JPH0623447B2 - Pile head processing bucket device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is intended to easily remove poor quality overfill concrete containing mud accumulated at the head of a pile hole during concrete placing of reinforced concrete cast-in-place pile. The present invention relates to a pile head processing bucket device.

[Conventional technology]

In the cast-in-place concrete pile method, in order to prevent the collapse of the hole wall, a stable solution such as bentonite solution is filled into the hole for drilling, and after inserting the rebar cage into the hole, concrete is poured through the tremie pipe. A pile is constructed by placing it and replacing it with the stabilizing solution in the hole. Since the heads of the constructed piles become brittle due to slime and stabilizing liquid being mixed during concrete pouring, generally, a method of scraping off the pile heads with a breaker for about 50 cm to 1 m after the concrete hardens. Is taking.

[Problems to be Solved by the Invention]

Scavenging work using a breaker not only causes noise, vibration, and dust to deteriorate the working environment, but also has a large impact on the neighborhood, and there are major problems in terms of construction cost and construction period.

Therefore, in addition to the method using a breaker as a method of removing such pile heads, 1) Immediately after placing concrete, a fluid such as water, stabilizing liquid, or air is injected at high pressure into the surplus concrete to Method to stir the surplus concrete and separate it into gravel, sand, and cement to form extremely brittle pile heads to facilitate picking work.

2) A method of cracking the pile head with a static crushing agent and breaking the surplus concrete into small pieces.

3) There is a method to remove excess concrete inside the reinforced basket with a bucket and scrape the wall-shaped excess concrete left around the reinforced basket with a breaker.

However, the method of 1) above requires a large-scale device and may even mix and separate sound concrete in the pile body. Further, a stabilizing solution such as a bentonite solution is agitated with the concrete, so that it gelates and the stabilizing solution must be discarded.

In the method of 2) above, cracks may occur even in the concrete of the pile main body, and the cracked pile head must be further broken into small pieces with a breaker, which eventually requires scavenging work.

In the method of 3) above, after pulling out the bucket, in order to leave the extra concrete around the rebar cage in a wall shape, the extra concrete must be hardened halfway, and after the concrete pouring, It takes at least 2 to 3 hours to pull out. In addition, the surplus concrete left around the reinforced steel baskets on the pile heads must be removed with a breaker.

There are drawbacks such as.

[Means for Solving the Problems]

The present invention has been made to achieve the above object, and includes a shutter for opening and closing an opening provided in a bottom plate for taking in extra concrete, a bucket body having a roller for guiding the shutter, and a bucket. It consists of a hoisting jig equipped with a wire hoisting device for hanging, and connects both ends of the shutter and the hoisting device with wire ropes, and drives the hoisting device to move the shutter to open and close the opening. What is done is summarized.

[Work]

Muddy water is accumulated in the pile holes, and when using the bucket, the inside and outside of the device become dirty with this muddy water, which causes the device to malfunction.
In the present invention, since the other drive mechanism is arranged above the bucket only by the roller, shutter, and rope in the bucket, the possibility of failure is reduced, and further, the air hose and the power cable from the ground to the drive device in the bucket. No need to connect.

〔Example〕

 The present invention will be described below with reference to the illustrated embodiments.

In the figure, 1 is a pile hole having a required diameter and depth excavated by using a casing K, and a pile head treatment bucket 2 for removing surplus concrete containing unhardened mud in this pile hole 1 Insert. The bucket 2 has a diameter that allows it to be inserted into the casing K, and has an opening 3 formed in its lower end surface. Guide rollers 4 and 4 are arranged on both sides of the opening 3 so as to face the inside of the bucket. A shutter 5 that opens and closes the opening 3 by being guided by the rollers 4 and 4 is provided.

The shutter 5 has at least a width and a length for completely closing the opening 3, and is made bendable by being guided by a guide roller. Wires 6 and 6 for opening and closing are provided at both ends in the direction of opening and closing the opening 3. Connect the wires 6 and 6 to the second
As shown in the figure, make the wire 6
And the wire 8 for hanging, which is guided by the wire guide stopper 7 of the bucket 2, are connected to each other, and a stopper 9 is provided at the connecting position of the both wires 6 and 8 to regulate the movement amount of the shutter 5. Eggplant

14 is a tremie pipe guide provided on the inner peripheral surface of the bucket 2, 10
Is a bag-shaped packing provided on the outer peripheral surface on the lower end side of the bucket, by closing the gap between the casing and the bucket by sending air into the packing 10, the bucket is stabilized, and muddy water, surplus concrete, etc. are the casing, Prevents outflow from the gap between buckets to above the pile. The upper end of the wire 8 is locked to a hoisting device 12 (for example, a chain block, a chill climber or the like) provided on the hanging jig 11, and the hoisting device 12 is driven to open and close the shutter 5.

The lower end of the wire 13 for suspending the bucket is locked to the upper end of the bucket 2, the upper end of the wire 13 is locked to the hanging jig 11, and the hanging jig 11 is hung by a crane or the like.
The bucket 2 is moved up and down in the pile hole via the 13.

Next, the use of the pile head processing bucket device configured as described above will be described.

The bucket main body 2 is fixed to a reinforcing bar cage preassembled on the ground as a reinforcing bar for the pile, and the reinforcing bar cage is inserted into the pile hole together with the bucket main body. A rubber tube bag-shaped packing 10 is attached to the outer periphery of the bucket 2, and compressed air is sent into the packing 10 to inflate the packing 10 to reinforce the rebar cage and the pile hole wall (inner casing inner surface). Close the gap at the specified height.

Next, penetrating through the opening 3 in the bottom plate of the bucket, the tremie pipe is hung down, the tremie pipe is made to flow down, concrete is placed from the bottom of the pile hole, and the poor quality including mud pushed up by this concrete and moving upward. The surplus concrete is taken into the bucket through the opening at the bottom of the bucket.

After pouring concrete to the predetermined position in this way, the tremie pipe is removed, the lifting jig 11 is lifted above the bucket with a crane, and the other ends of the wires 6 and 8 extended upward from both ends of the shutter. This wire 8 is wound by driving the chill climber 12, and the shutter 5 is moved while being regulated by the guide roller 4 by driving the chill climber 12 to close the opening 3 at the bottom of the bucket. Then, the bucket is hoisted together with the hoisting jig through the wire 13 that connects the hoisting jig 11 and the bucket 2, and the shutter is opened at a predetermined position above the pile hole, for example, above the truck to remove excess concrete in the bucket. Discharge.

〔The invention's effect〕

According to the present invention, even if muddy water is accumulated in the pile hole in which the bucket is inserted, only the shutter and the wire for moving the shutter are arranged in the bucket, and the drive unit is located above the bucket. The possibility of failure is low, the reliability is improved, and the surplus concrete is stored and discharged in the bucket when it is not cured. Therefore, the upper end surface of the cast concrete is smooth and the height accuracy is good.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a pile head processing bucket device, FIG. 2 is a vertical sectional side view of the same, FIG. 3 is a plan view, and FIG. 4 is an overall schematic diagram. 1 is a pile hole, 2 is a bucket, 3 is an opening, 5 is a shutter,
6, 8 is a wire, 10 is a packing, 11 is a hoisting jig, 12 is a hoisting device, 13 is a hoisting jig and a bucket are connected, and when the hoisting jig is lifted, the bucket is removed from the pile puller similarly. Hanging wire.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akiyoshi Otobe 12-10 Katsuyama-cho, Nohara, Ohara Nohara, Nishikyo-ku, Kyoto City, Kyoto Prefecture

Claims (1)

[Claims] 1. A device for removing inferior quality surplus concrete containing mud accumulated in the head of a pile hole when placing reinforced concrete cast-in-place concrete, which is provided on a bottom plate for taking in surplus concrete. A shutter that opens and closes the opening, a bucket body that incorporates a roller that guides the shutter, and a lifting jig that includes a wire hoisting device for hanging the bucket. The pile head processing bucket device is characterized in that the opening is opened and closed by driving the hoisting device by moving the shutter.