JPS6133953B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has been praised as a noiseless and vibrationless construction method. This relates to an expanded auger head used in the so-called medium excavation method.

Among the current pile driving methods, this type of hollow excavation method is attracting attention, especially from the viewpoint of pollution prevention measures. In order to efficiently excavate thick parts of concrete piles when driving piles in places with hard soil and ground, a sub-excavation blade is installed at or near the tip of the screw auger, and this blade is expanded. A mechanical auger head is used that opens (expands) to excavate the thick part of the peripheral wall of the pile.

However, with this type of auger head, when an abnormal impact is applied to the excavator blade, the diameter reduction (folding) of the excavator blade does not work properly, making it difficult to remove the auger head from the pile, or in the worst case scenario. In some cases, double piling work is carried out in which the auger head is left in the ground and other piles are driven nearby, resulting in a reduction in work efficiency. In addition, there were also problems such as damage to the pile itself. In particular, excavation in places with hard geology cannot be done efficiently with conventional machines, and there has been a strong demand for improvements.

In view of the above, it is an object of the present invention to provide an enlarged auger head which is highly efficient in excavation and which has been improved to eliminate the problems of the prior art.

Embodiments of the present invention will be described based on the drawings.

Reference numeral 1 denotes a cylindrical auger head main body having a hollow portion 1a, leaving a certain length at the tip thereof, and spiral blades 2, 2' on the outer circumferential surface at approximately symmetrical positions at an appropriate helical angle. The spiral blades 2, 2' are wound in two strips, and compressed air ventilation pipes 4, 4' having communication holes 3, 3' communicating with the cavity 1a are provided at the tip of each spiral blade 2, 2'. . Check valves 5, 5' for opening and closing the ventilation pipes 4, 4' are removably attached to the outlets of the ventilation pipes 4, 4' to prevent backflow of excavated soil and air. In addition, ventilation pipe 4,
4' is preferably installed in the tangential direction of the main body 1,
This is because manufacturing and assembling the fish tail and excavation teeth, which will be described later, becomes easier, and the air blows out smoothly. A pair of inverted piece-shaped fish tails 6 and 6' are attached to the outer peripheral surface of the tip remaining on the main body 1. Its installation position is vertically installed in parallel to the main body 1, and is attached to the above-mentioned ventilation pipes 4, 4'.
It is mounted parallel to the This is because manufacturing becomes easier in relation to the stopper described later. Furthermore, it is preferable that the helical blades 2, 2' in a spiral shape extend close to the upper ends of the fish tails 6, 6', thereby increasing the discharge of excavated soil and the strength of the excavating teeth. be able to. Reference numerals 7 and 7' denote enlarged excavated teeth which are pivotally attached to the fish tails 6 and 6' with a stop pin or the like, and are rotatable (expandable and retractable) about the stop pin as a fulcrum. In this reduced diameter state, insertion into and removal from the concrete pile is performed, and in the enlarged state, excavation of the thick part of the concrete pile is performed, and the pivot position can be moved to the right end and left end of the fish tails 6, 6'. It is designed to match the dimensions of the concrete pile to be driven. In other words, this is to improve the versatility of the auger head of the present invention, which eliminates the need to prepare and use conventional auger heads of several sizes, and improves economic efficiency and
This helps improve work efficiency. drilling tooth 7,
In order to increase the excavation efficiency and durability of 7', there are several downward-facing pawls 8, 8' at the bottom, and adjustment pawls 9, 8' with setscrews or the like at the tips pointing in the direction of expansion.
9' is provided, and the claws 9, 9' are provided with digging teeth 7,
Protrude slightly from the tip of claw 7', and
9' to supplementally excavate the inner wall. The position of the claws 9, 9' is changed depending on the state of wear and tear, and preferably, the claws 9, 9' are kept in a protruding state at all times.

Reference numerals 10 and 10' denote stoppers attached to the respective fish tails 6 and 6', which are movable in accordance with the movement of the excavating teeth 7 and 7', and whose narrow end portions are used to stop the excavating teeth 7. , 7' are straddled over the bases of the teeth 7, 7' to prevent rotation and unnecessary diameter reduction of the teeth 7, 7', and also to serve as a stopper during reverse rotation. Furthermore, downward stoppers 11, 11' are provided at the ends of the ventilation pipes 4, 4' in order to cope with the earth pressure of the excavating teeth 7, 7'.
7' (extended state of excavation teeth). When the auger head according to the present invention is rotated in the direction of the arrow in FIG. 3, it supports the tips of the excavating teeth 7, 7'. Reference numerals 12 and 12' indicate claws provided on the fish tails 6 and 6' to improve and improve the efficiency of excavation at the tip of the excavation. Reference numeral 13 denotes a valve that controls opening and closing of the jet nozzle at the tip of the main body 1. If the valves 5, 5', and 13 are movably mounted, the compressed air press-fitted into the cavity 1a of the main body 1 will be blown out in three directions from the main body 1 and the outlet of the ventilation pipes 4, 4'. In addition, the valves 5, 5', and 13 are appropriately closed, for example, a predetermined one of the valves 5, 5', and 13 is fixedly attached to each jet port. Valve 13 as an example
If it is fixedly attached to the spout of the main body 1 (valve 13
The valve 13 is fixed to the spout by fixing several places with stop pins. ), the above-mentioned compressed air is ejected in two directions from the ejection ports of both ventilation pipes 4, 4', so that the air ejection direction is changed to adapt to various soil types and improve excavation efficiency. In purpose. 1
Reference numeral 4 denotes a reinforcing member for the valve 13 and the fishtails 6, 6', which are installed on the fishtails 6, 6'.

The present invention provides a pair of fish tails attached to a main body, a drilling tooth having a fulcrum on each fish tail, a ventilation pipe provided at the tip of a pair of helical blades wrapped around the outer peripheral surface of the main body, and the ventilation pipe and the drilling teeth described above. Since the structure is such that the excavation teeth are restricted by stoppers provided on each tooth, the excavation teeth are reinforced by the mounting fulcrum and the stopper, increasing the strength of the excavation teeth and making it suitable for hard soils and ground. It has the excellent effect of reducing the possibility of damage to the drilling teeth and failure to reduce the diameter, which greatly contributes to improving work safety and drilling efficiency. According to the test results conducted by the applicant in the actual field,
The current situation is that many experts and others are amazed at its efficiency.

One stop also serves as a stop for the drilling teeth when the auger head is reversed. Therefore, even if the auger head is unable to reduce its diameter, by repeating normal and reverse rotations of itself, the diameter of the excavating teeth can be reduced (that is, the deflection of the stop pin can be corrected). Even if the diameter cannot be reduced, if the above operation is repeated further, the stop pin that serves as the attachment fulcrum can be easily broken. Naturally, it also becomes possible to carry out enlarged excavation in reverse.

Furthermore, since the present invention uses excavation teeth, adjustable claws, and compressed air that allows you to select three directions of ejection, by appropriately combining these,
It is highly effective in efficiently excavating and piling steel pipes and concrete piles in a variety of soil types.

In addition, since the main body is wrapped with spiral blades that extend close to the excavation teeth, the excavated earth and gravel can be completely discharged and quickly removed. In addition, the mounting fulcrum of the excavation teeth can be moved to the left or right end of the fish tail, allowing excavation to suit the dimensions of concrete piles from large diameters to small diameters, reducing the number of auger head models and improving maintenance management and economy. It is very useful in terms of sexuality.

In the present invention, the fish tails are vertically arranged in parallel at the tip of the main body, and the fish tails are provided with a pair of digging teeth that are in a straight line with the fish tails, so that the earth pressure applied to the digging teeth is in a corresponding relationship between the two, and the force is It has a well-balanced structure and can be used on hard soils and ground. Moreover, since the expansion and contraction of the excavation tooth is a vertical transition, the diameter contraction is performed very smoothly with the addition of its own weight. Furthermore, if an adjustable pawl is provided at the tip of the digging tooth, it is possible to protect the tip of the digging tooth and also make fine adjustments to the digging diameter. In addition, if the ventilation pipe is provided in the tangential direction of the main body, it will be easier to manufacture and assemble the fish tail and excavation teeth, and the earth pressure applied to them will be effectively dealt with, and the air will be ejected from the outlet more efficiently. It becomes smooth.

Furthermore, since a pair of fish tails are provided in parallel at the tip of the main body, it not only reinforces the tip of the main body and the lower spout drilled in the main body, but also improves excavation efficiency at the tip. It can reduce earth pressure.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a perspective view showing an embodiment of the present invention;
FIG. 3 is a front view of the same, FIG. 3 is a bottom view of the same, and FIG. 4 is a front view of another embodiment. 1...Main body, 1a...Cavity part, 2, 2'...Spiral blade,
3, 3'... Communication hole, 4, 4'... Ventilation pipe, 5, 5'...
Valve, 6, 6'...Fish tail, 7, 7'...Drilling tooth, 8, 8', 9, 9'...Claw, 10, 10', 1
1, 11'... Stopper, 12, 12'... Claw, 13
…valve.

Claims (1)

[Scope of Claims] 1. A pair of fish tails hanging in parallel from the tip of a main body having a spout that can be freely opened and closed, and an expandable and contractible fish tail that is pivotally attached to each fish tail, and whose pivot position is located at the left end of each fish tail. Or, it has a digging tooth movably provided at the right end, a pair of spiral wings wrapped around the outer peripheral surface of the main body, and a communicating hole that leads to a cavity bored in the main body provided at the tip of the spiral wing. and regulating the excavation teeth with an air ventilation pipe having a blowout port that can be opened and closed, a stopper provided on the ventilation pipe, and a stopper installed on the fish tail;
An enlarged auger head for use in deep excavation construction, characterized in that the compressed air ejected from the outlet of the main body and the outlet of the ventilation pipe is press-fitted into the cavity of the main body. 2. An enlarged auger head for a hollow excavation method according to claim 1, wherein the tip of the excavation tooth is provided with an adjustable pawl that faces in the direction of expansion. 3. An enlarged auger head for use in a hollow excavation method according to claim 1, wherein the ventilation pipe is provided in the tangential direction of the main body.