Cofferdam anti-seepage composite geomembrane telescopic structure

Abstract

The invention relates to the technical field of cofferdam anti-seepage, in particular to a cofferdam anti-seepage composite geomembrane telescopic structure which comprises cofferdam units and telescopic adjusting units. Each cofferdam unit comprises a slope surface arranged on one side of the cofferdam body and concrete panels sequentially arranged at the upper end of the slope surface; the telescopic adjusting unit comprises a cross beam and a longitudinal beam, and the longitudinal beam is connected to the interior of the cross beam in a sliding mode. The edge of the geomembrane body is fixed through the toe board, when the adjacent concrete panels have extrusion force due to heat expansion and cold contraction of the concrete panels, thermal expansion deformation of the concrete panels is hindered through the cross beams and the longitudinal beams, and meanwhile, when thermal expansion is finished and cold contraction occurs, the longitudinal beams move and reset along the cross beams, so that the deformation of the concrete panels is prevented. And the concrete panel which finishes thermal expansion and starts to shrink automatically recovers to the initial position, and the situation that the geomembrane body is cracked and damaged due to the fact that thermal expansion and cold contraction deformation is too large is avoided.

Description

Technical Field

[0001] This invention relates to the field of cofferdam seepage prevention technology, specifically to a cofferdam seepage prevention composite geomembrane expansion structure. Background Technology

[0002] In the field of hydropower station construction, upstream earth-rock cofferdams are characterized by their long length, high height, and large volume, as well as complex geological conditions and deep overburden layers at the foundation. To facilitate on-site construction, the cofferdam panels are often made of multiple precast concrete panels installed sequentially on the slope. However, concrete is subject to thermal expansion and contraction. To prevent adjacent precast concrete panels from being squeezed due to thermal expansion and contraction at different temperatures, a certain gap is usually required between adjacent panels. Existing technologies typically fill the joints with asphalt-impregnated wood boards, polyurethane elastic adhesive, or simple corrugated folds, but these methods have three drawbacks: First, the elastic materials have a short aging cycle, hardening and cracking within 2-3 years, losing their displacement compensation ability; second, the folded sections are prone to fatigue fracture under ultraviolet radiation and ice expansion, still transferring tensile stress to the membrane; third, there is no active reset mechanism during the panel's cold shrinkage stage, relying solely on its own weight or dam slope friction for rebound, with a reset rate of less than 50%, and long-term cumulative deformation depletes the folding allowance. Therefore, there is an urgent need for a mechanical expansion and contraction structure that can move synchronously with the thermal expansion and contraction of the panel, provide reliable rebound force during the cooling phase, automatically reset, and always protect the geomembrane from tearing, so as to solve the risk of thermal fatigue damage and leakage at one time and extend the entire life cycle of the cofferdam seepage prevention system. Summary of the Invention

[0003] The purpose of this invention is to provide a cofferdam seepage prevention composite geomembrane expansion structure to solve the problem mentioned in the background art that the concrete panels of the cofferdam have thermal expansion, causing irregular deformation of adjacent concrete panels, resulting in the tearing and damage of the seepage prevention geomembrane laid on the upper part of the adjacent concrete panels.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A cofferdam seepage prevention composite geomembrane expansion structure includes: A cofferdam unit includes a slope on one side of the cofferdam body, and concrete panels arranged sequentially on the upper part of the slope. The telescopic adjustment unit includes a crossbeam for lateral support and limiting of the bottom of the concrete panel and a longitudinal beam for longitudinal support and limiting of the bottom of the concrete panel. The longitudinal beam is slidably connected inside the crossbeam and is used to adjust the expansion and contraction of adjacent concrete panels after thermal expansion and contraction.

[0005] Furthermore, the cofferdam unit also includes: The geomembrane body is laid on the top of the concrete panel and is used to prevent seepage of the cofferdam body. A toe plate is disposed on the periphery of the area formed by the multiple concrete panels to fix the edge of the geomembrane body, and the toe plate is fixedly connected to the slope.

[0006] Furthermore, the lower end of the concrete panel is provided with a second slot corresponding to the longitudinal beam, which is used to cooperate with the longitudinal beam to limit the position of the concrete panel. The lower end of the concrete panel is provided with a first slot corresponding to the crossbeam, which is used to cooperate with the crossbeam to limit the spacing between adjacent concrete panels.

[0007] Furthermore, the crossbeam is fixedly connected to the slope surface; The crossbeam is located outside the longitudinal beam and is provided with a recess groove; Both ends of the longitudinal beam are located inside the recess groove and are fixedly connected to guide shafts for limiting the longitudinal beam; The guide shaft is located at one end of the longitudinal beam and is fixedly connected inside the cross beam with a limiting block for limiting the guide shaft.

[0008] Furthermore, the crossbeam has a guide groove on the outside of the limiting block for guiding the movement of the limiting block. The guide groove is equipped with a retraction spring for extending and retracting the limiting block.

[0009] Furthermore, the width of the recessed groove is greater than the width of the longitudinal beam, which is used to provide the longitudinal beam with a telescoping distance when the concrete panel expands and contracts with temperature.

[0010] Furthermore, the geomembrane body is provided with expansion joints that correspond one-to-one with the gaps of adjacent concrete panels, which are used to compensate for the length of the geomembrane body stretched by the thermal expansion and contraction of the concrete panels.

[0011] Compared with the prior art, the beneficial effects of the present invention are: This invention involves installing crossbeams and longitudinal beams on a slope, then sequentially placing concrete panels over the outside of the crossbeams and longitudinal beams. Finally, the geomembrane body is laid on the surface formed by the upper ends of multiple concrete panels, and the edges of the geomembrane body are secured by toe plates. When the concrete panels experience thermal expansion and contraction due to heat, causing compressive stress between adjacent concrete panels, the crossbeams and longitudinal beams hinder the thermal expansion deformation of the concrete panels. Simultaneously, when thermal expansion ends and contraction occurs, the longitudinal beams move and reset along the crossbeams, allowing the concrete panels that have finished thermal expansion and begun to contract to automatically return to their initial positions, preventing the geomembrane body from being torn and damaged due to excessive thermal expansion deformation. Attached Figure Description

[0012] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This diagram illustrates the fit between the concrete panel and the geomembrane body of the present invention. Figure 3 This is a schematic diagram showing the distribution of the concrete panel of the present invention; Figure 4 This is a schematic diagram of the telescopic adjustment unit of the present invention; Figure 5 This is a diagram showing the fit between the crossbeam and the longitudinal beam of this invention; Figure 6 For the present invention in Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the structure at the bottom of the concrete panel of the present invention; Figure 8 This is a cross-sectional view of the geomembrane body of the present invention.

[0013] Reference numerals in the attached drawings: 1. Cofferdam unit; 11. Slope; 12. Cofferdam body; 13. Geomembrane body; 131. Expansion joint; 14. Concrete panel; 141. First slot; 142. Second slot; 15. Toe plate; 2. Expansion adjustment unit; 21. Crossbeam; 211. Retraction slot; 212. Guide slot; 22. Longitudinal beam; 221. Guide shaft; 222. Limiting block; 223. Retraction spring. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Please see Figure 1-8 The present invention provides a technical solution: A cofferdam seepage prevention composite geomembrane expansion structure includes: The cofferdam unit 1 includes a slope 11 located on one side of the cofferdam body 12, and concrete panels 14 arranged sequentially on the upper end of the slope 11. The telescopic adjustment unit 2 includes a crossbeam 21 for lateral support and limiting of the bottom of the concrete panel 14 and a longitudinal beam 22 for longitudinal support and limiting of the bottom of the concrete panel 14. The longitudinal beam 22 is slidably connected inside the crossbeam 21 and is used to adjust the expansion and contraction of adjacent concrete panels 14 after thermal expansion and contraction.

[0016] It should be noted that: by installing the crossbeam 21 and longitudinal beam 22 on the slope 11, and then successively placing the concrete panels 14 on the outside of the crossbeam 21 and longitudinal beam 22, and finally laying the geomembrane body 13 on the surface formed by the upper ends of the multiple concrete panels 14, and fastening the edges of the geomembrane body 13 by the toe plate 15, when the concrete panels 14 are subjected to thermal expansion and contraction, causing extrusion pressure on adjacent concrete panels 14, the crossbeam 21 and longitudinal beam 22 hinder the thermal expansion deformation of the concrete panels 14. At the same time, when the thermal expansion ends and contraction occurs, the longitudinal beam 22 moves and resets along the crossbeam 21, so that the concrete panels 14 that have finished thermal expansion and have begun to contract automatically return to their initial position, avoiding the geomembrane body 13 from being torn and damaged due to excessive thermal expansion deformation.

[0017] As an improvement, such as Figure 1-2 As shown, the cofferdam unit 1 further includes: The geomembrane body 13 is laid on the upper end of the concrete panel 14 and is used to prevent seepage of the cofferdam body 12. A toe plate 15 is disposed on the periphery of the area formed by the plurality of concrete panels 14, and is used to fix the edge of the geomembrane body 13. The toe plate 15 is fixedly connected to the slope 11.

[0018] Furthermore, such as Figure 7 As shown, the lower end of the concrete panel 14 is provided with a second slot 142 corresponding to the longitudinal beam 22, which is used to cooperate with the longitudinal beam 22 to limit the concrete panel 14. The lower end of the concrete panel 14 is provided with a first slot 141 corresponding to the crossbeam 21, which is used to cooperate with the crossbeam 21 to limit the spacing between adjacent concrete panels 14.

[0019] Furthermore, such as Figure 3-6 As shown, the crossbeam 21 is fixedly connected to the slope 11; The crossbeam 21 is located inside the longitudinal beam 22 and outside the longitudinal beam 22 and is provided with a recess groove 211; Guide shafts 221 are fixedly connected to both ends of the longitudinal beam 22 inside the retraction groove 211 to limit the longitudinal beam 22; The guide shaft 221 is located at one end of the longitudinal beam 22 and is fixedly connected inside the cross beam 21 with a limiting block 222 for limiting the guide shaft 221.

[0020] The crossbeam 21 has a guide groove 212 inside on the outside of the limiting block 222 for guiding the movement of the limiting block 222; The guide groove 212 is provided with a retraction spring 223 for extending and retracting the limiting block 222.

[0021] In addition, such as Figure 6 As shown, the width of the recess groove 211 is greater than the width of the longitudinal beam 22, and it is used to provide the longitudinal beam 22 with a telescoping distance when the concrete panel 14 expands and contracts with heat.

[0022] As an improvement, the geomembrane body 13 is provided with expansion joints 131 inside, which correspond one-to-one with the gaps of adjacent concrete panels 14, to compensate for the length of the geomembrane body 13 stretched by the thermal expansion and contraction of the concrete panels 14.

[0023] It should be added that adjacent longitudinal beams 22 are set at equal intervals within the transverse beams 21.

[0024] It should be noted that: in the specific implementation process of this invention, such as Figure 1-4 As shown, the crossbeam 21 and the longitudinal beam 22 are first installed on the slope 11, and then the concrete panel 14 is successively placed on the outside of the crossbeam 21 and the longitudinal beam 22, so that the second slot 142 is locked on the outside of the longitudinal beam 22 and the first slot 141 is locked on the outside of the crossbeam 21. By setting the longitudinal beam 22 at equal intervals inside the crossbeam 21, the adjacent concrete panels 14 can maintain equal spacing after installation, thereby improving the installation accuracy of the concrete panel 14. like Figure 4-5 , Figure 7 As shown, the geomembrane body 13 is then laid on the upper end of multiple adjacent concrete panels 14, and the edges of the geomembrane body 13 are fixed by the toe plate 15. When the concrete panels 14 are subjected to thermal expansion and contraction, on the one hand, the concrete panels 14 are limited by the cooperation of the longitudinal beam 22 and the second slot 142, and the concrete panels 14 are limited by the cooperation of the transverse beam 21 and the first slot 141. This ensures that the adjacent concrete panels 14 can remain in a limited position after thermal expansion and contraction, and avoids the adjacent concrete panels 14 from shifting a large distance due to thermal expansion and contraction, which would cause the geomembrane body 13 to be torn and damaged by the concrete panels 14. like Figure 5-6 As shown, after the temperature drops and the thermal expansion and contraction subsides, the retraction spring 223, which was originally compressed by the longitudinal beam 22 and the guide shaft 221 due to the thermal expansion and contraction of the concrete panel 14, pushes the limiting block 222 to drive the guide shaft 221 to reset after being no longer compressed. The guide shaft 221 drives the longitudinal beam 22 to move along the inside of the retraction groove 211 to the middle position of the retraction groove 211. The longitudinal beam 22 drives the concrete panel 14 to move and reset, so that the geomembrane body 13 is released from the tension of the concrete panel 14, further preventing the geomembrane body 13 from being torn and damaged.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cofferdam impervious composite geomembrane expansion joint, characterized by, The application relates to a cofferdam anti-seepage composite geomembrane expansion structure. The cofferdam unit (1) comprises a slope (11) arranged on one side of a cofferdam body (12) and concrete panels (14) arranged on the slope (11) in sequence.

2. The cofferdam anti-seepage composite geomembrane expansion structure according to claim 1, wherein the cofferdam unit (1) further comprises: The geomembrane body (13) is arranged on the upper end of the concrete panel (14) and is used for anti-seepage work of the cofferdam body (12). The toe plate (15) is arranged on the periphery of the area formed by the concrete panels (14) and is used for fixing the edge of the geomembrane body (13).

3. The cofferdam anti-seepage composite geomembrane expansion structure according to claim 1, wherein the lower end of the concrete panel (14) is provided with a second clamping groove (142) corresponding to the longitudinal beam (22) and is used for limiting the concrete panel (14) in cooperation with the longitudinal beam (22).

4. The cofferdam anti-seepage composite geomembrane expansion structure according to claim 1, wherein the transverse beam (21) is fixedly connected with the slope (11). The transverse beam (21) is located outside the longitudinal beam (22) and is provided with a retreat groove (211). The two ends of the longitudinal beam (22) are located inside the retreat groove (211) and are fixedly connected with guide shafts (221) used for limiting the longitudinal beam (22). The guide shaft (221) is located at one end of the longitudinal beam (22) and is fixedly connected with a limiting block (222) used for limiting the guide shaft (221) inside the transverse beam (21).

5. The cofferdam anti-seepage composite geomembrane expansion structure according to claim 4, wherein the transverse beam (21) is provided with a guide groove (212) used for guiding the movement of the limiting block (222) outside the limiting block (222). The guide groove (212) is provided with a retreat spring (223) used for expansion and contraction of the limiting block (222).

6. The cofferdam anti-seepage composite geomembrane expansion structure according to claim 4, wherein the width of the retreat groove (211) is greater than the width of the longitudinal beam (22) and is used for providing the longitudinal beam (22) with an expansion distance when the concrete panel (14) expands and contracts due to temperature change.

7. The cofferdam anti-seepage composite geomembrane expansion structure according to claim 2, wherein ​ ​ ​ ​ ​ ​ ​ The geomembrane body (13) is internally provided with expansion joints (131) corresponding to the gaps between the adjacent concrete panels (14), for supplementing the length of the geomembrane body (13) stretched by the thermal expansion and contraction of the concrete panels (14).

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