CN103898916A - Mini-pile combined support structure and construction method thereof - Google Patents
Mini-pile combined support structure and construction method thereof Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 98
- 239000010959 steel Substances 0.000 claims abstract description 98
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000002787 reinforcement Effects 0.000 claims description 72
- 239000004568 cement Substances 0.000 claims description 62
- 238000013019 agitation Methods 0.000 claims description 54
- 230000003014 reinforcing effect Effects 0.000 claims description 53
- 239000002131 composite material Substances 0.000 claims description 18
- 239000011083 cement mortar Substances 0.000 claims description 16
- 238000005553 drilling Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000002689 soil Substances 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 6
- 210000003205 muscle Anatomy 0.000 claims description 6
- 238000007569 slipcasting Methods 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000011440 grout Substances 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 5
- 239000004570 mortar (masonry) Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009412 basement excavation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The invention discloses a mini-pile combined support structure and a construction method thereof. The mini-pile combined support structure comprises a crown beam, a mini pile, a mixing pile and a grouting anchor rod. The mixing pile is connected with the mini pile through the crown beam, and a grouting steel tube is inserted into the mixing pile, so that water stop effect can be realized, and bending resistance of an enclosing structure can be improved. Support points of the enclosing structure are increased by the grouting anchor rod, so that deformation of the enclosing structure can be further controlled.
Description
Technical field
The present invention relates to foundation field, relate in particular to a kind of mini stake Composite Braced Retaining Structure and construction method.
Background technology
In order to reduce the impact of soil excavation on surrounding environment, at present, steel reinforced concrete fender post is widely used in base pit engineering and slope project, although its pile strength is very high, but for single stake, when for the gear soil body, its bending rigidity is more limited, therefore, be difficult to the displacement of stake top effectively to control.As adopted even double-row pile of large diameter pile in order to increase anti-bending strength, naturally bring the significantly lifting of construction costs, and the strength character of pile body is not not fully exerted.On the other hand, the exploitation of urban underground space also can be subject to the restriction of construction plant condition.These factors have all proposed challenge to traditional steel reinforced concrete fender post.
For the mini stake of traditional concrete, because its footpath is less and need place in advance reinforcing bar, in the time adopting tremie to pour into, difficulty of construction is higher and construction cost is higher.The mini stake of tradition adopts one or a few high performance steel to be positioned over drill center, is mainly used in vertical compression or resistance to plucking, when reinforcing bar during in center its pile body bending rigidity less.In addition, be rich in the engineering of underground water at some, for guaranteeing that soil excavation carries out smoothly, need to form in space enclosing structure outer ring water-stop curtain, complicated operation.
Summary of the invention
The object of the invention is to in existing bracing of foundation pit technology, due to foundation ditch, around construction plant is limited, traditional fender post construction cannot launch, and the shortcoming such as common mini stake bending rigidity is little provides a kind of mini stake Composite Braced Retaining Structure and construction method.
The object of the invention is to be achieved through the following technical solutions: mini stake Composite Braced Retaining Structure, comprise Guan Liang, mini stake, agitation pile and grouted anchor bar, Guan Liang connects to form by being preced with the vertical muscle of beam stirrup and Guan Liang, in described mini stake, be arranged symmetrically with two mini stake vertical reinforcements and a mini stake steel pipe along pile center, two mini stake vertical reinforcements and mini stake steel pipe distance is each other 0.6-0.9d, and d is mini stake stake footpath; Two mini stake vertical reinforcements and mini stake steel pipe vertically interval 2-4 m are fixed with transverse reinforcement, and mini stake vertical reinforcement, mini stake steel pipe form reinforcing cage, joints cement mortar on reinforcing cage with transverse reinforcement; The agitation pile steel pipe that agitation pile is built Deep-stirred Soil-cement body by Deep-stirred Soil-cement body and insertion forms; After grouted anchor bar is connected with end grappling steel plate by grouted anchor bar reinforcing bar, builds injecting cement paste and form; The top of mini stake vertical reinforcement, mini stake steel pipe and agitation pile steel pipe is all connected with hat beam stirrup, and mini stake is all connected with Guan Liang with agitation pile; Grouted anchor bar reinforcing bar is connected with agitation pile steel pipe with vertical reinforcement respectively, and grouted anchor bar is connected with mini stake and agitation pile respectively.
As preferably, in described agitation pile, steel pipe length is not less than the length of Deep-stirred Soil-cement body, and the diameter of described cement mixing method is D, and adjacent cement mixing method overlaps mutually, and the width of overlap joint is 0.2-0.4D.
The construction method of mini stake Composite Braced Retaining Structure, comprises the following steps:
1, around foundation ditch, excavate groove, cutting depth is more than or equal to the design height of Guan Liang;
2, select fixed pile position, carry out pile crown location, select geology exploratory drilling rig or jumbolter, hole by minor diameter hollow drill bit, adopt the mode of mud off to protect a hole when boring, the diameter d of mini stake is 20cm-40cm;
3, fixing reinforcing cage, the mini stake vertical reinforcement of two and mini stake steel pipe vertically interval 2-4 m are fixed with transverse reinforcement, and mini stake vertical reinforcement, mini stake steel pipe form reinforcing cage with transverse reinforcement;
4, the reinforcing cage fixing is put into a hole, reinforcing cage upper end reserves 20-40cm to be connected with reinforcing bar in hat beam, the mini stake vertical reinforcement of two and the distance of a mini stake steel pipe and mini pile center are 0.4-0.45 times of mini stake diameter d, meanwhile, agitation pile steel tube end part filters parcel in order to avoid stops up;
5, in stake hole, inject clear water by plastic pipe by Grouting Pipe, returning out concentration of slurry when top, stake hole is 1.00g/cm
3-1.05 g/cm
3time, stopping injecting clear water, and pour into cement mortar in stake hole, strength of cement mortar is M20;
6, after mortar is filled to design height, place more than 7 days, carry out slip casing by pressure, the water/binder ratio of cement paste is 0.5-1.0 (g/g), stops slip casting in the time that top, stake hole has cement paste to emerge;
7, mixing pile construction: building diameter D is 40-85cm Deep-stirred Soil-cement body, be preferably 0-2m with mini stake clear spacing, stake is long should be greater than at least 3m of cutting depth, after completing, steel pipe is inserted to not solidified Deep-stirred Soil-cement body, before being pressed into, the reserved aperture of steel pipe walls is wrapped up, in order to avoid aperture is blocked by cement paste, place more than 7 days, aperture is carried out to slip casing by pressure;
8, the grouted anchor bar tilting is constructed, after drilling construction completes, reinforcing bar is inserted and injects cement grout along the hole heart;
9, after mini stake and mixing pile construction finish, carry out the construction of Guan Liang, the mini stake vertical reinforcement on two, mini stake top and mini stake steel pipe and agitation pile steel pipe are welded with hat beam stirrup, after having welded, carry out concrete building and maintenance.
As preferably, in step 1, to be preced with back portion and to be located at below earth's surface, the above soil body of Guan Liang adopts part to put domatic formula.
As preferably, in step 6 and 7, grouting pressure is controlled at 1-5MPa.
The invention has the beneficial effects as follows: the present invention is connected with mini stake agitation pile by Guan Liang, and in agitation pile, inserts slip casting steel pipe, can play sealing effect, can improve again the anti-bending strength of space enclosing structure.As re-use grouted anchor bar, and increase the strong point of space enclosing structure, can further control space enclosing structure distortion, and can not cause the inconvenience of excavation operation.Overall performance is good and bending rigidity is high, can be good at controlling the distortion of foundation ditch and has good stagnant water effect.
Accompanying drawing explanation
Fig. 1 is mini stake Composite Braced Retaining Structure generalized section;
Fig. 2 is mini stake Composite Braced Retaining Structure layout schematic diagram;
In figure, hat beam 1, mini stake 2, agitation pile 3, grouted anchor bar 4, hat beam stirrup 11, the vertical muscle 12 of Guan Liang, mini stake vertical reinforcement 21, mini stake steel pipe 24, transverse reinforcement 23, cement mortar 22; Agitation pile steel pipe 32, Deep-stirred Soil-cement body 31, grouted anchor bar reinforcing bar 42, end grappling steel plate 43, injecting cement paste 41.
The specific embodiment
Mini stake Composite Braced Retaining Structure, comprise hat beam 1, mini stake 2, agitation pile 3 and grouted anchor bar 4, hat beam 1 is connected to form by hat beam stirrup 11 and the vertical muscle 12 of Guan Liang, described mini stake 2 is interior is arranged symmetrically with two mini stake vertical reinforcements 21 and a mini stake steel pipe 24 along pile center, two mini stake vertical reinforcements 21 and mini stake steel pipe 24 distance is each other 0.6-0.9d, and d is mini stake stake footpath; Vertically 2-4 m in interval is fixing with transverse reinforcement 23 for two mini stake vertical reinforcements 21 and a mini stake steel pipe 24, and mini stake vertical reinforcement 21, mini stake steel pipe 24 form reinforcing cage, joints cement mortar 22 on reinforcing cage with transverse reinforcement 23; The agitation pile steel pipe 32 that agitation pile 3 is built Deep-stirred Soil-cement body 31 by Deep-stirred Soil-cement body 31 and insertion forms; Grouted anchor bar 4 is built injecting cement paste 41 and is formed after being connected with end grappling steel plate 43 by grouted anchor bar reinforcing bar 42; The top of mini stake vertical reinforcement 21, mini stake steel pipe 24 and agitation pile steel pipe 32 is all connected with hat beam stirrup 11, and mini stake 2 is all connected with hat beam 1 with agitation pile 3; Grouted anchor bar reinforcing bar 42 is connected with agitation pile steel pipe 32 with vertical reinforcement 21 respectively, and grouted anchor bar 4 is connected with mini stake 2 and agitation pile 3 respectively.
In described agitation pile, steel pipe 32 length are not less than the length of Deep-stirred Soil-cement body 31, and the diameter of described cement mixing method 3 is D, and adjacent cement mixing method 3 overlaps mutually, and the width of overlap joint is 0.2-0.4D.
The construction method of mini stake Composite Braced Retaining Structure, comprises the following steps:
1, around foundation ditch, excavate groove, cutting depth is more than or equal to the design height of being preced with beam 1;
2, select fixed pile position, carry out pile crown location, select geology exploratory drilling rig or jumbolter, hole by minor diameter hollow drill bit, adopt the mode of mud off to protect a hole when boring, the diameter d of mini stake 2 is 20cm-40cm;
3, fixing reinforcing cage, vertically 2-4 m in interval is fixing with transverse reinforcement 23 for the mini stake vertical reinforcement 21 of two and a mini stake steel pipe 24, and mini stake vertical reinforcement 21, mini stake steel pipe 24 form reinforcing cage with transverse reinforcement 23;
4, the reinforcing cage fixing is put into a hole, reinforcing cage upper end reserves 20-40cm to be connected with reinforcing bar in hat beam 1, mini the vertical reinforcement 21 of two and the distance at a mini stake steel pipe 24 and mini stake 2 centers are 0.4-0.45 times of mini stake diameter d, meanwhile, agitation pile steel pipe 32 ends filter parcel in order to avoid stop up;
5, in stake hole, inject clear water by plastic pipe by Grouting Pipe, returning out concentration of slurry when top, stake hole is 1.00g/cm
3-1.05 g/cm
3time, stopping injecting clear water, and pour into cement mortar in stake hole, strength of cement mortar is M20;
6, after mortar is filled to design height, place more than 7 days, carry out slip casing by pressure, the water/binder ratio of cement paste is 0.5-1.0 (g/g), stops slip casting in the time that top, stake hole has cement paste to emerge;
7, mixing pile construction: building diameter D is 40-85cm Deep-stirred Soil-cement body 31, be preferably 0-2m with mini stake clear spacing, stake is long should be greater than at least 3m of cutting depth, after completing, steel pipe 32 is inserted to not solidified Deep-stirred Soil-cement body 31, before being pressed into, the reserved aperture of steel pipe walls is wrapped up, in order to avoid aperture is blocked by cement paste, place more than 7 days, aperture is carried out to slip casing by pressure;
8, the grouted anchor bar 4 tilting is constructed, after drilling construction completes, reinforcing bar is inserted and injects cement grout along the hole heart;
9, after finishing, mini stake and mixing pile construction be preced with the construction of beam 1, the mini stake vertical reinforcement 21 on two, mini stake 2 top and mini stake steel pipe 24 and agitation pile steel pipe 32 are welded with hat beam stirrup 11, after having welded, carry out concrete building and maintenance.
In described step 1, hat beam 1 top is located at below earth's surface, and the above soil body of hat beam 1 adopts part to put domatic formula.
In described step 6 and 7, grouting pressure is controlled at 1-5MPa.
The present invention is described in further detail with the specific embodiment below in conjunction with accompanying drawing 1 and accompanying drawing 2:
embodiment 1
As shown in Figure 1 and Figure 2, the mini stake of the present invention Composite Braced Retaining Structure, comprise hat beam 1, mini stake 2, agitation pile 3 and grouted anchor bar 4, hat beam 1 is connected to form by hat beam stirrup 11 and the vertical muscle 12 of Guan Liang, described mini stake 2 is interior is arranged symmetrically with two mini stake vertical reinforcements 21 and a mini stake steel pipe 24 along pile center, two mini stake vertical reinforcements 21 and mini stake steel pipe 24 distance is each other 0.6-0.9d, and d is mini stake stake footpath; Vertically interval 2m is fixing with transverse reinforcement 23 for two mini stake vertical reinforcements 21 and a mini stake steel pipe 24, and mini stake vertical reinforcement 21, mini stake steel pipe 24 form reinforcing cage, joints cement mortar 22 on reinforcing cage with transverse reinforcement 23; The agitation pile steel pipe 32 that agitation pile 3 is built Deep-stirred Soil-cement body 31 by Deep-stirred Soil-cement body 31 and insertion forms; Grouted anchor bar 4 is built injecting cement paste 41 and is formed after being connected with end grappling steel plate 43 by grouted anchor bar reinforcing bar 42; The top of mini stake vertical reinforcement 21, mini stake steel pipe 24 and agitation pile steel pipe 32 is all connected with hat beam stirrup 11, and mini stake 2 is all connected with hat beam 1 with agitation pile 3; Grouted anchor bar reinforcing bar 42 is connected with agitation pile steel pipe 32 with vertical reinforcement 21 respectively, and grouted anchor bar 4 is connected with mini stake 2 and agitation pile 3 respectively.
In agitation pile, steel pipe 32 length are not less than the length of Deep-stirred Soil-cement body 31, and the diameter of described cement mixing method 3 is D, and adjacent cement mixing method 3 overlaps mutually, and the width of overlap joint is 0.2D.
The construction method of mini stake Composite Braced Retaining Structure, comprises the following steps:
1, around foundation ditch, excavate groove, cutting depth is more than or equal to the design height of being preced with beam 1;
2, select fixed pile position, carry out pile crown location, select geology exploratory drilling rig or jumbolter, hole by minor diameter hollow drill bit, adopt the mode of mud off to protect a hole when boring, the diameter d of mini stake 2 is 20cm;
3, fixing reinforcing cage, vertically interval 2 m are fixing with transverse reinforcement 23 for the mini stake vertical reinforcement 21 of two and a mini stake steel pipe 24, and mini stake vertical reinforcement 21, mini stake steel pipe 24 form reinforcing cage with transverse reinforcement 23;
4, the reinforcing cage fixing is put into a hole, reinforcing cage upper end reserves 20cm to be connected with reinforcing bar in hat beam 1, mini the vertical reinforcement 21 of two and the distance at a mini stake steel pipe 24 and mini stake 2 centers are 0.4-0.45 times of mini stake diameter d, meanwhile, agitation pile steel pipe 32 ends filter parcel in order to avoid stop up;
5, in stake hole, inject clear water by plastic pipe by Grouting Pipe, returning out concentration of slurry when top, stake hole is 1.00g/cm
3-1.05 g/cm
3time, stopping injecting clear water, and pour into cement mortar in stake hole, strength of cement mortar is M20;
6, after mortar is filled to design height, place more than 7 days, carry out slip casing by pressure, the water/binder ratio of cement paste is 0.5 (g/g), stops slip casting in the time that top, stake hole has cement paste to emerge;
7, mixing pile construction: building diameter D is 40cm Deep-stirred Soil-cement body 31, be preferably 0-2m with mini stake clear spacing, the long cutting depth that should be greater than of stake is 3m, after completing, steel pipe 32 is inserted to not solidified Deep-stirred Soil-cement body 31, before being pressed into, the reserved aperture of steel pipe walls is wrapped up, in order to avoid aperture is blocked by cement paste, place more than 7 days, aperture is carried out to slip casing by pressure;
8, the grouted anchor bar 4 tilting is constructed, after drilling construction completes, reinforcing bar is inserted and injects cement grout along the hole heart;
9, after finishing, mini stake and mixing pile construction be preced with the construction of beam 1, the mini stake vertical reinforcement 21 on two, mini stake 2 top and mini stake steel pipe 24 and agitation pile steel pipe 32 are welded with hat beam stirrup 11, after having welded, carry out concrete building and maintenance.
In described step 1, hat beam 1 top is located at below earth's surface, and the above soil body of hat beam 1 adopts part to put domatic formula.
In described step 6 and 7, grouting pressure is controlled at 1-5MPa.
As shown in Figure 1 and Figure 2, the mini stake of the present invention Composite Braced Retaining Structure, comprise hat beam 1, mini stake 2, agitation pile 3 and grouted anchor bar 4, hat beam 1 is connected to form by hat beam stirrup 11 and the vertical muscle 12 of Guan Liang, described mini stake 2 is interior is arranged symmetrically with two mini stake vertical reinforcements 21 and a mini stake steel pipe 24 along pile center, two mini stake vertical reinforcements 21 and mini stake steel pipe 24 distance is each other 0.6-0.9d, and d is mini stake stake footpath; Vertically interval 4 m are fixing with transverse reinforcement 23 for two mini stake vertical reinforcements 21 and a mini stake steel pipe 24, and mini stake vertical reinforcement 21, mini stake steel pipe 24 form reinforcing cage, joints cement mortar 22 on reinforcing cage with transverse reinforcement 23; The agitation pile steel pipe 32 that agitation pile 3 is built Deep-stirred Soil-cement body 31 by Deep-stirred Soil-cement body 31 and insertion forms; Grouted anchor bar 4 is built injecting cement paste 41 and is formed after being connected with end grappling steel plate 43 by grouted anchor bar reinforcing bar 42; The top of mini stake vertical reinforcement 21, mini stake steel pipe 24 and agitation pile steel pipe 32 is all connected with hat beam stirrup 11, and mini stake 2 is all connected with hat beam 1 with agitation pile 3; Grouted anchor bar reinforcing bar 42 is connected with agitation pile steel pipe 32 with vertical reinforcement 21 respectively, and grouted anchor bar 4 is connected with mini stake 2 and agitation pile 3 respectively.
In described agitation pile, steel pipe 32 length are not less than the length of Deep-stirred Soil-cement body 31, and the diameter of described cement mixing method 3 is D, and adjacent cement mixing method 3 overlaps mutually, and the width of overlap joint is 0.4D.
The construction method of mini stake Composite Braced Retaining Structure, comprises the following steps:
1, around foundation ditch, excavate groove, cutting depth is more than or equal to the design height of being preced with beam 1;
2, select fixed pile position, carry out pile crown location, select geology exploratory drilling rig or jumbolter, hole by minor diameter hollow drill bit, adopt the mode of mud off to protect a hole when boring, the diameter d of mini stake 2 is 40cm;
3, fixing reinforcing cage, vertically interval 4 m are fixing with transverse reinforcement 23 for the mini stake vertical reinforcement 21 of two and a mini stake steel pipe 24, and mini stake vertical reinforcement 21, mini stake steel pipe 24 form reinforcing cage with transverse reinforcement 23;
4, the reinforcing cage fixing is put into a hole, reinforcing cage upper end reserves 40cm to be connected with reinforcing bar in hat beam 1, mini the vertical reinforcement 21 of two and the distance at a mini stake steel pipe 24 and mini stake 2 centers are 0.4-0.45 times of mini stake diameter d, meanwhile, agitation pile steel pipe 32 ends filter parcel in order to avoid stop up;
5, in stake hole, inject clear water by plastic pipe by Grouting Pipe, returning out concentration of slurry when top, stake hole is 1.00g/cm
3-1.05 g/cm
3time, stopping injecting clear water, and pour into cement mortar in stake hole, strength of cement mortar is M20;
6, after mortar is filled to design height, place more than 7 days, carry out slip casing by pressure, the water/binder ratio of cement paste is 1.0 (g/g), stops slip casting in the time that top, stake hole has cement paste to emerge;
7, mixing pile construction: building diameter D is 85cm Deep-stirred Soil-cement body 31, be preferably 0-2m with mini stake clear spacing, the long cutting depth that should be greater than of stake is 3m, after completing, steel pipe 32 is inserted to not solidified Deep-stirred Soil-cement body 31, before being pressed into, the reserved aperture of steel pipe walls is wrapped up, in order to avoid aperture is blocked by cement paste, place more than 7 days, aperture is carried out to slip casing by pressure;
8, the grouted anchor bar 4 tilting is constructed, after drilling construction completes, reinforcing bar is inserted and injects cement grout along the hole heart;
9, after finishing, mini stake and mixing pile construction be preced with the construction of beam 1, the mini stake vertical reinforcement 21 on two, mini stake 2 top and mini stake steel pipe 24 and agitation pile steel pipe 32 are welded with hat beam stirrup 11, after having welded, carry out concrete building and maintenance.
In described step 1, hat beam 1 top is located at below earth's surface, and the above soil body of hat beam 1 adopts part to put domatic formula.
In described step 6 and 7, grouting pressure is controlled at 1-5MPa.
Claims (5)
1. one kind mini stake Composite Braced Retaining Structure, it is characterized in that, comprise Guan Liang (1), mini stake (2), agitation pile (3) and grouted anchor bar (4), Guan Liang (1) is connected to form by hat beam stirrup (11) and the vertical muscle (12) of Guan Liang, in described mini stake (2), be arranged symmetrically with two mini stake vertical reinforcements (21) and a mini stake steel pipe (24) along pile center, two mini stake vertical reinforcements (21) and a mini stake steel pipe (24) distance are each other 0.6-0.9d, and d is mini stake stake footpath; Two mini stake vertical reinforcements (21) and a mini stake steel pipe (24) vertically interval 2-4 for m transverse reinforcement (23) fix, mini stake vertical reinforcement (21), mini stake steel pipe (24) and transverse reinforcement (23) composition reinforcing cage, joints cement mortar (22) on reinforcing cage; The agitation pile steel pipe (32) that agitation pile (3) is built Deep-stirred Soil-cement body (31) by Deep-stirred Soil-cement body (31) and insertion forms; After grouted anchor bar (4) is connected with end grappling steel plate (43) by grouted anchor bar reinforcing bar (42), builds injecting cement paste (41) and form; The top of mini stake vertical reinforcement (21), mini stake steel pipe (24) and agitation pile steel pipe (32) is all connected with hat beam stirrup (11), and mini stake (2) is all connected with Guan Liang (1) with agitation pile (3); Grouted anchor bar reinforcing bar (42) is connected with agitation pile steel pipe (32) with vertical reinforcement (21) respectively, and grouted anchor bar (4) is connected with mini stake (2) and agitation pile (3) respectively.
2. mini stake Composite Braced Retaining Structure according to claim 1, it is characterized in that: in described agitation pile, steel pipe (32) length is not less than the length of Deep-stirred Soil-cement body (31), the diameter of described cement mixing method (3) is D, adjacent cement mixing method (3) overlaps mutually, and the width of overlap joint is 0.2-0.4D.
3. the construction method of mini stake Composite Braced Retaining Structure according to claim 1, is characterized in that: comprise the following steps:
A, around foundation ditch, excavate groove, cutting depth is more than or equal to the design height of Guan Liang (1);
B, select fixed pile position, carry out pile crown location, select geology exploratory drilling rig or jumbolter, hole by minor diameter hollow drill bit, adopt the mode of mud off to protect a hole when boring, the diameter d of mini stake (2) is 20cm-40cm;
C, fixing reinforcing cage, the mini stake vertical reinforcement (21) of two and a mini stake steel pipe (24) vertically interval 2-4 m for transverse reinforcement (23) fixing, mini stake vertical reinforcement (21), mini stake steel pipe (24) and transverse reinforcement (23) form reinforcing cage;
D, the reinforcing cage fixing is put into a hole, reinforcing cage upper end reserves 20-40cm to be connected with reinforcing bar in Guan Liang (1), the distance at mini the vertical reinforcement (21) of two and a mini stake steel pipe (24) and mini stake (2) center is 0.4-0.45 times of mini stake diameter d, meanwhile, agitation pile steel pipe (32) end filters parcel in order to avoid stops up;
E, in stake hole, inject clear water by plastic pipe by Grouting Pipe, returning out concentration of slurry when top, stake hole is 1.00g/cm
3-1.05 g/cm
3time, stopping injecting clear water, and pour into cement mortar in stake hole, strength of cement mortar is M20;
F, after mortar is filled to design height, place more than 7 days, carry out slip casing by pressure, the water/binder ratio of cement paste is 0.5-1.0 (g/g), stops slip casting in the time that top, stake hole has cement paste to emerge;
G, mixing pile construction: building diameter D is 40-85cm Deep-stirred Soil-cement body (31), be preferably 0-2m with mini stake clear spacing, stake is long should be greater than at least 3m of cutting depth, after completing, steel pipe (32) is inserted to not solidified Deep-stirred Soil-cement body (31), before being pressed into, the reserved aperture of steel pipe walls is wrapped up, in order to avoid aperture is blocked by cement paste, place more than 7 days, aperture is carried out to slip casing by pressure;
H, the grouted anchor bar (4) tilting is constructed, after drilling construction completes, reinforcing bar is inserted and injects cement grout along the hole heart;
I, after finishing, mini stake and mixing pile construction carry out the construction of Guan Liang (1), the mini stake vertical reinforcement (21) on two, mini stake (2) top and a mini stake steel pipe (24) and agitation pile steel pipe (32) are welded with being preced with beam stirrup (11), after having welded, carry out concrete building and maintenance.
4. mini stake Composite Braced Retaining Structure construction method according to claim 3, is characterized in that: in described step a, Guan Liang (1) top is located at below earth's surface, and the above soil body of Guan Liang (1) adopts part to put domatic formula.
5. mini stake Composite Braced Retaining Structure construction method according to claim 3, is characterized in that: in described step f and g, grouting pressure is controlled at 1-5MPa.
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| CN105113522A (en) * | 2015-09-22 | 2015-12-02 | 河南万泰建安开发有限公司 | Space composite supporting structure |
| CN105926651A (en) * | 2016-07-01 | 2016-09-07 | 杭州江润科技有限公司 | Comprehensive supporting structure of deep side slope of complex steep cliff and construction method |
| CN106759376A (en) * | 2016-12-21 | 2017-05-31 | 大连交通大学 | Anchored Sheet Pile Wall for Excavation system and its construction method for closing on existing underground structure |
| CN107217662A (en) * | 2017-05-23 | 2017-09-29 | 梁美欣 | Pilework |
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| CN105926651B (en) * | 2016-07-01 | 2018-01-16 | 杭州江润科技有限公司 | Complicated precipitous precipice depth side slope comprehensive support structure and construction method |
| CN106759376B (en) * | 2016-12-21 | 2018-11-30 | 大连交通大学 | For closing on the construction method of the Anchored Sheet Pile Wall for Excavation system of existing underground structure |
| CN106759376A (en) * | 2016-12-21 | 2017-05-31 | 大连交通大学 | Anchored Sheet Pile Wall for Excavation system and its construction method for closing on existing underground structure |
| CN107217662A (en) * | 2017-05-23 | 2017-09-29 | 梁美欣 | Pilework |
| CN108301419A (en) * | 2018-03-18 | 2018-07-20 | 中铁十九局集团第三工程有限公司 | The Double-row Piles Support system and construction method of the local soft soil property of foundation pit can be overcome |
| CN109371985A (en) * | 2018-05-28 | 2019-02-22 | 中南大学 | A kind of foundation pit supporting method for recent fill |
| CN109056649A (en) * | 2018-09-10 | 2018-12-21 | 无锡市水利设计研究院有限公司 | A kind of sheet pile combination shore protection and its construction method |
| CN110219330A (en) * | 2019-06-12 | 2019-09-10 | 北京科技大学 | A kind of headframe reinforcement and rectification Treatment Methods based on root pile |
| CN110219330B (en) * | 2019-06-12 | 2020-07-28 | 北京科技大学 | Pit tower reinforcement and deviation rectification treatment method based on tree root piles |
| CN110835917A (en) * | 2019-10-23 | 2020-02-25 | 江苏兴厦建设工程集团有限公司 | Multidirectional rotary-spraying stirring straight-inclined alternating supporting structure and supporting method |
| CN111287199A (en) * | 2020-03-25 | 2020-06-16 | 汪龙杰 | Super high-rise building deep foundation pit and construction method thereof |
| CN112878358A (en) * | 2020-09-13 | 2021-06-01 | 湖南城市学院 | Existing retaining wall reinforcing construction method and reinforcing structure thereof |
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