CN211948314U - Seepage-proofing flexible step spillway - Google Patents

Abstract

The utility model discloses an anti-seepage flexible stepped spillway, which relates to the technical field of water conservancy. The original vertical side slope built with geotechnical bags is adjusted and designed into a combined structure of a spillway inclined side slope and a spillway side slope ladder, which can Better guiding of flowing water and more efficient spillage; the backfill soil in the CDASS geotechnical bag, the formed backfill soil of the spillway slope and the spillway slope step are all cemented soil mixed with lime, cement and soil, which can better To ensure the scour resistance and erosion resistance of the soil spillway and the stability of the slope and the chute; the entire exposed part of the spillway is treated with anti-seepage, which effectively prevents the erosion, infiltration and scour damage of the dam body by the water flow. The integrity and reliability of the dam body and the spillway are ensured; the original smooth U-shaped nails are replaced with T-shaped nails with a threaded structure, which increases the anchoring effect. The anti-seepage flexible stepped spillway has high construction efficiency and uses less materials .

Description

An anti-seepage flexible step spillway

technical field

The utility model relates to the technical field of water conservancy, in particular to an anti-seepage flexible stepped spillway.

Background technique

The traditional check dam spillway is built with non-impermeable geotextile bags, and the spillway slope is lined with geotextile bags. In the actual construction process, the original geotextile bags are bulky, resulting in their own weight. Multiplying, the lower geotechnical bag bears a huge weight. When the spillway leaks, water seeps into it, causing the overall structure of the spillway to deform and damage the structure, and the soil filled in the geotechnical bag is undisturbed soil. Sandy soil has zero internal cohesion and cannot meet the strength requirements of the spillway through compaction. The anchoring nails of the traditional spillway are smooth U-shaped nails, and the anchoring effect is relatively poor. At the same time, the traditional spillway is a non-seepage type spillway. When the spillway is discharged, as the water level rises, the erosion effect and permeability of the water flow continue to increase, which will damage the overall structure of the spillway, and the construction process of this type of spillway is complicated. , construction difficulty and long construction period and other shortcomings and shortcomings.

Utility model content

The utility model provides an anti-seepage flexible stepped spillway, which can alleviate the above problems.

In order to alleviate the above-mentioned problems, the technical scheme adopted by the present utility model is as follows:

The utility model provides an anti-seepage flexible stepped spillway, comprising a dam body, the dam body is provided with a spillway chute, a plurality of spillway steps are arranged in the spillway chute, and a plurality of CDASS geotechnical bags are laid on the spillway steps, The CDASS geobag is fixed by anchoring nails,

The structure of the left and right side slopes of the spillway chute is the same, including the inclined side slope of the spillway and the step of the side slope of the spillway. The slopes are connected, and the inclined slopes of the spillway on both sides form an inverted eight-shaped structure;

The exposed part of the entire spillway is fixed and covered with a flexible anti-seepage geocomposite layer by anchoring nails, and the anchoring nails are T-shaped nails with threads processed in the anchoring part;

The CDASS geotechnical bag is filled with cemented soil mixed with lime, cement and soil, and the spillway slope and the spillway slope steps are backfilled with cemented soil.

The technical effect of this technical solution is that the original vertical slope built with geotechnical bags is adjusted and designed to be a combined structure of the spillway slope and the spillway slope, which can better guide the flowing water and more efficient flooding; The backfill soil in the CDASS geobag, the formed backfill soil of the spillway slope and the spillway slope step are all cemented soil mixed with lime, cement and soil, which can better ensure the spillway's erosion resistance and resistance to soil materials. Erosivity and stability of the slope and the chute; the exposed part of the entire spillway is treated with anti-seepage, which effectively prevents the erosion, seepage and scour damage of the water flow to the dam body, and ensures the integrity and reliability of the dam body and the spillway. The anchoring method and material have been re-adjusted and designed, and the original smooth U-shaped nails have been replaced with T-shaped nails with a threaded structure, which increases the effect of anchoring.

Further, the width of the CDASS geobag is larger than the width of the spillway steps, and there is an overlapping portion between adjacent CDASS geobags.

The technical effect of the technical solution is that the overlapping support between adjacent CDASS geo bags ensures the laying stability of the CDASS geo bags.

Further, all the lap joints of the T-shaped nails, the lap joints between the flexible anti-seepage geocomposite layer and the CDASS geobag have been treated with anti-seepage.

Further, the anchoring gap around the T-shaped nail is filled with cement mortar.

The technical effect of the technical solution is to improve the anchoring effect of the T-shaped nail.

Further, the flexible anti-seepage geocomposite layer is formed by connecting several small pieces.

The technical effect of the technical solution is: easy to manufacture and lay.

In order to make the above-mentioned objects, features and advantages of the present utility model more obvious and easy to understand, the following specific embodiments of the present utility model are described in detail in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings that need to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the first state schematic diagram in the spillway construction process in the embodiment;

Fig. 2 is the second state schematic diagram in the spillway construction process in the embodiment;

Fig. 3 is the third state schematic diagram in the spillway construction process in the embodiment;

Fig. 4 is the fourth state schematic diagram in the spillway construction process in the embodiment;

Fig. 5 is the fifth state schematic diagram in the spillway construction process in the embodiment;

Fig. 6 is the state schematic diagram after the construction of the spillway in the embodiment is completed;

Fig. 7 is the side sectional state schematic diagram after the spillway construction is completed in the embodiment;

In the figure: 1-dam body, 2-backwater slope, 3-spillway chute, 4-spillway step, 5-backwater plane of dam body, 6-upper plane of dam body, 7-spillway chute backfill , 8- Spillway slope, 9- Spillway slope ladder, 10-CDASS geotextile bag, 11-T-type nail, 12-Flexible anti-seepage geocomposite layer, 13-Boundary fixed soil tank, 14- Geotextile bag overlap.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described above are a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example

Referring to FIGS. 1 to 7 , the present embodiment provides an anti-seepage flexible stepped spillway, including a dam body 1 . The dam body 1 is provided with a spillway chute 3 , and a number of spillway steps 4 are arranged in the spillway chute 3 . 4. Several CDASS geo bags 10 are laid, and the CDASS geo bags 10 are fixed by anchoring nails. The left and right side slopes of the spillway chute 3 have the same structure, including the spillway slope 8 and the spillway side slope steps 9, and the spillway side slope steps on the same side 9 and the backwater slope 2 of the dam body are connected by the spillway slope 8 on this side, and the spillway slopes 8 on both sides form an inverted eight-shaped structure; the exposed part of the entire spillway is fixed by anchoring nails and covered with flexible The anti-seepage geotechnical composite layer 12, the anchoring nails are T-shaped nails 11 with threads processed in the anchoring part; the CDASS geotechnical bag 10 is filled with cemented soil mixed with lime, cement and soil, the spillway slope 8 and the spillway side slope The steps 9 are all backfilled with cemented soil.

In this embodiment, the CDASS (Check DamSoft Spillway) geotechnical bag is formed by overlapping and stitching the PET cloth and the geotextile; the flexible impermeable geotechnical composite layer 12 uses the hot melt adhesive method to combine the PET cloth, the high-strength geomembrane and the geotextile The materials are overlapped, aligned and bonded.

In this embodiment, parameters such as the mesh density of PET cloth, high-strength geomembrane and geotextile weaving, weaving grammage per unit area, weaving thickness and bonding strength are affected by the gradation of the protected soil and the permeability requirements. factors are determined.

In this embodiment, the spillway slope 8 has two inclination directions, the first inclination direction is the front and rear inclination direction, and the second inclination direction is the left and right inclination direction.

The construction method of the anti-seepage flexible step spillway described in this embodiment is as follows:

S1, along the upper plane 6 of the dam body, the backwater slope slope 2, and the backwater plane 5 of the dam body, excavate the spillway chute 3, and the spillway chute 3 is a channel;

S2. Build spillway steps 4 on the inclined surface of spillway chute 3;

S3, prepare cemented soil;

S4. Backfill the left and right backfill areas in the spillway chute 3 with cemented soil, and reinforce the left and right side walls of the spillway chute 3;

S5. Build a spillway slope 8 and a spillway slope step 9 on the backfill parts on the left and right sides of the spillway chute 3;

S6. Lay the CDASS geobag 10 on the spillway step 4, fill the CDASS geobag 10 with cemented soil, use the T-shaped nails 11 to anchor the CDASS geobag 10, sew the bag mouth of the CDASS geobag 10, and install the CDASS geobag 10. The surface of bag 10 is painted with cyanide;

S7. When the cyanide coated on the surface of the CDASS geobag 10 changes from liquid to viscous or has a wire-drawing feature, lay a flexible anti-seepage geocomposite layer 12 on the exposed part of the current spillway, and fix it with T-shaped nails 11 ;

S8. Brush the surface of the laid flexible anti-seepage geocomposite layer 12 with cyanide 3 times, and the brushing interval is 12-24 hours;

S9. Excavate the boundary fixed soil grooves 13 on the backwater slope 2 on the left and right sides of the current spillway, and press the left and right sides of the flexible anti-seepage geocomposite layer 12 to the boundary fixed soil on both sides through backfill and T-shaped nails. In tank 13, the construction of the spillway is completed.

In this embodiment, the used flexible anti-seepage geocomposite layer 12 and CDASS geotextile bag 10 are both resistant to high-speed water erosion, 5.5m/s without damage; freezing for 6 days under -40°C severe cold conditions and light radiation intensity 550w/㎡, the tensile strength of continuous light for 150 hours is greater than 95%, with excellent aging resistance and frost resistance; and the material meets the requirements of monofilament bidirectional tensile strength greater than 0.19KN/piece, double-sided wide-width tensile strength greater than 80KN/m and CBR Excellent technical index with bursting strength greater than or equal to 6KN.

In this embodiment, according to the slope stability, the gradation of soil materials and the slope strength requirements of the spillway, the mixing ratio of lime, cement and soil material in the cemented soil is determined, and the mixture is stirred until uniform to ensure the slope of the spillway. Slope 8 strength and CDASS geobag 10 strength requirements.

In this embodiment, the width of the CDASS geobags 10 is greater than the width of the spillway steps 4 , and there is an overlapping portion 14 between adjacent CDASS geobags 10 . During the construction of the spillway step 4, it is necessary to trim the uneven part of the spillway step 4. According to the flow velocity, flow rate, flow state, force on the step and energy dissipation rate of the spillway, determine the spillway step 4 and its related The size of the matching CDASS geobag 10, the arrangement density of the T-shaped nails 11 used when the CDASS geobag 10 is fixed, and the overlapping length of the adjacent CDASS geobags 10.

In the present embodiment, when the spillway slope 8 and the spillway slope step 9 are constructed on the backfill parts 7 of the spillway on both sides, the spillway slope 8 is determined according to the slope strength requirements and the slope stability requirements of the spillway. The slope ratio and width of the spillway slope step 9.

In this embodiment, at the lap joint of adjacent CDASS geo bags 10, a layer of cyanide is first applied to prevent seepage. After the first layer of cyanide is air-dried, a second layer of cyanide is applied, and then the CDASS geo bags 10 are laid. Or the flexible anti-seepage geocomposite layer 12, the second layer of which is cyanide-coagulated for anti-seepage and bonding functions. After the bonding is completed, it is fixed with T-shaped nails 11. After the fixing is completed, glass glue is used to fix the fine gaps. Perform secondary anti-seepage treatment. All the lap joints of the T-shaped nails 11 and the lap joints between the flexible anti-seepage geocomposite layer 12 and the CDASS geobag 10 have been treated with anti-seepage. Among them, the coating interval of each layer of cyanide condensation in its anti-seepage project needs to be determined by factors such as temperature and humidity. Generally, the interval time is 12-24 hours, and the cyanide condensation layer that plays a role in bonding needs to be viscous. Proceed to the next step when there is a wire-like feature.

In this embodiment, each time a CDASS geobag 10 is laid, cemented soil filling, T-nail 11 anchoring, bag opening stitching, and cyanide coating are performed on the currently laid CDASS geobag 10. 10 After the cyanide coating is completed, and the viscous or stringy features appear, the next CDASS geobag 10 is laid.

In this embodiment, the flexible anti-seepage geocomposite layer 12 is formed by stitching and connecting several small pieces.

In this embodiment, the anchoring gap around the T-shaped nail 11 is filled with cement mortar, and the fixing method of the T-shaped nail 11 adopts the grouting anchoring method. First, the T-shaped nail 11 is nailed to a certain depth and pulled out, and the cement mortar is poured into Wherein, all the T-shaped nails 11 are then nailed to be fixed.

In step S8 of this embodiment, the specific operation is: excavate a boundary fixed soil groove 13 in parallel at a certain distance from the side slopes on both sides of the spillway, and place the edge of the flexible anti-seepage geocomposite layer 12 on the boundary fixed soil groove 13 , and use T-shaped nails 11 to fix it. After the fixing is completed, use the layered compaction method to backfill the boundary fixed soil trench 13. The distance between the boundary fixed soil groove 13 and the slope of the spillway and its specific size are determined according to factors such as the discharge flow of the spillway, the scour and erosive force of the water flow on the material.

In this embodiment, step S4 specifically includes: building left and right formwork in the spillway chute, forming a backfill area between the left and right formwork and the left and right side walls of the spillway chute respectively; backfilling cementitious soil in layers to the left and right backfilling For each backfill layer of cemented soil, the cemented soil of the current layer is compacted with a tamping machine. The compaction standard is determined according to the compaction test of the cemented soil, and it is necessary to ensure that the compaction density of the cemented soil is not less than 0.98 times the maximum dry density.

In step S6 of this embodiment, the cemented soil is filled into the CDASS geobag 10 by the layered compaction method.

In this embodiment, the construction process at the entrance of the spillway chute is as follows: first, brush a layer of cyanide on the left and right walls of the entrance; attach the flexible anti-seepage geocomposite layer 12 to it; brush a layer of the flexible anti-seepage geocomposite layer 12 After the layer of cyanide is solidified, a rubber strip of a certain width is bonded to the surface, and a layer of cyanide is applied to the other side of the rubber. Then, the steel bars of the same width as the rubber are bonded together, and an electric drill is used to punch holes at equal distances on it. ; Put the expansion bolts in the drilled holes and tighten them to prevent the water flow from pouring into the flexible anti-seepage geocomposite layer 12, which will damage the spillway and the dam structure. Among them, each time the cyanide gel is painted, it needs to be viscous or stringy before proceeding to the next step.

In this embodiment, after the construction of the spillway is completed, it is necessary to check the lap joints and seams between each flexible anti-seepage geocomposite layer 12 and the CDASS geobag 10 and between the flexible anti-seepage geocomposite layer 12 and the T-shaped nail 11 Whether the place is strictly anti-seepage to ensure the integrity and reliability of the flexible anti-seepage step spillway.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (5)

1. an anti-seepage flexible step spillway, comprising a dam body, the dam body is provided with a spillway chute, a number of spillway steps are provided in the spillway chute, and the spillway steps are laid with some CDASS geotechnical bags, the CDASS The geotechnical bag is fixed by anchoring nails, and is characterized in that: The structure of the left and right side slopes of the spillway chute is the same, including the inclined side slope of the spillway and the step of the side slope of the spillway. The slopes are connected, and the inclined slopes of the spillway on both sides form an inverted eight-shaped structure; The exposed part of the entire spillway is fixed and covered with a flexible anti-seepage geocomposite layer by anchoring nails, and the anchoring nails are T-shaped nails with threads processed in the anchoring part; The spillway slope and the spillway slope steps are all backfilled with cemented soil. 2 . The anti-seepage flexible stepped spillway according to claim 1 , wherein the width of the CDASS geobag is larger than the width of the spillway steps, and there is an overlapping portion between adjacent CDASS geobags. 3 . 3. The anti-seepage flexible step spillway according to claim 1 is characterized in that, the lap joints between all T-nails, the lap joints between the flexible anti-seepage geocomposite layer and the CDASS geo bags have been treated with anti-seepage . 4 . The anti-seepage flexible stepped spillway according to claim 1 , wherein the anchoring gap around the T-shaped nail is filled with cement mortar. 5 . 5 . The anti-seepage flexible stepped spillway according to claim 1 , wherein the flexible anti-seepage geocomposite layer is formed by connecting several small parts. 6 .

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