CN111535345A - Rapid leakage-stopping method and structure of underwater steel sheet pile cofferdam - Google Patents
Rapid leakage-stopping method and structure of underwater steel sheet pile cofferdam Download PDFInfo
- Publication number
- CN111535345A CN111535345A CN202010423379.2A CN202010423379A CN111535345A CN 111535345 A CN111535345 A CN 111535345A CN 202010423379 A CN202010423379 A CN 202010423379A CN 111535345 A CN111535345 A CN 111535345A
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- steel sheet
- sheet pile
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- cofferdam
- leakage
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 86
- 239000010959 steel Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 239000002985 plastic film Substances 0.000 claims description 25
- 229920006255 plastic film Polymers 0.000 claims description 25
- 238000005086 pumping Methods 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 5
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 230000037303 wrinkles Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 11
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 7
- 235000017491 Bambusa tulda Nutrition 0.000 description 7
- 241001330002 Bambuseae Species 0.000 description 7
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 7
- 239000011425 bamboo Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005527 soil sampling Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
- E02D5/06—Fitted piles or other elements specially adapted for closing gaps between two sheet piles or between two walls of sheet piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
- E02D5/08—Locking forms; Edge joints; Pile crossings; Branch pieces
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a rapid leakage stopping method and a rapid leakage stopping structure based on an underwater steel sheet pile cofferdam, which are used for constructing underwater structures or structures and solving the problem that water-free operation is realized by taking the cofferdam in the form of steel sheet piles and the like as a measure. Multiple practices prove that the water-stopping efficiency is high and the success rate reaches 100 percent when the cofferdam locking and water leakage treatment of the steel sheet piles in water is carried out by adopting the method; safe and reliable, the suitability is strong, the man-hour is short, the expense is little, and the site operation personnel operate easily moreover.
Description
Technical Field
The invention relates to the engineering construction field of water conservancy, bridges, ports, wharfs, channels and the like. More specifically, in the construction of underwater structures or structures, cofferdams in the form of steel sheet piles or the like are often used as a means for solving the problem in order to achieve a waterless operation. After the steel sheet pile cofferdam is constructed, water is pumped in the cofferdam, a cofferdam supporting system is installed, soil is taken out, bottom sealing and other subsequent processes are carried out, and the water leakage caused by local gaps of locking notches of adjacent steel sheet piles is found.
Background
Along with the rapid development of economic construction in China, underwater structure projects such as house construction, bridges, water conservancy, docks, port navigation and the like increasingly adopt the water stopping measures of the steel sheet pile cofferdam, and once the water leakage phenomenon of the steel sheet pile cofferdam occurs, the water stopping effect of the cofferdam is directly influenced. If the treatment method is improper, the work is often done twice with half the effort, so that the economic investment is increased, and the project progress is influenced.
At present, after water leakage is found in the cofferdam, people often utilize the difference of water heads inside and outside the cofferdam, and send mixed graded coarse sand, sawdust powder and cement to a water leakage part through a guide pipe arranged on the outer side of a steel sheet pile under the action of water flow adsorption force, so that the problem of leakage stopping of the steel sheet pile is solved. Therefore, the water stopping effect is poor, and people can accurately block the water by directly adopting the diver to launch without using a leaking stoppage conduit in order to improve the water stopping effect. By adopting plugging materials such as graded coarse sand, sawdust powder, cement mixture and the like, the rate of later-stage mouth locking and leakage recovery is high. In order to reduce the leakage rate, after the first plugging is performed without leakage, the inner side of the locking opening of the steel sheet pile is dried, and plugging materials such as wood foam and cotton wool are injected into the original water leakage locking opening in time. The above method has improved effect, but has long working hours and high cost.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the method for rapidly stopping the water steel sheet pile cofferdam from leaking, and multiple practices prove that the method for treating the water steel sheet pile cofferdam from leaking can achieve a success rate of 100%. The method can improve the water leakage treatment time efficiency, reduce the economic investment and be easier to be mastered by constructors.
In order to achieve the purpose, the invention provides the following technical scheme:
the quick leakage stopping method for the underwater steel sheet pile cofferdam comprises the following steps:
(1) after the steel sheet pile cofferdam is arranged, pumping water in the cofferdam, and finding that the locking notch of the adjacent steel sheet pile has a local water leakage phenomenon in the process of pumping water;
(2) a PVC or PE film strip is taken from the outer side of the steel sheet pile cofferdam along the vertical locking notch of the water leakage part, the bottom end of the PVC or PE film strip is buried below a riverbed by means of a rod piece, the top end of the PVC or PE film strip is fixed on the steel sheet pile above the water surface, the film strip is pushed to the water leakage part of the cofferdam locking notch by water flow thrust, and the film strip is tightly extruded and attached to the surface of the locking notch of the steel sheet pile by the water pressure of the film strip, so that the water leakage locking notch gap of.
The invention has the further improvement scheme that the length of the film belt is 30-50 cm below the riverbed, the water depth and the exposed part of the water surface of the steel sheet pile, the width is about 300mm, and the thickness is about 0.03 mm. The length of the film belt, especially the depth of the film belt penetrating into the lower part of the riverbed can ensure that the plastic film belt is not flushed by water flow and even is flushed away; the thickness of the film belt is preferably moderate, the film belt is too thick and is not easy to be adsorbed on the water leakage part of the locking notch of the steel sheet pile, and the film belt is too thin and is easy to damage the cup.
According to a further improvement scheme of the invention, the bottom of the film belt is clamped at the bottom end of the rod piece, the film belt is gradually unfolded upwards in a wide range from the bottom to reduce wrinkles as much as possible, then the film belt is inserted into the position 30-50 cm below a river bed along the vertical locking opening of the water-leaking steel sheet pile cofferdam by means of the light rod piece, and the plastic film and the steel sheet pile are fixed together by the top end of the film belt through a plastic adhesive tape or other methods.
The invention has the further improvement scheme that the bottom end of the rod piece is processed into an inclined plane, the middle part of the inclined plane is provided with an n-shaped groove with a downward opening, the bottom of the film belt is knotted, and the neck part of the knot is temporarily clamped in the groove at the bottom of the rod piece. The inclined plane at the bottom end of the rod piece is easier to insert into a riverbed, and the groove on the inclined plane is favorable for temporarily clamping the film belt and is convenient for the film belt to be separated from the rod piece after the film belt is inserted in place.
The invention further improves the scheme that the depth of the groove is about 20mm, and the width of the groove is about 5 mm.
In a further improvement of the invention, after the locking notch of the steel sheet pile cofferdam does not leak water, the water pumping is continued, if the water leakage is found again, the method in the step (2) in the claim 1 can be repeated until the water level in the cofferdam is pumped down to the required water level.
A rapid leakage-stopping structure of an underwater steel sheet pile cofferdam comprises a plurality of steel sheet piles which are sequentially connected to enclose a synthetic closed cofferdam, a water leakage locking notch is formed between the two steel sheet piles, a film belt is attached to the water leakage locking notch from the top of the steel sheet pile to the bottom of a riverbed in an extruding mode outside the steel sheet pile, the bottom of the film belt is buried in soil of the riverbed, and the top of the film belt is fixed with the steel sheet piles together.
The invention has the further improvement scheme that the length of the film belt is 30-50 cm below the riverbed, the water depth and the exposed part of the water surface of the steel sheet pile, the width is about 300mm, and the thickness is about 0.03 mm.
The invention further improves the scheme that the film belt is wide and flat and stuck on the outer side of the steel sheet pile of the water leakage locking notch.
The invention has the beneficial effects that:
multiple practices prove that the water-stopping efficiency is high, the re-leakage rate is low, and the success rate can reach 100 percent by adopting the method to perform the water-sealing water leakage treatment of the locking notch of the steel sheet pile cofferdam in water; in addition, the invention has the advantages of safety, reliability, strong applicability, short working hours, low cost and easy operation for field construction personnel.
Drawings
FIG. 1 is a schematic top view of a cofferdam with steel sheet piles in water according to the present invention;
FIG. 2 is a longitudinal elevation view of the underwater steel sheet pile cofferdam of the present invention;
FIG. 3 is a partial three-dimensional schematic view of the underwater steel sheet pile cofferdam of the present invention;
FIG. 4 is a construction state progression diagram of the present invention;
wherein: a is a schematic diagram of a steel sheet pile cofferdam just driven before leakage-stopping installation,
b is a schematic view of the cut leakage-stopping plastic film strip,
c is a schematic view of the plastic film belt for stopping leakage by lowering the processed bamboo pole,
d is a schematic diagram of the steel sheet pile cofferdam after the completion of the leakage-stopping installation,
e is a schematic diagram of a cofferdam supporting system for installing a first steel sheet pile,
f, the subsequent work of constructing the second cofferdam support system and the like is schematically shown.
Detailed description of the invention
As shown in fig. 1 to 4, a series of plan views of the construction of the steel sheet pile cofferdam 1 is performed on the water surface 9. The method is suitable for the phenomenon of water leakage or water seepage of the steel sheet pile cofferdam 1 during construction, so that the follow-up work such as drainage in the cofferdam, cofferdam support, soil sampling in the cofferdam and the like cannot be carried out, and the quick leakage stopping method provided by the invention is started.
Firstly, driving steel sheet piles according to a construction scheme of the steel sheet pile cofferdam 1, and after the steel sheet piles are driven, the next procedure construction can be carried out after the steel sheet piles pass the acceptance of relevant departments on the aspects of the perpendicularity, the size of the cofferdam and the depth of the soil.
In the process of pumping water in the cofferdam, after the water leakage phenomenon of the locking notch 6 of the cofferdam is found, the water leakage position and the water leakage depth are determined in time, if the water leakage position is above the horizontal support systems 2, 3 and 4 of the first steel plate pile cofferdam, the water level in the steel plate pile cofferdam 1 is pumped down by adopting a plurality of water pumps, the water discharge is ensured to be greater than the water leakage amount, one water leakage position is found, the water leakage position is blocked up in time until the water level in the cofferdam is reduced to 0.5m below the first support bracket, and the dry operation of the support system is facilitated. When water leaks from the locking notch of the steel sheet pile cofferdam, the method is adopted to plug in time. The plugging method is detailed in the specific implementation method of the invention.
Before the leakage phenomenon of the locking notch 6 of the steel sheet pile cofferdam is treated, enough plastic films with the thickness of 0.03mm are selected and purchased. And cutting the plastic film qualified by acceptance into strips with the width of about 300mm, wherein the length of the film belt 7 is determined according to the height of the steel sheet pile exposed out of the water surface 9, the water depth and the soft state of the riverbed 8. The concrete depth of the plastic film strip is generally the depth of the river bed 8 which can be buried (about 40 cm), the maximum depth of water, the height of the steel sheet piles exposed out of the water surface (about 9 cm) and the margin of about 70 cm.
Before the plastic film belt 7 is installed, a knot 11 needs to be arranged at the bottom end of the plastic film belt 7, the knot 11 needs to be ensured to be free from automatically falling off along with the bottom end of the bamboo pole 10 after being inserted into a river bed, then the bottom of the knot 11 is clamped in a notch at the bottom of a bamboo pole 10 which is prepared in advance, the groove is about 20mm deep and about 5mm wide, and the same size of the notch also needs to be ensured to be capable of automatically falling off the bottom end of the bamboo pole 10 after the plastic film belt 7 is withdrawn from the river bed. This is typically done by two people, one of whom arranges the plastic film strip 7 with the knots 11 at the bottom end straight and unfolds, the other person puts the bottom end of the bamboo pole 10 along the outer locking notch 6 of the leaking steel sheet pile to the bottom of the water, and then after the first person puts the plastic film strip 7 in place symmetrically above the locking notch 6 of the leaking steel sheet pile, the bottom end of the bamboo pole together with the bottom end of the plastic film strip 7 is inserted into the riverbed 8 until one person feels that the insertion is difficult. The bamboo poles 10 are then pulled out of the bed while the bottom ends of the strips of plastic film 7 remain inside the bed 8. And finally, a person in charge of placing the plastic film belt 7 arranges and straightens the film belt 7 tightly attached to the locking notch 6 on the outer side of the steel sheet pile, enables the film belt 7 to tightly attach to the locking notch 6 of the steel sheet pile, checks whether the water seepage phenomenon is eliminated, and fixes the upper opening of the film belt 7 and the top end of the steel sheet pile by using a plastic adhesive tape or other reliable modes if the water seepage phenomenon is not eliminated. If the water leakage phenomenon is not eliminated, it indicates that the position of the locking notch 6 of the plastic film belt 7 and the steel sheet pile is deviated, or the plastic film belt 7 is not well unfolded and adsorbed at the locking notch part of the steel sheet pile, and the posture and the position of the plastic film belt 7 need to be properly adjusted to ensure that the water cannot leak.
After all the locking notches 6 with water leakage of the steel sheet piles are treated, the construction of the next procedure can be carried out, such as the operations of continuously pumping water, checking and repairing the leakage, installing a second horizontal support 5 and the like, or taking concrete, sealing the bottom by concrete and the like. If the underwater concrete bottom sealing is carried out, generally, after soil is taken out from water, water is pumped in the cofferdam for plugging, wherein the plugging method is the same as the above method.
In the process of supporting, draining, borrowing, bottom sealing and constructing structures in the cofferdam, if secondary water leakage occurs in some locking notches of the cofferdam, the plastic film strip 7 can be damaged or the bottom end of the plastic film strip can be separated from the riverbed 8 to stop water and lose efficacy, and the plastic film strip can deviate from the water drainage position to some extent due to repeated action of water flow. These problems the above three problems can be dealt with by the following two approaches: for the former two, a method of replacing the plastic film strip 7 can be adopted; in the latter device, the top fixing of the plastic film strip 7 is released, the position is rearranged and adjusted until no water leakage occurs, and the plastic film strip 7 is fixed again. The above detailed description refers to fig. 4.
Claims (9)
1. A quick leakage stopping method for a water steel sheet pile cofferdam is characterized by comprising the following steps:
(1) after the steel sheet pile cofferdam is arranged, pumping water in the cofferdam, and finding that the locking notch of the adjacent steel sheet pile has a local water leakage phenomenon in the process of pumping water;
(2) a PVC or PE film strip is taken from the outer side of the steel sheet pile cofferdam along the vertical locking notch of the water leakage part, the bottom end of the PVC or PE film strip is buried below a riverbed by means of a rod piece, the top end of the PVC or PE film strip is fixed on the steel sheet pile above the water surface, the film strip is pushed to the water leakage part of the cofferdam locking notch by water flow thrust, and the film strip is tightly extruded and attached to the surface of the locking notch of the steel sheet pile by the water pressure of the film strip, so that the water leakage locking notch gap of.
2. The quick leakage stopping method for the underwater steel sheet pile cofferdam of claim 1 is characterized in that: the length of the film strip is 30-50 cm below the riverbed, the water depth and the exposed part of the water surface of the steel sheet pile, the width is about 300mm, and the thickness is about 0.03 mm.
3. The quick leakage stopping method for the underwater steel sheet pile cofferdam according to claim 1 or 2, characterized in that: the bottom of the film belt is clamped at the bottom end of the rod piece, the film belt is gradually unfolded upwards in a wide range from the bottom to reduce wrinkles as much as possible, then the film belt is inserted into the position, which is about 30-50 cm below a riverbed, of a vertical locking opening of the steel sheet pile cofferdam with the aid of the light rod piece, and the plastic film and the steel sheet pile are fixed together by the aid of a plastic adhesive tape or other modes at the top end of the film belt.
4. The quick leakage stopping method for the underwater steel sheet pile cofferdam of claim 1 is characterized in that: the bottom end of the rod piece is processed into an inclined plane, the middle part of the inclined plane is provided with an n-shaped groove with a downward opening, the bottom of the film belt is knotted, and the neck of the knot is temporarily clamped in the groove at the bottom of the rod piece.
5. The quick leakage stopping method for the underwater steel sheet pile cofferdam of claim 4, which is characterized in that: the groove is about 20mm deep and about 5mm wide.
6. The quick leakage stopping method for the underwater steel sheet pile cofferdam of claim 1 is characterized in that: and (3) continuing pumping water after the locking notch of the steel sheet pile cofferdam does not leak water, and repeating the method in the step (2) in the claim 1 if water leakage is found again until the water level in the cofferdam is pumped down to the required water level.
7. The swift leak-stopping structure of aquatic steel sheet pile cofferdam includes that many steel sheet piles link to each other in proper order and enclose synthetic closed cofferdam, goes out the fore shaft that has leaked between two steel sheet piles, its characterized in that: and a film belt is extruded and stuck at the water leakage locking port part from the top of the steel sheet pile to the bottom of the riverbed outside the steel sheet pile, the bottom of the film belt is buried in the riverbed soil, and the top of the film belt is fixed with the steel sheet pile.
8. The quick leakage-stopping structure of the underwater steel sheet pile cofferdam of claim 7 is characterized in that: the length of the film strip is 30-50 cm below the riverbed, the water depth and the exposed part of the water surface of the steel sheet pile, the width is about 300mm, and the thickness is about 0.03 mm.
9. The quick leakage-stopping structure of the underwater steel sheet pile cofferdam of claim 7 is characterized in that: the film belt is wide and flat and stuck on the outer side of the steel sheet pile of the water leakage locking notch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010423379.2A CN111535345A (en) | 2020-05-19 | 2020-05-19 | Rapid leakage-stopping method and structure of underwater steel sheet pile cofferdam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010423379.2A CN111535345A (en) | 2020-05-19 | 2020-05-19 | Rapid leakage-stopping method and structure of underwater steel sheet pile cofferdam |
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| CN111535345A true CN111535345A (en) | 2020-08-14 |
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| CN202010423379.2A Pending CN111535345A (en) | 2020-05-19 | 2020-05-19 | Rapid leakage-stopping method and structure of underwater steel sheet pile cofferdam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114457832A (en) * | 2022-03-23 | 2022-05-10 | 中铁四局集团有限公司 | Simple water stopping method for Larsen steel sheet pile cofferdam |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101457527A (en) * | 2008-12-26 | 2009-06-17 | 中铁大桥局集团第二工程有限公司 | Simple abd rapid water sealing method for larsen steel sheet pile cofferdam |
| CN108330995A (en) * | 2018-01-23 | 2018-07-27 | 四川公路桥梁建设集团有限公司 | Construction method of steel sheet pile cofferdam in deep water thick silt layer environment |
| CN110499772A (en) * | 2019-08-29 | 2019-11-26 | 中天路桥有限公司 | A kind of rock matter riverbed double-layer plate pile cofferdam construction method |
| CN110700293A (en) * | 2019-10-23 | 2020-01-17 | 中铁十局集团第五工程有限公司 | Rotary excavating leading hole steel sheet pile cofferdam construction method under deep water sloping rock environment |
| CN212506342U (en) * | 2020-05-19 | 2021-02-09 | 张成瑞 | Rapid leakage-stopping structure of underwater steel sheet pile cofferdam |
-
2020
- 2020-05-19 CN CN202010423379.2A patent/CN111535345A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101457527A (en) * | 2008-12-26 | 2009-06-17 | 中铁大桥局集团第二工程有限公司 | Simple abd rapid water sealing method for larsen steel sheet pile cofferdam |
| CN108330995A (en) * | 2018-01-23 | 2018-07-27 | 四川公路桥梁建设集团有限公司 | Construction method of steel sheet pile cofferdam in deep water thick silt layer environment |
| CN110499772A (en) * | 2019-08-29 | 2019-11-26 | 中天路桥有限公司 | A kind of rock matter riverbed double-layer plate pile cofferdam construction method |
| CN110700293A (en) * | 2019-10-23 | 2020-01-17 | 中铁十局集团第五工程有限公司 | Rotary excavating leading hole steel sheet pile cofferdam construction method under deep water sloping rock environment |
| CN212506342U (en) * | 2020-05-19 | 2021-02-09 | 张成瑞 | Rapid leakage-stopping structure of underwater steel sheet pile cofferdam |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114457832A (en) * | 2022-03-23 | 2022-05-10 | 中铁四局集团有限公司 | Simple water stopping method for Larsen steel sheet pile cofferdam |
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