Lining concrete pouring method

Abstract

To provide a lining concrete placement method which enables a lining concrete placement device to be arranged without interference with tunnel interior temporary equipment and which can be applied even to a tunnel having a long peripheral length.SOLUTION: There is provided a lining concrete placement method of selecting and combining at least two systems of a piping switching placement system 1A, a manipulator type placement system 1B, and a fixation type placement system 1C, according to a tunnel condition, and performing construction by arranging the selected systems in a predetermined range of a lining mold 8 in a tunnel circumferential direction. In the piping switching placement system 1A, a piping switching part 5 is provided via a pipe for placement 4 for each of placement positions in a concrete force-feed pipe extending in the tunnel circumferential direction, and concrete is sequentially placed while the piping switching part 5 switches to a predetermined pipe for placement 4. In the manipulator type placement system 1B, concrete is sequentially placed while a nozzle for placement 91 is guided and moved along a guide rail 92 extending in the tunnel circumferential direction with respect to a plurality of placement positions. In the fixation type placement system 1C, concrete is sequentially placed with the nozzle for placement fixed to each of a plurality of placement openings.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for driving covering concrete.

Background Art

[0002] Conventionally, a concrete driving device for constructing the tunnel covering by driving concrete into the gap between the tunnel wall surface excavated by the NATM method and the covering formwork is known (see, for example, Patent Document 1). In addition, as such a concrete driving device, a manipulator type driving device that is provided with a plurality of driving ports in the circumferential direction of the tunnel in the wife formwork installed on the face side and drives while automatically switching the driving nozzles for these plurality of driving ports is adopted (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the conventional concrete driving device as shown in Patent Document 1 described above has the following problems. That is, the manipulator type driving device as in Patent Document 1 is configured to provide the center of the structural part of the manipulator movable pipe in the left-right direction of the upper half section and move it in the circumferential direction of the tunnel. Therefore, the movable area of the manipulator movable pipe invades the space of the continuous belt conveyor for carrying out the excavation spoil to the outside of the pit or the air duct, and interferes with the in-pit temporary facilities such as the movable manipulator movable pipe and the continuous belt conveyor or air duct. Therefore, there has been a problem that a manipulator type driving device cannot be provided structurally.

[0005] In addition, in the method of placing concrete for lining using only a conventional driving device of the manipulator type, for example, when applied to an upper semi-three-center circular flat large cross-section tunnel, since the perimeter of the formwork becomes long, it has been structurally difficult to place concrete at the top end part.

[0006] The present invention has been made in view of the above-described problems, and an object thereof is to provide a method of placing concrete for lining that can be arranged without interfering with temporary facilities in the pit and can also be applied to a tunnel having a long perimeter.

Means for Solving the Problems

[0007] To achieve the above object, the method of placing concrete for lining according to the present invention uses a lining formwork extending in the circumferential direction of the tunnel wall surface, and places concrete in the concrete placement area between the tunnel wall surface and the lining formwork to construct the lining of the tunnel. A method of placing concrete for lining, wherein a piping switching unit is provided via a driving pipe at each of a plurality of driving locations in a concrete pumping pipe extending in the tunnel circumferential direction, and while switching to a predetermined driving pipe at the piping switching unit, sequentially, a piping switching driving system for driving concrete into the concrete driving area, a manipulator type driving system for guiding and moving a driving nozzle sequentially to a plurality of driving locations on a guide rail extending in the tunnel circumferential direction and driving concrete into the concrete driving area, and a fixed driving system for fixing a driving nozzle to each of a plurality of driving ports and sequentially driving concrete into the concrete driving area. At least two of the systems are arbitrarily selected and combined according to the tunnel conditions, and the selected systems are arranged and constructed in a predetermined range in the tunnel circumferential direction of the lining formwork.

[0008] In the present invention, according to tunnel conditions such as the arrangement of temporary underground facilities such as continuous belt conveyors and air ducts passing through the lining formwork and the shape of the lining formwork, at least two of the pipe switching driving system, the manipulator type driving system, and the fixed type driving system can be arbitrarily selected and combined. Therefore, it can be suitably arranged at a predetermined position in the circumferential direction of the tunnel to drive concrete. As a result, it can be arranged without interfering with the temporary underground facilities and is also applicable to tunnels with a long perimeter.

[0009] Further, the lining concrete driving method according to the present invention may be characterized in that the fixed driving system is provided at the top end of the tunnel, and at least one of the pipe switching driving system and the manipulator type driving system is provided at the side portion of the tunnel.

[0010] Further, the lining concrete driving method according to the present invention is such that the tunnel is an upper semi-three-centered circular flat large cross-section tunnel, the fixed driving system is provided at the top end of the tunnel, the pipe switching driving system is provided at one of the first side portions on the side of the tunnel, the manipulator type driving system is provided at the other second side portion on the side of the tunnel, and extension facilities such as an air duct and a continuous belt conveyor passing through the lining formwork are provided at at least one of the first side portion and the top end of the tunnel.

[0011] In this case, even in an upper semi-three-centered circular flat large cross-section tunnel with a long perimeter of the formwork, by providing a fixed driving system at the top end of the tunnel, a pipe switching driving system at one of the first side portions, and a manipulator type driving system at the other second side portion, it is possible to easily drive concrete at the top end of the tunnel where concrete driving has been difficult conventionally.

Effect of the Invention

[0012] According to the lining concrete driving method of the present invention, it can be arranged without interfering with the temporary underground facilities and has the effect of being applicable to tunnels with a long perimeter.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0014] Hereinafter, the method for driving the covering concrete according to the embodiment of the present invention will be described with reference to the drawings.

[0015] As shown in Fig. 1, the method for placing the lining concrete of the present embodiment is a construction device for automatically placing concrete in the concrete placement area 10A between the tunnel wall surface 10 excavated by the NATM method and the lining formwork 8 using the lining formwork 8 extending in the circumferential direction of the tunnel wall surface 10 to construct the lining concrete 11 of the tunnel.

[0016] As the method for placing the lining concrete, at least two (three in this first embodiment) of the pipe switching placement system 1A, the manipulator type placement system 1B, and the fixed type placement system 1C are arbitrarily selected and combined according to the tunnel conditions, and the selected systems 1A, 1B, and 1C are arranged in the tunnel circumferential direction X2 of the lining formwork 8 for construction.

[0017] The tunnel according to the present embodiment is an upper semi-three-centered flat large cross-section tunnel. A fixed type placement system 1C is provided at the tunnel top end portion 100A, a pipe switching placement system 1A is provided at the first side portion 100B on one side (the left side of the drawing in Fig. 1) of the tunnel side portion, and a manipulator type placement system 1B is provided at the second side portion 100C on the other side (the right side of the drawing in Fig. 1) of the tunnel side portion. And extension facilities (not shown) such as an air duct and a continuous belt conveyor passing through the lining formwork 8 are provided at at least one of the first side portion 100B and the tunnel top end portion 100A.

[0018] The pipe switching placement system 1A is configured to sequentially place concrete in the concrete placement area 10A while switching to the placement pipe 4 by the pipe switching portion 5 provided at a plurality of placement locations connected to the concrete pumping pipe 2 extending in the tunnel circumferential direction X2.

[0019] The manipulator type placement system 1B is configured to sequentially place concrete in the concrete placement area 10A while guiding the placement nozzle 91 along the guide rail 92 extending in the tunnel circumferential direction X2 and moving it to a plurality of placement locations.

[0020] The fixed placement system 1C is configured to fix a placement nozzle (not shown) to each of a plurality of placement ports 81 and sequentially place concrete into the concrete placement area 10A.

[0021] Here, the tunnel cross-section targeted in this embodiment is arch-shaped, and lining is constructed on the inner peripheral surface of the arch on the bottom plate 12. And, the tunnel wall surface 10 into which concrete is placed is provided with supports such as sprayed concrete, rock bolts, and steel supports as necessary, and a waterproof sheet (not shown) is provided over the entire surface.

[0022] As the concrete to be placed, for example, medium-fluid lining concrete with excellent fluidity and no material separation can be used.

[0023] Here, in the lining formwork 8 used for placing concrete, the face side (also called the wife side) in the tunnel axis direction X1 along the tunnel longitudinal direction is defined as the face part, and the portal side (also called the existing lining side, lap side) is defined as the portal part.

[0024] The lining formwork 8 has an arch shape when viewed from the tunnel axis direction X1. The lining formwork 8 is provided at a predetermined length along the tunnel axis direction X1, and while moving the lining formwork 8 toward the face side in parallel with tunneling at a position behind the face (for example, a position 100 m behind), concrete is placed into the concrete placement area 10A between the lining formwork 8 and the tunnel wall surface 10 to construct lining concrete. At this time, the lining formwork 8 is overlapped with the face-side end of the inner peripheral surface of the existing lining concrete that was recently placed and set at the next placement location, and concrete placement is performed. That is, the lining formwork 8 is sequentially moved toward the face side and replaced to construct the lining concrete 11. The lining formwork 8 is set to face the tunnel wall surface 10 at a certain interval. And, a detachable wife formwork 83 that closes the opening formed at the face-side end of the lining formwork 8 is provided at the face-side end of the lining formwork 8.

[0025] The wife formwork 83 extends along the tunnel circumferential direction X2 in an arch shape similar to the lining formwork 8, and is fixed to the face side end of the lining formwork 8 after the lining formwork 8 is set. With the wife formwork 83 fixed to the lining formwork 8, the face side end of the concrete placement area 10A is held by the wife formwork 83.

[0026] The lining formwork 8 is supported from the inner peripheral side by a gantry 86 equipped with a traveling device capable of self-running on the tunnel floor 12, and is provided so that it can selectively take a placement set posture and a demolding posture with respect to the gantry 86. On the inner peripheral surface of the face part of the lining formwork 8, a plurality (13 locations in FIG. 1) of placement ports 81 (locations with the symbol 4 in FIG. 1) to which the placement pipes 4 described later can be connected are provided at intervals in the tunnel circumferential direction X2. As shown in FIG. 2, the placement port 81 opens toward the inside of the tunnel cavity, and the inside of the tunnel cavity communicates with the concrete placement area 10A. The placement ports 81 are provided at intervals of, for example, 50 cm to 2 m, which is the concrete placement unit in the tunnel circumferential direction X2.

[0027] A plurality of formwork vibrators (not shown) are provided at predetermined positions on the inner peripheral surface of the lining formwork 8. When the formwork vibrator operates, it vibrates the concrete placed in the placement area 10A through the lining formwork 8. The formwork vibrators are provided at appropriate positions spaced at intervals along the tunnel circumferential direction X2 and the tunnel axial direction X1 of the lining formwork 8.

[0028] Placement ports 81 are provided at predetermined intervals along the tunnel axial direction X1 and the tunnel circumferential direction X2 on the inner peripheral surface of the lining formwork 8. The placement ports 81 are provided so that the placement nozzles 82 can be attached during concrete placement.

[0029] Next, the configuration of the pipe switching placement system 1A will be described in detail with reference to the drawings. As shown in FIGS. 2 to 4, the pipe switching injection system 1A includes a concrete pumping pipe 2 disposed along the tunnel circumferential direction X2 of the formwork 8, a drain pipe 3 disposed along the tunnel circumferential direction X2 of the formwork 8 along the concrete pumping pipe 2, and is provided for each driving port 81 in the tunnel circumferential direction X2 of the formwork 8. A driving pipe 4 that is connectably connected at a predetermined position of the concrete pumping pipe 2 and is connected to the driving port 81 via a driving nozzle 82, a concrete driving position P1 (see FIG. 5) where the driving pipe 4 and the concrete pumping pipe 2 are connected, and a drainage position P2 (see FIG. 6) where the driving pipe 4 and the drain pipe 3 are connected. And a pipe switching device 5 for switching and connecting to either one of them.

[0030] As shown in FIG. 2, the driving port 81 is provided with an opening / closing shutter 84 for opening and closing the driving port 81. The opening / closing shutter 84 is opened and closed by rotating toward the inside of the tunnel. One end of the bent pipe 85 is fixed to the driving port 81 with the opening / closing shutter 84 open. The other end of the bent pipe 85 is detachably connected to the driving nozzle 82 provided at the tip of the driving pipe 4. The opening / closing shutter 84 closes the driving port 81 when the bent pipe 85 is removed together with the driving pipe 4 and the driving nozzle 82 after the concrete is driven.

[0031] The driving port 81 may be provided with a cleaning device (not shown) capable of injecting cleaning water for cleaning the driving pipe 4. By providing such a cleaning device, after the driving nozzle 82 is separated after the concrete is driven, the driving port 81, the driving pipe 4, and the driving nozzle 82 can be cleaned by the cleaning device. The cleaning water for cleaning the inside of the driving pipe 4 passes through the driving pipe 4 with the pipe switching device 5 set as the drainage position P2 and is drained from the drain pipe 3, which will be described in detail later.

[0032] After connecting the driving nozzle 82 provided in the driving pipe 4 to the bent pipe 85 with the opening / closing shutter 84 open, concrete is driven into the concrete driving area 10A from the driving port 81 to which the driving pipe 4 is connected. After the driving of a predetermined amount of concrete at the predetermined driving port 81 is completed and the driving nozzle 82 is detached from the bent pipe 85, the opening / closing shutter 84 is closed.

[0033] As shown in FIG. 2, the concrete pumping pipe 2 extends substantially in an arch shape in the tunnel circumferential direction X2 along the wife-shaped formwork 83 of the lining formwork 8. The concrete is pumped from a concrete pump (not shown) through the concrete pumping pipe 2, and is piped from one end 83a (the left lower end in FIG. 1) to the other end 83b (the right lower end in FIG. 1) in the tunnel circumferential direction X2 of the wife-shaped formwork 83. Pipe switching devices 5 are connected to a plurality of driving locations D1, D2,... D10 in the tunnel circumferential direction X2 of the concrete pumping pipe 2, respectively.

[0034] As shown in FIGS. 2 to 4, the concrete pumping pipe 2 is divided into an upstream side and a downstream side with the pipe switching device 5 interposed therebetween. In the following description, in a predetermined pipe switching device 5, the concrete pumping pipe 2 located on the upstream side is referred to as the upstream side pumping pipe 2A, and the concrete pumping pipe 2 located on the downstream side is referred to as the downstream side pumping pipe 2B. The upstream side pumping pipe 2A and the downstream side pumping pipe 2B are provided so as to be connectable to the connecting pipes 52A and 54A provided in the pipe switching device 5 described later. In a state where the connecting pipes 52A and 54A are connected, concrete is pumped from the upstream side pumping pipe 2A to the downstream side pumping pipe 2B through the connecting pipes 52A and 54A.

[0035] As shown in Fig. 1, the drain pipe 3 extends substantially in an arch shape in parallel with the concrete pumping pipe 2 disposed in the tunnel circumferential direction X2 along the side form 83 of the formwork 8. The end of the drain pipe 3 is located near the other end 83b of the side form 83 described above. The drain pipe 3 is mainly used for draining the washing water of the driving nozzle 82 and the driving pipe 4 after the concrete is driven. When the end side of the drain pipe 3 is the upstream side, the downstream side of the drain pipe 3 is piped to the drainage facility in the tunnel for drainage, or is joined to the drainage pipeline (not shown) piped in the tunnel and drained to the outside of the pit.

[0036] As shown in Figs. 2 and 3, the drain pipe 3 is provided with branch drain pipes 31 branched at a plurality of driving positions D1, D2,... D10 in the tunnel circumferential direction X2. The branch drain pipe 31 is provided so as to be connectable to the drainage connection pipe 52B and the switching connection pipe 54B described later of the pipe switching device 5 at the drainage position P2 (see Fig. 6) when washing the inside of the driving pipe 4, and is connected to the driving pipe 4 via the drainage connection pipe 52B and the switching connection pipe 54B. In a state where the branch drain pipe 31 is connected to the driving pipe 4 via the connection pipes 52B and 54B at the drainage position P2, the residual concrete and washing water in the driving pipe 4 are discharged from the driving pipe 4 through the connection pipes 52B and 54B, the branch drain pipe 31, and the drain pipe 3 to the outside of the pit.

[0037] One end of the driving pipe 4, the base end 4b, is fixed to the second guide plate 53 described later of the pipe switching device 5, and the other end, the tip end 4a, is connected to the driving port 81 via the driving nozzle 82, and is piped in a state of protruding more toward the face side than the side form 83. The driving nozzle 82 is detachably connected to the tip end 4a of the driving pipe 4 by a joint portion 41.

[0038] The pipe switching device 5 is provided so as to be switchable to the concrete driving position P1 shown in Fig. 5, the drainage position P2 shown in Fig. 6, and the retracted position P3 shown in Fig. 7 which is a position different from the concrete driving position P1 and the drainage position P2. At the concrete driving position P1, the concrete pumped by the concrete pumping pipe 2 is switched to the driving pipe 4 side. At the retracted position P3, the concrete pumping pipe 2 is in a continuous state on the downstream side of the position where the driving pipe 4 is provided.

[0039] As shown in FIGS. 2 to 4, the pipe switching device 5 is configured to include a first guide plate 51, a first slide switching plate 52, a second slide switching plate 54, and a second guide plate 53 in this order from the upstream side to the downstream side in the concrete pumping pipe 2.

[0040] The first guide plate 51 fixes the first split end 2a of the upstream pumping pipe 2A and one end of the drain pipe 3 (branch drain pipe 31).

[0041] The second guide plate 53 fixes the second split end 2b of the downstream pumping pipe 2B and the base end 4b of the driving pipe 4.

[0042] The first slide switching plate 52 is guided by the first guide plate 51 and slides in the tunnel axis direction X1 in the plate surface direction. The first slide switching plate 52 has a first concrete pumping connection pipe 52A that can be connected to the first split end 2a of the upstream pumping pipe 2A of the first guide plate 51 at the non-slide position S10 (see FIG. 3) which is the concrete driving position P1 shown in FIG. 5, and a drain connection pipe 52B that can be connected to one end 3a of the drain pipe 3 (branch drain pipe 31) of the first guide plate 51 at the drain position P2 shown in FIG. 6.

[0043] The second slide switching plate 54 is guided by the second guide plate 53 and slides in the tunnel axis direction X1 in the plate surface direction. As shown in FIG. 5, the second slide switching plate 54 has a switching connection pipe 54B that can be connected to the base end 4b of the driving pipe 4 and the first concrete pumping connection pipe 52A at the slide position S21 where the concrete driving position P1 is located, and can be connected to the base end 4b of the driving pipe 4 and the drain connection pipe 52B at the drain position P2 as shown in FIG. 6. As shown in FIG. 7, at the retracted position P3, it has a second concrete pumping connection pipe 54A that can be connected to the first concrete pumping connection pipe 52A and the second split end 2b of the downstream pumping pipe 2B.

[0044] The piping switching device 5 is provided with a slide mechanism (not shown) such as a hydraulic jack that moves the first slide switching plate 52 and the second slide switching plate 54 respectively. A control unit (not shown) is provided to control the slide mechanism so that the first slide switching plate 52 and the second slide switching plate 54 reach the concrete driving position P1, the drainage position P2, and the retracted position P3, and also reach the non-slide positions S10, S20 and the slide positions S11, S21.

[0045] Next, the manipulator type driving system 1B will be described in detail with reference to the drawings. As shown in FIGS. 1 and 8, the manipulator type driving system 1B includes a driving nozzle 91 that is detachable via a driving pipe 90 at a driving port 81, a guide rail 92 that is arranged on the face side from the gantry 86 of the formwork 8 and extends along the tunnel circumferential direction X2, a nozzle moving device 93 that includes the driving nozzle 91 and is guided by the guide rail 92, and a control unit (not shown) that detects the driving state of the concrete and switches the connection position of the driving nozzle 91 with respect to a plurality of driving ports 81.

[0046] As shown in FIG. 8, the driving nozzle 91 is mounted on the nozzle moving device 93, and the base end portion 91b of the driving nozzle 91 is connected to a flexible pipe 94 that is connected to a concrete pumping pump (not shown). The tip end portion 91a of the driving nozzle 91 is detachably inserted into the insertion port of the driving pipe 90.

[0047] The flexible pipe 94 is a multi-joint pipe connected by a plurality of joint portions, and is provided with a pipe switching device 95. The flexible pipe 94 is installed so as to be fixed to the formwork 8 after the formwork 8 is installed at the position of the concrete driving target in the tunnel axis direction X1. Specifically, one end of the flexible pipe 94 is connected to the base end portion 91b of the driving nozzle 91 mounted on the nozzle moving device 93, and the other end is connected to the pipe switching device 95. One flexible pipe 94 is provided on each of the left and right sides when viewed from the face side.

[0048] Based on the control signal from the control unit, the pipe switching device 95 switches to one of the movable pipes arranged by a plurality of joint parts and discharges the concrete. The joint parts of the movable pipe 94 are hydraulically controlled based on the control instructions output from the control unit, so that the posture of each joint is controlled. By driving the movable pipe 94, each nozzle moving device 93 moves along the outer peripheral surface of the guide rail 92 in the tunnel circumferential direction X2. As a result, the driving nozzle 91 can move to the vicinity of any one of the plurality of driving ports 81, and the position where the concrete is driven can be switched.

[0049] The guide rail 92 is provided along the tunnel circumferential direction X2 on the face side of the lining formwork 8. The guide rail 92 is fixed and supported on the face side of the gantry 86 that supports the lining formwork 8. The guide rail 92 moves the nozzle moving device 93 in the tunnel circumferential direction X2.

[0050] The nozzle moving device 93 can move the driving nozzle 91 along the guide rail 92 and can perform concrete driving in the concrete driving area. In addition, the nozzle moving device 93 is provided with a front and rear sliding part for attaching and detaching the driving pipe 90 of the driving nozzle 91 to and from the insertion port. This front and rear sliding part moves the driving nozzle 91 so as to extend it in the tunnel axis direction X1 (front and rear direction) of the nozzle moving device 93.

[0051] Next, a lining concrete driving method for driving concrete into the concrete driving area 10A using the pipe switching driving system 1A and the manipulator type driving system 1B will be specifically described with reference to the drawings. As shown in FIG. 2, in the pipe switching driving system 1A, as described above, the concrete pumping pipe 2 and the drain pipe 3 are arranged along the tunnel circumferential direction X2 of the formwork 8, and in the middle of the concrete pumping pipe 2, the pipe switching device 5 is arranged near each of a plurality of driving ports 81 arranged in the tunnel circumferential direction X2 of the formwork 8. Further, driving nozzles 82 are attached to a plurality of driving ports 81 provided on the inner peripheral surface of the formwork 8, and driving pipes 4 are connected to these driving nozzles 82.

[0052] First, the concrete driving method will be described. As shown in FIG. 1, the formwork 8 is moved and arranged to the position in the tunnel axis direction X1 where the concrete is to be driven. Next, the wife formwork 83 is fixed to the end portion on the face side of the formwork 8. Then, each driving port 81 provided in the predetermined formwork 8 at the location where the concrete is to be driven is opened by the opening / closing shutter 84.

[0053] Subsequently, as shown in FIG. 5, the pipe switching device 5 near the aforementioned predetermined driving port 81 is operated by the control unit to set the concrete driving position P1. Specifically, first, the first slide switching plate 52 provided on the first guide plate 51 is left in the non-slide position S10 without being slid. That is, in the first slide switching plate 52, the first concrete pumping connection pipe 52A is connected to the upstream pumping pipe 2A, and the drain connection pipe 52B is not connected to the branch drain pipe 31 of the drain pipe 3.

[0054] Thereafter, the second slide switching plate 54 is slid horizontally to connect the switching connecting pipe 54B to the joint portion of the base end 4b of the driving pipe 4, and the second concrete pumping connecting pipe 54A is separated from the first concrete pumping connecting pipe 52A. At this time, the downstream pumping pipe 2B located on the downstream side of the pipe switching device 5 is separated from the second concrete pumping connecting pipe 54A, and concrete is not pumped from the upstream pumping pipe 2A to the downstream pumping pipe 2B. Further, the upstream end of the switching connecting pipe 54B is connected to the first concrete pumping connecting pipe 52A. When such a concrete driving position P1 is reached, the driving preparation is completed, and a concrete pumping pump (not shown) is driven to pump concrete from the concrete pumping pipe 2 through the driving pipe 4 into the driving port 81.

[0055] Here, the pipe switching operation and the concrete driving operation for setting the above-described pipe switching device 5 to the concrete driving position P1 are input by an operator from the operation unit for the driving start instruction. Then, when the control unit (not shown) detects that a driving start instruction has been input at the operation unit, it starts the driving process. That is, the control unit controls the pipe switching device 5 to be in the concrete driving position P1, and after confirming that the switching has been made to the concrete driving position P1, it automatically pumps concrete from the concrete pumping pipe 2 and controls the concrete to be driven from the driving nozzle 82 through the driving pipe 4 into the concrete driving area 10A on the back side of the formwork 8. Then, the control unit controls the driving (pumping) of the concrete to stop when a predetermined amount of concrete has been driven.

[0056] Note that since the driving pipe 4 fixed to the driving port 81 of the formwork 8 moves when the formwork 8 is set and when the form is removed, the connection with the pipe switching device 5 fixed to the frame of the formwork 8 is made using the driving connection pipe 41 shown in FIGS. 5 to 7 that can move several centimeters in the left-right, up-down directions. Also, during the concrete driving, a formwork vibrator is used to vibrate and compact the concrete according to the driving situation of the concrete.

[0057] Next, the cleaning of the driving pipe 4 after the concrete driving through the predetermined driving port 81 is completed will be specifically described. First, at the timing when the concrete driving is completed, the driving port 81 is blocked by the opening / closing shutter 84.

[0058] As shown in FIG. 6, the pipe switching device 5 near the driving port 81 where the concrete driving is completed is switched from the concrete driving position P1 to the drainage position P2. Specifically, the first slide switching plate 52 is guided by the first guide plate 51 and laterally slides to move from the non-slide position S10 to the slide position S11. That is, in the first slide switching plate 52, the drainage connection pipe 52B is connected to the branch drainage pipe 31 of the drainage pipe 3, and the first concrete pumping connection pipe 52A is not connected to the upstream pumping pipe 2A. Further, in the second slide switching plate 54, it remains in the slide position S21. At this time, although the first concrete pumping connection pipe 52A and the second concrete pumping connection pipe 54A are connected, both are disconnected from the upstream pumping pipe 2A and the downstream pumping pipe 2B. Also, the switching connection pipe 54B has its downstream end connected to the driving pipe 4 and its upstream end connected to the drainage connection pipe 52B. Thereby, when the drainage position P2 is reached, the preparation for cleaning the driving pipe 4 is completed, and the inside of the driving pipe 4 is cleaned by sending water from the tip 4a (driving port 81 side) of the driving pipe 4 and draining it through the drainage pipe 3.

[0059] Here, the pipe switching operation to the drainage position P2 by the above-described pipe switching device 5 and the water supply operation are input by the operator from the operation unit as an instruction to start cleaning. Then, when the control unit (not shown) detects that the cleaning start instruction has been input at the operation unit, it starts the cleaning process. That is, the control unit controls the pipe switching device 5 to be in the drainage position P2, and after confirming that the switching to the drainage position P2 has been completed, water is automatically supplied from a water supply pipe (not shown) into the driving pipe 4, and it is controlled to be drained through the switching connection pipe 54B and the drainage connection pipe 52B to the drainage pipe 3 through the driving pipe 4. And when the cleaning of the inside of the driving pipe 4 is completed, it is controlled to stop the water supply from the water supply pipe.

[0060] Next, after the cleaning of the driving pipe 4 is completed after the concrete driving through the predetermined driving port 81 is finished, the driving port switching operation when driving concrete through the next driving port 81 will be specifically described.

[0061] As shown in Fig. 7, the pipe switching device 5 near the driving port 81 where the cleaning is completed is switched from the drainage position P2 to the retracted position P3. Specifically, the first slide switching plate 52 is guided by the first guide plate 51 and laterally slid to return from the slide position S11 to the non-slide position S10. Then, the second slide switching plate 54 is guided by the second guide plate 53 and laterally slid to return from the slide position S21 to the non-slide position S20. That is, in the first slide switching plate 52, the first concrete pumping connecting pipe 52A is connected to the upstream pumping pipe 2A, and the drainage connecting pipe 52B is separated from the branch drainage pipe 31 of the drainage pipe 3 and is in a separated state.

[0062] Also, in the second slide switching plate 54, the second concrete pumping connecting pipe 54A is connected to the first concrete pumping connecting pipe 52A and the downstream pumping pipe 2B, the switching connecting pipe 52B is connected to the drainage connecting pipe 53B, and the driving pipe 4 is in a disconnected state without being connected. As a result, when it reaches the retracted position P3, the upstream pumping pipe 2A and the downstream pumping pipe 2B are connected by a pair of concrete pumping connecting pipes 52A and 54A, and the state is such that concrete can be pumped to the downstream side of the pipe switching device 5.

[0063] As described above, in the concrete placing method for the lining, the pipe switching devices 5 arranged at intervals in the tunnel circumferential direction X2 along the concrete pumping pipe 2 for each of the plurality of driving ports 81 are sequentially switched, and the above-described concrete driving positions P1, drainage positions P2, and retracted positions P3 are appropriately switched by each pipe switching device 5 for driving.

[0064] As described above, in the present embodiment, since the pipe switching device 5 is arranged near each of the plurality of driving ports 81 in the tunnel circumferential direction X2 of the formwork 8 in the middle of the concrete pumping pipe 2, the driving nozzle 82 is attached to the plurality of driving ports 81, and the driving pipe 4 is connected to the driving nozzle 82. The proximal end of the driving pipe 4 is provided near the pipe switching device 5 arranged near the driving port 81. The pipe switching device 5 corresponding to the driving port 81 to be driven is set as the concrete driving position P1, and the concrete pumping pipe 2 and the driving pipe 4 are connected to send the concrete to the driving port 81 side, and the concrete can be driven into the concrete driving area from the driving nozzle 82.

[0065] Thus, in the present embodiment, the pipe switching device 5 with a small pipe switching movement amount is provided at a position in the middle of the concrete pumping pipe 2, and it is not necessary to use a manipulator-type driving device with a large movable area as in the prior art in the entire area in the tunnel circumferential direction X2. Therefore, the concrete pumping pipe 2 and the pipe switching device 5 can be arranged without interfering with the temporary facilities in the pit such as the continuous belt conveyor and the air duct passing through the formwork 8, and a sufficient space for passing these temporary facilities in the pit can be secured, and it is also applicable to a tunnel with a long perimeter.

[0066] Further, in the present embodiment, after the concrete driving is completed, the drain pipe 3 and the driving pipe 4 are connected with the pipe switching device 5 as the drainage position P2, and water is sent from the driving port 81 side of the driving pipe 4 and drained through the drain pipe 3, so that the inside of the driving pipe 4 can be cleaned, and the working efficiency for cleaning the driving pipe 4 can be improved. In this way, in the present embodiment, by providing the pipe switching device 5 and appropriately switching it by controlling the pipe switching device 5 during concrete driving and cleaning, automatic construction of the formwork concrete becomes possible.

[0067] Also, in the present embodiment, by setting the pipe switching device 5 to the retracted position P3, the concrete pumping pipes 2 located upstream and downstream of the pipe switching device 5 set to this retracted position P3 communicate with each other, and concrete can be pumped downstream. By only the operation of setting the pipe switching device 5 to the retracted position P3, the operation of switching to the concrete driving position P1 using the pipe switching device 5 on the downstream side of this pipe switching device 5 can be easily performed.

[0068] Furthermore, in the present embodiment, in the pipe switching device 5, by connecting the second slide switching plate 54 at the concrete driving position P1 to the proximal end of the driving pipe 4 and the first connecting pipe, concrete can be driven from the concrete pumping pipe 2 through the driving pipe 4 into the driving port 81. And at the drainage position P2, by connecting the proximal end of the driving pipe 4 and the second connecting pipe to the third connecting pipe, the driving pipe 4 is connected to the drain pipe 3, and the cleaned water flowing in the driving pipe 4 used for driving the concrete can be drained from the drain pipe 3. Also, at the retracted position P3, by connecting a fourth connecting pipe to the first concrete pumping connecting pipe 52A and the second split end of the downstream pumping pipe 2B, the concrete pumping pipes 2 located upstream and downstream of the pipe switching device 5 set to this retracted position P3 communicate with each other, and concrete can be pumped downstream through the concrete pumping pipe 2.

[0069] Also, in the present embodiment, the control unit controls the slide mechanism and moves the first slide switching plate 52 and the second slide switching plate 54, so that the switching operation between the concrete driving position P1 and the drainage position P2 can be easily performed.

[0070] Next, the operation of the above-described concrete placing method for the capping will be described in detail with reference to the drawings. In this embodiment, as shown in FIGS. 2 and 4, according to tunnel conditions such as the arrangement of temporary underground facilities such as a continuous belt conveyor and air ducts passing through the formwork 8 and the shape of the formwork 8, at least two of the pipe switching driving system 1A, the manipulator type driving system 1B, and the fixed type driving system 1C can be arbitrarily selected and combined. Therefore, it can be suitably arranged at a predetermined position in the tunnel circumferential direction X2 to drive the concrete. As a result, it can be arranged without interfering with the temporary underground facilities, and it can also be applied to tunnels with a long perimeter.

[0071] As described above, in the formwork concrete driving method according to this embodiment, there is an advantage that it can be arranged without interfering with temporary underground facilities such as a continuous belt conveyor and air ducts, and it can also be applied to tunnels with a long perimeter.

[0072] As described above, the embodiments of the formwork concrete driving method according to the present invention have been described. However, the present invention is not limited to the above embodiments, and can be appropriately changed without departing from the gist thereof. For example, as in the second embodiment shown in FIG. 9, a formwork concrete driving method may be used in which a fixed type driving system 1C is provided at the tunnel top end, and manipulator type driving systems 1B, 1B are provided on both sides of the tunnel side part. Also, as in the third embodiment shown in FIG. 10, a formwork concrete driving method may be used in which a fixed type driving system 1C is provided at the tunnel top end, and pipe switching driving systems 1A, 1A equipped with pipe switching devices 5 are provided on both sides of the tunnel side part.

[0073] Furthermore, in the above-described embodiment, the piping switching device 5 is configured to include a slide-type first slide switching plate 52 and a second slide switching plate 54. However, the configuration is not limited to this. In short, any piping switching device that can switch and connect to either the concrete driving position P1 where the driving pipe 4 and the concrete pumping pipe 2 are connected, or the drainage position P2 where the driving pipe 4 and the drain pipe 3 are connected is acceptable, and it is not limited to the slide type as in the above-described embodiment. For example, it is also possible to adopt a piping switching device provided with a rotary switching plate that rotates around the pipe axis of the concrete pumping pipe 2 as the rotation center.

[0074] In addition, in the above-described embodiment, the configuration in which the lining concrete driving device 1 is provided on the face side (wife side) has been described as an example. However, for example, the lining concrete driving device 1 may be provided on the overlap side (shaft side) according to the gradient of the tunnel.

[0075] Also, in the present embodiment, the control unit is provided to control the slide mechanism so that the first slide switching plate 52 and the second slide switching plate 54 reach the concrete driving position P1 and the drainage position P2. However, it is not limited to providing such a control unit for control, and the concrete driving position P1 and the drainage position P2 may be switched manually.

[0076] In addition, within the scope not departing from the gist of the present invention, it is possible to appropriately replace the components in the above-described embodiment with well-known components.

Explanation of Reference Numerals

[0077] 1A Piping Switching Driving System 1B Manipulator-Type Driving System 1C Fixed-Type Driving System 2 Concrete Pumping Pipe 2A Upstream Pumping Pipe 2B Downstream Pumping Pipe 3 Drain Pipe 4 Driving Pipe 5 Piping Switching Device 8 Formwork for Overlay Work 9 Manipulator-Type Driving Device 10 Tunnel Wall 10A Concrete Driving Area 31 Branch Drain Pipe 51 First Guide Plate 52 First Slide Switching Plate 52A First Concrete Pumping Connecting Pipe 53B Drainage Connecting Pipe 53 Second Guide Plate 54 Second Slide Switching Plate 54A Second Concrete Pumping Connecting Pipe 54B Switching Connecting Pipe 81 Driving Port 82 Driving Nozzle P1 Concrete Driving Position P2 Drainage Position P3 Retracted Position S10, S20 Non-Slide Positions S11, S21 Slide Positions X1 Tunnel Axial Direction X2 Tunnel Circumferential Direction

Claims

[Claim 1] A lining concrete pouring method for constructing a tunnel lining by pouring concrete into a concrete pouring area between a tunnel wall surface and the lining formwork, the method comprising: A piping switching and pouring system in which a piping switching unit is provided for each of a plurality of pouring points in a concrete pumping pipe extending in a circumferential direction of the tunnel via a pouring pipe, and concrete is poured into the concrete pouring area sequentially while switching to a predetermined pouring pipe at the piping switching unit; A manipulator-type concrete pouring system that pours concrete into the concrete pouring area while guiding a pouring nozzle sequentially to a plurality of pouring locations on a guide rail extending in a circumferential direction of the tunnel; a fixed pouring system for fixing a pouring nozzle to each of a plurality of pouring holes and pouring concrete into the concrete pouring area in sequence; The tunnel is an upper half tricentric flat large cross-section tunnel, The fixed driving system is provided at the top end of the tunnel, The piping switching and driving system is provided on a first side of one of the tunnel sides, The manipulator-type driving system is provided on the other second side of the tunnel, An extension facility consisting of an air duct or a continuous belt conveyor passing through the lining formwork is provided on at least one of the first side portion and the tunnel top end portion, A method for pouring lining concrete, characterized in that the lining formwork is placed in a predetermined range around the tunnel circumference and then construction is carried out.

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