The study about the evolution of the sewage services, since before Christ up to present days, is held on reports of interesting and curious facts. The precepts of hygiene closely related to religion are found in primordial times.
What can also be found are great proportion works sacrificing generations to be built up and which were most intended to protection, comfort and ostentation instead of sanitation itself as it is currently known. In Brazil, pioneer works started in Empire Era which made Rio de Janeiro a pattern to be followed concerning sewage systems before New York, Prague, Berlin and Buenos Aires did, as well as Saturnino de Brito's works which put the country on top notch positions for urban sanitary services at the beginning of the last century (Azevedo Netto, 1959), both deserve special honorable mentioning.
To concrete pipes industries point of view the history can be organized into four periods as they follow:
Pre-1800 Period
In the city of Nippur, situated in India, the first drainage and sanitary residues sewage gallery was executed in arches shape around 3750 B.C., in Tell-Asmar, nearby Bagdad, an underground duct for water drainage was built in 2600 B.C., and, in Rome, the "maximum cloaca", a collecting channel with 4,30m maximum diameter was built in order to drain pluvial and residual waters (Azevedo Netto, 1959).
Those channeling mechanisms were intended to remove pluvial waters and account of that the residues were laid in the streets where they got accumulated until they were conducted to channels by the rains (PCA, 1968).
As a result of that behavior, after the rains real swamps were formed with such viscous and health harming clay consistent of residues and garbage whose bad smelling was incredibly penetrating and annoying (ACPA, 1980).
That situation remained until the beginning of the XIX century when water distribution systems allowed the usage of the waters to conduct the big cities residues what made them cleaner, healthier and more attractive (ACPA, 1980).
1800 to 1880 Period
This period is stated as the birth of the concrete pipes industry on account of the public health point of view demands about water and residues treatment, and transportation sector needs, irrigation and drainage. At the beginning of the 1840s in Hamburg, Germany, the first residues collector was implanted, created by the English engineer W. Lindley (Azevedo Netto, 1959), in which residences connections were made directly into the main conductor.
The oldest record of a concrete pipes installation for sanitary sewage channeling in the USA is 1842 in Mohawk, New York (ACPA, 1980).
In 1867, armed concrete pipes were created by the Frenchman J. Monier (Azevedo Netto, 1959).
In Brazil the first net of sewage system construction was started in Rio de Janeiro in 1857 and accomplished in 1864. Due to the execution of such work Rio de Janeiro became the fifth city in the world to have started the construction of a sanitary sewage system containing collecting complexes and treatment stations.
1880 to 1930 Period
During that period a lot of advancements occurred such as modernization of sewage system and pluvial waters galleries projects and construction techniques, and production of concrete pipes by the industry. These improvements included the hydraulic theories development, concepts about acting loads in the pipe, and norms for materials and trials (ACPA, 1980).
Concerning about the resistance of the pipes (acting loads), theories to estimate those loads against a buried pipe were developed and tested within the first three decades of the XX century by researchers of the University of Iowa. The original concept developed by Marston and Anderson which was published in 1913 was later improved by Marston and Talbot. Next, Marston gathered M. G. Spangler and W. J. Schlick so that they could keep on working on the loads evaluation project and, in 1930, Marston published "The Theory of External Loads on Closed Conduits in The Light of The Latest Experiments" (ACPA, 1980).
Referring to the concrete pipes quality, a lot was done along the first years of the XX century. The biggest site of such studies was the American Society for Testing and Materials - ASTM. The history of concrete pipes patterning had a start with the foundation of the ASTM in 1898, through the C-4 study committee, which was one the first to deal with pipes, and precursor of the C-13 committee which deals with concrete pipes (ACPA, 1980).
The first test of resistance against compression was held in September 1924 in a concrete pipe with 700 mm diameter by 1,50 m length, at the American Company of Concrete Products located in Neville Island .
Due to notorious need for improvement of the industry production quality and capacity, on January 23 rd 1907 the "INTERSTATE CEMENT TILE MANUFACTURES ASSOCIATION" was formed, then in 1914 it turned out to be named as the "AMERICAN CONCRETE PIPE ASSOCIATION - ACPA". (Azevedo Netto, 1959).
Post-1930 Period
The years that succeeded The Depression and Second World War registered a relevant increase on the concrete pipes production. For example, in the USA alone the annual production doubled to four million tons a year until 1950, coming up to a production higher than ten million tons a year until 1970. By the middle of the 1970s the annual commercialization of the production exceeded a billion dollars.
In the USA, because of the increase in the restrictions related to river pollution, with special attention to sewage residues collecting and treatment, the concrete pipes producers were forced to elevate durability, resistance, uniformity in dimensions and joints, aiming to grant a good alignment with the linking of the pipes and the joints (ACPA, 1980).
In Europe, due to the crisis faced form the end of the 1980s to 1995, the market of concrete pipes was drastically affected. For this, pipes producers were forced to decrease costs and consequently forced equipment producers to develop machines which could be able to reduce pipes walls thickness, diminish maintenance costs and have higher flexibility in the production, in order to decrease the work at the production adjust of concrete pipes with different diameters (André, 1995).
Even though many of the theories had been developed before 1930, later researches contributed immensely to the improvement of the concrete pipes quality.
At the beginning of the 1950s, the joints of the concrete pipes which were executed with cement had a great evolution and came to be executed through the usage of rubber rings of various types. |