JPH033633Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial Application Field" This invention relates to an auger type excavator, particularly a structure in which an inclinometer is installed therein.

``Problems that conventional techniques and ideas cannot solve'' Conventionally, when constructing single piles or column piles using an auger type excavator, the vertical accuracy of the excavated hole was controlled using a hole drill (three-point pile driver). ) is done indirectly by checking the verticality of the leader using instruments, transits, etc., and is therefore based on the assumption that the verticality of the leader of the excavator determines the verticality of the auger during excavation. Excavation is underway.

However, in reality, the auger is deflected during drilling, so even if the leader is vertical, the drilled hole is often curved. Especially when the drilling depth is deep, the cumulative amount of auger deflection becomes large. Amount of pile deviation (horizontal deviation from the pile core)
tends to become larger.

Therefore, it is difficult to strictly control the vertical accuracy of the drill hole using the conventional method of ensuring the verticality of the drill hole by controlling the verticality of the leader of the drilling machine.

In addition, there is currently no way to check the accuracy of single piles or column piles constructed with an auger excavator other than by actually excavating and examining them.

However, the following problems arise due to the inability to measure and confirm vertical accuracy.

First of all, if the borehole bends significantly during excavation during construction, the load on the auger may increase and the hole may become impossible to drill, and the stressed material inserted into the borehole may protrude into the ground and get caught. In some cases, insertion may be difficult or impossible, and in either case, re-excavation is required, causing problems such as delaying the process.

On the other hand, during construction, for example, in the case of a column-type underground continuous wall, if the excavation hole has a large bend, an upline between the elements will occur and water will come out when excavating the earth and sand around the continuous wall, causing damage to the surrounding area. This can lead to disasters such as well drying, ground consolidation subsidence, and the collapse of the ground behind them.

In addition, in the case of a mountain retaining wall, if the excavation hole is bent and it is digging into the back side, the amount of excavated soil will increase, causing a delay in the process, and if the sheath is digging into the excavated side, it will cause damage inside the mountain retaining The clearance with the structure to be installed will be disturbed, leading to problems such as the structure becoming insufficient and workability worsening.

By the way, in conventional deep soft ground improvement machines,
It is known that an inclinometer is attached to a support tube with multiple stirring shafts attached to the outer periphery (Japanese Patent Application Laid-Open No. 1983-1999).
48016), the stirring blades are located below the lower end of the support tube, so there are no members on the support tube that would obstruct the installation of the inclinometer, and installation is easy. It is not easy to install an inclinometer if the stirring blade is provided over a fairly long area at the tip.

"Means for solving the problem" This invention aims to solve the above-mentioned conventional problem.
A plurality of pairs of upper and lower interference prevention fittings that integrally and rotatably support the excavation shafts are provided at predetermined intervals vertically near the tips of the plurality of excavation shafts, and between the pair of interference prevention fittings located on the lower side. In between, inclinometers were installed parallel to each other along two excavation axes without stirring blades, and inclinometers were installed alternately on each excavation axis between each interference prevention fitting above the part where the inclinometer was installed. The present invention proposes an auger type excavator in which a portion without stirring blades is provided and a power transmission cord of the inclinometer is wired along this portion without stirring blades.

"Operation" Since the inclinometers are installed parallel to each other along the two excavation shafts with no stirring blades between them between the pair of interference prevention fittings, the inclinometers can be installed without interfering with the rotation of the excavation shafts. In addition, sections without stirring blades are provided alternately on each excavation axis between the interference prevention fittings above the part where the inclinometer is installed, and the power transmission of the inclinometer is carried out along the parts without stirring blades. Since the cord is wired, the power transmission cord can be wired without interfering with the rotation of the excavation shaft.

Since the portions without stirring blades are provided in a short range and are alternately provided for each excavation shaft, it is possible to ensure uniform excavation of each excavation shaft with almost no effect on the excavation performance of the stirring blades.

Therefore, the bending or torsion of the excavation shaft can be continuously and automatically measured using the data obtained by converting the inclination angle into an electric signal using an inclinometer, which was not previously installed in an auger excavator. It becomes possible to accurately maintain vertical accuracy and reliably excavate while correcting torsion.

"Embodiment" Below, an embodiment of the three-axis auger of this invention shown in the drawings will be described. A leader 3 whose upper part is supported by a support arm 2 is vertically established on the crawler 1, and a lifting cable 4 is attached to the leader 3. A rotary power device 5 that is moved up and down by means of a rotary power device 5 is slidably installed.

Three sockets 6 are provided 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 attached to the intermediate lower force. 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, 14' are mounted parallel to each other along excavation shafts 8a, 8c located on both sides.

The inclinometers 13 and 13' are two-way inclinometers that simultaneously measure the inclination angles of two mutually orthogonal components 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 power transmission cord 15 of the inclinometers 13, 13' includes a cord protection pipe 16a installed along the excavation shaft 8b between the interference prevention fitting 10 and the interference prevention fitting 11b above it, and a cord protection pipe 16a installed along the excavation shaft 8b from the tip, and a cord protection tube 16a attached to the excavation shaft separated from the tip to the left and right. 8a,
The cord protection tube 16b was installed along the axis 8c to reach the center of the upper interference prevention fitting 11a, and the cord protection tube 16c was further installed along the excavation shaft 8b to reach its upper end. At the top, 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 17 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 17 are attached to the left and right excavation shafts 8a, 8c and the central excavation shaft 8b alternately in a staggered manner, except for the parts where a, 16b, 16c are arranged close to each other. By arranging the totals 13, 13' and their wiring cords 15 close to each other, it is configured to ensure stirring performance in the upper portion where the stirring blades 17 cannot be placed.

When using the auger type excavator having the above configuration, the inclination angle is continuously measured while drilling a hole in the ground or while pulling out the hole after drilling.

In this case, the inclinometers 13, 13' are connected to each excavation axis 8.
Since it is necessary to measure the inclination angle and twist angle as close as possible to the tips of the a, 8b, and 8c, stirring blades 17 are installed near the tips of the a, 8b, and 8c, and the stirring blades 17 are installed in the installation portion and the portion where the power transmission cord 15 is placed. However, stirring blades 17 cannot be provided in the installation part where the power transmission cord 15 is installed and the part where the power transmission cord 15 is placed.
Each excavation shaft is alternately provided with parts without stirring blades, and the power transmission cord of the inclinometer is wired along the parts without stirring blades to ensure uniform stirring performance above the part where the inclinometer is installed, resulting in good performance. It becomes possible to excavate or pull out.

In addition, inclinometers 13, 13' and power transmission cord 15
is within the digging and stirring range, and the protective case 1
4, 14' and cord protection tubes 16a, 16b, 1
6c, their damage can be prevented.

In this way, each measurement data of the inclinometers 13, 13' is sequentially input to the deviation meter installed in the operator's room, and the inclination angle and torsion angle near the tip of the excavation shafts 8a, 8c are displayed in analog on the deviation meter. By doing so, the work can proceed while reliably maintaining vertical accuracy while appropriately correcting the excavation direction according to the inclination angle and torsion situation.

Further, the measurement data of the angle of inclination is inputted into the computer after being converted from analog to digital. Then, a computer integrates these data in the depth direction to calculate the deviation of the excavation axis, displays this deviation and inclination angle on a CRT display, and displays it on a plotter after all processes of continuous wall construction are completed. The lapping situation of a continuous wall at depth is illustrated.

Furthermore, the measurement data of the inclination angle 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.

``Effects of the invention'' As described above, according to this invention, inclinometers are installed parallel to each other between a pair of interference prevention fittings along two excavation shafts with no stirring blades between them.
The inclinometer can be installed without interfering with the rotation of the excavation shaft, and portions without stirring blades are alternately provided on each excavation shaft between the interference prevention fittings above the part where the inclinometer is installed. Since the power transmission cord of the inclinometer is routed along the part where there is no stirring blade, the power transmission cord can be similarly routed without interfering with the rotation of the excavation shaft.

Further, since the portions without stirring blades are provided in a short range and are alternately provided for each excavation shaft, it is possible to ensure uniform excavation of each excavation shaft with almost no effect on the excavation performance by the stirring blades.

Then, the inclination angle and torsion angle are continuously measured using two inclinometers in the multi-axis auger excavator, and excavation construction with high vertical accuracy can be performed while correcting the excavation direction based on this measurement data. becomes.

Therefore, when constructing a column-type underground continuous wall, for example, the vertical accuracy of the column piles can be checked during construction, which prevents the inability to drill or insert stress materials due to bends in the excavation hole. It is possible to prevent the occurrence of such a situation, and it is possible to improve workability.

In addition, by improving the vertical accuracy of column piles, the occurrence of element unlaps is reduced, and the water-stopping performance of underground continuous walls is improved, thereby preventing drying of surrounding wells, consolidation subsidence of the ground, and collapse of the ground. Disasters can be prevented from occurring, and since the location of unlap occurrence can be known before root cutting begins, backside care can be performed effectively when injecting a chemical solution.

Furthermore, with the improvement of the vertical accuracy of column row piles, the accuracy of erecting stress materials has been improved, making it possible to prevent insufficient strength of mountain retaining walls caused by uneven pitches of stress materials, and to improve underground continuity. The amount of digging into the back side of the wall is reduced, reducing over-digging and ensuring accurate clearance with internal structures.

[Brief explanation of drawings]

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, Figure 3 is an enlarged front view of the inclinometer installation part, Figure 4 is the same side view, Figure 5 is the same cross-sectional plan view, and Figure 6 is a side view of the cord protection tube installation part. be. 8a, 8b, 8c...excavation shaft, 10a, 10
b, 11a, 11b...interference prevention fitting, 13, 1
3'... Inclinometer, 14, 14'... Inclinometer protective case, 15... Power transmission cord, 16a, 16b, 16
c... Cord protection tube, 17... Stirring blade.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A plurality of pairs of upper and lower interference prevention fittings that integrally and rotatably support the excavating shafts are provided near the tips of the plurality of excavating shafts at predetermined intervals vertically; between the pair of interference prevention fittings located at
In between, inclinometers are installed parallel to each other along the two excavation shafts without stirring blades, and stirring blades are placed alternately on each excavation shaft between each interference prevention fitting above the part where the inclinometers are installed. An auger type excavator characterized in that a part without stirring blades is provided, and a power transmission cord of the inclinometer is wired along the part without stirring blades. 2. The auger according to claim 1 of the utility model registration claim, characterized in that the inclinometer is loaded in a protective tube fixed between interference prevention fittings arranged above and below a portion near the tip of the excavation shaft. type excavator. 3. The auger type excavator according to claim 2, wherein the power transmission cord is inserted through a protection pipe.