Forward expansion embedded steel bar anchor bolt
By designing the expansion head and expansion claw structure of the forward expansion tendon anchor bolt, the traditional expansion direction is changed, the pull-out resistance is increased, and the stable connection with the wall is achieved through the injection of the slurry glue into the cavity, which solves the stability of the traditional expansion bolt Issues of insufficient sexuality and firmness.
Patent Information
- Application Number
- CN202420522513.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-18
AI Technical Summary
Traditional expansion bolts are prone to desilvering when pulling upwards, and the expansion direction is facing the inner side of the wall, resulting in insufficient pulling resistance and insufficient stability and firmness.
A forward expansion steel anchor bolt is designed. The expansion head consists of hollow screws, expansion claws, sleeves and nuts. The expansion claws expand outward, and combine slurry to inject into the expansion head and wall gap to enhance the connection.
The expansion claws expand to the outside, which increases the pull-out resistance, and the cavity is filled with slurry glue to achieve a stable connection with the wall, improving the stability and firmness of the expansion anchor bolt.
Smart Images
Figure CN222163143U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of expansion anchor bolts, in particular to a forward expansion anchor bolt. Background Art
[0002] Expansion bolts are a special type of threaded connector commonly used in the construction field. They consist of a screw and an expansion tube. The tail of the screw is an inverted cone. When the nut is tightened, the screw moves outward, forming a large positive pressure on the outer surface of the expansion tube, thereby forming friction self-locking between the wall, the expansion tube and the cone. However, since the expansion tube is an inverted cone, its expansion direction is toward the inside of the wall, and it is easy to get the thread stripped when pulled upward, which has certain limitations.
[0003] To this end, we have designed a new type of expansion anchor bolt. By designing an expansion head that can expand toward the outside of the wall, the expansion of its end can form a greater pull-out resistance to the expansion bolt. After the expansion part is filled with mortar, the expansion bolt can be effectively connected to the wall, thereby improving the stability and firmness of the expansion anchor bolt. Utility Model Content
[0004] The utility model aims to provide a forward expansion anchor bolt to solve the problems raised in the above-mentioned background technology.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A forward expansion anchor bolt comprises a hollow screw. An expansion head is mounted on the bottom of the hollow screw. The expansion head comprises a hollow expansion seat mounted on the hollow screw. A plurality of expansion claws are evenly arranged on the top of the hollow expansion seat and are located around the hollow screw. A sleeve, a gasket and a nut mounted on the hollow screw are arranged on the top of the expansion claw in sequence. The nut is threadedly connected to the hollow screw.
[0007] As a further preferred solution of the utility model: a grouting hole communicating with the top of the hollow screw is opened in the hollow screw, and a grouting side hole communicating with the grouting hole is opened in the middle of the side wall of the hollow screw.
[0008] As a further preferred solution of the utility model: a plurality of slurry outlets communicating with the interior of the casing are provided at the bottom of the casing.
[0009] As a further preferred solution of the utility model: four expansion claws are evenly arranged.
[0010] As a further preferred solution of the utility model: the top of the expansion claw and the bottom of the sleeve are both provided with corresponding arc surfaces.
[0011] Compared with the prior art, the beneficial effects of the utility model are:
[0012] The expansion anchor bolt is designed with an expansion head. When the nut is turned to move the hollow screw outward, the sleeve and the expansion claw are pressed together, and the sleeve is embedded in the inner side of the expansion claw, causing the expansion claw to deform and expand outward. The expansion direction is toward the outside of the wall, which can form a greater pull-out resistance for the expansion bolt and improve the stability and firmness of the expansion anchor bolt.
[0013] By using a hollow screw and opening a slurry outlet at the bottom of the casing, after the slurry is injected through the grouting hole, the slurry enters the gap between the casing and the hollow screw along the grouting hole and the slurry outlet side hole, and flows out through the slurry outlet to fill the cavity gap between the expansion head, the hollow screw and the wall, thereby achieving an effective connection between the expansion bolt and the wall with high stability.
[0014] In summary, the forward expansion anchor bolt changes the way that the traditional expansion tube expands toward the inside of the wall. Through the cooperation of the expansion claw and the casing, the expansion claw can expand outward, and the expansion direction is toward the outside of the wall, which is opposite to the expansion direction of the traditional expansion tube. It can form a greater pull-out resistance to the expansion bolt, and the grouting is convenient. After grouting, the expansion bolt can be effectively connected to the wall, which effectively improves the stability and firmness of the expansion anchor bolt. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic cross-sectional view of the explosion structure of the forward expansion anchor bolt of the utility model;
[0016] Figure 2 It is a schematic diagram of the front view of the explosion structure of the forward expansion anchor bolt of the utility model;
[0017] Figure 3 It is a cross-sectional schematic diagram of the non-expanded state of the forward expansion anchor bolt of the utility model;
[0018] Figure 4 This is a schematic front view of the non-expanded state of the forward expansion anchor bolt of the utility model;
[0019] Figure 5 It is a schematic diagram of the front view of the expansion state of the forward expansion anchor bolt of the utility model;
[0020] Figure 6 It is a schematic diagram of the expansion state of the forward expansion anchor bolt and the slurry flow direction of the utility model.
[0021] In the figure: 1. hollow screw; 11. grouting hole; 12. grout outlet side hole; 2. expansion head; 21. hollow expansion seat; 22. expansion claw; 3. casing; 31. grout outlet; 4. gasket; 5. nut. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1
[0023] See also Figure 1-6 The present embodiment provides a forward expansion anchor bolt, comprising a hollow screw 1, a grouting hole 11 communicating with the top of the hollow screw 1 is opened in the hollow screw 1, a slurry outlet side hole 12 communicating with the grouting hole 11 is opened in the middle of the side wall of the hollow screw 1, an expansion head 2 is mounted on the bottom of the hollow screw 1, the expansion head 2 comprises a hollow expansion seat 21 mounted on the hollow screw 1, a plurality of expansion claws 22 located around the hollow screw 1 are evenly arranged on the top of the hollow expansion seat 21, and four expansion claws 22 are preferably arranged, and a sleeve 3, a gasket 4 and a nut 5 mounted on the hollow screw 1 are arranged on the top of the expansion claw 22 in sequence, and the nut 5 is threadedly connected to the hollow screw 1, and a plurality of slurry outlets 31 communicating with the inside of the sleeve 3 are opened at the bottom of the sleeve 3, and preferably, the slurry outlets 31 correspond to the expansion claws 22 and are also evenly arranged in four.
[0024] In order to make the bottom of the sleeve 3 more easily embedded in the expansion claw 22, as shown in FIG. Figure 3 As shown, corresponding arc surfaces are provided on the top of the expansion claw 22 and the bottom of the sleeve 3.
[0025] In order to enable those skilled in the art to better understand the present application, the working principle of the forward expansion anchor bolt will be described below:
[0026] like Figure 3 and Figure 4 As shown, this is the state of the anchor bolt when it is not expanded. At this time, the top of the expansion claw 22 is in contact with the bottom of the casing 3. After the anchor bolt is placed in the wall, the nut 5 is rotated to drive the hollow screw 1 to move outward, so that the expansion head 2 squeezes the casing 3, and then the casing 3 is embedded in the inner side of the expansion claw 22. The expansion claw 22 is deformed and expands outward. The state after expansion is as shown in FIG. Figure 5 Then, grout is injected into the anchor bolt through the grouting hole 11, and the grout flow direction is as shown in FIG. Figure 6 As shown, the slurry enters the gap between the casing 3 and the hollow screw 1 along the grouting hole 11 and the slurry outlet side hole 12, and flows out from the slurry outlet 3 at the bottom of the casing 3, filling the cavity between the bottom of the anchor bolt and the wall, thereby achieving a stable connection between the anchor bolt and the wall. The top gasket 4, under the compression of the nut 5, can prevent the slurry from overflowing from the top of the casing 3, thereby playing a sealing role for the casing 3.
[0027] It should be noted that, in actual application, the expansion claw 22 is integrated with the hollow expansion seat 21, and the expansion head 2 and the sleeve 3 are preferably made of stainless steel to have a certain deformation ability. Among them, the hollow expansion seat 21 can be designed as a circular ring structure with a certain thickness, or as a hollow cup-shaped structure with an open bottom. The shape selection is a conventional operation familiar to those skilled in the art, and this application will not be repeated.
[0028] It should be noted that the above embodiments are only specific and clear descriptions of the technical solutions and technical features of the present application. For those skilled in the art, solutions or features that belong to the prior art or common knowledge are not described in detail in the above embodiments.
[0029] In addition, the technical solutions of the present application are not limited to the above-mentioned embodiments. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A forward expansion anchor bolt, characterized in that: The invention comprises a hollow screw (1), wherein an expansion head (2) is mounted on the bottom of the hollow screw (1), wherein the expansion head (2) comprises a hollow expansion seat (21) mounted on the hollow screw (1), wherein a plurality of expansion claws (22) are evenly arranged on the top of the hollow expansion seat (21) and are located on the circumference of the hollow screw (1), wherein a sleeve (3), a gasket (4) and a nut (5) mounted on the hollow screw (1) are arranged in sequence on the top of the expansion claws (22), and the nut (5) is threadedly connected to the hollow screw (1).
2. The forward expansion anchor bolt according to claim 1, characterized in that: A grouting hole (11) communicating with the top of the hollow screw (1) is provided in the hollow screw (1), and a grouting side hole (12) communicating with the grouting hole (11) is provided in the middle of the side wall of the hollow screw (1).
3. The forward expansion anchor bolt according to claim 2, characterized in that: The bottom of the sleeve (3) is provided with a plurality of slurry outlets (31) which are in communication with the interior of the sleeve (3).
4. The forward expansion anchor bolt according to claim 3, characterized in that: Four expansion claws (22) are evenly arranged.
5. The forward expansion anchor bolt according to claim 1, characterized in that: The top of the expansion claw (22) and the bottom of the sleeve (3) are both provided with corresponding arc surfaces.