JP2002180457A - Processing method for constructional sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To process sludge generated at a construction site by using a steel pipe of an earth retaining wall or the like. SOLUTION: In a construction method of the earth retaining wall or a steel pipe pile by soil cement and a steel pipe pile, the steel pipe pile 1 is used provided with a partition mechanism 10 opened and closed by operation from the ground, the steel pipe pile 1 is inserted inside the soil cement 3 in an opened state of the partition mechanism 10, the partition mechanism is closed, unhardened soil cement 3 above the partition mechanism 10 is discharged and a cavity part 5 is formed inside the steel pipe pile 1. Soil cement (the discharged mud) overflowed by excavation or the like of the ground in construction of the earth retaining wall or the like and soil cement discharged from inside the steel pipe pile 1 are dehydrated and lightened. The lightened sludge 6 is processed by backfilling it in the cavity part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to reduce the amount of mud discharged from a construction site, especially the cement which is generated in the construction of earth retaining walls or steel pipe piles made of steel pipes used as earth retaining or partitioning. The present invention relates to a method of treating contained mud using soil retaining walls and steel pipes of steel pipe piles.

[0002]

2. Description of the Related Art At construction sites such as the construction of underground structures, earth retaining walls are constructed as earth retaining or partition walls. Among various types of retaining walls, steel pipe column retaining walls are known to be excellent in waterproofness, have good workability, and can secure high construction accuracy.

As shown in FIG. 6, for example, a plurality of steel pipe piles 1 and 1 are buried by connecting a plurality of steel pipe piles 1 and 1 in a column shape. Is formed by continuously excavating holes 4 having a larger diameter than the steel pipe pile 1 and filling with soil cement 3, and the steel pipe piles 1, 1 are sunk therein while being connected by the joint 2.

[0004] In the construction of earth retaining walls and steel pipe piles constructed using steel pipes such as the above-mentioned steel column pillar soil retaining wall as a core material, since soil cement overflows from an excavation hole along with excavation of the ground, this waste mud is discarded. There is a need. Conventionally, this sludge is transported to a designated place and treated by landfill or the like.

[0005]

However, transporting and treating the muddy soil to a disposal site requires a large amount of cost, and it is not only difficult to secure a disposal site every year, but also the Because of its high content of cement and high water content, it is subject to strict restrictions on environmental measures as industrial waste, making disposal more difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. In constructing a steel pipe column retaining wall and the like, a hollow portion is formed in a steel pipe used for the same.
The soil cement (dewatered soil) that overflowed due to excavation of the ground, etc. was converted into a solid (dewatered cake) of soil cement that was reduced in volume by dewatering, and this was buried back in the cavity, so that the waste soil was conventionally filled. Utilizing steel pipes and steel pipe piles such as steel column pillar soil retaining walls that have not been used after being killed, filling processing is performed inside them, enabling on-site processing of construction waste soil, It is an object of the present invention to provide a processing method that eliminates transportation costs and landfill processing costs and is expected to reduce construction costs.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, the construction of a retaining wall or a steel pipe pile (hereinafter referred to as a retaining wall, etc.) such as a retaining wall made of steel pipe and a core material, is used. At times, steel pipes or steel pipe piles (hereinafter referred to as steel pipe piles) inserted into soil cement are used, and holes are formed in the steel pipe pile to backfill muddy soil. Then, the dewatered sludge cake generated by the construction of the earth retaining wall or the like is subjected to a dewatering treatment to reduce the amount of the dewatered sludge dewatered cake.

In the present invention, a steel pipe pile provided with a partition mechanism which is opened and closed by an operation from the outside (ground) is provided at an appropriate position between the upper and lower sides thereof. This steel pipe pile is
After the partition mechanism is inserted into the borehole filled with soil cement with the partition mechanism open, the partition mechanism is closed, and while the soil cement is uncured, the soil cement in the steel pipe pile above the partition mechanism is drained. It is discharged using a mud pump or the like, and the inside of the steel pipe pile above the partition mechanism is hollowed out. Then, the inside of the hollow portion is used for backfilling of mud soil.

The above-mentioned partitioning mechanism is composed of a partition plate having an opening (flow hole) through which soil cement can flow, and a lid plate or a plug which can be opened and closed by an operation such as extending an index rope from above the ground. . The cover plate is provided in a sliding manner below the partition plate, or provided rotatably via a horizontal shaft, or so that the flow hole is closed by a plug suspended from the index rope. What is done is applied.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, taking construction of a steel pipe column retaining wall as an example. FIG. 1 shows an embodiment of the present invention in the order of steps, and FIGS.
FIG. 5 shows various embodiments of the partition mechanism in the steel pipe pile used in the present invention.

The construction of the steel pipe column retaining wall, which is the object of the embodiment, is performed according to the conventional construction procedure. That is, as shown in FIG. 6, a steel pipe pile 1 serving as a core is provided with a joint 2 on an outer side of the steel pipe column retaining wall, and a drill hole 4 filled with soil cement 3 is sequentially formed. Meanwhile, the steel pipe piles 1,1 in the soil cement 3
Is inserted while being connected via the joint 2 to construct a soil cement retaining wall using the steel pipe pile 1 as a core material.
In the present invention, other types of retaining walls can be widely applied as long as the retaining wall is a composite of soil cement and a steel pipe pile 1 provided with a partition mechanism that can be opened and closed inside. Further, as shown in FIG. 1, the partition mechanism 10 is provided at a lower portion in the steel pipe 1, but the position at which the partition mechanism is provided is not limited. Further, the present invention can be applied not only to earth retaining walls but also to the construction of steel pipe piles using soil cement and steel pipe piles.

As shown in FIGS. 1 and 2, for example, the partitioning mechanism 10 is in contact with the inner periphery of the steel pipe pile 1 and has a through hole at the center.
An annular partition plate 11a forming the base plate 12a is fixed, and a lid plate 13a for opening and closing a flow hole is engaged with the guide rail 14 below the partition plate 11a to slide in the radial direction of the partition plate 11a. It is provided freely. An index rope 15 is attached to one end of the cover plate 13a and extends to the outside of the steel pipe pile 1 through a through hole 16 provided in the partition plate 11a.

In order to keep the circulation hole 12 open, FIG.
The cover plate 13a is moved to one side of the partition plate 11a as shown in FIGS. Then, FIG. 1 (b), FIG. 2 (b),
As shown by the arrow in (b), the rope 15
If the cover plate 13a is pulled until it hits the stopper 17 projecting below the partition plate 11a, the cover plate 13a overlaps the flow hole 12a and closes it.

When the earth retaining wall is constructed, the steel pipe pile 1 provided with the above-mentioned partitioning mechanism 10 is inserted into the excavation hole 4 filled with the soil cement 3 as shown in FIGS.
The partition plate 11a is inserted with the circulation hole 12a opened. At this time, since the flow hole 12 is open, the soil cement 3 fills the steel pipe pile 1. When the steel pipe pile 1 is inserted to a predetermined depth as shown in FIG.
Is moved to close the flow hole 12a of the partition plate 11a. Next, before the soil cement 3 is hardened, FIG.
As shown in the figure, the steel pipe pile 1 above the partition plate 11
The soil cement 3 in the inside is discharged to the outside using a mud pump (not shown) or the like. As a result, a hollow portion 5 for backfilling is formed in the steel pipe pile 1 above the partition plate 11.

On the other hand, in the construction of the steel pipe column soil retaining wall, the soil cement that has overflowed during the excavation of the ground and the soil cement (discharged soil) discharged from the steel pipe pile 1 are subjected to a dewatering treatment device or the like in the construction site. Use and dehydrate to reduce weight. Then, the reduced dehydrated cake 6 is put into the hollow portion 5 and backfilled.

FIGS. 3 to 5 show another embodiment of the partition mechanism 10. FIG. The embodiment shown in FIG.
A plurality of circulation holes 12b are provided at intervals in the circumferential direction in 1b, and a lid plate 13b formed by projecting a plurality of members for opening and closing the circulation holes 12b is provided below the partition plate 11b. A pivot 18 is provided so as to be rotatable in the plane direction, and one member of the cover plate 13b has a through hole 16 provided in the partition plate 11b.
An index rope 15 is attached extending through the steel pipe pile 1 to the outside of the pile.

In order to keep the flow holes 12b open, as shown in FIG. 3, each member of the cover plate 13b is positioned within the space between the flow holes 12b, 12b. In order to close the flow hole 12b, the rope 15 is pulled from outside the steel pipe pile, and the cover plate 13b is rotated, so that each member thereof may be positioned so as to overlap the flow hole 12b.

The embodiment shown in FIG. 4 has a flow hole 12a at the center.
A lid plate 13c, which can cover the flow hole 12a, is provided vertically below the partition plate 11a having a horizontal axis 19 at one end thereof, and a cover plate 13c provided on the partition plate 11a at the other end thereof. An index rope 15 extending to the outside of the steel pipe pile 1 through the hole 16 is attached. If the rope 15 is loosened, the cover plate 13c hangs down by its own weight as shown in FIG. Is opened, and when the rope is pulled, the cover plate 13c rotates to close the communication hole 12a as shown in FIG. 4 (b). Insertion of the steel pipe pile 1 is performed with the lid plate 13c hanging down.

The embodiment shown in FIG. 5 has a flow hole 12 in the center.
and a resilient plug 20 having a weight 21 that fits into the flow hole 12a of the steel pipe pile 1 through the flow hole 12a. And is suspended below the partition plate 11a by an index rope 15 extending therefrom. Fig. 5 (a) when the steel pipe pile 1 is inserted
As described above, the rope 15 is extended so that the plug 20 is sufficiently separated from the flow hole 12a. In this case, the plug 20 receives the resistance of the soil cement 3 when the steel pipe pile 1 is inserted, but the weight 21 is provided, so that the flow hole 12a can be kept open. Then, to close the flow hole 12a, the rope 15 is pulled, whereby the plug 20 rises and fits into the flow hole 12a as shown in FIG.

The partition mechanism of the steel pipe pile 1 is not limited to the above-mentioned embodiment, but may be any suitable one as long as it has a partition plate having a flow hole and a structure capable of opening and closing the flow hole. .

Further, the present invention can hollow the inside of the steel pipe pile as a whole, and can take a large capacity, so that it can be used not only for dewatered cake of muddy soil, but also for backfilling of other general construction soil discharging and the like. Can be used.

[0022]

As described above, according to the method of the present invention, when constructing a retaining wall or the like using a steel pipe pile and soil cement, the retaining wall which has been conventionally buried and not used. Utilizing a steel pipe pile, etc., a mechanism that can be opened and closed by operation from the ground is provided on the steel pipe pile, and by this operation and the simple operation of discharging soil cement in the steel pipe pile, mud is discharged into the steel pipe pile. In addition to forming a cavity that can be backfilled, the sludge generated in the construction of the retaining wall etc. was reduced by dehydration treatment, and the reduced dehydrated cake was buried in the cavity hole in the steel pipe pile. Therefore, it is now possible to easily dispose of construction waste, which is currently difficult to dispose of as industrial waste, at the construction site, and to transport the waste and reclaim it to other places. Costs required to sense the can be reduced by a large margin,
Construction costs can be reduced.

[Brief description of the drawings]

FIGS. 1A, 1B, 1C, and 2D show a first embodiment of the present invention in the order of steps. FIGS.

FIG. 2 shows an embodiment of a partition mechanism.
Is a longitudinal sectional view, and (b) is a bottom view.

FIGS. 3A and 3B show another embodiment, wherein FIG. 3A is a longitudinal sectional view, FIG. 3B is a bottom view of a state in which a flow hole is closed, and FIG. 3C is a bottom view of the open state. .

FIGS. 4A and 4B show still another embodiment of the present invention, wherein FIG. 4A is a longitudinal sectional view in which a flow hole is opened, FIG. 4B is a longitudinal sectional view in a closed state, and FIG. It is.

5A and 5B show still another embodiment of the present invention, in which FIG. 5A is a longitudinal sectional view in a state where a flow hole is opened, and FIG. 5B is a longitudinal sectional view in a closed state.

FIGS. 6A and 6B show a steel pipe column retaining wall, wherein FIG. 6A is a plan view and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel pipe pile 3 Soil cement 4 Drilling hole 5 Cavity part 6 Dewatered cake of muddy soil 10 Partition mechanism 11 Partition plate 12a, 12b Flow hole 13a, 13b Cover plate 15 Index rope 16 Through hole 18 Axis 20 Plug 21 Weight 21 Weight

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Uehara 3-1-3, Nihonbashi Muromachi, Chuo-ku, Tokyo Headquarters of Kubota Tokyo Co., Ltd. (72) Inventor Mitsugu Otsuki 1-6 Shiohama, Ichikawa-shi, Chiba Kubota Ichikawa In the factory (72) Inventor Atsushi Shibata 1-6 Shiohama, Ichikawa-shi, Chiba F-term in Kubota Ichikawa factory (reference) 2D049 EA02 EA14 GB05 GC11 GD03 GE04

Claims (1)

[Claims] In the construction of a retaining wall or the like formed by inserting a steel pipe pile into an excavation hole filled with soil cement,
The steel pipe pile is provided with a partition mechanism that is opened and closed by an external operation inside the steel pipe pile, and after inserting the steel pipe pile into the excavation hole with the partition mechanism opened, the partition mechanism is closed, While the soil cement is uncured, the soil cement located above the partition mechanism in the steel pipe pile is discharged to form a hollow part, and on the other hand, the muddy soil generated by the construction of the retaining wall etc. is dewatered. A method for treating construction waste mud, comprising reducing the amount of dewatered cake and burying it in the cavity.