JP4915580B2 - Construction method of ground vibration propagation suppression structure - Google Patents

Description

  The present invention relates to a method for constructing a structure for suppressing ground vibration propagation, and in particular, effectively reduces vibrations transmitted from the vibration source of a processing device such as a factory and vibration sources such as railway vibration and road traffic through the ground. The present invention relates to a method for efficiently creating a ground vibration propagation suppressing structure that can suppress adverse effects on existing facilities such as neighboring houses.

  Vibration pollution is caused by vibrations that occur during the operation of presses installed in factories and other offices, and vibrations that occur when vehicles pass on the road when passing through trains. It is known to cause an adverse effect due to vibration. For example, residents in the vicinity of the vibration source can experience indirect vibrations that cause objects in the room to shake in addition to vibrations that are transmitted directly, and many people feel sensory and physiological discomfort and pain.

  In order to block the low-frequency vibration from such a vibration source from propagating through the ground, the vibration isolation as shown in each figure of FIG. 5 is used to partition between the vibration source and the house on the receiving side. Measures for constructing the groove 55 may be taken. In FIG. 1 (a), from a vibration generating source 51 such as a press installed in the factory 50, a vibration as schematically shown by a broken line as an example propagates in the ground and spreads around. In the illustrated vibration propagation countermeasure work, a medium layer is provided to block the ground through which vibration is propagated by filling the empty anti-vibration groove 55 with water or water 57, and shear waves (transverse waves) in the horizontal direction are provided. Measures are taken to prevent the vibration from reaching the surrounding private house 60 and the like.

Recently, underground grooves have been formed in the ground, and the inside of the interior has a low volume modulus of elasticity such as rubber and polystyrene beads, which suppresses the propagation of ground vibrations by mixing filling materials that do not transmit dense waves and shear waves. An underground wall structure has been proposed (Patent Document 1). In order to realize a state close to the vibration blocking effect of the empty groove, a structure in which a gas cushion in which a gas is sealed in a balloon having a predetermined shape is sandwiched in the groove has been proposed (Non-Patent Document 1).
See JP 2001-98574. Fudo Tetra Co., Ltd., “Development and commercialization of hybrid (triple structure) vibration isolation wall construction method using gas cushion”, [online], 2006, [June 24, 2007] <URL: http: // www.fudotetra.co.jp/release/fudo/news20040728.html>

  By the way, in the anti-vibration groove 55 shown in FIGS. 5A and 5B, even when a space where nothing is filled is formed between the retaining walls, cut beams and the like are arranged in multiple stages, so that vibration propagates through these cut beams. There is a risk of it. Therefore, it is necessary to make the mountain retaining wall on each side self-supporting with a mountain anchor or the like. Therefore, there is a problem that the space for enabling the anchor placing operation or the like must be ensured, and the scale of the groove becomes larger than in the case where only the vibration isolation performance is considered. In addition, when the water 57 is filled, it must be constructed in the aquifer or a water-proof mountain retaining wall, and a pump (not shown) is operated to manage the amount of water in the anti-vibration groove 55. There is a need to do. Further, the anti-vibration groove 55 filled with water 57 as a medium can achieve vibration suppression because the shear wave propagation in the horizontal direction is expected to absorb energy due to sloshing or the like, but the dense wave (longitudinal wave) is incompressible. Since it propagates as it is in the water as a fluid, the effect of vibration suppression cannot be obtained.

  In the wall structure in which the polystyrene foam (EPS) beads disclosed in Patent Document 1 are mixed, since the specific gravity of the EPS beads is small, uniform mixing with the soil cement as a matrix is difficult, and the soil cement has a predetermined viscosity. It is necessary to prepare an artificial clay material, and it is difficult to determine the blending of wall materials such as determining the amount of EPS beads to be added, and further, measures for preventing separation of EPS beads during actual wall construction are problematic.

In addition, in the vibration isolation wall using the gas cushion disclosed in Non-Patent Document 1, in order to fix the gas cushion having buoyancy at a fixed position in the groove, it is necessary to fix it to a steel sheet pile previously constructed. Further, even during use, the volume of the cushion decreases due to the earth water pressure, and there is a possibility that the hole wall needs to be retained or the long-term effect is reduced.
. Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, to arrange a pullable core material in parallel in the groove, to construct a soil cement wall, and to fix the core material after solidifying the soil cement It is an object of the present invention to provide a ground vibration propagation suppression structure creation method that eliminates and forms parallel empty grooves in a groove so as to reliably prevent propagation of dense waves in the ground.

  In order to achieve the above object, the present invention creates a wall body by filling a solidified material in a continuous groove excavated in a predetermined range of the ground between a vibration source and a facility affected by the vibration source. While the solidified material is in an unsolidified state, a bag-like sheet capable of accommodating a cylindrical core material in an individual bag-like portion is provided in a planar shape in the extending direction of the continuous groove, and a cylindrical core is provided in each bag-like portion. After the material has been accommodated and the solidified material has reached the self-supporting strength, the cylindrical core material is pulled out from the bag-like portion, and a plurality of cylindrical voids are arranged in the wall in the extending direction of the wall. Features.

  When the wall is formed by filling the solidified material in the continuous groove excavated in a predetermined range of the ground between the vibration generation source and the affected facility, the solidified material is in an unsolidified state, A bag-like sheet containing a cylindrical core material is lined up in the direction of extension of the continuous groove and submerged, and after the solidified material has reached a self-supporting strength, the cylindrical core material is pulled out from the bag-like portion, and into the wall body. A construction method of a ground vibration propagation suppressing structure, wherein a plurality of cylindrical gaps are arranged in an extending direction of a wall body.

  When the wall is formed by filling the solidified material in the continuous groove excavated in a predetermined range of the ground between the vibration generation source and the affected facility, the solidified material is in an unsolidified state, Substituting and filling a low-elasticity filler into the void generated when the cylindrical core material is pulled out from the bag-like sheet by burying the bag-shaped sheet containing the cylindrical core material in the extending direction of the continuous groove, A plurality of cylindrical low-elastic fillers are arranged in the wall in the extending direction of the wall.

  It is preferable that the bag-like sheet is buried in the solidified material of the continuous groove in a wound state, and the inside of the solidified material is developed along the extending direction of the continuous groove.

  It is preferable to construct a ground vibration propagation suppressing structure wall body by filling the cylindrical gap with a low elastic filler.

  According to the present invention, an air groove as a ground vibration propagation suppression structure is formed on a ground wall provided in a predetermined range of the ground between a vibration source and a facility affected by the simple construction method. The propagation of vibration vibration energy by the empty groove can reliably attenuate the vibration propagation from the vibration source to the facility.

  Hereinafter, as the best mode for carrying out the ground vibration propagation suppressing structure creation method of the present invention, the following embodiments will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view schematically showing a construction example of an embodiment of an underground wall as a ground vibration propagation suppressing structure of the present invention. As shown in the figure, for example, a vibration generator 1 such as a press installed in a factory or the like suppresses ground vibration propagation over a predetermined width with an existing building 60 in the vicinity thereof. The underground wall 10 as a structure is constructed. In the figure, the state of propagation of vibration from the vibration generating source 1 in the ground 3 is schematically shown in a concentric circle shape (hemisphere). In this way, the generated vibration propagates in the ground 3 and is almost absorbed by the underground wall body 10 as a ground vibration propagation suppressing structure located between the existing building 60 and the underground wall body 10. The influence of vibration on the existing building 60 located outside can be minimized.

  In this embodiment, the vibration source 1 and the existing building 60 are separated by about 80 m, and the underground wall 10 is located at a position of about 60 m from the vibration source 1 with a width W = 80 m, a wall thickness B = 1 m, It consists of a wall length L = 12 m. In general, the size (extension (width), wall thickness, wall length) of the underground wall 10 is such that vibration is generated between the vibration level of the generated vibration and the existing building 60 such as the vibration source 1 and a neighboring dwelling unit. In consideration of the ground characteristics of the ground 3 that propagates, the scale is such that the influence of diffraction at the end of the wall 10 is minimized, and the site of the existing building 60 is not affected.

Hereinafter, a first embodiment of the construction method of the underground wall 10 as the ground vibration propagation suppressing structure will be described with reference to FIGS. 2 (a), 2 (b), and FIG.
Fig.2 (a) is the fragmentary perspective view which showed a part of surface of the underground wall body 10 of the ground vibration propagation suppression structure which continuously arrange | positioned the empty groove 11 constructed by the present Example. As shown in the figure, the resin bag-like sheet 12 embedded so as to continue the adjacent empty grooves 11 is in close contact with the peripheral surface of the cylindrical empty groove 11, and the ground vibration In addition, the water shielding effect is added to the wall body 10. FIG. 2 (b) is a partial perspective view showing a part of the surface of the ground vibration propagation suppressing structure wall body in which the empty groove 11 shown in FIG. 2 (a) is filled with EPS beads as a low elastic filler. . The construction procedure of the ground vibration propagation suppressing structure wall will be described below.

  FIG. 3A is a ground cross-sectional view schematically showing a part of a soil cement wall body created by a known underground wall construction method, cut by a vertical surface on the ground surface. In this type of construction method, in parallel with the excavation of the groove to be the predetermined wall body 10, an unsolidified material obtained by mixing a cement-based solidified material into the excavated soil material (hereinafter represented by soil cement 14 in this embodiment). ) Is supplied to the part where the excavating blade of the excavator rotates and returns to the excavated area, and this mixture is hardened in the groove, so that the groove is excavated without being held in a stable liquid or the like. At the same time, a continuous underground wall 10 can be constructed. Next, before the soil cement 14 is solidified, the resin bag-like sheet 12 wound in a roll shape as shown in FIG. 3B is laterally drawn so as to be unwound in the soil cement 14. expand. For lateral development of the resin bag-like sheet 12, a sheet developing device used in the “latenavi wall method” as a known technique can be used.

  As shown in FIG. 3 (c), the resin bag-like sheet 12 is a bonded portion in which two original fabric sheets having a predetermined height (depth) are thermally welded at predetermined intervals. By partitioning with 12a, it is the bag-like sheet | seat 12 with which the cylindrical part continued in the horizontal direction, and each part is a bottomed cylindrical shape in a present Example. As the material, a low-density polyethylene-based polyolefin sheet which is a thermoplastic resin capable of forming a bag shape and has strength and durability is used, but a polyurethane-based sheet and a polypropylene-based polyolefin sheet are also suitable.

  The resin bag-like sheet 12 is manufactured as a continuous sheet with the bag-like part partitioned by the joining part 12a at a predetermined interval. Each bag-like part has a cylindrical shape as shown in FIG. The width is set to a circumferential length so that the core material can be inserted with a margin. The seat height (depth) is set substantially equal to the wall height (groove depth) of the underground wall 10. In the present embodiment, the total length of the sheet into which the five cylindrical core members 20 can be inserted is shown, but the length can be appropriately set according to the wall length of the underground wall 10. Further, as shown in FIG. 3B, the initial shape may be wound up in a roll shape, or folded in a bellows shape in the width unit of the bag, and the inside wall 10 It is preferable that the film is submerged and expanded laterally as shown in FIG. In addition, as long as the cylindrical core member 20 can be held at a substantially central position in the thickness direction of the underground wall 10, a cylindrical body that does not close the bottom of the resin bag-like sheet 12 may be used.

  As shown in FIG. 3C, the cylindrical core member 20 is inserted into each bag-like portion in a state where the bag-like sheet 12 is deployed in the underground wall body 10. In this embodiment, the cylindrical core member 20 is a general structural circular steel pipe. The bottom end of the steel pipe is processed into a conical shape, and it is easy to insert the cylindrical core member 20 by spreading the bag-like portion that is in close contact with the side pressure of the uncured soil cement 14. Yes. As the cylindrical core member 20, it is also possible to use a helical tube, a water-resistant void tube, or the like that has a strength that does not deform with respect to the lateral pressure of the uncured soil cement 14.

  FIG. 3D shows a state in which the third cylindrical core member 20 is inserted. The cylindrical core member 20 is inserted into all the bag-shaped portions until the soil cement 14 is cured. Take care. Thereafter, the cylindrical core member 20 is removed. At this time, since the soil cement 14 is hardened, no side pressure acts on the cylindrical core member 20 and the edge of the soil cement 14 and the cylindrical core member 20 is cut by the bag-like sheet 12. The cylindrical core material 20 can be extracted from the soil cement 14 underground wall 10 with a lifting device having a lifting force equivalent to the weight of the cylindrical core material 20. FIG. 3E shows a state in which the last one of the cylindrical core member 20 is removed. Finally, as shown in FIG. 3 (f), the bag-shaped portion from which the cylindrical core material 20 is drawn is arranged in a line along the extending direction of the wall body 10 in which the surrounding soil cement 14 is cured. The formed empty groove 11 is formed. The underground wall 10 in which the continuous air grooves 11 are formed in this way functions as a ground vibration propagation suppressing structure that can effectively block the dense waves propagating through the ground due to the structure of the air grooves 11.

  In addition, although it functions as a ground vibration transmission suppression structure by having the empty groove | channel 11, it is also preferable to fill the low elastic filler 13 in the empty groove | channel 11. FIG. As the low-elasticity filler 13, foamed polystyrene (EPS) beads, synthetic rubber beads, etc., which are formed into substantially small spheres having various dimensions with a diameter of 1 mm to 10 cm can be used. By mixing beads having different diameters at an appropriate ratio at this time, gaps between the beads are closed by beads having a small diameter, so that the packing density of the low elastic filler 13 can be increased. At this time, it is also preferable to use an irregularly shaped polyurethane foam material or polystyrene foam material mixed with a predetermined particle size distribution, instead of the bead-like material. In this case, the self-supporting property is improved due to the interaction (meshing) effect between the members by mixing irregular materials having various dimensions (particle size distribution) in an angular shape. Thereafter, the underground wall 10 can be used as a maintenance-free structure by covering the upper surface of the filler so as to cover the upper surface.

Hereinafter, a second embodiment of the construction method of the underground wall 10 as the ground vibration propagation suppressing structure will be described with reference to each drawing of FIG. FIG.2 (c) is the fragmentary perspective view which showed a part of surface of the underground wall 10 of the ground vibration propagation suppression structure constructed by 2nd Example. In the method of this embodiment, as shown in the drawing, a low elastic filler 13 is densely filled in a cylindrical hollow groove 11 formed independently in the underground wall body 10. Hereinafter, the construction procedure of the ground vibration propagation suppressing structure wall 10 will be described.
FIG. 4A schematically shows a part of the underground wall 10 formed by a known underground wall construction method, cut along a vertical surface on the ground surface, similarly to FIG. 3A. It is ground sectional drawing. In the present embodiment, before the underground wall body 10 is solidified, the resin bag-like sheet 15 containing the cylindrical core member 20 as shown in FIG. It is buried so that the whole is located inside.

  As shown in FIG. 4B, the resin bag-like sheet 15 is a bottomed cylindrical bag-like shape in which the end portion of the sheet having a predetermined height (depth) is heat-sealed so as to form a bag shape. Sheet 15. Each of the resin bag-like sheets 15 is manufactured in an envelope shape in which the width is set so that each cylindrical core member 20 has a circumferential length that can be inserted with a margin. The seat height (depth) is set substantially equal to the wall height (groove depth) of the underground wall 10. Then, as shown in FIGS. 4B and 4C, when a predetermined number of the cylindrical core members 20 are arranged over the entire length of the underground wall body 10, a position holding jig (not shown) is used. It is preferable that the respective intervals are maintained. In the present embodiment, five cylindrical core members 20 are buried in the underground wall body 10, but FIG. 4B shows a state where the fourth cylindrical core member 20 is buried. Yes. As a material for the sheet, a low-density polyethylene-based polyolefin sheet that is a moldable thermoplastic resin and has strength and durability is used as in the first embodiment. Polyolefin sheets are also suitable.

  In the present embodiment, unlike the first embodiment, a ground vibration transmission suppressing structure in which the air groove 11 is filled with the low elastic filler 13 is adopted. With respect to the process of filling the low elastic filler 13, two construction procedures according to the solidified state of the soil cement 14 are assumed.

  In the first procedure, as shown in FIGS. 4 (c-1) and (d-1), the soil cement 14 around the five cylindrical core members 20 buried in the underground wall body 10 is Only the cylindrical core material 20 is pulled out from the resin bag-like sheet 15 in a state of solidifying and reaching the self-supporting strength. At this time, the resin bag-like sheet 15 is integrated with the soil cement 14 and is left in the wall body 10 to form the air groove 11 similar to that shown in the first embodiment. Further, the ground vibration transmission suppressing structure wall 10 is completed by densely filling the low-elasticity fillers 13 into the free-standing air grooves 11. In the case of this construction example, since the soil cement 14 has already reached the self-supporting strength when the air groove 11 is formed, a structure in which the air groove 11 is left as it is as the ground vibration propagation suppressing structure wall body 10 may be used. Needless to say.

  In the second procedure, as shown in FIGS. 4C-2 and 4D-2, the soil cement 14 around the five cylindrical core members 20 buried in the underground wall body 10 is obtained. Before solidifying, only the cylindrical core member 20 is pulled out from the resin bag-like sheet 15. In parallel with this core material drawing operation, the low-elasticity filler 13 is filled into the space in the sheet formed by drawing the cylindrical core material 20. At this time, the low elastic filler 13 is filled at a relatively high density, sufficiently resists the unsolidified soil cement side pressure, and ensures the shape of the empty groove formed by the cylindrical core member 20. When the cylindrical core member 20 is completely pulled out, each empty groove 11 is replaced with the low elastic filler 13, and the ground vibration transmission suppressing structure wall 10 in which the low elastic filler 13 is densely filled is completed.

The explanatory view which showed typically the example of arrangement composition of the vibration propagation suppression structure wall provided by the creation method of the vibration propagation suppression structure of the present invention, and the vibration propagation state. The wall body partial perspective view which showed the structural example of the underground wall body of the vibration propagation suppression structure wall body shown in FIG. The work procedure flowchart which showed the construction procedure of the underground wall body by 1st Example. The work procedure flowchart which showed the construction procedure of the underground wall body by 2nd Example. Explanatory drawing which showed typically the structure of the anti-vibration groove | channel as a conventional vibration propagation suppression structure, and the propagation state of the vibration.

Explanation of symbols

1 Vibration source 3 Ground 10 Vibration propagation restraint member (underground wall)
11 Empty grooves 12 and 15 Resin bag-like sheet 13 Low elastic filler 20 Cylindrical core

Claims (5)

  When the wall is formed by filling the solidified material in the continuous groove excavated in a predetermined range of the ground between the vibration generation source and the affected facility, the solidified material is in an unsolidified state, A bag-like sheet capable of accommodating a cylindrical core material in an individual bag-like portion is provided in a planar shape in the extending direction of the continuous groove, and the cylindrical core material is accommodated in each bag-like portion, and the solidified material has a self-supporting strength The cylindrical core material is pulled out from the bag-like portion, and a plurality of cylindrical gaps are arranged in the wall body in the extending direction of the wall body. .   When the wall is formed by filling the solidified material in the continuous groove excavated in a predetermined range of the ground between the vibration generation source and the affected facility, the solidified material is in an unsolidified state, A bag-like sheet containing a cylindrical core material is lined up in the direction of extension of the continuous groove and submerged, and after the solidified material has reached a self-supporting strength, the cylindrical core material is pulled out from the bag-like portion, and into the wall body. A construction method of a ground vibration propagation suppressing structure, wherein a plurality of cylindrical gaps are arranged in an extending direction of a wall body.   When the wall is formed by filling the solidified material in the continuous groove excavated in a predetermined range of the ground between the vibration generation source and the affected facility, the solidified material is in an unsolidified state, Substituting and filling a low-elasticity filler into the void generated when the cylindrical core material is pulled out from the bag-like sheet by burying the bag-shaped sheet containing the cylindrical core material in the extending direction of the continuous groove, A method for constructing a structure for suppressing ground vibration propagation, characterized in that a plurality of cylindrical low-elastic fillers are arranged in the wall in the extending direction of the wall.   2. The ground vibration according to claim 1, wherein the bag-like sheet is submerged in the solidified material of the continuous groove in a wound state, and is expanded in the solidified material along the extending direction of the continuous groove. Propagation suppression structure creation method.   The method for creating a ground vibration propagation suppressing structure according to claim 1 or 2, wherein the cylindrical gap is filled with a low elastic filler.

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