JP3417526B2 - How to cut obstacles such as residual piles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting obstacles such as piles left in shield work.

[0002]

2. Description of the Related Art In shield work, an obstacle such as a residual pile buried in the ground may be hit during construction of a tunnel by a shield machine, and such an obstacle needs to be removed. As a method of removal, conventionally, for example, a machine such as a crane is used to pull the ground from the ground, or an operator comes out on the face to cut or crush the obstacle to remove it.

[0003]

In order to pull out from the ground, a strong pulling force is necessary, and this is often impossible.
When it is impossible to pull out from the ground, the worker comes out to the face and removes it as described above, but an auxiliary construction method for ground improvement is required. Such ground improvement is, for example, by a column jet grout method or the like, a water tank, a super high pressure pump, high pressure water supplied through a super high pressure hose, air supplied by an air hose, a grout mixer,
The grouting agent supplied through the grout pump and the grout hose is injected into the ground around the obstacle by a triple pipe in a column machine. However, ground improvement requires large equipment and cost, and it is often difficult to improve the entire ground in the central part of the city, and removal of obstacles is dangerous.

The object of the present invention is to eliminate the inconvenience of the above-mentioned conventional example, and when the shield construction hits an obstacle such as a remaining pile, it is not necessary for an operator to directly work on the face, and therefore the ground It is an object of the present invention to provide a method for cutting obstacles such as piles that remain, which does not require improvement, requires a large-scale device, is safe, reliable, and low in cost.

[0005]

In order to achieve the above-mentioned object, the present invention firstly provides a plurality of high-pressure water injection nozzles containing abrasives in the cutter spokes of the cutter head at the tip of the shield machine. towards the working face surface juxtaposed, the swinging mechanism for swinging the jet nozzle in the vertical direction is provided in the injection nozzle, aligning the jetting nozzle, the abrasive injected from the nozzle is mixed while rotating the high pressure In the method of cutting obstacles such as remaining piles with water, cut the obstacles such as remaining piles.If you cut one place to the obstacles such as remaining piles to a predetermined depth, rotate the cutter spokes. The purpose is to move the cutting location to the next and double the circular cutting holes little by little to continuously open the cutting surface to cut the obstacle.

Secondly, in the muddy water pressure type shield machine,
Cut the obstacles existing in the face under pressure of muddy water, and when the obstacle is cut, reverse the sending / discharging mud transportation line at the shield machine or the position of the succeeding truck to collect the air discharged during cutting. The purpose is to drain the water from the upper part of the chamber as a circulation (cross circuit), then return to the original line when recovering the cut obstacle, and operate the circulation line to further increase the flow velocity.

According to the first aspect of the present invention, the cutter head at the tip of the shield machine is rotated at an extremely low speed, and high-pressure water containing abrasives is mixed from an injection nozzle provided on the cutter head toward the face of the face. Is sprayed on obstacles such as remaining piles, and is cut by this. Therefore, it is possible to cut by using the equipment of the shield machine, there is no need to improve the ground, and it is not necessary for the worker to appear in the face.

Since the jet nozzle swings by the swing mechanism, when cutting an obstacle in the shield cross section, not only rotation of the cutter head but also all obstacles appearing in the shield cross section can be cut. In this case, the obstacle is cut into a circular shape , and the circular cutting holes are doubled next to each other so as to be continuous to cut all the obstacles.

According to the second aspect of the present invention, in addition to the above-mentioned action, when cutting an obstacle, a mud pressure is applied to the face to collect the air discharged during the cutting, and a sending / discharging mud transport line is used. Reverse circulation (cross circuit) at the shield machine or the position of the succeeding trolley. After this, when collecting the cut obstacle, return to the original line and operate the circulation line to further increase the flow velocity, and the obstacle can be collected. Therefore, it is possible to stabilize the cutting face when the obstacle is cut and collected without particularly improving the ground.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of a cutting device used in a method for cutting an obstacle such as a remaining pile of the present invention, and FIG. 2 is a vertical cross-sectional side view showing an operation mechanism of an injection nozzle which is a main part of the same. Reference numeral 1 denotes a shield machine, and a plurality of high-pressure water jet nozzles 4 mixed with abrasives in the cutter spokes 3 of the cutter head on the front surface of the shield body 2 of the shield machine 1 are shown in FIGS. 3 and 4. 14 in the example
The individual shield bodies 2 are arranged in tandem in the diameter direction of the shield body 2. In FIG. 3, 5 indicates a cutter bit.

Each hose 8b, 9b is connected to each injection nozzle 4, a joint 7 for hose switching is connected to the end of each hose 8b, 9b, and one of a plurality of hoses 8b, 9b is connected via this joint 7. An ultra-high pressure pump 8 for sending heel high-pressure water and an abrasive supply device 9 are connected to hoses 8a, 9 respectively.
Connect with a.

Each jet nozzle 4 is provided with a sliding mechanism for making the jet nozzle 4 slidable in the face direction, a rotating mechanism for rotating the jet nozzle 4 in the vertical direction, and a swing mechanism for swinging the jet nozzle 4 in the vertical direction. Provide each.

As shown in FIG. 2, the injection nozzle 4 is supported by bearings 10 provided on the cutter spokes 3 via ball joints 11 so as to be slidable, rotatable, and swingable. A pair of rotating screw rods 12 arranged horizontally toward the injection nozzle 4 are arranged on both sides of the jet nozzle 4 in parallel with the jet nozzle 4, and the rotary screw rods 12 are inserted and slide horizontally in the rotation. The sliding body 13 is fixed to the end of the injection nozzle 4.

Reference numeral 14 in the drawing denotes a hydraulic motor which is a drive source for rotating the rotary screw rod 12, and the hydraulic motor 14 is a rotary screw rod.
The jet nozzle 4 is fixed to an end portion of a casing 6 that houses 12, the sliding body 13 and the like, and the injection nozzle 4 is housed in the casing 6 so as to slide in and out from the casing 6 in the direction of the cutting face.

The rotating mechanism has a hydraulic motor 15 as a drive source.
Is fixed to the sliding body 13, a gear 16 is attached to the drive shaft of the hydraulic motor 13, a gear 17 attached to the injection nozzle 4 is meshed with the gear 16, and the injection nozzle 4 is rotatable in the circumferential direction of the shaft. It is configured to be

In the swing mechanism, an elevating device such as a hydraulic jack 18 is disposed below one end of the casing 6 and the tip of a rod 18a thereof is rotatably attached to the lower portion of the casing 6 to form a casing. A shaft portion 6a provided at the other end of 6 is rotatably attached to the cutter spoke 3 as shown in FIG. 5, and the injection nozzle 4 is attached to the bearing 10 provided on the cutter spoke 3 as described above. Ball joint 11
Supported by and configured.

In this way, the casing 6 is slidably attached to the cutter spokes 3 as shown in FIG. 5, so that the injection nozzle 4 disposed in the casing 6 slides from the cutter spokes 3 toward the cutting face. It is mounted so that it can be retracted and retracted at the same time as it is mounted so as to be rotatable in the circumferential direction of the shaft.

In this case, the casing 6 is not arranged at the center in the length direction of the cutter spoke 3 as shown in FIGS. 3 and 5, but is arranged close to one end and along the other end. A space 24, which is a space for replacing the injection nozzle 4, is secured.

In FIG. 2, 19 is a ball valve used when closing this valve when replacing the nozzle, and 20 is a mouth packer used for tightening when preventing water from leaking from the injection nozzle 4. .

Next, a method of hitting an obstacle such as a remaining pile and cutting the obstacle when the mud pressure shield machine is excavating will be described with reference to the flowchart of FIG. During a normal shield excavation, the shield excavator 1 is advanced at a normal speed while excavating the face with the cutter bit 5 at the tip, and at this time, as shown in FIG. The muddy water is sent from the pump P1 through the valve V1 to the chamber at the tip of the shield body 2, and at the same time, it is mixed with the excavated soil after passing through the valves V3 and V5 to stabilize the cutting face and from the pump P2 through the treatment plant. Has been discharged to.

When an obstacle such as a remaining pile is detected on the face,
After confirming the shield cross-section position of the obstacle, determine the cutting position of the obstacle and change the mud water transportation line as shown in FIG.
That is, the muddy water sent to the chamber in the front part of the shield body is turned upside down from the normal state, and is drained from the upper part of the chamber so that air does not collect in the chamber.

In this manner, with the mud water transportation line being reversed from the normal state, a plurality of injection nozzles 4 corresponding to the cutting position of the obstacle are selected, and the ultra-high pressure pump 8 is connected to the injection nozzle 4. The high-pressure water and the abrasive are sent from the abrasive supply device 9, and the high-pressure water mixed with the abrasive is jetted from the jet port at the tip of the jet nozzle 4 toward the obstacle to start cutting.
At this time, the rotation speed of the cutter spokes 3 is set to an ultra-low speed so that the cutter spokes 3 can be accurately aligned at each cutting, and can be cut while rotating the cutter spokes 3.

The cutting by the jet nozzle 4 is performed while sliding, rotating and rocking the jet nozzle 4,
The sliding is performed by driving the hydraulic motor 14 installed in the casing 6 to rotate the rotary screw rod 12 and sliding the sliding body 13 in the horizontal direction, whereby the end portion is fixed to the sliding body 13. The injection nozzle 4 slides.

8 to 10 by sliding the injection nozzle 4.
As shown in FIG. 4, the injection nozzle 4 moves toward the remaining pile 23 which is an obstacle and cuts it. The distance that can be cut by jetting is set to about 100 mm as an example.

At the same time, the hydraulic motor 15 is driven to rotate the gear 16, and the rotation of the gear 16 is transmitted to the gear 17 so that the gear 17
The injection nozzle 4 attached to is rotated. As a result, from the injection nozzle 4 whose injection port is directed obliquely, as shown in FIG.
As shown in, the high-pressure water is sprayed in a conical shape, and the cuttable diameter is 100 mm, for example.

In this case, since the hydraulic motor 15 is fixed to the sliding body 13 even if the injection nozzle 4 is sliding simultaneously,
A hydraulic motor 15 and a gear 16, which are integrated with the sliding body 13;
17 moves, and the injection nozzle 4 can be rotated at the same time as sliding without any trouble.

Further, at the same time, the rod 18 of the hydraulic jack 18
When a is expanded and contracted to move the end portion of the casing 6 up and down, the entire casing 6 swings around the shaft portion 6a at the other end as a central axis. As shown in FIG. 6, the swinging range is set to about 15 ° in each of the upper and lower directions. As a result, the casing 6
The direction in which the high-pressure water is jetted from the jet port of the jet nozzle 4 protruding from the jet nozzle 4 also moves within the range of 30 °. In this case, since the injection nozzle 4 is supported by the ball joint 11, the injection nozzle 4 freely swings following the swing of the casing 6.

As described above, the remaining pile 23 is cut while simultaneously sliding, rotating and rocking the injection nozzle 4, but the cutting shape becomes the circular hole shape as described above. After cutting the location to the specified depth, rotate the cutter spoke 3 to move the location next to the location, and double the circular cutting hole as shown in FIG. Spread out.

When cutting using the jet nozzle 4, the cutter spokes 3 rotate at an extremely low speed, and the rotational movement amount is
Set it to be around 40 cm. Further, since the cutter spokes 3 are rotated at an extremely low speed even during cutting, the cutting locus has an arc shape as shown in FIG.

When the cutting at one place is completed by one injection nozzle 4, the hoses 8a and 9a from the ultrahigh pressure pump 8 and the abrasive material supplying device 9 are connected to another injection nozzle 4 by the joint 7. Connect to the hoses 8b and 9b by switching. This switching work is done manually.

In this way, the hoses 8a and 9a are sequentially switched to the hoses 8b and 9b of the different injection nozzles 4 by the joint 7 and the injection nozzles 4 to be used are sequentially switched to cut the remaining pile 23. The range that can be cut by using all the injection nozzles 4 is a range of concentric circles substantially equal to the range of the face plate on the front surface of the shield body 2 as shown in FIG.

When the remaining pile 23 is made of H steel or mortar constructed by the PIP method, the injection nozzle 4
Although it is possible to cut with high pressure water mixed with abrasives from the above, it is difficult to cut only the high pressure water mixed with abrasives for continuous walls etc. where reinforced cages are embedded. Cut together with 5.

When the cutting of the remaining pile 23 in the shield cross section using the injection nozzle 4 is completed, the shield machine 1 is driven at low speed and the cut obstacles are collected as shown in FIG.
By using the mud water transportation line as the recovery line and operating the circulation line, the flow rate of mud during normal times is doubled or more at the trommel inlet side, thereby increasing the flow velocity. The cutting pile is taken and sent together with the muddy water to the treatment plant for recovery.
At this time, the rotation of the cutter spokes 3 is slow.

When the collection of the cut piles is completed, the normal shield excavation is resumed.

[0035]

As described above, according to the method of cutting an obstacle such as a remaining pile of the present invention, when a worker hits an obstacle such as a remaining pile during shield work, the worker directly works on the face to work. There is no need, therefore, there is no need to make ground improvement, and the device is not large in size, and it is safe, reliable, and low in cost.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a cutting device used in a method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 2 is a vertical cross-sectional side view showing an operation mechanism of an injection nozzle which is a main part of a cutting device used in a method of cutting an obstacle such as a remaining pile of the present invention.

FIG. 3 is a front view of the front surface of the shield body of the cutting device used in the method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 4 is an explanatory view showing an arrangement of jet nozzles of a cutting device used in the method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 5 is an explanatory view showing a built-in position of a jet nozzle of a cutting device used in a method of cutting an obstacle such as a remaining pile of the present invention into a cutter spoke.

FIG. 6 is an explanatory diagram showing a swing range of an injection nozzle of a cutting device used in the method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 7 is a flowchart showing a method for cutting an obstacle such as a remaining pile according to the present invention.

FIG. 8 is a side view showing a relationship between the jet nozzle and an obstacle in a cutting start state by the method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 9 is a side view showing the relationship between the jet nozzle and an obstacle during cutting by the method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 10 is a side view showing the relationship between the jet nozzle and the obstacle in a state where the cutting by the method for cutting the obstacle such as the remaining pile according to the present invention is further advanced.

FIG. 11 is a side view of a pile cut state according to the method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 12 is a front view of a pile cutting state according to the method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 13 is an explanatory view showing a pile cuttable range by the method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 14 is a piping diagram showing a mud water transportation line during normal excavation by the method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 15 is a piping diagram showing a muddy water transportation line when cutting a pile by the method for cutting an obstacle such as a remaining pile of the present invention.

FIG. 16 is a piping diagram showing a muddy water transportation line at the time of collecting a cutting pile by the method for cutting an obstacle such as a remaining pile of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shield excavator 2 ... Shield main body 3 ... Cutter spoke 4 ... Injection nozzle 5 ... Cutter bit 6 ... Casing 6a ... Shaft part 7 ... Joint 8 ... Super high pressure pump 8a, 8b ... Hose 9 ... Abrasive supply device 9a, 9b ... Hose 10 ... Bearing 11 ... Ball joint 12 ... Rotating screw rod 13 ... Sliding body 14 ... Hydraulic motor 15 ... Hydraulic motor 16 ... Gear 17 ... Gear 18 ... Hydraulic jack 18a ... Rod 19 ... Ball valve 20 ... Port packer 21 ... Tank 22 ... Trommel 23 ... Remaining pile 24 ... Space

Continued front page    (72) Inventor Kosuke Shioda               Kashima, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo               Construction Co., Ltd. (72) Inventor Tsutomu Imagawa               Kashima, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo               Construction Co., Ltd. (72) Inventor Katsuji Ikezoe               Kashima, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo               Construction Co., Ltd. (72) Inventor Yoshiken Sakamoto               Kashima, 1-8-3 Akasaka, Minato-ku, Tokyo               Construction Co., Ltd. Tokyo Branch (72) Inventor Takashi Isobe               Deer, 2-1-1, Tobita, Chofu-shi, Tokyo               Shima Construction Co., Ltd. Technical Research Center (72) Inventor Katsumi Inomata               Kashima, 1-8-3 Akasaka, Minato-ku, Tokyo               Construction Co., Ltd. Tokyo Branch                (56) Reference JP-A-5-156892 (JP, A)                 Japanese Patent Publication 5-46440 (JP, B2)                 Japanese Patent Publication 7-18314 (JP, B2)                 Japanese Patent Publication 7-65462 (JP, B2)

Claims (2)

(57) [Claims] 1. A plurality of injection nozzles of high-pressure water mixed with abrasives are arranged in parallel to cutter spokes of a cutter head at the tip of a shield machine, and the injection nozzles are vertically moved to the injection nozzles. provided swinging mechanism for swinging in a direction to align the jetting nozzle, a high pressure water abrasive injected from the nozzle is mixed while rotating, obstacles such as leaving the pile for cutting an obstacle such as leaving the pile In the cutting method, if one of the remaining piles and other obstacles has been cut to a specified depth, rotate the cutter spoke to move the cutting position to the next position and double the circular cutting hole. A method for cutting obstacles such as residual piles, characterized in that the cut surface is continuously widened to cut obstacles. 2. In a muddy water pressure type shield machine, an obstacle existing in the face is cut while the face is pressurized with muddy water, and at the time of cutting the obstacle, in order to collect the air discharged during cutting,
In order to further increase the flow velocity, the transport line for sludge and sludge is drained from the upper part of the chamber as reverse circulation (cross circuit) at the shield machine or the position of the trailing truck, and then when the cut obstacle is recovered, it is returned to the original line. The method for cutting an obstacle such as a residual pile according to claim 1, wherein the circulation line is operated.