JPH0621964Y2 - Concrete pouring equipment for cast-in-place piles - Google Patents

Description

[Detailed Description of the Invention] (Industrial application field) The present invention relates to a concrete placing device for placing concrete into a pile hole when constructing a foundation pile in the ground in the ground silently and without vibration. It is a thing.

(Prior art) Conventionally, when concrete is placed on site and the pile is constructed without noise and vibration, if the soil quality is not good, the excavated soil is discharged with a bucket to prevent the hole wall from collapsing. In the hole,
After the bentonite is fed and filled, a reinforcing material is inserted, then concrete is put into the pile hole to replace the bentonite with the concrete, and then the concrete is hardened to construct a concrete pile.

(Problems to be solved by the invention) However, according to the conventional method, since it is replaced with bentonite, its specific gravity is large (about 1.2 to 1.5), and it is difficult to pour concrete. is there.

Further, in the conventional method, since the pile hole is filled with bentonite and then the bentonite is replaced with concrete, the discharge amount becomes twice the volume of the hole, and not only the number of construction steps increases but also the waste treatment process. There is a problem that it takes time and money. For this reason, there has been a demand for a means for forcibly inserting and replacing concrete in the mud as it is without replacing it with bentonite, but it has been difficult to forcibly insert concrete efficiently.

The present invention has as its basic purpose to solve the above problems, and provides a concrete press-fitting device that can easily and efficiently perform concrete pouring even if the specific gravity of the contents of the holes is high.

(Means for Solving the Problems) That is, the present invention is designed to be installed and fixed at the upper end of a pile hole, and the upper plate and the lower plate having through holes are connected by a vertical plate to provide a lateral position. A tubular cradle that is open, a through hole of the tubular cradle, a concrete feed pipe that is vertically movable and that is inserted so as to be locked in the rotational direction,
Inside the concrete inlet pipe, a spiral blade that is rotatably fitted is formed, and a ridge extending along the axial direction is formed on the concrete inlet pipe, and the ridge is formed on at least one of the upper plate and the lower plate. It is a concrete pouring device for cast-in-place piles, which is provided with a groove that can engage with.

(Operation) According to this invention, concrete is fed into the concrete feed pipe, and the spiral blade is rotated in the direction opposite to the spiral direction in the concrete feed pipe, whereby the concrete moves downward in the concrete feed pipe. Pumped. At this time, since the concrete inlet pipe is locked to the tubular pedestal in the rotation direction, the concrete inlet pipe does not rotate due to the rotation of the spiral blade, and the concrete is efficiently fed. Therefore, the concrete is pressed into the pile hole from the lower end of the concrete inlet pipe.

Further, by sequentially raising the concrete inlet pipe, concrete is sequentially fed from the lower part of the pile hole to replace the remaining excavated earth and sand, and the residual excavated earth and sand is discharged outside the pile hole where it is muttered.

It should be noted that concrete is press-fitted into the pile hole, and finally concrete is cured in a state where the concrete feed pipe and the spiral blade are extracted from the pile hole, whereby a concrete pile having a reinforcing material is constructed. It will be.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

The concrete inlet pipe 1 is made of a long cylindrical body and has a flange 1a formed at the upper end. Further, ribs (protrusions) 2 and 2 are formed on the outer peripheral surface in a diametrically symmetrical manner along the axial direction (FIGS. 3 and 4).

Further, the cylindrical pedestal 3 to be fixed to the upper end of the pile hole is the upper plate 3a.
The lower plate 3b and the lower plate 3b are connected by a plurality of vertical plates 3c, and are laterally open. The upper plate 3a is formed with a through hole 4a through which the concrete inlet pipe 1 penetrates, and slits (grooves) 5 and 5 through which the ribs 2 and 2 respectively pass are opposed to the through hole 4a. It is provided in the position. Further, the lower plate 3b is formed with a through hole 4b having a diameter larger than the distance between the outer ends of the slits 5 and 5 (FIGS. 1 and 2).

Further, in the concrete inlet pipe 1, a rotary shaft 6a is provided.
A spiral blade 6 (Fig. 5) having a spiral strip 6b formed therein is rotatably fitted therein, and the above concrete feed pipe 1
The tubular pedestal 3 and the spiral blade 6 constitute a concrete press-fitting device.

Next, a procedure for constructing a pile on site using this device will be described.

First, the auger rod 10 is arranged at the pile driving position so as to form a pile hole. The auger rod 10 has a spiral blade 11 formed on the rod tip side and an excavating blade 12 formed on the tip edge. Further, a plurality of kneading drums 13 are provided at predetermined intervals on the rod above the spiral blade 11, and plate-shaped stirring blades 14 are radially installed between the drums 13 and 13. .

The auger rod 10 is rotated and lowered to excavate a pile driving position (table 6). During this excavation, if desired, fresh water is injected from the tip of the auger rod 10 into the excavated portion. The earth and sand excavated by the auger rod 10 becomes mud, which is agitated by the agitating blades 14 and kneaded by the kneading drum 13 to the excavation hole wall to form the pile holes 15 (Fig. 7). In addition, a cylindrical casing 16 is fitted and inserted in the upper end of the pile hole 15, the casing 1
6, a flange 16a is formed on the upper end edge, and four ribs 16b are formed on the outer periphery to prevent rotation. By inserting the casing 16, it is possible to prevent the mud block near the surface of the ground from falling into the pile hole 15 and the inner wall of the pile from collapsing.

After the pile holes 15 are formed, cement milk is supplied from the lower end of the auger rod 1 (Fig. 8), and the mixture 18 of the residual soil and cement milk is used for root consolidation (9th).
After that, the auger rod 10 is pulled out from the pile hole 15, and the rebar cage 17 is inserted and installed in the pile hole 15 (No. 10).
Figure). Further, the concrete inlet pipe 1 is arranged at the center of the pile hole 15 and inside the rebar cage 17 (No. 11).
Figure). When installing the concrete inlet pipe 1, the tubular inlet pipe pedestal 3 is fixed to the upper part of the casing 16. The concrete inlet pipe 1 passes through this cradle 3
The flange 1a is inserted into the pile hole 15, the flange 1a contacts the upper plate 3a, and the rib 2 engages with the slit 5. In addition, at the tip edge of the concrete inlet pipe 1, when the concrete inlet pipe 1 is inserted into the pile hole 15, a tape or the like is provided so that the mud in the pile hole 15 does not enter the concrete inlet pipe 1. Install a simple lid (not shown). Since this simple lid causes buoyancy when the concrete inlet pipe 1 is inserted into the pile hole 15, a counterweight is provided at the lower end thereof.

A hopper 18 is attached to the upper part of the concrete feed pipe 1 arranged in the pile hole 15, concrete is poured into the concrete feed pipe 1 from this hopper 18, and then spiral blades 6 are placed inside the concrete feed pipe 1. Lower and push in concrete. Further, concrete is poured into the concrete inlet pipe 1 and the spiral blade 6 is rotated in the illustrated direction at a fixed position to forcibly press the concrete into the pile hole 15 through the lower portion of the inlet pipe 1 (Fig. 12). . After press-fitting a predetermined amount of concrete, the concrete feed pipe 1 is pulled up and the hopper 18 is removed. This concrete inlet pipe 1
Are temporarily received by a crane (not shown). Next, the spiral blade 6 is pulled out from the pile hole 15 while being rotated in the same direction as the above-described direction. About 3 m of the concrete receiving pipe 1 that has been temporarily received is cut off and installed again on the receiving pipe receiving stand 3. A hopper 18 is attached to the upper part of the concrete inlet pipe 1, and concrete is sequentially pressed in by rotating the spiral blade 6 in the same manner as described above. This press-fitting of concrete and the cutting of the concrete feed pipe 1 are repeated to pour concrete into the pile holes 15 from the lower part in order. . In this way, concrete can be efficiently placed in the pile holes having a relatively large specific gravity, and the residual mud in the pile holes 15 is replaced with concrete, and the pedestal 3
It is discharged to the outside of the pile hole 15 through the open part on the side of the. Since this discharge is the volume of the pile hole, the processing amount is 1/2 that of the conventional one.

After the placing of concrete is completed (Fig. 13), the remaining concrete inlet pipe 1 and the spiral blade 6 are extracted from inside the pile hole 15, and the casing 16 is extracted from the pile hole 15 (Fig. 14).

After this, the concrete hardens over time, so that concrete piles can be efficiently constructed on site.

(Effect of the Invention) According to the present invention, a tubular pedestal having a through hole that is installed and fixed to the upper end of the pile hole, and a through hole of the tubular pedestal can be moved vertically. A concrete inlet pipe inserted so as to engage the ridges (ribs) of the concrete inlet pipe with the grooves (slits) of the tubular pedestal so as to lock in the rotation direction, and to rotate inside this concrete inlet pipe Since it consists of spiral blades that can be inserted as much as possible, the concrete inlet pipe is
Even if it is supported by the tubular pedestal without rotating due to the rotation of the spiral blade, and the specific gravity of the pile hole contents is relatively large, the effect that the concrete can be reliably and efficiently pressed into the pile hole is obtained. is there. Further, it is possible to prevent the pile holes from collapsing. In addition, since the cylindrical pedestal has a shape in which the upper and lower plates are connected by vertical plates and the sides are open, muddy water in the pile holes is easily discharged from the sides of the cylindrical pedestal to the outside of the pile holes. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a plan view of a cylindrical pedestal showing an embodiment of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a front view of a concrete inlet pipe, and FIG. 4 is a plan view of the same. FIG. 5 is a front view of the spiral blade, and FIGS. 6 to 14 are partial cross-sectional views showing the steps of in-situ casting using the device of the present invention. FIG. Fig. 8 is at the end of excavation, Fig. 8 is at the time of root consolidation, Fig. 9 is at the time of removing the auger rod,
The figure shows when the rebar cage is inserted, Fig. 11 shows when the concrete feed pipe is arranged, Fig. 12 shows when concrete is put in, Fig. 13 shows when the concrete feed pipe and spiral blade are removed, and Fig. 14 shows when concrete is hardened. It is shown. 1 ... Concrete inlet pipe 3 ... Cylindrical pedestal, 4a, 4b ... Through hole 5 ... Slit 6 ... Spiral blade

Claims (1)

[Scope of utility model registration request] 1. A cylindrical pedestal which is installed and fixed at the upper end of a pile hole and which has upper and lower plates having through holes connected to each other by a vertical plate to form a cylindrical pedestal whose side is open, and this cylindrical pedestal. A concrete feed pipe that is vertically movable into the through hole of the flat pedestal and is inserted so as to be locked in the rotation direction; and a spiral blade that is rotatably fitted in the concrete feed pipe. A cast-in-place pile, comprising a ridge formed along the axial direction on the concrete inlet pipe, and a groove for engaging the ridge provided on at least one of the upper plate and the lower plate. Concrete pouring equipment