CN-122014281-A - Temperature-sensitive intelligent response tunnel lining structure, and manufacturing mold and manufacturing method thereof

CN122014281ACN 122014281 ACN122014281 ACN 122014281ACN-122014281-A

Abstract

The invention relates to a temperature-sensitive intelligent response tunnel lining structure and a manufacturing mould and a manufacturing method thereof, wherein the lining structure comprises an outer layer, a middle layer and an inner protective layer, the three layers of structures are glued through the temperature-sensitive structure to form an arc lining unit, and the outer layer and the inner protective layer are FPR layers with continuous fiber reinforced networks distributed inside; the middle layer is a UHPC layer with a toughness reinforcing filler, and the edges of the outer layer and the inner protective layer are embedded with temperature sensing pieces connected with a fiber reinforced network. The manufacturing mould comprises a main arc-shaped mould frame and two separation templates, wherein the separation templates are divided into three pouring mould cavities after being inserted, fiber reinforced networks with temperature sensing parts are placed in the pouring mould cavities of the outer layer and the inner protective layer, the pouring mould cavities are respectively molded in a pouring mode, and gaps formed by the separation templates are extracted to be filled with temperature-sensitive structural adhesive so that the three-layer structure is bonded and fixed, and a finished lining unit is formed after demoulding. The invention has the temperature active corresponding function, is not easy to burst at high temperature, has strong structural stability and is easy to produce and process.

Inventors

LI HAO
WEN XIAODONG
FENG LEI

Assignees

宁波工程学院

Dates

Publication Date: 20260512
Application Date: 20260204

Claims (10)

1. A temperature-sensitive intelligent response tunnel lining structure is characterized by comprising an outer layer (1), a middle layer (2) and an inner protective layer (3), wherein the three-layer structure is bonded through temperature-sensitive structural adhesive (4) to form an integral arc lining unit with strong bonding interfaces, the outer layer and the inner protective layer are all FPR fiber reinforced composite material layers, a matrix of the fiber reinforced composite material layers adopts shape memory epoxy resin, continuous fiber reinforced networks (6) are distributed in the matrix, the middle layer is a UHPC layer, namely ultra-high performance concrete is used as a matrix, toughness reinforcing fillers are uniformly doped in the matrix to form a three-dimensional reinforcing system, temperature sensing pieces (5) are buried at edges of the outer layer and the inner protective layer, the temperature sensing pieces are connected with the corresponding fiber reinforced networks to form a temperature sensing system, and the fiber reinforced networks and the toughness reinforcing fillers form a mechanical bearing and thermal stress resistant cooperative stress system based on the integral bonding of the three-layer structure.
2. The temperature-sensitive intelligent response tunnel lining structure according to claim 1, wherein the fiber reinforced network (6) in the outer layer (1) and the inner protective layer (3) is formed by mixed braiding of carbon fibers and glass fibers, and the carbon fibers account for 15% -25% of the total mass of the fibers.
3. The temperature-sensitive intelligent response tunnel lining structure according to claim 1, wherein the toughness reinforcing filler of the middle layer (2) is a composite system of steel fibers and graphene, the length of the steel fibers is 12-18 mm, the volume ratio is 3-5%, and the doping amount of the graphene is 0.5-1.0% of the mass of the cementing material in the process of manufacturing the middle layer.
4. The temperature-sensitive intelligent response tunnel lining structure according to claim 1, wherein the temperature sensing piece (5) is a nichrome wire, one side of the nichrome wire is embedded into the edge of the fiber reinforced composite material layer and is in close contact with an internal fiber reinforced network, and the other side of the nichrome wire extends out of the lining unit, and the extending length of the nichrome wire is 8-12 mm.
5. The temperature-sensitive intelligent response tunnel lining structure according to claim 1, wherein the thickness of each of the outer layer (1) and the inner protective layer (3) is 4-8 mm, the thickness of the middle layer (2) is 150-200 mm, the radian of a lining unit is 90-120 degrees, and the width of a single lining unit is 1200-1500 mm.
6. The temperature-sensitive intelligent response tunnel lining structure according to claim 1, wherein concave-convex textures with texture depth of 2-3 mm are arranged on the inner surface and the outer surface of the middle layer (2).
7. A manufacturing die for manufacturing the temperature-sensitive intelligent response tunnel lining structure is characterized by comprising a main arc-shaped die frame (8) formed by splicing two arc-shaped half frames and two arc-shaped separation die plates (10), wherein arc-shaped pouring cavities with open top surfaces are arranged in the main arc-shaped die frame, namely arc-shaped half pouring cavities are respectively formed in the two arc-shaped half frames, the spliced parts between the two arc-shaped half frames are locked and fixed through locking pieces (9), two ends of the separation die plates are in sliding insertion fit with two ends of the arc-shaped pouring cavities in the main arc-shaped die frame, the two separation die plates after insertion fit separate the arc-shaped pouring cavities into three pouring die cavities corresponding to an outer layer (1), a middle layer (2) and an inner protective layer (3), and after the three pouring die cavities are poured and molded, the outer layer, the middle layer and the inner protective layer are extracted to form a glue cavity filled with temperature-sensitive structural glue (4).
8. The manufacturing die of the temperature-sensitive intelligent response tunnel lining structure according to claim 7 is characterized in that positioning grooves (802) corresponding to temperature sensing pieces (5) at two ends of a fiber reinforced network (6) are formed in two ends of a casting die cavity corresponding to an outer layer (1) and an inner protective layer (3) in a main arc-shaped die frame (8), and positioning grooves corresponding to the temperature sensing pieces at the bottom end of the fiber reinforced network are formed in the bottom of a joint of two arc-shaped half frames of the main die frame.
9. The manufacturing die of the temperature-sensitive intelligent response tunnel lining structure according to claim 7 is characterized in that vertical ribs (1002) which are uniformly distributed at intervals along the arc direction are arranged on one side surface of a casting die cavity of the separation template (10) facing the middle layer (2).
10. A method for manufacturing a mold for manufacturing a temperature-sensitive intelligent response tunnel lining structure according to claim 8, comprising the steps of: a. cleaning an arc pouring cavity and a separation template (10) of the main arc-shaped template frame (8), uniformly brushing a release agent on the inner wall of the arc pouring cavity and the separation template, brushing the release agent for 0.1-0.2 mm, and standing for 15-20 minutes until the release agent is dried; b. Splicing the two arc half frames to form the main arc-shaped mold frame, inserting the separation mold plates into the bottom along the two ends in the main arc-shaped mold frame, and separating the arc-shaped casting cavities to form three casting mold cavities corresponding to the outer layer (1), the middle layer (2) and the inner protective layer (3); c. the fiber reinforced network (6) and the temperature sensing piece (5) are fixedly connected in advance to form a whole, and are respectively placed into the casting film cavity of the corresponding outer layer and the inner protective layer in the main arc-shaped mold frame, and the temperature sensing piece and the positioning groove corresponding to the inner peripheral surface of the casting film cavity form plug-in positioning fit, so that the whole fiber reinforced network is positioned; d. Pouring a shape memory epoxy resin matrix into a pouring die cavity of the main body arc-shaped die frame corresponding to the outer layer and the inner protective layer, wherein the viscosity is controlled to be 600-900 mPa seed s to the required layer thickness; e. Preparing a UHPC mixture doped with a toughness reinforcing filler, pouring the mixture into a casting die cavity of a corresponding middle layer in a main body arc-shaped die frame, and compacting the mixture for 2-3 minutes at a high-frequency vibrating frequency of 30000-40000 r/min; f. D, after the outer layer, the middle layer and the inner protective layer in the step e are all molded stably, the separation template is pulled out from the top of the main body arc-shaped template frame, a glue cavity is formed among the outer layer, the middle layer and the inner protective layer, and temperature-sensitive structural glue (4) is filled in the glue cavity until the three layers are bonded and fixed; g. And after curing, separating and demolding the two arc half frames of the main arc-shaped mold frame to obtain the finished lining unit.

Description

Temperature-sensitive intelligent response tunnel lining structure, and manufacturing mold and manufacturing method thereof Technical Field The invention relates to the technical field of tunnel engineering, belongs to the technical field of tunnel supporting structures in civil engineering, and particularly relates to a temperature-sensitive intelligent response tunnel lining structure capable of realizing fire prevention and explosion prevention through temperature sensing and stress release functions, and a manufacturing die and a manufacturing method thereof. Background In underground projects such as highway, railway tunnel and underground utility tunnel, tunnel lining is used as a core bearing and protecting structure, and is faced with the serious challenges of extreme high temperature environments such as fire. When a fire disaster occurs, the temperature in the tunnel can be raised to 300-600 ℃ in a short time, and the traditional tunnel lining structure is easy to have two fatal problems, namely, firstly, the moisture in the concrete is quickly vaporized to generate high pressure to cause explosive peeling, so that the integrity of the lining structure is damaged, secondly, the strength of the common concrete is rapidly attenuated along with the temperature rise, the strength is reduced by 50% at 200 ℃, the structure is further unstable and collapsed, and the personnel evacuation and rescue safety is seriously threatened. The tunnel fireproof measures adopted in the current engineering mainly comprise spraying fireproof paint, arranging a steel structure fireproof plate, adopting common FRP-UHPC composite lining and the like. The spraying fireproof coating is simple and convenient to construct, but is easy to age and fall off after long-term use, the fireproof durability is insufficient, the steel structure fireproof plate needs to be additionally installed and fixed, the dead weight and construction cost of the structure are increased, the cooperativity of the steel structure fireproof plate and a lining body is poor, the common FRP-UHPC composite lining has high strength and high durability, but lacks a temperature response mechanism, the FRP-UHPC interface is easy to peel and lose efficacy at high temperature, the thermal stress in the UHPC cannot be relieved, and the bursting risk still exists. Some researches try to improve the high temperature resistance by optimizing the formula of the FRP matrix, but an active response mechanism is not formed, when the fiber reinforced toughness is doped in UHPC, if the doping amount is insufficient, the anti-cracking effect is limited, and the construction fluidity and the interface bonding performance are influenced due to the excessively high doping amount. Therefore, the development of the tunnel lining structure which can actively sense temperature change, intelligently release thermal stress and cooperatively promote structural mechanical properties becomes a key technical requirement for solving the potential safety hazard of tunnel fire. Disclosure of Invention In order to overcome the defects, the invention aims to provide a temperature-sensitive intelligent response tunnel lining structure, a manufacturing mould and a manufacturing method thereof for solving the technical problems that the conventional tunnel lining structure does not have a temperature active response function, is easy to burst at high temperature and has poor structural stability. The aim is achieved by the following technical scheme. A temperature-sensitive intelligent response tunnel lining structure is structurally characterized by comprising an outer layer, a middle layer and an inner protective layer, wherein the three-layer structure is formed into an integral arc lining unit with strong bonding interfaces through temperature-sensitive structure adhesive, the outer layer and the inner protective layer are all FPR fiber reinforced composite material layers, a matrix of the fiber reinforced composite material layers adopts shape memory epoxy resin, continuous fiber reinforced networks are distributed inside the matrix, the middle layer is a UHPC layer, namely ultra-high performance concrete is used as a matrix, toughness reinforcing fillers are uniformly doped inside the matrix to form a three-dimensional reinforcing system, temperature sensing pieces are buried at edges of the outer layer and the inner protective layer, the temperature sensing pieces are connected with the corresponding fiber reinforced networks to form a temperature sensing system, and the fiber reinforced networks and the toughness reinforcing fillers form a mechanical bearing and thermal stress resistant cooperative stress system based on the integral bonding of the three-layer structure. Through the structure, the shape memory epoxy resin matrix of the outer layer and the inner protective layer is utilized, the energy is released when the temperature reaches a critical value, the thermal stress accumul