JP7535924B2 - Material Supply Device - Google Patents

Description

The present invention relates to a technology for supplying additives to excavated soil when a shield machine is used to excavate, and more specifically, to a material supply device that can supply materials from multiple locations using a multi-stage rotating body.

The shield tunneling method is a construction method for constructing underground railway tunnels, road tunnels, water supply and sewerage tunnels, utility conduits, and tunnels for power and communication by digging into the ground with a shield machine while stabilizing the tunnel face and lining it with segments. There are several methods for stabilizing the face during excavation. In the past, the compressed air method (open type) was used, but later, closed-type slurry shield tunneling methods came to be adopted, and in recent years, closed-type earth pressure shield tunneling methods in particular have been used frequently.

The slurry shield tunneling method uses slurry pressure instead of air pressure to stabilize the tunnel face, while the earth pressure shield tunneling method literally uses earth pressure to stabilize the tunnel face. Earth pressure shield tunneling is divided into two methods: earth pressure shield tunneling and slurry shield tunneling. Of these, the slurry shield tunneling method (especially the slurry shield tunneling method) is currently the mainstream, and accounts for a significant proportion of all shield tunneling methods, including the slurry shield tunneling method.

In the closed shield tunneling method, additives (also called mud materials) are added to the excavated soil and stirred with a cutter head or stirring mechanism, causing the excavated soil to become plastically fluid. The cutter chamber is then filled with the plastically fluidized excavated soil (mud), and pressure is applied to the mud by the driving force of the shield machine, which stabilizes the tunnel face as the tunnel advances.

During excavation, additives are supplied to the face to give the excavated soil plastic flow properties. Naturally, additives are selected appropriately according to the soil properties, and commonly used additives include bentonite, clay, polymeric materials, surfactant materials, and foam materials.

In addition to additives, various materials such as oils for cutter bits are sometimes supplied to the face of a shield machine. A rotary joint is usually used to supply additives and oils (hereinafter collectively referred to as "materials") to the face and cutter face. Traditionally, this rotary joint is attached to the center shaft (the rotating shaft of the cutter), and materials are supplied from inside the shield machine using piping inside the center shaft, cutter face plate, and cutter spokes as supply paths.

Because the limited space in a shield machine is utilized, it is often the case that only one rotary joint is installed, although this depends on the diameter of the shield machine, and therefore the number of supply channels (ports) depends on the rotary joint. In the case of a typical medium-diameter shield machine, the number of supply channel ports is one in the fishtail section and one or two on the outer periphery of the cutter spokes. In contrast, in the case of a large-diameter shield machine, the space inside the shield machine is larger, so there is room to install a rotary joint, but since the face area increases as the square of the shield diameter, a large number of supply channel ports are required.

However, depending on the construction site (symmetric tunnel), a large amount of material supply or the use of a variety of materials may be required. In recent years, direct cutting of earth retaining walls (earth retaining walls of the departure shaft and arrival shaft) and long-distance excavation are often required, and the height (length) dimensions of cutter bits (especially leading bits) tend to be large to prevent wear. For example, cutter bits with a height of 60 to 100 mm were often used in the past, but cutter bits with a height of 150 to 200 mm are now being used. In this case, the distance from the cutter face plate or cutter spoke to the tip of the cutter bit (i.e., the position of the natural ground) becomes long, so it is assumed that moisture and additives will not be sufficiently distributed in the cut soil, and the excavated soil will not become plastically fluidized (mudified). As a result, the cut soil is compressed by the driving force of the shield machine, and the meshing effect creates a great deal of resistance, which increases the cutter torque, increases the load on the cutter motor, and even increases the temperature of the cutter bearing seal, etc., which may make it impossible to excavate. To avoid this situation, it is a good idea to supply moisture and additives to the tip of the cutter bit as well.

When increasing the amount or variety of material supplied, or when supplying material to the tip of the cutter bit, more material supply ports are required, but there are cases where a single rotary joint does not have enough ports. In order to increase the number of material supply ports, it is possible to increase the number of injection pipes to the rotary joint by, for example, making the rotary joint longer, but this would occupy a large amount of the space behind the bulkhead inside the shield machine, which would affect the placement of other equipment, making it difficult in practice.

Therefore, there is a strong demand for technology that can increase the number of ports in the material supply passage without lengthening the rotary joint, and attempts have been made to solve this problem. For example, Patent Document 1 proposes a technology that uses a passage in the center rod to supply muddy material, and also supplies muddy material from the outer periphery by using a device fixed to the side of a rotatable ring-shaped shield frame.

JP 2003-193791 A

According to the technology disclosed in Patent Document 1, the number of ports for supplying material to the face increases. However, it is necessary to install a rotatable ring-shaped shield frame, and in addition to a rotary joint in the center rod, a supply device for the shield frame is also required, resulting in a significant increase in costs compared to conventional technology.

The objective of the present invention is to solve the problems inherent in the prior art, that is, to provide a material supply device that can increase the number of material supply paths compared to conventional rotary joints.

The present invention was developed with a focus on increasing the number of material supply paths by providing injection tubes inside the rotating outer wall that constitutes the rotor, and is an invention based on an unprecedented idea.

The material supply device of the present invention is a device that supplies material to the face side of a shield machine during excavation, and is equipped with a rotating body and a fixed body. The rotating body rotates with the rotating shaft, while the other fixed body is independent of the rotating shaft and does not rotate with it. The rotating body has a columnar rotating inner column, a cylindrical rotating outer wall arranged on the outer periphery of the rotating inner column, and a rotating bottom plate arranged on the front side of the excavation, and the rotating inner column and the rotating outer wall are attached to the rotating bottom plate, and a rotating side storage space is formed between the rotating inner column and the rotating outer wall. In contrast, the fixed body has a cylindrical fixed inner wall, a cylindrical fixed outer wall arranged on the outer periphery of the fixed inner wall, and a fixed bottom plate arranged on the rear side of the excavation, and the fixed inner wall and the fixed outer wall are attached to the fixed bottom plate, and a fixed side internal storage space is formed inside the fixed inner wall, and a fixed side storage space is formed between the fixed inner wall and the fixed outer wall. The rotor can rotate with the rotating inner column housed in the fixed-side internal storage space, the rotating outer wall housed in the fixed-side storage space, and the fixed inner wall housed in the rotating-side storage space. The side of the rotating outer wall is provided with one or more rotating outer circumferential grooves (endless band-shaped grooves that go around the side), and the inside of the rotating outer wall is provided with a rotating outer wall injection pipe that opens into the rotating outer circumferential groove, and the inside of the fixed outer wall is provided with a fixed outer wall injection pipe that opens at a position opposite the rotating outer circumferential groove. As a result, the material is injected into the rotating outer circumferential groove through the fixed outer wall injection pipe, and is further discharged to the face side through the rotating outer wall injection pipe.

The material supply device of the present invention can also be one in which one or more rotating inner circumferential grooves (endless band-shaped grooves that go around the side surface) are provided on the side surface of the rotating inner column, and an injection tube for the rotating inner column that opens into the rotating inner circumferential groove is provided inside the rotating inner column. In this case, an injection tube for the fixed inner wall that opens at a position opposite the rotating inner circumferential groove is provided inside the fixed inner wall. This allows the material to be injected into the rotating inner circumferential groove through the injection tube for the fixed inner wall, and then discharged to the face side through the injection tube for the rotating inner column.

The material supply device of the present invention can also be provided with two or more rotating outer wall injection pipes for each rotating outer peripheral groove.

The material supply device of the present invention can also be one in which one or more fixed outer peripheral grooves (endless band-shaped grooves that go around the side surface) are provided on the side surface of the fixed outer wall, and a fixed outer wall injection pipe that opens into the rotating outer peripheral groove is provided inside the fixed outer wall. In this case, a rotating outer wall injection pipe that opens at a position opposite the rotating outer peripheral groove is provided inside the rotating outer wall. This allows the material to be injected into the fixed outer peripheral groove through the fixed outer wall injection pipe, and then discharged to the face side through the rotating outer wall injection pipe.

The material supply device of the present invention can also be one in which one or more fixed inner circumferential grooves (endless band-shaped grooves that go around the side surface) are provided on the side surface of the fixed inner wall, and an injection pipe for the fixed inner wall that opens into the rotating inner circumferential groove is provided inside the fixed inner wall. In this case, an injection pipe for the rotating inner column that opens at a position opposite the rotating inner circumferential groove is provided inside the rotating inner column. This allows the material to be injected into the fixed inner circumferential groove through the injection pipe for the fixed inner wall, and then discharged to the face side through the injection pipe for the rotating inner column.

The material supply device of the present invention can also be provided with two or more rotating outer wall injection pipes for each fixed outer peripheral groove.

The material supply device of the present invention can also be one in which two or more rotating outer walls are formed on the rotating body, and two or more fixed outer walls are formed on the fixed body. In this case, a rotating-side storage space is also formed between the rotating outer walls, and a fixed-side storage space is also formed between the fixed outer walls. Then, the rotating body can rotate with the two or more rotating outer walls housed in the fixed-side storage space and the fixed outer walls (excluding the outermost fixed outer wall) housed in the rotating-side storage space.

The material supply device of the present invention can also be equipped with a tip injection pipe provided in the cutter face plate or cutter spokes. In this case, the tip injection pipe is connected to the discharge side opening of the rotating outer wall injection pipe. This allows the material to be discharged through the rotating outer wall injection pipe to the tip injection pipe, and then supplied to the face side of the shield machine during excavation.

The material supply device of the present invention can also have a tip injection tube that opens to the tip or side of the cutter bit.

The material supplying device of the present invention has the following advantages.
(1) It is possible to secure a larger number of material supply paths without being limited by the number of material supply paths of existing rotary joints. This allows the amount and variety of material to be increased. Also, by providing the opening of the tip injection pipe at the tip or side of the cutter bit, material can be supplied from the cutter bit close to the excavated ground in addition to supply from the cutter face plate and cutter spokes.
(2) By supplying material from the cutter bit, the plastic fluidization (mud formation) of the soil and sand immediately after cutting is promoted, which results in avoiding problems such as an increase in cutter torque and the resulting increased load on the cutter motor and an increase in temperature of the cutter bearing seals, etc., and ultimately enables stable shield tunneling.
(3) Since it enables more stable shield tunneling, it is possible to properly stabilize the tunnel face and prevent problems such as ground deformation and subsidence.

FIG. 1 is a cross-sectional view showing a schematic diagram of a material supplying device according to the present invention. 1A is a cross-sectional view showing a schematic view of the rotating body as viewed from the side, FIG. 1B is a cross-sectional view showing a schematic view of the rotating body as viewed from the front, and FIG. 1C is a plan view showing a schematic view of the rotating body as viewed from above. 13 is a plan view showing a schematic diagram of two rotating outer peripheral injection tubes installed for each rotating outer peripheral groove. FIG. (a) is a cross-sectional view showing a schematic of the fixed body as viewed from the side, (b) is a cross-sectional view showing a schematic of the fixed body as viewed from the front, and (c) is a partial cross-sectional view showing a schematic of the connection portion between the rotating outer peripheral groove and the fixed outer wall injection pipe. 1 is a side view showing a schematic diagram of a fixed outer peripheral injection tube whose starting end opens on an outer side surface and whose terminal end opens on an inner side surface. FIG. (a) is a cross-sectional view showing a rotating body without a rotating outer peripheral groove as viewed from the side, (b) is a cross-sectional view showing a fixed body with a fixed outer peripheral groove as viewed from the side, and (c) is a partial cross-sectional view showing a connection portion between the fixed outer peripheral groove and the injection tube for the rotating outer wall. FIG. 2A is a cross-sectional view showing a rotating body having a multi-stage outer wall as viewed from the side, and FIG. 2B is a cross-sectional view showing a fixed body having a multi-stage outer wall as viewed from the side. 13 is a partial cross-sectional view showing a state in which the terminal end of the tip injection tube opens to the tip or side of the cutter bit. FIG. FIG. 2A is a cross-sectional view showing the inside of a shield machine, and FIG. 2B is a partial cross-sectional view showing the material injection mechanism installed in the rotating ring.

An example of an embodiment of the material supply device of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a schematic diagram of the material supply device 100 of the present invention. The material supply device 100 is a device that supplies materials (additives, oils, etc.) to the face side of a shield machine during excavation, and as shown in this figure, is equipped with a rotating body 200 and a fixed body 300. The rotating body 200 is fixed to the rotating shaft 400, and therefore rotates around the axis together with the rotating shaft 400. On the other hand, the fixed body 300 is not fixed to the rotating shaft 400 (is independent), and does not rotate along with the rotating shaft 400 or the rotating body 200.

The rotating body 200 and the fixed body 300 are comb-shaped in cross section as shown in FIG. 1, and are arranged so that their comb-shaped portions interlock with each other, and are fixed, for example, to the bulkhead of the shield machine using bolts BN or the like. With the comb-shaped portions of the rotating body 200 and the fixed body 300 interlocked, the rotating body 200 rotates around its axis. For this reason, it is advisable to install a bearing BR between the rotating body 200 and the fixed body 300.

An injection pipe for injecting material is provided inside the fixed body 300, and an injection pipe is also provided inside the rotating body 200. As a result, material injected from the outside is supplied to the face side of the shield machine during excavation via the injection pipe in the fixed body 300 and then via the injection pipe in the rotating body 200. In addition, a belt-shaped groove is formed at the connection point between the injection pipe in the fixed body 300 and the injection pipe in the rotating body 200, and the material discharged from the injection pipe in the fixed body 300 is temporarily stored in this belt-shaped groove, and the stored material moves into the injection pipe in the rotating body 200 that opens into the belt-shaped groove. In addition, it is recommended to install a sealant at the connection point between the injection pipe in the fixed body 300 and the belt-shaped groove to prevent material leakage.

Below, we will explain in detail each of the main elements that make up the material supply device 100.

(rotating body)
FIG. 2 is a schematic diagram of the rotating body 200, where (a) is a cross-sectional view from the side, (b) is a cross-sectional view from the front (arrow A-A in FIG. 2(a)), and (c) is a plan view from above (arrow B-B in FIG. 2(a)). As shown in this figure, the rotating body 200 is composed of a columnar (cylindrical in the figure) rotating inner column 210 located in the center, a cylindrical (ring-shaped in cross-section) rotating outer wall 220 arranged on the outer periphery of this rotating inner column 210, and a plate-shaped (disc-shaped in the figure) rotating bottom plate 240 located in front of the excavation.

The rotating inner column 210 and the rotating outer wall 220 are arranged in a direction approximately parallel (including parallel) to the rotating shaft 400, while the rotating bottom plate 240 is arranged in a direction approximately perpendicular (including perpendicular) to the rotating shaft 400, and one end (left end in the figure) of the rotating inner column 210 and the rotating outer wall 220 is attached to the rotating bottom plate 240. As a result, the appearance of the rotating body 200 is a hollow cylinder with the rotating outer wall 220 as the side and the rotating bottom plate 240 as the bottom, with one side (right side in the figure) open, and the rotating inner column 210 is arranged in the center of this cylinder. Therefore, a cylindrical (ring-shaped in cross section) space (hereinafter referred to as the "rotating side storage space 230") is formed between the rotating inner column 210 and the rotating outer wall 220. The rotating body 200 can be produced by fabricating the rotating inner column 210, the rotating outer wall 220, and the rotating bottom plate 240 separately and then attaching the rotating inner column 210 and the rotating outer wall 220 to the rotating bottom plate 240, or the rotating body 200 can be produced by integrating the rotating inner column 210, the rotating outer wall 220, and the rotating bottom plate 240.

A band-shaped groove (hereinafter referred to as "rotary outer groove 222") is formed on the side of the rotating outer wall 220. As can be seen from FIG. 2(c), this rotating outer groove 222 is an endless groove that goes around the side of the rotating outer wall 220. Note that although three rotating outer grooves 222 are formed in FIG. 2, this is not limited to this, and one, two, or four or more rotating outer grooves 222 can also be formed. Furthermore, the rotating outer groove 222 can be formed on the outer side of the rotating outer wall 220, or instead (or in addition) on the inner side of the rotating outer wall 220.

A flow passage pipe (hereinafter referred to as "rotary outer wall injection pipe 221") for sending out the material is built into the inside of the rotating outer wall 220. The starting end of this rotating outer wall injection pipe 221 opens into the rotating outer peripheral groove 222, and the end end opens at a position penetrating the rotating bottom plate 240. In FIG. 2(a), the three rotating outer wall injection pipes 221 are shown overlapping for convenience, but as can be seen from FIG. 2(b) and FIG. 2(c), the rotating outer wall injection pipes 221 are arranged in the rotating outer wall 220 at separate positions. In addition, it is preferable to install the rotating outer wall injection pipe 221 for each rotating outer peripheral groove 222. For example, in the example of FIG. 2, one rotating outer wall injection pipe 221 is installed for each of the three rotating outer peripheral grooves 222 (i.e., a total of three places). Alternatively, as shown in FIG. 3, the rotating outer wall injection pipes 221 can be installed at multiple places (two places for each rotating outer peripheral groove 222). When multiple rotating outer wall injection pipes 221 are installed inside the rotating outer wall 220, they can all be designed to have the same diameter, or they can each be designed to have a different diameter depending on the type and amount of material being pumped out.

In addition to the side of the outer rotating wall 220, one or more band-shaped grooves (hereinafter referred to as "inner rotating groove 212") can be formed on the side of the inner rotating column 210 (in this case, the outer side). This inner rotating groove 212 is an endless groove that goes around the side of the inner rotating column 210, just like the outer rotating groove 222. When forming the inner rotating groove 212 on the side of the inner rotating column 210, it is preferable to incorporate a flow path pipe (hereinafter referred to as "injection pipe for inner rotating column 211") for sending out material inside the inner rotating column 210. Like the injection pipe for outer rotating wall 221, the injection pipe for inner rotating column 211 opens at its starting end in the inner rotating groove 212 and opens at its end end at a position penetrating the bottom plate 240. As can be seen from Figures 2(b) and 2(c), the injection tubes 211 for the rotating inner column are arranged in the rotating inner column 210 at separate positions, and may be installed at one or more locations relative to the rotating inner circumferential groove 212. When installing multiple injection tubes 211 for the rotating inner column in the rotating inner column 210, they can all be designed to have the same diameter, or they can each be designed to have a different diameter depending on the type and amount of material to be delivered.

(Fixed body)
4 is a diagram showing the fixed body 300, where (a) is a cross-sectional view seen from the side, (b) is a cross-sectional view seen from the front (arrow C-C in FIG. 4(a)), and (c) is a partial cross-sectional view showing a schematic connection between the rotating outer circumferential groove 222 and a fixed outer wall injection pipe 321 described later. As shown in this figure, the fixed body 300 is composed of a cylindrical (ring-shaped in cross-sectional view) fixed inner wall 310 located on the inside in cross-sectional view, a similarly cylindrical (ring-shaped in cross-sectional view) fixed outer wall 320 arranged on the outer periphery of the fixed inner wall 310, and a plate-shaped (disc-shaped in the figure) fixed bottom plate 340 located on the rear side of the excavation.

The fixed inner wall 310 and the fixed outer wall 320 are arranged in a direction approximately parallel (including parallel) to the rotating shaft 400, while the fixed bottom plate 340 is arranged in a direction approximately perpendicular (including perpendicular) to the rotating shaft 400, and one end (the right end in the figure) of the fixed inner wall 310 and the fixed outer wall 320 is attached to the fixed bottom plate 340. As a result, the appearance of the fixed body 300 is a hollow cylinder with the fixed outer wall 320 as the side and the fixed bottom plate 340 as the bottom, with one side (the left side in the figure) open, and the fixed inner wall 310 is arranged inside this cylinder. Therefore, a cylindrical (ring-shaped in cross section) space (hereinafter referred to as the "fixed side storage space 332") is formed between the fixed inner wall 310 and the fixed outer wall 320, and a columnar space (hereinafter referred to as the "fixed side internal storage space 331") is formed inside the fixed inner wall 310. The fixed inner wall 310, the fixed outer wall 320, and the fixed bottom plate 340 can be fabricated separately and then the fixed inner wall 310 and the fixed outer wall 320 can be attached to the fixed bottom plate 340 to fabricate the fixed body 300, or the fixed inner wall 310, the fixed outer wall 320, and the fixed bottom plate 340 can be fabricated as a single unit to fabricate the fixed body 300.

A flow path pipe (hereinafter referred to as "fixed outer wall injection pipe 321") for sending out material is built into the inside of the fixed outer wall 320. The end side end of this fixed outer wall injection pipe 321 opens on the side of the fixed outer wall 320 (the inner side in the figure), and the start side end opens at a position penetrating the fixed bottom plate 340. However, the end side end of the fixed outer wall injection pipe 321 (the opening position on the side of the fixed outer wall 320) is a position facing the rotating outer circumferential groove 222 (particularly, a position in the excavation direction) as shown in Figure 4 (c). Note that in Figure 4 (a), three fixed outer wall injection pipes 321 are shown overlapping for convenience, but as can be seen from Figure 4 (b), the fixed outer wall injection pipes 321 are arranged in the fixed outer wall 320 at positions separated from each other. In addition, the starting end of the fixed exterior wall injection pipe 321 can open at a position where it penetrates the fixed bottom plate 340, or it can open on a side surface different from the side surface where the ending end opens (the outer side surface in the figure) as shown in Figure 5.

It is also desirable to install a fixed outer wall injection pipe 321 for each rotating circumferential groove 222. For example, in the example of FIG. 4, one fixed outer wall injection pipe 321 is installed for each of the three rotating circumferential grooves 222 (i.e., a total of three locations). Alternatively, the fixed outer wall injection pipes 321 can be installed at multiple locations (e.g., two locations for each rotating circumferential groove 222). When multiple fixed outer wall injection pipes 321 are installed within the fixed outer wall 320, they can all be designed to have the same diameter, or they can each be designed to have a different diameter depending on the type and amount of material being pumped out.

In addition to the inside of the fixed outer wall 320, a flow passage pipe (hereinafter referred to as "fixed inner wall injection pipe 311") for sending out material can be built into the inside of the fixed inner wall 310. Like the fixed outer wall injection pipe 321, the end end of this fixed inner wall injection pipe 311 opens on the side of the fixed inner wall 310 (the inner side in the figure), and the start end opens at a position penetrating the fixed bottom plate 340. However, the end end of the fixed inner wall injection pipe 311 (the opening position on the side of the fixed inner wall 310) is a position facing the rotating inner circumferential groove 212 (particularly, a position in the excavation direction). In addition, the fixed inner wall injection pipes 311 are arranged in the fixed inner wall 310 at positions separated from each other as can be seen from FIG. 4 (b), and it is preferable to install them at one or more points relative to the rotating inner circumferential groove 212. When multiple fixed inner wall injection pipes 311 are installed inside the fixed inner wall 310, they can all be designed to have the same diameter, or they can each be designed to have a different diameter depending on the type and amount of material being pumped out.

As shown in FIG. 6(b), one or more strip-shaped grooves (hereinafter referred to as "fixed outer peripheral grooves 322") may be formed on the side (inner side or outer side) of the fixed outer wall 320, and one or more strip-shaped grooves (hereinafter referred to as "fixed inner peripheral grooves 312") may be formed on the side (inner side or outer side) of the fixed inner wall 310. The fixed outer peripheral groove 322 is an endless groove that goes around the side of the fixed outer wall 320, and the fixed inner peripheral groove 312 is an endless groove that goes around the side of the fixed inner wall 310. When forming the fixed outer peripheral groove 322 on the side of the fixed outer wall 320, the end side end of the fixed outer wall injection pipe 321 opens into the fixed outer peripheral groove 322, while the start side end of the rotating outer wall injection pipe 221 opens at a position facing the fixed outer peripheral groove 322 (particularly, in the excavation direction) as shown in FIG. 6(c). Similarly, when forming a fixed inner circumferential groove 312 on the side of the fixed inner wall 310, the end side end of the injection pipe 311 for the fixed inner wall opens into the fixed inner circumferential groove 312, while the start side end of the injection pipe 211 for the rotating inner column opens at a position opposite the fixed inner circumferential groove 312 (particularly, a position in the excavation direction).

When forming the fixed outer peripheral groove 322 on the side of the fixed outer wall 320, as shown in FIG. 6(a), only the injection pipe 221 for the rotating outer wall is provided on the rotating outer wall 220, and the rotating outer peripheral groove 222 can be omitted. Similarly, when forming the fixed inner peripheral groove 312 on the side of the fixed inner wall 310, as shown in FIG. 6(a), only the injection pipe 211 for the rotating inner column is provided on the rotating inner column 210, and the rotating inner peripheral groove 212 can be omitted. Of course, it is also possible to form the rotating outer peripheral groove 222 on the side of the rotating outer wall 220 and also form the fixed outer peripheral groove 322 on the side of the fixed outer wall 320, or to form the rotating inner peripheral groove 212 on the side of the rotating inner column 210 and also form the fixed inner peripheral groove 312 on the side of the fixed inner wall 310.

(Multi-stage exterior wall)
The rotating body 200 may also be provided with two or more (two in the figure) rotating outer walls 220 as shown in Fig. 7(a). As explained above, the rotating outer walls 220 have rotating outer circumferential grooves 222 formed on their side surfaces, and rotating outer circumferential injection pipes 221 are provided inside the rotating outer circumferential grooves 222. Note that the rotating body 200 provided with two or more rotating outer walls 220 has two or more rotating side accommodation spaces 230 (the same number as the rotating outer walls 220) formed therein.

When the rotating body 200 has two or more rotating outer walls 220, the fixed body 300 may also have two or more fixed outer walls 320 (two in the figure) as shown in FIG. 7(b). As described above, these multiple fixed outer walls 320 are provided with fixed outer wall injection pipes 321 inside, and fixed outer peripheral grooves 322 can be formed on their sides. In addition, a fixed body 300 with two or more fixed outer walls 320 has two or more fixed side accommodation spaces 332 (the same number as the fixed outer walls 320). In addition, since the rotating outer walls 220 are accommodated in the fixed side accommodation spaces 332 as described later, the number of fixed outer walls 320 of the fixed body 300 (i.e. the number of fixed side accommodation spaces 332) should be the same as the number of rotating outer walls 220 of the rotating body 200.

(Combination of Rotating Body and Fixed Body 300)
The rotating body 200 and the fixed body 300 are arranged to face each other and to mesh with each other as shown in Fig. 1. More specifically, the rotating body 200 and the fixed body 300 are combined so that the rotating inner column 210 of the rotating body 200 is accommodated in the fixed side internal accommodation space 331 of the fixed body 300, the rotating outer wall 220 of the rotating body 200 is accommodated in the fixed side accommodation space 332 of the fixed body 300, and the fixed inner wall 310 of the fixed body 300 is accommodated in the rotating side accommodation space 230 of the rotating body 200. In addition, when the rotating body 200 has two or more rotating outer walls 220 and the fixed body 300 has two or more fixed outer walls 320, the fixed outer walls 320 (excluding the fixed outer walls 320 located on the outermost side of the fixed outer walls 320) are also accommodated in the rotating side accommodation space 230.

The material supply device 100 in which the rotating body 200 and the fixed body 300 are arranged in this manner is fixed to, for example, the bulkhead of a shield machine using bolts BN or the like. Then, when the rotating body 200 and the fixed body 300 are engaged, the rotating body 200 rotates around its axis together with the rotating shaft 400. That is, the rotating inner column 210 rotates in the fixed side internal storage space 331 and the rotating outer wall 220 rotates in the fixed side storage space 332, so that the rotating body 200 rotates inside the fixed body 300. Also, as described above, the fixed body 300, which is independent of the rotating shaft 400, does not rotate with the rotating shaft 400 or the rotating body 200, but since the fixed inner wall 310 is housed in the rotating side storage space 230 or the fixed outer wall 320 is housed in the rotating side storage space 230, the fixed inner wall 310 and the fixed outer wall 320 do not become a barrier to the rotation of the rotating body 200.

(Tip injection tube)
The material supply device 100 may also be provided with one or more flow pipes (hereinafter referred to as "tip injection pipes 500") that send the material to the face side. The tip injection pipe 500 is piped in the cutter face plate or the cutter spokes, and its starting end is connected to the opening (discharge side opening) of the end end of the rotating outer wall injection pipe 221, and its end end opens at a position where it penetrates the cutter face plate or the cutter spokes. In addition, when the rotating inner column injection pipe 211 is built into the rotating inner column 210, another tip injection pipe 500 may be piped and its starting end may be connected to the discharge side opening of the rotating inner column injection pipe 211. As a result, the material discharged from the rotating inner column injection pipe 211 or the rotating outer wall injection pipe 221 flows into the tip injection pipe 500, and is further supplied to the face side of the shield machine during excavation via the piping in the cutter face plate or the cutter spokes.

The opening (discharge side opening) at the end of the tip injection pipe 500 can be provided on the front side (face side) of the excavation of the cutter face plate or cutter spoke, or on the tip or side of the cutter bit CB as shown in FIG. 8. In recent years, due to the trend of increasing the height (length) dimension of the cutter bit CB, the excavated soil does not become muddy enough due to a shortage of material (water and additives). As a result, the interlocking of the cut soil compressed by the driving force of the shield machine creates a lot of resistance, and various problems such as an increase in cutter torque have occurred. On the other hand, in the material supply device 100 of the present invention, the discharge side opening of the tip injection pipe 500 can be provided on the tip or side of the cutter bit CB, so that a sufficient amount of material is supplied to the excavated soil, and the above-mentioned problems can be avoided.

The material supply device 100 of the present invention can secure many more material supply paths than conventional devices, such as the rotating outer wall injection pipe 221 built into the rotating outer wall 220 and the rotating inner column injection pipe 211 built into the rotating inner column 210. In addition, the number of material supply paths can be further increased by using the rotating ring of the shield machine as shown in Figure 9. In Figure 9, a mechanism for injecting material into the face side (hereinafter referred to as the "material injection mechanism") is provided on the rotating ring that the shield machine originally has. The rotating ring rotates together with the cutter face plate and cutter spokes, and its inner circumference is supported by a fixed support that does not rotate.

As shown in FIG. 9(b), the material injection mechanism includes a fixed-side injection tube provided on the fixed support, a rotating-side injection tube provided inside the rotating ring, and a band-shaped groove formed on the inner surface of the rotating ring. The fixed-side injection tube performs the same function as the fixed outer wall injection tube 321 and the fixed inner wall injection tube 311 described so far, and the rotating-side injection tube performs the function of the rotating outer wall injection tube 221 and the rotating inner column injection tube 211, and the band-shaped groove performs the function of the rotating outer peripheral groove 222 and the rotating inner peripheral groove 212.

The material supply device of the present invention can be used when constructing underground road tunnels, as well as railway tunnels, tunnels for water and sewerage, utility conduits, and tunnels for power and communications. It can also be used with small- to large-diameter shield machines, or with slurry shield and earth pressure shield methods, and can be used with a wide range of soil types. Considering that the present invention can efficiently and safely construct social infrastructure such as tunnel structures, it can be said to be an invention that can be used not only industrially but also has the potential to make a significant contribution to society.

100 Material supply device of the present invention 200 Rotating body (of material supply device) 210 Rotating inner column (of rotating body) 211 Injection tube for rotating inner column (of rotating inner column) 212 Rotating inner circumferential groove (of rotating inner column) 220 Rotating outer wall (of rotating body) 221 Injection tube for rotating outer wall (of rotating outer wall) 222 Rotating outer circumferential groove (of rotating outer wall) 230 Rotating side accommodation space (of rotating body) 240 Rotating bottom plate (of rotating body) 300 Fixed body (of material supply device) 310 Fixed inner wall (of fixed body) 311 Injection tube for fixed inner wall (of fixed inner wall) 312 Fixed inner circumferential groove (of fixed inner wall) 320 Fixed outer wall (of fixed body) 322 Fixed outer circumferential groove (of fixed outer wall) 321 Injection tube for fixed outer wall (of fixed outer wall) 331 Fixed side internal accommodation space (of fixed body) 332 Fixed side accommodation space (of fixed body) 340 Fixed bottom plate (of fixed body) 400 Rotating shaft (of material supply device) 500 Tip injection pipe (of material supply device) BN Bolt BR Bearing CB Cutter bit

Claims (8)

A device for supplying materials including additives to the face side of a shield machine during tunneling,
A rotor that rotates together with a rotation shaft that rotates a cutter face plate of the shield machine ;
A fixed body independent of the rotating shaft,
The rotating body has a columnar rotating inner pillar fixed to the rotating shaft , a cylindrical rotating outer wall arranged on the outer periphery of the rotating inner pillar, and a rotating bottom plate arranged on the front side of the excavation, the rotating inner pillar and the rotating outer wall are attached to the rotating bottom plate, and a rotating side storage space is formed between the rotating inner pillar and the rotating outer wall,
The fixed body has a cylindrical fixed inner wall, a cylindrical fixed outer wall arranged on the outer periphery of the fixed inner wall, and a fixed bottom plate arranged on the rear side of the excavation, the fixed inner wall and the fixed outer wall are attached to the fixed bottom plate, a fixed side internal storage space is formed inside the fixed inner wall, and a fixed side storage space is formed between the fixed inner wall and the fixed outer wall,
The fixed body is fixed to the partition wall behind the excavation of the partition wall by the shield machine,
the rotating body is rotatable in a state in which the rotating inner column is accommodated in the fixed-side internal accommodation space, the rotating outer wall is accommodated in the fixed-side accommodation space, and the fixed inner wall is accommodated in the rotating-side accommodation space;
The side surface of the rotating outer wall is provided with one or more rotating outer circumferential grooves, and an injection pipe for the rotating outer wall is provided inside the rotating outer wall and opens into the rotating outer circumferential grooves,
a fixed outer wall injection pipe that opens at a position facing the rotation outer circumferential groove is provided inside the fixed outer wall;
The rotating outer circumferential groove is an endless band-shaped groove that runs around the side surface,
The material is injected into the rotating outer peripheral groove through the fixed outer wall injection pipe, and is then discharged to the face side through the rotating outer wall injection pipe.
A material supplying device characterized by: The side surface of the rotating inner column is provided with one or more rotating inner circumferential grooves, and an injection pipe for the rotating inner column is provided inside the rotating inner column and opens into the rotating inner circumferential grooves,
a fixed inner wall injection pipe that opens at a position facing the rotating inner circumferential groove is provided inside the fixed inner wall,
The inner circumferential rotating groove is an endless band-shaped groove that runs around the side surface,
The material is injected into the rotating inner circumferential groove through the fixed inner wall injection pipe, and then discharged to the face side through the rotating inner column injection pipe.
2. The material supplying device according to claim 1. A device for supplying materials including additives to the face side of a shield machine during tunneling,
A rotor that rotates together with a rotation shaft that rotates a cutter face plate of the shield machine ;
A fixed body independent of the rotating shaft,
The rotating body has a columnar rotating inner pillar fixed to the rotating shaft , a cylindrical rotating outer wall arranged on the outer periphery of the rotating inner pillar, and a rotating bottom plate arranged on the front side of the excavation, the rotating inner pillar and the rotating outer wall are attached to the rotating bottom plate, and a rotating side storage space is formed between the rotating inner pillar and the rotating outer wall,
The fixed body has a cylindrical fixed inner wall, a cylindrical fixed outer wall arranged on the outer periphery of the fixed inner wall, and a fixed bottom plate arranged on the rear side of the excavation, the fixed inner wall and the fixed outer wall are attached to the fixed bottom plate, a fixed side internal storage space is formed inside the fixed inner wall, and a fixed side storage space is formed between the fixed inner wall and the fixed outer wall,
The fixed body is fixed to the partition wall behind the excavation of the partition wall by the shield machine,
the rotating body is rotatable in a state in which the rotating inner column is accommodated in the fixed-side internal accommodation space, the rotating outer wall is accommodated in the fixed-side accommodation space, and the fixed inner wall is accommodated in the rotating-side accommodation space;
One or more fixed outer peripheral grooves are provided on a side surface of the fixed outer wall, and a fixed outer wall injection pipe is provided inside the fixed outer wall and opens into the fixed outer peripheral groove ;
a rotating outer wall injection pipe that opens at a position facing the fixed outer peripheral groove is provided inside the rotating outer wall;
The fixed outer peripheral groove is an endless band-shaped groove that runs around the side surface,
The material is injected into the fixed outer peripheral groove through the fixed outer wall injection pipe, and then discharged to the face side through the rotating outer wall injection pipe.
A material supplying device characterized by: one or more fixed inner circumferential grooves are provided on a side surface of the fixed inner wall, and a fixed inner wall injection pipe is provided inside the fixed inner wall and opens into the fixed inner circumferential groove ;
A rotating inner column injection pipe is provided inside the rotating inner column and opens at a position opposite to the fixed inner circumferential groove ,
The fixed inner circumferential groove is an endless band-shaped groove that runs around the side surface,
The material is injected into the fixed inner peripheral groove through the fixed inner wall injection pipe, and then discharged to the face side through the rotating inner column injection pipe.
4. The material supplying device according to claim 3 . The rotor is disposed so as to penetrate the partition wall.
5. The material supplying device according to claim 1, wherein the material supplying device is a material supplying device. The rotating body has two or more of the rotating outer walls, and the rotating side accommodation space is formed between the rotating outer walls,
The fixed body has two or more fixed outer walls, and the fixed-side accommodation space is formed between the fixed outer walls,
The rotating body is rotatable in a state in which two or more of the rotating outer walls are accommodated in the fixed-side accommodation space, and the fixed outer walls other than the outermost fixed outer wall are accommodated in the rotating-side accommodation space.
6. The material supplying device according to claim 1, a tip injection tube disposed within the cutter face plate and/or the cutter spokes;
The tip injection pipe is connected to the discharge side opening of the rotating outer wall injection pipe,
The material is discharged through the rotating outer wall injection pipe to the tip injection pipe and further supplied to the face side of the shield machine during excavation.
7. The material supplying device according to claim 1, wherein the material supplying device is a material supplying device. The tip injection tube opens at the tip of the cutter bit.
8. The material supplying device according to claim 7 .

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