JP2003056286A - Measuring device of back-filling injection pressure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a measuring device of back-filling injection pressure which can measure the true injection pressure of a back-filling material in a tail void, in other words, which enables direct measurement of the injection pressure of the back-filling material in the tail void. SOLUTION: A pressure gage 2 and an elastic film material 3 so provided as to cover the front of the pressure gage 2 are provided at an end plate 6a in the rear part of a back-filling injection device 6 provided in the tail part of a shield machine, so that the pressure of injection of the back-filling material into the tail void can be measured directly. A rod-like member 4 and an expanding-contracting device 5 making the rod-like member 4 reciprocate in the direction of the axis of a rod are connected to the pressure gage 2 and the edge end part of the elastic film material 3 is fixed to the end plate 6a, while the central part thereof is fixed to the pressure gage 2. The shape of the elastic film material 3 is changed by the expanding-contracting device 5 and thereby the back-filling material fixed to the elastic film material 3 can be peeled off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing injection pressure measuring device for measuring an injection pressure of a backing material injected into a tail void when a tunnel is constructed by a shield method.

[0002]

2. Description of the Related Art When constructing a tunnel by a shield construction method, a tunnel lining is constructed by assembling segments in a shield machine, and is exposed to the ground as the shield machine advances. At this time, between the tunnel lining and the ground,
Shield machine skin plate thickness, tail clearance (difference between shield machine skin plate inner diameter and segment ring outer diameter) and tail voids (voids) by the excess
Occurs. If this tail void is left unattended, it will deform the surrounding ground and cause subsidence of the ground surface.
Back-filling injection is usually performed to inject the back-filling material into the tail void.

Backfill injection depends on the injection position and the injection timing.
Simultaneous injection of the backfill material from the backfill injection hole provided in the tail of the shield machine at the same time when the tail void occurs, and half injection of the backfill material from the injection hole provided in the segment when the segment comes off the tail. It is classified into simultaneous injection, immediate injection that is injected from the injection hole of the segment after the completion of excavation for one ring, backward injection that is injected from the injection hole of the segment after several rings, and the like.

As the backing material, various materials such as those in which materials are mixed in advance such as mortar, and those in which the main material and the hardening material are mixed just before injection to be plastic or consolidated, The thing of the property is used.

As described above, there are various kinds of backfilling methods, timings, and properties of the backfill material. In any case, the backfill material is measured by measuring at least one of the backfill material injection amount and the injection pressure. It is common to manage infusions.

When the backfill injection is controlled by the injection pressure of the backfill material, as shown in FIG. 12, the pressure provided in the pipe 31 from the injection pump 32 to the backfill injection hole 33 in the tunnel pit. Measured with a total of 30 and pressure gauge 3
It is general to manage the backfill injection by estimating the injection pressure of the backfill material in the tail void in consideration of the pressure loss in the pipe 31 from 0 to the backfill injection hole 33.

[0007]

However, it is estimated based on the pressure value in the middle of the pipe (indirectly measured).
Since the injection pressure value of the backfill material in the tail void is different from the true (directly measured) injection pressure value of the backfill material in the tail void, the back pressure based on the pressure value measured during piping as described above is used. In the case of controlling the injection, the amount of backing material injected into the tail void may be excessive or insufficient. If the amount of backing material injected is insufficient, it will cause ground subsidence, and if the amount of backing material injected is too large, it will cause uplift and segment deformation on the ground surface, and the amount of backing material used will increase, resulting in an increase in construction costs. .

From this point of view, the present invention is capable of measuring the true backfill material injection pressure in the tail void, that is, the backfill injection capable of directly measuring the backfill material injection pressure in the tail void. The purpose is to propose a pressure measuring device.

[0009]

In order to solve the above-mentioned problems, the invention as set forth in claim 1 is a pressure installed on the end plate at the rear part of the back-filling injection device provided at the tail part of the shield machine. A backfill injection pressure measuring device comprising: a pressure gauge and an elastic film material covering the front surface of the pressure gauge.

According to the backfill injection pressure measuring device having such a configuration, since the pressure gauge is in direct contact with the backfill material injected into the tail void through the elastic film material, the true injection pressure of the backfill material is It can be measured. Further, since the front surface of the pressure gauge is covered with the elastic film material, the backing material and the earth and sand do not adhere to the pressure gauge.

According to a second aspect of the present invention, there is provided a pressure gauge installed on an end plate at a rear portion of the backfill injection device provided at a tail portion of the shield machine, and an elastic film material provided on a front surface of the pressure gauge. A rod-shaped member connected to the pressure gauge; and an expansion / contraction device for reciprocating the rod-shaped member in the rod axial direction. The elastic film material has an edge fixed to the end plate, and a central portion of the elastic film. When the pressure gauge is reciprocated in the rod axial direction by the expansion / contraction device via the rod-shaped member by the expansion / contraction device, the central portion of the elastic film material is in the rod-like shape in conjunction with the reciprocation of the pressure gauge. The backfill injection pressure measuring device is characterized in that it reciprocates in the rod axis direction of the member.

According to the back-filling injection pressure measuring device having such a structure, when the pressure gauge is reciprocated in the rod axis direction by the expansion / contraction device via the rod-shaped member, it is interlocked with the reciprocation of the pressure gauge. The central portion of the elastic film material reciprocates in the rod axis direction of the rod member. At this time, since the outer edge portion of the elastic film material is fixed to the end plate, the elastic film material is deformed into a conical shape (a U-shaped cross section). Thereby, when the backing material is fixed to the elastic film material, the fixed backing material can be separated from the elastic film material.

A third aspect of the present invention is a backing injection pressure measuring device for measuring the injection pressure of the backing material by inserting the check valve into the backing injection hole of the segment to which the check valve is attached.
A base part mounted so as to close the backfill injection hole, a push-up part projecting from the base part and opening the check valve, and a pressure gauge having a pressure-receiving part housed in the push-up part. It is a characteristic back-filling injection pressure measuring device.

According to the back-filling injection pressure measuring device having such a configuration, since the check valve opens in the natural direction by the push-up portion, the back-filling material injected into the tail void enters the inside of the back-filling injection hole. Inflow. Since the check valve opens and the inside of the backfill injection hole communicates with the tail void, the pressure of the backfill material that has flowed into the backfill injection hole is injected into the tail void. Equals pressure. Therefore, by measuring the pressure of the backfill material that has flowed into the backfill injection hole with the pressure gauge, a pressure equal to the injection pressure of the backfill material that is injected into the tail void can be measured. Since the back-filling injection hole is closed by the base portion,
Backfill material and groundwater will not be ejected into the tunnel mine.

According to a fourth aspect of the present invention, the base portion has a cylindrical shape and has a male screw portion that is screwed into the female screw portion of the back-filling injection hole, and the push-up portion is formed from a valve body of the check valve. Also has a small diameter and is slidably and rotatably attached to the base portion, the push-up portion is inserted into the back-filling injection hole, and the female screw portion of the back-filling injection hole and the male screw portion of the base portion are screwed together. The back-filling injection pressure measuring device according to claim 3, wherein the push-up portion opens the check valve when combined.

According to the backfill injection pressure measuring device having such a configuration, the male screw portion formed on the cylindrical base portion is screwed into the female screw portion of the backfill injection hole, whereby the base portion is backfilled. Since the check valve can be inserted into the injection hole, and the check valve is opened in the natural direction by the push-up portion, the backing material injected into the tail void flows into the backing injection hole.
Since the check valve opens and the back-filling injection hole and the tail void communicate with each other, the pressure of the backing material flowing into the back-filling injection hole blocked by the base portion is injected into the tail void. It becomes equal to the injection pressure of the filling material. By measuring the pressure of the backfill material that has flowed into the backfill injection hole with the pressure gauge, a pressure equal to the injection pressure of the backfill material that is injected into the tail void can be measured.

According to a fifth aspect of the invention, a backfill injection pressure measuring device according to the fourth aspect is characterized in that a rotating mechanism for rotating the base portion is provided on the other end side of the base portion. Is.

Since the back-filling injection pressure measuring device having such a structure is provided with the rotating mechanism for rotating the base portion, it can be easily attached to and removed from the back-filling injection hole.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the description, the same elements will be denoted by the same reference symbols, without redundant description.

(First Embodiment) A backfill injection pressure measuring device according to a first embodiment will be described in detail with reference to FIGS. 1 to 5.

As shown in FIG. 1, a backfill injection pressure measuring device 1
Is installed inside the backfill injection device 6 installed in the tail portion 20b of the shield machine 20.

As shown in FIGS. 2 (a) and 2 (b), the backfill injection pressure measuring device 1 includes a pressure gauge 2 inserted into an end plate 6a at the rear end of the backfill injection device 6 and a pressure gauge 2. The elastic film member 3 is provided on the front surface of the rod 3, a rod-shaped member 4 connected to the pressure gauge 2, and an expansion / contraction device 5 that reciprocates the rod-shaped member 4 in the rod axis direction.

The pressure gauge 2 measures the injection pressure of the backing material 22 (see FIG. 1). As shown in FIG. 3 (a), the pressure gauge 2 can reciprocate in a circular hole provided in the end plate 6a. It is inserted and attached, and its rear end is connected to the rod-shaped member 4. In this embodiment, the pressure gauge 2 is housed in the cylindrical jig 2b and is connected to the rod-shaped member 4 via the jig 2b. Further, since the pressure gauge 2 is inserted through the jig 2b so as to slide in the end plate 6a, the pressure gauge 2 does not shift during pressure measurement. Further, an O-ring 2d is attached to the jig 2b for stopping water. In this embodiment, a wall-type pressure gauge is used, but an optimal type is selected according to the backfill material.

The elastic film material 3 is attached to the pressure gauge 2 by the backing material 22 (see FIG.
It is made of a rubber film material and is designed to prevent dirt and sand from adhering to it. As shown in FIGS. 4 and 5, the edge portion of the elastic film material 3 is fixed to the end plate 6a by the bolt 3a via the ring-shaped frame 3c, and the central portion is fixed to the pressure gauge 2 by the bolt 3b. There is. The elastic film material 3 is
A soft material is used so as not to hinder the transmission of pressure to the pressure receiving surface 2a of the pressure gauge 2.

As shown in FIGS. 2 (a) and 2 (b), the rod-shaped member 4 causes the reciprocating motion of the expansion / contraction device 5 installed at a position distant from the elastic film member 3 to be transmitted through the pressure gauge 2 to the elastic film. It is transmitted to the material 3 and is formed of a steel pipe. The rod-shaped member 4 is attached substantially parallel to the backfill injection pipe 31. Also, FIG.
As shown in (a) and (b), a cable 2c extending from the pressure gauge 2 is inserted inside the rod-shaped member 4 and connected to a back-filling injection control device (not shown) or the like. The rod-shaped member 4 is not limited to a steel pipe, and may be a rod-shaped member such as a bar material or channel steel.

As shown in FIGS. 2 (a) and 2 (b), the expansion / contraction device 5 includes the elastic film material 3 through the rod-shaped member 4 and the pressure gauge 2.
Is to reciprocate in the axial direction of the rod, and a hydraulic jack is used in this embodiment. Shield machine 20
Since the segments are assembled at the tail portion (see FIG. 1), the telescopic device 5 is installed near the middle trunk portion while avoiding this position. The rod 5a of the expansion / contraction device 5 is provided parallel to the rod-shaped member 4, and the starting end of the rod 5a and the end of the rod-shaped member 4 are connected via a jig 5b.

Next, a method of using the backfill injection pressure measuring device 1 configured as described above will be described with reference to FIGS. 3 (a) and 3 (b).

When measuring the injection pressure of the backing material 22 (see FIG. 1), the pressure receiving surface 2a and the elastic film material 3 are connected so that the injection pressure is reliably transmitted to the pressure receiving surface 2a of the pressure gauge 2. Make measurements in close contact. In the case of this embodiment, FIG.
As shown in (a), when the pressure gauge 2 is arranged such that the pressure receiving surface 2a is flush with the outer surface of the end plate 6a, the pressure receiving surface 2a and the elastic film material 3 are in close contact with each other. Since the pressure receiving surface 2a faces the tail void, the injection pressure of the backing material 22 can be directly measured.

When the backing material 22 adheres to the elastic film material 3 and accurate measurement cannot be performed, the expansion / contraction device 5 (see FIG. 2A).
The pressure gauge 2 is reciprocated through the rod-shaped member 4 to deform the elastic film material 3 according to the reference (1). Since the outer edge portion of the elastic membrane material 3 is fixed to the end plate 6a and the central portion is fixed to the pressure gauge 2, the elastic membrane material 3 has a conical shape (a U-shaped cross section) as the pressure gauge 2 reciprocates. ) (See FIG. 3B), and the backing material 22 fixed to the elastic film material 3 can be peeled off.

As described above, according to the backfill injection pressure measuring device 1, it is possible to directly measure the injection pressure of the backfill material 22 injected into the tail void B. Can be managed.

Further, since the elastic film material 3 is covered so that the pressure gauge 2 is not exposed to the backing material 22 or the earth and sand, the failure of the pressure gauge 2 is reduced. Further, even when the backing material 22 is fixed to the elastic film material 3 that protects the pressure gauge 2, the elastic backing material 5 can be deformed by the expansion / contraction device 5 to remove the fixed backing material 22. Therefore, the injection pressure of the backing material 22 can always be accurately measured.

Further, since the back-filling injection pressure measuring device 1 is attached by utilizing the existing back-filling injection device 6, it is not necessary to remodel the shield machine 20 on a large scale.

(Second Embodiment) A backfill injection pressure measuring device according to a second embodiment will be described in detail with reference to FIGS. 6 to 11.

As shown in FIG. 6, the backfill injection pressure measuring device 1
Reference numeral 0 indicates that the injection pressure of the backing material 22 (see FIG. 10) is measured by inserting it into the backing injection hole 21a of the segment 21. In addition, the back-filling injection hole 21a is usually installed in the segment 21 which is the tunnel lining, and
A check valve 13 is installed inside 1a so that groundwater and injected backfill material do not flow into the tunnel mine. The valve body 13a of the check valve 13 is formed by two semi-circular plates and opens and closes around the hinge portion 13b. In addition, a female screw 21b is formed on the inner surface side in order to mount a segment gripping hardware in the back-filling injection hole 21a or to mount a plug in the back-filling injection hole 21a.

As shown in FIGS. 6 and 7, the backfill injection pressure measuring device 10 pushes up the base portion 11 mounted so as to close the backfill injection hole 21a and the valve body 13a of the check valve 13. Push-up portion 12 to be opened and pressure receiving surface 2a (pressure receiving portion 2e)
Is a pressure gauge 2 housed inside the push-up section 12.

The base portion 11 is a cylindrical member that serves as the base of the backfill injection pressure measuring device 10, and has a male screw portion 11b screwed into the female screw portion 21b of the backfill injection hole 21a. Further, the base portion 11 is provided with a backfill injection hole 21 on the inner side of the tunnel.
A handle-like turning mechanism 11a is formed so as to be screwed into a. In addition, in this embodiment, an O-ring 11c is provided around the base portion 11 for stopping water, and a water-stop sheet 11d is provided between the push-up portion 12 and the O-ring 11c. Further, the central portion of the base portion 11 is hollow, and a female screw is threaded on the inner surface, although not shown.

The pressure gauge 2 measures the injection pressure of the backing material 22. In this embodiment, the pressure gauge 2 has a cylindrical pressure receiving portion 2e having a disc-shaped pressure receiving plate 2a, and a cylinder having a diameter smaller than that of the pressure receiving portion 2e. And a mounting portion 2f consisting of Further, although not shown, a male screw is threaded on the mounting portion 2f. The cable 2c of the pressure gauge 2 passes through the central portion of the base portion 11 and is connected to a back-filling injection control device (not shown) or the like. Further, an O-ring 2g is installed on the outer circumference of the pressure gauge 2 and is in close contact with the inner wall surface of the pusher 12. A wall-type pressure gauge is used, but the backing material 2
Select a pressure gauge of the most suitable type according to the properties of 2.

The push-up portion 12 is forcibly opening the valve body 13a of the check valve 13 when the back-filling injection pressure is measured. The push-up portion 12 is formed of a cylinder having a diameter smaller than that of the valve body 13a and has a tip portion. A notch 12a having a U-shaped cross section is provided to face each other. The push-up portion 12 is mounted so as to be slidable and rotatable with respect to the base body portion 11. In the present embodiment, the mounting portion 2f at the tip of the pressure gauge 2 is inserted into the circular hole formed at the center of the bottom of the push-up unit 12.
With the bottom portion of the push-up portion 12 interposed between the pressure receiving portion 2e of the pressure gauge 2 and the base portion 11, the mounting portion 2f of the pressure gauge 2 is attached to the center portion of the base portion 11 with an appropriate fastening force. The push-up portion 12 is slidably attached to the base body portion 11 by being screwed.

Next, a method of using the backfill injection pressure measuring device 10 configured as described above will be described with reference to FIGS. 8 to 10. In the following, segment 21
A case will be described as an example where semi-simultaneous injection is performed in which the backing material 22 is injected from the backing injection hole 21a provided in the segment when the tail is removed.

As shown in FIGS. 8A and 8B, the backing material 2
Prior to the injection of 2, the back-filling injection pressure measuring device 10 is inserted into the back-filling injection hole 21a of the segment 21 assembled in the tail of the shield machine 20, and the male screw portion 11b of the base portion 11 is inserted.
And the female screw portion 21b of the back-filling injection hole 21a are rotated by the rotating mechanism 11
Rotate by a and screw together.

When the back-filling injection hole 21a is exposed to the ground and the back-filling injection is started from another back-filling injection hole, as shown in FIG. 9 (a), the rotating mechanism 11a is rotated to rotate the base portion 11. Is screwed into the back-filling injection hole 21a, the push-up portion 12 is pushed up to the check valve 13 side, and the valve body 13a of the check valve 13 is forcibly pushed open to the natural side. At this time, since the hinge portion 13b of the check valve 13 is inserted into the cutout portion 12a of the push-up portion 12, the push-up portion 12 is
Does not contact the hinge portion 13b. Also,
Since the push-up portion 12 is slidably attached to the base portion 11, even if the rotation of the push-up portion 12 is blocked by the hinge portion 13b, the push-up portion 12 is inserted into the back-filling injection hole 2
The push-up portion 12 can be pushed up to the check valve 13 side by screwing it into the la 1a. Further, since the turning mechanism 11a is provided, the valve body 13a can be used even when the groundwater pressure is high.
Can be easily opened.

As shown in FIGS. 10 (a) and 10 (b), when the backfill material 22 is injected, the backfill material 22 flows into the backfill injection hole 21a from the ground side. At this time, since the tail void B communicates with the inside of the backfill injection hole 21a,
The pressure value measured by the pressure gauge 2 is the same as the true injection pressure value of the backing material 22.

The backing injection hole 21a is formed by the base portion 11.
Since the valve is closed, even if the valve body 13a of the check valve 13 is opened, the backfill material 22 and groundwater will not be ejected into the tunnel pit.

When the measurement is completed, the rotating mechanism 11a is rotated in the reverse direction to remove the backfill injection pressure measuring device 10 from the backfill injection hole 21a. At this time, the valve body 13a that has been opened naturally closes due to the pressure from the natural ground side, so that the backfill material 22, groundwater, etc. do not spout from the natural ground side into the tunnel mine.

The removed backfilling injection pressure measuring device 10 is reused at the next backfilling injection after cleaning and repair.

As described above, the backfill injection pressure measuring device 10 can also directly measure the injection pressure of the backfill material 22 injected into the tail void B, so that highly accurate backfill injection management is possible. become.

Further, it is very easy to attach / detach to / from the back-filling injection hole 21a, and the back-filling material can be removed immediately after the filling work is completed, so that it does not hinder the filling work or other work. Absent. Further, since the pressure gauge 2 and the push-up portion 12 can be removed from the base portion 11 and maintenance work such as cleaning and repair can be performed, highly reliable measurement can always be performed.

In addition, since the back-filling injection pressure measuring device 10 has a simple structure, it can be diverted, and the back-filling injection hole 21a and the check valve 13 which are normally attached to the segment can be used as they are. It is economical.

The shape of the notch 12a in the upper portion of the push-up portion 12 as described above is an example corresponding to the shape of the check valve 13 of the present embodiment, and is not limited to this. As shown in FIG. 11A, more notches 12a ′ may be formed in a U shape. Further, as shown in FIG. 11 (b), a plurality of rod-shaped members 14 may be projectingly provided on a disc 14a slidably and rotatably attached to the base portion 11 to form a push-up portion. That is, any shape may be adopted as long as the valve body of the check valve can be pushed up and the backfill material 22 can flow into the backfill injection hole 21a from the opened check valve. These may be appropriately changed in consideration of the structure of the check valve used.

In the second embodiment described above, the case where the backfill injection is performed by semi-simultaneous injection has been described as an example. However, since the backfill injection hole 21a of the segment 21 is used, simultaneous injection and immediate injection are performed. And it can be applied even in the case of posterior injection.

Further, the backfill injection pressure measuring device 10 can be applied not only to the injection pressure of the backfill material 22 but also when measuring the groundwater pressure from inside the tunnel pit.

[0052]

According to the first aspect of the present invention, the injection pressure of the backing material injected into the tail void can be directly measured, so that the backing injection can be managed with high accuracy. Further, since the elastic film material is covered so as to prevent the pressure gauge from being exposed to the backfill material or the earth and sand, the failure of the pressure gauge is reduced. Further, since the back-filling injection pressure measuring device is attached by using the back-filling injection device provided in the shield machine, there is almost no need to modify or install the shield machine.

According to the second aspect of the present invention, since the elastic film material can be deformed by the expansion / contraction device, even if the backing material is fixed to the elastic film material, the fixed backing material is fixed to the elastic film material. Can be peeled off. That is, since the pressure gauge always operates accurately, it is possible to perform injection management with high accuracy for a long period of time.

According to the inventions of claims 3 and 4,
The injection pressure of the backing material injected into the tail void can be directly measured, and maintenance work such as cleaning and repair can be easily performed by removing it, so that accurate backing injection management is always possible. It will be possible. Further, since the backing material can be removed immediately after the injection work is completed, it does not hinder the injection work and other operations.

In addition, since the back-filling injection pressure measuring device 10 has a simple structure, it can be diverted, and the back-filling injection hole and the check valve, which have been conventionally used, can be used as they are, which is very economical. Is.

According to the fifth aspect of the present invention, since the rotating mechanism is provided in the base portion of the back-filling injection pressure measuring device, it can be easily attached to and detached from the back-filling injection pressure measuring device. Further, even when the groundwater pressure is high, the valve body of the check valve can be easily opened.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an installation position of a backfill injection pressure measuring device according to a first embodiment.

FIG. 2A is an enlarged side cross-sectional view of the backfill injection pressure measuring device according to the first embodiment. (B) is an enlarged top sectional view of the same.

FIG. 3A is a side sectional view of a main part of the backfill injection pressure measuring device according to the first embodiment. (B) is a side sectional view showing a deformed state of the elastic film material.

FIG. 4 is a front view of a main part of the backfill injection pressure measuring device according to the first embodiment.

FIG. 5 is an exploded perspective view showing a method of attaching the elastic film material.

FIG. 6 is a perspective view of a backfill injection pressure measuring device according to a second embodiment.

FIG. 7 is a cross-sectional view of a backfill injection pressure measuring device according to a second embodiment.

FIG. 8 is a cross-sectional view showing a state in which the backfill injection pressure measuring device according to the second embodiment is inserted into the backfill injection hole.

FIG. 9 is a cross-sectional view showing a state at the time of measurement of the backfill injection pressure measuring device according to the second embodiment.

FIG. 10 is a cross-sectional view showing a state at the time of measurement of the backfill injection pressure measuring device according to the second embodiment.

11 (a) and 11 (b) are perspective views showing other shapes of the push-up portion.

FIG. 12 is a schematic view showing an installation position of a conventional pressure gauge.

[Explanation of symbols]

1,10 Back-filling injection pressure measuring device 2 pressure gauge 3 Elastic film material 4 Bar-shaped member 5 telescopic device 6 Backfill injection device 6a End plate 11 Base part 11a rotation mechanism 12 Oshige 13 Check valve 20 shield machine 20a skin plate 20b tail section 20c tail seal 21 segments 21a Back-filling injection hole 22 Backing material B tail void

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kotaro Kobayashi             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. F-term (reference) 2D055 BA01 JA01 JA05 JA06 LA15

Claims (5)

[Claims] 1. A pressure gauge installed on a rear end plate of a backfill injection device provided on a tail portion of a shield machine, and an elastic film material covering a front surface of the pressure gauge. Back-filling injection pressure measuring device. 2. A pressure gauge installed on the end plate at the rear of the back-filling injection device provided in the tail portion of the shield machine, an elastic film material covering the front surface of the pressure gauge, and a rod-like member connected to the pressure gauge. A member, and an expansion / contraction device for reciprocating the rod-shaped member in the axial direction of the rod, wherein the elastic film material has an edge portion fixed to the end plate and a central portion fixed to the pressure gauge, When the device reciprocates the pressure gauge in the rod axial direction through the rod-shaped member, the central portion of the elastic film material reciprocates in the rod axial direction of the rod-shaped member in conjunction with the reciprocating movement of the pressure gauge. Back-filling injection pressure measuring device characterized by moving. 3. A backing injection pressure measuring device for measuring an injection pressure of a backing material by inserting the check valve into a backing injection hole of a segment equipped with the check valve, the backing injection hole being closed. Back mounting injection pressure, comprising: a base part mounted as described above; a push-up part protruding from the base part to open the check valve; and a pressure gauge having a pressure-receiving part housed in the push-up part. Measuring device. 4. The base portion has a cylindrical shape and has a male screw portion that is screwed into the female screw portion of the back-filling injection hole, and the push-up portion has a cylindrical shape having a diameter smaller than that of the valve body of the check valve. , Which is slidably and rotatably attached to the base portion, the push-up portion is inserted into the back-filling injection hole, and when the female screw portion of the back-filling injection hole and the male screw portion of the base portion are screwed together, The backfill injection pressure measuring device according to claim 3, wherein a push-up portion opens the check valve. 5. A rotating mechanism for rotating the base portion is provided on the other end side of the base portion.
The back-filling injection pressure measuring device described.