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 female thread 19 is formed at the base end of the insert body 11. The male thread 21 of the bolt 20 is screwed into the female thread 19, and the laying equipment is fastened to the concrete structure 1 by the bolt 20. A cap 18 is provided at the base end of the insert body 11 which covers the receiving hole 12, and the cap 18 has a cylindrical portion 18b into which the female thread groove is bitten by the tip of the bolt 20.

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 kind 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. The insert is also used to attach suspensions such as drain pipes, rain gutters, and working 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] The insert for attaching laying equipment such as the above-mentioned processing machines, suspensions, and accessory devices to a concrete structure is embedded in the concrete structure as a kind 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 bolt having a male screw that screws into a female screw provided at the base end of the insert body and fastening the laying equipment to the concrete structure; and a cap that is attached to the base end of the insert body and covers the receiving hole, wherein the cap has a cylindrical portion into which the tip of the bolt engages with the female screw groove.

[0009] The present invention as described in claim 2 is characterized in that, in the invention described in claim 1, the cap is formed of a material with lower strength than the bolt.

[0010] The present invention as described in claim 3 is characterized in that, in the invention as described in claim 1, a washer is disposed between the mounting device attached to the installation 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]

[0011] According to the present invention as described in claim 1, the laying equipment is fastened to the concrete structure by a bolt that is screwed into the female thread of the insert body embedded in the concrete structure, and the cap provided at the base end of the insert body is provided with a cylindrical portion into which the tip of the bolt bites into the female thread groove, and the bolt is prevented from loosening due to vibration or the like by the cap that covers the base end of the insert body.

[0012] According to the present invention as described in claim 2, the bolt can be easily assembled to the insert body by rotating it relative to the insert body.

[0013] According to the present invention as described in claim 3, the fastening force of the bolt can be transmitted to the fixture via the washer, and the loosening of the bolt can be prevented. [Brief explanation of the drawing]

[0014] [Figure 1] The following are cross-sectional views showing an insert according to one 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 concrete bridge for attaching a suspension device 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 auxiliary device such as an exhaust duct to the inner surface of a concrete tunnel. [Figure 2] Figure 1(a) is a perspective view showing the mounting fixture and insert attached to the processing machine. [Figure 3] Figure 1(b) is a perspective view showing the mounting fixture and insert attached to the suspension structure. [Figure 4] Figure 1(c) is a perspective view showing the mounting bracket and insert that are attached to the accessory device. [Figure 5] This is an exploded cross-sectional view of an insert according to one 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

[0015] 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 components are generally denoted by the same reference numerals, and repeated explanations thereof are omitted.

[0016] 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 that is 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.

[0017] 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.

[0018] 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.

[0019] In FIGS. 1(a) and 1(c), two inserts 10 embedded in a concrete structure are shown, and in FIG. 1(b), one insert 10 embedded in the concrete structure is shown.

[0020] FIG. 5 is an exploded cross-sectional view of the insert 10 according to an embodiment of the present invention shown in FIGS. 1 to 4, and FIG. 6 is a cross-sectional view of the insert in a state where the laying device is attached to the concrete structure 1.

[0021] The insert 10 has an insert body 11 embedded in the concrete structure 1, and the insert body 11 is formed of ceramics such as alumina. A receiving hole 12 is formed in the insert body 11, and the receiving hole 12 opens to the outside through an opening 14 provided in the front end surface 13 of the insert body 11.

[0022] The front end side portion of the insert body 11 is a straight portion 15 having a substantially constant outer diameter, a bulging portion 16 having a larger diameter than the straight portion 15 is formed in the base end side portion, and a constricted portion 17 is formed between the bulging portion 16 and the straight portion 15. Due to the bulging portion 16 and the constricted portion 17, the insert body 11 bites into the concrete structure 1 and is firmly embedded.

[0023] The insert body 11 is attached to a mold in advance when the concrete structure 1 is constructed, and the insert body 11 is embedded in the concrete structure 1 by pouring concrete into the mold. In a state where the insert body 11 is embedded, the front end surface 13 is exposed on the outer surface of the concrete structure 1.

[0024] 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.

[0025] 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.

[0026] 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 18b engages with a groove formed in the insert body 11, preventing the cap 18 from coming off the insert body 11.

[0027] The base end of the insert body 11 is provided with a female thread 19 positioned closer to the tip of the insert body 11 than the cap 18.

[0028] The insert 10 has a bolt 20 that is incorporated into the housing hole 12 of the insert body 11. The tip of the bolt 20 is provided with a male thread 21 that screws into the female thread 19, and the rear end is provided with a head 22.

[0029] 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 female 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 single-start triangular screw with a triangular thread shape.

[0030] The insert 10 consists of an insert body 11 and a bolt 20. The bolt 20 is incorporated into the insert body 11, which is pre-embedded in the concrete structure 1, and is embedded in the concrete structure 1 together with the insert body 11.

[0031] When installing the laying equipment to the concrete structure 1, the bolt 20 is attached to the insert body 11 by screwing the male thread 21 into the female thread 19 of the insert body 11, with the washer 23 attached. At this time, since the cap 18 is made of a material with lower strength than the bolt 20, as shown in Figure 6, the end of the male thread 21 of the bolt 20 bites into the cylindrical portion 18b, and a female thread groove 24 is formed in the cylindrical portion 18b of the cap 18. As a result, when the bolt 20 is attached to the insert body 11, the bolt 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.

[0032] 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 a bolt 20, which is a screw member.

[0033] 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 then assembled to the insert body 11 with the bolt 20. A washer 23 is placed between the head 22 of the bolt 20 and the mounting fixture 2, and the fastening force of the bolt 20 is transmitted to the mounting fixture 2 via the washer 23.

[0034] The outer surface of the washer 23 abuts against the head 22 of the bolt 20, and the inner surface of the washer 23 abuts against the tip surface 13 of the insert body 11. Therefore, the fastening force of the head 22 of the bolt 20 is transmitted to the tip surface 13 via the washer 23 and the mounting device 2, and the mounting device 2 of the installation equipment is firmly attached to the insert 10.

[0035] The male thread 21 of the bolt 20 bites into the cylindrical portion 18b of the cap 18 and is connected to the cap 18 in such a way that it elastically deforms the cylindrical portion 18b to form a female thread groove 24. As a result, the cap 18 prevents the screw from loosening, and the bolt 20 is reliably prevented from loosening even if the mounting fixture 2 of the laying equipment vibrates.

[0036] However, the male thread 21 of the bolt 20 that screws into the female thread 19 of the insert body 11 may be a tapping screw, and a female thread groove 24 may be cut into the cylindrical portion 18c of the cap 18. Alternatively, a tapping screw smaller in diameter than the male thread 21 may protrude from the end face of the male thread 21. 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.

[0037] 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.

[0038] 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 screw 21 and female screw 19 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, round screws with a rounded cross-section of the thread may also be used.

[0039] 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]

[0040] 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]

[0041] 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 20 volts 21 Male screw 22 Head 23 Washer 24 Female thread grooves

Claims

1. An insert body, with an opening for the receiving hole at its tip, is embedded in a concrete structure. A male thread is provided that screws into a female thread provided at the base end of the insert body, and a bolt is provided for fastening the installation equipment to the concrete structure, The insert body has a cap that is attached to the base end and covers the housing hole, The cap is an insert characterized by having a cylindrical portion into which the tip of the bolt engages with the female screw groove.

2. The insert according to claim 1, characterized in that the cap is formed of a material with lower strength than the bolt.

3. The insert according to claim 1, having 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