JP2004132087A - Shield machine for underground connection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield machine for underground connection capable of enlarging wrapping allowance with a receiving hood as much as possible when the machine is inserted in the receiving hood arranged underground. <P>SOLUTION: The shield machine 1 for underground connection is put in the receiving hood 8 arranged underground for connection. In this connection system is provided with a cylindrical body 7 provided in the cutter head 2 cutting the heading and inserted in the receiving hood 8 at the connecting time, a fixed hood 9 provided in shield machine body 11 at the rear side of the cutter head 2 with a specified gap W from the cylindrical body 7, and a movable hood 13 slidably provided in the axial direction at the inner peripheral face of the fixed hood 9 to cover the gap from the cylindrical body 7 in advancing motion. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an underground joining shield machine capable of increasing a wrap margin with a receiving hood disposed underground.
[0002]
[Prior art]
The present inventors have developed an underground joining shield machine shown in FIG. 7 that is fitted and joined in a receiving hood arranged underground.
[0003]
As shown in the figure, in this system, a shield excavator b on the insertion side is digged in opposition to a shield excavator a on the receiving side, and the cutter head c of the receiving side excavator a is shrunk by the copy cutter d to reduce the shielding. The solidifying agent (concrete or the like) is filled in front of the frame e while being retracted, and the insertion side excavator b is dug into the shield frame e to insert the cutter head f and the hood g. A solidifying agent is injected into the space between the tunnels (e) and (e.g., lap margin L) to stop the water, thereby allowing both tunnels to communicate with each other.
[0004]
In this system, the shield frame e of the receiving excavator a serves as the receiving hood, and the inserting excavator b corresponds to the underground joining shield excavator.
[0005]
Note that there is a related prior art described in Patent Document 1.
[0006]
[Patent Document 1]
JP-A-2002-155696 (pages 3 to 5, FIGS. 1 to 8)
[0007]
[Problems to be solved by the invention]
By the way, in order to increase the waterproofness of the wrap portion between the hood g and the shield frame e, it is important to increase the wrap margin L. However, when the retreat amount of the cutter head c cannot be increased due to the structure of the receiving side excavator a, the insertion depth of the insertion side excavator b becomes shallow, and the lap allowance L required for stopping water cannot be secured. Occurs. For this reason, water stoppage may become unstable.
[0008]
In particular, in an excavator of a type that excavates an excavable wall provided in a starting or reaching shaft or the like, in order to cut carbon fibers (reinforcing material) in the excavable wall, a cutter h is provided with a normal bit h. When the excavators are opposed to each other as shown in FIG. 7 to attach a dedicated bit for cutting carbon fiber having a high height, the excavators a and b are separated from each other by a dedicated bit, and The lap margin L becomes small.
[0009]
SUMMARY OF THE INVENTION An object of the present invention, which has been made in view of the above circumstances, is to provide a shield for underground bonding that can increase a wrap margin with a receiving hood as much as possible when fitted into a receiving hood disposed underground. To provide an excavator.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is an underground joining shield excavator that is fitted and joined in a receiving hood arranged in the ground, provided on a cutter head for cutting a face, and A cylinder inserted into the receiving hood, a fixed hood provided on the excavator body behind the cutter head with a predetermined gap from the cylinder, and slidably axially on an inner peripheral surface of the fixed hood. And a movable hood provided to close a gap with the cylindrical body during forward movement.
[0011]
ADVANTAGE OF THE INVENTION According to the shield excavator for underground joining which concerns on this invention, after inserting the cylindrical body of a cutter head and a part (front part) of the fixed hood of an excavator main body into a receiving hood, the movable hood is advanced and the cylinder is advanced. By closing the gap between the body and the fixed hood, not only the fixed hood but also the cylinder and the movable hood function as a wrap member. Therefore, the wrap margin becomes larger than before, and the stability of the water stoppage is improved.
[0012]
Preferably, the movable hood is provided with a first solidifying agent injection passage having an outlet which is covered by the inner peripheral surface of the fixed hood when retracted and is exposed to the gap when moving forward. With this configuration, the solidifying agent is supplied from the outlet of the first solidifying agent injection passage to the gap between the cylinder and the fixed hood, that is, substantially the wrap portion between the wrap member (fixed hood, movable hood, cylinder) and the receiving hood. Since it can be injected into the center, the water stoppage is increased. Further, since the outlet is usually covered with the inner peripheral surface of the fixed hood, the outlet is not clogged with earth and sand.
[0013]
It is preferable that a second solidifying agent injection passage having an outlet in the cylindrical body is formed in the cutter head, and a third solidifying agent injection passage having an outlet in the fixed hood is formed in the excavator body. With this configuration, the solidifying agent can be injected into the front portion and the rear portion of the wrap portion from the outlet of the second solidifying agent injection passage and the outlet of the third solidifying agent injection passage, respectively. Is done. Therefore, the water stop wall can be easily formed in the wrap portion.
[0014]
Further, it is preferable that the cutter head is provided with an oblique copy cutter that protrudes and retracts diagonally forward avoiding the cylindrical body. In this case, there is no need to provide an indentation hole, a notch, or the like for allowing the copy cutter to protrude and retract in the cylindrical body, so that the entire length of the cylindrical body can be used as the wrap member. Therefore, the wrap margin can be made as large as possible, and the water stoppage is enhanced.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the accompanying drawings.
[0016]
FIG. 1 is a front view of a shield excavator for underground joining according to the present embodiment, FIG. 2 is a side sectional view of the shield excavator for underground joining, and FIG. 3 is a partially enlarged view of FIG. FIG. 5 is an explanatory view showing a state in which the underground shield excavator is fitted into a receiving hood arranged underground.
[0017]
As shown in FIGS. 1 and 2, the underground shield excavator 1 has a cutter head 2 for cutting a face. Although the cutter head 2 has four cut-spokes 3 in the illustrated example, the number of spokes may be any number, and it is not limited to the spoke type and may be a face plate type.
[0018]
A normal cutter bit 4 for cutting a face and a dedicated bit 5 are mounted on the cutter head 2. The dedicated bit 5 is for cutting carbon fiber (reinforcing material) in an excavable wall provided in a starting or reaching shaft or the like as described above, and is set higher than a normal bit 4. I have.
[0019]
A cylindrical body 7 is attached to the outer peripheral portion of the cutter head 2 coaxially with the rotating shaft 6. As shown in FIG. 3B, the cylindrical body 7 is inserted into the receiving hood 8 at the time of joining, and the outer diameter thereof is formed to be smaller than the inner diameter of the receiving hood 8 to some extent. The length in the direction is formed so as to separate a predetermined gap W from a fixed hood 9 described later.
[0020]
As shown in FIGS. 1 and 2, the cutter head 2 is provided with an inclined copy cutter 10 that protrudes obliquely forward and avoids the cylinder 7. Therefore, the cylindrical body 7 is not provided with any indentation holes, notches, and the like for allowing the inclined copy cutter 10 to appear and disappear. The inclined copy cutter 10 is for excavating the inside of a curve when excavating the curve.
[0021]
As shown in FIGS. 2 and 3, a fixed hood 9 is provided on the excavator main body 11 behind the cutter head 2 at a predetermined gap W from the cylindrical body 7. The fixed hood 9 is attached to a front portion of a cylindrical shield frame 12 which forms an outer shell of the excavator body 11, and its inner and outer peripheral surfaces are flush with the inner and outer peripheral surfaces of the cylinder 7 of the cutter head 2. I have.
[0022]
The reason why the predetermined gap W is set between the front end of the fixed hood 9 and the rear end of the cylindrical body 7 is not only to rotate the cutter head 2 with respect to the excavator body 11 but also to leave this gap W This is because if it is narrow, the rear end of the cylindrical body 7 and the front end of the fixed hood 9 are worn by earth and sand passing therethrough during excavation, so that it is necessary to provide a certain gap (about 50 mm).
[0023]
As shown in FIG. 3, a movable hood 13 is provided on the inner peripheral surface of the fixed hood 9 so as to be slidable in the axial direction. When the movable hood 13 is retracted, as shown in FIG. 3A, it is completely accommodated inside the fixed hood 9 to secure the gap W. When the movable hood 13 is advanced, as shown in FIG. 2 and closes the gap W.
[0024]
The movable hood 13 is slid in the axial direction by an actuator 16 (jack) provided on a partition 15 that divides the inside of the excavator body 11 into a face side and an inside of a pit. A plurality of jacks 16 are arranged at predetermined intervals in the circumferential direction of the movable hood 13, and are connected to the movable hood 13 via pins 17.
[0025]
The movable hood 13 has an outlet 18 which is covered with the inner peripheral surface of the fixed hood 9 at the time of retreat as shown in FIG. 3A and is exposed to the gap W at the time of forward movement as shown in FIG. 3B. A solidifying agent injection passage 19 is formed. A plurality of outlets 18 (for example, 14 locations) are provided on the outer peripheral surface of the movable hood 13 at intervals in the circumferential direction.
[0026]
The solidifying agent (concrete or the like) is introduced into the first solidifying agent injection passage 19 from an injection pipe 21 attached through the partition wall 15 through a flexible hose 20 (a rubber hose or the like). ing. The reason for using the flexible hose 20 is that the hose 20 itself expands and contracts when the movable hood 13 slides as shown in FIGS.
[0027]
The flexible hose 20 and the injection pipe 21 may be provided for each of the first solidifying agent injection passages 19, or some or all of the first solidifying agent injection passages 19 may be collectively provided. Good. The flexible hose 20 and the rod portion of the jack 16 are covered by a conical surface-shaped cover 22 attached to the partition wall 15 and protected from earth and sand.
[0028]
As shown in FIG. 6, a second solidifying agent injection passage 24 having an outlet 23 in the cylinder 7 is formed in the cutter head 2. As shown in FIG. 1, the second solidifying agent injection passage 24 is formed in the cut-spoke 3 to which the inclined copy cutter 10 is not attached. However, the passage 24 may also be formed in a member 25 connecting the spoke 3 on which the copy cutter 10 is mounted and the cylinder 7.
[0029]
Further, as shown in FIG. 6, a third solidifying agent injection passage 27 having an outlet 26 in the fixed hood 9 is formed in the excavator main body 11. The third solidifying agent injection passage 27 is composed of a pipe penetrating the partition wall 15 and the fixed hood 9, and is provided in a plurality (for example, 14 places) at intervals in the circumferential direction of the fixed hood 9.
[0030]
As shown in FIG. 6, an auxiliary solidifying agent injection passage 29 having an outlet 28 in the shield frame 12 is formed in the excavator main body 11. The auxiliary solidifying agent injection passage 29 is formed of a pipe penetrating the shield frame 12, and is provided in a plurality (for example, 16 places) at intervals in a circumferential direction of the shield frame 12.
[0031]
The underground shield excavator 1 having the above-described configuration is arranged in the receiving hood 8 arranged underground as shown in FIGS. 4 (a) and 4 (b) and FIGS. 5 (c) and 5 (d). And joined. Hereinafter, the joining process will be described using the shield excavator 1 for underground joining as an insertion-side shield excavator and the receiving hood 8 as a shield frame of the receiving-side excavator 30.
[0032]
First, as shown in FIG. 4A, the cutter head 31 of the shield excavator 30 on the receiving side is retracted into the shield frame 8 by shrinking the copy cutter 32, and a solidifying agent 33 (concrete or the like) is provided in front thereof. Fill and harden the soil inside. Then, the shield excavator 1 on the insertion side is excavated so as to face the receiving excavator 30.
[0033]
At this time, as shown in FIG. 3A, the movable hood 13 of the insertion side excavator 1 is drawn into the inside of the fixed hood 9 by the jack 16, and the fixed hood 9 of the excavator body 11 and the cutter head 2 A predetermined gap W is formed between the cylindrical body 7 and the cylindrical body 7 to such an extent that abrasion due to the flow of earth and sand does not occur. As a result, sediment flow wear that may occur at the rear end of the cylindrical body 7 and the front end of the fixed hood 9 is suppressed.
[0034]
Then, when the insertion side excavator 1 approaches a predetermined distance, the inclined copy cutter 10 is extended to loosen the side ground, and at the same time, the solidifying agent 34 is injected radially outward from the second solidifying agent injection passage 24. Excavate while solidifying the loosened ground. Further, the solidifying agent 35 is sprayed forward from the cutter head 2 to solidify earth and sand taken into the cutter chamber 36.
[0035]
Then, as shown in FIG. 4B, when the insertion side excavator 1 approaches the ground improvement area 33 of the receiving side excavator 30, the inclined copy cutter 10 is contracted. Then, as shown in FIG. 5C, the insertion side excavator 1 is advanced, and fitted into the shield frame 8 of the receiving side excavator 30. At this time, the injection of the solidifying agent 34 from the second solidifying agent injection passage 24 is continued.
[0036]
This is because when the cutter head 2 of the insertion side excavator 1 enters the shield frame 8 of the receiving side excavator 30, the ground improvement soil 33 (solidified soil) between the cutter head 2 and the shield frame 30 is formed. This is because the cutter head 2 is loosened by the rotation, and thus needs to be solidified again.
[0037]
Then, as shown in FIG. 5D, the insertion side excavator 1 is further advanced, and the cutter heads 2 and 31 of both excavators 1 and 30 are on the verge of contact. Then, as shown in FIG. 3B, the movable hood 13 is advanced by the jack 16, and the tip of the movable hood 13 contacts the stopper 14 of the cutter head 2, thereby closing the gap W between the fixed hood 9 and the cylinder 7.
[0038]
Thereby, not only the fixed hood 9 but also the cylindrical body 7 and the movable hood 13 function as a wrap member of the water stop zone. Therefore, the lap allowance L2 is larger than the lap allowance L1 of the conventional type (the type without the movable hood 13 and the cylindrical body 7: see FIG. 7), and the stability of water stoppage is improved. That is, in the present embodiment, the amount of the insertion depth of the excavator 1 into the receiving hood 8 excluding the height of the bits 4 and 5 is a substantial wrap margin L2.
[0039]
Then, as shown in FIG. 6, the solidifying agent is supplied to the first, second, and third solidifying agent injection passages 19, 24, 27, respectively, and the cylindrical body 7, the movable hood 13, and the fixed hood of the insertion side excavator 1 are supplied. A solidifying agent is injected into a wrap portion between the shield frame 8 and the receiving side excavator 30. As a result, the solidifying agent is substantially uniformly injected into the wrap portion, and the water is quickly and appropriately stopped.
[0040]
That is, although the earth and sand in the wrap portion is solidified 33 at the stage of FIG. 4A, it loosens when the insertion side excavator 1 is fitted, so that it is removed from the first, second and third solidifying agent injection passages 19. , 24, 27 are again solidified. Further, by injecting the solidifying agent from each of the passages 19, 24, and 27, the injection zones are evenly distributed, and water stoppage is ensured.
[0041]
Here, the outlet 18 of the first solidifying agent injection passage 19 provided in the movable hood 13 is covered with the inner peripheral surface of the fixed hood 9 at normal times (at the time of retreat) as shown in FIG. Therefore, the soil and the like are not clogged, and as shown in FIG. 3 (b), the solidifying agent faces the gap W at the time of advancing, so that the solidifying agent can be injected exactly into the approximate center of the wrap portion.
[0042]
In addition, since the copy cutter 10 is an inclined copy cutter that projects obliquely forward and away from the cylinder 7, it is not necessary to provide a projection hole or a notch or the like for allowing the copy cutter 10 to appear and retract in the cylinder 7. 7 can be used as the wrap member. Therefore, the wrap margin can be made as large as possible, and the water stoppage is enhanced.
[0043]
Thereafter, as shown in FIG. 6, an injection pipe extends obliquely forward from the auxiliary solidifying agent injection passage 29 to the side ground and the solidifying agent 37 is injected. Thereby, the side ground at the tip portion (opening portion of the wrap portion) of the shield frame 8 of the receiving side excavator 30 is solidified, and is combined with the solidifying agent injected from each of the passages 19, 24, 27. Water stoppage is perfect.
[0044]
After the solidifying agent injected from each of the passages 19, 24, 27, and 29 is solidified, the partition walls 15, the cutter heads 2, 31, and the like of both the excavators 1, 30 are removed, and the tunnels are connected. As a result, the tunnels constructed by the two excavators 1 and 30 can be communicated quickly and reliably under complete water stoppage.
[0045]
In the present embodiment, a system in which the shield frame 8 of the receiving side excavator 30 is used as a receiving hood and the excavators 1 and 30 are mutually excavated to communicate with both tunnels has been described. The present invention is not limited to this, and may be applied to a type in which a tubular receiving hood is provided in an underground structure, and an underground joining excavator fits into the receiving hood.
[0046]
【The invention's effect】
As described above, according to the shield excavator for underground joining according to the present invention, when it is inserted into a receiving hood arranged underground, a wrap margin with the receiving hood can be made as large as possible. Therefore, the water stoppage can be improved.
[Brief description of the drawings]
FIG. 1 is a front view of a shield excavator for underground joining according to an embodiment of the present invention.
FIG. 2 is a side sectional view of the underground shield shield machine.
3 is a partially enlarged view of FIG. 2; FIG. 3 (a) shows a state in which a movable hood is pulled in to protrude an inclined copy cutter; FIG. 3 (b) shows a state in which the movable hood is pushed out and a tilted copy cutter is retracted; It is explanatory drawing which shows a state.
FIG. 4 is an explanatory view showing a step in which the underground shield excavating machine is fitted into a receiving hood, FIG. 4 (a) showing a first step, and FIG. 4 (b) showing a second step. is there.
5 is an explanatory view showing a step subsequent to that of FIG. 4. FIG. 5C is a view showing a third step, and FIG. 5D is a view showing a fourth step.
FIG. 6 is a partially enlarged view of FIG.
FIG. 7 is an explanatory view of a shield excavator for underground joining developed earlier by the present inventors.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 insertion side excavator as underground shield excavator 2 cutter head 7 cylinder 8 shield frame of receiving side excavator as receiving hood 9 fixed hood 10 inclined copy cutter 11 excavator body 13 movable hood 18 first solidification Outlet 19 of the agent injection passage 19 first solidifying agent injection passage 23 outlet of the second solidifying agent injection passage 24 second solidifying agent injection passage 26 outlet of the third solidifying agent injection passage 27 third solidifying agent injection passage W predetermined gap

Claims (4)

An underground joining shield excavator that is fitted and joined in a receiving hood arranged in the ground, and is provided on a cutter head that cuts a face and is inserted into the receiving hood at the time of joining, A fixed hood provided on the excavator body behind the cutter head at a predetermined gap from the cylindrical body, and a gap between the cylindrical body at the time of forward movement provided slidably in an axial direction on an inner peripheral surface of the fixed hood. A shield excavator for underground joining, comprising a movable hood for closing. 2. The underground shield excavator according to claim 1, wherein the movable hood is provided with a first solidifying agent injection passage having an outlet which is covered by an inner peripheral surface of the fixed hood when retreating and is exposed to the gap when moving forward. 3. The cutter head according to claim 1, wherein a second solidifying agent injection passage having an outlet in the cylinder is formed in the cutter head, and a third solidifying agent injection passage having an outlet in the fixed hood is formed in the excavator body. Underground shield excavator. 4. The underground shield excavator according to claim 1, wherein the cutter head is provided with an inclined copy cutter which obliquely protrudes and protrudes forward, avoiding the cylindrical body.

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