Fire resistance test structure of steel pipe gallery

Abstract

The invention discloses a fire resistance test structure of a steel pipe gallery, which comprises a heating furnace body, a hearth is concavely arranged at the top of the heating furnace body, a heating device is arranged in the hearth, a loading test box communicated up and down is arranged at the top of the heating furnace body, and the loading test box is arranged and fixed at the top of the heating furnace body. An arched pipe gallery top part is arranged in the loading test box, the two ends of the pipe gallery top part are supported and fixed to the two sides of the top of the heating furnace body, the pipe gallery top part is located above the heating device, and the side edges of the two sides of the pipe gallery top part abut against the inner wall of the loading test box correspondingly; and a soil filling layer covers the loading test box and is positioned above the pipe gallery top part. The device is simple in structure and convenient to use, fire resistance testing of the pipe gallery top part under the action of loads of different sizes and positions can be achieved, the testing result is accurate, and the testing process is safe and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of pipe gallery testing, and in particular to a fire resistance testing structure of a steel pipe gallery. Background Art

[0002] Pipe corridors are important municipal infrastructure buried underground for storing various pipelines. There have been many fires and damages inside pipe corridors at home and abroad, causing serious consequences such as collapse of upper roads. Therefore, research on fire resistance of pipe corridors is very important. There are many experimental studies on fire resistance of concrete structure pipe corridors in China, but there are few studies on fire resistance of corrugated steel structure integrated pipe corridors. At present, the fire resistance research of concrete pipe corridors is mostly carried out by applying point loads and heating the inside of the corridor, because the corrugated plate is thin and cannot withstand point loads, and the steel is sensitive to temperature. It is not easy to control the temperature of the internal direct heating, and it is impossible to achieve uniform heating.

[0003] The bearing capacity of a steel structure pipe gallery is closely related to its own strength and the physical properties of the surrounding fill. Therefore, when studying the fire resistance of a steel structure pipe gallery, the influence of the structural backfill must be considered. In the event of a fire, the pipe gallery will be exposed to fire, and the temperature will reduce the bearing capacity of the steel. However, this temperature will gradually spread to the surrounding backfill, and the physical properties of the backfill will change at different temperatures. This change may affect the overall bearing capacity of the pipe gallery. Of course, the impact will vary depending on the backfill material. In addition, the actual buried depth of the pipe gallery will also have different effects on the overall bearing capacity of the pipe gallery.

[0004] According to relevant literature, when a fire occurs inside the corridor, as the smoke flows vertically and longitudinally, the temperature distribution inside the corridor will be different, and the temperature of the upper part will be higher than that of the lower part. Therefore, when conducting parameter research, the parts with higher local temperatures and greater stresses can be studied. The lower part of the corridor has a concrete base, which is relatively safe, while the top and upper structures of the corridor will collapse after being exposed to fire. Therefore, the fire safety of the corridor can be tested on only one side of the top and upper structures of the corridor. Therefore, how to provide a fire resistance test structure for a steel corridor that is simple in structure, easy to use, and safe and reliable in testing requires further consideration. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a fire resistance test structure for a steel pipe gallery with a simple structure, easy use, and safe and reliable testing.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A fire resistance test structure for a steel pipe gallery, comprising a heating furnace body, a furnace chamber recessed on the top of the heating furnace body, a heating device arranged in the furnace chamber, a loading test box communicating up and down arranged on the top of the heating furnace body, the loading test box being placed on and fixed on the top of the heating furnace body, an arched pipe gallery top component being arranged in the loading test box, two ends of the pipe gallery top component being supported and fixed on both sides of the top of the heating furnace body, the pipe gallery top component being located above the heating device, and both side edges of the pipe gallery top component respectively abutting against the inner walls of the loading test box, and a fill layer being covered in the loading test box and above the pipe gallery top component.

[0007] In the present invention, the inner wall of the loading test box is clamped on both side edges of the tunnel top component, so that backfilling operation can be carried out on the top of the tunnel top component. The two end supports of the tunnel top component are fixed on both sides of the top of the heating furnace body to simulate the lower part of the tunnel to support it. Then, a heating device is used to simulate the high temperature of a fire to heat the tunnel top component in a curve below the tunnel top component. The test ends when the tunnel top component is observed to collapse.

[0008] As an optimization, the loading test box includes two panels that are opposite to each other and arranged vertically. The two panels are arranged parallel to each other, and the inner sides of the two panels abut against the side edges of the two sides of the pipe gallery top component. Side panels are respectively arranged between the two panels and on the outer sides of the two ends of the pipe gallery top component. The side panels are fixedly connected to the two panels so that the side panels can abut against or move away from the end of the pipe gallery top component on its side. The test of the pipe gallery top component is divided into top plate test and gallery body test. The top plate is only the top plate of the top of the pipe gallery, which mainly tests its own structural effect and the boundary effect of the fill layer. Therefore, the side panels are arranged to abut against the two ends of the pipe gallery top component. The gallery body is the upper half of the entire pipe gallery, which mainly tests the structural effect of the boundary soil of the gallery body. Therefore, the side panels need to be separated from the ends of the pipe gallery top component so that there is backfill soil on the sides.

[0009] As an optimization, a pressure plate is horizontally arranged inside the loading test box and above the fill layer, the projection of the pressure plate in the vertical direction coincides with the projection of the top box opening of the loading test box in the vertical direction, a load loader is arranged above the pressure plate, a telescopic column that can be telescoped in the vertical direction extends from the bottom of the load loader, the end of the telescopic column is fixedly connected to the top surface of the pressure plate, and a bracket for supporting the load loader is also fixedly connected to the load loader. By extending and retracting the telescopic column, the pressure plate is controlled to apply load to the fill layer, so as to facilitate the simulation of different depths of pipe gallery landfill.

[0010] As an optimization, a plurality of support rods are arranged in the loading test box and below the pipe gallery top component. The support rods are extended in the lateral direction of the pipe gallery top component, and both ends of the support rods are respectively fixedly connected to the loading test box, and the fire resistance temperature of the support rods is greater than the fire resistance temperature of the pipe gallery top component. Since the heating device is below the pipe gallery top component, when the pipe gallery top component collapses, it is easy to cause damage to the heating device below, so a support rod with a higher temperature resistance is arranged to support the pipe gallery top component when it collapses downward.

[0011] As an optimization, a plurality of temperature detection sensors for extending into the fill layer are evenly installed on the loading test box and located above the pipe gallery top component in the vertical direction, so as to facilitate the measurement of soil temperature gradient.

[0012] As an optimization, connecting supports are respectively provided at the top of the heating furnace body and at the positions corresponding to the two ends of the pipe gallery top component. The connecting supports include a connecting bottom plate fixedly connected to the top of the heating furnace body, and an oblique support plate is obliquely provided on the connecting bottom plate. The inclination angle of the oblique support plate is consistent with the inclination angle of the end face of the pipe gallery top component. The plate surface of the oblique support plate abuts against the end face of the pipe gallery top component and is fixedly connected thereto. The bottom edge of the oblique support plate is fixedly connected to the connecting bottom plate, and supporting ribs are respectively fixed to the oblique support plate and the connecting bottom plate for supporting the oblique support plate. Since the structure of the pipe gallery top component is arched, the end faces of the two ends are not horizontal but an inclined surface due to the connection with other components. Therefore, when installing and fixing the pipe gallery top component, the connecting supports are provided so that the plate surface of the oblique support plate can better abut and fit on the end faces of the two ends of the pipe gallery top component to support and fix it.

[0013] Compared with the prior art, the present invention has a simple structure and is easy to use. It can realize fire resistance testing of the pipe gallery roof components under loads of different sizes and positions. The test results are accurate and the test process is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the installation structure of the pipe gallery top component in Example 1 of the present invention; Figure 3 This is a schematic diagram of the installation structure of the pipe gallery top component in Example 2 of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0016] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] Example 1 like Figure 1 and Figure 2As shown, the fire resistance test structure of the steel pipe gallery in this specific embodiment includes a heating furnace body 1, a furnace chamber is recessed on the top of the heating furnace body 1, a heating device is arranged in the furnace chamber, a loading test box which is communicated with each other from top to bottom is arranged on the top of the heating furnace body 1, the loading test box is placed on and fixed on the top of the heating furnace body 1, an arched pipe gallery top component 3 is arranged in the loading test box, the two ends of the pipe gallery top component 3 are supported and fixed on both sides of the top of the heating furnace body 1, the pipe gallery top component 3 is located above the heating device, and the side edges of the pipe gallery top component 3 are respectively abutted against the inner walls of the loading test box, and the loading test box and above the pipe gallery top component 3 are covered with a fill layer 4.

[0018] In this specific embodiment, the loading test box includes two panels 5 that are opposite to each other and vertically arranged front and back, the two panels 5 are arranged parallel to each other, the inner sides of the two panels 5 abut against the side edges of the two sides of the corridor top component 3, and side panels 6 are respectively arranged between the two panels 5 and on the outer sides of the two ends of the corridor top component 3. In this embodiment, the corridor top component is the corridor top plate, and the side panels 6 are fixedly connected to the two panels 5 so that the side panels 6 can abut against the end of the corridor top plate on its side.

[0019] In this specific embodiment, a pressure plate is horizontally arranged in the loading test box and above the fill layer 4, and the projection of the pressure plate along the vertical direction coincides with the projection of the top box opening of the loading test box along the vertical direction. A load loader 7 is arranged above the pressure plate, and a telescopic column that can be telescoped in the vertical direction extends from the bottom of the load loader 7. The end of the telescopic column is fixedly connected to the top surface of the pressure plate, and a bracket 8 for supporting the load loader 7 is also fixedly connected to the load loader 7.

[0020] In this specific embodiment, a plurality of support rods 9 are arranged in the loading test box and below the tunnel top component 3. The support rods 9 are extended along the lateral direction of the tunnel top component 3. Both ends of the support rods 9 are respectively fixedly connected to the loading test box. The fire resistance temperature of the support rods 9 is greater than the fire resistance temperature of the tunnel top component 3.

[0021] In this specific embodiment, a plurality of temperature detection sensors 10 for extending into the fill layer 4 are evenly installed at intervals in the vertical direction on the loading test box and above the tunnel roof member 3 .

[0022] In this specific embodiment, connecting supports 2 are respectively provided on the top of the heating furnace body and at positions corresponding to the two ends of the pipe gallery top component 3. The connecting supports 2 include a connecting bottom plate fixedly connected to the top of the heating furnace body 1, and an oblique support plate is obliquely provided on the connecting bottom plate. The inclination angle of the oblique support plate is consistent with the inclination angle of the end face of the pipe gallery top component 3. The plate surface of the oblique support plate abuts against the end face of the pipe gallery top component 3 and is fixedly connected thereto. The bottom edge of the oblique support plate is fixedly connected to the connecting bottom plate, and supporting ribs are provided between the oblique support plate and the connecting bottom plate, which are respectively fixed to the oblique support plate and the connecting bottom plate for supporting the oblique support plate.

[0023] Example 2 As another embodiment of the present invention, Figure 3 As shown, in this specific embodiment, the pipe gallery top component 3 is a gallery body, both ends of which are directly fixed to the top sides of the heating furnace body, and the side plate 6 is spaced apart from the end of the gallery body on its side.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described with reference to the preferred embodiments of the present invention, it should be understood by those skilled in the art that various changes may be made in form and details without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A fire resistance test structure for a steel pipe gallery, characterized in that: It includes a heating furnace body, a furnace chamber is recessed on the top of the heating furnace body, a heating device is arranged in the furnace chamber, a loading test box which is communicated with each other from top to bottom is arranged on the top of the heating furnace body, the loading test box is placed on and fixed on the top of the heating furnace body, an arched pipe gallery top component is arranged in the loading test box, both ends of the pipe gallery top component are supported and fixed on both sides of the top of the heating furnace body, the pipe gallery top component is located above the heating device, and both side edges of the pipe gallery top component are respectively abutted against the inner walls of the loading test box, and a fill layer is covered in the loading test box and above the pipe gallery top component.

2. The fire resistance test structure of the steel pipe gallery according to claim 1 is characterized in that: The loading test box includes two panels that are opposite to each other and arranged vertically in the front and rear directions. The two panels are arranged parallel to each other. The inner sides of the two panels abut against the side edges of the two sides of the pipe gallery top component. Side panels are respectively arranged between the two panels and on the outer sides of the two ends of the pipe gallery top component. The side panels are fixedly connected to the two panels so that the side panels can abut against or move away from the end of the pipe gallery top component on their side.

3. The fire resistance test structure of the steel pipe gallery according to claim 1 is characterized in that: A pressure plate is horizontally arranged in the loading test box and above the fill layer. The projection of the pressure plate in the vertical direction coincides with the projection of the top box opening of the loading test box in the vertical direction. A load loader is arranged above the pressure plate. A telescopic column that can be telescoped in the vertical direction extends from the bottom of the load loader. The end of the telescopic column is fixedly connected to the top surface of the pressure plate. A bracket for supporting the load loader is also fixedly connected to the load loader.

4. The fire resistance test structure of the steel pipe gallery according to claim 1 is characterized in that: A plurality of support rods are arranged in the loading test box and below the pipe gallery top component. The support rods are extended along the lateral direction of the pipe gallery top component. Both ends of the support rods are respectively fixedly connected to the loading test box. The fire resistance temperature of the support rods is greater than the fire resistance temperature of the pipe gallery top component.

5. The fire resistance test structure of the steel pipe gallery according to claim 1 is characterized in that: A plurality of temperature detection sensors for extending into the soil filling layer are evenly installed at intervals in the vertical direction on the loading test box and located above the pipe gallery top component.

6. The fire resistance test structure of the steel pipe gallery according to claim 1 is characterized in that: Connecting supports are respectively arranged at the top of the heating furnace body and at positions corresponding to the two ends of the pipe gallery top component. The connecting supports include a connecting bottom plate fixedly connected to the top of the heating furnace body, and an oblique support plate is obliquely arranged on the connecting bottom plate. The inclination angle of the oblique support plate is consistent with the inclination angle of the end face of the pipe gallery top component. The plate surface of the oblique support plate abuts against the end face of the pipe gallery top component and is fixedly connected thereto. The bottom edge of the oblique support plate is fixedly connected to the connecting bottom plate, and supporting ribs are arranged between the oblique support plate and the connecting bottom plate, which are respectively fixed to the oblique support plate and the connecting bottom plate for supporting the oblique support plate.

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