JPS5945065B2 - Temporary concrete crushing agent filling hole construction method - Google Patents

Description

[Detailed description of the invention] The present invention maintains a state in which a cylindrical sand bag is inserted into a standpipe with a cap detachably held at the lower end, and press-fits the sand bag into fresh concrete before hardening through the cap. The process of pulling only the standpipe upwards after press-fitting and separating it to form a cylindrical sand bag column inside the fresh concrete, and the process of removing the sand inside the sand bag column from the outside of the concrete after the concrete hardens. This method is related to the construction method of temporary concrete crushing agent filling hole, which consists of the entire process of making the sand bag column into a hollow hole by suctioning and ejecting it. The purpose is to crush holes for demolition of pile heads of bed piles used in concrete walls (concrete walls) and building foundations in a short time without generating vibration, noise, or dust.

To explain the embodiment of the present invention shown in the drawings, ready-mixed concrete 1 is cast to form bed piles 2, or ready-mixed concrete 1 is placed in the formwork of a jack reaction wall provided in a pit in the humid pipe propulsion method. to be poured.

Before this installation, stand pipe 3 made of metal or hardened synthetic resin, etc.
The upper surface fitting part 4' of the downward conical cap 4 is removably fitted to the lower end, and the wire 5 inserted through the through hole A drilled in the cap 4 is inserted into the through hole at the upper end of the standpipe 3. Hold the cap 4 at the lower end of the standpipe 3 by hanging it over the pin 6
The lower end of the cylindrical sand bag 7 inserted into the cap 4
hold it.

For the standpipe 3, the length can be adjusted by connecting the joint pipes 3', 3' with pins 8, 9, or a single pipe can be used.

The standpipe 3 inside the sand bag thus constructed is press-fitted from the cap 4 into the fresh concrete 1 before hardening.

When press-fitting, the lower part of the vibrator 10 is inserted or engaged with the wire connecting pin 6, and the vibrator 10 is operated to press down the vertical pipe 3, so that the standpipe 3 is quickly press-fitted into the fresh concrete 1 from the cap 4 to the required depth. .

After the press-fitting is stopped, cut the wire 5 with pliers to separate it from the pin 6, and separate the vibrator 10 together with the vibrator 10 from the pin 6, and pull only the standpipe 3 upward manually or with a wire rope, etc. to form ready-mixed concrete. When separated and removed from 1, wire 5 and cap 4
The sandbags 7 remain in the fresh concrete 1 to form sandbag pillars.

By such an operation, a plurality of sandbag pillars are formed before the homogeneous concrete 1 hardens (FIG. 7).

If left in this state, the concrete 1 will cure and harden.

The upper end of the sand bag 7 exposed on the upper surface of this hardened concrete is opened, the suction nozzle 11 is inserted into the sand bag 7, and the sand inside the sand bag 7 is suctioned and removed by the vacuum cleaner 12 to form a hollow hole 13. be able to.

In the figure, reference numeral 14 indicates a connecting pin insertion hole drilled in the connecting pipes 3', 3', 15 is a clay backing, 16 is a press-in depth standard rod, and 17 is a press-in depth indication level.

Therefore, after the concrete 1 has solidified and construction is completed, a static crushing agent 18 (trade name Plaister, manufactured by Onoda Cement) is filled into every other hollow hole 13, and when it is ignited, the crushing agent 18 produces no noise. , it expands strongly without vibration and without the generation of flying stones, dust, gas, etc. (3000 t/m") and generates the cracks 14 shown in FIGS. 11 and 12.

These cracks 14 allow the concrete 1 to be easily divided and removed.

Traditionally, when drilling holes for static crushing agent filling or other internal heating type crushing in solidified concrete, an air compressor, crawler drill, etc. is required, which generates noise, vibration, dust, etc., and the drilling process is difficult. It was a long-running dispute.

Since the present invention is based on the above-mentioned method, the crushing agent filling hole 13 is quickly formed in advance in the head of the bed pile to be discarded or crushed after civil engineering work, the reaction wall of the jack for propelling the humid pipe, etc., and the crushing agent filling hole 13 is quickly crushed. This not only shortens the construction period but also reduces equipment costs and does not generate noise, vibration, dust, etc., making it suitable for drilling in urban areas.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view of the device used in the temporary concrete crushing agent filling hole construction method of the present invention, Figs. Figure 5 is a side view of the standpipe being pulled upwards, Figure 6 is a side view of the construction equipment for one standpipe, Figure 7 is a side view of the sand bag column forming state, and Figure 8 is the sand suction state. A side view, FIG. 9 is a vertical side view of the static crushing agent filled state, FIG. 10 is a plan view of FIG. 9,
Figure 11 is a vertical cross-sectional side view of the state in which cracks have occurred, and Figure 12 is the first
FIG. 1 is a plan view of FIG. 4... Cap, 3... Standpipe, 7...
... Cylindrical sand bag, 1 ... Ready-mixed concrete,
13...Hollow hole, 4'...Fitting part, 5
・・・・・・Platform line.

Claims (1)

[Scope of Claims] 1. A cylindrical sand bag 7 is inserted into a standpipe 3 which has a cap 4 removably attached to its lower end, and is inserted from the cap 4 into the ready-mixed concrete 1 before hardening. A process of press-fitting, a process of pulling only the standpipe 3 upwards and separating it after press-fitting to form a cylindrical sand bag column in the fresh concrete 1, and a process of removing the sand in the sand bag column after the concrete 1 hardens. A temporary concrete crushing agent filling hole construction method comprising the entire process of forming the sand bag pillar into a hollow hole 13 by suctioning it to the outside of the concrete 1. 2. The method for constructing a temporary concrete crushing agent filling hole according to claim 1, wherein the cap 4 has an inverted conical shape and has a fitting portion 4' projecting from its upper surface. 3. A temporary concrete IJ-crushing agent filling hole construction method according to claim 1, in which the cap 4 is held at the lower end of the standpipe 3 by connecting the upper end of the standpipe 3 and the cap 4 with a wire 5. .