JPS58113418A - Pile head treatment work - Google Patents

Abstract

PURPOSE:To lessen the part to be broken of the pile head as well as form its shape into an easily breakable shape by a method in which a bucket filled with granules, e.g., sand, etc., is hung down from the opening of a pile and removed when concrete is being hardened. CONSTITUTION:After inserting an iron bar cage 10 into the hole 9 of a pile, the hooks 6 and 6' of a bucket 1 are hooked on the upper end of the iron bar cage 10, the bucket 1 is hung down from the upper end opening of the pile hole 9, and granules, e.g., sand or gravel, etc., are packed into the bucket 1. Then, concrete 12 is placed through a tremie tube, etc., into the pile hole 9, whereupon slime generated from the bottom of the pile hole 9 is pushed up along the peripheral side of a conical tray 5 on the bottom of the bucket 1 and collected. Thus, the part to be broken of the pile head 13a containing brittle slime can be lessened and the pile head 13a can be shaped into an easily breakable form.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head treatment method for piles constructed on site, so-called cast-in-place piles.

With cast-in-place piles, the slime generated at the bottom of the excavation hole rises to the top when concrete, etc. is placed, and the head of the pile, which is formed when the concrete hardens, becomes a weak part with the slime mixed in, so this part is destroyed. It is necessary to remove it.

Such pile cap processing work involves manually grinding, crushing, or scraping the pile cap, but in either case, the entire pile cap must be processed, which takes time and effort. It was a hassle to spend.

It is an object of the present invention to provide a pile cap processing method that eliminates the above-mentioned disadvantages and allows for simple and quick work since the number of parts to be destroyed is small and the shape is easy to destroy.

However, according to the present invention, the purpose of the lever is to suspend a packet filled with granular material such as sand or gravel below the pile hole opening when concrete or the like is poured into an excavated hole, and to suspend the concrete, etc. This is accomplished by removing the packets during hardening to form a hole in the center of the pile cap, and then destroying the pile cap.

Embodiments of the present invention will be described in detail below with reference to the drawings.

First, the packet used in the present invention will be explained first. As shown in FIG. It has a length of about 1 to 1.5 m, and a hook 6.6' for hanging is attached to the upper opening edge of the body 2. Install it so that it sticks out.

In the figure, 7 is a granular material such as sand or gravel to be filled into the packet 1.

Next, to explain the procedure of the construction method of the present invention, FIGS. 2 to 7 are longitudinal sectional front views showing examples of the construction method of the present invention. First, as shown in FIG. 2, the ground is excavated using an excavator 8. Pile hole 9
form.

Next, the reinforcing bar front 1o is inserted into the pile hole 9, and when the reinforcing bar front 1o has been inserted, hooks 6 and 6' of the packet 1 are hooked onto the upper end of the reinforcing bar front IO. is suspended below the upper end opening of the pile hole 9, and the packet 1 is filled with granular material 7 such as sand or gravel. (Fig. 6) The above-mentioned granular material 7 may be filled in advance before hanging the packet 1, or the packet 1 may be suspended at a point 1 in front of the reinforcing bar before being inserted. It may be inserted into the pile hole 9 along with the angle.

After setting in this way, when concrete 12 is cast into the pile hole 9 using, for example, a tremie pipe 11 as shown in FIG. 4, the slime generated from the bottom of the pile hole 9 is removed by conc. 12, and rises to the upper part 12α of the concrete 12.

When the upper part 12α of the concrete 12 mixed with such slime approaches the opening of the pile hole 9, it reaches the nogkent 1 as shown in FIG. 5, and is further located in the gap between this packet 1 and the pile hole 9. . .

Since the bottom part 4 of the packet 1 is provided with a conical steel surface 5, the upper shield of the concrete plate 12 extends along the outer circumferential surface that slopes upward from the tip protrusion of the plate 5 to the body of the packet l. 2, the slime-containing portion of the concrete 12 can be efficiently collected without spreading.

Moreover, since there is the weight of the steel surface 5 and the weight of the granules 7 added thereto, the packet l will not be lifted up by the rising concrete 12.

When the packet 1 is removed after the concrete 12 has hardened, the pile cap of the concrete pile 13 ]3α as shown in FIG.
A hole 14 having the outer shape of the packet 1 is formed in the center downward from the top surface, and the portion containing impurities such as slime is limited to the outside of the hole I4.

Therefore, as shown in Fig. 7, the ground around the pile 3 was excavated so that the bottom of the hole 14 was also located downward, and the ground was ground around the pile 3 by manual grinding or using a simple breaking machine 15 such as a breaker. Break the concrete in the area mixed with slime etc. until the bottom of the hole 14 is exposed, and in this way
The upper reinforcing bars are exposed and used for connection with the upper structure.

In addition, since the bottom part 4 of the packet 1 is not flat as described above but has a tapered surface, the slime-containing part will not come to this part.

As described above, the pile cap treatment method of the present invention involves suspending a packet filled with granular materials such as sand or gravel below the opening of the pile hole when placing concrete or the like in an excavated hole. When the above-mentioned concrete etc. hardens, the packet is removed and a hole is formed in the center of the pile head, and then the pile head is destroyed, so it is easy to destroy the head of the pile that has impurities such as slime mixed in. Moreover, it can be carried out quickly, does not require the troublesome work of assembling formwork, and can be carried out at a low construction cost using extremely inexpensive materials such as packets, sand, and gravel.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the packet used in the construction method of the present invention, Figure 2
7 to 7 are longitudinal sectional front views showing the procedure of an embodiment of the construction method of the present invention. 1... Packet 2... Body 3...
...Flexible material 4...Bottom part 5...
...Steel surface 6,6'...Hook 7...
...Particles 8...Excavator 9...
...Pile hole 10...In front of reinforcing bar ■1...
...Tremy pipe I2 ... Concrete 12α ... Upper part 13 ... Concrete pile 13α ... Pile cap 14 ... Hole 1
5... Destruction machine applicant Sanwa Kizai Co., Ltd. Figure 1 Fang 2 Fig. Fang 3 Fig. Fang 4

Claims (1)

[Claims] When pouring concrete into an excavated hole, a packet filled with granular material such as sand or gravel is suspended below the opening of the pile hole, and when the concrete hardens, the packet is removed and the center of the bed is placed. A pile cap processing method characterized by forming a hole in the pile and then destroying the pile cap.