JP6746231B2 - Mud pipe equipment for muddy excavators - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mud pipe equipment for a muddy water excavator, and relates to, for example, a technique for replacing a worn portion of a mud pipe of a muddy water shield machine.

The muddy water shield machine excels in stabilizing the cutting face by supplying muddy water through the mud pipe into the muddy water chamber behind the cutter board to apply mud pressure to the cutting face and drain the muddy water accumulated in the muddy water chamber. It is an excavator that advances excavation work while discharging it to the outside of the tunnel. In addition, the technology related to the mud discharge pipe of the muddy water shield machine is disclosed in Patent Document 1, for example.

JP, 2005-086535, A

Incidentally, in a muddy water shield machine for excavating a gravel layer or the like, gravel or the like flowing in the mud pipe may cause wear such as a hole in the mud pipe. If the frequency of wear of the sludge pipe is high, a replacement pipe that matches the size of the worn pipe must be processed and replaced with the worn pipe. However, in this case, since the replacement pipe has a ready-made length including a portion that is not worn, the processing work is time-consuming and labor-intensive work. Also, the replacement work is a troublesome work that requires time and labor because long replacement pipes must be carried to the replacement location in the tunnel and a plurality of workers must cooperate in the replacement in the narrow tunnel. ing. In particular, the problem of this replacement work becomes more serious as the tunnel becomes longer. Since excavation work must be interrupted during the replacement work of the sludge pipe, the excavation work will be delayed.

The present invention has been made from the above technical background, and an object thereof is to provide a technique capable of shortening the replacement time of a worn portion in a mud discharge pipe for a muddy water excavator. And

In order to solve the above-mentioned problems, the mud discharge pipe equipment for a mud excavator of the present invention according to claim 1 conveys mixed mud water of mud in the chamber of the mud excavator and excavated earth and sand to the outside of the tunnel. Plural curved pipes provided at positions where the path is bent in the middle of the sludge discharge pipe made of steel, direct pipes provided between each of the plural curved pipes, and replacement pipe parts made in advance And the direct pipe is detachably provided immediately downstream of the curved pipe, and a residual pipe portion is detachably provided downstream of the exchange pipe. And the replacement piping part is replaceable with the replacement piping part and can be mounted, and the replacement piping part in which the inside of the pipe is worn can be replaced with the replacement piping part. And
Further, the present invention according to claim 2 is the mud discharge pipe facility for a mud excavator according to claim 1, wherein the length of the replacement pipe portion is shorter than the length of the residual pipe portion. Is characterized by.

Further, the present invention according to claim 3 is the sludge discharge pipe facility for a muddy water excavator according to claim 1 or 2 , wherein a plurality of the direct pipes are set to have the same predetermined length. Characterize.

Further, the present invention according to claim 4 is the mud pipe equipment for a mud excavator according to any one of claims 1, 2 and 3 , wherein the replacement pipe portion is provided in the mud pipe in the tunnel. It is characterized by being provided.

Further, the present invention according to claim 5 is the drainage pipe facility for a muddy water excavator according to any one of claims 1 to 4 , wherein the length of the replacement pipe portion is equal to or larger than the plurality of pipes. Of the bent pipes, the bent pipes are bent 90 degrees, and are set according to the downstream wear range of the bent pipes.

Further, the present invention according to claim 6 is the drainage mud pipe facility for a muddy water excavator according to any one of claims 1 to 5 , wherein the replacement pipe portion has a length of 30 cm to 60 cm. Is characterized in that

According to the first aspect of the present invention, when exchanging the worn part of the mud discharge pipe for the muddy water excavator , the exchanging pipe part may be exchanged with the exchanging pipe part, so that the exchanging time can be shortened. It will be possible.
According to the second aspect of the present invention, since the relatively short replacement pipe portion may be replaced, the replacement work can be facilitated.

According to the invention as set forth in claim 3 , for example, by preparing a plurality of replacement piping parts prepared in advance at a plurality of positions of the mud discharge pipe for the mud excavator, Since it is possible to omit processing and transportation of the replacement pipe portion during the replacement work, it is possible to shorten the replacement time of the worn part of the sludge discharge pipe.

According to the invention of claim 4 , since the replacement pipe portion is relatively short, it is possible to facilitate the replacement work of the worn portion of the sludge discharge pipe even in a narrow tunnel, and shorten the replacement time. Will be possible.

According to the invention of claim 5 , wear is likely to occur in the straight pipe downstream of the bent pipe bent at 90 degrees. Therefore, by setting the length of the replacement pipe portion in accordance with the wear range, the sludge drainage is set. It becomes possible to cope with wear at any position of the pipe.

According to the invention of claim 6, the length of the replacement pipe portion is set to a length including the worn portion of the sludge discharge pipe, and is set to a length that is easy to handle during processing, transportation, replacement work and the like. Therefore, it is possible to facilitate the pre-processing and transportation work of the replacement piping portion, and also facilitate the replacement work of the replacement piping portion.

It is a principal part block diagram of an example of the shield machine according to one embodiment of the present invention. It is a principal part top view of an example of the sludge pipe|tube around a sludge pump in the tunnel behind the shield machine of FIG. It is a principal part side view of the sludge discharge pipe of FIG. It is a principal part enlarged side view which extracted and showed some mud discharge pipes of FIG. It is a principal part expanded side view of the general mud pipe which does not employ the structure of the mud pipe of this Embodiment. FIG. 6A is an enlarged side view of an essential part of the mud discharge pipe during the replacement work of the replacement piping part, and FIG. 6B is an enlarged side view of the essential part of the mud discharge pipe during the replacement work of the replacement pipe part. , (C) is an enlarged side view of the main part of the sludge discharge pipe during the replacement work of the replacement piping part following FIG. 6(b).

Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. In addition, in the drawings for describing the embodiments, the same components are denoted by the same reference symbols in principle, and repeated description thereof will be omitted.

First, a configuration example of the shield machine of the present embodiment will be described with reference to FIG. FIG. 1 is a main part configuration diagram of an example of a shield machine according to the present embodiment.

The shield machine 1 of the present embodiment, when excavating the natural ground by pressing the cutter head 2 against the cutting face and rotating it, sends the cutter head 2 to the muddy water chamber 4 provided in the device body 3 behind the cutter head 2. The mud is pumped through the mud pipe 5, the mud pressure in the mud chamber 4 is adjusted to a pressure commensurate with the earth pressure and the groundwater pressure of the face to stabilize the face, and the mud accumulated in the muddy chamber 4 is drained. It is a mud-type shield machine that forms a tunnel in the ground while discharging it outside the tunnel.

The cutter head 2 that constitutes the shield machine 1 is a front circular excavating member that excavates a natural face, and is rotatable in the forward and reverse directions on the front surface of the device body 3 along the circumferential direction of the device body 3. It is installed in the state. The cutter head 2 is, for example, of a spoke type, and a plurality of bits 2a and scraper teeth 2b for crushing cobblestones or excavating the ground are mounted on the front surface (the surface facing the face). In addition, a through hole (not shown) for taking in earth and sand excavated by the rotation of the cutter head 2 into the muddy water chamber 4 is formed. A copy bit 2c is mounted on the outer peripheral surface of the cutter head 2 for controlling a surplus during construction of a sharp curve, posture control of the shield machine 1, and the like.

The front body plate 3a and the rear body plate 3b forming the device body 3 of the shield machine 1 are formed of, for example, a cylindrical steel plate. The front body plate 3a and the rear body plate 3b are engaged with each other by being inserted while the spherical bearing portion on the front end side of the rear body plate 3b is in contact with the inner peripheral surface on the rear end side of the front body plate 3a. .. Behind the rear body plate 3b, a tail seal 3c is provided along the inner circumference of the rear body plate 3b to prevent groundwater and the like from entering the equipment body 3 from the rear portion of the body 3 during excavation work. It is provided.

On the front side of the front body plate 3a, a partition 7 is installed at a position retracted from the front side to the inside of the device body 3 to divide the inside of the device body 3 into a face side and a machine side. The mud chamber 4 is provided on the face side of the device body 3, that is, between the cutter head 2 and the partition wall 7. The muddy water chamber 4 is a space (chamber) that takes in the earth and sand excavated by the rotation of the cutter head 2 and mixes it with the muddy water supplied through the mud pipe 5.

On the other hand, a cutter driving body 10, a plurality of middle-breaking jacks 11a, a plurality of shield jacks 11b, an erector 12, a mud sending pipe 5, and a mud discharging pipe 6 are installed inside the device body 3. Has been done.

The cutter driving body 10 is a drive source that rotates the cutter head 2 in forward and reverse directions. The center folding jack 11a is a device that connects the front body plate 3a and the rear body plate 3b and corrects the propulsion direction of the shield machine 1. The shield jack 11b is a device that generates a propulsive force for advancing the shield machine 1 by applying a reaction force to the segment SG laid on the inner periphery of the tunnel behind the device body 3. The erector 12 is a device that assembles the segment SG on the inner circumference of the excavated tunnel. The segment SG is made of, for example, a flat concrete segment or a composite segment (composite structure of concrete and steel), and is installed in a state of being arranged in a plurality along the circumferential direction and the axial direction of the tunnel.

The mud feed pipe 5 is a pipe for supplying mud water into the mud chamber 4, and is made of, for example, a steel material. The tip portion (mud discharge port) of the mud delivery pipe 5 penetrates the inside upper part of the front surface of the partition wall 7 and reaches the muddy water chamber 4. As a result, the muddy water pressure-fed through the muddy water pipe 5 is supplied into the muddy water chamber 4 from the upper front inside of the shield machine 1. On the other hand, the rear end of the mud transport pipe 5 extends toward the tunnel mouth, and a plurality of mud pumps (not shown) arranged at predetermined intervals on the way are used to form a mud layer outside the tunnel. (Not shown). The muddy water tank is connected to a muddy water treatment device (not shown) outside the tunnel.

The mud discharge pipe 6 is a pipe for discharging the discharged mud water (mixed mud of excavated earth and mud) in the mud chamber 4 to the outside of the tunnel, and is made of, for example, a steel material. The tip portion (mud suction port) of the mud discharge pipe 6 penetrates the inside lower part of the front surface of the partition wall 7 and reaches the muddy water chamber 4. As a result, the discharged mud water in the mud chamber 4 is discharged from the lower front inside of the shield machine 1. On the other hand, the rear end portion of the sludge pipe 6 extends toward the tunnel mouth, and is connected to the tunnel through a plurality of sludge pumps (not shown in FIG. 1) arranged at predetermined intervals on the way. It is connected to the external muddy water treatment device. That is, the discharged sludge in the sludge chamber 4 is sent to the sludge treatment device outside the tunnel through the sludge pipe 6, where it is separated into sediment and muddy water to adjust the specific gravity and viscosity, and then sent to the sludge tank. And is sent again to the muddy water chamber 4 (cutting face) through the mud sending pipe 5.

Next, a configuration example of the sludge discharge pipe 6 of the shield machine 1 will be described with reference to FIGS. 2 to 4. 2 is a plan view of a main part of an example of the sludge pipe around the sludge pump in the tunnel behind the shield machine shown in FIG. 1, FIG. 3 is a side view of the main part of the sludge pipe of FIG. 2, and FIG. FIG. 3 is an enlarged side view of a main part showing a part of the sludge discharge pipe shown in FIG. 2 to 4, the left side is the face of the tunnel (shield excavator 1) side, and the right side is the tunnel side (vertical shaft) side.

As shown in FIGS. 2 and 3, a sludge pump Pd is connected in the middle of the sludge pipe 6. The sludge pump Pd is a pump for pumping sludge water in the sludge pipe 6 to the outside of the tunnel T. The sludge discharge pipe 6 around the sludge pump Pd has many bent portions in the vertical and horizontal directions. In the figure, the symbol W indicates a water injection device, the symbol S indicates a starter panel, and the arrow Ad indicates the direction in which the discharged sludge flows.

The sludge discharge pipe 6 has a plurality of curved pipes 6a (6a1, 6a2), direct pipes 6b (6b1 to 6b5), and a joint 6c. The bent pipe 6a is detachably provided at a position where the path of the sludge discharge pipe 6 is bent. Of the curved pipes 6a, the curved pipes 6a1 are formed so as to bend the path around 45 degrees, and the curved pipes 6a2 are formed so as to bend the path around 90 degrees. The bending angle of the bent pipe 6a is not limited to the above-mentioned angle, but various angles are possible.

The straight pipes 6b (6b1 to 6b5) are detachably provided between the curved pipes 6a and 6a while extending along the line connecting the curved pipes 6a and 6a adjacent to each other. The axial length (total length) of the direct pipe 6b is not unified and is determined by the location of the sludge discharge pipe 6. For example, as shown in FIG. 4, the axial length (total length) L1 of the direct piping 6b3 and the axial length (total length) L2 of the direct piping 6b4 are different. Of the direct piping 6b, the direct piping 6b3 to 6b5 includes a replacement piping portion 6be and a residual piping portion 6bu (6bu1 to 6bu3).

The replacement pipe portion 6be is a pipe portion that is scheduled to be replaced, and is detachably installed immediately downstream of the curved pipe 6a. The axial length L3 (see FIG. 4) of each exchange piping portion 6be of all the direct piping 6b is a predetermined length shorter than the total length of each of the direct piping 6b (6b3 to 6b5) and the residual piping portion 6bu. Is unified. That is, all the replacement piping portions 6be have the same length. The axial length L3 of the replacement pipe portion 6be is a length including a range of wear exceeding an allowable range that occurs in the straight pipe 6b downstream of the curved pipe 6a2, and is used during processing, transportation, exchange work, or the like. The length is set to be easy to handle. Regarding the setting of the length related to wear, for example, among the plurality of bent pipes 6a, wear is likely to occur in the straight pipe 6b downstream of the bent pipe 6a2 bent at 90 degrees, so that the length is set according to the wear range. There is. As a result, it is possible to deal with wear at any position of the sludge discharge pipe 6. From the above viewpoints, the axial length of the replacement piping portion 6be (that is, the predetermined length L3) is shorter than the ready-made product, for example, 30 cm to 60 cm, specifically, set to about 50 cm, for example. Has been done.

The remaining piping portion 6bu (6bu1 to 6bu3) of the direct piping 6b is detachably installed immediately downstream of the replacement piping portion 6be. The axial length (overall length) of the residual pipe portion 6bu is not uniform and is determined by the location of the sludge pipe 6. For example, as shown in FIG. 4, the axial length L4 of the residual piping portion 6bu1 and the axial length L5 of the residual piping portion 6bu2 are different. However, the axial length of the residual piping portion 6bu is shorter than the total length of each straight piping 6b in which the residual piping portion 6bu is arranged, and longer than the axial length of the replacement piping portion 6be. In addition, although the case where one residual pipe portion 6bu is formed by one pipe is illustrated here, the present invention is not limited to this, and one residual pipe portion 6bu connects a plurality of pipes with the joint 6c. It may be configured by connecting them together.

The joint 6c is a member that mechanically connects the curved pipe 6a and the direct pipe 6b (the replacement pipe portion 6be and the residual pipe portion 6bu) in a detachable state, and includes the curved pipe 6a and the direct pipe 6b (the replacement pipe portion). 6be and the residual piping portion 6bu) are mounted between the adjacent portions.

Here, FIG. 5 shows an enlarged side view of essential parts of a general sludge pipe 50 which does not adopt the configuration of the sludge pipe 6 of the present embodiment. In this case, it is necessary to process a replacement pipe suitable for the size of the worn straight pipe 50b and replace the entire straight pipe 50b. However, since this replacement pipe has a ready-made length including a portion without wear and tear, the processing work is a troublesome work requiring time and labor. Also, the replacement work is a troublesome work that requires time and labor because long replacement pipes must be carried to the replacement location in the tunnel and a plurality of workers must cooperate in the replacement in the narrow tunnel. ing. The problem of this replacement work becomes more serious as the tunnel becomes longer. Since the excavation work must be interrupted during this replacement work, the excavation work will be delayed.

On the other hand, in the muddy-water shield machine 1 for excavating a gravel layer or the like, the gravel or the like in the waste mud water flowing in the sludge pipe 6 easily collides with the inner wall of the sludge pipe 6, so There is a case where wear such as a hole may occur, but according to the study by the present inventor, unacceptable wear occurs in the sludge discharge pipe 6 in the straight pipe 6b immediately downstream of the curved pipe 6a. It was concentrated in the cm range, and in most cases, it was sufficient to replace a part of the curved pipe 6a immediately downstream.

Therefore, in the present embodiment, as described above, the replacement pipe portion 6be is provided in the detachable state immediately after the downstream of the curved pipe 6a. As a result, when exchanging a worn part of the sludge discharge pipe 6, it is sufficient to replace a part of the replacement pipe portion 6be of the direct pipe 6b without replacing all of the direct pipe 6b. Since this exchange pipe portion 6be has a short axial length of about 50 cm and is easy to handle, it can be easily processed and transported, and even in a narrow tunnel, exchange work is easily performed. be able to. In addition, since the replacement location is short, it is possible to effectively use resources and reduce the cost of the sludge pipe 6.

Further, in the present embodiment, the axial lengths of all the replacement piping portions 6be in the sludge discharge pipe 6 are unified to a predetermined length L3. As a result, the replacement pipe portion 6be can be used at any position of the sludge discharge pipe 6. Therefore, for example, by arranging a plurality of replacement pipe portions 6be created in advance in a place where there are many curved pipes 6a in the tunnel T, it is possible to replace the worn portion of the sludge pipe 6 with the replacement pipe portion 6be. It is possible to omit processing and transportation of the pipe portion 6be.

As a result, it is possible to shorten the replacement time of the worn part of the sludge discharge pipe 6 of the shield machine 1. Therefore, since the interruption time of the tunnel excavation work by the shield machine 1 can be shortened, the construction period of the tunnel excavation work can be shortened and the construction cost of the tunnel excavation work can be reduced.

Next, an example of the replacement work of the replacement piping part 6be will be described with reference to FIG. 6(a) to 6(c) show enlarged side surfaces of essential parts of the sludge discharge pipe during the replacement work of the replacement pipe part.

First, as shown in FIG. 6( a ), before the replacement work of the sludge pipe 6, a plurality of replacement pipe parts 6 bes created in advance at a plurality of places (a place where there are many curved pipes 6 a etc.) Is placed. In addition, the x mark indicates a portion where the wear occurs in the sludge discharge pipe 6. Further, in order to make the drawings easy to see, the replacement piping parts 6bes prepared in advance are hatched.

Subsequently, in the replacement work of the worn part of the sludge discharge pipe 6, by removing the joint 6c for mechanically connecting the worn replacement pipe part 6be and the sludge discharge pipe 6, as shown in FIG. 6(b). Then, the worn replacement pipe portion 6be is removed from the sludge discharge pipe 6.

After that, instead of the worn replacement pipe portion 6be, as shown in FIG. 6(c), the replacement pipe component 6bes prepared in advance is aligned with the sludge pipe 6 and the fitting joint 6c is used. Fix it. It should be noted that the portion of the replacement piping component 6be prepared in advance that has been reduced due to replacement can be replenished even during excavation work, for example.

Here, when the sludge pipe structure of the present embodiment is not adopted (in the case of FIG. 5), on average, it takes about 30 minutes to process the replacement pipe, about 10 minutes for transportation, and about 20 minutes for the replacement work. It took about 60 minutes in total, but in the case of the present embodiment, on average, it takes about 0 minutes to process the replacement pipe ( replacement piping part 6bes ), about 0 minutes for transportation, and about 15 minutes for replacement work. The total time could be reduced to about 15 minutes. As a result, the interruption time of the tunnel excavation work by the shield machine 1 could be suppressed to 25%.

Although the invention made by the inventor has been specifically described based on the embodiments, the embodiments disclosed in the present specification are exemplifications in all respects, and are limited to the disclosed technology. Not a thing. That is, the technical scope of the present invention should not be limitedly interpreted based on the description of the above-mentioned embodiment, but should be interpreted according to the description of the claims to the last. All modifications are included without departing from the scope of the claims and the technology equivalent to the described technology.

In the above-described embodiment, the case where all the axial lengths of the replacement piping portions 6be are the same has been described, but the present invention is not limited to this, and, for example, the axes of the replacement piping portions 6be at a plurality of locations. The direction length is unified to a first predetermined length, and the axial lengths of the replacement piping portions 6be at a plurality of other places are unified to a second predetermined length different from the first predetermined length. You may do so.

INDUSTRIAL APPLICABILITY The present invention is effective when applied to the replacement technology of the mud discharge pipe of a muddy water excavator.

1 shield machine 2 cutter head 2a bit 2b scraper tooth 2c copy bit 3 equipment body 4 mud chamber 5 mud pipe 6 mud pipes 6a, 6a1, 6a2 curved pipes 6b, 6b1-6b5 direct pipe 6be replacement pipe part
6bes Replacement piping parts 6bu, 6bu1 to 6bu3 Residual piping part 6c Joint 7 Partition 10 Cutter driver 11a Middle-folded jack 11b Shield jack 12 Electa T tunnel SG segment Pd Sludge pump

Claims (6)

A plurality of curved pipes provided at the position where the path is bent in the middle of the sludge discharge pipe formed of steel that carries the mixed mud of the mud in the chamber of the mud excavator and the excavated earth and sand to the outside of the tunnel,
Direct piping provided between each of the plurality of curved piping,
Replacement piping parts made in advance,
Equipped with
The direct piping is
A replacement piping portion provided in a detachable state immediately after the downstream of the curved piping,
A residual piping portion provided in a detachable state downstream of the replacement piping portion,
Equipped with
The replacement piping part is replaceable with the replacement piping part and can be mounted,
The replacement pipe part in which the inside of the pipe is worn can be replaced with the replacement pipe part,
A mud pipe facility for a mud excavator, which is characterized in that The mud pipe equipment for a mud excavator according to claim 1 , wherein a length of the replacement pipe portion is shorter than a length of the residual pipe portion . The mud pipe equipment for a muddy water excavator according to claim 1 or 2, characterized in that the length of the replacement pipe portion is set to the same predetermined length in the plurality of the direct pipes . The mud pipe equipment for a mud excavator according to claim 1, 2 or 3, wherein the replacement pipe portion is provided in the mud pipe in the tunnel . The length of the replacement pipe portion is set according to a range of wear on the downstream side of the bent pipe that is bent 90 degrees among the plurality of bent pipes . The mud discharge pipe equipment for a mud excavator according to any one of claims. The mud pipe equipment for a mud excavator according to any one of claims 1 to 5, wherein a length of the replacement pipe portion is 30 cm to 60 cm .

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