JPH0842295A - Set method of form - Google Patents

Abstract

PURPOSE:To position a form by only an operator for operating a jack, at the same time, to carry out positioning work of the form in a short period of time and to shorten a construction period necessary for form setting work. CONSTITUTION:While arranging a plurality of laser beam generators L to a lined tunnel part, targets T1-T4 as the targets of the lasser beam generators L are arrange to an unlined tunnel section to be set a form K. Under irradiation of the targets T1-T4 with lasser beams generated from the lasser beam generators, the form K is positioned and is set on the basis of the targets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of setting a form using a laser beam, and more particularly, to setting a form for lining on an uncovered tunnel part following a tunnel part which has been covered. The present invention relates to a method for setting a formwork that is suitable when used as a technique.

[0002]

BACKGROUND OF THE INVENTION In the construction of a tunnel, it is generally necessary to cover the inner surface of the excavated tunnel with concrete or the like. This lining work is usually carried out by a means such as an excavator or a blast, after first digging for a predetermined length in the axial direction of the tunnel to be constructed, and then a formwork for lining the dug part Assembling, placing concrete between this formwork and the ground inside the tunnel, and removing the formwork after hardening of the concrete or after the specified strength is developed, the ground inside the excavated tunnel is made concrete. It is a lining. Then, the lining work and the excavation work are performed alternately or in parallel to sequentially construct the tunnel.

In recent years, in the lining work of such tunnels, in order to improve the accuracy of the formwork and shorten the construction period, a mechanical formwork device is used. As this formwork device, for example, a rail is laid in a so-called mine floor part in an excavated tunnel, and a plurality of split type supported by a large number of electric or hydraulic jacks on a truck traveling on the rail. Equipped with a movable formwork consisting of unit formwork, the operator adjusts the operation of each jack with the operation lever, etc., and positions each unit formwork at the desired position. It is configured so that the whole can be set.

[0004]

By the way, the finish accuracy of the inner surface of the tunnel lining is greatly influenced by the accuracy of the setting position of the formwork. Therefore, even in the tunnel lining work using such a mechanical formwork device,
In order to increase the accuracy of the set position of the mold, for example, the set position of the mold itself was finely adjusted by using a method such as a transit method or a level method, and a method using a tape.

However, in this conventional method, at least two persons are required to set the entire formwork and to operate the jack for fine adjustment of the set position, and to give an instruction to set the formwork while measuring. However, the workability is poor due to the need for the above-mentioned operator, and thus there is a problem that it takes time to position the formwork. This problem is not so serious when the tunnel excavation speed is slow, but for example, in tunnel construction in a rapid construction of about 18 m / day or 450 m / month, it is very important to shorten the process of each cycle. Becomes

[0006]

Therefore, according to the present invention, the mold can be positioned only by the operator who operates the jack, and the mold can be positioned in a short time. It is an object of the present invention to provide a method for setting a formwork that can reduce the construction period required for the frame setting work.

[0007]

According to a first aspect of the present invention, there is provided a method of setting a formwork for lining in an uncovered tunnel portion following a lining tunnel portion, wherein the lining is completed. While arranging a plurality of laser beam generators in the tunnel part, the target which is the target of the laser beam is arranged in the uncovered tunnel part where the mold should be set, and the laser beam generated by the laser beam generator By irradiating the target with the above, and setting and positioning the mold with reference to each target, the means for solving the above problems is provided.

According to the second aspect of the present invention, the target is provided in the mold to solve the problems.

[0009]

According to the invention described in claim 1, a plurality of targets, which are targets of the laser beam, are arranged in the uncovered tunnel portion where the formwork is to be set, and the covered tunnel is applied to these targets. A laser beam is emitted from a plurality of laser beam generators arranged in the part. Therefore, it is possible to position and set the upper, lower, left and right positions of the mold while visually observing the irradiation position based on the relation with the irradiation position of the laser beam applied to each target with each target as a reference. Therefore, the setting work can be performed quickly.

According to the second aspect of the invention, since the target is provided on the mold, the positions of the upper, lower, left and right of the mold are directly positioned and set while visually observing the irradiation position of the laser beam on the target. can do. Therefore, it is possible to perform the setting work quickly and in a state where an error is unlikely to occur.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying FIGS. FIG. 1 is a partially omitted cross-sectional view showing a relationship between a formwork device to which the present invention is applied and a tunnel, and FIG. 2 is a cross-sectional view showing a relationship between a laser beam and a formwork device and a tunnel. In these figures,
The portion indicated by reference numeral 1 is a tunnel portion that has been lined, and the portion indicated by reference numeral 2 is an uncovered tunnel portion. This formwork device 3 is equipped with a trolley D that can run along rails 5 and 5 laid on invert concrete 4 that is laid to form a flat tunnel floor, and on this trolley D. Equipped with a movable mold K of a split type composed of a plurality of unit molds K1 supported by a large number of electric or hydraulic jacks J, and an operator uses an operation lever or the like (not shown) to operate each jack J.
By adjusting the operation of each unit form K1 and positioning each unit form K1 at a predetermined predetermined position.
It is configured so that the whole can be set.

The movable form K is, in the embodiment, a unit form K1, K2 which is divided into five in the circumferential direction of the tunnel.
The unit molds K3, K4, and K5, which are adjacent to each other, are detachably connected to each other via a hinge 6. When the mold is opened, the jacks of the unit molds K4 and K5, which are the key molds of the unit molds, are contracted to remove the key molds first, and then the remaining unit molds K1. , K2, K3 are moved inward to remove the entire form K. Reference numeral 7 indicates a grout metal fitting, and 8 indicates a pipe for placing concrete.

In this embodiment, as shown in FIG. 1, targets T1 and T2, which are intended to irradiate a laser beam, are provided on the right and left sides of the inner portion of the unit form K1 for the upper surface of the tunnel.
Targets T3 and T4 are similarly provided on the inner portions of the side unit molds K2 and K3, respectively, while each of the targets T1 to T1 is provided on the covered tunnel portion 1 as shown in FIG.
A plurality of laser beam generators L for irradiating the laser beam toward T4 are arranged. A total of four laser beam generators L are arranged above and below and on the left and right of the tunnel cross section, and the optical axes of the respective laser beams B are arranged in parallel with the axis of the tunnel to be lined. Therefore, here, the state in which each laser beam B is applied to the center of each target T1 to T4 is set as an accurate set state of the entire movable mold K.

Here, if the irradiation positions of the respective laser beams B on the respective targets T1 to T4 are displaced to the left, for example, the entire movable form K is positioned to the right by that amount. The required jack J may be operated by the operating lever to correct the set position of the entire form K. This modification is done by one worker for each target T1.
Since the irradiation position with respect to T4 can be directly observed with eyes, the irradiation can be performed easily, easily and quickly as compared with the conventional case where the irradiation is performed in cooperation with the measurer at another position.

In this case, since the targets T1 to T4 are directly provided on the mold K, there is also an advantage that the error can be eliminated when setting the mold and the mold can be set with higher accuracy. In addition, since the targets are arranged vertically and horizontally, it is possible to not only surely grasp the vertical and lateral positional relationship of the entire mold K, but also for each mold, that is, for each unit mold. Can also be grasped. Therefore, it is possible to adjust each unit form. Of course, the targets T1 to T4 may be arranged in a predetermined positional relationship with the mold K. The targets T1 to T4 may be directly attached to the mold K, or may be set using a jig or an appropriate fixture. .

[0016]

As described above, the form setting method of the present invention has the following excellent effects.

According to the first aspect of the present invention, a plurality of laser beam generators are arranged in the covered tunnel portion, and the target of the laser beam is arranged in the uncovered tunnel portion where the mold should be set. Then, while irradiating the laser beam from the laser beam generator to the target, the method of positioning and setting the formwork with each target as a reference was adopted. While visually observing the irradiation position based on the relationship with the irradiation position,
The left and right positions can be positioned and set. Therefore, only the operator who operates the jack can position the formwork, and the work of positioning the formwork can be performed in a short time, which shortens the construction period required for the formwork setting work. can do

According to the second aspect of the invention, since the target is provided on the mold, the upper, lower, left and right positions of the mold are directly positioned and set while visually observing the irradiation position of the laser beam on the target. be able to.
Therefore, the setting operation can be performed quickly and in a state where an error is unlikely to occur.

[Brief description of drawings]

FIG. 1 is a partially omitted sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Tunnel part which has been lined 2 Tunnel part which is not lined 3 Formwork device K Movable formwork T1, T2, T3, T4 Target L Laser beam generator B Laser beam

Claims (2)

[Claims] 1. A method of setting a formwork for lining in an uncovered tunnel portion following a covered tunnel portion, wherein a plurality of laser beam generators are arranged in the covered tunnel portion. On the other hand, the target that is the target of the laser beam is arranged in the uncovered tunnel portion where the mold should be set, while irradiating the target with the laser beam generated by the laser beam generator,
A method of setting a mold, wherein the mold is positioned and set with reference to each target. 2. The mold setting method according to claim 1, wherein the target is provided on the mold.