JPS61240114A - Survey target apparatus for propelling small caliber pipe - Google Patents

Abstract

PURPOSE:To make it possible to directly read the actual value and direction of displacement quantity, by mounting a transparent plate having concentric circular fluorescent lines at equal intervals to a pilot propelling pipe in the vicinity of the leading end part thereof and enabling telescopic observation from the front or rear side of the transparent plate by a light source. CONSTITUTION:A survey target part 7 is mounted to a small caliber pipe propelling apparatus having a plurality of down-the-hole hammers 6 and concentric circular fluorescent lines 21 are provided to a transparent plate 20 using an acrylic plate at intervals of 5mm. Observation is performed through an observing transit 6 by this apparatus and the images 21a of the fluorescent lines in the visual field 12 of the transit 5 are observed to make it possible to directly read a displacement quantity A.

Description

[Detailed description of the invention] [Industrial application field] This invention applies to underground sewer pipes in civil engineering work.

When propelling a pilot horizontal hole to construct cable installation pipes, etc. using the buried pipe propulsion method.

The present invention relates to a survey target device for small diameter tube propulsion that is attached near the tip of a pilot propulsion tube so as to be able to detect the occurrence of hole bending in the pilot propulsion tube during propulsion.

[Conventional technology]

When constructing a pilot horizontal hole in order to bury a small-diameter sewage pipe, etc. of approximately 250-1000 mmφ using the buried pipe propulsion method, the starting vertical shaft l should be installed as shown in Figure 5.
A poling machine 2 is installed at the tip of the pilot tube 3, a striking hammer is arranged at the tip of the pilot tube 3, an auger is inserted into the pilot tube, and the pilot tube and auger are fed while rotating in opposite directions.

The pilot pipe 3 is propelled toward the reaching shaft 4.

When the tip of the pilot tube 3 is eccentric and the hole bends while the pilot tube 3 is being propelled, it is necessary to detect the hole bend in order to correct it.

In such a case, in order to detect the amount and direction of hole bending, the present inventors installed a target part having a light emitting diode etc. near the tip of the pilot tube 3, and installed this target part in the auger hollow. Japanese Patent Application No. 59-240983 proposes a propulsion device that can correct hole curvature by observing the shaft from behind with Transit 5.

The above-mentioned propulsion device has the tip of its pilot tube enlarged in @lrI4(a), but it incorporates a plurality of down-the-hole hammers 6 in parallel, and the propulsion device starting end is located in the central space surrounded by a group of the hammers. By setting the target part 7 having one light emitting diode near the drill bit of the down-the-hole hammer, if the axis of the tip of the propulsion tube is even slightly eccentric, the center of the transit will be The movement of the disconnected diode can be detected by the transit. Therefore, by operating the eccentric tube 10 containing the down-the-hole hammer 61#, hole bending can be quickly corrected, and this is an excellent device that solves the previous problems.

However, in a target section using %1 light emitting diode, the reading within the field of view of the transit, i.e. the observed displacement observed at the transit, does not indicate the actual displacement, and as the propulsion length progresses, the transshift and the target The actual amount of displacement had to be calculated according to the distance L (see FIG. 5).

FIG. 6 is an explanatory diagram showing this, and FIG. 6(a) shows a front view 1ff1. (b) shows the field of view 12 of the transit observing the target part 7, 13 shows the hair displayed within this field of view, and 14 shows the equidistant line.The interval between the 0 equidistant lines 14 is, for example When the distance from the transit to the observed object is a (for example, when l = 10n, a = 10mm), the reading of the displacement from the center of the light emitting diode image 11a observed in this field of view. When is X, the actual displacement amount A is calculated by the following formula.

A = (L/!L) X (x/a) where L is the distance between the transit and the light emitting diode.

How to directly read the actual amount of eccentricity on a transit without the need for such calculations.

As shown in FIG. 7, a large number of light emitting diodes 11 are arranged at regular intervals in the target section, and the actual displacement A can be directly read from the spacing between the light emitting diodes. However, such a device using a large number of single light emitting diodes has the drawback of being expensive and having a complicated structure.

Furthermore, in the devices shown in FIGS. 6 and 7, the built-in battery needs to be replaced due to its lifespan, and there is also the problem that observation by transit becomes impossible in the event of a failure due to disconnection or the like.

[Problem that the invention seeks to solve]

The present invention further develops the advantages of the above-mentioned previous proposal, that is, the advantage of a device in which a target section is arranged near the tip of the propulsion tube and can be observed by a transit, and directly reads the amount of displacement of the tip of the propulsion tube. This makes it possible to quantitatively understand the amount of correction of hole bending and make appropriate and prompt hole bend corrections, while also avoiding work interruptions due to inability to measure due to power supply failures or battery replacement during excavation. The purpose is to reduce costs by speeding up one operation, and to provide such a target device.

[Means for solving problems]

In order to achieve the above object, the present invention is characterized by the following technical means, which will be explained in terms of No. 1r14.

(1) Transparent plate 20 with concentric fluorescent lines 21 at equal intervals
A target section 7 equipped with the following is used. Concentric fluorescent lines 21
form a dimension line, and the interval between them is a constant dimension. This concentric fluorescent line 21 has a radial straight line 22.
Of course, it may also be provided.

(2) This target section 7 is installed near the tip of the pilot hole excavation pipe so that it can be observed telescopically, that is, so that it can be observed using a transit.

(3) The transparent plate 20 emits fluorescent light when exposed to a light source from either the front or rear direction, so that it can be observed by transit.

[Effect]

FIG. 1(C) shows the field of view 12 of transshift,
The fluorescent line 21 in FIG. 1(b) is observed as 21a,
From the distance between the observed dimension lines, the displacement amount A of the target
can be read directly.

This fluorescence m21 is transmitted to the target 7 as shown in FIG.
It can be observed with the transit 5 by illumination from a light source 9 built into the transit 5, but as shown in FIG. be able to.

Furthermore, as shown in FIG. 4, if a light emitting diode llc is placed a certain distance away from the transparent plate 20 having the fluorescent rays 21, the eccentricity A and B can be reduced. They can be observed simultaneously, a=s i n' ((B-A)/b11
The bending angle α of the tip of the propulsion tube can also be determined by the formula.

〔Example〕

FIG. 1(a) is a longitudinal cross-sectional view of an embodiment in which a surveying target section 7 of the present invention is attached to a propulsion device for small-diameter pipe propulsion having a plurality of down-the-hole hammers. A transparent plate 20 having concentric dimensions consisting of lines 21 is provided in the target section 7, and a battery 8 and a light source 9 are provided for illuminating the transparent plate 20.

In this embodiment, an acrylic plate is used as the transparent plate 20,
The fluorescent lines were concentric circles spaced at 5 mm intervals. Of course, the fluorescent line can also be a collection of points. Further, it is preferable to bond a plurality of transparent plates 20 together and have fluorescent lines engraved on their inner surfaces to increase durability.

When observed using this device on Transit 5 as shown in Figure 2, the first F! As shown in l1(C), the amount of displacement A can be directly read by observing the fluorescent line image 21a within the field of view lz of the observation transshift. Moreover, FIG. 3 schematically shows an example of observation using a laser transit.

〔Effect of the invention〕

The target device of the present invention is suitable for measuring the amount of displacement in small-diameter pipe propulsion construction methods, and the actual value of the amount of displacement and its direction can be directly read, making it easy to perform hole bending prevention and brooming appropriately. In addition, even if trouble occurs with the power supply of the target part during pilot tube propulsion work, the propulsion work can be continued without interfering with displacement measurement, which contributes to cost reduction by eliminating work interruption time and reducing man-hours. do.

Of course, the device of the present invention can also be used as a similar displacement measuring technique, for example, for measuring the displacement of pipes such as pipe roofs.

[Brief explanation of the drawing]

Figure 1C&) is a longitudinal sectional view of the tip of the propulsion tube showing the target device according to the embodiment of the present invention, (b) is a front view of the transparent plate of the target part, and (C) is a transit that is observing the target. Figures 2, 3, and 4 are illustrations of displacement observation, Figure 5 is an illustration of the buried pipe propulsion method, and Figures 6 and 7 are explanations of conventional technology. It is a diagram. 1-... Starting shaft 2... Polling machine 3... Pilot pipe 4... Arrival shaft 5... Transit 6... Down-the-hole hammer 7... Target section 8... Battery 9... Light source 10... Eccentric tube 11... Light emitting diode 12... Transit visual field 13... Hair 20... Transparent plate 21... Fluorescent line

Claims (1)

[Claims] 1. A small-diameter tube propulsion device characterized in that a transparent plate having concentric fluorescent lines at equal intervals is attached near the tip of the pilot propulsion tube so that it can be observed telescopically using a light source from the front or rear of the transparent plate. Survey target equipment.