CN109723071B - Construction method of double-layer steel drum drainage system built in basement floor post-cast strip - Google Patents
Construction method of double-layer steel drum drainage system built in basement floor post-cast strip Download PDFInfo
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Abstract
The invention relates to a construction method of a drainage system with a built-in double-layer steel barrel in a basement floor post-cast strip, which mainly comprises the steps of manufacturing the double-layer steel barrel, constructing a water guide blind ditch, installing the double-layer steel barrel, installing a water pumping and grouting device, collecting water and pumping water, constructing an advanced water stop strip and a floor, grouting the double-layer steel barrel, pouring the post-cast strip and the like. Seeping water enters the barrel from the periphery of the barrel wall of the double-layer steel barrel through the water guide blind ditch, a secondary filter layer and a grouting floral tube are arranged between the inner barrel wall and the outer barrel wall of the double-layer steel barrel, grouting is carried out in the grouting floral tube after the bottom plate is poured, a waterproof post-grouting water-resisting layer is formed between the inner barrel wall and the outer barrel wall of the double-layer steel barrel, after underground water in the double-layer steel barrel is pumped out, the water pumping tube is used as the grouting tube, grouting is carried out in the double-layer steel barrel, the interior of the double-layer steel barrel is filled, and a post-pouring. The drainage system has the advantages of simple manufacture, convenient and efficient construction, good drainage effect, great reduction of drainage cost and better economic and social benefits.
Description
Technical Field
The invention relates to a construction method of a drainage system of a double-layer steel barrel built in a post-cast strip of a basement floor, belongs to the technical field of foundation pit drainage engineering, is suitable for drainage construction of the post-cast strip of the basement, and is particularly suitable for drainage construction of a closed basement with small water burst and concentrated water outlet points under pressure cracks.
Background
At present, when the drainage construction of a closed basement is carried out, a dewatering well is often arranged at the early foundation pit construction stage for pumping and draining water, the dewatering well is cut off in the middle of a bottom plate when the basement is closed, a sealing steel plate is welded after materials such as concrete and the like are poured into the well, and finally the concrete of the bottom plate is poured. The method has the disadvantages that the reserved space in the bottom plate is narrow, the depth of part of the bottom plate is too deep, the dewatering well is easily damaged in the actual construction process, the sealing operation of the dewatering well is complex, the effect is poor and the like, so that the later serious water permeation risk and the floating hidden danger of the basement are caused.
The method for arranging the temporary water collecting pit at the position of the post-cast strip after the basement bottom plate subsides is also adopted in the drainage construction of the closed basement, the drainage corrugated pipe is embedded in advance, the novel drainage device is installed on the upper part of the drainage corrugated pipe, and finally, the drainage well and the post-cast strip are poured together for sealing, so that the drainage problem of the basement can be well solved, the corrugated pipe is easy to deform and shift, and the water purifying function of binding geotextile outside the corrugated pipe is limited.
Aiming at the problem of drainage of the closed basement foundation pit, a construction method of a drainage system with a double-layer steel barrel built in a post-cast strip of a basement floor is developed, the drainage system can properly replace the function of a dewatering well arranged in the early foundation pit construction stage in the later construction, the early dewatering well can be closed in advance, the drainage effect of the basement in the basement and main structure construction stage is guaranteed, the drainage system is simple in structure, the drainage cost is low, and the drainage problem of the basement is well solved. The invention is developed under the background, and can generate better economic and social benefits when being applied to actual construction.
Disclosure of Invention
The invention aims to solve the problems that a reserved space in a traditional foundation pit dewatering and drainage bottom plate is narrow, part of the bottom plate is too deep, a dewatering well is easy to damage in the actual construction process, the sealing operation of the dewatering well is complex, the effect is poor and the like, provides a construction method of a dewatering and drainage system with a built-in double-layer steel barrel in a post-cast strip of a basement bottom plate, and well solves the problem of dewatering and drainage of a basement.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention relates to a construction method of a drainage system of a double-layer steel barrel built in a post-cast strip of a basement floor, which is characterized by comprising the following steps:
step one, manufacturing a double-layer steel drum: welding an inner layer steel barrel and an outer layer steel barrel on a steel barrel bottom plate, welding a water-stopping steel ring on the outer side of the outer layer steel barrel, and welding a plurality of fixing legs on the lower side of the steel barrel bottom plate; manufacturing a bucket opening steel plate slightly larger than the outer layer steel bucket according to the size of the outer layer steel bucket, and reserving a grouting floral tube hole, a water pumping tube hole and an exhaust tube hole on the bucket opening steel plate;
step two, construction of the water guide blind ditch: excavating a water guide blind ditch near the water seepage point, and collecting the underground water around the water guide blind ditch;
step three, mounting the double-layer steel drum: placing a double-layer steel barrel at a designated position in a water guide blind ditch interval, inserting a fixing leg into an original soil layer, sleeving a circular dense steel wire gauze bag filled with a graded filter layer inside on the outer side of an inner-layer steel barrel, filling a gap between an outer-layer steel barrel and the inner-layer steel barrel with a gravel layer, embedding a grouting floral tube at the center of the gravel layer in a filling process, laying graded gravel around the double-layer steel barrel, and connecting the graded gravel with the water guide blind ditch;
step four, water pumping and grouting equipment installation: a bucket opening steel plate is welded at the top of the double-layer steel bucket, and a water pumping pipe and an exhaust pipe with valves are respectively installed and fixed on the bucket opening steel plate through a water pumping pipe hole and an exhaust pipe hole; meanwhile, the other end of the grouting floral tube also extends into the grouting floral tube hole and is fixed on the steel plate at the opening of the barrel;
step five, water collection and pumping: underground water seeps into the double-layer steel barrel through the water guide blind ditch to collect water, and the water pump is connected with a water pumping pipe to pump water;
step six, construction of an advanced water stop and a bottom plate: sequentially constructing an upper advanced water stop and a bottom plate;
seventhly, grouting by using a double-layer steel drum: grouting in the post-pouring belt closed forward grouting perforated pipe, combining the gravel layer and the slurry to form a waterproof post-grouting water-resisting layer, isolating external underground water, pumping the underground water in the double-layer steel barrel, using the water pumping pipe as a grouting pipe, grouting the interior of the double-layer steel barrel to form quick-setting grouting body, and discharging redundant gas in the interior through an exhaust pipe;
step eight, pouring a post-pouring belt: and (3) finishing grouting by a double-layer steel barrel, pulling out the grouting floral tube, the water pumping tube and the exhaust tube before the grout is not solidified, sealing the grouting floral tube hole, the water pumping tube hole and the exhaust tube hole reserved on the opening steel plate, and pouring a post-pouring zone.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) by utilizing the structure of the double-layer steel barrel, a gravel layer and a graded filter layer are arranged in the double-layer steel barrel for filtering for multiple times, so that underground water can be effectively recycled, and tap water consumption is reduced;
(2) the double-layer steel drum is low in manufacturing cost, the double-layer steel drum is poured in the post-pouring belt, the foundation is not affected, the construction cost is low, and the popularization and the application are easy;
(3) the supporting legs at the bottom of the double-layer steel drum can be directly inserted into the original soil layer to play a role in fixing; and because the double-layer steel barrel is only provided with the water through holes on the side wall, the underground water can only flow into the periphery of the double-layer steel barrel through the water guide blind ditch, so that the problems of displacement, looseness and side turning of the double-layer steel barrel caused by water flowing from the bottom are avoided;
(4) when the construction of the basement bottom plate is finished, grouting is carried out between the barrel walls through the grouting pipes, and the gravel layer becomes a post-grouting water-resisting layer after grouting, so that the double-layer steel barrel forms a closed structure, and favorable conditions are provided for sealing post-grouting in the steel barrel;
(5) by adopting the drainage system with the double-layer steel barrel arranged in the post-cast strip of the basement floor and the construction method, the drainage effect is good during use, the sealing operation at the later stage is simple and convenient, the sealing effect is good, the drainage cost is low during construction, the construction is economic and environment-friendly, and the drainage system has good technical and economic benefits.
Drawings
FIG. 1 is a schematic structural view of a drainage system of a double-layer steel barrel built in a post-cast strip of a basement floor;
FIG. 2 is a sectional view taken along line B-B of FIG. 1;
FIG. 3 is a schematic view of a grouting pre-sealing structure of a drainage system of a double-layer steel barrel built in a basement floor post-cast strip;
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 3;
FIG. 5 is a schematic view of the post-cast strip after complete closure;
FIG. 6 is a cross-sectional view taken along line D-D of FIG. 5;
FIG. 7 is a schematic view of a double-layer steel barrel structure;
FIG. 8 is a sectional view taken along line A-A of FIG. 7;
fig. 9 is a schematic view of the structure of a circular dense mesh steel wire gauze bag.
In the figure: 1. the water-collecting type water-collecting device comprises a raw soil layer, 2. a water-guiding blind ditch, 3. an advanced water stop belt, 4. a bottom plate, 5. graded gravel, 6. a double-layer steel barrel, 601. a water inlet hole, 602. a steel barrel bottom plate, 603. a fixing leg, 604. an outer-layer steel barrel, 605. an inner-layer steel barrel, 7. a circular dense steel wire gauze bag, 8. a graded filtering layer, 9. a gravel layer, 10. a water-stopping steel ring, 11. a barrel mouth steel plate, 12. a grouting flower pipe, 13. a water pumping pipe, 14. an exhaust pipe, 15. a valve, 16. a rear grouting water-resisting layer, 17. a rear pouring belt, 18. quick-setting slurry and 19. water collection.
Detailed Description
For further understanding of the contents of the present invention, the present invention will be described in detail with reference to examples, which are provided for the purpose of explanation and are not intended to limit the present invention.
Referring to the attached drawings 1 and 2, the built-in double-layer steel barrel drainage system for the underground chamber bottom plate post-cast strip comprises a water guide blind ditch 2, an advanced water stop belt 3, graded gravel 5, a double-layer steel barrel 6, an annular dense steel wire gauze bag 7, a graded filter layer 8, a gravel layer 9, a water stop steel ring 10, a barrel mouth steel plate 11, a grouting flower pipe 12, a water pumping pipe 13, an exhaust pipe 14, a post-grouting water stop layer 16 and a post-cast strip 17. The double-layer steel barrel 6 is of a double-layer steel barrel structure consisting of an outer-layer steel barrel 604, an inner-layer steel barrel 605 and a steel barrel bottom plate 602, and the bottom of the steel barrel bottom plate 602 is provided with a fixing leg 603; the outer layer steel barrel 604 and the inner layer steel barrel 605 are uniformly provided with a plurality of water inlet holes 601; the ring-shaped dense-mesh steel wire gauze bag 7 is filled with graded broken stones and sleeved on the inner layer steel barrel 605 to form a graded filter layer 8; a gravel layer 9 is arranged between the graded filter layer 8 and the outer steel barrel 604, and a grouting floral tube 12 is pre-buried in the gravel layer 9; the bucket opening steel plate 11 is provided with a plurality of grouting floral tube holes, and the center of the bucket opening steel plate 11 is provided with a water pumping pipe hole and an air exhaust pipe hole; an exhaust pipe 14 and a water pumping pipe 13 are arranged on the bucket opening steel plate 11, and a valve 15 is respectively arranged at the upper end of each bucket opening steel plate; the rear grouting water-resisting layer 16 is formed after grouting the gravel layer 9 through the grouting floral tubes 12 after water descending and drainage are finished; a water-stopping steel ring 10 is arranged at the contact position of the double-layer steel barrel 6 and the advanced water stop belt 3; the double-layer steel barrel 6 is fixed on the original soil layer 1 through a fixing leg 603 at the bottom, and graded sand 5 is filled between the double-layer steel barrel and the water guide blind ditch 2.
As shown in fig. 3, 4, 5 and 6, the post-grouting water-stop layer 16 is a water-stop layer formed after grouting the gravel layer 9 through the grouting floral tube 12 after the water lowering and drainage is finished; before the post-cast strip 17 is sealed and poured, the quick-setting grouting body 18 is poured into the double-layer steel barrel 6 through the water pumping pipe 13.
As shown in fig. 7 and 8, the double-layer steel barrel 6 has a double-layer steel barrel structure consisting of an outer-layer steel barrel 604, an inner-layer steel barrel 605 and a steel barrel bottom plate 602, and the bottom of the steel barrel bottom plate 602 is provided with a fixing leg 603; the outer layer steel barrel 604 and the inner layer steel barrel 605 are uniformly provided with a plurality of water inlet holes 601.
As shown in fig. 9, the ring-shaped dense-mesh steel wire gauze bag 7 is filled with graded crushed stone and is sleeved on the inner steel barrel 605 to form a graded filter layer 8.
The construction method of the drainage system of the double-layer steel barrel built in the basement floor post-cast strip comprises the following steps:
step one, manufacturing a double-layer steel drum: an inner layer steel barrel 605 and an outer layer steel barrel 604 are welded on the steel barrel bottom plate 602, a water-stopping steel ring 10 is welded on the outer side of the outer layer steel barrel 604, and a plurality of fixing legs 603 are welded on the lower side of the steel barrel bottom plate 602; manufacturing a bucket opening steel plate 11 slightly larger than the outer layer steel bucket 604 corresponding to the size of the outer layer steel bucket 604, and reserving a grouting floral tube hole, a water pumping tube hole and an air exhaust tube hole on the bucket opening steel plate 11;
step two, construction of the water guide blind ditch: excavating a water guide blind ditch 2 near the water seepage point, and collecting the underground water around the water guide blind ditch 2;
step three, mounting the double-layer steel drum: a double-layer steel barrel 6 is placed at a designated position in a section of the water guide blind ditch 2, the fixing legs 603 are inserted into the original soil layer 1, the annular dense steel wire gauze bag 7 of the inner filling grading filter layer 8 is sleeved outside the inner-layer steel barrel 605, the gap between the outer-layer steel barrel 604 and the inner-layer steel barrel 605 is filled with the gravel layer 9, the grouting flower pipe 12 is pre-embedded at the center of the gravel layer 9 in the filling process, and grading gravel 5 is laid around the double-layer steel barrel 6 and connected with the water guide blind ditch 2;
step four, water pumping and grouting equipment installation: a bung steel plate 11 is welded on the top of the double-layer steel 6, and a water pumping pipe 13 with a valve 15 and an exhaust pipe 14 are respectively installed and fixed on the bung steel plate 11 through a water pumping pipe hole and an exhaust pipe hole; meanwhile, the other end of the grouting floral tube 12 also extends into the grouting floral tube hole and is fixed on the steel plate 11 at the opening of the barrel;
step five, water collection and pumping: underground water seeps into the double-layer steel barrel 6 through the water guide blind ditch 2 to form water collection 19, and the water collection 19 is connected with a water pumping pipe 13 by a water pump to pump water;
step six, construction of an advanced water stop and a bottom plate: sequentially constructing an upper advanced water stop 3 and a bottom plate 4;
seventhly, grouting by using a double-layer steel drum: grouting in the front grouting floral tube 12 after the post-cast strip is closed, combining the gravel layer 9 with the slurry to form a waterproof post-grouting water-resisting layer 16, isolating external underground water, pumping out the underground water in the double-layer steel barrel 6, using the water pumping tube 13 as a grouting tube, grouting the interior of the double-layer steel barrel 6 to form quick-setting grouting body 18, and discharging redundant gas in the interior through the exhaust tube 14;
step eight, pouring a post-pouring belt: and (3) finishing grouting by the double-layer steel barrel, pulling out the grouting floral tube 12, the water pumping tube 13 and the exhaust tube 14 before grout is not solidified, sealing the grouting floral tube hole, the water pumping tube hole and the exhaust tube hole reserved on the bunghole steel plate 11, and pouring a post-pouring belt 17.
The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (1)
1. The construction method of the drainage system of the double-layer steel barrel built in the post-cast strip of the basement floor is characterized by comprising the following steps:
step one, manufacturing a double-layer steel drum: an inner layer steel barrel (605) and an outer layer steel barrel (604) are welded on a steel barrel bottom plate (602), a water-stopping steel ring (10) is welded on the outer side of the outer layer steel barrel (604), and a plurality of fixing legs (603) are welded on the lower side of the steel barrel bottom plate (602); manufacturing a bucket opening steel plate (11) slightly larger than the outer layer steel bucket (604) according to the size of the outer layer steel bucket (604), and reserving a grouting floral tube hole, a water pumping tube hole and an exhaust tube hole on the bucket opening steel plate (11);
step two, construction of the water guide blind ditch: a water guide blind ditch (2) is excavated near the water seepage point, and the groundwater around is collected through the water guide blind ditch (2);
step three, mounting the double-layer steel drum: a double-layer steel barrel (6) is placed at a designated position in a section of the water guide blind ditch (2), a fixing leg (603) is inserted into an original soil layer (1), a circular dense steel wire gauze bag (7) of an inner filling grading filter layer (8) is sleeved on the outer side of an inner-layer steel barrel (605), a gravel layer (9) is filled in a gap between an outer-layer steel barrel (604) and the inner-layer steel barrel (605), a grouting flower pipe (12) is pre-embedded at the center of the gravel layer (9) in the filling process, grading gravel (5) is laid around the double-layer steel barrel (6) and connected with the water guide blind ditch (2);
step four, water pumping and grouting equipment installation: a bung hole steel plate (11) is welded at the top of the double-layer steel drum (6), and a water pumping pipe (13) with a valve (15) and an exhaust pipe (14) are respectively fixed on the bung hole steel plate (11) through a water pumping pipe hole and an exhaust pipe hole; meanwhile, the other end of the grouting floral tube (12) also extends into the grouting floral tube hole and is fixed on the steel plate (11) at the opening of the barrel;
step five, water collection and pumping: underground water seeps into the double-layer steel barrel (6) through the water guide blind ditch (2) to form water collection (19), and a water pump is connected with a water pumping pipe (13) to pump water;
step six, construction of an advanced water stop and a bottom plate: sequentially constructing an upper advanced water stop (3) and a bottom plate (4);
seventhly, grouting by using a double-layer steel drum: grouting in the front grouting floral tube (12) before the rear pouring belt is closed, combining the gravel layer (9) and the grout to form a waterproof rear grouting water-resisting layer (16), isolating external underground water, pumping out the underground water in the double-layer steel barrel (6), using the water pumping tube (13) as a grouting tube, grouting the interior of the double-layer steel barrel (6) to form quick-setting grouting body (18), and discharging the redundant gas in the interior through the exhaust pipe (14);
step eight, pouring a post-pouring belt: and (3) finishing grouting by a double-layer steel barrel, pulling out the grouting floral tube (12), the water pumping tube (13) and the exhaust pipe (14) before grout is not solidified, sealing the grouting floral tube hole, the water pumping tube hole and the exhaust pipe hole reserved on the bunghole steel plate (11), and pouring a post-pouring belt (17).
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| CN111173015A (en) * | 2020-01-21 | 2020-05-19 | 上海勘察设计研究院(集团)有限公司 | Circulating inflatable type submersible dewatering and dewatering well structure and dewatering method |
| CN113605431A (en) * | 2021-09-17 | 2021-11-05 | 中建八局天津建设工程有限公司 | Plugging structure for water collecting pit and construction method thereof |
| CN114960690B (en) * | 2022-06-02 | 2023-06-09 | 中国建筑第八工程局有限公司 | Ditch backfilling and guiding tool for automatically separating natural graded sand and construction method thereof |
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