CN111691392A - Backfill construction method for sludge texture foundation - Google Patents

Backfill construction method for sludge texture foundation Download PDF

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Publication number
CN111691392A
CN111691392A CN202010600091.8A CN202010600091A CN111691392A CN 111691392 A CN111691392 A CN 111691392A CN 202010600091 A CN202010600091 A CN 202010600091A CN 111691392 A CN111691392 A CN 111691392A
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China
Prior art keywords
geotextile
backfill
foundation
sludge
construction method
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CN202010600091.8A
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Chinese (zh)
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CN111691392B (en
Inventor
宋鑫
李明男
周桂军
王满
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Fourth Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd
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Fourth Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/005Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/06Foundation trenches ditches or narrow shafts
    • E02D17/12Back-filling of foundation trenches or ditches

Abstract

The invention belongs to the field of building construction, and particularly relates to a silt texture foundation backfill construction method, which comprises the following steps: cleaning, laying cloth, sewing, ditching and backfilling, firstly cleaning sundries such as weeds, tree roots and the like on the surface of the sludge layer, then laying geotextile on the surface of the sludge layer, sewing lap joints of the geotextile, excavating annular anchoring ditches around the geotextile, and finally filling the mixture to the anchoring ditches and the upper surface of the geotextile. The invention can ignore the uneven settlement of the foundation caused by the water content difference of the sludge layer by adopting the reinforced isolation layer, and can isolate the backfill material from the original soft sludge layer, so that the integrity of the backfill layer is higher, the backfill quality is effectively ensured, and the reinforcing effect of the soft foundation is better.

Description

Backfill construction method for sludge texture foundation
Technical Field
The invention belongs to the field of building construction, and particularly relates to a silt texture foundation backfill construction method.
Background
In the past, the treatment of soft foundation is one of the problems which are mainly solved in most construction projects. In a common treatment method, the traditional backfill compaction can cause uneven settlement of the foundation, the backfill engineering quantity and the manufacturing cost are improved, and the treatment effect is greatly influenced by the components, the grain size and the like of a backfill mixture. The above problems have been continuously felt by engineers in various projects, and a treatment method capable of reducing the cost and controlling and predicting the effect thereof is urgently needed, so that which method is adopted to treat the soft foundation becomes a key point of research of managers in various construction projects.
The foundation and foundation subsection engineering often encounter soft foundations such as silt and the like, and the foundation needs to be correspondingly treated before the upper structure is constructed, so that the stress condition of the foundation is improved. Generally, the mucky soil is treated by a method of backfilling and silt squeezing by using a mixture. Practice proves that the method can cause large foundation settlement, increase backfilling engineering quantity and influence construction period. In addition, the processing result is greatly influenced by the components, the grain diameter and the like of the backfill mixture, and the processing effect cannot be accurately predicted.
Therefore, the inventor provides a pipeline surface rust removal device by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.
Disclosure of Invention
The object of the present invention is to address several of the following disadvantages of the prior art:
1. the traditional backfill compaction construction has larger foundation settlement, increases the backfill engineering quantity and influences the construction period;
2. the water content of sludge layers in different areas is different in a natural state, the foundation is unevenly settled in the traditional backfilling construction, and the predictability and controllability of the stress condition and the development direction of the foundation after backfilling are lower;
3. the backfilled extruded sludge needs to be excavated and transported outside, and the construction cost is improved.
The mud texture foundation backfill construction method has the advantages of stable construction technology, capability of reducing foundation settlement and backfill amount, simplicity and convenience in construction, cost saving and construction period shortening.
In order to achieve the purpose, the invention adopts the following technical scheme: a backfill construction method for a sludge texture foundation comprises the following steps:
s1, cleaning, namely cleaning sundries such as weeds, tree roots and the like on the surface of the sludge layer;
s2, spreading cloth, namely spreading geotextile on the surface of the sludge layer;
s3, sewing, namely sewing the lap seams of the geotextile;
s4, digging a ditch, and digging annular anchoring ditches around the geotextile;
and S5, backfilling, and filling the mixture to the anchoring ditch and the upper surface of the geotextile.
In the above-mentioned silt foundation backfill construction method, the geotextile divides the silt layer into at least four regions according to the direction and lays respectively when laying, and the geotextiles in the same region are arranged in parallel and the lap joints of the adjacent regions are distributed in a zigzag manner.
In the above construction method for backfilling the silt foundation, the geotextile adopts butt joint type double-pass sewing, the butt joint length of the geotextile at two sides is not less than 50mm, and the distance between two sewing threads is 10-25 mm.
In the above construction method for backfilling a muddy foundation, the width of the anchoring trench is 300mm and the depth is 500 mm.
In the above construction method for backfilling the silt foundation, after the excavation of the anchoring ditch is finished, the edge of the geotextile is pressed into the anchoring ditch, and the anchoring ditch is slowly filled with the mixture to be backfilled, so that the surface of the geotextile is in a tight state.
In the above construction method for backfilling the silt foundation, when the mixture is backfilled, the backfilling sequence is that the periphery is first, then the embankment is filled, and finally the joint is filled.
Compared with the prior art, the silt foundation backfill construction method has the advantages that:
1. the filament woven geotextile (reinforced isolation layer) is simple and convenient to lay and construct, a large amount of labor is not needed, the tensile strength of the geotextile is high, and the geotextile is laid in one step and does not need to be repaired or replaced.
2. By using the reinforced isolation layer technology, the backfill and outward square amount can be greatly reduced, the construction period is effectively shortened, and the site backfill construction efficiency is improved compared with the prior art.
3. The reinforcement isolation layer can omit the uneven settlement of the foundation caused by the water content difference of the sludge layer, and the backfill material can be isolated from the original soft sludge layer, so that the integrity of the backfill layer is higher, the backfill quality is effectively ensured, and the reinforcing effect of the soft foundation is better.
4. The geotextile is divided into at least four areas to be laid respectively, so that the geotextile in the same area is arranged in parallel, and the lap joints of the adjacent areas are distributed in a zigzag manner, thereby not only improving the tensile resistance of the geotextile, but also being easier to fix the backfill mixture on two sides compared with the existing geotextile.
Drawings
FIG. 1 is a flow chart of a construction method for backfilling a sludge foundation provided by the invention;
FIG. 2 is a schematic diagram of the laying state of the geotextile in the construction method of the sludge texture base backfill provided by the invention;
FIG. 3 is a schematic diagram of the seaming and backfilling status of geotextiles in the construction method of backfilling a sludge foundation according to the present invention;
fig. 4 is a schematic view of a conventional geotextile in a laid state;
fig. 5 is a schematic view of a backfilling state using a conventional geotextile.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Examples
As shown in fig. 1-3, a backfill construction method for a sludge texture foundation comprises the following steps:
s1, cleaning, namely cleaning sundries such as weeds, tree roots and the like on the surface of the sludge layer;
s2, laying cloth, namely laying geotextile on the surface of the sludge layer, specifically, dividing the sludge layer into at least four regions according to the direction and laying the geotextile respectively when laying the geotextile, wherein the geotextile in the same region is arranged in parallel, and the lap joint of each adjacent region is distributed in a zigzag manner;
s3, sewing, namely sewing the lap seam of the geotextile, specifically, sewing by using a nylon thread through manually holding a portable sewing machine by hand, wherein the geotextile is sewn in a butt joint type double-way mode, the butt joint length of the geotextile at two sides is not less than 50mm, and the distance between the two sewing threads is 10-25 mm;
s4, ditching, wherein annular anchoring ditches are excavated around the geotextile, the shape of each anchoring ditch corresponds to the laying mode of the geotextile, namely the number of edges of each anchoring ditch is proportional to the number of the laying areas of the geotextile, if the silt layer is divided into four areas in the embodiment, each anchoring ditch can be quadrilateral, the width of each anchoring ditch is 300mm, the depth of each anchoring ditch is 500mm, the edges of the geotextile are pressed into the anchoring ditches after the ditching of each anchoring ditch is finished, and the anchoring ditches are slowly filled with the mixture to be backfilled to ensure that the surfaces of the geotextile are in a tight state;
and S5, backfilling, namely filling the mixture to the anchoring ditch and the upper surface of the geotextile, and filling the mixture in a backfilling sequence of four sides, embankment and joint filling.
It should be noted that, as shown in fig. 5, in the conventional geotextile laying method shown in fig. 4, a plurality of geotextiles are generally arranged in parallel, and during backfilling, in the longitudinal direction, both ends of each geotextile extend into the anchoring ditch for landfill fixation, so that the geotextiles can be well fixed, in the transverse direction, only the geotextiles at both sides can be landfill-fixed, and the geotextile at the middle part is loose and the geotextile at both sides are tight due to the large transverse pulling force borne by the joint of each geotextile, so that the geotextile is easy to separate along the joint due to uneven stress; in addition, when the concrete is buried, the corners of the concrete are easy to stack, and the fixing effect is poor.
According to the invention, by adopting the paving method shown in figure 2, the sludge layer is divided into four different areas, then the geotextiles in the areas are arranged side by side, so that the outer sides of the geotextiles are kept level and the inner sides of the geotextiles are arranged at equal-difference distances, the geotextiles are sequentially decreased from the middle to the two sides, the interval length between the adjacent geotextiles is the same as the width of the geotextile, the geotextiles in the adjacent areas are vertically arranged, and the geotextiles in the areas are arranged at the centers of the geotextiles in a shape of a Chinese character 'ji'.
As shown in fig. 3, the connecting lines between the geotextiles in the regions are zigzag, so that the geotextile can simultaneously resist the stretching force from the transverse direction and the longitudinal direction, compared with the existing geotextile laying mode, the geotextile can form a whole between the geotextiles, the balance of the transverse stretching force and the longitudinal stretching force is kept, in addition, the outer sides of the geotextiles can extend into the anchoring ditch, compared with the fixing mode of fig. 4, the design is more scientific and reasonable, the problem of overlarge transverse pulling force of the geotextile caused by landfill can be effectively avoided, gaps are reserved between adjacent regions, and the superposition interference between the geotextiles can not be caused.
The invention adopts the filament woven geotextile (reinforced isolation layer) to lay and construct more simply and conveniently, does not need a large amount of labor force, has higher tensile strength of the geotextile, is formed once after being laid, and does not need to be repaired or replaced; by using the reinforced isolation layer technology, the backfill and outward square amount can be greatly reduced, the construction period is effectively shortened, and the on-site backfill construction efficiency is improved compared with the prior art; the reinforced isolation layer can omit the uneven settlement of the foundation caused by the difference of the water content of the sludge layer, and can isolate the backfill material from the original soft sludge layer, so that the integrity of the backfill layer is higher, the backfill quality is effectively ensured, and the reinforcing effect of the soft foundation is better; the geotextile is divided into at least four areas to be laid respectively, so that the geotextile in the same area is arranged in parallel, and the lap joints of the adjacent areas are distributed in a zigzag manner, thereby not only improving the tensile resistance of the geotextile, but also being easier to fix the backfill mixture on two sides compared with the existing geotextile.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. The backfill construction method of the sludge texture foundation is characterized by comprising the following steps of:
s1, cleaning, namely cleaning sundries such as weeds, tree roots and the like on the surface of the sludge layer;
s2, spreading cloth, namely spreading geotextile on the surface of the sludge layer;
s3, sewing, namely sewing the lap seams of the geotextile;
s4, digging a ditch, and digging annular anchoring ditches around the geotextile;
and S5, backfilling, and filling the mixture to the anchoring ditch and the upper surface of the geotextile.
2. The mud foundation backfill construction method according to claim 1, wherein the geotextile divides the mud layer into at least four regions according to the direction and lays the four regions respectively when laying, the geotextiles in the same region are arranged in parallel, and the lap joints of the adjacent regions are distributed in a zigzag manner.
3. The backfill construction method for the sludge foundation according to claim 1, wherein the geotextile adopts butt joint type double-seam, the butt joint length of the geotextile at two sides is not less than 50mm, and the distance between two seam lines is 10-25 mm.
4. The backfill construction method for a sludge foundation according to claim 1, wherein the width of the anchoring ditch is 300mm and the depth is 500 mm.
5. The backfill construction method for the sludge foundation according to claim 1, wherein after excavation of the anchoring ditch is finished, the edge of the geotextile is pressed into the anchoring ditch, and the anchoring ditch is slowly filled with a mixture to be backfilled, so that the surface of the geotextile is in a tight state.
6. The backfill construction method for the sludge foundation according to claim 1, characterized in that when the mixture is backfilled, the backfill sequence is performed according to the steps of first filling the gaps around, then filling the gaps with embankments and finally filling the gaps with the mixture.
CN202010600091.8A 2020-06-28 2020-06-28 Backfill construction method for sludge texture foundation Active CN111691392B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100059209A (en) * 2008-11-26 2010-06-04 (주)지구환경전문가그룹 A drainage system for soft ground
CN102677632A (en) * 2012-04-26 2012-09-19 北京正和恒基滨水生态环境治理股份有限公司 River bottom anti-seepage treatment for geomembrane
CN203755293U (en) * 2014-01-27 2014-08-06 中铁二十二局集团第一工程有限公司 Vacuum preloading combined stacking system
CN107869138A (en) * 2017-11-28 2018-04-03 武汉冶建筑安装工程有限责任公司 High roadbed building stones Change and fill groundsill handles construction method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100059209A (en) * 2008-11-26 2010-06-04 (주)지구환경전문가그룹 A drainage system for soft ground
CN102677632A (en) * 2012-04-26 2012-09-19 北京正和恒基滨水生态环境治理股份有限公司 River bottom anti-seepage treatment for geomembrane
CN203755293U (en) * 2014-01-27 2014-08-06 中铁二十二局集团第一工程有限公司 Vacuum preloading combined stacking system
CN107869138A (en) * 2017-11-28 2018-04-03 武汉冶建筑安装工程有限责任公司 High roadbed building stones Change and fill groundsill handles construction method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
人民交通出版社编: "《公路定额及编制办法汇编(上册)》", 30 June 2002, 人民交通出版社 *

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Inventor after: Song Xin

Inventor after: Li Mingnan

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Inventor after: Huang Yunchang

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