Deformed ground area hinge type splicing ventilation roadbed and construction method thereof

Abstract

The present application relates to a kind of adaptive deformation's frozen earth area hinged splicing ventilation roadbed and its construction method.Existing ventilation roadbed cannot adapt to ground deformation, which can easily lead to damage and failure, and the connection mode of ventilation pipe is unreasonable.The ventilation roadbed of the present application includes several Z-shaped ventilation prefabricated assembly components arranged transversely in parallel, which are sequentially spliced in the longitudinal direction.The component is a square tube box structure with ventilation holes, and the lower part of one side of the outer wall protrudes to form a support body, and the upper part of the other side of the symmetrical outer wall protrudes to form a pressure contact body.When spliced longitudinally, the pressure contact body of one component is overlaid on the support body of another component, and the overlap is connected by pre-embedded steel connecting key.The present application allows relative rotational displacement between Z-shaped ventilation prefabricated assembly components through specially designed hinged connection structure, to adapt to the uneven settlement deformation of frozen ground, and avoid component damage and failure due to ground deformation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road subgrade engineering, in particular to a hinged spliced ventilation subgrade suitable for deformation in permafrost regions and a construction method thereof. BACKGROUND

[0002] The ventilation subgrade is an engineering measure for reducing the temperature of permafrost, which has been proved by practical engineering to have the effect of controlling the temperature rise of permafrost and maintaining the stability of the upper limit of permafrost. In cold seasons, cold air enters the buried ventilation pipe in the subgrade, and through the convection of air in the ventilation pipe, the heat of the soil around the ventilation pipe is continuously taken away, so as to protect the frozen state of the foundation soil. However, the ventilation subgrade needs to be in a specific climate environment to play the effect of heat dissipation and cold conduction. When the ratio of the freezing index to the thawing index in the ventilation pipe is greater than 2, the ventilation subgrade can cool the permafrost in the foundation. According to the investigation data of the Qinghai-Tibet Railway, the ratio of the freezing index to the thawing index in the Chu Maer River, Wudaoliang, Fenghuoshan and Tumen regions of the permafrost region is 3.5-6.8, and the index ratio in the hot spring region and the Tuotuo River region is also above 2.2. The ventilation subgrade in these regions can achieve relatively good results.

[0003] At present, the ventilation subgrade pays less attention to the stress state of the ventilation component after the deformation of the permafrost foundation, especially when the subgrade width is large, the mechanical properties of the ventilation component gradually become prominent. According to the field investigation, the existing ventilation subgrade has many drawbacks. First, the permafrost foundation is composed of seasonal active layer and permafrost layer, and the construction of the subgrade will destroy the original thermal balance of the surface. When the thermal balance of the frozen soil is broken, part of the permafrost will degrade, the thickness of the active layer will increase, and therefore the uneven settlement of the permafrost foundation will be caused. This deformation causes the straight ventilation pipe to locally bend and even be damaged, thereby increasing the air resistance along the way or even losing the ventilation capacity. In addition, the ventilation component is inconvenient to splice on site, and the compaction is not easy. The ventilation pipe used in the current permafrost subgrade adopts a connection mode of large and small mouth lap joints, and the backfilling method is used for pipe backfilling, but the soil compaction is not easy, and the pipe body damage rate is high during construction.

[0004] Therefore, it is necessary to propose a new ventilation subgrade structure to overcome the drawbacks of the prior art. SUMMARY

[0005] The purpose of the present application is to provide a hinged spliced ventilation subgrade suitable for deformation in permafrost regions and a construction method thereof, so as to solve the problems of the existing ventilation subgrade, such as the inability to adapt to the deformation of the foundation, the easy damage and failure, and the unreasonable connection mode of the ventilation pipe.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] The application discloses a hinge joint ventilation roadbed suitable for deformed permafrost regions, which comprises a plurality of Z-shaped ventilation prefabricated assembly components arranged in transverse parallel mode, and the Z-shaped ventilation prefabricated assembly components are sequentially jointed in longitudinal direction.

[0008] The Z-shaped ventilation prefabricated assembly component is a square tube box structure with ventilation holes, and a support body is formed on one side of the outer wall of the square tube box structure and protrudes downward, and a press-contact body is formed on the other side of the outer wall and protrudes upward.

[0009] When two Z-shaped ventilation prefabricated assembly components are longitudinally jointed, the press-contact body of one Z-shaped ventilation prefabricated assembly component is overlaid on the support body of the other Z-shaped ventilation prefabricated assembly component, and the overlapped part is connected through a pre-embedded steel connecting key.

[0010] Further, the pre-embedded steel connecting key is vertically embedded in the support body, and the upper part of the pre-embedded steel connecting key is exposed to the support body.

[0011] Further, the press-contact body is provided with a vertically penetrating connecting key insertion hole.

[0012] When the press-contact body is overlaid on the support body, the pre-embedded steel connecting key is inserted into the connecting key insertion hole upward.

[0013] Further, a gap is formed between two longitudinally adjacent Z-shaped ventilation prefabricated assembly components, and a Z-shaped deformation joint is formed.

[0014] Further, the top surface of the support body is provided with a rubber pad, and the rubber pad is provided with a through hole for inserting the pre-embedded steel connecting key.

[0015] When the press-contact body is overlaid on the support body, the press-contact body is overlaid above the rubber pad.

[0016] Further, a broken stone leveling layer is laid below the Z-shaped ventilation prefabricated assembly component.

[0017] Further, a geotextile is laid above the Z-shaped ventilation prefabricated assembly component, and a filled soil roadbed is laid above the geotextile.

[0018] Further, the edges of the press-contact body and the edges of the support body are chamfered.

[0019] On the other hand, a construction method of the hinge joint ventilation roadbed suitable for deformed permafrost regions is provided, and the method comprises the following steps.

[0020] The Z-shaped ventilation prefabricated assembly component is prefabricated in a factory.

[0021] A preset embedded steel connecting key is arranged on the support body of the Z-shaped ventilation prefabricated assembly component, and a connecting key insertion hole is preset on the pressure contact body of the Z-shaped ventilation prefabricated assembly component;

[0022] Laying a broken stone leveling layer;

[0023] Hoisting a Z-shaped ventilation prefabricated assembly component into place, and installing a rubber pad at the embedded steel connecting key of the Z-shaped ventilation prefabricated assembly component;

[0024] Hoisting the next Z-shaped ventilation prefabricated assembly component and lowering it, so that the embedded steel connecting key of the support body of the previous Z-shaped ventilation prefabricated assembly component is inserted into the connecting key insertion hole of the pressure contact body of the next Z-shaped ventilation prefabricated assembly component, and grouting is performed in the connecting key insertion hole for sealing;

[0025] After hoisting and splicing in sequence, laying geotextile and filling the roadbed on all Z-shaped ventilation prefabricated assembly components.

[0026] Further, the method further comprises:

[0027] The deformation joint is left between adjacent Z-shaped ventilation prefabricated assembly components, and the deformation joint is filled with hemp wadding.

[0028] Compared with the prior art, the method has the following beneficial effects:

[0029] 1. The frozen soil area ventilation roadbed provided by the method is composed of Z-shaped ventilation prefabricated assembly components through hinged splicing, and the adaptability requirement of the roadbed to the deformation of the frozen soil foundation is met. Through the special designed hinged connecting structure, relative rotating displacement between the Z-shaped ventilation prefabricated assembly components is allowed, so as to adapt to the uneven settlement deformation of the frozen soil foundation and avoid the damage and failure of the components caused by the deformation of the foundation.

[0030] 2. In the frozen soil area ventilation roadbed, the support body and the pressure contact body are arranged on the left and right outer walls of the Z-shaped ventilation prefabricated assembly component, the components are connected to each other in an upper and lower lap joint mode during construction, the bearing capacity of the splicing position is improved, the defect that the filling compaction is not easy is effectively avoided, and the damage of the components is reduced.

[0031] 3. In the frozen soil area ventilation roadbed, the cross section of the Z-shaped ventilation prefabricated assembly component is optimized and designed, thin-walled components are used to reduce the weight of a single piece under the premise of ensuring the ventilation volume, and the hoisting demand and transportation cost are effectively reduced.

[0032] 4. In the frozen soil area ventilation roadbed, the Z-shaped ventilation prefabricated assembly component is produced by centralized prefabrication in a factory, and the quality is uniform and guaranteed. In the high-cold and oxygen-deficient environment, the mechanical splicing is used on site, the labor intensity is reduced, and the construction purposes of standardization, assembly and mechanization are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these accompanying drawings without any creative effort.

[0034] Figure 1 is a cross-sectional view of the roadbed of the present application.

[0035] Figure 2 is an elevation view of the roadbed of the present application.

[0036] Figure 3 is a schematic view of the hinged joint of the Z-shaped ventilation prefabricated assembly member.

[0037] Figure 4 is a detailed view of the joint position of the Z-shaped ventilation prefabricated assembly member.

[0038] Figure 5 is a schematic view of the joint of the roadbed of the present application.

[0039] The reference signs in the drawings are as follows:

[0040] 1 - broken stone leveling layer, 2 - Z-shaped ventilation prefabricated assembly member, 3 - embedded steel bar joint key, 4 - rubber pad, 5 - geotextile, 6 - filled roadbed, 7 - joint key insertion hole, 8 - deformation joint;

[0041] 21 - support body, 22 - crimping body, 23 - ventilation hole. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0043] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "longitudinal", "transverse", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connection", "arrangement", "installation" and the like should be understood in a broad sense, for example, they can be fixedly connected, arranged, or detachably connected, arranged, or integrally connected, arranged. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In addition, the steps "S1", "S2" and the like involved in the embodiments of the present application are only for the convenience of describing the technical solutions and understanding the specific steps and contents of the embodiments, and should not be understood as a limitation on the order of steps. Any change in the order of steps should be within the protection scope of the present application.

[0046] In the specific embodiment, the driving direction is defined as the longitudinal direction, and the direction perpendicular to the driving direction is defined as the transverse direction.

[0047] The present application provides a hinge type splicing ventilation roadbed suitable for deformation in permafrost regions, and the core structure is a plurality of Z-shaped ventilation prefabricated assembly components 2 spliced by hinges. By designing a special hinge type connection structure, relative rotational displacement between the Z-shaped ventilation prefabricated assembly components 2 is allowed, so as to adapt to the deformation of the foundation and avoid extrusion damage and displacement failure between the assembly components.

[0048] As Figure 1 and Figure 2 , the hinge type splicing ventilation roadbed suitable for deformation in permafrost regions comprises a plurality of Z-shaped ventilation prefabricated assembly components 2 arranged transversely in parallel, and the plurality of Z-shaped ventilation prefabricated assembly components 2 are spliced in sequence along the longitudinal direction.

[0049] As Figure 4 , the Z-shaped ventilation prefabricated assembly component 2 is a square tube box type structure with a ventilation hole 23, and the whole is in the shape of a strip. It is prefabricated in a factory batch homogenization production mode, the cross section is optimized under the premise of ensuring the ventilation volume, and a thin-walled component form is adopted, which effectively reduces the weight of a single piece, and also reduces the hoisting demand and transportation cost. The lower part of one side of the outer wall of the square tube box type structure protrudes to form a support body 21, and the upper part of the other side of the symmetrical outer wall protrudes to form a crimping body 22. The upper and lower parts of the outer walls on the left and right sides protrude to form the Z-shaped cross-sectional profile of the Z-shaped ventilation prefabricated assembly component 2. Figure 3 Among them, the crimping body 22 of one of the Z-shaped ventilation prefabricated assembly components 2 is overlaid on the support body 21 of the other Z-shaped ventilation prefabricated assembly component 2, and the overlapping part is connected by a pre-embedded steel bar connecting key 3. The edges of the crimping body 22 and the edges of the support body 21 are chamfered, which plays a good guiding transition role in the process of overlapping and adapting to deformation.

[0050] The embedded steel connecting key 3 is vertically embedded in the support body 21, and the upper part of the embedded steel connecting key 3 is exposed to the support body 21. The embedded steel connecting key 3 can adopt a ribbed steel bar or an anchor bolt, and the embedded length thereof should meet the minimum anchoring length requirement of the steel bar in the concrete specification, and should not be less than 30d, d being the nominal diameter of the embedded steel connecting key 3. The spacing of the embedded steel connecting key 3 is set to be 2m-3m. Correspondingly, the pressing body 22 is provided with a vertically penetrating connecting key insertion hole 7, and when the pressing body 22 is pressed on the support body 21, the embedded steel connecting key 3 is inserted upward into the connecting key insertion hole 7. The pressing body 22 is installed in a top-down insertion mode, and then cement slurry is injected into the connecting key insertion hole 7, so that the embedded steel connecting key 3 and the embedded steel connecting key 3 bear force together.

[0051] In addition, the top surface of the support body 21 is provided with a rubber pad 4, the position of the rubber pad 4 corresponds to the position of the embedded steel connecting key 3, and the rubber pad 4 is arranged in a strip shape on the top surface of the support body 21. The rubber pad 4 is provided with a through hole for inserting the embedded steel connecting key 3, and is located at the center position. When the pressing body 22 is pressed on the support body 21, the pressing body 22 is also pressed above the rubber pad 4. The rubber pad 4 can buffer the mutual extrusion between the support body 21 and the pressing body 22, and play a role of grouting sealing at the bottom of the connecting key insertion hole 7. The rubber pad 4 is made of industrial vulcanized rubber plate, and the thickness thereof is 30mm-50mm.

[0052] The longitudinally adjacent two Z-shaped ventilation prefabricated assembly components 2 have a gap therebetween, and a deformation joint 8 in a Z shape is formed. The deformation joint 8 is arranged to effectively ensure that the Z-shaped ventilation prefabricated assembly component 2 will not produce mutual extrusion after the rigid body deformation of the roadbed. The deformation joint 8 needs to be filled with cotton flock during the construction process to prevent the filling soil from entering. The width of the deformation joint 8 is 10mm-20mm. The setting method of the deformation joint 8 changes with the slope of the roadbed i The calculation is performed according to the following formula:

[0053]

[0054]

[0055] Among them:

[0056] h H is the height of the Z-shaped ventilation prefabricated assembly component;

[0057] is the design settlement deformation of the roadbed;

[0058] B is the width of the Z-shaped ventilation prefabricated assembly component.

[0059] The Z-shaped ventilation prefabricated assembly component 2 is prefabricated in a factory, uniform quality is guaranteed, and model parameters are standardized. Mechanical assembly is adopted at a construction site, and on-site hoisting is achieved through a car crane or a gantry crane scheme, which can effectively reduce the labor intensity in a high-cold and oxygen-deficient environment.

[0060] A gravel leveling layer 1 is laid below the Z-shaped ventilation prefabricated assembly component 2, the gravel leveling layer 1 is a cushion layer of the Z-shaped ventilation prefabricated assembly component 2, needs to meet the compaction degree requirement and complete surface leveling, so that the Z-shaped ventilation prefabricated assembly component 2 does not tilt and dislocate during placement. The gravel leveling layer 1 acts as a buffer below the Z-shaped ventilation prefabricated assembly component 2 and can adapt to the deformation of the foundation to a certain extent.

[0061] Geotextile 5 is laid above the Z-shaped ventilation prefabricated assembly component 2 to prevent the later upper fill from entering the deformation joint 8. The geotextile 5 is covered with coarse-grained fill and compacted to form a fill roadbed 6, which needs to meet the requirements of the highway subgrade design specification for roadbed design indicators.

[0062] The ventilation subgrade of the application can adapt to the deformation of the foundation, and the relative rotational displacement can occur between the assembly components without extrusion damage, mainly based on the following structure design:

[0063] 1. Hinged connection structure:

[0064] The outer wall of the Z-shaped ventilation prefabricated assembly component 2 has a profiled protruding part, that is, the support body 21 and the pressing body 22 arranged on the left and right sides. The support body 21 is located at the lower part and plays the role of a corbel, and the pressing body 22 is located at the upper part and can press and cover the support body 21 and be supported by the support body 21. When two Z-shaped ventilation prefabricated assembly components 2 are spliced, the support bodies 21 and the pressing bodies 22 of the two Z-shaped ventilation prefabricated assembly components 2 are overlapped with each other, are hinged through the vertical embedded steel bar connecting key 3, and form a hinged connection structure. When the foundation deforms, the embedded steel bar connecting key 3 can be bent, so that the relative rotational displacement can occur between the adjacent Z-shaped ventilation prefabricated assembly components 2. Since the edges of the pressing body 22 and the edges of the support body 21 are both chamfered, the structure can also slide along the arc when the above relative rotational displacement occurs, stress concentration does not occur, and the structure of the Z-shaped ventilation prefabricated assembly component 2 is not easy to be damaged.

[0065] 2. Rubber pad:

[0066] When the support body 21 and the pressing body 22 are overlapped with each other, a layer of rubber pad 4 is arranged between the support body 21 and the pressing body 22. The rubber pad 4 has the ability of elastic deformation, and when the foundation deforms, the relative rotational displacement occurs between the adjacent Z-shaped ventilation prefabricated assembly components 2, and the compression deformation of the rubber pad 4 can further promote the above relative rotational displacement process.

[0067] 3. Deformation joint:

[0068] A deformation joint 8 with a certain width is arranged between adjacent Z-shaped ventilation prefabricated assembly components 2, and when the foundation deforms, the adjacent Z-shaped ventilation prefabricated assembly components 2 rotate and displace relative to each other, and the deformation joint 8 provides the necessary space for the relative rotation and displacement.

[0069] The construction method of the hinge joint ventilation roadbed suitable for deformation in the permafrost region, such as Figure 5 , specifically includes the following steps:

[0070] S1: prefabricating Z-shaped ventilation prefabricated assembly components 2 in a factory.

[0071] S2: presetting a pre-embedded steel connecting key 3 on the support body 21 of the Z-shaped ventilation prefabricated assembly component 2 and presetting a connecting key insertion hole 7 on the crimping body 22 of the Z-shaped ventilation prefabricated assembly component 2.

[0072] S3: laying a gravel leveling layer 1 at a construction site.

[0073] S4: hoisting a Z-shaped ventilation prefabricated assembly component 2 into place and installing a rubber pad 4 at the pre-embedded steel connecting key 3 of the Z-shaped ventilation prefabricated assembly component 2.

[0074] S5: hoisting the next Z-shaped ventilation prefabricated assembly component 2 and slowly lowering it, so that the pre-embedded steel connecting key 3 of the support body 21 of the previous Z-shaped ventilation prefabricated assembly component 2 is inserted into the connecting key insertion hole 7 of the crimping body 22 of the next Z-shaped ventilation prefabricated assembly component 2, and grouting is performed in the connecting key insertion hole 7. A deformation joint 8 is left between adjacent Z-shaped ventilation prefabricated assembly components 2, and the deformation joint 8 is filled with flax tow.

[0075] S6: sequentially hoisting and splicing, laying geotextile 5 and filling the roadbed 6 above all Z-shaped ventilation prefabricated assembly components 2, and completing the construction of the roadbed.

[0076] Embodiment:

[0077] The roadbed and the construction method thereof of the present application are further described in detail through specific engineering examples as follows:

[0078] According to relevant research, when the diameter of the pipeline in the ventilation roadbed is greater than 60 cm, the wind speed in the pipeline tends to be stable. In order to fully meet the needs of ventilation efficiency, the internal dimensions of the box-shaped component, i.e., the Z-shaped ventilation prefabricated assembly component 2, in this embodiment vary in the range of 60 cm x 60 cm to 80 cm x 80 cm, and the wall thickness of the box-shaped component is 10 cm to 12 cm. The haunch, i.e., the support body 21, has a position width of 10 cm, the deformation joint 8 has a width of 4 cm, and the mutual lap length of the Z-shaped ventilation prefabricated assembly components 2 is 6 cm.

[0079] The anchor steel, i.e. the embedded steel connecting key 3, has a nominal diameter of φ16 mm, and an anchor length of 50 cm extending into the connecting key insertion hole 7. The embedded steel connecting key 3 is arranged in addition to the above-mentioned 2 m~3 m equidistant arrangement, and can also be arranged in a group of 2~4 steels with a steel spacing of 15 cm. The spacing between the steel group and the group center point is 5 m~10 m, and the steel group is used to reduce the number of connecting key insertion holes 7 and the number of times of moving the grouting equipment. At this time, the shape of the connecting key insertion hole 7 is a long rectangular shape.

[0080] The above application of specific examples to the present application is described, which is only used to help understand the present application, and does not limit the present application. For those skilled in the art to which the present application belongs, according to the idea of the present application, a number of simple deductions, deformations or substitutions can be made.

Claims

1. A hinged, ventilated roadbed adaptable to deformation in permafrost regions, characterized in that: The ventilation roadbed includes several Z-shaped prefabricated ventilation components (2) arranged in parallel laterally, and the several Z-shaped prefabricated ventilation components (2) are spliced ​​together in sequence along the longitudinal direction; The Z-shaped ventilation prefabricated assembly component (2) is a square tube box structure with ventilation holes (23). The lower part of one side of the outer wall of the square tube box structure protrudes to form a support body (21), and the upper part of the other side of the symmetrical outer wall protrudes to form a pressing body (22). When two Z-shaped ventilation prefabricated assembly components (2) are spliced ​​longitudinally, the pressing body (22) of one of the Z-shaped ventilation prefabricated assembly components (2) presses onto the supporting body (21) of the other Z-shaped ventilation prefabricated assembly component (2), and the overlap is connected by a pre-embedded steel bar connecting key (3); The top surface of the support (21) is provided with a rubber pad (4). There is a gap between two longitudinally adjacent Z-shaped prefabricated ventilation components (2), forming a Z-shaped expansion joint (8). The expansion joint (8) is filled with hemp fiber, and the width of the expansion joint (8) is... The setting method and the slope variation of the roadbed i Calculate using the following formula: in: h It is the height of the Z-shaped ventilation prefabricated assembly component; It is the design settlement deformation of the roadbed; B It is the width of the Z-shaped ventilation prefabricated assembly component; The edges of the pressing body (22) and the supporting body (21) are both chamfered; The pressing body (22) is provided with a vertically penetrating key insertion hole (7); when the pressing body (22) presses onto the support body (21), the pre-embedded steel bar key (3) is inserted upward into the key insertion hole (7). The rubber pad (4) is provided with a through hole for inserting the pre-embedded steel bar connecting key (3); when the pressing body (22) presses on the support body (21), it also presses on the rubber pad (4).

2. The hinged splicing ventilated roadbed for adapting to deformation in permafrost areas according to claim 1, characterized in that: The pre-embedded steel bar connecting key (3) is vertically embedded in the support body (21), and the upper part of the pre-embedded steel bar connecting key (3) is exposed outside the support body (21).

3. The hinged splicing ventilated roadbed for adapting to deformation in permafrost areas according to claim 2, characterized in that: A gravel leveling layer (1) is laid under the Z-shaped ventilation prefabricated assembly component (2).

4. The hinged splicing ventilated roadbed for adapting to deformation in permafrost areas according to claim 3, characterized in that: Geotextile (5) is laid on top of the Z-shaped prefabricated ventilated assembly component (2), and earth-filled roadbed (6) is laid on top of the geotextile (5).

5. The construction method for hinged splicing ventilated roadbed in permafrost areas adaptable to deformation as described in claim 4, characterized in that: The method includes: (2) Prefabricate Z-shaped ventilation prefabricated assembly components in the factory; Pre-embedded steel bar connecting keys (3) are pre-set on the support body (21) of the Z-shaped ventilation prefabricated assembly component (2), and connecting key insertion holes (7) are pre-set on the pressing body (22) of the Z-shaped ventilation prefabricated assembly component (2). Lay a crushed stone leveling layer (1); Hoist a Z-shaped prefabricated ventilation assembly component (2) into place, and install a rubber pad (4) at the pre-embedded steel bar connection key (3) of the Z-shaped prefabricated ventilation assembly component (2); Hoist the next Z-shaped ventilation prefabricated assembly component (2) and lower it down. Insert the pre-embedded steel bar connecting key (3) of the support body (21) of the previous Z-shaped ventilation prefabricated assembly component (2) into the connecting key insertion hole (7) of the pressing body (22) of the next Z-shaped ventilation prefabricated assembly component (2). Grout the connecting key insertion hole (7) to seal it. After being hoisted and assembled in sequence, geotextile (5) and earth-filled roadbed (6) are laid on top of all Z-shaped ventilated prefabricated assembly components (2).

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