CN1252359C - Operation method for supportins soft border by using earth slope nails - Google Patents
Operation method for supportins soft border by using earth slope nails Download PDFInfo
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- CN1252359C CN1252359C CN 03112359 CN03112359A CN1252359C CN 1252359 C CN1252359 C CN 1252359C CN 03112359 CN03112359 CN 03112359 CN 03112359 A CN03112359 A CN 03112359A CN 1252359 C CN1252359 C CN 1252359C
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Abstract
The present invention belongs to the technical field of rock and soil engineering, and proposes an operation method for supporting soft soil by using soil nails on side slopes. Firstly, a construction site is measured, and lines are put out. The present invention is characterized in that the construction is carried out by the following method after the lines are put out: a. before excavation, a mechanical method or a manual method is adopted to perpendicularly drive an anchor tube (8) with a grouting hole to a soft soil layer according to positions of the lines to carry out pressure controlled grouting; b. a sectional spacing excavation method is adopted; the excavation depth of each layer doesn't exceed the critical self stable height; the spacing distance is from 8 to 10m; the excavation is perpendicularly carried out along the inner side of the vertical anchor tube (8); c. a free face which is excavated is treated by net hanging spray; d. initial stress is exerted to soil nails (6); the soil snails are in equidistant quincunx arrangement, and are driven into the soil body along the direction perpendicular to a side slope; pressure controlled grouting is carried out to the soil nails; e. the soil nail (6), net ribs (7) and the anchor tube (8) are treated by rigid fixation; then operation of spraying concrete is carried out; in each excavation of each layer, the procedures from b to e are repeated till a substrate (9); a drain ditch (5) is arranged on the substrate.
Description
Technical field
The invention belongs to the geotechnical engineering technical field, mainly propose a kind of soft soil slope plate brad supporting worker method.
Background technology
Traditional soft soil slope engineering generally adopts worker's method constructions such as ground-connecting-wall, agitation pile, makes engineering accident frequent, and its success rate only accounts for about three one-tenth.Why such situation can occur, be owing to all be to adopt passive supporting method in these methods.And characteristics such as weak soil has the water content height, compressibilty is big, water permeability is little, mechanical strength is low, the critical height is little, poor stability; Has special failure mode as a kind of poorly plastid, i.e. " stream drum failure mode ".Therefore, above-mentioned traditional supporting method excavates free face as shown in Figure 1, anchor pole 3 is driven into slip casting in the weak soil, can not block creeping line 1 on its vertical direction, cause the toe unstability, can not carry out any improvement the mechanical property of weak soil thereby can not fundamentally solve heave 2.When slope height reached certain limit, the lateral pressure of weak soil will certainly surpass the shear strength of retaining structure, thereby whole slump situation occurs.And soil nailing wall worker method has also obtained certain application in recent years as a kind of novel support technology in the soft soil slope engineering, because its supporting height is identical with the side slope vertical height, can not effectively prevent heave and toe unstability (as shown in Figure 1), the soil nailing of soil nailing wall method is not considered to fix with the welding of steel mesh reinforcement in addition, soil nailing does not apply prestressing force yet, supporting mechanism and side slope can not form an integral body, thereby finally are difficult to guarantee the stable of side slope.
Summary of the invention
Purpose of the present invention promptly is to propose a kind of soft soil slope plate brad supporting worker method, in order to improve the self-stable ability of the weak soil soil body, guarantees the safety and stability of side slope.
Purpose of the present invention can adopt following technical scheme to realize: at first measure the construction plant and carry out unwrapping wire, after construct by the following method:
Adopt machinery or artificial method vertically to get to assigned address before a, the excavation, carry out pressure control slip casting by the anchor tube that the unwrapping wire position will be furnished with injected hole;
B, adopt segmentation to jump the lattice excavation method for the excavation of each layer, every layer of cutting depth be the super soil body critical from steady height not, jumps compartment apart from 8-10m, digs under vertically along vertical anchor tube inboard (with respect to excavation face the sky interface);
C, the free face that excavates out is laid steel mesh reinforcement and construction of shotcrete;
D, apply prestressing force, on the aspect of excavating out,, soil nailing is squeezed in the soil body, soil nailing is carried out pressure control slip casting along the direction vertical with side slope by quincunx equidistant layout soil nailing to soil nailing.
E, soil nailing and net muscle and anchor tube are rigidly fixed the multiple spray in back.To the construction repeating step b-e of every excavation layer,, and the gutter is set in substrate up to substrate.
Described anchor tube front end wedgewise, its length be greater than the vertical height of side slope, the spacing 30cm-50cm that anchor tube is arranged.
To the deadweight of the pressure control grouting pressure at the place, arbitrary depth point of anchor tube and soil nailing less than the soil at this some place.
Described soil nailing will apply prestressing force when construction, its prestressed size is the 20-30% of single soil nailing ultimate pullout capacity.
The worker's method that is provided by foregoing invention has following good effect:
1, owing to before the excavation ground, adopt leading vertical high mine anchor tube supporting, and to carrying out pressure control slip casting in the anchor tube, can make mortar squeeze (oozing) and go in the weak soil medium anchor tube hole outside, to improve native physico-mechanical properties, improve its mechanical strength and engineering stability.Because anchor tube is a continuity mechanism, generally once finishes, it can be made by common steel tube, and is easy to maintenance.Since the length of anchor tube greater than the side slope vertical height, can block the in esse creeping line in toe bottom, thereby prevent heave and toe unstability, guarantee the stability in the work progress.
2, because anchor tube and soil nailing are adopted pressure control slip casting, and increase, neither can cause the building destruction on the ground at this moment, can effectively improve reinforcing to soil matrix bottom soil again, improve its mechanical strength and engineering stability with the excavation of foundation pit degree of depth.
3, because soil nailing head and anchor tube in worker's method of the present invention are welded to one another fixing, and firmly weld together with the extension muscle bar none from top to bottom, so that supporting and protection structure with formed an integral body by the supporting soil body, thereby reach the purpose that improves the side slope resistance to overturning.
4, owing in construction, apply lower-prestressed, can effectively control shallow-layer distortion and little slump, not influence its support action simultaneously again the deep sliding face to soil nailing.
Characteristics of the present invention are supportings while excavating, and need not backfill, and can enlarge the building usable floor area to greatest extent, can save construction investment more than 30%, 13 months reductions of erection time, reduced excavation, and the construction civilization does not have hazardous noise and pollution.
Description of drawings
Accompanying drawing 1 is the supporting and protection structure schematic diagram of traditional worker's method.
The overall structure schematic diagram of accompanying drawing 2 supporting and protection structure of the present invention.
Among the figure, 1, the creeping line, 2, protuberance, 3, anchor pole, 4, weak soil, 5, the gutter, 6, soil nailing, 7, the steel mesh reinforcement surface layer, 8, advance support high pressure anchor tube, 9, ground.
The specific embodiment
In conjunction with the accompanying drawings, it is as follows to further specify embodiments of the invention:
Described soft soil slope supporting construction method may further comprise the steps:
1, at first measures the construction plant and carry out unwrapping wire;
2, make anchor tube 8, the common commercially available steel pipe front end of φ 46mm is made wedge shape, evenly arrange an amount of injected hole on the body, its anchor tube length is greater than the vertical height of side slope, be convenient working, also anchor tube can be divided into plurality of sections, when carrying out site operation, welded.
3, arrange anchor tube 8.Anchor tube 8 is placed one according to unwrapping wire position etc. every 40cm, it is driven underground with the high pressure pneumatic hammer; If the segmentation anchor tube, squeeze into one section after, be driven underground again after again another section being welded with preceding location, and the like, until reaching requirement length.
4, to carrying out pressure control slip casting in the anchor tube.Grouting pressure stress at place, arbitrary depth point is conducted oneself with dignity less than the soil body of this point, and soil body deadweight is determined by product of weak soil average quality density and its height.The unit weight of supposing soil is γ, and h be the degree of depth of soil, establishes grouting pressure P, when more at ponding and do not influence the stable place of building, and for water is discharged, P 〉=γ h at this moment; In order to protect ground or the building on it, grouting pressure P≤γ h of this moment.
During excavation construction, adopt the method for stage excavation, below the job practices of each layer be:
5, excavation.Adopt segmentation to jump the lattice excavation method, it is critical from steady height (need not be any during supporting the soil body not the height of slump) that every layer of cutting depth is no more than this layer soil body, jumps compartment apart from be 9m, digs under vertically along vertical anchor tube 8 is inboard;
6, surface layer is handled.Every layer of free face that excavates out laid steel mesh reinforcement and concrete construction, form steel mesh reinforcement surface layer 7, steel grid spacing 30cm, surface thickness 10cm.
7, the layout of soil nailing 6.In the soil nailing 6 is hollow structure, be furnished with injected hole on it, soil nailing 6 is applied prestressing force, the prestressing force of soil nailing 6 is 25% of single soil nailing one ultimate pullout capacity, soil nailing 6 is by quincunx equidistant layout, every layer of excavation face handled the method edge of adopting hammering in the back it is squeezed in the soil body 6 with the side slope vertical direction, and to slip castings in the soil nailing 6.
8, soil nailing 6, anchor tube 8 and net muscle 7 usefulness spot welding knot are welded together admittedly.
9, carry out the sprayed mortar operation once more for the excavation surface layer.
10, for the construction repeating step 5-8 of each aspect, until substrate 9.Gutter 5 is set on ground.
For the layout of anchor tube, also can after first aspect of excavation, again anchor tube vertically be driven underground.
Claims (4)
1, a kind of soft soil slope plate brad supporting worker method is at first carried out unwrapping wire to the construction plant measurement, it is characterized in that, constructs by the following method behind the unwrapping wire:
Adopt machinery or artificial method vertically to be driven in the weak soil layer before a, the excavation, carry out pressure control slip casting by the anchor tube (8) that the unwrapping wire position will have injected hole;
B, adopt segmentation to jump the lattice excavation method, every layer of cutting depth is no more than the critical from steady height of this layer soil body, jumps compartment apart from 8-10m, digs under vertical along vertical anchor tube (8) is inboard;
C, the free face that excavates out is laid steel mesh reinforcement and construction of shotcrete;
D, apply prestressing force for soil nailing (6),, soil nailing is squeezed in the soil body, carry out pressure control slip casting to soil nailing along the direction vertical with side slope by quincunx equidistant layout soil nailing;
E, soil nailing (6) and net muscle (7) and anchor tube (8) are rigidly fixed, carry out the sprayed mortar operation then;
Repeat above-mentioned steps b-e for the excavation of each layer,, and gutter (5) is set in substrate until substrate (9).
2, soft soil slope plate brad supporting worker method according to claim 1 is characterized in that: described anchor tube (8) front end wedgewise, its length be greater than the vertical height of side slope, the spacing 30cm-50cm that anchor tube (8) is arranged.
3, soft soil slope plate brad supporting worker method according to claim 1 is characterized in that: to the deadweight less than the soil at this some place of the grouting pressure at the place, arbitrary depth point of anchor tube (8) and soil nailing (6).
4, soft soil slope plate brad supporting worker method according to claim 1 is characterized in that: described soil nailing (6) applies prestressing force when construction, its prestressed size is the 20-30% of single soil nailing ultimate pullout capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03112359 CN1252359C (en) | 2003-04-26 | 2003-04-26 | Operation method for supportins soft border by using earth slope nails |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03112359 CN1252359C (en) | 2003-04-26 | 2003-04-26 | Operation method for supportins soft border by using earth slope nails |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1540107A CN1540107A (en) | 2004-10-27 |
| CN1252359C true CN1252359C (en) | 2006-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 03112359 Expired - Fee Related CN1252359C (en) | 2003-04-26 | 2003-04-26 | Operation method for supportins soft border by using earth slope nails |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362128A (en) * | 2012-04-11 | 2013-10-23 | 青岛天力建筑加固工程有限公司 | Flexible material foundation pit support method |
| CN103215958A (en) * | 2013-04-22 | 2013-07-24 | 中国建筑第七工程局有限公司 | Construction method of dewatering and retaining and protecting of deep foundation pit in expansive-soil area |
| CN103243724A (en) * | 2013-05-22 | 2013-08-14 | 中铁二院工程集团有限责任公司 | Bedding cutting high slope closing reinforcement structure |
| CN104213568B (en) * | 2014-09-18 | 2016-04-06 | 成都理工大学 | Sand-sliding slope protector of a kind of slip casting solid end |
| CN105275000A (en) * | 2015-10-13 | 2016-01-27 | 中国十七冶集团有限公司 | Installing method of foundation pit slope support soil nails |
| CN106567393A (en) * | 2016-11-04 | 2017-04-19 | 中建六局土木工程有限公司 | Collapsible loess deep foundation pit support construction method |
| CN107620310B (en) * | 2017-08-01 | 2020-03-27 | 温州华隆建设有限公司 | Anchor pipe framework and supporting method thereof |
| CN111472370B (en) * | 2020-04-24 | 2021-06-11 | 梁维靖 | Slope collapse prevention structure for expressway and construction method thereof |
| CN112323818B (en) * | 2020-11-25 | 2022-05-03 | 成都城投建筑工程有限公司 | Soil nailing wall supporting construction |
| CN114032928B (en) * | 2021-11-05 | 2023-06-09 | 南华大学 | Soil nailing wall construction method for pre-reinforcing side slope rock soil body |
-
2003
- 2003-04-26 CN CN 03112359 patent/CN1252359C/en not_active Expired - Fee Related
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| CN1540107A (en) | 2004-10-27 |
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