Rotary excavating cast-in-place pile for foundation pit
By installing a drainage structure outside the drill rod of the rotary digging cast pile and extracting groundwater, the problem of the combination of cement slurry and groundwater is solved, and the effect of forming a solid rotary digging cast pile is achieved.
Patent Information
- Application Number
- CN202421384568.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-06-18
AI Technical Summary
During the drilling rod hole formation process, the cement slurry mixed with water due to the influence of groundwater, resulting in a decrease in viscosity and forming an unstable rotary slurry pile.
A rotary cast-injected pile including a drill pipe and a circular plate is designed. A drainage structure is installed outside the drill pipe to extract groundwater through the water pipe to prevent the cement slurry from combining with groundwater, thereby maintaining viscosity.
The combination of cement slurry and groundwater is effectively avoided, and the viscosity of cement slurry is maintained, thereby forming a solid rotary cast-in pile.
Smart Images
Figure CN222457353U_ABST
Abstract
Description
Technical Field
[0001] This patent relates to the technical field of rotary bored cast-in-place piles for foundation pits, specifically a type of rotary bored cast-in-place piles used for foundation pits. Background Art
[0002] Rotary bored piles refer to a deep foundation project that first uses a rotary drilling rig to construct a drill rod, then fills the hole with cement slurry, and forms a cast body in the hole after digging out the soil. With the continuous development of urban construction, various high-rise buildings and important buildings in urban areas are increasing. They are widely used in the foundation pile construction of China's roads, railways, bridges and large buildings. However, the rotary bored piles in the foundation pit currently have the problem of mixing the injected cement slurry with water during the drilling process due to the influence of groundwater, resulting in a decrease in the viscosity of the cement slurry, thereby making the manufactured rotary bored piles unstable. Utility Model Content
[0003] The purpose of this patent is to provide a rotary bored cast-in-place pile for foundation pit.
[0004] To achieve the above purpose, this patent provides the following technical solutions: a rotary bored pile for foundation pit, comprising a drill rod and a circular plate, the circular plate is provided with a circular opening, the drill rod is installed in the circular opening, a drainage structure is installed outside the drill rod, the drainage structure comprises a cylinder, a water pipe, a first circular hole and a second circular hole;
[0005] A vertical hole is provided on the cylinder, the drill rod is installed in the vertical hole, the drill rod and the cylinder are inserted into the soil, the cylinder is sleeved outside the drill rod, the water pipe is placed between the cylinder and the drill rod, the first circular hole is provided on the cylinder, the upper discharge end of the water pipe is installed in the first circular hole, the second circular hole is provided on the cylinder, the lower water inlet end of the water pipe is installed in the second circular hole, and the discharge end of the water pipe is connected to the liquid inlet end of the external pump body.
[0006] Preferably, a pressurizing structure is installed on the water pipe, and the pressurizing structure includes an air port, a connecting pipe, a negative pressure ball and a valve body;
[0007] The air port is opened on the water pipe, the connecting pipe is installed in the air port, the negative pressure ball is connected to the connecting pipe, and the valve body is installed between the connecting pipe and the air outlet end of the negative pressure ball through a flange.
[0008] Preferably, a drill bit is installed at the bottom end of the drill rod.
[0009] Preferably, the drill bit is mounted on the drill rod via a connecting structure, and the connecting structure includes a bolt and a thread groove;
[0010] The bolt is installed on the drill rod, the thread groove is arranged on the drill bit, and the bolt is sleeved in the thread groove.
[0011] Preferably, a threaded hole is provided on the drill rod, a threaded rod is sleeved in the threaded hole, and a connecting ring is installed on the threaded rod.
[0012] Preferably, the circular plate is provided with steel bar through holes, the cylinder is provided with steel bar through holes, the number of the steel bar through holes is not less than eight, and the steel bar through holes are distributed equidistantly in a circular shape.
[0013] Compared with the prior art, the beneficial effects of this patent are: the rotary bored pile used for foundation pit has the following advantages compared with the traditional technology:
[0014] The drill rod carries the cylinder to drill into the soil to construct a hole. During the drilling process, the liquid inlet end of the external pump body draws out the groundwater in the hole through the water pipe. As the drill rod carries the cylinder out of the hole, cement slurry is added to the hole to avoid the combination of the added cement slurry and the groundwater, so that the viscosity of the added cement slurry is reduced, so that a solid rotary bored cast-in-place pile is formed. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the structure of this patent;
[0016] Figure 2 This is a schematic diagram of the structure of the drill bit, bolt and thread groove of the patent;
[0017] Figure 3 This is a schematic diagram of the structure of the connecting pipe, negative pressure ball and valve body of this patent;
[0018] Figure 4 This is a schematic diagram of the structure of Patent A;
[0019] Figure 5 This is a schematic diagram of the structure of patent B.
[0020] In the figure: 1, drill rod, 2, round plate, 3, round mouth, 4, drainage structure, 401, cylinder, 402, water pipe, 403, first round hole, 404, second round hole, 5, soil, 6, threaded hole, 7, threaded rod, 8, connecting ring, 9, steel bar through hole, 10, drill bit, 11, connecting structure, 12, bolt, 13, threaded groove, 14, air port, 15, connecting pipe, 16, negative pressure ball, 17, valve body. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of this patent to clearly and completely describe the technical solutions in the embodiments of this patent. Obviously, the described embodiments are only part of the embodiments of this patent, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.
[0022] See also Figure 1-5 This patent provides a technical solution: a rotary bored pile for foundation pit, comprising a drill rod 1 and a circular plate 2, a circular opening 3 is opened on the circular plate 2, the drill rod 1 is installed in the circular opening 3, a drainage structure 4 is installed outside the drill rod 1, and the drainage structure 4 includes a cylinder 401, a water pipe 402, a first circular hole 403 and a second circular hole 404;
[0023] A vertical hole is provided on the cylinder 401, and the drill rod 1 is installed in the vertical hole. The distance between the top of the cylinder 401 and the circular plate 2 is 0.5-1m. The drill rod 1 and the cylinder 401 are inserted into the soil 5. The cylinder 401 is sleeved outside the drill rod 1. The water pipe 402 is placed between the cylinder 401 and the drill rod 1. The first circular hole 403 is provided on the cylinder 401. The upper discharge end of the water pipe 402 is installed in the first circular hole 403. The second circular hole 404 is provided on the cylinder 401. The lower water inlet end of the water pipe 402 is installed in the second circular hole 404. The water pipe 402 is provided in the cylinder 401. The lower water inlet end of 02 is placed in a part of the second circular hole 404, and the discharge end of the water pipe 402 is connected to the liquid inlet end of the external pump body (they can be connected by a hose), and the drill rod 1 carries the cylinder 401 to drill into the soil 5 to construct a hole. During the hole-making process, the liquid inlet end of the external pump body draws out the groundwater in the hole through the water pipe 402, and the drill rod 1 draws out the cylinder 401 into the hole and fills the hole with cement slurry to avoid the added cement slurry from combining with the groundwater, so as to reduce the viscosity of the added cement slurry and form a solid bored cast-in-place pile.
[0024] A pressurizing structure is installed on the water pipe 402, and the pressurizing structure includes an air port 14, a connecting pipe 15, a negative pressure ball 16 and a valve body 17;
[0025] The air port 14 is opened on the water pipe 402, the connecting pipe 15 is installed in the air port 14, the negative pressure ball 16 is connected to the connecting pipe 15, and the valve body 17 is installed between the connecting pipe 15 and the air outlet end of the negative pressure ball 16 through a flange. When extracting groundwater, the valve 17 is closed, and before extraction, the valve 17 is opened, and the negative pressure ball 16 is squeezed through the external extrusion structure. The negative pressure ball 16 pumps air into the water pipe 402 through the connecting pipe 1515, so that when the drill rod 1 carries the cylinder 401 to drill into the soil 5, the soil in the second circular hole 404 is squeezed out.
[0026] A drill bit 10 is installed at the bottom end of the drill rod 1. The drill bit 10 is installed on the drill rod 1 through a connecting structure 11. The connecting structure 11 includes a bolt 12 and a thread groove 13.
[0027] The bolt 12 is installed on the drill rod 1, and the thread groove 13 is opened on the drill bit 10. The bolt 12 is sleeved in the thread groove 13, so that the thread groove 13 on the drill bit 10 is screwed on the bolt 12 on the drill rod 1, and the drill bit 10 makes it easier for the drill rod 1 to drill into the soil 5.
[0028] A threaded hole 6 is provided on the drill rod 1, a threaded rod 7 is sleeved in the threaded hole 6, and a connecting ring 8 is installed on the threaded rod 7, so that the threaded rod 7 on the connecting ring 8 is screwed into the threaded hole 6 on the drill rod 1, and the rope of the external elevator is connected to the connecting ring 8 to drive the drill rod 1 to move up and down.
[0029] A steel bar through hole 9 is opened on the circular plate 2, and a steel bar through hole 9 is opened in the cylinder 401. The number of the steel bar through holes 9 is not less than eight, and the steel bar through holes 9 are equidistantly distributed in a circular shape. The steel bar through holes 9 on the circular plate 2 correspond to the steel bar through holes 9 in the cylinder 401 one by one, and the distance between the steel bar through holes 9 on the circular plate 2 and the center of the drill rod 1 is smaller than the distance between the inner diameter of the cylinder 401 and the center of the drill rod 1. The steel bar through holes 9 on the circular plate 2 and the steel bar through holes 9 in the cylinder 401 are staggered from the position of the water pipe 402, so that external steel bars can be put in without interfering with the water pipe 402.
[0030] When using the rotary bored pile for foundation pit, firstly, screw the threaded rod 7 on the connecting ring 8 into the threaded hole 6 on the drill rod 1, connect the rope of the external elevator to the connecting ring 8, screw the threaded groove 13 on the drill bit 10 onto the bolt 12 on the drill rod 1, install the drill bit 10 on the drill rod 1, and drill the drill rod 1 with the cylinder 401 into the soil 5 to construct a hole, and the drill bit 10 makes it easier for the drill rod 1 to drill into the soil 5. During the hole-forming process, the liquid inlet end of the external pump body extracts the groundwater in the hole through the water pipe 402. When extracting groundwater, The valve 17 is closed, and before extraction, the valve 17 is opened, and the negative pressure ball 16 is squeezed through the external squeezing structure. The negative pressure ball 16 pumps air into the water pipe 402 through the connecting pipe 1515, so that when the drill rod 1 with the cylinder 401 drills into the soil 5, the soil in the second circular hole 404 is squeezed out. As the drill rod 1 with the cylinder 401 is pulled out into the hole, cement slurry is added into the hole, and through the steel bar through-hole 9 on the circular plate 2 and the steel bar through-hole 9 in the cylinder 401, the external steel bars are inserted into the injected cement slurry one by one, so as to form a solid rotary bored cast-in-place pile.
[0031] Although the embodiments of the present patent have been shown and described, it will be understood 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 patent, and the scope of the present patent is defined by the appended claims and their equivalents.
Claims
1. A rotary bored pile for foundation pit, comprising a drill rod (1) and a circular plate (2), characterized in that: The circular plate (2) is provided with a circular opening (3), the drill rod (1) is installed in the circular opening (3), a drainage structure (4) is installed outside the drill rod (1), and the drainage structure (4) comprises a cylinder (401), a water pipe (402), a first circular hole (403) and a second circular hole (404); The cylinder (401) is provided with a vertical hole, the drill rod (1) is installed in the vertical hole, the drill rod (1) and the cylinder (401) are inserted into the soil (5), the cylinder (401) is sleeved outside the drill rod (1), the water pipe (402) is placed between the cylinder (401) and the drill rod (1), the first circular hole (403) is provided on the cylinder (401), the upper discharge end of the water pipe (402) is installed in the first circular hole (403), the second circular hole (404) is provided on the cylinder (401), the lower water inlet end of the water pipe (402) is installed in the second circular hole (404), and the discharge end of the water pipe (402) is connected to the liquid inlet end of the external pump body.
2. The rotary bored pile for foundation pit according to claim 1, characterized in that: A pressurizing structure is installed on the water pipe (402), and the pressurizing structure comprises an air port (14), a connecting pipe (15), a negative pressure ball (16) and a valve body (17); The air port (14) is opened on the water pipe (402), the connecting pipe (15) is installed in the air port (14), the negative pressure ball (16) is connected to the connecting pipe (15), and the valve body (17) is installed between the connecting pipe (15) and the air outlet end of the negative pressure ball (16) through a flange.
3. The rotary bored pile for foundation pit according to claim 1, characterized in that: A drill bit (10) is installed at the bottom end of the drill rod (1).
4. The rotary bored pile for foundation pit according to claim 3, characterized in that: The drill bit (10) is mounted on the drill rod (1) via a connection structure (11), wherein the connection structure (11) comprises a bolt (12) and a thread groove (13); The bolt (12) is installed on the drill rod (1), the thread groove (13) is opened on the drill bit (10), and the bolt (12) is sleeved in the thread groove (13).
5. The rotary bored pile for foundation pit according to claim 1, characterized in that: The drill rod (1) is provided with a threaded hole (6), a threaded rod (7) is sleeved in the threaded hole (6), and a connecting ring (8) is installed on the threaded rod (7).
6. The rotary bored pile for foundation pit according to claim 1, characterized in that: The circular plate (2) is provided with steel bar through holes (9), the cylinder (401) is provided with steel bar through holes (9), the number of the steel bar through holes (9) is not less than eight, and the steel bar through holes (9) are distributed in an annular shape with equal spacing.