JP2001271343A - Porous wall measuring device and porous wall measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the measuring accuracy and shorten the term of works in regard to the porous wall measuring device and measuring method for cast-in place piles. SOLUTION: A porous wall measuring device 1 comprising a frame 2 located around above ground portion of a pile bore, an ultrasonic measuring device 3 which is supported in a freely movable manner in X-Y directions by the frame 2 and generates and receives ultrasonic waves in two directions intersecting within a horizontal plane, a center position measuring device 4 for measuring the center position for pile bore of the ultrasonic wave measuring device, drive devices 5, 6 for respectively moving the ultrasonic measuring devices in two directions, and a controller 7 for moving the ultrasonic wave measuring device to the center position of the pile bore by controlling the drive of the drive equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus and a method for measuring a hole wall of a cast-in-place pile.

[0002]

2. Description of the Related Art Conventionally, in constructing a cast-in-place pile,
After excavating the ground with an earth auger or the like, concrete is poured and the reinforced cage is dropped into the borehole to form a pile.

[0003] Since the above-mentioned hole is excavated in the ground for several tens of meters, it is not always possible to drill the hole downright (vertically) due to resistance during excavation.

[0004] Therefore, in order to prevent the occurrence of bending stress due to eccentricity and to smoothly insert a steel cage with high straightness (vertical) accuracy into a drilling hole, it is necessary to measure the drilling accuracy of the drilling hole in advance. In this measurement, as shown in FIG. 10, a hole wall measuring device using an ultrasonic wave is set on the center 11 of the pile hole 10 on the ground portion, and is lowered in a vertical direction at a constant speed. This is performed by sensing the reflected wave from the hole wall 12 at the receiver.

[0005]

However, according to the conventional measuring method, when a groove is formed like a continuous wall, the groove width and the excavation accuracy can be measured relatively accurately.
In the case of a circular shape such as the above-mentioned pile hole 10, as shown in FIG. 11, since the horizontal position of the ultrasonic device is easily shifted from the center position 11 of the pile hole 10, the diameter is continuously measured in the depth direction. Is difficult to do. The hole wall measuring device and the measuring method according to the present invention are proposed to solve such a problem.

[0006]

The gist of the present invention for solving the above-mentioned problems of the hole wall measuring device according to the present invention is to provide a gantry mounted around the above-ground portion of the pile hole, and an X-Y An ultrasonic measurement device that is supported movably in two directions and transmits and receives ultrasonic waves in two directions orthogonal to each other in a horizontal plane, and a center position measurement device that measures a center position of the ultrasonic measurement device with respect to a pile hole A driving device for moving the ultrasonic measuring device in two directions, and a control device for controlling the driving of the driving device to move the ultrasonic measuring device to the center position of the pile hole.

According to the hole wall measuring method of the present invention, an ultrasonic measuring device for transmitting and receiving ultrasonic waves in two directions orthogonal to each other in a horizontal plane is dropped on a pile hole, and the hole diameter is measured in two directions for each desired pitch. Further, the method is a method of measuring the hole diameter and accuracy of the pile hole by moving the ultrasonic measuring device to a center position of the hole diameter.

According to the hole wall measuring device and the measuring method according to the present invention, the hole diameter of the drilled hole is measured at every desired pitch in two orthogonal directions, and the center position of the pile hole at that position is measured. Can be. As a result, a deviation from the center position of the default pile hole on the ground can be determined. These measurements are repeated to the bottom of the hole, and the accuracy of the entire hole with respect to the vertical can be understood three-dimensionally.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a hole wall measuring apparatus and a measuring method according to the present invention will be described with reference to the drawings. To facilitate understanding of the present invention, portions corresponding to those of the conventional example will be denoted by the same reference numerals as those of the conventional example.

As shown in FIG. 1, a hole wall measuring device 1 according to the present invention comprises a gantry 2 placed around a ground portion of a pile hole 10;
An ultrasonic measurement device 3 that is supported by the gantry 2 so as to be movable in two directions XY and that transmits and receives ultrasonic waves in two directions orthogonal to each other in a horizontal plane; and a pit hole of the ultrasonic measurement device 3 1
A center position measuring device 4 for measuring the center position 11a with respect to 0, driving devices 5 and 6 for moving the ultrasonic measuring device 3 in two directions, respectively, and controlling the driving of the driving devices 5 and 6 to control the ultrasonic wave. The control device 7 moves the measuring device 3 to the center position 13 of the pile hole 10.

The gantry 2 is, for example, a rectangular frame with legs. Then, moving axes 2a and 2b of XY axes are provided, and slidably provided by driving devices 5 and 6 (not shown). The moving shafts 2a and 2b are provided with long holes penetrating in the vertical direction along the longitudinal direction, respectively.
The driving devices 5 and 6 are electrically connected to a control device 7 to control the amounts of movement in the X and Y directions, respectively.

At the intersection of the elongated holes of the moving shafts 2a and 2b, there is provided a tubular body 9 which is vertically inserted and through which a hanging cable 8 is inserted through a central through hole as shown in FIG. . A flange 9a is provided at an upper portion of the cylindrical body 9 so as not to fall. As the long holes of the moving shafts 2a and 2b move, the cylindrical body 9 slides and moves to an arbitrary position on the XY axis.

An ultrasonic measuring device 3 is suspended from an end of the suspension cable 8. The other end of the suspension cable 8
It is connected to a winding drum and the like. The height management cord 15 of the ultrasonic measuring device 3 is electrically connected to the center position measuring device 4, and is unwound and wound from the reel portion 15 a together with the suspension cable 8 through the cylindrical body 9. It is used for height management of the ultrasonic measurement device 3.

As shown in FIG. 3, a fixing cap 16 having a roller 16a for allowing the suspension cable 8 to move in the vertical direction and preventing rotation in a horizontal plane is provided on the upper part of the cylindrical body 9. I have.

FIG. 4 is a schematic flowchart showing the procedure for setting such a hole wall measuring device 1 on the ground portion of a pile hole 10 excavated in the ground.

After setting the ultrasonic measuring device 3 at the center position 11a of the pile hole 10 on the ground (set as an initial value), as shown in FIG.
m), an ultrasonic wave is transmitted in two directions of the XY directions to
2 and transmits the data to the center position measuring device 4 to determine the diameter of the pile hole 10 and the center position 1 of the pile hole 10.
Measure 3.

As shown in FIGS. 6 and 7, the control device 7 appropriately drives the driving devices 5 and 6 to move the moving shafts 2a and 2b in one of the two directions of XY. The cylindrical body 9 and the ultrasonic measuring device 3 through which the pile hole 1
It is moved to the center position 13 of 0.

The measuring operation and the center position moving operation are repeated for each depth according to the flowchart shown in FIG.
The deviation between the center position 13 for each predetermined pitch and the center position 11a of the first pile hole 10 set on the ground portion is recorded.
That is, the distances X, Y from the hole wall 12 in the X direction and the Y direction
When the ultrasonic measurement device 3 is moved to the position where the maximum is obtained, the maximum value of the distances X and Y becomes the diameter in the X and Y directions, and the X and Y coordinate values of the moving point are the center position 13 of the measurement point. It is an absolute value.

The center position 13 and the ground center position 11a
If the difference is recorded as the difference between the X and Y coordinate values, the deviation in the horizontal plane is obtained, and this is divided by the depth of the measurement point position (quotient calculation), whereby the inclination angle from the ground at that position (vertical accuracy) Can be easily calculated. By using the record of the measurement position, it is possible to easily calculate the inclination not only from the ground but also in the measurement section. It should be noted that the numerical value due to the collapse of the hole wall 12 of the pile hole 10 is not considered.

By measuring the bottom of the pile hole 10 in this way, as shown in FIG. 9, the deviation of the center position 13 at each depth of the pile hole 10 from the center position 11a can be determined together with the depth. (Vertical accuracy) can also be easily calculated. This positional deviation is confirmed in real time on the spot on the screen of the monitor connected to the control device 7, and by displaying this as a continuous trajectory, it can be seen how the central position is displaced.

This method can be easily used for management. For example, excavation accuracy (allowable misalignment value and allowable vertical accuracy) and pile diameter are input to the control device in advance,
If the misalignment or inclination angle (vertical accuracy) exceeds the allowable value,
If the pile diameters X and Y are each smaller than the design value, or if the pile diameter is only partially large due to the collapse of the pile hole, the alarm sound and display color may be changed to red. It is possible to make confirmation and judgment possible.
The ultrasonic measurement device 3 moves only in the depth direction and descends without rotating in a horizontal plane.

[0022]

As described above, the pedestal mounted around the above-ground portion of the pile hole according to the present invention, the pedestal is supported by the pedestal so as to be movable in two directions XY, and is supported in the horizontal plane. An ultrasonic measuring device for transmitting and receiving ultrasonic waves in two directions orthogonal to each other, a center position measuring device for measuring a center position of the ultrasonic measuring device with respect to a pile hole, and moving the ultrasonic measuring device in two directions. And a control device for controlling the driving of the driving device to move the ultrasonic measuring device to the center position of the drilling hole, so that the hole diameter in two directions in the horizontal plane is measured at a certain depth of the pile hole. Thus, the pile diameter and the center position can be immediately determined, and the deviation from the center position of the pile hole on the ground can be determined, and the excavation accuracy can be measured at the same time. Therefore, it is possible to continuously measure the hole diameter, center deviation, and vertical accuracy of the pile hole in the depth direction.

According to the measuring method of the present invention, an ultrasonic measuring device for transmitting and receiving ultrasonic waves in two directions orthogonal to each other in a horizontal plane is dropped on a hole, and the hole diameter is measured in two directions for each desired pitch; By moving the ultrasonic measuring device to the center position of the hole diameter, it is possible to measure the pile diameter and accuracy (center misalignment, vertical accuracy) only by lowering the ultrasonic measuring device once in the depth direction. It will be shortened.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing the entire configuration of a hole wall measuring device according to the present invention.

FIG. 2 is a partially enlarged front view of the hole wall measuring device according to the present invention.

FIG. 3 is a plan view (A) and a cross-sectional view (B) of a fixing cap in the hole wall measuring device according to the present invention.

FIG. 4 is a flowchart showing a procedure for setting a gantry of the hole wall measuring device of the present invention.

FIG. 5 is an explanatory diagram of a measurement situation by the hole wall measuring device of the present invention.

FIG. 6 is an explanatory view (a), (b), and (c) of an example showing a center position of a pile hole by the hole wall measuring device of the present invention.

FIG. 7 is an explanatory diagram showing measurement of the center position of the pile hole by the hole wall measuring device of the present invention.

FIG. 8 is a flowchart of a measuring method by the hole wall measuring device of the present invention.

FIG. 9 is a plan view showing a trajectory of a deviation between the center position of the pile hole and the center position of the ground portion by the hole wall measuring device of the present invention.

FIG. 10 is an explanatory diagram showing a measuring method using a hole wall measuring device in a conventional example.

11 (a), 11 (b), and 11 (c) are views showing a shift of the center position by the hole wall measuring device in the conventional example.

[Explanation of symbols]

1 hole wall measuring device, 2 gantry, 2a, 2b moving axis, 3
Ultrasonic measuring device, 4 center position measuring device, 5, 6 driving device, 7 control device, 8 hanging cable, 9 cylinder,
10 Pile holes, 11 and 11a Center position of the ground part, 12
Hole wall, 13 Center position of pile hole at each depth, 15 cords, 16 fixing caps.

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[Procedure amendment]

[Submission date] April 4, 2000 (200.4.4)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

FIG. 8

FIG. 9

FIG. 10

FIG. 11

Claims (2)

[Claims] A pedestal placed around a ground portion of a pile hole, and supported on the pedestal so as to be movable in two directions XY and transmitting ultrasonic waves in two directions orthogonal to each other in a horizontal plane. An ultrasonic measuring device for receiving, a central position measuring device for measuring a center position of the ultrasonic measuring device with respect to the pile hole, a driving device for moving the ultrasonic measuring device in two directions, and driving of the driving device And a control device for controlling the ultrasonic measurement device to move the ultrasonic measurement device to the center position of the pile hole. 2. An ultrasonic measuring device for transmitting and receiving ultrasonic waves in two directions orthogonal to each other in a horizontal plane is dropped on a pile hole, and the hole diameter is measured in two directions for each desired pitch. Measuring the hole diameter and accuracy of the pile hole by moving the hole diameter to the center position of the hole diameter.