Self-drilling type hollow grouting anchor rod

Abstract

The utility model relates to the technical field of grouting anchor rods, in particular to a self-drilling type hollow grouting anchor rod which comprises a threaded anchor rod body, and a hole grout stopping assembly is installed at the position, close to the tail end, of the periphery of the threaded anchor rod body. A drill bit is arranged at the front end of the threaded anchor rod body, and a plurality of evenly-distributed through holes are formed in the portion, close to the front end, of the periphery of the threaded anchor rod body. A sealing assembly is installed at the position, close to the tail end, in the threaded anchor rod body, and the sealing assembly is used for sealing the tail end of the threaded anchor rod body when grouting is completed. According to the threaded anchor rod, the sealing assembly is arranged in the threaded anchor rod body, the grouting hole can be sealed in time after grouting is completed, the process that the tail end of the threaded anchor rod body needs to be sealed through a sealing cover is omitted, and therefore slurry is prevented from flowing out of the tail end of the threaded anchor rod body, enough grouting pressure can be kept, and grouting efficiency is improved. And it is ensured that the anchor rod can be fully filled with slurry, and the grouting uniformity and effect are improved.

Description

Technical Field

[0001] This utility model relates to the field of grouting anchor technology, specifically a self-drilling hollow grouting anchor. Background Technology

[0002] Grouting anchors are support tools used in geotechnical engineering, primarily for reinforcing slopes, tunnels, foundation pits, and other structures. Their main feature is their hollow design, allowing mortar or other anchoring agents to be injected into the center of the rod, thus achieving both anchoring and support.

[0003] The hollow design of grouting anchors allows them to function as both grouting pipes and anchors. Grouting anchors typically have built-in threads, eliminating the need for on-site machining and facilitating the installation of accessories such as washers and nuts, thus simplifying the construction process. In use, a drilling rig is used to drill and clean the hole according to the design requirements. The grouting anchor with the anchor head installed is inserted into the drilled hole; a grout stop plug, washer, and nut are installed at the tail of the anchor. Grout or other anchoring agent is injected into the anchor using a grouting machine until grout overflows from the other end of the hole.

[0004] However, existing grouting anchors still have the following shortcomings during use:

[0005] When the mortar overflows from the other end of the hole, the grouting machine is separated from the tail end of the anchor rod. Then, a cap is used to seal the tail end of the anchor rod to prevent the mortar from flowing out. However, there is a certain time interval between disassembling and installing the cap, during which some mortar will leak out from the tail end of the rod, resulting in a decrease in grout filling pressure and affecting the sufficiency of grout filling and the grouting effect. Utility Model Content

[0006] The purpose of this invention is to provide a self-drilling hollow grouting anchor bolt to solve the problems mentioned in the background art.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A self-drilling hollow grouting anchor bolt includes a threaded anchor bolt body, and a hole grouting component is installed on the periphery of the threaded anchor bolt body near the tail end; a drill bit is provided at the front end of the threaded anchor bolt body, and multiple evenly distributed through holes are opened on the periphery of the threaded anchor bolt body near the front end.

[0009] A sealing component is installed near the tail end of the threaded anchor body. The sealing component is used to seal the tail end of the threaded anchor body when grouting is completed.

[0010] Furthermore, the sealing assembly includes a limiting ring and a grouting ring. The grouting ring is fixedly installed on the inner wall of the threaded anchor rod body near the tail end, and the through hole of the grouting ring forms a grouting hole.

[0011] The limiting ring is set in the threaded anchor rod body, the threaded anchor rod body is coaxial with the grouting ring, and a sliding rod is slidably installed through the threaded anchor rod body. A conical plug that mates with the grouting hole is fixedly installed at the end of the sliding rod near the grouting ring, and a stop block is fixedly installed at the end of the sliding rod away from the grouting ring. A spring sleeved on the outside of the sliding rod is fixedly connected between the stop block and the limiting ring.

[0012] A connecting rod is fixedly connected between the outer periphery of the limiting ring and the inner wall of the threaded anchor rod body.

[0013] Furthermore, the conical plug is covered with a rubber layer on its periphery; in the initial state, under the action of the spring's contraction force, the end of the conical plug away from the slide rod extends into the grouting hole, and the grouting ring and the periphery of the conical plug are in elastic compression contact.

[0014] Furthermore, the hole sealing assembly includes a sealing plug, a washer, and a nut sleeved around the threaded anchor rod body; the washer is located between the sealing plug and the nut, and the nut is located on the side of the washer near the tail end of the threaded anchor rod body.

[0015] Both the grout stopper and the gasket are slidably connected to the outer periphery of the threaded anchor body.

[0016] The nut is threadedly connected to the outer periphery of the threaded anchor body, and a washer fitted around the outer periphery of the threaded anchor body is provided between the nut and the washer plate.

[0017] Furthermore, a helical blade is fixedly installed on the periphery of the threaded anchor body at the portion where the through hole is provided.

[0018] The beneficial effects of this utility model are:

[0019] 1. In this utility model, by providing a sealing component in the threaded anchor body, the grouting hole can be sealed immediately after grouting is completed, eliminating the need to seal the tail end of the threaded anchor body with a cap. This prevents the grout from flowing out from the tail end of the threaded anchor body, maintains sufficient grouting pressure, ensures that the grout can fully fill the interior of the anchor, and improves the uniformity and effect of grouting.

[0020] 2. By using spiral blades, this utility model can loosen the soil during drilling and further mix and break up rock blocks, thereby helping to increase drilling speed and drilling depth, thus improving the practicality of this utility model. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a structural schematic diagram of the connection relationship between the closed component and the anchor body in this utility model;

[0024] The accompanying figure is labeled as follows:

[0025] 1-Drill bit, 2-Helical blade, 3-Through hole, 4-Threaded anchor body, 5-Grouting plug, 6-Plate, 7-Washer, 8-Nut, 9-Grouting ring, 10-Grouting hole, 11-Conical plug, 12-Connecting rod, 13-Limiting ring, 14-Sliding rod, 15-Stop block, 16-Spring. Detailed Implementation

[0026] 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.

[0027] Example 1:

[0028] Please see Figure 1 and Figure 2 In this embodiment of the utility model, a self-drilling hollow grouting anchor rod includes a threaded anchor rod body 4, and a hole grouting component is installed on the periphery of the threaded anchor rod body 4 near the tail end; a drill bit 1 is provided at the front end of the threaded anchor rod body 4, and multiple uniformly distributed through holes 3 are opened on the periphery of the threaded anchor rod body 4 near the front end.

[0029] A sealing component is installed near the tail end of the threaded anchor body 4. The sealing component is used to seal the tail end of the threaded anchor body 4 when grouting is completed.

[0030] The sealing component includes a limiting ring 13 and a grouting ring 9. The grouting ring 9 is fixedly installed on the inner wall of the threaded anchor body 4 near the tail end, and the through hole of the grouting ring 9 forms a grouting hole 10.

[0031] The limiting ring 13 is set in the threaded anchor rod body 4. The threaded anchor rod body 4 is coaxial with the grouting ring 9. A sliding rod 14 is slidably installed through the threaded anchor rod body 4. A conical plug 11 that works with the grouting hole 10 is fixedly installed at the end of the sliding rod 14 near the grouting ring 9. A stop block 15 is fixedly installed at the end of the sliding rod 14 away from the grouting ring 9. A spring 16 sleeved on the outside of the sliding rod 14 is fixedly connected between the stop block 15 and the limiting ring 13.

[0032] A connecting rod 12 is fixedly connected between the outer periphery of the limiting ring 13 and the inner wall of the threaded anchor rod body 4.

[0033] The conical plug 11 is covered with a rubber layer on its outer periphery. In the initial state, under the contraction force of the spring 16, the end of the conical plug 11 away from the slide bar 14 extends into the grouting hole 10, and the grouting ring 9 and the outer periphery of the conical plug 11 are in elastic compression contact.

[0034] The hole sealing assembly includes a sealing plug 5, a pad 6, and a nut 8, which are sleeved around the threaded anchor rod body 4; the pad 6 is located between the sealing plug 5 and the nut 8, and the nut 8 is located on the side of the pad 6 near the tail end of the threaded anchor rod body 4.

[0035] The grout stop plug 5 and the gasket 6 are both slidably connected to the outer periphery of the threaded anchor body 4;

[0036] The nut 8 is threadedly connected to the outer periphery of the threaded anchor rod body 4, and a washer 7 is provided between the nut 8 and the washer plate 6, which is sleeved on the outer periphery of the threaded anchor rod body 4.

[0037] When using this utility model:

[0038] Install the grouting anchor rod as a whole on the drilling rig, and then introduce compressed air into the inner hole of the threaded anchor rod body 4 to ensure that the threaded anchor rod body 4 is not blocked; start the equipment and move it to the surface layer to be drilled, rotate and drill, and after reaching the specified drilling depth, switch to grouting machine to inject grout into the threaded anchor rod body 4 and rotate it up and down to stir the grout, so as to achieve precise grouting at each position of the hole and strengthen the stability of the hole.

[0039] During the grouting process, the grout enters the grouting hole 10 and squeezes the conical plug 11, making the grouting hole 10 open. This allows the grout to enter the threaded anchor body 4 and fill the hole through the through hole 3. During this process, the spring 16 is in a stretched state. When grout overflows from the hole, the grouting stops. At this time, the spring 16 drives the slide rod 14 to reset, so that the conical plug 11 closes the grouting hole 10.

[0040] Therefore, in this utility model, by providing a sealing component in the threaded anchor body 4, the grouting hole 10 can be sealed immediately after grouting is completed, eliminating the need to seal the tail end of the threaded anchor body 4 with a cap, thereby preventing the grout from flowing out from the tail end of the threaded anchor body 4, maintaining sufficient grouting pressure, ensuring that the grout can fully fill the interior of the anchor, and improving the uniformity and effect of grouting.

[0041] Example 2:

[0042] Please see Figure 1 Based on Example 1, a spiral blade 2 is fixedly installed on the outer periphery of the threaded anchor body 4 in the part with the through hole 3.

[0043] By using the spiral blades 2, the soil can be loosened during drilling, and the rock blocks can be further stirred and broken up, thereby helping to increase the drilling speed and drilling depth, and improving the practicality of this utility model.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A self-drilling hollow grouting anchor bolt, comprising a threaded anchor bolt body (4), wherein a hole-stopping grouting component is installed on the periphery of the threaded anchor bolt body (4) near its tail end; characterized in that, The threaded anchor body (4) is provided with a drill bit (1) at its front end, and multiple uniformly distributed through holes (3) are opened on the periphery of the threaded anchor body (4) near the front end. A sealing component is installed near the tail end of the threaded anchor body (4), which is used to seal the tail end of the threaded anchor body (4) when grouting is completed. The sealing assembly includes a limiting ring (13) and a grouting ring (9). The grouting ring (9) is fixedly installed on the inner wall of the threaded anchor body (4) near the tail end. The through hole of the grouting ring (9) forms a grouting hole (10). The limiting ring (13) is set in the threaded anchor body (4). The threaded anchor body (4) is coaxial with the grouting ring (9). A sliding rod (14) is slidably installed through the threaded anchor body (4). A conical plug (11) that works with the grouting hole (10) is fixedly installed at the end of the sliding rod (14) near the grouting ring (9). A stop block (15) is fixedly installed at the end of the sliding rod (14) away from the grouting ring (9). A spring (16) sleeved on the outside of the sliding rod (14) is fixedly connected between the stop block (15) and the limiting ring (13). A connecting rod (12) is fixedly connected between the outer periphery of the limiting ring (13) and the inner wall of the threaded anchor body (4).

2. The self-drilling hollow grouting anchor bolt according to claim 1, characterized in that, The conical plug (11) is covered with a rubber layer on its periphery; in the initial state, under the contraction force of the spring (16), the end of the conical plug (11) away from the slide bar (14) extends into the grouting hole (10), and the grouting ring (9) and the periphery of the conical plug (11) are in elastic compression contact.

3. The self-drilling hollow grouting anchor bolt according to claim 1, characterized in that, The hole sealing assembly includes a sealing plug (5), a pad (6), and a nut (8) sleeved around the threaded anchor body (4); the pad (6) is located between the sealing plug (5) and the nut (8), and the nut (8) is located on the side of the pad (6) near the tail end of the threaded anchor body (4); The grout stopper (5) and the pad (6) are both slidably connected to the periphery of the threaded anchor body (4); The nut (8) is threadedly connected to the outer periphery of the threaded anchor body (4), and a washer (7) is provided between the nut (8) and the pad (6) and sleeved on the outer periphery of the threaded anchor body (4).

4. A self-drilling hollow grouting anchor bolt according to claim 1, characterized in that, A spiral blade (2) is fixedly installed on the periphery of the threaded anchor body (4) in the part where the through hole (3) is opened.

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