CN212405178U - Deep water falling hole processing structure of backfill foundation in large karst depression - Google Patents
Deep water falling hole processing structure of backfill foundation in large karst depression Download PDFInfo
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- CN212405178U CN212405178U CN202020545578.6U CN202020545578U CN212405178U CN 212405178 U CN212405178 U CN 212405178U CN 202020545578 U CN202020545578 U CN 202020545578U CN 212405178 U CN212405178 U CN 212405178U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000012545 processing Methods 0.000 title claims abstract description 11
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 38
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 24
- 239000004576 sand Substances 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 8
- 238000001556 precipitation Methods 0.000 abstract description 2
- 238000004162 soil erosion Methods 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses a deep water-falling hole processing structure of a backfill foundation in a large karst depression, which comprises a wedge-shaped groove and a reinforced concrete wedge body, wherein the wedge-shaped groove can be formed by expanding and digging a face-holding stratum at the hole of the water-falling hole, the reinforced concrete wedge body is arranged in the wedge-shaped groove, and a vertical upward cast iron pipe is arranged in the reinforced concrete wedge body; fine sand is laid above the wedge-shaped body of the reinforced concrete, a foundation backfill layer is filled above the fine sand, a ground building is built on the ground at the top of the foundation backfill layer, the upper end of the cast iron pipe extends to the ground and is communicated with a drainage ditch arranged on the ground, and the two ends of the drainage ditch are communicated with a water intercepting ditch arranged on the toe of the slope. The utility model discloses short-term heavy precipitation to in the large-scale karst depression can in time be excreted, can not cause depression waterlogging problem, and the reinforced concrete wedge has avoided the soil erosion and water loss problem and the ground stability problem in the backfill ground simultaneously. By applying the treatment method, the stability of the backfill foundation in the large karst depression and the use safety of the building can be ensured.
Description
Technical Field
The utility model relates to a karst ground processing technology field specifically is a backfill ground deep hole of falling into water processing structure in large-scale karst depression.
Background
With the rapid development of urbanization in western regions at present, the contradiction between more people and less places is increasingly prominent. It is more and more common to use a large karst depression as a construction land after backfilling treatment. The development of one or more overboard holes at the bottom of a large karst depression is a common geological phenomenon in karst areas.
Aiming at the water falling hole at the bottom of the depression, the currently generally adopted technical method is mainly that before the foundation is backfilled, broken stones or concrete are adopted to block the water falling hole, and then the foundation is backfilled. The processing technology has better applicability to the situation that the field area is positioned in a small low-lying backfill area, but has great hidden danger after processing under the condition that the field area is positioned in a large karst depression. The reason is mainly that large karst depression has a large catchment area, and the peripheral topography of the depression is still high after the foundation of the inner field area of the depression is backfilled. If concrete is adopted to seal the opening of the water falling hole, under the condition that the rainfall supply in the depression is large in rainy season, because the drainage channel is cut off, waterlogging is easily caused, and meanwhile, the underground water level in the backfilled foundation is quickly lifted, so that the ground surface structure is easily floated, and the stability and the safety of the ground surface structure are influenced; if the falling water hole is backfilled by the broken stones, water in the backfilled foundation can be drained to a certain degree, but the broken stones are used as a plugging structure body, the problem of water and soil loss in the backfilled foundation is easily caused by high porosity, the ground surface buildings can be settled due to long-term development, and meanwhile, under the condition that the size of the falling water hole is large, the foundation bearing capacity and stability are uncertain only by backfilling the broken stones.
Therefore, aiming at the problem of treating the water falling hole at the deep part of the backfilled foundation in the large karst depression, various influencing factors need to be comprehensively considered, and a new method is adopted to solve the problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a, the new method of application is through overcoming the ground stability problem that the deep hole of falling into water of ground brought and backfill the problem that a large amount of water that come from the earth's surface are difficult to handle, can guarantee the stability of backfilling the ground in the large-scale karst depression and depression system water supply and excrete noncongestion, has also guaranteed the security of building the use of structure in the field area. Meanwhile, the water balance state of the original rock depression system is also maintained.
The technical scheme of the utility model as follows:
a deep water-falling hole processing structure of a backfill foundation in a large karst depression comprises a wedge-shaped groove formed by expanding and digging a visible stratum at a hole of the water-falling hole and a reinforced concrete wedge body arranged in the wedge-shaped groove, wherein a cast iron pipe which is vertically upward is arranged in the reinforced concrete wedge body; fine sand is laid above the wedge-shaped body of the reinforced concrete, a foundation backfill layer is filled above the fine sand, a ground building is built on the ground at the top of the foundation backfill layer, the upper end of the cast iron pipe extends to the ground and is communicated with a drainage ditch arranged on the ground, and the two ends of the drainage ditch are communicated with a water intercepting ditch arranged on the toe of the slope.
The reinforced concrete wedge-shaped body is provided with a boss which is used for being connected with the cast iron pipe, the lower part of the boss is provided with a hole which is communicated with the water falling hole, and the diameter of the boss hole is equivalent to the equivalent size of the water falling hole.
Furthermore, plum blossom-shaped drill holes are distributed on the pipe section with the length of 1m above the upper end surface of the wedge-shaped body of the reinforced concrete at the lower end part of the cast iron pipe, and the pipe section within the range of 1m is wound and bound by adopting a double-layer steel wire filter screen.
Furthermore, the depth of the boss is 1/5 of the depth H of the wedge-shaped body of the reinforced concrete, the depth is not less than 10cm, and the pipe diameter D of the cast iron pipe is larger than the diameter D of the opening below the boss.
Further, the method for processing the deep water falling hole of the backfill foundation in the large karst depression by adopting the structure comprises the following steps:
s1, surveying a water falling hole in the large karst depression, counting the plane size of a hole opening, and designing a reinforced concrete wedge-shaped body;
s2, excavating a wedge-shaped groove;
s3, pouring and constructing a reinforced concrete wedge;
s4, after the strength of the wedge-shaped body of the reinforced concrete meets the specification requirement, grouting the side wall and the lower part of the wedge-shaped body of the reinforced concrete by adopting cement slurry;
s5, connecting the reinforced concrete wedge with the cast iron pipe;
s6, paving and filling fine sand in the depth range of the double-layer steel wire filter screen wound on the cast iron pipe;
s7, backfilling the foundation backfill layer, and simultaneously embedding the cast iron pipe;
s8, constructing a catch basin on the periphery of a contact line between the earth surface of the backfill foundation and the original earth surface;
and S9, constructing a drainage ditch, and communicating the drainage ditch with the intercepting ditch and the cast iron pipe.
Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:
the utility model relates to an ingenious, the construction is simple, can in time excrete the short-term heavy precipitation in the large-scale karst depression, can not cause depression waterlogging problem, and the reinforced concrete wedge has avoided the soil erosion and water loss problem and the ground stability problem in the backfill ground simultaneously. By applying the treatment method, the stability of the backfill foundation in the large karst depression and the use safety of the building can be ensured, and the effect is good.
Drawings
FIG. 1 is a schematic diagram of a deep water falling hole treatment structure of a backfilled foundation;
FIG. 2 is a structural view of a wedge-shaped body of a cast iron drain pipe and reinforced concrete;
fig. 3 is a structural view of a wedge of reinforced concrete.
Description of reference numerals: 1-confluence area, 2-foundation backfill layer, 3-soluble rock stratum, 4-water falling hole, 5-intercepting ditch, 6-drainage ditch, 7-cast iron pipe, 8-ground building, 9-fine sand, 10-reinforced concrete wedge, 11-double-layer steel wire filter screen, 12-wedge groove and 13-lug boss.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1-2, the present invention provides a technical solution:
1, basic principle:
the method mainly comprises the following three principles: firstly, the opening of the water falling hole is effectively plugged by adopting a reinforced concrete wedge-shaped body, so that the stability of the backfilled foundation is ensured, and the problem of water and soil loss is avoided; secondly, the water interception and drainage system on the earth surface of the site area is converged into a pipeline pre-buried in the foundation, so that the water can be effectively drained in time through an in-situ karst pipeline system; thirdly, under the condition that the earth surface of the backfill region is not completely hardened, rainfall seeps into the vicinity of the original water falling hole after seeping into the backfill foundation and can seep into the original karst pipeline to be discharged through the holes at the lower end part of the pipeline structure.
2 operating procedure
As shown in fig. 1 to 3, a method for treating a overboard hole at the deep part of a backfill foundation in a large karst depression is characterized by comprising the following steps:
step one, investigating a water falling hole 4 in a large karst depression 1, counting the plane size of a hole opening, and designing a reinforced concrete wedge 10. The utility model discloses the mainly suitable for fall into water hole entrance to a cave dominant dimension direction is the condition within 5 m. The thickness of the reinforced concrete wedge-shaped body 10 is processed according to 1-2 times of the dominant size of the opening of the water falling hole and the overlapping length of the reinforced concrete wedge-shaped body and the surrounding rock mass according to 1 time of the thickness of the reinforced concrete wedge-shaped body 10, the concrete adopts normal C25 concrete, and the type and the structure of the reinforcing steel bars are arranged and the like and are determined by calculation through the backfill depth of a backfill layer and the like. The above specifications all finally satisfy the bending resistance and shearing resistance calculations of the reinforced concrete wedge 10.
Step two: wedge-shaped grooves 12 are excavated. And (3) excavating a wedge-shaped groove 12 in the soluble rock stratum according to the geometric dimension of the reinforced concrete wedge-shaped body 10 in the step one, wherein the length, the width and the depth of the wedge-shaped groove are matched with those of the reinforced concrete wedge-shaped body 10.
Step three: and pouring the reinforced concrete wedge-shaped body 10. And constructing a wedge body 10 on the excavated wedge-shaped groove 12, reserving a boss 13 and ensuring the geometric dimension relation of D & gtd. The boss 13 is 1/5H deep and not less than 10cm, and is used as the interface with the cast iron pipe 7. The diameter of the hole at the lower part of the lug boss 13 is equivalent to the equivalent size of the hole of the water falling hole 4.
Step four: and after the strength of the reinforced concrete wedge-shaped body 10 meets the standard requirement, grouting the side wall and the lower part of the reinforced concrete wedge-shaped body by adopting cement paste, and ensuring the plugging effect.
Step five: the reinforced concrete wedge 10 is connected with the cast iron pipe 7. Wherein the lower end part of the cast iron pipe 7 is positioned above the upper end surface of the wedge-shaped body 10 to ensure that 1m of length is provided with plum blossom-shaped drill holes, and a double-layer steel wire filter screen (200 meshes) 11 is adopted for winding and binding within the range of 1 m.
Step six: and fine sand 9 is paved and filled in the depth range of a double-layer steel wire filter screen (200 meshes) 11 wound on the cast iron pipe 7. The structure is mainly used for ensuring that a small amount of seepage water in the foundation can be drained to a karst pipeline system at the lower part of the water falling tunnel 4 through the mesh gaps.
Step seven: and backfilling and treating the foundation backfill layer 2 according to the foundation design scheme, and simultaneously embedding the cast iron pipe 7.
Step eight: and constructing a intercepting ditch 5 on the periphery of a contact line between the earth surface of the backfilled foundation 2 and the original earth surface. The size of the intercepting drain is determined by calculation according to the conditions such as the confluence area and the like.
Step nine: and constructing a drainage ditch 6, and communicating the drainage ditch with the intercepting ditch 5 and the cast iron pipe 7. The size of the drainage ditch 6 is determined according to the size of the make-up water.
Of course, the above is only the specific application example of the present invention, and the present invention has other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope claimed by the present invention.
Claims (4)
1. The utility model provides a backfill foundation deep hole in water processing structure in large-scale karst depression, its characterized in that: comprises a wedge-shaped groove (12) formed by expanding and digging a visible stratum (3) at the opening of a water falling hole (4) and a reinforced concrete wedge-shaped body (10) arranged in the wedge-shaped groove (12), wherein a cast iron pipe (7) which is vertically upward is arranged in the reinforced concrete wedge-shaped body (10); fine sand (9) is paved above the reinforced concrete wedge-shaped body (10), a foundation backfill layer (2) is filled above the fine sand (9), a ground building (8) is built on the ground at the top of the foundation backfill layer (2), the upper end of the cast iron pipe (7) extends to the ground and is communicated with a drainage ditch (6) arranged on the ground, and the two ends of the drainage ditch (6) are communicated with a water intercepting ditch (5) arranged at the toe of a slope.
2. The large karst depression internal backfilling foundation deep overboard hole treatment structure of claim 1, wherein: a boss (13) is reserved in the reinforced concrete wedge-shaped body (10) and used for being connected with the cast iron pipe (7), a hole is formed in the lower portion of the boss (13) and communicated with the water falling hole (4), and the diameter of the hole of the boss (13) is equivalent to the equivalent size of the hole of the water falling hole (4).
3. The large karst depression internal backfilling foundation deep overboard hole treatment structure of claim 1, wherein: plum blossom-shaped drilled holes are distributed in the lower end part of the cast iron pipe (7) and are positioned at the position 1m above the upper end surface of the reinforced concrete wedge-shaped body (10), and the pipe section within the range of 1m is wound and bound by adopting a double-layer steel wire filter screen (11).
4. The large karst depression internal backfilling foundation deep overboard hole processing structure of claim 2, wherein: the depth of the boss (13) is 1/5 of the depth H of the reinforced concrete wedge-shaped body (10) and is not less than 10cm, and the pipe diameter D of the cast iron pipe (7) is greater than the diameter D of the opening below the boss (13).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020545578.6U CN212405178U (en) | 2020-04-14 | 2020-04-14 | Deep water falling hole processing structure of backfill foundation in large karst depression |
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| CN202020545578.6U CN212405178U (en) | 2020-04-14 | 2020-04-14 | Deep water falling hole processing structure of backfill foundation in large karst depression |
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| CN212405178U true CN212405178U (en) | 2021-01-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424685A (en) * | 2020-04-14 | 2020-07-17 | 中国电建集团贵阳勘测设计研究院有限公司 | Deep water falling hole processing structure and method for backfilling foundation in large karst depression |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424685A (en) * | 2020-04-14 | 2020-07-17 | 中国电建集团贵阳勘测设计研究院有限公司 | Deep water falling hole processing structure and method for backfilling foundation in large karst depression |
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