BORED PILING WORK SEQUENCES
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- เผยแพร่เมื่อ 4 ก.ค. 2024
- This video visually explains the sequences of the Bored Piling works.
Bored piles, also known as replacement piles, are a commonly-used form of building the foundation that provides support for structures, transferring their load to layers of soil or rock that have sufficient bearing capacity and suitable settlement characteristics.
Bored piles are piles where the removal of soil forms a hole for a reinforced concrete pile which is poured in situ. The soil is replaced by the pile, hence 'replacement' piles as opposed to displacement piles where the soil is forced away by driving or screwing the pile.
Bored piles are used primarily in cohesive subsoils for the formation of friction piles and when forming pile foundations close to existing buildings. They are popular in urban areas as there is minimal vibration, where headroom is limited, where there is no risk of heave, and if there is a need to vary the length of the piles.
Installation
Bored piles are drilled using buckets and/or augers driven by percussion boring (vibratory hammers) or through the rotary boring (twisting in place).
In unstable soil strata, the use of bentonite fluid assists in stabilizing the bore especially in large diameter deeper piles and allows the insertion of heavily reinforcing steel cages. This is known as flush boring (see more below).
If the boring and pouring take place simultaneously, piles are known as continuous flight auger (CFA) piles.
Piles are known as large diameter piles if they are 600 mm or more in diameter. Small diameter piles of less than 600 mm are sometimes placed in groups under a common pile cap to receive heavy loads.
Large diameter piles can have their bearing capacity increased by under-reaming the shaft at the base. This is achieved by an expanding cutting tool that cuts a conical-shaped base up to three times the diameter of the main shaft.
The form of support to the pile or borehole affects the pile formation. Bored piles can be either supported or unsupported.
Unsupported piles
Where piling is undertaken in stable soils it may be possible to bore and place the concrete without first lining the hole. However, precautions need to be taken by lining the first meter of the hole to prevent surface soil from falling into the hole.
Supported piles
There are two categories of supported pile depending on the casing or lining that is used.
Permanent casing
The borehole can be formed by the percussion method which involves a heavy cutting tool on a small tripod that is dropped from its raised position using a winch to cut out a cylinder of earth. The operation is repeated until the hole has been sunk to the required depth. As the cutting proceeds, a thin sectional lining is inserted into the hole to prevent its collapse. Alternatively, the borehole can be formed by the rotary method in which the rotary drill operates within the casing or lining.
Temporary casing
It is common for the borehole to be supported by a screw-jointed steel lining which is removed either during or after the concrete has been placed. The tube can be winched or jacked out of the ground.
Flush boring uses a fluid such as a bentonite to flush material from the hole, which has been loosened by drilling. The fluid can be poured from above (reverse flushing) or pumped through the drilling rod (direct flushing). The bored hole is lined with a temporary steel casing to prevent the collapse of loose surface soil. As the boring proceeds, bentonite is continuously fed into the hole.
At the required depth, reinforcement is lowered through the bentonite and concrete poured. The bentonite is displaced by the concrete and pumped back up out of the hole. As the concrete reaches the hole’s upper level, the temporary casing is withdrawn.
Excelente Video. mil gracias por compartir conocimiento de oro
Motivation video
Thanks for sharing 🙏👍
Thanks for visiting
This helps me a lot. Thanks
Glad to hear it! Thank you for watching. We have uploaded a new video related to Bored Piling Works. In which, we covers each and every steps of Bored Piling Works from Setting Out to Removal of Casing.
Very useful video ... thank you
Thank You
Thanks for the full video. Really hard to find this kind of video on youtube.
I have a question. I saw they welded the Rebar cage to the steel casing, what happen when they extract out the steel casing?
I often found out on site the rebar cage fall to the bottom of the piles. What might go wrong that caused this from happening?
During the extraction of the steel casing, we cut the welded rebars. So that the casing and the rebar cage will be separated and the casing could be extracted. If the poured concrete is still too wet, there may be a chance that the rebar cage can fall down to the bottom. Additional reinforcement length is usually considered above the cut-off level to avoid these issues. Even if the rebar cage goes down, it won’t affect the lapping length of the reinforcement.
For tension piles, the rebar will be provided throughout the length of the pile. In this case, if the rebar cage is not welded to the casing, it may have a chance to move upwards due to the dynamic pressure in the confined environment.
Great video for learning.
Thank you so much
Great .....keep it up...
Thank you, I will
Informative :)
Thank you
Good job, very helpful..
Thank you so much
That is a descriptive video of making bored pile....Thanks for sharing but I got a question. Those polymer liquid is added in the hole and it will be pushed out to surface by the concrete during the process of concrete casting, won't it?. Then, what does those polymer liquid do?
Yes the polymer liquid will be pushed out to surface during the process of concrete casting.
The polymer will act as a resistance shield for the soil around the bored hole. The purpose is to withstand the soft soils in the bored hole without collapsing.
Hi Thanks very much for the video. May i know what the polymer is for ? Thanks
@zklfs94
The polymer is used as the stabilizing liquid for the bored pile. The same purpose as Bentonite.
Polymer is also a drilling mud like bentonite that protect the drilling hole from collapse
Yes, Correct
Nice...Informative
Thanks
Hi, may I ask the skip that you used for topping up during steel casing extraction, is it opened by crane or by the man down there? Or can you share some detailed photos of the skip if it doesn't trouble you. thank you very much.
@Mohd Mirza Abdul Rahman, Which crane holding the concrete bucket, the worker using the rope system to open up the bucket. It's comparatively safer.
@@ProudtobeaCivilEngineer Oh i got it. Thank you for your explaination. Seems really good method compared to what my company is implying where the concrete bucket attached to a mancage for the worker to handle the skip. More hassle and concern on the safety part. Thank you very much for the sharing !
Fascinating
Thank you for watching
really good one👍
Thank you! Cheers!
A very detailed explanation. Many Thanks for posting this.. if its explained with voice that would have been MORE excellent. Can you please provide info on how much time did this process take in real time productivity with the list of resources like men and machines..
Glad it was helpful! We will try to add voice explanation in our future videos.
The productivity of the piling works for the above site is 1.5, means we can do 3 piles per 2 days time. (working hours 08:30 to 18:00)
Rock coring will kill the time, it takes around 2 for 1m rock coring.
@@ProudtobeaCivilEngineer Thanks you very much once again for your response..
How long is the steel case used in this video?
The length of the used steel casing is 12m. This is mainly because of the soft nature of the geotechnical profile. The longer casing used to eliminate the collapse of the soils during boring.
sir the rebar cage have no spacer blocks for secure concrete cover for the rebars
Kindly take a look at the video from 24:00 onwards. There are Plastic Spacers fixed to the rebar cage.
hi, may i ask for the playback speed video you use, i need it for counting the productivity of the machine by watching this video, thanks in advance
KIndly contact us.
Super big soil drill
Great job.......
Thank You
@@ProudtobeaCivilEngineer hi may i know is the replacement pile is the same as bored pile?
@@izzavinsky1198 Bored piles, also known as replacement piles.
can we do bored piles diameter 450mm without temporary casing? and how to determine whether need to use temporary/permanent casing or not.
Basic reason of providing the casing is to prevent the soft soil from falling into the pile bore. If the casing pipe is not provided , the clay or the soft soil shall keep on falling in the excavated bore of the pile and while casting the concrete, this shall get inadvertently mixed in the cement concrete.
There are temporary casings and permanent casings.
The temporary casing is a type of casing that is removed after the casting of concrete is complete, typically before the start of the final setting. As you must be well aware, the loose soil is generally found in the Initial layers of the Bore. So, in the case of a temporary casing, the casing is not much deep. If we have a deep temporary casing, it is very difficult to remove after the completion of casting.
Permanent Casing is a type of casing that is concreted with the concrete and remains there for Life of the Pile. The general practice is placing the casing before pouring the concrete so that no soil gets accidentally mixed with the concrete. These kinds of casings are seen where the soil is very loose/fine & the chances of caving of the pile are more.
informative video
Thanks
what is the depth of prebore before insert the temporary casing?
Roughly around 3m to 4m from Ground Level
Hi dear
This is nice video good, two queries I have
1. If the pile lenght is 15meter, what will be the casing pipe lenght and whether the casing pipe will be inserted prior to drilling the boring
2. When the casing pipe will be removed, that is immediately after casting right ...
Thank you.
1) The casing length depends on the soil conditions. Normally it will be provided until the hard soil layer, so that the soft soil will be resisted by casing.
The pre-boring process will be done first roughly around 4m to 6m. After that the casing will be installed. Then the boring will be continued until the required design depth.
2) Once the casting of pile completed, the casing will be removed prior to the final setting of concrete.
What is the thread to measure depth of concrete? How it is used?
It's a measuring tape. We will upload a video on this measuring tape as soon as possible. So that you can visualize it.
👍
We sell vibration hammer qpvibro.com/
Me gusta piling
This work sequence is right. However, there are many serious safety laspes. I hope such work site will have a swo by mom.
All the job sequences are to be carried out or executed in accordance to quality and safety requirement for the project specific . I observed personnel working under a suspended load, within the swing radius of the machine which placed them in a line of fire. Such project aught to implored or lash onto the services of certified safety and quality personnel.
@@sundayejigah5704 based on what u say, I guess u r not a site person. Ur theory is merely text book safety
Since I talk like tt den the collapse zone also have to take into consideration lo. Am I right?
singapore!
good
Thanks
Interesting, can anyone bring me to the site like this😍😍
Nice to hear
31:25 That's not how you conduct slump test for concrete. You don't twist the slump cone while removing it.
Thank you for your valuable comments.
project location?
May ask sir if you immediately remove the steelcast after concrete pouring
Yes we need to immediately remove the steel casing after concrete pouring.
Did they pump out the water inside the casing?
Actually it is not the water. It is stabilizing liquid (Bentonite or Polymer). Soft soils has a tendency to collapse during pile boring. To overcome this issue, the stabilizing liquids were pumped into.
@@ProudtobeaCivilEngineer thank you, so the water inside the bore hole if there is doesn't need to be pumped out at all?
what is the criteria for polymer viscosity check?
It's depends on the polymer material used. However for the above project, the viscosity of at least 60s but no higher than 100s was used as the criteria.
@@ProudtobeaCivilEngineer thanks
@@waikiankhoo8746 Welcome
Agar pile kajer khobor thaklay bolben dada
Thank you
Dear sir, is the vacancy of crawler crane operator or peeling rig operator in your company?
Not at the moment.
@@ProudtobeaCivilEngineer thank you
What is the pile diameter?
1200 mm
apa hazard yg korng nmpk kt situ? cer gtau. sbb hrtu aq ad exam sss. tp tulah keliru ah . exam yg tgok dlm vdeo
Thank you
roughly surveyed
It's not roughly surveyed. Actually we did the Setting-Out of Piles with a Licensed Surveyor. He marked the center of each piles with reinforcement bars. In order to verify the distance between two piles, we just counter-check with the measurement tape.
600mm diameter?
900mm diameter
arent you cutting tremie pipes during concrete pouring
The tremie pipes need to be cut during pouring. However, it's quite hard to take video which covers full activity. Thank you for your concern. Kindly view our latest video related to Bored Piling Works for full activity. From Setting Out to Casing Removal.
Hi, we are from China, we export piling machinery parts( drill teeth, drill bucket, core barrel, roller cone), welcome to inquire me!
Sure it's plumb, as a matter of fact it's a little better than plumb.
vibrohammer its not allowed to use near other bulding....
Normally the vibration will be measured during piling works. There is a allowable limit for vibration for each type of buildings like hospitals, commercial buildings, residential buildings etc.
@@ProudtobeaCivilEngineer can u please upload a video on that too? 'measuring vibration, during construction works.'
@@basurukodagoda6134 Sure, We will try to do
Manual bucket 😂
Hlo sir I'm a vibro hammer operator. If you need vibro hammer operator plz contact me
Thank you