CN114508012B - Fine sand soil body on-site solidification roadbed and construction method thereof - Google Patents
Fine sand soil body on-site solidification roadbed and construction method thereof Download PDFInfo
- Publication number
- CN114508012B CN114508012B CN202210077099.XA CN202210077099A CN114508012B CN 114508012 B CN114508012 B CN 114508012B CN 202210077099 A CN202210077099 A CN 202210077099A CN 114508012 B CN114508012 B CN 114508012B
- Authority
- CN
- China
- Prior art keywords
- steel
- fine sand
- steel plate
- solidification
- vertical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000004576 sand Substances 0.000 title claims abstract description 98
- 239000002689 soil Substances 0.000 title claims abstract description 58
- 238000010276 construction Methods 0.000 title claims abstract description 37
- 238000007711 solidification Methods 0.000 title claims abstract description 26
- 230000008023 solidification Effects 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 238000011065 in-situ storage Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 163
- 239000010959 steel Substances 0.000 claims description 163
- 239000000843 powder Substances 0.000 claims description 26
- 239000002245 particle Substances 0.000 claims description 18
- 238000011049 filling Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 210000001624 hip Anatomy 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 13
- 238000002156 mixing Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 7
- 239000004575 stone Substances 0.000 description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Agronomy & Crop Science (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Road Paving Structures (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a fine sand soil body on-site solidification roadbed and a construction method thereof, belonging to the technical field of road engineering, comprising a drainage cushion layer and a solidification layer positioned above the drainage cushion layer, wherein the solidification layer is formed by stirring fine sand and a solidification agent; the embankment template is in-situ constructed into the cavity filled by the embankment, and the drainage cushion layer is arranged at the bottom of the cavity, so that the structure is simple. According to the construction method, the embankment template is in-situ constructed into the cavity filled by the embankment, and the drainage cushion layer is arranged at the bottom of the cavity, so that fine sand can be directly injected into the cavity of the embankment to realize primary drainage, after the water content is reduced to the optimal water content, the curing agent is added and stirred, the mixing is performed by utilizing the characteristic that the fine sand is easy to liquefy, so that the mixing uniformity and the material workability are ensured, and then the curing of the fine sand is performed, so that the cured embankment is finally formed, the working procedures are few, the construction speed is high, and the influence of weather factors is small.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to a fine sand soil body on-site solidification roadbed and a construction method thereof.
Background
The outside-in economies have evolved and the infrastructure is being built in unprecedented climax in coastal areas. While the infrastructures of ports and wharfs must be built off-shore, so that land construction is often required around the sea, and sand is blown into the sea to become land. The sand is generally in a loose state after being filled, cannot meet the requirements of bearing capacity, sedimentation control and liquefaction prevention, and must be reinforced through a foundation to meet engineering requirements.
And with the rapid development of the construction of the high-grade highways, the land resource contradiction that people reduce gradually is aggravated. In order to save non-renewable land resources, a road with sustainable development is walked, and the embankment filling materials of many high-grade highways select sand filling, and in the sand filling embankment, more and less sand filling with medium coarse sand is generally adopted for filling. The reason is mainly that the fine sand embankment is not easy to compact and loose after compaction, and the dynamic load of the vehicle has great influence on the strength and deformation of the embankment. However, in some areas, particularly coastal areas of China, fine sand has to be used in large quantities as a filler for high-grade highway embankments due to factors such as geographical environment and engineering cost.
On the other hand, the road engineering construction scale of China is expanding year by year. The development of road engineering construction makes the demand of roadbed filling great. However, high-quality fillers such as sand and stone can be obtained by adopting methods such as sand collection on a riverbed, mountain and stone collection, and the like, the original natural ecological environment is destroyed, and sand and stone resources are increasingly scarce.
The utilization of the fine sand as roadbed filler after the solidification treatment is an important way for solving the problems. By adding the curing material, water and clay minerals in the fine sand and the curing material are subjected to physical and chemical reaction, so that the engineering property of the fine sand is improved, and the fine sand curing soil formed by treatment is used as roadbed filler. The treatment method has the advantages of large treatment capacity and short treatment time, can consume a great amount of fine sand, can be used for locally taking materials in coastal area construction, realizes the recycling of the fine sand, and has important significance for environmental protection and ecological civilization construction.
At present, a technology for pouring embankment by using fluid-state solidified soil is adopted, and a concrete construction method is that fine powder sand is poured into a fine powder sand pool which is built in advance, a curing agent is added, and the embankment pouring is carried out after the fine powder sand is formed into the fluid-state solidified soil which accords with the regulations.
The fine sand is solidified and then used as roadbed filling material to form a solidified soil roadbed, and a dynamic compaction method and a vibroflotation method are mainly adopted at present. However, the dynamic compaction method has larger vibration in the construction process, is not suitable for areas relatively close to buildings and structures, and is easy to generate disturbance and disturb people.
Disclosure of Invention
The invention aims to: in order to solve the problems in the prior art, the invention provides a fine sand soil body on-site solidification roadbed; the invention also provides a construction method with few working procedures, and the construction period and the engineering quality can be well balanced.
The technical scheme is as follows: in order to achieve the aim of the invention, the fine sand soil body on-site solidified roadbed comprises a drainage cushion layer and a solidified layer positioned above the drainage cushion layer, wherein the solidified layer is formed by stirring fine sand and a solidifying agent; the particle content of the fine powder sand with the particle size of more than 0.075mm exceeds 50% of the total weight of the fine powder sand soil body, and the particle content of more than 0.075mm is lower than 75% of the total weight of the fine powder sand soil body. The addition amount of the curing agent is required to be in accordance with the set curing parameters, and the curing agent can be added by referring to the addition amount range value of the curing agent in the prior art. The invention is characterized in that the roadbed is formed by stirring fine sand and a curing agent in situ, and the roadbed is cured in situ by adopting fine sand soil body without extra steps.
Further, the curing agent is cement and/or lime.
Further, the construction method for the in-situ solidification of the fine sand soil body comprises the following steps:
1) Paving a drainage cushion layer with the thickness of 0.3-0.7m above foundation soil in the limit line of a construction site;
2) Inserting a vertical steel plate into foundation soil for 0.5-1m depth, wherein the vertical steel plate is fixed through a supporting frame, a cavity is formed after the vertical steel plate is enclosed, and the cavity is positioned above the drainage cushion layer;
3) Injecting fine sand into the cavity, standing, opening a drain valve, and pumping water from the cavity by adopting a vacuum pump and the drain valve;
4) Monitoring the change of the water content of the fine powder sand in the cavity, and adding a curing agent into the fine powder sand after the water content is reduced to the set water content to obtain a cured layer;
5) After the strength of the solidified layer reaches a set value, pulling up the vertical steel plate for recovery; setting up templates at two sides of the formed roadbed main body, and filling embankment slopes in a fluid state solidified soil pouring mode.
Further, in the step 2), the supporting frame is located outside the cavity; the support frame is trapezoidal, the support frame includes first steel pipe, rotatory reinforcing bar, spacer bar, second steel pipe, first horizontal reinforcing bar, second horizontal reinforcing bar, rotatory reinforcing bar inserts and is used for welded first steel pipe, the spacer bar inserts the second steel pipe that is used for the location, through being the welding of the first horizontal reinforcing bar, the second horizontal reinforcing bar of two waists of trapezoidal support frame between rotatory reinforcing bar and the spacer bar.
Further, the first transverse steel bars, the second transverse steel bars, the rotary steel bars and the positioning steel bars are all steel bars with the diameter of mm respectively; the first steel pipe and the second steel pipe are respectively steel pipes with the outer diameter of 16mm and the inner diameter of 14 mm.
Further, in the step 2), the support frame welded on the vertical steel plate is rotated to be vertical to the vertical steel plate, the first steel pipe inserted with the rotating steel bar is welded with the vertical steel plate, the welding position is at least 1m away from the bottom end of the vertical steel plate, and the support frame is fixed so as not to rotate any more; the rotary steel bar rotates to be vertically fixed with the vertical steel plate when in use, and rotates to be attached to the vertical steel plate when not in use.
Further, a round hole with the diameter of the drain valve is formed in the position, 0.7-1m away from the bottom end of the vertical steel plate, a pull-up hole is formed in the top of the vertical steel plate, and a sealing strip is arranged in the vertical steel plate.
Further, the stainless steel plate with the thickness of 50-100mm is 2-3m long and is more than or equal to 3m high; the number of the vertical steel plates is four, and the four vertical steel plates are enclosed to form a rectangular cavity.
Further, the drain valve is formed by overlapping two identical steel sheets with holes, the steel sheets are mounted in advance before the vertical steel sheets are inserted, a control handle is welded on the outer steel sheets, and after fine sand is injected and stands, the control handle is rotated to enable the holes of the two steel sheets to coincide for draining; after the water is discharged, the control handle is rotated, the water discharge hole is blocked by the adjacent steel sheet, and water is not discharged any more; the main body of the drain valve adopts a drill bit with the diameter of 3-5mm to open three equally-spaced oval holes on the steel edge, and the manufactured drain valve is installed in a round hole reserved in a vertical steel plate.
Further, in the step 4), the fine powder sand and the curing agent are stirred using a stirrer 15.
The beneficial effects are that: compared with the prior art, the fine sand soil body on-site solidified roadbed comprises a drainage cushion layer and a solidified layer positioned above the drainage cushion layer, wherein the solidified layer is formed by stirring fine sand and a solidifying agent; the grain content of the fine sand with the grain diameter of more than 0.075mm exceeds 50% of the total weight of the fine sand soil body, and the grain content of more than 0.075mm is less than 75% of the total weight of the fine sand soil body. According to the construction method, the fine powder sand is poured into the roadbed cavity formed by the roadbed template in-situ construction, the solidification agent is added after the fine powder sand is dehydrated to stir on site to form the solidified soil roadbed, the fine powder sand can be directly poured into the embankment cavity to realize primary drainage, after the water content is reduced to the optimal water content, the solidification agent is added and stirred, mixing is carried out by utilizing the characteristic that the fine powder sand is easy to liquefy, so that mixing uniformity and material workability are ensured, and then curing of the solidified fine powder sand is carried out to finally form the solidified soil embankment. The construction method disclosed by the invention has the advantages of few working procedures, high construction speed and small influence by weather factors, can be used for rapidly completing the filling of embankment, reducing the slope angle, reducing the earthwork quantity, and well balancing the relation among the construction period, the engineering quality and the engineering investment, and the vertical steel plate can be recycled, so that the method is environment-friendly.
Drawings
FIG. 1 is a top view of a steel plate after construction;
FIG. 2 is a schematic structural view of a support frame;
FIG. 3 is a schematic view of a structure of a vertical steel plate;
FIG. 4 is a schematic view of a drainage mat;
FIG. 5 is a schematic view of a support bracket installation process;
FIG. 6 is a schematic illustration of the addition of fine sand to a cavity;
FIG. 7 is a schematic view of a blender;
FIG. 8 is a schematic view of a plug pin;
FIG. 9 is a schematic view of a recycled vertical steel sheet;
FIG. 10 is a schematic view after construction is completed;
The reference numerals are: 1-vertical steel plate, 2-sealing strips, 3-drain valve, 4-control handle, 5-up hole, 6-first steel pipe, 7-rotating steel bar, 8-positioning steel bar, 9-second steel pipe, 10-first transverse steel bar, 11-second transverse steel bar, 12-drainage cushion layer, 13-fine sand, 14-vacuum pump, 15-stirrer, 16-plug pin, 17-base and 18-support frame.
Detailed Description
The structure and performance of the present invention will be further described with reference to the accompanying drawings.
It is to be understood that these examples are for the purpose of illustrating the application only and are not to be construed as limiting the scope of the application, since modifications to the application, which are various equivalent to those skilled in the art, will fall within the scope of the application as defined in the appended claims after reading the application.
The building foundation design Specification (GB 50007-2002) states that earth with a particle size greater than 0.075mm and a particle content exceeding 50% by weight is known as silt. Powder sand content: particles with the particle diameter of more than 0.075mm are more than 50%; fine sand content: particles with a particle size greater than 0.075 >75%; fine sand content: particles with a particle size of more than 0.075mm are 75% >50% in content. The content of the particles with the particle size of more than 0.075mm in the fine sand soil body, namely the fine sand 13, exceeds 50% by weight, and the content of the particles with the particle size of more than 0.075mm is lower than 75% by weight. The total weight is the weight of the sampled fine sand soil body.
The on-site solidification roadbed for fine sand soil body comprises a solidification layer with determined thickness and strength, a vertical steel plate 1, a trapezoid support frame 2, a drainage cushion layer 12 and a drainage valve 3.
Paving a drainage cushion layer 12 with a certain thickness in a embankment filling cavity formed by the vertical steel plate 1 in-situ, then injecting fine sand 13 into the cavity, simultaneously opening a drainage valve 3, pumping water outwards by using a vacuum pump 14, adding a curing agent into the fine sand 13 after the water content of the fine sand 13 is reduced to a target value, and simultaneously adopting a stirrer 15 to stir in situ to form the solidified soil embankment of the area.
Firstly, determining the thickness and strength of a solidified layer of a fine sand soil body on-site solidified roadbed, and calculating the ultimate bearing capacity of the foundation according to a double-layer foundation bearing capacity theory by adopting the following formula:
fu＝c1Nm+q
β＝BL/[2(B+L)H]kc
kc＝c2/c1
Wherein: f u -ultimate bearing capacity of foundation, kPa;
c 1 -the non-draining shear strength of the bearing layer soil, kPa;
N m -the corrected bearing capacity coefficient taking into account the effect of the layered soil;
c 2 -non-drainage shear strength of lower strata, kPa;
N csr —the taisha-based load-bearing coefficient and the base shape coefficient, respectively;
B, L, width and length of foundation, m;
H, the thickness of a solid soil layer below the substrate, namely the thickness of a solidified soil layer, m;
beta-punching shear coefficient;
k c -the ratio of the non-drainage shear strength of the two layers of soil;
q-overload on both sides of the foundation, kPa;
From the above formula, the bearing capacity of the double-layer foundation is related to the bearing capacity coefficient and the non-drainage shearing strength of the bearing layer. The bearing capacity coefficient is related to the load size, the treatment thickness and the ratio of the non-drainage shearing strength of the upper layer and the lower layer, and the treatment thickness meeting the bearing capacity requirement can be obtained.
On the premise of knowing the treatment thickness, the design structures of the vertical steel plate 1, the supporting frame 18, the drainage mat 12 and the drainage valve 3 are carried out.
As shown in figure 1, a round hole with the diameter of the drain valve 3 is arranged at the position 0.7-1m away from the bottom end (not less than the height of the drainage cushion layer), the top of the vertical steel plate 1 is provided with an upward pulling hole 5, and the vertical steel plate 1 can be made of common carbon steel or stainless steel materials. The sealing strips 2 are arranged in the vertical steel plates 1, and the sealing strips 2 are made of rubber materials, so that slurry leakage at joints of the steel plates is avoided.
The second steel pipe 9 is a positioning steel pipe. The first steel pipe 6 is a welded steel pipe.
As shown in fig. 2, the support frame 18 is in a right trapezoid shape formed by combining steel bars and steel pipes, and the rotating steel bars 7 are inserted into the first steel pipes 6 and then welded with other steel bars and the second steel pipes 9. The support frame 18 is trapezoidal, and the support frame 18 can rotate to be fixed with vertical steel sheet 1 vertically when using, can rotate to and laminate with the steel sheet when not using, is convenient for transport.
As shown in fig. 3, the drain valve 3 is formed by overlapping two identical steel sheets with holes, and the steel sheets are mounted in advance before the vertical steel plate 1 is inserted, and can be made of stainless steel or other materials. A stainless steel control handle 4 is welded on the outer steel sheet, and when fine sand 13 is injected and stands, the control handle 4 is rotated to enable holes of the two steel sheets to coincide for drainage; after the water is drained, the handle is rotated, the water drain hole is blocked by the adjacent steel sheet, and water is not discharged.
As shown in fig. 4, the drainage mat 12 adopts a well graded broken stone or sand mat as a mat for solidifying the earth embankment, and simultaneously blocks the solid phase in the fine sand 13, thereby facilitating precipitation of the fine sand 13.
As shown in fig. 5 to 10, the construction method for the in-situ solidification of the fine sand soil body comprises the following steps:
Firstly, paving a drainage cushion layer 12 with good gradation and thickness of 0.3-0.7m in the range of a side line of a construction site, and compacting crushed stone soil to meet the standard requirements;
Secondly, controlling the verticality of the vertical steel plates 1, inserting the four vertical steel plates 1 into foundation soil for 0.5-1m deep in a manual mode, then rotating a support frame 18 welded on the vertical steel plates 1 to be vertical to the vertical steel plates 1, inserting reinforcing steel bars into the second steel pipes 9, wherein the penetration depth of the reinforcing steel bars is not less than the thickness of a cushion layer, and fixing the support frame 18 so that the support frame is not rotated;
step three, injecting fine sand 13 into a cavity of the vertical steel plate 1 in-situ structure, opening the drain valve 3 after standing, and pumping water outwards by adopting a vacuum pump 14 in cooperation with the drain valve 3;
Monitoring the change of the water content of the fine powder sand 13 in the cavity, adding curing agents such as cement, lime and the like into the fine powder sand 13 after the water content is reduced to the optimal water content, and fully stirring the fine powder sand 13 and the curing agents by using a stirrer 15; the mixer 15 can be raised by a base 17;
And fifthly, after the strength of the solidified soil embankment meets the requirement, the vertical steel plate 1 is pulled up and recovered through the pulling-up holes 5. Setting up templates at two sides of the formed roadbed main body, and filling the embankment side slope in a fluid state solidified soil pouring mode.
Examples
The fine sand soil body on-site solidification roadbed comprises preparation of a drainage cushion layer 12 and fine sand 13, manufacture of a vertical steel plate 1, a support frame 18 and a drainage valve 3 and a construction method thereof, and firstly manufacture of the vertical steel plate 1.
(1) And manufacturing the vertical steel plate 1. Stainless steel plate with the thickness of 50-100mm is selected, the length is 2-3m, and the height is at least 3m. Manually cutting round holes with the diameter of 15mm at intervals of 20mm horizontally at a position which is 0.7-1m (not less than the height of the drainage pad layer) away from the bottom of the steel plate by adopting an electric drill with the diameter of 10mm for installing a drainage valve 3 later; a drill with the diameter of 5mm is preferably used for cutting an upward hole 8-10cm away from the top of the steel plate; sealing strips 2 are vertically attached to two sides of the vertical steel plate 1 and used for preventing slurry leakage at joints of the vertical steel plate 1, the sealing strips 2 are made of rubber materials and are fixed to edges of the vertical steel plate 1 in a hot rolling bonding mode.
(2) And (5) manufacturing a supporting frame 18. The steel bars and the steel pipes of the supporting frame 18 are made of carbon steel. The supporting frame 18 is composed of three steel bars and two steel pipes, firstly, the rotating steel bar 7 is inserted into the first steel pipe 6 to be welded on the vertical steel plate 1, and then the rotating steel bar 7 is welded with the steel bars (the first transverse steel bar 10 and the second transverse steel bar 11) serving as two waists of the trapezoid supporting frame 18 and the second steel pipe 9 serving as the shorter bottom edge of the trapezoid. And finally, welding the first steel pipe 6 inserted with the rotary steel bar 7 with the vertical steel plate 1, wherein the welding position is at least 1m away from the bottom end of the vertical steel plate 1, and manufacturing and installing the support frame 18 are completed. The steel bar adopts 12mm, and the steel pipe adopts external diameter 16mm, internal diameter 14mm.
(3) And (3) manufacturing the drain valve 3. The main body of the drain valve 3 adopts two steel sheets with the same size and structure, stainless steel materials are selected, three equally-spaced oval holes with the same size are formed in the steel edge by adopting a drill bit with the diameter of 3-5mm, and a control handle 4 is welded on the outer steel sheet, and is used for controlling the opening and closing of the drain valve 3. And installing the manufactured drain valve 3 in a reserved round hole of the vertical steel plate 1, and completing the manufacture and installation of the drain valve 3.
After the manufacturing of the device is finished and the preparation of the fine sand 13 and the drainage cushion layer 12 is finished, the construction of the soil body on-site solidification roadbed is carried out. And selecting a certain to-be-constructed road section lacking conventional roadbed filling materials, wherein the design height of the road embankment of the section is 2m, the length of the standard road section is 200m, the scale of a construction area is 2 x 2m, and calculating the thickness of a solidified layer of the construction area.
The construction method for the fine sand soil body on-site solidification roadbed comprises the following steps:
Firstly, paving a drainage cushion layer 12 with good gradation and 0.5m thickness in the range of a side line of a construction site, and compacting crushed stone soil to meet the standard requirements;
Secondly, controlling the verticality of the vertical steel plates 1, inserting the four vertical steel plates 1 into foundation soil for 0.5m deep in a manual mode, then rotating a support frame 18 welded on the vertical steel plates 1 to be vertical to the vertical steel plates 1, inserting reinforcing steel bars into the second steel pipes 9, wherein the depth of the reinforcing steel bars entering the soil is not less than the thickness of a cushion layer, and fixing the support frame 18 so that the support frame 18 does not rotate any more;
step three, injecting fine sand 13 into a cavity of the vertical steel plate 1 in-situ structure, opening the drain valve 3 after standing, and pumping water outwards by adopting a vacuum pump 14 in cooperation with the drain valve 3;
Monitoring the change of the water content of the fine powder sand 13 in the cavity, adding curing agents such as cement, lime and the like into the fine powder sand 13 after the water content is reduced to the optimal water content, and fully stirring the fine powder sand 13 and the curing agents by using a stirrer 15;
And fifthly, after the strength of the solidified soil embankment meets the requirement, the vertical steel plate 1 is pulled up and recovered through the pulling-up holes 5. Setting up templates at two sides of the formed roadbed main body, and filling the embankment side slope in a fluid state solidified soil pouring mode.
Claims (3)
1. The construction method for the fine sand soil body on-site solidification roadbed is characterized in that the fine sand soil body on-site solidification roadbed comprises a drainage cushion layer (12) and a solidification layer positioned above the drainage cushion layer (12), and the solidification layer is formed by stirring fine sand (13) and a solidification agent; the particle content of the fine powder sand (13) with the particle size of more than 0.075mm exceeds 50% of the total weight of the fine powder sand soil body, and the particle content of more than 0.075mm is less than 75% of the total weight of the fine powder sand soil body; the curing agent is cement and/or lime; the thickness of the drainage cushion layer (12) is 0.3-0.7m, the drainage cushion layer is directly paved above foundation soil, the fine sand soil body is directly solidified on the drainage cushion layer (12) on site to form a solidified layer, wherein during solidification, excessive water in the fine sand soil body is firstly discharged, then a solidifying agent is added, and stirring and solidification are carried out to form the solidified layer;
The method comprises the following steps:
1) A drainage cushion layer (12) with the thickness of 0.3-0.7m is paved above foundation soil within the limit of the scribing of a construction site;
2) Inserting a vertical steel plate (1) into foundation soil for 0.5-1m depth, wherein the vertical steel plate (1) is fixed through a supporting frame (18), a cavity is formed after the vertical steel plate (1) is enclosed, and the cavity is positioned above the drainage cushion layer (12);
3) Injecting fine sand (13) into the cavity, standing, opening a drain valve (3), and pumping water from the cavity by adopting a vacuum pump (14) and the drain valve (3);
4) Monitoring the change of the water content of the fine powder sand (13) in the cavity, and adding a curing agent into the fine powder sand (13) after the water content is reduced to the set water content to obtain a cured layer;
5) After the strength of the solidified layer reaches a set value, pulling up and recovering the vertical steel plate (1); erecting templates on two sides of the formed roadbed main body, and filling embankment slopes in a fluid state solidified soil pouring mode; in the step 2), the supporting frame (18) is positioned outside the cavity; the support frame (18) is trapezoid, the support frame (18) comprises a first steel pipe (6), a rotary steel bar (7), a positioning steel bar (8), a second steel pipe (9), a first transverse steel bar (10) and a second transverse steel bar (11), the rotary steel bar (7) is inserted into the first steel pipe (6) for welding, the positioning steel bar (8) is inserted into the second steel pipe (9) for positioning, and the rotary steel bar (7) and the positioning steel bar (8) are welded through the first transverse steel bar (10) and the second transverse steel bar (11) serving as two waists of the trapezoid support frame (18);
The first transverse steel bars (10), the second transverse steel bars (11), the rotary steel bars (7) and the positioning steel bars (8) respectively adopt steel bars with the diameter of 12 mm; the first steel pipe (6) and the second steel pipe (9) respectively adopt steel pipes with the outer diameter of 16mm and the inner diameter of 14 mm;
In the step 2), the supporting frame (18) is rotated to be vertical to the vertical steel plate (1), a first steel pipe (6) inserted with a rotating steel bar (7) is welded with the vertical steel plate (1), and the welding position is at least 1m away from the bottom end of the vertical steel plate (1);
A round hole with the diameter of the drain valve (3) is formed in the position, 0.7-1m away from the bottom end of the vertical steel plate (1), an upward pulling hole (5) is formed in the top of the vertical steel plate (1), and a sealing strip (2) is arranged in the vertical steel plate (1); the drain valve (3) is formed by overlapping two identical steel sheets with holes, the steel sheets are arranged in advance before the vertical steel plates (1) are inserted into foundation soil, a control handle (4) is welded on the outer steel sheets, and after fine sand (13) is injected and stands, the control handle (4) is rotated to enable the holes of the two steel sheets to coincide for draining; after the water is drained, the control handle (4) is rotated, the water drain hole is blocked by the adjacent steel sheet, and water is not discharged any more; the main body of the drain valve (3) adopts a drill bit with the diameter of 3-5mm to open three equally-spaced oval holes on the steel edge, and the manufactured drain valve (3) is installed in a round hole reserved in the vertical steel plate (1).
2. The construction method of the fine sand soil on-site solidification roadbed according to claim 1, wherein the vertical steel plate (1) is a stainless steel plate with the thickness of 50-100mm, the length is 2-3m, and the height is more than or equal to 3m; the number of the vertical steel plates (1) is four, and the four vertical steel plates (1) are enclosed to form a rectangular cavity.
3. The construction method for solidifying a fine sand soil body in situ according to claim 1, wherein in the step 4), the fine sand (13) and the solidifying agent are stirred by using a stirrer (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210077099.XA CN114508012B (en) | 2022-01-24 | 2022-01-24 | Fine sand soil body on-site solidification roadbed and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210077099.XA CN114508012B (en) | 2022-01-24 | 2022-01-24 | Fine sand soil body on-site solidification roadbed and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114508012A CN114508012A (en) | 2022-05-17 |
| CN114508012B true CN114508012B (en) | 2024-10-22 |
Family
ID=81550624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210077099.XA Active CN114508012B (en) | 2022-01-24 | 2022-01-24 | Fine sand soil body on-site solidification roadbed and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114508012B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202577122U (en) * | 2012-05-10 | 2012-12-05 | 中国十七冶集团有限公司 | Steel formwork support for construction of roads and terraces |
| CN106758559A (en) * | 2017-01-12 | 2017-05-31 | 中铁二院工程集团有限责任公司 | A kind of high-speed railway silt, flour sand embankment structure and construction method |
| CN107724364A (en) * | 2017-09-19 | 2018-02-23 | 无锡市交通工程有限公司 | A kind of construction technology of soft soil foundation |
| CN112942003A (en) * | 2021-02-04 | 2021-06-11 | 河海大学 | Vertical pouring type solidified soil embankment construction mold and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3731201B2 (en) * | 2000-11-02 | 2006-01-05 | 五洋建設株式会社 | Ground improvement method by vacuum consolidation of soft ground with sand layer at intermediate depth. |
| CN103628363B (en) * | 2013-12-06 | 2014-11-26 | 沈阳铁道勘察设计院有限公司 | Construction method for filling and building subgrade by using silty-fine sand as filling materials |
| CN110761137B (en) * | 2019-10-22 | 2021-09-28 | 中铁第四勘察设计院集团有限公司 | Non-damage layered rolling construction method using cement-modified fine silt as roadbed filler |
| CN112942034B (en) * | 2021-01-29 | 2022-04-15 | 中交第四公路工程局有限公司 | Sand silt roadbed filling construction method and application thereof |
-
2022
- 2022-01-24 CN CN202210077099.XA patent/CN114508012B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202577122U (en) * | 2012-05-10 | 2012-12-05 | 中国十七冶集团有限公司 | Steel formwork support for construction of roads and terraces |
| CN106758559A (en) * | 2017-01-12 | 2017-05-31 | 中铁二院工程集团有限责任公司 | A kind of high-speed railway silt, flour sand embankment structure and construction method |
| CN107724364A (en) * | 2017-09-19 | 2018-02-23 | 无锡市交通工程有限公司 | A kind of construction technology of soft soil foundation |
| CN112942003A (en) * | 2021-02-04 | 2021-06-11 | 河海大学 | Vertical pouring type solidified soil embankment construction mold and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114508012A (en) | 2022-05-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106522037B (en) | Side broad way based structures based on existing railway roadbed and its construction method | |
| CN108103871B (en) | Construction method of roadbed foam concrete filling technology adjacent to existing subway facility | |
| CN206902488U (en) | A kind of soft soil foundation high-filled embankment of effectively control settlement after construction | |
| CN104762956B (en) | Method for forming pile based on construction waste recycled aggregate | |
| CN114197261B (en) | Road widening roadbed filling method for immersed road section | |
| CN206346075U (en) | Side broad way based structures based on existing railway roadbed | |
| CN111676987A (en) | Construction method for backfilling construction of construction fertilizer tank by vibrating, slurry-flushing and ramming method | |
| CN113323017B (en) | Construction method of side wall fertilizer groove foam concrete backfill system | |
| CN107916663B (en) | Construction method for soft soil foundation | |
| CN114508012B (en) | Fine sand soil body on-site solidification roadbed and construction method thereof | |
| CN114318990A (en) | Construction waste resource filling method for road widening | |
| CN109137986A (en) | Urban road inspection shaft walling crib green promotes reinforced construction method | |
| CN210529400U (en) | Solidified building residue soil road structure | |
| CN112942003A (en) | Vertical pouring type solidified soil embankment construction mold and method | |
| CN118257285A (en) | Assembled ecological retaining wall construction structure and construction method | |
| CN111719571A (en) | Construction method for foam concrete reinforcement of confined space high-fill roadbed side slope | |
| CN218116337U (en) | Be used for permeating earth and rockfill dam and widen seepage prevention structure | |
| CN218322170U (en) | Road curb filling structure | |
| CN216194634U (en) | Flow state earth bag protective layer and vacuum combined surcharge preloading foundation treatment structure | |
| CN112813858B (en) | Open type corrugated steel culvert structure and construction method thereof | |
| CN103449784B (en) | Be applicable to the cement-based waterproof anticracking material of swelled ground area railway cutting bedding | |
| KR20140114711A (en) | Improvement Method for Base Ground of Pavement Block using Light-Weighted Foam Soil | |
| CN108643132B (en) | Rolled concrete structure with composite slurry injected into stone slag material and construction method thereof | |
| CN114411921A (en) | Method and structure for building roadbed drainage ditch through road reconstruction and extension | |
| CN217997975U (en) | Hydraulic engineering seepage prevention structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |