CN114197541B - Rigid-flexible grating and broken stone combined filling method for inhibiting frost heaving of underground structure cavity - Google Patents
Rigid-flexible grating and broken stone combined filling method for inhibiting frost heaving of underground structure cavity Download PDFInfo
- Publication number
- CN114197541B CN114197541B CN202111575736.8A CN202111575736A CN114197541B CN 114197541 B CN114197541 B CN 114197541B CN 202111575736 A CN202111575736 A CN 202111575736A CN 114197541 B CN114197541 B CN 114197541B
- Authority
- CN
- China
- Prior art keywords
- frost
- bars
- frost heaving
- heaving
- bar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/14—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against frost heaves in soil
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Hydrology & Water Resources (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The application discloses a rigid-flexible grating and gravel combined filling method for inhibiting frost heaving of a cavity of an underground structure. The frost heaving prevention grid structure is a rigid-flexible grid structure formed by three materials of steel bars, rubber materials and foam, can effectively absorb frost heaving force in a cavity of the underground structure, and has certain bearing capacity and integrity. The frost heaving prevention grid structure consists of frost heaving prevention bars and frost heaving prevention plates, wherein the frost heaving prevention bars in the frost heaving prevention grid structure mainly comprise longitudinal bars, transverse bars and erection bars; the frost heaving prevention plate is in a saw-tooth shape, foam filling is arranged in the frost heaving prevention plate, and meanwhile, a drain hole is formed. The filling method is simple and feasible, has a simple and flexible internal structure, good integrity, low cost and excellent frost heaving prevention effect, does not influence the water collecting and draining performance of the underground structure, and has wide application prospect.
Description
Technical Field
The application relates to the technical field of durability protection of underground structures, in particular to a rigid-flexible grid and crushed stone combined filling method for inhibiting frost heaving of a cavity of an underground structure.
Background
In order to meet the requirements of water collection, drainage and the like in actual geotechnical engineering or geological engineering, some underground structures are designed to be cavity structures, and broken stone filling is carried out in the cavities. For example, a kind of water-force integrated control retaining structure (such as application number CN201910782855.7, a slide-resistant pile structure with multi-region joint drainage function and a construction method thereof, application number CN201611268913.7, a semi-hollow pile with drainage-slide-resistant function and a construction method thereof, application number CN201911059301.0, a permeable gravity retaining wall structure embedded with gravel column and a construction method thereof, CN11039 7049B, a buttress retaining wall with drainage function and a construction method thereof, and the like) is provided for effectively treating a hydraulic driving type landslide, the cavity of the retaining structure provides a drainage collecting space, and broken stone filled in the cavity has the main functions of supporting, increasing dead weight, guaranteeing the fluidity of water in the cavity, and the like. Meanwhile, the retaining structure has the remarkable advantages of excellent water collecting and draining performance, good structural integrity, low cost, small dead weight, environment-friendly materials, green ecology and the like, and has wide application prospect. However, if the underground structure with the cavity is applied to the region where seasonal frozen soil is located, the broken stone filling material can still ensure the water collecting and draining performance before freezing; however, once the air temperature is reduced, the soil body is frozen, and the structure cannot continue to collect and drain water. Because the structure has good water collecting effect, the water content of the frozen broken stone filling material is high, and the underground water collected in the frozen broken stone filling material is converted into ice, the broken stone filling material is obviously frozen and swelled, and the frost heaving force is directly transferred to the structure where the broken stone filling material is positioned, so that the structure is cracked or even damaged, and finally the water collecting and draining effect and the durability of the structure are seriously influenced.
At present, no frost heaving prevention design is carried out on the crushed stone filling material in a state of water saturation or larger water content, and no targeted frost heaving prevention design is carried out on the underground structure cavity filled with crushed stone.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a rigid-flexible grid and broken stone combined filling method for inhibiting the frost heave of a cavity of an underground structure, which is simple and easy to operate, has low cost, can effectively reduce the frost heave force in the structure, prevents the frost heave damage of the structure where broken stone filling materials are located, solves the frost heave problem of the underground structure with functions of broken stone filling, cavity, water collecting and draining and the like, ensures that the filled broken stone in the cavity of the underground structure has flexibility, certain deformation resistance and frost heave resistance in a water-rich frost heave state, and ensures the durability of the structure.
In order to solve the problems, the application adopts the following technical scheme:
a method for filling the cavities of underground structure with rigid-flexible grids and broken stone in a combined mode includes such steps as filling the anti-freezing grids and broken stone filler in a combined mode.
An anti-frost-heave grid structure for inhibiting frost heave of a cavity of an underground structure, wherein the anti-frost-heave grid structure (2) comprises an anti-frost-heave bar (3) and an anti-frost-heave plate (4); the anti-freezing expansion bar (3) forms a supporting reinforcement cage, the anti-freezing expansion plate is provided with a drainage hole corresponding to the drainage channel of the underground structure, the reinforcement cage of the anti-freezing expansion bar is wrapped with a flexible deformation structure, the anti-freezing expansion plate is assembled along the outer surface of the longitudinal side wall of the anti-freezing expansion bar along the height direction, the anti-freezing expansion bar and the anti-freezing expansion plate form an integrated structure, and the outer surfaces of the anti-freezing expansion bar and the anti-freezing expansion plate are both provided with structures meshed with broken stones or filled soil.
The flexible deformation structure has certain flexibility and crack resistance, the frost heaving grid structure is an integrated grid structure, the bending resistance and the shearing resistance bearing capacity are strong, the frost heaving grid structure is used for preventing final failure caused by breakage due to extrusion of crushed stone in a crushed stone filling material, meanwhile, the water collecting and draining function of an underground structure can be realized, the design of the occlusion structure enables the frost heaving grid structure to be coupled with a crushed stone layer, the grid structure is paved along the depth direction of the crushed stone layer, and frost heaving force is reduced through the rigid-flexible characteristic of the grid, so that frost heaving is effectively restrained. The snap-in structure may be provided in the form of threads, saw tooth shapes, waves, etc.
Further, the main function of the anti-freezing expansion grid structure is to coordinate the forced deformation with the crushed stone filling material, absorb the frost heaving force of the crushed stone filling material, prevent the frost heaving force from being transferred to the structural surface, and simultaneously ensure the water collecting and draining performance, the retaining performance and the durability of the structure. The frost heaving prevention plate is used for absorbing frost heaving force of the crushed stone material as much as possible. The main function of the frost heaving bar is to improve the integrity and the stress performance of the frost heaving grating structure, so that the frost heaving grating structure cannot be greatly deformed or damaged under the condition of being subjected to larger frost heaving force.
Further, the anti-frost-heaving bar mainly comprises three parts of reinforcing steel bars, foam materials and rubber materials. The reinforcing steel bars mainly improve the bearing capacity of the bars, and prevent the frost heaving prevention grid structure from being damaged or greatly deformed due to insufficient bearing capacity. The foam material has the same function as the foam in the anti-frost-heave plate; the rubber material is flexible and can absorb frost heaving force, and the main purpose of the rubber material is to wrap the material inside the bar, and meanwhile, the steel bar is prevented from being rusted, so that the flexible material is prevented from being damaged.
Further, the outer surface of the frost heaving bar is provided with threads, so that the frost heaving bar is of a structure capable of being meshed with broken stone or filling soil, and the aim of the frost heaving bar is to strengthen the biting force of the bar and the broken stone filling material, so that the frost heaving force is transmitted to the frost heaving grating structure as much as possible, and the position of the frost heaving grating structure is guaranteed not to slide.
Further, the frost heaving prevention plate has a saw-tooth shape, so that the biting force between the plate and broken stone can be improved, the sliding of the frost heaving prevention grid structure is prevented, and the frost heaving force can be effectively transmitted to the frost heaving prevention plate; the saw teeth can increase the thickness of the plate, further increase the bearing capacity and provide enough space for filling the inside of the plate. The frost heaving prevention plate is mainly made of rubber materials, foam is filled in the frost heaving prevention plate, the elasticity of the frost heaving prevention plate can be improved, and meanwhile, the foam can play roles in heat preservation and negative temperature transmission resistance; the frost heaving prevention plate is provided with the drain hole, so that the filling method can not influence the water collecting and draining performance of the structure.
Further, the outer contour shape of the anti-freezing expansion grid structure is consistent with the cross section shape of the cavity of the retaining structure, but the cross section size is smaller than the cross section of the cavity, so that the frost heaving force of the crushed stone filling material in the cross section of the cavity can be uniformly and omnidirectionally absorbed.
Furthermore, the height range of the anti-freezing expansion grid structure is 30cm-50cm, the broken stone filling materials are filled in layers, and each layer of broken stone filling material is internally provided with at least two rings of anti-freezing expansion grid structures which are mutually nested and then connected with other parts into a whole, so that the freezing expansion force of the anti-freezing expansion grid structure is reduced. The limitation of the height can reduce the stress of the longitudinal bars of the grille and prevent the grille from being greatly deformed or even damaged. Meanwhile, the frost heaving resistance grid structures are mutually independent in each height range, so that frost heaving force can be absorbed respectively; once the anti-frost-heave grid structure in a certain height range is damaged, the anti-frost-heave effect at other positions can not be affected.
Further, when the frost heaving force is large or the cross section of the cavity of the retaining structure is large, the number and the diameter of longitudinal bars and transverse bars can be increased, the cross section of the frost heaving grating structure can be increased, the thickness of the frost heaving plate is increased, or a plurality of rings of stand bars are nested in the frost heaving grating structure, and each ring of stand bars and the transverse bars, the longitudinal bars and the frost heaving plate which are connected and installed with the stand bars are reliably connected to form a whole.
Further, the rubber material required by the anti-frost-swelling grid structure can be formed by secondary processing of rubber material products such as junked tires; the foam material required by the frost heaving prevention grid structure can be formed by secondary processing of waste foam products.
The application has the beneficial effects that:
(1) The grid structure is mainly aimed at an underground structure with broken stone filling, cavities and water collecting and draining functions, but the grid structure is also applicable to filling other types of soil bodies (such as fine sand layers, medium and coarse sand layers and the like) in the cavities of the underground structure. Filling the rigid-flexible grating without affecting the existing design and function of such underground structure; the drainage performance of the existing structure, the compactness of broken stone and the good meshing effect of the grid and the broken stone are not influenced during arrangement, so that flexibility, coordination stress and deformation are realized, frost heaving force is reduced, and the underground structure is finally guaranteed not to be damaged by frost heaving.
(2) The filling method is simple and feasible, the internal structure of the crushed stone filling material is simple and flexible, the cost is low, and the construction is convenient; the filling method of the application ensures that the hollow underground structure has good frost heaving resistance and simultaneously does not influence the water collecting and draining performance.
(3) Due to the rigidity-flexibility characteristics of the anti-freezing expansion grille, the anti-freezing expansion grille can coordinate with crushed stone filled soil body to deform under stress, and effectively absorb frost heaving force; and meanwhile, the grid structure also has certain bearing capacity and integrity.
Drawings
FIG. 1 is a schematic view of a three-dimensional structure of the joint filling of circular cavity sections of the present application;
FIG. 2 is a schematic view of the cross-sectional structure A in FIG. 1 according to the present application;
FIG. 3 is a schematic view of a cross-sectional B-section of the middle layer of FIG. 1 where the middle layer of the erected bar is located;
FIG. 4 is a schematic view of a three-dimensional structure of the joint filling of rectangular cavity sections according to the present application;
FIG. 5 is a schematic view of the cross-sectional structure of FIG. 4 according to the present application;
FIG. 6 is a schematic view of a cross-sectional D-section of the middle layer stand bar of FIG. 4 according to the present application;
FIG. 7 is a schematic cross-sectional view of the antifreeze bar of the present application;
FIG. 8 is a schematic view of the outer surface structure of the frost-heaving resistant rod of the present application;
FIG. 9 is a schematic elevational view of an anti-frost-heaving sheet of the present application;
FIG. 10 is a schematic view of the sectional structure of the anti-frost-heaving board E-E of FIG. 9 according to the present application;
in the figure: 1. the broken stone filling material comprises 2 parts of an anti-frost-heave grid structure, 201 parts of a longitudinal bar, 202 parts of a transverse bar, 203 parts of a vertical bar, 3 parts of an anti-frost-heave bar, 301 parts of bar threads, 4 parts of an anti-frost-heave plate, 401 parts of a drain hole, 5 parts of a rubber material, 6 parts of a foam material, 7 parts of a reinforcing steel bar.
Detailed Description
The present application will be described in further detail with reference to examples and drawings. The specific examples are provided only for further detailed description of the present application and do not limit the scope of the application as claimed.
Example 1
A method for filling a cavity of an underground structure with a combination of rigid-flexible gratings and crushed stone (hereinafter referred to as filling method) mainly comprises the steps of filling the crushed stone filling material 1 and the anti-frost-heave grating structure 2 (see fig. 1-10). The frost heaving prevention grid structure 2 is formed by combining frost heaving prevention bars 3 and frost heaving prevention plates 4, wherein the frost heaving prevention bars 3 in the frost heaving prevention grid structure 2 are divided into longitudinal bars 201, transverse bars 202 and standing bars 203, the longitudinal bars 201 are vertically arranged along the height direction of the underground structure, the vertical expansion can be prevented, the longitudinal bars are arranged in a multi-ring mode of inner and outer nesting, and all the longitudinal bars on each ring are even in number and uniformly distributed, so that the whole stress is more uniform and symmetrical; adjacent two longitudinal bars on different circles are connected through a transverse bar 202, the transverse bar 202 passes through the center of the section through the extension line of the transverse bar or the transverse bar, and adjacent two longitudinal bars 201 on the same circle are connected through a standing bar 203. An frost-resistant expanded lattice structure 2 has at least one turn of erected bars 203, preferably 2-5 turns, with multiple turns of erected bars 203 nested inside and outside the center of the cross section, connected to each other by longitudinal bars 201 and transverse bars 202 to form a single unit. The frost heaving prevention plate 4 is in a zigzag shape, the frost heaving prevention plate 4 is arranged in the side surface surrounded by the frost heaving prevention bars 3 along the height direction of the underground structure, the inside of the frost heaving prevention plate 4 is filled with foam materials 6, and meanwhile, a drain hole 401 is formed. The frost heaving prevention bar 3 should be reliably connected with the frost heaving prevention plate 4.
Referring to fig. 2-3 and 5-6, the center of the cross section of the frost heaving prevention grid structure 2 should coincide with the center of the cross section of the cavity of the underground structure. The outer contour shape of the frost-heaving prevention grid structure 2 should be consistent with the cross-sectional shape of the cavity of the underground structure, and may be flexibly configured in a circular, rectangular (see fig. 1-4) or other cross-sectional type, but the cross-sectional size should be smaller than the cross-section of the cavity. The distance t between the outermost edge of the frost heaving prevention grating structure 2 and the edge of the crushed stone filling material 1 is preferably not less than 50mm.
Referring to fig. 2-3 and fig. 5-6, in each frost-heave prevention grid structure 2, the number of the standing bars 203 should be not less than 3, and the standing bars 203 are uniformly distributed on the frost-heave prevention grid structure 2 along the height direction, as shown in fig. 1, the number of the standing bars 203 is 3, and frost-heave prevention plates 4 are installed between two adjacent standing bars 203; the number of the longitudinal bars 201 on the same circle is even, the minimum number is 4, and the longitudinal bars should be uniformly and symmetrically arranged on the frost-heaving prevention grid structure 2.
Referring to fig. 7-8, the frost-heaving prevention bar 3 is composed of three parts, namely a rubber material 5, a foam material 6 and a reinforcing steel bar 7. The outer diameter d3 of the frost-heaving prevention bar 3 is larger than 12mm, preferably 15-20mm; the ratio of the outer diameter d2 of the foam material 6 to the outer diameter d3 of the frost-heaving prevention bar 3 should be not less than 1/4; the ratio of the outer diameter d1 of the reinforcing steel bars 7 to the outer diameter d3 of the frost-heaving prevention bar 3 should be 1/3-1/2. The steel bars 7 should preferably be selected to be two-stage ribbed steel bars, so as to ensure the bearing capacity of the frost heaving prevention grid structure 2, and ensure that the biting force of the steel bars makes the steel bars not easy to slip in the bars. Transverse bar 202 and erect bar 203 preferably have smaller outer diameters than longitudinal bar 201, while maintaining load bearing and reducing cost.
The rubber material 5 should ensure excellent expansion and contraction properties and have certain crack resistance, bending resistance and tensile strength. The foam material 6 should mainly be a high-density plastic foam. Referring to fig. 8, the spacing S between the threads 301 on the outer surface of the antifreeze bar 3 should be greater than the minimum diameter of the crushed stone and less than the maximum diameter of the crushed stone to achieve engagement with the crushed stone filler material.
Referring to fig. 9-10, the height h1, width b1 and spacing S1 of the saw teeth in the anti-frost-heave plate 4 are smaller than the maximum particle diameter of broken stone; where h1/b1 is preferably 1/3-1, b1=s1. The drain holes 401 should be arranged in a quincuncial pattern, and the drain hole diameter d4 should be larger than the minimum particle diameter of crushed stone, while d4/S1 is preferably 1/3-1/2. The filling section of the foam material 6 in the frost heaving prevention plate 4 is rectangular, and the distance between the filling section and the outer edge of the plate is preferably not less than 1/4 of the sawtooth width b1. The thickness t1 of the frost-heaving prevention plate 4 should not be greater than the outer diameter d3 of the frost-heaving prevention rod 3.
Referring to fig. 1 and 4, the height h of the anti-frost-swell grating structure 2 is preferably in the range of 30cm-50cm, and is comprehensively determined according to the height of the cavity, the grading, the grain size and the compactness of the crushed stone filling material, and the water collecting and draining functions of the underground structure; the crushed stone filling material 1 is filled in layers, and at least two circles of anti-freezing expansion grid structures 2 with mutually nested standing bars are arranged in the crushed stone filling material 1 within each height h range; when the cross section of the cavity is smaller, nesting design can be omitted, and frost heave grid structures with a circle of standing bars are filled in each layer of broken stone filling material; when the frost heaving force is large or the cross section of the cavity of the underground structure is large, the number and the diameter of the longitudinal bars 201 and the transverse bars 202 are increased, the cross section of the frost heaving prevention grid structure 2 is increased, the thickness of the frost heaving prevention plate 4 is increased, or the plurality of rings of erection bars 203 are nested, and the rings of erection bars 203, the transverse bars 202, the longitudinal bars 201 and the frost heaving prevention plate which are connected and installed with the rings of erection bars are reliably connected to form a whole.
The diameters or circumferences of the standing bars of different inner and outer rings are different, the inner and outer nesting is carried out within the range of the crushed stone filling material of the same height h, the height h in fig. 1 and 4 is the height of one layer of crushed stone filling material, and the layered filling of the crushed stone materials is layered according to the height on one hand, so that the bearing capacity and the rigidity of the grid structure are ensured, the effect of inhibiting frost heaving is ensured, and meanwhile, the damage is avoided; in order to facilitate the filling of broken stone in the cavity, on the other hand, specific design is required according to the type of the filled soil body in the cavity, and the realization of the existing functions of the underground structure is ensured.
The inner ring and the outer ring of the application can be in an inner-outer nested form consisting of a multi-ring rectangular structure, a multi-ring circular structure and the like.
The anti-freezing expansion grid structure 2 has certain flexibility and negative temperature transmission isolation effects, and the reinforcing steel bars 7 in the anti-freezing expansion grid structure ensure certain bearing capacity and durability; the frost heaving prevention grid structure 2 realizes a better meshing effect with the crushed stone filling material 1, so that the frost heaving prevention grid structure and the crushed stone filling material 1 can form a whole, coordinate stressed deformation, and can also effectively absorb frost heaving force of the crushed stone filling material 1 and prevent the frost heaving force from being transferred to the structure; the open pore design of the frost heaving prevention plate 4 ensures that the filling method does not influence the original water collecting and draining capability of the underground structure. The filling method is simple and feasible, has a simple and flexible internal structure, good integrity, low cost and excellent frost heaving prevention effect, does not influence the water collecting and draining performance of the underground structure, and has wide application prospect.
The application is applicable to the prior art where it is not described.
Claims (8)
1. A rigid-flexible grating and broken stone combined filling method for inhibiting frost heaving of a cavity of an underground structure is used for a hydraulically driven landslide, and is characterized in that broken stone filling materials and an frost heaving grating structure for inhibiting the frost heaving of the cavity of the underground structure are combined and filled in the cavity of the underground structure, and the outline shape of the frost heaving grating structure (2) is kept consistent according to the section shape of the cavity of the underground structure; the method is characterized in that:
the anti-frost-heave grid structure (2) comprises an anti-frost-heave bar (3) and an anti-frost-heave plate (4); the anti-freezing expansion bar (3) forms a supporting steel bar framework, a drainage hole corresponding to a drainage channel of an underground structure is formed in an anti-freezing expansion plate, the steel bar framework of the anti-freezing expansion bar is wrapped with a flexible deformation structure, the anti-freezing expansion plate is assembled along the outer surface of the longitudinal side wall of the anti-freezing expansion bar (3) along the height direction, the anti-freezing expansion bar and the anti-freezing expansion plate form an integrated structure, and the outer surfaces of the anti-freezing expansion bar and the anti-freezing expansion plate are both provided with structures meshed with broken stones or filled soil;
the anti-frost-heaving bar (3) is divided into longitudinal bars (201), transverse bars (202) and erection bars (203), the longitudinal bars (201) are vertically arranged along the height direction, a plurality of longitudinal bars are arranged in a multi-circle mode in an inner circle and an outer circle, the longitudinal bars on the same circle are uniformly distributed, two adjacent longitudinal bars on different circles are connected through the transverse bars, the transverse bars or extension lines thereof pass through the center of the cross section, the two adjacent longitudinal bars on the same circle are connected through the erection bars, and the longitudinal bars (201), the transverse bars (202) and the erection bars (203) form a space reinforcing steel skeleton structure; the anti-frost-heaving plate (4) is mainly made of rubber materials, is filled with foam materials (6) and is provided with drain holes (401); the frost heaving prevention bar (3) is reliably connected with the frost heaving prevention plate (4);
the anti-frost-heaving bar (3) consists of three parts, namely a rubber material (5), a foam material (6) and a reinforcing steel bar (7), which are sequentially arranged from outside to inside;
the drain holes (401) are arranged in a quincuncial shape, and the diameter d4 of the drain holes is larger than the minimum particle diameter of broken stones;
the frost heaving plate (4) is in a zigzag shape, the outer surface of the frost heaving bar is provided with threads, and the frost heaving plate is of a structure capable of being meshed with broken stone or filled soil, so that frost heaving force is transmitted to the frost heaving grid structure as much as possible, and the position of the frost heaving grid structure is ensured not to slide; the water collecting and draining performance of the structure can not be influenced by the filling method due to the arrangement of the water draining holes in the frost heaving prevention plate;
the underground structure with the cavity is applied to the region where seasonal frozen soil is located, and the broken stone filling material can ensure the water collecting and draining performance before freezing; however, once the air temperature is reduced, the soil body is frozen, the structure cannot continue to collect and drain water, because the structure has a good water collecting effect, the water content of the crushed stone filling material before freezing is large, the ground water collected in the crushed stone filling material after freezing is converted into ice, so that obvious frost heaving of the crushed stone filling material can occur, at the moment, the frost heaving force is directly transferred to the structure where the crushed stone filling material is located, the structure is cracked or even destroyed, and finally the water collecting and draining effect and the durability of the structure are seriously affected.
2. Filling method according to claim 1, characterized in that the outer diameter d3 of the frost-heaving prevention rod (3) is greater than 12mm; the steel bar (7) is ribbed steel bar, and the outer surface of the rubber material is also provided with a thread structure.
3. Filling method according to claim 1, characterized in that the ratio of the outer diameter d2 of the foam material (6) to the outer diameter d3 of the frost-heaving rod (3) is not less than 1/4; the ratio of the outer diameter d1 of the reinforcing steel bar (7) to the outer diameter d3 of the frost-proof bar (3) is 1/3-1/2.
4. The joint filling method according to claim 1, wherein: the center of the cross section of the anti-freezing expansion grid structure (2) coincides with the center of the cross section of the cavity of the underground structure; the distance t between the frost heaving prevention grid structure (2) and the edge of the broken stone filling material (1) is not less than 150mm.
5. The joint filling method according to claim 1, wherein: in each frost-proof expansion grid structure (2), the frost-proof expansion bars (3) are divided into longitudinal bars (201), transverse bars (202) and erection bars (203), wherein the number of layers of the erection bars (203) is not less than 3, and the rods are uniformly distributed in the frost-proof expansion grid structures (2) along the height direction; the number of the longitudinal bars (201) is even, the minimum number is 4, and the longitudinal bars are uniformly and symmetrically arranged on the frost heaving prevention grid structure (2).
6. The joint filling method according to claim 1, wherein: the space S between the threads (301) on the outer surface of the anti-freezing bar (3) is larger than the minimum particle diameter of broken stone and smaller than the maximum particle diameter of broken stone; the sawtooth height h1, the sawtooth width b1, the sawtooth spacing S1 and the board thickness t1 of the anti-frost-heave board (4) are all smaller than the maximum particle diameter of broken stone; wherein h1/b1 is 1/3-1, b1=s1; the filling section of the foam material (6) in the anti-frost-heave plate (4) is rectangular, and the distance between the outer edge of the filling section and the outer edge of the plate is not less than 1/4 of the sawtooth width b1; the thickness t1 of the frost-heaving prevention plate (4) is not more than the outer diameter d3 of the frost-heaving prevention bar material 3;
the diameter d4 of the drain hole simultaneously satisfies: d4/S1 is 1/3-1/2.
7. The joint filling method according to claim 1, wherein: the height h of the frost heaving prevention grid structure (2) ranges from 30cm to 50cm, and is comprehensively determined according to the height of the cavity, the grading, the grain diameter and the compactness of the crushed stone filling material (1) and the water collecting and draining functions of the underground structure; the broken stone filling materials (1) are filled in layers, and each layer of broken stone filling material (1) is internally provided with at least two rings of anti-freezing expansion grid structures (2) with mutually nested vertical bars; when the cross section of the cavity is smaller, each layer of broken stone filling material is filled with a frost heave grid structure with a circle of standing bars; when frost heaving force is large or the cross section of the underground structure cavity is large, the number and the diameter of the longitudinal bars (201) and the transverse bars (202) are increased, the cross section of the frost heaving grating structure (2) is increased, the thickness of the frost heaving plates (4) is increased, or the plurality of rings of erection bars (203) are nested, and each ring of erection bars (203) and the transverse bars, the longitudinal bars and the frost heaving plates connected and installed with the rods are reliably connected to form a whole.
8. The joint filling method according to claim 1, wherein: the plurality of frost-proof expansion grid structures (2) are independently arranged along the height direction of the underground structure cavity, and once the frost-proof expansion grid structure in a certain height range is damaged, the frost-proof expansion effect at other positions is not affected; the method is suitable for underground structures with gravel filling, cavities, water collecting and draining functions and other types of soil filling, wherein the other types of soil comprises a fine sand layer and a medium-coarse sand layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111575736.8A CN114197541B (en) | 2021-12-22 | 2021-12-22 | Rigid-flexible grating and broken stone combined filling method for inhibiting frost heaving of underground structure cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111575736.8A CN114197541B (en) | 2021-12-22 | 2021-12-22 | Rigid-flexible grating and broken stone combined filling method for inhibiting frost heaving of underground structure cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114197541A CN114197541A (en) | 2022-03-18 |
| CN114197541B true CN114197541B (en) | 2023-09-22 |
Family
ID=80655816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111575736.8A Active CN114197541B (en) | 2021-12-22 | 2021-12-22 | Rigid-flexible grating and broken stone combined filling method for inhibiting frost heaving of underground structure cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114197541B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0768432A1 (en) * | 1995-10-13 | 1997-04-16 | Chantal Boissie | Drainage system and method for earth and walls using a granular material |
| CN102465524A (en) * | 2010-11-11 | 2012-05-23 | 上海市政工程设计研究总院 | Double radial mesh-cage sand-gravel pile and construction process thereof |
| CN108240002A (en) * | 2018-01-31 | 2018-07-03 | 长沙理工大学 | A kind of foundation pile defroster and method |
| CN112144477A (en) * | 2020-09-25 | 2020-12-29 | 水利部交通运输部国家能源局南京水利科学研究院 | Intelligent phase change capsule geomembrane for preventing lining from being frozen and expanded and damaged |
-
2021
- 2021-12-22 CN CN202111575736.8A patent/CN114197541B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0768432A1 (en) * | 1995-10-13 | 1997-04-16 | Chantal Boissie | Drainage system and method for earth and walls using a granular material |
| CN102465524A (en) * | 2010-11-11 | 2012-05-23 | 上海市政工程设计研究总院 | Double radial mesh-cage sand-gravel pile and construction process thereof |
| CN108240002A (en) * | 2018-01-31 | 2018-07-03 | 长沙理工大学 | A kind of foundation pile defroster and method |
| CN112144477A (en) * | 2020-09-25 | 2020-12-29 | 水利部交通运输部国家能源局南京水利科学研究院 | Intelligent phase change capsule geomembrane for preventing lining from being frozen and expanded and damaged |
Non-Patent Citations (1)
| Title |
|---|
| 张军辉.《路基路面工程》.机械工业出版社,2021,第400页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114197541A (en) | 2022-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103526770B (en) | A kind of construction method of high antiseepage anti-floating pile raft structure | |
| RU2579090C2 (en) | Innovative seamless geogrid mesh structure for soil reinforcement, method and storage for its reception | |
| CN102011394B (en) | Method for reinforcing aeolian sandy soil by polypropylene fibers | |
| CN102134848B (en) | Extruding and extending device for horizontal loading, drainage and solidifying, soft soil reinforcement and construction method thereof | |
| CN109653049B (en) | Construction method for processing bridge head filling road section on soft foundation | |
| CN102002917A (en) | Method for preparing stone blocking dam by using waste and old rubber | |
| CN103628583A (en) | Assembled type movable blast wall | |
| CN110670433A (en) | Construction structure for constructing road on soft soil foundation | |
| Kovalchuk et al. | Study of the stress-strain state in defective railway reinforced-concrete pipes restored with corrugated metal structures | |
| CN112195836A (en) | Foam concrete filled pyramid type three-dimensional lattice sandwich structure pier anti-collision device | |
| CN203594041U (en) | Piled raft structure with good resistance to seepage and buoyancy | |
| CN114197541B (en) | Rigid-flexible grating and broken stone combined filling method for inhibiting frost heaving of underground structure cavity | |
| CN209873479U (en) | Bridgehead filling embankment structure on soft foundation | |
| CN116220749B (en) | A prevent accuse structure for rock burst tunnel | |
| CN101781897A (en) | Anchor plate reinforced gabion retaining wall and construction method thereof | |
| CN202865803U (en) | Check dam | |
| CN110656605A (en) | UHPFRC assembled road protection wall and construction method | |
| RU149258U1 (en) | COMBINED WALL FROM PLAIN PILES | |
| CN104947608A (en) | Steel corrugated plate arch culvert reinforced by steel frames | |
| CN102518086A (en) | Soil-retaining dam and construction method thereof | |
| CN214530265U (en) | Take steel ripple culvert pipe structure of EPS offloading board | |
| CN212582461U (en) | Steel corrugated pipe culvert structure for preventing pavement from cracking in high and cold frozen soil areas | |
| CN205171457U (en) | A mask block structure for resisting wave | |
| CN110714468B (en) | High-fill tunnel open cut tunnel load-reducing structure | |
| WO2015190417A1 (en) | Retaining wall structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |