JP2006249836A - Insert for concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce time and labor required for tightening a screw markedly and provide loosening prevention effect without requiring a large number of parts and time and labor for mounting. <P>SOLUTION: This insert for concrete has an insert member 11 used by burying or planting it in concrete, a mating member 12 capable of screw-fitting in the insert member 11, and a female screw 13 and a male screw 14 composed of multiple thread screws having a plurality of screw spirals 15, 16 between one pitch formed in the insert member 11 and the mating member 12. This insert has a loosening prevention means due to generation of biting force in a process of screw-fitting of the female screw 13 and the male screw 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an insert including bolts and nuts used by being embedded or planted in concrete.

  As in many other cases, the screw provided in the insert embedded in concrete is constituted by a single thread. There are several reasons for this, but none are definitive. In contrast, single-threaded screws are easy to manufacture and are common, but it takes time and effort to screw in, and it is normal to work with a power tool such as an impact wrench to eliminate it. Yes. For example, it is considered that an anchor portion and a female screw and a male screw of a bolt found in Japanese Patent Application Laid-Open No. 2001-311222 are composed of a single thread, but it is more common not to explain that it is a single thread, and it is so common.

  However, when the insert is set on the formwork with an impact wrench, it is easy to apply extra force, shortening the life of the formwork and sometimes causing an accident. Recently, it was reported that several fatal accidents occurred due to bolting with impact wrench. These accidents occurred in the work of screwing steel bolts into the synthetic resin insert nuts embedded in the concrete using impact wrench, which is considered to be caused by the strong tightening torque of the impact wrench. It is reported that he recommended work by hand. For this reason, manual labor is a problem because it requires a lot of time and labor.

JP 2001-311222 A

  The present invention has been made paying attention to the above points, and the problem is that the time and labor required for tightening the screw are remarkably reduced, and the effect of preventing loosening is exhibited without taking the number of parts and labor of installation. Is to get. Another object of the present invention is to enable a screw tightening operation efficiently and safely with or without an impact wrench.

  In order to solve the above-described problems, the present invention provides an insert member that is embedded or used in concrete, a mating member that can be screwed with the insert member, and a pitch formed between the insert member and the mating member. It has a female screw and a male screw composed of a multi-threaded screw having a plurality of screw spirals, and has means for preventing loosening due to the occurrence of a biting force in the process of screwing of the female screw and the male screw. is doing.

The insert member and the mating member are members that are screwed to each other, for example, a nut and a bolt. It is assumed that the female screw and the male screw formed on the nut and the bolt are formed by a plurality of screw spirals. This is one feature of the configuration. Screws consisting of multiple threads are called multi-threads, and the work of turning to tighten the screws is reduced by a factor of a few. In addition, in the case of a three-thread screw, the necessary screw tightening and loosening work is completed with one-third of the labor. Therefore, the efficiency of the screw tightening operation can be improved without using an impact wrench. But there is also no reason to ban the use of impact wrenches.

Furthermore, the present invention is configured to generate a force in the cross direction with respect to the axis of the screw helix in the process of screwing the female screw and the male screw formed of a multi-thread, thereby providing a locking means. The generation of the force in the cross direction with respect to the axis means that the tightening torque is increased. That is, the present invention intends to solve the problem by reducing the number of times the multi-thread screw is turned for screwing or the like, and adding a configuration of increasing torque by the locking means. For this reason, the room which can also endure the tightening torque by an impact wrench increases.

  As a means for preventing the above-described loosening, at least two screw spirals of the female thread or the male thread are shifted to the left and right, and the female spiral of the female thread is moved in the screwing direction. It is possible to adopt a configuration in which a taper screw whose screw diameter gradually becomes smaller and a multi-threaded male screw are made to coincide with all screw helix axes (see FIG. 1). A multi-thread screw is not connected by only one screw helix, but is made up of multiple screw helixes. At least two (individual) axes of two screw helixes are used. The taper screw is shifted to the left and right (translated), and one of the screw spirals is a tapered screw whose screw diameter gradually becomes smaller in the screwing direction. The multi-threaded screw improves the tightening efficiency of the screw, and by shifting the two axes, a force in the cross direction is generated with respect to the axis of the screw helix. It tends to be crushed and a cleat is formed.

  Further, as a means for preventing loosening, it is possible to adopt a configuration in which a taper screw whose screw diameter gradually becomes smaller in the screwing direction from the female screw introduction port formed of a multi-thread screw (see FIG. 2). This configuration is different from Example 1 in that it does not require a configuration that shifts the axis of the two screw spirals to the left and right, and also differs from the above example in that the taper screw is limited to the female screw side. Yes. By adding such a limitation, it becomes easier to implement, and a force in the cross direction is generated with respect to the axis of the screw helix. It is formed.

  Further, as a means for preventing loosening, a tapered recess is formed on the outside of the female screw introduction port, and a taper convex portion is formed on the base on the male screw side so that a force in the crossing direction is generated by contact between the tapered recess and the convex portion. It is possible to adopt an arrangement in which an eccentric part is formed on either side (see FIG. 3). This configuration differs from Example 1 above in that it does not require a configuration that shifts the axis of the two screw spirals to the left and right, and is consistent with Example 2. In addition, it is different from those in Examples 1 and 2 in that a taper screw is not used, but instead, a taper concave portion is prepared on the female screw side and a taper convex portion is prepared on the male screw side. is there. The taper recess and the taper protrusion have a configuration that causes eccentricity in the contact portion, so that in the final process of screwing, a force in the cross direction is generated with respect to the axis of the screw helix, and the screw gradually increases as the tightening torque increases. The mountain tends to be crushed and a loosening stop is formed.

  Since the present invention is configured and operates as described above, the time and labor required for screw tightening can be remarkably reduced, and it is possible to loosen without increasing the number of parts and mounting effort. The fastening effect can be exhibited, and the screw can be tightened safely and efficiently without using or using an impact wrench.

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 shows an example 1 of a concrete insert 10 composed of an insert member 11 used by being embedded in concrete and a mating member 12 combined therewith. A female screw 13 comprising a double thread having screw spirals 15 and 16 is provided, and the mating member 12 has a male screw 14 that can be screwed into the female screw 13. As for the female screw 13, the axes C and D of the two screw helices 15 and 16 are slightly shifted to the left and right within a range in which the female screw 13 and the male screw 14 can be kept screwed together. Screw helix 16
Is a taper screw whose screw diameter gradually becomes smaller in the screwing direction. The multi-thread thread of the male thread 14 has the same screw helix, and its axis is indicated by E.

  In Example 1 configured as described above, when the male screw 14 is inserted into the female screw 13 from the introduction port and the male screw 14 is rotated with respect to the female screw 13, the threaded state shown in the longitudinal sectional view of FIG. The screwing proceeds in a state in which the axis C of one screw helix 15 of the female screw 13, the center of the axis D of the other screw helix 16, and the axis E of the male screw 14 are the least loaded. As the male screw 14 advances, the thread of the tapered screw constituting the other screw helix 16 and the valleys (1), (2), (3) of the male screw 14 gradually come into contact with each other, and the axis E acting at the time of contact The force in the cross direction gradually increases to (b), (b), and (c). In addition to the axial force of the original bolt, the forces in the cross direction (e) and (f) to the axis Occurring and the tendency of the screw thread to be gradually crushed or the state where the screw thread and the screw valley bite into each other, and the effect of preventing loosening is exhibited.

  FIG. 2 is an example 2 in which an insert member 21 and a mating member 22 are formed as in FIG. 1, and the insert member 21 has a female screw 23 and a mating member 22 has a male screw 24. The female screw 23 and the male screw 24 are two-threaded screws having two threaded spirals 25 and 26 in one pitch, and the threaded spiral of the female thread 23 is a tapered thread whose screw diameter gradually becomes smaller in the screwing direction. In FIG. 2, θ represents an angle at which the diameter of the taper screw is attenuated, and the attenuation starts from a point where several peaks are introduced from the introduction port of the female screw 23. In Example 2 configured as above, when the male screw 24 is inserted into the female screw 23 from the introduction port and the male screw 24 is rotated with respect to the female screw 23, the state shown in the longitudinal sectional view of FIG. The screwing proceeds in a state in which the axis of the female screw 23 and the axis of the male screw 24 coincide with each other, and gradually comes into contact with a mountain valley of the female screw 23 made of a taper screw and a mountain valley of the male screw 24 made of a non-tapered screw. As the pressure increases, the screw thread and the screw valley are in a state of biting into each other, and the screw thread tends to be gradually crushed, thereby exhibiting a loosening prevention effect.

  FIG. 3 is an example 3 of the concrete insert 30 according to the present invention, which includes an insert member 31 having a female screw 33 and a mating member 32 having a male screw 34 that can be screwed thereto. The female screw 33 and the male screw 34 in Example 3 are formed by multiple threads, and as a means for preventing loosening, a tapered concave portion is formed outside the introduction port 37 of the female screw 34, and a conical base portion 38 comprising a tapered convex portion is formed on the male screw side. The eccentric portion is formed so that a force in the crossing direction is generated by the contact between the introduction port 37 and the conical base portion 38. In Example 3, an eccentric portion 39 is formed on a part of the conical base portion 38. Yes. Therefore, as shown in FIG. 3, when the male screw 34 is inserted into the female screw 33 from the introduction port and rotated, the eccentric portion 39 of the conical base portion 38 of the male screw 34 is introduced into the introduction port 37 formed of a taper convex portion on the female screw side. A force in the cross direction with respect to the axis C of the screw spiral is generated in the mating member 32 that is in contact with and screwed into the insert member 31, thereby exhibiting a loosening prevention effect. The same effect can be obtained even if the eccentric portion 39 is provided in the tapered recess on the inlet side.

  FIG. 4 and subsequent figures illustrate specific examples of use of the concrete insert according to the present invention. FIG. 4 shows an insert member 41 according to the present invention to which any one of Examples 1 to 3 described above is applied as an anchor bolt to a concrete 46, and a long mating member 42 is screwed into the insert member 41 in advance. The rocket portion 45 is used, and a male screw 44 portion including a multi-thread screw protrudes from the concrete surface. The male screw 44 is fastened with a multi-thread screw nut 47 that can be screwed into the male screw 44 composed of a multi-thread thread through a hole 48 of an attachment member 49 indicated by an angle. It can be stopped.

  FIG. 5 is a usage example 2 having an insert member 51 and a mating member 52 that can be used for mounting the mounting member 59 in the same manner as in the first example of FIG. 4, and the insert member 51 is embedded in the concrete 56 instead of being retrofitted. The only difference is that the internal thread 53 and the external thread 54 are screwed together, and other configurations are common. FIG. 6 shows an example 3 of use in which the insert member 61 according to the present invention is embedded in concrete 66 and the male screw 64 is screwed into the female screw 63 made of a multi-threaded screw to connect the mating member 62. The mating member 62 is intended to be used as an anchor bolt for casting concrete. In the usage examples 2 and 3, any of the examples 1 to 3 can be applied.

FIG. 7 shows a usage example 4 in which the insert member 71 of FIG. 6 is changed from the embedded type to the retrofitted type, and is similar to the relationship between FIGS. 4 and 5. Both the insert member 71 and the mating member 72 have a female screw 73 and a male screw 74 made of multiple threads, and can be quickly coupled by screwing them. The mating member 72 is used for concrete joining or any other purpose, and a rocket 75 is used for retrofitting. In addition, about the usage examples 1-4, it shows that it is the same structure about the common structure using the code | symbol in which the last 1 digit corresponds, and it treats it generically in description of a code | symbol, and abbreviate | omits description.

  Since the concrete inserts 10, 20, 30, 40, 50, 60, 70 according to the present invention are composed of multiple threads, the time required for screwing is reduced to at least one-half compared to a single thread. Therefore, even in screw tightening work by hand turning work, it is possible to proceed quickly. In addition, when the female screw and the male screw are screwed in, a biting force is generated at the threaded portion, so that the locking means is formed, and the torque gradually increases when the locking means is formed. As in the prior art, a separate locking member is not required, and it is not necessary to install it.

The top view and longitudinal cross-sectional view which show Example 1 of embodiment of the concrete insert which concerns on this invention. The top view and longitudinal cross-sectional view which similarly show Example 2. FIG. Similarly, a longitudinal sectional view showing Example 3. FIG. Sectional drawing which shows the usage example 1 of this invention. Sectional drawing which shows the usage example 2 of this invention. Sectional drawing which shows the usage example 3 of this invention. Sectional drawing which shows the usage example 4 of this invention.

Explanation of symbols

10, 20, 30, 40, 50, 60, 70 Insert 11, 21, 31, 41, 51, 61, 71 Insert member 12, 22, 32, 42, 52, 62, 72 Mating member 13, 23, 33, 43, 53, 63, 73 Female thread 14, 24, 34, 44, 54, 64, 74 Male thread 15, 16, 25, 26 Screw helix 37 Inlet port 38 Conical base 39 Eccentric part 46, 56, 66 76 concrete

Claims (4)

An insert member that is used by being embedded or planted in concrete, a mating member that can be screwed with the insert member, and a multi-threaded screw that has a plurality of screw spirals between one pitch formed on the insert member and the mating member. An insert for concrete having a female screw and a male screw, and having means for preventing loosening caused by a biting force in the process of screwing the female screw and the male screw. As a means to prevent loosening, the screw helix of either the female thread or the male thread is shifted to the left or right, and the screw helix of the female thread is threaded toward the screwing direction. The concrete insert according to claim 1, wherein the taper screw gradually becomes a small diameter, and the multi-threaded male screw has the same screw helix axis. 2. The concrete insert according to claim 1, wherein the loosening-preventing means has a taper screw having a screw diameter that gradually decreases in the screwing direction from the female screw introduction port formed of a multi-thread. As a means to prevent loosening, a tapered recess is formed on the outside of the female screw inlet, and a tapered protrusion is formed on the base on the male screw side, so that a force in the crossing direction is generated by the contact between the tapered recess and the protrusion. The concrete insert according to claim 1, wherein a crab flat portion is formed.

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