CN108425357B - Construction process of soft soil foundation - Google Patents
Construction process of soft soil foundation Download PDFInfo
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- CN108425357B CN108425357B CN201710079944.6A CN201710079944A CN108425357B CN 108425357 B CN108425357 B CN 108425357B CN 201710079944 A CN201710079944 A CN 201710079944A CN 108425357 B CN108425357 B CN 108425357B
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
-
- 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
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
Abstract
The invention discloses a construction process of a soft soil foundation, which has the technical scheme key points that the construction process comprises the following steps: (1) defining a construction range, excavating a roadbed groove on the soft foundation and paving a sandstone layer; (2) laying a hollow rubber ring on the sandstone layer, and plugging water-absorbing filler in the hollow rubber ring; (3) a sponge heat-insulating layer is wound on the hollow rubber ring, and a steel wire is bound on the sponge heat-insulating layer; (4) inserting a steel bar upright post in the middle of the hollow rubber ring; (5) a cavity for introducing thermoplastic adhesive is arranged in the connecting rod, and the thermoplastic adhesive enters the cavity and flows out through the inner wall of the connecting hole; (6) lay the immersed tube on hollow rubber ring, lay rubble mortar layer and lay the portland cement layer on rubble mortar layer on the immersed tube, the construction technology of this application has good environmental protection performance, has guaranteed to have excellent heavy load resistance and structural strength on this soft soil foundation simultaneously.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction process of a soft soil foundation.
Background
The improvement is open, along with the continuous improvement of national productivity, the economy of China is rapidly developed, the increase of civil engineering is continuous, the construction scale of urban roads is enlarged, the difficulty of road construction is continuously improved due to the fact that urban roads are newly built and reconstructed and the underground structure of the cities is complex, and particularly the difficulty of road construction is increased for the construction of soft soil foundations.
The soft soil is natural fine soil deposited in valley, coastal, river beach and lake and has the characteristics of low shear strength, low permeability coefficient, high water content, long settling stabilization time, high compression coefficient and large pore ratio, and if the soft soil foundation is not treated or the treatment method is improper, the quality of the road can be reduced, and the use of the road can be seriously influenced.
At present, chinese patent with application publication No. CN105625301A in the existing patent discloses a soft foundation treatment construction process, which comprises sinking a sinking pipe below the ground of a soft foundation, and performing construction by adopting a vibration sinking pipe mode, so as to enhance the ground strength of the soft foundation.
However, the immersed tube is buried underground for a long time, and when the immersed tube is exposed to extremely cold or hot weather, the immersed tube can be cracked after being subjected to cold and hot alternation, and the service life of the immersed tube is obviously shortened.
Disclosure of Invention
The invention aims to provide a construction process of a soft soil foundation, which is beneficial to prolonging the service life of a immersed tube.
The technical purpose of the invention is realized by the following technical scheme:
a construction process of a soft soil foundation comprises the following steps:
(1) defining a construction range, excavating a roadbed groove on the soft foundation, and paving a sand stone layer in the roadbed groove;
(2) laying a hollow rubber ring on the gravel layer, plugging a water-absorbing filler in the hollow rubber ring, wherein the density of the water-absorbing filler in the hollow rubber ring is 25-30 kg/m3；
(3) A sponge heat-insulating layer is wound on the hollow rubber ring, and a steel wire is bound on the sponge heat-insulating layer;
(4) inserting a steel bar stand column in the middle of the hollow rubber ring, inserting one end of the steel bar stand column into the sandstone layer, protruding the other end of the steel bar stand column out of the upper surface of the hollow rubber ring, sleeving a connecting rod on the steel bar stand column, and sleeving two ends of the connecting rod on the adjacent steel bar stand columns respectively;
(5) connecting holes are formed in the two ends of the connecting rod, a cavity for introducing a thermoplastic adhesive is formed in the connecting rod, and the thermoplastic adhesive enters the cavity and flows out through the inner wall of the connecting hole;
(6) laying a sinking pipe on the hollow rubber ring, laying a gravel mortar layer on the sinking pipe and laying a silicate cement layer on the gravel mortar layer.
By adopting the technical scheme, the sandstone layer is laid on the soft soil foundation, the hollow rubber ring is laid on the sandstone layer, the sponge heat-insulating layer is wound on the hollow rubber ring, the thermoplastic adhesive flows to the connecting hole from the cavity and flows on the hollow rubber ring, the steel bar stand column and the hollow rubber ring are firmly bonded, and the immersed tube is laid above the hollow rubber ring to generate a good heat-insulating effect on the immersed tube, so that the service life of the immersed tube is prolonged; meanwhile, a gravel mortar layer and a silicate cement layer are laid above the immersed tube, so that excellent heavy load resistance and structural strength of the soft soil foundation are guaranteed.
The invention is further configured to: the water absorption filler comprises, by weight, 20-30 parts of cotton fibers, 20-30 parts of bamboo charcoal fibers, 10-20 parts of montmorillonite, 5-10 parts of citric acid, 5-10 parts of polyacrylamide and 10-20 parts of diatom ooze.
By adopting the technical scheme, the cotton fiber, the bamboo charcoal fiber, the montmorillonite, the diatom ooze and the polyacrylamide are blended, and the citric acid in a liquid state is dripped, so that the water-absorbing filler with good structural integrity is prepared, the water-absorbing filler is filled in the hollow rubber ring, when the environment in the air is wet, the water-absorbing filler plays a water-absorbing role, the hollow rubber ring is ensured to have a dry surrounding environment, and the service life of the hollow rubber ring is prolonged.
The invention is further configured to: the hollow rubber ring is formed by curing chloroprene rubber, ethylene propylene diene monomer rubber or styrene butadiene rubber.
By adopting the technical scheme, the chloroprene rubber has good mechanical properties, oil resistance, heat resistance, flame resistance, sunlight resistance, ozone resistance, acid and alkali resistance, higher tensile strength, elongation at break, reversible crystallinity and good adhesion; the ethylene propylene diene monomer is a copolymer of ethylene, propylene and a small amount of non-conjugated diene, and has excellent heat resistance, weather resistance and erosion resistance; the performance of the styrene butadiene rubber is similar to that of natural rubber, the styrene butadiene rubber has excellent wear resistance, heat resistance and aging resistance, can be used together with various synthetic rubbers, and has wide application, and the hollow rubber ring prepared from any one of the rubbers has excellent compression resistance and wear resistance and can resist extreme cold and extreme hot weather changes.
The invention is further configured to: the thermoplastic adhesive comprises, by weight, 20-30 parts of PE powder, 70-80 parts of acrylate copolymer, 5-10 parts of polysiloxane, 1-3 parts of dicumyl peroxide, 5-10 parts of acetone, 10-20 parts of fumed silica and 3-5 parts of stannous chloride.
The invention is further configured to: the preparation method of the acrylate copolymer comprises the following steps of adding hydroxyethyl methacrylate, maleic anhydride, octylphenol polyoxyethylene ether, sodium dodecyl sulfate, water and potassium persulfate into an emulsifier, starting stirring for emulsification, heating to 70-80 ℃, reacting for 3-4 hours, cooling to room temperature, and adjusting the pH value to be neutral.
By adopting the technical scheme, the thermoplastic adhesive prepared by the formula has excellent thermoplasticity, can be quickly melted into fluid after being heated, is quickly injected into the cavity, can keep longer-time fluidity, is not easy to solidify, flows onto the inner wall of the connecting hole, is beneficial to improving the bonding capacity of the connecting rod and the hollow rubber ring, and has good heat insulation and cooling performance on the immersed tube above the connecting rod.
The invention is further configured to: the gravel mortar layer is prepared by crushing gravel to be less than 10mm by adopting a crusher, and mixing 40-45 wt% of mortar into the crushed gravel.
Through adopting above-mentioned technical scheme, the particle diameter of injecing the rubble is below 10mm, helps playing effectual filling to blend rubble and mortar, make the circumference of rubble adhere to a large amount of mortar, the rubble has great viscidity, and fill in immersed tube top, help strengthening the associativity of immersed tube and rubble mortar layer, thereby improve the structural integrity and the heavy load resistance of the structure of mating formation on the soft base of this application.
The invention is further configured to: the mortar is prepared by mixing bentonite, clay, wollastonite powder, cement and polyurethane adhesive.
By adopting the technical scheme, the mortar prepared by the formula has smaller particle size, can be more uniformly dispersed in gaps of the broken stones, has good viscosity, and is favorable for ensuring the viscosity around the broken stones, thereby enhancing the associativity with the immersed tube and improving the structural integrity on the soft soil foundation.
The invention is further configured to: the silicate cement layer comprises, by weight, 60-70 parts of ordinary silicate cement, 10-20 parts of fly ash, 5-10 parts of sepiolite, 10-20 parts of natural zeolite, 10-20 parts of clay, 5-10 parts of carbon powder, 1-5 parts of tri-n-propoxide, 5-10 parts of sodium bisulfate and 40-80 parts of water.
By adopting the technical scheme, the portland cement layer is prepared from the components in parts by weight, the natural zeolite and the sodium bisulfate generate a compounding effect, the structural strength of the common portland cement is favorably enhanced, and meanwhile, the clay, the carbon powder, the vitrified micro bubbles, the fly ash and the like have different grain diameters and are favorably filled in mutual gaps, so that the compressive strength of the portland cement is obviously improved.
In conclusion, the invention has the following beneficial effects:
the construction process comprises the steps of firstly, excavating a roadbed groove on a soft foundation, paving a sandstone layer into the roadbed groove, fixing a hollow rubber ring on the sandstone layer, and plugging a water-absorbing filler in the hollow rubber ring, so that the hollow rubber ring can be kept in a dry surrounding environment; the thermoplastic adhesive can be used for firmly bonding the steel bar stand column and the hollow rubber ring, so that the structural integrity of the hollow rubber ring and the steel bar stand column is improved; the immersed tube is placed on the hollow rubber ring, and the broken stone mortar layer and the silicate cement layer are laid on the immersed tube, so that the paving structure with excellent heat resistance and weather resistance on the soft soil foundation is prepared, and the service life of the immersed tube in the paving structure is prolonged.
Detailed Description
The present invention will be described in further detail with reference to examples.
The conversion of the parts by weight used in the application to the common mass units: 1 part by weight is 10 g.
The first embodiment is as follows:
the preparation method of the (mono) acrylate copolymer comprises the following steps:
adding 30 parts of hydroxyethyl methacrylate, 40 parts of maleic anhydride, 15 parts of water, 1 part of sodium dodecyl sulfate, 1 part of octylphenol polyoxyethylene ether and 1 part of potassium persulfate into an emulsifier, starting stirring for emulsification at the stirring speed of 75r/min, then heating to 70 ℃, reacting for 3 hours, cooling, adjusting the pH value to 7, and drying in a high-temperature drying oven at the temperature of 200 ℃ for 2 hours to obtain the acrylic copolymer with high viscosity.
(II) a preparation method of the thermoplastic adhesive comprises the following steps:
putting 20 parts of PE powder on an open mill, adjusting the temperature to 120 ℃, and heating for 30 min; evenly dividing 70 parts of acrylate copolymer for 3 times, placing the mixture on an open mill, pouring 4 parts of stannous chloride, and mixing for 60 min; and continuously pouring 15 parts of fumed silica, 8 parts of polysiloxane, 2 parts of dicumyl peroxide and 6 parts of acetone, and mixing for 30min to obtain the thermoplastic adhesive.
(III) the preparation method of the water-absorbing filler comprises the following steps:
20 parts of cotton fiber, 30 parts of bamboo charcoal fiber, 15 parts of montmorillonite, 8 parts of citric acid, 16 parts of diatom ooze and 6 parts of polyacrylamide are put into a high-speed blender to be fully stirred for 30 min.
(IV) a preparation method of the gravel mortar layer comprises the following steps:
crushing the broken stone by using a crusher, keeping the average particle size of the broken stone below 10mm, doping mortar into the crushed broken stone, wherein the mortar is prepared by mixing bentonite, clay, silica fume, cement and polyurethane adhesive in equal weight ratio, and the weight ratio of the broken stone to the mortar is limited to 3: and 2, fully mixing the broken stones and the mortar in a stirrer to help the surfaces of the broken stones to adhere to a large amount of mortar, and uniformly paving the stirred mixture above the immersed tube.
And (V) a preparation method of the silicate cement layer:
putting 65 parts of ordinary portland cement, 13 parts of fly ash, 15 parts of sepiolite, 13 parts of natural zeolite, 12 parts of clay, 6 parts of carbon powder, 3 parts of triethanolamine, 5 parts of sodium bisulfate and 40 parts of water into a mixer for blending and stirring for 1 hour; the stirred mixture was then uniformly coated on top of the crushed stone mortar layer.
The construction process of the soft foundation comprises the following steps:
(1) defining a construction range, excavating 1m by 1m roadbed grooves on the soft foundation, and paving a large number of sandstone layers in the roadbed grooves, wherein the paving thickness is 0.4 m;
(2) laying hollow rubber rings with the diameter of 0.3m on the gravel layer, wherein the hollow rubber rings are made of chloroprene rubber through curing and are in a tire shape, laying the hollow rubber rings in the roadbed groove at equal intervals, and tightly plugging water-absorbing fillers into the hollow rubber rings;
(3) the sponge heat-insulating layer is tightly wound on the hollow rubber ring and tightly bound on the sponge heat-insulating layer by using steel wires so as to fix the sponge heat-insulating layer on the hollow rubber ring;
(4) a cylindrical steel bar stand column is inserted in the middle of the hollow rubber ring, one end of the steel bar stand column is inserted into the sandstone layer, and the other end of the steel bar stand column protrudes out of the upper surface of the hollow rubber ring;
(5) connecting adjacent steel bar stand columns by using a connecting rod, wherein connecting holes are formed in two ends of the connecting rod, a cavity is formed in the connecting rod, a thermoplastic adhesive is injected into the cavity and flows out of the inner wall direction of the connecting holes, and the thermoplastic adhesive flows on the hollow rubber ring, so that the steel bar stand columns are favorably and tightly bonded on the hollow rubber ring;
(6) laying a sinking pipe on the hollow rubber ring, laying a gravel mortar layer above the sinking pipe to completely cover the hollow rubber ring, and uniformly laying a silicate cement layer on the gravel mortar layer.
Example two:
the preparation method of the (mono) acrylate copolymer comprises the following steps:
adding 35 parts of hydroxyethyl methacrylate, 35 parts of maleic anhydride, 15 parts of water, 1 part of sodium dodecyl sulfate, 1 part of octylphenol polyoxyethylene ether and 1 part of potassium persulfate into an emulsifier, starting stirring for emulsification at the stirring speed of 75r/min, heating to 70 ℃, reacting for 3 hours, cooling, adjusting the pH value to 7, and drying in a high-temperature drying oven at the temperature of 200 ℃ for 2 hours to obtain the acrylic copolymer with high viscosity.
(II) a preparation method of the thermoplastic adhesive comprises the following steps:
putting 20 parts of PE powder on an open mill, adjusting the temperature to 120 ℃, and heating for 30 min; evenly dividing 70 parts of acrylate copolymer for 3 times, placing the mixture on an open mill, pouring 3 parts of stannous chloride, and mixing for 60 min; and continuously pouring 18 parts of fumed silica, 6 parts of polysiloxane, 1 part of dicumyl peroxide and 7 parts of acetone, and mixing for 30min to obtain the thermoplastic adhesive.
(III) the preparation method of the water-absorbing filler comprises the following steps:
putting 25 parts of cotton fiber, 25 parts of bamboo charcoal fiber, 15 parts of montmorillonite, 10 parts of citric acid, 12 parts of diatom ooze and 8 parts of polyacrylamide into a high-speed blender, fully stirring and stirring for 30 min.
(IV) a preparation method of the gravel mortar layer comprises the following steps:
crushing the broken stones by using a crusher, keeping the average particle size of the broken stones below 10mm, doping mortar into the crushed broken stones, wherein the mortar is prepared by mixing bentonite, clay, silica fume, cement and polyurethane adhesive in the same weight ratio, and the weight ratio of the broken stones to the mortar is limited to 3: and 2, fully mixing the broken stones and the mortar in a stirrer to help the surfaces of the broken stones to adhere to a large amount of mortar, and uniformly paving the stirred mixture above the immersed tube.
And (V) a preparation method of the silicate cement layer:
putting 62 parts of ordinary portland cement, 13 parts of fly ash, 15 parts of sepiolite, 10 parts of natural zeolite, 15 parts of clay, 8 parts of carbon powder, 2 parts of triethanolamine, 6 parts of sodium bisulfate and 45 parts of water into a mixer for blending and stirring for 1 hour; the stirred mixture was then uniformly coated on top of the crushed stone mortar layer.
The construction process of the soft foundation comprises the following steps:
(1) defining a construction range, excavating 1m by 1m roadbed grooves on the soft foundation, and paving a large number of sandstone layers in the roadbed grooves, wherein the paving thickness is 0.4 m;
(2) laying hollow rubber rings with the diameter of 0.3m on the gravel layer, wherein the hollow rubber rings are made of chloroprene rubber through curing and are in a tire shape, laying the hollow rubber rings in the roadbed groove at equal intervals, and tightly plugging water-absorbing fillers into the hollow rubber rings;
(3) the sponge heat-insulating layer is tightly wound on the hollow rubber ring and tightly bound on the sponge heat-insulating layer by using steel wires so as to fix the sponge heat-insulating layer on the hollow rubber ring;
(4) a cylindrical steel bar stand column is inserted in the middle of the hollow rubber ring, one end of the steel bar stand column is inserted into the sandstone layer, and the other end of the steel bar stand column protrudes out of the upper surface of the hollow rubber ring;
(5) connecting adjacent steel bar stand columns by using a connecting rod, wherein connecting holes are formed in two ends of the connecting rod, a cavity is formed in the connecting rod, a thermoplastic adhesive is injected into the cavity and flows out of the inner wall direction of the connecting holes, and the thermoplastic adhesive flows on the hollow rubber ring, so that the steel bar stand columns are favorably and tightly bonded on the hollow rubber ring;
(6) laying a sinking pipe on the hollow rubber ring, laying a gravel mortar layer above the sinking pipe to completely cover the hollow rubber ring, and uniformly laying a silicate cement layer on the gravel mortar layer.
Example three:
the preparation method of the (mono) acrylate copolymer comprises the following steps:
adding 40 parts of hydroxyethyl methacrylate, 30 parts of maleic anhydride, 12 parts of water, 2 parts of sodium dodecyl sulfate, 2 parts of octylphenol polyoxyethylene ether and 2 parts of potassium persulfate into an emulsifier, starting stirring for emulsification at the stirring speed of 75r/min, then heating to 70 ℃, reacting for 3 hours, cooling, adjusting the pH value to 7, and drying in a high-temperature drying oven at the temperature of 200 ℃ for 2 hours to obtain the acrylic copolymer with high viscosity.
(II) a preparation method of the thermoplastic adhesive comprises the following steps:
placing 25 parts of PE powder on an open mill, adjusting the temperature to 120 ℃, and heating for 30 min; evenly dividing 70 parts of acrylate copolymer for 3 times, placing the mixture on an open mill, pouring 3 parts of stannous chloride, and mixing for 60 min; and continuously pouring 15 parts of fumed silica, 5 parts of polysiloxane, 1 part of dicumyl peroxide and 5 parts of acetone, and mixing for 30min to obtain the thermoplastic adhesive.
(III) the preparation method of the water-absorbing filler comprises the following steps:
30 parts of cotton fiber, 20 parts of bamboo charcoal fiber, 12 parts of montmorillonite, 6 parts of citric acid, 12 parts of diatom ooze and 8 parts of polyacrylamide are put into a high-speed blender to be fully stirred for 30 min.
(IV) a preparation method of the gravel mortar layer comprises the following steps:
crushing the broken stone by using a crusher, keeping the average particle size of the broken stone below 10mm, doping mortar into the crushed broken stone, wherein the mortar is prepared by mixing bentonite, clay, silica fume, cement and polyurethane adhesive in equal weight ratio, and the weight ratio of the broken stone to the mortar is limited to 3: and 2, fully mixing the broken stones and the mortar in a stirrer to help the surfaces of the broken stones to adhere to a large amount of mortar, and uniformly paving the stirred mixture above the immersed tube.
And (V) a preparation method of the silicate cement layer:
putting 65 parts of ordinary portland cement, 13 parts of fly ash, 12 parts of sepiolite, 13 parts of natural zeolite, 13 parts of clay, 5 parts of carbon powder, 4 parts of triethanol amine, 10 parts of sodium bisulfate and 50 parts of water into a mixer for blending and stirring for 1 hour; the stirred mixture was then uniformly coated on top of the crushed stone mortar layer.
The construction process of the soft foundation comprises the following steps:
(1) defining a construction range, excavating 1m by 1m roadbed grooves on the soft foundation, and paving a large number of sandstone layers in the roadbed grooves, wherein the paving thickness is 0.4 m;
(2) laying hollow rubber rings with the diameter of 0.3m on the gravel layer, wherein the hollow rubber rings are made of chloroprene rubber through curing and are in a tire shape, laying the hollow rubber rings in the roadbed groove at equal intervals, and tightly plugging water-absorbing fillers into the hollow rubber rings;
(3) the sponge heat-insulating layer is tightly wound on the hollow rubber ring and tightly bound on the sponge heat-insulating layer by using steel wires so as to fix the sponge heat-insulating layer on the hollow rubber ring;
(4) a cylindrical steel bar stand column is inserted in the middle of the hollow rubber ring, one end of the steel bar stand column is inserted into the sandstone layer, and the other end of the steel bar stand column protrudes out of the upper surface of the hollow rubber ring;
(5) connecting adjacent steel bar stand columns by using a connecting rod, wherein connecting holes are formed in two ends of the connecting rod, a cavity is formed in the connecting rod, a thermoplastic adhesive is injected into the cavity and flows out of the inner wall direction of the connecting holes, and the thermoplastic adhesive flows on the hollow rubber ring, so that the steel bar stand columns are favorably and tightly bonded on the hollow rubber ring;
(6) laying a sinking pipe on the hollow rubber ring, laying a gravel mortar layer above the sinking pipe to completely cover the hollow rubber ring, and uniformly laying a silicate cement layer on the gravel mortar layer.
Comparative example:
(1) defining a construction range, and excavating a roadbed trench on the soft foundation;
(2) erecting immersed pipes in the roadbed groove, wherein the immersed pipes are oppositely arranged and tightly inserted into the roadbed groove;
(3) and spreading a large amount of gravels and a pitch surface layer into the roadbed trench, wherein the pitch surface layer is formed by uniformly spreading pitch.
The detection means is as follows:
splitting tensile strength: the test is carried out on a 3000KN microcomputer control electro-hydraulic servo pressure testing machine in a university of great managerial work, and the specific steps are that before the test, the position to be split is drawn in the middle of a test piece; then, placing the test piece at the center of a lower pressure plate of the testing machine, and filling an arc-shaped base plate and a wood three-ply board cushion layer between the upper pressure plate and the lower pressure plate and the test piece, wherein the wood cushion layer is 0.5m wide, 0.01m thick and more than 0.5m long; starting the testing machine, manually controlling to enable the upper pressing plate to be close to the test piece, and adjusting the ball seat to enable the contact to be balanced; starting the tester to automatically control, the loading speed is 0.05MPa/s, and storing the test result until the component is damaged.
The test results of the test pieces for tensile strength at cleavage are shown in the following table:
as can be known from the table above, the average splitting strength that the test piece of this embodiment can reach is more than 5.5MPa, is greater than the splitting strength of prior art far away, and the road of the construction technology mating formation according to this application on soft base has excellent anti splitting strength, helps prolonging the life of road.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. A construction process of a soft soil foundation is characterized by comprising the following steps:
(1) defining a construction range, excavating a roadbed groove on the soft foundation, and paving a sand stone layer in the roadbed groove;
(2) laying a hollow rubber ring on the gravel layer, plugging a water-absorbing filler in the hollow rubber ring, wherein the density of the water-absorbing filler in the hollow rubber ring is 25-30 kg/m3；
(3) A sponge heat-insulating layer is wound on the hollow rubber ring, and a steel wire is bound on the sponge heat-insulating layer;
(4) inserting a steel bar stand column in the middle of the hollow rubber ring, inserting one end of the steel bar stand column into the sandstone layer, protruding the other end of the steel bar stand column out of the upper surface of the hollow rubber ring, sleeving a connecting rod on the steel bar stand column, and sleeving two ends of the connecting rod on the adjacent steel bar stand columns respectively;
(5) connecting holes are formed in the two ends of the connecting rod, a cavity for introducing a thermoplastic adhesive is formed in the connecting rod, and the thermoplastic adhesive enters the cavity and flows out through the inner wall of the connecting hole;
(6) laying a sinking pipe on the hollow rubber ring, laying a gravel mortar layer on the sinking pipe and laying a silicate cement layer on the gravel mortar layer.
2. The construction process of a soft soil foundation according to claim 1, characterized in that the water-absorbing filler comprises the following components in parts by weight: 20-30 parts of cotton fibers, 20-30 parts of bamboo charcoal fibers, 10-20 parts of montmorillonite, 5-10 parts of citric acid, 5-10 parts of polyacrylamide and 10-20 parts of diatom ooze.
3. A soft soil foundation construction process according to claim 1, characterised in that: the hollow rubber ring is formed by curing chloroprene rubber, ethylene propylene diene monomer rubber or styrene butadiene rubber.
4. A soft soil foundation construction process according to claim 1, characterised in that the thermoplastic adhesive comprises the following components in parts by weight: 20-30 parts of PE powder, 70-80 parts of acrylate copolymer, 5-10 parts of polysiloxane, 1-3 parts of dicumyl peroxide, 5-10 parts of acetone, 10-20 parts of fumed silica and 3-5 parts of stannous chloride.
5. A soft soil foundation construction process as claimed in claim 4, characterised in that the preparation method of the acrylate copolymer is as follows: adding hydroxyethyl methacrylate, maleic anhydride, octylphenol polyoxyethylene ether, sodium dodecyl sulfate, water and potassium persulfate into an emulsifier, starting stirring for emulsification, then heating to 70-80 ℃, reacting for 3-4 h, cooling to room temperature, and adjusting the pH value to be neutral.
6. The soft soil foundation construction process of claim 1, wherein the gravel mortar layer is prepared by crushing the gravel to below 10mm by a crusher and mixing 40-45 wt% mortar into the crushed gravel.
7. A soft soil foundation construction process according to claim 6, characterised in that: the mortar is prepared by mixing bentonite, clay, wollastonite powder, cement and polyurethane adhesive.
8. A soft soil foundation construction process as claimed in claim 1, characterised in that the portland cement layer comprises the following components in parts by weight: 60-70 parts of ordinary portland cement, 10-20 parts of fly ash, 5-10 parts of sepiolite, 10-20 parts of natural zeolite, 10-20 parts of clay, 5-10 parts of carbon powder, 1-5 parts of triethanolamine, 5-10 parts of sodium bisulfate and 40-80 parts of water.
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| CN201710079944.6A CN108425357B (en) | 2017-02-14 | 2017-02-14 | Construction process of soft soil foundation |
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| CN201710079944.6A CN108425357B (en) | 2017-02-14 | 2017-02-14 | Construction process of soft soil foundation |
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| CN105951872B (en) * | 2016-05-27 | 2018-01-09 | 无锡市政设计研究院有限公司 | Drainage pipeline basis and its construction method in a kind of soft soil foundation |
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