阅读说明：本技术 一种高挡土墙防淤堵的排水结构及其施工方法 (Anti-clogging drainage structure for high retaining wall and construction method thereof ) 是由 王威 刘顺青 姜啸 吴礼浩 崔雨 方龙建 于 2021-09-06 设计创作，主要内容包括：本发明提供一种高挡土墙防淤堵的排水结构及施工方法,包括高挡土墙,高挡土墙内预埋有若干排水管,排水管连通高挡土墙的两侧；排水管的进水口设置有过滤组件,过滤组件的一端与高挡土墙外连通,过滤组件的另一端与排水管连通；最下层的过滤组件的下方设有隔水层；过滤组件包括沿水流方向依次设置的过滤布、反滤装置和隔离网,反滤装置插接在排水管内,隔离网与反滤装置固接。本发明结构简单稳定,极大地降低了传统高挡土墙排水结构施工时的人材机投入,使用方便,减小了施工难度,保证高挡土墙排水结构施工质量,提高挡土墙排水结构及墙后填土回填施工效率,极大地提高了施工效率,节约工期,具有较高的推广价值。(The invention provides a silt-blocking-preventing drainage structure of a high retaining wall and a construction method, wherein the silt-blocking-preventing drainage structure comprises the high retaining wall, wherein a plurality of drainage pipes are pre-embedded in the high retaining wall and communicated with two sides of the high retaining wall; a water inlet of the water drainage pipe is provided with a filtering assembly, one end of the filtering assembly is communicated with the outside of the high soil retaining wall, and the other end of the filtering assembly is communicated with the water drainage pipe; a water-resisting layer is arranged below the filtering component at the lowest layer; the filter assembly comprises a filter cloth, an inverse filter device and an isolation net which are sequentially arranged along the water flow direction, the inverse filter device is inserted in the drain pipe, and the isolation net is fixedly connected with the inverse filter device. The high-retaining wall drainage structure has a simple and stable structure, greatly reduces the investment of manpower and machines in the construction of the traditional high-retaining wall drainage structure, is convenient to use, reduces the construction difficulty, ensures the construction quality of the high-retaining wall drainage structure, improves the construction efficiency of the retaining wall drainage structure and the backfilling construction of soil behind the wall, greatly improves the construction efficiency, saves the construction period and has higher popularization value.)

1. The utility model provides a stifled drainage structures of silt is prevented to high retaining wall, includes high retaining wall (1), its characterized in that: a plurality of drain pipes (2) are pre-buried in the high soil retaining wall (1), the drain pipes (2) are arranged in the high soil retaining wall (1) in an array mode, and the drain pipes (2) are communicated with two sides of the high soil retaining wall (1);

a water inlet of the water drainage pipe (2) is provided with a filtering assembly, one end of the filtering assembly is communicated with the outside of the high soil retaining wall (1), and the other end of the filtering assembly is communicated with the water drainage pipe (2); a water-resisting layer (10) is arranged below the lowest filtering component;

the filter assembly comprises a filter cloth (3), an inverse filter device (4) and an isolation net (5) which are sequentially arranged along the water flow direction, the inverse filter device (4) is inserted into the drain pipe (2), and the isolation net (5) is fixedly connected with the inverse filter device (4).

2. The anti-clogging drainage structure for high retaining walls according to claim 1, wherein: the drain pipe (2) is obliquely arranged along the drainage direction, a water inlet of the drain pipe (2) is higher than a water outlet in the drain pipe (2), and the inclination angle of the drain pipe (2) is not less than 5 degrees; the outlet of the drain pipe (2) at the lowest layer is not less than 20cm higher than the ground.

3. The anti-clogging drainage structure for high retaining walls according to claim 1, wherein: the reverse filtering device (4) comprises a small-diameter section (401), a transition section (402) and an expanding section (403) which are sequentially connected, the small-diameter section (401) is inserted into an inlet of the drainage pipe (2), and the outer diameter of the small-diameter section (401) is matched with the inner diameter of the drainage pipe (2); the isolation net (5) is fixedly connected with the small-diameter section (401); the diameter expanding section (403) and the transition section (402) are filled with filler (6), and the filter cloth (3) covers the inlet of the diameter expanding section (403).

4. The anti-clogging drainage structure for high retaining walls according to claim 3, wherein: the filler (6) comprises but is not limited to a mixture of crushed stones and water-absorbing sponge.

5. The anti-clogging drainage structure for high retaining walls according to claim 4, wherein: the filter cloth (3) comprises a plurality of layers of geotextiles (301) which are sequentially stacked, the geotextiles (301) cover the inlet of the diameter expanding section (403), and the geotextiles (301) are bound outside the diameter expanding section (403) through binding wires (302); the number of layers of the geotextile (301) is not less than two.

6. The anti-clogging drainage structure for high retaining walls according to claim 5, wherein: the isolation net (5) comprises two layers which are fixedly connected with two ends of the small-diameter section (401) respectively.

7. A construction method of an anti-clogging drainage structure for a high retaining wall according to any one of claims 1 to 6, comprising the following construction steps:

s1, excavating a foundation pit (7), cleaning miscellaneous soil of the foundation pit (7) and tamping;

s2, constructing the high retaining wall (1) to be higher than the foundation (8), and then backfilling the foundation pit (7) and tamping;

s3, pre-burying the drain pipe (2), then backfilling wall back soil (9), and tamping;

s4, constructing a water-resisting layer (10) to the drain pipe (2) at the lowest layer, then installing a reverse filtering device (4), filling a filler (6) into the reverse filtering device (4), and finally installing a filter cloth (3);

and S5, backfilling the soil (9) behind the wall layer by layer and tamping until the designed elevation is reached.

8. The construction method of the anti-clogging drainage structure for the high retaining wall according to claim 7, wherein: in the step S1, the length of the foundation pit (7) excavated each time is not more than 20% of the total construction length, and the excavation length of each time is not more than 6 m.

9. The construction method of the anti-clogging drainage structure for the high retaining wall according to claim 7, wherein: in the step S3, the strength of the backfilled soil (9) behind the retaining wall (1) needs to be higher than 75% of the design strength, and the transverse slope of the soil behind the retaining wall (9) is not less than 3%.

10. The construction method of the anti-clogging drainage structure for the high retaining wall according to claim 7, wherein: in the step S5, the thickness of each layer of wall back soil (9) is not more than 20 cm.

Technical Field

The invention relates to the technical field of drainage structures and construction of retaining walls, in particular to a silt-blocking-preventing drainage structure of a high retaining wall and a construction method thereof.

Background

The retaining wall is widely applied to engineering construction such as water conservancy, traffic, ports, industrial and civil construction and the like as a common retaining structure, and aims to support the retaining wall to back fill soil or side slope soil and prevent deformation instability of the soil. After rainfall infiltration at every turn, the retaining wall inevitably receives the effect of water pressure behind the wall, all is equipped with the wash port during consequently all retaining wall designs, for the drain pipe is unobstructed, need set up the anti-device of straining in retaining wall wash port department.

In actual engineering, the drainage holes behind the retaining wall often have soil running or failure phenomena due to various reasons. The occurrence of the soil flowing phenomenon can cause the loss of the filler behind the wall, thereby causing the uneven settlement of the filling soil on the back of the wall; after the drainage holes are invalid, the earth water pressure behind the wall is increased, so that the slip or overturn damage of the retaining wall is easily caused, and the stability of the wall back filling or the slope soil body is further influenced. The main possibilities of the failure of the drain hole of the retaining wall are two, namely that the drain pipe is blocked by the filler or the filter material behind the wall, so that the drainage is not smooth, and the hole of the filter facility behind the drain pipe is blocked by fine soil particles, so that the water permeation effect is reduced.

At present, when the retaining wall is high, anti-filter bags are arranged at intervals at the water inlet of the drain hole along the vertical direction of the wall back to serve as a drainage structure, however, anti-filter materials in the anti-filter bags need to be laid layer by layer during construction, and the construction procedure is complex. Meanwhile, the reverse filter bag is easy to impact during backfill behind the wall, so that the geotextile at the outermost layer of the reverse filter bag is buckled and deformed, and the reverse filter effect is difficult to ensure.

Through the analysis, in order to ensure that the high retaining wall and the wall back filling thereof or the side slope soil body in the actual engineering keep normal operation, how to invent the drainage structure which can effectively prevent silting and is easy to construct is very important.

Disclosure of Invention

The invention aims to provide various anti-clogging drainage structures for high retaining walls and a construction method thereof, so as to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a silt-blocking-preventing drainage structure of a high soil retaining wall, which comprises the high soil retaining wall, wherein a plurality of drainage pipes are pre-embedded in the high soil retaining wall, are arranged in an array in the high soil retaining wall, and are communicated with two sides of the high soil retaining wall;

a water inlet of the water drainage pipe is provided with a filtering assembly, one end of the filtering assembly is communicated with the outside of the high soil retaining wall, and the other end of the filtering assembly is communicated with the water drainage pipe; a water-resisting layer is arranged below the filtering component at the lowest layer;

the filter assembly comprises filter cloth, an inverse filter device and an isolation net which are sequentially arranged along the water flow direction, the inverse filter device is inserted in the drainage pipe, and the isolation net is fixedly connected with the inverse filter device.

Preferably, the drain pipe is obliquely arranged along the drainage direction, a water inlet of the drain pipe is higher than a water outlet of the drain pipe, and the inclination angle of the drain pipe is not less than 5 degrees; the outlet of the drain pipe at the lowest layer is not less than 20cm higher than the ground.

Preferably, the reverse filter device comprises a small-diameter section, a transition section and an expanding section which are sequentially connected, the small-diameter section is inserted into an inlet of the drain pipe, and the outer diameter of the small-diameter section is matched with the inner diameter of the drain pipe; the isolation net is fixedly connected with the small-diameter section; the diameter expanding section and the transition section are filled with fillers, and the filter cloth covers the inlet of the diameter expanding section.

Preferably, the filler includes, but is not limited to, a mixture of crushed stone and water-absorbing sponge.

Preferably, the filter cloth comprises a plurality of layers of geotextiles which are sequentially stacked, the geotextile covers the inlet of the diameter expanding section, and the geotextile is bound outside the diameter expanding section through binding wires; the number of layers of the geotextile is not less than two.

Preferably, the separation net comprises two layers which are fixedly connected with two ends of the small-diameter section respectively.

A construction method of an anti-clogging drainage structure of a high retaining wall comprises the following construction steps:

s1, excavating a foundation pit, cleaning miscellaneous soil of the foundation pit, and tamping;

s2, constructing the high retaining wall to be higher than the foundation, and then backfilling and tamping the foundation pit;

s3, pre-burying a drain pipe, then backfilling wall back soil, and tamping;

s4, constructing a water-resisting layer to the lowest drainage pipe, then installing a reverse filtering device, filling filler into the reverse filtering device, and finally installing filter cloth;

and S5, backfilling the soil behind the wall layer by layer and tamping until the designed elevation is reached.

Preferably, in step S1, the length of the foundation pit excavated each time is not more than 20% of the total construction length, and the excavated length of the foundation pit excavated each time is not more than 6 m.

Preferably, the strength of the high retaining wall is required to be more than 75% of the design strength when the soil behind the wall is backfilled in the step S3, and the cross slope is set on the soil behind the wall to be not less than 3%.

Preferably, in step S5, the thickness of each layer of soil behind the wall is not more than 20 cm.

The invention discloses the following technical effects: the invention discloses an anti-clogging drainage structure of a high retaining wall and a construction method thereof, and compared with the prior art, the invention has the following advantages:

(1) the high retaining wall drainage structure is simple and stable in structure, the investment of manpower and machines in the construction of the traditional high retaining wall drainage structure is greatly reduced, the construction quality of the high retaining wall drainage structure is ensured, and the construction efficiency of the retaining wall drainage structure and the backfilling construction efficiency of the soil filled behind the wall are improved.

(2) The reverse filtering device is filled with filler, and the inlet is provided with the isolating cloth, so that the filtering effect is improved, and the probability of blockage of the drain pipe is reduced; when the filler provides a drainage channel for the soil behind the wall, the soil behind the wall is effectively prevented from being taken away during drainage, the soil body stability of the soil behind the wall is ensured, and simultaneously, silt is prevented from entering the drainage pipe to cause blockage.

(3) The reverse filtering device can be prefabricated in advance, can be produced in a factory, is high in quality controllability, only needs to be embedded on site during construction, is convenient to use, reduces construction difficulty, greatly improves construction efficiency and saves construction period.

The high-retaining wall drainage structure has a simple and stable structure, greatly reduces the investment of manpower and machines in the construction of the traditional high-retaining wall drainage structure, is convenient to use, reduces the construction difficulty, ensures the construction quality of the high-retaining wall drainage structure, improves the construction efficiency of the retaining wall drainage structure and the backfilling construction of soil behind the wall, greatly improves the construction efficiency, saves the construction period and has higher popularization value.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a side view of the anti-fouling drainage structure for a high retaining wall of the present invention;

FIG. 2 is a schematic structural view of an anti-clogging drainage structure for a high retaining wall according to the present invention;

FIG. 3 is a front view of the high retaining wall drain pipe of the present invention;

FIG. 4 is a three-dimensional view of the reverse filtering apparatus of the present invention;

FIG. 5 is a schematic structural view of the reverse filtering apparatus of the present invention;

wherein, 1, a high retaining wall; 2. a drain pipe; 3. a filter cloth; 301. geotextile; 302. binding wires; 4. a reverse filtration device; 401. a small diameter section; 402. a transition section; 403. a diameter expanding section; 5. an isolation net; 6. a filler; 7. a foundation pit; 8. a foundation; 9. soil behind the wall; 10. a water barrier layer; 11. and (4) running water slope.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1-5, the invention provides an anti-clogging drainage structure for a high soil retaining wall, which comprises a high soil retaining wall 1, wherein a plurality of drainage pipes 2 are pre-embedded in the high soil retaining wall 1, the drainage pipes 2 are arranged in an array manner in the high soil retaining wall 1, and the drainage pipes 2 are communicated with two sides of the high soil retaining wall 1;

a water inlet of the water drainage pipe 2 is provided with a filtering assembly, one end of the filtering assembly is communicated with the outside of the high soil retaining wall 1, and the other end of the filtering assembly is communicated with the water drainage pipe 2; a water-resisting layer 10 is arranged below the filtering component at the lowest layer;

the filter assembly comprises a filter cloth 3, an inverse filter device 4 and an isolation net 5 which are sequentially arranged along the water flow direction, the inverse filter device 4 is inserted in the water discharge pipe 2, and the isolation net 5 is fixedly connected with the inverse filter device 4. Ponding behind the high retaining wall 1 loops through behind filter cloth 3, the anti-device of straining 4 and the separation net 5 and gets into drain pipe 2, finally arranges the opposite side of high retaining wall 1, prevents ponding behind the high retaining wall 1, and filter cloth 3 and anti-device of straining 4 carry out the multiple layer filtering to the drainage, can prevent that silt behind the high retaining wall 1 from getting into drain pipe 2 and causing the jam.

According to the further optimized scheme, the drain pipe 2 is obliquely arranged along the drainage direction, the water inlet of the drain pipe 2 is higher than the water outlet in the drain pipe 2, and the inclination angle of the drain pipe 2 is not less than 5 degrees; the outlet of the drain pipe 2 at the lowest layer is not less than 20cm higher than the ground. The drain pipes 2 are round PVC pipes, have good corrosion resistance and ageing resistance, are long in service life, are drainage channels filled with earth behind walls, have the diameter of 100-150 mm, the level and the vertical spacing of the holes of the adjacent drain pipes 2 are 2-3 m, the inclination angle is 5%, the quincunx is arranged, the water outlet of the PVC drain pipe 2 at the bottom is higher than the ground by more than 20cm, the drainage is facilitated, and the water outlet is prevented from being excessively low to cause drainage siltation to influence the drainage.

In a further optimized scheme, the reverse filtering device 4 comprises a small-diameter section 401, a transition section 402 and an expanding section 403 which are sequentially connected, the small-diameter section 401 is inserted into an inlet of the drain pipe 2, and the outer diameter of the small-diameter section 401 is matched with the inner diameter of the drain pipe 2; the isolation net 5 is fixedly connected with the small-diameter section 401; the diameter expanding section 403 and the transition section 402 are filled with filler 6, and the filter cloth 3 covers the inlet of the diameter expanding section 403. The small-diameter section 401, the transition section 402 and the diameter expanding section 403 are fixedly connected in sequence, the outer diameter of the small-diameter section 401 is matched with the inner diameter of the drain pipe 2, the small-diameter section 401 is embedded in the drain pipe 2 during installation, the installation is convenient, and water can be effectively prevented from leaking from the base surfaces of the drain pipe 2 and the small-diameter section 401; the diameter of the expanding section 403 is 2 times of that of the small-diameter section 401; filler 6 and filter cloth 3 can carry out a lot of to the drainage that gets into anti-device 4 of straining and filter, prevent that the grit in the drainage from getting into drain pipe 2 and leading to drain pipe 2 to block up.

Further, the reverse filtering device 4 is an integral casting and forging piece which is integrally formed, and the material of the reverse filtering device is preferably stainless steel.

According to the further optimization scheme, the filler 6 comprises a mixture of, but not limited to, broken stones and water absorption sponges, the diameter of the broken stones is not smaller than that of the separation net 5, the broken stones are prevented from leaking from holes of the separation net 5 and entering the drain pipe 2, the water absorption sponges fill gaps of the broken stones, fine silt is prevented from entering the drain pipe 2 through the gaps of the broken stones, and the integrity of the filler 6 is improved.

Further, the water-absorbing sponge and the crushed stones are put into the preservative solution to be soaked for 7-10 days before being mixed, and then the mixture is taken out, extruded out and dried; the diameter of the crushed stone is not less than the aperture of the separation net 5. The purpose of soaking with the preservative solution is to destroy fungi and other seeds in the crushed stones and the water-absorbing sponge, prevent the fungi and seeds from germinating to cause rhizomes to block the drain pipe 2 and the reverse filtering device 4, and simultaneously prevent the filler 6 from smelling and corroding.

Furthermore, the particle size of the crushed stone is 18-22 mm, the length and width of the water-absorbing sponge are 40mm, the thickness of the water-absorbing sponge is 10mm, and the mass of the water-absorbing sponge in the same reverse filtering device 4 accounts for 3% of the mass of the mixture of the crushed stone and the water-absorbing sponge.

According to a further optimized scheme, the filter cloth 3 comprises a plurality of layers of geotextiles 301 which are sequentially stacked, the geotextiles 301 cover the inlet of the diameter expanding section 403, and the geotextiles 301 are bound outside the diameter expanding section 403 through binding wires 302; the number of layers of the geotextile 301 is not less than two. The geotextile 301 is used as the first layer of the inlet of the reverse filtering device 4 for filtering, and is bound at the inlet of the diameter expansion section 403 of the reverse filtering device 4 by using the binding wire 302, so that the silt in the drainage is preliminarily isolated outside the reverse filtering device 4; the binding wire 302 can be selected from but not limited to lead wire, stainless steel wire and other metal wires with high corrosion resistance and high strength; the binding wires 302 tighten the geotextile 301, so that the geotextile 301 is not easy to shift and fold, and the later drainage effect is not influenced.

In a further optimized scheme, the isolation net 5 comprises two layers which are fixedly connected with two ends of the small-diameter section 401 respectively. The separation net 5 is used for intercepting the broken stones in the filler 6 and preventing the broken stones from entering the drain pipe 2 to cause blockage.

Further, the isolation net 5 is a stainless steel net, the mesh number of the isolation net 5 is not less than 5 meshes, in order to facilitate installation of the isolation net 5, edge covering processing is carried out on the stainless steel net, and the width of the edge covering is 10 mm.

A construction method of an anti-clogging drainage structure of a high retaining wall comprises the following construction steps:

s1, excavating the foundation pit 7, then clearing the miscellaneous soil of the foundation pit 7, and tamping; excavating the foundation pit 7 to the designed depth, then removing the floating soil and the broken stones at the bottom of the foundation pit 7, then tamping the bottom of the foundation pit 7, removing the floating soil with poor supporting force and tamping, preventing the foundation pit 7 from sinking and collapsing, and improving the bearing capacity of the foundation pit 7.

S2, constructing the high retaining wall 1 to be higher than the foundation 8, and then backfilling the foundation pit 7 and tamping; when the high retaining wall 1 is constructed to the mounting position of the drain pipe 2 which is higher than the foundation 8 but lower than the designed lowest end, the foundation pit 7 is backfilled to be level with the foundation 8 and tamped, an outward flowing water slope 11 which is not less than 5% is made, the drainage is prevented from silting at the backfilled foundation pit 7, and the drainage is facilitated.

S3, pre-burying the drain pipe 2, then backfilling wall back soil 9, and tamping; and after backfilling the foundation pit 7, continuously constructing the high retaining wall 1, and pre-burying the drain pipe 2 according to the designed position. The arrangement position of the drain pipes 2 can be controlled more conveniently by the aid of the pre-buried drain pipes 2, arrangement sequence and density can be adjusted conveniently, meanwhile, the drain pipes 2 and the high soil retaining wall 1 are combined more tightly, and water leakage is avoided.

S4, constructing a water-resisting layer 10 to the lowest drainage pipe 2, then installing a reverse filtering device 4, filling the filler 6 into the reverse filtering device 4, and finally installing a filter cloth 3; the waterproof layer 10 is made of clay with poor water permeability, the rammed thickness is not less than 30cm, and accumulated water is prevented from permeating the foundation pit 7 and the lower part of the high water retaining wall, so that the strength and the bearing capacity of the foundation pit 7 are reduced, and the foundation pit 7 is prevented from collapsing; the reverse filtering device 4 is directly inserted into the drainage, so that the lower edge of the reverse filtering device 4 is close to the top surface of the water-resisting layer 10, the drainage is convenient, and the water-resisting layer 10 is prevented from losing efficacy due to water accumulation on the water-resisting layer 10; when the reverse filter device 4 is installed, the small-diameter section 401 of the reverse filter device 4 is embedded in the drain pipe 2, the prepared filler 6 is uniformly placed into the diameter-expanding section 403 and the transition section 402 of the stainless steel reverse filter device 4, the port part of the diameter-expanding section 403 is wrapped with the geotextile 301, and the geotextile 301 is bound and fixed by the binding wire 302 after being wrapped.

And S5, backfilling the wall back soil 9 layer by layer and tamping until the design elevation is reached. The wall back soil 9 is backfilled layer by layer, and the next layer is backfilled after each layer is tamped, so that the wall back soil 9 can be tamped more fully, the situation that the wall back soil 9 at the lowest end cannot be tamped effectively after being refilled in sequence is prevented, the bearing property is poor, and water and soil loss is easy to occur; the bottom surface of the soil 9 behind each layer of wall is pressed close to the edge of the anti-filter device 4 of one layer, and the soil 9 behind each layer of wall is drained, so that the drainage efficiency and effect are improved.

In a further optimization scheme, in step S2, the length of each excavation of the foundation pit 7 is not more than 20% of the total construction length, and the length of each excavation is not more than 6 m. The purpose of the section-by-section construction is to prevent the intensity of the foundation 8 from being reduced to seriously cause collapse and landslide after the length of one-time excavation is too long, and simultaneously prevent the foundation pit 7 from being soaked in water to soften the bottom layer and reduce the supporting force in the construction process in severe weather.

Further optimizing the scheme, in the step S3, the strength of the backfilled wall back soil required by the high retaining wall reaches over 75% of the design strength, and the wall back soil is provided with a cross slope not less than 3%; when the wall strength of the high retaining wall 1 reaches over 75% of the design strength, backfilling the wall back soil 9, preventing the wall back soil 9 from pressing and deforming the high retaining wall 1, uniformly paving and leveling the high retaining wall during filling, arranging a cross slope not less than 3%, facilitating drainage, and rolling the high retaining wall by using a small compactor when the filling distance is 0.5-1.0 m away from the wall back.

In a further optimization scheme, in step S5, the thickness of each layer of wall back soil 9 is not more than 20 cm. Backfilling layer by layer and tamping, wherein the top surface of each layer of wall back soil 9 is filled below the reverse filtering device 4, so that the drainage of each layer of wall back soil 9 is facilitated.

The construction method comprises the following steps:

designing the position and height of the high retaining wall 1 according to the requirement and in combination with the terrain, then excavating a foundation pit 7 on a foundation 8 to the designed depth according to the design, removing floating soil and gravels at the bottom of the foundation pit 7, and then tamping.

And constructing the high soil retaining wall 1 according to design requirements until the height of the high soil retaining wall 1 is higher than the foundation 8 but lower than the height of the designed lowest drainage pipe 2, then backfilling a foundation pit 7 to bury and tamp the lower part of the high soil retaining wall 1, and making an outward flowing water slope 11 of which the content is not less than 5% on the outer side of the wall surface of the high-grade soil wall.

After the foundation pit 7 is backfilled, the construction of the high retaining wall 1 is continued, and a preset number of drain pipes 2 are pre-buried according to the designed positions until the construction of the high retaining wall 1 is completed; when the wall strength of the high retaining wall 1 reaches over 75 percent of the design strength, backfilling the soil 9 behind the wall, uniformly paving and leveling the soil during filling, arranging a cross slope with the thickness not less than 3 percent, and rolling the soil when the filled soil is 0.5-1.0 m away from the wall back by adopting a small compaction machine.

Tamping a water-resisting layer 10 with the thickness not less than 30cm on a foundation 8 behind the high retaining wall 1 by clay with poor water permeability, wherein the top surface of the water-resisting layer 10 is close to the drain pipe 2 at the lowest end; then the reverse filter device 4 is installed, when the reverse filter device 4 is installed, the small diameter section 401 of the reverse filter device 4 is embedded in the drain pipe 2, the prepared filler 6 is uniformly placed into the diameter expanding section 403 and the transition section 402 of the stainless steel reverse filter device 4, the port part of the diameter expanding section 403 is wrapped with the geotextile 301, and the geotextile 301 is bound and fixed by the binding wire 302 after being wrapped.

Finally, backfilling the wall back soil 9 layer by layer, tamping each layer of wall back soil 9, backfilling the next layer, enabling the bottom surface of each layer of wall back soil 9 to be close to the inlet edge of the drainage pipe 2 of the layer, and installing the reverse filtering device 4 according to the steps; and repeating the backfilling and the installation of the reverse filtering device 4 for many times until the top surface of the soil behind the wall 9 is filled and tamped with the high retaining wall 1.

The high-soil-retaining-wall 1 drainage structure is simple and stable in structure, the investment of manpower and machines in the construction of the traditional high-soil-retaining-wall 1 drainage structure is greatly reduced, the use is convenient, the construction difficulty is reduced, the construction quality of the high-soil-retaining-wall 1 drainage structure is ensured, the construction efficiency of the soil-retaining-wall 1 drainage structure and the backfilling construction efficiency of soil filled behind the wall are improved, the construction efficiency is greatly improved, and the construction period is saved.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.