The field internship process is conducted in the Yogyakarta – Bawen Toll Road Development Project (Package 1 Section 1) for 2 (two) months as one of the graduation requirements applicable to the Civil Engineering Study Program, Department of Engineering Construction, Faculty of Engineering, Atma Jaya University Yogyakarta. Luky Handoko, S.T., M.Eng., as Dean of the Faculty of Engineering, Atma Jaya University, Yogyakarta. Eng., Ph.D., MECRES as Head of Civil Engineering Program at Atma Jaya University, Yogyakarta.
Henda Febrian Egatama, S.T., M.Eng., as On-Site Internship Coordinator for the Civil Engineering Degree Program at Atma Jaya University, Yogyakarta. Atma Jaya University Yogyakarta Faculty of Engineering Personnel Department who assisted in the administration. Finally, I hope that this report will provide insight and benefit to the readers, especially the civil engineering students at Atma Jaya University, Yogyakarta.
- Background
- Project Location
- Data Collecting Method
- Direct observation to the field during on site practice for approximately 2 (two) months
- Direct explanations from field supervisors and workers in the field
- Documentation of the project progress in the field
- Shop drawings and data obtained from the parties that involved in the project
- On Site Practice Activities
Data required when preparing the report - data that can support the content of the report. The authors also perform laboratory tests such as the CBR test and the Proctor test, as well as field observations that include the DCP test, the Sandcone test, and the Trial Compaction Test.
- Company History
- Project Organization Structure
- Project Owner
- Planning Consultant
- Supervisor Consultant
- Contractor
- Project Manager
- Site Manager
- General Manager
- Project Director
- Project QHSE Manager
- Quality Assurance
- Quality Control
- HSE Supervisor
- Project Construction Manager
- Project Procurement Manager
- Procurement Officer
- Scheduller
- ADM, Reporting, DMS
- Risk Manager
- Project Engineering Manager
- BIM Modeller
- ACAD Drafter
- Construction Engineer
Some of the projects that have been completed include the construction of the Mojokerto-Kertosono toll road. The guiding consultant is an interdisciplinary organization or person who works for and on behalf of the project owner (the owner). Provide recommendations to the progress report for the work in progress to request the project owner (Owner) for funds to finance the completion of the further work.
Project Director leads the overall implementation of the project so that it proceeds in accordance with the planning of costs, time, quality and project execution systems to achieve the set goals. Execute and monitor all phases of the project according to the quality plan made. Carry out final follow-up on the results of the assessment of the implementation of the Quality Management System in the project.
Tools and Material Specification
- Construction Tools
- Construction Materials
The following are the tools that will be used in the construction of the Yogyakarta – Bawen Section 1 Toll Road Construction. For this purpose, it is necessary to know the bearing capacity of the ground on which it stands, so that the most suitable type of foundation can be determined. Boring logs are used in testing to determine the condition of the lower soil layers to the hard ground found.
The boring test is a test to determine the condition of the soil of any layer, starting from the surface to the solid soil. The PDA test tool is a tool used to determine the bearing capacity of a foundation that has been made against existing soil conditions. Then the purpose of this PDA test is to prove the planned bearing capacity of the pile foundation with the actual (installed) conditions.
In this project, a water passage is used to determine the final position of the cap that will be made at the project work site. The sand cone is the test tool used in this case is to determine the density of the soil layer in the field using sand, whether it is a layer of soil or compacted soil pavement. Tremie pipe is a pipe used to adjust the height of the drop of concrete at the time of pouring.
A tremie tube is usually installed at the bottom end of the concrete box so that the concrete coming out of the box does not immediately fall down and hit the landfill. Tremie pipe, serves as a delivery aid when pouring concrete mix or mixed concrete from the bucket to the bottom of the Bored Pile hole. This concrete mixer is used for transporting ready-mixed concrete from the concrete mixing location (mixing plan) to the project location.
At the back of the truck there is a tool to distribute the concrete to the concrete pump (place to place the concrete mixture). This mixer rotates counterclockwise to remove the concrete mixture while maintaining the consistency of the concrete so it remains fluid and does not harden along the way. Casing Bored Pile serves as a Bored Pile mold with a diameter approximately equal to the diameter of the Bored Pile hole.
Pengertian dan Konsep Metode Pelaksanaan Proyek Konstruksi
Project Works Activites
- Soil Excavation and Soil Fill Works
- Bridge Work
- Box Underpass
- On Site Practice Works
Taking into account the conditions in the field, excavation work may be carried out after completion of demolition work and cleaning of the workplace in certain areas. The length of the bored pile foundation must reach a depth with the hardness level of the soil-bearing capacity required for the basic foundation of building construction. The implementation of the bored pile foundation begins with making a hole in the ground by first drilling the soil and then installing rebar in the hole followed by casting the bored pile with tremie.
Since the role of the pilot cap is very important, the method used and the execution in the field are decisive for this. The results of the analysis study of the implementation of the construction of the pile cap are in accordance with the theory and planned methods. The function of the pile cap is to accept the column load, which is then further distributed to the piles.
The CBR (California Bearing Ratio) laboratory test to which this standard relates is the determination of the CBR value of samples of soil, aggregate, or a mixture of soil and aggregate compacted in the laboratory at a specified water content. Take the test piece out of the mold and determine the moisture content in the top layer of the 25.4 mm thick test piece. Soil compaction is done in 3 (three) layers (each layer thickness is about 1.0 in.) and the number of impacts is 25 times for each layer.
The test is carried out by recording the number of blows and penetration of the cone (metal cone) embedded in the ground/foundation layer due to the impact of the rammer and then using graphs and formulas converting the penetrometer value into a value equal to the CBR value. If the results do not meet the requirements of the laboratory test, a retest is performed. One of the advantages of using the DCP test is that it is both effective in terms of processing time and inexpensive in cost.
The reading is carried out according to the water content of the laboratory, if it is not appropriate, a new test will be carried out after the location of the soil sample is processed. The sample compaction test is carried out as follows: spread the soil 1.5 to 2 times the width of the compactor wheel for a length of 50 m to 75 m. In principle, the results of the analysis of the soil physical properties in the laboratory should be able to describe the actual state of the soil physical characteristics in the field.
- General Description
- Preparation Works
- Survey
- Soil Bearing Capacity Test
- Bored Pile Work Activities
- Bored Pile Hole Drilling Work
- Bored Pile Reinforcement Work
- Bored Pile Casting Work
- Bored Pile Strength Test
- Problems During Project Work
- Troubleshooting During Project Work
If the quality of cast concrete is not guaranteed, the uniformity along the body of the bored pile will reduce the bearing capacity of the bored pile, especially if the bored pile is deep enough. Water flowing into the borehole can cause soil disturbance and thereby reduce the bearing capacity of the pile. The determination of the well point must be checked several times due to the condition of the land damaged by the drilling.
Installation and placement of the drilling tool, after the boring pile tool enters the job site, the first step is to assemble the tool and make a circulation bath (if necessary). The Sondir test or cone penetration test (CPT) is a field test aimed at determining the profile or stratification of the soil and its bearing capacity. Soil stratification and bearing capacity can be known from the combination of the readings of the end resistance (qc) and the friction of the blanket (fs).
The boring log is a test performed to determine the condition of the layers of soil layers up to the found hard soil. The first step after checking the drilling log is the work of drilling holes for the location of the bored pile to be made. Bored pile casting begins by pouring concrete into the tremie hopper, which is then channeled to the bottom of the borehole so that the water and mud in the drilled hole can be pushed out of the hole.
It should be noted that when pouring is carried out, it must be carried out continuously and not interrupted to avoid hardening of the concrete before the bored pile is completely cast. The casting is carried out using a tremie tube whose length reaches the bottom of the borehole, ensuring the continuity of the concrete pouring. In Bored Pile work, there are several tests that must be performed to test the safety of the Bored Pile itself.
A foundation plan can be said to be correct and safe if the load transferred from the foundation to the soil does not exceed the resistance of the soil itself (the soil is still in a state of elasticity/yielding when loaded).
Conclusion
In terms of safety, the provision of PPE in this project was very good, but during the implementation of the work there were workers who were not aware of the importance of PPE, so there were some workers who did not use PPE but received strict measures immediately. in the form of a warning from the implementer and Occupational Health. The purpose of using a borepile foundation is of course so that a construction project can be built solidly. The use of borepile foundations when the surface structure of the soil is not strong enough to withstand very large loads so that by using this foundation the stability of the structure is better preserved.
So with the use of bored pile foundation in accordance with the conditions in the field.
Suggestion
