JP3877817B2 - Excavation sediment transport method in pneumatic caisson - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for carrying out excavated sediment in a pneumatic caisson, and particularly to a method for carrying out excavated sediment in a pneumatic caisson that can smoothly carry out excavated soil.
[0002]
[Prior art]
As shown in FIG. 6, compressed air is supplied to the work chamber 51 of the pneumatic caisson 50 and is kept in a predetermined pressure state. A shaft 54 having a lock 55 at the upper end is connected to the opening 53 of the slab 52 in the work chamber 51.
[0003]
In the work chamber 51, an excavator 56 is provided on the ceiling of the slab 52 via the traveling rail 55, and the excavator 56 can excavate the natural ground G by remote operation. The earth and sand excavated by the excavator 56 is loaded into the earth and sand bucket 57, and is discharged from the lock 55 through the shaft 54 by the earth and sand bucket 57.
[0004]
[Problems to be solved by the invention]
However, in the conventional sediment caulking method in the pneumatic caisson, when excavating the excavator 56 along the traveling rail 55 and excavating the earth and sand in the work chamber 51 as a whole, the excavator 56 and the sediment bucket 57 come into contact with each other. There is a problem that the excavation work is hindered or the earth and sand already loaded in the earth and sand bucket 57 is scattered outside the earth and sand bucket 57.
[0005]
If the earth and sand bucket 57 is evacuated from the movement trajectory of the excavator 56 to solve the above-described problem, there is a problem that the earth and sand carrying-out work becomes complicated accordingly.
The present invention has been proposed in view of the above, and provides a method for carrying out excavated sediment in a pneumatic caisson that can smoothly carry out sediment transport work by preventing contact between the excavator and the sediment bucket. It is in.
[0006]
[Means for Solving the Problems]
The present invention has been proposed to achieve the above object, and is characterized by comprising the following configurations.
That is, the present invention, prior to sinking the pneumatic caisson 1, pre pneumatic and drilling the ground in the vicinity of the shaft 6 immediately below the caisson 1, filled with such material or sand mortar this drilling portion, pneumatic When caisson subsidence excavation is performed, the filler 15 in the drilling portion is excavated to form a sediment bucket installation hole 16, and at the same time as or before or after the formation of the sediment bucket installation hole 16, A drain pit hole 20 is formed in a substantially vertical direction in a state where the outer peripheral periphery overlaps the outer peripheral peripheral part of the hole 10, and the drain pit hole 20 is filled with a material such as mortar or sand. The earth and sand bucket 12 is installed in the bucket installation hole 16, and the earth and sand bucket 12 is loaded with excavated earth and sand, and the earth and sand bucket 12 is transported to the outside of the work room 5. And excavating the filling 21 in the drain pit hole 20 to form the drain pit 22, and draining the ground water W led into the drain pit 22 to the outside of the working chamber 5 through the submersible pump 23. It is characterized by.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating a method for carrying out excavated sediment in a pneumatic caisson according to the basic form of the present invention.
[0008]
In the figure, reference numeral 1 denotes a pneumatic caisson having a circular or rectangular cross section, and a work chamber 5 is provided below the blade 3 of the side wall 2 of the pneumatic caisson 1 and a slab 4 that partitions the upper and lower sides of the pneumatic caisson 1 below. Is partitioned. In the working chamber 5, pressurized air is sent from the atmospheric pressure side via a pump by known means.
[0009]
In the work chamber 5, an excavator 8 that is movable by remote control via a traveling rail 7 provided on the ceiling of the slab 4 is provided. A substantially circular slab opening 4A is formed at a substantially central portion of the slab 4, and a shaft 6 provided in the pneumatic caisson 1 is connected to the slab opening 4A. A lock 9 is attached. Note that the shaft 6 is sequentially added as the pneumatic caisson 1 sinks.
[0010]
An earth and sand bucket hole 10 is formed in a portion of the work chamber 5 facing the shaft 6 of the natural ground G. The earth and sand bucket hole 10 is formed in a substantially vertical direction, and its bottom portion 10A is formed below the lower end portion of the blade edge 3 at the time of final excavation shown in FIG. In the work chamber 5, an earth and sand bucket 12 that can be moved up and down through the shaft 6 via a wire 11 is provided. Although not particularly illustrated, the pneumatic caisson 1 is provided with a shaft for loading / unloading an excavator, a shaft for a worker, a lock, and the like as necessary.
[0011]
Next, the earth and sand carrying-out method in the pneumatic caisson having the above configuration will be described.
Prior to the installation of the pneumatic caisson 1, the ground immediately below the shaft 6, that is, the soft ground 13 facing the shaft 6, and further the rock / consolidated ground 14 are drilled using a drilling machine (not shown). Then, the earth bucket hole 10 is formed in advance. The earth bucket bucket 10 is filled with a filler 15 such as sand, low-strength mortar, or soil mortar.
[0012]
Next, the pneumatic caisson 1 is installed on the soft ground 22. In this installation, the pneumatic caisson 1 is installed so that the central axis of the shaft 6 substantially coincides with the central axis of the earth and sand bucket hole 10. Thereafter, the excavator 8 and other various equipment and facilities required for excavation work are carried into the work chamber 5 by the well-known means via the excavator loading / unloading shaft.
[0013]
Next, the inside of the working chamber 5 is in a pressurized state, and the filler 15 is excavated by using the excavator 8 to form the earth and sand bucket installation hole 16 having a substantially circular cross section. The bucket 12 is stored and installed. In this case, since the filler 15 is formed of low strength mortar or the like, the earth and sand bucket installation hole 16 can be easily formed not only on the soft ground 13 but also on the rock / consolidated ground 14 which is difficult to excavate.
[0014]
The earth and sand bucket installation hole 16 is formed to such a depth that the excavator 8 does not contact the earth and sand bucket 12 when the earth and sand bucket 12 is installed. However, if the earth and sand bucket installation hole 16 is formed too deeply, when the excavator 8 puts the excavation earth and sand into the earth and sand bucket 12, it will hinder the earth and sand bucket installation hole 16. It is preferable to form the earth and sand bucket 12 at a depth that reaches the position where the earth and sand bucket 12 approaches the movement locus of the excavator 8 as long as the earth and sand bucket 12 does not contact the earth and sand bucket 12.
[0015]
The diameter of the earth and sand bucket installation hole 16 is preferably substantially equal to the diameter of the earth and sand bucket 12, but the diameter may be sufficiently larger than the diameter of the earth and sand bucket 12. When the diameter of the earth and sand bucket installation hole 16 is substantially the same as the diameter of the earth and sand bucket 12, the inner surface of the earth and sand bucket installation hole 16 stabilizes the earth and sand bucket 12 when the earth and sand bucket 12 is loaded with excavated earth and sand. Demonstrate the ability to maintain the state.
[0016]
Next, the excavator 8 is moved along the traveling rail 7 to excavate the natural ground G, and the excavated earth and sand are loaded into the earth and sand bucket 12 installed in the earth and sand bucket installation hole 16. In the excavation work by the excavator 8, the earth and sand bucket 12 is located in the earth and sand bucket installation hole 16 and is retracted from the movement trajectory of the excavator 8, so that the excavator 8 is in contact with the earth and sand bucket 12. Therefore, excavation work can be performed smoothly. Further, as described above, since the excavator 8 does not come into contact with the earth and sand bucket 12, the earth and sand bucket 12 tilts or falls, and the earth and sand once loaded in the earth and sand bucket 12 scatters out of the earth and sand bucket 12. There's nothing to do.
[0017]
As the excavation progresses, the earth and sand bucket 12 is filled with excavated earth and sand, and then the earth and sand bucket 12 is pulled out from the earth and sand bucket installation hole 16 and discharged from the lock 9 to the outside through the shaft 6.
[0018]
Before the excavation progresses and the amount of protrusion of the earth and sand bucket 12 from the soft ground 22 (rock / consolidated ground 14) reaches a size where the excavator 8 and the earth and sand bucket 12 come into contact with each other, the excavator 8 The earth and sand bucket installation hole 16 is formed at the same depth as described above. Then, the earth and sand bucket 12 is again installed in the earth and sand bucket installation hole 16, and the above excavation and carry-out operations are repeated until the final excavation state shown in FIG.
Your name, in the case of performing the crushing by fire agents, the space of earth and sand bucket installation hole 16 plays a role of coring, the effect of crushing will be better.
[0019]
FIG. 3 shows an embodiment of a method for carrying out excavated earth and sand in a pneumatic caisson according to the present invention using the basic form . In addition, about the member similar to the said basic form , the same code | symbol is attached | subjected and the description is abbreviate | omitted.
In this embodiment , as shown in FIG. 5, the pneumatic caisson 1 is submerged in the ground where the water level L of the groundwater W in the earth and sand bucket installation hole 16 becomes high. Thus, when the level of the groundwater W is high, the earth and sand bucket 12 in the earth and sand bucket installation hole 16 floats due to the buoyancy of water, and the excavator 8 comes into contact with the earth and sand bucket 12 during excavation. The method is adopted.
[0020]
That is, prior to the installation of the pneumatic caisson 1, the earth and sand bucket installation hole 16 is previously formed in the same manner as in the above example . In the present embodiment, as shown in FIG. 4, prior to the installation of the pneumatic caisson 1, at the same time as or after the formation of the earth and sand bucket installation hole 16, the outer peripheral edge of the earth and sand bucket hole 10 is formed. The drain pit hole 20 is formed in a substantially vertical direction in a state where the outer peripheral edges overlap. The depth of the drain pit hole 20 is formed deeper than the earth and sand bucket hole 16.
[0021]
The drain pit hole 20 is filled with sand, low-strength mortar, or soil mortar, similar to the earth and sand bucket hole 16.
Then, set up a pneumatic caisson 1, as described above, to form a sediment bucket installation hole 16. Further, the filling material 21 such as mortar in the drain pit hole 20 is excavated by the excavator 8, the drain pit 22 is formed deeper than the sediment bucket installation hole 16, and the ground water W in the sediment bucket installation hole 16 is formed. Guide into the drain pit 20. The drain pit 20 can be easily formed because the filler 21 is formed of low strength mortar or the like.
[0022]
Next, a submersible pump 23 is installed in the drain pit 22. In addition, it is preferable to use the submersible pump 23 of the optimal pumping capacity according to the amount of groundwater in the earth and sand bucket installation hole 16. When installing the submersible pump 23, it is a matter of course that the excavator 8 is not in contact with the submersible pump 23.
In a state where the hose 23A of the submersible pump 23 is extended to a drainage pond (not shown) provided on the ground side, the submersible pump 23 pumps up groundwater in the drainage pit 22 and discharges it to the drainage pond. Next, excavation and excavation soil are carried out in the same manner as in the above embodiment, and these steps are repeated until a desired excavation depth is obtained.
[0023]
In the present embodiment, as described above, the groundwater in the earth and sand bucket installation hole 16 is guided to the drainage pit 20 and drained out of the work chamber 5 by the submersible pump 23. Therefore, the earth and sand in the earth and sand bucket installation hole 16 is discharged. The bucket 12 is not lifted by the buoyancy of water. For this reason, the excavator 8 does not contact the earth and sand bucket 12 at the time of excavation, and excavation work can be performed smoothly.
[0024]
Further, as described above, since the ground water W in the work chamber 5 is drained to the outside of the work chamber by the submersible pump 23, a deep well effect can be obtained and the atmospheric pressure in the work chamber 5 can be lowered. For this reason, when a worker enters the work room 5 for inspection or the like, the worker can be prevented from becoming a latent disease, and safety is improved.
In addition, since the groundwater W in the work chamber 5 is drained out of the work chamber 5 by the submersible pump 23, the water level under the blade 3 of the pneumatic caisson 1 is lowered. It becomes easy and less excavation can be done.
Further, in the present embodiment, as described above, the depth of the drain pit hole 20 is formed deeper than the earth and sand bucket hole 16, so by excavating the filler 21 even during the final excavation, drainage pit 20 than can deeper than gravel bucket installation hole 16, effectively Michibikeru groundwater W in sediment bucket installation hole 16 into the drainage pit 20.
[0025]
Moreover, although the present Example demonstrates the case where the single drainage pit hole 20 was provided, according to the amount of groundwater in the earth and sand bucket installation hole 16, etc., multiple are formed and submersible pumps from several places The groundwater may be drained out of the working room.
[0026]
【The invention's effect】
As described above, according to the present invention, the drain pit hole 20 is formed in the outer peripheral peripheral part of the earth and sand bucket hole 10 in a substantially vertical direction with the peripheral peripheral part overlapping, If the subsidence drilling, the earth and sand bucket 12 installed in the soil bucket installation hole 16, the sediment bucket 12 loading excavated soil, excavated earth and sand is unloaded into the working chamber 5 outside through the sediment bucket 12, and said drilling packing 21 of the drainage pit hole 20 forming the drainage pit 22, so as to drain groundwater W that led to the drainage pit 22 via a water pump 23 to the outside of the working chamber 5 since the underground water in the sediment bucket installation hole 16 is drained directed to the pit 20, because it is drained into the working chamber 5 outside the water pump 23, sand in the sand buckets placed hole 16 buckets I never bet 12 or lifted by the buoyancy of the water. For this reason, the excavator 8 does not contact the earth and sand bucket 12 at the time of excavation, and excavation work can be performed smoothly.
Moreover, if the depth of the drain pit hole 20 is formed deeper than the earth and sand bucket hole 16, the drain pit 20 is removed from the earth and sand bucket installation hole 16 by excavating the filler 21 even during the final excavation. Therefore, the ground water W in the earth and sand bucket installation hole 16 can be efficiently guided to the drain pit 20.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view according to one embodiment of a method for carrying out excavated sediment in a pneumatic caisson of the present invention.
FIG. 2 is a cross-sectional view showing a state where FIG. 1 has reached the final excavation.
FIG. 3 is a cross-sectional view according to another embodiment of the excavated sediment transport method in the pneumatic caisson of the present invention.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a cross-sectional view illustrating a state in which the level of groundwater in the earth and sand bucket installation hole is high and the earth and sand bucket floats due to buoyancy.
FIG. 6 is a cross-sectional view for explaining a method for carrying out excavated sediment in a conventional pneumatic caisson.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pneumatic caisson 2 Side wall 3 Cutting edge 4 Slab 4A Opening 5 Work chamber 6 Shaft 7 Running rail 8 Excavator 9 Lock 10 Earth and sand bucket hole 10A Bottom 11 Wire 12 Earth and sand bucket 13 Soft ground 14 Rock and solid ground 15 Filling Material 16 Sediment Bucket Installation Hole 20 Drain Pit Hole 21 Filling 22 Drain Pit 23 Submersible Pump 24 Lock

Claims (1)

Prior to the installation of the pneumatic caisson (1), the ground immediately below the shaft (6) of the pneumatic caisson (1) is drilled in advance, and the drilled portion is filled with material such as mortar or sand, and the pneumatic When caisson subsidence is excavated, the filler (15) in the drilling portion is excavated to form a sediment bucket installation hole (16), and at the same time or before and after the formation of the sediment bucket installation hole (16). Then, a drain pit hole (20) is formed in a substantially vertical direction in a state where the outer peripheral peripheral portion overlaps the outer peripheral peripheral portion of the earth and sand bucket hole (10), and the drain pit hole (20) the such material or sand mortar filling, the earth and sand bucket (12) to sediment bucket installation hole (16) in the assembled and loading excavated earth and sand in the sand bucket (12), the sediment bucket (12) Then, the excavated sediment is carried out of the work chamber (5), and the drainage pit (22) is formed by excavating the filling (21) of the drainage pit hole (20). The drainage pit (22) A method for carrying out excavated sediment to a sediment bucket in a pneumatic caisson, characterized in that groundwater (W) guided into the interior is drained to the outside of the work chamber (5) through a submersible pump (23).

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