JPS5941842B2 - Manufacturing method and device for knotted centrifugal concrete piles - Google Patents

Description

[Detailed Description of the Invention] The present invention automatically and reliably creates a sectioned hollow pile that is evenly filled with concrete material to the end corners of each joint and is strongly compacted together with the joint body. The present invention relates to a method and apparatus for manufacturing a centrifugal concrete pile with sections.

When manufacturing hollow concrete piles, which are widely used in foundation ground construction such as modern construction, concrete material is filled in advance into a half-cylindrical formwork together with reinforcing steel core material. This was driven and rotated by a centrifugal forming device, and the centrifugal force of the rotation was used to form a pile post having joints.

However, in such a conventional method, a certain amount of concrete material is filled into a certain formwork and rotational centrifugal force is applied to this, so the action of the rotational centrifugal force is exerted on the joints and the body. Therefore, as shown in Figure 2, among the concrete materials that can be filled into the formwork, relatively light so-called fine aggregates such as cement and sand are used in the inner layer of the core shaft, and heavy Coarse aggregates such as gravel and stones are naturally separated from the outer layer, producing a very unstable pile column. The inner wall portion of the joint caves in, causing a serious defect in terms of strength.

In addition, in order to prevent the depression C, even if the formwork is filled with concrete material in an amount corresponding to each of the joints and the body while being pressurized, each joint of the uneven formwork is It is extremely difficult to sufficiently fill and distribute the concrete material to the end, so it has been considered impossible to form a sectioned pile column in which the inside and outside of the pile column are compacted almost evenly. It is.

The present invention focuses on these drawbacks and aims to fundamentally solve these serious problems. A preliminary centrifugal forming device is mounted on a trolley, and a formwork attached to the preliminary centrifugal forming device is placed on the preliminary centrifugal forming device so as to be rotatable in conjunction therewith, and a concrete injection pipe extending from the concrete pump is inserted into the formwork. The concrete material is filled and distributed at each joint of the formwork by moving the trolley, the preliminary centrifugal forming device is driven to preform the joints, and the trolley is moved again in the same manner as above. Concrete material is injected into the body and then transferred to this centrifugal forming equipment to give a molding finish, thereby creating a pile post with sections that are firmly compacted together with the joint body. It is an object of the present invention to provide a method for manufacturing a centrifugal concrete pile with sections, which is characterized in that it can be formed, as well as an apparatus for manufacturing the same.

The structure of a specific example of the apparatus of the present invention will be explained in detail below with reference to illustrative drawings.

The trolley 1 is powered by an electric motor 2 and is arranged to move back and forth in a constant manner with respect to a concrete pump 3 fixed on the ground.

Further, a preliminary centrifugal molding device 4 is mounted on the platform of the trolley 1, and the preliminary centrifugal molding device (is arranged approximately in parallel with a drive rotation shaft 6 that is interlocked with the power 5). Each of the rotating shafts 6 and 7 is equipped with a transmission roller 8 of a predetermined diameter for rotating the formwork.
・There is a padding section.

The concrete pump 3 is fixed at one of the traveling base points of the cart 1, and a concrete filling injection pipe 9 of an appropriate length having a discharge port 10 at its tip extends from the front surface thereof. Fixed.

The formwork 11 has a joint section 11' of the bed section on the outer periphery, and the preliminary centrifugal forming device 4 is installed at an appropriate position on the periphery.
A transmission wheel 13 . . . which connects with the transmission roller 8 of the molding machine 1 and connects the power from the preliminary centrifugal forming device 4 to the formwork 11 is disposed on the floor.

Reference numeral 12 designates an injection pipe insertion port that is opened at one end of the formwork.

The present invention is constructed with an inclined structure, and the method of manufacturing a hollow concrete pile with sections using such an apparatus will be explained in order according to the drawings. The concrete injection pipe 9 is inserted into the insertion port 12 at one end of the frame 11, and the cart 1 is inserted into the tip discharge port 1 in this state.
Move the digit until 0 is located at the other end.

Next, the concrete pump 3 is activated to inject the concrete material A from the discharge port 10 at the tip of the injection pipe 9 as shown in FIG. ... can be filled with a predetermined amount of concrete material A.

After the knot filling operation is completed, the preliminary centrifugal molding device A
By driving and rotating the formwork 11 to rotate the formwork 11 at low speed, the concrete material I is sufficiently distributed and filled to every corner of each joint part 11' of the formwork 11, and the joint part I is compacted to a certain strength. ' preforming is performed.

When the preforming of the joint part A' is completed, the driving of the preliminary centrifugal forming device 4 is temporarily stopped, the rotation of the formwork 11 is stopped, and then the amount of concrete material I' suitable for forming the body part is refilled. Each time, the cart is moved in the same manner as described above, and the formwork 11 is filled through the injection pipe 9 as shown in Figure 6. When the prescribed filling is completed, the formwork 11 is filled with the concrete material. The packed body is transferred to the upper part of the centrifugal molding device 14 installed elsewhere, and rotated again by turning on the rotating light while gradually increasing the upper rotation speed from low speed rotation to high rotation speed. Using centrifugal force, it is possible to form concrete piles with sections that are extremely strongly and integrally compacted together with the joint body.

Further, in the above-mentioned embodiment, after the concrete material A is filled into each joint 11' of the formwork 11, the preliminary centrifugal forming device A is driven and rotated to preform the joints A', and then the body concrete material A is filled. However, the present invention is not limited to such a method; for example, when pouring the joint 11' of the concrete material A, the preliminary centrifugal forming device (driving the Formwork 11
It is also possible to perform the preforming of the joint part A' while adding rotation to the body, and to fill the body part with the body concrete material A' while continuing this rotation, and to perform the preforming of the body part at the same time. It is possible.

As described above, in the method for manufacturing a centrifugal concrete pile with sections according to the present invention, the preliminary centrifugal forming device A and the formwork 11 are mounted on the trolley 1 which is movable forward and backward relative to the concrete pump 3. Each node 11' of the frame 11
After filling and distributing concrete material A in an amount suitable for forming the joints, preforming the joints in a preliminary centrifugal forming device A, filling the trunk concrete material I into the body of the form, Furthermore, this centrifugal forming device performs more powerful compaction, so it is possible to compact the concrete even to the ends of each joint 11' of the formwork 11, which was the most difficult to do with the conventional method. It is possible to automatically and easily create hollow concrete piles that are always integral and strong by reliably distributing the material A and without separating the fine aggregate opening and the coarse aggregate C at the joints and body parts. Manufacture has advantages.

Moreover, as shown in Figure 7, the inner wall surface of the shaft hole of the pile column formed by this method has no problems such as depressions in the inner layer of the joints, and the shaft hole is approximately constant over the entire length and is in a state without distortion. Needless to say, it is molded in

Furthermore, since the apparatus of the present invention has the preliminary centrifugal forming apparatus 4 mounted integrally on the trolley 1, the molds are placed in separate centrifugal forming apparatuses each time when preforming the joints and the body. It also has remarkable effects such as being able to reliably mold in an extremely short time with good efficiency without requiring frequent labor such as replacement.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of a centrifugal concrete pile with sections that can be formed using a conventional method, Fig. 2 is a cross-sectional view of the same as above, Fig. 3 is an overall view of the device of the present invention, and Fig. 4 is a cross-sectional view of the same as above. FIG. 5 is a diagram of a packed body of the joint concrete material, FIG. 6 is a diagram of the packed body of the trunk concrete material, and FIG. 7 is a longitudinal sectional side view of a centrifugal concrete pile with a section formed by the method of the present invention. Explanation of symbols: 1...Dolly, 2...Electric motor, 3...Concrete pump, (...
・Preliminary centrifugal molding device, 5... Power, 6...
... Drive rotation shaft, 7 ... Driven rotation shaft, 8 ...
...Transmission roller, 9...Concrete injection pipe, 10...Discharge port as above, 11...Formwork, 11'...Top section as above, 12... Injection pipe insertion port, 13... Conduction ring, A... Concrete material, Mouth... Fine aggregate, C...
・Coarse aggregate, 2... Rebar cage, A... Conventional pile column, B... Shaft hole, C... Depression.

Claims (1)

[Scope of Claims] 1. A preliminary centrifugal forming device is mounted on a trolley that is arranged to move forward and backward relative to a concrete pump that is fixed on the ground,
A partial formwork is mounted on the preliminary centrifugal forming device so as to be freely interlocked and rotatable, a concrete injection pipe extending from the concrete pump is inserted into the formwork, and concrete IJ- is applied to each joint of the formwork by moving the cart. The concrete material is filled and distributed, the pre-centrifugal forming device is driven to pre-form the joints, the cart is moved again in the same manner as above and the concrete material is injected and filled into the body, and then this process is carried out. The production of centrifugal concrete piles is characterized in that the concrete piles are transferred to the present centrifugal forming apparatus to give a forming finish, thereby forming a pile column with sections firmly compacted together with the joint body. Method. 2. In the method for manufacturing a centrifugal concrete pile with sections as set forth in claim 1, the preliminary centrifugal forming device is driven to preform the knots when filling the joint concrete material, and the driving is continued. 1. A method for manufacturing a centrifugal concrete pile with sections, characterized in that the body is filled with a concrete IJ-concrete material, and the body is also preformed at the same time as the filling. 3. A preliminary centrifugal forming device is mounted on a trolley that can be moved forward and backward relative to a concrete pump that is fixed on the ground, and a formwork attached to the preliminary centrifugal forming device is mounted so as to be rotatable in conjunction with it, and a An apparatus for manufacturing a centrifugal concrete pile with a section, characterized in that a concrete injection pipe extending from the concrete pump is inserted in and out by moving a truck.