CN219327713U - Expansion bolt for aerated brick - Google Patents

Abstract

The utility model discloses an expansion bolt for an aerated brick, which is applied to the field of construction and comprises a bolt rod, a sleeve, a small shaft and an expansion piece. The threaded end of the bolt rod is provided with a gasket nut, the middle polished rod is sleeved in the sleeve, the polished rod is in transitional connection with the fastening end bolt conical surface, grooves are uniformly distributed in the circumferential direction of the bolt conical surface, a groove inclined surface is processed in the grooves, and the groove inclined surface is in point contact fit with the cambered surface of the expansion piece. The expansion piece is in rotary fit with a small shaft fixed at the upper end of the sleeve. The bolt rod moves outwards, and the expansion piece is opened and inserted into the aerated brick by the groove inclined surface, so that the fastening is realized. The utility model has the advantages of few parts, low manufacturing cost, good fastening effect and simple operation.

Description

Expansion bolt for aerated brick

Technical Field

The utility model is applied to the field of buildings, relates to a fastener for installation, and in particular relates to an expansion bolt which is fastened and installed on an aerated brick wall.

Background

In the building industry, the aerated brick has good heat preservation and sound insulation effects due to more cavities, and is widely applied. Decoration, installation, hanging of electrical appliances, equipment, furniture and the like on a wall are common phenomena, but because of more cavities in the aerated brick, the strength is low, the friction between the aerated brick and an installed bolt is small, fragments are easy to generate, and the aerated brick is not enough to be fastened on the aerated brick wall. Publication number CN217462798U discloses a special expansion bolt for hollow brick wall, where the mounting plate and the fixing plate are fixed on two sides of the hollow brick wall, and a through hole needs to be formed in the wall, which is often less, especially in the wall of a household, and such a mounting mode is impossible. The publication No. CN202768570U discloses a shear type expansion bolt suitable for a hollow brick or a porous light brick wall body, which comprises an expansion piece, a fixing piece and a pushing piece, wherein the expansion piece is hinged at the end head of the fixing piece, the pushing piece is in sliding connection with the fixing piece, and the inclined plane of the expansion piece is matched with the inclined plane of the pushing piece. When in use, the nut is rotated, the inclined surface of the pushing piece pushes the expansion piece to open, and the expansion piece is fastened in the hollow brick wall. The expansion bolt is well fastened in the hollow brick wall, but has the advantages of complex structure, more parts and high manufacturing cost. The publication No. CN212272753U discloses a multi-wall high-adaptability expansion bolt which can be used for hollow bricks, foam wall surfaces and externally hung walls, expansion pipes and expansion pipe gaskets are coaxially sleeved on a screw rod, the tail part of a fixed screw rod directly pulls the screw rod outwards, the front end of the expansion pipe is in threaded connection with the screw rod, and softer expansion pieces can be stretched, deformed and expanded in an umbrella shape at folds, and gaps in the middle part of the expansion pipe outwards protrude into the wall. The expansion bolt has the advantages that the expansion pipe gasket is low in strength, easy to umbrella-shaped tensile deformation, high in strength and poor in practicality, and cannot enter a wall body, and deformation cannot be controlled. The publication No. CN216922767U discloses an expansion bolt with large expansion amount, which has the advantages of more parts, small size and complex structure, and is applied to the expansion bolt, and has high manufacturing cost and no popularization value.

Disclosure of Invention

The utility model solves the technical problems that: the expansion bolt for the aerated brick has the advantages of simple structure, low manufacturing cost, good fastening effect by utilizing friction force and fastening in a wall body.

The technical scheme adopted by the utility model is as follows: the expansion bolt for the aerated brick comprises a bolt rod, a sleeve, a small shaft and an expansion piece. The lower end of the bolt rod is a threaded end, the middle part is a polished rod, the upper end is a fastening end, the polished rod is sleeved in the sleeve, the joint of the polished rod and the fastening end is a reducing bolt conical surface, grooves are uniformly distributed in the circumferential direction of the bolt conical surface, a groove inclined surface is machined in the groove, and the groove inclined surface is in point contact fit with a cambered surface of the expansion sheet. The expansion piece is in rotary fit with the small shaft, and the small shaft is fixed at the upper end of the sleeve. The threaded end is sleeved with a gasket and is connected with a nut through threads. In order to strengthen the component force of the expansion sheet inserted into the wall body, the included angle between the inclined plane of the groove and the central line is 25-35 degrees, and the taper angle of the tapered surface of the bolt is 50-70 degrees.

Further, to facilitate the insertion of the expansion plug into the borehole in the wall, the distance between the borehole wall and the sleeve is reduced, and the maximum outer diameter of the fastening end is no greater than the outer diameter of the sleeve.

Furthermore, the small shaft can be directly fixed on the sleeve or can be fixed on the bracket, and the bracket is uniformly distributed and fixed at the upper end of the sleeve.

Further, in order to increase the fastening effect, the back edge of the expansion sheet is processed with a pointed bulge.

Further, for easy installation, reduce wall body drilling depth, the front end processing of fastening end has the pit, and this pit can store brick powder.

The beneficial effects of the utility model are as follows: the utility model has less parts and low manufacturing cost. The expansion bolt is fastened by utilizing the friction force between the cylinder body and the hole wall and the expansion piece to be plugged into the aerated brick, so that the fastening effect is good. The operation is simple, and the construction is convenient.

Drawings

FIG. 1 is a schematic front view of the structure of embodiment 1;

FIG. 2 is a schematic cross-sectional view of A-A of FIG. 1;

FIG. 3 is a right side schematic view of FIG. 1;

FIG. 4 is a schematic cross-sectional view of B-B of FIG. 3;

FIG. 5 is an initial expansion schematic of example 1;

FIG. 6 is an intermediate expansion schematic of example 1;

FIG. 7 is a final expansion schematic of example 1;

FIG. 8 is a schematic front view of the structure of embodiment 2;

FIG. 9 is a schematic front view of the structure of embodiment 3;

FIG. 10 is a schematic diagram of the structure of embodiment 4;

wherein: 1-nut, 2-gasket, 3-bolt rod, 4-sleeve, 5-bracket, 6-small shaft, 7-expansion piece, 8-groove, 9-bolt conical surface, 10-groove inclined surface, 11-piece cambered surface, 12-pit, 13-bulge and 14-opening.

Description of the embodiments

Example 1

The expansion bolt structure of the embodiment is shown in figures 1-4, and comprises a nut 1, a gasket 2, a bolt rod 3, a sleeve 4, an expansion sheet 7 and the like. The bolt rod 3 is sleeved in the sleeve 4, the lower end of the bolt rod 3 is a threaded end, the middle part is a polished rod, and the upper end is a fastening end. The threaded end is sleeved with a gasket 2 and is connected with a nut 1 in a threaded manner. The maximum outer diameter of the fastening end is the same as the outer diameter of the sleeve 4, and a tapered bolt conical surface 9 with a variable diameter is processed at the joint of the polished rod and the fastening end, and the taper angle of the tapered bolt conical surface is 50-70 degrees. Grooves 8 are uniformly distributed on the conical surface 9 of the bolt. The lower extreme and the gasket 2 cooperation of sleeve 4, the upper end equipartition welding support 5 of sleeve 4, connect pony roll 6 on the support 5, expansion piece 7 and pony roll 6 rotate to be connected. The support 5, the small shaft 6 and the expansion piece 7 are uniformly distributed in the circumferential direction of the sleeve 4, and the number of the support is three in the embodiment.

The groove 8 is matched with the expansion sheet 7 correspondingly, a groove inclined surface 10 is processed in the groove 8, and the groove inclined surface 10 is in point contact fit with a sheet cambered surface 11 on the expansion sheet 7. The lower end of the expansion piece 7 is provided with a through hole and sleeved on the small shaft 6, and the expansion piece can freely rotate around the small shaft 6. In order to strengthen the component force of the expansion sheet 7 inserted into the wall body, the included angle between the groove inclined surface 10 and the central line should not exceed 45 degrees, preferably 25-35 degrees, the smaller the angle is, the larger the component force of the expansion sheet inserted into the wall body is, but the longer the length of the expansion sheet extending out of the wall body is.

When the expansion bolt is manufactured, the bracket 5, the small shaft 6 and the expansion sheet 7 are assembled firstly, then the bracket 5 is welded at the end part of the sleeve 4, the bracket is uniformly distributed in the circumferential direction of the sleeve, then the bolt rod 3 is sleeved, the expansion sheet 7 is placed in the groove, the gasket 2 is sleeved, the nut is screwed, the expansion sheet position is bound by the rubber band, and the expansion sheet 7 is prevented from being unscrewed from the groove 8 in storage and transportation.

The expansion bolt is used as shown in figures 5-7. Firstly, drilling holes in the aerated brick wall, then, putting the expansion plug into the holes, tightly attaching the gasket 2 to the wall, screwing the nut 1, moving the bolt rod 3 and the sleeve 4 outside the wall, stopping moving the sleeve outwards when the sleeve contacts the gasket, and continuing to move the bolt rod 3 outwards, wherein the force of the groove inclined surface 10 of the groove 8 acting on the sheet cambered surface 11 causes the expansion sheet 7 to rotate around the small shaft 6 inside the wall, and inserting the expansion sheet into the wall, as shown in figure 5. The bolt shank 3 continues to move outwards and the bolt cone 9 contacts the bracket 5 as shown in fig. 6. And the nut is screwed continuously, the bolt conical surface 9 enables the support 5 to expand outwards, the end part of the sleeve deforms to contact the hole wall, and the expansion sheet is continuously inserted into the wall in a large range while the sleeve expands outwards, as shown in fig. 7. At this time, the continued outward movement of the bolt rod 3 needs to overcome the friction force between the sleeve 4 of the bracket 5 and the wall of the hole and the large-scale deformation of the wall, and the expansion bolts are firmly fastened on the wall due to the large resistance. The above description is only of the principle of action fixation of the expansion bolts, and does not relate to a structural frame to be installed.

Taking the bolt of M10 as an example, the outer diameter of the sleeve, the outer diameter phi 20 of the fastening end, the wall drilling phi 21, the thickness of the sleeve between 0.8 and 1.2mm, the length of the sleeve between 50 and 100mm, the thickness of the expansion sheet between 0.8 and 1.2mm, the diameter of the small shaft phi between 2.5 and 3mm, the included angle between the groove inclined plane and the central line is 30 degrees, the angle of the bolt conical surface is 65 degrees, and the state of the attached figure 7 can be achieved by moving the bolt rod outwards by 3 to 4mm after the bolt rod contacts with the gasket from the sleeve.

Example 2

In example 1, the front of the fastening end is tapered, and to facilitate insertion into a borehole in a wall, the powder of the brick is displaced to the wall of the borehole. When the depth of the borehole is insufficient due to the brick powder, the sleeve cannot be fully inserted into the borehole, and re-boring or increasing the depth of the borehole is required. For this purpose, the front of the fastening end is modified to the present embodiment. As shown in fig. 8, a pit 12 is formed at the front end of the fastening end, and when the expansion plug is inserted into the drill hole, the pit 12 can store the brick powder, thereby avoiding the need of increasing the depth of the drill hole due to the brick powder, and simultaneously, the pit can reduce the weight of the bolt rod and save metal.

Example 3

To increase the fastening between the expansion sheet and the aerated brick and promote the deformation and fracture of the aerated brick, a pointed protrusion 13 is added on the back ridge of the expansion sheet inserted into the wall, as shown in fig. 9.

In the above embodiment, three expansion sheets are uniformly distributed as an example, and two expansion bolts with small specifications can be used, and four expansion bolts with large specifications can be used, so that the expansion bolts can be uniformly stressed and have standardized interchangeability, and the like, and the expansion bolts can be uniformly distributed along the circumference.

Example 4

The above embodiment adopts a bracket to fix the small shaft, the utility model does not exclude other schemes for fixing the small shaft, as shown in fig. 10, the small shaft 6 is directly fixed on the sleeve 4 without using the bracket 5, and an opening 14 is formed on the sleeve 4 to reserve space for the rotation of the expansion sheet 7. The small shaft 6 is not easy to extend out of the sleeve 4, otherwise, the expansion bolts are not easy to be inserted into wall body holes.

The utility model has few parts, the expansion bolt manufacturer only needs to manufacture bolt rods, brackets, small shafts and expansion sheets in batches by using special dies, the sleeve, the gasket and the nut can be purchased from a professional manufacturer in large quantity, the brackets, the small shafts, the expansion sheets and the sleeve can be fixed by using the special dies, and the expansion bolt manufacturer can assemble the expansion bolt with the bolt rods, the gasket and the nut after integrating the expansion bolt. In particular, example 4, the bracket 5 components are omitted.

After the gas filling brick is plugged into a drilling hole, the gas filling brick can be fastened by screwing the nut, the operation is simple and convenient, the gas filling brick and the gas filling brick are integrated, and the fastening effect is good.

Claims (6)

1. An expansion bolt for aerated bricks is characterized in that: comprises a bolt rod (3), a sleeve (4), a small shaft (6) and an expansion sheet (7); the lower end of the bolt rod (3) is a threaded end, the middle part is a polished rod, the upper end is a fastening end, the polished rod is sleeved in the sleeve (4), the joint of the polished rod and the fastening end is a reducing bolt conical surface (9), grooves (8) are uniformly distributed in the circumferential direction of the bolt conical surface (9), a groove inclined surface (10) is processed in the grooves (8), and the groove inclined surface (10) is in point contact fit with a cambered surface (11) on the expansion sheet (7); the expansion pieces (7) are rotationally connected with the small shafts (6), and the small shafts (6) are uniformly distributed and fixed at the upper ends of the sleeves (4).

2. An expansion bolt for aerated bricks according to claim 1, wherein: the taper angle of the bolt taper surface (9) is 50-70 degrees, and the included angle between the groove inclined surface (10) and the central line is 25-35 degrees.

3. An expansion bolt for aerated bricks according to claim 1, wherein: the maximum outer diameter of the fastening end is not larger than the outer diameter of the sleeve (4).

4. An expansion bolt for aerated bricks according to claim 1, wherein: the small shaft (6) is fixed on the sleeve (4) or on the bracket (5), and the bracket (5) is fixed at the upper end of the sleeve (4).

5. An expansion bolt for aerated bricks according to claim 1, wherein: the back edge of the expansion sheet (7) is processed with a pointed bulge (13).

6. An expansion bolt for aerated bricks according to claim 1, wherein: the front end of the fastening end is provided with a pit (12).

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