CN113774892A - Control method for municipal engineering freezing, swelling and thawing settlement - Google Patents
Control method for municipal engineering freezing, swelling and thawing settlement Download PDFInfo
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- CN113774892A CN113774892A CN202111088776.XA CN202111088776A CN113774892A CN 113774892 A CN113774892 A CN 113774892A CN 202111088776 A CN202111088776 A CN 202111088776A CN 113774892 A CN113774892 A CN 113774892A
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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
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
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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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The invention discloses a method for controlling freezing, swelling and thawing-sinking of municipal works, belonging to the field of municipal works, which comprises the steps of conveying cement soil and lime soil to corresponding positions through grouting holes to form a freezing curtain to inhibit freezing, swelling and thawing-sinking caused by a freezing method, adding a certain amount of cement slurry and lime slurry into a soil body to improve the physical and mechanical properties of the soil body, and inhibiting the influence of freezing, swelling and thawing-sinking caused by reinforcing in municipal works ends, communication channels and tunnels by an artificial freezing method on surrounding buildings and stratums, wherein the method has the advantages that the whole designed freezing area is not required to be reinforced, the strength of partial soil body is enhanced by adopting a cement soil and lime soil local reinforcing mode to form an annular reinforced water-stop curtain, the impermeability and the strength of partial soil body are enhanced, the influence caused by freezing, swelling and thawing-sinking is effectively inhibited, and according to the strength of a freezing effect, the number of the annular reinforced waterproof curtains can be set automatically, and the construction time and the construction cost are reduced.
Description
Technical Field
The invention relates to the field of municipal engineering, in particular to a method for controlling freezing, swelling and thawing settlement of municipal engineering.
Background
At the present stage, municipal works in China are greatly developed, an artificial freezing method is that an artificial refrigeration technology is utilized to freeze frozen soil by water in natural soil, so that the strength of the soil is enhanced, and the influence of underground water on the works is isolated, the artificial freezing method is applied to more and more municipal works in near-river and sea areas, such as water and electricity pipelines, subways, underground parking lots and the like, because the near-river and sea areas have large-range water-rich soft soil layers, the frozen swelling and thawing sinking of the soil can be caused while the soil is reinforced by the artificial freezing method in end wells, foundation pits, communication channels and tunnels of the municipal works, and adverse effects are caused to surrounding strata and structures, the common solution method for the works with strict deformation requirements on the soil is that the whole designed frozen junction area is improved by the soil to inhibit the frozen swelling and thawing sinking, and the method for reinforcing the whole designed frozen junction area can firmly inhibit the frozen swelling and thawing sinking caused by the reinforcement of the artificial freezing method, but increases construction costs and time.
Disclosure of Invention
1. Technical problem to be solved
The method comprises a freezing system, a frost heaving and thaw settlement inhibition area system and a monitoring system, wherein the freezing system meets the freezing design requirements, the frost heaving and thaw settlement inhibition area system carries out soil body improvement at corresponding positions according to the design, and the monitoring system judges the freezing effect and the frost heaving and thaw settlement amount so as to collect data, provide basis for adjusting soil body improvement parameters of similar projects in the future and finally achieve the aim of the invention. The freezing area consists of a freezing system, and the freezing system comprises a refrigerating system, a freezing pipeline and a freezing hole; the frost heaving and thaw collapse inhibition area is composed of a frost heaving and thaw collapse control system, the frost heaving and thaw collapse control system is composed of a soil improvement system (soil improvement material, a soil improvement circulating pipeline and soil improvement equipment) and a temperature control system (freezing area edge arrangement is designed, and the frost heaving and thaw collapse control system is composed of a heating system and a circulating pipeline), the monitoring system is mainly composed of sensors (such as a temperature sensor, a moisture sensor, a settlement measuring point, a deep soil horizontal displacement measuring point and a pressure sensor), a data line and a data acquisition unit, other sensors can be arranged according to engineering requirements, and the sensors are reasonably arranged so as to judge freezing effect and frost heaving and thaw collapse effect. Related parameters of a freezing system and a soil body improvement system similar to engineering or geological conditions are adjusted through data of the monitoring system.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A method for controlling municipal engineering freezing, swelling and thawing settlement comprises the following steps:
s1, surveying: surveying nearby an excavation area, and simulating and arranging the positions of freezing holes, frost heaving, thawing and sinking inhibition holes and monitoring holes according to design, wherein the monitoring holes comprise temperature measuring holes and sensors, and form a corresponding freezing system, a frost heaving thawing and sinking inhibition area system and a monitoring system;
s2, digging: excavating a frost heaving and thaw settlement inhibition area near the excavation area, forming an annular freezing curtain between the excavation area and the frost heaving and thaw settlement inhibition area, and meanwhile, placing excavated soil aside for later use;
s3, installation: respectively installing various components in a freezing system, a frost heaving and thaw settlement inhibition area system and a monitoring system in the frost heaving and thaw settlement inhibition area according to the positions of the simulation arrangement;
s4, pipe laying: respectively paving a soil body improvement circulating pipeline, a heating circulating pipeline and a freezing pipeline in the frost heaving and thaw collapse inhibition area;
s5, grouting: 1) injecting: proportioning cement soil and lime soil according to a certain proportion, injecting a proper amount of proportioned slurry through a grouting device, and quickly backfilling the excavated soil;
2) and (3) infiltration: the mud permeates into the soil which is just backfilled through a soil body improvement circulating pipeline;
3) extruding: extruding residual slurry in the grouting device into soil by a hot extrusion ball;
s6, freezing: and freezing the cement soil through a freezing pipeline.
Further, the freezing system in the step S1 includes a freezing hole, a freezing pipeline and a refrigerating system, the frost heaving and thaw collapse inhibition area system includes a soil improvement system and a temperature control system, the monitoring system includes a sensor, a data line and a data collector, a database can be formed after a large number of projects are performed through a total system composed of the freezing system, the frost heaving and thaw collapse inhibition system and the monitoring system, and proper frost heaving and thaw collapse design parameters are obtained according to project and geological data, so that subsequent project construction operations are facilitated.
Further, the cement soil and the lime soil in the step S5 are proportioned according to a ratio of 3:1, the total amount of the proportioned slurry is 10% -15% of the total mass of the excavated soil, the proportioning proportion is the optimal cement soil anti-settling proportion, a freezing zone and a frost heaving and thaw collapse inhibition zone are formed to jointly bear the external water and soil pressure, and the frost heaving and thaw collapse inhibition zone has the function of forming a partition layer at the boundary and inside of the freezing zone to reduce the water migration of the freezing curtain, so that the frost heaving and thaw collapse are reduced.
Further, the soil body improvement circulation pipeline in the step S4 comprises a grouting hole, an anti-seepage pipeline is fixedly connected to the bottom end of the grouting hole, a filter stone net is fixedly connected to the top end of the anti-seepage pipeline, anti-backflow ports are uniformly connected to the outer portion of the anti-seepage pipeline, and the anti-seepage pipeline and the anti-backflow ports are communicated with each other.
Further, the hot-pressing extrusion ball in the step S5 is placed inside the anti-seepage pipeline, the hot-pressing extrusion ball comprises a thermal expansion capsule, a blocking cover and an arc groove, the thermal expansion capsule is in contact with the inner wall of the anti-seepage pipeline (2), the arc groove is uniformly cut on the outer wall of the thermal expansion capsule, and the blocking cover is connected to the arc groove cut in the thermal expansion capsule in a matching manner.
Furthermore, the separation cover is made of water-soluble materials, calcium oxide particles are filled in the arc groove, ammonium chloride particles are filled in the thermal expansion capsule, the thermal expansion capsule is made of polyurethane materials, in the process that proportioned slurry is injected into the anti-seepage pipeline, as the slurry contains moisture, when the moisture in the slurry contacts the separation cover, the separation cover is dissolved, the moisture is further contacted with the calcium oxide particles filled in the arc groove, a large amount of heat is released, the heat is transferred to the ammonium chloride particles filled in the arc groove through the thermal expansion capsule, the ammonium chloride particles are pyrolyzed to generate a large amount of gas, the thermal expansion capsule is expanded to fill the whole anti-seepage pipeline, and then the residual slurry in the anti-seepage pipeline is completely extruded, so that the mixing ratio of the slurry and the soil reaches the preset ratio, and the anti-frost heaving, frost heaving and cement of the soil are prevented, The melting and sinking effect is optimal.
Furthermore, the quantity of prevention of seepage pipeline and stone screen is two, evenly distributed in the both ends of controlling of injected hole, and the stone in the soil can be got rid of to the prevention of seepage pipeline when soil backfills, avoids the stone to cement soil prevent frost heaving, melt the sinking effect and produce the influence, and the shape of prevention of seepage pipeline is the V-arrangement for mud can freely permeate to the different aspect of frost heaving, melt the sinking inhibition zone, and needn't all lay the pipeline at the aspect, has reduced engineering cost, the opening direction of preventing the backflow mouth keeps unanimous with the trend of prevention of seepage pipeline, can effectively avoid soil to enter into inside the prevention of seepage pipeline at the in-process of backfilling, blocks up the prevention of seepage pipeline, makes the mud of ratio can't stretch into in the soil smoothly.
Furthermore, the diameter of the hot extrusion ball is smaller than that of the anti-seepage pipeline, so that the situation that subsequent grouting operation is affected due to blockage when the hot extrusion ball is placed in the anti-seepage pipeline is avoided, and the number of the backflow preventing openings is four, so that mud can uniformly permeate in all directions of soil.
Furthermore, the refrigerating temperature of the refrigerating system is set to be minus 20 ℃ to minus 30 ℃, and the compressive strength of the cement soil at the temperature is 5 times to 6 times of that of the cement soil at 20 ℃.
Furthermore, the number of the freezing curtains in the step S2 can be set according to the strength of the freezing effect, the thickness and the number of the frost heaving and thawing depression areas can be flexibly controlled according to specific engineering, the construction time and the cost are reduced, and the whole designed freezing area does not need to be fixed.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the method comprises a freezing system, a frost heaving and thaw settlement inhibition zone system and a monitoring system, wherein the freezing system meets the freezing design requirement, the frost heaving and thaw settlement inhibition zone system carries out soil improvement at a corresponding position according to the design, and the monitoring system judges the freezing effect and the frost heaving and thaw settlement amount so as to collect data and provide a basis for adjusting soil improvement parameters of similar projects in the future, thereby finally achieving the invention goal. The freezing area consists of a freezing system, and the freezing system comprises a refrigerating system, a freezing pipeline and a freezing hole; the frost heaving and thaw collapse inhibition area is composed of a frost heaving and thaw collapse control system, the frost heaving and thaw collapse control system is composed of a soil improvement system (soil improvement material, a soil improvement circulating pipeline and soil improvement equipment) and a temperature control system (freezing area edge arrangement is designed, and the frost heaving and thaw collapse control system is composed of a heating system and a circulating pipeline), the monitoring system is mainly composed of sensors (such as a temperature sensor, a moisture sensor, a settlement measuring point, a deep soil horizontal displacement measuring point and a pressure sensor), a data line and a data acquisition unit, other sensors can be arranged according to engineering requirements, and the sensors are reasonably arranged so as to judge freezing effect and frost heaving and thaw collapse effect. Related parameters of a freezing system and a soil body improvement system similar to engineering or geological conditions are adjusted through data of the monitoring system.
(2) A database can be formed after a large number of projects are carried out through a total system consisting of the freezing system, the frost heaving and thawing settlement inhibiting system and the monitoring system, and proper frost heaving and thawing settlement design parameters are obtained according to project and geological data, so that the subsequent project construction operation is facilitated.
(3) The cement soil and the lime soil in the step S5 are proportioned according to the proportion of 3:1, the total amount of the proportioned slurry is 10% -15% of the total mass of the excavated soil, the proportioned proportion is the optimal cement soil anti-settling proportion, a freezing zone and a frost heaving and thaw collapse inhibition zone are formed to jointly bear the external water and soil pressure, and the frost heaving and thaw collapse inhibition zone has the function of reducing the water migration of the freezing curtain by forming a partition layer on the boundary of the freezing zone and inside the freezing zone, so that the frost heaving and thaw collapse are reduced.
(4) In the process of injecting the proportioned slurry into the anti-seepage pipeline, because the slurry contains moisture, when the moisture in the slurry contacts the separation cover, the separation cover is dissolved, and then the moisture contacts with the calcium oxide particles filled in the arc groove, a large amount of heat is released, the heat is transferred to the ammonium chloride particles filled in the arc groove through the thermal expansion capsules, the ammonium chloride particles are pyrolyzed to generate a large amount of gas, so that the thermal expansion capsules swell to fill the whole anti-seepage pipeline, and further the residual slurry in the anti-seepage pipeline is completely extruded, so that the mixing ratio of the slurry and the soil reaches the expected set ratio, and the anti-frost heaving and thawing effect of the cement soil reaches the best.
(5) The seepage-proof pipelines and the stone filter nets are uniformly distributed at the left end and the right end of the grouting hole, the seepage-proof pipelines can remove stones in soil when the soil is backfilled, the influence of the stones on frost heaving prevention and thaw collapse effects of cement soil is avoided, the seepage-proof pipelines are V-shaped, mud can freely permeate into different layers of frost heaving and thaw collapse inhibition areas, pipelines do not need to be laid on the layers, engineering cost is reduced, the opening direction of the backflow prevention port is consistent with the trend of the seepage-proof pipelines, the situation that the soil enters the seepage-proof pipelines in the backfilling process and blocks the seepage-proof pipelines can be effectively avoided, and proportioned mud can not smoothly stretch into the soil.
(6) The diameter of the hot extrusion ball is smaller than that of the seepage-proofing pipeline, so that the phenomenon that the subsequent grouting operation is influenced due to the blockage when the hot extrusion ball is placed in the seepage-proofing pipeline is avoided, and the number of the backflow-preventing openings is four, so that the mud can uniformly permeate in all directions of the soil.
(7) The refrigerating temperature of the refrigerating system is set to be minus 20 ℃ to minus 30 ℃, and the compressive strength of the cement soil at the temperature is 5 times to 6 times of that of the cement soil at the temperature of 20 ℃.
(8) The number of the freezing curtains in the step S2 can be set according to the strength of the freezing effect, the thickness and the number of the frost heaving and thaw collapse inhibition areas can be flexibly controlled according to specific engineering, the construction time and the cost are reduced, and the whole designed freezing area does not need to be fixed.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic view of the main structure of the present invention;
FIG. 3 is a diagram illustrating the relationship between systems according to the present invention;
FIG. 4 is a schematic diagram of the components of the freezing system of the present invention;
FIG. 5 is a schematic diagram of the frost heaving thaw collapse zone system components of the present invention;
FIG. 6 is a schematic diagram of the components of the monitoring system of the present invention;
FIG. 7 is a schematic view of a portion of the improved circulation line of the soil of the present invention;
FIG. 8 is a schematic cross-sectional view of an impermeable pipe of the present invention;
FIG. 9 is a schematic view of the structure of FIG. 8 at A in accordance with the present invention;
FIG. 10 is a schematic diagram of reinforcement of a communication channel;
FIG. 11 is a reinforced cross-sectional view;
fig. 12 schematic view of reinforcement inside a tunnel.
The reference numbers in the figures illustrate:
1. grouting holes; 2. an impermeable pipe; 3. a stone filter screen; 4. a backflow prevention port; 51. a thermally expandable capsule; 52. a barrier cover; 53. an arc groove.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1-2, a method for controlling freezing, swelling and thawing of municipal works comprises the following steps:
s1, surveying: surveying nearby an excavation area, and simulating and arranging the positions of freezing holes, frost heaving, thawing and sinking inhibition holes and monitoring holes according to design, wherein the monitoring holes comprise temperature measuring holes and sensors, and form a corresponding freezing system, a frost heaving thawing and sinking inhibition area system and a monitoring system;
s2, digging: excavating a frost heaving and thaw settlement inhibition area near the excavation area, forming an annular freezing curtain between the excavation area and the frost heaving and thaw settlement inhibition area, and meanwhile, placing excavated soil aside for later use;
s3, installation: respectively installing various components in a freezing system, a frost heaving and thaw settlement inhibition area system and a monitoring system in the frost heaving and thaw settlement inhibition area according to the positions of the simulation arrangement;
s4, pipe laying: respectively paving a soil body improvement circulating pipeline, a heating circulating pipeline and a freezing pipeline in the frost heaving and thaw collapse inhibition area;
s5, grouting: 1) injecting: proportioning cement soil and lime soil according to a certain proportion, injecting a proper amount of proportioned slurry through a grouting device, and quickly backfilling the excavated soil;
4) and (3) infiltration: the mud permeates into the soil which is just backfilled through a soil body improvement circulating pipeline;
5) extruding: extruding residual slurry in the grouting device into soil by a hot extrusion ball;
s6, freezing: and freezing the cement soil through a freezing pipeline.
The cement soil and the lime soil in the step S5 are proportioned according to the proportion of 3:1, the total amount of the proportioned slurry is 10% -15% of the total mass of the excavated soil, the proportioned proportion is the optimal cement soil anti-settling proportion, a freezing zone and a frost heaving and thaw collapse inhibition zone are formed to jointly bear the external water and soil pressure, and the frost heaving and thaw collapse inhibition zone has the function of reducing the water migration of the freezing curtain by forming a partition layer on the boundary of the freezing zone and inside the freezing zone, so that the frost heaving and thaw collapse are reduced.
Referring to fig. 3-6, the freezing system in step S1 includes a freezing hole, a freezing pipeline and a refrigerating system, the frost heaving and thaw collapse suppression area system includes a soil improvement system and a temperature control system, the monitoring system includes a sensor, a data line and a data collector, a database can be formed after a large number of projects are performed on the total system composed of the freezing system, the frost heaving and thaw collapse suppression system and the monitoring system, and appropriate frost heaving and thaw collapse design parameters are obtained according to project and geological data, thereby facilitating subsequent project construction operations.
The refrigerating temperature of the refrigerating system is set to be minus 20 ℃ to minus 30 ℃, and the compressive strength of the cement soil at the temperature is 5 times to 6 times of that of the cement soil at 20 ℃.
Referring to fig. 7-9, the soil improvement circulation pipeline in step S4 includes a grouting hole 1, an anti-seepage pipeline 2 is fixedly connected to the bottom end of the grouting hole 1, a stone filter 3 is fixedly connected to the top end of the anti-seepage pipeline 2, anti-backflow ports 4 are uniformly connected to the outside of the anti-seepage pipeline 2, and the anti-seepage pipeline 2 and the anti-backflow ports 4 are communicated with each other.
The hot-pressing extrusion ball in the step S5 is placed inside the anti-seepage pipeline 2, the hot-pressing extrusion ball comprises a thermal expansion capsule 51, a blocking cover 52 and an arc groove 53, the thermal expansion capsule 51 is in contact with the inner wall of the anti-seepage pipeline 2, the arc groove 53 is uniformly cut on the outer wall of the thermal expansion capsule 51, and the blocking cover 52 is connected to the arc groove 53 cut in the thermal expansion capsule 51 in a matching manner.
The blocking cover 52 is made of water-soluble material, calcium oxide particles are filled in the arc groove 53, ammonium chloride particles are filled in the thermal expansion capsule 51, the thermal expansion capsule 51 is made of polyurethane material, in the process of injecting the proportioned mud into the anti-seepage pipeline 2, because the mud contains moisture, when the moisture in the mud contacts the obstruction cover 52, the obstruction cover 52 is dissolved, and then the water contacts with the calcium oxide particles filled in the arc groove 53 to release a large amount of heat, the heat is transferred to the ammonium chloride particles filled in the arc groove through the thermal expansion capsule 51, the ammonium chloride particles are pyrolyzed to generate a large amount of gas, so that the thermal expansion capsule 51 is expanded to fill the inside of the whole anti-seepage pipeline 2, and further, the residual slurry in the anti-seepage pipeline 2 is completely extruded out, so that the mixing ratio of the slurry and the soil reaches the expected set ratio, and the effects of preventing frost heaving and thawing sinking of the cement soil reach the best.
Referring to fig. 7, the number of the seepage-proofing pipelines 2 and the number of the stone screens 3 are two, the seepage-proofing pipelines 2 and the stone screens 3 are uniformly distributed at the left end and the right end of the grouting hole 1, stones in soil can be removed by the seepage-proofing pipelines 2 when the soil is backfilled, the influence of the stones on frost heaving prevention and thaw collapse effects of cement soil is avoided, the seepage-proofing pipelines 2 are in a V shape, mud can freely permeate into different layers of frost heaving and thaw collapse inhibition areas, pipelines do not need to be laid on the layers, engineering cost is reduced, the opening direction of the backflow-preventing port 4 is consistent with the moving direction of the seepage-proofing pipelines 2, the situation that the soil enters the seepage-proofing pipelines 2 in the backfilling process can be effectively avoided, the seepage-proofing pipelines 2 are blocked, and the proportioned mud cannot smoothly stretch into the soil.
Referring to fig. 8, the diameter of the hot extrusion ball is smaller than that of the anti-seepage pipeline 2, so that the situation that the subsequent grouting operation is affected due to blockage when the hot extrusion ball is placed in the anti-seepage pipeline 2 is avoided, and the number of the anti-backflow ports 4 is four, so that the mud can uniformly permeate in all directions of the soil.
Referring to fig. 10-12, the number of freezing curtains in step S2 can be set according to the strength of the freezing effect, so that the thickness and number of the frost heaving and thaw collapse suppression areas can be flexibly controlled according to the specific engineering, the construction time and cost are reduced, and the whole designed freezing area does not need to be fixed.
The method comprises a freezing system, a frost heaving and thaw settlement inhibition zone system and a monitoring system, wherein the freezing system meets the freezing design requirement, the frost heaving and thaw settlement inhibition zone system carries out soil improvement at a corresponding position according to the design, and the monitoring system judges the freezing effect and the frost heaving and thaw settlement amount to collect data so as to provide a basis for adjusting soil improvement parameters of similar projects in the future and finally achieve the aim of the invention. The freezing area consists of a freezing system, and the freezing system comprises a refrigerating system, a freezing pipeline and a freezing hole; the frost heaving and thaw collapse inhibition area is composed of a frost heaving and thaw collapse control system, the frost heaving and thaw collapse control system is composed of a soil improvement system (soil improvement material, a soil improvement circulating pipeline and soil improvement equipment) and a temperature control system (freezing area edge arrangement is designed, and the frost heaving and thaw collapse control system is composed of a heating system and a circulating pipeline), the monitoring system is mainly composed of sensors (such as a temperature sensor, a moisture sensor, a settlement measuring point, a deep soil horizontal displacement measuring point and a pressure sensor), a data line and a data acquisition unit, other sensors can be arranged according to engineering requirements, and the sensors are reasonably arranged so as to judge freezing effect and frost heaving and thaw collapse effect. Related parameters of a freezing system and a soil body improvement system similar to engineering or geological conditions are adjusted through data of the monitoring system.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (10)
1. A municipal engineering freezing, swelling and thawing control method is characterized by comprising the following steps: the method comprises the following steps:
s1, surveying: surveying nearby an excavation area, and simulating and arranging the positions of freezing holes, frost heaving, thawing and sinking inhibition holes and monitoring holes according to design, wherein the monitoring holes comprise temperature measuring holes and sensors, and form a corresponding freezing system, a frost heaving thawing and sinking inhibition area system and a monitoring system;
s2, digging: excavating a frost heaving and thaw settlement inhibition area near the excavation area, forming an annular freezing curtain between the excavation area and the frost heaving and thaw settlement inhibition area, and meanwhile, placing excavated soil aside for later use;
s3, installation: respectively installing various components in a freezing system, a frost heaving and thaw settlement inhibition area system and a monitoring system in the frost heaving and thaw settlement inhibition area according to the positions of the simulation arrangement;
s4, pipe laying: respectively paving a soil body improvement circulating pipeline, a heating circulating pipeline and a freezing pipeline in the frost heaving and thaw collapse inhibition area;
s5, grouting: 1) injecting: proportioning cement soil and lime soil according to a certain proportion, injecting a proper amount of proportioned slurry through a grouting device, and filling a drilling space;
and (3) infiltration: the mud permeates into the soil which is just backfilled through a soil body improvement circulating pipeline;
and (3) solidification: the slurry is solidified to form a structure which is impermeable to water or contains less water;
s6, freezing: and freezing the cement soil through a freezing pipeline.
2. The method for controlling the municipal engineering frozen swelling and thawing according to claim 1, wherein the method comprises the following steps: the freezing system in the step S1 comprises a freezing hole, a freezing pipeline and a refrigerating system, the frost heaving and thaw collapse inhibition zone system comprises a soil body improvement system and a temperature control system, and the monitoring system comprises a sensor, a data line and a data acquisition unit.
3. The method for controlling the municipal engineering frozen swelling and thawing according to claim 1, wherein the method comprises the following steps: the cement soil and the lime soil in the step S5 are proportioned according to the proportion of 3:1, and the total injection amount of the proportioned mud is 10% -15% of the total mass of the excavated soil.
4. The method for controlling the municipal engineering frozen swelling and thawing according to claim 1, wherein the method comprises the following steps: the soil body improvement circulation pipeline in the step S4 comprises a grouting hole (1), an anti-seepage pipeline (2) is fixedly connected to the bottom end of the grouting hole (1), a stone filter net (3) is fixedly connected to the top end of the anti-seepage pipeline (2), a backflow preventing port (4) is uniformly connected to the outer portion of the anti-seepage pipeline (2), and the anti-seepage pipeline (2) and the backflow preventing port (4) are communicated with each other.
5. The method for controlling the municipal engineering frozen swelling and thawing according to claim 1, wherein the method comprises the following steps: the hot-pressing extrusion ball in the step S5 is placed inside the anti-seepage pipeline (2), the hot-pressing extrusion ball comprises a thermal expansion capsule (51), a blocking cover (52) and an arc groove (53), the thermal expansion capsule (51) is in contact with the inner wall of the anti-seepage pipeline (2), the arc groove (53) is uniformly cut on the outer wall of the thermal expansion capsule (51), and the blocking cover (52) is connected to the arc groove (53) cut in the thermal expansion capsule (51) in a matching manner.
6. The method for controlling the municipal engineering frozen swelling and thawing according to claim 5, wherein the method comprises the following steps: the blocking cover (52) is made of water-soluble materials, calcium oxide particles are filled in the arc groove (53), ammonium chloride particles are filled in the thermal expansion capsule (51), and the thermal expansion capsule (51) is made of polyurethane materials.
7. The method for controlling the municipal engineering frozen swelling and thawing according to claim 5, wherein the method comprises the following steps: the number of the seepage-proofing pipelines (2) and the filter stone nets (3) is two, the seepage-proofing pipelines are uniformly distributed at the left end and the right end of the grouting hole (1), the seepage-proofing pipelines (2) are V-shaped, and the opening direction of the backflow-preventing port (4) is consistent with the trend of the seepage-proofing pipelines (2).
8. The method for controlling the municipal engineering frozen swelling and thawing according to claim 5, wherein the method comprises the following steps: the diameter of the hot extrusion ball is smaller than that of the anti-seepage pipeline (2), and the number of the anti-backflow ports (4) is four.
9. The method for controlling the municipal engineering frozen swelling and thawing according to claim 3, wherein the method comprises the following steps: the refrigerating temperature of the refrigerating system is set to be minus 20 ℃ to minus 30 ℃.
10. The method for controlling the municipal engineering frozen swelling and thawing according to claim 1, wherein the method comprises the following steps: the number of frozen curtains in the step S2 can be set by itself according to the strength of the freezing effect.
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|---|---|---|---|---|
| JPH08338016A (en) * | 1995-06-13 | 1996-12-24 | Seiken:Kk | Method for freezing-expansion countermeasure construction |
| CN104963334A (en) * | 2015-07-13 | 2015-10-07 | 南京林业大学 | Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing |
| CN105257297A (en) * | 2015-11-04 | 2016-01-20 | 中铁十八局集团有限公司 | Construction method for precisely controlling frozen soil curtain among pipes |
| CN113266373A (en) * | 2021-06-24 | 2021-08-17 | 北京中煤矿山工程有限公司 | Freezing wall and cement reinforcement combined enclosure system in large-section tunnel construction and excavation method thereof |
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- 2021-09-16 CN CN202111088776.XA patent/CN113774892B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08338016A (en) * | 1995-06-13 | 1996-12-24 | Seiken:Kk | Method for freezing-expansion countermeasure construction |
| CN104963334A (en) * | 2015-07-13 | 2015-10-07 | 南京林业大学 | Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing |
| CN105257297A (en) * | 2015-11-04 | 2016-01-20 | 中铁十八局集团有限公司 | Construction method for precisely controlling frozen soil curtain among pipes |
| CN113266373A (en) * | 2021-06-24 | 2021-08-17 | 北京中煤矿山工程有限公司 | Freezing wall and cement reinforcement combined enclosure system in large-section tunnel construction and excavation method thereof |
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