Composite foundation and pavement structure

Abstract

The utility model provides a composite foundation and a pavement structure. The composite foundation is used for paving a road surface in a permafrost region. The composite foundation comprises a straining beam, a supporting assembly and a protection assembly. The number of the straining beams is multiple, and the multiple straining beams are arranged in parallel. The supporting assembly is arranged on the straining beam and comprises multiple pile bodies, and the multiple pile bodies are evenly distributed in the axis direction of the straining beam. The protection assembly is arranged on the straining beam and located on the face, away from the supporting assembly, of the straining beam. When the composite foundation provided by the utility model is constructed, the pile body is directly arranged in the frozen soil, the processes of digging, replacing and filling, heating and the like do not need to be carried out on the frozen soil, the ecological environment of the frozen soil cannot be influenced, and the composite foundation is relatively low in cost and easy to construct.

Description

Technical Field

[0001] The utility model relates to the field of pavement laying in permafrost regions, and more specifically, to a composite foundation and a pavement structure. Background Art

[0002] In China, permafrost is mainly distributed in high mountain areas such as the Qinghai-Tibet Plateau and high-latitude areas such as the Greater and Lesser Hinggan Mountains and the northern part of the Songnen Plain in Northeast China, with a total area of about 2.15 million square kilometers, accounting for about 1 / 5 of China's land territory area. With the development of China's economic construction, it is inevitable to build expressways (or highways) in permafrost regions. The diseases of highway engineering in permafrost regions are mainly concentrated in the foundation, and the uneven deformation of frozen soil foundations generally includes uneven settlement, wave deformation, etc.

[0003] In related technologies, the protection measures for frozen soil foundations can be divided into passive protection measures and active protection measures. Passive protection measures prevent the ground temperature from rising or slow down the degradation of permafrost by methods such as excavating frozen soil, heating and replacing it to raise the embankment height, laying heat preservation boards and other materials, setting sunshades, and changing the color of the embankment surface. Active protection is to use active heat preservation and cooling methods such as ventilation pipes, thermosyphons, rubble, and rock riprap slopes to transform the thermal condition of frozen soil so that the foundation frozen soil remains in a relatively stable state during operation. However, the above methods are not conducive to the ecological environment protection and restoration of frozen soil, and the piled-up excavated frozen soil is prone to secondary hazards. In addition, the methods of excavating, replacing, and heating and pre-thawing frozen soil have large engineering quantities and high costs. Content of the Utility Model

[0004] In order to overcome the defects existing in related technologies, the utility model provides a composite foundation and a pavement structure.

[0005] The embodiments of the utility model are implemented as follows:

[0006] A composite foundation is used for paving a pavement in a permafrost region. The composite foundation includes a tie beam, a support assembly, and a protection assembly. A plurality of tie beams are provided, and the plurality of tie beams are arranged in parallel. The support assembly is arranged on the tie beam, and the support assembly includes pile bodies, and a plurality of the pile bodies are evenly distributed along the axis direction of the tie beam. The protection assembly is arranged on the tie beam and on the side of the tie beam away from the support assembly.

[0007] Furthermore, the plurality of pile bodies arranged on the tie beam are staggeredly arranged with the pile bodies arranged on the adjacent tie beam.

[0008] Furthermore, the distance between two adjacent tie beams is L1, and the distance between each of the pile bodies on the tie beam is L2, satisfying: L1 ≤ L2.

[0009] Furthermore, the pile body includes a pile body frame which is arranged in the soil body, and concrete is poured into the pile body frame to form the pile body.

[0010] Furthermore, the pile body frame is arranged as a steel reinforcement cage which includes a connecting member, and the connecting member extends towards the cross beam to the outside of the pile body, and the connecting member is fixedly connected to the cross beam.

[0011] Furthermore, the cross beam includes a cross beam frame which is placed on the pile body, and the cross beam frame is vertically arranged with respect to the pile body; concrete is poured into the cross beam frame to form the cross beam.

[0012] Furthermore, the connecting member extends into the cross beam frame and is wound around the cross beam frame.

[0013] Furthermore, the protection assembly includes a geotextile which is laid on the cross beam, and the geotextile can cover the cross beam.

[0014] Furthermore, the pile body is vertically arranged in the soil body, and the length of the pile body is L3, satisfying L3≥4m.

[0015] The present utility model also provides a road surface structure, including a road surface and the composite foundation described in any one of the above embodiments, and the road surface is laid on the protection assembly.

[0016] The beneficial effects of the embodiments of the present utility model are:

[0017] For the composite foundation provided by the present utility model, when in use, multiple support assemblies are arranged on the same cross beam to support the cross beam, and multiple cross beams are arranged side by side and parallel to form a foundation, and the protection assembly is arranged on multiple cross beams.

[0018] Among them, the pile body is fixedly arranged in the frozen soil, and multiple pile bodies are arranged on multiple support assemblies. The pile body restricts the soil body. When the soil body deforms due to frost heaving or thaw settlement, it will be restricted by the pile body. That is, when the frozen soil undergoes frost heaving, the soil body will expand upward. At this time, the influence of frost heaving on the pile body is small, and the pile body will provide a downward resistance to the soil body; when the frozen soil undergoes thaw settlement, the soil body will sink downward. At this time, the pile body will provide an upward resistance to the soil body to reduce the deformation amount of the frozen soil and avoid damage to the foundation.

[0019] For the composite foundation provided by the present utility model, during construction, the pile body can be directly arranged in the frozen soil without the need for processes such as excavation, replacement filling, heating, etc. of the frozen soil, which will not affect the ecological environment of the frozen soil, and has relatively low cost and is easy to construct. Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0021] Figure 1 Structural schematic diagram of a perspective view of the composite foundation and pavement structure of the embodiment of the present utility model;

[0022] Figure 2 Structural schematic diagram of a perspective view of the composite foundation of the embodiment of the present utility model;

[0023] Figure 3 Structural schematic diagram of a perspective view of the pile body and soil body of the embodiment of the present utility model;

[0024] Figure 4 Structural schematic diagram of a perspective view of the composite foundation and soil body of the embodiment of the present utility model;

[0025] Figure 5 Structural schematic diagram of a perspective view of the pile body of the embodiment of the present utility model;

[0026] Figure 6 Structural schematic diagram of a perspective view of the tie beam of the embodiment of the present utility model.

[0027] Icon:

[0028] 100 - Tie beam; 110 - Tie beam frame; 200 - Support assembly; 210 - Pile body; 211 - Pile body frame; 212 - Connector; 300 - Protection assembly; 400 - Pavement structure. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0033] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0034] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] The present application provides a composite foundation to solve the problems in the related art that the protection measures for frozen soil foundations have high costs, complex construction processes, and are not conducive to the ecological environment protection and restoration of frozen soil.

[0036] Please refer to Figure 1 、 Figure 2 , a composite foundation for laying a road surface in permafrost regions. The composite foundation includes a tie beam 100, a support assembly 200, and a protection assembly 300. There are multiple tie beams 100, and the multiple tie beams 100 are arranged in parallel. The support assembly 200 is arranged on the tie beam 100. The support assembly 200 includes pile bodies 210, and multiple pile bodies 210 are evenly arranged along the axial direction of the tie beam 100. The protection assembly 300 is arranged on the tie beam 100 and is located on the side of the tie beam 100 away from the support assembly 200.

[0037] Specifically, when using the composite foundation of this embodiment, a plurality of pile bodies 210 are sequentially arranged at appropriate positions, and then the tie beams 100 are installed on the pile bodies 210. The installed tie beams 100 are then installed at the position to be paved in the permafrost area. Then, the next tie beam 100 is processed, and the above operations are repeated to arrange a plurality of tie beams 100 side by side and parallel at the position to be paved. After a plurality of tie beams 100 are laid, the protection component 300 is arranged on the tie beams 100 to protect the tie beams 100, and the laying of the composite foundation is completed.

[0038] In the composite foundation of this embodiment, the pile bodies 210 are arranged in the frozen soil. When the frozen soil is affected by seasonal changes or other external factors and its temperature changes, the thermodynamic properties of the frozen soil will change accordingly. When the temperature drops, the ice content in the frozen soil will increase, and the frozen soil will expand due to frost heaving, which will damage the foundation. At this time, since there are a plurality of pile bodies 210 arranged in the frozen soil, the pile bodies 210 will restrain the frozen soil when the frozen soil expands due to frost heaving, and provide a resistance force in the direction opposite to the movement trend for the frozen soil, that is, the pile bodies 210 will provide a downward resistance force for the frozen soil, inhibiting the expansion of the frozen soil or reducing the deformation degree of the frozen soil, thereby protecting the foundation. Correspondingly, when the temperature rises and the ice content in the frozen soil decreases, and the frozen soil undergoes thaw settlement, the frozen soil will sink downward, and the pile bodies 210 will also provide an upward resistance force for the frozen soil, inhibiting the thaw settlement of the frozen soil or reducing the thaw settlement degree of the frozen soil, and protecting the foundation.

[0039] Among them, frost heaving refers to the phenomenon that in a low-temperature environment, the unfrozen water in the soil freezes into ice, the volume of the soil expands, and the foundation undergoes frost heave deformation under the action of frost heave force. Thaw settlement refers to the phenomenon that when the temperature rises, the frozen water in the frozen soil melts, and the foundation may undergo settlement or subsidence.

[0040] It should be noted that due to the particularity of the frozen soil itself, when external environmental factors change, such as rising temperature, engineering interference, etc., it will lead to the degradation of the permafrost table. As a soil body with high thermal sensitivity, the thermodynamic properties of the frozen soil are closely related to temperature, and even slight temperature changes may cause huge changes in the thermodynamic properties of the frozen soil.

[0041] The diseases of highway engineering in permafrost areas are mainly concentrated in the foundation. The uneven deformation of the permafrost foundation generally includes uneven settlement, wave deformation, etc. Uneven deformation is one of the typical diseases of the foundation in permafrost areas and is the result of the combined action of various factors. Uneven settlement generally shows lateral uneven deformation, with obvious slope directionality and zonation. Wave deformation shows longitudinal uneven deformation. The harm caused by uneven deformation is great, seriously affecting the use and service life of the road, and also causing varying degrees of obstacles to the driving of vehicles on the road.

[0042] High-grade highways are mostly wide foundations. In related technologies, the treatment measures for uneven deformation of foundations are limited by cost and are mostly concentrated within a certain range of the foundation edge. However, vehicles usually travel in the middle of the highway, and the vehicle load is also mainly concentrated in the middle of the foundation, causing the middle of the foundation to slowly and continuously sink downward, and the foundation surface deformation is "U" shaped. The treatment measures in related technologies are difficult to achieve the purpose of effectively controlling settlement.

[0043] In this embodiment, the pile bodies 210 are evenly distributed on the entire tie beam 100, that is, any load applied to any position of the tie beam 100 can be transmitted to the frozen soil through the pile bodies 210. If frost heave or thaw settlement occurs at any position of the frozen soil, the pile bodies 210 can restrain and limit the frozen soil and resist deformation, so that this embodiment can effectively avoid uneven deformation of the foundation.

[0044] In some embodiments, for example, Figure 1 , Figure 2 As shown, the multiple pile bodies 210 arranged on the tie beam 100 are staggered with the pile bodies 210 arranged on the adjacent tie beams 100. The multiple pile bodies 210 are evenly distributed on the tie beams 100, which can disperse the load borne by the tie beams 100 to a larger frozen soil area, reduce the pressure borne by a single pile body 210, thereby improving the overall stability and bearing capacity of the structure of the present embodiment, and ensuring that the structure is still stable in the case of frost heave or thaw settlement. In addition, the pile bodies 210 on the adjacent tie beams 100 are staggered, that is, the pile bodies 210 are distributed in a plum blossom shape as a whole, which can better resist the pressure generated when the frozen soil frost heaves, and when the frozen soil frost heaves, it will also be glued together with the pile bodies 210, reducing the impact of frost heave on the structure, and at the same time enhancing the constraint force of the pile bodies 210 on the frozen soil. When the frozen soil melts at a high temperature, the pile bodies 210 can also play a supporting role and reduce the structural sinking caused by thaw settlement.

[0045] In some embodiments, illustratively, the distance between two adjacent tie beams 100 is L1, and the distance between the piles 210 on the tie beams 100 is L2, satisfying: L1≤L2. The distance between two adjacent tie beams 100 is less than the distance between the two piles 210 on the tie beams 100, that is, the distance between the piles 210 of the whole of this embodiment is controlled to ensure that the piles 210 can be evenly distributed as a whole in the composite foundation of this embodiment. In this way, the overall structure of this embodiment can be made more reliable and compact, the relative displacement between the tie beams 100 can be avoided, the overall stability of the composite foundation can be improved, the integrity of the structure can be maintained, and the safety of the entire pavement structure 400 can be improved. In addition, the distance between adjacent tie beams 100 is not greater than the distance between the piles 210, which can avoid the situation where only a single tie beam 100 bears the load as much as possible, so that the force borne by the tie beam 100 can be transmitted to multiple piles 210, the durability of the composite foundation can be improved, and the maintenance cost can be reduced.

[0046] When the soil is in a negative temperature environment, the water in the soil freezes into ice, causing the volume to expand and the soil to produce an upward frost heave displacement. If the frost heave deformation of the soil is not restricted by external conditions, the frost heave at this time is free frost heave. In this embodiment, the frost heave deformation of the soil is restricted by the pile body 210, and the frost heave at this time is constrained frost heave. When the frost heave of the soil is restricted, the pile body 210 not only inhibits the frost heave of the soil, but the soil also cements with the pile body 210 and exerts a force on the pile body 210, and this force is the frost heave force.

[0047] In some embodiments, by way of example, such as Figure 3 , Figure 4 shown, the frost heave forces acting on the basis of the pile body 210 can be divided into three categories: tangential frost heave force, normal frost heave force, and horizontal frost heave force. Among them, the horizontal frost heave force around the pile body 210 can cause the frozen soil to squeeze on the pile body 210, applying force evenly in the circumferential direction to form an equilibrium state and increasing the friction between the pile body 210 and the frozen soil. The tangential frost heave force points from the frozen soil to the unfrozen soil. The normal frost heave force is the main acting force for the frost heave of the soil. In this embodiment, the normal frost heave force has less impact on the pile body 210. At the same time, the pile body 210 can also limit the movement of the surrounding soil, playing a role in reducing the frost heave deformation.

[0048] As Figure 3 , Figure 4 shown, the closer to the position of the pile body 210, the smaller the frost heave amount of the frozen soil, that is, the smaller the deformation amount of the frozen soil. In this embodiment, a plurality of pile bodies 210 are evenly arranged, and between the plurality of pile bodies 210, the frost heave amount of the frozen soil can be effectively controlled within a reasonable range to avoid affecting the foundation.

[0049] In some embodiments, by way of example, such as Figure 5 shown, the pile body 210 includes a pile body frame 211. The pile body frame 211 is arranged in the soil, and concrete is poured into the pile body frame 211 to form the pile body 210. During construction, the pile body frame 211 is pre-placed in a suitable position and driven into the predetermined position by a pile driver. After installation and inspection without error, pouring is carried out to form the pile body 210. During the installation process, the overall weight of the pile body frame 211 is relatively light and the structure is relatively simple, avoiding deviation in the installation position and improving the construction accuracy of this embodiment. In addition, even if there is a deviation in the installation position, it can be corrected in time after discovery, making the construction process of this embodiment simpler and more reliable.

[0050] The pile body 210 is formed by pouring concrete, which can ensure that the pile body 210 has sufficient support strength and the support for the tie beam 100 is stable and reliable.

[0051] In some embodiments, by way of example, such asFigure 5 As shown, the pile body frame 211 is set as a steel reinforcement cage. The steel reinforcement cage includes a connecting member 212, and the connecting member 212 extends towards the approach of the cross beam 100 to the outside of the pile body 210, and the connecting member 212 is fixedly connected to the cross beam 100. Setting the pile body frame 211 as a steel reinforcement cage makes the overall strength of the pile body 210 higher and more reliable during use. A connecting member 212 is provided on the steel reinforcement cage, and the connecting member 212 is wound around the cross beam 100. After the winding is completed, pouring is carried out. On the one hand, it can ensure the overall strength of the pile body 210, and on the other hand, it can make the connection between the pile body 210 and the cross beam 100 reliable, facilitating the timely and smooth transfer of the load on the cross beam 100 to the pile body 210 after the cross beam 100 bears the load.

[0052] After the pile is formed, the original foundation at the position of the pile body 210 is low-strength soil, which is replaced by a high-strength and dense reinforced concrete pile body 210 of equal volume, forming a composite foundation for the original foundation. Since the strength and anti-deformation ability of the reinforced concrete pile are better than those of the soil, the composite foundation formed after adding piles to the foundation has a higher bearing capacity than the original foundation.

[0053] Under the action of the load, due to the relatively large elastic modulus and strength of the soil pile body 210 in the composite foundation, the load transmitted by the cross beam 100 gradually concentrates on the pile body 210. Therefore, the pile body 210 becomes the main load-bearing body, and the load borne by the foundation soil relatively decreases, improving the strength of the composite foundation and enhancing the bearing capacity.

[0054] In some embodiments, by way of example, such as Figure 6 As shown, the cross beam 100 includes a cross beam frame 110. The cross beam frame 110 is placed on the pile body 210, and the cross beam frame 110 is perpendicular to the pile body 210; concrete is poured into the cross beam frame 110 to form the cross beam 100. The cross beam 100 is also formed by the cooperation of the cross beam frame 110 and concrete, ensuring the reliable overall strength of the cross beam 100 and enabling the cross beam 100 to stably and reliably support the road surface. The loads from vehicles received by the cross beam 100 are all transmitted downward in the vertical direction. The cross beam 100 is perpendicular to the pile body 210, and the pile body 210 supports the cross beam 100, ensuring the smooth transfer of the load on the cross beam 100.

[0055] In some embodiments, by way of example, such as Figure 6 As shown, the connecting member 212 extends into the cross beam frame 110 and is wound around the cross beam frame 110. Specifically, when constructing this embodiment, first install the pile body frame 211 at a suitable position, then connect and fix the pile body frame 211 and the cross beam frame 110 through the connecting member 212, and then pour the pile body 210 and the cross beam 100 in sequence, further ensuring the strength of the pile body 210 and the cross beam 100, as well as the connection effect between the pile body 210 and the cross beam 100.

[0056] In some embodiments, for example, Figure 1 As shown, the protection component 300 includes geotextile, which is laid on the cross beam 100 and can cover the cross beam 100. Geotextile is a synthetic material used in civil engineering and construction projects, usually made of polyester fiber, polypropylene fiber or other synthetic fibers. Geotextile has good isolation and protection functions. Laying geotextile on the cross beam 100 and the soil can effectively protect the cross beam 100 and the soil.

[0057] Specifically, the geotextile can prevent moisture on the road surface from seeping down, and at the same time prevent the loss of fine-grained soil, so as to maintain the integrity of the soil structure within the foundation range. In addition, the geotextile can enhance the bearing capacity of frozen soil and improve the stability of the frozen soil structure. Moreover, the geotextile also has good chemical corrosion resistance and wear resistance, can be used in harsh environments, and can remain intact under the heavy pressure or friction of vehicles and will not be easily damaged.

[0058] In some embodiments, for example, the pile body 210 is vertically arranged in the soil, and the length of the pile body 210 is L3, satisfying L3≥4m. According to a large number of investigations, when the treatment depth of frozen soil reaches 3m, the deformation of the frozen soil foundation can basically be controlled within the construction specified range. Therefore, in this embodiment, the length of the pile body 210 is set to at least 4m, which can not only reduce the influence of frozen soil on the pile body 210 during frost heaving or thaw settlement, but also restrain the frozen soil through the pile body 210, reduce the deformation degree of the frozen soil, and further improve the stability of this embodiment.

[0059] The present utility model also provides a construction process of a composite foundation. The specific construction process is as follows:

[0060] S10 Surface cleaning;

[0061] For the subgrade construction on frozen soil, before the excavation and section filling construction, the surface sundries must be treated, the width of the pre-section must be measured, and the site must be cleared. Then use a roller to fully compact the subgrade bottom.

[0062] S20 Construction of reinforced concrete steel pipe piles;

[0063] Set out the pile positions by lofting, and pre-bury precast concrete pile tips or place dry-mixed concrete on the surface pile positions;

[0064] The pile driver is in place, and the inner ramming pipe is placed in the outer pipe of the pile body 210 and aligned with the pile position;

[0065] Hammer the outer pipe to ram the pipe into the design depth;

[0066] The inner ramming pipe is pulled out from the outer pipe, and the reinforcing hoop at the upper end of the outer pipe is removed;

[0067] Pour 0.5 height of concrete into the ramming and expanding part;

[0068] The designed height for the outer pipe to be pulled out is 4 meters;

[0069] Lower the inner ramming pipe and ram the concrete in the outer pipe out of the pipe first;

[0070] Under the action of hammering, make the outer pipe and the ramming pipe sink synchronously to the designed height;

[0071] Pull the inner ramming pipe above the outer pipe;

[0072] Fill the pile body part with concrete. The concrete is selected as C30 concrete. First, pour the concrete to the bottom elevation of the cage, put in the steel cage, and then fill the pile body with concrete when binding the steel cage;

[0073] Press the weight of the diesel hammer and the inner ramming pipe on the concrete in the pipe, and pull up the outer pipe while pressing.

[0074] Construct the S30 crossbeam 100;

[0075] When lowering the steel cage under the reinforced concrete pile, the main reinforcement rises 40 cm outside. When fabricating the steel cage of the crossbeam 100 structure, connect the upper crossbeam 100 structure steel cage and the lower pile steel cage by binding, and then complete the concrete pouring.

[0076] Backfill the S40 soil (inside the framework), lay geotextile, fill in layers, and compact it densely.

[0077] The present utility model also provides a road surface structure 400, including a road surface and the composite foundation in any one of the above embodiments. The road surface is laid on the protection component 300.

[0078] The road surface structure 400 provided in this embodiment includes the composite foundation in any one of the above embodiments, and thus has all the beneficial effects of the above composite foundation, which will not be elaborated here.

[0079] The above is only the preferred embodiment of the present utility model and is not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A composite foundation for laying a road surface in permafrost regions, characterized in that, The composite foundation includes: A tie beam (100), multiple tie beams (100) are provided, and the multiple tie beams (100) are arranged in parallel; A support assembly (200), the support assembly (200) is arranged on the tie beam (100), the support assembly (200) includes a pile body (210), and multiple pile bodies (210) are evenly arranged along the axial direction of the tie beam (100); A protection assembly (300), the protection assembly (300) is arranged on the tie beam (100) and is located on the side of the tie beam (100) away from the support assembly (200).

2. The composite foundation according to claim 1, wherein, The multiple pile bodies (210) arranged on the tie beam (100) are staggered with the pile bodies (210) arranged on the adjacent tie beam (100).

3. The composite ground according to claim 1, characterized in that, The distance between two adjacent tie beams (100) is L1, and the distance between the pile bodies (210) on the tie beam (100) is L2, satisfying: L1 ≤ L2.

4. The composite ground according to claim 1, wherein, The pile body (210) includes a pile body frame (211), the pile body frame (211) is arranged in the soil, and concrete is poured into the pile body frame (211) to form the pile body (210).

5. The composite foundation according to claim 4, characterized in that, The pile body frame (211) is arranged as a steel reinforcement cage, the steel reinforcement cage includes a connecting member (212), and the connecting member (212) extends towards the tie beam (100) to the outside of the pile body (210), and the connecting member (212) is fixedly connected to the tie beam (100).

6. The composite foundation according to claim 5, characterized in that, The tie beam (100) includes a tie beam frame (110), the tie beam frame (110) is placed on the pile body (210), and the tie beam frame (110) is perpendicular to the pile body (210); concrete is poured into the tie beam frame (110) to form the tie beam (100).

7. The composite foundation according to claim 6, characterized in that, The connecting member (212) extends into the tie beam frame (110) and is wound around the tie beam frame (110).

8. The composite foundation according to claim 1, wherein, The protection assembly (300) includes a geotextile, the geotextile is laid on the tie beam (100), and the geotextile can cover the tie beam (100).

9. The composite foundation according to claim 1, characterized in that, The pile body (210) is vertically arranged in the soil, and the length of the pile body (210) is L3, satisfying L3 ≥ 4m.

10. A road surface structure (400), characterized in that, Including a road surface and the composite foundation according to any one of claims 1 to 9 above, the road surface is laid on the protection assembly (300).

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