Prefabricated roadbed ventilation components in flexible splicing form

Abstract

The present invention relates to a prefabricated roadbed ventilation component in a flexible splicing form, wherein the component includes a concrete ventilation component, which is a hollow cube with ventilation holes on the front, back, left and right sides, and the ventilation holes are connected to the central cavity to form longitudinal and transverse channels; a rubber outer wrapping layer is provided on the outside of the concrete ventilation component, and circular holes are opened on the four sides; a plurality of concrete ventilation components are laid in a plane, and prestressed steel wire grouting channels correspond to each other, and prestressed steel wires are inserted and connected to achieve longitudinal and transverse connections. The present invention forms an overhead ventilation layer that is longitudinally and transversely connected by connecting monomer prefabricated ventilation components, and a flexible buffer connection method is adopted between prefabricated components, which can adapt to the uneven freeze-thaw deformation in permafrost areas and keep the ventilation channels unobstructed.

Description

Technical Field

[0001] The invention relates to the technical field of road subgrade construction, and in particular to a road subgrade ventilation prefabricated component in a flexible splicing form. Background Art

[0002] Frozen soil refers to soil and rocks with negative temperatures and ice. It is mainly divided into permafrost and seasonally frozen soil according to its survival time. my country’s permafrost is mainly distributed in the Qinghai-Tibet Plateau, the western mountains, and the Greater and Lesser Khingan Mountains in the northeast, with a total area of ​​about 215×104km 2 , accounting for about 22.3% of my country's land area, making it the world's third largest country with the largest distribution of permafrost. The Qinghai-Tibet Plateau, with an average altitude of more than 4,500 meters, is the main distribution area of ​​permafrost in my country, with a permafrost area of ​​about 150×104km 2 , accounting for about 70% of my country's permafrost area. Affected by global warming and engineering activities, permafrost foundations are prone to temperature rise and melting, leading to uneven deformation and damage to engineering structures.

[0003] Ventilation foundation is an engineering measure to reduce frozen soil foundation, which is widely used in permafrost areas. Its regulation process is manifested as the heat flow blocking in the roadbed under forced convection conditions, wall heat exchange and heat transfer process of dissipation and evaporation, which has a cooling and protective effect on the permafrost foundation. Ventilation pipe roadbed is a representative measure in permafrost highway engineering and is widely used. Practice has shown that ventilation pipe roadbed has the disadvantages of poor heat dissipation uniformity and poor regulation uniformity. In addition, traditional ventilation pipes are very likely to cause structural deformation due to thawing and settling of frozen soil, resulting in a decrease in ventilation and cooling efficiency. In severe cases, the pipeline is blocked and loses ventilation capacity. With the continuous advancement of the construction of highways in permafrost areas, a new type of roadbed ventilation prefabricated structure that can achieve heat dissipation uniformity, cold conduction uniformity, and adapt to the freeze-thaw deformation of permafrost is urgently needed. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned prior art, the present invention provides a roadbed ventilation prefabricated component in a flexible splicing form, which is connected by single prefabricated ventilation components to form an overhead ventilation layer connected longitudinally and transversely. A flexible buffer connection method is adopted between the prefabricated components, which can adapt to the uneven freeze-thaw deformation in permafrost areas and keep the ventilation ducts unobstructed.

[0005] The technical solution adopted by the present invention is:

[0006] The roadbed ventilation prefabricated component in the form of flexible splicing is characterized by:

[0007] The component comprises a concrete ventilation component, which is a hollow cube with ventilation holes on four sides, front, back, left and right, and the ventilation holes are connected with the middle cavity to form longitudinal and transverse channels.

[0008] The bottom surface of the concrete ventilation component is evenly provided with circular through-wall holes which are connected with the central cavity.

[0009] The concrete ventilation component is provided with a rubber outer wrapping layer and circular holes are opened on four sides.

[0010] Longitudinal and transverse prestressed steel wire grouting channels are provided on the concrete ventilation component and are located at the edge of the concrete ventilation component.

[0011] Numerous concrete ventilation components are laid in a plane, and their respective vertical and horizontal passages are connected to each other to form long vertical and horizontal passages.

[0012] Numerous concrete ventilation components are laid in one plane, the prestressed steel wire grouting channels correspond to each other, and prestressed steel wires are inserted and connected to achieve vertical and horizontal connections.

[0013] Each concrete ventilation component is provided with eight prestressed steel wire grouting channels, four in the longitudinal direction and four in the transverse direction, which are located at the four corners outside the ventilation hole.

[0014] The present invention has the following advantages:

[0015] 1. Prefabricated components are spliced ​​to form an overhead ventilation layer that is fully connected in the longitudinal and transverse directions. It has a strong ability to adapt to the environmental wind direction and has a more obvious cooling effect.

[0016] 2. The ventilation components are connected by a rubber layer with a buffering effect and prestressed steel wire. The ability of the overhead ventilation layer to resist uneven deformation of frozen soil is significantly enhanced. It has the ability to adapt to freeze-thaw deformation, ensures smooth ventilation ducts, and enhances the long-term ground temperature control effect.

[0017] 3. It has a wide range of applications and broad application prospects in permafrost areas. It can not only be used for new road projects in permafrost areas, but also for the treatment of old road diseases.

[0018] In summary, the present invention has a simple structure, reasonable design, and is easy to implement and promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a splicing schematic diagram of the present invention.

[0020] Figure 2 This is a top view of the component.

[0021] Figure 3 This is a bottom view of the component.

[0022] Figure 4 It is the side view of the component.

[0023] The following are marked in the figure: concrete ventilation component (1), rubber outer wrapping layer (2), prestressed steel wire for connection (3), circular through-wall small hole (4), ventilation hole (5), and prestressed steel wire grouting channel (6). DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with specific implementation modes.

[0025] The present invention relates to a roadbed ventilation prefabricated component in a flexible splicing form, the component comprising a concrete ventilation component 1, the concrete ventilation component 1 is a hollow cube, and ventilation holes 5 are opened on the front, back, left and right sides, and the ventilation holes 5 are connected to the middle cavity to form longitudinal and transverse channels. Circular through-wall small holes 4 are evenly opened on the bottom surface of the concrete ventilation component 1, which are connected to the middle cavity.

[0026] A rubber outer wrapping layer 2 is arranged outside the concrete ventilation component 1, and circular holes are opened on four sides.

[0027] The concrete ventilation component 1 is provided with longitudinal and transverse prestressed steel wire grouting channels 6, which are located at the edge of the concrete ventilation component 1. Each concrete ventilation component 1 is provided with eight prestressed steel wire grouting channels 6, four longitudinally and four transversely, which are located at the four corners outside the ventilation hole 5.

[0028] Many concrete ventilation components 1 are laid in a plane, and their longitudinal and transverse channels are connected to each other to form a long longitudinal and transverse channel. Many concrete ventilation components 1 are laid in a plane, and the prestressed steel wire grouting channels 6 correspond to each other, and the prestressed steel wires 3 are inserted and connected to achieve longitudinal and transverse connection.

[0029] The solution of the present invention is to form an overhead ventilation layer by splicing prefabricated roadbed ventilation components. Through ventilation convection, it can effectively transfer the heat absorbed by the upper road surface and the heat dissipated by evaporation in the lower part, reduce the temperature of the permafrost under the roadbed, and increase the thermal stability of the frozen soil layer.

[0030] The present invention is further described in detail with reference to the accompanying drawings:

[0031] The present invention comprises three parts: a concrete ventilation component 1, a rubber outer wrapping layer 2 and a prestressed steel wire 3 for connection:

[0032] 1. The concrete ventilation component 1 is a hollow cube with a side length of L and is made of cement concrete; the interior of the concrete ventilation component 1 is penetrated by longitudinal and transverse ventilation holes 5, the diameter of the ventilation hole 5 is D, and the diameter D is determined by the cross-sectional width B of the roadbed; circular through-wall holes 4 are arranged at the bottom of the concrete ventilation component 1, the number is n, and the aperture is d1; prestressed steel wire grouting channels 6 with an inner diameter of d2 are arranged at the corners of the concrete ventilation component 1, the number is 8.

[0033] Among them, D<0.9L; B / D=30~40; hole diameter d1<5cm, number n>6; prestressed steel wire hole d2<3cm; the unit of L, B, d1, d2 is m.

[0034] 2. The rubber outer wrapping layer 2 adopts a "U"-shaped structure and is wrapped around the side of the concrete ventilation component 1; the thickness of the rubber outer wrapping layer 2 is t, t>5cm; a circular ventilation hole 5 with a diameter of D is set on the side of the rubber outer wrapping layer 2, which is concentric with the side hole of the concrete ventilation component 1; a circular hole with an inner diameter of d2 is set at the corner of the rubber outer wrapping layer 2, which is concentric with the prestressed steel wire grouting hole at the corner of the concrete ventilation component 1.

[0035] 3. The prestressed steel wire 3 adopts spiral ribbed steel wire or notched steel wire with a diameter of φ>5mm, a designed prestress value greater than 10Mpa, and a locking value of 0.7~0.9 times the designed prestress value; the grouting pressure of the channel is 0.5~0.7Mpa; cement mortar prepared with ordinary Portland cement with a strength grade of not less than 42.5 is adopted, and the water-cement ratio should be 0.4~0.45; the prestressed steel wire 3 adopts a circular clip-type anchor, and grouting holes are set on the anchor.

[0036] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. Prefabricated roadbed ventilation components in the form of flexible splicing, characterized by: The component comprises a concrete ventilation component (1), the concrete ventilation component (1) being a hollow cube, with ventilation holes (5) formed on the front, back, left and right sides, the ventilation holes (5) being connected to the central cavity to form longitudinal and transverse channels; The bottom surface of the concrete ventilation component (1) is evenly provided with circular through-wall small holes (4) which are connected to the central cavity; A rubber outer wrapping layer (2) is arranged outside the concrete ventilation component (1), and circular holes are opened on four sides. The rubber outer wrapping layer (2) adopts a "U"-shaped structure; The concrete ventilation component (1) is provided with longitudinal and transverse prestressed steel wire grouting channels (6) located at the edge of the concrete ventilation component (1).

2. The flexible splicing prefabricated roadbed ventilation component according to claim 1 is characterized in that: A plurality of concrete ventilation components (1) are laid in a plane, and their respective longitudinal and transverse passages are connected to each other, forming a long longitudinal and transverse passage.

3. The flexible splicing prefabricated roadbed ventilation component according to claim 1 or 2, characterized in that: A plurality of concrete ventilation components (1) are laid in a plane, the prestressed steel wire grouting channels (6) correspond to each other, and the prestressed steel wires (3) are inserted for connection to achieve vertical and horizontal connection.

4. The flexible splicing prefabricated roadbed ventilation component according to claim 3 is characterized in that: Each concrete ventilation component (1) is provided with eight prestressed steel wire grouting channels (6), four in the longitudinal direction and four in the transverse direction, located at the four corners outside the ventilation hole (5).

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