JP2012002602A - Method for probing, identifying, and removing hazardous body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for removing a hazardous body, capable of accurate probe and identification.SOLUTION: A mechanical excavation is carried out down to a approximate depth where a magnetic body exists in the state that a casing made of stainless steel is pressed in the ground. Subsequently, a magnetometric sensor probes the magnetic body in the casing made of stainless steel while a human-powered excavation is carried out. A hazardous body is thus found and then removed.

Description

  The present invention relates to a method for magnetic exploration of dangerous goods. Specifically, the present invention relates to a method for removing dangerous materials such as bombs remaining in the ground by confirming and exploring dangerous materials while conducting magnetic exploration.

  Conventionally, shells and bombs used in the war have been left unexploded for some reason in the ground (especially in Okinawa Prefecture), and some impact is applied during underground construction such as waterworks. The current situation is that it exploded and suffered human and material damage.

  Therefore, in order to proceed underground construction safely and smoothly, it is important to investigate the dangerous materials caused by these unexploded bombs in advance and remove the dangerous materials by excavating while confirming them.

  As a method for investigating such dangerous materials such as unexploded bombs, magnetic exploration using iron ferromagnetism is generally used.

  This magnetic exploration includes a horizontal exploration for exploring up to 1.0 m above the ground surface and a vertical exploration for detecting the presence of magnetism up to a depth of 1.0 m or deep underground.

  The horizontal exploration is for confirming a dangerous object whose abnormal point position is 1.0 m or less underground, and is performed on the ground surface. Specifically, a dangerous object is confirmed while repeating processes such as magnetic confirmation by a magnetic exploration sensor, excavation, and magnetic confirmation again.

  Vertical exploration is to detect the presence or absence of a magnetic material deep in the basement by drilling an exploration hole with a boring machine or the like and inserting a magnetic exploration sensor therein.

  Here, when the vertical exploration depth is relatively shallow, such as about 1.0 m to 2.0 m underground, no earth retaining is necessary for excavation, and abnormal objects are confirmed by mechanical excavation, manual excavation, and confirmation work. On the other hand, if the vertical exploration depth is relatively deep, about 2.0m to 10m underground, earth retaining is necessary for excavation. In this case, the following construction methods (1) to (3) are employed as the earth retaining method.

(1) Check the hazardous material by mechanical excavation, manual excavation, and confirmation work while repeating the excavation, magnetic confirmation, and further excavation processes by excavating, magnetic confirmation, and further excavation, using liner plate type earth retaining, lightweight steel sheet pile retaining.
(2) After carrying out a large temporary earth retaining by means of steel sheet pile retaining works, etc., check for dangerous materials by excavation, magnetic confirmation and further excavation by mechanical excavation and manual excavation.
(3) Shift the position where there is a dangerous object, change the design of the structure or temporary structure, and install it.

On the other hand, as a magnetic exploration method using a magnetic sensor, for example, a method described in Patent Document 1 is known.
Specifically, in the magnetic exploration method described in Patent Document 1, as shown in FIG. 6, the exploration hole 102 is excavated by press-fitting a non-magnetic casing 101 into the ground by hitting excavation. Next, the magnetic sensor 103 is inserted into the casing 102, and the magnetic sensor 103 is used to measure the change in the amount of magnetic force in the ground to search for the presence of the magnetic material in the ground.

Japanese Patent Laid-Open No. 11-183633

  However, in the case where deep confirmation exploration is necessary for the magnetic exploration of the dangerous materials described above, there is a problem that it becomes a large temporary earth retaining work, which affects the surrounding safety, environment, etc., and increases the process and cost.

  Also, in the vertical confirmation exploration, when checking dangerous materials by repeating excavation, magnetic confirmation, and excavation work, the general earth retaining material is a steel material, and the magnetism of the earth retaining material and the magnetism of the dangerous material overlap, making it dangerous. There is a problem that it is difficult to confirm the position and the object.

  In the case of large-scale temporary work (steel sheet pile earth retaining method or the like), there is a problem that large heavy machinery such as a large crane and a steel sheet pile driving machine is required, and a large installation space is required for that purpose.

  Furthermore, when working in urban areas, there is a problem of adversely affecting nearby offices and houses due to the occurrence of noise and vibration.

  Further, in the invention described in Patent Document 1 described above, a casing having an inner diameter through which a magnetic sensor can be inserted is driven into the soil, and the magnetic sensor is inserted into the casing to measure a change in the amount of magnetism to detect a danger in the ground. It explores the existence of things.

  However, when a dangerous material is found, there is a problem that a large-scale temporary work (such as a steel sheet pile earth retaining method) is required to remove the dangerous material as described above.

  The present invention was devised in view of the above points, and it is an object of the present invention to provide a method for removing dangerous materials by confirmation exploration, which does not require large-scale equipment and can realize accurate confirmation exploration. It is what.

  In order to achieve the above-described object, the method for removing dangerous substances according to the present invention includes a step of confirming a position of a magnetic substance existing in the ground with a magnetic sensor, and a confirmed existence position of the magnetic substance. A step of disposing a casing made of a non-magnetic material around the magnetic body as a substantial center, and excavating at a first excavation speed to a depth near the magnetic body around which the casing is disposed. And a step of finding and removing a magnetic substance with a magnetic sensor while excavating at a second excavation speed lower than the first excavation speed.

  Here, the magnetic sensor is magnetized by placing a casing made of a non-magnetic material (for example, a non-magnetic material such as stainless steel) around the magnetic material, with the confirmed location of the magnetic material as the center. When the dangerous object that is the body is found, the casing does not react to the magnetic sensor, and it is possible to easily identify the exact position of the dangerous object.

  In addition, it is dangerous to perform excavation at a first excavation speed by mechanical excavation or the like up to a depth near the magnetic body, and then perform excavation at a second excavation speed by human-powered excavation or the like that is smaller than the first excavation speed. While excavating quickly to the vicinity of the object (magnetic material), careful and safe excavation can be performed thereafter, and both rapidity and safety can be achieved.

  Here, since there may be multiple magnetic bodies, after removing the magnetic body, the presence of the magnetic body can be confirmed again with the magnetic sensor, and the presence of a further magnetic body can be confirmed. In addition, by removing the magnetic material, it is possible to reduce the possibility of overlooking the presence of the magnetic material, and to remove dangerous substances more sufficiently.

  According to the method for removing dangerous substances according to the present invention, by using a casing made of a non-magnetic material, detection errors of the magnetic material can be reduced, and the confirmation of the magnetic material is clear and safe. Can be done.

It is flow explanatory drawing for demonstrating the construction procedure of the magnetic exploration of an example of the removal method by the confirmation exploration of the dangerous material to which this invention is applied. It is a schematic diagram for demonstrating the search condition of an example of the removal method by the confirmation search of the dangerous material to which this invention is applied. It is flow explanatory drawing for demonstrating the abnormal point confirmation exploration procedure of an example of the removal method by confirmation exploration of the dangerous material to which this invention is applied. It is a schematic diagram for demonstrating the construction situation of the abnormal thing confirmation search of an example of the removal method by confirmation search of the dangerous goods to which this invention is applied. It is a schematic diagram for demonstrating the test | inspection condition by the human power of the abnormal thing confirmation search of an example of the removal method by the confirmation search of the dangerous material to which this invention is applied. It is a schematic diagram for demonstrating an example of the search method of the magnetic body in the conventional underground.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings to provide an understanding of the present invention.

  FIG. 1 is a flow explanatory diagram for explaining the construction procedure of magnetic exploration as an example of a removal method by confirmation exploration of dangerous goods to which the present invention is applied, and FIG. 2 is a diagram of the removal method by confirmation exploration of dangerous goods to which the present invention is applied. It is a schematic diagram for demonstrating an example search condition.

  In an example of the removal method by confirmation exploration of the dangerous material to which the present invention is applied, first, in order to grasp the existence of dangerous materials such as unexploded bombs existing in the ground of the investigation site, the ground surface 1 in the vertical exploration range is used. Perform horizontal exploration. This horizontal exploration is carried out using a double-coil magnetic sensor (not shown) in order to confirm whether there is any dangerous object within 1.0 m below the ground surface 1 (reference S1 in FIG. 1).

  Next, when a dangerous object is confirmed within 1.0 m below the ground surface 1 by horizontal exploration, the removal work is performed by human work. If no dangerous goods are found, a vertical survey is performed.

  In this vertical exploration, the exploration hole 3 is drilled by the boring machine 2, and a magnetic sensor is inserted therein to confirm the presence or absence of a magnetic material. This method of drilling is performed from the ground surface with non-core boring with water. Moreover, in order to protect the hole wall of the exploration hole 3, it inserts as a guide pipe (stainless steel pipe) 4, repeats drilling-exploration work, confirming the safety of a hole bottom from an exploration start position, for example, plan depth (for example, Drilling to an average depth h = 16.06 m) (reference S2 in FIG. 1).

  In this way, the change in the magnetic quantity in the ground is measured by the magnetic sensor within the vertical exploration range, the reaction of the magnetic substance is detected, and the presence of the magnetic substance is confirmed and recorded (reference S3 in FIG. 1).

  After the exploration is completed, the guide pipe 4 is pulled out and the hole is backfilled. This backfilling is divided into a lower layer, an intermediate layer, and a surface layer to prevent settlement, and a backfilling material suitable for each layer is used for each layer (reference S4 in FIG. 1).

  In the determination of the presence or absence of a magnetic material, a wave-like waveform is detected when the magnetic material is present, while the waveform is almost linear when the magnetic material is not present. Analyzing this, calculating the buried depth of the magnetic reaction, the distance from the magnetic sensor to the magnetic material, the amount of magnetism, etc., and creating a report that records the position and size of the magnetic material within the vertical exploration range (Fig. 1) Medium code S5).

  In addition, when the presence of an abnormal object (magnetic material) is not confirmed by the vertical exploration, normal work is performed.

  Next, FIG. 3 is a flow explanatory diagram for explaining an abnormal point confirmation exploration procedure as an example of a removal method by confirmation exploration of dangerous materials to which the present invention is applied, and FIG. 4 is confirmation exploration of dangerous materials to which the present invention is applied. It is a schematic diagram for demonstrating the construction situation of the abnormal point confirmation survey of an example of the removal method by.

  Here, prior to construction, an abnormal point is located on the ground surface based on the report confirming the presence of the magnetic substance in the vertical exploration range, and the arrangement plan of the machines used is made. The ground is checked in advance for the crane installation location and the location where the press-fitting machine is installed, and if necessary, unevenness correction and a laid iron plate are installed (reference S10 in FIG. 3).

  Next, the all-round rotation type or rocking type press-fitting machine and the equipment to be used are carried by a trailer and installed at a predetermined position by a 25 t crane (reference S11 in FIG. 3).

  This all-round rotating or swinging press-fitting machine 10 is installed at the center of the abnormal point position, and is set horizontally by a level and an adjustment jack. Further, a hydraulic hose, a cap tire (not shown), etc. are connected (reference S12 in FIG. 3).

In addition, a trial run such as an all-round rotation type or a rocking press-fitting is performed, and an anti-corotation anchor and a counterweight (not shown) are installed as necessary.
Moreover, the magnetic confirmation of the stainless steel casing, which is a non-magnetic material, is confirmed with a detector (magnetic locator) after carrying the casing.

  Subsequently, the chuck of the upper frame of the all-round rotary type or swing type press-fitting machine 10 is released, and the casing 11 is built with a crane (not shown) (reference S13 in FIG. 3). Then, the chuck is tightened and the casing 11 is fixed.

  Here, the all-round rotation or swing type press-fitting machine 10 is operated to rotate the entire circumference or swing and press-fit while allowing the casing 11 to penetrate into the ground A. Subsequently, excavation and soiling is performed by the hydraulic clam shell 12 (as an example of the first excavation of the present invention) (reference S14 in FIG. 3).

  In the present embodiment, as shown in FIG. 4, in order to use the casing 11 having a height of 2 m and an inner diameter of 2 m, it is necessary to press-fit into the ground A while adding several casings to a depth where an abnormal point exists.

  In this case, the casing 11 from the first stage to the second stage is made of a non-magnetic material (stainless steel in this embodiment), and the subsequently added casing 11 is made of steel. The casings 11 are connected with bolts.

  In this way, excavation and excavation is carried out by the hydraulic clamshell 12 to a depth of 0.5 m above the depth of the abnormal point 13, and rocking press-fitting and excavation work are stopped.

  Next, based on the result analyzed by the abnormal waveform of the vertical magnetic exploration measurement record, a confirmation exploration is carried out in the stainless steel casing 11 as shown in FIG. 5 by manual digging (as an example of the second excavation of the present invention). Implement (reference S15 in FIG. 3).

  Here, when the sensor portion of the magnetic locator 13 (as an example of means for confirming the magnetic substance in the present invention) is moved back and forth and left and right, the output sound of the speaker becomes high and the magnetic reaction product Identify the location.

In this way, the magnetically abnormal reactant is confirmed. For example, when the confirmed reactant is not dangerous like a reinforcing bar, the removal work is performed only by the worker.
If the confirmed reactant is dangerous, such as an unexploded bomb, contact the bomb disposal spot to ensure the safety of the surroundings and then remove it.

  Further, after the magnetic reactant is removed, after confirming the disappearance of the magnetic abnormal reaction by the magnetic locator 13 again, the confirmation exploration is completed.

  Subsequently, after completion of the confirmation exploration, backfilling and casing removal are performed. In this case, earth and sand generated by excavation or the like is used as a backfill material, and each layer 20 cm thick is sufficiently compacted with a tamper or the like so as to prevent subsidence. Further, the drawing is performed by an all-round rotary type or a swinging type press-fitting machine, and backfilling and casing drawing are alternately performed (reference S16 in FIG. 3).

  Further, after the removed casing is removed, the all-round rotating or swinging press-fitting machine and the hydraulic clamshell are removed and carried out (reference S17 in FIG. 3).

  The ground surface after the last removal is leveled and the construction is completed (reference S18 in FIG. 3).

  In this embodiment, stainless steel is used as the non-magnetic casing. However, it is not always necessary to use stainless steel, and for example, a casing made of concrete or titanium may be used.

  Further, the nonmagnetic material only needs to be in a state of being within the magnetic reaction range by the magnetic sensor of the abnormal magnetic reaction, and it is not necessary to configure all the casings to be added from the nonmagnetic material.

  In the removal method by confirmation exploration of dangerous materials according to the present invention having the above-described configuration, a large-sized heavy machine is not used by using a casing made of a non-magnetic material for excavation for confirming and removing abnormal materials. Work can be performed.

  Moreover, since the earth retaining in a casing having an inner diameter of 2 m is possible, excavation work can be performed even in a deep excavation site or a narrow location.

  In addition, by using a casing made of a non-magnetic material, it is possible to prevent misidentification of the detection of magnetic material compared to a steel casing, so that it is possible to confirm abnormal objects clearly and safely. Become.

DESCRIPTION OF SYMBOLS 1 Ground surface 2 Boring machine 3 Exploration hole 4 Guide pipe 10 All-around rotation type or rocking type press-fitting machine 11 Casing 12 Hydraulic clamshell 13 Magnetic locator

Claims (4)

A step of confirming the position of the magnetic substance existing in the ground with a magnetic sensor;
Arranging a casing made of a non-magnetic material around the magnetic material, with the confirmed location of the magnetic material as the center, and
Excavation is performed at a first excavation speed to a depth near the magnetic body around which the casing is disposed, and then magnetically detected by a magnetic sensor while excavation is performed at a second excavation speed smaller than the first excavation speed. A method for removing dangerous substances by confirming and exploring. The method for removing dangerous substances according to claim 1, wherein the presence of the magnetic substance is confirmed again by a magnetic sensor after removing the magnetic substance. The method for removing dangerous substances according to claim 1 or 2, wherein mechanical excavation is performed to a depth near the magnetic substance, and then the magnetic substance is detected by a magnetic sensor while performing manual excavation. 4. A method for removing dangerous substances by confirmation exploration according to claim 1, 2 or 3, wherein a casing made of stainless steel is arranged around the magnetic substance, with the presence position of the confirmed magnetic substance as a substantial center. .

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