JPH09111769A - Underwater caisson excavating method and excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly control a degree of settling of a case body by storing excavated sand and the like or water in a load chamber and adjusting settling force of the case body. SOLUTION: Excavated sand and the like or water is stored in a load chamber 112 composed of the bottom part partition wall 106, the circumferential wall 110 and the hollow partition wall 108 of a case body 102 and settling force of the case body is adjusted. In order that the water level in a facing 116 composed of the space and the hollow partition wall downward of the bottom part partition wall 106 of the case body 102 may be under pressure resisting ground pressure or water pressure at the time of excavating, buoyancy is produced for the case body so as to be under pressure resisting the settling force of the case body 102 in the case where the settling force of thereof is large. And stability of the facing 116 and the settling force of the case body 102 is adjusted and excavated. Accordingly, even if resistance force resisting the case body 102 is changed, the case body 102 can be exactly stably settled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caisson construction method in which a shaft or underground structure is submerged in the soil, and more particularly to an underwater caisson excavation method and an excavating apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, a method called a pneumatic caisson method has been widely used as a caisson method. This method is
A work chamber is provided at the excavation part at the lower end of the concrete cylindrical body, and the air pressure inside the excavation part is made to act against the ground pressure or water pressure of the excavation part, stabilizing the face and excavating work It is a construction method to implement. In this construction method, a general-purpose excavator or tool can be used as an excavation device, but it is not preferable in terms of health management of workers because it requires work under high pressure.

Therefore, as described in Japanese Patent Application Laid-Open No. HEI 2-112525, excavator automation or remote control has been conventionally performed. When unloading the machine or the like, the operation was performed under high pressure, and the same problem as described above occurred.

[0004] In view of the current situation, another method developed in recent years is called an open caisson method.
In this method, water is collected inside the building with a head that opposes pressure and underwater excavation is performed.

However, in either case,
When the building is settled, depending on the geological conditions, the amount of extra excavation, the change in frictional resistance due to the effects of the straightness of the body, the strength of the ground, etc., the body may be difficult to settle or may cause excessive settlement. Therefore, in general, when the skeleton sinks down by a certain amount, the formwork is assembled, the concrete is poured and hardened, and the skeleton block is added. However, this operation becomes impossible or difficult.

As a countermeasure, as disclosed in Japanese Patent Application Laid-Open No. 2-282521, the frame is hung by a jack installed on a scaffold-like support stand, or a ground anchor near the surface of the ground is installed, and the anchor reaction force is increased. However, since large-scale facilities are required and the effect of the anchor is particularly limited, it greatly affects the construction period and costs, which is not economically favorable. Had become something.

Further, Japanese Patent Laid-Open No. 4-49325 discloses a method in which excavated earth and sand in a caisson is carried out from an opening of a skeleton and placed on the skeleton, and the caisson is submerged by its weight. In this case, it is constructed so as to counter the water pressure or the ground pressure of the excavating portion, which is not preferable when excavating deep in the ground.

[0008] On the other hand, in general, when a certain amount of the frame sinks,
In order to reinforce the building blocks, assemble the formwork, cast concrete, wait for hardening, and perform the next excavation and subsidence.However, in the pneumatic caisson method, excavation is performed during this rebuilding work of the building blocks. It was difficult to remove the machine and use it to drill another adjacent caisson.

In the open caisson method,
There are those that fix the excavator to the frame using a frictional force such as a clipper, and those that fix the excavator using a guide rail or the like, as disclosed in JP-A-4-27098.
In many cases, the excavator falls down or cannot be removed in the event of failure or power outage.

The present invention has been made in view of the above-described circumstances, and does not require work under high pressure, stabilizes the face even when the resistance to the skeleton changes, and enables the sinking of the skeleton to be accurately controlled. An object of the present invention is to provide an underwater caisson excavation method that can be settled stably and surely.

It is another object of the present invention to provide an underwater caisson excavator capable of accurately fixing an excavator at a predetermined position of a skeleton in the above-described underwater caisson excavation method. It is still another object of the present invention to provide an underwater caisson excavator capable of reliably and automatically recovering an excavator without manual high-pressure work in an emergency such as a failure or power failure of the excavator.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems and objects of the prior art described above, and a bottom partition wall is formed in the vicinity of the bottom of a cylindrical body to be buried in the ground. A submerged caisson excavation method in which a cylindrical hollow partition is erected in the opening provided in the center of the partition, and an excavator is disposed near the bottom in the hollow partition to perform excavation. The bottom partition wall of the skeleton, a load chamber which is a space formed by the outer peripheral wall and the hollow partition, excavated earth or sand or the like is stored to store the water or excavated so as to adjust the sinking force of the skeleton. It is an underwater caisson excavation method.

Further, the present invention is such that the water level in the face composed of the space below the bottom partition wall of the skeleton and the inside of the hollow partition wall becomes a pressure against earth pressure or water pressure during excavation, or the sinking force of the skeleton structure. When the water pressure is large, a pressure is applied to counteract the sinking force of the skeleton, causing buoyancy to the skeleton, and excavating by adjusting the stability of the face and the sinking force of the skeleton. The caisson excavation method.

The present invention also relates to an underwater caisson excavating device used in the above-mentioned underwater caisson excavating method, wherein an engaging device is provided on the outer periphery of the excavator, the hollow partition wall is cylindrical, and the lower end thereof is formed. The inner wall in the vicinity is provided with a fitting protrusion at a position corresponding to the engagement device, and the engagement device of the excavator and the fitting protrusion of the hollow partition wall are engaged with each other to thereby position the excavator with respect to the body. The underwater caisson excavator is characterized in that its posture can be accurately controlled.

Further, according to the present invention, the upper engagement contact piece of the excavator is automatically disengaged from the upper fitting protrusion of the hollow partition in an emergency such as a failure of a control device or the like. It is an underwater caisson drilling rig characterized in that

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a vertical sectional view for explaining the outline of the first embodiment of the underwater caisson excavation method of the present invention.
In, 100 indicates an underwater caisson drilling system as a whole. The underwater caisson excavation system 100 is basically composed of a tubular concrete skeleton 102 to be buried under the ground G, and an excavator 104 arranged near the lower end of the skeleton 102.
It is composed of

More specifically, a bottom partition 106 is formed near the bottom of the skeleton 102, and a central opening 109 is provided in the center thereof. Then, on the bottom partition wall 106 around the opening 109, a cylindrical hollow partition wall 108 is formed.
Is erected and fixed. Further, in the vicinity of the bottom of the hollow partition wall 108, the excavator 104 suspended by a wire or the like (not shown) and descending in the hollow partition wall 108 is fixed at a predetermined position by an appropriate means. . As the excavator 104, a conventionally known backhoe type excavator or an arm type rod header type excavator can be used, but the excavator 104 is not particularly limited.

After the ground G1 near the lower end of the skeleton 102 is excavated to some extent by the excavator 104, the skeleton 102 is lowered and advanced downward, and another skeleton block is cast at the upper end of the skeleton 102, that is, at the rear end. Then, a process such as an excavation operation is repeated again, and the skeleton 102 is buried deep underground to construct a shaft or an underground structure. It is to be noted that the hollow partition block is connected to the upper end of the hollow partition 108 in the same manner as the casting of the skeleton block.

In this case, excavated earth and sand or water is stored in a load chamber 112 which is a space formed by a bottom partition 106, an outer peripheral wall 110 and a hollow partition 108 of the frame 102, and the water level A thereof is adjusted. Then, the sinking force of the frame 102 is adjusted by its weight.

In the face 116 formed by the space 114 below the bottom partition 106 of the frame 102 and the inside of the hollow partition, a water level higher than the groundwater level and a ground pressure at the time of excavation or a pressure level against the water pressure is set. The stability of the face 116 and the sinking force of the frame 102 are adjusted by giving the water level B as much as possible.

Further, the water level in the face 116 is the body 102.
When the sinking force of the skeleton is large, a pressure against the sinking force of the skeleton 102 is applied to cause buoyancy to the skeleton of the skeleton 102.
It is designed to adjust the sinking force of.

As described above, the load chamber 1 formed in the body 102
Since the water level A in 12 is adjusted to adjust the weight of the skeleton 102 and the water level in the cutting face 116 is adjusted to adjust the cutting face water pressure, excavation is performed, so that the cutting face 116 is stable,
It is possible to adjust the buoyancy with respect to the skeleton 102 and the sinking force of the skeleton 102.

Accordingly, even if the resistance force to the subsidence of the skeleton 102 due to the geological conditions, the amount of excess digging, the straightness of the skeleton, etc. changes, the subsidence work of the skeleton 102 can be performed reliably and accurately.

FIG. 2 is a vertical cross-sectional view for explaining the outline of a second embodiment of the underwater caisson excavation method of the present invention, in which 100 is added to the same constituent members as in the first embodiment. Indicated by reference numbers.

In this embodiment, since the weight of the skeleton 202 is larger than the pressure inside the cutting face 216 at the start of caisson excavation, and in order to stabilize the posture of the skeleton 202, a tower-like support fixed to the ground is provided. Multiple jacks 22 on stand 218
0 and 220 are provided, and the body 202 is suspended via the jacks 220 and 220. The jacks 220, 220 are connected to a hydraulic device (not shown), and load (pressure) detectors 222, 222 for detecting the load applied to the jack 220 are provided in the pipeline.

On the other hand, pumps 224 and 226 are provided in the load chamber 212 and the face 216, respectively, and are connected to a separately provided tank 232 for storing water via pipelines 228 and 230 connected to the pumps, respectively. The water in the chamber 212 and the face 216 is circulated to the tank 232. Further, the water in the storage tank 232 is supplied via pumps 234 and 236 provided in the storage tank 232, and via conduits 238 and 240, respectively. Each is supplied into the load chamber 212 and the face 216. These constitute a pump device.

In this case, this pump device allows the load applied to the jack detected by the load (pressure) detector 222 provided in the jack 220 to reach a preset value. Drilling is performed by adjusting the water level in 212 and / or face 216.

By the way, in this adjustment, as shown in FIG. 3, the adjustment may be made according to the following formula 1.

[0030]

(Equation 1)

That is, the water level adjustment (ω) of the load chamber 212 is mainly used for the adjustment, and the face 216
The water pressure P of the inner, slightly higher pressure than the groundwater pressure P ₀ is to excavate as the lowest.

Even if the water level in the load chamber 212 becomes zero (ω = 0), the pressure P inside the face 216 rises when the load of the jack 220 exceeds the set range in the direction in which the jack extends. In order to increase the buoyancy of the skeleton 202, the water level of the face may be adjusted so as to increase and then excavated.

FIG. 4 is a vertical cross-sectional view of the underwater caisson excavator used in the underwater caisson excavation method of the present invention described above.

In FIG. 4, reference numeral 300 generally indicates an underwater caisson excavator. Underwater caisson drilling rig 300
As in the above-described embodiment, a cylindrical concrete skeleton 302 sunk and buried underground G is provided.In the vicinity of the bottom of the skeleton 302, a bottom partition 306 is formed and in the center thereof, A circular central opening 309 is provided. On the bottom partition 306 around the opening 309, a cylindrical hollow partition 308 is erected and fixed.

In this case, the bottom partition wall 306, the outer peripheral wall 310, and the hollow partition wall 308 of the skeleton 302 are the same as in the above-described embodiment.
The excavated earth and sand or water is stored in the load chamber 312, which is a space portion formed by and, the water level A is adjusted, and the sinking force of the skeleton 302 is adjusted by its weight.
The space 114 below the bottom partition wall 306 of 02 and the face 116 composed of the inside of the hollow partition wall are provided with a water level B that is higher than the groundwater level and is at a pressure level that opposes the ground pressure or water pressure during excavation. Further, the water level in the face face 116 is such that when the sinking force of the skeleton 302 is large, the water level becomes a pressure that opposes the sinking force of the skeleton 302, causing the skeleton 302 to have buoyancy with respect to buoyancy, Stability of face 116 and structure 3
The sinking force of 02 is adjusted.

Further, 304 is an excavator, and the excavator 304 is
A cylindrical shell frame member 320 having an outer diameter smaller than the inner diameter of the hollow partition wall 308, and a bearing 32 inside the shell frame member 320.
A rotation device 326 rotatably mounted via 2,324 is provided. The rotating device 326 is rotatable by a driving force of a driving motor 323 provided on the intermediate frame member 321 of the shell frame member 320. Further, a pivot arm 330 is pivotally connected to one lower end of the rotation device 326 via a pin 328, and a pin 3 is attached to one lower end of the rotation device 326.
The tip of the arm drive jack 334 connected by the link 32 is linked to the side of the revolving arm 330 via a pin 336, and the rod 334a of the arm drive jack 334 protrudes and is shown by the dashed line in FIG. As described above, the swing arm 330 can swing. An excavator 338 is mounted on the tip of the swing arm.

In the case of this embodiment, the excavator is
As 338, a type in which the cutter head 340 excavates by rotating by the motor 342,
As long as the excavator has an action of loosening the ground, other devices can be used.

Reference numeral 360 is a sludge discharge pipe, which is an excavator 304.
One end of the excavator 338 is opened near the back surface of the cutter head 340, penetrates the center of the excavator 304, and the other end is connected to the outside of the body via the pump 362.

By the way, this excavator 304 is
It is necessary to be suspended from the ground by the wire 325, descend inside the hollow partition 308, and be fixed at a predetermined position near the bottom of the hollow partition 308. In this case, the inner wall of the hollow partition 308 is shown in FIG. As described above, the guide members 344, 344 are formed in the longitudinal direction, and also in the outer wall of the shell frame member 320 in the longitudinal direction, at the positions corresponding to these guide members 344, 344, the sliding members 346, 346 are provided in the longitudinal direction. When the excavator 304 moves up and down in the hollow partition 308, the posture of the excavator can be accurately controlled.

Further, as shown in FIG.
As shown in FIG. 6 (a), a plurality of lower fitting contact pieces 348, 348 are provided on the inner wall near the lower end of the hollow partition wall 308, and in the middle of the hollow partition wall 308. As shown in (b), a plurality of upper fitting contact pieces 350, 350 are provided at positions different from those of the lower fitting contact piece 348 in the circumferential direction and spaced apart by a predetermined angle. In addition, the inclined surface 3 of this lower fitting contact piece 348
The 48a and the inclined surface 350a of the upper fitting contact piece 350 are configured so as to have a gradient in a direction facing each other.

On the other hand, on the outer peripheral wall 321 of the shell frame member 320 of the excavator 304, as shown in FIG. 6 (a), the lower fitting contact piece of the hollow partition wall 308 is separated by a predetermined angle near its lower end. A plurality of lower engaging contact pieces 352, 352 are provided at positions corresponding to 348. Note that the inclined surface of the lower engagement contact piece 352 has an opposite inclination to the inclined surface 348a of the lower engagement contact piece 348.

Further, the inclination angle of these inclined surfaces is determined by the excavator.
When the excavator 304 descends, it is an angle at which it slides toward the center when it descends, and it is an angle at which the posture of the excavator 304 can be accurately controlled. Preferably, the angle is such that the machine 304 can be easily pulled upward.

Further, in the vicinity of the upper end of the shell frame member 320 of the excavator 304, at a position corresponding to the upper fitting contact piece 350 of the hollow partition wall 308, the drive jack 354 provided on the intermediate frame member 321 of the shell frame member. A movable contact piece 358 is provided which is connected to the link 356, protrudes by the projection of the rod 354a of the drive jack 354, and engages with the upper fitting contact piece 350 of the hollow partition wall 308.

With this structure, when the excavator suspended by the wire 325 is lowered from the ground, the guide members 344 and 344 provided on the hollow partition wall 308 and the sliding members 346 and 346 provided on the outer wall of the shell frame member 320 are provided. By the action
The posture of the excavator can be accurately controlled when descending inside the hollow partition wall 308 of the excavator 304. Also, the lower fitting contact piece 348 of the hollow partition 308 is
The excavator 304 is fixed at a predetermined position of the hollow partition 308 by the engagement of the lower engagement contact piece 352 of the shell frame member 320 having an inclined surface with a reverse slope and the upper end of the shell frame member 320 of the excavator 304. Since the movable contact piece 358 provided in the vicinity is projected by the action of the drive jack 354 and is press-engaged with the upper fitting contact piece 350 of the hollow partition wall 308, the lower fitting contact piece 348 and the lower engagement piece are further engaged. Engagement of the joint piece 352 becomes tight and the excavator
The 304 can be accurately fixed in place on the hollow partition 308.

FIG. 7 (a) is a schematic diagram showing an embodiment of the drive jack 354 for causing the movable contact piece 358 to move in a protruding manner. In the event of an emergency such as a failure of the hydraulic control device of the drive jack 354 or the like. At this time, the hollow partition wall 308 is configured to be automatically disengaged from the upper fitting contact piece 350, and the pressure oil from the pump 406 is accumulated through the conduit 408.
400, and if any failure occurs, the solenoid valve 4
When 04 stops working, switch the solenoid valve 402,
The pressure oil is sent to the conduit 410, the rod 354a of the drive jack 354 is retracted, and the movable fitting 358 and the upper fitting piece 350 of the hollow bulkhead 308 are connected.
Is automatically released, and the excavator 304 suspended by the wire 325 from the ground can be taken out of the skeleton.

FIG. 7 (b) is a schematic view showing another embodiment of the structure for automatically releasing the drive jack 354, in which the drive jack 354 is provided with a spring member 354b and a movable contact piece 358 is provided. The engagement between the hollow partition wall 308 and the upper fitting contact piece 350 is automatically released.

FIG. 8A is a schematic view showing an embodiment of a structure for automatically releasing the arm driving jack 334. In an emergency such as a failure of the hydraulic control device of the arm drive jack 334, the protrusion of the rod 334a of the arm drive jack 334 is released, and the swing arm 330 is automatically moved as shown by a dashed line in the center of FIG. It is configured to return to the center position of the skeleton, so that the excavator 3
The 04 is constructed so that it can be taken out of the body through the hollow partition 308. In this case, the configuration is as shown in FIG.
It has the same accumulator 500 as in (a), and the pressure oil from the pump 506 is stored in the accumulator 500 via the pipe line 508, and the electromagnetic switching valve 504 operates due to some failure. When it disappears, the solenoid valve 502 is switched, pressure oil is sent to the pipe line 510, the rod 334a of the arm drive jack 334 is pulled in, and the excavator 304 suspended by the wire 325 from the ground can be taken out to the outside of the body. Is.

Further, FIG. 8 (b) shows this arm drive jack.
FIG. 9 is a schematic view showing another embodiment of the configuration of automatic release of 334, in which a spring member 334b is arranged in the arm drive jack 334 so that the rod 334a of the arm drive jack 334 is automatically pulled in. .

9 and 10, the arm drive jack 334 is provided with an angle detection device 330a composed of a sensor, while the rotating device 326 is provided with a rotation angle detection device 326b composed of a sensor. Based on the value, the excavation range can be controlled by a separately provided arithmetic processing unit (not shown).

FIG. 11 shows an example of the sludge discharge pipe 360. The length and bending amount of the sludge discharge pipe 360 are changed in accordance with the turning of the turning arm 330 to form a smooth curve. The outer pipe 364, the inner pipe 366 slidably inserted therein, and the flexible pipe connected to the inner pipe 366 so that the sludge removal operation is smoothly performed.
It is composed of 368 and.

FIG. 12 shows another embodiment of the sludge discharge pipe 360, in which the outer pipe 364 'and the inner pipe 366' are arranged in the opposite manner to the above embodiment.

[0052]

In the underwater caisson excavation method according to the present invention, the excavated earth or sand or water is stored in the load chamber, which is a space formed by the bottom partition wall, the outer peripheral wall and the hollow partition wall of the skeleton. The excavation is performed by adjusting the sinking force of the structure, and the water level in the face composed of the space below the bottom partition wall of the body and the inside of the hollow partition wall is adjusted to a pressure that opposes the earth pressure or water pressure at the time of excavation. When the sinking force of is large, the pressure is set to oppose the sinking force of the body,
Buoyancy is generated in the body, and the excavation is performed by adjusting the stability of the face and the sinking force of the body.

Therefore, by adjusting the amount of water in the load chamber and / or the face pressure, it is possible to accurately control the subsidence of the skeleton by adjusting the load of the skeleton, so that even if the resistance to the skeleton changes, The face is stable, and the sinking of the skeleton can be performed accurately, stably and surely. Therefore, it is possible to perform economical construction without requiring work under high pressure, without disturbing the working process, and without requiring large-scale equipment such as an anchor device and a skeleton press-fitting device.

According to the present invention, in the underwater caisson excavation method described above, the hollow partition is cylindrical, and a fitting projection is provided on an inner wall near a lower end thereof at a position corresponding to the engaging device. An underwater caisson excavator in which the position and posture of the excavator with respect to the skeleton can be accurately controlled by engaging the engagement device of the excavator with the engagement protrusion of the hollow bulkhead. An underwater caisson excavator capable of accurately fixing a machine at a predetermined position of a frame can be provided.

Further, in the underwater caisson excavator of the present invention, the upper engagement contact piece of the excavator is automatically engaged with the upper fitting protrusion of the hollow partition in an emergency such as a failure of the control device. Since it is configured to be released,
(1) The excavator can be operated remotely, and can be easily collected in the event of an emergency such as a malfunction, and maintenance can be performed on the ground, so difficult work under high pressure can be avoided. (2) The excavator can be easily collected. Therefore, it can be used for excavating the adjacent caisson during the skeleton replenishment work. Therefore, the machine can be effectively used, and the machine cost can be reduced. Therefore, the excavation cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view for explaining the outline of a first embodiment of an underwater caisson excavation method of the present invention.

FIG. 2 is a vertical cross-sectional view for explaining the outline of a second embodiment of the underwater caisson excavation method of the present invention.

FIG. 3 is a view for explaining a method of adjusting a water level in a load chamber and / or a face in the underwater caisson excavation method of the present invention.

FIG. 4 is a longitudinal sectional view of an underwater caisson excavator used in the underwater caisson excavation method of the present invention.

FIG. 5 is a partially enlarged view showing an engaged state of the excavator of the underwater caisson excavator of the present invention.

6A is a view taken along the line II of FIG. 4, and FIG. 6B is a view taken along the line II-II of FIG.

FIG. 7 is a schematic view showing an embodiment of a drive jack for moving a movable contact piece to protrude.

FIG. 8 is a schematic view showing an embodiment of a configuration of automatic release of an arm driving jack.

FIG. 9 is an enlarged cross-sectional view of a rotating device.

FIG. 10 is an enlarged sectional view of an arm driving jack.

FIG. 11 is a partially enlarged cross-sectional view of one embodiment of the exhaust pipe of the present invention.

FIG. 12 is a partially enlarged sectional view of another embodiment of the drainage pipe of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 underwater caisson drilling system 102 skeleton 104 excavator 106 bottom partition 108 hollow partition 110 outer peripheral wall 112 load chamber 116 face face 212 load chamber 216 face face 218 support cradle 220 jack 220 load detection Container 300 ... Underwater caisson excavator 302 ... Body 304 ... Excavator 306 ... Bottom partition wall 308 ... Hollow partition wall 320 ... Shell frame member 323 ... Drive motor 325 ... Wire 326 ... Rotating device 326b ... Rotation angle detecting device 328 ... Movable contact piece 330 ... Slewing arm 330a ... Angle detection device 330b ... Spring member 334 ... Arm drive jack 338 ... Drilling device 340 ... Cutter head 342 ... Motor 344 ... Guide member 346 ... Sliding member 348 ... Lower fitting contact piece 350 ... Upper fitting contact Piece 352: lower engagement contact piece 354: drive Jack 354b ... spring members 358 ... movable contact piece 360 ... Haidorokan 362 ... pump 364,364 '... outer tube 366,366' ... inner tube 368 ... flexible tube 400 ... accumulator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Matsuyama 2-3-24 Yokota, Atsuta-ku, Nagoya-shi, Aichi Chubu Electric Power Co., Inc. Central Transmission and Substation Construction (72) Inventor Junichiro Omori Yokota, Atsuta-ku, Nagoya-shi, Aichi Chuo Electric Power Co., Inc. Chuo Electric Power Transmission Substation Construction Center (72-3) 24 Inventor Susumu Nasu 2-19-1 Nishiki, Naka-ku, Nagoya-shi, Aichi Incorporated company Konoikegumi Nagoya Branch (72) Inventor Susumu Saka Aichi 2-19-1, Nishiki, Naka-ku, Nagoya-shi, Nagoya, Ltd. Inside the Konoike set Nagoya branch (72) Inventor, Kyoyoshi Ishikawa 3-6-1 Kitakyuji-cho, Chuo-ku, Osaka-shi, Osaka (72) Invention Person Kozo Sakoi 1-3 1-3 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe headquarters (72) Inventor Koichi Tanyama Naka, Kobe-shi, Hyogo 1-3 1-3 Higashikawasaki-cho, Oo-ku Kawasaki Heavy Industries, Ltd. Kobe Head Office

Claims (18)

[Claims] 1. A bottom partition wall is formed in the vicinity of the bottom of a cylindrical body to be buried in the ground, and a cylindrical hollow partition wall is erected in an opening provided at the center of the partition wall, A submersible caisson excavation method in which an excavator is installed near the bottom of a partition wall to excavate, and the earth and sand excavated in a load chamber that is a space formed by the bottom partition wall of the skeleton, the outer peripheral wall, and the hollow partition wall. Etc. Or, the water caisson excavation method is characterized by excavating by storing water and adjusting the sinking force of the skeleton. 2. The stability of the face and the sinking force of the skeleton by adjusting the water level in the face composed of the space below the bottom partition of the skeleton and the inside of the hollow partition to a pressure that opposes the earth pressure or water pressure during excavation. The submersible caisson excavation method according to claim 1, wherein the excavation is performed so as to adjust. 3. When the water level in the face composed of the space below the bottom partition wall of the skeleton and the inside of the hollow partition wall is set to a pressure that opposes the sinking force of the skeleton when the skeleton force of the skeleton is large, The underwater caisson excavation method according to claim 1, wherein the caisson excavation method is performed by generating buoyancy against the face and adjusting the stability of the face and the sinking force of the skeleton. 4. The body is suspended by a plurality of jacks provided on a support frame fixed to the ground, and the load applied to the jack is measured by a load measuring device attached to the jack. Excavation is performed by adjusting the water level in the load chamber and / or the face so that the load applied to the jack becomes a predetermined value set in advance by a pump device attached to the face. The underwater caisson excavation method according to any one of claims 1 to 3. 5. When adjusting the load applied to the jack, the water level in the load chamber is mainly adjusted, and the water pressure in the face is excavated so that the pressure is slightly higher than the groundwater pressure. The underwater caisson excavation method according to claim 4, wherein. 6. When adjusting the load applied to the jack, even if the water level in the load chamber becomes zero, if the load of the jack exceeds the set range in the direction in which the jack extends, the pressure inside the face is increased. The water caisson excavation method according to any one of claims 4 to 5, wherein the water level of the face is adjusted so as to raise the buoyancy of the skeleton by raising the water level. 7. A bottom partition wall is formed in the vicinity of the bottom of a cylindrical body to be buried in the ground, and a cylindrical hollow partition wall is erected at an opening provided at the center of the partition wall, An excavator is arranged in the vicinity of the bottom of the partition wall, and the bottom partition wall of the skeleton, a load chamber, which is a space formed by the outer peripheral wall and the hollow partition wall, stores excavated earth and sand or water and sinks the skeleton. An underwater caisson excavating device used in an underwater caisson excavating method for excavating so as to adjust the force, wherein an engaging device is provided on the outer periphery of the excavator, and the hollow partition wall is cylindrical, and the vicinity of the lower end thereof is provided. The inner wall is provided with a fitting protrusion at a position corresponding to the engaging device, and by engaging the engaging device of the excavator and the fitting protrusion of the hollow partition, the position and orientation of the excavator with respect to the body Is characterized in that it can be controlled accurately. That underwater caisson drilling equipment. 8. The hollow partition inner wall is provided with a longitudinal guide member so that the posture of the excavator can be controlled when the excavator moves up and down in the hollow partition. The underwater caisson rig described in. 9. The engagement device of the excavator comprises an upper engagement contact piece provided above the outer periphery of the excavator and a lower engagement contact piece provided below, and the hollow partition wall is fitted with the engagement device. The engaging projection comprises an upper fitting projection that engages an upper engaging contact piece of the excavator and a lower fitting projection that engages a lower engaging contact piece of the excavator. The underwater caisson excavating device according to any one of 7 to 8. 10. The underwater caisson excavating device according to claim 9, wherein the positions of the upper fitting protrusion and the lower fitting protrusion of the hollow partition are displaced in the circumferential direction. 11. The underwater caisson excavator according to claim 9, wherein the upper fitting protrusion and the lower fitting protrusion of the hollow partition wall are protrusions having a gradient in a direction opposite to each other. apparatus. 12. The excavator lower engaging contact piece according to claim 9, wherein the lower engaging contact piece has a reverse slope to that of the lower fitting protrusion of the hollow partition wall to be engaged. The underwater caisson rig described. 13. The underwater caisson excavating device according to claim 9, wherein the upper engaging contact piece of the excavator is a movable contact piece configured to be capable of projecting movement. 14. The upper engagement contact piece of the excavator is configured to automatically be disengaged from the upper fitting protrusion of the hollow partition in an emergency such as a failure of a control device or the like. The underwater caisson excavating device according to claim 13, wherein 15. The excavator comprises a shell, a rotating device rotatably supported in the shell, a swing arm connected to the rotating device, and an excavator attached to the swing arm. 10. The method according to claim 9, wherein
13. The underwater caisson excavator according to any one of 1 to 12. 16. A revolving drive device is provided on the revolving arm, and the revolving drive device is configured to automatically return the revolving arm to the center position of the skeleton in case of an emergency such as a failure of a control device or the like. The underwater caisson excavating device according to claim 15, wherein: 17. An arm drive jack of the revolving arm is provided with an angle detection device, and a rotation device is provided with a rotation angle detection device, so that the excavation range can be controlled based on the detection values of these detection devices. The underwater caisson excavating device according to any one of claims 15 to 16, which is configured. 18. An outer pipe, an inner pipe slidably inserted therein, and a flexible pipe connected to the inner pipe, one end of which is near a rear surface of a cutter head of an excavator of the excavator. The underwater caisson excavating device according to any one of claims 7 to 17, further comprising a sludge discharge pipe that is open and has the other end communicating with the outside of the body.