JPH0685483U - Insert bush - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the insert bushing from being pulled out when suspending concrete products. [Structure] A flange having a plurality of ribs projecting axially from the outer circumference of a bush body 1 formed into a bottomed tubular shape, and a rim projecting to the opening side at the closed end of the bush body 1. Is formed so as to project in the outer peripheral direction, and a plurality of protruding rods are provided so as to project in the axial direction, and the length of each protruding rod is set to be the same as the wall thickness of the embedding position of the concrete product by matching the length of the bush body 1. Then, the stress generated in the bush main body 1 is dispersed by the retaining function of the ribs, flanges, and projecting rods of each part.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an insert bush that is pre-embedded in a concrete product in order to screw a hanging fitting to a concrete product such as a U-shaped groove.

[0002]

[Prior art]

 Conventionally, in a concrete product such as a U-shaped groove, a substantially cylindrical insert bush is fixed at a fixed position of the hanging metal fitting in order to fixedly support the hanging metal fitting for hanging a wire rope for hanging. It is buried in advance so that the opening is exposed on the outer surface of the side wall.When transporting concrete products or laying on site, wire rope is hooked to the hanging metal fitting inserted from the opening of the insert bush by the crane. They were working by suspending and moving concrete products.

However, since the insert bush simply has a cylindrical shape, if excessive stress concentrates in the vicinity of the insert bush in the concrete product during suspension of the concrete product, the stress will be reduced. Since it could not be dispersed, the concrete product suffered damage such as cracking and chipping, and there was a risk that the insert bush would come off and cause an accident.

[0004]

[Problems to be solved by the device]

 The present invention does not provide an insert bushing for suspending a concrete product such as a U-shaped groove so as to disperse the stress generated in the insert bushing and prevent the concrete product from coming off so that the product can be safely suspended. To do.

[0005]

[Means for Solving the Problems]

 In view of the problem of dispersing the stress generated in the insert bush when suspending a concrete product based on the above-mentioned conventional technique, the present invention forms a bush main body in a cylindrical shape with a bottom and places it at predetermined intervals on the outer circumference of the bush main body. In addition, a plurality of ribs are formed so as to project in the axial direction, and a flange that projects the rim toward the opening is formed at the closed end of the bushing body so as to project toward the outer periphery. However, by providing an insert bush in which the length of the projecting rod is set to be the same as the wall thickness of the embedded position of the concrete product by matching the length of the bush body, each part of the bush body having a retaining function is provided. The ribs, flanges, and projecting rods described above solve the above drawbacks by dispersing the stress generated in the bush body.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a bush body made of synthetic resin and having a cylindrical shape with a bottom. The bush body 1 has a body portion 2 formed in a substantially cylindrical shape. A cylindrical taper portion 3 is formed at one end of the body portion 2 so as to taper continuously therefrom, and the other end of the body portion 2 is closed to form a closed end portion 4.

Further, the inside of the bush main body 1 is formed with an inner circumference of the tapered portion 3 from the opening 5 to the body portion 2 having the same diameter to form a receiving portion 6, and the receiving portion 6 has The inner diameter of the continuous body portion 2 is reduced and a female screw portion 7 is engraved to reach the closed end portion 4.

Reference numeral 8 denotes a rib formed on the outer periphery of the body 2 at predetermined intervals and projectingly formed in the axial direction. The rib 8 is gradually tapered toward the closed end 4 in a tapered shape. There is.

Reference numeral 9 denotes a flange formed so as to radially expand in the outer peripheral direction of the closed end portion 4. An annular rim 10 is integrally formed at the peripheral portion of the flange 9 toward the opening 5 side. ing.

Reference numeral 11 denotes a plurality of projecting rods projecting from the closed end portion 4 rearward in the axial direction. The projecting rods 11 are formed to have the same length, and the length of the projecting rods 11 is the body portion 2. The length of the bush body 1 including the tapered portion 3 is set to be the same as the wall thickness of the burying position of the concrete product W, and the length of the projecting rod 10 depends on the burying position of the concrete product W. The size is appropriately selected.

Further, although the protruding rod 11 is shown as protruding at a position corresponding to the apex of an equilateral triangle having the center of the closed end 4 as the center of gravity, the number and the protruding position are not limited to this.

Reference numeral 12 denotes a formwork of the concrete product W, which is provided so as to be openable and closable with respect to the fixed-side formwork 12a, and fixed at a predetermined position of the formwork 12 made of synthetic resin. Tool 13 is provided.

The fixture 13 forms a substantially hemispherical engaging portion 14 having a diameter slightly larger than the receiving portion 6 of the bush body 1, and a screw bar is formed at the center of the flat portion 15 of the engaging portion 14. A nut 16 is screwed onto the screw rod 16 by projecting the screw rod 16 and penetrating the screw rod 16 into a through hole 17 provided at a predetermined position of the mold 12.

Next, the operation of the insert bush according to the present invention will be described. First, in order to embed the bush body 1 in the concrete product W, the engaging portion 14 of the fixture 13 projecting from the inner surface of the form 12 is provided. The bush 5 is fitted into the receiving portion 6 of the bush body 1 and the end surface of the opening 5 of the bush body 1 is brought into close contact with the inner side surface of the mold 12.

The fitting process of the engaging portion 14 will be described. The engaging portion 14 is set to have a diameter slightly larger than that of the receiving portion 6, but the receiving portion is elastically reduced due to its material characteristics. 6, the bush body 1 is elastically fitted and fixed to the engaging portion 14 by pressing the peripheral surface of the receiving portion 6 by the elastic force of the engaging portion 14 in the receiving portion 6.

Next, when the formwork 12 is closed with respect to the fixed-side formwork 12a, the total length of the bush body 1 and the projecting rod 10 is equal to the wall thickness of the embedding position of the concrete product W. The tip of 11 comes into contact with the mold 12a, and in this state cement is poured into the molds 12 and 12a. After the cement is cured and solidified, the mold 12a is rotated to move the engaging portion 14 from the receiving portion 6 When detached, the end surface of the opening 5 of the bush body 1 is exposed flush with the side wall W1 of the concrete product W, and the bush body 1 is embedded at a predetermined position in the concrete product W.

When suspending the concrete product W, a shaft of a suspending metal fitting (not shown) is screwed onto the female screw portion 7 of the bush body 1, and the shuffle is rotatably mounted on the shaft. A wire rope is hooked on the concrete, and the wire rope is hooked by a crane so that the concrete product W can be hung and moved.

[0018]

[Effect of device]

 In short, according to the present invention, the bush main body 1 is formed into a cylindrical shape with a bottom, a plurality of ribs 8 are formed on the outer circumference of the bush main body 1 at predetermined intervals and project in the axial direction, and the closed end portion of the bush main body 1 is formed. The rim 10 has a flange 9 projecting outwardly from the opening 5, and a plurality of projecting rods 11 project axially. The length of each projecting rod 11 is different from that of the bush body 1. Since the ribs 8 project in a tapered shape around the bush body 1 because the ribs 8 have a taper shape and are set to have the same thickness as the embedding position of the concrete product W, the hooking action in the rotating direction and the pulling direction is achieved. Since the flange 9 has a hook-shaped cross section in which the rim 10 projects toward the opening 5, it has a hooking action in the pulling direction, and the projecting rod 11 projects rearward from the closed end 4 so that it can be rotated respectively. Each part of the bush body 1 has a hooking action in the moving direction. With the retaining function of the concrete product W, it is possible to disperse the stress generated around the bush body 1 when the concrete product W is hung, so that there is no damage such as cracks or chips near the embedded position of the bush body 1, and the concrete product W is not damaged. The strength of the bush can be stabilized, and the bush body 1 can be prevented from slipping out of the concrete product being suspended and moved, so that safe work can be performed.

Further, since the length of the projecting rod 11 is configured to be the same as the wall thickness of the concrete product W at the burying position together with the bush body 1, the length of the projecting rod 10 is the longest in the concrete product W. It is possible to increase the adhesion area with the concrete and maximize the retaining function of the bush body 1 by the hooking action in the rotating direction. For the embedding operation, the bush body 1 is elastically fitted and fixed to the engaging portion 14 of the fixture 13 provided on the form 12, and the end surface of the opening 5 of the bush body 1 is closely attached to the inner surface of the form 12. Since the mold 12 is rotated and closed with respect to the fixed mold 12a, the tip of the protruding rod 11 comes into contact with the mold 12a, and as a result, the bush main body 1 keeps the space between the molds 12 and 12a. It can be held and the bush main body 1 can be axially moved by the molds 12 and 12a. Since the bush main body 1 is pressed by, it is possible to firmly and firmly maintain the fixed state in the embedded position.

Further, since the engaging portion 14 of the fixture 13 in which the bush body 1 is elastically fitted and fixed is formed in a spherical shape, for example, when the engaging portion has a cylindrical shape, this has a cross section. Due to the rectangular shape, when the mold 12 is rotated to the open side at the time of demolding, the corner portion of the engaging portion is caught in the receiving portion 6 of the bush body 1, and the mold 12 is rotated to the open side. It is not possible to remove the hinge part of the molds 12 and 12a.However, since the engaging part 14 of the fixture 13 is spherical and has an arcuate cross section, the mold 12 cannot be rotated to the open side. In the operation, the engaging portion 14 can be smoothly disengaged from the receiving portion 6 without being caught on the peripheral surface of the receiving portion 6, and the demolding work can be easily performed. is there.

[Brief description of drawings]

FIG. 1 is a front view of an insert bush according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a left side view of FIG.

FIG. 4 is a right side view of FIG.

5 is a sectional view taken along line AA of FIG.

FIG. 6 is a cross-sectional view showing an embedded state of an insert bush according to the present invention.

FIG. 7 is a cross-sectional view showing a demolding operation of a concrete product.

FIG. 8 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 1 Bush main body 4 Closed end 5 Opening 8 Rib 9 Flange 10 Rim 11 Projection bar W Concrete product

Claims (1)

[Scope of utility model registration request] 1. A bush body is formed in a cylindrical shape with a bottom, a plurality of ribs are formed on the outer circumference of the bush body at predetermined intervals and project in the axial direction, and a rim is opened at the closed end of the bush body. A flange protruding toward the side is formed to project in the outer peripheral direction, and a plurality of protruding rods are provided so as to protrude in the axial direction, and each length of the protruding rods matches the length of the bush main body and is the meat at the embedded position of the concrete product. Insert bush characterized by being set to the same thickness.