JPH018589Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hole-drilling device used in ground improvement methods and the like.

As shown in Figure 1, in strata where good ground a and poor ground b overlap in multiple layers,
There is a method to improve the poor ground by injecting chemicals into the poor ground.

To explain this method, an excavator excavates with a normal bit until good ground a is excavated, and excavates poor ground b by switching to an enlarging device.

A magnifying device is, for example, a device that can magnify the bits outwards in pantograph fashion.

A large diameter hole is made in the poor ground b by drilling while opening the bit of this enlarging device.

In other words, when the excavator is on good ground a, the bit is closed and excavation is carried out, leaving the ground as undisturbed as possible.

On the other hand, in the case of poor ground b, in order to ensure a wide range of stirring and improvement, the method is to open the bit, excavate it, inject the chemical solution, and stir it.

Conventionally, the above method has been widely used, but this method has the following problems.

<A> In order to increase the maximum diameter L of a hole drilled in poor ground b using a conventional expanding device, it is natural to increase the size of the jack, etc. that expands the bit outward in a pantograph style, and to use members to obtain greater strength. It will be necessary to increase the size of the

As a result, the diameter L' of the hole drilled in the good ground a becomes large enough to allow the large excavation equipment as described above to enter and exit.

In other words, if we want to increase L, L' will also inevitably increase.

<B> As a result of the above, even in good ground where there is no need to increase the diameter of the hole, a large diameter hole is required to pass a large excavation device, which disturbs the good ground.

This invention was devised to solve the above problems, and is a hole-expanding device used for ground improvement, etc., which allows for a large ratio between the diameter of the unimproved part and the diameter of the improved part, and allows construction to be carried out without disturbing the good ground as much as possible. The purpose is to provide

Next, embodiments of the present invention will be described based on the drawings. (Fig. 2) The hole expanding device of the present invention includes an inner tube rod 3 that is moved up and down by a jack 2 such as a hydraulic jack, an outer tube rod 4 that accommodates the inner tube rod, and a hole expanding wing 5.
It consists of a rack gear 11 and an enlarged hole main body 1 having a built-in inner tube rod receiver 12.

<A> Inner tube rod The inner tube rod 3 is a hollow cylindrical body, and its upper tip is rotatable within the head tube 31 and is attached so as not to be slidable in the vertical direction.

The head cylinder 31 is provided with an injection liquid inlet 32 and an annular outward flange 33.

An inner tube rod receiver 12 is formed at the lower tip of the inner tube rod 3.

<B> Outer tube rod The outer tube rod 4 houses the inner tube rod 3 inside,
This is a rod that fixes the hole enlarger main body 1 at its lower part and transmits rotation from the drive section D to the hole enlarger main body 1 and the inner tube rod 3.

The upper part has an outer cover 41 around which the jack 2 is installed.

<C> Jacket The jack 2 is located around the outer cover 41 of the outer tube rod 4, connects to the outward flange 33 of the head cylinder 31 on the upper part of the inner tube rod 3, and connects the lightweight inner tube rod 3 side up and down. make it move.

<D> Main body of the enlarged hole The main body 1 of the enlarged hole is a cylindrical body located at the lower part of the outer tube rod 4.

A muddy water injection pipe 19 passes through the hole enlarged part body 1 and is connected to a muddy water discharge pipe 23 which is used to discharge water during preliminary excavation.

Further, a hollow chamber 15, an injection liquid pipe 16, a gear passage 17, and a storage section 18 are provided inside the enlarged hole main body 1.

Then, in each of the above cavities, an inner tube rod receiver 1 is placed.
2. A rack gear 11, a hole expansion wing 5, etc. are each installed inside.

That is, in the cylindrical part of the hole enlarged part main body 1,
A hollow chamber 15 is provided at the top of the main body connected to the outer tube rod 4.
will be established.

Two small-diameter cylindrical portions are formed from the bottom surface of the hollow chamber 15, one of which is used as an injection liquid pipe 16 and the other as a gear passage 17 through which the rack gear 11 is passed.

In the hollow chamber 15, there is an inner pipe rod 3.
Position the inner tube rod receiver 12 at the tip of the tube.

The inner tube rod receiver 12 is a member that slides up and down within the hollow chamber 15 as the inner tube rod 3 moves up and down.

Further, one end of the rack gear 11 is fixed to the inner tube rod receiver 12.

At this time, the space between the inner tube rod receiver 12 and the rack gear 11 may be reinforced with a diagonal member or the like.

This rack gear 11 is a rod-shaped gear that passes through a gear passage 17 and meshes with a pinion gear 51.

Furthermore, the injection liquid from the injection liquid inlet 32 of the head cylinder 31 is passed through the injection liquid pipe 16 in the hole enlarged part main body 1, and the injection liquid pipe 16 is connected to the injection liquid passage 21 in the hole enlarged wing 5.
Connect to.

Furthermore, as shown in FIGS. 3 and 4, slits are provided at the lowest part of the hole-expanding section main body 1 in parallel to the central axes of the inner and outer tubes, and these slits are used as storage sections 18 for the hole-expanding wings.

Further, as other structures, the following cases can be considered.

A rack gear 6 is integrally attached to the lower end of the inner tube rod receiver 12.

Further, a pinion gear 7 is installed which meshes with the rack gear 6 and rotates around a horizontal axis.

Further, a bevel gear 71 is provided on the horizontal axis of the pinion gear 7.

Then, a rod-shaped gear 8 having a separate bevel gear 81 that meshes with this bevel gear 71 at the upper end and a worm gear 82 that meshes with a worm wheel 9, which will be described later, at the lower end, is attached to the enlarged hole main body 1.
It is arranged in the gear passage 17 eccentrically from the axis of the gear.

On the other hand, a worm wheel 9 is integrally attached to the shaft pin of the hole expanding wing 5.

Then, the jack 2 is expanded and contracted to move the head cylinder 31, inner tube rod 3, and rack gear 6 up and down together, and the worm wheel 9 is rotated via the pinion gear 7, bevel gear 71, and rod gear 8.

Thereby, the hole expanding wing 5 can be opened and closed.

As described above, the opening/closing mechanism of the hole-expanding wing 5 of the present invention is composed of only one rack gear 6, one pinion gear 7, one bevel gear 71, one rod gear 8, and one worm wheel 9.

In detail, since the present invention only requires the hole-expanding wing 5 to be protruded and retracted, a simple structure is sufficient in which the center of the hole-expanding wing 5 is fixed with a pin and is opened and closed using the gear member.

The rack gear 6 and the rod gear 8 are elongated gears that are integrally attached to the lower end of the inner tube rod receiver 12 and directed further downward.

Further, the pinion gear 7, the bevel gear 71, and the worm wheel 9 are small circular gears.

Therefore, since these gear members are very small and only one is used at a time, there is no element for increasing the diameter of the enlarged hole main body 1.

Therefore, the diameter of the enlarged hole main body 1 can be kept to a minimum.

Therefore, the hole diameter in the unimproved part of the ground can be reduced, and construction can be carried out without disturbing the good ground as much as possible.

<C> Hole Expansion Wing The hole expansion wing 5 is a plate-shaped member having cutting blades on each side, and a pinion gear 51 is attached to the center thereof, and the hole expansion wing 5 is installed in the storage section 18 .

Therefore, when half of the hole-expanding wing 5 is contained in the storage section 18, the other half is exposed from the tip of the hole-expanding section main body 1 along the axial direction of the hole-expanding section main body 1. .

Furthermore, since the hole-expanding wing 5 is entirely made of a single plate, a complicated pantograph-type link mechanism is not required, just by fixing the center with a pin.

Further, the injection liquid passage 21 installed inside the hole-expanding wing 5 is connected to a chemical liquid injection hole 22 that opens at the tip and intermediate position of the hole-expanding wing 5.

It is also possible to form the hole enlarging wing 5 in a cylindrical shape.

In short, any structure may be used as long as it is configured such that the center thereof is fixed with a pin within the housing portion 18 and does not use a pantograph type link mechanism.

Next, the sixth section explains how to use the hole-expanding device of the present invention.
This will be explained with reference to Figures 9 to 9.

<A> Drilling in good ground Rotation from the drive section is transmitted to the hole expanding section main body 1 via the outer pipe rod 4 while the hole expanding wing 5 is half stored in the storage section 18 of the hole expanding section main body 1.

At this time, the hole-expanding wing 5 extends vertically along the hole-expanding section main body 1, with half of it inside the storage section 18 and the other half exposed to the outside. (Fig. 6) Then, a hole is drilled in the good ground until it reaches the bad ground using the hole-expanding wing 5 exposed to the outside.

<B> Start of hole expansion (Fig. 7) When the poor ground is reached, the inner pipe rod 3 connected to the head cylinder 31 is moved upward by the jack 2.

When the inner tube rod 3 moves upward, the inner tube rod receiver 12 and the rack gear 11 connected thereto move upward, and the pinion gear 51 of the enlarged hole wing 5 that meshes with the rack gear 11 rotates.

Alternatively, if a worm gear is used, the worm gear and worm wheel rotate.

As a result, the hole-expanding wing 5 rotates and begins to be exposed to the outside until it reaches a position perpendicular to the axis of the hole-expanding section main body 1.

At the same time as the hole is enlarged, the chemical liquid etc. injected from the injection liquid inlet 32 of the head cylinder 31 passes through the injection liquid pipe 16 and the injection liquid passage 21 in the hole expansion wing 5, and enters the chemical liquid injection hole 2.
2 and is ejected into the poor ground and stirred.

<C> Storing the hole expansion wing After completing the hole expansion excavation in the improved part B of the poor ground, lower the inner pipe rod 3 using the jack 2 and rotate the hole expansion wing 5 that is deployed horizontally to expand the hole. Half of the hole enlarging wing 5 is housed within the housing portion 18 of the hole body 1. (Figure 9) <D> Drilling holes in multi-layered ground Repeat the above operations and drill while adjusting the diameters of the unimproved part A and the improved part B. (FIG. 1) <E> Other Examples The pinion gear 51 is configured to rotate forward and backward by the reciprocating motion of the rack gear 11, and is not configured to close the excavation and stirring blades due to the resistance of the earth and sand being pulled up.

Therefore, it is not only possible to expand the hole in the improved portion while digging down, but also to expand the hole while pulling up the hole expanding portion main body 1.

Furthermore, when a worm gear is used, a mechanical locking effect is activated and force from the worm wheel side is completely blocked, resulting in high reliability when expanding the hole while pulling it up.

Since the present invention is as explained above, the following effects can be expected.

<A> The hole-expanding wing is a single plate-shaped (or cylindrical) member, and the hole-expanding wing is positioned along the main body of the hole-expanding section while excavating good ground.
Therefore, even if the length of the hole-expanding wing that determines the diameter of the improved portion increases to a certain extent, the hole-expanding device itself does not become larger.

Therefore, even with a hole-expanding device that can drill a large hole in the improved portion, the unimproved portion may be drilled with a diameter somewhat larger than the diameter of the hole-expanding portion main body.

In other words, there is less need to disturb the good ground.

〈B〉 Since the expansion and storage status of the hole expansion wing can be checked from the outside, reliable expansion and stirring can be performed.

That is, when the hole-expanding wings are expanded and retracted, the entire inner tube rod moves up and down relative to the hole-expanding section body.

<C> When excavating the unimproved area, use the hole-expanding wing positioned vertically to excavate, and when reaching the improved area, expand the hole-expanding wing horizontally to stir the excavation.

In this way, the hole-expanding wing serves both as a bit for advance boring and as a bit for hole-expanding.
There is no need to prepare unique bits for each, and the overall structure of the device is simple.

<D> Since there is no pre-boring bit, there is no need for unnecessary work such as digging further than the lower edge of the hole-expanding wing in that area.

Particularly when the strength of the earth and sand in the over-excavation area is high, the presence or absence of such over-excavation greatly affects work efficiency.

<E> Some conventional devices include a cylinder for making the hole-expanding wing move in and out of the main body, and a motor for rotating the hole-expanding wing.

However, since the cylinder and motor are built into the hole-expanding part main body in this way, the diameter of the main body becomes quite large.

Therefore, the diameter of the hole to be drilled in the unimproved part of the ground becomes large, and the good ground that does not need to be drilled is unnecessarily drilled, which disturbs the good ground.

In contrast, the device of the present invention does not rotate the hole-expanding wing, but only protrudes and retracts it, so it has a simple structure in which the center of the hole-expanding wing is fixed with a pin and is opened and closed using a gear member. It's over.

That is, there are no components within the hole enlarged portion main body that would increase the diameter thereof.

Therefore, the diameter of the enlarged hole main body can be kept to a minimum.

Therefore, the diameter of the drilled hole in the unimproved part of the ground can be reduced, and construction can be carried out without disturbing the good ground as much as possible.

<F> By using a worm gear in the opening/closing mechanism of the hole-expanding wing, a mechanical locking effect is activated.

Therefore, since the force from the worm wheel side is completely blocked, reliability is improved when drilling a hole while pulling it up, and it is also possible to perform preliminary boring with the retracted hole drilling wing.

[Brief explanation of the drawing]

Figure 1: Cross-sectional view of drilling by hole drilling device, 2nd~
Figure 4: Longitudinal cross-sectional view of the hole-expanding device of the present invention, Figure 5: Cross-sectional view of the hole-expanding device of the present invention, Figures 6 to 9: Explanatory diagram of how to use it, Figures 10 and 11: Using a worm gear. An explanatory diagram of an example in the case of 1: Expanding hole main body, 2: Jack, 3: Inner tube rod, 4: Outer tube rod, 5: Expanding wing, 11:
Rack gear, 31: Head cylinder, 51: Pinion gear, A: Unimproved part, B: Improved part, a: Good ground,
b: Bad ground.

Claims (1)

[Scope of claim for utility model registration] An outer tube configured to be rotatable, an inner tube housed within the outer tube, and a jack that can be expanded and contracted in the axial direction of the inner tube attached to the upper end of the inner tube to enable vertical movement. The head tube is composed of a head tube, a cylindrical enlarged hole body provided at the lower end of the outer tube, and a shaft whose center is rotatably fixed to the enlarged hole body by a shaft pin perpendicular to the axis of the body. A hole-expanding wing which is a plate-shaped body and also serves as a bit for preliminary boring, one worm wheel integrally attached to the shaft pin of this hole-expanding wing, and an inner tube located in the upper part of the main body of the hole-expanding section. A rack gear attached to the lower end, a pinion gear that meshes with the rack gear and rotates around a horizontal axis, a bevel gear provided on the horizontal axis of the pinion gear, and a separate bevel gear that meshes with the bevel gear on the upper end, and A rod-shaped gear having a worm gear meshing with the worm wheel at the lower end and arranged eccentrically from the axis of the hole-expanding part body, and a hole-expanding wing communicating with the inside of the head cylinder, the inner pipe, and the hole-expanding part main body. a fluid injection path that opens on the outer circumferential surface of the hole, a fluid injection path that communicates with the gap between the inner tube and the outer tube and the inside of the enlarged part body, and opens in the enlarged part body; It serves as a storage part for the wing, and expands and contracts by expanding and contracting the jack to move the head tube, inner tube, and rack gear up and down together, and by rotating the worm wheel via the pinion gear, bevel gear, and rod gear. The hole-expanding wing protrudes almost perpendicularly to the axis of the hole-expanding section main body, and is configured so that it can be stored in the storage section of the hole-expanding section main body with about half of the hole-expanding wing exposed from the tip of the main body. , A hole-drilling device used for ground improvement, etc.