JP4256526B2 - Displacement measuring device for underground excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a displacement measuring apparatus that connects the lower end of a measuring wire to an underground excavator and measures the position and displacement of the underground excavator by measuring the displacement of the wire on the ground.
[0002]
[Prior art]
Underground excavators used for construction of underground underground walls and the like are required to accurately manage horizontal displacement and torsion (horizontal rotation). Particularly in construction where the excavation depth exceeds 100 m, a highly accurate measurement management technique is particularly required. A displacement measuring device using a measuring wire has been developed and used as a technology that satisfies these requirements.
[0003]
As shown in FIG. 5 , the principle of the displacement measuring device using the measuring wire is such that the lower end of the measuring wire 1 is connected to the underground excavator 2 and the displacement of the wire 1 is detected by the detection unit 3 (displacement sensor) on the ground. taking measurement. The upper end of the measuring wire 1 is supported at a fixed position by a fixed point 4. Therefore, when the displacement of the measuring wire 1 is measured, the position and displacement of the underground excavator 2 can be measured.
[0004]
Conventionally, various types of such displacement measuring devices are known and have been put to practical use (see, for example, Japanese Patent Application Laid-Open No. 10-299028, Japanese Patent Application Laid-Open No. 5-209492, Japanese Patent Application Laid-Open No. 7-34771, etc. by the present applicant). .
[0005]
The conventional general, this type of displacement measuring device, as illustrated in FIGS. 6 and 7, the wire drum 5 and the servo motor 6 is measured wire 1 a functional element that feeds while maintaining a constant tension, and measured Based on the displacement of the wire 1, the position or displacement of the underground excavator 2 is calculated and displayed on the display 8. In addition to the control panel 7 which is a control function element, the fixed point of the measuring wire 1 fed out from the wire drum 5 A large and heavy structure housed in one large casing 9 is also included in the guide sheave 4 corresponding to the above and the detecting unit 3 (displacement sensor) which is a functional element for measuring the displacement of the measuring wire 1. Has been. More specifically, the width of the casing 9 is about 1 m, the depth length is 2.5 m, the height is about 2.5 m, and the weight is about 1 to 2 tons. Conventionally, two large and heavy displacement measuring devices 10 are installed on the ground, and the horizontal rotation (twist) and displacement of the underground excavator 2 are measured.
Reference numeral 11 in FIG. 7 denotes a mount on which the displacement measuring device is installed.
[0006]
[Problems to be solved by the present invention]
In recent years, continuous underground wall construction in urban areas has severe construction conditions, such as narrow places, places where there are height restrictions such as under underpasses and under road linings, or construction close to structures. Construction on site is increasing. To cope with this, downsizing of underground excavators and reduction of machine height are being promoted. However, since the underground excavator has been downsized, it becomes increasingly difficult to maintain the verticality of the excavation hole.
[0007]
In order to maintain the verticality of the excavation hole, it is indispensable to use a displacement measuring device of the underground excavator. However, as described above, conventional displacement measuring devices are mainly intended for underground excavators for large depths and large cross sections, and are used by installing them in confined places and places with height restrictions. There were many problems with size, weight and function. In particular, the following problems are significant.
[0008]
(1) If the displacement measuring device is large, the pedestal is likely to be deformed by the surrounding environment such as solar radiation, temperature and vibration, which directly affects the measurement accuracy. In particular, the thermal deformation of the gantry is proportional to the size of the gantry of the displacement measuring device, and in the case of a displacement measuring device having a total length of about 3 m, a deviation or error in the measured value of the sensor by about 0.36 mm with a temperature change of 10 ° C. Is produced. When converted to an excavation depth of 100 m, such an error appears as an error of 36 mm as a measurement value, which significantly reduces the measurement accuracy. Moreover, since heat shrinkage due to solar radiation changes with time, it is difficult to calibrate (correct) it.
[0009]
{Circle around (2)} When the underground excavator is lifted to the ground, it causes interference with the displacement measuring device, so it is necessary to move the displacement measuring device first. In this regard, the conventional displacement measurement device has a slide mechanism and a rotation mechanism, and is configured to be movable, but therefore, in addition to the installation space for the displacement measurement device, up to the space to move and wait It is necessary.
[0010]
By the way, the displacement measuring apparatus proposed in the above-mentioned Japanese Patent Application Laid-Open No. 10-299028 has improved the function of the displacement measuring apparatus that conventionally required two sets to be used as a set, The feature is that only one unit can be used.
[0011]
Accordingly, an object of the present invention is to further improve the displacement measuring apparatus of the above to improve the excavation accuracy of the underground excavator (elimination of deviation from the planned position).
[0012]
An important object of the present invention is to provide a functional element that feeds a measurement wire while maintaining a constant tension, and a control function that calculates the position or displacement of the underground excavator based on the measured displacement of the wire and displays it through a display. Provides a displacement measuring device that has a separate and independent configuration of the casing of the main body including the elements and the casing of the detection unit , which is composed of functional elements that measure the displacement of the measurement wire and is controlled to always maintain a horizontal state. It is to be.
[0013]
A further object of the present invention is to be used in a narrow place, a place with a height restriction such as under an elevated girder or under a road lining, or a place with severe construction conditions such as construction close to a structure. It is an object of the present invention to provide a displacement measuring apparatus for an underground excavator that is suitable for the above-mentioned, is less susceptible to the adverse effects of thermal deformation, requires only a small installation space, and can be easily moved and installed.
[0014]
[Means for Solving the Problems]
As a means for solving the above-described problem, a displacement measuring device for an underground excavator according to the invention of claim 1 is:
The lower end of the measuring wire knot and underground excavator, the displacement measurement apparatus for measuring the position and the displacement of the underground excavator by measuring the displacement of the wire on the ground,
A functional element that feeds the measuring wire while maintaining a constant tension, and a main body including a control functional element that calculates the position or displacement of the underground excavator based on the measured displacement of the wire and displays it through the display . A casing ,
A casing of the detection unit accommodating functional elements for measuring the displacement of the measurement wire is a separate and independent configuration, the casing of the detector is independent of the base frame via a controllable leveling mechanism to maintain the horizontal state Installed on top ,
The main body part and the detection part are installed at a position immediately above the detection part by means of a support arm extending from the main body part of the measurement wire guide sheave drawn out from the functional element of the main body part, and the measurement wire passing through the guide sheave It is characterized by being combined by passing through the detector of the detection unit and connecting the lower end with an underground excavator .
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Figure 1 conceptually illustrates an embodiment of a displacement measurement apparatus of the underground excavator according to the present invention. As shown in FIG. 2 , this displacement measuring apparatus connects the lower end of the measuring wire 1 to the underground excavator 2, and the displacement of the wire 1 is measured by the ground detection unit 3 to detect the displacement of the underground excavator 2. This is a configuration for measuring the position and displacement. The entire system configuration is as shown in FIG.
[0018]
First, FIG. 1 calculates the position or displacement of an underground excavator based on a wire drum 5 and a servo motor 6 as functional elements that feed the measuring wire 1 while maintaining a constant tension, and the measured displacement of the wire 1. A control panel 7 which is a control function element to be displayed through the display 8, a main body 20 in which they are housed in an independent casing 9, and a detector 3 which is a function element for measuring the displacement of the measurement wire 1. and casing (compact optical displacement sensor) in adult Ru detection unit 11 is a separate and independent configuration, both, the guide sheave 4 of the wire drum 5 from the fed-out measuring wire 1 of the body portion 20, The measuring wire 1 installed at a position directly above the detection unit 11 and passing through the guide sheave 4 is passed through the detector 3 of the detection unit 11 and its lower end is passed to the underground excavator 2 as shown in FIG. tying It is combined.
[0019]
In the embodiment of FIG. 1, the guide sheave 4 is supported on the side surface of the casing 9 of the main body portion 20 by the support arm 12 being installed so that it can be raised and lowered by the attachment portion 13 and extending like a boom of a crane. Tei Ru. Thus, the main body 20 and the detection unit 11 are configured such that each casing is completely separated and independent.
[0020]
It is shown in Figure 2 a more concrete example.
That is, the casing of the main body portion 20 is configured to be installed on a moving vehicle having the traveling portion 14, and is folded at the front portion of the casing as support means for the guide sheave 4 as indicated by arrows a and b. It is provided with a supporting Jiude 12 that will be deployed, or conversely in the opposite order. For the folding mechanism of the support arm 12, various known hydraulic jack drive systems such as crane booms are preferably employed.
[0021]
On the other hand, the detection unit 11, FIG. 3 A, as shown in detail in B, the detector 3 (optical displacement sensor) casing was housed therein, leveling mechanism 15 such as a plurality of vertical screw jacks It is installed in a vertical posture on the base frame 16 via the, and is configured to be small and lightweight. By operating the leveling mechanism 15, the detection unit 11 is controlled so as to always maintain a horizontal state. The detection unit 11 can be easily installed at a position directly above the excavation hole 17 by the base frame 16.
[0022]
Therefore, according to said structure, it can be used if only the small detection part 11 is installed on the excavation hole 17, and the movement and installation are simple. And since the detection part 11 comprised as small as possible is not influenced at all by the thermal contraction, vibration, etc. of the large-sized main-body part 20, a measurement precision improves that much. Since the detection unit 11 is small in size, it can be easily adjusted and maintained, and can be easily subjected to anti-vibration measures against ground vibration and the like.
[0025]
[Effects of the present invention]
Since the displacement measuring device of the underground excavator according to the invention described in claim 1 is configured such that the casing of the main body portion 20 and the detection portion 11 is separated and independent, a narrow place, an overhead girder, a road lining It is suitable for use in places where the construction conditions are severe, such as places where the height is limited, such as below, or construction close to the structure.
[0026]
In addition, since the detection unit 11 is less likely to be adversely affected by the thermal deformation of the main body unit 20 and can be used simply by installing the small detection unit 11 on the excavation hole 17, the installation space can be reduced. Easy to move and install.
[0027]
The small detection unit 11 can easily adjust and maintain the level, and can easily implement a vibration-proof measure.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram conceptually showing an embodiment of a displacement measuring apparatus according to the present invention.
FIG. 2 is an elevational view of the more specific embodiment of FIG.
[3] A plan view of the detection unit, B is an elevational view.
FIG. 4 is a schematic diagram of the entire system of the displacement measuring apparatus.
FIG. 5 is a diagram illustrating the principle of a displacement measuring device.
FIG. 6 is an explanatory view conceptually showing a conventional displacement measuring apparatus.
FIG. 7 is an elevation view of the more specific embodiment of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Measuring wire 2 Underground excavator 5 Wire drum 7 Control panel 20 Main part 3 Detector 11 Detection part 15 Leveling mechanism 4 Guide sheave 12 Support arm

Claims (1)

The lower end of the measuring wire knot and underground excavator, the displacement measurement apparatus for measuring the position and the displacement of the underground excavator by measuring the displacement of the wire on the ground,
A functional element that feeds the measuring wire while maintaining a constant tension, and a main body including a control functional element that calculates the position or displacement of the underground excavator based on the measured displacement of the wire and displays it through the display . A casing ,
A casing of the detection unit accommodating functional elements for measuring the displacement of the measurement wire is a separate and independent configuration, the casing of the detector is independent of the base frame via a controllable leveling mechanism to maintain the horizontal state Installed on top ,
The main body part and the detection part are installed at a position immediately above the detection part by means of a support arm extending from the main body part of the measurement wire guide sheave drawn out from the functional element of the main body part, and the measurement wire passing through the guide sheave A displacement measuring device for an underground excavator, wherein the displacement measuring device is combined by passing the lower end of the detector into a detector and connecting the lower end to the underground excavator .

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