Study and renovation of historical masonry arch bridge/Istorinio murinio arkinio tilto tyrimas ir atnaujinimas/Vesturiska kiegelu loka tilta izpete un rekonstrukcija/Ajaloolise tellismuuritisega kaarsilla uuring ja renoveerimine

The aim of this research was the investigation of the properties of clay brick masonry arch bridge materials with a purpose of finding the best methods for reconstruction and renovation of the structure. The restoration, reconstruction and upgrading of historical heritage bridges require a careful investigation of materials and causes of damages. In many cases, the use of incorrect composition of joint mortar and clayed brick may lead to unfavourable result. It is important to ensure the natural water migration in historic masonry as it should not be interrupted after restoration or reconstruction measures performed. As an example the results of investigations and upgrading of historical clayed brick masonry bridge over the Venta River in Kuldiga town in Latvia had been analyzed. During the long lifetime and pro-active maintenance polity, the bridge had a lot of damages that could affect its further service life. For geometrical data collection laser scanning method was used that ensures sufficiently accurate data for reconstruction design, as well as the information for architectural investigation. Three-dimensional scanning of the heritage structure using 3D laser scanners allows the further transformation of information into the surface mesh model. This paper presents results of the investigation, and design of restoration and reconstruction works. Keywords: masonry arch, bridge, brick, mortar, material investigation, reconstruction. Sio tyrimo tikslas--istirti murinio arkinio tilto medziagu savybes, ieskant geriausiu metodu rekonstruoti ir atnaujinti si statini. Atstatant, rekonstruojant ir atnaujinant istorinio paveldo tiltus butina kruopsciai istirti naudotas medziagas ir nustatyti statinio pazaidu priezastis. Daugeliu atveju neteisingas skiedinio ir moliniu plytu sudeties naudojimas gali duoti neigiama rezultata. Svarbu uztikrinti naturalu murinio statinio vandens judejima, kuris negali nutrukti atlikus atnaujinimo ar rekonstravimo darbus. Kaip pavyzdys pateikta istorinio paveldo murinio arkinio tilto per Ventos upe Kuldigos mieste tyrimu rezultatu analize. Del ilgo gyvavimo laikotarpio ir netinkamos prieziuros tiltas turejo daugybe pazaidu, kurios galejo tureti itakos tolesniam jo naudojimo laikui. Geometriniams duomenims surinkti taikytas lazerinio skenavimo metodas, kuris garantuoja gana tikslius duomenis, reikalingus tilto rekonstrukcijos projektui, ir suteikia informacija architekturiniam tyrimui atlikti. Trimatis skanavimas, naudojant 3D lazer