JP2000226988A - Shield driving machine and shield driving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield driving machine capable of performing complicated rolling corrections without requiring a complicated rolling correction mechanism. SOLUTION: This shield driving machine is for excavating an underground pit having non-circular cross section and comprises a cutter head 4, a front drum 2 with the whole portion made in one united body, and a rear drum 1 coupled to the rear portion of the front drum 2 by fitting the end portions together. A twisting mechanism constituted with a pair of jacks 6 so as to twist the front drum 2 fixed to the rear drum relative to the rear drum 1 and a round bar 8 for transmitting the force of the jack 6 is arranged at the top and bottom inside the main body of the shield drive driving machine, the front drum 2 is supported by the rear drum 1 through a support bracket 9 provided with a slot 9a and a round bar 8 inserted to the slot 9a, and a gap sufficient for permitting the twisting motion is provided between the end portions of the drums 1, 2 fitted together, and the front drum 2 is made twistable by varying the center point of twist by the upper and lower twisting mechanisms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine for excavating an underground pit having a cutter head, a front body and a rear body and having a non-circular cross section, and a shield method using such a shield machine.

[0002]

2. Description of the Related Art Conventionally, as a shield machine, besides a general shield machine for excavating an underground pit having a circular cross section,
2. Description of the Related Art A shield machine for excavating an underground pit having various non-circular cross-sections such as an overlapped circle having a shape in which a plurality of circles are partially overlapped, or a substantially square, elliptical, or horseshoe shape is known. In these shield excavators, in the process of excavating the ground, a phenomenon called so-called rolling in which the shield excavator main body rotates around the center axis of the shield excavator main body or the axis of the bottom longitudinal direction thereof occurs. . In particular, shield excavators that excavate underground tunnels with non-circular cross-sections, especially shield excavators that excavate underground tunnels with a rectangular cross-section are difficult to correct once such rolling occurs. Become. In addition, when the rolling becomes large and the tail clearance (the gap between the inner surface of the tail plate having the segment assembling space and the outer surface of the existing segment) cannot be secured, the segments cannot be assembled, and as a result, the shield excavator is propelled. There is also a major problem in that the force cannot be taken in segments, and the excavation of the shield excavator itself becomes impossible.

Conventionally, a technique for solving such a problem has been proposed in Japanese Patent Application Laid-Open No. 9-250294. Therefore, the technology proposed in this publication is positioned as a conventional technology for the invention of this application, and the technical contents will be outlined with reference to FIGS. FIG. 6 is a perspective view schematically showing a shield machine according to the related art, and FIG.
Is a horizontal cross-sectional view near the bottom of the shield machine shown in FIG. 6, and FIG.
FIG. 9 is a cross-sectional view showing a state when the rolling of the second embodiment is corrected, and FIG. 9 is a cross-sectional view showing a state where the rolling of the second embodiment is corrected in the shield machine according to the related art.

In these figures, reference numeral 1 denotes a rear body having a vertically-long rectangular cross section serving as a tail plate having an assembly space for segments therein, and 2 denotes a vertically-long rectangular cross section provided with a cutter head 5 at a front portion. The front fuselage 2 and the rear fuselage 1 constitute a shield machine body. Reference numeral 3 denotes a center bending jack connecting the front and rear trunks so that the shield machine can be bent in the middle. 4 is a cutter head for excavating the ground. By doing so, it is a copy cutter that can be dug so as to widen the excavated cross section of the cutter head 4.

[0005] In the prior art shown here, the front fuselage 2 is not integrally formed as a whole like a conventional shield excavator of this kind, and the front fuselage 2a and the middle fuselage 2b are not integrally formed. The lower body portion 2c is divided into three stages. The rear body 1 is connected to the rear part of the front body 2 thus configured such that the ends are fitted to each other, and the upper body part 2a, the middle body part 2b, and the lower body part 2
c is configured so that it can be independently swung in the horizontal direction with respect to the rear trunk 1 by a plurality of middle folding jacks 3. The cutter head 4 is provided on each of the upper body part 2a, the middle body part 2b, and the lower body part 2c, and the cutter heads 4 can be driven to rotate so as not to interfere with each other.

The prior art shield machine allows such a structure to excavate an underground pit having a non-circular cross section. And especially, the front trunk 2 is
a, 2b, and 2c so that each of the body parts 2a, 2b, and 2c can be independently swung in the horizontal direction.
By adjusting the swing direction and the swing amount of c, it is possible to excavate while swinging in various modes.

[0007] The shield machine according to the prior art can perform such operations. Therefore, when the vehicle is rolled around the bottom as shown in FIG.
a and the middle body part 2b are swung in the direction opposite to the rolling direction (left side in FIG. 8) so that the swing amount of the former becomes relatively large, and the lower body part 2c is not swung. And proceed with the excavation. Then, the shield excavator corrects the excavation direction separately while the upper and middle fuselage portions 2a and 2b take a reaction force on the ground, and gradually turns around the bottom in the direction opposite to the rolling direction in the excavation process. You can move and make rolling corrections to eliminate rolling.

Further, as shown in FIG. 9, when rolling is performed by rotating about the center portion, the upper body portion 2a and the lower body portion 2c are moved in the direction opposite to the rolling direction (the body portion 2a is not shown in the drawing). 9 and the torso portion 2c (right side in FIG. 9) by the same amount.
The excavation proceeds without causing b to swing. Then, the shield machine can be moved to the upper and lower fuselage portions 2a, 2a
c corrects the excavation direction in the opposite direction while taking a reaction force on the ground, and in the excavation process, gradually rotates around the central portion in the direction opposite to the rolling direction to perform rolling correction. When the direction is corrected by adjusting the swing amounts of the body portions 2a, 2b, and 2c of each stage in this manner, the excess digging amount of each stage is appropriately adjusted according to the swing amount so that the direction can be corrected smoothly. Excavation is performed with the copy cutter 5 while adjusting to a proper value.

[0009]

However, in the prior art described above, in order to be able to perform the rolling correction, the unstructured structure in which the front fuselage 2 of the shield machine is swingably divided into a plurality of stages. It is necessary to adopt a simple structure and to be able to individually swing each stage so that the cutter head 5 does not interfere with others. Therefore, a very complicated mechanism is required for the rolling correction, and the cost required for the rolling correction is extremely high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and its technical problem is to provide a shield excavator capable of performing a rolling correction without a complicated rolling correction mechanism. To provide a shield method.

[0011]

Means for Solving the Problems In order to achieve the technical object of the present invention, the invention of the shield machine described in this application employs the following means 1). The following means 2) was employed.

1) A cutter head for excavating the ground, a front body which is integrally formed as a whole and has a cutter head at a front part, and is connected to the rear part of the front body such that the ends are fitted to each other. And a rear fuselage having an assembly space for the segments therein, and in a shield machine for excavating an underground pit having a non-circular cross section, twisting the front fuselage with respect to the rear trunk by changing the center point of torsion. The front torso is supported by the rear torso so as to be able to perform the same operation, and a gap is provided between the end portions of the mating front and the rear torsion so as to allow the twisting operation. A driving unit fixed to one of the trunk and the rear trunk and driving the front trunk to be twisted with respect to the rear trunk; and a transmission member fixed to the other of the front trunk and the rear trunk and transmitting the driving force of the driving unit. A plurality of sets of torsion mechanisms consisting of The center point of the torsion is changed by the retraction mechanism so that the front body can be twisted. 2) A cutter head for excavating the ground, a front body which is integrally formed as a whole and has a cutter head at a front part, and connected inside the rear part of the front body in such a manner that ends are fitted to each other. In the shield construction method using a shield excavator that excavates an underground pit having a non-circular cross-section with a rear trunk having a segment assembly space, at the time of rolling of the shield excavator, during the excavation process of the shield excavator, At an angle greater than the amount of rolling, in the direction opposite to the direction of rolling,
The first step in which the front body is twisted back while taking the reaction force at the rear body, and the back body is twisted back in the direction opposite to the rolling direction while taking the reaction force with the twisted front body. And correcting the rolling of the shield excavator through a second step of correcting so as to eliminate the rolling of the rear trunk.

[0013] Since the invention of the shield machine described in this application is configured as described in the above 1), when rolling occurs in the shield machine, driving means of a plurality of sets of torsion mechanisms are driven, By transmitting the driving force to the front body via the transmission member, the front body is twisted back with respect to the rear body while supporting the front body with the rear body within the width of the gap between both ends. To correct the rolling of the shield machine. In that case, by appropriately adjusting the driving amount of the driving means in the plurality of sets of torsion mechanisms, the center point of the torsion and the amount of torsion are respectively set according to the position of the rotation center of the rolling and the amount of rolling. Since the front fuselage can be twisted with various changes, it is possible to accurately correct the rolling of the shield machine in a proper state.

[0014] The invention of the shield method of this application is configured as in the above 2), and when the rolling of the shield machine occurs, the first process is performed in the excavation process of the shield machine.
In the step and the second step, the front body and the rear body are forcibly twisted back in the direction opposite to the rolling direction, so that not only the front body but also the rear body for assembling the segments are quickly moved. Rolling can be corrected. Also, when correcting the rolling of the shield machine, in particular, in the first step, the front body is twisted back in the direction opposite to the rolling direction at an angle larger than the amount of rolling of the shield machine. In the second step, in the process of twisting back the rear body in the direction opposite to the rolling direction while taking a reaction force with the front body that has been twisted back, the front body compacts the ground and is in a normal state. Thus, it is possible to prevent a situation in which the rolling correction cannot be performed correctly due to the inclination in the rolling direction, and the front and rear trunks can be surely corrected for rolling regardless of the properties of the ground. The invention of the shield excavator and the shield construction method described above is different from the conventional technology when modifying the rolling of the shield excavator, in particular, by modifying the rolling by twisting back the front body integrally formed as a whole. Therefore, in any of the inventions, the rolling correction can be performed without a complicated rolling correction mechanism.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, how the invention of the shield machine of this application and the invention of the shield method of this application are actually embodied will be described with reference to FIGS. Embodiments of both these inventions will be clarified. FIG. 1 is a perspective view schematically showing an embodiment of the shield machine according to the present invention, FIG. 2 is a horizontal sectional view near the bottom of the shield machine of FIG. 1, FIG. 3 is a transverse sectional view of FIG. FIG. 5 is a cross-sectional view showing a state where the rolling of the first mode is corrected in the shield machine shown in FIG. 1, and FIG. 5 is a state showing a state where the rolling of the second mode is corrected in the shield machine shown in FIG. FIG. 1 to 5,
Parts denoted by the same reference numerals as those in FIGS. 6 to 9 represent parts equivalent to those in FIGS.

In FIGS. 1 to 5, reference numeral 1 denotes a rear body having a vertically-long rectangular cross section similar to that already described, and 2 denotes a rear body of this kind which is integrally formed with a cutter head 4 at the front. It is a front fuselage similar to the front fuselage in a normal shield machine,
Like the rear trunk 1, the cross section has a vertically long rectangular shape. The front body 2 is different from the above-described related art in that the front body 2 is integrally formed without being divided into a plurality of stages. The front body 2 is provided with a cutter head 4 having a built-in copy cutter 5 at an upper part, a center part, and a lower part, respectively.
These cutter heads 4 can be driven to rotate so as not to interfere with each other.

The rear end of the front body 2 and the front end of the rear body 1 are fitted and connected to each other, as in the prior art. A gap is formed between the ends, and this fitting gap is sealed with a flexible sealing member (not shown) so as to prevent intrusion of excavated earth and sand. If the front body 2 is not supported by the rear body 1, the front body 2 contacts the rear body 1 at the top or the bottom and cannot be held at these locations unless the front body 2 is supported by the rear body 1.
The front body 2 is supported by the rear body 1 via a support mechanism including a support bracket 9 described later. In the example shown here, the front torso 2 and the rear torso 1 are connected by a plurality of center bending jacks 3 so that the shield machine can be bent in the middle. It is not indispensable to the present invention, as is clear from the technical contents of the invention described in detail below.

When the rolling correction is performed in the shield machine shown in the figure, the front body 2 is reversed with respect to the rear body 1 in the rolling direction around the portion corresponding to the center of rotation of the rolling by using the fitting gap. In the direction (forced rotation). In order to perform such an operation, a torsion mechanism that includes a jack 6 described below, which is a mechanism for applying a twisting force to the front body 2, is provided. When rolling, the shield excavator rotates around the center of the cross section of the shield excavator body or pivots around the bottom, etc. , Depending on the surrounding conditions at that time. In order to accurately perform the rolling correction, the center point of the torsion is changed so as to correspond to the center of rotation of the individual rolling corresponding to each rolling generated in the excavation process, and the torsion of the front body 2 is changed. Although it is desirable to perform the operation, the torsion mechanism and the support mechanism are configured to perform such an operation in cooperation. In addition, front trunk 2 and rear trunk 1
In the case where the fitting gap is formed between the end portions, a gap that is slightly wider than the conventional technology that is sufficient to enable such a twisting operation is formed.

The torsion mechanism and the supporting mechanism are described in detail below. Reference numeral 6 denotes a jack as a driving means for driving the front body 2 to be twisted with respect to the rear body 1 while fixing the rear body 1. Reference numeral 7 denotes a mounting bracket for fixing the cylinder portion of the jack 6 to the rear body 1 in a fixed manner. Reference numeral 8 denotes a front end portion fixed to the front body 2 with a fixing bracket 10 to reduce the driving force of the jack 6 to the front body 2.
9 is a round bar as a transmission member for transmitting the front body 2 to the rear body 1
A support bracket that constitutes a support mechanism for causing the jack 6 to be inserted into and supported by the rear end of the round bar 8 and guided in the left-right direction. Similarly, it is fixedly attached to the rear trunk 1.

A pair of mounting brackets 7 project from the bottom of the rear body 1 and are arranged symmetrically with respect to the round bar 8. The jacks 6 are attached one by one to each of the mounting brackets 7, and are arranged on the left and right sides so as to sandwich the center of the round bar 8. One jack 6 is extended and the other jack 6 is contracted, so that the round bar 8 is contracted. Can be moved left and right. In this way, when the pair of jacks 6 are expanded and contracted, the round bar 8 moves to the left and right, so that the force of the jack 6 is transmitted to the front body 2 via the round bar 8 and the front body 2 is twisted. The support bracket 9 functions to guide the round bar 8 through the elongated hole 9a when the round bar 8 moves to the left and right in this manner.
Is supported on the rear trunk 1 via the round bar 8. Therefore, in the example shown here, the torsion mechanism for applying the torsion force to the front body 2 is constituted by the pair of jacks 6 and the round bar 8, and the front body 2 is supported by the rear body 1. The support mechanism for this purpose includes a round bar 8 and a support bracket 9.

Although the drawing only shows a state in which such a torsion mechanism and a support mechanism are disposed on the bottom side of the shield machine, the torsion mechanism and the support mechanism are not provided in the shield machine. It is also provided in the same manner on the top side. Therefore, by expanding and contracting the pair of jacks 6 on one or both of the bottom and top support mechanisms, the front body 2 is tilted relative to the rear body 1 in the left-right direction within the width of the fitting gap therebetween. Can be twisted. When the front body 2 is twisted with respect to the rear body 1 to perform the rolling correction, the torsion mechanisms are disposed on the bottom side and the top side, respectively. By appropriately adjusting the amount of expansion and contraction of the jack 6 in the side and top side torsion mechanisms, the torsional center point and the amount of torsion are variously changed according to the position of the rolling rotation center and the amount of rolling. Then, the front body 2 can be twisted. In this case, while being supported by the elongated hole 9a of the support bracket 9, the round bar 8 moves right and left following various arc-shaped trajectories according to the center point of the torsion. The long hole 9a is provided with a round bar 8 having various arc-shaped trajectories.
Is formed so as not to hinder the movement of the
Since it is a gentle curve that is almost straight, the long hole 9a
May be formed so as to form a linear groove slightly wider than the diameter of the round bar 8.

Next, a shield construction method for performing rolling correction using a shield machine having such a structure will be described with reference to FIG.
This will be described with reference to FIG. The following description describes a state when the front of the rear trunk 1 is viewed from the rear. First, the unique method created by the present invention will be described. When the front trunk 2 and the rear trunk 1 are rotated clockwise around the bottom as shown by the solid line in FIG. In order to smoothly carry out a first step described below in which the front body 2 is twisted back in the direction opposite to the rolling direction, the ground on the side opposite to the rolling direction (left side in FIG. 4) is set near the bottom of the front body 2. Except for the above, the dug ground is loosened by excavation with the copy cutter 5. Such excavation is appropriately performed as necessary even in the process of performing the first step. However,
In the shield excavator, an underground pit having a diameter larger than the outer diameter of the shield excavator main body is excavated by the cutter head 4, so that a small amount of excavation has already been performed. When the angle (inclination from the normal state) is small, it is not necessary to perform such excavation.

Next, as a first step, during the excavation process of the shield excavator, the right jack 6 on the top side is extended and the left jack is extended while the pair of jacks 6 on the bottom side are not expanded and contracted (maintained at a neutral position). By shrinking 6, while hitting the right side of the rear body 1 against the ground,
Previous to the rear cylinder 1 to cylinder 2, as shown by the chain line in FIG. 4, return torsion forces only large angle theta ₂ than rolling amount theta ₁ in the rolling direction and the reverse direction. In this case, the jack 6 on the bottom side is not expanded and contracted, so that the front body 2 uses the bottom of the shield excavator main body, which is the center of rotation of rolling, as the center point of torsion, and the round bar 8 and the support bracket 9 It is torsioned back while being supported by the rear trunk 1. During this time, the shield excavator is excavating, and in the excavation process, an underground shaft slightly inclined to the left is gradually excavated by the front body 2.

Then, as a second step, during the excavation process of the shield excavator, the left jack 6 on the top side is extended and the right jack 6 is contracted, so that the front body of the underground pit is tilted to the left. 2 while applying a reaction force to the right side of the rear body 2, the rear body 1 is forcibly twisted back by the same angle as the rolling amount θ _{1 in the} direction opposite to the rolling direction, and
To eliminate rolling. On the other hand, the front fuselage 2, which has been twisted back more than the amount of rolling in the direction opposite to the rolling, has a gap corresponding to the gap between the shield machine and the underground pit when the right side is applied to the ground to take a reaction force. It is tilted to the right around the center point of the torsion, and then further tilted to the right while consolidating the right ground, and twisted in the rolling direction. As a result, if the front trunk 2 is returned to the normal state in which it is not inclined in any of the left and right directions, the rolling correction process is terminated. If it has not been returned to the normal state, the ground is loosened by performing extra excavation by the copy cutter 5, and then the front body 2 is continuously twisted in the rolling direction to return to the normal state.

When the front body 2 is twisted back in the direction opposite to the rolling direction in the first step, the front body 2 is rolled by a rolling amount θ _1.
Theoretically, the most efficient method is to twist back by the same angle as above and directly return to the normal state. However, when such a method is employed, in the second step, when the rear body 1 is twisted back in the direction opposite to the rolling direction to correct the rolling, the right side of the front body 2 is brought into contact with the ground to obtain a reaction force. Since the ground is not hard, the front fuselage 2 consolidates the ground on the right side and tilts to the right side from the normal state, and it is necessary to repeatedly perform rolling correction until returning to the normal state. For these reasons, in the first step, as described above, before and then returned twisting the body 2 by a large angle theta ₂ than rolling amount theta _1, thereby, the front torso 2 and the rear cylinder 1 Rolling correction can always be performed reliably regardless of the properties of the ground.

In the above example, the operation of untwisting the rolling of the front trunk 2 and the rear trunk 1 is performed during the excavation of the shield excavator, but may be performed while the shield excavator is stopped.

When the front trunk 2 and the rear trunk 1 are rotated about the center and rolled clockwise as shown by the solid line in FIG. 5, as a preliminary step, the ground in the central region of the front trunk 2 is Without excavation, the ground in the upper region and the ground in the lower region are on the opposite sides to the rolling direction, respectively (the left in FIG. 5 for the ground in the upper region, and the right in FIG. 5 for the ground in the lower region. ) Is dug by the copy cutter 5 to loosen the excavated ground. As in the example of FIG. 4, such excavation is appropriately performed as necessary even in the process of performing the first step, and need not be performed when the rolling amount is small.

Next, as a first step, during the excavation process of the shield machine, the right jack 6 on the top side is extended and the left jack 6 is contracted, while the left jack on the bottom side is equal to the amount of expansion and contraction thereof. 6 and contracting the right jack 6, the right side of the rear body 1 is brought into contact with the ground to take a reaction force, and the front body 2 is moved against the rear body 1 in the rolling direction as shown by a chain line in FIG. 5. Forcibly twist back in the reverse direction by an angle θ ₄ larger than the rolling amount θ ₃ . As a result, the front trunk 2 is twisted back while being supported by the rear trunk 1 with the central portion, which is the center of rotation of the rolling, as the center of torsion. Then, as a second step, during the excavation of the shield machine, the jacks 6 on the top and bottom sides are expanded and contracted in the opposite direction to the first step, thereby twisting the central part of the shield machine body. in the Rino center point, the rear cylinder 1 returns torsional only force the same angle as the rolling amount theta ₃ rolling direction opposite, thereafter, the rolling of the shield machine by a method according to the example of FIG. 4 Fix it.

In the case of performing the rolling correction, if the rolling correction is performed when the rolling amount is very small, the amount of the correction is small and there is no need for extra excavation, so that the rolling correction can be performed efficiently. As described above, examples in which the invention of the shield machine and the invention of the shield method of this application are actually embodied have been described.However, these examples are different from the prior art when the rolling of the shield machine is corrected. In contrast, since the rolling is corrected by untwisting the front body 2, which is integrally formed as a whole, the rolling can be corrected without a complicated rolling correcting mechanism.

In a shield machine for excavating an underground pit having a non-circular cross section, the center of rotation of the rolling is not always located at the center of the shield machine, and the degree of dispersion in various parts is circular cross section. It's more expensive than a shield machine, making it harder to fix the rolling correctly all the time. However, in the shield machine shown in the figure, since the torsion mechanism is disposed on the bottom side and the top side of the shield machine, respectively, as apparent from the description with reference to FIGS. Attempting to twist the front body 2 by freely changing the center point of torsion and the amount of torsion by appropriately adjusting the amount of expansion and contraction of the jack 6 in each of the two torsion mechanisms. Can be.
Therefore, even if the position of the center of rotation of the rolling and the amount of rolling change due to the peripheral conditions at the time of excavation, not only the amount of twist is appropriately adjusted according to the rolling mode at each time, but also the rotation of the rolling is changed. The center point of the torsion can also be changed to match the center, so that the rolling correction can always be performed accurately. For example, as shown in FIG. 4, when the shield machine rolls around the bottom as the center of rotation, even if the center axis of the shield machine is shifted by d from the original position, the shield machine is the center of rotation of the rolling. Since the front portion 2 can be untwisted with the bottom portion as the center of torsion, the center axis of the shield machine is not displaced from the original position when the rolling is corrected.

In the example shown here, one set of the torsion mechanism is provided at the top and the bottom of the shield machine.
Such an effect can be exerted by providing one set of the torsion mechanism in another portion or by providing a plurality of sets by providing up and down and left and right. be able to. When the torsion mechanism is provided at a position different from the top and the bottom, a support mechanism including the round bar 8 and the support bracket 9 is separately prepared and provided at the top and the bottom of the shield machine. The mechanism may be independent of the torsion mechanism. However, when the torsion mechanism is disposed at the top and bottom of the shield machine, a large torsional moment can be applied to the front body 2, so that the capacity of the jack 6 of the torsion mechanism is reduced. It can be made relatively small, and the space inside the shield machine body is not narrowed more than necessary. Each torsion mechanism is provided with a pair of jacks 6 so that one round bar 8 is moved left and right by a pair of jacks 6. However, a plurality of pairs are provided and one round bar 8 is provided. May be moved left and right in cooperation with a plurality of pairs of jacks 6. Also,
One jack 6 is provided for each torsion mechanism, and each jack 6 is flexibly connected to the round bar 8.
By expanding and contracting, one round bar 8 may be moved left and right by one jack 6.

In the shield excavator shown here, the front trunk 2 and the rear trunk 1 are connected by a plurality of bent jacks 3 and the shield 9 is provided with the portion where the round bar 8 is inserted into the long hole 9a of the bracket 9 as a support point. The excavator body can be bent in the middle.
In this case, the rear end of the round bar 8 is shaped like a shell so as to be able to bend smoothly in any direction such as up, down, left, right, and the middle direction. When the main body can be bent in the horizontal direction, the rear end of the round bar 8 does not necessarily have to have such a shape. When the support mechanism for correcting rolling composed of the round bar 8 and the support bracket 9 is used as a support mechanism for bending the shield machine in the middle, the center of gravity of the front body 2 is set to the middle position during the middle bending operation. There is a problem that the front body 2 is easily rolled in the middle bending direction by shifting to the folding direction, but even in such a case, the front body 2 is jacked against the front body 2 by a jack 6 so as to prevent the rolling. Adding a small amount of twist in the direction in advance will prevent such problems.

As described above, in the shield machine, the support mechanism for correcting the rolling is also used as the support mechanism for folding the shield machine in the horizontal direction. Can be used for various operations of the shield machine, and a rational design is adopted. Conventionally, when the shield machine is manufactured so that it can be folded in the middle, a predetermined portion between the ends of the front body 2 and the rear body 1 is fixedly pivoted with a center pin or a center bending jack to be bent. In order to prevent the ends of the front body 2 and the rear body 1 from interfering with each other at the time of folding, the opposed surfaces of the ends were precisely curved. The work of performing a precise spherical processing on a surface is a difficult work requiring labor and skill. On the other hand, in the shield machine, a sufficient gap is provided between the ends of the front body 2 and the rear body 1 and both ends are fixedly connected to each other via the long hole of the bracket 9 and the round bar 8. Therefore, it is not necessary to perform a precise curved surface processing on the facing surfaces of the end portions of the front body 2 and the rear body 1 as in the related art, so that the processing steps can be simplified and the production efficiency can be improved. Can be achieved.

As described above, with respect to the invention of the shield machine,
Although an example is shown in which this is embodied in a shield machine having a vertically long rectangular cross section, it can also be naturally embodied in a shield machine having a horizontally long cross section. In this case, the jack 6, the round bar 8, the support The brackets 9 and the like are desirably disposed symmetrically with respect to the center axis of the shield machine. When the jack 6, the round bar 8, the support bracket 9, and the like are arranged as described above, the pair of jacks 6 on the rear trunk 1 side are provided up and down so as to sandwich the round bar 8. In order to support the front trunk 2 through the support, the role of the support mechanism is to be fulfilled by the jack 6 and the round bar 8, and the support bracket 9
Serve as a mere guide.

Although FIG. 2 shows only an example in which the jack 6 and the support bracket 9 are attached to the rear body 1 and the round bar 8 is attached to the front body 2, the jack 6 and the support bracket 9 are not shown.
May be attached to the front trunk 2 side, and the round bar 8 may be attached to the rear trunk 1 side.

[0036]

As is apparent from the above description, the invention of the shield machine and the invention of the shield method of this application are as follows.
1) and 2) in “Means to solve the problem”, respectively.
Therefore, according to these inventions, it is possible to obtain a shield excavator and a shield construction method capable of performing rolling correction without requiring a complicated rolling correction mechanism. In the invention of the shield machine described in this application, a plurality of torsion mechanisms are arranged in the shield machine, and the center of the torsion is changed so that the front body can be twisted. Therefore, the center point of the torsion can be changed so as to match the center of rotation of the rolling according to the rolling mode at that time, so that the rolling correction can always be performed accurately. In the invention of the shield method according to this application, in particular, in the first step, the front body is twisted back in the direction opposite to the rolling direction at an angle larger than the rolling amount, so that when the rolling of the shield excavator occurs, In addition, it is possible to reliably correct the rolling of both the front and rear bodies regardless of the properties of the ground.

When the invention of the shield machine according to the present application is embodied, particularly when embodied as described in claim 2, the above-mentioned effects relating to the invention of the shield machine can be obtained. When the front body is twisted with respect to the rear body by the torsion mechanism, a relatively large moment can be applied, and the capacity of the driving means in the torsion mechanism can be relatively reduced. Also, the space inside the shield machine is not reduced more than necessary. In this case, particularly when embodied as claimed in claim 3, the transmission member and the support member provided for correcting the rolling of the shield machine can be disposed horizontally in the shield machine body. The same member can be used for a variety of operations of the shield machine, because the same member can be used also as a support mechanism when it is broken. Also, when the shield machine can be bent in this way, it is not necessary to subject the inner surfaces of the end portions of the fitted front and rear bodies to a precise curved surface processing as in the past, The processing steps can be simplified, and the production efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an embodiment of a shield machine according to the present invention.

FIG. 2 is a horizontal sectional view of the vicinity of a bottom of the shield machine shown in FIG. 1;

FIG. 3 is a cross-sectional view of FIG.

FIG. 4 is a cross-sectional view showing a state where the rolling of the first embodiment is corrected in the shield machine shown in FIG. 1;

FIG. 5 is a cross-sectional view showing a state where the rolling of the second mode is corrected in the shield machine shown in FIG. 1;

FIG. 6 is a perspective view schematically showing a shield machine according to the related art.

FIG. 7 is a horizontal sectional view of the vicinity of the bottom of the shield machine shown in FIG. 6;

FIG. 8 is a cross-sectional view showing a state where the rolling of the first aspect is corrected in the shield machine according to the related art.

FIG. 9 is a cross-sectional view showing a state where the rolling of the second mode is corrected in the shield machine according to the related art.

[EXPLANATION OF SYMBOLS] 1 after cylinder 2 before bending in barrel 3 jacks 4 cutter head 5 copies cutter 6 jack 7 mounting bracket 8 the round bar 9 support brackets 9a slot 10 fixing bracket theta _1, theta ₃ rolling amount

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Norio Kondo, Inventor 1-24-4, Shinkawa, Chuo-ku, Tokyo Inside Daitoyo Construction Co., Ltd. (72) Katsumi Tamura 650, Kandamachi, Tsuchiura-shi, Ibaraki Prefecture Hitachi Construction Machinery Co., Ltd. F-term in Tsuchiura Factory (reference) 2D054 AA02 AB05 AD02

Claims (4)

[Claims] 1. A cutter head for excavating a ground, a front body which is integrally formed as a whole and provided with a cutter head at a front part,
A shield excavator for excavating an underground pit having a non-circular cross-section, comprising a rear fuselage connected to fit the ends of the front fuselage with each other and having an assembly space for a segment therein, The front body is supported by the rear body so that the torsion operation can be performed by changing the center point of the torsion with respect to the rear body, and the front body and the back body are fitted between the mating front and rear ends. A drive means for fixing a gap to one of the front body and the rear body and driving the front body to be twisted with respect to the rear body, a front body and the rear A plurality of torsion mechanisms, each of which is fixed to the other side of the trunk and is composed of a transmission member for transmitting the driving force of the driving means, are provided in the body of the shield machine, and the plurality of torsion mechanisms are used. A shield excavator characterized by changing the center point of the bridge so that the front body can be twisted. 2. The shield machine according to claim 1, wherein when a plurality of torsion mechanisms are provided in the shield machine, the torsion mechanisms are provided at an upper portion and a lower portion of the shield machine. In addition, when the front trunk is supported by the rear trunk, a support member provided with a long hole for guiding the transmission member is attached to one of the front trunk and the rear trunk, and the other of the front trunk and the rear trunk is attached to the long hole. A shield excavator characterized in that a transmission member fixed to the shield excavator is inserted so as to be supported at an upper portion and a lower portion. 3. A front body and a rear body having a plurality of middle-bent jacks so that the shield machine body can be bent at least in the horizontal direction with the insertion point of the transmission member in the elongated hole of the support member as a support point. The shield machine according to claim 2, wherein the shield machine is configured to be connected with each other. 4. A cutter head for excavating the ground, a front body integrally formed as a whole and provided with a cutter head at a front portion,
A shield method using a shield excavator for excavating an underground pit having a non-circular cross-section, comprising a rear fuselage connected to the rear portion of the front fuselage so that the ends thereof are fitted to each other and having an assembly space for segments therein. At the time of rolling of the shield excavator, during the excavation of the shield excavator, twist the front torso while taking a reaction force with the rear trunk at an angle larger than the amount of rolling in the direction opposite to the rolling direction. A first step of returning, and a second step of twisting the rear body back in the direction opposite to the rolling direction while taking a reaction force with the front body that has been twisted back, so as to eliminate the rear body rolling. A shield method characterized by correcting the rolling of the shield machine through a process.