JP6437895B2 - Backing prevention device - Google Patents

Description

  The present invention relates to a backing preventing device for preventing backing of a propelling pipe row when laying the propelling pipe row by a propulsion method.

  Conventionally, the propulsion method has been implemented to lay the propelling pipe row, but when the earth pressure and water pressure at the front face of the face are high, the propulsion pipe row is pushed back in the direction opposite to the excavation direction by those pressures. A phenomenon (backing) may occur. When such a backing occurs, various problems arise, such as a lack of space and the inability to install the next propulsion pipe.

Therefore, various structures have been proposed for such a device for preventing backing of the propelling pipe row (backing preventing device). Specifically,
A rod-shaped projecting rod is provided so as to penetrate the propulsion tube and project outward from the outer peripheral surface of the propulsion tube, and backing is prevented by using the projecting rod (for example, see Patent Document 1) Or
An annular body is fixed to the outer periphery of the propulsion pipe, and the annular body is used to prevent backing (for example, see Patent Document 2),
-The one that prevents backing by tightening the propulsion pipe with hydraulic pressure in the radial direction (for example, see Patent Document 3),
-A plurality of nuts are embedded in the propulsion pipe, and backing is prevented by using the nuts (see, for example, Patent Document 4)
Etc. have been proposed.

JP 2008-82068 A JP 2003-176688 A JP 2000-337085 A Japanese Patent Laid-Open No. 10-18767

  However, when processing such as drilling is performed on the propelling pipe, there is a problem that the work takes time and the work efficiency is lowered. Further, in order to prevent backing by tightening the propulsion pipe with the hydraulic pressure in the radial direction, it is necessary to take measures to prevent the propulsion pipe from cracking, and there is also a problem that work efficiency is lowered.

  An object of the present invention is to provide a backing prevention device that can solve the above-described problems.

The first aspect of the present invention is illustrated in FIGS. 1 (a) to 1 (c) and FIGS. 2 (a) to (c), and the ground (FIGS. 3 (a) and 3 (b)) is formed by a propulsion method. A plurality of propulsions while digging in a predetermined direction (refer to the reference numeral Df in the figure. The predetermined direction Df is referred to as “front direction” and the opposite direction Db is referred to as “rear direction”). Backing prevention device (1) for preventing backing, which is a phenomenon in which the propelling pipe row (AR) is pushed back (Db) by water pressure or earth pressure when laying the propelling pipe row (AR) composed of the pipe (A). , 11)
It corresponds to the rear end (Db) side end of the substantially cylindrical collar (C) fitted to the end of each propulsion pipe (A) (see reference numeral Ca, hereinafter referred to as “collar rear end”). It has a latching part (20, 120) configured to be able to come into contact, and the latching part (20, 120) is configured to be movable in a direction (F) close to the collar (C). Locking means (2, 12),
When the propelling pipe (A) is propelled to a predetermined position, the locking portion (20, 120) is arranged so that the locking portion (20, 120) can come into contact with the collar rear end portion (Ca). Locking part moving means (3, 13) for moving
When the locking portion (20, 120) is moved by the locking portion moving means (3, 13) and is brought into contact with the collar rear end (Ca), the locking means (2, 12) is The locking means (2, 12) is directly or indirectly through another member (refer to reference numerals 4A and 4B, hereinafter referred to as “interposition member”) so as not to move in the rearward direction (Db). Supporting means (see reference numeral 5 in FIGS. 3A and 3B) for supporting and preventing backing of the propelling pipe array (AR) is provided.

  According to a second aspect of the present invention, the locking means (2, 12) is disposed outside the collar (C), and the locking portion (20, 120) is formed from the outside of the collar (C). It is configured to be able to come into contact with the rear end (Ca).

  According to a third aspect of the present invention, there are a plurality of the locking means (2, 12), and a plurality of locations in the collar rear end portion (Ca), the axis (C0) of the collar (C). ), The plurality of locking portions (20, 120) are configured to be in contact with each other at a point that is substantially point-symmetric.

  According to a fourth aspect of the present invention, the support means (5) includes a structure (50) laid on the ground (G) and the structure (50) as illustrated in FIGS. ) And a support base (51) connected to the structure (50), and the structure (50) and the support base (51) are configured to receive the backing force.

According to a fifth aspect of the present invention, the locking part moving means (3) is a jack that moves the locking part (20) so as to be close to the collar (C) (hereinafter referred to as "locking part moving means"). Jack ”)
The locking means (2) can be moved directly or indirectly via the interposition members (4A, 4B) so as to be movable in the direction (F) close to the collar (C). It is attached to the moving means (3).

According to a sixth aspect of the present invention, as shown in FIG. 1A, the locking means (2) has an upper side and a lower side of the propulsion pipe (A) so as to sandwich the propulsion pipe (A). And are arranged respectively.
In the locking part moving jack (3), the locking means (2) on the upper side of the propulsion pipe (A) and the locking means (2) on the lower side of the propulsion pipe (A) can be separated from each other. To be directly or indirectly connected to the locking means (2) via the interposition members (4A, 4B),
The lower end of the locking portion moving jack (3) is connected to a starting stand (see reference numeral 7 in FIGS. 3A and 3B) directly or indirectly through another member. And

According to a seventh aspect of the present invention, the locking means (12) includes the locking portion (120) as illustrated in FIGS. 2 (a) to 2 (c) and FIGS. 3 (a) and 3 (b). It is attached to the support means (5) directly or indirectly via the interposition members (4A, 4B) in a state where it can move in the direction (F) close to the collar (C),
The locking part moving means (13) is disposed between the locking means (12) and the support means (5) or the interposition member (4A, 4B) and the locking part (120). It is an elastic member (13) which presses against the collar (C).

  According to an eighth aspect of the present invention, the locking means (12) is attached to the support means (5) or the interposition member (4A, 4B) via a hinge (14) so as to be swingable. It is characterized by that.

  According to a ninth aspect of the present invention, the elastic member (13) is a spring, a resin member, or a rubber member.

According to a tenth aspect of the present invention, the locking means (12) is disposed on the upper side and the lower side of the propulsion pipe (A) so as to sandwich the propulsion pipe (A), respectively.
The locking means (12) on the upper side of the propelling pipe (A) and the locking means (12) on the lower side of the propelling pipe (A) can be separated from each other. Is attached to the locking portion moving jack (3) directly or indirectly via the interposition member (4A, 4B),
The lower end of the locking portion moving jack (3) is characterized in that it is connected to the starting stand (7) directly or indirectly through another member.

  According to an eleventh aspect of the present invention, the locking means (12) can be moved directly or in the state in which the locking portion (120) is movable in a direction (F) close to the collar (C). In addition to being indirectly attached to the support means (5) via a mounting member (4A, 4B), it is also configured to function as the locking portion moving means by being formed of spring steel. And

  Note that the numbers in parentheses are for the sake of convenience indicating the corresponding elements in the drawings, and therefore the present description is not limited to the descriptions on the drawings.

  According to the above first, fourth, fifth, seventh to ninth and eleventh aspects, there is no need to perform processing for preventing backing (processing such as drilling holes or embedding bolts) on the side of the propulsion pipe. Therefore, work efficiency can be increased accordingly. In addition, since the propulsion tube is not hydraulically tightened in the radial direction, it is not necessary to take measures to prevent the propulsion tube from cracking, and the work efficiency can be increased accordingly.

  According to the second aspect described above, when the new propulsion pipe is inserted from the rear, it is possible to prevent the locking portion from interfering with the new propulsion pipe.

  According to the third aspect described above, when a backing force is applied to the propulsion pipe, the propulsion pipe can be prevented from being inclined with respect to the axis.

  According to the above sixth and tenth aspects, the propulsion pipe row can be prevented from being lifted, so that the device can be made more compact than when the backing prevention device and the lift prevention device must be provided separately. It can be used effectively even in narrow shafts or existing shield tunnels.

Fig.1 (a) is a front view which shows an example of a structure of the backing prevention apparatus which concerns on this invention, the figure (b) is the JJ end elevation, and the figure (c) is KK end face. FIG. FIG. 2 (a) is a front view showing another example of the configuration of the backing preventing apparatus according to the present invention, FIG. 2 (b) is an LL end view thereof, and FIG. It is M end elevation. 3A and 3B are side views showing an example of the configuration and use state of the backing prevention device according to the present invention. 4A and 4B are side views showing another example of the configuration and use state of the backing preventing apparatus according to the present invention. FIGS. 5A to 5E are cross-sectional views showing an example of the usage state of the backing preventing apparatus according to the present invention. 6 (a) to 6 (e) are cross-sectional views showing other examples of the usage state of the backing prevention device according to the present invention. FIG. 7 is a front view showing an example of the detailed structure of the attachment state of the locking means. FIG. 8 is a front view showing an example of a state in which the spacer member is arranged.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

The backing preventing apparatus according to the present invention is directed to the above-described backing (that is, the ground (see symbol G in FIGS. 3A and 3B) by a propulsion method) in a predetermined direction (see symbol Df in FIG. 3). The direction Df is “front direction” and the opposite direction Db is “rear direction”), and when the propulsion pipe array AR composed of a plurality of propulsion pipes A is laid, the propulsion pipe is caused by water pressure or earth pressure. This is a device for preventing the row AR from being pushed back in the backward direction Db, as illustrated by reference numerals 1 and 11 in FIGS. 1 (a) to 1 (c) and FIGS. 2 (a) to 2 (c). ,
The rear direction Db side of a substantially cylindrical metal (for example, steel or stainless steel) collar (so-called embedded collar or joint collar) C fitted to the end of each propulsion pipe A Means (hereinafter referred to as “locking means”) having locking portions 20 and 120 configured so as to be able to abut against the end portion (see reference numeral Ca; hereinafter referred to as “collar rear end portion”). ) 2,12
The locking portions 20 and 120 are close to the collar C so that the locking portions 20 and 120 can come into contact with the collar rear end Ca when the propelling tube A is propelled to a predetermined position. Locking part moving means 3, 13 for moving in the direction F;
When the locking portions 20 and 120 are moved in the direction F close to the collar C by the locking portion moving means 3 and 13 and come into contact with the collar rear end Ca, the locking means 2 and 2 The locking means 2 and 12 are indirectly supported via other members (hereinafter referred to as “interposition members”) 4A and 4B so that the 12 does not move in the backward direction Db. A supporting means for preventing backing (see reference numeral 5 in FIGS. 3A and 3B);
It has. The locking portions 20 and 120 are configured to be movable in a direction F close to the collar C. On the other hand, the above-described locking means 2 and 12 are disposed inside the collar C (that is, the side facing the inner peripheral surface of the collar C), and the locking portions 20 and 120 are disposed inside the collar C. Although not excluded from the scope of the present invention is a configuration that can be brought into contact with the collar rear end portion Ca, as illustrated in FIGS. 1 (b) (c) and 2 (b) (c). The locking means 2 and 12 are arranged on the outer side of the collar C (that is, the side facing the outer peripheral surface of the collar C), and the locking parts 20 and 120 are connected to the rear end of the collar from the outer side of the collar C. It is preferable to be able to contact the part Ca. In such a case, as illustrated in FIGS. 5C, 5D and 6C, 6D, when the new propelling pipe A is inserted from the rear, the locking portions 20, 120 are Interference with the new propulsion pipe A can be prevented. In that case, the locking portions 20 and 120 do not interfere with the propulsion pipe A when the propulsion pipe A is inserted, and further, do not interfere with the rubber ring SR attached to the end surface portion of the propulsion pipe A. The height may be set to such a height, and preferably chamfering is performed. Moreover, in the example shown to Fig.1 (a) and FIG.2 (a), although the said latching means 2 and 12 are indirectly supported by the said support means 5 via the said interposed members 4A and 4B, Of course, the present invention is not limited to this, and it may be directly supported by the support means 5 without using the interposing members 4A and 4B.

  By the way, as shown in FIGS. 3A and 3B, the support means 5 includes a structure 50 laid on the ground G and a support base (for example, a steel support construction) connected to the structure 50. ) 51, and the structure 50 and the support base 51 may be configured to receive the backing force. 3 (a) and 3 (b), the structure illustrated by reference numeral 50 is a bearing wall provided in the rear direction Db of the support base 51 inside the shaft E. Any structure can be used, and the support base 51 may be provided not in the rear direction Db but in the front direction Df. Further, as illustrated in FIGS. 4A and 4B, You may make it dig from. Further, the support base 51 may be anything as long as it can receive a force due to backing.

On the other hand, the locking part moving means described above is a jack (hereinafter referred to as “locking part movement”) that moves the locking part 20 so as to be close to the collar C as illustrated by reference numeral 3 in FIG. "Jack for use"). As a jack that can be used for the locking portion moving means,
・ Double-acting hydraulic jack (with two hydraulic hoses and hydraulically performing both pushing and pulling)
・ Screw jacks,
・ You can list giraffe jacks. Note that the locking means 2 illustrated in FIG. 1A is indirectly connected to the locking portion moving means via the interposed members 4A and 4B so as to be movable in the direction F close to the collar C. However, the present invention is not limited to this, and it may be directly attached to the engaging part moving means 3 without using the interposing members 4A and 4B.

  By the way, the one provided with only one of the locking means 2 and the locking portion 20 is not excluded from the scope of the present invention, but a plurality of the locking means 2 are arranged and the collar rear end portion is provided. It is preferable that a plurality of the locking portions 20,... Be in contact with a plurality of locations in Ca that are substantially point-symmetric with respect to the axis C0 of the collar C. In such a case, when a backing force is applied to the propulsion pipe A, the propulsion pipe A can be prevented from being inclined with respect to the axis C0. Here, as one mode in which the plurality of locking portions 20,... Are arranged at points that are substantially point-symmetric with respect to the axis C0 of the collar C, as illustrated in FIG. A plurality of the locking means 2 are arranged on the upper side of the propulsion pipe A and a plurality of the locking means 2 are arranged on the lower side of the propulsion pipe A (that is, on the upper side and the lower side of the propulsion pipe A, respectively). The locking means 2 are arranged in a line along each other), and the locking portions 20 of the respective locking means 2 are arranged at positions that are substantially point-symmetric with respect to the axis C0 of the collar C. Of course, it is not limited to this, and may be arranged in other places (that is, other than the upper and lower sides) or may be arranged in three or more places (three or more rows). good. Further, as illustrated in FIG. 1 (a), the locking means 2 is disposed on the upper side and the lower side of the propelling pipe A so as to sandwich the propelling pipe A, and the locking portion moving jack is provided. 3 is arranged directly or on the interposition member so that the locking means 2 on the upper side of the propulsion pipe A and the locking means 2 on the lower side of the propulsion pipe A can be separated from each other. In the case of being indirectly connected via 4A and 4B, the lower end of the locking portion moving jack 3 is directly or via another member (the interposition member or other member). It is preferable to be indirectly connected to the starting stand (see reference numeral 7 in FIGS. 3A and 3B). In such a case, as will be described later, it is possible to prevent the propelling tube array AR from being lifted.

  Further, when a plurality of the locking means 2,... Are attached as shown in FIG. 1A, as shown in detail in FIG. It is preferable to arrange gap members (bands) 8,... Between them so as to keep the spacing between the locking means 2 constant. Further, if the backing of the propelling tube array AR can be prevented, only one sheet (for example, the contact area between the collar rear end portion Ca and the locking portion 20 is not arranged in such a state that a plurality of sheets are arranged side by side). The locking means 2 may be arranged so as to be wider along the outer peripheral surface of the collar C). Further, in the example shown in FIGS. 1B and 1C, the locking means 2 is configured to be fitted into the recesses of the interposition members 4A and 4B and receive a backing force. It is not limited, and other structures may be used. For example, they may be connected by welding or bolts, or the locking means 2 and the interposition members 4A and 4B may be integrally formed.

  Next, an example of a method of using the backing prevention device 1 illustrated in FIGS. 1A to 1C will be described with reference to FIGS.

  When excavation for one propulsion pipe is completed by a shield machine (not shown) attached to the tip of the propulsion pipe array AR, the propulsion pipe array AR is moved by the propulsive force of the main push jack 6 applied through the push ring 16. Push out in the forward direction Df (see FIG. 5A). At this time, a spacer member (a timber, a rubber piece, a resin piece or the like) 9 is sandwiched between the upper locking means 2 and the propelling pipe A so that the pushed propelling pipe array AR does not float upward. And good. Next, when the spacer member 9 is removed and the locking portion moving jack 3 is driven, the locking means 2 is moved in the direction F close to the collar C, and the locking portion 20 is moved to the rear end of the collar. It abuts on the part Ca (see FIG. 5B). Even if the main push jack 6 is pulled back in this state, the backing of the propelling pipe array AR is prevented. Then, one propulsion pipe A is newly inserted into the space formed by pulling back the former push jack 6 (see FIGS. 3B and 5C). The newly inserted propulsion pipe A is pushed forward in the forward direction Df by the main push jack 6 and connected to the previously inserted propulsion pipe A (see FIG. 5D). Next, when the locking portion moving jack 3 is slightly extended and the spacer member 9 is sandwiched between the locking means 2 and the propelling pipe A on the upper side, the locking portion moving jack 3 is tightened. good. In such a case, the propulsion pipe row AR can be prevented from rising. In this way, it is possible to construct a pipeline by gradually lengthening the propelling tube array AR.

  On the other hand, the engaging part moving means described above may be structured as illustrated by reference numeral 13 in FIGS. That is, the locking means 12 is attached to the support means 5 indirectly via the interposing members 4A and 4B so that the locking portion 120 can move in the direction F close to the collar C. The locking part moving means 13 may be an elastic member that is disposed between the locking means 12 and the interposition members 4A and 4B and that presses the locking part 120 against the collar C. Further, the locking means 12 is directly attached to the support means 5 without the intervention members 4A and 4B as described above, and the locking portion moving means (elastic member) 13 is connected to the locking means 12. And the support means 5 may be arranged.

  By the way, the one provided with only one of the locking means 12 and the locking portion 120 is not excluded from the scope of the present invention, but a plurality of the locking means 12 are arranged and the collar rear end portion is provided. It is preferable that a plurality of the locking portions 120,... Be in contact with a plurality of locations in Ca that are substantially point-symmetric with respect to the axis C0 of the collar C. In such a case, when a backing force is applied to the propulsion pipe A, the propulsion pipe A can be prevented from being inclined with respect to the axis C0. Here, as one mode in which a plurality of the locking portions 120,... Are arranged at points substantially symmetrical with respect to the axis C0 of the collar C, as illustrated in FIG. A plurality of the locking means 12 are arranged on the upper side of the propulsion pipe A and a plurality of the locking means 12 are arranged on the lower side of the propulsion pipe A (that is, on the upper side and the lower side of the propulsion pipe A, respectively). The locking means 12 are arranged in a line along each other), and the locking portions 120 of the respective locking means 12 are arranged at positions that are substantially point-symmetric with respect to the axis C0 of the collar C. Of course, it is not limited to this, and may be arranged in other places (that is, other than the upper and lower sides) or may be arranged in three or more places (three or more rows). good. Further, as illustrated in FIG. 2A, the locking means 12 is disposed on the upper side and the lower side of the propelling pipe A so as to sandwich the propelling pipe A, and the locking portion moving jack is provided. 3 is arranged directly or on the interposition member so that the locking means 12 on the upper side of the propelling pipe A and the locking means 12 on the lower side of the propelling pipe A can be separated from each other. In the case of being indirectly connected via 4A and 4B, the lower end of the locking portion moving jack 3 is directly or via another member (the interposition member or other member). It is preferable to be indirectly connected to the starting stand (see reference numeral 7 in FIGS. 3A and 3B). In such a case, as will be described later, it is possible to prevent the propelling tube array AR from being lifted.

  2A, when a plurality of the locking means 12,... Are attached in a lined state, as shown in detail in FIG. It is preferable to arrange gap members (band irons) 8... Between them so as to keep the spacing of the locking means 12 constant. In such a case, the locking portion moving means (elastic member) 13 can be easily installed at an appropriate position, and the locking portion moving means (elastic member) 13 is laterally displaced from the appropriate position. (In other words, the shift in the left-right direction in FIG. 7) can be prevented. Further, if the backing of the propelling tube array AR can be prevented, only one sheet (for example, the contact area between the collar rear end portion Ca and the locking portion 120 is not arranged in such a state that a plurality of sheets are arranged side by side). The locking means 12 may be arranged so that the locking means 12 is curved along the outer peripheral surface of the collar C). Further, in the example shown in FIGS. 2 (b) and 2 (c), the locking means 12 is interposed between the interposing members 4A and 4B (or the support means 5) via a hinge 14 so as to be swingable. If the locking portion 120 is movable (swingable) in the direction F close to the collar C, a fixing method other than a hinge (for example, a fixing method by welding or the like) is used. May be. On the other hand, examples of the elastic member 13 include a spring, a resin member (for example, a plate member made of urethane), a rubber member, and the like.

  Next, an example of how to use the backing prevention device 11 illustrated in FIGS. 2A to 2C will be described with reference to FIGS.

  When excavation for one propulsion pipe is completed by a shield machine (not shown) attached to the tip of the propulsion pipe array AR, the propulsion pipe array AR is moved by the propulsive force of the main push jack 6 applied through the push ring 16. Extrusion in the forward direction Df (see FIG. 6A). At this time, the locking portion moving jack 3 is driven to bring the locking portion 120 into contact with the outer peripheral surface of the propelling pipe A (that is, the locking portion is moved by the elastic force of the elastic member 13). 120 is urged to the outer peripheral surface of the propelling pipe A), and the propelling pipe array AR to be pushed out is preferably prevented from floating upward. When the propulsion tube row AR is pushed out to a predetermined position by the main push jack 6, the locking portion 120 is moved by the elastic force of the elastic member 13 and engaged with the collar rear end portion Ca. (See (b) of the figure). Even if the main push jack 6 is pulled back in this state, the backing of the propelling pipe array AR is prevented. Then, one propulsion pipe A is newly inserted into the space formed by pulling back the former push jack 6 (see FIGS. 3B and 6C). The newly inserted propulsion pipe A is pushed in the forward direction Df by the main push jack 6 and is connected to the propulsion pipe A that has been previously inserted (see FIG. 6D). Further, when the propulsion pipe row AR is pushed forward by the main push jack 6, the engagement of the locking portion 120 with the collar rear end portion Ca is released, but the elasticity of the elastic member 13 is increased. The propulsion pipe A is pushed downward by force, and the propulsion pipe row AR can be prevented from being lifted. In this way, it is possible to construct a pipeline by gradually lengthening the propelling tube array AR. According to this method, unlike the method shown in FIG. 5, it is not necessary to finely control the locking portion moving jack 3, and it is not necessary to sandwich the spacer member 9, so that the excavation work is simplified. The

  On the other hand, the locking means 12 is directly or indirectly via the interposition members 4A and 4B in a state where the locking portion 120 can move in the direction F close to the collar C. And may be configured to function as the locking portion moving means by being formed of spring steel. In such a case, the elastic member 13 can be omitted.

  According to the present invention, there is no need to perform processing for preventing backing (processing such as drilling holes or embedding bolts) on the side of the propelling pipe A, and the work efficiency can be increased correspondingly. Further, since there is no method of hydraulically tightening the propulsion pipe A in the radial direction, it is not necessary to take measures to prevent the propulsion pipe from cracking, and the work efficiency can be improved accordingly. Furthermore, since the lifting prevention apparatus 1 and 11 according to the present invention can also prevent the propulsion pipe array AR from being lifted, the apparatus can be made more compact than when the backing prevention apparatus and the lifting prevention apparatus must be provided separately. It can be used effectively even in narrow shafts or existing shield tunnels.

DESCRIPTION OF SYMBOLS 1 Backing prevention apparatus 2 Locking means 3 Locking part moving means (locking part moving jack)
4A, 4B Intervening member 5 Support means 7 Starting stand 11 Backing prevention device 12 Locking means 13 Locking portion moving means (elastic member)
14 Hinge 20 Locking portion 50 Structure 51 laid on the ground 51 Support base 120 Locking portion A Propulsion tube AR Propulsion tube row C Color C0 Color axis Ca Color Rear end portion Db Backward direction Df Forward direction G Ground

Claims (11)

Propelling pipes composed of a plurality of propulsion pipes are laid while excavating the ground in a predetermined direction (hereinafter referred to as “front direction” and the opposite direction as “rear direction”) by the propulsion method. In the backing prevention device for preventing backing, which is a phenomenon in which the propelling pipe row is pushed back backward by water pressure or earth pressure,
A locking portion configured to be able to abut on a rear side end portion (hereinafter referred to as “collar rear end portion”) of a substantially cylindrical collar fitted to the end portion of each propulsion pipe. And a locking means configured such that the locking portion is movable in a direction close to the collar,
A locking portion moving means for moving the locking portion so that the locking portion can be brought into contact with the rear end portion of the collar when the propulsion pipe is propelled to a predetermined position;
When the locking portion is moved by the locking portion moving means and comes into contact with the rear end portion of the collar, the locking means is directly or otherwise prevented from moving backward. Support means for preventing backing of the propelling pipe row by supporting indirectly through a member (hereinafter referred to as “interposition member”);
An anti-backing device comprising: The locking means is disposed outside the collar, and the locking portion is configured to be able to abut on the collar rear end portion from the outside of the collar.
The backing preventing apparatus according to claim 1. A plurality of the locking means are arranged, and a plurality of the locking portions are brought into contact with a plurality of locations in the rear end portion of the collar, which are substantially point symmetrical with respect to the axis of the collar. Configured
The backing preventing apparatus according to claim 1 or 2, characterized by the above. The support means includes a structure laid on the ground and a support base coupled to the structure, and is configured to receive the force of the backing by the structure and the support base.
The backing preventing apparatus according to any one of claims 1 to 3, wherein the backing preventing apparatus is provided. The locking portion moving means is a jack that moves the locking portion so as to be close to the collar (hereinafter referred to as “locking portion moving jack”),
The locking means is attached to the locking part moving means directly or indirectly via the interposition member so as to be movable in a direction close to the collar.
The backing preventing apparatus according to any one of claims 1 to 4, wherein the backing preventing apparatus is provided. The locking means are respectively arranged on the upper side and the lower side of the propulsion pipe so as to sandwich the propulsion pipe,
The locking portion moving jack directly or above the locking means so that the locking means on the upper side of the propulsion pipe and the locking means on the lower side of the propulsion pipe can be separated from each other. Connected indirectly through the covering member,
The lower end of the locking portion moving jack is directly or indirectly connected to the starting frame via another member.
The backing preventing apparatus according to claim 5. The locking means is attached to the support means directly or indirectly via the interposition member in a state where the locking portion is movable in a direction close to the collar.
The locking part moving means is an elastic member that is disposed between the locking means and the support means or the interposition member and presses the locking part against the collar.
The backing preventing apparatus according to any one of claims 1 to 4, wherein the backing preventing apparatus is provided. The locking means is attached to the support means or the interposition member via a hinge so as to be swingable.
The backing preventing apparatus according to claim 7. The elastic member is a spring, a resin member, or a rubber member.
The backing preventing apparatus according to claim 7 or 8, characterized in that. The locking means are respectively arranged on the upper side and the lower side of the propulsion pipe so as to sandwich the propulsion pipe,
The locking means on the upper side of the propulsion pipe and the locking means on the lower side of the propulsion pipe can be separated from each other directly or indirectly via the interposition member. The locking part moving jack is attached,
The lower end of the locking portion moving jack is directly or indirectly connected to the starting frame via another member.
The backing preventing apparatus according to claim 7, wherein the backing preventing apparatus is provided. The locking means is attached to the support means directly or indirectly via the interposition member in a state where the locking portion is movable in a direction close to the collar, and is formed of spring steel. Configured to function as the locking portion moving means.
The backing preventing apparatus according to any one of claims 1 to 4, wherein the backing preventing apparatus is provided.

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