JPH11131961A - Casing shaft construction method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a bucket excavator means or a center shaft means in casing shaft construction. SOLUTION: In a rotational press-fit course of a casing C by a casing shaft construction device constituted of a shaft construction machine A for making rotational press- fit of the casing C in the earth, an under-reamed excavation bucket B including an excavation edge for excavating earth and sand, an under-reamed edge and an earth and sand storage box and a separable interlocking mechanism provided between the lower end site of the front casing C1 and the under-reamed excavation bucket B, the under-reamed excavation bucket B is interlocked with the front casing C1 to make rotational press-fit motion of the casing C and, at the same time, it is rotationally pushed down to excavate earth and sand in a shaft by the excavation edge to store them in the storage box. In the case the storage box is filled with the excavated earth and sand, the under-reamed excavation bucket B is separaged from the interlocking mechanism to move the earth and sand to the outside of the shaft, and after the press-fit of the casing up to specific depth is made, under-reamed excavation is made with an under-reamed edge. Then, concrete is cast in the under-reamed excavation section, and the front end site is embedded into the concrete to be cast to form the bottom base.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for constructing a shaft for starting and reaching shafts or manholes in a propulsion method for laying sewerage or the like without digging by burying a steel or reinforced concrete casing. It concerns the device.

[0002]

2. Description of the Related Art There are the following methods for constructing a casing shaft.

1) A caisson method in which a reinforced concrete casing is naturally settled by its own weight. As an application of this method, a casing is forcibly press-fitted by an auxiliary jack.

[0004] 2) A rocking construction method in which a steel casing is rocked and pressed by a rocking jack and a lifting jack.

[0005] 3) A full-rotation method in which a steel or reinforced concrete casing is rotationally press-fitted with a motor and a lifting jack.

In all of the above, construction is performed while excavating the earth and sand in the casing. The underground excavation means is performed by a bucket-type excavator such as a clamshell bucket or a hammer club bucket. It is performed by a method such as a bit or a drilling bucket, and all of them perform underwater excavation on soft ground, and after the casing reaches a predetermined depth, cast concrete at the bottom,
Then, the casing is raised slightly to bring the concrete and the ground into close contact with each other, thereby stabilizing the bottom.

[0007]

In the method for constructing a casing shaft shown in the prior art described above, the means for excavating earth and sand in a casing pit by a bucket type excavator cannot excavate near the lower edge of the casing, so that the excavation bottom plate is flat. Not
In addition, there is a problem that it is difficult to excavate on hard ground. In order to deal with this problem, a center shaft means for excavating by attaching the above excavation bit or drilling bucket to the tip of the rotating shaft of the base machine, such as Keriba Is adopted,
The excavation bit means requires a device for separating the muddy water and the excavated soil because the excavation is performed by the circulation of the muddy water, and these center shaft means require a separate drive device such as the base machine. There is a problem in the work space.

An object of the present invention is to solve the above-mentioned problems by providing a new method for constructing a casing shaft and a device therefor.

[0009]

SUMMARY OF THE INVENTION A method and an apparatus for achieving the above object include a chuck mechanism for gripping a casing made of steel or reinforced concrete, and rotating the casing gripped by the chuck mechanism. A shaft construction machine equipped with a press-fitting mechanism for press-fitting the casing rotated by the rotation mechanism and the rotation mechanism into the soil, and in the process of rotationally press-fitting into the soil by the shaft construction machine while sequentially coupling and connecting the casings, A bottom excavation bucket suspended in the casing pit so as to be able to ascend and descend, and further including a diving blade for excavating earth and sand, a bottom enlarging blade and a housing box for sediment, a lower end portion of a leading casing of the casing and the enlarging bottom It consists of a detachable locking mechanism provided between the excavation buckets,
In addition, the locking mechanism includes a casing shaft construction device including means for transmitting the rotational press-fitting motion or the rotational motion of the casing by the shaft construction machine to the expanded bottom excavating bucket, and the casing being constructed by the shaft construction machine in the ground. In the process of rotary press-fitting, the bottom excavating bucket is locked to the leading casing by a locking mechanism and rotated with the rotating motion of the casing, or rotated and pressed down with the rotary press-fitting motion of the casing, and the excavation blade is used for the underground soil. And when the storage box is full, the bottom excavation bucket is disengaged from the locking mechanism and pulled up to discharge earth and sand in the storage box to the outside. After repeatedly pressing the casing to a predetermined depth by repeating the operation of lowering the bucket into the casing pit and locking it to the leading casing, the bottom expanding blade extends the depth below the lower end of the leading casing. Excavating, then removing the bottom excavation bucket, casting concrete in the bottom excavation section, then slightly press-fitting the casing and embedding the tip part in the cast concrete to form a bottom base This is a method for constructing a casing shaft.

[0010]

Effect of the Invention Rotation of the casing during construction of a shaft,
Since the rotation pressure input is transmitted to the bottom excavation bucket via the locking mechanism at a young age, it is sufficient to hang the wire with a separate drive shaft device for rotating the bottom excavation bucket without using a separate drive shaft device. A general-purpose crane can be used, which can be used even when there is a restriction on the sky.In addition to transmitting the rotational force by the casing's rotational pressure input, that is, the peripheral support method, a large rotational torque can be obtained compared to the rotational transmission by shaft. In addition to the ability to adapt to hard soil, the operation of pulling up the casing as in the conventional case is not required in forming the bottom plate, and the press-fitting depth of the casing is short, so that the workability is good.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a method and an apparatus for constructing a casing shaft according to the present invention. FIG. 1 is a simplified diagram showing an example of a shaft construction machine, and FIG. FIG. 3 is a partial perspective view of a locking mechanism, FIG.
Is a simplified diagram showing a second example of the locking mechanism and a means for preventing the bottom excavation bucket from falling, FIG. 5 is a simplified diagram showing a third example of the locking mechanism, and FIG. 6 is a fourth example of the locking mechanism. FIG. 7 is a simplified diagram showing the construction process of the casing shaft, which will be described below with reference to the drawings.

The present invention relates to a vertical shaft construction machine A for press-fitting into a soil while rotating a cylindrical casing C made of steel or reinforced concrete, and a bottom expansion for excavating and discharging earth and sand in a pit when the vertical shaft is constructed in the casing C. Excavating bucket B,
The vertical construction machine A illustrated in FIG. 1 includes a leading casing C1 of the casing C pressed into the soil and a locking mechanism D of the bottom excavating bucket B. The shaft construction machine A illustrated in FIG. The rotating mechanism E includes a mechanism F and a press-fitting mechanism D. The rotating mechanism E is provided with an external gear 5 having an insertion hole 4 through which a casing C is inserted in a through hole 3 of a lifting frame 2 disposed directly above the base frame 1 for transmission. The chuck mechanism F is connected to the hydraulic motor 7 via the gear 6 and the casing C
A gripping arm 8 for gripping the outer peripheral surface of the external gear 5 is disposed above the external gear 5, and the press-fitting mechanism G pushes the rod end 10 of the lifting jack 9 fixed to the lifting frame 2 downward. It is fixed to the base frame 1, and a through hole 11 is formed in the base frame 1 at a portion facing the insertion hole 4 of the external gear 5.
Is provided.

The widened bottom excavating bucket B includes an earth and sand storage box 12 having a diameter slightly smaller than the inner diameter of the casing C.
A drilling blade 13 is provided on the lower surface of the housing box 12, and the lower peripheral surface portion expands from the diameter of the housing box 12 by natural movement due to forward and reverse rotation of the housing box 12 or expansion and contraction movement of a cylinder.
A returning bottom-extended blade 14 is provided.
A guide roller 16 for guiding the elevation of the bottom excavation bucket B is provided via a hole, and a hook hole 17 for a hook J provided at the end of the wire H of the general-purpose crane is provided. A locking mechanism D with the leading casing C1 is provided. The guide roller 16 is not necessarily required.

The above-mentioned locking mechanism D is provided with the above-mentioned expanded bottom excavating bucket B.
And the top casing C1, and the inner peripheral surface of the lower end portion of the top casing C1 has horizontal pieces 18a, 18'a.
L-shaped engaging bodies 18, 18 each comprising a vertical piece 18b
And the protruding pieces 19, 19 which are engaged with and disengaged from the engaging body 18 are provided on the outer bottom excavating bucket B on the outer periphery of the housing box 12, and are provided below the locking mechanism D. A fall prevention means N for preventing the expanded bottom excavation bucket B from dropping when the shaft is constructed on soft ground is provided. As an example of the fall prevention means N, as shown in FIG. An inward flange 24 is provided around the periphery.

The horizontal portion 18a of the engaging member 18 in the locking mechanism D applies a pressing pressure to the bottom-excavated bucket B, and depending on the soil properties, a separate weight load is applied to the bottom-excavated bucket B, or the weight is reduced by its own weight. 4 can be replaced with the forcible pressing pressure. As shown in FIG. 4, only the vertical piece 18'b is protruded from the inner peripheral surface of the lower end portion of the top casing C1 and only the rotational force of the top casing is applied to the expanded bottom excavating bucket B. In some cases, the locking mechanism D is a mechanism in which a protruding piece 19 ′ that advances and retreats from a cylinder 20 via a connecting rod 21 to and from the engaging body 18 as shown in FIG. The structure such as the mechanism for locking the expanded bottom excavation bucket B by pressing the pressing plate 23 fixed to the end of the piston rod of the cylinder 20 'to the inner peripheral surface of the leading casing C1 by the forward movement of the piston rod as shown in FIG. First,拡底 excavation bucket B at the lower end portion of the single C1 is sufficient to engage away.

In order to construct the casing shaft, the shaft construction machine A is installed on a desired construction ground, and the leading casing C1 is inserted from above the chuck mechanism F of the elevating frame 2 into the insertion hole 4 of the external gear 5 and the base frame. 1 and is gripped by the gripping / separating arm 8 of the chuck mechanism F, and then transmitted by the hydraulic motor 7 of the rotating mechanism E to the transmission gear 6 and the external gear 5.
By lowering the lifting frame 2 with the lifting jack 9 of the press-fitting mechanism G while rotating the leading casing C1 through C are sequentially connected and connected to form a shaft by press-fitting to a desired depth. In the process of rotary press-fitting, a hook J provided at the tip of a wire H of a general-purpose crane is engaged with a locking hole 17 of an expanded bottom drilling bucket B. And the projecting piece 19 of the bottom engraving bucket B is provided with an engaging body 18 provided on the top casing C1.
The vertical portion 18b of the engaging body 18 in the locking mechanism D is projected by the rotary press-fitting movement of the casing C by the shaft construction machine A. 19 in the horizontal rotation direction,
Is pressed in the vertical direction to rotate and press-fit the expanded bottom excavating bucket B, and excavate the earth and sand in the first casing C (casing C) pit by the excavating blade 13 to take into the storage box 12 and fill the storage box 12. Occasionally, the expanded bottom excavation bucket B is locked with a locking mechanism D.
The casing C is pressed into the casing C to the predetermined depth by repeating the operation of removing the sediment from the housing box 12 and pulling it out of the housing box 12 to the outside, and then lowering the casing C down again to lock the locking mechanism D (FIG. 7a, b).

Next, the bottomed excavating bucket B is further lowered to attach the protruding pieces 19, 19 to the horizontal pieces 18 'of the engaging bodies 18, 18.
a, and expand the bottomed blade 14 to expand the diameter of the leading casing C.
The bottom excavation is deepened below the lower end of 1 (FIG. 7C), then the bottom excavation bucket B is removed, and concrete M is poured into the bottom excavation part K by the transfer pipe 22 (FIG. 7D). By slightly press-fitting C, the tip is buried in the cast concrete M to form a bottom plate (FIG. 7E).

In the method and the apparatus for constructing the casing shaft, the rotating pressure input of the casing at the time of constructing the shaft is transmitted to the bottom excavating bucket via the locking mechanism, so that the bottom excavating bucket is rotated. A general-purpose crane can be used, and it is possible to use even if there is a limitation in the sky, as well as being able to use the rotating pressure input of the casing compared to the rotation transmission by the shaft. In other words, a large rotational torque can be obtained by transmitting the rotational force by the peripheral support method, so that it is more capable of adapting to hard soil.Moreover, in forming the base, it is not necessary to pull up the casing as in the conventional case, and the press-fitting depth of the casing is reduced. Workability is good because it becomes shorter.

[Brief description of the drawings]

FIG. 1 is a simplified diagram of a shaft construction machine.

FIG. 2 is a vertical cross-sectional side view of a leading casing portion when a shaft is constructed.

FIG. 3 is a partial perspective view of a locking mechanism.

FIG. 4 is a simplified diagram of a second example of a locking mechanism and a fall prevention unit.

FIG. 5 is a simplified diagram showing a third example of the locking mechanism.

FIG. 6 is a simplified diagram showing a fourth example of the locking mechanism.

FIG. 7 is a construction process diagram of a casing shaft.

[Explanation of symbols]

 A Vertical shaft construction machine B Expanded bottom excavation bucket C Casing C 'Top casing D Locking mechanism E Rotation mechanism F Chuck mechanism G Press-fit mechanism H Wire J Hook K Expanded bottom excavation section M Concrete N Fall prevention means S Drilling blade 1 Base frame 2 Elevating frame 7 Hydraulic motor 9 Elevating jack 12 Housing box 13 Drilling blade 14 Enlarged bottom blade 18 Engagement body 18a Horizontal piece 18'a Horizontal piece 18b Vertical piece 18'b Vertical piece 19 Protrusion piece 19 'Protrusion piece 22 Transfer tube

Claims (2)

[Claims] In a process of rotating and press-fitting into soil with a shaft construction machine having a rotating mechanism, a chuck mechanism, and a press-fitting mechanism while sequentially connecting and connecting steel or reinforced concrete casings, a drilling blade, a widening blade and An enlarged bottom excavating bucket having a storage box for earth and sand is suspended in the casing gallery so as to be able to move up and down, and is locked to the top casing by a locking mechanism capable of being disengaged at a lower end portion of the casing in the top casing gallery. Then, the casing is rotated together with the rotating motion of the casing, or rotated and pressed down together with the rotating press-fitting motion of the casing, to excavate the underground earth and sand with the excavating blade, and accommodate the excavated soil in the accommodation box. The bucket is disengaged from the locking mechanism and pulled up to discharge the earth and sand in the housing box to the outside. After the casing is press-fitted to a predetermined depth by repeating the above operation, the bottom enlarging blade excavates the bottom of the casing to a depth lower than the lower end, then removes the enlarging bottom excavating bucket and places concrete in the engraved bottom engraving part. ,
Next, a casing vertical shaft is formed by slightly press-fitting the casing and embedding a tip portion in the cast concrete to form a bottom plate. 2. A chuck mechanism for gripping and separating a steel or reinforced concrete casing, a rotating mechanism for rotating the casing gripped by the chuck mechanism, and pressing the casing rotated by the rotating mechanism into soil. A shaft construction machine equipped with a press-fitting mechanism, and in the process of rotatingly press-fitting into the soil by the shaft construction machine while sequentially connecting and connecting the casing, the shaft is suspended in the casing shaft so as to be able to ascend and descend, and excavates earth and sand. An excavating bucket provided with an excavating blade, an enlarging blade and a storage box for earth and sand, and a separable locking mechanism provided between a lower end portion of a top casing of the casing and the engraving bucket. In addition, the locking mechanism comprises means for transmitting the rotational press-fitting motion or the rotational motion of the casing by the shaft construction machine to the expanded bottom excavation bucket. A shaft construction device.