CN215715041U - Full storehouse basin PE geomembrane prevention of seepage panel arrangement structure - Google Patents
Full storehouse basin PE geomembrane prevention of seepage panel arrangement structure Download PDFInfo
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- CN215715041U CN215715041U CN202023175117.3U CN202023175117U CN215715041U CN 215715041 U CN215715041 U CN 215715041U CN 202023175117 U CN202023175117 U CN 202023175117U CN 215715041 U CN215715041 U CN 215715041U
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Abstract
The utility model discloses a full-warehouse basin PE geomembrane anti-seepage panel arrangement structure which comprises a warehouse slope and a warehouse bottom, wherein PE geomembrane anti-seepage panels with certain thicknesses are uniformly spread on the warehouse slope and the warehouse bottom; a first concrete connecting structure is circumferentially arranged at the plane turning joint between the warehouse slope and the warehouse bottom, and two side edges of the first concrete connecting structure are respectively connected with the PE geomembrane anti-seepage panels paved on the warehouse slope and the warehouse bottom by water stop anchoring parts; a second concrete connecting structure is uniformly arranged at the joint of the turning of the vertical surface of the warehouse slope, and two side edges of the second concrete connecting structure are respectively connected with the PE geomembrane anti-seepage panel paved on the warehouse slope by adopting a water-stopping anchoring part; the first concrete connecting structure is connected with the second concrete connecting structure through a water stopping anchoring part. The arrangement structure is simple in structure and small in construction difficulty, is connected with the PE geomembrane and adopts a mechanical anchoring structure, is verified in a plurality of hydraulic and hydroelectric projects, and is reliable in anti-seepage structure.
Description
Technical Field
The utility model relates to the field of hydroelectric and hydraulic engineering, in particular to a full-warehouse basin PE geomembrane anti-seepage panel arrangement structure.
Background
In recent years, geomembrane seepage prevention technology is widely applied to seepage prevention design of reservoirs and dams. When the reservoir adopts the full-reservoir basin geomembrane for seepage prevention, a PVC geomembrane and a PE geomembrane can be adopted. The PVC geomembrane with good quality is expensive in manufacturing cost, and the price of the PVC geomembrane is generally 5-10 times that of the PE membrane. Therefore, the PE film with low price and good anti-seepage effect is often selected in engineering design and construction.
For the hydroelectric hydraulic engineering adopting the PE film full-warehouse basin for seepage prevention, the following problems mainly exist:
1. in the engineering with a high water seepage prevention head (more than 30m), a thick film with the thickness of more than 1.0mm has to be adopted, but the PE film is difficult to wrinkle (particularly, the thick film with the thickness of more than 1.0 mm), and particularly, in the turning position of a plane and a vertical surface, because the design body type is not good, the phenomenon of obvious wrinkle and wave after the PE film is laid and welded is caused.
2. The PE film has the characteristic of high expansibility, and has a larger thermal expansion coefficient than other types of geomembranes such as PVC. Because certain temperature difference exists in one day, after the geomembrane is paved, particularly in the high-temperature period at noon in summer, the phenomena of 'wave', wrinkle and the like often occur.
As shown in fig. 6, in the range of 20-50 ℃, the PE film has a higher coefficient of thermal expansion change rate than geomembranes such as PVC, so the PE film is in a contracted and expanded state in an area environment with large day-night temperature difference, and has poor dimensional stability.
In Aguide to polymeric gels, by John Scheirs, it is stated that the surface temperature of the article varies from 20 ℃ to 70 ℃ during the day of solar irradiation, with PE giving 100mm elongation and PVC only 60mm elongation per 10m length of material.
3. The research at home and abroad finds that: the geomembrane ages quickly when under tension at high stress levels and slowly at low stress levels. The stress level is limited below 20%, and the durability of the geomembrane can meet engineering requirements. The stress and strain safety coefficients of the geomembrane are not less than 5.0 according to the current specification. Finite element method analysis and calculation of a plurality of projects show that the stress level of the geomembrane is usually far more than 20% and the tensile strain is more than 3% at turning positions of planes and facades, and the safety factor is considered to be 5.0, so that the requirements of specification and durability can not be met.
4. In some hydroelectric hydraulic engineering which adopts the PE film full-reservoir basin for seepage prevention at home and abroad, after the reservoir stores water, the PE film is wrinkled and the turning part has serious seepage, and the reservoir has to be emptied for repair. The reason for this is mainly that after water retention water pressure is exerted on the folded geomembrane, resulting in local stress concentrations, especially when wrinkles appear at the welds. In the case of damaged geomembranes, the risk of infiltration, breakage of the geomembrane is greatly increased due to the lack of direct contact of the corrugated portion with the lower support layer.
How to ensure the structural quality of the PE geomembrane seepage-proofing panel and reduce the leakage loss of the reservoir through certain measures is an important technology in the design and operation of hydropower engineering.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide the full-reservoir basin PE geomembrane seepage-proofing panel arrangement structure and the construction method which are convenient, safe and reliable in construction, so that the adverse conditions of bulging, wrinkling, cracking and the like of a PE geomembrane seepage-proofing panel seepage-proofing body are avoided, and the leakage loss of a reservoir is reduced.
In order to solve the technical problems, the utility model is realized by the following technical scheme:
on one hand, the utility model provides a full-warehouse basin PE geomembrane anti-seepage panel arrangement structure, which comprises a warehouse slope and a warehouse bottom, wherein PE geomembrane anti-seepage panels with certain thicknesses are uniformly spread on the warehouse slope and the warehouse bottom; a first concrete connecting structure is circumferentially arranged at a plane turning joint between the warehouse slope and the warehouse bottom, and two side edges of the first concrete connecting structure are respectively connected with the PE geomembrane anti-seepage panels paved on the warehouse slope and the warehouse bottom by water-stopping anchoring parts; and second concrete connecting structures are uniformly distributed at the joint of the turning of the vertical surface of the warehouse slope, and two side edges of each second concrete connecting structure are respectively connected with the PE geomembrane anti-seepage panels paved on the warehouse slope by water stop anchoring parts.
As a preferred technical scheme of the utility model, lower supporting layers are densely filled between the PE geomembrane anti-seepage panel and the reservoir bottom and between the PE geomembrane anti-seepage panel and the reservoir slope respectively.
As a preferred technical scheme of the utility model, an upper protective layer is pressed and covered on the PE geomembrane anti-seepage panel corresponding to the bottom of the reservoir.
As a preferred technical scheme of the utility model, a first water-stop anchoring part is adopted between the first concrete connecting structure and the second concrete connecting structure and between the first concrete connecting structure and the PE geomembrane anti-seepage panel for anchoring and sealing treatment.
As a preferable technical scheme of the utility model, the second water stop anchoring pieces are arranged at the structural seams of the first and second concrete connecting structures for anchoring and sealing treatment.
As a preferred technical solution of the present invention, the first concrete connection structure is a concrete slab at the bottom of a warehouse or a concrete drainage observation corridor.
As a preferred technical solution of the present invention, the second concrete connection structure is a bank slope concrete connection plate.
As a preferred technical scheme of the utility model, the PE geomembrane anti-seepage panel adopts a composite geomembrane with a two-cloth one-film structure, the specifications of the upper and lower layers of geotextile are 10 kN/m-20 kN/m, and the thickness of the geomembrane is 1 mm-2 mm.
As a preferable technical scheme of the utility model, a cushion layer is arranged between the upper protective layer and the PE geomembrane anti-seepage panel, and the cushion layer can adopt mortar, foam plastic sheets or needle-punched geotextile.
As a preferable technical scheme of the utility model, the lower supporting layer comprises two layers of an upper padding material and a lower padding material, wherein the upper padding material is rolled and filled by medium-fine sand with the thickness of 10-20 cm, and the lower padding material is filled by gravels with the thickness of 40-60 cm.
On the other hand, the utility model also provides a construction method of the full-warehouse basin PE geomembrane anti-seepage panel arrangement structure, which comprises the following steps:
s1, constructing a bank slope and a bank bottom, performing layered rolling and filling of a lower supporting layer on the bank slope or the bank bottom, and removing the oversize particles on the surface;
s2, pouring a first concrete connection structure at the plane turning joint between the warehouse slope and the warehouse bottom, and constructing a second water-stopping anchoring piece at the concrete structure joint for anchoring and sealing treatment;
s3, pouring a second concrete connection structure at the vertical face turning joint of the storehouse slope, and constructing a second water-stopping anchoring piece at the concrete structure joint for anchoring and sealing treatment;
s4, paving PE geomembrane anti-seepage panels on the warehouse slope and the warehouse bottom, and constructing a first water-stop anchoring piece at the joint of the PE geomembrane anti-seepage panels and the first concrete connecting structure and the second concrete connecting structure for anchoring and sealing;
and S5, paving the upper protective layer on the PE geomembrane anti-seepage panel at the bottom of the reservoir, and pressing and forming.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
1. concrete connecting structures are arranged at the plane and vertical face turning connecting parts of the reservoir basin, so that parts which are changed violently and stressed unfavorably are borne by the concrete connecting structures, and the PE geomembrane anti-seepage panel is in a plane stress state no matter on a reservoir slope or at the reservoir bottom, so that the PE geomembrane anti-seepage panel is in a good stress state, and is prevented from bearing large tensile strain at a turning part.
2. The geomembrane is stressed on the plane to arrange the shape, so that the geomembrane is always in a low stress level and low tensile strain state, and the durability of the geomembrane is fully guaranteed.
3. The PE film, particularly the thick PE film, is difficult to wrinkle, and has no turning arrangement structure, so that adverse conditions such as wrinkles, waves and the like which are possibly generated are avoided to the maximum extent, the geomembrane is ensured to be tightly attached to the lower supporting layer, and the geomembrane is difficult to be pulled to crack after the reservoir stores water.
4. The concrete connection structure is simple in structure and small in construction difficulty, is connected with the PE geomembrane and adopts a mechanical anchoring structure, is verified in a plurality of hydraulic and hydroelectric projects, and is reliable in anti-seepage structure.
5. The design of the seepage-proofing structure of the reservoir basin is reasonable, so that the difficulty of paving and welding the geomembrane is greatly reduced, and the construction quality of the seepage-proofing structure of the reservoir basin is ensured.
6. A concrete connecting plate or a drainage observation gallery is arranged at a turning position (a junction of a warehouse slope and a warehouse bottom) of the vertical face, a natural leakage monitoring subarea is formed between the warehouse slope connecting plate and the warehouse bottom connecting plate or the drainage gallery, and monitoring and overhauling are more convenient.
7. The engineering quantity of the concrete connecting plate is small, and the seepage-proofing investment of the warehouse basin cannot be greatly increased.
Drawings
Fig. 1 is a plan view of a full warehouse basin PE geomembrane impermeable panel arrangement structure of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is an enlarged view of the nail of FIGS. 2 and 3;
FIG. 5 is an enlarged view of point B in FIG. 3;
FIG. 6 is a comparison of the coefficients of thermal expansion of different materials as mentioned in the background.
Reference numerals: 1-PE geomembrane anti-seepage panel; 2-a second concrete connection structure; 3-a first concrete connection structure; 4-a first water stop anchor; 5-a second water stop anchor; 6-lower support layer; 7-stone or foundation.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The present invention will be further described with reference to the following examples and figures 1-6, but the utility model is not limited thereto.
As shown in fig. 1 to 6, the embodiment is suitable for the hydropower engineering of the whole reservoir basin adopting the PE geomembrane seepage-proofing panel for seepage prevention, and the seepage-proofing effect of the reservoir is ensured and the seepage loss of the reservoir is reduced by arranging the reasonable seepage-proofing structure. The waterproof structure mainly comprises a PE geomembrane impermeable panel 1, a second concrete connecting structure 2, a first concrete connecting structure 3, a first waterproof anchoring piece 4, a second waterproof anchoring piece 5, an upper protective layer (not shown in the figure), a lower supporting layer 6 and stone or foundation 7. In this embodiment, the second concrete connection structure 2 is a bank slope concrete connection plate, and the first concrete connection structure 3 is a bank bottom concrete connection plate or a concrete drainage observation corridor.
The PE geomembrane impermeable panel 1 generally adopts a two-cloth one-film design, and a composite geomembrane or a geomembrane with separated film and cloth can be used. According to the engineering importance, the specification of the upper and lower layers of geotextile is 10 kN/m-20 kN/m; the thickness of the geotechnical film is determined by calculation according to the acting water head, the characteristics of the lower supporting layer 6 and the like, and is generally 1 mm-2 mm. The geomembrane is anchored on a storehouse slope concrete connecting plate or a storehouse bottom concrete connecting plate and a drainage observation corridor through a first water-stopping anchoring part 4. The geomembrane adopts a convex or concave structure at the joint part so as to reserve the deformation amount generated by the action of water pressure. And an upper protective layer is adopted on the reservoir bottom geomembrane for covering protection.
For the concrete connecting plate of the storehouse slope, the concrete connecting plate is arranged at the turning part inside the storehouse slope and is anchored with the PE geomembrane anti-seepage panel 1 of the storehouse slope through the first water-stop anchoring part 4. The thickness of the concrete connecting plate is determined by calculation according to the hydraulic gradient, the hydraulic gradient is generally less than 150, the thickness is within 1m, the width is preferably about 12 m-16 m, the grade of the concrete is not lower than C25, and the concrete connecting plate is secondary-graded and single-layer bidirectional reinforcing bars.
For the concrete connecting plate or the drainage observation gallery at the bottom of the reservoir, the concrete connecting plate or the drainage observation gallery is arranged at the junction of the reservoir slope and the reservoir bottom and is anchored with the reservoir slope and the PE geomembrane anti-seepage panel 1 at the bottom of the reservoir through the first water-stop anchoring part 4. In order to facilitate seepage-proofing monitoring and maintenance of the reservoir, a concrete drainage observation gallery can be combined with a connecting plate for arrangement. The width of the concrete connecting plate at the bottom of the reservoir is preferably 4-7 m, the length is determined according to the settlement deformation calculation of the bottom of the reservoir, the grade of the concrete is not lower than C25, and the concrete is in secondary distribution and single-layer bidirectional reinforcing bars. The drainage observation corridor is provided with structural joints every 12-16 m, the joints are sealed by a second water-stopping anchoring piece 5, the grade of concrete is not lower than C25, and the structural joints are secondary-graded and double-layer bidirectional reinforcing bars.
Further, roughening the anchoring parts on the bank slope concrete connecting plate or the bank bottom concrete connecting plate and the drainage observation corridor, leveling by adopting an SR leveling layer, paving a layer of SR anti-seepage adhesive tape, covering the PE geomembrane anti-seepage panel 1, covering an SR anti-seepage protective cover sheet, fixing by adopting a stainless steel plate, and anchoring by adopting a stainless steel expansion bolt. Coating SR base glue among the SR leveling layer, the anti-seepage adhesive tape and the geomembrane; and (5) coating an edge banding agent on the edge of the anti-seepage cover plate. For northern cold regions, countersunk bolts can also be used to replace stainless steel nuts.
And further, a second water-stopping anchoring part is arranged at the structural joint of the concrete connecting plate, the warehouse bottom concrete connecting plate or the drainage observation gallery for anchoring and sealing. For projects with working water depth less than 25m, only the bottom copper water stop sheet can be used for water stopping, and according to the foundation condition, a low-grade sand-free concrete cushion is laid according to the requirement to level the concrete foundation; a layer of chloroprene rubber gasket is laid on the surface of the base; the copper water stop sheet is adhered to the chloroprene rubber gasket; a closed-cell foam plate or an ethylene propylene diene monomer rubber plate is filled in the gap; for projects with working water depth larger than 25m and smaller than 100m, the concrete structure joint is provided with a second water stop at the top except for the copper water stop sheet at the bottom. And (3) chiseling the top concrete anchoring part, filling SR anti-seepage filler, covering an SR anti-seepage protective cover plate, fixing by adopting a stainless steel plate, and performing anchoring treatment by adopting a stainless steel expansion bolt. SR base glue is smeared among the cement mortar cushion layer, the chloroprene rubber gasket, the concrete anchoring part and the anti-seepage protective cover sheet; and (5) coating an edge banding agent on the edge of the anti-seepage cover plate. For northern cold regions, countersunk bolts can also be used to replace stainless steel nuts.
Furthermore, the upper protective layer can adopt concrete prefabricated blocks, mortar dry building blocks, sprayed concrete, sand bags and the like to press and cover the reservoir slope and reservoir bottom geomembranes, so that the geomembranes are prevented from being blown by strong wind and floating under the influence of water buoyancy in the operation period, ultraviolet irradiation is avoided, and the durability of the geomembranes is ensured.
Further, the lower support layer 6 is a support structure for geomembranes, and generally comprises two layers of an upper padding material and a lower padding material. The thickness of the upper cushion material is 10 cm-20 cm, medium-fine sand with the relative density more than or equal to 0.8 can be adopted for rolling and filling, and the maximum grain size is 2 cm. The thickness of the lower cushion layer is 40 cm-60 cm, the lower cushion layer can be filled by adopting broken stones with good gradation and stable internal structure or stable self-refluence filtration, the maximum grain diameter is 4 cm-8 cm, the content of grains smaller than 5mm is preferably 25% -50%, and the content of grains smaller than 0.075mm is preferably 4% -8%; has low compressibility and high shear strength after compaction, and the permeability coefficient is preferably i multiplied by 10-3～10-2cm/s; and has good construction characteristics; generally not less than 25t self-propelled vibratory roller compaction filling.
Based on the arrangement structure, the embodiment also provides a construction method of the PE geomembrane anti-seepage panel of the full-warehouse basin, which comprises the following steps:
s1, constructing a bank slope and a bank bottom, performing layered rolling and filling of a lower supporting layer on the bank slope or the bank bottom, and removing the oversize particles on the surface;
s2, casting a warehouse bottom concrete connecting plate or a concrete drainage observation corridor at the plane turning joint between the warehouse slope and the warehouse bottom, and constructing a second water-stopping anchoring piece at the concrete structure seam for anchoring and sealing treatment;
s3, casting a storehouse slope concrete connecting plate in the turning joint of the vertical face of the storehouse slope, and constructing a second water-stopping anchoring piece at the concrete structure joint for anchoring and sealing treatment;
s4, paving PE geomembrane anti-seepage panels on the warehouse slope and the warehouse bottom, and constructing a first water-stop anchoring piece at the joint of the PE geomembrane anti-seepage panels and the first concrete connecting structure and the second concrete connecting structure for anchoring and sealing;
and S5, paving the upper protective layer on the PE geomembrane anti-seepage panel at the bottom of the reservoir, and pressing and forming.
According to the description and the drawings of the utility model, the complete storehouse basin PE geomembrane anti-seepage panel arrangement structure can be easily manufactured or used by a person skilled in the art, and can generate the positive effects recorded by the utility model.
Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The utility model provides a full storehouse basin PE geomembrane prevention of seepage panel arrangement structure which characterized in that: the anti-seepage PE geomembrane comprises a reservoir slope and a reservoir bottom, wherein PE geomembrane anti-seepage panels with certain thicknesses are uniformly paved on the reservoir slope and the reservoir bottom; a first concrete connecting structure is circumferentially arranged at the plane turning joint between the warehouse slope and the warehouse bottom, and two side edges of the first concrete connecting structure are respectively in anchoring connection with the PE geomembrane anti-seepage panels paved on the warehouse slope and the warehouse bottom; and second concrete connecting structures are uniformly distributed at the joint of the turning of the vertical surface of the warehouse slope, and two side edges of each second concrete connecting structure are respectively connected with the PE geomembrane anti-seepage panels paved on the warehouse slope in an anchoring manner.
2. The PE geomembrane impermeable panel arrangement structure of the whole storehouse basin according to claim 1, wherein: and lower supporting layers are densely filled between the PE geomembrane seepage-proofing panel and the reservoir bottom and between the PE geomembrane seepage-proofing panel and the reservoir slope respectively.
3. The PE geomembrane impermeable panel arrangement structure of the whole storehouse basin according to claim 1, wherein: and an upper protective layer is pressed and covered on the PE geomembrane anti-seepage panel corresponding to the bottom of the reservoir.
4. The PE geomembrane impermeable panel arrangement structure of the whole storehouse basin according to claim 1, wherein: and a first water-stopping anchoring part is adopted between the first concrete connecting structure and the second concrete connecting structure and the PE geomembrane anti-seepage panel for anchoring and sealing treatment.
5. The PE geomembrane impermeable panel arrangement structure of the whole storehouse basin according to claim 1, wherein: and the structural joints of the first concrete connecting structure and the second concrete connecting structure are provided with second water stopping anchoring parts for anchoring and sealing treatment.
6. The PE geomembrane impermeable panel arrangement structure of the whole storehouse basin according to claim 1, wherein: the first concrete connecting structure is a warehouse bottom concrete connecting plate or a concrete drainage observation corridor.
7. The PE geomembrane impermeable panel arrangement structure of the whole storehouse basin according to claim 1, wherein: and the second concrete connecting structure is a storehouse slope concrete connecting plate.
8. The PE geomembrane impermeable panel arrangement structure of the whole storehouse basin according to claim 1, wherein: the PE geomembrane anti-seepage panel adopts a composite geomembrane with a two-cloth one-film structure, the specification of the upper and lower layers of geotextile is 10-20 kN/m, and the thickness of the geomembrane is 1-2 mm.
9. The PE geomembrane impermeable panel arrangement structure of the whole storehouse basin according to claim 3, wherein: a cushion layer is arranged between the upper protective layer and the PE geomembrane anti-seepage panel, and the cushion layer can be made of mortar, foamed plastic sheets or needle-punched geotextile.
10. The PE geomembrane impermeable panel arrangement structure of the whole storehouse basin according to claim 2, wherein: the lower supporting layer comprises two layers of an upper padding layer material and a lower padding layer material, wherein the upper padding layer material is rolled and filled by medium-fine sand with the thickness of 10-20 cm, and the lower padding layer material is filled by gravels with the thickness of 40-60 cm.
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| CN202023175117.3U CN215715041U (en) | 2020-12-25 | 2020-12-25 | Full storehouse basin PE geomembrane prevention of seepage panel arrangement structure |
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| CN202023175117.3U CN215715041U (en) | 2020-12-25 | 2020-12-25 | Full storehouse basin PE geomembrane prevention of seepage panel arrangement structure |
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