Precast concrete post-grouting pile structure

Abstract

The utility model belongs to the technical field of post-grouting piles, and discloses a precast concrete post-grouting pile structure which comprises a pile body, a precast grouting pipe is installed in the pile body, and a conical head is arranged at the bottom of the precast grouting pipe. The bottom of the grouting prefabricated pipe is provided with a bent pipe, the surface wall of the conical head is provided with a bottom grout outlet, the bottom grout outlet is communicated with the bent pipe, the bent pipe is installed at the bottom of the grouting prefabricated pipe, the output end of the bent pipe is connected with the bottom grout outlet of the conical head, the bent pipe is bent upwards, and the conical head is connected with the bottom grout outlet of the conical head. The upward perpendicular line at the lower position of the bottom slurry outlet is located on the upward bending portion of the inner wall of the bent pipe, when the pile body descends in the using process, soil or other sundries adhering to the bottom slurry outlet can be located on the upward bending portion of the bent pipe, and the soil or other sundries can be extruded out of the bottom slurry outlet along with extrusion force generated when the pile body descends. And soil or sundries are prevented from being accumulated at the bottom grout outlet to affect grouting.

Description

Technical Field

[0001] The utility model belongs to the technical field of post-grouting piles, and in particular relates to a prefabricated concrete post-grouting pile structure. Background Art

[0002] Precast concrete structures are widely used in the construction industry. In certain specific geological environments, when piling operations are required, in order to enhance the stability of the pile body, grouting operations will be carried out after the pile body reaches a certain strength. When precast concrete structures face the needs of special terrain, grouting pipes will be preset inside the concrete. After the precast concrete parts are fixed, grouting will be carried out through the grouting pipes to enhance the bearing capacity of the pile body.

[0003] When precast concrete piles are implanted into pre-drilled holes, the grouting outlet at the bottom is easily stuck in the soil during the descent, which increases the difficulty of grouting. Since the precast concrete parts need to be inserted into the drilled holes at the construction site after being manufactured, the lack of corresponding lifting points when lifting the precast concrete parts can easily cause them to tilt during insertion. Utility Model Content

[0004] The utility model aims to provide a precast concrete post-grouting pile structure to solve the problems that, when the existing precast concrete post-grouting pile structure is implanted into a pre-drilled hole, debris is easily caught in the grouting outlet at the bottom, and when the precast concrete pile is hoisted, the pile body is easily tilted due to the lack of lifting points.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a precast concrete post-grouting pile structure, comprising a pile body, a precast grouting pipe is installed inside the pile body, and a cone head is provided at the bottom of the precast grouting pipe; a bent pipe is provided at the bottom of the precast grouting pipe, and the bent pipe is bent upward; a bottom slurry outlet is opened on the surface wall of the cone head, and the bottom slurry outlet and the bent pipe are connected to each other.

[0006] Preferably, an outer steel bar column array is arranged inside the pile body, and an inner steel bar column array is arranged inside the outer steel bar column array.

[0007] Preferably, the surface walls of the outer steel bar column array and the inner steel bar column array are both provided with fixed steel bar rings for fixation, and the insides of the outer steel bar column array and the inner steel bar column array are both fixedly installed with horizontal stabilizing steel bars for controlling the spacing.

[0008] Preferably, the side wall of the prefabricated grouting pipe is provided with a side grouting outlet extending to the surface wall of the pile body, and the top end of the prefabricated grouting pipe is provided with a grouting port.

[0009] Preferably, a protruding top ring is provided above the pile body, and the protruding top ring and the pile body are an integrated structure.

[0010] Preferably, the protruding top ring is provided with hanging holes distributed in a ring-shaped array, and the number of the hanging holes is even, and a reinforced support area is provided between the inner wall of the protruding top ring and the top wall of the pile body.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] (1) The utility model installs a bending pipe at the bottom of the grouting prefabricated pipe, and the output end of the bending pipe is connected to the bottom slurry outlet of the cone head surface wall. The bending pipe is upwardly curved, and the upward vertical line at the low position of the bottom slurry outlet is located at the upward curved part of the inner wall of the bending pipe. When in use, when the pile body descends, the sticky mud or other debris at the bottom slurry outlet will be located at the upward curved part of the bending pipe, and the extrusion force generated when the pile body descends will squeeze it out of the bottom slurry outlet, thereby preventing mud or debris from accumulating at the bottom slurry outlet and affecting grouting.

[0013] (2) The utility model has a protruding top ring at the top of the pile body. The protruding top ring and the pile body are an integrated structure. Lifting holes are provided inside the protruding top ring. The number of the lifting holes is even and they are distributed in a circular array. When in use, the lifting rope is passed through two lifting holes in the same straight line and then lifted. The lifting points provided by the lifting holes are used to avoid the pile body from being tilted when it is lifted. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a top view of the utility model;

[0016] Figure 3 It is a top view of the outer steel bar column array and the inner steel bar column array of the utility model;

[0017] Figure 4 This is the appearance diagram of the utility model;

[0018] In the figure: 1. Prefabricated grouting pipe; 2. Strengthened support area; 3. Protruding top ring; 4. Lifting hole; 5. Pile body; 6. Horizontal stabilizing steel bars; 7. Fixed steel bar ring; 8. Outer steel bar column array; 9. Inner steel bar column array; 10. Side grouting outlet; 11. Cone head; 12. Bending pipe; 13. Bottom grouting outlet; 14. Grouting outlet. DETAILED DESCRIPTION

[0019] 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.

[0020] See also Figure 1 and Figure 4 As shown, it includes a pile body 5, a prefabricated grouting pipe 1 is installed inside the pile body 5, and a cone head 11 is provided at the bottom of the prefabricated grouting pipe 1; a bent pipe 12 is provided at the bottom of the prefabricated grouting pipe 1, and the bent pipe 12 is bent upward; a bottom slurry outlet 13 is opened on the surface wall of the cone head 11, and the bottom slurry outlet 13 and the bent pipe 12 are connected to each other.

[0021] Through the above technical solution;

[0022] Since the curved tube 12 is bent upward, and its tail end will gradually point upward, when the pile body 5 is driven into the pre-drilled hole, the bottom slurry outlet 13 located on the side wall of the cone head 11 will contact the inner wall of the hole. Under the structural effect of the cone head 11, the hole will gradually expand outward, and the soil or other debris contacted by the bottom slurry outlet 13 at this time will be squeezed outward under the downward pressure of the pile body 5. The upward-bent curved tube 12 can effectively avoid the bottom slurry outlet 13 from being blocked during piling, thereby preventing the bottom slurry outlet 13 from being blocked and increasing the difficulty of grouting.

[0023] See also Figure 1 Figure 2 and Figure 4 As shown, a protruding top ring 3 is provided above the pile body 5, and the protruding top ring 3 and the pile body 5 are an integrated structure; the inside of the protruding top ring 3 is provided with hanging holes 4 distributed in a ring array, and the number of the hanging holes 4 is even, and a reinforced support area 2 is provided between the inner wall of the protruding top ring 3 and the top wall of the pile body 5.

[0024] Through the above technical solution;

[0025] An even number of lifting holes 4 can ensure that two lifting holes 4 are located in the same straight line. When a lifting rope is used to pass through the two lifting holes 4 in the same straight line for lifting, the pile body 5 can be prevented from tilting. Four lifting holes 4 are the best number, and too many should not be set to avoid affecting the structural strength of the protruding top ring 3.

[0026] See also Figure 1-Figure 4 As shown, an outer steel bar column array 8 is arranged inside the pile body 5 , and an inner steel bar column array 9 is arranged inside the outer steel bar column array 8 . The outer steel bar column array 8 and the inner steel bar column array 9 serve as the internal reinforcement structure of the pile body 5 to increase the toughness of the pile body 5 .

[0027] Preferably, the surface walls of the outer steel column array 8 and the inner steel column array 9 are provided with fixed steel rings 7 for fixation, and the interiors of the outer steel column array 8 and the inner steel column array 9 are fixedly installed with horizontal stabilizing steel bars 6 for controlling the spacing. The fixed steel rings 7 fix the different steel columns in the outer steel column array 8 and the inner steel column array 9, so that the steel columns are equidistantly distributed.

[0028] Preferably, the side wall of the prefabricated grouting pipe 1 is provided with a side grouting port 10 extending to the surface wall of the pile body 5, and the top of the prefabricated grouting pipe 1 is provided with a grouting port 14. When performing the post-grouting operation, the grouting equipment is connected to the grouting port 14, and the slurry is introduced inwardly at this point. The slurry combines with the soil around the pile body 5 through infiltration, splitting, filling, and compaction, solidifies the sediment at the bottom of the pile and the mud skin on the side of the pile, thereby improving the bearing capacity and reducing settlement.

[0029] The working principle and use process of the utility model: when using the utility model, the outer steel column array 8 and the inner steel column array 9 are fixed respectively by fixing the steel ring 7, and the horizontal stabilizing steel bar 6 is used to increase the stability between the outer steel column array 8 and the inner steel column array 9, and the prefabricated grouting pipe 1 is installed inside it, which is placed in the corresponding mold, and then concrete is poured on the outside of the outer steel column array 8 and the inner steel column array 9, and a pile body 5 is formed after it solidifies. When piling, the lifting rope is passed through the two lifting holes 4 in the same straight line to provide a stable lifting force point to avoid the pile body 5 from tilting when lifting. When the pile body 5 is driven into the pre-drilled pile hole, since the bending tube 12 is bent upward and the bottom slurry outlet 13 is located in the upwardly bent part, when soil or other debris is stuck at the bottom slurry outlet 13, it will be squeezed to the outside by the extrusion force generated when the pile body 5 descends, thereby avoiding soil or other debris blocking the bottom slurry outlet 13 and increasing the difficulty of grouting.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precast concrete post-grouting pile structure, characterized in that: It comprises a pile body (5), a prefabricated grouting pipe (1) is installed inside the pile body (5), and a cone head (11) is arranged at the bottom of the prefabricated grouting pipe (1); A bent pipe (12) is provided at the bottom of the prefabricated grouting pipe (1), and the bent pipe (12) is in an upwardly bent shape; A bottom slurry outlet (13) is provided on the surface wall of the cone head (11), and the bottom slurry outlet (13) and the curved pipe (12) are communicated with each other.

2. A precast concrete post-grouting pile structure according to claim 1, characterized in that: An outer steel bar column array (8) is arranged inside the pile body (5), and an inner steel bar column array (9) is arranged inside the outer steel bar column array (8).

3. The precast concrete post-grouting pile structure according to claim 2, characterized in that: The outer walls of the outer steel column array (8) and the inner steel column array (9) are both provided with fixed steel rings (7) for fixing, and the inner walls of the outer steel column array (8) and the inner steel column array (9) are both fixedly installed with horizontal stabilizing steel bars (6) for controlling the spacing.

4. The precast concrete post-grouting pile structure according to claim 3, characterized in that: The side wall of the prefabricated grouting pipe (1) is provided with a side grouting outlet (10) extending to the surface wall of the pile body (5), and the top end of the prefabricated grouting pipe (1) is provided with a grouting port (14).

5. The precast concrete post-grouting pile structure according to claim 4, characterized in that: A protruding top ring (3) is arranged above the pile body (5), and the protruding top ring (3) and the pile body (5) are an integrated structure.

6. The precast concrete post-grouting pile structure according to claim 5, characterized in that: The protruding top ring (3) is provided with hanging holes (4) distributed in a ring array, and the number of the hanging holes (4) is even. A reinforced support area (2) is provided between the inner wall of the protruding top ring (3) and the top wall of the pile body (5).

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