JPS6149021A - Underground continuous wall work - Google Patents

Abstract

PURPOSE:To easily excavate a trench by a method in which an excavator is set in a vertical trench formed on the side of an underground buried object, and the excavator is turned toward the side of the buried object to make its attitude horizontal state and lowered. CONSTITUTION:When the motor 13 of an excavator 7 set in a vertical trench 5 is operated, the drive force is transmitted to an excavating part 10 and a screw 20 is turned around a cylinder 19. At the same time, when an oil-pressure cylinder 16 is operated, the cylinder 16 is turned around a support shaft 14 toward the direction of arrow A, and the part 10 is turned 90 deg. toward the side of an underground buried object 4. The ground below the object 4 is excavated by the chip 21 of the screw 20. The part 10 is again positioned vertically, the excavator 7 is moved to below the trench 5, and the part 10 is again positioned horizontally for excavation. The same operations are repeated to excavate a trench 26 below the object 4.

Description

[Detailed Description of the Invention] a. Industrial Field of Application The present invention forms an underground continuous wall by repeating the process of excavating a vertical trench underground and then injecting and solidifying concrete material into the vertical trench. Regarding the underground continuous wall construction method,
In particular, the present invention relates to a method for excavating the lower part of an underground object, such as a sewer pipe or gas pipe, when the object crosses a part of a vertical trench.

b. Prior art In recent years, when constructing concrete structures underground in urban areas, it is desirable to do so without generating noise or vibration, and for these reasons, underground continuous wall construction methods such as those mentioned at the beginning have been developed. is being developed.

However, in the conventional underground continuous wall construction method, a simple vertical trench excavation method is adopted, so when underground objects such as sewage pipes and gas pipes cross a part of the vertical trench, it is necessary to Although it is possible to excavate that part, it was not possible to excavate the part below it. For this reason, there is a problem in that it is not possible to form a vertical groove that extends below the underground object and has a predetermined depth.

OBJECT OF THE INVENTION The present invention was invented in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for easily excavating the lower part of an underground object.

d0 Structure of the Invention The present invention is characterized by an underground continuous wall construction method in which a vertical trench is excavated underground, and then the process of injecting and solidifying concrete material into the vertical trench is repeated to form an underground continuous wall. , when an underground object crosses a part of the vertical trench,
guiding an excavation device into a vertical groove formed adjacent to the underground object, and arranging an excavation member provided on the excavation device substantially vertically so as to face a lower part of the underground object; Next, the excavation member is rotated toward the underground object under an excavation operation state to be in a horizontal state, and further moved downward under the horizontal state, so as to reach the lower part of the underground object. The reason is that a slot is formed.

e. Example Figures 1 to 3 are for explaining the underground continuous wall construction method according to the present invention.

First, a vertical groove 3 having a predetermined width and a predetermined length is excavated along the contour 2 of the area 1 to be excavated, and concrete material is poured into the vertical groove 3 and solidified. Next, another vertical groove 3 is formed so as to be continuous with the above-mentioned vertical groove 3, and concrete material is poured into this other vertical groove 3 and solidified. By repeating these steps, a solidified mud layer or a continuous concrete wall along the contour 2 is constructed, and then,
The area 1 surrounded by this continuous wall is excavated to a predetermined depth.

As shown in Figure 1, if there are underground objects 4 such as sewage pipes or gas pipes in a part of the vertical trench to be excavated, normal excavation will be performed on both sides of the underground objects 4.

After forming the vertical groove 5, the lower part 6 is excavated by an excavating device 7, which will be described later.

As shown in FIG. 3, the excavating apparatus 7 used in this embodiment is composed of an apparatus main body 9 and an excavating member 10 rotatably attached to the apparatus main body 9. The device main body 9 described above includes a rotating member 12 that is rotatably mounted around a support shaft 11, a hydraulic motor 13 that is fixed to this rotating member 12, and one end of which is rotatable around the support shaft 14. and a hydraulic cylinder 16 whose other end is rotatably attached to a support shaft 15 implanted in the rotary member 12, and the excavating member 10 is integrated with the rotary member 12. installed. Further, the device main body 9 is provided with a plurality of rollers 17 and a pulley 18 rotatably provided.

On the other hand, the excavating member 10 is constructed by attaching a spiral screw 20 around a cylindrical portion 19, and the outer edge of the screw 20 has a thread of 8 per pitch over the entire area to facilitate excavation. The chips 21 are fixed by welding or the like. Further, at the tip of the excavating member 10,
As shown by the imaginary line in FIG. 3, the guide member 22 is detachably attached.

Next, a method for excavating the lower part 6 of the underground object 4 using the above-mentioned excavation device 7 will be described.

First, vertical grooves 5 are formed in advance on both sides of the underground object 4, and the H-shaped steel 23 is vertically arranged and fixed in one of the vertical grooves 5 as shown in FIGS. 2 and 3. Then, the excavating device 7 is suspended from a crane (not shown) via a rope 24 installed on the pulley 18, and the rollers 17 are secured to the H-shaped steel 23. Thereafter, the crane is operated to move the excavation device 7 downward while being guided along the H-section steel 23. At this time, the excavating member 10 is arranged vertically as shown by the solid line in FIG. 3, and the guide member 22 is not attached to its tip.

When the excavating member 10 reaches the position corresponding to the lower part 6 of the underground object 4, the downward movement of the excavating device 7 is stopped,
Activate the motor 13. Accordingly, the driving force of the motor 13 is transmitted to the excavating member 10 via a deceleration and transmission mechanism (not shown), and the screw 20 is rotationally driven around the cylindrical portion 19. When the hydraulic cylinder 16 is operated in synchronization with this, the hydraulic cylinder 16 rotates in the direction of arrow A around the support shaft 14 as shown by the imaginary line in FIG. 10 is rotated by approximately 90° in the direction of arrow B, that is, toward the underground object 4.

At this time, as the screw 20 rotates, a large number of chips 21 welded to the screw 20 effectively excavate the lower part 6 of the underground object 4 .

The excavated soil will be discharged to the ground using a suction device not shown.

Thereafter, the excavating member 10 is moved back to the vertical position again by the motor 13, the excavating device 7 is lifted up by a crane, and the guide member 22 is attached to the tip of the excavating member 10.

Then, the excavating device 7 is moved forward into the vertical groove 5 again, and the excavating member 10 is rotated by 90'' in the direction of the arrow B. As a result, the guide member 22 is placed in the other vertical groove 5. Ru.

Under this condition, the motor 13 is driven to screw the screw 2.
While rotating the excavator 7, the H-shaped steel 23 and the rollers 17. and the guide member 22 and the other vertical groove 5
It is lowered to a predetermined depth position by the guiding action of. As a result, a groove 26 of a predetermined depth is formed in the lower part 6 of the underground object 4.
is formed. After this, the excavating device 7 is moved back and removed from the vertical groove 5.

Next, the H-shaped steel 23 is removed from the vertical groove 5, and the underground structure 4 is removed.
When concrete material is injected into the vertical grooves 5 formed on both sides of the underground structure 4, the material is poured into the groove 2 formed below the underground structure 4
6 and into the slots formed above it, respectively, and solidified.

By employing the above method, it becomes possible to reliably excavate the lower part 6 of the underground object 4, which could not be excavated conventionally, and a perfect continuous wall can be constructed. Therefore, it is possible to reliably prevent landslides in the contour 2 portion of the region 1 to be excavated.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment described above, and various modifications and changes can be made based on the technical idea of the present invention.

For example, in the embodiment described above, the guide member 22 is attached to the tip of the excavating member 10 after rotational excavation by 90 degrees, but the guide member 22 is attached to the tip of the excavating member 10 as shown in FIG. The conical digging tool 28 having the protrusion 27 may be integrally attached from the beginning. In this case, the descending of the excavating member 10 can be started immediately after the 90° rotation excavation, and the work efficiency can be improved.

10 Effects of the Invention As described above, the present invention provides a horizontal excavator by placing an excavator in a vertical groove formed on the side of an underground object, and rotating the excavating member toward the underground object while operating the excavator. Since the method of the present invention is designed to form a groove in the lower part of the underground object by lowering it in the horizontal state, Also, slots can be formed with extremely easy operations, and concrete materials can be poured and hardened. Therefore, a complete continuous wall can be easily constructed, and landslides during excavation can be more effectively prevented.

[Brief explanation of the drawing]

1 to 4 are for explaining the underground continuous wall construction method according to the present invention, and FIG. 1 is a schematic perspective view showing a vertical trench formed underground and an underground object, respectively; Figure 2 is a plan view of the underground structure and the vertical trench adjacent to it, Figure 3 is a sectional view taken along the line ■-■ in Figure 2, and Figure 4
The figure is a side view showing an example in which an excavating tool is integrally attached to the tip of an excavating member. 1...Area to be excavated, 2...Outline, 3.
...Vertical trench, 4...Underground objects, 5.
...Slot hole, 6...Lower part, 7.
...Drilling equipment, 10...Drilling components, 13
...Motor, 16...Hydraulic cylinder, 20...Screw, 21...Tip, 26...Slot hole, 28...Drilling tool.

Claims (1)

[Claims] In an underground continuous wall construction method in which an underground continuous wall is formed by repeating the process of injecting concrete material into the vertical groove and solidifying it after excavating a vertical groove underground, a part of the vertical groove is buried underground. When an object crosses, guiding an excavation device into a vertical trench formed adjacent to the underground object,
An excavating member provided on the excavating device is arranged substantially vertically so as to face a lower part of the underground object, and then the excavating member is rotated toward the side of the underground object under excavation operation. An underground continuous wall construction method characterized in that a groove hole is formed in the lower part of the underground structure by moving the structure horizontally and then moving it downward in a horizontal state.