CN105155578A - Construction method for existing supporting system connected into subway in complex geology and environment - Google Patents
Construction method for existing supporting system connected into subway in complex geology and environment Download PDFInfo
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- CN105155578A CN105155578A CN201510349222.9A CN201510349222A CN105155578A CN 105155578 A CN105155578 A CN 105155578A CN 201510349222 A CN201510349222 A CN 201510349222A CN 105155578 A CN105155578 A CN 105155578A
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Abstract
The invention discloses a construction method for an existing supporting system connected into a subway in the complex geology and environment. The construction method comprises the following steps that a point is selected from an underground diaphragm wall system to be built as a first axis point, and two intersecting surfaces of an original underground diaphragm wall supporting system of an original subway station and the underground diaphragm wall system to be built are set; a new underground diaphragm wall is built from the first axis point to the first connection surface to form a closed structure; an angular point closest to the first connection surface and the second connection surface is selected from the closed structure as a second axis point, and then two rows of third three-axis mixing piles are driven on the left side and the right side of a set third new underground diaphragm wall to be built from the second axis point to the second connection surface; and cement is poured into the spaces among first three-axis mixing piles, second three-axis mixing piles and the third three-axis mixing piles in sequence to form the first new underground diaphragm wall, the second new underground diaphragm wall and the third new underground diaphragm wall. By means of the method, the structural stability and the waterproof effect are improved.
Description
Technical field
The present invention relates to the existing support system construction method of access subway, particularly relate to a kind of complicated geological and the existing support system construction method for diaphragm walls of environment access subway.
Background technology
Diaphragm wall originates from Italy, through the development of decades, Diaphragm Wall is quite ripe, mid-term in last century imports China into, initial only as the gear soil of bracing of foundation pit, impervious wall, along with urban land day is becoming tight, the appearance of high level and super highrise building, it is from developing into highrise building load-bearing basis as outer wall of basement, greatly strengthen the integrated carrying ability of building, relatively reduce cost, constantly improving especially along with construction technology, constantly to ultra-thin, the development in ultra-deep direction, be widely used in rivers and lakes antiseepage, harbour, the construction of dock and Wastewater Treatment Plant and be widely used in the basement of highrise building, underground parking, subway bridge construction even.But in geology and local environmental conditions complexity, geology weakness is again containing miscellaneous fill, and during periphery next-door neighbour subway station, the construction difficulty that diaphragm wall doubles as outer wall of basement as supporting and protection structure is large.
Application number be 2010102511997 Chinese patent disclose " excavation of subway foundation pit in soft soil area anti-seepage and leak-blocking construction method ", comprise step: one, ground-connecting-wall seam pre-reinforcement construction: high-pressure rotary jet grouting pile pre-reinforcement structure construction, draw hole, sleeve valve barrel grouting and sealing of hole and again draw hole and mini-valve tube is pre-buried stand-by; Two, excavation of foundation pit and impervious leakage-stopping construction: for clearly knowing ground-connecting-wall seam existing defects and the situation that risk point is in below excavation of foundation pit face carries out anti-drain process with surperficial surface dust cleaning with encased steel plate plate reinforcement method, the hole note cyanogen method of coagulating is drawn for the breakthrough employing that percolating water situation is slight and carries out shutoff, for to leak and the serious leakage point of water leakage situation adopts lateral aperture slip casting method to carry out shutoff, after shutoff is complete, carry out filling grouting and reinforcing by pre-buried mini-valve tube.The method of this patent excavation of subway foundation pit in soft soil area impervious leakage-stopping is after the ground-connecting-wall of constructed subway has been constructed and before excavation of foundation pit, carries out reinforcing to the ground-connecting-wall seam of having constructed.Be not suitable for the ground-connecting-wall construction method for supporting of the periphery next-door neighbour subway station of the application.
Application number be 2010101688608 Chinese patent disclose " the retaining wall forming construction method thereof of diaphragm wall " Y " type embedding rock groove section dado structure and diaphragm wall " Y " type embedding rock groove section ", it comprises cement-soil mixing pile wall, cement-soil mixing pile wall is provided with steel concrete and leads wall, it is characterized in that described cement-soil mixing pile wall comprises three " V " type cement-soil mixing pile walls, three " V " type cement-soil mixing pile walls form " Y " shape, described " Y " shape cement-soil mixing pile wall two vertical corners be provided with wet concrete stake and be connected with the cement-soil mixing pile of both sides, thus form " Y " type embedding rock groove section dado structure.Diaphragm wall " Y " type embedding rock groove section adopts " five millings " forming construction method thereof.This patent disclose diaphragm wall " Y " type embedding rock groove section panelling construction method, two vertical corners are provided with wet concrete stake and are connected with the cement-soil mixing pile of both sides, are not suitable for the periphery next-door neighbour subway station of the application and the ground-connecting-wall construction method for supporting of complicated geology.
Application number be 2013106136119 Chinese patent disclose " a kind of immersed tube fetch earth cast-in-place rectangle soldier pile ground-connecting-wall and construction method thereof ", it is characterized in that being fetched earth by immersed tube arranged side by side outside foundation ditch, the steel concrete soldier pile of cast-in-place square-section, the combined type ground-connecting-wall that the cement mixing pile that overlaps mutually or cement rotary churning pile form jointly is arranged with 1-4, rectangle soldier pile transversal face length limit 600-1200mm, minor face 200-700mm, the long 10-35m of stake; Cement mixing pile or cement rotary churning pile diameter 500-1200mm, the long 10-25m of stake.This patent disclose immersed tube to fetch earth cast-in-place rectangle soldier pile ground-connecting-wall, be not suitable for the periphery next-door neighbour subway station of the application and the ground-connecting-wall construction method for supporting of complicated geology.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art, one is provided to improve labor productivity, save cost, both improve the waterproof ability with the original ground-connecting-wall seam crossing of station, former station body, also strengthen ground, add complicated geological and the existing support system construction method for diaphragm walls of environment access subway of the intensity of new and old diaphragm wall, rigidity and stability.
Complicated geological and the existing support system construction method for diaphragm walls of environment access subway, it comprises the following steps:
(1) choose in ground-connecting-wall system yet to be built a bit as the first axle point, set original supporting ground-connecting-wall system of original subway station and two phase cross surfaces of ground-connecting-wall system yet to be built; One is selected from the nearest phase cross surface of the first axle point as the first joint face at original supporting ground-connecting-wall system of original subway station and two phase cross surface places of ground-connecting-wall system yet to be built, another phase cross surface place is as the second joint face, then new ground-connecting-wall is built from the first axle o'clock to the first joint face, concrete steps are: first the nearest circuit chosen between the first axle point and the first joint face constructs, and make a call to two ranked first three axes agitating pile from the first axle o'clock to the first joint face along the yet to be built first new ground-connecting-wall left and right sides of setting; And then the circuit far away chosen between the first axle point and the first joint face is constructed, from the first described axle point, make a call to two to the first joint face along the yet to be built second new ground-connecting-wall left and right sides of setting ranked second three axes agitating pile, make the second three axes agitating pile and the first three axes agitating pile form closing structure;
(2) to choose from the first joint face and all nearest angle point of the second joint face as the second axle point in closing structure, then from the second axle point, make a call to two to the second joint face along the yet to be built 3rd new ground-connecting-wall left and right sides of setting and ranked third three axes agitating pile;
(3) successively two ranked first, build first, second, third new ground-connecting-wall between second, third three axes agitating pile;
(4) three axes agitating pile of the first elevator foundation pit and the second elevator foundation pit of constructing in the centre position of closing structure, the surrounding of described three axes agitating pile along the first elevator foundation pit of setting and the surrounding construction of the second elevator foundation pit;
(5) supporting of underground two layer region in the region that surrounded by the new ground-connecting-wall of the 3rd new ground-connecting-wall, closing structure and original supporting ground-connecting-wall system and F3/B3 Local handover bored pile is carried out;
(6) at the first joint face place construction first paragraph high-pressure rotary jet grouting pile;
(7) at the second joint face place construction second segment high-pressure rotary jet grouting pile;
(8) construction the 3rd section of high-pressure rotary jet grouting pile on the left of bored pile.
This method is applicable to circumstance complication, the environment of narrow field next-door neighbour's subway and many solitary buildings, adopts this method diaphragm wall to have enough rigidity, strength and stability, the strong adaptability of formation, Construction Vibration is little, and noise is low, construction headroom is little, and energy Appropriate application soil, barrier performance is good.Reach triple waterproof effect with both sides three axes agitating pile, add the stable of miscellaneous fill soil layer.Diaphragm wall doubles as outer wall of basement and improves labor productivity, has saved cost, has saved the duration, and economical rationality.The use of high-pressure rotary jet grouting pile, had both improve the waterproof ability with the original ground-connecting-wall seam crossing of station, former station body, and had also strengthened ground, improve the intensity of diaphragm wall, rigidity, stability.Choosing away from periphery underground utilities to be migrated and the built effect on building of surrounding of the first axle point of this method, not only ensure that the duration, and is conducive to the formation of closing structure; Namely the choosing of second axle point of this method ensure that the stable of force structure weak spot, substantially reduces the distance of rehandling mechanical material simultaneously, saved cost and duration.The first axle point of this method and choosing of the second axle point, and sequence of construction respectively from two axle points and flow process, have passed through detailed mechanics check computation, not only increase structural stability and waterproof effect.
Accompanying drawing explanation
Fig. 1 is complicated geological of the present invention and environment access subway existing support system construction method for diaphragm walls schematic top plan view;
Fig. 2 is the A node enlarged drawing of Fig. 1 of the present invention;
Fig. 3 is the B node enlarged drawing of Fig. 1 of the present invention;
Fig. 4 is the C node enlarged drawing of Fig. 1 of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Complicated geological as shown in drawings and the existing support system construction method for diaphragm walls of environment access subway, it comprises the following steps:
(1) choose in ground-connecting-wall system yet to be built a bit as the first axle point 1, first axle point selection principle is according to on-site actual situations, in order to ensure not delay the duration, first axle point, away from periphery underground utilities to be migrated, is chosen around when the first axle point 1 can ensure ground-connecting-wall construction to be onstructed simultaneously and is not had built effect on building.Set original supporting ground-connecting-wall system of original subway station and two phase cross surfaces of ground-connecting-wall system yet to be built; One is selected from the nearest phase cross surface of the first axle point as the first joint face at original supporting ground-connecting-wall system of original subway station and two phase cross surface places of ground-connecting-wall system yet to be built, another phase cross surface place is as the second joint face, then new ground-connecting-wall is built from the first axle point 1 to the first joint face, concrete steps are: first the nearest circuit chosen between the first axle point 1 and the first joint face constructs, and make a call to two ranked first three axes agitating pile from the first axle point 1 to the first joint face along yet to be built first new ground-connecting-wall 2 left and right sides of setting; And then the circuit far away chosen between the first axle point 1 and the first joint face is constructed, from the first described axle point, make a call to two to the first joint face along yet to be built second new ground-connecting-wall 3 left and right sides of setting ranked second three axes agitating pile, make the second three axes agitating pile and the first three axes agitating pile form closing structure;
(2) to choose from the first joint face and all nearest angle point of the second joint face as the second axle point 13 in closing structure, then from the second axle point 13, make a call to two to the second joint face along the yet to be built 3rd new ground-connecting-wall 12 left and right sides of setting and ranked third three axes agitating pile;
(3) successively two ranked first, build first, second, third new ground-connecting-wall between second, third three axes agitating pile;
(4) three axes agitating pile of the first elevator foundation pit 4 and the second elevator foundation pit 5 of constructing in the centre position of closing structure, the surrounding of described three axes agitating pile along the first elevator foundation pit 4 of setting and the surrounding construction of the second elevator foundation pit 5;
(5) supporting of underground two layer region 8 in the region that surrounded by the new ground-connecting-wall of the 3rd new ground-connecting-wall 12, closing structure and original supporting ground-connecting-wall system and junction, F3/B3 region 9 bored pile 6 is carried out;
(6) at the first joint face place construction first paragraph high-pressure rotary jet grouting pile 11;
(7) at the second joint face place construction second segment high-pressure rotary jet grouting pile 7;
(8) construction the 3rd section of high-pressure rotary jet grouting pile 10 on the left of bored pile 6.
Embodiment 1
(1) choose in ground-connecting-wall system yet to be built a bit as the first axle point 1, first axle point selection principle is according to on-site actual situations, in order to ensure not delay the duration, first axle point, away from periphery underground utilities to be migrated, is chosen around when the first axle point 1 can ensure ground-connecting-wall construction to be onstructed simultaneously and is not had built effect on building.Set original supporting ground-connecting-wall system of original subway station and two phase cross surfaces of ground-connecting-wall system yet to be built; One is selected from the nearest phase cross surface of the first axle point as the first joint face at original supporting ground-connecting-wall system of original subway station and two phase cross surface places of ground-connecting-wall system yet to be built, another phase cross surface place is as the second joint face, then new ground-connecting-wall is built from the first axle point 1 to the first joint face, concrete steps are: first the nearest circuit chosen between the first axle point 1 and the first joint face constructs, and make a call to two ranked first three axes agitating pile from the first axle point 1 to the first joint face along yet to be built first new ground-connecting-wall 2 left and right sides of setting; And then the circuit far away chosen between the first axle point 1 and the first joint face is constructed, from the first described axle point, make a call to two to the first joint face along yet to be built second new ground-connecting-wall 3 left and right sides of setting ranked second three axes agitating pile, make the second three axes agitating pile and the first three axes agitating pile form closing structure;
(2) to choose from the first joint face and all nearest angle point of the second joint face as the second axle point 13 in closing structure, then from the second axle point 13, make a call to two to the second joint face along the yet to be built 3rd new ground-connecting-wall 12 left and right sides of setting and ranked third three axes agitating pile;
(3) successively two ranked first, build first, second, third new ground-connecting-wall between second, third three axes agitating pile;
(4) three axes agitating pile of the first elevator foundation pit 4 and the second elevator foundation pit 5 of constructing in the centre position of closing structure, the surrounding of described three axes agitating pile along the first elevator foundation pit 4 of setting and the surrounding construction of the second elevator foundation pit 5;
(5) supporting of underground two layer region 8 in the region that surrounded by the new ground-connecting-wall of the 3rd new ground-connecting-wall 12, closing structure and original supporting ground-connecting-wall system and junction, F3/B3 region 9 bored pile 6 is carried out;
(6) at the first joint face place construction first paragraph high-pressure rotary jet grouting pile 11;
(7) at the second joint face place construction second segment high-pressure rotary jet grouting pile 7;
(8) construction the 3rd section of high-pressure rotary jet grouting pile 10 on the left of bored pile 6.
Through inspection: this method is applicable to circumstance complication, the environment of narrow field next-door neighbour's subway and many solitary buildings, adopt this method diaphragm wall to have enough rigidity, strength and stability, not only increase structural stability and waterproof effect, and reduce costs cost 2%.
Claims (1)
1. complicated geological and the existing support system construction method for diaphragm walls of environment access subway, it is characterized in that, it comprises the following steps:
(1) choose in ground-connecting-wall system yet to be built a bit as the first axle point, set original supporting ground-connecting-wall system of original subway station and two phase cross surfaces of ground-connecting-wall system yet to be built; One is selected from the nearest phase cross surface of the first axle point as the first joint face at original supporting ground-connecting-wall system of original subway station and two phase cross surface places of ground-connecting-wall system yet to be built, another phase cross surface place is as the second joint face, then new ground-connecting-wall is built from the first axle o'clock to the first joint face, concrete steps are: first the nearest circuit chosen between the first axle point and the first joint face constructs, and make a call to two ranked first three axes agitating pile from the first axle o'clock to the first joint face along the yet to be built first new ground-connecting-wall left and right sides of setting; And then the circuit far away chosen between the first axle point and the first joint face is constructed, from the first described axle point, make a call to two to the first joint face along the yet to be built second new ground-connecting-wall left and right sides of setting ranked second three axes agitating pile, make the second three axes agitating pile and the first three axes agitating pile form closing structure;
(2) to choose from the first joint face and all nearest angle point of the second joint face as the second axle point in closing structure, then from the second axle point, make a call to two to the second joint face along the yet to be built 3rd new ground-connecting-wall left and right sides of setting and ranked third three axes agitating pile;
(3) successively two ranked first, build first, second, third new ground-connecting-wall between second, third three axes agitating pile;
(4) three axes agitating pile of the first elevator foundation pit and the second elevator foundation pit of constructing in the centre position of closing structure, the surrounding of described three axes agitating pile along the first elevator foundation pit of setting and the surrounding construction of the second elevator foundation pit;
(5) supporting of underground two layer region in the region that surrounded by the new ground-connecting-wall of the 3rd new ground-connecting-wall, closing structure and original supporting ground-connecting-wall system and F3/B3 Local handover bored pile is carried out;
(6) at the first joint face place construction first paragraph high-pressure rotary jet grouting pile;
(7) at the second joint face place construction second segment high-pressure rotary jet grouting pile;
(8) construction the 3rd section of high-pressure rotary jet grouting pile on the left of bored pile.
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Cited By (3)
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| CN105926668A (en) * | 2016-06-23 | 2016-09-07 | 程华清 | Construction method of partition wall between ultradeep foundation pit and place near dangerous building |
| CN114837240A (en) * | 2022-05-10 | 2022-08-02 | 中交一公局集团有限公司 | Structure and method for improving bearing capacity of single-chamber closed underground continuous wall foundation by using rear drilled piles |
| CN117211289A (en) * | 2023-11-08 | 2023-12-12 | 中国建筑第六工程局有限公司 | Construction method of multiple systems of foundation in complex environment |
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| CN117211289A (en) * | 2023-11-08 | 2023-12-12 | 中国建筑第六工程局有限公司 | Construction method of multiple systems of foundation in complex environment |
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