JP3387608B2 - Method of forming inverted concrete and height measuring 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 method for forming invert concrete and a height measuring device, and more particularly to a method for forming invert concrete of a height as designed in an excavated tunnel and the height of the invert concrete. The present invention relates to a device for measuring whether or not it is as designed.

[0002]

2. Description of the Related Art Conventionally, when constructing a tunnel, invert concrete is sometimes finished on a tunnel bottom plate after the tunnel is excavated and prior to installation of an arch lining. Such a tunnel construction method is called an invert concrete precedent tunnel construction method.

That is, in the invert concrete precedent type tunnel construction method, a main rail for loading and unloading tunnel excavating machines and various machinery is usually laid on the roadbed. It is formed by carrying out once, then removing the shear on the roadbed to expose the reference surface of the roadbed, that is, the bottom plate, and then placing invert concrete on the bottom plate.

By the way, it is well known that in such an invert concrete leading type tunnel construction method, the invert concrete (hereinafter, simply referred to as "invert") must be formed at a designed height.
Conventionally, the height of such invert concrete has been measured by some measuring methods such as register mark surveying or surveying by a water system before the concrete is completely hardened. As a result of the measurement, concrete was replenished at a portion lower than the design height, and concrete was removed at a portion higher than the design height.

[0005]

However, the conventional method for measuring the height of such invert concrete is as follows.
Each of them had a problem that the accuracy was about ± 15 mm, the measurement was very troublesome, and the work efficiency was not good. In other words, in other words, it took a great deal of time and labor to form the invert concrete itself, and therefore, it has been desired to provide a method for efficiently forming the invert concrete with high accuracy.

An object of the present invention is to solve such a conventional problem, and a method for efficiently forming an invert concrete having a height dimension which is highly accurate with respect to a design dimension in a tunnel construction and its height. An object of the present invention is to provide a device for easily and efficiently measuring whether or not the design is as designed.

[0007]

The present invention is a method for forming invert concrete, which has the following constitution in order to solve the above-mentioned technical problems. That is, the invert concrete forming method of the present invention is roughly divided into an invert concrete height measuring device installation step, an invert concrete placing step, an invert concrete height measuring step, and an invert concrete height readjusting step. . Each of these steps will be described in more detail below.

(Installation Step of Invert Concrete Height Measuring Device) Usually, overhang receiving shelves are attached to both side walls of the tunnel by using supporting works prior to formation of the tunnel invert concrete. This overhang receiving rack is used to install rails for sliding scaffolds that finish the surface of the placed invert. Therefore, the height measuring device is movably installed using the rails installed on the overhang receiving rack. That is, the height measuring device is placed between rails installed on the left and right sides of each overhang receiving shelf before or after the invert concrete is placed and is bridged above the bottom plate to be movable in the length direction of the tunnel. Is installed in.

(Invert concrete placing step) Invert concrete is placed on the tunnel bottom plate before and after the installation of the height measuring device. The casting of this invert concrete is compacted using conventional methods, such as vibrator machines. At that time, the invert concrete is placed while temporarily adjusting the height of the inverted concrete by an operator. Then, the surface is finally smoothed by an operator on the above-mentioned slide scaffold from above using a tool such as a trowel.

(Invert concrete height measuring process)
When the invert concrete is cast on the bottom plate of the tunnel, the height measuring device is moved on the rails for the length of the invert concrete construction before it is completely hardened. This height measuring device is equipped with a measuring unit that is slidable in the width direction, that is, the width direction of the tunnel, and an operator can move the measuring unit while moving the height measuring device in the longitudinal direction of the tunnel. Measure the distance from the surface of the inverted concrete while sliding in the direction.

(Invert concrete height re-adjustment step) Based on the measurement result of the invert concrete height, concrete is further replenished on the surface of the invert concrete which has not reached a predetermined height, and the surface height is too high. For that, remove that part,
The height is readjusted.

Further, the present invention is a height measuring device directly used for carrying out the above-mentioned invert concrete forming method, and has the following constitution in order to solve the above-mentioned technical problem. That is, the invert concrete height measuring device of the present invention is roughly divided into a trolley body, a scale support bar, and a measuring section. Each of these configurations will be specifically described.

(Bogie main body) Supporting works are installed on both side walls of the tunnel. Overhanging receiving shelves are formed by using the supporting works, and rails are installed on the supporting racks extending in the longitudinal direction of the tunnel. Has been done. This rail is mainly used for supporting and moving a slide scaffold that finishes its surface during invert concrete formation. The left and right ends of the trolley body are placed between rails, one on the left and one on the overhang receiving shelf, bridged above the roadbed, and movably installed in the length direction of the tunnel.

(Scale Support Bar) A scale support bar is attached to the trolley body. The scale support bar is horizontally attached to the front side or the rear side in the moving direction of the carriage body over substantially the entire width.

(Measuring Section) Further, a measuring section is slidably attached to the scale support bar, and this measuring section measures the distance from the invert surface formed on the bottom plate of the tunnel. Specifically, the measuring unit can use a measuring pin extending vertically to the invert surface, but can also use a range finder using light such as infrared rays, sound waves, or radio waves.

[0016]

According to the method for forming invert concrete of the present invention, first, the rails for the slide scaffold for finishing the surface of the invert concrete are installed on the overhanging shelves provided by using the support work on both side walls of the tunnel. It

Next, the invert concrete height measuring device is placed so that the left and right ends thereof are placed between the rails on each of the overhang receiving shelves, is bridged above the roadbed, and is installed so as to be movable in the length direction of the tunnel. Before and after installing the height measuring device on the rail, invert concrete is placed on the bottom plate of the tunnel according to a conventional method. After that, before the invert was completely cured, the height measuring device was moved along the rail, and at the same time, the worker who got on the trolley body slid the measuring part along the width direction of the tunnel and placed it. Measure the height of invert concrete.

Further, according to the height measuring device for invert concrete of the present invention, the rails are laid on the overhang receiving shelves formed on both side wall portions of the tunnel so as to extend in the longitudinal direction of the tunnel. Both ends of the bogie body are placed on the rails, and the carriage body is movably arranged above the tunnel bottom plate. When the invert concrete is placed on the bottom plate of the tunnel, the trolley body is moved before it is hardened.

The carriage main body is stopped during movement or at any time, and the measuring portion slidably supported by a scale support bar horizontally attached to the carriage main body is slid. This measuring unit measures the distance to the surface of the invert concrete. An operator on the trolley body observes this and measures the height of the concrete.

[0020]

EXAMPLES The method for forming invert concrete and the height measuring apparatus of the present invention will be described below in more detail with reference to the examples shown in the drawings. FIG. 1 shows an invert height measuring device 10 according to an embodiment of the present invention. This FIG. 1 is also one step of the method for forming invert concrete according to one embodiment of the present invention.

First, the invert concrete height measuring apparatus 10 used directly for carrying out the method for forming invert concrete of the present invention will be described. The invert concrete height measuring apparatus 10 includes a trolley body 14 movably installed by rails 13 laid on overhang receiving shelves 12 formed on both side walls of the tunnel 11.

As shown in FIG. 1, the overhang receiving rack 12 has the tunnel bottom plate 11a and the invert concrete 1
It is mainly used for moving a slide scaffold (not shown) for finishing the surface flat when forming 5, but using this rail, the height measuring device 1 of this embodiment 1
Also used to move 0. For this reason, the rails 13 installed on the overhang receiving shelves 12 formed on the both side walls of the tunnel can be said to be multipurpose rails. Therefore, the multipurpose rails 13 having an extremely high strength of about 30 kg / m are required. It is used.

The overhanging shelves 12 formed on both side walls of the tunnel are made of steel material 12a having a U-shaped cross section, which is fixed to the supporting members 16 on both side walls at appropriate intervals in the longitudinal direction of the tunnel by welding or the like. The multi-purpose rail 13 is installed on the steel materials 12a arranged at intervals.

The trolley body 14 has left and right end portions 14a,
14b are placed between the rails 13 installed on the overhang receiving shelves 12a one by one on the left and right, bridged above the tunnel bottom plate 11a, and installed so as to be movable in the length direction of the tunnel. As shown in FIG. 2, the trolley body 14 is composed of an aluminum rectangular pipe, and the portion between the both end portions 14a and 14b is the bottom plate 11 of the tunnel as a whole.
The shape is lowered to the a side.

For convenience of explanation, the portion which is lowered toward the bottom plate 11a is referred to as a scale installation portion 14c. The degree of lowering of the scale installation portion 14c with respect to both end portions 14a and 14b depends on the invert 1 of the designed height formed on the bottom plate 11a.
5 is set to be close to the surface. This means that the rail 13 and the overhang receiving rack 12
Also means that it is formed at a position designed in advance based on the height from the tunnel bottom plate 11a.

The scale installation portion 14c of the trolley body 14
A scale support bar 17 is disposed below the front edge of the scale support bar 17, and both ends and an intermediate portion of the scale support bar 17 are accurately held in a horizontal state by bearings 18 fixed to the scale installation portion 14c. Supported and fixed. The scale support bar 17 is composed of a hollow pipe as is clear from FIGS.
It is made lightweight together with c.

The scale support bar 17 has a measuring portion 1 between the bearing portions 18 at both ends and the intermediate bearing portion 18.
9 is slidably provided. These measuring units 19
As shown in FIG. 3, it comprises a ring member 19a that fits tightly and slidably on the scale support bar 17, and a measuring pin 19b attached to one point on the peripheral surface thereof. The measuring pin 19b extends vertically downward, and the lower end, which is the other end, is formed in such a length that it comes into contact with the surface of the invert 15 that is cast on the tunnel bottom plate 11a at the designed height.

Next, the operation of the invert concrete height measuring apparatus 10 of the above-described embodiment and the method for forming invert concrete of the present invention will be described below. First, the invert concrete height measuring device 10 is mounted on a multipurpose rail 13 installed on an overhang receiving rack 12 provided by using supporters 16 on both side wall portions of the tunnel, and the left and right ends of the bogie main body 14 thereof. The parts 14a, 14b are placed on the bridge and bridged above the bottom plate of the tunnel so that the parts can be moved in the length direction of the tunnel.

Before and after the installation of the height measuring device 10 on the rail 13, the invert concrete 15 is cast on the tunnel bottom plate 11a while being compacted by a conventional method, that is, a vibrator machine. At that time, the invert concrete 15 is placed while temporarily adjusting the height of the inverted concrete 15 by the operator's eyes. Then, the surface is finally smoothed by an operator on the above-mentioned slide scaffold from above using a tool such as a trowel. The water blocking plates 20 are simultaneously provided on both sides of the invert concrete 15 during pouring.

Thereafter, the height measuring device 10 is moved along the rail 13 before the invert 15 is completely cured. Then, while the carriage main body 14 constituting the height measuring device 10 is moving or is stopped at any time, an operator who rides on the scale installation portion 14c of the carriage main body 14 is attached to the scale support bar 17 by the two workers. The measuring units 19 are slid along the bars 17, respectively.

Measuring pin 19b constituting this measuring unit 19
As described above, since the tip portion of the concrete is formed to have a length that indicates the height of the planned invert 15, the groove with the measuring pin is dug on the surface where the height of the concrete surface is high, and the height is low. By the way, there is a space between the invert surface and the tip of the measuring pin 19b. A worker who rides on the trolley body 14 observes this and measures the height of the concrete.

In the method for forming invert concrete and the height measuring apparatus of this embodiment, the truck main body 14 constituting the height measuring apparatus 10 is supported by the rails 13 and the tunnel 11 is formed.
Of the invert construction direction, and at the same time, the measuring unit 19 slides in the direction perpendicular to the moving direction of the carriage main body 14, that is, in the width direction of the tunnel. In other words, the entire area can be measured evenly. However, in reality, it is not necessary to measure it very finely.

In this way, the height of the invert 15 is measured at required points over the construction length thereof, and as a result, the concrete is removed by a portion where the height of the invert 15 is not as designed, that is, a portion which is too high. If it is too low, the concrete is adjusted by adding concrete to form the invert 15 having very high height accuracy. As described above, the height of the invert 15 can be measured very easily and quickly, and the accuracy thereof is further improved as compared with the conventional measuring method.

In the above-described embodiment of the present invention, the measuring unit 19
Was composed of a ring member 19a and a measuring pin 19b slidably fitted to the scale support bar 17 made of a hollow pipe, but the present invention is not limited to this example, and various sliding movements are possible. The method can be used, and thus the measuring part can also be formed in various shapes based on this sliding method.

The measuring section 19 actually measures the distance between the scale support bar 17 to which the measuring section 19 is attached and the surface of the invert 15. Therefore, instead of such a measuring pin, for example, Light like infrared,
A range finder using sound waves or radio waves may be used.

[0036]

As described above, according to the method for forming invert concrete of the present invention, the height measuring device bridged between the rails provided on both side walls of the tunnel is moved in the length direction of the tunnel and Since the height of the invert surface is measured by sliding the measuring portion of the scale support bar attached to, the tunnel invert with high surface height accuracy can be easily and quickly formed.

Further, according to the invert height measuring device of the present invention, the invert height can be measured only by moving the invert height over the construction length and sliding the measuring portion to the left and right. The operation is very simple and the entire invert can be measured accurately.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an invert concrete height measuring apparatus according to an embodiment of the present invention and schematically showing a state of one step of the invert concrete forming method of the present invention.

FIG. 2 is a cross-sectional view showing the invert concrete height measuring apparatus of the embodiment shown in FIG. 1 taken along line 2-2.

FIG. 3 is a perspective view showing a mounting state and a measuring unit of a scale support bar at an end of a scale installing unit of a bogie main body in the invert concrete height measuring apparatus shown in FIG.

[Explanation of symbols]

10 Invert concrete height measuring device 11 tunnels 12 Overhang receiving rack 13 rails 14 trolley body 14a End of trolley body 14b End of trolley body 14c Scale installation part of trolley body 15 Invert concrete 16 Support work 17 Scale support bar 18 Bearing 19 Measurement section 19a ring part 19b Measuring pin 20 Water stop plate

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Claims (2)

(57) [Claims] 1. An invert concrete height measuring device is bridged above a bottom plate by moving left and right ends between rails installed on overhang receiving shelves formed on both side walls of the tunnel and moved in the length direction of the tunnel. It is possible to install, and before and after this, invert concrete is placed on the bottom plate of the tunnel, and after the invert concrete is placed, the height measuring device is configured while moving the height measuring device over the construction length. The height of the invert concrete surface is measured by sliding the measuring part that can slide in the width direction of the tunnel, and the height of the invert concrete is readjusted based on the measurement result. Forming method. 2. A movably arranged bridge over the bottom plate of the tunnel with both ends placed on rails extending in the longitudinal direction of the tunnel on overhanging shelves formed on both side walls of the tunnel. Of the trolley body, a scale support bar horizontally attached to the trolley body over substantially the entire width thereof, and an invert concrete surface slidably attached to the scale support bar and cast on the bottom plate of the tunnel. An invert concrete height measuring device consisting of a measuring unit for measuring distance.