JP2007138487A - Scattering prevention method of dust - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scattering prevention method of dust capable of preventing the attachment of the dust accompanied by demolition work or excavation work to the interior etc. of a building and being dumped by preventing secondary environmental pollution resulting from the dust. <P>SOLUTION: The scattering prevention method of the dust preventing the scattering of the dust accompanied by the work to the outside is characterized by having a dust-proof curtain extension process extending a dust-proof curtain composed of a deformable sheet in the building covering an area aiming at working and forming a working area in the dust-proof curtain, a closed space formation process closing a lower end opening of the dust-proof curtain to be vertically hung down and forming a closed space in the dust-proof curtain after the working is carried out in the working area after the dust-proof curtain extension process and an exhaust reduction process exhausting gas in the closed space to the outside through a dust collection exhausting means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dust scattering prevention method for preventing dust generated during dismantling work or excavation work from scattering outside.

  In recent years, the influence on the human body is regarded as a problem, and improvement of contaminated soil and removal of harmful substances (for example, asbestos) attached to buildings are frequently performed. The improvement of such contaminated soil is carried out by excavating the contaminated soil and then filling it with a modifying material or backfilling good soil. Removal of harmful substances attached to the building removes the harmful substances themselves. Or by dismantling and removing the building.

  By the way, when performing the above-mentioned excavation and dismantling, there is a problem that dust containing harmful substances, pollutants and the like is scattered from the work area to the outside due to the work and causes secondary pollution.

Therefore, in order to prevent dust from being scattered, the work area is preliminarily surrounded by a temporary building and various operations are performed, and the building prevents dust from scattering from the work area to the outside. A method has been proposed in which a dust screen (dust screen) is stretched so as to form a work area indoors, and dust is prevented from scattering from the work area to the outside by the dust screen (for example, Patent Document 1). .
Japanese Patent No. 3698686

  However, according to the method of surrounding the work area only with the building as described above, it is possible to prevent dust from being scattered outside during the dismantling and excavation work, but the dust generated with the work is If the building adheres to the inner surface of the building and the building is a temporary structure, the dust that adheres to the temporary construction or dismantling of the building will cause secondary pollution unless the building is cleaned. There is a problem that it ends up.

  On the other hand, according to the method of extending a dustproof curtain in the building (method according to Patent Document 1), dust can be prevented from being scattered outside during work and from being attached to the building. When disposing of the curtain, the dustproof curtain that has been installed is lowered onto a sheet spread in the building, and the dustproof curtain is wrapped and discarded with the sheet, so when performing the work of folding the dustproof curtain and wrapping it with the sheet There is a risk that an operator may touch the dust remaining on the dust screen, or the dust may be scattered again in the building. In particular, since the work area for excavation and dismantling is generally very wide, a very large size is adopted for the dust screen, resulting in a large number of man-hours for wrapping the dust screen in the sheet, and the above-mentioned problems. It tends to be prominent.

  Further, in Patent Document 1, in order to prevent dust scattering, a dustproof curtain and a sheet are connected to form a bag, and the dustproof curtain is folded while exhausting the air inside, and then connected to the sheet. Although a method of wrapping is also disclosed, according to such a method, since it is assumed that the dust screen is folded, air remains inside, and an external pressing action that occurs when performing work after exhausting As a result, dust may be scattered from an exhaust port (an opening connected to the intake fan) formed in the dust screen. In particular, when covering a large area with a dust screen, a very large size is used for the dust screen, so there is a large amount of air remaining inside, and the probability of dust scattering due to poor handling Becomes higher.

  In addition, such a method requires the work of folding the dustproof curtain so that it is wrapped with the sheet after exhausting, the work of wrapping the dustproof curtain with the sheet, and, as described above, if the remaining amount of air in the dustproof curtain increases, Since the volume in the wrapped state becomes large (bulk specific gravity becomes small), the disposal efficiency of the dustproof curtain tends to deteriorate.

  Therefore, in view of such circumstances, the present invention can prevent the dust generated during dismantling, excavation, etc. from being scattered to the outside, and can suppress the occurrence of secondary pollution due to the dust. It is an object of the present invention to provide a dust scattering prevention method capable of improving the disposal efficiency of a dust screen used to prevent scattering.

  The dust scattering prevention method according to the present invention is a dust scattering prevention method for preventing dust generated during work from being scattered to the outside, and is freely deformable into a building covering a region to be worked. A dust screen extending process for forming a work area in the dust screen, and closing the lower end opening of the dust screen hanging after the work is performed in the work area. A closed space forming process for forming a closed space in the dust chamber, and releasing the dustproof curtain from the tensioned state and forcibly exhausting the gas in the closed space to the outside through the dust collecting exhaust means to make the inside of the dustproof curtain a negative pressure And an exhaust volume reducing step for reducing the volume of the dust screen to reduce the volume. Here, “releasing the dust screen from the stretched state” means that the dust screen is released from the restraint state at a predetermined position forming the work area. For example, the dust screen is dropped on the floor surface. And a concept including a state in which the dust screen is dropped or lowered to the floor side.

  In such dust scattering prevention method, the work is carried out in the work area in the dust screen installed in the building in the dust screen extension process, so that the dust generated by the work is Can be prevented from being scattered and adhered to the inner surface of the building. In addition, since the lower end opening of the dust screen hanging in the closed space forming step is closed to form a closed space in the dust screen, the dust screen will have a bag shape with the closed space formed. In the exhaust volume reduction process, when the gas in the enclosed space is discharged (exhaust) to the outside, the dust screen is deformed and pulled inward along with the internal decompression, and finally shrinks so that the inner surface of the dust screen is substantially in close contact. It will be in a state reduced in volume.

  In this state, as described above, the dust screen is in a state where the inner surface defining the work area is inside and there is almost or no air inside, so that the worker must discard the dust screen. When handling a dustproof curtain in a reduced volume state (for example, storing it in a separately prepared sheet or flexible container), the dust is not touched by the worker and the dust is scattered to the outside even if a pressing action is generated from the outside. There is nothing to do. Since the dustproof curtain is in a reduced volume state, it is not necessary to fold the size of the dustproof screen into a size that can be accommodated in a sheet or the like, and it is possible to improve transportation efficiency and the like related to disposal.

  As one aspect of the present invention, in the closed space forming step, a lower curtain made of a deformable sheet may be connected to the lower end of the dustproof curtain, and the closed space may be defined by the dustproof curtain and the lower curtain. In this way, even if the work area is very wide and the dust screen must be made very large along with this, the lower end opening formed at the hanging part of the dust screen Can be closed smoothly and reliably. In this case, if the dust-proof curtain and the lower curtain are connected to each other so as to close the lower end opening of the dust-proof curtain, they will form a bag shape, and the gas in the closed space will be discharged outside in the exhaust volume reduction process. By doing so, the dustproof curtain and the lower curtain can be reduced in volume without exposing the inner surface to which the dust adheres to the outside.

  As another aspect of the present invention, a building construction step of building a building with a temporary structure so as to cover an area to be worked may be further provided before the dustproof curtain extending step. As described above, according to the present invention, since dust does not adhere to the inner surface of the building, if the building is constructed with a temporary structure, without causing secondary pollution accompanying the construction of the building, The building can be used repeatedly in different places, which can greatly contribute to cost reduction.

  Further, as another aspect of the present invention, the dust-proof curtain extending step includes lifting the dust-proof curtain from the ceiling of the building, and the exhaust volume-reducing step includes lowering the dust-proof curtain from the ceiling side while lowering the gas in the enclosed space. May be exhausted to the outside. In this way, when the decompression of the closed space in the exhaust volume reducing process acts on the dustproof curtain and the lower curtain, the volume can be reduced without applying an excessive pulling force that causes the dustproof curtain to break.

  In the dustproof curtain extending process, after constructing a dustproof curtain extending structure by combining pipes in the building, a dustproof curtain is attached to the dustproof curtain extending structure and a pulley provided on the ceiling of the building is installed. It is preferable that the dust screen is stretched in the building via the dust screen extending structure by connecting the wire hanging through the wire and pulling the wire. In this way, by operating the wire, the dust screen can be easily set in the tensioned state and in the released state. And, since the dust screen is attached to the structure for extending the dust screen, and the dust screen is stretched by lifting these, a mode in which the dust screen is directly lifted with a wire (a local force acts on the dust screen) It will not be torn even if a thin dust screen is adopted.

  As described above, according to the dust scattering prevention method according to the present invention, it is possible to prevent dust generated due to dismantling, excavation, and the like from being scattered to the outside, and to suppress generation of secondary pollution due to the dust. In addition, it is possible to achieve an excellent effect that it is possible to improve the disposal efficiency of the dustproof curtain used to prevent dust scattering.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  The dust scattering prevention method according to the present embodiment is employed for excavation of contaminated soil, dismantling of a structure to which harmful substances are attached, removing work including harmful substances, and the like. In the following description, the case of excavating contaminated soil will be described as an example.

  In the dust scattering prevention method according to the present embodiment, as shown in FIGS. 1 and 2, a building 1 for covering a region A (hereinafter referred to as a work target region) A to be excavated, and the building 1 (described later) A dust screen 2 stretched in the building body 10), a lower curtain 3 (see FIG. 7) for forming a closed space A2 in the building 1 together with the dust screen 2 (see FIG. 7), and a closed space Dust collection exhaust means 4 is used for forcibly exhausting air (gas) to the outside while collecting dust in space A2.

  A temporary structure is employed in the building 1 according to the present embodiment. The temporary structure (building 1) is provided adjacent to the building body 10 so as to prevent the building body 10 covering the work target area A and the dust in the building body 10 from directly coming out. And an auxiliary building 11. And door 12a, 12b which can be opened and closed is provided in the boundary wall of the building main body 10 and the auxiliary building 11, and the boundary wall of the auxiliary building 11 and the exterior. That is, the temporary structure 1 is provided with double doors 12a and 12b for the building body 10, and when one of the doors 12a and 12b is open, the other door 12a and 12b is closed, It is possible to prevent the dust in the main body 10 from directly coming out.

  In the present embodiment, each of the building body 10 and the auxiliary building 11 has a structure (not numbered) in which columns and beams made of steel, lightweight steel, etc. are combined, and a roof that covers the structure. It is a so-called tent house that is composed of a sheet and a wall sheet (not numbered).

  The building body 10 (structure) is mainly used as a framework for stretching the dust screen 2, but the dust cover 2 can be protected from rain and wind by covering the structure with a sheet. Yes.

  The building main body 10 is provided with a plurality of pulleys 15 for hanging wires 16 to be described later on a structure (beam for constructing a ceiling). The pulleys 15 are for tensioning the dust screen 2, and a plurality of pulleys 15 are provided at appropriate positions corresponding to the region where the dust screen 2 is stretched.

  The dust-proof curtain 2 is composed of a deformable sheet, and is composed of a ceiling curtain part 20 that faces the ceiling of the building body 10 and a wall curtain part 21 that faces the inner wall of the building body 10. The dust screen 2 may have a sheet thickness of 50 μm to 150 μm, but in this embodiment, the sheet thickness is 100 μm in order to prevent the self-weight from acting as an excessive load during tensioning. A resin sheet is used. The dust screen 2 may employ a resin sheet such as vinyl chloride, PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), a rubber sheet, a sheet obtained by combining these materials with a woven fabric, or the like. However, the dustproof curtain 2 according to the present embodiment employs a resin sheet made of PP in consideration of later disposal (incineration disposal).

  In this embodiment, since it aims at preventing the scattering of the dust accompanying excavation of contaminated soil, since the work target area A is very wide, the ceiling curtain part 20 and the wall curtain part 21 include a plurality of ceiling curtain parts 20 and wall curtain parts 21. These resin sheets are joined together by thermal welding or the like, so that they are three-dimensionally (three-dimensionally) formed along the ceiling surface and inner wall surface of the building 1. Note that the dust curtain 2 may be a single resin sheet or a single piece formed by connecting a plurality of resin sheets to form the ceiling curtain portion 20 and the wall curtain portion 21. Thus, even if the dust screen 2 is composed of a single resin sheet, if the central portion of the dust screen 2 is lifted to the ceiling of the building body 10, the lifted area becomes the ceiling screen portion 20, and the peripheral portion thereof is It becomes the curtain part 21 in a suspended state.

  In the present embodiment, as described above, in order to cover a wide area, the dustproof curtain 2 is attached to the building body 10 via the dustproof curtain extending structure 22 constructed by combining thin pipes (pipe materials) P. It is stretched. Here, the dustproof curtain extending structure 22 and the attachment of the dustproof curtain 2 to the dustproof curtain extending structure 22 will be described. The dustproof curtain extending structure 22 according to this embodiment forms two pipe members P via joint members J. A plurality of single structures joined together in a letter-shape are connected to each other at their apexes and ends by a straight pipe P, thereby forming a substantially gable roof-like framework.

  A packer 23, which is a resin molded product having a substantially C-shaped cross section, is used to connect the dustproof curtain 2 to the dustproof curtain extending structure 22. That is, the packer 23 has a shape in which a part of the peripheral wall of the resin cylindrical body is opened in a strip shape over the entire length. The packer 23 is fitted to the tube material P through the opening in a state where the dust screen 2 is wound around the tube material P, so that the dust screen 2 is sandwiched between the tube material P and the dust screen 2 with respect to the tube material P. Can be connected. The packer 23 may be fitted over the entire length of the tube material P. However, in consideration of attachment / detachment, it is preferable that the packer 23 is fitted at a plurality of locations and the dustproof curtain 2 is connected intermittently.

  As described above, when the dust-proof curtain 2 is connected to the dust-proof curtain extending structure 22 and the dust-proof curtain 2 is provided so as to cover the dust-proof curtain extending structure 22, the dust-proof curtain 2 is protected against dust even if the packer 23 is removed. Since it cannot be removed (dropped) downward with respect to the curtain extension structure 22, the dustproof curtain 2 is dustproof in consideration of removing the dustproof curtain 2 from the dustproof curtain extension structure 22 in a later process. It is attached from the lower side of the Makuhari structure 22.

  The lower curtain 3 is made of a deformable sheet, like the dust curtain 2, and has an outer periphery that is sized and shaped so that it can be connected over the entire circumference of the lower end of the wall curtain 21 of the dust curtain 2. ing. The lower curtain 3 can adopt a sheet thickness of 50 μm to 150 μm, similarly to the dustproof curtain 2, but in this embodiment, a resin sheet having a sheet thickness of 100 μm is adopted in accordance with the dustproof curtain 2. is doing. In the lower curtain 3, like the dustproof curtain 2, resin sheets such as vinyl chloride, PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), rubber sheets, and woven fabrics are combined with these materials. A sheet or the like can be employed, but the lower curtain 3 according to the present embodiment also employs a resin sheet made of PP in consideration of later disposal (incineration disposal).

  There are various modes of connection between the lower curtain 3 and the dust curtain 2, but considering post-processing and cost, for example, as shown in FIG. The ends are overlapped, and the overlapped portions are engulfed so that they are stopped by a stapler H, or the ends of the dustproof curtain 2 and the lower curtain 3 are connected to each other as shown in FIG. It is preferable to superimpose and sandwich the part between a pair of heat seal bars 6 and 6 with a heat ray or the like and heat-weld them. In this embodiment, the stapler H shown in FIG. A connection method is adopted.

  The dust collection exhaust means 4 is a dust collection device including an intake portion 40 for sucking gas and a dust collection portion 41 for collecting dust contained in the gas sucked by the operation of the intake portion 40. . The intake section 40 includes a suction blower to which an electric motor as a drive source is connected so as to be able to transmit the drive, and the dust collection section 41 is provided with a filter for capturing dust. The dust collecting / exhaust means 4 may change the type of the dust collecting portion 41 in various ways according to the work content (the state of the dust generated during the work (properties of harmful substances, the particle size of the dust, etc.)). In the present embodiment, in the dust collecting portion 41, a pre-filter (medium performance filter: 90% or more by colorimetric method) and a main filter (HEPA (High Efficiency Particulate Air) filter) are used as filters. 3 μ particles (99.97% or more) are employed, and can handle a wide variety of work regardless of the work content. Note that the dust collection exhaust means 4 may be configured by providing a plurality of dust collection devices with different dust collection capabilities in stages.

  Next, the dust scattering prevention method according to the present embodiment will be described including excavation work. First, as shown in FIG. 4, a work target area A including contaminated soil to be excavated is formed in the building body 10. The building 1 is temporarily installed so as to surround it (building construction process). Thereafter, the structure 22 for dustproof curtain extension is constructed by combining the pipe materials P in the building 1, and the end of the wire 16 hangs down through the pulleys 15 provided on the ceiling of the building 1. By connecting to the body 22 and pulling the wires 16..., The dustproof curtain extending structure 22 can be suspended. In addition, the other end side of the wires 16 is wound around a winch W provided in the building 1 (connected to the pillar of the building 1 in the drawing), and by operating the winch W, The dustproof curtain extending structure 22 is pulled up.

  Then, the dustproof curtain 2 is disposed below the dustproof curtain extending structure 22, and as shown in FIGS. 1 and 2, the dustproof curtain extending structure 22 ( Connect to the tube P) and then actuate the winch W.

  Then, the dust-proof curtain extending structure 22 is pulled up via the wires 16 and the dust-proof curtain 2 connected thereto is also lifted together. When the dust-proof curtain 2 is pulled up to a predetermined position, the dust-proof curtain 2 is stretched with respect to the building 1, and the area facing the work target area A becomes the ceiling curtain section 20, and the ceiling curtain A region that hangs down from the outer periphery of the portion 20 and faces the wall surface of the building 1 becomes a wall curtain portion 21. As a result, the region surrounded by the dust screen 2 (the region surrounded by the ceiling screen portion 20 and the wall screen portion 21) becomes a work region A1 for performing excavation work (dust protection screen extending step).

  Then, as shown in FIG. 5, a construction machine Y (for example, a yumbo) and a soil carry-out truck (not shown) are introduced into the work area A <b> 1 through the auxiliary building 11. At this time, a part of the wall curtain portion 21 facing the door 12a provided on the boundary wall between the building body 10 and the auxiliary building 11 is lifted upward to secure an introduction port for the construction machine Y, and the construction machine Y is introduced. Later, the excavation work is started with the portion suspended again.

  In the present embodiment, after the dust screen 2 is stretched in the building 1, an opening (exhaust port) is formed in a part of the wall curtain portion 21 to fluidly connect the dust collecting exhaust means 4, and excavation work Even at times, the dust collecting and exhausting means 4 collects dust. When the dust collecting and exhausting means 4 is operated during the excavation work in this way, the gas in the work area A1 is discharged to the outside, so that the inside tends to become negative pressure, but the dustproof curtain 2 (wall curtain part 21). The dust-proof curtain 2 is maintained in a state where the work area A1 is formed by air entering from the outside through the space between the lower end of the floor and the floor surface. As described above, air enters from the outside through the space between the lower end of the dust-proof curtain 2 (wall curtain part 21) and the floor, but an air supply blower that supplies external air into the work area A is provided. It is preferable to install. In this way, since the air flow is forcibly formed from the outside toward the inside of the work area A, the dust in the work area A can be reliably prevented from scattering to the outside.

  After the excavation work is completed, the construction machine Y is carried out from the work area A1 as shown in FIG. Also in this case, a part of the wall curtain part 21 facing the door 12a is lifted upward to secure the carry-out port of the construction machine Y, and after the construction machine Y is carried out, that part is again suspended.

  Thereafter, as shown in FIG. 7, the dust screen 2 and the lower curtain 3 are connected by the stapler H so as to close the lower end opening of the dust screen 2 (wall curtain portion 21), and the dust screen 2 and the lower curtain are connected. 3 forms a closed space A2 enclosed in a substantially airtight manner (closed space forming step).

  And the dust collection exhaust means 4 is operated, the air (gas) in closed space A2 is exhausted, and the dust which floats is collected. If it does so, the inside of closed space A2 will be pressure-reduced with assistance with exhaust_gas | exhaustion, and the dust-proof curtain 2 and the lower curtain 3 will be sucked inside. In this embodiment, the dust-proof curtain 2 is released from the stretched state by lowering the dust-proof curtain 2 (ceiling curtain section 20) with the exhaust of the closed space A2 (decompression of the closed space A2). The deformation of the dust screen 2 is not hindered. When the ceiling curtain portion 20 (the dustproof curtain extending structure 22) descends downward, the dust collecting and exhausting means 4 is temporarily stopped to remove the dustproof curtain 2 from the dustproof curtain extending structure 22, The exhaustion by the dust collection exhaust means 4 is resumed again.

  Then, as shown in FIG. 8, the gas (air) in the closed space A2 defined by the dustproof curtain 2 and the lower curtain 3 is reduced, and the dustproof curtain 2 and the lower curtain 3 are deformed. The gas in the closed space A2 is almost or completely lost, and the dust screen 2 and the lower screen 3 are brought into close contact with each other and contracted (volume reduction state) (exhaust volume reduction step). In addition, since the area | region which becomes object of excavation work etc. is vast, the dust-proof curtain 2 which covers the area | region is also very large, Therefore Depending on the exhaust capability of the dust collection exhaust means 4, the dust-proof curtain 2 is made dust-proof. After removal from the structure for curtaining 22, the air in the enclosed space A <b> 2 is more efficiently exhausted by an operator assisting the dust-proof curtain 2 to approach the dust collecting exhaust means 4 (exhaust port) side. The dustproof curtain 2 and the lower curtain 3 can be brought into a favorable volume reduction state.

  Then, after the dust-proof curtain 2 and the lower curtain 3 are in a volume-reduced state (shrinked state), the connection between the dust-collecting exhaust means 4 and the dust-proof curtain 2 (wall curtain part 21) is released, and the dust collecting exhaust means 4 The exhaust port connected to is closed. In other words, since the resin sheets constituting the dust screen 2 and the lower screen 3 are generally elastic, the restoring force of the dust screen 2 itself acts and the exhaust port to which the dust collecting exhaust means 4 is connected. In order to prevent air from entering, an opening closing member (not shown) made of a resin sheet, an adhesive tape, or the like is adhered to the dust-proof curtain 2 in an airtight manner to close the exhaust port.

  In this state, the dust that remains attached to the dust screen 2 is on the inner surface side that defined the closed space A2, so that when the operator handles the dust screen 2 and the lower screen 3 in the reduced volume state, Even if the dust contains harmful substances without touching, it can work safely. Further, since there is almost no air inside the dustproof curtain 2 and the lower curtain 3 in the reduced volume state, dust is not scattered from the exhaust port even if an external pressing action occurs when closing the exhaust port. . In the present embodiment, the exhaust port is closed with the opening closing material, so that no dust leaks after that.

  And after accommodating the dust-proof curtain 2 in the volume-reduced state in a flexible container etc. and carrying it out, a series of work is completed by dismantling the building 1. In addition, the dust screen 2 carried out is disposed of in a waste disposal site such as an incinerator.

  As described above, according to the dust scattering prevention method according to the present embodiment, the work area A1 is formed by stretching the dustproof curtain 2 in the building 1 covering the work area A, and the work area A1 is formed. Therefore, the presence of the dust screen 2 can prevent the dust from being scattered outside and the dust from adhering to the building 1. Therefore, even if a temporary structure is adopted for the building 1 and the temporary construction and dismantling are repeated, cleaning work and cleaning work for the building 1 are not required, and other dust is generated as the building 1 moves. It is possible to reliably prevent secondary pollution.

  Then, after the excavation work is completed, the lower curtain 3 is connected to the dust-proof curtain 2, so that the inner surface to which dust is attached can be confined in the closed space A2, and the closed space A2 is further closed. By exhausting with the dust collection exhaust means 4, dust containing harmful substances and the like can be collected and discarded. The collected dust may be discarded together with the filter, or if it has a dust separation mechanism for separating the dust attached to the filter, only the dust may be sealed and discarded. Good.

  Further, by exhausting the closed space A2, the dust-proof curtain 2 and the lower curtain 3 are contracted to be in a volume-reduced state, so that it is possible to improve transportation efficiency and reduce processing costs associated with disposal. In addition, since there is no or very little air remaining in the interior, it is possible to prevent dust from being scattered through the exhaust port when handling the dustproof curtain 2 in a reduced volume state. . Furthermore, since the inner surface of the dust screen 2 to which dust adheres is not exposed to the outside, the operator does not touch the dust, and even if the dust contains harmful substances, the work can be performed safely.

  In the present embodiment, the dustproof curtain 2 is lowered when the closed space A2 is exhausted. Therefore, it is assumed that the dustproof curtain 2 and the lower curtain 3 are deformed as the closed space A2 is exhausted (decompressed). However, it is possible to prevent a situation in which an excessive force acts on them and breaks them.

  Further, since the dustproof curtain extending structure 22 is used to stretch the dustproof curtain 2, even if a thin resin sheet is used for the dustproof curtain 2, the dustproof curtain 2 can be smoothed without being damaged. And it can be reliably stretched in the building 1.

  The dust scattering prevention method of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  In the above embodiment, the excavation work of contaminated soil has been described as an example. However, the present invention is not limited to this. For example, the removal work of harmful substances such as asbestos, and buildings and structures containing harmful substances. Of course, it may be a dismantling work or the like.

  In the above embodiment, the lower curtain 3 is connected to the lower end of the dust-proof curtain 2 in order to close the lower-end opening of the dust-proof curtain 2 (wall curtain portion 21) stretched in the building 1. May be adopted as necessary. That is, when the entire lower end portion of the dust screen 2 can be brought close, the lower end portion of the dust screen 2 is closed without providing the lower screen 3 so that the closed space A2 is formed in the dust screen 2. May be. As described above, in order to form the closed space A2 with the dust-proof curtain 2 itself, it is preferable that the wall curtain portion 21 is made longer than the height from the upper end to the floor surface. In this case, for example, a string or the like is inserted into the lower end portion of the wall curtain portion 21 over the entire circumference, and the lower end opening of the wall curtain portion 21 is contracted by pulling the string when work such as excavation is completed. The closed space A <b> 2 can be formed by a simple operation if it is made like a so-called purse that is closed by diameter.

  In the above-described embodiment, the exhaust port connected to the dust collecting and exhausting means 4 is closed after the dust-proof curtain 2 is reduced in volume. However, the present invention is not limited to this. You may make it accommodate in a sheet | seat or a flexible container in the state reduced in volume. However, considering the restoring force of the dust-proof curtain 2 itself as described above, it is preferable to close the exhaust port before accommodating in the sheet or the like.

  In the above embodiment, the tent house is used as the temporary structure for the building 1, but the present invention is not limited to this, for example, the work of disposing of the waste containing harmful substances left in the existing building When performing the above, the existing building may be used as the building 1.

  In the above-described embodiment, a plurality of single structures in which the pipe members P are connected in a U-shape are connected to form the dustproof curtain extending structure 22 in a gable roof-like (triangular roof-shaped) framework. The installation structure 22 is not limited to this form. For example, a plurality of arch-shaped single structures are connected to form a saddle-shaped framework, or a tubular framework is formed by arranging the pipe members P in a lattice shape. Or you may. That is, when the dustproof curtain 2 is stretched via the dustproof curtain extending structure 22, the shape of the dustproof curtain extending structure 22 may be appropriately changed according to the environment where the dustproof curtain 2 is stretched. .

  In the above-described embodiment, the dustproof curtain extending structure 22 is configured by connecting a plurality of pipe materials P. However, the structure is not limited thereto. For example, each tube material P is configured as a single unit without being connected, Each pipe P may be hung by wires 16. Even in this case, the pulling action by pulling the wires 16 does not directly act on the dust screen 2, and the same actions and effects as in the above embodiment can be achieved. However, since the dust screen 2 is deformable, when the pipe members P are made independent, when pulling the wires 16, the dust screen 2 may swing in an unspecified direction, and an unnecessary force may act on the dust screen 2. Therefore, from the viewpoint of preventing the dust screen 2 from being damaged, it is preferable to perform the same as in the above embodiment.

  In the above embodiment, the dust screen 2 is stretched by pulling the wires 16. However, the present invention is not limited to this. For example, the dust screen 2 is attached to the ceiling of the building 1 (building body 10). For example, the connection may be made detachably. However, considering that the dustproof curtain 2 is released from the stretched state in the exhaust volume reducing step, it is preferable to perform the same as in the above embodiment.

  In the above embodiment, the dust screen 2 is stretched on the building 1 via the dust screen stretching structure 22, but the present invention is not limited to this. For example, when the work target area A is narrow, etc. The dust screen 2 may be directly stretched on the building 1. In this case, since the weight of the dust screen 2 acts as a suspending force on the dust screen 2, it is preferable to make the dust screen 2 thick so that damage such as tearing does not occur. However, it is assumed that the thickness is such that deformation is not hindered in the exhaust volume reduction process. Even in this case, since the dust screen 2 is suspended from the building 1, a hook-like piece is provided at a portion connecting the wires 16 or the like, or a reinforcing sheet is attached to increase the strength. It is preferable to increase it.

  In the above embodiment, when the inside of the closed space A2 is exhausted, the dustproof curtain 2 is moved downward to allow the deformation of the dustproof curtain 2 and the lower curtain 3 due to internal decompression. Of course, the closed space A2 may be exhausted after the dust-proof curtain 2 in the installed state is previously lowered downward. When the dustproof curtain extending structure 22 is employed, it is preferable to evacuate the dustproof curtain 2 after removing it from the dustproof curtain extending structure 22 in advance.

  In the above embodiment, the packer 23 is used to connect the dust screen 2 to the structure 22 for extending the dust screen. However, the present invention is not limited to this. For example, a resin sheet is punched on the outer surface of the dust screen 2, etc. The hook piece formed in this manner may be attached, and the hook piece and the dustproof curtain extending structure 22 may be attached with a string material, or the dustproof curtain 2 may be attached to the building structure with an adhesive tape. .

  In the above embodiment, the dust screen 2 and the lower curtain 3 are connected by the stapler H. However, as described above, the dust screen 2 and the lower curtain 3 are connected by heat welding, for example, Similarly to the case where the dustproof curtain 2 is connected to the dustproof curtain extending structure 22, as shown in FIG. 9, the pipes P ′ and the packer 23 ′ may be used for connection. However, in order to efficiently reduce the volume of the dustproof curtain 2 and the lower curtain 3 in the exhaust volume reduction process, these deformations must not be hindered. Therefore, when the pipe material P ′ and the packer 23 ′ are used, the pipe material P Needless to say, 'and the packer 23' are formed to be deformable like a resin hose or a rubber hose.

  Then, in order to connect the dust screen 2 and the lower curtain 3 with the pipe material P ′ and the packer 23 ′, the lower end of the dust screen 2 and the end of the lower screen 3 are overlapped as shown in FIG. In this state, the tube P 'may be wound as it is, and the packer 23' may be fitted to the wound portion. However, considering the blocking property between the closed space A2 and the outside, as shown in FIG. The lower end of the dust-proof curtain 2 and the end of the lower curtain 3 are overlapped so that the part is folded one or more times, the folded part is wrapped around the pipe P ′, and the packer 23 ′ is fitted to the part. It is preferable to do. In this way, even if the plurality of packers 23 ′ are fitted at intervals in the axial direction of the pipe material P ′ and the dustproof curtain 2 and the lower curtain 3 are not connected between the packers 23 ′, the dustproof By overlapping and folding the curtain 2 and the lower curtain 3, communication between the closed space A2 and the outside can be prevented.

  Further, the dustproof curtain 2 or the lower curtain 3 may be modified so that the dustproof curtain 2 and the lower curtain 3 can be connected. Specifically, as shown in FIG. 10, the belt body 25 in which a plurality of holes 26 through which the string 27 is inserted is formed in the longitudinal direction is placed along one end of the dustproof curtain 2 or the lower curtain 3. Thus, the end located on the center side of the dust screen 2 or the lower curtain 3 in the width direction of the belt 25 is adhered or welded S to the dust screen 2 or the lower screen 3, and the dust screen 2 or the lower screen 3 may be formed by forming a plurality of holes 26 corresponding to the holes 26 at the other end and inserting a string 27 through the holes 26.

  In this case, as shown in FIG. 10 (a), the end of the dust screen 2 or the lower screen 3 and the belt body 25 are sewed straight in the longitudinal direction of the belt body 25 so that the string 27 is inserted. As shown in FIG. 10B, the string 27 may be inserted so as to sew in a zigzag pattern in the longitudinal direction. Even in this case, a sufficient overlap between the dust-proof curtain 2 and the lower curtain 3 can be obtained, dust does not leak to the outside, and the pressure in the closed space A2 is reduced by exhausting the dust collection exhaust means 4. Can withstand enough.

  In the above embodiment, the entire work target area A is covered with the single dust screen 2, so that the work area A1 consisting of one space corresponding to the entire work target area A is defined. However, the present invention is not limited to this. For example, when the work target area A is very large, the work target area A is divided and covered by a plurality of dust screens 2 to define a plurality of work areas A1 independently. A process is performed every A1, or the work area A is partially covered with the dust screen 2, and the work area A1 is partially defined with respect to the work area A and repeatedly performed. Finally, the work on the entire work target area A may be completed.

  The present invention is in a field involving excavation work of contaminated soil containing harmful substances, dismantling work of buildings and structures containing harmful substances such as asbestos, and other various work to be performed on those containing harmful substances. It is particularly useful.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing for demonstrating the member used for the dust scattering prevention method which concerns on one Embodiment of this invention, and a dust-proof curtain extending process, Comprising: Sectional drawing of the building which covered the work object area | region is shown. FIG. 2 is a cross-sectional view taken along the line II in FIG. 1. It is a fragmentary sectional view for demonstrating the connection aspect of a dust-proof curtain and a lower curtain in the dust scattering prevention method which concerns on the embodiment, (a) is the state which connected the dust-proof curtain and the lower curtain with the stapler. (B) shows a state in which the dust-proof curtain and the lower curtain are connected by thermal welding. Explanatory drawing for demonstrating the building construction process of the dust scattering prevention method which concerns on the embodiment is shown. Explanatory drawing for demonstrating when a construction machine is introduce | transduced into the work area | region formed at the dust-proof curtain extension process of the dust scattering prevention method which concerns on the embodiment is shown. Explanatory drawing for demonstrating when a construction machine is carried out from the work area | region formed at the dust-proof curtain extending process of the dust scattering prevention method which concerns on the embodiment is shown. Explanatory drawing for demonstrating the enclosed space formation process of the scattering prevention method of the dust which concerns on the embodiment is shown. Explanatory drawing for demonstrating the exhaust volume reduction process of the dust scattering prevention method which concerns on the embodiment is shown. It is explanatory drawing for demonstrating the connection aspect of the dust-proof curtain and lower curtain which concerns on other embodiment of this invention, Comprising: (i) is a pipe material in the state which accumulated the edge parts of the dust-proof curtain and lower curtain. Shows the state of being wound around and connected via a packer. (B) is the state where the ends of the dust-proof curtain and lower curtain are overlapped, and the part is folded and wrapped around the pipe material and connected via the packer. Indicates. It is explanatory drawing for demonstrating the connection aspect of the dust-proof curtain and lower curtain which concerns on another embodiment of this invention, Comprising: (a) is a straight line with a string through a strip-shaped piece between a dust-proof curtain and a lower curtain. (B) shows a state where the dustproof curtain and the lower curtain are stitched together in a zigzag pattern with a string through a strip-shaped piece.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Building, 2 ... Dustproof curtain, 3 ... Lower curtain, 4 ... Dust collection exhaust means, 10 ... Building main body, 11 ... Auxiliary building, 12a, 12b ... Door, 15 ... Pulley, 16 ... Wire, 20 ... Ceiling curtain part , 21 ... wall curtain part, 22 ... structure for dustproof curtain extension, 23 ... packer, 40 ... air intake part, 41 ... dust collecting part, A ... work target area, A1 ... work area, A2 ... closed space, J ... joint Member, P ... pipe material, W ... winch, Y ... construction equipment

Claims (5)

  It is a dust scattering prevention method that prevents dust generated during work from scattering to the outside, and a dustproof curtain made of a deformable sheet is stretched in the building covering the area to be worked on, A dustproof screen extending step for forming a work area in the dustproof screen, and a closed space forming step for closing a lower end opening of the dustproof curtain hanging after working in the work area and forming a closed space in the dustproof screen; The dust-proof curtain is released from the tensioned state, the gas in the enclosed space is forcibly exhausted to the outside through the dust collection exhaust means, and the dust-proof curtain is contracted by reducing the pressure inside the dust-proof curtain to reduce the volume. A dust scattering prevention method comprising: an exhaust volume reduction process.   2. The dust scattering prevention method according to claim 1, wherein in the closed space forming step, a lower curtain made of a deformable sheet is connected to a lower end of the dust screen, and the closed space is defined by the dust screen and the lower curtain.   The dust scattering prevention method according to claim 1 or 2, further comprising a building construction step of constructing the building with a temporary structure so as to cover a region to be worked before the dustproof curtain extending step.   The dustproof screen extending step includes lifting and extending the dustproof screen from the ceiling of the building, and the exhaust volume reducing step exhausts the gas in the enclosed space to the outside while lowering the dustproof screen from the ceiling side. The dust scattering prevention method according to any one of the above.   The dust-proof curtain extension process consists of constructing a dust-proof curtain extension structure by combining pipes in the building, and then attaching the dust-proof curtain to the dust-proof curtain extension structure and via a pulley provided on the ceiling of the building. The dustproof curtain is stretched in the building via the dustproof curtain stretching structure by connecting a hanging wire and pulling the wire. Dust scattering prevention method.

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