CN102654056A - Shield construction method for clearing obstacles by punching rock stratum section - Google Patents
Shield construction method for clearing obstacles by punching rock stratum section Download PDFInfo
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Abstract
The invention relates to a shield construction method for clearing obstacles by punching a rock stratum section, comprising the following steps of: at first, determining a punching obstacle-clearing construction area as full-section punching construction; lapping at a pile hole position, wherein a bottom elevation of a pile is lower than a bottom elevation of a shield tunnel; determining a last-stage punching pile width range according to a probing result; carrying out punching obstacle-clearing construction by using a drilling construction process of a punching and filling pile; and directly injecting rapid-rigid slurry to fill an underground guide pipe after clearing the obstacles by punching. The obstacle-clearing construction method of a punching pile machine provided by the invention has the advantages of simple equipment, low manufacturing price, high security, rapid construction, smaller environment influence and the like, provides a novel treatment means for meeting the obstacles in underground engineering, such as shield, pipe-jacking and the like, and has a wide application prospect.
Description
Technical field
The present invention relates to removing rock stratum, pile body in the weak soil work progress of a kind of shield structure and push pipe, add the method for obstructions such as solid.
Background technology
Shield structure and push pipe often run into rock stratum, pile body in the weak soil work progress, add obstruction such as solid, and this type of situation is not often found in the geologic prospect in early stage, in work progress, needs removing obstacles to guarantee to accomplish smoothly driving.Have through the years development construction technology of removing obstacles: after 1. utilizing the auxiliary worker's method of pneumatic process or freezing that the barrier soil body is handled, from the anterior Tu Cang of entering of tool heads remove obstacles, 2. excavation remove obstacles the back backfill, 3. shield structure and push pipe tool heads cutter improve directly cutting of back, the 4. full circle swinging rig removing obstacles worker method changed.These several the technologies of removing obstacles each have its pluses and minuses, and all high just like poor stability, cost, problems such as equipment is responsible for, site requirements height.
Adopting internal diameters like three nuclear power first phases water intaking culvert pipe engineering aqueducts is two in the tunnel of φ 6200mm, and intake pipe adopts shield construction.According to the geologic prospect data that bid provides, one section rock zone is arranged outside circulating pump room, 1#, 2# tunneling shield go out the hole and in about 35m and 25m scope along the line, run into severely-weathered, middle weathering and gentle breeze andesite basalt respectively.Bidding plans are considered, adopt the New Austrian Tunneling Method constructing tunnel before this section shield driving construction, are the safety that guarantees the shield structure and tunnel smoothly, adopt the construction of " New Austrian Tunneling Method Blasting Excavation, shield method lining cutting ".It is weak soil and rock stratum interface that the shield structure goes out the hole strata condition, is distributed as backfill, mucky soil, clay and silty clay from top to bottom and mixes dust, severely-weathered, middle weathering, gentle breeze rock stratum.Backfill top, top, subregion also has backfill piece stone.
In early stage top soil body high-pressure rotary jet grouting pile work progress; According to absolute altitude situation analysis at the bottom of the rotary churning pile stake; The rock stratum absolute altitude is absolute altitude at the bottom of New Austrian Tunneling Method Tunnel Design length destination county still is higher than the tunnel, after the exploration of geology benefit is bright: the 1# shield structure section of appearing rock stratum increases to about 81m; The 2# shield structure section of appearing rock stratum increases to about 50m (borehole wall in the pump house forebay)
Because locating sleeve is buried underground, the inclination angle can't change, and limited by the worker's method of conventional tube canopy own, and the bassoon canopy sets length limited in the former New Austrian Tunneling Method scheme, rule of thumb should not be greater than 40 meters with geological condition, and maximum is no more than 45 meters.All greater than former schematic design length of tunnel and 45 meters, former constructure scheme can't normal construction for the distance that the actual rock stratum of verifying and tunnel have a common boundary.
If do not take to remove obstacles construction, former design has also been made the shield structure that finishes transformed, it is high perhaps to change the shield machine cost, and economic loss is big, and progress need prolong more than 1 year; Overlength pipe shed support (guiding is advanced method with pipe bit) is very big in the subsea construction risk, and the duration cost is also very high; So select to remove obstacles construction technology.
And if field investigation is carried out in the construction of adopting full circle swinging rotary drilling rig commonly used in the engineering to remove obstacles through the scene, job site, the outer seabeach district of steel sheet pile is difficult to satisfy this equipment and the site requirements of the 120T crane of cooperation with it; And these equipment workbench student contributions pooled to pay for class activities are higher, can't arrange many constructions simultaneously, cause the duration longer, and expense is very high.
Summary of the invention
The present invention will provide a kind of shield structure to meet the rock stratum section punching job practices of removing obstacles; This method will the section of appearing shield structure axis zone rock full scale clearance; Thereby guarantee the smooth tunneling construction of appearing safely of shield machine; And punching is removed obstacles needs use equipment simple, mainly contains the punching rig, mix slurry is concrete, slush pump, mobile crane, fixed pump, and auxiliary digging machine and mud transport vehicle etc.
For realizing above-mentioned purpose; Technical scheme of the present invention is: a kind of shield structure is met the rock stratum section punching job practices of removing obstacles; Confirm that at first the punching construction area of removing obstacles is full section punching construction; Stake position, hole overlap joint, a stake end absolute altitude are lower than absolute altitude at the bottom of the shield tunnel, and confirm later stage punching stake width range according to result of detection and the actual grade that combines the construction of punching in advance; Adopt concrete pouring of punched hole piles technology to carry out the punching construction of removing obstacles then, punching is removed obstacles and is accomplished the back and conduit is carried out under water in the punching stake directly press the fast rigid slurries backfill of notes.
Punching was adopted and is jumped pile constructing process during punching was removed obstacles and constructed, that is: same row jumps a pile, the construction of different row's jumping one campshed;
Allowable variation≤the 20mm at punching bit central and casing center during punching is removed obstacles and constructed, wire rope and drill bit center of gravity should remain on the same plumb line in the pore forming process, guarantee that drill bit creeps under the state that hangs tight.
Punching is removed obstacles in the impact holing process of constructing:
Should hang down when (1) beginning to impact basement rock that hammer is close to be hit or be interrupted impact, in order to avoid deflection.As find hole scattering, the backfill slabstone is to Kong Chu top 0.3 ~ 0.5m, impact again partially immediately;
Can suitably throw when (2) meeting arc stone and fill out the similar slabstone of hardness, use tension weight churning, or heavily hang down the stroke alternately impinge, big arc stone smashed clamp-on hole wall;
(3) accurately control slack rope length, the hammer of avoiding fanning the air;
(4) when bore inclining, need cleaning bottom of hole correction repeatedly, as correct invalidly, backfill clay or weathering sillar creep into impact more again to Kong Chu top 0.5m partially in the Ying Zaikong;
(5) in the pore-forming like the hole of collapsing, should stop immediately to bore, and the backfill clay, treat that hole wall impacts after stable again;
When (6) emitting slurry around the casing, mix yellow mud with straw and stop up a loophole, and press one deck mud, Sha Bao.
The invention has the beneficial effects as follows:
(1) safe and reliable, little to soil disturbance
This worker's method is being removed obstacles and backfill construction through mud off, the underground undisturbed soil of periphery is not destroyed or destroys little, and the underground soil body of periphery is not produced disturbance or produces very little disturbance.
(2) speed of application is fast, quality is high; And the scope of application extensively this worker's method can be carried out all kinds of pile pullings construction of removing obstacles according to requirement of engineering, like obstructions such as the old bored pile of various forms, all size, circumstance complication, various difficulty, preformed pile, pile for prestressed pipe, underground residual old steel concrete, piece stone, rock stratum.Operate simply at the control point, can guarantee the quality of removing obstacles.(3) risk little, ensure follow-up engineering construction
This worker's method is removed obstacles to obstruction cutting or with complete the pulling out of old stake, can be reached the construction purpose smoothly generally speaking.Even run into special circumstances, adopt joint form perhaps to repeat to remove obstacles, can guarantee to remove obstacles thoroughly.(4) energy-conserving and environment-protective, high-quality and efficient worker's method are in the process of removing obstacles, and it is less to consume energy, and little to ambient influnence, speed of application is fast, and can guarantee construction quality.(5) fast, economical, reduce this worker of construction costs method remove obstacles impinging earth strata and piece stone; Compare other job practices, receive the environmental factor restriction little, need not to increase other supporting facility; The efficiency of construction of pile pulling of removing obstacles is high, risk is low, has good economic benefit.
The present invention has that equipment is simple, cost is low, safe, construction is fast, advantage such as have fewer environmental impacts provides new processing approach for underground constructions such as shield structure, push pipe run into obstruction, has a broad prospect of the use.
Description of drawings
Fig. 1 is that precedence diagram is beaten in punching stake jumping, wherein: 1 to 30 an expression stake item;
Fig. 2 is a punching pile constructing process flow chart.
The specific embodiment
Shield structure of the present invention is met the rock stratum section punching job practices of removing obstacles:
(1) confirm that the punching construction area of removing obstacles is full section punching construction, stake position, hole overlap joint, a stake end absolute altitude are lower than absolute altitude at the bottom of the shield tunnel, and confirm later stage punching stake width range according to result of detection and the actual grade that combines the construction of punching in advance.
The punching regional extent of removing obstacles is 41 * 8m like the tunnel, and the punching scope of removing obstacles in 2# tunnel is 10 * 8m.The scene can be according to the adjustment of actual punching condition of construction remove obstacles length and width, if scar has been lower than and can have stopped punching at the bottom of the tunnel and remove obstacles, but is purpose to reach shield machine mud extraction driving promptly.
The consideration punching may be left over rock and the ratchel of not cleaning out, and influences later stage shield-tunneling construction driving; The punching construction area of removing obstacles is full section punching construction, stake hole 1 to position, 30 hole, stake hole overlap joint (Fig. 1).Construction stake top mark height is+4.00m, and a stake end absolute altitude is lower than absolute altitude 0.8m (considering pile bottom sediment and certain surplus) at the bottom of the shield tunnel, and the stake footpath be 1.00m, same campshed body overlap joint 0.20m, and row is 0.3m with campshed body overlap joint.The punching length of removing obstacles in 1# tunnel is 41m, and the punching length of removing obstacles in 2# tunnel is 10m.The punching width of removing obstacles is 8m, because of tunnel bottom is a circular arc, will in work progress, carries out the rock stratum absolute altitude and survey the cross section, and according to result of detection and combine the actual grade of the construction of punching in advance to confirm later stage punching stake width range, thus minimizing punching engineering quantity.
(2) concrete pouring of punched hole piles technology (Fig. 2) is used for reference in the punching construction of removing obstacles, different with it identical be pore-forming after, employing underwater grouting backfill, no descending reinforcing cage and concrete pouring operation.
Adopt flyash to add cement, sand, water and be mixed with fast rigid slurries and carry out under water tremie method and press and annotate, and add an amount of Admixture, proportioning is confirmed through test.
For satisfying the requirement of full section punching construction and shield driving construction, the slurries of filling after the punching need reach the standard that pile-forming speed is fast, later strength is low.Grout coordinate ratio will confirm that intensity was no more than 3MPa after plan reached the 28 day length of time, reached 0.3 ~ 0.5MPa after 3 days based on test.
Slurries adopt under water tremie method to press and annotate, and proportion must be greater than the proportion of mud, field monitoring, and the scene according to circumstances is provided with mixing platform and relevant device, adopts to mix the slurry system and directly press the method construction of annotating fast rigid slurries through conduit under water.
Grout coordinate ratio will adopt following two kinds of proportionings to make an experiment, and adjust according to result of the test, to satisfy construction requirement according to confirming after the field trial.
Test proportioning one is following:
| Cement (Kg/m 3） | Yellow ground (Kg/m 3） | Flyash (Kg/m 3） | Water glass (Kg/m 3） | Water (Kg/m 3） |
| 160 | 510 | 460 | 50 | 480 |
Test proportioning two is following:
| Cement (Kg/m 3） | Yellow ground (Kg/m 3） | Flyash (Kg/m 3） | Water glass (Kg/m 3） | Water (Kg/m 3） |
| 140 | 715 | 468 | 40 | 420 |
(3) punching was adopted and is jumped pile constructing process during punching was removed obstacles and constructed, that is: same row jumps a pile, the construction of different row's jumping one campshed
In the pile hole construction process, the hole phenomenon that possibly occur collapsing, pile monkey slip in the adjacent holes of accomplishing of constructing, can't accomplish this punching; Or occur the rock in this hole is poured in the adjacent holes of accomplishing of constructing, thereby can't reach the effect of removing obstacles.For solving above-mentioned construction worry, the punching construction is adopted and is jumped pile constructing process, that is: same row jumps a pile, and different rows jump campshed construction;
(4) punching projected depth and verticality control
Being the main points of construction control, also is the emphasis of inspection of quality, need to strengthen telling somebody what one's real intentions are and the quality control dynamics, and as the point control to be checked of stopping work.
(5) construction process control main points:
1), rig location should be accurately, level, firmly, the allowable variation at bit central and casing center should be greater than 20mm.Wire rope and drill bit center of gravity should remain on the same plumb line in the pore forming process, guarantee that drill bit creeps under the state that hangs tight.
2), in the drilling process, every drilling depth 5m-8m should check bore position, bore diameter, vertical degree.Checking tool can be used the round bar cage, and (D outer diameter equals design stake footpath; Highly be 4.5m) hang in the hole; Make large carrying food-basket center and drill center compound,, explain that then bore diameter meets the requirements with vertically spending as all there not being the resistance of extension up and down everywhere; Bore position with the total powerstation inspection, is then checked with fender pile bolt cross rope later on after the stake Kongzui is just about drilling depth 5m.
3), when stopping boring for some reason in the boring procedure, answer the water level that has regulation in the retaining hole and the mud relative density and the viscosity of requirement.
4), pore-forming to projected depth, hole depth is checked, after confirming to adhere to specification, can carry out the next process construction; The aperture of should taking measures to protect simultaneously prevents that foreign material from falling in the hole.
5), impact holing should be observed following regulation:
Should hang down when 1. beginning to impact basement rock that hammer is close to be hit or be interrupted impact, in order to avoid deflection.As find hole scattering, the backfill slabstone is to inclined to one side Kong Chu top 0.3 ~ 0.5M, impact holing again immediately.
Can suitably throw when 2. meeting arc stone and fill out the similar slabstone of hardness, use tension weight churning, or heavily low stroke alternately impinge.Big arc stone smashed clamp-on hole wall.
3. must accurately control slack rope length, the hammer of avoiding fanning the air.Generally should not use high-stroke, in order to avoid the disturbance hole wall causes the hole that collapses, reaming or lock of tool drilling.
4. answer the abrasion condition of running check wire rope, whether buckle tightness, transfer be flexible, with the brill that omits.
5. answer the abrasion condition of running check drill hammer, as it is excessive to wear and tear, will in time changes repairing when the cutting angle is undesirable, to improve drilling efficiency and to prevent accidents such as stick of tool, bit freezing.
6), in the punching stake pore forming process if find inclined hole, the hole or around casing, emit situation such as slurry and land subsidence of collapsing, should stop into brill, after taking following effective measures, can continue construction.
1. when bore inclining, cleaning bottom of hole correction repeatedly, as correct invalidly, backfill clay or weathering sillar creep into to Kong Chu top 0.5m partially more again in the Ying Zaikong;
2. like the hole of collapsing, should stop immediately to bore in creeping into, and the backfill clay, treat that hole wall bores after stable again;
3. emit slurry around the casing, available straw is mixed yellow mud and is stopped up a loophole, and presses one deck mud, Sha Bao.
7), if meet bit freezing, fall to bore, should handle by following method:
1. should replace tight rope, slack rope during bit freezing, drill bit is slowly sling, must not propose wrench firmly, can use shop assistant engineer's tools such as recovery hook, jack to help in case of necessity and carry;
Should salvage immediately when 2. falling to bore, hook the preset salvaging ring of drill bit, put on drill bit come with recovery hook.
8), the hole quality standard should meet the regulation of following table
Claims (5)
1. a shield structure is met the rock stratum section punching job practices of removing obstacles; It is characterized in that: confirm that at first the punching construction area of removing obstacles is full section punching construction; Stake position, hole overlap joint, a stake end absolute altitude are lower than absolute altitude at the bottom of the shield tunnel, and confirm later stage punching stake width range according to result of detection and the actual grade that combines the construction of punching in advance; Adopt punching pouring pile hole construction technology to carry out the punching construction of removing obstacles then, punching is removed obstacles and is accomplished the back and conduit is carried out under water in the punching stake directly press the fast rigid slurries backfill of notes.
2. shield structure according to claim 1 is met the rock stratum section punching job practices of removing obstacles, and it is characterized in that: the said punching punching of removing obstacles in the construction is adopted and is jumped pile constructing process, that is: same row jumps a pile, and different rows jump campsheds construction.
3. shield structure according to claim 1 is met the rock stratum section punching job practices of removing obstacles; It is characterized in that: the allowable variation≤20mm at punching bit central and casing center during said punching is removed obstacles and constructed; Wire rope and drill bit center of gravity should remain on the same plumb line in the pore forming process, guarantee that drill bit creeps under the state that hangs tight.
4. shield structure according to claim 1 is met the rock stratum section punching job practices of removing obstacles, and it is characterized in that: said punching is removed obstacles in the impact holing process of construction:
Should hang down when (1) beginning to impact basement rock that hammer is close to be hit or be interrupted impact, in order to avoid deflection.
5. as finding hole scattering, the backfill slabstone is to Kong Chu top 0.3 ~ 0.5m, impact again partially immediately;
Can suitably throw when (2) meeting arc stone and fill out the similar slabstone of hardness, use tension weight churning, or heavily hang down the stroke alternately impinge, big arc stone smashed clamp-on hole wall;
(3) accurately control slack rope length, the hammer of avoiding fanning the air;
(4) when bore inclining, need cleaning bottom of hole correction repeatedly, as correct invalidly, backfill clay or weathering sillar creep into impact more again to Kong Chu top 0.5m partially in the Ying Zaikong;
(5) in the pore-forming like the hole of collapsing, should stop immediately to bore, and the backfill clay, treat that hole wall impacts after stable again;
When (6) emitting slurry around the casing, mix yellow mud with straw and stop up a loophole, and press one deck mud, Sha Bao.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103161476A (en) * | 2012-10-26 | 2013-06-19 | 中铁隧道集团有限公司 | Mechanical shaft-forming method of shield cutterhead maintenance shaft in tunnel and underground construction |
| CN103967001A (en) * | 2013-01-25 | 2014-08-06 | 深圳市勘察测绘院有限公司 | Hole-forming construction method for punching pile |
| CN104452593A (en) * | 2014-10-24 | 2015-03-25 | 中铁四局集团有限公司 | Cast-in-situ bored pile jump hole symmetrical pore-forming construction process for side edge of high-speed rail high pier |
| CN108385694A (en) * | 2018-03-12 | 2018-08-10 | 中国建筑局（集团）有限公司 | Construction method for secant pile encountering deep underground obstacle |
| CN108756748A (en) * | 2018-05-25 | 2018-11-06 | 上海市机械施工集团有限公司 | The sweep-out method of underground obstacle |
| CN108756896A (en) * | 2018-05-25 | 2018-11-06 | 上海市机械施工集团有限公司 | The method for removing underground obstacle |
| CN109989409A (en) * | 2019-03-22 | 2019-07-09 | 上海长凯岩土工程有限公司 | Building enclosure soil layer underground cavity is removed obstacles method |
| CN110630271A (en) * | 2019-09-09 | 2019-12-31 | 中国电建集团铁路建设有限公司 | Construction method for water-rich sand layer shield to penetrate through steel pipe soil nail area |
| CN110985071A (en) * | 2019-12-31 | 2020-04-10 | 四川交投建设工程股份有限公司 | Active highway tunnel disease comprehensive treatment structure and construction method |
| CN111706347A (en) * | 2020-06-19 | 2020-09-25 | 中建富林集团有限公司 | Reverse obstacle clearing construction method for jacking pipe |
| CN114753381A (en) * | 2022-05-23 | 2022-07-15 | 中铁七局集团郑州工程有限公司 | Method for clearing underground obstacles in non-excavation construction path range in limited space |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103161476B (en) * | 2012-10-26 | 2014-05-21 | 中铁隧道集团有限公司 | Mechanical shaft-forming method of shield cutterhead maintenance shaft in tunnel and underground construction |
| CN103161476A (en) * | 2012-10-26 | 2013-06-19 | 中铁隧道集团有限公司 | Mechanical shaft-forming method of shield cutterhead maintenance shaft in tunnel and underground construction |
| CN103967001A (en) * | 2013-01-25 | 2014-08-06 | 深圳市勘察测绘院有限公司 | Hole-forming construction method for punching pile |
| CN104452593A (en) * | 2014-10-24 | 2015-03-25 | 中铁四局集团有限公司 | Cast-in-situ bored pile jump hole symmetrical pore-forming construction process for side edge of high-speed rail high pier |
| CN104452593B (en) * | 2014-10-24 | 2016-06-01 | 中铁四局集团有限公司 | Cast-in-situ bored pile jump hole symmetrical pore-forming construction process for side edge of high-speed rail high pier |
| CN108385694A (en) * | 2018-03-12 | 2018-08-10 | 中国建筑局（集团）有限公司 | Construction method for secant pile encountering deep underground obstacle |
| CN108756896B (en) * | 2018-05-25 | 2020-12-01 | 上海市机械施工集团有限公司 | Method for removing underground obstacle |
| CN108756748A (en) * | 2018-05-25 | 2018-11-06 | 上海市机械施工集团有限公司 | The sweep-out method of underground obstacle |
| CN108756896A (en) * | 2018-05-25 | 2018-11-06 | 上海市机械施工集团有限公司 | The method for removing underground obstacle |
| CN108756748B (en) * | 2018-05-25 | 2020-12-01 | 上海市机械施工集团有限公司 | Method for removing underground obstacle |
| CN109989409A (en) * | 2019-03-22 | 2019-07-09 | 上海长凯岩土工程有限公司 | Building enclosure soil layer underground cavity is removed obstacles method |
| CN110630271B (en) * | 2019-09-09 | 2020-11-20 | 中国电建集团铁路建设有限公司 | Construction method for water-rich sand layer shield to penetrate through steel pipe soil nail area |
| CN110630271A (en) * | 2019-09-09 | 2019-12-31 | 中国电建集团铁路建设有限公司 | Construction method for water-rich sand layer shield to penetrate through steel pipe soil nail area |
| CN110985071A (en) * | 2019-12-31 | 2020-04-10 | 四川交投建设工程股份有限公司 | Active highway tunnel disease comprehensive treatment structure and construction method |
| CN110985071B (en) * | 2019-12-31 | 2021-02-09 | 四川交投建设工程股份有限公司 | Active highway tunnel disease comprehensive treatment structure and construction method |
| CN111706347A (en) * | 2020-06-19 | 2020-09-25 | 中建富林集团有限公司 | Reverse obstacle clearing construction method for jacking pipe |
| CN111706347B (en) * | 2020-06-19 | 2021-08-20 | 中建富林集团有限公司 | Reverse obstacle clearing construction method for jacking pipe |
| CN114753381A (en) * | 2022-05-23 | 2022-07-15 | 中铁七局集团郑州工程有限公司 | Method for clearing underground obstacles in non-excavation construction path range in limited space |
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Application publication date: 20120905 |