CN107859041B - The construction method of collapsible loess zanjon high roadbed structure - Google Patents
The construction method of collapsible loess zanjon high roadbed structure Download PDFInfo
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- CN107859041B CN107859041B CN201710850897.0A CN201710850897A CN107859041B CN 107859041 B CN107859041 B CN 107859041B CN 201710850897 A CN201710850897 A CN 201710850897A CN 107859041 B CN107859041 B CN 107859041B
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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
- E02D17/18—Making embankments, e.g. dikes, dams
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Abstract
The present invention relates to a kind of construction methods of collapsible loess zanjon high roadbed structure, mainly comprising steps of after underfilling, it excavates hand excavation's slot and assembled humidification groove is set and carry out controlling water filling humidification, it stands hammer ram after dissipating and uniformly puts rammer, side slope bench excavation is carried out after ramming eventually and fills the water humidification, after layering is successively constructed, the element earth pile reinforcement of side slope juncture area.Construction method of the invention, can promote filler humidification uniformly, improve low-water-content collapsible loess intensity, reduce layer compression, improve uniformity, reduce uneven settlement of foundation.
Description
Technical field
The present invention relates to foundation treatment technology fields, refer specifically to the construction method of collapsible loess high roadbed structure.
Background technique
Collapsible loess is a kind of soil of special nature, and soil property is more uniform, short texture, pores'growth.Not by water
When soaking, common intensity is higher, and compressibility is smaller.When by water-soaked, soil structure can be destroyed rapidly under a certain pressure, generate compared with
Big additional sinking, intensity reduce rapidly.Therefore built on Site of Collapsible Loess, should according to the importance of building,
Base is taken by the size and the Stringency that is limited differential settlement during use of water-soaked possibility and is with basement process
Main aggregate measures prevent damp sink of foundation from generating harm to building.
The purpose of collapsible loess foundation processing is mainly to pass through the collapsibility for eliminating loess, improves the bearing capacity of ground.
Common method for processing foundation has: ground layer of soil or mixed lime and soil, native stake or lime soil pile, heavy-tamping method, heavy tamping method, pile foundation, preimpregnation
Water law etc..In recent years, heavy-tamping method with its Ground Treatment easy construction, speed is fast, effect is good, low cost the advantages that, in the whole nation
It is used widely and promotes in Collapsible Loess District.But traditional heavy-tamping method still has deficiency: native soil layer and compacting are native and each
Region intersection is easy to produce construction joint, forms the weak band of compacting；Collapsible loess upper and lower level is humidified uneven etc..
Summary of the invention
The purpose of the present invention is to solve the deficiency of the above background technology, provides a kind of collapsible loess zanjon high roadbed
The construction method of structure, back-filling in layers strong rammer improve deep backfill soil mass property, and overlap joint step, element earth pile can be effective
Solve the problems, such as that overlap joint range soil layer weakness, assembled humidification groove improve the uniformity of soil layer moisture content.
In order to achieve the above technical purposes, the invention adopts the following technical scheme:
The construction method of collapsible loess zanjon high roadbed structure, it is characterised in that the collapsible loess zanjon high roadbed
Structure mainly includes that compaction in layers native (3), element earth pile (4), hand excavation's slot (5), assembled humidification groove, top layer roll
Soil layer (8) and water blocking body (6)；Compaction in layers soil borderline region setting element earth pile (4) and step excavation (2), layering
Tamping native (3) top is compacting layer (10), and compacting layer top is that top layer rolls soil layer (8)；Assembly is provided in hand excavation's slot
Formula humidification groove；The assembled humidification groove mainly includes U-shaped steel board slot (11), vertical drainage pipe with holes (15) and pile top with holes
(17)；Setting overlap joint tongue and groove (19) and connection floor (23) before and after U-shaped steel board slot (11) with holes, top is provided with water injection hole
(14) vertical drainage pipe (15) with holes and pile top (17) is arranged in retractable cover board (20), bottom；
The construction method mainly comprises the steps that
Step 1: zanjon garbage disposal, within the scope of embankment, ground surface layer fertile soil, surface soil, turf clear up；Row
Except excess surface water；Making temporary road；
Step 2: hole bottom site clearing is smooth, construction area is divided, ram preceding smooth height with level measurement and is remembered
The position for carrying out the measurement of control axis and marking point is arranged in record according to point；
Step 3: layering filler, loosened soil utilizes GPS to have point absolute altitude in each region mark post according to on-site before being laid with
Laying depth is marked, repetition measurement is carried out with level after the completion of laying, carries out field control watering after filler；
Step 4: excavating hand excavation's slot (5) using mini-excavator, side grade is with assembled humidification slot structure
It is quasi-；The assembled humidification groove mainly includes U-shaped steel board slot (11), vertical drainage pipe with holes (15) and pile top (17) with holes；Band
Setting overlap joint tongue and groove (19) and floor (23) are connected before and after hole U-shaped steel board slot (11), and what top was provided with water injection hole (14) can
It opens and closes cover board (20), vertical drainage pipe (15) with holes and pile top (17) is arranged in bottom；
Step 5: installation assembled humidification groove, carries out water filling humidification by control standard of optimum moisture content, stands after water filling
It dissipates 3~5 days；Then assembled humidification groove is hung, filler surface feed supplement leveling；
Number is rammed Step 6: first determining according to depth of packing, hammer ram parameter, practical ramming times control last two is hit
Hole absolute altitude is hit to be not much different in 50mm；Hammer ram uniformly puts rammer；If it was found that when causing hammer ram skew because cheating slanted floor, should in time by
Cheat bottom leveling；When tamping pit is too deep, it is difficult body hammer occurs, but without obvious protuberance, and control standard has not yet been reached, tamping pit is backfilled
After pushing up concordantly to hole, continue to ram；Tamping pit is filled and led up with bull-dozer after ramming eventually, and measures site elevation；
Step 7: side slope bench excavation, the slope surface that the embankment layer of every layer of strong rammer layer intersects with native soil layer is extended out, and makes embankment layer
1:1 step is formed with native soil layer；Side slope water filling humidification is carried out later；
Step 8: after successively above-mentioned construction procedure is completed in layering, top sheep-foot roller pressure, top layer backfill the earthwork with a thickness of
400mm, extending out 400mm makes embankment layer and native soil layer form 1:1 step, is rolled 8 times later with loading machine cleaning is smooth；
Step 9: side slope juncture area long-spiral drilling machine soil taking hole forming, element earth pile construction is carried out after pore-forming, then clearly
Except top loosens layer, decking and rolling to designed elevation；
Step 10: pile body and inter-pile soil detect soil layer, its compacting factor is detected with cutting ring manual sampling.
Further, the compaction in layers native (3) is layering filling tamped structure, every layer of 3~6m of reinforcement depth；Every layer of void
Native laying depth has more about 0.5m than practical compacted thickness, specifically rams effect by hammer ram parameter and practical examination and determines；Tamping point spacing
It is 2.5 times of hammer ram diameter, tamping point is arranged by blossom type, and the tamping point of upper and lower two backfills layer should be staggeredly arranged, so that upper and lower two
Layer to ram cylinder mutually ratcheting；Ramming times control is not much different for the hole absolute altitude that hits that last two hit in the total degree of 50mm.
The step excavation (2) is used to reinforce native soil layer and tamps the compacting weakness of layer intersection and each region intersection
Band extends out 1:1 step in the slope surface that every layer of embankment layer intersects with native soil layer, and extending out width is this layer of Depth of filled soil.
The element earth pile (4) is used for slope soil reinforcement, is set to compaction in layers soil boundary, stake diameter about 400mm,
Blossom type arrangement is pressed in the long 12~20m of stake, stake spacing 1000, campshed spacing 866mm, stake.
Hand excavation's slot (5) is excavated on every layer of filler.For reaching the place of requirement absolute altitude after backfill leveling, adopt
It is carried out excavating hand excavation's slot (5) with mini-excavator, spacing 4000mm, fluting bottom width is 800mm, and groove depth is
600-800mm, side form certain slope, and box cut is for installing assembled humidification groove.
The water blocking body (6) is steel plate or concrete structure, and water outflows when for preventing soil layer to be humidified.
The top layer rolls the form of construction work that soil layer (8) use sheep-foot roller pressure, backfills the earthwork with a thickness of 400mm, sheep-foot roller
Pressurized layer extends out 400mm, and embankment layer and native soil layer is made to form 1:1 step, is rolled 8 times later with loading machine cleaning is smooth.
The assembled humidification groove can be prefabricated in the factory, the uniformity for increasing soil layer humidification depth, improving humidification；Dress
It is reusable with formula humidification groove.U-shaped steel board slot (11) bottom width about 800mm, depth are 600~800mm, U-shaped steel board slot
(11) side plate and bottom plate are equipped with drainage hole (24), and the horizontal wing plate (12) with hanging ring (13) is equipped at the top of side plate, are convenient for component
Dismounting；The middle partition (18) for increasing the rigidity of structure is provided in assembled humidification groove lumen.Cover board (20) can be closed, cover board
Side is equipped with hinged shaft (21), and the other side is equipped with snap-gauge (22), is used to support cover board when closing, and cover board is equipped with water injection hole (14)
For filling the water.Pile top (17) is set to humidification groove lower part, is convenient for humidification groove sinking；Vertical drainage pipe (15) with holes can increase humidification
Depth, outsourcing anti-filter geotextiles (16), for controlling water erosion.Connection floor (23) and overlap joint tongue and groove (19) are used for
The quick connection of adjacent assembled humidification groove fills cement mortar at overlap joint tongue and groove before connecting to increase sealing effect.
Collapsible loess zanjon high roadbed construction method of the invention, can promote filler humidification uniformly, improve and low contain
Water rate collapsible loess intensity reduces layer compression, improves uniformity, reduces uneven settlement of foundation.
Detailed description of the invention
Fig. 1 is collapsible loess zanjon high roadbed structure section figure；
Fig. 2 is one of assembled humidification slot structure schematic diagram；
Fig. 3 is assembled humidification groove second structural representation；
Fig. 4 is construction flow chart.
In figure: 1-zanjon sideline, 2-step excavations, 3-compactions in layers soil, 4-element earth piles, 5-hand excavations
Slot, 6-water blocking bodies, the 7-slopes humidification zone of influence, 8-top layers roll soil layer, 9-backfill layers, 10-compacting layers, 11-U with holes
Fashioned iron board slot, 12-horizontal wing plates, 13-hanging rings, 14-water injection holes, 15-vertical drainage pipes with holes, 16-anti-filter geotextiles,
17-pile tops, 18-middle partitions, 19-overlap joint tongue and grooves, 20-cover boards, 21-hinged shafts, 22-snap-gauges, 23-connection floors,
24-drainage holes.
Specific embodiment
Specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 is collapsible loess zanjon high roadbed structure section figure, and Fig. 2 is one of assembled humidification slot structure schematic diagram,
Fig. 3 is assembled humidification groove second structural representation, and Fig. 4 is construction flow chart.Collapsible loess as shown in Figure 1 is deep
Ditch high roadbed structure, mainly include step excavation 2, compaction in layers soil 3, element earth pile 4, hand excavation's slot 5, water blocking body 6,
Top layer rolls soil layer 8；Element earth pile 4 and step excavation 2 is arranged in compaction in layers soil borderline region, and 3 tops of compaction in layers soil are
Layer 10 is tamped, compacting layer top is that top layer rolls soil layer 8；Assembled humidification groove is provided in hand excavation's slot 5.
Assembled humidification groove mainly includes U-shaped steel board slot 11, vertical drainage pipe 15 with holes and pile top 17 with holes；It is with holes U-shaped
Setting overlap joint tongue and groove 19 and connection floor 23 before and after steel tank 11, top is provided with the retractable cover board 20 of water injection hole 14, bottom
Vertical drainage pipe 15 with holes and pile top 17 is arranged in portion.11 side plate of U-shaped steel board slot and bottom plate with holes are equipped with drainage hole 24, side plate top
Portion is equipped with the horizontal wing plate 12 with hanging ring 13, and the middle partition for increasing the rigidity of structure is provided in assembled humidification groove lumen
18.Cover board 20 can be closed, and cover board side is equipped with hinged shaft 21, and the other side is equipped with snap-gauge 22, is used to support cover board when closing, cover board
Water injection hole 14 is equipped with for filling the water.Pile top 17 is set to humidification groove lower part, is convenient for humidification groove sinking.Vertical drainage pipe 15 with holes
Humidification depth, outsourcing anti-filter geotextiles 16, for controlling water erosion can be increased.It connects floor 23 and overlap joint tongue and groove 19 is used
In the quick connection of adjacent assembled humidification groove, to increase sealing effect, cement mortar is filled at overlap joint tongue and groove before connecting.Saturated yielding
The construction method of property loess zanjon high roadbed structure, including following construction procedure:
1, zanjon garbage disposal, should within the scope of embankment, ground surface layer fertile soil, surface soil, turf etc. clear up；It excludes
Excess surface water；Making temporary road；
2, hole bottom site clearing is smooth, divides construction area, rams preceding smooth height with level measurement and records, according to
Point arrangement carries out the measurement of control axis and marks the position of point；
3, it is layered filler, loosened soil has point absolute altitude according to on-site using GPS before being laid with and marked in each region with mark post
Laying depth carries out repetition measurement with level after the completion of laying, carries out field control watering after filler；
4, it carries out excavating hand excavation's slot 5, spacing 4000mm using mini-excavator, fluting bottom width is 800mm, is opened
Groove depth is 600-800mm, and side grade is subject to assembled humidification slot structure；
5, assembled humidification groove is installed, carries out water filling humidification by control standard of optimum moisture content, dissipation 3 is stood after water filling
~5 days；
6, assembled humidification groove is hung, filler surface feed supplement leveling；
7, first determined according to depth of packing, hammer ram parameter and ram number, practical ramming times control for last two hit hit hole
Absolute altitude is not much different in 50mm；Hammer ram uniformly puts rammer；If it was found that bottom will should be cheated in time when causing hammer ram skew because cheating slanted floor
Leveling；When tamping pit is too deep, it is difficult body hammer occurs, but without obvious protuberance, and control standard has not yet been reached, preferably tamping pit is backfilled to
After hole top is concordant, continue to ram；
8, tamping pit is filled and led up with bull-dozer after ramming eventually, and measures site elevation；
9, side slope bench excavation, the slope surface that the embankment layer of every layer of strong rammer layer intersects with native soil layer extend out, and make embankment layer and original
Soil layer forms 1:1 step；Side slope water filling humidification is carried out later；
10, after successively above-mentioned construction procedure is completed in layering, top sheep-foot roller pressure, top layer backfills the earthwork with a thickness of 400mm, outside
Expanding 400mm makes embankment layer and native soil layer form 1:1 step, is rolled 8 times later with loading machine cleaning is smooth；
11, side slope juncture area long-spiral drilling machine soil taking hole forming；
12, element earth pile is constructed: stake diameter about 400mm, the long 12~20m of stake, stake spacing 1000, campshed spacing 866mm,
Blossom type arrangement is pressed in stake.Bottom hole is first tamped in hole before filler, ramming times are not less than 6 times；Then artificial uniform filler is used,
Each backfill amount is 0.12~0.15m3, filler depth is in 0.8~1.0m or so；Tu Chang is being taken to take native stock first before filler,
It is allowed for filling perforation materials close to optimum moisture content when side in earth material moisture content, the filler content of organic matter is not greater than 5%.
13, it removes top and loosens layer, decking and rolling to designed elevation；
14, pile body and inter-pile soil detect soil layer, detect its compacting factor with cutting ring manual sampling, and pile body is averaged compacting factor
Not less than 0.97, compacting factor is not less than 0.93 between stake, and minimum dentification factor is not less than 0.88 between three；
15, writing of construction materials, delivery receiving acceptance.
Claims (5)
1. the construction method of collapsible loess zanjon high roadbed structure, it is characterised in that the collapsible loess zanjon high roadbed knot
Structure mainly includes that compaction in layers native (3), element earth pile (4), hand excavation's slot (5), assembled humidification groove, top layer roll soil
Layer (8) and water blocking body (6)；Compaction in layers soil borderline region setting element earth pile (4) and step excavation (2), layering are rammed
Real soil (3) top is compacting layer (10), and compacting layer top is that top layer rolls soil layer (8)；Assembled is provided in hand excavation's slot
Humidification groove；The assembled humidification groove mainly includes U-shaped steel board slot (11), vertical drainage pipe with holes (15) and pile top with holes
(17)；Setting overlap joint tongue and groove (19) and connection floor (23) before and after U-shaped steel board slot (11) with holes, top is provided with water injection hole
(14) vertical drainage pipe (15) with holes and pile top (17) is arranged in retractable cover board (20), bottom；
The construction method mainly comprises the steps that
Step 1: zanjon garbage disposal, within the scope of embankment, ground surface layer fertile soil, surface soil, turf clear up；Exclusively
Area water；Making temporary road；
Step 2: hole bottom site clearing is smooth, construction area is divided, ram preceding smooth height with level measurement and is recorded, root
Strong point position arrangement carries out the measurement of control axis and marks the position of point；
Step 3: layering filler, loosened soil has point absolute altitude according to on-site using GPS before being laid with and is marked in each region with mark post
Laying depth carries out repetition measurement with level after the completion of laying, carries out field control watering after filler；
Step 4: using mini-excavator excavate hand excavation's slot (5), side grade be subject to assembled humidification slot structure；Institute
Stating assembled humidification groove mainly includes U-shaped steel board slot (11), vertical drainage pipe with holes (15) and pile top (17) with holes；It is with holes U-shaped
Setting overlap joint tongue and groove (19) and connection floor (23) before and after steel tank (11), top is provided with the retractable lid of water injection hole (14)
Vertical drainage pipe (15) with holes and pile top (17) is arranged in plate (20), bottom；
Step 5: installation assembled humidification groove, carries out water filling humidification by control standard of optimum moisture content, stands and dissipate after water filling
3 ~ 5 days；Then assembled humidification groove is hung, filler surface feed supplement leveling；
Ram number Step 6: first determining according to depth of packing, hammer ram parameter, practical ramming times control for last two hit hit hole
Absolute altitude is not much different in 50mm；Hammer ram uniformly puts rammer；If it was found that bottom will should be cheated in time when causing hammer ram skew because cheating slanted floor
Leveling；When tamping pit is too deep, occurs proposing hammer difficulty, but without obvious protuberance, and control standard has not yet been reached, tamping pit is backfilled to hole
After top is concordant, continue to ram；Tamping pit is filled and led up with bull-dozer after ramming eventually, and measures site elevation；
Step 7: side slope bench excavation, the slope surface that the embankment layer of every layer of strong rammer layer intersects with native soil layer is extended out, and makes embankment layer and original
Soil layer forms 1:1 step；Side slope water filling humidification is carried out later；
Step 8: after successively above-mentioned construction procedure is completed in layering, top sheep-foot roller pressure, top layer backfills the earthwork with a thickness of 400mm,
Extending out 400mm makes embankment layer and native soil layer form 1:1 step, is rolled 8 times later with loading machine cleaning is smooth；
Step 9: side slope juncture area long-spiral drilling machine soil taking hole forming, element earth pile construction is carried out after pore-forming, then removes top
Portion loosens layer, decking and rolling to designed elevation；
Step 10: pile body and inter-pile soil detect soil layer, its compacting factor is detected with cutting ring manual sampling.
2. construction method according to claim 1, it is characterised in that the compaction in layers native (3) is layering filling tamped knot
Structure, every 3 ~ 6m of layer depth.
3. construction method according to claim 1, it is characterised in that the element earth pile (4) is set to compaction in layers soil
Blossom type arrangement is pressed in boundary, stake diameter 400mm, the long 12 ~ 20m of stake, 1000 mm of stake spacing, campshed spacing 866mm, stake.
4. construction method according to claim 1, it is characterised in that hand excavation's slot (5) is excavated in every layer of filler
On.
5. construction method according to claim 1, it is characterised in that U-shaped steel board slot (11) side plate and bottom plate with holes are equipped with
Drainage hole (24), side plate top are equipped with the horizontal wing plate (12) with hanging ring (13), are provided with and are used in assembled humidification groove lumen
Increase the middle partition (18) of the rigidity of structure.
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| CN109797730B (en) * | 2019-01-29 | 2020-07-10 | 中国机械设备工程股份有限公司 | Comprehensive compaction filling method for filling and land building in loess hilly gully region |
| CN110318757A (en) * | 2019-05-17 | 2019-10-11 | 昌鑫生态科技(陕西)有限公司 | Pit stemming operation technology |
| CN110344420A (en) * | 2019-07-30 | 2019-10-18 | 北京首钢建设集团有限公司 | It constructs after first backfill in a kind of lowered zones the method on basis |
| CN111893831A (en) * | 2020-07-27 | 2020-11-06 | 中交路桥建设有限公司 | Collapsible loess roadbed construction method |
| CN112858633B (en) * | 2021-01-14 | 2023-02-07 | 三门峡职业技术学院 | Large-thickness collapsible loess humidifying deformation experimental device |
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| SU690117A1 (en) * | 1978-03-14 | 1979-10-05 | Таджикский политехнический институт | Method of consolidating loess soil |
| CN103806432B (en) * | 2014-01-25 | 2017-04-19 | 西安科技大学 | Method for treating foundations in slope filling and digging joint part of wet and soft zone in loess region |
| CN106193062A (en) * | 2016-08-19 | 2016-12-07 | 西北大学 | Loess high roadbed and construction method thereof in ditch engineering are filled out in a kind of mountain of moving |
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