Cast-in-place screw pile construction drilling tool

Abstract

The utility model discloses a cast-in-place screw pile construction drilling tool which comprises a hollow drilling rod, the bottom of the hollow drilling rod is sleeved with a replaceable spiral section assembled with the hollow drilling rod, the top of the hollow drilling rod is sleeved with a replaceable straight rod section assembled with the hollow drilling rod, and the outer diameter of the replaceable spiral section is equal to that of the replaceable straight rod section; the diameter sizes of the replaceable spiral sections and the replaceable straight rod sections are correspondingly arranged from small to large, and the spiral parameters of all the replaceable spiral sections are different. Compared with the prior art, the drilling tool has the advantages that the universality of the drilling tool for single-screw pile construction is improved, the construction requirements under various geological soil layer conditions can be met, the production cost is reduced, the construction progress is accelerated, and the practicability is better.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction engineering, and in particular relates to a cast-in-place screw pile construction drilling tool. Background Art

[0002] As a new type of rigid pile, screw pile consists of a straight rod section and a threaded section. In recent years, it has been gradually applied to engineering construction and has been widely promoted. Screw pile has the characteristics of high single pile bearing capacity and low cost. Its bearing capacity is mainly composed of three parts, namely the pile side friction resistance of the straight rod section, the shear effect of the threaded section and the pile end bearing capacity.

[0003] At present, the parameter sizes of the threaded section and straight rod section of the screw pile construction drill are fixed, and cannot be flexibly changed according to the current construction ground soil, stratum soil quality and on-site process. For example, when the screw pile is used in a miscellaneous fill layer containing crushed gravel or a hard plastic clay layer, it is necessary to reduce the pitch of the threaded section to speed up drilling; for another example, when the screw pile is used in a soft fill layer, it is necessary to reduce the pile spacing, increase the pile diameter and improve the bearing capacity. However, the above adjustments cannot be achieved simultaneously on a screw pile construction drill. It is necessary to separately produce multiple screw pile drills that meet the requirements to complete the construction, which increases production costs and slows down the construction progress. Utility Model Content

[0004] The utility model aims to provide a cast-in-place screw pile construction drill tool to improve the versatility of the single screw pile construction drill tool, reduce production costs and speed up construction efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A cast-in-place screw pile construction drilling tool comprises a hollow drill rod, wherein a replaceable spiral section assembled with the hollow drill rod is sleeved at the bottom of the hollow drill rod, and a replaceable straight rod section assembled with the hollow drill rod is sleeved at the top of the hollow drill rod, wherein the outer diameters of the replaceable spiral section and the replaceable straight rod section are equal; a plurality of groups of replaceable spiral sections and replaceable straight rod sections are respectively arranged in correspondence with each other in diameter sizes from small to large, and the spiral parameters of each group of replaceable spiral sections are different.

[0007] Compared with the prior art, the drill tool of the utility model improves the versatility of the single screw pile construction drill tool, can meet the construction needs under various geological soil conditions, reduces the production cost, speeds up the construction progress, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0009] Figure 2 for Figure 1 A magnified view of the structure in the middle.

[0010] Figure 3 for Figure 1 Enlarged view of the structure at point B in the middle.

[0011] Figure 4 for Figure 1 Enlarged view of the structure at point C in the middle.

[0012] Figure 5 for Figure 4 Schematic diagram of the circumferential arrangement of middle arc clips.

[0013] Figure 6 for Figure 5 Enlarged view of the structure at point D in the middle.

[0014] In the figure: 1-hollow drill rod, 2-replaceable spiral section, 3-replaceable straight rod section, 4-mounting slot, 5-clamping protrusion, 6-main clamp, 7-threaded hole, 8-first bolt member, 9-second bolt member, 10-connecting angle member, 11-hinge mechanism, 12-arc clamp, 13-resistance groove, 14-built-in limit cavity, 15-movable clamp ball, 16-telescopic rod, 17-drill bit, 18-grouting hole. DETAILED DESCRIPTION

[0015] The utility model is further explained below in conjunction with the accompanying drawings.

[0016] like Figure 1 As shown, the utility model cast-in-place screw pile construction drilling tool includes a hollow drill rod 1, the bottom of the hollow drill rod 1 is sleeved with a replaceable spiral segment 2 assembled with the hollow drill rod 1, the top of the hollow drill rod 1 is sleeved with a replaceable straight rod segment 3 assembled with the hollow drill rod 1, the outer diameter of the replaceable spiral segment 2 is equal to the replaceable straight rod segment 3; the diameter sizes of the replaceable spiral segment 2 and the replaceable straight rod segment 3 are respectively arranged in multiple groups from small to large, and the spiral parameters of each group of replaceable spiral segments 2 are different, and the spiral parameters here specifically refer to the pitch.

[0017] For the connection method of the replaceable straight rod section 3, such as Figure 1 and 2 As shown. The inner wall of each group of replaceable straight rod segments 3 is provided with a mounting slot 4, and the outer wall is fixedly provided with a snap-on protrusion 5. Multiple groups of main clamps 6 are fixedly provided on the outer wall of the hollow drill rod 1. The inner wall of the first group of replaceable straight rod segments 3 is assembled with the main clamps 6 on the outside of the hollow drill rod 1 through the mounting slot 4, and the remaining multiple groups of replaceable straight rod segments 3 are mutually plugged and assembled through the mounting slot 4 and the snap-on protrusion 5. At the same time, in order to improve the connection reliability, threaded holes 7 are correspondingly provided on the same side of the outer wall of the multiple groups of replaceable straight rod segments 3 and the hollow drill rod 1, and a first bolt member 8 adapted thereto is installed inside the threaded hole 7. The first bolt member 8 fixes the replaceable straight rod segment 3 and the hollow drill rod 1 together by cooperating with the threaded hole 7.

[0018] For the connection of the replaceable spiral segment 2, such as Figure 1 and 3 As shown. The outer surface of the lower side wall of the hollow drill rod 1 is provided with a plurality of connecting angled pieces 10. The connecting angled pieces 10 are L-shaped and tilt upward to form an angled structure, which can increase the anti-rotation resistance of the hollow drill rod 1 and ensure the overall pile stability of the hollow drill rod 1. A through hole is provided through the angled section of the connecting angled piece 10 itself, and a second bolt member 9 penetrating the replaceable spiral segment 2 is installed in the through hole. The replaceable spiral segment 2 is fixed by the cooperation of the second bolt member 9 and the connecting angled piece 10. Since the fixation is achieved by the cooperation of a plurality of second bolt members, the replaceable spiral segment 2 is limited by its own spiral and fixed by the second bolt member, and will not shake in the length direction. If you are worried, you can also add a nut (nut) on both the front and back sides of the spiral blade of the replaceable spiral segment 2 to ensure the connection stability.

[0019] In addition, for the installation of replaceable spiral segments 2 with the same pitch and different diameters, the installation method is the same as that of the previous replaceable spiral segment 2, and the position of the connecting angle piece 10 does not need to be changed, and the corresponding installation can be performed. For the installation of replaceable spiral segments 2 with different pitches and the same diameter, the position of the connecting angle piece 10 may need to be changed at this time. After cutting off the connecting angle piece that interferes with the replaceable spiral segment with a grinding wheel or a gas torch, it can be fixed with the remaining connecting angle pieces 10.

[0020] At the same time, in order to reduce the reverse rotation speed of the drill rod and cooperate with grouting, the stability of pile formation can be further improved to prevent the occurrence of quality problems such as hole collapse, broken piles, and diameter reduction. Figure 4-6 As shown, the outer surface of the lower side wall of the hollow drill rod 1 is also connected to an arc-shaped clamp 12 through a hinge mechanism (pivot, hinge, etc.) 11. Multiple groups of arc-shaped clamps 12 are spirally arranged along the outer circumference of the hollow drill rod 1. A resistance groove 13 that can increase the self-reverse rotation resistance of the hollow drill rod 1 is opened on the other side of the arc-shaped clamp 12. The resistance groove 13 is a triangular hollow groove body. A built-in limit cavity 14 is opened at the outer wall of the hollow drill rod 1 corresponding to the position on the other side of the arc-shaped clamp 12. The built-in limit cavity 14 is installed with a movable clamping ball 15. A telescopic rod 16 is fixed on the movable clamping ball 15, and the other end of the telescopic rod 16 is hinged to the arc-shaped clamp 12. During processing, a hole that can accommodate the movable card ball 15 can be first processed on the side wall surface of the hollow drill rod 1. After the movable card ball 15 is installed, a limit plate made of the same material as the hollow drill rod 1 is welded or screwed on the surface of the hole. A through hole is opened on the limit plate to accommodate the passage of the telescopic rod 16. The diameter of the through hole can allow the telescopic rod 16 to move freely without allowing the movable card ball 15 to fall out.

[0021] A drill bit 17 is also fixed at the bottom of the hollow drill rod 1, and a plurality of grouting holes 18 are opened on the drill bit for pumping concrete to form a pile body during the drilling rod lifting process.

[0022] The working process of the utility model is as follows: when in use, the hollow drill rod 1 is connected to the drilling rig, and the drilling rig is used to drive the spiral hollow drill rod 1 to rotate and squeeze the soil to form a hole. After the hole is formed, during the reverse lifting process of the hollow drill rod 1, concrete is pumped into the pile hole through the grouting hole 18 to form a pile body. Due to the presence of the connecting angle piece 10 and the arc-shaped clamping piece 12, the reverse rotation resistance of the hollow drill rod 1 in the slurry environment is improved, which can avoid the sudden jump of the hollow drill rod, effectively prevent the occurrence of quality problems such as hole collapse, broken piles, and reduced diameter, and ensure the quality of pile formation.

Claims

1. A cast-in-place screw pile construction drill, characterized in that: The invention comprises a hollow drill rod (1), wherein a replaceable spiral section (2) assembled with the hollow drill rod (1) is sleeved at the bottom of the hollow drill rod (1), and a replaceable straight rod section (3) assembled with the hollow drill rod (1) is sleeved at the top of the hollow drill rod (1), wherein the outer diameters of the replaceable spiral section (2) and the replaceable straight rod section (3) are equal; and the diameters of the replaceable spiral section (2) and the replaceable straight rod section (3) are arranged in a plurality of groups from small to large, and the spiral parameters of each group of replaceable spiral sections (2) are different.

2. A cast-in-place screw pile construction drilling tool as claimed in claim 1, characterized in that: The inner wall of each group of replaceable straight rod sections (3) is provided with a mounting slot (4), and the outer wall is fixedly provided with a clamping protrusion (5).

3. A cast-in-place screw pile construction drilling tool as claimed in claim 2, characterized in that: The outer wall of the hollow drill rod (1) is fixedly mounted with a plurality of groups of main clamping parts (6); the inner wall of the first group of replaceable straight rod sections (3) is assembled together with the main clamping parts (6) outside the hollow drill rod (1) through the installation clamping groove (4); and the remaining plurality of groups of replaceable straight rod sections (3) are assembled and plugged into each other through the installation clamping groove (4) and the clamping protrusions (5).

4. A cast-in-place screw pile construction drilling tool as claimed in claim 2, characterized in that: The plurality of groups of replaceable straight rod sections (3) and the outer wall of the hollow drill rod (1) are provided with threaded holes (7) at positions on the same side thereof, and first bolt members (8) matching therewith are installed inside the threaded holes (7). The first bolt members (8) are engaged with the threaded holes (7) to fix the replaceable straight rod sections (3) and the hollow drill rod (1) together.

5. A cast-in-place screw pile construction drilling tool as claimed in claim 1, characterized in that: A plurality of connecting angled pieces (10) are arranged on the outer surface of the lower side wall of the hollow drill rod (1), and a through hole is formed through the angled section of the connecting angled piece (10), and a second bolt piece (9) penetrating the replaceable spiral section (2) is installed in the through hole, and the replaceable spiral section (2) is fixed by the cooperation of the second bolt piece (9) and the connecting angled piece (10).

6. A cast-in-place screw pile construction drilling tool as claimed in claim 1, characterized in that: The outer surface of the lower side wall of the hollow drill rod (1) is also movably hinged with an arc-shaped clamp (12) through a hinge mechanism (11). A plurality of groups of arc-shaped clamps (12) are arranged in a spiral shape along the outer circumference of the hollow drill rod (1). A resistance groove (13) capable of increasing the self-reverse rotation resistance of the hollow drill rod (1) is provided on the other side of the arc-shaped clamp (12). The resistance groove (13) is a triangular hollow groove body. A built-in limiting cavity (14) is provided at a position corresponding to the other side of the outer wall of the hollow drill rod (1) and the arc-shaped clamp (12). A movable clamping ball (15) is installed in the built-in limiting cavity (14). A telescopic rod (16) is fixed on the movable clamping ball (15). The other end of the telescopic rod (16) is hinged to the arc-shaped clamp (12).

7. A cast-in-place screw pile construction drilling tool as claimed in claim 1, characterized in that: A drill bit (17) is fixed to the bottom of the hollow drill rod (1), and a plurality of grouting holes (18) are formed on the drill bit.

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