The Construction Countermeasures of Shallow-Buried Small Spacing Tunnel Undercrossing Cultural Relic Buildings: A Case Study

Based on the background of the reconstruction project from Changqing Chenzhuang-Pingyin section of G220 east-deep line in China, a special tunnel structure and construction plan was carried out according to the construction measures of the shallow-buried small spacing tunnel passing underneath cultural relic buildings, and a comprehensive deformation control scheme of “CRD construction method single-arm excavation + surface grouting prereinforcement + advanced large pipe shed presupport” was put forward. The results of numerical simulation and on-site construction monitoring showed that the overall deformation of aqueduct foundation generally increases first, then decreases and increases again, and finally tends to be stable. The effects of surface grouting prereinforcement and advance large pipe shed presupport are obvious. The comprehensive deformation control scheme can ensure the safety of the existing construction and meet the safety prevention and control requirements.

Evaluating the Behavior of Embankments after Widening considering Soil Consolidation and Splicing Mode

Increased traffic volume has made it necessary to increase highway capacities by widening embankments and pavements. Differential settlement of foundation consolidation and rational utilization of existing embankments are the main problems encountered in road reconstruction. In this paper, the finite difference method is used to simulate the construction process of using the existing embankments directly in the reconstruction project of expressway, and the fluid-solid coupling model of foundation settlement is established to calculate the differential settlement between foundation and subgrade. The influence of road widening mode and embankment height on differential settlement is analyzed. The mechanical response of subgrade under differential settlement is simulated and the law of uneven settlement of main reconstruction forms is investigated. The dynamic response of existing embankments soil under the action of rammer is systematically evaluated. The results show that, with the increase of consolidation time, the differential settlement is gradually obvious at the junction of the new and existing embankments, and there is a possibility of landslide along the junction of new embankments, which should be dealt with in engineering. The smaller the height difference between the existing foundation and the new foundation is, the more the position of the maximum settlement point of the foundation moves towards the new foundation. The greater the height of the new subgrade is, the greater the uneven settlement is. The criterion based on the single rammed energy and compaction stopping standard is proposed to determine the reinforcement depth of existing embankment.

A People’s process: Post-tsunami self-build housing in Tamilnadu (2005-08)

This essay elucidates some of the lessons learnt from the community participatory process adopted by Artes, in the Post- Tsunami housing reconstruction project at Nagapatinam, Tamilnadu (2005-08). The program was a self-build process, respectful of gender. A pragmatic assessment of regional technologies, materials and skills was undertaken. The technological assessment was conducted by the community, in collaboration with structural engineers. Projects under consideration are in Sirkazhi Taluk and Akkaraipettai, Nagapatinam region in Tamilnadu, which had been adversely affected. The projects were nominated as best practices by the UNDP, India (2008) for community participatory processes. It inspired a new sense of belonging and confidence in the community. Besides indigenous construction practices, the community was provided an opportunity to learn new construction skills that they desired, which were beneficial in the longer term. The new construction skill sets ensured the community was independent to build their own dwellings incrementally in later years. The community was no more at the mercy of external contractors. The design of the dwellings also enabled future incremental growth. This research highlights some of the lessons in capacity building of communities; using construction skills to enable them to rebuild their own homes, as well as be self-reliant in future extensions and additions

OPTIMAL CONSTRUCTION AND TECHNOLOGICAL SOLUTION FOR RECONSTRUCTION OF A CITY PIPELINE AND THE RESULTS OF ITS TESTS

Purpose. To once again draw the attention of bridge owners and bridge experts to the problems of reconstruction of long-term bridges and on a concrete example of reconstruction of a rather problematic city overpass operated for more than 60 years to shows that with the optimal structural and technological solutions of the reconstruction received a restored bridge, and its operational and technical and economic indicators which according to the requirements of the National Building Norms completely correspond to the new bridge, but the reconstruction cost and the lead time are greatly reduced. Methodology. To achieve this purpose over the past ten years of operation of the overpass conducted three inspections and full-scale static tests. It is determined that most of the existing reinforced concrete structures, although defective and in need of repair, can be used for further operation after reconstruction, provided they are reinforced. Worn out non-repairable structures that needed to be replaced were also found. Results. According to these initial data, a reconstruction project was developed using scientific and technological structure developments of the Branch Research Laboratory 88 of Lviv Polytechnic National University for the reconstruction of bridges. The span structure has been expanded to 4 lanes from the size G-10.5 + 2 × 0.9 m to the new G-16.5 + 2 × 1.5 m in a combined way – symmetrical completion of two new beams with their support on the extended support and installation of a reinforced concrete extension board with cantilever overhangs 2.7 m long. The most damaged boundary beams were replaced with new ones, designed for normalized temporary loads A15 and NK-100. For further operation the other existing beams are reinforced in one of the least expensive ways – by changing the static scheme from the existing split to the new clamped on the supports frame-inseparable. A set of repair works is provided to ensure the normalized durability of the reconstructed overpass. The scientific novelty is to develop a method for determining the experimental Coefficients of Transverse Distribution of Bending Moments (CTDM) and external loads (CTD) based on the results of tests of the span structure. The possibility of applying the method of elastic supports for the spatial calculation of span structures with beams of different stiffness is confirmed. Practical significance. The use of optimal design solutions for the reconstruction of existing span structures: reinforced concrete billboard with large cantilever overhangs to expand and change the static scheme to strengthen the beams of span structures.

School Teachers and Soft Decolonisation in Dutch–Indonesian Relations, 1945–1949

The emergence of two states in Indonesia in the aftermath of the Second World War, namely the Republic of Indonesia and the Netherlands Indies Civil Administration, instigated a war that imposed citizenship, which schoolteachers had to choose carefully. By examining the quest for professional trajectories of Dutch and Indonesian schoolteachers during the 1945–1949 period, this paper argues that expanding citizenship fostered decolonisation through the teachers’ detachment from a shared dream of social mobility. The post–World War II reconstruction project, which is largely depicted as narratives of state building in many of the existing bibliographies, reflected a growing discontent in teachers’ expectations for economic reestablishment at the personal levels. The teachers’ detachment from a shared dream of social mobility reflected the dissolution of an imagined community where transnational cultural identities had met and melded in the early twentieth century. In contrast to the emerging historiography that emphasises atrocities and violence, this paper offers a perspective on the soft process of decolonisation.

State of reconstruction of Ukrainian multifunctional stadiums after EURO-2012

Today, Ukraine, like the whole world, is going through difficult times, the state of the economy is affected by such problems as war, pandemics. However, even greater losses are caused by often ill-considered actions, there is no strategy for the development and planning of construction and reconstruction of existing multifunctional stadiums at both the regional and national levels. The article reviews the condition of several existing multifunctional stadiums inherited from Soviet times. The fate of these stadiums is different and similar at the same time. After holding the EURO-2012 football championship, years have passed and the authors of the article are interested in the question: has anything changed for the better in the field of design and reconstruction of multifunctional stadiums. The article considers both the newly made project according to modern requirements (“CSC ZSU” stadium in Kyiv), reconstructed for EURO-2012 (“Metallist” Stadium in Kharkiv), and the stadium that needs urgent action to implement the reconstruction project (“Metallurg” Stadium in Kryvyi Rih). An analysis of the results of the competition STEEL FREEDOM is also given as an example of a modern approach to the design of new modern stadiums.