CN214061091U - Soft foundation treatment structure of bagged steel slag sand well - Google Patents
Soft foundation treatment structure of bagged steel slag sand well Download PDFInfo
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- CN214061091U CN214061091U CN202022506098.1U CN202022506098U CN214061091U CN 214061091 U CN214061091 U CN 214061091U CN 202022506098 U CN202022506098 U CN 202022506098U CN 214061091 U CN214061091 U CN 214061091U
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Abstract
The utility model discloses a structure is handled to soft base of slag sand well in bags, soft base are handled the structure and are included: the steel slag sand cushion layer is laid on the soft soil foundation and sequentially comprises a lower steel slag sand cushion layer, a geogrid and an upper steel slag sand cushion layer from bottom to top; the bagged steel slag sand wells are uniformly distributed on the soft soil foundation, a sand bag is arranged in each bagged steel slag sand well, and the upper end of each sand bag extends upwards to the steel slag sand cushion layer; wherein the sand bag is a permeable sand bag filled with steel slag sand; the roadbed packing layer is laid above the steel slag sand cushion layer; and the overload prepressing packing layer is paved above the roadbed packing layer. Adopt the utility model discloses soft base processing structure can practice thrift the grit resource, improves the utilization ratio of slag sand, improves the structural strength of weak soil foundation, reduces the foundation and subsides.
Description
Technical Field
The utility model relates to a soft base processing technology field, in particular to bagged steel slag sand well soft base processing structure.
Background
The soft soil has the characteristics of high compressibility, low shear strength and the like, and can generate larger total settlement and uneven settlement for the built building, so that the use and safety of an upper structure are influenced. At present, a plurality of soft foundation treatment methods are provided, a bagged sand well is one of the most widely applied soft foundation treatment methods, the materials adopted for soft foundation treatment of the bagged sand well are mainly high-quality sand, however, the high-quality sand can play a good drainage role, but the material price is high, and the sandstone resources in China are in an over-exploitation state, so that the search for new sandstone replacement resources is more and more important, but most of the solid waste resources such as steel slag sand can not be fully utilized at present, and the utilization rate is low.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a steel slag sand well soft base processing structure in bags to overcome the current sand well in bags and adopt the more expensive, excessive exploitation of the price of high-quality sand, and the shortcoming that solid waste steel slag sand utilization ratio is low.
In order to achieve the above object, the utility model provides a soft base processing structure of slag sand well in bags, include: the steel slag sand cushion layer is laid on the soft soil foundation and sequentially comprises a lower steel slag sand cushion layer, a geogrid and an upper steel slag sand cushion layer from bottom to top; the bagged steel slag sand wells are uniformly distributed on the soft soil foundation, a sand bag is arranged in each bagged steel slag sand well, and the upper end of each sand bag extends upwards to the steel slag sand cushion layer; the sand bag is a permeable sand bag, and steel slag sand is filled in the sand bag; the roadbed packing layer is laid above the steel slag sand cushion layer; and the overload prepressing packing layer is paved above the roadbed packing layer.
Preferably, in the technical scheme, the steel slag sand of the steel slag sand cushion layer and the steel slag sand in each sand bag are steel slag fine aggregates with the aging time of more than or equal to 1 year, the particle size of the steel slag fine aggregates is less than or equal to 0.005m, the water immersion expansion rate is less than 0.02, and the fineness modulus is more than 2.7.
Preferably, in the above technical scheme, the pile positions of all the bagged steel slag sand wells are arranged in a plum blossom shape, the distance between two adjacent bagged steel slag sand wells is 1-1.5 m, the diameter of the sand bag is 0.07-0.12 m, the length of the upper end of the sand bag in the steel slag sand cushion layer is more than or equal to 0.3m, and the upper end of the sand bag is not more than the top surface of the lower steel slag sand cushion layer; when the thickness of the soft soil foundation is less than or equal to 20m, the lower end of the bagged steel slag sand well downwards penetrates through the soft soil foundation and penetrates through the hard layer of the base part of the soft soil, and when the thickness of the soft soil foundation is more than 20m, the length of the bagged steel slag sand well is determined according to the design length.
Preferably, in the above technical solution, the sand bag is made of polypropylene woven cloth.
Preferably, in the technical scheme, the tensile strength of the geogrid is more than or equal to 35KN/m, and the elongation is less than or equal to 13%; the overlapping length between two adjacent geogrids in the stressed direction is more than or equal to 0.3m, and the overlapping length in the non-stressed direction is more than or equal to 0.1 m.
Preferably, in the above technical scheme, the thickness of the lower steel slag sand cushion layer and the thickness of the upper steel slag sand cushion layer are both greater than or equal to 0.3m, and the steel slag sand cushion layer extends outwards to the outside of the slope feet at the two sides of the roadbed packing layer.
Preferably, in the above technical solution, the thickness of the overloaded pre-compressed filler layer is greater than 1 m.
Compared with the prior art, the utility model discloses following beneficial effect has:
the sand bag of the soft foundation treatment structure of the utility model is filled with the steel slag sand, the steel slag sand is close to the physical and mechanical properties of the common sand, and under the condition of ensuring a certain gradation, the steel slag sand has good water permeability, and the steel slag sand also has certain activity, and the steel slag sand can be hardened along with the development of time, thereby improving the engaging force of the aggregate; therefore, the steel slag sand is used as a soft soil foundation treatment material instead of high-quality sand, so that the exploitation of sand and stone can be reduced, the sand and stone resource is saved, the natural environment is protected, and the utilization rate of the steel slag sand can be improved to a certain extent; and a steel slag sand cushion layer is paved on the soft soil foundation, and a geogrid is paved in the steel slag sand cushion layer, so that the structural strength of the soft soil foundation can be improved, and the foundation settlement is reduced.
Drawings
Fig. 1 is a schematic structural view of a soft foundation treatment structure of a bagged steel slag sand well according to the utility model.
Fig. 2 is a schematic structural view of the sand bag filled with steel slag sand according to the present invention.
Description of the main reference numerals:
1-bagged steel slag sand well, 11-sand bag, 12-steel slag sand, 2-lower steel slag sand cushion layer, 3-geogrid, 4-upper steel slag sand cushion layer, 5-roadbed packing layer and 6-overload prepressing packing layer.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Fig. 1 and 2 show schematic structural diagrams of a bagged steel slag sand well soft foundation treatment structure according to a preferred embodiment of the present invention, which comprises a steel slag sand cushion layer, a plurality of bagged steel slag sand wells 1, a roadbed packing layer 5 and an overload pre-pressed packing layer 6. Referring to fig. 1 and 2, the steel slag sand cushion is laid on the soft soil foundation, and comprises a lower steel slag sand cushion 2, a geogrid 3 and an upper steel slag sand cushion 4 from bottom to top in sequence; the steel slag sand cushion layer is paved on the soft soil foundation, and the geogrid 3 is paved in the steel slag sand cushion layer, so that the structural strength of the soft soil foundation can be improved, and the foundation settlement is reduced. All the bagged steel slag sand wells 1 are uniformly distributed on the soft soil foundation, a sand bag 11 is arranged in each bagged steel slag sand well 1, and the upper end of each sand bag 11 extends upwards to the steel slag sand cushion layer; wherein the sand bag 11 is a permeable sand bag, and the steel slag sand 12 is filled in the sand bag 11; the roadbed packing layer 5 is laid above the steel slag sand cushion layer; the overload prepressing packing layer 6 is laid above the roadbed packing layer 5. The sand bag 11 adopting the soft foundation treatment structure of the utility model is filled with the steel slag sand 12, the steel slag sand 12 is close to the common sand in physical and mechanical properties, under the condition of ensuring a certain gradation, the steel slag sand 12 has good water permeability, and the steel slag sand 12 also has certain activity, and the steel slag sand 12 can be hardened along with the development of time, thereby improving the occlusion force of aggregate; therefore, the steel slag sand 12 is used as a soft soil foundation treatment material to replace high-quality sand, so that the exploitation of sand and stone can be reduced, the sand and stone resource can be saved, the natural environment can be maintained, and the utilization rate of the steel slag sand can be improved to a certain extent.
Referring to fig. 1 and 2, preferably, the steel slag sand 12 of the steel slag sand cushion layer and the steel slag sand 12 in each sand bag 11 are steel slag fine aggregates with aging time more than or equal to 1 year, the grain size of the steel slag fine aggregates is less than or equal to 0.005m, the water immersion expansion rate is less than 0.02, and the fineness modulus is more than 2.7, namely the steel slag sand is medium coarse sand, the water permeability is good, and the expansion rate is low; so that the bagged steel slag sand well 1 and the steel slag sand cushion layer respectively form a transverse and longitudinal drainage channel of the soft soil foundation, and water in the soft soil foundation is drained to the outside of the foundation through the transverse and longitudinal drainage channels.
Referring to fig. 1, preferably, the pile positions of all bagged steel slag sand wells 1 are arranged in a plum blossom shape, the distance between two adjacent bagged steel slag sand wells 1 is 1-1.5 m, the diameter of a sand bag 11 is 0.07-0.12 m, the length of the upper end of the sand bag 11 in a steel slag sand cushion layer is more than or equal to 0.3m, and the upper end of the sand bag 11 does not exceed the top surface of the lower steel slag sand cushion layer 2, i.e. the upper end of the sand bag 11 does not protrude out of the top surface of the lower steel slag sand cushion layer 2; when the thickness of the soft soil foundation is less than or equal to 20m, the lower end of the bagged steel slag sand well 1 downwards penetrates through the soft soil foundation and penetrates through a hard layer at the base part of the soft soil; when the thickness of the soft soil foundation is larger than 20m, the length of the bagged steel slag sand well 1 is determined according to the design length, wherein the design length of the bagged steel slag sand well 1 is generally 5-30 m.
Referring to fig. 1 and 2, the sand bag 11 is preferably made of woven cloth of polypropylene to improve its water permeability.
Referring to FIG. 1, preferably, the tensile strength of the geogrid 3 is more than or equal to 35KN/m, the elongation is less than or equal to 13%, and the technical indexes of the geogrid 3 are implemented according to traffic engineering geosynthetic geogrid (JT/T480-2002); wherein, the lapping length between two adjacent geogrids 3 in the stressed direction is more than or equal to 0.3m, and the lapping length in the non-stressed direction is more than or equal to 0.1 m.
Referring to FIG. 1, preferably, the thickness of the lower steel slag sand cushion layer 2 and the thickness of the upper steel slag sand cushion layer 4 are both more than or equal to 0.3m, so as to improve the strength of the steel slag sand cushion layer; wherein, the steel slag sand cushion layer extends outwards to the outside of the slope feet at the two sides of the roadbed packing layer 5, and the length of the steel slag sand cushion layer extending out of the slope feet of the roadbed packing layer 5 is preferably 1 m.
Referring to fig. 1, the thickness of the overloaded pre-loaded packing layer 6 is preferably > 1 m.
Referring to fig. 1 and 2, a construction method of a bagged steel slag sand well soft foundation treatment structure includes the following steps:
(1) surface treatment: the method comprises the steps of cleaning the ground surface of the roadbed, namely cleaning sundries such as garbage, corrosive soil, planting soil on the ground surface and the like in the range of the roadbed, filling and compacting pits on the ground surface of the roadbed, excavating drainage ditches on two sides of the roadbed, and removing surface water in the range of the roadbed.
(2) Paving a lower steel slag sand cushion layer 2: and paving a lower steel slag sand cushion layer 2 on the roadbed, and leveling the lower steel slag sand cushion layer 2.
(3) Pile position arrangement: marking the pile position of each bagged steel slag sand well 1 on the soft soil foundation of the roadbed after the paved lower steel slag sand cushion layer 2 is checked and accepted; wherein, all pile positions are arranged in a plum blossom shape, and the distance between two adjacent bagged steel slag sand wells 1 is 1-1.5 m.
(4) The pile driver is in place: the pile driver is moved to one of the pile positions, so that the three lines of the pile tower, the pile pipe and the pile position are integrated, the position deviation between the bottom of the pile pipe and the plane of the pile position is within plus or minus 0.15m, and the verticality deviation of the pile pipe is less than or equal to 1.5 percent.
(5) Pile pipe sinking: the method comprises the following steps of driving a pile pipe into a soft soil foundation by using a vibration hammer, wherein the pipe sinking speed of the pile pipe is 1.5-2 m/min, scales are arranged outside the pile pipe, and the depth of the pipe sinking is determined by the scales of the pile pipe.
(6) Manufacturing and sinking the sand bag 11: after the pile pipe is installed in place, filling steel slag sand 12 into the sand bag 11 in a sand filling machine sand filling and man-made tool sand assisting mode, filling the steel slag sand 12 into the sand bag 11 under the action of vibration force under the sand filling machine, then filling and compacting the man-made tool sand, so that the sand filling rate in the sand bag 11 is more than or equal to 95%, and binding and compacting the opening of the sand bag 11 by using a plastic tape after the sand filling is finished to seal the opening of the sand bag 11; the inner wall of the pile pipe is wetted, the sand bag 11 filled with the steel slag sand 12 is placed in the pile pipe, and the opening of the sand bag 11 is arranged upwards when the sand bag 11 is installed.
(7) Pulling out the pile tube: after the sand bag 11 is installed in place, the pile pipe is pulled out at the speed of 1-1.5 m/min, and water is injected into the pile pipe in the process of pulling out the pile pipe, so that the pile pipe can be smoothly pulled out from the hole.
(8) Pile machine shift, sand bag 11 bag head are buried underground: and (3) after the pile pipe is pulled out, moving the pile machine into the next pile position, straightening the bag head of the sand bag 11 placed in the step (6), namely straightening the upper end of the sand bag, piling the sand bag by using steel slag sand 12, and enabling the length of the upper end of the sand bag 11 extending into the steel slag sand cushion layer to be more than or equal to 0.3m and the upper end of the sand bag 11 not to protrude out of the top surface of the lower steel slag sand cushion layer 2.
(9) Constructing all bagged steel slag sand wells 1: repeating the steps (4) to (8) until all the bagged steel slag sand wells 1 are completely constructed,
(10) paving a geogrid 3: after all the bagged steel slag sand wells 1 are completely constructed, a geogrid 3 is paved on the upper steel slag sand cushion layer 4; the overlapping length between adjacent geogrids in the stressed direction is larger than or equal to 0.3m, the overlapping length in the non-stressed direction is larger than or equal to 0.1m, the overlapping parts of the geogrids 3 are connected in an inserting mode through No. 8 iron wires every 1m along the transverse direction of a roadbed, namely the width direction of the roadbed, and the geogrids 3 are fixed on the lower steel slag sand cushion layer 2 through U-shaped nails every 1.5-2 m.
(11) Paving an upper steel slag sand cushion layer 4: after the geogrid 3 is paved, an upper steel slag sand cushion layer 4 is paved on the geogrid 3; the steel slag sand 12 can be transported to the edge of the roadbed by a dump truck, then the steel slag sand 12 is primarily leveled by a bulldozer according to the designed elevation, the leveling is carried out by assisting the manual cooperation with a grader, and the compaction degree is more than or equal to 90 percent by adopting the static pressure of a 20T road roller.
(12) Paving a roadbed packing layer 5 and an overload prepressing packing layer 6: after the upper steel slag sand cushion layer 4 is paved, a roadbed packing layer 5 and an overload prepressing packing layer 6 are sequentially paved on the upper steel slag sand cushion layer 4. The construction of the roadbed packing layer 5 is implemented according to technical Specification for highway roadbed construction (JTG/T3610-2019), graded filling and rolling are carried out, the load capacity of each grade corresponds to the strength growth of the foundation, the loading speed is strictly controlled in the loading process, so that the settlement of the center of the roadbed every day and night is less than or equal to 0.015m, the lateral displacement of a slope toe every day and night is less than or equal to 0.008m, when the foundation is found to have an abnormal expression exceeding the loading control standard, measures are taken in time, such as suspension loading or unloading, and the loading is resumed after the foundation is normal; the thickness of the overload prepressing packing layer 6 is more than 1m, and the prepressing period is more than or equal to 8.5 months. And after the pre-pressing is finished, unloading the pre-pressed filler layer 6, wherein the settlement per month of the center of the roadbed is less than or equal to 0.005m during unloading.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. The utility model provides a structure is handled to steel slag sand well soft base in bags which characterized in that includes:
the steel slag sand cushion layer is laid on the soft soil foundation and sequentially comprises a lower steel slag sand cushion layer, a geogrid and an upper steel slag sand cushion layer from bottom to top;
the bagged steel slag sand wells are uniformly distributed on the soft soil foundation, a sand bag is arranged in each bagged steel slag sand well, and the upper end of each sand bag extends upwards to the steel slag sand cushion layer; the sand bag is a permeable sand bag, and steel slag sand is filled in the sand bag;
the roadbed packing layer is laid above the steel slag sand cushion layer; and
and the overload pre-pressing packing layer is laid above the roadbed packing layer.
2. The bagged steel slag sand well soft foundation treatment structure as claimed in claim 1, wherein the steel slag sand of the steel slag sand cushion layer and the steel slag sand in each sand bag are steel slag fine aggregates with aging time of more than or equal to 1 year, the particle size of the steel slag fine aggregates is less than or equal to 0.005m, the water-soaking expansion rate is less than 0.02, and the fineness modulus is more than 2.7.
3. The bagged steel slag sand well soft foundation treatment structure as claimed in claim 1, wherein the pile positions of all the bagged steel slag sand wells are arranged in a plum blossom shape, the distance between two adjacent bagged steel slag sand wells is 1-1.5 m, the diameter of the sand bag is 0.07-0.12 m, the length of the upper end of the sand bag in the steel slag sand cushion layer is more than or equal to 0.3m, and the upper end of the sand bag is not more than the top surface of the lower steel slag sand cushion layer; when the thickness of the soft soil foundation is less than or equal to 20m, the lower end of the bagged steel slag sand well downwards penetrates through the soft soil foundation and penetrates through the hard layer of the base part of the soft soil, and when the thickness of the soft soil foundation is more than 20m, the length of the bagged steel slag sand well is determined according to the design length.
4. The bagged steel slag sand well soft foundation treatment structure as claimed in claim 1, wherein the sand bag is made of polypropylene woven cloth.
5. The bagged steel slag sand well soft foundation treatment structure as claimed in claim 1, wherein the tensile strength of the geogrid is more than or equal to 35KN/m, and the elongation is less than or equal to 13%; the overlapping length between two adjacent geogrids in the stressed direction is more than or equal to 0.3m, and the overlapping length in the non-stressed direction is more than or equal to 0.1 m.
6. The bagged steel slag sand well soft foundation treatment structure as claimed in claim 1, wherein the thickness of the lower steel slag sand cushion layer and the thickness of the upper steel slag sand cushion layer are both more than or equal to 0.3m, and the steel slag sand cushion layers extend outwards beyond the slope feet at the two sides of the roadbed packing layer.
7. The soft foundation treatment structure of the bagged steel slag sand well as defined in claim 1, wherein the thickness of the overload pre-pressed packing layer is more than 1 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022506098.1U CN214061091U (en) | 2020-11-03 | 2020-11-03 | Soft foundation treatment structure of bagged steel slag sand well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022506098.1U CN214061091U (en) | 2020-11-03 | 2020-11-03 | Soft foundation treatment structure of bagged steel slag sand well |
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| CN214061091U true CN214061091U (en) | 2021-08-27 |
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| CN202022506098.1U Active CN214061091U (en) | 2020-11-03 | 2020-11-03 | Soft foundation treatment structure of bagged steel slag sand well |
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| CN (1) | CN214061091U (en) |
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