JP2017150247A - Working face collapse prevention device in propulsion method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working face collapse prevention device in a propulsion method, excellent in workability with a simple constitution, and capable of also surely preventing a collapse of a working face.SOLUTION: A working face collapse prevention device comprises a pair of metallic door bodies 7 provided in a position for separating a clearance from a working face on the inside of a blade port body 2, connected via an opening-closing hinge 9 to the blade port body so as to be opened-closed by double-swinging, communicating the working face side and the propulsion pipe side by being opened and constituting a partition wall 10 for partitioning the working face side from the propulsion pipe side by being blocked up, main closing means 11 for holding the pair of door bodies in a closed state and a synthetic resin packing object detachably loaded in the clearance and covering the whole partition wall to the working face, and the packing object is composed of a plurality of packing object blocks, and the packing object blocks constitute the packing object by being packed in the clearance, and the door bodies comprise a plurality of door pieces 7a, 7b and 7c and a folding-up hinge 12 for bendably-expandably connecting the mutual door pieces, and the door pieces are held in an expansion state via sub-closing means 13.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a face falling prevention device in a propulsion method that has a simple structure, good workability, and can reliably prevent the face from falling.

  While excavating the face in front of the cutting edge body through an annular cutting edge structure that is open to the natural ground, push the propulsion pipe with the propulsion jack provided in the start shaft, and accordingly the blade Patent Documents 1 and 2 are known as techniques for preventing the face from collapsing toward the propelling pipe through the inside of the blade mouth body when the excavation work is suspended in the propulsion method for moving the mouth body toward the face. Yes.

  The “blade closing device” disclosed in Patent Document 1 is intended to facilitate the closing of the blade tip conductor of the propulsion method, and a wooden sheet pile for closing the blade is assembled in the blade tip conductor. A synthetic rubber tube is provided on the back side with respect to the face of the sheet pile so as to be inscribed in the inner peripheral surface of the blade tip conductor to support the wooden sheet pile.

  The “expanded bag body” of Patent Document 2 includes a first steel plate that closes the opening of the bag portion from the outside, and a second steel plate that is disposed inside the bag portion along the bag mouth. And inflated bag to form an inflatable bag. The bag portion has a double structure in which an ultra-high strength polyethylene fiber bag formed in a bag shape covers the outside of a polyurethane bag formed in a bag shape. The first steel plate is provided with an air inflow / outflow portion including an air inflow / outflow tube inside the bag portion and an air amount adjusting valve. For example, the expansion bag body is disposed on the face side of the door provided in the face side opening of the open type tunnel excavator so as to press the face in an inflated state filled with air so as to prevent the face from collapsing. It has become.

Japanese Patent Laid-Open No. 9-268883 JP 2010-150876 A

  In any of the background arts, a tube or a bag is provided, and the tube or the like is inflated with air pressure to prevent the face from collapsing. A tube or the like that swells with air pressure acts as a cushion and may be deformed by falling sand or the like, and it is difficult to reliably prevent the face from collapsing.

  Further, it took a considerable time to properly inflate the tube and the like, and the workability was not good. Furthermore, in Patent Document 1, it is necessary to provide a sheet pile, a support frame, or the like in order to support the tube, or to provide a facility for sending air into the tube, and the configuration is large. Similarly, in Patent Document 2, it is necessary to provide a structure for assembling the inflatable bag body to the door, or to provide a facility for sending air into the inflatable bag body, which requires a significant improvement.

  The present invention was devised in view of the above-described conventional problems, and has a simple structure, good workability, and a face falling prevention device in a propulsion method capable of reliably preventing face falling. The purpose is to provide.

  The face collapse prevention device in the propulsion method according to the present invention is a face fall prevention device in the propulsion method for preventing the face from collapsing toward the propelling pipe through the inside of the annular blade edge body. Is provided at a position separating the gap from the face, and is connected to the blade mouth body via an opening / closing hinge so as to be opened and closed by double opening, and is opened and communicated between the face side and the propelling pipe side and is closed. A pair of metal door bodies constituting a partition wall that partitions the face side from the propelling tube side, main closing means for holding the pair of door bodies in a closed state, and detachably loaded in the gap, the above described against the face A pad made of a synthetic resin covering the entire partition wall, the padding comprising a plurality of padding blocks, the padding block being packed into the gap to form a padding, and the door body having a plurality of door pieces And the door And a hinge for folding connecting the over scan each other freely flexion and extension, the door piece, characterized in that it is held in the extended state via a sub-closure means.

  A pair of said door bodies are a left-right pair so that it may be opened and closed by opening both right and left.

  One of the stuffing blocks is arranged across the pair of door bodies in the left-right direction of the pair of door bodies.

  The padding is pressed against the face by the partition wall.

  The face collapse prevention device in the propulsion method according to the present invention has a simple structure, good workability, and can reliably prevent the face fall.

1 is a partially cutaway side view of a blade body showing a preferred embodiment of a face collapse prevention device in a propulsion method according to the present invention. FIG. 2 is a front view of the blade body shown in FIG. 1 as viewed from the propelling tube side in the closed state. It is a perspective view which shows the state which removed the auxiliary | assistant closing means shown by FIG. 2, and made the door piece bendable. It is a perspective view which shows the state which bent the door piece shown by FIG. 2, and also removed the main closing means, and enabled the door body to open | release. It is a perspective view which shows the state which open | released the door body shown by FIG. It is the front view which looked at the arrangement | positioning state of the several stuffing piece which comprises the stuffing shown in FIG. 1 from the propulsion pipe side. It is explanatory drawing explaining an example of the method of installation of a stuffing piece. It is a figure corresponding to FIG. 2 which shows the modification of the door body provided in the face collapse prevention apparatus in the propulsion method concerning this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a face collapse prevention device in a propulsion method according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a partially broken side view of a blade body provided with a device for preventing face collapse in the propulsion method according to the present embodiment, and FIG. 2 is the blade body shown in FIG. FIG. 3 is a front view seen from the pipe side, FIG. 3 is a perspective view showing a state in which the sub-closing means shown in FIG. 2 is removed and the door piece can be bent, and FIG. 4 is shown in FIG. The perspective view which shows the state which bent the door piece, and also removed the main closing means, and made the door body openable, FIG. 5 is the perspective view which shows the state which opened the door body shown by FIG. 6 is a front view of a plurality of padding pieces constituting the padding shown in FIG. 1 as viewed from the propelling tube side, and FIG. 7 is an explanatory view for explaining an example of how the padding pieces are installed.

  The propulsion method is well known in the art, and as shown in FIG. 1, the cutting face 3 in front of the blade body 2 is excavated through an annular blade body 2 having a structure opened toward the natural ground 1. Thus, the propulsion pipe 4 is propelled and pushed by the propulsion jack provided in the start shaft, and the blade edge body 2 is propelled toward the face 3 accordingly.

  The blade body 2 includes an annular blade portion 5 on the front side in the propulsion direction facing the face 3 and an annular main body portion 6 on the rear side in the propulsion direction that is pressed against the propulsion pipe 4 continuously provided on the start shaft side. Consists of The body portion 6 and the blade portion 5 are integrated to form the blade body 2.

  An annular blade body 2 is provided with a pair of metal doors 7 such as steel doors that are opened and closed by double opening. These door bodies 7 are provided inside the main body 6 behind the blade portion 5 in the propulsion direction, so that the door body 7 is provided at a position separating the gap S from the face 3 by at least the dimension of the blade portion 5 in the propulsion direction.

  As shown in FIGS. 2 to 5, the annular main body 6 divides a circular inner space inside thereof, and a pair of door bodies 7 are provided to close the inner space. In the present embodiment, the pair of door bodies 7 is a pair of left and right so as to be opened / closed by opening both left and right. Specifically, the main body 6 is integrally provided with a pair of left and right mounting portions 8 that protrude from the left and right lateral portions to the inner space, and an opening / closing hinge 9 provided on each of the mounting portions 8 is provided. The pair of left and right door bodies 7 are connected to the main body portion 6.

  In the illustrated example, the pair of left and right door bodies 7 are configured to be opened and closed to the left and right with the center in the horizontal direction of the circular inner space as a boundary, and are formed with the same external dimensions, but the external dimensions are different. It may be configured to be opened and closed with a position different from the center as a boundary.

  The pair of door bodies 7 are opened via an opening / closing hinge 9 so that the face 3 on the front side in the propulsion direction of the blade body 2 communicates with the propulsion pipe 4 side on the rear side in the propulsion direction. By being closed, a partition wall 10 is formed that partitions the face 3 side from the propelling tube 4 side.

  A main closing means 11 for holding the pair of door bodies 7 in a closed state is provided. The main closing means 11 is located on the propelling pipe 4 side, and a pair of receiving grooves provided so as to protrude from each of the pair of attachment portions 8 of the main body 6 or each door surface of the pair of door bodies 7. It is comprised from the member 11a and the rod-shaped main rod member 11b passed between these receiving groove members 11a. The pair of receiving groove members 11a are formed in an L shape so that the main rod member 11b can be dropped from above and the main rod member 11b can be disposed in the lateral direction.

  The receiving groove member 11a may be provided on either the door surface of the door body 7 or the mounting portion 8. However, in the illustrated example, it is more effective for the pair of door bodies 7 to be opened. In order to ensure the closing action, it is preferable that a support reaction force is obtained from the blade edge body 2, and therefore the receiving groove member 11 a is provided in the attachment portion 8 provided integrally with the blade edge body 2. In addition, the main rod member 11b is configured so as to be passed between the pair of attachment portions 8.

  Each door body 7 is composed of a plurality of door pieces 7a, 7b, 7c in a form obtained by dividing the door body into a plurality of pieces. Adjacent door pieces 7a, 7b, 7c are connected to each other via a folding hinge 12, and the folding hinge 12 acts to be bent or extended. In the present embodiment, each door body 7 is configured by arranging three pieces of an upper door piece 7a, a lower door piece 7c, and a middle door piece 7b sandwiched between them in the vertical direction.

  A pair of folding hinges 12 are provided one above the other for each door body 7, and the upper folding hinge 12 includes an upper door piece 7a and an intermediate door piece 7b, and an upper door piece 7a as an intermediate door piece 7b. It connects so that it can be folded up, and the lower folding hinge 12 can also be folded so that the lower door piece 7c and the middle door piece 7b overlap and the lower door piece 7c overlaps the middle door piece 7b. Connect to

  The maximum vertical height dimension of the upper door piece 7a and the lower door piece 7c is such that when they are folded on the middle door piece 7b and overlapped with each other, they do not overlap and become bulky. It is preferable to set the dimension shorter than half of the dimension.

  The upper door piece 7a and the lower door piece 7c, which are folded with respect to the middle door piece 7b, are locked to the middle door piece 7b via a locking means (not shown), and the folded state is maintained. Therefore, the opening / closing operation of the door body 7 is performed by compactly folding the door body 7 into the size of the middle door piece 7b of each door body 7.

  In order to complete the door body 7 with the upper and lower door pieces 7a, 7c in the extended state and thereby enable the inner space of the main body 6 to be closed, the extension of the door pieces 7a, 7c is maintained. A sub-closing means 13 is provided. The sub-closing means 13 only needs to prevent the folding action of the folding hinge 12. In the illustrated example, the sub-closing means 13 is provided in a pair of upper and lower sides corresponding to the upper and lower folding hinges 12 respectively.

  The upper sub-closing means 13 includes a pair of left and right receivers 13a provided on the door surfaces facing the propelling pipe 4 of the pair of left and right door bodies 7 (upper door pieces 7a), and an upper door piece 7a. It is comprised from the rod-shaped auxiliary scissors member 13b passed between these pair of receivers 13a across the horizontal direction between them. Each receptacle 13a is formed in a U-shape so that the auxiliary hook member 13b can be inserted and removed from the left and right lateral directions, and is joined to the upper door piece 7a. The lower sub-closing means 13 has the same configuration as the upper sub-closing means 13 and is provided between the lower door pieces 7c in the lateral direction.

  The receiving device 13a is arranged so as to sandwich the upper and lower folding hinges 12 with respect to each door body 7, and is arranged between the upper door piece 7a and the middle door piece 7b, and also the middle door piece 7b and the lower door piece. 7c, so that a total of four sets are arranged, and four auxiliary scissors members 13b to be passed to each set of receiving members 13a are prepared, and the folding action of the folding hinge 12 is made by this configuration. You may make it stop. In this case, it is preferable to provide an engagement portion or the like for preventing the secondary hook member 13b from dropping on the receiving member 13a below each set.

  Accordingly, the circular inner space of the main body 6 is held in a stretched state by the pair of left and right door bodies 7, that is, the sub-closing means 13, and is further held in the closed state by the main closing means 11. It is closed by a pair of left and right mounting portions 8 for mounting a partition wall 10 composed of 7a, 7b, 7c and an opening / closing hinge 9 for connecting the pair of left and right door bodies 7 to the main body portion 6.

  As shown in FIGS. 1 and 6, there is a gap 3 between the main body 6 of the blade body 2 and the face 3, that is, a gap S having a dimension slightly larger than the dimension of the blade 5 in the propulsion direction or slightly larger than that. On the other hand, the padding 14 covering the entire partition wall 10 is detachably loaded. Therefore, the outer form of the stuffing 14 is formed to have a thickness that substantially fills the gap S, and approximately the circular inner space of the main body 6, in other words, the outer contour of the partition wall 10.

  The padding 14 is made of a synthetic resin that is lightweight and has pressure resistance against earth and sand, for example, made of foamed polystyrene.

  In the present embodiment, the stuffing 14 includes a plurality of stuffing blocks 14a and 14b, and the stuffing 14 is configured by being stuffed into the gap S by stacking these stuffing blocks 14a and 14b. In the present embodiment, the padding blocks 14a and 14b are formed so that the horizontal and horizontal dimensions are larger than the vertical and vertical dimensions, and are set so as to be stacked and stacked.

  The left and right lateral dimensions of the padding blocks 14a and 14b are formed such that they are separated at the boundary between the pair of left and right door bodies 7 except for the central padding block 14b that occupies the approximate center of the partition 10 in the vertical and horizontal directions. The center padding block 14b is disposed across the pair of door bodies 7 in the left-right direction of the pair of left and right door bodies 7, and is used at a position straddling the center in the height direction of the gap S. This is because the width of the gap S is the maximum at the center in the height direction, and therefore it is not possible to install a pair of left and right like the upper and lower stuffing blocks 14a, and it is necessary to install more side by side. It is.

  Further, in the arrangement of the stuffing block 14a around the attachment portion 8 provided to protrude from the main body portion 6 to the inner space thereof, the attachment portion 8 becomes an obstacle to the loading from the propelling tube 4 side to the face 3 side. Therefore, the stuffing block 14a is dropped from above avoiding the attachment portion 8, or as shown in FIG. 7, the attachment portion 8a is viewed from the propelling tube 4 side by moving the stuffing block 14a in the lateral direction. It is designed to be loaded on the face 3 side.

  The thickness of the stuffing 14 along the propulsion direction may be set to such an extent that it does not contact the face 3 or the partition wall 10, and may be loaded in the gap S with a space. The thickness in the propulsion direction depends on the partition wall 10. The stuffing 14 may be pressed against the face 3 by setting the pressure so as to be pressed against the face 3.

  Next, the operation of the face collapse prevention device in the propulsion method according to the present embodiment will be described. When working by the propulsion method, the pair of left and right door bodies 7 are opened. In order to prevent the face 3 from collapsing toward the propelling tube 4 through the inside of the blade body 2, that is, the inner space of the main body 6 when the operation is suspended, the padding 14 is loaded into the gap S. Then, the propelling tube 4 side is partitioned from the face 3 side so as to close the door body 7.

  First, the filling 14 is loaded into the gap S. The stuffing blocks 14a and 14b are provided by being sequentially stacked from the lower side to the upper side of the main body portion 6. As described above, the padding block 14a is packed into the gap S by dropping from above or moving in the left-right direction on the face side that is blocked from the propelling pipe 4 side by the mounting portion 8.

  After the filling 14 is loaded into the gap S, the door body 7 is closed. When closing the door body 7, the operation is performed in the order of FIG. 5 → FIG. 4 → FIG. 3 → FIG. When the door body 7 is closed to form the partition wall 10, the pair of left and right door bodies 7 folded to the size of the middle door piece 7 b are connected from the propelling pipe 4 side to the face 3 side via the opening / closing hinge 9. A rotation operation is performed toward the filling 14. Then, during the turning operation of the door body 7 or after the turning is completed, the locking means is released, and the upper door piece 7 a and the lower door piece 7 c are extended by the folding hinge 12.

  By completing the operation of moving the pair of left and right door bodies 7 in which the upper door piece 7a and the lower door piece 7c are extended toward the stuffing 14, the partition wall 10 for closing the inner space of the main body 6 is configured. The Next, the auxiliary saddle member 13b is passed between the upper and lower sets of receiving tools 13a, and the extended state of the door pieces 7a, 7b, 7c is maintained by the auxiliary closing means 13. Thereafter, the main rod member 11b is passed between the receiving groove members 11a, and the pair of door bodies 7 are held in the closed state by the main closing means 11.

  On the other hand, when the pair of left and right door bodies 7 are opened and the face 3 is exposed through the inner space of the main body 6, the main closing means 11 and the sub closing means 13 are released by following the procedure opposite to the above. By opening the door body 7 and then removing the padding 14 from the gap S, the face 3 can be exposed.

  The face falling prevention device in the propulsion method according to the present embodiment described above is provided at a position separating the gap S from the face 3 inside the main body 6 of the blade body 2 and is opened and closed by double opening. The partition wall 10 is connected to the attachment portion 8 of the main body portion 6 via an opening / closing hinge 9 and is opened to communicate the face 3 side and the propulsion pipe 4 side, and is closed to partition the face 3 side from the propulsion pipe 4 side. A pair of steel door bodies 7 that constitutes the main body, a main closing means 11 that holds the pair of door bodies 7 in a closed state, and a synthetic resin that is detachably loaded in the gap S and covers the entire partition wall 10 with respect to the face 3 The stuffing 14 includes a plurality of stuffing blocks 14a and 14b. The stuffing blocks 14a and 14b are stuffed into the gap S to form the stuffing 14, and the door body 7 includes a plurality of door pieces. 7a, 7b, 7c and door Since the door pieces 7a, 7b, 7c are held in the extended state via the auxiliary closing means 13, the hinges 12a, 7b, 7c are connected to each other so as to be bent and extended. A pair of left and right door bodies 7 configured by connecting door pieces 7a, 7b, and 7c with a folding hinge 12 to the attachment portion 8 of the body 2 are attached via an opening / closing hinge 9 so as to be integrated with the blade body 2. In addition, it is only necessary to pack the padding 14 composed of a plurality of padding blocks 14a and 14b into the gap S, and whenever it is necessary to pause the work and hide the face as in the background art, a sheet pile or the like Compared to a configuration in which a device is installed or a facility for sending air is added, the device for preventing the face 3 from collapsing can be configured extremely simply and easily.

  Moreover, unlike the background art that requires time to send air, it is only necessary to load the stuffing blocks 14a and 14b, and good workability can be ensured. Further, unlike the conventional technique using the cushion-acting air pressure, the padding blocks 14a and 14b made of synthetic resin having shape retaining properties are packed in the gap S, so that the fall of the face 13 is extremely reliably ensured. Can be prevented.

  Since the pair of door bodies 7 is a pair of left and right so as to be opened and closed by opening both left and right, it can be opened and closed horizontally, and the opening and closing work can be performed smoothly.

  Since the center stuffing block 14b is disposed across the pair of door bodies 7 in the left-right direction of the pair of door bodies 7, it is possible to prevent the door body 7 from being easily opened by the center stuffing block 14b. can do.

  Since the padding 14 is pressed against the face 3 by the partition wall 10, the face 3 can be pressed by the partition wall 10 formed by closing the pair of door bodies 7, and thereby the padding 14 can more reliably collapse the face 3. Can be prevented.

  FIG. 8 shows a modification of the door body 7. In this modification, the pair of left and right door bodies 7 shown in FIG. 2 is rotated 90 degrees to form a pair of upper and lower door bodies 7. Even with such a configuration, it is a matter of course that the same effects as those of the above-described embodiment can be obtained.

  In the modification, the main rod member 11b and the auxiliary rod member 13b are vertically oriented along the vertical height direction, so that the receiving groove member 11a is U-shaped and located on the lower side in the same manner as the receiving device 13a. The receiving tool 13a and the receiving groove member 11b are preferably provided with an engaging portion for preventing the main hook member 11b and the auxiliary hook member 13b from dropping.

2 Blade Mouth 3 Face 4 Propulsion Tube 7 Door 7a, 7b, 7c Door Piece 9 Opening / Closing Hinge 10 Bulkhead 11 Main Closing Means 12 Folding Hinge 13 Sub Closing Means 14 Stuff 14a, 14b Stuff Block S

Claims (4)

A face fall prevention device in the propulsion method that prevents the face from collapsing toward the propelling pipe through the inside of the annular blade body,
The blade is provided at a position separating the gap from the face inside the blade mouth, and is connected to the blade edge via an opening / closing hinge so as to be opened and closed by double opening, and is opened to communicate the face side and the propelling pipe side. A pair of metal doors that form a partition wall that is closed and partitions the face side from the propelling tube side;
Main closing means for holding the pair of door bodies in a closed state;
It is detachably loaded in the gap, and has a synthetic resin padding that covers the entire partition wall against the face,
The padding is composed of a plurality of padding blocks, and the padding block constitutes padding by being packed in the gap,
The door body includes a plurality of door pieces, and a folding hinge for connecting the door pieces so as to be bent and extended.
The face piece collapse prevention device in the propulsion method, wherein the door piece is held in an extended state via a sub-closing means.   The pair of left and right door bodies is a pair of left and right so as to be opened and closed with a double opening left and right, and the face collapse prevention device in the propulsion method according to claim 1.   3. The device for preventing falling of a face in the propulsion method according to claim 2, wherein any one of the stuffing blocks is disposed across the pair of door bodies in a lateral direction of the pair of door bodies.   The device for preventing falling of a face in the propulsion method according to any one of claims 1 to 3, wherein the padding is pressed against the face by the partition wall.

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