Foundation treatment device under large-particle-size block stone backfill geological condition

Abstract

The utility model discloses a foundation treatment device under a large-particle-size rock block backfill geological condition, relates to the technical field of nuclear power station engineering, and is used for solving the problem that a common rotary drilling rig is difficult to break through a large-particle-size rock block backfill layer during pile foundation construction. The device comprises a pile hole forming construction device and a press-grouting pile foundation construction device, an air compressor and an atomized lubricator of the pile hole forming construction device are connected and arranged on one side of a long spiral drilling machine, the atomized lubricator is connected with a drilling rod of the long spiral drilling machine through a high-pressure air pipe, a power head is installed at the upper end of the drilling rod, and a down-the-hole hammer is installed at the lower end of the drilling rod; the pressure grouting pile foundation construction device comprises a compaction rod arranged on one side of a drill rod of the long spiral drilling machine and a long spiral drill bit arranged at the bottom of the drill rod.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear power station engineering, and particularly relates to a foundation treatment device under geological conditions of large-size block stone backfill. Background Art

[0002] If the construction ground is primarily composed of uneven, poorly uniform, excavated rock, on-site pile foundation construction is highly unfavorable. Existing conventional pile foundation drilling technology is not suitable for geological conditions where hard rock and soft silt are combined, and cannot penetrate the large-grained rock backfill layer. In such uneven geological conditions, pile foundation construction is extremely difficult, and a reliable, convenient, efficient, and capable pile foundation construction device is needed to successfully penetrate the backfill layer. Utility Model Content

[0003] The purpose of this utility model is to provide a foundation treatment device for geological conditions with large-size rock backfill, solving the problem that ordinary rotary drilling rigs are difficult to penetrate the large-size rock backfill layer during pile foundation construction. While ensuring the quality of the operation, the device can efficiently and stably complete the pile hole drilling operation in the rock backfill layer below the surface.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a foundation treatment device under geological conditions of large-size block backfill, wherein the device includes a pile hole forming construction device and a pressure-grouted pile foundation construction device, the air compressor and the oil mist generator of the pile hole forming construction device are connected and arranged on one side of a long spiral drill, the oil mist generator is connected to the drill rod of the long spiral drill through a high-pressure air duct, the power head is installed at the upper end of the drill rod, and the down-the-hole hammer is installed at the lower end of the drill rod; the pressure-grouted pile foundation construction device includes a compaction rod arranged on one side of the drill rod of the long spiral drill and a long spiral drill bit at the bottom of the drill rod.

[0005] The above-mentioned foundation treatment device under large-size block backfill geological conditions, wherein the down-the-hole hammer structure includes: a hammer head, an impactor, and a pipe shoe. The hammer head is located at the bottom of the down-the-hole hammer and is connected to the impactor and the pipe shoe. The pipe shoe is arranged on the outside of the impactor.

[0006] Compared with the existing technology, the beneficial effects of the present invention are: the foundation treatment device provided by the present invention under large-size block stone backfill geological conditions can, under complex geological conditions, on the one hand, improve construction efficiency and save construction period by carrying out pile foundation construction through an optimized process combining a down-the-hole hammer with a long spiral drilling and grouting pile; on the other hand, by using an oil mist device to lubricate the down-the-hole hammer, the wear of the down-the-hole hammer can be reduced and the drilling efficiency can be increased; on the other hand, by using the secondary compaction technology of grouting piles after the down-the-hole hammer opens the hole, the collapse rate of the pile hole can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1The figure shows the construction principle diagram of an air down-the-hole hammer of a foundation treatment device under geological conditions of large-size block backfill according to the present invention;

[0008] Figure 2 The figure shows the structure of a pneumatic down-the-hole hammer drill bit of a ground treatment device for backfilling geological conditions with large-size rock blocks according to the present invention;

[0009] Figure 3 The figure shows a schematic diagram of the construction principle of a long spiral grouting pile of a foundation treatment device under geological conditions of large-size block backfill described in the utility model.

[0010] Explanation of the numbers in the accompanying drawings: 1. Air compressor; 2. Oil mist collector; 3. High-pressure air duct; 4. Power head; 5. Long spiral drill; 6. Drill rod; 7. Down-the-hole hammer; 8. Hammer head; 9. Impactor; 10. Pipe shoe; 11. Compacting rod; 12. Long spiral drill bit. DETAILED DESCRIPTION

[0011] In order to solve the problem that conventional rotary drilling rigs are difficult to break through the large-size block stone backfill layer during pile foundation construction, the utility model provides a foundation treatment device under geological conditions of large-size block stone backfill. Figure 1-Figure 3 As shown, the foundation treatment device includes a pile hole construction device and a pressure-grouted pile foundation construction device. The pile hole construction device includes: an air compressor 1, an oil mist generator 2, a high-pressure air duct 3, a power head 4, a drill rod 6 and a down-the-hole hammer 7. The pressure-grouted pile foundation construction device includes a long spiral drill 5, a drill rod 6, a compaction rod 11 and a long spiral drill bit 12.

[0012] The down-the-hole hammer 7 comprises a hammer head 8, a striker 9, and a pipe shoe 10. The hammer head 8 is located at the bottom of the down-the-hole hammer 7 and is connected to the striker 9 and the pipe shoe 10. The pipe shoe 10 is disposed outside the striker 9. The foundation treatment device uses the down-the-hole hammer 7 to complete the pile hole drilling operation in the riprap backfill layer below the surface, ensuring the hole quality and creating conditions for subsequent grouted pile foundation construction.

[0013] The down-the-hole hammer 7 is connected to the lower end of the drill rod 6 of the long spiral drill 5. After the long spiral drill 5 is in place, the down-the-hole hammer 7 is aligned with the hole position by controlling the long spiral drill 5. After the long spiral drill 5 is turned on, the down-the-hole hammer 7 is powered by compressed air. The compressed air is provided by the air compressor 1 and lubricated by the oil mist generated by the oil mist generator 2. It enters the impactor 9 through the high-pressure air duct 3 and the power head 4 to push the down-the-hole hammer 7 to work. The high-frequency reciprocating impact of the impactor 9 inside the down-the-hole hammer 7 on the hammer head 8 is used to effectively impact and crush the rock at the bottom of the hole. The crushed rock is discharged upward from the hole along the pipe shoe 10 with the air. This cycle is repeated until the bottom of the block rock filling layer is drilled into, and then the drill rod is lifted and the drilling rig is moved to the next pile position.

[0014] The principle of secondary compaction technology for grouted piles is as follows: After the down-the-hole hammer 7 has drilled a hole, the long auger rig 5 positions and centers the compaction rod 11. The rig is then started and drilled to the bottom of the rock fill layer. The long auger drill bit 12 penetrates the fill layer while compacting the soil with the compaction rod 11. The long auger drill rod 6 is then raised and the rig is moved to the next pile location. Finally, the long auger bored grouted pile is constructed: the rig is started and drilled to the designed elevation of the pile bottom. While the drill is raised, concrete is pumped to the designed elevation of the pile top. The rig is then moved, and the steel cage is positioned, centered, and vibrated to the designed elevation of the pile bottom. The vibrator is then raised to the pile hole mouth, completing the construction of that pile location. Since long spiral drilling and grouting pile machines are not easy to penetrate hard plastic clay, dense sand and gravel layers, they have obvious advantages when passing through silt layers and silty clay layers. Due to the different texture of its long screw, it can protect the wall while drilling, greatly reducing the risk of hole collapse. By combining with the down-the-hole hammer process, the long screw drilling rig can pass through the riprap backfill layer without obstacles and drill holes and piles smoothly, greatly improving the scope of application of the grouting pile construction process and solving the problem of low efficiency of pile foundation construction due to the complex riprap backfill stratum after filling.

[0015] It should be noted that the combination of the various technical features in the embodiments of the present invention is not limited to the combination described in the embodiments of the present invention or the combination described in the specific embodiments. All technical features described in the present invention can be freely combined or combined in any way unless there is a contradiction between them.

[0016] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, etc. 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 foundation treatment device for backfilling geological conditions with large-size blocks, characterized in that: The device comprises a pile hole forming construction device and a pressure-cast pile foundation construction device. The air compressor (1) and the oil mist device (2) of the pile hole forming construction device are connected and arranged on one side of a long spiral drill (5). The oil mist device (2) is connected to the drill rod (6) of the long spiral drill (5) through a high-pressure air pipe (3). The power head (4) is installed at the upper end of the drill rod (6), and the down-the-hole hammer (7) is installed at the lower end of the drill rod (6). The pressure-cast pile foundation construction device comprises a compacting rod (11) arranged on one side of the drill rod (6) of the long spiral drill (5) and a long spiral drill bit (12) at the bottom of the drill rod (6).

2. The ground treatment device for large-size rock backfilling under geological conditions according to claim 1, characterized in that: The structure of the down-the-hole hammer (7) comprises a hammer head (8), an impactor (9), and a pipe shoe (10). The hammer head (8) is located at the bottom of the down-the-hole hammer (7) and is connected to the impactor (9) and the pipe shoe (10). The pipe shoe (10) is arranged outside the impactor (9).

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