JP7174681B2 - Conveying system and drilling method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a conveying system and an excavating method.

Conventionally, a capsule transportation facility described in Patent Document 1 below is known. This capsule transportation equipment is used in the excavation work of a shaft. A transport pipe is provided in the shaft, and a capsule containing the excavated waste is transported through the transport pipe by air pressure, thereby transporting the excavated waste from the bottom of the vertical shaft to the outside of the vertical shaft.

JP-A-2000-44057

In this type of shaft excavation work, blasting treatment of the excavation surface is sometimes performed for efficient excavation. In this case, it is necessary to avoid damage due to blasting, but since the conventional conveying pipe is a facility fixed to the wall of the shaft, it could not be evacuated. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a conveying system for making the conveying pipe retractable and an excavation method using the same.

The conveying system of the present invention conveys the excavated waste out of the shaft by using air pressure to convey the conveying container containing the excavated waste in the vertical shaft during excavation work in the conveying pipe provided in the vertical shaft. A system comprising: a conveying pipe having a conveying pipe main body fixed to the inner wall surface of a shaft; and a lower end pipe connected to the lower end of the conveying pipe main body forming the lower end of the conveying pipe; provided on an elevating platform installed in a container feeding section for feeding a conveying container into the conveying pipe; and a moving mechanism for moving the lower end pipe upward with respect to the conveying pipe main body.

The lower end pipe is detachably attached to the lower end of the conveying pipe main body, and the moving mechanism moves the lower end pipe detached from the conveying pipe main body to a position deviated from the conveying pipe main body in a plan view and upward. It may be moved. Further, the moving mechanism may lift the lower end pipe together with the lifting frame while being supported by the lifting frame.

The moving mechanism has a rotating plate that horizontally rotates the container delivery unit on the lifting frame around an axis different from the pipe axis of the conveying pipe. , the lower end pipe may be moved to a position deviated from the conveying pipe main body in a plan view.

In the excavation method of the present invention, a transport container containing excavated waste in a shaft during excavation work is transported using air pressure in a transport pipe provided in the vertical shaft, thereby transporting the excavated waste out of the vertical shaft. An excavation method for excavating a pit using a system, wherein the conveying system includes a conveying pipe main body fixed to the inner wall surface of the pit and a lower end connected to the lower end of the conveying pipe main body forming the lower end of the conveying pipe. and a container delivery unit provided on an elevating platform installed in the vertical shaft so as to be able to ascend and descend, and delivering the transport container into the transport pipe, wherein the lower end pipe is the transport pipe main body. a moving step of moving upward with respect to the shaft; a retreating step of retreating the lifting platform upward;

In the moving step, the lower end tube removed from the carrier tube main body may be moved to a position deviated from the carrier tube main body in plan view and moved upward.

ADVANTAGE OF THE INVENTION According to this invention, the conveying system for making a conveying pipe retractable, and the excavation method using the same can be provided.

1 is a cross-sectional view of a shaft including an embodiment transport system; FIG. (a) is a plan view of the lowest stage of the scaffold, and (b) is a plan view of another stage of the scaffold. (a) to (d) are diagrams sequentially showing a procedure for retracting the scaffold upward and returning it again. 4(a) to 4(c) are diagrams sequentially showing the procedure for retracting the scaffold upward and returning it again following FIG. 3; FIG. (a), (b) is a figure which shows the modification of the moving mechanism of a conveying system. (a), (b) is a figure which shows the other modification of a moving mechanism. (a), (b) is a figure which shows the other modification of a moving mechanism. (a) and (b) are diagrams showing still another modification of the moving mechanism, and (c) is a cc cross-sectional view in (a). (a), (b) is a figure which shows the other modification of a moving mechanism.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the conveying system which concerns on this invention, and an excavation method is described in detail, referring drawings.

As shown in FIG. 1, the transport system 1 is constructed in a shaft 101 during excavation. The conveying system 1 is a system that carries excavation muck generated by excavation of the excavation surface 103 from the vicinity of the excavation surface 103 to the outside of the shaft 101 (on the ground) using air pressure. For example, shaft 101 is a shaft for processing high-level radioactive waste.

A scaffold 3 (elevating platform) is installed in the shaft 101 during excavation work. The scaffold 3 has three stages used as work scaffolds and the like, and an excavating arm 7 having a bucket 9 is provided on the lower surface of the lowest stage 5 . The excavation arm 7 scoops up the excavation muck from the excavation surface 103 by the bucket 9 . The scaffold 3 is suspended by a wire 13 from an upper hoist 11 and can move up and down in the shaft 101 by driving the hoist 11 .

The transport system 1 is provided with a transport pipe 15 extending vertically in the shaft 101 , and the transport pipe 15 extends from a position slightly above the lowest stage 5 of the scaffold 3 to the ground. The conveying pipe 15 is configured by continuously connecting a plurality of steel pipes having a length of about 26 m, for example, and is vertically fixed to the inner wall surface 105 of the shaft 101 . In addition, as shown in FIG. 2( b ), each of the other two stages 6 of the scaffold 3 has a shape with a notch so as not to interfere with the carrier pipe 15 . A capsule 17 (conveying container) capable of containing excavated muck passes through the conveying pipe 15 . The capsule 17 has a circular shape with a slightly smaller diameter than the inner diameter of the carrier tube 15 in plan view. Also, the capsule 17 has a vessel shape with an opening at the upper end.

Further, the transport system 1 has a blower 19 connected to the upper end of the transport pipe 15 . The blower 19 sucks the inside of the conveying pipe 15 to generate an upward air flow inside the conveying pipe 15 . Due to this air flow, when the capsule 17 is placed in the carrier tube 15, the air pressure below the capsule 17 is higher than the air pressure above it. This pressure difference generates a force that pushes the capsule 17 upward, and serves as a power source for moving the capsule 17 within the conveying pipe 15 . Further, the transport system 1 includes a capsule delivery section 21 (container delivery section) provided on the upper surface of the lowermost stage 5 . The capsule delivery unit 21 is positioned vertically below the carrier pipe 15 and delivers the capsules 17 into the carrier pipe 15 through the lower end opening of the carrier pipe 15 . The structure of the capsule delivery section 21 for delivering the capsule 17 will be described later.

When the capsule 17 containing excavated muck is delivered from the lower end opening of the carrier pipe 15 by the capsule delivery section 21, the air flow in the carrier pipe 15 causes the capsule 17 to rise and reach the ground. When the capsule 17 is taken out from the capsule take-out port 23 provided on the ground portion of the conveying pipe 15, carrying out the excavated muck to the ground is completed. The empty capsule 17 descends through the conveying pipe 15 again and is returned to the capsule delivery section 21 for reuse.

Operation of the transport system 1, including details of the structure and operation of the capsule delivery section 21, will now be further described. As also shown in FIG. 2( a ), the capsule delivery section 21 has a rotating plate 27 provided on the upper surface of the lowermost stage 5 . The rotary plate 27 is horizontally rotatable on the lowermost stage 5 , and the rotation axis 27 a of this horizontal rotation is located deviated from the tube axis of the carrier tube 15 .

Furthermore, the capsule delivery unit 21 has two capsule holding cylinders 29 erected on the rotating plate 27 . The capsule holding cylinders 29 are located on opposite sides of each other with the rotation axis 27a interposed therebetween. The capsule holding cylinder 29 has a cylindrical shape with substantially the same diameter as the conveying tube 15, and the capsule 17 is inserted and held in the hollow portion of the capsule holding cylinder 29. As shown in FIG. The inserted capsule 17 does not protrude upward from the capsule holding tube 29, and the upper end surface of the capsule holding tube 29 is located slightly lower than the lower end surface of the conveying tube 15. rotates horizontally without interfering with the carrier pipe 15.

The capsule holding tube 29 rotates as the rotating plate 27 rotates, and one position that the capsule holding tube 29 can take is a position immediately below the transport tube 15 and coaxial with the transport tube 15 . The position of this capsule holding tube 29 is called "first position P1", and the position taken by the other capsule holding tube 29 at this time is called "second position P2". The capsule delivery unit 21 also includes an elevation jack (not shown) for raising and lowering the capsule holding tube 29 with respect to the rotating plate 27 . When the elevating jack is driven at the first position P1, the capsule holding cylinder 29 is lifted, and the upper end surface of the capsule holding cylinder 29 contacts the lower end surface of the conveying pipe 15, and the inner wall surface of the capsule holding cylinder 29 and the conveying pipe 15 smoothly connected to the inner wall surface of

Excavation muck is thrown into the capsule 17 held in the capsule holding cylinder 29 at the second position P2 through the opening at the upper end. A conveying section (not shown) may be provided for conveying excavated muck scooped up from the excavation surface 103 by the bucket 9 of the excavating arm 7 until it is put into the capsule 17 . For example, the conveying section may include a hopper provided above the second position P2, a belt conveyer that conveys the excavated muck to the hopper, and the like.

When the capsule 17 is filled with the excavated muck, the rotary plate 27 is rotated by 180° to move the capsule holding tube 29 to the first position P1. At this time, the other capsule holding tube 29 already holds the empty capsule 17 returned from the ground and is moved to the second position P2.

Next, when the capsule holding cylinder 29 at the first position P1 is lifted by the lifting jack and connected to the conveying pipe 15, the capsule 17 containing the excavated waste is lifted by air flow in the conveying pipe 15 and rises. Then, the capsule 17 that has reached the capsule take-out port 23 is taken out on the ground, and the excavated waste inside the capsule 17 is discharged. After that, the empty capsule 17 is returned to the capsule holding tube 29 at the first position P1 through the conveying pipe 15 again. While the capsule 17 at the first position P1 reciprocates on the ground as described above, excavation muck from the bucket 9 is thrown into the capsule 17 at the second position P2. By repeating the operation of the transport system 1 as described above, the excavation muck generated on the excavation surface 103 is carried out to the ground.

In the method of excavating the vertical shaft 101 using the conveying system 1, the excavation surface 103 is blasted, so it is necessary to prevent the conveying pipe 15 from being damaged by the blasting. Therefore, the conveying system 1 separates the lower end of the conveying pipe 15 from the inner wall surface 105 of the shaft 101 and moves the lower end upward in order to allow the lower end of the conveying pipe 15 to be retracted during blasting. A mechanism 30 is provided. The moving mechanism 30 includes a hoist 11 that lifts the scaffold 3 and raises the lower end of the conveying pipe 15 together with the scaffold 3 . A specific configuration of such a moving mechanism 30 will be described below.

As described above, the conveying pipe 15 is constructed by continuously connecting a plurality of steel pipes by, for example, bolting. Among the steel pipes connected in this way, the lowermost one forming the lower end of the conveying pipe 15 is referred to as a "lower end pipe" and denoted by reference numeral "31". Further, the portion of the conveying pipe 15 excluding the lower end pipe 31 is referred to as a "conveying pipe main body" and denoted by reference numeral "33". In practice, the conveying pipe main body 33 is also configured by connecting a plurality of steel pipes, but in FIG. is doing.

The conveying pipe body 33 is fixed to the inner wall surface 105 of the shaft 101 and cannot be easily removed from the inner wall surface 105 . Specifically, the steel pipes forming the conveying pipe main body 33 are connected to each other in the vertical direction by bolting or the like, and part or all of the steel pipes are fixed to the inner wall surface 105 of the shaft 101 . On the other hand, the lower end pipe 31 is connected to the lower end of the conveying pipe main body 33 by bolting or the like, but is not fixed to the inner wall surface 105 of the shaft 101 . Therefore, the lower end tube 31 can be attached to and detached from the conveying tube body 33 relatively easily by attaching and detaching bolts.

Consider a state in which the lower end tube 31 is detached from the conveying tube main body 33, moved to a position deviated from the conveying tube main body 33 in a plan view, and moved upward. In this state, the carrier pipe 15 does not interfere with the lifting of the scaffold 3, and the scaffold 3 can also be lifted by a height corresponding to the length of the lower end pipe 31. Further, at this time, the lower end pipe 31 moved to a position shifted from the conveying pipe main body 33 in plan view may rise together with the scaffold 3 while being supported by the scaffold 3 .

Hereinafter, a method for excavating the shaft 101 will be described, including a specific method for realizing the above-described state and raising and retreating the lower end pipe 31 . Here, the case where the length of the lower end pipe 31 is 26 m and the depth of the excavated surface 103 collapsed by blasting is 1.3 m will be described as an example, but these dimensions are just an example and may be changed as appropriate. good.

Prior to blasting the excavated surface 103, the lower end pipe 31 and the scaffold 3 are raised and retracted by the following procedure. First, as shown in FIG. 3( a ), the capsule holding tube 29 at the first position P 1 is lifted by an elevating jack, and the upper end surface of the capsule holding tube 29 is brought into contact with the lower end surface of the lower end tube 31 . Then, the capsule holding tube 29 and the lower end tube 31 are connected by bolting. After that, as shown in FIG. 3(b), the bolts between the lower end tube 31 and the conveying tube body 33 are released, the capsule holding cylinder 29 is lowered by the lifting jack, and the lower end tube 31 is lifted from the conveying tube body. Remove from 33.

Next, as shown in FIG. 3(c), when the rotating plate 27 is rotated by 180°, the connected lower end tube 31 and capsule holding tube 29 move to the second position P2. As a result, the lower end tube 31 removed from the conveying tube main body 33 is moved to a position deviated from the conveying tube main body 33 in plan view, and is supported by the scaffold 3 (specifically, the capsule delivery section 21). As shown in FIG. 2(b), the stage 6 of the scaffold 3 has a shape with a notch, and the stage 6 rotates from the first position P1 to the second position P2. so as not to interfere with In this case, the lower end tube 31 only needs to be moved to a position where it does not overlap the conveying tube main body 33 in a plan view. It may be smaller than °.

By driving the hoist 11 (see FIG. 1) from the state of FIG. degree), and the scaffold 3 is retracted upward and away from the excavation surface 103 (see FIG. 1) (retraction step). At this time, the lower end tube 31 also rises together with the scaffold 3 (moving step). After that, the excavated surface 103 is blasted, and the excavated surface 103 is collapsed to a depth of about 1.3 m (blasting step). In this way, when the excavated surface 103 is blasted, the lower end pipe 31 and the scaffold 3 are retracted upward and away from the excavated surface 103, so the possibility of damage to the lower end pipe 31 and the scaffold 3 due to blasting is reduced. be.

When the scaffold 3 is retracted as described above, an extension tube 35 having a length of 1.3 m is connected to the upper end of the lower end tube 31 as shown in FIG. 3(d). The length (1.3 m) of the extension pipe 35 is set according to the depth (1.3 m) of the excavated surface 103 that collapses due to blasting. Next, as shown in FIG. 4(a), the hoist 11 (see FIG. 1) is driven and the scaffold 3 is lowered. Here, the scaffold 3 is lowered to a position 1.3 m below the position before the scaffold 3 is raised (see FIG. 3(c)). Next, as shown in FIG. 4(b), the rotating plate 27 rotates to move the extension tube 35, the lower end tube 31 and the capsule holding tube 29 to the first position P1. After that, as shown in FIG. 4(c), the capsule holding tube 29 at the first position P1 is lifted by the elevating jack, and the extension tube 35 and the transfer tube body 33 are connected by bolting or the like. Furthermore, the lower end tube 31 is separated from the capsule holding tube 29 by releasing the bolt connection between the lower end tube 31 and the capsule holding tube 29 and lowering the capsule holding tube 29 .

After that, the excavation muck generated on the excavation surface 103 by blasting is scooped up by the excavation arm 7 (see FIG. 1), and sequentially conveyed to the ground through the conveying pipe 15 by the conveying system 1, as described above. After almost all of the excavated muck on the excavated surface 103 has been carried out, the process returns to FIG.

Each time the steps of FIGS. 3(a) to 4(c) are repeated, excavation of the shaft 101 progresses by 1.3 m. At this time, when the drawn pipes 35 that have been repeatedly replenished reach a total length of 26 m, they may be replaced with a single steel pipe with a length of 26 m.

According to the transport system 1 and the excavation method using the same, when the excavation surface 103 is blasted, the lower end pipe 31 is retracted upward and away from the excavation surface 103 (see FIG. 3(d)). , the possibility of damage to the bottom tube 31 by blasting is reduced. Further, during blasting, the scaffold 3 is also retracted upward and away from the excavation surface 103 (see FIG. 3(d)), so the possibility of damage to the scaffold 3 due to blasting is reduced.

Also, if the transport pipe 15 were integrally fixed to the inner wall surface 105, the fixed transport pipe 15 would exist vertically above the capsule feeding section 21, and the transport pipe 15 would hinder the upward movement of the scaffold 3. can also be On the other hand, in this transport system 1, the transport pipe 15 is divided into a transport pipe body portion 33 fixed to the inner wall surface 105 of the shaft 101 and a transport pipe body portion 33 that is not fixed to the inner wall surface 105 of the shaft 101. and a detachable lower end tube 31 at the lower end. With this configuration, by removing the lower end tube 31 , it is possible to relatively easily prevent the carrier tube 15 from interfering with the upward movement of the scaffold 3 .

As a moving mechanism for moving the lower end pipe 31 detached from the conveying pipe main body 33 to a position deviated from the conveying pipe main body 33 in plan view and moving upward, as shown in FIGS. A moving mechanism may be employed.

As shown in FIG. 5, the moving mechanism 91 includes a slide portion 41 that slides vertically on the transfer pipe main body portion 33, and a telescopic cylinder 43 that is fixed to the transfer pipe main body portion 33 and moves the slide portion 41 up and down. I have. Further, the moving mechanism 91 includes a cylinder 45 fixed to the slide portion 41 and an arm 47 driven by the cylinder 45 and axially supported by the slide portion 41 . The lower end of arm 47 is rotatably connected to the upper end of lower end tube 31 .

As shown in FIG. 5(a), when the bolts between the conveying pipe main body 33 and the lower end pipe 31 are released and the cylinder 45 is driven, the lower end pipe 31 is moved to two points in the figure by the rotation of the arm 47. Move like a dashed line. That is, the lower end tube 31 detached from the conveying tube main body 33 is suspended from the slide section 41 via the arm 47 and moved to a position shifted from the conveying tube main body 33 in plan view. Become. From this state, as shown in FIG. 5B, when the slide portion 41 is pulled up by driving the cylinder 43, the slide portion 41 and the lower end tube 31 are raised together.

As shown in FIGS. 6A and 6B, the moving mechanism 93 includes a winch 49 instead of the cylinder 43 in the moving mechanism 91 as a power source for moving the slide portion 41 up and down. In this case, the slide portion 41 is lifted by the winch 49 being hoisted. Other mechanisms are the same as those of the moving mechanism 91 (see FIG. 5), so overlapping descriptions will be omitted.

As shown in FIG. 7 , the moving mechanism 95 includes a hoist 51 that is set above the lower end pipe 31 at a position offset from the conveying pipe main body 33 in plan view. As shown in FIG. 7(a), the upper end of the lower end pipe 31 is connected to the hoist 51 via the suspension wire 53, and the bolt connection between the conveying pipe main body 33 and the lower end pipe 31 is released. As shown in b), the lower end pipe 31 suspended from the hoist 51 is moved to a position deviated from the conveying pipe main body 33 in plan view. From this state, the lower end tube 31 is raised by driving the hoist 51 to wind up the suspension wire 53 .

As shown in FIG. 8, the moving mechanism 97 has guide rails 55 . The guide rail 55 extends vertically along the transport pipe 15 and is fixed to the outer peripheral surface of the transport pipe main body 33 . As shown in FIGS. 8(a) and 8(c), after the bolt connection between the conveying pipe body 33 and the lower end pipe 31 is released, the lower end pipe 31 is supported by the guide rails 55. It is rotated horizontally around the guide rail 55 . As a result, the lower end tube 31 is moved to a position deviated from the conveying tube main body 33 in plan view. After that, as shown in FIG. 8(b), the lower end tube 31 is lifted up by, for example, a hoist (not shown) and guided by the guide rails 55. As shown in FIG. In order to enable the operation as described above, a mechanism (not shown) that engages with the guide rail 55 and can horizontally rotate around the guide rail 55 is provided on the outer peripheral surface of the lower end tube 31. ing. As the guide rail 55 as described above, for example, H steel may be used.

As a moving mechanism for moving the lower end tube 31 upward with respect to the conveying tube body 33, a moving mechanism 99 illustrated in FIG. 9 may be used. In the moving mechanism 99, the lower end tube 31 and the carrier tube main body 33 are connected in a telescopic structure. The lower end pipe 31 is formed to have a slightly larger diameter than the conveying pipe main body portion 33 , and the lower end pipe 31 is inserted into the conveying pipe main body portion 33 by inserting the lower portion of the conveying pipe main body portion 33 inside the lower end pipe 31 . It is possible to move upward while remaining concentric with respect to it. In addition, as shown in FIG. 9B, the inner peripheral surface of the lower end tube 31 seals the gap from the outer peripheral surface of the transfer tube main body 33 and is slidable on the outer peripheral surface of the transfer tube main body 33. A hermetic seal 61 may be provided.

The present invention can be embodied in various forms with various modifications and improvements based on the knowledge of those skilled in the art, including the embodiment described above. Moreover, it is also possible to configure modifications of the embodiments by using the technical matters described in the above-described embodiments. You may use it, combining the structure of each embodiment suitably.

DESCRIPTION OF SYMBOLS 1... Conveyance system, 3... Scaffold (elevating platform), 15... Conveyance pipe, 17... Capsule (conveyance container), 21... Capsule sending part (container sending part), 27... Rotating plate, 30, 91, 93, 95 , 97, 99... Moving mechanism, 31... Lower end pipe, 33... Conveying pipe main body, 101... Vertical shaft, 103... Excavation surface, 105... Inner wall surface.

Claims (6)

A conveying system for conveying excavated muck to the outside of a shaft during excavation work by conveying a conveying container containing excavated waste in a shaft using air pressure in a conveying pipe provided in the shaft. ,
the conveying pipe having a conveying pipe main body portion fixed to the inner wall surface of the shaft; and a lower end pipe connected to the lower end of the conveying pipe main body portion and forming the lower end portion of the conveying pipe;
a container delivery unit provided on an elevating platform installed in the vertical shaft so as to be able to ascend and descend, and delivering the transport container into the transport pipe;
and a moving mechanism that moves the lower end pipe upward with respect to the main body of the conveying pipe. The lower end pipe is detachably attached to the lower end of the conveying pipe main body,
2. The conveying system according to claim 1, wherein said moving mechanism moves said lower end pipe removed from said conveying pipe main body to a position deviated from said conveying pipe main body in plan view and moves it upward. The moving mechanism is
3. The conveying system according to claim 2, wherein the lower end pipe is lifted together with the lifting frame while being supported by the lifting frame. The moving mechanism is
a rotary plate that horizontally rotates the container delivery unit on the lifting frame around an axis different from the pipe axis of the transfer pipe;
4. The conveying system according to claim 3, wherein the rotating plate is rotated in a state where the lower end pipe is fixed to the container delivery section, thereby moving the lower end pipe to a position deviated from the conveying pipe main body in a plan view. . A conveying system is used for conveying the excavated muck to the outside of the pit by pneumatically conveying a conveying container containing the excavated muck in the pit during excavation work in a conveying pipe provided in the pit. An excavation method for excavating the shaft by
The transport system is
the conveying pipe having a conveying pipe main body portion fixed to the inner wall surface of the shaft; and a lower end pipe connected to the lower end of the conveying pipe main body portion and forming the lower end portion of the conveying pipe;
a container delivery unit provided on an elevating platform installed in the vertical shaft so as to be able to ascend and descend, and delivering the transport container into the transport pipe;
a moving step of moving the lower end pipe upward with respect to the conveying pipe main body;
a retraction step of retracting the lifting frame upward;
and a blasting step of blasting an excavated surface of the vertical shaft in a state in which the elevating platform is retracted by the retracting step. In the moving step,
6. The excavation method according to claim 5, wherein the lower end pipe removed from the conveying pipe main body is moved to a position deviated from the conveying pipe main body in plan view and moved upward.

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