2023年6月26日发(作者：)

Matters needing attention

A, before rinsing to rinse solution, advance notice about the main water user.

B, before rinsing check rinse water will affect the safety of the Yangtze river ships, assign

personnel to safety monitoring in the process of washing.

8.3.1.10 pipeline anticorrosion

Pipe production is completed on the internal and external anti-corrosion, set aside 100 mm

so that the welding pipe jacking pipe end each joint well before after welding pipe jacking,

after the interface corrosion in pipe jacking. Pipeline corrosion protection work in strict

accordance with the construction requirements and design drawing standards. And

approved by the owner, supervision, the local quality inspection departments qualified.

8.3.2 pile foundation construction

Lower water head by six spacing for 5 m steel tube hole perfusion column, steel pipe for Φ

600 * 12 * 27419 mm, a total of 6, set the upper Φ 12 x 600 x 600 mm (adjustment) of

steel pipe pile, steel pipe pile location after watering C25 concrete in steel pipe, steel pipe

pile and steel pipe into the hole perfusion with flange connection between column.

Underwater laying part there are 5 sets of (every 2 a) Φ 12 x 600 x 600 mm steel pipe

piles, each steel pipe pile is composed of two D600 x 12 steel pipe pile, at 6.1 m set fittings

between the two pipe pile. Upper pipe pile setting adjustment section, section and pile

flange connection. Adjust the upper section set I40 beams, header, end plate and pipe

groove, pipe falls within the tube slot, and pipe clamp fixed beams. Steel pipe pile location

after watering C20 concrete in steel pipe.

Steel pipe before pile driving after cleaning brush chlorosulfonated polyethylene, primer,

intermediate paint, paint all along. Immediately after the pile foundation engineering of a

construction project organization construction, because it is the key to restrict water head

installed. Set a pile driving operation team. Before the construction need to quote the

detailed construction plan submitted to the owner, supervision, waterways, and all related

to channel management department for examination and approval.

Ask for their approval to organization construction.

Take use of pontoon water piling. Steel pipe pile and tolerance

The serial number tolerance of the project

1 pile end diameter or sectional dimensions plus or minus 0.5% diameter or length

pile

2 length > 0

3 high pile length 1% or less

4 the end flatness 2 or less

5 the end plane and pile body tilt of the center line of 2 or less

Steel pipe pile transportation USES the platform trailer, lifting more binding, transport and

handling proper protection measures, the ends of the pile in the process of steel pipe pile

group. When handling to prevent the impact caused by the pile tip, pile body damage or

bending. Yard smooth, firm, smooth drainage. Steel pipe pile can be placed four layers.

Protection Settings should be reasonable, on both sides of steel pipe piles with wedge plug,

to prevent rolling.

Should be piling into while welding extension. Steel pipe pile the YM - 505 n type semi-automatic gas shielded welding welding. Before welding, the end of the floating rust, oil,

etc. To remove the section pile end after hammering the deformation of the part should be

cut out. Upper and lower section pile welding should be corrected verticality, 2-3 mm

clearance of counterpart. Electrode should be dry. Welding should be symmetrical.

Welding using multi-layer welding, steel pipe pile the layers of weld joint should be

staggered, welding slag should be cleared. Pile extension of welding quality should comply

with the "steel structure construction and acceptance standard" and "regulations of

construction steel structure welding" regulation, as stipulated in the table below for each

joint appearance inspection, should also shall do the ultrasound, 5% of the joint points in

the same engineering inspection inspection shall not be less than three joints.

Pile extension weld appearance of allowable deviation

The serial number projects allow deviation

1 hi-lo 2 section pile up and down

2 bit depth (weld) 0.5 3 strengthening layer height (weld) 0 ~ + 2

4 strengthening layer width (weld) 0 ~ + 3

Pile driving test before each pile location line, began after pile driving to review and

correct. Due to the pile foundation construction quantities is not too big to take lighter

jacket erect pile hammer pile method.

Piling process are completed, please related department to check the retest, and then using

the method of the catheter to them concreting, according to the design drawings and

construction specifications requirements to fill the stone thrown around pile and stone

ridge build by laying bricks or stones, and according to the connection between the two

pipe pile.

Pipe pile upper section adjustment and I40 beams, header, end plate and tube slot on shore

good welding and anticorrosion, put all the pipe pile axis and elevation survey accuracy,

determine the final review the centerline and elevation of pile foundation specification,

consults the erect pipeline has assembled a good supports (upper pipe pile adjustment,

beams, header, end plate, tube slot).

Construction of 8.3.3 are included for water head

Water head construction into pile foundation construction, box water head assembly, water

head box and float, water head box in place.

First arrangement of pile foundation construction, pile foundation construction has been

completed, check the pile structure size, and then according to the design drawings of the

various components of water head the blanking, assembling, anti-corrosion.

Water head box on shore production assembly, materials for Q235 and A3 steel, after

completion of assembly to review and correct, for all steel components after cleaning brush

chlorosulfonated polyethylene, primer, is a paint, paint all along.

Water head on shore assembled well and after review and correct lifting barge to the shore,

a ship floating crane, the water head to transport to the upstream water head pile

foundation and pile foundation, the floating crane to lift water head box, slowly sinks down

into the pipe pile and water head installation location, divers in the water line review for water head enclosure, the pile foundation to adjust the end flange eye alignment of the pile

top flange of the eye, symmetry, in bolt, check water line of position of the head again,

after, fastening flange bolts, and correction of each detail fittings for water head bolt. The

installation of the box body take full distance meter monitoring.

8.3.4 immersed tube construction

8.3.4.1 construction plan

The engineering construction of immersed tube includes water head to bend to

consideration to 1 m, each section length is 110.5 m, there are two root.

Immersed tube part falls directly on the steel tube into the hole filling pile, only the

riverbanks of groove excavation. This part of the groove to disc dredger excavation,

excavation of earthwork using barges away. Underwater trench excavation mainly refers to

the gravity pipe pile frame and excessive part buried pipe joint groove excavation, pipe

jacking artesian pipe groove width 7.80 m, 0.10 m deep, slope ratio 1:1. 25. Underwater

trench should also be considered the security and stability of slope, so as not to impact

earth cave and diving personnel's personal safety. Dredger along the pipe groove by the

water began to dig, to the shore and soil on the shore, groove on both sides of the pipe

trench excavation length in place, started the Cheng Qingpo to dig out and up to standard.

Dig to a length, the divers for underwater inspection, make the groove comply with the

design requirements. Construction of the ship docked, anchoring, assignments and pipeline

floating, sink, etc., must be in conformity with the relevant provisions of the shipping

administration, waterway and other departments.

Suitable place assembled pipe sinking pipe in the upstream shore, intake and riverbanks

elbow assemble as a whole, according to my unit underwater pipeline construction

experience, in the elbow part 15 ° Angle welding ribbed plate reinforcement, ribbed plate

size is 150 * 80 * 20 mm. From the pipe pipe bend 35 m, 10 m and 70 m Settings lifting

point, have four lifting point. Lifting point and pipe welding is firm.

Through inspection after the acceptance of the pipe assembly, in a timely manner, both

inside and outside the anti-corrosion, then do hydrostatic test until they have passed the

water pressure test for piping and float. Pipeline floating before the water intake port with flange bolt head plate to block, welding steel plate on the riverbanks end wall plate, on the

wall board is equipped with vent hole ~ 1 1/2 "inch in diameter and inlet opening, and gate

valves.

According to the normal weight and distance from the river pipe to choose the appropriate

lifting crane. Using four cranes lifting water at the same time, the designated persons

command when lifting, lifting must be synchronous, lest cause lifting out of sync and

wreck a pipe. Trial lift before lifting, and confirm that each state of crane lifting and can

guarantee normal synchronization.

The pipeline condolence to the surface of the water, dragging pipeline to the pipe laying

barge with prepared position of the surface of the water, with prepared four floating crane

fasten hoisting wire rope, hang on the pipe. Under the head of the elbow pipe mouth is

already installed for water head casing pipe placeholder, review the pipe axis,, open pipe

port of the gate, after confirmed to the pipe irrigation, irrigation of the short tube is

equipped with a water meter, when the pipeline gravity plus irrigation water buoyancy to

stop water, once again, correct the pipe axis, and then let the pipeline slowly sinking,

sinking in place, the pipe falls on steel pipe pile bracket slot, the position of divers in the

water to check pipeline and pile foundation position, the pipeline for water head straight

well as confirmation of water head box after the placeholder and axis to the pile brace axis

coincidence, divers in the water will support the steel pipe fittings pipe installation is firm,

then loosen the hoisting wire rope, floating crane. Once again, tighten bolts pipe all

fittings.

The pipeline steel wire rope of the ship every 100 mm with marked red tie, as a symbol of

sinking pipe line, must set up a special command, all floating crane falls as the scale and

length of rope according to command gestures and interphone coming from order

execution, it is forbidden to steal less fall and fall and fall. The speed of the fall line slow

and uniform.

Seven days before the pipeline floating in the channel, navigation administration

department, and their consent to do a good job in all procedures, in accordance with the regulations of the waterways, the partial closure of navigation channel department.

Two pipe arranged in a sink, sink is a tube in place, then sank another pipe.

After two pipeline construction and well versed in all pipes and after comprehensive

pipeline testing, cover the divers in the water for water head of flowing concrete cover

plate.

Submarine orair pipes installation deviation wind allowed in the table below.

Submarine orair pipes installed allowable deviation

Project allows deviation (mm)

Axis location 150

High range + 100

8.3.4.2 immersed tube construction labor organization and quality control measures

(1) labor organization

(2) security measures

1) underwater operation personnel for special training

(2) technical director responsibility system, security, scientific research and other relevant

personnel are thorough site command, in solving engineering technology, security and

other issues.

(3) safety education: to the principle of "safety first, prevention first", insist on a day before

going to work safe speech system, for a day of work safety and quality measures are put

forward.

(4) strengthen the site inspection, found hidden dangers rectification immediately, to

achieve safety and quality standard rear can continue the construction.

(5) adhere to the "show certificates", especially the divers underwater construction, strong

without high blood pressure, heart disease, after having obtained the certificate of

approval, trained with underwater operation skills to work. Inspectors and supervision

engineer need to check the engineering quality, the water also need to master a certain

knowledge of diving and reliable protective measures, dressed in diving suits, launched for

inspection.

6 carrier, boat hull should be configured on a sufficient number of life-saving equipment,

such as life jackets, life buoy, etc. The ship staff have to wear a life jacket, prevent fall stop

drowning accidents.

All landowners divers underwater construction which realize unified regulation, signal, in

case of extrusion collision accident. Was a diver meals during working level should be improved, shore to have enough time to

guarantee, to ensure that the energy of the water again.

Pet-name ruby when wind magnitude, the larger spray water and the underwater work is

strictly prohibited.