Prefabricated anti-filter layer retaining wall and construction method thereof

Abstract

The application discloses a prefabricated anti-filter layer retaining wall and a construction method thereof. The retaining wall is provided with prefabricated and split anti-filter layers on the inner side walls of the wall body. The anti-filter layers comprise a plurality of vertically distributed anti-filter units. Each anti-filter unit corresponds to each group of drainage holes. The inside of the anti-filter unit is made of plastic material with a mesh water-permeable structure, and the outside is wrapped with anti-filter geotextile. The anti-filter unit comprises a plate-shaped main body and protrusions distributed on one side of the lower end of the plate-shaped main body. The plate-shaped main body is attached to the inner side walls of the wall body, and each protrusion is inserted into each drainage hole of the corresponding group. The backfill soil is arranged in layers, and the anti-seepage geotextile is arranged on the interface between the adjacent layers of backfill soil. Each layer of backfill soil interface corresponds to each group of drainage holes. The bottom surface of the lowermost plate-shaped main body is attached and supported on the lowermost layer of backfill soil through the anti-seepage geotextile. The bottom surfaces of the plate-shaped main bodies of the remaining layers are all attached and supported on the top surfaces of the next layers of plate-shaped main bodies through the anti-seepage geotextile. The application improves the construction speed and avoids water collection at the bottom of the wall.

Description

TECHNICAL FIELD

[0001] The present application relates to a retaining wall, in particular to a prefabricated anti-filtration retaining wall and a construction method thereof. BACKGROUND

[0002] The retaining wall can support the roadbed fill or the hillside soil, prevent the deformation and instability of the fill or the soil, has the functions of bank connection, water retaining, soil retaining, and seepage prevention, and is widely used in water conservancy and municipal engineering. The back of the retaining wall is usually backfilled with earth, and the lateral pressure is generally large, especially after the rain, the accumulated water in the earth is serious, if not discharged in time, a water pocket is formed behind the retaining wall or the wall joint leaks, which finally affects the stability of the retaining wall structure, therefore, a drainage pipe is generally arranged at intervals in the wall body of the retaining wall, and an anti-filtration layer is arranged behind the wall body.

[0003] The traditional anti-filtration layer construction of the retaining wall is to separate the anti-filtration layer and the earth by using geotextile, and the anti-filtration layer is filled while the earth is backfilled, therefore, the construction speed is slow, and the seepage water in the anti-filtration layer is prone to vertical flow, a large amount of water is concentrated to the bottom of the retaining wall, the upper drainage pipe loses the function of drainage, the seepage water is collected to the bottom, the water flow is large, and fine sand is easily carried away, which affects the stability of the retaining wall structure. SUMMARY

[0004] The purpose of the present application is to provide a prefabricated anti-filtration retaining wall and a construction method thereof, which do not need to backfill the anti-filtration layer and tamp, do not need to alternate construction with the earth backfilling, greatly improve the construction speed, can change the unorganized flow of water in the soil into an organized layered drainage mode, and avoid the continuous downward flow of water to be collected at the bottom of the wall.

[0005] The technical scheme adopted by the present application is as follows:

[0006] A prefabricated anti-filtration retaining wall comprises a wall body in which a plurality of groups of drainage holes are arranged in layers; a prefabricated and split anti-filtration layer is installed on the inner side wall of the wall body, the anti-filtration layer comprises a plurality of vertically distributed anti-filtration units, each anti-filtration unit corresponds to each group of drainage holes, the inside of the anti-filtration unit is made of a plastic material with a mesh water permeable structure, and the outside is wrapped with anti-filtration geotextile, the anti-filtration unit comprises a plate-shaped main body and protrusions distributed at the lower end of one side of the plate-shaped main body, the plate-shaped main body is attached to the inner side wall of the wall body, and the protrusions are inserted into each drainage hole of the corresponding group; the backfilled earth on the inner side of the wall body is arranged in layers, and anti-filtration geotextile is laid on the interface between adjacent layers of backfilled earth, each layer of backfilled earth interface corresponds to each group of drainage holes, the bottom surface of the lowermost plate-shaped main body is attached and supported on the lowermost layer of backfilled earth through the anti-filtration geotextile, and the bottom surface of the plate-shaped main body of the remaining layers is attached and supported on the top surface of the next layer of plate-shaped main body through the anti-filtration geotextile.

[0007] Preferably, the drainage hole is obliquely arranged, and the low end of the drainage hole is located at the outer side of the wall body; the top surface and the bottom surface of the filter unit have the same obliquity as the drainage hole; and the height of the filter unit is the same as the interval of the drainage holes of the adjacent layer.

[0008] Preferably, the interface of the backfill soil has the same obliquity as the drainage hole and is connected to the bottom surface of the corresponding filter unit.

[0009] Preferably, the obliquity of the drainage hole is 2%.

[0010] Preferably, when the length of the wall body is short, a single filter unit is used in each layer; and when the length of the wall body is long, two or more filter units are used in parallel in each layer.

[0011] Preferably, the drainage hole and the protrusion are in the shape of a cuboid.

[0012] Preferably, the plastic material in the filter unit is polyethylene.

[0013] The construction method of the prefabricated filter layer retaining wall comprises the following steps: S1, constructing the wall body of the retaining wall and reserving the drainage holes on the wall body; S2, after the wall body reaches the strength capable of backfilling the earthwork, backfilling and compacting the lowermost layer of backfill soil until the lowermost layer of backfill soil reaches the low elevation of the lowermost layer of drainage holes, laying the impermeable geotextile on the lowermost layer of backfill soil, and installing the lowermost layer of filter unit so that the plate-shaped main body is attached to the inner side wall of the wall body, each protrusion is inserted into each drainage hole of the lowermost layer, and the bottom surface of the plate-shaped main body is attached to the lowermost layer of backfill soil through the impermeable geotextile;

[0014] S3:

[0015] Scheme I: using the cycle construction method of backfilling and compacting the current layer of backfill soil, laying the impermeable geotextile of the upper layer, and installing the filter unit of the upper layer, layer by layer, until the uppermost layer of filter unit is installed, and then backfilling the uppermost layer of backfill soil;

[0016] Scheme II: sequentially installing the remaining filter units upward, and setting the impermeable geotextile between the adjacent filter units, until the uppermost layer of filter unit is installed, and then backfilling the remaining backfill soil layer by layer upward, and separating the backfill soil of adjacent layers by using the reserved impermeable geotextile and the newly added impermeable geotextile;

[0017] Scheme III: sequentially installing the remaining filter units upward, and setting the impermeable geotextile between the adjacent filter units, and at the same time, backfilling the remaining backfill soil layer by layer upward, and separating the backfill soil of adjacent layers by using the reserved impermeable geotextile and the newly added impermeable geotextile.

[0018] The beneficial effects of the present application are as follows:

[0019] The filter layer is prefabricated and split. There is no need to backfill the filter layer and tamp it, and there is no need to alternate construction with earth backfill. It can be installed directly layer by layer, and can be installed separately, which greatly improves the construction speed. The filter layer can use the mesh permeable structure to penetrate water. At the same time, the filter geotextile can prevent soil loss during drainage, which not only maintains the stability of the soil, but also avoids affecting the permeability of the filter unit. The anti-seepage geotextile can block the water that penetrates into the filter layer from flowing downward and the flow between water layers in the backfill soil. Therefore, the unorganized flow of water in the soil can be transformed into an organized layered drainage method. The water in each layer enters the filter unit of each layer and is discharged through the drainage holes of each layer, which not only improves the drainage rate, but also, the key is that it can prevent water from continuing to flow downward and gather at the bottom of the wall to prevent local settlement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of a prefabricated filter retaining wall in an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the interior of the filtration unit in an embodiment of the present invention (excluding the external filtration geotextile), the dimensions in the figure are in cm.

[0022] In the figure: 1-wall; 2-filter unit; 201-plate body; 202-protrusion; 3-backfill soil; 4-anti-seepage geotextile. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and examples.

[0024] Example 1

[0025] This embodiment discloses a prefabricated filter retaining wall, such as Figure 1 As shown, it includes a wall 1, a filter layer and backfill soil 3; wherein: the wall 1 is layered with a plurality of drainage holes, as shown in FIG. Figure 1 The filter layer is installed on the inner wall of the wall 1, and adopts a prefabricated and split structure, including several vertically distributed filter units 2, each filter unit 2 corresponds to each group of drainage holes, the interior of the filter unit 2 is made of plastic material with a mesh permeable structure, and the outside is wrapped with a filter geotextile. The filter unit 2 includes a plate-shaped body 201 and a protrusion 202 distributed at the lower end of one side of the plate-shaped body 201. The plate-shaped body 201 is attached to the inner wall of the wall 1, and each protrusion 202 is inserted into each drainage hole of the corresponding group. Figure 1 and Figure 2The backfill soil 3 is arranged in layers on the inner side of the wall 1, and an anti-seepage geotextile 4 is laid on the interface of the adjacent layers of backfill soil 3. The interface of each layer of backfill soil 3 corresponds to each group of drainage holes. The bottom surface of the bottom plate-like body 201 is supported on the bottom layer of backfill soil 3 through the anti-seepage geotextile 4, and the bottom surfaces of the plate-like bodies 201 of the remaining layers are supported on the top surface of the next layer of plate-like bodies 201 through the anti-seepage geotextile 4. Figure 1 .

[0026] From the above scheme, we can see that:

[0027] First, the filter layer is prefabricated and split, so there is no need to backfill the filter layer and compact it, and there is no need to alternate construction with earth backfill. It can be installed directly layer by layer and can be installed separately, which greatly improves the construction speed.

[0028] Second, the filter layer can use the mesh permeable structure to pass through water. At the same time, the filter geotextile can prevent soil loss during drainage, which not only maintains the stability of the soil, but also avoids affecting the permeability of the filter unit 2. The anti-seepage geotextile 4 can block the water that penetrates into the filter layer from flowing downward and the water flow between layers in the backfill soil 3. Therefore, the unorganized flow of water in the soil can be transformed into an organized layered drainage method. The water in each layer enters the filter unit 2 of each layer and is discharged through the drainage holes of each layer, which not only improves the drainage rate, but also, the key is that it can prevent water from continuing to flow downward and gathering at the bottom of the wall, preventing local settlement.

[0029] like Figure 1 and Figure 2 As shown, in this embodiment, preferably: the drainage hole is arranged at an angle and the end thereof on the outside of the wall 1 is the lower end, the top and bottom surfaces of the filter unit 2 have the same inclination as the drainage hole, and the height of the filter unit 2 is the same as the spacing between the drainage holes of the adjacent layers; the interface of the backfill soil 3 has the same inclination as the drainage hole and is connected to the bottom surface of the corresponding filter unit 2 to improve drainage efficiency; the inclination of the drainage hole is 2%.

[0030] like Figure 2 As shown, in this embodiment, preferably: the drainage hole and the protrusion 202 are rectangular, and the wall 1 and the filter unit 2 are easy to manufacture.

[0031] In this embodiment, preferably, when the wall 1 is short, a single filter unit 2 is used in each layer; when the wall 1 is long, two or more filter units 2 are used in parallel in each layer.

[0032] In this embodiment, preferably, the plastic material inside the reverse filtration unit 2 is polyethylene, which is corrosion-resistant, pressure-resistant, and wear-resistant.

[0033] Considering the setting of the retaining wall settlement joint and the convenience of transportation, taking the wall body 110 meters long as an example, the size of the drainage hole is 11 cm x 11 cm, two anti-filtration units 2 are arranged on each layer, the anti-filtration unit 2 is 20 cm wide, 200 cm high, and 500 cm long, the top surface and the bottom surface have a slope of 2%, and there are three protrusions 202, the protrusion 202 is 10 cm wide, 10 cm high, and greater than or equal to 25 cm long, the protrusions 202 are spaced 200 cm apart, and the protrusions 202 extend into the drainage hole by at least 25 cm, so as not to fall from the inner side wall of the wall body 1 even without the support of the plate-shaped body 201.

[0034] Example two

[0035] The embodiment discloses a first construction method of the prefabricated anti-filtration layer retaining wall in example one, comprising the steps of:

[0036] S1, constructing the wall body 1 of the retaining wall, and reserving the drainage hole on the wall body 1;

[0037] S2, after the wall body 1 reaches the strength capable of backfilling the earthwork, the lowermost backfilling soil 3 is backfilled and compacted, until the lowermost backfilling soil 3 reaches the low elevation of the lowermost drainage hole, then the impermeable geotextile 4 is laid on the lowermost backfilling soil 3, and the lowermost anti-filtration unit 2 is installed, so that the plate-shaped body 201 is attached to the inner side wall of the wall body 1, each protrusion 202 is inserted into each drainage hole of the lowermost layer, and the bottom surface of the plate-shaped body 201 is attached and supported on the lowermost backfilling soil 3 through the impermeable geotextile 4;

[0038] S3, the cycle construction method of backfilling the current layer of backfilling soil 3 and compacting, laying the impermeable geotextile 4 of the previous layer, and installing the anti-filtration unit 2 of the previous layer is adopted, and the construction is carried out layer by layer upwards, until the uppermost anti-filtration unit 2 is installed, and then the uppermost backfilling soil 3 is backfilled.

[0039] Example three

[0040] The embodiment discloses a second construction method of the prefabricated anti-filtration layer retaining wall in example one, comprising the steps of:

[0041] S1, constructing the wall body 1 of the retaining wall, and reserving the drainage hole on the wall body 1;

[0042] S2, after the wall body 1 reaches the strength capable of backfilling the earthwork, the lowermost backfilling soil 3 is backfilled and compacted, until the lowermost backfilling soil 3 reaches the low elevation of the lowermost drainage hole, then the impermeable geotextile 4 is laid on the lowermost backfilling soil 3, and the lowermost anti-filtration unit 2 is installed, so that the plate-shaped body 201 is attached to the inner side wall of the wall body 1, each protrusion 202 is inserted into each drainage hole of the lowermost layer, and the bottom surface of the plate-shaped body 201 is attached and supported on the lowermost backfilling soil 3 through the impermeable geotextile 4;

[0043] S3, install the remaining filter units 2 in turn upwards, and set the impermeable geotextile 4 between adjacent filter units 2, until the uppermost filter unit 2 is installed, then backfill the remaining backfill soil 3 layer by layer upwards, and separate the backfill soil 3 of adjacent layers by using the reserved impermeable geotextile 4 and the newly added impermeable geotextile 4.

[0044] Example Four

[0045] The embodiment discloses a third construction method of the prefabricated filter layer retaining wall in example one, comprising the steps of:

[0046] S1, construct the wall body 1 of the retaining wall, and reserve drainage holes on the wall body 1;

[0047] S2, after the wall body 1 reaches the strength that can be backfilled with soil, start backfilling the lowermost backfill soil 3 and compacting, until the lowermost backfill soil 3 reaches the low elevation of the lowermost drainage hole, then lay the impermeable geotextile 4 on the lowermost backfill soil 3, and install the lowermost filter unit 2, so that the plate-shaped main body 201 is attached to the inner side wall of the wall body 1, each protrusion 202 is inserted into the lowermost drainage hole, and the bottom surface of the plate-shaped main body 201 is attached to the lowermost backfill soil 3 through the impermeable geotextile 4;

[0048] S3, install the remaining filter units 2 in turn upwards, and set the impermeable geotextile 4 between adjacent filter units 2, while backfilling the remaining backfill soil 3 layer by layer upwards, and separating the backfill soil 3 of adjacent layers by using the reserved impermeable geotextile 4 and the newly added impermeable geotextile 4.

[0049] The above-described embodiments are part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

Claims

1. A precast reverse filter retaining wall, comprising a wall body with a plurality of groups of drainage holes arranged in layers; characterized in that: The wall body is provided with prefabricated and split anti-filtration layers on the inner side wall, the anti-filtration layers comprise a plurality of vertically distributed anti-filtration units, each anti-filtration unit corresponds to each group of drainage holes, the inside of the anti-filtration unit is made of plastic material with a mesh water-permeable structure, and the outside is wrapped with anti-filtration geotextile, the anti-filtration unit comprises a plate-shaped main body and protrusions distributed at the lower end of one side of the plate-shaped main body, the plate-shaped main body is attached to the inner side wall of the wall body, and the protrusions are inserted into each drainage hole of the corresponding group; the backfill soil on the inner side of the wall body is arranged in layers, and anti-filtration geotextile is arranged on the interface between adjacent layers of backfill soil, each layer of backfill soil interface corresponds to each group of drainage holes, the bottom surface of the lowermost plate-shaped main body is attached and supported on the lowermost layer of backfill soil through the anti-filtration geotextile, and the bottom surface of the plate-shaped main body of the remaining layers is attached and supported on the top surface of the next layer of plate-shaped main body through the anti-filtration geotextile.

2. The precast reverse filter retaining wall of claim 1, wherein: The drainage holes are inclined, and one end of the drainage holes on the outer side of the wall body is the low end; the top surface and the bottom surface of the anti-filtration unit have the same inclination as the drainage holes; and the height of the anti-filtration unit is the same as the spacing of the adjacent layers of drainage holes.

3. The precast reverse filter retaining wall of claim 2, wherein: The interface between the backfill soil and the drainage holes has the same inclination as the anti-filtration unit and is connected to the bottom surface of the corresponding anti-filtration unit.

4. A precast reverse filter retaining wall according to claim 2 or 3 wherein: The inclination of the drainage holes is 2%.

5. The precast revetment wall of claim 1, wherein: When the length of the wall body is short, a single anti-filtration unit is used for each layer; when the length of the wall body is long, two or more anti-filtration units are used side by side for each layer.

6. The precast revetment wall of claim 1, wherein: The drainage holes and the protrusions are in the shape of a cuboid.

7. The precast reverse filter retaining wall of claim 1, wherein: The plastic material inside the anti-filtration unit is polyethylene.

8. A method of constructing a precast reverse filter retaining wall as claimed in any one of claims 1 to 7, characterised in that, The steps include: S1, constructing a wall body of a retaining wall and reserving drainage holes on the wall body; S2, after the wall body reaches the strength for backfilling, backfilling the lowermost layer of backfill soil and compacting it until the lowermost layer of backfill soil reaches the low elevation of the lowermost layer of drainage holes, laying anti-filtration geotextile on the lowermost layer of backfill soil, and installing the lowermost anti-filtration unit so that the plate-shaped main body is attached to the inner side wall of the wall body, the protrusions are inserted into each drainage hole of the lowermost layer, and the bottom surface of the plate-shaped main body is attached and supported on the lowermost layer of backfill soil through the anti-filtration geotextile; S3, using a cycle construction method of backfilling the current layer of backfill soil and compacting it, laying anti-filtration geotextile of the previous layer, and installing the anti-filtration unit of the previous layer, constructing layer by layer upwards until the uppermost anti-filtration unit is installed, and backfilling the uppermost layer of backfill soil.

9. A method of constructing a precast reverse filter retaining wall as claimed in any one of claims 1 to 7, characterised in that, The steps include: S1, constructing a wall body of a retaining wall and reserving drainage holes on the wall body; S2, after the wall body reaches the strength for backfilling, backfilling the lowermost layer of backfill soil and compacting it until the lowermost layer of backfill soil reaches the low elevation of the lowermost layer of drainage holes, laying anti-filtration geotextile on the lowermost layer of backfill soil, and installing the lowermost anti-filtration unit so that the plate-shaped main body is attached to the inner side wall of the wall body, the protrusions are inserted into each drainage hole of the lowermost layer, and the bottom surface of the plate-shaped main body is attached and supported on the lowermost layer of backfill soil through the anti-filtration geotextile; S3, sequentially installing the remaining anti-filtration units and arranging anti-filtration geotextile between adjacent anti-filtration units until the uppermost anti-filtration unit is installed, and backfilling the remaining backfill soil layer by layer upwards, and separating adjacent layers of backfill soil by using the reserved anti-filtration geotextile and newly added anti-filtration geotextile.

10. A method of constructing a precast reverse filter retaining wall as claimed in any one of claims 1 to 7, characterised in that, The steps include: S1, constructing a wall body of a retaining wall and reserving drainage holes on the wall body; S2, after the wall body reaches the strength that can be backfilled, the lowermost backfill soil is compacted until the lowermost backfill soil reaches the low elevation of the lowermost drainage hole, then the impermeable geotextile is laid on the lowermost backfill soil, and the lowermost filter unit is installed, so that the plate-shaped main body is attached to the inner wall of the wall body, each protrusion is inserted into each drainage hole of the lowermost layer, and the bottom surface of the plate-shaped main body is attached to the lowermost backfill soil through the impermeable geotextile; S3, the remaining filter units are installed in turn upwards, and the impermeable geotextile is arranged between adjacent filter units, and at the same time, the remaining backfill soil is backfilled layer by layer upwards, and the adjacent layer backfill soil is separated by using the reserved impermeable geotextile and the newly added impermeable geotextile.

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