JP2007070911A - Displacement gauge available in hole cavity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a displacement gauge available in a hole cavity, which is for use when excavation is carried out by an excavation cutter, based on a schedule line connecting between two locations, by measuring vertical and horizontal bends in a borehole, comparing measured values with a curvature of the excavation schedule line determined beforehand, and determining a propelling direction of the excavation cutter. <P>SOLUTION: The displacement gauge available in the hole cavity is formed of: charging platforms 8 which are charged along a guide member 6 formed on one-side inner walls of pipe bodies 3 connected together and inserted into the borehole 2 excavated by the excavation cutter 1, and connected together via couplers 9; first and second displacement gauges 11, 12 which are universally jointed via their head ends near the coupler of the charging platforms 8; and a control means 5 for receiving the measured values from the first and second displacement gauges 11, 12, and outputting a steering signal to a propelling section of the excavation cutter 1. According to the displacement gauge, the propelling section of the excavation cutter is controlled by comparing the values of the curvature (displacement) obtained by the first and second displacement gauges 11, 12, with the curvature of the excavation schedule line determined beforehand. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention measures the vertical and horizontal folds in the excavation hole when excavating through the excavation cutter based on the planned line connecting the two locations, and the measured value of the excavation planned line that has been determined in advance. The present invention relates to an in-hole displacement meter that can determine the propulsion direction of an excavation cutter in comparison with the curvature.

For example, when two independent tunnels “up” and “down” of a subway are connected to each other and converted into one large tunnel, excavation cutters are provided at the top and bottom of the widened portion between the two tunnels. In some cases, drilling holes with a certain curvature are drilled in parallel, and the work is proceeded while connecting and reinforcing the pipes sequentially into the drilling holes during excavation. It is important to keep the curvature of the excavation hole drilled by the excavation cutter constant. In order to keep the curvature of the borehole constant, there was a concept of using a displacement meter, but there was no actual application. Conventionally, as excavation work using a displacement meter, for example, there is a description in JP-A-11-303583. This means that the hydraulic pressure of the cylinder for propulsion that drives the excavator body equipped with the excavation cutter and the protruding amount of the rod part are detected by the pressure detector and the displacement meter, respectively, and the rock mass of the ground is detected, and from this detection value to the rock mass It is for estimating the amount of penetration.
JP 11-303583 A

  Therefore, the displacement meter is for transmitting the rock strength information from the excavator body to the rock strength estimation device together with the hydraulic pressure of the cylinder for propulsion and the protruding amount of the rod portion, and the propulsion direction of the excavation cutter. Was not an in-hole displacement meter for steering based on a predetermined excavation plan line.

  The present invention provides an in-hole type displacement meter for reliably digging each digging hole when digging and penetrating a digging hole with a certain curvature in parallel by a digging cutter based on a planned line connecting two points. It is intended.

  In order to achieve the above object, an in-hole type displacement meter according to the present invention is connected via a connector along a guide member formed on one inner wall of a tubular body connected and inserted into an excavation hole by an excavation cutter. The first and second displacement meters in which the head ends are universally jointed in the vicinity of the coupler of the charging table, and the measured values from the first and second displacement meters. And a control means for receiving and outputting a steering signal to the propulsion unit of the excavation cutter. The curvature (displacement amount) obtained by the first and second displacement meters and the planned excavation determined in advance. The propulsion part of the excavation cutter can be controlled compared to the curvature of the line.

  Further, the in-hole type displacement meter according to claim 2 is characterized in that the first and second displacement meters are coupled to each other in such a manner that their tail ends are extendable in the vicinity of the middle of the charging table. The first displacement meter and the second displacement meter that measure the curvature of the borehole drilled by the cutter smoothly adjust the length along the extending direction in the upward arc drilling hole and the shrinking direction in the downward arc drilling hole. It was configured to be able to do it.

  According to the present invention, the tubular body is sequentially inserted into the excavation hole excavated with a predetermined curvature by the excavation cutter, and is inserted while being connected by the coupler along the guide member in the tubular body. The bending rate of the charging table is read by the first and second displacement meters in which the head ends are universally jointed in the vicinity of the coupler of the charging table, and the measured values from the first and second displacement meters are read. Since it is possible to steer while checking whether the propulsion direction of the excavation cutter is determined in advance by the received control means, for example, between two independent tunnels “up” and “down” of a subway. When connecting and remodeling into one large tunnel, it is possible to drill a hole with a certain curvature in parallel with the excavation cutter at the ceiling and bottom of the widened part between the two tunnels. The one in which an effect.

  Further, according to the in-hole type displacement meter according to claim 2, the tail end portions of the first and second displacement meters are connected to each other in an extendable manner in the vicinity of the middle of the charging table. Therefore, the first displacement meter and the second displacement meter that measure the curvature of the drilling hole excavated by the excavating cutter can be adjusted smoothly in the length direction regardless of whether it is an upward or downward arc. For this reason, the first displacement meter and the second displacement meter do not become unreasonable, and an excellent effect is obtained in that an accurate measurement value can be obtained.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view of the structure of the excavation cutter and the pipe connected thereto, FIG. 2 is a schematic side sectional view of the pipe inserted into the excavation hole, and FIG. 4 is an enlarged sectional view taken along the line AA in FIG. 3, FIG. 5 is an enlarged sectional view taken along the line BB in FIG. 3, and FIG. 6 is an exploded perspective view of the joint portion provided on the base. 7 is an enlarged sectional view showing the principle of the differential transformer.

  In the figure, reference numeral 1 denotes an excavation cutter, 2 an excavation hole by the excavation cutter 1, and 3 a pipe body that is sequentially inserted into the excavation hole 2 by the excavation cutter 1. The pipe body 3 is previously formed into a required curved surface in accordance with the curvature of the excavation hole 2, and in the excavation hole 2, as shown in FIG. Moored and drawn.

  The excavation cutter 1 includes an excavation unit 1a, a propulsion unit 1b, and a steering unit 1c. The steering unit 1c can steer the propulsion unit 1b by independent operation of each of the four jacks 1d. The steering signal to the steering unit 1c is output from the control means 5 described later.

  A guide member 6 is provided on one inner wall of the pipe body 2 (a ceiling wall in a pipe body inserted into an upward arcuate excavation hole and a bottom wall in a pipe body inserted into a downward arc excavation hole). ing. The guide member 6 is formed in a monorail shape (not shown) on the ceiling wall, but is formed in a box shape (for example, a concave shape) on the bottom wall as shown.

  The box-shaped guide member 6 is inserted with a charging base 8 having a sliding roller 7 on the lower surface sequentially connected via a coupler 9 (see FIG. 3). A first displacement meter 11 and a second displacement meter 12 whose head ends are universally jointed via a connecting portion 10 provided in the vicinity of the coupler 9 are provided on the upper surface of the charging table 8. . The first displacement meter 11 and the second displacement meter 12 are arranged between the both side walls of the box-shaped guide member 6 via a horizontal rotating roller 14 supported by a frame member 13 whose base end is fixed to the side surface of the charging base 8. Is maintained. Further, the tail ends of the first displacement meter 11 and the second displacement meter 12 are coupled to each other via a coupling member 31 that can be expanded and contracted (slidable in the axial direction) in the vicinity of the middle of the charging base 8.

  The first displacement meter 11 and the second displacement meter 12 have measuring means 15 and 15 'for measuring the bending angle (displacement amount) in the vertical direction and the horizontal direction, respectively, around the connecting portion 10 whose head ends are universally jointed. A rolling meter (not shown) is built in as needed. The measured value of this rolling meter is obtained when the tubular body 3 sequentially connected to the excavation hole 2 excavated by the excavation cutter 1 is twisted in the circumferential direction (rolling) by the rotational force of the cutter. The first displacement meter 11 and the second displacement meter 12 are used for correcting the measured values.

  The connecting portion 10 in which the first displacement meter 11 and the second displacement meter 12 are universally jointed is configured as shown in FIG. That is, a through-hole provided in the side surface of a concave frame (only the front frame is visible) 17 whose bottom surface is pivotally attached to the upper surface (near the connection point) of the charging table 8 via a pin 16. A shaft hole 19 inserted from the outside of 18 is loosely inserted into a through hole 20 provided in the opposed end pieces 12a and 12b of the second displacement meter 12 and a horizontal hole 22 penetrating the center of the center piece 21 in the horizontal direction. is doing. Therefore, the second displacement meter 12 can be rotated in the vertical direction around the shaft rod 19.

  Further, a pin 25 is loosely inserted into the through hole 23 penetrating the upper and lower surfaces of the center piece 21 from the outside of the through hole 24 provided in the opposed end pieces 11a and 11b of the first displacement meter 11. Therefore, the first displacement meter 11 can be rotated in the horizontal direction around the pin 25.

  A differential transformer may be used as the measuring means 15 and 15 ′ built in the connecting portion 10 of the first displacement meter 11 and the second displacement meter 12. That is, as shown in FIG. 7, the differential transformer includes a coil 26 and an iron core 27, and the coil 26 has a second displacement meter 12 with respect to the inner surface of the vertical wall (the left side wall in FIG. 6). Then, the center hole 28 of the coil is attached orthogonally to the inner surface of the horizontal wall (the lower wall in FIG. 6). The iron core 27 is fixed to the free ends of the support frames 29 and 30 extending from the center piece 21.

  Accordingly, in normal times, the iron core 27 is stationary at the axial center C of the center hole 28 of the coil 26, and the voltage excited by the coil is maintained at "0". The displacement meter 12 is bent longitudinally or laterally around the connecting portion 10 and the iron core 27 is inserted deeply into the central hole 28 of the coil or pulled toward the front side, so that the voltage excited by the coil changes. The bending angle can be measured by this voltage change.

  Since the first displacement meter 11 and the second displacement meter 12 incorporating the measuring means 15 and 15 'for measuring the folds in the two directions are opposed to each other with the connector 9 of the charging table 8 interposed therebetween, On the cradle 8, the end of the first displacement meter 11 and the end of the second displacement meter 12 are connected to each other via a connection member 31 so as to be extendable and contractible. This is because the end portions of the first displacement meter 11 and the second displacement meter 12 that measure the curvature of the excavation hole excavated by the excavation cutter are expanded in the upward arc excavation hole and contracted in the downward arc excavation hole. This is because the length can be adjusted smoothly.

  Thus, the first displacement meter 11 and the second displacement meter 12 are deformed (folded) in the guide member 6 of the tube body 3 in which the charging base 8 is connected and inserted into the excavation hole by the excavation cutter as described above. The measurement means 15, 15 ′ measure the measured values, and the measured values are received by the control means 5, and the control means 5 determines the drilling hole based on the planned line through which the excavated cutter 1 penetrates the received measured values. Compared with the curvature in real time, when it is deviated, the steering unit 1c of the propulsion unit 1b of the excavation cutter 1 is steered to correct the propulsion direction.

  Next, the operation of the present application will be described. First, determine the drilling hole plan line that connects the two points with a certain curvature. Excavation is started by the excavation cutter 1 based on the determined plan line. Thus, the tube body 3 is inserted into the excavation hole 2 by the excavation cutter 1 while being sequentially moored via the connecting means 4 behind the excavation cutter 1.

  The charging base 8 is sequentially inserted while connecting the coupler 9 while running the sliding roller 7 on the inner bottom surface of the guide member 6 fixed along the length direction on one inner wall along with the insertion of the tube body 2. In accordance with the insertion, the measuring means 15 and 15 in the first displacement meter 11 and the second displacement meter 12 are bent in the vertical direction or the horizontal direction around the connecting portion 10 jointed universally in the vicinity of the coupler 9. 'Are sequentially measured and output to the control means 5.

  The control means 5 that has received this measured value compares the curvature of the drilling hole based on the planned line penetrating through the excavating cutter 1 and obtains the deviation of the planned line in real time. The steering unit 1c is steered to correct the original propulsion direction.

  For example, in the case where two independent tunnels “up” and “down” of a subway are connected to each other and modified into one large tunnel, the device of the present application is a ceiling portion of a widened portion between the two tunnels and This is an in-hole displacement meter for drilling a hole with a certain curvature at the bottom with a drilling cutter, and connecting and inserting a pipe body into this hole to reinforce the work.

It is a schematic top view of a structure with the pipe body connected with the excavation cutter. It is a schematic side sectional view of a state where a tubular body is connected and inserted into a borehole. It is an enlarged side view of a displacement meter in the present application. It is an AA line expanded sectional view in FIG. It is an BB line expanded sectional view in Drawing 5. It is a disassembled perspective view of the joint part of a base. It is sectional drawing which shows the principle of a differential transformer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation cutter 1a Excavation part 1b Propulsion part 1c Steering part 1d Jack 2 Excavation hole 3 Tubular body 4 Connection means 5 Control means 6 Guide member 7 Sliding roller 8 Loading base 9 Connector 10 Connection part 11 1st displacement meter 11a, 12b Opposing end piece 12 Second displacement meter 12a, 12b Opposing end piece 13 Spring piece 14 Horizontal rotating roller 15, 15 'Measuring means 16 Pin 17 U-shaped frame 18 Through hole 19 Shaft 20 Through hole 21 Central piece 22 Horizontal hole 23 Through Hole 24 Through-hole 25 Pin 26 Coil 27 Iron core 28 Coil center hole 29, 30 Support frame 31 Connection member

Claims (2)

  In the vicinity of the connecting base of the charging base, the charging base connected via the coupler along the guide member formed on one inner wall of the tubular body connected and inserted into the excavation hole by the excavation cutter First and second displacement meters universally jointed at the head ends, and control means for receiving measurement values from the first and second displacement meters and outputting a steering signal to the propulsion unit of the excavation cutter An in-hole displacement meter characterized by comprising:   2. The in-hole displacement meter according to claim 1, wherein the first and second displacement meters are coupled to each other so that their tail ends are extendable near the middle of the charging table.

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