Roadbed reinforcing drainage structure, steep slope semi-excavation semi-filling roadbed and construction method thereof

Abstract

The application relates to the field of highway engineering construction, and discloses a roadbed reinforcing drainage structure, a steep slope semi-excavation semi-filling roadbed and a construction method thereof. In the process of constructing the steep slope roadbed, the implantation section of the triangular pipe is implanted into the drill hole formed in the mountain body after the mountain body is excavated; the drainage section of the triangular pipe is integrally formed with the part of the mountain body of the roadbed after being well treated for corrosion. The implantation section of the triangular pipe serves as a fulcrum and jointly supports the roadbed above the drainage section and the weight of the vehicle together with the drainage section, so that the uneven settlement of the road surface close to the mountain body and the outer road surface, the road surface cracking and even the overall lateral sliding of the road are prevented. Since the pipe wall of the drainage section is provided with a circular hole and a filtering device, the filtering device is used to block the silt, the water permeating into the roadbed is filtered into the triangular pipe, the water collected by the column filtering device can be efficiently discharged by the slope of the triangular pipe, the dryness of the roadbed and the triangular pipe is maintained, and the road diseases caused by the permeated water are prevented.

Description

Technical Field

[0001] This invention relates to the field of highway engineering construction, specifically to roadbed reinforcement and drainage structures, steep slope semi-cut and semi-fill roadbeds and their construction methods. Background Technology

[0002] Steep slope high fill embankments refer to semi-cut and semi-fill high fill embankments with a slope height exceeding 20m and a ground slope ratio steeper than 1:2.5. Semi-cut and semi-fill steep slope high fill embankments often suffer from numerous defects during construction and after completion, which are difficult to treat and frequently incur high costs. Common defects include: uneven embankment settlement causing longitudinal and transverse cracks in the pavement, overall subsidence, or localized settlement; embankment sliding or slope collapse. Summary of the Invention

[0003] To address the aforementioned shortcomings of existing technologies, this paper provides a roadbed reinforcement and drainage structure, a steep slope semi-cut and semi-fill roadbed and its construction methods, which not only reduce pavement damage but also improve the lateral drainage function of the roadbed.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0005] A roadbed reinforcement and drainage structure, characterized by: a triangular pipe with a triangular cross-section and a horizontally arranged bottom surface; a centrally located interior section; and a submerged section and a drainage section. The submerged section gradually thickens from the outer end of the drainage section to the outer end of the submerged section. The submerged section has a smooth, non-porous surface and a thick bottom, the thickness of which is determined by the shear force borne by the submerged section. Several regular through-holes are staggered on both sides of the drainage section, and cylindrical filter devices are detachably connected within these holes. The submerged section is inserted into a borehole in the side wall of the steep slope road, and structural adhesive is filled between the borehole and the submerged section. The drainage section of the submerged section passes through the roadbed at the steep slope and integrates with the roadbed.

[0006] According to the above technical solution, the inner wall of the circular hole in the drainage section and the connection between the cylindrical filter device are made of rubber with moderate hardness.

[0007] According to the above technical solution, the cross-section of the triangular tube is an isosceles triangle.

[0008] The steep slope semi-cut and semi-fill roadbed includes the mountain body. An excavation area is set on the mountain body, and the excavation area is divided into a lower stepped fill area, a middle flat fill area and an upper excavation area. Stone and soil are backfilled in the lower stepped fill area and the middle flat fill area to form the roadbed.

[0009] Its features include: adopting the roadbed reinforcement and drainage structure as described above, drilling one or more layers of holes on the mountain in the lower stepped fill area, fixing the insertion section of the triangular pipe in the drill hole with structural adhesive, and forming one or more layers of triangular pipe in the backfill stone and rammed earth in the lower stepped fill area.

[0010] According to the above technical solution, the inclination angle of the borehole is no greater than 2°; the side length of the insertion section of the triangular tube is L, the radius of the circumscribed circle of the cross section is N, the inner diameter of the borehole is N+2mm~N+6mm, and the depth of the borehole is no less than 1 / 3L, or the depth of the borehole is calculated based on the torque bearing capacity of the triangular tube and then implanted into the mountain body.

[0011] According to the above technical solution, in the lower stepped fill area, geogrids are installed between the backfill stones and soil of each step.

[0012] According to the above technical solution, an anti-slide structure is provided at the bottom of the lower stepped fill area; if groundwater exists in the construction area, a water-intercepting gravel blind ditch is provided at the junction of the lower stepped fill area and the middle planar fill area; and a drainage ditch is provided between the middle planar fill area and the upper excavation area.

[0013] A method for constructing a roadbed with a steep slope using a combination of excavation and filling, characterized by the following steps:

[0014] S1: Construction to be carried out in the excavated area;

[0015] S2: Mark the drilling locations on the hillside in the lower stepped fill area;

[0016] S3: The stepped fill area below the borehole is filled in a stepped layered manner, with geogrids arranged in each layer.

[0017] S4: Drill holes, inject structural adhesive and insert triangular conduits, and complete the construction of supporting measures for the triangular conduits;

[0018] S5: Continue backfilling with stones and soil above the triangular pipe until the height is consistent with the backfilled stones and soil in the central flat fill area, and then proceed with road construction.

[0019] According to the above technical solution, step S4 is divided into the following steps:

[0020] S41: During the drilling process, debris should be removed frequently;

[0021] S42: After drilling is completed, use an air compressor and a test tube brush for rinsing;

[0022] S43: Use Grade A structural adhesive, mix it according to the specified ratio, and inject it into the drilled hole. The amount injected must be sufficient to fill the drilled hole with structural adhesive after the triangular tube is inserted.

[0023] According to the above technical solution, in step S43, surface rust removal treatment is required before implanting the triangular tube; during the implantation of the triangular tube, the air brought in by the triangular tube needs to be discharged; after implantation of the triangular tube, curing and anti-corrosion treatment are required.

[0024] The present invention has the following beneficial effects:

[0025] During the construction of steep slope roadbed, the insertion section (the smooth and thick end) of the triangular pipe is inserted into the drilled hole inside the mountain after the mountain is excavated, using structural adhesive; the drainage section of the triangular pipe is treated with anti-corrosion measures and then integrated with the roadbed and mountain.

[0026] The insertion section of the triangular conduit acts as a fulcrum, working in conjunction with the drainage section to support the weight of the roadbed and vehicles above it. This prevents uneven settlement between the road surface near the mountain and the outer road surface, road cracking, and even overall road slippage. The triangular cross-section design of the triangular conduit effectively ensures that it will not deform, providing better stability. The through-hole design of the triangular conduit strengthens the roadbed while reducing its own weight, and the thickened wall of the insertion section has sufficient strength to withstand the shear force generated between the mountain and the road. In addition, the drainage section has circular holes in its wall with a filter device, which blocks silt and filters water that has seeped into the roadbed into the triangular conduit. The gradually thickening bottom of the triangular conduit and its slope efficiently drain the water collected by the column filter device, keeping the roadbed and itself dry and preventing the accumulation of water that has seeped into the roadbed, which can cause softening of the roadbed and lead to local collapse or road cracking. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the triangular tube structure provided in an embodiment of the present invention;

[0028] Figure 2 This is a side view of the triangular tube in the thinner direction according to an embodiment of the present invention;

[0029] Figure 3 This is a side view of the triangular tube in the thicker direction according to an embodiment of the present invention;

[0030] Figure 4 This is a front view of the triangular tube provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the use of the triangular conduit in the roadbed according to an embodiment of the present invention;

[0032] In the diagram, 1. Triangular pipe; 1-1. Implantation section; 1-2. Drainage section; 1-3. Circular hole; 2. Mountain; 3. Stepped fill area; 4. Planar fill area; 5. Excavation area; 6. Anti-slide structure; 7. Intercepting gravel blind ditch; 8. Drainage ditch. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Reference Figures 1-2 As shown, the present invention provides a roadbed reinforcement and drainage structure.

[0035] The system includes a triangular pipe 1, which has a triangular cross-section with a horizontally arranged bottom surface (i.e., the surface corresponding to the base of the triangle). The triangular pipe has a central through-hole and is divided into an insertion section 1-1 and a drainage section 1-2. The bottom surface of the triangular pipe gradually thickens from the outer end of the drainage section to the outer end of the insertion section. The insertion section has a smooth, non-porous surface and a thick bottom, the thickness of which is determined by the shear force borne by the triangular pipe. Several through-holes 1-3 are staggered on both sides of the drainage section, and cylindrical filter devices are detachably connected within these holes. The insertion section of the triangular pipe is inserted into a borehole in the side wall of the steep slope road, and structural adhesive is filled between the borehole and the insertion section. The drainage section of the triangular pipe passes through the roadbed at the steep slope and integrates with it. Aggregate gravel is filled around the perimeter of the triangular pipe.

[0036] During the construction of steep slope roadbed, the insertion section (the smooth and thick end) of the triangular pipe is inserted into the drilled hole inside the mountain after the mountain is excavated, using structural adhesive; the drainage section of the triangular pipe is treated with anti-corrosion measures and then integrated with the roadbed and mountain.

[0037] The insertion section of the triangular conduit acts as a fulcrum, working in conjunction with the drainage section to support the weight of the roadbed and vehicles above it. This prevents uneven settlement between the road surface near the mountain and the outer road surface, road cracking, and even overall road slippage. The triangular cross-section design of the triangular conduit effectively ensures that it will not deform, providing better stability. The through-hole design of the triangular conduit strengthens the roadbed while reducing its own weight, and the thickened wall of the insertion section has sufficient strength to withstand the shear force generated between the mountain and the road. In addition, the drainage section has circular holes in its wall with a filter device, which blocks silt and filters water that has seeped into the roadbed into the triangular conduit. The gradually thickening bottom of the triangular conduit and its slope efficiently drain the water collected by the column filter device, keeping the roadbed and itself dry and preventing the accumulation of water that has seeped into the roadbed, which can cause softening of the roadbed and lead to local collapse or road cracking.

[0038] In some of the above embodiments, preferably, the inner wall of the circular hole in the drainage section and the connection point with the cylindrical filter device are made of rubber with moderate hardness, which allows the filter device to better fit the circular hole and prevents sediment from entering the pipe body through the connection point and causing blockage. The cylindrical filter device itself has a very strong filtration effect. The filter device in the triangular pipe is replaceable, and the water filtration function will not be affected by sediment blockage due to prolonged use.

[0039] In some of the above embodiments, preferably, the cross-section of the triangular tube is an isosceles triangle, and more preferably, an equilateral triangle.

[0040] The present invention also provides a steep slope semi-cut and semi-fill roadbed, including a mountain body 2, an excavation area is set on the mountain body, the excavation area is divided into a lower stepped fill area 3, a middle flat fill area 4 and an upper excavation area 5, and stone and soil are backfilled in the lower stepped fill area and the middle flat fill area to form a roadbed.

[0041] Using the roadbed reinforcement and drainage structure described above, one or more boreholes are drilled on the mountainside in the lower stepped fill area. The insertion section of the triangular pipe is fixed in the borehole with structural adhesive, forming one or more triangular pipe layers in the backfill stone and rammed earth in the lower stepped fill area.

[0042] In this embodiment, by laying one or more triangular pipe layers on the mountainside in the lower stepped fill area, not only can the backfill stones and soil in the stepped fill area be effectively supported, preventing uneven settlement of the road surface near the mountainside and the outer road surface, road surface cracking, or even the entire road sliding to the side, but also the water that seeps into the backfill stones and soil in the stepped fill area can be drained in time, keeping the roadbed and itself dry, and preventing the accumulation of water that seeps into the roadbed from causing the roadbed to soften, resulting in local collapse or road surface cracking and other road defects.

[0043] In the above embodiments, the inclination angle of the borehole is no greater than 2°. Preferably, the borehole is driven horizontally into the mountain. The side length of the insertion section of the triangular tube is L, the radius of the circumscribed circle of the cross section is N, the inner diameter of the borehole is N+2mm to N+6mm (N+4mm is selected in the embodiment shown in the figure), and the depth of the borehole is no less than 1 / 3L. Alternatively, the depth of the borehole can be calculated based on the torque bearing capacity of the triangular tube and the corresponding depth of implantation into the mountain.

[0044] In the above embodiment, in order to improve the backfill quality of the backfill stone and soil in the lower stepped fill area, geogrids are arranged between the backfill stone and soil of each step in the lower stepped fill area.

[0045] In the above embodiment, an anti-slide structure 6 is provided at the bottom of the lower stepped fill area; if groundwater exists in the construction area, a water-intercepting gravel blind ditch 7 is provided at the junction of the lower stepped fill area and the middle planar fill area; and a drainage ditch 8 is provided between the middle planar fill area and the upper excavation area.

[0046] This invention also provides a method for constructing a steep slope roadbed using a combination of excavation and filling, comprising the following steps:

[0047] S1: Construction to be carried out in the excavated area;

[0048] S2: Mark the drilling locations on the hillside in the lower stepped fill area;

[0049] S3: The stepped fill area below the borehole is filled in a stepped layered manner, with geogrids arranged in each layer.

[0050] S4: Drill holes, inject structural adhesive and insert triangular conduits, and complete the construction of supporting measures for the triangular conduits;

[0051] S5: Continue backfilling with stones and soil above the triangular pipe until the height is consistent with the backfilled stones and soil in the central flat fill area, and then proceed with road construction.

[0052] In the above embodiment, step S4 consists of the following steps:

[0053] S41: During the drilling process, ash and debris will accumulate in the hole, especially when drilling downwards. The ash and debris are not easy to escape and should be cleaned frequently, otherwise the drilling machine and drill bit will be burned out.

[0054] S42: After drilling is completed, use an air compressor and a test tube brush to flush the hole and remove dust from the hole during the drilling process.

[0055] S43: Use Grade A structural adhesive (this adhesive is a two-component compound, A:B = 4:1 (by weight)). Mix the adhesive according to the specified ratio and then inject it into the drilled hole. The injection volume must ensure that the structural adhesive fills the drilled hole after the triangular guide is inserted (generally, inject to 1 / 2 of the hole depth). In step S43, the preparation, injection, and insertion of the reinforcing bar must be carried out continuously in an assembly line. The prepared adhesive must be used within 30 minutes to prevent it from solidifying.

[0056] In the above embodiment, in step S43, surface rust removal treatment is required before implanting the triangular tube; during the implantation of the triangular tube, the air brought in by the triangular tube needs to be discharged; after implantation of the triangular tube, curing and anti-corrosion treatment are required.

[0057] Step S34 specifically involves: (1) Surface treatment of the triangular tube, using an electric wire brush or a manual wire brush to remove rust from the surface of the triangular tube.

[0058] (2) Insert the prepared tee pipe into the drilled hole that has been filled with structural adhesive:

[0059] Manual insertion method: After drilling horizontally and vertically, insert the steel bar into the hole. Due to the certain concentration of structural adhesive, it is generally not possible to insert it all the way in one go. Use a hammer to hit the other side until the triangular tube is all the way in (Note: there will be rebound after inserting it all the way in, which should be prevented).

[0060] (3) Remove air. During the implantation of the triangular tube, air will be introduced into the hole. Measures should be taken to remove the air and ensure the density of the adhesive.

[0061] (4) Curing and solidification: After the triangular tube is implanted and positioned, it should be protected to prevent collision and displacement. Keep it for 3 days until the structural adhesive has cured the raw materials before it can be subjected to force.

[0062] (5) After maintenance, anti-corrosion treatment should be carried out, and earthwork should be filled according to the standard of roadbed replacement to cover the triangular pipe. However, well-graded crushed stone should be laid around the triangular pipe to facilitate the timely drainage of water that has seeped into the roadbed into the triangular pipe.

[0063] (6) Precautions

[0064] If rainwater enters the borehole, it must be soaked with cotton yarn and dried with a heating element before applying adhesive and inserting bolts. Additionally, drilling should not be too fast to avoid overheating the drill bit, which could affect the strength of the surrounding rock strata or damage the drilling rig.

[0065] The above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent changes made in accordance with the claims of the present invention shall still fall within the protection scope of the present invention.

Claims

1. Steep slope semi-cut and semi-fill roadbed, including the mountain, an excavation area is set on the mountain, the excavation area is divided into a lower stepped fill area, a middle flat fill area and an upper excavation area, and stone and soil are backfilled in the lower stepped fill area and the middle flat fill area to form the roadbed. Its features are: The roadbed reinforcement and drainage structure is adopted. One or more layers of boreholes are drilled on the mountain in the lower stepped fill area. The insertion section of the triangular pipe is fixed in the borehole with structural adhesive. One or more layers of triangular pipe are formed in the backfill stone and rammed earth in the lower stepped fill area. The roadbed reinforcement and drainage structure includes a triangular pipe with a triangular cross-section and a horizontally arranged bottom surface. The triangular pipe has a central through-hole and is divided into an insertion section and a drainage section. The bottom surface of the triangular pipe gradually thickens from the outer end of the drainage section to the outer end of the insertion section. The insertion section has a smooth, non-porous surface and a thick bottom, the thickness of which is determined by the shear force it can withstand. Several regularly spaced through-holes are staggered on both sides of the drainage section, and cylindrical filter devices are detachably connected within these holes. The insertion section of the triangular pipe is inserted into a borehole in the side wall of the steep slope road, and structural adhesive is filled between the borehole and the insertion section. The drainage section of the triangular pipe passes through the roadbed at the steep slope and integrates with it. The insertion section acts as a fulcrum, working together with the drainage section to support the weight of the roadbed above the drainage section and the vehicles traveling on it.

2. The steep slope semi-cut and semi-fill roadbed according to claim 1, characterized in that: The inner wall of the circular hole in the drainage section and the connection point with the cylindrical filter device are made of rubber with moderate hardness.

3. The steep slope semi-cut and semi-fill roadbed according to claim 1, characterized in that: The cross-section of the triangular conduit is an isosceles triangle.

4. The steep slope semi-cut and semi-fill roadbed according to claim 1, characterized in that: The inclination angle of the borehole shall not exceed 2°; the side length of the insertion section of the triangular tube shall be L, the radius of the circumscribed circle of the cross section shall be N, the inner diameter of the borehole shall be N+2mm~N+6mm, and the depth of the borehole shall not be less than 1 / 3L, or the depth of the borehole shall be calculated based on the torque bearing capacity of the triangular tube and thus the depth of the tube implanted into the mountain body.

5. The steep slope semi-cut and semi-fill roadbed according to claim 1, characterized in that: In the lower stepped fill area, geogrids are installed between the backfill stones and soil of each step.

6. The steep slope semi-cut and semi-fill roadbed according to claim 1, characterized in that: A landslide prevention structure is provided at the bottom of the lower stepped fill area; if groundwater exists in the construction area, a water-intercepting gravel blind ditch is provided at the junction of the lower stepped fill area and the middle planar fill area; a drainage ditch is provided between the middle planar fill area and the upper excavation area.

7. A method for constructing a steep slope roadbed using a combination of excavation and filling, characterized by: The method employs a steep slope semi-cut / semi-fill roadbed as described in any one of claims 1-6; the method includes the following steps: S1: Construction to be carried out in the excavated area; S2: Mark the drilling locations on the hillside in the lower stepped fill area; S3: The stepped fill area below the borehole is filled in a stepped layered manner, with geogrids arranged in each layer. S4: Drill holes, inject structural adhesive and insert triangular conduits, and complete the construction of supporting measures for the triangular conduits; S5: Continue backfilling with stones and soil above the triangular pipe until the height is consistent with the backfilled stones and soil in the central flat fill area, and then proceed with road construction.

8. The method for constructing a steep slope roadbed using a combination of excavation and filling as described in claim 7, characterized in that: Step S4 consists of the following steps: S41: During the drilling process, debris should be removed frequently; S42: After drilling is completed, use an air compressor and a test tube brush for rinsing; S43: Use Grade A structural adhesive, mix it according to the specified ratio, and inject it into the drilled hole. The amount injected must be sufficient to fill the drilled hole with structural adhesive after the triangular tube is inserted.

9. The method for constructing a steep slope roadbed using a combination of excavation and filling as described in claim 7, characterized in that: In step S43, surface rust removal treatment is required before the triangular tube is implanted; during the implantation of the triangular tube, the air brought in by the triangular tube needs to be vented; after the triangular tube is implanted, curing and anti-corrosion treatment are required.

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