Grouting steel spiral pile

Abstract

The utility model discloses a kind of grouting steel spiral piles, including steel pipe, base layer and grouting pipe;Steel pipe extends to the inside of base layer, and the inside of steel pipe is provided with cavity, and steel spiral pile machine is used to rotate and drill into base layer with steel pipe;The utility model injects cement slurry to the surrounding base layer of steel pipe by grouting pipe, and cement slurry can effectively reinforce surrounding soil after solidification, so that steel pipe, steel blade and reinforced soil work together, meet the demand of higher bearing capacity when pile length, wall thickness or diameter is limited;Through the cooperation of the sealing structure on the surface of grouting plug, air pipe and sealing air bag, the gap between grouting plug and grouting pipe can be effectively filled, and the matching effect of the inner wall sealing cavity of grouting pipe is added, which reduces the leakage of cement slurry during grouting process, ensures the stability of grouting pressure and improves the reinforcement effect;With the help of steel spiral pile machine and its own steel blade and cone cap, steel pipe can quickly rotate and drill into base layer, reducing cumbersome steps and improving efficiency.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering technology, specifically to a grouting steel spiral pile. Background Technology

[0002] Ordinary steel spiral piles are a type of small-tonnage vertical load-bearing piles. The pile body is made of seamless steel pipe, and the pile diameter, wall thickness, length, and steel blades can be determined comprehensively based on soil conditions and vertical bearing capacity requirements.

[0003] Currently, ordinary steel spiral piles are usually composed of steel pipes and steel blades fixed on the outer wall of the steel pipes. During construction, they are rotated and drilled into the base soil by a spiral pile machine. They rely on the friction between the steel pipes, steel blades and the soil and the bearing capacity of the soil itself to withstand vertical and horizontal forces.

[0004] However, in the application of ordinary steel spiral piles, their bearing capacity depends entirely on the strength of the pile material itself and the degree of bonding with the surrounding original soil. When the strength of the base soil is low (such as soft soil, sandy soil, etc.), the original soil is unable to provide sufficient friction and support, resulting in limited vertical and horizontal bearing capacity of the pile. To meet higher bearing capacity requirements, it is often necessary to increase the pile length, wall thickness, or diameter. This not only significantly increases material costs and construction difficulty, but may also be limited by factors such as construction site space and geological conditions, making it difficult to achieve the expected bearing effect when the pile length, wall thickness, or diameter is limited. At the same time, due to the lack of an effective sealing structure, if grouting reinforcement is attempted later, cement grout leakage is very likely to occur, making it impossible to guarantee stable grouting pressure. This results in a limited diffusion range of cement grout, making it difficult to effectively reinforce the surrounding soil and further affecting the overall bearing performance of the pile.

[0005] In view of this, we have introduced a grouting steel spiral pile. Utility Model Content

[0006] The purpose of this utility model is to provide a grouting steel helical pile to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a grouting steel helical pile, comprising: a steel pipe, a base layer, and a grouting pipe; The steel pipe extends into the base layer, and a cavity is opened inside the steel pipe. A steel spiral pile driver is used to rotate and drill the steel pipe into the base layer. The grouting pipe extends into the interior of the steel pipe, and the pipe wall of the steel pipe is provided with several evenly distributed steel blades for screwing into the base layer at equal intervals, and the pipe wall of the steel pipe is provided with several evenly distributed grout outlet holes at the bottom of the steel blades. The top end of the steel pipe is equipped with a grout stopper for sealing. The surface of the grout stopper is equipped with a sealing structure to increase the sealing performance. The air pipe and the sealing air bladder of the sealing structure are used together to allow gas to enter the sealing air bladder and fill the sealing air bladder to increase the sealing performance between the grout stopper and the grouting pipe.

[0008] Preferably, the sealing structure includes a placement cavity for placing a sealing airbag inside the grout stopper, an air tube connected to the top of the sealing airbag and the top of the air tube extending to the outside of the grout stopper, and the sealing airbag connected to the inside of the placement cavity.

[0009] Preferably, the inside of the stop plug is provided with an installation groove for placing the air pipe, and the surface of the air pipe is provided with a valve for controlling the opening and closing of the air pipe.

[0010] Preferably, the inner wall of the grouting pipe has a sealing cavity for matching and installing the sealing airbag.

[0011] Preferably, one end of the steel pipe is reinforced with injected cement grout to strengthen the soil around the steel pipe, which together with the steel pipe and steel blades bears the vertical force. There is one grouting pipe, which is pulled out after grouting is completed.

[0012] Preferably, the grouting pipe is located at the center of the steel pipe, and the grouting pipe is movably connected within the steel pipe.

[0013] Preferably, the bottom of the steel pipe is provided with a conical cap.

[0014] Compared with the prior art, the beneficial effects of this utility model are: (1) Cement grout is injected into the base layer around the steel pipe through the grouting pipe. After the cement grout solidifies, it can effectively reinforce the surrounding soil, so that the steel pipe, steel blades and reinforced soil work together. Compared with ordinary steel spiral piles, it can significantly improve the vertical bearing capacity and horizontal bearing capacity under the same size, and meet the demand for higher bearing capacity when the pile length, wall thickness or diameter is limited. (2) The sealing structure on the surface of the grout stop plug, through the cooperation of the air pipe and the sealing air bladder, can effectively fill the gap between the grout stop plug and the grouting pipe. In addition, the matching effect of the sealing cavity on the inner wall of the grouting pipe reduces the leakage of cement grout during the grouting process, ensures the stability of the grouting pressure, and ensures that the cement grout can fully diffuse to the predetermined range, thereby improving the reinforcement effect. (3) By using the steel pipe and the steel spiral pile driver and its own steel blades and cone cap, it can quickly rotate and drill into the base layer, reducing the cumbersome steps of traditional pile foundation construction. The grouting pipe is a movable connection and there is only one pipe. After grouting, it can be easily pulled out, which simplifies the construction process and improves the construction efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the structure of this utility model; Figure 3 This is a schematic diagram of the structure of the grout stopper of this utility model when connected to a steel pipe; Figure 4 This is a side sectional structural diagram of the grouting pipe, grout stopper, and sealing structure of this utility model. Figure 5 This is a schematic diagram of the structure when the grout stopper and the sealing airbag of this utility model are connected.

[0016] In the diagram: 1. Grouting pipe; 2. Grout stop plug; 3. Steel pipe; 4. Steel blade; 5. Grout outlet hole; 6. Conical cap; 7. Base layer; 8. Sealing cavity; 9. Sealing airbag; 10. Air pipe; 11. Installation groove; 12. Placement cavity; 13. Hollow cavity. Detailed Implementation

[0017] 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.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved with", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] Please see Figure 1-5 This utility model provides a technical solution: a grouting steel spiral pile, the core components of which include a steel pipe 3 and a base layer 7. The steel pipe 3, as the main structure, needs to be drilled into the base layer 7 with the help of the rotational driving force of the steel spiral pile machine. The cavity 13 opened inside provides a channel for grouting operation and also serves as the core carrier of structural stress. The pipe wall design of the steel pipe 3 is highly functional. Several steel blades 4, which are evenly distributed, can cut and squeeze the base soil during drilling, which not only reduces drilling resistance, but also improves the vertical bearing capacity after the pile is formed through the interlocking action between the blades and the soil. The several evenly distributed grout outlet holes 5 located at the bottom of the steel blades 4 are the key outlets for the cement grout to diffuse from the inside of the steel pipe to the surrounding base soil, ensuring that the grout can fully penetrate, fill and reinforce the soil.

[0020] To ensure sealing during the grouting process, the top of the steel pipe 3 is equipped with a grout stop plug 2, which integrates a special sealing structure. This sealing structure consists of a sealing airbag 9 placed in the cavity 12 inside the grout stop plug 2, and an air pipe 10 connected to the surface of the sealing airbag 9 and extending to the outside of the grout stop plug 2. The grout stop plug 2 also has an installation groove 11 for accommodating the air pipe 10, and the surface of the air pipe 10 is equipped with a valve to control the gas flow. When the sealing airbag 9 is inflated through the air pipe 10 (gas can be supplied to the air pipe 10 and the sealing airbag 9 through an external air pump or pneumatic conveying equipment), the sealing airbag 9 expands and fits tightly against the sealing cavity 8 opened on the inner wall of the grouting pipe 1, thereby effectively preventing the grout from leaking from the gap between the grout stop plug 2 and the grouting pipe 1, and ensuring stable grouting pressure.

[0021] Grouting pipe 1 serves as the core channel for grout delivery. There is only one grouting pipe, which is located at the center of steel pipe 3. It is connected to steel pipe 3 in a movable manner, which makes it easy to pull out and retrieve after grouting. A cone cap 6 is installed at the bottom of steel pipe 3. Its sharp structural design can reduce the resistance in the early stage of drilling and help the steel pipe cut into the base soil more easily.

[0022] In this invention, the steel pipe 3 is screwed into the base layer 7 by a steel spiral pile driver. Cement grout is then pumped into the cavity 13 of the steel pipe using the grouting pipe 1. The grout diffuses into the surrounding soil through the grout outlet 5, forming a composite force-bearing system with the steel pipe 3 and the steel blades 4. This significantly improves the ability to withstand vertical forces and effectively reinforces the base layer.

[0023] Specifically, during use, the steel pipe 3 with a cone cap 6 at the bottom is first driven by the steel spiral pile driver and rotated into the base layer 7 (i.e., underground) using the driving force of the steel spiral pile driver. Several steel blades 4 with equal spacing on the pipe wall of the steel pipe 3 play a cutting and propulsion role during rotation. Together with the cone cap 6, they reduce the drilling resistance, so that the steel pipe 3 can enter the preset depth stably and efficiently. At this time, the cavity 13 inside the steel pipe 3 remains hollow, reserving a channel for subsequent grouting operations. After the steel pipe 3 is in place, the grouting pipe 1 is inserted from the top of the steel pipe 3. Since the grouting pipe 1 is located in the center of the steel pipe 3 and is a movable connection, the insertion depth can be flexibly adjusted until it reaches the bottom of the steel pipe 3. Then, the grout stop plug 2 is installed at the top of the steel pipe 3. The sealing airbag 9 is pre-placed in the placement cavity 12 inside the grout stop plug 2. One end of the air pipe 10 is connected to the sealing airbag 9, and the other end passes through the installation groove 11 inside the grout stop plug 2 and extends to the outside. A control valve is provided on the air pipe 10. Next, gas is introduced into the sealing airbag 9 through the air pipe 10. The valve on the air pipe 10 is opened, and the gas enters the sealing airbag 9 to inflate it. The inflated sealing airbag 9 fills the gap between the grout stop plug 2 and the grouting pipe 1. At the same time, the sealing cavity 8 opened on the inner wall of the grouting pipe 1 matches the sealing airbag 9 to further enhance the sealing effect and prevent cement grout from leaking from the top during subsequent grouting, thus ensuring stable grouting pressure. After sealing, cement grout is injected under high pressure into the cavity 13 of the steel pipe 3 through the grouting pipe 1. Under pressure, the cement grout flows downward along the cavity 13 and reaches the bottom of the steel pipe 3. It then seeps out through several evenly distributed grout outlet holes 5 located at the bottom of the steel blade 4 on the pipe wall. The seeping cement grout spreads to the soil of the base layer 7 around the steel pipe 3, reinforcing the soil. After grouting is completed, the grouting equipment is turned off and the grouting pipe 1 is pulled out (because the grouting pipe 1 is a movable connection, it can be easily removed). After the injected cement grout solidifies and reaches the required strength, the solidified cement grout, the steel pipe 3, the steel blade 4, and the reinforced soil of the base layer 7 form an integral structure that jointly bears the vertical force.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grouting steel helical pile, characterized in that, include: The steel pipe (3) and the base layer (7) are provided. The steel pipe (3) extends into the interior of the base layer (7), and the interior of the steel pipe (3) is provided with a cavity (13). The steel pipe (3) is rotated and drilled into the base layer (7) using a steel spiral pile driver. Grouting pipe (1), grouting pipe (1) extends into the interior of steel pipe (3), and the pipe wall of steel pipe (3) is provided with a number of evenly distributed steel blades (4) for screwing into the interior of base layer (7) at equal intervals, and the pipe wall of steel pipe (3) is provided with a number of evenly distributed grout outlet holes (5) at the bottom of steel blades (4). The top end of the steel pipe (3) is provided with a grout stop plug (2) for sealing. The surface of the grout stop plug (2) is provided with a sealing structure for increasing the sealing performance. The air pipe (10) of the sealing structure and the sealing airbag (9) are used together to allow gas to enter the sealing airbag (9) and fill the sealing airbag (9) to increase the sealing performance between the grout stop plug (2) and the grouting pipe (1).

2. The grouting steel spiral pile according to claim 1, characterized in that, The sealing structure includes a placement cavity (12) for placing a sealing airbag (9) inside the stop plug (2), an air tube (10) is connected to the top of the sealing airbag (9), and the top of the air tube (10) extends to the outside of the stop plug (2), and the sealing airbag (9) is connected to the inside of the placement cavity (12).

3. A grouting steel spiral pile according to claim 2, characterized in that, The inside of the stop plug (2) is provided with an installation groove (11) for placing the air pipe (10), and the surface of the air pipe (10) is provided with a valve for controlling the opening and closing of the air pipe (10).

4. A grouting steel spiral pile according to claim 2, characterized in that, The inner wall of the grouting pipe (1) is provided with a sealing cavity (8) for matching and installing the sealing airbag (9).

5. A grouting steel spiral pile according to claim 1, characterized in that, One end of the steel pipe (3) is reinforced by the injected cement grout to strengthen the soil of the base layer (7) around the steel pipe (3), and together with the steel pipe (3) and steel blade (4) it bears the vertical force. The number of grouting pipes (1) is one, and it is pulled out after the grouting is completed.

6. A grouting steel spiral pile according to claim 1, characterized in that, The grouting pipe (1) is located at the center of the steel pipe (3), and the grouting pipe (1) is movably connected in the steel pipe (3).

7. A grouting steel spiral pile according to claim 1, characterized in that, The bottom of the steel pipe (3) is provided with a cone cap (6).

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