JPH01125491A - Method of controlling jack of shield excavator for cast-in-place lining - Google Patents

Abstract

PURPOSE: To equalize the quality of lining concrete by compressing the lining concrete by a press jack and adjusting the shield jack pressure in advancing the rear barrel part according to the advancing resistance of the rear barrel part. CONSTITUTION: A plurality of jacks are so installed that a middle-bent jack 28 is provided between an external cylinder 12a of a middle barrel part of a shield machine having a skin plate divided into three stages and capable of constructing a curved line and a front barrel part 10, a shield jack 30 is provided between the external cylinder 12a and the rear barrel part 14, and a press jack 34 and a reaction transmitting jack 36 are provided in the rear barrel part 14 in the circumferential direction at some intervals apart from each other. This machine is so constituted that, in excavating a curved line by the machine, the jack pressure of the shield jack 30 is controlled corresponding to the advancing resistance of the rear barrel part 14 by a hydraulic control circuit so that the compression pressure of the lining concrete 50 applied via the press jack 34 can be held at constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for controlling the jerk of a shield excavator for cast-in-place lining, and more particularly to a method for controlling the compressive force applied to lining concrete so as to be constant.

(Prior Art) As is well known, the shield method is a method for excavating and constructing underground tunnels such as subway tunnels and undersea tunnels.

The shield method uses a cylindrical shield excavator equipped with a digging bit at the tip, and one type of this method is the cast-in-place lining method, which covers the excavation in parallel with the excavation.

In this cast-in-place lining construction method, a formwork is installed at the rear of the shield excavator, and concrete is poured into the space defined by the formwork, the skin plate of the shield machine, and the preceding lining concrete. While applying compressive force to the shaft and moving the shield excavator forward, concrete lining is sequentially formed inside the tunnel.

By the way, when performing curved construction using the conventional shield construction method, a folding type shield excavator, which is a cylindrical shield excavator divided into a plurality of parts, is known.

In this type of shield excavator, a cylindrical skin plate is divided into front and rear body parts, and a plurality of propulsion jacks are arranged between these chest parts, and the amount of expansion and contraction is varied during curved construction.

Additionally, multiple press jacks are placed on the rear body side to compress the lining concrete.

However, when constructing the cast-in-place lining method using such a double-shell type shield excavation, there are problems, particularly in the method of controlling jacking, as described below.

(Problems to be Solved by the Invention) In other words, in the cast-in-place lining method, the most important control item is to apply a certain compressive force to the poured lining concrete.

This compressive force is applied via the press jack as the rear trunk moves forward, but when the rear trunk moves forward, the frictional resistance of the ground acts on it, and the magnitude of the frictional resistance is The forward movement of the rear torso is not always constant, as it changes depending on the nature of the mountain, the curvature of the curve, etc.

For this reason, the compressive force of the press jack is affected by the forward movement state of the rear body, causing variations in the compression of the lining concrete, making it difficult to obtain lining concrete of consistent quality.

This invention was made in view of these conventional problems, and its purpose is to provide a method for controlling the jitters of a double-barrel shield excavator that can produce homogeneous lining concrete. .

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a skin play 1 to 1 to right side of the front and rear torso divided into a plurality of parts, and a skin play between the future chest. A cast-in-place Rira Igni [compound used in the method] (in a type shield excavator) equipped with a shield jack and a press jack for compressing the lining concrete cast by installing a formwork behind the rear body. When compressing the lining concrete with the press jack and moving the rear body forward, the jacking pressure of the shield jack is adjusted according to the forward movement resistance of the rear heel.

(Function) According to the control method with the above configuration, when the rear heir is moved forward, the jacking pressure of the shield jack is controlled in response to the forward resistance, so that the compression of the lining concrete applied via the press jack at this time is controlled. Can maintain constant pressure.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a shield excavator for cast-in-place lining according to the present invention.

In the shield excavator shown in the figure, the skin plate is divided into three stages to enable curved construction, and the front body part 10. Middle trunk 12. It has a rear body part 14.

A cutter head 16 is rotatably disposed at the tip of the first part 10, and the cutter head 16 excavates the ground on the face side by the rotational driving force of a cutter drive motor 18.

Further, a partition wall 20 is provided in the front body part 10 on the back side of the cutter head 16, and the cutter head 16, the front body part 10, and the partition wall 20 form a compartment 21 for storing excavated earth and sand. A screw conveyor 22 for discharging earth and sand in the compartment 21 to the outside is installed with one end penetrating the partition wall 20.

In this embodiment, the screw conveyor 22 is divided into two parts within the middle body part 12 in order to cope with curved construction, and is divided into two parts, a primary screw conveyor 22a and a secondary screw conveyor 2.
2b is connected to each screw conveyor 22a via a flexible member 24.

22b is rotationally driven by a drive motor 26.

The middle body part 12 is a double cylinder that is slidable in the axial direction and is composed of an outer cylinder 12a and an inner cylinder 12b.
A plurality of folding jacks 28 are pivotally mounted at intervals in the circumferential direction between a and the front body portion 10.

Further, a plurality of shield jacks 30 are pivotally mounted between the outer cylinder 12a and the rear body portion 14 at intervals in the circumferential direction.

Further, the inner cylinder 12b and the rear body portion 14 are connected via a folding pin 32.

On the other hand, a plurality of press jacks 34 and reaction force transmission jacks 36 fixed thereto are installed on the rear body section 14 at intervals in the circumferential direction.

Each press jack 34 has a telescoping rod 34a and a cylinder 34b that accommodates the telescoping rod 34a.The telescoping rod 34a is inserted into a casing 38 whose one end has an opening, and its tip is pivotally connected with a pin 4o. A press ring 42 for compressing the lining concrete is attached to the rear end of the cylinder 34b.

Further, the reaction force transmission jack 36 is also fixed to the rear body section 14 via the casing 38a, similar to the press jack 34.
The telescopic rod 36a is connected to the casing 38a by the bin 40a.
It is pivoted to.

That is, in the shield excavator of this embodiment, the press jack 34 and the reaction force transmission jack 36 are housed in the casing, and the casing 38 and the telescopic rod 34a,
36a is pivotally connected to each cylinder 34b, 36b.
It is configured so that it can extend and contract backwards.

Note that the member 44 shown in FIG. 1 supports the screw conveyor 22 and has a formwork 46 on the upper surface.
It is a pedestal on which a trolley 48 for transportation and installation is movably mounted.

In addition, although detailed illustration is omitted, the inner and outer cylinders 1 of the middle body part 12
A sealing backing is interposed between 2a and 2b where necessary.

The operation of the jacks 28, 30, 34, and 36 when performing curve construction using the shield tunneling machine having the above configuration will be explained based on FIG. 2.

FIG. 2(a) shows a state in which preparations for shield excavation have been completed, and in this state, the folding jack 28 and the shield jack 30 are stopped in a contracted state, and the reaction force transmission jack 36 is in an extended state. The press jack 34 is compressing the lining concrete 50 placed through the press ring 42.

First, the front body portion 10 is deflected as shown in FIG. 2(b).

The front body portion 10 is deflected by extending the plurality of folding jacks 28 located on the outside in the direction in which the bending is to be performed while excavating earth and sand, and this reaction force is transferred to the formwork 46 via the reaction force transmission jacks 36. Pick it up.

When the front trunk section 10 is deflected by a predetermined angle, as shown in FIG.
As shown in FIG. 3, while the cutter head 16 is rotated by the cutter drive motor 18, the shield jack 30 is extended and digging is started again Δ.

As a result, the outer cylinder 12a of the middle body portion 12 gradually advances forward while excavated earth and sand are discharged to the outside by the screw conveyor 22.

When the outer cylinder 12a of the middle body part 12 advances to the tip of the inner cylinder 12b, digging is completed, and as shown in FIG. 2(d), each jack 28, 30, 34. ．． 36 are each stopped in an extended state.

Next, as shown in FIG. 2(e), the press jack 3
4 and the reaction force transmission jack 36 are contracted, and preparations for pouring the next stage of lining concrete are made.

When the preparation for pouring is completed, as shown in FIG. 2(f), the reinforcing bars 52 are assembled and the new formwork 46a is attached to the existing formwork 46.

Since the formwork 46a used here is curved, the length of the formwork 46a is shortened at the top and bottom and left and right to accommodate the curve.

Then, when a new lining concrete 50a is poured in front of the existing lining concrete 50, a second lining concrete 50a is placed in front of the existing lining concrete 50.
As shown in Figure (0), the rear trunk section 14 moves forward.

Here, in the present invention, when moving the rear heir part 14 forward, the third
The shield jack 30, press jack 34, and reaction force transmission jack 36 are controlled by the hydraulic control circuit shown in the figure as described below.

The above shield jacket 30. Details of the hydraulic control circuit for the press jack 34 and the reaction force transmission jack 36 are shown in FIG.

The control circuit shown in the figure includes front chambers 301, 361, 381 and rear chambers 302, 362.3 of the shield jack 30, reaction force transmission jack 36, and press jack 38, respectively.
82 and the oil tanks 60, 60, the primary and secondary paths 62 to 72, and each jack 30,
36. Pairs of primary and secondary paths 62 connected to 38
- 72 are provided with first to third electromagnetic switching valves 74, 76, and 78, respectively.

In the primary path 62 of the shield jack 3o, a first electromagnetic proportional reducing valve 80 and a pump 82 are provided between the first electromagnetic switching valve 74 and the oil tank 60.

On the other hand, in the primary path 66 of the press jack 34, a second electromagnetic proportional reducing valve 86 and a pump 88 are provided between the second electromagnetic switching valve 76 and the oil tank 60.

1 connected to the front chamber 361 of the reaction force transmission jack 36
The next route 70 is the primary route 66 of the press jack 34.
is connected to the downstream side of the pump 88, and the pump 8
A reducing valve 9 is provided between the 8 and the third electromagnetic switching valve 78.
0 is the default.

And between the pump 82 and the first electromagnetic proportional reducing valve 80 in the primary path 62 of the shield jack 30, and between the first electromagnetic switching valve 74 and the electromagnetic proportional relief valve in the secondary path 64 of the same jack 30. A hydraulic pressure gauge PS1. PS2. PS3 is provided, and each output of these oil pressure gauges PS1 to PS3 is input to a pressure setting controller 92.

The shield jack 30 and press jack 34 are controlled by the pressure setting controller 92 in accordance with the procedure shown in FIG.

Note that the first to third electromagnetic switching valves 74, 76, 78
are set in the positions shown in FIG. 3 in the state shown in FIG. 2 (Q).

When the control starts, first, in step S1, a lower limit value Pi and an upper limit value pm of the compression pressure of the lining concrete 50a by the press jack 34 are set, and the pressure value P currently applied to the front chamber 341 of the press jack 34 is set.
S3, the pressure values PS2°PSl of the front and rear chambers 301 and 302 of the shield jack 30 are input.

Next, in step S2, the lower limit value Pi of the set pressure and PS3 are compared, and if PS3 is smaller than Pi, it is determined in step S4 whether or not the jack pressure of press shirt 1:, 34 can still be increased. , if the voltage can be increased,
In step S5, the pressure on the front chamber 341 side of the press jack 34 is increased by a predetermined pressure, and the process returns to step S2.

On the other hand, if it is determined in step S4 that the jack pressure of the press jack 34 cannot be increased, then in step S6 the jack pressure of the press jack 34 is determined to be higher than that of the shield jack 30. 302 side pressure PS1 is O
If it is larger than 0, the pressure on the rear chamber 302 side is reduced in step S7 and the process returns to step S2.

If it is determined in step S7 that PSL is smaller than O, the pressure on the front chamber 301 side of the shield jack 30 is increased in step S8, and the process returns to step S2.

In the process from step S2 to step S8 above, first step S2. With the flow circulating through S4- and S5, the compression pressure of the lining long cleat 50a by the press jack 314 is kept higher than the lower limit value P1 of the set pressure. Since the working oil pressure generates only a pressure lower than the lower limit value Pi, steps 86 to S8 are executed and tU
The first electromagnetic reducing valve 80 in the hydraulic circuit of the shield jack 30 lowers the retracting hydraulic pressure so that the forward resistance of the l5i14 increases (step S7).
Alternatively, the electromagnetic proportional relief valve 84 in the same circuit is throttled (step S8) to generate back pressure in the return circuit and generate a negative thrust in the shield jack 30.

Then, when it is determined in step S2 that PS3 is larger than Pi, step S9 is executed, and this step S
In step 9, the negative limit value Pm and PS3 of the set pressure are compared, and if PS3 is smaller than pm, it is determined in step S10 whether or not the jacking pressure PS3 of the press jack 34 can still be reduced, and the pressure can be reduced. If so, the pressure on the front chamber 341 side of the press jack 34 is lowered in step S11, and the process returns to step S9.

On the other hand, if it is determined in step 310 that the jack pressure PS3 of the press jack 34 cannot be reduced, it is determined in step S12 whether or not the pressure PS2 on the front chamber 301 side of the shield jack 30 is greater than O; If it is larger than O, the pressure on the front chamber 301 side is reduced in step S13 and the process returns to step S9.

Furthermore, if it is determined in step S12 that PS2 is smaller than O, then in step S14 the shield jack 3
The pressure of the pressure saw on the rear chamber 302 side is increased and the process returns to step S10.

In the process from step S9 to step S14, first, in a circulating flow of steps S9, 810 and 811, the soldering concrete 50a is heated by the press jack 34.
At this time, if the forward resistance of the rear cylinder 14 is high, even if the hydraulic pressure of the press jack 3/'I reaches the upper limit value pm, the rear cylinder 14 will not move. Since it does not move forward, execute steps 86 to $8, and open the electromagnetic proportional relief valve 84 of the hydraulic circuit on the front chamber 301 side of the shield jack 30 (step 513) in order to apply a pulling force to the rear body 14. , or rear chamber 3
The pressure of the first electromagnetic proportional registration valve 80 on the 02 side is increased (step 514).

Now, as described above, regardless of the forward movement resistance of the rear 11i1i14, the press pressure by the press jack 34 is kept constant, and when the 1i14 advances to a predetermined position,
The state shown in FIG. 2(h) is reached, one round of eccentric excavation is completed, and the same jacking operation is repeated thereafter.

In addition, the shield and press jack 3 shown in FIG.
In the 0.34 control, the reaction force transmission jack 36 is controlled by the reducing valve 90 so as not to create resistance in the forward and reverse directions with respect to the forward movement of the rear body 14.

= 16- Furthermore, in the above embodiment, a shield tunneling machine divided into three parts was illustrated, but the present invention can be applied even if the shield tunneling machine is divided into two parts, each consisting of a front body and a rear body.

(Effects of the Invention) As described above in detail in the embodiments, according to the method for controlling the jacking of the shield excavator for cast-in-place lining according to the present invention, the lining concrete is compressed regardless of the change in the forward movement resistance of the rear body. Since the press jacking pressure is kept constant, high quality lining concrete can be obtained.

[Brief explanation of the drawing]

Figure 1 is an overall view of a shield tunneling machine to which the method of the present invention is applied, Figure 2 is an explanatory diagram showing the process of constructing a curved line with the shield tunneling machine, Figure 3 is a hydraulic circuit diagram of the shield tunneling machine, and Figure 3 is a hydraulic circuit diagram of the shield tunneling machine. FIG. 4 is a flowchart showing the procedure of jack control. 10... Front torso 12... Middle torso 14...
・Rear body part 16...Cutter head 28...
・Central fold jack 30...Shield jack 34・
...Press jack 36...Reaction force transmission jack 46
, /1.6... Formwork 50.50a... Lining concrete patent applicant Obayashi Co., Ltd.
Co., Ltd. Okumura Kouma Hitachi Zosen Co., Ltd. Representative Patent Attorney - Ken Iro Axis
Patent Attorney Matsumoto Jiri l1N [n ~---/'%- 1C 1-t 1-N ℃ Duck 1. − to to Φ to□ □

Claims (1)

[Claims] A skin plate with front and rear body parts divided into multiple parts, a shield jack installed between the future body parts, and a formwork installed behind the rear body part to compress the lining concrete to be cast. In a double-barrel shield excavator used in the cast-in-place Lyraig construction method, which is equipped with a press jack to compress the lining concrete and advance the rear body, the jacking pressure of the shield jack is increased. A jack control method for a shield excavator for cast-in-place lining, the method comprising adjusting according to the forward resistance of the rear body.