WO2019125095A1

WO2019125095A1 - Metal intake tower

Info

Publication number: WO2019125095A1
Application number: PCT/MA2018/000022
Authority: WO
Inventors: Hamid ALAOUCH; Arnaud KWAYEP; Mehdi LAHLOU; Souhail ZRAOURA; Peter BECAR
Original assignee: Aic Metallurgie S.A
Priority date: 2017-12-21
Filing date: 2018-12-18
Publication date: 2019-06-27
Also published as: MA41713A1; MA41713B1

Abstract

A vertical cylindrical metal tower with a diameter of 3.5 m and a height of approximately 35 m. The cylinder made from S355JO steel is provided with three tappings for the water intakes. The tower is provided with a set of ladders, walkways and platforms allowing access to the different levels of the intakes for visits and maintenance. The metal tower is self-resisting to external and internal pressures and is sized for the maximum water level. On the three tappings, fixed wheel guard gates and debris-retaining gratings are used to control the flow rate upstream from the dam. A cofferdam is installed for all maintenance operations. The tower constitutes an adductor system for enhancing the drinking water supply.

Description

METALLIC TOWER OF WATER SUPPLY

The present invention relates to a vertical tower of drinking water intakes immersed in water, provided with a lower chamber for the recovery of the valves and valves of a superior operating chamber equipped with control devices of said valves. This tower is used as part of the integration of a new drinking water intake on an existing dam.

The tower is linked to the buttress of the dam via a rigid metal lattice structure transferring all the loads to civil engineering.

This tower will replace the basic solution commonly used, that of the metal pipe with 3 levels of separate outlets.

Field of the invention

The present invention is in the field of hydromechanical equipment hydraulic dams.

State of the prior art:

A metal structure with three sockets, each socket is equipped with a removable grid can be replaced by a baffle element and a guard valve and the two sliding paths in grooves parallel to the upstream face of the dam.

Each water intake has its own pipe and fixed parts elements guiding the valves, separately from the other outlets, from the level of the intake in the reservoir to the control chamber located at the same level of the crest of the dam.

A valve chamber is located on the metal structure that is accessible from the ridge, which necessitates adaptation of the upstream parapet accordingly.

Difficulties presented by the prior art:

The difficulties presented by the previous solution, that of the metal pipe with 3 levels of separate taps, are as follows:

• Consumption of a large quantity of steel as part of the resistance of the solution adopted to the forces induced by its immersion in the water of the dam namely the hydrostatic pressure and the buoyancy of Archimedes - Non-optimized solution

• Difficult assembly during the installation of the structure on the buttress of the dam • Difficulty of connection to the body of the dam in the sense that the forces transmitted to the concrete are substantial and lead to the manufacture of very delicate assemblies

• Long realization time; namely for supply, manufacture and assembly as quoted above

• Difficulty of maintenance related to the inclined arrangement of the proposed structure which leads to valves operating on an inclined plane

PROPOSED SOLUTION :

• The proposed solution consists of a single metal tower uniting the three outlets in a single tap with smaller and smaller recesses on the upstream face of the dam. The structure also has the advantage of being vertical designed to overcome the disadvantages of the structure proposed by the customer and offer it an optimized structure in terms of operation, manufacture, maintenance and assembly and costs.

CONSTITUTION OF THE PROPOSED SOLUTION:

The device according to the invention consists of the following elements: ifigl. Plate 1/3)

1-Round Vertical Cylinder Jacks, 2-Chamber Lower, 3-Chamber Superior, 4-Structure Metal Carrier, 5-Access Gateway to Upper Room, 6-Guard Car Van, 7-Removable Grate, 8-Coffer , 9-Wave joint.

Vertical cylindrical tower of the plugs (fig.l):

A vertical cylindrical metal tower with a diameter of 3.5m and a height of approximately 35m. The steel cylinder S355J0 is equipped with three connections for water intakes.

At each stitching, a groove is provided on the outer portion of the tower for guiding the gate or cofferdam. This groove extends to the floor of the lower chamber. The approach section of the grid is 1.20m x 2.40m, which guarantees an approach speed of less than 2m / s for a flow rate of 5m3 / s.

At each stitching, a groove is provided on the inner part of the tower for guiding the guard rail valve. This groove extends to the lower chamber where the valve and the rods are taken over by the system of brimps. The control section of the guard rail valve is 1.20m x 2.0m.

At mid-height of the tower, a triangulated metal structure makes it possible to take up the transverse forces.

On the lower part of the tower, a DN1200 stitching made of S355J0 steel.

This stitching is connected to the sealed pipe in the buttress via a DN 1200 PN 10 wave joint.

The base of the tower is equipped with a full sized bottom to withstand the full load of the dam. The tower is equipped with a set of ladders, walkways and platforms to access the different levels of the outlets for the visit and maintenance.

The metal tower is self-resisting to exterior and interior pressures and is sized for the PHE (Higher Waters) Coast.

Lower chamber (fig.2):

The upper part of the tower is connected via a rigid metal flange to the lower chamber. A2-70 stainless steel bolts provide the connection.

The lower chamber is 11.6m x 8.5m in size and is made of standard hot rolled steel sections. It allows the recovery and storage of rodents. It is accessible from the floor of the upper room via a ladder.

A rotating jib equipped with a manual chain hoist with a capacity of 1 Ton, for taking back and storing the rods of the catch guard wagon valves is installed on the ceiling of the lower chamber.

At the level of the floor of the chamber, is installed a set of chocks and devices for storing rods. The recovery of brimbales is made with the rotating stem installed in this room.

Crutches are installed in the room for putting the aprons of the guard rail valves in the visiting position.

The floor of the lower chamber is movable and a reservation allows to reach the ladder access to the tower.

Superior room (2):

The upper chamber is 11.6m x 8.5m in size and is made of standard hot rolled steel sections.

In this room will be installed the maneuvering equipment, handling and ancillary equipment of the water intake. It is accessible from the crest of the dam via an access bridge above the supporting structure of the tower.

Supporting metallic structure (fig.l):

A bearing metal structure sized to take all the forces to which the catch is subjected (own weight, operating load of the valves, operating load of the traveling crane, Archimedes thrust, wind, etc.) makes it possible to link the taken to the civil engineering of the buttress.

The efforts are transmitted to civil engineering at the level of the supports by means of anchor rods sealed deep on the buttress of the buttress.

The metal structure is made of standard hot rolled steel sections.

The metal bearing structure is inclined relative to the horizontal so that the forces are transmitted to a large part of the concrete body of the buttress. Gateway to the upper room (fig.ll:

An access bridge fixed horizontally on the supporting structure ensures access to the upper chamber.

Vignole-type rails make it possible to transfer equipment from the ridge to the chamber on a trolley provided for this purpose.

The gangway is equipped with guardrails for safety.

The access gateway to the upper chamber is made of standard hot rolled steel sections.

Gate wagon valve (fig.3):

Each jack level is equipped with a guard rail valve closing a 1.2m x 2.0m control section.

The deck made of steel S355 JR is of the wagon type, with downstream sealing and upstream plating sheet. It is composed of a plating sheet reinforced by horizontal and vertical beams. The threshold knife is sufficiently reinforced.

The seal is achieved by means of synthetic rubber profiles, fixed by stainless steel bolts not passing through the plating sheet.

The rollers are mounted with self-lubricating bearings, on stainless steel shafts.

The attachment system of the valve to the brackets is composed of the clevis of the valve, the lower bridge and a linkage of stainless steel heat treated.

Removable grid (fig.4):

Each jack level is equipped with a gate closing a 1.2m x control section

2.4m.

The grid made of steel S355 JR is formed by a panel in the form of bar wire mesh S355JR, section 1.2 m x 2.4 m. The grid is removable and replaceable by the cofferdam.

The grid is calculated to withstand the full load of the dam (PHE - Plus Hautes Eaux) and in case of complete clogging. The grids of the different sockets are identical and interchangeable.

The grille is equipped with a lifter with a system of attachment and automatic stall.

The handling of the grid will be done by means of the traveling crane located in the upper chamber.

Cofferdam (fig.3):

A cofferdam is planned for the three levels of catch, it closes a section of control of 1.2m x 2.4m.

The deck made of steel S355 JR is of the type of plating upstream and downstream sealing. It is equipped with balancing bypass.

The seal is ensured by means of synthetic rubber profiles, fixed by stainless bolts.

The deck is dimensioned for the lowest grip and the highest waters of the dam.

Wave joint (fig.5):

The wave joint makes it possible to compensate for the variations of the position of the tower relative to the changes of the coast of the dam. The wave joint is sized to take a 150mm variation in all three directions. PRINCIPLE PE OPERATION AND REALIZATION: (gall plank 1/3)

The "Immersed Well" type upstream outlet structure is weldable S355JR steel, the upstream intake structure will be manufactured in elements assembled by flanges and reinforced by welding.

The water intakes will be integrated into the structure by upstream heads. The two upper rooms will be installed on the well and hooked by elements anchored on the upstream face of the dam. A footbridge will link the rooms to the ridge.

The tower (Well immersed) allows the control of water upstream of the dam on 3 levels of intake and is then an adductor system for strengthening the drinking water supply.

Each outlet is equipped with a debris retaining grid set up using a spreader.

The opening / closing of each socket is performed by adjusting wagon valves operated by cylinders from the control chamber.

A cofferdam is stored at the level of the upper chamber and serves to close the outlets for any maintenance operation.

ADVANTAGES OF THE PROPOSED SOLUTION:

• The proposed variant has the following advantages over the basic solution:

• Controlling the consistency of the work makes it possible to respect the time allowed for all the works.

• The proposed variant can be realized at a relatively lower cost for the client.

• The DN 1200 PN 10 wave joint installed downstream of the gate valve compensates for the relative displacement of the buttress and the downstream pipe.

• A rigid metal structure allows to resume the efforts due to the operation of the downstream pipe.

• The joints will be above the surface of the water by welding which will ensure all necessary controls.

• Cockpit wagon valves operate on a vertical plane which improves reliability, reduces maintenance operations and facilitates operation.

• The gates and cofferdams are manoeuvrable by the overhead crane of the upper chamber via an automatic hook and hold lifter which facilitates operation and maintenance.

• The forces are transmitted from the upstream cylindrical tower to the civil engineering of the structure in a controlled manner by a visible visible bearing structure which can be provided with a device for checking displacements.

• The vertical cylindrical tower is accessible for inspection and inspection by the operator after the closure of the three guard rail gates or the closure of two guard valves and a cofferdam.

• The wave joint located at the base of the cylindrical tower makes it possible to avoid transferring significant efforts to the civil engineering of the structure in an inaccessible zone and whose deformations can not be controlled.

Claims

1. Structure Metallic tower of water intakes on hydraulic dam equipped with:

• Lower chamber (2) for maintenance of valves (6) and cofferdams (8)

• Upper chamber (3) for controlling valves (6) and cofferdams (8)

• Supporting metallic structure (4) allowing the transfer of forces on the hydraulic dam

• Access gangway (5) allowing access to rooms (2; 3)

• Guard rail valves (6) allowing the selection of the water intake according to the water level of the dam reservoir

• Removable grilles (7) allowing coarse filtration of water

• Cofferdam (8) for the maintenance of valves (6) and other equipment downstream

• Wave joint (9) allowing a compensation of the movements of the catch according to the level of water of the reservoir of the hydraulic dam

It allows to pass a flow of raw water in a gravitational way on three levels of catch, not requiring any continuous external energy to repress the water.

2. Metal tower structure water intake hydraulic dam according to claim 1, provided with a steel structure, allowing ease of implementation and thus a time gain during installation.

3. Metallic tower structure hydropower water intake according to claims 1 and 2, provided with a bolted structure, allowing economy of realization and laying following the standardization of the parts to be manufactured and the nesting when of the pose.

4. Structure Metal tower water intake hydraulic dam according to claims 1 to 3, provided with stiffeners designed on the body of the structure, to withstand external and internal pressures during all periods of the year, restraint minimum and maximum, without changing or adapting to the structure and without the use of external energy.

5. Structure Metallic tower hydraulic water intake according to claims 1 to 4, provided with a light structure, to be placed in a submerged environment, without the need to empty the water reservoir of the reservoir dam hydraulic.

6. Structure Metallic tower hydraulic water intake according to claims 1 to 5, provided with a transportable structure, to ensure all the controls necessary for the good behavior of the structure because the assemblies will be done at above the water surface.

7. Structure Metallic tower hydraulic water intake according to claims 1 to 6, provided with wagon van gates operating on a vertical plane to improve their reliability, reduce the maintenance operation and facilitate their operation.

8. Structure Metallic tower hydraulic water intake according to claims 1 to 7, provided with grids and cofferdams operable by an overhead crane from the upper chamber by means of a lifting beam and automatic unhooking allowing the operation and maintenance of equipment.

9. Structure Metallic tower water intake hydraulic dam according to claims 1 to 8, provided with emerging metal bearing structure, allowing a transmission of the forces of the upstream cylindrical tower to the civil engineering of the work in a controlled manner.

10. Structure Metal tower water intake hydraulic dam according to claims 1 to 9, provided with inspection chambers, allowing access for inspection and inspection by the operator after the closure of the three wagon gates. guard or closure of two guard valves and a cofferdam.

11. Structure Metal tower hydraulic water intake according to claims 1 to 10, provided with a wave joint located at the base of a cylindrical tower to avoid transferring significant efforts to the civil engineering of the structure in an inaccessible area.

12. Structure Metallic tower hydraulic water intake according to claim 11, provided with a wave joint to compensate for changes in the position of the tower relative to the changes of the dam coast.