Soil removal equipment and pile driving machine
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- SHIMIZU CORP
- Filing Date
- 2022-06-24
- Publication Date
- 2026-05-26
Smart Images
Figure 0007865803000001 
Figure 0007865803000002 
Figure 0007865803000003
Abstract
Description
Technical Field
[0001] The technology disclosed in this specification relates to an earth discharge device attached to a drilling rod for drilling a hole for embedding an existing pile, and a pile driver including the earth discharge device and the drilling rod.
Background Art
[0002] As a method for constructing a foundation pile, there is a method of drilling a pile hole to a support layer and embedding an existing pile in the pile hole. Drilling of the pile hole is performed by a pile driver having a drilling rod and a drilling head provided at the tip of the drilling rod (for example, Patent Document 1). A kneading drum for kneading the excavated soil onto the hole wall of the pile hole may be attached to the drilling rod.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] When drilling a pile hole, the discharge of soil (hereinafter referred to as "earth discharge") depends on drilling water. Therefore, when there is little drilling water or the number of repetitions of the drilling rod is small, there is a risk that the earth discharge cannot be sufficiently performed. Such a problem is particularly likely to occur with relatively large clay lumps. In addition, since the kneading drum is a fixed member, when the drilling rod descends, the excavated soil may settle again. If the earth discharge cannot be sufficiently performed or the soil settles again, for example, soil (such as clay lumps) may remain in the root expansion consolidation part, causing insufficient strength of the root consolidation part soil cement.
[0005] This specification discloses a technology capable of solving the above-described problems.
Means for Solving the Problems
[0006] The technologies disclosed herein can be implemented, for example, in the following forms:
[0007] (1) The soil removal device disclosed herein is a device attached to an excavation rod for excavating a pile hole for burying a precast pile, and comprises a main body attached to the excavation rod and at least one variable wing. The lower end of at least one variable wing is attached to the main body. The upper end of at least one variable wing is Drilling rod A closed state that approaches the upper end Drilling rod It is configured to switch between an open state, which is far from the target, and another state.
[0008] In this soil removal device, when the drilling rod is lowered, the variable blades receive a downward load from the drilling water flow or inertial force, causing the blades to close, which prevents the excavated soil from interfering with the blades and settling again. When the drilling rod is raised, the variable blades receive an upward load from the drilling water flow or inertial force, causing the blades to open, which collects the soil and transports it upward. Thus, this soil removal device enables sufficient soil removal from the pile hole and prevents the excavated soil from settling again, improving soil removal efficiency. As a result, for example, it is possible to prevent soil (clay lumps, etc.) from remaining in the enlarged foundation reinforcement area, and to prevent insufficient strength of the soil cement in the foundation reinforcement area. Furthermore, as a result of improving soil removal efficiency with this soil removal device, it is possible to reduce the amount of drilling water, thereby reducing the environmental burden associated with construction.
[0009] (2) The above soil removal device may be configured to include a plurality of variable blades. With this soil removal device, mud can be efficiently collected by the plurality of variable blades, and the soil removal efficiency can be further improved.
[0010] (3) In the soil removal device described above, the plurality of variable blades may be configured to include at least one pair of variable blades that face each other radially across the main body. With this soil removal device, the mud in the pile hole can be collected evenly by the pair of variable blades, and the soil removal efficiency can be further improved.
[0011] (4) In the soil removal device described above, the plurality of variable blades may be configured to include a plurality of pairs of variable blades that are radially opposed to each other with the main body in between. With this soil removal device, the plurality of pairs of variable blades can collect mud in the pile hole more evenly, and the soil removal efficiency can be further improved.
[0012] (5) In the above soil removal device, a configuration may be provided in which a gap exists between the multiple variable blades in the open state when viewed from above. With this soil removal device, the mud collected by the multiple variable blades can be efficiently removed on the ground, thereby improving work efficiency.
[0013] Furthermore, the technologies disclosed herein can be implemented in various forms, for example, in the form of a soil removal device, a pile driver equipped with a soil removal device and an excavation rod, and a method for excavating pile holes using a pile driver. [Brief explanation of the drawing]
[0014] [Figure 1] An explanatory diagram showing the side configuration of the pile driver 100 when the drilling rod 20 is being lowered. [Figure 2] An explanatory diagram showing the side configuration of the pile driver 100 when the drilling rod 20 is being raised. [Figure 3] Explanatory diagram showing the top configuration of the pile driver 100 [Modes for carrying out the invention]
[0015] A. Embodiments: Figures 1 to 3 are explanatory diagrams showing the configuration of the pile driver 100 in this embodiment. The pile driver 100 is a heavy machine for excavating a pile hole 102 and burying a pre-fabricated pile in the pile hole 102. Figure 1 shows a partial side view of the pile driver 100 when the excavation rod 20, which will be described later, is being lowered inside the pile hole 102. Figure 2 shows a partial side view of the pile driver 100 when the excavation rod 20 is being raised inside the pile hole 102. Figure 3 shows a partial top view of the pile driver 100 when the excavation rod 20 has been raised until the soil removal device 10, which will be described later, is above ground.
[0016] The pile driver 100 includes a drilling rod 20 and a soil removal device 10. The drilling rod 20 is a rod-shaped member used in a vertically extended position. The drilling rod 20 may consist of a single rod-shaped element or a configuration in which multiple rod-shaped elements are connected to each other. One end (lower end) of the drilling rod 20 is provided with a drilling head (not shown) having a drilling blade. The other end (upper end) of the drilling rod 20 is connected to an auger (not shown) of the pile driver 100. The drilling rod 20 is rotated around its central axis by the auger and moved vertically. A mixing drum (not shown) for mixing the excavated soil 106 into the hole wall 104 of the pile hole 102 may be attached to the drilling rod 20.
[0017] The soil removal device 10 is a device that facilitates soil removal when a pile driver 100 excavates a pile hole 102. The soil removal device 10 has a main body 12 and variable blades 14. In this embodiment, the soil removal device 10 has four variable blades 14. As shown in Figure 3, the four variable blades 14 are arranged in a line so as to be offset by 90° from each other around the longitudinal axis of the excavation rod 20. Therefore, the soil removal device 10 includes two pairs of variable blades 14 that face each other radially with the main body 12 in between.
[0018] The main body 12 of the soil discharging device 10 is attached to the boring rod 20. More specifically, the main body 12 is a cylindrical member extending in the vertical direction, and the main body 12 is fixed to the boring rod 20 with the boring rod 20 inserted through the hollow portion of the main body 12. When a kneading drum is attached to the boring rod 20, it is preferable that the main body 12 of the soil discharging device 10 is attached at a position below the kneading drum.
[0019] The variable wing 14 of the soil discharging device 10 is a substantially plate-shaped member. The lower end of the variable wing 14 is attached to the main body 12. On the other hand, the upper end of the variable wing 14 is a free end. The attachment portion between the variable wing 14 and the main body 12 has a hinge structure, and the variable wing 14 can rotate (open and close) with respect to the main body 12 with the lower end as a fulcrum. Therefore, the variable wing 14 switches between a closed state (see FIG. 1) where the upper end approaches the main body 12 and an open state (see FIG. 2) where the upper end moves away from the main body 12.
[0020] In this embodiment, the variable wing 14 (see FIG. 1) in the closed state is substantially parallel to the longitudinal direction of the boring rod 20. The angle formed between the variable wing 14 (see FIG. 2) in the open state and the longitudinal direction of the boring rod 20 is set to about 15° to 45°, for example. Also, as shown in FIG. 3, a gap G1 exists between the plurality of variable wings 14 in the open state when viewed in the vertical direction.
[0021] Next, the operation of the soil discharging device 10 will be described. As shown in FIG. 1, when the boring rod 20 is descending, the variable wing 14 receives the downward load from the boring water flow or, due to inertia, the variable wing 14 becomes the closed state. Therefore, a gap through which the soil 106 passes between the hole wall 104 of the pile hole 102 and the variable wing 14 is secured. Thereby, it is suppressed that the excavated soil 106 interferes with the variable wing 14 and settles again.
[0022] On the one hand, as shown in FIG. 2, when the excavation rod 20 is rising, the variable wing 14 receives the upward load from the excavation water flow, or due to the inertial force, the variable wing 14 is in an open state. Therefore, the upper end of the variable wing 14 approaches the hole wall 104 of the pile hole 102, and the soil 106 in the pile hole 102 is mechanically collected by the variable wing 14 and carried out upward. Even for relatively large clay lumps that are difficult to discharge by the excavation water, they can be effectively collected and discharged by the variable wing 14.
[0023] As shown in FIG. 3, when the excavation rod 20 has risen until the variable wing 14 emerges from the ground, for example, the high-pressure washer 30 is used to remove the soil 106 collected by the variable wing 14. As described above, since there is a gap G1 between the plurality of variable wings 14 in the open state when viewed in the vertical direction, the soil 106 collected by the variable wing 14 can be efficiently removed through the gap G1. After that, as appropriate, the lowering of the excavation rod 20 shown in FIG. 1 and the rising of the excavation rod 20 shown in FIG. 2 are repeated, and the excavation of the pile hole 102 is carried out to a predetermined depth.
[0024] As described above, the soil discharging device 10 of the present embodiment is a device attached to the excavation rod 20 for excavating the pile hole 102 for embedding an existing pile. The soil discharging device 10 includes a main body portion 12 attached to the excavation rod 20 and at least one variable wing 14. The lower end portion of the variable wing 14 is attached to the main body portion 12. The variable wing 14 is configured to switch between a closed state where the upper end portion approaches the main body portion 12 and an open state where the upper end portion moves away from the main body portion 12.
[0025] Because the soil removal device 10 of this embodiment has the above configuration, when the excavation rod 20 is lowered, the variable wing 14 is in a closed state, preventing the excavated mud 106 from interfering with the variable wing 14 and settling again. When the excavation rod 20 is raised, the variable wing 14 is in an open state, and the mud 106 is collected by the variable wing 14 and transported upward. In this way, the soil removal device 10 of this embodiment can achieve sufficient soil removal from the pile hole 102 and prevent the excavated mud 106 from settling again, thereby improving soil removal efficiency. As a result, for example, it is possible to prevent mud (clay lumps, etc.) from remaining in the enlarged foundation reinforcement section, and to prevent insufficient strength of the soil cement in the foundation reinforcement section. Furthermore, as a result of improving soil removal efficiency with the soil removal device 10, it is possible to reduce excavation water, thereby reducing the environmental burden associated with construction.
[0026] Furthermore, the soil removal device 10 of this embodiment is equipped with a plurality of variable blades 14. Therefore, according to the soil removal device 10 of this embodiment, the mud 106 can be efficiently collected by the plurality of variable blades 14, and the soil removal efficiency can be further improved.
[0027] Furthermore, the soil removal device 10 of this embodiment includes two pairs of variable blades 14 that are radially opposed to each other, flanking the main body 12. Therefore, with the soil removal device 10 of this embodiment, the two pairs of variable blades 14 can evenly collect the mud 106 in the pile hole 102, further improving soil removal efficiency.
[0028] Furthermore, in the soil removal device 10 of this embodiment, a gap G1 exists between the multiple variable wings 14 in the open state when viewed from above. Therefore, according to the soil removal device 10 of this embodiment, the mud 106 collected by the multiple variable wings 14 can be efficiently removed on the ground, thereby improving work efficiency.
[0029] B. Variations: The technologies disclosed herein are not limited to the embodiments described above and can be modified in various forms without departing from their essence, for example, the following modifications are possible.
[0030] The configuration of the pile driver 100 and the soil removal device 10 included in the pile driver 100 in the above embodiment is merely an example and can be modified in various ways. For example, in the above embodiment, the soil removal device 10 has four variable blades 14, but the number of variable blades 14 in the soil removal device 10 may be three or less, or five or more. Also, in the above embodiment, the soil removal device 10 includes two pairs of variable blades 14 that face each other radially on either side of the main body 12, but the soil removal device 10 may include one pair of variable blades 14 that face each other radially on either side of the main body 12, or it may include three or more pairs of variable blades 14 that face each other radially on either side of the main body 12. Furthermore, the soil removal device 10 does not have to include a set of two variable blades 14 that face each other radially on either side of the main body 12.
[0031] In the above embodiment, a gap G1 exists between the multiple open variable wings 14 when viewed in the vertical direction, but the configuration may be such that there is no gap between the multiple open variable wings 14. [Explanation of Symbols]
[0032] 10: Soil removal device 12: Main body 14: Variable blade 20: Excavation rod 30: High washer 100: Pile driver 102: Pile hole 104: Borehole wall 106: Mud G1: Gap
Claims
1. A soil removal device attached to an excavation rod for excavating pile holes for burying pre-fabricated piles, The main body attached to the drilling rod, At least one variable wing, the lower end of which is attached to the main body, and configured to switch between a closed state in which the upper end is close to the drilling rod and an open state in which the upper end is away from the drilling rod, A soil removal device equipped with the following features.
2. The soil removal device according to claim 1, A soil removal device comprising multiple variable-blade wings.
3. The soil removal device according to claim 2, A soil removal device comprising a plurality of variable blades, each including at least one pair of variable blades facing each other radially across the main body.
4. The soil removal device according to claim 3, A soil removal device comprising a plurality of variable blades, each including a plurality of pairs of variable blades facing each other radially across the main body.
5. The soil removal device according to claim 2, A soil removal device in which, when viewed from above, there are gaps between the multiple variable blades in the open state.
6. A drilling rod and A soil removal device according to any one of claims 1 to 5 attached to the excavation rod, A pile driver equipped with the following features.