JPH0633001U - Construction ruler for steel arch support - Google Patents

Abstract

(57) [Summary] [Purpose] To easily and accurately set the installation position and angle of steel arch supports. [Structure] From the tip of the horizontal reference piece 1a that defines the horizontal of the installation surface 3 at the lower end of the steel arch support 2, the inner surface of the lower end of the steel arch support 2 is abutted upward and the erection angle A reference point mark 4 for irradiating the laser reference light at a position vertically above the horizontal reference piece 1a and a predetermined distance horizontally from the inner reference piece 1b. It is characterized by being a metal plate body provided with.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ruler for accurately installing a steel arch support at a predetermined position and a predetermined angle.

[0002]

[Prior art]

 Generally, the installation accuracy of the installation position of the leg of the steel arch support in the upper half of the tunnel is the most important in terms of ensuring the proper tunnel winding thickness. The accuracy is poor because the survey is performed below.As a countermeasure, the laser reference light is transmitted along the tunnel direction, the installation position is measured with tape from the irradiation point of this reference light, and the position is painted. The method of marking is adopted.

[0003]

[Problems to be solved by the device]

 However, in the conventional method, measurement is performed horizontally from vertically below the irradiation point of the reference light, so it is necessary to determine the measurement reference point below the irradiation point, and it is not easy to perform measurement work and accuracy, and especially for the construction of shoring works. Even if the installation position could be measured, the accuracy of the installation angle could not be known.

[0004]

[Means for Solving the Problems]

 This invention is constructed such that the inner surface of the lower end of the steel arch support 2 is abutted upward from the tip of the horizontal reference piece 1a that defines the horizontal of the installation surface 3 at the lower end of the steel arch support 2. A reference for irradiating the laser reference light at a position provided with an inner reference piece 1b for defining the included angle, a predetermined distance above the horizontal reference piece 1a, and a predetermined horizontal distance from the inner reference piece 1b. This is a proposal for a construction ruler for a steel arch supporting work made of a metal plate body provided with point marks 4.

[0005]

[Action]

 The horizontal reference piece 1a is installed on the floor while the reference point mark 4 of the construction ruler 1 is irradiated with the laser reference light. In this state, the steel arch support 2 is installed and the inner surface of the lower end is the inner surface. The building position and angle are set by being attached to the reference piece 1b.

[0006]

【Example】

 The construction ruler 1 for the steel arch support is made of a metal plate in the shape of a substantially rectangular frame, and a horizontal reference piece 1a is provided on the bottom surface of the steel arch support 2 for defining the level of the installation surface 3 at the lower end of the steel arch support. Further, an inner surface reference piece 1b is provided upward from the tip of the horizontal reference piece 1a so as to abut the inner surface of the lower end portion of the steel arch support 2 and to define the building angle thereof.

At the upper rear end of the building ruler 1, a predetermined distance is placed vertically above the horizontal reference piece 1a, and a laser reference light is radiated at a position that is placed a predetermined distance horizontally from the inner reference piece 1b. A reference point mark 4 is provided.

[0008]

[Effect of device]

 As described above, according to the present invention, by installing the horizontal reference piece on the floor with the reference point mark of the building ruler irradiated with the laser reference light, the steel is held at the position of the tip of the horizontal reference piece. The built-in position of the steel arch support can be displayed, and the installation angle can be automatically set by attaching the steel arch support to the inner reference piece.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a built-in position of a support work is set according to the present invention.

[Explanation of symbols]

 1 Built-in ruler 1a Horizontal reference piece 1b Inner reference piece 2 Steel arch support 3 Installation surface 4 Reference point mark

Claims (1)

[Scope of utility model registration request] 1. From the tip of a horizontal reference piece that defines the horizontalness of the installation surface of the lower end of the steel arch support, upwardly,
An inner reference piece is provided that abuts the inner surface of the lower end of the steel arch support to define the building angle of the steel arch support, a predetermined distance above the horizontal reference piece, and a predetermined horizontal distance from the inner reference piece. A ruler for steel arch support construction, comprising a metal plate body provided with a reference point mark for irradiating a laser reference light at the position where the is placed.