JPH0649593U - Simultaneous propulsion assembly type shield excavator - Google Patents

Abstract

(57) [Summary] [Purpose] A shield excavator that does not have a large groove that would hinder propulsion and is formed on the outer peripheral portion of the shield to allow smooth simultaneous propulsion and assembly. [Structure] The shield body is composed of at least the front body part and the rear body part, and a middle folding mechanism is provided at the connection part between them, and a slide hood with a cutter head attached to the front end part can slide in the front body part. In addition, the slide hood can be excavated by a propulsion jack and the segment pieces can be simultaneously assembled in the rear trunk.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a simultaneous propulsion assembly type shield excavator capable of performing excavation propulsion and segment assembly at the same time.

[0002]

[Prior art]

 In general, the shield excavator uses the tip surface of an existing segment as a propulsion bearing surface to propel the shield body with a propulsion jack, and excavates with a cutter head provided at the tip of the excavator. Therefore, when connecting a segment ring to an existing segment, it is necessary to form a gap for one ring at the tip of the existing segment by excavation propulsion, and therefore excavation propulsion and segment assembly cannot be established at the same time. There was no choice but to repeat the construction.

Under the circumstances, a simultaneous propulsion type shield excavator as disclosed in Japanese Patent Application Laid-Open No. 2-161093 has been proposed in order to simultaneously perform excavation propulsion and segment assembly. As shown in FIG. 2, the shield body is formed by a front body portion 1 and a rear body portion 2, and especially at the front end of the rear body portion 2 at the connecting portion of the two, the inside of the rear opening of the front body portion 1 is formed. It has a telescopic structure provided with a closing hood 3 which is inserted into the. Then, the front torso 1 is independently excavated and propelled along the closed hood 3 of the front torso, and the rear torso 2 is intermittently advanced to form the assembly gaps of the segments for assembly. .

[0004]

[Problems to be solved by the device]

 However, in the conventional co-propelled assembling type excavator, the circumferential groove 4 is formed and exposed between the rear edge of the front body portion and the front edge of the rear body portion, and the ground flows into the groove 4. As a result, they were compacted, which hindered the promotion and adversely affected the soil quality. In particular, this groove has a relatively deep depth, and the width dimension is variable due to the expansion and contraction operation of the shield body, and the compaction due to the trapping of sand and sand is increased, which has a serious adverse effect.

The present invention focuses on the above-mentioned conventional problems, and provides a simultaneous propulsion assembly type shield excavator which is capable of smooth simultaneous propulsion without a large groove that may impede propulsion. With the goal.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the simultaneous propulsion assembly type shield excavator according to the present invention is configured such that the shield body is composed of at least a front body portion and a rear body portion, and a middle folding mechanism is provided at a connecting portion between the both. A slide hood with a cutter head attached to the front end can be slidably installed in the front trunk, and the slide hood can be excavated by a propulsion jack while simultaneously assembling segment pieces in the rear trunk. Of.

[0007]

[Action]

 According to the above configuration, the front body and the rear body are connected via the center folding mechanism, and the cutter head is driven by the slide hood that slides in the front body. It is sufficient to form only the gap between the body and the body so that it can be folded. The excavation by the cutter head is performed by pushing the slide hood that slides in the front trunk forward from the existing segment as the starting point, and further pulling in the rear trunk side from the forward slide hood as the starting point. By doing so, the rear trunk moves forward together with the front trunk. As a result, it suffices to form a gap that can be bent in the middle between the front body portion and the rear body portion, and a large groove is not formed. A slide gap is formed between the cutter head and the front body, but this is just after excavation and has a depth equivalent to the thickness of the skin plate, so there is no substantial effect.

[0008]

【Example】

 Hereinafter, a specific embodiment of the simultaneous propulsion assembly type shield excavator according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional configuration diagram of a simultaneous propulsion assembly type shield excavator according to an embodiment. As shown in this figure, in the shield excavator, the shield body 10 is composed of a front body portion 10F and a rear body portion 10R, and a cutter head 12 is arranged at the tip portion of the shield body 10. In the excavator according to the embodiment, the cutter head 12 is configured to be attached to a slide hood 14 that is inserted in the front body portion 10F and slides in a telescopic manner so as to be able to move in and out. By extruding the hood 14 from the shield body front body portion 10F, only the cutter head 12 is independently projected to enable excavation.

A bulkhead 16 is provided inside the slide hood 14 to partition the inside of the shield into front and rear parts. The bulkhead 16 rotatably supports the cutter head 12 and a motor 18 attached to the rear surface. The cutter head 12 is driven to rotate for excavation.

The cutter head 12 rotates to perform an excavation action, and an excavation jack 20 that connects the front body portion 10F and the slide hood 14 to advance the excavation is provided. As a result, the slide hood 14 is driven to project from the front body portion 10F, and the cutter head 12 can be excavated and propelled. That is, the excavation jack 20 has a front end connected to the bulkhead 16 and a rear end connected to a bracket 22 attached to the inner rear surface of the front body portion 10F so as not to interfere with the slide hood 14, so that the extension operation is performed. When this is done, the slide hood 14 is moved forward from the front body portion 10F, and the cutter head 12 attached to the slide hood 14 is driven forward.

A shield propulsion jack 24 is provided for advancing the entire shield body 10. In order to attach the propulsion jack 24, an extension hood 26 having a smaller diameter than the slide hood 14 and inserted into the front body portion 10F is provided at the front end portion of the rear body portion 10R. Then, the reinforcing plate 28 is integrally attached radially to the outer peripheral surface of the extension hood 26, and the tip end of the reinforcing plate 28 can be brought into contact with the bulkhead 16 of the slide hood 14. The propulsion jack 24 is arranged between the reinforcing plates 28, the front end is connected to the front part of the reinforcing plate 28, and the rear end is extended to the rear body part 10R side to attach the jack spreader to the front end face of the segment 30. Face to face. As a result, by extending the propulsion jack 24, the rear body portion 10R advances with the segment 30 as a supporting surface, and at the same time, the front body portion 10F and the cutter head 12 advance via the bulkhead 16.

In such a shield excavator, a center bending mechanism that bends the front body portion 10F with respect to the center line of the rear body portion 10R is provided. That is, the joint outer 32A formed in a ring shape along the inner peripheral surface of the rear end portion of the shield body front body portion 10F is fixed, while the reinforcing plate 28 attached to the extension hood 26 in the rear body portion 10R has the above-mentioned joint. The joint inner 32B that makes face-to-face contact with the outer 32A is fixed. The joint outer 32A and the joint inner 32B form a spherical joint 32, and the joint surface is set so as to form a part of a spherical surface having a radius R centered on the point O on the shield center line C. In this embodiment, the center O is set at a position closer to the rear trunk portion 10R than the center of the width dimension of the spherical joint 32, so that more propulsive force transmitting surfaces are formed. By such a spherical joint 32, the front body portion 10F can be bent in the middle with respect to the rear body portion 10R, and the excavation direction can be changed. The height of the reinforcing plate 28 is gradually reduced toward the tip so that the reinforcing plate 28 does not interfere with the slide hood 14 when the center plate is bent.

A center-folding jack 34 is attached to drive the center-folding. The extension-extending drive is performed in the radial direction of the shield body 10, specifically, in the radial direction of the extension hood 26 of the rear body portion 10R. It is arranged so that it becomes the direction. That is, jack mounting brackets 36 are provided at four positions on the outer peripheral surface of the extension hood 26, which are located in front of the spherical joint 32, and the middle folding jacks 34 are arranged along the shield radial direction. While being attached through the trunnion shaft 38. The rod 40 of the jack 34 is connected to a connecting bracket 42 provided on the inner surface of the front body portion 10F. The trunnion shaft 38 is set so as to be parallel to the shield center line C, so that the jack 34 allows the front body portion 10F to slightly rotate relative to the rear body portion 10R.

A gap is formed at the joint between the front body portion 10F and the rear body portion 10R so that the front body portion 10F and the rear body portion 10R can be bent by bending, and this portion is covered with an elastic cover 44 to prevent the inflow of earth and sand. ing.

Curve excavation by the center bending apparatus configured as described above is as follows. When the excavation jack 20 is moved forward while rotating the cutter head 12, the slide hood 14 projects from the inside of the front body portion 10F together with the cutter head 12, and the earth and sand is taken into the chamber inside the slide hood 14. Next, when the propulsion jack 24 is extended and driven, the rear body portion 10R advances with the segment 30 as a bearing surface, and the front body portion 10F advances integrally with this. During such excavation, the upper and lower or left and right middle folding jacks 34 are simultaneously operated to contract the inner side in the bending direction and extend the outer side, whereby the front body portion 10F slides and rotates on the spherical joint 32. , And the cutter head 12 is broken. This rotation center is the shield center C. At this time, the other pair of center-folded jacks 34 rotate about the trunnion shaft 38, and do not hinder the curve excavation. Of course, depending on the direction of the curve, it is also possible to simultaneously operate the four middle-folded jacks 34.

According to such an embodiment, the slide hood 14 is slidably advanced in the front body portion 10F by the extension driving operation of the jack 20 for excavation and the excavation by the cutter head 12 is performed, so that a certain amount of excavation is performed. At the time of completion, the rear body portion 10R is moved forward by extending and driving the propulsion jack 24, and accordingly, the front body portion 10F is pushed forward and moved. By advancing the shield body 10, a space for one ring is formed in the front part of the segment 30, and the segment is assembled by an erector device (not shown). During this assembling work, the cutter head 12 can be excavated in the same manner as described above, and thereafter, simultaneous propulsion and assembling can be performed by repeated operations. In this embodiment, the cutter head 12 is slidably moved with respect to the front body portion 10F, and the shield main body 10 is propelled following this, so that there is a gap between the front body portion 10F and the rear body portion 10R. Is sufficient for a middle break, and therefore this gap can be covered with the expansion cover 44, and the sediment is prevented from flowing into this gap, which prevents excavation obstacles and adverse effects due to compaction of the sand. be able to.

[0018]

[Effect of device]

 As described above, according to the present invention, the shield body is composed of at least the front body portion and the rear body portion, the center folding mechanism is provided at the connection portion between the both, and the cutter hood is attached to the front end portion. Since the slide hood is slidable in the front torso part, and the slide hood is driven and excavated by the propulsion jack, the segment pieces can be simultaneously assembled in the rear torso part, which is a major obstacle to propulsion. The recessed groove is not formed in the outer peripheral portion of the shield, and the excellent effect that a smooth simultaneous propulsion assembly method can be realized is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a simultaneous propulsion assembly type shield excavator according to an embodiment.

FIG. 2 is a cross-sectional view and a cross-sectional view of a main part of a conventional simultaneous propulsion assembly type shield excavator.

[Explanation of symbols]

 10 Shield Main Body 10F Front Body 10R Rear Body 12 Cutter Head 14 Slide Hood 16 Bulkhead 18 Cutter Head Drive Motor 20 Excavation Jack 22 Jack Mounting Bracket 24 Shield Propulsion Jack 26 Extension Hood 28 Reinforcement Plate 30 Segment 32 Spherical Joint 34 Medium Folded jack 36 Jack mounting bracket 38 Trunnion shaft 40 Jack rod 42 Connecting bracket 44 Expansion cover

Claims (1)

[Scope of utility model registration request] 1. A shield main body is composed of at least a front body portion and a rear body portion, and a middle folding mechanism is provided at a connecting portion between them, and a slide hood having a cutter head attached to a front end portion is slidable in the front body portion. A simultaneous excavation assembly type shield excavator characterized in that it is movably provided, and at the same time, the slide hood can be excavated by a propulsion jack while simultaneously assembling segment pieces in the rear trunk.