JPH0516406Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an implantation structure for an embedded screw to be implanted in a hole having an enlarged diameter hole called an undercut deep inside.

(Prior Art) In order to attach a structure to an object to be fixed, for example, solidified concrete, a method has been implemented in which anchor bolts or embedded screws are installed in the concrete and used.

As mentioned above, the present applicant has already developed several structures in which a hole with an enlarged diameter hole is drilled deep inside the object to be fixed, and an embedded screw is implanted into this hole to prevent it from coming out. Suggestions have been made.

FIG. 7 is a perspective view of a conventionally used embedded screw.

This embedded screw consists of a screw body 1 which has a tapered surface 4 formed in a downwardly expanding shape on an overhanging jaw 3 connected to the lower part of a bolt body 2, and a screw body 1 which is cut from the lower end surface leaving a thin connecting part at the upper end. The deployment sleeve 5 has a plurality of deployment pieces 6 formed by slits, and the sleeve body 7 has a cylindrical shape and has internal threads 8 and 9 at both ends of a hollow hole, and a driver engagement groove 10 on the outer end surface. As shown in FIG.
is inserted and its overhanging jaw 3 faces the enlarged diameter hole C,
Next, the deployment sleeve 5 is loosely inserted into the bolt body 2 and placed on the tapered surface 4, and each of the deployment sleeves 5 is hammered using a separately prepared driving cylinder having approximately the same diameter as the deployment sleeve 5. The deployable piece 6 is deployed on the tapered surface 4, and then the sleeve body 7 is screwed into the bolt body 2 using a screwdriver to fix it, and the bolt E is screwed in using the upper internal thread 8 of the sleeve body 7 as an embedded screw. It is used for attaching structure D.

(Problem to be solved by the invention) By the way, from the above-mentioned embedded screw implantation structure, there is no deployment sleeve 5 on the wall surface of the enlarged diameter hole C.
Only each expanded piece 6 is strongly crimped and receives the load from the structure D side, and since there is a gap between the embedded screw and the hole wall, the structure D after being attached to the structure For example, when the structure D vibrates, this movement is transmitted to the deployable sleeve 5 which is strongly pressed against the wall surface of the enlarged diameter hole C, causing the wall surface of the enlarged diameter hole C to wear down over time. The wear and tear on the wall surface of the enlarged diameter hole C gradually moves from the upper end of the enlarged diameter hole C to the wall surface of the hole B section, and progresses toward the hole opening.
If this happens, the installation strength of the embedded screw gradually decreases, and the attachment of the structure D becomes loose, which impairs the reliability of the embedded screw.

This idea was created in view of the above points, and aims to suppress the wear and collapse of the wall surface of the enlarged diameter hole, reduce the decrease in the embedded screw installation strength, and provide a highly reliable embedded screw installation structure. The purpose is to

(Means for Solving the Problems) The gist of this invention to achieve the above object is to include a screw body having a tapered surface at the bottom, a deployable sleeve that is loosely inserted into the screw body, and a sleeve that is screwed into the screw body. In the embedded screw implantation structure, the sleeve body is combined with the sleeve body to be implanted, and the deployable sleeve is deployed into the enlarged diameter hole formed deep inside the hole to be implanted to prevent the sleeve from slipping out. This embedded screw implantation structure is characterized in that a variable diameter sealing member is disposed between the sleeve body and the deployable sleeve, the diameter of which is increased to close the gap between the hole walls near the enlarged diameter hole.

(Function) According to the invention configured as described above, when the device is installed in a hole having an enlarged diameter hole, the gap between the hole walls near the enlarged diameter hole is sealed by the sealing member. The movement of the embedded screw in the direction of eccentricity within the hole is restricted, and wear and tear of the enlarged diameter hole due to the movement of the deployable sleeve which is strongly pressed against the wall of the enlarged diameter hole is reduced. Moreover, the debris generated when the wall surface of the enlarged diameter hole collapses due to wear and tear cannot escape from the enlarged diameter hole and is confined within the enlarged diameter hole, which acts as a resistance against the further progress of wear and collapse of the wall surface of the enlarged diameter hole. , reducing the decline in the implantation strength of embedded screws over time.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing how this invention is used;
FIG. 2 is a perspective view of the sealing member.

The same reference numerals are used for parts common or equivalent to those in FIG.

In this invention, in the embedded screw formed by combining the screw body 1, the deployment sleeve 5, and the sleeve body 7, between the sleeve body 7 and the deployment sleeve 5,
A variable diameter blocking member 11 whose diameter is increased by screwing the sleeve body 7 into the screw body 1 is provided.

In its normal state, the sealing member 11 has a cylindrical shape with approximately the same diameter as the sleeve main body 7, and is provided with vertically divided cracks 12 for changing the diameter, and the inner surface thereof has a diameter that expands toward the top. It is formed on the tapered surface 13, and
The lower end of the sleeve body 7 is formed into a tapered surface 14 that matches the tapered surface 13 of the sealing member 11 in order to press fit into the sealing member 11 and change its diameter.

Incidentally, when changing the diameter of the sealing member 11, the lower end portion of the sealing member 11 is made to enter approximately to the vicinity of the lower end portion of the sealing member 11 in order to achieve uniform diameter change as a whole.

Further, it is preferable that the cracks 12 of the sealing member 11 have a structure in which the cracks 12 in the normal state are overlapped without a step difference, as shown in FIG. 3, so as not to create a gap after the diameter change.

The sealing member 11 can be implemented in various forms other than the above-mentioned embodiment (first embodiment).
The basic structure of the sealing member of the second embodiment shown in FIG. Tapered surface 15 whose diameter expands outward
a, 15b, and this lower mouth side tapered surface 15b
An auxiliary ring 16 whose outer surface has a tapered surface 17 whose diameter expands downward is arranged in advance between the deployable sleeve 5 and the sleeve body 7, and when the sleeve body 7 is screwed into the screw body 1, the sealing member 11 An auxiliary ring 16 is press-fitted from the lower opening side of the sealing member 11 so that the entire diameter of the sealing member 11 is uniformly changed.

The sealing member of the third embodiment shown in FIG.
The configuration in which the auxiliary ring 16 is press-fitted from the lower mouth side so that the diameter of the sealing member 11 is uniformly changed as a whole is the same as that of the second embodiment described above, but in this embodiment, the sealing member 11 is The angle of both tapered surfaces 15a, 15b with respect to the center line of the inner surface of the member 11 is increased, and the lower end surface of the auxiliary ring 16 is fully in contact with the upper end surface of the deployable sleeve 5 in the deployed state, and the seal is sealed. Member 11, auxiliary ring 1
Occurs between related parts such as 6 and deployment sleeve 5〓
The aim is to minimize the space between them.

In each of the above-mentioned embodiments, each sealing member is shown to be constructed separately from the sleeve body, but it is also possible to make the lower end of the sleeve body thinner or to provide a longitudinal slit or the like in the lower end of the sleeve body. The lower end of the sleeve body has a variable diameter configuration all around the circumference, and the sleeve body and the sealing member are integrated so that the lower end of the sleeve body rides on the above-mentioned diameter expansion auxiliary ring equivalent member to change the diameter. Of course, this is also possible.

(Effects of the invention) According to the embedded screw implantation structure of this invention configured as described above, the following effects are achieved.

(1) The hole wall near the expanded hole above the deployable sleeve.
Since the gap is sealed with a sealing member, when used as an embedded screw, the movement of the embedded screw in the direction of rotation is restricted, and the expanded diameter hole wall receives the load of the structure and prevents the movement of the deployable sleeve, which is in a strongly crimped state. This reduces the wear and collapse of the enlarged diameter hole wall surface and reduces the decline in the strength of the embedded screw.

(2) Vibrations of the structure are transmitted to the embedded screws, and due to the micro-vibration movement of each deployable piece of the deployable sleeve that is strongly pressed against the wall of the enlarged diameter part, the wall of the enlarged diameter part may wear and collapse. Even if this occurs, the waste is confined within the enlarged diameter hole by the sealing member and cannot escape, so the presence of this contained waste reduces the subsequent abrasion and collapse of the enlarged diameter hole wall surface and reduces the damage over time. This eliminates the possibility of loosening of the structure when attaching the structure due to wear and tear of the wall surface of the enlarged diameter part, thereby increasing the reliability of the embedded screw.

(3) When installing embedded screws, there is almost no difference from conventional work, and the workability is good and it can be widely applied, and is particularly effective for installing embedded screws that are subject to downward loads in ceilings, etc. It is.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing how this invention is used;
Fig. 2 is a perspective view of the sealing member, Fig. 3 is a sectional view of the sealing member, Fig. 4 is a perspective view of a modified embodiment of the sealing member, and Fig. 5 is a usage pattern of the second embodiment of this invention. 6 is a longitudinal sectional view showing how the third embodiment of this invention is used, FIG. 7 is an exploded perspective view of a conventional embedded screw, and FIG. 8 is a usage mode of a conventional embedded screw. FIG. 1...Screw body, 2...Bolt body, 3...Protruding jaw, 4...Tapered surface, 5...Deployment sleeve, 6
... Deployment piece, 7 ... Sleeve body, 8, 9 ... Female thread, 10 ... Driver engagement groove, 11 ... Seal member, 12 ... Crack, 13, 14, 15, 17
... Tapered surface, 16 ... Auxiliary ring, A ... Fixed object, B ... Hole, C ... Expanded diameter hole, D ... Structure, E ... Mounting bolt.

Claims (1)

[Scope of utility model registration request] It is a combination of a screw body with a tapered surface at the bottom, a deployment sleeve that is loosely inserted into the screw body, and a sleeve body that is screwed into the screw body, and the deployment sleeve is inserted into the enlarged diameter hole formed deep inside the hole to be implanted. In the embedded screw implantation structure, which aims to expand and prevent the sleeve from coming out, the diameter is increased by screwing the sleeve body into the screw body, and the diameter of the hole wall near the enlarged hole portion is increased.
An embedded screw implantation structure characterized in that a variable diameter sealing member for sealing the gap is delivered between the sleeve body and the deployable sleeve.