Frozen earth area railway steel corrugated pipe culvert and construction method thereof

Abstract

The present application relates to a kind of frozen soil area railway steel corrugated pipe culvert and its construction method, including steel corrugated pipe culvert body, sandy gravel structural backfill, coarse sand cushion, and sandy gravel foundation replacement or short pile foundation;For low-temperature stable frozen soil, the upper limit range of frozen soil below steel corrugated pipe culvert body is provided with sandy gravel foundation replacement;For seasonal frozen soil or soil ice layer and the foundation with higher ground temperature, the short pile foundation below steel corrugated pipe culvert body, short pile foundation includes concrete pile cap and the pile foundation below concrete pile cap.The structure of the present application, the amount of bolt is less, structure construction is fast, and labor intensity is reduced;Special structure axial joint and ring joint are set on culvert pipe, and the sealing property is good, and water flow infiltration is reduced, which is beneficial to the stability of frozen soil foundation;According to different foundation frozen soil types, different foundation structures are used, and the adaptability of foundation deformation is strong, and the generation of structure disease is reduced.

Description

Technical Field

[0001] This invention relates to the field of corrugated steel pipe culvert construction technology, specifically to a corrugated steel pipe culvert for railways in permafrost regions and its construction method. Background Technology

[0002] Traditional reinforced concrete culvert construction methods suffer from problems such as large on-site pouring workload, low construction efficiency, and difficulty in controlling pouring quality, resulting in limited applicability in high-altitude and cold regions. Reinforced concrete culverts used in high-altitude permafrost areas will exhibit varying degrees of defects, such as uneven foundation settlement leading to culvert section separation, concrete cracking and erosion, and exposed reinforcement. Furthermore, because there is a settlement joint approximately every 3 meters in reinforced concrete culverts, water seeps through these joints to the foundation, causing the upper limit of the permafrost to shift downwards, leading to foundation settlement and deformation, resulting in structural defects and creating a vicious cycle.

[0003] Corrugated steel pipe culverts are manufactured in factories and assembled on-site, typically using single-piece connections or multi-section assembly. They offer advantages such as being environmentally friendly, having strong adaptability to foundation deformation, and being easy to construct. They effectively overcome the shortcomings of reinforced concrete culverts, reducing on-site workload, increasing construction mechanization, and minimizing the impact on the fragile plateau environment. Furthermore, corrugated steel pipe culverts have good thermal conductivity; airflow within the culvert can remove heat from the foundation soil, maintaining the stability of permafrost foundations. The structure is also highly malleable, with diverse joint connection methods, allowing for the use of different reinforcement measures to meet the functional requirements of various conditions.

[0004] However, when corrugated steel pipe culverts are applied to permafrost areas along high-altitude railways, water seepage at the culvert bottom causes disturbance to the permafrost foundation, affecting structural safety. Furthermore, there are currently no suitable methods for foundation treatment in the construction areas of corrugated steel pipe culverts, which affects the thermal stability of the permafrost, leading to serious frost heave and thaw settlement problems.

[0005] Therefore, it is necessary to propose new measures to overcome the above-mentioned shortcomings. Summary of the Invention

[0006] The purpose of this invention is to provide a corrugated steel pipe culvert for railways in permafrost regions and its construction method, so as to solve the problems of water seepage at the bottom of the culvert and unreasonable foundation treatment when applying corrugated steel pipe culverts to permafrost regions of plateau railways.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] Provided railway corrugated pipe culverts in permafrost areas, the railway corrugated pipe culverts in permafrost areas include the corrugated pipe culvert body, gravel structural backfill, coarse sand cushion layer, and gravel foundation replacement or short pile foundation;

[0009] The gravel structural backfill is placed around the corrugated steel culvert body.

[0010] For low-temperature stable frozen soil, a coarse sand cushion layer is set below the corrugated steel pipe culvert body, and a gravel foundation replacement is set within the upper limit range of the frozen soil below the coarse sand cushion layer.

[0011] For foundations with seasonally frozen soil or soil containing ice layers and high ground temperature, a coarse sand cushion layer is set below the corrugated steel culvert body, and the short pile foundation is set below the coarse sand cushion layer. The short pile foundation includes a concrete cap and pile foundation below the concrete cap.

[0012] Furthermore, the corrugated steel culvert body is composed of multiple semi-circular corrugated steel plates connected together;

[0013] The semi-circular corrugated steel plates are connected axially via axial joints, and circumferentially via circumferential joints.

[0014] Furthermore, the longitudinal ends of the semi-circular annular corrugated steel plate are respectively provided with circumferentially arranged circumferential U-shaped cavities and circumferentially arranged rectangular hollow square steel. When two axially adjacent semi-circular annular corrugated steel plates are connected, the circumferentially arranged rectangular hollow square steel of one semi-circular annular corrugated steel plate is inserted into the circumferential U-shaped cavity of the other semi-circular annular corrugated steel plate and fixed by axial bolts to form the axial joint.

[0015] Furthermore, an circumferential seal is provided between the circumferential rectangular hollow square steel and the circumferential U-shaped cavity.

[0016] Furthermore, the semi-circular annular corrugated steel plate has axial U-shaped plates at both circumferential ends, with the openings facing downwards. The axial U-shaped plates of the lower semi-circular annular corrugated steel plate are smaller than the axial U-shaped plates of the upper semi-circular annular corrugated steel plate.

[0017] When the semi-circular corrugated steel plates are connected in a circumferential manner, the lower axial U-shaped plate is inserted into the upper axial U-shaped plate and fixed by vertical bolts to form the circumferential joint.

[0018] Furthermore, an axial seal is provided between the upper and lower axial U-shaped plates.

[0019] Furthermore, the height difference between the upper limit of the frozen soil and the bottom of the corrugated steel culvert body is Ht;

[0020] For intermittent runoff culverts, the replacement depth of the intermediate culvert section is 0.5~0.6 Ht, the replacement depth of the transition section is 0.7~0.8 Ht, and the replacement depth of the inlet and outlet sections is 1.1~1.2 Ht.

[0021] For small-run culverts, the replacement depth of the intermediate culvert section is 0.7~0.8 Ht, the replacement depth of the transition section is 0.9~1.0 Ht, and the replacement depth of the inlet and outlet sections is 1.1~1.2 Ht.

[0022] For culverts with long runoff periods and large runoff volumes, the replacement depth for the intermediate culvert section is 1.1~1.2 Ht, the replacement depth for the transition section is 1.3~1.4 Ht, and the replacement depth for the inlet and outlet sections is 1.6~1.8 Ht.

[0023] Furthermore, the concrete cap is located above the upper limit of the frozen soil, and the pile foundation is set downward from above the upper limit of the frozen soil, using inserted piles or crushed stone piles.

[0024] On the other hand, a construction method for railway corrugated steel culverts in permafrost regions is provided, the construction method comprising:

[0025] Depending on the type of frozen soil, the construction may involve gravel foundation replacement or short pile foundation. The short pile foundation includes a concrete cap and the pile foundation below the concrete cap.

[0026] Lay a coarse sand bedding layer;

[0027] The corrugated steel plates are spliced ​​together, first circumferentially and then axially, to obtain the corrugated steel pipe culvert body.

[0028] Use bolts to fasten circumferential and axial joints;

[0029] Backfill the area around the corrugated steel culvert body with sand and gravel.

[0030] Furthermore, the method also includes:

[0031] Eight-shaped wing walls are constructed at the entrance and exit of the corrugated steel pipe culvert.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] This invention provides a corrugated steel pipe culvert for railways in permafrost regions and its construction method. It is constructed by splicing two corrugated steel plates, with the joint designed as a channel shape. U-shaped steel and rectangular steel are welded to both ends of the corrugated steel plates as circumferential joints. Channel steel and steel plates are welded along the axial direction of the corrugated steel plates as axial joints, which are then fastened together with bolts. Sealing elements are filled inside the U-shaped steel and channel steel to increase the contact area of ​​the joint, thereby reducing water seepage and improving the structure's sealing performance.

[0034] In addition, a reasonable foundation treatment scheme was proposed. Based on geological survey data, for low-temperature stable permafrost, when designing according to the principle of maintaining freezing, the soil within the upper limit of the permafrost area was replaced with sand and gravel; for seasonally frozen soil or foundations containing ice layers and with high ground temperature, the design principle of destroying permafrost was adopted, using short pile foundations. This effectively reduces the occurrence of structural defects and ensures the structural safety of the culvert structure when the foundation experiences frost heave and thaw settlement. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of gravel foundation replacement provided in an embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram of a short pile foundation provided in an embodiment of the present invention.

[0038] Figure 3 This is a structural diagram of a corrugated steel culvert provided in an embodiment of the present invention.

[0039] Figure 4 for Figure 3 The transverse cross section I-I in the diagram.

[0040] Figure 5 This is an axial cross-sectional view of the corrugated steel plate structure provided in an embodiment of the present invention.

[0041] Figure 6 for Figure 3 Enlarged diagram of point A in the diagram.

[0042] Figure 7 for Figure 4 Enlarged diagram of point B in the image.

[0043] The diagram is labeled as follows:

[0044] 1-First semi-circular corrugated steel plate, 2-Second semi-circular corrugated steel plate, 3-Coarse sand cushion layer, 4-Structural backfill of gravel, 5-Gravel foundation replacement, 6-Concrete cap, 7-Pile foundation, 8-Circular U-shaped cavity, 9-Circular rectangular hollow steel, 10-Circular seal, 11-First axial U-shaped plate, 12-Second axial U-shaped plate, 13-Axial seal, 14-Bolt, 15-Nut, 16-Five-shaped wing wall. Detailed Implementation

[0045] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0046] In the description of this invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Furthermore, in the description of this invention, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Of course, such terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than those illustrated or described herein.

[0049] It should also be noted that although the order of steps is mentioned in the method description, in some cases, steps may be performed in a different order than that described here, and this should not be interpreted as a restriction on the order of steps.

[0050] In a specific implementation, the length direction of the culvert is defined as the axial direction, the outline direction of the culvert cross section is defined as the circumferential direction, and the direction perpendicular to the ground is defined as the vertical direction.

[0051] This invention provides a corrugated steel pipe culvert for railways in permafrost regions. The culvert body is quickly assembled using corrugated steel plates, and appropriate foundation treatment measures are selected based on the type of permafrost and the water flow conditions of the culvert. This invention provides an optimized culvert structure and construction method with practical significance for the construction of railway culverts in permafrost regions.

[0052] Specifically, the corrugated steel pipe culvert for railways in permafrost regions provided by this invention includes a corrugated steel pipe culvert body, a gravel structural backfill 4, and a coarse sand cushion layer 3. The gravel structural backfill 4 is placed around the corrugated steel pipe culvert body as part of the structural load-bearing structure, and the coarse sand cushion layer 3 is laid at the bottom of the corrugated steel pipe culvert body. Depending on the type of permafrost and the water flow conditions of the culvert, different foundation treatment methods are adopted, such as setting a gravel foundation replacement 5 or a short pile foundation within the foundation below the corrugated steel pipe culvert body.

[0053] like Figure 1 For low-temperature stable frozen soil, the design follows the principle of maintaining freezing. A coarse sand cushion layer 3 is set below the corrugated steel pipe culvert body, and a gravel foundation replacement layer 5 is set within the upper limit of the frozen soil below the coarse sand cushion layer 3. The replacement depth should not exceed 3m; otherwise, a short pile foundation should be used.

[0054] like Figure 2 For foundations with seasonally frozen soil or soil containing ice layers and high ground temperature, the design should be based on the design principle of destroying permafrost. A coarse sand cushion layer 3 is set below the steel corrugated pipe culvert body. Below the coarse sand cushion layer 3 is a short pile foundation, which includes a concrete cap 6 and a pile foundation 7 below the concrete cap 6.

[0055] Regardless of the foundation treatment measures adopted, a coarse sand cushion layer should be laid between the steel corrugated pipe culvert and the ground, and the thickness of the cushion layer should be greater than twice the structural wave height.

[0056] Furthermore, the corrugated steel pipe culvert body provided by the present invention is composed of multiple semi-circular annular corrugated steel plates connected together, wherein the semi-circular annular corrugated steel plates are arc-shaped corrugated plates, such as... Figure 4 The upper part is the first semi-circular corrugated steel plate 1, and the lower part is the second semi-circular corrugated steel plate 2. For example... Figure 3 The semi-circular corrugated steel plates are connected axially via axial joints and circumferentially via circumferential joints, which can effectively reduce the disturbance of water infiltration to the frozen soil foundation.

[0057] Specifically, such as Figure 5 and Figure 6 The semi-circular corrugated steel plate has circumferentially arranged circumferential U-shaped cavities 8 and circumferentially arranged rectangular hollow steel bars 9 at its longitudinal ends. When two axially adjacent semi-circular corrugated steel plates are connected, the circumferentially arranged rectangular hollow steel bar 9 of one semi-circular corrugated steel plate is inserted into the circumferential U-shaped cavity 8 of the other semi-circular corrugated steel plate and fixed by axial bolts 14 to form an axial joint. A circumferential sealing element 10, which can be a rubber gasket, is also provided between the circumferentially arranged rectangular hollow steel bar 9 and the circumferential U-shaped cavity 8.

[0058] like Figure 4 and Figure 7The semi-circular corrugated steel plate has axial U-shaped plates at both ends, with the openings facing downwards. The axial U-shaped plate of the lower semi-circular corrugated steel plate is smaller than that of the upper semi-circular corrugated steel plate. When the semi-circular corrugated steel plates are connected circumferentially, the lower axial U-shaped plate is inserted into the upper axial U-shaped plate and fixed by vertical bolts 14 to form a circumferential joint. An axial sealing element 13, which can be a rubber gasket, is also provided between the upper and lower axial U-shaped plates. This invention reduces water seepage by increasing the contact area of ​​the joint, improving the sealing performance of the structure. At the same time, the circumferential joint can also serve as a stiffening rib, strengthening the circumferential stiffness of the structure and improving its load-bearing capacity.

[0059] When assembling the culvert sections, install them from the middle to both ends. When assembling and closing them along the circumference, measure the cross-sectional shape in time. If it meets the standard, continue assembling. After all the sections are assembled, tighten all bolts with a torque wrench.

[0060] When the foundation is replaced with gravel foundation 5, the thickness of the replacement is flexibly determined by taking into account the law of the natural rise of the upper limit of the frozen soil after the embankment is filled, and the intermediate culvert section, transition section and entrance and exit section are considered separately. The height difference between the upper limit of the frozen soil and the bottom of the corrugated steel pipe culvert body is recorded as Ht. For intermittent runoff culverts, the replacement depth for the intermediate culvert section is 0.5~0.6 Ht, for the transition section it is 0.7~0.8 Ht, and for the inlet and outlet sections it is 1.1~1.2 Ht. For small runoff culverts, the replacement depth for the intermediate culvert section is 0.7~0.8 Ht, for the transition section it is 0.9~1.0 Ht, and for the inlet and outlet sections it is 1.1~1.2 Ht. For culverts with long runoff periods and large runoff volumes, the replacement depth for the intermediate culvert section is 1.1~1.2 Ht, for the transition section it is 1.3~1.4 Ht, and for the inlet and outlet sections it is 1.6~1.8 Ht.

[0061] The filling of the structure must be carried out synchronously and symmetrically on both sides of the culvert, and layered filling and compaction should be adopted. The next layer of filling can only be carried out after the compaction degree meets the requirements.

[0062] When a short pile foundation is used, the concrete cap 6 is located above the upper limit of the frozen soil layer. The disturbance to the frozen soil layer should be minimized. The pile foundation 7 is set from above the upper limit of the frozen soil layer downwards, using inserted piles or crushed stone piles to prevent the frozen soil from melting due to the heat of hydration of the concrete.

[0063] After the foundation pit is excavated, it should be sealed in a timely manner to reduce the exposure time of the foundation pit and prevent the permafrost layer from being disturbed by surface solar radiation, human activities, etc.

[0064] The construction method for the aforementioned railway corrugated pipe culverts in permafrost areas specifically includes the following steps:

[0065] S1: Depending on the type of frozen soil, construct either a gravel foundation replacement 5 or a short pile foundation. The short pile foundation includes a concrete cap 6 and the pile foundation 7 beneath the concrete cap 6.

[0066] S2: Lay a coarse sand bedding layer 3.

[0067] S3: Splice semi-circular corrugated steel plates, first connect them circumferentially, then connect them axially to obtain the corrugated steel pipe culvert body.

[0068] S4: Use bolt 14 to fasten the circumferential joint and the axial joint.

[0069] S5: Backfill the area around the corrugated steel culvert body with sand and gravel.

[0070] S6: Construct a herringbone wing wall 16 at the entrance and exit of the corrugated steel pipe culvert.

[0071] Example:

[0072] 1) Construction preparation: Before construction, the site should be re-inspected to ensure that temporary construction facilities, material storage, acceptance of construction machinery and equipment, and calibration of testing instruments meet the requirements.

[0073] 2) Loading, unloading and transportation: During loading, unloading and transportation, measures should be taken to avoid damage to the surface coating of the corrugated steel sheet. For areas where the coating has peeled off or where welding was performed after galvanizing, the surface attachments should be removed and repaired.

[0074] 3) Foundation treatment: Depending on the type of frozen soil, gravel replacement or short pile foundation shall be selected. During construction, the soil foundation pit excavated to the specified elevation shall not be exposed, disturbed or soaked for a long time. Once the requirements are met, pipe foundation filling or foundation construction shall be carried out immediately.

[0075] 4) Subbase construction: A layer of coarse sand is laid between the foundation and the corrugated steel pipe. The thickness of the subbase shall not be less than twice the wave height to ensure that the soil and steel structure can be well stressed together.

[0076] 5) Segment installation: The structural assembly should ensure the cross-sectional shape. After the first segment is assembled, the cross-sectional shape should be measured once. The cross-sectional shape should be measured once every 4 segments assembled thereafter. If the standard is met, the assembly can continue. If the standard is not met, adjustments should be made in time.

[0077] 6) Bolt tightening should be carried out according to the design requirements for initial and final tightening, and all bolts should be tightened with equal torque. After the steel plates are assembled, the bolt torque should be checked. The number of bolts whose torque does not meet the requirements should not exceed 10% of the total number of bolts checked. Otherwise, all bolts should be rechecked to ensure that the torque values ​​meet the requirements.

[0078] 7) Structural backfill: Backfilling construction of corrugated steel pipe culverts can be divided into embankment method and trench backfilling method. Regardless of which method is used, the minimum width of the structural backfill should be guaranteed to ensure the stress of the corrugated steel pipe culvert.

[0079] 8) Backfilling and compaction:

[0080] A. During the backfilling and compaction process, before the minimum backfill thickness is reached, it is strictly forbidden for any vehicles or machinery to operate on top of it. When using a road roller for roadbed construction compaction, vibration impact compaction shall not be used within a range of not less than 1 pipe diameter on both sides of the culvert.

[0081] B. Structural backfilling should be carried out in layers, horizontally and symmetrically, with a compaction thickness not exceeding 200mm. Backfilling should be carried out simultaneously on both sides of the structure, with the height difference between the two sides not exceeding 200mm, and structural deformation should be closely monitored.

[0082] C. The filler in the wedge-shaped area should be compacted tightly with the structure. This can be done manually or by watertight method, and compacted with a vibrator.

[0083] D. For backfill compaction on the sides of the culvert, the compaction equipment should move along the longitudinal axis of the culvert. It is strictly forbidden to shovel or dump the material perpendicular to the culvert body. For backfill compaction on the top surface of the culvert, it should be carried out perpendicular to the length of the culvert.

[0084] E. For culverts with end walls, the backfilling sequence should proceed from the end walls toward the center; for culverts without end walls, the backfilling sequence should proceed from the center toward both ends.

[0085] F. During the backfilling process, the shape change of the cross-section should be monitored in stages, and the cross-section deformation in any direction should not exceed 2%. If the deformation is found to exceed the allowable value, construction should be stopped immediately, the cause should be identified, and the backfilling and compaction methods should be corrected to reduce the deformation to the specified range.

[0086] The structure of this invention uses fewer bolts, enabling rapid construction and reducing labor intensity, thus offering significant technical advantages in construction. Simultaneously, the axial and circumferential joints with special structures on the culvert provide excellent sealing, reducing water infiltration and contributing to the stability of the permafrost foundation. Most importantly, different foundation structures are adopted according to different types of permafrost, exhibiting strong adaptability to foundation deformation and reducing the occurrence of structural defects.

[0087] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A corrugated steel culvert for railways in permafrost regions, characterized in that: The railway corrugated pipe culvert in the frozen soil area includes the corrugated pipe culvert body, gravel structural backfill (4), coarse sand cushion layer (3), and gravel foundation replacement (5) or short pile foundation. The gravel structural backfill (4) is set around the corrugated steel culvert body; For low-temperature stable frozen soil, the coarse sand cushion layer (3) is set below the corrugated steel pipe culvert body, and the gravel foundation replacement (5) is set within the upper limit range of the frozen soil below the coarse sand cushion layer (3). For foundations with seasonal frozen soil or soil ice layer and high ground temperature, the coarse sand cushion layer (3) is set below the steel corrugated pipe culvert body, and the short pile foundation is below the coarse sand cushion layer (3). The short pile foundation includes a concrete cap (6) and a pile foundation (7) below the concrete cap (6). The corrugated steel pipe culvert body is composed of multiple semi-circular corrugated steel plates connected together. The semi-circular annular corrugated steel plates are connected axially via axial joints, and circumferentially via circumferential joints. The longitudinal ends of the semi-circular annular corrugated steel plate are respectively provided with a circumferentially arranged circumferential U-shaped cavity (8) and a circumferentially arranged rectangular hollow square steel (9). When two axially adjacent semi-circular annular corrugated steel plates are connected, the circumferentially arranged rectangular hollow square steel (9) of one semi-circular annular corrugated steel plate is inserted into the circumferential U-shaped cavity (8) of the other semi-circular annular corrugated steel plate and fixed by axial bolts (14) to form the axial joint.

2. The corrugated steel pipe culvert for railways in permafrost areas according to claim 1, characterized in that: An annular seal (10) is provided between the annular rectangular hollow square steel (9) and the annular U-shaped cavity (8).

3. The steel corrugated pipe culvert for railways in permafrost areas according to claim 2, characterized in that: The semi-circular corrugated steel plate has axial U-shaped plates at both ends of its circumferential direction, with the openings facing downwards. The axial U-shaped plate of the lower semi-circular corrugated steel plate is smaller than the axial U-shaped plate of the upper semi-circular corrugated steel plate. When the semi-circular corrugated steel plates are connected in a circumferential manner, the lower axial U-shaped plate is inserted into the upper axial U-shaped plate and fixed by vertical bolts (14) to form the circumferential joint.

4. The steel corrugated pipe culvert for railways in permafrost areas according to claim 3, characterized in that: An axial seal (13) is provided between the upper and lower axial U-shaped plates.

5. The corrugated steel culvert for railways in permafrost regions according to claim 1, characterized in that: The height difference between the upper limit of the frozen soil and the bottom of the corrugated steel culvert body is Ht; For intermittent runoff culverts, the replacement depth of the intermediate culvert section is 0.5~0.6 Ht, the replacement depth of the transition section is 0.7~0.8 Ht, and the replacement depth of the inlet and outlet sections is 1.1~1.2 Ht. For small-run culverts, the replacement depth of the intermediate culvert section is 0.7~0.8 Ht, the replacement depth of the transition section is 0.9~1.0 Ht, and the replacement depth of the inlet and outlet sections is 1.1~1.2 Ht. For culverts with long runoff periods and large runoff volumes, the replacement depth for the intermediate culvert section is 1.1~1.2 Ht, the replacement depth for the transition section is 1.3~1.4 Ht, and the replacement depth for the inlet and outlet sections is 1.6~1.8 Ht.

6. The corrugated steel culvert for railways in permafrost regions according to claim 1, characterized in that: The concrete cap (6) is located above the upper limit of the frozen soil, and the pile foundation (7) is set downward from above the upper limit of the frozen soil, using inserted piles or crushed stone piles.

7. The construction method for railway corrugated pipe culverts in frozen soil areas according to claim 1, characterized in that: The construction method includes: Depending on the type of frozen soil, the construction may be carried out using gravel foundation replacement (5) or short pile foundation. The short pile foundation includes a concrete cap (6) and a pile foundation (7) below the concrete cap (6). Lay a coarse sand cushion layer (3); The corrugated steel plates are spliced ​​together, first circumferentially and then axially, to obtain the corrugated steel pipe culvert body. Use bolts (14) to fasten the circumferential joint and the axial joint; Backfill the area around the corrugated steel culvert body with sand and gravel.

8. The construction method for railway corrugated pipe culverts in permafrost areas according to claim 7, characterized in that: The method further includes: Construct wing walls (16) at the entrance and exit of the corrugated steel pipe culvert.

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