JP3803886B2 - Attaching the gibber to the caisson rubber - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for attaching a gibber for joining a concrete caisson and a caisson rubber to a caisson rubber laid between a concrete caisson and a base in the caisson method.
[0002]
[Description of Related Art]
Since various materials such as caisson rubber and gibber used in the caisson method are known, a detailed description of their definition and usage will be omitted.
In the caisson method, a rubber mat, so-called caisson rubber or caisson mat is laid between the base and the concrete caisson in order to increase the frictional resistance between them. The caisson rubber and the concrete caisson are connected and fixed to each other with a dowel.
[0003]
The gibber is usually composed of a head part or a nut embedded in a caisson rubber and an anchor bolt part or a bolt embedded in a concrete caisson.
[0004]
Conventional methods of attaching a gibber to a caisson rubber manufactured by a compression molding method are roughly classified into two methods. One is a method represented by the invention described in JP-A-7-71041. If this conventional method is required, the diver is manufactured in advance integrally with anchor bolts and nuts, while the caisson rubber is provided with a through hole having a shape corresponding to the cross-sectional shape of the diver, and the bottom of the through hole is This is a method of inserting a gibber.
[0005]
In this conventional method, since the gibber is manufactured in advance with anchor bolts and nuts, the penetration and fixing of the diver to the caisson rubber are completed in one step, or the caisson rubber is easy to manufacture. On the other hand, at the construction site of concrete caisson, in order to insert the diver from the through hole, it is necessary to bend the caisson rubber and expand the diameter of the through hole, which has the disadvantage that the required labor is large .
[0006]
Another conventional method is to manufacture a diver divided into two elements: a nut embedded in a caisson rubber and an anchor bolt embedded in a concrete caisson, while the caisson rubber includes a nut and an anchor bolt. This is a method in which a through hole having a predetermined shape for accommodating a part is provided and manufactured, and a nut and an anchor bolt are screwed into the accommodation hole at a concrete caisson construction site. This conventional method is divided into two parts, so it requires less labor compared to the conventional method in which the nut and bolt are integrated into each other through the narrow through hole. There are disadvantages in that the number of steps for inserting the dowel is increased by one and the number of parts handled is increased.
[0007]
Yet another conventional method is the invention described in Japanese Patent Laid-Open No. 7-127072. If this conventional method is required, a predetermined amount of powder rubber is filled in the lower mold of the mold for compressing the caisson rubber, or a rubber sheet having a predetermined thickness is laminated, and then the powder rubber layer Alternatively, a nut is placed on the laminated rubber sheet, and then the powder rubber is further filled so that the upper surface of the nut is exposed. Alternatively, the rubber sheet is laminated and combined with the upper mold and vulcanized and molded. In this method, a rubber is manufactured and a nut is embedded in the rubber.
[0008]
The disadvantage of this conventional method is that a predetermined amount of powder rubber is filled in the lower mold of the compression mold in advance, or a rubber sheet having a predetermined thickness is laminated, and then the powder rubber layer or the laminated rubber sheet is overlaid. It is necessary to take into account the shrinkage rate during vulcanization of the rubber when placing the nut on the top and then filling it with powder rubber so that the top surface of the nut is exposed or laminating the rubber sheet. Further, it is difficult to determine the amount of rubber charged and to position the nut, and further, there are disadvantages that the nut portion is difficult to be perpendicular to the rubber mat and is inclined.
[0009]
[Problems to be solved by the invention]
Therefore, the problem to be solved by the invention is that the nut, which is one of the members of the gibber, was not vulcanized and bonded into the caisson rubber at the same time as the caisson rubber was vulcanized, embedded and fixed. is there.
[0010]
Another problem to be solved by the invention is that a nut, which is one member of a gibber, is vulcanized and molded into a caisson rubber, and at the same time, precisely and easily vulcanized and bonded to any desired position in the caisson rubber. It was impossible to embed, fix.
Further problems to be solved by the invention will be clarified sequentially below.
[0011]
[Means for Solving the Problems]
In developing the means for solving the problems, the inventors of the present invention divided the diver into two elements, that is, a flanged nut and an anchor bolt, and the flanged nut was fixed to a predetermined lower die of the compression mold. We considered fixing it to a position with a support jig in a detachable manner.
[0012]
A means for solving the problems achieved as a result is a method of attaching a gibber for joining a concrete caisson and a caisson rubber to a caisson rubber laid between a concrete caisson and a base in the caisson method.
(1) Dividing the diver into at least two elements: a nut with a flange and an anchor bolt of a predetermined length screwed with the nut;
(2) Prepare a mold for compressing caisson rubber consisting of an upper mold and a bowl-shaped lower mold,
(3) A caisson rubber in which the flanged nut, which is one member of the gibber, is formed in the caisson rubber so that the flange is downward and the nut is upward, and the nut head is molded. Positioning so that the bottom of the flange does not protrude from the bottom of the molded caisson rubber, and is fixed to the top surface of the bowl-shaped lower mold,
(4) A predetermined amount of rubber is filled into the bowl-shaped lower mold, and the caisson rubber is compression molded in combination with the upper mold, and at the same time, the nut with flange is vulcanized in the caisson rubber. A method of attaching a gibber to a caisson rubber comprising bonding, embedding, fixing, and (5) vulcanizing and adhering in caisson rubber, and screwing together the flanged nut and the anchor bolt. It is.
[0013]
In the method of the present invention, one method for fixing the flanged nut to the upper surface of the bowl-shaped lower mold is to provide a through hole on the same axis of the nut and the flange, while the supporting jig has a predetermined shape and structure. It is performed by forming and fixing to the upper surface of the bowl-shaped lower mold by a predetermined means. The shape and structure of the support jig in this case is not particularly limited. For example, a cross-section having a bottom and a shaft is manufactured from an inverted T-shaped metal, and the shaft is provided coaxially with a nut and a flange. This is done by fitting into the through hole and fixing the bottom to the upper surface of the bowl-shaped lower mold.
[0014]
In this method, when the bottom surface of the bottom of the support jig is formed flat, it can be fixed to the upper surface of the bowl-shaped lower mold by welding, screwing, etc., and a male screw is provided on the lower bottom surface of the bottom. A supporting jig is provided by attaching a shaft core of a predetermined size, while providing a hollow hole with a female thread on the upper surface of the bowl-shaped lower mold, and screwing the shaft core into the cavity hole. Can be detachably attached to the upper surface of the bowl-shaped lower mold. When the flanged nut is fixed to the upper surface of the bowl-shaped lower mold by this method, the cavity surface of the bottom of the nut is sealed at the bottom of the support jig and the inflow of rubber into the nut is prevented.
[0015]
In the method of the present invention, another method for fixing the flanged nut to the upper surface of the bowl-shaped lower mold is to provide at least two through holes as far as possible in the flange and to insert the support into the through holes. This is performed by fixing the tool to the upper surface of the bowl-shaped lower mold by a predetermined means. The shape and structure of the support jig in this case is not particularly limited. For example, the cross section having the bottom portion and the shaft portion is manufactured from an inverted T-shaped metal, and the diameter of the shaft portion is the diameter of the through hole provided in the flange. It can be easily inserted by making it somewhat smaller.
[0016]
In this method, when the bottom surface of the bottom of the support jig is formed flat, it can be fixed to the upper surface of the bowl-shaped lower mold by welding, screwing, etc., and a male screw is provided on the lower bottom surface of the bottom. A supporting jig is provided by attaching a shaft core of a predetermined size, while providing a hollow hole with a female thread on the upper surface of the bowl-shaped lower mold, and screwing the shaft core into the cavity hole. Can be detachably attached to the upper surface of the bowl-shaped lower mold. In the case of this method, the cavity hole of the nut is closed by the flange, so that the rubber does not flow into the nut.
[0017]
In the method of the present invention, yet another method for fixing the flanged nut to the upper surface of the bowl-shaped lower mold is a method that does not use the support jig having the shape described above. That is, it is a method in which a fixing element for fixing the flange is provided on the upper surface of the bowl-shaped lower mold in accordance with the shape of the flange such as a circle and a square, and the flange is arranged between the fixing elements and fixed. .
[0018]
The position of the flanged nut inside the caisson rubber is arbitrarily adjusted by changing the thickness of the bottom of the support jig. That is, when the bottom portion of the support jig is thickened, the flanged nut can be positioned above the caisson rubber.
[0019]
The rubber filled in the lower mold to which the nut with flange is fixed may be powder rubber or a rolled rubber sheet, but a rolled rubber sheet is preferable in consideration of the fluidity of unvulcanized rubber.
[0020]
When carrying out the present invention, in order to prevent the flowed rubber from flowing into the cavity of the nut, it is possible to fit a screw thread into the cavity of the nut and to apply a vulcanized adhesive to the flange. It is preferable from the viewpoint of workability.
[0021]
Since the present invention is characterized by a method of fixing a flanged nut, which is one member of a gibber, to the upper surface of a lower mold for compression molding a caisson rubber, an anchor bolt, a nut, and a caisson rubber The shape, structure and physical properties of other members such as the number of nuts per unit area of caisson rubber are not particularly limited.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
The gibber 1 used in the present invention is formed of two elements, an anchor bolt 2 and a nut 3 with a flange 4.
[0023]
As long as the anchor bolt 2 has a male screw M and is screwed into engagement with the female screw F on the inner surface of the nut 3, its shape, structure, etc. are not particularly limited. In order to further increase the anchoring effect with the concrete caisson, it is preferable to provide a protruding piece 5 having an arbitrary shape on the head. Therefore, a conventionally used hexagonal bolt, square bolt, butterfly bolt, or the like can be used.
[0024]
The flange 4 may be fixed to the nut 3 by means such as welding, or the flange 4 and the nut 3 may be integrally formed by an appropriate method. The nut 3 has a female screw F on its inner surface, and is screwed with the male screw M of the anchor bolt 2.
[0025]
One method for fixing the flange 4 to the upper surface of the lower mold 11 using the support jig 6 will be described with reference to FIG. The flange 4 is provided with a through hole corresponding to the cavity hole of the nut 3. The support jig 6 is integrally formed from three elements: a support jig shaft portion 7a, a support jig bottom portion 9, and a support jig shaft core 8a having a male screw m cut. On the other hand, on the upper surface of the lower mold 11, a cavity hole 10 is formed at a position corresponding to the support jig shaft 8 a by cutting a female screw f to be screwed with the male screw m of the support jig shaft 8 a. The support jig shaft core 8a is screwed with the female screw f of the cavity hole 10 to fix the support jig 6 to the upper surface of the lower mold. Next, the nut 3 with the flange 4 can be fixed to the upper surface of the lower mold by inserting the support jig shaft portion 7 a into the cavity hole of the nut 3. In the case of this method, the support jig bottom 9 of the support jig 6 closes the through hole that penetrates the flange 4 and the nut 3, so that the molten rubber can be prevented from flowing into the through hole.
[0026]
Another method for fixing the flange 4 to the upper surface of the lower mold 11 using the support jig 6 will be described with reference to FIG. At least two through holes 12 are provided in the flange 4. The support jig 6 is integrally formed from three elements: a support jig shaft portion 7b, a support jig bottom portion 9, and a support jig shaft core 8b having a male screw m cut. On the other hand, on the upper surface of the lower mold 11, a hollow hole 13 is formed at a position corresponding to the through-hole 12, and a female screw f screwed with the support jig shaft 8 b is cut. The support jig shaft core 8 b is screwed with the female screw f of the cavity hole 13 to fix the support jig 6 to the upper surface of the lower mold 11. Next, the nut 3 with the flange 4 can be fixed to the upper surface of the lower mold 11 by fitting the support jig shaft portion 7 b into the through hole 12.
[0027]
The position of the nut 3 with the flange 4 inside the caisson rubber can be adjusted to some extent by changing the thickness of the support jig bottom 9 of the support jig 6. That is, when the support jig base 9 of the support base 6 is thickened, the position of the nut 3 with the flange 4 inside the lower mold 11 is increased, and as a result, the flange 4 inside the caisson rubber vulcanized and molded. The embedded position of the attached nut 3 is increased.
[0028]
After fixing any number of flanged nuts coated with vulcanized adhesive on the upper surface of the lower mold of the mold for compression molding caisson rubber by the method illustrated in FIG. 1 or FIG. After fitting a screw screw that prevents the rubber from flowing into the cavity hole in the nut to the head of the nut, the rubber is filled into the lower mold, the upper mold is set, and compression molding is performed under specified conditions. When the mold is removed, a caisson rubber having a flanged nut vulcanized and bonded therein is produced.
[0029]
When the flanged nut is fixed to the upper surface of the lower mold of the mold for compression molding the caisson rubber by the one-point support method shown in FIG. 1, the support jig supports as shown in FIG. A caisson rubber in which rubber is not applied to a portion corresponding to the bottom of the jig is manufactured.
[0030]
On the other hand, when the flanged nut is fixed to the upper surface of the lower mold of the mold for compressing the caisson rubber by the two-point support method shown in FIG. 3, as shown in FIG. A caisson rubber in which rubber is not substantially applied to the portion corresponding to the through hole provided and the bottom of the support jig of the support jig is manufactured.
[0031]
The one-point support method described in FIG. 1 or the two-point support method described in FIG. 3 should be determined in consideration of various conditions. For example, when placing ready rubber during vulcanization, the two-point support method is preferable in terms of the positional stability of the flange. In addition, a one-point support method is preferable from the viewpoint of ease of taking out the product after vulcanization. Furthermore, from the viewpoint of the number of steps for forming a through hole in the flange, there is an advantage that the one-point support method is cheap in terms of cost.
[0032]
Embodiments will be described below with reference to the accompanying drawings.
[Example 1]
As shown in FIG. 1, the anchor bolt (2) was a hexagonal bolt having a diameter of 12 mm and a neck of 100 mm and having a male screw (M) cut at the entire lower end. As the nut (3), two circular nuts having a diameter of 20 mm and a height of 10 mm were overlapped and joined by spot welding. The peel strength of spot welding was set to 1.2 to 1.5 tons. A flange (4) having a thickness of 4.5 mm and a side of 40 mm was welded to the nut (3) to be integrally formed.
[0033]
The support jig (6) has a steel support jig shaft (7a) having a height of 10 mm and a diameter of 9 mm, a steel circular support jig bottom (9) having a diameter of 30 mm and a thickness of 2.5 mm, and a height. A steel support jig shaft core (8a) having a diameter of 9 mm and a diameter of 8 mm was integrally formed by cutting. A male screw (m) was cut on the support jig shaft core (8a). On the other hand, 15 hollow holes (10) having a diameter of 8 mm and a depth of 9 mm were provided at predetermined positions on the upper surface of the lower mold (11). A female screw (f) was cut on the inner surface of the cavity hole (10).
[0034]
The lower die (11) of the caisson rubber compression molding die having a length of 2056m, a width of 1030mm, and a depth of 30mm is inserted into the male screw (m) of the support jig shaft core (8a) of the 15 support jigs (6). The inner hole of the hollow hole (10) was fixed by screwing with the female screw (f). Next, the nut (3) and the flange (4) are provided on the same axis, and the support jig shaft portion (7a) of the support jig (6) is fitted into the through-hole, so that a total of 15 nuts with flanges are plated. The mold (11) was detachably fixed to the upper surface.
[0035]
A Mekura screw was fitted to the head of the nut (3). Next, natural rubber and synthetic rubber are used as binders, used rubber powder is blended, a cross-linking agent is mixed therewith, and 7 sheets of 5 mm thick rolled are laminated in the lower mold, and the upper mold is assembled. It was set and vulcanized at a pressure of 150 kg / cm ² and a temperature of 160 ° C., and caisson rubber was compression molded. The mold was removed, the rubber on the top of the screw screw was deburred, and the screw screw was removed.
[0036]
The caisson rubber with 15 flanged nuts manufactured and vulcanized and bonded to the concrete caisson construction site is transported to the concrete caisson construction site, and the anchor bolt (2) is screwed onto the nut (3) at the site. To form the gibber (1). The pulling strength of the gibber (1) with respect to the caisson rubber (14) was measured and found to be 800 kg.
[0037]
[Construction Example 1]
Concrete having a predetermined blending design was placed on the caisson rubber to which the gibber was attached, which was manufactured in Example 1. After the concrete was cured, the pull-out strength against the concrete of the gibber was measured, and a predetermined value was obtained.
[0038]
[Example 2]
Anchor bolts (2), nuts (3), and flanges (4) having the same shape as in Example 1 were used. However, as shown in FIG. 3, the flange (4) was provided with two through holes (12) having a diameter of 7 mm on a diagonal line.
[0039]
The support jig (6) includes a steel support jig shaft (7b) having a height of 12 mm and a diameter of 6.5 mm, a steel circular support jig bottom (9) having a diameter of 24 mm and a thickness of 2.5 mm, and A steel support jig shaft core (8b) having a height of 9 mm and a diameter of 8 mm was integrally formed by cutting. A male screw (m) was cut in the support jig shaft core (8b). On the other hand, 30 hollow holes (13) having a diameter of 8 mm and a depth of 9 mm were provided at predetermined positions on the upper surface of the lower mold (11). A female screw (f) was cut on the inner surface of the cavity hole (13).
[0040]
The lower die (11) of the caisson rubber compression molding die having a length of 2056 mm, a width of 1030 mm, and a depth of 30 mm is inserted into the male screw (m) of the support jig shaft core (8b) of the 30 support jigs (6). And screwed into the female screw (f) on the inner surface of the cavity hole (13). Next, the support jig shaft portion (8b) of the support jig (6) is fitted into the through hole (12) provided in the flange (4), and a total of 15 nuts with flanges are placed on the lower mold (11). Removably fixed to the surface.
[0041]
A screw screw was fitted into the hole in the nut. Next, in the same procedure as in Example 1, a caisson rubber in which 15 flanged nuts were vulcanized and bonded inside was manufactured.
[0042]
The caisson rubber in which 15 flanged nuts manufactured by the method of Example 2 were vulcanized and bonded to the inside was transported to the concrete caisson construction site, and the anchor bolt (2) was screwed onto the nut (3) at the site. And integrated to form the gibber (1). The pulling strength of the gibber (2) with respect to the caisson rubber (14) was measured and found to be 800 kg.
[0043]
[Construction Example 2]
Concrete having a predetermined blending design was placed on the caisson rubber to which the gibber was attached, which was manufactured in Example 2. After the concrete was cured, the pull-out strength against the concrete of the gibber was measured, and a predetermined value was obtained.
[0044]
【The invention's effect】
As described above, in the present invention, the flanged nut, which is one of the members of the gibber, is fixed by vulcanizing and bonding at a predetermined position inside the caisson rubber at the same time as the caisson rubber is compression-molded. Effect is effective;
[0045]
(1) After manufacturing a caisson rubber having a hollow hole for inserting a nut with a flange and an anchor bolt afterwards, a flanged nut and an anchor bolt are inserted into the hollow hole at a construction site of a concrete caisson. In comparison, the adhesive strength or holding force of the flanged nut with respect to the caisson rubber is improved.
[0046]
(2) After manufacturing a caisson rubber having a hollow hole for inserting a flanged nut and an anchor bolt afterwards, a flanged nut and an anchor bolt are inserted into the hollow hole at a construction site of a concrete caisson. In comparison, the required labor is greatly reduced.
[0047]
(3) The position of the flanged nut within the caisson rubber can be easily adjusted simply by changing the height of the support jig for fixing the flanged nut to the lower mold of the compression mold.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a first embodiment.
2 is a cross-sectional view illustrating Example 1. FIG.
FIG. 3 is a perspective view for explaining Example 2;
4 is a cross-sectional view illustrating Example 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Giber 2 Anchor bolt 3 Nut 4 Flange 5 Head 6 Support jig 7a Support jig shaft portion 7b Support jig shaft portion 8a Support jig shaft core 8b Support jig shaft core 9 Support jig bottom portion 10 Cavity hole 11 Bottom Mold 12 Through hole 13 Cavity hole 14 Caisson rubber 15 Recessed part M Male screw m Male screw F Female screw f Female screw

Claims (4)

In the caisson method, a gibber for joining a concrete caisson and a caisson rubber is attached to a caisson rubber laid between a concrete caisson and a base;
(1) The diver is formed by dividing it into at least two elements: a nut with a flange and an anchor bolt having a predetermined length screwed with the nut.
(2) Preparing a mold for compressing the caisson rubber comprising an upper mold and a bowl-shaped lower mold,
(3) A caisson rubber in which the nut with the flange, which is one member of the gibber, is formed in the molded caisson rubber so that the flange is downward and the nut is upward. Positioning so that the bottom of the flange does not protrude from the bottom of the molded caisson rubber, and is fixed to the top surface of the bowl-shaped lower mold,
(4) Fixing the nut with the flange to the upper surface of the bowl-shaped lower mold, a support jig to be inserted into a through hole provided coaxially with the nut and the flange, Performing by adhering to the surface by a predetermined means,
(5) Filling the bowl-shaped lower mold with a predetermined amount of rubber, vulcanizing the rubber in combination with the upper mold and compressing the caisson rubber, and simultaneously vulcanizing the nut with flange in the caisson rubber. Glue, bury, fix,
A method for attaching a gibber to a caisson rubber, characterized in that the flange nut and anchor bolt are screwed together by vulcanizing and adhering in a caisson rubber and embedded and fixed. Fixing the nut with the flange to the upper surface of the bowl-shaped lower mold, a support jig to be inserted into at least two through-holes provided in the flange to the upper surface of the bowl-shaped lower mold. 2. The method of attaching a gibber to a caisson rubber as claimed in claim 1, wherein the method is performed by fixing by means. Fixing of the nut with flange to the upper surface of the bowl-shaped lower mold by fixing means for fixing the flange provided on the upper surface of the bowl-shaped lower mold in correspondence with the shape of the flange The method of attaching a gibber to a caisson rubber according to claim 1, wherein: 2. The method of attaching a gibber to a caisson rubber according to claim 1, wherein the rubber is a plurality of rolled sheets.

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