A new sistem for harbour restoring: The Under Water Anchoring tecnology.
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1 A new sistem for harbour restoring: The Under Water Anchoring tecnology.
2 FOREWORD The worldwide increases in utilization of large ships for transportation has created an urgent need of deepening the seabed within port areas and consequently the rehabilitation of its wharfs. To date, traditional techniques to excavate near and reinforce seawalls have resulted in numerous and, at times, unsolved problems. The U.W.A. Under Water Anchoring System was created to solve some of the above mentioned problems. The simple part was to come out with the idea of installing sub-horizontal anchors below sea level with the utilization of the minijet technique. Subhorizontal anchor installation is the most efficient way to support wall loads and minijet is the fastest and simplest way to install anchors in difficult conditions. The complicated part was to design and produce a drill rig capable of installing the anchors from the top of the wharf.
3 Introduction to minijet technique The typical construction procedure for installing jet-grouted columns involves the following main operations: - Drilling a 75/100mm hole with jetting drill string to the designed depth; - Injection of a water/cement mixture at high pressure (400/500 Bars) through nozzles located on a monitor directly above the drill bit; - Timed incremental lifting and simultaneous rotation of the drill string during pressure injection to the designed level. Where the jet-grouted column requires steel reinforcing, the common process is to re-drill in of the centre of the column, insert the reinforce and grout. All of these operations are time consuming, significantly reduce production, and don t guarantee the centralization of the reinforcing and the integrity of the soilcrete column. The minijet technique overcomes all these problems and substantially increases production. High strength hollow threaded rebar, bit/monitor and couplers with specialized internal seals designed for high pressure injection (Up to 400 Bar) are used as sacrificial drilling/injecting rods and left in place after the jetting operations. With this technique it s possible the realization of soilcrete columns with diameters between 300 mm and 900 mm in function of the design needs and following the geological/geotechnical context where they are executed. minijet Drill string (Scheme)
4 Typical U.W.A. work application / Design
5 Typical UWA work application
6 UNDER WATER ANCHOR REMOTE CONTROLLED DRILLING UNIT
7 Under Water Anchor drilling system Hydraulic Crawler Drilling Unit Steel Frame Mast As shown above, the U.W.A. drilling system consists of three main parts: 1) Hydraulic Crawler 2) Steel Frame Mast 3) Drilling Unit
8 60 Ton Hydraulic Crawler Excavator supports the mast/drilling unit and moves the drill rig along the wharf and provides hydraulic power to all drilling operations. The drill rig has a total of 2 control cabins: A) from the left side cabin, the operator moves and sets up the hydraulic crawler (fig. 2) over the drilling point. B) from the right side cabin, the operator manages (fig: 3a, 3b, 3c) the final positioning and the drilling operations. This control cabin is equipped with several advanced, computerized drilling instrumentation: I. Two monitors show the images from the 4 (four) cameras installed at strategic points of the Drilling Unit to visually verify the operations of drilling and rod loading. II. The control panel and one 15 TOUCH SCREEN displays all operations that the machine is performing in real time.
9 FIG. 2 Left Side Cabin FIG. 3a Drilling Unit Control Cabin FIG. 3b Control Room and 15 touch screen monitor FIG. 3c
10 Thanks to a dedicated software the main computer of the U.W.A. is preset to record all the main parameters related to anchor installation and obtain a specific report for each anchor executed (Fig. 4). FIG. 4 Anchor report
11 Vertical movement of the internal Mast and of the attached Drilling Unit is accomplished with a 3 phase electric telescopic hydraulic piston (Fig. 5). Within the Steel Frame Mast, 8 (eight) angular blocks are installed which function to stiff the entire structure and to enable locking of the internal Mast / Drilling Unit at the pre-set depth. A safety winch holds the internal Mast in the event of failure of the hydraulic piston. Safety winch Telescopic piston Fig. 5 Telescopic piston and safety winch
12 On the hydraulic crawler main arm is mounted the Mast Steel Frame, which can advance the internal movable Mast and the Drilling Unit to the required depth. At the lower end of the internal Mast is mounted a two axis sliding system (Fig. 6), for the final positioning of the Drilling Unit onto the chosen drilling point. Fig. 6 Positioning System of the Drilling Unit
13 DRILLING UNIT MOVEMENTS Drilling Unit rotation on the horizontal plane (perpendicular to the main Mast ): Drilling Unit translation along the (x) axis (perpendicular to the drilling mast): 500 mm Drilling Unit translation along the (y) axis (parallel to the drilling mast): mm Pitch movement of the Drilling Unit on the (x) axis: +5 / -5
14 The internal sliding Mast system allows set-up of the Drilling Unit at various levels below working level. The maximum drilling depth can vary up to 13,10 m (Fig. 7). Fig. 7 Maximum drilling depth
15 8 7 9 The Drilling Unit Fig. 8 Drilling Unit Details 1. Drilling mast 6. minijet rebar loading system 2. Rotary head 7. Video cameras and lighting system 3. Carousel for minijet rebars 8. Box housing hydraulic valves and logic 4. Centering device-clamps-breaker (Fig. 9a) 9. Hydraulic hoses holder 5. DTH/Core-barrel loading system (Fig. 9b)
16 Centering device, clamps, rod breaker and approach sensors (FIG. 9a/b/c): 1) Centering device 4) DTH/Core-barrel loading system 2) Clamps 5) Approach sensors 3) Rod Breaker Fig. 9a - Centering device, clamps, breaker Fig. 9c Approach sensors Fig. 9b - DTH/Core-barrel loading system
17 minijet U.W.A. Installation Main Equipment List: - U.W.A. Drilling Unit - High Pressure Pump - Automatic Mixing Unit - Cement Silo
18 Phase 1. Loading of the MINIJET rebars on the carousel loader Maximum capacity of the carousel loader (Fig. I): n. 10 minijet rebars 3.0 m Carousel loader minijet rebars loading system Fig. I - Carousel loader
19 Phase 2. Lowering of the internal Mast and Drilling Unit The operator, after moving the UWA Drilling Unit to the horizontal design anchor location, lowers the excavator arm and slides the internal Mast and Drilling Unit to the design drilling depth. Phase 3. Final Positioning The operator, from the control cabin, provides input to the electronic management system to complete the final approach of the machine to the wharf wall. This operation is automatically performed and checked by mean of four proximity sensors (Fig. II) located on the front side of the Drilling Unit steel frame. Sensors Fig. II - Wall proximity sensors
20 Phase 4. Coring/Drilling through the concrete/steel sheet wharf wall An approximately 100 mm diameter drill hole through the concrete/steel sheeting is required to allow the installation of the minjet anchors. This drilling operation can be performed using a diamond core bit or DTH water hammer. The loading/unloading operation of the DTH/Core-barrel is performed automatically with a hydraulic arm located on the left side of the centralizer/clamps of the drilling mast. Phase 5. Installation of a minijet underwater anchor The minijet anchor has the following main components: - Drill bit with 2 high pressure grout injection nozzles threaded on the 1st minijet rebar. - Threaded rebar/rebar couplers with high pressure sealing system at the ends of each minijet rebar. - minijet hollow rebars.
21 U.W.A. anchor installation steps a. The initial minijet rebar is automatically unloaded from the carousel and positioned at the drilling axis of the rotary head (Fig. V) and clamps (Fig. IV) by a hydraulically operated loading system (Fig.III) b. Simultaneously with the drilling operation, a cement grout mixture is injected at high pressure (30-40 MPa) with the Jetting-in method c. After the drilling/injection of the initial minijet rebar, the rotary head is retracted back to the starting position and the steps a. and b. are repeated until the designed depth is reached.
22 Breaker Clamps Centralizer Fig. III - minijet rebar loading system Fig. IV - Centralizer, clamps, breaker Fig. V - Rotary head
23 Under Water Anchor case history
24 DATE: CONTRACTOR: JOB-SITE LOCATION: TYPE OF WORK: March in progress P.A.C. S.p.a. Ravenna (Italy) Under water anchors TECHNICAL REPORT For the work of deepening of the Ravenna harbour the Port Autority in preference to reconstruction of the wharves with longer and heavier sheet piling or other equal system, they identified the structural reinforcement of the existing wharves by means of deep underwater horizontal anchors as a new technical solution with important economical savings. The whole project of anchoring has been divided in two lots of about m/each; the first lot (890 anchors) has been completed at the end of 2011 and now is started the first part of the second lot. Each designed anchor has a length of 18,0 m and is installed at a depth of 8,0 m from the medium sea level. The underground soils are mainly constituted of marine sand with silty/clayely layers (See below stratigraphy).
25 REPRESENTATIVE JOB-SITE STRATIGRAPHY
26 The news of the job-site is represented by the fact that to realize the above mentioned anchors has been employed an innovative drilling system named U.W.A. (Under Water Anchors) for the automatic installation of horizontal anchors following the minijet technique. The minijet anchor consist of a minijet column, with nominal diameter of about 400 mm, endowed of a steel reinforcement consisting of: galvanized selfdrilling hollow bar type R51, galvanized high pressure couplers and sacrificial drill bit with nozzle for the high pressure injection. They were subjected to various tests to ascertain the real interaction between the steel reinforcement and the minijet soilcrete and also between the minijet soilcrete and the surrounding natural soil; all of this to ensure compatibility of the adopted technique with future working loads applied on the anchors in question. TESTING ANCHOR: 5,00 M DEEP (Length: 18,00) TESTING ANCHOR: 8,00 M DEEP (Length: 18,00)
27 After the Under Water Anchors installation, the design foresees to complete the anchors with n. 1 steel plate for a better distribution of the applied loads, n. 1 nut and a plastic protection cap. The mentioned horizontal anchors will be all pre-tensioned at a load of 100 kn. Schematic presentation of the tensioning device minijet underwater anchors installed N Average minijet anchor unit length Type of soil treated with the minijet technique Water level minijet column minimum diameter minijet injection pressure Material used on the minijet job-site Pre-tensioning load applied on each minijet anchor 18,00 m Marine sands with silty/clayly layers Sea lavel 400 mm 400 Bars Self-drilling rods type R51 (Ultimate load: 800 kn; yeld load: 630 kn; max.); 100 kn
28
29
30 SAPIR Engineering S.r.l. Socio Unico Ravenna Via G. Antonio Zani, 1 Tel Fax segreteria@sapireng.it - Internet:
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