Full-steel follow-up casing rotary drilling construction structure in high backfill area

Abstract

The application discloses a high backfill area full-steel follow-up casing rotary drilling construction structure, which comprises a steel casing inserted and pressed into a backfill layer and a bedrock layer during construction; and a limiting top rod B and a limiting top rod A in contact with the steel casing to provide guidance. When the steel casing is pressed by force, the two limiting top rods B and the two limiting top rods A at different heights are in contact with the steel casing to limit and guide the steel casing, so that displacement deviation of the steel casing during the pressing process is avoided, and subsequent drill rods continue to complete rotary drilling of the high backfill area of the backfill layer, thereby solving the problem that the steel casing is not limited and guided during the pressing process and is prone to displacement deviation.

Description

Technical Field

[0001] This utility model relates to a rotary drilling construction structure with all-steel follow-up casing in high backfill areas, belonging to the field of pile hole construction technology. Background Technology

[0002] The load-bearing pile foundation of the building needs to be embedded in the bedrock layer to bear the load. For high backfill areas formed by backfilling with soil and rock, in order to avoid the collapse of the backfill layer during rotary drilling, all-steel follow-up casings must be used for support.

[0003] The prior art can be found in Chinese Patent Publication No. CN112554176A. Although the steel casing can be rotated and pressed down by a cross-shaped pipe screwdriver, there is no limiting guide during the pressing process of the steel casing, which can easily lead to displacement and deviation. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a rotary drilling construction structure for all-steel follow-up casing in high backfill areas.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a rotary drilling construction structure for all-steel follow-up casing in high backfill areas, comprising: During construction, steel casings are inserted and pressed into the backfill layer and bedrock layer; Limiting rods B and A provide guidance for contacting and limiting the steel casing.

[0007] The steel casing contains an optional drill rod, and the bottom of the drill rod has a drill bit for rotary drilling of the backfill layer and bedrock layer.

[0008] It also includes a load-bearing plate placed in contact with the top of the backfill layer; the load-bearing plate is covered with four square steel bars, with the left and right square steel bars horizontally spaced apart from each other, and the front and back square steel bars horizontally spaced apart from each other, and the left and right square steel bars perpendicular to the front and back square steel bars.

[0009] The square steel bars distributed on the left and right are provided with cable holes at both ends, and lifting cables are tied and fixedly connected in the cable holes.

[0010] Each of the square steels, which are spaced apart on the left and right, is fixed with a threaded sleeve A. The threaded sleeve A is connected to a limit rod A by a threaded pair. Each of the square steels distributed at intervals is fixed with a threaded sleeve B, and the threaded sleeve B is connected to a limit rod B by a threaded pair. The limiting rod B is lower than the limiting rod A, causing the two limiting rods B and the two limiting rods A to be misaligned and layered when they contact and restrict the steel casing.

[0011] Both the limiting rod B and the limiting rod A, which are far from the steel casing, are fixed with upward-curving scrapers at their ends. The width of the scrapers is greater than the diameter of the limiting rod B and the limiting rod A.

[0012] The beneficial effects of this utility model are as follows: when the steel casing is pressed down, the two limiting rods B and the two limiting rods A at different heights contact the steel casing to restrict and guide it, avoiding displacement and deviation during the pressing down of the steel casing. The subsequent drill rods continue to complete rotary drilling of the high backfill area of ​​the backfill layer, solving the problem of displacement and deviation during the pressing down of the steel casing without restriction and guidance. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of the present invention from the left front view; Figure 2 This is a schematic diagram showing the distribution of the limiting rod A, the limiting rod B, and the steel casing of this utility model; In the diagram: 1-Resistant plate; 11-Backfill layer; 12-Bedrock layer; 13-Drill rod; 2-Square steel; 21-Cable hole; 22-Hanging cable; 3-Threaded sleeve A; 31-Limiting rod A; 4-Threaded sleeve B; 41-Limiting rod B; 5-Steel casing; 6-Scraper. Detailed Implementation

[0014] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0015] like Figures 1 to 2 As shown.

[0016] This application discloses a rotary drilling construction structure for high backfill areas using all-steel follow-up casing, comprising: The load-bearing plate 1 is in contact with the top of the backfill layer 11. Below the backfill layer 11 is the bedrock layer 12. The drill rod 13 will eventually drill into the bedrock layer 12 to form a pile hole. The pile foundation formed by the later pouring of concrete is embedded in the bedrock layer 12 to bear the load on the building.

[0017] Four square steel bars 2 are placed on the load-bearing plate 1. The square steel bars 2 are arranged horizontally and spaced apart from each other on the left and right sides, and horizontally spaced apart from each other on the front and back sides. The square steel bars 2 arranged on the left and right sides are perpendicular to the square steel bars 2 arranged on the front and back sides. Each of the square steel bars 2 arranged on the left and right sides has a cable hole 21 at both ends. A lifting cable 22 is fixedly connected to each of the cable holes 21. The four lifting cables 22 can be used to lift and move the load-bearing plate 1.

[0018] Each of the square steels 2, which are spaced apart on the left and right, is welded and fixed with a threaded sleeve A3. The threaded sleeve A3 is connected to a limit rod A31 by a threaded pair. The limit rod A31 is provided with an external thread that engages with the internal thread through hole provided by the threaded sleeve A3.

[0019] Threaded sleeves B4 are welded and fixed to the square steel 2 distributed at intervals. The threaded sleeves B4 are connected to the limiting rods B41 through the threaded pair. The limiting rods B41 have external threads that engage with the internal threaded through holes of the threaded sleeves B4. The limiting rods B41 are lower than the limiting rods A31, so that when the two limiting rods B41 and the two limiting rods A31 contact and restrict the steel casing 5, they are staggered and layered, which improves the limiting and guiding performance of the steel casing 5.

[0020] The drill bit at the bottom of the drill rod 13 is used to rotary drill holes into the backfill layer 11 and the bedrock layer 12.

[0021] When the drill rod 13 is rotated downwards and the steel casing 5 is pressed down for support, the two limiting rods B41 and two limiting rods A31 at different heights contact the steel casing 5 to restrict and guide it, thus preventing displacement and deviation that may easily occur when the steel casing 5 is pressed down into the backfill layer 11 and the bedrock layer 12. The subsequent drill rod 13 continues to complete the rotary drilling of the high backfill area of ​​the backfill layer 11, thus solving the problem of displacement and deviation that may easily occur during the pressing down of the steel casing without restrictive guidance.

[0022] Both the limiting rods B41 and A31, located away from the steel casing 5, have upward-curving scrapers 6 welded and fixed to their ends. The width of the scrapers 6 is greater than the diameter of the limiting rods B41 and A31, making it easier to grip the scrapers 6 and apply rotational force to the limiting rods B41 and A31. When there is a layer of soil outside the steel casing 5, the limiting rods B41 and A31 are unscrewed from the threaded sleeves B4 and A3, and then the scrapers 6 are operated while gripping the limiting rods A3 or B41 to clean the soil outside the steel casing 5, ensuring that there is no soil layer at the contact point between the limiting rods A3 and B41 and the steel casing 5.

Claims

1. A rotary drilling construction structure for all-steel follow-up casing in high backfill areas, characterized in that, include: During construction, steel casings (5) are inserted and pressed into the backfill layer (11) and bedrock layer (12); Limiting rod B (41) and limiting rod A (31) that contact the steel casing (5) to provide guidance; It also includes a stress plate (1) placed in contact with the top of the backfill layer (11); square steel (2) is placed on the stress plate (1), there are four square steel (2), the square steel (2) distributed on the left and right are horizontally spaced apart from each other, the square steel (2) distributed in front and back are horizontally spaced apart from each other, and the square steel (2) distributed on the left and right is perpendicular to the square steel (2) distributed in front and back. Each of the square steels (2) spaced apart on the left and right sides is fixed with a threaded sleeve A (3), and the threaded sleeve A (3) is connected to the limit rod A (31) by the threaded pair. Each of the square steels (2) spaced at the front and back is fixed with a threaded sleeve B (4), and the threaded sleeve B (4) is connected to a limit rod B (41) by a threaded pair. The limiting rod B (41) is lower than the limiting rod A (31), so that when the two limiting rods B (41) and the two limiting rods A (31) contact the steel casing (5) to restrict and guide the misalignment and layering.

2. The rotary drilling construction structure for high backfill areas with all-steel follow-up casing as described in claim 1, characterized in that: The steel casing (5) contains an optional drill rod (13), and the bottom of the drill rod (13) has a drill bit for rotary drilling of the backfill layer (11) and the bedrock layer (12).

3. The rotary drilling construction structure for high backfill areas with all-steel follow-up casing as described in claim 1, characterized in that: The square steel (2) distributed on the left and right sides is provided with cable holes (21) at both ends, and a lifting cable (22) is tied and fixed in the cable hole (21).

4. The rotary drilling construction structure for high backfill areas with all-steel follow-up casing as described in claim 1, characterized in that: Both the limiting rod B (41) and the limiting rod A (31) located away from the steel casing (5) are fixed with upward-curving scrapers (6).

5. The rotary drilling construction structure for high backfill areas with all-steel follow-up casing as described in claim 4, characterized in that: The width of the scraper (6) is greater than the diameter of the limiting rod B (41) and the limiting rod A (31).

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