CN209482246U - An unloading sheet pile seawall structure - Google Patents

Abstract

The utility model is a kind of discharging type sheet pile sea wall structure, including ground, pile foundation, sheet pile wall, slip casting, sea wall platform, reinforced concrete pile cap, pile foundation are fixed on ground, and sheet pile wall is also secured on ground, and slip casting is filled between sheet pile wall and ground；The top cast-in-situ steel reinforced concrete cushion cap of pile foundation, pile foundation and sheet pile wall are linked together, and sea wall platform is located at the land side of sheet pile wall as land construction platform.The utility model reduces over-water construction workload, improves construction efficiency；Sheet pile wall is located in the middle part of cushion cap, and taper pile is arranged in the marine side of sheet pile wall, and taper pile can share horizontal force, and cushion cap is very wide and bottom elevation is lower, plays the role of off-load soil pressure；Pile foundation is designed using multiline pile, and whole structural stability can be improved, and reduces horizontal displacement.

Description

An unloading sheet pile seawall structure

technical field

The utility model relates to an unloading type sheet pile seawall structure in a complex environment in port engineering, in particular to an unloading type sheet pile seawall structure with a wide-band bearing platform, which belongs to the innovative technology of the unloading type sheet pile seawall structure.

Background technique

The seawall is an embankment project built to defend against the hazards of storm tides and waves to the protected area, and it is also an important hydraulic structure for sea reclamation projects. According to the structural type, seawalls are divided into three types: slope type, steep wall type and mixed type, all of which are traditional earth-stone structure seawalls. For a long time, the traditional earth-rock structure has been basically used in seawall construction. However, with the development of coastal economy and society, people's requirements for the ecological environment, or special environmental conditions, the traditional earth-rock structure has also been exposed during construction and operation. More and more disadvantages are mainly reflected in the following aspects: (1) The amount of soil and stone is huge. (2) The degree of construction mechanization is low and the construction period is long. (3) Great impact on coastal ecological environment. (4) The settlement after construction is large, which affects the normal function of the seawall. (5) The volume of earth and stone is large, and the foundation soil is squeezed, which has a great impact on the displacement of surrounding buildings. The utility model can solve various shortcomings of the traditional seawall, and provides a new direction for the new seawall structure.

The utility model is a wide bearing platform unloading sheet pile seawall with multiple rows of piles, and it is also a new anchorless sheet pile seawall. The pile foundation of this structure adopts prestressed concrete sheet piles and PHC piles, and the upper part adopts high-strength piles. The concrete wide cap (equivalent to the unloading plate of the gravity structure) can effectively improve the active earth pressure on the structure.

Contents of the invention

The purpose of the utility model is to provide an unloading type sheet pile seawall structure. The utility model is especially suitable for unfavorable conditions such as small piling equipment, narrow construction work surface, minimal impact on adjacent projects, poor geological conditions and incapable of replacement, large ground load and high anti-corrosion requirements. The utility model can meet the requirements of reasonable economy, safety and reliability, and is worth popularizing in the port industry.

The technical scheme of the utility model is as follows: The unloading type sheet pile seawall structure of the utility model includes foundation, pile foundation, sheet pile wall, grouting, seawall platform, reinforced concrete cap, wherein the pile foundation is fixed on the foundation , the sheet pile wall is also fixed on the foundation, and the grouting is filled between the sheet pile wall and the foundation; the reinforced concrete cap is cast on the top of the pile foundation and the sheet pile wall, and the pile foundation and the sheet pile wall are connected as a whole. The embankment platform is set on the land side of the sheet pile wall as the land construction platform.

The utility model is a pile foundation vertical structure, and cement mixing piles are used to reinforce the soft soil layer of the foundation, which can minimize the safety impact on adjacent projects. All types of piles can be constructed by small piling barges to meet the restriction requirements of navigable holes. Prestressed U-shaped concrete sheet piles are used for the retaining part, which is more corrosion-resistant than conventional steel sheet piles, and can meet the engineering requirements with a longer design period. After the half-pile PHC piles, sheet piles and caps of the first stage are constructed, a three-pile retaining cap structure is formed, and then the medium-coarse sand platform is backfilled on the land side of the sheet piles to provide land for the remaining PHC piles and the caps of the second stage. The upper construction work surface reduces the workload of water construction and improves construction efficiency. The sheet pile is located in the middle of the cap, and there is an inclined pile in front to share the horizontal force. The cap is very wide and the bottom elevation is low, which plays a role in unloading the earth pressure. The multi-row pile design can improve the overall stability of the structure and reduce horizontal displacement.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a seawall structure of a wide-band cap unloading type sheet pile of the present invention.

Fig. 2 is a schematic diagram of the pile position layout of the seawall structure of the unloading type sheet pile with wide band cap of the present invention.

Fig. 3 is a large sample diagram of the pretensioned prestressed U-shaped concrete sheet pile of the seawall structure of the unloading type sheet pile with wide cap of the utility model.

Detailed ways

The utility model will be described in further detail below in conjunction with embodiment and accompanying drawing:

Fig. 1 is a cross-sectional schematic view of the unloading type sheet pile seawall structure of the present invention, including foundation 1, pile foundation 2, sheet pile wall 3, grouting 4, seawall platform 5, reinforced concrete cap 6, wherein the pile foundation 2 is fixed on the foundation 1, and the sheet pile wall 3 is also fixed on the foundation 1, and the grouting 4 is filled between the sheet pile wall 3 and the foundation 1; the reinforced concrete cap is cast in place on the top of the pile foundation 2 and the sheet pile wall 3 6. The pile foundation 2 and the sheet pile wall 3 are integrated, and the seawall platform 5 is set on the land side of the sheet pile wall 3 as an onshore construction platform.

In the present embodiment, the mud surface on the sea side of the above-mentioned sheet pile wall 3 is provided with a bottom protection structure, and the bottom protection structure is to lay a composite geotechnical mat 11 on the mud surface, and fill two stone cushions 12 on the composite geotechnical mat 11. Throw the block stone bottom protection 13 on two stone pads 12 .

In this embodiment, the block stone foundation 7 is backfilled on the above-mentioned cast-in-place reinforced concrete cap 6, and the mixed crushed stone filter layer 8 is backfilled on the side of the joint between the cast-in-place reinforced concrete cap 6 and the block stone foundation 7, The top of the base 7 is a cast-in-place concrete pavement 9, and a grass slope 10 is planted on the block stone base 7 on the same side as the mixed crushed stone filter layer 8. In this embodiment, the mixed crushed stone filter layer 8 is backfilled on the land side of the joint between the cast-in-place reinforced concrete cap 6 and the block stone foundation 7 . In this embodiment, the rock foundation 7 is backfilled with 1 to 100 kg of rock on the upper part of the cap to the bottom of the concrete pavement 9; the thickness of the mixed gravel filter layer 8 is not less than 600 mm.

In this embodiment, the above-mentioned foundation 1 uses cement mixing piles to strengthen the soft soil layer. The cement mixing piles are arranged in a grid pattern and are designed with multiple rows of piles. The construction of the mixing boat is used on the water. The design of multiple rows of piles can improve the overall stability of the structure. resistance, reducing horizontal displacement.

In this embodiment, the above-mentioned seawall platform 5 is formed by throwing and filling sand on the land side of the sheet pile wall 3 to form a construction platform. 0.35mm or more.

In this embodiment, the above-mentioned reinforced concrete platform 6 is a wide reinforced concrete platform. The reinforced concrete cap width of general harbor industry industry is within 10 meters, and the width of this reinforced concrete cap 6 reaches 17.5m, is a kind of wide cap. The reinforced concrete cap 6 is poured in two stages. The cap is very wide and the bottom elevation is low, which plays the role of unloading earth pressure.

In this embodiment, the above-mentioned pile foundation 2 adopts PHC piles. One PHC inclined pile (4:1) and one PHC straight pile are arranged on the offshore side of the above-mentioned sheet pile wall 3 . The inclined pile can share the horizontal force.

In this embodiment, four PHC straight piles are arranged on the land side of the sheet pile wall 3 . The sheet pile wall 3 adopts the pre-tensioned prestressed U-shaped concrete sheet pile, and the sheet pile wall 3 is arranged in the middle of the cap; the L-shaped C40 reinforced concrete cap 6 is cast in place on the top of the pile foundation 2 and the sheet pile wall 3, and the The pile foundation 2 is integrated with the sheet pile wall 3, and the cap is poured in two stages. The above-mentioned sheet pile wall 3 adopts pre-tensioned prestressed U-shaped concrete sheet piles, which are more corrosion-resistant than conventional steel sheet piles. The sheet piles are arranged in the middle of the cap. Between the wall 3 and the cement mixing pile, the rotary grouting pile is re-drilled to achieve the effect of filling the grouting 4.

The above-mentioned reinforced concrete cap 6 connects the pile foundation 2 as a whole, and the cap is poured in two stages. After the PHC piles on the sea side of sheet pile wall 3, sheet pile wall 3 and the reinforced concrete cap 6 of the first stage are constructed above water, three pile caps are formed, and medium-coarse sand is backfilled behind the sheet piles to above the water surface to form a seawall platform 5. Carry out the land construction of the remaining PHC piles and the reinforced concrete cap 6 of the second stage.

In this embodiment, the above foundation 1 has a pile diameter of 700 mm, an overlap of 200 mm, and a reinforcement depth of 10 m. It is arranged in a grid shape, and the piles are driven between the grid shapes. The layout is shown in Figure 2.

In this embodiment, the above-mentioned sheet pile wall 3 is arranged in the middle of the reinforced concrete cap 6, and YUBZ-800 prestressed U-shaped concrete sheet piles are used, and a PHC pipe pile with a diameter of 800mm is arranged in front of the concrete sheet piles (slope 4: 1) and one straight PHC pipe pile with a diameter of 800mm, and four straight PHC pipe piles with a diameter of 600mm are arranged behind the concrete sheet pile, and the distance between the PHC pipe piles is 3m. Due to the impact of driving, the PHC pipe piles are arranged in a square shape (the cement mixing piles are arranged in a grid shape). The pile foundation takes the fully weathered mixed granite layer as the bearing layer, and the penetration into the bearing layer is not less than 1.5 times the pile diameter. In order to further reduce the structural displacement, after sinking the U-shaped concrete sheet pile, the rotary grouting pile is re-drilled between the sheet pile and the cement mixing pile to achieve the effect of grouting filling (4).

Figure 3 is a large sample diagram of the YUBZ-800 prestressed U-shaped concrete sheet pile. The specific parameters of the section characteristics of the YUBZ-800 prestressed U-shaped concrete sheet pile are: 800mm (section height) × 160mm (slab thickness) × 1200mm (slab width) , the cross-sectional area is 342480mm ² , the effective precompression stress is 5.06Mpa, the cracking moment is 437KN.m, the bending moment is 700 KN.m, the shearing force is 566KN, the design value of vertical bearing capacity is 5380KN, and the vertical tensile bearing capacity is The design value is 2010KN, and the theoretical weight is 874Kg/m.

In this embodiment, the above-mentioned reinforced concrete platform 6 is also used as a wave retaining wall. After the half-pile PHC piles, sheet piles and the caps of the first stage are constructed, a three-pile retaining cap structure is formed, and then the seawall platform 5 is formed by backfilling medium and coarse sand on the land side of the sheet piles, which is the remaining PHC piles and the second stage. The bearing platform provides a land construction work surface, reducing the amount of water construction work.

In this embodiment, the composite geotechnical mat 11 can make the block stone bottom protection 13 evenly laid, and reduce differential settlement. The specific parameters of the performance index of the composite geotechnical mat are ≥ 150 kN/m in the meridian direction and ≥ 50 kN in the weft direction. /m, warp/weft elongation at break ≤ 12%, made of high-strength polyester. 10~100kg of rocks are thrown and filled by civilian boats for the bottom protection of riprap.

The pile foundation of the utility model adopts prestressed concrete pipe piles (concrete is C80) and prestressed concrete sheet piles (concrete is C60). The durability is better than steel pipe piles and steel sheet piles, and no special anti-corrosion is required (only sea industrial coating treatment), the cost is relatively low, the construction experience is mature and reliable, and the requirements for construction equipment are relatively low. In addition, after the PHC pipe pile with a diameter of 800mm on the sea side of the utility model and the prestressed U-shaped concrete sheet pile are sinking in water and the bottom plate of the front upper part of the platform is poured, consider backfilling the sand above the water surface to form a land construction platform, and then carry out The onshore construction of PHC pipe piles with a diameter of 600mm greatly speeds up the construction speed and effectively saves engineering investment; the third is that the upper part adopts unloading caps, which not only play a role in unloading, but also reduce active earth pressure, and can make the land area behind the seawall energy-saving. Withstand heavy loads.

The utility model relates to a seawall structure of unloading sheet piles with wide-band caps in complex environments in port engineering, and is a new type of anchorless sheet pile structure, which can well solve the situation that anchorage facilities cannot be installed on seawalls. Its technical level is advanced on the basis of the unloading sheet pile wharf structure, and the wide cap unloading sheet pile structure adopted can be widely used in seawall projects for sea reclamation and land reclamation.

Although the embodiments of the present utility model have been described above in conjunction with the accompanying drawings, the present utility model is not limited to the above-mentioned specific embodiments and application fields, and the above-mentioned specific embodiments are only illustrative, instructive, and not limiting sexual. Under the enlightenment of this specification and without departing from the protection scope of the claims of the present invention, those skilled in the art can make various forms, which all belong to the protection of the present invention.

Claims (9)

1. An unloading type sheet pile seawall structure is characterized in that comprising foundation, pile foundation, sheet pile wall, grouting, seawall platform, reinforced concrete cap, wherein pile foundation is fixed on the foundation, and sheet pile wall also It is fixed on the foundation, and grouting is filled between the sheet pile wall and the foundation; the reinforced concrete cap is cast on the top of the pile foundation and the sheet pile wall, and the pile foundation and the sheet pile wall are connected as a whole, and the seawall platform is set on the slab The onshore side of the pile wall serves as an onshore construction platform. 2. The unloading type sheet pile seawall structure according to claim 1, characterized in that the sea side mud surface of the above-mentioned sheet pile wall is provided with a bottom protection structure, and the bottom protection structure is to lay a composite geotechnical mat earlier on the mud surface, Throw and fill two stone cushions on the composite geotechnical pad, and throw stone blocks on the two stone cushions to protect the bottom. 3. The unloading type sheet pile seawall structure according to claim 1, characterized in that the block stone foundation is backfilled on the above-mentioned cast-in-place reinforced concrete cap, on the side of the joint between the cast-in-place reinforced concrete cap and the block stone foundation Backfill the mixed gravel filter layer, cast concrete pavement on the top of the block stone foundation, and plant grass slopes on the same side of the block stone foundation as the mixed gravel filter layer. 4. The unloading type sheet pile seawall structure according to claim 1, characterized in that the above-mentioned foundation uses cement mixing piles to reinforce the soft soil layer, and the cement mixing piles are arranged in a grid shape. 5. The unloading type sheet pile seawall structure according to claim 1, characterized in that the seawall platform is formed by throwing and filling sand on the land side of the sheet pile wall to form a construction platform. 6. The unloading type sheet pile seawall structure according to claim 1, characterized in that the reinforced concrete cap is a reinforced concrete wide cap. 7. The unloading type sheet pile seawall structure according to claim 1, characterized in that the above-mentioned pile foundation adopts PHC piles. 8. The unloading sheet pile seawall structure according to any one of claims 1 to 7, characterized in that one PHC inclined pile (4:1) and one PHC straight pile are arranged on the sea side of the above-mentioned sheet pile wall. pile. 9. The unloading type sheet pile seawall structure according to claim 8, characterized in that four PHC straight piles are arranged on the land side of the sheet pile wall.