JP7781496B2 - Installation method of the soil discharge pump that constitutes the soil discharge equipment of a shield tunneling machine - Google Patents

Description

The present invention relates to a method for installing an earth removal pump that constitutes the earth removal equipment of a shield tunneling machine .

A shield tunneling machine is an excavation machine that excavates the ground by pressing the cutter head attached to its front against the face of the ground and rotating while moving forward. The excavated soil and sand created in this way fills the chamber between the face and the partition wall of the shield tunneling machine, and the resulting earth pressure stabilizes the face while forming an excavated hole in the ground.

The excavated soil and sand excavated by this shield machine and filling the chamber is sent to a discharge pipe at the rear by a screw conveyor installed through the partition wall, and is then sent to the ground by a pressure pump connected to the discharge pipe. The pressure pumps include a pressure pump installed behind the screw conveyor and multiple relay pumps installed at regular intervals behind it. Shield machines are described, for example, in Patent Document 1.

JP 2015-21340 A

Since there are multiple trailing carriages between the pressure pump and the relay pump immediately behind it, the discharge pipe connecting the pressure pump and the relay pump immediately behind it is generally installed above the multiple trailing carriages. However, since the space above the trailing carriages is narrow and the usable area is limited, a pipe with a narrow inner diameter is used for the discharge pipe connecting the pressure pump and the relay pump immediately behind it.

As a result, the resistance to the flow of excavated soil increases in the discharge pipe connecting the pressure pump to the relay pump immediately behind it, shortening the distance over which the pressure pump can effectively transport excavated soil (discharge reach). However, since the distance at which the relay pump must be installed is determined by the discharge reach of the pressure pump, shortening the discharge reach poses the problem that an increase in the number of relay pumps installed in the excavation shaft is necessary. This problem becomes more pronounced as the number of trailing bogies increases, as the thin discharge pipes become longer.

The present invention was made in light of the above technical background, and aims to reduce the number of discharge pumps that make up the discharge equipment of a shield tunneling machine.

The method for installing an earth removal pump constituting the earth removal equipment for a shield tunneling machine of the present invention as set forth in claim 1 comprises the steps of: sending excavated earth and sand sent by a discharge means from a chamber of the shield tunneling machine by a first earth removal pump to a second earth removal pump through a first earth removal pipe arranged above a plurality of trailing carriages behind the discharge means; and sending the excavated earth and sand sent by the second earth removal pump to the ground by a second earth removal pipe and a plurality of relay earth removal pumps connected to the second earth removal pipe at predetermined distances; installing the second earth removal pump on the rearmost vehicle of the plurality of trailing carriages; and and a process of connecting a third soil discharge pipe having an inner diameter larger than that of the first soil discharge pipe between the rear end of the first soil discharge pipe and the second soil discharge pump, wherein the predetermined distance from the arrival shaft is a soil discharge reach distance, which is a distance at which the first soil discharge pump can effectively send mud to the second soil discharge pump that has been left behind when the shield tunneling machine reaches the arrival shaft .

The method for installing an earth removal pump that constitutes the earth removal equipment of a shield tunneling machine of the present invention described in claim 2 is characterized in that, in the invention described in claim 1 , it includes a process of installing the first earth removal pump in the leading vehicle of the multiple trailing bogies.

The method for installing an earth removal pump constituting the earth removal equipment of a shield tunneling machine of the present invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2 above, the shield tunneling machine is an earth pressure shield tunneling machine and the discharge means is a screw conveyor.

This invention makes it possible to reduce the number of discharge pumps that make up the discharge equipment of a shield tunneling machine.

1 is a side view showing the essential parts of an earth pressure shield tunneling machine according to an embodiment of the present invention. FIG. 2A is a front view of the cutter head of the earth pressure shield machine of FIG. 1, and FIG. 2B is a front view of the earth pressure shield machine of FIG. 1 as viewed from the direction indicated by the arrow at position A1. FIG. 2 is a side view of the essential parts of the mud pressure shield machine of FIG. 1 , showing the configuration including the soil removal equipment at the rear. FIG. 4 is a front view of the position A2 of the earth pressure shield machine in FIG. 3 as viewed from the direction indicated by the arrow. 4 is a front view of the position A3 of the mud pressure shield machine in FIG. 3 as viewed from the direction indicated by the arrow. 4 is a front view of the position A4 of the earth pressure shield machine of FIG. 3 as viewed from the direction indicated by the arrow. This is a side view of the main parts of the mud pressure shield machine of Figure 1, showing the configuration including the soil removal equipment through a see-through view during excavation work. 8 is a side view of the essential parts of the configuration including the earth removal equipment of the mud pressure shield machine of FIG. 1 during excavation work after the process of FIG. 7 is shown through.

An embodiment of the present invention will now be described in detail with reference to the drawings. In the drawings used to explain the embodiment, identical components will generally be designated by the same reference numerals, and repeated explanations will be omitted.

Figure 1 is a side view of the essential parts of the earth shield machine of this embodiment, with the essential parts visible through the viewfinder; Figure 2(a) is a front view of the cutter head of the earth shield machine of Figure 1; and Figure 2(b) is a front view of the earth shield machine of Figure 1, viewed from the direction indicated by the arrow at position A1.

The mud pressure shield machine 1 of this embodiment is an excavation machine that fills the chamber CR between the cutter head (cutter board) 2 and the main body 3 with soil and sand, and then injects and mixes the soil and sand to give it plastic fluidity (the ability to deform and move freely) and high water-tightness. It then uses this earth pressure to build an excavation shaft while stabilizing the face.

Although not particularly limited, the excavation outer diameter of the earth pressure shield machine 1 is, for example, approximately 5900 mm, and the machine length is, for example, approximately 7140 mm. The operation of the earth pressure shield machine 1 is controlled by an operator from within the cab of the trailing bogie SBx behind it. The overall operation of the earth pressure shield machine 1 is controlled by a control unit C located within the cab. This control unit C is electrically connected to a display unit D located within the cab, and various information sent from the control unit C is displayed on the display unit D.

The cutter head 2 is a component used to excavate the natural ground face and is installed on the front surface of the main body 3 in a state where it can rotate freely around the periphery of the main body 3. This cutter head 2 is, for example, a disk-shaped spoke-type cutter. As shown in FIG. 2(a), 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, an intermediate ring portion 2c connecting the midpoints of the spoke portions 2b in the extension direction, an outer ring portion 2d connecting the tips of the spoke portions 2b, and through holes 2e formed between these components. In this embodiment, by using a spoke-type cutter head 2 with a large opening ratio as an example, gravel can be introduced into the chamber CR without breaking it as much as possible.

Multiple cutter bits (hereinafter simply referred to as bits) 4a-4d are installed on the excavation surface of the cutter head 2. Bit 4a, known as the center bit, is installed in the central hub portion 2a of the cutter head 2. Multiple bits 4b are installed in a regular pattern on each spoke portion 2b. Note that other excavation components, such as cone head roller bits, may be installed on the hub portion 2a. In addition to bits 4b, other excavation components, such as roller bits, may be installed on the spoke portions 2b.

As shown in Figures 1 and 2(a), multiple bits 4c are mounted side by side on the front face of the outer ring portion 2d on the face side, with their blades facing the outer periphery. In addition, two bits 4d, known as copy bits, are installed on the outer periphery of the outer ring portion 2d, with each bit facing the opposite pole. These bits 4d are responsible for over-excavating when constructing sharp curves and for controlling the posture of the earth pressure shield machine 1.

As shown in FIG. 2(a), the hub portion 2a and the spoke portions 2b are provided with additive injection sections 5a1, 5a2, 5a3, and 5a4. These additive injection sections 5a1-5a4 are components that inject soil-making materials, such as bentonite-based additives, toward the cutting face at the front of the cutter head 2. They are arranged in a dispersed manner along different rotational trajectories within the front of the cutter head 2. This allows for more diversified control of additive injection, thereby enabling more accurate and efficient plastic fluidization of the excavated soil. The additive injection section 5a2 and the additive injection sections 5a3 and 5a4 are arranged separately on either side of the central additive injection section 5a1. This allows the additive to be distributed over a wider area within the front of the cutter head 2. The additive injected from each of the additive injection sections 5a1-5a4 may be aerated instead of bentonite-based additives, or both bentonite-based additives and aerated additives may be used.

A limiting protrusion 2f is provided in the middle of the intermediate ring portion 2c between adjacent spoke portions 2b, 2b. Soil excavated by the cutter head 2 is taken into the chamber CR (see Figure 1) through the through-hole 2e, but the limiting protrusion 2f restricts the opening area of the through-hole 2e, thereby preventing boulders and boulders from underground from entering the chamber CR through the through-hole 2e. A bit 4b is also provided on the surface of this limiting protrusion 2f.

As shown in Figure 1, the equipment body 3 comprises a forward fuselage plate 3a in the girder section and an aft fuselage plate 3b in the tail section behind it. The forward fuselage plate 3a and the aft fuselage plate 3b are formed, for example, from cylindrical steel plates, and are exterior bodies that form the outer shape of the equipment body 3 and create a hollow space inside the equipment body 3. The forward fuselage plate 3a and the aft fuselage plate 3b are engaged with each other by inserting the tip of the aft fuselage plate 3b into the aft end of the forward fuselage plate 3a while contacting the inner circumferential surface of the forward fuselage plate 3a.

On the front side of the front barrel plate 3a, at a position set back from the front into the main body 3, there is a partition plate (partition portion) 7 that divides the hollow space within the main body 3 into a face side and an inboard side. The chamber CR is located closer to the face than this partition plate 7 (i.e., the space between the cutter head 2 and the partition plate 7), and on the inboard side than the partition plate 7 there are an additive injection section 5b, a cutter driver 8, a center bending jack 9a, a shield jack 9b, and a screw conveyor 10.

The chamber CR is a space into which soil and sand excavated by the cutter head 2 are taken. Within this chamber CR, a cylindrical mixing rod 15 that protrudes into the chamber CR is provided on the front surface of the partition plate 7. In other words, the mixing rod 15 is fixed to the partition plate 7 and is immovable.

On the other hand, the back surface of the cutter head 2 is provided with a cylindrical or other shaped mixing rod 16R (rotating side) that protrudes into the chamber CR, and a triangular prism or other shaped mixing blade 16W. In other words, the mixing rod 16R and mixing blade 16W are fixed to the cutter head 2 and rotate with the rotation of the cutter head 2.

These mixing rods 15, 16R and mixing blades 16W have the role of mixing and stirring the soil and sand that has entered the chamber CR with the additives that have been injected into the chamber CR when the cutter head 2 rotates. The additives may also be injected from the mixing rod 15.

The additive injection section 5b is a section that injects additive toward the outside of the device main body 3 and into the chamber CR. It is located near the outer periphery of the partition plate 7, with the injection port of the additive injection section 5b exposed to the outside of the device main body 3. The additive injected from the additive injection section 5b is a mud-making material such as a bentonite-based additive. Note that aerated additive may be used instead of bentonite-based additive, or both aerated additive and bentonite-based additive may be used.

The cutter driver 8 is a drive source that rotates the cutter head 2. Here, an intermediate support drive system is used as the cutter drive system, and as shown in Figure 1, multiple cutter drivers 8 are arranged in a row along the circumferential direction of the cutter head 2, approximately in the center between the center of the front surface of the cutter head 2 and the outer periphery. The symbol 8TA indicates a torque arm.

The articulating jacks 9a are devices that connect the front and rear drum plates 3a and 3b and correct the forward movement direction of the earth shield machine 1. As shown in Figure 1, multiple articulating jacks 9a are arranged in a line along the circumferential direction of the earth shield machine 1, straddling the boundary between the front and rear drum plates 3a and 3b within the main body 3 of the equipment. By supplying pressure oil to these articulating jacks 9a and propelling the earth shield machine 1 with the front and rear drum plates 3a and 3b bent in a predetermined direction and angle, it is possible to control the forward movement direction of the earth shield machine 1.

The shield jack 9b is a device that generates a driving force to advance the earth pressure shield machine 1 by receiving a reaction force from the segment SG installed at the rear of the equipment main body 3. As shown in Figure 1, multiple shield jacks 9b are arranged in a row along the circumferential direction of the earth pressure shield machine 1 at a position straddling the boundary between the front body plate 3a and the rear body plate 3b within the equipment main body 3, as shown in Figure 2(b).

The screw conveyor 10 is a discharge means for discharging the soil and sand taken into the chamber CR outside the machine. As shown in Figure 1, it extends continuously diagonally upward from the soil and sand intake end 10a located inside the chamber CR through the partition plate 7 to the discharge rear end 10b located behind the main body 3 of the machine. While not particularly limited, the outer diameter of the screw conveyor 10 is, for example, approximately 850 mm.

For example, a ribbon-type screw conveyor is used as this screw conveyor 10. That is, a spiral blade 10c without a rotating shaft is installed in a freely rotatable state within the pipe of the screw conveyor 10. While screw conveyors with a rotating shaft are prone to clogging with pebbles, the ribbon-type screw conveyor 10 can transport pebbles with a maximum diameter equal to or greater than the radius of the transport path, making it possible to transport large pebbles that cannot be transported by screw conveyors with a rotating shaft. As a result, large pebbles can be discharged by the screw conveyor 10, and can be taken into the chamber CR without breaking them as much as possible.

The mud pressure shield machine 1 of this embodiment also includes sensor units such as an earth pressure detection unit and a temperature sensor (not shown). The earth pressure detection unit is a sensor unit that detects the pressure caused by the mud inside the chamber CR, and is installed with its earth pressure detection surface facing inside the chamber CR. This earth pressure detection unit can measure the mud pressure inside the chamber CR, and by managing the measured value to fall within a predetermined range, it is possible to proceed with the excavation process while ensuring the stability of the face.

The temperature sensors detect the temperature of the excavated soil (hereinafter referred to as soil temperature) and are installed within the front and outer periphery of the cutter head 2. The temperature sensors are composed of, for example, sheathed thermocouples. Temperature sensors composed of sheathed thermocouples are resistant to failure, do not take up much space, and are inexpensive, so multiple sensors can be installed on the cutter head 2. This improves the accuracy of measuring the soil temperature on the front and outer periphery of the cutter head 2. These multiple temperature sensors are distributed along different rotational trajectories within the front of the cutter head 2 (i.e., different radial positions of the cutter head 2).

The temperature sensor is also electrically connected to the control unit C (see Figure 1). The control unit C measures the soil temperature in real time, graphs (visualizes) the temperature distribution within the front and outer surfaces of the cutter head 2 based on the temperature information transmitted from the temperature sensor, and adjusts the injection conditions for the additive material.

Next, Figure 3 is a side view of the essential parts of the mud shield machine of Figure 1, showing through the configuration including the soil removal equipment at the rear; Figure 4 is a front view of position A2 of the mud shield machine of Figure 3, seen from the direction indicated by the arrow; Figure 5 is a front view of position A3 of the mud shield machine of Figure 3, seen from the direction indicated by the arrow; and Figure 6 is a front view of position A4 of the mud shield machine of Figure 3, seen from the direction indicated by the arrow.

As shown in Figures 3 to 6, the tunnel SH is an excavation tunnel excavated by an earth pressure shield machine 1, and two rails R1, R2 are laid within the tunnel SH along its width (horizontal direction in Figures 4 to 6). Each rail R1, R2 extends along the longitudinal direction of the tunnel SH. In addition, as shown in Figures 4 and 5, an underground air duct WD is installed on the ceiling of the tunnel SH, extending along the longitudinal direction of the tunnel SH.

Behind the screw conveyor 10 of the earth shield machine 1, multiple trailing carriages SB0, SB1 to SBn-1, SBn are arranged on rails R1, R1, so that they can move in accordance with the excavation operation of the earth shield machine 1. These trailing carriages SB0, SB1 to SBn-1, SBn are carriages equipped with the trailing equipment of the earth shield machine 1, such as crusher carriages, diverter carriages, operation carriages, shield hydraulic unit carriages, cutter hydraulic unit carriages, cutter oil tank carriages, control panel carriages, backfill plant carriages, rest carriages, toilet carriages, valve set carriages, transformer carriages, high-voltage cable carriages, low-voltage cable carriages, hose reel carriages, tail grease pump carriages, mud pump carriages, air pumping and material carriages, instrumentation cable carriages, capsule air pipe carriages, etc. Note that the trailing bogie SBx shown in Figure 1 is an operating bogie, and is one of the multiple trailing bogies SB0, SB1 to SBn-1, and SBn shown in Figure 3.

Furthermore, behind the screw conveyor 10 of the mud pressure shield machine 1, multiple transport carriages CB for transporting segments SG are arranged in a drivable state on rails R2, R2. In addition to segments SG, transport carriages CB may also transport materials such as rails, sleepers, pipes, or bolts. In addition, an electric locomotive (not shown), such as a battery locomotive, is arranged in a drivable state on rails R2, R2, and the transport carriages CB are towed by this battery loco.

The excavated soil produced by the excavation process using this earth pressure shield machine 1 is converted into plastically fluid and impermeable mud in the chamber CR, and then transported to the ground via the screw conveyor 10, multiple earth discharge pumps P0, P1, P2, and multiple earth discharge pipes EP0, EP1, EP2 that make up the earth discharge equipment RE. This significantly reduces the need for changes to the earth discharge equipment during initial start-up or construction of sharp curves compared to when transporting mud to the ground via a belt conveyor, improving construction efficiency. It also ensures ample space for assembling the segments SG, improving the work environment and safety. Furthermore, the earth discharge pipes EP0, EP1, EP2 extended rearward function as a watertight zone even under high water pressure, so combined with the watertight properties of the earth discharge pumps P0, P1, P2, construction can be carried out stably even under high earth pressure.

The discharge pipe EP0, connected to the discharge outlet at the rear end of the screw conveyor 10, is a pipe that connects the screw conveyor 10 to the discharge pump P0, and the mud transported by the screw conveyor 10 is sent to the discharge pump P0 through the discharge pipe EP0. The inner diameter of the discharge pipe EP0 is, for example, approximately 6 inches (152.4 mm).

The soil discharge pump (first soil discharge pump) P0 is a hydraulic primary pump for pressurizing mud to the rear soil discharge pump P1. The soil discharge pump P0 is mounted on the leading trailing carriage SB0 of the multiple trailing carriages SB0, SB1 to SBn-1, SBn. However, the soil discharge pump P0 may also be connected directly to the discharge outlet at the rear end of the screw conveyor 10.

The soil discharge pipe (first soil discharge pipe) EP1 connected to the discharge outlet of this soil discharge pump P0 is a pipe that connects the soil discharge pump P0 and the soil discharge pump P1, and the mud sent from the soil discharge pump P0 is sent to the soil discharge pump P1 through the soil discharge pipe EP1. This soil discharge pipe EP1 is installed above several trailing bogies SB1 to SBn-1, but because the space above the trailing bogies SB1 to SBn-1 is narrow and the usable area is limited (see Figure 5), it is made of piping with a narrow inner diameter. The inner diameter of the soil discharge pipe EP1 is the same as the inner diameter of the soil discharge pipe EP0 described above.

The soil discharge pump (second soil discharge pump) P1 is a hydraulic secondary pump for pressurizing mud to the rear soil discharge pump P2. In this embodiment, the soil discharge pump P1 is mounted on the rearmost trailing bogie SBn among the multiple trailing bogies SB0, SB1 to SBn-1, SBn, and moves together with the trailing bogie SBn.

The soil discharge pipe (second soil discharge pipe) EP2 connected to the discharge outlet of this soil discharge pump P1 is a pipe that transports the mud sent from the soil discharge pump P1 to the ground. As described above, in this embodiment, by mounting the soil discharge pump P1 on the rearmost trailing bogie SBn, a large installation space for the soil discharge pipe EP2 can be secured, so a pipe with a larger inner diameter than the soil discharge pipes EP0 and EP1 can be used as the soil discharge pipe EP2. The inner diameter of the soil discharge pipe EP2 is, for example, approximately 8 inches (203.2 mm).

Multiple soil discharge pumps P2 are connected to this soil discharge pipe EP2 at predetermined intervals. These multiple soil discharge pumps P2 are hydraulic relay pumps for pumping mud to the surface and are installed at the bottom of the tunnel SH. As described above, in this embodiment, the inner diameter of the soil discharge pipe EP2 can be increased, thereby reducing the resistance to mud flow within the soil discharge pipe EP2. This increases the distance over which mud can be effectively transported by the soil discharge pump P1 (soil discharge reach), allowing for longer installation distances for the relay soil discharge pumps P2. This allows for a reduction in the number of relay soil discharge pumps P2 installed within the tunnel SH. This reduces the labor required to install the relay soil discharge pumps P2. Furthermore, the total installation time for the relay soil discharge pumps P2 can be shortened, thereby shortening the excavation period. The distance L1 from the soil discharge pump P1 to the immediately succeeding soil discharge pump P2 (i.e., the installation distance of the relay soil discharge pump P2) is, for example, approximately 500 m.

These multiple soil discharge pumps P0, P1, and P2 are electrically connected to the control unit C of the trailing bogie SBx shown in Figure 1 and are centrally managed. In addition, a flow meter (not shown) is installed midway through each soil discharge pipe EP0, EP1, and EP2 to measure the flow rate of mud flowing through the pipe. This flow meter is electrically connected to the control unit C of the trailing bogie SBx shown in Figure 1, and its measurement value can be displayed on the display unit D and the flow rate data can be recorded in the recording unit.

Sludge pumps, for example, are used as the soil discharge pumps P0, P1, and P2. Sludge pumps are fully hydraulic double-piston pumps with a so-called swing valve system, which means they have a simple mechanism, few consumables, and are easy to maintain. A wide range of models are available, from small to large capacities, making them suitable for a wide range of tunnel construction projects, from small to large diameters. A special automatic adjustment ring is also attached to the swing valve, providing excellent sealing properties and making them suitable for pumping mud and other materials. It is also possible to detect soil discharge from the screw conveyor 10 and link the soil discharge pumps P0, P1, and P3.

Next, an example of an earth pressure shield tunneling method using the earth pressure shield machine 1 of Figure 1 will be described with reference to Figures 7 and 8. Figures 7 and 8 are side views of the main parts of the earth pressure shield machine of Figure 1 during excavation work, showing through the configuration including the soil removal equipment.

As shown in Figure 7, the earth pressure shield machine 1 of this embodiment constructs an excavation shaft in the ground by pushing the cutter head 2 against the working face and rotating it while advancing the main body 3. While not particularly limited, the excavation target is, for example, a ground mass containing no more than 20% fine particles (sand fraction) with a particle size of less than 2 mm and more than 80% gravel (gravel fraction) with a particle size of 2 mm or more.

During this excavation work, the additives are added to the soil excavated by the cutter head 2. As shown in Figure 1, the rotation of the cutter head 2 rotates the mixing rods 16R and other components, stirring and mixing the soil and additives with the mixing rods 15, 16R to convert the excavated soil into mud with plastic fluidity and impermeability. The mud is then filled into the chamber CR and the screw conveyor 10, and the filled mud is pressurized by the driving force of the shield jack 9b to generate mud pressure. This mud pressure counteracts the earth pressure at the face, maintaining face stability. In this process, for example, the rotational speed of the cutter head 2 is kept 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 CR is measured by the earth pressure detector and maintained constant, thereby maintaining face stability.

The bentonite-based additive (mud-making material) added as an additive not only increases the plastic fluidity and impermeability of the soil, but also enhances the integrity of the excavated soil and gravel by enveloping crushed boulders, boulders, and other gravel components along with the excavated soil, preventing them from separating from the excavated soil. Meanwhile, the aerated material added as an additive not only has a separating effect by preventing the gravel components from adhering to the cutter head 2 and partition plate 7, but also provides a cushioning effect not available with bentonite-based additives, increasing the compressibility of the excavated soil and mud-making material and preventing the gravel components from rolling within the chamber CR and screw conveyor 10. Even if the gravel does roll, the cushioning effect also serves to suppress sudden fluctuations in mud pressure. As a result, even when excavating ground containing boulders and gravel layers or boulder layers containing boulders that are undesirable for being drawn into the chamber CR, mud pressure can be stabilized, maintaining face stability, and the screw conveyor 10 can smoothly move the gravel discharged from the excavator, preventing blockages and eruptions.

During excavation work, the mud inside the chamber CR of the earth pressure shield machine 1 is discharged by the screw conveyor 10 and sent via a discharge pipe EP0 to the discharge pump P0 of the leading trailing bogie SB0. The mud sent to this discharge pump P0 is then sent via a discharge pipe EP1 from the discharge pump P0 to the discharge pump P1 of the last trailing bogie SBn. The mud sent to this discharge pump P1 is then sent from the discharge pump P1 to a discharge pipe EP2, and is then sent to the ground by multiple discharge pumps P2 connected to the discharge pipe EP2 (see Figure 3).

Here, as the excavation operation of the earth pressure shield machine 1 progresses and the head of the earth pressure shield machine 1 reaches a predetermined distance L2 from the arrival shaft VH, the last trailing bogie SBn is detached from the group of multiple trailing bogies SB0 to SBn-1. Note that distance L2 is calculated, for example, by subtracting the distance traveled by the earth pressure shield machine 1 from the designed distance from the departure shaft to the arrival shaft VH.

Then, as shown in Figure 8, the earth pressure shield machine 1 excavates to carry out the excavation process. At this time, the multiple trailing bogies SB0 to SBn-1 behind the earth pressure shield machine 1 move forward as the shield machine 1 moves forward, but the last trailing bogie SBn is left behind without moving forward. In other words, by leaving the soil discharge pump P1 mounted on the last trailing bogie SBn behind, that soil discharge pump P1 is installed in the tunnel SH as a relay soil discharge pump.

In this case, the soil discharge pump P0 mounted on the leading trailing bogie SB0 of the multiple trailing bogies SB0 to SBn-1 is connected to the soil discharge pump P1 mounted on the trailing, last trailing bogie SBn that remains through soil discharge pipes EP1 and EP3. Because no trailing bogies are interposed between the trailing, last trailing bogie SBn-1 and the remaining trailing bogie SBn at this stage, ample space can be secured for the installation of the soil discharge pipe (third soil discharge pipe) EP3 between the trailing bogie SBn-1 and the trailing bogie SBn. Therefore, the inner diameter of the soil discharge pipe EP3 can be made larger than the inner diameters of the soil discharge pipes EP0 and EP1, thereby reducing the resistance to the flow of mud within the soil discharge pipe EP3. This increases the distance over which the soil discharge pump P0 can effectively transport mud (soil discharge reach distance), and increases the distance L3 from the soil discharge pump P0 to the soil discharge pump P1, allowing for a reduction in the number of relay soil discharge pumps P2 installed in the pit SH. This reduces the labor required to install the relay soil discharge pumps P2. Furthermore, the total installation time for the relay soil discharge pumps P2 can be shortened, thereby shortening the excavation period. The inner diameter of the soil discharge pipe EP3 is, for example, approximately 8 inches (203.2 mm). The distance L3 from the soil discharge pump P0 to the immediately following soil discharge pump P1 is, for example, approximately 200 to 300 meters.

The invention made by the inventor has been specifically described above based on the embodiments, but the embodiments disclosed in this specification are illustrative in all respects and are not limited to the disclosed technology. In other words, the technical scope of the present invention should not be interpreted restrictively based on the description of the above embodiments, but should be interpreted solely in accordance with the claims, and includes technologies equivalent to the technologies described in the claims and all modifications that do not deviate from the spirit of the claims.

In the above embodiment, we have described the application to a mud pressure shield machine, but this is not limited to this. For example, it can also be applied to a mud pressure shield machine that stabilizes the face by applying a predetermined pressure to the mud in the chamber and transports the excavated earth by circulating the mud. In this case, the discharge means for discharging the mud from the chamber is a mud discharge pipe.

In addition, while the above embodiment describes the use of a ribbon screw type screw conveyor, this is not limited to this and various modifications are possible. For example, a screw conveyor that combines a ribbon type and a shaft type may also be used.

The above explanation has been given of the application of the present invention to an intermediate support drive type earth pressure shield machine, but it is not limited to this and can also be applied to other shield machines, such as center shaft drive type or peripheral support drive type earth pressure shield machines.

1 Mud pressure shield machine 2 Cutter head 2a Hub portion 2b Spoke portion 2c Intermediate ring portion 2d Outer ring portion 2e Through hole 2f Limiting protrusion 3 Equipment body 4a to 4c Bit 4d Copy bit 5a1 to 5a4 Additive injection portion 5b Additive injection portion 7 Partition plate 15 Mixing rod 16R Mixing rod 16W Mixing blade CR Chamber SH Pit VH Arrival shaft SG Segment R1, R2 Rail SB0 to SBn, SBx Following cart C Control unit D Display unit CB Transport cart WD Mine wind pipe RE Soil discharge equipment P0, P1, P2 Soil discharge pump EP0, EP1, EP2, EP3 Soil discharge pipe

Claims (3)

When the excavated earth and sand sent from the chamber of the shield machine by the discharge means is sent by the first earth and sand pump to the second earth and sand pump through the first earth and sand pipe arranged above the multiple trailing carriages behind the discharge means, and when the excavated earth and sand sent by the second earth and sand pump is sent to the ground by the second earth and sand pipe and multiple relay earth and sand pumps connected at predetermined distances to the second earth and sand pipe,
a step of installing the second soil removal pump on the rearmost vehicle of the plurality of trailing bogies;
a process of moving the second soil discharge pump together with the plurality of trailing carriages before the shield tunneling machine reaches a predetermined distance from the arrival shaft, and detaching the rearmost vehicle from the plurality of trailing carriages and leaving it behind when the shield tunneling machine reaches a predetermined distance from the arrival shaft, thereby installing the second soil discharge pump mounted on the rearmost vehicle as the relay soil discharge pump;
A step of connecting a third discharge pipe having an inner diameter larger than that of the first discharge pipe between the rear end of the first discharge pipe and the second discharge pump;
and
The predetermined distance from the arrival shaft is an earth discharge reach distance, which is a distance at which the first earth discharge pump can effectively send mud to the remaining second earth discharge pump when the shield machine reaches the arrival shaft .
A method for installing an earth removal pump that constitutes the earth removal equipment of a shield tunneling machine. a step of installing the first soil removal pump in a leading car of the plurality of trailing bogies,
2. A method for installing an earth removal pump constituting the earth removal equipment of a shield tunneling machine according to claim 1. The shield machine is an earth pressure shield machine, and the discharge means is a screw conveyor.
3. A method for installing an earth removal pump constituting the earth removal equipment of a shield tunneling machine according to claim 1 or 2.