9.Method Statement for Pipe Culvert Works

Four Laning of Hyderabad – Karimnagar – Ramagundam Road on SH-01 in the state of AP. Package - 01: Km.28+200 to Km.82+000 & Package - 03: Km.144+500 to 197+000 Client

: Andhra Pradesh Road Development Corporation

Independent Engineer

: Louis Berger Group Inc.

Concessionaire

: HKR Roadways Ltd.

EPC Contractor

: Megha Engineering & Infrastructures Ltd.

METHOD STATEMENT FOR CONSTRUCTION OF PIPE CULVERTS

Rev. : 0

W.e.f: 03-03-2011 Page 1 of 7

METHOD STATEMENT FOR CONSTRUCTION OF PIPE CULVERTS 1. GENERAL This item of work shall be dealt with construction of Pipe culverts in complete compliance to the technical specifications.

2. PROCEDURE The procedure for construction of Pipe culverts is elucidated as under:


DETAILED CONSTRUCTION DRAWING PREPARATION: Detailed working drawing will be prepared & submitted for approval for each and every Pipe Culvert.
SETTING OUT: After the site has been surveyed, the limits of excavation shall be set out to true lines, curves and slope as per the MORT&H Specifications.
DISMANTLING OF EXISTING STRUCTURE: In case of re-construction the existing structure will be dismantled after taking the joint measurement of existing structure up to NGL. In case of widening of pipe culvert only the head wall will be trimmed as shown in drawing.
EXCAVATION: The excavation for foundation bed for pipe culverts shall be done true to the lines and grades shown on the drawings or in accordance with the Cl. No. 2903 of MoRT&H. After completion of the PCC and head wall up to the bottom of the pipe level, the open trench will be cut in existing embankment up to the level shown in the drawings and as per MORT&H Cl. No. 2903 (Para 1). In case of high embankments where the height of fill is more than three times the external diameter of the pipe, the embankment shall first be built to an elevation above the top of the pipe equal to the external diameter of the pipe, and to width

Four Laning of Hyderabad – Karimnagar – Ramagundam Road on SH-01 in the state of AP. Package - 01: Km.28+200 to Km.82+000 & Package - 03: Km.144+500 to 197+000 Client

: Andhra Pradesh Road Development Corporation

Independent Engineer

: Louis Berger Group Inc.

Concessionaire

: HKR Roadways Ltd.

EPC Contractor

: Megha Engineering & Infrastructures Ltd.

METHOD STATEMENT FOR CONSTRUCTION OF PIPE CULVERTS

Rev. : 0

W.e.f: 03-03-2011 Page 2 of 7

on each side of the pipe of not less than five times the diameter of pipe, after which a trench shall be excavated and the pipe shall be laid. The pipe shall be placed where the ground for the foundation is reasonably firm. If the soil at the bed level of the pipe is soft, spongy or other unsuitable soil, it shall be removed to such depth, width and length as directed by the Engineer and the extra depth shall be backfilled with approved granular material and compacted up to specified level. If bed-rock or boulder strata are encountered, excavation shall be taken down to at least 200 mm below the bottom level of the pipe in accordance with the Para-4 of the Cl. No. 2904 of MORT&H. Excavation shall consist of the removal of the material for the construction of foundation for apron, head wall and other similar structures, in accordance with the requirement of MORT&H specifications and the lines and dimensions shown on the drawings or as indicated by the Engineer. The work shall include draining and pumping. The removal of all logs, stumps, grubs and other deleterious matter and obstructions, necessary for placing the foundations, trimming of excavations, backfilling and clearing up the site and disposal of all surplus material.
FORM WORK: Formwork of required length and size shall be provided for laying and placing of lean concrete layer. Side formwork shall be used for apron as well as the head wall concrete work. All materials for formwork will conform to IRC:87 Formwork shall be removed not earlier than 24 hours after placing of concrete. The design and erection of formwork shall be as per IRC-87 and conforming to Section1500 of the Technical Specifications (MORT&H).
LAYING OF LEVELLING COURSE / HEAD WALL: i. ii.

iii.

Approved Design mix concrete would be provided. Till commissioning of our batching plant, Concrete mixer of 10/7 capacity with matching number of weigh batches will be provided in adequate number for concrete production for use in box culverts. Utmost care will be taken to ensure the quality of the concrete. Adequate number of needle vibrator will be used for proper compaction of concrete.

Four Laning of Hyderabad – Karimnagar – Ramagundam Road on SH-01 in the state of AP. Package - 01: Km.28+200 to Km.82+000 & Package - 03: Km.144+500 to 197+000 Client

: Andhra Pradesh Road Development Corporation

Independent Engineer

: Louis Berger Group Inc.

Concessionaire

: HKR Roadways Ltd.

EPC Contractor

: Megha Engineering & Infrastructures Ltd.

METHOD STATEMENT FOR CONSTRUCTION OF PIPE CULVERTS

Rev. : 0

W.e.f: 03-03-2011 Page 3 of 7

iv. v.

Levelling course Concrete M15 shall be laid to the thickness of 150 mm to reach the required founding level. After completion of PCC, head wall below sill level (M15 concrete) is laid accordingly as stated above. And after bedding and laying of pipes, Head wall top lift (M15 Concrete) is laid accordingly.


BEDDING FOR PIPE: The bedding surface shall provide a firm foundation of uniform density through out the length of the culvert conforming to the specified levels and grade shown on the drawing and will be as per the following cases. Case – 1:- If the height of the fill of embankment above the top of the pipe is less than 4 m, the bedding will be prepared with granular material as per Cl. No. 2904(1) of MORT&H. Case – 2:- If the height of the fill of embankment above the top of the pipe will be more than 4 M, the bedding will be prepared with PCC as per Cl. No. 2904 (II) MORT&H.
PIPE LAYING: Pipes will be laid in true length and line as per working drawings at the approval of the foundation bed by Engineer. In case of double or multiple pipe culverts the row of pipes shall be separated by a distance equal to at least half the diameter of the pipe subject to a minimum of 450 mm or as per the site conditions. Pipe centres will be matched in case of widening. The lifting, loading and unloading of concrete pipes will be done by small cranes / JCB at the factory / yard in such a manner that the pipes do not suffer any undue structural strain or damage. The lowering of the pipe in the bed shall be done with small crane or tripod-pulley arrangement. If above two options are not feasible then the pipes will be laid in the bed manually. The pipe will be laid from PCL to both directions depending on the case. It will be kept in view that pipe edge towards PCL be at such place that both the ends will be matching to the outer face of the headwalls.

Four Laning of Hyderabad – Karimnagar – Ramagundam Road on SH-01 in the state of AP. Package - 01: Km.28+200 to Km.82+000 & Package - 03: Km.144+500 to 197+000 Client

: Andhra Pradesh Road Development Corporation

Independent Engineer

: Louis Berger Group Inc.

Concessionaire

: HKR Roadways Ltd.

EPC Contractor

: Megha Engineering & Infrastructures Ltd.

METHOD STATEMENT FOR CONSTRUCTION OF PIPE CULVERTS

Rev. : 0

W.e.f: 03-03-2011 Page 4 of 7

The entire operations will be in accordance with the Clause No. 2905 of the MORT&H.
PIPE JOINTING: The pipe shall be jointed by flush joint. Flush joint may be internal flush joint or external flush joint. In either case, the ends of the pipes shall be specially shaped to form a self centering joint with a jointing space 13 mm wide. The jointing space shall be filled with cement mortar, I cement to 2 sand, mixed sufficiently dry to remain in position when forced with a trowel or rammer. Care shall be taken to fill all voids and excess mortar shall be removed
BACK FILLING: Immediately after the pipes have been laid and the jointing material has hardened the trench will be backfilled. The backfilling will be done in accordance with Cl. No. 2907 of the MORT&H. Backfilling up to 300 mm above the top of the pipe shall be done carefully and the soil shall be thoroughly rammed, tamped or vibrated in layers not exceeding 200 mm. The gaps between two adjacent pipes shall also be filled in the same procedure as explained above. The entire operation will be in accordance with the Cl. No. 2907 of the MORT&H.
PROTECTION AND CURING: As per section 1713.1, exposed surface of concrete shall be kept continuously in a damp or wet condition by ponding or by covering with a layer of gunny bags or similar materials and shall be kept constantly wet for a period of not less than 14 days from the date of placing of concrete. 3. EQUIPMENT/MACHINERY: a. b. c. d. e.

Excavator / J.C.B. which ever is applicable Batching Plant of capacity 30 M3/ hr Mixer Machine of Capacity 10/7 Weigh Batches of Capacity 500 Kg. Petrol/Electrical Vibrator & 60mm Nozzle.

Four Laning of Hyderabad – Karimnagar – Ramagundam Road on SH-01 in the state of AP. Package - 01: Km.28+200 to Km.82+000 & Package - 03: Km.144+500 to 197+000 Client

: Andhra Pradesh Road Development Corporation

Independent Engineer

: Louis Berger Group Inc.

Concessionaire

: HKR Roadways Ltd.

EPC Contractor

: Megha Engineering & Infrastructures Ltd.

METHOD STATEMENT FOR CONSTRUCTION OF PIPE CULVERTS

Rev. : 0

W.e.f: 03-03-2011 Page 5 of 7

f. De-Watering Pump g. Transit Mixer of Capacity 4 M3 h. Other relevant tools 4. RECORDS AND DOCUMENTS MAINTAINED: i. RFIs ii. Level control sheets (if reqd.) iii. Concrete Pour card / Concrete cube results 5. QUALITY CONTROL PROCEDURES: To ensure the suitability of materials / concrete, tests would be conducted at field/laboratory as per Cl.1000 & Cl.1700 of MoRT&H. And the same is detailed in Inspection test plan. 6. SAFETY MANAGEMENT ACTION PLAN In order to minimize the occurrence of site accident, the provision of a safe working environment for workers to work is essential. Our company endeavors to make a zero accident record in each site. In addition to the above, the following safety precautions must also be implemented in achieving the minimization of site accidents. SAFETY MEASURES: a) Provisions for workmen: i. It is required that all persons working at the site shall be provided with the safety equipments, protection means such as safety jackets, hand gloves, safety helmets and other necessary kinds. ii. All persons working on the site shall be trained by conducting the training course for safety to ensure that they are fully aware of the contents. b) Provisions for Equipment, Machine: a. All equipment will be ensured to operate safely, maintained and repaired periodically. b. All power equipment should be insulated and covered to all exposed live parts.

Four Laning of Hyderabad – Karimnagar – Ramagundam Road on SH-01 in the state of AP. Package - 01: Km.28+200 to Km.82+000 & Package - 03: Km.144+500 to 197+000 Client

: Andhra Pradesh Road Development Corporation

Independent Engineer

: Louis Berger Group Inc.

Concessionaire

: HKR Roadways Ltd.

EPC Contractor

: Megha Engineering & Infrastructures Ltd.

METHOD STATEMENT FOR CONSTRUCTION OF PIPE CULVERTS

Rev. : 0

W.e.f: 03-03-2011 Page 6 of 7

c. A competent person shall inspect equipment during shift duty. c) Provisions for Job Site: i.

ii. iii. iv.

v. vi. vii.

viii. ix. x. xi.

Relevant Caution boards and sufficient lighting system shall be installed at the working area to ensure safety for construction activities at night time. The working area shall be free from hazards before starting the work. Unnecessary materials such as empty bags and rubbish shall be removed periodically. Proper safety measures like barricading, guard poles painted with florescent in alternate bands, flags etc. will be provided prior to the commencement of excavation operations. Signal man will be placed at heavy traffic locations at the time of Execution. Reflective sign boards will be placed during night near risky locations. All workers shall be educated in the use of excavators, bulldozers, backhoes, graders and rollers such as the excavator arm & bucket distance and buffer zone in order to prevent from injuries. Operators would be thoroughly instructed to prevent pushing soil loads into the main road area if any. Photographs would be taken to disseminate and maintain traffic safety records Working area will be cordon with traffic cones to identify survey setting out to oncoming traffic on both sides. During excavation of foundations, if any hard rock is encountered special care shall be taken while blasting.

7. ENVIRONMENT CONTROL i.

All necessary measures shall be taken to maintain all plants and silencing equipments in good conditions so as to maintain air and noise emission during the operation.

ii.

All necessary measures shall be taken to control the disposal of all forms of waste generated by the construction operations and in all associated activities.

Four Laning of Hyderabad – Karimnagar – Ramagundam Road on SH-01 in the state of AP. Package - 01: Km.28+200 to Km.82+000 & Package - 03: Km.144+500 to 197+000 Client

: Andhra Pradesh Road Development Corporation

Independent Engineer

: Louis Berger Group Inc.

Concessionaire

: HKR Roadways Ltd.

EPC Contractor

: Megha Engineering & Infrastructures Ltd.

METHOD STATEMENT FOR CONSTRUCTION OF PIPE CULVERTS

Rev. : 0

W.e.f: 03-03-2011 Page 7 of 7

iii.

Disposable materials would not be dumped into streams or unauthorized areas. Every effort would be made not to disturb prevailing surface water runoff.

iv.

All necessary measures and precautions shall be taken to avoid any nuisance or disturbance arising from the execution of the work.