JPH09228777A - Mesail shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of large size in a shield machine and improve the steering performance thereof by arranging intermediate jacks connecting both frames in an open chevron form, and acctaching the midway of each jack to a frame through universal connection tools. SOLUTION: A front frame 10 and a tail frame 11 are connected by intermediate jacks 12, 12, and a front mesail 15 and tail mesail 16 are arranged slidably at sides of both the frames 10, 11. Pressure jack is arranged between the respective mesails 15, 16 and the respective frames 10, 11. The intermediate jacks 12, 12 are arranged in an open chevron toward the excavation direction, and the midway thereof is attached to the front frame 10 through universal connection tools 22, 22. Accordingly, even if the intermediate jacks 12 have a long stroke, the shield machine is not made large streered with a small radius of curvature. With the horizontal commponent of force generating in the intermediate jack 12, curve work is made smooth.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a messel shield machine having a steering function.

[0002]

2. Description of the Related Art Equal-length messels are provided on both sides of a box-shaped frame for supporting earth pressure, and press-fit jacks are arranged between each messel and the frame to promote messels by extending individual press-fit jacks. A self-propelled Messel shield machine is known which repeats an operation and a forward operation of a frame by a contraction operation of all jacks. This type of Messel shield machine has many advantages, such as excavation and backfilling can be performed in parallel, excellent in workability, and non-vibration and noise-free soil retention while keeping the ground opening range to the minimum necessary. Have.
Also, as shown in FIG. 13, the messel and the frame are divided into front and rear parts, and the front frame a and the tail frame b are connected with the intermediate jack c.
There is also known a messel shield machine in which the butting between the tail messel e and the tail messel e are connected by a pin. When changing the direction of this type of messel shield machine, the earth pressure resistance difference is generated on the left and right by changing the number of excavated left and right messels d. Steering in the direction of. At this time, the intermediate jack c outside the curve is extended so as not to hinder the displacement of the front frame a. After the front frame a is steered, the two intermediate jacks c are simultaneously contracted to cause the tail frame b to follow the front portion.

[0003]

The Messel shield machine described above has the following points to be improved. <A> To increase the steering angle, the stroke length of the intermediate jack c may be designed to be long. However, since the intermediate jack c is set to have the same stroke as the press-fit jack, if a long stroke is used for the intermediate jack c or the press-fit jack, the overall length of the Messel shield machine becomes longer, and the radius of curvature cannot be reduced. In addition, since the total length of the Messel shield machine becomes longer, the amount of extra excavation generated from the locus of the shield machine increases, which is not preferable. <B> The bending angle of the Messel shield machine is restricted by the crossing width of the machine, and the larger the crossing width of the machine, the smaller the bending angle and the smaller the turn. <C> Since a large play cannot be ensured at the connecting portion between the intermediate jack c and the tail frame b, the bending angle of the intermediate jack c with respect to the tail frame b has a certain limit. Therefore, when the direction is changed, the intermediate jack c and the tail frame b
When a bending force greater than the limit angle acts on the connecting portion, the intermediate jack c and the connecting bracket of the frame b are easily damaged. <D> When the direction is maximally changed, the intermediate jack c on the outside of the curve extends in the entire stroke while the intermediate jack c on the inside of the curve maintains the contracted state. In this state, if the right and left intermediate jacks c are contracted simultaneously to pull the tail frame b, there is no contraction stroke of the intermediate jack c inside the curve, and the tail frame b cannot be pulled. For this reason, in order to draw the tail frame b, a slight contraction stroke must be secured in the intermediate jack c inside the curve, and the direction change of the front frame a and the pulling of the tail frame b must be performed little by little. It is inefficient and takes a long time to change directions. <E> As shown in FIG. 14, connecting jigs f and g provided at the inner ends of the front and rear messels d and e are fitted, and a horizontal connecting pin h made of a hexagon socket head bolt is passed through the fitting portion. The messels d and e are connected so as to be able to cope with a vertical displacement. Therefore, before and after messel d,
When a bending force in the messel penetration direction acts on the connection part of e,
The connection may be damaged.

The present invention has been made in view of the above points, and an object of the present invention is to provide the following Messel shield machine. Messel shield machine that can improve the steering performance (steering angle and radius of curvature) without increasing the machine length. Messel shield machine that prevents damage to the intermediate jack and its connection. A Messel shield machine in which stress is not concentrated on the connection between the front and rear Messel during direction change.

[0005]

The invention according to claim 1 is
In the messel shield machine where the front frame and the tail frame are connected by an intermediate jack, multiple messels are slidably arranged on the sides of both frames, and a press-fit jack is arranged between each messel and the frame.
It is a Messel shield machine, characterized in that the middle jack is attached to the frame. According to a second aspect of the present invention, in the first aspect, an intermediate jack is arranged between the front frame and the tail frame in a V shape so as to generate an inward horizontal component force in the tail frame. It is a Messel Shield machine characterized by that. According to a third aspect of the present invention, in the first aspect, the intermediate jack is arranged in parallel with the machine between the front frame and the tail frame so that an inward horizontal component force is generated in the tail frame. , Messel Shield machine. According to a fourth aspect of the present invention, in any one of the first to third aspects, the intermediate jack is swung in all directions by interposing a universal connector having a vertical and horizontal spindle between the intermediate jack and the frame. It is a Messel shield machine characterized by allowing it to be attached. The invention according to claim 5 is the messel shield machine according to any one of claims 1 to 4, characterized in that the longitudinal and lateral directions are allowed to rotate to connect the front and rear messels. According to a sixth aspect of the present invention, in the fifth aspect, a spherical portion is inserted between the facing surfaces of the connecting plate and the connecting bracket that inserts and connects the connecting pin between the front and rear messels, and rotation in the vertical and horizontal directions is allowed. It is a Messel Shield machine characterized by connecting the front and rear Messel. According to a seventh aspect of the present invention, in the fifth aspect, a connecting plate extending to the other Messel is inserted between the connecting brackets provided on one of the front and rear Messel,
The connecting pin is inserted and connected, and the base end of the connecting plate is pivotally supported by a vertical support shaft orthogonal to the connecting pin to allow rotation in the vertical and horizontal directions to connect the front and rear messels. , Messel Shield machine.

[0006]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <A> Overall Configuration FIG. 1 shows a plan view of a Messel shield machine, and FIG. 2 shows a longitudinal sectional view thereof. The Messel shield machine includes a rigid front frame 10 and a tail frame 11, and the frames 10, 11 are connected by a plurality of intermediate jacks 12. The connection structure of the intermediate jack 12 will be described later.

Each of the frames 10, 11 is constituted by disposing a plurality of cut beams between frames in which a plurality of horizontal reinforcing members are integrally joined in a direction of intersection of a plurality of vertical column members. The tail frame 11 is provided with cutting beams 11a and 11b on the front and rear, and
A space for hanging the object A is secured between 1a and 11b.
In the drawing, reference numeral 11c denotes an earth retaining plate provided on the tail frame 11, and the earth retaining plate 11c is brought into contact with the peripheral surface of the buried object A so as to prevent the backfill soil (not shown) from entering the hanging space of the buried object A. It has become. Tail frame 1 during excavation
A horizontal beam 13 extending at the front of the tail frame 11 is mounted on a support beam 14 extending at the rear of the front frame 10 to suppress the sedimentation of the front frame 10.

The front frame 10 and the tail frame 11 are each formed of an integrally molded product or are formed of upper and lower divided bodies having a horizontal joint, and are integrally assembled on site by bolting or welding. Each frame 10, 1
A plurality of front messels 15 and tail messels 16 are slidably arranged on both sides of
The pin 5 and the tail messel 16 are connected by a pin. The front frame 10 and each front messel 15 are connected with a press-fit jack 17 respectively. The front messel 15 and the tail messel 16 excavate in the cutting direction by the extension operation of the individual press-in jacks 17, and the front frame 10 is contracted by the contraction operation of all the press-in jacks 17, and the tail frame 11 is contracted by the contraction operation of the intermediate jacks 12, respectively. It can be pulled in the direction of excavation. A bottom messel 19 is slidably provided at the bottom of the front frame 10 via a bottom jack 18.
Further, a sled body 20 is provided at the bottom of the tail frame 11. Incidentally, 21 is each of these jacks 12, 1
A control unit for controlling the hydraulic pressures 7 and 18 is mounted on the front frame 10 side.

<B> Intermediate Jack Attachment Structure The intermediate jacks 12 and 12 are direction changing cylinders and are arranged between the front frame 10 and the tail frame 11 in a V-shape in the excavation direction. That is, the intermediate jack 1
The opposing distances on the front side of the Messel shield machine are smaller than the opposing distances on the rear side of the Messel shield machine. This is because a horizontal component force is generated in the intermediate jack 12 and the tail frame 11 is efficiently attracted.

The intermediate jacks 12 are attached to the front frame 10 through the universal connecting member 22 so as to allow the intermediate jacks 12 to pivot in all directions.
The two ends are connected to the tail frame 11. The middle jack 12 is supported in the middle of the middle jack 12.
This is to prevent the overall length of the machine from increasing by setting the distance between the frames 10 and 11 small while taking a long stroke.

Referring to FIGS. 3 and 4, the free connector 22 will be described. A pair of horizontal brackets 23 are fixed to the front frame 10 by bolts or welding. Vertical support shafts 26 and 26 are provided on the upper and lower surfaces of the outer frame 25, respectively.
Are provided, and holes 24, 2 of both horizontal brackets 23, 23 are provided.
4, the outer frame 25 is turned laterally around the vertical support shafts 26, 26. Intermediate jack 12
The inner frame 27 is attached in the middle of the cylinder portion 12a of
Horizontal support shafts 28, 28 projecting from the left and right side surfaces of the inner frame 27 are inserted through the holes 29, 29 of the outer frame 25,
(The intermediate jack 12) is connected to the horizontal support shaft 2 with respect to the outer frame 25.
It turns in the vertical direction around 8, 28.
That is, the intermediate jack 12 is supported so as to be allowed to pivot in all directions about the vertical support shafts 26, 26 and the horizontal support shafts 28, 28. The horizontal support shafts 28 may be directly provided on the cylinder portion 12a of the intermediate jack 12.

The distal end of the rod portion 12b constituting the intermediate jack 12 is located between the horizontal brackets 30, 30 provided on the tail frame 11, and each hole 12c provided at the distal end of the horizontal bracket 30 and the rod portion 12b. , 31 are connected so as to allow the movement in all directions by penetrating the connecting pin 32. The structure shown in the drawing will be described. The spherical bearing 3 is provided between the connecting pin 32 and the hole 12c of the rod portion 12b.
3 is shown. Reference numeral 34 in FIGS. 3 and 4 designates a stop plate which is fitted to the neck of the connecting pin 32 and regulates falling off.

[0013]

Next, a method of excavating the Messel shield machine will be described.

<A> Straight Traveling FIGS. 1 and 2 show the Messel shield machine when traveling straight. Left and right intermediate jacks 12 arranged in a V shape in the direction of excavation,
12 is set to the same stroke (the most contracted state). After the jacks 17 and 18 are extended and the messels 15, 16 and 19 are excavated to the cutting side, the front frame 10 is advanced by contraction of the jacks 17 and 18. At this time, the intermediate jacks 12, 12 extend by the same stroke in accordance with the amount of advance of the front frame 10. Next, the tail frame 11 is drawn toward the front frame 10 by contracting the intermediate jack 12. Considering the stress when the tail frame 11 moves straight based on FIG. 6, the contraction forces F, F of the intermediate jacks 12 are the component force F ₁ (thrust) toward the front of the machine and the horizontal component F F toward the inside of the machine. ₂ , the horizontal component F of each intermediate jack 12
_2, since F ₂ is cancel each other at equal force in inward to each other, the tail frame 11 by a component force F ₁ to the machine forward
Will go straight.

<B> Direction Conversion FIG. 5 is a plan view of the Messel shield machine when the direction is changed to the left with respect to the excavation direction. Front Messel 15
Alternatively, when the bottom messel is expanded or contracted, a difference in the number of excavated left and right messels causes a difference in the friction resistance between the left and right messels. Therefore, the front frame 10 shifts to the one having the larger friction resistance. At this time, the pressure of the intermediate jack 12 is reduced, and the displacement of the front frame 10 is allowed while the intermediate jack 12 on the side (outside the curve) where the frictional resistance is small extends. When the direction change of the front part is completed, the left and right intermediate jacks 12 are contracted to draw the tail frame 11 to the front side.

The stress at the time of the direction change will be considered based on FIG. When contracting the intermediate jack 12, 12, the horizontal force F ₂ directed to the component force F ₁ and the machine interior to the machine front occurs and tail frame 11 by the force component F _1, F ₁ to each machine forward Moving forward is as described above.

Here, since the intermediate jacks 12, 12 are arranged in a C-shape toward the excavation direction, horizontal component forces F ₂ , F _{2 of} the respective intermediate jacks 12, 12 are generated toward the inside of the machine. . Intermediate jack 1 outside the curve when changing direction
Since the second horizontal force component F _2, always dominant with respect to the horizontal component of force F ₂ of the curve inner side of the intermediate jack 12 (outer F _2> in F ₂₎ to the same direction following the tail portion in the front portion Will be shifted to

Further, since the stroke of the intermediate jack 12 can be set to be larger than that of the press-fit jack 17 or the bottom jack 18, the bending angle (steering angle) of the machine becomes large and the radius of curvature at the time of direction change becomes small. Conventionally, since both ends of the intermediate jack were connected to each frame, an attempt to increase the stroke of the intermediate jack affected the overall length of the machine. In the present invention, however, the intermediate jack 12 is supported halfway, so the intermediate jack is supported. Increasing the 12 strokes does not affect the overall length of the machine.

If the intermediate jacks 12, 12 are arranged in a C-shape, the direction can be smoothly changed by following the front frame 10 of the tail frame 11 for the above reason. still,
Excavating the ground on the steering direction side of the front frame 10 with a backhoe or the like in advance is the same as in the related art.

[0020]

Second Embodiment of the Invention Above, the intermediate jacks 12, 12
Although the case where the intermediate jacks 12 are arranged in a V shape has been described, the intermediate jack 12 may be arranged in parallel with both the frames 10 and 11 as shown in FIG. In the present example, although not shown, the intermediate jack 12 is supported by the front frame 10 through the above-described universal connector 22. In the case of the present embodiment, in the case of FIG. 8, the horizontal component forces F ₂ and F ₂ of the respective intermediate jacks 12 and 12 are generated toward the inside of the curve, but the horizontal component force (F ₂ + F ₂ ) Since the stress is small, the tail portion has a small function of following the front portion and shifting in the same direction.

[0021]

Third Embodiment FIGS. 9 to 12 show another embodiment in which the connecting portion between the front messel 15 and the tail messel 16 has a particularly large angle of freedom (degree of freedom) in the messel penetrating direction. In the description of the present embodiment, the same parts as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 9 shows an example in which projecting spheres 36 are provided on both surfaces of a connecting plate 35 extending from the tail messel 16. The sphere portion 36 is a sphere that can be inserted between the connecting brackets 37, 37 provided opposite to the end of the front messel 15 and whose diameter gradually increases from the center to the outside at the axis thereof. A hole 39 is formed so that displacement with the connecting pin 38 is allowed. In short, it is only necessary that the spherical portion 36 is supported by the connection brackets 37, 37 in a substantially point contact relationship. Incidentally, in FIG. 9, the ball portion 3 previously manufactured as a separate member is used.
6 is provided integrally with the connecting plate 35 by welding.
Of course, the connecting plate 35 itself may be formed integrally with the spherical portion 36. In the present embodiment, since the ball portion 36 is provided on the detachable connecting plate 35, it is easy to cope with a case where the ball portion 36 is missing or worn.

FIG. 10 shows a sphere 36 connected to a connecting bracket 37,
Another form is shown in which the connecting plate 35 is provided between the protruding ends of the hemispherical spheres 36, 36, respectively, provided on the opposing surface side of 37. In the present embodiment, the pin hole 39
May be processed into a spherical shape, or the corners of the pin holes 39 may be chamfered.

FIG. 11 shows another embodiment in which a spherical bearing 40 is interposed between the connecting portions of the connecting plate 35 and the connecting pins 38.
The spherical bearing 40 includes an inner cylinder 41 having a spherical outer peripheral surface and an outer cylinder 42 having a concave surface corresponding to the outer peripheral surface of the inner cylinder 41. The outer cylinder 42 is connected to the connecting plate 3 directly or via a connecting member 43.
5 is fixed.

FIG. 12 shows another embodiment in which the connecting plate 35 is rotatably connected by a vertical support shaft 44 orthogonal to the connecting pins 38. FIG. The base end of the connecting plate 35 is located between brackets 45, 45 (one is omitted in the drawing) provided on the tail messel 16, and a vertical support shaft 44 is inserted through these overlapping portions.
In the present embodiment, the connecting plate 35 and the bracket 45,
Both mesels 15 and 16 are bent in the messel penetrating direction around the vertical support shaft 44 between the mesels 45. Also Messel 1
5 and 16 are also similar to the above-described embodiment in that they rotate in the vertical direction about a connection pin 38 that connects between the connection plate 35 and the connection bracket 37.

In FIGS. 9 to 12, reference numeral 46 is a thin iron plate covering plate extending to the front messel 15, which functions to prevent the entry of earth and sand between the connecting portions of both messels 15 and 16. To do. The cover plate 46 has flexibility enough to bend following the tail messel 16.

In the connection structure of the conventional messels d and e shown in FIG. 14, the bending radius of the connecting portion between the messels d and e in the messel penetration direction is small, so that the radius of curvature of the machine is at least about 80 m. Was the limit. On the other hand, in the present invention, by adopting the connection structure described with reference to FIGS. 9 to 12, a large bending angle between the two messels 15 and 16 can be ensured. is there.

[0028]

As described above, the present invention has the following effects. <B> Since the middle jack is supported by the frame, the distance between the front frame and the tail frame does not have to be designed wide even if the total length of the middle jack is increased. Therefore, even if an intermediate jack having a long stroke is employed, the Messel shield machine does not increase in size, and a Messel shield machine having a small radius of curvature and capable of steering at a large angle is obtained. <B> By arranging the intermediate jack between the front frame and the tail frame in a C-shape facing the digging direction, the horizontal component of the intermediate jack outside the curve is greater than the horizontal component of the inside of the curve. Therefore, in the bending work, the tail part can follow the bending direction of the front part and perform a smooth bending work. <C> A universal connector having a vertical and horizontal support shaft is interposed between the intermediate jack and the frame. Therefore, during the direction change, excessive stress does not concentrate on the attachment part of the intermediate jack,
It is possible to effectively prevent the intermediate jack and its attachment portion from being damaged or damaged. <D> Since the front and rear messels are connected by allowing rotation in the vertical and horizontal directions, stress can be prevented from being concentrated at the connection between the front and rear messels, and the radius of curvature of the messel shield machine is reduced, resulting in small turning performance. Is improved.

[Brief description of drawings]

Fig. 1 Plan view of the Messel shield machine

FIG. 2 is a longitudinal sectional view thereof.

FIG. 3 is a side view of an attachment portion of an intermediate jack with a part broken.

FIG. 4 is a perspective view for explaining the attachment structure of the intermediate jack.

FIG. 5 is a plan view of the Messel shield machine when changing directions.

FIG. 6 is a stress diagram of the machine when traveling straight ahead.

FIG. 7 is a stress diagram of a machine when changing directions.

FIG. 8 is a stress diagram when changing the direction of a Messel shield machine in which an intermediate jack is arranged in parallel with the machine.

FIG. 9 is an explanatory view according to Embodiment 2 of the present invention, and is a cross-sectional view of a connecting portion between a front messel and a tail messel.

FIG. 10 is a cross-sectional view of a connecting portion of both messels, showing another connecting structure in which a ball portion is provided on the connecting bracket side.

FIG. 11 is a cross-sectional view of the connecting portion of the two messels, showing another connecting structure in which a spherical bearing is inserted between the connecting portions of the two messels.

FIG. 12 is a cross-sectional view of a connecting portion of both messels showing another connecting structure in which a connecting plate is pivotally supported rotatably.

FIG. 13 is a plan view of a Messel shield machine based on the present invention.

FIG. 14 is a cross-sectional view of a messel connection part based on the present invention.

Claims (7)

[Claims] 1. A front frame and a tail frame are connected by an intermediate jack, a plurality of messels are slidably arranged on the sides of both frames, and a press-fitting jack is arranged between each messel and the frame. The Messel Shield machine is characterized in that the middle of the intermediate jack is attached to the frame. 2. The intermediate jack according to claim 1, wherein an intermediate jack is arranged between the front frame and the tail frame so as to generate an inward horizontal component force in the tail frame in a V-shape in the excavation direction. And the Messel Shield machine. 3. The Messel shield according to claim 1, wherein an intermediate jack is arranged in parallel with the machine between the front frame and the tail frame so that an inward horizontal component force is generated in the tail frame. Machine. 4. The intermediate jack according to any one of claims 1 to 3, wherein the intermediate jack is allowed to swivel in all directions by interposing a universal connector provided with vertical and horizontal spindles between the intermediate jack and the frame. Messel shield machine characterized by being attached by 5. The Messel shield machine according to any one of claims 1 to 4, wherein the front and rear messels are connected by allowing rotation in the vertical and horizontal directions. 6. The front and rear parts according to claim 5, wherein a spherical portion is inserted between the opposing surfaces of the connecting plate and the connecting bracket for inserting and connecting the connecting pin between the front and rear mesels so as to allow the vertical and horizontal rotation. A Messel shield machine characterized by connecting between the Messels. 7. The connection plate according to claim 5, wherein a connecting plate extending to the other messel is inserted between the connecting brackets provided on one of the front and rear mesels, and the connecting pin is inserted and connected, and the base end of the connecting plate. Is a vertical support shaft that is orthogonal to the connecting pin, and allows vertical and horizontal rotation to connect the front and rear messels.