CN113981987A - Full-recovery steel pile combined continuous wall - Google Patents
Full-recovery steel pile combined continuous wall Download PDFInfo
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- CN113981987A CN113981987A CN202111375859.7A CN202111375859A CN113981987A CN 113981987 A CN113981987 A CN 113981987A CN 202111375859 A CN202111375859 A CN 202111375859A CN 113981987 A CN113981987 A CN 113981987A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 142
- 239000010959 steel Substances 0.000 title claims abstract description 142
- 238000011084 recovery Methods 0.000 title claims description 6
- 239000002689 soil Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 230000002209 hydrophobic effect Effects 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 19
- 238000010276 construction Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- -1 silt Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Images
Classifications
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- 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
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- 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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- 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
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
- E02D19/185—Joints between sheets constituting the sealing aprons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0266—Retaining or protecting walls characterised by constructional features made up of preformed elements
-
- 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
-
- 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
- E02D5/14—Sealing joints between adjacent 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
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Composite Materials (AREA)
- Chemical & Material Sciences (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a fully-recycled steel pile combined continuous wall which comprises a plurality of sub-components and a plurality of main components, wherein each sub-component comprises an I-shaped steel pile and two steel plates welded on the side wall of the I-shaped steel pile, the two steel plates are positioned in the same plane, and the ends of the two steel plates, which are opposite to each other, are provided with steel pipe mortise heads; the female component is of a cylindrical structure comprising a steel pipe pile and a steel pipe, and a plurality of mortises are formed in the side wall of the female component; the width of the rabbet of the mortise is equal to the thickness of the steel plate of the sub-component; the mortise heads of the opposite ends of the adjacent sub-components are respectively inserted into the two mortises of the main component; the female member and the mortise head are vertically arranged. The invention has simple structure, good water stopping effect, recyclability and reusability, low manufacturing cost and short construction period, and can be used as a supporting structure to be applied to deep foundation pit supporting or cofferdam engineering.
Description
Technical Field
The invention relates to the field of foundation pit retaining engineering, cofferdam engineering and retaining wall engineering in civil engineering, in particular to a fully-recycled steel pile combined continuous wall.
Background
A steel pipe pile continuous Wall (WSP) construction method is a novel deep foundation pit enclosure technology for bearing water and soil pressure by using large-diameter steel pipe piles, and comprises the steps of sleeving adjacent steel pipe piles for blocking soil between the piles, arranging a water stopping cavity at a joint part, installing an elastic bag in the water stopping cavity and filling water to seal the joint of the adjacent piles, so that the purpose of water leakage stopping is achieved, and a continuous wall body is formed for enclosure of a foundation pit. The enclosure structure solves the problem of water stop of the joint of the steel pipe pile in a water plugging mode, and realizes the complete micro-disturbance recovery of the continuous wall of the steel pipe pile in a soil plug compensation mode. The enclosure forms such as 'half slope releasing', 'steel wall inclined pile', 'steel wall inclined anchor', 'steel wall row pile', 'steel wall inner support' and the like, and compared with supporting structures such as underground continuous walls, SMW construction methods, bored piles and the like, the enclosure has the advantages of high construction speed, high strength, low manufacturing cost, environmental protection and the like, and provides a brand new direction for the development of deep foundation pit enclosure technology.
The PC (Pipe-Combination) construction method pile is connected with one or more Larsen piles through lock catches welded on the steel Pipe pile to form the steel continuous wall. At present, the models of the steel pipe piles commonly used in the domestic PC construction method are 915 mm multiplied by 14 mm (outer diameter multiplied by wall thickness) and 630 mm multiplied by 14 mm (outer diameter multiplied by wall thickness), the models of the Larsen piles comprise Larsen piles of 400 mm and 600 mm, and 900 mm ultra-wide cap type Larsen piles. The pile of the PC construction method is a novel green enclosing process, and has the following outstanding advantages: (1) the construction speed is high; (2) no need of cement and no need of maintenance; (3) the enclosure rigidity is high, and the stress is good; (4) no slurry, no large noise and no large vibration; (5) can be recycled by repeated utilization; (6) the electricity consumption is small; (7) the method is suitable for soft soil, silt, clay, pebbles, silt filling and dredger fill; (8) the water stopping effect is good.
The former 2 kinds of enclosure structures have complicated water leakage blocking process; the latter relies on the interlock of steel sheet pile to carry out the stagnant water, when the inside and outside water and soil pressure difference of foundation ditch is great, can lead to opening of steel sheet pile interlock part to warp, is unfavorable for stagnant water.
Disclosure of Invention
In order to solve the technical problems, the invention provides the full-recovery automatic water-stopping steel pipe pile continuous wall which is simple in structure, convenient to construct, capable of reducing supporting cost and short in construction period.
The technical scheme adopted by the invention is as follows: a full-recovery steel pile combined continuous wall comprises a plurality of sub components and a plurality of main components, wherein each sub component comprises an I-shaped steel pile and two steel plates welded on the side wall of the I-shaped steel pile, the two steel plates are positioned in the same plane, and the ends of the two steel plates, which are opposite to each other, are provided with steel pipe mortise heads; the female component is of a cylindrical structure comprising a steel pipe pile and a steel pipe, and a plurality of mortises are formed in the side wall of the female component; the mortise heads of the opposite ends of the adjacent sub-components are respectively inserted into the two mortises of the main component; the female member and the mortise head are vertically arranged.
Furthermore, the female component comprises a steel pipe pile, a mortise is formed by welding a mortise steel pipe on the inner wall of the steel pipe pile, and a slot is formed at the tangent position of the mortise steel pipe and the steel pipe pile; the mortise steel pipe is made of Q235B material; the upper end opening of the slot is in a V shape with a big top and a small bottom, and the slot opening is straight and smooth, so that the mortise head of the sub-component can be conveniently inserted; the setting depth of the steel plate in the sub-component is not more than that of the steel pipe pile and the I-shaped steel pile; and the insertion depth of the I-shaped steel pile is the same as that of the steel pipe pile.
Furthermore, epoxy resin hydrophobic coatings are arranged on the side face of the mortise head, the inner side face of the mortise of the female component and the side face of the slot, and the steel plate of the sub-component is in over-win fit with the slot.
Furthermore, the size of the gripping force between the steel plate of the sub-component and the slot is positively correlated with the water-soil pressure difference outside the steel pipe pile and inside the steel pipe pile; the length of the mortise head of the sub-component is greater than that of the steel plate; the length of the female component slot is equal to the length of the steel pipe pile and the length of the mortise steel pipe.
Furthermore, when the continuous wall is in a corner, the included angle of the two mortises of the adjacent two sub-components of the continuous wall connected with the steel pipe pile on the female component at the corner is the corner angle of the continuous wall.
Compared with the prior art, the invention has the beneficial effects that:
1. the primary and secondary components are connected through the mortise and tenon structure, so that the structure is simple, the primary and secondary components can be fully recycled, and the supporting cost is reduced;
2. the mortise steel pipe in the female component is arranged on the inner wall of the steel pipe pile, so that the resistance of the steel pipe pile is reduced when the steel pipe pile is penetrated and pulled out. And for the steel pipe pile (such as a corner steel pipe pile) with asymmetric slotting, eccentric load cannot be generated during penetration to influence the perpendicularity of the pile body.
3. The size of the gripping force between the slot of the female component and the steel plate of the sub-component is subjected to multiple restrictions of the elasticity of the steel pipe and the pressure of water and soil inside and outside the steel pipe pile, the tight contact state between the steel pipe pile and the inserted falcon steel plate can be maintained, and the steel pipe pile can be kept stable under the condition of horizontal displacement. The water stopping effect can be improved by increasing the biting force of the slot notch on the mortise head steel plate through soil taking and loosening by using the spiral drill rod in the steel pipe pile, and the method is simple and reliable.
4. The width of the notch of the invention is consistent with the thickness of the inserted steel plate, after the mortise head is inserted into the mortise, the notch is blocked by the steel plate, and the water seepage passage inside and outside the continuous wall is automatically blocked; after the hydrophobic epoxy resin coating is arranged at the mortise-tenon joint, the water stopping effect is better, and the coating covering part has the functions of rust prevention, corrosion prevention, fouling prevention and the like.
5. The sub-component of the invention uses the H-shaped steel pile to replace the steel pipe pile in the WSP construction method and the steel sheet pile in the PC construction method, the used material is less, and the resistance of piling and pulling the pile is reduced; the width of the I-shaped steel sheet pile in the continuous wall is the same as the diameter of the steel pipe pile, so that the I-shaped steel waist beam is convenient to arrange and is connected with the inner support.
Drawings
Fig. 1 is a top view of the present invention.
Fig. 2 is a sectional view a-a' in fig. 1.
Fig. 3 is a sectional view of B-B' in fig. 1.
FIG. 4 is a cross-sectional view of a male and female component of the present invention: (A) the structure of the sub-member of the present invention, (B) the structure of the female member when the continuous wall of the present invention is not turned, (C) the structure of the female member when the continuous wall of the present invention is turned,
in the figure: 1-H-shaped steel pile; 2-a steel plate; 3-mortise head; 4, steel pipe piles; 5, mortise steel pipes; 6, a slot.
Fig. 5 is a top view of the partial water penetration passage shown in fig. 1.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1-4, the invention comprises a plurality of sub-components and a plurality of main components, wherein each sub-component comprises an i-shaped steel pile 1 with the width of 920mm and two steel plates 2 welded on the side wall of the i-shaped steel pile 1, the two steel plates 2 are positioned in the same plane, and the ends of the two steel plates 2, which are opposite to each other, are provided with mortise heads 3. The female member is a cylindrical structure, and two mortises (the number of the mortises is not limited to two, and can be more than two) are arranged on the side surface of the female member. The mortise heads 3 at the opposite ends of the two adjacent sub-components are respectively inserted into the two mortises of the female component, and the female component and the mortise heads 3 are vertically arranged. When the continuous wall needs to be turned, the phase angle of the two mortises on the female member for connecting the male members is designed according to the turning angle, as shown in fig. 4 (C), the phase angle of the two mortises of the female member is 90 degrees, and the continuous wall is used for 90 degrees turning angles. When the continuous wall needs to rotate 120 degrees, the phase angle of the two mortises of the female member is 120 degrees.
The female member comprises a steel pipe pile 4, the steel pipe pile 4 is made of Q235B steel pipes with the diameter of 920mm, and the wall thickness of the steel pipe pile 4 is 10 mm. The mortise of the female component is formed by welding a mortise steel pipe 5 on the inner wall of the steel pipe pile 4 and arranging a slot 6 at the tangent position of the mortise steel pipe 5 and the steel pipe pile 4. The mortise steel pipe 5 is made of Q235B steel pipe with diameter of 76 mm. The steel plate is made of Q235B material and has a thickness of 8 mm. The upper port of the slot 6 of the female component is V-shaped with a big top and a small bottom, so that the mortise head 3 and the steel plate 2 can be conveniently inserted. The mortise head adopts a Q235B steel pipe with the diameter of 57 mm. For better water stopping, the notch of the slot 6, the inner side wall of the mortise steel pipe 5 and the outer side wall of the mortise head 3 are provided with hydrophobic epoxy resin coatings, and the width of the slot is the same as the thickness of the steel plate of the sub-component and is 8 mm. The mortise 3 of the sub-component is mutually meshed and sleeved with the mortise of the female component. And epoxy resin hydrophobic coatings are arranged on the side surface of the mortise 3, the inner side surface of the mortise of the female component and the side surface of the slot, and the steel plate 2 of the sub-component is in interference fit with the slot 6. The size of the occlusion force between the steel plate 2 and the slot 6 of the sub-component is positively correlated with the water-soil pressure difference outside the steel pipe pile and inside the steel pipe pile; the length of the mortise head 3 of the sub-component is greater than that of the steel plate 2; the length of the female member slot 6 is equal to the length of the steel pipe pile and the length of the mortise steel pipe. As shown in fig. 5, the permeation pathway of groundwater from the outside of the foundation pit to the inside of the foundation pit is blocked, and groundwater can permeate into the foundation pit only through the lower end of the by-pass steel pipe continuous wall.
Claims (5)
1. A full-recovery steel pile combined continuous wall comprises a plurality of sub components and a plurality of main components, wherein each sub component comprises an I-shaped steel pile and two steel plates welded on the side wall of the I-shaped steel pile, the two steel plates are positioned in the same plane, and the ends of the two steel plates, which are opposite to each other, are provided with steel pipe mortise heads; the female component is of a cylindrical structure comprising a steel pipe pile and a steel pipe, and a plurality of mortises are formed in the side wall of the female component; the mortise heads of the opposite ends of the adjacent sub-components are respectively inserted into the two mortises of the main component; the female member and the mortise head are vertically arranged.
2. The fully recycled steel pile combined continuous wall as claimed in claim 1, which is characterized in that: the female component comprises a steel pipe pile, a mortise is formed by welding a mortise steel pipe on the inner wall of the steel pipe pile, and a slot is formed at the tangent position of the mortise steel pipe and the steel pipe pile; the mortise steel pipe is made of Q235B material; the upper end opening of the slot is in a V shape with a big top and a small bottom, and the slot opening is straight and smooth, so that the mortise head of the sub-component can be conveniently inserted; the setting depth of the steel plate in the sub-component is not more than that of the steel pipe pile and the I-shaped steel pile; and the insertion depth of the I-shaped steel pile is the same as that of the steel pipe pile.
3. The fully recycled steel pile combined continuous wall as claimed in claim 2, which is characterized in that: and epoxy resin hydrophobic coatings are arranged on the side surface of the mortise head, the inner side surface of the mortise of the female component and the side surface of the slot, and the steel plate of the sub-component is in interference fit with the slot.
4. The fully recycled steel pile combined continuous wall as claimed in claim 3, which is characterized in that: the size of the occlusion force between the steel plate of the sub-component and the slot is positively correlated with the water-soil pressure difference outside the steel pipe pile and inside the steel pipe pile; the length of the mortise head of the sub-component is greater than that of the steel plate; the length of the female component slot is equal to the length of the steel pipe pile and the length of the mortise steel pipe.
5. The fully recycled steel pile combined continuous wall as claimed in claim 1, which is characterized in that: when the continuous wall is in a corner, the included angle of the two mortises of the adjacent two sub-components of the continuous wall connected with the steel pipe pile on the female component at the corner is the corner angle of the continuous wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375859.7A CN113981987A (en) | 2021-11-19 | 2021-11-19 | Full-recovery steel pile combined continuous wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375859.7A CN113981987A (en) | 2021-11-19 | 2021-11-19 | Full-recovery steel pile combined continuous wall |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113981987A true CN113981987A (en) | 2022-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111375859.7A Pending CN113981987A (en) | 2021-11-19 | 2021-11-19 | Full-recovery steel pile combined continuous wall |
Country Status (1)
| Country | Link |
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| CN (1) | CN113981987A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05112929A (en) * | 1991-10-24 | 1993-05-07 | Nippon Steel Corp | Steel pipe pile column construction method |
| CN102900089A (en) * | 2012-10-31 | 2013-01-30 | 东南大学 | Combined steel pile cofferdam provided with water swellable waterproof rubber fore shaft |
| TWM603893U (en) * | 2020-08-11 | 2020-11-11 | 萬德營造有限公司 | Water-stop structure of pipe power steel pipe joint |
| CN213390150U (en) * | 2020-07-12 | 2021-06-08 | 中交路桥建设有限公司 | Steel-pipe pile cofferdam stagnant water structure |
| CN113026723A (en) * | 2021-02-22 | 2021-06-25 | 南通四建集团有限公司 | Special-shaped ribbed plate combined water stop structure of underground continuous wall and construction method |
-
2021
- 2021-11-19 CN CN202111375859.7A patent/CN113981987A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05112929A (en) * | 1991-10-24 | 1993-05-07 | Nippon Steel Corp | Steel pipe pile column construction method |
| CN102900089A (en) * | 2012-10-31 | 2013-01-30 | 东南大学 | Combined steel pile cofferdam provided with water swellable waterproof rubber fore shaft |
| CN213390150U (en) * | 2020-07-12 | 2021-06-08 | 中交路桥建设有限公司 | Steel-pipe pile cofferdam stagnant water structure |
| TWM603893U (en) * | 2020-08-11 | 2020-11-11 | 萬德營造有限公司 | Water-stop structure of pipe power steel pipe joint |
| CN113026723A (en) * | 2021-02-22 | 2021-06-25 | 南通四建集团有限公司 | Special-shaped ribbed plate combined water stop structure of underground continuous wall and construction method |
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Application publication date: 20220128 |