CN104775412B - Stratum reinforcement PSC construction method - Google Patents

Stratum reinforcement PSC construction method Download PDF

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Publication number
CN104775412B
CN104775412B CN201510132913.3A CN201510132913A CN104775412B CN 104775412 B CN104775412 B CN 104775412B CN 201510132913 A CN201510132913 A CN 201510132913A CN 104775412 B CN104775412 B CN 104775412B
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China
Prior art keywords
construction
stratum
psc
hole
grouting
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CN104775412A (en
Inventor
刘建
郑杨锐
刘军
谢远云
梁远波
魏建滨
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Guangdong Xinlong tunnel equipment Limited by Share Ltd
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Guangzhou Jian Heng Mechanical And Electric Equipment Installation Co Ltd
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Publication of CN104775412A publication Critical patent/CN104775412A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00Investigation of foundation soil in situ
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12Consolidating by placing solidifying or pore-filling substances in the soil
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/003Injection of material
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder

Abstract

The invention discloses a stratum reinforcement PSC construction method which comprises the following construction steps: lofting hole sites; performing first hole construction; determining slurry proportion; performing stratum drainage construction; performing stratum reinforcement grouting; repeating the last two steps, thereby finishing all the stratum reinforcement PSC construction steps. The stratum reinforcement PSC construction method has the beneficial effects that equipment used in the stratum reinforcement method is relatively small in size and flexible in movement among hole sites; the slurry consolidation time can be regulated according to practical situations; the slurry penetrability is favorable; the slurry can be consolidated under the condition of circulating water, is difficult to dissolve and good in water stop effect; the reinforcement method is applicable to various strata, wide in application range, good in environment-friendly functional effect, less in environment pollution, good in safe operation function and high in construction speed; by virtue of adopting the technology for construction, the construction process includes advancing-type construction and backing-type construction, additional hole guiding is not needed, the additional hole guiding time is saved, and hole collapse is avoided; the preparation of construction is simple, around-the-clock construction can be performed and the engineering cost is low.

Description

Stratum consolidation PSC construction methods
Technical field
The present invention relates to stratum consolidation construction field, more particularly to a kind of stratum consolidation PSC construction methods.
Background technology
Domestic tunneling shield construction termination and building stratum consolidation method are mainly with modified form, displaced type, extrusion pressing type etc. Main reinforcement means.Prior art passes through rotary churning pile, sleeve valve barrel grouting to reach stratum consolidation purpose, for rich water sandy ground Layer, existing reinforcement means there is no a kind of safe, economic, efficient, ripe reservoir treating construction method.
Domestic prior art related to invention at present has one.To apply artificial China Railway Erju Co., Ltd with Two innings of first Engineering Co., Ltd of ferrum, number of patent application is 201110064110.0 patent of invention " soft clay area foundation stabilization Construction method ", the invention discloses a kind of soft clay area foundation stabilization construction method, using following steps:Construction equipment is accurate It is standby;Construction site prepares;The steps such as surveying and locating.Current this construction method only perforate grouting behind shaft or drift lining on the ground, without improving Soil layer, the bulk strength after construction does not obtain the improvement of essence, and this construction method cannot meet now higher and higher applying Work is required.
The content of the invention
The technical problem to be solved in the present invention is to provide that a kind of construction effect is good, applied widely, environmental pollution is few, construction Safe and with low cost stratum consolidation PSC construction methods.
In order to solve technical problem proposed by the invention, the invention discloses a kind of stratum consolidation PSC construction methods, should Stratum consolidation PSC construction methods include following construction procedure:
A, hole position setting-out:Line is tested qualified through repetition measurement to each hole position setting-out according to design requirement total powerstation before construction Afterwards, positioned on ground;
B, the construction of the first hole:The first hole bore operation is carried out using rig, drilling process wants microrunning, grasps operation During impact situation of the stratum to rig, it is determined that the drilling parameter under the formation condition, while test determining stratum geology Situation;
C, determine wet end furnish:Draining chemical sizwe proportioning and grouting are determined according to reinforcing area stratum geological condition Wet end furnish is reinforced in grouting filling perforation;
D, layer drainage construction:Reusing underground drill rig carries out bore operation, while drill bit is drilled into reinforcing area Using grouting pump by the chemical sizwe injection reinforcing area for determining proportioning, until it reaches design hole depth;
E, stratum consolidation slip casting:Stratum draining is completed by what filling perforation reinforcing slurry implantation step d was obtained using grouting pump Reinforcing area in;
F, repeat step d, e can complete whole stratum consolidation PSC construction procedures.
Stratum consolidation PSC construction methods disclosed by the invention are different from original form of construction work, and stratum is analyzed first Make construction more targeted, and it is further to configure corresponding slurry construction quality according to stratum geological condition behind analysis stratum It is guaranteed;Carrying out a stratum draining during boring under underground drill rig drill bit can exclude stratum moisture content, improve The impermeability of the soil body;Slurry is reinforced in filling perforation according to obtaining after analysis stratum geological condition can change former physical properties of soil simultaneously Improve the comprcssive strength of the soil body, finally make weakness soil layer (especially chiltern, gravelly clay and layer of sand) become it is impervious high, Comprcssive strength height and the high reinforcing body of stability.
As a modification of the present invention:The draining includes waterglass and phosphoric acid with chemical sizwe.Waterglass and phosphoric acid It is conventional industrial materials, production cost can be effectively reduced.
As a modification of the present invention:Slurry is reinforced in the grouting filling perforation includes waterglass and cement mortar.Waterglass It is conventional construction material with cement mortar, production cost can be effectively reduced.
As a modification of the present invention:Bore operation in described ground layer drainage construction step is one lateral by construction surface Opposite side is carried out, and is sequentially completed stratum draining.Drilled by a lateral opposite side of construction surface, stratum draining can be protected Card once excludes the water in stratum from a lateral opposite side, and this form of construction work can obtain the substantially uniform stratum of parameter, Construction quality can be improved.
As a modification of the present invention:The consolidation grouting process is carried out after ground layer drainage construction is fully completed, institute State consolidation grouting process is carried out from construction surface periphery to central area.Stratum consolidation slip casting is entered from construction surface periphery to central area Row is to reinforce slurry due to filling perforation to have swelling during solidification, can ensure that to central area from periphery and is applying The ground for completing of having constructed will not be destroyed around construction surface due to the expansion that filling perforation is reinforced in slurry process of setting during work Layer, affects the outer stratum of construction area to stablize.
As a modification of the present invention:The consolidation grouting process is lifted by hole bottom up, and lifting speed needs root According to flow rate of grouting and grouting amount and the adjustment of slip casting penetration radius.The control for lifting speed ensure that slip casting effect, it is to avoid slurry Liquid makes very little the not enough formation cavity of serosity in hole or stablizes because serosity excessively destroys this side stratum.
As a modification of the present invention:The consolidation grouting of step e is in step d is completed by chemical sizwe hand-hole Complete when drill bit of drilling machine is lifted after the step of hole.Note during underground drill rig drilling rod is lifted after chemical sizwe hand-hole is completed Entering filling perforation reinforcing slurry can effectively shorten the engineering time, and stratum draining and stratum consolidation slip casting can be in underground drill rigs once Complete during operation.
As a modification of the present invention:The underground drill rig bore operation is carried out from construction surface periphery to central area, And need to detect stratum geological condition during bore operation, chemical sizwe is adjusted according to formation parameter and slurry is reinforced in filling perforation Proportioning.Stratum geological condition is detected during bore operation and chemical sizwe and filling perforation reinforcing are adjusted at any time according to stratum geological condition The proportioning of slurry can effectively ensure that construction quality, and construction effect is more preferable.
As a modification of the present invention:The stratum consolidation slip casting process underground drill rig drilling rod lifts speed need to be according to note Slurry flow and grouting amount and the adjustment of slip casting penetration radius.
As a modification of the present invention:The grouting pump is Double-liquid mud-injection pump.Double-liquid mud-injection pump can complete two kinds of slurries The slip casting of liquid.
Generally speaking the present invention has the advantages that:
1st, general utility functionss
Local layer reinforcement means is less using equipment size, and equipment movement hole position is flexible;The slurry consolidation time can be according to reality Border situation adjustment;Slurry infiltration is good;Serosity can be consolidated in the case of circulating water, and serosity is not readily dissolved, and stagnant water effect is good; Reinforcement means is applied to all kinds of stratum, applied widely;
2nd, environment-friendly function
To subsoil water nontoxic pollution-free, serosity is not lost in the serosity that the stratum consolidation method is adopted, and mud is not produced substantially, Without the need for mud outward transport, environmental pollution is little;
3rd, safety work function
Implement is simple, and plant equipment is moved conveniently in work surface, and flexible operation, construction safety is controllable;Consolidation effect Ideal, meets the construction requirements such as stratum consolidation, building strengthening, tool changing point are reinforced, shield-tunneling construction termination reinforces;
4th, speed of application is fast
Using the technology construction, construction technology point protrusive and retrusive construction, without the need for drawing hole in addition, hole is drawn in addition in saving Time, it is to avoid collapse hole occurs.Preparation of construction is simple, can carry out operation in 24 hours;
5th, engineering cost
This engineering construction equipment is simple, and it is less that equipment enters appearance expense;Equipment operation simple and flexible, workmen is less; Construction material waste rate is relatively low, material-saving cost of idleness.
Specific embodiment
Need to carry out safe practice to workmen before stratum consolidation construction to tell somebody what one's real intentions are, scene is equipped with technician's guiding construction, matches somebody with somebody Standby specialty captain operation ruggedized equipment.Need to be equipped with site operation person in work progress, it is ensured that slip casting depth, grouting amount, serosity are matched somebody with somebody Than and the competition of the technology such as slurry consolidation time meet construction technical requirement.In addition workmen need to focus on safety management, quality The relevant knowledges such as control, environmental conservation.
Preparation of construction includes following several steps:
1. enclosing construction
Formally march into the arena before construction, first carry out enclosing construction, and carry out roadblock and security warning.Put on the inside of enclosing simultaneously Sandbag, prevents other road surfaces of mud contamination of being scattered;
2. pipeline detection
Pipes investigation is first carried out, is constructed if the region is without pipeline;If pipeline, then trial trench is excavated, it is determined that The orientation of underground utilities, and carry out protective measure;
3. construction site layout
Before construction, place is arranged, determines the optimal putting position of plant equipment and material;
4. hole position setting-out
According to design requirement total powerstation to each hole position setting-out before construction, through repetition measurement test line it is qualified after, existed with steel nail Ground is positioned, it is ensured that stake holes center shift variance is less than 50mm.
According to design requirement after preparation before completing to construct, rig is directed at into hole position, vertical angle drilling, it is desirable to Hole position deviation is ± 3cm, and incident angle deviation is not more than 1 °.After alignment hole position, rig must not be shifted, also must not arbitrarily landing.
The first hole construction is carried out after underground drill rig positioning, microrunning is wanted in the first hole when constructing, grasp stratum to rig Impact situation, to determine the drilling parameter under the formation condition, while test determining stratum geological condition.Close observation spilling water Water outlet situation, when there are a large amount of spilling water water outlets, should stop immediately to bore, and be constructed again after analysis reason.One section is often crept into, one is checked Section, correction in time, bottom hole position should be less than 30cm.
Stratum geological condition according to obtaining determines that the proportioning of slurry is reinforced in draining chemical sizwe and grouting filling perforation, really Determine to prepare water glass solution I, water glass solution II, phosphoric acid solution, the cement mortar of constitutional chemistry slurry, water according to proportioning after proportioning Glass solution I, water glass solution II, phosphoric acid solution be mounted in it is standby in solution tank, cement mortar scene at any time mixing use.
After determining wet end furnish, during note chemical grout, by wherein one pulp-absorbing pipe of Double-liquid mud-injection pump and water glass solution I Solution tank connection, another pulp-absorbing pipe be connected with the solution tank of phosphoric acid solution;When slurry is reinforced in note filling perforation, Double-liquid mud-injection pump The cement grout mixing bucket that piece pulp-absorbing pipe is reinforced with filling perforation is connected, and another pulp-absorbing pipe connects with the solution tank of water glass solution II Connect;There are two grouting pipes during note difference slurry, two grouting pipes are double with underground drill rig by two fluid grouting faucet Liquid drilling rod connects.
The estimation equation of the grouting amount of the present invention is carried out as the following formula:
Q=Anα
In formula:Q---- grouting amounts(m3);
A---- range of grouting volumes(m3);
N---- porositys;
α ----serosity filling rate.
The embodiment of ground layer drainage construction and stratum consolidation slip casting is presented herein below, by two kinds of different embodiments to this Invention is described further.
Embodiment 1
Determine and carry out after proportioning stratum drainage construction, reusing underground drill rig carries out boring shape under bore operation, drill bit Into hole diameter be not less than 40mm, under drill bit bore while determination is matched somebody with somebody using the chemical sizwe transfer pump of Double-liquid mud-injection pump In the chemical sizwe injection hole of ratio;And the bore operation in ground layer drainage construction step is by a lateral opposite side of construction surface Carry out successively completing stratum draining.
Complete to carry out stratum consolidation slip casting after the draining of stratum, need again to move to underground drill rig in stratum consolidation slip casting Complete at the hole of stratum draining, drill bit to be pierced again in hole, noted using biliquid when drill bit reaches hole bottom The filling perforation of stock pump is reinforced slurry transfer pump and has completed filling perforation reinforcing slurry injection in the hole of stratum draining;Stratum consolidation slip casting Process is carried out from construction surface periphery to central area.Stratum consolidation slip casting process slip casting termination is lifted by hole bottom up, note During slurry, marginal not slurry side carries drilling rod, strict control lifting amplitude, and often step is 0.3~0.4m, and at the uniform velocity pumpback notices that slip casting is joined Number change, lifting speed need to be according to flow rate of grouting and grouting amount and the adjustment of slip casting penetration radius, when grouting amount or grouting pressure Reach and proceed after design load shadoof.
The process of slip casting needs strict control grouting pressure, while pay close attention to grouting amount, when pressure moment rise or from Hole wall, section sand layer overflow when starching, and should immediately stop slip casting, and the measure of adjustment grouting parameter or displacement etc. is taken after ascertaining the reason again Slip casting.
Embodiment 1 carries out hole consolidation grouting after entirely layer drainage construction process is completed, can in whole process The moisture contained by stratum is effectively excluded, reinforcing body comprcssive strength is higher, and impervious effect is good.
Embodiment 2
Determine and carry out after proportioning stratum drainage construction, reusing underground drill rig carries out boring shape under bore operation, drill bit Into hole diameter be not less than 40mm, under drill bit bore while determination is matched somebody with somebody using the chemical sizwe transfer pump of Double-liquid mud-injection pump In the chemical sizwe injection hole of ratio;The filling perforation reinforcing slurry for starting Double-liquid mud-injection pump when drill bit is lifted up starts slip casting, Strict control lifting amplitude, often step is 0.3~0.4m, and at the uniform velocity pumpback notices that grouting parameter changes, and lifting speed need to be according to slip casting Flow and grouting amount and the adjustment of slip casting penetration radius, after grouting amount or grouting pressure reach design load shadoof is proceeded.
The process of slip casting needs strict control grouting pressure, while pay close attention to grouting amount, when pressure moment rise or from Hole wall, section sand layer overflow when starching, and should immediately stop slip casting, and the measure of adjustment grouting parameter or displacement etc. is taken after ascertaining the reason again Slip casting.
Underground drill rig bore operation is carried out from construction surface periphery to central area in whole process, and in the mistake of bore operation Cheng Zhongxu detects stratum geological condition, adjusts chemical sizwe according to formation parameter and the proportioning of slurry is reinforced in filling perforation.
Embodiment 2 carries out hole consolidation grouting, whole mistake when drilling rod is lifted after the completion of carrying out ground layer drainage construction process Journey can be completed once, effectively improve efficiency of construction.
Embodiments of the invention 1 and embodiment 2 all first with water glass solution I and phosphoric acid solution carry out soil body draining, improve The impermeability of the soil body, then soil solidifying is carried out with water glass solution II and cement mortar, change former physical properties of soil and improve soil The comprcssive strength of body and impervious effect, finally making the soil layer (especially chiltern, gravelly clay and layer of sand) of weakness becomes impervious Property high, comprcssive strength is high and stability the is high soil body, reach soil stabilization so as to meet design requirement.
The better embodiment of the present invention is the foregoing is only, above-mentioned embodiment is the invention is not limited in, is being implemented During there may be local minor modifications, if to the present invention various changes or modification without departing from the present invention spirit and model Enclose, and belong within the scope of the claim and equivalent technologies of the present invention, then the present invention is also intended to comprising these changes and modification.

Claims (10)

1. stratum consolidation PSC construction methods, it is characterised in that:Stratum consolidation PSC construction methods include following construction procedure:
A, hole position setting-out:According to design requirement total powerstation to each hole position setting-out before construction, through repetition measurement test line it is qualified after, Ground is positioned;
B, the construction of the first hole:The first hole bore operation is carried out using underground drill rig, drilling process wants microrunning, grasps stratum Impact situation to rig, it is determined that the drilling parameter under the formation condition, while test determining stratum geological condition;
C, determine wet end furnish:Draining chemical sizwe proportioning and grouting filling perforation are determined according to reinforcing area stratum geological condition Reinforce wet end furnish;
D, layer drainage construction:Reusing underground drill rig carries out bore operation, uses while drill bit reaches reinforcing area Grouting pump is by the chemical sizwe injection reinforcing area for determining proportioning, until it reaches design hole depth;
E, stratum consolidation slip casting:Adding for stratum draining is completed by what filling perforation reinforcing slurry implantation step d was obtained using grouting pump Gu in region;
F, repeat step d, e can complete whole stratum consolidation PSC construction procedures.
2. stratum consolidation PSC construction methods according to claim 1, it is characterised in that:Draining chemical sizwe bag Include waterglass and phosphoric acid.
3. stratum consolidation PSC construction methods according to claim 1, it is characterised in that:The grouting filling perforation adds stereoplasm Material includes waterglass and cement mortar.
4. stratum consolidation PSC construction methods according to any one of claims 1 to 3, it is characterised in that:The stratum draining Bore operation in construction procedure is carried out by a lateral opposite side of construction surface, is sequentially completed stratum draining.
5. stratum consolidation PSC construction methods according to claim 4, it is characterised in that:The stratum consolidation slip casting process Carry out after ground layer drainage construction is fully completed, the stratum consolidation slip casting process is carried out from construction surface periphery to central area.
6. stratum consolidation PSC construction methods according to claim 5, it is characterised in that:The stratum consolidation slip casting process Slip casting termination is lifted by hole bottom up, and lifting speed need to adjust according to flow rate of grouting and grouting amount and slip casting penetration radius It is whole.
7. stratum consolidation PSC construction methods according to claim 1, it is characterised in that:The stratum consolidation note of step e Slurry is completed when drill bit of drilling machine is lifted after the step of chemical sizwe is injected into hole in completing step d.
8. stratum consolidation PSC construction methods according to claim 7, it is characterised in that:The underground drill rig bore operation Carried out to central area from construction surface periphery, and need to detect stratum geological condition during bore operation, according to stratum ground Matter situation adjusts chemical sizwe and the proportioning of slurry is reinforced in grouting filling perforation.
9. stratum consolidation PSC construction methods according to claim 7, it is characterised in that:The stratum consolidation slip casting process Underground drill rig drill bit lifts speed need to be according to flow rate of grouting and grouting amount and the adjustment of slip casting penetration radius.
10. stratum consolidation PSC construction methods according to claim 1, it is characterised in that:The grouting pump is two fluid grouting Pump.
CN201510132913.3A 2015-03-25 2015-03-25 Stratum reinforcement PSC construction method Active CN104775412B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110777774A (en) * 2019-11-04 2020-02-11 南通五建控股集团有限公司 Double-component grouting method for reinforcement design of soft foundation and side slope

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CN105971637A (en) * 2015-03-12 2016-09-28 中铁隆工程集团有限公司 Application of WSS construction method in shield end reinforcement of water-rich sand layer
CN108951438A (en) * 2017-05-17 2018-12-07 沈阳市政集团有限公司 To cable protection construction method in earthing in box culvert advancing
CN108798693A (en) * 2018-06-11 2018-11-13 中交公局海威工程建设有限公司 For band sand layer pipe jacking construction method

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JP2002167746A (en) * 2000-11-29 2002-06-11 Kfc Ltd Ground reinforcing construction method and hole wall holding casing pipe used therefor
CN102108873B (en) * 2009-12-29 2013-11-06 河南博特工程防护有限公司 High-polymer grouting method for rapidly disposing percolating water in tunnel
JP5696687B2 (en) * 2012-05-30 2015-04-08 株式会社大林組 Ground reinforcement structure construction method
CN103046534B (en) * 2012-12-28 2014-11-12 宁波高新区围海工程技术开发有限公司 Method for improving bearing capacity of foundation
CN103132536A (en) * 2013-03-18 2013-06-05 中国水利水电第七工程局成都水电建设工程有限公司 Drainage technology of geologic chemistry before grouting

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110777774A (en) * 2019-11-04 2020-02-11 南通五建控股集团有限公司 Double-component grouting method for reinforcement design of soft foundation and side slope

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