JPH09158683A - Lining constructing device of tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the pressurization control by pressurizing jacks, and enhance the filling performance of a filler such as concrete. SOLUTION: A lining constructing device of a tunnel propels a shield 1 according to excavation of a tunnel, and inputs and places concrete between a segment 10 and an excavating surface 31 from a concrete supply pipe, and pressurizes this placed concrete by plural pressurizing jacks 5 through a press ring 6, and is provided with a concrete pressure measuring device 9, a multiflow type hydraulic pump unit 22 to displace the respective pressurizing jacks 5 at the same stroke and a rotational quantity control means 21 to control an operating fluid supply quantity supplied to the multiflow type hydraulic pump unit 22 so that pressure of the placed concrete coincides with preset pressure. An introducing port into which the concrete supply pipe can be slidably inserted is provided in the press ring 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a tunnel lining construction method for constructing a lining while placing a filler such as concrete or mortar along with the promotion of a shield.

[0002]

2. Description of the Related Art As a method for constructing a lining of a tunnel excavated by using a shield device, the applicant of the present invention has proposed, for example, Japanese Patent Publication No. 5-38120.

This construction method is as shown in FIG. Here, the cylindrical shield 1 is provided at the rear of an unillustrated excavator, and includes a shield jack 2 including a jack 2A, 2B that expands and contracts in the front-rear direction in an intermediate portion,
Concrete is placed in the tail portion 1A.

This concrete is poured between the segment 10 formed by connecting the precast concrete panels 12 with the reinforcing material 13A and the ground 30.
Further, the concrete after the pouring is pressurized through the press ring 6 by the pressure jack 5 housed in the jack chamber 4 in the rearward direction, and the filling property is enhanced.

The pressure jack 5 has a shield 1
A plurality are provided along the inner circumference of the. The concrete is poured from a concrete supply pipe 7 (not shown) fixedly supported by the press ring 6.

After the concrete is poured and filled, the shield jack 2 is provided with a spreader 2 at the rear end of the jack 2B side.
By being extended while being supported by the segment 10 via 6, the shield 1 advances as the excavation progresses, and the tunnel lining construction proceeds.

In such a lining construction method, the cast concrete needs to be pressurized by the pressure jack 5 at an appropriate pressure. The pressure adjustment method for the pressure jack 5 is as follows. , For example, Japanese Patent Application No. 5-8
No. 6026 is proposed.

This pressure adjusting method is as shown in FIG. Here, the plurality of pressure jacks 5 are controlled by an accumulator 20 provided for each jack so as to maintain an appropriate pressure.

[0009]

By the way, in such a tunnel lining construction method, the pressure of the concrete placed behind the press ring 6 differs depending on the position on the circumference of the press ring 6, and accordingly, The hydraulic pressure acting on the pressure jack 5 needs to be set separately depending on the position on the press ring 6 supported by the pressure jack 5. Therefore, a pressure adjusting device such as an accumulator 20 is required for each pressure jack 5, which is complicated and uneconomical.

Further, at this time, since the pressure oil discharged from the hydraulic pump is distributed and supplied to the individual pressure jacks 5, a difference in pressure between the pressure jacks 5 causes a difference in the stroke of the jacks. This has been a cause of difficulty in maintaining the press ring 6 in a uniform position all around.

Further, since the concrete supply pipe 7 is fixedly supported by the press ring 6, the poured concrete only flows along the concrete side surface of the press ring 6, especially when the tunnel diameter is large. ,
In some cases, the filling of concrete into a place away from the concrete supply pipe 7 becomes insufficient, and a large number of concrete supply pipes 7 are required to cope with this.

The present invention focuses on such problems,
An object of the present invention is to provide a tunnel lining construction method capable of simplifying pressurization control by a pressurizing jack and enhancing the filling property of a filler such as concrete.

[0013]

According to a first aspect of the present invention, a shield propelled according to excavation of a tunnel, a segment assembled in a ring shape along the excavation surface of the tunnel, and a support reaction force from this segment are taken. A shield jack for propelling the shield, a filler supply pipe for charging and placing a filler between the segment and the excavation surface, and a shield disposed in parallel with the shield jack on the shield via the press ring. In a lining construction device for a tunnel provided with a plurality of pressure jacks for applying pressure, a pressure measuring device for detecting the pressure of the filling material and each of the pressure jacks so that the pressure of the filling material matches a set pressure. And a hydraulic oil supply amount control means for uniformly adjusting the hydraulic oil supply amount.

In the second invention, a shield propelled according to excavation of the tunnel, a segment assembled in a ring shape along the excavation surface of the tunnel, and a shield propelling the shield by taking a supporting reaction force from the segment. A jack, a filler supply pipe for charging and placing filler between the segment and the excavation surface, and a plurality of pressurizers arranged in parallel with the shield jack on the shield to press the filler through a press ring. In a tunnel lining construction device including a pressure jack, a pressure measuring device that detects the pressure of the filling material, and a multi-flow hydraulic pump unit that supplies the same amount of hydraulic oil in parallel to each pressure jack. , The amount of hydraulic oil supplied from the multi-flow hydraulic pump unit so that the pressure of the filler matches the set pressure And a hydraulic oil supply amount control means for controlling.

In the third invention, the press ring is provided with an inlet into which the filler supply pipe is slidably inserted, and the tip of the supply pipe is projected from the press ring into the filler when the filler is charged. I did it.

[0016]

In the first aspect of the invention, the stroke speed of each pressure jack is controlled by adjusting the supply amount of hydraulic oil, so that the filling material is uniformly pressed all around. Therefore, it is not necessary to set the pressure for each pressure jack, and the configuration of the control system can be simplified.

In the second aspect of the invention, since the same amount of hydraulic oil is supplied to each pressure jack by the multi-flow type pump unit and the strokes of all the pressure jacks are controlled to be the same, the pressure jacks are different. It becomes unnecessary to set the pressure, and the press ring supported by each pressure jack is displaced at the same stroke at each support point, so that the press ring can be uniformly pressed while preventing distortion of the press ring.

According to the third aspect of the invention, the filler supply pipe is pushed out from the press ring into the filler that has already been charged and has not been solidified, so that the newly charged filler pushes the existing filler in all directions. , The filler can be evenly distributed to the place away from the filler supply pipe. If the filler supply pipe is slid and retracted, the contact with the cured filler can be cut off, so that there is no hindrance to the placement of the filler.

[0019]

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

In FIG. 1, the shield 1 has a cylindrical shape as in the conventional example, is arranged behind a not shown excavator, and is shielded by a shield jack 2 (see FIG. 11) as the excavator advances. Be promoted. The shield 1 supports the excavated surface 31 of the natural ground 30 before lining and prevents collapse and the like.

An inner cylinder 1B is coaxially formed on the tail portion 1A at the rear of the shield 1. A plurality of jack chambers 4 are defined by the inner cylinder 1B and a partition wall (not shown) that divides the inner peripheral surface of the tail portion 1A in the circumferential direction, and each jack chamber 4 has a pressure jack 5 and a shield jack 2 respectively.
Is arranged in parallel with. Note that the stroke of these pressure jacks 5 is generally shorter than the stroke of the shield jacks 2, and the pressure jacks 5 apply pressure to the poured concrete during one stroke of the shield jacks 2 as will be described later. The stroke for this is performed over several strokes.

A doughnut-shaped press ring 6 having a width slightly narrower than the distance between the tail portion 1A and the inner cylinder 1B is supported at the tip of these pressure jacks 5.
Via, the filler such as concrete, which is put in the rear of the press ring 6, is pressurized. In the present embodiment,
Although concrete was used as the filler, the filler is not limited to concrete, and other materials such as mortar may be used.

The precast concrete panel 12 is a member curved in an arc shape and is connected in a ring shape through a reinforcing member to form the segment 10. This segment 10 is arranged inside the inner cylinder 1A, and as the construction of the tunnel progresses, a new precast concrete panel 12 is added and extended forward to form the inner peripheral surface of the completed tunnel.

The space surrounded by the segment 10 behind the press ring 6 and the excavated surface 31 of the natural ground 30 becomes a filling space 11 into which concrete is poured. As shown in FIG. 2, the concrete is supplied to the filling space 11 from the concrete supply pipe 7 that opens rearward through the press ring 6.
It is placed inside. As shown in FIG. 1, the concrete poured into the filling space 11 is pressurized by the pressure jack 5 via the press ring 6 to improve the filling property. In this case, a lip 1C is provided in the annular gap between the segment 10 and the inner cylinder 1B to prevent concrete from leaking forward.

The concrete supply pipe 7 is connected to a concrete pump (not shown), and as shown in FIG.
Introducing cylinder 8 with the supply port 7A side opened in the press ring 6
It is slidably inserted in. As a result, the concrete can be poured and poured in such a manner that the concrete is already poured and poured into the interior of the concrete. The introduction tube 8 is formed so that its inner diameter is slightly larger than the outer diameter of the concrete supply pipe 7, and the introduction hole 6B of the press ring 6 is formed.
Then, they are fitted and fixed so as not to project to the filling space 11 side. An annular packing 8A is provided between the introduction cylinder 8 and the concrete supply pipe 7 to prevent concrete from leaking out.

The pressure jack 5 is a multi-flow pump 2
A switching valve 23 that switches the direction of the hydraulic pressure supplied from 2 causes expansion or contraction. This multi-flow pump 22
Is to feed the hydraulic oil of the same flow rate to the plurality of pressure jacks 5, and therefore the plurality of pressure jacks 5 all perform the same amount of stroke displacement.
The multi-flow pump 22 is driven by a motor 20. As a means for controlling the amount of hydraulic oil supplied from the multi-flow pump 22, an inverter or a stepless motor for controlling the rotation speed of the multi-flow pump 22 or the rotation speed of the motor 20 is used. A rotation control device 21 including a transmission is provided.

The pressing surface 6 of the filling space 11 of the press ring 6
A concrete pressure measuring device 9 (for example, an earth pressure gauge) is provided at A. The pressure of the poured concrete measured by the concrete pressure measuring device 9 is constantly input to the control unit 30, and the control unit 30
The rotation control device 21 is commanded to control the amount of hydraulic oil supplied from the multi-flow pump 22 so that the measured pressure does not exceed the set pressure.

According to the present invention, the pressure jack 5 adjusts the pressure of the concrete placed behind the press ring 6 while the shield jack 2 is propelled. That is, when the concrete is placed while the press ring 6 is pulled forward to form a new filling space 11, the pulling speed of the pressure jack 5 is adjusted to control the concrete pressure to a predetermined value. The pressing control for press-filling the concrete placed during the pulling control while pushing the press ring 6 by the pressing jack 5 is alternately performed according to the extension and contraction of the pressing jack 5. It is like this.

Next, the procedure of the tunnel lining construction method according to the present invention will be described with reference to the flowcharts of FIGS. 6 to 11. The process by the control unit 30 according to this flowchart is repeated at regular intervals.

FIG. 6 shows one of the lining constructions according to the invention.
It is a flowchart which shows the whole procedure for a step. In this step 60, the segment 10 is assembled, and in the subsequent steps, one-stage lining construction is performed for the assembled segment 10.

After the concrete pump is turned on and the concrete pouring is started in step 61, the first pulling control is performed in step 62. This pulling control is continued until it is confirmed in step 63 that the pressure jack 5 reaches the pulling limit and the concrete pump is turned off as shown in the flowchart of FIG. 8. Therefore, at the time of starting the shield propulsion in the next step 64, the pressure jack 5 is in a fully contracted state, and the push control can be started.

In step 64, the shield propulsion is started, and the speed adjustment of the shield jack 2 in step 65 and the pressure adjustment of the placing concrete in step 66 are performed until the propulsion length of the shield jack 2 reaches the full stroke and reaches the limit. Repeated. The pressure adjustment in step 66 is performed by selecting pulling control and pushing control depending on whether or not concrete is being poured, and the procedure is shown in the flowchart of FIG. 7 described later.

When it is judged in step 67 that the propulsion length of the shield jack 2 is the limit, steps 65 to 67 are executed.
, The press ring is stopped and the concrete pump is turned off in step 68, the propulsion of the shield 1 is ended in step 69, and the one-stage lining construction is ended.

FIG. 7 is a subroutine showing the procedure of pressure adjustment in step 66 of FIG. This step 7
1, it is determined whether or not the concrete pump is on. If it is on (that is, during concrete pouring), the pulling control of step 72 is performed. If it is off, the pushing control of step 73 is performed. It returns to the whole flow of.

That is, by the pressure adjustment of FIG. 7, the pull control and the push control are selected and repeated in the loop of steps 65 to 67 of the overall flow of FIG.

FIG. 8 is a subroutine showing the procedure of pulling control in step 71 of FIG. This step 8
At 1, the pulling of the press ring 6 by the pressure jack 5 is started, and subsequently, at step 82, the pressure control 1 is performed. This pressure control 1 uses a pressure jack 5 so that the concrete pressure in the pulling control matches the set pressure.
Control the stroke displacement speed, and the procedure thereof is shown in the flowchart of FIG. 9 described later.

In step 83, the pressure jack 5
It is judged whether or not the pressure has reached the pulling limit, and if it has not reached the pulling limit, the flow returns to the pressure adjustment flow of FIG.

On the other hand, if the pulling limit is judged in step 83, pulling of the press ring 6 is stopped in step 84, and the concrete pump is turned off in step 85 to finish the concrete pouring. Therefore, in the next process in the pressure adjustment subroutine of FIG. 7, the push control is performed.

FIG. 9 is a subroutine showing the procedure of the pressure control 1 in step 82 of FIG. In this step 91, the pressure of the poured concrete measured by the concrete pressure measuring device is compared with the set pressure that has been input to the control unit 30 in advance.

When the concrete pressure is lower than the set pressure, the routine proceeds to step 92, where the stroke displacement speed of the pressure jack 5 is reduced. On the other hand, when the concrete pressure is larger than the set pressure, the routine proceeds to step 93, where the stroke displacement speed of the pressure jack 5 is accelerated. When the concrete pressure matches the set pressure, the stroke displacement speed of the pressure jack 5 remains the same and the process returns to the process of FIG.

FIG. 10 is a subroutine showing the push control procedure in step 72 of FIG. In step 101, the pressing of the press ring 6 by the pressure jack 5 is started, and subsequently, in step 102, the pressure control 2 is performed. This pressure control 2 controls the stroke displacement speed of the pressure jack 5 so that the concrete pressure in the push control matches the set pressure, and the procedure is shown in the flowchart of FIG. 11 described later.

In step 103, it is judged whether or not the pressure jack 5 has reached the effective full stroke and has reached the push limit, and if it has not reached the push limit yet, the flow returns to the pressure adjustment flow of FIG. Return to the whole flow.

On the other hand, if it is determined in step 103 that the pressing limit is reached, the pressing of the press ring 6 is stopped in step 104, and the concrete pump is turned on in step 105 to start pouring concrete. Therefore,
In the next process of the pressure adjustment subroutine of FIG. 7, pull control will be performed.

FIG. 11 is a subroutine showing the procedure of the pressure control 2 in step 102 of FIG. In this step 111, the pressure of the poured concrete measured by the concrete pressure measuring device is compared with the set pressure input to the control unit 30 in advance. If the concrete pressure is smaller than the set pressure, the process proceeds to step 102 to add the pressure. The stroke displacement speed of the pressure jack 5 is increased. On the other hand, when the concrete pressure is higher than the set pressure, the routine proceeds to step 113, where the stroke displacement speed of the pressure jack 5 is reduced. When the concrete pressure matches the set pressure, the stroke displacement speed of the pressure jack 5 remains the same and the process returns to the process of FIG.

Next, the operation will be described.

The tunnel lining is constructed by excavating the natural ground 30 in front of the tunnel with an excavator and using the shield 1 as a segment 1.
Filling material (concrete in this example) is filled to the rear while propelling it to the front of 0.

When the shield jack 2 for propelling the shield 1 has reached the full stroke, one stage of the lining construction is completed, and the shield jack 2 is contracted toward the front end of the shield 1 and is already assembled and inside thereof. By adding a new precast concrete panel 12 in front of the segment 10 where the lining made of cast concrete is constructed,
Assembly for extending the segment 10 is performed. The assembly of the segment 10 is performed until the tip of the extended segment 10 reaches the rear end of the shield jack 2 which is contracted, that is, for one stroke of the shield jack.

When the assembly of the segment 10 is almost completed, as shown in FIG. 3, the pressure jack 5 is contracted and the press ring 6 is pulled out to the front, and the hardened portion 11a made of hardened concrete placed in the previous stage. A new filling space 11 is formed in front of the concrete supply pipe 7
From here, new concrete is poured into the filling space 11.

During this concrete pouring and placing,
As shown in FIG. 4, the contraction speed (pulling speed) of the pressure jack 5 is adjusted to an appropriate value by the first pulling control, and the pressure of the poured concrete is kept at a predetermined value. This first pulling control is performed by the shield 1 described later.
Is the same as the pulling control for the second and subsequent times after the start of the propulsion, and the shield 1 is not propelling.

Now, when the pressure jack 5 is fully contracted and reaches the pulling limit, the concrete pouring is stopped,
Then, the shield jack 2 (not shown) is operated to propel the shield 1 forward. At this time, the assembly of the segment 10 has already been completed, and the rear end of the shield jack 2 is supported at the tip of the segment 10.

Here, the pressure jack 5 is switched from contraction to extension by the switching valve 23, and this time, as shown in FIG. 5, the pressure jack 5 is extended in the direction opposite to the propulsion of the shield 1, As shown, the first pressing control for pressurizing the poured concrete to a predetermined pressure is performed.

At this time, the pressure jack 5 is once shrunk by the first pulling control, and the unfilled concrete is placed in the filling space 11, so that the shield 1 is started to be propelled. At the same time, the pressure jack 5 can be operated in the extension direction, and the stroke of the pressure jack 5 can be synchronized with the stroke of the shield jack 2.

In this pushing control, the pressure of the cast concrete is controlled by the control unit 30 via the concrete pressure measuring device 9 (for example, earth pressure gauge) installed at a predetermined position on the pressing surface 6A of the press ring 6. The rotation control means 21 (operating oil supply amount control means) is constantly monitored so that the concrete pressure does not exceed the set pressure.
Thus, the amount of hydraulic oil supplied from the multi-flow pump 22 is adjusted, and the extension speed (push speed) of the pressure jack 5 is controlled to an appropriate value.

Specifically, if the concrete pressure is higher than the set pressure, the pressing speed of the pressure jack 5 is reduced to limit the pressure applied to the press ring 6 by the pressure jack 5, while If the concrete pressure is lower than the set pressure, the pulling speed of the pressure jack 5 is increased to increase the pressure applied to the press ring 6 by the pressure jack 5.

After the pressing limit at which the pressure jack 5 is fully extended to the full stroke, the second pulling control is continuously performed while pouring and placing concrete again. In the second and subsequent pulling controls, the shield jack 2 extends and the shield 1 continues to propel. At this time, generally shield 1
Since the pace of concrete pouring is faster than the propulsion speed of, the pressure jack 5 forms the filling space 11 required for concrete pouring while performing pulling control.

Also in this pulling control, as in the case of the push control, the rotation control means 21 uses the multi-flow pump so that the pressure of the poured concrete monitored via the concrete pressure measuring device 9 does not exceed the set pressure. The amount of hydraulic oil supplied from 22 is adjusted, and the contraction speed (pulling speed) of the pressure jack 5 is controlled to an appropriate value.

Specifically, if the pressure of the concrete is higher than the set pressure, the pulling speed of the pressure jack 5 is increased to fill the filling space 11 with respect to the poured concrete.
Of the press ring 6 by the pressure jack 5
To limit the pressurization. On the other hand, when the concrete pressure is lower than the set pressure, the pulling speed of the pressure jack 5 is reduced to fill the filling space 11 for the poured concrete.
The amount of pressure generated by the pressure jack 5 is reduced to increase the pressure applied to the press ring 6.

By this second pulling control, the pressure jack 5
When reaches the pulling limit, the concrete pouring and placing is interrupted, and then the second push control is performed. In this way, until the propulsion length of the shield jack 2 reaches the limit, the push control and the pull control after the third time are repeatedly performed, and the concrete is placed and pressed inside the segment 10.

As described above, the push control and the pull control of the pressure jack 5 according to the present invention are performed by the multi-flow pump 2.
It is performed by adjusting the stroke speed of the pressurizing jacks 5 via 2, that is, by adjusting the amount of hydraulic oil supplied from the multi-flow pump 22.
Since it is not necessary to set the pressure for each, the entire control device can be simplified.

Further, since the stroke amount of each pressure jack 5 supporting the press ring 6 at each point on the circumference is the same, the stroke displacement amount at each point on the circumference of the press ring 6 is the same. Therefore, the press ring 6 is prevented from being distorted and the verticality is maintained.

On the other hand, the supply port 7A of the concrete supply pipe 7 for pouring and placing concrete slides with respect to the introduction port 8 and penetrates the press ring 6 as shown in FIG. It can be projected to be buried inside unconsolidated concrete. Therefore, the newly poured concrete is press-fitted into the previously poured concrete, and the existing concrete is extruded in all directions by the new concrete.

As a result, when the supply port 7A of the concrete supply pipe 7 is fixed to the press ring 6, the poured concrete is evenly distributed to a place apart from the supply port 7A which was difficult to spread. Therefore, each pressure jack 5
The uniformity of the pressure of the poured concrete is enhanced at each of the locations where the is placed.

Further, the concrete extruded in the direction of the press ring 6 is always in close contact with the press ring 6 and is strongly pressed against the pressing surface 6A in combination with the pressing pressure by the press ring 6, so that the filling property is enhanced. Therefore, it is not necessary to equip a plurality of concrete supply pipes 7 in order to enhance the filling property of the concrete near the press ring 6.

The concrete supply pipe 7 is slidable with respect to the press ring 6 and is buried inside the concrete when the concrete is poured. However, when the concrete is hardened, the supply port 7A contacts the hardened portion 11a. Since it is pulled back so that it does not come into contact with it, there is no obstacle to the injection and placement of new concrete.

When the shield jack 2 reaches the limit of the propulsion length by the above process, the concrete injection is stopped, the segment 10 is assembled further forward, and then the above process is performed again. The tunnel lining construction is repeated.

As described above, according to the present invention, it is possible to fill the poured concrete without excess or deficiency with a simple structure and to make the filling property uniform, so that the hardened portion 11a made of hardened concrete can be formed. It can be of good quality.

[0067]

According to the first aspect of the invention, since the pressure of the filling material is controlled to the set pressure by adjusting the stroke speed of each pressure jack, it is not necessary to set the pressure for each pressure jack. The entire device can be simplified and the cost can be reduced.

According to the second invention, since the same amount of hydraulic oil is supplied to each pressure jack by the multi-flow type pump unit and the strokes of all the pressure jacks are controlled to be the same, the pressure jacks are controlled. It is not necessary to set the pressure for each device, which simplifies the device and reduces costs.
The press ring supported by each pressure jack can be displaced with the same stroke at each support point to prevent the press ring from being distorted or damaged.

According to the third aspect of the invention, since the filler supply pipe is slidably supported by the press ring, it is necessary to project the tip of the filler supply pipe so as to be buried in the filler which has already been charged and has not been solidified. The newly introduced filler can push out the existing filler in all directions, so that the filler can be spread to a location away from the filler supply pipe without providing a plurality of filler supply pipes. In addition, since the filling property is improved by pressing the filling material against the press ring, it is possible to improve the uniformity of the pressure of the filling material, and if the filling material supply pipe is slid and retracted, a cured filling Since the contact with the material can be cut off, it does not hinder the placement of the filling material.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a concrete supply pipe of the same.

FIG. 3 is a cross-sectional view showing a state of pulling control according to the present invention.

FIG. 4 is a sectional view of the same.

FIG. 5 is a sectional view showing how push control is performed in the same manner.

FIG. 6 is a flowchart showing the overall procedure of a tunnel lining construction method according to the present invention.

FIG. 7 is a flow chart showing a procedure of pressure adjustment in the same manner.

FIG. 8 is a flowchart showing a pulling control procedure.

FIG. 9 is a flow chart showing a procedure of pressure control 1 in the same manner.

FIG. 10 is a flowchart showing a procedure of push control in the same manner.

FIG. 11 is a flow chart showing a state of pressure control 2 in the same manner.

FIG. 12 is a cross-sectional view showing a conventional tunnel lining construction device.

FIG. 13 is a sectional view of the same.

[Explanation of symbols]

 1 shield 2 shield jack 5 pressure jack 6 press ring 7 concrete supply pipe 8 inlet 9 concrete pressure measuring device 10 segment 21 rotation control means 22 multi-flow hydraulic pump unit 25 control unit 30 rock mass 31 excavation surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Shirai 1-2-8 Hatchobori, Chuo-ku, Tokyo Kubota Construction Co., Ltd.

Claims (3)

[Claims] 1. A shield propelled according to excavation of a tunnel, a segment assembled in a ring shape along the excavation surface of the tunnel, a shield jack for propelling the shield by taking a supporting reaction force from the segment, A filler supply pipe for charging and placing filler between the segment and the excavation surface, and a plurality of pressure jacks arranged in the shield in parallel with the shield jack to press the filler through a press ring, In a tunnel lining construction device having a pressure measuring device for detecting the pressure of the filling material, the amount of hydraulic oil supplied to each of the pressure jacks is the same so that the pressure of the filling material matches a set pressure. A lining construction device for a tunnel, characterized by comprising: a hydraulic oil supply amount control means that is adjusted dynamically. 2. A shield propelled according to excavation of a tunnel, a segment assembled in a ring shape along the excavation surface of the tunnel, a shield jack for propelling the shield by taking a supporting reaction force from this segment, A filler supply pipe for charging and placing filler between the segment and the excavation surface, and a plurality of pressure jacks arranged in the shield in parallel with the shield jack to press the filler through a press ring, In a tunnel lining construction apparatus comprising: a pressure measuring device that detects the pressure of the filling material; a multi-flow hydraulic pump unit that supplies the same amount of hydraulic oil in parallel to each of the pressure jacks; The amount of hydraulic oil supplied from the multi-flow hydraulic pump unit is controlled so that the material pressure matches the set pressure. Tunnel lining construction apparatus characterized by comprising a hydraulic fluid supply amount control means. 3. The press ring is provided with an inlet into which the filler supply pipe is slidably inserted, and the tip of the supply pipe is projected into the filler from the press ring when the filler is charged. The tunnel lining construction device according to claim 1 or 2.