A preformed hole compaction device and compaction method thereof

Abstract

The invention discloses a tamping device for a preformed hole and a tamping method thereof. The device comprises a casing, a feeding device, a hydraulic transmission device and a tamping hammer. The casing is matched with the preformed hole. A hanging seat for hanging a lifting device is connected to the inner cavity of the casing near the upper end side. The feeding device is connected below the hanging seat. The feeding device comprises a hopper, a material distributor and a material guide pipe connected to the inner wall of the casing. The hopper is connected below the material distributor. The material distributor is arranged in a ring to connect several material guide pipes. The material guide pipe is welded to the inner wall of the casing. The lower end of the material guide pipe is located above the lower end of the casing. A mounting seat is arranged below the material distributor. The mounting seat is connected to the upper end of a hydraulic cylinder of the hydraulic transmission device. A piston rod of the hydraulic cylinder is connected to a tamping hammer which reciprocates up and down along the material guide pipe. A slide groove matching the slide rail at the lower end of the material guide pipe is arranged on the side wall of the tamping hammer. A magnetostrictive displacement sensor is built in the single-acting hydraulic cylinder. The magnetostrictive displacement sensor is connected to a controller. The controller is connected to a buzzer.

Description

Technical Field

[0001] The invention belongs to the field of strong compaction construction equipment, and in particular relates to a compaction device in a preformed hole and a compaction method thereof. Background Art

[0002] The dynamic compaction method is a method of using a dynamic compaction machine to lift a rammer of a certain weight to a certain height and then release it, so that the rammer falls freely to compact the foundation. The dynamic compaction method has been widely used in my country due to its wide range of applications and low cost. However, its disadvantages are high noise and vibration during construction, differences between the effective area and the affected area during tamping, and limited reinforcement depth. For foundations with deep soft underlying layers, only increasing the lifting capacity and lifting height of the dynamic compaction machine can be effective. Due to the above reasons, the promotion and use of the dynamic compaction method is limited in deep foundation treatment projects.

[0003] Deep compaction in the hole is to use a compaction hammer to enter the deep layer of the foundation through the hole to dynamically consolidate the pile body and forcefully compact the soil between the piles. At present, most of the compaction in the hole is achieved by an automatic unhooking device, but it is difficult to hook the hammer when the automatic hook is used in the hole construction. There are also a few compaction machines on the market that use free fall winches. The hammer does not unhook during free fall operation, and the winch reverses accordingly. However, the purchase cost and use and maintenance cost of the free fall winch are high, and the free fall compaction also has high requirements on the strength of the compaction equipment's own structure. The strong vibration during the operation process will cause the risk of hole collapse; the rammer needs to be lifted out of the ramming hole when filling; the work efficiency is low; the compaction machine constantly switches between load and no-load during the operation, and the rammer is easy to deviate from the hole position, which places high requirements on the equipment.

[0004] The hydraulic impact hammer relies on the hydraulic cylinder to achieve rapid up and down reciprocating motion, and quickly compacts different positions under the traction of a loader or other working device. However, it can only compact the surface and above, and cannot be used for in-hole or deep tamping. At the same time, due to the tamping plate, buffer device, etc. provided at the bottom of its mechanism, the energy of the tamping hammer cannot be fully applied to the treated foundation, resulting in a large energy loss. Summary of the invention

[0005] The purpose of the present invention is to provide a preformed hole compaction device and compaction method thereof, which can quickly and effectively reinforce deep foundations.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The ramming device of a preformed hole comprises a casing, a feeding device, a hydraulic transmission device and a rammer. The casing matches the preformed hole, and a hanging seat for hanging a lifting equipment is connected near the upper end side of the inner cavity of the casing, and the feeding device is connected below the hanging seat. The feeding device comprises a hopper, a material distributor and a material guide pipe connected to the inner wall of the casing, and the material distributor is connected below the hopper. The material distributor is arranged in a ring to connect several material guide pipes, the material guide pipe is welded to the inner wall of the casing, the lower end of the material guide pipe is located above the lower end of the casing, a mounting seat is arranged below the material distributor, the mounting seat is connected to the upper end of the hydraulic cylinder of the hydraulic transmission device, the piston rod of the hydraulic cylinder is connected to a rammer that reciprocates up and down along the material guide pipe, the rammer is in direct contact with the compacted soil base, and a slide groove matching the slide rail at the lower end of the material guide pipe is arranged on the side wall of the rammer, a magnetostrictive displacement sensor is built in the hydraulic cylinder, the magnetostrictive displacement sensor is connected to a controller, and the controller is connected to a buzzer.

[0008] Preferably, the hydraulic cylinder is a single-acting hydraulic cylinder.

[0009] Preferably, the material guide pipe comprises an inclined pipe and a vertical pipe, the inclined pipe is inclined downward from the bottom of the material distributor toward the inner wall of the casing, and the vertical pipe is welded to the inner wall of the casing.

[0010] Specifically, the chamber of the single-acting hydraulic cylinder is connected to the oil tank of the crane, the liquid inlet of the electromagnetic reversing valve and the liquid inlet of the logic valve respectively, the oil outlet of the electromagnetic reversing valve is connected to the control port of the logic valve, the oil outlet of the logic valve is connected to the oil tank of the crane, and the electromagnetic reversing valve is connected to the controller.

[0011] Preferably, the mounting seat is welded to the inner wall of the casing through a bearing ring, and the mounting seat is two spaced plates, which are connected to the upper end of the single-acting hydraulic cylinder through a pin shaft.

[0012] The weight of the rammer is 0.2-30 tons.

[0013] A compaction method using any of the above-mentioned preformed hole compaction devices, comprising the following steps:

[0014] ①. Construction preparation;

[0015] ②. Measurement and layout of construction site;

[0016] ③. Pre-hole forming;

[0017] ④. Use a crane to lower the compaction device into the pre-formed hole and adjust its position so that it is located in the center of the pre-formed hole and at the designed depth.

[0018] ⑤. After the compaction device is adjusted and positioned, the hydraulic cylinder will lift the rammer to the set height;

[0019] ⑥. The filler is transported from the feeding device to the hopper of the feeding device; the filler is transported to the bottom of the hole along the guide pipe through the distributor under the hopper. After the filling is completed, the hydraulic cylinder quickly drains oil through the logic valve, and the rammer directly rams the filler by free fall; the low-drop and high-frequency tamping method is used for rapid tamping, and the superposition of the shock wave formed by the impact of the rammer and adjacent hammering can achieve a better tamping effect. The cylinder stroke is measured by the built-in magnetostrictive displacement sensor, and the controller automatically calculates the difference between two adjacent blows to determine the tamping amount. When the requirements are met, the buzzer prompts, and the crane lifts the tamping device to the corresponding height until the pre-hole forming operation of the hole is completed.

[0020] Preferably, the drop distance is 0.1-3m and the high frequency is 80-120 times / minute.

[0021] The beneficial effects of the present invention are as follows: the compaction device of the present invention has a simple and reliable structure, can significantly improve the construction efficiency, has the protection of a casing, can effectively avoid hole collapse during operation, and is convenient for maintenance; the construction method is suitable for the construction of deep foundation treatment projects, can quickly achieve deep reinforcement treatment of soft foundations, quickly eliminate the collapsibility of deep foundations, greatly improve the bearing capacity of the foundation, reduce the compressibility of the foundation, and the foundation treatment effect is significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiment of the present invention, the embodiment will be described below with reference to the accompanying drawings.

[0023] Figure 1 The working state structure diagram of the compaction device of the present invention is shown in FIG. Figure 1 .

[0024] Figure 2 The working state structure diagram of the compaction device of the present invention is shown in FIG. Figure 2

[0025] Figure 3 The structure of the compaction device of the present invention is schematically shown in FIG. Figure 1 .

[0026] Figure 4 The structure of the compaction device of the present invention is schematically shown in FIG. Figure 2 .

[0027] Figure 5 This is a schematic diagram of the structure of the compaction device of the present invention without the oil cylinder and the rammer. Figure 1 .

[0028] Figure 6 This is a schematic diagram of the structure of the compaction device of the present invention without the oil cylinder and the rammer. Figure 2 .

[0029] Figure 7 It is a schematic diagram of the main structure of the rammer of the present invention.

[0030] Figure 8 It is a schematic diagram of the top view of the structure of the rammer of the present invention.

[0031] Fig. 9 is a block diagram of the compaction method of the present invention.

[0032] 1: casing, 11: hanging seat, 12: hanging shaft, 2: feeding device, 21: hopper, 22: distributor, 23: guide pipe, 231: inclined pipe, 232: vertical pipe, 3: single-acting hydraulic cylinder, 4: rammer, 41: slideway, 5: mounting seat. DETAILED DESCRIPTION

[0033] The following examples are merely used to illustrate possible implementations of the present invention, but are not intended to limit the scope of the present invention, so it is necessary to explain them first.

[0034] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention.

[0035] like Figures 1 to 8As shown, it is a preferred embodiment of the present invention, a tamping device in a preformed hole, comprising a casing 1, a feeding device 2, a hydraulic transmission device and a rammer 4, the casing 1 matches the preformed hole, the casing 1 is a prototype or a polygon, a hanging seat 11 is connected to the inner cavity of the casing 1 near the upper end side, a hanging shaft 12 for hanging a lifting device is installed on the hanging seat, the feeding device 2 is connected below the hanging seat 11, the feeding device 2 comprises a hopper 21, a distributor 22 and a guide pipe 23 welded to the inner wall of the casing, the lower outlet of the hopper 21 is connected to the upper inlet of the distributor 22, the bottom plate of the distributor 22 is annularly arranged to connect several guide pipes 23, the guide pipe 23 comprises an inclined pipe 231 and a vertical pipe 232, the inclined pipe 231 of the guide pipe 23 is inclined downward from the distributor toward the inner wall of the casing 1, the inclined The lower end of the tube 231 is connected to the upper end of the vertical tube 232, and the vertical tube 232 is close to the inner wall of the casing. The lower end of the vertical tube 232 is located inside the casing 1. A load-bearing ring is welded to the inner wall of the casing below the distributor 22, and the mounting seat 5 is connected to the load-bearing ring. The mounting seat is two spaced plates, and the two plates are connected to the upper end of the single-acting hydraulic cylinder through a pin. The piston rod of the single-acting hydraulic cylinder 3 is connected to a rammer 4 that reciprocates up and down along the vertical tube of the guide tube. The rammer 4 directly acts on the compacted soil base, with small energy loss and good compaction effect. A slide groove 41 matching the slide rail at the lower end of the guide tube 23 is provided on the side wall of the rammer 4. A magnetostrictive displacement sensor is built into the single-acting hydraulic cylinder 3, and the magnetostrictive displacement sensor is connected to a controller, and the controller is connected to a buzzer. The lower chamber of the single-acting hydraulic cylinder is connected to the oil tank of the crane, the liquid inlet of the electromagnetic reversing valve and the liquid inlet of the logic valve respectively, the oil outlet of the electromagnetic reversing valve is connected to the control port of the logic valve, the oil outlet of the logic valve is connected to the oil tank of the crane, the electromagnetic reversing valve is connected to the controller, the single-acting hydraulic cylinder is supplied with oil by the crane, when the oil is drained, the pressure oil in the lower chamber flows into the control port of the logic valve through the electromagnetic reversing valve, the oil inlet of the logic valve is opened, and the oil flows back to the crane oil tank through the oil outlet of the logic valve. The weight of the rammer 4 is 0.2-30 tons.

[0036] like Fig. 9 As shown, the compaction method implemented by using the above-mentioned preformed hole compaction device is described, and the steps are as follows:

[0037] ①. Construction preparation;

[0038] ②. On-site measurement and layout of the construction site according to design requirements;

[0039] ③ Pre-hole forming, i.e., the hole is formed by positioning the rotary drilling rig or other equipment;

[0040] ④. Use a crane to lower the compaction device into the pre-formed hole and adjust its position so that it is located in the center of the pre-formed hole and at the designed depth.

[0041] ⑤. After the compaction device is adjusted and positioned, the single-acting hydraulic cylinder will lift the rammer to the set height;

[0042] ⑥. Filling compaction: The material is transported from the feeding device to the hopper of the feeding device; the filling can be continuous or layered, or the filling can be assisted by auxiliary equipment. The material is transported to the bottom of the hole along the guide pipe through the distributor under the hopper. After the filling is completed, the single-acting hydraulic cylinder quickly drains oil through the logic valve, and the rammer falls directly to tamp the filler by free fall; the repeated low-drop high-frequency tamping method is used for rapid tamping, and the superposition of the shock wave formed by the impact of the heavy hammer and the adjacent hammering can achieve a better tamping effect. The low drop distance is 0.1-3m, and the high frequency is 80-120 times / minute. The cylinder stroke is measured by the built-in magnetostrictive displacement sensor, and the controller automatically calculates the difference between two adjacent hits to determine the tamping amount. When the requirements are met, the buzzer prompts, and the crane lifts the tamping device to the corresponding height until the hole operation is completed;

[0043] ⑦ After completion, the tamping device will be moved to the next pre-formed hole by the crane for tamping operation.;

[0044] ⑧The site is flat.

[0045] The present invention can adjust the lifting height and weight of the rammer to carry out low-drop and high-frequency compaction reinforcement treatment according to different soil types and density requirements. The superposition effect of the impact of the heavy hammer and the shock waves formed by adjacent hammer strikes can achieve a rapid compaction effect. Filling can be done simultaneously during the compaction process without taking the device out of the hole and then filling it, which significantly improves construction efficiency.

Claims

1. A compaction device for a preformed hole, characterized in that: The invention comprises a casing, a feeding device, a hydraulic transmission device and a rammer, wherein the casing is matched with the preformed hole, and a hanging seat for hanging a lifting equipment is connected to the inner cavity of the casing near the upper end side, and the feeding device is connected below the hanging seat, and the feeding device comprises a hopper, a material distributor and a material guide pipe connected to the inner wall of the casing, the material distributor is connected below the hopper, the material distributor is arranged in a ring to connect several material guide pipes, the material guide pipe is welded to the inner wall of the casing, the lower end of the material guide pipe is located above the lower end of the casing, a mounting seat is arranged below the material distributor, the mounting seat is connected to the upper end of the hydraulic cylinder of the hydraulic transmission device, the piston rod of the hydraulic cylinder is connected to a rammer that reciprocates up and down along the material guide pipe, the rammer is in direct contact with the compacted soil base, and a slide groove matching the slide rail at the lower end of the material guide pipe is arranged on the side wall of the rammer, the hydraulic cylinder is equipped with a magnetostrictive displacement sensor, the magnetostrictive displacement sensor is connected to a controller, and the controller is connected to a buzzer.

2. A preformed hole compaction device according to claim 1, characterized in that: The hydraulic cylinder is a single-acting hydraulic cylinder.

3. A preformed hole compaction device according to claim 1 or 2, characterized in that: The material guide pipe comprises an inclined pipe and a vertical pipe. The inclined pipe is inclined downward from the bottom of the material distributor toward the inner wall of the casing, and the vertical pipe is welded to the inner wall of the casing.

4. A preformed hole compaction device according to claim 2, characterized in that: The cavity of the single-acting hydraulic cylinder is connected to the oil tank of the crane, the liquid inlet of the electromagnetic reversing valve and the liquid inlet of the logic valve respectively, the oil outlet of the electromagnetic reversing valve is connected to the control port of the logic valve, the oil outlet of the logic valve is connected to the oil tank of the crane, and the electromagnetic reversing valve is connected to the controller.

5. The preformed hole compaction device according to claim 1, characterized in that: The mounting seat is welded on the inner wall of the casing through a bearing ring. The mounting seat is composed of two spaced plates, which are connected to the upper end of the single-acting hydraulic cylinder through a pin shaft.

6. A preformed hole compaction device according to claim 1, characterized in that: The weight of the rammer is 0.2-30 tons.

7. A compaction method using the preformed hole compaction device according to any one of claims 1 to 6, characterized in that: Here are the steps: , construction preparation; 3. Measurement and layout of construction sites; , pre-hole forming; 1. Use a crane to lower the compaction device into the pre-formed hole and adjust its position so that it is located at the center of the pre-formed hole and at the designed depth; 2. After the compaction device is adjusted and positioned, the hydraulic cylinder will lift the rammer to the set height; 1. Transport the filler from the feeding device to the hopper of the feeding device; transport the filler along the guide pipe to the bottom of the hole through the distributor under the hopper. After the filling is completed, the hydraulic cylinder quickly drains oil through the logic valve, and the rammer directly tamps the filler by free fall; adopt the low-drop and high-frequency tamping method for rapid tamping, and achieve better tamping effect through the superposition of the shock wave formed by the impact of the rammer and adjacent hammer strikes. The cylinder stroke is measured by the built-in magnetostrictive displacement sensor, and the controller automatically calculates the difference between two adjacent strikes to determine the tamping amount. When the requirements are met, the buzzer prompts, and the crane lifts the tamping device to the corresponding height until the pre-hole operation is completed.

8. The compaction method according to claim 7, characterized in that: The drop distance is 0.1-3m, and the high frequency is 80-120 times / minute.

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