Structural form of drainage hole of permeable bottom plate of stilling pool and construction method of structural form

Abstract

The invention discloses a structural form of a drainage hole of a permeable bottom plate of a stilling pool and a construction method of the structural form. The construction method comprises the steps that 1, a designed excavation elevation is excavated on a building foundation, and a water collecting pit is arranged; 2, the drainage floral tube is placed in the water collection pit; 3, putting the inverted filter assembly into the drainage floral tube; 4, connecting a trapezoidal drainage pipe to the upper end of the drainage floral pipe; 5, stilling pool bottom plate concrete and anti-impact and wear-resistant concrete are poured respectively; 6, the trapezoidal drainage pipe is filled with stones; and 7, pouring non-fine concrete into the trapezoidal drainage pipe to cover the trapezoidal drainage pipe to the elevation of the overflowing surface. According to the structural form of the drainage hole of the permeable bottom plate of the stilling pool, the anti-floating stability problem of the bottom plate of the stilling pool is solved, meanwhile, the dangerous situations that a foundation of the bottom plate of the stilling pool is subjected to seepage failure, the bottom plate is upheaved and cracked and the like are not prone to being caused, and the engineering safety is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy and hydropower engineering, relates to the structural type of drainage holes of a water-permeable bottom plate of a stilling pool, and also relates to a construction method of the structural type of drainage holes of a water-permeable bottom plate of a stilling pool. Background Art

[0002] In water conservancy and hydropower projects, the bottom plate of the energy stilling pool is very likely to overturn, bulge and crack under the action of seepage pressure, resulting in a high rate of failure of the downstream energy stilling pool. In order to allow the water below the bottom plate of the energy stilling pool to be discharged smoothly, reduce the seepage pressure of the energy stilling pool, and ensure the safety and normal operation of the energy stilling pool and the dam, it is necessary to make the bottom plate of the energy stilling pool a permeable bottom plate or arrange a dark drainage system at the bottom of the bottom plate.

[0003] However, the hidden drainage system under the bottom plate often has the disadvantages of complex construction, easy blockage, and inconvenient maintenance. The permeable bottom plate is relatively more widely used, that is, the open drainage scheme, which uses drainage holes to directly discharge the underground pressurized water into the energy dissipation pool. It does not require pumping and pressure reduction, and the operation method is simple. Most open drainage schemes use drainage holes of equal diameter, but when discharging flood water, under the action of dynamic water and seepage pressure, the bottom plate of the energy dissipation pool is prone to seepage damage, bottom plate bulging and cracking, and other dangerous situations. The drainage holes are easily blocked by silt, and the anti-filtration device in the drainage hole is easily washed away, accelerating the occurrence of seepage damage to the bottom plate.

[0004] Therefore, a structural type of drainage holes of the permeable bottom plate of the energy dissipation pool is needed, which can effectively prevent scouring and blockage while solving the problem of anti-floating stability of the bottom plate of the energy dissipation pool and ensuring the safety of the project, and has the characteristics of simple construction process, fast construction speed, convenient operation and maintenance, and economic applicability. Summary of the invention

[0005] The purpose of the present invention is to provide a structural type of drainage holes in a permeable bottom plate of an energy dissipation pool, which is more convenient to maintain and simple to construct. While solving the anti-floating stability problem of the bottom plate of the energy dissipation pool, it is not easy to cause penetration damage to the foundation of the bottom plate of the energy dissipation pool and bulge, crack and other dangerous situations of the bottom plate, thereby improving the safety of the project.

[0006] Another object of the present invention is to provide a method for constructing the drainage hole structure of the permeable bottom plate of the energy dissipation pool.

[0007] The first technical solution adopted by the present invention is that the structural type of the drainage holes of the permeable bottom plate of the energy dissipation pool is that "trapezoidal" drainage holes are arranged on the bottom plate of the energy dissipation pool. The structural type of the "trapezoidal" drainage holes is bottom drainage and backfiltration, the middle part is permeable gravel, and the top is a cast-in-place truncated cone-shaped permeable concrete cover.

[0008] The second technical solution adopted by the present invention is a method for constructing a drainage hole structure of a permeable bottom plate of an energy dissipation pool, and the specific method is as follows: Step 1: Excavate the building foundation, dig out the designed excavation elevation, and lay out the sump based on the designed excavation elevation; Step 2: Place the drainage flower pipe into the sump; Step 3: Place the filter assembly into the drainage pipe and place it higher than the designed excavation elevation; Step 4: Connect the trapezoidal drainage pipe to the upper end of the drainage flower pipe; Step 5: Use the trapezoidal drainage pipe and the drainage flower pipe as templates to pour the energy dissipation pool bottom slab concrete and the impact-resistant and wear-resistant concrete respectively; Step 6: Fill the trapezoidal drain pipe with stones; Step 7: Pour sandless concrete cover into the trapezoidal drain pipe to the level of the flow surface.

[0009] The present invention is also characterized in that: The depth of the sump in step 2 is 50cm~100cm.

[0010] In step 3, the anti-filtration component is specifically obtained by wrapping coarse sand with non-woven filter cloth and fixing it with nylon rope. The height of the anti-filtration component is 20cm~30cm higher than the designed excavation elevation.

[0011] In step 4, the longitudinal section of the drainage pipe is a trapezoidal structure, and the end with a larger diameter of the drainage pipe is fixedly connected to the upper end of the drainage flower pipe through the steel mesh of the bottom plate of the energy dissipation pool; The upper and lower diameters of the drainage flower pipe are consistent.

[0012] In step 5, the lower layer is poured with energy dissipation pool bottom slab concrete, and the upper layer is poured with impact-resistant and wear-resistant concrete.

[0013] In step 6, the particle size of the gravel is 1 cm, the bottom of the laid gravel is located 20 to 30 cm above the bottom surface of the concrete of the energy dissipation pool bottom slab, and the top of the laid gravel is located 15 to 20 cm below the flow surface.

[0014] In step 7, the sandless concrete cover is a truncated cone structure with a larger bottom and a smaller top, and the thickness of the sandless concrete cover is 15 to 20 cm.

[0015] The beneficial effects of the present invention are: (1) The structural type of the drainage hole of the permeable bottom plate of the energy dissipation pool of the present invention is a trapezoidal sandless concrete cover on the upper part, which adopts a "large at the bottom and small at the top" truncated cone structure. It is not easy to be washed out of the drainage hole under the action of high-speed water flow and pulsating pressure, thereby protecting the coarse sand and gravel at the bottom of the drainage pipe, and playing a role in preventing the drainage hole from being eroded and damaged; (2) The structural type of the drainage hole of the permeable bottom plate of the energy dissipation pool of the present invention is that the coarse sand is wrapped with a non-woven filter cloth and fixed with a nylon rope, and then penetrates into the 50 cm deep water collection pit at the bottom, which can effectively prevent the clogging of the drainage hole while filtering. The coarse sand is wrapped with a non-woven filter cloth and fixed with a nylon rope before being put into the plastic flower pipe, and there is no need to close the top of the pipe later, so the process is simple and the construction is convenient; (3) The structural type of the drainage hole of the permeable bottom plate of the energy dissipation pool of the present invention, the drainage flower pipe is connected to the trapezoidal drainage pipe, and is arranged according to the layout of the drainage holes. It is fixed with the help of the steel mesh of the bottom plate of the energy dissipation pool, and can also serve as a template to prevent concrete from entering the drainage pipe during pouring. The construction is simple and can be prefabricated in advance without affecting the construction period; (4) The structural type of the drainage holes of the permeable bottom plate of the energy dissipation pool of the present invention is to arrange trapezoidal combined drainage holes on the bottom plate of the energy dissipation pool, and to have a built-in combination of "bottom drainage filter + middle permeable gravel + top cast-in-place trapezoidal permeable concrete cover". This can not only effectively prevent blockage and scouring, but also play a role in water permeability, reduce the seepage pressure of the bottom plate, prevent damage to the bottom plate of the energy dissipation pool, and ensure the safe operation of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the drainage hole structure of the permeable bottom plate of the energy dissipation pool of the present invention; Figure 2 The present invention Figure 1 Schematic diagram of the aa section structure of the drainage hole structure of the permeable bottom plate of the middle stilling pool; Figure 3 The present invention Figure 1 Schematic diagram of the bb section structure of the drainage hole structure of the permeable bottom plate of the middle stilling basin.

[0017] In the figure, 1. Building foundation, 2. Designed excavation elevation, 3. Sump, 4. Trapezoidal drainage pipe, 5. Drainage flower pipe, 6. Non-woven filter cloth, 7. Coarse sand, 8. Nylon rope, 9. Gravel, 10. Concrete inner wall, 11. Sandless concrete cover, 12. Energy dissipation pool bottom slab concrete, 13. Impact-resistant and wear-resistant concrete on the top of the energy dissipation pool, 14. Flow surface. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The structural type of drainage holes of the permeable bottom plate of the energy dissipation pool, such as Figure 1 As shown, "trapezoidal" drainage holes are arranged on the bottom plate of the energy dissipation pool. The structure of the "trapezoidal" drainage holes is drainage and filtration at the bottom, permeable gravel in the middle, and a cast-in-place truncated cone-shaped permeable concrete cover on the top.

[0020] A drainage filter is arranged at the bottom to prevent fine particles in the pool base from being carried away and aggravating the infiltration damage. Permeable gravel is arranged in the middle to increase the permeability of the drainage. A "trapezoidal" permeable concrete cover with a larger bottom and a smaller top is arranged on the top, which can not only play a role of permeability, but also ensure that the top permeable concrete cover is not washed away under the action of dynamic water. The structural type of the drainage hole of the permeable bottom plate of the energy dissipation pool of the present invention is a structural type of drainage hole of the permeable bottom plate of the energy dissipation pool that is anti-blocking and anti-scouring, effectively ensuring the safety of the project.

[0021] The construction method of the drainage hole structure of the permeable bottom plate of the energy dissipation pool is as follows: Step 1, excavate the building foundation 1 to the designed excavation elevation 2, and lay out a sump 3 on the basis of the designed excavation elevation 2; Step 2: Place the drainage flower pipe 5 into the sump 3, wherein the depth of the sump 3 is 50 cm to 100 cm; Step 3: Figure 2 As shown, the filter assembly is placed in the drainage flower pipe 5 and is higher than the designed excavation elevation 2; the filter assembly is specifically obtained by wrapping coarse sand 7 with a non-woven filter cloth 6 and winding and fixing it with a nylon rope 8, and the height of the filter assembly is 20cm~30cm higher than the designed excavation elevation 2; Step 4, connect the trapezoidal drainage pipe 4 to the upper end of the drainage flower pipe 5; Among them, the longitudinal section of the trapezoidal drainage pipe 4 is a trapezoidal structure, that is, the diameter of the upper end is smaller than the diameter of the lower end, and the end with a larger diameter of the drainage pipe 4 is fixedly connected to the upper end of the drainage flower pipe 5 through the steel mesh of the energy dissipation pool bottom plate; the upper and lower diameters of the drainage flower pipe 5 are consistent.

[0022] Step 5: Use the trapezoidal drainage pipe 4 and the drainage flower pipe 5 as templates to pour the energy dissipation pool bottom slab concrete 12 and the impact-resistant and wear-resistant concrete 13 respectively; The lower layer is poured with energy dissipation pool bottom slab concrete 12, and the upper layer is poured with impact-resistant and wear-resistant concrete 13.

[0023] Step 6: Fill the trapezoidal drain pipe 4 with stones 9, such as Figure 3 As shown, the inner layer of the trapezoidal drainage pipe 4 is gravel 9, and the outer layer is a concrete inner wall 10, wherein the particle size of the gravel 9 is 1 cm, the bottom of the laid gravel 9 is located 20 to 30 cm above the bottom surface of the energy dissipation pool bottom slab concrete 12, and the top of the laid gravel 9 is located 15 to 20 cm below the flow surface 14.

[0024] Step 7: pour the sandless concrete cover 11 into the trapezoidal drain pipe 4 to the elevation of the flow surface 14. The sandless concrete cover 11 is a truncated cone structure with a large bottom and a small top, and the thickness of the sandless concrete cover 11 is 15-20 cm. This structural design is not easily washed out of the drain hole under the action of high-speed water flow and pulsating pressure, thereby protecting the coarse sand and gravel at the bottom of the drain pipe and preventing the drain hole from being eroded and damaged.

[0025] Example 1 The structural type of drainage holes of the permeable bottom plate of the energy dissipation pool, such as Figure 1 As shown, "trapezoidal" drainage holes are arranged on the bottom plate of the energy dissipation pool. The structure of the "trapezoidal" drainage holes is drainage and filtration at the bottom, permeable gravel in the middle, and a cast-in-place truncated cone-shaped permeable concrete cover on the top.

[0026] A drainage filter is arranged at the bottom to prevent fine particles in the pool base from being carried away and aggravating infiltration damage. Permeable gravel is arranged in the middle to increase the permeability of drainage. A "trapezoidal" permeable concrete cover is set on the top, which can not only play a role of permeability, but also ensure that the top permeable concrete cover is not washed away under the action of dynamic water. The structural type of the drainage hole of the permeable bottom plate of the energy dissipation pool in this application is an effective anti-blocking and anti-scouring structural type of drainage hole of the permeable bottom plate of the energy dissipation pool, ensuring the safety of the project.

[0027] Example 2 The construction method of the drainage hole structure of the permeable bottom plate of the energy dissipation pool is as follows: Step 1, excavate the building foundation 1, dig out the designed excavation elevation 2, and lay out the sump 3 on the basis of the designed excavation elevation 2; Step 2: Place the drainage flower pipe 5 into the sump 3; Step 3, place the filter assembly into the drainage flower pipe 5 and place it higher than the designed excavation elevation 2; Step 4, connect the trapezoidal drainage pipe 4 to the upper end of the drainage flower pipe 5; Step 5: Use the trapezoidal drainage pipe 4 and the drainage flower pipe 5 as templates to pour the energy dissipation pool bottom slab concrete 12 and the impact-resistant and wear-resistant concrete 13 respectively; Step 6: Fill the trapezoidal drain pipe 4 with stones 9; Step 7: Pour a sandless concrete cover 11 into the trapezoidal drain pipe 4 to the level of the flow surface 14.

[0028] Example 3 The construction method of the drainage hole structure of the permeable bottom plate of the energy dissipation pool is as follows: Step 1, excavate the building foundation 1, dig out the designed excavation elevation 2, and lay out a sump 3 on the basis of the designed excavation elevation 2, the depth of the sump 3 is 50 cm; Step 2: Place the drainage flower pipe 5 into the sump 3; Step 3: Figure 2 As shown, the filter assembly is placed in the drainage flower pipe 5 and is higher than the designed excavation elevation 2; the filter assembly is specifically obtained by wrapping coarse sand 7 with a non-woven filter cloth 6 and winding and fixing it with a nylon rope 8, and the height of the filter assembly is 20 cm higher than the designed excavation elevation 2; Step 4, connect the trapezoidal drainage pipe 4 to the upper end of the drainage flower pipe 5; Step 5: Use the trapezoidal drainage pipe 4 and the drainage flower pipe 5 as templates to pour the energy dissipation pool bottom slab concrete 12 and the impact-resistant and wear-resistant concrete 13 respectively; The lower layer is poured with energy dissipation pool bottom slab concrete 12, and the upper layer is poured with impact-resistant and wear-resistant concrete 13.

[0029] Step 6: Fill the trapezoidal drain pipe 4 with stones 9, such as Figure 3 As shown, the particle size of the gravel 9 is 1 cm, the bottom of the laid gravel 9 is located 20 cm above the bottom surface of the energy dissipation pool bottom slab concrete 12, and the top of the laid gravel 9 is located 20 cm below the flow surface 14.

[0030] Step 7: pour the sandless concrete cover 11 into the trapezoidal drain pipe 4 to the elevation of the flow surface 14. The sandless concrete cover 11 is a truncated cone structure with a large bottom and a small top, and the thickness of the sandless concrete cover 11 is 20 cm.

[0031] Example 4 The construction method of the drainage hole structure of the permeable bottom plate of the energy dissipation pool is as follows: Step 1, excavate the building foundation 1, dig out the designed excavation elevation 2, and lay out a sump 3 on the basis of the designed excavation elevation 2, the depth of the sump 3 is 100 cm; Step 2: Place the drainage flower pipe 5 into the sump 3; Step 3: Figure 2 As shown, the filter assembly is placed in the drainage flower pipe 5 and is higher than the designed excavation elevation 2; the filter assembly is specifically obtained by wrapping coarse sand 7 with a non-woven filter cloth 6 and winding and fixing it with a nylon rope 8, and the height of the filter assembly is 30 cm higher than the designed excavation elevation 2; Step 4, connect the trapezoidal drainage pipe 4 to the upper end of the drainage flower pipe 5; Step 5: Use the trapezoidal drainage pipe 4 and the drainage flower pipe 5 as templates to pour the energy dissipation pool bottom slab concrete 12 and the impact-resistant and wear-resistant concrete 13 respectively; The lower layer is poured with energy dissipation pool bottom slab concrete 12, and the upper layer is poured with impact-resistant and wear-resistant concrete 13.

[0032] Step 6: Fill the trapezoidal drainage pipe 4 with gravels 9 with a particle size of 1 cm. The bottom of the laid gravels 9 is located 30 cm above the bottom surface of the energy dissipation pool bottom slab concrete 12, and the top of the laid gravels 9 is located 18 cm below the flow surface 14.

[0033] Step 7: pour the sandless concrete cover 11 into the drain pipe 4 to the elevation of the flow surface 14. The sandless concrete cover 11 is a truncated cone structure with a large bottom and a small top, and the thickness of the sandless concrete cover 11 is 18 cm.

[0034] Example 5 The construction method of the drainage hole structure of the permeable bottom plate of the energy dissipation pool is the same as that of Example 4, and the difference from Example 4 is that the depth of the sump 3 is 80 cm, the bottom of the laid gravel 9 is 25 cm above the bottom surface of the concrete 12 of the energy dissipation pool bottom plate, and the top of the laid gravel 9 is 15 cm below the flow surface 14.

[0035] Example 6 The construction method of the drainage hole structure of the permeable bottom plate of the energy dissipation pool is the same as that of Example 4, and the difference from Example 4 is that the depth of the sump 3 is 70 cm, the bottom of the laid gravel 9 is located 30 cm above the bottom surface of the concrete 12 of the energy dissipation pool bottom plate, and the top of the laid gravel 9 is located 20 cm below the flow surface 14.

Claims

1. The structural type of drainage holes of the permeable bottom plate of the energy dissipation pool is characterized by: A "trapezoidal" drainage hole is arranged on the bottom plate of the energy dissipation pool. The "trapezoidal" drainage hole structure is a bottom drainage filter, a middle part is a permeable gravel, and a top cast-in-place truncated cone-shaped permeable concrete cover.

2. The method for constructing the drainage hole structure of the permeable bottom plate of the energy dissipation pool as claimed in claim 1, characterized in that: The specific method is as follows: Step 1: excavate the building foundation (1) to the designed excavation elevation (2), and lay out a water collection pit (3) based on the designed excavation elevation (2); Step 2: Place the drainage flower pipe (5) into the sump (3); Step 3: Place the filter assembly into the drainage flower pipe (5) and place it higher than the designed excavation elevation (2); Step 4: Connect the trapezoidal drainage pipe (4) to the upper end of the drainage flower pipe (5); Step 5: Using the trapezoidal drainage pipe (4) and the drainage flower pipe (5) as templates, respectively pour the energy dissipation pool bottom slab concrete (12) and the impact-resistant and wear-resistant concrete (13); Step 6: Fill the trapezoidal drainage pipe (4) with stones (9); Step 7: Pour a sandless concrete cover (11) into the trapezoidal drainage pipe (4) to the level of the flow surface (14).

3. The method for constructing the drainage hole structure of the permeable bottom plate of the energy dissipation pool according to claim 2 is characterized in that: The depth of the sump (3) in step 2 is 50 cm to 100 cm.

4. The method for constructing the drainage hole structure of the permeable bottom plate of the energy dissipation pool according to claim 2, characterized in that: The reverse filter assembly in step 3 is specifically obtained by wrapping coarse sand (7) with non-woven filter cloth (6) and winding and fixing it with nylon rope (8). The height of the reverse filter assembly is 20 cm to 30 cm higher than the designed excavation elevation (2).

5. The method for constructing the drainage hole structure of the permeable bottom plate of the energy dissipation pool according to claim 2, characterized in that: In step 4, the longitudinal section of the drainage pipe (4) is a trapezoidal structure, and the end with a larger diameter of the drainage pipe (4) is fixedly connected to the upper end of the drainage flower pipe (5) through a steel mesh on the bottom plate of the energy dissipation pool; The drainage flower pipe (5) has the same diameter at the top and the bottom.

6. The method for constructing the drainage hole structure of the permeable bottom plate of the energy dissipation pool according to claim 2, characterized in that: In step 5, the lower layer is poured with energy dissipation pool bottom slab concrete (12), and the upper layer is poured with impact-resistant and wear-resistant concrete (13).

7. The method for constructing the drainage hole structure of the permeable bottom plate of the energy dissipation pool according to claim 2, characterized in that: In step 6, the particle size of the gravel (9) is 1 cm, the bottom of the laid gravel (9) is located 20 to 30 cm above the bottom surface of the energy dissipation pool bottom slab concrete (12), and the top of the laid gravel (9) is located 15 to 20 cm below the flow surface (14).

8. The method for constructing the drainage hole structure of the permeable bottom plate of the energy dissipation pool according to claim 2, characterized in that: In step 7, the sandless concrete cover (11) is a truncated cone structure with a larger bottom and a smaller top. The thickness of the sandless concrete cover (11) is 15-20 cm.

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