Drilling and reaming drilling tool for pile foundation construction
By using symmetrical reaming rods and hydraulically driven reaming devices in the drilling tool design, the problem of gravel falling to the bottom of the hole is solved, and the accurate placement of prefabricated pipe piles and the improvement of reaming efficiency are achieved.
Patent Information
- Application Number
- CN202422542537.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-10-21
AI Technical Summary
When existing drilling tools encounter scattered gravel layers, the gravel will easily fall to the bottom of the hole during the drilling process, resulting in blockage, making it difficult to ensure that the prefabricated pipe piles reach the designed pile bottom elevation, and the bottom expansion efficiency and hardness of the hole expansion device are insufficient.
A drill tool for pile foundation construction is designed. The symmetrical reaming rod is used to drill the drill rod and the width is equal to or greater than the outer diameter of the spiral blade when the drill rod is forwardly rotated and drilled. Combined with the reaming device driven by the hydraulic cylinder, the reaming rod is in contact with the hole wall and is equipped with cut-offs to improve the expansion ability and hardness.
Effectively prevent gravel from falling to the bottom of the hole, ensure that the prefabricated pipe piles meet the design elevation, and improve the hole reaming efficiency and the hardness and strength of the device.
Smart Images
Figure CN223177476U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pile foundation construction, and specifically relates to a drilling and hole expanding tool for pile foundation construction. Background Art
[0002] The static drilling and root planting pile is a kind of foundation pile that has been applied more in recent years. Generally, a drilling tool with a drill bit at the bottom end of the drill pipe, a spiral blade and a grouting device on the drill pipe is used to drill a hole while spraying cement slurry to form a cement-soil pile hole. Then, the bottom hole expanding device of the drilling tool is opened to expand the bottom, and after the bottom hole expanding device is retracted to the drilling state, the drill is pulled out. Then, a press-fitting type pile planting device is used to plant the pile by using the self-weight of the precast pipe pile. Generally, one pile or two piles are welded and lengthened on the ground to form a whole pile.
[0003] However, in the drilling practice, the drilling tools of the above existing technologies still have the following deficiencies: 1. When encountering a scattered gravel layer such as a pebble layer, during the drilling process, when the drill pipe penetrates through the scattered gravel layer such as a pebble layer, the pebbles on the spiral blade can be carried to the ground as the spiral blade rotates upward. However, when pulling out the drill, the pebbles on the spiral blade often fall to the bottom of the hole due to their own weight along the spiral blade, resulting in blockage and making it impossible to place the precast pipe pile or the core pile to the designed pile bottom elevation. 2. For the existing bottom hole expanding devices or hole expanding devices, the bottom hole expanding states are all that two symmetrically inclined upper rods are hinged to two symmetrically inclined lower rods, and the bottom hole is expanded relying on the symmetric hinge points, that is, the hole expanding device and the bottom hole wall are in line contact in the bottom hole expanding state, and it is generally difficult to set pick teeth at the hinge points, and their bottom hole expanding efficiency, bottom hole expanding ability, and the hardness and strength of the bottom hole expanding device are all insufficient. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is to provide a drilling and hole expanding tool for pile foundation construction that can prevent the gravel in the scattered gravel layer from falling to the bottom of the hole when pulling out the drill.
[0005] The technical solution of the utility model is to provide a drilling and hole expanding tool for pile foundation construction, which includes a drill bit at the bottom end of the drill pipe, a spiral blade arranged on the outer circumference of the drill pipe, a hole expanding device arranged at the lower end of the drill pipe, and a grouting device arranged on the drill pipe; the hole expanding device includes a hydraulic cylinder fixed in the hollow pipe of the drill pipe, an oil inlet pipe and an oil outlet pipe communicated with a ground hydraulic source, a connecting rod hinged to the free end of the piston rod of the hydraulic cylinder for driving the symmetric hole expanding rods to open and close, symmetric vertical long through holes are arranged at the lower end of the drill pipe for the symmetric hole expanding rods to enter and exit; there are notches on the lower spiral blade for the symmetric hole expanding rods to enter and exit; in the state of the drill pipe rotating forward and pulling out the drill, the width dimension of the symmetric hole expanding rods is equal to or greater than the outer diameter dimension of the spiral blade.
[0006] After adopting the above structure, the drill for borehole reaming in the construction of the pile foundation of the utility model has the following advantages: Even when encountering a scattered gravel layer such as a pebble layer, since the width dimension of the symmetric reaming rods in the state of forward rotation and drill pulling is equal to or greater than the outer diameter dimension of the spiral blade, the forward-rotating reaming device blocks the passage for gravel such as pebbles to fall along the spiral blade. Some gravel such as pebbles are carried to the cement-soil hole walls in the middle and upper layers and adsorbed therein, and the rest are carried to the ground by the forward-rotating spiral blade, which preferably prevents the gravel such as pebbles on the spiral blade from falling to the bottom of the hole due to their own weight during drill pulling, and prevents the falling gravel from causing blockage at the bottom of the hole, so that the precast pipe pile or core pile cannot reach the designed pile bottom elevation. That is, it can ensure that the precast pipe pile or core pile reaches the designed pile bottom elevation.
[0007] Further, the reaming rod includes two vertically arranged rods symmetrically arranged, two upper inclined rods symmetrically arranged, and two lower inclined rods symmetrically arranged; the bottom ends of the two upper inclined rods are hinged to the top ends of the two vertically arranged rods, and a sliding sleeve is slidably sleeved on the piston rod, and the two sides of the sliding sleeve are hinged to the top ends of the two upper inclined rods; the bottom ends of the two lower inclined rods are hinged to the top ends of the two vertically arranged rods, and the bottom ends of the two lower inclined rods are hinged to the drill bit; a connecting block is fixed to the free end of the piston rod, and the two sides of the connecting block are hinged to the top ends of the two symmetrically arranged connecting rods, and the bottom ends of the two connecting rods are hinged to the hinged joints of their respective lower inclined rods and vertically arranged rods; there are a plurality of cutting teeth arranged up and down on the outer sides of the two symmetrically arranged upper inclined rods, the outer sides of the two vertically arranged rods, and the outer sides of the two lower inclined rods. After adopting the above structure, when the drill rod rotates forward and pulls out the drill, the two vertically arranged rods form a relatively long surface contact with the hole wall, further ensuring the technical effect of preventing the gravel such as pebbles on the spiral blade from falling to the bottom of the hole during drill pulling and enabling the precast pipe pile to reach the designed pile bottom elevation. And the reaming device and the bottom hole wall are in surface contact in the bottom reaming state, and there is a column of cutting teeth arranged vertically for each of them, and its bottom reaming efficiency, bottom reaming ability, and the hardness and strength of the reaming device are all greatly improved.
[0008] Further, each connecting rod is composed of two strip-shaped plates, and a receiving groove for receiving the following reinforcing guide plate is formed between the two strip-shaped plates; the bottom end of each vertically arranged rod is in the middle of the thickness at the hinged joint, and the top end of each lower inclined rod forms a U-shaped block with an upward opening and is clamped on both sides of the bottom end of the vertically arranged rod, and the bottom ends of the two strip-shaped plates are clamped on the outer sides of the two vertical blocks of the U-shaped block, and there are coaxial pin holes at the bottom ends of the two strip-shaped plates, the two vertical plates of the U-shaped block, and the bottom end of the vertically arranged rod, and a hinge shaft is rotatably sleeved in the four coaxial pin holes and is in interference fit with one of the outer pin holes. After adopting the above structure, the connecting rod leaves a space for receiving the following reinforcing guide plate, and the hinge structure strength between the connecting rod and the hinged joint of the bottom end of the vertically arranged rod and the top end of the lower inclined rod is higher, the force is better, and the hinge is more stable and reliable, further improving the bottom reaming efficiency, bottom reaming ability, and the hardness and strength of the reaming device.
[0009] Furthermore, a reinforcing guide plate is symmetrically fixed to the inner sides of each vertical rod. The inner sides of the reinforcing guide plates fit into the receiving grooves of the connecting block and the two strip plates of the connecting rod. This structure enhances the strength of the reaming device, and its transition from retracting during drilling to expanding to prevent falling stones and pebbles during forward rotation and extraction, or expanding to its widest, bottom-expanding position, is flexible, stable, and reliable.
[0010] Furthermore, a bottom plate is fixed to the bottom end of the hollow drill pipe. The drill bit includes the bottom plate and a strip plate fixed to the bottom plate on a diametrical line. The strip plate is fixed with multiple downward-facing drill teeth, with the center drill tooth having the lowest drill tip and the tips of the drill teeth on both sides gradually increasing in height. The bottom ends of the two lower inclined rods are hinged to the top surface of the bottom plate. With this structure, the hinged connection between the reaming device and the drill bit is more flexible, stable, and reliable, and the drill bit itself has better centering and drilling effects, resulting in higher efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a structural diagram of the preferred embodiment of the drilling tool of the utility model in the drilling state ( Figure 1 、 Figure 2 、 Figure 3 and Figure 5 (This is a drawing method to omit the length of the upper part of the drill pipe and tubing).
[0012] Figure 2 This is a schematic diagram of the structure of the preferred embodiment of the drilling tool of the utility model in the state of pulling out the drill Figure 1 .
[0013] Figure 3 This is a schematic diagram of the structure of the preferred embodiment of the drilling tool of the utility model in the state of pulling out the drill Figure 2 .
[0014] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of A in the figure.
[0015] Figure 5 It is a structural schematic diagram of the hole enlarging state of the preferred embodiment of the drilling tool of the present utility model.
[0016] Figure 6 This is a schematic diagram of the drill rod structure after the reaming device and drill bit are removed from the preferred embodiment of the drilling tool of the utility model. Figure 1 ( Figure 6 - Figure 7 (This is a drawing method that omits the length of the upper part of the drill pipe).
[0017] Figure 7 This is a schematic diagram of the drill rod structure after the reaming device and drill bit are removed from the preferred embodiment of the drilling tool of the utility model. Figure 2 .
[0018] Figure 8Schematic diagram of the reaming device and drill bit after removing the drill pipe in the drilling state of the preferred embodiment of the drill of the present utility model( Figure 8 - Figure 10 (Drawing method for omitting the upper length of the oil pipe).
[0019] Figure 9 Schematic diagram of the reaming device and drill bit after removing the drill pipe in the drill pulling state of the preferred embodiment of the drill of the present utility model.
[0020] Figure 10 Schematic diagram of the reaming device and drill bit after removing the drill pipe in the reaming state of the preferred embodiment of the drill of the present utility model.
[0021] As shown in the figure:
[0022] 1. Drill pipe, 11. Spiral blade, 111. Notch, 12. Hollow pipe, 121. Vertical long through hole, 122. Outer circumferential surface;
[0023] 2. Drill bit, 21. Bottom end plate, 22. Second strip-shaped plate, 23. Drill teeth;
[0024] 3. Reaming device, 31. Hydraulic cylinder, 311. Piston rod, 32. Inlet oil pipe, 33. Outlet oil pipe, 34. Reaming rod, 341. Vertical rod, 342. Upper inclined rod, 343. Lower inclined rod, 3431. C-shaped block, 35. Picks, 36. Sliding sleeve, 37. Connecting block, 371. First accommodating groove, 38. Connecting rod, 381. First strip-shaped plate, 3811. Pin through hole, 382. Second accommodating groove, 39. Hinge shaft, 310. Reinforcing guide plate. Detailed implementation manners
[0025] The following further describes the detailed implementation manners of the present utility model with reference to the accompanying drawings. It should be noted here that the description of these detailed implementation manners is used to help understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the following detailed implementation manners of the present utility model can be combined with each other as long as they do not conflict with each other.
[0026] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 shown.
[0027] Preferred embodiment of a drilling and hole expanding tool for pile foundation construction of the present utility model, which includes a drill bit 2 at the bottom end of a drill pipe 1, a spiral blade 11 arranged on the outer circumference of the drill pipe 1, a hole expanding device 3 arranged at the lower end of the drill pipe 1, and a slurry spraying device (not shown in the figure) arranged on the drill pipe 1. The slurry spraying device generally includes a pump and a cement slurry tank arranged on the ground, a slurry conveying pipe arranged in the hollow pipe 12 of the drill pipe, and one or more slurry spraying nozzles arranged at the drill bit 2 and communicated with the slurry conveying pipe. The hole expanding device 3 includes a hydraulic cylinder 31 fixed in the hollow pipe 12 of the drill pipe, an oil inlet pipe 32 and an oil outlet pipe 33 communicated with a ground hydraulic source such as an oil pump and an oil tank, a connecting rod 38 hinged at the free end of a piston rod 311 of the hydraulic cylinder 31 for driving the opening and closing of symmetric hole expanding rods 34, and vertical long through holes 121 symmetrically arranged at the lower end of the drill pipe 1 for the symmetric hole expanding rods 34 to enter and exit. The above is the prior art.
[0028] There is a notch 111 on the spiral blade 11 at the lower end of the drill pipe 1 for the symmetric hole expanding rods 34 to enter and exit. In the state of the drill pipe 1 rotating forward and pulling out the drill, the width dimension of the symmetric hole expanding rods 34 when unfolded is equal to or greater than the outer diameter dimension of the spiral blade 11. As described below, the width between the outer sides of the two symmetric vertical rods 341 in the state of the drill pipe 1 rotating forward and pulling out the drill is equal to or greater than the outer diameter of the spiral blade 11. It is not difficult to understand that the notch 111 is also called an opening; the outer sides of the two symmetric vertical rods 341 do not include the width of the cutting teeth 35 extending out, but only refer to the width dimension between the outer sides of the vertical rods 341 themselves; the measurement of the outer diameter of the spiral blade 11 is the prior art, such as the caliper measurement method, digital caliper measurement method, internal diameter measuring instrument measurement method, and height gauge measurement method can be used for measurement.
[0029] The reaming rod 34 includes two vertically arranged rods 341 symmetrically disposed, two upper inclined rods 342 symmetrically disposed, and two lower inclined rods 343 symmetrically disposed. The front view shape of the reaming rod 34 is generally spindle-shaped. The bottom ends of the two upper inclined rods 342 are hinged to the top ends of the two vertically arranged rods 341. A sliding sleeve 36 is slidably sleeved on the piston rod 311. The two sides of the sliding sleeve 36 are hinged to the top ends of the two upper inclined rods 342. The bottom ends of the two lower inclined rods 343 are hinged to the top ends of the two vertically arranged rods 341, and the bottom ends of the two lower inclined rods 343 are hinged to the drill bit 2. A connecting block 37 is fixed to the free end of the piston rod 311. The two sides of the connecting block 37 are hinged to the top ends of the two symmetrically arranged connecting rods 38. The bottom ends of the two connecting rods 38 are hinged to the hinge joints of their respective lower inclined rods 343 and vertically arranged rods 341. On the outer sides of the two symmetrically arranged upper inclined rods 342, the outer sides of the two vertically arranged rods 341, and the outer sides of the two lower inclined rods 343, there are a plurality of picks 35 arranged vertically. The picks 35 are also called drill teeth. The connecting block 37 may adopt the following specific structure: A circular sleeve is fixed to the free end, i.e., the bottom end, of the piston rod 311. Two ear plates are respectively fixed on both sides of the circular sleeve. There are pin shaft through holes on both ear plates, which are aligned with the pin shaft through holes at the top ends of the first strip-shaped plates 381 respectively, and then are hinged through their respective hinge shafts, such as a total of four hinge shafts. A receiving groove for accommodating the strengthening guide plate 310, such as the first receiving groove 371, is formed between the two ear plates of each. The terms hinge shaft and pin shaft can be used interchangeably.
[0030] Each connecting rod 38 is composed of two strip-shaped plates, such as the first strip-shaped plates 381. A receiving groove for accommodating the strengthening guide plate 310, such as the second receiving groove 382, is formed between the two strip-shaped plates, such as the first strip-shaped plates 381. The bottom end of each vertically arranged rod 341 is located in the middle of the thickness at this hinge joint. The top end of each lower inclined rod 343 forms a U-shaped block 3431 with an upward opening, which is clamped on both sides of the bottom end of the vertically arranged rod 341. The bottom ends of the two first strip-shaped plates 381 are clamped on the outer sides of the two vertical blocks of the U-shaped block 3431. There are coaxial pin shaft through holes at the bottom ends of the two first strip-shaped plates 381, the two vertical plates of the U-shaped block 3431, and the bottom end of the vertically arranged rod 341. A hinge shaft 29 is rotatably sleeved in the four coaxial pin shaft through holes and is in interference fit with an outer pin shaft through hole 3811 for axial limitation.
[0031] One strengthening guide plate 310 is symmetrically fixed to the inner sides of the two vertically arranged rods 341. The inner side of the strengthening guide plate 310 can be embedded into the receiving groove for accommodating the connecting block 37, such as the first receiving groove 371, and the receiving groove formed by the two strip-shaped plates 381 of the connecting rod 38, such as the second receiving groove 382.
[0032] At the bottom end of the hollow pipe 12 of the drill pipe 1, a bottom end plate 21 is fixed. The drill bit 2 includes a bottom end plate 21 and a strip plate, such as the second strip plate 22, fixed on a diameter line of the bottom end plate 21. A plurality of downward drill teeth 23 are fixed on the second strip plate 22. The drill tips of the middle drill teeth 23, such as the middle two drill teeth 23, have the lowest height, and the drill tips of the drill teeth 23 on both sides gradually increase. For example, the drill tips of the two outermost ones among the middle two are higher than the middle two, and the drill tips of the outermost two have the highest height. It is also possible to draw a line through the center of the bottom end plate 21. The three drill teeth 23 at one end of the second strip plate 22 are on one side of the width of the second strip plate 22, and the three drill teeth 23 at the other end of the second strip plate 22 are on the other side of the width of the second strip plate 22, so as to better center the drilling and the effect of lowering the drill. The bottom ends of the two downward inclined rods 343 are hinged to the top surface of the bottom end plate 21.
[0033] All the above-mentioned hinges can adopt a hinge pin through-hole provided on the plate. After the hinge pin passes through its respective hinge pin through-hole, it is in interference fit with one of the hinge pin through-holes, so that the hinge can rotate; it can be that one end plate is hinged to another end plate, or it can be that one end plate is hinged to the two side plates of the U-shaped block formed by the other end plate, so that relative rotation at the hinge can also be achieved. All the above-mentioned fixings are, for example, welding or screwing with multiple screws. The terms pin through-hole and pin through-bore can be used interchangeably.
[0034] During the drilling process, the reaming process or the under-reaming process, and the pile pulling process, the drill pipe 1 rotates forward, such as clockwise.
[0035] Before drilling, the controller of the drilling rig controls the hydraulic pump to retract the reaming device 3 to the narrowest state, such as Figure 1 As shown in, each row of cutting teeth 35 on the outer sides of the respective two vertical rods 341 protrudes outward from the outer circumferential surface 122 of the drill pipe 1, but does not affect the soil and gravel, such as pebbles, from being carried to the ground along the upward spiral blade 11.
[0036] Before under-reaming, the controller controls the hydraulic pump to open the reaming device 3 to the widest state as shown in Figure 5 and Figure 10 shown.
[0037] Before pulling out the drill, the controller controls the hydraulic pump to retract the reaming device 3 from the widest state to such a state that the width dimension on the outer sides of the two vertical rods 341 themselves shown in Figure 2 is equal to or greater than the outer diameter dimension of the spiral blade 11. The vertical rod 341 is also called a perpendicular rod.
[0038] The components, structures, quantities, etc. not marked above are not shown in the drawings. Some components are shown in the drawings but not marked in the text. The drawings are only schematic. If there are inconsistencies between the drawings and the text description, or inconsistencies among the drawings, the text description shall prevail.
[0039] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A drilling tool for drilling and reaming in pile foundation construction, comprising a drill bit at the bottom end of a drill pipe, a spiral blade arranged on the outer circumference of the drill pipe, a reaming device arranged at the lower end of the drill pipe, and a slurry spraying device arranged on the drill pipe; the reaming device includes a hydraulic cylinder fixed in the hollow pipe of the drill pipe, an oil inlet pipe and an oil outlet pipe communicated with a ground hydraulic source, a connecting rod hinged to the free end of the piston rod of the hydraulic cylinder for driving the symmetrical reaming rods to open and close, and vertical long through holes for the symmetrical reaming rods to enter and exit are symmetrically arranged at the lower end of the drill pipe; characterized in that: There are notches on the spiral blade at the lower end of the drill pipe for the symmetrically arranged reaming rods to enter and exit; when the drill pipe rotates forward to pull out the drill, the width dimension of the symmetrically arranged reaming rods in the unfolded state is equal to or greater than the outer diameter dimension of the spiral blade.
2. The drill for drilling and reaming in pile foundation construction according to claim 1, characterized in that: The reaming rod includes two vertically arranged rods symmetrically, two upwardly inclined rods symmetrically, and two downwardly inclined rods symmetrically; the bottom ends of the two upwardly inclined rods are hinged to the top ends of the two vertically arranged rods, a sliding sleeve is sleeved on the piston rod in a sliding manner, and the two sides of the sliding sleeve are hinged to the top ends of the two upwardly inclined rods; the bottom ends of the two downwardly inclined rods are hinged to the top ends of the two vertically arranged rods, and the bottom ends of the two downwardly inclined rods are hinged to the drill bit; a connecting block is fixed at the free end of the piston rod, and the two sides of the connecting block are hinged to the top ends of the two symmetrically arranged connecting rods, and the bottom ends of the two connecting rods are hinged to the hinge points of their respective downwardly inclined rods and vertically arranged rods; there are a plurality of cutting teeth arranged vertically on the outer sides of the two symmetrically arranged upwardly inclined rods, the outer sides of the two vertically arranged rods, and the outer sides of the two downwardly inclined rods.
3. The drilling tool for hole enlargement during pile foundation construction according to claim 2, characterized in that: Each connecting rod is composed of two strip-shaped plates, and a receiving groove is formed between the two strip-shaped plates; the bottom end of each vertically arranged rod is located in the middle of the thickness at the hinge point, the top end of each downwardly inclined rod forms a U-shaped block with an upward opening and is clamped on both sides of the bottom end of the vertically arranged rod, the bottom ends of the two strip-shaped plates are clamped on the outer sides of the two vertical blocks of the U-shaped block, and there are coaxial pin holes at the bottom ends of the two strip-shaped plates, the two vertical plates of the U-shaped block, and the bottom end of the vertically arranged rod. A hinge shaft is rotatably sleeved in the four coaxial pin holes and is in interference fit with one of the outer pin holes.
4. The drilling tool for drilling and reaming in pile foundation construction according to claim 3, characterized in that: On the inner sides of the two vertically arranged rods, one strengthening guide plate is symmetrically fixed respectively, and the inner sides of the strengthening guide plates can be embedded into the receiving groove formed by the receiving groove of the connecting block and the two strip-shaped plates of the connecting rod.
5. The drill for drilling and reaming in pile foundation construction according to claim 2, wherein: A bottom end plate is fixed at the bottom end of the hollow pipe of the drill pipe; the drill bit includes a bottom end plate and a strip-shaped plate fixed on a diameter line of the bottom end plate. A plurality of downwardly facing drill teeth are fixed on the strip-shaped plate. The drill tip height of the middle drill tooth is the lowest, and the drill tip heights of the drill teeth on both sides gradually increase; the bottom ends of the two downwardly inclined rods are hinged to the top surface of the bottom end plate.