02630_en.doc

SECTION 02630

STORM DRAINAGE

PART 1 - GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ITALIAN NATIONAL INSTITUTE FOR UNIFICATION OF STANDARDS (UNI) PUBLICATIONS

UNI EN 1563

(2004) Founding – Spheroidal graphite cast irons.

UNI EN ISO 1872-1

(2002)Plastics - Polyethylene (PE) moulding and extrusion materials - Designation system and basis for specifications.

UNI EN ISO 1872-2

(2002)Plastics - Polyethylene (PE) moulding and extrusion materials - Preparation of test specimens and determination of properties - Amendment 1.

UNI EN 10240

(1999)Internal and/or external protective coatings for steel tubes - Specification for hot dip galvanized coatings applied in automatic plants.

UNI EN 1401-1

(1998)Plastics piping systems for non-pressure underground drainage and sewerage - Unplasticized poly(vinyl chloride)(PVC-U) - Specifications for pipes, fittings and the system.

UNI 7448

(1975) Rigid (unplasticized) PVC pipes. Test methods.

UNI 7449

(1975) Rigid (unplasticized) PVC fittings and flanges. Test methods.

UNI 7613

(1976) High Density Polyethylene pipes for buried sewer drain. Types, dimensions, and requirements.

UNI EN 124

(1995) Gully Tops and Manhole Tops for Vehicular and Pedestrian Areas - Design Requirements, Type Testing, Marking, Quality Control.

1.2 DESCRIPTION OF WORK

The work includes all storm drainage systems 1.5 meters outside the building.

1.3 SUBMITTALS

1.3.1 Product Data

a. Pipe, joints and fittings

b. Frames, gratings and covers

c. Precast structures

1.3.2 Certificates

a. Pipe, joints and fittings Manufacturer's certificates of conformance or compliance shall be furnished for all pipe and pipe joint materials. These certificates shall include proof that the product has successfully passed all tests set forth in the referenced publications, whether these tests are specified to be mandatory or otherwise. For tests which are not specified to be performed at definite intervals during manufacture, the tests shall have been performed within three years of the date of submittal of certificates on the same type, class, grade, and size of pipe joint material as is being provided for the project.

1.4 DELIVERY, STORAGE, AND HANDLING OF MATERIALS

1.4.1 Delivery and Storage

Materials delivered to site shall be inspected for damage, unloaded, and stored with the minimum of handling. Store materials on site in enclosures or under protective coverings. Do not store materials directly on the ground. Inside of pipes and fittings shall be kept free of dirt and debris.

1.4.2 Handling

Pipe, fittings, and other accessories shall be handled in such manner as to ensure delivery to the trench in sound, undamaged condition.

PART 2 - PRODUCTS

2.1 PIPE, JOINTS AND FITTINGS

2.1.1 Polyethylene Pipe

Polyethylene pipe shall conform to all specifications of the Unification Norms and UNI EN ISO 1872-1 and UNI 7613, thermoplastic materials in polyethylene, system of classification and methods of testing.

a.

These norms concern the circular cross-section pipes, manufactured with high density polyethylene (HDPE), suitably stabilized to resist ageing.

b. The pipes shall be of the type for liquids under pressure. They shall be produced according to the UNI Norms, including UNI EN ISO 1872-2. Pipe shall have a green stripe indicating that the pipe is for sewer systems only. This mark has to be provided by the manufacturer at time of pipe production.

Acceptable Manufacturers

The following manufacturers generally meet the provisions of these specifications for HDPE plastic piping and fittings:

a. FITT S.P.A.

Via Astico 40

36030 Fara Vicentino (VI)

Tel. 0445/399111

Fax 0445/897593

b. SOCIETA' DEL GRES

ING. SALA S.P.A.

Via Marconi, 1

24010 Petrosino (BG)

Tel. 035/579111

Fax 035/579342

c. ROMANA EDILIT PRIMA S.R.L.

Via Pier Vittorio Aldini, 41

00178 - Roma

Tel. 06/7267.0492/3

d. SIREA

Via Corriera 25

48010 - Ravenna

Tel. 0545/78008

Fax 0545/78790

e. SAMI PLASTIC S.P.A.

Loc. Piego, Fraz. Monterone

52038 Sestino (AR)

Tel. 0575/71711

Fax 0575/772369

2.1.1.1 Pipe Characteristics

The pipes in H.D.P.E. shall be supplied with smooth ends:

a. In rolls for classes PN6-PN10-PN16 up to the internal diameter of 110 mm;

b. In bars of a commercial length of 6 m to 12 m for classes PN 2,5 - PN 3,2 - PN4 for internal diameters of 110-1000 mm and for classes PN6 - PN10 of internal diameters 125-630 mm.

2.1.1.2 Material Characteristics

The material used to manufacture the pipes shall comply with the following characteristics:

a.

specific gravity 0.945 to 0.965 b.

thermal conductivity 0.47 kcal/m.hr. deg. C c.

elasticity moduli 9000 kg/cm d.

electric resistivity 1015 OHMS e.

yielding 240 kg/cm2 f.

elongation on yielding <20% g.

elongation at breaking point >500%

2.1.1.3 Black Smoke

The black smoke normally used as an additive in the quantity of not less than 2 percent in weight, shall have the following general characteristics:

a.

Mass by volume 1.5-2 gr/cm3 b.

Average measurement of the particles 0.010-0.025 microns.

2.1.1.4 Internal and External Surfaces

The internal and external surface shall be smooth and uniform; free of irregularities and defects and the section compact and free of cavities and bubbles.

2.1.1.5 Special Pieces

The special pieces for the pipes in H.D.P.E. which may be used are the following:

a.

Sleeve b.

Reduction sleeve c.

Male union d.

Female union e.

Flanged union f.

90 degree bend g.

45 degree elbow h.

90 degree elbow i.

90 degree elbow with female threaded union j.

90 degree tee k.

90 degree tee with varied reductions l.

90 degree tee with female threaded off-take m.

90 degree tee with male threaded off-take n.

Stirrup intake with 4 bolts o.

Stirrup intake with 2 bolts

All the special pieces shall be suitable for PN16 and the special pieces may be furnished both in metal and in resin material. For the latter, the unions shall be of the compression type. The compression unions shall normally be furnished by the manufacturer with the various pieces formed from the following materials:

a. The body in black polypropylene

b. The ferrules in gray polypropylene

c. The clamping rings in white polyacetate

d. The O'-ring in nitrile rubber

2.1.1.6 Joints

Joints in small diameter pipe shall be butt welded by heat fusion in accordance with the pipe and fitting manufacturer's recommendations. The joint shall be regular in appearance and have physical strength not less than the pipe being joined. Ends to be joined must be square. The joint fusion equipment must be designed specifically for the joint being made and be in good working order. Do not apply stress to the joint until it is cool to the touch.

Joints in large diameter pipe may be rubber basket, bell and spigot joints as manufactured integrally with the pipe. Joints shall be assembled as recommended by the manufacturer.

2.1.2 PVC Pipe

PVC pipe shall conform to the applicable UNI Standards. PVC pipes shall be solid wall and shall conform to UNI EN 1401 and UNI 7448. Fittings and flanges shall conform to UNI 7449. The joints shall be of the bell and spigot type with elastomeric seal.

2.1.2.1 Joints

Joints shall be in accordance with UNI 7449.

2.2 CONCRETE

Unless otherwise specified, concrete shall conform to the requirements for Class Rck 250 concrete under Section 03300, "Cast-In-Place Concrete". Reinforcement shall be deformed bars type FeB44k.

2.3 FORMS

Forms shall be of wood, steel or other suitable material.

2.4 FRAMES, GRATINGS AND COVERS

Frames, gratings and covers for manholes and pits shall be made of cast iron rated for truck traffic in compliance with UNI EN 124, and UNI EN 1563 norms, and shall be of the dimensions indicated on the drawings. Workmanship and finish shall be equal to the best practice in modern structural shops and foundries. Frames, gratings, and covers shall be formed to shape and size with sharp lines and angles. Shearing and punching shall produce clean, true lines and surfaces. Castings shall be sound and free from warp, cold shuts, and blot holes that may impair their strength or appearance. Exposed surfaces shall have smooth finishes and sharp, well defined lines and arises. The necessary rabbets, lugs, and brackets shall be provided.

2.5 MORTAR

Mortar for setting castings and connections to drainage structures shall be composed of one part by volume of Portland cement and two parts of sand. The quantity of water in the mixture shall be sufficient to produce a stiff workable mortar. Water shall be clean and free of harmful acids, alkalies, and organic impurities. The mortar shall be used within 30 minutes from the time the ingredients are mixed with water. The inside of the joint shall be wiped clean and finished smooth.

2.6 WARNING TAPE AND BARE COPPER TRACER WIRE

As specified in Section 02315, "Excavation and Fill".

2.7 DRAINAGE STRUCTURES

Construct of clay brick, solid concrete masonry units or concrete. Precast structures may be provided in lieu of cast-in-place concrete. Pipe-to-wall connections shall be mortared to produce smooth transitions and watertight joints. Bases shall have smooth inverts accurately shaped to a semicircular bottom conforming to the inside contour of the adjacent sewer sections. Changes in direction of the sewer and entering branches into the manhole shall have a circular curve in the manhole invert of as large a radius as the size of the manhole will permit.

2.8 MANHOLE STEPS

Manhole steps shall be made of galvanized steel bars in accordance with UNI EN 10240 and as indicated on the drawings.

PART 3 - EXECUTION

3.1 INSTALLATION OF PIPE

Pipes shall be placed at the depth and gradients indicated on the design drawings and approved by the Contracting Officer’s Technical Representative, following verification of the perfect condition of the pipes and the related joints. No gradient and reverse gradients less than the design ones shall be allowed: should such gradients be found, the Contractor shall remove and reconstruct the work at his own expense.

3.1.1 Excavation

Excavation shall be in accordance with Section 02315, "Excavation and Fill".

The Contractor shall remove and replace at his own expense, all pieces which are defective, damaged or in any case do not guarantee the perfect outcome of the work. All pipes placed in transitable or parking areas or in areas otherwise subject to vehicle traffic, in the Contracting Officer’s Technical Representative’s opinion, and placed at a depth of less than 60 cm (measured from the finished surface to the upper surface of the pipe) shall be buried in and protected by a layer of concrete of suitable thickness. The connection to manholes and other appurtenances shall be carried out in workmanlike fashion, paying attention to the position and the perfect sealing.

3.1.2 Warning Tape and Bare Copper Tracer Wire

As specified in Section 02315, "Excavation and Fill".

3.2 CONNECTIONS TO EXISTING LINES

Connections to existing lines shall be made in a manner approved by the Contracting Officer.

3.2.1 Storm Drain System

Connections to the existing storm drain system: The Contractor shall furnish all material and labor required to make connections into the storm drain system in the streets, and shall perform all necessary excavating, backfilling, and other labor as required. The pipe shall be cut or broken neatly so that the pipe ends will be approximately flush with the interior face of structure walls, but not protruding beyond such face into the structure. The pipe to wall connection shall be mortared smoothly to produce smooth transitions and watertight connections. The Contracting Officer shall be notified in writing at least ten days prior to the date the connection is made.

3.3 MANHOLE, AND CATCH BASIN CONSTRUCTION

Construct base slab of cast-in-place concrete or precast concrete base sections. Make inverts in bases with a smooth surfaced semi-circular bottom conforming to the inside contour of the adjacent sewer sections. For changes in direction of the sewer and entering branches into the manhole, make a circular curve in the manhole invert of as large a radius as manhole size will permit. For cast-in-place concrete construction, either pour bottom slabs and walls integrally or key and bond walls to bottom slab. For precast concrete construction, make joints between manhole sections with the gaskets specified for this purpose. Cast-in-place concrete work shall be in accordance with the requirements specified under paragraph entitled "Concrete" of this section.

3.4 FIELD INSPECTIONS AND TESTS

3.4.1 General

Perform field tests and provide labor, equipment, and incidental required for testing.

3.4.2 Pipeline Testing

Each straight run of pipeline shall be checked for gross deficiencies by holding a light in a manhole; it shall show a practically full circle of light through the pipeline when viewed from the adjoining end of the line.

-- End of Section –-

Section 02630

Section 02630