Multi-section expansion bolt with grouting holes

Abstract

The utility model discloses a multi-section expansion bolt with a grouting hole, which belongs to the technical field of expansion bolts and comprises a sleeve inserted into a mounting surface and a sleeve hole formed in the sleeve, a screw is connected in the sleeve hole in the sleeve in a penetrating manner, a bolt head is fixedly mounted on the upper end face of the screw, and a grouting hole is formed in the bolt head. Three sets of internal thread lantern rings are connected to the outer portion of the screw in a sleeving mode, and the outer portions of the internal thread lantern rings and the sleeve are each provided with an annular groove for increasing friction force inserted into a mounting face. An expansion mechanism which can be unfolded and supported on a mounting surface is connected between the sleeve and the three groups of internal thread lantern rings; the expansion bolt is provided with the multiple sections of expansion mechanisms, the multiple sections of expansion mechanisms can be synchronously bent and unfolded under transmission of the screw, and the installation stability is high.

Description

Technical Field

[0001] This utility model relates to the field of expansion bolt technology, specifically a multi-section expansion bolt with grouting holes. Background Technology

[0002] Expansion bolts fix objects to walls or other structures through the principle of expansion, providing stable support. They are widely used in construction, decoration, and equipment installation. During installation, the bolts cause the surface members to tilt and unfold inside, thereby reinforcing the installation.

[0003] For example, patent CN215673076U discloses a fast-expanding countersunk bolt with anti-loosening design, comprising a countersunk bolt and a metal sleeve. A hexagonal nut is rotatably connected to the threaded section of the countersunk bolt, and a force-bearing plate is welded to the end of the threaded section. A connecting post is welded to the end of the countersunk bolt away from the force-bearing plate, and a screw is welded to the end of the connecting post away from the countersunk bolt. A support end is coaxially mounted on the screw and the connecting post. By pulling the countersunk bolt outward, the countersunk bolt moves outward, while the internal metal sleeve remains stationary. The screw moves outward along with the countersunk bolt, reducing the rotation angle between the first and second connecting arms, thus preventing it from falling out and holding the bolt in place in the borehole. Simultaneously, the connecting ring drives the third connecting arm to push the metal sleeve outward, achieving the purpose of expansion and playing a double fixing role. Some existing expansion bolts only have one expansion structure. After the expansion structure is unfolded and loosens from the mounting surface, the installation stability of the entire bolt is affected, which is not conducive to the long-term stable installation of auxiliary equipment. In addition, some expansion bolt auxiliary equipment requires secondary grouting after installation to enhance the connection strength and stability between the equipment and the foundation. Grouting holes need to be reserved inside the expansion bolt. However, during the installation process of the expansion bolt into the mounting surface, the matrix in the mounting surface is easy to enter the grouting hole and form a blockage, which is not conducive to subsequent grouting operations.

[0004] To address the aforementioned issues, there is an urgent need for innovative designs based on the existing expansion bolts. Utility Model Content

[0005] The purpose of this utility model is to provide a multi-section expansion bolt with grouting holes to solve the problem mentioned in the background art that some expansion bolts only have one section of expansion structure. After the expansion structure is unfolded and loosens with the mounting surface, the installation stability of the entire bolt is affected, which is not conducive to the long-term stable installation of auxiliary equipment.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-section expansion bolt with grouting holes, comprising a sleeve inserted into the mounting surface and a sleeve hole formed in the sleeve, wherein a screw rod is connected through the sleeve hole in the sleeve, a bolt head is fixedly installed on the upper end face of the screw rod, and three sets of internally threaded collars are sleeved and connected to the outside of the screw rod, and both the internally threaded collars and the outside of the sleeve are provided with annular grooves to increase the friction force in the mounting surface; an expansion mechanism that can be unfolded and supported on the mounting surface is connected between the sleeve and the three sets of internally threaded collars.

[0007] Preferably, the expansion mechanism includes an expansion rod fixed between the sleeve and the adjacent internal threaded collar, and multiple expansion rods are arranged at equal angles along the circumference of the internal threaded collar; the sleeve and the internal threaded collar are coaxially distributed in the longitudinal direction.

[0008] Preferably, the expansion rod is bent with an upper bend groove at the top, a lower bend groove at the bottom, and a middle bend groove at the middle.

[0009] Preferably, the expansion rod has symmetrical slots on both sides of the central bend, and an insert is fixedly connected to the expansion rod near the central bend.

[0010] Preferably, the screw has a first-level external thread, a second-level external thread, and a third-level external thread sequentially formed from top to bottom on its outer surface. The pitch of the first-level external thread, the second-level external thread, and the third-level external thread increases sequentially, and three internal threaded collars are respectively threaded onto the outside of the first-level external thread, the second-level external thread, and the third-level external thread.

[0011] Preferably, the screw is further provided with a grouting pre-reservation mechanism for auxiliary grouting.

[0012] Preferably, the grouting pre-reservation mechanism includes grouting holes opened inside the bolt head and the screw, and an elastic sheet and a paper film are fixed in the grouting holes inside the screw.

[0013] Multiple elastic plates are arranged at equal angles along the circumference inside the screw. The elastic plates are inclined inside the screw, and the circumferentially distributed elastic plates are positioned above the paper film.

[0014] Compared with the prior art, the beneficial effects of this utility model are: the multi-section expansion bolt with grouting holes is installed in the mounting surface by means of a sleeve and a screw, and the screw is provided with a multi-section internal threaded collar and an expansion mechanism on the outside, so that the expansion bolt can be stably assembled in the mounting surface.

[0015] Furthermore, an expansion mechanism that can be deployed and supported on the mounting surface is connected between the sleeve and the three sets of internal threaded collars. The rotation of the screw controls the internal threaded collars to move upward under the threaded transmission. At this time, the expansion rod bends autonomously along the direction of the upper bend, lower bend and middle bend, and the expansion rod unfolds and supports in the mounting surface, thereby increasing the stability of the installation.

[0016] The screw has primary, secondary, and tertiary external threads. Under different pitch transmissions, the displacement of the corresponding three sets of internal thread collars is different, thus ensuring that the multi-section expansion mechanism can bend and unfold.

[0017] Furthermore, the screw is equipped with a grouting pre-reserved mechanism to assist grouting, and grouting holes are provided inside the screw and bolt head to assist subsequent grouting operations.

[0018] The grouting hole is equipped with elastic sheets and paper membranes, which can protect the inside of the grouting hole and prevent the matrix inside the mounting surface from entering the grouting hole and causing blockage during the installation of expansion bolts. In addition, the elastic sheets and paper membranes are easy to penetrate, and a tubular workpiece can be inserted into the grouting hole before grouting to maintain the unobstructed flow of the grouting hole. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the sleeve of this utility model.

[0020] Figure 2 This is a three-dimensional structural diagram of the internal threaded collar of this utility model.

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the annular groove of this utility model.

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the screw of this utility model.

[0023] Figure 5 This is a schematic diagram of the initial state structure of the expansion rod of this utility model.

[0024] Figure 6 This is a schematic diagram of the expansion rod of this utility model in a bent state.

[0025] Figure 7 This is a schematic diagram of the three-dimensional structure of the insert of this utility model.

[0026] Figure 8 This is a schematic diagram of the cross-sectional structure of the screw of this utility model.

[0027] Figure 9 This is a schematic diagram of the three-dimensional structure of the paper film of this utility model.

[0028] In the diagram: 1. Sleeve; 2. Sleeve hole; 3. Screw; 4. Bolt head; 5. Internal threaded collar; 6. Ring groove; 7. Expansion rod; 71. Upper bend groove; 72. Lower bend groove; 73. Middle bend groove; 74. Cut groove; 8. First-grade external thread; 9. Second-grade external thread; 10. Third-grade external thread; 11. Insert; 12. Grouting hole; 13. Elastic sheet; 14. Paper film. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1: Please refer to Figures 1-9 The present invention provides the following technical solution: a multi-section expansion bolt with grouting holes, comprising a sleeve 1 inserted into the mounting surface and a sleeve hole 2 opened in the sleeve 1, a screw 3 being connected through the sleeve hole 2 in the sleeve 1, a bolt head 4 being fixedly installed on the upper end face of the screw 3, and three sets of internal threaded collars 5 being sleeved and connected to the outside of the screw 3, and both the internal threaded collars 5 and the outside of the sleeve 1 having annular grooves 6 to increase the friction in the mounting surface; an expansion mechanism that can be unfolded and supported on the mounting surface is connected between the sleeve 1 and the three sets of internal threaded collars 5.

[0031] The expansion mechanism includes an expansion rod 7 fixed between the sleeve 1 and the adjacent internal threaded collar 5. Multiple expansion rods 7 are arranged at equal angles along the circumference of the internal threaded collar 5. The sleeve 1 and the internal threaded collar 5 are coaxially distributed in the longitudinal direction.

[0032] The expansion rod 7 has an upper bend groove 71 at the top, a lower bend groove 72 at the bottom, and a middle bend groove 73 at the middle.

[0033] The expansion rod 7 has symmetrical slots 74 on both sides of the middle bend 73, and the expansion rod 7 has a fixed insert 11 near the middle bend 73.

[0034] The screw 3 has a first-level external thread 8, a second-level external thread 9 and a third-level external thread 10 sequentially opened from top to bottom on its exterior. The pitch of the first-level external thread 8, the second-level external thread 9 and the third-level external thread 10 increases sequentially, and three internal thread collars 5 are respectively threaded on the exterior of the first-level external thread 8, the second-level external thread 9 and the third-level external thread 10.

[0035] Before installation, make a hole on the mounting surface to fit the sleeve 1, insert the sleeve 1 into the mounting surface, and control the screw 3 to rotate by the tool. Under the thread transmission between the screw 3 and the internal threaded collar 5, the internal threaded collar 5 moves upward on the screw 3. At this time, the expansion mechanism connected between the internal threaded collar 5 and the sleeve 1 bends and unfolds.

[0036] The expansion rod 7 in the expansion mechanism bends and unfolds along the directions of the upper bend groove 71, the lower bend groove 72 and the middle bend groove 73. After unfolding, the expansion rod 7 is supported inside the mounting surface, which effectively improves the installation stability. After the expansion rod 7 unfolds, the insert 11 on the side unfolds and is inserted into the mounting surface, which further improves the installation stability. Since the screw 3 has a first-level external thread 8, a second-level external thread 9 and a third-level external thread 10 with different pitches, the displacement of the three sets of internal thread collars 5 is different when it rotates. The displacement of the internal thread collars 5 gradually increases from top to bottom, so that the expansion rods 7 connected between adjacent internal thread collars 5 can be bent and unfolded. The multi-section expansion rod 7 can effectively improve the stability of the expansion bolt assembly in the mounting surface.

[0037] Example 2: Based on Example 1, a grouting pre-reservation mechanism is also disclosed, the specific structure of which is as follows: A grouting pre-reservation mechanism for auxiliary grouting is also provided inside the screw 3. The grouting pre-reservation mechanism includes grouting holes 12 opened inside the bolt head 4 and the screw 3. Elastic sheets 13 and paper films 14 are fixed in the grouting holes 12 inside the screw 3. Multiple elastic sheets 13 are arranged at equal angles along the circumferential direction inside the screw 3. The elastic sheets 13 are inclined inside the screw 3, and the circumferentially distributed elastic sheets 13 are positioned above the paper films 14.

[0038] After the expansion bolts are installed, grouting can be performed into the installation surface through the grouting hole 12. Since the grouting hole 12 is equipped with a paper diaphragm 14 and an elastic sheet 13, it can prevent the matrix in the installation surface from blocking the grouting hole 12 and keep the inside of the grouting hole 12 unobstructed. Before grouting, a tubular tool is inserted into the grouting hole 12. The tubular tool contacts the elastic sheet 13 and pushes the multiple circumferentially distributed elastic sheets 13 to deform elastically. The tubular tool also breaks through the paper diaphragm 14, so that the inside and outside of the grouting hole 12 are unobstructed, so as to assist in completing the grouting operation.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-section expansion bolt with a grouting hole, comprising a sleeve (1) inserted into the mounting surface and a hole (2) formed in the sleeve (1), characterized in that: A screw (3) is connected through the sleeve hole (2) in the sleeve (1). A bolt head (4) is fixedly installed on the upper end face of the screw (3). Three sets of internal threaded collars (5) are sleeved and connected to the outside of the screw (3). Both the internal threaded collars (5) and the outside of the sleeve (1) are provided with ring grooves (6) to increase the friction in the insertion mounting surface. An expansion mechanism that can be deployed and supported on the mounting surface is connected between the sleeve (1) and the three sets of internal threaded collars (5).

2. A multi-section expansion bolt with grouting holes according to claim 1, characterized in that: The expansion mechanism includes an expansion rod (7) fixed between the sleeve (1) and the adjacent internal threaded collar (5), and multiple expansion rods (7) are arranged at equal angles along the circumference of the internal threaded collar (5); The sleeve (1) and the internal threaded collar (5) are longitudinally coaxial.

3. A multi-section expansion bolt with grouting holes according to claim 2, characterized in that: The expansion rod (7) is bent at the upper position with an upper bend groove (71), bent at the lower position with a lower bend groove (72), and bent at the middle position with a middle bend groove (73).

4. A multi-section expansion bolt with grouting holes according to claim 3, characterized in that: The expansion rod (7) has symmetrical slots (74) on both sides of the middle bend (73) and a insert (11) is fixedly connected to the expansion rod (7) near the middle bend (73).

5. A multi-section expansion bolt with grouting holes according to claim 2, characterized in that: The screw (3) has a first-level external thread (8), a second-level external thread (9) and a third-level external thread (10) sequentially opened from top to bottom on the outside. The pitch of the first-level external thread (8), the second-level external thread (9) and the third-level external thread (10) increases sequentially, and three internal thread collars (5) are respectively threaded on the outside of the first-level external thread (8), the second-level external thread (9) and the third-level external thread (10).

6. A multi-section expansion bolt with grouting holes according to claim 1, characterized in that: The screw (3) is also equipped with a grouting pre-reservation mechanism for auxiliary grouting.

7. A multi-section expansion bolt with grouting holes according to claim 6, characterized in that: The grouting pre-reservation mechanism includes grouting holes (12) opened inside the bolt head (4) and the screw (3), and elastic sheet (13) and paper film sheet (14) are fixed in the grouting holes (12) inside the screw (3). Multiple elastic plates (13) are arranged at equal angles along the circumference inside the screw (3). The elastic plates (13) are inclined inside the screw (3), and the circumferentially distributed elastic plates (13) are positioned above the paper film (14).

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