Sludge coast high-pile wharf structure and construction method

Abstract

The invention belongs to the technical field of wharf construction, and relates to a mucky coast high-pile wharf structure and a construction method. The high-pile wharf structure comprises a high-pressure jet grouting pile wall, a plurality of cement mixing pile walls arranged in parallel and a plurality of rows of wharf pile foundations. Each cement mixing pile wall extends from the land area side to the sea area side, and the bottom of each cement mixing pile wall penetrates through the sludge layer and enters the hard foundation; the high-pressure jet grouting pile wall is arranged close to the land area side and extends in the direction parallel to the wharf shoreline, the top of the high-pressure jet grouting pile wall is higher than the water surface, the high-pressure jet grouting pile wall is connected with all the cement mixing pile walls, and the space between the high-pressure jet grouting pile wall and the rear land area is filled with foam light soil; a row of wharf pile foundations are arranged between every two adjacent cement mixing pile walls, each row of wharf pile foundations comprises a plurality of tubular piles which are arranged from the high-pressure jet grouting pile wall to the sea area side at intervals, the bottoms of the tubular piles penetrate through the sludge layer to enter the hard foundation, and the tops of the tubular piles are higher than the water surface. The bearing capacity of the muddy coast wharf foundation and the stability of the bank slope behind the wharf can be improved, the construction cost is reduced, and the construction period is shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of wharf construction, and particularly relates to a high-pile wharf structure and construction method on a silty coast. Background Art

[0002] The soil body on a silty coast has the characteristics of high compressibility, low bearing capacity and easy thixotropy. The natural strength of silt is low, and its undrained shear strength is usually less than 20 kPa. After the superimposition of backfill load, it is easy to exceed the bearing capacity of the soil body, resulting in shear failure; due to the large thickness and low strength of the silt layer, it is generally necessary to reinforce the foundation by means of sand cushion throwing, drainage plate driving, laying sand-filled geotextile bags, etc. to improve the bearing capacity.

[0003] The shear strength of the soil body on a silty coast is low, and it is easy to cause landslides due to dredging, pile driving or backfilling; at present, a slope-type shore connection structure or a sheet pile unloading platform is usually adopted, and combined with armor blocks to prevent scouring; or a box-cylinder wharf is combined with a dike, which has both soil retaining and berthing functions; however, whether a pipe-plate combined wharf structure or a box-cylinder wharf structure is adopted, the construction cost is expensive.

[0004] When constructing a high-pile wharf on a silty coast, it is usually necessary to remove a large amount of silt in the rear land area and replace it with sand; however, for areas with tight sand sources, this will inevitably increase the construction cost and construction period, and with the increasing protection of the marine environment by countries, the exploitation of backfill sand is becoming more and more difficult.

[0005] In view of this, it is necessary to further study the high-pile wharf structure and construction method on a silty coast. Summary of the Invention

[0006] Aiming at the deficiencies in the related technologies, the present invention provides a high-pile wharf structure and construction method on a silty coast, aiming to improve the bearing capacity of the foundation of the wharf on a silty coast, improve the stability of the rear shore slope of the wharf, reduce the dredging and replacement workload and the amount of backfill during the construction of the high-pile wharf on a silty coast, reduce the construction cost and shorten the construction period.

[0007] The present invention provides a high-pile wharf structure on a silty coast, including: A plurality of cement mixing pile walls arranged in parallel, each cement mixing pile wall extending from the land side of the rear of the wharf to the sea side of the front of the wharf; the cement mixing pile wall includes a plurality of mutually occluding cement mixing piles, and the bottom of the cement mixing pile penetrates through the silt layer and enters the hard base; A high-pressure jet grouting pile wall, the high-pressure jet grouting pile wall is arranged close to the land side of the rear of the wharf and extends along the direction parallel to the wharf shoreline, and the high-pressure jet grouting pile wall is connected to all the cement mixing pile walls; the high-pressure jet grouting pile wall includes a plurality of mutually occluding high-pressure jet grouting piles, and the top of the high-pressure jet grouting pile is higher than the water surface; foam lightweight soil is filled between the high-pressure jet grouting pile wall and the land area at the rear of the wharf; The multi - row wharf pile foundations are respectively arranged between two adjacent cement mixing pile walls. Each row of wharf pile foundations includes multiple pipe piles. The multiple pipe piles are arranged at intervals from the high - pressure jet grouting pile wall towards the sea area in front of the wharf. The bottom of the pipe pile penetrates through the silt layer and enters the hard foundation, and its top is above the water surface. The wharf deck structure is arranged on the top surfaces of all rows of wharf pile foundations. The stacking surface layer is arranged on the top surfaces of the land area behind the wharf, the foam lightweight soil and the high - pressure jet grouting pile wall, and is smoothly connected to the wharf deck structure.

[0008] In some embodiments, a counterfort - type wave - blocking block is provided at the connection of each cement mixing pile wall and the high - pressure jet grouting pile wall. The counterfort - type wave - blocking block includes a bottom plate and a side plate that are connected to form an L - shape, and multiple rib plates that are obliquely supported between the bottom plate and the side plate. The bottom plate is connected to the top surface of the cement mixing pile wall, and the side plate abuts against the side wall of the high - pressure jet grouting pile wall facing the sea area in front of the wharf.

[0009] In some embodiments, within the height section where the high - pressure jet grouting pile wall is higher than the cement mixing pile wall, I - shaped steel is inserted into every other high - pressure jet grouting pile.

[0010] In some embodiments, a plurality of drainage plates are inserted into the silt layer between the high - pressure jet grouting pile wall and the land area behind the wharf.

[0011] In some embodiments, the cement mixing pile is a four - axis deep - layer cement mixing pile; the high - pressure jet grouting pile is a two - axis or four - axis high - pressure jet grouting pile; the pipe pile is a steel pipe pile, a concrete pipe pile or a steel - concrete composite pile.

[0012] The present invention also provides a construction method for the above - mentioned high - pile wharf structure on the muddy coast, including the following steps: S1. According to the design requirements, locally dredge the original mud surface of the silt layer. S2. Drive cement mixing piles along the direction perpendicular to the wharf shoreline to form cement mixing pile walls; complete the construction of all cement mixing pile walls in this way. S3. Backfill plain soil near the land area behind the wharf to form a temporary earth dam. The temporary earth dam extends along the direction parallel to the wharf shoreline and its length is greater than the spacing between the two outermost cement mixing pile walls. The top of the temporary earth dam is above the water surface. S4. Drive high - pressure jet grouting piles along the direction parallel to the wharf shoreline on the temporary earth dam to form a high - pressure jet grouting pile wall connected to all cement mixing pile walls; within the height section where the high - pressure jet grouting pile wall is higher than the cement mixing pile wall, insert I - shaped steel into every other high - pressure jet grouting pile. S5. Lay medium and coarse sand on the top surface of the silt layer between the high-pressure jet grouting pile wall and the land area behind the wharf, then drive multiple drainage plates into the silt layer at this location, and drain the silt layer by means of vacuum preloading or / and surcharge preloading; S6. Excavate the temporary earth dam on the side of the high-pressure jet grouting pile wall facing the sea area in front of the wharf; S7. Between two adjacent cement mixing pile walls, drive multiple pipe piles at intervals from the high-pressure jet grouting pile wall to the sea area in front of the wharf along the direction perpendicular to the wharf shoreline to form multiple rows of wharf pile foundations; S8. Install a counterfort type wave-blocking block at the connection of each cement mixing pile wall and the high-pressure jet grouting pile wall; S9. Backfill lightweight foamed soil between the high-pressure jet grouting pile wall and the land area behind the wharf; S10. Construct the superstructure of the wharf on all rows of wharf pile foundations. The superstructure of the wharf includes pile caps, cross beams, tie beams, and wharf deck structures; construct the stacking surface layer on the top surfaces of the land area behind the wharf, lightweight foamed soil, and high-pressure jet grouting pile wall, and make the stacking surface layer connect smoothly with the wharf deck structure.

[0013] In some embodiments, multiple through holes are reserved on the bottom plate of the counterfort type wave-blocking block; in step S8, drill multiple connecting holes on the cement mixing pile wall corresponding to the multiple through holes, insert steel pipes into the connecting holes through the through holes, and then pour cement mortar into the through holes and the connecting holes to install the counterfort type wave-blocking block on the cement mixing pile wall; the depth of the connecting holes is 2m - 4m.

[0014] In some embodiments, in step S2, the bottom of the cement mixing pile penetrates through the silt layer and enters the hard base by 2m - 3m.

[0015] In some embodiments, in step S4, at the wall section of the high-pressure jet grouting pile wall corresponding to the cement mixing pile wall, the bottom of the high-pressure jet grouting pile enters the cement mixing pile by 0.5m - 1m; at the wall section of the high-pressure jet grouting pile wall not corresponding to the cement mixing pile wall, the bottom of the high-pressure jet grouting pile penetrates through the silt layer and enters the hard base by 2m - 3m.

[0016] In some embodiments, in step S7, the bottom of the pipe pile penetrates through the silt layer and enters the hard base at a preset depth.

[0017] Based on the above technical solutions, the silt coast high-pile wharf structure and construction method in the embodiments of the present invention can significantly improve the bearing capacity of the foundation of the silt coast wharf, reduce the dredging and replacement workload and the amount of backfill during the construction of the silt coast high-pile wharf, reduce the construction cost, shorten the construction period, and significantly improve the stability of the shore slope behind the wharf, which is beneficial to increasing the overall draft depth of the silt coast and can be applied to the construction of deep-water wharves. Description of the Drawings

[0018] The accompanying drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is a sectional view of the high-pile wharf structure on the muddy coast of the present invention; Figure 2 is a plan layout drawing of the cement mixing pile wall, high-pressure jet grouting pile wall and wharf pile foundation in the high-pile wharf structure on the muddy coast of the present invention; Figure 3 is a sectional view of the counterfort type wave-blocking block in the high-pile wharf structure on the muddy coast of the present invention; Figure 4 is a top view of the counterfort type wave-blocking block in the high-pile wharf structure on the muddy coast of the present invention; Figure 5 is a flow chart of the construction method of the high-pile wharf structure on the muddy coast of the present invention; Figure 6 is a schematic diagram before construction on the muddy coast; Figure 7 is a schematic diagram of step S1 in the construction method of the high-pile wharf structure on the muddy coast of the present invention; Figure 8 is a schematic diagram of step S2 in the construction method of the high-pile wharf structure on the muddy coast of the present invention; Figure 9 is a schematic diagram of step S3 in the construction method of the high-pile wharf structure on the muddy coast of the present invention; Figure 10 is a schematic diagram of step S4 in the construction method of the high-pile wharf structure on the muddy coast of the present invention; Figure 11 is a schematic diagram of steps S5 and S6 in the construction method of the high-pile wharf structure on the muddy coast of the present invention; Figure 12 is a schematic diagram of step S7 in the construction method of the high-pile wharf structure on the muddy coast of the present invention; Figure 13 is a schematic diagram of steps S8 and S9 in the construction method of the high-pile wharf structure on the muddy coast of the present invention.

[0019] In the drawings: 10. Cement mixing pile wall; 11. Cement mixing pile; 20. High-pressure jet grouting pile wall; 21. High-pressure jet grouting pile; 22. I-beam; 30. Wharf pile foundation; 31. Pipe pile; 50. Wharf surface structure; 60. Stacking surface layer; 70. Counterfort type wave-blocking block; 71. Bottom slab; 72. Side slab; 73. Rib plate; 74. Through hole; 81. Drainage board; 82. Temporary earth dam; 83. Foamed lightweight soil. Detailed implementation manners

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "transverse", "longitudinal", "upper", "lower", "top", "bottom", "inner", "outer", "left", "right", "front", "rear", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] Reference Figures 1-4 As shown, the present invention provides a high-pile wharf structure for muddy coasts, which includes a high-pressure jet grouting pile wall 20, a plurality of cement mixing pile walls 10, and multiple rows of wharf pile foundations 30.

[0024] The plurality of cement mixing pile walls 10 are arranged in parallel; each cement mixing pile wall 10 extends from the land side behind the wharf to the sea side in front of the wharf, that is, each cement mixing pile wall 10 extends along a direction perpendicular to the wharf shoreline. The cement mixing pile wall 10 includes a plurality of mutually interlocking cement mixing piles 11, and the bottom of the cement mixing pile 11 passes through the soft soil foundation of the silt layer and enters the hard base below the silt layer; it can be understood that the cement mixing piles 11 are driven into the soft soil foundation of the silt layer of the muddy coast, and the top surface of the cement mixing pile 11 is flush with the top mud surface of the silt layer.

[0025] The high-pressure jet grouting pile wall 20 is arranged close to the land side behind the wharf, and the high-pressure jet grouting pile wall 20 extends along the direction parallel to the wharf shoreline; the high-pressure jet grouting pile wall 20 is connected to all the cement mixing pile walls 10. The high-pressure jet grouting pile wall 20 includes a plurality of high-pressure jet grouting piles 21 that are mutually occluded, and the tops of the high-pressure jet grouting piles 21 are above the water surface, that is, the top surfaces of the high-pressure jet grouting piles 21 are higher than the top surfaces of the cement mixing piles 11. The foam lightweight soil 83 is filled between the high-pressure jet grouting pile wall 20 and the land behind the wharf, and the high-pressure jet grouting pile wall 20 functions as a soil retaining structure.

[0026] A row of wharf pile foundations 30 are provided between every two adjacent cement mixing pile walls 10; each row of wharf pile foundations 30 includes a plurality of pipe piles 31, and the plurality of pipe piles 31 are arranged at intervals from the high-pressure jet grouting pile wall 20 towards the sea side in front of the wharf. The bottoms of the pipe piles 31 penetrate through the silt layer and enter the hard base, and the tops of the pipe piles 31 are above the water surface.

[0027] Further, the wharf surface structure 50, as a part of the upper structure of the wharf, is arranged on the top surfaces of all rows of wharf pile foundations 30; the stacking surface layer 60 is arranged on the land behind the wharf, the top surfaces of the foam lightweight soil 83 and the high-pressure jet grouting pile wall 20, and is smoothly connected to the wharf surface structure 50.

[0028] In the above-mentioned exemplary embodiment, through the arrangement of a plurality of cement mixing pile walls 10, the foundation of the silt coast wharf is effectively reinforced, the characteristics of the foundation soil are improved, and the bearing capacity of the foundation of the silt coast wharf is significantly increased. Thus, the dredging and backfilling work volume and the amount of backfill during wharf construction can be reduced, the construction cost can be lowered, and the construction period can be shortened; through the arrangement of the high-pressure jet grouting pile wall 20 and the filling of the foam lightweight soil 83 between the high-pressure jet grouting pile wall 20 and the land behind, the earth pressure behind the wharf is reduced, and the stability of the back slope of the wharf is improved.

[0029] Reference Figure 1 、 Figure 3 、 Figure 4 、 Figure 13As shown, in some embodiments, at the connection of each cement mixing pile wall 10 and the high-pressure jet grouting pile wall 20, a counterfort wave-blocking block 70 is provided. The counterfort wave-blocking block 70 includes a bottom plate 71 and a side plate 72 that are connected to form an L shape, and a plurality of rib plates 73 that are obliquely supported between the bottom plate 71 and the side plate 72; wherein, the bottom plate 71 is connected to the top surface of the cement mixing pile wall 10, and the side plate 72 abuts against the side wall of the high-pressure jet grouting pile wall 20 facing the sea area in front of the wharf; further, the dimensions of the bottom plate 71 and the side plate 72 in the direction parallel to the wharf shoreline are greater than the thickness of the cement mixing pile wall 10 to increase the abutting area between the counterfort wave-blocking block 70 and the high-pressure jet grouting pile wall 20. Through the setting of the counterfort wave-blocking block 70 in this illustrative embodiment, it can provide support for the cantilever section where the high-pressure jet grouting pile wall 20 is higher than the cement mixing pile wall 10, and has both the functions of retaining and wave-blocking, enhancing the ability of the high-pressure jet grouting pile wall 20 to resist the earth pressure behind the wharf, further improving the stability of the shore slope behind the wharf, and enhancing the anti-wave scouring ability of the high-pressure jet grouting pile wall 20.

[0030] Reference Figure 1 、 Figure 2 、 Figure 10 As shown, in some embodiments, within the height section where the high-pressure jet grouting pile wall 20 is higher than the cement mixing pile wall 10, that is, at the cantilever section where the high-pressure jet grouting pile wall 20 is higher than the cement mixing pile wall 10, I-beams 22 are inserted into the high-pressure jet grouting piles 21 at every other pile, thereby forming a composite pile wall structure of high-pressure jet grouting piles 21 + I-beams 22, improving the strength and stability of the high-pressure jet grouting pile wall 20, and further enhancing the stability of the shore slope behind the wharf.

[0031] Reference Figure 1 、 Figure 11 As shown, in some embodiments, a plurality of drainage plates 81 are inserted into the silt layer between the high-pressure jet grouting pile wall 20 and the land area behind the wharf for draining the silt layer in this interval. The drainage method adopted can be vacuum preloading drainage or / and surcharge preloading, etc., which is not limited here; thereby, the soft soil foundation of the silt layer between the high-pressure jet grouting pile wall 20 and the land area behind the wharf can be reinforced, which is conducive to improving the backfilling effect and stability of the subsequent foamed lightweight soil 83.

[0032] Reference Figure 2 As shown, in some embodiments, the cement mixing piles 11 are four-axis deep cement mixing piles, and the high-pressure jet grouting piles 21 are two-axis high-pressure jet grouting piles or four-axis high-pressure jet grouting piles; thereby, the construction efficiency and pile-forming quality can be improved, which is beneficial to improving the overall strength and stability of the cement mixing pile wall 10 and the high-pressure jet grouting pile wall 20, and shortening the construction period. Each pipe pile 31 in the wharf pile foundation 30 is a steel pipe pile, a concrete pipe pile, or a steel pipe concrete composite pile.

[0033] Reference Figures 1-13As shown in the figure, the present invention also provides a construction method for the above-mentioned high-piled wharf structure on muddy coast, and this construction method includes the following steps: S1. According to the design requirements, such as slope design, etc., local dredging is carried out on the original mud surface of the mud layer on the muddy coast.

[0034] S2. The piling barge is in place according to the design drawings, and a plurality of cement mixing piles 11 that are mutually occluded are driven along the direction perpendicular to the wharf shoreline from the land side behind the wharf to the sea side in front or from the sea side in front of the wharf to the land side behind the wharf to form a cement mixing pile wall 10; the construction of all the cement mixing pile walls 10 is completed in this way. Specifically, the top surface of the cement mixing pile 11 is flush with the top mud surface of the mud layer, and the bottom of the cement mixing pile 11 penetrates through the mud layer and enters the hard base by 2 m to 3 m; the cement mixing pile 11 can be a four-axis deep cement mixing pile, which is driven by a special ship for four-axis deep cement mixing piles, and the single pile diameter in the four-axis deep cement mixing pile can be set to 1.2 m to 1.8 m, and the inter-pile occluding length can be set to 0.2 m.

[0035] Further, the cement mixing pile 11 adopts the "two mixing and one spraying" bidirectional mixing pile construction process, and the specific process is as follows: S21. The pile driver is in place: the mixer reaches the designated pile position and is centered. S22. Sinking and mixing: While opening the ash feeding pump to spray cement powder into the soil body, the two groups of blades rotate forward and backward simultaneously and sink until the design depth. S23. Lifting and mixing: Close the ash feeding pump, and the two groups of blades rotate forward and backward simultaneously to mix until the pile top surface, and the construction of the cement mixing pile 11 is completed.

[0036] S3. Backfill plain soil at the place near the land side behind the wharf, that is, at the rear line of the wharf, to form a temporary earth dam 82; the temporary earth dam 82 extends along the direction parallel to the wharf shoreline and its length is greater than the distance between the outermost two cement mixing pile walls 10, and the top of the temporary earth dam 82 is higher than the water surface.

[0037] S4. On the temporary earth dam 82, high-pressure jet grouting piles 21 are driven along the direction parallel to the wharf shoreline in a land construction manner to form a high-pressure jet grouting pile wall 20 connected to all the cement mixing pile walls 10. Specifically, the high-pressure jet grouting pile 21 can be a double-axis high-pressure jet grouting pile or a four-axis high-pressure jet grouting pile, and its single pile diameter can be set to 1.2 m to 1.8 m, and the inter-pile mutual occluding length can be set to 0.2 m.

[0038] Further explanation: The top surface of the high-pressure jet grouting pile wall 20 is flush with the top surface of the temporary earth embankment 82, that is, the top of the high-pressure jet grouting pile 21 is above the water surface, and the top surface of the high-pressure jet grouting pile 21 is also higher than the top surface of the cement mixing pile 11. At the corresponding wall section of the high-pressure jet grouting pile wall 20 and the cement mixing pile wall 10, that is, at the position where the cement mixing pile 11 has been driven, the bottom of the high-pressure jet grouting pile 21 enters the cement mixing pile 11 by 0.5 m to 1 m; at the wall section of the high-pressure jet grouting pile wall 20 that does not correspond to the cement mixing pile wall 10, that is, at the position where the cement mixing pile 11 has not been driven between two adjacent cement mixing pile walls 10, the bottom of the high-pressure jet grouting pile 21 penetrates through the silt layer and enters the hard base by 2 m to 3 m. Thereby, the connection strength and stability between the high-pressure jet grouting pile wall 20 and the cement mixing pile wall 10 are improved.

[0039] Further, after the construction of the high-pressure jet grouting pile wall 20 is completed, within the height section where the high-pressure jet grouting pile wall 20 is higher than the cement mixing pile wall 10, that is, at the cantilever section where the high-pressure jet grouting pile wall 20 is higher than the cement mixing pile wall 10, I-beams 22 are inserted into the high-pressure jet grouting piles 21 at every other pile. The length of the I-beam 22 is not less than the height of the cantilever section, thereby forming a composite pile wall structure of the high-pressure jet grouting pile 21 + I-beam 22, improving the strength and stability of the high-pressure jet grouting pile wall 20, and further improving the stability of the back slope of the wharf.

[0040] S5. Lay medium-coarse sand on the top surface of the silt layer between the high-pressure jet grouting pile wall 20 and the back land area of the wharf, and then drive a plurality of drainage boards 81 into the silt layer at this place, and drain the silt layer at this place by means of vacuum preloading or / and surcharge preloading, etc., so as to reinforce the soft soil foundation of the silt layer at this place.

[0041] S6. Excavate the temporary earth embankment 82 on the side of the high-pressure jet grouting pile wall 20 facing the sea area in front of the wharf.

[0042] S7. The piling barge is in place. Between two adjacent cement mixing pile walls 10, a plurality of pipe piles 31 are driven at intervals in the direction perpendicular to the wharf shoreline from the high-pressure jet grouting pile wall 20 to the sea area in front of the wharf, so as to form multiple rows of wharf pile foundations 30. Specifically, the pipe pile 31 can be a steel pipe pile or a concrete pipe pile, and the bottom of the pipe pile 31 penetrates through the silt layer and enters the hard base at a preset depth. Further, when constructing multiple rows of wharf pile foundations 30, first drive the middle row of wharf pile foundations 30, and then drive the other rows of wharf pile foundations 30 in sequence to both sides; for each row of wharf pile foundations 30, a plurality of pipe piles 31 are driven in sequence from the high-pressure jet grouting pile wall 20 to the sea area in front of the wharf.

[0043] S8. Install a counterfort wave-blocking block 70 at the connection of each cement mixing pile wall 10 and the high-pressure jet grouting pile wall 20, so that the side surface of the counterfort wave-blocking block 70 abuts against the side wall of the high-pressure jet grouting pile wall 20 facing the sea area in front of the wharf, and the bottom surface of the counterfort wave-blocking block 70 is connected to the cement mixing pile wall 10.

[0044] S9. Backfill lightweight foamed soil 83 between the high-pressure jet grouting pile wall 20 and the land area behind the wharf, that is, dump the lightweight foamed soil 83 on the silt layer that has been drained and consolidated in step S5; the backfill of the lightweight foamed soil 83 is beneficial to reducing the unit weight of the backfill soil, reducing the earth pressure behind the wharf, and improving the stability of the slope behind the wharf.

[0045] S10. Construct the superstructure of the wharf on all rows of wharf pile foundations 30. The superstructure of the wharf includes pile caps, cross beams, tie beams, wharf deck structure 50, etc. Construct the stacking surface layer 60 on the land area behind the wharf, the lightweight foamed soil 83 and the top surface of the high-pressure jet grouting pile wall 20, and make the stacking surface layer 60 connect smoothly with the wharf deck structure 50. The specific construction methods of the superstructure of the wharf and the stacking surface layer 60 on the land area side behind the wharf are well known to those skilled in the art and will not be elaborated here.

[0046] The above-mentioned illustrative embodiments refine the construction steps of the high-piled wharf structure on the muddy coast, significantly improve the bearing capacity of the foundation of the wharf on the muddy coast, significantly improve the stability of the slope behind the wharf, reduce the dredging and replacement workload and the amount of backfill during the construction of the high-piled wharf on the muddy coast, reduce the construction cost, and shorten the construction period.

[0047] Reference Figure 1 、 Figure 3 、 Figure 4 As shown in [references], in some embodiments, a plurality of through holes 74 are reserved on the bottom plate 71 of the counterfort type wave-blocking block 70. In step S8, it specifically includes the following steps: S81. Hoist each counterfort type wave-blocking block 70 one by one to the top of each cement mixing pile wall 10, and make its side abut against the side wall of the high-pressure jet grouting pile wall 20 facing the sea area in front of the wharf; S82. Use a geological drill to drill a plurality of connecting holes on the cement mixing pile wall 10 that correspond one by one to the plurality of through holes 74 on the counterfort type wave-blocking block 70. The depth of the connecting holes on the cement mixing pile wall 10 is 2m to 4m; S83. Insert steel pipes into the connecting holes through the through holes 74, and then pour cement mortar into the through holes 74 and the connecting holes to connect the steel pipes, the counterfort type wave-blocking block 70 and the cement mixing pile wall 10 into one body, so as to install the counterfort type wave-blocking block 70 on the cement mixing pile wall 10.

[0048] The above-mentioned illustrative embodiments realize the reliable installation of the counterfort type wave-blocking block 70 on the cement mixing pile wall 10, and can thus provide strong support for the cantilever section where the high-pressure jet grouting pile wall 20 is higher than the cement mixing pile wall 10, enhance the ability of the high-pressure jet grouting pile wall 20 to resist the earth pressure behind the wharf, and further improve the stability of the slope behind the wharf.

[0049] Through the description of multiple embodiments of the high-piled wharf structure and construction method on muddy coast of the present invention, it can be seen that the present invention has at least one or more of the following advantages: 1) By driving a plurality of cement mixing pile walls 10 in the soft soil foundation of the silt layer, the foundation of the wharf on the muddy coast is effectively reinforced, the characteristics of the foundation soil are improved, and the bearing capacity of the foundation of the wharf on the muddy coast is significantly increased. Thus, the amount of dredging and replacement work and the amount of backfill during wharf construction can be reduced, which is beneficial to environmental protection, and the construction cost can be reduced and the construction period can be shortened; 2) By driving a high-pressure jet grouting pile wall 20 connected to all the cement mixing pile walls 10 on the land side near the rear of the wharf and backfilling foam light soil 83 behind the high-pressure jet grouting pile wall 20, the form of the earth pressure action of the foundation soil behind the wharf is changed, and the stress mechanism of soil landslide in a local area behind the wharf is changed. Furthermore, the earth pressure behind the wharf is reduced, and the stability of the bank slope behind the wharf is significantly improved. Thus, the water depth condition of the high-piled wharf on the muddy coast can be improved, which is beneficial to increasing the overall draft depth of the muddy coast and can be applied to the construction of deep-water wharves; 3) By inserting I-beams 22 at intervals of piles in the cantilever section of the high-pressure jet grouting pile wall 20 to form a composite pile wall structure of high-pressure jet grouting piles 21 + I-beams 22, the strength and stability of the high-pressure jet grouting pile wall 20 are improved, and the stability of the bank slope behind the wharf is further improved; by arranging counterfort wave-blocking blocks 70 outside the high-pressure jet grouting piles 21, the ability of the high-pressure jet grouting pile wall 20 to resist the earth pressure behind the wharf is enhanced, the stability of the bank slope behind the wharf is further improved, and the anti-wave scouring ability of the high-pressure jet grouting pile wall 20 is enhanced.

[0050] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and the key points of each embodiment are the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or some technical features can be equivalently replaced without departing from the spirit of the technical solutions of the present invention, and they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A high-piled wharf structure on a muddy coast, characterized in that, Comprising: A plurality of cement mixing pile walls arranged in parallel, each of the cement mixing pile walls extending from the land side behind the wharf towards the sea side in front of the wharf; the cement mixing pile wall comprises a plurality of mutually occluding cement mixing piles, and the bottom of the cement mixing piles penetrates through the silt layer and enters the hard base; A high-pressure jet grouting pile wall, which is arranged near the land side behind the wharf and extends along the direction parallel to the wharf shoreline, and the high-pressure jet grouting pile wall is connected to all the cement mixing pile walls; the high-pressure jet grouting pile wall comprises a plurality of mutually occluding high-pressure jet grouting piles, and the top of the high-pressure jet grouting piles is above the water surface; foam lightweight soil is filled between the high-pressure jet grouting pile wall and the land behind the wharf; Multiple rows of wharf pile foundations are respectively arranged between two adjacent cement mixing pile walls. Each row of wharf pile foundations comprises a plurality of pipe piles, and the plurality of pipe piles are arranged at intervals from the high-pressure jet grouting pile wall towards the sea side in front of the wharf. The bottom of the pipe piles penetrates through the silt layer and enters the hard base, and the top of the pipe piles is above the water surface; A wharf deck structure, which is arranged on the top surfaces of all rows of wharf pile foundations; A stacking surface layer, which is arranged on the top surfaces of the land behind the wharf, the foam lightweight soil and the high-pressure jet grouting pile wall, and is smoothly connected to the wharf deck structure.

2. The high-piled wharf structure on muddy coast according to claim 1, characterized in that, A buttress type wave-blocking block is provided at the connection of each cement mixing pile wall and the high-pressure jet grouting pile wall; the buttress type wave-blocking block comprises a bottom plate and a side plate connected to form an L shape, and a plurality of rib plates obliquely supported between the bottom plate and the side plate. The bottom plate is connected to the top surface of the cement mixing pile wall, and the side plate abuts against the side wall of the high-pressure jet grouting pile wall facing the sea side in front of the wharf.

3. The high-pile wharf structure on muddy coast according to claim 2, wherein, In the height section where the high-pressure jet grouting pile wall is higher than the cement mixing pile wall, I-beams are inserted into the high-pressure jet grouting piles at every other pile.

4. The high-piled wharf structure on the muddy coast according to claim 2, wherein, A plurality of drainage boards are inserted into the silt layer between the high-pressure jet grouting pile wall and the land behind the wharf.

5. The high-piled wharf structure on muddy coast according to claim 2, characterized in that, The cement mixing piles are four-axis deep cement mixing piles; the high-pressure jet grouting piles are two-axis high-pressure jet grouting piles or four-axis high-pressure jet grouting piles; the pipe piles are steel pipe piles, concrete pipe piles or steel-concrete composite piles.

6. The construction method of the high-piled wharf structure on the muddy coast according to any one of claims 2-5, characterized in that, Including the following steps: S1. According to the design requirements, locally dredge the original mud surface of the silt layer; S2. Drive cement mixing piles along the direction perpendicular to the wharf shoreline to form cement mixing pile walls; complete the construction of all cement mixing pile walls in this way; S3. Backfill plain soil near the land side behind the wharf to form a temporary earth dam, which extends along the direction parallel to the wharf shoreline and has a length greater than the distance between the two outermost cement mixing pile walls. The top of the temporary earth dam is above the water surface; S4. Drive high-pressure jet grouting piles along the direction parallel to the wharf shoreline on the temporary earth dam to form a high-pressure jet grouting pile wall connected to all the cement mixing pile walls; in the height section where the high-pressure jet grouting pile wall is higher than the cement mixing pile wall, I-beams are inserted into the high-pressure jet grouting piles at every other pile; S5. Lay medium-coarse sand on the top surface of the silt layer between the high-pressure jet grouting pile wall and the land behind the wharf, then drive a plurality of drainage boards into the silt layer at this place, and drain the silt layer at this place by means of vacuum preloading or / and surcharge preloading; S6. Excavate the temporary earth dike located on the side of the high-pressure jet grouting pile wall facing the sea area in front of the wharf; S7. Between two adjacent cement mixing pile walls, drive a plurality of pipe piles at intervals from the high-pressure jet grouting pile wall towards the sea area in front of the wharf along the direction perpendicular to the wharf shoreline to form multiple rows of wharf pile foundations; S8. Install one of the counterfort wave-blocking blocks at the connection of each cement mixing pile wall and the high-pressure jet grouting pile wall; S9. Backfill foamed lightweight soil between the high-pressure jet grouting pile wall and the land area behind the wharf; S10. Construct the upper structure of the wharf on all rows of wharf pile foundations. The upper structure of the wharf includes pile caps, cross beams, tie beams, and wharf surface structures; construct the stacking surface layer on the land area behind the wharf, the foamed lightweight soil, and the top surface of the high-pressure jet grouting pile wall, and make the stacking surface layer connect smoothly with the wharf surface structure.

7. The construction method of the high-pile wharf structure on the muddy coast according to claim 6, characterized in that, A plurality of through holes are reserved on the bottom plate of the counterfort wave-blocking block; in step S8, drill a plurality of connection holes corresponding to the plurality of through holes on the cement mixing pile wall, insert steel pipes into the connection holes through the through holes, and then pour cement mortar into the through holes and the connection holes to install the counterfort wave-blocking block on the cement mixing pile wall; the depth of the connection holes is 2m to 4m.

8. The construction method of the high-piled wharf structure on the muddy coast according to claim 6, characterized in that, In step S2, the bottom of the cement mixing pile penetrates through the silt layer and enters the hard foundation by 2m to 3m.

9. The construction method of the high-piled wharf structure on the muddy coast according to claim 6, characterized in that, In step S4, at the corresponding wall section of the high-pressure jet grouting pile wall and the cement mixing pile wall, the bottom of the high-pressure jet grouting pile enters the cement mixing pile by 0.5m to 1m; at the wall section of the high-pressure jet grouting pile wall that does not correspond to the cement mixing pile wall, the bottom of the high-pressure jet grouting pile penetrates through the silt layer and enters the hard foundation by 2m to 3m.

10. The construction method of the high-piled wharf structure on the muddy coast according to claim 6, characterized in that, In step S7, the bottom of the pipe pile penetrates through the silt layer and enters the hard foundation at a preset depth.

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