CN111411638B - Steel sheet pile cofferdam and construction method thereof - Google Patents
Steel sheet pile cofferdam and construction method thereof Download PDFInfo
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- CN111411638B CN111411638B CN202010358097.9A CN202010358097A CN111411638B CN 111411638 B CN111411638 B CN 111411638B CN 202010358097 A CN202010358097 A CN 202010358097A CN 111411638 B CN111411638 B CN 111411638B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 83
- 239000010959 steel Substances 0.000 title claims abstract description 83
- 238000010276 construction Methods 0.000 title claims abstract description 53
- 230000008093 supporting effect Effects 0.000 claims abstract description 154
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000002689 soil Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 description 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 8
- 230000002349 favourable effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
Abstract
The invention provides a steel sheet pile cofferdam and a construction method thereof, belonging to the technical field of bridge construction, wherein the steel sheet pile cofferdam comprises a first cofferdam layer, a second cofferdam layer, a first supporting layer and a second supporting layer, and the top of the first cofferdam layer is higher than the flat peak water level; the second cofferdam layer is arranged on the outer side of the first cofferdam layer, the bottom of the second cofferdam layer is higher than the bottom of the first cofferdam layer, and the top of the second cofferdam layer is higher than the flood season water level; the first supporting layers are arranged on the inner sides of the first cofferdam layers, and the first supporting layers are arranged at intervals along the height direction of the first cofferdam layers; the second supporting layer is provided with a plurality of second cofferdam layers on the inner side of the second cofferdam layer, the second supporting layers are arranged at intervals along the height direction of the second cofferdam layer, and the second supporting layer is positioned above the first supporting layer. The steel sheet pile cofferdam provided by the invention has strong stability, can effectively block the water level in the flood season, and reduces the construction cost.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a steel sheet pile cofferdam and a construction method thereof.
Background
The steel sheet pile cofferdam is a common method for bridge foundation construction, and is widely applied to bridge construction in recent years due to the advantages of high construction speed, low cost, high safety performance and the like.
The conventional size of the steel sheet pile is divided into 12m, 15m and 18m, but the steel sheet pile with the conventional size cannot effectively block water after the water level in the flood season rises in the construction process, long-size steel sheet piles are required to be installed, but the steel sheet piles with the size more than 18m are required to be obtained through whole customization, and the cost is high and the transportation is inconvenient; two conventional steel sheet piles can be welded to obtain a longer steel sheet pile, but the overall stress performance of the welded longer steel sheet pile is poor, the connection performance of a welding seam is not strong, the welding seam is easy to break, and the lower steel sheet pile cannot be pulled out.
Disclosure of Invention
The invention aims to provide a steel sheet pile cofferdam and a construction method thereof, and aims to solve the technical problems that the existing longer steel sheet pile is high in cost and inconvenient to transport, and the joint performance of a welded joint of two conventional steel sheet piles is insufficient and easy to break.
In order to achieve the above purpose, the invention adopts the following technical scheme: there is provided a steel sheet pile cofferdam comprising:
the top of the first cofferdam layer is higher than the flat peak water level;
the second cofferdam layer is arranged on the outer side of the first cofferdam layer, the bottom of the second cofferdam layer is higher than the bottom of the first cofferdam layer, and the top of the second cofferdam layer is higher than the flood season water level;
The first support layers are arranged on the inner side of the first cofferdam layer, and the first support layers are arranged at intervals along the height direction of the first cofferdam layer; and
The second supporting layer is arranged on the inner side of the second cofferdam layer, a plurality of second supporting layers are arranged at intervals along the height direction of the second cofferdam layer, and the second supporting layer is located above the first supporting layer.
As another embodiment of the present application, the first support layer includes:
The first side beam is of a frame structure and is connected with the first cofferdam layer;
the first support rods are arranged on the inner sides of the first side beams, and two ends of each first support rod are respectively fixedly arranged on two adjacent sides of each first side beam; and
The second support rods are arranged on the inner sides of the first side beams, and two ends of each second support rod are fixedly arranged on two opposite sides of the first side beams respectively.
As another embodiment of the present application, the second support layer includes:
the second side beam is of a frame structure and is connected with the second cofferdam layer;
the third support rods are arranged on the inner sides of the second side beams, and two ends of each third support rod are respectively fixedly arranged on two adjacent sides of the second side beams; and
And the fourth supporting rods are arranged on the inner sides of the second side beams, and two ends of each fourth supporting rod are respectively fixedly arranged on two opposite sides of the second side beams.
In another embodiment of the present application, a plurality of second support rods are provided, and a fifth support rod is vertically provided between two adjacent second support rods.
As another embodiment of the present application, the fifth support bars are disposed in a plurality, and the plurality of fifth support bars are disposed in the middle of the two adjacent second support bars.
In another embodiment of the present application, a plurality of fourth support rods are provided, and a sixth support rod is vertically provided between two adjacent fourth support rods.
As another embodiment of the present application, the sixth support bars are provided in a plurality, and the plurality of sixth support bars are provided in the middle of the adjacent two fourth support bars.
In another embodiment of the present application, a first fixing member for fixing the first supporting layer is disposed on an inner wall of the first cofferdam layer, and a second fixing member for fixing the second supporting layer is disposed on an inner wall of the second cofferdam layer.
As another embodiment of the present application, the first fixing member includes:
the first positive bracket is fixedly arranged on the inner wall of the first cofferdam layer; and
The first reverse bracket is fixedly arranged on the inner wall of the first cofferdam layer, and the first supporting layer is arranged between the first positive bracket and the first reverse bracket;
the second fixing member includes:
the second positive bracket is fixedly arranged on the inner wall of the second cofferdam layer; and
The second anti-bracket is fixedly arranged on the inner wall of the second cofferdam layer, and the second supporting layer is arranged between the second positive bracket and the second anti-bracket.
The steel sheet pile cofferdam provided by the invention has the beneficial effects that: compared with the prior art, the steel sheet pile cofferdam is characterized in that a first cofferdam layer is firstly installed before installation, then a second cofferdam layer is installed, filling soil and water in the cofferdam are cleaned, a second supporting layer and a first supporting layer are sequentially installed from top to bottom, and pouring construction of a pier body is gradually completed in the first cofferdam layer and the second cofferdam layer from bottom to top. In the steel sheet pile cofferdam provided by the invention, as the first cofferdam layer and the second cofferdam layer are arranged in a staggered way, the water level in the flood season can be effectively blocked, the first cofferdam layer and the second cofferdam layer are all constructed by adopting conventional steel sheet piles, and the lengthened steel sheet piles are not required to be customized or different steel sheet piles are not required to be welded, so that the construction cost is reduced, the problems of fracture and deformation of joints when the welded steel sheet piles are adopted are avoided, and the stability of the steel sheet pile cofferdam is enhanced.
The invention also provides a construction method of the steel sheet pile cofferdam, which is implemented by the steel sheet pile cofferdam and comprises the following steps:
Filling soil in the construction site of the pier body to build an island in the dry season, and tamping to form a plain filled island;
pouring a concrete filling pile;
The first cofferdam layer and the second cofferdam layer are sequentially arranged from inside to outside;
the second supporting layer and the first supporting layer are sequentially arranged from top to bottom;
Cleaning a pebble foundation bed at the river bottom to a designed elevation, pouring back cover concrete, and pumping out water;
pouring a bearing platform on the bottom sealing concrete;
and removing the first supporting layer and the second supporting layer by layer from bottom to top, and simultaneously pouring the pier body from bottom to top section by section at the top of the bearing platform.
The steel sheet pile cofferdam construction method provided by the invention has the beneficial effects that: compared with the prior art, the construction method of the steel sheet pile cofferdam has the advantages that the island is filled with soil in the dry season, the plain filled soil island is formed after tamping, then the concrete filling pile is poured, the first cofferdam layer and the second cofferdam layer are sequentially installed from inside to outside, the second supporting layer and the first supporting layer are sequentially installed from top to bottom, the pebble foundation bed at the river bottom is cleaned to the designed elevation, water is pumped out after the bottom sealing concrete is poured, the bearing platform is poured on the bottom sealing concrete, and the pier body is poured on the top of the bearing platform from bottom to top in a section-by-section mode. According to the construction method of the steel sheet pile cofferdam, construction is carried out in the closed environment formed inside the first cofferdam layer and the second cofferdam layer, and the first cofferdam layer and the second cofferdam layer are arranged in a staggered mode, so that the water level in the flood season can be effectively blocked by the second cofferdam layer, the construction progress is not influenced by the water level, and the construction efficiency of the pier body is improved; the first cofferdam layer and the second cofferdam layer are constructed by adopting conventional steel sheet piles, the lengthened steel sheet piles are not required to be customized or the different steel sheet piles are welded, the integrity is strong, the problem that the joints are broken and deformed when the welded steel sheet piles are adopted is avoided, the installation firmness of the first cofferdam layer and the second cofferdam layer is ensured, the stability of the steel sheet pile cofferdam is enhanced, the shaking or breaking of the steel sheet piles caused by overhigh water pressure is prevented, the occurrence of accidents is prevented, and the safety of constructors is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a front view structure of a steel sheet pile cofferdam provided by an embodiment of the present invention;
fig. 2 is a schematic side view structure of a steel sheet pile cofferdam provided by an embodiment of the present invention;
FIG. 3 is an enlarged schematic view of the structure A in FIG. 2;
fig. 4 is an enlarged schematic view of structure B in fig. 2;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 6 is a sectional view of the structure taken along the line B-B in fig. 1.
In the figure: 1. a first cofferdam layer; 2. the second cofferdam layer; 3. a first support layer; 301. a first side rail; 302. a first support bar; 303. a second support bar; 4. a second support layer; 401. a second side rail; 402. a third support bar; 403. a fourth support bar; 5. a fifth support bar; 6. a sixth support bar; 7. a first fixing member; 701. a first positive bracket; 702. a first counter bracket; 8. a second fixing member; 801. a second positive bracket; 802. a second counter bracket; 9. filling soil; 10. a pebble bed; 11. bearing platform; 12. filling piles; 13. flat peak water level; 14. water level in flood season; 15. pier body.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 6 together, a steel sheet pile cofferdam provided by the present invention will now be described. The steel sheet pile cofferdam comprises a first cofferdam layer 1, a second cofferdam layer 2, a first supporting layer 3 and a second supporting layer 4, wherein the top of the first cofferdam layer 1 is higher than a flat peak water level 13; the second cofferdam layer 2 is arranged on the outer side of the first cofferdam layer 1, the bottom of the second cofferdam layer 2 is higher than the bottom of the first cofferdam layer 1, and the top of the second cofferdam layer 2 is higher than the flood season water level 14; the first supporting layers 3 are arranged on the inner side of the first cofferdam layer 1, and the first supporting layers 3 are arranged at intervals along the height direction of the first cofferdam layer 1; the second supporting layer 4 is provided with a plurality of second cofferdam layers 2 inboard, and a plurality of second supporting layers 4 are arranged along the direction of height of second cofferdam layer 2 interval, and second supporting layer 4 is located the top of first supporting layer 3.
Compared with the prior art, the steel sheet pile cofferdam provided by the invention is characterized in that a first cofferdam layer 1 is firstly installed before the steel sheet pile cofferdam is installed, then a second cofferdam layer 2 is installed, filling soil and water in the steel sheet pile cofferdam are cleaned, a second supporting layer 4 and a first supporting layer 3 are sequentially installed from top to bottom, and then pouring construction of a pier body 15 is gradually completed in the first cofferdam layer 1 and the second cofferdam layer 2 from bottom to top. In the steel sheet pile cofferdam provided by the invention, as the first cofferdam layer 1 and the second cofferdam layer 2 are arranged in a staggered way, the water level in the flood season can be effectively blocked, the first cofferdam layer 1 and the second cofferdam layer 2 are all constructed by adopting conventional steel sheet piles, and lengthened steel sheet piles or different steel sheet piles are not required to be welded, so that the construction cost is reduced, the problems of fracture and deformation at joints when welding steel plates are adopted are avoided, and the stability of the steel sheet pile cofferdam is enhanced.
As a specific embodiment of the steel sheet pile cofferdam provided by the present invention, referring to fig. 6, a first supporting layer 3 includes a first side beam 301, a first supporting rod 302 and a second supporting rod 303, wherein the first side beam 301 is of a frame structure and is connected to a first cofferdam layer 1; the first support rods 302 are arranged on the inner sides of the first side beams 301, and two ends of each first support rod 302 are respectively fixedly arranged on two adjacent sides of the first side beams 301; the second support rod 303 is disposed inside the first side beam 301, and two ends of the second support rod 303 are respectively and fixedly disposed on two opposite sides of the first side beam 301. The first supporting layer 3 may be assembled and then installed in the first cofferdam layer 1, or the first side beam 301 may be installed in the first cofferdam layer 1, and then the first supporting rod 302 and the second supporting rod 303 are installed respectively; regardless of which mounting mode, a plurality of first supporting layers 3 are all installed in proper order from the top down, and first bracing piece 302 is fixed the four corners of first boundary beam 301, and second bracing piece 303 is fixed the middle part of first boundary beam 301, improves the stability of first boundary beam 301, is favorable to first supporting layer 3 to play the supporting role to the inside of first cofferdam layer 1, can increase the stability of first cofferdam layer 1, prevents that rivers from causing first cofferdam layer 1 to rock or fracture under the circumstances that the water pressure is great relatively turbulent or prevents that the normal clear of construction.
In this embodiment, preferably, the second supporting rods 303 are perpendicular to the length direction of the first cofferdam layer 1, the second supporting rods 303 are arranged in the middle of the first cofferdam layer 1, and the pier body 15 is cast in the areas on two sides respectively.
As a specific embodiment of the steel sheet pile cofferdam provided by the present invention, referring to fig. 5, the second supporting layer 4 includes a second side beam 401, a third supporting rod 402 and a fourth supporting rod 403, and the second side beam 401 is of a frame structure and is connected to the second cofferdam layer 2; the third support rod 402 is arranged on the inner side of the second side beam 401, and two ends of the third support rod 402 are respectively fixedly arranged on two adjacent sides of the second side beam 401; the fourth supporting rod 403 is disposed on the inner side of the second side beam 401, and two ends of the fourth supporting rod 403 are respectively and fixedly disposed on two opposite sides of the second side beam 401. The second supporting layer 4 may be assembled and then installed in the second cofferdam layer 2, or the second side beam 401 may be installed in the second cofferdam layer 2, and then the third supporting rod 402 and the fourth supporting rod 403 may be installed respectively; regardless of which mounting mode, a plurality of second supporting layers 4 are all installed in proper order from the top down, and the four corners of second boundary beam 401 are fixed to third bracing piece 402, and the middle part of fourth bracing piece 403 to second boundary beam 401 is fixed, improves the stability of second boundary beam 401, is favorable to second supporting layer 4 to play the supporting role to the inside of second cofferdam layer 2, can increase the stability of second cofferdam layer 2, prevents that rivers from being more turbulent or the water pressure is great under the condition second cofferdam layer 2 rocks or breaks, guarantees the normal clear of construction.
In this embodiment, the second supporting layer 4 is installed first, then the first supporting layer 3 is installed, preferably, the fourth supporting rod 403 is perpendicular to the length direction of the second cofferdam layer 2, the fourth supporting rod 403 is arranged in the middle of the second cofferdam layer 2, and the pier body 15 is cast in the areas on two sides respectively.
As a specific embodiment of the steel sheet pile cofferdam provided by the present invention, referring to fig. 6, a plurality of second supporting rods 303 are provided, and a fifth supporting rod 5 is vertically provided between two adjacent second supporting rods 303. Preferably, two second bracing pieces 303 are provided, and intermediate position between two second bracing pieces 303 is equipped with fifth bracing piece 5, and the middle part of two adjacent second bracing pieces 303 is fixed to fifth bracing piece 5, is favorable to second bracing piece 303 to fix the middle part of first boundary beam 301, and then promotes the stability of first cofferdam layer 1, prevents that rivers from causing first cofferdam layer 1 to rock or fracture under the great circumstances of water pressure relatively turbulence or water pressure, guarantees the normal clear of construction.
As a specific embodiment of the steel sheet pile cofferdam provided by the present invention, referring to fig. 6, a plurality of fifth supporting bars 5 are provided, and a plurality of fifth supporting bars 5 are provided at the middle portions of two adjacent second supporting bars 303. The more the number of the fifth supporting rods 5 is, the stronger the stability between two adjacent second supporting rods 303 is, the better the fixing effect of the second supporting rods 303 on the middle part of the first side sill 301 is, the stability of the first cofferdam layer 1 is ensured, the first cofferdam layer 1 is prevented from shaking or breaking under the condition that the water flow is turbulent or the water pressure is high, and the normal operation of construction is ensured.
In this embodiment, the plurality of fifth supporting rods 5 are parallel and arranged at intervals, the arrangement of the intervals can avoid that the second supporting rods 303 are inconvenient to bear the shake transmitted by the first boundary beam 301 due to the fact that the connecting area at a certain position on the two adjacent second supporting rods 303 is too large, the technical problem of easy damage is solved, and the stability between the two adjacent second supporting rods 303 is ensured.
As another embodiment, the fifth support rods 5 are arranged in a crossed manner, the fifth support rods 5 arranged in a crossed manner are also arranged in the middle of two adjacent second support rods 303, a plurality of triangular spaces are formed between the fifth support rods 5 arranged in a crossed manner, and according to the most stable characteristic of the triangles, the fifth support rods 5 arranged in the state can ensure that the two adjacent second support rods 303 are in the most stable state, so that the supporting effect of the second support rods 303 on the first side beams 301 is enhanced, and the stability of the first side beams 301 is enhanced.
As a specific embodiment of the steel sheet pile cofferdam provided by the present invention, referring to fig. 5, a plurality of fourth supporting bars 403 are provided, and a sixth supporting bar 6 is vertically provided between two adjacent fourth supporting bars 403. Preferably, two fourth bracing pieces 403 are provided, and intermediate position between two fourth bracing pieces 403 is equipped with sixth bracing piece 6, and sixth bracing piece 6 is fixed the middle part of two adjacent fourth bracing pieces 403, is favorable to fourth bracing piece 403 to fix the middle part of second boundary beam 401, and then promotes the stability of second cofferdam layer 2, prevents that rivers from causing second cofferdam layer 2 to rock or fracture under the great circumstances of water pressure relatively turbulence or water pressure, guarantees the normal clear of construction.
As a specific embodiment of the steel sheet pile cofferdam provided by the present invention, referring to fig. 5, a plurality of sixth supporting bars 6 are provided, and a plurality of sixth supporting bars 6 are provided at the middle portions of two adjacent fourth supporting bars 403. The more the number of the sixth support rods 6 is, the stronger the stability between two adjacent fourth support rods 403 is, the better the fixing effect of the fourth support rods 403 to the middle part of the second side beam 401 is, the stability of the second cofferdam layer 2 is ensured, the second cofferdam layer 2 is prevented from shaking or breaking under the condition that the water flow is more turbulent or the water pressure is larger, and the normal operation of construction is ensured.
In this embodiment, the plurality of sixth support rods 6 are parallel and are arranged at intervals, the arrangement of the intervals can avoid that the fourth support rods 403 are inconvenient to bear the shake transmitted by the second boundary beam 401 due to the fact that the connecting area at a certain position on the two adjacent fourth support rods 403 is too large, the technical problem of easy damage is solved, and the stability between the adjacent fourth support rods 403 is ensured.
As another embodiment, the sixth support rods 6 are disposed in a crossed manner, the sixth support rods 6 disposed in a crossed manner are also disposed in the middle of two adjacent fourth support rods 403, a plurality of triangular spaces are formed between the sixth support rods 6 disposed in a crossed manner, and according to the most stable characteristic of the triangle, the sixth support rods 6 disposed in this state can ensure that two adjacent fourth support rods 403 are in the most stable state, so as to enhance the supporting effect of the fourth support rods 403 on the second side beam 401, and increase the stability of the second side beam 401.
As a specific embodiment of the steel sheet pile cofferdam provided by the present invention, referring to fig. 1, 2 and 4, a first fixing member 7 for fixing the first supporting layer 3 is provided on the inner wall of the first cofferdam layer 1, and a second fixing member 8 for fixing the second supporting layer 4 is provided on the inner wall of the second cofferdam layer 2. The fixed height of the first support rod 302 relative to the first cofferdam layer 1 can be fixed through the first fixing piece 7, the unstable connection part of the first support layer 3 caused by gravity is prevented, the falling accident of the first support layer 3 is prevented, the construction safety is ensured, and meanwhile, the stability of the first cofferdam layer 1 is ensured; can fix the fixed height of second bracing piece 303 for second cofferdam layer 2 through second mounting 8, prevent that second supporting layer 4 from leading to the junction unstable because of gravity, guarantee construction safety in the emergence of the accident that prevents second supporting layer 4 to drop, guarantee the steadiness of second cofferdam layer 2.
As a specific embodiment of the steel sheet pile cofferdam provided by the present invention, referring to fig. 1,2 and 4, the first fixing member 7 includes a first positive bracket 701 and a first negative bracket 702, and the first positive bracket 701 is fixedly arranged on the inner wall of the first cofferdam layer 1; the first reverse bracket 702 is fixedly arranged on the inner wall of the first cofferdam layer 1, and the first supporting layer 3 is arranged between the first positive bracket 701 and the first reverse bracket 702. The first positive bracket 701 is arranged at the bottom of the first supporting layer 3, can play a role in bearing the first supporting layer 3, and prevents the first supporting layer 3 from falling accidents due to the action of gravity or the disconnection of the connecting part; the top of first supporting layer 3 is located to first anti bracket 702, can play the effect of location to first supporting layer 3, prevent that first supporting layer 3 from producing because first cofferdam layer 1 receives the impact of water and rocking and transmitting to first supporting layer 3 and leading to first supporting layer 3 position to produce the skew, through set up first anti bracket 702 and first positive bracket 701 respectively in the bottom at the top of first supporting layer 3, guarantee the stability of first supporting layer 3 in the direction of height, when optimizing the supporting effect to first cofferdam layer 1, improved construction environment's factor of safety.
The second fixing piece 8 comprises a second positive bracket 801 and a second negative bracket 802, and the second positive bracket 801 is fixedly arranged on the inner wall of the second cofferdam layer 2; the second anti-bracket 802 is fixedly arranged on the inner wall of the second cofferdam layer 2, and the second supporting layer 4 is arranged between the second positive bracket 801 and the second anti-bracket 802. The second positive bracket 801 is arranged at the bottom of the second supporting layer 4, can play a role in bearing the second supporting layer 4, and prevents the second supporting layer 4 from falling off due to the action of gravity or the disconnection of the connecting part; the second anti-bracket 802 is located the top of second supporting layer 4, can play the effect of location to second supporting layer 4, prevent that second supporting layer 4 from producing because second cofferdam layer 2 receives the impact of water and rocking the transmission to second supporting layer 4 and leading to second supporting layer 4 position to produce the skew, through set up second anti-bracket 802 and the positive bracket 801 of second respectively in the bottom at the top of second supporting layer 4, guarantee the stability of second supporting layer 4 in the direction of height, when optimizing the supporting effect to second cofferdam layer 2, improved construction environment's factor of safety.
The invention also provides a construction method of the steel sheet pile cofferdam. The construction method of the steel sheet pile cofferdam comprises the following steps: in the dry season, filling soil at the construction position of the pier body 15 to build islands, and tamping to form plain filled soil 9 islands; pouring a concrete filling pile 12; a first cofferdam layer 1 and a second cofferdam layer 2 are sequentially arranged from inside to outside; the second supporting layer 4 and the first supporting layer 3 are sequentially arranged from top to bottom; cleaning a pebble foundation bed 10 at the river bottom to a designed elevation, pouring back cover concrete, and pumping out water; pouring a bearing platform 11 on the bottom sealing concrete; the first supporting layer 3 and the second supporting layer 4 are removed layer by layer from bottom to top, and meanwhile, the pier body 15 is cast on top of the bearing platform 11 from bottom to top section by section.
Compared with the prior art, the construction method of the steel sheet pile cofferdam provided by the invention has the advantages that the island is filled with soil in the dry season, the island 9 filled with soil is formed after tamping, then the cast-in-place concrete pile 12 is poured, the first cofferdam layer 1 and the second cofferdam layer 2 are sequentially installed from inside to outside, the second supporting layer 4 and the first supporting layer 3 are sequentially installed from top to bottom, the pebble foundation bed 10 at the river bottom is cleaned to the designed elevation, water is pumped out after pouring the back cover concrete, the bearing platform 11 is poured on the back cover concrete, and the pier body 15 is poured from bottom to top in a section. According to the construction method of the steel sheet pile cofferdam, construction is carried out in the closed environment formed inside the first cofferdam layer 1 and the second cofferdam layer 2, and the first cofferdam layer 1 and the second cofferdam layer 2 are arranged in a staggered mode, so that the water level in the flood season can be effectively blocked by the second cofferdam layer 1, the construction progress is not influenced by the water level, and the construction efficiency of the pier body 15 is improved; the first cofferdam layer 1 and the second cofferdam layer 2 are constructed by adopting conventional steel sheet piles, the lengthened steel sheet piles are not required to be customized or different steel sheet piles are welded, the integrity is strong, the problem that the joints are broken and deformed when the welded steel sheet piles are adopted is avoided, the installation firmness of the first cofferdam layer 1 and the second cofferdam layer 2 is ensured, the stability of the steel sheet pile cofferdam is enhanced, the shaking or breaking of the steel sheet piles caused by overhigh water pressure is prevented, the occurrence of accidents is prevented, and the safety of constructors is ensured.
As a specific embodiment of the construction method of the steel sheet pile cofferdam provided by the present invention, referring to fig. 1 to 6, the above-mentioned steps of installing the second supporting layer 4 and the first supporting layer 3 sequentially from top to bottom include: A. a second supporting layer 4 is sequentially arranged on the inner wall of the second cofferdam layer 2 from top to bottom; B. the pebble bed 10 in the first cofferdam layer 1 is arranged at the designed elevation of the highest first supporting layer 3, and the first supporting layer 3 at the highest position is installed; C. and (3) repeating the step (B) and sequentially installing the first supporting layer (3) downwards. Preferably, three first supporting layers 3 are arranged on the first cofferdam layer 1. Three second supporting layers 4 are arranged on the second cofferdam layer 2, and as the second supporting layers 4 are positioned at the top of the plain fill 9, the graphic fill in the second cofferdam layer 2 does not need to be cleaned during installation, and the first to third second supporting layers 4 are sequentially installed from top to bottom; when the first supporting layer 3 is installed from top to bottom, the first supporting layer 3 is positioned in the height range of the plain fill 9, and the plain fill 9 in the first cofferdam layer 1 is cleaned to the design elevation of the first supporting layer 3 at the top, and then the first supporting layer 3 is installed; the next second first support layer 3 requires simultaneous cleaning of the filling and pebble bed 10 to the elevation of the second first support layer 3, and then installation; the third first support layer 3 is positioned in the height range of the pebble bed 10, and the pebble bed 10 is cleaned to the elevation of the third first support layer 3 during installation, and then the pebble bed is installed. Because the top of second cofferdam layer 2 is higher, and top sheet pile leaks outward easily because wind or other external force rock, lead to the embedded section of bottom unstable, consequently from the top down's installation second supporting layer 4, can fix the top of second cofferdam layer 2 earlier, then guarantee the stability of second cofferdam layer 2, just can carry out the installation of second supporting layer 4 and first supporting layer 3 of bottom afterwards, this work flow can guarantee the stability of second cofferdam layer 2, and then improves the steadiness of whole sheet pile cofferdam, be favorable to the pouring construction to pier shaft 15.
In this embodiment, the mounting process of the second supporting layer 4 specifically includes: the second positive bracket 801 is welded at regular intervals to the inner side design elevation of the second cofferdam layer 2, the bottom surface of the second side beam 401 is abutted on the second positive bracket 801, then the third support rod 402, the fourth support rod 403 and the sixth support rod 6 are sequentially installed on the second side beam 401 (or the second side beam 401, the third support rod 402, the fourth support rod 403 and the sixth support rod 6 are assembled and then installed on the second positive bracket 801), and finally the second reverse bracket 802 is installed for fixing.
The mounting process of the first support layer 3 specifically includes: a first positive bracket 701 is welded at regular intervals to the inner side design elevation of the first cofferdam layer 1, the bottom surface of the first side beam 301 is abutted against the first positive bracket 701, then the first support rod 302, the second support rod 303 and the fifth support rod 5 are sequentially installed on the first side beam 301 (or the first side beam 301, the first support rod 302, the second support rod 303 and the fifth support rod 5 may be assembled and then installed on the first positive bracket 701), and finally the first reverse bracket 702 is installed and fixed.
As a specific implementation mode of the steel sheet pile cofferdam construction method provided by the invention, the pebble foundation bed 10 for cleaning the river bottom is positioned to the designed elevation, and water is drained after bottom sealing concrete is poured, and the concrete construction method specifically comprises the following steps: cleaning the pebble foundation bed 10 in the first cofferdam layer 1 to the designed elevation of the bearing platform 11, cleaning downwards to the designed elevation of the bottom sealing concrete, pouring the bottom sealing concrete through underwater pouring C30 concrete, blocking the space in the first cofferdam layer 1 from water through the bottom sealing concrete, and pumping out the water in the first cofferdam layer 1, so that pouring construction of the pier body 15 can be started.
As a specific embodiment of the construction method of the steel sheet pile cofferdam provided by the present invention, referring to fig. 1 and 2, the pouring of the bearing platform 11 on the bottom sealing concrete specifically includes: installing a bearing platform 11 mould on the back cover concrete; after binding reinforcing steel bars of the bearing platform 11, finishing the installation with a die of the bearing platform 11; pouring concrete of the bearing platform 11 and then curing; and removing the die of the bearing platform 11, and filling backfilling at the gap between the bearing platform 11 and the first cofferdam layer 1.
As a specific embodiment of the construction method of the steel sheet pile cofferdam provided by the present invention, referring to fig. 1 and 2, the above-mentioned pouring pier body 15 from bottom to top on top of the bearing platform 11 comprises: removing the two second support layers 4 at the bottommost part; installing a mould of the pier body 15, binding reinforcing steel bars and installing the bound reinforcing steel bars in the mould; pouring concrete into the mould to finish maintenance; removing the mould, and burying backfill between the pier body 15 and the first cofferdam layer 1 or the second cofferdam layer 2 to the elevation of the top of the river bed; repeating the above steps until pouring of pier body 15 is completed. Preferably, three first supporting layers 3 are arranged on the first cofferdam layer 1, three second supporting layers 4 are arranged on the second cofferdam layer 2, and in the installation process, the third first supporting layer 3 and the second first supporting layer 3 are removed firstly, and a die of a first section pier body 15 is installed at the top of the bearing platform 11; binding reinforcing steel bars of the first section pier body 15 and finishing the installation between the reinforcing steel bars and the mold; pouring concrete of the first section pier body 15 and curing; removing the mould of the first section pier body 15, filling backfill at the gap between the first section pier body 15 and the first cofferdam layer 1, and filling the backfill to the elevation of the top of the river bed;
Removing the first supporting layer 3 and the third second supporting layer 4, and mounting a second section pier body 15 mould on the first section pier body 15; binding reinforcing steel bars of the second section pier body 15, finishing the installation with a mould, pouring concrete of the second section pier body 15, and curing; removing the second section pier body 15 mold;
removing the second supporting layer 4 and the first second supporting layer 4, installing a mould of the third section pier body 15 on the second section pier body 15, binding reinforcing steel bars of the third section pier body 15, installing the reinforcing steel bars and the mould, pouring concrete of the third section pier body 15, and curing; and removing the mould of the third section pier body 15, and continuing to construct other sections of the pier body 15 to finish the construction of all the pier bodies 15.
As a specific embodiment of the construction method of the steel sheet pile cofferdam provided by the present invention, after pouring the pier body 15 section by section from bottom to top on top of the bearing platform 11, the method further includes: and sequentially removing the second cofferdam layer 2 and the first cofferdam layer 1. Because the second cofferdam layer 2 is installed in the outside of first cofferdam layer 1, therefore demolish second cofferdam layer 2 and first cofferdam layer 1 in proper order when demolishing can reduce operating personnel's intensity of labour.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. Steel sheet pile cofferdam, its characterized in that includes:
the top of the first cofferdam layer is higher than the flat peak water level;
the second cofferdam layer is arranged on the outer side of the first cofferdam layer, the bottom of the second cofferdam layer is higher than the bottom of the first cofferdam layer, and the top of the second cofferdam layer is higher than the flood season water level;
The first support layers are arranged on the inner side of the first cofferdam layer, and the first support layers are arranged at intervals along the height direction of the first cofferdam layer; and
The second support layers are arranged on the inner sides of the second cofferdam layers and are arranged at intervals along the height direction of the second cofferdam layers, and the second support layers are positioned above the first support layers;
the first support layer includes:
The first side beam is of a frame structure and is connected with the first cofferdam layer;
the first support rods are arranged on the inner sides of the first side beams, and two ends of each first support rod are respectively fixedly arranged on two adjacent sides of each first side beam; and
The second support rods are arranged on the inner sides of the first side beams, and two ends of each second support rod are respectively fixedly arranged on two opposite sides of the first side beams;
The inner wall of the first cofferdam layer is provided with a first fixing piece used for fixing the first supporting layer, and the inner wall of the second cofferdam layer is provided with a second fixing piece used for fixing the second supporting layer.
2. A steel sheet pile cofferdam as set forth in claim 1, wherein said second supporting layer includes:
the second side beam is of a frame structure and is connected with the second cofferdam layer;
the third support rods are arranged on the inner sides of the second side beams, and two ends of each third support rod are respectively fixedly arranged on two adjacent sides of the second side beams; and
And the fourth supporting rods are arranged on the inner sides of the second side beams, and two ends of each fourth supporting rod are respectively fixedly arranged on two opposite sides of the second side beams.
3. A steel sheet pile cofferdam as claimed in claim 1, wherein a plurality of said second support bars are provided, and a fifth support bar is vertically provided between two adjacent said second support bars.
4. A steel sheet pile cofferdam as in claim 3 wherein said fifth support bars are provided in plural, and a plurality of said fifth support bars are provided in the middle of said adjacent two of said second support bars.
5. A steel sheet pile cofferdam as in claim 2, wherein said fourth support bars are provided in plural numbers, and a sixth support bar is vertically provided between two adjacent ones of said fourth support bars.
6. A steel sheet pile cofferdam as set forth in claim 5 wherein said sixth support bars are provided in plural, and a plurality of said sixth support bars are provided in the middle of said adjacent two of said fourth support bars.
7. A steel sheet pile cofferdam as set forth in claim 1, wherein said first fixing member includes:
the first positive bracket is fixedly arranged on the inner wall of the first cofferdam layer; and
The first reverse bracket is fixedly arranged on the inner wall of the first cofferdam layer, and the first supporting layer is arranged between the first positive bracket and the first reverse bracket;
the second fixing member includes:
the second positive bracket is fixedly arranged on the inner wall of the second cofferdam layer; and
The second anti-bracket is fixedly arranged on the inner wall of the second cofferdam layer, and the second supporting layer is arranged between the second positive bracket and the second anti-bracket.
8. A steel sheet pile cofferdam construction method, carried out by a steel sheet pile cofferdam as set forth in any one of claims 1 to 7, comprising the steps of:
Filling soil in the construction site of the pier body to build an island in the dry season, and tamping to form a plain filled island;
pouring a concrete filling pile;
The first cofferdam layer and the second cofferdam layer are sequentially arranged from inside to outside;
the second supporting layer and the first supporting layer are sequentially arranged from top to bottom;
Cleaning a pebble foundation bed at the river bottom to a designed elevation, pouring back cover concrete, and pumping out water;
pouring a bearing platform on the bottom sealing concrete;
and removing the first supporting layer and the second supporting layer by layer from bottom to top, and simultaneously pouring the pier body from bottom to top section by section at the top of the bearing platform.
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