JP2000329551A - Method for investigating changing state by measuring radius of curvature of lined tunnel surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make graspable the degree of changing slate from the initial shape by calculating a shape such as an initial radius of curvature or the like of a lined concrete, and comparing the shape such as the radius of curvature or the like by each section measurement result with the initial shape. SOLUTION: The surface of a lined concrete when constructed has a constant radius of curvature. The surface of a lined concrete of an existing tunnel is measured and abnormal values are detected from many section measurement results with the use of a statistic method, whereby a degree of deformation is clearly grasped as indicated by a table and a graph, and correction points are determined. A tunnel-measuring machine which can measure a sectional shape of the liquid concrete of many points from one measurement point is used, so the sections at many points of the lined concrete are measured in a short time and many section measurement results are obtained. A shape such as an initial radius of curvature or the like is calculated from the results with the use of the statistic method. Each sectional shape (series 1-7) and an initial shape (series 8) are compared at the spot by a computer to determine correction points.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for examining the degree of deformation of a lining concrete after the construction of a tunnel constructed to have a constant radius of curvature.

[0002]

2. Description of the Related Art Conventionally, as a method of grasping whether or not a tunnel after building is deformed and the cross section inside the tunnel violates a building limit, a method of measuring a shape by measuring a cross section of the tunnel and a method of designing at the time of construction are known. A method of grasping the difference from the current shape by comparing with the cross section has been taken. However, it did not compare with the true shape of the tunnel when it was made, nor did it capture the deformation of the lining concrete from its initial shape. Also, many years have passed since the building was built, and if the materials at the time of building were lost, it was difficult to grasp the deformation itself. Further, the measurement method is also an investigation method in which a large number of measurement points are set, and while a measuring machine is set at each measurement point, the sectional shape of the tunnel at the measurement point is measured.

[0003]

The information obtained by the prior art does not capture the accurate deformation of the lining concrete from the initial shape as described above, and the information obtained when the building material is lost is lost. Was even more so. In addition, because of the large number of measurement points, the survey required a lot of time and money. As a result, the interval between surveys is prolonged, and in addition to the inability to accurately grasp abnormalities, early and appropriate repairs are not performed, and there are also safety issues, leading to an increase in tunnel maintenance and repair costs. It was something with.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to cover a tunnel constructed to have a constant radius of curvature after construction. It is an object of the present invention to provide a method for investigating a surface deformation of a tunnel in which the deformation of the concrete can be grasped by comparing it with the initial shape, and the time and cost for the investigation are greatly reduced.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, a method for investigating deformation by measuring the radius of curvature of a tunnel lining surface according to the present invention comprises the steps of: Using a tunnel cross-section measuring machine that can measure, measure the cross-section of a large number of places of lining concrete after construction from one measurement point, using a statistical method from the number of cross-section measurement results, By calculating the shape such as the initial radius of curvature, and comparing the shape such as the radius of curvature based on the respective cross-sectional measurement results and the initial shape, to see the degree of deformation from the initial shape of the lining concrete. It is characterized by becoming.

[0006]

Embodiments of the present invention will be described with reference to the drawings. <Embodiment 1> FIG. 1 is a conceptual diagram showing a measurement situation when a measuring machine is included in the cross section at 90 degrees with respect to a base line by a tunnel cross-sectional measuring machine according to Embodiment 1 of the present invention, and FIG. FIG. 3 is a conceptual diagram illustrating a measurement state of a tunnel cross section not including a measuring device by the tunnel cross section measuring device of the first embodiment, FIG. 3 is an explanatory diagram illustrating an actual tunnel cross section measurement example of the same first embodiment, and FIG. 5 is a table and a graph in which the measurement results of the first embodiment are averaged and standardized.

Conventionally, the measurement of the cross section of a tunnel has been carried out by applying a laser beam to a lining concrete wall of a tunnel which has been constructed so as to have a constant radius of curvature at a predetermined forward angle while appropriately setting an irradiation point angle on a circular rail. Irradiation is performed by calculating the cross-sectional shape of one location of the tunnel based on the reflection time of the laser beam from each irradiation point reflected from the lining concrete wall, the forward angle, and each of the irradiation point angles. I was The present invention employs a tunnel cross-section measuring machine that can measure the forward angle, changing for each irradiation point in a target cross-section, and calculating the cross-sectional shape of a plurality of tunnels from one measurement point. ing.
The principle of measurement by the tunnel cross-section measuring machine 2 will be described below.

1 and 2, the tunnel cross-section measuring machine 2 changes the forward angle T (tilt angle) to
The irradiation position of the irradiated laser beam can be set such that the laser beam can be applied to a predetermined portion (for example, at an interval of 1 meter) in front of the laser beam, and is rotated by a circular rail with the forward angle T fixed. Irradiating the laser beams 1 to the irradiation points A1 to An while taking M, the irradiation points A1 to An
Are calculated based on the forward angle, the irradiation point angle, and the reflection time. The value is processed by computer to calculate the radius of curvature of the measurement point back, and the value is statistically processed and recorded for each casting block, connected to each irradiation point, displayed on the computer screen, and visually judged. I can do it. FIG. 1 shows an example of a measurement situation when a measuring instrument is included in the section at 90 degrees with respect to the base line by the tunnel section measuring instrument, and FIG. The tunnel cross-section measuring machine 2 is set at a measurement position 4 provided in the tunnel 3. As shown in FIG. 3, a cross-section measurement site a consisting of a certain range above the tunnel 3
Is divided for each casting block, and three section measurement sites a are set in each of the casting blocks, and the numerical values at the section measurement sites a are measured. In this embodiment, three cross-section measurement sites are set. However, the present invention is not limited to the three sites, but may be set to two or more sites. The casting blocks are series 1 to series 7.

FIG. 4 shows a numerical value at each measurement site a in each cross section of each of the placing blocks divided into the series 1 to the series 7, and calculates the radius of curvature back calculated using a statistical method and the average value thereof. , The standard deviation value and the standardized value were obtained, and are shown in tables and graphs. Further, a series 8 consisting of the average value obtained by averaging the values for each block series is calculated,
It is displayed on the graph. It can be assumed that the series 8 indicates the radius of curvature at the initial stage of the tunnel, and a series that is significantly different from this value has a large deformation and can be determined to be a part requiring repair or the like.

[0010] Thus, the present invention provides that the lining concrete of a mountain tunnel is constructed of a fixed-size slide centure (a support used during the work of attaching an arch formwork).
By taking advantage of the fact that the surface of the lining concrete made with the standard centur is also made with the standard size, the radius of curvature is back calculated by multi-section measurement, and the change is observed to determine the degree of deformation. It is to judge. In other words, since the surface of the lining concrete at the time of construction has a constant radius of curvature, the surface of the lining concrete of the existing tunnel was measured, and the abnormal values were measured using a statistical method from the results of numerous cross-sectional measurements. As shown in the table and graph of FIG. 4, the degree of deformation is clearly grasped, and the part to be repaired is determined. Therefore, the present invention is effective even when many years have passed since the building and the materials and the like at the time of building have been lost.

As described above, the present invention uses a tunnel measuring machine capable of measuring the cross-sectional shape of a plurality of lining concrete from one measuring point, so that a large number of lining concrete can be measured in a short time. The cross section measurement is performed, a large number of cross section measurement results are obtained, and the shape such as the initial radius of curvature of the lining concrete is calculated from the large number of cross section measurement results using a statistical method. The degree of deformation of the lining concrete from the initial shape of the lining concrete is compared by instantly comparing the measured shape (series 1 to series 7) and the initial shape (series 8) on site with a handy computer. To quickly determine the repair location.

The tunnel cross-section measuring machine used in the present invention has a high accuracy of a distance accuracy of 3 mm and a cross section of 1 mm.
It has a high speed of about 2 minutes measured at 00 points, has the convenience of being driven by a 12-volt battery, and has a light weight of 7.5 kg that can be carried by one person (product name profiler manufactured by Amberberg Measuring Technique Co., Ltd.) 4000).

The present invention is as described above.
The following effects are obtained. By using a tunnel measurement machine that can measure the cross-sectional shape of lining concrete at many points from one measurement point, the results of the measurement of many cross-sections obtained are processed using a statistical method, and the By calculating the shape such as the initial radius of curvature and comparing the shape obtained by measuring each cross-section with the initial shape, even if the construction data was lost, which was impossible with the prior art, It is possible to grasp the degree of deformation of the tunnel in a short time. Furthermore, since the investigation can be performed in a short time, it is easy to shorten the investigation interval (increase the number of investigations within a certain period), and the cost is low. As a result, tunnel repair work can be performed more accurately and earlier, and repair time,
The repair cost can be greatly reduced, and safety can be improved through early and appropriate repairs, as well as labor saving in tunnel renovation work.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a measurement state of a tunnel cross section when the cross section includes a measuring instrument at 90 ° with respect to a base line by the tunnel cross section measuring apparatus according to the first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a measurement state of a tunnel cross section that does not include a measuring device by the tunnel cross section measuring device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an example of actual tunnel section measurement according to the first embodiment of the present invention.

FIG. 4 is a table and a graph in which the measurement results of the first embodiment of the present invention are averaged and standardized.

[Explanation of symbols]

 a ... A1 to An irradiation point T ... forward angle M ... irradiation point angle 1 ... laser beam 2 ... tunnel cross section measuring machine 3 ...・ ・ ・ Tunnel 4 ・ ・ ・ ・ ・ ・ ・ Measurement position 5 ・ ・ ・ ・ ・ ・ ・ Lined concrete surface measurement rail 6 ・ ・ ・ ・ ・ ・ Lined concrete surface measurement rail

Claims (1)

[Claims] 1. A tunnel cross-section measuring machine capable of measuring a plurality of tunnel cross-sectional shapes from one measurement point in a tunnel, and measuring a plurality of cross-sections of lining concrete after construction from one measurement point. Perform, using a statistical method from the large number of cross-sectional measurement results, calculate the shape such as the initial radius of curvature of the lining concrete, the shape such as the radius of curvature by the respective cross-sectional measurement results and the initial shape and Deformation inspection method by measuring the radius of curvature of tunnel lining surface, characterized by comparing the degree of deformation from the initial shape of lining concrete by comparing