CN111472359A - Method for replacing and filling peat soil soft foundation box culvert foundation - Google Patents
Method for replacing and filling peat soil soft foundation box culvert foundation Download PDFInfo
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- CN111472359A CN111472359A CN202010195939.3A CN202010195939A CN111472359A CN 111472359 A CN111472359 A CN 111472359A CN 202010195939 A CN202010195939 A CN 202010195939A CN 111472359 A CN111472359 A CN 111472359A
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- filling
- box culvert
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- peat soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
- E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Architecture (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a method for replacing and filling a peat soil soft foundation box culvert foundation, which comprises the following steps: measuring and lofting, and confirming an excavation area; excavating once from the first side of the box culvert foundation along the transverse and longitudinal center lines of the roadbed, after excavating to a specified elevation, firstly paving a geotextile isolation layer along the excavated slope from the basement, and then performing block stone replacement and filling layer by layer; excavating for the second time along the longitudinal direction of the roadbed and the transverse direction of the box culvert to two sides adjacent to the first side of the box culvert foundation until the excavation reaches the designed depth elevation and the preset width, and performing block stone replacement and filling layer by layer after laying geotextile isolation layers on two sides of a side slope of an excavation area; and carrying out layered backfilling and layered tamping on the excavated area, replacing and filling to the designed top elevation, and tamping and leveling again until the construction condition of the box culvert structure is reached. The invention can accelerate the field construction progress of the peat soil soft soil foundation, and the geotextile isolation layer is added to isolate the peat soil layer from the replacement block stone part, thereby avoiding the influence of mixing on the stability of the box culvert foundation.
Description
Technical Field
The invention relates to the technical field of box culvert construction, in particular to a method for replacing and filling a peat soil soft foundation box culvert foundation.
Background
At present, box culvert structure construction is common in all levels of roads, different methods are adopted for box culvert foundations based on different geological conditions, such as sand cushion layers, riprap sludge squeezing, PHC pipe piles and the like are adopted to improve the stability of the geological conditions, the construction method adopted for the peat soil soft foundation box culvert foundations is rare, the construction method in the prior art is adopted for constructing the peat soil soft foundation box culvert foundations, the production efficiency is low, and the quality is difficult to control.
Disclosure of Invention
In view of the above, the invention provides a method for replacement and filling construction of a peat soil soft foundation box culvert foundation, and aims to solve the problems that the quality is difficult to ensure and the construction efficiency is low in the existing construction process of the peat soil soft foundation box culvert foundation.
The invention provides a method for replacing and filling a peat soil soft foundation box culvert foundation, which comprises the following steps: step 1, measuring lofting and confirming an excavation area; step 2, excavating once from the first side of the box culvert foundation along the transverse and longitudinal center lines of the roadbed, after excavating to a specified elevation, firstly paving geotextile isolation layers along the excavated slope surface from the substrate, and then performing block stone replacement and filling layer by layer; step 3, performing secondary excavation on two sides adjacent to the first side of the box culvert foundation along the longitudinal direction of the roadbed and the transverse direction of the box culvert until the excavation reaches the designed depth elevation and the preset width, and performing block stone replacement and filling layer by layer after laying geotextile isolation layers on the side slopes on the two sides of the excavation area; and 4, carrying out layered backfilling and layered tamping on the excavated area, changing the backfilling to the designed top elevation, and tamping and leveling again until the construction condition of the box culvert structure is reached.
Further, in the method for the replacement and filling construction of the peat soil soft foundation box culvert foundation, in the step 2 and the step 3, the filling thickness of each layer of rock block is 0.5-1.0m, and the maximum diameter of the rock block is less than 0.5 m.
Further, in the method for the replacement and filling construction of the peat soil soft foundation box culvert foundation, in the step 2 and the step 3, when each layer of the stones is filled, the stones need to be tamped and leveled, and the gaps are filled with broken stones and rolled until the stones do not move obviously.
Further, in the method for the replacement and filling construction of the peat soil soft foundation box culvert foundation, settlement observation is required during the flat-filling and rolling of the rock blocks, and when the observed value is not more than 2mm, the filling is determined to be dense and stable.
Further, in the method for the replacement and filling construction of the peat soil soft foundation box culvert foundation, the rock blocks of each layer are filled into a trapezoid shape or a square shape.
Further, in the method for the replacement and filling construction of the peat soil soft foundation box culvert foundation, the geotextile isolation layer is laid along the block stone filling side slope from the bottom of the filled block stone until the preset position of the top of the platform.
Further, in the method for the replacement and filling construction of the peat soil soft foundation box culvert foundation, slope putting and tamping are carried out in the secondary excavation process.
Further, in the method for the replacement and filling construction of the peat soil soft foundation box culvert foundation, a temporary drainage ditch is dug near the excavation area to drain accumulated water.
Further, in the method for the peat soil soft foundation box culvert foundation replacement and filling construction, the unqualified soil is conveyed to the specified position in the primary excavation and secondary excavation processes.
Further, in the method for the replacement and filling construction of the peat soil soft foundation box culvert foundation, the filled position is used as a construction platform in the primary excavation and secondary excavation processes, and the filling process is promoted.
According to the method for the replacement and filling construction of the peat soil soft foundation box culvert foundation, rock block filling is carried out while digging in the two excavation processes, the site construction progress of the peat soil soft soil foundation can be accelerated, the post-construction stability of the peat soil soft soil foundation is effectively improved, the site construction method is standardized, the operability is high, and the economic effect is obvious; and increase geotechnological cloth isolation layer, keep apart peat soil layer and trade and fill the piece stone part, avoided the two to mix the stability that influences the box culvert foundation.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart of a method for replacing and filling a peat soil soft foundation box culvert foundation according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view illustrating box culvert foundation replacement provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of excavating, filling, and longitudinal filling of a box culvert foundation provided by an embodiment of the invention;
fig. 4 is a schematic diagram of excavating, filling, and transverse filling of a box culvert foundation according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, the method for replacing and filling the peat soil soft foundation box culvert foundation according to the embodiment of the invention comprises the following steps:
and step S1, measuring and lofting, and confirming an excavation area.
Specifically, the construction site is investigated, and after the site construction conditions are satisfied, the equipment can be moved into the construction site, and the excavation region 1 can be confirmed after the measurement and the lofting are performed on the basis of the construction drawing.
And step S2, excavating once from the first side of the box culvert foundation along the transverse and longitudinal center lines of the roadbed, after excavating to a specified elevation, paving geotextile isolation layers along the excavated slope from the basement, and then performing block stone replacement and filling layer by layer.
Referring to fig. 2 and 3, the direction shown by an arrow in fig. 3 represents the direction of excavating and filling the rock blocks, excavating along the longitudinal center line of the box culvert 2 in the length direction of the roadbed, detecting the soil quality in the excavating process, stopping excavating when the soil quality is a sandstone layer, then performing first-layer rock block filling, and sequentially performing subsequent filling of each layer of rock blocks after the first-layer rock block is densely filled, wherein the filling thickness of each layer of rock block is 0.5-1.0m, and the maximum diameter of the rock block is less than 0.5 m. The filled position can also be used as a construction platform, then the filling is pushed, and peat soil from swamps, wetlands and swamps is timely filled in the excavation process; or unqualified soil such as mud, tree stumps and rotten materials is conveyed to a designated position.
For convenience of construction, a temporary access is arranged on one side of the excavated area, and the first side a refers to a side of the box culvert foundation far away from the temporary access.
And step S3, secondary excavation is carried out on two sides adjacent to the first side of the box culvert foundation along the longitudinal direction of the roadbed and the transverse direction of the box culvert until the excavation reaches the designed depth elevation and the preset width, and block stone replacement and filling are carried out layer by layer after geotextile isolation layers are laid on two sides of a side slope of an excavation area.
Referring to fig. 2 and 4, the direction shown by the arrow in fig. 4 represents the direction of excavating and filling the rock blocks, and on the basis of the area filled by one-time excavation, excavation is respectively carried out on two sides of the roadbed in the width direction until the depth elevation and the actually required width are reached, the filling thickness of each layer of rock block is 0.5-1.0m, and the maximum diameter of the rock block is less than 0.5 m. The filled position can also be used as a construction platform, then filling is carried out, and unqualified soil is timely conveyed to a designated position in the excavation process.
In this embodiment, in the processes of primary excavation and secondary excavation, before filling the rock blocks, geotextile isolation layers need to be laid around the excavation region (i.e., the longitudinal sides of the roadbed and the two sides of the cross section of the roadbed) to isolate the rock blocks from the surrounding peat layers, and the rock blocks are filled in layers and can be used as a construction platform while the geotextile isolation layers are fixed. In this embodiment, the woodworking cloth isolation layer 3 is laid on the first side a, then the woodworking cloth isolation layer 3 is laid on two sides adjacent to the first side a, and finally the woodworking cloth isolation layer 3 is laid on the opposite side of the first side (i.e. the side close to the temporary walkway). In practice, when laying the woodworking cloth isolation layer 3, the earthwork cloth isolation layer 3 is laid along the block stone filling side slope from the bottom of the filling block stone until the preset position of the top of the platform. The predetermined position is a position adjacent to the structural mat 5 and the structural mat 5 may be laid out using C15 concrete.
In the process of secondary excavation, slope setting and tamping are carried out, and the slope can be piled up by sand bags or supported by steel sheet piles. The slope gradient can be determined according to actual conditions.
In the embodiment, in the processes of primary excavation and secondary excavation, when each layer of block stones is filled, the blocks need to be tamped and leveled, and broken stones are adopted to fill gaps and are rolled until the block stones do not move obviously. Wherein the adopted crushed stone has a particle size of less than 40 mm.
Preferably, during the flat filling and rolling of the rock blocks, settlement observation is required, when the observed value is not more than 2mm, the rock blocks are determined to be densely and stably filled, and then the next layer of rock blocks is filled.
In this embodiment, the way of digging and filling is adopted in the primary excavation and the secondary excavation, and the blocks and stones in each layer are filled into a trapezoidal shape or a square shape.
In this embodiment, water accumulation occurs during the primary excavation and the secondary excavation, the temporary drainage ditch 4 may be excavated near the excavation region 1, and the water accumulation in the excavation region is discharged to a river or a stream far from the construction site by using a water pump or a slurry pump, that is, the existing drainage ditch 6.
And step S4, carrying out layered backfilling and layered tamping on the excavated area, changing the backfilling to the designed top elevation, and tamping and leveling again until the construction condition of the box culvert structure is reached.
Specifically, both sides of the box culvert foundation need to be filled with qualified soil (such as sea sand and other materials with strong permeability), leveled and tamped. And (4) after the block stones are filled to the designed top elevation, rolling and tamping to obtain the construction conditions of the culvert cushion layer and the culvert structure.
The method for replacing and filling the peat soil soft foundation box culvert foundation provided by the embodiment obviously has the advantages that the excavation and rock filling are carried out simultaneously in the two excavation processes, the site construction progress of the peat soil soft soil foundation can be accelerated, the post-construction stability of the peat soil soft soil foundation is effectively improved, the site construction method is standardized, the operability is strong, and the economic effect is obvious; and increase geotechnological cloth isolation layer, keep apart peat soil layer and trade and fill the piece stone part, avoid the two to mix the stability that the back influences the box culvert foundation.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for replacing and filling a peat soil soft foundation box culvert foundation is characterized by comprising the following steps:
step 1, measuring lofting and confirming an excavation area;
step 2, excavating once from the first side of the box culvert foundation along the transverse and longitudinal center lines of the roadbed, after excavating to a specified elevation, firstly paving geotextile isolation layers along the excavated slope surface from the substrate, and then performing block stone replacement and filling layer by layer;
step 3, performing secondary excavation on two sides adjacent to the first side of the box culvert foundation along the longitudinal direction of the roadbed and the transverse direction of the box culvert until the excavation reaches the designed depth elevation and the preset width, and performing block stone replacement and filling layer by layer after laying geotextile isolation layers on two sides of a side slope of an excavation area;
and 4, carrying out layered backfilling and layered tamping on the excavated area, changing the backfilling to the designed top elevation, and tamping and leveling again until the construction condition of the box culvert structure is reached.
2. The method for the replacement and filling construction of the peat soil soft foundation box culvert foundation according to claim 1, wherein in the step 2 and the step 3, the filling thickness of each layer of rock block is 0.5-1.0m, and the maximum diameter of the rock block is less than 0.5 m.
3. The method for replacing and filling a peat soil soft foundation box culvert foundation according to claim 1, wherein in the step 2 and the step 3, when each layer of rock is filled, the rock needs to be tamped and leveled, and broken stones are adopted to fill gaps and are rolled until the rock blocks do not move obviously.
4. The method for replacing and filling a peat soil soft foundation box culvert foundation according to claim 3, wherein settlement observation is required during the leveling and rolling of the rock block filling, and when the observed value is not more than 2mm, the filling is determined to be dense and stable.
5. The method for the replacement and filling construction of the peat soil soft foundation box culvert foundation according to claim 1, wherein the blocks are filled into a trapezoid shape or a square shape.
6. The method for the replacement and filling construction of the peat soil soft foundation box culvert foundation according to claim 1, wherein the geotextile isolation layers are laid along the filled side slopes of the filled rock blocks from the bottom of the filled rock blocks to the preset position of the top of the platform.
7. The method for the replacement and filling construction of the peat soil soft foundation box culvert foundation according to claim 1, wherein the slope is set down and tamped in the secondary excavation process.
8. The method for peat soil soft foundation box culvert foundation replacement and filling construction according to claim 7, characterized in that temporary drainage ditches are dug near the excavation area to drain off the accumulated water.
9. The method for the replacement and filling construction of the peat soil soft foundation box culvert foundation according to claim 1, wherein the unqualified soil is transported to a designated position during the primary excavation and the secondary excavation.
10. The method for replacing and filling a peat soil soft foundation box culvert foundation according to claim 1, wherein a filling process is advanced by using a filled position as a construction platform in the primary excavation and the secondary excavation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010195939.3A CN111472359A (en) | 2020-03-19 | 2020-03-19 | Method for replacing and filling peat soil soft foundation box culvert foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010195939.3A CN111472359A (en) | 2020-03-19 | 2020-03-19 | Method for replacing and filling peat soil soft foundation box culvert foundation |
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| CN111472359A true CN111472359A (en) | 2020-07-31 |
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| CN202010195939.3A Pending CN111472359A (en) | 2020-03-19 | 2020-03-19 | Method for replacing and filling peat soil soft foundation box culvert foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356176A (en) * | 2021-07-15 | 2021-09-07 | 重庆尚源建筑景观设计有限公司 | Soft foundation treatment method |
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| DE29723313U1 (en) * | 1997-08-04 | 1998-08-20 | Leonhard Weiss Gmbh & Co Niederlassung Crailsheim, 74564 Crailsheim | Trench excavation and treatment facility |
| US20070212173A1 (en) * | 2006-03-07 | 2007-09-13 | Schellhorn Verne L | Method and apparatus for building reinforced sea walls and levees |
| CN102383413A (en) * | 2011-08-31 | 2012-03-21 | 东北大学 | Method for constructing strengthened saturated-flow plastic silt soft soil foundation |
| CN106884427A (en) * | 2017-03-30 | 2017-06-23 | 中交第四航务工程勘察设计院有限公司 | Immersed tube tunnel and immersed tube tunnel changeover portion soft soil foundation reinforcing method under water |
| CN110284386A (en) * | 2019-06-28 | 2019-09-27 | 中国二十冶集团有限公司 | Improve the method for the soft soil roadbed intensity of peat soil |
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2020
- 2020-03-19 CN CN202010195939.3A patent/CN111472359A/en active Pending
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| DE29723313U1 (en) * | 1997-08-04 | 1998-08-20 | Leonhard Weiss Gmbh & Co Niederlassung Crailsheim, 74564 Crailsheim | Trench excavation and treatment facility |
| US20070212173A1 (en) * | 2006-03-07 | 2007-09-13 | Schellhorn Verne L | Method and apparatus for building reinforced sea walls and levees |
| CN102383413A (en) * | 2011-08-31 | 2012-03-21 | 东北大学 | Method for constructing strengthened saturated-flow plastic silt soft soil foundation |
| CN106884427A (en) * | 2017-03-30 | 2017-06-23 | 中交第四航务工程勘察设计院有限公司 | Immersed tube tunnel and immersed tube tunnel changeover portion soft soil foundation reinforcing method under water |
| CN110284386A (en) * | 2019-06-28 | 2019-09-27 | 中国二十冶集团有限公司 | Improve the method for the soft soil roadbed intensity of peat soil |
Non-Patent Citations (3)
| Title |
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| 朱有初: "《碎石换填技术在软弱地基处理中的应用》", 《广东建材》 * |
| 林鸣等: "《润扬长江公路大桥北索塔北锚碇工程施工技术》", 30 September 2003, 中国建筑工业出版社 * |
| 韩书斌: "《高速公路盖板箱涵施工要点分析》", 《山西建筑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356176A (en) * | 2021-07-15 | 2021-09-07 | 重庆尚源建筑景观设计有限公司 | Soft foundation treatment method |
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Application publication date: 20200731 |