An interlayer drainage structure based on "white plus black" pavement

Abstract

The utility model discloses a kind of interlayer drainage structures based on "white plus black" pavement, belong to pavement drainage technical field, it includes water collecting pipe along road longitudinal gradient and is laid, water collecting pipe is laid in asphalt concrete surface layer and cement concrete pavement base layer interface end portion, and is fixed in the lower part of flat stone, water collecting pipe faces the water side of pavement structural layer and is provided with multiple water-permeable holes, in the direction of road cross section, interlayer retained rainwater flows into water collecting pipe and is collected by water-permeable hole;Drain pipe is arranged at the longitudinal section low point in road longitudinal section direction, and is communicated with water collecting pipe, another end of drain pipe is communicated with drainage ditch;Wherein, water collecting pipe and drain pipe are all composed of water-permeable spring pipe, water-permeable geotextile is wrapped outside water-permeable spring pipe and steel sleeve body is sleeved outside water-permeable geotextile.The utility model is collected water by the aid of road transverse slope and longitudinal slope, and water is guided, drained by water-permeable spring pipe, principle is simple and clear, and drainage is effective.

Description

Technical Field

[0001] This utility model belongs to the field of road drainage technology, specifically, it relates to an interlayer drainage structure based on "white-and-black" road surfaces. Background Technology

[0002] "White-on-black" refers to a pavement structure that uses cement concrete as the base layer and asphalt concrete as the surface layer. This type of pavement structure is often used for simple overlay renovations of existing cement pavements that are in good condition, or for the construction of low-grade roads where traffic volume is low and the depth of excavation is limited.

[0003] Because cement concrete base layers have lower permeability compared to asphalt concrete pavements, rainwater seeps into the cement concrete base layer through the asphalt concrete pavement and cannot drain quickly, resulting in water retention between layers. This retained rainwater, repeatedly acted upon by vehicles, weakens the adhesion between asphalt aggregates, causing them to loosen and leading to various pavement defects. Therefore, rapidly draining retained rainwater is crucial for maintaining the performance and lifespan of "white-on-black" pavements. Utility Model Content

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] An interlayer drainage structure based on "white-on-black" pavement includes:

[0006] The water collection pipe is laid along the longitudinal slope of the road. The water collection pipe is laid at the end of the interface between the asphalt concrete surface layer and the cement concrete pavement base layer and is fixed to the lower part of the flat stone. The water collection pipe has multiple water-permeable holes on the water-facing side of the pavement structure layer. In the cross section of the road, the rainwater retained between the layers flows into the water collection pipe through the water-permeable holes for collection.

[0007] The discharge pipe is located at the lowest point of the longitudinal section of the road and is connected to the water collection pipe. The other end of the discharge pipe is connected to the drainage ditch.

[0008] The water inlet pipe and the water outlet pipe are both composed of a permeable spring pipe, a permeable geotextile wrapped around the permeable spring pipe, and a steel sleeve fitted around the permeable geotextile. Multiple permeable holes are opened only on the water-facing side of the steel sleeve of the water inlet pipe.

[0009] Furthermore, it also includes:

[0010] Multiple iron wires are tied to the permeable geotextile at intervals, and the iron wires in the water collection pipe pass through the permeable holes on the steel sleeve and are tied and fixed to the steel sleeve.

[0011] Furthermore, the diameter of the permeable spring tube is 2 to 4 cm.

[0012] Furthermore, the diameter of the iron wire is 1 to 3 mm.

[0013] Furthermore, the plurality of permeable holes are arranged in a quincunx pattern, and the opening rate is 10% to 20%.

[0014] Furthermore, the width of the steel sleeve is 4-6 cm; the height of the steel sleeve in the water collection pipe is adapted to the thickness of the concrete pad layer under the flat stone.

[0015] Furthermore, the steel sleeve in the water collection pipe includes multiple standard steel sleeve sections connected end to end, each standard steel sleeve section being 1m in length and placed flush with the flat stone.

[0016] The beneficial effects of this utility model are:

[0017] This utility model utilizes the transverse and longitudinal slopes of the road to collect water, and uses permeable spring pipes for water diversion and drainage. The principle is simple and clear, and the drainage is effective.

[0018] This invention simplifies construction by placing the steel sleeve under the flat stone, flush with the joint, and constructing it simultaneously with the concrete base layer beneath the stone, requiring no additional steps. For maintenance, only the existing flat stone needs to be removed, exposing the steel sleeve entirely, making maintenance convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the water collection section layout of an interlayer drainage structure based on a "white-and-black" road surface according to this utility model;

[0020] Figure 2 This is a schematic diagram of the discharge section layout of an interlayer drainage structure based on a "white-and-black" road surface according to this utility model.

[0021] Figure 3 This is a schematic diagram of the longitudinal drainage structure of the interlayer drainage structure based on the "white plus black" road surface according to this utility model;

[0022] Figure 4 This is a detailed diagram of the interlayer drainage structure connection based on the "white-and-black" road surface of this utility model.

[0023] In the diagram: 1. Water inlet pipe; 2. Drainage pipe; 3. Flat stone; 4. Concrete subbase; 5. Drainage ditch; 6. Asphalt concrete surface layer; 7. Cement concrete pavement base layer; 8. High point of longitudinal section; 9. Low point of longitudinal section; 10. Steel sleeve; 11. Permeable spring pipe; 12. Road surface. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Example 1

[0026] refer to Figures 1 to 4 An interlayer drainage structure based on "white-on-black" pavement includes:

[0027] Water collection pipe 1 is laid along the longitudinal slope of the road. Water collection pipe 1 is laid at the end of the interface between the asphalt concrete surface layer 6 and the cement concrete pavement base layer 7, and is fixed to the lower part of the flat stone 3. Multiple water permeable holes are opened on the water-facing side of the road structure layer. In the cross section direction of the road, the rainwater retained between the layers flows into the water collection pipe 1 through the water permeable holes for collection.

[0028] In practice, the water collection pipe 1 is laid at the end of the interface between the asphalt concrete surface layer 6 and the cement concrete pavement base layer 7, that is, at the junction of the flat stone and the pavement structure layer. It forms a water distribution line through the cross slope of the base layer to carry out effective water collection and delivery.

[0029] Discharge pipe 2 is located at the lowest point 9 of the longitudinal section in the longitudinal direction of the road and is connected to the water collection pipe 1. The other end of discharge pipe 2 is connected to the drainage ditch 5.

[0030] The water inlet pipe 1 and the outlet pipe 2 are both composed of a permeable spring pipe 11, a permeable geotextile wrapped around the permeable spring pipe 11, and a steel sleeve 10 sleeved on the outside of the permeable geotextile. Multiple permeable holes are opened only on the water-facing side of the steel sleeve 10 of the water inlet pipe 1.

[0031] In practical implementation, this utility model has the advantages of simple principle and effective drainage. This utility model uses the transverse and longitudinal slopes of the road to collect water, and uses permeable spring pipes to draw water in and drain water. The principle is simple and clear, and the drainage is effective.

[0032] In practical implementation, this utility model has the advantages of simple construction and convenient maintenance. The steel sleeve of this utility model is placed under the flat stone, flush with the joint, and is constructed simultaneously with the concrete pad layer under the flat stone, without the need for additional operations. During maintenance, only the existing flat stone needs to be removed, and the steel sleeve can be fully exposed.

[0033] In this embodiment, it also includes:

[0034] Multiple iron wires are tied to the permeable geotextile at intervals, and the iron wires in the water collection pipe 1 pass through the water-permeable holes on the steel sleeve 10 and are tied and fixed to the steel sleeve 10.

[0035] In this embodiment, the diameter of the permeable spring tube 11 is 2 to 4 cm.

[0036] The preferred size is 3cm.

[0037] In this embodiment, the diameter of the iron wire is 1 to 3 mm.

[0038] The preferred size is 2cm.

[0039] In this embodiment, the multiple permeable holes are arranged in a quincunx pattern, and the opening rate is 10% to 20%, preferably 15%.

[0040] In this embodiment, the width of the steel sleeve 10 is 4 to 6 cm; preferably 5 cm, and the height of the steel sleeve 10 in the water collection pipe 1 is adapted to the thickness of the concrete pad 4 under the flat stone 3.

[0041] In this embodiment, the steel sleeve 10 in the water inlet pipe 1 includes multiple standard steel sleeve 10 segments connected end to end. The length of each standard steel sleeve 10 segment is 1m, and it is placed flush with the flat stone 3.

[0042] In practice, the interlayer drainage structure plays a role throughout the rainfall process, mainly through the following steps:

[0043] S1. Installation and Fixing: The installation and fixing of the drainage structure between layers is carried out simultaneously with the flat stone 3 and its fine stone concrete cushion layer. Specifically, the permeable spring pipe 11 is wrapped with permeable geotextile and tied with thin iron wire every 10m. It is placed in the steel sleeve 10 and the thin iron wire is then tied and fixed to the permeable holes of the steel sleeve 10. The steel sleeve 10 is installed at the end of the interface between the asphalt concrete pavement and the cement concrete base layer, that is, at the junction of the flat stone and the pavement structure layer, and fixed to the lower part of the flat stone.

[0044] Preferably, the permeable spring tube has a diameter of 3cm; the thin iron wire has a diameter of 2mm; the steel sleeve has a rectangular cross-section, a width of 5cm, and a height that is adjusted according to the thickness of the concrete subbase. It is sealed on three sides, and permeable holes are opened on the water-facing side of the 12 structural layers facing the road surface, with an opening rate of 15% and a quincunx arrangement.

[0045] Preferably, the steel sleeve can be designed in 1m sections and placed flush with the flat stone.

[0046] S2. Water Collection Stage: The water collection process exists throughout the entire rainfall process. Rainwater falls onto the asphalt concrete pavement. Due to the difference in permeability of different pavement materials, it remains between the asphalt concrete pavement and the cement concrete base layer, forming interlayer rainwater retention. In the cross-sectional direction of the road, the interlayer rainwater flows along the cross slope of the top surface of the cement concrete base layer to the junction of the paving stone and the pavement structure layer. It enters the steel sleeve through the water-facing holes on the water-facing side of the steel sleeve, completing the lateral collection of the interlayer rainwater. In the longitudinal section of the road, the pavement elevation fluctuates with the longitudinal slope. The interlayer drainage structure also generates a longitudinal section high point 8 and a longitudinal section low point 9 according to the pavement elevation. A discharge pipe is set at the longitudinal section low point 9 to complete the longitudinal collection of the interlayer rainwater.

[0047] S3, Water Delivery Stage: As rainfall duration increases, rainwater continuously enters the steel casing, passes through the permeable geotextile and into the permeable spring pipe. Enclosed and guided by the permeable spring pipe, the water is discharged externally through the transverse discharge pipe 2 at the lowest point of the road longitudinal section elevation.

[0048] In practical implementation, this utility model is highly necessary and has widespread engineering significance. "White plus black" pavement is widely used in actual engineering projects. The combination of asphalt concrete pavement and cement concrete base inevitably leads to the problem of rainwater retention between layers, and poor drainage of water between layers will inevitably lead to damage to the pavement structure.

[0049] In practical implementation, this utility model uses conventional materials and has a standard structure: all components of this utility model are made of conventional engineering materials, and there are no special requirements for dimensions, which can realize standardized design, mass production, and finished product purchase.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model are included within the protection scope of this utility model.

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