JP2001065069A - Connecting metal fitting of concrete product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce labor of connecting work by connecting both concrete products by a bolt and a nut by using connecting plates worked in a shape such as a horseshoe shape and washers adjusted to these shapes. SOLUTION: A meshing error can be absorbed by loose holes opened in plates 10a, 10b and semicircular column-shaped washers 20a, 20b. A bolt 30 is fastened, and products are brought into pressure contact with each other to be connected. When tensile force acts on connecting precast concrete products C1, C2, the tensile force is transmitted to the plates 10a, 10b through fixing anchor bolts 60a, 60b. This force is uniformly transmitted to the semicircular column-shaped washers 20a, 20b so that the plates 10a, 10b do not deflect. The semicircular column-shaped washers 20a, 20b are restricted by the bolt 30, compressive force acts on the semicircular column-shaped washers 20a, 20b, and only tensile force acts on the bolt 30. Tensile strength of the bolt 30 and the plates 10a, 10b endures so as not to separate concrete C1, C2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete product which can be connected easily by connecting concrete products or dividing concrete members into one unit, saving labor and time, and connecting the connecting surfaces by pressing. It relates to a connection fitting.

[0002]

2. Description of the Related Art With reference to FIG. 8, a first conventional example of a structure in which concrete products are connected by bolts straddling a connecting portion will be described. U-shaped metal plates P1 and P2 are embedded in the joints of the concrete products A1 and A2 in advance at the time of product production. The metal plates P1 and P2 have large holes for passing bolts, and concrete It is firmly established inside. After a concrete product is installed at a predetermined position, it is tightened and connected by bolts B1 and nuts B2, and has been frequently used for connecting precast products.

With reference to FIG. 9, a second conventional example of a structure in which a concrete product is connected by a connecting member straddling a connecting portion will be described. Concave portions S1, at the joints of concrete products B1, B2
Reinforcing bar Q provided with S2 and settled from inside concrete
1, a part of Q2 is exposed, and a concrete product is installed such that the connection surfaces are in contact with each other. Thereafter, the butted rebars Q1 and Q2 are joined by welding at the position of Y, and then the mortar is filled into the recesses and connected. This has been frequently used for connecting concrete products.

In the prior art example 1, when a tensile force S1 acts on a concrete product, a bending moment is generated at the joint by being restrained by bolts, the metal plate bends, and both concrete products are separated. In order to expect high strength in this part, a solid structure is required and the material becomes expensive. Next, in Example 2, welding is very time-consuming and requires skill. In addition, the two concrete products cannot be pressed together.

[0005]

The present invention eliminates the conventional disadvantages, is relatively inexpensive, has a reliable strength, and can be easily determined at the time of designing by a simple structural calculation. To provide concrete product fittings that can be measured and improved in workability.

[0006]

In order to solve the above-mentioned problems, a connecting plate to be embedded in a concrete product is formed into a horseshoe, a semicircle, or a triangle (hereinafter, referred to as a connecting plate), a horseshoe, a semicircle, or a triangle. By combining washers with the connection plate, the tensile force transmitted from the bolt is transmitted uniformly to the cross section of the connection plate, and no bending moment is generated in the connection plate. The strength of the connection plate can be set by examining the cross section of the connection plate using only the pulling force. Also, when manufacturing the connection plate, it can be manufactured by bending flat steel, so the material can be variously selected from iron, stainless steel, etc. In addition, it can be designed to be broken gradually by using iron or the like that has tenacity depending on the material at the time of destruction. Further, since only a compressive force is applied to the washer, a brittle material such as cast iron is used, so that it is easy to ensure safety. In addition, by applying a strong tensile force, the connection does not open when a load is applied to the connection. By making the holes through which the bolts to be opened in the connection plate and the washer are loose holes, the construction is simplified and the workability is improved. Since the bolt connection is used, the material cost is low, and the strength is sufficiently reliable for the examination of strength, so that it can be used easily. As a result, the concrete product can be divided and various shapes can be easily manufactured, so that the cost is reduced and the construction cost is reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, referring to FIGS. 1 to 3, a connection structure and a use state of a first embodiment to which the present invention is applied will be described.

In the drawing, reference numeral 100 denotes a connection fitting according to the first embodiment of the present invention, and a connection plate 10, a semicircular washer 20,
Symbols C1 and C2, which are composed of the bolt 30, the nut 40, and the anchor rebar 60 for fixing the washer 50, indicate concrete products that have been divided and manufactured in advance. First, as shown in FIG. 1, a connecting plate 10 is embedded in advance in a joint portion of concrete C1 and C2 to be connected at the time of manufacturing a concrete product. The connecting plate 10 is fixed to the inside of the concrete product by an anchor bar 60. A recess 70 is provided inside the connection plate 10. Next, the concretes C1 and C2 are aligned at a predetermined position TC. Then, align the semicircular washer 20a with the inside of the connection plate, pass the bolt 30 through the hole 25 with the washer 50a, and connect the nut 40 with the tip of the other washer 50b.
Tighten 0. In many cases, the cores of the screws do not match due to errors in the production of the concretes C1 and C2. In addition, when attaching a large number of connectors to one concrete product,
It is very difficult to engage all screws, but loose holes 15 and 25 in the connection plate and washer
In this way, the error can be absorbed, and the bolt 30 can be tightened, the product can be pulled, pressed and connected. Then, the concave portion 70 is filled with mortar or the like in consideration of effects such as reinforcement of the connecting portion, rust prevention, and prevention of loosening of the bolt. Further, when tensile forces P1 and P2 act on concrete C1C2,
A tensile force is transmitted to the connection plate 10 through the anchor bar 60. This force is evenly transmitted to the semicircular washer 20 as shown in FIG. 3, and no bending occurs in the connecting plate 10. Further, since the washer 20 is restrained by the bolt 30, the washer 20
, A compressive force acts on the bolt 30, and only a tensile force acts on the bolt 30, so that no bending moment is generated on the connecting plate 10. Therefore, if the tensile strength of the bolt 30 and the connecting plate 10 withstands, the concrete C1C2 does not separate.

Next, a second embodiment shown in FIG. 4 will be described. In the figure, reference numeral 200 denotes a connecting fitting according to the second embodiment of the present invention, and D1 and D2 denote concrete products manufactured in advance by division. As shown in FIG. 4, an end of the connection plate 11 embedded in the concrete is bent into a horseshoe shape, and an anchor bar 61 is connected to the anchor bar 61 with the semicircular washer 21 and the nut 41. Since the anchor reinforcing bar 61 is not welded to the connection plate, it can be easily attached between narrow reinforcing bars at the time of concrete production. In addition, by installing the same connection fitting 200 at the other end of the concrete product, the anchor streaks 61 can be fixed even with a short concrete product whose fixing length cannot be obtained.

Next, a third embodiment shown in FIG. 5 will be described. In the figure, reference numeral 300 denotes a connecting fitting according to a third embodiment of the present invention, and E1 and E2 denote concrete products manufactured in advance by dividing. . As shown in FIG. 5, the connection plate has an oval shape and requires welding to manufacture the plate. However, the connection plate is smaller than in the first and second embodiments, which makes it easier to handle. If a connecting plate is also attached to the other end of the product and a tension is applied to the anchor bar in advance by tightening the anchor bolts before placing the concrete, it is effective in preventing cracking of the concrete.

Next, a fourth embodiment shown in FIG. 6 will be described. In the figure, reference numeral 400 denotes the connection fitting 3 described in the third embodiment.
Same as 00. First, concrete product F
Anchor reinforcing bar 6 provided with a concave portion 83 and a screw in F2
3 is buried so that the screw portion is exposed. Then, concrete products F1 and F2 are aligned at a predetermined position TF, and are installed so that anchor reinforcing bars 63 are inserted into holes at both ends of the connection plate 13. Then, a washer 23 is provided. Is passed through an anchor rebar, a washer 53 is attached, and the nut 43 is tightened. Then, the mortar is filled with the mortar.

FIG. 7 shows an example in which the present invention is applied to a culvert block. It is composed of an upper block F1 and a lower block F2, which are manufactured by dividing in advance, and a connection plate is embedded in each block.
00 are interconnected and integrated.

[0013]

As described above, since the connecting fitting of the present invention is constructed as described above, it can be easily connected irrespective of an error in the position at the time of producing the concrete product, and the method of use can be selected according to the intended use. Can be connected by pressure contact, and even if a force is applied from the outside after the connection, the connected state can be maintained without loosening of the connecting portion.

[0014]

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a schematic configuration of a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the connection fitting shown in FIG. 1;

FIG. 3 is an explanatory view of the operation of the connecting fitting shown in FIG. 1;

FIG. 4 is a partial sectional view showing a schematic configuration of a second embodiment of the present invention.

FIG. 5 is a partial sectional view showing a schematic configuration of a third embodiment of the present invention.

FIG. 6 is a partial sectional view showing a schematic configuration of a fourth embodiment of the present invention.

FIG. 7 is a perspective view showing a culvert block to which the present invention is applied.

FIG. 8 is an explanatory view of prior arts 1 and 2.

[Explanation of symbols]

A1, A2 --- Connected precast concrete products B1, B2 --- Connected precast concrete products C1, C2 --- Connected precast concrete products 10, 11, 12, 13 --- Plates 20, 21, 22, 23 ------ Semi-cylindrical washer 30, 31, 32, --- Bolts 40, 41, 42, 43 --- Nuts 50, 51, 52, 53-----Nuts 60, 61, 62, 63------------------------------------------------------------------------------------- ―――― Recess P1, P2 ―――――――― Connection plate b1, b2 ―――――――― Connection bolt and nut R ―――――――― Loose hole Q1, Q2 ―――― ――― Rebar S1, S2 ――――――― Recess T1, T2 --------- External force Y ---

Claims (4)

[Claims] A connecting plate for connecting a concrete product, wherein the connecting plate is processed into a shape in which a bending moment is hardly generated, such as a horseshoe, a semicircle, or a triangle;
A joint fitting for concrete products characterized by connecting both concrete products with bolts and nuts using washers adapted to the shape of the connection plate such as a horseshoe, a semi-column or a triangle. 2. A connection plate in which a portion embedded in the concrete and an anchor are processed into a shape that hardly generates a bending moment such as a horseshoe, a semicircle, or a triangle, and a connection plate such as a horseshoe, a semicolumn, or a triangle. The connection fitting according to claim 1, wherein the connection fitting is fixed by a washer, a bolt, and a nut according to the size of the connection. 3. The shape of the plate is oval, elliptical or
Connection metal fittings in which the connection metal fittings according to claim 1 are welded at their respective ends, such as a rhombus. 4. A method of dividing and manufacturing a secondary concrete product and integrating it using the connecting metal fittings according to claim 1.