JPS60223524A - Head treater for cast-in-place concrete pile - Google Patents

Abstract

PURPOSE:To prevent the occurrence of noise and vibration by a method in which a breaking pipe is set in the boundary between an upper concrete to be removed out and a lower concrete not to be removed and an expansible substance is packed into the pipe. CONSTITUTION:When the placing height of concrete reaches near a breaking pipe 7 on the way of placing concrete into the formwork 3, a rope 21 is pulled to move the pipe 7 to the boundary between an upper concrete 4 to be removed out after the placement of concrete and a lower concrete 5 not to be removed. Concrete is placed into the formwork 3, a ring 22 is projectionally set in the upper concrete 4, and tools 20 are removed. When the concrete hardens, the formwork 3 is removed out, and an expansible substance is packed into the pipe 7. The pipe 7 is expanded by the expansion of the substance to cause cracking in the boundary portion to break the concrete 4. The concrete 4 is removed out by using the ring 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pile head treatment device for cast-in-place concrete piles used in various structures.

In general, cast-in-place concrete piles are set at a height of 50 CI higher than a predetermined height in order to prevent floating objects with low specific gravity such as mud from rising after concrete placement and reducing the strength of the upper concrete section. After pouring concrete to a higher height, the excess upper concrete portion is removed. Conventionally, as a method for removing this upper concrete portion, a method of chipping off the upper concrete portion using a rock drill has been used.

However, such chiseling work using a rock drill generates significant noise, vibration, dust, etc., which is becoming a problem as pollution, and the conditions for workers are not favorable in terms of occupational safety and health, resulting in a large amount of damage. There is a problem in that it requires a lot of labor and costs a lot of money.

In view of the conventional problems, the present inventor has conducted extensive research and has completed a pile head processing device for cast concrete piles that solves the above-mentioned problems.

Hereinafter, one mode of implementation of the present invention will be explained with reference to the drawings.

In the drawing, (11) reinforcing bars form the framework of cast-in-place concrete.The reinforcing bars (11) extend in the vertical direction, and as shown in FIGS. Books are arranged.

(!) is a 7-p bar, which is wrapped in a band shape around the outer periphery of the ring-shaped reinforcing bars ftl, fl,... in order to make the reinforcing bars +1 vertical.

(3) is a formwork for forming cast-in-place concrete piles. The formwork [31ii] has a cylindrical shape and has a structure that can be assembled and disassembled as appropriate.

14) and (5) are the concrete parts placed in the formwork (3), respectively, where (4) is the upper concrete part that should be removed after concrete pouring, and (5) is the lower concrete part that is not removed. be.

(6) is a pile head processing device, which includes a destruction pipe (7),
The injection pipe (8), the exhaust pipe (9), the joint (lψ, (indigo l), the protection tube (Ill, adjustment jig..., for O destruction consisting of string υ, etc.) and the scolding tube (7) are made of expandable material. It is a container to be filled with an aqueous slurry, and is usually made of synthetic resin such as polyethylene or polyvinyl chloride, or in some cases, metal. (5) near the concrete surface at the boundary, and is fixed to the entire protective cylinder O1, which will be described later, with a wire or the like.

Since the destruction pipe (7) is buried in concrete, it has enough strength not to be crushed by the weight of the upper concrete part (4), and has a cross-sectional shape of an appropriate shape such as a circle or an oval: 4 It is said that Also, the destruction pipe (7)
As shown in FIG. 9 or FIG. The expansion action of (1) is designed to more effectively shear the concrete by concentrating stress on the fin (l'4).
It is preferable that the diameter of the towing rib (7) for destruction is 20 to 8 Off.

The injection pipe (8) is for injecting the slurry of K-expansive substance into the destruction pipe (7), and is erected on the joint (II K-shaped destruction) pipe (7) bent into a 4-shape. connected in a similar manner. The injection has t81 Fi!
As shown in Figure 8, attach the joint α1 to the joint α1.
1, and the connection part between the injection pipe (8) and the di-four ind (1 (2)) and the di-four ind (lψ
The connecting parts of the towing eve (7) (for destruction) are each provided with an O-ring to prevent muddy water from entering. In addition, a cap α as shown in FIG. 6 is attached to the upper end (8a) of the injection pipe (8), and the upper end (8a)
8a) to prevent muddy water from entering.

In addition, the exhaust pipe (9) is used to exhaust air so as not to blow air into the destruction pump pipe (7) when filling the aqueous slurry of an expandable substance. (8)
Similarly, it is connected to the breaking pipe (γ) in an upright manner from the jitzuinto (11) K, which is bent into a 4-shape.

The structure of the a-connection part is the same as that of the above-mentioned injection-pulling tube (8), as shown in FIG. Further, the upper end (9a) K of the exhaust pipe (@) is fitted with a cap as shown in FIG. 1 to prevent muddy water from entering from the upper end (9a).

In addition, the injection pipe (8) and the exhaust pipe (9)
are adapted to protrude upward from the upper concrete part (4), respectively. In addition, in FIG. 8, by adjusting the destruction pipe (71K insertion length L) of the connection part (10 m) of (II1) and (lla) as appropriate, the destruction pipe ( 7) has a structure in which the length can be adjusted. θη corresponds to the fin part θ of the destruction pipe (7). +101, (11
It is a fin protruding from the + surface.

(It is an IF4#-i protective tube, and is made of composite rL resin such as polyethylene and polyvinyl chloride, metal, etc.).

The film retaining tube haze has an appropriate cross-sectional shape with a diameter larger than the diameter of the reinforcing bars 11), and
)...K are loosely fitted over each other. In addition,(
The reinforcing ring is made of metal, synthetic resin, etc., and is fixed to each protective tube (InA wire 4IK) to unify the ends of the protective tubes.

(21#i adjustment jig, which is shaped like a long rod, has a cylindrical part (20b) at the lower end that is placed over the upper end of the reinforcing bar fl, and a hook part (20a) at the upper end. There is.

(2η is a string that is attached to the adjustment jig, and is attached to the protective tube (11) of the reinforcing bar fl to which the adjustment jig is attached.
One end of the upper end is fixed, and the other end is the adjustment jig.
- It is fixed to the lower end of the insurance tube holder via the gusset (2). That is, by pulling the string chest near the hook part (20a) of the adjustment jig, the breaking pipe (7)
, the injection pipe (8), the exhaust pipe (9), and the protection tube H can be moved up and down.

(2) is a hook for lifting up the upper concrete part (4) after destruction, and when the upper concrete part (4) is poured, the K
jl will be established.

Further, as the above-mentioned expandable material, what is generally called a cement expandable material, such as lime-based, dolomite-based, calcicumsal hexa-aluminate-based, is used. When this expandable substance is kneaded with water, it expands exothermically due to a hydration reaction.
Leister (trade name: manufactured by Onoda Cement), which exhibits a cI of 71 or more, is preferably used.

Next, a method for removing the upper concrete portion (4) using the pile head treatment device (6) described above will be described.

■ First, before pouring the concrete, cover each steel * fil K protective tube +11 and fix the upper end of the protective tube (119) to the reinforcing ring 4 with wire.

■ Fix the destruction pipe (7) with the injection pipe (8) and exhaust pipe (9) attached to the lower end of the protective tube with wire. At this time, the joint screams (10 causes the destruction pipe (
7) Adjust the length appropriately.

■ Adjustment jig to move the pile head processing device (6) up and down.
To attach the reinforcing bars (1) to multiple pieces, attach the string η to the protective tube (IIK) as shown in Figure 3.

■ While pouring concrete into the formwork (3), the height of concrete pouring was near the breaking pipe (7).
When this happens, pull the string Q sword attached to the adjustment jig to adjust the position of the breaking pipe (7) between the upper concrete part (4) that should be removed after concrete pouring and the lower concrete part (5) that will not be removed. Move it to the border.

■ Place concrete in the formwork (3) to form a cast-in-place concrete pile with an upper concrete P4), and insert a hook (3) into the upper concrete part (4) from the upper concrete part (4). Bury it so that it protrudes,
Remove the adjustment jig.

■ Once the concrete has hardened, remove the formwork (3), remove the cap (119, H), and pour the aqueous slurry of the expandable substance into the breaking pipe (7) from the pouring and pouring tube (8) into the exhaust pipe ( 9).Then, as shown in Fig. 4, the bursting pipe (7) expands due to the expansion pressure of the expandable substance, and from this K, the upper concrete part (4) and the lower concrete part ( 6) cracks occur at the boundary between the two and are destroyed.

■ Lift up the hook by appropriate means and remove the upper concrete part (4) (see Figure 5).

In addition, at this time, the reinforcing bar (1)...the protection tube...
Since it is covered, the upper concrete part (4) can be easily removed.

In the above embodiments, the breaking pipe (7) does not necessarily have to be in a continuous annular shape, but may be in a discontinuous annular shape as long as it can be filled with an aqueous slurry of an expandable substance.

As described in detail above, in the present invention, a breaking pipe is arranged at the boundary between the upper concrete part to be removed after concrete placement and the lower concrete part that is not to be removed, and the breaking pipe is filled with Km tensile material. Since the boundary portion is destroyed by the expansion pressure of the expandable material,
The upper concrete part can be easily separated from the lower concrete part without generating noise, vibration, dust, etc. Therefore, there is no problem in terms of occupational safety and health due to workers being busy, and the amount of labor required is reduced.

In addition, one end of the string is fixed to the upper end of the protective tube of the reinforcing bar with the m adjustment jig, and the other end is fixed to the lower end of the protective tube via the hook part of the upper end of the adjustment jig and the 7-pipe reinforcement in the lower concrete part. The position of the breaking pipe can be adjusted up and down by pulling the string, so when pouring concrete, the breaking pipe can be adjusted while taking into account the pressure of the concrete, the strength of the ground, and the condition of the reinforcing bars. can be moved into place,
It can be reliably destroyed at the designed boundary between the upper concrete part and the lower concrete part. In other words, if the rupture pipe is placed in a fixed position in advance, the height of the reinforcing bars will change due to factors such as the pressure of the concrete and the strength of the ground during concrete pouring, and the rupture pipe will be placed in the planned position and where it will rise. There is a problem in that concrete is placed in the opposite direction, making it impossible to destroy the concrete as designed.The present invention, as described above, solves this problem and allows concrete to be destroyed as designed.

Furthermore, since an expandable substance is used, there is no need for conventional mechanical equipment such as a rock drill, and the destruction work can be carried out simply by filling the destruction pipe with the expandable substance. can.

Furthermore, since the protective tube is loosely fitted over the reinforcing bars in the upper concrete section, the upper concrete section can be easily pulled out from the reinforcing bars when the upper concrete section is removed.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the installed state of the pile head processing device of the present invention before concrete placement, Fig. 2 is a partially cutaway front view of the same, and Fig. 3 shows the installed state of the lj1 adjustment jig. A partially broken front view, FIG. 4 is a front view showing a cast-in-place concrete pile destroyed by the pile head treatment device of the present invention, and FIG. 5 is a front view showing the cast-in-place concrete pile with the upper concrete portion removed. Figure 6 is a vertical sectional view of the cap attachment part of the injection pipe, Figure 7 is a vertical sectional view of the cap attachment part of the exhaust pipe, and Figure 8 is injection. A partially cutaway front view showing a state connected to a pipe, FIG. 9 is a sectional view showing one embodiment of the destruction pipe, and FIG. 10 is a cross section showing another embodiment of the destruction pipe. The diagram is: (1)...Reinforcement bar, (2)...Two-ply bar, (3)-...
Formwork, (4)... Upper concrete part, (5)...
Lower concrete part, +61-...Pile head processing equipment% (7
17・For destruction) Injection pipe, (8)... Injection pipe, (9
)...Exhaust pipe, (In, fil)...Joint, 01, +1? )...Fin part, +1@-・
・Protective tube, wire... #l! 1 jig, wrinkles... string. Patent Applicant Name: Building Block Resin Co., Ltd. DoE 71 Zuzai 2n 25 Prisoners! f71!1 28 f q prisoner lθ m l 7 Procedural amendment (voluntary) Indication of September λF date of 1982 Patent Application No. 79029 Name of person who operates a pile head processing device for cast concrete piles Relationship with Jujiru Patent Applicant Address (〒530) 2-4-4 Nishitenma, Kita-ku, Osaka-shi Phone Name 4, Amendment 5, Statement of Contents of Amendment, page 10, lines 3 and 4 However, in the above removal method, after concrete is placed, an aqueous slurry of an expansive substance is filled into the eve (7) for destruction.
Before pouring concrete, the breaking pipe (7) may be filled with an aqueous slurry of an expandable substance in advance, and the expandable substance may be expanded after the concrete has hardened.

Claims (1)

[Claims] 1) When forming cast-in-place piles, a rupturing pipe filled with an expandable substance is arranged in an almost annular shape near the boundary between the upper concrete part that should be removed after concrete placement and the lower concrete part that will not be removed. The injection pipe and the exhaust pipe are connected to both ends of the destruction pipe in an upright manner from the dicoin (K), and when each vertical reinforcing bar in the upper concrete section is covered with a protective tube, the KD retention tube is formed. A long adjustment jig is attached to a plurality of the reinforcing bars in an upright manner, and one end of the string is fixed to the upper end of the protective tube of the reinforcing bar having the adjustment jig, and the other A cast-in-place concrete pile whose end is fixed to the lower end of the protection cylinder via the hook part at the upper end of the adjustment jig and the hoop reinforcement at the lower concrete part, and the position of the breaking pipe can be adjusted up and down by pulling the string. pile head processing equipment.