JP4649665B2 - Folding parent and child shield - Google Patents

Description

  The present invention relates to a middle folding type parent-child shield provided with a middle folding mechanism.

  As the folding type parent-child shield, those described in Patent Documents 1 and 2 are known. In these middle-foldable parent-child shields, the front and rear torso of the parent shield are flexibly connected by a middle folding mechanism, and the front and rear torso of the child shield are flexibly connected by another middle folding mechanism. ing.

  By the way, the middle folding mechanism not only connects the front cylinder and the rear cylinder so that they can be bent, but also stops water against the earth pressure between the front cylinder and the rear cylinder, so that it is manufactured with high accuracy. There is a need. For this reason, the middle folding mechanism is expensive, and there is a problem that the middle folding type parent-child shield provided with the middle folding mechanism is also expensive.

  Therefore, the present inventors are currently developing (unpublished) a middle-folding parent-child shield that uses a middle-folding mechanism as a parent-child common to solve such a problem. As shown in FIG. 8, this folding parent-child shield 50 is provided with a small-diameter front body 52 that can start in a large-diameter front body 51 and extends rearward in the start-up direction. A rear cylinder 54 having a small diameter is provided in the rear cylinder 53 so as to be able to start, and the front cylinder 52 and the rear cylinder 54 having a small diameter are connected to each other through a middle folding mechanism 55 so as to be freely folded. The propulsion jack 56 is provided so as to extend forward so as to surround the outer periphery of the small-diameter front barrel 52. According to this, the expensive folding mechanism 55 can be reduced to one, and the folding parent-child shield 50 can be provided at low cost.

Japanese Patent No. 3605877 Japanese Patent No. 2647356 Japanese Examined Patent Publication No. 2-51038 JP 2001-349171 A

  However, since the propulsion jack 56 is extended from the rear barrel 53 side to the outer periphery of the small-diameter front barrel 52, the propulsion jack 56 to the propulsion jack 56 are accommodated when the middle folding mechanism 55 is bent and turned. The extension part 57 of the trunk | drum 53 interferes with the front trunk | drum 52 of a small diameter, and there existed a subject that it cannot make a quick turn.

  Accordingly, an object of the present invention is to solve the above-described problems, and to provide a middle-folding type parent-child shield that can make a middle-folding mechanism common to a parent and child and can turn rapidly.

In order to solve the above-mentioned problems, the present invention provides a small-diameter front cylinder that can start in a large-diameter front cylinder and extends backward in the starting direction, while a small-diameter in the large-diameter rear cylinder. the rear body provided to be starting, linked to freely folded medium through the center bending mechanism and a front cylinder and a rear cylinder of small diameter, a propulsion jack cylinder after the large diameter, the center bending mechanism and the small-diameter a foldable child shield within which is provided extending forwardly so as to surround the outer periphery of the front torso of one of the traction jack, Ri jack Tona at least a part of the propulsion jacks are telescopic to a plurality of stages, the large The front cylinder and the rear cylinder of the caliber are arranged apart from each other in the front and rear, the middle folding mechanism is shared by the parent and child, the rear cylinder of the large caliber extends forward to accommodate the propulsion jack, Surround the outer circumference of the center folding mechanism and the small-diameter front cylinder with a gap in the radial direction. The one in which the extending portion of the shape obtained by extending forwardly front outer peripheral portion of the body after the large diameter is formed.

In addition, a small-diameter front cylinder can be started in the large-diameter front cylinder and provided to extend rearward in the starting direction, while a small-diameter rear cylinder is provided in the large-diameter rear cylinder so that it can start. A small-diameter front torso and a rear torso are connected via a folding mechanism so that they can be folded freely. A foldable parent-child shield extending forward, and among the above-mentioned propulsion jacks, some propulsion jacks consist of jacks that expand and contract in a plurality of stages and forward so as to accept axially inserted key segments provided by shifting the position, the other propulsion jack, with consists jack to stretch in a single stage is provided located in amount corresponding rearward acceptance allowance of the key segments from the jack to stretch to the plurality of stages, the large-diameter The front and rear torso The middle folding mechanism is shared by the parent and child, and the rear trunk of the large bore extends forward to accommodate the propulsion jack, and the front of the middle folding mechanism and the small bore. An extension portion having a shape in which the outer peripheral portion of the front end of the rear cylinder having the large diameter is extended forward so as to surround the outer periphery of the cylinder with a gap in the radial direction .

It is preferable that the outer periphery of the front end of the extending portion be formed to have a smaller diameter than the large-diameter front body .

  According to the present invention, the folding mechanism can be shared by the parent and child and can be turned rapidly.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1 and FIG. 2, the folding parent-child shield 1 includes a large-diameter main unit-side front torso 3 constituting the main shield 2, and can start in the main unit-side front torso 3. A small-diameter handset-side front torso 5 that extends backward in the direction and constitutes the child shield 4, a large-diameter parent-side rear torso 6 that constitutes the parent shield 2, and a parent machine-side rear torso 6 There is provided a small-diameter handset-side rear trunk 7 which is provided so as to be able to start and constitutes the slave shield 4, and a middle-folding mechanism 8 which connects the handset-side front trunk 5 and the handset-side rear trunk 7 so as to be freely foldable. It is configured.

  The main unit side front cylinder 3 includes an inner cylinder part 9 through which the child machine side front cylinder 5 is inserted, an outer cylinder part 10 coaxially arranged on the outer peripheral side of the inner cylinder part 9, and an inner cylinder part 9 and an outer cylinder. The ring plate-like frame member 11 is provided at both ends of the portion 10 and closes the gap therebetween.

  The slave unit side front barrel 5 includes a cylindrical shield frame 12 which is formed longer in the axial direction than the master unit side front barrel 3 and a partition wall 13 which closes the front end of the shield frame 12. The shield frame 12 is detachably fixed to the inner cylinder portion 9 of the base unit side front case 3 via the front case fixing device 14. Specifically, the front trunk fixing device 14 is screwed into the first nut 15 provided in the shield frame 12, the second nut 16 provided in the inner cylinder portion 9, and the first nut 15 and the second nut 16. And a bolt 17 to be configured. In addition, the child machine side front barrel 5 is provided with a child machine side cutter 18 for excavating the earth and sand ahead of the child machine side so as to be rotatable or swingable. The handset-side cutter 18 is formed to have a slightly larger diameter than the handset-side front barrel 5. The slave-side cutter 18 is provided with a ring-shaped master-side cutter 19 for excavating the front of the master-side front barrel 3 so as to be removable. Further, the bulkhead 13 is provided with a soil removal device 20 common to the parent and child, and takes in the earth and sand in the cutter chamber 21 formed between the master side cutter 19 and the slave side cutter 18 and the partition wall 13 to the rear. To be discharged.

  The handset-side rear trunk 7 is formed to have substantially the same diameter as the handset-side front trunk 5 and is divided into front and rear, and when digging together with the parent shield 2, only the front portion 22 is the front-side trunk on the handset side. 5 is connected via a middle folding mechanism 8 to the rear end. As a result, a space for installing the erector 23 is formed in the base unit side rear cylinder 6 described later, and the assembly work of the segments 31 and 36 can be performed. The rear part (not shown) of the child machine side rear trunk 7 is attached to the front part 22 of the child machine side rear trunk 7 when the erector 23 of the parent shield 2 is disassembled and the child shield 4 is started from the parent shield 2. It is like that.

  The master unit side rear cylinder 6 is formed to have a substantially same diameter as the master unit side front cylinder 3 and to insert the slave unit side rear cylinder 7, and is provided to extend forward to the rear cylinder body unit 24. And an extension portion 27 that accommodates the propulsion jacks 25 and 26, and is disposed behind the base unit-side front barrel 3.

  The extending part 27 is formed in a shape in which the outer peripheral part of the front end of the rear trunk body part 24 extends forward, and surrounds the outer periphery of the center folding mechanism 8 and the child machine side front trunk 5 with an interval therebetween. It has become. In addition, an attachment frame 28 for attaching the propulsion jacks 25 and 26 is provided in an annular shape at the rear end of the extending portion 27. The propulsion jacks 25 and 26 attached to the attachment frame 28 are respectively arranged such that the cylinder portions 25a and 26a are accommodated in the extension portion 27 and the rod portions 25b and 26b are extended rearward and retractably, and the rod portion 25b. , 26b, the existing segment 30 is pushed backward by a jack shoe 29 provided at the rear end.

  As shown in FIGS. 1 and 3, among the plurality of propulsion jacks 25, 26, some of the propulsion jacks 25 include a telescopic multistage jack 25 that expands and contracts in two or more stages, and other propulsion jacks 26. Consists of a single-stage jack 26 that expands and contracts in a single stage. The multi-stage jack 25 is used to suppress the length of extension to the front, and from the existing segment 30 so as to receive the axial insertion type key segment 31 shown in FIG. They are spaced apart. Here, the axial insertion type key segment 31 is the last segment to be assembled when the segment is assembled in a ring shape, and is formed by inclining the end in the circumferential direction so that the circumferential length becomes shorter toward the rear. ing. For this reason, the key segment 31 needs to be sufficiently spaced forward from the existing segment 30 when inserted between the propulsion jack 25 and the existing segment 30. For this reason, the propulsion jack 26 that receives the key segment 31 has to be separated from the existing segment 30. It is necessary to provide it away from the front 30. The single-stage jack 26 is employed on the assumption that the key segment 31 is not received, and is positioned rearward from the multi-stage jack 25 by an amount corresponding to the reception amount of the key segment 31. As a result, the head position (front end position) of the single-stage jack 26 can be brought closer to the existing segment 30 than the position where the key segment 31 is received, and the stroke of the single-stage jack 26 can be divided by the amount of receipt of the key segment 31. The length of the single-stage jack 26 extending forward from the rear trunk body 24 can be reduced synergistically.

  Further, the extending part 27 is detachably fixed to the slave unit side rear cylinder 7 via a rear cylinder fixing device 32. The rear cylinder fixing device 32 is the same as the front cylinder fixing device 14, and includes nuts 15 and 16 provided on the respective rear cylinders 6 and 7, and bolts 17 screwed to the nuts 15 and 16. The extending portion 27 is formed so as to squeeze the outer periphery of the front end radially inward, so that the front end on the outer peripheral side does not protrude toward the natural ground when turning excavation. In addition, a bellows-like cover 33 is provided between the outer periphery of the extension portion 27 and the outer periphery of the base unit side front barrel 3 so that earth and sand do not enter the inner periphery side of the extension portion 27. .

  The middle folding mechanism 8 includes a spherical bearing 34. On the radially inner side of the spherical bearing 34, a plurality of bent jacks 35 that connect the child machine side front case 5 and the child machine side rear case 7 are arranged along the circumferential direction. The child machine side front cylinder 5 is bent with respect to the rear cylinder 7.

  Next, the operation of this embodiment will be described.

  As shown in FIGS. 1 and 2, when the folding parent-child shield 1 is dug, some of the propulsion jacks 25 and 26 are retracted while the propulsion jacks 25 and 26 are extended to take a reaction force from the existing segment 30. And digging while assembling the segments 31 and 36 to the existing segment 30 at the position of the propulsion jacks 25 and 26.

  When the propulsion jacks 25 and 26 to be retracted are single-stage jacks 26, the normal segment 36 is assembled to the existing segment 30. At this time, the single-stage jack 26 is positioned rearward without the allowance for receiving the key segment 31, and therefore has a shorter stroke than a normal propulsion jack that provides the allowance for receiving the key segment 31. For this reason, it is possible to shorten the time required for the operation of fully retracting to receive the normal segment 36 and the time required for the operation of bringing the jack shoe 29 into contact with the assembled existing segment 30 and increase the excavation speed. .

  When the propulsion jacks 25 and 26 to be retracted are the multistage jacks 25, the key segment 31 or the normal segment 36 is assembled to the existing segment 30. When assembling the key segment 31, as shown in FIG. 6 (a), the multi-stage jack 25 is retracted to form a space for receiving the key segment 31 between the multi-stage jack 25 and the existing segment 30, and FIG. As shown in FIG. 6B, the key segment 31 is inserted into this space by moving the gripping portion 37 of the erector 23 in the radial direction, and as shown in FIG. , The rear end surface of the key segment 31 is butted against the front end surface of the existing segment 30, and the key segment 31 is attached to the existing segment 30 with a bolt (not shown). After assembling the key segment 31 in this way, as shown in FIG. 6D, the multistage jack 25 is extended, and the jack shoe 29 is brought into contact with the existing segment 30 as in the case of the normal segment 36. At this time, since it differs from the conventional middle folding type parent-child shield (not shown) in that there is no middle folding mechanism on the outer peripheral side of the propulsion jack, the radial eccentricity of the multi-stage jack 25 and the existing segment 30 is changed to the conventional amount. It is possible to reduce the number of the intermediate folding type parent-child shield, and the multi-stage jack 25 and the jack shoe 29 can be arranged substantially coaxially. For this reason, it is possible to stably use the multistage jack 25 in which it is generally difficult to obtain the strength against the eccentricity. After the jack shoe 29 is brought into contact with the existing segment 30, the reaction force can be obtained from the existing segment 30 by further extending the multistage jack 25 as shown in FIG.

  As shown in FIG.1 and FIG.5, when carrying out curve construction with the folding parent-child shield 1, the respective propulsion jacks 25 and 26 are controlled so that the propulsive force on the outer periphery side of the curve is larger than that on the inner periphery side, Each of the bent jacks 35 on the outer periphery side of the curve is extended. Thereby, the front cylinders 3 and 5 and the rear cylinders 6 and 7 are bent around the inner peripheral side of the curve of the middle folding mechanism 8, and the digging direction of the parent-child shield 1 can be bent. At this time, although the outer side of the slave unit side front barrel 5 is surrounded by the extending portion 27 of the master unit side rear barrel 6, the multistage jack 25 for receiving the key segment 31 is from a conventional single stage jack (not shown). The single-stage jack 26 that does not accept the key segment 31 is also positioned rearward of the conventional single-stage jack and the stroke is shortened by the amount that the key segment 31 is not received. Since the axial length of the cylinder portion 26a is formed short, the length of the extending portion 27 in the axial direction can be made sufficiently short. For this reason, it can prevent that the subunit | mobile_unit side front cylinder 5 and the extension part 27 interfere with each other at the time of a middle break, and the front cylinders 3 and 5 can be bent enough angle with respect to the rear cylinders 6 and 7. The parent-child shield 1 can be turned rapidly.

  Thus, among the propulsion jacks 25 and 26, some propulsion jacks 25 are composed of telescopic multi-stage jacks 25 that expand and contract in a plurality of stages in order to suppress the forward extension length, and are axially inserted type keys. The other propulsion jack 26 includes a single-stage jack 26 that expands and contracts in a single stage and is positioned behind the multi-stage jack 25 by an amount corresponding to the receiving allowance for the key segment 31. Therefore, the forward extension length of the propulsion jacks 25 and 26 arranged on the outer peripheral side of the child machine side front trunk 5 can be kept short, and the middle folding mechanism 8 is shared by the parent and child. Even the middle folding parent-child shield 1 can be turned sharply. Moreover, since the multistage jack 25 is generally more expensive than the single stage jack 26, an increase in manufacturing cost can be suppressed by limiting the use location of the multistage jack 25.

  In addition, since the base unit side rear trunk 6 is formed with an extending portion 27 extending forward to accommodate the propulsion jacks 25 and 26, the propulsion jacks 25 and 26 can be protected from the surrounding earth and sand. In addition, the propulsion jacks 25 and 26 can be easily collected.

  In addition, although the multistage jack 25 shall be arrange | positioned at the upper part of the main | base station side rear trunk | drum 6, it does not restrict to this and may be arrange | positioned in any position. In this case, the key segment 31 may be assembled at the position where the multistage jack 25 is disposed.

  In addition, when the direction in which it is not necessary to make a sudden turn is known in advance, the propulsion jack 56 (see FIG. 8) of the above-described old development machine may be used as it is for the propulsion jack located inside the turning direction. The key segment 31 can be received between the propulsion jack 56 and the existing segment 30 as in the prior art.

  Another embodiment will be described.

  7 is a modification of the propulsion jacks 25 and 26 and the extension 27 of the above-described center-foldable parent-child shield 1. The description of the same configuration as that described above is omitted, and the same reference numerals are given.

  The propulsion jacks 25 are all composed of the above-described multistage jacks 25, and the positions in the front-rear direction are all the same as the above-described multistage jacks 25. The extending portion 41 has a length that matches the length of the forward extension of the multistage jack 25.

  As described above, even when the propulsion jack 25 includes the telescopic multi-stage jack 25 that expands and contracts in a plurality of stages so as to suppress the extension length to the front, the propulsion jack 25 can be turned rapidly as in the above-described embodiment. . Further, it is easier to shorten the axial length than the single-stage jack 26, and the axial length of the extending portion 41 can be further shortened than the above-described middle folding type parent-child shield 1, and the middle folding type parent-child shield. 40 can be turned more rapidly.

It is side surface sectional drawing of the folding type parent-child shield which shows suitable embodiment of this invention. FIG. 2 is a plan sectional view of FIG. 1. It is AA arrow sectional drawing of FIG. It is a schematic explanatory drawing of the axial direction insertion type key segment. It is a plane sectional view of the middle folding type child shield at the time of curve construction. It is explanatory drawing explaining the assembly procedure of a key segment, (a) shows the state which degenerated the multistage jack, (b) shows the state which inserted the segment between the multistage jack and the existing segment, (c) Shows the state where the segment is attached to the existing segment, (d) shows the state where the jack shoe is in contact with the existing segment, and (e) shows the propulsion reaction force from the existing segment by extending the multistage jack. Indicates the state. It is a plane sectional view of the middle folding type parent and child shield at the time of curve construction showing other embodiments. It is a plane sectional view of an old type folding parent-child shield (unreleased) developed by the present invention.

Explanation of symbols

1 Folding-type parent-child shield 3 Master-side front trunk 5 Slave-side front trunk 6 Master-side rear trunk 7 Slave-side rear trunk 25 Multistage jack (propulsion jack)
26 Single-stage jack (propulsion jack)
27 Extending part 31 Key segment 40 Folding-type parent-child shield 41 Extending part

Claims (3)

A small-diameter front cylinder can be started in the large-diameter front cylinder and provided to extend rearward in the starting direction, while a small-diameter rear cylinder is provided in the large-diameter rear cylinder so that it can start. the front body coupled freely folded medium through the center bending mechanism and a rear cylinder and the propulsion jack cylinder after the large-diameter forward so as to surround the outer periphery of the front torso of the mechanism and the small-diameter bending in the a foldable child shield within which is provided extending out of said propulsion jacks, Ri jack Tona at least a part of the propulsion jacks are telescopic to a plurality of stages, and the front cylinder and the rear body of the large-diameter before and after The middle folding mechanism is shared by the parent and child, and the large-diameter rear trunk extends forward to accommodate the propulsion jack, and the middle-folding mechanism and the small-diameter front trunk The outer peripheral portion of the front end of the rear barrel of the large diameter so as to surround the outer periphery of the Among foldable child shield, characterized in that the extending portion of the shape obtained by extending is formed towards. A small-diameter front cylinder can be started in the large-diameter front cylinder and provided to extend rearward in the starting direction, while a small-diameter rear cylinder is provided in the large-diameter rear cylinder so that it can start. The front torso and the rear torso are connected to each other via a center folding mechanism so that they can be folded. A middle-folding type parent-child shield that extends and includes a portion of the above-mentioned propulsion jacks that are made of jacks that expand and contract in multiple stages and that are positioned forward so as to accept axially inserted key segments. The other propulsion jack is provided with a shift and is provided with a jack that extends and retracts in a plurality of stages and is positioned rearward from the jack that expands and contracts in a plurality of stages, and is provided in front of the large diameter. The torso and back torso are separated The middle-folding mechanism is shared by the parent and child, and the large-diameter rear trunk extends forward to accommodate the propulsion jack, and the middle-folding mechanism and the small-diameter front trunk An intermediate-fold type parent-child shield characterized in that an extending portion having a shape in which a front end outer peripheral portion of the rear barrel of the large diameter is extended forward is formed so as to surround the outer periphery with a gap in the radial direction . The middle-folding parent-child shield according to claim 1 or 2 , wherein the outer periphery of the front end of the extending portion is formed to have a smaller diameter than a large-diameter front trunk .

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