JPH0618496U - Backfill injection device in shield machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To efficiently remove the backing material adhering to the backing supply pipe of the backing injection device. [Structure] A ribbon screw is arranged in the back-filling supply pipe and the cleaning pipe, and when cleaning the inside of the pipe, when supplying cleaning water from the tip of the cleaning pipe to the tip of the supply pipe,
The purpose is to rotate the ribbon screw and remove the backing material adhering to the inside of the tube.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a backfill injection device in a shield excavator.

[0002]

[Prior art]

 In the shield method, after assembling the segments inside the shield machine, the voids are filled with backing material to eliminate the voids between the outer periphery of the segment and the ground. As a method of filling the backing material, in addition to the method of filling it using the injection port provided in the segment, a method of filling it from the filling nozzle arranged inside the skin plate of the shield machine is proposed. There is.

[0003]

[Problems to be solved by the device]

 The backfill material filling technique using the above-mentioned filling nozzle has the following problems. <B> If a long time elapses between the filling of the backing material and the start of the next filling, the backing material left in the filling nozzle solidifies and causes a blockage accident. <B> A method of cleaning the inside of the filling nozzle when the filling operation is completed is conceivable. However, due to the operator's mistakes such as incomplete cleaning or missed cleaning timing, there is concern about the cleaning effect. . <C> Even if the nozzle is regularly cleaned, it is unavoidable that the backing material adheres to the inner peripheral surface of the nozzle, and as a result, the nozzle must be replaced frequently.

[0004]

[Purpose of the present invention]

 The present invention has been made in view of the above points, and its purpose is to provide a shield excavator capable of preventing a blockage accident due to adhesion of a backfill material and facilitating maintenance and management of the device. It is to provide a backfill injection device.

[0005]

[Means for Solving the Problems] In the present invention, an opening is formed in a part of a skin plate, and an injection pipe for backing material injection and a cleaning pipe are provided inside a cover that covers the opening from the outside. However, in a shield machine equipped with a port switching block that has a built-in valve mechanism that penetrates the tip of the cleaning pipe and the tip of the injection pipe and connects and disconnects both pipes by rotating the injection pipe, A backfill injection device in a shield machine, characterized in that a ribbon screw having a spiral shape is rotatably housed therein. However, the present invention opens an opening in a part of the skin plate, and arranges an injection pipe for backfill material injection and a cleaning pipe inside the cover that covers this opening from the outside, and the tip of the cleaning pipe, In a shield machine with a port switching block that has a built-in valve mechanism that penetrates the tip of the injection pipe and connects and disconnects the two pipes by rotating the injection pipe, a ribbon that has a spiral shape in both pipes. This is a back-filling injection device in a shield machine, in which a screw is rotatably housed.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. <A> Back-filling injection device FIG. 1 shows a cross-sectional view of the back-filling injection device 1 provided in the tail portion of the shield machine, and FIG. 2 shows a plan view thereof. The back-filling injection device 1 provided with openings at a plurality of positions on the skin plate 11 of the shield machine and arranged inside the cover 14 that covers the outside of each of these openings has a back-filling device 1 in the space between the segment 13 and the ground. This is a device for injecting the filler material, and comprises an injection pipe 2 and a cleaning pipe 3 which are arranged parallel to the axis of the shield machine. A nozzle 22 for discharging backfill material is detachably connected to the tip of the injection pipe 2, and an auxiliary pipe 31 is detachably connected to the tip of the cleaning pipe 3. In this embodiment, the nozzle 22 and the auxiliary pipe 31 are described as separate members separated from the pipes 2 and 3, but the nozzle 22 and the auxiliary pipe 31 are conceptually included in the pipes 2 and 3. Both the nozzle 21 and the auxiliary pipe 31 are held by penetrating the port switching block 4, and one of the nozzles 21 is held in a state of allowing rotation. As shown in FIG. 2, the port switching block 4 has a perforation 41 formed therein in the extension direction of the auxiliary pipe 31, and a communication path 42 that can communicate from the perforation 41 to the discharge port 22 of the nozzle 21. A part of the block 4 is cut out so that the backing material can be discharged between the segment and the ground, and the tip of the nozzle 21 is exposed in this cutout. The communication path 42 and the peripheral surface of the nozzle 21 form a valve mechanism.

<B> Injection Pipe A branch pipe 25 with a valve 23 is connected to and connected to the rear portion of the injection pipe 2, and a backing material supply hose (not shown) can be attached to and detached from the valve 23 at the end of the branch pipe 25. It is like this. A rotating cylinder 25 is installed between the peripheral surface of the injection pipe 2 and the shield machine, and the expansion and contraction of the cylinder 22 allows the injection pipe 2 to rotate within a certain range. When setting the rotation range of the injection pipe 2, the peripheral surface of the nozzle 2 closes the communication path 42 of the port switching block 4 when the backfill material is injected, and the discharge port 22 of the nozzle 2 changes the port 22 when cleaning the nozzle 2. It is important to set so as to coincide with the communication path 42 of.

<C> Cleaning Pipe A branch pipe 33 having a valve 32 is connected to the rear portion of the cleaning pipe 3 so that a water supply hose (not shown) can be attached to and detached from the valve 32 at the end of the branch pipe 33. There is.

<D> Ribbon Screw The ribbon screws 51 and 52 are scraping tools for scraping off and removing the backing material adhering to the inner peripheral surfaces of the pipes 2 and 3 and the nozzle 21. A plurality of spirally bent spiral bodies are connected by a connecting tool to form a predetermined length, and the spiral body is rotatably housed in the injection pipe 2 and the cleaning pipe 3. The ribbon screws 51 and 52 are connected to the respective rotation motors 53 and 54 arranged at the base ends of the pipes 2 and 3, and at least the ribbon screw 51 housed in the injection pipe 2 is constantly rotating. Further, the ribbon screws 51 and 52 are configured so that their rotation speeds can be adjusted so that they rotate at high speed during cleaning and rotate at low speed during injection and at other times. Reference numeral 12 in FIGS. 1 and 2 is an inspection window provided in a part of the skin plate 11 so that maintenance and inspection of the injection pipe 2 and the cleaning pipe 3 can be performed through the inspection window 12. Reference numeral 14 is a tail seal provided on the rear portion of the tail plate 11, and 24 is a support fitting 24 for supporting the middle of both pipes 2 and 3.

Next, the operation of the backfill injection device will be described. <B> Injecting backing material After assembling the ring-shaped segment 13 inside the seal tail 11 of the shield machine, simultaneously extend the shield jacks equipped with the shield machine to advance the shield machine. . Next, after connecting the backing material supply hose to the branch pipe 25 extending from the injection pipe 2, the valve 23 is opened, the backing material is pressure-fed, and the void portion formed between the discharge port 22 of the nozzle 21 and the segment 13 and the ground. To fill. During the filling operation of the backfill material, the ribbon screw 51 in the injection pipe 2 is rotating to prevent the backfill material from adhering to the inner peripheral surfaces of the injection pipe 2 and the nozzle 21.

<B> Cleaning When the injection work of the backing material is completed, the valve 23 is closed and the backing material supply hose is removed. Next, as shown in FIGS. 2 and 3, the rotating cylinder 25 is contracted to rotate the injection pipe 2 to a position where the communication port 42 of the port switching block 4 communicates with the discharge port 22 of the nozzle. In FIG. 3, the branch pipe 25 when the rotation of the injection pipe 2 is finished is shown by a chain line. Then, after connecting a water supply hose (not shown) to the branch pipe 33 extending from the cleaning pipe 3, the valve 32 is opened. At the same time, the ribbon screws 51 and 52 in both pipes 2 and 3 are rotated. When the water supply of the cleaning water is started in this state, the cleaning water flows from the cleaning pipe 3 into the port switching block 4 through the auxiliary pipe 31 as shown by the arrow in FIG. Further, the wash water that has flowed into the port switching block 4 flows into the nozzle 21 and the injection pipe 2 from the communication path 22 through the discharge port 22, and is finally discharged to the outside through the branch pipe 25 of the injection pipe 2. As a result, the backing material left or adhered in the nozzle 21 and the injection pipe 2 is cleanly removed by cleaning with cleaning water and scraping with the ribbon screw 51. Similarly, the cleaning pipe 3 side can cleanly remove the backfill material that has flowed back by cleaning and scraping with the ribbon screw 52. Further, the ribbon screws 51, 52 themselves can be cleaned by rotating the ribbon screws 51, 52 at a high speed for a certain time while feeding water.

<C> Maintenance / Inspection When the backing material adheres to the ribbon screw 51 in the injection pipe 2, the inspection window 12 of FIG. 1 is opened, the injection pipe 2 is separated from the nozzle 21, and the injection is performed. Slide the pipe 2 to the face side to expose the ribbon screw 51, and pull out the divided parts of the ribbon screw 51 in sequence while disassembling the exposed connecting portion of the ribbon screw 51 for cleaning. When the ribbon screw 51 is to be housed in the injection pipe 2, the above procedure is reversed. In this case, it is necessary to disconnect the ribbon screw 51 from the rotary motor 53 in advance. The inspection window 12 is also used when replacing the nozzle 21.

[0013]

[Effect of device]

 As described above, the present invention can obtain the following special effects.

<a> Since the adhesion of the backing material, which is difficult to remove only by cleaning, can be forcibly scraped off by the rigid ribbon screw housed in the injection pipe and the cleaning pipe, the backing material is blocked. Can be prevented.

<B> It is possible to easily replace the nozzle and clean the ribbon screw housed in each pipe through the inspection window.

[Brief description of drawings]

FIG. 1 Overall view of backfill injection device

[Figure 2] Plan view

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an explanatory diagram during cleaning

Claims (3)

[Scope of utility model registration request] 1. An opening is formed in a part of the skin plate,
An injection pipe for backfill material injection and a cleaning pipe are provided inside the cover that covers this opening from the outside, and the tip of the cleaning pipe and the tip of the injection pipe are penetrated, and the rotation operation of the injection pipe causes a gap between both pipes. In a shield machine with a port switching block that has a built-in valve mechanism that connects and disconnects the valve, a spiral ribbon screw is rotatably accommodated in the injection pipe, and the backfilling machine is used in a shield machine. apparatus. 2. An opening is formed in a part of the skin plate,
An injection pipe for backfill material injection and a cleaning pipe are provided inside the cover that covers this opening from the outside, and the tip of the cleaning pipe and the tip of the injection pipe are penetrated, and the rotation operation of the injection pipe causes a gap between both pipes. A shield machine having a port switching block having a built-in valve mechanism for communicating and shutting off the valve, wherein a spiral ribbon screw is rotatably housed in both pipes. Injection device. 3. An opening is formed in a part of the skin plate,
An injection pipe for backfill material injection and a cleaning pipe are provided inside the cover that covers this opening from the outside, and the tip of the cleaning pipe and the tip of the injection pipe are penetrated, and the rotation operation of the injection pipe causes a gap between both pipes. In a shield machine equipped with a port switching block that has a built-in valve mechanism that connects and disconnects, the spiral ribbon screw is rotatably accommodated in the pipe, and a window for inspection is provided in a part of the skin plate. The backfill injection device in the shield machine.