CN103899325A - Construction method for shield machine to enter hole to receive concrete box - Google Patents
Construction method for shield machine to enter hole to receive concrete box Download PDFInfo
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- CN103899325A CN103899325A CN201410165799.XA CN201410165799A CN103899325A CN 103899325 A CN103899325 A CN 103899325A CN 201410165799 A CN201410165799 A CN 201410165799A CN 103899325 A CN103899325 A CN 103899325A
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Abstract
The invention discloses a construction method for a shield machine to enter a hole to receive a concrete box. The method includes the following steps that one concrete box is constructed in a shield machine receiving well; a hole door is broken by the shield machine, and tunneling is stopped; the concrete box is filled with backfill materials; the backfill materials are tunneled by the shield machine till the backfill materials enter the concrete box; the hole door is blocked; the concrete box is broken. Due to the fact that one concrete box is constructed in the receiving well, the concrete box is filled with the backfill mediums, the backfill mediums are tunneled by the shield machine and enter the box, earth pressure balance in construction for the shield machine to enter the hole for receiving is well kept, earth collapse is prevented, a construction technology applicable to complex surroundings and geological conditions is provided, and with the construction technology, the shield machine can safely and reliably enter the hole for receiving under various structural conditions.
Description
Technical field
The shield the present invention relates in a kind of shield method tunnel construction receives construction, the construction method that especially a kind of concrete casing shield receives
Background technology
In shield method tunnel construction, as a larger risk source, shield receives the safety that the success or not of constructing is related to surrounding enviroment or even tunnel.Especially receive construction for carrying out dark earthing, watery under complicated surrounding enviroment better and entering hole with the arenaceous stratum of pressure-bearing property, its risk is self-evident.
At present, the inherent reply of industry excessive risk arenaceous stratum enters hole and receives construction and mainly contain in water, to enter hole and receive construction technology and steel bushing and enter hole and receive construction technology.Specific implementation and step are as follows:
1, in water, enter hole and receive construction technology:
In water, enter hole and receive the main mode of passing through the interior backfill of well and water of construction technology realization, guarantee inside and outside Water And Earth Pressures balance in shield process, avoid the generation of soil erosion phenomenon.Control emphasis and be back soil property amount and compactness, the interior liquid level control of well and last portal shutoff.Its construction sequence as shown in Figure 1.
2, steel bushing enters hole reception construction technology:
Steel bushing enters hole and receives construction technology realization mainly by the mode of backfill or water in airtight steel bushing cabin, utilize the sealing performance of steel bushing and water, native Filled Dielectrics, in shield process, play interim portal plugging action, avoid soil erosion phenomenon to produce.The sealability control that control main points are steel bushing and last portal shutoff.Its construction sequence as shown in Figure 2.
At present, in water, enter hole receive construction technology and steel bushing enter hole receive construction technology excessive risk arenaceous stratum enter hole receive construction in successful Application, and Control Engineering is entered hole and is received construction risk effectively, but still has following problem:
1, in water, enter hole and receive construction technology
Its construction application has limitation, in receiver section structure under closed state, particularly cannot earthing under the state of hole circle superstructure plate in sealing to shield machine top 3m compacting;
Backfill earth volume is larger, and backwater and the cycle of drawing water are longer, and efficiency of construction is lower;
Portal slip casting sealing difficulty is higher, if portal air bag cannot effectively seal generation seepage, easily produces construction (draw water, backwater) repeatedly, and construction period lengthens greatly;
If first advance, hole shield structure is entering after hole receives to need to move to adjacent lines hole for hoist place and hang out, and because mid-board can not be abolished, the integral construction cycle also will lengthen.
2, steel bushing start tunneling technique
1) steel bushing deadweight is about 60T, and installation accuracy is higher, and construction period is longer.
2) in receiver section structure under closed state, steel bushing needs first after the assembled moulding in advance of hole for hoist place, move to the secretly section of burying hole circle place, construction period is longer;
3) enclose superstructure plate in hole under closed state, and obstruction clearance criteria is restricted, the welded closure sealing difficulty of steel bushing transition rings and hole circle is higher;
4) if obstruction clearance criteria is restricted, cannot implement outer sealing up a door, if slip casting shutoff exists defect, air bag effectively to seal in the tunnel of sealing up a door in employing, the construction risk of sealing up a door is larger;
5) steel bushing Reusability, its sealability will be had a greatly reduced quality;
6) sealability of steel bushing general≤0.3MPa, the shield machine that is greater than 0.3MPa for periphery Water And Earth Pressures enters hole and receives and still have certain risk.
For above problem, object of the present invention aims to provide a kind of easy, effective, safe and reliable excessive risk arenaceous stratum that is adapted under complex environment and enters hole and receive construction method, adopt light-weight foamed native casing to enter hole and receive construction technology, solve the existing construction limitation of existing technique, risk control uncertainty and the lower problem of efficiency of construction.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of easy, effective, safe and reliable excessive risk arenaceous stratum that is adapted under complex environment to be entered hole and receives construction method, solves the construction method that the concrete casing shield of the problem that the existing construction limitation of existing technique, risk control uncertainty and efficiency of construction are lower receives.
For realizing above-mentioned technique effect, the invention discloses the construction method that a kind of concrete casing shield receives, comprise the following steps:
The concrete casing of constructing in shield structure received well;
Shield structure is abolished portal, stops driving;
In described concrete casing, fill backfilling material;
Backfilling material described in shield driving is until enter described concrete casing;
Portal described in shutoff;
Abolish described concrete casing.
The present invention further improves and is, the step of filling backfilling material in described concrete casing is further comprising the steps:
Construct at the top of described concrete casing at least one first construction hole;
In described concrete casing, fill described backfilling material by described the first construction hole.
The present invention further improves and is, the step of portal is further comprising the steps described in shutoff:
In described packing material, cut a hole and build formation one passage by described the first construction hole, complete described portal shutoff.
The present invention further improves and is, abolishing before described portal, in advance described portal place body of wall is carried out to vertical frozen reinforcing.
The present invention further improves and is, the step that described shield structure is abolished portal is further comprising the steps of:
Sidewall bottom construction one second construction hole at described concrete casing away from described portal one side;
Enter described concrete casing by described the second construction hole, complete portal and abolish disintegrating slag removing.
The present invention further improves and is, described the first construction hole and described the second construction hole adopt respectively steel deck-plate to seal.
The present invention further improves and is, described backfilling material is light-weight foamed concrete, and described light-weight foamed concrete water-cement ratio is 0.63, and compressive strength >=1MPa adopts concrete casing described in the backfill of placement layer by layer mode.
The present invention is owing to having adopted above technical scheme, making it have following beneficial effect is: by the concrete casing of constructing in received well, filled and process light weight concrete construction in this concrete casing, the light-weight foamed concrete of shield driving cutting, finally enter concrete casing completely, light-weight foamed concrete can meet shield machine cutting requirement and load bearing requirements and recharge conveniently, keep well shield to receive the earth pressure balance in construction, prevent Study on Soil Collapse, provide a kind of be applicable under complicated surrounding enviroment and geological conditions can be under various structural conditions shield structure safe and reliable enter the construction technology that receives of hole.And in the top construction first construction hole of concrete casing, for light-weight foamed concrete build and cut a hole build portal and abolish passage.In the sidepiece construction second construction hole of concrete casing, be convenient to after portal is abolished, carry out portal and abolish disintegrating slag removing.
The present invention further improves and is, adopts the mode of placement layer by layer in described concrete casing, to fill described light-weight foamed concrete, and described light-weight foamed concrete water-cement ratio is 0.63, compressive strength >=1MPa.Every one deck can start to build after needing to wait for last layer initial set (being about 3 hours) after having built, to guarantee that light-weight foamed concrete filling can meet shield machine cutting requirement and load bearing requirements.
The present invention further improves and is, the shield tail of described shield structure adopts the back of the body to cover steel plate and described portal hole circle is tightly connected.
The present invention further improves and is, sets up injected hole in entering on receiver section section of jurisdiction, hole of described shield structure, departs from after described portal at described shield structure shield tail, carries out hoop slip casting shutoff in tunnel by described injected hole.
Accompanying drawing explanation
Fig. 1 abolishes the schematic diagram before portal in the construction method that receives of concrete casing shield of the present invention.
Fig. 2 abolishes the schematic diagram after portal in the construction method that receives of concrete casing shield of the present invention.
Fig. 3 is the schematic diagram after casing backfill in the construction method that receives of concrete casing shield of the present invention.
Fig. 4 is that in the construction method that receives of concrete casing shield of the present invention, shield tail departs from the schematic diagram after portal.
Fig. 5 is the top view of Fig. 4.
Fig. 6 is the lateral plan of Fig. 4.
Fig. 7 is the schematic diagram of portal shutoff passage in the construction method that receives of concrete casing shield of the present invention.
Fig. 8 is the formation schematic diagram of portal shutoff passage in the construction method that receives of concrete casing shield of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing and the specific embodiment, the present invention is further detailed explanation.
First consult shown in Fig. 1 and Fig. 2, the construction method that concrete casing shield of the present invention receives mainly adopts closed concrete casing 11 modes to implement shield and receives, at the interior construction one concrete casing 11 of received well 21, coordinate shown in Fig. 3, in concrete casing 11, be filled with light-weight foamed concrete 12, light-weight foamed concrete 12 is built maintenance and is reached compressive strength >=1MPa after 3 days, meets the cutting of shield structure and requirement for bearing capacity, implements backfill operation after portal 13 is abolished.In conjunction with shown in Fig. 4～6, after the intensity index of light-weight foamed concrete 12 reaches designing requirement, come into effect shield structure 14 and enter hole reception operation again.The light-weight foamed concrete 13 of shield structure 14 low speed pressurize driving cutting enters concrete casing 11, deviate from after portal 13 meets portal shutoff space to stop advancing at shield tail, detect after leakproof through hoop slip casting shutoff operation in tunnel and portal, as shown in Figure 7 and Figure 8, implement portal shutoff from the construction hole 16 on casing 11 tops, after portal shutoff completes, carried out again casing and abolish.
Specifically comprise following construction sequence:
S001: concrete box system is done and reserved construction hole is arranged
Consult shown in Fig. 1, concrete casing 11 structures are according to the design of shield machine 10000KN gross thrust, and employing is set up wall body mode and is connected with existing received well structure, and design wall body thickness is 60cm.Concrete casing 11 texture edges and Facad structure sideline and shield structure 14 outer edge clear distance >=1m, control casing 11 top boards and shield structure 14 top headway >=40m, as shown in Fig. 3～5, Specific construction can utilize structure side wall and the upper structural slab of portal hole circle to consider according to received well form of structure and arrange casing 11, casing 11 pouring constructions and received well structure construction are built simultaneously, directly build on the sidewall and portal 13 place bodies of wall that forms in received well.
Simultaneously, consider that light-weight foamed concrete 12 of later stage recharges and portal 13 plugging constructions, reserve the construction hole 16 of two 1.5m × 1.5m near portal 13 circle places, hole at casing 11 tops, reserved construction hole 16 center to center distance are 3m, as shown in Figure 4, build as light-weight foamed concrete 12 and portal 13 plugging construction holes.Concrete casing 11 away from a side sidewall of portal 13 on reserved 1.5m × 1m hole 17 of construct, cut disintegrating slag as portal and remove use.The reserved construction of all casings hole all adopts the thick steel deck-plate sealing of 2cm, and reserved 1 cun of ball valve Emergency use.
S002: shield structure is abolished portal, stops driving;
Before portal 13 is abolished, in advance the body of wall at portal 13 places is carried out to vertical frozen reinforcing, abolish so that realize portal, can not affect periphery body of wall.Adopt pipeline to carry out body of wall and freeze, after having freezed, pull out and freeze pipeline, freeze tube drawing and need meet two conditions:
(1) shield machine otch has arrived 2m outside sideline, consolidation by freezing district;
(2) light-weight foamed concreting completes and initial set.
Shown in Fig. 2, shield structure 14 stops driving after abolishing portal 13, by the preliminary shutoff portal of shield structure structure, enters concrete casing 11 by concrete casing 11 sidepieces near the construction hole 17 of bottom position, completes portal and abolishes disintegrating slag removing.
S003: light-weight foamed concrete casting
Consult shown in Fig. 3, cut after cleaning portal 13 is comminuted, must seal the construction hole 17 of casing 11 sidepieces, then start light-weight foamed concrete 12 backfill constructions.When light-weight foamed concrete 12 is made, adopt the mode of sending cement paste+on-the-spot foam generated+Admixture site pumping outside, roll without vibrating, directly carry out backfill by reserved construction hole 16, casing top by earth's surface by flexible pipe and build.Pouring construction adopts placement layer by layer mode, and 1m builds height as one deck, and every one deck can start to build after needing to wait for last layer initial set (being about 3 hours) after having built.The match ratio of light-weight foamed concrete 12 is as shown in table 1 below.
Table 1
In casting process, need inspect by random samples design wet density in start each time, departure is at 20kg/m3, and each LIFT is made to one group of resistance to compression test block, adopts equal maintenance method to carry out maintenance.
S004: shield driving backfilling material is until enter described concrete casing
Consult shown in Fig. 4～6, the light-weight foamed concrete of shield driving, enters concrete casing 11, and shield structure is in the interior boring parameter control of concrete casing 11 following several principles:
(1) otch arrives before light-weight foamed concrete, need be to carrying out intensity detection with supporting test block, intensity reach designing requirement >=can start to cut light-weight foamed concrete after 1MPa;
(2) soil pressure is set as calculating soil pressure 50% left and right, takes into account the amount of being unearthed and controls;
(3) advance gross thrust≤10000KN, fltting speed≤20mm/min;
(4) cutterhead moment of torsion≤2000KN.m;
(5) synchronous grouting is to control grouting pressure as main, be about 0.4～0.5MPa, synchronous grouting filling rate is 160% to be progressively reduced to 100% (now shield tail arrival point wall), and slurries type adopts the thick slurry of large proportion that adds cement, and cement mixed weight is about 50kg/m3;
(6) adopt bentonite slurry to carry out light-weight foamed soil cutting improvement, addition is just decided to be 30～40% of soil mass, plays and controls cutterhead moment of torsion, also can make shield structure cut the light-weight foamed soil getting off and have better stream plasticity and denseness simultaneously.
S005: shield structure shield tail is deviate from portal hole circle and controlled
Hole ring adopts the back of the body to cover steel plate (1cm is thick) ring, it is 30cm that shield machine shield tail is deviate from hole circle distance, calculate according to conventional three road shield ventral brush overall length 70cm, as protruded portal circle < 1m according to mileage calculation hole ring, for guaranteeing tail sealing effect, except the hole back of the body covers steel plate ring, need again an assembled ring domain section of jurisdiction.
S006: hoop slip casting plugging construction in tunnel
Enter hole receiver section 10 endless tube sheets and be all set to establish newly slip casting orifice ring, monocycle section of jurisdiction has 16 injected holes altogether.Hoop slip casting adopts biliquid slurry, grouting pressure control≤0.4MPa.Grouting sequence is by large ring number to little ring number, and from down to up, the quincunx pressure injection of ring is jumped at Fourth Ring, interval to monocycle.
S007: detection of grouting effects
After hoop mortar depositing construction completes, detection of grouting effects is carried out at point two positions.
(1) in tunnel: by adopting the impact drilling to ground-connecting-wall to carry out slip casting effect detection on the basis that installs ball valve additional to section of jurisdiction, ground-connecting-wall position injected hole.
(2) casing: by reserved construction hole ball valve, adopt the impact drilling mode to hole to the back of the body and cover steel plate anchor ring.
S008: portal plugging construction
Coordinate shown in Fig. 7 and Fig. 8, by detection of grouting effects, confirm to start portal shutoff work in leakproof situation.Portal shutoff is mainly by the reserved construction of two 1.5m × 1.5m hole 16, from top to bottom, adopt pneumatic pick to cut light-weight foamed concrete, in light-weight foamed concrete, cutter is built the portal shutoff passage 18 that forms track 1.5m width as shown by the arrows in Figure 8, while employing on steel plate synchronously all adopts curved plate when shutoff passage 18 forms, and (1cm is thick, 30cm width) portal circle and the hole ring back of the body is covered to steel plate adopt full weld to be welded into one, weld bead height >=10mm.
S009: casing is abolished
After portal shutoff completes, can start casing and abolish.While abolishing, casing and received well structure overlapping part adopt artificial chisel except mode, and other position and light-weight foamed concrete all can adopt small-sized pick machine to abolish.
The invention process excessive risk arenaceous stratum shield machine enters hole and receives stronger to the structural condition adaptive capacity of received well;
The present invention is without taking in a large number construction plant, and efficiency is higher, stronger to the control ability of risk;
Backfill medium is innovated, and making overall shield machine receive construction technology has had breakthrough.
Below embodiment has been described in detail the present invention by reference to the accompanying drawings, and those skilled in the art can make many variations example to the present invention according to the above description.Thereby some details in embodiment should not form limitation of the invention, the present invention by the scope defining using appended claims as protection scope of the present invention.
Claims (9)
1. the construction method that concrete casing shield receives, is characterized in that, described construction method comprises the following steps:
The concrete casing of constructing in shield structure received well;
Shield structure is abolished portal, stops driving;
In described concrete casing, fill backfilling material;
Backfilling material described in shield driving is until enter described concrete casing;
Portal described in shutoff;
Abolish described concrete casing.
2. construction method as claimed in claim 1, is characterized in that, the step of filling backfilling material in described concrete casing is further comprising the steps:
Construct at the top of described concrete casing at least one first construction hole;
In described concrete casing, fill described backfilling material by described the first construction hole.
3. construction method as claimed in claim 2, is characterized in that, the step of portal is further comprising the steps described in shutoff:
In described packing material, cut a hole and build formation one passage by described the first construction hole, complete described portal shutoff.
4. construction method as claimed in claim 3, is characterized in that, abolishing before described portal, in advance described portal place body of wall is carried out to vertical frozen reinforcing.
5. construction method as claimed in claim 4, is characterized in that, the step that described shield structure is abolished portal is further comprising the steps of:
Sidewall bottom construction one second construction hole at described concrete casing away from described portal one side;
Enter described concrete casing by described the second construction hole, complete portal and abolish disintegrating slag removing.
6. construction method as claimed in claim 5, is characterized in that: described the first construction hole and described the second construction hole adopt respectively steel deck-plate to seal.
7. construction method as claimed in claim 6, is characterized in that: described backfilling material is light-weight foamed concrete, and described light-weight foamed concrete water-cement ratio is 0.63, and compressive strength >=1MPa adopts concrete casing described in the backfill of placement layer by layer mode.
8. construction method as claimed in claim 7, is characterized in that: the shield tail of described shield structure adopts the back of the body to cover steel plate and described portal hole circle is tightly connected.
9. construction method as claimed in claim 8, is characterized in that: set up injected hole in entering on receiver section section of jurisdiction, hole of described shield structure, depart from after described portal at described shield structure shield tail, carry out hoop slip casting shutoff in tunnel by described injected hole.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104389619A (en) * | 2014-10-08 | 2015-03-04 | 海南大学 | Shield excess hole construction method |
| CN105908760A (en) * | 2016-04-15 | 2016-08-31 | 重庆燕皓建筑材料有限公司 | Tunnel backfill method utilizing vesicle mixing light soil |
| CN106907164A (en) * | 2017-03-27 | 2017-06-30 | 中铁隧道勘测设计院有限公司 | A kind of water-bed combination of mine shield tunnel docking structure form and its construction method |
| CN110159309A (en) * | 2019-05-27 | 2019-08-23 | 中国水利水电第八工程局有限公司 | A kind of construction method using foam concrete backfill Tunneling by mining method |
| CN110878697A (en) * | 2019-12-10 | 2020-03-13 | 济南轨道交通集团有限公司 | Shield underwater receiving method next to urban main road in high-water-rich sandy gravel stratum |
| CN113338970A (en) * | 2021-07-16 | 2021-09-03 | 中天建设集团有限公司 | Shield receiving method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104389619A (en) * | 2014-10-08 | 2015-03-04 | 海南大学 | Shield excess hole construction method |
| CN105908760A (en) * | 2016-04-15 | 2016-08-31 | 重庆燕皓建筑材料有限公司 | Tunnel backfill method utilizing vesicle mixing light soil |
| CN106907164A (en) * | 2017-03-27 | 2017-06-30 | 中铁隧道勘测设计院有限公司 | A kind of water-bed combination of mine shield tunnel docking structure form and its construction method |
| CN110159309A (en) * | 2019-05-27 | 2019-08-23 | 中国水利水电第八工程局有限公司 | A kind of construction method using foam concrete backfill Tunneling by mining method |
| CN110159309B (en) * | 2019-05-27 | 2021-03-23 | 中国水利水电第八工程局有限公司 | Construction method for backfilling mine method tunnel with foam concrete |
| CN110878697A (en) * | 2019-12-10 | 2020-03-13 | 济南轨道交通集团有限公司 | Shield underwater receiving method next to urban main road in high-water-rich sandy gravel stratum |
| CN113338970A (en) * | 2021-07-16 | 2021-09-03 | 中天建设集团有限公司 | Shield receiving method |
| CN113338970B (en) * | 2021-07-16 | 2024-03-19 | 中天建设集团有限公司 | Shield receiving method |
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Effective date of registration: 20151217 Address after: 200232 Shanghai city Xuhui District Wanping Road No. 1099 5 floor Applicant after: SHANGHAI TUNNEL ENGINEERING CO., LTD. Applicant after: SHANGHAI TUNNEL ENGINEERING CO., LTD. Applicant after: Shanghai tunneling shield Engineering Co., Ltd Address before: 200082 No. 118, Dalian Road, Shanghai, Yangpu District Applicant before: Shanghai Tunnel Engineering Co., Ltd. Applicant before: Shanghai tunneling shield Engineering Co., Ltd |
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