A grouting screw anchor foundation

Abstract

The utility model provides a kind of grouting screw anchor foundation, including anchor rod body, grouting system and guiding mechanism, anchor rod body is hollow tubular structure, anchor rod body top end is equipped with connecting flange, anchor rod body bottom end is closed, anchor rod body axially spaced distribution spiral vane group, spiral vane group gradually decreases along the direction of drilling, grouting system is installed in anchor rod body, the utility model is connected with the drilling equipment by connecting flange, guiding mechanism guides anchor body and drills along preset direction, spiral vane group can adapt to the drilling resistance of different soil layers due to the design of inclination gradual change, reduce construction energy consumption, after drilling to design depth, by built-in grouting pipe injection cement slurry or chemical slurry, slurry is evenly distributed to each group grouting hole by annular shunt cavity, while the flow guide protrusion of lower surface of spiral vane guides slurry and spreads along vane, fills the gap between the soil around anchor body and penetrates to deep soil, integrated reinforcing structure, after slurry solidification, anchor body is through the mechanical occlusion of spiral vane and the cementation effect of slurry, jointly provide pullout resistance and bearing capacity, significantly improve foundation stability.

Description

Technical Field

[0001] This utility model relates to the field of spiral anchor technology, and in particular to a grouting spiral anchor foundation. Background Technology

[0002] In foundation engineering, helical anchor foundations are widely used for fixing lightweight structures due to their advantages such as convenient construction and minimal site disturbance. Traditional helical anchor foundations mainly rely on the friction between the helical blades and the soil to provide pull-out resistance and bearing capacity. However, under adverse geological conditions such as soft soil and sandy soil, the single mechanical interlocking action is difficult to meet the high bearing capacity requirements, and problems such as anchor slippage and foundation instability are prone to occur.

[0003] While existing grouting-type spiral anchors attempt to enhance anchoring through grouting, they suffer from defects such as unreasonable grouting channel design, uneven grout diffusion, and loose bonding between the anchor body and the grout. Some structures only have grouting holes at the end of the anchor rod, causing the grout to concentrate at the bottom of the anchor body and failing to evenly fill the gaps in the soil around the anchor body. Other designs lack grout guiding structures, making it easy for the grout to accumulate on the surface of the anchor body and difficult to penetrate into deeper soil layers, thus reducing the efficiency of grouting reinforcement. At the same time, the blades of traditional spiral anchors are mostly at a fixed angle, resulting in large differences in drilling resistance in different soil layers, high construction energy consumption, and insufficient overall rigidity of the anchor body, making it prone to bending deformation under long-term stress.

[0004] Therefore, it is essential to provide a grouting spiral anchor foundation to address the shortcomings of existing technologies. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a grouting spiral anchor foundation. This invention connects the anchor body to the drilling equipment via a connecting flange. A guiding mechanism guides the anchor body to drill along a preset direction. The spiral blade assembly, due to its gradually changing inclination angle design, can adapt to the drilling resistance of different soil layers, reducing construction energy consumption. After drilling to the designed depth, cement grout or chemical grout is injected through the built-in grouting pipe. The grout is evenly distributed to each group of grouting holes through an annular distribution cavity. Simultaneously, the guide protrusions on the lower surface of the spiral blades guide the grout to diffuse along the blades, filling the gaps in the soil around the anchor body and penetrating into the deeper soil layers. This integrated reinforcement structure, after the grout solidifies, provides pull-out resistance and bearing capacity through the mechanical interlocking of the spiral blades and the bonding effect of the grout, significantly improving foundation stability.

[0006] The above-mentioned objectives of this utility model are achieved through the following technical means.

[0007] A grouting spiral anchor foundation is provided, including an anchor body, a grouting system and a guiding mechanism. The anchor body is a hollow tubular structure with a connecting flange at the top and a closed bottom. Spiral blade groups are axially spaced on the anchor body, and the spiral blade groups gradually decrease in size along the drilling direction. A grouting system is installed inside the anchor body. The grouting system includes a built-in grouting pipe and an annular diversion cavity. The built-in grouting pipe is coaxially arranged inside the anchor body, and the annular diversion cavity is opened on the side wall of the anchor body and is connected to the built-in grouting pipe. The guide mechanism is fixed to the bottom end of the anchor body.

[0008] Specifically, the guiding mechanism includes a guide cone, which is installed at the bottom of the anchor bolt body, and two sets of stabilizing wings are installed on the guide cone.

[0009] Specifically, the helical blade assembly includes at least three helical blades, which are formed by stamping wear-resistant steel plates and have the same helical direction.

[0010] Specifically, grouting holes are opened on the side wall of the anchor bolt body, and the grouting holes are evenly distributed circumferentially on the anchor bolt body.

[0011] Specifically, the spiral blades are equipped with flow-guiding protrusions, which are evenly distributed on the lower surface of the spiral blades.

[0012] This utility model connects the anchor body to the drilling equipment via a connecting flange. The guiding mechanism guides the anchor body to drill in a preset direction. Due to the gradually changing inclination angle design of the spiral blade assembly, it can adapt to the drilling resistance of different soil layers, reducing construction energy consumption. After drilling to the designed depth, cement grout or chemical grout is injected through the built-in grouting pipe. The grout is evenly distributed to each group of grouting holes through the annular distribution cavity. At the same time, the guide protrusions on the lower surface of the spiral blade guide the grout to spread along the blade, filling the gaps in the soil around the anchor body and penetrating into the deep soil. The integrated reinforcement structure, after the grout solidifies, the anchor body provides pull-out resistance and bearing capacity through the mechanical interlocking of the spiral blade and the bonding effect of the grout, significantly improving the stability of the foundation. Attached Figure Description

[0013] The present invention will be further described with reference to the accompanying drawings, but the content of the drawings does not constitute any limitation on the present invention.

[0014] Figure 1 This is a three-dimensional view of the overall structure of a grouting spiral anchor foundation according to this utility model.

[0015] Figure 2 This is a front view of a grouting spiral anchor foundation according to this utility model.

[0016] from Figures 1 to 2 Including: 1. Anchor bolt body; 2. Helical blade assembly; 3. Grouting system; 4. Guide mechanism; 5. Connecting flange; 6. Grouting hole; 7. Built-in grouting pipe; 8. Annular diversion cavity; 9. Guide protrusion; 10. Guide cone; 11. Stabilizing wing. Detailed Implementation

[0017] The present invention will be further described in conjunction with the following embodiments.

[0018] Example 1. like Figure 1-2 As shown, a grouting spiral anchor foundation includes an anchor body 1, a grouting system 3, and a guide mechanism 4. The anchor body 1 is a hollow tubular structure. A connecting flange 5 is provided at the top of the anchor body 1, and the bottom of the anchor body 1 is closed. Spiral blade groups 2 are axially spaced on the anchor body 1. The spiral blade groups 2 gradually decrease in size along the drilling direction. The grouting system 3 is installed inside the anchor body 1.

[0019] The grouting system 3 includes a built-in grouting pipe 7 and an annular diversion cavity 8. The built-in grouting pipe 7 is coaxially arranged inside the anchor body 1. The annular diversion cavity 8 is opened on the side wall of the anchor body 1 and is connected to the built-in grouting pipe 7. The guide mechanism 4 is fixed to the bottom end of the anchor body 1.

[0020] The grouting system 3 includes an internal grouting pipe 7 and an annular diversion cavity 8. The internal grouting pipe 7 is a galvanized steel pipe and is coaxially fixed inside the anchor body 1. The annular diversion cavity 8 is an annular groove opened on the side wall of the anchor body 1. A set of annular diversion cavities 8 is set every 40cm along the axial direction of the anchor. Grouting holes 6 are opened on the side wall of the anchor body 1 and are evenly distributed around the anchor body 1. The annular diversion cavity 8 corresponds one-to-one with the grouting holes 6. The annular diversion cavity 8 is connected to the internal grouting pipe 7 to realize the diversion of grout. The guiding mechanism 4 includes a guide cone 10, which is installed at the bottom of the anchor body 1, and two sets of stabilizing wings 11 are installed on the guide cone 10.

[0021] The guiding mechanism 4 includes a guide cone 10 and a stabilizing wing 11. The guide cone 10 is a conical structure forged from 45# steel. The guide cone 10 is fixed to the bottom center of the anchor body 1 by welding. The stabilizing wing 11 consists of two rectangular Q235 steel plates. The stabilizing wing 11 is symmetrically welded to both sides of the guide cone 10 and is parallel to the axis of the anchor body 1. It is used to control the drilling direction and reduce the anchor body deviation.

[0022] The helical blade assembly 2 includes at least 3 helical blades, which are formed by stamping wear-resistant steel plates and have the same helical direction.

[0023] The spiral blade is equipped with flow guiding protrusions 9, which are evenly distributed on the lower surface of the spiral blade. The flow guiding protrusions 9 are triangular truncated pyramid structures with a height of 6mm. They are welded and fixed at intervals of 50mm along the spiral direction of the lower surface of the spiral blade to guide the slurry to diffuse along the blade.

[0024] This utility model connects the anchor body 1 to the drilling equipment via a connecting flange 5. The guiding mechanism 4 guides the anchor body to drill along a preset direction. The spiral blade assembly 2, due to its gradually changing inclination angle design, can adapt to the drilling resistance of different soil layers, reducing construction energy consumption. After drilling to the designed depth, cement grout or chemical grout is injected through the built-in grouting pipe 7. The grout is evenly distributed to each group of grouting holes 6 through the annular distribution cavity 8. At the same time, the guide protrusions 9 on the lower surface of the spiral blades guide the grout to spread along the blades, filling the gaps in the soil around the anchor body and penetrating into the deep soil. The integrated reinforcement structure, after the grout solidifies, the anchor body, through the mechanical interlocking of the spiral blades and the bonding effect of the grout, jointly provides pull-out resistance and bearing capacity, significantly improving the stability of the foundation.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A grouting spiral anchor foundation, characterized in that: The anchor bolt body includes an anchor bolt body, a grouting system, and a guiding mechanism. The anchor bolt body is a hollow tubular structure. The top of the anchor bolt body is provided with a connecting flange, and the bottom of the anchor bolt body is closed. The anchor bolt body has spiral blade groups distributed axially at intervals. The spiral blade groups gradually decrease in size along the drilling direction. The grouting system is installed inside the anchor bolt body. The grouting system includes a built-in grouting pipe and an annular diversion cavity. The built-in grouting pipe is coaxially disposed inside the anchor body. The annular diversion cavity is opened on the side wall of the anchor body and is connected to the built-in grouting pipe. The guide mechanism is fixed to the bottom end of the anchor body.

2. The grouting spiral anchor foundation according to claim 1, characterized in that: The guiding mechanism includes a guide cone, which is installed at the bottom of the anchor body, and two sets of stabilizing wings are installed on the guide cone.

3. A grouting spiral anchor foundation according to claim 2, characterized in that: The helical blade assembly includes at least three helical blades, which are formed by stamping wear-resistant steel plates and have the same helical direction.

4. A grouting spiral anchor foundation according to claim 3, characterized in that: Grouting holes are provided on the side wall of the anchor bolt body, and the grouting holes are evenly distributed circumferentially on the anchor bolt body.

5. A grouting spiral anchor foundation according to claim 4, characterized in that: The spiral blade is equipped with flow-guiding protrusions, which are evenly distributed on the lower surface of the spiral blade.

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