CN204112334U - Reserved shield crossing combined type foundation pit exterior-protected device - Google Patents

Reserved shield crossing combined type foundation pit exterior-protected device Download PDF

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Publication number
CN204112334U
CN204112334U CN201420357878.6U CN201420357878U CN204112334U CN 204112334 U CN204112334 U CN 204112334U CN 201420357878 U CN201420357878 U CN 201420357878U CN 204112334 U CN204112334 U CN 204112334U
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China
Prior art keywords
diaphragm
axes agitating
pile
agitating pile
shaped steel
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CN201420357878.6U
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Chinese (zh)
Inventor
楼岱
许文明
徐乐勇
胡宝杰
潘林彬
曹磊
傅珺
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Hongrun Construction Group Co Ltd
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Hongrun Construction Group Co Ltd
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Abstract

The utility model discloses a kind of reserved shield crossing combined type foundation pit exterior-protected device, comprising: diaphragm wall; Three axes agitating pile, is positioned at the outside of diaphragm wall and interpolation shaped steel; High-pressure rotary jet grouting pile, is filled between three axes agitating pile and diaphragm wall; And the compound Guan Liang for three axes agitating pile and diaphragm wall are fixed together, formed by the steel concrete closed, be arranged on three axes agitating pile and diaphragm wall top, wherein, in unreserved shield crossing part, on bearing of trend straight down, the degree of depth of three axes agitating pile is consistent with the diaphragm wall degree of depth; In reserved shield crossing part, on bearing of trend straight down, diaphragm wall is more shallow than three axes agitating pile, and the high-pressure rotary jet grouting pile be filled between three axes agitating pile and diaphragm wall exceeds diaphragm wall downwards and is positioned at inside three axes agitating pile.The rigidity of device of the present utility model is large, intensity is high, safety is good, is extremely conducive to the risk control of deep pit digging.

Description

Reserved shield crossing combined type foundation pit exterior-protected device
Technical field
The utility model relates to a kind of reserved shield crossing combined type foundation pit exterior-protected device.
Background technology
Railway traffic engineering gauze constantly increases dilatation along with the whole development in city, and then form crisscross gauze layout, thus, because of planning successively problem, inevitably there is the situation that the circuit of construction in early stage can be able to have an impact to later stage planning and designing and construction.
It is comparatively ripe that Metro Deep Excavation goes along with sb. to guard him construction existing construction, plant equipment and technical level.When running into reserved shield crossing condition, go along with sb. to guard him form then varied, current domestic routine adopts three kinds of forms, be glass fiber-reinforced polymer diaphragm wall, TRD engineering method wall, SWM engineering method wall respectively, what wherein adopt glass fiber-reinforced polymer form needs the cost plenty of time to go to cut concrete wall in the practice middle and later periods; The stake of TRD engineering method is used seldom at home, and market environment is immature, and the duration does not reach requirement, and cost is comparatively high; The stake of SMW engineering method can be used in more shallow, the junior foundation pit construction of deep pit monitor, complicated for surrounding enviroment, require that higher place is inapplicable.
Therefore, be necessary to provide a kind of reserved shield crossing combined type foundation pit exterior-protected device that can overcome above-mentioned shortcoming.
Utility model content
The one that the utility model provides the shortcoming that can overcome above-mentioned prior art reserves shield crossing combined type foundation pit exterior-protected device, its rigidity is large, intensity is high, safety is good, extremely be conducive to the risk control of deep pit digging, be applicable to such as all subway foundation pits and go along with sb. to guard him the deep foundation ditch structural envelope built foundation ditch with room, particularly have planning subway line under it.
The wall formation principal of reserved shield crossing combined type foundation pit exterior-protected device of the present utility model is the Two walls unite as one of short diaphragm wall and deep layer SMW engineering method wall, namely, when ensureing excavation of foundation pit under the homeostatic precondition of body of wall, reduce the building-in depth of diaphragm wall body, recycling deep layer SMW engineering method wall blocks the artesian aquifer that should be cut off by diaphragm wall, treat that Underground Construction completes the shaped steel pulled out in composite wall, finally pass through combined wall by shield structure or other construction machineries.
The effect of diaphragm wall is continuity and the globality of guaranteeing whole foundation pit enclosure structure, effectively can ensure the intensity of composite wall body of wall simultaneously.
Adopt high-pressure rotary jet grouting pile to fill completely between short diaphragm wall and deep layer SMW engineering method wall, strengthen globality and the water resistance of composite wall; At composite wall front needle, expanded letter Guan Liang is designed to diaphragm wall and SMW engineering method wall, ensure Two walls unite as one.
The purpose of this utility model is realized by the reserved shield crossing combined type foundation pit exterior-protected device of following structure: a kind of reserved shield crossing combined type foundation pit exterior-protected device, comprising: diaphragm wall; Three axes agitating pile, described three axes agitating pile is positioned at the outside of described diaphragm wall, and described three axes agitating pile interpolation shaped steel; High-pressure rotary jet grouting pile, described high-pressure rotary jet grouting pile is filled between described three axes agitating pile and described diaphragm wall; And the compound Guan Liang for described three axes agitating pile and described diaphragm wall are fixed together, described compound Guan Liang is formed by the steel concrete closed, and is arranged on the top of described three axes agitating pile and described diaphragm wall,
Wherein, in unreserved shield crossing part, on bearing of trend straight down, the degree of depth of described three axes agitating pile is consistent with the described diaphragm wall degree of depth; In reserved shield crossing part, on bearing of trend straight down, described diaphragm wall is more shallow than described three axes agitating pile, and the high-pressure rotary jet grouting pile be filled between described three axes agitating pile and described diaphragm wall exceeds described diaphragm wall downwards and is positioned at inside described three axes agitating pile.
Alternatively, described shaped steel adopts whole timber.
Alternatively, described shaped steel adopts segmentation welding, and the position in the vertical direction of the joint of adjacent described shaped steel welding staggers mutually, and the distance that staggers is not less than 1m.
Preferably, described shaped steel is coated with anti-friction agent.
According to another embodiment, described shaped steel is pulled out.
Subterranean wall projected depth should consider the high and excavation of foundation pit degree of depth of the top mark in reserved shield crossing tunnel, advises the degree of depth at the bottom of the short ground wall >=excavation of foundation pit degree of depth+2.5m under normal circumstances, ensures the top depth >=excavation of foundation pit degree of depth+6m of shield crossing simultaneously.The projected depth of ultra-deep three axes agitating pile interpolation shaped steel should be considered to cut off relevant artesian aquifer and toe of wall and to fall the soil layer of toe, the diaphragm wall degree of depth of the usual suggestion three axes agitating pile degree of depth and unreserved shield crossing part is consistent, and shaped steel inserts absolute altitude suggestion and is greater than absolute altitude 0.8m ~ 1.0m at the bottom of three axes agitating pile stake.Three axes agitating pile design thickness is generally thought of as 1000mm, specifically adjusts according to insertion depth.
Reserved shield crossing combined type foundation pit exterior-protected device rigidity of the present utility model is large, intensity is high, safety good, and it is simple and easy to construct, extremely be conducive to the risk control of deep pit digging, also there is the advantage that construction cost is low, safety is good, be applicable to such as all subway foundation pits and go along with sb. to guard him the deep foundation ditch structural envelope built foundation ditch with room, particularly have planning subway line under it.
Accompanying drawing explanation
Fig. 1 is the sectional view vertically of the reserved shield crossing combined type foundation pit exterior-protected device according to an embodiment of the present utility model, it illustrates reserved shield crossing part; And
Fig. 2 forms the construction flow chart according to reserved shield crossing combined type foundation pit exterior-protected device of the present utility model.
Fig. 3 a-3f respectively illustrates the schematic diagram formed according to the corresponding construction sequence of the construction of reserved shield crossing combined type foundation pit exterior-protected device of the present utility model.
Detailed description of the invention
Fig. 1 is the sectional view vertically showing reserved shield crossing part according to reserved shield crossing combined type foundation pit exterior-protected device of the present utility model.
As shown in fig. 1, wherein a kind of reserved shield crossing combined type foundation pit exterior-protected device 10 comprises: diaphragm wall 1; Three axes agitating pile 2, it is positioned at the outside of described diaphragm wall, and this three axes agitating pile interpolation shaped steel 3; High-pressure rotary jet grouting pile 4, it is filled between three axes agitating pile 2 and diaphragm wall 1; And the compound hat beam 5 for three axes agitating pile and diaphragm wall are fixed together, this compound hat beam 5 is formed by the steel concrete closed, and is arranged on the top of three axes agitating pile and diaphragm wall.It is reserved shield crossing part shown in Fig. 1, can find out that diaphragm wall 1 is more shallow than three axes agitating pile 2 on bearing of trend straight down, the high-pressure rotary jet grouting pile 4 be filled between three axes agitating pile 2 and diaphragm wall 1 exceeds diaphragm wall 1 downwards and is positioned at inside three axes agitating pile 2.And at unreserved shield crossing part (not shown), on bearing of trend straight down, the degree of depth of three axes agitating pile is consistent with the diaphragm wall degree of depth.
According to one embodiment of present invention, described shaped steel adopts whole timber.
According to another embodiment of the invention, described shaped steel adopts segmentation welding, and the position in the vertical direction of the joint of adjacent described shaped steel welding staggers mutually, and the distance that staggers is not less than 1m.
Preferably, described shaped steel is coated with anti-friction agent.
According to another embodiment, described shaped steel is pulled out, and pulls out in the space that shaped steel reserves and is filled with mud.
Fig. 2 shows the construction flow process formed according to the reserved shield crossing combined type foundation pit exterior-protected device of an embodiment of the present utility model, wherein, in step S1, carries out preparation of construction; In step S2, carry out construction of diaphragm wall; In step S3, outside diaphragm wall, carry out three axes agitating pile become wall to construct; In step S4, carry out the installation of shaped steel; In step S5, carry out high-pressure rotary jet grouting pile filling; In step S6, carry out the making of Guan Liang; In step S7, carry out construction monitoring and excavation of foundation pit and structure construction; In step S8, carry out pulling out of shaped steel; At S9, carry out backfill grouting.
Corresponding construction sequence below in conjunction with Fig. 3 a-3f illustrates the construction formed according to reserved shield crossing combined type foundation pit exterior-protected device of the present utility model.
s1, preparation of construction
Before carrying out the construction of combined type bracing of foundation pit wall, must conscientiously investigate job site situation and engineering geology, hydrological geological conditions, to guarantee carrying out smoothly of construction.
s2, construction of diaphragm wall
Be construction of diaphragm wall schematic diagram as shown in Figure 3 a.
The effect of diaphragm wall is continuity and the globality of guaranteeing whole foundation pit enclosure structure, effectively can ensure the intensity of composite wall body of wall simultaneously.Diaphragm wall be manufactured with some basic demand:
1, diaphragm wall lead the initial period fairlead that wall is hydraulic grab grooving operation, must ensure that the vertical precision of the interior span width size and internal face leading wall reaches the requirement of relevant specification.
2, box cut section adopts groover grooving to cut the earth.Groover should be equipped with verticality Displaying Meter and automatic deviation rectifying device, guarantees to rectify a deviation in time, reaches best to make the track of cell wall.
3, ensure the brush wall time, check brush wall device, guarantee brush wall effect.
4, in diaphragm wall grooving process, the effect of mud is retaining wall, takes slag, cooling facility and cut soil lubrication, therefore selecting of mud is also very important.
5, after grooving to design elevation, with method measuring flume section sections such as ultrasonic wave, groove need be repaiied as error exceedes regulation; After this carry out the end clearly, sediment thickness should not exceed code requirement.
s3, deep layer three axes agitating pile
Be three axes agitating pile construction schematic diagram as shown in Figure 3 b.
1, the verticality of three axes agitating pile should not be greater than 1/200.
2, strict control whitewashing speed promotes (or sinking) speed with whitewashing, and the error of whitewashing and stirring hoisting velocity is not more than ± 0.1m/min.
3, the interval time of agitation pile lapping construction was no more than 24 hours, if because of the cold seam of time construction long generation interval time, high-pressure rotary-spray should be adopted to carry out reinforcement to cold seam in the high-pressure rotary-spray stage of filling.
Pile record sheet is filled in when 4, often organizing three axes agitating pile pile.
5, three axes agitating pile should adopt drill core test wall body integrality and uniaxial compressive strength test at design excavation the length of time.
the installation of S4, shaped steel
The making of shaped steel
1, shaped steel should adopt whole timber, stay in advance wear Duan Yinxu insert ultra-deep shaped steel time, when segmentation need be adopted to weld, should the strong weld such as groove be adopted.
2, welding point position should be avoided being arranged on diaphragm wall the foot of a wall position or the end, hole to hole end 3m scope.
3, adjacent shaped-steel joint vertical position should stagger mutually, and the distance that staggers should not be less than 1m.
4, in order to the later stage pulls out smoothly, interpolation shaped steel should smear anti-friction agent.
5, planeness and weldquality should be checked after ultra-deep shaped steel welding production, carry out after qualified measuring numbering.
6, the shaped steel after machining should in good order carrying out stack, the padded 25cm in bottom, with good conditionsi can covering protection.
As shown in Figure 3 c for shaped steel inserts construction schematic diagram.
1, ultra-deep shaped steel should check planeness, weldquality and anti-friction agent effect before inserting again, notes repairing in time.
2, ultra-deep shaped steel should insert in 30min after three axes agitating pile construction terminates.
3, according to the specification of ultra-deep shaped steel, the stirrup suspension member of corresponding shaped steel positioning guiding rack and vertical location is made.
4, the verticality of ultra-deep shaped steel should not be greater than 1/200.
5, ultra-deep shaped steel adopts crawler crane to coordinate three axle stake machines to rely on deadweight to insert people, vibrating hammer can be adopted at need to assist when being inserted with.
6, construction note is carried out after every root type steel installation.
s5, high-pressure rotary jet grouting pile are filled
As shown in Figure 3 d for high-pressure rotary-spray fills construction schematic diagram.
1, the quality of cement, outer ginseng agent etc. should be checked before construction, the performance etc. of the precision of stake position, pressure meter, flowmeter and sensitivity, high-pressure injection equipment.
2, applicable cases and the construction sequence of construction parameter (pressure, cement quality, hoisting velocity, rotary speed etc.) should be checked in construction.
3, in churning process, leakage amount should control between 10%-25%.To the operating mode needing to expand reinforcing scope or improve intensity, multiple spray measure can be taked.
4, construction terminates rear 28d, construction quality and bearing capacity are tested, content are strength of the mixing pile, bearing capacity, average diameter, pile body center, pile body uniformity etc.
the making of S6, Guan Liang
As shown in Figure 3 e for Guan Liang makes construction schematic diagram.
1, compound coping arranges closed steel concrete expanded letter Guan Liang, and shaped steel anchors into Guan Liang, adopts four limbs hoop to fix, and hat beam main tendon should be avoided shaped steel and arrange.
2, adopt cystosepiment to isolate between shaped steel and hat beam, and adopt asphaltic felt outsourcing waterproof.
3, Guan Liang builds between front shaped steel and should clean out.
s7, construction monitoring and excavation of foundation pit and structure construction
1, the monitoring of composite wall should be carried out immediately after construction terminates, and before excavation, monitored data can be not counted in foundation pit deformation monitoring form, but should add Primary Stage Data in actual excavation monitoring controls.
2, according to the length of reserved shield crossing section, suitable increase soil body deviational survey hole, advises that every 20m increases by a pair.
pulling out of S8, shaped steel
As illustrated in figure 3f for construction schematic diagram pulled out by shaped steel.
1, shaped steel rises to pull out and adopts hydraulic pressure to work the machine of pulling out.
2, shaped steel carries out measuring record after extracting, and checks insertion construction note, guarantees to pull out totally.
s9, backfill grouting
1, shaped steel should carry out backfill grouting after pulling out in time.
2, cement paste should once be pressed into continuously, must not interrupt; Grouting is first from thin pulp, enriching gradually.
3, slip casting filling rate should be determined according to the porosity of soil body depth of cracking closure, flow rate of grouting, the soil body and transmission coefficient etc.The once grouting pack completeness of saturated soft clay should not be greater than 0.15-0.17.

Claims (5)

1. a reserved shield crossing combined type foundation pit exterior-protected device, comprising:
Diaphragm wall;
Three axes agitating pile, described three axes agitating pile is positioned at the outside of described diaphragm wall, and described three axes agitating pile interpolation shaped steel;
High-pressure rotary jet grouting pile, described high-pressure rotary jet grouting pile is filled between described three axes agitating pile and described diaphragm wall; And
For the compound Guan Liang described three axes agitating pile and described diaphragm wall are fixed together, described compound Guan Liang is formed by the steel concrete closed, and is arranged on described three axes agitating pile and described diaphragm wall top,
Wherein, in unreserved shield crossing part, on bearing of trend straight down, the degree of depth of described three axes agitating pile is consistent with the described diaphragm wall degree of depth; In reserved shield crossing part, on bearing of trend straight down, described diaphragm wall is more shallow than described three axes agitating pile, and the high-pressure rotary jet grouting pile be filled between described three axes agitating pile and described diaphragm wall exceeds described diaphragm wall downwards and is positioned at inside described three axes agitating pile.
2. reserved shield crossing combined type foundation pit exterior-protected device as claimed in claim 1, is characterized in that: described shaped steel adopts whole timber.
3. reserved shield crossing combined type foundation pit exterior-protected device as claimed in claim 1, is characterized in that: described shaped steel adopts segmentation welding, and the position in the vertical direction of the joint of adjacent described shaped steel welding staggers mutually, and the distance that staggers is not less than 1m.
4. reserved shield crossing combined type foundation pit exterior-protected device as claimed in claim 3, is characterized in that: described shaped steel is coated with anti-friction agent.
5. shield crossing combined type foundation pit exterior-protected device as claimed in claim 1 reserved, is characterized in that: described shaped steel is pulled out, and pulls out in the space that shaped steel reserves and is filled with mud.
CN201420357878.6U 2014-06-30 2014-06-30 Reserved shield crossing combined type foundation pit exterior-protected device Active CN204112334U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420357878.6U CN204112334U (en) 2014-06-30 2014-06-30 Reserved shield crossing combined type foundation pit exterior-protected device

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Application Number Priority Date Filing Date Title
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Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104563132A (en) * 2015-02-05 2015-04-29 北京瑞腾基础工程技术有限公司 Method for selecting structure form of composite deep foundation pit support and composite deep foundation pit support system
CN106545005A (en) * 2016-12-05 2017-03-29 中交第三航务工程局有限公司 A kind of reinforcing body and reinforcement means of subway tunnel shield termination

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104563132A (en) * 2015-02-05 2015-04-29 北京瑞腾基础工程技术有限公司 Method for selecting structure form of composite deep foundation pit support and composite deep foundation pit support system
CN106545005A (en) * 2016-12-05 2017-03-29 中交第三航务工程局有限公司 A kind of reinforcing body and reinforcement means of subway tunnel shield termination
CN106545005B (en) * 2016-12-05 2019-05-31 中交第三航务工程局有限公司 A kind of reinforcing body and reinforcement means of subway tunnel shield end

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