JPS615117A - Removal of excess concrete in following unit of underground continuous wall - Google Patents

Abstract

PURPOSE:To perform the breaking operation of concrete with good efficiency by a method in which a breaker is hung down by utilizing one of the counter walls of the adjacent preceding units for a reaction receiver and a guide, and the excess (creeped) concrete on the other counter wall side is broken. CONSTITUTION:The ground between preceding units 6 is excavated while sucking and discharging the excavated soil to form a hole 7 for following unit. A concrete breaker 8 is hung down by a crane and a reaction receiver 10 is lowered along one 6a of the counter walls 6a and 6b of the preceding units 6. The excess (creeped) hardened concrete in the hole 7 portion on the other counter wall 6b side is broken by the breaker 11. The broken concrete is scooped by a clamshell for removal, a reinforcing bar cage is inserted into the hole 7, and concrete is placed to construct a following unit.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method of forming a hole for a succeeding unit by excavating between adjacent leading units of an underground continuous wall constructed at a predetermined interval. The present invention also relates to a method for crushing and removing comfleet that has gone around to the subsequent unit hole side and solidified.

When constructing an underground continuous wall advance unit, first, after excavating an underground hole at a predetermined interval and suctioning out the excavated soil while mixing it with a stable liquid such as bentonite liquid,
As shown in Fig. 4, locking boxes (02) and (02) are inserted into both longitudinal ends of the underground hole (01), and both locking boxes (02) and (02)
ni, using them as a guide, lower the H-section steel (04), (04) to which the reinforcing bar cage (08) is integrally connected by welding, and then lower the locking box (02), (
02) Most of the semicircular portion at the end of each underground hole (OL) is filled with ballast as a backfilling material to prevent concrete from going around. However, for example, some parts of both side walls of the underground hole (old) collapsed, and the H-shaped steel (
04) The poured concrete unexpectedly wraps around from the outside,
There were cases where the concrete that had wrapped around entered the ballast and solidified. 1. If such a wrap-around occurred, leave it as it was and place one piece of concrete in the adjacent preceding unit.
When the trailing unit 0 was built in the middle, there was a drawback that the water-stopping performance was reduced in the concrete part that had gone around and hardened, and it was necessary to remove the concrete part that had gone around and hardened.

[Conventional technology]

Therefore, in order to remove the solidified concrete that has gone around to the trailing unit side, conventionally, a so-called chopper with a wedge-shaped tip has been used, and it is dropped while being suspended by a crane, and the concrete that has gone around is crushed, and then, The crushed concrete was scooped up and removed.

However, the process of raising the chopper and lowering it down had to be repeated, making the crushing work extremely time-consuming, and it also had the disadvantage that solidified concrete parts tended to remain in some areas.

[Problem that the invention seeks to solve]

In view of the above-mentioned points, the present invention is intended to efficiently and reliably crush the concrete portion that has gone around to the trailing unit and solidified.

[Means for solving problems]

The present invention solves the above problems! Concrete crushing is carried out by attaching a driving crusher to one longitudinal end of the support member and a reaction force receiver to the other end in accordance with method 2 of removing concrete from the trailing unit of an underground continuous wall described above. The apparatus is suspended and lowered with the reaction force receiving part along one of the facing walls of adjacent preceding units, and the wraparound concrete on the other facing wall side is discharged and removed from the hole for the succeeding unit. Adopt.

[For production]

In other words, one of the opposing walls of the adjacent preceding units is used as a reaction force receiver and a guide to suspend and lower the driving crushing tool, thereby crushing the rolled concrete on the other opposing wall side.

〔effect〕

Therefore, in order to crush wraparound concrete, it is only necessary to continuously lower the crushing device, which eliminates the need for repeated lifting and lowering as would be required when gravity is used, and the crushing work can now be carried out in a short time and efficiently. .

Moreover, since it is lowered using one of the opposing walls of the leading unit as a guide, the driving crushing tool can go around the concrete part Vζ to ensure good crushing, and the trailing unit is integrated with the leading unit to ensure water-tightness. It has become possible to construct underground continuous walls successfully.

〔Example〕

Examples of the method of the present invention will be described below with reference to the drawings.

A rocking box-21 is installed in each of the underground holes fl) and il+, which are excavated by suctioning and discharging the excavated earth and sand mixed with a stable liquid such as bentonite liquid, at a predetermined distance from the hole.
, +210) and both locking boxes +2
1 and +21, an integrated H-beam steel (tel, +410) is inserted via a reinforcing bar basket (3). (See (a) in Figure 1) Locking box in underground hole tl) +21
+ +2) A ballast (5) is filled as a backfilling material to prevent the concrete from going around, covering a range of approximately 10m below the ground surface from the bottom of the semicircular portion on the outside of each.

(See (b) in Figure 1) Both locking boxes (2) in the underground hole (1) and (1)
), (2) Perform concrete pouring work by injecting cement milk and replacing it with a stabilizing liquid, and then curing and solidifying it and locking box +21
, +2) and construct the preceding unit)tall(6). (Both leading units in Figure 1 (→ see)) il
A hole (7) for the trailing unit is formed by excavating between 1 and 161 while sucking and discharging the excavated soil mixed with a stabilizing liquid. (See Figure 1)) The concrete crushing device (8) is suspended and held by a crane (9), and the reaction force receiver that constitutes the crushing device (8) is
t (I, adjacent preceding unit) +61, tel
The driving crushing tool (6g), which constitutes the crushing device (3), is lowered along one (6a) of the opposing walls (6g), (6b)
U), the concrete that has gone around to the trailing unit hole (7) on the other opposing wall (6b) side and solidified is crushed. (See Fig. 1) After that, the crushed concrete is placed in a clamshell 0'4
Scoop and remove. (See (f) in Figure 1).

Finally, a reinforcing cage (not shown) is inserted into the trailing unit hole (7), and concrete is poured there to construct a 1 m trailing unit. (See (g) in Figure 1.) As shown in Figure 2, the concrete crushing device (8) has a gate-shaped support member (one double-sided frame (14a)).
), (14a).
) is attached thereto, and a driving crushing tool (11) is attached to the outer surface of the other frame (14a).

Opposing frames (14a), (14a) of the support member α
), as shown in FIGS. 2 and 8, width determining guides 05) and (+5) are protrudingly provided on both sides thereof,
It is configured to prevent the crushing device (8) from displacing in the narrow width direction of the underground hole +11 by abutting on both sides of the underground hole (1) in the narrow width direction.

As shown in FIG. 2, the reaction force receiver part 101 is provided with a mounting part 0η for removably attaching the reaction force receiver member (1) as an attachment, and both opposing walls (6a), (
When used in the hole (7) for the trailing unit where the opposing interval of ) is the crushing blade (18) at its tip.
The reaction force receiver is configured to move reciprocatingly in a direction away from the concrete to crush the concrete.

In the above embodiment, the opposing frame (1
4a) and (14a) are each configured to be long in the vertical direction, and a reaction force receiving portion 11O) is provided at the lower end of one of the opposing frames (14a) in a slightly protruding state to absorb the reaction force due to crushing. Even if the support member (I4) is tilted in a diagonal direction, the reaction force receiver does not only tilt the part (lO), but also allows the opposing frame (14a) to come into contact with the opposing wall (6b) of the preceding unit (6). Although the support member (14) is configured to effectively prevent the support member (14) from tilting in the left-right direction, the crushing device is configured such that, for example, a linear arm member is configured as the support member (14), and the support member (14) is tilted in the longitudinal direction. The reaction force receiver on one end side is +1010
), and a driving crushing tool (n) may be attached to the other end, and various structural modifications are possible.

In order to scoop up the crushed concrete from the trailing unit hole (7), it is not limited to the ram shell (12) as described above, but various modifications such as scooping with a suction hose are possible.

The driving crushing tool (II) may move the crushing blade (1@) forward and backward using a hydraulic cylinder.

There may be a plurality of crushing blades (1 to 1).

Shredding blade! The camphor may be provided eccentrically with respect to the center position of the mounting portion, and the mounting portion may be rotated by a hydraulic motor or an electric motor.

A television camera, lighting equipment, etc. may be attached to the concrete crushing device (8).

An overhanging member with an overhang amount adjustment device is provided on the left and right sides of the support member on the side where the drive crushing tool, U) is provided, and each overhang amount adjustment device is installed at a position on the ground and can be remotely controlled. Configure it to
Therefore, the operating position of the driving crushing tool (river) may be configured to be changeable in the thickness direction of the continuous wall.

A separate driving crusher may be attached to the reaction force receiver section 11 (end) of the embodiment described above, and this separate drive crusher may also serve as the reaction force receiver section. In this case, both driving crushing tools can be driven and used simultaneously.

The reaction force receiver of the embodiment shown in FIG. 2 may use a hydraulic cylinder as the member (16). In this case, it is convenient to remotely control the expansion and contraction of this cylinder from the ground. The driving crushing tool may be moved forward and backward relative to the concrete to be crushed by the expansion and contraction of this cylinder.

The support member itself may be configured such that the relative distance between the reaction force receiving portion and the concrete crushing device portion can be changed and fixed, or the drive can be changed. Of course, it would be convenient if the change operation could be performed remotely from the ground.
If the reaction force receiver has a protruding roller rotatable around a horizontal axis at the outer end of the part, it may be possible to make it easier to raise and lower the concrete crushing device smoothly.

[Brief explanation of drawings]

(A) to (G) of FIG. 1 show the steps of the method of the present invention from the construction of the preceding unit to the construction of the succeeding unit.
Each longitudinal sectional view, Figure 2 is an enlarged front view of the crushing device, and Figure 8 is an enlarged front view of the crushing device.
The figure is a side view of FIG. 2, and FIG. 4 is a cross-sectional view showing the construction state of the preceding unit. (6)...Preceding unit, (6a), (6b)
... Opposite wall of preceding unit, (7) ...
・Hole for trailing unit, (8)...Concrete crushing device, (1+)l...Reaction force receiver, 111
)...Drive crushing tool, (1 unit...Supporting member. Agent: Patent attorney Osamu Kitamura 9C

Claims (1)

[Claims] After forming a hole (7) for the succeeding unit by excavating between adjacent units of the underground continuous wall preceding units (6), (6) constructed at a predetermined interval, the hole for the succeeding unit (7) is formed. 7) A method of crushing and removing concrete that has solidified by going around to the side, in which a driving crusher (11) is attached to one horizontal end of the support member (14), and a reaction force receiving part (10) is attached to the other end. ) Concrete crushing equipment (
8), the reaction force receiving part (10) is connected to the opposing walls (6^a), (6^b) of the adjacent preceding units (6), (6).
The wrap-around concrete on the other opposing wall (6^b) side is crushed by the drive crushing tool (11), and then the crushed concrete is used for the trailing unit. A method for removing concrete that goes around the trailing unit of an underground continuous wall and removes it through hole (7).