Drill hammer structure matched with casing pipe to twist off cast-in-place pile
By setting up a threaded rod and U-shaped rod driven by a servo motor on the drill hammer, the problem of difficulty in installing the drill hammer is solved, and efficient and low-cost old pile removal is achieved.
Patent Information
- Application Number
- CN202422143998.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-02
AI Technical Summary
In the prior art, the drill hammer needs to be stuck between the casing and the old pile from top to bottom, resulting in high construction costs and low efficiency.
A structure including a brazing hammer, a sleeve and an old pile was designed. The servo motor is provided with a cavity on the drilling hammer. The threaded rod is driven by the servo motor to drive the U-shaped rod and the extrusion plate, and the old pile is pressed against the inner wall of the sleeve, simplifying the installation process of the brazing hammer.
It improves construction efficiency, reduces construction costs, and reduces manpower and material consumption.
Smart Images
Figure CN223214566U_ABST
Abstract
Description
Technical Field
[0001] The utility model patent relates to the technical field of pile removal, specifically, to a drill hammer structure for cooperating with a casing to twist off a bored pile. Background Art
[0002] To meet the needs of urban transportation, subway lines continue to expand in major cities, and underground tunnel construction is becoming increasingly common. During shield tunneling, conflicts between the shield lines and obsolete pile foundations of existing buildings and structures often occur. To ensure the smooth progress of shield tunneling, the old piles must be removed before shield construction without compromising the safety of surrounding infrastructure. This is often accomplished by driving a drill hammer down the inner wall of the casing, embedding the hammer head in the gap between the casing and the old pile. The drill then drives the casing back, breaking the old pile, which is then removed using a crawler crane.
[0003] When pulling out piles using this method, pressure needs to be applied to the drill hammer from top to bottom so that the drill hammer is stuck between the casing and the old pile. The pressure application process requires a lot of manpower and material resources, resulting in high construction costs and low work efficiency. Utility Model Content
[0004] The purpose of the utility model is to provide a drill hammer structure for cooperating with casing to twist off cast-in-place piles, aiming to solve the problem in the prior art that the drill hammer needs to be pressurized from top to bottom, causing the drill hammer to be stuck between the casing and the old pile, and the pressure application process requires a lot of manpower and material resources, resulting in high construction costs and low work efficiency.
[0005] The utility model is achieved in this way: a drill hammer structure for cooperating with a casing to twist off a cast-in-place pile comprises a drill hammer, a casing and an old pile, wherein the casing is sleeved on the old pile, and the drill hammer is located in a gap between the casing and the old pile, a cavity is opened on the drill hammer, a servo motor is arranged in the cavity, a threaded rod is mounted on the output shaft of the servo motor, an end of the threaded rod away from the servo motor is mounted on the wall of the cavity, a U-shaped rod is threadedly connected to the threaded rod, and both ends of the U-shaped rod near its opening pass through the drill hammer and are connected to the same extrusion plate.
[0006] Preferably, a connecting plate is installed in the cavity, and the upper and lower ends of the connecting plate are respectively installed on the top wall and the bottom wall of the cavity. The servo motor is installed on the connecting plate, and its output shaft passes through the connecting plate and is connected to the threaded rod.
[0007] Preferably, a threaded hole is provided at a position of the U-shaped rod corresponding to the threaded rod, and the threaded hole is adapted to the threaded rod.
[0008] Preferably, a limiting rod is installed on the connecting plate, one end of the limiting rod away from the connecting plate is installed on the wall surface of the cavity, and one end of the U-shaped rod away from the threaded rod is slidably installed on the limiting rod.
[0009] Preferably, a limiting hole is provided at a position of the U-shaped rod corresponding to the limiting rod, and the limiting hole is adapted to the limiting rod.
[0010] Preferably, the drill hammer is provided with two connecting grooves, which are communicated with the cavity and are adapted to the two ends of the U-shaped rod close to the opening.
[0011] Preferably, a connecting piece is installed on the top of the drill hammer.
[0012] Preferably, a cover plate is movably mounted on the outer curved surface of the drill hammer, and the cover plate is adapted to a notch formed by the cavity on the drill hammer.
[0013] Preferably, the corners of the drill hammer and the bottom end of the extrusion plate that are away from each other are both provided with inclined surfaces.
[0014] Preferably, the drill hammer is composed of several trapezoidal steel plates, the upper bases of the several trapezoidal steel plates are longer than the length of their lower bases, the upper bases of the several trapezoidal steel plates constitute the top of the drill hammer, the lower base is the bottom of the drill hammer, and the curvature of the drill hammer fits the inner wall of the casing.
[0015] The drill hammer structure provided by the present invention cooperates with the casing to twist off the bored pile. The drill hammer is placed in the gap between the casing and the old pile, and then the servo motor is started. The rotation of the servo motor drives the threaded rod connected to it to rotate synchronously, causing the U-shaped rod threaded thereon to move in a direction away from the servo motor, thereby driving the extrusion plate connected to the U-shaped rod to move toward the old pile until the old pile is pressed between the extrusion plate and the inner wall of the casing. When the drill hammer is used, it only needs to be manually placed in the gap between the casing and the old pile. There is no need to lock the drill hammer between the casing and the old pile by hammering it downward by a machine, which effectively improves work efficiency and saves construction costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the overall structure of the drill hammer structure for the casing-twisting cast-in-place pile provided by the utility model;
[0017] Figure 2 This is a schematic diagram of the drill hammer structure of the present invention for use with a casing-twisting cast-in-place pile;
[0018] Figure 3 The utility model is a schematic diagram of the cross-sectional structure of a drill hammer structure for a casing-twisting cast-in-place pile provided by the utility model.
[0019] Description of reference numerals:
[0020] 1. Drill hammer; 2. Cavity; 3. Servo motor; 4. Threaded rod; 5. U-shaped rod; 6. Extrusion plate; 7. Casing; 8. Old pile; 9. Connecting plate; 10. Threaded hole; 11. Limit rod; 12. Limit hole; 13. Connecting groove; 14. Connector; 15. Cover plate. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0022] The implementation of the present invention is described in detail below with reference to specific embodiments.
[0023] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0024] Reference Figure 1-3 The figure shows a preferred embodiment of the present invention.
[0025] The drill hammer structure for cooperating with casing to twist off the cast-in-place pile includes a drill hammer 1, a casing 7 and an old pile 8. The casing 7 is sleeved on the old pile 8, and the drill hammer 1 is located in the gap between the casing 7 and the old pile 8. A cavity 2 is opened on the drill hammer 1, and a servo motor 3 is arranged in the cavity 2. A threaded rod 4 is installed on the output shaft of the servo motor 3, and the end of the threaded rod 4 away from the servo motor 3 is installed on the wall of the cavity 2. A U-shaped rod 5 is threadedly connected to the threaded rod 4, and both ends of the U-shaped rod 5 near its opening pass through the drill hammer 1 and are connected to the same extrusion plate 6.
[0026] When the drill hammer 1 is in use, the worker places the drill hammer 1 into the gap between the casing 7 and the old pile 8, and then starts the servo motor 3. The servo motor 3 rotates, thereby driving the threaded rod 4 connected to it to rotate synchronously, causing the U-shaped rod 5 threadedly connected thereto to move in a direction away from the servo motor 3, thereby driving the extrusion plate 6 connected to the U-shaped rod 5 to move toward the old pile 8 until the old pile 8 is pressed between the extrusion plate 6 and the inner wall of the casing 7. When the drill hammer 1 is in use, it only needs to be manually placed in the gap between the casing 7 and the old pile 8. There is no need to use a machine to hammer the drill hammer 1 downward to lock the drill hammer 1 between the casing 7 and the old pile 8, which effectively improves work efficiency and saves construction costs.
[0027] Specifically, in this embodiment, a connecting plate 9 is installed in the cavity 2, and the upper and lower ends of the connecting plate 9 are respectively installed on the top wall and the bottom wall of the cavity 2. The servo motor 3 is installed on the connecting plate 9, and its output shaft passes through the connecting plate 9 and is connected to the threaded rod 4.
[0028] The connection plate 9 enables the servo motor 3 to be installed in the cavity 2 , providing support for the installation of the servo motor 3 , thereby ensuring a smooth output of power.
[0029] Specifically, in this embodiment, a threaded hole 10 is formed at a position of the U-shaped rod 5 corresponding to the threaded rod 4 , and the threaded hole 10 is adapted to the threaded rod 4 .
[0030] By providing the threaded hole 10 , the threaded rod 4 can be threadedly connected to the U-shaped rod 5 , so that when the threaded rod 4 rotates, the U-shaped rod 5 threadedly connected thereto can be driven to move synchronously.
[0031] Specifically, in this embodiment, a limiting rod 11 is installed on the connecting plate 9 , and the end of the limiting rod 11 away from the connecting plate 9 is installed on the wall of the cavity 2 , and the end of the U-shaped rod 5 away from the threaded rod 4 is slidably installed on the limiting rod 11 .
[0032] By setting the limiting rod 11, the U-shaped rod 5 cannot be affected by the threaded rod 4 and rotated, so that the U-shaped rod 5 can only move back and forth along the direction of the limiting rod 11, thereby achieving the purpose of the extrusion plate 6 approaching or moving away from the old pile 8.
[0033] Specifically, in this embodiment, a limiting hole 12 is provided at a position of the U-shaped rod 5 corresponding to the limiting rod 11 , and the limiting hole 12 is adapted to the limiting rod 11 .
[0034] The setting of the limiting hole 12 enables the U-shaped rod 5 to be slidably mounted on the limiting rod 11 , thereby providing a guarantee for the movement of the U-shaped rod 5 on the limiting rod 11 .
[0035] Specifically, in this embodiment, two connecting grooves 13 are provided on the drill hammer 1. The two connecting grooves 13 are communicated with the cavity 2 and are adapted to the two ends of the U-shaped rod 5 near the opening.
[0036] By setting the two connecting grooves 13, the two ends of the U-shaped rod 5 can be connected to the extrusion plate 6 through the corresponding connecting grooves 13, so that the distance between the extrusion plate 6 and the old pile 8 can be controlled by moving the U-shaped rod 5, thereby completing the restriction of the old pile 8.
[0037] Specifically, in this embodiment, a connecting piece 14 is installed on the top of the drill hammer 1 .
[0038] The provision of the connecting piece 14 facilitates the worker to connect the lifting rope to the drill hammer 1 via the connecting piece 14 , thereby meeting the requirement of the machine to move the drill hammer 1 into the casing 7 via the lifting rope.
[0039] Specifically, in this embodiment, the drill hammer 1.
[0040] By setting the cover plate 15, the cavity 2 can be isolated from the outside of the drill hammer 1, thereby preventing external dust from entering the cavity 2 and affecting the use of the drill hammer 1. At the same time, it is convenient for the staff to open the cavity 2 by removing the cover plate 15 to maintain the drill hammer 1.
[0041] Specifically, in this embodiment, the corners of the bottom ends of the drill hammer 1 and the extrusion plate 6 that are away from each other are both provided with inclined surfaces.
[0042] The provision of the inclined surface makes it easier for the drill hammer 1 to be inserted between the casing 7 and the old pile 8 .
[0043] Specifically, in this embodiment, the drill hammer 1 is composed of several trapezoidal steel plates, the upper bases of the several trapezoidal steel plates are longer than the length of their lower bases, the upper bases of the several trapezoidal steel plates constitute the top of the drill hammer 1, the lower bases are the bottom of the drill hammer 1, and the curvature of the drill hammer 1 fits with the inner wall of the casing 7.
[0044] Since the drill hammer 1 is made of a trapezoidal steel plate, the drill hammer 1 has high strength and will not be deformed by force when in contact with the old pile 8. At the same time, the bottom cross-sectional area of the drill hammer 1 is larger than its bottom cross-sectional area, so that the drill hammer 1 can effectively contact the old pile 8, increasing the friction between the two, and providing convenience for the subsequent removal of the old pile 8.
[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A drill hammer structure for a casing-twisting bored pile, comprising a drill hammer, a casing and an old pile, characterized in that: The casing is sleeved on the old pile, and the drill hammer is located in the gap between the casing and the old pile. A cavity is opened on the drill hammer, and a servo motor is arranged in the cavity. A threaded rod is installed on the output shaft of the servo motor, and one end of the threaded rod away from the servo motor is installed on the wall of the cavity. A U-shaped rod is threadedly connected to the threaded rod, and both ends of the U-shaped rod near its opening pass through the drill hammer and are connected to the same extrusion plate.
2. The drill hammer structure for the casing-twisting bored pile according to claim 1, characterized in that: A connecting plate is installed in the cavity, and the upper and lower ends of the connecting plate are respectively installed on the top wall and the bottom wall of the cavity. The servo motor is installed on the connecting plate, and its output shaft passes through the connecting plate and is connected to the threaded rod.
3. The drill hammer structure for the bored pile with casing twisting off as claimed in claim 1, characterized in that: A threaded hole is provided at a position of the U-shaped rod corresponding to the threaded rod, and the threaded hole is adapted to the threaded rod.
4. The drill hammer structure for the bored pile with a casing twist-off according to claim 2, characterized in that: A limiting rod is installed on the connecting plate, one end of the limiting rod away from the connecting plate is installed on the wall surface of the cavity, and one end of the U-shaped rod away from the threaded rod is slidably installed on the limiting rod.
5. The drill hammer structure for the bored pile with casing twisting off as claimed in claim 1, characterized in that: A limiting hole is provided at a position of the U-shaped rod corresponding to the limiting rod, and the limiting hole is adapted to the limiting rod.
6. The drill hammer structure for the casing-twisting bored pile according to claim 1, characterized in that: The drill hammer is provided with two connecting grooves, which are communicated with the cavity and matched with the two ends of the U-shaped rod close to the opening.
7. The drill hammer structure for the casing-twisting bored pile according to claim 1, characterized in that: A connecting piece is installed on the top of the drill hammer.
8. The drill hammer structure for the casing-twisting bored pile according to claim 1, characterized in that: A cover plate is movably mounted on the outer curved surface of the drill hammer, and the cover plate is matched with a notch formed by the cavity on the drill hammer.
9. The drill hammer structure for casing-twisting bored piles according to claim 1, characterized in that: The corners of the drill hammer and the bottom end of the extrusion plate that are away from each other are both provided with inclined surfaces.
10. The drill hammer structure for the casing-twisting bored pile according to claim 8, characterized in that: The drill hammer is composed of several trapezoidal steel plates, the upper bases of the several trapezoidal steel plates are longer than the lower bases, the upper bases of the several trapezoidal steel plates constitute the top of the drill hammer, the lower bases are the bottom of the drill hammer, and the curvature of the drill hammer fits the inner wall of the casing.