JPS6132454B2 - - Google Patents

Description

[Detailed Description of the Invention] Generally, tremie pipes are used when pouring underwater concrete, but as the depth of pouring increases, slime accumulates at the bottom, impeding the adhesion between the bottom ground and the concrete pouring surface. It will be done. Furthermore, if air bubbles are present in concrete, its strength will decrease and its adhesion to reinforcing bars will decrease. Furthermore, when concrete is continuously poured into the tremie pipe, clogging occurs within the pipe, resulting in unbalanced hardening at concrete joints. Furthermore, in the case of cast-in-place concrete piles, there are drawbacks such as reinforcing bars coming up together when the casing is pulled out.

The present invention was proposed in order to eliminate such drawbacks, and includes an air-type vibrator for concrete vibration compaction built into the tip of a tremie pipe for concrete pouring, and an air exhaust port for operating the vibrator. is arranged so as to be directed upwardly inside the tremie tube, and the slime at the bottom is floated and removed by the vibration of the vibrator and the air lift action of the exhaust from the exhaust port. This relates to concrete compaction equipment.

In the present invention, as described above, an air vibrator is installed at the tip of the tremie tube, and the air outlet for operating the vibrator is arranged to face upward inside the tremie tube. Therefore, like a cast-in-place concrete pile, a reinforcing bar cage is erected in a hard hole drilled in the ground, the tremie pipe is inserted, and an air vibrator installed at the tip of the tremie pipe is driven by air. Then, due to the vibration of the vibrator, the slime that has settled at the bottom of the hole floats, and at the same time, the operating air of the vibrator is discharged from the exhaust port toward the upper part of the tremie tube and rises inside the tube. Due to the air lift effect,
The slime is discharged to the ground through the tremie tube.

Furthermore, the poured concrete is compacted by the vibration of the vibrator, and air bubbles in the poured concrete are floated up and removed as the air vibrator exhausts air.

Therefore, by using the device of the invention,
The poured concrete surface is tightly anchored to the bottom of the shaft,
Densely compacted concrete will be placed.

Thus, when concrete is continued to be poured into the pit and vibration is applied by the air vibrator, the hardening time of the poured concrete that has already begun to harden is extended, and the concrete is evenly poured at the joints. Homogeneous concrete will be poured.

Thus, according to the device of the present invention, the concrete is poured after the concrete is poured after removing the slime in the hard hole, thereby bringing the bottom of the hole into close contact with the surface of the poured concrete. At the same time, the poured concrete is tightly compacted, the adhesion force between the concrete and the reinforcing bars increases, and sideways slipping and co-upward movement of the reinforcing bar cage when the tremie pipe is moved or the casing is pulled out is prevented.

The illustrated embodiment in which the present invention is applied to the construction of cast-in-place concrete piles will be described below.

Reference numeral 1 denotes a tremie tube, and an air vibrator 3 is installed at each predetermined position in an annular cavity 2 provided on the outer periphery of the distal end thereof, and is firmly fixed at the corresponding position by a mounting bracket 4.

In the figure, reference numeral 5 denotes an air hose connected to the vibrator 3, which is connected to a compressor 6 on the ground, which is a power source for the vibrating device. Reference numeral 7 denotes an on-off valve that is interposed in the operating air supply path to the vibrator 3 through the air hose 5, and is opened and closed via a cap tire cord 9 connected to a power supply device 8 on the ground, and the on-off valve 7 is opened. When this is done, the exhaust air from the air vibrator 3 is discharged from an exhaust port 10 provided at the tip of the tremie tube 1 and opening upward into the tube. In addition, the air hose 5 has a check valve 11.
is interposed.

After a pit A is excavated underground using an excavator, a reinforcing bar cage B is built into the pit A, and then a tremie pipe 1 is inserted.

Next, slime C has settled at the bottom of pit A.
In order to remove the slime C, air is sent from the air compressor 6 to the air vibrator 3 through the air hose 5, and the vibration of the vibrator 3 removes the slime C.
make it float. By opening the air on-off valve 7, the exhaust gas from the vibrator 3 is discharged obliquely upward into the tremie tube 1 through the exhaust hole 10, and due to the air lift action, the slime C is tremie-shaped. It rises inside the pipe 1 and is removed to the ground.

After the removal of the slime C is thus completed, when the air on-off valve 7 is closed, the exhaust air from the air vibrator 3 automatically pushes open the check valve 11 and is discharged into the pit A, causing it to float. There is.

When the removal of slime C is completed as described above,
When concrete D is poured into the pit A through the tremie pipe, the poured concrete C is vibrated by the air vibrator 3, and the air bubbles in the concrete D are floated upwards and removed. It is anchored tightly to the base and solid concrete is poured.

In this way, when the concrete D is successively poured into the shaft A and vibration is applied by the air vibrator 3, the hardening time of the poured concrete D, which has already begun to harden, is extended, and the concrete is hardened at the joints. A uniform and homogeneous concrete D is poured at the step.

Thus, if the slime C that has settled at the bottom of the pit A is removed before the concrete D is poured, the concrete D will be tightly anchored to the supporting ground at the bottom of the pit A. Arrived,
In the case of cast-in-place concrete piles, the supporting capacity increases, and since the poured concrete D is tightly compacted by vibration, the adhesion force with the reinforcing bar cage B increases, preventing movement of the tremie pipe 1 and pulling out of the casing. This prevents the reinforcing bars from sliding sideways or collapsing at the same time.

Thus, according to the present invention, the slime C can be removed by using the exhaust air of the air vibrator 3 without requiring any special equipment.
In addition, due to the vibration action of the air vibrator 3, air bubbles in the poured concrete D are effectively eliminated.
High-density concrete D that has been compacted is placed, and cast-in-place concrete piles with a large bearing capacity that are tightly anchored to the supporting ground are installed.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and may be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal sectional views showing the construction process of cast-in-place reinforced concrete piles using an embodiment of the concrete compaction device according to the present invention, and Figure 3 is a cross-sectional plan view of the tip of a tremie pipe. It is. 1...Tremy tube, 3...Air vibrator, 10...Exhaust port.

Claims (1)

[Claims] 1. An air-type vibrator for vibration compaction of concrete is installed at the tip of a tremie pipe for concrete placement, and an air exhaust port for operating the vibrator is arranged so as to face upward inside the tremie pipe, and the above-mentioned A concrete compaction device characterized in that it is configured to float and remove slime at the bottom by vibration of a vibrator and air lift action of exhaust from an exhaust port.