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KR-20260062368-A - PORTABLE MEASURING APPARATUS OF TUNNEL TOTAL PRESSURE

KR20260062368AKR 20260062368 AKR20260062368 AKR 20260062368AKR-20260062368-A

Abstract

A portable tunnel pressure measuring device for measuring total pressure inside a tunnel is disclosed. The disclosed device includes a velgrid section (110) installed inside a tunnel and comprising a plurality of air inlet holes (113) for introducing air inside the tunnel; an atmospheric pressure tank section (120) that receives and seals air from outside the tunnel and is installed inside the tunnel together with the velgrid section when measuring total pressure inside the tunnel; a differential pressure data logger section (130) that is installed inside the tunnel together with the velgrid section and the atmospheric pressure tank section and is connected to the velgrid section and the atmospheric pressure tank to measure total pressure between the air flowing into the velgrid section and the air inside the atmospheric pressure tank section; a first hose (h1) for connecting the atmospheric pressure tank section and the differential pressure data logger section; and a second hose (h2) for connecting the velgrid section and the differential pressure data logger section.

Inventors

  • 이학순

Assignees

  • (주)범창종합기술
  • 이학순

Dates

Publication Date
20260507
Application Date
20241029

Claims (5)

  1. As a portable tunnel pressure measuring device for measuring total pressure inside a tunnel, A velgrid section (110) including a plurality of air inlet holes (113) installed inside the tunnel and for introducing air into the tunnel; An atmospheric pressure tank (120) installed inside the tunnel together with the above-mentioned bell grid section to receive and seal air from outside the tunnel and to measure voltage inside the tunnel; A differential pressure data logger (130) installed in the tunnel together with the above-mentioned bell grid section and the above-mentioned atmospheric pressure tank section, and connected to the above-mentioned bell grid section and the above-mentioned atmospheric pressure tank section to measure the total pressure between the air flowing into the above-mentioned bell grid section and the air inside the above-mentioned atmospheric pressure tank section; A first hose (h1) for connecting the above atmospheric pressure tank unit and the above differential pressure data logger unit; and A portable tunnel voltage measuring device characterized by including a second hose (h2) for connecting the above-mentioned bell grid section and the above-mentioned differential pressure data logger section.
  2. In claim 1, the bell grid portion (110) is, First to fourth main arms (111a, 111b, 111c, 111d) arranged radially so as to be orthogonal to each other, and First to fourth sub-arms (112) arranged to correspond to each of the first to fourth main arms - the first sub-arm is arranged to intersect and communicate with the first main arm, the second sub-arm is arranged to intersect and communicate with the second main arm, the third sub-arm is arranged to intersect and communicate with the third main arm, and the fourth sub-arm is arranged to intersect and communicate with the fourth main arm - and, A portable tunnel voltage measuring device characterized by including a gathering room formed at the portion where the first to fourth main arms meet, wherein a hose connection portion (115a, 115b) allowing the connection of the second hose is formed.
  3. In claim 2, the air inlet holes are, A portable tunnel voltage measuring device characterized by having at least two formed on each of the first to fourth main arms and each of the first to fourth sub arms.
  4. In claim 2, Each of the first to fourth main arms and each of the first to fourth sub arms is formed to have a first air passage (116a) and a second air passage (116b) that are partitioned by an intermediate partition (116c) along the longitudinal direction, and The above hose connection is provided with two parts—one for measuring the voltage between the air delivered through the first air passage and the air within the atmospheric pressure tank section in the differential pressure data logger, and the other for measuring the voltage between the air delivered through the second air passage and the air within the atmospheric pressure tank section in the differential pressure data logger. A portable tunnel voltage measuring device capable of measuring tunnel voltage in both directions.
  5. In claim 4, the air inlet holes include a first group of air inlet holes and a second group of air inlet holes, and At least two of the first group air inlet holes are formed in each of the first to fourth main arms and each of the first to fourth sub arms so as to face in the same direction, and A portable tunnel voltage measuring device characterized by having at least two second group air inlet holes formed in each of the first to fourth main arms and each of the first to fourth sub arms, such that the second group air inlet holes face in the same direction as each other and face in the opposite direction to the first group air inlet holes.

Description

Portable measuring apparatus of tunnel total pressure The present invention relates to a portable tunnel voltage measuring device, and specifically, to a portable tunnel voltage measuring device that enables more convenient and accurate measurement of voltage inside a tunnel. Ventilation methods for road tunnels (hereinafter also referred to simply as 'tunnels') are classified into natural ventilation and mechanical ventilation methods. The applicability of the mechanical ventilation method is reviewed by considering the required ventilation volume and required pressure rise, and the ventilation method is determined by considering the response plan in the event of a fire. The airflow within the tunnel is determined when the ventilation force acting on the air within the tunnel and the flow resistance force are in balance. The ventilation force within the tunnel consists of the traffic ventilation force naturally generated by vehicle traffic and the pressure rise force generated by ventilation systems such as jet fans, saccardos, and supply nozzles in vertical shafts, while the flow resistance force consists of wall friction resistance and resistance due to natural wind. Mechanical ventilation is adopted in cases where the pressure rise required to generate the required ventilation volume cannot be satisfied by the traffic ventilation force alone, or in tunnels where smoke control facilities must be installed according to the disaster protection grade. Figure 1 is a graph showing the pressure inside the tunnel changing according to the operation of the jet fan in relation to the generation of ventilation force inside the tunnel over time. The y-axis is the pressure axis (unit: Pascal), and the x-axis is the time axis (unit: second). The black graph (g1) is the pressure graph measured near the exit, and the red graph (g2) is the pressure graph measured in the middle part of the tunnel. The jet fan was activated at approximately 900 seconds, and pressure was increased as the jet fan was activated; however, the pressure showed a characteristic of dropping sharply as the jet fan was deactivated at approximately 2100 seconds. In addition, as can be seen from the graphs (g1, g2), it can be seen that there is a difference in the magnitude of pressure increase between the middle part of the tunnel (g2) and near the exit (g1). In this way, the difference in pressure increase due to the operation of the jet fan and the operating time of the jet fan are taken into account and comprehensively reflected in ventilation inside the tunnel or response plans in case of fire inside the tunnel. Meanwhile, FIG. 2 is a simplified modeled diagram to explain the measurement of static pressure, dynamic pressure, and total pressure inside a road tunnel. In FIG. 2, reference numeral 1 represents the inside of the tunnel, the arrow (f1) represents the airflow, reference numeral 2 represents the outside of the tunnel, and reference numerals 3a, 3b, and 3c represent simplified models of devices for measuring total pressure, static pressure, and dynamic pressure, respectively. In FIG. 2, static pressure can be measured from A, dynamic pressure from B, and total pressure from C. That is, static pressure is used to measure the pressure exerted by air pushing vertically against the pipe wall on the surface due to the airflow, and can be measured by drilling a vertical hole inside the tunnel. This generally refers to the pressure typically referred to in the Bernoulli equation, and is measured by configuring it as shown in 3b in FIG. 2. Dynamic pressure is a value obtained by converting the kinetic energy of airflow into pressure energy, and can be measured through a configuration such as 3c in Fig. 2. That is, it can be measured by installing a pipe for air intake inside the tunnel. Total pressure is the sum of static pressure and dynamic pressure, and can be measured by installing a pipe for air intake inside the tunnel as in Fig. 2, 3a, and configuring the opposite side to be exposed to the outside (external air, 2). This total pressure needs to be measured more precisely in relation to ventilation inside the tunnel and to actually enable airflow. As mentioned above, the measurement of total pressure in a road tunnel is ultimately performed by comparing the air pressure outside the tunnel (at the exit or entrance side) with the pressure difference inside the tunnel. However, since the length of a road tunnel ranges from a few hundred meters to several kilometers, in reality, it is considerably difficult to accurately measure the total pressure by connecting a hose to the exit or entrance of the tunnel and comparing the pressure difference between the outside and inside the tunnel, as shown in Fig. 2, 3a. Therefore, the total pressure is currently measured indirectly by utilizing the results of measuring static pressure and dynamic pressure. Figure 1 is a graph showing the pressure inside the tunnel changing according to the operation of th