JP2019085848A - Connection structure for divided supporting - Google Patents

Abstract

To provide a technology for a connection structure for connecting a pair of divided supporting, the technology inhibiting a male type connection part and a female type connection part from being connected in an erroneous combination in the case of joining joint plates of the pair of divided supporting to each other at a plurality of locations.SOLUTION: A connection structure for divided supporting comprises: a first top end joint plate and a second top end joint plate that are provided at respective top end parts of a pair of divided supporting and are to be brought into contact with each other when the pair of divided supporting are connected; a first female type connection part and a second female type connection part that are provided on the first top end joint plate in a recessed manner; and a first male type connection part and a second male type connection part that are provided on the second top end joint plate in a projected manner. The first female type connection part includes a first insertion port into which the first male type connection part can be inserted. The second female type connection part includes a second insertion port into which the second male type connection part can be inserted. The diameter of the first insertion port is smaller than that of the second insertion port. The diameter of the first male type connection part is smaller than that of the second male type connection part and that of the first insertion port. The diameter of the second male type connection part is larger than that of the first insertion port and is smaller than that of the second insertion port.SELECTED DRAWING: Figure 14

Description

  The present invention relates to a connection structure of a split support.

The New Austrian Tunneling Method is known as a method of constructing a tunnel. The NATM method appropriately uses the shotcrete, rock bolt, and steel support under the concept of maintaining the stability of the tunnel by effectively using the support capacity and strength possessed by the ground, using the ground support and the steel support as appropriate. It is a construction method to construct an integrated tunnel structure.

  When constructing a tunnel in the NATM method, the installation of an arch-shaped steel support is usually performed according to the procedure described below. First, a sprayer is set near the face, and the face is sprayed primarily with concrete, and when this is complete, the sprayer is withdrawn. Next, a working vehicle provided with an elector for erecting a support near the face is arranged, and an arched steel support is erected by the erector on the tunnel pit wall near the face, and when this is completed, the working vehicle is withdrawn. Next, the sprayer is re-placed on the face, and the built-in tunnel support is embedded, and a secondary spray of concrete is performed to withdraw the sprayer.

  When building a steel support, a hand attached to the end of the boom of a heavy machine, such as an Electa device or a drill jumbo, holds a pair of left and right split support members divided in an arc shape to build It is common practice to build in an arch shape by butt jointing the joint plates provided at the top ends of the left and right split supports after installation, and making such an arch by manual labor. It is the fact that there is. That is, in the connection structure of divided support work using bolt connection, it is provided on a work scaffolding or boom of a heavy machine assembled in the vicinity of the face in a state where the joint plates provided on the left and right divided support works abut. Place the personnel in the mancage etc., move the personnel to the vicinity of the tunnel top end, insert the bolts into the joint plates of the split support located near the top end, and fasten the bolts with the nut It was necessary to do the consolidation work by

  On the other hand, in recent years, while providing a convex connection part in the joint board in one steel support work in right and left and providing a concave connection part in the joint board in the other steel support work, it grasps steel support work Proposed a connection structure for steel supports that enables the pair of steel supports to be connected in an arch shape by relatively moving the hand of the heavy equipment to engage the convex connection with the concave connection (See, for example, Patent Document 1).

JP, 2017-115446, A JP, 2017-106272, A JP 2000-45695 A

By the way, when joining the joint boards in a pair of steel supports, in order to make stress transmission of the joint boards reliable, it is necessary to join joint boards in multiple places. For example, in the connection structure of steel supports described in Patent Document 1, a convex connection portion and a concave connection portion are arranged in each joint plate one by one. However, it is not easy to perform the hand operation of heavy equipment with high precision, and when joining the joint plates in a pair of steel supports at a plurality of locations, the convex connecting part and the concave connecting part are connected in the wrong combination. There was a risk of

  The present invention has been made in view of the above problems, and an object thereof is to provide a joint structure for connecting a pair of split supports, in which a plurality of joint plates in a pair of split supports are provided. It is an object of the present invention to provide a technique for suppressing the connection between the male connection portion and the female connection portion in the wrong combination in the case of joining at the same position.

  The present invention for solving the above-mentioned problems is a connecting structure for connecting a pair of arc-shaped divided supports, which forms an arched tunnel support erected along a tunnel pit wall, By making the diameter of the male connection portion larger than the diameter of the insertion port in the female connection portion constituting the wrong combination, the erroneous connection of the female connection portion and the male connection portion is suppressed.

  More specifically, the present invention relates to a connecting structure for connecting a pair of arc-shaped divided supports, which forms an arched tunnel support erected along a tunnel pit wall, the pair being connected A first top end joint plate and a second top end joint plate provided respectively at the top end of the split support and are brought into contact with each other when the pair of split support is connected, and the first top end A first female connecting portion and a second female connecting portion recessed in the joint plate, and a first male connecting portion and a second male connecting portion convexly provided on the second top end joint plate; In the first top end joint plate and the second top end joint plate, the first male connection portion is connected to the first female connection portion, and the second top end joint plate is connected to the second female connection portion. The male connection portion is joined to be joined in a predetermined regular contact state, and the first female connection portion is the first male type. It has a 1st insertion port which can insert a connection part, and the 2nd female type connection part has a 2nd insertion port which can insert the 2nd male type connection part, and the diameter of the 1st insertion port is The diameter of the first male connection part is smaller than the diameter of the second male connection part and the diameter of the first insertion port, the second male connection being smaller than the diameter of the second insertion opening; The diameter of the part is larger than the diameter of the first insertion opening and smaller than the diameter of the second insertion opening.

  ADVANTAGE OF THE INVENTION According to this invention, when joining the joint boards in a pair of division | segmentation support at multiple places, it can suppress that a male type | mold connection part and a female type connection part are connected in the wrong combination.

  Further, in the present invention, the first female connection portion and the second female connection portion are recessed in parallel in the lateral width direction of the first top end joint plate, and the first male connection portion and the first female connection portion The second male connection portion is provided in a convex shape in parallel in the lateral width direction of the second top end joint plate, and a side edge located on the second female connection portion side of the first top end joint plate is: A side edge guide plate is provided protruding in a direction away from the outer surface of the first top end joint plate in the vertical direction, and when connecting the pair of divided supports, the side end guide plate The lateral position of the first male connecting portion with respect to the first female connecting portion by the side edge located on the second male connecting portion side coming into contact with the side edge guide plate, and the second female type The lateral position of the second male coupling portion with respect to the coupling portion may be configured to be aligned.

  Further, in the present invention, an upper edge guide plate is protruded at the upper edge of the first upper end joint plate in a direction away from the outer surface of the first upper end joint plate in the vertical direction, When connecting the pair of split supports, the upper edge of the second top end joint plate abuts on the upper edge guide plate, whereby the height of the first male connection portion with respect to the first female connection portion is increased. The height position of the second male connection portion with respect to the second female connection portion may be aligned with each other.

Further, in the present invention, each of the first male connection portion and the second male connection portion has a rod-shaped male locking member protruding from the second top end joint plate, and the first female The mold connection portion includes a casing having a storage chamber in which the first insertion port is formed, and locks the male locking member inserted into the storage chamber from the first insertion port, The second female connection portion includes a casing having a storage chamber in which the second insertion port is formed, and locks the male locking member inserted into the storage chamber from the second insertion port. May be configured.

  According to the present invention, in the connection structure for connecting a pair of split support work, when the joint plates in the pair of split support work are joined at a plurality of locations, the male connection portion and the female connection portion are incorrectly combined. It is possible to provide a technology that suppresses connection at

FIG. 1 is a side view of the tunnel support according to the first embodiment. FIG. 2 is a view for explaining a tunnel support structure according to the first embodiment. FIG. 3 is a schematic configuration diagram of a tunnel support construction system according to the first embodiment. FIG. 4 is a top view of the work vehicle according to the first embodiment. FIG. 5 is a side view of the work vehicle according to the first embodiment. FIG. 6 is a view showing the attachment position of the target to the tunnel support according to the first embodiment. FIG. 7 is a diagram illustrating a target according to the first embodiment. FIG. 8A is a front view of the first top end joint plate according to the first embodiment. FIG. 8B is a back view of the first top end joint plate according to the first embodiment. 8C is a side view of the first top end joint plate according to Embodiment 1. FIG. 9A is a front view of a second top end joint plate according to Embodiment 1. FIG. FIG. 9B is a back view of the second top end joint plate according to the first embodiment. FIG. 9C is a side view of the second top end joint plate according to the first embodiment. FIG. 10 is a schematic view showing a connection structure for connecting the left divided support and the right divided support according to the first embodiment. 11 is a cross-sectional view taken along the line XX in FIG. FIG. 12 is a view showing a state in which the female connection portion and the male connection portion according to the first embodiment are connected. FIG. 13A is a view for explaining a state in which the first upper end joint plate and the second upper end joint plate according to the first embodiment are joined. 13: B is a figure explaining the condition which joins the 1st top end joint board and the 2nd top end joint board concerning Embodiment 1. FIG. 13: C is a figure explaining the condition which joins the 1st top end joint board and the 2nd top end joint board concerning Embodiment 1. FIG. FIG. 14 is a view for explaining a state in which erroneous connection of the second male connection portion in the second top end joint plate with respect to the first female connection portion in the first top end joint plate according to Embodiment 1 is suppressed. is there. FIG. 15 is a diagram for explaining a connection structure according to a modification of the first embodiment.

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

First Embodiment
FIG. 1 is a side view of the tunnel support 10 according to the first embodiment. The tunnel support 10 is an arched steel support erected along a pit wall immediately after excavation for preventing collapse of the ground that is exposed during tunnel excavation, and has a fixed distance along the tunnel axial direction. It is installed every time. The tunnel support 10 in the present embodiment is formed of an H-shaped steel having an H-shaped cross section. More specifically, the tunnel support 10 includes a pair of arc-shaped divided supports 10L and 10R.
It forms in arch shape by connecting the sky end part (upper end part) of these integrally. Hereinafter, the split support 10L is referred to as "left split support", and the split support 10R is referred to as "right split support".

  The left divided support 10L includes a first main body 111, a first top end joint plate 121, and a first bottom plate 131. The first main body portion 111 is an H-shaped steel composed of a web 111a, a pair of ground-side flanges 111b orthogonal to the web 111a, and an inner air-side flange 111c. Further, the first top end joint plate 121 is welded to one end of the first main body portion 111, and the first bottom plate 131 is welded to the other end. The first top end joint plate 121 and the first bottom plate 131 are square steel flat plates and extend in a direction orthogonal to the H-shaped cross section of the first main body portion 111. Similarly, the right divided support 10R has a second main body 112, a second top end joint plate 122, and a second bottom plate 132. The second main body portion 112 is an H-shaped steel composed of a web 112a, a pair of ground-side flanges 112b orthogonal to the web 112a, and an inner air-side flange 112c. Further, the second top end joint plate 122 is welded to one end of the second body portion 112, and the second bottom plate 132 is welded to the other end. The second top end joint plate 122 and the second bottom plate 132 are square steel flat plates and extend in a direction orthogonal to the H-shaped cross section of the second main body 112. In the present embodiment, the first top end joint plate 121 and the second top end joint plate 122 have a congruent square plane. As shown in FIG. 1, the left split support 10L and the right split support 10R are connected in a state where the first top end joint plate 121 and the second top end joint plate 122 are butted against each other.

  FIG. 2 is a view for explaining the tunnel support structure 1 according to the first embodiment. The code | symbol 3 in FIG. 2 is a primary shotcrete layer. Moreover, the code | symbol 6 is a secondary blasting concrete layer. The right divided support 10R of the tunnel support 10 is shown in FIG. In the tunnel construction method of the present embodiment, after the underground 7 is exposed to the side of the tunnel T by excavating the face 8, the primary concrete is sprayed with the primary concrete by means of the primary concrete. Layer 3 is formed. Thereafter, the above-described arched tunnel support 10 is built on the inner air side of the primary blasting concrete layer 3 along the tunnel pit wall surface. The tunnel support 10 is adjacent to the face 8 with respect to the existing tunnel support 10 located on the wellhead side of the tunnel T, and has a predetermined distance (for example, 1.0 m to 1.5 m) in the axial direction of the tunnel T Degree) are arranged. The construction of the tunnel support 10 is performed using an elector apparatus provided with a hand attached to a pair of boom tips. Hereinafter, the construction method of the tunnel support 10 will be described in detail.

  FIG. 3 is a schematic configuration diagram of a construction system S of the tunnel support 10 according to the first embodiment. In the figure, reference numeral 100 denotes an elector device for building the tunnel support 10, and reference numeral 200 denotes a working vehicle (heavy machine) on which the elector device 100 is mounted and which can be self-propelled. Reference numeral 300 denotes an automatic tracking total station which is a range finder / measuring instrument (surveying instrument) by laser light, reference numeral 400 denotes a total station controller for controlling the total station 300, and reference numeral 500 denotes a total station side capable of wirelessly transmitting to and receiving from the total station controller 400. It is an antenna.

  The elector device 100 has a monitor 101 which is a display device mounted on a driver's seat, an elector controller 102, an elector antenna 103, an operation panel 104, a keyboard 105, a pointing device 106 and the like.

The total station 300 is a surveying instrument for measuring (surveying) the position of the target 9 by irradiating a laser beam and automatically tracking the target 9 including a prism or the like, and performing ranging and angle measurement thereof. The coordinates are set at known points (coordinate known points). In the present embodiment, the target 9 is attached to the tunnel support 10 (left split support 10L and right split support 10R) built in the face 8, and the tunnel support 10 (left split support 10L and right split support 10R) Since the target 9 is automatically tracked along with the movement of, it is preferable to select and install a position where there is no obstacle in the automatic tracking and collimation of such a target. For example, it may be installed on a tunnel floor surface, or a gantry may be erected on the ceiling and the total station 300 may be installed on the gantry.

  The total station controller 400 includes, for example, a portable computer. The total station controller 400 automatically controls various mechanisms of the total station 300 by software incorporated in a computer, and processes survey data of the total station 300. Furthermore, the total station controller 400 can transmit and receive data by wireless communication with the elector controller 102, and can remotely control various mechanisms of the total station 300 by an instruction from the elector controller 102. .

  FIG. 4 is a top view of the work vehicle 200 according to the first embodiment. FIG. 5 is a side view of the work vehicle 200 according to the first embodiment. The work vehicle 200 includes an elector device 100 and a spray device 600. The elector apparatus 100 includes a pair of booms 17L and 17R having the same configuration. The pair of booms 17L and 17R can freely extend and retract, tilt, swing and turn by operation of a drive mechanism attached thereto. Further, a pair of hands 18L and 18R having the same configuration are connected to the tips of the booms 17L and 17R. The pair of hands 18L and 18R can freely rotate and swing by the operation of the drive mechanism attached thereto, and the left split support 10L and the right split support 10R can be detachably pinched and held. )can do.

  Hereinafter, the boom indicated by reference numeral 17L is referred to as "left boom", and the boom indicated by reference numeral 17R is referred to as "right boom". The hand indicated by reference numeral 18L is referred to as a "left hand", and the hand indicated by reference numeral 18R is referred to as a "right hand". The elector device 100 can detachably hold the left divided support 10L on the left hand 18L and can detachably hold the right divided support 10R on the right hand 18R. In the present embodiment, the left split support 10L and the right split support 10R are a pair of support members obtained by dividing the arched tunnel support 10 into two, and after being guided in the vicinity of the face 8, these are used as the face 7. Assemble to form an arched tunnel support 10 at 8.

  FIG. 6 is a view showing the attachment position of the target to the tunnel support according to the first embodiment. As shown in FIG. 6, the left divided support 10L and the right divided support 10R are in the shape of a symmetrical arc. Here, the first target 9a and the second target 9b are attached to the upper end portion and the lower end portion of the left divided support 10L, respectively. In the right divided support 10R, the third target 9c and the fourth target 9d are attached to the upper end and the lower end, respectively. Here, the first to fourth targets 9a to 9d are collectively referred to as "targets 9". FIG. 7 is a view showing the target 9 according to the first embodiment. The target 9 has a magnet 92 provided at the proximal end of the holder 91 and a prism 93 provided at the tip of the holder 91. Since the left split support 10L and the right split support 10R are made of steel, the target 9 is detachably attached to the left split support 10L and the right split support 10R by the magnetic force of the magnet 92 provided in the holder 91. be able to.

Further, in the example shown in FIG. 7, the target 9 is attached to the inner side flanges 111c and 112c of the left divided support 10L and the right divided support 10R. In the present embodiment, marks for attaching the targets 9 are marked in advance by paint or the like on the inner side flanges 111c and 112c of the left divided support 10L and the right divided support 10R. Further, in a state where each target 9 is attached to the inner side flanges 111c and 112c of the left divided support 10L and the right divided support 10R, the height Hp from the mounting surface to the center of the prism 93 is constant.

  Next, the spraying device 600 will be described with reference to FIGS. 4 and 5. The spraying device 600 is disposed between the left boom 17L and the right boom 17R, and the arm 601, the spraying robot 602 supported by the arm 601, and the spraying provided on the tip side of the spraying robot 602. The nozzle 603 and the like are provided. The arm 601 is capable of telescopic operation, tilting operation and the like. In addition, the spraying robot 602 can perform tilting operation, rotating operation and the like of the spraying nozzle 603. In addition, the spray device 600 is provided with a concrete pump, a accelerator supply device, a compressor, a high pressure water pump and the like. The spray robot 602 can spray the blown concrete onto the face 8 by discharging the sprayed concrete supplied from the concrete pump from the spray nozzle 603.

  Next, a method of building the tunnel support 10 in the present embodiment will be described. The NATM method consists of (1) blasting the face 8 or excavating by machine → (2) carrying out the slip → (3) spraying the primary shotcrete → (4) building the tunnel support → (5) the secondary blow It is a construction method in which the tunnel T is stretched in the axial direction by repeating the setting concrete spraying → (6) placing a lock bolt as one cycle. In the present embodiment, (2) after the step of carrying out the slip has been completed, the work vehicle 200 equipped with the elector device 100 is disposed in the vicinity of the cutting face 8 (erector placement step). At this time, the working vehicle 200 is allowed to self-run in a state in which the left split support 10L and the right split support 10R are gripped along the tunnel axis (tunnel extending direction) in the hands 18L and 18R of the elector device 100, respectively. , Placed in the vicinity of the face 8. Then, the primary blasting concrete layer 3 is applied to the ground 7 (tunnel pit wall surface) on which the left split support 10L and the right split support 10R are to be built from now, using the spraying device 600 to spray the primary blasting concrete. Form.

  Next, the left split support 10L and the right split support 10R are held by holding the left split support 10L and the right split support 10R in the respective hands 18L and 18R while driving the respective hands 18L and 18R. Mutually connect with each other (support work connection process). Hereinafter, the connection structure of the tunnel support 10 (the left split support 10L and the right split support 10R) will be described.

  8A is a front view of the first top end joint plate 121. FIG. 8B is a rear view of the first top end joint plate 121. FIG. 8C is a side view of the first top end joint plate 121. FIG. Here, reference numeral 121 a is the outer surface of the first top end joint plate 121, and reference numeral 121 b is the inner surface of the first top end joint plate 12 L. Reference numeral 121c is the upper edge of the first top end joint plate 121, reference numeral 121d is the lower edge of the first top end joint plate 121, reference numeral 121e is the first side edge of the first top end joint plate 121, and reference numeral 121f is the first top edge. It is a second side edge of the end joint plate 121. Here, the lower edge 121d of the first top end joint plate 121 faces the inner air side of the tunnel T when the left divided support 10L and the right divided support 10R are connected, and the upper edge 121c is opposite to that That is, it faces the ground 7 side. The second side edge 121f of the first top end joint plate 121 faces the face 8 side of the tunnel T when the left divided support 10L and the right divided support 10R are connected, and the first side 121e is It opposes the other side, ie, the side of the work vehicle 200 (electr apparatus 100).

In FIG. 8B, the end shape of the first main portion 111 connected to the first top end joint plate 121 is indicated by a broken line. Moreover, the up-down direction (height direction) and horizontal width direction of the 1st top end joint board 121 are illustrated in FIG. 8A and FIG. 8B. The vertical direction of the first top end joint plate 121 is parallel to the extending direction of the first side edge 121e and the second side edge 121f, and the position where the first main body portion 111 is connected to the first top end joint plate 121 Parallel to the stretching direction of the web 111a. In addition, the ground width side of the first top end joint plate 121 is parallel to the extension direction of the upper edge 121 c and the lower edge 121 d, and the ground side at the position where the first main body portion 111 is connected to the first top end joint plate 121 It is parallel to the extension direction of the flange 111b and the inner air side flange 111c.

  FIG. 9A is a front view of the second top end joint plate 122. FIG. FIG. 9B is a rear view of the second top end joint plate 122. FIG. FIG. 9C is a side view of the second top end joint plate 122. FIG. Here, reference numeral 122 a is an outer surface of the second top end joint plate 122, and reference numeral 122 b is an inner surface of the second top end joint plate 122. Further, reference numeral 122c is an upper edge of the second top end joint plate 122, reference numeral 122d is a lower edge of the second top end joint plate 122, reference numeral 122e is a first side edge of the second top end joint plate 122, and reference numeral 122f is a second side edge. 2 is a second side edge of the top end joint plate 122. Here, the lower edge 122d of the second top end joint plate 122 faces the inner air side of the tunnel T when the left split support 10L and the right split support 10R are connected, and the upper edge 122c is opposite to that That is, it faces the ground 7 side. The second side edge 122f of the second top end joint plate 122 faces the face 8 side of the tunnel T when the left divided support 10L and the right divided support 10R are connected, and the first side edge 122e is It opposes the other side, ie, the side of the work vehicle 200 (electr apparatus 100).

  In FIG. 9B, the end shape of the second main body 112 connected to the second top end joint plate 122 is indicated by a broken line. 9A and 9B illustrate the vertical direction and the width direction of the second top end joint plate 122. The vertical direction of the second top end joint plate 122 is parallel to the extension direction of the first side edge 122 e and the second side edge 122 f, and at a position where the second main body 112 is connected to the second top end joint plate 122 It is parallel to the stretching direction of the web 112a. In addition, the ground width side of the second top end joint plate 122 is parallel to the extension direction of the upper edge 122 c and the lower edge 122 d, and the ground side at a position where the second main body portion 112 is connected to the second top end joint plate 122 It is parallel to the extension direction of the flange 112 b and the inner air side flange 112 c.

  As shown in FIGS. 8A and 8B, the first top end joint plate 121 has a substantially square planar shape. Further, as shown in FIGS. 9A and 9B, the second top end joint plate 122 also has a substantially square planar shape, similarly to the first top end joint plate 121. Then, the upper and lower dimensions of the first top end joint plate 121 and the second top end joint plate 122 are equal to each other, and the lateral width dimensions are equal to each other. More specifically, the first top end joint plate 121 and the second top end joint plate 122 have upper edges 121c and 122c, lower edges 121d and 122d, first side edges 121e and 122e, and a second side edge 121f, respectively. , 122f are equal.

  In the first top end joint plate 121, a pair of female connection portions 40 (a first female connection portion 40A and a second female connection portion 40B) are arranged in the lateral width direction of the first top end joint plate 121 and recessed. It is done. Further, in the second top end joint plate 122, a pair of male connection portions 50 (a first male connection portion 50A and a second male connection portion 50B) are arranged in the lateral width direction of the second top end joint plate 122. It is provided convexly. The connection structure 30 for connecting the left split support 10L and the right split support 10R includes a pair of female connectors 40 (a first female connector 40A and a second female connector 40B) and a pair of male connectors 50 (a first male connector 50A and a second male connector 50B).

In the first top end joint plate 121, the first female connection portion 40A is recessed in the first region A1, and the second female connection portion 40B is recessed in the second region A2. The first area A1 is located on the first side edge 121e side of the first top end joint plate 121 with the web 111a of the first main body portion 111 as a boundary, and the ground side flange 111b and the inner air side flange It is an area surrounded by 111c and the web 111a. The second area A2 is located on the second side edge 121f side of the planar area of the first top end joint plate 121 with the web 111a of the first main body portion 111 as a boundary, and also has a ground side flange 111b and an inner air side flange It is an area surrounded by 111c and the web 111a. Further, as shown in FIG. 8A, the first male connection portion 50A is provided in the vicinity of the first side edge 121e, and the second female connection portion 40B is provided in the vicinity of the second side edge 121f. There is. In the first top end joint plate 121, the first female connecting portion 40A and the second female connecting portion 4
0 B are arranged at the same height in the vertical direction of the first top end joint plate 121, and are arranged side by side along the lateral width direction of the first top end joint plate 121. That is, the arrangement direction of the first female connecting portion 40A and the second female connecting portion 40B in the first top end joint plate 121 coincides with the lateral width direction of the first top end joint plate 121.

  Further, in the second top end joint plate 122, the first male coupling portion 50A is convexly provided in the third region A3, and the second male coupling portion 50B is convexly provided in the fourth region A4. The third region A3 is located on the first side edge 122e side of the flat region of the second top end joint plate 122 with the web 112a of the second main body 112 as a boundary, and the landslide flange 112b and the inner air side It is an area surrounded by the flange 112c and the web 112a. The fourth area A4 is located on the second side edge 122f side of the planar area of the second top end joint plate 122 with the web 112a of the second main body 112 as a boundary, and also has the ground-side flange 112b and the inner air side It is an area surrounded by the flange 112c and the web 112a. Further, as shown in FIG. 9A, the first male connection portion 50A is provided in the vicinity of the first side edge 122e, and the second male connection portion 50B is provided in the vicinity of the second side edge 122f. There is. Further, in the second top end joint plate 122, the first male connection portion 50A and the second male type connection portion 50B are disposed at the same height in the vertical direction of the second top end joint plate 122, and They are arranged side by side along the width direction of the top end joint plate 122. That is, the arrangement direction of the first male coupling portion 50A and the second male coupling portion 50B in the second top end joint plate 122 coincides with the lateral width direction of the second top end joint plate 122. Furthermore, the center-to-center distance between the first female connection 40A and the second female connection 40B in the lateral width direction of the first top end joint plate 121 is the first male connection in the lateral width direction of the second top end joint plate 122. The dimension is set to be equal to the center-to-center distance between the portion 50A and the second male coupling portion 50B.

  In addition, although the details will be described later, the first upper end joint plate 121 and the second upper end joint plate 122 in the present embodiment are a first female type when the left divided support 10L and the right divided support 10R are connected. The first male coupling portion 50A is coupled to the coupling portion 40A, and the second male coupling portion 50B is coupled to the second female coupling portion 40B, whereby the first top end joint plate 121 and the second top end are connected. The joint plates 122 are joined to each other in a predetermined regular contact state. Here, in the normal contact state, the outer surfaces 121a and 122a are in surface contact with each other such that stress transmission between the first upper end joint plate 121 and the second upper end joint plate 122 is smoothly performed. It is defined as a state.

  When the first top end joint plate 121 and the second top end joint plate 122 are joined in a normal abutting state, the upper edge 121 c of the first top end joint plate 121 and the upper edge of the second top end joint plate 122 The lower edge 121d of the first top end joint plate 121 and the lower edge 122d of the second top end joint plate 122 overlap each other. Further, the first side edge 121e of the first top end joint plate 121 and the first side edge 122e of the second top end joint plate 122 overlap with each other, and the second side edge 121f of the first top end joint plate 121 and the second top end plate The second side edges 122f of the end joint plate 122 overlap each other.

Furthermore, the first top end joint plate 121 in the present embodiment has a side edge guide plate 1213 and an upper edge guide plate 1214. As shown in FIGS. 8A to 8C, the side edge guide plate 1213 and the upper edge guide plate 1214 each have a rectangular flat plate shape, and are formed of steel. The side edge guide plate 1213 is attached by welding or the like to the second side edge 121 f located on the second female connection portion 40 B side of the first top end joint plate 121, and the first top end joint plate 121 Protruding toward the front of the In addition, in this specification, the "front" of the 1st top end joint board 121 means the direction separated from the outer surface 121a of the 1st top end joint board 121 in the perpendicular direction. The upper edge guide plate 1214 is attached to the upper edge 121 c of the first top end joint plate 121 by welding or the like, and is protruded toward the front of the first top end joint plate 121. The side edge guide plate 1213 is provided in the vicinity of the central portion of the second side edge 121 f of the first top end joint plate 121 in the vertical direction of the first top end joint plate 121. Further, the upper edge guide plate 1214 is provided in the vicinity of the central portion in the lateral width direction of the first upper end joint plate 121 among the upper edge 121 c of the first upper end joint plate 121.

  FIG. 10 is a schematic view showing a connecting structure 30 for connecting the left divided support 10L and the right divided support 10R according to the first embodiment. FIG. 10 shows a state before the left divided support 10L and the right divided support 10R are connected via the connection structure 30, that is, the first top end joint plate 121 and the second top end joint plate 122 are separated. Is shown.

  First, the pair of male connecting portions 50 (the first male connecting portion 50A and the second male connecting portion 50B) provided in a convex shape on the second top end joint plate 122 will be described. Opening holes 1222 are formed in the second top end joint plate 122 at positions where the pair of male coupling portions 50 (first male coupling portion 50A and second male coupling portion 50B) are provided. The male connection portion 50 also has a rod-shaped male locking member 51. The male locking member 51 is a shaft member slightly smaller in diameter than the opening hole 1222 of the second top end joint plate 122, and a male screw 51a is cut at the base end thereof. Further, an annular collar 51 b is provided in the middle of the male locking member 51. Further, an external thread 51 c is formed on the outer peripheral portion at a portion on the tip end side of the flange portion 51 b of the male locking member 51. The male screw 51 c of the male locking member 51 is a circumferential male locking groove provided in parallel on the outer periphery of the male locking member 51. Further, a tapered surface 51e is formed at the tip end portion 51d of the male locking member 51 so as to decrease in diameter toward the tip end.

  Further, around the opening hole 1222 on the outer surface 122a side of the second top end joint plate 122, a counterbore portion 1223 recessed one step from the periphery is formed. The collar 51 b of the male locking member 51 is larger than the diameter of the opening hole 1222 of the second top end joint plate 122. The base end side of the male locking member 51 is inserted into the opening hole 1222 from the outer surface 122a side of the second top end joint plate 122, and the male screw 51a of the base end portion is disposed with the collar portion 51b arranged in the counterbore portion 1223. Screw in the nut 52 on the As a result, the male locking member 51 can be fixed to the second top end joint plate 122 in a state where the male locking member 51 protrudes from the second top end joint plate 122.

  Next, the pair of female connection portions 40 (the first female connection portion 40A and the second female connection portion 40B) recessed in the first top end joint plate 121 will be described. In the first top end joint plate 121, the opening holes 1212 are bored respectively at positions where the pair of female connection portions 40 (the first female connection portion 40A and the second female connection portion 40B) are provided. A cylindrical casing 41 made of metal is fixed to the inner surface 121b by welding wp or the like. The casing 41 has its axial center located substantially at the center of the opening 1212. In the casing 41, a storage chamber 42 is formed. A tapered hole 43 having a tapered surface 43a whose inner diameter gradually decreases from the rear end side to the front end side is formed at the tip portion (front portion) of the storage chamber 42. Further, a spring storage portion 42 a is formed in the middle portion of the storage chamber 42, and a female screw 45 is engraved on the rear inner periphery of the storage chamber 42. In addition, an insertion port 48 is formed at the tip of the tapered hole 43. The insertion port 48 located at the front end portion of the casing 41 communicates with the opening hole 1212 with substantially the same diameter as the opening hole 1212 formed in the first top end joint plate 121. Further, the insertion port 48 is disposed at a position overlapping the opening hole 1212 in a state where the casing 41 is fixed to the first top end joint plate 121.

Further, in the tapered hole 43, the divided female locking member 46 is disposed slidably in the axial direction. In the present embodiment, as shown in FIG. 11, a wedge-shaped female locking member 46 divided into three in the circumferential direction is disposed slidably in the axial (front-rear) direction of the casing 41. . 11 is a cross-sectional view taken along the line XX in FIG. Here, the outer surface of the female locking member 46 is formed as a tapered surface 46 a which can slide along the tapered surface 43 a of the tapered hole 43. The tapered surface 46a of the female locking member 46 gradually increases in outer diameter from the tip end side to the rear. Further, on the inner surface of each female locking member 46, a female screw 46b is formed. The female screw 46 b is a plurality of circumferential female locking grooves provided in parallel on the inner surface of each female locking member 46.
The female screw 46 b is a circular arc centered on the axial center of the casing 41 and is engraved in the direction along the axial center. As described above, a female screw hole is formed by the plurality of female locking members 46, and the tapered surface 46a of each female locking member 46 is retracted along the tapered surface 43a of the tapered hole 43, whereby the female screw is formed. The diameter of the hole is increased, and the female screw hole is reduced in diameter by moving forward (forward). The female screw 46 b formed on the inner surface of each female locking member 46 can be engaged with the male screw 51 c formed on the outer peripheral portion on the tip side of the male locking member 51.

  Further, in the spring storage portion 42 a of the storage chamber 42, a pressing spring 44, which is a pressing member for pressing (elastically biasing) the female locking member 46 forward (forward), is disposed behind each female locking member 46. It is housed in a compressed state between a spring receiver 47 provided at an end and a cover plate 49, and the pressing force of the pressing spring 44 always presses the respective female locking members 46 forward. The cover plate 49 is screwed to the female screw 45 provided on the inner peripheral side of the rear portion of the storage chamber 42, whereby the pressure spring 44 can be held in a compressed state. A hexagonal hole 49a is provided on the outer surface of the cover plate 49, and the cover plate 49 can be attached to and detached from the casing 41 with a hexagonal wrench.

  In the female connector 40 and the male connector 50 configured as described above, the female screw 46 b formed on the inner surface of each female locking member 46 and the outer peripheral portion of the male locking member 51 are formed. The thread pitch of the male screw 51c is smaller than the pitch of the fine thread specified in JIS. Further, in the female connection portion 40 of the present embodiment, the spiral female screw 46b is formed on the inner surface of each female locking member 46, but instead of the female screw 46b, the circumferential direction of each female locking member 46 Parallel grooves may be provided on the inner surface of each female locking member 46 in which annular ridges and annular valleys extending alternately are arranged alternately and in parallel. Similarly, in the male connection portion 50, instead of the male screw 51c formed on the outer peripheral portion of the male locking member 51, an annular peak and annular valley extending in the circumferential direction of the male locking member 51 Parallel grooves may be provided on the outer peripheral surface of the male locking member 51.

  When the male locking member 51 convexly provided on the second top end joint plate 122 intrudes from the insertion port 48 of the female connection portion 40 through the opening hole 1212 of the first top end joint plate 121, the pressing spring 44 is pushed. The front end portion 51d of the male locking member 51 abuts on the front end surface 46c of each female locking member 46 positioned at the frontmost position of the tapered hole 43 (taper surface 43a) at the front end by pressure. Then, the male locking member 51 resists the pressing force of the pressing spring 44, and the respective female locking members 46 are directed rearward in the axial direction of the female connecting portion 40 (casing 41) along the tapered surface 43a. As a result, the male locking member 51 is inserted into the storage chamber 42 while the female screw hole formed by the female screw 46 b of the tapered surface 46 a of each female locking member 46 is expanded.

  Then, the outer surface 121a of the first top end joint plate 121 and the outer surface 122a of the second top end joint plate 122 are in contact with each other by surface contact, and the male locking member into the storage chamber 42 of the female connection portion 40 When the insertion of the male locking member 51 into the storage chamber 42 is stopped by the completion of the insertion of the 51, each female locking member 46 is moved forward by the pressing force of the pressing spring 44. ) And the diameter of the female screw hole formed by the tapered surface 46a of each female locking member 46 is reduced. As a result, as shown in FIG. 12, the female screw 46 b (female locking groove) of each female locking member 46 in the female connector 40 and the male screw of the male locking member 51 in the male connector 50 51c (male locking groove) mesh with each other. As a result, the first top end joint plate 121 and the second top end joint plate 122 are joined in a surface contact state (normal contact state). As a result, as shown in FIG. 1, an arched tunnel support 10 is formed by the left divided support 10L and the right divided support 10R interconnected with each other. As described above, in the present embodiment, the female connecting portion 40 recessed in the first top end joint plate 121 of the left side split support 10L and the second top end joint plate 122 of the right side split support 10R are convex. The provided male connection portion 50 (male locking member 51) functions as a one-touch joint connected by one-touch operation.

Further, as shown in FIG. 12, with the female screw 46 b of the female connector 40 and the male screw 51 c of the male connector 50 (male locking member 51) meshing with each other, the first top end joint plate 121 When an external force acts in the direction of separating the second top end joint plate 122, a pulling force acts in the direction in which the male locking member 51 is pulled out from the storage chamber 42 in the female connection portion 40. The pullout force is transmitted to the respective female locking members 46 via the male screw 51c and the female screw 46b which are engaged with each other. The outer diameter of the tapered surface 46a of each female locking member 46 gradually decreases from the rear side to the front side. Therefore, even if the extraction force acts on each female locking member 46, the displacement of each female locking member 46 toward the front of the tapered hole 43 is limited.

  That is, according to the connection structure 30 according to the present embodiment, even when an external force acts in the direction in which the male locking member 51 is pulled out from the storage chamber 42 of the female connection portion 40, the connection state is countered against the external force. Can be maintained. That is, according to the connection structure 30 in the embodiment, the male connection 50 (male locking member 51) is only inserted from the insertion port 48 of the female connection 40 to the female connection 40. Since the male connector 50 is connected, the left split support 10L and the right split support 10R can be easily joined together. Further, even if the pull-out force acts in the direction in which the male locking member 51 is pulled out from the storage chamber 42 in the female connection portion 40, the connection between the female connection portion 40 and the male connection portion 50 is prevented from being released. it can.

  By the way, the connection structure 30 in the present embodiment is that the second male connection portion 50B is erroneously connected to the first female connection portion 40A when the left divided support 10L and the right divided support 10R are connected. It has a structure for suppressing. Hereinafter, the misconnection suppression structure which suppresses misconnection of the 2nd male type connection part 50B with respect to 1st female type connection part 40A is demonstrated. Here, the insertion port 48 of the first female connection portion 40A in the first top end joint plate 121 is referred to as "first insertion port 48A", and the insertion port 48 of the second female connection portion 40B is referred to as "second insertion port Call it 48B. Further, among the opening holes 1212 provided in the first top end joint plate 121, the opening hole 1212 provided at a position corresponding to the first female connection portion 40A is called "first opening hole 1212A", and the second An opening 1212 provided at a position corresponding to the female connection portion 40B is referred to as a "second opening 1212B". Further, the male locking member 51 of the first male coupling portion 50A in the second top end joint plate 122 is referred to as "first male locking member 51A", and male locking of the second male coupling portion 50B. The member 51 is referred to as "second male locking member 51B". The first opening 1212A and the second opening 1212B, and the first insertion port 48A and the second insertion port 48B in the first top end joint plate 121 are illustrated in FIG. 8A. The first male locking member 51A and the second male locking member 51B of the second top end joint plate 122 are illustrated in FIG. 9A.

  In the present embodiment, the diameter (inner diameter) Di1 of the first insertion port 48A in the first female connection portion 40A is relative to the diameter (inner diameter) Di2 of the second insertion port 48B in the second female connection portion 40B. Is set to a small size. Further, the diameter (inner diameter) Di3 of the first opening 1212A in the first top end joint plate 121 is set to a dimension equal to the diameter (inner diameter) Di1 of the first insertion opening 48A, but the diameter of the first insertion opening 48A It may be larger than the diameter (inner diameter) Di1. Further, the diameter (inner diameter) Di4 of the second opening 1212B in the second top end joint plate 122 is set to a dimension equal to the diameter (inner diameter) Di2 of the second insertion opening 48B, but the diameter of the second insertion opening 48B It may be larger than the diameter (inner diameter) Di2.

Further, the diameter (outer diameter) Do1 of the first male locking member 51A in the first male connecting portion 50A is the diameter (outer diameter) Do2 of the second male locking member 51B in the second male connecting portion 50B. The dimensions are set relatively small compared to. Further, the diameter (outside diameter) Do1 of the first male locking member 51A is set to a size slightly smaller than the diameter (inner diameter) Di1 of the first insertion port 48A in the first female connecting portion 40A. Further, the diameter (outer diameter) Do1 of the first male locking member 51A is disposed at the most advanced position of each of the female locking members 46 in the first female connecting portion 40A in the tapered hole 43 (taper surface 43a). In this state, the diameter is set to be slightly larger than the diameter of the female screw hole formed by each female locking member 46. Therefore, at the time of joining the first top end joint plate 121 and the second top end joint plate 122, the first male locking member 51A in the first male connection portion 50A is made to be the first in the first top end joint plate 121. The female screw 46b of each female locking member 46 and the male screw 51c of the first male locking member 51A are inserted into the storage chamber 42 of the first female coupling portion 40A through the opening 1212A and the first insertion port 48A. The first male connection portion 50A and the first female connection portion 40A can be connected by meshing them with each other.

  Furthermore, in the present embodiment, the diameter (outer diameter) Do2 of the second male locking member 51B in the second male connecting portion 50B is the diameter (inner diameter) of the first insertion port 48A in the first female connecting portion 40A. It is set to a size larger than Di1. As a result, the second male locking member 51B in the second male coupling portion 50B is not inserted into the storage chamber 42 of the first female coupling portion 40A through the first insertion port 48A. Further, the diameter (outer diameter) Do2 of the second male locking member 51B in the second male connecting portion 50B is slightly smaller than the diameter (inner diameter) Di2 of the second insertion port 48B in the second female connecting portion 40B. It is set to the dimensions. Further, with respect to the diameter (outer diameter) Do2 of the second male locking member 51B, each female locking member 46 in the second female coupling portion 40B is disposed at the most advanced position of the tapered hole 43 (taper surface 43a) In this state, the diameter is set to be slightly larger than the diameter of the female screw hole formed by each female locking member 46. Therefore, at the time of joining the first top end joint plate 121 and the second top end joint plate 122, the second male locking member 51B in the second male connection portion 50B can be used as the second male locking member 51B in the second top end joint plate 122. The female screw 46b of each female locking member 46 and the male screw 51c of the second male locking member 51B are inserted into the storage chamber 42 of the second female coupling portion 40B through the opening hole 1222A and the second insertion port 48B. The second male connection portion 50B and the second female connection portion 40B can be connected by meshing them with each other.

  Next, a procedure for connecting the left divided support 10L and the right divided support 10R will be described. When connecting the left divided support 10L and the right divided support 10R, first, the elector device 100 grips the left divided support 10L with the left hand 18L and holds the right divided support 10R with the right hand 18R. Next, the elector device 100 appropriately extends and tilts the left boom 17L and the right boom 17R, and rotates the left hand 18L and the right hand 18R, to thereby divide the left split support 10L and the right split support 10R with the tunnel shaft. Move to be orthogonal. Driving of each boom 17L, 17R and each hand 18L, 18R in the elector apparatus 100 can be performed by operating the control panel 104.

  FIGS. 13A to 13C are diagrams for explaining the situation in which the first top end joint plate 121 and the second top end joint plate 122 are joined when connecting the left divided support 10L and the right divided support 10R. 13A to 13C, the upper stage shows the planar positional relationship between the first top end joint plate 121 and the second top end joint plate 122 in the upper stage, and the first top end joint plate 121 and the second top end joint plate 122 in the lower stage. Shows the separated positional relationship of The elector device 100 relatively moves the pair of hands 18L and 18R in a state in which the left split support 10L and the right split support 10R are gripped, so that the first top end joint plate 121 and the second top end joint plate 122 can be It arrange | positions in the "initial state at the time of top end plate joining" shown to FIG. 13A which outer surface 121a, 122a approached and confront | faced (faced) each other. The planar relative positional relationship between the first upper end joint plate 121 and the second upper end joint plate 122 in the initial state at the time of connecting the upper end plates is the upper side of the first upper end joint plate 121 in the height direction in the tunnel. The upper edge 122c of the second top end joint plate 122 is slightly lower than the edge 121c (that is, the second top end joint plate 122 is positioned on the inner side), and the first top end in the tunnel axial direction The second side edge 122 f of the second top end joint plate 122 is disposed slightly ahead of the second side edge 121 f of the joint plate 121 (position closer to the elector device 100).

From the initial state at the time of joining the top end plate shown in FIG. 13A, as shown in FIG. 13B, the height of the upper edge 122c of the second top end joint plate 122 matches the upper edge 121c of the first top end joint plate 121, The position of the second side edge 122 f of the second top end joint plate 122 matches the second side edge 121 f of the first top end joint plate 121 in the tunnel axial direction, and the outer surface of the first top end joint plate 121 The first top end joint plate 121 and the second top end joint plate 122 are relatively approached so as to narrow the distance between the outer surface 122 a of the second top end joint plate 122 and the outer surface 122 a of the second top end joint plate 122. In other words, the first top end joint plate 121 and the second top end joint plate 122 are relatively close to each other so as to overlap in a planar manner. At that time, for example, with the position of the left hand 18L holding the left divided support 10L fixed, by driving the right hand 18R holding the right divided support 10R, with respect to the first top end joint plate 121 The second top end joint plate 122 may be gradually approached.

  As described above, the first top end joint plate 121 is provided with the side edge guide plate 1213 at the second side edge 121 f and the upper edge guide plate 1214 at the upper edge 121 c. Accordingly, the upper edge 122c and the second side edge 122f of the second top end joint plate 122 abut on the side edge guide plate 1213 and the upper edge guide plate 1214 of the first top end joint plate 121, respectively, thereby the first The planar positioning of the second top end joint plate 122 with respect to the end joint plate 121 is completed, and the upper edge 122 c of the second top end joint plate 122 overlaps the upper edge 121 c of the first top end joint plate 121. The second side edge 122 f of the second top end joint plate 122 is overlapped with the second side edge 121 f of the end joint plate 121. In other words, the first top end joint plate 121 and the second top end joint plate 122 overlap in a planar manner. Hereinafter, this state is referred to as "positioning completed state".

  Here, when the side edge guide plate 1213 of the first top end joint plate 121 abuts on the second side edge 122 f of the second top end joint plate 122, the first male type relative to the first female connection portion 40A The lateral position of the connecting portion 50A and the lateral position of the second male connecting portion 50B with respect to the second female connecting portion 40B are aligned. Further, when the upper edge 122c of the second top end joint plate 122 abuts on the upper edge guide plate 1214 of the first top end joint plate 121, the first male connection portion 50A with respect to the first female connection portion 40A. And the height position of the second male connection portion 50B with respect to the second female connection portion 40B. That is, in the positioning completed state in which the upper edge 122c and the second side edge 122f of the second top end joint plate 122 abut on the side edge guide plate 1213 and the upper edge guide plate 1214 of the first top end joint plate 121, respectively. At the same time as the second top end joint plate 122 planarly overlaps the first top end joint plate 121, the first female connecting portion 40A and the first male connecting portion 50A, and the second female connecting portion 40B and the second The male coupling portions 50B are in a state of being overlapped in plan view.

  Therefore, the first upper end joint plate 121 and the second upper end joint plate are moved in a direction in which the outer surface 121a of the first upper end joint plate 121 and the outer surface 122a of the second upper end joint plate 122 approach from the positioning completed state shown in FIG. By relatively moving 122, as shown in FIG. 13C, the first male mold in the second top end joint plate 122 is moved to the first opening 1212A corresponding to the first female connection portion 40A of the first top end joint plate 121. The first male locking member 51A of the connecting portion 50A is the second opening hole 1212B corresponding to the second female connecting portion 40B of the first top end joint plate 121, and the second in the second top end joint plate 122 The second male locking members 51B of the male coupling portion 50B are respectively inserted. As a result, the first female connector 40A and the first male connector 50A, and the second female connector 40B and the second male connector 50B can be connected, respectively. Thus, the left top joint support plate 121 and the second top end joint plate 122 are joined in a surface contact state (normal contact state), and are connected by the left division support 10L and the right division support 10R mutually connected. An arched tunnel support 10 is formed.

FIG. 14 is a cross-sectional view of the second top end joint plate 122 with respect to the first female connecting portion 40A of the first top end joint plate 121 when the left split support 10L and the right split support 10R according to the first embodiment are connected. It is a figure explaining the condition where incorrect connection of 2 male type connection parts 50B is deterred. The planar positional relationship of the 1st top end joint board 121 and the 2nd top end joint board 122 is shown in the upper stage of Drawing 14, and the separation position relation of the 1st top end joint board 121 and the 2nd top end joint board 122 is shown in the lower stage. Indicates In the state shown in FIG. 14, a state is shown in which the planar positions of the first female connecting portion 40A and the second male connecting portion 50B coincide with each other. For example, it is not easy to perform the hand operation of the elector device 100 with high accuracy, and when the first top end joint plate 121 and the second top end joint plate 122 are joined, the state shown in FIG. I think enough. When the second male connection portion 50B is incorrectly inserted and locked with respect to the first female connection portion 40A, if the second connection portion 50B is incorrectly connected to the first male connection portion 50A After dismounting from the female connection portion 40A, the connection work of the left divided support 10L and the right divided support 10R has to be performed again, resulting in inconveniences such as an increase in useless work load and a delay in the work process. There is a risk. In particular, when the male locking member 51 is inserted into the female connection portion 40, the connection structure 30 in the present embodiment is locked by one-touch operation, and thus the above-mentioned inconvenience is likely to be manifested.

  On the other hand, in the connection structure 30 according to the present embodiment, as described above, the diameter (outer diameter) Do2 of the second male locking member 51B in the second male connection portion 50B is the first female connection portion. The dimension is set to be larger than the diameter (inner diameter) Di1 of the first insertion port 48A at 40A. Therefore, even if the second top end joint plate 122 tries to approach the first top end joint plate 121 from the state shown in FIG. 14, the second male locking member 51B in the second male coupling portion 50B is It is not inserted into the storage chamber 42 of the first female connection portion 40A through the first insertion port 48A. Therefore, the second male locking member 51B in the second male connection portion 50B of the second top end joint plate 122 is mistakenly inserted and engaged with the first female connection portion 40A of the first top end joint plate 121. It is possible to suppress the false connection that is stopped.

  As described above, according to the connection structure 30 in the present embodiment, the side edge guide plate 1213 and the upper edge guide plate are easily suppressed while the misassembly of the second male connection portion 50B to the first female connection portion 40A is easily suppressed. The normal connection is achieved by guiding the first male connection unit 50A and the second male connection unit 50B to the first female connection unit 40A and the second female connection unit 40B which are regular connection targets by 1214, respectively. Connection of parts can be easily realized. As a result, it is possible to suppress the occurrence of inconveniences such as an increase in useless work load and a delay in the work process due to the incorrect connection of the male connection portion 50 to the female connection portion 40.

  In the present embodiment, when the left split support 10L and the right split support 10R are connected, the driving operation of the hands 18L and 18R is the target 9 attached to the left split support 10L and the right split support 10R. You may carry out based on the survey data obtained by surveying a position from a coordinate known point.

  For example, the elector controller 102 wirelessly operates the total station 300 via the total station controller 400 to automatically track each target 9 (the first target 9 a to the fourth target 9 d), and sequentially surveys the coordinates of each target 9 Do. Here, the total station 300 is installed at a coordinate known point (x0, y0, z0). As described above, the laser light is irradiated from the total station 300 installed at the known coordinate point, and each target 9 is collimated to perform ranging and angle measurement, whereby the position coordinates of the first target 9a to the fourth target 9d ( x1, y1, z1), (x2, y2, z2), (x3, y3, z3), and (x4, y4, z4) can be obtained. Then, the survey data including the position coordinates of each target 9 is sequentially wirelessly transmitted from the total station controller 400 side to the elector controller 102. The elector controller 102 sets the respective drive amounts for relatively moving the hands 18L and 18R based on the survey data of each target 9 acquired from the total station 300, and as described above, the first of the left divided support 10L The top end joint plate 121 and the second top end joint plate 122 of the right divided support 10R can be integrally joined.

The movement amounts of the hands 18L and 18R set by the elector controller 102 are displayed on the monitor 101. The total station 300 in the present embodiment can automatically track and collimate each target 9. Therefore, the amount of movement of each hand 18L, 18R necessary for interconnecting the top ends of the left divided support 10L and the right divided support 10R by the operation of the hands 18L, 18R is displayed on the monitor 101 in real time. The operator can easily connect the left split support 10L and the right split support 10R by sequentially operating the operation panel 104 while looking at the monitor 101. The operation of the hands 18L and 18R referred to herein includes operating the drive mechanisms of the hands 18L and 18R to directly operate the hands 18L and 18R, as well as the boom 17L to which the hands 18L and 18R are attached. , 17R, and indirectly operating the hands 18L and 18R.

  After erecting the tunnel support 10 in an arch shape as described above, the Electr apparatus 100 places the tunnel support 10 at a predetermined erected position near the face 8 by driving the hands 18L and 18R (support Construction process). For example, the elector controller 102 may position each of the first target 9a to the fourth target 9d based on survey data including the coordinate position of each target 9 (the first target 9a to the fourth target 9d) acquired from the total station 300. May be displayed on the monitor 101. In addition to the respective positions of the first target 9a to the fourth target 9d, the target positions of the first target 9a to the fourth target 9d may be displayed on the monitor 101 together. The operator operating the elector apparatus 100 can arrange the tunnel support 10 at the regular erected position by driving the booms 17L and 17R and the hands 18L and 18R while looking at the monitor 101.

  Here, after the tunnel supports 10 (left split support 10L and right split support 10R) are arranged at predetermined erected positions in the face 8, the tunnel supports 10 (left With the split support 10L and the right split support 10R held (held), the leg 111d of the left split support 10L and the leg 112d of the right split support 10R from the spray nozzle 603 of the blowing device 600 1) The tunnel support 10 is temporarily fixed to the tunnel pit wall surface by spraying secondary shot concrete against the tunnel pit wall surface (primary shot concrete layer 3) and its periphery (temporary fixing process) ).

  After temporarily fixing the tunnel support 10 to the tunnel pit wall surface as described above, the holding of the tunnel support 10 by the hands 18L and 18R of the elector device 100 is released (grip releasing step). Then, next, secondary blowing concrete is sprayed between the newly established tunnel support 10 and the existing tunnel support 10 (newly installed section) adjacent in the axial direction of the tunnel T, and the new tunnel support 10 By embedding the entire area in the longitudinal direction in the secondary shot concrete, the new tunnel support 10 is fixed to the tunnel pit wall surface (first shot concrete layer 3) (spraying step). As a result, a secondary shot concrete layer 6 having a predetermined thickness is formed on the inner hollow side of the primary shot concrete layer 3. In the blowing step, the secondary blowing concrete is sprayed to a thickness that substantially reaches the inner air-side flanges 111 c and 112 c in the tunnel support 10. Next, a rock bolt passes through the secondary shot concrete layer 6 and the primary shot concrete layer 3 and is cast on the ground 7, one cycle of construction of the tunnel T is completed.

As described above, according to the method of constructing the tunnel T in the present embodiment, while holding the left split support 10L and the right split support 10R on the pair of hands 18L and 18R in the elector device 100, the hands 18L and 18R are held. By driving, the female connection portion 40 recessed in the first top end joint plate 121 and the male connection portion 50 protruding in the second top end joint plate 122 are engaged, and the left divided support 10L is produced. And the top end joint plate of the right divided support 10R can be connected in an arched manner. According to this, as in the prior art, personnel are arranged on a work scaffold assembled in the vicinity of the face face, mancage of the Electa device, etc. and moved to the vicinity of the tunnel top end to the top end of the pair of steel supports. Since it is not necessary to perform manual work near the face such as fastening the joint plates located by bolts and nuts, the safety and the workability can be improved more than before. Further, according to the connection structure 30 of the tunnel support 10 in the present embodiment, the female connection can be achieved only by the operation of inserting the male connection portion 50 (male locking member 51) from the insertion port 48 of the female connection portion 40. Since the male connection portion 50 can be engaged with the mold connection portion 40, the connection work of the left divided support 10L and the right divided support 10R can be easily performed in a short time.

  Further, according to the method of constructing the tunnel T in the present embodiment, blowing is performed in a state where the left split support 10L and the right split support 10R are gripped by the pair of hands 18L and 18R of the elector device 100 mounted on the work vehicle 200. Since the left split support 10L and the right split support 10R can be temporarily fixed in the normal erection position by spraying the blowing concrete from the spray nozzle 603 of the setting device 600, the tunnel T The step of connecting the axially adjacent tunnel supports 10 with each other by the connecting material can be omitted. According to this, since it is not necessary to arrange personnel on work scaffolding assembled in the vicinity of the face face or mancage of the Electa device, etc., and perform installation work of the connecting material, safety and construction of the tunnel T can be improved more than before. It can be improved.

  Furthermore, in the present embodiment, as shown in FIG. 10, the tip end portion 51d of the male locking member 51 is formed with a tapered surface 51e which is reduced in diameter toward the tip end. Therefore, in the support connecting step of connecting the left divided support 10L and the right divided support 10R (the female connecting portion 40 and the male connecting portion 50), the insertion port 48 of the female connecting portion 40 (first Even if the central positions of the insertion port 48A, the second insertion port 48B) and the male locking member 51 are somewhat shifted relatively, the opening hole 1212 of the first top end joint plate 121 (first opening hole 1212A, the first opening hole 1212A) By sliding the tapered surface 51e of the male locking member 51 along the edge of the two opening hole 1212B), the insertion port 48 (first insertion port 48A, second insertion port 48B) in the female connection portion 40 Also, the male locking member 51 can be guided in the direction in which the amount of positional deviation between the centers of the male locking members 51 decreases. That is, when the left split support 10L and the right split support 10R (the female connecting portion 40 and the male connecting portion 50) are connected by providing the tapered surface 51e at the front end portion 51d of the male locking member 51. Even if the planar positions of the insertion port 48 (first insertion port 48A, second insertion port 48B) of the female connecting portion 40 and the male locking member 51 are slightly shifted, the male locking member 51 can be used as a female connecting portion It can be smoothly led to the 40 insertion openings 48 (first insertion opening 48A, second insertion opening 48B). The detail of the tapered surface 51e formed on the end portion 51d of the male locking member 51 can be changed as appropriate. For example, the tip end portion 51d of the male locking member 51 may be formed in a conical shape. In this case, the conical side surface is formed as a tapered surface 51e.

<Modification>
FIG. 15 is a diagram for explaining a connection structure 30 according to a modification of the first embodiment. The opening holes 1212 (the first opening holes 1212A and the second opening holes 1212B) formed in the first top end joint plate 121 according to the present modification are formed from the inner surface 121b in the thickness direction of the first top end joint plate 121 It has a tapered surface 1215 which is expanded in diameter to 121a. By forming such a tapered surface 1215, when connecting the left divided support 10L and the right divided support 10R (female connection 40 and male connection 50), the insertion port of the female connection 40 Even if the center position of the male locking member 51 is somewhat shifted relative to the first insertion port 48A and the second insertion port 48B, the opening hole 1212 of the first top end joint plate 121 (first opening When the male locking member 51 slides on the tapered surface 1215 in the hole 1212A and the second opening hole 1212B), the insertion port 48 (first insertion port 48A and second insertion port 48B) in the female connection portion 40 The male locking member 51 can be guided in the direction in which the amount of positional deviation between the centers of the male locking members 51 decreases. According to this, the male locking member 51 can be smoothly guided to the insertion port 48 of the female connection portion 40.

  As mentioned above, although embodiment and modification of this invention were described, the connection structure of the division | segmentation support work which concerns on this invention is not restricted to these, It is possible to combine these as much as possible.

1 ··· Tunnel support structure 3 ··· Primary blast concrete layer 6 ··· Secondary blast concrete layer 7 ··· Area 7 ··· Face 10 ··· Tunnel support 10 L ··· Left split Support structure 10R: right divided support 40: female connection 40A: first female connection 40B: second female connection 50: male connection 50A: First male connecting portion 50B second male connecting portion 51 male locking member 121 first upper end joint plate 122 second upper end joint plate

Claims (4)

A connecting structure for connecting a pair of arc-shaped divided supports, forming an arched tunnel support erected along a tunnel pit wall, comprising:
A first upper end joint plate and a second upper end joint plate respectively provided at the top ends of the pair of divided supports and brought into contact with each other when the pair of divided supports are connected;
A first female connecting portion and a second female connecting portion recessed in the first top end joint plate;
A first male connecting portion and a second male connecting portion convexly provided on the second top end joint plate;
Equipped with
In the first upper end joint plate and the second upper end joint plate, the first male connecting portion is connected to the first female connecting portion, and the second male end is connected to the second female connecting portion. The connection portion is connected to join in a predetermined regular contact state,
The first female connection portion has a first insertion port into which the first male connection portion can be inserted,
The second female connection portion has a second insertion port into which the second male connection portion can be inserted,
The diameter of the first insertion opening is smaller than the diameter of the second insertion opening,
The diameter of the first male connection portion is smaller than the diameter of the second male connection portion and the diameter of the first insertion port,
The diameter of the second male connection portion is larger than the diameter of the first insertion port and smaller than the diameter of the second insertion port.
Connection structure of split support. The first female connecting portion and the second female connecting portion are recessed in parallel in the lateral width direction of the first top end joint plate,
The first male connecting portion and the second male connecting portion are provided in a convex shape in parallel in the lateral width direction of the second top end joint plate,
At the side edge of the first top end joint plate located on the side of the second female connection portion, a side edge guide plate protrudes in a direction away from the outer surface of the first top end joint plate in the vertical direction Has been
When connecting the pair of divided supports, a side edge of the second top end joint plate located on the second male connection portion side abuts on the side edge guide plate, whereby the first female die is connected. The lateral position of the first male coupling portion with respect to the coupling portion and the lateral position of the second male coupling portion with respect to the second female coupling portion are matched.
The connection structure of the split support according to claim 1. An upper edge guide plate protrudes from the upper edge of the first upper end joint plate in a direction away from the outer surface of the first upper end joint plate in the vertical direction,
When connecting the pair of divided supports, the upper edge of the second top end joint plate abuts on the upper edge guide plate, whereby the first male connection portion to the first female connection portion is The height position and the height position of the second male connection portion with respect to the second female connection portion are aligned,
The connection structure of the split support according to claim 1 or 2. Each of the first male connection portion and the second male connection portion has a rod-shaped male locking member protruding from the second top end joint plate,
The first female connection portion includes a casing having a storage chamber in which the first insertion port is formed, and the male locking member inserted into the storage chamber from the first insertion port is locked. And
The second female connection portion includes a casing having a storage chamber in which the second insertion port is formed, and locks the male locking member inserted into the storage chamber from the second insertion port. Do,
The connection structure of the division support according to any one of claims 1 to 3.

Images