JPS6349007B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a preliminary inspection device for drain material used in a drain construction method.

(Prior art) In drain construction methods, especially paper drain construction methods, which are used to drain soft ground and promote consolidation, it has been observed that when the mandrel is pulled out, the drain material rises together with the mandrel due to earth pressure, water pressure, etc. In some cases, no drain effect occurred during the period.

For this purpose, a detection part is formed on the mandrel, and a plurality of detected parts are formed at predetermined positions on the drain material side, and the drain material is driven into the ground to a required depth by the mandrel, and the mandrel is pulled out and the drain material is removed. There is a construction method in which the drain material is left in the ground, the mandrel is pulled out, and the drain material is buried in a predetermined position while the position of the detected part is confirmed by the detection part.

However, in the above drain construction method, it is assumed that the pitches between the plurality of detected parts formed on the drain material are formed at equal intervals, and if there are variations or gaps in the pitch of the detected parts of the drain material, In some cases, it was not possible to properly evaluate the detection results of the detected area by the detection part of the mandrel, making it difficult to properly understand the construction status of the drain material.

(Object of the Invention) Therefore, the present invention solves the problem of the variation in the pitch of the detected part of the drain material in the above-mentioned drain construction method.
It is an object of the present invention to provide a preliminary inspection device for drain materials that can appropriately evaluate the results of construction of the drain materials even if there are problems such as omissions.

(Structure of the Invention) The present invention records the pitch of the detected part of the drain material in the calculation section from the outputs of the pitch measuring section and the inspection section, and records the detected pitch of the drain material until it enters the mandrel. The feature is that it is configured to check the pitch of the detection part.

(Example) Hereinafter, the present invention will be explained using the illustrated example.

In Figure 1, drain material coil 2 is attached to mandrel B.
A first embodiment of a drain material preliminary inspection device for preliminary inspection of drain material A supplied from the drain material A was shown.

This preliminary inspection device 1 includes a pitch measuring section 4 and an inspection section 3 that are in contact with a paper drain A fed out from a drain material coil 2. The pitch measuring section 4 is composed of a roller that presses against the drain material A and a rotary encoder, and generates a pulse corresponding to the displacement length of the paper drain A.

In addition, the inspection section 3 is arranged adjacent to the pitch measurement section 4, and has the same configuration as the detection section 8 attached to the mandrel B, and detects it in accordance with the type of the detected section 9 formed on the drain material A. A sensor such as a sensitive coil type or a magnetic sensor type is used, and when the detected portion 9 is detected, a detection signal is output.

In addition, the drain material preliminary inspection device 1 includes a calculation section 5.
and a data recorder 6. Among these, the calculation section 5 inputs the output signals from the pitch measuring section 4 and the inspection section 3, performs arithmetic processing, calculates the pitch of the detected part, and records it in the data recorder 6.

In this way, the pitch data of the detected part 9 written in the data recorder 6 is created by the output from the mandrel movement amount detection section 7 and the detection section 8 when the mandrel B is pulled out after the drain material A is placed. It is compared with the measured pitch value. FIG. 2 shows an example of the reference pitch recorded in advance in the data recorder 6, pitch data for each drain material, and actual measured values when pulling out the mandrel.

(Effects of the Invention) The embodiment of the drain material preliminary inspection device according to the present invention is as described above, and can provide the following effects.

Pitch inspection is performed on the detected part of the drain material within the drain construction method, and even if there are problems such as pitch variations or omissions, the construction results can be appropriately evaluated.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is a graph showing an example of data. DESCRIPTION OF SYMBOLS 1... Drain material preliminary inspection device, 2... Drain material coil, 3... Inspection section, 4... Pitch measurement section, 5... Calculation section, 6... Data recorder, 7...
...Mandrel movement amount detection section, 8...Detection section, 9...
...Detected part, A...Drain material, B...Mandrel.

Claims (1)

[Claims] 1. A detection part is formed on a mandrel, a detected part is formed on a drain material, the drain material is driven into the ground to a required depth by the mandrel, and the mandrel is pulled out to drive the drain material into the ground. In the drain construction method in which the position of the detected part is confirmed by the detection part, the drain material is placed in contact with the drain material supplied to the mandrel when driving the drain material by the mandrel, and generates a pulse corresponding to the displacement length of the drain material. a pitch measuring section that detects a detected part provided at a predetermined position of the drain material and outputs a detection signal; What is claimed is: 1. A drain material preliminary inspection device comprising: a calculation unit that calculates the detection area pitch; and a data recorder that records the detected part pitch calculated by the calculation unit.