CN110847327B - Water-proof and drainage construction method for large-area basement roof - Google Patents
Water-proof and drainage construction method for large-area basement roof Download PDFInfo
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- CN110847327B CN110847327B CN201911119812.7A CN201911119812A CN110847327B CN 110847327 B CN110847327 B CN 110847327B CN 201911119812 A CN201911119812 A CN 201911119812A CN 110847327 B CN110847327 B CN 110847327B
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/02—Arrangement of sewer pipe-lines or pipe-line systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
- E03F5/101—Dedicated additional structures, interposed or parallel to the sewer system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses a water-proof and drainage construction method of a large-area basement roof, which reasonably divides the large area into a plurality of continuous regular square area units according to the area of the basement roof and the range of an overground building, divides the edge position of the basement roof or the position where the basement roof is connected with the overground building into corner area units with partial peripheral edges automatically formed, sets water-proof and drainage structures around and in each area unit, ensures that the water-proof and drainage structures in the area units are communicated with the water-proof and drainage structures around the area units, and the adjacent area units are communicated through the water-proof and drainage structures around the area units, and the square area units adjacent to the drainage structures around the corner area units are communicated with a drainage open ditch of a community rainwater pipe network. When the building layer of the water-proof and drainage structure of the basement roof is constructed, the area unit corresponding to the range of the completed basement roof is constructed, and the water-proof and drainage structure of the basement roof is constructed first if the area unit is seen to be the first.
Description
Technical Field
The invention belongs to the field of basement roof water-proof construction, and particularly relates to a water-proof construction method for a large-area basement roof.
Background
For basement roofs, water protection is important. The traditional basement roof water-proof method mainly comprises the following two steps:
one is to make open trenches on a building layer, and in order to ensure beautiful appearance, the spacing between the open trenches is larger, the building layer is inclined towards the drainage ditch by 0.5%, and the inside of the drainage ditch is inclined by 0.5%. This practice often results in undesirable drainage effects for large area basement roofs. Because the large-area basement roof is large in area and long in slope, each place of the large-area roof is difficult to meet the designed slope requirement, the situation that the existing place is unsmooth in drainage is easy to occur, and finally the situation that the drainage effect of the whole large-area roof is not ideal is caused.
And the other is to lay a drainage plate on the building layer, and the drainage plate is connected with the edge of the building through blind ditches. The method needs to lay the hydrophobic plate, and the thickness of the concrete of the building layer needs to be increased when the hydrophobic plate is laid, because the hydrophobic plate cannot be pressed when the concrete is too thin, the hydrophobic plate is easy to generate elastic deformation. According to experience, in order to avoid elastic deformation of the hydrophobic plate, the concrete layer needs to be at least 30cm thick, and construction cost is greatly increased.
From the two methods, when the building layer is constructed, the building layer needs to be constructed from one position to the planning direction in sequence, and the building layer cannot be constructed in blocks, so that the construction period is influenced.
Disclosure of Invention
The invention mainly aims to provide a method for constructing a water-proof and drainage structure of a large-area basement roof by each block construction, which not only can improve the construction progress, but also can improve the water-proof and drainage effect.
The water-proof and drainage method for the large-area basement roof provided by the invention comprises the following steps of:
(1) Dividing the whole area design of the basement roof into a plurality of continuous square area units and corner area units at the periphery of the square area units according to the area of the basement roof and the range of the above-ground building;
(2) Carrying out waterproof and drainage structure design on each square area unit, and simultaneously enabling drainage structures between adjacent square area units to be communicated;
(3) Designing a waterproof and drainage structure of each corner area unit, and simultaneously communicating the corner area units with the drainage structures of adjacent square area units and the drainage open channels of the community rainwater pipe network;
(4) And performing waterproof and drainage structure construction on the area units corresponding to the range of the completed basement roof.
In an implementation manner of the above technical solution, the water-proof structure of the square area unit includes first-stage drainage blind ditches around the square area unit and N second-stage drainage blind ditches arranged in parallel in the square area unit, the square area unit is divided into n+1 rectangular small areas through the second-stage drainage blind ditches, and two ends of each second-stage drainage blind ditch are respectively communicated with the first-stage drainage blind ditches on the corresponding sides.
In an implementation manner of the above technical scheme, the waterproof and drainage structure of the corner area unit comprises a first-stage drainage blind ditch and/or an edge drainage blind ditch on the periphery of the corner area unit, a plurality of second-stage drainage blind ditches in the unit are communicated with the drainage open ditches of the community rainwater pipe network, the first-stage drainage open ditches of the corner area unit are communicated with the first-stage drainage blind ditches of the adjacent square area units, and two ends of the second-stage drainage blind ditches are respectively communicated with the first-stage drainage blind ditches and/or the edge drainage blind ditches on the corresponding sides.
In one embodiment of the above technical solution, the bottom of the first-level drainage blind ditch is located at the middle position to the two sides by 0.5%, the ditch is filled with geotextile for wrapping pebbles, a honeycomb type water permeable pipe is arranged in the pebbles, and the top surface formed by wrapping the pebbles with the geotextile is an arc surface higher than the slopes at the two sides.
In one embodiment of the above technical solution, the secondary drainage blind ditches are uniformly distributed in parallel in each area unit, the slope of the bottom of each secondary drainage blind ditch is found from the middle position to two sides by 0.5%, pebbles wrapped by geotextiles are filled in the ditches, and the top surface formed by the pebbles wrapped by the geotextiles is an arc surface higher than the slopes at two sides.
In one embodiment of the above technical solution, the two ends of the short sides of the building layer between the first-stage drainage blind ditches and/or between the edge drainage blind ditches and the adjacent second-stage drainage blind ditches in the square unit area and the corner area unit are located 2% -3% from the middle to the two sides, and meanwhile, the two sides of the building layer are located 0.5% -1% from the first-stage drainage blind ditches and/or the edge drainage blind ditches, and the long sides are located 2% -3% from the second-stage drainage blind ditches symmetrically with respect to the central plane of the width direction of the building layer, and meanwhile, the two sides are located 0.5% -1% from the central plane of the length direction.
In one embodiment of the above technical solution, a vertical drain pipe is disposed at a crossing of the first-stage drain blind ditch, and water is led into the water collecting structure of the basement bottom plate through the drain pipe.
In an embodiment of the foregoing technical solution, the arrangement and structure of the edge drainage blind drain of the corner area unit includes the following three situations:
(1) Basement roof edge does not have brickwork, does not have shear force wall
The edge drainage blind ditches of the corner area units are arranged in parallel with the drainage open ditches of the district rainwater pipe network and are communicated with the drainage open ditches through drainage pipes, and water flow is directly led into the drainage open ditches;
(2) The edge of the top plate of the basement is provided with a masonry
In the situation, a blind drain with an edge is not needed to be specially arranged, a drain hole is directly arranged at the root of the masonry wall, a drain pipe is connected to the drain hole, and water flow is led into the drain open drain nearby through the drain pipe;
(3) Shear wall is arranged at edge of top plate of basement
Setting the same edge drainage blind ditch as the situation (1), setting a drainage hole on the shear wall return wall, setting an inverted L-shaped drainage pipe penetrating through the drainage hole at the shear wall from the honeycomb-shaped water permeable pipe side edge in the edge drainage blind ditch, and guiding water flow into the drainage open ditch or the water collecting well of the community rainwater pipe network.
In one embodiment of the foregoing technical solution, the construction step in the step (4) is as follows:
(1) Constructing a waterproof layer according to design requirements;
(2) Constructing a secondary drainage blind ditch and a primary drainage blind ditch according to design requirements;
(3) Pouring a concrete fine stone protective layer in each small area separated by the secondary drainage blind ditch, and setting a slope according to design requirements;
(4) And opening holes at the intersection part of the set first-level drainage blind ditches and arranging drainage ditches or water collecting wells for connecting drainage pipes into the basement bottom plate.
According to the area of the basement roof and the range of the overground building, the invention reasonably divides a large area into a plurality of continuous regular square area units, divides the edge position of the basement roof or the position where the basement roof is connected with the overground building into corner area units with partial peripheral edges automatically formed, sets water-proof and drainage structures around and in the area units, ensures that the water-proof and drainage structures in the area units are communicated with the water-proof and drainage structures around the area units, and the adjacent area units are communicated through the water-proof and drainage structures around the area units, and the square area units adjacent to the water-proof and drainage structures around the corner area units are communicated with the drainage open ditches of the community rainwater pipe network. When the building layer of the waterproof and drainage structure of the basement roof is constructed, the area unit corresponding to the range of the completed basement roof is constructed, and the waterproof and drainage structure of the basement roof is constructed first. The water-proof and drainage structure of the large-area basement roof can be subjected to block construction, the defects in the prior art can be overcome, the construction period can be shortened, and the water-proof and drainage structure is independently designed in a small range, so that the slope gradient can be larger, and the better water-proof and drainage effect can be ensured.
Drawings
Fig. 1 is a schematic plan view of a square area unit drainage structure according to an embodiment of the present invention.
Fig. 2 is an enlarged schematic view of A-A in fig. 1.
Fig. 3 is an enlarged schematic view of B-B in fig. 1.
Fig. 4 is a schematic diagram of a structure of an edge drainage blind drain of a corner area unit in the embodiment.
Fig. 5 is a schematic diagram of an edge drainage blind drain of another corner area unit in the embodiment.
Fig. 6 is a schematic diagram of a structure of an edge drainage blind drain of a third corner area unit in the present embodiment.
Number in the figure:
1-a first-stage drainage blind ditch; 1C, an edge drainage blind ditch;
2-a fine stone concrete waterproof protective layer;
3-secondary drainage blind ditches;
4-basement roof;
5-a waterproof layer;
6-pebbles;
7-geotextile;
8-a honeycomb-shaped water permeable pipe;
9-ramming plain soil;
10-150 thick gravels bedding layer;
11-100 thick C20 reinforced concrete;
12-120 thick C20 plain concrete ditch side walls;
13-50 thick cement mortar;
14-plastering the thick cement mortar on the side wall 20 of the drainage open trench;
15-pre-burying a PVC drain pipe with a horizontal DN 110;
16-prefabricated C20 reinforced concrete cover 500 x 350 x 30;
17-reserving a hole in the brickwork;
an inverted L-shaped PVC drain pipe with an 18-DN 110.
Detailed Description
The invention discloses a water-proof and drainage method of a large-area basement roof, which comprises the following design ideas:
according to the area of the basement roof and the range of the above-ground building, reasonably dividing a large area into a plurality of continuous and regular square area units, and dividing the edge position of the basement roof or the position where the basement roof is connected with the above-ground building into corner area units with partial peripheral edges automatically formed;
then arranging water-proof and drainage structures around each area unit and in the area units, communicating the water-proof and drainage structures around the area units, communicating adjacent area units through the water-proof and drainage structures around the area units, communicating square area units adjacent to the drainage structures around the corner area units and communicating the square area units with drainage open ditches of the community rainwater pipe network;
for better and faster drainage, vertical drainage pipes are arranged at some communication positions of the drainage structures around the adjacent area units to guide water flow into drainage ditches or water collecting wells of the basement bottom plate.
After the design thought is determined, when the building layer of the water-proof and drainage structure of the basement roof is constructed, the construction is carried out on the area unit corresponding to the range of the completed basement roof, and the construction of the water-proof and drainage structure is carried out first when the area unit is seen to come out first. The water-proof and drainage structure of the large-area basement roof can be subjected to block construction, the defects in the prior art can be overcome, the construction period can be shortened, and the water-proof and drainage structure is independently designed in a small range, so that the slope gradient can be larger, and the better water-proof and drainage effect can be ensured.
The following describes in detail the arrangement of the drainage structures of the square area unit and the corner area unit in the present invention, and their specific construction steps, respectively.
As shown in fig. 1, the side length of the square area unit in this embodiment is 24m×24m, the periphery of the square area unit is provided with a primary drainage blind ditch 1, the ditch width of the primary drainage blind ditch is 0.6m, three parallel secondary drainage blind ditches 2 are arranged in the area unit, the ditch width of the secondary drainage blind ditches is 0.6m, the three secondary drainage blind ditches divide the area unit into four rectangular small areas, the short sides of two ends of each small area are symmetrically inclined towards the primary drainage blind ditches and/or the secondary drainage blind ditches at two lateral sides, the long side of each small area faces towards two lateral sides with the central surface in the width direction as a reference, and faces towards two longitudinal ends symmetrically with the central surface in the length direction as a reference, and the specific inclined slope is shown in fig. 1.
As can be seen from fig. 1, the slope of the short sides at the two ends in the unit of the present shape is 2%, the slope of the long side is 2% of the slope of the horizontal slope, and the slope of the vertical slope is 0.69%, and the drainage effect is obviously better than that of the prior art. Therefore, after the area units are divided, the invention not only can shorten the construction period of block construction, but also can improve the drainage effect.
As shown in fig. 2, pebbles included by geotextile are filled in the first-stage drainage blind drain of the present-shaped area unit, and honeycomb-shaped water permeable pipes of DN100 are provided at the bottoms of the pebbles corresponding to the central surfaces of the first-stage drainage blind drain in the width direction. The geotechnical cloth adopts the specification of 150 g/square meter, after the geotechnical cloth is paved in the centering of the first-stage drainage blind ditch, the honeycomb permeable pipe is arranged at the set position on the geotechnical cloth, then pebbles are filled in the geotechnical cloth, the pebbles are in the specification of 30-50mm in particle size, the geotechnical cloth is sewed after the pebbles are filled, the top surface of the finishing pebbles is arc-shaped, the height of the highest position of the arc-shaped is about 200mm, and the top surface of the whole arc-shaped is higher than the ditch wall height of the first-stage drainage blind ditch, so that the better drainage effect of slope surfaces on two sides of the first-stage drainage blind ditch can be ensured.
As shown in fig. 3, the cobble wrapped by geotextile is filled in the secondary drainage blind ditch of the area unit, a permeable pipe is not arranged in the cobble, and the other drainage blind ditches of the same level are arranged.
Since the corner area units are located at the edges of the basement roof or at the locations where the basement roof meets the above-ground building, the shape will generally have regular inner sides adjacent to square area units on the inner side, while the outer sides may be special sides of the shape of a fence at the boundary or of the outer wall of the building.
In the case of dividing the corner area unit, the area is preferably not more than 1000 square meters, so that the size of the square area unit adjacent thereto can be appropriately adjusted.
The corner area units are internally provided with secondary drainage blind ditches according to the square area units, and the periphery of each corner area unit comprises a primary drainage blind ditch shared by the adjacent square area units and an edge drainage blind ditch 1C which is positioned at the edge of the top plate of the basement or is connected with a building.
The arrangement of the drainage structures of the edge drainage blind ditch comprises the following three situations according to the positions of the corner area units:
(1) Basement roof edge does not have brickwork, does not have shear force wall
As shown in fig. 4, the edge drainage blind ditch in this case is arranged in parallel at the side wall of the drainage open ditch of the community rainwater pipe network, and the side wall of the drainage open ditch is provided with a drainage hole, a drainage pipe is arranged in the drainage hole, the water collected in the edge drainage blind ditch is led into the drainage open ditch through the PVC drainage pipe with the embedded horizontal DN110, and the drainage open ditch is positioned outside the top plate of the basement. The interval between the drain holes arranged on the side wall of the open drain is preferably about 500 mm.
The edge drainage blind ditch is arranged at the intersection of the surface of the corner area and the drainage open ditch, the pebbles are wrapped by geotextiles, honeycomb permeable pipes with DN150 are arranged in the pebbles, and the geotextile selection, the pebble size selection and other treatments after the pebbles are wrapped are all referred to the primary drainage blind ditch of the square area unit.
(2) The edge of the top plate of the basement is provided with a masonry
As shown in fig. 5, the masonry adopts 240×190×90 shale porous bricks (the holes are plugged by mortar), so that the situation is that the edge drainage blind ditch is not needed to be arranged, the drainage holes are directly arranged on the masonry wall, a hole is reserved on the masonry wall at a distance of about 500mm for drainage with the outdoor, and the size of the hole is 200×100 as thick as the wall. The opening is closely connected with the drainage ditch through the drainage pipe, and the drainage is organized.
(3) Shear wall is arranged at edge of top plate of basement
The arrangement of the edge drainage blind drain in this case is basically the same as that of the (1) case, but the drain pipe adopts an inverted-L-shaped PVC drain pipe of DN110, and the horizontal section of the inverted-L-shaped PVC drain pipe is inserted into the side wall of the honeycomb-shaped water permeable pipe in the edge drainage blind drain. When the shear wall is built, the drain pipes are embedded in the return wall at a distance of about 15m, and are closely connected into drainage ditches and wells for organized discharge.
The construction of the water-proof and drainage structure of the basement roof is carried out after concrete is poured and maintained on the basement roof, the construction sequence is determined according to the corresponding area units of the completed basement roof, and the basement roof is subjected to the water-proof and drainage construction of the corresponding area units.
The construction steps for the square area unit of design division are as follows:
(1) Constructing a waterproof layer in the square area unit according to the design requirement;
(2) Constructing a secondary drainage blind ditch and a primary drainage blind ditch in the square area unit according to the design requirements;
(3) And casting a concrete fine stone protective layer in the square area unit, and setting down a slope according to the design requirement.
(4) According to the design requirement, holes are formed at the intersection of the set first-level drainage blind ditches, and a vertical drainage pipe is arranged to guide water into the drainage ditches or the water collecting wells of the basement bottom plate.
The construction steps for the corner area units of the design division are as follows:
(1) Constructing a waterproof layer in the corner area unit according to the design requirement;
(2) Constructing a secondary drainage blind ditch and an edge drainage blind ditch in the corner area unit according to the design requirements;
(3) And casting a concrete fine stone protective layer in the corner area unit, and setting down the slope according to the design requirement.
(4) And installing a drain pipe according to the design requirements.
Claims (4)
1. A water-proof and drainage method for a large-area basement roof comprises the following steps:
(1) Dividing the whole area design of the basement roof into a plurality of continuous square area units and corner area units at the periphery of the square area units according to the area of the basement roof and the range of the above-ground building;
(2) Carrying out waterproof and drainage structure design on each square area unit, and simultaneously enabling drainage structures between adjacent square area units to be communicated;
(3) Designing a waterproof and drainage structure of each corner area unit, and simultaneously communicating the corner area units with the drainage structures of adjacent square area units and the drainage open channels of the community rainwater pipe network;
(4) Performing waterproof and drainage structure construction on the area units corresponding to the range of the completed basement roof;
the water-proof drainage structure of the square area unit comprises first-stage drainage blind ditches around the square area unit and N second-stage drainage blind ditches which are arranged in parallel in the square area unit, the square area unit is divided into N+1 rectangular small areas through the second-stage drainage blind ditches, and two ends of each second-stage drainage blind ditch are respectively communicated with the first-stage drainage blind ditches on the corresponding sides;
the waterproof and drainage structure of the corner area unit comprises a first-stage drainage blind ditch and/or an edge drainage blind ditch at the periphery of the corner area unit, a plurality of second-stage drainage blind ditches in the unit, wherein the first-stage drainage blind ditches and/or the edge drainage blind ditches are communicated with drainage open ditches of a community rainwater pipe network, the first-stage drainage open ditches of the corner area unit are communicated with the first-stage drainage blind ditches of adjacent square area units, and two ends of the second-stage drainage blind ditches are respectively communicated with the first-stage drainage blind ditches and/or the edge drainage blind ditches at corresponding sides;
slope finding is carried out by 0.5% from the middle position to two sides at the bottom of the first-stage drainage blind ditch, geotextile is filled in the ditch to wrap pebbles, honeycomb-shaped water permeable pipes are arranged in the pebbles, and the top surface formed by wrapping the pebbles by the geotextile is an arc surface higher than slope surfaces at two sides;
the secondary drainage blind ditches are uniformly distributed in parallel in each area unit, the bottoms of the secondary drainage blind ditches are located at the middle position to the two sides for slope finding by 0.5%, pebbles wrapped by geotextiles are filled in the ditches, and the top surfaces formed by the pebbles wrapped by the geotextiles are arc surfaces higher than slope surfaces of the two sides;
and the two ends of the short sides of the building layer between the first-stage drainage blind ditches and/or between the edge drainage blind ditches and the adjacent second-stage drainage blind ditches in the square unit area and the corner area unit are provided with 2% -3% of slopes from the middle to the two sides, 0.5% -1% of slopes are provided for the first-stage drainage blind ditches and/or the edge drainage blind ditches, 2% -3% of slopes are provided for the second-stage drainage blind ditches symmetrically by taking the central plane of the width direction of the building layer as a reference, and 0.5% -1% of slopes are provided for the two ends by taking the central plane of the length direction as a reference.
2. The method for preventing and draining water of a large area basement roof according to claim 1, wherein: the intersection of one-level drainage blind ditch sets up vertical drain pipe, in leading rivers to the water collecting structure of basement bottom plate through the drain pipe.
3. The method for preventing and draining water of a large area basement roof according to claim 1, wherein: the arrangement and structure of the edge drainage blind ditches of the corner area units comprise the following three situations:
(1) Basement roof edge does not have brickwork, does not have shear force wall
The edge drainage blind ditches of the corner area units are arranged in parallel with the drainage open ditches of the district rainwater pipe network and are communicated with the drainage open ditches through drainage pipes, and water flow is directly led into the drainage open ditches;
(2) The edge of the top plate of the basement is provided with a masonry
In the situation, a blind drain with an edge is not needed to be specially arranged, a drain hole is directly arranged at the root of the masonry wall, a drain pipe is connected to the drain hole, and water flow is led into the drain open drain nearby through the drain pipe;
(3) Shear wall is arranged at edge of top plate of basement
Setting the same edge drainage blind ditch as the situation (1), setting a drainage hole on the shear wall return wall, setting an inverted L-shaped drainage pipe penetrating through the drainage hole at the shear wall from the honeycomb-shaped water permeable pipe side edge in the edge drainage blind ditch, and guiding water flow into the drainage open ditch or the water collecting well of the community rainwater pipe network.
4. A method of preventing and draining a large area basement roof as claimed in claim 3, wherein: the construction steps in the step (4) are as follows:
(1) Constructing a waterproof layer according to design requirements;
(2) Constructing a secondary drainage blind ditch and a primary drainage blind ditch according to design requirements;
(3) Pouring a concrete fine stone protective layer in each small area separated by the secondary drainage blind ditch, and setting a slope according to design requirements;
(4) And opening holes at the intersection part of the set first-level drainage blind ditches and arranging drainage ditches or water collecting wells for connecting drainage pipes into the basement bottom plate.
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| CN112861209A (en) * | 2021-01-08 | 2021-05-28 | 珠海新势力创建筑设计有限公司 | Automatic pressure wastewater pipeline generation device based on basement piping lane and sump pit |
| CN113638559A (en) * | 2021-09-06 | 2021-11-12 | 上海市政工程设计研究总院（集团）有限公司 | Top cover rainwater drainage system of semi-underground sewage treatment plant and sewage treatment plant |
| CN114855963A (en) * | 2022-04-26 | 2022-08-05 | 上海宝冶集团有限公司 | Basement roof drainage system and construction process |
| CN115506360B (en) * | 2022-10-19 | 2024-01-23 | 中国建筑第八工程局有限公司 | Backfilling method for reducing subsidence of fertilizer tank in basement |
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