CN214783691U - Dam body core wall geomembrane and basic concrete structure's two flexible anchor structures of line of preventing and dam - Google Patents
Dam body core wall geomembrane and basic concrete structure's two flexible anchor structures of line of preventing and dam Download PDFInfo
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- CN214783691U CN214783691U CN202023167317.4U CN202023167317U CN214783691U CN 214783691 U CN214783691 U CN 214783691U CN 202023167317 U CN202023167317 U CN 202023167317U CN 214783691 U CN214783691 U CN 214783691U
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Abstract
The utility model relates to a dam body core wall geomembrane and basic concrete structure's two flexible anchor structures of line of preventing and dam. The utility model aims at a dam body core wall geomembrane and basic concrete structure's two flexible anchor structures of preventing line for on being fixed in the basic concrete of below with the internal geomembrane of dam. The technical scheme of the utility model is that: the top surface of the foundation concrete is provided with an anchoring groove, the anchoring groove is internally divided into a plastic deformation area which is positioned on the upstream side and is formed by filling plastic fillers, and an anchoring mechanism which is positioned on the downstream side, and the geomembrane penetrates through the plastic deformation area and is fixed on the downstream side in the plastic deformation area through the anchoring mechanism. The utility model is suitable for an adopt the geomembrane as the engineering of dam body middle part impervious core wall.
Description
Technical Field
The utility model relates to a dam body core wall geomembrane and basic concrete structure's two flexible anchor structures of line of preventing and dam. The method is suitable for engineering using the geomembrane as the impervious core wall in the middle of the dam body.
Background
The geomembrane is arranged in the middle of the dam body to form the geomembrane core wall rock-fill dam, so that ultraviolet rays can be effectively isolated, the service life of the geomembrane is prolonged, and external damages such as rock rolling, biology and the like during the operation of the geomembrane can be avoided. Research results have shown that the geomembrane core wall generates a large tensile stress during the operation of the site where the bottom is anchored to the concrete structure, thereby causing the joint to be broken. The main reason is that after water storage, the seepage-proofing body moves downstream under the thrust action of water load, dislocation displacement is generated at an anchoring part, and the geomembrane is influenced by the clamp effect to locally generate larger tensile deformation, thereby leading to the condition of concentrated tensile stress. Local tensile stress concentrations can cause problems with geomembrane tear failure or anchor failure.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: aiming at the existing problems, the double-defense-line flexible anchoring structure of the dam core wall geomembrane and the foundation concrete structure and the dam with reliable seepage-proofing effect and capable of effectively releasing deformation are provided, so that the safe and stable operation of the geomembrane core wall rock-fill dam under various unfavorable working conditions and conditions such as high water head, weak dam filling materials and the like is ensured.
The utility model adopts the technical proposal that: the utility model provides a dam body core wall geomembrane and basic concrete structure's two flexible anchor structures of line of defence for on being fixed in the basic concrete of below with the geomembrane in the dam body, its characterized in that: the top surface of the foundation concrete is provided with an anchoring groove, the anchoring groove is internally divided into a plastic deformation area which is positioned on the upstream side and is formed by filling plastic fillers, and an anchoring mechanism which is positioned on the downstream side, and the geomembrane penetrates through the plastic deformation area and is fixed on the downstream side in the plastic deformation area through the anchoring mechanism.
The anchoring mechanism comprises base glue, plastic filler, a rubber cover plate and plastic filler which are sequentially arranged on the bottom surface of the anchoring groove, the core wall geomembrane is laid on the plastic filler, and the rubber cover plate is laid on the core wall geomembrane and is compressed tightly through an angle steel matched bolt and a nut.
And secondary concrete which is pressed on the anchoring mechanism is poured in the anchoring groove.
The second-stage concrete is connected with the foundation concrete through anchor bars.
And geotextile and fine sand layers are sequentially laid on the surfaces of the secondary concrete and the plastic deformation area.
The plastic deformation zone comprises base glue and plastic fillers which are sequentially arranged on the bottom surface and the upstream side wall of the anchoring groove, a semicircular plastic filler bulge is formed on the plastic filler at a position close to the anchoring mechanism, the geomembrane is attached to the surface of the plastic filler, and the plastic filler is filled at the upper part of the geomembrane.
And the downstream side of the plastic filler filled in the upper part of the geomembrane in the plastic deformation area is kept upright, and the bottom of the plastic filler is arc-shaped.
The cross section of the anchoring groove is in a trapezoid shape with a large upper part and a small lower part, and corners of the top of the upstream side are circular arcs or elliptical arcs.
A dam, characterized by: the double-line-prevention flexible anchoring structure comprises foundation concrete, a dam body internally provided with a geomembrane and a double-line-prevention flexible anchoring structure of the geomembrane of the core wall of the dam body and the foundation concrete structure.
A construction method of the double-defense-line flexible anchoring structure of the dam core wall geomembrane and the foundation concrete structure is characterized by comprising the following steps:
constructing foundation concrete, reserving an anchoring groove, and presetting anchor bars on the side wall of the downstream in the groove;
cleaning and drying the anchoring groove, then coating base glue along the downstream side of the bottom surface of the anchoring groove, laying plastic filler, a rubber cover plate, the plastic filler, the geomembrane and the rubber cover plate in sequence, and pressing and covering angle steel on the rubber cover plate and matching with a bolt and a nut to realize compaction to form an anchoring mechanism;
cleaning the part of the upstream side in the anchoring groove, drying, coating base glue on the bottom and the side wall of the upstream side of the anchoring groove, paving a plastic filler, forming a semicircular plastic filler bulge on the plastic filler at the part close to the anchoring mechanism, and pasting the geomembrane along the surface of the plastic filler;
plastic fillers are filled at the upper part of the geomembrane at the part on the inner upstream side of the anchoring groove, the downstream side of the plastic fillers is kept upright, and the bottom of the plastic fillers is arc-shaped;
after plastic fillers on the upstream side of the anchoring groove are filled, a cavity is formed on the downstream side, and secondary concrete is poured in the cavity to cover the anchoring mechanism;
and plastic fillers filled at the upstream side of the anchoring groove and a layer of geotextile and a fine sand layer are sequentially paved on the surface of secondary concrete poured at the downstream side, and the upper part of the anchoring groove is designed to fill a dam body according to the cross section of the dam.
The utility model has the advantages that: the utility model discloses utilize the plastic packing to form a plastic deformation district between anchor mechanism and dam body rock-fill, because the plastic deformation district is in the upper reaches side of anchor structure, when downstream displacement appears in the geomembrane core wall behind the dam retaining, the production that geomembrane tensile stress can effectively be eliminated in the deformation in geomembrane downstream plastic deformation district, improves the operation safety of geomembrane core wall.
The utility model discloses a pour second stage concrete on anchoring mechanism upper portion, and reserve semi-circular plasticity filler swell at anchoring mechanism upper reaches, make when anchoring mechanism edge takes place big deformation under the most unfavorable condition, the deformation direction of geomembrane is vertical upwards to be out of shape by traditional anchoring structure's horizontal deformation adjustment, because the gravity resistance of dam body is greater than horizontal resistance far away, make the deformation at mechanical anchoring position can obtain effective control, utilize simultaneously to reserve the swell and provide sufficient deformation space, effectively reduce traditional anchoring structure's "anchor effect".
Drawings
Fig. 1 is an overall structure view of the dam of the embodiment.
Fig. 2 is a schematic structural view of an anchor groove portion of the embodiment.
1. A dam foundation; 2. a base concrete; 3. a geomembrane; 4. a dam body; 5-1, bolts; 5-2, angle steel; 5-3, a nut; 5-4, plastic filler; 5-5, a rubber cover plate; 5-6, second-stage concrete; 5-7, geotextile; 5-8, fine sand layer; 5-9 and anchor bars.
Detailed Description
The embodiment is a double-defense line flexible anchoring structure of a dam body core wall geomembrane and a foundation concrete structure, and is used for fixing the geomembrane in a dam body on the foundation concrete below.
In the embodiment, an anchoring groove is arranged on the top surface of the foundation concrete, the anchoring groove is divided into an upstream area and a downstream area, a plastic deformation area is arranged in the upstream area of the anchoring groove, an anchoring mechanism is arranged in the downstream area of the anchoring groove, and the geomembrane in the dam body is fixed in the anchoring groove through the anchoring mechanism after penetrating through the plastic deformation area.
In order to reduce the influence of the anchoring groove on the overall performance of the foundation concrete structure, the anchoring groove is arranged at a part with relatively thicker thickness of the foundation concrete structure. The anchor groove is big end down's trapezoidal section, and wherein the top corner of upstream side adopts circular arc or elliptical arc, avoids appearing the closed angle.
The anchoring mechanism in this embodiment has angle steel (or band steel), bolt and nut etc. 1 ~ 2 primer, one deck plastic filler, one deck rubber cover piece, one deck plastic filler, the geomembrane and the one deck rubber cover piece that extend in the dam body that lay in proper order on the regional bottom surface of downstream side in anchor groove, the angle steel is pressed on the rubber cover piece, and the angle steel is fixed in the anchor groove bottom surface through bolt and nut, compresses tightly through the angle steel and makes rubber cover piece and the plastic filler etc. between geomembrane and the basic concrete be in the compression state.
In the embodiment, the plastic deformation area comprises 1-2 channels of base glue coated on the bottom surface and the upstream side wall of the upstream area of the anchoring groove, a layer of plastic filler is laid, a semicircular plastic filler bulge is formed at the position close to the bolt anchoring part, and a geomembrane extending out of the dam body is attached along the surface of the plastic filler. And filling plastic fillers at the upper part of the geomembrane in the upstream area of the anchoring groove, wherein the downstream side of the filled plastic fillers is kept upright, the bottom of the filled plastic fillers is arc-shaped, and the closest distance between the filled plastic fillers and the anchoring mechanism is controlled to be 5-10 cm.
In the embodiment, the base glue and the plastic filler in the upstream area of the anchoring groove are connected with the base glue and the plastic filler in the downstream area of the anchoring groove, and no white part is left in the middle.
In this embodiment, after the plastic filler is filled in the upstream region of the anchoring groove, a cavity is formed above the anchoring mechanism in the downstream region of the anchoring groove, and secondary concrete is poured in the cavity to cover the anchoring mechanism. In order to enhance the connection strength between the second-stage concrete and the extruded concrete, anchor bars are preset at the downstream side wall positions of the anchor grooves during pouring of the foundation concrete, and the anchor bars can be connected with the second-stage concrete and the foundation concrete.
In this embodiment, a layer of geotextile and a fine sand layer are sequentially laid on the top surface of the foundation concrete corresponding to the anchoring groove, and the upper part of the foundation concrete is designed to fill the dam body according to the cross section of the dam, wherein the geotextile and the fine sand layer cover the plastic filler in the upstream area of the anchoring groove and the second-stage concrete surface in the downstream area. The geotextile and the fine sand layer mainly play a role in protection, and prevent the plastic filler from being extruded and damaged by the rolling of coarse-grained soil of the dam body and from being lost under the water pressure during the permanent operation.
In this embodiment, a double-defense line flexible anchoring structure of a dam core wall geomembrane and a foundation concrete structure includes the following specific implementation steps:
constructing foundation concrete on a dam foundation, reserving an anchoring groove on the top surface, reserving cast-in-place anchor bars on the downstream side wall in the groove, and reserving cast-in-place bolts according to design lines and intervals when bolts in an anchoring mechanism are anchored in a cast-in-place mode;
cleaning sundries in the groove, and treating defects of damage to the geomembrane caused by pits, sharp corners and the like in the groove and uneven parts of the anchoring structure along the line, which influence the anti-seepage effect of the anchoring structure; when the bolts in the anchoring mechanism are anchored by using the anchoring agent after drilling, the bolts are buried by drilling according to the design line and the interval;
cleaning and drying the anchoring groove, coating 1-2 layers of base glue along the downstream area of the anchoring groove, sequentially laying a layer of plastic filler, a layer of rubber cover plate, a layer of plastic filler, a geomembrane extending out of the dam body, a layer of rubber cover plate, pressing and covering angle steel, and mounting nuts for fastening;
cleaning and drying the upstream part of the anchoring groove, coating 1-2 layers of base glue on the bottom and the upstream side wall of the upstream area of the anchoring groove, laying a layer of plastic filler, forming a semicircular plastic filler bulge at the part close to the bolt anchoring part, and adhering a geomembrane extending out of the dam body along the surface of the plastic filler;
plastic fillers are filled in the upstream area of the anchoring groove and the upper part of the geomembrane, the downstream side of the filled plastic fillers keeps upright, the bottom of the filled plastic fillers is arc-shaped, and the closest distance between a filling area and the anchoring mechanism is controlled to be 5-10 cm;
after plastic fillers are filled in the upstream area of the anchoring groove, a cavity is formed above the anchoring mechanism in the downstream area of the anchoring groove, and secondary concrete is poured in the cavity to cover the anchoring mechanism;
and plastic fillers filled in an upstream area in the anchoring groove and a layer of geotextile and a fine sand layer are sequentially paved on the surface of the second-stage concrete in a downstream area, and a dam body is filled on the upper part according to the design of the dam section.
Claims (9)
1. The utility model provides a dam body core wall geomembrane and basic concrete structure's two flexible anchor structures of line of defence for on being fixed in the basic concrete of below with the geomembrane in the dam body, its characterized in that: the top surface of the foundation concrete is provided with an anchoring groove, the anchoring groove is internally divided into a plastic deformation area which is positioned on the upstream side and is formed by filling plastic fillers, and an anchoring mechanism which is positioned on the downstream side, and the geomembrane penetrates through the plastic deformation area and is fixed on the downstream side in the plastic deformation area through the anchoring mechanism.
2. The double-line-protection flexible anchoring structure for the geomembrane and the foundation concrete structure of the dam body core wall according to claim 1, wherein: the anchoring mechanism comprises base glue, plastic filler, a rubber cover plate and plastic filler which are sequentially arranged on the bottom surface of the anchoring groove, the core wall geomembrane is laid on the plastic filler, and the rubber cover plate is laid on the core wall geomembrane and is compressed tightly through an angle steel matched bolt and a nut.
3. The double-line-defense flexible anchoring structure of the dam body core wall geomembrane and the foundation concrete structure according to claim 1 or 2, characterized in that: and secondary concrete which is pressed on the anchoring mechanism is poured in the anchoring groove.
4. The double-line-defense flexible anchoring structure of the dam body core wall geomembrane and the foundation concrete structure according to claim 3, characterized in that: the second-stage concrete is connected with the foundation concrete through anchor bars.
5. The double-line-defense flexible anchoring structure of the dam body core wall geomembrane and the foundation concrete structure according to claim 3, characterized in that: and geotextile and fine sand layers are sequentially laid on the surfaces of the secondary concrete and the plastic deformation area.
6. The double-line-protection flexible anchoring structure for the geomembrane and the foundation concrete structure of the dam body core wall according to claim 1, wherein: the plastic deformation zone comprises base glue and plastic fillers which are sequentially arranged on the bottom surface and the upstream side wall of the anchoring groove, a semicircular plastic filler bulge is formed on the plastic filler at a position close to the anchoring mechanism, the geomembrane is attached to the surface of the plastic filler, and the plastic filler is filled at the upper part of the geomembrane.
7. The double-line-defense flexible anchoring structure of the dam body core wall geomembrane and the foundation concrete structure according to claim 6, wherein: and the downstream side of the plastic filler filled in the upper part of the geomembrane in the plastic deformation area is kept upright, and the bottom of the plastic filler is arc-shaped.
8. The double-line-protection flexible anchoring structure for the geomembrane and the foundation concrete structure of the dam body core wall according to claim 1, wherein: the cross section of the anchoring groove is in a trapezoid shape with a large upper part and a small lower part, and corners of the top of the upstream side are circular arcs or elliptical arcs.
9. A dam, characterized by: the dam body with foundation concrete and the geomembrane arranged inside and the double-waterproof-line flexible anchoring structure of the geomembrane of the dam body core wall and the foundation concrete structure of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023167317.4U CN214783691U (en) | 2020-12-24 | 2020-12-24 | Dam body core wall geomembrane and basic concrete structure's two flexible anchor structures of line of preventing and dam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023167317.4U CN214783691U (en) | 2020-12-24 | 2020-12-24 | Dam body core wall geomembrane and basic concrete structure's two flexible anchor structures of line of preventing and dam |
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| Publication Number | Publication Date |
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| CN214783691U true CN214783691U (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023167317.4U Active CN214783691U (en) | 2020-12-24 | 2020-12-24 | Dam body core wall geomembrane and basic concrete structure's two flexible anchor structures of line of preventing and dam |
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| CN (1) | CN214783691U (en) |
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