JP2992006B2 - Tunnel lining back cavity filling confirmation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filling confirmation device for continuously monitoring a section until the filling of a filling material to be filled into a back cavity of a tunnel lining is completed.

[0002]

2. Description of the Related Art The backside of a tunnel lining may have a cavity due to outflow of earth and sand due to water leakage, direct erosion of water, or changes in the surrounding ground. This cavity needs to be repaired because it may cause accident such as collapse of tunnel.

[0003] One of the repair methods commonly used at present is to fill the cavity with a filler such as cement mortar or urethane foam to fill the cavity. However, this method has been pointed out to have a problem in terms of construction because a method for confirming whether or not the cavity has been reliably filled with the filler has not been determined.

For this reason, at present, a type of device is used in which a sensing sensor is installed on the ceiling portion of the cavity, and when the filler material reaches the sensing sensor, the contact is closed and a signal is emitted. Therefore, problems such as not knowing the process until the completion of filling are pointed out.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for filling a filling material in a conventional method, wherein the uncertainty of confirmation of the filling state as described above is described below. To provide a solution.

[0006]

Basically, when it is located in the cavity behind the tunnel lining, it has a certain measurement length,
A sensing portion having a mounting portion to which a mounting rod is detachably attached at one end, and a lead wire drawn from the sensing portion,
When one end is attached to the mounting portion of the sensing portion and the upper end of the sensing portion comes into contact with the ceiling of the cavity, the other end has a length protruding into the lining concrete outer surface, and when the mounting rod is inserted, A sensing part insertion pipe with a movable inner diameter for the mounting rod, a fixing jig for fixing the mounting rod and the sensing part insertion pipe when the mounting rod is inserted into the sensing part insertion pipe, and measuring the sensing of the sensing part The present invention provides a device for confirming the filling of the backside cavity of a tunnel lining, which comprises a recording device.

[Operation] Since the sensing unit of the tunnel lining back cavity filling confirmation device thus constructed has a fixed measuring length, it is installed by bringing the tip of the sensing unit into contact with the ceiling of the cavity. It is possible to continuously monitor the state until the filling is completed within the range of the measurement length, which is extremely effective in terms of management.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sensing part has a certain measuring length, is composed of a mounting part and a lead wire, and is selected according to a material of a filler. Generally, the size of the cavity on the back of the lining is
Since the width is as large as several centimeters to several meters, it is inefficient to arrange sensing parts having different measurement lengths according to the size of the cavity. Generally, filling confirmation is 30 ~
Considering that it is sufficient for construction management if it can be confirmed from a position of about 40 cm, the measurement length is about 30-40.
A centimeter is appropriate.

Since the sensing portion is eventually buried, it is desirable that the sensor portion be made of a material having a simple structure and low cost.
For example, when using cement mortar as a filler,
A capacitance type or a TDR type using the dielectric constant of water in the cement mortar can be considered. In addition, in the case of a filler having an electric insulator and a small dielectric constant, such as urethane foam, it is difficult to directly detect the electric conductivity directly. is there.

Hereinafter, a specific embodiment of the present invention will be described with reference to an example of a pressure sensing type sensing unit.

FIG. 1 is a partially cutaway front view of a sensing unit, and FIG.
Is an enlarged cross-sectional view taken along the line AA in FIG. 1, FIG. 3 is a side view of the sensing unit, FIG. 4 is a front view of the mounting rod, FIG. 5 is a front view of the sensing unit insertion pipe, and FIG. FIG. 7 is a cross-sectional view showing the fixing jig, and FIG. 8 is a cross-sectional view showing an example of use of the fixing jig.

As shown in FIGS. 1, 2 and 3, the sensing portion 1 is covered with an insulating coating 2a except for a portion around a plate-shaped conductor 2, and a resistance wire 3 is formed in a coil shape on the outside thereof. It is wound at equal intervals, the outside thereof is covered with an electrically insulating film 4, and one end has a mounting portion 5 to which a mounting rod described later is detachably mounted. The conductor 2 and the resistance wire 3 have a fixed measurement length L when located in the cavity at the back of the tunnel lining, one end of the conductor 2 is fixed to the mounting portion 5, and the resistance wire 3 is the inner surface of the insulating film 4. It may be integrated with.
The mounting portion 5 has a cylindrical mounting recess 6 on the lower surface of which a mounting rod 8 described later is removably mounted. The lead wire 7 is drawn out from the conductor 2 or the resistance wire 3 of the sensing unit 1 through an insertion hole formed in the attachment unit 5 and can be connected to a recording device described later.

In this structure, when the sensing unit 1 is located in the back cavity of the tunnel lining and the filling material is injected into this cavity,
The coating 4 is subjected to pressure by the pressure of the filler, and the resistance of the resistance wire 3 comes into contact with the conductor 2 not covered by the insulating coating 2a. It is intended to check the filling status of. The mounting part 5 is for connecting a mounting rod 8 for pushing the tip of the sensing part 1 into contact with the ceiling of the cavity.

The mounting rod 8 is formed in a pipe shape as shown in FIG. 4 and has an outer diameter which is mounted in the mounting recess 6 of the mounting part 5 of the sensing part 1 and is easily detachable, and has one end thereof. Is attached to the mounting recess 6 of the sensing unit 1 as shown in FIGS. 9 and 10, and when the upper end of the sensing unit 1 contacts the ceiling of the cavity on the back of the tunnel lining, the other end is on the outer surface of the lining concrete. It has a protruding length.

Since the size of the cavity on the back of the lining has a wide range of height from several centimeters to several meters, it is practical to manufacture the above-described length of the sensing portion 1 according to the respective height. Instead, it is efficient to previously select and attach a plurality of connectable mounting rods 8 having a length of, for example, 50 cm or 1 meter according to the size of the cavity. Further, it is preferable that the mounting rod 8 is hollow and is a cylindrical body for guiding the lead wire 7 out of the cavity. In order to prevent leakage of the filler from the periphery of the fixing jig 11 described later, it is preferable that the fixing jig 11 is cylindrical.

As shown in FIG. 5, the sensing part insertion pipe 9 is formed of a pipe-like material, and has a screw 10 formed at one end thereof for screwing a fixing jig described later. The rod 8 has a movable inner diameter. As shown in FIG. 6, the sensing part insertion pipe 9 is installed such that the screw 10 comes out of the hole drilled in the lining concrete A. The inner diameter of the sensing part insertion pipe 9 is for guiding the sensing part 1 and the mounting rod 8 to the cavity on the back of the lining concrete.

As shown in FIG. 7, the fixing jig 11 is formed with a screw 12 which is screwed into the screw 10 of the sensing part insertion pipe 9, and a mounting rod insertion hole 16 is pierced to form a blind lid 13.
And a cable connector 15 to which a rubber packing 14 is attached. As is well known, the cable connector 15 has a fixed portion 15a and a rotating portion 15b screwed together with a screw to be integrated. As shown in FIG. 8, a fixing jig 11 is attached to the sensing portion insertion pipe 9 and the mounting rod 5 inserted into the sensing portion insertion pipe 9, and a screw 10 formed on the sensing portion insertion pipe 9 and a blind lid are provided. 13
And the rotating portion 15b of the cable connector 15 is rotated and fastened and fixed.

The recording device 17 has an electric resistance of a circuit constituted by the resistance wire 3 of the sensing unit 1 shown in FIG. Can be sequentially measured, monitored, and recorded. The power supply unit, the display unit, and the control unit of the sensing unit 1 are also used. It is also preferred that all operations can be performed here.

The tunnel lining back cavity filling confirmation device according to the present invention comprises the above-described components and is used as follows. Note that each part is not limited to the example described above.

FIGS. 9 and 10 are schematic views showing an example of the construction of the tunnel lining back cavity filling confirmation device according to the present invention. Here, FIG. 9 shows a case where the cavity between the lining concrete A and the mountain B is large, and FIG. 10 shows a case where the cavity between the lining concrete A and the mountain B is small. In the above example, since the sensing unit 1 has a fixed length, the mounting rods 8 having different lengths are prepared.

First, a hole is inserted into the lining concrete A through which the sensing part insertion pipe 9 penetrating from the outer surface to the cavity C is inserted, and the sensing part insertion pipe 9 is wound around the hole with a cloth or the like, and the wedge is inserted. Fix with etc. The reason why the sensing part insertion pipe 9 is wound with a cloth or the like is to prevent the filled filler from leaking.
Next, a mounting rod 8 is attached to the sensor 1 via a mounting recess in a mounting portion 5 formed at one end of the sensor 1, and the sensor 1 is inserted into the sensor insertion pipe 9, and the sensor 5 detects the light. Push up until the tip of part 1 reaches the ceiling of cavity C. When the tip of the sensing portion 1 reaches the ceiling, the mounting rod 8 is fixed to the sensing portion insertion pipe 9 using the fixing jig 11. The lead wire 7 drawn from the sensing unit 1 is connected to the recording device 17 via the mounting rod 8 and the inside of the sensing unit insertion pipe 9. In this way, the preparation for checking the filling of the filler is completed.

Next, a filling material, for example, urethane foam, is filled into the cavity through a filling hole of the filling material appropriately provided in the lining concrete. In the case of urethane foam, when the pressure due to the filling amount or the pressure during foaming reaches the sensing unit 1, the sensing unit 1
Under the pressure, the resistance wire 3 comes into contact with the conductor 2 in a portion not covered with the insulating coating 2a through the insulating film 4 sequentially from below. The recording device 17 monitors and records the electrical resistance of the circuit formed by the resistance wire contacting the conductor, thereby confirming the filling state.

When the filling of the filling material into the cavity C is completed, the mounting rod 8 is pulled out from the sensing part insertion pipe 9. At this time, the sensing portion 1 is buried in the filler by solidification of the filler filled in the cavity C.

Further, the sensing part insertion pipe 9 attached to the hole drilled in the lining concrete is also removed, and the cutout is closed with the joint material.

In this embodiment, the sensing portion is formed by winding a resistance wire around the conductor so as not to contact the conductor and electrically insulating coating the outside of the resistance wire. Is an electrical insulator and has a small dielectric constant, the filling state can be sensed by the pressure at the time of filling.

The present invention has the following effects because it is configured as described above.

According to the first aspect, the sensing unit has a fixed measuring length, and sequentially informs the recording device via a lead wire of the filling state of the filler filled in the cavity on the back of the concrete lining to the recording device. Therefore, the filling state of the filler filled in the cavity can be continuously monitored within the range of the measurement length until the filling is completed, which is very effective in terms of construction management.

Further, the sensing part is inserted into the sensing part insertion pipe installed in the hole drilled in the lining concrete by using a mounting rod, and is pushed into the cavity on the back of the concrete lining, and the mounting rod is fixed by a fixing jig. Because it is fixed,
The measurement length can be limited to a length necessary for construction management, and the cost is very economical.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a sensing unit.

FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG.

FIG. 3 is a side view of a sensing unit.

FIG. 4 is a front view of a mounting rod.

FIG. 5 is a front view of a sensing part insertion pipe.

FIG. 6 is a cross-sectional view in which a sensing part insertion pipe is positioned on lining concrete.

FIG. 7 is a sectional view of a fixing jig.

FIG. 8 is a cross-sectional view showing a state where the sensing part insertion pipe and the mounting rod are fixed by a fixing jig.

FIG. 9 is a schematic diagram showing a construction example of a tunnel lining back cavity filling confirmation device.

FIG. 10 is a schematic view showing another example of construction of the tunnel lining back cavity filling confirmation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detecting part 2 Conductor 2a Insulating coating 3 Resistance wire 4 Insulating film 5 Mounting part 6 Mounting unevenness part 7 Lead wire 8 Mounting rod 9 Detecting part insertion pipe 10 Screw 11 Fixing jig 12 Screw 13 Blind lid 14 Rubber packing 15 Cable connector 16 Mounting rod insertion hole 17 Recording device A Concrete lining B Mountain C Hollow

Claims (1)

(57) [Claims] 1. A sensing portion having a fixed measuring length and a mounting portion to which a mounting rod is detachably attached at one end when positioned in a cavity at the back of a tunnel lining, and a lead wire pulled out from the sensing portion. When one end was attached to the mounting portion of the sensing portion and the upper end of the sensing portion came into contact with the ceiling of the cavity, the other end protruded to the outside of the lining concrete, and the mounting rod was inserted. When, the mounting rod has a movable inner diameter of the sensing part insertion pipe,
When a mounting rod is inserted into a sensing part insertion pipe, a fixing jig for fixing the mounting rod and the sensing part insertion pipe, and a recording device for measuring the sensing of the sensing part, the back surface of the tunnel lining. Cavity filling confirmation device.