JP2015021338A - Exchange device and exchange method for earth pressure gauge of mud pressure shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily exchange an earth pressure gauge of a mud pressure shield machine.SOLUTION: An earth pressure gauge 11a of a mud pressure shield machine is provided in a seal housing 11bh communicating with a through-hole 7a formed in a barrier 7 at a freely movable state, and is structured to be exchangeable by being taken out to a machine interior side. When exchanging the earth pressure gauge 11a, a slurry forming material is injected as a replacement material into a space on the opposite side of the earth pressure gauge 11a through an injection pipe 11bt while retreating the earth pressure gauge 11a, thereby preventing mud in a chamber from intruding into the seal housing 11bh through the through-hole 7a. After the earth pressure gauge 11a is made to retreat more than a sluice valve 11bp at a middle position of the seal housing 11bh, the sluice valve 11bp is closed and then the earth pressure gauge 11a is taken out from the seal housing 11bh and is exchanged.

Description

  TECHNICAL FIELD The present invention relates to a mud pressure shield excavator earth pressure gauge exchanging apparatus and a mud pressure shield excavator earth pressure gauge exchanging method.

  The mud pressure shield machine cuts mud soil with imperviousness and plastic fluidity (property of free deformation and movement) generated by injecting and mixing additives into the soil excavated by the cutter head. The excavation process is carried out in a state where mud pressure is generated by digging in a state where the chamber provided on the back side of the head is filled and the mud pressure is opposed to the earth pressure of the face. In the excavation process, the stability of the face is maintained by excavating and discharging the soil while maintaining the mud pressure in the chamber at a predetermined value. For this reason, the partition which divides a chamber and the inside of an apparatus main body is installed with the earth pressure gauge which measures the mud pressure in a chamber (for example, refer patent documents 1, 2).

Japanese Utility Model Publication No. 2-37913 Japanese Utility Model Publication No.2-132797

  By the way, if the earth pressure gauge of the mud pressure shield machine has failed, it is necessary to replace the earth pressure gauge.However, when exchanging the earth pressure gauge, the excavation operation of the shield machine is stopped and chemicals etc. are applied to the face side. It is necessary to work to improve the ground to inject and fix the excavated surface portion, and to discharge the soil in the chamber. For this reason, the exchanging work of the earth pressure gauge stops the excavation work for a long time, which is a factor hindering the long-distance construction of the shield machine.

  In particular, in excavation work where there are many cobblestones or the like, even if the detection surface of the earth pressure gauge is filled with silicon resin or the like to protect it, permanent deformation will occur in the earth pressure gauge due to the cobblestone or the like overloading the earth pressure gauge. As the frequency of failures that would occur and make it impossible to properly manage earth pressure increases, how to make it easy to replace earth pressure gauges and realize long-distance construction of shield machines It has become.

  This invention is made | formed from the above-mentioned technical background, The objective is to provide the technique which can replace | exchange the earth pressure gauge of a mud pressure shield excavator easily.

  In order to solve the above-mentioned problem, the earth pressure gauge exchanging device of the mud pressure shield machine according to claim 1 of the present invention penetrates a partition that divides the inside of the equipment body of the mud pressure shield machine into a face side and an inside of the machine. A cylindrical body that is provided so as to communicate with the through-hole, and that extends from the through-hole toward the inner side of the machine, and an opening / closing means that is provided at an intermediate position of the cylindrical body and opens and closes the hollow path. A holding member that holds the earth pressure gauge that is provided in the cylinder so as to be movable along the hollow path and that has the earth pressure detection surface facing the face, and the hollow path includes the holding member. Injecting means for injecting a replacement material having fluidity into a space formed on the opposite side of the earth pressure detection surface of the earth pressure gauge.

  According to a second aspect of the present invention, there is provided a method for replacing the earth pressure gauge of the mud pressure shield machine according to the present invention from a through hole penetrating a partition dividing the inside of the machine body of the mud pressure shield machine into a face side and an inside of the machine. In the cylinder forming the hollow path extending toward the machine inner side, the earth pressure gauge arranged with the earth pressure detection surface facing the face side is moved to the machine inner side along the hollow path, and A step of injecting a fluid replacement material into a space formed on the opposite side of the earth pressure detection surface by the movement of the earth pressure gauge; and the earth pressure gauge is provided at an intermediate position of the cylinder by the movement of the earth pressure gauge. A step of closing the opening / closing means when positioned on the inner side of the opening / closing means, a step of moving the earth pressure gauge to the inner side of the machine after the closing of the opening / closing means and exchanging it from the cylinder; Replace the earth pressure gauge After that, the step of inserting the replaced earth pressure gauge into the cylinder with the earth pressure detection surface facing the face is inserted with the opening / closing means closed, and the exchanged earth pressure gauge is inserted into the cylinder. And then opening the opening / closing means and moving the replaced earth pressure gauge to the face side along the hollow path to set the earth pressure detection position.

  According to the first aspect of the present invention, since the earth pressure gauge can be taken out through the cylinder inside the mud pressure shield machine, the earth pressure gauge of the mud pressure shield machine can be easily replaced. Become.

  According to the second aspect of the present invention, when the earth pressure gauge is taken out to the inside of the machine, the fluid substitution material is injected into the space opposite to the earth pressure gauge, so that the earth and sand on the face side passes through the through hole of the partition wall. It becomes possible to suppress or prevent entry.

It is the block diagram which looked at the inside of the mud pressure shield machine which concerns on one embodiment of this invention through the side. (A) is the front view of the cutter head of the mud pressure shield machine of FIG. 1, (b) is the block diagram which looked at the position A of the mud pressure shield machine of FIG. 1 from the direction shown by the arrow. It is the top view which expanded and showed the principal part of the partition of the mud pressure shield machine of FIG. It is the block diagram which expanded and showed the partition of the mud pressure shield machine of FIG. 1, and its front and back. (A) is sectional drawing of the earth pressure detection part of the mud pressure shield machine of FIG. 1, (b) is an exploded sectional view of the earth pressure detection part of (a). (A) is sectional drawing of the earth pressure detection part in the exchange process of the earth pressure gauge of the mud pressure shield machine of FIG. 1, (b) is a cross section of the earth pressure detection part in the exchange process of the earth pressure gauge following (a). FIG. (A) is sectional drawing of the earth pressure detection part in the exchange process of the earth pressure gauge following FIG. 6, (b) is sectional drawing of the earth pressure detection part in the exchange process of the earth pressure gauge following (a). (A) is sectional drawing of the earth pressure detection part in the exchange process of the earth pressure gauge following FIG. 7, (b) is sectional drawing of the earth pressure detection part in the exchange process of the earth pressure gauge following (a).

  Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

  FIG. 1 is a block diagram showing the interior of the mud pressure shield machine according to the present embodiment as seen through the side, FIG. 2 (a) is a front view of the cutter head of the mud pressure shield machine of FIG. ) Is a block diagram showing the position A of the mud pressure shield machine in FIG. 1 as viewed from the direction indicated by the arrow, and FIG. 3 is an enlarged plan view showing the main part of the partition wall of the mud pressure shield machine in FIG. 4 is an enlarged view of the partition wall of the mud pressure shield machine shown in FIG. In addition, in FIG. 3, the inside of the mud pressure shield machine is shown through.

  The mud pressure shield machine 1 according to the present embodiment generates mud having imperviousness and plastic fluidity by injecting an additive into the earth and sand excavated by the cutter head 2, and kneading the mud. It is a device that creates a mud pressure by digging in a state where the room between the cutter head 2 and the device body 3 is filled, and constructing a drilling mine in a state where the mud pressure is opposed to the earth pressure of the face, Particularly, it is suitable for excavating a natural ground including a boulder mixed gravel layer or a boulder layer mixed with boulders. Of course, the present invention may be applied to a boulder-mixed gravel layer, a cobblestone layer or a normal gravel layer in which no boulders are mixed.

  The outer diameter of the mud pressure shield machine 1 is, for example, about 5900 mm. The captain of the mud pressure shield machine 1 is, for example, about 7140 mm. Further, the operation of the mud pressure shield machine 1 is controlled by the driver in the driver's cab in a succeeding carriage (not shown) disposed behind the mud pressure shield machine 1.

  The cutter head 2 is a member that excavates the face of a natural mountain, and is installed on the front surface of the apparatus main body 3 so as to be rotatable along the circumferential direction of the cutter head 2. For the cutter head 2, for example, a disc-shaped spoke type is adopted. That is, as shown in FIG. 2A, the cutter head 2 includes a central hub portion 2a, six spoke portions 2b extending radially from the hub portion 2a toward the outer periphery, and the extension direction of the spoke portions 2b. An intermediate ring portion 2c that connects the midway portions, an outer peripheral ring portion 2d that connects the tip portions of the spoke portions 2b, and a through hole 2e formed between these members are provided.

  A center bit 4 a is attached to the hub portion 2 a at the center of the cutter head 2. A plurality of bits 4b are regularly mounted side by side on each spoke 2b. Note that other excavation members such as cone head type roller bits may be attached to the hub portion 2a. In addition to the bit 4b, another excavating member such as a roller bit may be attached to the spoke portion 2b.

  The hub portion 2a and the spoke portion 2b are provided with additive injection portions 5a1, 5a2, 5a3, and 5a4. The additive injecting portions 5a1 to 5a4 are components that inject a mud clay material such as bentonite-based additive toward the front face of the cutter head 2. In addition, as an additive injected from each of the additive injection portions 5a1 to 5a4, a bubble material may be used instead of a bentonite-based additive, or both a bentonite-based additive and a bubble material are used. May be.

  A limiting protrusion 2f is provided at the center between the adjacent spoke portions 2b, 2b in the intermediate ring portion 2c. The earth and sand excavated by the cutter head 2 is taken into a chamber 6 (see FIG. 1), which will be described later, through the through hole 2e, but the restricting projection 2f regulates the opening area of the through hole 2e, so This is a part that restricts cobblestone or the like from entering the chamber 6 through the through hole 2e. A bit 4b is also provided on the surface of the limiting protrusion 2f.

  In the outer peripheral ring portion 2d, a plurality of bits 4c are mounted side by side with their blades facing the outer peripheral side on the front surface on the face side. Further, for example, two copy bits 4d are mounted on the outer peripheral surface of the outer peripheral ring portion 2d at positions opposite to each other. The copy bit 4d has a role of performing excavation at the time of sharp curve construction, attitude control of the mud pressure shield machine 1 and the like.

  On the other hand, as shown in FIG. 1, the device main body 3 includes a front trunk plate 3a of a girder part and a rear trunk plate 3b of a tail part behind the girder part. The front body plate 3 a and the rear body plate 3 b are formed of, for example, a cylindrical steel plate, and are members that form an outer shape of the device body 3 and form a hollow space inside the device body 3. The front torso plate 3a and the back torso plate 3b are engaged by entering with the front end portion of the back torso plate 3b in contact with the inner peripheral surface of the front torso plate 3a on the rear end side of the front torso plate 3a. .

  On the front side of the front body plate 3a, a partition wall 7 is provided at a position retracted from the front side to the inside of the device main body 3 to divide the hollow space in the device main body 3 into the face side and the machine inside. The chamber 6 is provided on the face side of the partition wall 7, that is, between the cutter head 2 and the partition wall 7, and an additive material injection portion 5 b, a cutter driver 8, An intermediate jack 9a, a shield jack 9b, a screw conveyor 10, and an earth pressure detector 11 are provided.

  The additive injection portion 5b is a device for injecting the additive toward the outside of the device main body 3 or into the chamber 6, and the partition wall in a state where the injection port of the additive injection portion 5b is exposed to the outside of the device main body 3. 7 is provided in the vicinity of the outer periphery. For the additive material injected from the additive material injection portion 5b, a mud clay material such as bentonite-based additive material is used, for example. As the additive injected from the additive injection part 5b, a bubble material may be used instead of the bentonite additive, or both a bentonite additive and a bubble material may be used.

  The chamber 6 is a space into which earth and sand excavated by the cutter head 2 is taken. In the chamber 6, columnar mixing blades 15 a and 15 b projecting into the chamber 6 are provided on the front surface of the partition wall 7, while the columnar shape projecting into the chamber 6 on the back surface of the cutter head 2. Equivalent mixing blades 16a and 16b are provided. These kneading blades 15a, 15b, 16a, and 16b are offset in the radial direction of the cutter head 2, and when the cutter head 2 rotates, the sand that has entered the chamber 6 and the additive injected into the chamber 6 are added. It has the role of mixing and stirring materials.

  Further, the mixing blade 15 b provided on the center side in the plane of the partition wall 7 also serves as an additive injection portion for injecting an additive material into the chamber 6 from the tip side thereof. For example, a bubble material is used as the additive injected from the mixing blade 15b. In addition, as an additive injected from the mixing blade 15b, a bentonite-based additive may be used instead of the bubble material, or both a bentonite-based additive and a bubble material may be used.

  The cutter driver 8 is a drive source that rotates the cutter head 2. Here, an intermediate support driving method is exemplified as the cutter driving method, and the cutter driving body 8 is located at a substantially central position between the center and the outer periphery of the cutter head 2 as shown in FIGS. 1 and 3. A plurality of the cutter heads 2 are arranged along the circumferential direction of the cutter head 2.

  The middle-folded jack 9a is a device that connects the front trunk plate 3a and the rear trunk plate 3b and corrects the propulsion direction of the mud pressure shield machine 1 and, as shown in FIG. A plurality of them are arranged side by side along the circumferential direction of the mud pressure shield machine 1 at a position straddling the boundary between the trunk plate 3a and the rear trunk plate 3b. A mud pressure shield is provided by propelling the mud pressure shield machine 1 in a state where pressure oil is supplied to the bent jack 9a and the front body plate 3a and the rear body plate 3b are refracted in a predetermined direction and angle. It is possible to control the propulsion direction of the excavator 1.

  The shield jack 9b is a device that generates a propulsive force for advancing the mud pressure shield machine 1 by applying a reaction force to the segment SG installed behind the device body 3. As shown in FIG. As shown in FIG. 2B and FIG. 3, a plurality of lines are arranged along the circumferential direction of the mud pressure shield machine 1 at a position across the boundary between the front body plate 3 a and the rear body plate 3 b in the main body 3. Has been placed.

  The screw conveyor 10 is a device for discharging the earth and sand taken into the chamber 6 to the outside of the machine, and is disposed in the chamber 6 through the partition wall 7 at the bottom of the device body 3 as shown in FIG. It is provided in a state of continuously extending obliquely upward from the earth and sand intake end portion 10a toward the discharge end portion 10b disposed at a position slightly higher than the center in the height direction of the device main body 3 at the rear of the device main body 3. Yes.

  As the screw conveyor 10, for example, a ribbon screw conveyor having a spiral blade 10c having no rotation axis in a pipe is used. In the case of a screw conveyor having a rotating shaft, it is easily blocked by gravel, etc., whereas in the case of a ribbon screw conveyor 10, the maximum diameter of gravel etc. that can be conveyed can be made larger than the radius of the conveyance path, Gravels and the like that cannot be transported by a screw conveyor having a shaft can be transported. Thereby, in the mud pressure shield machine 1 of this Embodiment, it becomes a structure which can be taken in in the chamber 6, without crushing the cobblestone etc. of the magnitude | size which can be discharged | emitted with the screw conveyor 10. FIG.

  Note that a discharge pipe (not shown) is connected to the discharge end 10b of the screw conveyor 10, and the earth and sand conveyed to the discharge end 10b of the screw conveyor 10 passes through the discharge pipe to a slip-out unloading cart (not shown). ) And so on.

  As shown in FIGS. 3 and 4, the earth pressure detection unit 11 includes an earth pressure gauge 11 a and an earth pressure gauge exchange device 11 b that exchanges the earth pressure gauge 11 a. The earth pressure gauge 11a is a sensor portion that converts the pressure due to mud in the chamber 6 into an electric signal through a strain gauge, and is arranged with its earth pressure detection surface facing the chamber 6 side. The earth pressure detection surface of the earth pressure gauge 11a is covered with a protective member made of silicon resin or the like.

  Here, as shown in FIG. 3, the earth pressure detectors 11 are arranged in the vertical and horizontal directions in the plane of the partition wall 7. Thereby, the measurement accuracy of the mud pressure in the chamber 6 is improved. The earth pressure detection unit 11 may be arranged at least at one place, but it is preferable that the earth pressure detection unit 11 is arranged above and below the surface of the partition wall 7 because the difference in mud pressure between the upper and lower surfaces in the partition wall 7 is large. In addition, in FIG. 3, the earth pressure detection part 11 below in the surface of the partition 7 is abbreviate | omitting illustration.

  Next, the configuration of the earth pressure gauge changing device of the earth pressure detecting unit 11 will be described with reference to FIG. 5A is an enlarged cross-sectional view of the earth pressure detection unit of the mud pressure shield machine of FIG. 1, and FIG. 5B is an exploded cross-sectional view of the earth pressure detection unit of FIG. In FIG. 5, the left side of the partition wall 7 is the chamber, and the right side is the cabin.

  The earth pressure gauge exchanging device 11b includes a seal housing (cylinder) 11bh, a gate valve (opening / closing means) 11bp, a earth pressure gauge bracket (holding member) 11bb, an injection pipe (injection means) 11bt, and an opening / closing valve (injection means). 11bc.

The seal housing 11bh is a hollow member that is provided so as to communicate with the through hole 7a of the partition wall 7 and forms a hollow path 11br (see FIG. 5B) extending from the through hole 7a toward the inside of the machine. A seal member 11bs is joined to the rear end surface of the seal housing 11bh. The through hole 7a is a hole that penetrates the chamber 6 and the interior of the machine, and is formed in a planar circular shape, for example.
The gate valve 11bp is a valve that opens and closes the hollow path 11br in the seal housing 11bh, and is provided at a midpoint of the seal housing 11bh. The gate valve 11bp includes a valve body Vb, a valve seat Vs, a valve rod Vr, and a handle portion Vh. The valve body Vb moves up and down in the seal housing 11bh according to the rotation direction of the handle portion Vh. The hollow path 11br is opened and closed.

  The earth pressure gauge bracket 11bb is a member that holds the earth pressure gauge 11a, and is provided so as to be movable along the hollow path 11br. The earth pressure gauge 11a can be inspected and replaced by moving the earth pressure gauge bracket 11bb to the inside of the machine and taking out the earth pressure gauge 11a.

  At the rear end of the earth pressure gauge bracket 11bb, a flange portion 11bf protruding in the radial direction of the hollow path 11br is provided. By this flange portion 11bf, movement of the earth pressure gauge bracket 11bb to the face side is suppressed, and a position (earth pressure detection position) on the face side of the earth pressure gauge 11a is set. Here, the position of the earth pressure detection surface of the earth pressure gauge 11a is arranged at a position retracted by a predetermined dimension in the in-machine direction from the surface of the partition wall 7 on the chamber 6 side. Thereby, it is possible to suppress or prevent the contact of boulders or cobblestones with the earth pressure detection surface of the earth pressure gauge 11a.

  When the earth pressure gauge bracket 11bb is moved to the inside of the machine, as will be described later, a stopper for guiding the movement of the earth pressure gauge bracket 11bb and stopping the earth pressure gauge bracket 11bb from jumping to the machine inside is shown in FIG. (Not shown) is attached.

  The injection pipe 11bt is a pipe for injecting a fluid replacement material into a space formed on the opposite side of the earth pressure detection surface by the movement of the earth pressure gauge 11a when the earth pressure gauge 11a is taken out by the earth pressure gauge bracket 11bb. is there. This is a configuration for suppressing or preventing mud soil in the chamber 6 opposite to the earth pressure gauge 11a from entering the seal housing 11bh through the through hole 7a when the earth pressure gauge 11a is moved to the inside of the machine. For this reason, the injection port on the hollow path 11br side of the injection pipe 11bt is provided in a position as close to the face side as possible in the hollow path 11br.

  Here, one injection port on the hollow channel 11br side of the injection tube 11bt is provided on the lower side of the through hole 7a, but it may be provided on either the upper side, the right side or the left side of the through hole 7a. A plurality of tubes 11bt and their inlets may be dispersed. When the injection port of the injection tube 11bt is provided on the upper side of the through hole 7a, since the injection direction of the additive material follows the gravity, the supply pressure of the additive material can be reduced, and downsizing of the pump for supplying the additive material can be promoted. . In addition, when the injection port of the injection tube 11bt is provided on the upper side of the through hole 7a or when a plurality of injection ports are dispersed along the inner periphery of the through hole 7a, the additive material into the space opposite to the earth pressure gauge 11a The filling speed can be increased. Further, when a plurality of injection pipes 11bt and their injection ports are dispersed, an additive can be injected from the other injection pipe 11bt or the injection port even if one of the injection pipes 11bt or the injection port is clogged. Therefore, the occurrence rate of failure due to the clogging can be reduced.

  As the replacement material, the aforementioned bentonite-based additive, bubble material, or both are used. The on-off valve 11bc is a valve that opens and closes the injection pipe 11bt, and is provided at a midpoint of the injection pipe 11bt.

  Next, the mud pressure shield construction method using the mud pressure shield machine 1 shown in FIG. 1 will be described.

  In the mud pressure shield machine 1 of the present embodiment, the excavation resistance is constructed in the ground by pushing the cutter head 2 against the face and rotating the device main body 3 while rotating it. Here, for example, a natural ground in which fine particles (sand content) having a particle diameter of less than 2 mm do not exceed 20% and gravel stones (gravel content) having a particle diameter of 2 mm or more exceed 80% is targeted for excavation.

  During the excavation work, the additive is added to the earth and sand excavated by the cutter head 2, and the earth and the additive are agitated by the rotation of the cutter head 2 and the operation of the mixing blades 16a and 16b that follow the rotation. Mixing to convert excavated sediment into mud with plastic fluidity and imperviousness. Then, the mud is filled in the chamber 6 and the screw conveyor 10, and the filled mud is pressurized by the propulsion force of the shield jack 9 b to generate mud pressure, and this mud pressure is made to counteract the earth pressure of the face. Keep the face stable. Further, in order to maintain the stability of the face, for example, the rotational speed of the cutter head 2 is made constant, the extension speed of the shield jack 9b and the rotational speed of the screw conveyor 10 are adjusted, and the mud pressure in the chamber 6 is measured by the above earth pressure gauge. Measure by 11a so that it is constant.

  Bentonite-based additive (sludge material) added as an additive has the effect of improving the plastic fluidity and imperviousness of the earth and sand, and envelops gravel such as crushed gravel and cobblestone with excavated earth and sand. It has the effect of improving the integrity of the excavated sediment and gravel so that the gravel is not separated from the excavated sediment.

  On the other hand, the foam material added as an additive has a separating action for suppressing the above-mentioned gravel from adhering to the cutter head 2 and the partition wall 7, and excavated sediment and mud clay by a cushioning action that cannot be obtained with a bentonite-based additive. Increases the compressibility of the material, suppresses the gravel from rolling and moving in the chamber 6 and the screw conveyor 10, and even if it moves, it has the effect of suppressing sudden fluctuations in mud pressure by cushioning. ing.

  For this reason, even when excavating a cobble with a boulder-mixed boulder layer or a boulder layer where boulders that are not preferable to be taken into the chamber 6 are excavated, the mud pressure can be stabilized, and the stability of the face is achieved. In addition, the gravel drainage by the screw conveyor 10 can be smoothly moved to prevent the occurrence of clogging and the occurrence of ejection.

  Next, a method of replacing the earth pressure gauge 11a of the mud pressure shield machine 1 will be described with reference to FIGS. 6-8 is sectional drawing of the earth pressure detection part in the replacement | exchange process of an earth pressure gauge.

  First, after the excavation operation of the mud pressure shield excavator 1 is stopped, as shown in FIG. 6A, a stopper 11bd for earth pressure gauge replacement is mounted on the rear end surface of the seal housing 11bh.

  The stopper 11bd includes a bolt part Sv and a nut part Sn. The bolt part Sv is a member that guides the movement of the earth pressure gauge bracket 11bb, and a female screw hole formed in the rear end surface of the seal housing 11bh through the through hole formed in the flange part 11bf and the seal member 11bs at the tip of the bolt part Sv. Are attached to the seal housing 11bh.

  The nut portion Sn is screwed into the bolt portion Sv behind the flange portion 11bf of the earth pressure gauge bracket 11bb, and is a member that prevents the earth pressure gauge bracket 11bb from jumping out toward the inside of the machine.

  At this stage, the gate valve 11bp of the seal housing 11bh is opened. Further, the on-off valve 11bc of the injection tube 11bt is closed.

  Subsequently, as shown in FIG. 6 (b), the earth pressure gauge bracket 11bb is pulled backward on the inside of the machine to move the earth pressure gauge 11a to the machine inside, and the earth pressure gauge 11a is formed on the side opposite to the earth pressure detection surface. The additive (substitution material) Ad is injected into the space to be formed through the injection tube 11bt.

  At this time, if the additive material Ad is not injected into the space formed on the opposite side of the earth pressure detection surface by the movement of the earth pressure gauge 11a, mud in the chamber 6 enters the seal housing 11bh through the through hole 7a. On the other hand, in the present embodiment, the mud in the chamber 6 is sealed through the through hole 7a by injecting the additive material Ad into the space formed on the opposite side of the earth pressure detection surface by the movement of the earth pressure gauge 11a. The entry into the housing 11bh can be suppressed or prevented.

  Further, since the rear end side of the earth pressure gauge bracket 11bb is held by the nut portion Sn, the earth pressure gauge bracket 11bb is caused by the pressure of the additive Ad injected into the space formed on the opposite side of the earth pressure detection surface of the earth pressure gauge 11a. It is possible to prevent jumping out to the inside of the aircraft.

  Subsequently, as shown in FIG. 7A, the earth pressure gauge 11a is further moved to the inside of the machine while injecting the additive Ad into the space opposite to the earth pressure gauge 11a, and the position of the earth pressure gauge 11a is more than the gate valve 11bp. When it is located behind (inside the machine), the gate valve 11bp is closed.

  Subsequently, after closing the gate valve 11bp, as shown in FIG. 7B, the earth pressure gauge 11a is completely removed from the seal housing 11bh and replaced with a normally functioning earth pressure gauge 11a. In addition, it is the same as the above when checking the earth pressure gauge 11a.

  Next, as shown in FIG. 8A, after mounting the normal earth pressure gauge 11a on the earth pressure gauge bracket 11bb, the normal earth pressure gauge 11a is inserted into the seal housing 11bh, and the valve body Vb of the gate valve 11bp is inserted. Move to the previous position.

  Subsequently, after closing the on-off valve 11bc of the injection pipe 11bt, as shown in FIG. 8B, the gate valve 11bp is opened, the jack 20 or the like is applied to the rear end of the earth pressure gauge bracket 11bb, and the earth pressure gauge bracket 11bb. And the earth pressure gauge 11a is pushed toward the face side.

  At this time, the additive Ad opposite to the earth pressure detection surface of the earth pressure gauge 11a is returned to the chamber 6 side. The additive Ad on the opposite side of the earth pressure gauge 11a may be discharged from the injection tube 11bt. Further, a discharge pipe for discharging the additive Ad opposite to the earth pressure gauge 11a may be provided separately from the injection pipe 11bt, and the additive Ad may be discharged through the discharge pipe. In this case, the on-off valve 11bc of the injection pipe 11bt is closed and the on-off valve of the discharge pipe is opened. Thereby, it is possible to prevent the additive for injection and the additive to be discharged from being mixed. Further, by providing a discharge pipe for discharging the additive Ad, the pressing force when the earth pressure gauge bracket 11bb is inserted into the seal housing 11bh can be reduced, so that the workability of the replacement work of the earth pressure gauge 11a can be improved. it can.

  Further, an injection pipe 11bt for injecting the additive Ad may be provided in the upper part of the through hole 7a, and a discharge pipe for discharging the additive Ad may be provided in the lower part of the through hole 7a. In this case, since the injection direction and the discharge direction of the additive material follow the gravity, the additive material can be injected and discharged satisfactorily.

  Further, a plurality of discharge tubes and discharge ports for the additive material Ad may be dispersed. In this case, the failure rate due to clogging of the exhaust pipe can be reduced.

  As described above, the earth pressure gauge 11a can be exchanged safely and easily inside the machine. In the mud pressure shield excavator that does not have the earth pressure gauge exchanging device 11b described in the present embodiment, when the earth pressure gauge breaks down, the excavation operation of the shield excavator is stopped when replacing the earth pressure gauge, and a chemical solution or the like is provided on the face side. It is necessary to improve the ground to fix the excavated surface by injecting the soil and to discharge the soil in the chamber. For this reason, the exchanging work of the earth pressure gauge stops the excavation work for a long time, which is a factor hindering the long-distance construction of the shield machine. In particular, in excavation work in the formation where there are many cobblestones etc., even if measures such as filling a protective material such as silicon resin on the detection surface side of the earth pressure gauge are taken, cobblestone etc. will overload the earth pressure gauge. Since the occurrence frequency of earth pressure gauge failures is increased, how to facilitate replacement of earth pressure gauges and realize long-distance construction of shield machine is an important issue.

  On the other hand, in the mud pressure shield machine 1 according to the present embodiment, the earth pressure gauge 11a can be replaced inside the machine even if the operator does not enter the chamber 6 as described above. It can be exchanged safely and easily.

  Moreover, even if the earth pressure gauge 11a breaks down during excavation processing in the formation where there are many cobblestones etc., the earth pressure gauge 11a can be replaced immediately when necessary, so the long-distance construction of the mud pressure shield machine 1 can be realized. can do.

  Further, since excavation and earth removal can be performed while maintaining and maintaining the mud pressure in the chamber 6 at a predetermined value at all times, excavation work can be performed with the face always stable.

  Moreover, since the earth pressure gauge exchanging device 11b has a simple structure unlike the spherical seat type earth pressure gauge exchanging system, the earth pressure gauge exchanging apparatus 11b can be introduced into the mud pressure shield excavator 1 at low cost.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the embodiment disclosed in this specification is an example in all respects and is limited to the disclosed technology. It should be considered not a thing. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above-described embodiment, but should be construed according to the description of the scope of claims. All modifications are included without departing from the technical scope equivalent to the described technique and the gist of the claims.

  For example, in the above-described embodiment, the case where a ribbon screw type screw conveyor is used has been described. However, the present invention is not limited to this, and various modifications can be made. For example, a screw conveyor combining a ribbon type and a shaft type May be used.

  In the above description, the case where the present invention is applied to an intermediate support drive type mud pressure shield excavator has been described. However, the present invention is not limited to this, for example, a center shaft drive type or an outer periphery support drive type mud pressure shield. It is also applied to other mud pressure shield excavators such as excavators.

DESCRIPTION OF SYMBOLS 1 Mud pressure shield machine 2 Cutter head 3 Equipment body 6 Chamber 7 Bulkhead 7a Through-hole 11 Earth pressure detection part 11a Earth pressure gauge 11b Earth pressure gauge exchange device 11bh Seal housing 11br Hollow path 11bp Gate valve 11bb Earth pressure gauge bracket 11bb Flange part 11bt Injection Pipe 11bc On-off valve 11bd Stopper 20 Jack Sn Nut part Sv Bolt part

Claims (2)

A cylindrical body that is provided so as to communicate with a through hole that penetrates a partition wall that divides the inside of the equipment body of the mud pressure shield machine into a face side and an inside of the machine, and that forms a hollow passage extending from the through hole toward the inside of the machine When,
An opening / closing means provided at an intermediate position of the cylindrical body for opening and closing the hollow path;
In the cylinder, a holding member that is provided in a state of being movable along the hollow path, and that holds a soil pressure gauge disposed with the earth pressure detection surface facing the face side,
Injecting means for injecting a replacement material having fluidity into a space formed on the opposite side of the earth pressure gauge to the earth pressure detection surface in the hollow path,
A mud pressure shield excavator earth pressure gauge exchanging device characterized by comprising: In the cylinder forming a hollow path extending from the through hole penetrating the partition wall that divides the inside of the device body of the mud pressure shield machine into the face side and the inside of the machine, an earth pressure detection surface is provided on the face side. The earth pressure gauge arranged in a state of being directed is moved to the inside of the machine along the hollow path, and the fluid pressure is replaced in a space formed on the opposite side of the earth pressure detection surface by the movement of the earth pressure gauge Injecting the material;
A step of closing the opening and closing means when the earth pressure gauge is located inside the machine with respect to the opening and closing means provided in the middle position of the cylindrical body by the movement of the earth pressure gauge;
After closing the opening and closing means, moving the earth pressure gauge to the inside of the machine and taking it out of the cylinder and replacing it;
After replacing the earth pressure gauge, with the opening and closing means closed, inserting the replaced earth pressure gauge into the cylinder with the earth pressure detection surface facing the face side;
After inserting the replaced earth pressure gauge into the cylinder, opening the opening and closing means, moving the replaced earth pressure gauge to the face side along the hollow path, and setting the earth pressure detection position; ,
A method for replacing a earth pressure gauge of a mud pressure shield machine, characterized by comprising:

Images