CN219240167U

CN219240167U - Coastal silt area foundation replacement structure

Info

Publication number: CN219240167U
Application number: CN202222448412.4U
Authority: CN
Inventors: 路瑞强; 陈圣甜; 王玉山; 吴丰; 陈飞飞; 梁超; 宫德帝; 和雨竹; 陈帅; 陈鹏宇
Original assignee: Beijing Municipal No3 Construction Project Co ltd; Beijing Municipal Construction Co Ltd
Current assignee: Beijing Municipal No3 Construction Project Co ltd; Beijing Municipal Construction Co Ltd
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2023-06-23
Anticipated expiration: 2032-09-15

Abstract

The application discloses a foundation reclamation structure of a coastal silt area, which comprises a gravel cushion layer below the ground, a embankment structure above the ground and a drawknot net structure between the gravel cushion layer and the embankment structure, wherein the drawknot net structure part extends into the gravel cushion layer; the drawknot net structure comprises a drawknot net layer which is tiled on the broken stone cushion layer, connecting ropes which are bound on the drawknot net layer and extend into the broken stone cushion layer, and drawknot ropes which are arranged at intervals along the distribution direction of the connecting ropes, and the drawknot ropes are horizontally paved in the broken stone cushion layer. The coastal silt area foundation filling structure of this application will draw knot net structure to extend and distribute in the rubble bed course, combine together with the rubble bed course, can effectively improve the filling strength of changing of rubble bed course, reduce the settlement volume of weak soil roadbed, guarantee the bearing capacity of roadbed.

Description

Coastal silt area foundation replacement structure

Technical Field

The application relates to the technical field of coastal soft soil foundation treatment, in particular to a coastal silt area foundation filling structure.

Background

Along with the rapid development of coastal region economy in China, the demand for infrastructure construction is continuously increased, large-scale highway, railway and industrial factory building construction is carried out in coastal region, and most of the buildings are built on coastal soft soil foundations.

The coastal soft soil foundation is mainly formed by marine deposition, the stratum comprises a thicker fine sand layer or silt layer, and a certain thickness of silt is distributed on the upper part of the sand layer; the fine sand layer or silt layer makes the foundation have higher earthquake liquefaction possibility, and the silt soil layer has higher water content and higher liquid limit, so that the compressibility of the silt soil layer is higher, and the drainage consolidation speed is slow.

Aiming at the situation, how to ensure the bearing capacity of the soft soil foundation in the coastal silt area is a problem to be solved.

Disclosure of Invention

In order to improve the bearing capacity of the foundation, the application provides a foundation filling structure in a coastal silt area.

The application provides a coastal silt area foundation reclamation structure, adopts following technical scheme:

the foundation reclamation structure for the coastal silt area comprises a broken stone bedding layer below the ground, a embankment structure above the ground and a drawknot net structure between the broken stone bedding layer and the embankment structure, wherein the drawknot net structure partially extends into the broken stone bedding layer.

By adopting the technical scheme, the foundation replacement structure of the coastal silt area is characterized in that the pull-up net structures are distributed in the broken stone cushion layer in an extending mode, then the pull-up net structures and the broken stone cushion layer are compacted together, the replacement strength of the broken stone cushion layer can be effectively improved, the subsidence of the soft soil roadbed is reduced, and the bearing capacity of the roadbed is guaranteed.

Optionally, the drawknot net structure comprises a drawknot net layer paved on the gravel cushion layer, connecting ropes bound on the drawknot net layer and extending into the gravel cushion layer, and drawknot ropes distributed at intervals along the distribution direction of the connecting ropes, wherein the drawknot ropes are horizontally paved in the gravel cushion layer.

By adopting the technical scheme, the broken stone cushion layer is integrally tied from inside to outside through the tying ropes by the tying net structure, so that the stability of the coastal foundation filling structure is enhanced.

Optionally, the drawstring is distributed in a radial line shape.

By adopting the technical scheme, the combination range of the drawknot ropes distributed in a radial way and the crushed stone cushion layer is wider, so that the stability of the crushed stone cushion layer is better.

Optionally, the knotting net layer, the connecting rope and the knotting rope are all marine ropes.

By adopting the technical scheme, the marine rope has good wear resistance and corrosion resistance, and can be more suitable for coastal areas.

Optionally, a sea sand cushion layer is arranged below the broken stone cushion layer.

By adopting the technical scheme, the sea sand needed by the sea sand cushion layer is directly from the local, so that the labor and financial resources can be saved.

Optionally, the cross section shapes of the sea sand cushion layer, the broken stone cushion layer and the embankment structure are all trapezoidal.

Through adopting above-mentioned technical scheme, set up to trapezoidal can make the embankment structure that is located ground better in sea sand bed course and rubble bed course support down the structure steadiness to improve the stability of coastal ground and trade the filling structure.

Optionally, the graded crushed stone cushion layer is a water-permeable cushion layer.

By adopting the technical scheme, the water in the foundation pores can be smoothly discharged under the action of filling load, so that the effect of draining groundwater is achieved, the consolidation of the foundation is quickened, and the embankment is protected from being soaked by the groundwater.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the foundation filling structure of the coastal silt area is characterized in that the pull-out net structures are distributed in the gravel cushion layer in an extending manner and combined with the gravel cushion layer, so that the filling strength of the gravel cushion layer can be effectively improved, the subsidence of the soft soil roadbed is reduced, and the bearing capacity of the roadbed is ensured;

2. the graded broken stone cushion layer enables water in the foundation pores to be smoothly discharged under the action of filling load, plays a role in draining groundwater, quickens the consolidation of the foundation and protects the embankment from being soaked by the groundwater.

Drawings

Fig. 1 is a schematic structural view of an embodiment of the present application.

Reference numerals illustrate:

1. a sea sand cushion layer; 2. a gravel cushion layer; 3. a drawknot net structure; 31. drawing a net layer; 32. a connecting rope; 33. a drawstring; 4. embankment structure.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses a foundation reclamation structure in a coastal silt area.

Referring to fig. 1, the foundation reclamation structure of the coastal silt region includes a sea sand cushion layer 1, a gravel cushion layer 2, a drawknot net structure 3 and a embankment structure 4 which are sequentially arranged from bottom to top, the sea sand cushion layer 1, the gravel cushion layer 2 are positioned below the ground, the embankment structure 4 is positioned above the ground, and a main body of the drawknot net structure 3 is positioned between the gravel cushion layer 2 and the embankment structure 4 and partially extends into the gravel cushion layer 2.

The sea sand cushion layer 1 is formed by pushing and paving sea sand, and the broken stone cushion layer 2 is formed by pushing and paving broken stone; in this embodiment, the cross section of the sea sand cushion layer 1 and the gravel cushion layer 2 is an inverted trapezoid, and the cross section of the embankment structure 4 is a regular trapezoid, so that the stability of the structure of the embankment structure 4 on the ground under the support of the sea sand cushion layer 1 and the gravel cushion layer 2 is better, and the stability of the coastal foundation filling structure is improved.

The pulling net structure 3 comprises a pulling net layer 31, a connecting rope 32 and a pulling rope 33, wherein the pulling net layer 31 is a net structure woven by maritime work ropes and is paved on the macadam cushion layer 2; the connecting ropes 32 and the drawknot ropes 33 are also marine ropes, the number of the connecting ropes 32 is set into a plurality of groups, one end of each connecting rope 32 is bound on the drawknot mesh layer 31, and the other end of each connecting rope extends vertically downwards into the crushed stone cushion layer 2; the plurality of the drawstring 33 are arranged in a group at intervals along the distribution direction of the connecting string 32, and are horizontally paved in the macadam cushion 2 in a radial shape. The broken stone cushion layer 2 is integrally tied from inside to outside by the tie net structure 3 so as to enhance the stability of the coastal foundation filling structure.

The coastal silt region foundation reclamation structure is mainly applied to soft soil foundations with soft soil depths within 3m, and the reclamation process is as follows:

the method comprises the steps of replacing and filling in sections, wherein the replacing and filling are carried out in a mode of excavating while pumping water, and the length of each section of replacing and filling is determined according to actual conditions and is controlled to be about 50 m; and excavating to a bearing layer with the design requirement of the drawing, and after the groove is tested, if the bearing capacity of the foundation on site cannot meet the design requirement of the drawing, continuing to excavate until the bearing layer with the design requirement of the drawing is reached, and then carrying out next filling construction.

Grading crushed stone matching layer: the graded broken stone cushion layer 2 is a water-permeable cushion layer, water in the foundation pores can be smoothly discharged under the action of filling load, the effect of draining groundwater is achieved, the consolidation of the foundation is quickened, and the embankment is protected from being soaked by the groundwater. The graded broken stone is subjected to sampling test after working, and indexes such as fineness modulus, harmful substance content and the like are mainly measured, so that the graded broken stone meets the specifications and design standards and can be used for roadbed backfilling construction.

Grading crushed stone layering, paving and leveling: the graded broken stone cushion layer 2 is filled in layers, the paving bulk of each layer is not more than 20cm, and the layers are compacted in layers. The connecting ropes 32 of the drawstring net structure 3 are layered in the graded broken stone cushion layer 2 and compacted together with the graded broken stone cushion layer 2.

Mechanical rolling: rolling is a key process for ensuring that the graded broken stone cushion layer 2 meets the compactness requirement. Rolling according to 'static pressure before vibration rolling'; light before heavy; slow first and fast second; the principle of "first two sides and then the middle". The rolling is generally 6-8 times until the surface has no obvious track. Road rollers and other vehicles are strictly prohibited from braking, turning around or cornering on the road section that is completed or being constructed. The rear wheels should overlap 1/2 of the wheel width when rolling. The field test personnel should strictly detect and control the compactness of the crushed stone matched with each level. And after the test supervision engineer checks the test result to be qualified, performing the construction of the next layer.

Backfill construction: after the construction of the graded broken stone cushion layer 2 is completed and the inspection and acceptance by a supervision engineer are qualified, backfill construction is timely carried out, the loose paving thickness of the backfill is not more than 30cm, and all technical indexes of the graded broken stone cushion layer are required to meet the specification and design requirements to form the embankment structure 4.

The foundation filling structure for the coastal silt area is characterized in that the pull-up net structures 3 are distributed in the gravel cushion layer 2 in an extending mode, then the pull-up net structures 3 and the gravel cushion layer 2 are compacted together, the filling strength of the gravel cushion layer 2 can be effectively improved, the sinking amount of a soft soil roadbed is reduced, and the bearing capacity of the roadbed is guaranteed.

The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.

Claims

1. The utility model provides a coastal silt district ground trades fills out structure which characterized in that: the road embankment structure comprises a broken stone cushion layer (2) positioned below the ground, a road embankment structure (4) positioned above the ground and a drawknot net structure (3) positioned between the broken stone cushion layer (2) and the road embankment structure (4), wherein the drawknot net structure (3) extends into the broken stone cushion layer (2) partially.

2. The coastal silt area foundation reclamation structure according to claim 1, wherein: the utility model provides a pull knot net structure (3) is including tiling pull knot net layer (31) on rubble bed course (2), ligature on pull knot net layer (31) stretch into connecting rope (32) in rubble bed course (2), and follow connecting rope (32) distribution direction interval arrangement's pull knot rope (33), pull knot rope (33) level is laid in rubble bed course (2).

3. The coastal silt area foundation reclamation structure according to claim 2, wherein: the drawstring (33) is distributed in a radial line shape.

4. The coastal silt area foundation reclamation structure according to claim 2, wherein: the knot layer (31), the connecting rope (32) and the knot rope (33) are all sea engineering ropes.

5. The coastal silt area foundation reclamation structure according to claim 1, wherein: a sea sand cushion layer (1) is arranged below the broken stone cushion layer (2).

6. The coastal silt area foundation reclamation structure according to claim 5, wherein: the cross sections of the sea sand cushion layer (1), the broken stone cushion layer (2) and the embankment structure (4) are trapezoidal.

7. The coastal silt area foundation reclamation structure according to claim 1, wherein: the broken stone cushion layer (2) is a water-permeable cushion layer.