JPH0581778U - Seismic reflection method - Google Patents

Abstract

(57) [Summary] [Purpose] Good workability, a short work zone, and protection in rainy weather. [Structure] On a lower surface of a rod-shaped main body 1, suspenders 2 arranged at equal intervals are attached. On the suspenders 2, a geophone installation base 3 is suspended and a geophone 4 is installed. ing. On both sides of the main body 1, centering on the fulcrum 10a,
A support lever 10 to which a wheel 11 is rotatably attached is swingably supported. And the support lever 10 is
It is detachable from a fixing jig 8 attached to a fixing member 7 fixed to the main body 1. Also, on the upper part of the main body 1,
A rack portion 13 on which a cable is placed is integrally attached to the main body 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seismic reflection method used for ground surveys when performing civil engineering works such as non-excavation propulsion methods and shield construction methods, and in particular, a geophone for detecting elastic waves reflected in the ground. It relates to a seismic reflection seismic survey system for the simultaneous installation of multiple units.

[0002]

[Prior Art]

 Generally, when performing seismic reflection surveys on the ground using this type of equipment, multiple geophones installed at even intervals on the survey line are connected to the main cable and are connected by a relay cable. It is connected to a data recording device. To facilitate the survey, we installed more than necessary geophones on the survey line and selected the geophones in the measurement range with the data recording device to record the data, which became unnecessary due to the movement of the epicenter. The geophones on the front side of the survey survey line are sequentially removed and moved to the rear side by human power. This will be described with reference to the drawings.

FIG. 2 is a conceptual diagram showing an investigation method using a conventional seismic reflection method. In the figure, a plurality of geophones 4 are placed on the road 20 along the survey line at equal intervals L and connected to the main cable 22, and the main cable 22 is connected via the relay section 24. It is connected to the relay cable 24 which is connected to the data recording device 25. In the case of performing measurement with the exploration device having such a configuration, data is recorded by a plurality of geophones 4 at the same time for one epicenter 27 installed at a certain point. Of the plurality of geophones 4, the geophones in the range measured by the data recording device 25 are the geophones 4a, 4b, 4l, etc. shown in white in FIG. 2 (a). Is selected. Therefore, the geophones 4m, 4n, 4o, etc. shown in black are geophones outside the measurement range.

Next, the epicenter 27 is moved by 2 L in the direction of arrow A as shown in FIG. In this case, the front side geophones 4a and 4b are outside the measurement range and are no longer necessary, so they are moved to the front side on the rear side. At this time, the mainline cable 22 from which the geophones 4a 1 and 4b that have been moved at the same time have been removed is also wound up when it is no longer needed and moved to the rear side. In the measurement range of the geophone in this state, the two geophones behind the above-mentioned measurement range, that is, the geophones 4m and 4n are within the measurement range. This measurement is repeated, and the epicenter 27 is sequentially moved to conduct an investigation.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional exploration device, the front geophone must be moved to the rear, which requires a lot of labor.While the geophone is being moved, a geophone outside the measurement range is prepared as a backup. The number of geophones and main cables must be close to twice the number required for measurement, which requires a lot of labor and time to prepare, clean up, and move the measurement, and is required on the road. Since the length of the working zone is also long, there is a problem that it hinders road traffic. Also, since the main line cable is laid directly, there is a drawback that insulation will be deteriorated in the case of rain and it will be necessary to replace the geophone, or it will not be possible to investigate due to a short rain.

[0006] Therefore, the present invention has been made in view of the above problems or drawbacks of the related art, and its purpose is to provide good workability and a short work zone, and to protect in rainy weather. It is to provide a reflection seismic survey device capable of

[0007]

[Means for Solving the Problems]

 In order to achieve this purpose, the reflection seismic survey apparatus according to the present invention comprises a rod-shaped main body, a plurality of geophone installation pendants suspended at equal intervals on the main body, and installed on this installation base. And a support member that movably supports the main body by a wheel provided at the lower end and that is swingably attached to the main body, and a cable that electrically connects the geophone and the data recording device. And a rack portion integrated with the main body.

[0008]

[Action]

 In the present invention, when the main body is moved according to the movement amount of the epicenter, the geophone installed on the geophone installation base of the main body enters the measurement range. The cable placed on the rack is electrically insulated from the ground.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1A and 1B show a reflection seismic survey apparatus according to the present invention. FIG. 1A is a side view and FIG. 1B is a plan view. In the figure, reference numeral 1 is a steel main body formed in a rod shape, and hanging members 2 arranged on the lower surface at equal intervals L are attached by two screws, respectively. A vibration receiver installation base 3 formed of a heavy material and having a prismatic shape is hung on 2, and a vibration receiver 4 is installed on the vibration reception receiver installation base 3. A pair of substantially U-shaped leg members 6 are attached to both end portions of the lower surface of the main body 1, and fixing members 7 are fixed to side surface portions corresponding to the leg members 6.

Further, on both side surfaces of the main body 1, a support lever 10 is swingably supported around a fulcrum 10a in the vicinity of a position where the fixing member 7 is fixed. A wheel 11 is rotatably attached to the lower end portion, and the support lever 10 is attachable to and detachable from the fixing jig 8 attached to the fixing member. A rack portion 13 on which a cable is placed is integrally bolted to the upper portion of the main body 1, and the upper end surface of the rack portion 13 corresponds to the position of the geophone 4 to receive a vibration. A vessel number display 15 is attached.

With the above configuration, the investigation method will be described below. Corresponding to the position of the epicenter (not shown), position the main body 1 so that the geophone 4 is within the measurement range on the survey survey line, remove the support lever 10 from the fixed shaft 8, and set two points around the fulcrum 10a. The main body 1 is lowered by swinging as shown by the chain line, and the main body 1 is supported and installed on the road by the leg members 6 so that the main body 1 does not lower more than necessary. The main body 1 supported by the leg members 6 has the geophone mount 3 mounted on the road, and the measurement is performed in this state.

Next, the epicenter is moved in order to move to another measurement point. At the same time, the support lever 10 of the main body 1 installed on the road is swung, the support lever 10 is fixed to the fixing member 7 by the fixing jig 8, and the main body 1 is movably supported by the wheels 11. Then, the main body 1 is moved according to the movement amount of the epicenter, and the geophone 4 is placed within the measurement range. At this position, the support lever 10 is again removed from the fixing jig 8, and the main body 1 is placed on the road. Set up at and measure.

In the case of rain, since the geophone 4 is located below the main body 1 and the rack portion 13, it is not wet by rain, and the cables are also arranged and placed on the rack portion 13. Therefore, by covering with a vinyl sheet, it is possible to easily take measures against rain. In addition, since the cables are placed on the rack portion 13 without being laid directly on the road, the insulation is prevented from being deteriorated in rainy weather. Further, since the geophone 4 is fixed to the main body 1, even if the geophone 4 fails during measurement, or installation failure occurs, the geophone number display 15 of the rack portion 13 facilitates recognition. It is possible to do.

[0014]

[Effect of the device]

 As described above, according to the present invention, a plurality of geophones are hung at equal intervals on the main body, the geophones are installed on this installation base, and the main body is movably supported by the wheels provided at the lower end. Since it also has a supporting member that is swingably attached to the main body, it moves to another measurement point, so when moving the epicenter, the wheels of the supporting member should be used according to the movement amount of the epicenter. Can be easily moved, which eliminates the need to manually move the geophone itself and saves labor for that. In addition, the cable can be placed on the rack part and integrated, so that the main body can be moved. This completes the preparation for measurement, installation and removal of the geophone, and the cleanup, which simplifies the measurement work, saves labor, shortens the work time, and improves the efficiency of the measurement work. Exciter and cables also it is only necessary to prepare a preliminary necessary quantity, control work zone on the road of 査時 also requires short, there is an effect that can reduce the impact on the road traffic. Moreover, since the cable is placed on the rack portion, it also has the effect of improving the insulation state of the cable.

[Brief description of drawings]

FIG. 1 shows a reflection seismic survey apparatus according to the present invention,
(A) is a side view and (b) is a plan view.

FIG. 2 is a conceptual diagram showing a measuring method using a conventional seismic reflection method, (a) shows a method of measuring at a hypocenter at a certain point, and (b) shows a method of measuring while moving from the hypocenter. Is shown.

[Explanation of symbols]

 1 main body 3 geophone mount 4 geophone 10 support lever 11 wheels 13 rack section 15 geophone number display

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tsunenori Saito 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Kaoru Nishida 3-1-2 Ikebukuro, Toshima-ku, Tokyo No. Within Diamond Consultant Co., Ltd. (72) Inventor Yasunori Koreishi 3-1-2 Ikebukuro, Toshima-ku, Tokyo Within Diamond Consultant Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A rod-shaped main body, a plurality of geophone mounts suspended at equal intervals on the main body, a geophone installed on the geophone mount, and a wheel provided at the lower end. A rack member integrated with the main body on which a support member for movably supporting the main body and swingably attached to the main body and a cable for electrically connecting the geophone and the data recording device are mounted. Reflection seismic survey equipment characterized by comprising