Dividing zone blind ditch in pluvial region and construction method thereof

Abstract

The invention relates to a construction method for separating zone blind ditches in a pluvial area. Longitudinal blind ditches and transverse drainage pipe grooves of separating zones are excavated after road cushion construction and compaction; drainage pipes are laid in the transverse drainage pipe grooves, one ends of the drainage pipes extend into the longitudinal blind ditches, and the other ends of the drainage pipes extend into rainwater pipe inspection wells of the road; a clay water-resisting layer is backfilled and tamped in the longitudinal blind ditch, and the clay water-resisting layer is filled to the lower surface of the road cushion layer; two-cloth and one-film anti-seepage geotechnical cloth is laid in a circle from the separation zone to the longitudinal blind ditch, part of broken stone is backfilled to press the two-cloth and one-film anti-seepage geotechnical cloth, then a hard permeable pipe wrapping first permeable geotechnical cloth is laid, the hard permeable pipe is communicated with a drainage pipe, and a broken stone layer is backfilled to the lower surface of the road cushion layer; a medium-coarse sand layer is laid on the gravel layer and tamped, and finally planting soil is backfilled after second permeable geotextile is laid on the upper surface of the medium-coarse sand layer. The method has the beneficial effects that the problems of blind ditch water seepage and drainage, collapse deformation, roadbed soaking by accumulated rainwater, rainwater overflow and the like are effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of road construction, and in particular to a blind ditch for dividing a rainy area and a construction method thereof. Background Art

[0002] The median is a strip facility set up along the longitudinal direction of the road to separate the carriageway. The median is divided into a center median and a side median. It has the general function of isolating two-way traffic and reducing interference with oncoming traffic. It is also an important area for road greening coverage and the construction area of ​​some signboards. During rainfall or greening maintenance, excess rainwater is mainly drained through soil infiltration. Blind ditch is an underground drainage channel used to drain groundwater, which can increase the drainage speed of road medians. The drainage method of the central median of my country's roads is mainly to lay longitudinal gravel blind ditches and bury transverse plastic drainage pipes to quickly drain excess water from the central median to the green belt. However, longitudinal gravel blind ditches are prone to blockage, resulting in poor drainage and retained water invading the roadbed. General blind ditch materials are prone to deformation.

[0003] Based on the above considerations, how to solve the problems of overflow caused by water accumulation inside the central dividing strip, subsidence of green belts caused by deformation of blind ditch materials and soil erosion, blockage and leakage of blind ditches and erosion of roadbed leading to roadbed instability and disease. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a blind ditch for a rainy area dividing zone and a construction method thereof, so as to overcome the deficiencies in the above-mentioned prior art.

[0005] The technical solution of the present invention to solve the above technical problem is as follows: A method for constructing a blind ditch in a rainy area separation zone comprises the following steps:

[0006] S1. After the road cushion is constructed and compacted, dig the longitudinal blind ditch and transverse drainage pipe trench of the median strip, and level and compact them;

[0007] S2. Lay the drainage pipe in the horizontal drainage pipe trench, and let one end of the drainage pipe extend into the longitudinal blind ditch, and let the other end of the drainage pipe extend into the rainwater pipe inspection well of the road, backfill and tamp to the road cushion layer, and then simultaneously construct the road base and surface layer;

[0008] S3. Backfill and compact the clay waterproof layer in the longitudinal blind ditch, and fill the clay waterproof layer to the lower surface of the road cushion;

[0009] S4. Lay a two-cloth-one-film anti-seepage geotextile along the dividing strip to the longitudinal blind ditch, backfill some gravel to press the two-cloth-one-film anti-seepage geotextile, then lay a hard permeable pipe wrapped with the first permeable geotextile, connect the hard permeable pipe with the drainage pipe with a three-way joint, and backfill the gravel layer to the lower surface of the road cushion;

[0010] S5. Lay a medium-coarse sand layer on the gravel layer and compact it. Finally, lay a second permeable geotextile on the upper surface of the medium-coarse sand layer and backfill with planting soil.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the slopes of the rigid permeable pipes and drainage pipes are respectively the same as the designed longitudinal and transverse slopes of the road surface.

[0013] Furthermore, in S2, both ends of the laid drainage pipe are wrapped with permeable geotextile.

[0014] Furthermore, in S2, both sides of the drainage pipes laid in the transverse drainage pipe trench are padded with medium-coarse sand or encapsulated with concrete.

[0015] Furthermore, in S4, for areas with heavy rainfall, multiple rows of rigid water-permeable pipes are laid, and the rigid water-permeable pipes are connected and fixed with pipe clamps.

[0016] Furthermore, water-absorbing material is provided at the connection point between the rigid water-permeable pipe and the drainage pipe through the three-way joint.

[0017] Furthermore, the drainage pipe adopts PVC drainage pipe.

[0018] Furthermore, the rigid water-permeable pipe adopts a PE curved mesh rigid water-permeable pipe.

[0019] Based on the above technical solution, the present invention also provides a blind ditch for dividing the rainy area, which is constructed by the above construction method.

[0020] The beneficial effects of the present invention are:

[0021] 1) The present invention provides a clay waterproof layer and a two-cloth-one-film anti-seepage geotextile to ensure the stability of the roadbed at the dividing strip through double-layer waterproof protection. The clay waterproof layer can prevent the two-cloth-one-film anti-seepage geotextile from failing or being damaged during construction, causing excess rainwater to enter the roadbed, soften the roadbed at the central dividing strip, and solve the problem of roadbed instability caused by blind ditch leakage and erosion of the roadbed;

[0022] 2) The present invention arranges PE curved mesh hard water-permeable pipes, which are simple to construct, easy to connect, save construction time, have a large opening rate, high strength, good anti-subsidence performance, large drainage capacity, and good durability. The upper part is permeable and the lower part is drained. The connection with the drainage pipe is connected with a three-way joint. The three-way connection is provided with a water-absorbing material, which can quickly store water, quickly drain, and drain quickly. Multiple rows of hard water-permeable pipes can be arranged in areas with large rainfall, which can well reduce groundwater pressure, drain excess rainwater, and eliminate rainwater overflow caused by heavy rainfall. At the same time, the upper soil and structures can be protected from being damaged due to infiltration deformation, and the subsidence of green belts and structures caused by deformation of blind ditch materials and the overflow of rainwater caused by poor drainage can be solved;

[0023] 3) The present invention prevents the soil subsidence of the separation zone caused by blind ditch blockage and soil erosion by sequentially setting multiple anti-filter layers. Specifically, the first permeable geotextile as the first anti-filter layer can effectively prevent large suspended particles, the medium-coarse sand layer as the second anti-filter layer further prevents small suspended particles, and the second permeable geotextile as the third anti-filter layer further enhances the filtering effect, preventing the soil subsidence of the separation zone caused by blind ditch blockage and soil erosion;

[0024] 4) The slope of the transverse drainage pipe and the longitudinal rigid permeable pipe provided in the present invention is the same as the longitudinal and transverse slope of the road surface design, which is conducive to smooth drainage, and the construction is convenient and fast, saving costs and construction period;

[0025] 5) It is mainly used in the construction of blind ditches in road dividing strips in rainy areas in the south. The present invention is the most effective solution obtained through targeted research on the problems encountered in actual on-site construction. After practical application, the present invention has obvious effects on the drainage of blind ditches in road dividing strips, controlling the collapse and deformation of blind ditches under the compression of soil, and preventing rainwater from accumulating and soaking the roadbed and rainwater from overflowing. It has strong applicability and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the blind ditch of the rainy area separation zone constructed in the present invention;

[0027] Figure 2 The present invention is a plan view of the blind ditch in the rainy area separation zone constructed in the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1. cushion layer, 2. drainage pipe, 3. rainwater pipe inspection well, 4. base layer, 5. surface layer, 6. clay waterproof layer, 7. two-cloth-one-film anti-seepage geotextile, 8. first permeable geotextile, 9. hard permeable pipe, 10. gravel layer, 11. medium-coarse sand layer, 12. second permeable geotextile, 13. planting soil, 14. water-absorbent material. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] Example 1

[0032] like Figure 1 , Figure 2 As shown, a construction method of a blind ditch in a rainy area separation zone includes the following steps:

[0033] S1. After the road cushion layer 1 is constructed and compacted, the lines are measured and laid out, the longitudinal blind ditch of the dividing strip and the transverse drainage pipe groove are excavated, and the leveling and compacting are performed manually;

[0034] S2. Lay the drainage pipe 2 in the transverse drainage pipe groove, and let one end of the drainage pipe 2 extend into the longitudinal blind ditch, and let the other end of the drainage pipe 2 extend into the rainwater pipe inspection well 3 of the road, backfill and tamp to the road cushion layer 1, and then simultaneously construct the road base layer 4 and surface layer 5;

[0035] S3. After the construction of the road base layer 4 and the surface layer 5 is completed, the clay waterproof layer 6 is backfilled and compacted in the longitudinal blind ditch. The backfilling process can be implemented manually, and special attention is paid to the clay encapsulation at the drainage pipe 2. The clay waterproof layer 6 is filled to the lower surface of the road cushion layer 1;

[0036] S4, laying two-cloth-one-film anti-seepage geotextile 7 along the dividing strip to the longitudinal blind ditch, backfilling part of the crushed stone to press the two-cloth-one-film anti-seepage geotextile 7, and then laying the hard permeable pipe 9 wrapped with the first permeable geotextile 8, the number of layers of the first permeable geotextile 8 wrapped on the hard permeable pipe 9 can be one layer, and the hard permeable pipe 9 is connected to the drainage pipe 2 by a three-way joint, paying special attention to the openings of the two-cloth-one-film anti-seepage geotextile 7 and the anti-seepage treatment at the openings, and backfilling the crushed stone layer 10 to the lower surface of the road cushion layer 1;

[0037] S5, laying a medium-coarse sand layer 11 on the gravel layer 10 and compacting it, and finally laying a second permeable geotextile 12 on the upper surface of the medium-coarse sand layer 11 and backfilling with planting soil 13.

[0038] Example 2

[0039] like Figure 1 As shown, this embodiment is a further improvement on the basis of embodiment 1, and the details are as follows:

[0040] The slopes of the rigid permeable pipe 9 and the drainage pipe 2 are respectively the same as the longitudinal and transverse slopes designed for the road surface.

[0041] Example 3

[0042] like Figure 1 As shown, this embodiment is a further improvement on the basis of Embodiment 1 or 2, and the details are as follows:

[0043] In S2 , both ends of the drainage pipe 2 laid in the transverse drainage pipe trench are wrapped with a permeable geotextile to prevent dirt and other impurities from entering the drainage pipe 2 .

[0044] Example 4

[0045] like Figure 1 As shown, this embodiment is a further improvement on any one of Embodiments 1 to 3, and the details are as follows:

[0046] In S2, both sides of the drainage pipe 2 laid in the transverse drainage pipe trench are padded with medium-coarse sand or encapsulated with concrete.

[0047] Example 5

[0048] like Figure 1 As shown, this embodiment is a further improvement on any one of Embodiments 1 to 4, and the details are as follows:

[0049] In S4, for areas with heavy rainfall, multiple rows of rigid water-permeable pipes 9 are laid, and the rigid water-permeable pipes 9 are connected and fixed with pipe clamps to prevent them from shifting when backfilling gravel. The pipes only need to be connected with matching straight-through and elbow fittings. Pay special attention to the position where the rigid water-permeable pipes 9 are connected to the drainage pipes 2, and position the drainage pipes properly. In addition, water-absorbing materials 14 are provided at the connection between the rigid water-permeable pipes 9 and the drainage pipes 2 through three-way joints.

[0050] Example 6

[0051] like Figure 1 As shown, this embodiment is a further improvement on any one of Embodiments 1 to 5, and the details are as follows:

[0052] The drain pipe 2 is preferably a PVC drain pipe, and the rigid water-permeable pipe 9 is preferably a PE curved mesh rigid water-permeable pipe.

[0053] Example 7

[0054] A blind ditch for a dividing zone in a rainy area, characterized in that it is constructed by the construction method described in any one of embodiments 1 to 6.

[0055] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for constructing blind ditches in rainy area separation zones, characterized in that: The steps include: S1. After the road cushion layer (1) is constructed and compacted, a longitudinal blind ditch and a transverse drainage pipe trench are excavated in the median strip, and the trenches are leveled and compacted; S2, laying a drainage pipe (2) in the transverse drainage pipe groove, and extending one end of the drainage pipe (2) into the longitudinal blind ditch, and extending the other end of the drainage pipe (2) into the rainwater pipe inspection well (3) of the road, backfilling and compacting to the road cushion layer (1), and then simultaneously constructing the road base layer (4) and surface layer (5); S3, backfilling and compacting the clay waterproof layer (6) in the longitudinal blind ditch, and filling the clay waterproof layer (6) to the lower surface of the road cushion layer (1); S4, laying a two-cloth-one-film anti-seepage geotextile (7) along the dividing strip to the longitudinal blind ditch, backfilling part of the crushed stone to press the two-cloth-one-film anti-seepage geotextile (7), then laying a hard permeable pipe (9) wrapped with the first permeable geotextile (8), and connecting the hard permeable pipe (9) to the drainage pipe (2) with a three-way joint, and backfilling the crushed stone layer (10) to the lower surface of the road cushion layer (1); S5, laying a medium-coarse sand layer (11) on the gravel layer (10) and compacting it, and finally laying a second permeable geotextile (12) on the upper surface of the medium-coarse sand layer (11) and backfilling with planting soil (13).

2. The method for constructing blind ditches in rainy area separation zones according to claim 1, characterized in that: The slopes of the hard permeable pipe (9) and the drainage pipe (2) are respectively the same as the longitudinal and transverse slopes designed for the road surface.

3. The method for constructing blind ditches in rainy area separation zones according to claim 1, characterized in that: In S2, both ends of the laid drainage pipe (2) are wrapped with permeable geotextile.

4. The method for constructing blind ditches in rainy area separation zones according to claim 1, characterized in that: In S2, both sides of the drainage pipe (2) laid in the transverse drainage pipe trench are padded with medium-coarse sand or encapsulated with concrete.

5. The method for constructing blind ditches in rainy area separation zones according to claim 1, characterized in that: In S4, for areas with heavy rainfall, multiple rows of rigid water-permeable pipes (9) are laid, and the rigid water-permeable pipes (9) are connected and fixed by pipe clamps.

6. The method for constructing blind ditches in rainy area separation zones according to claim 1, characterized in that: A water absorbing material (14) is provided at the connection point between the hard water-permeable pipe (9) and the drainage pipe (2) via a three-way joint.

7. The method for constructing blind ditches in rainy area separation zones according to claim 1, characterized in that: The drainage pipe (2) is a PVC drainage pipe.

8. The method for constructing blind ditches in rainy area separation zones according to claim 1, characterized in that: The hard water-permeable pipe (9) is a PE curved mesh hard water-permeable pipe.

9. A blind ditch for dividing a rainy area, characterized in that: The method is constructed by the construction method according to any one of claims 1 to 8.

Images