JPH02112589A - Method and device for protecting position sensing wire of excavator - Google Patents

Abstract

PURPOSE:To avoid an effect on a position sensing wire by the flowing of a stabilizing liquid by installing a protecting tube having an open-close-free slit in the longitudinal direction and constant length to the upper section of an excavating ditch and housing a position sensing wire. CONSTITUTION:A protecting tube H having an open-close-free slit 12 in the longitudinal direction is disposed into an excavating ditch B, and the upper end section of the protecting tube H is mounted to the upper section of the excavating ditch B by a protecting-tube mounting member 11. A position sensing wire 3 is housed into the protecting tube H from the slit 12, a slender parting plate 13 is engaged with engaging grooves 12a, 12a on both sides of the slit 12, and the slit 12 is closed. Accordingly, even when a stabilizing liquid is made to flow in the excavating ditch B, the generation of displacement such as transverse swing in the position sensing wire 3 can be prevented.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention detects the amount of horizontal displacement of an excavator that excavates a construction trench in order to construct a deep continuous underground wall, reverse pile, etc. The present invention relates to a method and device for protecting a position detection wire.

(Prior Art) As is well known, when constructing a deep continuous underground wall or reverse pit extending over 100 meters, a construction trench must first be excavated.

Conventionally, when excavating this construction trench, a horizontal multi-axis or vertical multi-axis rotary excavator A is used, as shown in Fig. 3, which is equipped with a plurality of rotary cutters 1 or bits at the bottom. It is normal to do so.

That is, the ground is excavated while rotating the rotary cap 1.1 at the bottom, and the excavated earth and sand is discharged to the outside via the mud water pumping pipe 2 connected to the machine body, and an excavation trench B of a predetermined depth is dug. There is.

And at that time, the excavation that will be dug down? In order to ensure the verticality of #B, the following control device for horizontally controlling the attitude of the excavator is generally used.

That is, as shown in FIG. 3, the position detection wire 3 is pulled out from a pedestal C provided on the ground and connected to the excavator A. An optical horizontal displacement meter 4 using, for example, a laser is set in the middle of the position detection wire 3 to detect the displacement of the position detection wire 3 itself in the x and y directions. The displacement of the position detection wire 3 in the X and Y directions is detected.

Next, this detected data is converted into an electrical signal, and is input into a computer to calculate the amount of horizontal displacement of the excavator A in the X and Y directions. Based on this calculated amount of horizontal displacement, the third The upper and lower adjustable guides 5, 5 installed on the front, rear, left, and right sides of the excavator A shown in the figure are operated, that is, the length of the lateral overhang is adjusted, and the digging posture of the excavator A itself is leveled. The verticality of the excavated groove B is ensured by controlling the condition.

Note that the position detection wire 3 in the control device shown in FIG. Excavator A is connected to excavator A.
The horizontal displacement amount and the depth can be detected at the same time.

As explained above, in the excavator A that excavates a construction trench B such as a continuous underground wall, the position detection wire 3 for detecting the verticality and depth of the excavation trench B is connected to the excavation trench B from the mount C.
Generally, the excavator A is connected to the excavator A through the inside of the excavator A.

(Problem to be Solved by the Invention) By the way, inside the excavated trench B, there are usually some steps to prevent the excavated wall surface from collapsing, to maintain the stability of the wall surface and excavation accuracy, and to ensure high quality concrete. Mud water as a so-called stabilizing liquid is normally supplied into the excavated trench B. 10 shown in FIG. 3 is a supply pipe for the stabilizing liquid.

When the stabilizing liquid is supplied into the excavated groove B, a mud flow naturally occurs inside the excavated groove B due to the supply of the stabilizing liquid. In other words, the stable liquid causes a flow phenomenon. Experience has shown that the flow of this stabilizing liquid tends to flow horizontally in the upper part of the excavated groove B.

In the excavation groove B, the position detection wire 3 for controlling the attitude of the excavator A is guided through the stabilizing liquid, as described above, so that when the stabilizing liquid flows in the excavation groove B, it is detected. The wire 3 is naturally affected by this flow. FIG. 4 shows the displacement state of the position detection wire 3 as the stabilizing liquid flows.

As shown in this figure, as a result of displacement such as lateral vibration of the position detection wire 3, an error occurs in the measured value by the horizontal displacement meter 4 that detects the displacement of the position detection wire 3 in the X and Y directions. Of course, there is also an error in depth measurement.

If there is an error in this measured value, an error will inevitably occur in the amount of horizontal displacement of the excavator A itself, resulting in a drawback that accurate attitude control of the excavator A itself cannot be ensured. This tendency is particularly noticeable when there are wood chips or other foreign objects on the surface of the stabilizing liquid, or when the depth becomes deeper, and its influence is large, and in some cases it has become a fatal flaw in construction.

SUMMARY OF THE INVENTION In order to eliminate the drawbacks of the prior art, it is an object of the present invention to provide a method and a device for avoiding the influence of mud flow, that is, the flow of stabilizing liquid, on the position detection wire.

(Means for Solving the Problems) As a means for achieving the above object, the method adopted by the present invention is characterized in that a protective tube for guiding the position detection wire is installed at a constant depth in the upper part of the excavation groove. The protection tube is provided so as to be immersed in the liquid, and the protection tube prevents displacement such as lateral vibration of the position detection wire due to the flow of the stabilizing liquid in the excavated groove.

Further, as a device for carrying out the above method, the protection tube is
It consists of a protection tube of a certain length that has a slit that can be opened and closed in the horizontal direction, and the upper end of this protection tube is attached to the top of the excavation groove using a protection tube attachment member, and the position detection wire is inserted into the protection tube from the slit that can be opened and closed. The purpose is to store it in the holder and use it as a protection device for the position detection wire.

(Function) As explained above, in the present invention, since the position detection wire is covered with a protective tube, even if the stabilizing liquid causes a flow phenomenon, the position detection wire does not oscillate laterally due to the flow. Ta.

Therefore, the accuracy of detecting the amount of horizontal displacement of the position detection wire and detecting the depth has improved, and as a result, the attitude control and depth control of the excavator itself have become more accurate.

(Example) Fig. 1 shows a state in which the protection tube H of the position detection wire 3 is attached to the upper part of the excavation groove B with the protection tube attachment member 1), and the position detection wire 3 is covered with the protection tube H. It is something.

Since the position detection wire 3 is covered with the protective tube H in this way, the stable liquid is supplied into the excavated groove B from the stable liquid supply pipe 10, and the stable liquid does not flow horizontally as a result. Even if there is, the position detection wire will not cause lateral vibration.

FIG. 2 shows a protection device for the position detection wire 3 in which a slit 12 that can be opened and closed in the longitudinal direction is provided in the protective tube H. In the embodiment, as shown in FIG. Engagement grooves 12a, 12a are formed, and this engagement groove 12
a, 12a, (b) an elongated partition plate 13 as shown in the figure;
is inserted from above, and the position detection wire 3 is housed in the protective tube H by opening and closing the sulin 12 section.

In addition, as explained above, in this embodiment, the protection tube 1) equipped with the slit 12 that can be opened and closed is used as a protection device for the position detection wire 3, but it is also possible to use a double-tube structure of the vibrator with the slit. may be of any structure as long as it can avoid the influence of the flow of the stabilizing liquid on the position detection wire 3.Furthermore, it may be of a structure that allows the position detection wire 3 to be easily housed within its protective device. .

In addition, the length of the protection pipe depends on the cross-sectional area and depth of the excavation trench, but empirically, it is from several meters to more than ten meters, especially since the horizontal flow of the stabilizing liquid is large in the upper part of the excavation trench. As long as it is long enough, it can perform its function.

(Effects of the Invention) The method and device for protecting a position detection wire according to the present invention are as follows:
As explained above, since the influence of the flow of the stabilizing liquid does not affect the position detection wire, the accuracy of horizontal displacement and depth detection of the excavator itself is improved.

As a result, we were able to improve the quality of construction work such as continuous underground wall work and reverse shaft construction work. In particular, the present invention uses only a protective pipe with a simple structure in terms of method and equipment, so it has little impact on construction costs, is extremely economical, and can be used for high-quality continuous underground walls and reverse piles. Construction is possible.

[Brief explanation of the drawing]

The drawings show an embodiment of the method and device of the present invention. Fig. 1 is a schematic diagram showing a position detection wire protected by a protection tube, and Fig. 2 shows an embodiment of the protection tube constituting the device. (A) is a perspective view of a protective tube with a slit formed in the elongated direction, and (B) is a perspective view showing a state in which an elongated partition plate is attached to the slit. Note that FIG. 3 is a schematic diagram of a position detection method in an excavator equipped with a position detection wire, and FIG. 4 is a schematic diagram showing the displacement of the position detection wire due to the flow of the stabilizing liquid. A... Excavator B... Excavation groove C... Frame H... Protection tube 3... Position detection wire 4... Horizontal displacement meter 6... Depth meter
10 Stabilizing liquid supply pipe 1)...Protective mounting member 12...Slit 13...Partition plate Fig. 1

Claims (2)

[Claims] (1) A protective tube for guiding the position detection wire is provided in the upper part of the excavation groove so as to be immersed in the stabilizing liquid to a certain depth;
A method for protecting an excavator position detection wire, characterized in that the protection tube prevents the position detection wire from lateral deflection due to the flow of a stabilizing liquid in an excavation groove. (2) A protection tube of a certain length with a slit that can be opened and closed in the longitudinal direction is provided, and the upper end of this protection tube is attached to the top of the excavation groove using a protection tube attachment member and immersed in the stabilizing liquid in the excavation groove. . A protection device for an excavator position detection wire, characterized in that the position detection wire is housed in a protective tube through the openable/closeable slit.