CN112553991A - Weak expansive soil old roadbed reinforcing method and widening method - Google Patents
Weak expansive soil old roadbed reinforcing method and widening method Download PDFInfo
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- CN112553991A CN112553991A CN202011372425.7A CN202011372425A CN112553991A CN 112553991 A CN112553991 A CN 112553991A CN 202011372425 A CN202011372425 A CN 202011372425A CN 112553991 A CN112553991 A CN 112553991A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Road Paving Structures (AREA)
Abstract
The application discloses a method for reinforcing an old roadbed of weak expansive soil and a widening method, wherein the method for reinforcing the old roadbed of the weak expansive soil comprises the following steps: breaking the road surface of the old road and leveling the position of the road bed; determining the pile position of each pile on the road bed and marking, wherein the pile positions are arranged in an equilateral triangle, and the distance between every two adjacent pile positions is twice of the influence radius of each slurry spraying pile; and carrying out slurry spraying pile construction on the pile position to form a composite foundation. The construction difficulty is big among the construction process of strengthening the old roadbed of weak expansive soil among the correlation technique, and the job site turns over to mix the ginseng ash raise dust great, unsatisfied environmental protection requirement's problem.
Description
Technical Field
The application relates to the field of road construction, in particular to a method for reinforcing an old roadbed of weak expansive soil and a widening method.
Background
With the continuous development of domestic transportation roads, various diseases are continuously generated in roadbed construction technology for decades ago and influence on the safe use of roads, wherein old roadbed with weak expansive soil is a typical case, so that the old roadbed needs to be reinforced, and the current situation that the thickness of the second layer of weak expansive clay on the top of the embankment of the original roadbed is larger is that the social influence is larger if full-section excavation and dust doping improvement are adopted, the construction cost of complete clearing and refilling is high, the period is long, the social influence is poor, the implementation difficulty is larger, the dust raising caused by stirring and doping dust on a construction site is larger, and the environmental protection requirement of the construction site is not met.
Aiming at the problems that in the related art, the construction difficulty is high in the construction process of reinforcing the old roadbed of the weak expansive soil, the stirring of the ginseng ash and the dust at the construction site are high, and the environmental protection requirement is not met, an effective solution is not provided at present.
Disclosure of Invention
The application mainly aims to provide a method for reinforcing an old weak expansive soil roadbed and a widening method, so as to solve the problems that in the related technology, the construction difficulty is high in the construction process of reinforcing the old weak expansive soil roadbed, the stirring and dust mixing of a construction site is high, and the environment-friendly requirement is not met.
In order to achieve the above object, the present application provides a method for reinforcing an old road foundation with weak expansive soil, which includes the following steps:
breaking the road surface of the old road and leveling the position of the road bed;
determining the pile position of each pile on the road bed and marking, wherein the pile positions are arranged in an equilateral triangle, and the distance between every two adjacent pile positions is twice of the influence radius of each slurry spraying pile;
and carrying out slurry spraying pile construction on the pile position to form a composite foundation.
Further, the method comprises the steps of paving a geogrid on the composite foundation, backfilling a road bed on the geogrid, and constructing a pavement structure layer on the backfilled road bed.
Further, the backfilling road bed is a 6% lime soil backfilling road bed with the height of 0.8m, and the height of the pavement structure layer is 0.6 m.
Furthermore, the diameter of the slurry spraying pile is 0.4-1m, and the distance between adjacent pile positions is 1.5-4 m.
Furthermore, the diameter of the slurry spraying pile is 0.5m, and the distance between adjacent pile positions is 2 m.
Further, the length of the guniting pile is 7-10 m.
Further, the construction of the slurry spraying pile comprises the following steps:
the drilling machine is installed and debugged and connected with a slurry conveying pipeline, and the drilling machine is moved to a pile position, so that a drill bit is aligned to the center of the pile position;
cement paste is prepared according to the requirement of the set mixing proportion, and the cement paste is poured into a paste pool which is communicated with a paste conveying pipeline;
and starting a drilling machine to drill and spray the pile position until a slurry spraying pile is formed.
According to another aspect of the present application, there is provided a method for widening an old road bed with weak expansive soil, including the steps of:
breaking the road surface of the old road and leveling the position of the road bed;
determining the pile position of each pile on the road bed and marking, wherein the pile positions are arranged in an equilateral triangle, and the distance between every two adjacent pile positions is twice of the influence radius of each slurry spraying pile;
carrying out slurry spraying pile construction on the pile position to form a composite foundation;
excavating three-stage steps along a side slope line connecting the new dike and the old dike, and forming an expanded area;
carrying out slurry spraying pile construction on each step;
and carrying out roadbed backfilling on the widened area.
Further, the method comprises the steps of paving a geogrid on the composite foundation, backfilling a roadbed on the geogrid, and constructing a pavement structure layer on the roadbed.
Further, the excavation width of the step is 4 m.
Further, the construction of the slurry spraying pile comprises the following steps:
the drilling machine is installed and debugged and connected with a slurry conveying pipeline, and the drilling machine is moved to a pile position, so that a drill bit is aligned to the center of the pile position;
cement paste is prepared according to the requirement of the set mixing proportion, and the cement paste is poured into a paste pool which is communicated with a paste conveying pipeline;
and starting a drilling machine to drill and spray the pile position until a slurry spraying pile is formed.
In the embodiment of the application, the position of the road bed is leveled by breaking the road surface of the old road; determining the pile position of each pile on the road bed and marking, wherein the pile positions are arranged in an equilateral triangle, and the distance between every two adjacent pile positions is twice of the influence radius of each slurry spraying pile; the construction of the grout spraying pile is carried out on the pile position to form a composite foundation, thereby achieving the purpose of forming a stable composite roadbed by utilizing the consolidation reaction between the weak expansive soil and the grout spraying pile, realizing the technical effect of reinforcing the old roadbed of the weak expansive soil with high efficiency, environmental protection and low investment, and further solving the problems that the construction difficulty is high in the construction process of reinforcing the old roadbed of the weak expansive soil in the related technology, the dust is greatly mixed in the construction site, and the environmental protection requirement is not met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
FIG. 1 is a schematic structural diagram according to an embodiment of the present application;
FIG. 2 is a schematic plan view of a stake position in accordance with an embodiment of the present application;
wherein, 1 road bed, 2 pile positions, 3 grout spraying piles, 4 backfill road beds, 5 steps and 6 pavement structure layers.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used.
In this application, the terms "upper", "lower", "inside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "disposed," "provided," "connected," "secured," and the like are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 2, an embodiment of the present application provides a method for reinforcing an old weak expansive soil roadbed, including the following steps: breaking the road surface of the old road and leveling the position of the road bed 1; determining and marking the pile position 2 of each pile on the road bed 1, wherein the pile positions 2 are arranged in an equilateral triangle, and the distance between every two adjacent pile positions 2 is twice of the influence radius of each slurry spraying pile 3; and (3) carrying out construction of a guniting pile 3 on the pile position 2 to form a composite foundation.
In the embodiment, the old roadbed of the weak expansive soil is reinforced, and the traditional old roadbed of the weak expansive soil is reinforced by adopting site turning and mixing ash-doped construction, so that the site dust is large, the construction period is long, and the environment-friendly requirement is not met, therefore, the road surface of the old roadbed is firstly broken, the position of the roadbed 1 is leveled, the pile position 2 of each pile is determined on the roadbed 1 according to the design, the pile position 2 of each pile is determined by using a steel ruler at the construction site, a bamboo stick is inserted into a soil layer for marking, and the error of the pile position 2 of each pile is not more than 5 cm. Meanwhile, retest work is done, whether the mark of the pile position 2 is moved or not is checked frequently in the construction process, and the accuracy of the pile position 2 is ensured. Because pile position 2 is equilateral triangle setting, consequently the interval between adjacent pile position 2 is the same, and the influence scope of every pile position 2 starching jet pile 3 is confirmed by the diameter of thick liquid jet pile 3, and the diameter of using thick liquid jet pile 3 in this embodiment is 0.5m, explains for example that the interval between adjacent pile position 2 is 2m, and the influence radius of single thick liquid jet pile 3 is 1m, consequently sets up the interval between two thick liquid jet piles 3 to 2m to all-round consolidation with the old road bed of weak expansive soil. As the cement in the grout spraying pile 3 and the weak expansive soil generate consolidation reaction, the weak expansive soil around the grout spraying pile 3 is connected into a piece, so as to form a new composite roadbed and realize the stable reinforcement of the old roadbed of the weak expansive soil. Compared with the traditional construction method, the method does not need to stir and mix ash on site, realizes the technical effect of efficiently, environmentally and low-investment reinforcement of the old roadbed of the weak expansive soil, and further solves the problems that in the related technology, the construction difficulty is high in the construction process of reinforcing the old roadbed of the weak expansive soil, the stirring and mixing ash and dust on the construction site are large, and the requirement of environmental protection is not met.
The pile body of the slurry spraying pile 3 is designed to have unconfined compressive strength:
the unconfined compressive strength of the pile body is that R7 is more than or equal to 0.72MPa, R28 is more than or equal to 1.45MPa, and R90 is more than or equal to 2.5 MPa;
determining material requirements and cement mixing amount:
the cement is 42.5-grade ordinary portland cement, and the cement mixing amount is determined by an indoor mixing ratio test. According to the difference of the natural water content and the porosity ratio of the soil sample, the doping amount of the cement is changed correspondingly, the reference value is 55kg/m, and the reference value of the water cement ratio of the cement paste is 0.45-0.55. A reinforced soil indoor test is carried out before the construction of the slurry-jet pile 3, and the proper cement mixing amount is determined according to the requirements that R7 is more than or equal to 0.72Mpa and R28 is more than or equal to 1.45 Mpa.
The bearing capacity of the composite foundation treated by the slurry spraying pile 3 is not less than 180Kpa, and the bearing capacity of the composite foundation can be determined by a flat plate load test.
As shown in fig. 1 to 2, the method further comprises the steps of paving a geogrid on the composite foundation, backfilling a road bed 41 on the geogrid, constructing a pavement structure layer 6 on the backfilled road bed 41, wherein the backfilled road bed 41 is a 6% lime soil backfilled road bed 41 with the height of 0.8m, the pavement structure layer 6 is 0.6m high, the diameter of each slurry jet pile 3 is 0.4-1m, the distance between adjacent pile positions 2 is 1.5-4m, and the length of each slurry jet pile 3 is 7-10m, preferably 7 m.
As shown in fig. 1 to 2, the construction of the guniting pile 3 includes: the drilling machine is installed and debugged and connected with a slurry conveying pipeline, and the drilling machine is moved to the pile position 2, so that a drill bit is aligned to the center of the pile position 2; cement paste is prepared according to the requirement of the set mixing proportion, and the cement paste is poured into a paste pool which is communicated with a paste conveying pipeline; and starting a drilling machine to drill and spray the pile position 2 to form a cement spraying pile 3.
As shown in fig. 1 to 2, according to another aspect of the present application, there is provided a method for widening a weakly expansive soil old roadbed, including the steps of: breaking the road surface of the old road and leveling the position of the road bed 1; determining and marking the pile position 2 of each pile on the road bed 1, wherein the pile positions 2 are arranged in an equilateral triangle, and the distance between every two adjacent pile positions 2 is twice of the influence radius of each slurry spraying pile 3; carrying out construction of a slurry jet pile 3 on the pile position 2 to form a composite foundation, laying a geogrid on the composite foundation, backfilling a roadbed 1 on the geogrid, and constructing a pavement structure layer 6 on the roadbed 1; excavating three-stage steps 5 along a side slope line connecting a new dike and an old dike, wherein the excavation width of the steps 5 is 4m, and a widened area is formed; carrying out construction of the slurry spraying piles 3 on each step 5; and carrying out roadbed backfilling on the widened area.
The mode of above-mentioned embodiment is adopted to the reinforcement of the old road bed of weak bentonite in this embodiment, need widen the processing to old road bed after the reinforcement, through widening the road bed section design thick liquid shotcrete 3 and carrying out anti-settlement processing, and set up step 5 and carry out the reinforced connection, because old road bed filler used weak bentonite filler, traditional technology is for clearing up and filling again, or dig and turn over and mix lime soil, these two kinds of technologies require too high because fund input and time limit for a project, or because raise dust environmental protection problem is not required to be used, consequently adopt thick liquid shotcrete 3 to consolidate, produce through grout and weak bentonite and consolidate and reverse and carry out old road bed reinforcement.
As shown in fig. 1 to 2, the construction of the guniting pile 3 includes: the drilling machine is installed and debugged and connected with a slurry conveying pipeline, and the drilling machine is moved to the pile position 2, so that a drill bit is aligned to the center of the pile position 2; cement paste is prepared according to the requirement of the set mixing proportion, and the cement paste is poured into a paste pool which is communicated with a paste conveying pipeline; and starting a drilling machine to drill and spray the pile position 2 to form a cement spraying pile 3.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for reinforcing an old roadbed of weak expansive soil is characterized by comprising the following steps:
breaking the road surface of the old road and leveling the position of the road bed;
determining the pile position of each pile on the road bed and marking, wherein the pile positions are arranged in an equilateral triangle, and the distance between every two adjacent pile positions is twice of the influence radius of each slurry spraying pile;
and carrying out slurry spraying pile construction on the pile position to form a composite foundation.
2. The method for reinforcing the old foundation of the weak expansive soil as claimed in claim 1, further comprising the steps of laying a geogrid on the composite foundation, performing a backfill road bed on the geogrid, and constructing a road surface structure layer on the backfill road bed.
3. The method for reinforcing the old road foundation with the weak expansive soil as claimed in claim 2, wherein the backfill road bed is a 6% lime soil backfill road bed with a height of 0.8m, and the pavement structure layer is 0.6 m; the diameter of the slurry spraying pile is 0.4-1m, and the distance between adjacent pile positions is 1.5-4 m.
4. The method for reinforcing the old foundation of the weak expansive soil as claimed in claim 3, wherein the diameter of the slurry injection piles is 0.5m, and the distance between adjacent pile positions is 2 m.
5. The method for reinforcing the old foundation of the weak expansive soil according to claim 4, wherein the length of the guniting pile is 7-10 m.
6. The method for reinforcing the old road foundation with the weak expansive soil as claimed in claim 1, wherein the construction of the grout spraying pile comprises the following steps:
the drilling machine is installed and debugged and connected with a slurry conveying pipeline, and the drilling machine is moved to a pile position, so that a drill bit is aligned to the center of the pile position;
cement paste is prepared according to the requirement of the set mixing proportion, and the cement paste is poured into a paste pool which is communicated with a paste conveying pipeline;
and starting a drilling machine to drill and spray the pile position until a slurry spraying pile is formed.
7. A method for widening an old roadbed of weak expansive soil is characterized by comprising the following steps:
breaking the road surface of the old road and leveling the position of the road bed;
determining the pile position of each pile on the road bed and marking, wherein the pile positions are arranged in an equilateral triangle, and the distance between every two adjacent pile positions is twice of the influence radius of each slurry spraying pile;
carrying out slurry spraying pile construction on the pile position to form a composite foundation;
excavating three-stage steps along a side slope line connecting the new dike and the old dike, and forming an expanded area;
carrying out slurry spraying pile construction on each step;
and carrying out roadbed backfilling on the widened area.
8. The method for widening the old foundation of the weakly expansive soil as claimed in claim 7, further comprising the steps of laying a geogrid on the composite foundation, performing a backfill road bed on the geogrid, and constructing a road surface structure layer on the backfill road bed.
9. The method for widening the old foundation of weakly expansive soil according to claim 8, wherein the excavation width of the step is 4 m.
10. The method for widening the old foundation of the weak expansive soil as claimed in claim 9, wherein the construction of the grout spraying pile comprises:
the drilling machine is installed and debugged and connected with a slurry conveying pipeline, and the drilling machine is moved to a pile position, so that a drill bit is aligned to the center of the pile position;
cement paste is prepared according to the requirement of the set mixing proportion, and the cement paste is poured into a paste pool which is communicated with a paste conveying pipeline;
and starting a drilling machine to drill and spray the pile position until a slurry spraying pile is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011372425.7A CN112553991A (en) | 2020-11-30 | 2020-11-30 | Weak expansive soil old roadbed reinforcing method and widening method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011372425.7A CN112553991A (en) | 2020-11-30 | 2020-11-30 | Weak expansive soil old roadbed reinforcing method and widening method |
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| CN112553991A true CN112553991A (en) | 2021-03-26 |
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| CN202011372425.7A Pending CN112553991A (en) | 2020-11-30 | 2020-11-30 | Weak expansive soil old roadbed reinforcing method and widening method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113737592A (en) * | 2021-08-27 | 2021-12-03 | 中交一公局第五工程有限公司 | Highway subgrade widening structure |
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