CN217870559U - Inclined wall geomembrane earth-rock cofferdam structure suitable for higher manger plate flood peak of geomembrane - Google Patents

Abstract

The utility model discloses an inclined wall geomembrane earth-rock cofferdam structure suitable for a geomembrane with a higher water retaining head, which comprises a cofferdam body, a seepage-proofing wall arranged at the water facing side of the cofferdam body and a protective structure arranged at the top of the seepage-proofing wall and having a certain width; a berm with a certain width is arranged on a slope between the protective structure and the top of the cofferdam body, and a geomembrane is laid on the slope from top to bottom; all be provided with the anchor ditch that is used for fixed geomembrane on cofferdam body top and the packway, wherein the packway sets up two anchor ditches. The structural form has the characteristics of small difficulty in geomembrane welding construction, simple and convenient construction of the transverse expansion joint, high safety and stability of the cofferdam side slope and the like.

Description

Inclined wall geomembrane earth-rock cofferdam structure suitable for high water retaining head of geomembrane

technical field

The utility model relates to the field of temporary water retaining in the upper reaches of rivers in the dry land construction of foundation pits of enclosing key projects in large and medium-sized water conservancy and hydropower projects, in particular to an inclined-wall geomembrane earth-rock cofferdam structure suitable for relatively high water retaining head of the geomembrane.

Background technique

Inclined wall geomembrane earth-rock cofferdam has the characteristics of fast rising of weir body filling, convenient welding of geomembrane laying, non-interference between weir body filling and geomembrane laying, and convenient maintenance in the later period, etc., and has been widely used in water conservancy and hydropower construction projects , the water retaining head of the inclined wall geomembrane is generally below 35m. With the development and construction of a number of giant hydropower projects in the west, such as the upstream inclined wall geomembrane earth-rock cofferdam of the two hydropower projects of Jinping I and Baihetan, the inclined wall geomembrane The water retaining head of the membrane has reached 43m, which has been greatly improved. In the case of a high retaining head (greater than 35m) of the inclined wall geomembrane, the single-stage slope of the cofferdam where the geomembrane is laid is relatively high. Due to the lack of a working platform in the middle, the construction and welding of the geomembrane are more difficult, which indirectly affects the geomembrane. Second, the design of the geomembrane retains water with a high water head, and the deformation increases accordingly after retaining the water. Corresponding expansion joints need to be installed. On the slope of a relatively high single-stage cofferdam earth-rock slope, the installation and construction of expansion joints is very inconvenient , which affects the construction quality of the geomembrane and the anti-seepage performance after water blocking; finally, for a relatively high (greater than 35m) single-stage cofferdam earth-rock slope, the interlayer stability between the geomembrane and the cofferdam slope cushion is weak. If the requirements are not met locally, under the action of gravity, it may affect the stability between the geomembrane and the surrounding rock slope cushion on the entire slope above.

Based on the above situation, the utility model proposes an inclined-wall geomembrane earth-rock cofferdam structure suitable for a relatively high retaining head of the geomembrane, which can effectively solve the above problems.

Utility model content

In order to solve the above problems, the main purpose of this utility model is to provide a kind of oblique wall geomembrane cofferdam structure type suitable for geomembrane higher water retaining head (greater than 35m). It has the characteristics of simple and convenient construction and high safety and stability of cofferdam slope.

In order to solve the above technical problems, the utility model is realized through the following technical solutions:

It is suitable for the inclined wall geomembrane earth-rock cofferdam structure with high water retaining head of the geomembrane, including the cofferdam body, the cut-off wall on the upstream side of the cofferdam body, and the protective structure with a certain width arranged on the top of the cut-off wall; The slope between the protective structure and the top of the cofferdam body is provided with a certain width of the horseway, and the geomembrane is laid on the slope from top to bottom; the top of the cofferdam body and the horseway are all provided with anchors for fixing the geomembrane. Ditch, in which the double anchoring ditch is set on the horseway, so that the geomembrane layout is in the shape of a few characters.

Preferably, concrete slabs are arranged on both sides of the cofferdam body, the geomembrane is connected to the cap concrete on the top of the cutoff wall and the concrete slab by embedding or anchoring, and the bottom of the cutoff wall and the concrete Curtain grouting is arranged on the board to form a closed anti-seepage system.

Preferably, the cofferdam body includes an anti-seepage section below the elevation of the protective structure and a water-retaining section above the elevation, and the anti-seepage section includes large stones, second transition material, and fine gravel arranged in sequence along the water flow direction. material, the first gravel material, the first transition material, the intercepting embankment, the second gravel material and the drainage prism, and the water retaining section includes the rolled gravel material located above the anti-seepage section.

Further preferably, the cut-off embankment is located on the downstream side of the cut-off wall, and the horizontal distance between the slope foot of the cut-off dike on the upstream side and the axis of the cut-off wall is not less than 15m.

Preferably, two geomembrane anchoring grooves are also arranged on the horseway, and the geomembrane is arranged in a zigzag shape and also functions as an expansion joint.

Preferably, shotcrete is provided above the geomembrane, and a cushion material and a third transition material are laid below.

Preferably, a zigzag road is arranged on the backwater side of the cofferdam body to the foundation pit on the backwater side of the cofferdam, and the width of the zigzag road is 5m-10m.

Preferably, the slope ratio of the slope above the protection structure elevation is 1:2-2.5, the slope ratio of the slope below is 1:1.5, and the slope ratio of the backwater side is 1:1.6-1.8.

Preferably, the protective structure is not less than 20m in width, and consists of dry block stones, fourth transition material, cushion material and gravel soil arranged in sequence from top to bottom.

Preferably, the width of the carriageway is 3m-5m.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

(1) A horse path is set in the middle of the weir slope under the geomembrane of the inclined wall, which reduces the operation height of the single-stage slope, increases the operating platform, facilitates the construction and welding of the geomembrane, and is conducive to improving the welding quality of the geomembrane and the water-retaining performance of the geomembrane; ( 2) Set a first-level horse track in the middle of the weir slope where the inclined wall geomembrane is laid, which improves the stability of the slope on the water face of the cofferdam; The function of the expansion joint improves the layer stability between the geomembrane and the weir slope, and at the same time helps to adapt to the deformation of the geomembrane and reduces the possibility of tearing and damage of the geomembrane.

Description of drawings

Fig. 1 is a schematic diagram of the cofferdam plane layout structure of the present utility model;

Fig. 2 is a schematic diagram of a typical section structure of a cofferdam of the present utility model;

Fig. 3 is a schematic diagram of the detailed structure of the protective structure at A in Fig. 2;

Fig. 4 is a schematic diagram of the detailed structure of the horse track at B in Fig. 2 .

Reference signs: 1—curtain grouting; 2—concrete slab; 3—horse path; 4—"zigzag" road; 5—closing embankment; 601—first transition material; Transition material; 604—the fourth transition material; 701—the first gravel material; 702—the second gravel material; 8—fine gravel material; 9—impervious wall; 901—capping concrete; 10—large stone; 11—Drainage prism; 12—Rolled gravel material; 13—Cushion material; 14—Geomembrane; 15—Shotcrete; 16—Gravel soil; 17—Dry block stone; 18—Cover layer; 19— bedrock.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the preferred embodiments of the present utility model are described below in conjunction with specific examples, but it should be understood that the accompanying drawings are only for illustrative purposes and cannot be interpreted as a description of the present invention. Patent restrictions; in order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, some known structures and their It is understandable that the description may be omitted. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.

The utility model will be further described below in conjunction with accompanying drawings 1 to 4 and the embodiments, but not as a basis for limiting the utility model.

As shown in Figures 1 to 4, this embodiment provides an inclined-wall geomembrane earth-rock cofferdam structure suitable for a relatively high retaining head of the geomembrane, including a cofferdam body and an anti-seepage wall arranged on the upstream side of the cofferdam body 9 and a protective structure with a certain width arranged on the top of the cutoff wall 9; a horseway 3 with a certain width is arranged on the slope between the protective structure and the top of the cofferdam body, and a geomembrane 14 is laid on the slope from top to bottom; Both the top of the cofferdam body and the horseway 3 are provided with double anchoring grooves for fixing the geomembrane 14, and the geomembrane 14 on the horseway 3 combines the double anchorage grooves to form a few characters, which also acts as a telescopic joint. The width is 3m ~ 5m. Above the geomembrane 14 is sprayed concrete 15cm-20cm, the sprayed concrete 15 is divided into blocks of 3m×3m, and the cushion material 13 and the third transition material 603 are laid below.

In this embodiment, the cofferdam body includes an anti-seepage section below the elevation of the protective structure and a water-retaining section above the elevation, and the anti-seepage section includes large stones 10, second transition materials 602, Fine gravel material 8, the first gravel material 701, the first transition material 601, the intercepting embankment 5, the second gravel material 702 and the drainage prism 11, the water retaining section includes a rolling mill located above the anti-seepage section Gravel material 12. A zigzag road 4 is arranged on the backwater side of the cofferdam body to the foundation pit on the backwater side of the cofferdam, and the width of the zigzag road 4 is 5m-10m.

In this embodiment, concrete slabs 2 are arranged on both sides of the cofferdam body, and the geomembrane 14 is connected to the capping concrete 901 on the top of the cutoff wall 9 and the concrete slab 2 by embedding or anchoring. The curtain grouting 1 is arranged on the bottom of the cutoff wall 9 and the concrete slab 2. The curtain grouting 1 is determined to pass through the covering layer 18 and penetrate into the bedrock 19 to a certain depth according to the requirements of relevant specifications, forming a closed seepage prevention system.

Further, the cut-off dike 5 is located on the downstream side of the cut-off wall 9, and the horizontal distance between the toe of the cut-off dike 5 on the upstream side and the axis of the cut-off wall 9 is not less than 15m.

In this embodiment, the slope ratio of the slope above the protection structure elevation is 1:2-2.5, the slope ratio of the slope below is 1:1.5, and the slope ratio of the backwater side is 1:1.6-1.8. The protective structure is not less than 20m in width, and consists of dry block stones 17 , fourth transition material 604 , cushion material 13 and gravel soil 16 arranged in sequence from top to bottom.

Based on the above structure, the present embodiment also provides a construction method of a cofferdam structure, comprising the following steps:

1. Filling of the part below the elevation of the protective structure

Excavate and support the bank slopes on both sides of the cofferdam, pour concrete slabs on both sides of the bank slope 2 → fill in the closure embankment 5, start curtain grouting 1 construction in the traffic tunnel on both sides → fill the first transition material 601 upstream of the embankment → fine stone Filling with slag material 8→filling with first gravel material 701, filling with second transition material 602→filling with large stone 10→filling with drainage prism 11→filling with second gravel material 702.

2. Filling of the part above the elevation of the protective structure

Filling of the rolled gravel material 12 → filling of the third transition material 603 and cushion material 13.

3. Construction of anti-seepage wall 9

After the large stone 10 is completed, the construction of the anti-seepage wall 9 and the curtain grouting 1 at the bottom of the anti-seepage wall 9 is started while other parts are being filled.

3. Construction of geomembrane 14

Excavate double anchorage ditch at position 3 of the middle roadway → Lay geomembrane 14 from top to bottom along the upstream slope of the cofferdam → Geomembrane 14 is embedded with the capping concrete 901 on the top of the cut-off wall 9 and the concrete slabs 2 on both sides of the bank Or anchoring mode connection → filling the cushion material 13 with the geomembrane 14 at the anchoring ditch.

4. Sprayed concrete 15 construction

Spray 20cm thick concrete on the surface of the geomembrane 14, and the sprayed concrete 15 is divided into joints according to 3m×3m.

5. Construction of protective structure

Fill in gravel soil 16, cushion material 13, fourth transition material 604, and dry block stone 17 sequentially from bottom to top.

According to the description and drawings of the utility model, those skilled in the art can easily manufacture or use the oblique wall geomembrane earth-rock cofferdam structure of the utility model which is suitable for the higher retaining head of the geomembrane, and can produce the structure described in the utility model. positive effect.

Unless otherwise specified, in the present utility model, if there are terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", Orientation or position indicated by "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, the terms describing orientation or positional relationship in the utility model are only used for exemplary illustration, and cannot be interpreted as a limitation to this patent. Concrete meaning. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.

Unless otherwise clearly stipulated and limited, in the present utility model, if there are terms "setting", "connecting" and "connecting", they should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated Connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal connection between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification or equivalent change made to the above embodiments according to the technical essence of the utility model falls within the scope of the present utility model. Within the protection scope of the present utility model "of".

Claims (10)

1. Inclined wall geomembrane earth rock cofferdam structure suitable for the higher manger plate flood peak of geomembrane, its characterized in that: the cofferdam comprises a cofferdam body, an impervious wall (9) arranged on the water facing side of the cofferdam body and a protective structure with a certain width arranged at the top of the impervious wall (9); a ramp between the protective structure and the top of the cofferdam body is provided with a berm (3) with a certain width, and a geomembrane (14) is paved on the ramp from top to bottom; and the top of the cofferdam body and the pavement (3) are both provided with anchoring ditches for fixing the geomembrane (14).

2. The inclined-wall geomembrane earth rock cofferdam structure suitable for the higher water-retaining head of geomembrane of claim 1, characterized in that: concrete plates (2) are arranged on bank slopes on two sides of the cofferdam body, the geomembrane (14) is connected with the cap concrete (901) on the top of the impervious wall (9) and the concrete plates (2) in a burying or anchoring mode, and curtain grouting (1) is arranged on the bottom of the impervious wall (9) and the concrete plates (2) to form a closed impervious system.

3. The inclined-wall geomembrane earth rock cofferdam structure suitable for the higher water-retaining head of geomembrane of claim 1, characterized in that: the cofferdam body comprises an anti-seepage section below the elevation of the protective structure and a water retaining section above the elevation, the anti-seepage section comprises large stones (10), second transition materials (602), fine stone slag materials (8), first stone slag materials (701), first transition materials (601), a closure dike (5), second stone slag materials (702) and a drainage ridge body (11) which are sequentially arranged along the water flow direction, and the water retaining section comprises rolling stone slag materials (12) located above the anti-seepage section.

4. The inclined-wall geomembrane earth rock cofferdam structure suitable for the higher water-retaining head of geomembrane of claim 3, characterized in that: the interception dike (5) is positioned at the downstream side of the impervious wall (9), and the horizontal distance between the water-facing side slope foot of the interception dike (5) and the axis of the impervious wall (9) is not less than 15m.

5. The inclined-wall geomembrane earth rock cofferdam structure suitable for the higher water-retaining head of geomembrane of claim 1, characterized in that: the geomembrane on the berm (3) is combined with the double anchoring ditches to be shaped like a Chinese character 'ji', and the geomembrane also plays a role of an expansion joint.

6. The inclined-wall geomembrane earth-rock cofferdam structure suitable for the geomembrane with the higher water retaining head according to claim 1, characterized in that: concrete spraying (15) is arranged above the geomembrane (14), and a bedding material (13) and a third transition material (603) are laid below the geomembrane.

7. The inclined-wall geomembrane earth rock cofferdam structure suitable for the higher water-retaining head of geomembrane of claim 1, characterized in that: the backwater side of the cofferdam body is provided with a zigzag road (4) to a foundation pit at the backwater side of the cofferdam, and the width of the zigzag road (4) is 5-10 m.

8. The inclined-wall geomembrane earth-rock cofferdam structure suitable for the geomembrane with the higher water retaining head according to claim 1, characterized in that: the slope ratio of the side slope above the elevation of the protective structure is 1:2-2.5, the slope ratio of the side slope below the elevation of the protective structure is 1.5, and the slope ratio of the backwater side is 1.6-1.8.

9. The inclined-wall geomembrane earth-rock cofferdam structure suitable for the geomembrane with the higher water retaining head according to claim 1, characterized in that: the width of the protective structure is not less than 20m, and the protective structure comprises dry masonry stones (17), a fourth transition material (604), a bedding material (13) and gravel soil (16) which are sequentially arranged from top to bottom.

10. The inclined-wall geomembrane earth rock cofferdam structure suitable for the higher water-retaining head of geomembrane of claim 1, characterized in that: the width of the pavement (3) is 3-5 m.

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