JP2784017B2 - Shield machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shield excavator used in a shield method, and more particularly, to a shield excavator capable of performing high-speed excavation and curving excavation by bending inside.

[Conventional technology] The shield method is used to excavate tunnels, especially in soft soils, by excavating a shield frame slightly larger than the outer diameter of the tunnel in the soil that is about to collapse or flow, and using a cutter to cut the front face of the front face. While inserting
This is a construction method in which excavation work and lining work are performed safely while preventing collapse inside, and a tunnel is easily constructed in soft soil.

The conventional shield excavator performs the excavation by taking the cutter and the shield frame forward by extending the shield jack by taking a reaction force on the segment assembled in the shield frame, and excavating by one ring of the segment. The shield jack is reduced, and a new segment is loaded behind the shield jack for assembly.

However, the conventional shield machine described above has a problem that the excavation speed is not improved due to intermittent excavation and the construction period is extended.

To solve these problems, Japanese Patent Application No. 57-9498
No. 9 (Japanese Patent Application Laid-Open No. 58-213993) has proposed a shield machine capable of simultaneously assembling and excavating segments to enable continuous excavation.

In this shield machine, as shown in FIG. 4, the shield frame is divided into a front frame b having a cutter a and a rear frame e having an erector d for assembling a segment c. The front part of the rear frame e is slidably inserted into the rear part of the inside to form the overlapping part f. The overlapping part f is formed along the inner peripheral surfaces of the front frame b and the rear frame e with the propulsion jack g, respectively. A plurality of force receiving jacks h are arranged with their operation directions directed in the frame axis direction. This arrangement is configured so that exactly the same number is alternately arranged on concentric circles, so that the space at the center can be effectively used.

The propulsion jack g is fixedly mounted on an annular mounting plate i having a push-side end integrally protruding from the inner periphery of the front frame b, and a rod j at the pull-side end is integrally formed on the inner periphery of the rear frame e. It is provided so as to be in contact with the projecting contact plate k, takes a reaction force to the corresponding contact plate, that is, the rear frame e, pushes out the front frame b from the overlapping portion f, and pushes the front surface toward the face. I have.

The reaction force receiving jack h has a pushing side end at the rear frame e.
So that the rod m at the pull-side end abuts on the ring-shaped segment c assembled in the rear end of the rear frame e. A reaction force is applied to the segment c to draw the rear frame e toward the front frame b so that the rear frame e is deeply overlapped. In the figure, h is a guide projection.

In excavation, the reaction force of the cutting face load is taken by the propulsion jack g and the reaction force receiving jack h, and the reaction force receiving jack h
Is assembled, a new segment c is assembled, the assembly of the new segment c is continued while the reaction force receiving jack h is replaced, and at the same time, the front frame b is dug into the face by the propulsion jack g. At the same time as the assembly of one ring is completed, the excavation of the propulsion jack g completes the excavation of the face of the front frame b for the length of one ring of the segment. Subsequently, while the face reaction force is maintained by the propulsion and reaction force receiving jacks g and h, the propulsion jack g is contracted and the reaction force receiving jack h is extended simultaneously to reset the front frame b to the face side. The above operation is repeated to perform continuous excavation.

[Problems to be Solved by the Invention] However, in the above continuous excavation type shield machine, the length L of the overlapping portion f between the front frame b and the rear frame e needs to be longer than the length of the segment c. In addition, the gap of the overlapping portion f is set to be small from the viewpoint of the arrangement of the internal equipment and the securing of the sealing property, and therefore,
Even if the traveling direction of the front frame b is changed by the jack for propulsion g in order to perform curve excavation in the shield excavator, the amount of change cannot be taken very little, and therefore, a straight line or a slight bend can be obtained. There is a problem that only tunnels that can be excavated can be excavated.

The present invention has been made by focusing on the above-described problems,
It is an object of the present invention to provide a shield excavator that enables continuous excavation and curved excavation by bending.

[Means for Solving the Problems] The present invention provides a front body frame having a cutter on the front surface, a middle body frame integrally having a front body guide tube fitted to the rear inside of the front body frame at the front part, A rear body frame having a front body integrally provided with a middle body guide tube having a curved surface for bending at the outside surface thereof, which is fitted to the inside of the rear part of the middle body frame, and attached to the rear body frame so as to take a reaction force to the segments; A first connector for connecting and disconnectably connecting the inner trunk guide tube to the middle trunk frame, and a second coupling for connecting the front trunk guide tube to the front trunk frame and detachably connecting the same. A shield excavator, comprising: a tool; and a jack for propelling and bending, which bendably connects between the front trunk frame and the rear trunk frame.

[Operation] When the straight excavation is performed, the middle body frame and the middle body guide cylinder are integrally connected by the first connector, and the second connector between the front body frame and the front body guide cylinder is separated. In the above, continuous excavation is performed by performing excavation work and segment assembling work in parallel by the expansion and contraction action of the jack for propelling and bending and the jack for receiving reaction force.

At the time of curve construction, in a state where the first connecting member between the middle body frame and the middle body guiding tube is cut off and the front body frame and the front body guiding tube are integrally connected by the second connecting member, the propulsion is performed.・
After giving the front body frame and the middle body frame a middle bending angle with the rear body frame using the center bending jack, the excavation by extending the reaction force jack and the assembly of the segment by reducing the reaction force receiving jack are performed. Go and perform curve construction by intermittent excavation work.

As mentioned above, the propulsion and
When the jack for middle bending and the first and second connecting tools are provided so that the jack for propulsion and center bending is used for both propulsion during continuous digging and for curve construction by middle bending, it is less necessary. With the number of jacks, and while keeping the length of the shield excavator short, it is possible to cope with both continuous excavation and curved construction.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a shield frame includes a front body frame 2 for supporting a cutter 1, a middle body frame 3 for folding, and a rear body frame 4 for assembling a segment 5. Into three parts. The middle body frame 3
Is overlapped on the outside of a middle length guide tube 7 of a required length protruding forward in the digging direction with respect to an annular jack mounting plate 6 protruding integrally with the inner periphery of the rear trunk frame 4 and bent inside. Polymerization section 8
Is formed.

Further, the front trunk frame 2 is provided outside a front copper guide cylinder 10 of a required length, which is protruded forward in the digging direction with respect to an annular connecting plate 9 integrally projecting from the inner periphery of the middle trunk frame 3. It is superposed to form a dug superposition section 11.

The middle body guide cylinder 7 has a middle bent surface 12 on its outer surface, and the middle body frame 3 can be displaced (center bent) along the middle bent surface 12 via the guide projection 13. I can do it. Further, a middle bend seal 14 is interposed between the cylinder 7 with the inner trunk guide and the inner trunk frame 3.

Further, the front end of the middle body guide tube 7 can be freely connected to and disconnected from the connecting plate 9 of the middle body frame 3 by a first connecting member 15 such as a pin or a bolt. The rear trunk frame 4 can be moved integrally or separately independently.

An excavation seal 16 is interposed between the front trunk guide tube 10 and the front trunk frame 2, and a front end of the front trunk guide tube 10 is connected to a second connecting member 17 such as a pin or a bolt (FIG. 3). ) Can be freely connected to and disconnected from the jack mounting plate 18 provided annularly inside the front body frame 2, whereby the front body frame 2 and the middle body frame 3 can be moved integrally or separately. To be able to move alone.

The jack mounting plate 18 of the front trunk frame 2 and the jack mounting plate 6 of the rear trunk frame 4 are connected to a jack for propulsion and bending.
19 allows it to bend freely via pins 20 and 21. The jack 19 for propulsion and bending is penetrated through the connecting plate 9 of the middle body frame 3 with a required margin.

The jack mounting plate 6 of the rear trunk frame 4 is provided with a reaction force receiving jack 23 which takes a reaction force through a shoe 22 on the front end face of the segment 5. The jacks 19 for propulsion and bending are alternately arranged on the same circumference. 24 shows a tail seal.

In the above description, the rear trunk frame 4 has a length capable of assembling the segment 5 therein, and the excavation overlap section 11 has a stroke capable of propelling by one ring assembly of the segment 5, and further has a center-folded overlap. The portion 8 has a length that can secure a required bending angle (see FIG. 3).

 Next, the operation will be described.

FIGS. 1 and 2 show a state during continuous excavation in which straight excavation is performed. At this time, the inner trunk guide tube 7 and the connecting plate 9 are connected by the first connecting member 15, and the inner trunk frame 3 and the rear The torso frame 4 is operated integrally, and the second connecting member 17 (FIG. 3) between the jack mounting plate 18 and the front torso guide tube 10 is separated from the front torso frame 2 and the middle torso. The frame 3 can be moved separately.

In the state shown in FIG. 1, the reaction force receiving jack 23 is extended to secure a space for assembling the segments 5 in the rear trunk frame 4. From this state, the propulsion / center bending jack 19 is extended to thereby increase the front trunk frame. 2 to advance and excavate. At the same time, a portion of the reaction force receiving jack 23 is reduced and a new segment 5 is attached to that portion, and after the assembly is completed, the reaction force receiving jack 23 is extended again to assemble the segment 5. Take the reaction force.

As shown in FIG. 2, when the jack 19 for propulsion and bending is extended by one ring of the segment 5, the jack 23 for receiving the reaction force is extended while the earth pressure in front of the cutter 1 is maintained, and the jack 19 is reduced. The operations are performed simultaneously to reset the initial state shown in FIG. By repeating this operation, the propulsion operation and the segment assembling operation can be performed in parallel to perform continuous excavation.

Next, when performing the curve construction, the first connecting member 15 is cut off to release the restraint of the middle trunk frame 3 and the rear trunk frame 4 so that they can be moved separately from each other. As shown, the front body guide tube 10 is connected to the jack mounting plate 18 by the second connecting member 17 so that the front body frame 2 and the middle body frame 3 move integrally.

As shown in FIG. 3, the outer propulsion / center bending jack 19 for performing the curve construction is extended, the inner side is contracted, and the reaction force is applied to the segment 5 in a state where the center bending angle is given in the center bending overlapping section 8. The excavation is performed by extending the reaction force receiving jack 23. In the above, the direction of the middle body frame 3 is changed along the middle bending surface 12 of the middle body guide tube 7, and the jack 19 for propulsion and middle bending can be freely bent by the pins 20 and 21. .

When the assembly space for the segments 5 is secured in the rear trunk frame 4 by the extension of the reaction force receiving jacks 23, the reaction force receiving jacks 23 are contracted, new segments 5 are assembled, and then the reaction force receiving jacks are again mounted. Extend 23 and excavate. Thereby, the curve construction is performed.

As described above, during curve construction, continuous excavation is not performed, but switching to intermittent excavation is performed.

According to the present invention, at the time of straight excavation, high-speed excavation work by continuous excavation is enabled, and the continuous excavation can be switched to intermittent excavation to perform curve construction.

In addition, in a double-body continuous excavation, a jack 19 for propulsion and bending is provided, and first and second connectors 15 and 17 are provided.
Since the jack 19 for propulsion and bending is used for both propulsion during continuous excavation and curve construction due to mid-bending, with a small number of jacks, while keeping the length of the shield excavator short, It can handle both continuous excavation and curve construction.

Incidentally, the shield machine of the present invention is not limited only to the above-described embodiment, the attachment and detachment of the coupling tool may be performed manually or automatically by providing a drive device, The connecting portion between the jack for propulsion and middle bending and the front and rear frames may use a bendable ball connection method other than the pin, etc., and various other changes may be made without departing from the gist of the present invention. Can of course be added.

[Effect of the Invention] As described above, according to the shield machine of the present invention, high-speed excavation work can be performed by continuous excavation during straight excavation, and free curving can be performed by performing intermittent excavation during curve construction. An excellent effect that enables construction can be obtained.

Further, in a double-hull type continuous excavation, a jack for propulsion / center bending and first and second connecting tools are provided, and the jack for propulsion / center bending is used for propulsion and center bending during continuous excavation. By making it also used for curve construction,
With a small number of jacks, and while keeping the length of the shield excavator short, it is possible to achieve an excellent effect of being able to cope with both continuous excavation and curved construction.

[Brief description of the drawings]

FIG. 1 is a cut-away side view of one embodiment of the present invention, and FIG.
FIG. 3 is an operation state diagram showing a straight excavation state of the apparatus shown in FIG. 3, FIG. 3 is an operation state diagram showing a time when the apparatus shown in FIG. 1 is being curved, and FIG. 4 is a cut-away side view of a conventional continuous excavation type shield excavator. is there. 1 is a cutter, 2 is a front body frame, 3 is a middle body frame, 4
Is a rear trunk frame, 7 is a middle trunk guide cylinder, 10 is a front trunk guide cylinder, 12
Is a bent surface, 15 is a first connector, 17 is a second connector,
Reference numeral 19 denotes a jack for propelling and bending, 20 and 21 denote pins, and 23 denotes a jack for receiving a reaction force.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-213993 (JP, A) Japanese Patent Application No. 62-25541 (Japanese Utility Model Application Publication No. 63-136089) Microfilm (JP, U) Microfilm (JP, U) Photographing the contents of the specification and drawings attached to the application form of Japanese Utility Model Application No. 55-158556 (Japanese Utility Model Application No. 57-85093)

Claims (1)

(57) [Claims] 1. A front body frame having a cutter on the front surface, a middle body frame integrally having a front body guide tube fitted on the rear inside of the front body frame, and a rear body inside the rear body frame. A rear trunk frame having a front body integrally formed with a middle trunk guide tube fitted with a curved surface for bending at the outer surface thereof, a reaction force receiving jack attached to the rear trunk frame so as to take a reaction force on the segment, A first connecting member for connecting and disconnecting the trunk guide tube to the middle trunk frame, a second coupling member for connecting and disconnectably connecting the front trunk guide tube to the front trunk frame, and a front trunk frame and rear A shield machine comprising: a propulsion / middle bending jack that bendably connects to a trunk frame.