Engineering Quality Common Problem Series (1) - Civil Work

7/21/2019 Engineering Quality Common Problem Series (1) - Civil Work

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Huawei Confidential

Engineering Quality common problems

Civil Work


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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

Picture Case of Common Engineering Problem Civil Work

Page 2

The common problems of civil work

The type of problem The standards of Quality Check method

The strength of basement

1The base of tower falls intocrack

2The sustainable cement blockis cracked

3The base of the tower settles

1The strength of the concrete should meet thedesign requirements. The strength after 28-day

maintenance should not be less than C20.2Cement, water, sand, gravel and additives forthe concrete and mixing ration should meet the

design requirements

3The base backfill records are complete andcorrect

1Reboundinstrument2check the deliveryinspection report

3Check the recordsfor the concealed

project

The surface of base:1 concave, spongy surface2crack, defects of appearance

Check the appearance of the base: No concave,

spongy surface, crack (crack on the surface

1mm), defects of appearance, etc.

Visual measurement

Tape measurement

Design of civil work1The support of tower base does notmeet with the requirements

2The support of ladder does not meetwith the requirements

3The rabbet of feeder does not meetwith the requirements

All installation should meet the design

requirements

Visual measurement

Check against the

drawing

Fence1The spray paintcoatingdont meet with the requirements2No grounding

1The coating of the Fence componentcomplies with the design and specifications

requirements

2The spray paint of the Fence componentcomplies with the design and specifications

requirements

Visual measurement

Check the records for

the concealed project


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Problem:The

cracked

concrete

probably

shows the

badstrength of

the base.

The strength of the concrete

Cracked surface of the base

Suggestion:1.Test the

strength of the

base;

2.If the strength

meets the

requirement,

repair the base,

otherwise

rework.


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Page 4

Problem:

The

sustainable

cement

block is

cracked


The sustainable cement block is cracked

Suggestion:

1.Test the

strength of the

base;

2.If the strength

meets therequirement,

repair the base,

otherwise

rework.


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Page 5

Suggestion:

Repair the base

and make sure

the base is firm.

Problem:

The base of

the tower

are not

rammed

down with

soil and

sink


The base of tower settles


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Suggestion:Remove the scratch

and rework.

Problem:Separation of the top

layer from the base of

the slab by a thin layer

The surface of the base

The defects of appearanceProblem:The surface is uneven.


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Suggestion:

1.Repair

2.Pay attention

to the curing

duration3. The step

should be under

the eave

according with

the design

Problem:

Surface

collapse


Disintegration of the surface


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Page 8

Suggestion:

1.Test the

strength of the

base;

2.If the strength

meets the

requirement,

repair the base,

otherwise

rework.

Problem:

The surface

is spongy.


Spongy surface


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Suggestion:1.Test the

strength of the

base;

2.If the

strength

meets therequirement,

repair the

base,

otherwise

rework.

Problem:

Separation

of the top

layer of

the slab

from the

base ofthe slab by

a thin

layer


Delamination


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Problem:

The base is

unstable.

Design of civil work

The support of ladder dont meet with requirementsSuggestion:Make a concrete

base.

Pi t C f C E i i P bl Ci il W k


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Design of civil work

The cable trough dont meet with requirementsProblem:

The

support of

the trough

is unstable.

Suggestion:

Make a

concrete

base to

support the

trough.

Pi t C f C E i i P bl Ci il W k


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Fence installation

The spray paint of the Fence component dont meetwith the requirements

Problem:

The paint

comes

unglued.

Suggestion:

Clean the

bar and

repaint.



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Page 13

Appendix1 Tower-Civil Work Checklist

Problem type Check Item

A

The examination records for the concealed project are complete and correctinclude1The pit (ditch) examination records for the groundwork are complete and correct 2The examination records of steel bars are complete and correct3The template records are complete and correct 4The concrete records are complete and correct5The base backfill records are complete and correct

A The dimensions of tower base section should meet the design requirements, and thetolerance should be +15/-10mm

B Check the smoothness of the towerbase surface. The deviation should be 5mm

B Check the appearance of the base: No concave, spongy surface, crack (crack on the surface1mm), defects of appearance, etc.

B The intensity of the concrete should meet the design requirements. The intensity after 28-day maintenance should not be less than C20.



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Appendix2 Shelter-Civil Work Checklist


AThe examination records for the concealed project are completeincludeThe pit (ditch) examination records for the groundwork are complete

The concrete records are complete

ACheck the appearance of the base of the equipment room: No concave, spongy surface,

crack (crack on the surface 1mm), defects of appearance, etc.

BThe dimensions of base section of the equipment room should meet the design

requirements, and the tolerance should be +15/-10mm

BCheck the smoothness of the base surface of the equipment room. The deviation should be

5mm



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Appendix3 Transmission Room-Civil Work Checklist


A Brick laying records are complete

ACheck that the dimensions and azimuth of the equipment room meet the design

requirements

A Check the verticality of each wall. The allowable deviation is 10mm

B

Smoothness of the surface (the allowable deviation for the cement mortar is 4mm; the

allowable deviation for the terrazzo is 3mm; and the allowable deviation for the ground tile

is 2mm)



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Appendix4 Solar energy-Civil Work Checklist


A The concrete records are complete and correct

B

For the cement base on the floor: The distance to the floor, the intensity of the base and the

level deviation should conform to the design requirements. The level deviation of the base

should be no more than 3mm/m; For the overhead cement base:Check whether the

installation holes match the equipment against the construction drawings. The level

deviation of the platform should be no more than 3mm/m

BThe coating of the Fence component complies with the design and specifications

requirements

The spray paint of the Fence component complies with the design and specifications

requirements

Engineering Quality Common Problem Series (1) - Civil Work

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