A limit device for a pile hammer sleeve that is easy to install and remove

Abstract

The present invention discloses a limit device for a pile driving hammer sleeve that is easy to install and disassemble, including a hammer sleeve. One end of the hammer sleeve is connected to a pile driving hammer, and the other end of the hammer sleeve is used to sleeve a steel pipe pile. There are 8 sets of limit devices provided on the inner wall of the hammer sleeve. The limit device includes two fixed clamping plates and a movable clamping plate. The two fixed clamping plates are symmetrically welded on the inner wall of the hammer sleeve. The movable clamping plate is placed in the gap between the two fixed clamping plates. A groove is provided at the upper end of the fixed clamping plate, and a convex rib is provided on the movable clamping plate. The movable clamping plate is supported on the fixed clamping plate through the cooperation of the convex rib and the groove. The fixed clamping plate and the movable clamping plate are limited and fixed through a fixing bolt. Compared with the existing method of welding rib plates inside the hammer sleeve, the present invention only needs to replace the movable clamping plate for steel pipe piles of different sizes, effectively improving the construction efficiency, shortening the working hours, and saving a large amount of steel plate materials, and avoiding irreversible loss and damage to the base material of the hammer sleeve caused by repeated chiseling and welding.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic pile hammers, and particularly to a limit device for a pile hammer sleeve that is easy to load and unload. Background Art

[0002] In the operation fields such as the construction of jacket pile foundations for offshore oil engineering and the construction of pile foundations for offshore wind power foundations, hydraulic pile hammers are widely used as key construction equipment. It generates a large amount of energy hammering through the hammer core hydraulic system to sink steel pipe piles to a predetermined depth on the seabed.

[0003] The general structure of a hydraulic pile hammer includes: a hammer body, a dolly anvil, a hammer sleeve, etc. The inner diameter of the hammer sleeve is generally slightly larger than the outer diameter of the steel pipe pile. Its function is to enable the pile hammer to smoothly sleeve onto the steel pipe pile and maintain the stability of the position of the pile hammer during the hammering operation. Its structure and materials are special and the price is high.

[0004] For offshore jacket foundations, the diameters of steel pipe piles often vary according to different bearing capacities and geological conditions. Even at different positions in the same project, there are differences in the diameters of steel pipe piles. In order to meet the requirements of different pile diameter sizes, pile hammer users often purchase hammer sleeves according to the maximum pile diameter required. When it is necessary to be used for operations with a smaller pile diameter, stiffening plates are welded inside the hammer sleeve to achieve the change of the applicable pile diameter. However, the disadvantages of this method are: first, it wastes materials and working hours, requiring a large amount of steel plate materials and welding materials, and each time the pile diameter is changed, the old stiffening plates need to be removed and new ones welded; second, long-term repeated welding causes irreversible damage to the base material of the hammer sleeve. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a limit device for a pile hammer sleeve that is easy to load and unload, which can replace limit devices of different specifications according to different diameters of steel pipe piles, enabling the hammer sleeve to meet the sleeving of steel pipe piles of different sizes; and the limit device is welded once, and there is no need to repeatedly remove and weld during loading and unloading, which can save welding materials and avoid the damage to the base material of the hammer sleeve caused by repeated welding.

[0006] To solve the above problems, the present invention adopts the following technical solutions:

[0007] An easy-to-install and disassemble pile hammer sleeve limiting device, including a hammer sleeve, one end of the hammer sleeve is connected to a pile hammer, and the other end of the hammer sleeve is used for sleeving a steel pipe pile. At least 6 sets of limiting devices are arranged on the inner wall of the hammer sleeve. The limiting device includes two fixed clamping plates and a movable clamping plate. The two fixed clamping plates are symmetrically welded to the inner wall of the hammer sleeve left and right. There is a gap between the two fixed clamping plates. The movable clamping plate is placed in the gap between the two fixed clamping plates, and the side of the movable clamping plate protrudes from between the two fixed clamping plates; a groove is provided on the fixed clamping plate facing the end where the hammer sleeve is connected to the pile hammer, and a rib adapted to the groove is provided on the side surface of the movable clamping plate. Through the cooperation of the rib and the groove, the movable clamping plate is supported on the fixed clamping plate.

[0008] Furthermore, it also includes a fixing bolt. The fixing bolt penetrates through the two fixed clamping plates and the movable clamping plate, and both ends of the fixing bolt are pressed against the fixed clamping plates on both sides respectively, for restricting the longitudinal displacement of the movable clamping plate between the two fixed clamping plates.

[0009] Furthermore, the width of the movable clamping plate is greater than the width of the fixed clamping plate, ensuring that the side of the movable clamping plate can protrude from between the two fixed clamping plates.

[0010] For the above-mentioned pile hammer sleeve limiting device, the width of the fixed clamping plate is designed as a fixed value. In the case of only welding the fixed clamping plate, the size of the hammer sleeve can be applicable to the diameter of a specific specification of steel pipe pile; the width of the movable clamping plate is slightly larger than the width of the fixed clamping plate, and different width specifications of movable clamping plates can be prepared in advance according to needs. If a smaller specification of steel pipe pile needs to be sleeved, only by installing or replacing different specifications of movable clamping plates can the inner diameter size of the hammer sleeve be changed.

[0011] Even further, 8 sets of the limiting devices are arranged on the inner wall of the hammer sleeve, and each set of limiting devices is equally divided at 45°.

[0012] Preferably, relief holes are provided on the movable clamping plate. On the premise of meeting the structural strength, relief holes are provided on the movable clamping plate to reduce the weight of the clamping plate, facilitating the disassembly and assembly of the clamping plate.

[0013] Preferably, the ends of the fixed clamping plate and the movable clamping plate facing the steel pipe pile are provided with a chamfer slope of 30° - 40°, facilitating the pile hammer to hammer the pile sleeve.

[0014] Preferably, anti-tilting elbow plates are provided on the outer side of the fixed clamping plate. The anti-tilting elbow plates are welded and fixed on the inner wall of the hammer sleeve. By adding anti-tilting elbow plates, the clamping plate can be fixed, and the overall structural strength of the limiting device can be increased.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] In the present invention, at least six pairs of fixed clamping plates are arranged around the inner wall of the hammer sleeve. Between each pair of fixed clamping plates, movable clamping plates of different specifications are installed according to the diameter sizes of different steel pipe piles, so as to fill the gap between the hammer sleeve and the steel pipe pile, and further achieve the purpose of enabling the hammer sleeve to be stably sleeved on steel pipe piles of different sizes. Compared with the existing method of welding rib plates inside the hammer sleeve, in the present invention, only the movable clamping plates need to be replaced for different-sized steel pipe piles. This not only has simple operation, can effectively improve the construction efficiency and shorten the working hours, but also does not require repeated chiseling and welding of new steel plate materials on the inner wall of the hammer sleeve, saving a large amount of materials and avoiding irreversible loss and damage to the base material of the hammer sleeve caused by repeated chiseling and welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is a top view of the overall structure of the present invention;

[0019] Figure 3 is a three-dimensional schematic diagram of the overall structure of the limiting device in the embodiment of the present invention;

[0020] Figure 4 is a three-dimensional structural schematic diagram of the fixed clamping plate in the embodiment of the present invention;

[0021] Figure 5 is a three-dimensional structural schematic diagram of the movable clamping plate in the embodiment of the present invention.

[0022] In the figure: 1 - hammer sleeve, 2 - limiting device, 3 - fixed clamping plate, 4 - movable clamping plate, 5 - anti-tilting elbow plate, 6 - convex rib, 7 - groove, 8 - bolt hole, 9 - lightening hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions of the present invention will be described in detail below in combination with the drawings and embodiments, so that those of ordinary skill in the art can better understand and implement the technical solutions of the present invention.

[0024] The present invention provides a kind of easily detachable pile driving hammer sleeve limiting device as shown in Figures 1-5 which includes a hammer sleeve 1. One end of the hammer sleeve 1 is connected to a pile driving hammer, and the other end of the hammer sleeve 1 is used for sleeving a steel pipe pile; hereinafter, the end of the hammer sleeve 1 connected to the pile driving hammer will be regarded as the upper end, and the end of the hammer sleeve 1 used for sleeving the steel pipe pile will be regarded as the lower end for description.

[0025] In order to ensure the accuracy of the pile sleeving of the hammer sleeve 1 after installing the limiting device 2, at least six sets of limiting devices 2 need to be arranged on the inner wall of the hammer sleeve 1. In this embodiment, as shown in Figure 1As shown in the figure, 8 sets of limiting devices 2 are arranged around the inner wall of the cylindrical hammer sleeve. The angle between each set of limiting devices 2 is equally divided by 45°. Each limiting device 2 includes two fixed clamping plates 3 and one movable clamping plate 4. The two fixed clamping plates 3 are symmetrically welded to the inner wall of the hammer sleeve 1 on the left and right. There is a gap between the two fixed clamping plates 3. The movable clamping plate 4 is placed in the gap between the two fixed clamping plates 3. The movement of the movable clamping plate 4 is restricted by the fixed clamping plates 3 on both sides, playing a role in fixing the movable clamping plate 4. A groove 7 is provided at the upper end of the fixed clamping plate 3, and a rib 6 adapted to the groove 7 is provided on the upper part of the movable clamping plate 4. Through the mutual cooperation between the rib 6 and the groove 7, the movable clamping plate 4 is supported on the fixed clamping plate 3.

[0026] Bolt holes 8 are provided on both the two fixed clamping plates 3 and the movable clamping plate 4. After the movable clamping plate 4 is installed, a fixing bolt is used to pass through the bolt holes 8 on the fixed clamping plate 3 and the movable clamping plate 4, and the two ends of the fixing bolt are pressed against the fixed clamping plates 3 on both sides, which can play a role in preventing the movable clamping plate 4 from having a longitudinal displacement between the two fixed clamping plates 3 and preventing the movable clamping plate 4 from falling off during the hammering process. Preferably, the fixing bolt should adopt a model with a nut anti-detaching pin.

[0027] In the present invention, taking the width of the fixed clamping plate 3 as a fixed value, the width of the movable clamping plate 4 is greater than the width of the fixed clamping plate 3, so that the movable clamping plate 4 can protrude from the sides of the two fixed clamping plates 3. In the case of only installing the fixed clamping plates 3, the size of the hammer sleeve 1 is applicable to the diameter of a specific specification of steel pipe pile. If it is necessary to use steel pipe piles of other smaller specifications, the movable clamping plate 4 can be installed between the two fixed clamping plates 3, and the outer wall of the steel pipe pile can be resisted by the movable clamping plate 4, so as to make the hammer sleeve 1 tightly sleeved on the steel pipe pile. And different specifications of movable clamping plates 4 can be replaced according to different diameters of steel pipe piles, so as to meet the socketing of the hammer sleeve 1 to steel pipe piles of different diameter sizes.

[0028] Specifically, in this embodiment, the diameter of the steel pipe pile of the booster station foundation is 3200 mm, and the diameters of the steel pipe piles of the fan foundation are 3000 mm and 2900 mm. The original inner diameter of the pile hammer hammer sleeve 1 is 3720 mm, and the width of the fixed clamping plate 3 is 250 mm. After the fixed clamping plate 3 is installed on the inner wall of the hammer sleeve 1, the inner diameter of the hammer sleeve 1 becomes 3220 mm, which is applicable to the steel pipe pile of the booster station foundation with an outer diameter of φ3200 mm. When it is necessary to drive the steel pipe pile of the φ3000 mm fan foundation, the movable clamping plate 4 with a width of 350 mm is installed in place, and the inner diameter of the hammer sleeve 1 becomes 3020 mm, which can meet the construction requirements. When it is necessary to drive the steel pipe pile of φ2900 mm, the movable clamping plate 4 with a width of 400 mm is replaced, and the construction requirements can be met.

[0029] In this embodiment, two anti-tilting elbow plates 5 are provided on the outer side of each fixed clamping plate 3. The anti-tilting elbow plates 5 are welded and fixed to the inner wall of the hammer sleeve 1. By adding the anti-tilting elbow plates 5, the fixed clamping plate 3 can be fixed, and the overall structural strength of the limiting device 2 can be enhanced.

[0030] On the premise of meeting the structural strength, a relief hole 9 is provided on the movable clamping plate 4 of the present invention to reduce the weight of the movable clamping plate 4, facilitating the disassembly and assembly of the movable clamping plate 4.

[0031] Preferably, a chamfer slope of 30° - 40° is provided at the lower ends of the fixed clamping plate 3 and the movable clamping plate 4, which can facilitate the pile hammer to hammer the pile sleeve.

[0032] The above embodiments are only relatively preferred embodiments of the present invention, but they cannot be used as a limitation to the invention. Any variations and improvements made based on the concept of the present invention should fall within the protection scope of the present invention. The specific protection scope shall be subject to the claims.

Claims

1. An easily detachable and installable limiting device for a pile hammer sleeve, comprising a hammer sleeve, one end of the hammer sleeve is connected to a pile hammer, and the other end of the hammer sleeve is used for sleeving a steel pipe pile, characterized in that: There are at least 6 sets of limiting devices arranged on the inner wall of the hammer sleeve. The limiting device includes two fixed clamping plates and a movable clamping plate. The two fixed clamping plates are symmetrically welded on the inner wall of the hammer sleeve. There is a gap between the two fixed clamping plates. The movable clamping plate is placed in the gap between the two fixed clamping plates, and the side of the movable clamping plate protrudes from between the two fixed clamping plates. A groove is provided at one end of the fixed clamping plate facing the connection between the hammer sleeve and the pile hammer. A convex rib adapted to the groove is provided on the side surface of the movable clamping plate. The movable clamping plate is supported on the fixed clamping plate by the cooperation of the convex rib and the groove.

2. The limit device for the easily detachable pile hammer sleeve according to claim 1, characterized in that: It further includes a fixing bolt. The fixing bolt penetrates through the two fixed clamping plates and the movable clamping plate, and both ends of the fixing bolt are respectively pressed against the fixed clamping plates on both sides to limit the longitudinal displacement of the movable clamping plate between the two fixed clamping plates.

3. The limit device for the easily detachable pile hammer sleeve according to claim 1 or 2, characterized in that: The width of the movable clamping plate is greater than the width of the fixed clamping plate.

4. The limit device for the pile hammer sleeve that is easy to load and unload according to claim 3, wherein: There are 8 sets of the limiting devices arranged on the inner wall of the hammer sleeve, and the angle between each set of limiting devices is equally divided at 45°.

5. The limit device for a pile hammer sleeve that is easy to disassemble and assemble according to claim 4, characterized in that: Relieving holes are provided on the movable clamping plate.

6. The limit device for the pile hammer sleeve that is easy to disassemble and assemble according to claim 5, characterized in that: The ends of the fixed clamping plate and the movable clamping plate facing the part of the hammer sleeve for sleeving the steel pipe pile are provided with a chamfering slope of 30° - 40°.

7. An easy-to-install and disassemble pile hammer sleeve limiting device according to claim 6, characterized in that: An anti-tilting elbow plate is provided on the outer side of the fixed clamping plate, and the anti-tilting elbow plate is welded and fixed on the inner wall of the hammer sleeve.

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