JP2022109342A - Compaction device for tunnel concrete - Google Patents

Abstract

To provide a compaction device for tunnel concrete capable of always compacting concrete reliably by avoiding malfunction of a concrete detection sensor.SOLUTION: A plurality of concrete detection sensors 4A to 4C are provided on a peripheral surface of a formwork 12 that forms an injection space S for the lining concrete CL along an inner circumference of a tunnel T at predetermined intervals from a lower position to an upper position of the peripheral surface. Vibrators 3A to 3D are vertically installed in the injection space S from above the peripheral surface. The vibrators 3A to 3D are raised according to the height positions of the concrete detection sensors 4A to 4C that detect the arrival of the liquid surface of the lining concrete CL injected into the injection space S.SELECTED DRAWING: Figure 2

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compaction apparatus for tunnel concrete, and more particularly to a compaction apparatus for tunnel concrete having a vibrator vertically installed.

A semicircular pouring space is formed between the outer periphery of the tunnel center formwork and the inner periphery of the tunnel. A compaction device with a structure in which a vibrator is suspended so as to be able to move up and down from a working port provided in the filling space is used. For example, in Patent Document 1, a concrete detection sensor is provided in the upper end of a suspended vibrator body, and the vibrator is activated every time the liquid level of the poured concrete rises and the vibrator body is immersed in the concrete and the concrete detection sensor is activated. It has been proposed that the main body is automatically lifted up by a predetermined amount so that the compaction work can always be reliably performed without visual inspection by the operator.

JP 2001-227165

However, in the above conventional compaction apparatus, since the single sensor for detecting concrete repeats immersion and escape from the concrete, there is a problem that the sensor often malfunctions due to adhesion of concrete to the sensor during this period. rice field.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a tunnel concrete compaction apparatus capable of always reliably compacting concrete by avoiding malfunction of a concrete detection sensor. and

In order to achieve the above object, in the first invention, the peripheral surface of the formwork (12) that forms the pouring space (S) for the lining concrete (CL) along the inner periphery of the tunnel (T). A plurality of concrete detection sensors (4A-4C) are provided at predetermined intervals from the lower position to the upper position of the surface, and a vibrator (3A-3D) is provided so as to be able to move up and down within the injection space (S) from the upper position of the peripheral surface. ) is vertically installed, and the vibrator (3A ~3D).

According to the first aspect of the present invention, the concrete sensors are immersed in the lining concrete sequentially from the lower position to detect the rise of the liquid level, and according to the height position of the concrete sensor that detected the arrival of the liquid level. Since the vibrator is raised to a predetermined position by pressing, the lining concrete whose liquid level gradually rises in the pouring space can be compacted well at all times. In the first invention, there is no conventional problem that a single concrete detection sensor malfunctions due to adherence of concrete while repeating immersion and escape from concrete as in the prior art, and ensures reliable compaction of concrete. It can be carried out.

In the second invention, a vibration sensor (5) is further provided for detecting vibrations transmitted to the lining concrete (CL) when the vibrators (3A-3D) operate, and the vibrators (3A-3D) are excessively vibrated. Try to suppress the continuation of vibration.

According to the second aspect of the present invention, it is possible to avoid problems such as sedimentation of aggregates in the lining concrete caused by excessive vibration of the lining concrete by the vibrator.

The symbols in parentheses above refer to the corresponding relationship with specific means described in the embodiments described later.

As described above, according to the compaction apparatus for tunnel concrete of the present invention, it is possible to avoid the malfunction of the concrete detection sensor and always perform reliable compaction of concrete.

1 is a half cross-sectional view of a tunnel center with a compaction device according to the invention; FIG. 1 is a side view of a tunnel center equipped with a compaction device of the invention; FIG. FIG. 10 is a cross-sectional view of the vibrator suspension in the injection space; FIG. 10 is a side view of the vibrator suspension in the injection space;

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

FIG. 1 shows a half cross section of a tunnel center 1 with a compaction device according to the invention. The tunnel center 1 has a gate-shaped gantry 11 on which a semicircular formwork 12 along the inner circumference of the tunnel T is supported. A semicircular pouring space S for pouring concrete is formed between the formwork 12 and the tunnel T. As shown in FIG.

An electric reel 2 with an encoder is provided on a stay 111 projecting sideways from the upper end of the leg portion of the gantry 11. After the cable 21 wound around the electric reel 2 is drawn upward, the mold is mounted. It hangs down along the side form 122 of the formwork 12 through the guide roller 22 provided in the closable opening 13 (see FIG. 2) of the top form 121 of the frame 12, and the vibrator 3 of a known structure is suspended at the lower end thereof. is set.

The tip vibrating part 31 of the vibrator 3 is positioned outside the lower end form 123 of the formwork 12 and directly above the inverted concrete CB placed at the bottom of the tunnel. In this embodiment, as shown in FIG. 2, the vibrators 3A to 3D having such a hanging structure are provided at four locations in the longitudinal direction of the tunnel center 1 located in the tunnel extension direction.

Driving and stopping of the vibrating tip 31 of each vibrator 3A to 3D is controlled by power supply from a control panel (not shown) via a cable 21. FIG. The vibrators 3A to 3D suspended from the cable 21 are raised and lowered by controlling the forward and reverse rotation of the electric reel 2 (FIG. 1) by a control panel. , is detected by the control panel according to the output signal of the encoder attached to the electric reel 2 .

In FIG. 2, on the outer peripheral surface of the frame 12 of the tunnel center 1, there are side foams 122 at both ends and the center in the longitudinal direction. A plurality of concrete detection sensors 4A, 4B, 4C are installed respectively. Concrete sensors 4A, 4B, and 4C used in this embodiment detect changes in electrical conductivity between electrodes, but sensors that detect changes in water content and other various sensors can also be used.

A plurality of vibration sensors 5 are installed vertically in a row on the side foam 122 and the bottom foam 123 at the central portion of the outer peripheral surface of the frame 12 of the tunnel center 1 at intervals. Although the vibration sensor 5 used in this embodiment detects acceleration, it may also detect velocity, displacement, or the like. Signals from these concrete sensors 4A, 4B, 4C and vibration sensor 5 are also input to the control panel.

In the present embodiment, as shown in FIG. 2, the injection of concrete CL is carried out in a number of inspection openings 14 provided at upper and lower positions on the outer peripheries of the crown form 121 and the side forms 122 in the longitudinal direction of the tunnel center 1. , the front end of the casting pipe 15 protrudes into the casting space S from each of the inspection openings 14 located in the front half and the rear half in the longitudinal direction.

When using the tunnel concrete compaction device having the above configuration, the vibrators 3A to 3D are lowered to the lowest position in the pouring space S (hereinafter, the vibrator 3B will be described with reference to FIGS. 3 and 4). . At this time, the tip vibrating portion 31 of the vibrator 3B is intermittently vibrated. In this state, concrete is injected into the CL injection space S from the placing pipe 15 . When the liquid level of the injected concrete CL rises and the tip vibrating part 31 of the vibrator 3B is immersed in the concrete CL, compaction (air removal) of the concrete CL is performed by vibration.

When the liquid level of the concrete CL rises further and this is detected by the concrete detection sensor 4B1 provided at the lowest position, the cable 21 is hoisted by the electric reel 2 and the vibrator 3B starts to rise. The vibrating operation of the vibrator 3B is switched from intermittent to continuous in order to ensure the removal from the concrete CL.

When it is detected by the output signal of the encoder attached to the electric reel 2 that the vibrator 3B has risen to a predetermined intermediate height position between the concrete detecting sensor 4B1 at the lowest position and the concrete detecting sensor 4B2 directly above it, the vibrator is activated. The rise of 3B is stopped and its oscillatory operation is again switched from continuous to intermittent.

Until the injection of the concrete CL further progresses and the liquid level reaches the concrete detection sensor 4B2, the concrete CL is compacted by the intermittent vibration of the vibrator 3B. When the liquid level of the injected concrete CL reaches the concrete sensing sensor 4B2, the vibrating operation of the vibrator 3B is continuously switched, and the vibrator 3B is positioned between the concrete sensing sensor 4B2 and the concrete sensing sensor (not shown) directly above it. is raised to a predetermined intermediate height position, and such steps are repeated to compact the concrete CL in which the amount increases and the liquid level rises. In this process, the lower inspection opening 14 where the liquid level of the concrete CL reaches is closed, and the placing pipe 15 is moved to the upper inspection opening 14 .

When the vibrator 3B is raised to the highest position, pouring and compaction of the concrete CL into both sides of the pouring space S formed around the outer periphery of the formwork 12 of the tunnel center 1, excluding the ceiling, are completed. In this embodiment, vibrators 3A and 3D at both ends in the longitudinal direction are controlled by signals from concrete sensors 4A and 4C in rows at both ends in the longitudinal direction of tunnel center 1 shown in FIG. Vibrators 3B and 3C on both sides of the central portion in the longitudinal direction are controlled by signals from a row of concrete detecting sensors 4B.

Instead of this, rows of concrete detection sensors may be provided corresponding to the respective vibrators 3A to 3D, or if the liquid level of the poured concrete CL can be kept substantially constant in the longitudinal direction of the tunnel center 1. All the vibrators 3A to 3D may be controlled by a row of concrete sensing sensors.

The ceiling of the pouring space S, in this embodiment, is poured and compacted with another structure. Of course, it is also possible to pour and compact concrete up to the ceiling with the structure described above.

Further, in the present embodiment, by providing a row of vibration sensors 5 as described above, it is possible to determine how the vibrators 3A to 3D vibrate the concrete CL whose liquid level has reached the vertically arranged vibration sensors 5. You can find out how well it works. Excessive vibration causes sedimentation of aggregates in the concrete CL, so if there is a risk of excessive vibration by calculating the cumulative frequency on the control panel, at least one of the vibrators 3A to 3D vibrates. It performs control such as appropriately stopping the operation. A plurality of rows of vibration sensors may be provided, or, conversely, only one sensor may be provided at the lowest position. Moreover, it is not essential to provide a vibration sensor, and the operating time of the vibrator may be managed by a timer.

According to the tunnel concrete compaction apparatus shown in the above embodiment, a plurality of concrete detection sensors are provided on the outer peripheral surface of the frame of the tunnel center at intervals in the vertical direction, and the liquid level of the concrete injected into the injection space is measured. By raising the vibrator to a predetermined position according to the height position of the concrete detection sensor that detects the arrival of , the concrete that is injected and whose liquid level gradually rises can be compacted well at all times. At this time, since the concrete detection sensor is immersed in the concrete sequentially from the lower position and detects the rise in the liquid level, while a single concrete detection sensor repeats immersion and escape from the concrete as in the past, Accurate compaction of concrete can be achieved without the problem of malfunction due to adherence of concrete. In general, when moving to a new placement position after finishing pouring concrete, the entire formwork is washed. A clean concrete sensing sensor will be used when pouring concrete.

DESCRIPTION OF SYMBOLS 1... Tunnel center, 12... Formwork, 3A, 3B, 3C... Vibrator, 4A, 4B, 4C... Concrete detection sensor, 5... Vibration sensor, CL... Lining concrete, T... Tunnel.

Claims (2)

A plurality of concrete detection sensors are provided on the peripheral surface of the formwork that forms the pouring space for the lining concrete along the inner periphery of the tunnel at predetermined intervals from the lower position to the upper position of the peripheral surface. A vibrator is vertically installed in the pouring space from a position above the surface so as to be able to move up and down. Tunnel concrete compaction device designed to be raised to a predetermined position. 2. The tunnel concrete compacting apparatus according to claim 1, further comprising a vibration sensor for detecting vibration transmitted to the lining concrete when the vibrator is operated, thereby suppressing excessive continuation of vibration of the vibrator.

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