JPH0344822Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field A water seal chamber is provided at the bottom of a piping tunnel (service tunnel) formed in the upper part of an underground cavern, and a concrete paved floor is formed on top of the water seal chamber, thereby forming a piping tunnel and a water seal tunnel. This relates to a pipe tunnel in an underground cave that is made into the same tunnel to reduce construction costs.

Conventional technology In general, in a rock-based water seal tank (oil storage tank), when the natural groundwater level drops and the water seal function cannot be maintained, a water seal for underground water supply is installed separately from the piping tunnel connected to the water seal tank by a delivery shaft. It is common to install tunnels and water seal borings, but in this case, the cost of constructing water seal tunnels and water seal borings for water supply increases, resulting in higher overall costs. It is.

The technology improved in view of the above drawbacks was published in 1983-3155.
The technology is to lay gravel at the bottom of a pipe tunnel formed at the top of an underground cavern to form a permeable layer, form a concrete floor on top of the layer, and connect the concrete floor to the wall of the pipe tunnel. A water layer is formed along part or all of the periphery of the wall at the connecting part of the wall, but this makes it impossible to send pressurized water to the water-seal borehole and water-seal tunnel.

Problems that the invention aims to solve: Saving the cost of constructing water seal tunnels and water seal borings for water supply, and supplying water by reliably injecting water into the rock around underground caves through water seal boreholes. This is an attempt to solve the problem of maintaining the seal.

Measures to solve the problem At the bottom of the piping tunnel formed at the top of the underground cave, a reinforced concrete pavement floor is formed at a constant height from the bottom to form a water seal chamber, and the bottom and concrete pavement are A plurality of horizontal or diagonal water seal boreholes are provided in the wall between the floors, and a main pipe for supplying pressure water is installed along the entire length in the longitudinal direction in the center of the water seal room, and inside the water seal borehole. A branch pipe is installed, and the branch pipe is connected to the main pipe and opened to supply pressurized water to the main pipe of the water seal chamber formed by the bottom and concrete paved floor, and the branch pipe communicating with it supplies pressure to the water seal borehole. By pumping water and filling the water-seal borehole and water-seal chamber with pressurized water and supplying the water by pressurizing it into the rock surrounding the underground cave, water seals can be maintained, and when the natural groundwater level rises. All you have to do is pump the water between the bottom and the paved floor to the outside.

Example At the lower part of the piping tunnel 2 formed in the upper part of the underground cave 1, a constant height h is maintained from the bottom surface 3,
For example, a water seal chamber 7 is formed by forming a concrete paved floor 6 with reinforcing bars 5 at a height that allows the water seal borehole 4 to open sufficiently, and a wall 7' is formed between the bottom surface 3 and the concrete paved floor 6. A plurality of horizontal or diagonal water seal boreholes 4 are provided, and a main pipe 8 for supplying pressure water is provided in the center of the water seal chamber 7 over the entire length in the longitudinal direction, and a branch pipe is provided in the water seal borehole 4. 9
The branch pipe 9 is connected and opened to the main pipe 8. The main pipe 8 is connected to a pump (not shown) for feeding pressure water.

Function When the natural groundwater level drops and the water seal function around the underground cavern 1 cannot be maintained, pressure water is pumped to the main pipe 8 in the water seal chamber 7 using a pump (not shown) to seal the water seal in the borehole 4. By filling the water seal borehole 4 and the water seal chamber 7 with pressurized water from the inner branch pipe 9, water can be maintained by pressurizing and supplying water into the bedrock surrounding the underground cave 1. When the natural groundwater level rises, the water in the water seal chamber 7 can be pumped out to the outside.

Effects of the invention: A water seal borehole is formed that connects to the water seal chamber, and pressurized water can be sent directly into the water seal borehole from the main pipe through a branch pipe, ensuring that pressure water is delivered to the water seal borehole. Since the system starts filling the underground cave from the ground up and then fills the water seal chamber, it is possible to maintain the water seal by supplying water under pressure into the rock around the underground cave through the water seal borehole and the water seal chamber. be.

[Brief explanation of drawings]

1 and 2 are a longitudinal sectional view and a cross sectional view of the entire structure, and FIG. 3 is an enlarged sectional view of the piping tunnel.

Claims (1)

[Scope of utility model registration request] At the bottom of the piping tunnel formed in the upper part of the underground cave, a reinforced concrete paved floor is formed at a constant height from the bottom to form a water seal chamber, and between the bottom and the concrete paved floor, a horizontal or A plurality of diagonal water seal boreholes are provided, and a main pipe for supplying pressure water is provided in the center of the water seal chamber along the entire length in the longitudinal direction, and branch pipes are arranged in the water seal borehole, and A plumbing tunnel in an underground cavern consisting of openings connecting branch pipes to the main pipe.