JP2016156183A - Vibration isolation separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolation separator allowing for favorable construction of a concrete wall that prevents transmission of vibration from an underground wall side that is an earth retaining wall side to a formwork side.SOLUTION: The vibration isolation separator is provided that maintains a distance between a buffer layer 32 installed as an accessory element in an underground wall 30 and a formwork 40. The separator has a first plate-like part 111 and a second plate-like part 112, which are separated from each other in a separation direction of the buffer layer 32 and the formwork 40 and face to each other. An end 48b of a formwork side bolt 48 is fixed to the second plate-like part 112. An elastic body 130 is disposed between the first plate-like part 111 and the second plate-like part 112. The elastic body 130 is fixed to an end 35a of an underground wall side bolt 35 inserted in a hole part 111a formed on the first plate-like part 111 and engages with the first plate-like part 111. The elastic body 130 deforms following an outer shape of the elastic body 130 between the first plate-like part 111 and the second plate-like part 112 and is covered with a protection cap part 140 that is tightly attached to an outer circumferential surface 1341.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an anti-vibration separator used when a concrete wall is constructed along an underground wall such as a retaining wall.

  In the construction of underground structures, in order to block vibration from railways and main roads, an anti-vibration mat serving as a buffer layer is placed on the underground wall such as a retaining wall, and this anti-vibration mat and mold A method of constructing a concrete wall by placing concrete between the frame is known. When constructing a concrete wall, a separator is used that is interposed between the buffer layer and the mold and maintains the space between the underground wall and the mold. In this method, vibration from the underground continuous wall side to the concrete wall is absorbed by the anti-vibration mat, but one end of the separator is fixed to the steel material embedded in the underground wall, and the other end is fixed to the formwork. If the anti-vibration mat is installed, the vibration of the underground wall is transmitted from the steel material to the separator and is diffused from the separator to the concrete wall to generate vibration of the structure and vibration sound from the concrete wall. In order to prevent such vibration transmission from the underground continuous wall, an anti-vibration separator has been proposed (see Patent Documents 1 to 3).

  In Patent Document 1, as shown in FIG. 1, when a concrete slab 5 ′ is placed on a mountain retaining wall 1 or the like of an underground structure with anti-vibration rubber mats 2 and 3 interposed, A separator 6 is disclosed which is used by being connected to the mold 4 of the slab 5 ′. This separator 6 prevents the vibration transmitted from the mountain retaining wall to the concrete slab 5 ′ by making the elastic body 9 a part located in the anti-vibration rubber mats 2 and 3. The anti-vibration rubber mat 3 and the concrete slab 5 'are partitioned by a washer 7 through which the separator 6 is inserted.

  In Patent Document 2, a rectangular plate fixed to the H steel material of the mountain stop wall between the mountain stop wall and the mold frame, and the other end portion of the rod body having one end connected to the mold frame have a long nut. A configuration is disclosed in which a separator to which a vibration-proof rubber is bonded is provided between a circular plate and a disk that is fixed via a disc.

  In Patent Document 3, a steel material and an anti-vibration plate are attached to the retaining wall, and a first end plate fixed to the steel material is provided between the mold frame and the form frame that is spaced apart from the anti-vibration plate. A separator having a second end plate secured to a male thread connector is disclosed. The separator has a separator body in which a first end plate and a second end plate are attached in parallel through corner bolts and high nuts, and a central portion of the first end plate and a central portion of the second end plate In between, an elastic body which is a vibration-proof protruding cylindrical body is provided inside the corner bolt. Thereby, the retaining wall side and the formwork side are connected via an elastic body, and vibration from the retaining wall to the formwork side is prevented.

Japanese Patent No. 3275251 Japanese Patent No. 3160692 Japanese Patent No. 5208596

  However, the conventional separator configuration has the following problems.

  In Patent Document 1, the elastic body 9 is designed to withstand a tensile pressure (about 600 kg) that pushes and spreads the mold 4 by the concrete slab 5 '. However, when a tensile force more than expected is generated, the elastic body 9 is not able to endure due to the configuration, and a gap is generated between the anti-vibration rubber mat 3 and the washer 7, and the concrete slab 5 ′ may flow in. There is.

  In the configuration of Patent Document 2, when the concrete is placed between the mountain wall and the formwork, the placed concrete adheres from the circular plate to the rectangular plate. Therefore, when the concrete hardens and becomes a rigid body, The vibration on the wall side may propagate from the rectangular plate fixed to the H steel material which becomes the bone of the mountain top wall to the circular plate and the rod body through the concrete, and there is a risk that the vibration and sound waves may enter the structure.

  In Patent Document 3, as in Patent Document 2, the earth retaining wall side and the mold frame side are connected via an elastic body, but a corner bolt, a vibration-proof projecting cylindrical body is provided between the vibration isolation plate and the mold frame. The elastic body is exposed and arranged. As a result, when concrete is placed, the first end plate, the second end plate, the corner bolt, and the high nut become rigid due to the concrete, and vibration may propagate from the retaining wall side to the concrete wall side.

  The present invention has been made in view of such points, and an object thereof is to provide a vibration-proof separator capable of suitably constructing a concrete wall that prevents transmission of vibration from the underground wall side, which is a retaining wall, to the formwork side. And

  One aspect of the vibration-proof separator of the present invention is that a steel material and a buffer layer are attached to the underground wall, a mold frame is set apart from the buffer layer, and a concrete is provided between the buffer layer and the mold frame. A projecting side end portion of the underground wall side rod-shaped body that is fixed to the steel material and penetrates the buffer layer and projects to the mold frame side, and a mold frame that projects from the mold frame An anti-vibration separator that keeps a space between the buffer layer and the formwork by separating an end of the side bar-like body on the side of the underground wall side rod-like body, and is a first that contacts the buffer layer A plate-like portion, a second plate-like portion that is spaced apart from the first plate-like portion on the mold side, and the first plate-like portion and the second plate-like portion are integrated. A main body frame portion having a connecting member; a mold frame side fixing member that fixes an end of the mold frame side bar to the second plate portion; the first plate portion and the first plate portion; An elastically deformable cylindrical elastic body that is disposed between the plate-like parts and engages with a hole formed in the first plate-like part, and the underground wall-side rod-like body The protruding side end portion protrudes through the through hole of the cylindrical elastic body, and is fixed to the end surface of the cylindrical elastic body on the mold side by an elastic body side fixing member, and the cylindrical elastic body is The cylindrical cap is deformed following the outer shape of the cylindrical elastic body and is covered with a protective cap portion that is in close contact with the outer peripheral surface of the cylindrical elastic body. The protective cap portion is in contact with the first plate-shaped portion. Adopt the configuration.

  ADVANTAGE OF THE INVENTION According to this invention, the concrete wall which prevented the transmission of the vibration from the underground wall side which is a retaining wall to the formwork side can be constructed suitably.

The figure which shows an example of the conventional separator The figure which shows the structure of the formwork apparatus using the vibration isolator which concerns on one embodiment of this invention Enlarged view of part X in FIG. Enlarged view of underground wall side bolt shown in FIG. The side view of the vibration isolator which concerns on one embodiment of this invention Front view of the anti-vibration separator Rear view of the anti-vibration separator The figure which uses for description of the modification 1 of the vibration isolator which concerns on embodiment of this invention The figure which serves for explanation of the modification of the elastic body

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

<Outline of formwork equipment using anti-vibration separator>
FIG. 2 is a diagram showing a configuration of the mold apparatus 20 using the vibration-proof separator 100 according to the embodiment of the present invention. 3 is an enlarged view of a portion X in FIG. 2, and FIG. 4 is an enlarged view of the underground wall side bolt shown in FIG.

  As shown in FIG. 2, the anti-vibration separator 100 according to the present embodiment constructs a concrete wall as an anti-vibration underground wall of a structure along an underground wall 30 formed by excavating a natural ground. Used in the formwork apparatus 20.

  The underground wall 30 is a retaining wall portion formed by excavating a natural ground, and a plurality of underground steel frames (steel materials) 31 serving as a core material are embedded at predetermined intervals. A plate-like buffer layer 32 is attached so as to cover the underground steel frame 31. Here, the buffer layer 32 has a function as an anti-vibration material that reduces vibration transmitted from the natural ground side, and here, by laminating plate-like buffer materials 32a and 32b made of foam, rubber, or the like. It is configured. For example, an anti-vibration rubber mat may be used as the buffer layer 32.

  The underground steel frame 31 is composed of an H-shaped steel or the like. As shown in FIG. 3, the underground wall side bolt 35, which is an underground wall side rod-like body, penetrates the buffer layer 32. Thus, the buffer layer 32 is fixed so as to protrude from the wall surface.

  Specifically, as shown in FIG. 4, the underground wall side bolt 35 is fixed to the underground steel frame 31 by a fastening member 33 such as a weld or stud. The underground wall side bolt 35 has a length that penetrates the buffer layer 32 and projects from 1/3 to about the middle of the main body frame portion 110 of the anti-vibration separator 100. In addition, an elastic body (cylindrical elastic body) 130 that functions as a vibration absorber in the anti-vibration separator 100 is inserted and fixed from the end portion 35a of the underground wall side bolt 35 protruding from the buffer layer 32.

  As shown in FIG. 2, the formwork 40 is arranged in parallel with the separation distance R therebetween so as to face the underground wall 30 (specifically, the buffer layer 32) through the anti-vibration separator 100. .

  The mold 40 is made of a veneer plate or the like and is disposed to face the buffer layer 32. A support 45 for supporting the mold 40 is attached to the outside of the mold 40. The support work 45 has a lateral end thick material 42, a vertical material 43, and the like.

  The separation distance R between the mold 40 and the buffer layer 32 is a length corresponding to the thickness of the concrete wall 50 to be constructed. In other words, concrete is placed between the buffer layer 32 that follows the underground wall 30 and the mold 40, and after the mold is cured, the concrete placement portion becomes a concrete wall. In the present embodiment, since a reinforcing bar (not shown) is arranged between the buffer layer 32 and the mold 40, a reinforced concrete wall is constructed by placing concrete in this space.

  In addition, the support 45 is fixed to one end 48a of a mold-side bolt (form-frame-side rod-shaped body) 48 extending from the mold 40 to the underground wall side via a metal fitting 46, a nut 47, and the like. Yes.

  Between the buffer layer 32 and the mold 40, an end 35a (see FIG. 4) of the underground wall side bolt 35 and the other end 48b of the mold side bolt 48 are connected, and the underground An anti-vibration separator 100 that holds a state where the wall 30 (buffer layer 32) and the formwork 40 are spaced apart from each other is interposed.

<Configuration of anti-vibration separator>
FIG. 5 is a side view of the vibration proof separator according to the embodiment of the present invention, FIG. 6 is a front view of the vibration proof separator, and FIG. 7 is a rear view of the vibration proof separator.

  The anti-vibration separator 100 has a steel wall (underground steel frame 31) and a buffer layer 32 attached to the underground wall, and a mold frame 40 is set apart from the buffer layer 32, and between the buffer layer 32 and the mold frame 40 The end of the underground wall side bolt (underground wall side rod-like body) 35 that is fixed to the steel material (underground steel frame 31) and protrudes through the buffer layer 32 and protrudes toward the mold 40 when the concrete is placed on the wall Part (protruding side end) 35a and the other end (end of the underground wall side bolt (ground wall side rod-shaped body) side of the mold side bolt (mold frame side rod-shaped body) projecting from the mold 40 Part) 48b is separated and the space | interval of the buffer layer 32 and the formwork 40 is hold | maintained.

  The anti-vibration separator 100 includes a main body frame part 110, an elastic body 130, a protective cap part 140, and an elastic body side fixing member 150.

  The main body frame portion 110 includes a first plate-like portion 111 that is in contact with the buffer layer 32, a second plate-like portion 112 that is spaced from the first plate-like portion 111 toward the mold 40, and The first plate-like portion 111 and the second plate-like portion 112 are each provided with a support side portion (connecting member) 116 that is integrated in a separated state. The 2nd plate-shaped part 112 is arrange | positioned so that the surface facing the formwork 40 may become parallel.

  Here, the 1st plate-shaped part 111 and the 2nd plate-shaped part 112 mutually oppose, and the hole parts 111a and 112a are formed in each. Here, the respective holes 111a and 112a are arranged at the same center with different diameters, and are formed at the central portions of the first plate-like portion 111 and the second plate-like portion 112, respectively.

  The main body frame portion 110 is formed by bending a metal plate material, for example, so that the first plate portion 111 and the second plate portion 112 that face each other, and the first plate portion 111 and the second plate portion 112 are arranged. It is formed in a rectangular frame shape having a pair of plate-like support side portions 116, 116 that are provided so as to be orthogonal to both sides and are opposed to each other. The support side portion 116 integrates the first plate-like portion 111 and the second plate-like portion 112. Further, the support side portion 116 is connected to both the first plate-like portion 111 and the second plate-like portion 112 so as to be orthogonal to each other, and is configured by a pair of plate-like members (connection members) facing each other. Thereby, the support side part 116 can connect the 1st plate-shaped part 111 and the 2nd plate-shaped part 112 firmly.

  At least a pair of side surfaces of the main body frame portion 110 are open, and the internal space between the second plate-like portion 112 and the first plate-like portion 111 communicates with the outside. Here, the main body frame portion 110 opens at an edge surrounded by the second plate-like portion 112, the first plate-like portion 111, and the support side portions 116 and 116.

  The second plate-like portion 112 is disposed so as to be separated from the first plate-like portion 111 on the mold 40 side. In the second plate-like portion 112, the other end 48b of the mold-side bolt 48 is fixed to the hole 112a via a nut 61. The nut 61 corresponds to a formwork side fixing member. The size of the hole 112a of the second plate-like portion 112 is, for example, a hole diameter that is about 1 mm larger than the outer diameter of the mold-side bolt 48, and is a surface (second plate) facing the mold 40 of the second plate-like portion 112. The mold side bolts 48 are inserted from the outer surface of the shaped portion 112 and protrude to the opposite surface (the inner surface of the second plate-like portion 112). The main body frame part 110 is fixed to the mold side bolt 48 by screwing a nut 61 into the protruding portion (the other end 48b of the mold side bolt 48).

  The small-diameter cylindrical portion 132 of the elastic body 130 in which the end portion 35 a of the underground wall side bolt 35 protrudes through the through hole 135 is engaged with the hole portion 111 a of the first plate-like portion 111. That is, the underground wall side bolt 35 protruding from the buffer layer (see FIG. 1) 32 is inserted into the hole portion 111 a of the first plate-like portion 111 together with the small diameter cylindrical portion 132. Further, the hole 111a of the first plate-like portion 111 is formed slightly larger (about 1 mm) than the outer diameter of the small-diameter cylindrical portion 132 of the elastic body 130, and the large-diameter cylindrical portion 134 in the main body frame portion 110 is formed. The shape does not pass.

  A part of the small-diameter cylindrical part 132 protruding from the first plate-like part 111 to the outside of the main body frame part 110 may be accommodated in the concave part 36 of the buffer layer 32 that follows the underground wall 30 as shown in FIG. . In addition, this recessed part 36 is formed by pushing the small diameter cylindrical part 132 into the buffer layer 32 when the buffer layer product 36 is a foam, and is not formed in the buffer layer 36 in advance. The buffer layer 32 may be formed in advance when the anti-vibration rubber mat or the like is formed.

  The elastic body 130 can be elastically deformed, and has an anti-vibration transmission and a buffer function by being elastically deformed. Here, a vibration-proof rubber is applied as the elastic body 130.

  The elastic body 130 has a cylindrical shape with a T-shaped cross section in which a small diameter cylindrical portion 132 and a large diameter cylindrical portion 134 are connected in the axial direction. The large diameter cylindrical portion 134 includes the second plate-shaped portion 112 and the first plate. It arrange | positions between the plate-shaped parts 111, ie, the main body frame part 110. FIG. Since the small-diameter cylindrical portion 132 is fitted into and protrudes from the hole 111a, the elastic body 130 is a first plate-like portion at the step portion between the small-diameter cylindrical portion 132 and the large-diameter cylindrical portion 134 in the main body frame portion 110. It engages with the inner surface 111b and the hole 111a of the portion 111. As described above, the elastic body 130 is disposed between the first plate-like portion 111 and the second plate-like portion 112 and engages with the hole 111 a formed in the first plate-like portion 111.

  In the frame part 110, the surface (contact surface with the first plate-like part 111) 134 a on the small-diameter cylindrical part 132 side of the large-diameter cylindrical part 134 and the inner surface 111 b of the first plate-like part 111 are in surface contact. Engage.

  The elastic body 130 has a through-hole 135 that penetrates the small-diameter cylindrical portion 132 and the large-diameter cylindrical portion 134 at the center, and the underground wall side bolt 35 is inserted into the through-hole 135. The end portion 35 a of the underground wall side bolt 35 protrudes on the large-diameter cylindrical portion 134 side that is the mold frame 40 side, and the protruding portion is fixed via the elastic body side fixing member 150. That is, the end portion (projecting side end portion) 35a of the underground wall side bolt 35 (inner wall side rod-like body) protrudes through the through hole 135 of the elastic body 130, and the elastic body 130 side of the mold 40 The elastic body side fixing member 150 is fixed to the end face.

  Here, the elastic body side fixing member 150 includes a nut 152 that is screwed into a male screw portion formed on the end portion 35 a of the underground wall side bolt 35, a large washer 154, and a small washer 156. Specifically, the nut 152 is screwed into the end portion 35 a of the underground wall side bolt 35 via the large washer 154 and the small washer 156.

  The elastic body 130 shall be designed so that the vibration isolation effect can be obtained from a low frequency range (30 Hz to 40 Hz). In order to obtain a vibration blocking effect, the hardness of the elastic body 130, that is, the hardness of the anti-vibration rubber as the elastic body 130 is preferably as soft as possible. However, if the hardness is too soft, the amount of rubber deformation increases. The elastic body 130 of the anti-vibration separator 100 is required to prevent the large-diameter cylindrical portion 134 of the elastic body 130 from being crushed even when a compressive force of 800 kgf is applied. Further, downsizing of the vibration-proof separator is required from the viewpoint of weight reduction and cost reduction, and the elastic body (vibration-proof rubber) 130 is also required to be downsized.

  The protective cap part 140 covers the elastic body 130 and the elastic body side fixing member (nut and large and small washer) 150 that fixes the elastic body 130. The protective cap 140 is made of a material softer than the elastic body 130 so as to follow the displacement of the elastic body 130, and is in close contact with the outer peripheral surface 1341 of the large-diameter cylindrical portion 134 of the elastic body 130 to be fixed to the elastic body 130 and the elastic body side. The member 150 is covered. The protective cap part 140 is in contact with the first plate-like part 111 in a state of covering the elastic body 130 and the elastic body side fixing member 150. Thereby, the watertightness between the protective cap part 140 and the 1st plate-shaped part 111 is improved.

  The shape of the protective cap part 140 is not particularly limited, but is preferably formed corresponding to the outer shape of the elastic body 130. In the present embodiment, as shown in FIG. 5, the protective cap portion 140 is configured by connecting a small diameter portion 142 and a large diameter portion 144 with a tapered portion 146 and has an opening on the large diameter portion 144 side. The provided convex shape is used. Further, in the protective cap portion 140, the inner peripheral surface of the large diameter portion 144 is in close contact with the outer peripheral surface 1341 of the large diameter cylindrical portion 134 of the elastic body 130, and the small diameter portion 142 is connected to the end portion 35a of the underground wall side bolt 35. The inner diameter is larger than the outer diameter. At this time, the height of the large-diameter portion 144 is set to be greater than the height (thickness and axial length) of the large-diameter cylindrical portion 134 of the elastic body 130. The protective cap 140 may be made of any material as long as it is softer than the elastic body 130, but soft polyvinyl chloride is preferable. By making the protective cap part 140 made of soft polyvinyl chloride, it is excellent in water resistance, and rusting of the nut 152 and washers 154 and 156 in the protective cap part 140 can be prevented.

  Here, it is desirable that the inner diameter of the opening of the protective cap part 140 is made smaller than the outer diameter of the large-diameter cylindrical part 134 of the elastic body 130 by about 0.5 mm. Moreover, the thickness of the protective cap part 140 is preferably about 1 mm to 2 mm. If the thickness exceeds 2 mm, the deformation of the elastic body 130 is suppressed by the rigidity of the protective cap portion 140, and the desired vibration isolation performance in the elastic body 130 may not be obtained. Further, when the thickness is less than 1 mm, there is a concern that the protective cap part 140 may be stretched or torn when the anti-vibration separator 100 is installed, particularly when the protective cap part 140 is put on the elastic body 130. .

  The protective cap portion 140 is formed by attaching the elastic body 130 to the nut 152 in the main body frame portion 110 to the underground wall side bolt 35 erected from the underground steel frame 31 (see FIGS. 2 to 4) on the underground wall side. After fixing with the large and small washers 154 and 156, the body frame portion 110 is covered. However, the space in the main body frame portion 110 is narrow as the vibration-proof separator 100 itself is downsized. Therefore, by providing the protective cap portion 140 with the small diameter portion 142, the protective cap portion 140 is held by the elastic body 130, the nut 152, and the large and small washer 154 in the main body frame portion 110 while grasping the small diameter portion 142 of the protective cap portion 140. 156 and can be covered easily even in a narrow space. The underground wall side bolt 35 protruding from the nut 152 is accommodated in the inner diameter of the small diameter portion 142 of the protective cap portion 140.

  A clearance C (see FIG. 5) is provided between the protective cap part 140 and the support side part 116 of the main body frame part 110.

  For example, in the vibration proof separator 100 of the present embodiment, the outer diameter of the large-diameter cylindrical portion 134 is configured to be φ40 mm, height (thickness) 10 mm, and rubber hardness HA (JIS K 6253 durometer type A) 85 for elasticity. The protective cap 140 is made of soft polyvinyl chloride having a thickness of 2 mm. Further, for example, a clearance C of 6 mm is provided between the outer periphery of the large-diameter portion 144 of the protective cap portion 140 and the support side portion 116 constituting the side surface portion of the main body frame portion 110.

<Clearance between main body side surface and protective cap 140 (elastic body 130)>
The elastic body 130 (anti-vibration rubber) is designed so as to obtain a vibration isolation effect from a low frequency range (30 to 40 Hz). A predetermined clearance C (see FIG. 5) is provided so as not to come into contact with the support side portion in accordance with the amount of deformation of the designed elastic body 130 by placing concrete (800 kgf). The clearance C is set based on, for example, the following experiments 1 to 3.

・ Experiment 1
Experiment 1 shows that the outer diameter of the large-diameter cylindrical portion (the portion that receives the compressive force of 800 kgf) 134 of the elastic body 130 (anti-vibration rubber) at no load is φ50 mm, the thickness is 10 mm, and the rubber hardness is HA75 to HA95. The outer diameter of the large-diameter cylindrical portion 134 when the compression force of 800 kgf was applied while changing was measured. Specifically, rubber hardness HA was measured as HA75, HA80, HA85, HA90, and HA95. The measurement results are shown in Table 1. As shown in Table 1, the increase in the outer diameter at the time of 800 kgf compression load was +6 mm for rubber hardness HA75 and +2 mm for rubber hardness HA95.

・ Experiment 2
In Experiment 2, considering the downsizing of the vibration-proof separator itself, the outer diameter of the large-diameter cylindrical portion (a portion that receives a compression force of 800 kgf) 134 of the elastic body 130 (vibration-proof rubber) at no load is set to 40 mm, The other conditions were the same as in Experiment 1, and the outer diameter of the large-diameter cylindrical portion 134 when a compressive force of 800 kgf was applied was measured. The measurement results are shown in Table 2.

  As shown in Table 2, by reducing the outer diameter (area) of the large-diameter cylindrical portion 134 of the elastic body (anti-vibration rubber) 130, the spring constant of the elastic body 130 is lowered and the outer diameter is increased at the time of 800 kgf compression load. The amount is larger than in Experiment 1. However, if the rubber hardness is HA80 to HA95, preferably HA85 to HA95, the outer diameter at the time of 800 kgf compression load can be reduced to φ50 mm or less, and the large-diameter cylindrical portion 134 has an elastic body 130 with φ50 mm × thickness 10 mm. The size can be reduced as compared with the configuration to which is applied.

  Therefore, the clearance C required between the main body frame portion 110 and the large-diameter cylindrical portion 134 of the elastic body (anti-vibration rubber) 130 at the time of no load is about 8 mm with a rubber hardness HA80 when the thickness of the protective cap portion 140 is 2 mm. The rubber hardness HA90 is about 5 mm. Note that if the outer diameter of the large-diameter cylindrical portion 134 of the elastic body 130 is reduced to φ30 mm, the spring constant of the elastic body 130 is too low to withstand the 800 kgf compression load, and the large-diameter cylindrical portion 134 of the elastic body 130 is crushed. Concern will arise.

・ Experiment 3
In Experiment 3, the height (thickness) of the large-diameter cylindrical portion (portion receiving the compressive force of 800 kgf) 134 of the elastic body (antivibration rubber) 130 at no load was set to 20 mm, and other conditions were the same as in Experiment 2 The outer diameter of the large-diameter cylindrical portion 134 when a compressive force of 800 kgf was applied was measured. The measurement results are shown in Table 3.

  As shown in Table 3, by increasing the height (thickness) of the large-diameter cylindrical portion 134 of the elastic body (anti-vibration rubber) 130, the spring constant of the elastic body 130 decreases, and the outer diameter at the time of 800 kgf compression load. It was found that the increase amount was larger than the data of the same rubber hardness in Experiment 2.

  From the above, from the viewpoint of downsizing the vibration-proof separator 100, the rubber hardness is HA80 to HA95, preferably HA85 to HA95, and the outer diameter of the large-diameter cylindrical portion 134 of the elastic body 130 is about φ40 mm (φ37 to φ43), and the height (thickness) of the large-diameter cylindrical portion 134 is preferably about 10 mm (7 to 13 mm).

<Installation method>
A method for installing the anti-vibration separator 100 of this embodiment as a formwork apparatus will be described.

  First, underground steel frames 31 are embedded in the underground wall 30 at predetermined intervals, and the underground wall side bolts 35 are erected at predetermined locations. A buffer layer 32 is provided on the entire surface. In addition, as long as the buffer layer 32 is comprised with rubber | gum, such as a vibration-proof rubber mat, you may form the recessed part 36 in the site | part through which the underground wall side volt | bolt 35 is penetrated. Here, since the foam is used as the buffer layer 32, the recess 36 is not formed in advance. Then, the small-diameter cylindrical portion 132 of the elastic body 130 is inserted into the hole 111a of the first plate-like portion 111 of the main body frame portion 110 from the second plate-like portion 112 side to the first plate-like portion 111 inside the main body frame. Insert toward you. In this state, the large-diameter cylindrical portion 134 of the elastic body 130 is engaged with the inner surface 111b of the first plate-shaped portion 111, and a part 132c (see FIG. 5) of the small-diameter cylindrical portion 132 is outside the first plate-shaped portion 111. Protrudes towards.

  Next, the underground wall side bolt 35 is inserted into the through hole of the elastic body 130 from the side of the small diameter cylindrical portion 132 (part 132c of the small diameter cylindrical portion 132) projecting outward from the first plate-shaped portion 111, and the main body The frame part 110 is installed on the surface of the buffer layer 32 on the underground wall 30 side. At this time, a portion 132 c of the small diameter cylindrical portion 132 of the elastic body 130 is pushed into the buffer layer 32. As a result, the small-diameter cylindrical portion 132 is accommodated in the recess 36 of the buffer layer 32. In addition, when the recessed part 36 is the structure previously formed in the buffer layer 32, it functions as positioning at the time of attaching the anti-vibration separator 100. FIG.

  Next, the mold wall side bolt 48 extending from the mold frame 40 side is inserted into the hole 112 a of the second plate-like part 112 of the main body frame part 110, and the underground wall side bolt projecting into the main body frame part 110 is inserted. An elastic body side fixing member 150 (a large washer 154, a small washer 156, and a nut 152) is attached to the end portion 35a of the 35, and screwed together. Thereby, the elastic body 130 and the main body frame part 110 are fixed to the surface of the underground wall 30 side (specifically, the buffer layer 32).

  Next, a nut 61 as a frame body side fixing portion is attached to the mold side bolt 48 to fix the mold side bolt 48 and the second plate-like portion 112. Next, the protective cap part 140 and the small diameter part 142 are pinched and attached to the elastic body 130 and the elastic body side fixing member (large washer 154, small washer 156, nut 152) 150.

  Next, the opening part of the main body frame part 110 is cured and closed with a curing tape (here, adhesive tape) as a curing member. That is, a curing tape is provided on the outer periphery of the main body frame portion 110. Thereby, the space in the main body frame part 110, that is, the space between the second plate-like part 112 and the first plate-like part 111 is closed.

  Next, concrete is placed between the buffer layer 32 and the mold 40 (a region indicated by a separation distance R in FIG. 2). At this time, the mold-side bolts 48 and the vibration-proof separator 100 are embedded in the concrete.

  At the time of placing the concrete, a force that pushes and spreads the mold 40 acts, and a tensile force (800 kgf) acts on the frame 40 side with respect to the main body frame portion 110 of the anti-vibration separator. On the other hand, since the underground wall side bolt 35 is fixed to the underground steel frame 31 embedded in the underground wall 30, a compressive force acts on the large-diameter cylindrical portion 134 of the elastic body 130. When receiving this compressive force, the large-diameter cylindrical portion 134 of the elastic body 130 swells in the main body frame portion 110 toward the outer peripheral surface orthogonal to the compression direction (the axial direction of the underground wall side bolt 35). At this time, since the clearance C is provided between the elastic body 130 covered with the protective cap part 140 and the support side part 116 so as not to contact, the large-diameter cylindrical part 134 contacts the support side part 116. It deforms effectively.

In the anti-vibration separator 100 in the concrete, the inner peripheral surface of the large diameter portion 144 of the protective cap portion 140 is in close contact with the outer peripheral surface 1341 of the large diameter cylindrical portion 134 of the elastic body 130.
Then, after the concrete is hardened, the support and the formwork 40 are removed, and if there is a bolt bar protruding from the concrete surface, it is cut and removed. Thereby, a concrete wall having a predetermined thickness can be constructed in the ground along the underground wall.

<Effect>
In the method of constructing a concrete wall using the vibration isolating separator 100 according to the present embodiment, the main body of the anti-vibration separator 100 interposed between the buffer layer 32 and the formwork 40 that follows the underground wall 30 is provided. The opening portion of the frame portion 110 is cured with a curing tape such as an adhesive tape and then closed, and then concrete is placed. Thereby, normally, a clearance gap does not arise in the obstruction | occlusion part by a curing tape. However, when a gap occurs in the closed portion that has been cured due to an unexpected load during construction or an excessive force due to an earthquake or the like, paste-like cement may flow into the main body frame portion 110. When the cement that has flowed in adheres over the elastic body 130 and the main body frame portion 110 as in the conventional configuration, the cement is rigid after the concrete is hardened, so vibration transmitted from the underground wall to the underground wall side bolt 35 is transmitted. However, when the cured elastic body 130, the main body frame portion 110, and the formwork side bolt 48 are conducted and transmitted to the placed concrete, vibration noise is generated.

  On the other hand, in the present embodiment, the elastic body 130 is covered with the protective cap portion 140 so as to be in close contact with the outer peripheral surface 1341 of the large-diameter cylindrical portion 134 of the elastic body 130. The paste-like cement that has flowed into the main body frame 110 does not adhere to the elastic-body-side fixing member (nut 152, large and small washers 154, 156) 150.

  Thereby, the isolation | separation state of the underground wall side volt | bolt 35 and the main body frame part 110 (specifically, the formwork side volt | bolt 48) can be maintained, and the transmission of the vibration mentioned above does not generate | occur | produce.

  Further, by forming the protective cap portion 140 from a material softer than the elastic body 130, the protective cap portion 140 is deformed following the deformation of the elastic body 130. Accordingly, the movement of the elastic body 130 is not suppressed, and the vibration isolating function of the elastic body 130 is not deteriorated.

  As described above, according to the present embodiment, in the anti-vibration separator 100, the elastic body 130 fixed to the underground wall side bolt 35 and the main body frame portion 110 fixed to the mold side bolt 48 are separated. Therefore, vibration transmission from the underground wall 30 side to the concrete wall constructed by placing concrete is surely cut off. That is, the concrete wall which prevented the transmission of the vibration from the underground wall side, such as a retaining wall, to the formwork side can be constructed suitably.

  In addition, since the clearance C is provided between the outer peripheral surface of the elastic body 130 (specifically, the protective cap portion 140) and the support side portion 116, the elastic body 130 is caused to radially move due to the compressive force generated when the concrete is placed. Even if it swells, it does not contact the main body frame 110. Thereby, even if compressive force is given to anti-vibration separator 100, the motion of elastic body 130 is not restrained and stable vibration isolation performance can be obtained.

  The shape of the protective cap portion 140 is a convex shape in which the small diameter portion 142 and the large diameter portion 144 are connected to the tapered portion 146 and an opening is provided on the large diameter portion 144 side. Thereby, in the main body frame part 110 with a small space, the small diameter part of the protective cap part 140 can be put on the anti-vibration rubber, the nut, and the washer while the knob is held, and the work is facilitated.

(Modification 1)
FIG. 8 is a diagram for explaining a first modification of the vibration-proof separator according to the embodiment of the present invention. Note that the vibration isolating separator 100A shown in FIG. 8 has the same basic configuration as the vibration isolating separator 100 corresponding to the embodiment shown in FIGS. A description thereof will be omitted.

  An anti-vibration separator 100A shown in FIG. 8 is configured to include a main body frame portion 110A in place of the main body frame portion 110 of the anti-vibration separator 100 according to one embodiment. The main body frame portion 110A includes a first plate-like portion 111A, a second plate-like portion 112A, and a connecting member 170 having a high nut 173 and bolts 172 and 172.

A plurality of bolt through holes are provided in the peripheral portion of the first plate-like portion 111A with the hole 111a as the center (for example, four locations at symmetrical positions).
In the second plate-like portion 112A, a plurality of bolt through-holes are also provided on the periphery of the hole 112a at positions corresponding to the bolt through-holes of the first plate-like portion 111A. The high nut 173 corresponds to each bolt through hole between the first plate portion 111A and the second plate portion 112A so that the first plate portion 111A and the second plate portion 112A face each other. (Fig. 8 shows only one place). One of the high nuts 173 is screwed by the bolt 172 through the bolt through hole of the first plate-like portion 111A, and the other is screwed by the bolt 172 through the bolt through-hole of the second plate-like portion 112A. . The first plate portion 111A and the second plate portion 112A are fixed by the bolts 172 so as to face each other.

  As a result, the first plate-like portion 111A and the second plate-like portion 112A are spaced apart and fixed via the connecting member 170 to form the main body frame portion 110A. A surface surrounded by the first plate-like portion 111A, the second plate-like portion 112A, and the connecting member 170 of the main body frame portion 110A is opened, and an internal space between the first plate-like portion 111A and the second plate-like portion 112A. Communicates with the outside. Here, the outer periphery of the main body frame portion 110A opens at a portion where the high nut 173 is not provided.

  The fixing of the underground wall side bolt (underground wall side rod-like body) 35 and the first plate-like portion 111A, and the fixing of the mold-frame side bolt (form frame side rod-like body) 48 and the second plate-like portion 112A, respectively, The same as the fixation between the underground wall side bolt (underground wall side rod-shaped body) 35 and the first plate-like portion 111 and the fixation between the mold-frame side bolt (form frame side rod-like body) 48 and the second plate-like portion 112. Therefore, explanation is omitted.

  When this anti-vibration separator 100A is used, the anti-vibration separator 100A is installed between the buffer layer 32 and the formwork 40 along the underground wall 30 shown in FIG. (2) First plate-like portion) 112A and 111A are cured with a curing tape so as to surround the outer periphery, and the space between the two flat plates 112A and 111A is closed. As a result, the vibration isolating separator 100A, like the vibration isolating separator 100 according to the above-described embodiment, prevents the transmission of vibration from the underground wall 30 side to the formwork 40 side, and the concrete wall in the ground. It can be formed easily.

  2 to 7, the elastic body 130 may have a configuration in which a protrusion is provided on at least one surface of the elastic body 130. An example of this is shown in FIG.

  FIG. 9 is a diagram for explaining a modification of the elastic body 130.

  The elastic bodies 130A and 130B shown in FIG. 9 are provided with a protrusion 180 on at least one end face of the end face of the large-diameter cylindrical part 134 in the convex body configured in the same manner as the elastic body 130 in the structure of the anti-vibration separator 100. It is formed by that. FIG. 9A is a diagram in which protrusions 180 are provided on a surface (a contact surface with the first plate-like portion 111) 134a on the small-diameter cylindrical portion side of the large-diameter cylindrical portion 134, and FIG. It is formed by providing a protrusion 180 on the surface.

  9A and 9B, the elastic body 130 is fastened and fixed to the underground wall-side bolt 35 via the nut 152 by providing a projection 180 on the large-diameter cylindrical portion 134 of the elastic body 130. In this case, the projecting portion 180 is first pressed to generate a certain tightening torque, and then the end surface provided with the projecting portion 180 is pressed to generate a larger tightening torque. Thus, the elastic body 130 due to the tightening is obtained by setting the changing point of the torque amount when the tightening is transferred from the projecting portion 180 to the end face provided with the projecting portion 180 as the tightening amount of the elastic body 130. The amount of deformation of the elastic body 130 can be made constant, and the vibration isolation performance of the elastic body 130 can be stabilized.

  As a result, even if the elastic body 130 is compressed and deformed by tightening the nut, the amount of tightening is not known.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The embodiment of the present invention has been described above. The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. That is, the description of the configuration of the apparatus and the shape of each part is an example, and it is obvious that various modifications and additions to these examples are possible within the scope of the present invention.

20 Formwork device 30 Underground wall 31 Underground steel frame 32 Buffer layer 32a, 32b Buffer material 33 Fastening member 35 Underground wall side bolt (underground wall side rod-shaped body)
36 Concave part 40 Formwork 48 Formwork side bolt (Formwork side bar)
48a One end portion 48b The other end portion 50 Concrete wall 61 Nut (fixing member on the formwork side)
100, 100A Anti-vibration separator 110, 110A Main body frame portion 111, 111A First plate-like portion 111a Hole portion 111b Inner surface 112, 112A Second plate-like portion 112a Hole portion 116 Support side portion (connection member)
130, 130A, 130B Elastic body 132 Small diameter cylindrical portion 132c Part 134 Large diameter cylindrical portion 135 Through hole 140 Protection cap portion 142 Small diameter portion 144 Large diameter portion 146 Tapered portion 150 Elastic body side fixing member 152 Nut 154 Large washer 156 Small washer 170 Connecting member 173 High nut 180 Protruding part 1341 Outer peripheral surface 134a Contact surface

Claims (9)

A steel material and a buffer layer are attached to the underground wall, and a mold frame is set apart from the buffer layer. When concrete is placed between the buffer layer and the mold frame, it is fixed to the steel material. And a projecting side end portion of the underground wall side rod-shaped body that penetrates the buffer layer and protrudes toward the mold frame side, and the mold wall side rod-shaped body projectingly provided on the mold frame on the underground wall side rod-shaped body side An anti-vibration separator that is spaced apart from the end portion and maintains the distance between the buffer layer and the mold,
A first plate-like portion that is in contact with the buffer layer; a second plate-like portion that is spaced apart from the first plate-like portion on the mold side; the first plate-like portion; A main body frame portion having a connecting member for integrating the second plate-like portion;
A mold side fixing member that fixes an end of the mold side rod-like body to the second plate-like part;
An elastically deformable cylindrical elastic body that is disposed between the first plate-like portion and the second plate-like portion and engages with a hole formed in the first plate-like portion;
Have
The projecting side end portion of the underground wall side rod-like body projects through the through hole of the cylindrical elastic body, and is fixed to the end surface of the cylindrical elastic body on the mold side by an elastic body side fixing member. ,
The cylindrical elastic body is deformed following the outer shape of the cylindrical elastic body, and is covered with a protective cap portion that is in close contact with the outer peripheral surface of the cylindrical elastic body,
The anti-vibration separator, wherein the protective cap part is in contact with the first plate-like part. The protective cap part covers the elastic body side fixing member together with the cylindrical elastic body.
The anti-vibration separator according to claim 1. A clearance is provided between the outer peripheral surface of the protective cap part and the connecting member.
The anti-vibration separator according to claim 1 or 2. On the outer periphery of the main body frame part, a curing member is provided,
The anti-vibration separator according to any one of claims 1 to 3. The cylindrical elastic body is composed of a large diameter cylindrical portion and a small diameter cylindrical portion,
The large-diameter cylindrical portion is disposed between the first plate-like portion and the second plate-like portion so as to contact the first plate-like portion,
The small-diameter cylindrical portion protrudes from the hole portion of the first plate-like portion,
The anti-vibration separator as described in any one of Claim 1 to 4. The protective cap portion has a large-diameter portion that covers the large-diameter cylindrical portion via an opening, and a small-diameter that is connected to the large-diameter portion with a tapered portion and protrudes toward the second plate-shaped portion. The part is formed into a convex shape,
The inner peripheral surface of the large-diameter portion is in close contact with the outer peripheral surface of the large-diameter cylindrical portion of the elastic body, and the small-diameter portion has an inner diameter larger than the outer diameter of the protruding-side end portion of the underground wall side rod-shaped body. Have
The anti-vibration separator according to claim 5. In the large-diameter cylindrical portion, a protrusion is provided on at least one of the end surface contacting the first plate-shaped portion and the end surface contacting the elastic body-side fixing member.
The anti-vibration separator according to claim 5 or 6. The connecting member is a pair of plate-like members that are connected to be orthogonal to both the first plate-like portion and the second plate-like portion and face each other.
The anti-vibration separator according to any one of claims 1 to 7. The connecting member has a high nut and a bolt,
A plurality of the high nuts are provided between the first plate-like portion and the second plate-like portion, and are fixed by the bolts so that the first plate-like portion and the second plate-like portion face each other. ing,
The anti-vibration separator according to any one of claims 1 to 7.

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