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CN-121992743-A - Permanent-facing combined slag soil treatment system based on existing wharf reconstruction and construction method thereof

CN121992743ACN 121992743 ACN121992743 ACN 121992743ACN-121992743-A

Abstract

The application relates to the field of port engineering transformation, in particular to a permanent combined slag soil treatment system based on existing wharf transformation and a construction method thereof, comprising a composite slag soil pit structure, a dual-function operation platform, an existing structure cooperation device and a modularized steel turning plate mud blocking system, wherein the composite slag soil pit structure adopts phi 600 bored piles to be connected with side wall embedded ribs, so as to realize permanent function conversion of guard piles, reduce the usage amount of concrete by 35%, the existing steel tie bars are anchored on the side walls of the slag soil pit after being cut off, the 90% bearing capacity is reserved, new and old structures are formed to cooperate with force, the modularized steel turning plate system dynamically adjusts loading and unloading angles through hinge design, and combines a shear key structure to ensure that the slag soil scattering rate is less than or equal to 2%, and the integrated permanent structure, hidden member reutilization and dynamic pollution prevention control are integrated, compared with the traditional scheme, the construction period is shortened by 40%, and efficient resource utilization and environment protection construction are realized.

Inventors

  • LI XIAOJUN
  • YU MEIXIN
  • LAI XIAOPENG

Assignees

  • 中船第九设计研究院工程有限公司

Dates

Publication Date
20260508
Application Date
20260122

Claims (8)

  1. 1. The permanent combined muck treatment system based on the existing wharf reconstruction is characterized by comprising a composite muck pit structure (1), a dual-function operation platform (2), an existing structure cooperative device (4) and a modularized steel turning plate mud blocking system (5); The composite muck pit structure (1) consists of a cast-in-situ reinforced concrete side wall (101), a bottom plate (102) connected with the side wall (101) and a retaining wall (103) formed by a plurality of phi 600 bored piles, wherein the bored piles used for the retaining wall (103) are rigidly connected with the side wall (101) through planting ribs, the elevation of the top of each bored pile is level with the top of the side wall (101), and the bored pile body bears the side wall load of a foundation pit support and a permanent muck pit in the construction period; The double-function working platform (2) consists of a cast-in-situ reinforced concrete large plate (201) and a bored pile foundation, wherein the bored pile foundation comprises an asymmetric pile foundation system formed by a front pile (202) and a rear pile (203), and the rear pile (203) is also used as a slag soil pit guard pile; The existing structure cooperative device (4) is characterized in that on the basis of keeping the current plate pile wharf steel pull rod (401), the cut steel pull rod (401) is anchored on the inner wall of the residue soil pit side wall (102) through a pre-buried shear member (402), so that a load transmission system of a new structure and an old structure is formed; the modularized steel turning plate mud blocking system (5) consists of a cast-in-place concrete rest pier (501) and a plurality of detachable steel turning plates (502), wherein the steel turning plates (502) are fixed on an embedded hot-dip galvanized steel plate of the rest pier (501) through bolts, so that a dynamically adjustable slag soil scattering prevention barrier is formed.
  2. 2. The permanent facing combined muck treatment system based on the existing wharf reconstruction, which is disclosed in claim 1, is characterized in that a bottom plate (102) of the composite muck pit structure (1) is directly located on a natural foundation, the thickness of the bottom plate (102) is 0.5m, the thickness of a side wall (101) is 0.4m, the spacing between cast-in-place piles used for a retaining wall (103) is 1.2m, the depth of a planted bar is more than or equal to 200mm, the diameter of a reinforced bar of cast-in-situ reinforced concrete of the side wall (101) is 20mm, and the tensile strength of the planted bar glue is more than or equal to 15MPa.
  3. 3. The permanent face combined slag soil treatment system based on the existing wharf reconstruction of claim 1, wherein pile diameters of the bored pile foundations are phi 600, pile spacing is 3.5m, pile tops are embedded into a cast-in-situ reinforced concrete large plate (201) for 0.8m, and an integral stress system is formed by welding pile top steel bars with steel bars in the cast-in-situ reinforced concrete large plate (201).
  4. 4. The permanent combined muck treatment system based on the existing wharf reconstruction of claim 1, wherein the existing structure cooperation device (4) is welded with steel bars of the muck pit side wall (101) through an embedded shear-resistant member (402), the end part of a steel pull rod (401) is connected with the embedded shear-resistant member (402) through a high-strength bolt, the exposed part of the steel pull rod (401) is preserved by adopting an epoxy resin coating, and the shear-resistant member (402) is a steel plate.
  5. 5. The permanent combined muck treatment system based on existing wharf reconstruction, which is characterized in that a plurality of steel turning plates (502) are connected in a hinged mode, the adjusting angle of each steel turning plate (502) is 0-90 degrees, a plurality of stiffening ribs are welded on the back face of each steel turning plate (502), the distance between adjacent stiffening ribs is 300mm, and shear keys are pre-buried at the tops of the piers (501).
  6. 6. A construction method based on the system according to any one of claims 1 to 5, characterized by comprising the steps of: S1, detecting and utilizing an existing pile foundation (6): carrying out low-strain detection and high-strain sampling inspection on 450 multiplied by 450 prefabricated square piles under the current fixed hanging pier, reserving qualified piles as operation platform bearing piles, and in-situ repairing and driving phi 600 drilling cast-in-place piles on unqualified piles; S2, construction of a permanent combined fender post: adopting GPS positioning paying-off to apply phi 600 bored cast-in-situ pile, wherein the pile length is 19-22.5m, the pile top is reserved with a reinforcement grafting interface, the exposed length is 500mm, and phi 400 high-pressure rotary spraying waterproof curtain (7) is applied between piles; S3, slag soil pit cooperative construction: The steel tie rods (401) are fixed by adopting temporary steel brackets before being cut off, and the steel tie rods (401) are anchored on the embedded steel plates after the side walls (101) are poured; S4, mounting a modularized steel turning plate (502): and C30 concrete rest piers (501) are poured at the front edge of the working platform, steel turning plates (502) are installed after the strength reaches 90%, and the bolt fastening torque value is controlled to be 120 N.m+/-5%.
  7. 7. The construction method according to claim 6, wherein the cut-off position of the steel pull rod (401) is 50mm away from the inner wall of the slag soil pit side wall (102), the cut-off section of the steel pull rod (401) is polished and leveled, then epoxy zinc-rich primer is coated, and the dry film thickness is more than or equal to 80 mu m.
  8. 8. The construction method according to claim 6, wherein the steel turning plate (502) is required to be subjected to an opening and closing test after being installed, so that the distance between the turning plate and the edge of the working platform in a 90-degree fully opened state is more than or equal to 200mm.

Description

Permanent-facing combined slag soil treatment system based on existing wharf reconstruction and construction method thereof Technical Field The invention relates to the field of port engineering reconstruction, in particular to a permanent combined slag soil treatment system based on existing wharf reconstruction and a construction method thereof, which are particularly suitable for environmental protection reconstruction of sheet pile wharf under soft soil geology and complex hydrogeology conditions. Background A large number of sheet pile wharfs are currently built at the end of the 20 th century in coastal areas of China, and important support is provided for port logistics development. However, due to the fact that early design standards are low, material performance is insufficient, and long-term bearing of ship impact and tidal load is achieved, structural damage such as corrosion of an anchor pulling system, forward tilting of a sheet pile wall, exceeding of a rear land area settlement and the like commonly occurs in an existing wharf. According to statistics, about 65% of sheet pile wharfs in service for more than 20 years can meet the operation requirements of modern ports through reinforcement or reconstruction, and the problems of long construction period, serious resource waste and the like exist in the traditional dismantling reconstruction scheme. The existing wharf reconstruction technology has the following outstanding problems: firstly, the slag soil treatment facility has poor cooperativity with the main structure of the wharf, and the temporary guard piles are separated from the permanent pile foundation system, so that the concrete consumption is increased by 30% -40%; Secondly, hidden structures such as a steel pull rod, a pile foundation and the like of the existing wharf are difficult to process, and the conventional cut-off and dismantling method is easy to cause the whole instability of the wharf; thirdly, about 5% -8% of materials are scattered into a water area in the process of loading and unloading the dregs, and the existing fixed baffle system is difficult to adapt to tide level change and ship berthing impact, so that serious environmental pollution is caused. Therefore, a dock modification technical system which can realize the fusion of a temporary enclosure structure and a permanent pile foundation system, cooperatively utilize an existing steel pull rod and has a dynamic pollution prevention function is needed, and the problems of resource waste, environmental risk and structural potential safety hazard existing in the traditional scheme are effectively solved. Disclosure of Invention The invention aims to provide a permanent combined slag soil treatment system based on existing wharf reconstruction and a construction method thereof, so as to solve the problems in the prior art. In a first aspect, the invention provides a permanent combined muck treatment system based on existing wharf reconstruction, which comprises a composite muck pit structure, a dual-function operation platform, an existing structure cooperation device and a modularized steel turning plate mud blocking system; The composite slag soil pit structure comprises a cast-in-situ reinforced concrete side wall, a bottom plate connected with the side wall and a retaining wall formed by a plurality of phi 600 bored piles, wherein the bored piles used for the retaining wall are rigidly connected with the side wall through planting ribs, the elevation of the top of each bored pile is level with the top of the side wall, and the bored pile body bears the load of a foundation pit support and a permanent slag soil pit side wall in the construction period; the double-function working platform consists of a cast-in-situ reinforced concrete large plate and a bored pile foundation, wherein the bored pile foundation comprises an asymmetric pile foundation system formed by a front pile and a rear pile, and the rear pile is also used as a slag soil pit guard pile; The existing structure cooperative device is characterized in that on the basis of keeping the current steel pull rod of the sheet pile wharf, the cut steel pull rod is anchored on the inner wall of the slag soil pit side wall through the pre-buried shearing-resistant member, so that a load transmission system of a new structure and an old structure is formed; the modularized steel turning plate mud blocking system consists of a cast-in-place concrete rest pier and a plurality of detachable steel turning plates, wherein the steel turning plates are fixed on an embedded hot-dip galvanized steel plate of the rest pier through bolts to form a slag soil scattering preventing barrier capable of being dynamically adjusted. In a preferred technical scheme, the bottom plate of the composite slag soil pit structure is directly located on a natural foundation, the thickness of the bottom plate is 0.5m, the thickness of a side wall is 0.4m, the spacing between cast-in-place