JPH10227196A - Shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent interference with an entrance of a projection by providing a fixing cutting blade frontward of the projection to the outside of a shield frame. SOLUTION: A fixing cutting blade 30 is provided frontward of a projection 16 such as a simultaneous back-fill agent injector in a shield frame 10. The entrance peripheral part of the shaft earth retaining wall of a starting shaft and a reach shaft is formed by using a new material concrete wall. The cutter 11 of the edge of the shield frame 10 of a shield excavator 3 directly excavates a new raw material concrete wall, so that in the case where an entrance is formed, a fixing cutting blade 30 attached to the shield frame simultaneously excavates at a position corresponding to the projection 16 such as a simultaneous back-fill agent injector of the new raw material concrete wall. Thereby when the shield cutter 3 is passed in the portal excavated by the cutter 11, the projection 16 interferes with the entrance to damage it, and reversely the projection 16 is prevented from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine and, more particularly, to a new concrete concrete wall for a vertical shaft retaining wall, and a start / reach by excavating a wellhead directly on the new material concrete wall with a cutter. The present invention relates to a shield excavator that can prevent interference of a projection provided on a shield frame with a wellhead when performing the above.

[0002]

2. Description of the Related Art Conventionally, shield excavators have been used to excavate tunnels in the soil.

[0003] In the shield excavator, a cutter is rotatably mounted on a tip end surface of a cylindrical shield frame, and the cutter is rotated to excavate earth and sand. A segment assembling apparatus provided inside the shield frame is provided. By assembling circular blocks and other concrete blocks called arc-shaped segments in the excavation pit excavated with a cutter, a concrete tunnel is constructed, and furthermore, with a shield jack provided inside the shield frame The shield frame is propelled by supporting a reaction force at the tip of the existing portion of the tunnel.

As shown in FIG. 6, the shield excavator is provided with a starting shaft 1 and a reaching shaft 2, and excavates from the starting shaft 1 to the reaching shaft 2. .

Conventionally, in order to start and reach the shield excavator 3, as a protection work, the ground around the entrances 4 and 5 of the starting shaft 1 and the reaching shaft 2 has been improved. (Soil improvement sections 6 and 7) The shafts 4 and 5 were formed by manually destroying the shaft retaining walls 8 and 9 by human power.

In the drawings, reference numeral 10 denotes a shield frame of the shield machine 3, 11 denotes a cutter of the shield machine 3, 1
Reference numeral 2 denotes a tunnel constructed by assembling the segments 13 in a pit.

[0007] However, ground improvement work around the portions of the starting shaft 1 and the reaching shaft 2 that will be the entrances 4 and 5 of the starting shaft 1 and the reaching shaft 2 as a protection work is a large-scale work involving traffic regulation on the ground. There is. The demolition work of the shaft shaft retaining walls 8 and 9 by human power is difficult and time-consuming.
In addition, there is a problem that a large amount of dust and the like is generated during the operation, which is not preferable.

In recent years, as shown in FIG. 7, high-strength concrete and a high-strength reinforcing material such as carbon fiber have been used.
Shaft retaining walls 8, 9 using new material concrete walls 14, 15 having good machinability, retaining function, workability and waterproofness
It has been studied to form the peripheral portions of the wellheads 4 and 5 and to directly drill the new material concrete walls 14 and 15 with the cutter 11 of the shield machine 3 to form the wellheads 4 and 5.

[0009]

However, the starting and reaching means of the shield machine using the new material concrete wall have the following problems.

That is, in the cutter 11 of the shield machine 3, only the wellheads 4, 5 having a size corresponding to the outer diameter of the shield frame 10 can be formed on the new material concrete walls 14, 15. The shield frame 10 of the machine 3 projects outward from the outer diameter, as shown in FIG.
Projections 1 such as a simultaneous backing agent injection device as shown in FIG.
6, when the shield machine 3 passes through the wellhead 4, 5 excavated by itself, a projection 16 such as a simultaneous backing agent injection device interferes with the wellhead 4, 5, and the wellhead 4, 5. May be damaged, or conversely, the protrusion 16 such as a simultaneous backing agent injection device may be damaged.

The simultaneous backfill injecting device is a device for injecting the backfill into the excavation pit almost at the same time as the excavation of the ground by the shield machine 3, thereby preventing the subsidence of the ground. Also, a protrusion 16 such as a simultaneous backing agent injection device.
During normal excavation other than starting and arriving, it is possible to excavate while digging into the ground, so that it does not become an obstacle even if it protrudes.

In view of the above situation, the present invention uses a shield made of a new material concrete wall for a vertical shaft retaining wall, and uses a cutter to excavate a wellhead directly on the new material concrete wall to start and reach. An object of the present invention is to provide a shield machine capable of preventing interference of a protrusion provided on a frame with a wellhead.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a shield machine in which a fixed cutting blade 30 is provided in front of an outwardly projecting portion 16 of a shield frame 10.

In this case, the fixed cutting blades 30 may be provided in multiple stages in the front-back direction of the shield frame 10.

Further, the fixed cutting blades 30 of multiple stages may be arranged so that the front cutting blade 30 is wider and lower in height, and the rear cutting blade is narrower and higher in height.

The fixed cutting blade 3 of the shield frame 10
0, a cleaning nozzle 32 for spraying the cleaning liquid 31 toward the fixed cutting blade 30 is arranged, and a cleaning liquid passage hole 33 for passing the cleaning liquid 31 is formed at a position where the cleaning liquid 31 is sprayed on the fixed cutting blade 30. good.

Further, the fixed cutting blade 34 may be curved in the front-rear direction so that both ends are located rearward of the center.

According to the above means, the following effects can be obtained.

Using a high-strength concrete and high-strength reinforcing material such as carbon fiber, a new material concrete wall having good machinability, retaining function, workability, and water stoppage, a starting shaft and a reaching shaft are used. Form the part around the entrance of the retaining wall,
When a new material concrete wall is directly excavated by a cutter at the end of the shield frame of the shield excavator to form a wellhead, at the same time, the stationary cutting blade 30 attached to the shield frame 10 is used to start the shaft 1 and to reach. The positions corresponding to the projections 16 such as the simultaneous backing material injection device of the new material concrete walls 14 and 15 which form the periphery of the shaft openings 4 and 5 of the shaft shaft retaining walls 8 and 9 of the shaft 2 are cut.

As a result, when the shield machine passes through the wellbore excavated with its own cutter, the projections 16 such as the simultaneous backing agent injection device pass through the portion cut by the fixed cutting blade 30. Projection 1 such as backing agent injection device
6 can be prevented from interfering with the wellhead and damaging the wellhead, and conversely, the protrusion 16 such as a simultaneous backing agent injection device can be prevented from being damaged.

At this time, the fixed cutting blades 30 are provided in multiple stages in the front-rear direction of the shield frame 10, and the fixed cutting blades 30 in the multistage have a wider width and a lower height as they are at the front, and as the rear blades have more stages. Since the width is small and the height is high, when viewed from the front, as shown in FIG. 4, the whole is arranged so as to be slightly larger than the projection 16 such as a simultaneous backing agent injection device. In addition, the new material concrete wall can be gradually and gradually cut by the multi-stage fixed cutting blade 30, so that the wellhead is prevented from being damaged.

Then, the fixed cutting blade 3 is
When the cleaning liquid 31 is sprayed toward the fixed cutting blade 30, the cutting waste of the new material concrete wall cut by the fixed cutting blade 30 is sprayed from the cleaning nozzle 32 and sent through the cleaning liquid passage hole 33 of the fixed cutting blade 30. As a result, it is possible to wash away from between the fixed cutting blades 30, thereby preventing cutting chips from clogging between the fixed cutting blades 30 and lowering the cutting ability.

Further, since the fixed cutting blade 34 is curved in the front-rear direction so that both ends are located rearward of the center, the contact between the fixed cutting blade 34 and the fixed cutting blade 30 becomes gentler. Can be reduced, and the cutting edge can be made smooth.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show a first embodiment of the present invention.

The basic structure for starting and reaching the shield machine using the new material concrete wall is the same as that shown in FIG. 7, and the same parts are denoted by the same reference numerals and description thereof will be omitted. And if necessary, refer to FIG.

In this embodiment, an example in which the present invention is applied to a so-called muddy shield machine 3 is described. However, the present invention is not particularly limited to the muddy shield machine 3.

Reference numeral 17 denotes a partition wall formed at the tip of the shield frame 10, reference numeral 18 denotes a rotation axis of the cutter 11 pivotally supported by the partition wall 17, and reference numeral 19 denotes a rotation of the cutter 11 via a driving force transmission mechanism 20. Motor, 21 is the partition wall 17
And a cutter chamber formed between the cutter 11. Reference numeral 22 denotes a mud pipe for feeding mud water to the cutter chamber 21, 23 denotes a mud drain pipe for discharging mud water from the cutter chamber 21, and 24 denotes a part of mud water from the mud pipe 23 to the mud pipe 22. A muddy water reflux pipe for circulating use, 25 is a wing-like body called an agitator provided to prevent clogging of the inlet of the mud draining pipe 23, and 26 is an agitator driving device such as a motor for rotating the agitator 25. . Reference numeral 27 denotes a tail seal attached to the rear end side of the shield frame 10, reference numeral 28 denotes a shield jack for propelling the shield machine 3, and reference numeral 29 denotes an excavation excavated by the shield machine 3.

In the present invention, the shield frame 1
A fixed cutting blade 30 is provided in front of the protrusion 16 such as a simultaneous backing agent injection device at 0. When there are a plurality of projections 16, a fixed cutting blade 30
Are provided individually.

More specifically, the fixed cutting blades 30 are provided in multiple stages in the front-rear direction of the shield frame 10.

At this time, when the fixed cutting blades 30 of multiple stages are wider and lower in height in the front, and narrower and higher in height in the rear, the fixed cutting blades 30 are viewed from the front. As shown in FIG. 4, it is arranged so as to be slightly larger than the projection 16 as a whole, such as a simultaneous backing agent injection device.

Further, a cleaning nozzle 32 for spraying a cleaning liquid 31 toward the fixed cutting blade 30 is disposed behind the fixed cutting blade 30 of the shield frame 10. A cleaning liquid passage hole 33 for passing the cleaning liquid 31 is formed.

Next, the operation will be described.

The above-described shield excavator 3 of the muddy water type sends muddy water from the mud pipe 22 into the cutter chamber 21.
By using the properties of muddy water and the muddy water pressure to counter the earth pressure and water pressure acting on the face, the face is excavated by the cutter 11 while stabilizing the face ground, and the excavated earth and sand are discharged together with the muddy water into a drainage pipe The fluid is transported to the ground via 23 to collect solids such as earth and sand in muddy water.

In the present invention, the new material concrete walls 14 and 15 using high-strength concrete and high-strength reinforcing material such as carbon fiber and having good machinability, soil retaining function, workability and waterproofness are used. The cutter 1 at the tip of the shield frame 10 of the shield machine 3 is formed around the entrances 4 and 5 of the shaft shaft retaining walls 8 and 9 of the starting shaft 1 and the reaching shaft 2.
When the wellheads 4 and 5 are formed by directly excavating the new material concrete walls 14 and 15 at 1, at the same time, the fixed cutting blade 30 attached to the shield frame 10 is formed.
The new material concrete wall 1 which forms the vicinity of the entrances 4 and 5 of the shaft shaft retaining walls 8 and 9 of the starting shaft 1 and the reaching shaft 2
Positions corresponding to the projections 16 such as 4, 15 simultaneous backing agent injection devices are cut.

Thus, when the shield machine 3 passes through the wellheads 4 and 5 excavated by its own cutter 11, the projections 16 such as the simultaneous backing agent injection device pass through the portion cut by the fixed cutting blade 30. Therefore, the projections 16 of the simultaneous backing agent injection device and the like interfere with the wellheads 4 and 5 and damage the wellheads 4 and 5 and, on the contrary, the projections 16 of the simultaneous backing agent injection device and the like break Can be prevented.

At this time, the fixed cutting blades 30 are provided in multiple stages in the front-rear direction of the shield frame 10, and the fixed cutting blades 30 in the multistage have a wider width and a lower height as they are in front, and become smaller as they are in front. Since the width is small and the height is high, when viewed from the front, as shown in FIG. 4, the whole is arranged so as to be slightly larger than the projection 16 such as a simultaneous backing agent injection device. In addition, the new material concrete walls 14 and 15 can be gradually and largely cut by the multi-stage fixed cutting blades 30, thereby preventing the wellheads 4 and 5 from being damaged.

Then, the fixed cutting blade 3 is
By spraying the cleaning liquid 31 toward 0, the cutting chips of the new material concrete walls 14 and 15 cut by the fixed cutting blade 30 are jetted from the cleaning nozzle 32 and sent through the cleaning liquid passage hole 33 of the fixed cutting blade 30. Since the washing liquid 31 is washed away from between the fixed cutting blades 30, it is possible to prevent cutting chips from being clogged between the fixed cutting blades 30 and reduce the cutting ability.

FIG. 5 shows a second embodiment of the present invention, in which the fixed cutting blade 34 is curved in the front-rear direction so that both ends are located behind the center.

By doing so, the contact between the cutting blades becomes gentler than that of the fixed cutting blade 30 having a straight shape as shown in FIG. 3, so that the cutting resistance can be reduced and the cutting hole can be made smooth. Become like

Except for the above, it has the same configuration as that of the above-described embodiment, and the same operation and effect can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention.

[0043]

As described above, according to the shield machine of the present invention, a new material concrete wall is used for the vertical shaft retaining wall, and a wellhead is excavated directly on the new material concrete wall with a cutter to start and reach. In this case, it is possible to provide an excellent effect that interference of the projection provided on the shield frame with the wellhead can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall schematic side sectional view of a first embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a front view of FIG. 3;

FIG. 5 is a view similar to FIG. 3 of a second embodiment of the present invention.

FIG. 6 is a diagram showing a state of starting and reaching of a conventional shield machine.

FIG. 7 is a diagram showing a state of starting and reaching of a shield machine using a new material concrete wall.

FIG. 8 is a schematic front view showing a state of a protrusion attached to a shield frame.

FIG. 9 is an enlarged view of a portion IX of FIG. 8;

[Explanation of symbols]

 Reference Signs List 10 shield frame 16 protrusion 30 fixed cutting blade 31 cleaning liquid 32 cleaning nozzle 33 cleaning liquid passage hole 34 fixed cutting blade

Claims (5)

[Claims] 1. A fixed cutting blade (30) in front of an outward projection (16) of a shield frame (10).
A shield machine equipped with a shield machine. 2. The fixed cutting blade (30) is provided in multiple stages in the front-rear direction of the shield frame (10).
The shield machine described. 3. The multi-stage fixed cutting blade (30) is arranged so that the front cutting blade is wider and lower in height, and the rear cutting blade is narrower and higher in height. Or the shield machine described in 2. 4. A cleaning nozzle (32) for spraying a cleaning liquid (31) toward the fixed cutting blade (30) is disposed behind the fixed cutting blade (30) of the shield frame (10), and the fixed cutting blade (30) is provided. The shield machine according to any one of claims 1 to 3, wherein a cleaning liquid passage hole (33) through which the cleaning liquid (31) is passed is formed at a spraying position of the cleaning liquid (31) in (30). 5. The shield machine according to claim 1, wherein the fixed cutting blade (34) is curved in the front-rear direction such that both ends are located behind the central portion.