JPH026884B2 - - Google Patents

Description

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

When constructing an underground continuous wall advance unit, first, an underground hole is excavated at a predetermined interval, and the excavated soil is sucked out while mixed with a stable liquid such as bentonite liquid. Locking boxes 02, 02 are inserted into both ends of the underground hole 01 in the longitudinal direction, respectively, and a reinforcing bar cage 03 is integrally connected between the two locking boxes 02, 02 by welding using them as guides. Steel 04,
04 is lowered, and then the semicircular hole portions on the end sides of the underground holes 01 of each of the locking boxes 02 and 02 are filled with ballast as a backfilling material to prevent concrete from going around. However, for example, in a layer of coarse sand mixed with gravel or gravel of approximately 25 to 35 m, some parts of both side walls of the underground hole 01 collapse, and the poured concrete unexpectedly wraps around from the outside of the H-beam 04. In some cases, the poured concrete entered the ballast and solidified. If such wrap-around occurs, if you leave it as it is and construct a trailing unit between adjacent preceding units, there is a disadvantage that the water stoppage performance will be reduced in the concrete part that has wrapped around and solidified, and the concrete part that has wrapped around and solidified will It was necessary to remove it.

[Conventional technology]

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

However, the process of raising and dropping the chopper 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 aims to efficiently and reliably crush the concrete portion that has gone around to the trailing unit side and solidified.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention, in the method for removing concrete from the trailing unit of an underground continuous wall described at the beginning, includes attaching a driving crusher to one horizontal end of the support member and attaching it to the other end. A concrete crushing device equipped with a reaction force receiving part is suspended and lowered using one of the opposing walls of the adjacent preceding unit as a guide, and while the reaction force is being applied to one of the opposing walls, The purpose of this invention is to crush the side wrap-around concrete by the driving crushing tool, and then discharge and remove the crushed concrete from the trailing unit hole, and its effects are as follows.

[Effect]

In other words, one of the opposing walls of the adjacent preceding unit is used as a reaction force receiver and a guide to suspend and lower the drive crushing tool while crushing the wrap-around concrete on the other opposing wall side. The wrap-around concrete can be reliably removed over the entire length of the opposing wall with the simple operation of continuously lowering the crushing device, without the need for repeated lifting and lowering operations like when using the gravity of a chopper. It's easy to do.

〔Effect of the invention〕

Therefore, the crushing work can be carried out efficiently in a short time, and since it is lowered using one of the opposing walls of the preceding unit as a guide, the driving crushing tool can go around and work reliably on the concrete part, ensuring good crushing. In the end, it became possible to integrate the trailing unit with the leading unit to ensure a high degree of water-tightness, and to successfully construct an underground continuous wall.

〔Example〕

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

The locking boxes 2, 2 are inserted into the underground holes 1, 1, which are excavated at a predetermined interval while sucking and discharging the excavated soil mixed with a stable liquid such as bentonite liquid, ，
H-shaped steel 4, which is integrated between 2 and 2 through a reinforcing bar cage 3,
Insert 4. (See A in Figure 1) Backfilling is applied to the semicircular hole outward from locking boxes 2 and 2 of underground hole 1, extending approximately 10 meters below the ground surface from the bottom, to prevent concrete from going around. Balas 5 is filled as a material. (1st
(See figure B) Both locking boxes 2 in underground holes 1 and 1,
Concrete work is performed by injecting cement milk between 2 and replacing it with a stabilizing liquid, and then curing and solidifying, and the locking boxes 2, 2 are taken out, and the preceding units 6, 6 are constructed. (See C in FIG. 1) A hole 7 for the trailing unit is formed by excavating the space between the leading units 6, 6 while sucking and discharging the excavated soil mixed with the stabilizing liquid. (See D in Fig. 1) The concrete crushing device 8 is suspended and held by a crane 9, and the reaction force receiving part 10 constituting the crushing device 8 is attached to the opposite wall 6 of the adjacent preceding units 6, 6.
A, 6b is lowered along one side 6a, and the driving crushing tool 11 forming the crushing device 8 crushes the solidified concrete that goes around into the trailing unit hole 7 on the other opposing wall 6b side.
(See E in Figure 1) After that, the crushed concrete is scooped out with Clam Ciel 12 and removed. (See Figure 1) Finally, a reinforcing bar cage (not shown) is inserted into the hole 7 for the trailing unit, and concrete is poured there to construct the trailing unit 13. (See G in FIG. 1) As shown in FIG. 2, the concrete crushing device 8 has the reaction force receiving portion 10 attached to one outer side of both opposing frames 14a, 14a of the gate-shaped support member 14. In addition, a driving crushing tool 11 is attached to the outer surface of the other frame 14a.

Opposing frames 14a, 14 of the support member 14
As shown in FIGS. 2 and 3, width determining guides 15, 15 are protruded from both sides of each a, and the crushing device 8 is brought into contact with both sides of the underground hole 1 in the narrow width direction, respectively. It is configured to prevent displacement in the narrow direction of the underground hole 1.

As shown in FIG. 2, the reaction force receiving part 10 is provided with a mounting part 17 for removably attaching a reaction force receiving member 16 as an attachment. When used in the unit hole 7, the reaction force receiving member 16
It is configured so that it can be dealt with by installing the .

The driving crushing tool 11 has a crushing blade 18 at its tip.
It is configured to drive and reciprocate in a direction away from the reaction force receiving part 10 to crush the concrete.

In the embodiment described above, each of the opposing frames 14a, 14a of the support member 14 is configured to be long in the vertical direction, and the reaction force receiving portion 10 is provided in a slightly protruding state at the lower end of one of the opposing frames 14a. Even if the support member 14 is tilted due to the reaction force being applied in an oblique direction, not only the reaction force receiving portion 10 but also the opposing frame 14a may be applied to the opposing wall 6b of the preceding unit 6.
are in contact with each other to effectively prevent the support member 14 from tilting in the left-right direction.
The crushing device may, for example, be configured with a linear arm member as the support member 14, with the reaction force receiving part 10 attached to one end in the longitudinal direction and the drive crushing tool 11 attached to the other end. , various structural modifications are possible.

In order to scoop up the crushed concrete from the hole 7 for the trailing unit, it is not limited to the above-mentioned clam shell 12, but various modifications such as scooping up using a suction hose are possible.

The driving crushing tool 11 may be one that moves the crushing blade 18 forward and backward using a hydraulic cylinder.

There may be a plurality of crushing blades 18.

The crushing blade 18 may be provided eccentrically with respect to the center position of the attachment portion, and the attachment portion may be rotated by a hydraulic motor or an electric motor.

The concrete crushing device 8 may be equipped with a television camera, lighting equipment, etc.

A projecting member with a projecting amount adjusting device is provided on the left and right sides of the support member on the side where the driving crushing tool 11 is provided, respectively.
Each of the protrusion amount adjusting devices may be provided above the ground and configured to be remotely controllable, so that the operating position of the driving crushing tool 11 can be changed in the thickness direction of the continuous wall.

Another driving crushing tool may be attached to the reaction force receiving part 10 in the embodiment described above, and this separate driving crushing tool may also serve as the reaction force receiving part. In this case, both driving crushing tools can be driven and used simultaneously.

A fluid pressure cylinder may be used as the reaction force receiving member 16 in the embodiment shown in FIG. In this case, it would be convenient if the expansion and contraction of this cylinder could be controlled remotely 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 a roller rotatable around a horizontal axis is protruded from the outer end of the reaction force receiving part, this concrete crushing device may be easily moved up and down smoothly.

[Brief explanation of drawings]

1 to 1 are longitudinal sectional views showing the steps of the method of the present invention from construction of the preceding unit to construction of the succeeding unit, FIG. 2 is an enlarged front view of the crushing device, and FIG. 3 is an enlarged front view of the crushing device. FIG. 2 is a side view, and FIG. 4 is a cross-sectional view showing the construction state of the preceding unit. 6... Leading unit, 6a, 6b... Opposite wall of leading unit, 7... Hole for trailing unit, 8...
Concrete crushing device, 10...Reaction force receiving part, 1
1... Drive crushing tool, 14... Support member.

Claims (1)

[Claims] 1. After forming a hole 7 for the succeeding unit by excavating between adjacent units of the leading units 6, 6 of the underground continuous wall constructed at a predetermined distance, go around to the hole 7 side for the succeeding unit. A method for crushing and removing solidified concrete, the method comprising: supporting member 1;
A concrete crushing device 8 having a drive crushing tool 11 attached to one horizontal end of the concrete crusher 4 and a reaction force receiving part 10 attached to the other end is attached to one of the opposing walls 6a and 6b of the adjacent preceding units 6 and 6. The one opposing wall 6a is suspended and lowered using a guide.
Underground, the wrap-around concrete on the other opposing wall 6b side is crushed by the drive crushing tool 11 while the concrete is being subjected to a reaction force, and then the crushed concrete is discharged and removed from the trailing unit hole 7. Method for removing wraparound concrete from continuous wall trailing unit.