CN103306266B - A kind of underground density saline soil post for over-salted soil or strong salinized soil and construction method thereof - Google Patents
A kind of underground density saline soil post for over-salted soil or strong salinized soil and construction method thereof Download PDFInfo
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- CN103306266B CN103306266B CN201310218229.8A CN201310218229A CN103306266B CN 103306266 B CN103306266 B CN 103306266B CN 201310218229 A CN201310218229 A CN 201310218229A CN 103306266 B CN103306266 B CN 103306266B
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Abstract
The invention discloses a kind of underground density saline soil post for super (by force) salinized soil and construction method thereof, belong to field of civil engineering.Shaft 1/2 is descended above Ground for groundwater table, salt content is at 5-44%, there is super (by force) brining ground foundation of specific ion composition and content, stir the mixture of appropriate lime, clinker, active mineral admixture, gypsum and salinized soil formation saline soil, and the water content controlling salinized soil makes saline soil be near optimum moisture content; There is one lower end the sleeve pipe of temporary plugging to implant brining ground foundation to projected depth, saline soil progressively to be inserted in sleeve pipe and to make its density be near maximum dry density to its dry density, finally form a underground density saline soil post.This underground density saline soil post can solve the problem of the existing method for processing foundation bearing capacity of super (by force) saline soil area ground and durability deficiency.
Description
Technical field
The present invention relates to a kind of underground density saline soil post for super (by force) salinized soil and construction method thereof, belong to field of civil engineering.
Background technology
Region, China salt lake area accounts for the half of area, mainly concentrates on Salt Lake in Xinjiang district, Tibetan Salt Lakes district, Qinghai Salt Lake district and Yanhu District, the Inner Mongol.Salinized soil region salt content around salt lake can up to 44%, salinized soil produces serious chemical attack, physical crystal corrosion to the concrete prepared with silicate series cement, cause steel bar concrete corrosion, the durability of concrete and reinforced concrete structure is constituted a serious threat.According to the investigation of Chinese Research Institute for Building Sciences to Ge-ermu, its research conclusion eliminates pile foundation and the measures of foundation treatment of all silicate series cements and steel.Therefore be badly in need of exploitation high-bearing capacity and the good foundation reinforcement method of durability are provided in super (by force) salinized soil.
The invention provides a kind of underground density saline soil post for super (by force) salinized soil and construction method thereof.
Summary of the invention
Through repetition test, inventor finds that leading ion composition and content are Ca for salt content 5 ~ 44%
2+: 0.27 ~ 4.82%, Mg
2+: 0.17 ~ 1.99%, K
+and Na
+: 1.40 ~ 14.50%, SO
4 2-: 0.76 ~ 11.40%, Cl
-: 0.74 ~ 21.97%, HCO
3 -: 0.01 ~ 0.1%, CO
3 2-: super (by force) salinized soil of 0.002 ~ 0.02%, the mixture of appropriate lime, clinker, active mineral admixture, gypsum and the salinized soil of natural moisture content is used to stir formation saline soil, because some salt in salinized soil participates in reaction, define the cementing hydrated product being different from cement and producing, make the intensity of saline soil reach 8 ~ 11MPa, but this still can not meet making high-bearing capacity artificial foundation to the requirement of saline soil high strength.If further research finds to make the water content of salinized soil be reduced near optimum moisture content, the mixture of the lime of same volume, clinker, active mineral admixture, gypsum and salinized soil mix evenly after compacting or tamp near maximum dry density, saline soil intensity will significantly improve.But for the occasion that groundwater table is higher, the water content of salinized soil, all far above optimum moisture content, therefore needs to find the construction method obtaining saline soil maximum dry density.Notice that western high salinity saline soil area rainfall is few, air oxygen detrition, the duration of sunshine is long, therefore can adopt measure air-dry for salinized soil.
Based on above-mentioned situation, inventor proposes a kind of underground density saline soil post for super (by force) salinized soil and construction method thereof.Specific as follows: that descend shaft 1/2 above Ground for specific ion composition and content and groundwater table surpasses (by force) salinized soil place, stir the mixture of appropriate lime, clinker, active mineral admixture, gypsum and salinized soil formation saline soil, control the water content of salinized soil, make saline soil be near optimum moisture content; There is a lower end sleeve pipe of temporary plugging implantation brining ground foundation to target depth and ensure in pipe dry; The saline soil be near optimum moisture content prepared is inserted in sleeve pipe, adopts certain mode to make the saline soil density inserting sleeve pipe be near maximum dry density to its dry density; Along with progressively inserting and density of saline soil, progressively by sleeve lift, and its lower end is closed by saline soil all the time, final formation one underground density saline soil post.Effect in salinized soil in some salinity and saline soil between other components, makes underground density saline soil post have higher intensity in this context, and has good salt erosion durability.Described lime, clinker, active mineral admixture, gypsum are that specific area is greater than 250m
2the powder of/kg.
Super (by force) salinized soil of the present invention, its salt content is 5 ~ 44%, and leading ion composition and content are Ca
2+: 0.27 ~ 4.82%, Mg
2+: 0.17 ~ 1.99%, K
+and Na
+: 1.40 ~ 14.50%, SO
4 2-: 0.76 ~ 11.40%, Cl
-: 0.74 ~ 21.97%, HCO
3 -: 0.01 ~ 0.1%, CO
3 2-: 0.002 ~ 0.02%.
The percentage range that each dry component weight of saline soil of the present invention accounts for saline soil dry weight is:
1) materials A, this component accounts for 1.2 ~ 13.4% of saline soil dry weight;
2) active mineral admixture, this component accounts for 1.4 ~ 15.9% of saline soil dry weight;
3) gypsum, this component accounts for 0 ~ 0.5% of saline soil dry weight;
4) salinized soil, this dry component weight accounts for 83.3 ~ 95.3% of saline soil dry weight.
Wherein, materials A is the mixture of lime and clinker, and the percentage range that lime, clinker dry weight account for materials A dry weight is respectively lime 0 ~ 100%, clinker 0 ~ 100%; Active mineral admixture refers to the natural or artificial material containing activated silica, aluminium component, comprises the one or more combination being not limited in the material such as pozzolana mixed material, slag.Pozzolana mixed material comprises materials such as being not limited to pozzolan, float stone, kieselguhr, burnedc lay, coal gangue clinker.
Lower end of the present invention is made up of sleeve pipe, pile top and water barrier the sleeve pipe of temporary plugging.Wherein, sleeve pipe is sleeve pipe general in pile foundation engineering, can be circular or square as required; Pile top can be but be not limited to ordinary Portland cement concrete, alkali-excited cement concrete etc. well known materials is prefabricated form; Water barrier is placed between sleeve pipe and pile top, can by but be not limited to the cheap engineering material such as the rubber pad discarded and prepare, or use on-the-spot earth shutoff, play impermeable role.Sleeve pipe, pile top and water barrier can make by known technology.
The certain mode of employing of the present invention makes the saline soil density inserting sleeve pipe, and its mode adopted can be but be not limited to 3 kinds below: 1. adopt the weight of constant weight and floor space the saline soil inserting sleeve pipe to be tamped; 2. static pressure equipment is adopted to insert the saline soil densification of sleeve pipe; 3. backpitch press-fit equipment is adopted to insert the saline soil densification of sleeve pipe.
One of the present invention is used for underground density saline soil post and the construction method thereof of super (by force) salinized soil, it is characterized by: according to the needs of design to cylinder bearing capacity, by controlling tamping energy, the pressure of static pressure equipment, the pressure of backpitch press-fit equipment of weight, the difform density saline soil post of the density saline soil post equal with casing diameter, enlarged can be formed.
Near optimum moisture content of the present invention, near maximum dry density, refer to the water content ω of saline soil, dry density ρ and compaction test gained optimum moisture content ω in basis " Standard for test methods of earthworks " (GBT50123-1999)
0, maximum dry density ρ
0between meet following relation: | ω
0-ω |≤10%; 0.6 ρ
0≤ ρ≤ρ
0.
The site test results of Binding experiment room experimental data and underground density saline soil post provided by the invention, The present invention gives underground density saline soil post and is suitable for salinized soil optimum salinity scope and saline soil each component optimal proportion scope.
The optimum salinity that this underground density saline soil post is suitable for super chlorine saline soil and super sub-chlorine saline soil is 9 ~ 40%, and the optimum salinity being suitable for ultra-sulphate stain soil and super sulfurous acid salinized soil is 7 ~ 20%; The optimal proportion scope of each component of corresponding saline soil (with dry weight) is:
1) slag, this component accounts for 3.81 ~ 15.84% of saline soil dry weight;
2) lime, this component accounts for 0.24 ~ 3.34% of saline soil dry weight;
3) salinized soil, this component accounts for 83.33 ~ 95.23% of saline soil dry weight
With reference to " Standard for test methods of earthworks " (GBT50123-1999), test as follows.The salinized soil mix getting appropriate lime, clinker, active mineral admixture, gypsum and natural moisture content evenly forms saline soil, and the preparation length of side is the test cube of 50mm; Controlling salinized soil water content makes above-mentioned saline soil be in optimum moisture content, and the preparation length of side is the closely knit test cube (dry density of test block is maximum dry density) of 50mm; Above-mentioned lime, clinker, active mineral admixture, gypsum are replaced with equivalent portland cement and evenly form saline soil with salinized soil mix, controlling salinized soil water content makes saline soil be in optimum moisture content, and the preparation length of side is the closely knit test cube (dry density of test block is maximum dry density) of 50mm.After the test block demoulding, carry out clear water maintenance, salinized soil maintenance (same with salinized soil environment facies of the present invention) respectively, carry out unconfined compression strength test the different length of time, result of the test is as shown in table 1.
The compressive strength of table 1 different cementing salinized soil test block under different larval instar, different care environments
Illustrate: wherein A is the closely knit test cube intensity of optimum moisture content; B is the test cube intensity of natural moisture content; C is equivalent portland cement volume and is in the closely knit test cube intensity of optimum moisture content.
From table 1, experimental data is known: the effect in some salinity in salinized soil and saline soil between other components and the density of saline soil obtain high density saline soil, make saline soil have higher intensity at salinized soil environment; Saline soil has good durability in salinized soil environment; Be mixed with the saline soil of equivalent portland cement in salinized soil environment corrosion-vulnerable.
One of the present invention is used for underground density saline soil post and the construction method thereof of super (by force) salinized soil, and concrete construction technology is:
The first step: carry out engineering exploration, understands the salt content of salinized soil, ionic species and physical property index.
Second step: according to the saline soil intensity of saline soil post designing requirement, and the salt content of salinized soil, ionic species and physical property index, determine composition and the volume of saline soil.
3rd step: lime, clinker, active mineral admixture, gypsum fully mixed and evenly form saline soil with salinized soil mix, by salinized soil is air-dry etc., mode controls salinized soil water content makes saline soil be near optimum moisture content.
4th step: adopt the modes such as static pressure, hammering or vibration to be had one lower end the sleeve pipe of temporary plugging to implant brining ground foundation to target depth; due to the protective effect of the water barrier between pile top and sleeve pipe, sleeve pipe is in dry state all the time in pipe in implantation brining ground foundation process.
5th step: saline soil progressively to be inserted in sleeve pipe and to adopt certain mode to make saline soil density, form underground density saline soil post, wherein make the mode of saline soil density can be but be not limited in 3 kinds of modes below: 1. to adopt the weight of constant weight and floor space to insert the saline soil compacting of sleeve pipe: to insert in sleeve pipe by the saline soil layering prepared, often insert the heavy tamping that namely one deck saline soil uses constant weight and floor space, make the saline soil dry density of compacting be near maximum dry density; Along with successively inserting and compacting of saline soil, progressively by sleeve lift, and its lower end is closed by saline soil all the time, final formation one underground density saline soil post.2. static pressure equipment is adopted to insert the saline soil densification of sleeve pipe: to insert in sleeve pipe by the saline soil layering prepared, often insert one deck saline soil and namely use static pressure equipment densification, make the saline soil dry density of densification be near maximum dry density; Along with successively inserting and densification of saline soil, progressively by sleeve lift, and its lower end is closed by saline soil all the time, final formation one underground density saline soil post.3. backpitch press-fit equipment is adopted to insert the saline soil densification of sleeve pipe: the drilling rod with elongated helical blade to be put into sleeve bottom, inserts in sleeve pipe by the saline soil prepared by the reversion of helical blade; Making saline soil be delivered to casing shoe densification by helical blade by backpitch pressure people equipment to drilling rod applying certain pressure is near maximum dry density to its dry density; Along with progressively inserting and densification of saline soil, progressively promote sleeve pipe and make drilling rod progressively increase, and its lower end is closed by saline soil all the time, final formation one underground density saline soil post.
One of the present invention is used for underground density saline soil post and the construction method thereof of super (by force) salinized soil, and its advantage is:
1, described underground density saline soil post has good durability in super (by force) salinized soil.
2, due to other components in some salinity in salinized soil and saline soil and between effect and the high density saline soil that obtains of saline soil density, described underground density saline soil post has higher intensity in salinized soil environment.
3, described underground density saline soil post effectively make use of Resource of Saline Soil, and construction method is simple, greatly reduces the engineering cost of basement process.
4, the composition material environmentally safe of described underground density saline soil post, meets long-term sustainable development strategy.
Accompanying drawing explanation
Fig. 1 is the sleeve pipe schematic diagram that there is temporary plugging a lower end;
Fig. 2 inserts saline soil schematic diagram in sleeve pipe for the first time;
Fig. 3-a is heavy tamping saline soil schematic diagram;
Fig. 3-b is static pressure equipment densification saline soil schematic diagram;
Fig. 3-c is backpitch pressure people equipment densification saline soil schematic diagram;
Fig. 4 is the saline soil schematic diagram of compacting (densification);
Fig. 5-a is the saline soil cylinder schematic diagram equal with casing diameter of certain construction stage compacting (densification);
Fig. 5-b is the density saline soil cylinder schematic diagram equal with casing diameter of having constructed;
Fig. 6-a is the saline soil cylinder schematic diagram of the expansion diameter of certain construction stage compacting (densification);
Fig. 6-b is the density saline soil cylinder schematic diagram of the expansion diameter of having constructed;
Fig. 7-a is the saline soil cylinder schematic diagram of the expansion diameter of certain construction stage compacting (densification);
Fig. 7-b is the density saline soil cylinder schematic diagram of the expansion diameter of having constructed;
Fig. 8 is the density saline soil cylinder schematic diagram of the expansion diameter of having constructed.
Detailed description of the invention
The making and the construction method that below in conjunction with drawings and Examples, one of the present invention are used for the underground density saline soil post of super (by force) salinized soil are described in further details, but the type of service of underground density saline soil post provided by the invention and the scope of application are not limited in this.
Embodiment 1
Certain saline soil area employing underground density saline soil post consolidated subsoil.Know that the salt content of salinized soil is 15% according to engineering investigation report, groundwater table is positioned at underground 3.5m, and leading ion composition and content are Ca
2+: 0.81%, Mg
2+: 0.51%, K
+and Na
+: 4.23%, SO
4 2-: 2.28%, Cl
-: 6.66%, HCO
3 -: 0.03%, CO
3 2-: 0.006%, salinized soil water content is 25.7%.
Adopt one of the present invention for surpassing underground density saline soil post and the construction method thereof of (by force) salinized soil.Design column length 8.5m, column section 35cm × 35cm, saline soil requirement of strength is 7.0Mpa; The composed as follows of saline soil is calculated: clinker 7.7 parts, pozzolan 3.08 parts, 2.8 parts, slag, 0.42 part, gypsum, salinized soil 86 parts by dry weight part; By salinized soil airing, saline soil is made to be near optimum moisture content; Do on-the-spot compaction test, relevant parameter when compaction in layers to its dry density is 65% of maximum dry density in selected sleeve pipe by above-mentioned saline soil: insert saline soil 15kg for every layer, weight 13.5kg, every layer of ramming times 4 times.
Adopt square casing, ordinary Portland cement precast concrete pile point also with discarded rubber pad as water barrier, forms the sleeve pipe that there is temporary plugging lower end.By the mode of static pressure, there is the sleeve pipe press-in brining ground foundation of temporary plugging lower end to projected depth, press previous process flow process by above-mentioned parameter and construct, the Cheng Zhutu that each staged construction is correlated with as shown in Figure 1, Figure 2, shown in Fig. 3-a, Fig. 4, Fig. 5-a, Fig. 5-b.Through pile quality detection, the underground density saline soil post intensity of 28 days is 8.1MPa.
Embodiment 2
Certain saline soil area employing underground density saline soil post consolidated subsoil.Know that the salt content of salinized soil is 9.6% according to engineering investigation report, groundwater table is positioned at underground 2.5m, and leading ion composition and content are Ca
2+: 0.51%, Mg
2+: 0.19%, K
+and Na
+: 2.80%, SO
4 2-: 1.41%, Cl
-: 4.55%, HCO
3 -: 0.01%, CO
3 2-: 0.003%, salinized soil water content is 20.5%.
Adopt one of the present invention for surpassing underground density saline soil post and the construction method thereof of (by force) salinized soil.Design column length 9.0m, column section 40cm × 40cm, saline soil requirement of strength is 7.4Mpa; The composed as follows of saline soil is calculated: clinker 7.2 parts, pozzolan 2.56 parts, float stone 2 parts, 0.24 part, gypsum, salinized soil 88 parts by dry weight part; Salinized soil is air-dry, make saline soil be near optimum moisture content; Do on-the-spot compaction test, relevant parameter when compaction in layers to its dry density is maximum dry density 80% in selected sleeve pipe by above-mentioned saline soil: insert saline soil 20kg for every layer, weight 25.0kg, every layer of ramming times 5 times.
Adopt circular casing, alkali-excited cement precast concrete pile point, and with on-the-spot earth as water barrier, form the sleeve pipe that there is temporary plugging lower end.By the mode of static pressure, there is the sleeve pipe press-in brining ground foundation of temporary plugging lower end to projected depth, press previous process flow process by above-mentioned parameter and construct, the Cheng Zhutu that each staged construction is correlated with as shown in Figure 1, Figure 2, shown in Fig. 3-a, Fig. 4, Fig. 6-a, Fig. 6-b.Through pile quality detection, the underground density saline soil post intensity of 28 days is 8.4MPa.
Embodiment 3
Certain saline soil area employing underground density saline soil post consolidated subsoil.Know that the salt content of salinized soil is 7.6% according to engineering investigation report, groundwater table is positioned at underground 3.0m, and leading ion composition and content are Ca
2+: 0.42%, Mg
2+: 0.27%, K
+and Na
+: 1.70%, SO
4 2-: 4.42%, Cl
-: 0.74%, HCO
3 -: 0.02%, CO
3 2-: 0.004%, salinized soil water content is 28.4%.
Adopt one of the present invention for surpassing underground density saline soil post and the construction method thereof of (by force) salinized soil.Design column length 10.0m, post footpath 40cm, saline soil requirement of strength is 7.7Mpa; The composed as follows of saline soil is calculated: 1.4 parts, lime, 5.6 parts, slag, salinized soil 93 parts by dry weight part; Airing is carried out to salinized soil, makes saline soil be near optimum moisture content; Do on-the-spot consolidation test, relevant parameter when layering densification to its dry density is 72% of maximum dry density in selected sleeve pipe by above-mentioned saline soil: insert saline soil 20kg for every layer, static pressure equipment provides pressure to be 0-40KN, 1 minute static pressure time.
Adopt circular casing, Portland cement precast concrete pile point, and with on-the-spot earth as water barrier, form the sleeve pipe that there is temporary plugging lower end.Have the sleeve pipe of temporary plugging to implant brining ground foundation to projected depth lower end by the mode of hammering, press previous process flow process by above-mentioned parameter and construct, the Cheng Zhutu that each staged construction is correlated with as shown in Figure 1, Figure 2, shown in Fig. 3-b, Fig. 4, Fig. 5-a, Fig. 5-b.Through pile quality detection, the underground density saline soil post intensity of 28 days is 8.8MPa.
Embodiment 4
Certain saline soil area employing underground density saline soil post consolidated subsoil.Know that the salt content of salinized soil is 20.8% according to engineering investigation report, groundwater table is positioned at underground 2.0m, and leading ion composition and content are Ca
2+: 0.80%, Mg
2+: 0.36%, K
+and Na
+: 6.60%, SO
4 2-: 2.12%, Cl
-: 10.64%, HCO
3 -: 0.04%, CO
3 2-: 0.004%, salinized soil water content is 16.5%.
Adopt one of the present invention for surpassing underground density saline soil post and the construction method thereof of (by force) salinized soil.Design column length 11.0m, column section 45cm × 45cm, saline soil requirement of strength is 7.2Mpa; The composed as follows of saline soil is calculated: clinker 6 parts, 8.55 parts, slag, 0.45 part, gypsum, salinized soil 85 parts by dry weight part; Saline soil is near optimum moisture content; Do on-the-spot consolidation test, relevant parameter when layering densification to its dry density is maximum dry density 60% in selected sleeve pipe by above-mentioned saline soil: insert saline soil 20kg for every layer, the pressure that backpitch press-fit equipment provides is 0-40KN, and rotating speed is 40 revs/min, continues 1 minute.
Adopt circular casing, alkali-excited cement precast concrete pile point, and with on-the-spot earth as water barrier, form the sleeve pipe that there is temporary plugging lower end.Lower end had the sleeve pipe press-in brining ground foundation of temporary plugging to projected depth by vibrator vibratory impulse, press previous process flow process by above-mentioned parameter and construct, the Cheng Zhutu that each staged construction is correlated with as shown in Figure 1, Figure 2, shown in Fig. 3-c, Fig. 4, Fig. 5-a, Fig. 5-b.Through pile quality detection, the underground density saline soil post intensity of 28 days is 8.0MPa.
Embodiment 5
Certain saline soil area employing underground density saline soil post consolidated subsoil.Know that the salt content of salinized soil is 24.2% according to engineering investigation report, groundwater table is positioned at underground 4.0m, and leading ion composition and content are Ca
2+: 0.54%, Mg
2+: 0.52%, K
+and Na
+: 7.88%, SO
4 2-: 2.68%, Cl
-: 12.12%, HCO
3 -: 0.02%, CO
3 2-: 0.008%, salinized soil water content is 32.5%.
Adopt one of the present invention for surpassing underground density saline soil post and the construction method thereof of (by force) salinized soil.Design column length 12.0m, post footpath 45cm, saline soil requirement of strength is 10.2MPa; The composed as follows of saline soil is calculated: clinker 2.97 parts, 6.82 parts, slag, float stone 0.88 part, 0.33 part, gypsum, salinized soil 89 parts by dry weight part; Airing is carried out to salinized soil, makes saline soil be near optimum moisture content; Do on-the-spot consolidation test, by above-mentioned saline soil layering densification to its dry density in selected sleeve pipe be maximum dry density connect 84% time relevant parameter: insert saline soil 25kg for every layer, static pressure equipment provides pressure to be 0-70KN, 1 minute static pressure time.
Adopt square casing, Portland cement precast concrete pile point, and make water barrier by geotextiles, form the sleeve pipe that there is temporary plugging lower end.By the mode of static pressure, there is the sleeve pipe press-in brining ground foundation of temporary plugging lower end to projected depth, press previous process flow process by above-mentioned parameter and construct, the Cheng Zhutu that each staged construction is correlated with as shown in Figure 1, Figure 2, Fig. 3-b, shown in Fig. 4, Fig. 8.Through pile quality detection, the underground density saline soil post intensity of 28 days is 11.4MPa.
Embodiment 6
Certain saline soil area employing underground density saline soil post consolidated subsoil.Know that the salt content of salinized soil is according to engineering investigation report: 18.6%, groundwater table is positioned at underground 2.5m, and leading ion composition and content are Ca
2+: 0.72%, Mg
2+: 1.31%, K
+and Na
+: 4.28%, SO
4 2-: 10.24%, Cl
-: 2.02%, HCO
3 -: 0.012%, CO
3 2-: 0.002%, salinized soil water content is 12.5%.
Adopt one of the present invention for surpassing underground density saline soil post and the construction method thereof of (by force) salinized soil.Design column length 15.0m, cross section 40cm × 40cm, saline soil requirement of strength is 12.8MPa; The composed as follows of saline soil is calculated: 8.9 parts, slag, 1.1 parts, lime, salinized soil 90 parts by dry weight part; Saline soil water content is near optimum moisture content; Do on-the-spot compaction test, relevant parameter when compaction in layers to its dry density is 80% of maximum dry density in selected sleeve pipe by above-mentioned saline soil: insert saline soil 25kg for every layer, weight 30kg, every layer of ramming times 7 times.
By hammer mode, sleeve pipe is implanted brining ground foundation to projected depth, press previous process flow process by above-mentioned parameter and construct.To be had lower end the sleeve pipe of temporary plugging implant brining ground foundation to projected depth by vibrator vibratory impulse, press previous process flow process by above-mentioned parameter and construct, the Cheng Zhutu that each staged construction is correlated with as shown in Figure 1, Figure 2, shown in Fig. 3-a, Fig. 4, Fig. 6-a, Fig. 6-b.Through pile quality detection, the underground density saline soil post intensity of 28 days is 14.0MPa.
Embodiment 7
Certain saline soil area employing underground density saline soil post consolidated subsoil.Know that the salt content of salinized soil is according to engineering investigation report: 44%, groundwater table is positioned at underground 1.5m, and leading ion composition and content are Ca
2+: 1.38%, Mg
2+: 1.88%, K
+and Na
+: 14.44%, SO
4 2-: 4.2%, Cl
-: 21.97%, HCO
3 -: 0.05%, CO
3 2-: 0.01%, salinized soil water content is 35.5%
Adopt one of the present invention for surpassing underground density saline soil post and the construction method thereof of (by force) salinized soil.Design column length 14.0m, post footpath 45cm, the requirement of strength of saline soil is 9.2Mpa; The composed as follows of saline soil is calculated: clinker 4 parts, 6.4 parts, slag, 0.8 part, lime, calcining coal gangue 1.28 parts, burnedc lay 1.6 parts, 0.8 part, kieselguhr, 0.32 part, gypsum, float stone 0.8 part, salinized soil 84 parts by dry weight part; Salinized soil is air-dry, make saline soil be near optimum moisture content; Do on-the-spot compaction test, above-mentioned saline soil is progressively inserted sleeve pipe and use backpitch press-fit equipment to make its density to its dry density be maximum dry density 85% time relevant parameter: saline soil inserts speed 40kg/ minute, backpitch press-fit equipment provides pressure to be 0-80KN, rotating speed 50 revs/min, 1 minute action time.
Adopt circular casing, alkali-excited cement precast concrete pile point, and with on-the-spot earth as water barrier, form the sleeve pipe that there is temporary plugging lower end.To be had lower end the sleeve pipe of temporary plugging implant brining ground foundation to projected depth by hammer mode, press previous process flow process by above-mentioned parameter and construct, the Cheng Zhutu that each staged construction is correlated with as shown in Figure 1, Figure 2, shown in Fig. 3-c, Fig. 4, Fig. 7-a, Fig. 7-b.Through pile quality detection, the underground density saline soil post intensity of 28 days is 10.1MPa.
Claims (6)
1., for a underground density saline soil post for over-salted soil or strong salinized soil, it is characterized in that: descend shaft 1/2 above Ground for groundwater table, salt content is 5 ~ 44%, and leading ion composition and content are Ca
2+: 0.27 ~ 4.82%, Mg
2+: 0.17 ~ 1.99%, K
+and Na
+: 1.40 ~ 14.50%, SO
4 2-: 0.76 ~ 11.40%, Cl
-: 0.74 ~ 21.97%, HCO
3 -: 0.01 ~ 0.1%, CO
3 2-: the super or strong salinized soil place of 0.002 ~ 0.02%, by appropriate lime, clinker, active mineral admixture, the mixture of gypsum and salinized soil stir formation saline soil, the water content controlling salinized soil makes saline soil be near optimum moisture content, the sleeve pipe of temporary plugging is had one lower end to implant in brining ground foundation to target depth and ensure in pipe dry, saline soil is inserted sleeve pipe, certain mode is adopted to make the saline soil density inserting sleeve pipe be near maximum dry density to its dry density, along with progressively inserting and density of saline soil, sleeve pipe is progressively promoted, and its lower end is closed by saline soil all the time, final formation one underground density saline soil post, the percentage range that each dry component weight of described saline soil accounts for saline soil dry weight is: materials A 1.2 ~ 13.4%, active mineral admixture 1.4 ~ 15.9%, gypsum 0 ~ 0.5%, salinized soil 83.3 ~ 95.3%, wherein materials A is the mixture of lime and clinker, and the percentage range that lime, clinker dry weight account for materials A dry weight is respectively lime 0 ~ 100%, clinker 0 ~ 100%, described lime, clinker, active mineral admixture, gypsum are that specific area is greater than 250m
2the powder of/kg, near described optimum moisture content, near maximum dry density, refer to water content ω, the dry density ρ of saline soil and compaction test gained optimum moisture content ω in basis " Standard for test methods of earthworks (GBT50123-1999) "
0, maximum dry density ρ
0between meet following relation: | ω
0-ω |≤10%, 0.6 ρ
0≤ ρ≤ρ
0.
2. a kind of underground density saline soil post for over-salted soil or strong salinized soil according to claim 1, it is characterized in that: described active mineral admixture refers to the natural or artificial material containing activated silica, aluminium component, comprise the one or more combination of pozzolana mixed material, slag material, wherein pozzolana mixed material comprises pozzolan, float stone, kieselguhr, burnedc lay, coal gangue clinker material.
3. a kind of underground density saline soil post for over-salted soil or strong salinized soil according to claim 1, it is characterized in that: described is made up of sleeve pipe, water barrier and pile top the sleeve pipe of temporary plugging, wherein, sleeve pipe is sleeve pipe general in pile foundation engineering, for circular or square; Pile top is by ordinary Portland cement concrete or alkali-excited cement concrete is prefabricated forms; Water barrier is placed between sleeve pipe and pile top, is prepared by the engineering material of cheapness, or uses on-the-spot earth shutoff, plays impermeable role.
4. a kind of underground density saline soil post for over-salted soil or strong salinized soil according to claim 1, it is characterized in that: the certain mode of described employing makes to insert the saline soil density of sleeve pipe, and its mode comprises 3 kinds below: 1. adopt the weight of constant weight and floor space will insert the saline soil compacting of sleeve pipe; 2. static pressure equipment is adopted to insert the saline soil densification of sleeve pipe; 3. backpitch press-fit equipment is adopted to insert the saline soil densification of sleeve pipe.
5. a kind of underground density saline soil post for over-salted soil or strong salinized soil according to claim 1, it is characterized in that: described underground density saline soil post, according to the needs of design to cylinder bearing capacity, by controlling tamping energy, the pressure of static pressure equipment, the pressure of backpitch press-fit equipment of weight, the difform density saline soil post of the density saline soil post equal with casing diameter, enlarged can be formed.
6. the construction method of a kind of underground density saline soil post for over-salted soil or strong salinized soil according to claim 1, it is characterized in that, Specific construction technique is:
The first step: carry out engineering exploration, understands the salt content of salinized soil, ionic species and physical property index;
Second step: according to the saline soil intensity of saline soil post designing requirement, and the salt content of salinized soil, ionic species and physical property index, determine saline soil composition and volume;
3rd step: by lime, clinker, active mineral admixture, gypsum and salinized soil in proportion mix evenly form saline soil; Controlling salinized soil water content makes saline soil be near optimum moisture content;
4th step: had a lower end sleeve pipe of temporary plugging to implant brining ground foundation to target depth, due to the protective effect of water barrier, sleeve pipe is in dry state all the time in pipe in implantation process;
5th step: saline soil is progressively inserted in sleeve pipe, mode described in claim 4 is adopted to make saline soil density, form underground density saline soil post, 3 kinds make the mode of saline soil density be specially: 1. adopt the weight of constant weight and floor space to insert the saline soil compacting of sleeve pipe: to insert in sleeve pipe by the saline soil layering prepared, often insert the heavy tamping that namely one deck saline soil uses constant weight and floor space, make the saline soil dry density of compacting be near maximum dry density; Along with successively inserting and compacting of saline soil, progressively by sleeve lift, and its lower end is closed by saline soil all the time, final formation one underground density saline soil post; 2. static pressure equipment is adopted to insert the saline soil densification of sleeve pipe: to insert in sleeve pipe by the saline soil layering prepared, often insert one deck saline soil and namely use static pressure equipment densification, make the saline soil dry density of densification be near maximum dry density; Along with successively inserting and densification of saline soil, progressively by sleeve lift, and its lower end is closed by saline soil all the time, final formation one underground density saline soil post; 3. backpitch press-fit equipment is adopted to insert the saline soil densification of sleeve pipe: the drilling rod with elongated helical blade is put into sleeve bottom, the saline soil prepared is inserted in sleeve pipe by the reversion of helical blade, makes saline soil be delivered to casing shoe densification by helical blade by backpitch equipment to drilling rod applying certain pressure simultaneously and be near maximum dry density to its dry density; Along with progressively inserting and densification of saline soil, progressively promote sleeve pipe and make drilling rod progressively increase, and its lower end is closed by saline soil all the time, final formation one underground density saline soil post.
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