CN113445552A - Construction method for spraying concrete between fender piles and using concrete as waterproof base surface - Google Patents
Construction method for spraying concrete between fender piles and using concrete as waterproof base surface Download PDFInfo
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- CN113445552A CN113445552A CN202110887486.5A CN202110887486A CN113445552A CN 113445552 A CN113445552 A CN 113445552A CN 202110887486 A CN202110887486 A CN 202110887486A CN 113445552 A CN113445552 A CN 113445552A
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- 239000004567 concrete Substances 0.000 title claims abstract description 89
- 238000005507 spraying Methods 0.000 title claims abstract description 57
- 238000010276 construction Methods 0.000 title claims abstract description 34
- 239000011378 shotcrete Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000004575 stone Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 6
- 239000004576 sand Substances 0.000 claims abstract description 6
- 238000013461 design Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 238000007790 scraping Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 11
- 239000000853 adhesive Substances 0.000 abstract description 4
- 238000005096 rolling process Methods 0.000 abstract description 4
- 239000004570 mortar (masonry) Substances 0.000 abstract description 3
- 238000005498 polishing Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000010410 layer Substances 0.000 description 6
- 239000011083 cement mortar Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The invention provides a construction method for spraying concrete among fender piles and using the concrete as a waterproof base surface, which comprises the following steps: manually repairing the earthwork between the enclosure piles, and inserting a drainage conduit at the water seepage point of the earthwork between the enclosure piles; mixing concrete, adding an accelerator into the concrete, wherein the concrete comprises the following components in parts by mass: medium sand: crushing stone: water: rapid setting is 1:2.39:1.59:0.44: 0.06; primarily spraying concrete with the thickness of 5 cm-10 cm on the surface of the earthwork between the enclosure piles; after the primary sprayed concrete is finally set, hanging a reinforcing mesh and spraying concrete again, and before the secondary sprayed concrete is finally set, primarily finishing the guniting surface of the secondary sprayed concrete, and press-polishing and rolling the finished guniting surface; the flatness of the detected guniting surface meets the flatness requirement of a waterproof base surface used for hanging the waterproof roll. The invention adjusts the mixing proportion of the sprayed concrete and presses the polished surface in time after the spraying is finished, thereby improving the flatness of the sprayed surface to enable the sprayed surface to be directly hung with the self-adhesive waterproof coiled material, saving the secondary mortar process and reducing the cost.
Description
Technical Field
The invention relates to the technical field of waterproof base surface construction, in particular to a construction method for spraying concrete between enclosure piles and using the concrete as a waterproof base surface.
Background
The open cut subway station is influenced by underground water of a deep foundation pit, has high construction risk and high waterproof quality requirement, ensures no seepage and no leakage, and is the key point for controlling the subway construction quality. The waterproof layer wrapped outside the subway station structure adopts a non-asphalt high-polymer self-adhesive film waterproof coiled material, and the base surface of the coiled material is required to be clean, flat and solid and is free from the phenomena of looseness, sanding and peeling.
However, in the spray mixing construction process among the deep foundation pit retaining piles of the station, in the actual construction process, the net spraying surface is generally rough and has poor surface flatness, the flatness requirement of a waterproof base surface cannot be met, in order to meet the flatness requirement of the waterproof base surface, a temporary scaffold needs to be set up to carry out secondary mortar plastering and leveling treatment, and the method is time-consuming and labor-consuming and has potential safety hazards.
Therefore, the construction method for spraying concrete between the enclosure piles and using the concrete as the waterproof base surface is continuously provided, the waste caused by the falling of the concrete can be reduced, the cement mortar plastering procedure is omitted, the treatment requirement of the waterproof base surface is met at one time, and the quality guarantee is provided for field production.
Disclosure of Invention
The invention aims to overcome the technical defects and provides a construction method for spraying concrete between enclosure piles and using the concrete as a waterproof base surface, which can reduce the waste of concrete caused by falling and save a cement mortar plastering process and can meet the requirement of processing the waterproof base surface at one time.
The technical scheme for realizing the purpose is as follows:
the invention provides a construction method for spraying concrete among fender piles and using the concrete as a waterproof base surface, which comprises the following steps:
carrying out manual face repairing on earthwork between the enclosure piles, and inserting a drainage catheter at a water seepage point of the earthwork between the enclosure piles, wherein the length of the drainage catheter is greater than the design height of a waterproof base surface;
mixing concrete, adding an accelerator into the concrete, and controlling the mass mixing ratio of the concrete as cement: medium sand: crushing stone: water: the accelerator is 1:2.39:1.59:0.44: 0.06;
primarily spraying the concrete on the surface of the earthwork between the enclosure piles, and controlling the thickness of the primarily sprayed concrete to be 5-10 cm;
after the primarily sprayed concrete is finally set, hanging a reinforcing mesh and spraying the concrete again, and before the secondarily sprayed concrete is finally set, primarily finishing the sprayed surface of the secondarily sprayed concrete, scraping the convex part of the sprayed surface, and press-finishing the finished sprayed surface;
and detecting the flatness of the guniting surface to ensure that the guniting surface meets the flatness requirement of a waterproof base surface for hanging the waterproof roll.
The construction method of spraying concrete between the enclosure piles and serving as a waterproof base surface is further improved in that when manual repair is carried out on earthwork between the enclosure piles, the construction method further comprises the following steps:
and (5) checking the position range of the fender post at the position of the concrete to be sprayed, and chiseling out the fender post position of the inclined limiting main body structure.
The construction method of the invention has the further improvement that the crushed stone has the particle size of 5 mm-10 mm.
The construction method for spraying concrete among the enclosure piles and serving as the waterproof base surface is further improved in that when the concrete is re-sprayed to a distance of 2 cm-3 cm from the shotcrete surface, the mass mixing ratio of the concrete is adjusted, the using amount of the broken stones is reduced, and the re-spraying of the adjusted concrete is completed.
The construction method of the invention for spraying concrete between the enclosure piles and also serving as a waterproof base surface is further improved in that after the flatness of the shotcrete surface is detected, the construction method further comprises the following steps:
and cutting off the part of the drainage catheter higher than the guniting surface and plugging the drainage catheter by taking the guniting surface as a waterproof base surface, and directly hanging a waterproof coiled material on the guniting surface.
The construction method of spraying concrete between the enclosure piles and serving as the waterproof base surface has the advantages that:
the drainage guide pipe is inserted into a water seepage point of earthwork between the enclosure piles, the accelerating agent is added into the concrete to adjust the mix proportion of the concrete, the concrete solidification time is shortened, the self cohesive force of the concrete is increased, and a grout spraying surface with higher integrity is formed, so that the problem that the surface of the grout spraying layer is pulled to crack due to the water seepage of underground water at the water seepage point is solved. Through press polishing and surface rolling of the corrected spraying surface and detection of the flatness of the spraying surface, the spraying surface can be directly used as a waterproof base surface for hanging the self-adhesive waterproof roll, so that the processing requirement of the waterproof base surface is met at one time, the cement mortar plastering process is omitted, and the process and the cost are saved.
Further, when the concrete is sprayed to the final surface layer within the range of 2-3 cm, the mixing proportion of the concrete is adjusted, the using amount of crushed stones with the particle size of 5-10 mm is reduced, the subsequent construction of press finishing and surface folding is facilitated, the construction quality is further guaranteed, and the construction cost is reduced.
Drawings
FIG. 1 is a flow chart showing steps of the construction method of the invention for spraying concrete between the fender piles and using the sprayed concrete as a waterproof base.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Referring to fig. 1, the present invention provides a construction method for spraying concrete and using the concrete as a waterproof base surface between fender piles, which includes:
step S1: and (3) carrying out manual face repairing on earthwork between the enclosure piles, inserting a drainage catheter at a water seepage point of the earthwork between the enclosure piles, wherein the length of the drainage catheter is greater than the design height of the waterproof base surface.
In this embodiment, before the concrete is sprayed, the surface to be subjected to the shotcrete needs to be manually repaired, specifically, after the excavation of the foundation pit is completed by using the excavator, the excess earthwork is manually removed and loose mud blocks and impurities between the enclosure piles are removed, preferably, when the earthwork between the enclosure piles is manually repaired, the position range of the enclosure pile of the part to be subjected to the shotcrete is checked, and the part of the enclosure pile of the inclined limit main structure is chiseled.
Specifically, the total station can be used for measuring and checking the position range of the fender post at the guniting position, whether the phenomenon of invading the limit main body structure exists or not, if the phenomenon exists, the invasion line is dug out in advance under the condition of meeting the supporting effect, and the guniting leveling is carried out on the chiseled-out position in the subsequent shotcrete construction. For the leakage phenomenon of the soil between the local enclosing piles, in order to avoid the influence of water seepage on the sprayed concrete, the base surface can not be bonded, and even the subsequent tension crack of the sprayed surface is caused by the impact of the underground water of a leakage point, a drainage guide pipe needs to be inserted into the leakage point, the length of the drainage guide pipe exceeds the thickness of the sprayed concrete, after the drainage guide pipe is inserted, the periphery of the drainage guide pipe is plugged by adopting plugging materials, and then the concrete spraying operation is carried out.
Step S2: mixing concrete, adding an accelerator into the concrete, and controlling the mixing ratio of the concrete as cement: medium sand: crushing stone: water: the accelerator is 1:2.39:1.59:0.44: 0.06.
In this embodiment, the mix proportion of the shotcrete is determined by laboratory trial, and the determined mix proportion of the shotcrete is cement: medium sand: crushing stone: water: and (3) quickly setting to 1:2.39:1.59:0.44:0.06, sampling on site, manufacturing a test piece, and testing the strength. Preferably, the particle size of the crushed stone in the embodiment is 5 mm-10 mm, compared with the existing common mixing ratio, the embodiment properly increases the sand usage amount in the fine aggregate in the mixing ratio, and reduces the usage amount of the coarse aggregate crushed stone, thereby reducing the self weight of the concrete after guniting, preventing the pulling crack and falling caused by the self weight action of the guniting layer, and in addition, when the guniting surface between the enclosure piles has the water leakage phenomenon, properly increases the accelerating agent when the concrete is mixed, the accelerating agent can adopt the existing products such as the leakage stoppage king and the like, the concrete solidification time can be shortened, the self cohesive force of the concrete is increased, the cohesive effect of the water seepage base surface guniting is enhanced, the guniting surface with higher integrity is convenient to form, and the water leakage phenomenon on the surface of the concrete is reduced.
Step S3: and primarily spraying concrete on the surface of the earthwork between the enclosure piles, wherein the thickness of the primarily sprayed concrete is controlled to be 5 cm-10 cm.
Step S4: after the primary sprayed concrete is finally set, hanging a reinforcing mesh and spraying the concrete again, before the secondary sprayed concrete is finally set, primarily finishing the guniting surface of the secondary sprayed concrete, scraping the convex part of the guniting surface, and press-polishing and rolling the finished guniting surface.
In this embodiment, the shotcrete is sprayed in the first stage and the second stage. And in the stage of primary concrete spraying, measuring and lofting the thickness range of sprayed concrete and controlling a stay wire, wherein the sprayed thickness is controlled to be 5-10 cm each time during spraying, and the next layer is sprayed immediately after the previous layer is finally set, so that the sprayed layer is prevented from falling off due to overlarge dead weight caused by over-thick concrete during concrete spraying, and in addition, the primary spraying is firstly carried out on the overexcavation part between the enclosure piles, so that the hanging surface of the reinforcing mesh between the subsequent enclosure piles is ensured to be flat. When in spraying, the spraying is started from the bottom surface to the top, the spraying gun is perpendicular to the sprayed surface as much as possible, the spraying angle at the higher part of the top of the side wall is controlled to be 60-90 degrees (the perpendicular sprayed surface is 90 degrees), the distance is controlled to be 0.6-1.2 m, and the air volume and the air pressure are adjusted according to the rebounding condition of the spraying in the spraying process. After the initial spraying is finished, holes need to be drilled in the fender pile and expansion bolts need to be implanted, so that the net can be hung, specifically, the expansion bolts are arranged according to the requirement of the distance between the expansion bolts in the design requirement, the expansion bolts are driven into the central position of the front face of the fender pile by a handheld electric drill, the driving depth cannot be smaller than 10cm, the steel bar net piece is firmly hooked with the expansion bolts in the process of installation, and the specific size and the layout distance of the expansion bolts also need to meet the requirement of the designed layout distance.
In this embodiment, the reinforcing mesh is made of
The steel bar coils are welded, the space between the grids is 150mm, the height is 150mm, and when the steel bar mesh is hung, the space between the steel bar mesh and the wall surface of the primary sprayed concrete is ensuredThe gap is 30 mm; the length of the lap joint between the two steel bar meshes is required to be not less than 200mm, and the two steel bar meshes are connected by spot welding; the mesh ribs on each working surface are reserved for the length of lap joint with the mesh ribs on the next working surface.
In order to ensure that the thickness of the re-sprayed concrete is effectively controlled, in the embodiment, the method adopts
And the short reinforcing steel bar heads are placed in soil bodies among the enclosing piles for spraying concrete thickness control, the transverse spacing of the reinforcing steel bar heads is consistent with the spacing of the enclosing piles, and the vertical spacing is 1.0 m. And controlling the exposed length of the steel bar heads to be the guniting thickness, controlling the guniting thickness under the conditions of ensuring the clearance of the main structure and ensuring the thickness of the side wall to meet the design requirement, carrying out hanging line inspection, and controlling the thickness of sprayed concrete by strictly referring to the exposed length of the steel bar heads in the re-spraying process.
In this embodiment, the concrete is re-sprayed on the side wall of the enclosure structure at the re-spraying stage according to the construction process at the initial spraying stage, and the re-spraying thickness is strictly controlled according to the finished steel bar head marks, so as to ensure that the concrete surface is flat and solid.
As a preferred embodiment of the construction method for spraying concrete between the enclosure piles and serving as a waterproof base surface, when the concrete is sprayed to a distance of 2-3 cm from the shotcrete surface, the mixing proportion of the concrete is adjusted, so that the adjusted concrete is subjected to re-spraying, the using amount of crushed stones with the particle size of 5-10 mm is reduced, and particularly, in the embodiment, the using amount of the melon-rice stones is appropriately reduced, the flatness of the shotcrete surface is improved, and therefore subsequent surface collection construction is facilitated.
In the embodiment, after the concrete is sprayed, after the concrete is initially set and before the concrete is finally set, the initial setting time of the sprayed concrete is 5min, the final setting time is 10min, a long guiding rule is adopted to initially trim the concrete surface, and the convex part of the concrete surface is scraped; and then, calendering and rolling the finished concrete surface by using a lime cutter so as to level the sprayed concrete surface. Of course, in other embodiments, other straight rods may be used to scrape off the convex portions of the concrete surface, or other troweling members may be used to trim the concrete surface after finishing, which is not described herein.
Step S5: and the flatness of the guniting surface is detected, so that the guniting surface is ensured to meet the flatness requirement of a waterproof base surface used as a hanging self-adhesive waterproof coiled material.
In this embodiment, specifically, after the face is closed, the flatness of the concrete face may be detected by using the long guiding rule, and specifically, the flatness of the waterproof base face should satisfy D/L ≤ 1/20, where D is the maximum depth between adjacent convex faces, and L is the minimum distance between adjacent convex faces.
As a preferred embodiment of the construction method of the invention, after detecting the flatness of the shotcrete surface, the method further includes the step S6: the spraying surface is used as a waterproof base surface, the part of the drainage conduit, which is higher than the spraying surface, is cut flat and is blocked, and the self-adhesive waterproof coiled material is directly hung on the spraying surface, so that the secondary mortar leveling step is not needed, and the process and the cost are saved.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (5)
1. A construction method for spraying concrete between enclosure piles and using the concrete as a waterproof base surface is characterized by comprising the following steps:
carrying out manual face repairing on earthwork between the enclosure piles, and inserting a drainage catheter at a water seepage point of the earthwork between the enclosure piles, wherein the length of the drainage catheter is greater than the design height of a waterproof base surface;
mixing concrete, adding an accelerator into the concrete, and controlling the mass mixing ratio of the concrete as cement: medium sand: crushing stone: water: the accelerator is 1:2.39:1.59:0.44: 0.06;
primarily spraying the concrete on the surface of the earthwork between the enclosure piles, and controlling the thickness of the primarily sprayed concrete to be 5-10 cm;
after the primarily sprayed concrete is finally set, hanging a reinforcing mesh and spraying the concrete again, and before the secondarily sprayed concrete is finally set, primarily finishing the sprayed surface of the secondarily sprayed concrete, scraping the convex part of the sprayed surface, and press-finishing the finished sprayed surface;
and detecting the flatness of the guniting surface to ensure that the guniting surface meets the flatness requirement of serving as a waterproof base surface.
2. The construction method of the space enclosing piles by spraying concrete and serving as a waterproof base surface according to claim 1, further comprising the following steps of when the earthwork between the space enclosing piles is manually repaired:
and (5) checking the position range of the fender post at the position of the concrete to be sprayed, and chiseling out the fender post position of the inclined limiting main body structure.
3. The construction method of the space enclosing piles by spraying concrete and serving as a waterproof base surface according to claim 1, wherein the crushed stone has a particle size of 5mm to 10 mm.
4. The construction method of the space enclosing piles for spraying concrete and serving as a waterproof base surface according to claim 1, wherein when the concrete is re-sprayed to a distance of 2cm to 3cm from the shotcrete surface, the mass mixing ratio of the concrete is adjusted, the amount of the broken stones is reduced, and the re-spraying of the adjusted concrete is completed.
5. The construction method of the space enclosing piles for spraying concrete and serving as a waterproof base surface according to claim 1, wherein after the flatness of the shotcrete surface is detected, the method further comprises the following steps:
and cutting off the part of the drainage catheter with the length larger than the waterproof base surface and plugging the drainage catheter by taking the guniting surface as the waterproof base surface, and directly hanging a waterproof coiled material on the guniting surface.
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| CN202110887486.5A CN113445552A (en) | 2021-08-03 | 2021-08-03 | Construction method for spraying concrete between fender piles and using concrete as waterproof base surface |
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| CN202110887486.5A CN113445552A (en) | 2021-08-03 | 2021-08-03 | Construction method for spraying concrete between fender piles and using concrete as waterproof base surface |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201883450U (en) * | 2010-11-25 | 2011-06-29 | 中国京冶工程技术有限公司 | Coastal deep-foundation anti-seepage waterproof basement structure |
| KR101385829B1 (en) * | 2013-03-20 | 2014-04-16 | 신계호 | Construction method of multicoating waterproof layer using ployurea |
| CN109384439A (en) * | 2018-11-29 | 2019-02-26 | 长安大学 | The high-strength fast gravity die gunite concrete of one kind and soft rock tunnel country rock closed reinforcing method |
| CN109626914A (en) * | 2019-01-31 | 2019-04-16 | 青岛市地铁号线有限公司 | A kind of material and preparation method of hard rock tunnel water proof type single shell lining |
| CN110172978A (en) * | 2019-06-21 | 2019-08-27 | 中铁上海工程局集团有限公司 | A kind of subway open-cut station waterproof basal plane construction method |
-
2021
- 2021-08-03 CN CN202110887486.5A patent/CN113445552A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201883450U (en) * | 2010-11-25 | 2011-06-29 | 中国京冶工程技术有限公司 | Coastal deep-foundation anti-seepage waterproof basement structure |
| KR101385829B1 (en) * | 2013-03-20 | 2014-04-16 | 신계호 | Construction method of multicoating waterproof layer using ployurea |
| CN109384439A (en) * | 2018-11-29 | 2019-02-26 | 长安大学 | The high-strength fast gravity die gunite concrete of one kind and soft rock tunnel country rock closed reinforcing method |
| CN109626914A (en) * | 2019-01-31 | 2019-04-16 | 青岛市地铁号线有限公司 | A kind of material and preparation method of hard rock tunnel water proof type single shell lining |
| CN110172978A (en) * | 2019-06-21 | 2019-08-27 | 中铁上海工程局集团有限公司 | A kind of subway open-cut station waterproof basal plane construction method |
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