JPH0489925A - Depositing construction method for underground structure - Google Patents

Abstract

PURPOSE:To suppress the construction costs by exhausting turbid water simultaneously with supplying of clear water to an excavation room of an underground structure, excavating the bottom ground by an underwater automatic excavator while the inside of the excavation room is monitored by a monitor camera, and sinking the structure little by little for installation. CONSTITUTION:The ground under the excavation room 1d of an underground structure 1 is excavated by an automatic underwater excavator 8, and clear water is supplied to this excavation room 1d from a clear water supply pipe 3 while turbid water is exhausted from a turbid water exhaust pipe 2. Soil and sand from excavation is turned into muddy water and exhausted to outside via an exhaust pipe 14 while clear water is spouted from a water delivery pipe 16. The excavation room 1d is illuminated by an illumination device 12 along with photographing by a monitor camera 10 and displaying on a TV screen 19, and excavation is performed while the inside of the excavation room 1d is monitored. The structure 1 is sunk little by little for installation while its own weight is balanced with the internal pressure of the excavation room 1d.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention is a construction method for constructing an underground structure or a structure having a series of above-ground buildings thereon, in which underwater excavation is performed below the underground structure. In particular, it relates to the construction method for submerging the structure.

``Prior art and problems to be solved by the invention'' Conventionally, as methods for constructing structures underground, there have been generally known methods such as the cut-and-cover construction method using mountain retaining supports, and the construction method using pneumatic caisson or open caisson. ing.

However, in the cut-and-cover method using mountain retaining shoring,
Because loads are applied to the mountain retaining wall by groundwater pressure outside the mountain retaining wall and earthen walls, the mountain retaining wall must be made strong, which poses a problem in that the construction costs associated with the mountain retaining wall increase.

In addition, in the construction method using double-mnematic caissons, there are safety issues for workers due to pressurized air work, construction instability due to uneven loads acting on the structure as it is sunk, impossibility of sinking due to surrounding friction, and advanced excavation. precision requirements,
Furthermore, there were various problems when constructing underground structures, such as over-designing of the sub-slab as the work room slab, which was determined by the conditions at the time of construction.

Furthermore, the open caisson construction method has problems such as difficulty in controlling the posture*g and position during excavation, and deep excavation cannot be expected due to problems such as underground water pressure and earth pressure.

Therefore, as an underground structure submersion construction method, the applicants constructed an underground structure in advance on the ground, with an excavation chamber open at the bottom and a communication opening in the floor above the excavation chamber. While excavating the ground below the bottom, it is sunk into the designated position.
An underwater automatic excavator is installed in the excavation chamber, and water is filled into the excavation chamber from a cylindrical body that is connected to the communication opening and raised upward, and then the ground below the chamber is excavated underwater with the underwater automatic excavator. We proposed a construction method that balances the weight of underground structures with the pressure of water in the excavation room.

However, in the above construction method, underwater excavation of the bottom ground is carried out in murky water while groping, so if an abnormality occurs in the excavation part, such as when there is an obstruction on the cutting edge of the underground structure loader, the underwater excavation The husband (a diving specialist) has to investigate the murky water by hand, which makes it difficult to grasp the actual situation.In addition, since the construction engineer cannot directly investigate and confirm the situation, it becomes difficult to take appropriate measures. there were.

"Means for Solving Problems" This invention is the same as the above-mentioned conventional! In order to solve problem III, an excavation chamber was created at the bottom that was separated from the upper space by a floor slab and was open at the bottom, and a clear water supply pipe and a turbid water intake pipe were installed inside the excavation chamber, and at the required locations. A well-shaped underground structure with lighting equipment and a monitor camera installed above ground is constructed in advance, and transparent water is supplied into the excavation chamber from the transparent water supply pipe, while turbid water is discharged from the turbid water discharge pipe, and the inside of the excavation chamber is monitored using the monitor camera. A method for submerging underground structures in which the bottom ground is excavated underwater using an automatic underwater excavator placed inside the excavator while being monitored, and the underground structures are sunk one after another while balancing their weight with the pressure of water in the excavation chamber. 6 "Function" By using the outer wall of the structure to be constructed as a retaining wall, the construction of a retaining wall can be omitted, and the #! Water is injected into the space surrounded by 1g Al, and underwater excavation is carried out using an automatic underwater excavator, so excavation can be carried out safely and easily without pressure work, and,
By balancing the weight of this structure or the pressure of water filled in the upper cavity, as well as the frictional force acting between this structure and the ground, the structure can be continuously and reliably excavated simultaneously. It becomes possible to sink it into a predetermined position.

In addition, in order to simultaneously supply clear water into the excavation chamber and drain turbid water, the interior is made transparent and illuminated with a lighting system, allowing external engineers to easily see the excavation area and its excavation status directly using a monitor camera. This makes it possible to take appropriate and prompt countermeasures in the event of an abnormality.

"Embodiments" Below, embodiments of the present invention shown in the drawings will be described.
A well-shaped underground structure 1 to be constructed is constructed on the construction planned ground.

This underground structure 1 is a cylindrical structure with an outer wall 1a around its periphery having a sharp edge at the lower end, and an excavation chamber 1d which is open at the bottom and partitioned into an upper cavity 1c by a floor slab 1b at the bottom. It is constructed as a concrete structure.

Inside the excavation room ld, a turbid water discharge pipe 2 and a transparent water supply pipe 3 are piped in series from above ground through the floor slab 1b, and are connected to a turbid water permeation plant 6 via a water supply pump 4 and a drainage pump 5, respectively. has been done.

The turbid water discharge pipe 2 is piped from the bottom of the floor slab 1b to the cutting edge of the outer wall 1a in the excavation chamber ld, and is preferably provided with a water intake port 2' in a portion corresponding to the lower part of the excavation chamber 1d.

The transparent water supply pipe 3 is piped in the excavation chamber ld from the bottom of the floor slab 1b to the outer wall 1a, and desirably has a water fountain 3' provided in a portion corresponding to the upper part of the excavation chamber 1d.

On the floor slab 1b, a required number of work equipment mounting bases 7a, 7b, and 7c whose bottoms are exposed inside the excavation chamber 1d are installed at required positions, and a telescopic boom type cutter is attached to the bottom of the work equipment mounting base 7a. An automatic underwater excavator 8 such as an unmanned sand pump excavator and a wave exploration transmitter 9 are installed at the bottom of the work equipment mounting base 7b, and a TV monitor camera 10 and a wave exploration receiver 11 are installed at the bottom of the work equipment mounting base 7c (also installed at the bottom of the work equipment mounting base 7c). A lighting fixture 12 and a wave exploration receiver 11 are respectively attached.

The underwater automatic excavator 8 has a muddy water inlet 13 at the tip of its excavation part.
The excavated soil is discharged as muddy water to the outside by a mud pump 15 via a mud drainage pipe 14, and a water supply pipe 16 branching from the transparent water supply pipe 3 is attached to the area around the muddy water inlet 13. The structure is designed to spray clear water out of the excavation area and prevent the water around the excavation from becoming polluted as much as possible.

Note that the underwater excavator 8 may be of a crawler type that moves automatically under remote control control. .

The wave exploration transmitter 9 transmits a sound wave of a desired frequency based on the wave signal transmitted from the wave exploration device 17, receives the sound wave reflected back to the excavated ground with a receiver 11, and detects the phase difference between the transmitted wave and the received wave. Detects the excavation depth and displays the data on TV.
It is designed to be displayed sequentially on the screen 18.

The monitor camera 10 can be directed in its pointing direction by an external operation, and a captured image can be displayed on a TV screen 19.

Each of the above devices 8. 9. 10. 11. 12 operations・
The wiring cord for transmission, power transmission, etc. is a protection pipe 21a supported by a support frame 20 installed at the top of the underground structure 1.
, 2lb, and 21c.

When submerging the underground structure 1 configured as described above, first, the ground below it is excavated by hand or an excavator to the vicinity of the groundwater level, and the required amount is filled into the empty space lc under its own weight and above. It sinks due to the weight of the water.

Then, the automatic underwater excavator 8 is assembled in the excavation chamber ld of the underground structure 1, and then transparent fresh water is injected and filled into the excavation chamber 1d from the transparent water supply pipe 3 at a pressure slightly higher than the groundwater pressure to form the underground structure. A required head pressure is applied to the bottom of object 1.

In this state, the automatic underwater excavator 8 excavates the ground below the excavation chamber 1d underwater, and the weight of the underground structure 1 (including its own weight and the load added to it) and the water adjusted and filled in the upper cavity lc are The underground structure 1 is smoothly submerged while appropriately balancing the pressure and the frictional force acting between the underground structure 1 and the ground, and is successively constructed to a predetermined depth.

During the above-mentioned excavation, when transparent water is supplied into the excavation chamber ld from the transparent water supply pipe 3, the internal turbid water is discharged from the turbid water discharge pipe 2, and the earth and sand excavated by the underwater automatic excavator 8 is turned into muddy water and is drained from the sludge pipe. Transparent water is ejected from the water pipe 16 while being discharged to the outside via the water pipe 14 to prevent water from becoming contaminated around the excavation part.

As a result, the water in the excavation chamber ld remains transparent at all times, so the inside of the excavation chamber ld is illuminated by the lighting equipment 12 and photographed by the monitor camera 10, and the excavation situation inside is shown on the TV.
This is displayed on the screen 19, and the engineer excavates while constantly monitoring and grasping this.

On the other hand, in response to a signal from the wave exploration receiver 11, excavation depth data is continuously displayed on the TV screen 18, thereby monitoring and managing the excavation status and the subsidence status of the underground structure 1.

Thereafter, as necessary, the upper part of the structure is successively erected in parallel with the progress of excavation of underground structure 1, and the required underground structure is submerged by repeating excavation and subsidence in the same manner as above. Install.

After completing the sinking in this way, the water in the excavation room ld is drained and the automatic underwater excavator 8, monitor camera 10, lighting equipment 12, etc. are removed together with the work equipment mounting stands 7a, 7b, 7c, and the excavation room 1d is removed. After removing the work equipment mounting stands 7a, 7b, and 7c, ready-buried concrete is filled in the entrance, and if necessary, soil consolidation material is injected around the structure 1 to complete the construction.

It goes without saying that the structure 1 constructed according to the present invention can be a structure in which an above-ground building is built continuously from an underground part.

"Effects of the Invention" As described above, according to the present invention, the outer wall of the structure to be constructed can also be used as a retaining wall, and the structure can be sunk directly to the required position without excavation using retaining shoring. The overall construction cost can be significantly reduced by eliminating the need for mountain retaining construction costs.

In addition, since the excavation chamber at the bottom of the structure is filled with water and the ground below is excavated underwater using an automatic underwater excavator, the weight of the structure, the pressure of the water, and the abrasion that acts between the structure and the ground are reduced. The structure can be stably and safely deposited in a predetermined position while appropriately balancing the forces, and the upper part of the structure can be erected one after another on top of the underground structure as the excavation progresses. It is possible to shorten the construction period and reduce construction costs.

Furthermore, in order to supply clear water into the excavation chamber and drain turbid water at the same time, the interior is made transparent and illuminated with a lighting system, making it easy for external engineers to see the excavation area and its excavation status directly using a monitor camera. This makes it possible to take appropriate and prompt countermeasures in the event of an abnormality.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing the construction state of the present invention. 1..Underground structure, 1a..Outer wall, 1b..floor slab, 1c..upper space, 1d..excavation room, 2..turbid water discharge pipe. 2''...Water intake, 3...Transparent water supply pipe, 3'...Fountain, 4...Water pump, 5...Drainage pump, 6...Murky water transition plant, 7a, 7b, 7c...Work Equipment mounting stand. 8. Automatic underwater excavator, 9. Wave exploration transmitter, 10.
・Monitor camera, 11...Wave exploration receiving lighting equipment, 13
...Suction port, 15.. Sludge pump, 17.. Wave probe, 19.. TV screen, 12. Sludge drainage pipe, - Water pipe.・TV screen. - Support frame, 21b, 2 - Protection tube. Faith equipment. 4. ・ 16. 18. 20. 21a. Procedural amendment band March 22, 1991

Claims (1)

[Claims] (1) An excavation room with an upper space separated by a floor slab and an open bottom is provided at the bottom, a transparent water supply pipe and a turbid water discharge pipe are installed inside the excavation room, and lighting equipment and monitors are installed at the required locations. A well-shaped underground structure equipped with a camera is constructed above ground in advance, and transparent water is supplied into the excavation chamber from the transparent water supply pipe, and at the same time, turbid water is drained from the turbid water discharge pipe. An underground structure characterized in that the bottom ground is excavated underwater by an underwater automatic excavator placed inside the underground structure while monitoring the underground structure, and the underground structure is sequentially sunk while balancing its weight and the pressure of water in the excavation chamber. A construction method for depositing objects.