Strengthening construction method for hydraulic reclamation desilting reclamation foundation
By setting up drainage plates and drainage pipes in the reclamation foundation, a drainage channel is formed, and combined with column hammering and pile expansion technology, the problem of insufficient reinforcement of deeper soil is solved, and more efficient foundation reinforcement and construction simplicity is achieved.
Patent Information
- Application Number
- CN202510029681.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-04-04
AI Technical Summary
The traditional drainage consolidation method has relatively weak reinforcement of deeper soils, and the loading process is slow, the construction period is long, and the operation is cumbersome, making it difficult to effectively deal with the reclaimed foundation formed by blowing and silting.
A sand cushion layer is laid on the surface of the reclaimed foundation, and multiple rows of vertical drainage plates and horizontal drainage pipes are laid in the middle of the foundation to form a drainage channel to promote the discharge of pore water in the foundation soil. At the same time, through column hammering pile expansion technology, filler is filled in layer by layer in the pile hole and compacted to form reinforced piles.
Through drainage consolidation and column hammering pile expansion technology, the bearing capacity and stability of the reclamation foundation are significantly improved, the construction process is simplified, the project cost is reduced, and the post-maintenance and reinforcement costs are reduced.
Smart Images
Figure CN119754258A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of building construction, and in particular to a method for reinforcing a foundation by blowing, filling, desilting and reclamation. Background Art
[0002] The reclamation foundation formed by filling and dredging technology is usually replaced with dredged soil. Dredged soil is in an underwater environment and will carry a large amount of seawater or lake water during the excavation and filling process. Therefore, the reclamation foundation formed by filling and dredging and replacing dredged soil often has the characteristics of high water content, large porosity, loose particle accumulation, high compressibility, obvious settlement and uneven settlement. The traditional drainage consolidation method relies on loading and vacuum preloading to discharge the pore water in the foundation soil and gradually consolidate the soil. However, the reinforcement degree of deeper soil is relatively weak, and the loading process is relatively slow, the construction period is long, and the transportation and stacking of the loading materials are relatively cumbersome. There are certain limitations in dealing with the reclamation foundation formed by filling and dredging.
[0003] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention
[0004] In order to overcome the defects of the prior art, a method for reinforcing a reclamation foundation formed by dredging and filling is provided to solve the problem that the reinforcement degree of the reclamation foundation formed by dredging and filling is relatively weak for deeper soil bodies using the traditional drainage consolidation method.
[0005] In order to achieve the above object, a method for reinforcing a foundation by dredging and filling is provided, comprising the following steps:
[0006] Laying a sand cushion layer on the surface of the reclaimed foundation to be treated;
[0007] Multiple rows of drainage boards are installed at intervals in the reclamation foundation, so that the drainage boards penetrate the silt layer below the foundation, and the upper ends of the drainage boards extend to the outside of the sand cushion layer;
[0008] Laying a drainage pipe on the sand cushion layer, and connecting the drainage pipe to a row of drainage boards;
[0009] Pile holes are formed by impacting between two adjacent rows of drainage boards;
[0010] Filling materials are layered into the pile holes and compacted to form reinforced piles.
[0011] Furthermore, the step of installing multiple rows of drainage boards at intervals in the reclamation foundation includes:
[0012] Inserting the drainage board into the casing;
[0013] pressing the casing into the silt layer;
[0014] The upper body of the casing is pulled out, so that the drainage board is left in the reclamation foundation.
[0015] Furthermore, when implementing the step of filling the pile hole with fillers in layers and compacting to form reinforced piles, the fillers are filled into the pile hole in layers, the number of hammer strikes for each filler is higher than 3, and the penetration of the last hammer strike at a height of 6m is less than 0.15m.
[0016] Furthermore, the thickness of the sand cushion layer is 30 to 50 cm.
[0017] The beneficial effect of the present invention is that the construction method for strengthening the foundation of reclamation by filling and dredging of the present invention is to drain and consolidate the reclamation foundation formed by filling and dredging and replacing dredged soil, by arranging vertical drainage boards and horizontal drainage pipes in the foundation to form drainage channels, so as to promote the discharge of pore water in the foundation soil, and the soil after drainage and consolidation can better bear the load. During the construction process of the column hammer expansion pile, the pile material is rammed into the foundation through the impact of the column hammer, further enhancing the bearing capacity of the foundation.
[0018] The construction method of the foundation reinforcement by filling, dredging and reclamation of the present invention is simple and quick to construct, does not require a large amount of mechanical equipment and manpower investment, reduces engineering costs, effectively improves the bearing capacity and stability of the foundation, reduces subsequent maintenance and reinforcement costs, and saves engineering costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:
[0020] Figure 1 It is a cross-sectional view of a dredging and filling foundation for sea reclamation according to an embodiment of the present invention.
[0021] Figure 2 It is a schematic plan view of a dredging and filling sea reclamation foundation according to an embodiment of the present invention. DETAILED DESCRIPTION
[0022] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.
[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0024] Reference Figure 1 and Figure 2 As shown, the present invention provides a method for reinforcing a foundation by dredging and filling, comprising the following steps:
[0025] S1. Laying a sand cushion layer 1 on the surface of the reclaimed foundation to be treated.
[0026] In this embodiment, the reclaimed foundation to be processed is a dredging and filling reclaimed foundation, which includes a silt sand layer, a silty clay layer, a silt layer, and a plain fill layer from bottom to top.
[0027] As a preferred implementation, the thickness of the sand cushion layer is 30 to 50 cm.
[0028] Before laying the sand cushion layer, geological survey is carried out first, and the detection holes are arranged in a 15×15m grid. After the survey is completed, the results are recorded and a columnar diagram of the detection holes is drawn, indicating the thickness of the cover layer and the thickness of the silt in each area.
[0029] Then use bulldozers, graders and other equipment to level the construction site. The slope of the leveled site should meet the drainage requirements. Generally, the drainage slope of the site is required to be no less than 0.3% to 0.5% to ensure that the accumulated water in the site can be drained smoothly during the construction period; prepare the drainage system and materials used for column hammer punching pile construction, and debug and maintain the drainage board and column hammer punching pile construction equipment.
[0030] When laying the sand cushion layer, lay a sand cushion layer on the foundation surface with a thickness of 30 to 50 cm and level it manually.
[0031] S2. Multiple rows of drainage boards 2 are installed at intervals in the middle of the reclamation foundation, so that the drainage boards penetrate the silt layer below the foundation, and the upper ends of the drainage boards extend to the outside of the sand cushion layer.
[0032] Specifically, the step S2 of laying multiple rows of drainage boards at intervals in the reclamation foundation includes:
[0033] S21. Insert the drain board into the casing.
[0034] S22. Press the casing into the silt layer.
[0035] S23. Pull out the upper body of the casing, leaving the drainage board in the reclamation foundation.
[0036] Install the vertical drain board, insert the drain board into the casing, start the vibrating hammer, press the casing and drain board into the soil, and the drain board needs to penetrate the silt layer, and the depth must not be less than the designed depth. The conveying roller is reversed, the drain board is loosened, the casing is lifted, and the drain board should remain in the soil to meet the designed depth. Cut off the drain board 20cm above the ground and move to the next hole for construction.
[0037] S3. Lay drainage pipes on the sand cushion layer and connect the drainage pipes to a row of drainage boards.
[0038] Connect the horizontal drain pipe to the drain board. The vertical drain board and the horizontal drain pipe are connected to each other to form a drainage system. When connecting the drain board and the horizontal drain pipe, pay attention to ensure the firmness and sealing of the connection to avoid water leakage and other problems.
[0039] S4. Pile holes are formed by impact between two adjacent rows of drainage boards.
[0040] First, measurement and layout are carried out. The technical personnel use a total station to accurately lay out the boundaries of the pile treatment range according to the design drawings, use a steel ruler to locate the middle pile position, and insert wooden stakes, bamboo stakes, or white lime dots to mark it.
[0041] The machinery is then put into place to ensure that it will not tilt or move during construction.
[0042] Then impact to form a hole. Specifically, the column hammer is raised to a certain height, and it automatically unhooks and falls to impact the soil layer, and impacts repeatedly to the designed hole depth. If the hole collapses or shrinks seriously during the hole forming process and the hole cannot be formed, casing construction can be used, but the casing wall should be equipped with an observation port (spacing 2.0m) and a feed port (observation port) at the top. When the soil on site is soft and causes excessive suction of the column hammer, measures should be taken to eliminate it, and the hammer should not be lifted forcibly to prevent the lifting equipment from overturning due to overload. When the hole is formed to the vicinity of the designed hole bottom elevation, and the single-shot penetration is greater than 1.0m, the bottom of the hole can be backfilled with bricks or gravel and compacted repeatedly, and then the soil can be filled and tamped.
[0043] S5. Fill the pile hole with fillers in layers and compact it to form a reinforced pile 3.
[0044] Specifically, in step S5, when the step of filling the pile hole with fillers in layers and compacting to form a reinforced pile is implemented, the fillers are filled in the pile hole in layers, the number of hammer strikes of the fillers each time is higher than 3, and the penetration of the last hammer strike at a height of 6 m is less than 0.15 m.
[0045] During the filling compaction process, the pile body filling material is natural soil obtained locally. It should be sieved before use. The filling material is filled into the pile hole in layers and compacted. The number of hammer blows for each filling material is not less than 3. The penetration of the last hammer with a height of 6m should be less than 0.15m, otherwise, the tamping should be continued until the requirements are met. When the pile is formed to the ground, it can be repeatedly tamped with a low-drop hammer and multiple blows, so that the ground rise does not exceed 0.15m.
[0046] After the pile quality inspection, the reinforced foundation is leveled and rolled. A bulldozer is used to remove debris and obstacles on the surface of the site, and the site is initially leveled. A roller is used to compact the site. The rolling operation follows the principle of from the edge to the center and from low to high to ensure that the site is compacted evenly and densely.
[0047] Monitoring points are set up on the reinforced foundation and in the foundation treatment area, including settlement observation points, pore water pressure observation points, horizontal displacement observation points, etc., to ensure that the deformation and consolidation of the foundation can be accurately monitored.
[0048] To inspect the quality of the foundation after reinforcement, a static load test method is used to inspect the bearing capacity of the foundation in the reinforced area after the reinforcement is completed.
[0049] The method for reinforcing the foundation of a reclamation soil formed by replacing dredged soil with dredged soil by filling and desilting is provided with a vertical drainage board and a horizontal drainage pipe in the foundation to form a drainage channel, so that the pore water in the foundation soil can be discharged, and the soil body after drainage and consolidation can better bear the load. During the construction process of the column hammer expansion pile, the pile body material is rammed into the foundation through the impact of the column hammer, further enhancing the bearing capacity of the foundation.
[0050] The construction method of the foundation reinforcement by filling, dredging and reclamation of the present invention is simple and quick to construct, does not require a large amount of mechanical equipment and manpower investment, reduces engineering costs, effectively improves the bearing capacity and stability of the foundation, reduces subsequent maintenance and reinforcement costs, and saves engineering costs.
[0051] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.
Claims
1. A method for reinforcing a foundation by dredging and filling, characterized in that: The following steps are involved: Laying a sand cushion layer on the surface of the reclaimed foundation to be treated; Multiple rows of drainage boards are installed at intervals in the reclamation foundation, so that the drainage boards penetrate the silt layer below the foundation, and the upper ends of the drainage boards extend to the outside of the sand cushion layer; Laying a drainage pipe on the sand cushion layer, and connecting the drainage pipe to a row of drainage boards; Punching and forming pile holes between two adjacent rows of drainage boards; Filling materials are filled into the pile holes in layers and compacted to form reinforced piles.
2. The method for reinforcing the foundation of land reclamation by dredging and filling according to claim 1 is characterized in that: The step of laying multiple rows of drainage boards at intervals in the reclamation foundation comprises: Inserting the drainage board into the casing; pressing the casing into the silt layer; The upper body of the casing is pulled out, so that the drainage board is left in the reclamation foundation.
3. The method for reinforcing the foundation of land reclamation by dredging and filling according to claim 1 is characterized in that: When implementing the step of filling the pile hole with fillers in layers and compacting to form reinforced piles, the fillers are filled into the pile hole in layers, the number of hammer strikes for each filler is higher than 3, and the penetration of the last hammer strike at a height of 6m is less than 0.15m.
4. The method for reinforcing the foundation of land reclamation by dredging and filling according to claim 1 is characterized in that: The thickness of the sand cushion layer is 30 to 50 cm.