CN216809738U

CN216809738U - River course bottom seepage prevention structure

Info

Publication number: CN216809738U
Application number: CN202122694635.4U
Authority: CN
Inventors: 王锦辉; 李瑞琴; 石盼盼; 王波雷; 刘锁
Original assignee: PowerChina Northwest Engineering Corp Ltd
Current assignee: PowerChina Northwest Engineering Corp Ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-06-24
Anticipated expiration: 2031-11-05

Abstract

A river channel bottom anti-seepage structure is characterized in that a medium-coarse sand protective layer, a composite geomembrane layer, a medium-coarse sand protective layer, a geotextile layer and a check net layer are sequentially paved on the leveled river channel bottom from bottom to top; concrete retaining walls are arranged on two sides of the river channel; the composite geomembrane and the geotextile are positioned at the bottom of the concrete retaining wall. The anti-seepage structure at the bottom of the river channel is anti-seepage through the composite geomembrane layer and the geotechnical cloth layer, and is compressed and protected through the coarse sand layer and the check net layer. Meanwhile, the check net layer prevents the river bottom from being damaged by artificial sand digging, the seepage-proofing function of the river bottom seepage-proofing structure is improved, and the service life of the river bottom seepage-proofing structure is prolonged.

Description

River course bottom seepage prevention structure

Technical Field

The utility model relates to a bottom anti-seepage structure for riverways and lakes.

Background

At present, due to the fact that a large amount of sand is collected in a large number of riverways, serious damage is caused to the bottoms of the riverways, a large amount of water is deeply drained, the water is low and runs off, and the environment is greatly influenced. Aiming at river bottom seepage prevention, the currently generally adopted mode is to tamp the original soil of the river bottom to form a compact plain soil base, then lay a waterproof blanket, and lay a 50cm loam layer on the waterproof blanket, and the seepage prevention structure has poor seepage prevention effect and is easy to cause water seepage and loss.

Disclosure of Invention

The utility model aims to provide a river channel bottom seepage-proofing structure which is good in seepage-proofing effect and free of damage to the bottom of a river channel caused by illegal sand digging.

In order to solve the technical problems, the technical scheme provided by the utility model is a riverway bottom anti-seepage structure, wherein the anti-seepage structure is formed by sequentially paving a medium-coarse sand protective layer, a composite geomembrane layer, a medium-coarse sand protective layer, a geotextile layer and a check net layer at the bottom of a leveled riverway from bottom to top; concrete retaining walls are arranged on two sides of the river channel.

Preferably, sunken steps lower than the bottom of the river channel are arranged on two sides of the bottom of the river channel, the bottom of the concrete retaining wall is positioned outside the steps, and a protection leg positioned above the side of each step extends towards the center of the river channel; the middle coarse sand protective layer, the composite geomembrane layer, the middle coarse sand protective layer and the geotextile layer are all extended and laid at the step; the composite geomembrane and the geotextile are bent upwards along the side face of the foot protector of the concrete retaining wall and are positioned on the foot protector; the check net is propped against and tightly presses the geomembrane and the geotextile which are positioned on the side face of the foot guard of the concrete retaining wall; arranging a concrete beam for fastening and fixing by pressure on the geomembrane and the geotextile which are positioned on the foot guards; the upper surface of the foot protector is flush with the upper surface of the check net.

Preferably, the thickness of the medium coarse sand protective layer is 10-30 cm.

Preferably, the mesh of the check net is a honeycomb mesh, and the tensile strength of the mesh surfaceMore than 36KM/m, elongation more than 15%, and zinc content more than 245g/m²。

Preferably, the check net is filled with stones and 20% of broken stones or sand gravels; the outer diameter of the stone is 1-2 times larger than the meshes of the check net; the filling compactness is more than 80 percent.

Preferably, the stone filling height is 2-3cm higher than the check net box.

The river channel bottom anti-seepage structure disclosed by the utility model has the advantages that the anti-seepage is realized through the composite geomembrane layer and the geotechnical cloth layer, and the coarse sand layer and the check net layer are used for compressing and protecting the anti-seepage structure. Meanwhile, the check net layer prevents the river bottom from being damaged by artificial sand digging, the seepage-proofing function of the river bottom seepage-proofing structure is improved, and the service life of the river bottom seepage-proofing structure is prolonged. Simultaneously, the geomembrane and the geotextile are compacted through the bottom foot guards of the retaining wall to improve seepage prevention, and the retaining wall strength is improved by arranging masonry stones at the bottom of the retaining wall. The retaining wall prevents the river bank from being scoured and eroded by water flow.

Drawings

Fig. 1, a schematic view of a river channel structure.

Fig. 2 is a cross-sectional view of a river bottom anti-seepage structure.

Detailed Description

In view of the above technical solutions, preferred embodiments are described in detail with reference to the drawings. The utility model relates to a river bottom anti-seepage structure which mainly comprises a medium-coarse sand protective layer, a composite geomembrane layer, a medium-coarse sand protective layer, a geotechnical cloth layer and a check net layer which are sequentially paved from bottom to top; concrete retaining walls are arranged on two sides of the river channel. See fig. 1-2, wherein.

Leveling the bottom of the riverbed of the riverway, then digging downwards at two sides of the bottom of the riverway and leveling a sunken step lower than the bottom of the riverway, wherein the connecting surface of the step and the bottom of the riverway is an inclined surface. The bottoms of retaining walls 1 on two sides of the river channel are positioned on the outer sides of the steps, concrete guard feet 11 extend towards the center direction of the river channel, and the upper surfaces of the guard feet are horizontal planes. And paving an anti-seepage structure at the bottom and the step of the leveled river channel. The anti-seepage structure comprises a medium coarse sand protective layer 2 with the thickness of about 15cm from bottom to top, a composite geomembrane layer 3 is laid above the medium coarse sand protective layer, the composite geomembrane is a PE geomembrane, and the thickness of the PE layer is 0.5cmCompounding the PE film with 300g/m on both sides²The nonwoven fabric layer of (2). And a medium coarse sand protective layer 4 with the thickness of about 15cm is laid above the composite geotechnical film layer, a geotechnical cloth layer 5 is laid above the medium coarse sand protective layer at one time, and a check net layer 6 is laid above the geotechnical cloth layer 5. The length, width and height of the check net in the check net layer generally adopt three specifications of 2 x 1m, 2 x 1 x 0.5m and 2 x 1 x 0.3 m. The mesh size of the check nets is a 90 x 120mm honeycomb type mesh structure, the diameter of the net wire is 2.6mm, and the diameter of the net edge wire is 3.2 mm. The tensile strength of the net surface is about 36KN/m, the elongation is about 15 percent, and the zinc content is more than 245g/m². The check net adopts alloy steel wires, and the use of low-carbon steel wire coating materials is forbidden, namely the check net adopts a Golgi check net. The check net is filled with stones 1-2 times larger than the aperture of the net, 20% of broken stones or sand gravels are filled along with the stones when the stones are filled, the holes are simultaneously compacted when the stones are filled, the compactness is larger than 80%, and the stone filling surface is 2-3cm higher than the box body. The check net is filled at the bottom of the river channel and the step and is attached to the foot protection 11. When the step is positioned, the check net is propped against the side surface of the concrete retaining wall toe guard and is flush with the upper surface of the toe guard. The composite geomembrane and the geotextile are bent upwards from the space between the check net and the concrete retaining wall toe guards and then are laid on the upper surfaces of the toe guards, and then the upper surfaces of the toe guards are provided with the compression concrete beams 12. In order to strengthen the concrete retaining wall, a slope-type stone building layer can be arranged at the bottom of the concrete retaining wall.

Claims

1. The anti-seepage structure for the bottom of the river channel is characterized in that a medium-coarse sand protective layer, a composite geomembrane layer, a medium-coarse sand protective layer, a geotextile layer and a check net layer are sequentially paved on the leveled bottom of the river channel from bottom to top; concrete retaining walls are arranged on two sides of the river channel; the composite geomembrane and the geotextile are positioned at the bottom of the concrete retaining wall.

2. The river bottom seepage-proofing structure according to claim 1, wherein sunken steps lower than the bottom of the river are arranged on two sides of the bottom of the river, the bottom of the concrete retaining wall is positioned on the outer side of the steps, and a protection leg positioned above the side of the step extends towards the center of the river; the medium coarse sand protective layer, the composite geomembrane layer, the medium coarse sand protective layer and the geotextile layer are all extended and laid at the step; the composite geomembrane and the geotextile are bent upwards along the side surface of the foot guard of the concrete retaining wall and are positioned on the foot guard; the check net is propped against and tightly presses the geomembrane and the geotextile which are positioned on the side face of the foot guard of the concrete retaining wall; arranging a concrete beam for compression fixation on the geomembrane and the geotextile which are positioned on the foot protector; the upper surface of the foot protector is flush with the upper surface of the check net.

3. The river bottom seepage-proofing structure of claim 1, wherein the thickness of the medium-coarse sand protective layer is 10-30 cm.

4. The river bottom seepage prevention structure of claim 1, wherein the check net is a Golgin check net, the mesh of the check net is a honeycomb mesh, the tensile strength of the mesh surface is more than 36KN/m, and the elongation is more than 15%.

5. The river bottom seepage prevention structure as claimed in claim 1, wherein stones and 20% of crushed stones or sand gravel are filled in the check net; the outer diameter of the stone is 1-2 times larger than the meshes of the check net; the filling compactness is more than 80 percent.

6. The river bottom seepage prevention structure as claimed in claim 5, wherein the stone filling height is 2-3cm higher than the check net box.