insert

Abstract

The purpose is to prevent the screw threads of the insert from loosening. [Solution] An opening 14 for a receiving hole 12 is provided at the tip of the insert body 11 which is embedded in the concrete structure 1, and a first female thread 19 is formed at the base end of the insert body 11. A first male thread 21 that screws into the first female thread 19 is provided at one end of the fastening screw member 20, and a second male thread 25 of a bolt 24 is screwed into a second female thread 22 provided at the other end of the fastening screw member 20, and the equipment is fastened to the concrete structure 1 by the bolt 24. One of the first male thread 21 and the second male thread 25 is a right-hand thread, and the other is a left-hand thread.

Description

Technical Field

[0001] The present invention relates to an insert embedded in a concrete structure for attaching laying equipment such as processing machines to concrete structures such as concrete slabs.

Background Art

[0002] An insert, which is a type of concrete anchor, is used to attach processing machines such as presses, laser cutting machines, and lathes to a concrete slab, which is a concrete floor slab. In addition, the insert is also used to attach suspensions such as drain pipes, rain gutters, and work scaffolds to concrete bridges. Furthermore, the insert is also used to attach accessory devices such as exhaust jet fans and exhaust ducts to the inner surface of a concrete tunnel.

[0003] An insert for attaching laying equipment such as the above-described processing machines, suspensions, and accessory devices to a concrete structure is embedded in the concrete structure as a type of anchor member.

[0004] Patent Document 1 discloses an insert for attaching a pipe, which is laying equipment, to a wall of a building such as a concrete building. The insert has an insert body embedded in the wall of the building, and by fastening a fitting attached to the pipe to the insert body with a fastening screw member, the pipe is attached to the wall, and the fastening screw member is embedded in the building together with the insert body.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] When suspended structures or other laid equipment vibrates, that vibration is transmitted to the mounting fixtures attached to the equipment. Therefore, if the equipment has been attached to a concrete structure for a long period of time, it is expected that the screw members of the inserts will loosen due to vibrations in the mounting fixtures. For this reason, the maintenance and inspection period for equipment attached to concrete structures cannot be extended. If the loosening of the screw members can be prevented even when the equipment vibrates, the reliability of the inserts can be increased, and the maintenance and inspection period for the equipment can be extended.

[0007] The present invention has been made in light of the above-mentioned technical background, and aims to provide a technology that can prevent the loosening of the screw member of the insert. [Means for solving the problem]

[0008] To solve the above problems, the insert of the present invention as described in claim 1 comprises: an insert body having an opening for a receiving hole at its tip and being embedded in a concrete structure; a fastening screw member having a first male screw at one end that screws into a first female screw at the base end of the insert body; and a bolt having a second male screw at the other end of the fastening screw member that screws into a second female screw, for fastening the laying equipment to the concrete structure, wherein one of the first male screw and the second male screw is a right-hand thread and the other is a left-hand thread.

[0009] Furthermore, the present invention as described in claim 2 is characterized in that, in the invention described in claim 1 above, it has a cap that is attached to the base end of the insert body and closes the housing hole.

[0010] Furthermore, the present invention as described in claim 3 is characterized in that, in the invention described in claim 2 above, the cap has a cylindrical portion into which the female screw groove is engaged by one end of the fastening screw member.

[0011] Furthermore, the present invention as described in claim 4 is characterized in that, in the invention described in claim 3 above, the cap is formed of a material with lower strength than the fastening screw member.

[0012] Furthermore, the present invention as described in claim 5 is characterized in that, in the invention described in claim 1 above, the first male screw is a right-hand thread and the second male screw is a left-hand thread.

[0013] Furthermore, the present invention as described in claim 6 is characterized in that, in the invention described in claim 1 above, the first male screw and the second male screw have different screw pitches.

[0014] Furthermore, the present invention as described in claim 7 is characterized in that, in the invention as described in claim 1 above, a washer is disposed between the mounting device attached to the laying equipment and the head of the bolt, and the fastening force of the bolt is transmitted to the mounting device via the washer. [Effects of the Invention]

[0015] According to the present invention as described in claim 1, one of the first male threads of the fastening screw member that is screwed into the female thread of the insert body and the second male thread of the bolt that is screwed into the fastening screw member is a right-hand thread and the other is a left-hand thread, so that the insert body, the fastening screw member and the bolt do not loosen due to vibration or the like.

[0016] According to the present invention as described in claim 2, the containment hole is closed by a cap, preventing concrete from entering the inside of the containment hole.

[0017] According to the present invention as described in claim 3, the cap has a cylindrical portion into which a female screw groove is engaged by one end of the fastening screw member, and the cap prevents the fastening screw member from loosening.

[0018] According to the present invention described in claim 4, since the cap is formed of a material having a lower strength than the fastening screw member, the fastening screw member can be easily fastened to the insert body by rotating the fastening screw member with respect to the insert body.

[0019] According to the present invention described in claim 5, by making the first male screw a right-handed screw, mass-produced products can be used as the insert body.

[0020] According to the present invention described in claim 6, if the pitches of the first male screw and the second male screw are made different, it is possible to prevent the bolt and the fastening screw member from loosening.

[0021] According to the present invention described in claim 7, the fastening force of the bolt can be evenly transmitted to the fixture through the washer, and loosening of the bolt can be prevented.

Brief Description of the Drawings

[0022] [Figure 1] It is a cross-sectional view showing an insert according to an embodiment of the present invention. (a) is a cross-sectional view showing an insert embedded in a concrete slab for attaching a processing machine such as a press to the concrete slab, (b) is a cross-sectional view showing an insert embedded in a bridge for attaching a suspension such as a drain pipe to the concrete bridge, and (c) is a cross-sectional view showing an insert attached to a tunnel for attaching an accessory device such as an exhaust duct to the inner surface of the concrete tunnel. [Figure 2] It is a perspective view showing a mounting member and an insert attached to a processing machine as shown in Fig. 1(a). [Figure 3] It is a perspective view showing a mounting member and an insert attached to a suspension as shown in Fig. 1(b). [Figure 4] It is a perspective view showing a mounting member and an insert attached to an accessory device as shown in Fig. 1(c). [Figure 5] It is an exploded cross-sectional view of an insert according to an embodiment of the present invention. [Figure 6] It is a cross-sectional view of an insert in a state where a laying machine is attached to a concrete structure.

Embodiments for Carrying Out the Invention

[0023] Hereinafter, embodiments as an example of the present invention will be described in detail based on the drawings. In the drawings for explaining the embodiments, the same reference numerals are generally given to the same components, and repeated explanations thereof are omitted.

[0024] As shown in FIGS. 1(a) and 2, a fixture 2 for attaching a processing machine, which is a kind of laying equipment, to the upper surface of a concrete slab 1a of a concrete structure 1 (FIG. 6) has a cylindrical member 3 to which the processing machine is attached and two leg pieces 4 fixed to the cylindrical member 3. Each leg piece 4 has a fixing portion 4a welded and fixed to the cylindrical member 3 and a fastening portion 4b bent at a right angle with respect to the fixing portion 4a, and the fastening portion 4b is fastened to the concrete slab 1a by two inserts 10 embedded in the concrete slab 1a.

[0025] As shown in FIGS. 1(b) and 3, a fixture 2 for attaching a suspension, which is a kind of laying equipment, to the side surface of a concrete pier 1b has a fixing portion 5a to which the suspension is attached and a fastening portion 5b bent at a right angle with respect to the fixing portion 5a. A screw hole 5c for attaching the suspension is formed in the fixing portion 5a, and the fastening portion 5b is fastened to the pier 1b by an insert 10 embedded in the pier.

[0026] As shown in FIGS. 1(c) and 4, a mounting member 2 for attaching an accessory device, which is a kind of laying equipment, to the inner surface of a tunnel 1c has a fixing portion 7a to which the accessory device is attached by bolts 6 and a fastening portion 7b to which the fixing portion 7a is welded to the outer surface, and the fastening portion 7b is fastened to the tunnel 1c by two inserts 10 embedded in the tunnel 1c.

[0027] Figures 1(a) and 1(c) show two inserts 10 embedded in a concrete structure, while Figure 1(b) shows one insert 10 embedded in a concrete structure.

[0028] Figure 5 is an exploded cross-sectional view of the insert 10 according to one embodiment of the present invention shown in Figures 1 to 4, and Figure 6 is a cross-sectional view of the insert in a state in which the laying equipment is attached to the concrete structure 1.

[0029] The insert 10 has an insert body 11 that is embedded in a concrete structure 1, and the insert body 11 is made of a ceramic such as alumina. A housing hole 12 is formed in the insert body 11, and the housing hole 12 is open to the outside through an opening 14 provided on the tip surface 13 of the insert body 11.

[0030] The tip side of the insert body 11 is a straight section 15 with a nearly constant outer diameter, and the base side has a bulging section 16 with a larger diameter than the straight section 15, with a constricted section 17 formed between the bulging section 16 and the straight section 15. Due to the bulging section 16 and the constricted section 17, the insert body 11 bites into the concrete structure 1 and is firmly embedded.

[0031] The insert body 11 is attached to the formwork in advance when constructing the concrete structure 1, and is embedded in the concrete structure 1 by pouring concrete into the formwork. When the insert body 11 is embedded, the tip surface 13 is exposed on the outer surface of the concrete structure 1.

[0032] When insert 10 is used to attach a processing machine to a concrete slab 1a, as shown in Figures 1(a) and 2, the insert body 11 is embedded in the concrete slab 1a. When insert 10 is used to attach a suspension to a bridge, as shown in Figures 1(b) and 3, the insert body 11 is embedded in the bridge 1b. Furthermore, when insert 10 is used to attach an accessory to a tunnel, as shown in Figures 1(c) and 4, the insert body 11 is embedded in the tunnel.

[0033] A cap 18 is attached to the base end of the insert body 11 to close the housing hole 12. When the insert body 11 is embedded in a concrete structure 1 such as a concrete slab 1a, the cap 18 prevents the concrete poured into the formwork from flowing into the housing hole 12.

[0034] The cap 18 is made of a synthetic resin such as nylon, which has lower strength than the material of the insert body 11, and has an end plate portion 18a that closes the housing hole 12 and a cylindrical portion 18b that fits onto the inner circumferential surface of the housing hole 12. An engaging portion 18c is provided on the tip side of the cylindrical portion 18b, which protrudes radially outward from the cylindrical portion 18b, and the engaging portion 18c engages with a groove formed in the insert body 11, preventing the cap 18 from coming off the insert body 11.

[0035] At the base end of the insert body 11, a female thread 19 is provided as a first female thread, positioned closer to the tip of the insert body 11 than the cap 18.

[0036] The insert 10 has a fastening screw member 20 that is incorporated into the housing hole 12 of the insert body 11. One end of the fastening screw member 20 is provided with a first male screw, a male screw 21 that screws into, i.e., connects to, the female screw 19.

[0037] The male screw 21 is a right-hand thread. When the fastening screw member 20 is rotated to the right when viewed from the axial direction, the fastening screw member 20 moves in a direction that enters the male screw 19, and when rotated in the opposite direction, it moves in a direction that exits the female screw 19. The male screw 21 is a triangular screw with a triangular thread shape and is a single-start screw with a pitch P1.

[0038] An internal female thread 22 is provided at the other end of the fastening screw member 20 as a second internal female thread, and the internal female thread 22 opens on one end face 23 of the fastening screw member 20. A bolt 24, which is screwed into the internal female thread 22, fastens the laying equipment such as processing machinery to the concrete structure 1. The bolt 24 has an internal male thread 25, which is a second internal male thread that is screwed into the internal female thread 22, and a head 26.

[0039] The insert 10 comprises an insert body 11, a fastening screw member 20, and a bolt 24. The fastening screw member 20 and the bolt 24 are incorporated into the insert body 11, which is pre-embedded in the concrete structure 1, and are embedded in the concrete structure 1 together with the insert body 11.

[0040] The male screw 25 is a left-hand thread. When the bolt 24 is rotated counterclockwise when viewed from the axial direction, the bolt 24 moves inward into the male screw 22, and when rotated in the opposite direction, it moves outward from the female screw 22. The male screw 25 is a triangular thread with a triangular shape and is a single-start thread with a pitch of P2. The pitch P2 is smaller than the pitch P1 of the male screw 21 (P1 > P2).

[0041] The fastening screw member 20 is pre-inserted into the housing hole 12 of the insert body 11, and the male thread 21 is screwed into the female thread 19. At this time, since the cap 18 is made of a material with lower strength than the fastening screw member 20, as shown in Figure 6, the end of the male thread 21 of the fastening screw member 20 bites into the cylindrical portion 18b, and a female screw groove 27 is formed in the cylindrical portion 18b of the cap 18. As a result, when the fastening screw member 20 is attached to the insert body 11, the fastening screw member 20 and the insert body 11 are firmly connected, and the cap 18, which prevents concrete from flowing into the housing hole 12, also functions as a screw loosening prevention device.

[0042] With the fastening screw member 20 attached to the insert body 11, the end face 23 of the fastening screw member 20 is set to be almost flush with the front face 13 of the insert body 11.

[0043] In Figure 6, a concrete structure such as a concrete slab 1a is indicated by reference numeral 1, and the mounting fixture 2 attached to the laying equipment is shown fastened with bolts 24.

[0044] When installing the laying equipment to the concrete structure 1 using the insert 10, as shown in Figure 6, the mounting fixture 2 attached to the laying equipment is abutted against the outer surface of the concrete structure 1 and against the tip surface 13 of the insert body 11, and the male thread 25 of the bolt 24 is screwed into the female thread 22 to assemble the bolt 24 to the fastening screw member 20. A washer 28 is placed between the head 26 of the bolt 24 and the mounting fixture 2, and the fastening force of the bolt 24 is transmitted to the screw connection surface of the male thread 25 and the female thread 22, and also to the mounting fixture 2 via the washer 28.

[0045] The outer surface of the washer 28 abuts against the head 26 of the bolt 24, and the inner surface of the washer 28 abuts against the tip surface 13 of the insert body 11. Therefore, the fastening force of the head 26 of the bolt 24 is transmitted to the tip surface 13 via the washer 28 and the mounting device 2, and the mounting device 2 of the laying equipment is firmly attached to the insert 10.

[0046] With the installation equipment attached to the insert 10, the male thread 21 of the fastening screw member 20, which is a right-hand thread, is screwed into the female thread 19 of the insert body 11, and the male thread 25 of the bolt 24, which is a left-hand thread, is screwed into the female thread 22 of the fastening screw member 20. Therefore, even if the bolt 24, which is a left-hand thread, is subjected to an external force that loosens the fastening screw member 20, i.e., an external force in the direction of right-hand rotation, due to vibrations of the installation fixture 2 of the installation equipment or the concrete structure 1, that external force will advance the male thread 21, which is a right-hand thread, of the fastening screw member 20 relative to the insert body 11.

[0047] This ensures that the bolts 24 and fastening screw members 20 do not loosen even if the installation equipment vibrates.

[0048] Male screw 21 is a right-hand thread and male screw 25 is a left-hand thread. However, even if male screw 21 is a left-hand thread and male screw 25 is a right-hand thread, loosening of the screws can be reliably prevented. In other words, if both screws are threaded in opposite directions, and one of the two male screws 21 and 25 is a right-hand thread and the other is a left-hand thread, the combination of right-hand and left-hand threads can prevent loosening of the screws and extend the maintenance and inspection period of the installed equipment.

[0049] Furthermore, since the male threads 21 and 25 have different pitches, they are prevented from rotating together in the same direction, thus reliably preventing the bolt 24 and the fastening screw member 20 from loosening. Even if the outer diameter of the male thread 25 is larger than that of the male thread 21, loosening can still be prevented by making the pitches of the two male threads 21 and 25 different. In that case, the outer diameter of the portion of the fastening screw member 20 where the female thread 22 is formed will be larger than that of the portion with the male thread 21.

[0050] The male thread 21 of the fastening screw member 20 bites into the cylindrical portion 18b of the cap 18, causing the cylindrical portion 18b to elastically deform and form a female screw groove 27, thereby preventing the screw from loosening with the cap 18.

[0051] However, the male thread 21 of the fastening screw member 20 that screws into the female thread 19 of the insert body 11 may be a tapping screw, and a female screw groove 27 may be cut into the cylindrical portion 18c of the cap 18. Alternatively, a tapping screw smaller in diameter than the male thread 19 may protrude from the end face of the male thread 19. In that case, the inner circumferential surface of the cylindrical portion 18b of the cap 18 will be set to a smaller diameter than shown in the figure.

[0052] The present inventors have described the invention in detail based on embodiments, but the embodiments disclosed herein are illustrative in all respects and are not limited to the disclosed technology. That is, the technical scope of the present invention should not be interpreted restrictively based on the description of the embodiments above, but rather in accordance with the claims, and includes the equivalent technology of the claimed technology and all modifications that do not depart from the gist of the claims.

[0053] For example, the installation equipment attached to the concrete structure 1 is not limited to the processing machines and the like described above, but can be anything that can be attached to the insert 10 by a screw member. Furthermore, the male screws 21, 25 and female screws 19, 22 are not limited to triangular screws with a triangular cross-sectional shape of the thread, but may be trapezoidal screws with a trapezoidal cross-sectional shape of the thread, square screws with a cross-sectional shape of the thread close to the positive direction, or sawtooth screws that combine square screws and triangular screws. Moreover, they may be round screws with a rounded cross-section of the thread.

[0054] Furthermore, although the insert body 11 is made of ceramics in this embodiment, it may be made of a material other than ceramics, such as stainless steel, iron, aluminum, or other metals. [Industrial applicability]

[0055] The insert of the present invention has an insert body that is embedded in concrete structures such as concrete slabs and concrete bridge piers, and can be used to attach laying equipment to concrete structures by screw members that are screw-connected to the insert body. [Explanation of symbols]

[0056] 1. Concrete structures 1a Concrete slab 1b Bridge pier 1c Tunnel 2. Mounting hardware 3. Cylindrical member 4 leg pieces 4a Fixed part 4b Fastening part 5a Fixed part 5b Fastening section 6 volts 7a Fixed part 7b Fastening section 10 inserts 11 Insert body 12 containment holes 13 Tip surface 14 Opening 15. Straight section 16 Bulge 17. Constricted area 18 caps 18a End plate part 18b Cylindrical section 18c Engagement part 19 Female thread (first female thread) 20 Fastening screw member 21 Male screw (first male screw) 22 Female thread (second female thread) 23 End face 24 volts 25 Male screw (second male screw) 26 Head 27 Female thread groove 28 Washer

Claims

1. An insert body, with an opening for the receiving hole at its tip, is embedded in a concrete structure. A fastening screw member having a first male screw at one end that screws into a first female screw provided at the base end of the insert body, A bolt is provided which a second male thread is screwed into a second female thread provided at the other end of the fastening screw member, and which fastens the installation equipment to the concrete structure. An insert characterized in that one of the first male screw and the second male screw is a right-hand thread, and the other is a left-hand thread.

2. The insert according to claim 1, characterized in that it has a cap that is attached to the base end of the insert body and closes the housing hole.

3. The insert according to claim 2, characterized in that the cap has a cylindrical portion into which the female screw groove is engaged by one end of the fastening screw member.

4. The insert according to claim 3, characterized in that the cap is formed of a material with lower strength than the fastening screw member.

5. The insert according to claim 1, characterized in that the first male thread is a right-hand thread and the second male thread is a left-hand thread.

6. The insert according to claim 1, characterized in that the first male screw and the second male screw have different screw pitches.

7. The insert according to claim 1, comprising a washer positioned between the mounting device attached to the installation equipment and the head of the bolt, wherein the fastening force of the bolt is transmitted to the mounting device via the washer.

Images