Shield tunnel closely passes through the isolation pile construction method of building Deformation control
Technical field
The present invention relates to a kind of isolation pile construction method, refer to especially a kind of be used for shield tunnel closely by the time, control building settlement shield tunnel closely pass through the isolation pile construction method of building Deformation control.
Background technology
Owing to the complexity of shield tunnel construction technology, can't eliminate the ground settlement of shield structure top soil layer at present fully.Especially the historical ancient building that higher for the historical value of closing on the shield tunnel construction scene, weak foundation, structure are extremely fragile, the settlement influence that shield tunnel construction causes is the structure of the historical heritage buildings of deep harm, even used state-of-the-art airtight shield structure technology, still can't eliminate ground settlement fully.
At present, stirring isolation pile and common filling pile that mostly the construction of adopting is simple, expense is lower, utilize isolation method blocking-up shield tunnel closely by the time to the disturbance on historical heritage buildings basis, and reduce the structure of ground settlement with the protection heritage buildings.
Application number is the Chinese patent of 200610029159.1 " isolation pile construction methods that are used for important building protection "; a kind of isolation campshed that forms a stifled enclosure wall is disclosed; and can provide impermeable role; effectively key protection point is built; and in before by the engineering construction of laying special stress on protecting building one side; adopt the deep-mixed pile soil mass consolidation,, lay special stress on protecting the phreatic loss of building one side to solve the next-door neighbour as isolating the retaining wall body.
Application number is the Chinese patent of 200610116618.X " job practicess of double-circular shield near-distance passing through building or structure " in addition; construction resist technology when disclosing a kind of shield structure near-distance passing through building or structure; this technology mainly adopts the mode that sets in advance common isolation pile and control shield tunnel construction technology parameter to reduce closing on the influence of building, but the concrete job practices of unexposed isolation pile.
Above-mentioned two kinds of worker's methods all reduce when Control Engineering is constructed closing on the influence of building, but when not taking into full account isolation pile itself and constructing to closing on influence or the risk that building brings.
In fact, the construction of common isolation pile is concerning the historical heritage buildings of settlement request harshness, have factor such as big in the full rate height (the hole risk of collapsing is arranged in the process) of concreting, the work progress, that intensity is low and can cause bigger surface settlement, and endanger the structural safety of important historical building thing soil disturbance.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of shield tunnel closely to pass through the isolation pile construction method of building Deformation control; improve the settlement issues that existing isolation pile construction method causes, can't satisfy and protect the historical heritage buildings of settlement request harshness.
Technical solution of the present invention is: it is when being used for shield-tunneling construction and closely passing through; the control sedimentation is to protect historical heritage buildings; it is characterized in that the isolation pile construction method that this shield tunnel closely passes through the building Deformation control comprises following steps:
Build steel concrete power transmission platform, build one deck steel concrete power transmission platform, and reserve the perforation of an aperture greater than the isolation pile diameter in the place, stake position of desire boring according to the construction operation face;
Pile sinking pore-forming step, the auger stem that respectively an outer tube and is positioned at this outer tube with a full circle swinging jacketing machine sinks to the stake position, this outer tube is opposite with the direction of rotation of auger stem, and according to design requirement adjunction outer tube and auger stem, again auger stem is proposed until design elevation, surplus soil zone in the outer tube is gone out, and remove the interior loosened soil of outer tube, the soil body of guaranteeing the isolation pile bottom is original soil layer;
Reinforcing cage is installed, will will be adopted 2 double hooks slowly to lift by crane according to the reinforcing cage of designing requirement manufacturing, whether the reinforcing cage orientation is transferred and adjusted to the point that progressively falls, and all bind lining rope before the placement of cage of reinforcing bar and float with the monitoring reinforcing cage;
Concreting, to carry out concrete spouting first after the tremie arrangement, concrete carries out the tube drawing operation with drawbench after falling to finishing first, and check that outer tube rises to pull out and whether smooth and easyly whether float with reinforcing cage, rising of steel cage then carries out back-pressure to be handled, after treating that outer tube is extracted fully, just carry out supplementary irrigation according to need, capable again dismantling concrete conduit after having irritated; And auxiliary slip casting measure, before advancing, finishes the shield structure injected hole pore-forming operation between isolation pile, carry out tracking grouting according to the monitoring situation in the shield structure progradation.
Aforesaid shield tunnel closely passes through the isolation pile construction method of building Deformation control, the outer tube reverse rotation, auger stem is rotated in the forward and takes out the soil in the outer tube, soil is discharged from the earth discharging hole on the outer tube, and outer tube forms retaining wall and auxiliary water mud and water glass slip casting.
Aforesaid shield tunnel closely passes through the isolation pile construction method of building Deformation control, in pile sinking pore-forming step, the telephone-moving of full circle swinging jacketing machine is with the center and stake position centrally aligned of outer tube, after the vertical collimator adjustment outer tube verticality with the full circle swinging jacketing machine, check that once more the center of outer tube and stake are the registration at center.
Aforesaid shield tunnel closely passes through the isolation pile construction method of building Deformation control, in building steel concrete power transmission platform, is to build thickness greater than 20 centimeters steel concrete power transmission platform.
Aforesaid shield tunnel closely passes through the isolation pile construction method of building Deformation control, and in the reinforcing cage step was installed, reinforcing cage was provided with positioning roller, and the reinforcing cage bottom is provided with horizontal anti-floating steel plate.
Aforesaid shield tunnel closely passes through the isolation pile construction method of building Deformation control, in the concreting step, carry out the material loading operation with storage bin(hopper), the plug of storage bin(hopper) adopts circular steel plate and with seizing wire suspention, and first the amount of material loading greater than the amount of concrete perfusion first.
Aforesaid shield tunnel closely passes through the isolation pile construction method of building Deformation control, and in this isolation pile construction method, the pore-forming of isolation pile adopts the mode of tripping pore-forming in proper order.
Advantage of the present invention is: adopt special tiretube process in pile sinking pore-forming step; be that outer tube is opposite with the direction of rotation of auger stem; and the pile sinking practice that the auger stem rotation is fetched earth; absolute altitude at the bottom of making outer tube and auger stem be drilled into synchronously; the mode that rotation is fetched earth can reduce the noise in the work progress; and avoid impact to the soil body; wherein; outer tube can provide the retaining wall effect and isolate in the work progress disturbance to surrounding soil; significantly outside squeezing action is arranged simultaneously; to reduce soil body loss; further auxiliary water mud and water glass slip casting; the effectively sedimentation in the control isolation pile construction process; can control the closely sedimentation when the heritage buildings of shield-tunneling construction so shield tunnel of the present invention closely passes through the isolation pile construction method of building Deformation control, protect the safety of heritage buildings simultaneously, and at the peculiar soil layer in Shanghai; when shield tunnel closely passes through under the environmental requirement harsh conditions, very effective to historical building group's Deformation control.
Description of drawings
Fig. 1 closely passes through the schematic flow sheet of a specific embodiment of the isolation pile construction method of building Deformation control for shield tunnel of the present invention.
The specific embodiment
As shown in Figure 1; disclose the schematic flow sheet that shield tunnel provided by the present invention closely passes through the isolation pile construction method of building Deformation control; the isolation pile construction method that this shield tunnel closely passes through the building Deformation control is when being used for shield-tunneling construction and closely passing through; the control sedimentation is to protect historical heritage buildings; the implementation step that this shield tunnel closely passes through the isolation pile construction method of building Deformation control comprises: build steel concrete power transmission platform; pile sinking pore-forming step continues; and reinforcing cage and concreting are installed, carrying out auxiliary slip casting measure.
In the step of building steel concrete power transmission platform, according to the practice of construction scope of operation, build a layer thickness greater than 20 centimeters steel concrete power transmission platform, and in the place, stake position of desire boring, on steel concrete power transmission platform, reserve the perforation of an aperture greater than the isolation pile diameter, the diameter of its middle punch is bigger 2 centimeters than isolation pile diameter, and this steel concrete power transmission platform forms and leads wall, and can guarantee the verticality of follow-up pore-forming.
In the step of pile sinking pore-forming, with a full circle swinging jacketing machine telephone-moving, make outer tube center and stake position centrally aligned on the full circle swinging jacketing machine, and after the vertical collimator adjustment outer tube verticality with this full circle swinging jacketing machine, the center of checking outer tube once more is the registration at center with stake, again with the full circle swinging jacketing machine, respectively outer tube and the auger stem that is positioned at this outer tube are sunk to rotation mode, this outer tube is opposite with the direction of rotation of auger stem, and according to design requirement adjunction outer tube and auger stem, again auger stem is proposed until design elevation, surplus soil zone in the outer tube is gone out, and the loosened soil in the removing outer tube, the soil body of guaranteeing the isolation pile bottom is original soil layer, wherein, the outer tube reverse rotation, auger stem is rotated in the forward and takes out the soil in the outer tube, soil is discharged from the earth discharging hole on the outer tube, outer tube forms retaining wall and auxiliary water mud and water glass slip casting, in addition, native face absolute altitude in the outer tube is higher than the end absolute altitude 3-5 meter of outer tube all the time, prevent piping, and according to geological condition, the comparable actual stake of the degree of depth of outer tube is long dark 1 meter, prevent soil body piping phenomenon, and will monitor in real time in the construction, judge whether the soil layer classification conforms to geologic data.
In the step that reinforcing cage is installed, the manufacturing of reinforcing cage is according to designing requirement, be provided with positioning roller around the reinforcing cage, and the reinforcing cage bottom is provided with horizontal anti-floating steel plate, the reinforcing cage after will making with the slow lifting of 2 double hooks, the point that progressively falls is transferred, reinforcing cage is deformed, in transferring process, progressively adjust the reinforcing cage direction, and all bind lining rope before the placement of cage of reinforcing bar, whether float to guarantee reinforcing cage accurate positioning and monitoring reinforcing cage.
In the step of concreting, to carry out concrete spouting first after the tremie arrangement, concrete carries out the tube drawing operation with drawbench after falling to finishing first, adopt drawbench to carry out tube drawing, and check that outer tube rises to pull out and whether smooth and easyly whether float with reinforcing cage, rising of steel cage then carries out back-pressure to be handled, work the amount of pulling out and be controlled at the 10-20 centimetre, after treating that outer tube is extracted fully, just carry out supplementary irrigation according to need, capable again dismantling concrete conduit after having irritated, wherein, adopt storage bin(hopper) to carry out the material loading operation in the step of concreting, the plug of storage bin(hopper) adopts circular steel plate and with the seizing wire suspention, and first the amount of material loading greater than the amount of concrete perfusion first.
In the step of auxiliary slip casting measure, before advancing, finishes the shield structure injected hole pore-forming operation between isolation pile, carry out tracking grouting according to the monitoring situation in the shield structure progradation.
Closely pass through in the isolation pile construction method of building Deformation control in shield tunnel of the present invention, the pore-forming of isolation pile adopts the mode of tripping pore-forming in proper order, for example the construction pile No. of pore-forming order is 1-7-12... in proper order, treats adjacent construction pile No. 2-8-13... to be constructed after intensity acquires a certain degree again.
In sum; shield tunnel of the present invention closely passes through and adopts the outer tube pile sinking practice opposite with the direction of rotation of auger stem in the isolation pile construction method of building Deformation control; fetch earth and discharge with auger stem rotation via the earth discharging hole on the outer tube; and outer tube and auger stem can be drilled into synchronously at the bottom of absolute altitude; wherein; the mode that rotation is fetched earth can reduce the noise and the impact of avoiding the soil body in the work progress; in addition; outer tube can provide the retaining wall effect in work progress; and in the isolation work progress to the disturbance of surrounding soil; produce significantly outside squeezing action simultaneously; make soil body loss reduce; but auxiliary water mud and water glass slip casting again; reach the settling amount in effective control isolation pile construction process; can isolate simultaneously the settlement influence in the shield-tunneling construction process; so closely passing through the isolation pile construction method of building Deformation control, shield tunnel of the present invention can control the closely sedimentation when the heritage buildings of shield-tunneling construction; the structural safety of protection heritage buildings is particularly useful for the peculiar soil layer in Shanghai.