Construction method of soft foundation embankment structure with embankment body space fused with municipal function

Abstract

The invention provides a construction method of a soft foundation embankment structure integrating a municipal function in an embankment body space, the construction method adopts the following soft foundation embankment structure, the soft foundation embankment structure comprises a pressing platform I, a seawall complex, a closed earthwork and a pressing platform II which are sequentially arranged from an open sea to an inland, the seawall complex comprises a pile foundation, a reinforced concrete raft plate arranged on the pile foundation and a reinforced concrete empty box dike body arranged on the reinforced concrete raft plate. A comprehensive pipe gallery space, a parking space, a patrol inspection and maintenance and driving channel and a driving entrance and exit for entering the patrol inspection and maintenance and driving channel are formed in the reinforced concrete empty box embankment body. The repression platforms in front of and behind the embankment body are implemented firstly, cement mixing piles and other composite foundation treatment methods are adopted for foundations below the platforms, the negative friction resistance effect, deformation and other adverse effects caused by soft soil foundations on pile foundations are greatly reduced, the mixing piles below the repression platforms on the inner side are densified to form frame supports, and the good shielding effect on later land area soil filling influences is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of seawall structures, and in particular to a construction method for a soft foundation embankment structure in which a embankment body space is integrated with municipal functions. Background Art

[0002] As the first line of defense against typhoon storm surge disasters, seawall projects are important infrastructure in coastal areas, where the economy is relatively developed and land resources are scarce. my country's muddy coasts are widely distributed, especially in the eastern Zhejiang coastal area, where the soft foundation is deep, and the land for seawall projects is limited and the technical requirements are high. Traditional soft foundation embankments are mostly large-section gentle slope earth-rock embankments, which occupy a huge area of ​​land, and due to the management and protection needs of water conservancy projects, the plane and three-dimensional space within the embankment cannot be used for other purposes. Since the beginning of the 21st century, concrete frame seawalls have been built along the coast of eastern Zhejiang, which has better solved the problem of large land area for earth-rock embankments on soft foundations. However, most of the built seawalls are open concrete frame types, or the empty boxes of the embankment are closed for management convenience, but the inner slope is equipped with air-tight earthworks, and the embankment space cannot be used.

[0003] When building a levee on a deep soft foundation on a coastal tidal flat, the lack of foundation bearing capacity has severely restricted the construction method. In addition, the new seawall has no old levee to protect it, so the construction site needs to build a cofferdam or wait for the tide to be built. The traditional solution is to use vacuum preloading and other methods to treat the foundation soil, and then fill it with earth and stone in layers to form a cofferdam. The construction period is long, and in order to ensure the overall stability, the cofferdam has a large cross-section and occupies a large area, which is extremely difficult to handle. In addition, the reinforced concrete frame levee built on soft foundation is usually supported by cast-in-place piles. The negative friction caused by the settlement of the foundation soil around the piles caused by the backfill behind the levee is large, which has an adverse effect on the stability of the frame levee. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a construction method for a soft foundation embankment structure in which the embankment body space is integrated with municipal functions, thereby solving the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a construction method of a soft foundation embankment structure in which the embankment body space integrates municipal functions, the construction method adopts the following soft foundation embankment structure, the soft foundation embankment structure includes a suppression platform 1, a seawall complex, airtight earthwork, and a suppression platform 2 arranged in sequence from the open sea to the inland, the seawall complex includes a pile foundation, a reinforced concrete raft slab arranged on the pile foundation, and a reinforced concrete empty box embankment body arranged on the reinforced concrete raft slab, the reinforced concrete empty box embankment body is formed with a comprehensive pipe gallery space, a parking space, an inspection and maintenance and driving channel, and a driving entrance and exit for entering the inspection and maintenance and driving channel, and a dry gate is arranged at the entrance of the driving entrance and exit;

[0008] The construction method includes the following steps:

[0009] S1. Treat the foundation and fill the platform at the location of suppression platform 1 and suppression platform 2 to form a construction road and water retaining cofferdam;

[0010] S2. Foundation treatment and cast-in-place pile implementation under the seawall complex;

[0011] S3, pouring of reinforced concrete empty box embankment;

[0012] S4, airtight earthwork filling behind the general section embankment, and dry gates at the node section;

[0013] S5. Laying of vegetation materials in front of the embankment, and planting of green plants in front of, on top of, and behind the embankment;

[0014] S6. The supporting rest station on the top of the dike and the empty boxes on the dike body are installed using auxiliary equipment.

[0015] Preferably, a supporting rest station is provided on the top of the reinforced concrete empty box embankment.

[0016] Preferably, the reinforced concrete empty box embankment is also provided with an equipment room, an elevator room, a stairwell and a ventilation shaft.

[0017] Preferably, the top of the suppression platform 1 is paved with vegetation-growing material.

[0018] Preferably, the tops of the suppression platform 1 and the suppression platform 2 are the construction road 1 and the construction road 2.

[0019] Preferably, an inclined wave-breaking block is provided on the side of the suppression platform facing the sea surface.

[0020] (III) Beneficial effects

[0021] The invention provides a construction method for a soft foundation embankment structure in which the embankment body space is integrated with municipal functions.

[0022] It has the following beneficial effects:

[0023] 1. The construction method of the soft foundation embankment structure that integrates municipal functions in the embankment space is that the front and rear suppression platforms of the embankment are implemented first, and the foundation under the platform adopts composite foundation treatment methods such as cement mixing piles, which greatly reduces the negative friction and deformation of the pile foundation caused by the soft soil foundation. The mixing piles under the inner suppression platform are encrypted to form a frame support, which has a good shielding effect on the influence of later land filling.

[0024] 2. The construction method of the soft foundation embankment structure that integrates municipal functions into the embankment space. The empty boxes of the seawall body are also used as parking lots, pipeline corridors, and inspection channels, which fully integrate municipal functions, intensively utilize underground space, and save precious coastal land resources; meet the requirements of seawall anti-seepage and airtightness, and are conducive to unified operation and management; empty boxes unload and pile foundations conduct loads, and the cross-section is greatly reduced, saving land and stone materials; the node sections form a seawall complex to meet the leisure and travel needs of coastal cities; the vegetation materials on the suppression platform in front of the embankment are both hydrophilic and ecological; the suppression platform also serves as a water retaining cofferdam and construction channel to avoid construction during the tide, greatly reducing the difficulty of construction and the risk of flooding, and reducing the cost of temporary projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of a node section seawall of the present invention;

[0026] Figure 2 A cross-sectional view of a general seawall section of the present invention;

[0027] Figure 3 It is the internal plan layout diagram of the seawall of the present invention.

[0028] In the figure: 1 pile foundation, 2 reinforced concrete raft slab, 3 reinforced concrete empty box embankment, 4 integrated pipeline corridor space, 5 node section parking space, 6 equipment room, 7 node section inspection and maintenance and driving passage, 8 dry gate, 9 driving entrance and exit, 10 supporting rest station, 11 vegetation material paving, 12 construction road one, 13 construction road two, 14 general section inspection and maintenance and driving passage, 15 general section parking space. DETAILED DESCRIPTION

[0029] The embodiment of the present invention provides a construction method of a soft foundation embankment structure in which the embankment body space integrates municipal functions, such as Figure 1-3As shown, the construction method adopts the following soft foundation embankment structure, which includes a suppression platform 1, a seawall complex, airtight earthwork, and a suppression platform 2, which are arranged in sequence from the open sea to the inland. The suppression platforms before and after the embankment are implemented first, and the foundation treatment under the platform forms a composite foundation. The tops of the suppression platforms 1 and 2 are construction roads 12 and 13, and the construction roads 12 and 13 also serve as water retaining cofferdams and construction channels. It reduces the investment in temporary projects and can reduce the adverse effects on the seawall pile foundation and the negative friction around the piles in the later stage. An inclined wave-breaking block is arranged on the side of the suppression platform 1 facing the sea surface. The top of the suppression platform 1 is paved with vegetation-type material pavement 11. The vegetation material covering the platform takes into account both hydrophilicity and ecology.

[0030] Specifically, the inner hollow box top plate of the seawall complex is sloped, and the covered earth is airtight. The seawall complex adopts a reinforced concrete hollow box structure supported by a cast-in-place pile raft foundation. The seawall complex includes a pile foundation 1, which serves as a foundation support. A reinforced concrete raft 2 is arranged on the pile foundation 1, and a reinforced concrete hollow box embankment body 3 is arranged on the reinforced concrete raft 2.

[0031] Node segments are set at certain intervals along the axis of the embankment, and the rest are general segments.

[0032] Node segment such as Figure 1 As shown, the empty box of the seawall at the node section is widened, and the top of the seawall is a supporting rest station 10, which can be used as a leisure square. The opening of the inner side wall of the seawall is used as a driving entrance and exit 9. There is no airtight earthwork at the entrance and exit, so a dry gate 8 is set. The seawall is connected along the line, and vehicles for inspection, maintenance and parking can pass through the seawall.

[0033] A comprehensive pipeline corridor space 4, a node section parking space 5, a node section inspection and maintenance and driving passage 7, and a driving entrance and exit 9 for entering the node section inspection and maintenance and driving passage 7 are formed in the reinforced concrete empty box embankment 3 of the node section, and a dry gate 8 is provided at the entrance of the driving entrance and exit 9.

[0034] The reinforced concrete empty box embankment 3 is also provided with an equipment room 6, an elevator room, a stairwell, and a ventilation shaft.

[0035] General segment such as Figure 2 As shown, the reinforced concrete hollow box embankment 3 of the general section is provided with a comprehensive pipe gallery space 4, a general section parking space 15, and a general section inspection and maintenance and vehicle passage 14, and no vehicle entrance or exit is provided in the general section. The backwater side of the reinforced concrete hollow box embankment 3 of the general section is covered with earthwork to seal the air.

[0036] The empty boxes on the seawall body are also used as parking lots, pipeline corridors, and inspection channels, fully integrating municipal functions, intensively utilizing underground space, and saving precious coastal land resources; meeting the seawall's anti-seepage and air-tightness requirements, while facilitating unified operation and management; the empty boxes unload and the pile foundations conduct the load, greatly reducing the cross-section, saving land and stone materials; the node sections form a seawall complex to meet the leisure and travel needs of coastal cities; the vegetation materials covering the suppression platform in front of the embankment are both hydrophilic and ecological; the suppression platform also serves as a water retaining cofferdam and construction channel to avoid construction during the tide, greatly reducing the construction difficulty and flood risk, and reducing temporary project costs.

[0037] The construction method includes the following steps:

[0038] S1. The foundation treatment at the location of suppression platform 1 and suppression platform 2 can be carried out by means of vacuum preloading, cement mixing piles, etc. to form a composite foundation. The foundation treatment of the suppression platform on the backwater side adopts a deepening and reinforcement treatment method to ensure effective shielding against the adverse effects of fill in the land behind the embankment.

[0039] S2. Ground treatment and bored pile implementation under the seawall complex: firstly, a composite foundation is formed as the basic working surface, and then bored piles are driven to form a pile foundation;

[0040] S3. Casting of reinforced concrete hollow box embankment body, the casting order is bottom plate, column, front and rear wall, top plate, drainage ditch is set on the bottom plate, reliable waterproof joint measures are adopted between hollow box structural units, concrete inside the hollow box is waterproofed, and the embankment body space is divided and arranged according to the specific integration purpose;

[0041] S4. The airtight earthwork is filled behind the general section embankment, and the dry gate is implemented at the node section. The dry gate also serves as the entrance and exit gate of the parking lot, and a herringbone gate can be used;

[0042] S5. Place artificial blocks for slope protection in front of the embankment, lay vegetation materials in front of the embankment, use reliable anchoring measures to increase the stability of the vegetation materials and the suppression platform in front of the embankment, and plant greening in front of the embankment, on the top of the embankment, and behind the embankment;

[0043] S6. Installation of supporting rest stations on the top of the dike and auxiliary equipment for utilizing empty boxes on the dike body.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for a soft foundation embankment structure in which the embankment space integrates municipal functions, characterized by: The construction method adopts the following soft foundation embankment structure, the soft foundation embankment structure comprises a suppression platform 1, a seawall complex, airtight earthwork, and a suppression platform 2 which are arranged in sequence from the open sea to the inland, the seawall complex comprises a pile foundation (1), a reinforced concrete raft (2) arranged on the pile foundation (1), and a reinforced concrete hollow box embankment body (3) arranged on the reinforced concrete raft (2), the reinforced concrete hollow box embankment body (3) is formed with a comprehensive pipe gallery space (4), a parking space, an inspection and maintenance and driving channel, and a driving entrance (9) for entering the inspection and maintenance and driving channel, and a dry gate (8) is arranged at the entrance of the driving entrance (9); The construction method includes the following steps: S1. Treat the foundation and fill the platform at the location of suppression platform 1 and suppression platform 2 to form a construction road and water retaining cofferdam; S2. Foundation treatment and cast-in-place pile implementation under the seawall complex; S3, pouring of reinforced concrete empty box embankment; S4, airtight earthwork filling behind the general section embankment, and dry gates at the node section; S5. Laying of vegetation materials in front of the embankment, and planting of green plants in front of, on top of, and behind the embankment; S6. The supporting rest station on the top of the dike and the empty boxes on the dike body are installed using auxiliary equipment.

2. The construction method of a soft foundation embankment structure with embankment body space integrated with municipal functions according to claim 1 is characterized by: A matching rest station (10) is arranged on the top of the reinforced concrete empty box embankment (3).

3. The construction method of a soft foundation embankment structure with embankment space integrating municipal functions according to claim 1 is characterized by: The reinforced concrete empty box embankment (3) is also provided with an equipment room, an elevator room, a stairwell and a ventilation shaft.

4. The construction method of a soft foundation embankment structure with embankment body space integrated with municipal functions according to claim 1 is characterized by: The top of the suppression platform 1 is paved with a vegetation material pavement (11).

5. The construction method of a soft foundation embankment structure with embankment body space integrated with municipal functions according to claim 1 is characterized by: The tops of the suppression platform 1 and the suppression platform 2 are construction road 1 (12) and construction road 2 (13).

6. The construction method of a soft foundation embankment structure with embankment space integrating municipal functions according to claim 1 is characterized by: The side of the suppression platform facing the sea surface is provided with an inclined wave-breaking block.

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