of a soil cement wall according to the present invention.

FIG. 9 is a front view showing a conventional excavator.

FIG. 10 is a side view showing a conventional construction apparatus.

FIG. 11 is an explanatory view showing a construction method of a conventional example.

FIG. 12 is a plan view showing a construction state of a soil cement wall in a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Arm 1a ... Bit 2 ... Auger rod 3 ... Base machine 4 ... Swivel 5 ... Generator 6 ... Improved material 7 ... Mixer 8 ... Injection pump 9 ... Automatic recorder 10 ... Drilling head 11 ... Stirring blade 12 ... Drilling bit 13 … Screw blade

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) E02D 5/18-5/20 E02F 5/02-5/04 E21B 7/00 E02D 3/12

Claims (2)

(57) [Claims] An agitating blade which has a drilling head at a tip thereof and is provided with a drilling bit at a tip thereof and which is capable of drilling is provided at a side portion of an auger rod from which cement paste can be poured out. Stirring blades are arranged at appropriate intervals in the rod length direction to a length that satisfies the planned depth, and a continuous drilling soil drilling machine with a screw blade for raising cement paste is provided on the rod peripheral surface. While cutting the ground to the depth and simultaneously stirring the cement paste, the ground at this transfer point is continuously excavated while the excavator is laterally transferred by a transfer machine such as a base machine such as a crawler. A method for constructing a continuously excavated soil cement wall, characterized by continuously forming a soil cement wall by injecting and stirring cement paste. 2. An auger rod having a drilling head at a tip thereof, and a stirring blade which is provided with a drilling bit at a tip thereof and capable of drilling is protruded from a side portion of an auger rod from which cement paste can be poured out. Stirring blades are arranged at appropriate intervals in the rod length direction to a length that satisfies the planned depth, and screw blades for raising cement paste are provided around the rod surface. Machine.