JPS645127B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a method for ascertaining and confirming the position of drain material installed in the ground in the paper drain construction method, and also for detecting the amount of subsidence by layer in the ground. It is something.

Problems to be Solved by the Invention In the conventional paper drain construction method, the paper drain material is driven using a casting pipe, that is, a mandrel, but when the casting pipe is pulled out, the paper drain material sometimes rises, and the remaining position of the paper drain material is In other words, it is necessary to check the remaining depth.

On the other hand, when implementing the drain method, it is desirable to measure the amount of subsidence in the ground. Conventionally, complicated instruments are installed in the ground, requiring considerable time and effort to prepare for measurements. Moreover, all conventional electric stratified subsidence meters use a cabtire cable to lower the probe into the measuring tube, so when the cabtire cable is used in the measurement hole, the cable does not stretch. This causes a large error in the measured values.

Additionally, electromagnetic stratified subsidence meters are sensitive to salt and cannot transmit FM radio waves.

Furthermore, when using each of the above-mentioned subsidence meters, the casing pipe deforms due to vertical and horizontal stress underground, and the probe element may not enter the measuring pipe or the subsidence element may shift, resulting in measurement errors. Cheap.

This invention was developed to solve the above-mentioned conventional problems.

Structure of the invention and its embodiments The structure of the gist of this invention is as described in the claims section above, and the main part is that a drain material with a sensing material is cast and its proximity is The purpose of this method is to sense the material to be sensed, which is the drain material, by inserting a sensor device into the ground using a pouring pipe.

The details will be explained below using examples.

Sensed materials 2 are pasted on the paper drain material 1 at required intervals. The paper drain material 1
is placed in the pouring pipe 3, and is poured to a predetermined depth in the ground, and then the pouring pipe 3 is pulled out, leaving the drain material 1 in the ground. On the other hand, a sensor device 4 is attached to a position close to the remaining position of the drain material 1, or a built-in pouring pipe 5 is driven in, and if necessary, the pouring pipe 5 is moved up and down to detect the sensor device attached to the drain material 1. The material 2 is sensed by a sensor device 4. This makes it possible to grasp the position of the drain material 1 in the ground. Furthermore, if the position of the sensed part at the time of detection shows a different value from the previous position when it was driven to a predetermined depth, the difference indicates the displacement at that point, so the amount of consolidation subsidence of the ground can be detected. be able to.

Another method is to build a casing pipe 6 near the remaining position of the drain material 1, use the hole in the casing pipe 6 as a measurement hole, and suspend the sensor device 7, thereby checking the ground level of the drain material 1. It is possible to grasp the position in the ground and further detect the amount of subsidence in the ground from changes in the position of the material to be sensed.

The material to be sensed 2 and the sensor devices 4 and 5 are combinations of a metal body, an oscillator, a magnetized metal plate, a Hall element, and the like. Further, FIG. 5 shows an example of an apparatus for recording and displaying the position of the sensed material 2 attached to the drain material 1 detected by the method shown in FIGS. 3 and 4.

The controller issues signals indicating the movement of each device.

The depth of the sensor device 4 obtained by the depth meter and the signal of the sensed material 2 are converted by a converter and displayed on the recorder and operation meter.

These allow the operator to perform all operations and monitor while operating the construction machine. It can also be recorded on a recorder.

Effects of the Invention This invention has the above-mentioned configuration, and by driving the drain material with the material to be sensed into the ground, the material to be sensed can be easily set in the soil layer part to be measured underground. There is no need for the preparation work required when using a conventional stratified subsidence meter, and it can be used in conjunction with the drain construction method. In addition, the measurement work is simpler, more efficient, and more economical than conventional methods, and the drain method itself can be reliably carried out.

[Brief explanation of drawings]

Figures 1, 2, and 3 are schematic diagrams of the construction state, Figure 4 is a schematic diagram of the construction status of other methods, and Figure 5
The figure is a block diagram of the measurement method. DESCRIPTION OF SYMBOLS 1... Drain material, 2... Sensed material, 3... Casting pipe, 4... Sensor device, 5... Casting pipe, 6...
...Casing pipe, 7...Sensor device.

Claims (1)

[Scope of Claims] 1. A drain material with a material to be sensed is cast into the ground to a predetermined depth using a casting pipe, then the casting pipe is pulled out, the drain material remains, and the drain material is placed in the vicinity of the drain material. The system is characterized by installing a pouring pipe with a sensor device at the location, and detecting the sensing material of the drain material with the sensor device, thereby ascertaining the location of the drain material and detecting the amount of subsidence in the ground. Management method of paper drain construction method. 2. Driving the drain material with the material to be sensed using a driving pipe to a specified depth in the ground, then pulling out the driving pipe to leave the drain material, and erecting a casing pipe in the vicinity of the drain material. A paper drain construction method characterized in that the position of the drain material is grasped by sensing the sensed material of the drain material using a sensor device hanging inside the casing pipe, and the amount of subsidence of the ground underground is detected. management method.