JP4361521B2 - Measure method for reaching position of shield machine - Google Patents

Description

  The present invention relates to a reaching position measuring method for a shield machine, and more particularly to a reaching position measuring method for a shield machine that measures the position of a shield machine before a shield machine that reaches a reaching shaft is advanced into the mine. .

  In general, the shield tunnel method is connected between the starting shaft and the reaching shaft by performing the excavation work with the shield machine while obtaining the reaction force from the segments that are sequentially installed backward from the starting shaft to the reaching shaft. This is a method of forming a tunnel by a number of installed segments. Various shield machines such as a mud pressure shield machine and a muddy shield machine are known as shield machines for carrying out the shield tunneling method.

  In the shield tunnel construction method, when the shield machine is made to reach the arrival shaft, the shield machine is made to enter the tunnel by passing through a wellhead that is formed in a retaining wall constructed by a continuous wall or the like around the arrival shaft. However, for example, by improving the ground around the wellhead, earth and sand and water will flow into the well from the gap between the wellhead with the opening formed and the outer surface of the shield machine that penetrates the ground. There is a device to avoid it. In addition, a method is adopted in which the earth retaining wall in the part where the wellhead is formed is cut using, for example, poorly-mixed concrete, and the retaining wall is directly cut by the shield machine to enter the reach shaft There is also a case.

  And it is necessary for the shield machine to reach the wellhead of the reaching shaft with high accuracy, and the gap inside these wells is interposed between the outer peripheral surface of the shield machine and the inner peripheral surface of the wellhead. Since the wellhead ring for attaching the entrance seal member is installed, the entrance seal member and the wellhead ring will be damaged if the shield tunneling machine reaches the wellhead in a state where it exceeds the allowable error from the designed original position. There is a case.

  On the other hand, surveying in the direction of digging by the shield machine is generally performed from the start shaft side through the tunnel tunnel, and a method of detecting the position and orientation of the shield machine at the tip is adopted, but when the digging distance becomes long Surveying errors immediately before arrival may also increase. In particular, when secondary lining concrete is not formed in the tunnel, or when high arrival accuracy is required at the time of arrival, such as when the destination side is subject to location restrictions, for example, increasing the number of surveys, etc. Strict surveying has been managed, but its reliability is limited.

For this reason, the method of measuring the position of the shield machine which has approached the reaching shaft from the reaching shaft side has also been developed (see, for example, Patent Document 1). In the arrival position measuring method of Patent Document 1, a boring hole is formed from the reaching shaft toward the shield machine, a receiving sensor is attached to the tip of the bore hole, and a transmission coil is attached to the rotary cutter of the shield machine. The electromagnetic wave from the transmission coil of the rotary cutter is detected by the receiving sensor, and the relative position between the reaching shaft and the shield machine is measured.
JP-A-3-246383

  However, in the arrival position measurement method described in Patent Document 1, the receiving sensor and the transmission coil are arranged in a non-contact state with a natural ground interposed, so an error may occur depending on the state of the excavated ground. Its reliability is not enough. Therefore, it is desired to newly develop a reliable and accurate measurement method that can physically confirm the positional deviation of the shield machine from the reach shaft side.

  The present invention is a shield drilling machine that can accurately and accurately measure the position of the shield tunneling machine when entering the tunnel of the reaching shaft by physically confirming the positional deviation of the shield tunneling machine from the reaching shaft side. It aims at providing the arrival position measurement method of a machine.

  The present invention is a reaching position measuring method for a shield machine that measures the position of the shield machine from the side of the reach shaft before the shield machine that reaches the reach shaft enters the tunnel of the reach shaft. The shield tunneling machine has a predetermined excavation line and / or a predetermined distance in the radial direction from the planned drilling line along the reaching direction of the shield tunneling machine from the wall of the reaching shaft to the ground. Conductive wiring is buried in a predetermined length, and it is confirmed by the energization confirmation means connected to the conductive wire that the conductive wire is cut by the rotary cutter of the shield machine and cuts off current. By achieving a method for measuring the arrival position of the shield machine that measures the deviation of the shield machine from the planned excavation peripheral line, the above object is achieved. That.

  Further, the arrival position measuring method of the shield machine according to the present invention may be configured such that a plurality of the conductive wires constitute a group of wires arranged in a row at intervals in the radial direction of the planned excavation outer circumferential line. preferable.

  Furthermore, in the reaching position measuring method of the shield machine of the present invention, the plurality of conductive wires constituting the wire group are arranged at least one of the conductive wires inside the planned excavation outer peripheral line, It is preferable that they are arranged in a row across both radial sides across the planned excavation outer circumference.

  Furthermore, in the reaching position measuring method of the shield machine according to the present invention, it is preferable that the wire group is arranged at least at three positions with a spacing in the circumferential direction of the planned excavation outer circumferential line.

  And, the arrival position measuring method of the shield machine according to the present invention is a method in which a plurality of sets of electric wires having different wiring lengths embedded in the ground are spaced apart in the circumferential direction of the planned excavation outer circumference. Are preferably arranged.

  Further, the shield position machine measuring method of the shield machine according to the present invention is characterized in that after rotating at least one of the conductive wires constituting the wire group by the rotary cutter, the rotation is performed while projecting a copy cutter from the rotary cutter. The electric wire for electric conduction located in the next radial outside can also be cut by rotating the cutter.

  Furthermore, in the reaching position measuring method of the shield machine according to the present invention, the energization confirmation means is composed of a light bulb connected to a wiring path including the conductive wire, and the light bulb is provided in a work yard on the reach vertical shaft side. It is also possible to check the cutting of the conductive wire by turning on the position display board and extinguishing the light from the light bulb.

  According to the arrival position measuring method of the shield machine of the present invention, by physically confirming the positional deviation of the shield machine from the arrival shaft side, the position of the shield machine when entering the tunnel of the arrival shaft, Accurate and reliable measurement is possible.

  A shield tunneling machine according to a preferred embodiment of the present invention includes a shield tunneling machine that tunnels toward a tunnel shaft 12 as shown in FIG. 1 in a shield tunnel construction method using a mud pressure shield tunneling machine, for example. 11, the position of the shield machine 11 approaching the reach shaft 12 is measured with high accuracy so as to reach the reach shaft 12 through the wellhead 14, while the position of the shield machine 11 is corrected as necessary. It is adopted in order to effectively avoid breakage of the wellhead ring 13 attached to the peripheral portion of the wellhead 14 and the entrance seal member (not shown) supported by this by entering the inside of the 12 wells. It is a thing.

  And the arrival position measuring method of the shield machine 11 of this embodiment makes the position of the shield machine 11 reach | attain the reach shaft prior to making the shield machine 11 reaching the reach shaft 12 enter the inside of the reach shaft 12. 12 from the side wall 12a of the reach shaft 12 and into the ground, on the planned excavation outer periphery 15 (see FIG. 2) of the shield machine 11 and / or from the planned excavation outer periphery 15 The conductive wire 10 is buried and wired in a predetermined length along the arrival direction X by the shield machine 15 at positions spaced apart by a predetermined distance in the radial direction, and the conductive wire 10 is rotated by the shield machine 11. By checking, for example, with a light bulb 16 as an energization confirmation means connected to the conductive wire 10, the shield machine 1 is cut off by the cutter 11 a. Deviation from expected excavation peripheral line 15 of and measures the.

  Further, in the present embodiment, as shown in FIG. 2, a plurality of conductive wires 10 are arranged in a line at intervals in the radial direction Y of the planned excavation outer peripheral line 15, thereby configuring the wire group 20. ing.

  Further, in the present embodiment, the plurality of conductive wires 10 constituting the wire group 20 are arranged such that at least one (two in the present embodiment) conductive wires 10 are disposed inside the planned excavation outer peripheral line 15. In addition, they are arranged in a line over both sides in the radial direction Y across the planned excavation outer circumferential line 15.

  Furthermore, in this embodiment, the electric wire group 20 is arrange | positioned at at least 3 places (4 places in this embodiment) at intervals in the circumferential direction of the excavation planned outer circumference line 15.

  In the present embodiment, the shield machine 11 is known as, for example, a mud pressure shield machine, and as shown in FIG. 1, the shield machine 11 is assembled from the segment 17 that is assembled inside the outer body 11b and sequentially installed rearward. While obtaining the reaction force, the shield jack 11c is expanded and contracted, and the cutter motor 11d is driven to rotate the rotary cutter 11a, so that the excavation work is performed while cutting the face of the natural ground, and the starting shaft and the reaching shaft 12 are In this method, a tunnel is formed by a large number of segments 17 arranged in series. Moreover, in this embodiment, the shield machine 11 is provided with a copy cutter 21 that protrudes and retreats from the peripheral surface of the rotary cutter 11a so that the protrusion amount can be controlled, and the cutter surface by the rotary cutter 11a is provided by this copy cutter 21. The outer surface of the outer wall can be deepened according to the protruding length.

  The reach shaft 12 is formed so as to be surrounded by a retaining wall 18 constructed by a continuous wall by, for example, an SMW (cement mixing wall) method, and the side wall surface has a circular shape by the shield machine 11. A well opening 14 having a slightly larger diameter than the planned excavation outer peripheral line 15 is formed on the extension of the cross section of the planned excavation outer peripheral line 15, and the shield excavator 11 is inserted into the shaft of the reaching vertical shaft 12 through the well opening 14. To enter.

  Here, before the shield machine 11 reaches the reaching shaft 12, the well port 14 of the reaching shaft 12 is subjected to, for example, ground improvement on the ground around the shaft 14 to form the improved ground 19, and then the retaining wall An opening is formed by applying a mirror cut to the wall surface 12 a of the reaching shaft 12 by 18. In addition, the wellhead 14 has been cut in the mirror, and then the concrete well 14a is placed along the inner peripheral surface of the opened opening portion, so that the shape of the outer peripheral line 15 scheduled for excavation by the shield machine 11 is met. It is formed as a concentric circular opening. Moreover, while attaching the wellhead ring 13 along the inner peripheral edge part of the wellhead 14, for example, the inside of the wellhead ring 13 is covered with the wellhead cover 22, and in the space between the wellhead cover 22 and the improved ground 19, for example, By filling curable fluidized soil that can be cut by the shield machine 11 as the filler 23, the improved ground 19 is firmly stabilized, and the standby state until the shield machine 11 reaches the arrival shaft 12 It becomes.

  And in this embodiment, after each conductive wire 10 performs mirror cutting on the wall surface 12a of the reaching shaft 12, for example, until the filler 23 is filled in the space between the well cover 22 and the improved ground 19 In the meantime, from the wall surface 12a of the wellhead portion 14 after the retaining wall 18 is removed to the improved ground 19, for example, with a length L of 2.0 m, along the reaching excavation direction X by the shield machine 11, Each will be buried in the ground so as to be parallel to this.

  In order to embed and install each conductive wire 10 in the ground, for example, the conductive wire 10 is preferably formed by reciprocating a predetermined length by connecting three pairs of 6-core cables with two cores at the tip. As shown in FIG. 3 (a), the conductive wire 10a has a cross-sectional shape having a width of 30 mm and a thickness of 8 mm, for example, on both sides of the pier 24 having a length of 2.0 m or more. Along the end face 24 a, for example, a joint is disposed over a length of 2.0 m or more from the tip of the pier 24. On the other hand, for example, from the wall surface 12a of the reaching shaft 12 toward the improved ground 19, the electric wire groups 20 arranged at four positions on the upper and lower sides and the right and left sides at equal angular intervals of 90 degrees in the circumferential direction of the planned excavation outer circumferential line 15 (FIG. 2). As shown in FIG. 3 (b), the perforation 25 for inserting the crosspiece 24 is drilled at a pitch P1 of 60 mm, for example, using a boring device having a hole diameter of 42 mm, for example. They are formed side by side at a depth of 2.0 m or more on each side of the sandwiched radial direction Y.

  Then, while the longitudinal direction of the pier 24 is aligned with the radial direction Y of the outer circumferential line 15 to be excavated, one side so that the conductive wire 10 joined to the both end faces 24a of each pier 24 contacts the inner peripheral surface of the perforation 25 In this state, the crosspiece 24 is inserted into each perforation 25 so that the tip of the conductive wire 10 is disposed at a depth of 2.0 m. As a result, the conductive wires 10 respectively joined to the end surfaces 24a on both sides of each pier 24 are arranged in the radial direction Y at two locations on both sides of the planned outer excavation line 15 in each of the upper, lower, left and right electric wire groups 20. For example, they are arranged at a pitch of 30 mm while being arranged in a straight line.

  Further, when the conductive wires 10 are inserted and arranged in the respective perforations 25 through the piers 24 in this way, the respective conductive wires 10 are formed in the perforated 25 by filling the perforated 25 with, for example, the poor blended mortar 26 and curing it. Each embedded wiring is fixed in a state where it is fixed to the wiring. Furthermore, in this embodiment, the end of the conductive wire 10 opposite to the side inserted in the perforation 25 extends to the inside of the reaching shaft 12, and is preferably provided in a work yard in the inside of the shaft. Further, the control position display board 27 (see FIG. 1) is connected to each of the light bulbs 16 arranged corresponding to the embedded positions of the conductive wires 10. As a result, as shown in FIG. 4, each light bulb is subjected to a period in which voltage is applied to each wiring path 28 including the conductive wire 10 and the light bulb 16 until the shield machine 11 reaches the buried position of the conductive wire 10. 16 can hold the lighted state.

  And according to this embodiment, when the shield machine 11 approaches the reach shaft 12, for example, within a distance of 2.0 m or less, the conductive wire 10 is shielded so that the shield machine 11 reaches the reach shaft 12. By confirming that the energization is cut off by the rotary cutter 11a of the excavator 11 by turning off the light bulb 16 connected to the conductive wire 10, the shield excavator 11 is displaced from the planned excavation outer peripheral line 15. Can be easily measured. In other words, in the present embodiment, the conductive wire 10 is embedded and wired along the ultimate excavation direction X by the shield excavator 11 at positions spaced apart from the planned excavation outer circumferential line 15 inward and outward in the radial direction Y by a predetermined distance. Therefore, for example, as shown in FIG. 5, in the position display plate 27 in the underground shaft 12, the light bulb 16 communicated with the conductive wire 10 constituting the wire group 20 arranged on the right side of the planned excavation outer peripheral line 15. Among them, the light bulb 16 disposed outside the planned excavation outer peripheral line 15 is turned off, so that the conductive wire 10 disposed outside the planned excavation outer peripheral line 15 is physically cut directly by the rotary cutter 11a. As a result, it is possible to measure the positional deviation of the shield machine 11 within an error range of a pitch of, for example, 30 mm where the conductive wire 10 is disposed. .

  Therefore, according to the present embodiment, the positional displacement of the shield machine 11 from the arrival shaft 12 side is physically confirmed, so that the position of the shield machine when entering the shaft of the arrival shaft 12 can be accurately and reliably determined. It becomes possible to measure.

  Moreover, in this embodiment, since at least one of the plurality of conductive wires 10 constituting the wire group 20 is disposed inside the planned excavation outer peripheral line 15, the shield machine 11 extends to the reaching shaft 12, for example. When approaching a distance of 2.0 m or less, any one of the conductive wires 10 arranged inward is surely cut, and thus the approach of the shield machine 11 can be reliably detected. It becomes possible.

  Furthermore, in the present embodiment, the electric wire groups 20 in which the conductive wires 10 are arranged in a row in the radial direction Y of the planned excavation outer circumferential line 15 are arranged in at least three locations in the circumferential direction of the planned excavation outer circumferential line 15. Thus, it is possible to reliably detect the positional deviation of the shield machine 11 in the vertical direction and the horizontal direction.

  Furthermore, in this embodiment, after cutting at least one of the conductive wires 10 constituting the wire group 20 with the rotary cutter 11a, the rotary cutter 11a is rotated while the copy cutter 21 is projected from the rotary cutter 11a. By cutting the conductive wire 10 located outside the next radial direction and detecting the protruding amount of the copy cutter 21 during this time, for example, rather than measuring the displacement by the conductive wire 10 arranged at a pitch of 30 mm. Furthermore, it becomes possible to measure the positional deviation of the fine shield machine 11.

  In the present embodiment, as a plurality of sets of electric wire groups 20 composed of conductive wires 10 having different embedded wiring length L to the ground, for example, the embedded wiring length L is 2.0 m, 1.5 m, 1.m. It is also possible to arrange a plurality of sets 20 of the conductive wires 10 having a length of 0 m and 0.5 m at intervals in the circumferential direction of the planned excavation outer circumferential line 15, for example, at four locations each. As a result, as the shield machine 11 approaches the reaching shaft 12, the position of the shield machine 11 is measured, the direction of the shield machine is corrected, and the return of the position error is confirmed, with higher accuracy. It is possible to reach the reaching shaft 12.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the conductive wires do not necessarily need to be arranged in a line at intervals in the radial direction of the planned excavation outer circumference line. It is also possible to provide them at random positions at predetermined intervals. Further, the present invention is not limited to the mud pressure shield excavator, but can also be adopted to make various other shield excavators such as a mud shield shield excavator reach the reaching shaft. Further, various means other than the method using the pier can be adopted as means for burying and installing each conductive wire 10 in the ground, and the energization confirmation means is not necessarily required to turn off the light bulb. Absent. Furthermore, each conductive wire 10 is a closed circuit. However, at the portion to be cut, it is possible to keep the wire in a single state. When the electricity passes through the ground, the conductive wire 10 is cut. However, it is preferable in that it can be effectively avoided that the conduction is not cut off.

It is a schematic sectional drawing explaining the arrival position measuring method of the shield machine which concerns on one preferable embodiment of this invention. FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG. 1 for explaining the arrival position measuring method of the shield machine according to a preferred embodiment of the present invention. (A) And (b) is sectional drawing explaining the method to embed and install the electric wire for conduction in the ground. It is explanatory drawing of each wiring path | route including a conductive wire and a light bulb. It is explanatory drawing of the condition which confirms the position shift of a shield machine in a position display board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Conductive wire 11 Shield machine 11a Rotating cutter 12 Reaching shaft 12a Reaching shaft wall 13 Wellhead ring 14 Wellhead 14a Wellhead concrete 15 Scheduled outer circumference line 16 Light bulb (energization confirmation means)
17 Segment 18 Retaining Wall 19 Improved Ground 20 Wire Group 21 Copy Cutter 22 Mouth Cover 23 Filling Material 24 Pier 25 Drilling 26 Poor Mixing Mortar 27 Position Display Board 28 Wiring Route X Reached Drilling Direction Y by Shield Engraver Diameter of Drilling Outer Peripheral Line direction

Claims (7)

Prior to making the shield machine reaching the reach shaft enter the tunnel of the reach shaft, the shield machine reach position measuring method for measuring the position of the shield machine from the reach shaft side,
Conducted along the arrival direction of the shield excavator at a predetermined distance in the radial direction from the planned excavation peripheral line of the shield excavator and / or on the planned excavation outer periphery line of the shield excavator from the wall of the reach shaft to the ground Wires for burial with a predetermined length,
By confirming that the electric wire for conduction is cut by the rotary cutter of the shield machine and cut off the electric current by means of energization confirmation means connected to the electric wire for electric conduction, from the planned excavation outer circumference line of the shield machine A method for measuring the arrival position of a shield machine that measures the displacement of the shield.   The reaching position measuring method for a shield machine according to claim 1, wherein the plurality of conductive wires constitute a group of wires arranged in a row at intervals in the radial direction of the planned excavation outer circumference.   A plurality of the conductive wires constituting the wire group are arranged in a row across both radial sides of the planned excavation outer circumferential line, with at least one of the conductive electric wires being arranged inward of the planned excavation outer peripheral line. The arrival position measuring method of the shield machine according to claim 2, which is disposed in   The arrival position measuring method of the shield machine according to claim 2 or 3, wherein the electric wire group is disposed at least at three positions with a space in the circumferential direction of the planned excavation outer circumferential line.   5. The plurality of sets of the electric wire groups made of conductive wires having different embedded wiring lengths in the ground are arranged at intervals in the circumferential direction of the planned excavation outer circumferential line. How to measure the arrival position of the shield machine.   After cutting at least one of the conductive wires constituting the wire group by the rotary cutter, the rotary cutter is rotated while projecting a copy cutter from the rotary cutter, and is positioned outside in the next radial direction. The reaching position measuring method for a shield machine according to any one of claims 2 to 5, wherein the conductive wire is cut. The energization confirmation means comprises a light bulb connected to a wiring path including the conductive wire, and the light is turned on on a position display plate provided in the work yard on the reaching shaft side, and the light of the light bulb is extinguished. The reaching position measuring method of the shield machine according to any one of claims 1 to 6, wherein the cutting of the conductive wire is confirmed.

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