CN104929143B - A kind of bottom of foundation ditch dewatering well shut-in well method - Google Patents
A kind of bottom of foundation ditch dewatering well shut-in well method Download PDFInfo
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- CN104929143B CN104929143B CN201510200692.9A CN201510200692A CN104929143B CN 104929143 B CN104929143 B CN 104929143B CN 201510200692 A CN201510200692 A CN 201510200692A CN 104929143 B CN104929143 B CN 104929143B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 38
- 239000010959 steel Substances 0.000 claims abstract description 38
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 238000005086 pumping Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims description 11
- 239000004568 cement Substances 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 239000008233 hard water Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 3
- 210000002435 tendon Anatomy 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 6
- 239000004575 stone Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
一种基坑底部降水井封井方法，包括：对需要封井的降水井进行抽水试验；测量井深；在降水井管（５）上套上带止水翼（７）的钢管（８）；将基坑底部的防水板（４）满焊到钢管上；大容量抽水或置入滤水箱（11）抽水；填入填充料并夯实；将钢板满焊到钢管止水翼上；连接底板内缘受力筋，灌注混凝土密封。采用本发明提供的基坑底部降水井封井方法，克服了基坑施工中封井技术不完善的缺点，针对基坑工程中各种降水井的具体情况，提出封井方案，操作步骤明确，简便经济，具有很好的推广应用价值。
A method for closing a dewatering well at the bottom of a foundation pit, comprising: performing a pumping test on a dewatering well that needs to be closed; measuring the depth of the well; and putting a steel pipe (8) with a water stop fin (7) on the dewatering well pipe (5); Fully weld the waterproof plate (4) at the bottom of the foundation pit to the steel pipe; pump water with a large capacity or put it into the filter water tank (11) to pump water; fill in the filling material and compact it; fully weld the steel plate to the steel pipe water stop wing; connect the bottom plate Edge stress tendons are filled with concrete for sealing. Adopting the sealing method of the dewatering well at the bottom of the foundation pit provided by the present invention overcomes the shortcomings of the imperfect sealing technology in the construction of the foundation pit, and proposes a well sealing scheme for the specific conditions of various dewatering wells in the foundation pit engineering, and the operation steps are clear. It is simple and economical, and has good promotion and application value.
Description
技术领域technical field
本发明涉及一种基坑底部降水井封井方法，属土木工程施工技术领域。The invention relates to a well sealing method for a dewatering well at the bottom of a foundation pit, belonging to the technical field of civil engineering construction.
背景技术Background technique
随着经济的快速发展，各种大型建筑日益增多，深基坑也越来越普遍，而深基坑降水井的封堵，常常成为整个施工的关键环节，它直接影响到工程的防水和后续施工能否顺利进行。但对于此方面的施工，国家行业都没有设定相关规范，各建设单位只能依据经验自行封堵。With the rapid development of the economy, various large-scale buildings are increasing, and deep foundation pits are becoming more and more common, and the sealing of deep foundation pit dewatering wells often becomes a key link in the entire construction, which directly affects the waterproofing and follow-up of the project. Whether the construction can proceed smoothly. However, for this aspect of construction, the national industry has not set relevant regulations, and each construction unit can only block it by itself based on experience.
目前，大多数建设单位采取的通常是，当基坑开挖完成，进行底板施工时，先对降水井进行大量排水，然后利用水位回升的空隙时间，在降水井中填入水泥、砂子、碎石等混合干料，边填入边进行夯实，最后安放钢井盖，与井管焊死。这样的做法，能解决一部分基坑的封井问题，但对于降水井出水量较大时或施工要求严格的情况下，往往出现，封井工作不能一次完成，常常需要将水泵一并封入井中。At present, most construction units usually adopt the method that when the excavation of the foundation pit is completed and the floor construction is carried out, a large amount of drainage is first performed on the dewatering well, and then the dewatering well is filled with cement, sand, and gravel by using the gap time when the water level rises. Wait until the dry material is mixed, tamp it while filling it in, and finally place the steel manhole cover and weld it to the well pipe. This method can solve the problem of sealing part of the foundation pit, but when the water output of the dewatering well is large or the construction requirements are strict, it often happens that the well sealing work cannot be completed at one time, and the water pump is often required to be sealed into the well.
综上所述，目前已有的基坑底部降水井封井技术并不完善，存在封井施工操作不能一次成功且常常需要弃泵的缺点。To sum up, the current sealing technology of the dewatering well at the bottom of the foundation pit is not perfect, and there are disadvantages that the sealing operation cannot be successful at one time and often requires the abandonment of the pump.
发明内容Contents of the invention
本发明的目的是，针对上述现有技术存在的问题，本发明提供一种基坑底部降水井封井方法。The object of the present invention is to provide a method for sealing a dewatering well at the bottom of a foundation pit in view of the problems in the prior art described above.
本发明的技术方案是，The technical scheme of the present invention is,
（１）清理基坑基底面，铺设找平层，在降水井管外套上钢管，在钢管顶端外沿满焊一圈钢板作为止水翼，将基坑底部的防水板满焊焊接到钢管表面，将井孔处的内缘受力筋先断开并弯起，预留封井的空间，浇筑底板混凝土并振捣密实；(1) Clean the base of the foundation pit, lay a leveling layer, put a steel pipe on the jacket of the dewatering well pipe, weld a circle of steel plates on the outer edge of the top of the steel pipe as a water stop, and weld the waterproof plate at the bottom of the foundation pit to the surface of the steel pipe. Disconnect and bend the inner edge of the well hole first to reserve a space for sealing the well, pour concrete on the bottom plate and vibrate it tightly;
（２）对需要封口的降水井进行抽水试验，确定出水量的大小：(2) Conduct a pumping test on the precipitation wells that need to be sealed to determine the water output:
（３）测量降水井的井深，确定回填材料用量；(3) Measure the depth of the dewatering well and determine the amount of backfill material;
（４）大容量抽水，抽水完成后，提出抽水泵，迅速填入事先准备好的填充料，或置入滤水箱，连接水泵不停抽水，降水井内水位降到最低时，迅速填入事先准备好的填充料；(4) Large-capacity pumping. After the pumping is completed, take out the pump and quickly fill in the pre-prepared filler, or put it in the filter tank and connect the pump to pump water continuously. When the water level in the dewatering well drops to the lowest level, quickly fill in the pre-prepared good filler;
（５）夯实填充料，填筑至井口，封闭井口，将钢板满焊焊接到止水翼上密封，连接底板内缘受力筋，灌注微膨胀混凝土。(5) Tamp the filling material, fill it to the wellhead, close the wellhead, weld the steel plate to the water stop wing for sealing, connect the inner edge of the bottom plate to the stress rib, and pour the micro-expansion concrete.
在PVC降水井管外套上厚为5mm的钢管，钢管顶端距离基础混凝土顶面10cm，将铺设到降水井边的防水板满焊焊接到钢管表面，并在焊缝周围涂上止水腻子；在钢管顶端外沿的位置，以满焊的方式焊上一圈钢板作为止水翼，止水翼钢板宽20cm，厚为5mm；铺设防水板保护层和底板钢筋。A steel pipe with a thickness of 5mm is placed on the PVC dewatering well pipe jacket, and the top of the steel pipe is 10cm away from the top surface of the foundation concrete. The waterproof plate laid on the side of the dewatering well is fully welded to the surface of the steel pipe, and water-stop putty is applied around the weld; At the position of the outer edge of the top of the steel pipe, a circle of steel plates is welded in a full welding manner as a water-stop foil. The water-stop steel plate is 20cm wide and 5mm thick; the waterproof plate protection layer and the bottom plate reinforcement are laid.
当井内水全部抽空以后，停止抽水，水位恢复到坑底标高时需要10分钟以上的，定为小出水量井；当井内水全部抽空以后，停止抽水，水位恢复到坑底标高时历时低于3分钟的，定为大出水量井；当井内水全部抽空以后，停止抽水，水位恢复到坑底标高时历时介于3到10分钟之间的，定为中等出水量井。When all the water in the well is evacuated, stop pumping, and it takes more than 10 minutes for the water level to return to the pit bottom elevation, it is defined as a small water output well; Wells with a large water output within 3 minutes are defined as wells with a large water output; when the water in the well is completely evacuated, the pumping is stopped, and the water level returns to the bottom elevation after 3 to 10 minutes, it is defined as a well with a medium water output.
因降水井长期运转，有的井内有少量泥沙淤积或杂物回落到井中，所以封井前对每个井进行测量，确定井深，并根据实测井深计算每个井的回填用材料量，回填材料用量体积，其中r为降水井半径，h是实测井深。Due to the long-term operation of the dewatering well, some wells have a small amount of sediment or debris falling back into the well. Therefore, before closing the well, measure each well to determine the well depth, and calculate the amount of backfill material for each well according to the measured well depth. Backfill material usage volume , where r is the radius of the precipitation well, and h is the measured well depth.
对于小出水量井，准备好回填所需量的C15混凝土，然后截断井管，大容量抽水，待抽水完成，快速提出抽水泵，迅速向井管内填入C15混凝土，并封闭井口。最后焊接封闭钢板，满焊密封。连接底板内缘受力筋，灌注混凝土（微膨胀）。For wells with small water output, prepare the required amount of C15 concrete for backfilling, then cut off the well pipe, and pump water in large capacity. Finally, the closed steel plate is welded and fully welded and sealed. Connect the reinforcement on the inner edge of the bottom plate and pour concrete (micro-expansion).
对于中等出水量井，将定量的砂子、水泥、碎石干料按2：2：1的比例在井口旁搅拌均匀，然后截断井管，大容量抽水，待抽水完成，快速提出水泵，迅速向井内投放混合料，边投放边夯实，填筑完成后，封闭井口。最后焊接封闭钢板，满焊密封。连接底板内缘受力筋，灌注混凝土（微膨胀）。For wells with medium water output, mix quantitative sand, cement, and gravel dry materials in a ratio of 2:2:1 beside the wellhead, then cut off the well pipe, and pump water with a large capacity. Put the mixture inside, and tamp it while putting it in. After the filling is completed, close the wellhead. Finally, the closed steel plate is welded and fully welded and sealed. Connect the reinforcement on the inner edge of the bottom plate and pour concrete (micro-expansion).
对于大出水量井，需在填筑的过程中，连续不断的抽水，对于此，本发明提出的方案是，设置边长为20cm的正方体滤水箱，壁厚3mm，可采用塑胶或钢材制作，滤水箱中插入硬质塑料管，塑料管的直径大于3cm，塑料管在距离井口50cm的位置设置阀门，外接水泵进水口；所料将定量的砂子、水泥、碎石干料按2：2：1的比例，掺入水玻璃或其他速凝剂，在井口旁搅拌均匀；大容量抽水，水位降到滤水箱顶端时，投放混合料，边投边夯实，填筑到阀门位置时，迅速截断阀门上端抽水管，关闭阀门，灌入C15混凝土，封闭井口，最后满焊封闭钢板。For large water yield wells, it is necessary to pump water continuously during the filling process. For this, the solution proposed by the present invention is to set a cube filter tank with a side length of 20cm and a wall thickness of 3mm, which can be made of plastic or steel. Insert a hard plastic pipe into the water filter tank. The diameter of the plastic pipe is greater than 3cm. The plastic pipe is provided with a valve at a position 50cm away from the wellhead, and is connected to the water inlet of the water pump. As expected, the quantitative sand, cement, and gravel dry materials are divided into 2:2: 1 ratio, mixed with sodium silicate or other quick-setting agents, and stirred evenly beside the wellhead; when the water level drops to the top of the filter tank with large-capacity pumping, put in the mixture, tamp it while pouring, and cut off quickly when it reaches the valve position. Draw the water pipe at the upper end of the valve, close the valve, pour in C15 concrete, close the wellhead, and finally weld the closed steel plate.
本发明的有益效果是，采用本发明提供的基坑底部降水井封井方法，克服了基坑施工中封井技术不完善的缺点，针对基坑工程中各种降水井的具体情况，提出封井方案，操作步骤明确，简便经济，具有很好的推广应用价值。The beneficial effect of the present invention is that, adopting the sealing method of the dewatering well at the bottom of the foundation pit provided by the present invention overcomes the shortcomings of the imperfect sealing technology in the construction of the foundation pit, and proposes a sealing method for various dewatering wells in the foundation pit engineering. Well scheme, clear operation steps, simple and economical, and has good promotion and application value.
本发明适用于基坑底部降水井封井工艺。The invention is suitable for the sealing process of the dewatering well at the bottom of the foundation pit.
附图说明Description of drawings
图1是小出水量和中等出水量井抽水示意图；Fig. 1 is a schematic diagram of pumping water from wells with small water yield and medium water yield;
图2是小出水量封井示意图；Fig. 2 is a schematic diagram of well sealing with small water output;
图3是中等出水量封井示意图；Fig. 3 is a schematic diagram of sealing a well with medium water yield;
图4是大容量井抽水示意图；Fig. 4 is a schematic diagram of large-capacity well pumping;
图5是大容量井封井示意图；Fig. 5 is a schematic diagram of large-capacity well closure;
图6是滤水箱构造图。Fig. 6 is a structural diagram of the filter tank.
图中：1为后浇底板混凝土，2为封闭钢板，3为止水腻子，4为防水板，5为降水井管，6为透水砂砾，7为止水翼钢板，8为钢管，9为水管阀门，10为垫层，11为滤水箱，12为C15混凝土，13为砂子水泥碎石混合料，14为抽水泵，15为底板混凝土。In the figure: 1 is post-cast floor concrete, 2 is closed steel plate, 3 is water-stop putty, 4 is waterproof board, 5 is dewatering well pipe, 6 is permeable gravel, 7 is water-stop steel plate, 8 is steel pipe, and 9 is water pipe valve , 10 is the cushion layer, 11 is the filter tank, 12 is C15 concrete, 13 is the sand cement crushed stone mixture, 14 is the water pump, and 15 is the floor concrete.
具体实施方式detailed description
某一基坑工程深度8m，紧临海河，地下水量充沛，全场设降水井30口，井径0.5m。当基坑开挖至设计高程时，清理基底面；铺设垫层10，在降水井管5外套上厚为5mm的钢管8，钢管顶端距离基础混凝土顶面10cm，将铺设到降水井边的防水板4满焊焊接到钢管8表面，并在焊缝周围涂上止水腻子3；在钢管顶端外沿的位置，以满焊的方式焊上一圈钢板7作为止水翼，止水翼钢板宽20cm，厚为5mm；铺设防水板保护层和底板钢筋，井孔处的内缘受力筋先断开并弯起，预留施工封闭钢板空间，浇筑底板混凝土15并捣固密实；A certain foundation pit project has a depth of 8m, is adjacent to the Haihe River, and has abundant groundwater. There are 30 dewatering wells with a diameter of 0.5m. When the foundation pit is excavated to the design elevation, the base surface is cleaned; the cushion layer 10 is laid, and the steel pipe 8 with a thickness of 5 mm is placed on the outer casing of the dewatering well pipe 5, and the top of the steel pipe is 10 cm away from the top surface of the foundation concrete, and the waterproofing of the laying to the dewatering well edge is carried out. The plate 4 is fully welded to the surface of the steel pipe 8, and the water-stop putty 3 is applied around the weld; at the outer edge of the top of the steel pipe, a circle of steel plates 7 is welded in a full-welded manner as a water-stop foil, and the water-stop steel plate The width is 20cm, and the thickness is 5mm; the waterproof board protection layer and the bottom plate reinforcement are laid, the inner edge of the well hole is first broken and bent, and the space for the closed steel plate is reserved for construction, and the bottom plate concrete is poured 15 and tamped tightly;
按照需要依次封堵降水井。前7口井在抽水试验中，抽空井内水以后，水位恢复到基坑底部历时皆超过10分钟，测量实际井深为5m，每口井旁准备好回填所需量的C15混凝土1m3，截断降水井管5，大容量抽水，待抽水完成，快速提出抽水泵14，迅速向井管内填入C15混凝土12，并封闭井口。最后焊接封闭钢板2，满焊密封。连接底板内缘受力筋，灌注后浇底板混凝土1（微膨胀）。Block the dewatering wells sequentially as required. In the pumping test of the first 7 wells, it took more than 10 minutes for the water level to return to the bottom of the foundation pit after pumping out the water in the well. Well pipe 5, large-capacity pumping, when the pumping is completed, the water pump 14 is proposed quickly, and C15 concrete 12 is filled into the well pipe quickly, and the wellhead is closed. Finally, the closed steel plate 2 is welded and fully welded and sealed. Connect the stress tendons on the inner edge of the bottom slab, pour the bottom slab concrete 1 (micro-expansion) after pouring.
随着降水井的减少，剩余降水井的单位时间涌水量不断增加，通过抽水试验，第8号至第23号井，抽空井内水以后，水位恢复到基坑底部历时皆处于3-10分钟范围内，在每口井旁边准备1m3按2：2：1的比例拌合的砂子、水泥、碎石干料混合料13，截断降水井管5，大容量抽水，待抽水完成，快速提出抽水泵14，迅速向井内投放混合料13，边投放边夯实，填筑完成后，封闭井口。最后焊接封闭钢板2，满焊密封。连接底板内缘受力筋，灌注混凝土1（微膨胀）。With the reduction of precipitation wells, the water inflow per unit time of the remaining precipitation wells continues to increase. Through the pumping test, after the water in the wells No. 8 to No. 23 is pumped out, the water level returns to the bottom of the foundation pit within 3-10 minutes. Inside, prepare 1m 3 sand, cement, and crushed stone dry material mixture 13 mixed in a ratio of 2:2:1 next to each well, cut off the dewatering well pipe 5, and pump water with a large capacity. The water pump 14 throws the mixture 13 into the well quickly, and tamps it while putting it in. After the filling is completed, the wellhead is closed. Finally, the closed steel plate 2 is welded and fully welded and sealed. Connect the reinforcement on the inner edge of the bottom plate and pour concrete 1 (micro-expansion).
因为降水井的大量减少，剩余7口降水井在抽水试验中，抽空井内水以后，水位恢复到基坑底部历时皆不到3分钟，将边长为20cm的正方体滤水箱11用透水布料包裹，连接硬质塑料管放置到井底，硬质塑料管在距离井口50cm的位置设置水管阀门9，外接抽水泵14进水口；在每口井旁边准备1m3按2：2：1的比例拌合的砂子、水泥、碎石干料混合料13，掺入水玻璃或其他速凝剂，在井口旁搅拌均匀；截断降水井管5，大容量抽水，待水位降到滤水箱11顶端时，迅速向井内投放混合料13，边投边夯实，填筑到水管阀门9位置时，迅速截断水管阀门9上端抽水管，关闭水管阀门9，继续投入混合料13并夯实，封闭井口，最后焊接封闭钢板2，满焊密封。连接底板内缘受力筋，灌注混凝土1（微膨胀）。Due to the large reduction of precipitation wells, in the pumping test of the remaining 7 precipitation wells, after the water in the wells was evacuated, it took less than 3 minutes for the water level to return to the bottom of the foundation pit. Connect the hard plastic pipe to the bottom of the well, set the water pipe valve 9 at a position 50cm away from the wellhead, and connect the water inlet of the external pump 14 on the hard plastic pipe; prepare 1m 3 next to each well and mix in a ratio of 2:2:1 sand, cement, crushed stone dry material mixture 13, mixed with water glass or other quick-setting agents, and stirred evenly beside the wellhead; cut off the dewatering well pipe 5, pump water in large capacity, and when the water level drops to the top of the filter tank 11, quickly Put the mixture 13 into the well, tamp it while pouring it, and when it is filled to the position of the water pipe valve 9, quickly cut off the water pipe at the upper end of the water pipe valve 9, close the water pipe valve 9, continue to put in the mixture 13 and tamp it, close the wellhead, and finally weld the closed steel plate 2. Fully welded and sealed. Connect the reinforcement on the inner edge of the bottom plate and pour concrete 1 (micro-expansion).
采用本发明提供的基坑底部降水井封井方法，有效的结合了基坑底板的施工，确保了封井的严密性，做到了封井一次成功，滴水不漏，保证了后续施工的顺利进行。Adopting the sealing method of the dewatering well at the bottom of the foundation pit provided by the present invention effectively combines the construction of the bottom plate of the foundation pit to ensure the tightness of the well sealing, achieve a successful sealing of the well once, and ensure the smooth progress of subsequent construction.
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| CN106193077B (en) * | 2016-08-26 | 2018-12-18 | 陕西建工机械施工集团有限公司 | A kind of steel cylinder formula dewatering well closing utensil and enclosure method |
| CN106400822B (en) * | 2016-09-23 | 2018-06-26 | 山东金城建设有限公司 | Deep foundation pit precipitation well shut-in well construction method |
| CN107956221B (en) * | 2017-12-12 | 2020-10-23 | 中国一冶集团有限公司 | Precipitation well pipeline protection device and construction method |
| CN108589752A (en) * | 2018-04-26 | 2018-09-28 | 青岛新华友建工集团股份有限公司 | Shallow source perched water green construction recycling construction |
| CN110241835B (en) * | 2019-05-13 | 2024-04-26 | 中建八局第二建设有限公司 | Drainage construction structure of foundation pit blind ditch and construction method thereof |
| CN111456056A (en) * | 2020-04-29 | 2020-07-28 | 中冶建工集团有限公司 | Construction method of dewatering well in deep foundation pit |
| CN112302714A (en) * | 2020-10-23 | 2021-02-02 | 中国建筑第八工程局有限公司 | Dewatering well sealing system and construction method thereof |
| CN112922585A (en) * | 2021-02-26 | 2021-06-08 | 华东交通大学理工学院 | Automatic monitoring method for liquid level height of drainage well in subway construction |
| CN113062342A (en) * | 2021-03-26 | 2021-07-02 | 中铁二十局集团第六工程有限公司 | Dewatering well structure in foundation pit and construction method |
| CN113832952B (en) * | 2021-09-25 | 2022-09-30 | 浙江省浙南综合工程勘察测绘院有限公司 | Soft soil foundation reinforcing method |
| CN114922213A (en) * | 2022-06-08 | 2022-08-19 | 中冶建工集团有限公司 | Pressure-bearing dewatering well and well sealing construction method thereof |
| CN116024998A (en) * | 2023-03-16 | 2023-04-28 | 北京城建建设工程有限公司 | Construction method for water-sealing blocking of deep foundation pit dewatering well |
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Effective date of registration: 20200813 Address after: 310000 259 room 2, 1 building, 1 1 Binan Road, Binjiang District, Hangzhou, Zhejiang. Patentee after: HANGZHOU FUSHIDE GEOTECHNICAL Co.,Ltd. Address before: 330031 Jiangxi city of Nanchang Province East Shuanggang Street No. 808 Patentee before: East China Jiaotong University |
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Denomination of invention: A sealing method for dewatering wells at the bottom of foundation pits Effective date of registration: 20230612 Granted publication date: 20170301 Pledgee: Agricultural Bank of China Co.,Ltd. Hangzhou Xincheng Sub branch Pledgor: HANGZHOU FUSHIDE GEOTECHNICAL Co.,Ltd. Registration number: Y2023980043552 |