CN104314088B - Seasonal frozen soil region self-temperature-regulating return power consumption slope body supporting and protection structure and construction method - Google Patents
Seasonal frozen soil region self-temperature-regulating return power consumption slope body supporting and protection structure and construction method Download PDFInfo
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- CN104314088B CN104314088B CN201410618405.1A CN201410618405A CN104314088B CN 104314088 B CN104314088 B CN 104314088B CN 201410618405 A CN201410618405 A CN 201410618405A CN 104314088 B CN104314088 B CN 104314088B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/202—Securing of slopes or inclines with flexible securing means
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- 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
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0084—Geogrids
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
Seasonal frozen soil region self-temperature-regulating return power consumption slope body supporting and protection structure and construction method, belong to seasonal frozen ground Shotcrete Rockbolt Support Technique field.Structure comprises lattice beam, anchor pole, spring and insulation construction; It is characterized in that: in the body of slope, squeeze into anchor pole, and pressure injects anchoring slurry by anchor rod anchored in steady soil, outwards insulation construction and geo-grid is laid successively from domatic, and spray furnace surface layer, apply lattice beam on domatic, anchor pole is through the crossover sites of lattice beam, anchor pole overlaps upper padding plate and spring successively, with ground tackle by anchor rod anchored on lattice beam, along domatic transverse direction, vertical drainage passage is set at a certain distance, top, slope arranges catchwater, and toe arranges escape canal; Structure of the present invention has self-regulated thermal insulation, subtracts swollen damping and from return supporting performance, can comb draining in time and divide, and efficiently solves the slope body unstability that frozen swell and melt settlement disaster causes.The inventive method is simple, and feasibility is strong, and quick construction is cheap.
Description
Technical field
The present invention relates to a kind of seasonal frozen soil region self-temperature-regulating return power consumption slope body supporting and protection structure and construction method, belong to seasonal frozen ground Shotcrete Rockbolt Support Technique field, be specially adapted to seasonal frozen soil region side slope, foundation pit supporting project.
Background technology
Seasonal frozen ground refers to the soil layer freezing winter to melt spring.Seasonal frozen ground accounts for 55% of China's area, and mountain region accounts for 67% of area.Therefore China is seasonal frozen ground big country and mountain region big country.This objectively determines and emerge a large amount of seasonal frozen ground side slope in the engineering construction such as China traffic route, water conservancy.In addition, current city building land is very in short supply, and many engineering constructions all need excavation pit, and is subject to the impact of on-stream time and speed of application, has base pit engineering to need to experience winter and spring unavoidably.Nowadays the support engineering such as side slope and foundation ditch application the most generally Shotcrete Rockbolt Support Technique.A large amount of engineering practices shows, the side slope of building in frozen ground regions and foundation ditch, and the engineering accident that experience to be melted and cause frost heave spring in winter is innumerable.Analysis reason shows: the moisture in the soil body is in the winter time by the impact of low temperature, and the water that temperature is higher shifts to the soil layer direction that temperature is lower, and under the effect of temperature difference polywater, moisture is assembled rapidly and formed poly-ice sheet gradually; Water freezes rear volume expansion and produces frost heave, and gently then bolt-spary supports surface layer breaks, heavy then cause anchor pole to be broken or lattice beam destroy.When spring temperature gos up, after frozen soil melts, water content of soil increases, and intensity reduces, and causes slope texture to decline even unstability.Through season, freeze thawing test finds, the major defect of existing Frozen Area Shotcrete Rockbolt Support Technique is: (1) does not consider thermal insulation substantially, even if part engineering considers thermal insulation, due to traditional material can only single thermal resistance, heat capacity low, be easily torn, heat waste is large, sensible heat storage power is little, and supporting and protection structure thermal-insulation construction technique imperfection, cause not reaching engineering control object; (2) frost heave makes slope body and the displacement of supporting and protection structure generating portion, and during thaw collapse, anchor pole exists permanent set, causes the constraint of supporting and protection structure to slope body to weaken.The slope body unstability that both defects cause bolt-spary supports structure that freeze thawing can not be avoided to cause.
Phase-change material refers to that material itself varies with temperature and changes states of matter and can provide latent heat, and keeps the metastable material of temperature in the process.This material can heat (cold) amount of absorbing environmental in states of matter change procedure, and releases heat (cold) amount to environment when needed, has and controls the good characteristic of ambient temperature, be therefore subject to the favor of engineer.At present with it for carrier has made all kinds of constructional materials, exterior-wall heat insulation, floor insulation etc. as house are used widely, and achieve good engineering effort.
Summary of the invention
The object of the present invention is to provide a kind of seasonal frozen soil region self-temperature-regulating return power consumption slope body supporting and protection structure and construction method, this structure has thermal insulation, subtract swollen damping and from return supporting performance, slope, current seasonal frozen soil region body supporting and protection structure can be made up, effectively can not prevent and treat the slope body unstability that the disaster such as body frost heaving, thaw collapse causes.
The present invention is seasonal frozen soil region self-temperature-regulating return power consumption slope body supporting and protection structure and construction method, self-temperature-regulating return power consumption slope, seasonal frozen soil region body supporting and protection structure, comprise lattice beam 1, anchor pole 2, spring 5 and insulation construction, anchor pole 2 is squeezed in the body of slope, and anchor pole 2 is anchored in steady soil by pressure injection anchoring slurry 3, outwards insulation construction and geo-grid 10 is laid successively from domatic, and spray furnace surface layer 11, lattice beam 1 is applied on domatic, anchor pole 2 is through the crossover sites of lattice beam 1, anchor pole 2 overlaps upper padding plate 4 and spring 5 successively, with ground tackle 6, anchor pole 2 is anchored on lattice beam 1, along domatic transverse direction, vertical drainage passage 12 is set at a certain distance, top, slope arranges catchwater 13, toe arranges escape canal 14.
The construction method of self-temperature-regulating return power consumption slope, seasonal frozen soil region body supporting and protection structure, its construction sequence is:
Secondly (1) unwrapping wire and location: first carry out unwrapping wire according to engineering design measuring apparatus, excavation slope or foundation ditch, revise and domaticly make it smooth, arranges position with measuring apparatus location anchor pole 2 and vertical drainage passage 12;
(2) construction anchor pole 2: by Engineering anchor rod 2 design angle, offer hole in the body of slope, anchor pole 2 is placed in hole, and inject anchoring slurry 3;
(3) lay insulation construction and geo-grid 10: outwards lay protection cushion coat 7, phase-change heat-preserving board 8, heat preservation protective layer 9 and geo-grid 10 successively from domatic, and make insulation construction and geo-grid 10 through anchor pole 2;
(4) spray surface layer 11 and apply lattice beam 1: spray furnace in geo-grid 10 on domatic; Apply horizontal, vertical lattice beam 1, and horizontal, vertical crossover sites is through anchor pole 2;
(5) arrange spring 5 and anchoring rod 2: on anchor pole 2, overlap upper padding plate 4 and spring 5 successively, treat that lattice beam 1 reaches some strength, pre-stretch-draw is carried out to anchor pole 2, and with ground tackle 6, anchor pole 2 is anchored on lattice beam 1;
(6) by the stretch-draw grappling of the anchor pole 2 of the next work plane of the sequence construction of step (2) ~ (5), insulation construction, geo-grid 10, lattice beam 1, surface layer 11 and anchor pole 2 until slope is low;
(7) construction vertical drainage passage 12: form a mask after completing steps (1) ~ (6) operation, arrange PVC plastic pipe or steel concrete gutter in the side of a mask;
(8) catchwater 13 and escape canal 14 is applied: arrange position completing the top, slope of mask and the corresponding catchwater 13 of toe and escape canal 14, be equipped with protection cushion coat 7, phase-change heat-preserving board 8 and heat preservation protective layer 9 from top to bottom, then concreting forms catchwater 13 and escape canal 14;
(9) repeat above step (1) ~ (8), the adjacent next one of constructing props up mask and drainage system.
The invention has the beneficial effects as follows: the principle of the invention is simple, and practical, cheap, construction technology is easy, solves the unstability of the bolt-spary supports structure slope body that frozen swell and melt settlement causes.When the phase transition temperature of ambient temperature higher than phase-change heat-preserving board, phase-change heat-preserving board absorbs heat, and is stored in phase-change material.When the phase transition temperature of ambient temperature lower than phase-change heat-preserving board, the heat of storage discharges with latent heat form by phase-change material, heat is provided to slope body, alleviate slope temperature sharply decline and cause the frost heave that moisture freezes, reduce slope body and freeze layer and the non-temperature difference of freezing between layer, delay the non-layer soil body moisture that freezes to the speed of freezing layer migration; Effectively alleviate frost heave, warm season thaw collapse is controlled simultaneously.Protection cushion coat and heat preservation protective layer can shield to phase-change heat-preserving board, can be incubated again to slope body, reduce thermal loss, can also play the effect of earthquake isolation to supporting and protection structure; Spring, by regulating self-deformation, can alleviate the destruction of body frost heaving to supporting and protection structure, supporting and protection structure can be allowed again when soil body thaw collapse to return to the position of the close soil body immediately, play bracing effect, can also alleviate the effect of earthquake to supporting and protection structure; Geo-grid, as armour layer, can save amount of reinforcement in existing supporting and protection structure technology, reduces construction costs; Catchwater can reduce moisture and enter slope body, and escape canal can be combed draining in time and divide, and alleviates extra water and enters slope body and produce frost heave.
Accompanying drawing explanation
Fig. 1 is the elevational schematic view of supporting and protection structure provided by the present invention; Fig. 2 is the generalized section of supporting and protection structure provided by the present invention; Fig. 3 is A drawing in Fig. 2 of the present invention, description of reference numerals: lattice beam 1, anchor pole 2, anchoring slurry 3, backing plate 4, spring 5, ground tackle 6, protection cushion coat 7, phase-change heat-preserving board 8, heat preservation protective layer 9, geo-grid 10, surface layer 11, vertical drainage passage 12, catchwater 13, escape canal 14.
Detailed description of the invention
For understanding content of the present invention, feature and effect further, be described in detail as follows below in conjunction with example and accompanying drawing:
As Fig. 1, 2, shown in 3, self-temperature-regulating return power consumption slope, seasonal frozen soil region body supporting and protection structure, comprise lattice beam 1, anchor pole 2, spring 5 and insulation construction, anchor pole 2 is squeezed in the body of slope, and anchor pole 2 is anchored in steady soil by pressure injection anchoring slurry 3, outwards insulation construction and geo-grid 10 is laid successively from domatic, and spray furnace surface layer 11, lattice beam 1 is applied on domatic, anchor pole 2 is through the crossover sites of lattice beam 1, anchor pole 2 overlaps upper padding plate 4 and spring 5 successively, with ground tackle 6, anchor pole 2 is anchored on lattice beam 1, along domatic transverse direction, vertical drainage passage 12 is set at a certain distance, top, slope arranges catchwater 13, toe arranges escape canal 14.
As shown in Figure 1, 2, lattice beam 1 adopts steel concrete in permanent works, adopts channel-section steel or i iron in temporary works.
As shown in Figure 1, 2, anchor pole 2 is anchor metal, or non-metallic rock, or flexible roof bolt, or fiber anchor rod, or Composite Bolt.
As shown in Figure 2, spring 5 stiffness factor is: 200 ~ 600N/mm, and diameter value is between anchor pole and ground tackle external diameter, and length is 60 ~ 120mm.
As shown in Figure 2,3, insulation construction is three layers, is made up of domatic protection cushion coat 7, phase-change heat-preserving board 8 and the heat preservation protective layer 9 outwards laid successively.
As shown in Figure 2,3, phase-change heat-preserving board 8 is with inorganic-phase variable energy storage porous media for carrier, and store phase-change material in hole, porous media external surface macromolecule polymer material film wraps up.Critical-temperature 0 DEG C is freezed according to soil body moisture, the phase-change material of phase transition temperature between-10 DEG C ~ 0 DEG C all can be selected for the present invention, phase-change material such as potassium nitrate, sodium fluoride, sodium carbonate class store up cold eutectic mixture, mica, one or more combinations in TH-4 alkanes.
As shown in Figure 2,3, protection cushion coat 7 and heat preservation protective layer 9 are rubber and plastic cotton, or plastic foamboard, or glass wool board, or extruded sheet, or expansion polyphenyl plate.
As shown in Figure 1,3, geo-grid 10 is plastics, or terylene, or glass fiber, or composite material.
As shown in Figure 1, vertical drainage passage (12) is dark 30 ~ 50cm, and the steel concrete rhone of the wide 20 ~ 40cm of being or diameter 15 ~ 30cm are PE, PVC plastic pipe.Distance between vertical drainage passage (12) is between 60 ~ 80m, i.e. the width of a work plane.
As shown in Figure 1, 2, catchwater 13 and escape canal 14 form for concreting, and bottom surface is equipped with protection cushion coat 7, phase-change heat-preserving board 8 and heat preservation protective layer 9 from top to bottom.The degree of depth of catchwater 13 and escape canal 14 is 20 ~ 50cm, and width is 30 ~ 50cm.
When the present invention constructs, should contrary sequence method be adopted, section construction, namely from top to bottom successively, section construction, the steps include:
Secondly (1) unwrapping wire and location: first carry out unwrapping wire according to engineering design measuring apparatus, excavation slope or foundation ditch, revise and domaticly make it smooth, arranges position with measuring apparatus location anchor pole 2 and vertical drainage passage 12;
(2) construction anchor pole 2: by Engineering anchor rod 2 design angle, offer hole in the body of slope, anchor pole 2 is placed in hole, and inject anchoring slurry 3;
(3) lay insulation construction and geo-grid 10: outwards lay protection cushion coat 7, phase-change heat-preserving board 8, heat preservation protective layer 9 and geo-grid 10 successively from domatic, and make insulation construction and geo-grid 10 through anchor pole 2;
(4) spray surface layer 11 and apply lattice beam 1: spray furnace in geo-grid 10 on domatic; Apply horizontal, vertical lattice beam 1, and horizontal, vertical crossover sites is through anchor pole 2;
(5) arrange spring 5 and anchoring rod 2: on anchor pole 2, overlap upper padding plate 4 and spring 5 successively, treat that lattice beam 1 reaches some strength, pre-stretch-draw is carried out to anchor pole 2, and with ground tackle 6, anchor pole 2 is anchored on lattice beam 1;
(6) by the stretch-draw grappling of the anchor pole 2 of the next work plane of the sequence construction of step (2) ~ (5), insulation construction, geo-grid 10, lattice beam 1, surface layer 11 and anchor pole 2 until slope is low;
(7) construction vertical drainage passage 12: form a mask after completing steps (1) ~ (6) operation, arrange PVC plastic pipe or steel concrete gutter in the side of a mask;
(8) catchwater 13 and escape canal 14 is applied: arrange position completing the top, slope of mask and the corresponding catchwater 13 of toe and escape canal 14, be equipped with protection cushion coat 7, phase-change heat-preserving board 8 and heat preservation protective layer 9 from top to bottom, then concreting forms catchwater 13 and escape canal 14;
(9) repeat above step (1) ~ (8), the adjacent next one of constructing props up mask and drainage system.
Claims (7)
1. seasonal frozen soil region self-temperature-regulating return power consumption slope body supporting and protection structure, comprise lattice beam (1), anchor pole (2), spring (5) and insulation construction, it is characterized in that: in the body of slope, squeeze into anchor pole (2), and anchor pole (2) is anchored in steady soil by pressure injection anchoring slurry (3), outwards insulation construction and geo-grid (10) is laid successively from domatic, and spray furnace surface layer (11), lattice beam (1) is applied on domatic, anchor pole (2) is through the crossover sites of lattice beam (1), anchor pole (2) overlaps upper padding plate (4) and spring (5) successively, with ground tackle (6), anchor pole (2) is anchored on lattice beam (1), along domatic transverse direction, vertical drainage passage (12) is set at a certain distance, top, slope arranges catchwater (13), toe arranges escape canal (14), insulation construction is formed by protecting cushion coat (7), phase-change heat-preserving board (8) and heat preservation protective layer (9), phase-change heat-preserving board (8) is for carrier with inorganic-phase variable energy storage porous media, phase-change material is stored in hole, porous media external surface macromolecule polymer material film parcel, phase-change material is the phase-change material of phase transition temperature between-10 DEG C ~ 0 DEG C.
2. seasonal frozen soil region according to claim 1 self-temperature-regulating return power consumption slope body supporting and protection structure, it is characterized in that: described anchor pole (2) is anchor metal, or is non-metallic rock, or is flexible roof bolt, or be fiber anchor rod, or be Composite Bolt.
3. seasonal frozen soil region according to claim 1 self-temperature-regulating return power consumption slope body supporting and protection structure, it is characterized in that: described spring (5) stiffness factor is: 200 ~ 600N/mm, diameter value is between anchor pole and ground tackle external diameter, and length is 60 ~ 120mm.
4. seasonal frozen soil region according to claim 1 self-temperature-regulating return power consumption slope body supporting and protection structure; it is characterized in that: described protection cushion coat (7) and heat preservation protective layer (9) are rubber and plastic cotton; or be plastic foamboard; or be glass wool board; or be extruded sheet, or be expansion polyphenyl plate.
5. seasonal frozen soil region according to claim 1 self-temperature-regulating return power consumption slope body supporting and protection structure, it is characterized in that: described vertical drainage passage (12) is dark 30 ~ 50cm, the steel concrete rhone of the wide 20 ~ 40cm of being or diameter 15 ~ 30cm are PE, PVC plastic pipe; Distance between vertical drainage passage (12) is between 60 ~ 80m.
6. seasonal frozen soil region according to claim 1 self-temperature-regulating return power consumption slope body supporting and protection structure, it is characterized in that: described catchwater (13) and escape canal (14) form for concreting, and bottom surface is equipped with protection cushion coat (7), phase-change heat-preserving board (8) and heat preservation protective layer (9) from top to bottom; The degree of depth of catchwater (13) and escape canal (14) is 20 ~ 50cm, and width is 30 ~ 50cm.
7. the construction method of seasonal frozen soil region self-temperature-regulating return power consumption slope body supporting and protection structure, it is characterized in that, its construction sequence is:
Secondly (1) unwrapping wire and location: first carry out unwrapping wire according to engineering design measuring apparatus, excavation slope or foundation ditch, revise and domaticly make it smooth, and that locates anchor pole (2) and vertical drainage passage (12) with measuring apparatus arranges position;
(2) construction anchor pole (2): by Engineering anchor rod (2) design angle, offer hole in the body of slope, anchor pole (2) is placed in hole, and inject anchoring slurry (3);
(3) insulation construction and geo-grid (10) is laid: outwards lay protection cushion coat (7), phase-change heat-preserving board (8), heat preservation protective layer (9) and geo-grid (10) successively from domatic, and make insulation construction and geo-grid (10) through anchor pole (2);
(4) surface layer (11) and apply lattice beam (1) is sprayed: geo-grid (10) goes up spray furnace on domatic; Apply horizontal, vertical lattice beam (1), and horizontal, vertical crossover sites is through anchor pole (2);
(5) spring (5) and anchoring rod (2) is arranged: on anchor pole (2), overlap upper padding plate (4) and spring (5) successively, treat that lattice beam (1) reaches some strength, pre-stretch-draw is carried out to anchor pole (2), and with ground tackle (6), anchor pole (2) is anchored on lattice beam (1);
(6) by the stretch-draw grappling of the anchor pole (2) of the next work plane of the sequence construction of step (2) ~ (5), insulation construction, geo-grid (10), lattice beam (1), surface layer (11) and anchor pole (2) until slope is low;
(7) construction vertical drainage passage (12): form a mask after completing steps (1) ~ (6) operation, arranges PVC plastic pipe or steel concrete gutter in the side of a mask;
(8) catchwater (13) and escape canal (14) is applied: arrange position completing the top, slope of mask and the corresponding catchwater of toe (13) and escape canal (14), be equipped with protection cushion coat (7), phase-change heat-preserving board (8) and heat preservation protective layer (9) from top to bottom, then concreting forms catchwater (13) and escape canal (14);
(9) repeat above step (1) ~ (8), the adjacent next one of constructing props up mask and drainage system.
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