JPH0431347Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to an auger-type excavator that excavates diagonally, mainly to construct continuous walls underground.

``Problems that cannot be solved by conventional techniques and ideas'' There have been examples of constructing diagonal piles as single piles using an auger excavator, but there have been no examples of constructing diagonal walls as continuous walls.

Generally, when constructing diagonal piles using an auger type excavator, the driving angle of the diagonal pile is determined by adjusting the angle of the leader, so it is difficult to know the actual angle of the auger in the ground. Therefore, it is impossible to confirm the construction accuracy.

Therefore, even if it were possible to construct a diagonal wall using a conventional multi-spindle auger excavator, there is a high possibility that it would not be a continuous wall because the construction accuracy cannot be controlled.
Currently, there is no way to confirm this.

By the way, in actual diagonal drilling construction using a multi-axis auger excavator, the auger is deflected during excavation, so even if the inclination of the leader is accurate, the drilled hole is often curved, especially when the drilling depth When the excavator is deep, the cumulative amount of deflection of the auger increases, and the amount of deviation of the pile (deviation in the direction of inclination with respect to the pile core) tends to increase. It is desirable to install the inclinometer at the tip of the auger, but if the stirring blade is installed over a fairly long area of the tip of the excavation shaft, such as an auger, an inclinometer should be installed at this tip. It's not easy.

On the other hand, conventionally, in an improved machine for soft ground that has a stirring blade only at the tip of the rotating shaft, a measuring tube with both ends supported on spherical bearings is installed in the center of the improved machine, and an inclinometer is attached to the upper end of this measuring tube. A technique is known that measures the deflection of the improved machine as well as the inclination in the digging direction, but it is difficult to install such a measuring tube on a multi-shaft auger equipped with stirring blades over a long range. Have difficulty.

"Means for solving the problem" This invention aims to solve the above-mentioned conventional problem.
By installing an inclinometer that converts the inclination angle into an electrical signal and transmits it so that it can be adjusted in the direction of the deflection angle of the excavation shaft, the inclination angle of the excavation shaft can be adjusted to correspond to excavation construction at any inclination angle. Or an auger-type excavator that continuously and automatically measures torsion, confirms and corrects inclination angle and torsion one by one, maintains accuracy, and reliably excavates, ensuring construction accuracy for sloped walls, etc. This is what we propose.

``Example'' Below, an example of the three-axis auger shown in the drawings will be described. A leader 3 whose upper part is supported by a support arm 2 is installed on the crawler 1 so that the angle can be adjusted freely. A rotary power device 5 that is raised and lowered by a cable 4 is slidably installed.

There are three sockets 6 at the lower end of the rotary power device 5.
A rotation drive mechanism 7 is provided in which the center and left and right sides rotate in opposite directions, and each socket 7 has a digging shaft 8a, 8b, 8c made of a double pipe.
has been concluded.

A drilling bit 9 is attached to the lower end of each of the drilling shafts 8a, 8b, 8c, and two pairs of interference prevention fittings 10a, 10b and 11a, which are vertically spaced apart from each other by a small distance, are provided below the middle. 11b, and an interference prevention fitting 12 is further provided at a predetermined position above.

Between the upper and lower interference prevention fittings 10a, 10b arranged near the lower ends of the excavation shafts 8a, 8b, 8c, there is an inclinometer protector installed inside to protect the inclinometers 13, 13' from vibration and impact. Case 1
4 and 14' are mounted in parallel between the excavation shafts 8a, 8b and 8b, 8c so as to be adjustable in angle.

The inclinometers 13 and 13' are two-way inclinometers that simultaneously measure the inclination angles of two components perpendicular to each other so that the measurement directions are shifted by 90 degrees, and convert the measured values into electrical signals for transmission. .

Here, the reason why two inclinometers are used is to measure the torsion angle of the auger based on the difference between the measured values by both inclinometers.

The protective cases 14, 14' are rotatably mounted at the center by a pivot 16 between a pair of left and right mounting plates 15, 15 fixed between interference prevention fittings 10a, 10b, respectively, and both upper and lower ends are attached to this. The attached slide fixing fittings 17, 17' made of bolts, nuts, etc. are slidably engaged with arc-shaped guide holes 18, 18 whose center of curvature is the pivot 16 provided at the upper and lower parts of the mounting plates 15, 15. After adjusting the rotation to a predetermined angle, it can be fixed to the mounting plates 15, 15. The power transmission cord 19 of the inclinometers 13, 13' is connected to a cord protection pipe 20a installed along the excavation shaft 8b between the interference prevention fitting 10a and the interference prevention fitting 11b above it, and to the cord protection tube 20a, which is separated from its tip to the left and right for excavation. Cord protection tube 20b installed along the shafts 8a, 8c to reach the center of the upper interference prevention fitting 11a, and further inside the protection tube 20c installed along the excavation shaft 8b to reach its upper end. After passing through the sensor, it is connected to various equipment such as a detection device or a computer in the operator's room.

Each excavation shaft 8 below the interference prevention fitting 10b
On the outer periphery of a, 8b, 8c, excavation shafts 8a, 8b,
A large number of stirring blades 21 are attached to stir the cement, bentonite milk, and soil at the current location discharged from the tip of the shaft 8c.

Further, on the outer periphery of the excavation shafts 8a, 8b, 8c above the interference prevention fitting 10b, as shown in FIG.
A large number of stirring blades 21 are attached alternately to the left and right excavation shafts 8a, 8c and the central excavation shaft 8b in a staggered manner, except for the parts where a, 20b, 20c are arranged close to each other. By arranging the totals 13, 13' and their wiring cords 19 close to each other, the agitation performance is ensured in the upper portion where the agitation blades 21 cannot be installed.

"Operation of the invention" When drilling a hole at a predetermined angle (θ) in order to construct a sloped wall or the like using the auger excavator having the above configuration, the protective cases 14, 14' are attached to the excavation shaft 8a,
8b and 8c are fixed at an angle of θ as shown in FIGS.
is 0°).

Then, in this state, the excavation shafts 8a, 8b, 8c are tilted by an angle θ with respect to the vertical axis, and the inclination of the inclined dies 13, 13 is continuously measured while drilling holes diagonally one after another. Therefore, when the excavation shafts 8a, 8b, 8c are digging while maintaining their set inclination angles θ, the measured values of the inclinometers 13, 13 are 0, and the inclinations of the excavation shafts 8a, 8b, 8c are If the angle θ has an error by the deviation angle θ′ during excavation as shown in Figure 7,
The inclinometers 13, 13 are also inclined by the deviation angle θ' with respect to the vertical direction, and such measurement data is sequentially transmitted as a signal.

The measurement data of the inclinometers 13, 13' measured in this way is inputted sequentially to a deviation meter installed in the operator's room, and the deviation angle θ' and torsion angle near the tips of the excavation shafts 8a, 8b, 8c are measured. By providing an analog display on the displacement meter, the work can be carried out while reliably maintaining the accuracy of the inclination angle θ while appropriately controlling the excavation speed and direction according to the deviation angle θ' and torsion situation.

Further, the measurement data of each shift angle θ' is inputted to the computer after being A/D converted. Then, the computer integrates these data in the depth direction to calculate the amount of deviation of the excavation axis (the amount of deviation from the standard excavation direction), and calculates this amount of deviation and deviation angle θ'.
It is displayed on the CRT display, and after the completion of all the processes of sloping wall construction, the plotter is used to graphically confirm the lap situation of the slanted wall at depth, and the coordinates of the center axis of the column piles of each construction element are calculated. Find unlapsing points in between.

If an unwrapped area is found, consider the intended use of the sloped wall, and if water-stopping properties are particularly required, perform backside treatment such as injecting a chemical solution.

Further, the measurement data of the deviation angle θ' is continuously recorded by a self-recording device in correspondence with the digging speed and withdrawal speed of the auger, and the digging state is managed.

Incidentally, the inclinometers 13, 13' are connected to each excavation shaft 8a,
Because it is necessary to measure the deviation angle θ' and torsion angle of 8b and 8c as close to the tips as possible, the stirring blades 21 are installed near the tips and the part where the power transmission cord 19 is placed. However, by alternately providing parts without stirring blades on each excavation shaft and wiring the power transmission cord of the inclinometer along the parts without stirring blades, the stirring performance above the part where the inclinometer is installed can be improved. This makes it possible to ensure an even distribution of material and enable good excavation or extraction.

In addition, inclinometers 13, 13' and power transmission cord 19
is within the excavation and stirring range, and the protective case 1
4, 14' and cord protection tubes 20a, 20b, 2
Since they are protected by 0c, their damage can be prevented.

In this way, with the auger type excavator of this invention, it is possible to construct a sloped wall with high precision while checking the slope angle accuracy. It is possible to reduce the active earth pressure compared to the construction site, and it is also possible to easily construct impermeable waterway walls and protective walls for underground structures. It can be easily constructed as a wall.

``Effect of the invention'' As described above, according to this invention, a stirring blade is provided for a multi-shaft auger type excavator, which is provided with a stirring blade over a fairly long range at the tip of the excavation shaft. An inclinometer can be reliably installed at the tip, thereby making it possible to accurately measure the deviation angle and torsion angle in the excavation direction, including the deflection of the excavation shaft.

When diagonally excavating using a multi-axis auger type excavator, an inclinometer set perpendicular to the inclination angle of the excavation axis is used to directly and accurately measure the deviation angle and torsion angle of the excavation axis in the excavation direction. It becomes possible to carry out excavation construction with high inclination angle accuracy and less twisting while correcting and controlling the excavation direction based on the measured data.

Therefore, for example, when constructing a sloped wall as a column-type underground continuous wall, the data on the deviation angle and torsion angle with respect to the slope angle can be processed by computer, since the construction can be performed while checking the inclination angle accuracy of the column pile. As a result, the amount of deviation of the excavation axis can be quickly obtained, and by aggregating the data for each construction element, it is possible to confirm the construction accuracy of the sloped wall.

Since it is possible to check in advance before excavating the ground where the elements do not overlap, back surface preparation can be carried out at an early stage if necessary.

In addition, the inclinometer can be adjusted to any angle, so
It can be applied to excavation construction at any slope angle.

[Brief explanation of the drawing]

Figure 1 is a front view showing an embodiment of this invention, Figure 2 is a front view showing an embodiment of this invention.
The figures are the same side view, Fig. 3 is an enlarged front view of the inclinometer installation part, Fig. 4 is the same side view, Fig. 5 is the same cross-sectional plan view, Fig. 6 is a side view showing the state of use, and Fig. 7 is an enlarged side view of the same main part. 8a, 8b, 8c...Drilling shaft, 10a, 10b
...Interference prevention fitting, 13, 13' ... Inclinometer, 1
4, 14'... Inclinometer protective case, 15... Mounting plate, 16... Pivot, 17, 17'... Slide fixing bracket, 18... Guide hole, 19... Power transmission cord, 20a, 20b, 20c... ...cord protection tube,
21... Stirring blade.

Claims (1)

[Scope of Claim for Utility Model Registration] A portion without stirring blades is provided around the excavation shaft at the tip of an excavator, and a plurality of excavation shafts are integrally and rotatably supported above and below the portion of the excavation shaft without stirring blades. An inclinometer that converts the inclination angle into an electric signal and transmits it is attached to the mounting plate fixed between the upper and lower interference prevention fittings, and the angle of the inclinometer that converts the inclination angle into an electric signal and transmits it can be freely adjusted in the direction of the deflection angle with respect to the excavation shaft. Installation, each excavation shaft above the installation part of the inclinometer is provided with a portion without stirring blades alternately, and the power transmission cord of the inclinometer is wired along the portion of the excavation shaft without stirring blades. An auger-type excavator for diagonal excavation. An auger type excavator for diagonal excavation according to claim 1, wherein the inclinometer is loaded in a protective tube. The auger type excavator for diagonal excavation according to claim 2, wherein the protective tube is attached to the mounting plate so as to be adjustable in angle.