JP2021025239A - Double shield excavator - Google Patents

Abstract

To provide a double shield excavator capable of keeping overbreak small by matching an orientation of a rear body portion to a tunnel alignment, reducing an impact of excavation on a surrounding ground, preventing breakage of a segment of a tail portion of the rear body portion, and efficiently transmitting a jack thrust to the segment reducing an unsymmetrical pressure and load of the thrust jack.SOLUTION: Provided is a double shield excavator in which rear body portions 10B and 10B of two circular shield excavators 1A and 1B restrict movement close to and away from each other in a left and right direction X2 in a connection section of the rear body portion 10B, and the rear body portions 10B and 10B are connected to each other by a rear body swing device 7 provided so as to relatively swing around a swing axis C1 centered on the left and right direction X2.SELECTED DRAWING: Figure 2

Description

The present invention relates to a dual shield excavator.

Conventionally, as a double shield excavator in which two circular shield excavators in which the front body portion is refracted with respect to the rear body portion via a center folding device are connected to the left and right, for example, Patent Document 1. As shown, both rear torso are rigidly coupled to each other and actuate a mid-folding device provided between the anterior to rear torso in a spiraling excavator to rearrange the anterior torso. It is known that the body is changed to spiral and dig.

In this case, when the shield excavator on the spiral side is activated with respect to the shield excavator on the other non-spiral side to start the shield excavation, the shield excavator on the spiral side accompanies the excavation. The warping effect is generated by the increase in the ground reaction force, and the rotational force around the shield excavator on the non-spiral side is obtained, and the rotation is rotated around the shield excavator on the non-spiral side to excavate in a spiral linear manner.

Japanese Unexamined Patent Publication No. 2013-133651

However, in the conventional double shield excavator as shown in Patent Document 1, spiral excavation is performed only by the center folding operation. That is, conventionally, since the rear body portions of the shield excavator on the spiral side and the non-spiral side are fixed to each other, as shown in FIGS. 10A and 10B, in front of the shield excavator 100 on the spiral side. When the direction of the body portion 101 is changed, the direction L1 of the front body portion 101 and the direction L2 of the rear body portion 102 are inconsistent with each other. Therefore, the shield excavator 100 on the spiral side requires a large extra digging in the spiral direction (reference numeral 103 shown in FIG. 10B), which causes a problem that the surrounding ground is affected.

Further, as shown in FIG. 10A, since the orientation L2 of the rear body portion 102 and the orientation L3 of the segment 104 assembled in the planned alignment do not match, there is a portion where sufficient tail clearance cannot be secured, and the rear body portion 102 And the segment 104 compete with each other (the portion of the reference numeral T in FIG. 10A), and the segment may be damaged.
Further, in this case, the extension direction of the propulsion jack and the linear direction of the segment do not match, the jack thrust becomes unbalanced with respect to the segment, and a load is also generated on the propulsion jack. Therefore, there is room for improvement in that respect. was there.

The present invention has been made in view of the above-mentioned problems, and by matching the orientation of the rear body portion linearly with the tunnel, the over-digging can be suppressed to a small size, and the influence of the excavation on the surrounding ground can be reduced. It is an object of the present invention to provide a double shield excavator.
Another object of the present invention is a double shield excavator capable of preventing damage to the segment of the tail portion of the rear body portion, reducing the unbalanced pressure and load of the propulsion jack, and efficiently transmitting the jack thrust to the segment. Is to provide.

In order to achieve the above object, the double shield excavator according to the present invention has two circular shield excavators provided so that the front body portion can be refracted with respect to the rear body portion via a center folding device. It is a double-shielded excavator that is connected, and the rear body portions of the two circular shield excavators are restricted from moving in the left-right direction at the connecting portion of the rear body portion, and the above-mentioned It is characterized in that the rear body portions are connected to each other by a pin joint portion provided so as to be relatively swingable around the swing axis centered on the left-right direction.

In the double shield excavator according to the present invention, since the rear body portions connected to the left and right are not rigidly bonded but pin-joined, the rear body portion of the circular shield excavator on the spiral side is also on the non-spiral side. It can be swung around the swing axis with respect to the rear body of the circular shield excavator. Therefore, for example, when one circular shield excavator is spiraled with respect to the other circular shield excavator, the rear body is swung with respect to the front body refracted by the center bending device in the shield excavator on the spiral side. It can be made to follow.
Therefore, in the present invention, since the entire circular shield excavator on the spiral linear side can be swung, a warp effect is generated on the entire circular shield excavator on the spiral side due to the ground reaction force accompanying the excavation, and the non-spiral It is possible to obtain the rotational force around the shield excavator on the side. As a result, it is possible to excavate in a state where each direction of the front body portion and the rear body portion coincides with the planned alignment, and it is possible to efficiently perform the shield excavation of the spiral alignment that requires complicated construction management.

As described above, in the double shield excavator according to the present invention, it is possible to obtain a large spiral effect even with a small ground reaction force due to the warp effect over the entire length of the shield excavator. In addition, the rear body of the shield excavator swings around the swing axis, and the direction of the planned alignment matches the direction of the entire shield excavator, so that the necessary remainder during excavation in the circular shield excavator on the spiral side The amount of digging can be significantly reduced to about 10 mm, for example, where an extra digging thickness of about 300 mm was conventionally required. As a result, the influence of excavation on the surrounding ground can be reduced.

Further, according to the present invention, the tail clearance can be ensured because the rear body portion on the spiral side coincides with the planned alignment. Therefore, it is possible to prevent auction and contact between the tail portion of the rear body portion and the assembled segment to prevent damage to the segment, and it is possible to reduce the unbalanced pressure and load of the propulsion jack and efficiently transmit the jack thrust to the segment. Furthermore, the rear body of the shield excavator can be swung so that it matches the front body, and the rear body can be brought closer to the planned alignment of the tunnel, so that the tail and excavation in the rear body can be performed. It is possible to prevent auction with the wall surface and suppress obstacles to excavation.

Further, in the double shield excavator according to the present invention, the pin joint portion is provided with a convex engaging portion provided on one of the rear body portions and a concave portion provided on the other side to engage with the convex engaging portion. It is preferable that the convex engaging portion and the concave engaging portion swing relative to each other around the swing axis.

In this case, both rear body portions are pin-joined by swingably engaging the convex engaging portion provided on one rear body portion with the concave engaging portion provided on the other rear body portion. The configuration is such that it can swing. In this way, a swingable pin joint can be constructed by a simple structure by engaging the convex engaging portion and the concave engaging portion, so that complicated control and accuracy control during spiral excavation can be minimized. It can be suppressed to the limit and can be constructed efficiently.

Further, in the double shield excavator according to the present invention, the pin joint portion has a bolt fastening portion for fastening the wall portions of the rear body portion connected to the left and right, and the bolt fastening portion is the rear body. It is preferable that the left and right rear body portions relatively swing around the swing axis while being fastened to the portions.

In this case, by fastening with the bolt fastening portion, it is possible to more reliably regulate the movement of the rear body portions adjacent to the left and right in the left-right direction. That is, in the double shield excavator according to the present invention, the movement of the rear body portions adjacent to the left and right adjacent to each other in the left-right direction is restricted by the connection by the pin joint, but by fastening with the bolt fastening portion. , The rear body parts can be firmly connected to each other. Moreover, since the bolt fastening portion is also provided so as to be swingable around the swing shaft, it is also possible to swing around the swing shaft of the left and right rear body portions.

According to the double shield excavator of the present invention, by matching the orientation of the rear body to the tunnel linearly, it is possible to suppress the extra digging to a small size and reduce the influence on the surrounding ground due to the excavation.
Further, in the present invention, it is possible to prevent damage to the segment of the tail portion of the rear body portion, and to reduce the unbalanced pressure and load of the propulsion jack to efficiently transmit the jack thrust to the segment.

It is a horizontal sectional view of the double shield excavator according to the embodiment of this invention seen from above. It is a perspective view which looked at the double shield excavator shown in FIG. 1 from an oblique rear view, and is the figure which omitted the front body part. It is an exploded perspective view of the rear body rocking device provided in a double shield excavator. It is a perspective view which assembled the rear body rocking apparatus shown in FIG. 3, and is the view which was seen from the inside of the shield machine of the right excavator. It is a side view of the rear body rocking device seen from the inside of the shield machine of the right excavator. It is a cross-sectional view of the rear body swinging device viewed from the rear, (a) is a sectional view taken along line AA shown in FIG. 5, (b) is a sectional view taken along line BB shown in FIG. 5, (c). Is a sectional view taken along line CC shown in FIG. It is a figure for demonstrating the rocking operation of the rear body rocking device, and is the side view which saw the rear body rocking device from the inside of the shield machine of the right excavator. It is a side view schematically showing the swinging state of the right excavator on the spiral side, (a) is a view in which the rear body follows the front body, and (b) is a tunnel alignment of the right excavator. It is a figure of the state of excavating along. (A) to (c) are side views explaining the swing procedure of the rear body swing device in FIG. 7. It is a side view schematically showing the refraction state by the center bending mechanism of the right excavator on the spiral side, and (a) is a view of the state where the front body part is refracted with respect to the rear body part, (b). Is a diagram showing the positional relationship between the right excavator and the tunnel alignment.

Hereinafter, the double shield excavator according to the embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, in the double shield excavator 1 according to the present embodiment, the front body portion 10A is provided so as to be refractable with respect to the rear body portion 10B via a center folding device, and the two circular cross sections are circular. Shield excavators 1A and 1B are connected to the left and right. The rear body portions 10B and 10B of the circular shield excavators 1A and 1B adjacent to the left and right are pin-joined so as to be relatively swingable by the rear body swing device 7 (pin joint portion).

Here, in the double shield excavator 1, in a state where the two circular shield excavators 1A and 1B are arranged on the left and right, the left excavator 1A has a non-spiral left side in the traveling direction, and the right side is around the left excavator 1A. Let's call it a spiral right excavator 1B.
Further, in a state where the two circular shield excavators 1A and 1B are not bent in the middle, the centers thereof are referred to as shield center lines O1 and O2, and the directions along the shield center lines O1 and O2 are referred to as front-rear directions X1. In the front-back direction X1, the digging direction is called the front side and the front side, and the opposite side (starting side) is called the rear side and the rear side.

Each of the circular shield excavators 1A and 1B includes a shield machine main body 2 having a cylindrical skin plate (front body plate 2A, rear body plate 2B) and a cutter provided on the front side of the front body portion 10A and having a plurality of cutter bits. It includes a head 3, a mud feeding / draining device 4 that feeds muddy water to the cutter head 3 and drains excavated soil, and an elector device 5 for assembling the segment 11 in the shield machine. Further, the circular shield excavators 1A and 1B are provided with a center-folding jack 6 (center-folding device) and a rear body swinging device 7.

The shield machine main body 2 has a skin plate in which a front body plate 2A located in the front body portion 10A and a rear body plate 2B located in the rear body portion 10B are separately joined in the front-rear direction X1. Further, the shield machine main body 2 includes a partition wall 21 provided on the front body plate 2A and partitioning the chamber 3A on the face side and the inside of the shield machine, and a main body extending all around the shield machine inside the partition wall 21 in the circumferential direction. A ring 22 and a plurality of propulsion jacks 23 arranged at intervals in the circumferential direction inside the shield machine of the main body ring 22 are provided.

A space (chamber 3A) is formed in front of the partition wall 21 surrounded by the front body plate 2A to agitate the muddy water sent by the mud sending / discharging device 4 and the excavated earth and sand excavated by the cutter head 3. ing.

Inside the rear body plate 2B, the segment 11 is assembled by the erector device 5 at the same time as excavation. A tail seal 24 that seals a gap (tail clearance) with the outer peripheral surface of the assembled segment 11 is attached to the rear portion of the rear body plate 2B over the entire circumference of the rear body plate 2B. Here, the tail seals 24 are made of wire brushes and are arranged in two rows in the front-rear direction X1.

The shield machine main body 2 is equipped with an extra digging filling device (not shown) for injecting an extra digging filling material between the shield machine main body 2 and the excavated ground wall surface.
As will be described in detail later, when the right excavator 1B is spirally excavated with respect to the left excavator 1A by the double shield excavator 1, one of the right excavators 1B is compared with the case where the spiral excavator is not excavated. Since the wall surface of the excavated ground immediately after excavation with the cutter head 3 changes, the wall surface of the excavated ground is likely to collapse, so by installing an extra digging filling device, extra digging in the gap between the excavated ground immediately after excavation The filler is filled and the ground can be stabilized. Therefore, it is possible to accurately control the attitude of the double shield excavator 1 due to the collapse of the excavated ground.

The partition wall 21 is a partition wall that separates the face side from the inside of the shield machine so that water and earth and sand from the face do not flow into the inside of the shield machine main body 2 (inside the shield machine). In the partition wall 21, the rotation shaft 31 of the cutter head 3 is rotatably supported on the shield center lines O1 and O2. Further, the partition wall 21 is provided with a muddy water injection port for mud feeding and a sediment intake port that communicate from the inside of the shield machine into the chamber 3A. Each pipe of the mud feeding / draining device 4 (mud feeding pipe 41 and mud draining pipe 42, which will be described later) is connected to the muddy water inlet and the earth and sand intake port.

The propulsion jack 23 is arranged along the circumferential direction on the rear surface of the main body ring 22 in a state where the telescopic rod can protrude rearward. By extending the telescopic rod of the propulsion jack 23, the propulsive force of the circular shield excavators 1A and 1B is obtained by pressing against the front end surface of the segment 11 assembled inside the rear body plate 2B and taking the reaction force. ..

The cutter head 3 is supported by a cutter ring rotatably provided on the partition wall 21, and is rotatably provided with the shield center lines O1 and O2 as rotation centers by driving the cutter drive motor 32.
A copy cutter 35 that can appear and disappear outward in the radial direction is provided on the outer peripheral portion of the cutter head 3. The copy cutter 35 projects to the ground side with a predetermined amount of protrusion at a predetermined cutter rotation position, so that the copy cutter 35 is dug larger than the outer diameter of the cutter head 3.

The mud transfer device 4 includes a mud transfer pipe 41 for sending muddy water into the chamber 3A of the face being excavated, and a mud discharge pipe 42 for discharging muddy water in which excavated earth and sand and muddy water are mixed to the outside of the mine. , Is equipped. During excavation, muddy water is injected into the chamber 3A from the mud feed pipe 41 to keep the face at a constant pressure, and the mud water mixed with the excavated earth and sand to have an appropriate viscosity is injected into the shield machine by the mud drain pipe 42. It is taken in and transferred to the outside of the mine by a mud drainage pump (not shown) and carried out.

The erector device 5 has a gripping device supported by a ring-shaped swivel frame that swivels around the shield center lines O1 and O2.

As shown in FIG. 2, the rear body swinging device 7 regulates the movement of the two circular shield excavators 1A and 1B in the rear body portions 10B and 10B in the left-right direction X2, and regulates the movement of the rear body portions 10B and 10B. The 10Bs and 10Bs are connected so as to relatively swing around an axis (swing axis C1) centered on the left-right direction X2.

As shown in FIGS. 2 to 4, the rear body swinging device 7 is provided on a convex engaging portion 71 provided on the rear body portion 10B of the left excavator 1A and a convex engaging portion 71 provided on the rear body portion 10B of the right excavator 1B. It has a concave engaging portion 72 that engages with the engaging portion 71, and a connecting bolt 74 (bolt fastening portion) that fastens the rear body plates 2B and 2B of the rear body portions 10B and 10B that are connected to the left and right. ing.
The convex engaging portion 71 and the concave engaging portion 72 swing relatively around the swing shaft C1 without being separated from each other in the left-right direction X2 in a state where the connecting bolt 74 is fastened to the rear body portion 10B. (See FIG. 7).

As shown in FIGS. 3, 5 and 7, the convex engaging portion 71 is centered on the swing shaft C1 and is outside the rear body portion 10B of the left excavator 1A in the left-right direction X2 (after the right excavator 1B). It includes a disk-shaped base portion 711 that projects stepwise toward the body portion 10B side), and a rectangular convex portion 712 provided in the center of the base portion 711. In the base portion 711, the large diameter portion 711A on the rear body portion 10B side and the small diameter portion 711B on the right excavator 1B side are coaxially formed on the swing shaft C1, and the large diameter portion 711A and the small diameter portion 711B are respectively formed. A step portion 71a (see FIG. 6C) is formed between the outer peripheral portions of the above.

As shown in FIG. 6C, the bottom wall 722 (described later) of the concave engaging portion 72 is locked to the stepped portion 71a of the base portion 711 in a state of being sandwiched between the holding plate 73 and the stepped portion 71a. .. The outer surface of the large diameter portion 711A is the step portion 71a. A plurality of female screw holes 711b are formed on the outer surface 711a of the small diameter portion 711B.

As shown in FIGS. 4 and 5, a plate-shaped holding plate 73 is fitted onto the convex portion 712 from the right excavator 1B side.
The holding plate 73 has a substantially square shape in a plan view from the direction of the swing shaft C1, and a rectangular engaging opening 73a for fitting the convex portion 712 is formed in the central portion. As shown in FIG. 6C, the height of the small diameter portion 711B of the convex portion 712 from the outer surface 711a coincides with the thickness dimension of the engaging opening 73a of the pressing plate 73.

The outer shape of the holding plate 73 is set to a size that projects outward in the radial direction from the outer peripheral portion of the small diameter portion 711B of the convex engaging portion 71 in a plan view from the direction of the swing shaft C1. That is, in a state where the pressing plate 73 is fitted to the convex engaging portion 71, a locking groove 71b is formed between the large diameter portion 711A and the outer peripheral portion of the pressing plate 73, and concave engagement is performed with the locking groove 71b. The bottom wall 722, which will be described later, of the portion 72 is provided in a state of being sandwiched in the left-right direction X2.

As shown in FIGS. 4 and 5, the holding plate 73 has a swing shaft C1 with respect to the convex portion 712 because the opening shape of the engaging opening 73a and the outer shape of the convex portion 712 match. It is fitted around so that it cannot rotate. Further, the holding plate 73 is formed with a plurality of bolt holes 73b penetrating in the thickness direction around the engagement opening 73a. As shown in FIG. 6C, the holding plate 73 is fixed to the convex engaging portion 71 by being screwed into the female screw hole 711b by the bolt 75 through which the bolt hole 73b is inserted.

As shown in FIG. 7, the holding plate 73 is swingably housed in the opening hole 72b (described later) of the concave engaging portion 72.
As shown in FIGS. 4, 5 and 7, the holding plate 73 has a pair of vertical sides 731 and 732 extending in the vertical direction among four sides having a substantially square shape, and a pair of horizontal pieces 733 and 734. It extends horizontally. The vertical side 731 on the front side has an inclined portion 73c extending in the vertical direction from the lower end to the central portion in the vertical direction and gradually moving backward from the central portion toward the upper end. The vertical side 732 on the rear side has an inclined portion 73c that extends in the vertical direction from the upper end to the central portion in the vertical direction and gradually moves forward from the central portion toward the lower end. The upper horizontal piece 733 has an inclined portion 73c that extends horizontally from the front end to the central portion in the front-rear direction and gradually downwards from the central portion toward the rear end. The lower lateral piece 734 has an inclined portion 73c extending in the horizontal direction from the rear end to the central portion in the front-rear direction X1 and gradually increasing upward from the central portion toward the front end. Since the inclined portion 73c is formed on each side of the pressing plate 73 in this way, a gap (swing gap S) is formed between the inclined portion 73c and the opening hole 72b of the concave engaging portion 72. ..

Further, the pressing plate 73 is formed with a notched portion 73d notched in a concave shape in a part of the inclined portion 73c of each side 731, 732, 733, 734 (see FIG. 3). The notch portion 73d is formed by a substantially curved surface as a whole notch. A fixing piece 723 provided in the concave engaging portion 72, which will be described later, is locked to the notch portion 73d in a slidable state along the curved surface of the notch portion 73d.

As shown in FIGS. 6A to 6C, the concave engaging portion 72 projects outward from the rear body portion 10B of the right excavator 1B, fits the holding plate 73, and swings around the swing shaft C1. It is configured to be movable. The concave engaging portion 72 is formed so as to be recessed from the rear body portion 10B on the right excavator 1B side toward the outside (rear body portion 10B side of the left excavator 1A) in the left-right direction X2.

The concave engaging portion 72 includes an outer peripheral wall 721 forming a square inner peripheral surface 721a having substantially the same shape as the holding plate 73 in a plan view, and a bottom wall 722 covering the outer peripheral wall 721 from the left excavator 1A side in the left-right direction X2. And (see FIG. 3).

Each side of the outer peripheral wall 721 on the inner peripheral surface 721a is formed in a straight line corresponding to a straight portion formed on each side of the holding plate 73. Therefore, as described above, a swing gap S is formed between the inner peripheral surface 721a of the outer peripheral wall 721 and the inclined portion 73c of the holding plate 73 on each side, and is within the range of the swing gap S. The concave engaging portion 72 can swing around the swing shaft C1 with respect to the holding plate 73.

As shown in FIG. 6C, the bottom wall 722 is formed with an opening hole 72b coaxial with the swing shaft C1 and having the same inner diameter as the small diameter portion 711B. The concave engaging portion 72 is rotatable around the swing shaft C1 with the opening hole 72b fitted to the small diameter portion 711B.
The concave engaging portion 72 is fixed to the convex engaging portion 72 by bolting the pressing plate 73 to the convex engaging portion 71 after being fitted to the convex engaging portion 71. The movement of X2 in the left-right direction is restricted. That is, this prevents the rear body portion 10B of the left excavator 1A and the rear body portion 10B of the right excavator 1B from being separated in the left-right direction X2.

As shown in FIGS. 2 and 3, the connecting bolt 74 connects the left excavator 1A and the right excavator 1B in a state in which the rear body portions 10B are restricted from moving in the direction in which they are close to each other (left-right direction X2). , A pair is provided at a position in front of the engaging portion formed by the convex engaging portion 71 and the concave engaging portion 72 at a vertical interval. As shown in FIG. 6C, bolt holes 28A and 28B through which the same connecting bolt 74 is inserted are provided in the rear body plate 2B of the rear body portion 10B of the left excavator 1A and the right excavator 1B, respectively. ing.

As shown in FIGS. 3 and 6 (c), the second bolt hole 28B formed in the right excavator 1B is provided with an inner diameter substantially the same as the bolt shaft diameter of the connecting bolt 74. The first bolt hole 28A formed in the left excavator 1A is an elongated hole extending upward from a portion coaxial with the second bolt hole 28B in the direction of rotation about the swing shaft C1. The connecting bolts 74 inserted into the pair of bolt holes 28A and 28B are inserted from the inside of the shield machine of the right excavator 1B and tightened by the nut 74A in the shield machine of the left excavator 1A via the backing plate 74B. .. The pair of upper and lower connecting bolts 74, 74 slide in the range in the length direction of the elongated hole of the first bolt hole 28A when the right excavator 1B swings forward and upward with respect to the left excavator 1A.

Next, the operation and excavation method of the double shield excavator 1 described above will be described in detail with reference to the drawings.
Here, as shown in FIG. 2, the left excavator 1A is advanced straight, the right excavator 1B is spiraled with respect to the left excavator 1A, and the pair of circular shield excavators 1A and 1B are two in the lateral direction. The excavation method and the operation of the rear body swinging device 7 when excavating from the state of the series so as to be double in the vertical direction will be described.

When digging with the double shield excavator 1, as shown in FIG. 1, the center-folding jack 6 of the right excavator 1B is operated so that the front body portion 10A is oriented in a spiral direction with respect to the rear body portion 10B. Refract and dig, and align the tip of the excavator with the tunnel alignment. At this time, in the right excavator 1B, the copy cutter 35 also performs extra digging in the direction in which the front body portion 10A spirals. Subsequently, as shown in FIGS. 8A and 8B, a center-folding jack is used to align the center-folding point with the tunnel alignment at an appropriate timing when the front body portion 10A is aligned with the tunnel alignment as described above. Operate 6 to return the middle fold.

By this operation of returning the center fold, the rear body portions 10B and 10B of the pair of left and right circular shield excavators 1A and 1B are connected to each other by the rear body swinging device 7 in a swingable state by pin joining. The rear body portion 10B of the right excavator 1B swings with respect to the excavator 1A. That is, the rear body portion 10B swings so as to follow the front body portion 10A of the right excavator 1B, and the direction L2 of the rear body portion 10B can be made to match the direction L1 of the front body portion 10A. Here, reference numeral L0 shown in FIG. 8B is a planned linear (tunnel linear) of the tunnel. As shown in FIG. 8B, since the right excavator 1B whose direction is changed by rocking is excavated along the tunnel linear L0, the extra excavation can be reduced even during the spiral excavation.

Specifically, as shown in FIGS. 9A to 9C, the holding plate 73 provided on the convex engaging portion 71 and the inner peripheral surface 721a of the outer peripheral wall 721 of the concave engaging portion 72 are swayed. Since the moving gap S is formed, the rear body portion 10B of the right excavator 1B swings around the swing axis C1 with respect to the rear body portion 10B of the left excavator 1A within the range of the swing gap S. become. Here, FIG. 9A shows a state of the neutral position P0 in which the rear body swinging device 7 is not swinging, and FIGS. 9B and 9C are reference numerals P1'and P1 from the neutral position P0, respectively. In this order, the concave engaging portion 72 of the right excavator 1B swings forward and upward (arrow E) with respect to the convex engaging portion 71 of the left excavator 1A.

Here, as shown in FIG. 7, the fixed piece 723 of the concave engaging portion 72 can be replaced with a plurality of pieces having different swing gaps S from the notch portion 73d of the holding plate 73. For example, when the rear body portion 10B is fixed to the front body portion 10A without swinging, a fixed frame 723 having a swing angle of 0 ° is used as the swing gap S. Then, the swing angle can be adjusted by preparing a plurality of swing angles as the fixed top 723 in advance.

In this embodiment, it is preferable to install an appropriate measuring device at the installation location of the rear body swinging device 7 to measure and manage the load and the displacement amount at the time of construction. By performing such measurement, the load acting on the rear body swinging device 7 and its behavior can be grasped based on the acquired measured value, and reinforcement or the like can be performed as necessary.

Next, the operation of the double shield excavator 1 described above will be described in detail with reference to the drawings.
In the double shield excavator 1 according to the present embodiment, as shown in FIGS. 8 (a) and 9 (a) to 9 (c), the rear body portions 10B connected to the left and right are not rigidly joined to each other. Since it is pin-joined, the rear body portion 10B of the circular shield excavator 1B on the spiral side can also be swung around the swing axis C1 with respect to the rear body portion 10B of the circular shield excavator 1A on the non-spiral side. it can. Therefore, when the right excavator 1B is spiraled with respect to the left excavator 1A, the rear body portion 10b is swung to follow the front body portion 10A refracted by the center-folding jack 6 in the right excavator 1B on the spiral side. Can be made to.

Therefore, in the present embodiment, since the entire right excavator 1B can be swung, the warping effect due to the ground reaction force F (upward arrow in FIG. 8A) accompanying the excavation is exerted on the entire right excavator 1B. It can be generated and the rotational force of the left excavator 1A on the non-spiral side can be obtained. As a result, it is possible to dig in a state where the orientation L1 of the front body portion 10A and the orientation L2 of the rear body portion 10B are matched with the tunnel alignment L0 (see FIG. 8B), which is the planned alignment, and complicated construction management. It is possible to efficiently perform the spiral linear shield excavation that requires.

As described above, in the present embodiment, it is possible to obtain a large spiral effect even with a small ground reaction force from the warp effect over the entire length of the right excavator 1B. Further, the rear body portion 10B of the right excavator 1B swings around the swing axis C1 with respect to the rear body portion 10B of the left excavator 1A, and the planned alignment (tunnel alignment L0) and the orientation of the entire shield excavator (L1). , L2), the required extra digging amount during excavation in the right excavator 1B can be significantly reduced to about 10 mm, for example, where an extra digging thickness of about 300 mm was conventionally required. As a result, the influence of excavation on the surrounding ground can be reduced.

Further, in the present embodiment, the tail clearance can be secured because the rear body portion 10B of the right excavator 1B on the spiral side coincides with the planned alignment. Therefore, it is possible to prevent auction and contact between the tail portion of the rear body portion 10B and the assembled segment 11 to prevent damage to the segment 11, and to reduce the unbalanced pressure and load of the propulsion jack 23 shown in FIG. 1 to efficiently jack. Thrust can be transmitted to segment 11. Further, the rear body portion 10B of the shield excavator 1 can be swung so as to match the front body portion 10A, and the rear body portion 10B can be brought closer to the planned alignment of the tunnel. It is possible to prevent auction between the tail portion and the excavated wall surface in the above, and it is possible to suppress obstacles to excavation.

Further, in the case of the present embodiment, as shown in FIGS. 3, 5 and 6 (a) to 6 (c), right excavation is performed on the convex engaging portion 71 provided on the rear body portion 10B of the left excavator 1A. By engaging the concave engaging portion 72 provided in the rear body portion 10B of the machine 1B so as to be swingable, both rear body portions 10B and 10B can swing by pin joining. Since a swingable pin joint can be constructed by a simple structure by engaging the convex engaging portion 71 and the concave engaging portion 72 in this way, complicated control and accuracy control during spiral excavation can be performed. Can be minimized and can be constructed efficiently.

Further, in the present embodiment, by fastening with the connecting bolt 74, it is possible to more reliably regulate the movement of the rear body portions 10B and 10B adjacent to the left and right in the left-right direction X2. That is, in the double shield excavator 1 according to the present embodiment, the movement of the rear body portions 10B adjacent to the left and right in the left-right direction X2 is restricted by the connection by the rear body rocking device 7, but the connection bolt By fastening at 74, the rear body portions 10B can be firmly connected to each other. Moreover, since the connecting bolt 74 is also provided so as to be swingable around the swing shaft C1, it is also possible to swing the left and right rear body portions 10B and 10B around the swing shaft C1.

As described above, in the double shield excavator 1 according to the present embodiment, by matching the directions of the rear body portion 10B of the right excavator 1B on the spiral side in a tunnel linear manner, the extra digging can be suppressed to a small size, and the digging can be performed. The impact on the surrounding ground can be reduced.
Further, in the double shield excavator 1 according to the present embodiment, damage to the segment 11 of the rear body portion 10B can be prevented, and the unbalanced pressure and load of the propulsion jack 23 can be reduced to efficiently transmit the jack thrust to the segment 11. ..

Although the embodiment of the double shield excavator according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately modified without departing from the spirit of the present invention.

For example, in the present embodiment, the rear body swing device 7 by engaging the convex engaging portion 71 and the concave engaging portion 72 is adopted as the pin joint portion, but the configuration is limited to such a configuration. It suffices that the rear body portions 10B and 10B of the left and right circular shield excavators 1A and 1B can swing around the swing shaft C1. Further, in the present embodiment, the rear body portion 10B of the right excavator 1B is configured to swing only forward and upward with respect to the neutral position P0, but forward and downward with respect to the neutral position P0. A mechanism that can swing to both of them may be used.

More specifically, as the spiral pattern that can be dug by the double shield excavator 1 described above, either one of the right excavator 10A and the left excavator 10B arranged in the horizontal direction is clockwise or counterclockwise with the other as the baseline. There are 4 patterns that spiral in. Further, there are four patterns in which one of the right excavator 10A and the left excavator 10B arranged in the vertical direction spirals clockwise or counterclockwise with the other as the baseline. In addition, there are four patterns in which both the right excavator 10A and the left excavator 10B arranged in the horizontal or vertical direction spiral clockwise or counterclockwise.

Further, in the present embodiment, the connecting bolt 74 is provided in the rear body swinging device 7, but also in the engaging portion between the convex engaging portion 71 and the concave engaging portion 72, the concave engaging portion 72 is formed by the holding plate 73. Since the bottom wall 722 is sandwiched between the left and right rear body portions 10B and 10B, the movement of the left and right rear body portions 10B and 10B in the left-right direction X2 is restricted. Therefore, in the rear body swinging device 7 of the present embodiment, it is possible to omit the connecting bolt 74.

Further, in the present embodiment, the swing range of the pin joint portion (rear body swing device 7) is the size of the swing gap S formed between the holding plate 73 and the outer peripheral wall 721 of the concave engaging portion 72. Although specified, the size of the swing gap S can be set arbitrarily. Further, a configuration in which such a swing range is not provided may be used.

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention.

1 Double shield excavator 1A Left excavator 1B Right excavator 2 Shield machine body 2A Front body plate 2B Rear body plate 6 Center folding jack (center folding device)
7 Rear body swing device (pin joint)
10A Front body part 10B Rear body part 11 Segment 71 Convex engagement part 72 Concave engagement part 73 Holding plate 73c Inclined part 73d Notch part 74 Connecting bolt (bolt fastening part)
712 Convex part 721 Outer wall C1 Swing axis L1, L2 Direction L0 Tunnel linear

Claims (3)

It is a double shield excavator in which two circular shield excavators provided so that the front body can be refracted with respect to the rear body via a center folding device are connected to the left and right.
The rear body portions of the two circular shield excavators are restricted from moving in the left-right direction at the connecting portion of the rear body portion, and the rear body portions are centered on the left-right direction. A double shield excavator characterized in that it is connected by a pin joint provided so as to be relatively swingable around the swing axis. The pin joint has a convex engaging portion provided on one of the rear body portions and a concave engaging portion provided on the other and engaging with the convex engaging portion.
The double shield excavator according to claim 1, wherein the convex engaging portion and the concave engaging portion swing relative to each other around the swing axis. The pin joint has a bolt fastening portion for fastening the wall portions of the rear body portion connected to the left and right.
The double shield according to claim 1 or 2, wherein the left and right rear body portions relatively swing around the swing axis while the bolt fastening portion is fastened to the rear body portion. Excavator.

Images