JP2011137332A - Exfoliation preventing performance confirmation method for interior material attached to tunnel backing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for confirming that the fluctuating pressure repeatedly applied to the surface of an interior material causes neither fatigue breaking of fixtures and the interior material nor separation of the fixtures from the internal wall of a tunnel during the service period of the tunnel for vehicles with the interior material attached to an internal wall using the fixtures, that is, to provide an exfoliation preventing performance confirmation method. <P>SOLUTION: Stress applied to the fixtures 3 and/or the interior material 5 by air pressure, or displacement at that time, is determined, and stress is repeatedly applied to the fixtures 3 and/or the interior material 5 regardless of the fluctuation of air pressure applied to the surface of the interior material so that the stress applied to the fixtures 3 and/or the interior material 5, or the displacement at that time, has a value obtained by multiplying the determined stress or displacement by a safety factor. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique for preventing peeling of an interior material attached to a tunnel base.

  As shown in FIG. 6, it has been proposed to cover the inner wall of the tunnel (the inner surface of the tunnel base such as concrete or steel) with an interior material such as a fireproof coating material or a reflector. For the attachment of the interior material, as shown in Japanese Patent Application Laid-Open No. 2003-239893 and Japanese Patent Application Laid-Open No. 2007-212442, an attachment tool is used (see Patent Document 1 and Patent Document 2). Examples of tunnels to which such interior materials are attached include road tunnels and railway tunnels.

  When a vehicle passes through the tunnel, dynamic wind pressure is generated, and fluctuating pressure (air pressure fluctuation) is applied to the surface of the interior material. Since the vehicle passes frequently, the fluctuating pressure is repeatedly applied to the surface of the interior material. Due to the fluctuating pressure that frequently acts repeatedly, a tensile stress that peels these members off the inner wall of the tunnel acts on the interior material and the fixture. When the fixture is pulled out due to the tensile stress or the interior material is cracked, the interior material is peeled off from the tunnel base. Then, in the first place, not only the effect of attaching the interior material is lost, but the peeled interior material or attachment hits the vehicle passing through the tunnel and may cause an accident.

  By the way, in order to confirm the anti-peeling performance of the anti-peeling connection material to prevent accidental peeling of the mortar finish layer applied to existing structures such as reinforced concrete structures, anti-peeling to the test specimens and actual structures It is proposed to attach a mortar finish layer to concrete using a connecting material, apply a tensile load or shear load to the anti-debonding connecting material, measure the maximum load and displacement at that time, and confirm that it has a pulling strength. (For example, refer to Patent Document 3).

  However, in the case of a tunnel for a vehicle in which interior materials are attached to the inner wall using a fixture, the fixture and interior materials are not fatigued and destroyed due to fluctuating pressure repeatedly applied to the interior material surface during the service period of the tunnel, and It is required to confirm that the fixture is not peeled off from the inner wall of the tunnel before starting the service.

JP 2003-239893 A JP 2007-211142 A JP 2006-83613 A

  The present invention solves the above-mentioned problem, that is, the present invention is a vehicle tunnel in which an interior material is attached to an inner wall by using a fixture, and is mounted by a fluctuating pressure repeatedly applied to the interior material surface during the operation period of the tunnel. It is an object of the present invention to provide a method capable of confirming that the fixture and the interior material are not fatigued and that the fixture is not peeled off from the inner wall of the tunnel, that is, a method for confirming the peeling prevention performance.

The inventor of the present invention has completed the present invention as a result of diligent studies for solving the above-mentioned problems. That is, the present invention obtains the stress applied to the fixture and / or the interior material or the displacement at that time by the fluctuating pressure, and repeatedly applies the stress or the displacement at this time to a stress that takes a safety factor into consideration. And the interior material is not fatigued and the fixture is not peeled off from the inner wall of the tunnel. That is, the present invention provides the following (1) to (5) This is a method for confirming anti-peeling performance represented by.
(1) The interior material does not peel off due to the air pressure fluctuation repeatedly applied to the interior material surface of the vehicle tunnel having the following steps (a) and (b), where the interior material is attached to the inner wall using the fixture. A method for confirming anti-peeling performance.
(A) The process of calculating | requiring the stress applied to a fixture and / or interior material by air pressure, or the displacement at that time.
(B) The fixture and / or the interior material so that the stress applied to the fixture and / or the interior material or the displacement at that time is a value obtained by multiplying the stress or displacement obtained in the step (a) by a safety factor. The process of repeatedly applying stress to the interior material surface without depending on the air pressure fluctuation.
(2) The step (a) is to determine the value by measuring the stress applied to the fixture and / or the interior material by air pressure or the displacement at that time using a simulated tunnel test body. (1) Method for confirming peeling prevention performance.
(3) The step (a) calculates the stress applied to the fixture and / or the interior material or the displacement at that time from the air pressure, the static elastic modulus of the fixture and / or the interior material, and the installation conditions of the fixture. The method according to (1) or (2) above, wherein the value is obtained.
(4) The (b) step is a universal testing machine or a fatigue testing machine that repeatedly applies stress to the fixture and / or interior material, and confirms the anti-peeling performance of any of the above (1) to (3) Method.

  According to the present invention, in a vehicle tunnel in which an interior material is attached to an inner wall using a fixture, the fixture and the interior material are not fatigued due to fluctuating pressure repeatedly applied to the interior material surface during the operation period of the tunnel. In addition, a method for confirming that the fixture is not peeled off from the inner wall of the tunnel, that is, a method for confirming the peeling prevention performance is obtained. According to the present invention, in a vehicle tunnel in which an interior material is attached to an inner wall using an attachment, the attachment and the interior material are not fatigued and destroyed due to air pressure fluctuations repeatedly applied to the surface of the interior material. A method for confirming the ability to prevent peeling is obtained, which can confirm that the tool is not peeled off. Since it can be confirmed in advance that the interior material will not be peeled off by the method for confirming peeling prevention performance according to the present invention, a tunnel for a vehicle in which the interior material is attached to the inner wall without peeling off the interior material can be obtained.

It is the schematic of a stainless steel mesh. It is a typical top view of the simulation tunnel test body which attached the interior material to the simulation tunnel using the fixture. It is typical sectional drawing of a simulation tunnel test body at the time of measuring the displacement of a fixture and interior material when air pressure is applied to the simulation tunnel test body. It is a graph which shows the relationship between the air pressure applied to the simulation tunnel test body, and the distortion | strain of an interior material. It is a graph which shows the relationship between the air pressure applied to the simulation tunnel test body, and the distortion | strain of a fixture. It is a schematic sectional drawing of the tunnel which attached the interior material.

The peeling prevention performance confirmation method of the present invention includes the following steps (a) and (b), and the air pressure repeatedly applied to the interior material surface of the vehicle tunnel in which the interior material is attached to the inner wall by using the fixture. It is confirmed that the interior material does not peel off due to fluctuation.
(A) The process of calculating | requiring the stress applied to a fixture and / or interior material by air pressure, or the displacement at that time.
(B) The fixture and / or the interior material so that the stress applied to the fixture and / or the interior material or the displacement at that time is a value obtained by multiplying the stress or displacement obtained in the step (a) by a safety factor. The process of repeatedly applying stress to the interior material surface without depending on the air pressure fluctuation.

  The air pressure applied in the step (a) is the same as the air pressure (fluctuating pressure) applied to the surface of the interior material due to the dynamic wind pressure generated when the vehicle passes through the vehicle tunnel. In the case of an existing (in service) vehicle tunnel, it is preferable to use an actual measurement value. In the case of a vehicle tunnel that has not started operation, a similar known value is used, or a value obtained by simulation or the like is used.

  In the step (a), in order to determine the displacement of the fixture and the interior material, it can be measured by a conventional method using a displacement meter or a strain gauge. In each of the fixture and the interior material, the value obtained from the change in the displacement gauge value before and after applying the air pressure to the interior material surface or the strain measured by the expansion and contraction change of the strain gauge is the displacement of the fixture and the displacement of the interior material. . In order to obtain the displacement from the strain (e) measured by the strain gauge expansion and contraction, the product of the length (L0) of the fixture or the interior material in the length direction of the strain gauge and the strain (e) may be obtained.

  In addition, in step (a), in order to obtain the stress applied to the fixture or interior material, the stress applied to the fixture or interior material when the air pressure is applied to the interior material surface is directly measured by a stress gauge, pressure gauge, or the like. However, the displacement of the fixture or the interior material can be obtained, and the stress applied to each can be obtained from this displacement and each static elastic coefficient.

  In the step (b), the fixture and / or the interior are made so that the stress (Ss2) or displacement (Sn2) obtained by multiplying the stress (Ss1) or displacement (Sn1) obtained in the step (a) by the safety factor α. Stress is repeatedly applied to the material without depending on the air pressure fluctuation applied to the interior material surface. At this time, in order to repeatedly apply stress to the fixture and / or the interior material without depending on the air pressure fluctuation applied to the interior material surface, it is preferable to use a universal testing machine or a fatigue testing machine. More preferably, it is used. As a universal testing machine and a fatigue testing machine that can be used, a hydraulic type, a motor drive type (electric servo motor type), an electromagnetic type, or an air type can be used. Examples of universal testing machines and fatigue testing machines that can be used include universal testing machines such as Tokyo Tester, Instron, Shimadzu, Kokusai Keiki Co., Ltd., Maekawa Tester, or A & D. A testing machine or a fatigue testing machine is mentioned. In the step (b), it is not preferable to apply stress to the fixture and / or the interior material due to air pressure fluctuation applied to the interior material surface because it is difficult to shorten the test period. When it depends on the air pressure fluctuation applied to the interior material surface, a stress application cycle is required about 10 seconds / cycle (test frequency 0.1 Hz), but when it does not depend on the air pressure fluctuation applied to the interior material surface, 0. It is possible to set it to about 01 seconds.

  In the step (b), in order to repeatedly apply stress to the fixture and the interior material, the fixture and the interior material may be performed separately or simultaneously. It is preferable to repeatedly apply stress to the fixture and the interior material separately because the test becomes simple.

[Example 1]
Below, an example of the peeling prevention performance confirmation method of this invention which applied stress repeatedly using the fatigue tester separately for a fixture and interior material is shown below.
A stainless steel mesh (wire diameter 1.6 mm, pitch 50 mm) 2 in FIG. 1 is applied to a concrete plate (simulated tunnel: simulated tunnel base) 1 having dimensions of 60 × 600 × 600 mm, and four stainless steel anchor pins (diameter 4 mm) 3 It was attached using. The anchor pins 3 are attached so that the distance between their centers is 426 mm in the horizontal direction and 300 mm in the vertical direction. These anchor pins 3 were provided with strain gauges 4 capable of measuring the expansion and contraction of the anchor pins.

  Next, a fireproof coating material (lightweight mortar in which cement, foamed vermiculite, admixture and water were kneaded) was sprayed so that the stainless steel mesh 2 was embedded. After that, the surface was leveled with a scissors, and a layer (interior material having a thickness of 30 mm) 5 made of a fireproof coating material of 30 × 500 × 400 mm was formed on the surface of the concrete plate 1. At this time, the edge of the concrete 1 surface and the fireproof covering material layer (interior material) 5 is cut, i.e., the concrete board 1 and the fireproof covering material layer in order to prevent the fireproof covering material from directly adhering to the concrete 1 surface. A vinyl sheet (not shown) was installed at the interface with the (interior material) 5 (the surface of the concrete plate 1).

  Thereafter, a strain gauge 6 was installed on the surface of the fireproof coating material layer 5. Further, a sealing material 7 was applied in the vicinity of the boundary (periphery) between the fireproof covering material layer 5 and the concrete plate 1 to block the interface between the fireproof covering material layer 5 and the concrete plate 1 from the outside air.

  Thereafter, an acrylic case 8 of 60 × 580 × 510 mm was covered so as to cover the fireproof covering material layer (interior material) 5. A sealing material 9 was attached along the edge (periphery) of the acrylic case 8, and the acrylic case 8 was adhered and sealed to the concrete plate 1. A vacuum pump 13 was connected to the communication port 8 a of the acrylic case 8 via a valve 10 with an opening / closing controller, a vacuum gauge (pressure gauge) 11, and a regulator 12.

  Then, the vacuum pump 13 was operated and sucked to apply a negative pressure to the surface of the fireproof coating material layer (interior material) 5. After a predetermined time, the valve 10 with the opening / closing controller was opened to the outside, and the inside of the acrylic case 8 was returned to atmospheric pressure. This suction / release was repeated. One cycle between suction (loading) by the vacuum pump 13 and opening to the outside air is 45 seconds, so that the distortion of the fireproof coating material (interior material) 5 and the distortion of the anchor pin 3 (mounting tool) during loading are reduced. Measured and determined the relationship between the strain (maximum strain) of the fireproof coating material (interior material) and the fluctuating pressure (pneumatic pressure) and shown in Fig. 4, and the relationship between the strain of the anchor pin (mounting tool) and the fluctuating pressure (pneumatic pressure) Is shown in FIG. Each of the pressures in FIGS. 4 and 5 indicates the absolute value of the fluctuating pressure (air pressure).

  According to past papers, the fluctuating pressure (air pressure) at the time of passing a train in a railway tunnel is about 1.8 kPa. When the distortion of the fireproof covering material (interior material) 5 and the anchor pin 3 (mounting tool) at 1.8 kPa is obtained from the relational expressions shown in FIGS. 4 and 5, the fireproof covering material (interior material) is 5 μm. (Bending strain) and anchor pin (mounting fixture) are 23 μ (tensile strain). When the safety factor (α) is 2, the strains of the fireproof coating material (interior material) and the anchor pin (attachment) multiplied by the safety factor are 10 μ (bending strain) and 46 μ (tensile strain), respectively.

The static elastic coefficients of the fireproof covering material (interior material) and the anchor pin (attachment) are 2200 N / mm ² (bending) and 193 × 10 ³ N / mm ² (tensile), respectively. The stress at the time of distortion multiplied by the safety factor of the fireproof covering material (interior material) (size: 40 × 40 × 160 mm) and the anchor pin (mounting tool) is 0.022 N / mm ² (bending stress) and 9 N, respectively. / Mm ² (tensile stress).

A specimen comprising a refractory coating material (interior material) having a rectangular parallelepiped (size: 40 × 40 × 160 mm) is controlled using a fatigue tester so that the bending stress is 0.022 N / mm ^2, and 2 million A bending load was applied at a test frequency of 5 Hz. No abnormality was observed in the specimens after the test.

A test specimen was prepared by attaching an anchor pin 3 to a concrete cube having a side of 100 mm. The specimen was controlled using a fatigue tester so that the tensile stress was 9 N / mm ^2, and a tensile load of 2 million times was applied at a test frequency of 5 Hz. No abnormality was observed in the specimens after the test.

  Therefore, when the same fireproof covering material (interior material) and anchor pin (mounting tool) as in the above simulated tunnel are installed in the same manner, the fluctuating pressure repeatedly applied to the interior material surface over a long period of time (during the tunnel service period) It was confirmed that the fixture and the interior material were not damaged by fatigue and that the fixture was not peeled off from the inner wall of the tunnel.

  The peeling prevention performance confirmation method of the present invention can be used for road tunnels and railway tunnels.

1 Concrete board (simulated tunnel: simulated tunnel foundation)
2 Stainless steel mesh 3 Anchor pin (mounting tool)
4 Strain gauge 5 Fireproof coating layer (interior material)
6 Strain gauge 7 Sealing material 8 Acrylic case 9 Sealing material 10 Valve 11 Vacuum gauge 12 Regulator 13 Vacuum pump

Claims (4)

Confirmed that the interior material does not fall off due to the air pressure fluctuation repeatedly applied to the interior material surface of the vehicle tunnel having the following steps (a) and (b), where the interior material is attached to the inner wall using the fixture. How to check the peeling prevention performance.
(A) The process of calculating | requiring the stress applied to a fixture and / or interior material by air pressure, or the displacement at that time.
(B) The fixture and / or the interior material so that the stress applied to the fixture and / or the interior material or the displacement at that time is a value obtained by multiplying the stress or displacement obtained in the step (a) by a safety factor. The process of repeatedly applying stress to the interior material surface without depending on the air pressure fluctuation.   The step (a) uses the simulated tunnel specimen to determine the value by measuring the stress applied to the fixture and / or interior material or the displacement at that time by air pressure. How to check the anti-peeling performance.   (A) By calculating the stress applied to the fixture and / or the interior material by the air pressure or the displacement at that time from the air pressure, the static elasticity coefficient of the fixture and / or the interior material, and the installation conditions of the fixture, The method according to claim 1 or 2, wherein the value is obtained.   4. The method for confirming anti-debonding performance according to claim 1, wherein the step (b) repeatedly applies stress to the fixture and / or the interior material by a universal testing machine or a fatigue testing machine. .

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