CN105065011A - Construction method of soft soil shield tunneling cutting pile foundation - Google Patents
Construction method of soft soil shield tunneling cutting pile foundation Download PDFInfo
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- CN105065011A CN105065011A CN201510474447.7A CN201510474447A CN105065011A CN 105065011 A CN105065011 A CN 105065011A CN 201510474447 A CN201510474447 A CN 201510474447A CN 105065011 A CN105065011 A CN 105065011A
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- pile foundation
- construction method
- shield machine
- steel bar
- bar concrete
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Abstract
The invention relates to a construction method of a soft soil shield tunneling cutting pile foundation. The construction method comprises the following steps of: setting a digging path of a shield tunneling machine in a soft soil layer; determining a reinforced concrete pile foundation on the digging path; improving a cutter head opening rate of the shield tunneling machine to a value higher than 40 percent; additionally installing cutting cutters on a cutter head of the shield tunneling machine, wherein at least two cutting cutters are arranged on the same circumference track of the cutter head; and during the pile foundation cutting by the shield tunneling machine, regulating the soil pressure of the shield tunneling machine to be 0.15MPa to 0.3MPa, the pushing speed to be 3mm/min to 4mm/min and the cutter head rotating speed to be 0.91r/min. Through improving the shield tunneling machine, improving the cutter head opening rate and increasing the cutting cutters, the shield tunneling machine can be used for directly cutting the met pile foundation in the tunneling process of the shield tunneling machine; the reasonable construction parameter setting is matched, so that the shield tunneling machine can smoothly cut the pile foundation; and the shield tunneling construction of the soft soil pile foundation is well realized.
Description
Technical field
The present invention relates to construction of tunnel field, refer in particular to the construction method that a kind of weak soil shield structure cuts pile foundation.
Background technology
Earth pressure balanced shield is constructed at Soft Soil Layer, and usual soil property is comparatively even, and for the obstruction in weak soil, conventional employing is removed obstacles or the mode process of adjustment of route alignment and gradient avoiding obstacles, but which increases the cost of engineering and the impact on social environment.
How effectively reduce because underground obstacle exists impact on cost and social environment, become a construction difficult problem anxious to be resolved.
Summary of the invention
The object of the invention is to the defect overcoming prior art, provide a kind of weak soil shield structure to cut the construction method of pile foundation, solve tradition and adopt and remove obstacles or adjustment of route alignment and gradient avoiding obstacles and engineering cost is increased and to problems such as social environment have an impact.
The technical scheme realizing above-mentioned purpose is:
A kind of weak soil shield of the present invention structure cuts the construction method of pile foundation, comprising:
The setting excavation path of shield machine in Soft Soil Layer, determines the steel bar concrete pile that described excavation path exists;
According to described steel concrete device, the cutterhead aperture opening ratio of shield machine is increased to more than 40%, and set up bite on the cutterhead of described shield machine, make the same circular path of described cutterhead includes at least two described bites; And
Start described shield machine and control described shield machine and construct according to the described excavation path of setting, when described shield machine runs into described steel bar concrete pile and cuts described steel bar concrete pile on described excavation path, the soil pressure adjusting described shield machine is 0.15MPa to 0.3MPa, fltting speed is 3mm/min to 4mm/min, and cutterhead rotating speed is 0.91r/min.
By changing a social system shield machine, increase cutterhead aperture opening ratio, increase bite, make in shield machine tunneling process, directly can cut the pile foundation run into, coordinate rational construction parameter to set, shield machine can successfully be cut pile foundation, the good shield-tunneling construction achieving weak soil pile foundation, the problem that the cost that effective solution tradition is removed obstacles and adjustment of route alignment and gradient avoiding obstacles brings increases and the problem causing the impact on social environment.
The further improvement that weak soil shield structure of the present invention cuts the construction method of pile foundation is, also comprises:
Increase the jack quantity of described shield machine, make the gross thrust of described jack be at least 46800KN.
The further improvement that weak soil shield structure of the present invention cuts the construction method of pile foundation is, also comprises:
Promote the driving torque of the screw machine of described shield machine, described driving torque is at least 100kN.m.
The further improvement that weak soil shield structure of the present invention cuts the construction method of pile foundation is, utilize before and after steel bar concrete pile described in shield machine cutting, in the position of described steel bar concrete pile and before and after described steel bar concrete pile a setpoint distance segment assembly, two injected holes are at least set up in other sections of jurisdiction except the section of jurisdiction being positioned at top, make described steel bar concrete pile place and before and after described steel bar concrete pile the slip casting at a setpoint distance place evenly to prevent the soil body sedimentation at described steel bar concrete pile place.
The further improvement that weak soil shield structure of the present invention cuts the construction method of pile foundation is, also comprises:
Carry out slip casting by described injected hole to outside the described section of jurisdiction at described steel bar concrete pile place, controlling grouting amount is 180% to 220% of space between described section of jurisdiction and tunneling.
The further improvement that weak soil shield structure of the present invention cuts the construction method of pile foundation is, described setpoint distance is the width of 10 endless tube sheets.
The further improvement that weak soil shield structure of the present invention cuts the construction method of pile foundation is, also comprises described in described shield machine cutting during steel bar concrete pile:
Adjust the unearthed amount of described shield machine at 37.12m
3to 37.88m
3between, the depth of cut is 1.65mm/r to 2.2mm/r, and the depth of cut being positioned at the described bite of outmost turns is 0.83mm/r to 1.1mm/r, and gross thrust is between 14000KN to 16000KN.
The further improvement that weak soil shield structure of the present invention cuts the construction method of pile foundation is, being positioned at the described bite of outmost turns on described cutterhead is four.
The further improvement that weak soil shield structure of the present invention cuts the construction method of pile foundation is, described bite is shell cutter.
Accompanying drawing explanation
Fig. 1 is the flow chart that weak soil shield structure of the present invention cuts the construction method of pile foundation.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
The invention provides the construction method that a kind of weak soil shield structure cuts pile foundation, for the obstruction existed in weak soil, this obstruction is the pile foundation of concrete structure, construction method of the present invention is for cutting steel bar concrete pile, method for remanufacturing is proposed to shield machine, additionally provide rational construction parameter, complete pile foundation preferably and cut construction.Below in conjunction with accompanying drawing, the construction method that weak soil shield structure of the present invention cuts pile foundation is described.
Consult Fig. 1, show the flow chart that weak soil shield structure of the present invention cuts the construction method of pile foundation.Below in conjunction with Fig. 1, the construction method of weak soil shield structure of the present invention being cut to pile foundation is described.
As shown in Figure 1, the construction method of weak soil shield structure cutting pile foundation of the present invention comprises:
The setting excavation path of shield machine in Soft Soil Layer, determines the steel bar concrete pile that this excavation path exists;
Step S11, shield machine is changed a social system, and according to the operating mode of the steel bar concrete pile that shield driving axis exists, changes a social system as follows shield machine:
For the cutter head of shield machine transformation of the way, the cutterhead aperture opening ratio of shield machine is increased to more than 40%, and the former cutterhead aperture opening ratio of shield machine is 35%, increases cutterhead aperture opening ratio to make the soil body be cut can enter smoothly in the native cabin of shield machine.Bite set up by the cutterhead of shield machine, the same circular path on cutterhead includes at least two bites, this bite better employing shell cutter, there is good intensity, on cutterhead outmost turns four shell cuttves are circumferentially set, preferably, cutterhead is set up 42 shell cuttves.
For the propulsion system transformation of the way, increase the quantity of the jack of shield machine, make the gross thrust of jack be increased to more than 46800KN by original 38400KN, avoid the situation of in emergency circumstances gross thrust deficiency.
For the screw machine transformation of the way, promote the driving torque of screw machine of shield machine, by driving torque by original maximum 63kN.m be promoted to 100kN.m and more than, strengthen the casting ability of screw machine.
Step S12, pile foundation place sets up injected hole in section of jurisdiction, in order to effectively control shield machine through in the process of pile foundation, the Settlement and displacement of pile foundation, injected hole is increased at pile foundation place and on the section of jurisdiction of a setpoint distance before and after pile foundation, except the section of jurisdiction being positioned at top, the section of jurisdiction at other positions all at least establishes two injected holes newly, improves the uniformity of slip casting, to prevent the Settlement and displacement at pile foundation place by setting up injected hole.This setpoint distance is the width of 10 endless tube sheets, namely 10 endless tube sheets before and after pile foundation place also set up injected hole, except the section of jurisdiction being positioned at top, the section of jurisdiction at other positions all at least establishes two injected holes newly equally, each endless tube sheet is formed by six pipe sheet assemblings, except the section of jurisdiction being positioned at top, injected hole is all set up in all the other five sections of jurisdiction, and namely each endless tube sheet at least establishes 10 injected holes newly.By improving the mud slurry uniform of 10 rings before and after pile foundation place and pile foundation, effectively control the pile foundation settlement before and after shield crossing and displacement.
Start shield machine and control shield machine and construct according to the excavation path of setting, when shield machine runs into steel bar concrete pile and cuts pile foundation on excavation path, perform step S13, the construction parameter cutting pile foundation is rationally set.The transformation of the way of shield machine coordinates rational construction parameter, good achieves the construction that weak soil shield structure cuts pile foundation, before rational construction parameter is set, segmentation is carried out to the excavation construction of shield machine, carry out control by stages Division, to realize rationally arranging the construction parameter cutting pile foundation, shield machine is excavated construction and be divided into examination propelling section, segment of cutting and rear control section three stage, set construction parameter when adjusting shield machine cutting pile foundation by examination propelling section, segment of cutting and the rear triphasic construction parameter analysis of control section.Rationally arranging the construction parameter cutting pile foundation comprises as follows:
The soil pressure of adjustment shield machine is 0.15MPa to 0.3MPa, when being positioned at subsurface level about 23 meters, soil pressure is adjusted to 0.15MPa to 0.2MPa, when being positioned at subsurface level about 29 meters, soil pressure is adjusted to 0.25MPa to 0.3MPa, and this soil pressure force value advances section ground and building settlement situation reasonable set according to examination.
The unearthed amount of adjustment shield machine, controls unearthed amount, in 98% to 100% of the theory amount of being unearthed, namely to control unearthed amount at 37.12m
3to 37.88m
3between.
The fltting speed of adjustment shield machine is 3mm/min to 4mm/min.
The cutterhead rotating speed of adjustment shield machine is 0.91r/min.
The depth of cut of adjustment shield machine, the basic depth of cut is 1.65mm/r to 2.2mm/r, and the depth of cut being positioned at the bite of outmost turns is 0.83mm/r to 1.1mm/r.
The synchronous grouting of adjustment shield machine, carries out slip casting by injected hole to 10 endless tube sheet places before and after pile foundation place and pile foundation, and controlling grouting amount is 180% to 220% of space between section of jurisdiction and tunneling.
The shield attitude of adjustment shield machine, adopts repeatedly a small amount of, steady slope method and gentle slope method.
The shield structure gross thrust of adjustment shield machine, controls between 14000KN to 16000KN.
Weak soil shield structure of the present invention is cut to the effect detection of pile base construction method:
The above-mentioned shield machine transformation of the way and construction parameter is adopted to cut the concrete parts of pile foundation, from the unearthed situation of screw machine, substantially based on the broken concrete of 5cm to 10cm, increase the aperture opening ratio of cutterhead, broken concrete can be entered in native cabin smoothly, and broken concrete also can be discharged smoothly by screw machine.In working angles, the sedimentation of pile foundation upper building adds up as 1mm to 2mm, and posterior settlement is 1mm to 2mm, and all in the allowed band of sedimentation, what construction method of the present invention was good achieves weak soil shield structure cutting pile foundation construction.
Below embodiment is to invention has been detailed description 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.Thus, some details in embodiment should not form limitation of the invention, the present invention by the scope that defines using appended claims as protection scope of the present invention.
Claims (9)
1. weak soil shield structure cuts a construction method for pile foundation, it is characterized in that, comprising:
The setting excavation path of shield machine in Soft Soil Layer, determines the steel bar concrete pile that described excavation path exists;
According to described steel bar concrete pile, the cutterhead aperture opening ratio of shield machine is increased to more than 40%, and set up bite on the cutterhead of described shield machine, make the same circular path of described cutterhead includes at least two described bites; And
Start described shield machine and control described shield machine and construct according to the described excavation path of setting, when described shield machine runs into described steel bar concrete pile and cuts described steel bar concrete pile on described excavation path, the soil pressure adjusting described shield machine is 0.15MPa to 0.3MPa, fltting speed is 3mm/min to 4mm/min, and cutterhead rotating speed is 0.91r/min.
2. weak soil shield structure as claimed in claim 1 cuts the construction method of pile foundation, it is characterized in that, also comprises:
Increase the jack quantity of described shield machine, make the gross thrust of described jack be at least 46800KN.
3. weak soil shield structure as claimed in claim 1 or 2 cuts the construction method of pile foundation, it is characterized in that, also comprises:
Promote the driving torque of the screw machine of described shield machine, described driving torque is at least 100kN.m.
4. weak soil shield structure as claimed in claim 1 cuts the construction method of pile foundation, it is characterized in that, utilize before and after steel bar concrete pile described in shield machine cutting, in the position of described steel bar concrete pile and before and after described steel bar concrete pile a setpoint distance segment assembly, two injected holes are at least set up in other sections of jurisdiction except the section of jurisdiction being positioned at top, make described steel bar concrete pile place and before and after described steel bar concrete pile the slip casting at a setpoint distance place evenly to prevent the soil body sedimentation at described steel bar concrete pile place.
5. weak soil shield structure as claimed in claim 4 cuts the construction method of pile foundation, it is characterized in that, also comprises:
Carry out slip casting by described injected hole to outside the described section of jurisdiction at described steel bar concrete pile place, controlling grouting amount is 180% to 220% of space between described section of jurisdiction and tunneling.
6. weak soil shield structure as claimed in claim 4 cuts the construction method of pile foundation, and it is characterized in that, described setpoint distance is the width of 10 endless tube sheets.
7. weak soil shield structure as claimed in claim 1 cuts the construction method of pile foundation, it is characterized in that, also comprises described in described shield machine cutting during steel bar concrete pile:
Adjust the unearthed amount of described shield machine at 37.12m
3to 37.88m
3between, the depth of cut is 1.65mm/r to 2.2mm/r, and the depth of cut being positioned at the described bite of outmost turns is 0.83mm/r to 1.1mm/r, and gross thrust is between 14000KN to 16000KN.
8. weak soil shield structure as claimed in claim 1 cuts the construction method of pile foundation, and it is characterized in that, being positioned at the described bite of outmost turns on described cutterhead is four.
9. the weak soil shield structure as described in claim 1 or 8 cuts the construction method of pile foundation, and it is characterized in that, described bite is shell cutter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510474447.7A CN105065011A (en) | 2015-08-05 | 2015-08-05 | Construction method of soft soil shield tunneling cutting pile foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510474447.7A CN105065011A (en) | 2015-08-05 | 2015-08-05 | Construction method of soft soil shield tunneling cutting pile foundation |
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| Publication Number | Publication Date |
|---|---|
| CN105065011A true CN105065011A (en) | 2015-11-18 |
Family
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Family Applications (1)
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|---|---|---|---|
| CN201510474447.7A Pending CN105065011A (en) | 2015-08-05 | 2015-08-05 | Construction method of soft soil shield tunneling cutting pile foundation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106640105A (en) * | 2017-02-13 | 2017-05-10 | 中铁十九局集团轨道交通工程有限公司 | Soft land layer shield pile grinding system and pile grinding method |
| CN106698207A (en) * | 2017-01-13 | 2017-05-24 | 中铁十局集团城市轨道工程有限公司 | Construction method for dismounting shield tunneling machine in tunnel |
| CN109538221A (en) * | 2018-11-06 | 2019-03-29 | 山东大学 | A kind of fill method for filling shield tunnel gap and the shield machine for realizing this method |
| CN112682052A (en) * | 2019-10-18 | 2021-04-20 | 中铁第六勘察设计院集团有限公司 | Construction method for underpinning pile foundation in shield tunnel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106698207A (en) * | 2017-01-13 | 2017-05-24 | 中铁十局集团城市轨道工程有限公司 | Construction method for dismounting shield tunneling machine in tunnel |
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| CN109538221A (en) * | 2018-11-06 | 2019-03-29 | 山东大学 | A kind of fill method for filling shield tunnel gap and the shield machine for realizing this method |
| CN112682052A (en) * | 2019-10-18 | 2021-04-20 | 中铁第六勘察设计院集团有限公司 | Construction method for underpinning pile foundation in shield tunnel |
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| C06 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20151118 |