JPH0718152B2 - Excessive concrete treatment method using a screw pump and excess concrete removing device used therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a concrete structure constructed in the ground, such as cast-in-place concrete piles or extra-strength concrete provided on top of an underground continuous wall or hole wall stabilization. The present invention relates to a method for treating surplus concrete with a screw pump for removing liquid and fresh water, and a removing device used therefor.

[Conventional technology]

For example, in the construction of cast-in-place concrete piles, a slime mixing part occurs at the upper end of the cast concrete, so an extra-height portion of an appropriate height is provided at the upper end of the pile, and this extra-height portion is provided after the pile is completed. Is removed to obtain a concrete pile having a pile head at a predetermined height and having excellent strength.

Conventionally, the removal of the above-mentioned extra portion has generally been performed by chipping after solidification of concrete.

[Problems to be Solved by the Invention]

By the way, the removal of the surplus portion by the chiseling work as described above requires a long time for the removing work, and there is a problem that the chipping liquor must be disposed of and the work cost is high. In particular, during the construction of the pile, while pouring concrete into the excavated hole, it is impossible to visually confirm the top end position of the concrete because the cloudy hole wall stabilizing liquid is filled in the hole. There is a case that the surplus becomes higher than necessary due to over-mounting. When the extra portion has an excessive thickness, the work cost for chipping becomes very high.

Furthermore, when the extra portion is formed deep in the ground, the work cost for transporting the chippers is high.

Moreover, since the use of a vibrating tool is required for the chipping work for removing the extra portion, it causes the noise pollution to the surrounding residents due to the generation of a large noise, and its improvement is desired at present.

[Object of the Invention]

This invention was made in order to solve the above problems, the removal of surplus concrete can be efficiently carried out at low cost without the need for chipping work of the surplus concrete by a screw pump. It is an object to provide a treatment method, and it is also an object to be able to remove surplus concrete at a deeper place and to accurately remove only the surplus portion.

[Means for Solving the Problems]

In order to solve the above problems, the method for treating surplus concrete with a screw pump according to claim 1 uses a screw pump that stores an auger in a casing and rotates the auger with a driving machine. Arranged to move vertically vertically on the extra portion of the concrete structure, the screw pump is moved downward to penetrate the lower end intake port to the vicinity of the bottom layer of the extra portion,
The auger of this screw pump is rotated to convey and remove the excess portion before the concrete is solidified.

Further, the excess concrete removing device according to claim 2 comprises an elevating arm that is supported to be able to ascend and descend above the extra portion of the concrete structure, and a screw pump fixed to the elevating arm. Is
A casing having an upper end attached to the elevating arm, an auger housed inside the casing, a drive unit attached to the elevating arm and rotating the auger, and a discharge connected to the upper end of the casing. And a mechanism.

[Action]

According to claim 1, if the lower end intake of the screw pump is inserted into the upper end surplus portion of the structure formed by casting concrete, and the surplus portion is conveyed and removed before the concrete is solidified, the upper end can reach a predetermined height. A concrete structure will be completed.

In that case, since the concrete is conveyed by a screw pump instead of suction or the like, it is possible to convey the overfilled concrete even from a deep place. Further, since the caging of the screw pump is not deformed, by controlling the descending amount of the screw pump, the lower end intake port can be made to accurately enter the vicinity of the lowermost layer of the extra portion.

In claim 2, when the placing of concrete is completed, the elevating arm is operated to lower the screw pump, and the lower end intake port of the screw pump is inserted into the upper end extra portion of the structure.
The auger is rotated by the operation of the driving machine to convey and remove the excess deposit before the concrete in the excess deposit is solidified, and the removed excess deposit is discharged by the discharge mechanism.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The drawings exemplify cast-in-place concrete piles as concrete structures. FIGS. 1 to 7 show the order of construction of cast-in-place concrete piles, and FIGS. 8 and 9 show a device for removing extra piles. .

The device 1 for removing excess portions is provided with an elevating arm 4 attached to a reader 3 standing on a movable table 2, and the elevating arm 4 is interlocked with a manual or automatic elevating mechanism 5 to move vertically along the reader 3. A screw pump 6 is attached to the elevating arm 4 while being moved.

The screw pump 6 is a member widely used in civil engineering. That is, the auger 8 is housed inside the casing 7 whose upper end is fixed to the elevating arm 4, and the driving machine 9 for rotating the auger 8 is provided on the elevating arm 4, and the upper end of the casing 7 has a section U as a discharging mechanism. It has a structure in which a gutter-shaped gutter-shaped discharge chute 10 is provided in a projecting manner, and further, a bucket 11 for storing the discharge product from the chute 10 is prepared if necessary. Here, a hydraulic motor is preferable as the drive unit 9, but an electric motor or the like may be used.

Next, construction of cast-in-place concrete piles will be described.

First, as shown in FIG. 1, the excavator is aligned with the stand pipe 21 made of steel pipe at the position where the pile is to be constructed.
Starting the excavation of the vertical hole using 22, the vertical hole 23 having a predetermined depth is excavated as shown in FIG.
After pulling out, the rebar cage 24 and the tremie pipe 25 are inserted into the vertical hole 23 as shown in FIG. Next, as shown in Fig. 4, the tremie tube
Concrete is poured into the vertical hole 23 through 25, and sewage is removed at the upper part of the vertical hole 23 by the submersible pump 26, and as shown in FIG. Place concrete up to this position.

By the way, the part of the extra B is about 60-100 cm,
The extra deposit B becomes a defective portion due to the mixture of slime.

After pouring the concrete, the removing device 1 is exposed to the concrete pile, and the hole wall stabilizing liquid or the clear water remaining on the concrete is first conveyed by the screw pump 6, and then the screw pump 6 is further moved downward to lower the end. The intake port is made to penetrate to the vicinity of the bottom layer of the swell B, and the swell B up to the pile head level A before the concrete in this sill B is solidified.
Are conveyed and removed, and the removed excess is collected in the bucket 11.

As a result, as shown in FIG. 6, the upper end of the cast concrete matches the pile head level A, and the concrete pile C is completed by solidifying the concrete. After that, as shown in FIG. 7, the upper end of the concrete pile C is completed. The foundation D will be built in.

Therefore, in the above embodiment, the chipping work of the extra portion and the disposal of the chippings are not required, the working cost is reduced, and the use of a vibrating tool or the like is not required, so that noise pollution is not likely to occur.

In that case, since the excess pumped concrete is conveyed by the screw pump 6 without using a method of sucking up and removing it together with air using a suction hose, for example, it is possible to stably convey the supplemental concrete from a deep place. ,
Therefore, the applicability to the site is excellent and the excess concrete can be transported from a deep place with good workability.

Further, since the caging 7 of the screw pump 6 does not deform, the lower end intake port is located near the lowermost layer of the extra portion by controlling the descending amount of the screw pump 6 with reference to, for example, the upper edge of the stand pipe 21. Since it can be accurately inserted, only the extra portion can be accurately removed, and the pile head of a desired height can be constructed while obtaining the required strength.

In the above-mentioned embodiment, the gutter-shaped discharge chute 10 having a U-shaped cross section is continuously provided at the upper end of the casing 7 as the discharge mechanism. However, a pipe or a hose may be considered as the discharge mechanism. In this case, for example, a pipe or a hose may be attached to the upper end of the casing 7 via a rotary joint. Further, although the screw pump 6 is fixed to the elevating arm 4, instead of this, the screw pump may be fixed to an arm or the like provided in a backhoe or a crane so as to be able to move up and down. In addition, in the above-mentioned example, the case of removing the extra embankment concrete of the cast-in-place concrete pile was shown
For example, surplus concrete of a concrete structure constructed by pouring concrete into the ground such as an underground continuous wall can be similarly removed.

〔The invention's effect〕

As described above, in the method for treating excess concrete using the screw pump of claim 1, the excess portion of the placed concrete is conveyed and removed by the screw pump configured by the casing and the auger. Removal can be done immediately after placing concrete, no chipping work is required, work efficiency can be greatly improved and work cost can be reduced.Excessive concrete can be removed even in a deep place, and only extra parts can be removed. Can be removed accurately.

Moreover, the casing and the auger used for the construction of the screw pump are members that are widely used in civil engineering work, and by using these members, it is possible to suppress the generation of new equipment costs and remove the excess portion.

Further, according to the excess concrete removing device of the second aspect, it is possible to provide the most suitable device for the processing method.

[Brief description of drawings]

1 to 7 are process drawings showing the order of construction of cast-in-place concrete piles, FIG. 8 is a plan view showing the usage state of the removing device, and FIG. 9 is a perspective view of the same. 1 ... removing device, 6 ... screw pump, A ... pile head level, B ... overfill, C ... concrete pile.

Claims (2)

[Claims] 1. A screw pump in which an auger is housed in a casing, and the auger is rotated by a driving machine,
This screw pump is arranged so as to vertically move vertically above the extra portion of the concrete structure, and the screw pump is moved downward so that the intake port at the lower end of the screw pump penetrates to the vicinity of the bottom layer of the extra portion. The method for treating excess concrete using a screw pump, characterized in that the auger is rotated to convey and remove the excess portion before the concrete solidifies. 2. An elevating arm that is supported so as to be able to ascend and descend above a surplus portion of a concrete structure, and a screw pump that is fixed to the elevating arm. The screw pump has an upper end portion that is attached to the elevating arm. A casing attached to the casing; an auger housed inside the casing; a drive unit attached to the elevating arm and rotating the auger; and a discharge mechanism connected to the upper end of the casing. Excessive concrete removal equipment to be used.