JP2000314294A - Connection device for separation type shield excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection device to separably connect a plurality of separation type shield excavators in which a forward body having a cutter disk on its tip in a rotatable manner is connected to a rear body in a bendable manner while preventing underground water or earth from entering under the underground high pressure. SOLUTION: This connection device comprises spacers 12 having an arc surface to be joined with each rear body 3 which hold a portion between the near bodies 3, 3 of an adjacent separation type shield excavators, and a screw hole 21 which penetrates a skin plate of each rear body 3 and communicated with a screw hole 18 provided in the spacers 12. The connection device further comprises a through-hole 14 which penetrates the spacers 12 and the skin plate of the rear body 3 on both sides thereof, a coupling piece 15 which is passed through the through-hole to connect the rear body 3 of the adjacent separation type shield excavators 1, 1, a tightening piece 15 which is screwed through the screw hole from the inner side of the rear body 3 and screwed to the screw hole 18 of the spacers 12 for tightening, and an annular seal member 20 which is interposed between the spacers 12 and an outer surface of each near body 3 to surround the circumference of all screw holes 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of separated shield excavators in which a front body having a cutter disk rotatably provided at a front end thereof with respect to a rear body is flexibly connected to at least a space between adjacent rear bodies. , A connection device for detachably connecting.

[0002]

2. Description of the Related Art For example, a shield machine disclosed in Japanese Patent Publication No. 4-11718 has at least two rear bodies in which a front body provided with a cutter disk is swingably (oscillated) with respect to the rear body. While turning the shield excavator, turning the shield excavator and excavating the tunnel where the two circles overlap. , The direction of which can be changed. Conventionally, in this type of shield machine, there has been no idea of performing the excavation work by completely separating each machine, so that the machine is not separated. For this reason, if separation is to be performed, the ground around the excavator to be separated is improved by injecting chemicals, etc., and then the worker goes out of the machine and moves between the rear torso or rear torso of the shield excavator and the front torso. It is necessary to remove the spacer between them and to perform water stoppage treatment by covering the hole for the connecting tool remaining in the rear trunk or the front trunk, so that each excavator can be separated for the first time .

As a prior art, there is a connection device described in Japanese Utility Model Publication No. 7-54395. This device is a straight-body type 2
A penetrating hole provided in the rod of the connecting jack, with a connecting jack extendable and retractable from one of the shield excavators toward the other excavating machine and inserted into the inside, and a fixing jack built into the other excavating machine is provided on the rod of the connecting jack And the connection jack is contracted to integrate both shield machines.

[0004]

The conventional connecting device described in the above publication has problems to be solved in the following points. That is, the two shield excavators are integrally connected by the connecting jack using the union jig as a spacer, so that both can be kept at a fixed interval, but a seal mechanism is provided between the union jig and the excavator. Since they are not provided, even when they are integrally connected, there is a possibility that high-pressure water or earth and sand from the ground may enter the inside of the excavator during excavation work. For this reason, it is difficult to separate the excavator in the ground under high pressure.

When the two shield excavators are separated from each other, high-pressure water or earth and sand from the ground penetrates into the excavator from a hole for projecting or inserting the connecting jack. It is conceivable to attach a lid to each hole, but the structure is not such that the lid can be attached around the hole before the connection jack is pulled in.

[0006] Since each shield machine is a straight-body machine without a folding mechanism, the shield machine is connected to a shield machine in which a front body provided with a cutter disk is swingably connected to a rear body. It is impossible to apply it as it is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has disclosed an underground shield excavator in which a front body having a cutter disk rotatably provided at a tip thereof with respect to a rear body is flexibly connected. It is an object of the present invention to provide a connecting device for connecting separably while preventing intrusion of groundwater or earth and sand under high pressure.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, a connecting device for a separation type shield machine according to the present invention comprises a front body having a cutter disk rotatably provided at a tip with respect to a rear body. A plurality of separation type shield excavators connected to the separation type excavator, the rear separation unit keeps a predetermined distance between the rear trunks of the adjacent separation type shield excavators, A spacer having an arc surface that can be joined to, and penetrating the skin plate of each of the rear trunks,
A screw hole communicating with a screw hole provided in the spacer, a through hole passing through the spacer and a skin plate of a rear body on both sides of the spacer, and a through hole penetrated by the through hole, after the adjacent separated shield excavator. A coupling for connecting the body, a fastening tool that is screwed into the screw hole from the inside of the rear body, and is screwed into the screw hole of the spacer to fasten the outer surface of the spacer and the rear body; An annular sealing member interposed therebetween and surrounding the periphery of all the screw holes. Further, as described in claim 2, a hydraulic cylinder is used for the coupling tool, a hydraulic cylinder is disposed in the rear trunk of one of the shield excavators, and the front end of the cylinder rod is capable of projecting to both sides. The stop piece may be pivotally mounted, and the cylinder rod may be inserted into the other rear body through a series of through holes of the skin plate and the spacer. According to this configuration, the rear cylinders of the two shield excavators can be integrally connected by contracting the hydraulic cylinder in a state where the locking pieces are extended and locked to the inner wall of the skin plate.

According to the connecting device of the present invention having the above-described structure, when the excavator is separated, the coupling is first rotated and extracted. However, even in the extracted state, the annular sealing member functions, so that Intrusion of high-pressure water or the like from the hole into the shield machine is prevented. Attach the lid (water stop plate) on the flat part around the through hole from which the fastener was removed to close the through hole, and then rotate the fastener to remove the tip of the fastener from the screw hole in the spacer. Then, the screw is held in this state, that is, the fastener is screwed into the screw hole of the skin plate, and the screw hole of the skin plate is closed with the fastener. Then, by extracting all the fasteners from the bolt holes (screw holes) of the spacer, the spacer is separated from the rear trunk of the shield machine and the shield machine is separated. Can be performed. As described above, at the time of separation, the holes in the rear trunk required for connection are closed with lids (water blocking plates) or fasteners, and the intrusion of high-pressure water and earth and sand through the holes is reliably prevented. Become. As described above, the shield excavator can be separated by a simple operation procedure, so that the time required for the separation is greatly reduced, and the work such as ground improvement is not required at all, so that the cost is considerably reduced.

According to a third aspect of the present invention, the screw hole and the through hole are respectively closed around the screw hole and the through hole on the inner peripheral surface of each skin plate of the rear body when the shield machine is separated. It is desirable to provide a flat portion to which a water stop plate or a fastener for mounting is attached.

According to the connecting device of the third aspect, at the time of disconnection, the hole of the rear body required for connection is closed by an upper lid (water stopping plate) or a fastener mounted on a flat portion, and the hole is removed from the hole. The intrusion of high-pressure water and earth and sand is surely prevented.

[0012] In the connection device of the second aspect, the first aspect is also provided.
As in the connection device described above, the rear fuselage of the shield machine can be separated by a simple operation procedure.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a connecting device for a shield type shield machine according to the present invention.

FIG. 1A is a perspective view schematically showing a state where two shield excavators are connected, and FIG. 1B is a perspective view schematically showing a state where two shield excavators are separated. 2 is a longitudinal sectional view at the center of the shield machine shown in FIG. 1 in a connected state, and FIGS. 3 to 5 show connecting devices on the rear trunk side of the shield machine according to the embodiment of the present invention. 3 is an enlarged sectional view taken along line AA of FIG. 2, FIG. 3B is an enlarged sectional view showing another embodiment, FIG. 4 is a sectional view taken along line BB of FIG. 3, and FIG.
5 (b) is an enlarged sectional view of the shield machine in a separated state.

As shown in FIGS. 1A and 2, in this example, two separate shield excavators 1 are connected by a connecting device 11.
・ 1 is connected. Each shield machine 1 has a known structure, and a front body 2 is connected to a cylindrical rear body 3 so as to be able to bend (bend) freely, and a cutter disk 4 is rotatably supported at the tip of the front body 2. I have. The cutter disk 4 is rotated via a speed reduction mechanism by a plurality of drive motors 5 arranged at intervals in the circumferential direction. A plurality of shield jacks 6 are arranged rearwardly at intervals in the circumferential direction on each rear trunk 3, and extend by pressing the shield jacks 6 against a segment wall S assembled by an erector (not shown). To move forward. The angle of refraction of the front body 2 with respect to the rear body 3 is maintained at a predetermined angle by a plurality of not-shown center bending jacks interposed between the front body 2 and the rear body 3. You.

Each of the shield excavators 1 and 1 has a rear trunk 3
The three bodies 3 are integrally connected by the connecting device 11, but the front body 2 is connected to the rear body 3 by a second connecting device 41, which will be described later, such that the front body 2 can swing freely within a predetermined angle range. The second connection device 41 is desirably provided, but can be omitted because the center bend jack can maintain the front body 2 at a fixed interval.

The connection device 11 has the following configuration. That is, as shown in FIG.
3) A spacer 12 having a joint surface 12a curved in an arc shape on both sides according to the outer peripheral surface of the third skin plate 3a. In the spacer 12, as shown in FIG. 4, through holes 13 are formed in the thickness direction so as to penetrate the two coupling members 15 at front and rear intervals on the center line in the width direction. . Also, the spacer 1 of each skin plate 3a
2 at the position corresponding to the through hole 13
Are formed in the thickness direction. Then, on the inner peripheral surface of each skin plate 3a, around the through holes 14, a water stop plate (lid) 16 described later can be easily attached by welding or the like at the time of separation, and the through holes 14 can be securely closed. Is formed on the flat portion 3b. The coupling tool 15 is a bolt-shaped member having a head portion 15a at a base end, a screwing portion 15b is formed only at a distal end portion, and has a structure in which a nut 15c is screwed to the screwing portion 15b and tightened. . In addition, the coupling device 15 may use a hydraulic cylinder. In this case, as shown in FIG. The cylinder 61 is disposed and pivoted to the tip of the cylinder rod 61a to pivotally attach the locking pieces 62 projecting from the peripheral wall of the cylinder rod 61a to both sides, thereby connecting the cylinder rod 61a of the hydraulic cylinder 61 to the shield machine 1 The hydraulic cylinder 61 is contracted by inserting the locking piece 62 into the rear body 3 through the through holes 13 and 14 and locking the locking piece 62 to the flat portion 3b. The rear trunks 3 can be integrally connected.

In the vicinity of the peripheral edge of each joint surface 12a of the spacer 12, in this example, as shown in FIG. 4, a penetrable end of a fastening bolt (fastening tool) 17 can be screwed into each corner. A substantially rectangular annular groove 19 is formed so as to completely surround the bolt holes 18 including the two through holes 13. An annular seal member 20 is fitted so as to partially project outward. Furthermore, each skin plate 3a
In the position corresponding to the bolt hole 18 of the spacer 12, a bolt hole (screw hole) 21 which penetrates the skin plate 3 a in the thickness direction and is screwed to the bolt 17 is formed. Around the bolt holes 21 on the inner peripheral surface of each skin plate 3a, a head 17a of the tightening bolt 17 is provided.
Are formed on the flat portion 3c so as to be surely in contact therewith. The flat portion 3c can be formed by fixing a member 22 separate from the skin plate 3a to the skin plate 3a by welding or the like as shown in FIG. 5, so that the vicinity of the outlet of the bolt hole 18 can be formed. When the annular recess 23 is formed and the seal ring 24 is fitted therein, the processing becomes easy.

As described above, the connection device 11 of the present invention
Is constructed, but the connection device 11 of this example is separated by the following procedure.

(1) In FIG. 3A, after the nut 15c of the coupling 15 is removed by rotation, the coupling 15 is moved to the head 1
Remove to 5a side. In this state, since the annular seal member 20 is functioning, intrusion of high-pressure water or the like from the through holes 13 and 14 into the shield machine 1 is prevented.

(2) Water stop plate 16 (see FIG. 3A)
Is attached to the flat portion 3b around the through hole 14 from which the coupling 15 has been removed by welding to close the through hole 14.

(3) The tightening bolt 17 is rotated, and the rotation is stopped in a state where the tip end of the tightening bolt 17 is removed from the bolt hole 18 of the spacer 12. Even in this state, the seal ring 24 is functioning and may be left as it is, but desirably, the seal welding 17c is applied between the opening peripheral portion of the bolt hole 21 and the tightening bolt 17 as shown in FIG. . And
If the fastening bolt 17 projecting into the rear trunk 3 is in the way, the projecting portion is cut off.

(4) As described in (3) above, by removing all the tightening bolts 17 from the bolt holes 18 of the spacer 12 by rotating them, the spacer 12 is separated from the shield machine 1 The excavators 1 and 1 can independently perform tunnel excavation work. The detached spacer 12 is left in the ground and is not normally collected.

Next, an embodiment of the connecting device 41 on the front body 2 will be described with reference to the drawings. FIG. 6 shows DD in FIG.
7 is a sectional view taken along the line EE of FIG. 6, and FIG. 8 is a sectional view showing a portion F of FIG. 6 in a separated state of the shield machine.

As shown in FIG. 6, the connecting device 41 includes a pair of spacers 42 having a joint surface 42a curved in an arc shape on the outside according to the outer peripheral surface of the skin plate 2a of the front body 2. Each spacer 42 has a flat sliding surface 42b which is slidably joined to each other inside. An oval hole (also referred to as an oval hole) 43 curved in an arc shape as shown in FIG. 7 is formed at the center of one of the spacers 42 (upper side in FIG. 6), and the other (lower side in FIG. 6). A circular hole 43 ′ is formed in the center of the spacer 42, and the fastener 4 penetrating through the circular hole 43 ′
4 is slidably inserted along the inner peripheral edge of the oblong hole 43. In the present embodiment, the connecting tool 44 is used as the connecting tool 15 (FIG. 3).
(a)), an oval hole 45 corresponding to the oval hole 43 is provided on one of the skin plates 2a (upper side in FIG. 6).
In the other (lower side of FIG. 6) skin plate 2a, circular through holes 45 'corresponding to the circular holes 43' are respectively formed in the skin plate 2a. A flat portion 2b is provided around the through hole 45 '.
Are provided respectively. Each spacer 42 is fixed to the front body 2 by four fastening bolts 46. A flat portion 2c is provided around a bolt hole 48 inside the skin plate 2a. Is formed with a non-penetrating bolt hole 47 into which the tip of the tightening bolt 46 can be screwed. Further, an annular groove 49 is formed in a peripheral portion of the joint surface 42a of each spacer 42, and an annular seal member 50 is fitted in the annular groove 49 so that a part thereof projects outward.

The main difference between the connecting device 41 and the connecting device 11 is that a pair of spacers 42 are slidably joined on a sliding surface 42b as shown in FIG. An annular groove 51 is formed in the peripheral portion of the sliding surface 42b), and a seal ring 52 such as an O-ring, which is hard and has a sealing action, is fitted therein. Also, since the pair of spacers 42 need to be integrally connected when the shield machine 1 is separated, a pair of small-diameter insertion holes 53 sandwiching the oblong hole 43 or the circular hole 43 ′ as shown in FIGS. Has been drilled. A large-diameter insertion hole 54 is formed from the joint surface 42 a side of the spacer 42 toward the small-diameter insertion hole 53, and an end of the small-diameter insertion hole 53 is opened at the bottom end of the insertion hole 54. An opening 55 having the same diameter as the insertion hole 54 is formed at a position corresponding to the insertion hole 54 of the skin plate 2a, and a flat portion 2d is formed around the opening 55 inside the skin plate 2a. At least one of the flat portion 2d and the bottom end of the insertion hole 54 is provided with a water stop plate 56.5.
When 7 is detachably attached with a set screw, it is safer for normal water stoppage.

In the connecting device 41 of the present embodiment configured as described above, as shown in FIG. 6, the front body 2 of the shield machine 1 is connected by the connecting tool 44 penetrating the oval hole 43, and the spacer At 42, it is held at a predetermined interval. In order to generate a rolling force on the shield machine 1.1, a pair of spacers 42 are provided on the sliding surfaces 42b so that the directions of the front body 2 can be shifted in opposite directions.
And sealed by a seal ring 52 to prevent entry of high-pressure water or the like from the oblong holes 43, 45 or the circular holes 43 ', 45'.

Subsequently, the connection device 41 is separated by the following procedure.

(1) In FIG. 6, the water stop plates 56.5
7 is removed from the flat portion 2d and the bottom end of the insertion hole 54.
Note that the water stop plates 56 and 57 may or may not be attached.

(2) As shown in FIG. 8, a pair of spacers 42 are integrally connected by inserting a connecting bolt 58 into each small-diameter insertion hole 53, screwing a nut 59, and tightening. Further, a water blocking plate 57 is attached to the flat portion 2d of the skin plate 2a to close the opening 55.

(3) In FIG. 6, the nut 44 of the coupling tool 44 is used.
After rotating and removing the coupling c, the coupling tool 44 is moved to the head 44a.
Pull out to the side. In this state, since the seal ring 52 is functioning, entry of high-pressure water or the like into the shield machine 1 from the oblong hole 43 or the circular hole 43 'is prevented.
The water stop plate 60 is inserted into the oblong hole 4 from which the fastener 44 has been removed.
5 and the flat portion 2b around the circular through hole 45 'is attached by welding to close the holes 45 and 45'.

(4) The tightening bolt 46 is rotated, and the rotation is stopped in a state where the tip of the tightening bolt 46 has come off from the bolt hole 47 of the spacer 42. Desirably, seal welding is performed between the periphery of the opening of the bolt hole 48 and the tightening bolt 46 (FIG. 5).
(See (b)) and tightening bolts 46 protruding into front barrel 2.
Cut off the protruding part of.

(5) As described in the above (4), all the tightening bolts 46 are rotated out of the bolt holes 47 of the spacer 42 and pulled out, so that the integrally connected spacers 42 are removed.
42 is detached from the shield excavator 1.1, and the shield excavators 1.1 are separated from each other so that the tunnel excavation work can be performed independently. The detached spacers 42 are left in the ground and are not normally collected.

Although an example of the connecting devices 11 and 41 of the present invention has been described above, the present invention can be implemented as follows.

(A) Tightening Bolt 17 and Tightening Bolt 4
6 illustrates the case where the spacers are provided at the four corners of the spacers 12 and 42. However, the number may be smaller as long as the spacers can be stopped for sealing, and the number of both fastening bolts 17 and 46 may be increased. Alternatively, the pitch may be reduced and provided at equal intervals on the periphery.

(B) Each water stop plate 16, 56, 57,
60 can be attached to the flat portions 2b, 2d, 3b by screwing, for example, with a sealing member interposed, without welding.

(C) As described above, the connecting device 41 can be omitted.
3 and the oval through-holes 45 also provided on the skin plates 2a on both sides, the length of the oval arc can be reduced to about half.

(D) The case where the number of shield excavators 1 is two has been described as an example.

[0039]

As is apparent from the above description,
The connection device of the separation type shield machine according to the present invention includes:
It has the following excellent effects.

(1) The structure is simple and the rear body of the shield machine can be securely connected. In addition, the hole of the rear body required for connection at the time of separation is a lid (water stop plate) or a fastener and a seal. Blocked by a ring, high-pressure water and earth and sand are prevented from entering through the hole, and the shield machine can be separated by simple work procedures, greatly shortening the time required for separation and improving the ground. Is not required at all, so that the cost is considerably reduced.

(2) In the connecting device according to the third aspect, at the time of disconnection, the hole of the rear body required for connection is closed with a lid (water stopping plate) mounted on a flat portion or a fastener and a seal ring. As a result, intrusion of high-pressure water and earth and sand from the holes is reliably prevented.

[Brief description of the drawings]

FIG. 1A is a perspective view schematically showing a state in which two separate shield excavators are connected, and FIG. 1B is a schematic view showing a state in which two shield excavators are separated. It is a perspective view.

FIG. 2 is a central longitudinal sectional view of the shield machine shown in FIG. 1 in a connected state.

3 shows a connection device on the rear trunk side of a shield machine according to an embodiment of the present invention. FIG. 3 (a) is an enlarged sectional view taken along line AA of FIG. 2, and FIG. It is an expanded sectional view which shows an Example.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

5 (a) is an enlarged sectional view of a portion C in FIG. 3, and FIG. 5 (b) is an enlarged sectional view of the shield machine in a separated state.

FIG. 6 is an enlarged sectional view taken along the line DD of FIG. 2, showing a connection device on the front trunk side of the shield machine according to the embodiment of the present invention.

FIG. 7 is a sectional view taken along line EE of FIG. 6;

8 is a cross-sectional view showing a portion F of FIG. 6 in a separated state of the shield machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separation type shield excavator 2 Front trunk 3 Rear trunk 2a ・ 3a Skin plate 2b ・ 2c ・ 2d ・ 3b ・ 3c Flat part 11.41 Connecting device 12.42 Spacer 13.14 Through hole 15.44 Coupling tool 16.56・ 57 Water stop plate (lid) 17.46 Tightening bolt (Tightening tool) 18.21 ・ 47 ・ 48 Bolt hole (Screw hole) 19 ・ 49 Annular groove 20 ・ 50 Seal member 43 ・ 45 Oval hole 43 ′ · 45 'circular (through) hole 52 seal ring (seal member) 53 · 54 insertion hole 55 opening

Claims (3)

[Claims] 1. A connecting device for separably connecting a plurality of separate shield excavators in which a front body having a cutter disk rotatably provided at a tip thereof with respect to a rear body is flexibly connected. A spacer having an arcuate surface that can be joined to each of the rear bodies, and a spacer that penetrates the skin plate of each of the rear bodies, is provided on the spacer, while maintaining a predetermined interval between the rear bodies of the adjacent separated shield excavators. A screw hole communicating with the screw hole, a through hole passing through the spacer and a skin plate of a rear body on both sides of the spacer, and a rear body of the separated shield excavator which is penetrated by the through hole and is adjacent to the spacer. A coupling tool, screwed into the screw hole from the inside of the rear trunk, and inserted therethrough,
A fastening member screwed into the screw hole of the spacer to tighten the spacer; and an annular seal member interposed between the spacer and the outer surface of each of the rear bodies and surrounding the periphery of all the screw holes. A connection device for a separate shield excavator, characterized in that: 2. A hydraulic cylinder is used as the coupling tool, and a hydraulic cylinder is disposed in a rear trunk of one of the shield excavators.
A locking piece is pivotally attached to the distal end of the cylinder rod so as to protrude to both sides so that the cylinder rod can be inserted into the rear body of the other through a series of through holes of the skin plate and the spacer. A connection device for a separated shield machine according to claim 1. 3. A water stop plate for closing the screw hole and the through hole when the shield machine is separated, on the inner peripheral surface of each skin plate of the rear trunk, around the screw hole and the periphery of the through hole. 3. The connection device for a separation type shield machine according to claim 1, further comprising a flat portion to which a fastener is attached.