CN204325845U - The earth shoulder blind-drainage system of a kind of road surface edge central drainage - Google Patents

Abstract

The utility model relates to a soil road shoulder blind ditch system for concentrated drainage at the edge of the road surface. Concentrated drainage measures at the edge of the road surface have surface water, sand blocking, and snow blocking, which are not conducive to cleaning, conflict with the position of the guardrail, small capacity, small longitudinal spacing of drainage grooves, not suitable for small longitudinal slopes and zero longitudinal slopes, and poor frost resistance. and other shortcomings. The utility model sets a cement concrete base on the top surface of the road bed at the edge of the road and along the longitudinal direction of the road. The cross section is U-shaped, and a longitudinal groove is reserved at the bottom of the groove. The permeable pipe wall, the lower part is the impermeable pipe wall; the top of the semi-permeable sand-free pipe is filled with graded gravel to the surface of the embankment slope. The utility model can make the road surface water flow over the road surface and soil road shoulders and then infiltrate into the graded crushed stone layer, and then flow into the semi-permeable sand-free pipe to flow longitudinally along the road, and be discharged along the drainage tank without water accumulation and sand and snow resistance. Strong longitudinal slope adjustment ability, able to adapt to small longitudinal slope or zero longitudinal slope road section, avoiding frequent cutting of slope protection works.

Description

A Soil Shoulder Blind Ditch System with Concentrated Drainage at the Side of the Pavement

technical field

    The utility model belongs to the technical field of highway drainage engineering, in particular to an earth shoulder blind ditch system for centralized drainage at the side of the road surface.

Background technique

The technology of centralized drainage at the edge of the road surface is to set up water collection and drainage devices at the soil shoulders at the edge of the roadbed to intercept and discharge the rainwater on the road surface in a concentrated manner. The application of this technology can effectively eliminate the scouring hazard of road rainwater on the fill embankment slope, reduce the pressure of embankment slope protection, effectively reduce the amount of masonry for slope protection engineering, and save engineering investment.

At present, this technology is widely used in domestic highways at all levels. There are two main solutions: ① Set up a raised water-retaining belt on the edge of the road surface, and the road water that flows in horizontally will flow along the outer road surface under the action of the longitudinal slope of the road and the water-retaining belt, at regular intervals (about 18 ~28m) Set up a drainage channel to discharge the road surface water along the side slope into the side ditch on the road side. ② Set shallow butterfly-shaped, rectangular and other water collection tanks on the edge of the road surface, and also set up a drain tank at a certain interval (according to the capacity of the ditch) to drain the road surface water. Both of the above two types of schemes have their own shortcomings. The raised waterstop scheme has road surface water, sand blocking, snow blocking, unfavorable road cleaning, poor frost resistance, small longitudinal spacing of drainage grooves, and is not suitable for small longitudinal slopes and zero longitudinal slopes. Sloping road sections and other shortcomings; the scheme of the road edge water collection tank has the disadvantages of conflicting with the position of the roadside guardrail column, small capacity, small longitudinal spacing of the gutter, poor frost resistance, uncoordinated, easily damaged, and unsafe, and some schemes are designed to increase the capacity. Thereby prolonging the spacing of the gutters, even on the premise of changing the top width of the roadbed.

Contents of the invention

The purpose of the utility model is to provide a soil road shoulder blind ditch system for concentrated drainage at the edge of the road surface, which can effectively solve the problems existing in the prior art.

The technical scheme adopted in the utility model is:

An earth shoulder blind ditch system with concentrated drainage at the edge of the road surface, characterized in that:

Set a cement concrete base on the top of the road bed at the edge of the road, outside the guardrail, and along the longitudinal direction of the road;

The cement concrete base is a U-shaped trough base with a U-shaped cross section, and a longitudinal groove is reserved at the bottom of the base groove, and a semi-permeable sand-free pipe is placed in the groove;

The upper part of the semi-permeable sand-free pipe is a permeable pipe wall, and the lower part is an impermeable pipe wall;

Fill the graded gravel above the semi-permeable sand-free pipe to the surface of the subgrade slope.

A layer of cement mortar is coated on the bottom surface of the cement concrete base.

The groove wall inside the cement concrete base is set vertically; the inner wall of the outer groove wall is perpendicular to the surface of the embankment slope, and the outer wall is vertical;

The top of the groove wall outside the cement concrete base is a water-retaining protrusion, which is higher than the surface of the roadbed slope.

The top of the soil shoulder hardens above the cement concrete base graded crushed stone.

PVC drainage pipe holes are reserved at the top of the groove wall inside the cement concrete base, which are connected with the three-dimensional drainage network laid in the pavement structure layer.

On the side slope of the embankment, drainage channels vertically connected to the semi-permeable sand-free pipe and down the side slope of the embankment are arranged at intervals.

Both the cement concrete base and the semi-permeable sand-free pipe are prefabricated in sections.

In the other areas of the soil shoulder, fill the shoulder earth and backfill with cohesive soil.

The utility model has the following advantages:

①It will not cause shortcomings such as road accumulation, sand blocking, snow blocking and unfavorable road cleaning;

② There is no conflict with the position of the roadside guardrail column;

③The structure is simple and firm, not easy to damage, and can guarantee functional stability and long-term performance;

④The invisible effect is good, it does not affect the outer contour of the roadbed, and the driving safety and landscape effect are excellent;

⑤ good thermal insulation, strong ability to resist freezing in winter;

⑥ It has strong longitudinal slope adjustment ability and can adapt to small longitudinal slope or zero longitudinal slope sections;

⑦The capacity is large, and the distance between the drains is generally about 120m, which avoids frequent cutting of slope protection works.

Description of drawings

Fig. 1 is a structural diagram of the utility model.

Figure 2 is a structural diagram of the cement concrete base.

Figure 3 is a reinforcement diagram of the cement concrete base.

Fig. 4 is a structural diagram of a semi-permeable sand-free pipe.

In the figure, 1—graded crushed stone, 2—semi-permeable sand-free pipe, 3—cement concrete base, 4—cement mortar, 5—top surface of road bed, 6—cultivation of road shoulder, 7—hardening of soil shoulder top, 8—road side guardrail, 9—road surface, 10—dirt road shoulder range, 11—thickness of pavement structure layer, 12—slope protection, 13—three-dimensional drainage network, 14—PVC drainage pipe, 15—water blocking protrusion, 16 - permeable area, 17 - impermeable area.

Detailed ways

The utility model is described in detail below in conjunction with specific embodiments.

The utility model relates to an soil road shoulder blind ditch system with concentrated drainage at the edge of the road surface. A cement concrete base 3 is arranged on the top surface 5 of the road bed at the edge of the road surface, outside the guardrail 8, and along the longitudinal direction of the road, using C25 cement concrete Prefabricated and reinforced, considering the convenience of handling, prefabricated according to the length of 50cm. A layer of cement mortar 4 is applied to the bottom surface of the cement concrete base 3, and M10 cement mortar is used to fix the base and adjust the vertical slope. The cement concrete base 3 is a groove-shaped base with a U-shaped cross section, and a longitudinal groove is reserved at the bottom of the base groove, and a semi-permeable sand-free pipe 2 is placed in the groove. The upper half of the semi-permeable sand-free pipe 2 is a permeable pipe wall, and the lower half is an impermeable pipe wall. The top of the semi-permeable sand-free pipe 2 is filled with graded gravel 1 to the surface of the embankment slope. Both the cement concrete base 3 and the semi-permeable sand-free pipe 2 are prefabricated in sections. The U-shaped cement concrete base 3 plays a role of supporting the semi-permeable sand-free pipe 2, and plays the functions of intercepting water, collecting water and adjusting the longitudinal slope of the bottom of the pipe.

The groove wall on the inside of the cement concrete base 3 is higher than the groove wall on the outside. The inner groove wall is arranged vertically; the inner wall of the outer groove wall is perpendicular to the surface of the embankment slope, and the outer wall is vertical. The top of the groove wall outside the cement concrete base 3 is a water-retaining protrusion 15, which is 8cm higher than the surface of the embankment slope.

Above the graded crushed stone 1 of the cement concrete base 3, a soil shoulder top hardening 7 is arranged. 14 holes of PVC drainage pipes with 2m spacing are reserved at the top of the groove wall inside the cement concrete base 3, which are connected with the three-dimensional drainage network 13 laid in the pavement structure layer (or use waterproof geotextiles with gravel, gravel, permeable concrete, etc. to realize same function).

A drainage channel vertically connected to the semi-permeable sand-free pipe 2 and down the side slope of the embankment is arranged at a certain interval (about 120m) in the longitudinal direction of the side slope of the subgrade.

Under the action of the cross-slope of the road crown, the water on the road surface overflows the road surface and the soil road shoulder, and then seeps into the blind ditch graded gravel layer in the soil road shoulder, and then flows into the semi-permeable sand-free pipe 2 and flows longitudinally along the road. The spacing (about 120m) is to set a drainage channel on the side slope of the subgrade and connect with the semi-permeable sand-free pipe 2 to discharge the road surface water.

The construction process is as follows:

After filling the embankment to the top surface 5 of the road bed, determine the position of the cement concrete base 3, apply 5 cm thick cement mortar 4 on the top surface 5 of the road bed at the corresponding position, and fix the prefabricated cement concrete base 3 on the Cement mortar 4 The surface of the mortar layer is vertically connected piece by piece. After the joints of the cement concrete base 3 have been cured, a semi-permeable sand-free pipe 2 is placed in the groove reserved for the cement concrete base 3 and connected. The upper part of the sand pipe 2 is filled with graded crushed stone 1 to the surface of the embankment slope, and the road shoulders in other areas of the soil shoulder are backfilled with cohesive soil.

It can be seen from the above construction process that:

①Water on the road surface flows out of the road surface without being blocked by any protrusions, so that there will be no problems such as water accumulation, sand blocking, snow blocking, and difficult cleaning; ②Blind ditch is located below the outer slope of the soil shoulder and is naturally avoided. The positional conflict with the roadside guardrail foundation is eliminated; ③The structure of the system is simple and prefabricated, and it can be constructed in a modular manner with high efficiency; ④After the completion, the entire ditch is buried inside the soil shoulder, so the invisible effect is good ; ⑤ The blind ditch is located below the surface, and there is a graded gravel layer to isolate it from the outside air temperature; good thermal insulation performance is a common feature of blind ditch structures. The anti-freeze performance in winter is better than that of open ditch and raised water retaining strip; ⑥In the small longitudinal slope or zero longitudinal slope section of the road, it can be adjusted by adjusting the thickness of the cement mortar cushion at the bottom of the foundation or 0~5cm on the top surface of the road bed. The shallow excavation of the pipe bottom is used to adjust the longitudinal slope of the pipe bottom to ensure the minimum longitudinal slope requirement of 0.5%. ⑦Take a two-way four-lane expressway with a design speed of 100 km/h in Hangzhou, Zhejiang Province, an eastern coastal province of my country, as an example. year, the confluence time is calculated to be 0.217 minutes, and the rainstorm intensity q=567 liters/second·ha. If the catchment area is calculated based on the road length of 120m, it should be 1410 square meters, and the rainwater flow Q is calculated to be 260 cubic meters per hour, which is 0.072 cubic meters per second after unit conversion. The semi-permeable sand-free pipe is calculated according to the 30cm diameter and 1% vertical slope, and its drainage capacity Qc is 0.0738 cubic meters per second, and Qc>Q meets the drainage needs. Considering that only the drainage capacity of the non-sand pipe is considered in the calculation, and the U-shaped foundation also has a certain water capacity, the reserve value of the drainage capacity of the system is relatively high.

maintenance and repair;

After completion, the earth shoulder blind ditch system will work stably for a long time during the road operation period. But in the long run, considering that the pores of the graded gravel on the surface of the blind ditch will be gradually blocked by sediment and garbage. Therefore, according to the actual pollution rate of each road, it is necessary to carry out maintenance work such as excavation, cleaning, and backfilling of the graded gravel within the thickness of the surface layer of 10cm every two years. The sand-free pipe is repaired and replaced according to the specific damage point.

The content of the utility model is not limited to the examples listed, and any equivalent transformations taken by those skilled in the art to the technical solution of the utility model by reading the specification of the utility model are covered by the claims of the utility model.

Claims (8)

1. an earth shoulder blind-drainage system for road surface edge central drainage, is characterized in that:

On the roadbed end face (5) of road surface edge, outside guardrail (8), along road, longitudinally one cement concrete pedestal (3) is set;

The flute profile pedestal that cement concrete pedestal (3) is U-shaped profile, is reserved with longitudinal groove at the bottom of base seat groove, be mounted with semi-transparency type without sandpipe (2) in groove;

Semi-transparency type is permeable tube wall without sandpipe (2) the first half, and the latter half is waterproof tube wall;

Semi-transparency type fills graded broken stone (1) to roadbed side slope surface without sandpipe (2) top.

2. the earth shoulder blind-drainage system of a kind of road surface edge central drainage according to claim 1, is characterized in that:

Cement concrete pedestal (3) coated on bottom side is wiped with one deck cement mortar (4).

3. the earth shoulder blind-drainage system of a kind of road surface edge central drainage according to claim 2, is characterized in that:

The cell wall of cement concrete pedestal (3) inner side is vertically arranged; The inwall of outside cell wall is perpendicular to roadbed side slope surface, and outer wall is vertical;

The top of the cell wall in cement concrete pedestal (3) outside, for blocking water projection (15), exceeds roadbed side slope surface.

4. the earth shoulder blind-drainage system of a kind of road surface edge central drainage according to claim 3, is characterized in that:

Earth shoulder top sclerosis (7) of cement concrete pedestal (3) graded broken stone (1) top.

5. the earth shoulder blind-drainage system of a kind of road surface edge central drainage according to claim 4, is characterized in that:

The cell wall top of cement concrete pedestal (3) inner side is reserved with PVC tapping pipe (14) hole, is communicated with the three-dimensional water discharge net (13) laid in road surface structare layer.

6. the earth shoulder blind-drainage system of a kind of road surface edge central drainage according to claim 5, is characterized in that:

Roadbed side slope is arranged at intervals with vertical connection in semi-transparency type without sandpipe (2), along side slope of embankment and under drain tank.

7. the earth shoulder blind-drainage system of a kind of road surface edge central drainage according to claim 6, is characterized in that:

Cement concrete pedestal (3) and semi-transparency type are without sandpipe (2) all prefabricates.

8. the earth shoulder blind-drainage system of a kind of road surface edge central drainage according to claim 7, is characterized in that:

Curb ridging (6) is filled in other regions of earth shoulder, uses cohesive soil backfill.