A dynamic compaction equipment and method for soft soil foundation construction

Abstract

This invention relates to the field of engineering foundation technology, and in particular to a dynamic compaction device for soft soil foundation construction, comprising a lifting body; slings, an inner hammer, and an outer hammer disposed outside the inner hammer, all mounted on the lifting body; a drainage component inside the inner hammer, including a conveying hole and a drainage hole; a pumping chamber inside the outer hammer, containing a filter and a transmission component; the filter includes an outer filter plate and an inner filter plate. This invention, through the interlocking inner and outer hammers, allows for two compactions of the soft soil foundation in a single hammering operation, improving the compaction effect. Furthermore, during the second compaction, the inner hammer can filter water pressure from the bottom of the outer hammer into the pumping chamber, and the downward pressure of the inner hammer forces the water in the pumping chamber upward through the drainage component, achieving automatic drainage during the compaction process and improving the efficiency of dynamic compaction construction.

Description

Technical Field

[0001] This invention relates to the field of engineering construction technology, specifically to a dynamic compaction device and method for dynamic compaction construction of soft soil foundations. Background Technology

[0002] Dynamic compaction equipment is a type of mechanical equipment that uses a heavy hammer to impact and compact the foundation by free-falling from a height. Its core principle is to use the impact force of the hammer to improve the density and bearing capacity of the foundation, causing soil particles to rearrange, pores to be compressed, and water and air to be expelled, thereby improving the density and bearing capacity of the foundation. Soft soil foundation is a weak soil layer with high natural water content, large void ratio, low shear strength, and high compressibility, which requires the use of dynamic compaction equipment to improve the density of the foundation.

[0003] Because soft soil foundations have a high natural water content, water will continuously seep into the ramming hole and accumulate inside the ramming hole during the impact compaction process using dynamic compaction equipment. The accumulated water will affect the compaction effect, requiring intermittent stopping of the hammer to drain the water by inserting pipes or digging drainage ditches, which prolongs the compaction interval and results in low efficiency of dynamic compaction construction. Summary of the Invention

[0004] In view of the problem that the treatment of water accumulation in the ramming hole in the above or existing technologies affects the ramming efficiency, the present invention is proposed.

[0005] Therefore, the object of this invention is to provide a dynamic compaction device for dynamic compaction construction on soft soil foundations, comprising,

[0006] Including the crane body;

[0007] The hoisting sling is mounted on the hoisting machine body; the inner ramming hammer is mounted at the end of the hoisting sling; and the outer ramming hammer is mounted outside the inner ramming hammer.

[0008] The internal tamping hammer is equipped with a drainage component, including a conveying hole disposed inside the internal tamping hammer and a drainage hole disposed inside the conveying hole.

[0009] The external ramming hammer has a pumping chamber inside, a filter element inside the pumping chamber, and a transmission element outside the filter element.

[0010] The filter element includes an outer filter plate disposed at the end of the outer hammer and an inner filter plate disposed inside the outer filter plate;

[0011] The inner ramming hammer drives the inner filter plate downward through the transmission component, causing the water in the ramming hole to be filtered and pressurized into the pumping chamber. The downward movement of the inner ramming hammer compresses the space inside the pumping chamber, causing the water to be discharged from the drain hole of the drain component.

[0012] As a preferred embodiment of the dynamic compaction equipment for soft soil foundation construction of the present invention, the drainage component further includes a pipe joint disposed outside the inner hammer. The pipe joint is used to connect an external drainage pipe to transport water discharged from the hammer. The drainage hole extends into the inside of the pipe joint, and the outer hammer is provided with an inner edge protrusion.

[0013] As a preferred embodiment of the dynamic compaction equipment for soft soil foundation construction of the present invention, it further includes a water pumping component disposed at the end of the inner filter plate, including a water pumping cover disposed at the end of the inner filter plate, the water pumping cover having multiple water pumping holes on its exterior, and a water delivery cylinder disposed on the exterior of the water pumping cover, the water delivery cylinder extending and retracting vertically within the delivery hole.

[0014] As a preferred embodiment of the dynamic compaction equipment for soft soil foundation construction of the present invention, the surface of the inner filter plate is an annular inclined surface with a height decreasing towards the center, the outer side of the inner filter plate has multiple filter holes, the filter holes are provided with filter screens, the outer side of the outer filter plate has multiple filter grooves, and the end of the outer filter plate is provided with multiple sealing plugs.

[0015] As a preferred embodiment of the dynamic compaction equipment for soft soil foundation construction of the present invention, the transmission component includes a transmission cylinder disposed inside the outer hammer, a transmission interlayer is provided inside the outer hammer, the transmission cylinder moves vertically up and down inside the transmission interlayer, multiple transmission sliders are provided outside the inner hammer, a first sliding groove is provided outside the transmission interlayer, the transmission sliders move vertically within the first sliding groove, multiple connecting sliders are provided outside the inner filter plate, a transmission column is provided at the end of the connecting slider, multiple second sliding grooves are provided outside the transmission interlayer, and the connecting sliders move vertically along the second sliding grooves.

[0016] As a preferred embodiment of the dynamic compaction equipment for soft soil foundation construction of the present invention, the transmission cylinder has a connecting hole on its outside, the transmission column is inserted into the connecting hole, the connecting hole has a telescopic hole inside, the transmission cylinder has multiple sliding pins on its outside, the transmission interlayer has multiple switching grooves inside, the switching groove is composed of two parallel intersecting vertical grooves and an arc groove connecting the two vertical grooves, and the sliding pins slide in the switching groove.

[0017] As a preferred embodiment of the dynamic compaction equipment for soft soil foundation construction of the present invention, a locking block is provided inside the connecting hole, and a locking groove is opened on the outside of the transmission column, and the locking block is inserted into the locking groove.

[0018] As a preferred embodiment of the dynamic compaction equipment for soft soil foundation construction of the present invention, the cleaning component includes a threaded groove disposed on the outside of the inner hammer, a water inlet groove disposed inside the threaded groove, a threaded cap threadedly connected to the threaded groove, a sealing cylinder inserted into the water inlet groove at the end of the threaded cap, and multiple connecting ears disposed on the outside of the inner hammer for connecting slings.

[0019] As a preferred embodiment of the dynamic compaction equipment for soft soil foundation construction of the present invention, it further includes a one-way valve disposed inside the water delivery cylinder, including a fixed ring disposed inside the water delivery cylinder, a movable ring plate disposed outside the fixed ring, an installation block disposed inside the water delivery cylinder, a sealing column disposed at the end of the installation block, the sealing column being inserted into the movable ring plate, a lifting slide groove disposed inside the water delivery cylinder, a spring disposed inside the lifting slide groove, and a water spray groove disposed inside the lifting slide groove.

[0020] To better achieve the objectives of this invention, this invention also provides a construction method for dynamic compaction of soft soil foundations, comprising the following steps:

[0021] Step 1: Remove surface debris, level the site, estimate the ground deformation after compaction, adjust the elevation of the crane to the design requirements, and lay a 1.0-2.0 meter thick sand and gravel cushion layer to enhance the bearing capacity of the foundation;

[0022] Step 2: Mark the positions of the first compaction points with lime or wooden stakes to ensure that the layout conforms to the design. Use a level to measure the site elevation and record the data for later comparison.

[0023] Step 3: The lifting equipment enters the site, aligns the external tamping hammer with the tamping point, ensures that the external tamping hammer is stable and centered, and measures the elevation of the hammer top before tamping as the benchmark for recording the tamping depth.

[0024] Step 4: The lifting equipment lifts the inner and outer tamping hammers to the predetermined height, and then the control equipment releases the hook to allow the hammers to fall freely. After the outer tamping hammer falls and hits the tamping point, the inner tamping hammer hits the outer tamping hammer again to perform a second tamping. During the second tamping of the inner tamping hammer, the filter, pump and drainage components are used to draw the water in the tamping hole into the tamping hammer and then discharge it from the dynamic compaction construction area. Then the inner tamping hammer and the outer tamping hammer are lifted to the predetermined height again for tamping.

[0025] Step 5: Use a bulldozer to fill the ramming pit, ensuring the site is flat. Perform low-energy full compaction according to the design requirements to compact the loose surface soil, improve the uniformity of the foundation, and measure the elevation of the site after compaction to ensure it meets the design requirements.

[0026] Step Six: Place the outer ramming hammer on the ground using the hoisting machine, and flush it with water by injecting water into the outer ramming hammer through the cleaning device.

[0027] The beneficial effects of this invention are:

[0028] 1. This invention uses a socketed inner and outer tamping hammer to perform two tamping blows on a soft soil foundation in a single tamping operation, improving the compaction effect. During the second tamping blow, the inner tamping hammer can filter the water pressure at the bottom of the outer tamping hammer into the pumping chamber, and the water in the pumping chamber is discharged upward through the drainage device by the downward pressure of the inner tamping hammer, realizing automatic drainage during the tamping process and improving the efficiency of dynamic compaction construction.

[0029] 2. This invention allows clean water to be introduced from the top into the interior of the outer ramming hammer after construction is completed, cleaning the outer and inner filter plates in the filter element. With the help of a one-way valve, the poured-in cleaning water can be sprayed from the top of the outer ramming hammer to all four sides, so that the water can evenly clean the filter holes on the inner filter plate, improving the cleaning effect. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the overall structure of dynamic compaction equipment and methods used for dynamic compaction construction on soft soil foundations;

[0032] Figure 2 A schematic diagram of the inner and outer hammer structures of dynamic compaction equipment and methods for soft soil foundation construction.

[0033] Figure 3 Cross-sectional view of the internal structure of the inner and outer hammers of the dynamic compaction equipment and method used for dynamic compaction construction on soft soil foundations.

[0034] Figure 4 A schematic diagram of the filter structure for dynamic compaction equipment and methods used in dynamic compaction construction on soft soil foundations;

[0035] Figure 5 A schematic diagram of the transmission structure of dynamic compaction equipment and methods for soft soil foundation construction;

[0036] Figure 6 Enlarged view of area A for dynamic compaction equipment and methods used in dynamic compaction construction of soft soil foundations;

[0037] Figure 7 Cross-sectional view of the internal structure of the external hammer of dynamic compaction equipment and methods for soft soil foundation construction;

[0038] Figure 8 A schematic diagram of the pumping component structure for dynamic compaction equipment and methods used in soft soil foundation construction;

[0039] Figure 9 A schematic diagram of the cleaning component structure for dynamic compaction equipment and methods used in dynamic compaction construction on soft soil foundations;

[0040] Figure 10 Enlarged view of area B showing the dynamic compaction equipment and methods used in dynamic compaction construction of soft soil foundations.

[0041] In the diagram: 1. Lifting machine body; 11. Lifting sling; 2. Inner ram; 21. Drainage component; 211. Conveying hole; 212. Drainage hole; 213. Pipe joint; 22. Cleaning component; 221. Threaded cap; 222. Sealing cylinder; 223. Water inlet trough; 224. Threaded groove; 23. Connecting lug; 3. Outer ram; 31. Pumping chamber; 311. Inner edge protrusion; 32. Filter component; 321. Outer filter plate; 322. Filter tank; 323. Inner filter plate; 324. Filter hole; 325. Sealing plug; 33. Transmission component; 331. Transmission cylinder; 332 333. Sliding pin; 334. Transmission slider; 335. Connecting slider; 336. Transmission column; 337. Locking block; 338. Locking groove; 339. Connecting hole; 34. Telescopic hole; 350. Pumping component; 36. Pumping cover; 37. Pumping hole; 38. Water delivery cylinder; 39. One-way valve; 301. Fixing ring; 302. Spring; 303. Movable ring plate; 31. Sealing column; 32. Mounting block; 334. Spraying channel; 355. Lifting slide; 36. Switching channel; 37. Transmission interlayer; 38. First slide; 39. Second slide. Detailed Implementation

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0044] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0045] Example 1, referring to Figures 1 to 8 This is the first embodiment of the present invention, which provides a dynamic compaction device for soft soil foundation construction, capable of automatically draining water accumulated in the compaction hole during the compaction process, including:

[0046] Lifting machine body 1;

[0047] Specifically, the hoisting cable 11 is installed on the hoisting machine body 1, the inner ramming hammer 2 is installed at the end of the hoisting cable 11, and the outer ramming hammer 3 is installed outside the inner ramming hammer 2;

[0048] Furthermore, the sling 11 installed on the lifting machine body 1, the lifting machine body 1 being a lifting machine in the prior art, the sling 11 being pulled upward by the winch equipment, the inner hammer 2 installed at the end of the sling 11, and the outer hammer 3 sleeved on the outside of the inner hammer 2;

[0049] Specifically, the inner tamping hammer 2 is provided with a drainage component 21, including a conveying hole 211 provided inside the inner tamping hammer 2 and a drainage hole 212 provided inside the conveying hole 211.

[0050] Furthermore, the inner tamping hammer 2 is equipped with a drainage component 21, including a conveying hole 211 opened inside the inner tamping hammer 2 and two symmetrical drainage holes 212 opened at the top of the conveying hole 211. The external opening of the drainage holes 212 is located on the top surface of the inner tamping hammer 2.

[0051] Specifically, the external ramming hammer 3 has a pumping chamber 31 inside, a filter element 32 inside the pumping chamber 31, and a transmission element 33 outside the filter element 32.

[0052] Furthermore, the outer ramming hammer 3 has a water pumping chamber 31 inside, a filter element 32 is installed inside the water pumping chamber 31, and a transmission element 33 is installed outside the filter element 32.

[0053] Specifically, the filter element 32 includes an outer filter plate 321 disposed at the end of the outer hammer 3 and an inner filter plate 323 disposed inside the outer filter plate 321.

[0054] Furthermore, the filter element 32 includes an outer filter plate 321 fixed to the bottom of the outer hammer 3 and an inner filter plate 323 movably connected inside the outer filter plate 321.

[0055] The inner hammer 2 drives the inner filter plate 323 to move downward through the transmission component 33, so that the water in the ramming hole is filtered and pressured into the pumping chamber 31. The downward movement of the inner hammer 2 compresses the internal space of the pumping chamber 31, so that the water is discharged from the drain hole 212 of the drain component 21.

[0056] Specifically, the drainage component 21 also includes a pipe joint 213 located outside the inner hammer 2. The pipe joint 213 is used to connect an external drainage pipe to transport water out of the hammer. The drainage hole 212 extends into the pipe joint 213. The outer hammer 3 has an inner edge protrusion 311 inside.

[0057] Furthermore, the drainage component 21 also includes a pipe joint 213 installed on the top of the inner hammer 2. The pipe joint 213 is used to connect an external drainage pipe to transport water out of the hammer. The water out of the hammer is transported out of the dynamic compaction construction area through an external water pipe. The opening of the drainage hole 212 is located inside the pipe joint 213. The top of the inner pumping chamber 31 of the outer hammer 3 is equipped with an annular inner edge protrusion 311. The inner hammer 2 is in the shape of an "I", which allows the inner hammer 2 to move downward and extend into the outer hammer 3. When the inner hammer 2 is lifted upward by the hoisting machine body 1, the inner edge protrusion 311 can drive the outer hammer 3 to be lifted upward.

[0058] Specifically, it also includes a water pumping component 34 disposed at the end of the inner filter plate 323, including a water pumping cover 341 disposed at the end of the inner filter plate 323, a plurality of water pumping holes 342 being provided on the outside of the water pumping cover 341, and a water delivery cylinder 343 being disposed on the outside of the water pumping cover 341, which extends and retracts vertically within the delivery hole 211.

[0059] Furthermore, it also includes a water pumping component 34 installed on the top of the inner filter plate 323, including a water pumping cover 341 installed on the top of the inner filter plate 323. The outer wall of the water pumping cover 341 has multiple water pumping holes 342, and multiple drainage holes 212 are equidistantly arranged around the outer side and top surface of the water pumping cover 341. A water delivery cylinder 343 is installed on the top of the water pumping cover 341. The water delivery cylinder 343 is inserted into the delivery hole 211 and fits into the delivery hole 211. When the water pumping cover 343 is tamped, it extends and retracts vertically in the delivery hole 211 as it is tamped or lifted.

[0060] Specifically, the surface of the inner filter plate 323 is an annular slope with a height decreasing towards the center. Multiple filter holes 324 are provided on the outside of the inner filter plate 323, and filter screens are provided inside the filter holes 324. Multiple filter grooves 322 are provided on the outside of the outer filter plate 321, and multiple sealing plugs 325 are provided at the end of the outer filter plate 321.

[0061] Furthermore, the surface of the inner filter plate 323 is an annular inclined surface with a height decreasing towards the center. Multiple through filter holes 324 are opened on the surface of the inner filter plate 323. The filter holes 324 are arranged in annular diffusion pattern. A filter screen is installed inside the filter holes 324. Multiple through filter grooves 322 are opened on the surface of the outer filter plate 321. The filter grooves 322 are arc-shaped grooves and arranged in annular pattern. Multiple sealing plugs 325 are provided at the end of the outer filter plate 321. When the inner filter plate 323 moves down onto the outer filter plate 321, the sealing plugs 325 seal the filter holes 324, so that the gas in the pumping chamber 31 cannot be discharged through the filter holes 324 when pumping water. As a result, when the inner hammer 2 descends, it squeezes the air in the pumping chamber 31 and forces the water out.

[0062] It should be noted that the filter screen inside the filter hole 324 is located at the top of the filter hole 324, and the sealing plug 325 is relatively short. When the sealing plug 325 is inserted into the filter hole 324, the sealing plug 325 will not touch the filter screen and cause the filter screen to break.

[0063] In summary, during dynamic compaction, after the outer hammer 3 is aligned with the compaction point, an external water supply pipe is connected through pipe joint 213. It should be noted that the external water supply pipe must be a flexible hose. The inner hammer 2 is lifted upwards using a lifting device. After the inner hammer 2 moves upwards and contacts the inner edge protrusion 311 at the bottom, the inner hammer 2 moves upwards along with the outer water supply to the predetermined elevation. Then, the operator uses a release mechanism or a release mechanism to separate the cable from the inner hammer 2. At this time, the outer hammer 3 and the inner hammer 2 fall freely to the compaction point. The outer hammer 3 first contacts the foundation and compacts a hole. Then, the inner hammer 2 falls downwards and extends into the outer hammer 3 to compact the outer hammer 3 again, achieving two compactions of a single hammer to flatten the soil and compact a hole at the compaction point. Then, the above lifting and compaction steps are repeated.

[0064] After multiple tamping operations, natural water seeps out and accumulates in the tamping hole. During this tamping, when the outer hammer 3 falls into the tamping hole, the water passes through the filter groove 322 on the outer filter plate 321 and enters the space between the outer filter plate 321 and the inner filter plate 323. Some of the soil in the tamping hole enters the filter groove 322. When the inner hammer 2 performs a second tamping operation, it drives the inner filter plate 323 downwards via a transmission mechanism. This downward movement of the inner filter plate 323 pressure filters the water between the inner filter plate 323 and the outer filter plate 321 to the top of the inner filter plate 323. Large particles of impurities in the water are blocked by the filter screen in the filter hole 324 at the bottom of the inner filter plate 323. After being filtered to the top of the inner filter plate 323, the water then flows along the annular slope towards the center of the top surface of the inner filter plate 323. As the inner filter plate 323 moves downwards to contact the outer filter plate 321, the sealing plug 325 on the outer filter plate 321 inserts into the filter hole 324 on the inner filter plate 323, preventing the air in the pumping chamber 31 from being discharged through the filter hole 324. At this time, the inner hammer 2 continues to move downwards to compress the air in the pumping chamber 31, thereby forcing the water in the pumping chamber 31 from the pumping hole 342 into the pumping hood 341. Then, the water that is forced in quickly rises through the water delivery cylinder 343 to the conveying hole 211. Then, the water is forced from the conveying hole 211 into the drain hole 212, and finally discharged from the opening of the drain hole 212 into the pipe joint 213. Finally, the water flows out of the dynamic compaction construction area through the external pipe, realizing the automatic discharge of water accumulated in the ramming hole during the ramming process.

[0065] Example 2, refer to Figures 3-7 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides structural optimization of the transmission component 33, which solves the problem of transmission and transmission unlocking of the inner ramming hammer 2 to the inner filter plate 323.

[0066] Specifically, the transmission component 33 includes a transmission cylinder 331 disposed inside the outer hammer 3, a transmission interlayer 37 is provided inside the outer hammer 3, the transmission cylinder 331 moves vertically up and down inside the transmission interlayer 37, multiple transmission sliders 333 are provided outside the inner hammer 2, a first slide groove 38 is provided outside the transmission interlayer 37, the transmission sliders 333 move vertically within the first slide groove 38, multiple connecting sliders 334 are provided outside the inner filter plate 323, a transmission column 335 is provided at the end of the connecting slider 334, multiple second slide grooves 39 are provided outside the transmission interlayer 37, and the connecting sliders 334 move vertically along the second slide grooves 39.

[0067] Furthermore, the transmission component 33 includes a transmission cylinder 331 movably connected inside the outer hammer 3. A transmission interlayer 37 is provided on the outer side of the pumping chamber 31 inside the outer hammer 3. The transmission cylinder 331 moves vertically up and down inside the transmission interlayer 37 during tamping and lifting. Multiple annularly arranged transmission sliders 333 are installed on the outer wall of the inner hammer 2. A vertical first groove 38 is provided on the inner wall of the transmission interlayer 37. The transmission sliders 333 move vertically within the first groove 38. Multiple annularly arranged connecting sliders 334 are installed on the outside of the inner filter plate 323. A transmission column 335 is installed on the top of the connecting sliders 334. Multiple vertical second grooves 39 are provided on the inner wall of the transmission interlayer 37. The connecting sliders 334 slide vertically along the second grooves 39.

[0068] Specifically, the transmission cylinder 331 has a connecting hole 338 on its outside, the transmission column 335 is inserted into the connecting hole 338, the connecting hole 338 has a telescopic hole 339 inside, the transmission cylinder 331 has multiple sliding pins 332 on its outside, the transmission interlayer 37 has multiple switching grooves 36 inside, the switching groove 36 is composed of two parallel intersecting vertical grooves and an arc groove connecting the two vertical grooves, and the sliding pins 332 slide in the switching groove 36.

[0069] Furthermore, a connecting hole 338 is provided at the bottom of the transmission cylinder 331, and the transmission column 335 is inserted into the connecting hole 338. A telescopic hole 339 is provided on one side of the bottom of the connecting hole 338, and the telescopic hole 339 communicates with the connecting hole 338. Multiple annularly arranged sliding pins 332 are installed on the outer wall of the transmission cylinder 331. Multiple switching grooves 36 are provided on the inner wall of the outer side of the transmission interlayer 37. The switching groove 36 is composed of two parallel intersecting vertical grooves and an arc groove connecting the two vertical grooves. The sliding pins 332 slide in the switching grooves 36. When the sliding pins 332 pass through the arc groove, they are squeezed by the arc surface of the arc groove, which will drive the transmission cylinder 331 to rotate, so that the transmission column 335 is aligned with the telescopic hole 339.

[0070] It should be noted that the width of the second slide groove 39 is greater than that of the connecting slider 334. When the transmission cylinder 331 rotates through the sliding pin 332, the connecting slider 334 has enough room to rotate, and the rotation of the transmission cylinder 331 will not be blocked by the second slide groove 39.

[0071] Specifically, a locking block 336 is provided inside the connecting hole 338, and a locking groove 337 is provided on the outside of the transmission column 335, with the locking block 336 inserted into the locking groove 337.

[0072] Furthermore, a locking block 336 is installed on the inner wall of the connecting hole 338, and a locking groove 337 is opened on the outer wall of the transmission column 335. The locking block 336 can be inserted into the locking groove 337, so that the transmission cylinder 331 can drive the transmission column 335 to move upward, thereby driving the inner filter plate 323 to move upward.

[0073] In summary, during the downward movement of the inner tamping hammer 2, the connecting slider 334 in the transmission component 33 drives the transmission cylinder 331 to move downward. At this time, the transmission column 335 is located inside the connecting hole 338. The downward movement of the transmission cylinder 331 drives the transmission column 335 to move downward, which in turn drives the inner filter plate 323 to move downward for pressure filtration and water intake. Simultaneously, the sliding pin 332 on the outer wall of the transmission cylinder 331 slides downward in the vertical area of ​​the slot 337. As the transmission cylinder 331 moves downward, when the inner filter plate 323 moves downward to contact the outer filter plate 321, the sliding pin 332 slides downward to the arc-shaped groove of the slot 337. At this time, during the downward movement of the sliding pin 332, it slides along the arc-shaped groove, causing the transmission cylinder 331 to rotate, causing the locking block 336 to disengage from the slot 337 of the transmission column 335, and simultaneously causing the transmission column 335 to disengage from the connecting hole 338 and connect with the telescopic hole. When 339 is aligned, the transmission column 335 is inserted into the telescopic hole 339, allowing the inner ramming hammer 2, which is linked with the transmission cylinder 331, to continue moving downward to squeeze and drain water. After the inner ramming hammer 2 drives the filter plate to perform filtration, the transmission to the inner filter plate 323 is released in the middle of the downward stroke, allowing the inner ramming hammer 2 itself to continue moving downward. During lifting, as the inner ramming hammer 2 is raised, the transmission cylinder 331 moves upward. When the sliding pin 332 on the transmission cylinder 331 moves to the arc groove on the slot 337, it slides along the arc groove to rotate and reset the transmission cylinder 331. At this time, the transmission column 335 re-enters the connecting hole 338, and the locking block 336 in the connecting hole 338 is inserted into the slot 337 of the transmission column 335. This causes the transmission cylinder 331 to move upward, which in turn drives the transmission column 335 to move upward, allowing the inner filter plate 323 to reset as the inner ramming hammer 2 moves upward.

[0074] Example 3, referring to Figures 8-10 This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a cleaning mechanism for the filter element 32 in the external ramming hammer 3 after the dynamic compaction construction is completed, which solves the problem of soil residue in the filter element 32.

[0075] Specifically, the cleaning component 22 includes a threaded groove 224 disposed on the outside of the inner tamping hammer 2, a water inlet groove 223 disposed inside the threaded groove 224, a threaded cap 221 connected to the threaded groove 224 by threads, a sealing cylinder 222 inserted into the water inlet groove 223 disposed at the end of the threaded cap 221, and a plurality of connecting ears 23 disposed on the outside of the inner tamping hammer 2, the connecting ears 23 being used to connect the sling 11.

[0076] Furthermore, the cleaning component 22 includes a threaded groove 224 opened in the middle of the top of the inner hammer 2. The bottom surface of the threaded groove 224 is provided with a water inlet groove 223 that communicates with the conveying hole 211. A threaded cap 221 is threadedly connected to the threaded groove 224. A sealing cylinder 222 that is movably inserted into the water inlet groove 223 and closes the water inlet groove 223 is installed at the end of the threaded cap 221. Multiple connecting ears 23 are provided on the outside of the inner hammer 2. The multiple connecting ears 23 are used to connect the sling 11.

[0077] Specifically, it also includes a one-way valve 35 installed inside the water delivery cylinder 343, including a fixed ring 351 installed inside the water delivery cylinder 343, a movable ring plate 353 installed outside the fixed ring 351, an installation block 355 installed inside the water delivery cylinder 343, a sealing post 354 installed at the end of the installation block 355, the sealing post 354 being inserted into the movable ring plate 353, a lifting slide groove 357 opened inside the water delivery cylinder 343, a spring 352 installed inside the lifting slide groove 357, and a water spray groove 356 opened inside the lifting slide groove 357.

[0078] Furthermore, it also includes a one-way valve 35 installed inside the water delivery cylinder 343, including a fixed ring 351 installed on the inner wall of the water delivery cylinder 343, a movable ring plate 353 movably connected to the bottom of the fixed ring 351, an installation block 355 installed on the inner wall of the water delivery cylinder 343, a sealing column 354 installed on the top of the installation block 355, the sealing column 354 inserted into the movable ring plate 353 and sealing the movable ring plate 353, a lifting slide groove 357 is opened on the inner wall of the water delivery cylinder 343, the movable ring plate 353 moves in the lifting slide groove 357, a spring 352 is installed in the lifting slide groove 357 between the fixed ring 351 and the movable ring plate 353, a plurality of annularly arranged spray channels 356 connected to the water pumping chamber 31 are opened on the inner wall of the lifting slide groove 357, and the spray channels 356 are sealed by the movable ring plate 353.

[0079] During the cleaning process after dynamic compaction, the outer hammer 3 is hoisted to the ground using the lifting machine body 1, while ensuring that the inner hammer 2 is in an inwardly lifted state. Then, the threaded cap 221 is unscrewed, and the sealing cylinder 222 is pulled outward through the threaded cap 221 to seal the two connecting pipe ends. Water is then injected through the threaded groove 224, entering the water inlet trough 223 from the threaded groove 224, and then flowing downward into the conveying hole 211. At this time, the movable ring plate 353 is pressed downward against the sealing column 354 by the pressure of the water flow and the spring 352, exposing the water spray groove 356. During the compaction and drainage, the water is pushed down by the pressure... When the force passes through the movable ring plate 353, it pushes the movable ring plate 353 upward, causing the sealing column 354 to disengage from the movable ring plate 353, allowing water to flow upward from the middle of the movable ring plate 353. At this time, the spray channel 356 is blocked by the upward-pushed movable ring plate 353, preventing the drained water from leaking back into the pumping chamber 31. In addition to realizing the basic function of the one-way valve, it also realizes the diffusion spraying of water during cleaning. Finally, the water sprays out from the spray channel 356 from the high point of the pumping chamber 31 to all four sides, so that the filter holes 324 on the outer and inner sides of the inner filter plate 323 can be rinsed.

[0080] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dynamic compaction apparatus for use in the construction of a soft ground foundation, characterised in that: Including the lifting machine body (1); and, A sling (11) is mounted on the hoist body (1), an inner ramming hammer (2) is mounted at the end of the sling (11), and an outer ramming hammer (3) is mounted outside the inner ramming hammer (2); wherein, The internal tamping hammer (2) is provided with a drainage component (21), including a conveying hole (211) disposed inside the internal tamping hammer (2) and a drainage hole (212) disposed inside the conveying hole (211); and, The external ramming hammer (3) has a pumping chamber (31) inside, a filter element (32) inside the pumping chamber (31), and a transmission element (33) outside the filter element (32); wherein, The filter element (32) includes an outer filter plate (321) disposed at the end of the outer hammer (3) and an inner filter plate (323) disposed inside the outer filter plate (321); wherein, The inner hammer (2) drives the inner filter plate (323) to move downward through the transmission component (33), so that the water in the ramming hole is filtered and pressured into the pumping chamber (31). The downward movement of the inner hammer (2) squeezes the internal space of the pumping chamber (31) so that the water is discharged from the drain hole (212) of the drain component (21). The transmission component (33) includes a transmission cylinder (331) disposed inside the outer hammer (3). A transmission interlayer (37) is provided inside the outer hammer (3). The transmission cylinder (331) moves vertically up and down inside the transmission interlayer (37). Multiple transmission sliders (333) are provided outside the inner hammer (2). A first slide groove (38) is provided outside the transmission interlayer (37). The transmission sliders (333) move vertically within the first slide groove (38). Multiple connecting sliders (334) are provided outside the inner filter plate (323). A transmission column (335) is provided at the end of the connecting slider (334). Multiple second slide grooves (39) are provided outside the transmission interlayer (37). The connecting sliders (334) move vertically along the second slide grooves (39). The transmission cylinder (331) has a connecting hole (338) on its outside. The transmission column (335) is inserted into the connecting hole (338). The connecting hole (338) has a telescopic hole (339) inside. The transmission cylinder (331) has multiple sliding pins (332) on its outside. The transmission interlayer (37) has multiple switching grooves (36) inside. The switching groove (36) is composed of two parallel intersecting vertical grooves and an arc groove connecting the two vertical grooves. The sliding pins (332) slide in the switching groove (36). The connecting hole (338) has a locking block (336) inside. The transmission column (335) has a locking groove (337) on its outside. The locking block (336) is inserted into the locking groove (337).

2. The dynamic compaction equipment for soft ground foundation construction according to claim 1, characterized in that: The drainage component (21) also includes a pipe joint (213) disposed outside the inner hammer (2). The pipe joint (213) is used to connect an external drainage pipe to transport water out of the hammer. The drainage hole (212) extends into the pipe joint (213). The outer hammer (3) is provided with an inner edge protrusion (311).

3. The dynamic compactor for construction of soft ground foundation according to claim 2, characterized in that: It also includes a water pumping component (34) disposed at the end of the inner filter plate (323), including a water pumping cover (341) disposed at the end of the inner filter plate (323), the water pumping cover (341) having multiple water pumping holes (342) on the outside, and a water delivery cylinder (343) disposed on the outside of the water pumping cover (341), the water delivery cylinder (343) extending and retracting vertically within the delivery hole (211).

4. The dynamic compactor for construction of soft ground foundation according to claim 3, characterized in that: The inner filter plate (323) has an annular inclined surface with a height decreasing towards the center. Multiple filter holes (324) are provided on the outside of the inner filter plate (323). A filter screen is provided inside the filter holes (324). Multiple filter grooves (322) are provided on the outside of the outer filter plate (321). Multiple sealing plugs (325) are provided at the end of the outer filter plate (321).

5. The dynamic compaction apparatus according to claim 4, wherein: It also includes a cleaning component (22), which includes a threaded groove (224) disposed on the outside of the inner tamping hammer (2), a water inlet groove (223) disposed inside the threaded groove (224), a threaded cap (221) being threadedly connected inside the threaded groove (224), a sealing cylinder (222) inserted into the water inlet groove (223) being disposed at the end of the threaded cap (221), and a plurality of connecting ears (23) being disposed on the outside of the inner tamping hammer (2), the connecting ears (23) being used to connect the sling (11).

6. The dynamic compaction apparatus according to claim 5, wherein: It also includes a one-way valve (35) disposed inside the water delivery cylinder (343), including a fixed ring (351) disposed inside the water delivery cylinder (343), a movable ring plate (353) disposed outside the fixed ring (351), an installation block (355) disposed inside the water delivery cylinder (343), a sealing column (354) disposed at the end of the installation block (355), the sealing column (354) being inserted into the movable ring plate (353), a lifting slide groove (357) being opened inside the water delivery cylinder (343), a spring (352) being disposed inside the lifting slide groove (357), and a water spray groove (356) being opened inside the lifting slide groove (357).

7. A method for construction of a soft soil foundation by dynamic compaction, characterized by: Includes the dynamic compaction equipment for soft soil foundation construction as described in claim 6, and the following steps: Step 1: Remove surface debris, level the site, estimate the ground deformation after compaction, adjust the elevation of the crane body (1) to the design requirements, and lay a sand and gravel cushion layer with a thickness of 1.0-2.0 meters to enhance the bearing capacity of the foundation; Step 2: Mark the positions of the first compaction points with lime or wooden stakes to ensure that the layout conforms to the design. Use a level to measure the site elevation and record the data for later comparison. Step 3: The lifting equipment enters the site, and the external tamping hammer (3) is aligned with the tamping point. Ensure that the external tamping hammer (3) is stable and the center is aligned. Measure the elevation of the hammer top before tamping, which will serve as the benchmark for recording the tamping depth. Step 4: The lifting equipment lifts the inner hammer (2) and the outer hammer (3) to the predetermined height, and then the control equipment releases the hook to let the hammer fall freely. After the outer hammer (3) falls and hits the tamping point, the inner hammer (2) hits the outer hammer (3) again to perform a second hammering on the tamping point. When the inner hammer (2) hits the tamping point for the second time, it works with the filter (32), the pump (34) and the drain (21) to suck the water in the tamping hole into the hammer and then discharge it from the strong compaction construction area. Then the inner hammer (2) and the outer hammer (3) are lifted to the predetermined height to perform the tamping again. Step 5: Use a bulldozer to fill the tamping pit to ensure the site is flat. Perform low-energy full compaction according to the design requirements to compact the loose surface soil, improve the uniformity of the foundation, and measure the elevation of the site after compaction to ensure it meets the design requirements. Step 6: Place the outer ram (3) on the ground using the lifting machine (1), and flush it by injecting water into the outer ram (3) using the cleaning device (22).

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