1. Transfer method for construction materials & all types of concrete with chute by using
Continuous-Cantilever Super-Structure (CCSS) as a supporter
Mehdi Afshar & Jyane Construction Co.
No.6, Peroshat St., End of Motahari Ave.,
Tehran, IRAN, Postal Code: 1567717693
Tel (Fax).: +982188417804, GSM: +989121725667
Thuraya: +8821650267850
E−mail: mafshar2@yahoo.com
No.2, 37th bilnd Alley, Africa Blvd., Africa Sq.,
Tehran, IRAN, Postal Code: 1516955811
Tel.: +98−2188794922, Fax: +98−2188796037
GSM: +98−9121185232
Email: JYANE_CONST@yahoo.com

2. Transfer method for construction materials & all types of concrete with chute by using
Continuous-Cantilever Super-Structure (CCSS) as a supporter
In the execution of huge civil projects (especially mass concrete & dam construction), conveying of concrete or
construction materials is performed by utilizing different types of: truck & machinery, crane & bucket, pump & under
pressure system, conveyor belt and etc. In cases, where the geometrical conditions of the route are appropriate, they can be
transferred by chute or pipe. Conveying concrete by chute (applicable in cofferdam & main dam body of Jahgin storage
dam), is one of the most economical and fastest methods throughout the world. The obvious point of this method in the
main dam body is the exclusive usage of Continuous-Cantilever Super-Structure as a supporter, which has a crucial
effect on the construction of the Jahgin dam without leaving any embedded part in the dam body. Coincidently, with raising
the dam body level, the super-structure, which has been built in modular segments, can be demounted quickly. The velocity
and capacity of transferring is considerable in this method. The transfer of roller compacted concrete (RCC) in a 90 m path
is performed in less than 12 sec, without enforcing any change or lowering the final quality of RCC. In the meantime,
considering the capability of the equipment of concrete production, it carries 1000 m3
of RCC to site per hour.
The rapidity and simplicity for the purpose of applying each type of correction, probable modifications or repair, not
needing any type of shoring & scaffolding (free height from ground isn't important), not creating any type of disturbance for
construction, less comparative cost in: erection-commissioning, service-maintenance & not needing expert personnel or
heavy equipments for utilizing of this method, are considered as other its benefits. This super-structure, with the slope of
45° & length of 90 m has been constructed in four spans of: 18, 18, 24 & 30 m. The lower 30 m span has been in the form
of cantilever from the beginning & at the same time the upper spans function in the form of continuous beam. With the
gradual shortening of chute, each one of following continuous spans will subsequently function in the form of cantilever.
Based on the relevant codes, loading of dead load, live load, wind load & dynamic load resulting from the RCC
movement were performed. Modelling, analysis & design were performed by utilizing the engineering software.
Considering the lower self weight & also less effective area against wind, type of member elements, space truss-frame was
selected, which of course box girder was specifically utilized in the beginning of the 2 longer spans, considering the
enlargement of the required section dimensions & connections heaviness. The members of ST37, bolts of A325 & A490
and pins of CK45 & ST52 were made in the specialized factory while performing different types of destructive & non-
destructive tests & materials analysis under accurate supervision. For controlling the fixed end moments (overturning), the
reinforced foundations of span’s columns have been tied & fastened to the rock surface by AIII rock bolts as required. After
civil operations and completion of super-structure erection, the chute section, which has been made by Hardox anti-abrasion
sheet, longitudinal guard rail, stairs & the surface membrane of the chute, were installed.
Due to the criticality of the project scheduling and its intensiveness, the total period of design, fabrication & installation
lasted for 4 months. At the time of installation and operation, the required post loading & preloading tests were performed.
The period of the resistance first mode is 0.41 sec according to the calculations, in which the neutral period was practically
estimated 0.476 sec; its damping ratio has been measured as equal: 0.022.
Composition of chute & conveyor belt (like the system used in the Jahgin main dam body) can be the best & the most
appropriate method of transferring & replacement. The designers of the said method believe that in case of necessity, longer
spans can be constructed in the form of cantilever by this method.
The super-structure segments can be used with a little change or modifications, in other similar projects.
This Invention has been registered jointly under the names of Mr. Mehdi Afshar & Jyane Construction Co., under
No. 30516, in the Iranian Department for Registration of Companies & Industrial Ownership on Oct. 23, 2004. This
Invention won the Gold medal with the felicitation of Jury in 33rd
International Exhibition of Inventions, New
Techniques and Products of Geneva on: 8th
April 2005, Switzerland.

3. Civil Works, Fabrication, Installation & Erection
1-Foundation Rock-Bolts 2-Foundation Reinforcement 3-Columns
4-Columns Fabrication 5-Space Truss-Frame Fabrication 6-Box Girder Fabrication
7-Erection of CCSS 8-Erection of CCSS 9-Erection of CCSS
10-Erection of CCSS 11-Erection of CCSS 12-Stairs, guardrail & Chute Erection
13-Cover (Membrane) Erection 14-High Capacity Connections 15-View of CCSS

4. Operation (Construction of JAHGIN storage dam) & Dismounting
16-CCSS Length: 90 m 17-CCSS Length: 88 m(cantilever span) 18-CCSS Length: 80 m
19-CCSS Length: 78 m 20-CCSS Length: 72 m 21-CCSS Length: 68 m
22-CCSS Length: 64 m 23-CCSS Length: 62 m 24-CCSS Length: 56 m
25-CCSS Length: 50 m 26-CCSS Length: 48 m 27-CCSS Length:46 m
28-CCSS Length: 42 m 29-CCSS Length: 34 m
30-Dismounting of: column, frame,
box girder & Hardox chute.