Foundation bed bottom layer assembly type blind ditch suitable for frozen soil roadbed

Abstract

The utility model discloses a foundation bed bottom layer assembly type blind ditch suitable for a frozen soil roadbed, which comprises a base, one side of the base contacted with a frozen soil base layer is ellipsoidal, and the base extends along the direction of the frozen soil base layer; a drainage pipe embedded in the axial direction of the base is arranged on the other side of the base; drainage holes and a supporting framework are arranged on the surface of the side, not in contact with the base, of the drainage pipe, and the supporting framework is used for supporting geotechnical cloth; the geotechnical cloth covers the base, and a space is formed by the geotechnical cloth and the base and used for draining and filtering; according to the design of the ellipsoidal base, damage of frost heaving to the blind ditch structure can be reduced to the maximum extent.

Description

Technical Field

[0001] The utility model belongs to the field of drainage measures for frozen soil roadbeds, and in particular relates to an assembled blind ditch for the bottom layer of a base bed suitable for frozen soil roadbeds. Background Art

[0002] Frozen roadbed refers to the roadbed built in frozen soil areas, which involves engineering issues of road construction on permafrost or seasonally frozen soil. Frozen soil is a special type of soil that contains ice under low temperature conditions, so it has different physical and mechanical properties from ordinary soil. The construction and maintenance of frozen soil roadbeds face some special challenges, including frost heave and freeze-thaw of frozen soil.

[0003] The deformation phenomenon induced by frost heave and freeze-thaw cycles is the most significant. This deformation phenomenon lurks deep in the roadbed and may cause serious safety hazards and engineering diseases at any time. Taking the roadbed ditch as an example, the volume of frozen soil will change significantly during the freeze-thaw process, causing the ditch to be pushed out of the roadbed. When summer comes, due to cracks or damage between the ditch and the roadbed, rainwater will not be able to be discharged in time, and will infiltrate into the roadbed and the lower soil. When the next winter comes, it will induce more serious frost heave diseases.

[0004] At present, in order to meet the drainage needs of the lower frozen soil, the existing technology is to set up blind ditches, but the cross-section of the existing common blind ditches is not very reasonable. The main problem is that the traditional rectangular cross-section is prone to stress concentration at the corners. The rectangular blind ditch made of concrete is easily damaged by the squeezing of frozen soil and has a short service life. Therefore, there is an urgent need for an assembled blind ditch suitable for the bottom layer of the base of frozen soil roadbed. Utility Model Content

[0005] In order to solve the unreasonable form of blind ditches in the prior art and the derivative problems caused by frost heave and freeze-thaw on frozen soil roadbeds, the utility model provides an assembled blind ditch for the base bed bottom layer of frozen soil roadbeds. The drainage system formed by the blind ditch provided by the utility model greatly improves the drainage efficiency, can minimize the impact of freeze-thaw cycles, and effectively cope with frost heave. The technical solution of the utility model is reviewed below.

[0006] An assembled blind ditch suitable for the bottom layer of a base bed of a frozen soil roadbed is characterized in that it includes an ellipsoidal base on one side that contacts the frozen soil base layer, and the base extends along the direction of the frozen soil base layer; a drainage pipe embedded along the axial direction of the base is provided on the other side of the base; a drainage hole and a support frame are provided on the surface of the side of the drainage pipe that does not contact the base, and the support frame is used to support a geotextile; the geotextile is covered on top of the base, and the geotextile and the base form a space for drainage and filtration.

[0007] Preferably, a groove cooperating with a drainage pipe is provided on the side of the base that is not in contact with the frozen soil base.

[0008] Preferably, the supporting framework comprises three brackets.

[0009] Preferably, the brackets are evenly spaced and distributed on a side of the drain pipe that does not contact the groove.

[0010] Preferably, the drainage hole is plum blossom-shaped.

[0011] A drainage system comprises a frozen soil base layer, a replacement base layer, a replacement surface layer, a coarse sand belt, a blind ditch, a concrete side ditch and a stepped side ditch; the replacement surface layer is provided with a stepped side ditch, and a concrete side ditch is provided in the slope extension direction of the stepped side ditch; the lower part of the concrete side ditch extends to the replacement base layer; a coarse sand belt is provided between the replacement base layer and the frozen soil base layer; a blind ditch corresponding to the concrete side ditch is provided in the frozen soil base layer, and the top of the blind ditch is covered with a gravel filter bag.

[0012] Preferably, a buffer step is provided at the top of the stepped side ditch, and a small bluestone strip is provided on the buffer step to prevent step erosion.

[0013] Preferably, a thin concrete wall is provided in the drainage direction of the coarse sand belt and the replacement base layer to block water.

[0014] Preferably, the sand and gravel filter bag is covered on the geotextile of the blind ditch.

[0015] Preferably, the small bluestone strips are evenly spaced and distributed on the side of the two-layer stepped side ditches that does not contact the replacement base layer.

[0016] Compared with the prior art, the utility model has the following technical effects:

[0017] (1) The blind ditch provided by the utility model adopts an ellipsoidal bottom surface design, which is a refined arc design based on the specific properties of frozen soil. It can effectively cope with frost heave deformation and aims to minimize the damage of frost heave to the blind ditch structure.

[0018] (2) The drainage system formed by the assembled blind ditch provided by the utility model can prevent the influence of freeze-thaw cycles on the drainage system to the greatest extent, ensuring the stability and durability of the drainage function. It not only improves the drainage efficiency, but also significantly enhances the anti-frost heave performance of the structure, providing a beneficial effect on the safety and stability of road engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of the assembled blind ditch and a schematic diagram of the drainage pipe in Example 1 of the utility model.

[0020] Figure 2 This is a schematic cross-sectional structure diagram of a drainage system consisting of an assembled blind ditch in Example 1 of the utility model.

[0021] In the figure:

[0022] 1. Base; 2. Drain pipe; 3. Support frame; 4. Geotextile; 5. Drain hole; 7. Blind ditch;

[0023] 8. Sand and gravel filter bag; 9. Frozen soil base; 10. Replacement base; 11. Groove; 20. Replacement base;

[0024] 30. Buffer step; 31. Bracket; 40. Coarse sand belt; 50. Concrete thin wall; 60. Concrete ditch;

[0025] 70. Small bluestone strips; 80. Stepped side ditches. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be the usual meanings understood by people with general skills in the field to which the present disclosure belongs. The words "including" or "comprising" and the like used in the present disclosure mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] The following is combined with Figure 1-2 The utility model is further described with examples:

[0028] like Figure 1As shown, an assembled blind ditch suitable for the bottom layer of the base of a frozen soil roadbed comprises a base 1, a drainage pipe 2, a supporting frame 3, a geotextile 4, and a drainage hole 5. The side of the base 1 in contact with the frozen soil base 9 is ellipsoidal, and the ellipsoidal base can effectively solve the damage to the blind ditch 7 structure caused by frost heave; the base 1 extends along the direction of the frozen soil base 9; the other side of the base 1 is provided with a drainage pipe 2 embedded along the axial direction of the base 1, and the side of the base 1 not in contact with the frozen soil base 9 is provided with a groove 11 cooperating with the drainage pipe 2; the surface of the side of the drainage pipe 2 not in contact with the base 1 is provided with drainage holes 5 and The support frame 3 has a plum blossom-shaped drainage hole 5, and the upper half of the drainage pipe 2 is a drainage hole 5 with a drainage function. The support frame 3 includes three brackets 31, and the support frame 3 is made of PVC material. The brackets 31 are evenly spaced and distributed on the side of the drainage pipe 2 that is not in contact with the groove 11; the support frame 3 is used to support the geotextile 4; the geotextile 4 is covered on the base 1, and the geotextile 4 and the base 1 form a drainage space for drainage and filtration. Water penetrates from the geotextile 4 into the drainage space to achieve drainage, and the ellipsoidal shape of the base 1 can solve the frost heave problem caused by frozen soil.

[0029] like Figure 2 As shown, a drainage system includes a frozen soil base layer 9, a replacement base layer 10, a replacement surface layer 20, a coarse sand belt 40, a blind ditch 7, a concrete side ditch 60 and a stepped side ditch 80; the replacement surface layer 20 is provided with a stepped side ditch 80, the top of the stepped side ditch 80 is provided with a buffer step 30, and the buffer step 30 is provided with a small bluestone strip 70, and the small bluestone strip 70 is used to prevent step erosion when water passes through the buffer step 30; the slope extension direction of the stepped side ditch 80 is provided with a concrete side ditch 60; the lower part of the concrete side ditch 60 extends to the replacement base layer 10; the replacement base A coarse sand belt 40 is provided between the layer 10 and the frozen soil base layer 9; a thin concrete wall 50 is provided in the drainage direction of the coarse sand belt 40 and the replacement base layer 10 to prevent the seeping water; a blind ditch 7 corresponding to the concrete side ditch 60 is provided in the frozen soil base layer 9, and the top of the blind ditch 7 is covered with a gravel filter bag 8, and the gravel filter bag 8 is covered on the geotextile 4 of the blind ditch 7. There are two blind ditches 7, and they are arranged in a separated manner. The distance between the two blind ditches 7 corresponds to the two concrete side ditches 60, so that the two groups of blind ditches 7 arranged in a separated manner can prevent the influence of freeze-thaw to the greatest extent.

[0030] The utility model provides an assembled blind ditch suitable for the base bed bottom layer of a frozen soil roadbed. The ellipsoidal design of the blind ditch can cope with the extrusion external force caused by frost heave, greatly reducing the damage of frost heave to the blind ditch structure. The drainage system of the assembled blind ditch adopts a separated two-group design, which not only occupies a smaller vertical space, but also can greatly prevent the influence of freeze-thaw cycle problems on the drainage system, ensuring the stability and durability of the drainage function; it also enhances the anti-frost heave function of the structure, and improves the safety and stability of road engineering.

Claims

1. An assembled blind ditch for the bottom layer of the subgrade suitable for frozen soil roadbed, characterized in that: The invention comprises a base (1) having an ellipsoidal shape on one side in contact with a frozen soil base layer (9), the base (1) extending in the direction of the frozen soil base layer (9); a drainage pipe (2) embedded in the axial direction of the base (1) is provided on the other side of the base (1); a drainage hole (5) and a support frame (3) are provided on the surface of the drainage pipe (2) not in contact with the base (1), the support frame (3) being used to support a geotextile (4); the geotextile (4) is covered on the top of the base (1), and the geotextile (4) and the base (1) form a space for drainage and filtration.

2. The assembled blind ditch for the bottom layer of the subgrade suitable for frozen soil roadbed according to claim 1 is characterized in that: A groove (11) that cooperates with the drainage pipe (2) is provided on the side of the base (1) that does not contact the frozen soil base layer (9).

3. The assembled blind ditch for the subgrade bottom layer of frozen soil roadbed according to claim 1 is characterized in that: The supporting frame (3) comprises three brackets (31).

4. The assembled blind ditch for the bottom layer of the subgrade suitable for frozen soil roadbed according to claim 3 is characterized in that: The brackets (31) are evenly spaced and distributed on the side of the drain pipe (2) that is not in contact with the groove (11).

5. The assembled blind ditch for the bottom layer of the subgrade suitable for frozen soil roadbed according to claim 1 is characterized in that: The drainage hole (5) is in the shape of a plum blossom.

6. A drainage system formed by the blind ditch according to any one of claims 1 to 5, characterized in that: The invention comprises a frozen soil base (9), a replacement base (10), a replacement surface layer (20), a coarse sand belt (40), a blind ditch (7), a concrete side ditch (60) and a stepped side ditch (80); the replacement surface layer (20) is provided with a stepped side ditch (80), and a concrete side ditch (60) is provided in the slope extension direction of the stepped side ditch (80); the lower part of the concrete side ditch (60) extends to the replacement base (10); a coarse sand belt (40) is provided between the replacement base (10) and the frozen soil base (9); a blind ditch (7) corresponding to the concrete side ditch (60) is provided in the frozen soil base (9), and a gravel filter bag (8) is covered on the top of the blind ditch (7).

7. The drainage system of the assembled blind ditch in the subgrade of frozen soil roadbed according to claim 6, characterized in that: A buffer step (30) is provided at the top of the stepped side ditch (80), and a small bluestone strip (70) is provided on the buffer step (30) to prevent step erosion.

8. The drainage system of the assembled blind ditch in the bottom layer of the subgrade suitable for frozen soil roadbed according to claim 6, characterized in that: A thin concrete wall (50) is provided in the drainage direction of the coarse sand belt (40) and the replacement base layer (10) to block water.

9. The drainage system of the assembled blind ditch in the bottom layer of the subgrade suitable for frozen soil roadbed according to claim 6, characterized in that: The sand and gravel filter bag (8) is covered on the geotextile (4) of the blind ditch (7).

10. The drainage system of the assembled blind ditch in the bottom layer of the subgrade suitable for frozen soil roadbed according to claim 7, characterized in that: The small bluestone strips (70) are evenly distributed at intervals on the side of the two-layer stepped side ditch (80) that is not in contact with the replacement base layer (10).

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