JPH0441760B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to tunnels that require protection or ground reinforcement of existing structures above ground, river bottoms, underground structures, buried pipes, etc. during tunnel excavation. If it gets hot,
This invention relates to a device that performs soil improvement work by injecting improvement material from inside a shield machine.

[Prior Art] Conventionally, as shown in FIG.
Drilling holes from inside the shield machine 1 which is digging by taking reaction force from When performing soil improvement work in any of the improvement target ranges 13 shown in FIGS. 13a to 13f by sequentially driving drill rods for injecting improving material in multiple directions 10, 11, and 12 using the machine 9, the drill rods shown in FIGS.
As shown in FIG. 15, a plurality of drill rod guide tubes 17-1 and 17- are provided in advance on the shield body 15 and the partition wall 16 fixed thereto.
2, Pass the injection drill rod 14 through 17-3,
Holes were drilled and improvement materials were injected.

[Problems to be Solved by the Invention] In the above-mentioned prior art, the shield jack 18, the ring gutter 19, the segment assembly erector 20 shown in FIG. 14, and the earth removal device 21 shown in FIG. The installed various equipment or instruments become obstacles, and the installation location of the drilling machine 9 is restricted. There may be cases where improvements cannot be made as expected, and equipment and instruments inside the aircraft must be removed. Also,
There are 17 drill rod guide pipes used for drilling and injection.
-1, 17-2, and 17-3, the installation location of the hole drilling machine 9 must also be moved. Therefore, a large amount of time is required for setup work for each location where the improving material is injected. Moreover, the improvement material injection direction is the drill rod guide pipe 17-1, 17-2, 17
-3 is determined by the installed direction,
Because the number of drill rod guide pipes cannot be increased too much due to the structure and strength constraints of the shield body and bulkhead, there is a problem in that the direction of injection of the improving material cannot be freely selected at the construction site.

The purpose of the present invention is to enable a wider range of improvement material injection directions to be selected without the equipment in the machine becoming an obstacle or being limited by the number of drill rod guide tubes, and to continuously maintain the improvement material injection direction. To provide a ground improvement device from inside a shield machine, which can be constructed efficiently in a short period of time.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a drill rod guide hole for passing an injection drill rod through the bulkhead, which is located in the front part of the shield body and can rotate together with the cutter head during soil improvement work. A support means for a drilling machine that sends an injection drill rod into the ground is provided on the inside of the machine on the bulkhead, and by rotating the bulkhead, improved material is drilled over a 360° range around the center of the shield in front of the face. It is now possible to select the injection direction.

[Function] During ground improvement work, the drill rod for injection passes through the drill rod guide hole of the bulkhead from the drilling machine supported on the bulkhead, and also between the spokes of the cutter head (or between the spokes and the faceplate if the drill rod has a face plate between the spokes). It is sent into the front ground through the slit formed by the When the bulkhead is rotated together with the cutter head, the drilling machine and drill rod guide hole on the bulkhead rotate and move around the center of the shield, so the improvement material can be injected over a 360° range around the center of the shield in front of the face. It becomes possible to select the direction, and the improving material injection direction can be changed continuously. In addition, by moving the installation position of the drilling machine on the bulkhead horizontally or vertically while the bulkhead is stopped, the drill rod can be fed into the ground from the drilling machine through the drill rod guide hole in the bulkhead. The direction of the drill rod for injection can be changed. Therefore, by combining the rotation of the partition wall and the movement of the hole drilling machine installation position, it becomes possible to select a wider range of improvement material injection directions in accordance with the improvement target range.

During soil improvement work, the bulkhead rotates together with the cutter head, so the injection drill rod will not hit the spokes or faceplate of the cutter head due to the rotation of the bulkhead, and there is no need to rotate the cutter head independently to adjust the position of the spokes or faceplate. .

[Example] Hereinafter, a first example of the present invention will be described with reference to FIGS. 1 to 6.

As shown in FIGS. 1 and 2, the stator side of the bearing 22 is attached to the shield body 15, and the rotor side of the bearing 22 is attached to the partition wall 23. In this example, the partition wall 23 is supported together with the cutter head 24 by a bearing 22, and always rotates together with the cutter head 24.

Figure 3 is a front view of the cutter head without a face plate.
A bit 26 is provided on the spoke 25 located on the face. FIG. 4 is a front view of a cutter head having a face plate. The face plate 27 is located between the spokes 25 provided with the bits 26 and is located on the face surface, and forms slits 28 between the spokes 25 into which the excavated soil flows. ing.

A chamber 2 for taking in excavated earth and sand is provided between the cutter head 24, the shield body 15, and the partition wall 23.
A seal 30 is provided between the shield body 15 and the partition wall 23 to prevent dirt and mud from entering the machine from the chamber 29. The partition wall 23 and the cutter head 24 are rotationally driven via a gear 32 by a cutter drive device 31 disposed on the shield body 15.

The hole drill 9 is mounted on a hole drill support stand 33 that protrudes into the machine from the partition wall 23 via a hole drill attachment 34 . The hole drilling machine 9 has an injection drill rod 14.
is held by the chuck 35, and the drill rod 14 is rotated by a hydraulic motor and a hydraulic jack while being fed into the ground to drill a hole. Injection drill rod 14
For example, the hole is made up of a double pipe with a bit at the tip, and the hole is added one meter at a time until the target point is reached, and after the hole is drilled, this is used as the injection pipe for the improved material. The hole drilling machine attachment 34 is attached to a support shaft 36
The hole drilling machine 9 is moved up and down by the turntable 37.
It is supported so as to be able to swing from side to side, and is used to freely change the direction of the injection drill rod 14 by horizontal and vertical movement of the drilling machine 9, which will be described later. The partition wall 23 is provided with a drill rod guide hole 38 through which the injection drill rod 14 passes from the inside of the machine to the face side. A drill rod guide hole 38 is provided at an eccentric position in the partition wall 23 so that the drill rod 14 can pass between the spokes 25 of the cutter head 24 or through the slit 28.

In order to guide the injection drill rod 14, a flexible receiver 39 is provided on the inside of the drill rod guide hole 38. As shown in FIG.
2. Built-in metal seals 40-4, 40-5 tightened by nuts 40-3, and flange 40-3.
The outer cylinder 40 is attached to the partition wall 23 side at 6, and the outer cylinder 40 fits inside the outer cylinder 40 with its outer spherical surface, and freely tilts to follow the direction of the injection drill rod 14 passing through the drill rod through hole 41-1. Metal seals 40-4 and 40-5 prevent dirt and mud from leaking into the machine from between the outer cylinder 40 and the inner cylinder 41. In addition, when drilling normally, the drill rod through hole 41-1 is closed by a method such as attaching a blind cover to the flange 41-2 of the inner cylinder 41.
blockade.

The ground improvement device of this embodiment has the above-described configuration, and when ground improvement work is required, the hole drill attachment 34 and the hole drill 9 are attached to the hole drill support stand 3.
3. Use it by installing it on top. At this time, the direction of injection of the improving material can be selected by rotating the partition wall 23 and the cutter head 24.
Rotation of the entire apparatus including the drilling machine, horizontal movement or vertical movement of the drilling machine 9 on the drilling machine support 33, and accompanying vertical or horizontal rocking of the drilling machine 9. be able to.

First, direction change by horizontal and vertical movement of the drilling machine 9 will be explained with reference to FIGS. 1 and 6. The installation position of the drilling machine 9 on the drilling machine support stand 33 is moved in the left-right direction as shown by the two-dot chain line in FIG. 9 to the left and right, the direction of the injection drill rod 14 passing through the drill rod guide hole 38 changes to a direction perpendicular to the paper plane of FIG.
As shown by the two-dot chain line in the figure and FIG. 6, the support stand 33 is
The installation position of the hole drill 9 above is moved in the vertical direction, and the hole drill 9 is moved by the support shaft 36 of the hole drill attachment 34.
When the drill rod guide hole 38 is swung up and down,
The direction of the injection drill rod 14 passing through the first
As shown in FIG. 14', the angle changes vertically along the plane of the paper, and the inclination angle with respect to the horizontal line changes from θ to −θ.
The movement of the drilling machine in the horizontal and vertical directions can also be carried out continuously using a drive device such as a hydraulic jack.

On the other hand, by rotating the bulkhead 23 together with the cutter head 24 while the drilling machine 9 is fixed on the drilling machine support stand 33, the direction of the injection drill rod 14 can be changed over a 360° range around the shield center Ο. Continuously changing. Therefore, by combining the movements of the above-mentioned parts, it is possible to freely select the improving material injection direction according to the range to be improved.

After selecting the improving material injection direction in this way,
Driving the hole drilling machine 9, the cutter head 2 shown in FIG.
The drill rod 14 for injection is sent into the ground in front of the ground through a slit 28 formed between the spokes 25 of the cutting head 24 or between the spokes 25 of the cutter head 24 and the face plate 27 shown in FIG. 4 to perform drilling and injection.

In the first embodiment described above, the partition wall 23 is always rotated together with the cutter head 24, but during normal excavation, there is no need for the partition wall 23 to rotate together with the cutter head 24, and the partition wall 23 is rotated at the center of the chamber 29. In order to prevent the excavated earth from stagnation, it is preferable to allow the partition wall 23 and the cutter head 24 to move relative to each other. The second, third, and fourth embodiments described below take this point into consideration.

In a second embodiment of the present invention shown in FIGS. 7 and 8, the bulkhead 23 supporting the drilling machine 9 is rotatably attached to the shield body 15 via a bulkhead holder 43 and a bearing 44. There is. The bearing 44 is attached to the bulkhead holder 43 on the stator side and to the bulkhead 23 on the rotor side,
The rotor side is connected to and released from the bulkhead holder 43 by a pin 45. On the other hand, the cutter head 24 is provided with a central shaft 46 that protrudes toward the inside of the machine. supported as possible. Reference numeral 50 denotes a rotation transmitting device attached to the inboard end of the central shaft 46 by a fixing device 51;
2, it is connected to and released from the partition wall 23. A seal 53 seals between the partition wall 23 and the cutter head 24. The rest of the structure is the same as that in FIG. 1, and the same parts are shown with the same reference numerals, and their explanation will be omitted.

During normal excavation, the bulkhead 23 is connected to the bulkhead holder 43 by the pin 45, and the cutter head central axis 4
The rotation transmitting device 50 on 6 and the partition wall 23 are connected by the pin 52
Remove and separate. In this way, during excavation due to the rotation of the cutter head 24, relative movement occurs between the bulkhead 23 and the cutter head 24 while the partition wall 23 is in a stopped state, so that excavated soil is deposited in the center of the chamber 29 formed between them. No stagnation occurs.
At the time of soil improvement construction, on the other hand, the partition wall 23 is connected to the rotation transmitting tool 50 by the pin 52, and the partition wall 23 is removed from the partition wall holder 43 by removing the pin 45.
3 can be rotated together with the cutter head 24 to continuously change the improving material injection direction as described above.

A third embodiment of the present invention shown in FIGS. 9 and 10 is an example in which an independently driven cutting and stirring device 56 is provided on the face side of the partition wall 23 that supports the hole drilling machine 9.

The cutting stirring device 56 includes cutting stirring blades 57 and a shaft 5.
8, bearings 59, 60, and a gear 61, and the middle part of the shaft 58 is the shaft support part 6 of the partition wall 23.
2, supported by a seal 63 and a seal presser 64, the end on the face side is supported by a cutter head center 65 via a seal 66 and a seal presser 67, and the cutting agitation blade 57 is disposed on the partition wall 23. It is rotationally driven via a gear 61 by a stirring blade drive device 68.

The bulkhead 23 has a bulkhead holder 43 and a bearing 44.
A gear 55 is rotatably attached to the shield body 15 via the gear 55 and fixed to the bulkhead 23.
transmits the rotational force of the partition wall driving device 54, which is arranged independently on the partition wall holder 43, to the partition wall 23.

In this embodiment, during normal excavation, the bulkhead drive device 5
The cutter head 24 is separately driven by the cutter drive device 31, and the cutting stirring blade 57 is separately driven by the stirring blade driving device 68. During ground improvement construction,
The cutting agitation device 56 is brought to a halt, and the bulkhead drive device 54 is started to rotate the bulkhead 23 at a speed matching the rotation of the cutter head 24. The rest of the structure is the same as in FIG. 1, and the same parts are designated by the same reference numerals.

According to this embodiment, during normal excavation, the bulkhead 23
Since it is in a stopped state and relative movement is occurring between the cutting and agitating blades 57, soil can be prevented from stagnation between the rear surface of the cutting and agitating blades 57 in the chamber 29 and the front surface of the partition wall 23, and The driven cutting stirring device 56 can promote stirring of the excavated earth and sand and the viscosity imparting material in the center of the chamber where the circumferential speed of the cutting head is low.

The fourth embodiment of the present invention shown in FIG. 11 also has an independently driven cutting and stirring device 56 on the face side of the partition wall 23 that supports the hole drilling machine 9, but the partition wall holder 43 is attached to the cutter head 24. This embodiment differs from the third embodiment in that the partition wall 23 is rotatably supported by the partition wall holder 43 and bearing 44.

In this embodiment, during normal excavation, the bulkhead holder 43
The partition wall 23 is rotated by a partition drive device 54 disposed above and a gear 55 fixed to the partition wall 23. At this time, the cutter head 24 and the cutting stirring blade 57 are also rotationally driven by the respective drive devices 31 and 68. During ground improvement work, the bulkhead drive device 54 is stopped, and the cutter drive device 3
1 causes the partition wall 23 to rotate together with the cutter head 24. At this time, the cutting stirring device 56 is in a stopped state.

According to this embodiment, relative movement can be generated between the partition wall 23 and the cutting stirring blade 57 by selecting the rotation speed and rotation direction of the partition wall 23 during normal excavation. Stagnation of excavated earth and sand between the rear surface of the cutting stirring blade 57 and the front surface of the partition wall 23 can be prevented.

[Effect of the invention] According to the present invention, the following effects can be obtained.

(1) By rotating the bulkhead, the direction of improving material injection can be selected over a 360° range around the center of the shield in front of the face, allowing ground improvement to be carried out to suit the various improvement target areas shown in Figure 13 a to f. Construction is now possible.

(2) Since the direction of injection of the improvement material can be changed continuously by rotating the partition wall, construction can be carried out without interruption and the construction period can be shortened.

(3) Since the hole-drilling machine can be installed on the bulkhead, it is possible to significantly shorten the setup time for injection of improving material, which was previously required for removing equipment inside the machine and relocating the hole-drilling machine.

(4) Since it is not necessary to provide a large number of drill rod guide tubes as in the conventional case, the structure of the shield body and partition wall can be simplified and the strength can be stabilized.

(5) To rotate the bulkhead together with the cutter head,
The spokes and face plate of the cutter head do not become obstacles to drilling and pouring, and there is no need to rotate the cutter head independently to adjust the position.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a first embodiment of the present invention, Fig. 2 is a side view taken from line A-A in Fig. 1 in the direction of the arrow, and Figs. 3 and 4 are a front view of the cutter head. 5 is a cross-sectional view of the universal support for guiding the injection drill rod in FIG. 1, FIG. 6 is an explanatory diagram of changing the position of the drilling machine on the support base, and FIG. FIG. 8 is a side view taken along line B-B in FIG. 7 in the direction of the arrow; FIG. 9 is a longitudinal sectional view showing the third embodiment of the present invention; 10 is a side view taken along the line CC in FIG. 9 in the direction of the arrow; FIG. 11 is a longitudinal cross-sectional view showing a fourth embodiment of the present invention;
Fig. 12 is an explanatory diagram of an example of ground improvement construction from inside a conventional shield machine, Fig. 13 is a diagram showing the types of improvement target ranges, and Figs. 14 and 15 are explanatory diagrams of obstacles inside the machine in the conventional example. . 9...Drilling machine, 14, 14'...Drill rod for injection, 15...Shield body, 23...Partition wall,
24... Cutter head, 31... Cutter drive device, 33... Drilling machine support, 34... Drilling machine attachment, 38... Drill rod guide hole, 45... Connection pin between bulkhead and shield body, 46... . . . Center shaft of cutter head, 52 . . . Connection pin between partition wall and cutter head, 54 . . . partition wall driving device, 55 .

Claims (1)

[Scope of Claims] 1. A drill rod guide for penetrating an injection drill rod through a bulkhead located at the front of a shield body and capable of rotating together with a cutter head during ground improvement work, in an apparatus for performing ground improvement work by injecting improvement material from within a shield machine. A hole is provided, and a support means for a drilling machine that sends an injection drill rod into the ground is provided on the inside of the machine on the bulkhead, and by rotation of the bulkhead, the hole is drilled over a 360° range around the center of the shield in front of the face. A ground improvement device from within a shield machine, characterized by being able to select the direction of injection of improvement material. 2. The drilling machine support means is composed of a drilling machine support stand protruding into the machine from the partition wall, and a drilling machine mounting fixture that allows the direction of the injection drill rod to be changed freely, and the drilling machine support means on the support stand A ground improvement device from inside a shield machine as set forth in claim 1, characterized in that the installation position is variable. 3. During normal excavation, the bulkhead is connected to the shield body and is in a stopped state, and during ground improvement work, the bulkhead is released from the shield body, and is connected to the central axis of the cutter head that protrudes toward the shield body, and rotates together with the cutter head. A ground improvement device from within a shield machine as set forth in claim 1 or 2, characterized in that the ground improvement device can be operated from within a shield machine. 4. The partition wall supports an independently driven cutting and stirring device that stirs the excavated soil on the face side, and during normal excavation, the partition wall is in a stopped state, and during ground improvement construction, the partition wall is placed between the shield body and A ground improvement device from within a shield machine as claimed in claim 1 or 2, characterized in that it can be rotated in accordance with the rotation of the cutter head by a driving means provided therein. 5 The partition wall supports an independently driven cutting agitation device that stirs the excavated earth and sand on the face side, and during normal excavation, the cutting head and the cutting agitation device are controlled by the drive means provided between the partition wall and the cutter head. From within the shield machine according to claim 1 or 2, the partition wall is rotated relative to the stirring blade, and the partition wall can be rotated together with the cutter head during soil improvement construction. ground improvement equipment.