JP3318064B2 - Underground diaphragm wall excavator position detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects a position of an underground continuous wall excavator in order to control the course of the underground continuous wall excavator when hanging and excavating vertically from the ground. It concerns the device.

[0002]

2. Description of the Related Art Generally, an underground diaphragm excavator E is shown in FIG.
As shown in (1), it is hung from a support such as a crane with a suspension wire W, and digs vertically downward. At this time, the underground diaphragm excavator E is slightly displaced in the horizontal direction and the excavation hole is inclined. In order to prevent this, a position detector of the underground continuous wall excavator E is conventionally detected by a position detecting device such as A, B, or C shown below, and the underground continuous wall excavator E is detected. I control the course.

The conventional position detecting device of the underground wall excavator E is as follows: A: See FIG. 7A. The inclinometer 14a pivotally supported in the X and Y directions and having a wire 17 connected to a lower end thereof has a wire. 17 is measured, and the length of the wire 17 sent out by the depth measuring device 18 is measured.
Is calculated. B: See (B-1) and (B-2) of FIG. 7 The displacement amount of the wire 17 at a fixed distance from the fixed point O of the wire 17 is measured by the displacement meter 14b, and this is determined according to the wire length. Then, the position of the underground diaphragm excavator E is calculated by multiplying proportionally.
(Depending on the method of attaching the wire 17 to the underground excavator E, there are two types (B-1) and (B-2). C: See FIG. 7 (C). Weight and sensor 1
The position of the underground diaphragm excavator E is measured by the sensor 4c1 and the sensor 14c2 attached to the underground diaphragm excavator E. In the figure, 10 is a measuring stand, 20 is a pulley, 21
Indicates an inclinometer.

[0004]

However, the conventional position detecting device has the following problems and features. A: A relatively simple wire inclination measuring method, and a measuring stand 10
There is a feature that does not affect the wire tilt angle even if there is a tilt error at the time of installation. However, there is a disadvantage that the inclination of the wire 17 is not easily transmitted to the inclinometer. This tendency is particularly remarkable when the change in the wire inclination angle is small. In the embodiment, it is difficult to accurately detect the inclination angle corresponding to the positional deviation at a large depth of 100 m or more.
The wire inclination angle is about 1 when there is a 5cm hole bend.
Minutes. B: When the attachment point O of the wire 17, which should be a fixed point, to the measurement gantry 10 moves due to deformation of the measurement gantry 10, the amount of movement is proportionally multiplied and affects a position detection error. With the movement of the excavation position (always in underground wall construction)
Although the measurement gantry 1 is moved, the inclination error in the installation of the measurement gantry 10 at this time is also proportionally multiplied as a position detection error similarly to the above. C: There is a disadvantage that the weight / sensor 14c1 hanging in the stabilizing liquid is likely to be shaken by the flow of the stabilizing liquid.

Therefore, the present invention can be applied to a large depth of about 150 m in which a means for accurately measuring a small amount of angle change is provided while taking advantage of the simplicity of method A among the above conventional methods. It is an object of the present invention to provide an underground diaphragm excavator position detecting device.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a measuring stand 10 fixed on the ground is provided.
A locking member 13 is provided so as to be tiltable, and a rod 15 integrally attached with a tilt measuring device 14 is fixedly hung below the locking member 13, and an underground continuous wall excavator E is mounted from the lower end of the rod 15.
Pulley 20 and guide pulley 19 for measuring stand 10
Is provided with a wire 17 reaching the winch 16 driven by the torque motor 16a while maintaining a predetermined tension, and an underground continuous wall excavator E is provided with an inclinometer 21 for detecting the inclination angle thereof, and is sent out from the winch 16. A depth measuring device 18 for measuring the length of the wire 17 was installed to constitute a position detecting device of the underground continuous wall excavator.

[0007]

The incline measuring device of the present invention uses an underground diaphragm excavator E
Is displaced from the vertical line P (see FIG. 4) and displaced in the horizontal direction, the rod 15 is inclined via the wire 17. This inclination angle is detected by the inclination measuring device 14, while the excavation depth is detected by the wire 1 sent from the winch 16.
7 is measured by the depth measuring device 18. The position of the head of the excavator E is calculated based on the inclination and the depth.
Further, the horizontal h displacement amount from the head of the underground continuous wall excavator E to the cutting edge is calculated from the inclination angle of the underground continuous wall excavator E. Thereby, the position of the underground continuous wall excavator E is accurately grasped.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, E is a conventionally known underground continuous wall excavator. The underground continuous wall excavator E is suspended from a column such as a crane (not shown) with a suspension wire W, and is vertically excavated downward. Go ahead. In the construction site of the underground continuous wall, guide walls H1 and H1 are constructed in advance, the excavation guide groove H is excavated to a predetermined depth, and the hole H0 for the underground continuous wall is being excavated. It is the same as before to fill with muddy water.

H is a digging guide groove provided with guide walls H1 and H1 on both sides. Above the digging guide groove H, a measuring stand 10 is provided.
Is facing. On the side of the excavation guide groove H on the ground, a track 1 is provided in a direction parallel to the excavation guide groove H and, if necessary, in an orthogonal direction.
A trolley 1 is laid, and a bogie that can move forward and backward on the track 11 is provided below the measuring stand 10 and is fixed on the track 11 by a stopper 11a.

The upper portion of the gantry 10 protrudes toward the excavation guide groove H, and a slide table 12 is provided in a portion of the excavation guide groove H. The slide table 12 is movable in two directions orthogonal to each other on a horizontal plane of the gantry 10.

An engaging member 13 is provided on the slide table 12. As shown in FIGS. 2 and 3, the locking member 13 is supported by rotating axes X and Y that are orthogonal to each other at different heights and can be inclined in any direction. A rod 15 is fixedly hung below the locking member 13 by screwing or the like, and the rod 15 extends vertically downward from the locking member 13. Also, the inclinometers 14 and 14 are integrated with the rod 15.
Is attached. The inclinometers 14, 14
Is for detecting the inclination of the rod 15 in the axial direction,
Although it may be mounted on the locking member 13, the mounting on the rod 15 has a reliable measurement accuracy.

A winch 16 driven by a torque motor 16a is mounted on a middle portion of the gantry 10. The winch 16 is provided with a depth measuring device 18 for measuring the length of the wire 17 sent out. The wire 17 fed from the winch 16 is connected to the lower end of the rod 15 via a guide pulley 19 on the gantry 10 and a pulley 20 on the underground wall excavator E. The wire 17 has a torque motor 16a. Thus, a predetermined tension is applied. On the other hand, the underground diaphragm excavator E is provided with an inclinometer 21 for detecting its inclination.

In the position detecting apparatus of the present embodiment, the bogie 11 is moved and fixed to the underground continuous wall excavator E in a state where it is hung shallowly in the excavation guide groove H. The positioning of the locking member 13 is performed by the slide table 12 so that the position is located vertically above the pulley 20 of the underground wall excavator E. The vertical position of the rod 15 at this time is recorded as an origin by a separately provided arithmetic unit.

Next, excavation of the underground continuous wall hole H0 is started to detect the position. When the path of the excavating underground continuous wall excavator E is inclined, as shown in FIG.
At the same time, since the rod 15 is inclined, the locking member 13 is also inclined, and the inclinometer 14 detects the angle φ of the rod 15 with respect to the vertical line P. Further, the inclinometer 21 detects the inclination angle θ of the underground diaphragm excavator E itself. On the other hand, the depth measuring device 18 measures the length D from the fixed point O (the locking member 13) of the rod 15 to the pulley 20 of the underground continuous wall excavator E from the length of the wire 17 sent out from the winch 16 according to the excavation. are doing. The arithmetic unit calculates the horizontal displacement amount δ of the underground continuous wall excavator E from the inclination angles φ, θ, the wire length D, and the excavator vertical length L1 that has been preliminarily measured, as follows: δ = D · It is calculated from sinφ + L1 · sin θ.

Although the displacement is shown in only one direction in FIG. 4, the displacement of the underground continuous wall excavator E can be calculated in all directions since the locking member 13 can be inclined in any direction. is there.

In the present invention, whether or not the inclination of the rod 15 shows an accurate inclination as the underground continuous wall excavator E moves greatly affects the accuracy of position detection. That is, the gist of the present invention resides in that it is possible to detect a minute hole bend of the deep-depth diaphragm wall excavator E by a combination of the inclinometer 14 and the rod 15. The calculated values (measured values) and the actual measurement results were as follows. Consider a case where the path of the underground diaphragm excavator E is displaced by δ = 5 cm in the horizontal direction from the vertical line P at points of 150M, 100M, and 50M (see “FIG. 5”). The calculated value at a depth of 150M is as follows. Wire tension T = 100 kg Rotation radius of the locking member 13 r = 1 cm Dynamic resistance coefficient k1 = 0.003 Initial dynamic resistance coefficient k2 = 0.006 Length of rod L = 200 cm Horizontal component t = T * δ / D = 100
000g * 5cm / 15000cm ≒ 30g Rod rotation moment M = L * t = 200cm *
30 g = 6000 g · cm Rotational resistance moment of the locking member 13 Mt = T * k1 * r = 10000
0g * 0.003 * 1.0cm = 300g · cm Initial dynamic resistance moment Mt '= T * k2 * r = 10
0000 g * 0.006 * 1.0 cm = 600 g · cm Since M> Mt ′, therefore, the calculated value δs of the horizontal displacement amount is δs = δ * (M−Mt) / M = 5 cm * (6000−300) / 600 = 4.75 cm. The calculated value at a depth of 100M is as follows. The calculation is omitted. δs = 4.85 cm The calculated value at a depth of 50M is as follows. The calculation is omitted. δs = 4.92 cm On the other hand, the measured values were as follows. At a depth of 150M, 4.9cm at a depth of 100M, 4.8cm, at a depth of 50M, 4.8cm was in good agreement with the calculated value. Incidentally, the numerical values used in this calculation were actually measured by the inventors using the apparatus used in the experiment. In the above formula, the horizontal component of the wire is the depth D of the excavator E, and the rotational moment is the rod length L.
FIG. 6 shows the calculated values obtained when the rod length was changed for each depth. In FIG. 6, the case where the calculated value is 0 does not satisfy M> Mt ′. Also, the shorter the rod 15 in FIG.
The accuracy is reduced or the operation is not performed.
Is approaching. Note that the influence of the slack of the wire and the weight of the rod has been neglected in the above example because it has been confirmed that it is small enough to be neglected by a separate calculation.

[0017]

As described above, according to the present invention, the cradle 10 fixed on the ground is provided with the locking member 13 so as to be tiltable, and the tilt angle of the locking member 13 is detected by the tilt measuring device 14. A rod 15 is fixed to a lower portion of the locking member 13, and a wire 17 is sent out from a motor-driven winch 16 through a guide pulley 19 of the gantry 10 and a pulley 20 on the underground continuous wall excavator E to be sent to the rod 15. An inclinometer 21 for locking and detecting the inclination angle of the underground continuous wall excavator E is provided.
The depth measuring device 18 for measuring the length of the wire 17 sent out by the above is installed to configure the position detecting device of the vertical hole excavator, so that the slight inclination of the course caused by the excavation of the underground continuous wall excavator E can be highly accurate. Can be detected by
An accurate position of the underground diaphragm excavator E can be grasped, and the path of the underground diaphragm excavator E can be appropriately corrected according to the inclination.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a position detection device for an underground continuous wall excavator according to the present invention.

FIG. 2 is a front view of a locking member.

FIG. 3 is a plan view of a locking portion.

FIG. 4 is a principle diagram of position detection.

FIG. 5 is a front view of an element for calculating a position.

FIG. 6 is a calculation value table when the rod length is changed for each depth.

FIG. 7 is a schematic front view of a conventional position detection device for an underground continuous wall excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Measurement stand 13 Locking member 14 Incline measuring device 15 Rod 16 Winch 17 Wire 18 Depth measuring device 19 Pulley 20 Pulley 21 Inclinometer E Underground continuous wall excavator

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masatoshi Chiba 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Yasushi Kuwahara 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction (72) Inventor Takehiro Kumagai 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Toshio Oguri 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Noriyuki Nishida 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Masataka Takei 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (56) Reference Document JP-A-2-108790 (JP, A) JP-A-63-180812 (JP, A) JP-A-1-203585 (JP, A) JP-A-2-1066041 (JP, U) JP-A-61 91114 (JP, ) (58) investigated the field (Int.Cl. ^7, DB name) G01C 15/00 104 G01C 9/00 G01C 15/00 103

Claims (1)

(57) [Claims] 1. An apparatus for detecting the position of an underground continuous wall excavator (E) suspended from a ground support or the like and digging vertically downward, wherein the apparatus is tiltably provided on a gantry (10) fixed to the ground. A locking member (13), a rod (15) fixed and suspended below the locking member (13), an inclination measuring device (14) integrally attached to the rod (15), and the rod ( 15)
(17) a wire (17) from the lower end of the to a winch (16) driven by a torque motor (16a) via a pulley (20) on an underground diaphragm excavator and a guide pulley (19) of a measuring stand (10) An inclinometer (21) provided on the underground diaphragm excavator (E) for detecting the inclination angle thereof;
6) A depth measuring device (18) for measuring the length of the wire sent out from the position detecting device for an underground continuous wall excavator.