SECTION 33 05 16.13

haltingnosyΠολεοδομικά Έργα

29 Νοε 2013 (πριν από 3 χρόνια και 7 μήνες)

75 εμφανίσεις

Master Specification

December 01, 2010

33 05 16.13
-
1

Precast Concrete Utility Structures


SECTION
33 05 16.13

PRECAST
CONCRETE UTILITY STRUCTURES

PART 1 GENERAL


1.01

SECTION INCLUDES

A.

This item shall consist of the construction of both sanitary and
storm
sewer precast concrete manholes in accordance with these
specifications,
at the specified location and conforming t
o the
lines, grades, and
dimensions shown on the plans or required by
the Construction Manager.

B.

Appurtenances


1.02

RELATED SECTIONS

A.

Section
01
35 23.13

-

Project Safety Requirements


B.

Section 01

33 01



Submittals

C.

Section 01

45
16



Field
Quality Control

Procedures

D.

Section
31 23
16



Excavation

E.

Section
31 23 33



Trenching

and Backfilling

F.

Section
32 11
23



Aggregate Base Course
s

G.

Section
31 23 19



Dewatering


1.03

REFERENCES

A.

ASTM A185
-

Steel Welded Wire Fabric for Concrete
Reinforcement

B.

ASTM C33
-

Concrete Aggregates

B. ASTM C39


Compressive Strength Cylinder Specimens

D.

ASTM C478


Precast Reinforced Concrete Manhole Sections

E.

ASTM C497


Testing of Manhole Section
s

Master Specification


December 01, 2010

33 05 16.13
-
2

Precast Concrete Utility Structures


F.

ASTM C990


Joints for Concrete Pipe, Manholes, and
Precast Box
Sections Using Preformed Flexible Joint Sealants

G.

ASTM C 1244


Standard Test Method for Concrete Sewer
Manholes
by the Negative Air Pressure (Vacuum) Test

H.

AASHTO
M55
-

Steel Welded Wire Fabric for Concrete
Reinforcement

I.

AASHTO M199


Precast Reinforced Concrete Manhole
Sections

J.

AASHTO M198


Joints for Concrete Pipe, Manholes and
Precast Box
Sections Using Preformed Flexible Joint Sealants

K.

Standard Constructi
on Specification for Sewers and Drainage
Facilities
2000 by the Metropolitan St. Louis Sewer District

1.04

SUBMITTALS

A.

Refer to Section 01

33 01

-

Submittals.

B.

Quality Control Submittals: Submit manufacturers
certification indicating compliance with specified
performance and design requirements.

1.05

SUBMITTALS FOR CONTRACT CLOSEOUT

A.

In accordance with Section
01 77 19

-

Contract Closeout and
Section
01 78 01

-

Warranties and Bonds, Procedures for
submittals.

B.

Manufacturer's Certificate: Certify that products meet or
exceed specified requirements.

C.

Record actual locations of the manhole and the invert elevations.

D.

Identify and describe unexpected varia
tions to subsoil
conditions or
discovery of uncharted utilities.

1.06

QUALITY ASSURANCE

A.

Perform all work in accordance with referenced standards,
Section

01

45
16



Quality Control

1.07

DELIVERY, STORAGE, AND HANDLING

A.

Deliver, store, protect and handle products to site under
provisions of
Section
01
35 02

-

Material and Equipment.

B.

Store units in an upright position.

Master Specification


December 01, 2010

33 05 16.13
-
3

Precast Concrete Utility Structures

PART 2
-

PRODUCTS


2.01

MANUFACTURERS

A.

Precast Manholes: Klueter Brothers, Edwardsville, IL (618)
656


2581
or approved equivalent.

B.

Manholes Frames and Covers: Neenah Foundry or approved



equivalent.


2.02

MATERIALS

A.

Manhole Bases: Bases shall have a monolithic base slab with
riser barrel
conforming to ASTM C478, AASHTO M199, and
designed for

AASHTO HS
-
20 loading.

B.

Manhole Risers: Riser sections shall have a minimum 4.5" wall
for 42" diameter and conform to ASTM C478 and AASHTO
M199.

C.

Manhole Top Slabs: Top Slabs (if required) shall have a
minimum
thickness of 8" and conform to ASTM C478 and
designed for AASHTO
HS
-
20 loading.

D.

Manhole Steps: Manhole steps shall be
1
/2" diameter steel
reinforced copolymer polypropylene conforming to ASTM C478,
AASHTO M
-
199
and OSHA 29 CFR 1910.27. Steps shall be
p
laced in vertical alignment
in preformed holes
as
per step
manufactures instructions. The steps shall
resist a pullout force of
over 1500 lbs. Eng lugs shall have a reflecting
material insert. The
steps shall not exceed spacing greater than 16" on center.

E.

Concrete: Concrete shall be air entrained in accordance with
IDOT
specifications and have a minimum concrete compressive
strength of 4,000 PSI at 28 days. Concrete shall be placed in
forms and vibrated in
such a manner to make a dense uniform
product.

F.

Coating: Exterior surfaces of manholes shall have two coats of
an
approved asphalt coating applied according to manufactures
recommendations. An alternate to the exterior coating shall be a
concrete
admixture that is applied to the concrete with batchi
ng
and demonstrates a reduction in water absorption below five
percent.

G.

Pipe Connections: Pipes shall be connected to the manhole
walls using
an approved flexible sleeve. Approved connections
shall be A
-
Lok or Z
Lok by A
-
Lok Products, or approved equal

conforming to ASTM C990.


H
.

Joint Sealant: Joint sealant shall be an approved butyl rubber


conforming

to ASTM C478 and ASTM C990.

Master Specification


December 01, 2010

33 05 16.13
-
4

Precast Concrete Utility Structures


PART 3


EXECUTION


3.01

REJECTION

A. Precast units shall be subject to rejection for failure to conform to
any of
the specified requirements. In addition, individual
sections may be
rejected because of any of the following:

1.

Fractures or cracks passing through the wall, except for a
single end
crack that does not exceed the depth of the joint.

2.

Defects that indicate imperfect proportioning, mixing, and
molding.

3.

Surface defects indicating honeycombed or open texture.

4.

Damaged or cracked ends where such damage would
prevent making a satisfactory joint.

5.

Any continuous crack having a surfac
e width of 0.01 inch
(0.3 mm)

or more and extending a length of 12 inches (300
mm) or more,
regardless of position in the section wall.


3.01

INSTALLATION

A.

Place the Precast base units on an aggregate base course
with a
minimum thickness of eight inches after compaction. The
granular sub
base shall be checked for level prior to setting.

B.

After setting of precast base section, the joint shall be clean free
of dirt
or other unsuitable materials. A butyl joint sealant
con
forming to ASTM C990 shall be applied to the joint area and
then the next precast section installed. Set all sections in plum.
When setting sections ensure that the manhole steps are set in
vertical alignment. After two sections are joined
together. The
in
terior and exterior of the joints shall be grouted.

D.

Joining Pipe to Manholes: If manhole base sections are equipped
with
flexible sleeves, slide pipe through sleeve until the end of
the pipe is
flush with the inside wall of manhole. Install and
secure
sleeve to pipe
with stainless steel clamp is required. If
flexible sleeve is a compression
type, such as A
-
Lok type, no
external stainless steel clamp is required.

E.

Plug holes, in the concrete sections made for handling with a non
-
shrink
grout and/or th
e rubber plugs.

Master Specification


December 01, 2010

33 05 16.13
-
5

Precast Concrete Utility Structures

3.03

FIELD TESTING

A.

Refer to the Standard Construction Specification for Sewers and
Drainage
Facilities, 2000, by the Metropolitan St. Louis Sewer
District and the
following specifications, whichever gives the
greatest effect.

B.

Inspection: All units shall be inspected to be sound. There shall
be no
visible leakage through the walls or pipe connections.

C.

Testing: Testing on Sanitary Precast Concrete Manholes
shall be by
Vacuum Testing in accordance with ASTM C 1244.
All vacuum
testing
shall be preformed prior to backfilling of
manhole. The test procedure shall be as follows:

1.

Plug, seal, and brace all pipes entering the manhole to
prevent them from dislodging during the test. Pipe plugs shall
be installed beyond
boot seals.

2.

Firmly secure vacuum testing equipment to manhole
as per
recommendations.

3.

Start vacuum and seal and necessary leaks around
the testing equipment bladder.

4.

Attain a vacuum of 10" Hg.

5.

Time pressure drop to 9" Hg. Record time. If time to drop 1"

Hg is
less than 1 minute, manhole shall be passed. If
manhole does not
pass, the Contractor shall locate leak(s)
and repair and retest until satisfactory.

6.

Release Vacuum and backfill manhole in
accordance with specifications herein.

D.

Repair: Any defect found shall be repaired as approved by the
Construction Manager. The repair method shall be of sound
principle to
ensure compliance with this specification.

END OF SECTION 33 05 16.13