Floating road construction on soft soil

The main problem of road construction on saturated soft soils is due to their low bearing capacity and large settlement. One of the solutions to such problems is to install piled box culverts-geofoam. In this study, the pile box culvert-geofoam was modelled as raft foundation. This experimental study was conducted by making a prototype raft file foundation gradually loaded with a maximum vertical load of 20 kN. Different thicknesses of geofoam were utilized in order to observe the influence of thickness on the settlement. Furthermore, difference in settlement is also found when the culvert was constructed with and without geofoam. Thicker geofoam was observed to result in smaller settlement.

Force Analysis of Supporting System during Form-Work Construction of Box Culvert without Tie Rod

In the construction process of box culvert form-work without tie rod, the stress state of its supporting system is of great importance. Based on a construction project for the box culvert without tie rod form-work, this paper studied the force characteristics of diagonal braces during the concrete pouring of the box culvert. The force calculation theory of the support system was analyzed and the force was analyzed using the finite element software Midas Civil. The results showed that when the distance between the connection point of the diagonal brace and the foundation was 1 m, the diagonal brace cannot provide effective support for the template, and when the distance between the connection point of the diagonal brace and the template is 2 m, 3 m, and 4 m, the diagonal brace can provide effective support. It was recommended that the diagonal brace connection point is 3 m away from the template as the optimal diagonal brace layout position. It is recommended to strengthen the area of increased local deformation of diagonal braces to a certain extent according to the calculation results of this finite element analysis to improve the safety performance of the entire structure. The research results of this paper can provide reference for follow-up similar construction problems.

ANALISIS PERKUATAN DAN PENANGANAN TIMBUNAN BADAN JALAN TOL TRANS SUMATERA SEKSI V PEKANBARU-DUMAI DENGAN STRUKTUR PILE EMBANKMENT

Jalan Tol Trans Sumatera Pekanbaru-Dumai merupakan ruas jalan tol utama karena digunakan untuk mobilisasi dan bisnis kota Pekanbaru-Dumai. Timbunan pada badan Jalan Tol Trans Sumatera merupakan faktor penting untuk struktur geoteknik di sekitar lereng yang berada di badan jalan tol. Timbunan tanah pada badan jalan tol digunakan untuk pencapaian elevasi akhir subgrade tanah. Pengaruh analisis stabilitas lereng serta penurunan konsolidasi tanah sangat berpengaruh pada analisis struktur geoteknik untuk timbunan tanah. Permasalahan yang terjadi adalah terjadi penurunan yang disertai kelongsoran sebagian lebar badan jalan di STA 79+ 615. Jalan Tol Trans Sumatera Seksi V Pekanbaru-Dumai dan box culvert tanah dasar mengalami penurunan. Kerusakan yang terjadi pada kedua lokasi berupa penurunan disertai retakan arah jalan dengan pergeseran tanah kearah samping (longsor). Analisis terhadap sisi geoteknik menggunakan perkuatan salah satunya menggunakan struktur pile embankment. Pada analisis perkuatan dan penanganan timbunan menggunakan struktur pile embankment akan dilakukan analisis faktor keamanan timbunan jalan. Parameter perkuatan dan penanganan timbunan tanah (sudut geser dalam, poisson ratio, kohesi, modulus elastisitas, dan muka air tanah) dapat digunakan untuk analisis struktur geoteknik berikutnya. Analisis perkuatan akan menggunakan aplikasi Plaxis (program analisis geoteknik dengan basis finite element method). Direncanakan untuk pile embankment dengan tipe spun pile dapat mencapai nilai safety factor 1,5 (faktor keamanan terhadap stabilitas global minimum SNI 8460-2017) dan mencapai nilai safety factor 1,1 (faktor keamanan terhadap beban gempa SNI 8460-2017) dengan dimensi spun pile diameter 60 cm, panjang efektif 10-12 meter dengan jarak spasi antar spun pile adalah 3 meter, dan tebal LTP (Load Transfer Platform) sebesar 1,8 meter.

Analysis of Vertical Earth Pressure Acting on Box Culverts through Centrifuge Model Test

Due to the lack of surface space, most structures are heading underground. The box culvert is underground infrastructure and serves to protect the buried structure from the underground environments, but it has a different characteristic from other structures in that the inner space is empty. Therefore, in this study, the vertical earth pressure which is the most significant effective stress acting on a box culvert was measured by conducting a geotechnical centrifuge model test. A box culvert was installed following the embankment installation method, and the vertical earth pressure acting on it was measured considering the cover depth, gravitational acceleration, and loading and unloading conditions. The soil pressure measured was greater than the existing theoretical value under high cover depth and the unloading condition, which is considered as the variability of many soils or the residual stress acting under the loading condition. Finally, a goodness-of-fit test was conducted as a part of variability analysis. The measured earth pressure was found to be considerably larger than the existing theoretical value, and the variability was large as well. This means the existing theoretical equation is under-designed, which should be reflected in future designs.

PENETAPAN DURASI CRASH DENGAN METODE LINEAR PROGRAM UNTUK PROYEK PEMBANGUNAN BOX CULVERT NO 409 PADA JALUR KA DI DAOP 3 CIREBON

Tujuan utama dari suatu proyek ialah menyelesaikan proyek tersebut sesuai dengan durasi dan biayanya. Durasi penyelesaian proyek tersebut disebut sebagai jalur kritis yang dipengaruhi oleh volume pekerjaan dan produktivitasnya. Durasi normal proyek merupakan waktu yang diperlukan untuk menyelesaikan kegiatan dengan sumber daya yang ada (tanpa input tambahan), sedangkan normal cost merupakan biaya yang diperlukan untuk durasi normal. Data durasi normal dan normal cost umumnya diperoleh dari statistik terhadap proyek-proyek serupa yang pernah dilaksanakan. Karena adanya tujuan tertentu, durasi tersebut memungkinkan untuk dipercepat dengan input tambahan, ini disebut sebagai crash program. Pada Proyek KA terdapat aturan bahwa pelaksanaan konstruksi tidak boleh mengganggu operasional KA apalagi sampai memberhentikan atau menutup jalur KA, sehingga Pembangunan Box Culvert No 409 harus dilaksanakan secepat mungkin. Berdasarkan statistik proyek sebelumnya, maka proyek ini direncanakan selesai dalam 92 hari kalender, namun dapat dipercepat menjadi 92 hari kalender

Handling of The Environmental Drainage System In Jembrana District, Bali Province

The rapid growth of the urban population should be followed by the provision of basic infrastructure and facilities inadequate residential areas. One of them is the facilities and infrastructure for the environmental drainage system in residential areas to be free from standing water, especially during the rainy season. In Jembrana Regency, especially in Negara city and its surroundings, there are fourteen inundation points spread over 3 (three) districts. Drainage treatment is carried out by ranking priority scales based on inundation parameters. The parameters are inundation of height, length, frequency, and also the loss parameters due to inundation of economic facilities, public facilities, transportation facilities, housing, and casualties. With limited funds available, detailed planning is carried out on three inundation points with the highest priority score. The analysis shows that three inundation points receive priority for handling, namely Baler Bale Agung village’s environmental drainage system, Dauh Waru village, and environmental drainage Loloan Timur village. The drainage construction system uses an open channel with a U-ditch type and a box culvert with freecast concrete’s quality value of K-350.

Perancangan Dimensi Saluran Drainase Melalui Metode Rasional (Studi Kasus Drainase Di Kota Bekasi)

Sistem drainase yang berfungsi secara optimal pada suatu wilayah kota menjadi persoalan krusial. Kondisi eksisting drainase dengan penampang terbuka yang memiliki konstruksi batu kali dengan dimensi trapesium lebar atas 1.30 Meter dan lebar bawah 0.80 Meter dengan kedalaman 1.20 meter. Saat curah hujan tinggi, sering terjadi genangan air yang diakibatkan oleh dimensi saluran yang tidak memadai, tersumbat sampah dan utilitas sehingga terjadi penumpukkan proses aliran air pada area tertentu. Tujuan yang ingin dicapai adalah untuk meningkatkan aliran air secara optimal. Metode mengatasi persoalan drainase yang terjadi yaitu dengan menggunakan metode rasional. Hasil penelitian menunjukkan bahwa dengan menggunakan kala ulang 25 tahun pada area 62 hektar (0.62 km2) diperoleh model drainase melalui perubahan dimensi pasangan batu yaitu panjang 438 meter, lebar bawah 1.60 meter dengan lebar atas 2.20 meter serta kedalaman 2.53 meter, untuk dimensi crossing menggunakan box culvert 2.00 meter x 2.00 meter panjang 15 meter, sedangkan dimensi konstruksi uditch 2.00 meter x 2.00 meter dengan panjang 305 meter. Disimpulkan bahwa rekayasa dimensi drainase mampu meningkatkan kapasitas aliran air secara optimal dengan melakukan integrasi drainase sampai badan penerima air kali bekasi.

Comparative Analysis of Two cell and Three cell Box Culvert for Different Aspect Ratio

Culverts serves primarily as the hydraulic conduits conveying water from one side of a roadway or similar traffic embankment to the other; therefore, culverts serves the dual purposes of functioning as hydraulic structures as well as acting as traffic load bearing structures. They are normally cheaper than bridges, which make them the natural stream passes through channels. Box culvert are most stable and safe among various types of culverts. It can be constructed for soft soil conditions also. Therefore these are the best alternative to the major bridges for the small span and for cross drainage situation. In this work, we analyze the R.C. box culvert of two cell and three cell with different L/H ratio with the use of STAAD Pro software. In this study, we consider the span of culvert bridge as 10 m and we done the analysis for two cell and three cell culvert on the same span and varies the height with respect to span of the culvert bridge for different aspect ratio. Here we considered the traffic loading of Class AA loading as per IRC:6 2014 and also consider all the loading conditions as per IS codes. The structure designing includes the considerations of pressure cases (Box empty, Full, surcharge load) and factors such as Impact load, Braking force, Dispersal of load through fill, Effective width, Coefficients of earth pressure, Live load etc. The analysis of structure as per limit state method IS 800-2007. The IS standard requirements in the design manual for roads and bridges (IRC6-2014, IS 112-2011) is used in the structural designing of concrete box culverts. The structural elements of two cell and three cell Box culverts are compared with respect to its maximum moments respectively for the different L/H ratio on the same span of the culvert. In the results we conclude that the moments are less than the two cell Box culvert with comparison to three cell Box culvert for the constant span of both the cases of culverts. In the present study, this paper provides full discussion on the provisions in the codes, considerations and justifications of all the above aspects of design. Keyword: Box culvert, aspect ratio, Staad pro, IRC codes.

Effect of Kandangan Pump House on Long Storage Diversi Gunungsari in Sememi

The Surabaya City Government has built a box culvert in the Gunungsari Diversi channel for the Sememi segment to Banjar Sugihan and the Kandangan pump house. The purpose of this study is to describe and analyze the operational impact of the Kandangan pump on the Sememi box culvert capacity. Therefore, the Surabaya City Government built the Sememi box culvert as a long storage in the primary channel of the Gunungsari diversion in order to reduce inundation as well as function as a road that can overcome congestion in the area. The Surabaya City Government has also built a Kandangan pump house as an outlet rather than a long storage at the Gunungsari version. The reduction of inundation and congestion can increase the wheels of the economy which have a global impact on cities around Surabaya as well as a smoother access road for the people in West Surabaya to the middle of the city.