TWI763805B - Shield tail gap measuring device and shield shell - Google Patents

Abstract

The shield tail gap measuring device (10) of the present invention is configured to include a base part (16), a rotation shaft part (17) supported by the base part (16), a rotation angle sensor (18), and a rotation shaft part (17) A contact hand (19) integrated into one body, and a rotary push mechanism (20) for imparting a rotary push force to the contact hand (19). The rotary push mechanism (20) is provided with a reversing mechanism (20a) capable of releasing the rotary push force to rotate the rotary shaft portion (17) in the opposite direction, and to make the contact hand (19) face the center of the shield shell (12) The rotation shaft portion (17) is rotated by the way of the opposite side of the shaft, so that the contact hand portion (19) can be accommodated in the height range of the base portion (16).

Description

Shield tail gap measuring device and shield shell

The present invention relates to a shield tail clearance measuring device and shield casing for measuring the shield tail clearance between a shield casing held by a submersible shield machine, and the outer peripheral surface of a ring piece assembled at the rear of the shield casing.

The submerged shield construction method is the following process: on the one hand, the cutting end face of the front end of the submerged shield machine is pressed against the front end of the submerged shield machine, while the foundation is excavated with a cutter, and the tunnel lining body composed of rings is assembled at the rear of the submerged shield machine on the other hand. , one side from the start shaft to the end shaft to form a tunnel in the ground; this process is widely used as a process for major tunnel engineering in urban areas or plain areas. The submerged shield machine used in the submerged shield construction method is equipped with a rotary cutter for cutting the excavation surface in front of a metal outer casing called a shield shell, or a partition, a cutter drive device, a soil removal mechanism, etc. The rear part of the shell is equipped with a propelling jack and an installation device. The installation device is used to assemble the tunnel lining body composed of ring pieces. The self-assembled tunnel lining body obtains a reaction force, and the shield shell and the rotary cutter are pushed together by the propelling jack. Thereby, the tunnel is drilled while cutting the excavation surface. In addition, a gap called the shield tail gap is maintained between the outer peripheral surface of the assembled tunnel lining and the inner peripheral surface of the shield shell covering the rear portion, so that when the submersible shield machine is moved forward, The shield shell can be smoothly moved forward along the outer peripheral surface of the tunnel lining body while retaining the tunnel lining body. When constructing the curved part, the remaining gap can be used to gradually move the shield shell relative to the tunnel lining body. Go in the direction of the bend. Furthermore, in order to prevent soil sand or groundwater from flowing into the interior of the submersible shield machine from the surrounding ground through the shield tail gap, a tail seal composed of, for example, a flexible annular member is placed on the tunnel lining body and the shield in the shield tail gap. A plurality of casings are installed at intervals in the axial direction of the casing. On the other hand, in such a submersible shield machine, it is important to measure the quality of the tunnel lining to prevent deformation or breakage of the ring due to the interference of the tunnel lining in the tail and the shield shell, for example. The amount of gap between the shield tail gap and its changes are grasped. Also, when constructing the curved portion, in order to be able to change the advancing path at a planned angle, it is important to maintain the clearance amount of the shield tail clearance within a specific range, and to measure the clearance amount of the shield tail clearance and grasp the change. Therefore, various apparatuses and methods for measuring the shield tail gap have been proposed (for example, refer to Patent Documents 1 to 6, etc.). Here, the shield tail gap measuring device described in Patent Document 1 measures the amount of clearance of the shield tail gap by measuring the amount of movement in the longitudinal direction of a wire attached to an ejection mechanism arranged in contact with a ring piece. On the other hand, in the shield submersible machine described in Patent Document 2, the gap amount of the shield tail gap is measured by a non-contact type distance sensor. The shield tail gap measuring device described in Patent Document 3 calculates the clearance amount of the shield tail gap based on the distance to the inner peripheral surface of the ring piece measured by the distance sensor, and the shield tail gap measuring device described in Patent Document 4 uses The distance between the ultrasonic sensor and the detector in contact with the shield shell is detected by the ultrasonic sensor, and the gap amount of the shield tail gap is calculated. The measuring device of the shield tail gap disclosed in Patent Document 5 uses the distance from the sensor to the inner peripheral surface of the shield shell, the distance from the sensor to the inner peripheral surface of the ring piece, which is detected by the distance sensor. To calculate the gap amount of the shield tail gap based on the thickness of the ring piece, the shield tail gap measurement method described in Patent Document 6 is based on the image data captured by a CCD (Charge Couple Device: Charge Coupled Device) camera to calculate the shield tail gap. The gap measurer. [PRIOR ART DOCUMENTS] [PATENT DOCUMENTS] [PATENT DOCUMENTS 1] Japanese Patent Laid-Open No. 6-050036 [Patent Document 2] Japanese Patent Laid-Open No. 6-102959 [Patent Document 3] Japanese Patent Laid-Open No. 4-041895 Gazette [Patent Document 4] Japanese Patent No. 2722032 [Patent Document 5] Japanese Patent No. 3229409 [Patent Document 6] Japanese Patent No. 6026974 [Patent Document 7] Japanese Patent Laid-Open No. 2015-45165

In the above-mentioned prior device or method for measuring the gap between the shield tail, there is a problem with durability, or it is difficult to measure the gap accurately because the gap is not directly measured mechanically. Therefore, the applicant of the present application disclosed in Patent Document 7 that The shield tail gap measuring device and shield shell can continuously measure the gap amount of the shield tail gap mechanically, easily grasp the change, and have the durability that can be arranged between the tunnel lining body and the shield shell for a long period of time. , and the replacement operation can also be easily performed. However, according to the shield tail gap measuring device or the shield case described in Patent Document 7, the contact hand arranged in a state of contacting the outer peripheral surface of the ring piece from the rear side of the shield case uses the spring portion as a pushing mechanism, which is used in the measurement. It is always in the state of being pushed by the way of rotating toward the central axis of the shield shell. Therefore, as shown in Figures 9(a) and (b), if the shield shell 52 is advanced relative to the tunnel lining body 51 until the shield tail is installed When the part of the gap measuring device 50 exceeds the front end of the assembled tunnel lining body 51, the contact hand 53 protrudes from the outer peripheral surface of the tunnel lining body 51 toward the central axis side of the tunnel lining body 51 due to the force of the spring part. This becomes a hindrance when assembling the next tunnel lining body 51, or the contact hand 53 may be caught between the tunnel lining body 51 at the front end and the next assembled tunnel lining body 51 and may be damaged. Therefore, in the previous method, as shown in FIG. 9( c ), the following research was carried out: by making the shield shell 52 move forward and stay until the part where the shield tail gap measuring device 50 is installed does not exceed the assembled tunnel lining body At the position of the front end of 51, when assembling the next tunnel lining body 51, the contact hand 53 will not protrude toward the central axis side of the tunnel lining body 51 due to the force of the spring; As the length of the tunnel lining body 51 and the rear end portion of the shield shell 52 are overlapped, the length of the assembled tunnel lining body 51 and the rear end portion of the shield shell 52 becomes long. If the length of the assembled tunnel lining body 51 and the rear end portion of the shield shell 52 is longer, it will cause an obstacle in the construction of the sharply curved curved part. Therefore, it is desirable to shorten the tunnel lining body and the shield shell as much as possible. The length of the overlap of the rear end part.

The object of the present invention is to provide a shield tail gap measuring device and a shield shell, which are capable of not touching the hand even if the shield shell advances relative to the tunnel lining body to the part where the measuring device is installed exceeds the front end of the assembled tunnel lining body It will protrude toward the central axis side of the tunnel lining body than the outer peripheral surface of the tunnel lining body, which will not become an obstacle when assembling the next tunnel lining body, and can effectively restrain the assembled tunnel lining body and the rear end of the shield shell. The overlapping length becomes longer.

The present invention achieves the above object by providing a shield tail gap measuring device which is used by being fixed to a mounting recess provided in a shield casing of a submerged shield machine, and the measurement is held in the shield casing. , and the amount of clearance between the shield tail gap between the outer peripheral surfaces of the tunnel lining body composed of the ring pieces assembled at the rear of the shield shell, and constituted to include: a base part; a rotating shaft part, which is rotatable A rotation angle sensor, which detects the rotation angle of the rotation shaft part; a contact hand, which is integrated with the rotation shaft part and extends toward the rear side of the shield shell; and a rotary push mechanism, which imparts a rotary push force to the above-mentioned rotating shaft portion in such a way that the contact hand portion rotates toward the central axis side of the above-mentioned shield shell; and the above-mentioned base portion includes a chassis portion and a pair of bearing wall portions , and is formed in such a way that when it is fixed in the above-mentioned mounting recess, when viewed from the direction parallel to the central axis of the above-mentioned shield shell, it has a cross-sectional shape of the letter "U"; The two sides of the above-mentioned chassis portion are erected and integrally arranged, and are arranged to extend parallel to the central axis of the above-mentioned shield shell, and support The rotating shaft portion; and the rotating push mechanism is provided with a reversing mechanism that releases the rotating push force and rotates the rotating shaft portion in the opposite direction, so that the contacting hand rotates toward the opposite side of the central axis of the shield case. The above-mentioned rotating shaft portion is rotated in such a way that the above-mentioned contacting hand can be accommodated in the height range of the above-mentioned base portion; the portion where the above-mentioned contacting hand is accommodated, that is, the interval portion between the bearing wall portions of one pair of the base portion Among them, an air ejection mechanism for ejecting air from the upper surface of the chassis portion is provided.

Furthermore, in the shield tail gap measuring device of the present invention, preferably, the rotary push mechanism is a rotary actuator.

Furthermore, in the shield tail gap measuring device of the present invention, preferably, the rotary push mechanism is a pneumatic rotary actuator.

Furthermore, in the shield tail gap measuring device of the present invention, it is preferable that the contact hand has an arm shape including a rotating roller contact portion at the front end of the arm body portion.

In addition, the present invention achieves the above object by providing the following shield shell, which is equipped with the above-mentioned shield tail gap measuring device, and is provided with the rear end portion of the tunnel lining body composed of the assembled ring pieces, A mounting recess is formed on the inner peripheral surface, and the shield tail gap measuring device is installed so that the contact hand portion extends toward the rear side of the axial direction of the shield case, and the base portion does not protrude from the inner peripheral surface of the shield case. The state is fixed to the mounting recess.

Furthermore, in the shield tail gap measuring device of the present invention, preferably, the mounting recesses are provided at least at three locations in the circumferential direction of the rear portion at intervals, and the shield tail gap measuring device is fixed to each of the mounting recesses.

As shown in FIGS. 1 to 3 , the shield tail gap measuring device 10 according to a preferred embodiment of the present invention is installed at the rear end of the shield shell 12 constituting the outer body of the submerged shield machine 11 at intervals in the circumferential direction. It is used in at least 3 parts (in this embodiment, it is 4 parts up, down, left and right), and can detect the rotation of the contact hand 19 that is pushed in contact with the outer peripheral surface of the tunnel lining body 14 to rotate. The rotation angle of the shaft portion 17 (refer to FIG. 2 and FIG. 3 ) is continuously measured and maintained on the outer peripheral surface of the tunnel lining body 14 formed by assembling the ring pieces 13 inside the rear part of the shield shell 12 , and the inner circumference of the shield shell 12 Variation in the amount of gap between the shield tail gap 15 between the faces. The shield tail gap measuring device 10 of the present embodiment has a lightweight and simple structure, is excellent in durability, and can be easily replaced by operations from the inside of the shield case 12, so it is also excellent in maintainability. As a result, in the shield tunnel project spanning several months to several years, even when the gap between the tunnel lining body 14 and the shield shell 12 is continuously arranged for a long period of time, it can be stably The state continuously measures the gap amount of the shield tail gap 15 . In addition, the shield tail gap measuring device 10 of the present embodiment has the function of having a function that the contact hand can be moved by the rotary push mechanism 20 (refer to FIG. 4 , FIG. The reversing mechanism 20a (refer to FIG. 6(a), (b)) that releases the thrust of the rotating thrust of the contacting hand 19 in the opposite direction to the thrusting direction, even if the shield case 12 is driven by the thrust jack 35 With respect to the tunnel lining body 14, when the part where the measuring device 10 is installed exceeds the front end of the assembled tunnel lining body 14, the contact hand 19 will not face the center of the tunnel lining body 14 from the outer periphery of the tunnel lining body 14. The shaft side is protruding (see Fig. 7(b)), so when the next tunnel lining body 14 is assembled with the ring piece 13, the protruding contact hand 19 will not be an obstacle (see Fig. 7(c)). Furthermore, as shown in FIGS. 1 to 3 , the shield tail gap measuring device 10 of the present embodiment measures the shield shell 12 held by the submersible shield machine 11 and the ring piece 13 assembled at the rear of the shield shell 12 . The measuring device for the gap amount of the shield tail gap 15 between the outer peripheral surfaces of the tunnel lining body 14, and as shown in Figs. It is accommodated in the mounting recess 23 formed at the rear of the shield shell 12 and has a height preferably smaller than the wall thickness of the shield shell 12; the rotating shaft portion 17 is provided in a state of being rotatably supported on the base portion 16; the sense of rotation angle The measuring device 18 (refer to FIGS. 5( a ) and ( b )) detects the rotation angle of the rotating shaft portion 17 ; the contact hand 19 is integrated with the rotating shaft portion 17 and extends toward the rear side of the shield case 12 . ; And rotate the push mechanism 20 (refer to Fig. 4, Fig. 5 (a), (b)), which makes the contact hand 19 face the central axis side of the shield shell 12 (also the upper side of Fig. 3, the tunnel lining body 14 (the central axis side) of the rotating shaft portion 17 is provided with a rotational spring thrust. The rotary push mechanism 20 includes a reversing mechanism 20 a (see FIGS. 6( a ) and ( b )) that can release the rotary push force to rotate the rotary shaft portion 17 in the opposite direction, so as to contact the hand 19 toward the central axis of the shield case 12 On the opposite side (lower side in FIG. 3 ), the rotating shaft portion 17 is rotated so that the contact hand portion 19 can be accommodated in the height range of the base portion 16 (refer to FIG. 7( b )). In the present embodiment, the submersible shield machine 11 is, for example, a soil pressing type submerged shield machine, and as shown in FIG. 1 , has a cylindrical shape with a wall thickness of, for example, about 28 to 50 mm (50 mm in this embodiment). The metal outer shell, that is, the shield shell 12, is provided with a rotary cutter 30 at the front end, and the inner side of the shield shell 12 is provided with a soil pressure chamber 32 separated by a partition 31, a cutter drive device 33, and a screw conveyor. The soil removal mechanism 34, the push jack 35, the mounting device 36 for assembling the ring pieces, etc. In addition, the submersible shield machine 11 uses the installation device 36 to assemble the tunnel lining body 14 composed of the ring pieces 13, obtains the reaction force from the assembled tunnel lining body 14, and uses the push jack 35 to connect the rotary cutter 30 and the shield shell 12. By pushing them forward together, the excavation surface is cut, and while the cut soil and sand are discharged as soil through the soil dumping mechanism 34, the tunnel is drilled. Furthermore, in the present embodiment, when the submersible shield machine 11 is moved forward, the shield shell 12 can be smoothly moved forward along the outer peripheral surface of the tunnel lining body 14 while the assembled tunnel lining body 14 is retained, In addition, in order to cope with the construction of the curved portion, a shield tail gap 15 is maintained between the outer peripheral surface of the assembled tunnel lining body 14 and the inner peripheral surface of the rear portion of the shield shell 12 covering it. In this embodiment, by using the shield tail clearance measuring device 10 to continuously measure the clearance amount of the shield tail clearance 15 when the submersible shield machine 11 is moved forward, and grasp the change thereof, it is possible to prevent, for example, the tail portion of the shield shell 12 (rear part). end portion), the ring piece 13 is deformed or damaged due to the interference between the tunnel lining body 14 and the shield shell 12, so that the quality of the tunnel lining body 14 can be improved. Furthermore, as shown in FIGS. 3 to 5( a ) and ( b ), the shield tail gap measuring device 10 of the present embodiment is configured to include a base portion 16 , a rotating shaft portion 17 , a rotational angle sensor 18 , and a contact hand part 19 , and the rotary push mechanism 20 . In this embodiment, the rotary push mechanism 20 is preferably a pneumatic rotary actuator (refer to FIG. 6 ). The base portion 16 is formed to include, for example, a chassis portion 16a and a pair of bearing wall portions 16b and 16b (see FIG. 4 ), and has a cross-sectional shape of the letter U when viewed from a direction parallel to the central axis of the shield 12 . It has a rectangular planar shape, and the length L1 of the side arranged in the direction parallel to the central axis of the shield shell 12 is about 70 mm, and the length L2 of the side arranged in the direction perpendicular to the central axis of the shield shell 12 is about 70 mm. It is about 40mm (refer to FIG. 5(a)), and the pair of bearing wall portions 16b, 16b are separated by about 10 to 15mm in the middle portion, and are erected from the two side portions of the chassis portion 16a to be integrated and provided, and It is arranged so as to extend parallel to the central axis of the shield case 12 . The height h1 of the base portion 16 from the lower surface of the chassis portion 16a to the upper end faces of the pair of bearing wall portions 16b and 16b (refer to FIG. 4 ) is, for example, 30 mm, whereby the base portion 16 preferably has a shield of less than, for example, 50 mm. The height of the wall thickness of the shell. Furthermore, when the height of the base portion 16 of the shield tail gap measuring device 10 is larger than the wall thickness of the shield shell 12 , for example, the steel plate 23 a forming the bottom surface of the mounting recess 23 described later can be directed toward the shield shell 12 . The outer side is bulged so that the base portion 16 does not protrude further inward than the inner peripheral surface of the shield shell 12 .

In the base portion 16, the rotating shaft portion 17 is rotatably supported by the bearing wall portions 16b and 16b on both sides with a bearing mechanism 16d (refer to FIG. 5(b)) interposed therebetween, and is straddled on both sides. The bearing wall portions 16b and 16b are provided in a state of penetrating in a direction perpendicular to the central axis of the shield case 12 . The spacer portion 16c between the pair of bearing portions 16b, 16b of the base portion 16 of the U-shaped cross-sectional shape accommodates the contact hand when the contact hand portion 19 described later is rotated toward the side opposite to the central axis side of the shield case 12. The base end portion of the arm body portion 19a of the portion 19 (see FIG. 4).

12 mm左右之粗度且具有120 mm左右之長度之鋼製桿狀構件而形成，且於一端部具有較臂本體部19a略微縮徑之接合銷19b。如上所述，將接合銷19b嵌入至基台部16之一對軸承壁部16b、16b之間之間隔部分16c中形成於旋轉軸部17之中央部擴徑部17a的周面接合孔17c，且例如經由固定銷一體固定於中央部擴徑部17a，藉此，接觸手部19可伴隨旋轉軸部17之旋轉朝正方向或反方向旋動。 又，於臂本體部19a之與接合銷19b為相反側之另一端部，形成有將兩側之側面平行地進行倒角之缺口面19d，並以貫通兩側之缺口面19d之方式將旋轉支持軸19e以朝兩側突出之狀態設置。一對旋轉輥接觸部19c經由軸承機構等可旋轉地支持於自缺口面19d朝兩側突出之部分之旋轉支持軸19e，且設置於隔著臂本體部19a之另一端部之兩側。 旋轉輥接觸部19c使用具備較臂本體部19a之外徑更大之外徑之例如

20 mm左右之粗度之鋼製套筒構件而形成。旋轉輥接觸部19c藉由在介存有由多個球體構成之軸承機構的情況下安裝於朝缺口面19d之兩側突出之部分之旋轉支持軸19e，而能以旋轉支持軸19e為旋轉中心旋轉地安裝。旋轉輥接觸部19c於藉由對接觸手部19彈推之旋轉彈推機構20之作用力旋動而接觸於由環片13構成之隧道襯砌體14之外周面時能夠旋轉，故能以更順利且穩定之狀態使接觸手部19沿著隧道襯砌體14之外周面朝盾殻12之軸向移動。 於本實施形態中，如上所述，旋轉彈推機構20較佳為使用例如氣壓式旋轉致動器作為旋轉致動器。旋轉致動器係作為可調節搖動角度之裝置而公知者，亦可使用例如油壓式旋轉致動器或電動式旋轉致動器。氣壓式旋轉致動器係以氣壓為驅動源之致動器，例如作為單葉片類型者具備如圖6(a)、(b)所示之構造。圖6(a)、(b)所示之氣壓式旋轉致動器之彈推機構20構成為包含：本體40；葉片41，其於本體40之內表面滑動；旋轉軸42，其與葉片41成一體；擋止件43；及反轉機構20a，其包含成為空氣供給口之A埠及B埠，如圖6(a)所示，當自A埠供給空氣時，葉片41被按壓而對旋轉軸42產生轉矩，並且排氣側室之空氣通過B埠被排出，且例如可於葉片41碰撞到擋止件43而停止之前繞順時針方向旋轉。又，當自B埠供給空氣時，如圖6(b)所示，可同樣地繞逆時針方向旋轉。 因此，於本實施形態中，於連續測量保持於組裝環片13形成之隧道襯砌體14之外周面、與盾殻12之內周面之間的盾尾間隙15之間隙量之變化時，例如自A埠供給空氣使旋轉軸42產生轉矩，藉此可經由與旋轉軸42連結之接合銷20b對旋轉軸部17賦予旋轉彈推力，以使接觸手部19朝盾殻12之中心軸側旋動(參照圖3、圖7(a))。又，於使盾殻12相對於隧道襯砌體14前進至安裝有測量裝置10之部分超過組裝而成之隧道襯砌體14之前端時，例如藉由自B埠供給空氣使反轉機構20a作動，釋放經由旋轉軸42及接合銷20b之旋轉軸部17之旋轉彈推力，進而以使接觸手部19朝向盾殻12中心軸之相反側旋動之方式使旋轉軸部17旋轉，藉此可將接觸手部19收納於基台部16之高度範圍(參照圖7(b)、(c))內。 The rotating shaft portion 17 is preferably a metal rod-shaped member having a substantially cylindrical shape, and as shown in FIG. 5( b ), has a central portion enlarged diameter portion 17a of a central portion with an increased diameter, and a central portion enlarged diameter with a diameter smaller than that of the central portion. A pair of end portion diameter-reduced portions 17b are formed at both end portions of the portion 17a. When the rotating shaft portion 17 is attached to the base portion 16, the center portion enlarged diameter portion 17a is arranged at the interval portion 16c between the pair of bearing wall portions 16b, 16b. The diameter-reduced end portions 17b of both end portions are respectively disposed in the insertion holes 16e formed in the pair of bearing wall portions 16b, 16b in a state of being rotatably supported with the bearing mechanism 16d interposed therebetween. Moreover, in the center part enlarged diameter part 17c of the space|interval part 16c arrange|positioned between one pair of bearing wall parts 16b and 16b of the base part 16, the peripheral surface engaging hole 17c which penetrates in a radial direction is formed. An engagement pin 19b integrally protruding from one end of the arm body portion 19a contacting the hand portion 19 is fixed to the peripheral surface engagement hole 17c by being fitted. Thereby, the contacting hand portion 19 is integrally joined to the rotating shaft portion 17 so as to be rotatable together with the rotating shaft portion 17 . The end face engaging holes 17f are extended in the axial direction of the rotating shaft portion 17 on the end faces of the end portion reduced diameter portions 17b arranged on both sides of the respective insertion holes 16e formed in the pair of bearing wall portions 16b, 16b. set up. The rotation angle sensor 18 can measure the rotation angle of the rotation shaft portion 17 by inserting the sensor shaft 18a of the rotation angle sensor 18 into the end face engaging hole 17f of the one-end reduced diameter portion 17b. By inserting the engaging pin 20b of the rotating push mechanism 20 into the end face engaging hole 17f of the diameter-reduced portion 17b at the other end, the rotating shaft portion 17 can be driven by the rotating push mechanism 20 in the forward direction or in the reverse direction. direction rotation. Furthermore, as shown in FIG. 4 , each of the pair of bearing wall portions 16b and 16b of the base portion 16 is formed with through-bearings in the vertical direction at both end portions in the direction parallel to the central axis of the shield shell 12. The bolts of the wall portions 16b, 16b fasten the fixing holes 16f. By inserting bolt members (not shown) into these bolt fastening holes 16f, and fastened to the female screw fastening holes provided in the bottom surface of the mounting recess 23 described later, the shield tail gap measuring device can be installed. 10 is fixed to the mounting recess 23 so as to be detachable and replaceable. As the rotation angle sensor 18, a known sensor such as a rotary encoder or the like can be used as a sensor for detecting a difference in rotation between a rotating object and a non-rotating object. In this embodiment, as shown in FIGS. 5( a ) and ( b ), the rotation angle sensor 18 is covered by a cover 21 which is integrally mounted with the outer portion of the bearing wall portion 16 b of the base portion 16 . , and is set in a state supported and protected by the cover body 21 . The rotation angle sensor 18 can measure the rotation angle of the rotation shaft portion 17 by fitting the sensor shaft 18a into the end face engaging hole 17f of the end portion reduced diameter portion 17b of the rotation shaft portion 17 as described above. Moreover, the waterproof connector 21a is provided in the state which protrudes to the outside in the cover body 21. As shown in FIG. The sensor cable 22 (refer to FIG. 2 ) extending along the inner side of the shield shell 12 can be connected to the rotation angle sensor 18 by being introduced into the cover 21 through the waterproof connector 21 a. In this way, signals such as angle information detected by the rotation angle sensor 18 are extracted to, for example, an in-machine sequencer disk disposed inside the shield machine 11 through the sensor cable 22 . In the present embodiment, as shown in FIGS. 4 and 5( a ) and ( b ), the contacting hand portion 19 has an arm shape having a pair of rotating roller contacting portions 19c at the front end of the arm body portion 19a. For example, the arm body portion 19a that contacts the hand 19 has a

It is formed of a steel rod-shaped member with a thickness of about 12 mm and a length of about 120 mm, and has an engagement pin 19b with a slightly smaller diameter than the arm body portion 19a at one end. As described above, the engaging pin 19b is fitted into the peripheral surface engaging hole 17c formed in the central portion enlarged diameter portion 17a of the rotating shaft portion 17 in the interval portion 16c between the pair of bearing wall portions 16b, 16b of the base portion 16, And, for example, it is integrally fixed to the center portion enlarged diameter portion 17 a via a fixing pin, whereby the contact hand portion 19 can be rotated in the forward or reverse direction with the rotation of the rotating shaft portion 17 . In addition, on the other end of the arm body portion 19a on the opposite side to the engaging pin 19b, a notch surface 19d is formed by chamfering the side surfaces on both sides in parallel, and the notch surface 19d on both sides is formed so as to pass through the notch surface 19d. The support shaft 19e is provided in a state of protruding toward both sides. The pair of rotating roller contact portions 19c are rotatably supported by the rotation support shafts 19e protruding to both sides from the notch surface 19d via a bearing mechanism or the like, and are provided on both sides across the other end of the arm body portion 19a. The rotating roller contact portion 19c has a larger outer diameter than that of the arm body portion 19a.

It is formed by a steel sleeve member with a thickness of about 20 mm. The rotating roller contact portion 19c can be rotated around the rotating support shaft 19e by being attached to the rotating support shaft 19e of the portion protruding toward both sides of the notch surface 19d with a bearing mechanism formed of a plurality of spheres interposed therebetween. Installed swivel. The rotating roller contact portion 19c can rotate when it contacts the outer peripheral surface of the tunnel lining body 14 composed of the ring piece 13 by the force of the rotating push mechanism 20 that is pushed by the contact hand 19, so it can be more The smooth and stable state causes the contact hand 19 to move along the outer peripheral surface of the tunnel lining body 14 toward the axial direction of the shield shell 12 . In this embodiment, as described above, the rotary push mechanism 20 preferably uses, for example, a pneumatic rotary actuator as the rotary actuator. A rotary actuator is known as a device that can adjust the swing angle, and for example, a hydraulic rotary actuator or an electric rotary actuator can also be used. The pneumatic rotary actuator is an actuator that uses pneumatic pressure as a driving source, and for example, a single-blade type has a structure as shown in FIGS. 6( a ) and ( b ). The push mechanism 20 of the pneumatic rotary actuator shown in FIGS. 6( a ) and ( b ) is composed of: a main body 40 ; a blade 41 , which slides on the inner surface of the main body 40 ; a rotating shaft 42 , which is connected with the blade 41 The stopper 43; and the reversing mechanism 20a, which includes the A port and the B port that become the air supply port, as shown in FIG. 6(a), when the air is supplied from the A port, the blade 41 is pressed to face The rotating shaft 42 generates torque, and the air in the exhaust side chamber is discharged through the B port, and can rotate clockwise, for example, before the vane 41 collides with the stopper 43 and stops. Moreover, when air is supplied from B port, as shown in FIG.6(b), it can rotate counterclockwise similarly. Therefore, in this embodiment, when continuously measuring the change in the amount of the gap between the outer peripheral surface of the tunnel lining body 14 formed by the assembled ring piece 13 and the inner peripheral surface of the shield shell 12 in the shield tail gap 15, for example By supplying air from port A to generate torque on the rotating shaft 42 , a rotational spring thrust can be imparted to the rotating shaft portion 17 via the engagement pin 20 b connected to the rotating shaft 42 , so that the contacting hand 19 is directed toward the central axis side of the shield case 12 . Rotate (refer to Fig. 3 and Fig. 7(a) ). Furthermore, when the shield shell 12 is advanced relative to the tunnel lining body 14 until the portion where the measuring device 10 is mounted exceeds the front end of the assembled tunnel lining body 14, the reversing mechanism 20a is actuated, for example, by supplying air from the B port. The rotational thrust force of the rotational shaft portion 17 via the rotational shaft 42 and the engagement pin 20b is released, and the rotational shaft portion 17 is rotated in such a manner that the contact hand 19 rotates toward the opposite side of the central axis of the shield case 12, whereby the The contact hand portion 19 is accommodated within the height range of the base portion 16 (see FIGS. 7( b ) and ( c )).

Moreover, in this embodiment, a pair of piping port 20c (refer FIG. 4) is protrudingly provided so that it may protrude outward from the outer peripheral surface in the pneumatic rotary actuator which is the rotary push mechanism 20. As shown in FIG. Each of the piping ports 20c is continuous with the A port and the B port for supplying air to the inside of the main body 40 of the pneumatic rotary actuator 20 . By connecting each piping port 20c to the air supply piping 24 (refer to FIG. 5(a)) extending along the inner side surface of the shield case 12, the air can be pressurized while switching to the A port and the B port of the air supply port. supplied to the inside of the main body 40 .

Furthermore, in the present embodiment, as shown in FIG. 8 , the space between a pair of bearing wall portions 16b and 16b of the base portion 16 having a cross-sectional shape of the letter ℈, which is the portion of the base portion 16 that is in contact with the hand portion 19, is provided. In the portion 16c, the upper surface of the chassis portion 16a is opened and the air ejection hole 25 for ejecting air from the upper surface of the chassis portion 16a is provided as an air ejection mechanism in a state of communicating with the air supply sleeve 26 (see FIG. 4). Since the air fed from the air supply sleeve 26 is preferably continuously ejected from the air ejection hole 25 , it is possible to prevent soil sand or backfill material from accumulating on the portion of the housing contacting the hand 19 , or foreign matter intrusion. In this way, when the contacting hand 19 is rotated toward the side opposite to the central axis side of the shield case 12, it can be effectively avoided that it is difficult to accommodate the base end portion of the arm body portion 19a of the contacting hand 19 in the spacer portion 16c, and it is impossible to The contact hand portion 19 is accommodated in the height range of the base portion 16 .

In the present embodiment, the shield tail gap measuring device 10 having the above-mentioned configuration is used by being mounted on the mounting recess 23 in various fixed states (see FIGS. 1 to 3 ). The mounting recess 23 is arranged in the shield case 12 by means of The rear part of the tunnel lining body 14 constituted by the assembled ring pieces 13 is arranged at four positions, for example, up and down, left and right, at equal angular intervals of 90 degrees in the circumferential direction.

That is, in this embodiment, as shown in FIGS. 2 and 3 , in the rear part of the shield case 12 , the mounting recess 23 of the size that can accommodate the entire shield tail gap measuring device 10 is closed by welding the steel plate 23 a, for example It is formed in the outer peripheral surface side part of the through-opening which is formed in the shield case 12, and is formed in 4 places of the upper, lower, left and right. The shield tail gap measuring device 10 is placed in a state in which the contact hand 19 is extended toward the axial rear side of the shield shell 12, and the base portion 16 on which the cover body 21 or the rotary push mechanism 20 is integrally mounted is not released from the shield shell. The inner peripheral surface of 12 is fixed to these mounting recesses 23 in a protruding state. For example, the shield tail gap measuring device 10 can insert a bolt member (not shown) through and fasten a bolt member (not shown) through a female screw fastening hole formed toward a specific position of the steel plate 23a serving as the bottom surface of the mounting recess 23, for example. The fixing hole 16f is fastened to each of the pair of bearing wall portions 16b, 16b in one of the base portion 16, and the fixing hole 16f is easily fixed to the mounting recess 23 in a removable and replaceable manner. In addition, in this embodiment, on the inner side surface of the shield case 12, four mounting recesses 23 are cut and formed to extend toward the axial front side of the shield case 12, and are used for disposing the sensor cable. The groove 27 of the wire 22 or the air supply pipe 24 etc. By laying the sensor cable 22 in the groove 27, the rotation angle sensor 18 of the shield tail gap measuring device 10 disposed in the installation concave portion 23, and the internal sequencer disk disposed inside the shield machine 11, for example, are connected. connect. In addition, by laying the air supply piping 24 or the like in the groove 27, the compressed air supplied from the compressor, for example, can be supplied to the rotary push mechanism 20 of the air compression type rotary actuator, or the compressed air can be supplied from the air through the air supply sleeve 26. The ejection hole 25 ejects. After the shield tail gap measuring device 10 fixed to the mounting recess 23 as described above is assembled with the tunnel lining body 14 composed of the ring pieces 13 inside the rear part of the shield shell 12, as shown in FIG. 2 and FIG. The force of the rotating push mechanism 20 of the device keeps the rotating roller contact portion 19c in contact with the hand 19 in contact with the outer peripheral surface of the tunnel lining body 14 from the rear side of the shield shell 12 all the time. 18. The change in the rotation angle of the rotating shaft portion 17 engaging the contact hand 19 due to the change in the clearance amount of the shield tail clearance is easily detected. In addition, the shield tail gap measuring device 10 fixed to the mounting recess 23 can continuously measure the gap amount of the shield tail gap 15 and easily grasp the change, and can be arranged between the tunnel lining body 14 and the shield shell 12 for a long period of time. It has considerable durability and can also be easily replaced. In addition, according to the shield tail gap measuring device 10 and the shield shell 12 of the present embodiment having the above-mentioned configuration, even if the shield shell 12 advances relative to the tunnel lining body 14 to the part where the measuring device 10 is mounted exceeds the assembled tunnel lining body 14 At the front end, the contacting hand 19 will not protrude toward the central axis side of the shield shell 12 from the outer peripheral surface of the tunnel lining body 14, so it will not become an obstacle when assembling the next tunnel lining body 14, and can effectively prevent the assembly from being damaged. As a result, the length of the tunnel lining body 14 and the rear end portion of the shield shell 12 overlapping each other becomes longer. That is, according to the present embodiment, the shield tail gap measuring device 10 is configured to include the base portion 16 having a height smaller than the wall thickness of the shield case 12 , and the rotating shaft portion 17 rotatably supported by the base portion 16 . A rotation angle sensor 18, which detects the rotation angle of the rotation shaft portion 17; a contact hand 19, which is integrated with the rotation shaft portion 17 and extends toward the rear side of the shield case 12; The mechanism 20 imparts a rotary thrust force to the rotating shaft portion 17 in such a way that the contact hand 19 rotates toward the central axis side of the shield shell 12; The reversing mechanism 20 a that rotates in the opposite direction rotates the rotating shaft portion 17 so that the contact hand 19 rotates toward the opposite side of the central axis of the shield 12 , so that the contact hand 19 can be accommodated within the height range of the base portion 16 . Therefore, in this embodiment, after assembling the tunnel lining body 14 composed of the ring pieces 13 inside the rear part of the shield shell 12, as shown in FIG. Since the rotating roller contact portion 19c of the portion 19 is always in contact with the outer peripheral surface of the tunnel lining body 14 from the rear side of the shield shell 12, it is possible to easily detect the engagement and contact caused by the change in the clearance amount of the shield tail clearance 15. The change in the rotation angle of the rotating shaft portion 17 of the hand 19 makes it possible to easily continuously measure the change in the clearance amount of the shield tail clearance. Furthermore, when the advancing jack 35 is extended to advance the shield shell 12 relative to the tunnel lining body 14, as shown in FIG. 7(b), for example, before the advancing jack 35 is fully extended, the reversing mechanism 20a is preferably automatically By switching the air supply port from the A port to the B port, the rotary push mechanism 20 is controlled in conjunction with the extension state of the push jack 35 (see FIGS. 6( a ), ( b )). Thereby, before the part where the measuring device 10 is installed exceeds the front end of the assembled tunnel lining body 14 , the rotary push mechanism 20 releases the rotary push force, and rotates toward the opposite side of the central axis of the shield shell 12 with the contact hand 19 . The rotating shaft portion 17 is rotated in a moving manner, and the contact hand portion 19 can be accommodated in the height range of the base portion 16 . Furthermore, as shown in FIG. 7( c ), even when the push jack 35 is fully extended, the shield shell 12 is advanced relative to the tunnel lining body 14 so that the portion where the measuring device 10 is installed exceeds the distance between the assembled tunnel lining body 14 . The front end can also realize that the contact hand 19 does not protrude toward the central axis side of the shield shell 12 from the outer peripheral surface of the tunnel lining body 14, and does not become an obstacle when assembling the next tunnel lining body 14 by the ring piece 13, and can The length of the overlapped length of the assembled tunnel lining body 14 and the rear end portion of the shield shell 12 is effectively suppressed from increasing. Furthermore, during the operation of assembling the next tunnel lining body 14 using the ring piece 13, the detection of the rotation angle of the rotating shaft portion 17 is interrupted, and after the assembly of the next tunnel lining body 14 is completed, press the measurement preparation of the control device, for example. The completion button is pressed to switch the air supply port to port A, and as shown in FIG. 7( d ), the rotating roller contact portion 19 c that contacts the hand 19 is brought into contact with the outer peripheral surface of the tunnel lining body 14 from the rear side of the shield shell 12 , the detection of the rotation angle of the rotating shaft portion 17 is restarted, and the propulsion jack 35 is extended, and the drilling operation of the shield submersible machine 11 is restarted. In addition, this invention is not limited to the said embodiment, Various changes are possible. For example, the rotary push mechanism is not necessarily a rotary actuator such as a pneumatic rotary actuator, and various other known rotary push mechanisms including a reversing mechanism that releases the rotary push force to rotate the rotary shaft in the opposite direction may be used. In addition, the contacting hand does not necessarily have an arm shape having a rotating roller contacting portion at the front end of the main body, and other various contacting hands may be used.

[Industrial Availability]

According to the shield tail clearance measuring device or shield shell of the present invention, even if the shield shell advances relative to the tunnel lining body to the part where the measuring device is installed exceeds the front end of the assembled tunnel lining body, the hand will not touch the tunnel lining body more than the tunnel lining body. The outer peripheral surface protrudes toward the central axis side of the tunnel lining body, which will not hinder the assembly of the next tunnel lining body, and can effectively prevent the length of the assembled tunnel lining body and the rear end of the shield shell from becoming longer. .

10: Shield tail gap measurement device

11: Submersible shield machine

12: Shield Shell

13: Ring piece

14: Tunnel lining

15: Shield tail gap

16: Abutment part

16a: Chassis Department

16b: Bearing wall

16c: Spacer section

16d‧‧‧Bearing Mechanism 16e‧‧‧Through Hole 16f‧‧‧Bolt Fastening Fixing Hole 17‧‧‧Rotating Shaft Part 17a‧‧‧Central Expanded Diameter 17b‧‧‧End Reduced Diameter 17c‧‧ ‧Central enlarged diameter portion 17f‧‧‧End face engaging hole 18‧‧‧Rotation angle sensor 18a‧‧‧Sensor shaft 19‧‧‧contacting hand 19a‧‧‧arm body 19b‧‧‧engaging pin 19c‧‧‧Rotating roller contact portion 19d‧‧‧Notched surface 19e‧‧‧Rotating support shaft 20‧‧‧Rotating push mechanism 20a‧‧‧Reversing mechanism 20b‧‧‧Joining pin 20c‧‧‧Piping port 21‧ ‧‧Cover 21a‧‧‧Waterproof connector 22‧‧‧Sensor cable 23‧‧‧Installation recess 23a‧‧‧Steel plate 24‧‧‧Air supply piping 25‧‧‧Air ejection hole 26‧‧ ‧Air Supply Sleeve 27‧‧‧Groove 30‧‧‧Rotary Cutter 31‧‧‧Partition 32‧‧‧Soil Pressure Chamber 33‧‧‧Cutter Drive 34‧‧‧Soil Removal Mechanism 35‧‧‧ Push jack 36‧‧‧Installation device 40‧‧‧Main body 41‧‧‧Blade 42‧‧‧Rotating shaft 43‧‧‧Stopper 50‧‧‧Shield tail clearance measuring device 52‧‧‧Shield shell 51‧‧‧ Tunnel Lining 53‧‧‧Contact Hand A‧‧‧Part A‧‧‧Port B‧‧‧Port h1‧‧‧Height L1‧‧‧Length L2‧‧‧Length

FIG. 1 is a schematic cross-sectional view illustrating the structure of a submerged shield machine equipped with a shield tail clearance measuring device according to a preferred embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a main part of a shield casing to which a shield tail gap measuring device according to a preferred embodiment of the present invention is installed.

FIG. 3 is a schematic enlarged view of part A of FIG. 2 .

4 is a perspective view of a shield tail gap measuring device according to a preferred embodiment of the present invention. Figure 5(a) is a top view of the shield tail gap measuring device, and (b) is a cross-sectional view along B-B of (a). 6(a) and (b) are schematic cross-sectional views illustrating the reversing mechanism of the pneumatic rotary actuator. Fig. 7(a) is an explanatory view of a state in which the contact hand is pushed so as to rotate toward the central axis side of the shield shell and the rotation angle is detected, and (b) the contact hand is directed to the opposite side of the shield shell central axis An explanatory diagram of the height range of rotating and storing it in the base part, (c) is an explanatory diagram of the state of assembling the next ring piece, (d) is an explanatory diagram of the contact hand to rotate toward the central axis side of the shield shell An explanatory diagram of the state of pushing again and detecting the rotation angle in this way. Fig. 8 is an explanatory view of an air ejection mechanism for ejecting air from a portion of the base portion that is accommodated in contact with the hand. FIGS. 9( a ) to ( c ) are schematic cross-sectional views of main parts for explaining the malfunction of the conventional shield tail gap measuring device.

16‧‧‧Abutment

16a‧‧‧Chassis

16b‧‧‧Bearing wall

16c‧‧‧Spacer

16f‧‧‧Fixing holes for bolts

17‧‧‧Rotating shaft

17a‧‧‧Central part with enlarged diameter

19‧‧‧Touching hands

19a‧‧‧arm body

19c‧‧‧Rotating roller contact part

19d‧‧‧Notched surface

19e‧‧‧Rotation support shaft

20‧‧‧Rotary push mechanism

20c‧‧‧Piping port

21‧‧‧Cover

21a‧‧‧Waterproof Connector

22‧‧‧Sensor cable

26‧‧‧Air supply sleeve

h1‧‧‧Height

Claims (6)

A shield tail gap measuring device, which is used by being fixed to a mounting recess provided in a shield shell of a submersible shield machine, and is used to measure the tunnel lining held in the shield shell and a ring piece assembled at the rear of the shield shell. The gap measure of the shield tail gap between the outer peripheral surfaces of the body, and it is configured to include: a base part; a rotating shaft part provided in a state of being rotatably supported on the base part; a rotation angle sensor, It detects the rotation angle of the rotating shaft; a contacting hand is integrated with the rotating shaft and extends toward the rear side of the shield; and a rotating push mechanism makes the contacting hand face the shield The central axis side of the casing is rotated to impart a rotational thrust to the rotating shaft portion; and the base portion includes a chassis portion and a pair of bearing wall portions, and when being fixed in the mounting recess, is free from the shield casing. When viewed in the direction parallel to the central axis, it is formed to have a cross-sectional shape of ㄈ; the above-mentioned pair of bearing wall parts are spaced apart from the middle part and are erected and integrated from the two side parts of the above-mentioned chassis part, and are arranged with the above-mentioned shield. The central axis of the case is arranged to extend in parallel to support the rotating shaft portion; the rotating push mechanism has a reversing mechanism that releases the rotating push force to rotate the rotating shaft portion in the opposite direction, and makes the contacting hand The above-mentioned rotating shaft portion is rotated in a manner that the portion rotates to the opposite side of the central axis of the above-mentioned shield shell, so that the above-mentioned contact hand can be accommodated in the height range of the above-mentioned base portion; An air ejection mechanism for ejecting air from the upper surface of the chassis portion is provided in the space between the pair of bearing wall portions in the portion. The shield tail gap measuring device according to claim 1, wherein the rotary push mechanism is a rotary actuation device. The shield tail clearance measuring device according to claim 2, wherein the rotary push mechanism is a pneumatic rotary actuator. The shield tail gap measuring device according to claim 1, wherein the contact hand has an arm shape having a rotating roller contact portion at the front end of the arm body portion. A shield shell, which is installed with the shield tail gap measuring device as claimed in claim 1, and is provided with a rear end portion of a tunnel lining body composed of assembled ring pieces, and a mounting recess is formed on the inner peripheral surface, and the shield tail is attached. The gap measuring device is fixed to the mounting recess in a state in which the contact hand portion extends toward the axial rear side of the shield case, and the base portion does not protrude from the inner peripheral surface of the shield case. The shield case of claim 5, wherein the mounting recesses are provided at least at three locations at intervals in the circumferential direction of the rear portion, and the shield tail gap measuring device is fixed to each of the mounting recesses.

Images