JP3027074U - Insert fitting for lifting concrete molded body, concrete molded body using the same, and lifting device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an insert metal fitting for lifting a concrete formed body, which is capable of stably and reliably connecting to concrete. SOLUTION: A lifting insert metal fitting I is formed with a structure in which a flat plate-shaped pull-out resistance member 3 is sandwiched between a long nut member 1 and a bolt member 2. so that can be locked on the lower side of the rebar R _a.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a concrete molded body that enables a lifting operation, and more particularly to a lifting insert metal fitting that is previously embedded in a concrete molded body for connecting a lifting tool, a concrete molded body in which the metal fitting is embedded, and a lifting device. To do.

[0002]

[Prior art]

 For example, concrete gutters (concrete blocks) such as U-shaped gutters, lids, fume pipes, manhole members, etc., which have been preformed in factories, are widely used for road gutters and sewer systems. These concrete compacts are transported from the factory to the site by truck, etc., and installed in the required places. As a matter of course, unloading work on the truck is required. Conventionally, this work has generally been sled work. In other words, a rope or a special head was used, and the concrete molded body was held by a predetermined method and lifted.

These conventional examples will be specifically described below. FIG. 29 is a conventional example of another sling device. FIG. 30 is a diagram showing its usage. As shown in FIG. 30, this sling device is a lifting device exclusively for U-shaped groove concrete blocks, and is called a clamp. FIG. 29A shows a structure in which two substantially S-shaped clamps 100 and 101 are overlapped with each other, and FIG. 29B shows an example of one clamp 118. The clamps 100 and 101 are connected by free connection portions 110, 117, 112 and 119, respectively, so as to be freely rotatable around their connection shafts. Contact portions 103 and 104 are provided at the tips of the clamps 100 and 101, and these serve as a grip portion for the U-shaped groove. The distance between the two grips 103 and 104 depends on the weight of the concrete block to be lifted up. The clamps 100 and 101 are connected with two members at joints 110 and 117, respectively. A hooking member 102 for lifting is provided on the axis of the coupling portion 119. The clamp 118 shown in FIG. 29B has the same structure as either one of the two clamps 100 and 101 shown in FIG. In use, for example, to perform slinging with the device shown in FIG. 29B, two devices 51 and 51 'are prepared, and as shown in FIG. , 107 are pressed and are hung up by the rope 120. At the start of the lifting, the gripping portions 106 and 107 are pressed against both ends of the U-shaped groove to grip the U-shaped groove. Then, the rope is lifted to lift the U-shaped groove. The same applies to the device shown in FIG.

FIG. 31 is a conventional example of another sling device, and FIG. 32 is an example of its use. This device is an enlarged version of the clamp shown in FIG. 29, and is designed to be hung from the inside of the side surface of the U-shaped groove. The apparatus shown in FIG. 31 includes gripping mechanisms 136 and 137 and connecting portions 138 and 139 that directly connect them. The gripping mechanisms 136 and 137 have both side surface grips 130, 132, 131 and 134, and press these inside the side surfaces of the U-shaped groove 201 as shown in FIG. Then, the rope is wound around the hole of the lifting member 135 and lifted. If the U-shaped groove 201 is heavy during lifting, a corresponding pressing force acts on the side surface to lift it. Further, instead of such a slinging device, a method has been proposed in which a lifting insert metal fitting is preliminarily attached to an outer frame having a concrete molded body inside, and a lifting tool is connected to this to lift the metal fitting.

As an insert metal fitting used in this method, for example, a metal fitting in which deformed rebars Fa and Fb as shown in FIGS. 33 (a) and 33 (b) are processed with inner screws Sa and Sb is known. This insert fitting has been proposed not only as an outer frame, but also as a part to be embedded in a concrete molded body without an outer frame. In other words, for concrete moldings, this insert fitting uses pulling strength, that is, resistance to pulling force at the time of hoisting, by using the adhesive force to the concrete that rebar generally has to withstand hoisting. It is intended.

[0006]

[Problems to be solved by the device]

The slinging device of FIG. 29 has a weak gripping force between the gripping portions 103 and 104 and 106 and 107, and is used for lifting a U-shaped groove having a light weight. The slinging device in FIG. 31 presses against the inner side surface of the U-shaped groove, but in general, the U-shaped groove has an inner diameter that is narrow at the bottom side and widens toward the upper side to be an opening hole (φ ₁ <φ ₂ ). When the grip portion was pressed against such an inner side, it could be used only for lifting a U-shaped groove having a light weight as in FIG. 29, because the grip portion opens upward regardless of the strong pressing force. Moreover, it is difficult to completely prevent falling of a block even with a light weight, and there have been some reports of falling accidents during actual lifting. In addition, the slinging device of FIGS. 29 and 30 itself weighs several tens of kilograms, and the slinging preparation work was more difficult than expected. In addition, the weight of the concrete block plus the weight of the slinging device of several tens of kilograms is required even on the hoisting side, resulting in a heavy weight burden. Further, as shown in FIGS. 29 and 30, a lifting device is required for each type of lifting block. Further, these individual hoisting devices are complicated and have a large amount of members as shown in FIGS. 29 and 30, and are expensive. For this reason, the concrete method of lifting concrete blocks, which weigh several tens to hundreds of kilograms, or 2 tons, is the traditional method of hanging ropes over the blocks. Although it is safe to hang it up with a rope, it was necessary to wrap the rope each time and lock it with a key, and work efficiency was poor.

On the other hand, in the insert metal fittings, most of the concrete moldings into which the metal fittings are embedded generally have a thickness of about several cm to 20 cm (in the case of a custom-made block, for example, a tetra pot). (It may have a thickness of about 30 cm.) Therefore, it is not long enough to embed it in the most desirable position for lifting, and the pullout resistance is always sufficient with the general adhesive strength of deformed bar. I can't. That is, it is not possible to stably obtain a reliable bonding force of the insert fitting to the concrete compact. Therefore, it is practically poor except for special concrete compacts. Therefore, in order to have such a defect, the deformed bar is used for an example in which the concrete molded body is not directly lifted up but is driven (embedded) into the wooden frame of the concrete molded body and the concrete molded body is moved together with the wooden frame. Be seen.

Against the background of such circumstances, the inventors of the present application have conducted repeated research in search of a practical insert metal fitting for lifting. As a result, in order to ensure a reliable bondability of the insert fitting to the concrete compact, it is necessary to use another structure instead of the structure that utilizes the concrete bond strength of the reinforcing bar itself. I got the knowledge. Therefore, as a result of diligent research from this point of view, it is most effective to provide the insert fitting with an element that is orthogonal to the direction of the lifting load, especially an element that is orthogonal to the plane, and use the binding force of this element to concrete. It is possible to obtain more reliable binding force more reliably by locking the above element to the reinforcing bar in the case of a reinforced concrete molded body. We obtained the knowledge that

The present invention is based on the above knowledge, and the structure of the hoisting insert metal fitting based on this knowledge is the most easy-to-use form, and moreover, the binding force to the concrete compact is most effectively exhibited. It was obtained by embodying it so that Further, the present invention provides an insert metal fitting that is structurally easy to lift and has an extremely high safety when lifting a concrete molded body, and a concrete molded body in which the insert metal fitting is embedded.

[0010]

[Means for Solving the Problems]

 The present invention is intended to connect a lifting tool having a male screw portion when a reinforced or straight reinforced concrete molded object is lifted up. Of the above-mentioned hoisting tool is provided with a female screw part formed therein and a screwing hole having a female screw part formed therein and extending in the lengthwise direction, from one inlet side (lifting inlet side) of the screwing hole to the inside thereof. A long nut member that can be attached, a threaded portion having a length that can be screwed from the other inlet side of the threaded hole of the long nut member to the inside thereof, a head portion that supports this threaded portion, and a bolt member that includes: It is used by being inserted between the long nut member and the bolt member, and has a large outer shape over part or the entire circumference of the insertion surface, and is attached below the reinforcing bar in concrete. Flat Disclosed is a pull-out resistance member and an insert metal fitting for lifting a concrete formed body.

Further, the present invention provides a hoisting insert metal fitting, which is embedded in advance in a concrete molded body for connecting a hoisting tool having a male screw portion when hoisting a reinforced concrete molded body, and is equivalent to an embedding depth. A screw hole having a length and having a female screw portion formed inside is extended in the length direction, and the male screw portion of the above-mentioned hoisting tool extends from one inlet side (lifting inlet side) of the screw hole to the inside thereof. A long nut member that can be screwed, a threaded portion with a length that can be screwed from the other inlet side of the threaded hole of the long nut member to the inside thereof, and the lengthwise direction of the threaded portion that supports this threaded portion. Disclosed is a rod-shaped portion having a length in the direction perpendicular to the above, a bolt member / resistive member formed of the rod-shaped portion, and an insert fitting for lifting a concrete formed body formed of the rod-shaped portion.

Further, the present invention relates to a hoisting insert metal fitting which is previously embedded in a concrete molded body for connecting a hoisting tool having a male screw part when hoisting a reinforced or unreinforced concrete molded body, and is equivalent to an embedding depth. The length of the male screw part of the above-mentioned lifting tool can be screwed from the lifting inlet side of the screwing hole to the inside of the screwing hole. A nut member and a flat plate shape welded or integrally fixed to the bottom portion of the long nut member and having a large outer shape over a part or the entire circumference of the bottom cross section of the long nut member (or with respect to the length direction of the long nut member. Disclosed is a pull-out resistance member in the form of a rod having a length in the right angle direction, and an insert metal fitting for lifting a concrete molded body, the insert metal member comprising the pull-out resistance member. The present invention also discloses a concrete molded body in which such an insert fitting is embedded, and a method for lifting such a concrete molded body.

In the lifting insert fitting according to the present invention, a pull-out resistance member in the form of a flat plate or a rod, which is sandwiched between the long nut member and the bolt member, is projected from the outer periphery of the long nut member and the Since the binding force is given, a highly reliable binding force can be stably obtained. In addition, since the lifting insert fitting according to the present invention can be disassembled into each member, it has an advantage that it is easy to handle during the distribution process and the storage as a material.

Further, since the insert metal fitting according to the present invention can adjust the substantial total length by adjusting the screwing length of the bolt member to the long nut member, particularly when the pullout resistance member is locked to the reinforcing bar, Even if there is a small difference or variation in the distance between the position of the reinforcing bar in the concrete molded body and the outer surface of the concrete molded body, that is, the level surface of the end surface of the long nut member that is connected to the lifting device, this can be easily handled. It also has the advantage of being easy to use.

It is preferable that the size of the protruding portion of the pull-out resistance member from the outer periphery of the pull-out resistance member in the lifting insert metal fitting as described above be slightly wider depending on the thickness of the reinforcing bar used in the concrete molded body. For safety, it may be about 2 to 5 times. Further, it is preferable that the pull-out resistance member has a shape having rotational symmetry such as a square or a circle, so that the orientation is not limited. Further, the outer peripheral surface of the long nut member is preferably polygonal, for example, hexagonal. By doing so, it is possible to enhance the resistance to the rotational force applied from the lifting device to the long nut member, and further improve the safety.

According to the present invention, in the concrete molded body in which the above-mentioned lifting insert metal fitting is embedded, the reinforcing bar is arranged at a desired lifting position, and the pull-out resistance member is held (locked) on the reinforcing bar. There is. When the pull-out resistance member is locked to the reinforcing bar in this way, the intersection of the vertical reinforcing bar and the horizontal reinforcing bar should be located at the locking position, and the reinforcing bar is held (locked) at this intersection (eg welding). By doing so, the binding force with the concrete molded body can be further strengthened. Further, according to the present invention, it can be used for embedding a solid concrete molding. Further, according to the present invention, since the bolt member is removed and the resistance member is directly welded and fixed to the bottom surface of the long nut member, the thickness of the head portion and the insertion portion of the bolt member becomes unnecessary.

[0017]

[Embodiment of device]

 As shown in FIG. 1, a lifting insert metal fitting according to an embodiment of the present invention is composed of a long nut member 1, a bolt member 2, and a pull-out resistance member 3, and a pull-out resistance member 3 is sandwiched between the long insert member 1 and the bolt member 2. The bolt member 2 is screwed onto the nut member 1 and used by embedding it in the concrete molded body C as shown in FIG. This member 3 can be considered as a kind of washer, but a normal washer has only to be sized so as to intervene between the bolt and the nut so as to connect the two, and a mechanical part may be provided between the bolt and the nut. In an example in which a part of the above is used for fastening, the washer may be of a size that allows these three members to be joined together. On the other hand, the resistance member 3 in the present embodiment has a size larger than such a conventional washer, and has a function of supporting the entire concrete molded body. The size, usage and functions are completely different.

The long nut member 1 is formed to have a predetermined length according to the embedding length of the concrete molding C to be embedded, and the outer peripheral surface thereof has a hexagonal shape. Further, a screwing hole 5 penetrating in the longitudinal direction is provided, and a female screw is formed in the screwing hole 5 over the entire length. For the bolt member 2, a standard commercially available bolt can be used. The bolt member 2 is composed of a male screw portion 2A and a head portion 2B, and the length of the male screw portion 2A may be a length from the lower part of the screw hole 5 to the middle thereof. The pull-out resistance member 3 is formed of, for example, a steel plate of about 2 to 3 mm in the case of a concrete molded body for a general road gutter, and the male portion 2A of the bolt member 2 is passed through the center thereof. Through holes 6 are provided. The outer shape of the member 3 is generally preferably a square shape as shown in the figure, but may be another shape such as a circular shape, if necessary. Further, there may be a rectangular shape having strength in the longitudinal direction.

The length of the screwing hole 5 of the long nut member 1 is {(the length of the male screw portion 2A of the bolt 2) + (the length of the screwing portion Js in FIG. 2) − (the thickness of the resistor 3). } Is preferable. This is because they are completely tightly coupled to each other.

The embedding of such a lifting insert fitting in a reinforced concrete molding is as shown in FIG. Specifically, the pull-out resistance member 3 is locked to the reinforcing bar Ra inside the concrete molded body C from the side opposite to the lifting direction, and in this state, the connection side end surface D of the long nut member 1 is made into the concrete molded body. Try to be flush with the outer surface of C. If the reinforcing bar Ra is taken as an example of the horizontal bar, the locking position is preferably at the intersection with the vertical bar Rb that intersects the horizontal bar.

In addition, in the figure, a connecting metal fitting J of a lifting tool connected to the lifting insert metal fitting I at the time of lifting is also shown. This connecting fitting J is composed of a hand portion (connecting portion) Ja and a screwing portion Js, and the hand portion Ja rotates 90 ° in the back side of the paper and 90 ° in the front side of the paper when viewed from the A side, that is, The structure is such that it can rotate 180 ° independently of the screwing portion Js with respect to the connection surface C. The threaded portion Js has a structure capable of rotating 360 ° with respect to the connecting axis B, that is, a structure capable of rotating 360 ° around the axis B independently of the hand portion Ja. For example, a Freno link bolt A type, which is usually called an omnidirectional eyebolt manufactured by Martec Co., Ltd., is used as a connecting fitting for a lifting tool. Among the A types, the working load of A-10 is 0.5 tons and that of A-16 is 1.5 tons. The threaded portion Js which is the male portion of the long nut member 1 is rotated from the end surface D while being screwed while making use of the function of rotating 360 ° with respect to the connecting shaft B. The screwing stop position is preferably a position where the male screw of the screwing portion Js completely enters the screwing hole 5. After attaching the lifting tool J, wrap a concrete chain around the hand part Ja by winding a crane chain or the like. By using the hoisting tool J shown in FIG. 2 when mounting and hoisting the hoisting tool, it is possible to easily screw the threaded portion Js into the threaded hole 5, and to rotate the connection surface C by 180 °. Since it can be done freely, no undue force is applied during lifting.

According to such hoisting, the insert metal fitting is completely embedded and fixed in the concrete, the safety of hoisting by screwing is extremely high, and there is no intention of dropping. Further, the lifting operation is very simple as compared with the conventional slinging operation, since it is only necessary to screw the lifting tool. In addition, when taking out and removing the cocrete molded body in which the insert metal fitting of the present invention is embedded and removing it several years after the facility is installed, the cap attached to the insert metal fitting can be removed and the lifting metal fitting can be screwed to lift. it can. Assuming this case in advance, it is necessary to prevent the cap that fills the screwed part from easily coming off from the screwed part in the facility of the concrete molded body and in the soil after the facility.

3 to 5 show a typical example of a concrete molded body in which the above-mentioned lifting insert metal fitting is embedded. The embedding position is the surface facing the lifting direction. The concrete molded body shown in FIG. 3 is a lid for a gutter, and a lifting insert metal fitting I is embedded at one place in almost the center thereof. The embedding structure is such that the male screw portion 2A of the bolt 2 is inserted into the resistor 3 through the through hole so that the resistor 3 is completely screwed into the screwing hole 5, and further described with reference to FIG. Similarly, the pull-out resistance member 3 is locked to the reinforcing bar from below at the intersection of the vertical bar Rb and the horizontal bar Ra.

The concrete molded body of FIG. 4 is a U-shaped groove, and the lifting insert metal fitting I is embedded in the bottom of the concrete molded body at the center of gravity position with respect to the left and right. The embedding structure is similar to that described above, in which the pull-out resistance member 3 is locked to the reinforcing bar from below at the intersection of the vertical bar Rb and the horizontal bar Ra. In this case, there are two embedding points in the lengthwise direction of the U-shaped groove. The concrete molded body of FIG. 5 is a fume tube. Also in this case, the lifting insert metal fittings I are embedded at two positions in the length direction. FIG. 6 is a view showing how the U-shaped groove concrete block 10 is lifted. An insert metal fitting I was embedded in the central portion of the U-shaped groove block 10, a lifting tool J was connected to the insert metal fitting I, and the crane 11 was lifted.

Although the male screw portion 2A of the bolt member 2 is supposed to be screwed completely from the lower side of the long nut member 1 with the resistor 3 interposed therebetween, this is not the case. It is also possible to adjust the substantial length by adjusting the screwing length. In particular, when the pull-out resistance member 3 is locked to the reinforcing bar, if there is a large or small thickness (depth) of the concrete molded body, the cover can be formed by adjusting the screwing length of the large or small thickness, and concrete molding. Even if there is some difference or variation in the distance between the position of the reinforcing bar in the body C and the outer surface of the concrete molded body C, that is, the level surface of the end face D on the side of the connection of the long nut member to the lifting tool, It has the advantage of being easy to use and has excellent usability.

The size of the protruding portion of the pull-out resistance member 3 in the lifting insert fitting I from the outer periphery of the long nut member is set to be slightly wider depending on the thickness of the reinforcing bar used in the concrete molded body C. Is preferable, and more safely about 2 to 5 times. Since the pull-out resistance member 3 has a square shape, the pull-out resistance member 3 has a rotationally symmetric shape, so that the orientation is not limited. However, there can be examples of rectangles other than squares, polygons, and circles. Further, although the outer peripheral surface of the long nut member 1 is hexagonal, it may be another polygonal shape. When the hexagonal shape is used, the resistance to the rotational force applied from the lifting device to the long nut member can be increased, and the safety can be further improved.

Next, a method of embedding the insert fitting I will be described. (1) First, the embedding position is determined. For example, in the case of a U-shaped groove, the center position at the bottom as shown in FIG. 4 is selected. There is also an example of selecting two or more positions (example as shown in FIG. 5). The embedding position is obtained in advance depending on the type of concrete molded body. (2) The outer frame is arranged, and the reinforcing bars are arranged in the frame. In particular, at the selected position or near position, the reinforcing bars are arranged so that they intersect vertically and horizontally. (3) Attach the insert metal fitting to the lower side of the reinforcing bar at the selected position. At the time of installation, the insert metal fitting is fixed and locked to the rebar by using wire or spring. Both may be spot welded. When installing at the crossed rebar position of the vertical and horizontal positions, it is sufficient to fix and lock it on the rebar side that the metal fitting contacts. (4) Pour concrete into the form to make a concrete compact. When the concrete is solidified, the insert fitting is embedded and fixed in the molded body. In addition, a vinyl cap is attached to the upper entrance side of the threaded hole 5 of the long nut member of the insert fitting so that foreign matter such as concrete material and dust does not enter the inside from the upper entrance side. . Furthermore, the upper surface of the screwing hole 5 is made to have a relationship (matching the surface) with the upper surface of concrete. By attaching the cap as it is until it is lifted up, it is possible to prevent foreign matter such as rain and sand from entering, and to prevent rust. (5) After fixing the concrete, the frame is removed to obtain a concrete molded body. After moving the concrete molded body with lifting equipment and fixing it to the facility, the cap may be reattached, but there is no particular problem if it is left open without a cap. However, if they look bad or cause damage, they should be buried with screws.

Although an example of a reinforced concrete molded body has been described, a reinforced concrete molded body also exists. As a result of careful experimentation and research on the unreinforced concrete molded body, the present inventor has confirmed that the concrete molded body can be lifted sufficiently safely even when the insert fitting is embedded. Note that it is better to make the outer size of the resistor larger than that of insert metal fittings made of reinforced concrete. In addition, we also conducted an experiment on an example in which reinforced concrete molded bodies were not installed directly below the reinforcing bars but were installed separately. There was no hindrance to lifting. However, also in this case, it is better to increase the outer size of the resistor. In addition, although there are cases of reinforcing bars in only one direction that are not crossed reinforcing bars, they could be lifted without any problems in both cases directly below or separated from the reinforcing bars.

FIG. 7 is a diagram showing another embodiment of the present invention. Figure (a) is an external perspective view, Figure (b) is a side view, and Figure (c) is an actual welded state. In this embodiment, the bolt member 2 is removed, and the rectangular resistance member 30 is fixed to the bottom portion of the long nut member 1 by whole surface welding or the like. In this case, the resistance member 30 is a simple flat plate steel plate having no through hole 6. If welding is performed in advance, the long nut member 1 and the resistance member 30 can be integrated and handled as an insert metal fitting, which is convenient for sale and distribution, and this insert metal fitting should also be installed when embedding in concrete. All that is required is various conveniences. Of course, welding may be performed immediately before embedding concrete in manufacturing a concrete molded body. As shown in FIG. 3C, the welded state is like a state 30A in which the welded portion is melted.

This embodiment is particularly useful when the embedded portion of the concrete molded body has a thin thickness (for example, about 5 cm). That is, in the example as shown in FIG. 1, the bolt member 2 is used for fastening, but the head 2B of the bolt member 2 has a certain height, and an extra thickness corresponding to the height is required. . Therefore, according to the example shown in FIG. 7, since the bolt member 2 is not used, it can be used for a concrete molded body that is thin by the height thereof.

In the insert fitting of FIG. 7, since screwing by a bolt member is not necessary, the screwing hole 5 of the long nut member 1 may have a depth corresponding to the length of the screwing body Js. In this way, the threaded hole 5 does not exist on the bottom side of the long nut member 1, and the entire bottom surface is a hexagonal steel plate surface of the hexagonal long nut member. The surface of the steel sheet is aligned such that the center position of the steel plate is aligned with the center position of the resistor 30, and a contact surface with the resistor 30 is generated over the entire area. ), And a strong bond is established. A coupling strength equivalent to that of the example of FIG. 1 in which the bolt member 2 is provided can be obtained. The outer shape of the resistor 30 is a rectangle, but there are examples of a rectangle, a polyhedron, and a circle. It can also be applied to both reinforcing bars and unreinforced bars.

The following various materials can be used as the materials used in the above respective embodiments. (1), iron material, steel material, (2), aluminum material, stainless steel material, (3), alloy material, super-steel alloy material The male screw in the screw hole is absolutely deformed or damaged by the weight of the concrete compact. Don't Therefore, it is sometimes difficult to form the screw holes, but it is preferable to use a hard metal.

Other Embodiment (1) In the present invention, the long nut member is formed as a member in which the bottom side of the long nut member is widely spread over the entire circumference, and this member is used as it is as an insert fitting. It has the advantage that the insert fitting can be manufactured with one member. There is also an example in which a resistor is attached to the lower part of the skirt portion of (2) and (1) to form an insert fitting. The connection with the skirt part can be stopped by wire, locked by welding, locked by bolts, etc. (3), FIG. 28 is a view (exploded view) showing still another embodiment of the present invention. The bolt member 2 is formed of a male screw portion 2AA, a head portion 2B, and a long rod-shaped portion 2C that is the same material as the male screw portion 2A and that forms an intermediate portion thereof. The long rod-shaped portion 2C has a length which is about 2 to 3 times as long as the male screw portion 2A, and a male screw portion 2A having the same diameter and the same length as the male screw portion 2A of FIG. 1 is formed on the upper portion thereof. In some cases, the thickness of the concrete block exceeds 30 cm. An example is Tetrapot. The length of the male screw part 2A may be the length of the female screw part of the hoisting tool and a margin for adjusting the length slightly added to it, but in such a block, it is necessary to embed the insert fitting deeply to some extent. Needed above. Therefore, the rod-shaped portion 2C having a length corresponding to such a depth is provided. The bolt member 2 has a long rod-shaped portion, but can be obtained by preparing a bolt member and forming a male screw portion of a required length on the upper side of the bolt member. (4) There is an example of a block in which the width of the concrete molded body itself is small. For example, the position where the insert fitting is to be embedded is depth (height) × width × length = L × M × N, and either M or N may have an extremely small value. In such a case, assuming that the resistors 3 and 30 in FIGS. 1 and 7 have a size of width × length = 5 cm × 5 cm, either M or N may be less than 5 cm. With this, the insert metal fitting cannot be completely embedded inside the concrete molded body, and a part of the insert metal fitting is exposed to the outside. Complete embedding is possible if the size of the resistors 3 and 30 is not horizontal x vertical = 5 cm x 5 cm, but a value smaller than M or N, for example 2 cm x 2 cm. The degree of coupling inside (the load that can be lifted) is reduced, which may cause a safety problem. As a countermeasure, firstly, the size of the antibodies 3 and 30 may be rectangular, for example, length × width = 2 cm × 5 cm. However, since the through hole 6 needs to be maintained in the resistor 3 in FIG. 1, there is a problem in terms of safety in reducing the size of the through hole 6 in the vertical or horizontal size. Then, as a second method, with respect to FIG. 1, the resistor 3 is removed, and the head portion 2B is replaced with a rod-shaped body (having a rod shape in either the vertical or horizontal direction) instead of the resistor 3. 7, there is a method of attaching a rod-shaped body instead of the resistor 30 with reference to FIG. 34A and 34B are examples in which the head portion 2B is the rod-shaped body 2BB, and FIG. 34A is a diagram corresponding to FIG. 1 and FIG. 34 (c) is a view corresponding to FIG. 7, and the rod-shaped portion 3BB and the long nut member 1 form an insert fitting. In order to obtain the shapes shown in FIGS. 34 (a), (b), and (c), integration by welding or various methods such as cutting out materials as shown in FIGS. 34 (a), (b), and (c) Exists in. Such a rod-shaped body is formed by embedding the longitudinal direction of the rod-shaped body in the longitudinal direction of either the vertical direction or the horizontal direction of the concrete formed body. By doing so, it becomes possible to completely embed the insert metal in the concrete molded body having a smaller value in either the vertical or horizontal direction, without exposing the insert fitting to the outside. By increasing the length of the rod-shaped body in the longitudinal direction, safety and the degree of coupling can be further improved. There are hexagonal shapes, quadrangular shapes, circular shapes, etc. as the shape of the rod-shaped body. (5) Alternatively, the resistors 3 and 30 may be provided in two or more stages. In the example of the resistor 3 of FIG. 1, there are firstly a method of stacking two resistors 3 and secondly a method of welding one resistor to the lower portion of the head portion 2B. With respect to FIG. 28, the resistor 3 is embedded so as to overlap the head portion 2B, but there is a method in which the second resistor is fixed to the lower end portion of the male screw portion 2AA and this is embedded as it is. The application to FIG. 28 has the advantage of improving the safety and the degree of coupling because the rod-shaped portion 2C is long.

A working cost comparison with a conventional example (sliding work with a wire) when the insert fitting according to the embodiment of FIG. 1 is used is shown below. (1) Hume tube B type 300 (Fig. 8) This fume tube is muscular and weighs 165 kg. The metal fittings were embedded in the fume tube at two points P ₁ and P ₂ to perform lifting work. The comparison is shown in FIG. Here, how to read the comparison diagram of FIG. 9 will be described. A length of 2000 mm per piece is the length of a Hume tube, and "per 10 meters" is a comparison with five fume tubes. The “caretaker” is what is called a “side dish” for so-called work, and means that the data concerning this caretaker was consumed for 0.3 to 0.3 hours. 6,030 ... 0.3 hours is equivalent to 6,030 yen. 0.225 means that 0.225 hours have been consumed. 4,523 ... 0.225 hours is equivalent to 4,523 yen. 1,508: It means that the cost difference between the conventional example and this insert fitting is 1,508 yen.

The other data are based on the same idea. The consumption time (and cost) for this insert is estimated to be considerably larger than it actually is. This is because it was taken from the perspective of performing work on top of safety, and it is clarified that if work is performed on the same scale of safety as before, it will be about one-third of each value. . That is, this insert metal fitting is roughly divided into three types: work for embedding concrete, work for screwing a lifting device at the time of lifting, and work for lifting. With the conventional rope type, there is no work for embedding concrete and screwing work, but these two work amounts with this insert fitting are extremely small. On the other hand, the rope type requires an extra work to lock the rope to the concrete by myself and the key, and this work amount is extremely large. Furthermore, with the rope type, the work of removing the rope after lifting it up is added. With this insert, there is almost no work required for such a rope. As can be seen from these comparisons, this insert fitting has the advantage of being extremely large and reducing the amount of work compared to the rope type. (2) Retaining wall H800 (FIG. 10) This retaining wall is plain and weighs 596 kg. It has an L-shape. An insert metal fitting was embedded in the retaining wall at two points P ₃ and P ₄ on the inner surface on the bottom side and one point P ₅ on the inner surface on the wall side to perform lifting work. The comparison is shown in FIG. (3), U-shaped groove lid ISL300 (FIG. 12) This lid is muscular and weighs 132 kg. An insert metal fitting was embedded in one point at the central position P ₆ and lifting work was performed. The comparison is shown in FIG. (4) Hume tube B type 600 (Fig. 14) The fume tube is muscular and weighs 660 kg. An insert metal fitting was embedded in the fume tube at two points, P ₇ and P ₈ , and a lifting operation was performed. The comparison is shown in FIG. (5), U-shaped groove KDS-30 * 60 (FIG. 16) This U-shaped groove is reinforced and has a weight of 634 kg. Inserting metal fittings were embedded in the two points P ₉ and P ₁₀ on the inner side of the bottom of the U-shaped groove, and the lifting operation was performed. The comparison is shown in FIG. (6), U-shaped groove KDS-30 * 100 (FIG. 18) This U-shaped groove is reinforced and weighs 1070 kg. Insert metal fittings were embedded in the two points P ₁₁ and P ₁₂ on the inner side of the bottom of the U-shaped groove, and the lifting operation was performed. The comparison is shown in FIG. (7) Box side groove B-CAT30 * 30 * 2000 (FIG. 20) This box side groove is reinforced and has a weight of 540 kg. Insert metal fittings were embedded in two points P ₁₃ and P ₁₄ on the upper surface of the top of the box side groove, and lifting work was performed. The comparison is shown in FIG. (8), NWL wiper (falling lid type) 600 * 600T-20 (FIG. 22) This wiper is muscular and weighs 1288 kg. Insert metal fittings were embedded in the two points P ₁₅ and P ₁₆ on the inner side of the bottom of the winder to perform lifting work. The comparison is shown in FIG. (9) Pedestrian Boundary Block LE with Concrete Foundation (Fig. 24) This block is a curb used for a so-called boundary between a sidewalk and a roadway, and is unreinforced and weighs 668 kg. An insert metal fitting was embedded in this block at two points in the intersecting direction of P ₁₇ and P ₁₈ , and lifting work was performed. The comparison is shown in FIG. (10), Water collecting basin 400 * 4000 (with grating) (Fig. 26) This block is unreinforced and weighs 800 kg. Two points P ₁₉ and P ₂₀ were embedded with insert metal fittings and lifted. The comparison is shown in FIG.

Regarding Standardization As can be seen from the above comparison, the insert fitting of the present invention has a simple structure, but its practical value is extremely high. The applicant has applied for the sling using such an insert fitting to be adopted in the civil engineering standards of Ibaraki Prefecture, and feels that the possibility of adoption is extremely high. The civil engineering standards of Ibaraki Prefecture are very similar to those of the Ministry of Construction, and we are preparing to apply for the civil engineering standards of the Ministry of Construction in addition to the civil engineering standards of Ibaraki Prefecture. In addition, in such standardization, it is natural to consider accidents such as dropping, and it was said that almost no concrete blocks dropped in the experiments and examinations by the applicant and the examination by the Civil Engineering Division of Ibaraki Prefecture. is there.

[0037]

[Effect of device]

 As described above, according to the present invention, it is possible to enhance the certainty of the bonding force of the insert metal fittings for lifting, which facilitates the lifting work of the concrete molded body, to the concrete molded body, and to make the concrete molded body stable. It can contribute to the improvement of workability of handling work. Further, since the insert fitting of the present invention is completely embedded inside the concrete molded body, there is no problem in terms of external shape after the facility of the concrete molded body.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a lifting insert fitting according to an embodiment.

FIG. 2 is a partial cross-sectional view showing a state in which the lifting insert fitting of FIG. 1 is embedded in a concrete molded body.

FIG. 3 is a plan view of a concrete molded body according to an embodiment of the present invention including a partial fracture.

FIG. 4 is a cross-sectional view of a concrete formed body according to another embodiment of the present invention.

FIG. 5 is a plan view of a concrete formed body according to still another embodiment of the present invention.

6 is a concrete U-shaped groove lifting example of the present invention. FIG.

FIG. 7 is a view showing another insert fitting of the present invention.

FIG. 8 is a view showing an example of embedding the insert fitting of the present invention.

FIG. 9 is a comparison diagram with a conventional example.

FIG. 10 is a view showing an example of embedding the insert fitting of the present invention.

FIG. 11 is a comparison diagram with a conventional example.

FIG. 12 is a view showing an example of embedding the insert fitting of the present invention.

FIG. 13 is a comparison diagram with a conventional example.

FIG. 14 is a view showing an example of embedding the insert fitting of the present invention.

FIG. 15 is a comparison diagram with a conventional example.

FIG. 16 is a view showing an embedding example of the insert fitting of the present invention.

FIG. 17 is a comparison diagram with a conventional example.

FIG. 18 is a view showing an embedding example of the insert fitting of the present invention.

FIG. 19 is a comparison diagram with a conventional example.

FIG. 20 is a view showing an embedding example of the insert fitting of the present invention.

FIG. 21 is a comparison diagram with a conventional example.

FIG. 22 is a view showing an embedding example of the insert fitting of the present invention.

FIG. 23 is a comparison diagram with a conventional example.

FIG. 24 is a view showing an embedding example of the insert fitting of the present invention.

FIG. 25 is a comparison diagram with a conventional example.

FIG. 26 is a view showing an embedding example of the insert fitting of the present invention.

FIG. 27 is a comparison diagram with a conventional example.

FIG. 28 is a view showing an embodiment of another insert fitting of the present invention.

FIG. 29 is a view showing a conventional sling device.

FIG. 30 is a diagram showing a usage example of the apparatus of FIG.

FIG. 31 is a view showing another conventional sling device.

32 is a diagram showing an example of use of the device in FIG.

FIG. 33 is a perspective view of a conventional insert fitting.

FIG. 34 is a partial embodiment view of another insert fitting of the present invention.

[Explanation of symbols]

 1 Long nut member 2 Bolt member 3 Pull-out resistance member 5 Screw hole 6 Through hole

Claims (17)

[Scope of utility model registration request] 1. A hoisting insert metal fitting, which is previously embedded in a concrete molded body for connecting a hoisting tool having a male screw portion when hoisting a reinforced concrete molded body, has a length corresponding to an embedding depth, In addition, a threaded hole having an internally threaded portion formed therein is extended in the lengthwise direction, and a long nut to which the male threaded portion of the lifting tool can be screwed from one inlet side (lifting inlet side) of the screwing hole to the inside thereof. Member, a screw member having a length capable of being screwed from the other inlet side of the screwing hole of the long nut member to the inside thereof, a head portion supporting the screw part, a bolt member, and a long nut member. A flat plate-shaped pull-out resistance that is used by being inserted into a bolt member and has a larger outer shape over part or the entire circumference than the insertion surface and is attached to the lower side of the reinforcing bar in concrete. Department Insert metal fittings for lifting concrete compacts made of materials. 2. The hoisting method according to claim 1, wherein a pulling resistance member is held under a reinforcing bar located at one or more hoisting positions in a reinforced concrete molded body capable of hoisting operation. A concrete molded body characterized by embedding insert metal fittings. 3. The concrete formed body according to claim 2, wherein the pulling resistance member and the reinforcing bar are welded or temporarily locked to each other when the reinforcing bar is held at the intersection. 4. A hoisting insert metal fitting, which is previously embedded in a concrete molded body for connecting a hoisting tool having a male screw portion when hoisting a non-reinforced or reinforced concrete molded body, has a length corresponding to an embedding depth. A long nut member capable of being screwed to the male screw portion of the lifting tool from the lifting inlet side of the screw hole to the inside thereof. A bolt member having a screw portion having a length capable of being screwed from the other inlet side of the screwing hole of the long nut member to the inside thereof, a head portion supporting the screw portion, a long nut member and a bolt member. A lifting insert metal fitting, comprising a flat plate-shaped pull-out resistance member that is used by being inserted between the two and has a larger outer shape over a part or the entire circumference of the insertion surface. 5. A hoisting insert metal fitting according to claim 4, wherein a pull-out resistance member is locked at one or more hoisting-equivalent positions in an unreinforced or reinforced concrete molded body capable of hoisting operation. Concrete molding characterized by being embedded. 6. The pull-out resistance member has a through hole through which a threaded portion of a bolt member can be inserted and which is smaller than the outer shape of the head and the outer shape of the long nut member, and the outer shape of the head of the bolt member and the long nut. The insert metal fitting for lifting a concrete formed body according to claim 1 or 4, wherein the shape is a flat plate-like member having an outer shape that is larger than a part of the outer shape of the member or around the entire circumference. 7. A hoisting insert metal fitting, which is previously embedded in a concrete molded body for connection of a hoisting tool having a male screw portion when hoisting a reinforced concrete molded body, has a length corresponding to an embedding depth, In addition, a threaded hole having an internally threaded portion formed therein is extended in the lengthwise direction, and a long nut to which the male threaded portion of the lifting tool can be screwed from one inlet side (lifting inlet side) of the screwing hole to the inside thereof. Member, a threaded portion having a length capable of being screwed from the other inlet side of the threaded hole of the long nut member to the inside thereof, and supporting this threaded portion,
An insert metal fitting for lifting a concrete formed body, comprising: a rod-shaped portion having a length in a direction perpendicular to the lengthwise direction of the screw portion; 8. A reinforced concrete molded body which enables a lifting operation, in a state in which a rod-shaped portion is held under a reinforcing bar located at one or a plurality of positions corresponding to the lifting.
A concrete molded body in which the lifting insert metal fitting described in is embedded. 9. The concrete molded body according to claim 8, wherein the holding at the intersection of the reinforcing bars is carried out by welding or temporarily locking the rod-shaped part and the reinforcing bars. 10. A hoisting insert metal fitting, which is embedded in advance in a concrete molded body for connecting a hoist having a male screw portion when hoisting a reinforced or unreinforced concrete molded body, has a length corresponding to an embedding depth. A long nut member capable of being screwed to the male screw portion of the lifting tool from the lifting inlet side of the screwing hole to the inside thereof. It is welded or integrally fixed to the bottom of the long nut member, and has a flat outer shape that is larger than the bottom cross section of the long nut member over a part or the entire circumference (or a length perpendicular to the length direction of the long nut member. An insert metal fitting for lifting a concrete molded body, which comprises a pull-out resistance member in the shape of a bar). 11. The concrete molding lifting insert according to claim 10, wherein the long nut member has a screwing hole halfway in the depth direction, and the bottom of the long nut member is a flat surface having no hole. Metal fittings. 12. The lifting insert fitting according to claim 1, 4 or 6 or 7 or 10 or 11, wherein the outer peripheral surface of the long nut member is polygonal. 13. A reinforced or unreinforced concrete molded body which enables a lifting operation, wherein the lifting insert metal fitting according to claim 7 or 10 is embedded at one or a plurality of positions corresponding to the lifting. And a concrete molded body. 14. A concrete molded body lifting device for lifting the concrete molded body according to claim 2, 5 or 8 or 13 with a lifting tool having a male screw part, wherein the male threaded part of the lifting tool is a long nut of an insert fitting. A concrete molded object lifting device, in which a female threaded portion is screwed from a lifting inlet side of a screwing hole of a member, and the concrete molded object is lifted by a lifting tool after the screwing. 15. The concrete formed body according to claim 2, 5 or 8 or 13, wherein the one or more lifting positions is a position on a surface facing directly above the formed body. . 16. The concrete forming body according to claim 2, 5 or 8 or 13, wherein when embedding in concrete, a cap for preventing foreign matters is attached to the lifting inlet side of the screwing hole of the long nut member, and lifting is performed. A concrete molded body that is intended to fill and close this screw hole when fixing it later. 17. A male screw portion capable of rotating 360 ° with respect to a connecting shaft with the concrete molded body according to claim 2, 5 or 8 or 13, and supporting the male screw portion from the surroundings and independently connecting to the male screw portion. In a device for hoisting a concrete formed body by a hoisting tool having a connection part rotatable by 180 ° with respect to a surface, a male screw part of the hoisting tool is screwed from a hoisting inlet side of a screwing hole of a long nut member of an insert fitting to a female thread part. A device for hoisting a concrete formed body, which is made to be joined together and then the concrete formed body is hoisted by a hoisting tool after the screwing.