JP7424577B2 - Temperature measuring device for concrete lining - Google Patents

Description

The present invention relates to a temperature measuring device for concrete lining, and more particularly to a temperature measuring device for concrete lining, which can also be used as a measuring pin for measuring the thickness of a concrete lining in a tunnel.

Lining concrete is injected into the pouring space formed between the outer periphery of the tunnel center frame and the tunnel inner wall. Then, a measuring pin is used to measure the thickness of the poured concrete lining. On the other hand, temperature measurement during the curing of cast lining concrete is very important in order to properly estimate the strength development of the concrete, and in order to make temperature measurement possible at all times, for example, as disclosed in Patent Document 1, Temperature measuring devices have been proposed. This temperature measuring device fixes the proximal end of the protective tube to a mounting hole provided on the circumferential surface of the frame using a connector and a frame fixing device so that the protective tube protrudes into the casting space. A temperature sensor is embedded and fixed in the tip with resin.

JP2001-13013

However, with the conventional temperature measuring device mentioned above, it is necessary to provide a dedicated mounting hole in the frame for attaching the device, and it is also necessary to remove the connecting device and frame fixing device after temperature measurement is completed (concrete curing is completed). However, since the protective tube is left buried in the cast lining concrete, there is a problem in that foreign matter remains in the concrete.

Therefore, the present invention solves these problems, and there is no need to provide a new dedicated mounting hole in the frame, and it is easy to remove even after temperature measurement is completed, and there is no possibility that foreign matter will remain in the lining concrete. The purpose of the present invention is to provide a device for measuring the temperature of concrete lining without causing any damage.

In order to achieve the above object, in the first invention, the concrete is made to protrude from the frame (12) side into the concrete placement space (S) formed between the frame (12) and the tunnel inner wall. A pin body (22) used to measure the thickness of the placed lining concrete, and a temperature measuring device provided on the pin body (22) to measure the temperature of the placed lining concrete. element (3), and the pin body (22) is a cylinder with a closed end, a mounting hole (225) is provided on the side surface of the cylinder, and the temperature measuring device is inserted into the mounting hole (225). A plug member (33) with the element (3) installed therein is press-fitted.

According to the first aspect of the present invention, since the conventionally provided mounting holes for measuring pins can be used for measuring the winding thickness, there is no need to provide new dedicated mounting holes in the formwork. After the temperature measurement is completed, the pin body can be easily removed by rotating it around its central axis and separating it from the concrete, so no foreign matter will remain in the concrete. Furthermore, in the first invention, the temperature inside the lining concrete poured into the pouring space can be controlled.

The above reference numerals in parentheses indicate for reference the correspondence with specific means described in the embodiments to be described later.

As described above, according to the concrete lining temperature measuring device of the present invention, there is no need to provide a new dedicated mounting hole in the frame, and it is easy to remove even after temperature measurement is completed, and it can be installed inside the concrete lining. No foreign matter left behind

FIG. 2 is an overall front view of a tunnel center provided with a temperature measuring device. FIG. 1 is a half-sectional side view of the temperature measuring device according to the first embodiment of the present invention. FIG. 3 is an enlarged sectional view of section A in FIG. 2; FIG. 6 is a partially cross-sectional side view and a plan view of the holding plate. It is a diagram showing temperature measuring device wiring. FIG. 7 is a partial side view in half cross section of a temperature measuring device according to a second embodiment of the present invention. It is a half cross-sectional side view of the temperature measuring device in 3rd Embodiment of this invention.

Note that the embodiments described below are merely examples, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included within the scope of the present invention.

(First embodiment)
FIG. 1 shows an overall front view of a tunnel center in which the temperature measuring device of the present invention is installed. The tunnel center 1 includes a gantry 11 that is movable in the longitudinal direction of the tunnel, and a substantially arc-shaped frame 12 that follows the cross-sectional shape of the tunnel is supported on the gantry 11. A lining concrete placement space (hereinafter simply referred to as placement space) S is formed between the outer periphery of the frame 12 and the inner periphery of the tunnel (not shown). In this embodiment, temperature measuring devices 2 are provided at three locations in the cross-sectional circumferential direction of the top form 121 located at the top of the frame 12 so as to protrude into the pouring space S. Note that the temperature measuring device 2 may be installed at a plurality of positions in the longitudinal direction of the tunnel on the top form 121 and the side forms 122 connected to both sides thereof.

FIG. 2 shows a half-sectional side view of the temperature measuring device 2. As shown in FIG. In FIG. 2, the frame 12 is provided with an opening 123, and a guide cylinder 21 communicating with the opening 123 projects inward of the frame 12. As shown in FIG. The pin body 22 is inserted into the guide tube 21 from inside the frame 12 and protrudes into the driving space S from the outer periphery of the frame 12. The pin body 22 has the same structure as that conventionally known as a test pin, and is a cylindrical cylinder with a closed end, in which the tip half protruding from the frame body 12 tapers toward the tip and has a smaller diameter. It is the body.

With the pin body 22 inserted into the guide tube 21 and protruding from the frame 12 to a predetermined height, the positioning hole 212 provided at the lower end of the guide tube 21 and the opposing circumferential wall of the pin body 22 The pin body 22 can be fixed to the guide tube 21 at a predetermined height by passing the fixing pin 24 through the through hole 221 provided in the guide tube 21 . Alternatively, instead of using the locking pin 24, the pin body 22 can be moved to any desired protruding position by pressing the locking screw 23 with the operating ring provided at the opposite position of the guide tube 21 forward to the outer periphery of the pin body 22 as shown in the figure. It is also possible to fix it with

FIG. 3 shows details of the end plate 222 portion that closes the cylindrical opening at the tip of the pin body 22. In FIG. 3, a thin circular end plate 222 is welded and fixed to the tip opening of the pin body 22 to close it, and a thick circular spacer plate 25 is placed over this. A thin retaining plate 26 is further attached to the spacer plate 25 by screwing a countersunk screw 252 into a screw hole 223 of an end plate 222 aligned with the through hole 251. A cross-sectional view and a plan view of the holding plate 26 are shown in FIGS. 4(1) and 4(2), respectively. Openings 261 into which the countersunk screws 252 are inserted are formed in the holding plate 26 at left and right positions, and the temperature measuring part 31 at the tip of the thermocouple 3 as a temperature measuring element is welded to the center of the back surface of the holding plate 26 between these openings 261. Fixed. Note that the spacer plate 25 is desirably made of a resin material that is not affected by the heat of the pin body 22 and has low thermal conductivity. Further, the spacer plate 25 may be omitted and the holding plate 26 may be directly fixed to the circular end plate 222.

In FIG. 3, a through hole 253 is formed in the center of the spacer plate 25 and the end plate 222 to communicate with each other, and the lead wire 32 of the thermocouple 3 extending from the holding plate 26 is passed through the through hole 253. It is inserted into the lower part of the cylinder of the pin body 22 and connected to an integrated temperature management control panel (hereinafter simply referred to as a control panel) 4 via a connector 41 (FIG. 5).

In a temperature measurement device having such a structure, when lining concrete is poured into the pouring space S, the pouring space S is filled with concrete, and the thermocouple 3 provided at the tip of the pin body 22 measures the amount of concrete being poured. The temperature of the concrete lining is detected over time, and the control panel 4 manages the cumulative temperature during the concrete curing process. When the curing of the lining concrete is completed, loosen the set screw 23 and pull out the set pin 24, and then horizontally insert the operating rod into the operating hole 224 (Fig. 2) provided at the base end of the pin body 21 in the part facing the cylinder wall. By inserting it into the guide tube 21 and rotating it to rotate the pin body 22 around its central axis, the pin body 22 is separated from the surrounding concrete and extracted from the guide cylinder 21 and downward into the frame body 12. In this state, the thickness of the concrete can be measured by inserting a scale through the guide tube 21 into the recess formed in the concrete after the pin body 22 is extracted.

According to the temperature measuring device of this embodiment, since the mounting opening 123 and the guide tube 21 can be used for measuring pins conventionally provided for measuring the concrete roll thickness, the temperature measuring device can be attached to the formwork 12. There is no need to provide a new dedicated mounting opening. Furthermore, it can be removed immediately after temperature measurement is completed, and no foreign matter will be left behind in the concrete. Since the thermocouple 3 is not cut, the extracted pin body 22 and the thermocouple 3 provided thereon can be used again. In addition, when replacing the thermocouple 3 with a new one, the holding plate 26 on which the used thermocouple 3 is attached is replaced with a new holding plate 26 prepared in advance with the new thermocouple 3 attached. This can be easily done by replacing it.

(Second embodiment)
In the first embodiment, the thermocouple 3 is provided at the tip of the pin body 22, but instead, it may be provided on the side surface of the pin body 22, as shown in FIG. In this embodiment, a mounting hole 225 is provided on the side surface of the pin body 22 at an intermediate position in the longitudinal direction that protrudes from the frame body 12 into the casting space S, and a cylindrical rubber or resin plug member 33 is press-fitted therein. . The temperature measuring portion 31 at the tip of the thermocouple 3 is welded and fixed to the metal cylinder 34 and press-fitted into the plug member 33 in advance.
According to such a structure, the temperature of the lining concrete poured into the pouring space S can be controlled at an intermediate position in the thickness of the lining concrete.

(Third embodiment)
The pin body 5 of the temperature measuring device 2 shown in FIG. It is composed of an inner cylinder 52 which is inserted into the casting space S and protrudes into the casting space S. The outer cylinder 51 is positioned and fixed to the guide cylinder 21 by a set screw 53, and the inner cylinder 52 is positioned and fixed to the outer cylinder 51 by a set screw 54. At the tip of the inner cylinder 51, a holding plate 26 is attached to which the tip temperature measuring part 31 of the thermocouple 3 is welded and fixed, with a structure similar to that described in the first embodiment. extends downward within the inner cylinder 52 and is connected to the control panel 4 via the connector 41 as in the first embodiment.

According to such a structure, the tip of the outer tube 51 and the tip of the inner tube 52 are aligned and the injection is carried out into the casting space S at this position and also at a position where the inner tube 52 protrudes from the outer tube 51. The temperature of the concrete lining can be measured. When curing of the lining concrete is completed, loosen the setscrew 54, rotate the operating rod inserted into the operating hole 521 at the lower end of the inner cylinder 52, and move the inner cylinder 52 from inside the outer cylinder 51 to the inside of the frame 12 downward. Pull it out.

Thereafter, the set screw 53 is loosened, and the operating rod inserted into the operating hole 511 at the lower end of the outer cylinder 51 is rotated to extract the outer cylinder 51 from the guide cylinder 21 and downward into the frame 12. Then, by inserting the scale into the recess in the concrete created after the pin body 5 is extracted through the guide tube 21, the thickness of the concrete can be measured. This embodiment also provides the same effects as the first embodiment.

Note that the mounting structure and mounting position of the thermocouple are not limited to those shown in the above embodiments.

DESCRIPTION OF SYMBOLS 1... Tunnel center, 12... Frame body, 2... Temperature measuring device, 22... Pin body, 26... Holding plate, 3... Thermocouple (temperature measuring element), 31... Tip temperature measuring part, 32... Lead wire, 5... Pin body, 51...outer cylinder, 52...inner cylinder, S...concrete placement space.

Claims (1)

A pin body that is protruded from the frame side into the concrete casting space formed between the frame body and the tunnel inner wall and used to measure the thickness of the cast lining concrete; and the pin body. the pin body is a cylindrical body with a closed end, and a mounting hole is provided in the side surface of the cylindrical body; A temperature measuring device for concrete lining, in which a plug member having the temperature measuring element installed therein is press-fitted into a mounting hole.