JP2008031844A - Competition situation measuring device in tail part of shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a competition situation measuring method in a tail of a shield machine and a device therefor which can provide in real time the knowledge of a competition situation between a tail seal and lining work which is squeeezed in the tail seal. <P>SOLUTION: A plurality of pressure sensors 12 are circumferentially provided at the tail-seal attaching part of the tail of the shield machine at predetermined intervals. When excavation is performed by reaction force while extruding the lining work 20 which is extended by a segment assembled in the tail, pressure distribution in the tail is measured from pressure data from each pressure sensor 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the shield machine, the segment is assembled in the tail portion of the shield machine to extend the lining, and when digging while pushing the digging machine by taking a reaction force against this, the center line direction of the lining is The present invention relates to a method and an apparatus for measuring a competition situation in a tail portion in a shield machine for measuring a competition situation between a lining and an inner surface of a tail portion, which is caused by a shift in a center line direction of the shield machine.

  In general, in the shield method, the segments are assembled in a ring shape on the inner surface of the tail portion of the shield machine to extend the lining, and a reaction force is applied to this to dig while pushing the machine. Since the outer diameter of the lining to be assembled in the shield machine is smaller than the inner diameter of the skin plate of the shield machine, there is a gap (hereinafter referred to as tail clearance) according to the construction situation.

  For this reason, in the tail portion, in order to prevent the underground water and the back material from entering the shield machine from the tail clearance, as shown in FIG. A tail seal 3 that is in sliding contact with the surface is provided. The tail seal 3 is generally provided with ring-shaped wire brushes 4, 4 that are continuous in the circumferential direction in two to three stages, a protective spring 6 is installed on the front side of each wire brush 4, and In each wire brush 4 and between both wire brushes 4, 4, a tail grease 5 is used.

  In tunnel construction in such a shield machine, when the vertical and horizontal curves are constructed, the shield machine 7 is assembled in the center line direction X1 and inside thereof by controlling the shield direction of the shield machine 7 as shown in FIG. An angle is generated in the center line direction X2 of the lining 2, and the rear end of the lining is biased in any of the circumferential directions within the tail clearance, but the bias is absorbed by the elasticity of the tail seal 3, Curve construction is possible within the allowable absorption range.

  In the conventional shield machine as described above, curved construction is possible within the range of friction of the tail seal, but it is impossible to visually check how the tail seal collapses, Tail grease leaks during digging construction, the backing material is clogged between the wire brushes, the friction range of the tail seal is often smaller than the original, and it can not withstand the preset curve construction, If the excavation is continued forcibly, the propulsion power of the shield excavator will increase and the lining and tail seal will be damaged.

  As a result, the damaged segment cannot be replaced, and a large-scale repair work occurs as a subsequent work. In addition, when the secondary lining omission segment is adopted, in addition to repairing the damaged portion, significant design changes such as the equipment and the layout thereof are required.

  For this reason, in actual curve construction, a. Measurement of clearance between lining and face by segment assembly b. Shield survey machine direction surveying and lining work type surveying c. Estimate the degree of competition between the tail seal and the lining pushed out from the operating data such as the thrust of the shield machine, and judge whether the next drill direction control instruction and segment allocation plan are appropriate However, since the work will be at one end (half day) or at the end of the day work, lack of real-time performance, if sufficient work type and direction control effect could not be obtained, subsequent segment allocation, A major review is necessary for linear management in the direction of excavation.

  Also, if management concentrates only on the direction control during excavation, the lining on the segment assembly side competes strongly against the tail seal, making it impossible to assemble the segments prepared for the next assembly operation. There were problems such as being unable to deal with the base inventory segment and being forced to produce a separate segment for correction.

  In view of such a conventional problem, the present invention prevents excessive competition with the lining in the tail portion in real time, so that damage to the tail seal and lining and the situation where the segments cannot be assembled can be avoided. It is an object of the present invention to provide a method and a device for measuring a competition state in a tail part of a shield machine, which can know in real time the state of competition between a tail seal and a lining pushed inside.

  A feature of the present invention for solving the conventional problems as described above and achieving an intended purpose is that a plurality of tail seal attachment portions of the shield machine tail portion are arranged at predetermined intervals in the circumferential direction. When installing a pressure sensor consisting of a strain cage and digging while pushing out the excavator by taking reaction force against the lining by the segments assembled in the tail part, the shield excavator from the pressure data from each pressure sensor It is to measure the distribution of pressure from the lining applied to the tail part.

  In addition, a plurality of pressure sensors may be provided at intervals in the axial direction of the shield machine at each sensor attachment position in the circumferential direction, and on the inner surface of the skin plate of the tail seal attachment part in the shield machine tail part, A number of elongated sensor support rods oriented in the axial direction are installed at regular intervals in the circumferential direction, and pressure sensors composed of strain cages are fixed to the sensor support rods at regular intervals in the longitudinal direction. Or, embed a large number of strain sensors in the skin plate thickness in the form of elongated rod-shaped strain cages in the axial direction at regular intervals in the circumferential direction. A large number of pressure sensors consisting of strain cages are embedded in the fixed tail seal at regular intervals in the circumferential direction at regular intervals. Preferred.

  As described above, in the competitive state measurement method in the tail portion of the shield machine according to the present invention, a plurality of pressure sensors are provided at a predetermined interval in the circumferential direction at the tail seal attachment portion of the shield machine tail portion. When digging while pushing out the lining by the segment assembled in the tail portion, measuring the pressure distribution in the tail portion from the pressure data from each pressure sensor has the following effects .

That is, during the excavation, it is possible to estimate the degree of competition between the skin plate tail portion and the segment, and it is possible to effectively contribute to the determination of the appropriateness of the segment allocation that matches the enforcement state at an early stage and the direction control.
B) Since the stress distribution can be grasped in real time, it is possible to prevent the occurrence of cracks and breakage of segments due to competition and excessive thrust increase.
C) Know the timing of tail grease replenishment and can plan quantitatively.
D. By analyzing the measurement data for each construction, it is possible to contribute to the determination of the optimum design clearance amount.

  In addition, a large number of elongated sensor support rods facing in the axial direction are installed on the inner surface of the skin plate of the tail seal mounting portion of the shield machine tail portion at regular intervals in the circumferential direction. By fixing the pressure sensor at regular intervals in the direction, the stress of the skin plate due to the surrounding earth pressure on the skin plate can be ignored, and the competitive state of the lining against the tail seal can be accurately measured, and Since the sensor support rod can be used as a main unit and the sensor and wiring can be integrated into the unit, the wiring is not exposed on the surface, and management without any discomfort from conventional work becomes possible.

  Furthermore, by embedding a number of elongated rod-shaped pressure sensors in the axial direction at regular intervals in the circumferential direction within the skin plate thickness of the tail seal attachment portion of the shield machine, The stress distribution of the entire plate tail can be measured, and the sensor is not exposed to the inner surface of the tail, thereby preventing damage during excavation work.

  In addition, by burying a number of pressure sensors at regular intervals in the circumferential direction on the tail seal fixed to the inner surface of the shield tunneling machine tail, a number of pressure sensors are embedded at regular intervals in the circumferential direction. It is possible to accurately grasp, to know the exact competitive situation, and to properly grasp the change in the flexibility of the tail seal.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show a first embodiment of the present invention. In the figure, 10 is a skin plate of a shield excavator. On the inner surface of the tail portion of the skin plate 10, a large number of sensor support rods 11 directed in the axial direction are provided at regular intervals in the circumferential direction.

  As shown in FIG. 2, each of the sensor support rods 11 is embedded with a pressure sensor 12 made up of a number of ultra-thin load cells (foil strain gauges) at regular intervals. A groove-shaped wiring duct 13 is formed on the back surface of the sensor support rod 11 in the longitudinal direction, and lead wires 14 connected to the pressure sensors 12 are embedded in the duct.

  As shown in FIG. 3, each sensor support rod 11 is fitted in a concave groove 16 formed on the inner surface of the tail portion of the skin plate 10, and is installed so that the strain of the skin plate 10 due to earth pressure is not transmitted. . On the outer surface of each concave groove position of the skin plate 10, a reinforcing overlay 15 is provided.

  In this way, a large number of pressure sensors 12 are installed on the inner peripheral surface of the tail portion of the skin plate 10 at intervals in the axial direction and the circumferential direction, and inside the wire brush 17 and the tail grease as shown in FIG. A tail seal 19 consisting of 18 is installed.

  In this apparatus, the pressure from the lining 20 applied to the tail portion of the shield machine through the tail seal 19 is detected by each pressure sensor 12, the pressure data is totaled, and the lining of the skin plate 10 is competing for lining. I try to judge the situation.

  FIG. 5 shows a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as 1st embodiment, and detailed description is abbreviate | omitted. In this embodiment, a pressure sensor 21 made of a so-called rod-shaped strain gauge having a slender rod shape is embedded in the thickness of the tail portion of the skin plate 10 in the axial direction. Although not shown in detail in the drawing, a large number of pressure sensors 21 are arranged at substantially equal intervals in the entire circumferential area of the skin plate at regular intervals in the circumferential direction.

  The tail seal 19 is fixed to the inner surface of the tail portion of the skin plate 10 in which a large number of pressure sensors 21 are embedded in the same manner as in the prior art.

  Once the shield machine has entered the ground, the segments are assembled continuously, so that the tail part is placed on the outer peripheral surface of the lining 20 as shown in FIG. 5 until the planned point is reached. When the wire brush 17 is in contact, the tail grease 18 permeates the wire brushes 17 and 17 on both sides, and maintains the water stop effect to prevent the inflow of groundwater and backing material and the rust preventive effect of the wire brush and the like. I am doing so.

  However, in combination with the penetration into the wire brush 17, the outflow to the outside and the adhesion and solidification of mud and backing material from the outside to the wire brush 17 occur at the same time. The effect of can not be expected. Moreover, in sharp curve construction, the clearance is extremely small, and the lining competes with the skin plate. Under such circumstances, the force that the lining 20 acts on the skin plate 10 also increases, resulting in cracking and breakage of the segments.

  In this apparatus, the pressure applied to the skin plate tail portion via the tail seal 19 is measured by detecting the strain of the skin plate 10, the pressure data is aggregated, Thus, a decrease in flexibility of the wire brush of the tail seal 19 is estimated.

  FIG. 6 shows a third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as 1st embodiment, and detailed description is abbreviate | omitted. In this embodiment, a tail seal 19 is fixed in the tail portion of the skin plate 10 as in the prior art, and a pressure sensor 23 made of a strain gauge is fixed to the inner surface of the protective spring 22 on the front side of the first-stage wire brush 17. . Although not shown in detail in the drawing, a large number of pressure sensors 23 are arranged in the entire circumferential area of the skin plate at regular intervals in the circumferential direction.

  In this apparatus, the wire brush 17 becomes flexible within the clearance between the lining 20 and the skin plate 10 and follows the clearance amount. However, as shown in FIG. 6, the solid material 24 such as the backing material flows into the base portion of the wire brush 17, and as the solidification starts, the wire brush 17 gradually becomes large and the bending margin of the wire brush 17 disappears. Then, stress is applied to the lining 20 and a strong competition occurs. At this time, the wire brush 17 and the protection spring 22 are stressed more than the normal bending state, which is detected by each pressure sensor 23, and the pressure data is totaled to measure the pressure distribution over the entire circumference. And determine the state of competition.

  Although the pressure sensor 23 is not shown in detail in the drawing, a strain gauge can be used as an example.

It is a perspective view which shows schematic structure of 1st embodiment of this invention. It is a perspective view which shows a sensor support rod same as the above. It is a partial expanded sectional view which shows the sensor support state with respect to a skin plate same as the above. It is sectional drawing of a use condition same as the above. It is a fragmentary sectional view showing a second embodiment of the present invention. It is a fragmentary sectional view showing a third embodiment of the present invention. It is sectional drawing which shows the tail seal of the conventional shield machine. It is a top view which shows the curve construction state of the conventional shield machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Skin plate 11 Sensor support rod 12,21,23 Pressure sensor 13 Wiring duct 14 Lead wire 15 Concave groove 16 Overlay 17 Wire brush 18 Tail grease 19 Tail seal 20 Covering 22 Protection spring 24 Solid matter

Claims (3)

  A pressure sensor consisting of a plurality of strain cages is installed at a predetermined interval in the circumferential direction at the tail seal attachment part of the shield machine tail part to counteract the lining by the segments assembled in the tail part. Shielding machine characterized by measuring the distribution of pressure from the lining on the tail part of the shield machine from the pressure data from each pressure sensor when digging while pushing out the machine Method for measuring the status of competition in the tail section.    The method for measuring a competition state in a tail portion of a shield machine according to claim 1, wherein a plurality of pressure sensors are provided at intervals in the axial direction of the shield machine at respective pressure sensor mounting positions in the circumferential direction.   A number of pressure sensors consisting of strain cages are embedded at regular intervals in the circumferential direction on the tail seal fixed to the inner surface of the tail portion of the shield machine. A competition situation measuring device in a tail part in a shield machine, characterized in that a pressure distribution from the lining on the tail part of the shield machine can be measured from pressure data.

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