JP2778847B2 - Pile head processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a pile head treatment device for removing a portion of a concrete pile having a reduced strength due to concrete impurities formed at the pile head when the concrete pile is constructed underground.

[0002]

2. Description of the Related Art To construct a concrete pile underground,
Usually, it is as follows.

[0003] That is, the ground is excavated, then the casing is excavated and buried, then a reinforcing bar is installed in the casing, and then concrete is poured into the casing so as to bury the reinforcing bar. Thereafter, the casing is pulled out, and the concrete is solidified and cured.

When the concrete is solidified and cured,
At the pile head of the concrete pile (at a position several tens of centimeters lower than the ground surface level), a reduced strength portion due to concrete impurities is generated. The pile head is removed until a strength level of?

However, conventionally, the work of removing the pile head of the concrete pile relies on manual labor. In other words, many workers performed level measurement (inking) to determine the height of the pile head to be removed, crushing the pile head with a breaker, and removing concrete adhering to the rebar, etc. These operations are not only dangerous, difficult, and dirty, but also cause noise pollution.

Therefore, using water jet technology,
It is conceivable to remove the pile head without manual intervention.

[0007]

However, the water jet technique has a limited cutting ability and has a diameter of 1 mm.
It is very difficult to break a pile head of a concrete pile exceeding a meter from its outer periphery. Further, even if it becomes possible to crush the pile head from the outer periphery, it is extremely difficult to crush the pile head without damaging the reinforcing steel buried in the concrete pile.

Accordingly, an object of the present invention is to provide a pile head capable of crushing and removing a pile head of a concrete pile using a water jet technique so as not to cut a reinforcing bar buried in the concrete pile. An object of the present invention is to provide a processing method and a pile head processing device.

[0009]

In order to achieve the above object, the present invention relates to a method for constructing a concrete pile in the ground by casting concrete, the concrete impurity formed on the pile head of the concrete pile. In the pile head treatment for removing the concrete pile, before solidifying the concrete for constructing the concrete pile, a plurality of preceding rods forming a nozzle insertion hole in a portion to be a pile head of the concrete pile, A pushing member for pushing into the portion, a nozzle insertion hole treatment device having a roller for raising and lowering the pushing member in the casing, and after the concrete of the concrete pile is solidified,
A plurality of water jet nozzles for crushing and removing the pile head of the concrete pile in the nozzle insertion hole, a drive mechanism for rotating and lowering each of the water jet nozzles into the nozzle insertion hole, and the water A pile head processing apparatus comprising: a moving table that supports a jet nozzle and the driving mechanism; and a pile head removing device that includes a frame having a key that guides the moving table to move downward and upward. Is provided.

[0010]

[0011]

According to the present invention, before the concrete of the concrete pile is solidified, a plurality of nozzle insertion holes are formed in advance in the portion to be the pile head of the concrete pile, and after the concrete is solidified, each water jet nozzle is formed. Is lowered into the nozzle insertion hole while being rotated, so that the wall between the nozzle insertion holes can be cut from the inside of the nozzle insertion hole to break the pile head. By adjusting the pressure, flow rate, and the like of the pressure fluid discharged from the water jet nozzle when crushing the pile head, it is possible to prevent the reinforcing bars buried in the concrete pile from being damaged.

[0012]

An embodiment of the present invention will be described below.

First, an embodiment of a pile head treatment apparatus according to the present invention will be described with reference to the drawings.

FIGS. 1 to 4 show an embodiment of a pile head treatment apparatus according to the present invention. FIG. 1 is a partially omitted sectional view showing a nozzle insertion hole treatment apparatus, and FIG. 2 is a pile head removal apparatus. 3 is a partially omitted cross-sectional view of the device, FIG. 3 is a partially omitted plan view of the pile head removing device shown in FIG. 2 excluding the gantry, etc., and FIG. FIG. 4 is a partially omitted plan view similar to FIG. 3 except for a gear mechanism and the like.

(Overview of Pile Head Processing Apparatus Overall) The pile head processing apparatus of the present embodiment has a pile head 1a (see FIG. 1) of the concrete pile 1 before solidifying concrete for constructing the concrete pile 1.
And a plurality of leading rods 11 that form the nozzle insertion hole 2 in a portion serving as a part 1a.
And a plurality of crushers for crushing the pile head 1a in the nozzle insertion hole 2 after the concrete of the concrete pile 1 is solidified. Pile head removal comprising: a plurality of water jet nozzles 21; a drive mechanism 22 for rotating the plurality of water jet nozzles 21 to descend into the nozzle insertion holes 2; and a gantry 23 supporting the drive mechanism 22. Device 20 (see FIG. 2), the device does not increase in size, and the pile head 1a
Can be efficiently crushed and removed. Less than,
Each component will be described in detail.

(Part of the Nozzle Inserting Hole Processing Apparatus 10) As shown in FIG. 1, the pushing member 12 of the nozzle inserting hole processing apparatus 10 is formed of a column-shaped weight, and is used when the concrete pile 1 is constructed. A roller 14 is provided on the outer peripheral surface of the casing 4 to be hung through a hanging member 13 before the casing 4 is pulled up, and a roller 14 is provided between the outer peripheral surface and the inner peripheral surface of the casing 4. Are kept constant and the inside of the casing 4 can be raised and lowered smoothly.

The leading rod 11 is provided with the pushing member 12
Are arranged at appropriate intervals in the peripheral portion of the bottom surface of. Here, the interval between the nozzle insertion holes 2 according to the interval between the preceding rods 11, that is, the nozzle insertion holes 2
The thickness of the wall in between is set. Therefore, the number of the preceding rods 11 and the interval thereof are set so that the wall having a thickness that can be cut by the water jet nozzle 21 is obtained.

At the lower end of the casing 4, a tubing cutter 4a is provided. A hanging member 4b is attached to the upper end of the casing 4.

(Pile Head Removal Device 20) The pedestal 23 of the pile head removal device 20 is substantially cylindrical and has a support base 23a provided at the upper end thereof. As shown in FIG. It is mounted on the pile head 1a after the concrete has solidified. In addition, a movement supporting the water jet nozzle 21 and the drive mechanism 22 is provided on an inner surface inside the gantry 23 (an inner surface of a space between the support base 23a and the upper end of the pile head 1a). A pair of keys 23b for guiding the table 24 to be able to move up and down is provided.
A female screw 2 into which a feed screw rod 22a of the drive mechanism 22 is screwed is provided at the center of the support base 23a of the gantry 23.
3 c is provided, and a hole 23 d is provided in a peripheral portion thereof so that an introduction pipe 25 for sending pressurized water or the like to the water jet nozzle 21 is protruded and retracted as the movable table 24 moves up and down.

The driving mechanism 22 of the pile head removing device 20 includes:
As shown in FIG. 2, the feed screw rod 22a, a driving device 22b for driving the feed screw rod 22a and the water jet nozzle 21 to rotate, and the rotation of the drive device 22b are controlled by the feed screw rod 22a and the water. And a gear mechanism 22c (see FIG. 3) for transmitting the jet to the jet nozzle 21.

The feed screw rod 22a is erected at the center of the moving table 24 via a bearing 22d so as to be immovable in the axial direction and rotatable around the axis.

The driving device 22b includes an electric motor 22
b ₁ , a speed reduction mechanism 22 b _{2, and the} like, and are arranged on a support plate 24 b provided on the moving table 24 via a support 24 a. Output shaft 22b ₃ (see FIGS. 3 and 4) of the drive motor 22b, the gear 22c ₁ constituting the gear mechanism 22c is fixed.

The gear mechanism 22c includes the gear 22c _1.
When the feed screw rod 22a gear 22c ₂ and gear 22c ₃ is fixed to the plurality of (five in FIG. 3) that is screwed to the water jet is fixed to the upper end of the nozzle 21 and the gear 22c ₃ gear 22c ₄ When the intermediate gear 22c ₅ (FIG. 4 which is arranged between the gear 22c ₁ and the gear 22c ₂
Reference).

The gear 22c ₁ is connected to the intermediate gear 22c ₅
Is screwed to the one of the gear 22c ₂ which is fixed to the feed screw rod 22a through a (see FIG. 4). Therefore, when the drive motor 22b is driven, the gear 22c _1, the gear 22c _5, rotating the feed screw rod 22a through the gear 22c ₂ is transmitted, said transmission Ri threaded rod 22a is rotated, said transmission Ri threaded rod Since 22a is screwed with the female screw 23c, it moves up and down while rotating, whereby the movable table 24 moves up and down. Further, the by rotation of the feed screw rod 22a, the rotation is transmitted to the each gear 22c ₄ from the other gear 22c ₃ which is fixed to said transmission Ri threaded rod 22a, the water jet nozzle that is fixed to the gear 22c ₄ 21 rotates.

The water jet nozzle 21 is rotatably supported by the moving table 24 via a bearing 26a and a seal 26b. The water jet nozzle 21 rotates in the nozzle insertion hole 2 by the rotation of the feed screw rod 22a. The nozzle 21a is provided at the lower end thereof.

The lower end of the introduction tube 25 is inserted into the movable table 24 via a seal 25a. As shown in FIG. 4, hydraulic passages 25 b and 25 c for sending pressurized fluid from the introduction pipe 25 to each of the water jet nozzles 21 are provided inside the movable table 24.

The introduction pipe 25 is connected to a hydraulic pressure generator (not shown) via an introduction joint 25d.

Next, an embodiment of the pile head processing method of the present invention will be described.

The pile head processing method of the present embodiment is performed using the nozzle insertion hole processing apparatus 10 and the pile head removal apparatus 20. After the concrete for constructing the concrete pile 1 is cast, Before the concrete is solidified, a nozzle insertion hole processing step of forming a plurality of nozzle insertion holes 2 in a portion to be the pile head 1a of the concrete pile 1, and after the concrete of the concrete pile 1 is solidified, The water jet nozzle 21 is lowered into the respective nozzle insertion holes 2 while rotating the water jet nozzle 21.
Pile head 1 of concrete pile 1 by pressurized fluid from
and a pile head removing step of crushing and removing a.

First, the nozzle insertion hole processing step will be described in detail with reference to FIG.

When constructing the concrete pile 1, the casing 4 is pulled out according to the amount of the concrete while the concrete is being poured. At the final stage, the weight 12 is lowered into the casing 4 by the hanging tool 13. The weight 12
Due to the weight of the above, the leading rod 11 is pushed into the portion to be the pile head 1a before the concrete is solidified, and a plurality of nozzle insertion holes 2 are formed.

By previously forming the nozzle insertion holes 2 in this manner, the pile head 1a can be crushed using the water jet nozzle 21. Nozzle insertion hole 2
Is set so that a wall that can be cut by the water jet nozzle 21 is obtained as described above.

Instead of using the weight 12, the leading rod 11 may be pushed in by a hydraulic cylinder or the like.

Next, the pile head removing step will be described in detail with reference to FIG.

After the casing 4 is pulled out from the pile head 1a and the concrete of the pile head 1a is solidified,
3 is installed on the pile head 1a. Next, the driving device 22 is operated to rotate the feed screw rod 22a to lower the water jet nozzles 21 into the nozzle insertion holes 2 while rotating the respective water jet nozzles 21.
, A pressurized fluid from a hydraulic pressure generator is supplied through an introduction joint 25d, an introduction pipe 25, and hydraulic pressure passages 25b and 25c, and the pressurized fluid is supplied from a nozzle 21a at a lower end of the water jet nozzle 21 to the A jet is injected toward the inner wall of the nozzle insertion hole 2 to cut the wall between the nozzle insertion holes 2 to crush the concrete of the pile head 1a. At this time, the nozzle 2
By adjusting the pressure, flow rate, and the like of the pressurized fluid injected from 1a, the concrete adhering to the reinforcing bar 3 can be removed without damaging the reinforcing bar 3.

The rotation of the screw rod 22a and the rotation of the water jet nozzle 21 do not necessarily have to be linked with each other, but may be rotated by individual driving machines. In addition, the driving device may be driven not only electrically but also hydraulically.

As described above, according to the pile head processing method of the present embodiment, since the pile head 1a is removed by using the water jet technique without using any manual operation, it is possible to reduce the worker's risk and difficulty. , The work environment can be improved, and noise pollution can be reduced as much as possible.

It should be noted that the present invention is not limited to the one shown in the above-described embodiment. In short, a nozzle insertion hole is formed in advance, and the water jet nozzle is rotated and lowered into the nozzle insertion hole. Just do it.

[0039]

As described above, according to the present invention, it is possible to crush and remove a pile head of a concrete pile using water jet technology so as not to cut a reinforcing bar buried in the concrete pile. It is possible to improve the efficiency of the work of removing the pile head and improve the working environment by mechanization.

[Brief description of the drawings]

FIG. 1 is a partially omitted sectional view showing a nozzle insertion hole processing apparatus.

FIG. 2 is a partially omitted cross-sectional view of the pile head removing device.

FIG. 3 is a partially omitted plan view showing the pile head removing device shown in FIG. 2 excluding a gantry and the like.

4 is a partially omitted plan view similar to FIG. 3 and showing the pile head removing device shown in FIG. 2 in addition to a gantry and the like and further excluding a gear mechanism and the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete pile 1a Pile head 2 Nozzle insertion hole 3 Reinforcing bar 4 Casing 10 Nozzle insertion hole processing device 11 Leading rod 12 Push-in member (weight) 20 Pile head removal device 21 Water jet nozzle 22 Drive mechanism 22a Feed screw rod 22b Drive Machine 22c gear mechanism 23 mount 23a female screw

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 5/34

Claims (1)

(57) [Claims] In a pile head treatment for removing concrete impurities formed on a pile head of a concrete pile when casting concrete and constructing a concrete pile in the ground, concrete for constructing the concrete pile is provided. Prior to solidification of the concrete pile, a plurality of leading rods forming a nozzle insertion hole in a portion serving as a pile head of the concrete pile, a pushing member for pushing the leading rod into the portion, and a pushing member moving up and down in the casing A hole processing apparatus for nozzle insertion having a roller to be driven, and after the concrete of the concrete pile is solidified,
A plurality of water jet nozzles for crushing and removing the pile head of the concrete pile in the nozzle insertion hole, a drive mechanism for rotating and lowering each of the water jet nozzles into the nozzle insertion hole, and the water A pile head processing apparatus comprising: a moving table that supports a jet nozzle and the driving mechanism; and a pile head removing device that includes a frame having a key that guides the moving table to move downward and upward. .