JP2019002277A - Tunnel support erection method and erection system - Google Patents

Abstract

To provide a tunnel support erection method and erection system capable of improving safety and workability while avoiding manual work on a pit face when erecting a tunnel support.SOLUTION: A tunnel support erection method for erecting an arch-shaped support configured by mutually coupling a pair of divided supports divided into an arcuate shape in upper ends on a pit face includes a support coupling step for coupling the pair of divided supports in the arch shape by disposing an erector device on the pit face, one upper end of the pair of divided supports including a recessed coupling part that can be engaged with a projected coupling part formed in the other upper end and the erector device including a pair of hands for crimping the pair of divided supports in a removable manner, and engaging the projected coupling part to the recessed coupling part by relatively moving the pair of hands in a state in which the pair of divided supports are crimped.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a tunnel support construction method and a construction system.

As a construction method for constructing a tunnel, a NATM construction method (New Austrian Tunneling Method) is known. The NATM method uses appropriate support materials such as shotcrete, rock bolts, steel support, etc., based on the concept of maintaining the stability of the tunnel by effectively using the support capacity and strength of natural ground. It is a construction method that constructs a tunnel structure integrated with natural ground.

  When constructing a tunnel in the NATM construction method, when an arch-shaped tunnel support is installed, it is usually performed according to the procedure described below. First, a spraying machine is set in the vicinity of the face, the concrete is first sprayed on the face, and when this is completed, the sprayer is withdrawn. Next, a work vehicle equipped with an erector for building a support work in the vicinity of the face is set, and an arch-shaped tunnel support work is built on the face by the erector, and when this is completed, the work vehicle is withdrawn. Next, set the sprayer on the face again, embed the built tunnel support, perform secondary spraying of concrete, and then exit the sprayer.

  As a technique for accurately building a tunnel support work in the NATM method, a pair of targets are installed on a work vehicle, each is collimated with a laser rangefinder from a known coordinate point, the target coordinate value is obtained, and the support work is installed. An installation method for installing at coordinate values has been proposed (see, for example, Patent Document 1).

  In addition, an installation method has been proposed in which targets are attached to the left, right, and upper center of the support work, the target is automatically tracked by a total station, and the support work is adjusted to a design value by an erector device (for example, , See Patent Document 2).

Japanese Patent No. 3381606 Japanese Patent No. 4559346 Japanese Patent No. 5720041

  Usually, tunnel support works are built in an arch shape by installing a pair of support works divided into arcs on the face and then connecting the upper ends of the pair of support works to each other via bolts etc. Although it is formed, the actual situation is that the fastening operation of the bolt is a manual operation.

  The present invention has been made in view of the above-described problems, and its purpose is to avoid manual work at the face when building a tunnel support, and to improve safety and workability. It is to provide a method and a system for building a tunnel support that can be used.

The present invention relates to a tunnel support erection method in which an arch-shaped support constructed by connecting a pair of divided support works divided in an arc shape to each other at the upper end, and the pair of split support works. A pair of hands for detachably gripping the pair of split support members, wherein one of the upper ends is provided with a concave connection portion that can be engaged with a convex connection portion formed on the other upper end portion. The pair of hands is in a state of gripping the pair of split support members, and the pair of hands is engaged with the concave connection portion. It has the support work connection process which connects a division | segmentation support work in an arch shape.

  By adopting the above configuration, a pair of split supports is provided by engaging the convex connection part with the concave connection part by hand operation of the erector device without manually tightening bolts and nuts near the face. Works can be connected to each other. As a result, it is possible to improve safety and workability when building a tunnel support work.

  Further, the present invention relates to a relative movement of the pair of hands based on survey data obtained by surveying the position of the target attached to each of the pair of split supporters from a known coordinate point in the support connection step. It is good also as a structure made to do. Thus, by setting the relative movement amount of the hand, the pair of divided support works can be more efficiently connected by the hand operation.

  Further, in the present invention, the erector device is mounted on a work vehicle including a spraying device that sprays concrete onto the face, and the pair of divided support works are connected in an arch shape, and then placed in a predetermined erected position. The step of arranging the arch-shaped supporter and the arch-shaped supporter by spraying concrete with the spraying device in a state where the arch-shaped supporter arranged at the built-in position is gripped by the hand. It is good also as a structure which further has the process of canceling | releasing the holding | grip of the said support work by the said hand after temporarily fixing. According to this, it is only necessary to move, set, and leave the work vehicle once, and congestion of heavy machinery can be avoided. In addition, in a series of operations such as excavation, primary spraying, support construction, and secondary spraying, since the worker can proceed without entering the face, the safety of the work is remarkably improved.

  Note that the present invention can also be understood as a tunnel support construction system. That is, the present invention relates to a tunnel support erection system in which an arch-shaped support constructed by connecting a pair of divided support works divided into arcs to each other at the upper end, and the pair of split support works. Including an erector apparatus having a pair of hands for detachably holding a work, and a concave mold that can be engaged with a convex coupling portion formed on the other upper end at one upper end of the pair of split support works A connecting portion is provided, and the erector device moves the pair of hands in a state of gripping the pair of split support members in a state of being arranged on the face, and moves the pair of hands to the concave connecting portion. The pair of split support works are connected in an arch shape by engaging a connecting portion. By adopting such a configuration, the same effects as described in the embedding method can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, when building a tunnel support work, the construction method and system of a tunnel support work which can avoid the manual work in a face and can improve safety | security and workability | operativity can be provided.

FIG. 1 is a schematic configuration diagram of a tunnel support construction system according to an embodiment. FIG. 2 is a top view of the work vehicle according to the embodiment. FIG. 3 is a side view of the work vehicle according to the embodiment. FIG. 4 is a diagram illustrating a position where the target is attached to the support according to the embodiment. FIG. 5 is a diagram illustrating a target according to the embodiment. Drawing 6 is a figure explaining the connection structure of the division support work on either side concerning an embodiment. FIG. 7 is a diagram illustrating a procedure of connecting the left divided support work and the right divided support work according to the embodiment.

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

<Embodiment>
FIG. 1 is a schematic configuration diagram of a tunnel support erection system S according to the embodiment. In the figure, reference numeral 1 denotes an erector apparatus for laying a support work, and reference numeral 2 denotes a work vehicle on which the erector apparatus 1 is mounted and which can be self-propelled. Reference numeral 3 is an automatic tracking type total station which is a distance measuring / angle measuring instrument (surveying instrument) using laser light, reference numeral 4 is a total station controller for controlling the total station 3, and reference numeral 5 is a total station side capable of wireless transmission and reception with the total station controller 4. It is an antenna.

  The erector apparatus 1 includes a monitor 11, which is a display device mounted on a cockpit, an erector controller 12, an erector-side antenna 13, an operation panel 14, a keyboard 15, a ponting device 16, and the like. Moreover, the code | symbol 6 in a figure is an arch-shaped steel support (henceforth "arch-shaped support"). As will be described in detail later, the arch-shaped support 6 is formed by connecting a pair of split support 6L, 6R divided in an arc shape to each other at the center. The “central part” here refers to the central part of the arch-shaped support 6 and the upper ends of the pair of split supports 6L and 6R are connected to each other.

  The total station 3 is a surveying instrument that measures (measures) the position of a target by automatically tracking a target 7 including a prism or the like by irradiating a laser beam, and measuring its distance and angle. Is installed at a known point (coordinate known point). In this embodiment, the target 7 is attached to the support built in the face, and the target 7 is automatically tracked as the divided support 6L, 6R (arch-shaped support 6) is moved. It is recommended to select a place where there is no obstacle in collimation. For example, it may be installed on a tunnel floor, or a frame may be installed on the ceiling, and the total station 3 may be installed on the frame.

  The total station controller 4 includes, for example, a portable computer. The total station controller 4 automatically controls various mechanisms of the total station 3 by software installed in a computer and processes survey data of the total station 3. Further, the total station controller 4 can transmit and receive data by wireless communication with the erector controller 12 side, and can wirelessly operate various mechanisms of the total station 3 by commands from the erector controller 12 side. .

  FIG. 2 is a top view of the work vehicle 2 according to the present embodiment. FIG. 3 is a side view of the work vehicle 2 according to the present embodiment. The work vehicle 2 includes an erector device 1 and a spraying device 10. The erector apparatus 1 includes a pair of booms 17L and 17R having the same configuration. The pair of booms 17L and 17R can be freely expanded / contracted, tilted, oscillated, and rotated by operation of a drive mechanism attached thereto. In addition, 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 a drive mechanism attached thereto, and can detachably hold (hold) the pair of split supporters 6L and 6R. it can.

Hereinafter, the boom indicated by reference numeral 17L is referred to as a “left boom”, and the boom indicated by reference numeral 17R is referred to as a “right boom”. A hand indicated by reference numeral 18L is referred to as a “left hand”, and a hand indicated by reference numeral 18R is referred to as a “right hand”. Further, the divided support shown by reference numeral 6L is referred to as "left divided support", and the divided support shown by reference 6R is called "right divided support". The erector apparatus 1 can detachably hold the left split support 6L on the left hand 18L and can detachably hold the right split support 6R on the right hand 18R. In the present embodiment, the left and right divided supporters 6L and 6R are a pair of supporters in which an arch-shaped H-shaped steel is divided into two, and after being guided in the vicinity of the face, they are assembled with the face and assembled into an arch shape. An arched support 6 is formed. The left and right divided supporters 6L and 6R are united by being connected to each other at their upper ends.

  FIG. 4 is a diagram illustrating a position where the target is attached to the support according to the embodiment. As shown in FIG. 4, the left and right divided supporters 6 </ b> L and 6 </ b> R have a symmetrical arc shape. Here, the left divided support 6L has the first target 7a and the second target 7b attached to the upper end 6La and the lower end 6Lb, respectively. The right split support 6R has a third target 7c and a fourth target 7d attached to the upper end 6Ra and the lower end 6Rb, respectively. Here, the first target 7a to the fourth target 7d are collectively referred to as “target 7”. FIG. 5 is a diagram illustrating the target 7 according to the embodiment. The target 7 includes a magnet 72 provided at the base end portion of the holder 71 and a prism 73 provided at the tip of the holder 71. Since the left and right split supporters 6L and 6R are made of steel, the target 7 can be detachably attached to the split supporters 6L and 6R by the magnetic force of the magnet 72 provided at the base end of the holder 71.

  Moreover, in the example shown in FIG. 4, the target 7 is attached to the inner peripheral surface of the left and right divided supporters 6L and 6R. In the present embodiment, marks for attaching the first target 7a and the second target 7b to the inner peripheral surfaces of the upper end portion 6La and the lower end portion 6Lb in the left divided support 6L are marked in advance with paint or the like. Similarly, marks for attaching the third target 4c and the fourth target 7d are marked in advance with paint or the like on the inner peripheral surfaces of the upper end 6Ra and the lower end 6Rb of the right divided support 6R. Further, in the state where each target 7 is attached to the inner peripheral surfaces of the left and right divided supporters 6L and 6R, the height Hp from the inner peripheral surface to the center of the prism 73 is constant.

  Next, the spraying device 10 will be described with reference to FIGS. 2 and 3. The spraying device 10 is disposed between the left boom 17L and the right boom 17R, and includes an arm 101, a spraying robot 102 supported by the arm 101, and a spraying provided on the tip side of the spraying robot 102. A nozzle 103 and the like are provided. The arm 101 can be expanded and contracted, tilted, and the like. Further, the spraying robot 102 can tilt and rotate the spray nozzle 103. In addition, the spraying device 10 includes a concrete pump, a quick setting agent supply device, a compressor, a high-pressure water pump, and the like. The spraying robot 102 can spray concrete onto the face by discharging spraying concrete (hereinafter simply referred to as “concrete”) supplied from the concrete pump from the spray nozzle 103.

Next, a method for installing a support work in this embodiment will be described. The NATM method consists of (1) blasting the face or excavating it with a machine → (2) Unloading the sludge → (3) Primary spraying of concrete → (4) Construction of support works → (5) Secondary spraying of concrete → (6) The tunnel is extended in the axial direction by repeating the driving of the lock bolt as one cycle. In the present embodiment, (2) after completion of the slip-out process, the work vehicle 2 is set near the face. At that time, each work hand 18L, 18R of the erector apparatus 1 causes the work vehicle 2 to self-run while holding the left divided support 6L and the right divided support 6R along the tunnel axis (tunnel extending direction). Set near the face. And primary spraying which sprays concrete using the spraying apparatus 10 is performed to the face which builds the left split support work 6L and the right split support work 6R from now on. Note that this primary spraying may be omitted when the face is in good condition.

  Next, the left split support 6L and the right split support 6R are built. FIG. 6 is a diagram for explaining a connection (connection) structure of the left and right divided supporters 6L and 6R. In the present embodiment, one upper end of the left divided support 6L and the right divided support 6R is provided with a concave connection that can be connected to the convex connection formed on the other upper end. Hereinafter, with reference to FIG. 6, the detail of the connection structure of the division | segmentation support work 6L and 6R is demonstrated.

  Fig.6 (a) is a figure which shows the side surface by the side of the upper end part of division | segmentation support work 6L, 6R. A flat plate-like joining plate 61 orthogonal to the H-shaped cross section is provided at the upper end of each of the divided supporters 6L and 6R. FIG. 6A shows a state where the joining plates 61 of the divided supporters 6L and 6R face each other and are separated from each other. Moreover, the code | symbol 62 in a figure is a web in each division | segmentation support work 6L, 6R, and the codes | symbols 63a and 63b are a pair of flange in each division | segmentation support work 6L, 6R. The flange indicated by reference numeral 63a is referred to as an “upper flange”, and the flange indicated by reference numeral 63b is referred to as a “lower flange”. The joining plate 61 is provided so as to be orthogonal to the web 62 and the pair of flanges 63a and 63b. Reference numeral 611 indicates the outer surface of the bonding plate 61, and reference numeral 612 indicates the inner surface of the bonding plate 61. The joining plate 61 is connected to the inner surface 612 side by an H-shaped steel made up of an upper flange 63a, a lower flange 63b, and a web 62.

  FIG. 6B is a front view of the joining plate 61 of the left split support 6L. FIG. 6C is a front view of the joining plate 61 of the right split support work 6R. Hereinafter, the joining plate 61 of the left divided support 6L is also referred to as “first joining plate 61L”, and the joining plate 61 of the right divided support 6R is also referred to as “second joining plate 61R”. FIG. 6B illustrates a state where the first joining plate 61L is viewed from the outer surface 611 side. FIG. 6C illustrates a state where the second joining plate 61R is viewed from the outer surface 611 side.

  Referring to FIG. 6B, the first joining plate 61L is provided with concave connecting portions 8a and 8b which are a pair of through holes penetrating the first joining plate 61L in the thickness direction. The concave connecting portions 8a and 8b are through-holes having the same structure, and each include an insertion / extraction hole portion 80 and a locking hole portion 81 communicating with the insertion / extraction hole portion 80. The insertion / extraction hole 80 of the concave coupling parts 8a, 8b is a circular hole. The locking hole 81 is a long hole having a width smaller than the diameter of the insertion / extraction hole 80, and the major axis direction of the locking hole 81 extends parallel to the web 62. The pair of concave coupling portions 8a and 8b drilled in the first joining plate 61L are disposed at symmetrical positions with the web 62 interposed therebetween. Further, the insertion / extraction hole 80 of the concave coupling portions 8a and 8b is provided at a position closer to the upper flange 63a than the lower flange 63b of the first joining plate 61L.

  On the other hand, as shown in FIG.6 (c), the convex connection parts 9a and 9b which are a pair of protrusion are protrudingly provided by the 2nd joining plate 61R of the right side split support 6R. The convex connection portions 9a and 9b can be engaged with a pair of concave connection portions 8a and 8b provided on the first joining plate 61L of the right split support 6R. Referring to the enlarged view shown in FIG. 6 (c) and FIG. 6 (a) together, the convex connecting portions 9a and 9b are provided at the shaft portion 90 standing on the joining plate 61 and at the tip of the shaft portion 90. And a conical locking portion 91 provided. The shaft portion 90 is a rod-shaped member having a circular cross section. The diameter of the shaft 90 in the circular cross section is set to a size smaller than the width of the locking hole 81 of the concave coupling portions 8a and 8b provided in the first joining plate 61L. The locking portion 91 has a circular bottom surface 91 a that is orthogonal to the axial direction of the shaft portion 90.

Here, the diameter of the bottom surface 91a of the locking portion 91 is larger than the width of the locking hole portion 81 in the concave coupling portions 8a and 8b provided in the first joining plate 61L, and the diameter of the insertion / extraction hole portion 80 is increased. The dimension is set smaller than the diameter. In addition, the pair of convex coupling portions 9 a and 9 b in the second joining plate 61 </ b> R are disposed at symmetrical positions with the web 62 interposed therebetween. Further, the distance between the axial center of the shaft portion 90 and the central axis of the web 62 in each of the convex connection portions 9a and 9b of the second bonding plate 61R is the respective concave connection portions 8a and 8b of the first bonding plate 61L. The distance between the major axis of the locking hole 81 and the center axis of the web 62 is the same as that in FIG. Further, the convex coupling portions 9a and 9b are provided at positions closer to the lower flange 63b than to the upper flange 63a of the second joining plate 61R.

  When the arch support 6 is installed, the erector apparatus 1 extends and tilts the left boom 17L and the right boom 17R, and rotates the left hand 18L and the right hand 18R, thereby dividing the left split support 6L and the right split. The support 6R is moved so as to be orthogonal to the tunnel axis. The booms 17L and 17R and the hands 18L and 18R in the erector apparatus 1 can be driven by operating the operation panel 14.

  Next, the pair of hands 18L and 18R in a state of gripping the left divided support 6L and the right divided support 6R are relatively moved, and the concave connection portion provided on the first joining plate 61L of the left divided support 6L. 8a and 8b are respectively engaged with convex connecting portions 9a and 9b provided on the second joining plate 61R of the right split support 6R, and the left split support 6L and the right split support 6R are connected in an arch shape. By doing so, the arch support 6 is formed. At that time, the relative movement amounts of the hands 18L and 18R are set based on the survey data obtained by surveying the positions of the targets 7 attached to the left split support 6L and the right split support 6R from the coordinate known points. Drive. In the present embodiment, the concave connection portions 8a and 8b provided on the first bonding plate 61L and the convex connection portions 9a and 9b provided on the second bonding plate 61R are one-touch by a hand operation of the erector apparatus 1. It functions as a one-touch joint connected with

  For example, the erector controller 12 wirelessly operates the total station 3 via the total station controller 4, automatically tracks each target 7 (first target 7a to fourth target 7d), and sequentially automatically coordinates the coordinates of each target 7. To do. Here, the total station 3 is installed at a coordinate known point (x0, y0, z0). In this way, by irradiating the laser beam from the total station 3 installed at the coordinate known point and collimating each target 7 to perform distance measurement and angle measurement, the position coordinates of the first target 7a to the fourth target 7d ( x1, y1, z1), (x2, y2, z2), (x3, y3, z3), (x4, y4, z4) can be obtained. The survey data including the position coordinates of each target 7 is sequentially wirelessly transmitted from the total station controller 4 side to the erector controller 12. The erector controller 12 sets respective driving amounts for moving the hands 18L and 18R relative to each other based on the survey data of each target 7 acquired from the total station 3, and the procedure shown in FIGS. 7 (a) to 7 (c). Then, the first joining plate 61L of the left divided support 6L and the second joining plate 61R of the right divided support 6R are connected to each other.

Note that the movement amounts of the hands 18L and 18R set by the erector controller 12 are displayed on the monitor 11. The total station 3 in this embodiment can automatically track and collimate each target 7. Therefore, the amount of movement of each hand 18L, 18R required to interconnect the upper ends of the left divided support 6L and the right divided support 6R by operating the hands 18L, 18R is displayed on the monitor 11 in real time. The operator can easily connect the left divided support 6L and the right divided support 6R by sequentially operating the operation panel 14 while looking at the monitor 11. In addition, the operation of the hands 18L and 18R referred to here includes operating the driving mechanisms of the hands 18L and 18R to directly operate the hands 18L and 18R, and the boom 17L to which the hands 18L and 18R are attached. , 17R
Indirect operation of the hands 18L and 18R by driving is also included.

  FIG. 7 is a diagram illustrating a procedure of connecting the left divided support 6L and the right divided support 6R. In the drawing, the left side shows the side surface on the upper end side of the divided supporters 6L and 6R, and the right column shows the concave connection portions 8a and 8b on the first bonding plate 61L side and the convex connection portion on the second bonding plate 61R side. The relative relationship with 9a, 9b is shown. The relative relationship between the concave connecting portions 8a and 8b and the convex connecting portions 9a and 9b shown on the right side of FIG. 7 is the first joining through the second joining plate 61R through the inner surface 612 side of the second joining plate 61R. The relative relationship between the concave coupling portions 8a and 8b and the convex coupling portions 9a and 9b is shown with reference to the case where the plate 61L is viewed.

  In the state shown in FIG. 7A, the first joining plate 61L of the right split support 6R and the second joining plate 61R of the left split support 6L are separated from each other as shown, and the right split support is provided. The work 6R is arranged at a slightly higher position than the left divided support work 6L. Specifically, the heights of the convex coupling portions 9a and 9b (the shaft portion 90 and the locking portion 91) provided on the second joining plate 61R are the concave coupling portions provided on the first joining plate 61L. Both heights are aligned so as to coincide with the height of the insertion / extraction hole 80 of 8a, 8b. Further, the positions of the left divided support 6L and the right divided support 6R in the tunnel axis direction coincide with each other. As a result, the insertion / extraction holes 80 of the concave connection portions 8a and 8b provided in the first bonding plate 61L and the convex connection portions 9a and 9b provided in the second bonding plate 61R are formed in the tunnel axis direction. The positions are matched to each other. Hereinafter, the state illustrated in FIG. 7A is referred to as a “connecting portion separation state”.

  Next, by operating (driving) at least one of the pair of hands 18L and 18R from the connecting portion separation state shown in FIG. 7A, the pair of split supporters 6L and 6R are relatively moved, and the left split support is left. While maintaining (fixing) the relative positional relationship between the height direction of the work 6L and the right split support work 6R and the tunnel axis direction, the left split support work 6L (first joining plate 61L) and the right split support work 6R (second The joining plate 61R) is relatively approached.

  At that time, the insertion / extraction hole 80 of the concave connecting portions 8a and 8b provided in the first joining plate 61L of the left divided support 6L and the convex shape provided in the second joining plate 61R of the right divided support 6R. Since the connecting portions 9a and 9b are aligned with each other, the concave connecting portion 8a on the left divided support 6L side can be obtained by bringing the first connecting plate 61L and the second connecting plate 61R closer as described above. , 8b, the convex connecting portions 9a, 9b on the right split support work 6R side are inserted into the insertion / extraction holes 80, and the state shifts to the state shown in FIG. 7 (b).

  In FIG. 7B, the convex connection portions 9a and 9b on the right split support work 6R side are inserted into the insertion / extraction holes 80 in the concave connection parts 8a and 8b on the left split support work 6L side, and The outer surfaces 611 of the first joining plate 61L and the second joining plate 61R are in contact with each other to show a state where the insertion of the convex coupling portions 9a and 9b into the insertion / extraction hole 80 is completed. Hereinafter, the state illustrated in FIG. 7B is referred to as a “connection portion insertion completion state”.

  After the pair of split supporters 6L and 6R is transitioned from the connection part separation state to the connection part insertion completion state, at least one of the pair of hands 18L and 18R is operated (driven), and the left split support work 6L and the right side The height of the divided support 6R is made to coincide. Here, in a state where the left divided support 6L is stationary, the right divided support 6R is slid vertically downward while the second joining plate 61R is slidably contacted with the first joining plate 61L.

Here, in the connection part insertion completion state shown in FIG.7 (b), the axial part 90 of the convex connection parts 9a and 9b in the right split support work 6R (second joining plate 61) is the left split support work 6L ( The first connecting plate 61L) is inserted through the insertion / extraction hole 80 of the concave coupling portions 8a and 8b. When the right split support 6R is slid vertically downward from this state, the shaft portions 90 of the convex connection portions 9a and 9b inserted through the insertion / extraction hole portions 80 of the concave connection portions 8a and 8b are removed from the insertion / removal hole portion 80. Then, it moves to the locking hole portion 81 communicating with this. In addition, since the diameter of the shaft part 90 in the convex connection parts 9 a and 9 b is smaller than the width of the locking hole part 81, the long axis that extends the shaft part 90 in the convex connection parts 9 a and 9 b in parallel with the web 62. It can be smoothly slid along the locking hole 81 having

  Here, the state shown in FIG. 7C is referred to as a “completion completed state”. In this connected state, the shaft portions 90 of the convex connecting portions 9a and 9b are positioned at the locking ends 81a of the locking holes 81 in the concave connecting portions 8a and 8b. The locking end 81a is the end of the locking hole 81 that is located on the side opposite to the insertion / extraction hole 80. In the present embodiment, the heights of the upper flanges 63a and the lower flanges 63b of the left divided support 6L and the lower flange 63b coincide with each other in the connection completion state shown in FIG. 7C. As described above, the length of the locking hole 81 in the major axis direction is defined.

  Moreover, the diameter of the latching | locking part 91 (bottom surface 91a) in the convex connection parts 9a and 9b is set to the dimension larger than the width | variety of the latching hole part 81 in the concave connection parts 8a and 8b. Therefore, in the state where the position of the shaft portion 90 in the convex coupling portions 9a and 9b is switched from the insertion / extraction hole portion 80 of the concave coupling portions 8a and 8b to the locking hole portion 81, the convex coupling portions 9a and 9b The locking portion 91 is locked to the back side of the first joining plate 61L, and the withdrawal of the convex coupling portions 9a, 9b from the concave coupling portions 8a, 8b is suppressed. That is, the movement in the direction in which the first joining plate 61L of the left divided support 6L and the second joining plate 61R of the right divided support 6R are separated is restricted. That is, in the connection completion state shown in FIG. 7C, the convex connection portions 9a and 9b (locking portions 91) in the second bonding plate 61 are engaged with the concave connection portions 8a and 8b in the first bonding plate 61L. By engaging with the stop hole 81, the upper ends of the left divided support 6L and the right divided support 6R are connected to each other. As a result, the arch support 6 can be assembled in an arch shape.

  In the present embodiment, each state shown in FIG. 7 is transitioned by operating (driving) at least one of the pair of hands 18L and 18R in a state of holding the left divided support 6L and the right divided support 6R. The left split support 6L and the right split support 6R are connected. Accordingly, when sequentially transitioning to the respective states shown in FIG. 7, both the pair of hands 18L and 18R may be driven, or the other of the pair of hands 18L and 18R may be driven while the other is stationary.

  After assembling the arch-shaped supporter 6 into an arch shape, the erector apparatus 1 builds the arch-shaped supporter 6 at a predetermined erected position on the face. For example, the erector controller 12 determines each position of the first target 7a to the fourth target 7d based on survey data including the coordinate position of each target 7 (first target 7a to fourth target 7d) acquired from the total station 3. May be displayed on the monitor 11. The monitor 11 may display the target positions of the first target 7a to the fourth target 7d in addition to the positions of the first target 7a to the fourth target 7d. An operator who operates the erector apparatus 1 can place the arch-shaped supporter 6 at a normal built-in position by driving the booms 17L and 17R and the hands 18L and 18R while looking at the monitor 11. The left hand 18L so that the relative positions of the left split support 6L and the right split support 6R do not change until the arch support 6 assembled in an arch shape is arranged at a predetermined erection position on the face. And the relative position of the right hand 18R. Thus, in the process until the arch-shaped support 6 is arranged at a predetermined erected position on the face, the convex connection portions 9a and 9b connecting the left divided support 6L and the right divided support 6R and the concave connection It can suppress that the engagement state with part 8a, 8b will be cancelled | released.

  After the arch-shaped support 6 is arranged at a predetermined position on the face, the spraying device 10 is operated in a state where the arch-shaped support 6 is held (held) by the hands 18L and 18R of the erector apparatus 1. Concrete is sprayed from the attachment nozzle 103 to the arch-shaped support 6 and the face, and secondary spray is performed to bury the arch-shaped support 6 in the concrete. Then, the concrete is hardened to some extent while the arch support 6 is gripped by the hands 18L and 18R, and the arch support 6 is temporarily fixed at a normal erected position. Then, after the arch support 6 is temporarily fixed, the gripping of the arch support 6 by the hands 18L and 18R is released. Then, when the gripping by the hands 18L and 18R is released, the secondary shotcrete is sprayed to the design position including the portion held by the hands 18L and 18R in the arch-shaped support 6 and the arch-shaped support 6 This completes the installation for one cycle.

  According to the tunnel support erection method and the erection system configured as described above, the concave connection portions 8a and 8b are formed on the first joining plate 61L provided at the upper end of the left split support erection 6L. The convex connecting portions 9a and 9b that can be engaged with the concave connecting portions 8a and 8b are formed on the second joining plate 61R provided at the upper end portion of the right split supporting work 6R connected to the left divided supporting work 6L. I tried to do it. When the arch support 6 is installed, the erector device 1 is disposed on the face, and at least one of the pair of hands 18L and 18R in a state of gripping the pair of split support 6L and 6R is operated. By making the relative movement, the convex connection portions 9a and 9b are engaged with the concave connection portions 8a and 8b, and the left divided support work 6L and the right divided support work 6R are connected in an arch shape.

  By adopting the above method, the left divided support 6L and the right side are connected via a one-touch joint that is engaged by the operation of the hands 18L and 18R without performing manual fastening work using bolts and nuts in the vicinity of the face. The divided support 6R can be connected. As a result, it is possible to improve safety and workability when building a tunnel support work. In the present embodiment, a one-touch joint is provided at each upper end of each of the divided supporters 6L and 6R, and the divided supporters 6L and 6R can be connected in an arch shape by hand operation of the erector apparatus 1 instead of manual work. The details of the concave coupling portions 8a and 8b and the convex coupling portions 9a and 9b are not limited to the structure shown in FIG. 6, and various modifications can be made.

  In addition, when connecting the left divided support 6L and the right divided support 6R in an arch shape, the total station in which the position of each target 7 attached to the left divided support 6L and the right divided support 6R is installed at a known coordinate point. The movement amount of the hands 18L and 18R is set based on the survey data obtained by surveying using No. 3, and the hands 18L and 18R are relatively moved based on the set movement amount. Thereby, the left split support 6L and the right split support 6R can be connected with high accuracy. Further, the movement amounts of the hands 18L and 18R set based on the survey data are displayed on the monitor 11 of the erector apparatus 1 in real time. According to this, the worker can easily perform appropriate operations of the hands 18L and 18R while looking at the monitor 11, and the connection work of the left divided support 6L and the right divided support 6R can be performed more efficiently. It can be carried out.

  Further, in the present embodiment, concrete is sprayed by the spraying device 10 while the arch-shaped supporter 6 disposed at the regular erected position is held by the hands 18L and 18R, and the arch-shaped supporter 6 is temporarily fixed. After that, the gripping of the arched support 6 by the hands 18L and 18R is released. According to this, the work vehicle 2 can be moved, set, and exited only once, and congestion of heavy machinery can be avoided. Further, it is not necessary to adjust the installation positions of the left divided support 6L and the right divided support 6R immediately before the face, so that work efficiency and safety are improved.

And in this embodiment, in a series of work of excavation, primary spraying, support construction, and secondary spraying, the worker can proceed without entering the face. Remarkably improved.

  Various modifications and improvements can be made to the above-described embodiment. For example, in the present embodiment, the target 7 has a structure including a holder 71 containing the magnet 72 and a prism 73 provided at the tip thereof, but is not limited thereto. For example, you may comprise the target 7 with the sheet-like sheet prism which can be affixed on the division | segmentation support work 6L and 6R. In that case, by producing the sheet prism with a magnetic sheet, the sheet prism can be easily attached to and detached from the divided supporters 6L and 6R, and the workability is good.

In the present embodiment, the positions of the divided supporters 6L and 6R are grasped by using a distance measuring / angle measuring instrument (surveying instrument) such as the total station 3 or the like, but the present invention is not limited to this. For example, GPS from positioning satellites used in GPS (Global Positioning System)
The GPS receiver that receives the signal may be replaced with the target 7 and attached to each of the divided supporters 6L and 6R. In this case, the erector controller 12 acquires the GPS signal received by each GPS receiver, thereby acquiring the position information of the part to which the GPS receiver is attached in the divided supporters 6L and 6R based on the GPS signal. Can do. Moreover, in this embodiment, as shown in FIG. 4, the target 7 is attached to the upper end 6La and the lower end 6Lb of the left split support 6L, and the target 7 is attached to the upper end 6Ra and the lower end 6Rb of the right split support 6R. However, the present invention is not limited to this, and the position and number of targets 7 to be attached can be changed as appropriate.

  As mentioned above, although embodiment of this invention was described, the construction method and construction system of the tunnel support work which concern on this invention are not restricted to these, These can be combined as much as possible.

S ... Built-in system 1 ... Electa device 2 ... Work vehicle 3 ... Total station 4 ... Total station controller 5 ... Total station side antenna 6 ... Arched steel support 6L, 6R: Divided support 7 ... Targets 8a, 8b ... Concave joints 9a, 9b ... Convex joint 10 ... Spraying device 103 ... Spray nozzle 11 ... Monitor 17L, 17R ... Booms 18L, 18R ... Hands 61L, 61R ... Joining plate 62 ... Web 63 ... Flange

Claims (6)

In the construction method of the tunnel support work in which an arch-shaped support work formed by connecting a pair of split support works divided into arcs to each other at the upper end is built in the face,
The upper end portion of one of the pair of split supports is provided with a concave connection portion that can be engaged with the convex connection portion formed on the other upper end portion,
An erector device having a pair of hands for detachably holding the pair of split support members is disposed on the face, and the pair of hands in a state of gripping the pair of split support members are moved relative to each other to form the concave connection part. Having a support connection step of connecting the pair of split support work in an arch shape by engaging the convex connection part with
The concave connecting portion communicates with the insertion / extraction hole portion provided in a rectangular first joining plate provided at one upper end portion of the pair of split support works, and the insertion / extraction hole. Including a locking hole extending from the portion,
The convex connection part is a vertical part provided vertically from a rectangular second bonding plate provided at the other upper end of the pair of split support works, and a shaft part having a circular cross section, Including a locking portion provided at the tip of the shaft portion,
The locking portion has a bottom surface orthogonal to the axial direction of the shaft portion,
A diameter of the shaft portion is smaller than a width of the locking hole portion;
The diameter of the bottom surface of the locking part is larger than the width of the locking hole part and smaller than the diameter of the insertion / extraction hole part,
A pair of the concave connection portions are provided on the first joining plate, and the pair of concave connection portions are arranged at symmetrical positions across the web in the divided support where the first joining plate is provided. Has been
A pair of the convex connection portions are provided on the second joining plate, and the pair of convex connection portions are symmetrically located with respect to the web in the divided support work provided with the second joining plate. Are located in
A major axis direction of the locking hole portion extends in a direction along a side edge of the first joining plate,
In the support connection step, when the shaft portion of the convex connection portion is in a connection completion state positioned at the engagement end of the engagement hole portion in the concave connection portion, the upper in the pair of divided support operations The length in the major axis direction of the locking hole portion is defined so that the heights of the flanges and the heights of the lower flanges match each other,
How to build a tunnel support. In the support connection step, the pair of hands are moved relative to each other based on survey data obtained by measuring the position of the target attached to the pair of split support from a coordinate known point,
The tunnel support construction method according to claim 1. The erector device is mounted on a work vehicle including a spraying device that sprays concrete onto the face,
The building method is
After connecting the pair of split support works in an arch shape, placing the arch support work in a predetermined building position;
In a state where the arch-shaped supporter arranged at the built-in position is gripped by the hand, concrete is sprayed by the spraying device to temporarily fix the arch-shaped supporter, and then the arch-shaped support by the hand is used. A process of releasing the holding work of
Further having
The tunnel support construction method according to claim 1 or 2. In the tunnel support erection system in which a pair of divided supporters divided into arcs are connected to each other at the upper end, an arched support is built on the face.
Including an erector apparatus having a pair of hands for detachably holding the pair of split support works;
The upper end portion of one of the pair of split supports is provided with a concave connection portion that can be engaged with the convex connection portion formed on the other upper end portion,
In the state where the erector device is disposed on the face, the pair of hands in a state of gripping the pair of split support members are relatively moved to engage the convex connection portion with the concave connection portion. Connecting the pair of split support works in an arch shape,
The concave connecting portion communicates with the insertion / extraction hole portion provided in a rectangular first joining plate provided at one upper end portion of the pair of split support works, and the insertion / extraction hole. Including a locking hole extending from the portion,
The convex connection part is a vertical part provided vertically from a rectangular second bonding plate provided at the other upper end of the pair of split support works, and a shaft part having a circular cross section, Including a locking portion provided at the tip of the shaft portion,
The locking portion has a bottom surface orthogonal to the axial direction of the shaft portion,
A diameter of the shaft portion is smaller than a width of the locking hole portion;
The diameter of the bottom surface of the locking part is larger than the width of the locking hole part and smaller than the diameter of the insertion / extraction hole part,
A pair of the concave connection portions are provided on the first joining plate, and the pair of concave connection portions are arranged at symmetrical positions across the web in the divided support where the first joining plate is provided. Has been
A pair of the convex connection portions are provided on the second joining plate, and the pair of convex connection portions are symmetrically located with respect to the web in the divided support work provided with the second joining plate. Are located in
A major axis direction of the locking hole portion extends in a direction along a side edge of the first joining plate,
When connecting the pair of divided support works in an arch shape by relatively moving the pair of hands holding the pair of split support works and engaging the convex connection part with the concave connection part The height of the upper flanges in the pair of split support members when the shaft portion of the convex connection portion is in the connection completion state positioned at the engagement end of the engagement hole portion in the concave connection portion. And the length in the major axis direction of the locking hole is defined so that the heights of the lower flanges match each other,
Built-in system for tunnel support. A target attached to each of the pair of split support works;
A surveying instrument for surveying the position of the target from a known coordinate point;
Further including
In the state where the erector device is arranged on the face, the pair of hands are relatively moved based on surveying data obtained by surveying each position of the target from a coordinate known point.
The tunnel support construction system according to claim 4. The erector device is mounted on a work vehicle including a spraying device that sprays concrete onto the face,
After connecting the pair of split supporters in an arch shape, the arch-shaped supporter is disposed at a predetermined erection position, and the arch-shaped supporter disposed at the erection position is gripped by the hand. , After spraying concrete with the spraying device and temporarily fixing the arch-shaped supporter, to release the grip of the arch-shaped supporter by the hand,
The tunnel support construction system according to claim 4 or 5.

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