JP6024977B2 - Ground vibration propagation suppressing structure and construction method thereof - Google Patents

Description

  The present invention relates to a structure for suppressing ground vibration propagation and a construction method thereof, and in particular, effectively reduces vibration propagating through a ground from a vibration generating source such as a pile driving machine used in construction work, The present invention relates to a structure for suppressing propagation of ground vibration that suppresses adverse effects on existing facilities such as neighboring houses and eliminates the need to remove the structure after the construction work is completed, and a construction method thereof.

  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 applicant has so far formed it in the ground that partitions between the vibration source and the receiving facility such as a house. Various ground vibration propagation suppression structures having hollow grooves (hereinafter referred to as empty grooves) have been proposed.

  For example, a groove-like wall body is created in the ground, a casing is embedded in the wall body, a bag-shaped body of a predetermined shape is sunk and held therein, and pressurized gas is sealed to form an empty groove Structures (Patent Document 1) constructed with hollow walls and grooves are formed, and a plurality of bag-like bodies corresponding to a plurality of vertically extending grooves supported by holding members are arranged in the grooves. The solidified material is filled in the groove around the bag-shaped body, and the fluid is supplied to the bag-shaped body and expanded before the filler is cured. The construction method (patent document 2) etc. which constructed | assembled the predetermined continuous hollow wall body is proposed, and the patent is acquired.

Japanese Patent No. 4868365 Japanese Patent No. 4915580

  By the way, the above-mentioned ground vibration propagation suppression walls are intended to prevent the influence of permanent vibration from the stationary vibration sources. Therefore, in order to construct for the purpose of reducing the vibration from various construction machines that occurs during the construction period, there is a problem that the size of the structural wall body is large and the construction cost is also increased. Therefore, there is a demand for effective propagation suppression of vibrations that can be performed quickly prior to construction work and that are generated in construction work that is continued.

  In addition, it is necessary to remove the ground vibration propagation suppression wall that has played the role of vibration suppression as a temporary structure during the construction period, after the completion of the construction. However, there is a problem that, when construction works for a long period of time, due to earth pressure acting on the ground vibration propagation suppression wall in the ground, the frictional resistance at the time of pulling out the wall body increases, making it difficult to remove from the ground.

  Considering the above background, various configurations and effects of air gaps made of temporary structures have been confirmed. As long as air gaps can be obtained, a thin wall-like space with a depth of at least about 3 m and a thickness of at least about 3 cm can be secured. It was confirmed that a vibration power level reduction effect of about 8 dB was obtained with respect to the vibration frequency range generated by construction machinery and the like. Accordingly, an object of the present invention is to embed a hollow wall body having a hollow portion corresponding to an air groove to such a depth so as to reliably prevent propagation of dense waves from a vibration source in the ground. An object of the present invention is to provide a ground vibration propagation suppressing structure in which a wall is not required to be removed after construction work is completed, and a construction method thereof.

  In order to achieve the above object, the ground vibration propagation suppressing structure of the present invention is a slurry in which the in-situ soil formed in a predetermined range of the ground between the vibration generation source and the affected facility is stirred. In the filled groove, the same shape unit wall body of the hollow structure which consists of a biodegradable raw material was arranged side by side, and it was set as the continuous hollow wall body.

  It is preferable that each surface of the unit wall is constituted by a panel formed by molding a biodegradable chemically synthesized polymer. Thereby, the removal operation | work of the said hollow wall body can be eliminated.

  It is preferable that the unit wall body has an internal hollow portion of at least 30 mm in the thickness direction.

  It is preferable that the unit wall body secures a wall height to be embedded at least 3 m.

  As an invention of the construction method of the ground vibration propagation suppressing structure described above, a groove filled with slurry in which the soil in the original position is agitated is formed in a predetermined range of the ground between the vibration generation source and the affected facility. In the groove, the same shape unit wall body having a hollow structure made of a biodegradable material is buried in such a manner that side end surfaces are sequentially joined together to construct a continuous hollow wall body.

  According to the present invention, in construction work, a vibration generating source is designed to absorb propagation vibration energy by arranging a hollow wall body made of a biodegradable material between a vibration generating source and a facility affected by the vibration generating source. Since it is not necessary to remove the hollow wall body after the construction work, the construction cost can be reduced.

The explanatory perspective view showing typically the example of arrangement composition of one embodiment of the vibration propagation control structure of the present invention, and the vibration propagation state. FIG. 2 is a schematic plan view and a schematic cross-sectional view schematically showing the vibration propagation state shown in FIG. 1. The perspective view which showed the external appearance shape of the unit wall body of the hollow wall body of one Embodiment in the vibration propagation suppression structure of this invention. The top view which showed the planar shape of the unit wall body of the wall body in one Embodiment of this invention, a hollow part shape, and the example of a wall body connection. The top view which showed the planar shape of the unit wall body of the wall body in one Embodiment of this invention, a hollow part shape, and the example of a wall body connection. The work flow figure which showed the installation construction procedure of the unit wall body of the hollow wall body in a vibration propagation suppression structure. The top view which showed the example of a wall body connection using the deformed unit wall body of a hollow wall body.

  Hereinafter, as the best mode for carrying out the ground vibration propagation suppressing structure and its construction 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 an example of embedding in a ground of an embodiment of a hollow wall body as a ground vibration propagation suppressing structure of the present invention. 2 is a schematic plan view and a cross-sectional view based on FIG. As shown in each drawing, for example, a vibration suppression structure for ground vibration over a predetermined width between a vibration source S of a construction machine 1 such as a pile driving machine and an adjacent building 60 in the vicinity thereof. A hollow wall 11 as 10 is embedded. In the figure, the propagation state of the vibration from the vibration generating source S in the ground 3 is schematically shown as a concentric circle (hemisphere). Thus, the generated vibration propagates through the surface of the ground 3 and the ground. And the vibration is suppressed and reduced by being absorbed to some extent by the hollow wall body 11 as the ground vibration propagation suppressing structure 10 positioned between the adjacent buildings 60. Thereby, the influence of the vibration to the adjacent building 60 located outside the hollow wall body 11 can be minimized.

  In this embodiment, the vibration source S and the adjacent building 60 are separated from each other by about 5 to 10 m, and the embedded range of the hollow wall body 11 takes into consideration the relationship with the adjacent building 60 and the distance from the vibration source S. Is preferably set. 2 (a) and 2 (b), a continuous wall-like hollow wall body 11 is constructed as a ground vibration propagation suppressing structure having a wall body height (depth) of about 3 m and a wall body thickness of 50 mm. The size (extension (width), wall thickness, wall length (depth)) of the hollow wall 11 is the vibration level of the vibration generated from the construction machine used at each construction site, the vibration source S and the adjacent building 60. It is preferable to determine in consideration of the arrangement relationship with the ground, the ground characteristics of the ground 3 through which vibration propagates, and the like.

  Hereinafter, the hollow wall body 11 as the ground vibration propagation suppressing structure and the unit wall body 12 constituting the wall body will be described with reference to FIGS. 3 to 5A and 5B.

  As shown in FIG. 1, the hollow wall body 11 as the ground vibration propagation suppressing structure of the present invention has a configuration in which a hollow unit wall body 12 (FIG. 3) is linearly connected in the extending direction in the ground 3. Consists of. Hereinafter, the configuration of the hollow unit wall 12 will be described with reference to the drawings. As shown in FIG. 3, the unit wall 12 is composed of a vertically long plate-like member having a predetermined wall height. The dimensions of the unit wall body 12 in the present embodiment are a width of 1.0 m, a height of 3.0 m, and a thickness of 50 mm. As shown in the figure, along the longitudinal direction of the side end face 14 corresponding to the long side, the concave portion 14a and the convex A portion 14b is formed. The concave portions 14 a and the convex portions 14 b function as “mortises” and serve as connection portions when the unit wall body 12 is assembled to become the hollow wall body 11. As will be described later, the concave portion 14a and the convex portion 14b as the tenon are aligned with the concave portion 14a or the convex portion 14b of the unit wall body 12 already embedded in the ground at the embedded position of the unit wall body 12. Therefore, it is formed with a precision that can be fitted. In addition, it is preferable that the height of the unit wall body 12 is embedded to a depth of at least 3 m from the ground surface in order to exhibit a vibration propagation suppressing effect. The width is preferably in the range of about 1.0 to 1.5 m for convenience of transportation and burial work.

  As shown in FIG. 4B, the unit wall 12 is formed of a hollow structure plate having an outer peripheral surface surrounded by a panel 13 and having a hollow portion formed therein. In this embodiment, the panel thickness is set to about 10 mm, and the thickness direction dimension of the hollow portion 17 is set to about 30 mm. Therefore, the wall thickness (plate thickness) of the unit wall 12 is 50 mm. The hollow portion 17 preferably has at least 30 mm in order to exhibit a vibration propagation suppressing effect. Moreover, it is preferable to set it as the range of 30-50 mm in consideration of the intensity | strength and rigidity as the unit wall 12.

  The panel 13 constituting the unit wall 12 is formed of a biodegradable plastic molding plate called “green plastic”. In this embodiment, an aliphatic polyester-based polycaprolactone molded plate is used as a chemically synthesized polymer. As a biodegradable material used here, it is necessary to be able to ensure the moldability and mechanical properties (strength, elastic modulus) that can be molded as the wall panel 13 having a predetermined area. Furthermore, it is preferable to have easy degradability that can be biodegraded in 2 to 3 years after being buried underground. As applicable similar materials, polybutylene succinate, polyethylene succinate, polyglycolic acid, polylactic acid and the like can be selectively used. Moreover, polyvinyl alcohol, a polyurethane, and a nylon oligomer can also be used as another biodegradable material. In addition, microbial polysaccharide materials such as microbial biopolyester, bacterial cellulose, pullulan, and curdlan, and polyamino acids can be selected as long as they have moldability and mechanical properties as a panel. Furthermore, it is also preferable to use blends or laminate products with chemically synthesized green plastics based on natural product green plastics (chitosan / cellulose, starch) in order to improve molding processability and mechanical properties.

  In this embodiment, the panel 13 corresponding to the wall surface of the unit wall body 12 made of a biodegradable plastic molded plate is a rectangle having a width of 1 m and a height of 3 m as an example satisfying the above conditions. The panel 13 is assembled as a unit wall body 12 constituting a wall surface. As will be described later, the unit wall body 12 is cut by an excavating machine and embedded in a predetermined position in the ground in a slurry state to become a hollow wall body 11. After embedding, the unit wall body 12 receives a lateral pressure (earth pressure) from the ground around the wall body. The panel material is selected and the plate thickness is set so that the panel 13 has bending strength and bending rigidity that do not deform against the applied earth pressure. It is also preferable that a predetermined rib is integrally formed with the panel 13 on the hollow portion 17 side as necessary.

  In order to manufacture the unit wall 12, a resin molding process using a core that forms the hollow portion 17 and a mold that can form the entire outer shape, or two wall panels 13, and the thickness of the wall It is possible to assemble a box-shaped body by surrounding the wall panel 13 as a directional member and adhering to a belt-like plate as an outer peripheral surface. Moreover, the well-known method of manufacturing another resin product is employable.

  FIG. 4C is a schematic diagram showing an example in which the unit wall bodies 12 are connected in a wall shape. As shown in the figure, the hollow wall body 11 is connected by fitting the concave portion 14a and the convex portion 14b at opposite positions as "mortises" in the ground to form an integral hollow wall body 11. .

  5A to 5C are a plan view, a cross-sectional view, and an explanatory view showing a connection state showing a modification of the hollow wall 11 of the unit wall 12. Unlike the respective drawings in FIG. 4, the hollow wall body 11 is formed of a thin rectangular parallelepiped that does not have a concave or convex portion as a “mortise” on the side end surface 14. Instead, the joint member 20 is used to connect the unit wall 12. The joint member 20 is an embossing member made of the same biodegradable plastic as that of the unit wall body 12. The cross-sectional shape is H-shaped, and the height of the web 20 a is a dimension that can hold the unit wall body 12 to be connected. It is. Moreover, it has the flange 20b of a short dimension which ensures the linearity of the unit wall body 12 connected adjacently. As shown in FIG. 5A, the joint member 20 is fixed to one side end surface 14 of the unit wall body 12 with a bolt or the like (not shown), so that a concave portion 14 a ( It has the same function as that shown in FIG. 4 (a), and can facilitate connection work at the time of burial on site. FIG. 5C is a schematic diagram illustrating an example in which the unit wall bodies 12 are connected using the joint member 20. As shown in the figure, adjacent unit wall bodies 12 are connected in a straight line in the ground using the flange 20b of the joint member 20 as a guide, and an integrated hollow wall body 11 is constructed.

  Hereinafter, the construction procedure for embedding the unit wall body 12 in the target ground 3 and constructing the hollow wall body 11 in the ground will be described with reference to FIGS. FIGS. 6A to 6D show an operation of burying the unit wall body 12 in the target ground 3, excavating the groove-shaped ground region 5, and a step of burying the unit wall body 12 in the groove-shaped ground region 5. It is the construction sequence diagram which showed the process to the completion state of the hollow wall body 11 as a repeating operation | work of this and ground vibration propagation suppression structure.

  First, as shown to Fig.6 (a), the unit wall body 12 is continuously embed | buried in the shape of a wall surface, and the work (ground area | region 5) which builds the hollow wall body 11 is dug back. For this ground excavation work, it is preferable to use a dedicated ground improvement machine used in the power blender method. In general, the power blender method injects a slurry-like improvement material such as a kneaded cement / cement-based solidified material into a ground region having a predetermined width and depth cut by a trencher, The purpose is to stir and mix the improved materials to create a solidified ground. On the other hand, in the present invention, ground cutting with a trencher is performed in the same manner as the power blender method, but the ground improvement of the target ground region 5 is not aimed. For this reason, what is necessary is just to set the addition amount of a solidification material so that the ground area | region 5 which embed | buried the hollow wall body 11 after solidification may recover | restore to the intensity | strength grade of an original ground.

  In actual construction, as shown in FIG. 6A, the trencher blade and the stirring blade are operated while moving the base machine (not shown) on which the trencher is mounted along the construction range of the hollow wall body 11. While being finely cut, it is kneaded with the charged solidified material to make the elongated groove-like ground region 5 into a slurry. That is, by making the target ground into a slurry state, the unit wall body 12 as a subsequent process can be easily embedded at a predetermined position in the ground 3. In this embodiment, the ground region 5 is set to a cutting width of about 600 mm. This dimension can be appropriately set by selecting the dimensions of the blade and the stirring blade installed in the trencher.

  After the slender groove-shaped ground region 5 is applied in a slurry state, the unit wall is shown in FIG. 6 (b) with only a tip attachment 30 and a base machine having a boom arm that can freely operate the tip attachment 30 from the cockpit. The body 12 is buried. At this time, since the ground region 5 in which the unit wall body 12 is embedded is in an unsolidified slurry, the unit wall body 12 held by the tip attachment 30 is shown in the figure by an operation in the cockpit of the base machine. It can be easily embedded at a predetermined position in the ground from the state.

  Subsequently, as shown in FIG. 6C, the burying operation is continuously performed while the side end surface 14 of the next unit wall body 12 is aligned with the side end surface 14 of the already embedded unit wall body 12. At this time, the two unit wall bodies 12, 12 are connected in a straight line by a connection structure (for example, a “tenon structure of the concave portion 14 a and the convex portion 14 b, the joint member 20) provided on the side end surface 14. Embed while checking the position.

  FIG. 6D is a schematic perspective view showing a state in which the hollow wall body 11 is constructed by connecting and embedding four (one example in the figure) unit wall bodies 12 in the elongated groove-shaped ground region 5. It is. After constructing the hollow wall 11, the groove-like ground region 5 recovers to the same strength as the surrounding ground 3. In this state, the hollow wall 11 constructed in the ground 3 propagates the vibration generated from the vibration source S (FIG. 1) of the construction machine 1 through the ground 3 as shown in FIGS. In this case, propagation is blocked or reduced by the hollow portion 17 in the hollow wall body 11.

FIG. 7 is a schematic plan view showing a modification of the end structure of the hollow wall body 11 as the ground vibration propagation suppressing structure of the present invention. FIG. 7A shows an example in which an end wall body 18 having a predetermined folding angle α on the vibration generation source S side is connected to the end of the hollow wall body 11. According to the end wall 18, it is possible to reduce the degree of vibration diffracting at the end of the wall and wrapping around the building as compared with the end of the normal linear wall. For this reason, when there is a building close to the back of the hollow wall body 11, the propagation of vibrations through the ground can be effectively reduced. The folding angle α of the end wall 18 is set to a range of about α <150 ° above the folding angle α ₀ (which varies depending on the position of the vibration source) so that the wall faces the vibration source S. The vibration diffraction direction at the end of the hollow wall 11 is kept away from the building side, and the effect of reducing vibration propagation is obtained.

  FIG. 7B shows a case where the hollow wall body 11 is continuously embedded around the vibration source. In this example, a corner member 19A that changes the installation direction of the unit wall 12 of the hollow wall 11 is used. Also in this example, the corner member 19A is a hollow member using a biodegradable material. As shown in the drawing, the corner member has a right angle (90 °), but as shown in FIG. 7C, the corner member 19B having an arbitrary angle is used as the unit wall 12. It is also possible to make the embedded range of any polygonal shape surrounding the vibration source S.

  In addition, this invention is not limited to the Example mentioned above, A various change within the range shown to each claim is possible. In other words, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Construction machine 3 Ground 5 Groove-shaped ground area 10 Ground vibration propagation suppression structure 11 Hollow wall body 12 Unit wall body 13 Panel (wall panel)
14 Side end surface 20 Joint member 60 Adjacent building S Vibration generation source

Claims (5)

  An isomorphous hollow structure made of biodegradable material is placed in a groove that is created in a predetermined area of the ground between the vibration source and the affected facility, and in which the soil is stirred and filled with slurry. A ground vibration propagation suppressing structure characterized in that unit wall bodies are embedded side by side to form a continuous hollow wall body.   The ground vibration propagation suppressing structure according to claim 1, wherein each surface of the unit wall body is constituted by a panel formed by molding a biodegradable chemically synthesized polymer.   The ground vibration propagation suppressing structure according to claim 1, wherein the unit wall body has a hollow portion secured at least 30 mm in the thickness direction.   The ground vibration propagation suppressing structure according to claim 1, wherein the unit wall body has a wall height of at least 3 m.   A groove filled with slurry in which the in-situ soil is agitated is formed in a predetermined range of the ground between the vibration generation source and the affected facility, and a hollow made of a biodegradable material is formed in the groove. A method for constructing a ground vibration propagation suppressing structure, characterized in that unit wall bodies having the same shape are embedded by sequentially joining side end faces to construct a continuous hollow wall body.

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