CN208517761U - A kind of straight cutting oblique cutting alternative expression heat pipe road structure - Google Patents

Abstract

The utility model relates to a kind of straight cutting oblique cutting alternative expression heat pipe road structures, regulate and control applied to Permafrost Area highway, particularly wide cut roadbed ground temperature, which includes road foundation (3), the heat pipe being located on roadbed (3) two sides road shoulder and be located at roadbed (3) inside, the thermal insulation thermal insulation board (5) that horizontal direction is laid with；Heat pipe on ipsilateral road shoulder by angle-inserting type heat pipe (1) and direct insertion heat pipe (2) alternately, be uniformly distributed and formed.Heat pipe straight cutting-oblique cutting is arranged alternately the heat under effectively discharge roadbed road shoulder with roadbed central area in the utility model, and cooperate the cold energy use rate of roadbed inside holding thermal insulation board enhancing roadbed, pass through diabatic process in regulation subgrade, thus the accumulation of cooling capacity during targetedly increasing roadbed in winter achievees the purpose that Temperature Field, effective prevention and control roadbed generate secondary disease in whole reduction roadbed.The utility model can effectively solve permafrost region highway and build problem, and road structure is simple, convenient for being widely applied and constructing.

Description

A kind of straight cutting oblique cutting alternative expression heat pipe road structure

Technical field

The utility model relates in Permafrost Area highway, expressway construction, frozen earth roadbed ground temperature control technique is led Domain more particularly to a kind of straight cutting oblique cutting alternative expression heat pipe road structure.

Background technique

Frozen soil is a kind of temperature lower than 0 DEG C and the Tu Yan containing ice, the mechanical strength of frozen soil can with the variation of temperature and Huge change occurs: temperature is lower, and its intensity is bigger, when temperature is lower than -1.5 DEG C, instantaneous compression strength and general rock phase When；And temperature is when being higher than -0.5 DEG C to 0 DEG C, compression strength is equivalent to general soil block, even basic loses.

By using protection ever-frozen ground engineering measure, be solve Frozen Soil Engineering Problems, maintain frozen soil engineering stability, The effective way of the fragile cold area's frozen soil ecological environment of protection.In the time of construction Qinghai-Tibet Railway, researcher is innovatively It proposes to be built using " active cooling " roadbed principle, the cold reserves for reducing ground heat absorption, increasing foundation soil body reach reduction Frozen earth roadbed temperature, the purpose for maintaining roadbed steady in a long-term.By system research, in terms of heat transfer, thermal convection, heat radiation three It proposes the engineering measures such as regulation measure, such as block-stone embankment, ventilation pipe foundation, heat pipe, sunshade, and is successfully applied to Qinghai-Tibet iron In road, Qinghai-Tibet Highway construction.

Wherein, heat pipe is the heat-conducting system of a kind of vapour, liquid two-phase convection circulation, it is the steel pipe of a sealing vacuum, inner Face is filled with the liquid and gaseous working medium (such as nitrogen, freon, propane, CO2) of highly volatile, and upper end is to be equipped with heat dissipation The radiating segment of piece, lower end are endotherm section.In application, the frozen soil that the endotherm section insertion of heat pipe is needed to cool down.When environment temperature is When the temperature of radiating segment is lower than underground endotherm section temperature, heat pipe, which is started to work, is in thermally conductive state, by the heat in foundation soil Amount constantly distributes and keeps the soil body cooling.

Currently, heat pipe is in the frozen earth roadbed engineer application of highway, it is mainly a certain single using direct insertion or angle-inserting type Set-up mode, although result of study shows the utilization of heat pipe and produces cooling effect in frozen earth roadbed really, in roadbed Cooling effect show stronger locality, and may cause the engineering diseases such as roadbed longitudinal cracking.

Fig. 1 show the roadbed longitudinal cracking situation that the direct insertion heat pipe roadbed in Qinghai-Tibet Highway clear water river section occurs, on road There is longitudinal crack on road surface near base tailo slope surface and tailo road shoulder.To the roadbed of heat pipe of equal straight cutting at the road shoulder of two sides Ground temperature numerical simulation, as a result as shown in Fig. 2, although 0 DEG C of thermoisopleth is risen compared to former natural field in roadbed, temperature Field only under the road shoulder of two sides region (area B with C) compares natural place and decreases, but at roadbed center (A) and two sides slope foot Still it is in soaking condition, finally will lead to and generate otherness deformation in roadbed cross section, and causes roadbed internal stress to concentrate, position The changing of the relative positions is moved, roadbed is induced and generates cracking.Straight cutting heat pipe roadbed only has targetedly cooling effect to the soil body under the road shoulder of two sides, but It is not obvious in the cooling effect that roadbed central area is shown.

This is because railway mainly passes through earthfill road embankment slope surface and absorbs heat, and heat is mainly concentrated in roadbed in terms of heat transfer Lateral area in embankment bottom surface is easy to radiate outward.But for highway, since the strong endothermic of black asphalt pavement is made With, and bituminous pavement has impermeable role, moisture evaporative heat loss will be prevented, so that the entirety of highway subgrade under the same conditions Heat absorption intensity is railway more than 3 times, and the hot-fluid in roadbed is concentrated mainly on embankment bottom center region, it is difficult to frozen soil around Heat dissipation.Particularly with wide cuts roadbeds such as width of subgrade many highways wider than common road, when about 1 times of width of subgrade increase When, the caloric receptivity of embankment bottom surface will increase about 0.6 times, and generate significant " heat build-up effect ", cause lower part ever-frozen ground with more Fast speed is degenerated.Therefore, building highway in Permafrost Area will be in face of Frozen soil problems more outstanding and build technology Problem.

It follows that heat pipe is individually set according to single mode for highway etc. has the highway of wide cut roadbed When setting, the cooling effect of locality is shown in roadbed, and generates more significant otherness deformation, and it is vertical to eventually lead to roadbed Generation to cracking.The utility model is proposed mainly for above-mentioned important Frozen Soil Engineering Problems.

Utility model content

The technical problem to be solved by the utility model is to provide one kind to be applied to Permafrost Area highway, especially wide cut The engineering measure of roadbed ground temperature regulation targetedly increases roadbed by diabatic process in roadbed under the conditions of regulation frozen soil environment Thus the accumulation of cooling capacity during in winter reaches Temperature Field, effective prevention and control roadbed in whole reduction roadbed and generates secondary disease Purpose.

To solve the above problems, a kind of straight cutting oblique cutting alternative expression heat pipe road structure described in the utility model, the roadbed Structure includes road foundation, the several heat pipes being located on the roadbed two sides road shoulder and is located inside roadbed, horizontal direction laying Thermal insulation thermal insulation board；Heat pipe on ipsilateral road shoulder by angle-inserting type heat pipe and direct insertion heat pipe alternating, be uniformly distributed and formed.

Preferably, original natural earth's surface 0.5 ~ 2 m of the thermal insulation thermal insulation board away from the roadbed.

Preferably, the thermal insulation thermal insulation board is XPS insulation board.

Preferably, heat pipe opposite on the road shoulder of the roadbed two sides is different types of heat pipe.

Preferably, the spacing on ipsilateral roadbed road shoulder between adjacent heat pipe is 1 ~ 5m.

Preferably, the oblique cutting part and roadbed top surface that the angle-inserting type heat pipe is embedded in roadbed are in 30 ° ~ 60 °.

Preferably, which further includes the slope surface temperature regulating and controlling mechanism along roadbed slope setting.

Utility model compared with the prior art, the utility model has the following advantages:

1, effectively meet the requirement of the express highway roadbed ground temperature regulation in Permafrost Area

Firstly, the Joint effect of heat pipe difference set-up mode, can pointedly be discharged roadbed central area and roadbed road shoulder Under heat, can not only eliminate that the roadbed central area heat as caused by " heat build-up effect " under the conditions of wide cut roadbed assembles shows As, and ground temperature variation can be eliminated in roadbed influenced by Slopes temperature difference, so that native in different zones in roadbed Body is in temperature-fall period.

Secondly, the setting of roadbed inside holding thermal insulation board, not only can effectively prevent external heat and travels further into lower part frozen soil Ground, and can effectively prevent cold energy in roadbed and distribute outward, it significantly improves roadbed and ability and utilization rate is held to cold energy.

In summary structure and effect, 0 DEG C of thermoisopleth lifting range can be expanded to entire roadbed range, and road in roadbed Ground temperature is declined compared to initial natural place everywhere under base, this will fundamentally solve permafrost region roadbed especially wide cut road Kip is all over the sedimentation and deformation problem shown.As it can be seen that under the conditions of the utility model can satisfy Permafrost Area highway, road The special technical requirement of whole, uniform, the smooth cooling of base.

, effectively prevent the generation of the secondary engineering disease of roadbed

Under the utility model road structure regulating and controlling effect, 0 DEG C of isopleth and different subzero temperature isopleth, Temperature Field in roadbed Distribution situation morphological character and subgrade stability significantly improve.

In terms of morphological character: (1) by the violent fluctuating of previous different subzero temperature ground temperature isopleth, changing into present gentle Change procedure；(2) by the corresponding two minimum ground temperature areas in road shoulder two sides under previous roadbed, present roadbed center one is changed into A minimum ground temperature area.

In terms of subgrade stability: since frozen soil strength is directly related with temperature, also just by the roadbed two sides of previous measure Intensity relative maximum, center are relatively weak, and stress field is complicated and changeable, change into that roadbed central area is relatively large, stress field phase To equilibrium.

Not only frozen soil foundation intensity in lower part is strengthened as a result, but also the modified difference opposite sex obtains greatly at roadbed different location Amplitude weakens, effectively maintenance subgrade stability, prevents the generation of the secondary engineering disease such as roadbed longitudinal cracking.

, effectively maintain roadbed long-time stability

The utility model road structure prevents and treats the generation of the engineering diseases such as crevice of roadbed, reduces extraneous precipitation and penetrates into roadbed Fissure channel, effectively prevent subgrade soil mechanical property to be influenced by water content and frozen-thaw process, to maintain roadbed long-term Stability.

Detailed description of the invention

Specific embodiment of the present utility model is described in further detail with reference to the accompanying drawing.

Fig. 1 is the direct insertion heat pipe roadbed quality schematic diagram in Qinghai-Tibet Highway clear water river section in the prior art.

Fig. 2 is direct insertion heat pipe structure roadbed temperature field numerical result figure on October 1st, 1 in the prior art.

Fig. 3 is schematic perspective view provided by the embodiment of the utility model.

Fig. 4 is the side view of Fig. 3.

Fig. 5 is roadbed temperature field on October 1st, 1 after the utility model structure provided by the embodiment of the utility model is implemented Numerical result figure.

In figure: 1-angle-inserting type heat pipe, 2-direct insertion heat pipes, 3-roadbeds, 4-slope surface temperature regulating and controlling mechanisms, 5-heat preservations Thermal insulation board.

Specific embodiment

With reference to Fig. 3 ~ 4, the utility model embodiment provides a kind of straight cutting oblique cutting alternative expression heat pipe road structure, specific Including road foundation 3, the several heat pipes being located on the 3 two sides road shoulder of roadbed and be located inside roadbed 3, horizontal direction be laid with Thermal insulation thermal insulation board 5.

Heat pipe on ipsilateral road shoulder by angle-inserting type heat pipe 1 and the alternating of direct insertion heat pipe 2, be uniformly distributed and formed.Ipsilateral roadbed 3 Spacing on road shoulder between adjacent heat pipe is 1 ~ 5m.Opposite heat pipe is preferably different types of heat pipe on 3 two sides road shoulder of roadbed.

It is understood that direct insertion heat pipe 2 is embedded in the straight cutting part in roadbed 3 perpendicular to 3 top surface of roadbed, and for Angle-inserting type heat pipe 1, angle is preferably 30 ° ~ 60 ° between 3 top surface of the oblique cutting part being embedded in roadbed 3 and roadbed.In reality In, temperature regulating and controlling effect section is controlled by adjusting embedded angle, the adjacent heat tube spacing of heat pipe.

Heat pipe is a kind of engineering measure of winter progress efficient heat transfer, can be by the environment in winter by the effect of heat pipe Cold energy is constantly conducted to underground, constantly reduces the frozen soils temperature of roadbed.The utility model proposes composite heat pipe arranged in a crossed manner Group can carry out overall cooling, uniform decrease in temperature to roadbed lower most region, utmostly maintain the whole steady of roadbed Roadbed longitudinal cracking that is fixed, preventing the distribution of Temperature Field unevenness from may cause.

Thermal insulation thermal insulation board 5 is located at the middle part inside roadbed 3, according to the common height of roadbed 3, makes thermal insulation thermal insulation board 5 away from roadbed 3 Natural 0.5 ~ 2 m of earth's surface of original also almost at 3 middle part of roadbed.The setting of thermal insulation thermal insulation board 5 can effectively prevent road black The heat absorption of color road surface and the downwards adverse effect of transmitting heat.While further enhancing hot pin cooling effect, to Temperature Field Symmetry, uniformity also function to fine facilitation.

It in practical applications can be using XPS insulation board as thermal insulation thermal insulation board 5.Wherein, XPS insulation board is also known as XPS sky Insulation board, i.e. extrusion moulding type polystyrene heat insulating board are adjusted, it is to add other supplementary materials by raw material of polystyrene resin With polymer, by heating mixing injecting catalyst simultaneously, then extrusion molding extrusion molding and the rigid foam plate that manufactures.It Scientific name be extrusion molding polystyrene polyfoam for heat insulation (abbreviation XPS), XPS have perfect closed honeycomb structure, this knot Structure has that extremely low water imbibition (hardly absorb water), low thermal conductivity coefficient, high pressure resistance, (normal use is almost for ageing resistance by XPS plate Without aging decomposition).

In addition, during actual frozen soil " active cooling " protection, it can be in the utility model straight cutting oblique cutting alternative expression On the basis of the heat transfer regulation of heat pipe road structure, it is aided with the thermal convection regulation of existing slope surface temperature regulating and controlling mechanism 4.The two Heat during Application of composite can further increase roadbed in winter distributes, to reach more uniform, effective roadbed drop Temp effect.

Wherein, slope surface temperature regulating and controlling mechanism 4 is set along 3 tailo slope surface of roadbed or two side slope upper berths, can be stopped and be kept away Exempt from solar radiation to the heat effect of slope surface.It can be heat transfer regulation, thermal convection regulation, heat radiation regulation measure, including It is not limited to insulation board, block stone layer slope protection, sunshading board etc..

Disclosed heat pipe road structure, the utility model embodiment further correspondingly provide a kind of construction based on the above embodiment Method specifically comprises the following steps:

(1) during roadbed filling, when roadbed filling to design height half position, by grading and pressure It is real, it all then is laid with one or more layers thermal insulation thermal insulation board, then completes subsequent roadbed construction process.

(2) it after completing roadbed whole build process, at the road shoulder position of roadbed, is completed according to default spacing by drilling The insertion of direct insertion heat pipe is completed fixed and embedded by backfill fine sand.

(3) center between direct insertion heat pipe is inserted into angle-inserting type heat pipe according to predetermined angle oblique drilling hole To heat pipe crooked place, completed finally by backfill fine sand fixed and embedded.

For the controlling performance for verifying the utility model straight cutting oblique cutting alternative expression heat pipe road structure, in conjunction with Qinghai-Tibet highway Experimental project field condition, provides following instance and to having carried out numerical value calculating to it, and with the controlling performance of prior art spy Property compares.

Example: on the express highway roadbed two sides road shoulder with a thickness of 3.0 m, by heat pipe according to angle-inserting type, direct insertion It is arranged alternately.On the road shoulder of the same side, the spacing of adjacent heat pipe is set as 1.5 m.It is away from former natural ground level in roadbed XPS insulation board is laid at 1.5 m.

Since frozen soil strength and its temperature changing process are closely related, temperature is lower, intensity is bigger, therefore, ever-frozen ground Area's roadbed ground temperature regulates and controls not requiring nothing more than the reduction of roadbed ground temperature, and requires the uniformity and planarization of roadbed Temperature Field.By Fig. 2 It can be seen that the utility model with advance outstanding with Fig. 5 Comparative result, can effectively solve frozen soil engineering problem.Specifically It shows in the following areas:

(1) existing roadbed temperature field situation is improved, meets the regulation of Permafrost Area highway temperature field and requires.Pass through Fig. 2, Fig. 5 comparison can see, after the utility model examples detailed above is implemented, roadbed the centre (- 5m depth of A area shown in Fig. 5 Position) ground temperature of the more previous measure of ground temperature further decreased, and the temperature of specially center is reduced to -1.3 DEG C by -1 DEG C.

(2) prominent to change original Temperature Field situation, so that subgrade stability is largely increased.By Fig. 2 it can be seen that original After having engineering measure implementation, central area (area Tu Zhong A) frozen soils temperature is relatively high within the scope of certain depth, and the region is Thus the main field of load of embankment load will lead to the larger and crevice of roadbed of roadbed central area sinking.Meanwhile 0 DEG C of isopleth Saddle is presented in Fig. 2 to rise and fall, leads to the violent fluctuations in roadbed frozen region, and thus generate the office of roadbed stress field Portion's collection neutralizes the acute variation of subgrade deformation, and subgrade stability constitutes great influence.And these situations are on the utility model After stating example implementation, previous rough sledding is changed completely, and subgrade stability is substantially enhanced, as shown in Figure 5.

(3) roadbed longitudinal cracking engineering disease producing cause is substantially eliminated.The important secondary engineering that heat pipe generates after implementing Disease is the longitudinal cracking of roadbed, and basic reason is 0 DEG C of isopleth, the non-planarization of Temperature Field isopleth, violent Volt concussion.Meanwhile the poly- of the region is led to due to the water proof of the recessed and frozen soil layer of 0 DEG C of isopleth in roadbed central area Water.Therefore during roadbed season-year change, violent frost heave and thaw collapse can occur for roadbed, also result in roadbed longitudinal cracking It is a large amount of to generate.The utility model examples detailed above then essentially eliminates this kind of role and influence.

It is necessary to be noted that examples detailed above calculate analysis be only for convenient for those skilled in the art from example It goes to understand the embodiment of the utility model content, conclusion energy in concept and trend (being certainly in specific value can be distinguishing) Enough represent any example in scope of protection of the utility model, this point is from herein from structure to function, function to beneficial effect The property shifted onto analysis can find out.

Technical solution provided by the utility model is described in detail above.Specific case pair used herein The principles of the present invention and embodiment are expounded, and the above embodiments are only used to help understand, and this is practical new The structure and its core concept of type.It is practical not departing from it should be pointed out that for those skilled in the art Under the premise of new principle, several improvements and modifications can be made to this utility model, these improvement and modification also fall into this In the protection scope of utility model claims.

Claims (7)

1. a kind of straight cutting oblique cutting alternative expression heat pipe road structure, which is characterized in that the road structure includes road foundation (3), sets Several heat pipes on roadbed (3) two sides road shoulder and it is located at the thermal insulation thermal insulation board that roadbed (3) is internal, horizontal direction is laid with (5)；Heat pipe on ipsilateral road shoulder by angle-inserting type heat pipe (1) and direct insertion heat pipe (2) alternately, be uniformly distributed and formed.

2. road structure as described in claim 1, which is characterized in that the original of the thermal insulation thermal insulation board (5) away from the roadbed (3) 0.5 ~ 2 m of natural earth's surface.

3. road structure as claimed in claim 1 or 2, which is characterized in that the thermal insulation thermal insulation board (5) is XPS insulation board.

4. road structure as described in claim 1, which is characterized in that opposite heat pipe is on the road shoulder of roadbed (3) two sides Different types of heat pipe.

5. road structure as described in claim 1, which is characterized in that on ipsilateral roadbed (3) road shoulder between adjacent heat pipe between Away from for 1 ~ 5m.

6. road structure as described in claim 1, which is characterized in that the angle-inserting type heat pipe (1) is embedded in roadbed (3) Oblique cutting part and roadbed (3) top surface are in 30 ° ~ 60 °.

7. road structure as described in claim 1, which is characterized in that the road structure further includes along the roadbed (3) slope surface The slope surface temperature regulating and controlling mechanism (4) of setting.