阅读说明：本技术 装配式双管渗排水盲沟以及路基渗排水结构的施工方法 (Construction method of assembled double-pipe seepage and drainage blind ditch and roadbed seepage and drainage structure ) 是由 石晓娜 于 2019-11-21 设计创作，主要内容包括：本发明公开了装配式双管渗排水盲沟以及路基渗排水结构的施工方法。该装配式双管渗排水盲沟包括首尾连接的排水单元,所述排水单元包括：第一排水管,所述第一排水管的管壁上设有第一渗水孔；第一过滤层,所述第一过滤层包裹于所述第一排水管的外部；第二排水管,所述第二排水管设于所述第一排水管的内部,所述第二排水管的管壁上设有第二渗水孔；第二过滤层,所述第二过滤层包裹于所述第二排水管的外部并形成位于第一排水管内壁与所述第二过滤层之间的空腔。本发明结构简单,可在工厂内提前拼装后运输至现场,实现了全部部件装配的理念,装配速度更快和效率更高,装配所需人工更少,装配施工工期更短,施工成本更低和质量更易控制。(The invention discloses an assembled double-pipe seepage and drainage blind ditch and a construction method of a roadbed seepage and drainage structure. This double-barrelled drainage blind ditch that oozes of assembled includes end to end connection's drainage unit, drainage unit includes: the pipe wall of the first drainage pipe is provided with a first water seepage hole; the first filtering layer is wrapped outside the first drainage pipe; the second drain pipe is arranged inside the first drain pipe, and a second water seepage hole is formed in the pipe wall of the second drain pipe; and the second filter layer is wrapped outside the second drain pipe and forms a cavity between the inner wall of the first drain pipe and the second filter layer. The invention has simple structure, can be assembled in advance in a factory and then transported to the site, realizes the idea of assembling all components, has faster assembling speed and higher efficiency, requires less labor for assembling, has shorter assembling construction period, lower construction cost and easier quality control.)

1. The assembled double-barrelled drainage french drain that oozes, including end to end connection's drainage unit, its characterized in that: the drainage unit includes:

the water pipe comprises a first water drainage pipe (100), wherein a first water seepage hole (110) is formed in the pipe wall of the first water drainage pipe (100);

a first filter layer (310), the first filter layer (310) wrapping outside the first drain pipe (100);

the second water drainage pipe (200), the second water drainage pipe (200) is arranged inside the first water drainage pipe (100), and a second water seepage hole (210) is formed in the pipe wall of the second water drainage pipe (200);

the second filter layer (320), the second filter layer (320) wraps the outside of the second drain pipe (200) and forms a cavity between the inner wall of the first drain pipe (100) and the second filter layer (320);

a first clear liquid obtained by filtering the first filtering layer (310) enters the cavity through the first water seepage holes (110), and a second clear liquid obtained by filtering a part of the first clear liquid by the second filtering layer (320) enters the inside of the second drain pipe (200) through the second water seepage holes (210).

2. The fabricated double-barreled seepage drainage blind ditch of claim 1, wherein: a support assembly (400) for supporting the first drain pipe (100) and the second drain pipe (200) is arranged in the cavity.

3. The fabricated double-barreled seepage drainage blind ditch of claim 2, wherein: the support assembly (400) comprises a support structure distributed at a distance, the support structure comprising:

a support ring (410), wherein the support ring (410) is sleeved outside the second filter layer (320);

the supporting rod (420), bracing piece (420) distribute in support ring (410) all around, the one end of bracing piece (420) with support ring (410) are connected, the other end with the cooperation of first drain pipe (100) inner wall.

4. The fabricated double-barreled seepage drainage blind ditch of claim 3, wherein: the longitudinal lengths of the support ring (410) and the support rod (420) are 5-10 cm; the distance between two adjacent supporting structures is 0.3-0.7 m.

5. The fabricated double-barreled seepage drainage blind ditch of claim 1, wherein: the first drain pipe (100) is a corrugated pipe; preferably, the first drain pipe (100) is a HDPE double-wall corrugated pipe.

6. The fabricated double-barreled seepage drainage blind ditch of claim 1, wherein: the first filter layer (310) and the second filter layer (320) are filter layers with the interception rate of particulate matters with the granularity of more than or equal to 0.5 mu m of more than or equal to 95 percent.

7. The fabricated double-barreled seepage drainage blind ditch of claim 1, wherein: the first water seepage holes (110) are distributed on the pipe wall at two thirds of the upper part of the first drainage pipe (100); and/or the second seepage holes (210) are distributed on the pipe wall at two thirds of the upper part of the second drainage pipe (200).

8. The fabricated double-barreled seepage drainage blind ditch of claim 1, wherein: the head and the tail of the first drainage pipe (100) are provided with a socket (121) and a socket (122) which are matched with each other, and the first drainage pipes (100) of two adjacent drainage units are matched and connected through the socket (121) and the socket (122); the second drain pipes (200) of two adjacent drainage units are respectively connected with two ends of the connecting piece (220) by glue.

9. The fabricated double-barreled seepage drainage blind ditch of claim 8, wherein: a cutting ferrule assembly (130) is arranged outside the socket (121), and the cutting ferrule assembly (130) is connected with the bottom of the groove (10) through a soil nail (500); a sealing structure (123) is arranged on the matching surface of the socket (121) and the insertion opening (122), and the sealing structure (123) is preferably a water-swelling sealant.

10. The construction method of the roadbed seepage and drainage structure comprises the following steps:

(1) assembling a drainage unit of the fabricated double-pipe seepage drainage blind ditch according to any one of claims 1 to 9;

(2) a third filter layer (40) is arranged at the bottom and the periphery of the groove (10);

(3) placing the drainage units into a groove (10) and connecting two adjacent drainage units to obtain the assembled double-pipe seepage drainage blind ditch;

(4) tightly connecting the assembled double-pipe seepage and drainage blind ditch with the groove (10);

(5) backfilling the groove (10) until the thickness of the assembled double-pipe seepage and drainage blind ditch is buried reaches more than 15cm, and then fully wrapping the surface of the backfill material by using a third filter layer (40);

(6) the entire trench is filled back further over the third filter layer (40).

Technical Field

The invention relates to the technical field of road seepage and drainage, in particular to an assembled double-pipe seepage and drainage blind ditch and a construction method of a roadbed seepage and drainage structure.

Background

The road is in a strip form and often needs to cross various complex hydrogeological environments, even various climatic environments, and the performance of the road subgrade and pavement can be influenced by factors such as the physical and mechanical properties of soil, landform, stratum conditions, water, temperature and the like. In order to ensure the long-term stability of roads, corresponding counterengineering measures are generally required to be designed in the design of road beds and road surfaces, wherein in order to solve some problems that the strength of road bed filling materials is reduced and filling layers are softened to cause the settlement and deformation of the road beds and further cause the cracking and the damage of the road surface structure and the like caused by the development of underground water, longitudinal blind ditches are generally arranged on two sides of a bed base in a water development area to lead the underground water to be discharged, so that the underground water level in the bed between the blind ditches is reduced, the long-term stability of the road beds and the road surfaces is ensured, and the road traffic.

At present, the road blind ditch is mainly applied to two types of sand-seepage drainage blind ditches and non-sand-seepage drainage blind ditches, wherein the sand-seepage drainage blind ditch mainly comprises a concrete base, a reinforced concrete drainage pipe or culvert, broken stones, permeable geotextile and a reverse filter layer, and the non-sand-seepage drainage blind ditch mainly comprises a common concrete foundation, a concrete wall plate, a reinforced concrete cross brace, a reinforced concrete cover plate and the like. Both of these blind ditches suffer from several disadvantages: (1) the composition materials are various, and the construction process is complicated; (2) the construction speed is slow, the construction period is long, and the construction cost is overhigh; (3) the construction quality is difficult to control, and the water seepage hole is easy to block. With the further advance of road engineering construction in China, the contradiction between design and construction of a road underground drainage structure is increasingly prominent, and a construction unit still has the phenomenon that the construction of the road underground drainage and seepage engineering is not emphasized, so that hidden troubles are brought down for the later structural life and the operation safety of a road subgrade and a pavement.

In order to improve the long-term effect of the seepage and drainage functions of the underground seepage and drainage blind ditches of the roads, some new seepage and drainage blind ditches appear in recent years. For example, chinese utility model patent that publication number is CN202214684U discloses a can wash formula highway drainage french drain dedicated pipe, this dedicated pipe by interior drain pipe, outer drain pipe and pack in outer drain pipe and interior drain pipe between the material of permeating water constitute, this dedicated pipe's advantage lies in can using to take out interior drain pipe after a period and the material of permeating water washs, but does not promote drainage ability substantially, and washs and change process and waste time and energy to interior drain pipe also need bear the soil body load on every side, and high soil body load can cause interior drain pipe and outer drain pipe to damage simultaneously. If chinese utility model patent that publication number is CN207469410U discloses a plastics drainage french drain can plug into again, this french drain adopts neotype plastic filter, compare in the tradition and ooze the drainage french drain, and plastic filter has obtained improving and improving in the aspect of material composition, construction process and quality control, but with high costs, and the promotion effect in the aspect of construction speed and infiltration drainage ability is very little.

Disclosure of Invention

The invention aims to provide an assembled double-pipe seepage and drainage blind ditch to solve the technical problems of poor drainage capacity, short service life and slow construction of blind ditches in the prior art.

The second purpose of the invention is to provide a construction method of a roadbed seepage and drainage structure, which aims to solve the technical problem that the construction speed of the roadbed seepage and drainage structure in the prior art is low.

The third purpose of the invention is to provide a roadbed seepage and drainage structure, which solves the technical problems of poor drainage capability, short service life and slow construction existing in the roadbed seepage and drainage structure in the prior art.

In order to achieve the first object, according to one aspect of the present invention, there is provided an assembled double-pipe seepage drainage blind ditch. This double-barrelled drainage blind ditch that oozes of assembled includes end to end connection's drainage unit, drainage unit includes:

the pipe wall of the first drainage pipe is provided with a first water seepage hole;

the first filtering layer is wrapped outside the first drainage pipe;

the second drain pipe is arranged inside the first drain pipe, and a second water seepage hole is formed in the pipe wall of the second drain pipe;

the second filter layer is wrapped outside the second drain pipe and forms a cavity between the inner wall of the first drain pipe and the second filter layer;

and a first clear liquid obtained by filtering the first filtering layer enters the cavity through the first water seepage holes, and a part of a second clear liquid obtained by filtering the first clear liquid by the second filtering layer enters the inside of the second drain pipe through the second water seepage holes.

Firstly, a cavity between the first drainage pipe and the second filter layer can be used as a drainage channel of the first clear liquid, so that a faster drainage rate is ensured; part of the first clear liquid (the first clear liquid which is contacted with the second water seepage holes because the liquid level in the cavity is higher, or the first clear liquid which is directly dripped from the second water seepage holes) can enter the second drain pipe to be discharged after being filtered by the second filter layer, so that the drainage rate of the blind ditch is always maintained in a stable state. Secondly, because the first drain pipe mainly bears the load of outside soil body, consequently when first drain pipe damages, the second drain pipe can also maintain the drainage ability of french drain to a certain extent. Moreover, when taking place to block up in the cavity, the second drain pipe also can continue the drainage to owing to be equipped with the second filter layer, the second filter layer can carry out further filtration to first clear liquid, consequently gets into the second clear liquid in the second drain pipe and has less precipitate, can prevent to take place to block up in the second drain pipe, thereby ensures that this french drain can effectual drainage for a long time, and life is showing the extension. Therefore, the assembled double-pipe seepage and drainage blind ditch of the invention adopts a double-pipe mode, and improves the drainage capacity and the service life and the length of the seepage and drainage functions of the underground seepage and drainage blind ditch of the road. In conclusion, the assembled double-pipe seepage and drainage blind ditch has a simple structure, can be assembled in a factory in advance and then transported to the site, realizes the idea of assembling all parts, has higher assembling speed and higher efficiency compared with the traditional seepage and drainage blind ditch, needs less labor for assembly, has shorter assembling construction period, lower construction cost and easier quality control, and particularly accords with the development trend of engineering modularization integration at present. The assembled double-pipe seepage and drainage blind ditch can be used for underground drainage of roads, railway subgrades or building foundations, has huge market scale and wide popularization and application prospects.

Further, a support assembly for supporting the first drain pipe and the second drain pipe is arranged in the cavity. From this, make first drain pipe receive supporting component's support on the one hand, can promote the compressive capacity of first drain pipe, on the other hand can retrain the relative position of first drain pipe and second drain pipe, not only maintains the stability of cavity structure, ensures higher drainage rate, can protect the second drain pipe moreover, prevents to cause the influence to the second drain pipe after first drain pipe damages.

Further, the support assembly includes a support structure disposed at a distance, the support structure including:

the support ring is sleeved outside the second filter layer;

the bracing piece, the bracing piece distribute in around the support ring, the one end of bracing piece with the support ring is connected, the other end with the cooperation of first drain pipe inner wall.

From this, the support ring that the hoop set up not only can make first drain pipe and second drain pipe coaxial distribution all the time, promotes the structural stability of french drain, can also support first drain pipe fully.

Further, a gap is formed between the end of the supporting rod and the inner wall of the first drainage pipe. The thickness of this clearance is preferred 1 ~ 3mm, is convenient for like this assemble.

Furthermore, two of the support rods are distributed in the vertical direction. Thereby, the second drain pipe can be supported better.

Further, at least one support rod is fixedly connected with the first drainage pipe. Preferably, screws are used for fastening to prevent rotation of the support assembly.

Further, the longitudinal lengths of the support ring and the support rod are 5-10 cm; the distance between two adjacent supporting structures is 0.3-0.7 m. If the longitudinal lengths of the support ring and the support rod are greater than the above numerical range, the water seepage capability may be affected to a certain extent by covering too many water seepage holes; if the longitudinal lengths of the support ring and the support bar are less than the above numerical range, the stability of the second drain pipe may be affected by an excessive local stress. If the distance between two adjacent support structures is smaller than the numerical range, the water seepage capability may be affected to a certain extent due to the fact that the support structures cover too many water seepage holes; if the distance between two adjacent supporting structures is larger than the numerical range, the supporting effect on the first drainage pipe and the second drainage pipe is influenced.

Further, the first drain pipe is a corrugated pipe; preferably, the first drain pipe is a HDPE double-wall corrugated pipe. The outer wall of the corrugated pipe is of an annular corrugated structure, so that the annular rigidity of the pipe is greatly enhanced, the resistance of the pipeline to the load of the surrounding soil body is enhanced, and the cost is low. The corrugated pipe made of HDPE (high density polyethylene) has the advantages of better low temperature resistance, shock resistance, flexibility, chemical stability and the like than the common corrugated pipe, and has small friction coefficient, light weight and longer service life.

Furthermore, the first filter layer and the second filter layer are filter layers with the interception rate of particulate matters with the granularity of more than or equal to 0.5 mu m of more than or equal to 95 percent; thereby, a higher yield of serum and a lower solids content are ensured to maintain a higher drainage rate and service life. The first filter layer and the second filter layer are preferably water-permeable geotextiles, and more preferably filament geotextiles with better soil conservation, water permeability and clogging resistance.

Furthermore, the first water seepage holes are distributed on the pipe wall at two thirds of the annular position at the upper part of the first drainage pipe; and/or the second seepage holes are distributed on the pipe wall at two thirds of the annular upper part of the second drainage pipe. The number and distribution range of the water seepage holes directly influence the water seepage and drainage capacity of the blind ditch; if the arrangement of the water seepage holes exceeds the range, the drainage channel of the first clear liquid in the cavity is too small, so that the first clear liquid can not be discharged in time and flows reversely in the section without underground water; if the arrangement of the water seepage holes is smaller than the range, water around the blind ditch cannot be drained in time, so that the stability of the roadbed structure is affected. It can be seen that the above arrangement can maximize the drainage capacity.

Furthermore, a socket and a spigot which are matched with each other are arranged at the head and the tail of the first drainage pipe, and the first drainage pipes of two adjacent drainage units are matched and connected through the socket and the spigot; and the second drain pipes of two adjacent drainage units are respectively connected with the two ends of the connecting piece by viscose glue. Therefore, two adjacent drainage units can be quickly and efficiently fastened and connected. Preferably, a sealing structure is arranged on the matching surface of the socket and the faucet, and the sealing structure is preferably a sealant which swells in water so as to prevent the first clear liquid from flowing out of the first drainage pipe from the joint. When the first drainage pipe is a corrugated pipe, the grooves and the bulges on the outer part of the corrugated pipe are distributed at intervals, so that the sealant can be coated in the grooves on the socket, and the best sealing effect can be achieved.

Furthermore, a clamping sleeve assembly is arranged outside the socket and connected with the bottom of the groove through a soil nail. Thereby, the blind groove is stably mounted in the groove.

In order to achieve the first object, according to another aspect of the present invention, there is provided an assembled double-pipe seepage drainage blind ditch. This double-barrelled drainage blind ditch that oozes of assembled includes end to end connection's drainage unit, drainage unit includes:

the pipe wall of the first drainage pipe is provided with a first water seepage hole;

the first filtering layer is arranged outside the first drainage pipe;

the second drain pipe is arranged inside the first drain pipe, and a second water seepage hole is formed in the pipe wall of the second drain pipe;

the second filter layer is arranged outside the second drain pipe and forms a cavity between the inner wall of the first drain pipe and the second filter layer;

the supporting assembly is arranged in the cavity and supports the first drainage pipe and the second drainage pipe;

and a first clear liquid obtained by filtering the first filtering layer enters the cavity through the first water seepage holes, and a part of a second clear liquid obtained by filtering the first clear liquid by the second filtering layer enters the inside of the second drain pipe through the second water seepage holes.

Firstly, a cavity between the first drainage pipe and the second filter layer can be used as a drainage channel of the first clear liquid, so that a faster drainage rate is ensured; part of the first clear liquid (the first clear liquid which is contacted with the second water seepage holes because the liquid level in the cavity is higher, or the first clear liquid which is directly dripped from the second water seepage holes) can enter the second drain pipe to be discharged after being filtered by the second filter layer, so that the drainage rate of the blind ditch is always maintained in a stable state. Secondly, because the first drain pipe mainly bears the load of outside soil body, consequently when first drain pipe damages, the second drain pipe can also maintain the drainage ability of french drain to a certain extent. Moreover, when taking place to block up in the cavity, the second drain pipe also can continue the drainage to owing to be equipped with the second filter layer, the second filter layer can carry out further filtration to first clear liquid, consequently gets into the second clear liquid in the second drain pipe and has less precipitate, can prevent to take place to block up in the second drain pipe, thereby ensures that this french drain can effectual drainage for a long time, and life is showing the extension. Therefore, the assembled double-pipe seepage and drainage blind ditch of the invention adopts a double-pipe mode, and improves the drainage capacity and the service life and the length of the seepage and drainage functions of the underground seepage and drainage blind ditch of the road. Through setting up supporting component, make first drain pipe receive supporting component's support on the one hand, can promote the compressive capacity of first drain pipe, on the other hand can retrain the relative position of first drain pipe and second drain pipe, not only maintains the stability of cavity structure, ensures higher drainage rate, can protect the second drain pipe moreover, prevents that first drain pipe from damaging the back and leading to the fact the influence to the second drain pipe. In conclusion, the assembled double-pipe seepage and drainage blind ditch has a simple structure, can be assembled in a factory in advance and then transported to the site, realizes the idea of assembling all parts, has higher assembling speed and higher efficiency compared with the traditional seepage and drainage blind ditch, needs less labor for assembly, has shorter assembling construction period, lower construction cost and easier quality control, and particularly accords with the development trend of engineering modularization integration at present. The assembled double-pipe seepage and drainage blind ditch can be used for underground drainage of roads, railway subgrades or building foundations, has huge market scale and wide popularization and application prospects.

Further, the support assembly includes a support structure disposed at a distance, the support structure including:

the support ring is sleeved outside the second filter layer;

the bracing piece, the bracing piece distribute in around the support ring, the one end of bracing piece with the support ring is connected, the other end with first drain pipe is connected.

From this, the support ring that the hoop set up not only can make first drain pipe and second drain pipe coaxial distribution all the time, promotes the structural stability of french drain, can also support first drain pipe and second drain pipe fully.

Further, a gap is formed between the end of the supporting rod and the inner wall of the first drainage pipe. The thickness of this clearance is preferred 1 ~ 3mm, is convenient for like this assemble.

Furthermore, two of the support rods are distributed in the vertical direction. Thereby, the second drain pipe can be supported better.

Further, at least one support rod is fixedly connected with the first drainage pipe. Preferably, screws are used for fastening to prevent rotation of the support assembly.

Further, the longitudinal lengths of the support ring and the support rod are 5-10 cm; the distance between two adjacent supporting structures is 0.3-0.7 m. If the longitudinal lengths of the support rings and the support rods are greater than the above numerical range, the drainage capacity may be affected to some extent by covering too many water seepage holes; if the longitudinal lengths of the support ring and the support bar are less than the above value range, the service life of the first and second drain pipes may be affected by an excessive local stress. If the distance between two adjacent support structures is smaller than the above numerical range, the drainage capacity may be affected to some extent by covering too many water seepage holes; if the distance between two adjacent supporting structures is larger than the numerical range, the supporting effect on the first drainage pipe is influenced.

Further, the first drain pipe is an HDPE double-wall corrugated pipe; the second drain pipe is a PVC pipe. Because what mainly bore the load of surrounding soil body is first drain pipe, therefore the HDPE double-walled bellows that the drain pipe selected the compressive capacity stronger is with increase of service life, and the second drain pipe receives the protection of first drain pipe, need not to bear high load, consequently can select low-cost PVC (polyvinyl chloride) pipe, and is visible, and the combination of HDPE double-walled bellows and PVC pipe can make this french drain have low-cost and long-life concurrently.

Further, the first filter layer and the second filter layer are water-permeable geotextiles. The water-permeable geotextile is preferably a filament geotextile with better soil conservation, water permeability and silt prevention.

Furthermore, the first water seepage holes are distributed on the pipe wall at two thirds of the annular position at the upper part of the first drainage pipe; and/or the second seepage holes are distributed on the pipe wall at two thirds of the annular upper part of the second drainage pipe. The number and distribution range of the water seepage holes directly influence the water seepage and drainage capacity of the blind ditch; if the arrangement of the water seepage holes exceeds the range, the drainage channel of the first clear liquid in the cavity is too small, so that the first clear liquid can not be discharged in time and flows reversely in the section without underground water; if the arrangement of the water seepage holes is smaller than the range, water around the blind ditch cannot be drained in time, so that the stability of the roadbed structure is affected. It can be seen that the above arrangement can maximize the drainage capacity.

Furthermore, a socket and a spigot which are matched with each other are arranged at the head and the tail of the first drainage pipe, and the first drainage pipes of two adjacent drainage units are matched and connected through the socket and the spigot. Therefore, two adjacent drainage units can be quickly and efficiently fastened and connected. Preferably, a sealing structure is arranged on the matching surface of the socket and the spigot, and the sealing structure is preferably a sealant which swells in water so as to prevent first clear liquid from flowing out of the first drainage pipe from the joint or prevent sewage from entering the cavity from the joint.

Furthermore, a clamping sleeve assembly is arranged outside the socket and connected with the bottom of the groove through a soil nail. Thereby, the blind groove is stably mounted in the groove.

Furthermore, a connection piece is arranged at the joint of second drain pipes of two adjacent drain units, and the second drain pipes are connected with the connection piece through viscose. Therefore, two adjacent drainage units can be quickly and efficiently fastened and connected.

In order to achieve the second object, the invention provides a construction method of a roadbed seepage and drainage structure. The construction method comprises the following steps:

(1) assembling the drainage unit of any one of the assembled double-pipe seepage and drainage blind ditches;

(2) mounting third filter layers at the bottom and around the groove;

(3) placing the drainage units into a groove and connecting two adjacent drainage units to obtain the assembled double-pipe seepage drainage blind ditch;

(4) tightly connecting the assembled double-pipe seepage and drainage blind ditch with the groove;

(5) backfilling the groove until the thickness of the assembled double-pipe seepage and drainage blind ditch is buried reaches more than 15cm, and then fully wrapping the surface of a backfill object by using a third filter layer;

(6) the entire trench continues to be backfilled above the third filter layer.

Therefore, the drainage units can be assembled in advance in a factory and then transported to the site, the drainage units can be quickly connected and installed on the site, the idea of assembling all components is realized, compared with the traditional seepage drainage blind ditch, the assembly speed is higher, the assembly efficiency is higher, less labor is needed for assembly, the assembly construction period is shorter, the construction cost is lower, the quality is easier to control, and the development trend of engineering modularization integration at present is particularly met.

In order to achieve the third object, the present invention provides a roadbed infiltration and drainage structure. The structure includes:

the blind ditch is any one of the assembled double-pipe seepage and drainage blind ditches, and is arranged at the bottom of the groove;

the first backfill layer is positioned around the blind ditch, and the backfill height is higher than the height of the blind ditch by more than 15 cm;

a third filter layer positioned around the first backfill layer;

a second backfill layer above the first backfill layer and having a backfill height matching the trench height.

Therefore, based on various advantages of the assembled double-pipe seepage and drainage blind ditch, the roadbed seepage and drainage structure has the advantages of good drainage capacity, long service life and quick installation.

The invention is further described with reference to the following figures and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:

FIG. 1 is a schematic cross-sectional view of a drainage unit of an assembled double-pipe seepage drainage blind ditch of the present invention.

Fig. 2 is a partially disassembled cross-sectional view of the drainage unit of the assembled double-pipe seepage drainage blind ditch of the invention on the basis of fig. 1.

Fig. 3 is a front view of a drainage unit of the fabricated double-barreled seepage drainage blind ditch of the present invention in the direction of a in fig. 2.

Fig. 4 is a schematic structural diagram of a cutting sleeve assembly of a drainage unit of the assembled double-pipe seepage drainage blind ditch.

Fig. 5 is a partially disassembled cross-sectional view of the drainage unit of the assembled double-pipe seepage drainage blind ditch of the invention on the basis of fig. 2.

Fig. 6 is a front view of a drainage unit of the fabricated double-barreled seepage drainage blind ditch of the present invention in the direction of B in fig. 5.

Fig. 7 is a partially disassembled cross-sectional view of the drainage unit of the fabricated double-pipe seepage drainage blind ditch of the invention on the basis of fig. 5.

Fig. 8 is a front view of a drainage unit of the fabricated double-barreled seepage drainage blind ditch of the present invention in the direction of C in fig. 7.

FIG. 9 is a schematic structural view of a support assembly of a drainage unit of an assembled double-pipe seepage drainage blind ditch according to the present invention.

Fig. 10 is a schematic structural view of a roadbed drainage structure.

The relevant references in the above figures are:

100-a first drainage pipe, 110-a first water seepage hole, 121-a socket, 122-a socket, 123-a sealing structure, 130-a clamping sleeve component, 131-a fixing ring, 132-a bolt, 133-a nut, 134-an L-shaped connecting rod, 140-a groove, 200-a second drainage pipe, 210-a second water seepage hole, 220-a connector, 310-a first filter layer, 320-a second filter layer, 400-a support component, 410-a support ring, 420-a support rod, 500-a soil nail, 10-a groove, 20-a blind ditch, 30-a first backfill layer, 40-a third filter layer and 50-a second backfill layer.

Detailed Description

The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that:

the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.

Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.

With respect to terms and units in the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.