CN-121025858-B - Tunnel substrate concrete heat dissipation system and design method of heat dissipation fins

CN121025858BCN 121025858 BCN121025858 BCN 121025858BCN-121025858-B

Abstract

The application relates to a tunnel base concrete heat dissipation system and a design method of heat dissipation fins, relates to the technical field of tunnel pouring heat dissipation, and aims to solve the problem that an existing heat dissipation structure cannot meet heat dissipation requirements after tunnel base concrete pouring to a certain extent. The tunnel substrate concrete heat dissipation system is used for dissipating heat after pouring tunnel substrate concrete and comprises a supply device and a plurality of heat dissipation devices, wherein the heat dissipation devices extend along the length direction of a tunnel substrate and are arranged at intervals along the width direction of the tunnel substrate, the heat dissipation devices comprise a main pipeline and a plurality of heat dissipation fins, one end of the main pipeline is communicated with the output end of the supply device, the other end of the main pipeline is communicated with the backflow end of the supply device, the heat dissipation fins are arranged at intervals along the axial direction of the main pipeline, and the diameters of the heat dissipation fins arranged on the main pipeline gradually increase from one end of the main pipeline to the other end of the main pipeline and gradually decrease.

Inventors

SUN YI
ZHU ZHEN
YANG JINWEN
LU YONGLONG
LIU BING
JIN ZHE
ZHANG WEIMING
DU MINGQING
TIAN XIAOLU
CHEN LIMIN

Assignees

中铁十六局集团有限公司
中铁十六局集团第一工程有限公司
中铁十九局集团有限公司

Dates

Publication Date: 20260512
Application Date: 20250908

Claims (6)

1. The design method of the tunnel base concrete radiating fin is used for designing the radiating fin in a tunnel base concrete radiating system and is characterized in that the tunnel base concrete radiating system is used for radiating heat after pouring tunnel base concrete and comprises a supply device and a plurality of radiating devices; The heat dissipation devices extend along the length direction of the tunnel substrate, and are arranged at intervals along the width direction of the tunnel substrate; The plurality of radiating devices comprise a main pipeline and a plurality of radiating fins, one end of the main pipeline is communicated with the output end of the supply device, and the other end of the main pipeline is communicated with the reflux end of the supply device; the plurality of radiating fins are arranged at intervals along the axial direction of the main pipeline, and the diameters of the radiating fins arranged on the main pipeline gradually increase from one end of the main pipeline to the other end of the main pipeline and then gradually decrease; The radiating fins on the same axial position of the main pipeline comprise a plurality of radiating bridge parts, the radiating bridge parts are distributed along the circumferential direction of the main pipeline, and the liquid inlet end and the liquid outlet end of the radiating bridge parts are communicated with the main pipeline; the design method of the tunnel base concrete radiating fin comprises the following steps: step one, determining the required time t for concrete heat dissipation and the ambient temperature; step two, slicing and dividing the heating condition of the concrete along the layout direction of the main pipeline, wherein the minimum unit L of slicing is more than or equal to 3 times of the maximum grain diameter D of the poured concrete coarse aggregate; Step three, determining the concrete hydration heat peak temperature T1 at any point in the interior, wherein the apparent temperature T2 of the concrete and the temperature T3 of the cooling liquid in the pipe are at the same time; step four, calculating released heat Q, total heat transfer coefficient U and logarithmic average temperature difference Lmtd of the concrete unit, wherein: ; ; ; m a the mass of the high-temperature solid a is kg; the specific heat capacity of the concrete unit at constant pressure is J/(kg and seed); The convection heat transfer coefficient of the fluid in the tube is W/(m 2 and K); delta pipe wall thickness, unit is m; the heat conductivity coefficient of the pipe is W/(mK); The unit of the convection heat transfer coefficient of the solid outside the tube is W/(m 2 and K), and eta is the fin efficiency; step five, calculating the area of the fins required by the concrete unit: ; Wherein the method comprises the steps of For the area of a single said heat dissipating fin, Is the external surface area of the main pipeline.
2. The method for designing a tunnel base concrete radiating fin according to claim 1, wherein the radiating fin comprises a sheet body part, a sleeve joint part and a locking piece; The utility model discloses a device for fixing a pipeline, including sheet body portion, locking piece, casing joint portion, locking piece, main pipe, locking piece, casing joint portion, locking piece, sheet body portion coaxial arrangement, just the internal diameter of casing joint portion with main pipe looks adaptation, just the casing joint portion can be in slip on the main pipe, locking piece with casing joint portion swing joint, locking piece follows the radial extension of casing joint portion, just locking piece's one end can pass casing joint portion to be close or keep away from with the direction of the outer wall of main pipe moves.
3. The method for designing tunnel foundation concrete radiating fins according to claim 2, wherein a plurality of locking members are provided and are uniformly distributed along the circumference of the socket.
4. The method for designing tunnel base concrete heat dissipating fins according to claim 2, wherein the outer wall of the main pipe is formed with a first threaded portion, the first threaded portion covers from one end to the other end of the main pipe, the inner annular wall of the sheet portion is formed with a second threaded portion, and the sheet portion is in threaded connection with the main pipe.
5. The method for designing the tunnel base concrete radiating fin according to claim 1, wherein the radiating fin is of a hollow structure, a containing cavity is formed in the radiating fin, a communication port is formed in the main pipeline at a position corresponding to the radiating fin, and the containing cavity is communicated with the main pipeline through the communication port.
6. The method for designing tunnel base concrete radiating fins according to claim 2, wherein the sheet body part has a disc-shaped structure or a plurality of sheet-shaped structures uniformly distributed along the circumferential direction of the main pipe.

Description

Tunnel substrate concrete heat dissipation system and design method of heat dissipation fins Technical Field The application relates to the technical field of tunnel pouring heat dissipation, in particular to a tunnel base concrete heat dissipation system and a design method of a heat dissipation fin. Background Along with the rapid development of the modern tunnel engineering technology, the tunnel structure design increasingly tends to develop in the large-section and long-span directions. The tunnel base concrete is used as a key structural layer for bearing upper load, and the construction quality directly influences the safety and durability of the whole tunnel. The inverted arch secondary lining filling layer structure is commonly adopted in the current construction, the single casting volume can reach more than 100 cubic meters, the length of the longitudinal casting unit is expanded to 12 meters, and the continuous lengthening trend is presented. In the concrete pouring process, a large amount of heat is generated by cement hydration reaction, and the heat dissipation area and the volume ratio of the large-volume concrete are relatively small, so that the temperature stress cracks are easily caused by internal heat accumulation. The traditional cooling method mainly relies on arranging a serpentine cooling pipeline system, and part of heat is carried out by circulating cooling water. However, the arrangement mode has the inherent defects of limited contact area between the pipeline and the concrete, low heat exchange efficiency and the like, and particularly, effective cooling of a high-temperature area of the concrete core and a heat concentration part of the special-shaped structure is difficult to realize. When the existing cooling system is used for coping with ultra-long and ultra-large-volume concrete pouring, the contradiction between the cooling capacity and engineering requirements is increasingly prominent. Therefore, there is an urgent need to provide a heat dissipating system and a design method of a heat dissipating fin to solve the above problems to some extent. Disclosure of Invention The application aims to provide a tunnel base concrete heat dissipation system and a design method of heat dissipation fins, so as to solve the problem that the existing heat dissipation structure cannot meet the heat dissipation requirement after pouring tunnel base concrete to a certain extent. The tunnel substrate concrete heat dissipation system comprises a supply device and a plurality of heat dissipation devices, wherein the heat dissipation devices extend along the length direction of a tunnel substrate and are arranged at intervals along the width direction of the tunnel substrate, the heat dissipation devices comprise a main pipeline and a plurality of heat dissipation fins, one end of the main pipeline is communicated with the output end of the supply device, the other end of the main pipeline is communicated with the backflow end of the supply device, the heat dissipation fins are arranged at intervals along the axial direction of the main pipeline, and the diameters of the heat dissipation fins arranged on the main pipeline are gradually increased from one end of the main pipeline to the other end of the main pipeline and then gradually decreased. The radiating fin comprises a sheet body part, a sleeving part and a locking piece, wherein the sleeving part and the sheet body part are coaxially arranged, the inner diameter of the sleeving part is matched with that of the main pipeline, the sleeving part can slide on the main pipeline, the locking piece is movably connected with the sleeving part, the locking piece extends along the radial direction of the sleeving part, and one end of the locking piece can move in the direction approaching to or far from the outer wall of the main pipeline through the sleeving part. Specifically, the locking pieces are a plurality of, and a plurality of locking pieces are uniformly distributed along the circumference of the sleeving part. Specifically, the outer wall of the main pipe is provided with a first thread part, the first thread part covers to the other end along one end of the main pipe, the inner annular wall surface of the lamellar body part is provided with a second thread part, and the lamellar body part is in threaded connection with the main pipe. The heat dissipation fin is of a hollow structure, an accommodating cavity is formed in the heat dissipation fin, a communication port is formed in the position, corresponding to the heat dissipation fin, of the main pipeline, and the accommodating cavity is communicated with the main pipeline through the communication port. Specifically, the radiating fins on the same axial position of the main pipeline comprise a plurality of radiating bridge parts, the radiating bridge parts are distributed along the circumferential direction of the main pipeline, and the liquid inlet end and the liquid outlet end o