CN113026782A - Steel sheet pile cofferdam construction process - Google Patents
Steel sheet pile cofferdam construction process Download PDFInfo
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- CN113026782A CN113026782A CN202110311268.7A CN202110311268A CN113026782A CN 113026782 A CN113026782 A CN 113026782A CN 202110311268 A CN202110311268 A CN 202110311268A CN 113026782 A CN113026782 A CN 113026782A
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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
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- 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
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- 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
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- General Engineering & Computer Science (AREA)
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- Bulkheads Adapted To Foundation Construction (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a steel sheet pile cofferdam construction process which comprises preparation before construction, guide pile driving construction, steel sheet pile inserting and driving construction, steel sheet pile folding construction, inner support installation, seepage-proofing and leakage-stopping treatment and bottom sealing concrete. The invention has the beneficial effects that: the cofferdam mode of the steel sheet pile reduces the lateral pressure of the soil body in the cofferdam to the steel sheet pile, so that the pile length is properly shortened, and compared with the traditional cofferdam structure, the using amount of the steel sheet pile is greatly reduced; because the steel sheet piles are positioned on the water-facing side of the cofferdam, the steel sheet piles are convenient to pull and pull on water, the construction difficulty of cofferdam engineering is effectively reduced, the construction quality of the cofferdam is improved, the construction progress is accelerated, and the construction period is shortened; and the steel sheet pile has better seepage-proofing effect and anti-scouring performance, compared with the traditional earth-rock cofferdam, the upstream face protection and seepage-proofing workload of the cofferdam can be greatly reduced, and the steel sheet pile cofferdam structure has better adaptability and feasibility.
Description
Technical Field
The invention relates to a steel sheet pile cofferdam, in particular to a steel sheet pile cofferdam construction process, and belongs to the technical field of building construction.
Background
Projects such as water conservancy and hydropower, water transportation port engineering and civil municipal works civil engineering which are built near water are required to be provided with construction cofferdams for retaining water before construction, so that a foundation pit is formed, and dry land construction is carried out. The cofferdam structure commonly used at present comprises an earth-rock cofferdam structure, a bagged earth cofferdam structure, a bagged sand cofferdam structure and a double-row steel sheet pile sash cofferdam structure. The prior cofferdam structure adopting bagged sand mainly has the following defects: the cofferdam has a large section, occupies a river channel and influences the drainage; the underwater filling cannot be compacted, so that the reliability is low; the side of the cofferdam facing the water body has poor anti-scouring capability. Compared with a bagged sand cofferdam structure, the steel sheet pile cofferdam structure has a smaller cofferdam section and better seepage-proofing effect and scour resistance, but the conventional steel sheet pile cofferdam structure is continuously arranged in double rows, and the using amount of steel sheet piles is large; steel sheet pile need set up the steel pull rod, and the steel pull rod generally needs the manual work on the ship to drawing, and the construction degree of difficulty is great.
Disclosure of Invention
The invention aims to provide a steel sheet pile cofferdam construction process for solving the problems.
The invention realizes the purpose through the following technical scheme: a steel sheet pile cofferdam construction process comprises the following steps:
step one, preparation before construction, inspection and renovation of steel sheet piles: the steel sheet pile is often subjected to wound, bending and buckling and locking deformation after being loaded, unloaded and transported, and the steel sheet pile needs to be inspected; checking the vibration hammer;
step two, driving guide piles into construction, namely driving positioning piles of the steel cofferdam before inserting and driving, welding brackets on the positioning piles, arranging guide beams to form a frame-type enclosure as guide equipment during pile inserting, arranging an upper layer and a lower layer on the guide frame, and marking the boundary line of each pile on the guide frame by chalk so as to correct the pile while driving in the pile driving process and prevent large deviation;
inserting and driving steel sheet piles, wherein the inserting and driving of the steel sheet piles starts from one corner, the corner piles are driven firstly, the position of the corner piles is accurate and vertical, the inclination is less than 1%, and then the steel sheet piles are inserted and driven symmetrically towards two sides by taking the first corner pile as a reference;
and step four, steel sheet pile folding construction is carried out, steel sheet pile folding is selected to be near the corner piles (generally 4-5 pieces away from the corner piles), and if the distance is different, the distance between the adjacent sides of the folding sides and the guide frame can be adjusted. When the steel sheet pile is inserted and punched to a folding surface, the size is measured accurately, the size of the folding surface is preferably larger than the theoretical size by 15-20 cm by considering the gap of a locking opening of the steel sheet pile and the performance of the steel sheet pile, and the size of the folding opening is prevented from being too small; calculating the number of required steel sheet piles according to the width of the steel sheet piles, and determining how to insert and beat the steel sheet materials in the next step according to the number;
fifthly, mounting an inner support; when the cofferdam is closed, the inner supports are installed layer by layer while pumping water, and are arranged from top to bottom while pumping water and installing
Step six, seepage-proofing and leakage-stopping treatment, wherein the cofferdam needs to be subjected to leakage-stopping treatment in time during pumping and draining, and the common method is to fill joints with butter and sawdust fillers in the construction process of steel sheet piles, or to fill a mixture of quartz sand and carbon powder at the joints of two steel sheet piles; or scattering a large amount of wood chip and slag mixture at the water leakage joint on the outer side of the cofferdam during water pumping, and stopping leakage by utilizing the water pressure to bring the mixture to the leakage joint;
and seventhly, sealing the bottom with concrete, after the steel support system is installed, excavating, sucking mud and clearing the foundation of the pit bottom by adopting a long-arm excavator matched with a grab bucket and a mud sucking machine, excavating to the designed elevation of the bottom sealing concrete, and then performing dry sealing or underwater bottom sealing according to the specific conditions of the pit bottom, and further cleaning the periphery of the constructed pile foundation before performing underwater bottom sealing so as to ensure that the bottom sealing concrete is tightly combined with the pile foundation.
3. As a still further scheme of the invention: in the first step, the examination is performed through the following aspects:
(1) whether the pile body is deformed or not and whether the two ends are cracked or curled or not;
(2) whether the locking notch is broken, twisted, defected, partially bent and welded with welding slag;
(3) whether the type widths of the steel sheet piles are consistent or not;
(4) and whether the bending phenomenon of different degrees exists.
As a still further scheme of the invention: in the third step, when the steel sheet pile is inserted and driven, the steel sheet pile is inspected and repaired before insertion and driving so that the steel sheet pile has no crack, distortion, local deformation, welding beading and the like of the locking opening, butter is coated in the locking opening seam, all holes in the steel sheet pile need to be firmly repaired by steel sheet electric welding, the inside and the outside of the locking opening are smooth and straight, and the welding seams need to be staggered during insertion and driving. The corner pile can be formed by splitting a steel sheet pile along the center line of the length direction according to the shape of the cofferdam, connecting the steel sheet pile to another steel sheet pile by adopting a mechanical means, and processing the steel sheet pile into a special-shaped pile with any angle on site.
As a still further scheme of the invention: in the third step, the steel sheet pile is inserted and driven by taking the guide beam as a reference at any time to check whether the position of the driven steel sheet pile is accurate and whether the verticality is qualified, and the deviation correction is implemented in time. In the whole process of constructing and driving the steel sheet pile cofferdam, inserting and driving one steel sheet pile at the beginning, namely driving each steel sheet pile to a designed position, when the last 5 steel sheets are left, inserting and driving the steel sheet pile first, if folding is wrong, oppositely pulling by using a chain block or a trolley group to fold the steel sheet pile, and driving the steel sheet pile to a designed depth one by one after folding.
As a still further scheme of the invention: in the fourth step, when the steel sheet piles are folded, in order to facilitate folding, 10-15 steel sheet piles adjacent to the folding port are inserted to the stable height of the pile (only the steel sheet piles are guaranteed to be stable), and adjustment of the steel sheet piles is mainly facilitated. And two piles at the folding position are higher and lower, so that pile inserting is convenient, and after the folding position is reached, the piles are driven to the designed elevation. The square steel cofferdam has 4 faces, and each steel sheet pile that has done all must be perpendicular along the normal and tangential direction of leading truck. In order to prevent two piles at the folding position from being out of a plane, the direction of the corner pile must be adjusted, and the locking notch on one side of the corner pile is kept parallel to the locking notch of the steel plate pile on the opposite side as much as possible.
As a still further scheme of the invention: in the sixth step, during the anti-seepage and leak-stopping treatment, a local concrete bottom sealing measure is adopted at the water leakage position of the pile foot of the steel sheet pile; when the leakage is seriously blocked and the leakage is difficult, a magnetic water stop strip is stuck on the outer side of the joint of the two steel sheet piles; or color strip cloth is paved along the outer side of the steel sheet pile.
As a still further scheme of the invention: in the seventh step, when the bottom sealing concrete is excavated to the designed elevation, if a large amount of water burst does not appear in the cofferdam and the seawater can be pumped out, the bottom sealing can be carried out by a dry method; if a large amount of water gushes and seawater cannot be pumped out completely, immediately stopping construction, discharging water into the cofferdam, and sealing the bottom by adopting underwater concrete; and if the water inflow is large and the measured value of the axial force of the inner support exceeds the designed warning value in the processes of pumping water and installing the inner support, stopping construction, returning water to the cofferdam, and adopting underwater concrete bottom sealing.
The invention has the beneficial effects that: the steel sheet pile cofferdam construction process is reasonable in design, the side pressure of soil in the cofferdam to the steel sheet pile is reduced in the steel sheet pile cofferdam mode, the pile length is properly shortened, and compared with the traditional cofferdam structure, the using amount of the steel sheet pile is greatly reduced; because the steel sheet piles are positioned on the water-facing side of the cofferdam, the steel sheet piles are convenient to pull and pull on water, the construction difficulty of cofferdam engineering is effectively reduced, the construction quality of the cofferdam is improved, the construction progress is accelerated, and the construction period is shortened; and the steel sheet pile has better seepage-proofing effect and anti-scouring performance, compared with the traditional earth-rock cofferdam, the upstream face protection and seepage-proofing workload of the cofferdam can be greatly reduced, and the steel sheet pile cofferdam structure has better adaptability and feasibility.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a steel sheet pile cofferdam construction process includes the following steps:
step one, preparation before construction, inspection and renovation of steel sheet piles: the steel sheet pile is often subjected to wound, bending and buckling and locking deformation after being loaded, unloaded and transported, and the steel sheet pile needs to be inspected; checking the vibration hammer;
step two, driving guide piles into construction, namely driving positioning piles of the steel cofferdam before inserting and driving, welding brackets on the positioning piles, arranging guide beams to form a frame-type enclosure as guide equipment during pile inserting, arranging an upper layer and a lower layer on the guide frame, and marking the boundary line of each pile on the guide frame by chalk so as to correct the pile while driving in the pile driving process and prevent large deviation;
inserting and driving steel sheet piles, wherein the inserting and driving of the steel sheet piles starts from one corner, the corner piles are driven firstly, the position of the corner piles is accurate and vertical, the inclination is less than 1%, and then the steel sheet piles are inserted and driven symmetrically towards two sides by taking the first corner pile as a reference;
and step four, steel sheet pile folding construction is carried out, steel sheet pile folding is selected to be near the corner piles (generally 4-5 pieces away from the corner piles), and if the distance is different, the distance between the adjacent sides of the folding sides and the guide frame can be adjusted. When the steel sheet pile is inserted and punched to a folding surface, the size is measured accurately, the size of the folding surface is preferably larger than the theoretical size by 15-20 cm by considering the gap of a locking opening of the steel sheet pile and the performance of the steel sheet pile, and the size of the folding opening is prevented from being too small; calculating the number of required steel sheet piles according to the width of the steel sheet piles, and determining how to insert and beat the steel sheet materials in the next step according to the number;
fifthly, mounting an inner support; when the cofferdam is closed, the inner supports are installed layer by layer while pumping water, and are arranged from top to bottom while pumping water and installing
Step six, seepage-proofing and leakage-stopping treatment, wherein the cofferdam needs to be subjected to leakage-stopping treatment in time during pumping and draining, and the common method is to fill joints with butter and sawdust fillers in the construction process of steel sheet piles, or to fill a mixture of quartz sand and carbon powder at the joints of two steel sheet piles; or scattering a large amount of wood chip and slag mixture at the water leakage joint on the outer side of the cofferdam during water pumping, and stopping leakage by utilizing the water pressure to bring the mixture to the leakage joint;
and seventhly, sealing the bottom with concrete, after the steel support system is installed, excavating, sucking mud and clearing the foundation of the pit bottom by adopting a long-arm excavator matched with a grab bucket and a mud sucking machine, excavating to the designed elevation of the bottom sealing concrete, and then performing dry sealing or underwater bottom sealing according to the specific conditions of the pit bottom, and further cleaning the periphery of the constructed pile foundation before performing underwater bottom sealing so as to ensure that the bottom sealing concrete is tightly combined with the pile foundation.
4. Further, in the embodiment of the present invention, in the step one, the checking is performed by:
(1) whether the pile body is deformed or not and whether the two ends are cracked or curled or not;
(2) whether the locking notch is broken, twisted, defected, partially bent and welded with welding slag;
(3) whether the type widths of the steel sheet piles are consistent or not;
(4) and whether the bending phenomenon of different degrees exists.
Furthermore, in the third step of the present invention, during the inserting and driving construction of the steel sheet pile, the steel sheet pile should be inspected and repaired before inserting and driving so as to prevent the opening of the lock from cracking, twisting, local deformation, welding beading, etc., grease is applied to the inside of the opening of the lock, all holes of the steel sheet pile must be reinforced by electric welding of the steel sheet, the inside and outside of the opening of the lock are smooth and aligned, and the welding seams must be staggered during inserting and driving. The corner pile can be formed by splitting a steel sheet pile along the center line of the length direction according to the shape of the cofferdam, connecting the steel sheet pile to another steel sheet pile by adopting a mechanical means, and processing the steel sheet pile into a special-shaped pile with any angle on site.
Furthermore, in the third step of the present invention, the steel sheet pile is inserted and driven by taking the guide beam as a reference at any time to check whether the position of the driven steel sheet pile is accurate and whether the verticality is qualified, and the deviation correction is implemented in time. In the whole process of constructing and driving the steel sheet pile cofferdam, inserting and driving one steel sheet pile at the beginning, namely driving each steel sheet pile to a designed position, when the last 5 steel sheets are left, inserting and driving the steel sheet pile first, if folding is wrong, oppositely pulling by using a chain block or a trolley group to fold the steel sheet pile, and driving the steel sheet pile to a designed depth one by one after folding.
Furthermore, in the fourth step of the present invention, in order to facilitate the folding during the construction of the steel sheet pile, 10 to 15 steel sheet piles adjacent to the folding opening are inserted to the stable height of the pile (only the steel sheet piles are guaranteed to be stable), which is mainly beneficial to the adjustment of the steel sheet piles. And two piles at the folding position are higher and lower, so that pile inserting is convenient, and after the folding position is reached, the piles are driven to the designed elevation. The square steel cofferdam has 4 faces, and each steel sheet pile that has done all must be perpendicular along the normal and tangential direction of leading truck. In order to prevent two piles at the folding position from being out of a plane, the direction of the corner pile must be adjusted, and the locking notch on one side of the corner pile is kept parallel to the locking notch of the steel plate pile on the opposite side as much as possible.
Further, in the sixth step of the invention, during the anti-seepage and leak-stopping treatment, a local concrete bottom sealing measure is adopted at the water leakage position of the pile foot of the steel sheet pile; when the leakage is seriously blocked and the leakage is difficult, a magnetic water stop strip is stuck on the outer side of the joint of the two steel sheet piles; or color strip cloth is paved along the outer side of the steel sheet pile.
Further, in the seventh embodiment of the present invention, in the step seven, when the concrete is sealed, after the cofferdam is excavated to the designed elevation, if a large amount of water burst does not occur in the cofferdam and the seawater can be pumped out, dry sealing of the bottom can be performed; if a large amount of water gushes and seawater cannot be pumped out completely, immediately stopping construction, discharging water into the cofferdam, and sealing the bottom by adopting underwater concrete; and if the water inflow is large and the measured value of the axial force of the inner support exceeds the designed warning value in the processes of pumping water and installing the inner support, stopping construction, returning water to the cofferdam, and adopting underwater concrete bottom sealing.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may include only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments as will be apparent to those skilled in the art.
Claims (7)
1. A steel sheet pile cofferdam construction process is characterized in that: the method comprises the following steps:
step one, preparation before construction, inspection and renovation of steel sheet piles: the steel sheet pile is often subjected to wound, bending and buckling and locking deformation after being loaded, unloaded and transported, and the steel sheet pile needs to be inspected; checking the vibration hammer;
step two, driving guide piles into construction, namely driving positioning piles of the steel cofferdam before inserting and driving, welding brackets on the positioning piles, arranging guide beams to form a frame-type enclosure as guide equipment during pile inserting, arranging an upper layer and a lower layer on the guide frame, and marking the boundary line of each pile on the guide frame by chalk so as to correct the pile while driving in the pile driving process and prevent large deviation;
inserting and driving steel sheet piles, wherein the inserting and driving of the steel sheet piles starts from one corner, the corner piles are driven firstly, the position of the corner piles is accurate and vertical, the inclination is less than 1%, and then the steel sheet piles are inserted and driven symmetrically towards two sides by taking the first corner pile as a reference;
and step four, steel sheet pile folding construction is carried out, steel sheet pile folding is selected to be near the corner piles, and if the distance is different, the distance between the adjacent sides of the folding sides and the guide frame can be adjusted. When the steel sheet pile is inserted and punched to a folding surface, the size is measured accurately, the size of the folding surface is preferably larger than the theoretical size by 15-20 cm by considering the gap of a locking opening of the steel sheet pile and the performance of the steel sheet pile, and the size of the folding opening is prevented from being too small; calculating the number of required steel sheet piles according to the width of the steel sheet piles, and determining how to insert and beat the steel sheet materials in the next step according to the number;
fifthly, mounting an inner support; after the cofferdam is folded, the inner supports are installed layer by layer while pumping water, and are arranged from top to bottom while pumping water and installing;
step six, seepage-proofing and leakage-stopping treatment, wherein the cofferdam needs to be subjected to leakage-stopping treatment in time during pumping and draining, and the common method is to fill joints with butter and sawdust fillers in the construction process of steel sheet piles, or to fill a mixture of quartz sand and carbon powder at the joints of two steel sheet piles; or scattering a large amount of wood chip and slag mixture at the water leakage joint on the outer side of the cofferdam during water pumping, and stopping leakage by utilizing the water pressure to bring the mixture to the leakage joint;
and seventhly, sealing the bottom with concrete, after the steel support system is installed, excavating, sucking mud and clearing the foundation of the pit bottom by adopting a long-arm excavator matched with a grab bucket and a mud sucking machine, excavating to the designed elevation of the bottom sealing concrete, and then performing dry sealing or underwater bottom sealing according to the specific conditions of the pit bottom, and further cleaning the periphery of the constructed pile foundation before performing underwater bottom sealing so as to ensure that the bottom sealing concrete is tightly combined with the pile foundation.
2. The steel sheet pile cofferdam construction process of claim 1, wherein: in the first step, the examination is performed through the following aspects:
(1) whether the pile body is deformed or not and whether the two ends are cracked or curled or not;
(2) whether the locking notch is broken, twisted, defected, partially bent and welded with welding slag;
(3) whether the type widths of the steel sheet piles are consistent or not;
(4) and whether the bending phenomenon of different degrees exists.
3. The steel sheet pile cofferdam construction process of claim 1, wherein: in the third step, when the steel sheet piles are inserted and driven, the steel sheet piles are inspected and repaired before insertion and driving so that the steel sheet piles have no crack, distortion, local deformation, welding beading and the like of the locking opening, butter is coated in the locking opening seam, all holes in the steel sheet piles need to be firmly repaired by steel sheet electric welding, the locking opening is smooth inside and outside and is in a straight line, the welding seams need to be staggered during insertion and driving, the corner piles can be split along the center line of the length direction of one steel sheet pile and connected to another steel sheet pile by adopting a mechanical means according to the shape of the cofferdam, and the steel sheet piles are processed into special-shaped piles with any angles on site.
4. The steel sheet pile cofferdam construction process of claim 1, wherein: in the third step, the steel sheet pile inserting and driving needs to check whether the position of the driven steel sheet pile is accurate or not and whether the verticality is qualified or not by taking the guide beam as the standard at any time, deviation rectification is timely implemented, in the driving process of the whole steel sheet pile cofferdam, one steel sheet pile is inserted and driven at the beginning, namely, each steel sheet pile is driven to the designed position, when the last 5 steel sheets are left, the steel sheet pile is inserted and driven firstly, if the steel sheet pile is folded by mistake, the steel sheet pile is folded by pulling with a chain block or a trolley group, and after folding, the steel sheet pile is driven to the designed depth one by one.
5. The steel sheet pile cofferdam construction process of claim 1, wherein: in the fourth step, when the steel sheet piles are folded for construction, in order to facilitate folding, 10-15 steel sheet piles adjacent to a folding port are inserted to the stable height of the piles firstly, adjustment of the steel sheet piles is mainly facilitated, two piles at the folding position are high and low, pile insertion is facilitated, after folding, the piles are driven to the designed elevation, the square steel cofferdam has 4 faces, each driven steel sheet pile is perpendicular to the tangent direction along the normal line of the guide frame, in order to prevent the two piles at the folding position from being not in the same plane, the direction of the corner pile is adjusted, and one locking port of the corner pile is kept parallel to the locking port of the opposite steel sheet pile as far as possible.
6. The steel sheet pile cofferdam construction process of claim 1, wherein: in the sixth step, during the anti-seepage and leak-stopping treatment, a local concrete bottom sealing measure is adopted at the water leakage position of the pile foot of the steel sheet pile; when the leakage is seriously blocked and the leakage is difficult, a magnetic water stop strip is stuck on the outer side of the joint of the two steel sheet piles; or color strip cloth is paved along the outer side of the steel sheet pile.
7. The steel sheet pile cofferdam construction process of claim 1, wherein: in the seventh step, when the bottom sealing concrete is excavated to the designed elevation, if a large amount of water burst does not appear in the cofferdam and the seawater can be pumped out, the bottom sealing can be carried out by a dry method; if a large amount of water gushes and seawater cannot be pumped out completely, immediately stopping construction, discharging water into the cofferdam, and sealing the bottom by adopting underwater concrete; and if the water inflow is large and the measured value of the axial force of the inner support exceeds the designed warning value in the processes of pumping water and installing the inner support, stopping construction, returning water to the cofferdam, and adopting underwater concrete bottom sealing.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113605421A (en) * | 2021-07-12 | 2021-11-05 | 中交路桥华南工程有限公司 | Method for mounting steel sheet pile |
| CN114645521A (en) * | 2022-03-28 | 2022-06-21 | 中电建十一局工程有限公司 | Construction method for existing reservoir emergency water drainage hole inlet |
| CN114775664A (en) * | 2022-05-24 | 2022-07-22 | 中铁一局集团有限公司 | Steel sheet pile cofferdam construction method for deep foundation pit and steel sheet pile cofferdam |
| CN114922210A (en) * | 2022-05-30 | 2022-08-19 | 广东省源天工程有限公司 | Island-building cofferdam construction platform structure |
| CN115288172A (en) * | 2022-08-30 | 2022-11-04 | 广东海外建设咨询有限公司 | River cofferdam construction method in bridge construction |
| CN115748768A (en) * | 2022-11-01 | 2023-03-07 | 中国建筑第七工程局有限公司 | Construction method of steel sheet pile cofferdam for underwater pile foundation |
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| CN113605421A (en) * | 2021-07-12 | 2021-11-05 | 中交路桥华南工程有限公司 | Method for mounting steel sheet pile |
| CN114645521A (en) * | 2022-03-28 | 2022-06-21 | 中电建十一局工程有限公司 | Construction method for existing reservoir emergency water drainage hole inlet |
| CN114645521B (en) * | 2022-03-28 | 2024-02-13 | 中电建十一局工程有限公司 | Construction method for import of emergency water discharge hole of existing reservoir |
| CN114775664A (en) * | 2022-05-24 | 2022-07-22 | 中铁一局集团有限公司 | Steel sheet pile cofferdam construction method for deep foundation pit and steel sheet pile cofferdam |
| CN114922210A (en) * | 2022-05-30 | 2022-08-19 | 广东省源天工程有限公司 | Island-building cofferdam construction platform structure |
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