Construction method of water-permeable slag-retaining dam

Abstract

The invention relates to a construction method of a water-permeable slag-retaining dam, which comprises the following steps: according to the conditions of ditch bed rock ballast, mining in situ, crushing rock ballast larger than 80cm, and roughly separating by taking 20cm as a boundary; the method comprises the following steps: filling and rolling a dam body in a layered manner by using stones of which the thickness is less than 20cm, tamping by adopting a small-sized vibrating tamping plate, and paving a layer of geogrid on the dam surface after each layer of tamping is completed and before the next layer of stones is paved; determining the position where a drainage pipe is arranged, and burying the drainage pipe in the rolling dam body; after the dam top of the rolling dam body is filled in a layered mode, a concrete net is hung on the upstream face of the rolling dam body to spray C20 concrete, a net-hung concrete spraying layer is formed, and a non-fine concrete layer is laid on the downstream face of the rolling dam body; metal net cages are laid from the dam top to the dam foot of the rolling dam body, the metal net cages are bundled by plastic-coated galvanized steel wire plates, and the metal net cages are laid from bottom to top; and the metal net box is filled with rock blocks to form a rock block gabion, and a rock filling anti-scour blocking layer is laid on the upstream face of the net hanging and concrete spraying layer.

Description

Technical Field

[0001] The present application relates to the technical field of debris flow ditch management, and in particular to a construction method of a permeable slag retaining dam. Background Art

[0002] Debris flow control is a complex project, especially when accessibility is poor. Construction often results in increased surface damage and disturbance of the ditch bottom. Debris dams are a common control structure, but currently, most are constructed with mortar masonry or concrete. These structures require high foundation conditions and materials, making them prone to the aforementioned disturbance and damage during construction. Summary of the Invention

[0003] The present application provides a construction method for a permeable slag retaining dam, which requires simple materials during construction, is easy to obtain locally, and can effectively avoid disturbance or damage caused during the construction process.

[0004] The construction method of the permeable slag retaining dam provided in this application comprises the following steps: 1) According to the conditions of the ditch bed slag, it is mined on site, and the slag larger than 80 cm is crushed and coarsely classified with 20 cm as the boundary; 2) Use stones less than 20 cm thick to fill and compact the dam body in layers, with each layer thickness controlled to less than 30 cm. Use a small vibrating tamping plate to tamp the dam. After each layer is tamped and before the next layer of stones is laid, lay a layer of geogrid on the dam surface; 3) Determine the location of the drainage pipe and bury the drainage pipe in the rolling dam body; 4) After filling the dam in layers up to the crest of the roller compacted dam body, a concrete mesh is hung on the upstream side of the roller compacted dam body and C20 concrete is sprayed to form a mesh-hanging sprayed concrete layer, and a sandless concrete layer is laid on the downstream side of the roller compacted dam body; 5) Laying metal mesh boxes from the crest to the foot of the rolled dam body. The metal mesh boxes are made of plastic-coated galvanized steel wire sheets and are laid from bottom to top with staggered seams on the plane. The gaps between the slope of the rolled dam body and the sides of the metal mesh boxes are filled with stones of the same particle size as the metal mesh boxes. 6) Filling the metal mesh box with rocks to form a rock cage, and laying a rockfill anti-scouring layer on the upstream side of the mesh sprayed concrete layer.

[0005] In addition, the construction method of the permeable slag retaining dam provided in this application may also have the following additional technical features: In an alternative, the sprayed concrete layer is arranged on the upstream side and the top of the roller compacted dam body, and the sprayed concrete layer on the upstream side is arranged between the roller compacted dam body and the rockfill anti-scour layer, and the drainage pipe penetrates through the sprayed concrete layer and the sandless concrete layer.

[0006] In an alternative, after the construction is completed, the vertical thickness of the rockfill anti-scour layer is not less than 80 cm, the rockfill anti-scour layer is piled up by stones and / or boulders with a particle size of 20-80 cm, and the boulders are piled up around the pipe opening of the drainage pipe to shield the pipe opening to avoid small stones entering the drainage pipe. The thickness of the sprayed concrete layer is 10-15 cm, and the thickness of the sandless concrete layer is 20-30 cm.

[0007] In an alternative, the metal mesh box in the block stone gabion is made of zinc-aluminum alloy steel wire with corrosion resistance and / or plastic-coated galvanized steel wire, and the particle size of the block stone in the block stone gabion is not less than 20 cm.

[0008] In an alternative, the drainage pipe is a steel belt reinforced PE spiral corrugated pipe with a wall thickness of not less than 1 cm, the pipe diameter of the drainage pipe is 20-30 cm, and the drainage slope of the drainage pipe from the upstream side to the downstream side is not less than 5%.

[0009] In an alternative, after the construction is completed, the height of the roller compacted dam body is not more than 5 m, the width of the top is 2-3 m, the slope ratio of the upstream side slope surface of the roller compacted dam body is 1:1.5 or more gentle, the slope ratio of the downstream side slope surface is 1:2.0 or more gentle, and the downstream side slope surface is provided with a road with a width of 1-2 m.

[0010] The application has the following beneficial effects: The water permeable slag retaining dam constructed by the construction method includes the earthwork geogrid arranged in layers along the height direction, and the upstream side and the downstream side of the roller compacted dam body are respectively provided with the rockfill anti-scour layer and the anti-scour layer, and the overall structure has good structural stability, water permeability and anti-scour property. The construction method is based on local materials and small equipment, avoids secondary damage to the treatment area caused by large equipment and material transportation, and effectively avoids disturbance or damage during construction.

[0011] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The transverse cross-sectional view of the water permeable slag retaining dam provided by the application in a specific embodiment; Figure 2 TheFigure 1 Fig. 1 is a longitudinal section view of a water-permeable slag dam in a specific embodiment.

[0013] Fig. 1 is a longitudinal section view of a water-permeable slag dam in a specific embodiment.

[0014] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application. DETAILED DESCRIPTION

[0015] For better understanding of the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the drawings.

[0016] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other technical solutions obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0017] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0018] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0019] It should be noted that the "up", "down", "left", "right" and other directional words described in the embodiments of the present application are described from the angle shown in the drawings, and should not be understood as a limitation on the embodiments of the present application. In addition, in the context, it should also be understood that when referring to an element connected to another element "on" or "under", it can be directly connected to another element "on" or "under", or indirectly connected to another element "on" or "under" through an intermediate element.

[0020] As Figures 1-2 As shown in the drawings, the construction method of the water-permeable slag dam provided by the embodiments of the present application can be used as a check dam for mud and stone flow ditch treatment to reduce the risk of mud and stone flow start, and also can be used as a slag blocking facility at the bottom of the reservoir tail ditch to reduce the solid runoff into the reservoir. It mainly includes the following steps: 1) According to the conditions of the ditch bed stone slag, in-situ mining, greater than 80 cm is crushed, and coarse division is performed with 20 cm as the boundary; 2) Utilize the stone below 20 cm to layer filling and rolling dam body 1, the thickness of each layer is controlled below 30 cm, small vibration tamper plate is used for ramming, after each layer ramming is completed and before laying the next layer of stone, a layer of geogrid 2 is laid on the dam surface; 3) Determine the position of the drainage pipe 3, and bury the drainage pipe 3 in the rolling dam body 1; 4) After layer filling to the top of the rolling dam body 1, spray C20 concrete on the upstream surface of the rolling dam body 1 to form a sprayed concrete layer 6, and lay a sand-free concrete layer 5 on the downstream surface of the rolling dam body 1; 5) Lay a metal mesh box on the top of the rolling dam body 1 to the dam foot, the metal mesh box is made of plastic-coated galvanized steel wire plate, and the metal mesh box is laid from bottom to top and staggered on the plane, the gap between the slope surface of the rolling dam body 1 and the side surface of the metal mesh box is filled with stones of the same size as the metal mesh box; 6) Fill the stones into the metal mesh box to form a stone cage 7, and lay a rock protection layer 4 on the upstream surface of the sprayed concrete layer 6.

[0021] In the water permeable slag retaining dam constructed by the construction method in the embodiment, the rolling dam body 1 includes geogrids 2 arranged in layers along the height direction thereof, and the upstream side and the downstream side of the rolling dam body 1 are respectively provided with a rock protection layer 4 and a scouring resistant layer, the overall structure has good structural stability, water permeability and scouring resistance, the entire construction method is based on local materials, small equipment construction, avoids secondary damage to the treatment area caused by large equipment and material transportation, and effectively avoids disturbance or damage caused during construction.

[0022] As shown in Figures 1-2 In a specific embodiment, the water permeable slag retaining dam constructed by the construction method mainly includes a rolling dam body 1, a rock protection layer 4 and a scouring resistant layer. The rolling dam body 1 is transversely arranged in the ditch body, the rolling dam body 1 includes multiple layers of geogrids 2 and multiple drainage pipes 3, the multiple layers of geogrids 2 are arranged in layers along the height direction of the rolling dam body 1, the layered geogrids 2 are simple to obtain materials, and can effectively improve the integrity of the rolling dam body 1.

[0023] A plurality of drain pipes 3 are arranged in the roller compacted dam body 1 at intervals, and the drain pipes 3 communicate the upstream side and the downstream side of the roller compacted dam body 1; the rockfill anti-scour layer 4 is arranged on the upstream side of the roller compacted dam body 1, and has a preset stacking thickness; the anti-scour layer comprises a sandless concrete layer 5, which is arranged on the downstream side of the roller compacted dam body 1 and has a preset stacking thickness; the sandless concrete has good water permeability and strength, and will not cause blockage of water seepage of the roller compacted dam body 1, and has good anti-scour effect on water overflowing the top of the roller compacted dam body 1, thereby effectively protecting the downstream face of the roller compacted dam body 1.

[0024] In the water-permeable slag dam in the embodiment, the roller compacted dam body 1 comprises geogrids 2 arranged in layers along the height direction thereof, and the upstream side and the downstream side of the roller compacted dam body 1 are respectively provided with the rockfill anti-scour layer 4 and the anti-scour layer, and the overall structure has good structural stability, water permeability and anti-scour property, facilitates on-site material procurement, and can effectively avoid disturbance or damage caused in the construction process.

[0025] As shown in Figures 1-2 In a specific embodiment, the meshed sprayed concrete layer 6 is arranged on the upstream side and the top of the roller compacted dam body 1, and the meshed sprayed concrete layer 6 on the upstream side is located between the roller compacted dam body 1 and the rockfill anti-scour layer 4, and the drain pipes 3 pass through the meshed sprayed concrete layer 6 and the sandless concrete layer 5.

[0026] As shown in Figures 1-2 In a specific embodiment, after the construction is completed, the vertical thickness of the rockfill anti-scour layer 4 is not less than 80 cm, the rockfill anti-scour layer 4 is built by stone blocks and / or boulders with a particle size of 20-80 cm, and the boulders are built around the pipe openings of the drain pipes 3 to shield the openings, so as to avoid small stone blocks entering the drain pipes 3; the thickness of the meshed sprayed concrete layer 6 is 10-15 cm, and the thickness of the sandless concrete layer 5 is 20-30 cm.

[0027] Specifically, when the rockfill anti-scour layer 4 in the embodiment is filled, 40 cm or so of boulders are built around the pipe openings of the upstream exposed drain pipes 3 to shield the pipe openings, so as to avoid small stone blocks entering the holes. The rockfill anti-scour layer 4 has good water permeability, can protect the water permeable facilities of the roller compacted dam body 1 from impact damage in heavy floods, and has a certain protective effect on the blockage of the drain pipes 3.

[0028] As shown in Figures 1-2 In a specific embodiment, after the construction is completed according to the construction method in the above embodiment, the block stone gabion 7 is arranged on the top of the roller compacted dam body 1 and the downstream side of the sandless concrete layer 5, the metal mesh box in the block stone gabion 7 uses zinc-aluminum alloy steel wire with corrosion resistance and / or plastic-coated galvanized steel wire, and the particle size of the block stones in the block stone gabion 7 is not less than 20 cm.

[0029] As Figures 1-2 shown, in a specific embodiment, the drain pipe 3 is a steel tape reinforced PE spiral corrugated pipe with a wall thickness not less than 1 cm, the pipe diameter of the drain pipe 3 is 20-30 cm, and the drainage slope of the drain pipe 3 from the upstream side to the downstream side is not less than 5%. Specifically, the plurality of drain pipes 3 can be arranged in a quincunx type in the roller compacted dam body 1, and the drain pipes 3 arranged at intervals and with a drainage slope not less than 5% can be beneficial to the drainage from the upstream side to the downstream side. The number and interval distance of the drain pipes 3 can be preset according to the local environmental drainage demand, which is not specifically limited herein.

[0030] In addition, after the construction method in the above embodiments is completed, the height of the roller compacted dam body 1 is generally not more than 5 m, the top width is 2-3 m, the slope ratio of the upstream side slope surface of the roller compacted dam body 1 is about 1:1.5 or more gentle, the slope ratio of the downstream side slope surface is about 1:2.0 or more gentle, and the downstream side slope surface is provided with a horse path with a width of 1-2 m. The number of the horse path can be preset according to the actual demand, which is not specifically limited herein.

[0031] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A construction method for a permeable slag retaining dam, characterized in that: The following steps are involved: 1) According to the conditions of the ditch bed slag, it is mined on site, and the slag larger than 80 cm is crushed and coarsely classified with 20 cm as the boundary; 2) Use stones less than 20 cm thick to fill and compact the dam body in layers, with each layer thickness controlled to less than 30 cm. Use a small vibrating tamping plate to tamp the dam. After each layer is tamped and before the next layer of stones is laid, lay a layer of geogrid on the dam surface; 3) Determine the location of the drainage pipe and bury the drainage pipe in the rolling dam body; 4) After filling the dam in layers up to the crest of the roller compacted dam body, a concrete mesh is hung on the upstream side of the roller compacted dam body and C20 concrete is sprayed to form a mesh-hanging sprayed concrete layer, and a sandless concrete layer is laid on the downstream side of the roller compacted dam body; 5) Laying metal mesh boxes from the crest to the foot of the rolled dam body. The metal mesh boxes are made of plastic-coated galvanized steel wire sheets and are laid from bottom to top with staggered seams on the plane. The gaps between the slope of the rolled dam body and the sides of the metal mesh boxes are filled with stones of the same particle size as the metal mesh boxes. 6) Filling the metal mesh box with rocks to form a rock cage, and laying a rockfill anti-scouring layer on the upstream side of the mesh sprayed concrete layer.

2. The construction method of the permeable slag retaining dam according to claim 1, characterized in that: The mesh sprayed concrete layer is arranged on the upstream side and top of the roller compacted dam body, and the mesh sprayed concrete layer on the upstream side is located between the roller compacted dam body and the rockfill anti-scouring layer, and the drainage pipe passes through the mesh sprayed concrete layer and the sandless concrete layer.

3. The construction method of the permeable slag retaining dam according to claim 2, characterized in that: After the construction is completed, the vertical thickness of the rockfill anti-blocking layer is not less than 80 cm. The rockfill anti-blocking layer is made of stones and / or boulders with a particle size of 20 to 80 cm. Boulders are piled near the opening of the drainage pipe to block the opening to prevent small stones from entering the drainage pipe. The thickness of the mesh sprayed concrete layer is 10-15 cm, and the thickness of the sandless concrete layer is 20-30 cm.

4. The construction method according to any one of claims 1 to 3, characterized in that: The metal mesh box in the block stone cage is made of corrosion-resistant zinc-aluminum alloy steel wire and / or plastic-coated galvanized steel wire, and the particle size of the blocks in the block stone cage is not less than 20 cm.

5. The construction method of the permeable slag retaining dam according to claim 4, characterized in that: The drainage pipe is a steel-reinforced PE spiral corrugated pipe with a wall thickness of not less than 1 cm. The diameter of the drainage pipe is 20~30 cm, and the drainage slope of the drainage pipe from the upstream side to the downstream side is not less than 5%.

6. The construction method according to any one of claims 1 to 3 or 5, characterized in that: After the construction is completed, the height of the rolled dam body is no more than 5m, the top width is 2~3m, the slope ratio of the upstream side of the rolled dam body is 1:1.5 or gentler, the slope ratio of the downstream side slope is 1:2.0 or gentler, and the downstream side slope is provided with a horseway with a width of 1~2m.

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