Composite secant pile

Abstract

A combined type secant pile comprises plain piles and reinforced piles which are arranged in a staggered mode, the pile diameter of the reinforced piles is larger than that of the plain piles, and a crushing reinforcing area is formed on the secant interface of the reinforced piles and the plain piles. The meat pile is an annular pipe pile, and a plurality of drilling teeth are fixed to the bottom wall of the meat pile in the circumferential direction in a surrounding mode. A grouting pipe is fixed in the meat pile, and a grout outlet of the grouting pipe is arranged close to the drill teeth. The anti-seepage performance of the secant pile can be improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of pile foundations, and specifically relates to a composite interlocking pile. Background Technology

[0002] Interlocking piles are a type of foundation pit retaining structure in which piles interlock with each other. The piles are arranged alternately with one unreinforced plain concrete pile and one reinforced concrete pile. The plain concrete pile is called a plain pile, and the reinforced concrete pile is called a hard pile. During construction, the plain pile is constructed first, followed by the hard pile. The hard pile is constructed before the final setting of the plain pile concrete. During the construction of the hard pile, the concrete at the intersection of adjacent plain piles is cut away to achieve interlocking.

[0003] Since the interlocking piles are poured after the initial setting and before the final setting of the plain piles, an interface is formed at the interlocking surface of the plain and interlocking piles after the construction is completed. The seepage prevention effect of the interlocking piles at the interface is poor. Therefore, when using interlocking piles as the foundation pit retaining structure, an additional layer of waterproof curtain needs to be constructed to improve the waterproof effect of the foundation pit support. However, the construction of an additional waterproof curtain will increase the construction cost. Utility Model Content

[0004] This invention provides a composite interlocking pile to solve the problem of poor water seepage effect of interlocking piles.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A composite interlocking pile includes staggered plain piles and thick piles, wherein the diameter of the thick piles is larger than the diameter of the plain piles, and the interlocking interface between the thick piles and the plain piles forms a fractured reinforcement zone.

[0007] The pile is a ring-shaped pipe pile, and the bottom wall of the pile is fixed with several drill teeth around it.

[0008] A grouting pipe is fixed inside the pile, and the grout outlet of the grouting pipe is located near the drill bit.

[0009] Furthermore, the drill teeth are extended outwards, and the ends of the drill teeth extend beyond the sidewall of the plain pile. The radial span of the drill teeth extending beyond the sidewall of the plain pile is consistent with the thickness of the fractured reinforcement zone.

[0010] Furthermore, the radial span of the drill teeth extending toward the outer wall of the pile is 10-30mm.

[0011] Furthermore, the side wall of the pile near the bottom wall is provided with several grout outlet holes, and the grout outlet end of the grouting pipe is connected to the grout outlet holes.

[0012] Furthermore, the side wall of the pile near the top wall is provided with a plurality of grouting inlets, and the plurality of grouting inlets and the plurality of grouting outlets are provided in a one-to-one correspondence. One end of the grouting pipe is connected to the grouting inlet and the other end is connected to the grouting outlet.

[0013] Furthermore, the grout outlet holes are arranged in multiple layers at intervals along the length of the pile, and the end of the grouting pipe is connected to a corresponding number of grout outlet branch pipes, each of which is connected to one of the multiple layers of grout outlet holes.

[0014] Furthermore, the grouting within the fractured reinforcement zone forms multiple reinforcement sections, and the cement content of the grout in the reinforcement sections is greater than that of the plain pile.

[0015] Furthermore, a protective ring is provided at one end of the inner wall of the pile near the bottom wall. The protective ring is fixed to the inner wall of the pile, and the grouting pipe is located between the protective ring and the inner wall of the pile.

[0016] The present invention can achieve the following beneficial effects:

[0017] 1. The composite interlocking pile of this application uses precast ring pipe piles as the inner pile, which can improve the construction efficiency of the inner pile without affecting the support strength of the interlocking pile; a fractured reinforcement zone is formed at the interlocking interface of the inner pile and the outer pile, and a grouting pipe is fixed inside the inner pile, which can inject grout into the fractured reinforcement zone through the grouting pipe inside the inner pile to realize the secondary pouring of the fractured reinforcement zone, improve the seepage prevention effect at the junction of the inner pile and the outer pile, and thus make the support strength and seepage prevention effect of the interlocking pile of this application better.

[0018] 2. Set the grout outlet close to the bottom wall of the pile so that grout can be injected into the fractured reinforcement zone while drilling the pile downwards. When the pile is drilled to the designed depth, the fractured reinforcement zone is also grouted, thus completing the construction of the pile.

[0019] 3. Fix the grouting pipe inside the pile so that the grouting equipment outlet can be connected to the grouting inlet hole no matter what position the pile rotates to during the drilling process, so as to realize grouting. The grouting pipe is not affected by the rotation of the pile during the drilling process. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a top view of a composite interlocking post according to the present invention;

[0022] Figure 2 This is a schematic diagram of the vertical cross-sectional structure of a composite interlocking pile according to the present invention;

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This is a partial schematic diagram of the grouting pipe of this utility model with a grout outlet branch pipe.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 1. Plain pile; 2. Mixed pile; 21. Drill teeth; 22. Grout outlet hole; 23. Grouting inlet hole; 3. Crushed and reinforced zone; 4. Grouting pipe; 41. Grout outlet branch pipe; 5. Protective ring. Detailed Implementation

[0027] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0028] like Figures 1 to 4 As shown, a composite interlocking pile includes multiple interlocking piles 2 and multiple plain piles 1 arranged alternately around the perimeter of a foundation pit. The diameter of the interlocking piles 2 is larger than that of the plain piles 1 to ensure the support strength of the interlocking piles. During construction, multiple plain piles 1 are first formed by jet grouting at intervals around the perimeter of the foundation pit using the jet grouting method. A construction area for the interlocking piles 2 is reserved between two adjacent plain piles 1. In this application, the interlocking piles 2 are prefabricated ring pipe piles to improve the construction efficiency of the interlocking piles 2; in addition, setting the interlocking piles 2 as prefabricated ring pipe piles facilitates the welding of drill teeth 21 to the bottom wall of the interlocking piles 2.

[0029] Drill teeth 21 are arranged in a ring around the bottom wall of the pile 2, with the drill teeth 21 extending outward and the ends of the drill teeth 21 extending beyond the side wall of the pile 1. The drill teeth 21 can be one of milling teeth, cutting teeth, and bucket teeth. The drill teeth 21 are used to break up the soil during the drilling of the pile 2. During the drilling of the pile 2, the drill teeth 21 break up the soil layers around the pile 1 and the pile 2, thereby forming a broken and reinforced zone 3 around the pile 2. The radial span of the drill teeth 21 extending beyond the side wall of the pile 1 is consistent with the thickness of the broken and reinforced zone 3. Specifically, the radial span of the drill teeth 21 extending towards the outer wall of the pile 2 is 10-30mm.

[0030] Furthermore, multiple grouting pipes 4 are installed inside the pile 2, and multiple grout outlet holes 22 are opened around the side wall of the pile 2 near the drill bit 21, and multiple grouting inlet holes 23 are opened around the side wall of the pile 2 near the top. The multiple grout outlet holes 22 and multiple grouting inlet holes 23 are arranged in a one-to-one correspondence, and a grouting pipe 4 is arranged between a set of corresponding grout outlet holes 22 and grouting inlet holes 23.

[0031] After drilling a certain distance into the solid pile 2, a fractured and reinforced zone 3 is formed around the solid pile 2. At this point, the grouting equipment is connected to the grouting inlet 23, allowing the grout to be injected into the fractured and reinforced zone 3 along the grouting inlet 23, grouting pipe 4, and grout outlet 22. After grouting, the fractured and reinforced zone 3 forms a reinforced section. It should be noted that the cement content of the grout in the reinforced section is greater than that of the solid pile 1, resulting in higher strength in the fractured and reinforced zone 3, thus overcoming the problem of relatively weak strength at the interface between the solid pile 2 and the solid pile 1.

[0032] The pile 2 is drilled segment by segment. After the pile 2 has been drilled to a certain distance, drilling stops and grouting is performed on the corresponding fractured and reinforced zone 3 using the grouting pipe 4. After grouting, drilling of the pile 2 continues until the designed depth is reached. Once the pile 2 has been drilled to the designed depth, grouting is performed on the fractured and reinforced zone 3 at the bottom to form a reinforced section. This completes the construction of the pile 2 and the reinforcement of the surrounding fractured and reinforced zone 3, resulting in faster construction speed and higher efficiency. In addition, grout outlet holes 22 and grout inlet holes 23 are only opened on the side wall of the pile 2, allowing the pile 2 to rotate to any angle during drilling. During grouting, it is convenient to connect the grout outlet of the grouting equipment to the grout inlet hole 23, ensuring that the drilling of the pile 2 does not affect the grouting.

[0033] During the drilling process, a large amount of gravel and soil is generated. When the gravel and soil enter the internal area of ​​the pile 2, the accumulation of gravel and soil can easily affect the smooth transport of grout by the grouting pipe 4. Therefore, a protective ring 5 is set in the area near the bottom wall inside the pile 2. The protective ring 5 is a ring structure and is set concentrically with the pile 2. The protective ring 5 is fixed to the inner wall of the pile 2 by welding steel plates. The grouting pipe 4 is located between the protective ring 5 and the inner wall of the pile 2. This makes it less likely for the gravel and soil to damage the structure of the grouting pipe 4 when it enters the internal area of ​​the pile 2, so that the grouting operation can be carried out smoothly.

[0034] In other embodiments, the grout outlet 22 can be set in multiple layers. If the soil layer is a rock gravel layer or other soil layer with low grouting resistance of the grouting pipe 4, only one layer of grout outlet 22 can be set. If the soil layer is a silt layer or other soil layer with high grouting resistance, 2-3 layers of grout outlet 22 can be set. Each layer of grout outlet 22 is arranged at intervals, and the end of the grouting pipe 4 is connected to a corresponding number of grout outlet branch pipes 41. Each grout outlet branch pipe 41 is connected to multiple layers of grout outlet 22, thereby achieving uniform grouting along the height direction of the pile 2, reducing grouting resistance, and making the grouting reinforcement effect better.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite interlocking post, characterized in that: It includes staggered plain piles (1) and stud piles (2), wherein the diameter of the stud piles (2) is larger than the diameter of the plain piles (1), and the interface between the stud piles (2) and the plain piles (1) forms a fractured reinforcement zone (3). The pile (2) is a ring-shaped pipe pile, and the bottom wall of the pile (2) is fixed with several drill teeth (21) around it. The grouting pipe (4) is fixed inside the pile (2), and the grout outlet of the grouting pipe (4) is located near the drill bit (21).

2. The composite interlocking post according to claim 1, characterized in that: The drill bit (21) is extended outward, and the end of the drill bit (21) extends out of the side wall of the plain pile (1). The radial span of the drill bit (21) extending out of the side wall of the plain pile (1) is consistent with the thickness of the fractured reinforcement zone (3).

3. A composite interlocking post according to claim 2, characterized in that: The radial span of the drill bit (21) extending toward the outer wall of the pile (2) is 10-30 mm.

4. A composite interlocking post according to claim 1, characterized in that: The pile (2) has several grout outlet holes (22) around its side wall near the bottom wall, and the grout outlet end of the grouting pipe (4) is connected to the grout outlet holes (22).

5. A composite interlocking post according to claim 4, characterized in that: The pile (2) has a number of grouting inlets (23) around the side wall near the top wall. The multiple grouting inlets (23) and multiple grouting outlets (22) are arranged in a one-to-one correspondence. One end of the grouting pipe (4) is connected to the grouting inlet (23), and the other end is connected to the grouting outlet (22).

6. A composite interlocking post according to claim 4, characterized in that: The grout outlet holes (22) are arranged in multiple layers along the length of the pile (2), and the end of the grouting pipe (4) is connected to a corresponding number of grout outlet branch pipes (41). The grout outlet branch pipes (41) are connected to the multiple layers of grout outlet holes (22) one by one.

7. A composite interlocking post according to claim 1, characterized in that: The grouting in the fractured reinforcement zone (3) forms multiple reinforcement sections, and the amount of cement in the grouting slurry of the reinforcement section is greater than the cement content of the plain pile (1).

8. A composite interlocking post according to claim 1, characterized in that: A protective ring (5) is provided at one end of the inner wall of the pile (2), and the protective ring (5) is fixed to the inner wall of the pile (2). The grouting pipe (4) is located between the protective ring (5) and the inner wall of the pile (2).

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