Outflow prevention jig

Abstract

To effectively prevent a fluid from flowing out from an end opening of a pipe.SOLUTION: An outflow prevention jig 10 prevents fluid from flowing out from an end opening of a pipe 30, and includes a fixed plate member 15 that can be fixed to the end of the pipe 30 via a pipe fitting 50, a sealing member 13 that is inserted into the pipe 30 to seal the pipe 30, and a support member 11 that supports the sealing member 13 on the fixed plate member 15.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to an outflow prevention jig, and particularly to a technique suitable for preventing a fluid from flowing out from an end opening of a pipe body.

Background Art

[0002] For example, Patent Document 1 discloses a rotary valve (pipe switching device) used for mountain tunnel construction or the like. The rotary valve functions to switch the pouring destination of fresh concrete by selectively communicating a concrete supply pipe through which fresh concrete is pumped from a concrete pump with any one of a plurality of concrete placing pipes.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The rotary valve includes a rotating disk provided with a supply port connected to a concrete supply pipe. The rotating disk is also provided with a plurality of cleaning ports for inserting a sponge or the like during cleaning of the concrete placing pipe. When the supply port communicates with any one of the plurality of concrete placing pipes, the cleaning ports communicate with the remaining concrete placing pipes through which fresh concrete is not being supplied.

[0005] In the conventional rotary valve, the opening of the cleaning port is in an open state where it is not blocked. Therefore, when switching the placement location of fresh concrete by rotating the rotating disk, the residual concrete in the concrete placement pipe where fresh concrete is not being supplied flows backward toward the cleaning port and leaks out from the opening of the cleaning port. Such leakage of residual concrete occurs even with ordinary concrete that has been conventionally used for lining in mountain tunnel construction, but it is more likely to occur significantly when placing medium-fluidity or high-fluidity concrete, which has become mainstream in recent years.

[0006] The concrete that has leaked from the cleaning port requires workers to clean it manually, resulting in the problem of expending labor on the cleaning work. Also, workers must move to the upper part of the center where the rotary valve is installed, raising concerns about risks such as the occurrence of injuries. Additionally, workers must interrupt other work for cleaning, raising concerns about affecting productivity. Moreover, the leaked concrete must be treated as industrial waste, resulting in the problem of increased treatment costs. Furthermore, as the quantity of concrete to be discarded increases, the total quantity of fresh concrete used in the construction also increases, leading to the problem of wasted labor costs.

[0007] To prevent the leakage of concrete from the cleaning port, it is conceivable to attach an opening and closing mechanism such as a shutter valve to the cleaning port. However, the shutter valve has a large-scale structure and high costs, making it unrealistic. Therefore, at the construction site, there is a demand for providing a technology with a simple structure that can prevent concrete from leaking from the cleaning port.

[0008] The technology of the present disclosure has been made in view of the above circumstances, and an object thereof is to provide a technology with a simple structure that can effectively prevent a fluid from flowing out from the end opening of a pipe body.

Means for Solving the Problem

[0009] The outflow prevention jig of the present disclosure is An outflow prevention jig (10) for preventing a fluid from flowing out of an end opening of a tube body (30), a fixing plate member (15) that can be fixed to the end via a pipe joint (50), a sealing member (13) inserted into the tube body (30) to seal the tube body (30), and a support member (11) that supports the sealing member (13) on the fixing plate member (15). It is characterized by this.

[0010] In the outflow prevention jig according to another aspect of the present disclosure, the support member (11) is a long bolt (11) having a male screw portion (11B), the sealing member (13) is attached to one end side of the long bolt (11), the fixing plate member (15) includes a first female screw portion (15E) that holds the other end side of the long bolt (11) by screwing into the male screw portion (11B) on the other end side of the long bolt (11), By rotating the long bolt (11) or the fixing plate member (15) and adjusting the screwing position between the male screw portion (11B) and the first female screw portion (15E), the insertion position of the sealing member (13) in the tube body (30) can be adjusted. This is desirable.

[0011] In the outflow prevention jig according to another aspect of the present disclosure, a first plate member (12) attached to one end of the long bolt (11), a second plate member (14) having a second female screw portion (14B) that screws into the male screw portion (11B) and is attached on the side opposite to the first plate member (12) with the sealing member (13) of the long bolt (11) interposed therebetween, and sandwiching the sealing member (13) between the first plate member (12) and the second plate member (14). The sealing member (13) is formed of an elastically deformable member, and by rotating the second plate member (14) or the long bolt (11) to adjust the screwing position between the male screw portion (11B) and the second female screw portion (14B), the amount of crushing of the sealing member (13) can be adjusted. This is desirable.

[0012] In the outflow prevention jig according to another aspect of the present disclosure, The tubular body (30) has an annular flange portion (37) on the outer periphery of the end portion. The fixed plate member (15) has an outer diameter equal to that of the flange portion (37) and includes an annular portion (15B) that is attached to the flange portion (37). The pipe joint (50) includes a pair of housings (51, 52) connected via a pin (53) and bolt nuts (54, 56) for tightening the housings (51, 52), and is a fastener that covers the outer peripheral surfaces of the annular portion (15B) and the flange portion (37) with the housings (51, 52). This is desirable.

[0013] In the outflow prevention jig according to another aspect of the present disclosure, The tubular body (30) is a pipe through which fresh concrete can flow as the fluid. The sealing member (13) is a sponge. This is desirable.

[0014] In the outflow prevention jig according to another aspect of the present disclosure, The outflow prevention jig (10) is A rotating disk (22) provided with a supply port (27) for supplying fresh concrete, a fixed disk (21) provided with a plurality of outlet ports (26) that selectively communicate with the supply port (27) as the rotating disk (22) rotates, and a cylindrical cleaning port (30) provided on the rotating disk (22) that communicates with the remaining other outlet ports (26) when one of the plurality of outlet ports (26) communicates with the supply port (27). The outflow prevention fixture according to the present embodiment is configured to be attachable to the opening-side end of the cleaning port (30). This is desirable.

[0015] In the above description, for the purpose of assisting the understanding of the present disclosure, reference numerals used in the embodiments are appended in parentheses to the constituent elements corresponding to the embodiments. However, each constituent element is not limited to the embodiments defined by the reference numerals.

Effects of the Invention

[0016] According to the technology of the present disclosure, with a simple structure, it is possible to effectively prevent the fluid from flowing out from the end opening of the pipe body.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0018] Hereinafter, based on the attached drawings, the outflow prevention jig according to this embodiment will be described.

[0019] [Overall Overview] FIG. 1 is a schematic construction cross-sectional view of a mountain tunnel construction using a rotary valve 20 to which an outflow prevention jig 10 according to this embodiment is attached. The rotary valve 20 is an example of the piping switching device of the present disclosure. In mountain tunnel construction, after spraying concrete on the excavation surface exposed by excavating the ground G, the lining concrete C is placed. For placing the lining concrete C, a center 1 (mobile formwork) is used.

[0020] The center 1 includes a gantry 3 as a workbench that can move on a pair of rails 2 laid in the tunnel axis direction on the ground of the tunnel. The gantry 3 is configured by joining a plurality of steel materials in a portal shape. The formwork 4 is a steel member formed in a semi-circular arc shape along the inner peripheral surface of the tunnel. The formwork 4 is supported by the gantry 3 via a jack 5 or the like. The lining concrete C is placed in the space between the sprayed concrete and the formwork 4.

[0021] The formwork 4 is provided with a plurality of concrete placing ports 6 for placing the lining concrete C. The concrete placing ports 6 include, for example, a top end top placing port 6A, a top end shoulder placing port 6B, a side wall placing port 6C, and the like. The downstream ends of the concrete placing pipes 7 are respectively connected to these concrete placing ports 6A, 6B, 6C. The upstream ends of the concrete placing pipes 7 are connected to a rotary valve 20 installed on the upper part of the gantry 3.

[0022] The downstream end of the concrete supply pipe 8 is connected to the rotary valve 20. The upstream end of the concrete supply pipe 8 is connected to a concrete pump 9 mounted on a concrete pump truck or the like. The concrete pump 9 pumps the fresh concrete supplied from an agitator truck or the like into the concrete supply pipe 8. The rotary valve 20 functions to selectively switch the fresh concrete pumped from the concrete pump 9 into the concrete supply pipe 8 to any one of a plurality of concrete placing pipes 7.

[0023] [Rotary Valve] FIG. 2 is a schematic perspective view of the rotary valve 20. Hereinafter, for convenience, the side to which the concrete supply pipe 8 of the rotary valve 20 is connected is referred to as the front side, and the side to which the concrete placing pipe 7 of the rotary valve 20 is connected is referred to as the rear side.

[0024] The rotary valve 20 mainly includes a fixed disk 21, a rotating disk 22, a base plate 23, and a drive device 24. The fixed disk 21 is a plate-shaped member and is fixed to the base plate 23 such that the plate surface is substantially perpendicular to the upper surface of the base plate 23. A shaft 25 for rotatably supporting the rotating disk 22 is provided on the front surface of the fixed disk 21. The front surface of the fixed disk 21 is in sliding contact with the rear surface of the rotating disk 22.

[0025] A plurality (four in this embodiment) of outlet ports 26 are provided on the same circumference centered on the shaft 25 on the rear surface of the fixed disk 21. The outlet port 26 is a cylindrical member. The concrete placing pipes 7 are respectively connected to the outlet ports 26. For the connection between the outlet port 26 and the concrete placing pipe 7, for example, a Victaulic joint (registered trademark) manufactured by Victaulic can be used.

[0026] On the outer periphery of the rotating disk 22, a driven sprocket 24C is provided. An endless chain 24D included in the drive device 24 is wound around the driven sprocket 24C. The drive device 24 includes a motor 24A as a drive source placed on the upper part of the base plate 23. A drive sprocket 24B around which the endless chain 24D is wound is attached to the output shaft of the motor 24A. When the motor 24A is driven, the rotational force of the motor 24A is transmitted from the drive sprocket 24B via the endless chain 24D to the driven sprocket 24C, so that the rotating disk 22 is configured to rotate about the shaft 25 as the axis. Although not shown, a chain cover that covers the outer periphery of the endless chain 24D is attached to the fixed disk 21.

[0027] On the front surface of the rotating disk 22, a plurality (four in this embodiment) of ports 27, 30 are provided on the same circumference centered on the shaft 25. Each of the ports 27, 30 is a cylindrical member. Among the plurality of ports 27, 30, one is a supply port 27. A concrete supply pipe 8 is connected to the supply port 27 via a connecting pipe 28. The connecting pipe 28 is a pipe that bends so as to connect the concrete supply pipe 8 and the supply port 27. The front end side of the connecting pipe 28 is rotatably supported by the base plate 23 via a support plate 28A. For example, a Victaulic joint (registered trademark) can be used for the connection between the connecting pipe 28 and the concrete supply pipe 8.

[0028] Among the plurality of ports 27, 30, the remaining three other than the supply port 27 are cleaning ports 30. In a state where the supply port 27 communicates with one outlet port 26, the three cleaning ports 30 are configured to communicate with the remaining three outlet ports 26 respectively. The cleaning port 30 is used when cleaning the inside of the concrete placing pipe 7.

[0029] When cleaning the inside of the concrete placing pipe 7, the downstream end of the concrete placing pipe 7 is disconnected from the aforementioned concrete placing port 6 (see FIG. 1). Next, a sponge having an outer diameter substantially the same as the inner diameters of the cleaning port 30 and the concrete placing pipe 7 is inserted into the cleaning port 30. After inserting the sponge, an air supply device is attached to the open end of the cleaning port 30, and compressed air is supplied from the cleaning port 30. The air supply device can be fixed to the cleaning port 30 using, for example, a Victaulic joint (registered trademark). When compressed air is supplied, the sponge pushes the residual concrete in the concrete placing pipe 7 toward the downstream end, thereby cleaning the inside of the concrete placing pipe 7.

[0030] Here, at a construction site such as a mountain tunnel construction, fresh concrete is placed from desired concrete placing ports 6A, 6B, 6C while appropriately switching the concrete placing pipe 7 that is the supply destination of the fresh concrete by means of the rotary valve 20. At this time, among the four concrete placing pipes 7, fresh concrete is pumped into one of the concrete placing pipes 7, while the remaining three concrete placing pipes 7 into which no fresh concrete is pumped are in a state of being in communication with the cleaning port 30. In the conventional cleaning port 30, the opening is always open, and when the residual concrete in the concrete placing pipe 7 into which no fresh concrete is pumped flows backward toward the upstream side, the residual concrete leaks out from the cleaning port 30.

[0031] For this reason, at the site, when switching the concrete placing pipe 7, there is a problem that at least one worker must be arranged near the rotary valve 20 and the worker must perform cleaning work such as scraping out the fresh concrete by hand from the cleaning port 30. Further, the residual concrete scraped out from the cleaning port 30 is put into a discharge pipe (not shown) provided on the base plate 23 and extending downward from the discharge port 29, but there is also a problem that the discharge pipe must be cleaned regularly. Further, the worker must move to the rotary valve 20 while ascending and descending inside the centor 1, and there is also a concern about risks such as the occurrence of injuries.

[0032] In addition, when the worker in charge of cleaning has other ongoing work, that work must be temporarily interrupted, and there are also issues such as affecting quality, processes, and productivity. Also, the leaked residual concrete must be treated as industrial waste, and there is an issue of increasing treatment costs. Furthermore, there may be cases where wasteful residual concrete that must be discarded is generated at a rate of 1 m 3 weak, and there is also an issue of increasing labor costs due to an increase in the total quantity of fresh concrete used.

[0033] In this embodiment, in order to solve these problems, an outflow prevention fixture for preventing the leakage of concrete is attached to the opening end of the cleaning port 30. The details of the outflow prevention fixture will be described below.

[0034] [Outflow Prevention Fixture] FIG. 3 is a schematic cross-sectional view showing a state in which the outflow prevention fixture 10 according to this embodiment is attached to the cleaning port 30. FIG. 4 is a schematic perspective view showing the outflow prevention fixture 10 according to this embodiment.

[0035] As shown in FIG. 3, the cleaning port 30 has a cylindrical main body side pipe portion 31 and an upstream side pipe portion 35 formed in a cylindrical shape having the same diameter as the main body side pipe portion 31. The downstream end of the main body side pipe portion 31 is joined to the rotating disk 22 by welding or the like. A first flange portion 32 is provided at the upstream end of the main body side pipe portion 31. A second flange portion 36 is provided at the downstream end of the upstream side pipe portion 35. The upstream side pipe portion 35 is attached to the main body side pipe portion 31 by fastening the second flange portion 36 to the first flange portion 32 with bolts and nuts. An annular flange portion 37 smaller than the second flange portion 36 is provided at the upstream end of the upstream side pipe portion 35. The outflow prevention fixture 10 is attached to the flange portion 37 using a Victaulic joint 50 (registered trademark).

[0036] The Victaulic joint 50 is a pipe joint for connecting a pipe body with a flange or the like. Since the Victaulic joint 50 itself is well-known, it will be briefly described below.

[0037] FIG. 5 is a schematic front view showing a Victaulic joint 50. The Victaulic joint 50 has a pair of semi-circular arc-shaped housings 51 and 52. Recesses 51A and 52A for accommodating the flange portions of the pipe ends are respectively provided on the inner circumferences of the housings 51 and 52. Connecting pieces 51B and 52B are integrally provided at one end of the housings 51 and 52. Clamping pieces 51C and 52C are integrally provided at the other end of the housings 51 and 52. The connecting pieces 51B and 52B are hingedly connected to each other via a pin 53. That is, each housing 51 and 52 can rotate about the pin 53 as a fulcrum.

[0038] A bolt 54 is swingably attached to the lower clamping piece 52C via a rivet pin 55. When connecting the pipes, first, the housings 51 and 52 are covered over the butted flange portions, and the flange portions are accommodated in the recesses 51A and 52A. After accommodating the flange portions, the bolt 54 is inserted into the upper clamping piece 51C, and a nut 56 is screwed onto the bolt 54, so that the pipes can be easily connected.

[0039] Referring again to FIGS. 3 and 4, the details of the outflow prevention jig 10 will be described. The outflow prevention jig 10 includes a long support bolt 11 (long bolt). The support bolt 11 is an example of the support member of the present disclosure. The axial length of the support bolt 11 is formed to be longer than the axial length of the cleaning port 30 in the pipe axis direction. A nut 11A as a head is fixed to one end (base end) of the support bolt 11 by welding or the like. An end plate 12, a sponge member 13, an adjustment plate 14, a lock plate 15, and a holding nut 16 are attached to the male screw portion 11B of the support bolt 11 in order from the tip side (downstream side).

[0040] The end plate 12 is an example of the first plate member of the present disclosure, and is formed in a disc shape with a smaller diameter than the inner diameter of the pipe of the cleaning port 30. The end plate 12 functions to sandwich the sponge member 13 between the adjustment plate 14. A nut 12A is fixed to the center of the circle of the end plate 12 by welding or the like. The end plate 12 is detachably attached to the tip of the support bolt 11 by screwing the nut 12A onto the male screw portion 11B at the tip of the support bolt 11. When cleaning or replacing the sponge member 13, the end plate 12 is removed from the support bolt 11 so that the sponge member 13 can be easily removed from the support bolt 11.

[0041] The sponge member 13 is an example of the sealing member of the present disclosure, and is formed in a substantially cylindrical shape. A through hole 13A penetrating the sponge member 13 in the axial direction is provided at the center of the circle of the sponge member 13. The sponge member 13 is attached to the support bolt 11 by inserting the support bolt 11 into the through hole 13A. The outer diameter of the sponge member 13 is formed to be the same as the inner diameter of the pipe of the cleaning port 30 or slightly larger than the inner diameter of the pipe. When the sponge member 13 is inserted into the cleaning port 30, the outer peripheral surface of the sponge member 13 comes into close contact with the inner peripheral surface of the cleaning port 30, thereby preventing the outflow of concrete.

[0042] The adjustment plate 14 is an example of the second plate member of the present disclosure, and is attached to a portion on the opposite side of the end plate 12 with the sponge member 13 sandwiched between the support bolts 11. The adjustment plate 14 is formed of a substantially X-shaped plate material and functions to adjust the amount of compression of the sponge member 13 sandwiched between the adjustment plate 14 and the end plate 12.

[0043] A through-hole 14A for inserting a support bolt 11 is provided at the center of the adjustment plate 14. Further, a nut 14B is fixed concentrically with the through-hole 14A at the center of the adjustment plate 14 by welding or the like. The nut 14B is an example of the second female screw portion of the present disclosure. The adjustment plate 14 is detachably attached to the support bolt 11 by screwing the nut 14B onto the male screw portion 11B of the support bolt 11.

[0044] When the adjustment plate 14 is rotated clockwise (right-handed) as viewed from the lock plate 15 side, the screwing position between the nut 14B and the male screw portion 11B moves toward the end plate 12 side. That is, when the adjustment plate 14 moves toward the end plate 12 side, the amount of compression of the sponge member 13 increases. Increasing the amount of compression of the sponge member 13 can increase the density of the sponge member 13. Furthermore, as the sponge member 13 expands in the radial direction, the degree of closeness between the outer peripheral surface of the sponge member 13 and the inner peripheral surface of the cleaning port 30 can be increased. For example, when using medium-fluidity or high-fluidity concrete, by increasing the amount of compression of the sponge member 13 and increasing the density of the sponge member 13, leakage of the concrete can be more effectively prevented.

[0045] The lock plate 15 is an example of the fixed plate member of the present disclosure and functions to fix the support bolt 11 to the cleaning port 30. Specifically, the lock plate 15 has a disk-shaped plate body portion 15A and an annular portion 15B provided on the outer periphery of the plate body portion 15A. The annular portion 15B of the lock plate 15 is formed with substantially the same outer diameter as the flange portion 37 provided in the cleaning port 30. That is, with the annular portion 15B attached to the flange portion 37, the outer peripheral surfaces of the annular portion 15B and the flange portion 37 are covered with the housings 51, 52 of the aforementioned Victaulic joint 50 and fastened, so that the lock plate 15 is attached to the open end of the cleaning port 30.

[0046] The plate main body 15A is formed with a plurality (two in the illustrated example) of lightening holes 15C (see FIG. 4) for reducing weight. A through hole 15D for inserting the support bolt 11 is provided at the center of the plate main body 15A. Further, a nut 15E is fixed to the front surface of the plate main body 15A concentrically with the through hole 15D by welding or the like. The nut 15E is an example of the first female screw portion of the present disclosure. The lock plate 15 is detachably attached to the support bolt 11 by screwing the nut 15E onto the support bolt 11.

[0047] An annular guide projection 15F is provided on the rear surface of the plate main body 15A. The outer diameter of the guide projection 15F is formed to be substantially equal to the inner diameter of the tube of the cleaning port 30. A tapered surface 15G that inclines from the plate main body 15A side toward the axis is provided on the outer periphery of the guide projection 15F. When attaching the lock plate 15 to the cleaning port 30, the tapered surface 15G abuts against the inner peripheral edge of the cleaning port 30, enabling easy positioning of the lock plate 15.

[0048] The lock plate 15 and the support bolt 11 also function to adjust the insertion positions of the sponge member 13 and the end plate 12 in the cleaning port 30. Specifically, when the support bolt 11 is rotated counterclockwise (left-handed) with the lock plate 15 viewed from the front side, the screwing position of the nut 15E and the male screw portion 11B moves toward the end plate 12 side. That is, as the sponge member 13 and the end plate 12 approach the lock plate 15, the insertion positions of the sponge member 13 and the end plate 12 can be adjusted forward. On the other hand, when the support bolt 11 is rotated clockwise (right-handed) with the lock plate 15 viewed from the front side, the screwing position of the nut 15E and the male screw portion 11B moves away from the end plate 12 side. That is, as the sponge member 13 and the end plate 12 move away from the lock plate 15, the insertion positions of the sponge member 13 and the end plate 12 can be adjusted backward.

[0049] Here, if there is a large space downstream of the sponge member 13 in the cleaning port 30, residual concrete that has flowed back may accumulate in the space and harden over time. When the residual concrete hardens, the hardened concrete in the cleaning port 30 must be removed when using the cleaning port 30. For this reason, it is desirable to install the sponge member 13 near the downstream end in the cleaning port 30.

[0050] In the present embodiment, the support bolt 11 is formed longer than the axial length of the cleaning port 30 in the pipe axis direction. For this reason, if the support bolt 11 is rotated by an appropriate amount, the rear surfaces of the end plate 12 and the sponge member 13 can be positioned near the downstream end of the cleaning port 30. That is, it is configured to effectively prevent residual concrete from flowing into the cleaning port 30 and hardening.

[0051] The holding nut 16 functions as a so-called double nut with the nut 15E provided in the lock plate 15. After positioning the end plate 12 and the sponge member 13 at a desired position, by tightening the holding nut 16, the end plate 12 and the sponge member 13 can be held at the desired position.

[0052] According to the present embodiment described in detail above, the outflow prevention jig 10 is mainly configured with a simple structure including the support bolt 11, the sponge member 13, and the lock plate 15. Thereby, for example, compared with the case where a large-scale opening and closing mechanism such as a shutter valve is provided in the cleaning port 30, the cost can be effectively reduced. That is, it is possible to realize prevention of outflow of residual concrete from the cleaning port 30 at low cost.

[0053] Further, according to the outflow prevention jig 10 of the present embodiment, the sealing member that seals the inside of the cleaning port 30 is formed by the sponge member 13. Thereby, for example, compared with the case of using an iron valve body or the like, it is possible to effectively reduce the weight. That is, the attachability and detachability at the site can be surely improved.

[0054] Further, according to the outflow prevention jig 10 of the present embodiment, by rotating the support bolt 11, the insertion position of the sponge member 13 in the cleaning port 30 can be adjusted. Thereby, the sponge member 13 can be positioned near the downstream end in the cleaning port 30, and it is possible to surely prevent the residual concrete from flowing into the cleaning port 30 and further prevent the cleaning port 30 from being blocked due to the hardening of the residual concrete.

[0055] In addition, by attaching the outflow prevention jig 10 of the present embodiment to the cleaning port 30, it is possible to surely prevent the residual concrete from leaking from the cleaning port 30 when the piping is switched by the rotary valve 20. By preventing the leakage of the residual concrete, it is possible to omit the cleaning work near the rotary valve 20. In addition, since it is not necessary to arrange workers for the cleaning work, it is possible to prevent the temporary interruption of other work of the workers, and it is also possible to improve the quality, process, and productivity. In addition, it is not necessary for the worker to move to the upper part of the center 1 for cleaning, and it is also possible to improve the safety. In addition, the processing cost of the concrete to be discarded can be suppressed, and further, since the number of times of cleaning the discharge pipe can be reduced, it is possible to streamline the processing work. In addition, by reducing the wasted concrete, the total quantity of the fresh concrete to be placed can also be reduced, and it is also possible to surely suppress the labor cost.

[0056] [Others] Note that the present disclosure is not limited to the above-described embodiments, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

[0057] For example, in the above embodiment, the sealing member was described using the sponge member 13. However, any elastic member such as resin may be used as long as it can seal the inside of the cleaning port 30. Also, as shown in FIG. 6, the sealing member can be configured by providing an O-ring 131 or the like that presses against the inner peripheral surface of the cleaning port 30 on the outer periphery of a columnar valve body 130 having a smaller diameter than the inner diameter of the tube of the cleaning port 30. In this case, the material forming the valve body 130 is not particularly limited as long as it can block the flow of the fluid. Also, the end plate 12 and the adjustment plate 14 are not necessary.

[0058] Also, the support member is not limited to the long support bolt 11 (long bolt). Any member such as a rod may be used as long as it can support the sponge member 13 on the lock plate 15. Also, it is possible to configure the structure such that the sponge member 13 is directly supported on the back surface of the lock plate 15.

[0059] Also, the pipe joint for attaching the lock plate 15 is not limited to the Victaulic joint 50 (registered trademark). Any other pipe joint may be used as long as it has a structure that can fix the lock plate 15 to the flange portion 37 of the cleaning port 30. Also, in the above embodiment, the site where the rotary valve 20 is used was described by taking mountain tunnel construction as an example. However, it may be any other site where the rotary valve 20 is used, such as the lining construction of a shield tunnel. Also, the outflow prevention jig 10 of the present disclosure is not limited to the cleaning port 30 of the rotary valve 20, and can be widely applied to other concrete pipes through which fresh concrete flows, or other pipe bodies through which fluids other than fresh concrete (for example, mortar, grout, etc.) can flow.

Description of Reference Numerals

[0060] 10…Outflow prevention jig, 11…Support bolt (support member), 11A…Nut, 11B…Male screw portion, 12…End plate (first plate member), 12A…Nut, 13…Sponge member (sealing member), 13A…Through hole, 14…Adjustment plate (second plate member), 14A…Through hole, 14B…Nut (second female screw portion), 15…Lock plate, 15A…Plate main body portion, 15B…Annular portion, 15D…Through hole, 15E…Nut (first female screw portion), 20…Rotary valve (pipe switching device), 21…Fixed plate, 22…Rotating plate, 23…Base plate, 24…Drive device, 24A…Motor, 24B…Drive sprocket, 24C…Driven sprocket, 24D…Endless chain, 25…Shaft, 26…Outlet port, 27…Supply port, 28…Connecting pipe, 29…Discharge port, 30…Washing port, 31…Main body side pipe portion, 32…First flange portion, 35…Upstream side pipe portion, 36…Second flange portion, 37…Flange portion, 50…Victaulic joint (pipe joint), 51, 52…Housing, 51A, 52A…Recess, 51B, 52B…Connecting piece, 53…Pin, 51C, 52C…Tightening piece, 54…Bolt, 55…Rivet pin, 56…Nut, 7…Concrete placing pipe, 8…Concrete supply pipe

Claims

1. An outflow prevention fixture for preventing a fluid from flowing out of an end opening of a pipe body, comprising: a fixing plate member that can be fixed to the end via a pipe joint; a sealing member inserted into the pipe body to seal the pipe body; a support member that supports the sealing member on the fixing plate member. The outflow prevention fixture.

2. The outflow prevention fixture according to Claim 1, wherein: the support member is a long bolt having a male thread portion; the sealing member is attached to one end side of the long bolt; the fixing plate member is provided with a first female thread portion that engages with the male thread portion on the other end side of the long bolt to hold the other end side of the long bolt; by rotating the long bolt or the fixing plate member to adjust the screwing position between the male thread portion and the first female thread portion, the insertion position of the sealing member in the pipe body can be adjusted. The outflow prevention fixture.

3. The outflow prevention fixture according to Claim 2, further comprising: a first plate member attached to one end of the long bolt; a second plate member having a second female thread portion that engages with the male thread portion, attached on the side opposite to the first plate member with the sealing member of the long bolt interposed therebetween, and sandwiching the sealing member between the first plate member and the second plate member; the sealing member is formed of an elastically deformable member, and by rotating the second plate member or the long bolt to adjust the screwing position between the male thread portion and the second female thread portion, the amount of compression of the sealing member can be adjusted. The outflow prevention fixture.

4. The outflow prevention fixture according to Claim 1 or 2, wherein: the pipe body is provided with an annular flange portion on the outer periphery of the end; the fixing plate member has an outer diameter equal to that of the flange portion and is provided with an annular portion that fits with the flange portion; the pipe joint includes a pair of housings connected via pins and a bolt nut for tightening the housings, and is a fastener in which the housings are covered so as to cover the outer peripheral surfaces of the annular portion and the flange portion. The outflow prevention fixture.

5. The outflow prevention fixture according to Claim 1 or 2, wherein: the pipe body is a pipe through which fresh concrete can flow as the fluid; the sealing member is a sponge. The outflow prevention fixture.

6. The outflow prevention fixture according to Claim 5, wherein: the outflow prevention fixture is A rotating disk provided with a supply port for supplying fresh concrete, a fixed disk provided with a plurality of outlet ports that selectively communicate with the supply port as the rotating disk rotates, and a cleaning port provided on the rotating disk and having a cylindrical shape that communicates with the remaining other outlet ports in a state where one of the plurality of outlet ports communicates with the supply port. The outflow prevention jig is configured to be attachable to the opening side end of the cleaning port of the pipe switching device thus configured. Outflow prevention jig.

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