JP2005126958A - Joint method of shield machine and underground joint type shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint method of a shield machine capable of surely cleaning the surface of a cut-off seal of a fitting section at a low cost and an underground joint type shield machine. <P>SOLUTION: In both shield machines making an underground joint by using a shield machine 2 on an acceptance side and a shield machine 1 on a penetration side, the shield machine 1 on the penetration side is equipped with an outer cylinder 11 consisting of the front end section thereof, an inner cylinder 12 capable of sliding in the outer cylinder 11 and a cutter disc 13 provided forward of the inner cylinder, the cutter disc 13 is equipped with expansible expansion spoke 131 in the radial direction of the cutter disc 13, and it is constituted by having a cleaning brush 3 on the front end of the expansion spoke 131. While making the shield boring machine 1 on the penetration side penetrate the inside of a cylindrical body 21 of the shield machine 2 on the acceptance side, a projected length of the cleaning brush 3 is gradually varied to carry out cleaning of the inside circumferential surface of the cylindrical body 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a joining method of a ground joint type shield machine that joins a receiving shield machine and a penetration shield machine that penetrate from two opposite directions in the ground, and a shield on the penetration side. It relates to the excavator.

  Recently, the shield method has been increasingly applied when building tunnels in soft ground or underground in urban areas. In such a case, it is also possible to construct multiple shafts due to construction period restrictions or construction extension, etc., start shield shield machines from each shaft, and use underground joint construction that joins shield tunnel machines in the ground is there.

  In the conventional underground welding construction of shield machine, the ground around the joint was frozen by freezing, or the ground was solidified by injecting a solidifying agent. Further, when the joint is under the action of high-pressure water, the above-described freezing range and solidifying agent injection range have been widened.

By the way, various methods have been devised so far for the underground bonding method of the shield machine and the underground bond type shield machine. In particular, when water sealing is applied to the joint (joint surface) of the receiving side shield machine and the penetration side shield machine, it is necessary to secure the water stopping performance by removing the soil and sand adhering to the joint surface. There is.
Conventional methods of cleaning the joint surface include a method of injecting high-pressure water from cleaning pipes provided at a plurality of locations on the outer peripheral surface of the shield machine, and circulating muddy water in each chamber after the opposing shield machine is fitted. There are methods.
In Patent Document 1, there are first and second shield machines that have been excavated in the phase approaching direction, and a ring-shaped hood provided at the front end of the second shield machine is provided in the tip body of the first shield machine. An invention is disclosed in which, when penetrating, a water-seal-adhering surface is cleaned by scraping the soil on the outer peripheral surface of the hood with a scraper provided on the inner peripheral side of the body.
JP 2000-265781 A JP 2002-138787 A JP 2002-285787 A

The above-described conventional underground joint type shield machine and underground joint method have the following problems.
<1> In the construction method in which the underground joint portion is frozen by a freezing method or the ground is solidified by injecting a solidifying agent, a large amount of construction cost is required, and a ground period is required for ground improvement. In particular, when the joint is under the action of high-pressure water, problems such as an increase in construction costs and a prolonged construction period are likely to occur.
<2> In the method of injecting high-pressure water from the cleaning pipe, the cleaning pipe cannot be continuously arranged on the circumference of the water stop surface, so that a poorly cleaned portion may occur.
<3> In the method of cleaning the surface of the water-stopping seal by scraping the earth and sand of the water-stopping surface with a scraper, there is a high possibility that the surface of the water-stopping seal and the water-stopping seal are damaged by the scraper.
<4> When the two shield machines to be joined are joined in an eccentric state, the clearance of the fitting portion becomes uneven in the circumferential direction. In such a case, it is difficult to reliably clean the water stop surface in the circumferential direction by a method using a cleaning tube or a scraper.

  In order to solve the above problems, the shield machine according to the present invention joins the receiving side shield machine and the penetration side shield machine which are excavated from two opposite directions to each other in the ground. In the penetration-side shield machine that constitutes the underground joint-type shield machine, the penetration-side shield machine has an outer cylinder that constitutes a front end portion thereof, an inner cylinder that is slidable in the outer cylinder, A cutter disk provided in front of the cylinder, and a partition wall disposed behind the cutter disk, the cutter disk including an elastic spoke that can expand and contract in a radial direction of the cutter disk, and cleaning the tip of the elastic spoke It is a shield machine characterized by comprising a brush.

  Further, in the shield machine, the cleaning brush is formed into a brush shape by bundling bristle members having a predetermined diameter, and the cleaning brush cleans the wide surface of the cleaning brush formed into a brush shape. It is possible to use a shield machine that is provided at the tip of the telescopic spoke with a predetermined angle with respect to the moving direction of the cleaning brush.

  Further, the joining method of the underground joint type shield machine according to the present invention is a joining method of the underground joint type shield machine using the shield machine, and the cutter disk of the receiving side shield machine is moved backward. The cutter disk of the shield engraving machine on the intrusion side is advanced into the cylinder constituting the front end of the shield engraving machine on the receiving side, and is provided behind the cutter disk and the cutter disk of the receiving shield engraving machine. Muddy water is circulated through the gap between the bulkhead, the gap between the cutter disk and the bulkhead of the shield machine on the penetration side, and the gap between the cutter disk on the reception side and the shield disk on the penetration side. The projecting length of the cleaning brush is changed stepwise while rotating the cutter disk of the shield machine on the penetration side The inner peripheral surface of the cylindrical body was cleaned, and the distance between the outer cylinder of the shield engraving machine on the intrusion side and the cylindrical body of the shield engraving machine on the receiving side reached a distance capable of preventing sediment collapse. In step, the gap between the cutter disk and the partition wall of the receiving side shield machine and the gap between the cutter disk and the partition wall of the shield side machine on the penetration side, the shield machine and the shield side machine on the penetration side It is a joining method of the underground joint type shield machine, characterized in that the fresh water is circulated after the mud water circulation is stopped between the respective cutter disks of the machine.

  Further, in the joining method of the underground joint type shield machine according to the present invention, after the fresh water is circulated in the joining method of the underground joint type shield machine, the cutter disk of the shield machine at the penetration side is rotated. The cleaning brush is extended to clean the surface of the annular water seal that is housed in the annular recess provided on the inner peripheral surface of the cylindrical body, and the annular water seal that is accommodated in the annular recess is projected to the inner air side. A water stop structure can be formed by contacting the outer peripheral surface of the inner cylinder.

Further, in the joining method of the underground joint type shield machine, the cleaning state of the surface of the annular water stop seal housed in the annular recess of the shield machine on the penetration side is sequentially confirmed through a scope. It is also possible to use the joining method of the underground joint type shield machine.

The method for joining the shield machine and the ground joint type shield machine according to the present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> Since the cleaning brush sweeps out the earth and sand from the water stop surface along with the rotation of the cutter disk, the water stop surface can be uniformly cleaned over the entire surface.
<2> By giving a predetermined attachment angle to the cleaning brush, the swept earth and sand will move forward, and re-adhesion of the earth and sand after sweeping can be prevented.
<3> When two shield machines are joined in an eccentric state, the clearance of the fitting portion is not uniform on the water stop surface. Even in such a case, the water stop surface can be reliably and uniformly cleaned by adjusting the overhang length of the cleaning brush.
<4> For example, by using a nylon cleaning brush, the risk of damaging the water-stop seal surface is extremely reduced.
<5> Since a wide range of freezing methods and ground improvement are not required, the construction period can be shortened and the construction cost can be reduced.

<1> Overall Configuration The present invention is a ground joint type shield machine that joins the receiving side shield machine 2 and the penetration side shield machine 1 that are excavated from two opposite directions in the ground. Among these, it is especially related to the shield machine 1 on the penetration side. Further, the present invention relates to a joining method of the underground shield type shield machine using the receiving side shield machine 2 and the penetration side shield machine 1.
As will be described later, the penetration-side shield machine 1 includes an outer cylinder 11 constituting a front end portion thereof, an inner cylinder 12 slidable in the outer cylinder 11, and a cutter disk 13 provided in front of the inner cylinder 12. And a partition wall 14 disposed behind the cutter disk 13 (see FIG. 1). The inner cylinder 12 and the cutter disk 13 are configured to be slidable by a sliding jack 15 provided behind the partition wall 14.
On the other hand, the shield machine 2 on the receiving side includes a cylindrical body 21 that constitutes a front end portion thereof, a cutter disk 22 that is slidably mounted in the cylindrical body 21, a partition wall 23 provided behind the cutter disk 22, and the like. (See FIG. 1). The cutter disk 22 is configured to be slidable by a sliding jack 24 provided behind the partition wall 23.

The penetration-side shield machine 1 includes a cleaning brush 3 (described later) that can be expanded and contracted in the radial direction of the cutter disk 13. In the present invention, the cutter disk 13 of the penetration-side shield machine 1 is advanced into the cylinder 21 of the reception-side shield machine 2 and the cutter disk 13 is rotated to gradually increase the overhang length of the cleaning brush 3. The main purpose is to clean the inner peripheral surface 211 of the cylindrical body 21 by changing it.
The inner peripheral surface 211 of the cylindrical body 21 of the receiving side shield machine 2 is provided with an annular recess 212 (see FIG. 4). Here, the annular recess 212 is a recess provided in the front end portion of the cylindrical body 21 in the circumferential direction. An annular water seal (annular water seal 4) is accommodated in the annular recess 212. A known water stop material (rubber water stop material or resin water stop material) can be used for the water stop seal.

The overhang length of the cleaning brush 3 is changed stepwise, and cleaning is performed while removing earth and sand adhering to the surface of the annular water stop seal 4 housed in the annular recess 212. In the present invention, the water-stopping material (and the water-stopping surface) is cleaned by the combined use of the muddy water circulation and the brushing by the cleaning brush 3 and the combined use of the fresh water circulation and the brushing by the cleaning brush 3.
A water stop structure can be formed by projecting the annular water stop seal 4 to the inner air side in a state where fresh water is circulated and bringing it into contact with the outer peripheral surface of the inner cylinder 12.
Here, one of the purposes of circulating the muddy water is to make the specific gravity larger than that of fresh water, so that the earth and sand collapsed from the outside in the separation between the shield-side shield machine 1 on the penetration side and the shield-side machine 2 on the receiving side. This is to prevent it from coming. When the distance between the two shield machines approaching each other approaches a certain distance and the risk of sediment collapse is low due to the specific gravity of the fresh water, the mud circulation is stopped and the process proceeds to the fresh water circulation.

<2> Penetration-side shield machine 1 The penetration-side shield machine 1 is provided in front of the inner cylinder 12, an outer cylinder 11 constituting the front end, an inner cylinder 12 slidable in the outer cylinder 11, and the inner cylinder 12. The cutter disk 13 and the partition wall 14 disposed behind the cutter disk 13 are configured.
The cutter disk 13 includes an expansion / contraction spoke 131 that can expand and contract in the radial direction of the cutter disk 13, and includes a cleaning brush 3 described later at the tip of the expansion / contraction spoke 131. Here, a plurality of the stretchable spokes 131 can be provided on the cutter disk 13. Therefore, the cleaning brush 3 can be provided on each of the telescopic spokes 131, or can be configured with only one location.
It is preferable that the outer diameter of the outer cylinder 11 of the penetration-side shield machine 1 and the outer diameter of the cylindrical body 21 of the reception-side shield machine 2 are made to be approximately the same. Further, the outer diameter of the cutter disk 13 and the outer diameter of the inner cylinder 12 are made smaller than the inner diameter of the cylinder 21 so that the cutter disk 13 and the inner cylinder 12 can penetrate into the cylinder 21.

  The inner cylinder 12 and the cutter disk 13 are configured to be slidable by a sliding jack 15 provided at the rear of the partition wall 14 so that the cutter disk 13 is rotated forward while the cleaning brush 3 is extended so as to penetrate forward. The inner peripheral surface 211 of the cylinder 21 can be cleaned by a predetermined extension.

In the underground joining of the shield machine of the present invention, the inside of the gap 8 between the cutter disk 13 of the shield shield machine 1 on the penetration side and the cutter disk 22 of the shield machine 2 on the receiving side and the chambers 16 and 25 of each shield machine. The mud water 6 is circulated inside, and the earth and sand in the chambers 16 and 25 are circulated and collected. Here, the chambers 16 and 25 refer to a space surrounded by the cutter disk 13, the partition wall 14 and the inner cylinder 12 in the shield shield machine 1 on the penetration side, and the cutter disk 22 in the shield shield machine 2 on the reception side. The space surrounded by the partition wall 23 and the cylinder 21 is said.
In order to realize the above-described mud water circulation, a mud feeding pipe 17 and a mud discharging pipe 18 are provided to communicate with the inside of the chamber 16 from behind the partition wall 14 of the shield machine 1 on the intrusion side. During the muddy water circulation, it is possible to efficiently collect the sediment in the chamber 16 by rotating the cutter disk 13.
Note that the mud pipe 17 and the mud pipe 18 can also be used in the circulation of the fresh water 7.

Furthermore, in the underground joining method of the present invention, the cleaning state of the surface of the annular water seal 4 can be sequentially recognized using the scope 5. The scope 5 preferably uses a scope insertion tube 19 extending from the rear of the partition wall 14 through the chamber 16 to the end of the cutter disk 13 (the tip of the cleaning brush 3). Note that the scope 5 can be connected to a monitor 100 provided behind the partition wall 14 so as to be visible from the inside of the shield machine (see FIG. 4).

<3> Cleaning brush When the shield shield machine 2 on the receiving side retracts the cutter disk 22 and then the shield machine 1 on the penetration side digs and joins several tens of centimeters, the cutter disks 13 of both shield machines There is a possibility that several m ³ of natural ground remaining in the gap 8 of 22 may collapse, and such residual natural ground may not be completely recovered by simply circulating the muddy water 6. In addition, if there is sediment on the surface of the annular water stop seal 4 housed in the annular recess 212 provided on the inner peripheral surface 211 of the cylindrical body 21, there is a concern that it may be a major obstacle to securing water stoppage. It is necessary to remove the earth and sand on the surface of the annular water seal 4 as much as possible.
Therefore, in the present invention, in order to clean the earth and sand adhering / depositing on the inner peripheral surface 211 of the cylindrical body 21 of the receiving-side shield machine 2, the tip of the expansion / contraction spoke 131 of the penetration-side shield machine 1 is reliably removed. The cleaning brush 3 is equipped.

The cleaning brush 3 is configured by bundling bristle members 31 having a predetermined diameter and forming them in a brush shape, and providing them at the tip of the expansion / contraction spoke 131 (see FIGS. 7 and 8). Here, as the dimension of the cross section of the cleaning brush 3 bundled in a brush shape, the length of the wide surface can be formed to about 10 cm and the length of the short side can be formed to about 3 cm. The bristle member 31 has a brush length of about 25 cm, and a base of about 8 cm in which the bristle member 31 is bundled can be made of hard rubber.
The bristle member 31 is preferably made of, for example, a nylon material.

The cleaning brush 3 is stored in the cutter disk 13 while the penetration-side shield machine 1 is excavating the ground. In this case, it is preferable that the cleaning brush 3 is fixed in the cutter disk 13 with a plurality of fixing rubbers 133, and that the vicinity of the tip of the cleaning brush 3 is protected from four sides with a protective rubber 132 (see FIG. 9). The protective rubber 132 is adhered to the cutter disk 13 in a state where the level is adjusted so that the tip of the cleaning brush 3 is at the same level as the outer surface of the protective rubber 132 or the expansion / contraction spoke 131 side.
When the cleaning brush 3 is extended, the protective rubber 132 and the fixed rubber 133 are removed to the outside while being pushed by the telescopic spokes 131 (see FIG. 10).

In the present invention, as will be described later, a demonstration experiment is performed using the diameter of the bristle member 31 and the attachment angle of the cleaning brush 3 as parameters, and the optimum diameter of the bristle member 31 and the attachment of the cleaning brush 3 when sweeping soil to the side. The angle was selected. Here, the attachment angle of the cleaning brush 3 is a predetermined width with respect to the moving direction of the cleaning brush 3 where the cleaning brush 3 is in contact with the cleaning surface among the wide surfaces of the cleaning brush 3 formed into a brush shape. This is a predetermined angle when provided at the tip of the extensible spoke 131 with an angle.
As a result of a demonstration experiment to be described later, there is a case where the bristle member 31 having a diameter of 0.7 mm is used and the cleaning brush 3 is provided at the tip of the expansion and contraction spoke 131 at a predetermined angle of 30 to 45 degrees. It was found that the earth and sand can be efficiently swept to the side.
Therefore, it is preferable to provide the bristle member 31 having the diameter described above and the mounting angle.
However, the diameter of the bristle member 31 and the attachment angle of the cleaning brush 3 are not limited to the above specifications, and can be variously selected.

The cleaning brush 3 is extended while changing the extension length stepwise in the radial direction of the cutter disk 13, and according to the rotation of the cutter disk 13, the soil and sand adhering to the inner peripheral surface 211 of the cylindrical body 21 are swept away. The earth and sand can be surely and efficiently swept out without damaging the surface of the annular water stop seal 4 accommodated in the annular recess 212. In addition, even when the two shield machines to be joined are joined in an eccentric state, by adjusting the overhang length of the cleaning brush 3, it is possible to flexibly with respect to the clearance of the non-uniform fitting portion in the circumferential direction. Can respond.
As a stepwise overhang method for the cleaning brush 3, first, a large overhang length (the length pressed against the cleaning surface is large) and a method of gradually shortening the overhang length or a method of gradually increasing the overhang length. and so on. In order to perform efficient earth and sand cleaning, it is preferable to use a method in which a large overhang length is first set and then the overhang length is gradually shortened.

<4> Demonstration experiment of cleaning brush The purpose of this demonstration experiment is to select the mounting angle (θ) of the cleaning brush 3 that efficiently sweeps earth and sand to the side of the brush traveling direction, and to collect the entire cleaning brush 3 and the brush It is in the selection of the diameter (φ) of the bristle member 31 that determines the tenacity.

  As shown in FIG. 11, the experiment was conducted for each parameter using θ and φ as parameters.

An outline of the experimental apparatus 91 is shown in FIG. In this experimental apparatus, a joint of a shield machine (shield shield machine 2 on the receiving side) having a shield outer diameter of 3.6 m is modeled, and the cleaning brush 3 is placed on the surface of the annular water seal 4 having a width of about 3 cm. It is done by running. The above-described model 92 is housed in the water tank 93, and a soil sample (earth and sand 94) is laid on the surface of the annular water stop seal 4 to a thickness of about 2 cm, and water is immersed in the water tank 93. The operating rod 96 is manually moved in one direction along the guide groove 95 provided on the upper part of the water tank 93. Here, the cleaning brush 3 (for example, full size) is attached to the tip of the operation rod 96.
The earth and sand sample used is composed of a gravel sample having a particle size of 5 to 10 mm, a sand sample having a particle size of 0.074 to 2 mm, and a clay sample having a particle size of 0.005 mm or less.

In the experiment method, the pressing length of the cleaning brush 3 against the surface of the annular water seal 4 is set to a predetermined length, and the operation rod 96 is moved in one direction at a speed equivalent to 0.5 rpm that is the rotational speed of the cutter disk 13. Move it. The traveling movement of the cleaning brush 3 is repeated until there is no change in the cleaning condition of the earth and sand 94.
The experiment was conducted for a cleaning brush attachment angle (θ) selection experiment and a bristle member diameter (φ) selection experiment.
In addition, as shown in FIG. 12, the measurement position divides the annular water stop seal 4 into 6 in the extending direction (A to F), and each divided length is 10 cm.

The cleaning brush attachment angle (θ) selection experiment is performed in two cases of attachment angles (θ) of 30 degrees and 45 degrees.
The bristle member diameter (φ) selection experiment is conducted in three cases of φ, 0.5 mm, 0.7 mm, and 0.9 mm with θ set at 45 degrees.
Table 1 shows the cleaning brush attachment angle (θ) selection experiment case, and Table 2 shows details of the bristle member diameter (φ) selection experiment case.

<5> Results of Demonstration Experiment of Cleaning Brush FIG. 13 shows the results of an experiment for selecting a cleaning brush attachment angle (θ). From FIG. 13, it was found that a high sweeping effect can be obtained when θ is in the range of 30 to 45 degrees.

FIG. 14 shows the bristle member diameter (φ) selection experiment results. From FIG. 14, it can be seen that when φ is 0.7 mm, the sweep width of the earth and sand 94 is increased.
According to the observation during the experiment, the cleaning brush 3 is not sticky when φ is 0.5 mm, and the density of the brush is small when 0.9 mm. In either case, the sweeping effect of the earth and sand 94 tends to be low. It was.
Therefore, it can be concluded that about 0.7 mm is optimal as the bristle member diameter (φ) having a high sweeping effect.

  Hereinafter, the joining method of the underground joint type shield machine according to the present invention will be described with reference to the drawings.

  The receiving-side shield machine 2 and the penetration-side shield machine 1 are made to dig in close proximity to each other. The cutter disk 22 of the receiving-side shield machine 2 is pulled backward, and the cutter disk 13 of the penetrating-side shield machine 1 is advanced into the cylinder 21 of the receiving-side shield machine 2. At this time, the separation between the outer cylinder 11 and the cylinder 21 can be set to 152 mm, for example. The muddy water 6 is fed into the chambers 16 and 25 and the gap 8 between the cutter disks 13 and 22 from the mud pipe 17 and the muddy water is circulated while rotating the cutter disk 13 (see FIG. 1).

  Next, the inner peripheral surface 211 of the cylindrical body 21 is cleaned while gradually changing the overhang length of the cleaning brush 3. Here, the pressing length of the cleaning brush 3 can be performed, for example, every 10 rotations in the order of 15 cm → 5 cm → 3 cm (see FIG. 2).

  The shield engraving machine 1 on the penetration side is advanced so that the separation between the outer cylinder 11 and the cylinder 21 is 100 mm and 50 mm, and cleaning is performed by the cleaning brush 3 at each stage. After such cleaning, the fresh water 7 is sent into the gaps 8 between the chambers 16 and 25 and the cutter disks 13 and 22, and the mud water 6 and the fresh water 7 are replaced to circulate the fresh water 7 (see FIG. 3).

  The inner cylinder 12 and the cutter disk 13 are slid forwardly by the sliding jack 15 (advanced into the cylinder 21), and cleaning is performed by the cleaning brush 3 at each stage (see FIG. 4). Here, the cleaning cleans the surface of the annular water stop seal 4 housed in the annular recess 212 in the inner peripheral surface 211 of the cylindrical body 21 in particular. The stepwise sliding by the sliding jack 15 can be, for example, a sliding length of 5 cm → 10 cm → 15 cm → 20 cm → 25 cm → 30 cm.

After extending the sliding jack 15 by a predetermined length, the scope 5 is inserted into the scope insertion tube 19 to confirm the separation between the outer cylinder 11 and the cylinder 21 and the state of washing of the earth and sand on the inner peripheral surface 211. Depending on the cleaning condition of earth and sand, it is preferable to repeat cleaning with the cleaning brush 3 again.
After confirming the cleaning condition of the surface of the annular water seal 4, the annular water seal 4 is extended toward the inner space and brought into contact with the outer peripheral surface of the inner cylinder 12 (see FIG. 5).
Here, as a method of projecting the annular water seal 4, for example, there is a method in which pressurized water or the like is supplied into the annular recess 212 to expand the annular water seal 4 inward. By adopting a configuration in which the annular water seal 4 is extended by such a method, the annular water seal 4 can be brought into contact with the outer peripheral surface of the inner cylinder 12 with a strong pressure.

After the annular water stop seal 4 is brought into contact with the outer peripheral surface of the inner cylinder 12, the fresh water 7 is dehydrated from the gaps 8 between the chambers 16 and 25 and the cutter disks 13 and 22. Thereafter, the presence or absence of spring water is confirmed. If there is no spring water, the worker 200 can enter and exit the chambers 16 and 25 and the process moves to the final connection work (see FIG. 6).

Among the joining methods of the underground joint type shield machine according to the present invention, the situation is described in which the cutter disk of the receiving side shield machine is drawn backward, the penetration side shield machine is advanced, and the muddy water is circulated. Longitudinal diagram. The longitudinal section explaining the situation where the cleaning brush is projected and cleaned among the joining methods of the underground joint type shield machine of the present invention. Among the joining methods of the underground joint type shield machine according to the present invention, the situation where the cleaning brush is cleaned and the fresh water is circulated while narrowing the distance between the receiving side shield machine and the penetration side shield machine is explained. Vertical section. The longitudinal section explaining the situation where cleaning is performed with the cleaning brush while the cutter disk of the penetration shield shield machine is advanced stepwise in the joining method of the underground joint shield machine of the present invention. The longitudinal section explaining the situation where the water stop structure is formed by projecting an annular water stop seal among the joining methods of the underground joint type shield machine of the present invention. The longitudinal cross-sectional view explaining the condition which is extracting the fresh water and confirming the spring water among the joining methods of the underground joining type shield machine of this invention. The longitudinal section which expanded the situation where it is cleaning with the cleaning brush. The aa arrow directional view of FIG. Sectional drawing explaining the condition where the cleaning brush is accommodated in the cutter disk. Sectional drawing explaining the condition where the cleaning brush has protruded from the inside of a cutter disk. Explanatory drawing explaining each parameter of the demonstration experiment of the cleaning brush. The perspective view explaining the experimental apparatus of the proof experiment of a cleaning brush. Explanatory drawing which showed the verification experiment result of the cleaning brush. Explanatory drawing which showed the verification experiment result of the cleaning brush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shield engraving machine 11 on the intrusion side, outer cylinder 12, inner cylinder 13, cutter disk 14, bulkhead 131, telescopic spoke 2 ... receiving side shield engraving machine 21, cylindrical body 212 Annular recess 22 ··· Cutter disk 23 ··· Partition 3 ··· Cleaning brush 4 ··· Ring seal 5 ··· Scope 6 · · · Mud water 7 · · · clear water

Claims (5)

In the shield shield machine on the penetration side that constitutes the underground shield type shield machine that joins the shield shield machine on the reception side and the shield shield machine on the penetration side that are excavated from two opposite directions in the ground,
The shield machine on the penetration side includes an outer cylinder constituting a front end portion thereof, an inner cylinder slidable in the outer cylinder, a cutter disk provided in front of the inner cylinder, and a partition wall arranged behind the cutter disk, With
The cutter disk is provided with an expansion / contraction spoke that can expand and contract in a radial direction of the cutter disk, and a cleaning brush is provided at the tip of the expansion / contraction spoke.
Shield machine.
In the shield machine according to claim 1,
The cleaning brush is formed into a brush shape by bundling bristle members having a predetermined diameter,
Of the wide surface of the cleaning brush formed into a brush shape, a contact side where the cleaning brush contacts the cleaning surface is provided at the tip of the telescopic spoke with a predetermined angle with respect to the moving direction of the cleaning brush. Characterized by the
Shield machine.
A method for joining an underground joint type shield machine using the shield machine according to claim 1 or 2,
Pull back the cutter disk of the receiving side shield machine,
Advance the cutter disk of the shield machine on the penetration side into the cylinder constituting the front end of the shield machine on the reception side,
The gap between the cutter disk of the receiving side shield machine and the bulkhead provided behind the cutter disk, the gap of the cutter disk and the bulkhead of the shield side machine on the penetration side, the shield side machine of the receiving side and the penetration side Circulating muddy water between the cutter discs of each of the shield machines,
While rotating the cutter disk of the shield machine on the penetration side, the overhang length of the cleaning brush is changed stepwise to clean the inner peripheral surface of the cylindrical body,
The cutter disk of the receiving-side shield machine when the distance between the outer cylinder of the penetration-side shield machine and the cylindrical body of the receiving-side shield machine reaches a distance that can prevent sediment collapse And the gap between the bulkhead, the gap between the cutter disk and the bulkhead of the shield machine on the penetration side, and the gap between the cutter disk of the shield machine on the reception side and the cutter disk of the shield machine on the penetration side, respectively. It is characterized by circulating fresh water after stopping
Joining method of underground joint type shield machine.
In the joining method of the underground joint type shield machine according to claim 3,
After circulating Shimizu,
While rotating the cutter disk of the shield machine on the intrusion side, the cleaning brush is extended to clean the surface of the annular water stop seal stored in the annular recess provided on the inner peripheral surface of the cylinder,
The water stop structure is formed by projecting the annular water stop seal accommodated in the annular recess to the inner space side and bringing it into contact with the outer peripheral surface of the inner cylinder,
Joining method of underground joint type shield machine.
In the joining method of the underground joint type shield machine according to claim 4,
The cleaning state of the surface of the annular water stop seal stored in the annular recess of the shield machine on the intrusion side is sequentially confirmed through a scope,
Joining method of underground joint type shield machine.

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