RU207054U1 - Test bench for precast concrete elements - Google Patents

Abstract

The technical field to which the utility model relates relates to devices for testing precast concrete elements of industrial and civil objects for thermal conductivity and can be used in the production of building materials for individual construction. The test stand for heat-insulating paint-treated compounds was developed for carrying out full-scale tests of liquid paint thermal insulation (thermal paints) in order to determine (confirm) the physical-mechanical, chemical and technological properties.

Description

The field of technology to which the utility model belongs (hereinafter referred to as the PM): PM refers to devices for testing prefabricated reinforced concrete elements of industrial and civil objects for thermal conductivity and can be used in the production of building materials for individual construction. The test stand for heat-insulating paint-treated compounds was developed for carrying out full-scale tests of liquid paint thermal insulation (thermal paints) in order to determine (confirm) the physical-mechanical, chemical and technological properties.

Known "Method for testing building materials for thermal conductivity" according to patent RU 2018828. The aim of the invention is to expand technological capabilities by heating blanks (samples) from dissimilar building materials in the field and reducing energy costs. The goal is achieved by the fact that in the method of testing building materials for thermal conductivity by heating their samples from a heating source and holding the samples with simultaneous control of the temperature difference in the heating zone for a given time, the rate of the gas temperature drop in a special heat-insulated container, hermetically reinforced with the open side to the wall, is determined. of the sample, the obtained value of the temperature drop rate is compared with the experimental data obtained under the same conditions for materials with a known thermal conductivity, and the thermal conductivity of the test sample is determined from the comparison results, while a powder charge calibrated by weight with a means of its ignition is used as a heating source.

The disadvantage of this method is the insufficient amount of data obtained on thermal conductivity and the inability to determine the physical-mechanical, chemical and technological properties of the test samples.

The technical result consists in increasing the obtained measurement parameters and increasing the accuracy of determining the physical and mechanical properties of heat-insulating coatings on precast concrete products based on the results of field tests. The stand consists of two combined insulated standard block - containers. The stand is a structure using one-piece welded and detachable bolted joints. The tested models are installed on a prepared bed made of cement-sand mortar of grade not lower than M150. The sand-cement mixture is called a commercial building mortar, in which cement of a certain brand acts as a binder, and the aggregate is washed cleaned mountain sand of a medium fraction. The solution M 150 includes cleaned washed medium-fractional mountain sand with a fraction of 0.5 to 1.25 mm. Such grains have a dense structure and significant roughness. Unlike sea (river sand), in the mountain, there are almost no rounded grains of sand (formed by constant exposure to water). As a result, rough grains are perfectly bonded to the binder, forming a strong and durable building mixture. A distinctive feature of the M 150 solution is its long-term elasticity (even without the presence of additives and plasticizers in the mixture). In addition, this material is characterized by low hygroscopicity and, at the same time, high water-retaining properties (more than 92%). As a result, moisture from the M150 mortar evaporates slowly, which leads to a high bond strength of bricks, concrete, cellular materials and M150 mortar.

The structure, which is based on paired channels, moves on rolling supports along the guides from the channel. Dividing the space for testing models into two halves, one is designed to simulate atmospheric influences and aggressive environments (wind, humidity, negative temperature, ultraviolet, noise exposure, etc.), and the other is designed to simulate a living environment with security and comfort. for the potential stay of the person.

The drawings show: Fig. 1 is a general view of one inventory block container in perspective; in fig. 2 shows the paired block-containers in the plan, forming a test module, and a model of the test process for a reinforced concrete element (temperature, atmospheric, noise effects at negative temperatures) with an indication of the side for fixing the sensors on the test bench at positive temperatures, simulating the conditions of a person's stay; in fig. 3 shows a plan of one inventory block container with an indication of the approximate internal equipment; in fig. 4 shows a general diagram of the process of testing the properties of a prefabricated reinforced concrete element with an indication of the direction of movement of the rolling supports along the guides from the metal channel into the space between the block containers (top view); in fig. 5 shows a general diagram of the process of testing the properties of a prefabricated reinforced concrete element with an indication of the direction of movement of the rolling bearings along the guides from the metal channel into the space between the block containers (side view); in fig. 6 shows an assembly drawing of a jig on rolling supports.

The precast concrete test bench is used as follows. Preparation of a test module (thermal chamber) from paired block containers. Inventory block containers supplied to the test site, equipped with heat generators to create the required temperature and humidity conditions (1), an entrance group (11) and working lighting elements (2) are mounted in pairs in the form of a single paired block container (4) with a technological testing device. lines (3) for feeding the tested reinforced concrete panel into the space between the paired block containers (6, 14) forming the temperature chamber (5). The formed test module from paired block containers is installed on inventory racks of a telescopic structure (13), capable of adapting the height of the heat chamber rise above ground level to the dimensions of the panel under test. Paired block containers are covered with a single pitched inventory roof (10) to prevent precipitation from entering the test area of the reinforced concrete panel and create a temperature humidity regime with the possibility of dismantling for the period of movement of the conductor (12) with the test sample. Sample preparation and installation in a jig on rolling supports. After mounting the paired block containers at the required height using telescopic racks (13), a sample treated with paint thermal insulation is prepared for testing the thermal properties in the preparation zone (9). The sample is fixed in the jig (12) on rolling supports (19, 20). The structure of the conductor is a composite of twin metal channels (15, 16, 18, 21, 22) on bolted joints (17), moves on rolling supports along the guides from the channel (7). The conductor is mounted sequentially, starting from the base (22), and then covered with the upper part (15, 16, 21) after the installation of the tested element into the inner space of the conductor using a truck crane. Installation of the conductor in the thermal chamber. The assembled conductor (12) with the tested prefabricated reinforced concrete elements installed in it is pushed with the help of rolling supports (19, 20) along the guides from the metal channel (7) into the space between the block containers along the given direction vector (8). Installation of inventory pitched roof. Block containers are covered with a common pitched roof (10). Testing the thermal properties of the sample (prefabricated reinforced concrete panel, treated with paint heat-insulating compositions). The required temperature and humidity conditions are created in the thermal chamber using built-in heat generators (1).

Thus, due to the improvement of the known device, an increase in the obtained measurement parameters and an increase in the accuracy of determining the physical and mechanical properties of heat-insulating coatings on precast concrete products based on the results of field tests are achieved.

Claims (1)

A stand for testing prefabricated reinforced concrete elements, containing a heat-insulated container, hermetically reinforced with an open side to the wall of the sample, characterized in that the heat-insulated container is made in the form of a temperature chamber from paired block containers equipped with heat generators, an entrance group, elements of working lighting, sensors for obtaining information , while the block-containers are mounted with the device of the technological test line, consisting of guides from a metal channel, on which a prefabricated jig is mounted on rolling supports for installing a tested reinforced concrete element into it, consisting of twin metal channels on bolted joints and having the ability to move on rolling supports along guides for feeding the tested reinforced concrete panel into the space between the paired block containers, and the paired block containers themselves are installed on inventory racks of a telescopic structure and are covered with a single slope th inventory roof.

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