JP6257208B2 - Asbestos-containing sprayed rock wool removal surface residual judgment method and jig used for judgment - Google Patents

Description

  The present invention relates to a method for determining residual deposits on a removal surface in asbestos-containing spray rock wool removal work.

  When asbestos-containing rock wool is sprayed on the base material (deck plate, beam, column), the dripping of concrete or mortar often adheres to the base material, so the mortar remains after removing the asbestos-containing rock wool However, since both asbestos-containing sprayed rock wool and mortar contain cement, they cannot be judged visually.

  Further, even if component analysis is performed to determine whether asbestos-containing sprayed rock wool or mortar, if the amount of residual deposits is small, the amount of sample collected becomes insufficient, and it is impossible to determine whether asbestos is contained.

  Furthermore, since there are many places where there is dripping of concrete and mortar adhering to the base material and there are many places, there is a limit to the cost that can be determined per place. You can't spend the money you ask for, and you don't have the time.

  After performing the removal work, as an inspection method to confirm that it has been removed reliably, irradiate the removal treatment surface with an infrared heater, monitor the temperature in the heating range with infrared thermography, and detect the temperature difference compared to the substrate temperature. There is a method for detecting and confirming a certain position (Patent Document 1).

  There is also a method of determining by performing chemical treatment (for example, Patent Document 2 and Patent Document 3).

JP2012-021833 JP2010-078399 JP2008-026269

  However, equipment such as an infrared irradiation device and an infrared thermograph display device is expensive, and it takes time and effort to install these devices, and a simple method is required.

  The determination by scientific processing has a defect that cannot be determined locally, and the removal operation is interrupted for a long time.

  Therefore, although it can be confirmed visually, the problem to be solved is that the asbestos-containing lock that remains due to the sag or mortar of the concrete adhering to the base material after removal work of the asbestos-containing sprayed rock wool and the removal failure This is because it cannot be easily distinguished from wool.

  A pencil having a hardness of 3H or more is held at approximately 45 degrees with respect to the surface of the residual deposit, and is moved while being pressed against the residue with a constant pressing force. Determine.

In the asbestos-containing sprayed rock wool removal surface residue determination method, a pencil with a force guide that maintains the holding angle of the pencil is held, and the lower edge of the isosceles triangle protruding from the pencil is substantially parallel to the surface of the residue. The surface of the residual deposit is moved by holding the pencil so that the asbestos-containing sprayed rock wool is present.

  In this way, the presence or absence of asbestos-containing sprayed rock wool can be determined by the presence or absence of the black line from the pencil that has moved the surface of the residual deposit.

  By visually observing the presence or absence of black lines with a pencil having a hardness of 3H or more, it is possible to easily determine whether or not the residual deposits are wet asbestos-containing sprayed rock wool.

  There is no need to collect a sample, the determination can be made instantaneously, and the removal operation can be interrupted in a short time.

  The locus of the pencil is left and can be easily confirmed by a third party (for example, a construction client).

Test using the force angle guide of the present invention Pencil used for testing JIS scratch hardness (pencil method) test Status of the joint between the deck plate and the beam after removing spray rock wool Interlocking condition of deck plate and beam after spraying rock wool removal Situation of bolts around pillars after removal of spray rock wool (A) is the mark left on the sprayed rock wool with H pencil, (B) is with 2H pencil (A) is a trace left on a 3H pencil sprayed rock wool, (B) is an enlarged photo of the trace.

  Without sampling, a method has been realized in which it is possible to easily determine whether concrete sag or mortar adhered to the substrate before spraying or sprayed asbestos-containing rock wool.

  As shown in FIG. 1, when the 3H pencil 2 with the force guide 1 attached is held and the surface of the residual deposit 3 and the lower side of the force guide 1 are substantially parallel, the pencil 2 is attached to the residual deposit 3. The angle α with the surface can be maintained at approximately 45 degrees. The angle α is maintained and pressed against the surface of the residual deposit 3. The angle retention and pressing force should be learned in advance.

  As shown in FIG. 2 which is the same as the pencil used in the scratch hardness (pencil method) of JISK5600-5-4, the pencil core is scraped off only the xylem, leaving the pencil cylindrical core as it is, and exposed 5-6 mm. Finish the tip of the core flat so that it has a circular cross section.

  The pencil is pushed on the surface of the residual deposit 3 while maintaining a certain pressing force.

  It is visually observed whether a black line is drawn on the movement locus of the pencil 2 on the surface of the residual deposit 3 formed by pushing forward.

  When a black line is drawn on the surface of the residual deposit 3, it is determined that the residual deposit is sag or mortar of concrete.

  When the black line of the pencil 2 is not drawn on the surface of the residual deposit 3, it is determined that the residual deposit 3 remains without removing the asbestos-containing sprayed rock wool.

  FIG. 7A is a photograph showing the result of checking whether or not it is rock wool with an H pencil, and a black pencil remains. (B) shows the case where 2H is used, but it is thin, but the black line of the pencil remains.

  FIG. 8 is a photograph of the result of using a 3H pencil. The black line of the pencil does not remain and is recessed like a scar. (B) is an enlarged photograph thereof.

1 is a force guide 2 is a pencil 3 is a residual deposit 4 is a specimen to be tested (coating) for a scratch test
α is the holding angle between the surface of the DUT and the pencil

Claims (2)

  A pencil having a hardness of 3H or more is held at approximately 45 degrees with respect to the surface of the residual deposit, and the pencil is moved while being pressed against the residual deposit with a constant pressing force. A method for determining the asbestos-containing sprayed rock wool-removed surface, wherein it is determined that asbestos-containing sprayed rockwool remains when there is no wire. The asbestos-containing sprayed rock wool removal surface residual determination method according to claim 1 , wherein a pencil with a force guide for maintaining a holding angle of the pencil is held, and the lower end side of the isosceles triangle protruding from the pencil is the residual The asbestos-containing sprayed rock wool removal surface residual determination is characterized by determining the presence of asbestos-containing sprayed rock wool by moving the surface of the residual deposit by holding the pencil so as to be held substantially parallel to the surface of the object. Method.