CN102605792B - Multi-row mini-pile enclosing structure for blocking soil and construction process - Google Patents
Multi-row mini-pile enclosing structure for blocking soil and construction process Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000010276 construction Methods 0.000 title claims abstract description 40
- 239000002689 soil Substances 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 title abstract description 4
- 230000000903 blocking effect Effects 0.000 title abstract 3
- 239000004568 cement Substances 0.000 claims abstract description 67
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 62
- 230000002787 reinforcement Effects 0.000 claims description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000004033 plastic Substances 0.000 claims description 16
- 229920003023 plastic Polymers 0.000 claims description 16
- 238000005516 engineering process Methods 0.000 claims description 15
- 238000007569 slipcasting Methods 0.000 claims description 15
- 239000011230 binding agent Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 5
- 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 description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 20
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- 230000003993 interaction Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 5
- 210000003205 muscle Anatomy 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
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Abstract
The invention relates to the field of foundation bases and discloses a multi-row mini-pile enclosing structure for blocking soil and a construction process. The multi-row mini-pile enclosing structure for blocking soil comprises a top beam (2) and more than two rows of mini piles (2), the mini piles (2) comprise front-row piles (21) and rear-row piles (22), cement stirring piles (3) are arranged between the front-row piles and the rear-row piles (22), and the top ends of the mini piles (2) are connected together by the top beam (1). The construction process comprises the steps of digging grooves, positioning pile heads, drilling, grouting, casting and the like. The multi-row piles have the advantages that the whole performance is good, the anti-bending rigidity is high, the lateral deformation of a foundation pit and the surface subsidence of the periphery of the foundation pit can be effectively controlled by an inner support or an anti-pulling anchor rod, the construction time can be saved well and the construction cost is reduced.
Description
Technical field
The present invention relates to foundation field, relate in particular to the mini Zhuan Dang fortifield village's protection structure of many rows and construction technology.
Background technology
In order to reduce the impact of excavation of foundation pit on surrounding environment, at present, fender post is widely used in bracing of foundation pit, for single stake, because its anti-bending strength is poor, therefore, be difficult to the displacement of stake top effectively to control, in order to reduce as much as possible the impact of excavation of foundation pit on surrounding environment, the double-row pile with higher anti-bending strength is widely used.Traditional double-row pile is mainly to adopt bored pile and preformed pile, yet, in view of the situation of current land used anxiety, construction plant condition also becomes an essential condition that affects fender post type, and therefore the construction for bored pile and preformed pile has had larger challenge.And for the construction of mini stake, because its rig used is geological prospecting rig or jumbolter, take up room less, when therefore mini stake can be restricted on construction ground, construct.Meanwhile, the mini stake of the type is owing to adopting the construction method of reinforcing bar+rubble+cement paste, and with respect to the construction technology of traditional fender post, this mini stake type has reduced the consumption of material effectively, thereby the utilization that makes mini stake more economically.For mini stake, because its footpath is less and need place in advance reinforcing bar, when adopting tremie to pour into, difficulty of construction is higher and construction cost is higher.The construction technology of the mini stake of tradition is to adopt one or more high performance steel to be positioned over drill center slip casting around reinforcing bar, because the stressed of this mini stake mainly born by high performance steel, and when reinforcing bar during in center its bending rigidity less, therefore for Foundation Pit Support Engineering, need to adopt the stake type with higher bending rigidity.
Summary of the invention
The present invention is directed in existing bracing of foundation pit technology because construction plant around foundation ditch is limited, the construction of tradition fender post cannot launch, and the shortcoming such as common mini stake bending rigidity is little, provide two reinforcing bars of a kind of employing along placing perpendicular to foundation pit walls direction, give full play to the anti-bending strength of reinforcing bar, thereby improved the bending rigidity of the mini stake of the type; While adopting multiline pile, given full play to overall performance and the three-dimensional effect of combining structure, meanwhile, the mini stake of the type can by bar diameter, type and slip casting concentration etc. because usually controlling the stress performance of mini stake.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
The mini Zhuan Dang of many rows fortifield village protection structure, comprises the mini stake that Guan Liang and two rows are above, and described mini stake comprises and front campshed and rear campshed are provided with cement mixing method between front campshed and rear campshed, and the top of mini links together by Guan Liang.
As preferably, in described hat beam, be provided with the vertical muscle of hat beam stirrup and Guan Liang, hat beam stirrup is connected with the vertical reinforcement arranging in mini stake.
As preferably, in described mini stake, be provided with two along foundation ditch direction, the vertical reinforcement being arranged symmetrically with, the distance between vertical reinforcement is 0.6-0.9d, d is mini stake stake footpath; Between two vertical reinforcements, vertically interval 2-4m fixes with transverse reinforcement, and vertical reinforcement and transverse reinforcement form reinforcing cage.
As preferably, described cement mixing method is arranged on the side near front campshed, and between front campshed and rear campshed, stake position is interspersed or is plum blossom-shaped distribution.
As preferably, 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 mini Zhuan Dang of many rows fortifield village protects construction technology, comprises the following steps:
A, at foundation ditch, around excavate groove, cutting depth is more than or equal to the design height of Guan Liang;
B, select fixed pile position, carry out pile crown location, select geology exploratory drilling rig or jumbolter, by minor diameter hollow drill bit, hole, in the time of boring, adopt the mode of mud off to protect a hole, different rows' mini stake stake position is interlaced arrangement, and the diameter d of mini stake is 20cm-40cm;
C, the reinforcing bar fixing is put into a hole after having holed, adopt two vertical reinforcements to place along foundation ditch direction is symmetrical, two vertical reinforcements are longitudinally fixed with transverse reinforcement every 2-3m, reinforcing cage upper end reserves 20-40cm to be connected with reinforcing bar in hat beam, the spacing of two vertical reinforcements is 0.6-0.9 times of mini stake diameter d, meanwhile, the plastic pipe that is 20-30mm by diameter is tied up at reinforcing cage bottom; Reinforcing cage upper end reserves 20-40cm to be connected with reinforcing bar in hat beam, its distance of two vertical reinforcements be mini stake diameter d 0.6-0.9 doubly, its main purpose is that reinforcing bar is around surrounded by rubble, the while is brought into play again the anti-bending strength of reinforcing bar as far as possible.
D, with grouting device, by plastic pipe, in stake hole, inject clear water, when top, stake hole, returning out concentration of slurry is 1.00g/cm
3-1.05g/cm
3time, stopping injecting clear water, and in stake hole, pour into rubble immediately, rubble diameter is 1cm-3cm;
E, when rubble is filled to design height, by prepositioned plastic pipe, slip casting is carried out to behind clear hole again in stake hole, the water/binder ratio of cement paste is 0.3-0.5:1, stops slip casting when top, stake hole has cement paste to emerge;
It is 40-60cm stake type that f, cement mixing method adopt diameter D, and cement mixing method position is near front campshed one side; When soil property is poor or sealing is had relatively high expectations, can adopt many row's cement mixing methods.
G, after mini stake and cement mixing pile driving construction finish, carry out the construction of Guan Liang, first mini stake upper reinforcement vertical reinforcement is welded with the hat beam stirrup of hat beam inside, after having welded, carry out concrete building and maintenance.Hat depth of beam is 30-50cm, and the width of Guan Liang is for to flush with the edge of stake, or exceeds the edge 20-30cm of stake, and in hat beam, reinforcement placement is double-deck elongated layout.For the design of Guan Liang, generally to consider two interaction forces between mini stake, by the interaction force calculating between two campsheds, determine the configuration of being preced with the inner reinforcing bar of beam.
In step b, construction for mini stake adopts geological prospecting rig or jumbolter, can around construct at the limited foundation ditch of site condition, according to design, on position, stake position, carry out pile crown location, by minor diameter hollow drill bit, hole, boring simultaneously adopts the mode of mud off to protect a hole, the retaining wall mode of mud off using method and traditional bored pile is similar, between adjacent mini stake, adopt quincuncial arrangement, be to be interspersed between front campshed and rear campshed, line after front campshed and its immediate two between campshed forms triangle.For the type, make its diameter of the mini stake of bracing of foundation pit and generally get 20cm-40cm.In step c, after having holed, the reinforcing bar fixing is put into projected depth, two reinforcing bars are placed along foundation ditch direction is symmetrical, between two reinforcing bars, every 2-3m, with transverse reinforcement, fix, reinforcing cage upper end reserves 30-40cm to be connected with reinforcing bar in hat beam, and two its distances of vertical reinforcement are 0.6-0.9d, its main purpose is that reinforcing bar is around surrounded by rubble, bring into play again the anti-bending strength of reinforcing bar as far as possible, meanwhile, diameter is about to 20-30mm common plastics tube and ties up at reinforcing cage bottom simultaneously.
As preferably, in described step a, 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 described step e, grouting pressure is controlled at 0.3-0.5MPa.
As preferably, in described step f, when seepage resistance demand is higher, adopt many row's cement mixing methods.
As preferably, the 2-5 of the diameter D that the row's spacing between described mini stake is cement mixing method doubly, the 0.6-0.8 of the diameter D that the row's spacing between cement mixing method and front campshed is cement mixing method times.
The advantage of multiline pile of the present invention is that overall performance is good and bending rigidity is high, does not need inner support or tension anchor pole just can effectively control lateral deformation and the foundation ditch surface settlement around of foundation ditch.Meanwhile, the required construction machinery of the type stake is less, low to work plane dimensional requirement, therefore can a plurality of working face construct simultaneously and work progress comparatively simple, can save better the engineering time and reduce construction costs.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is A-A face sectional view in Fig. 1.
Fig. 3 is the structural representation of the embodiment of the present invention 2.
Fig. 4 is B-B face sectional view in Fig. 3.
Wherein 1-Guan Liang, 2-mini stake, 3-cement mixing method, 4-soil, 11-hat beam stirrup, vertical muscle, 21-front campshed, the 22-rear campshed of 12-Guan Liang, 23-vertical reinforcement, 24-transverse reinforcement.
The specific embodiment
Below in conjunction with accompanying drawing 1 to accompanying drawing 2 and the specific embodiment, the present invention is described in further detail:
Embodiment 1
The mini Zhuan Dang of many rows fortifield village protection structure, as shown in Figure 1 to Figure 2, comprise the mini stake 2 that hat beam 1 and two rows are above, described mini stake 2 comprises front campshed 21 and rear campshed 22, between front campshed 21 and rear campshed 22, be provided with cement mixing method 3, the top of mini stake 2 links together by hat beam 1.Multiline pile connects formation Unified Global with hat beam 3, and rear campshed 22 is delivered to front campshed 21 by part lateral earth pressure by hat beam 3 and inter-pile soil, and passive area provides lateral pressure; Meanwhile, front campshed 21 bears pressure, and rear campshed 22 bearing tensions, produce certain moment of flexure, finally make this space enclosing structure have higher resistance to capsizing.
In hat beam 1, be provided with hat beam stirrup 11 and the vertical muscle 12 of Guan Liang, hat beam stirrup 11 is connected with the vertical reinforcement 23 of mini stake 2 interior settings.Hat beam inside is put into main muscle along foundation pit walls direction and is preced with beam stirrup 11, and hat beam stirrup 11 is arranged symmetrically with, and mainly bears the moment of flexure of horizontal direction, as shown in Figure 1; And mini stake 2 top vertical reinforcements 23 are connected with it, the interior vertical muscle of the Guan Liang parallel with foundation pit walls direction of simultaneously putting into of hat beam 3, quantity of reinforcement should be coordinated comprehensively to determine according to the rigidity of the bending resistance requirement of hat beam and mini stake and Guan Liang.
In mini stake 2, be provided with two along foundation ditch direction, the vertical reinforcement 23 being arranged symmetrically with, the distance between vertical reinforcement 23 is 0.6-0.9d, d is mini stake stake footpath; Between two vertical reinforcements 23, vertically interval 2-4m is fixing with transverse reinforcement 24, and vertical reinforcement 23 forms reinforcing cage with transverse reinforcement 24.
The diameter of cement mixing method 3 is D, and adjacent cement mixing method 3 overlaps mutually, and the width of overlap joint is 0.2D.Because cement mixing method 3 can be resisted Groundwater infiltration foundation ditch, if do not overlapped, water can flow into foundation ditch the gap between agitation pile, therefore, by cement mixing pile 3 is overlapped, form complete enclosed water-stop curtain together, can effectively resist Groundwater infiltration foundation ditch.
The mini Zhuan Dang of many rows fortifield village protects construction technology, comprises the following steps:
A, at foundation ditch, around excavate groove, cutting depth is more than or equal to the design height of hat beam 1;
B, select fixed pile position, carry out pile crown location, select geology exploratory drilling rig or jumbolter, by minor diameter hollow drill bit, hole, in the time of boring, adopt the mode of mud off to protect a hole, 2 positions of mini stake of different rows are interlaced arrangement, and the diameter d of mini stake 2 is 25cm; Boring adopts the mode of mud off to protect a hole simultaneously; during boring, by hollow drill bit water filling, control concentration of hydraulic mixture; the retaining wall mode of mud off mode of occupation and traditional bored pile is similar; between adjacent two rows' mini stake 2, be arranged crosswise, three adjacent mini stakes are quincuncial arrangement.
C, the reinforcing bar fixing is put into a hole after having holed, adopt two vertical reinforcements 23 to place along foundation ditch direction is symmetrical, two vertical reinforcements 23 are longitudinally fixing with transverse reinforcement 24 every 2m, reinforcing cage upper end reserves 20cm to be connected with reinforcing bar in hat beam 1, the spacing of two vertical reinforcements 23 is 0.7 times of mini stake diameter d, meanwhile, the plastic pipe that is 20mm by diameter is tied up at reinforcing cage bottom; Reinforcing cage upper end reserves 20cm to be connected with reinforcing bar in hat beam 1, and its distance of two vertical reinforcements be 0.7 times of mini stake diameter d, and its main purpose is that reinforcing bar is around surrounded by rubble, and the while is brought into play again the anti-bending strength of reinforcing bar as far as possible.
D, with grouting device, by plastic pipe, in stake hole, inject clear water, when top, stake hole, returning out concentration of slurry is 1.00g/cm
3time, stopping injecting clear water, and in stake hole, pour into rubble immediately, rubble diameter is 2cm;
E, when rubble is filled to design height, by prepositioned plastic pipe, slip casting is carried out to behind clear hole again in stake hole, the water/binder ratio of cement paste is 0.3:1, stops slip casting when top, stake hole has cement paste to emerge; When rubble is filled to design height, by prepositioned plastic pipe, slip casting is carried out to behind clear hole again in stake hole, the water/binder ratio of cement paste is 0.3:1, stops slip casting when top, stake hole has cement paste to emerge; For different formation conditions, can configure different water/binder ratio, when infiltration condition is better, should reduce water/binder ratio, grouting pressure general control is at 0.3MPa.
It is 40cm stake type that f, cement mixing method 3 adopt diameter D, and cement mixing method 3 positions are near front campshed 21 1 sides; Cement mixing method diameter and pile spacing require to design according to antiseepage, cement mixing method position is near front campshed one side, when soil property is poor or sealing is had relatively high expectations, when mini stake 2 is many rows, can adopt many row's cement mixing methods 3, many row's cement mixing methods are set to reach better anti-seepage effect.
G, after mini stake and cement mixing pile driving construction finish, be preced with the construction of beam 1, first mini stake 2 upper reinforcement vertical reinforcements 23 welded with the hat beam stirrup 11 of hat beam 1 inside, after having welded, carry out concrete building and maintenance.The height of hat beam 1 is 30cm, and the width of hat beam 1 is for to flush with the edge of stake, and in hat beam 1, reinforcement placement is double-deck elongated layout, and reinforcing bar mainly bears level to bending resistance, and reinforcement placement plan view as shown in Figure 1.For the design of Guan Liang, generally to consider two interaction forces between mini stake, by the interaction force calculating between two campsheds, determine the configuration of being preced with the inner reinforcing bar of beam.The Main Function of Guan Liang is to connect into Unified Global by arranging mini stake more, after excavation of foundation pit, after bearing lateral earth pressure, there is lateral deformation in rear campshed, rear campshed is transferred to front campshed by Guan Liang and inter-pile soil by part lateral earth pressure, by front and back campshed shared lateral earth pressure, and rear campshed bearing tension, front-seat pile is stressed, thereby has improved the resistance to capsizing of stake.For the design of Guan Liang, generally to consider two interaction forces between mini stake, by the interaction force calculating between two campsheds, determine the configuration of being preced with the inner reinforcing bar of beam.
In step b, construction for mini stake adopts geological prospecting rig or jumbolter, can around construct at the limited foundation ditch of site condition, according to design, on position, stake position, carry out pile crown location, by minor diameter hollow drill bit, hole, boring simultaneously adopts the mode of mud off to protect a hole, the retaining wall mode of mud off using method and traditional bored pile is similar, between adjacent mini stake 2, adopt quincuncial arrangement, be to be interspersed between front campshed and rear campshed, line after front campshed 21 and its immediate two between campshed 22 forms triangle.In step a, 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 step e, grouting pressure is controlled at 0.3MPa.
In step f, when seepage resistance demand is higher, adopt many row's cement mixing methods 3.
Row's spacing between mini stake 2 be cement mixing method 3 diameter D 2-5 doubly, the row's spacing between cement mixing method 3 and front campshed 21 is 0.6-0.8 times of diameter D of cement mixing method 3.In the present invention, mini stake adopts the method for pile body reinforcing bar+rubble+slip casting, use this pile-formation process can control by changing bar diameter the bending rigidity of pile body, than small diameter steel pipe piles, the connection between stake and hat beam is more easily carried out in the mini stake of the type, for identical pile body bending rigidity, the mini stake of the type more economically simultaneously.The performance mechanism of this multiline pile combining structure is, passive area provides lateral pressure inside foundation ditch, and front campshed is stressed is pressure, and rear campshed is stressed is pulling force, under three kinds of power effects, makes this combining structure have better resistance to capsizing.The pile of the type stake is convenient, do not need ready-mixed concrete, and solved the comparatively problem of trouble of paxilla footpath pile concrete pouring, simultaneously, loading characteristic in conjunction with stake, adopt two reinforcing bars along being arranged symmetrically with perpendicular to foundation pit walls direction, given full play to the anti-bending strength of reinforcing bar, saved amount of reinforcement and made simple.
See Fig. 3,4, the present embodiment and embodiment 1 distinguish and are, mini stake 2 is three rows, and cement mixing method 3 is two rows; When the mini stake of first row 2 as front campshed 21 constantly, the mini stake 2 of second row is as rear campshed 22; When the mini stake of second row 2 is during as front campshed 21, the mini stake 2 of the 3rd row is rear campshed 22.When soil property is poor or sealing is had relatively high expectations, adopt the mini stake 2 of many rows, and arrange cement mixing method 3 more, can reach better anti-seepage effect.
The mini Zhuan Dang of many rows fortifield village protects construction technology, comprises the following steps:
A, at foundation ditch, around excavate groove, cutting depth is more than or equal to the design height of hat beam 1;
B, select fixed pile position, carry out pile crown location, select geology exploratory drilling rig or jumbolter, by minor diameter hollow drill bit, hole, in the time of boring, adopt the mode of mud off to protect a hole, 2 positions of mini stake of different rows are interlaced arrangement, and the diameter d of mini stake 2 is 40cm; Boring adopts the mode of mud off to protect a hole simultaneously; during boring, by hollow drill bit water filling, control concentration of hydraulic mixture; the retaining wall mode of mud off mode of occupation and traditional bored pile is similar; between adjacent two rows' mini stake 2, be arranged crosswise, three adjacent mini stakes are quincuncial arrangement.
C, the reinforcing bar fixing is put into a hole after having holed, adopt two vertical reinforcements 23 to place along foundation ditch direction is symmetrical, two vertical reinforcements 23 are longitudinally fixing with transverse reinforcement 24 every 3m, reinforcing cage upper end reserves 30cm to be connected with reinforcing bar in hat beam 1, the spacing of two vertical reinforcements 23 is 0.8 times of mini stake diameter d, meanwhile, the plastic pipe that is 30mm by diameter is tied up at reinforcing cage bottom; Reinforcing cage upper end reserves 30cm to be connected with reinforcing bar in hat beam 1, and its distance of two vertical reinforcements be 0.8 times of mini stake diameter d, and its main purpose is that reinforcing bar is around surrounded by rubble, and the while is brought into play again the anti-bending strength of reinforcing bar as far as possible.
D, with grouting device, by plastic pipe, in stake hole, inject clear water, when top, stake hole, returning out concentration of slurry is 1.03g/cm
3time, stopping injecting clear water, and in stake hole, pour into rubble immediately, rubble diameter is 3cm;
E, when rubble is filled to design height, by prepositioned plastic pipe, slip casting is carried out to behind clear hole again in stake hole, the water/binder ratio of cement paste is 0.4:1, stops slip casting when top, stake hole has cement paste to emerge; When rubble is filled to design height, by prepositioned plastic pipe, slip casting is carried out to behind clear hole again in stake hole, the water/binder ratio of cement paste is 0.4:1, stops slip casting when top, stake hole has cement paste to emerge; For different formation conditions, can configure different water/binder ratio, when infiltration condition is better, should reduce water/binder ratio, grouting pressure general control is at 0.4MPa.
It is 60cm stake type that f, cement mixing method 3 adopt diameter D, and cement mixing method 3 positions are near front campshed 21 1 sides; Cement mixing method diameter and pile spacing require to design according to antiseepage, cement mixing method position is near front campshed one side, when soil property is poor or sealing is had relatively high expectations, when mini stake 2 is many rows, can adopt many row's cement mixing methods 3, many row's cement mixing methods are set to reach better anti-seepage effect.
G, after mini stake and cement mixing pile driving construction finish, be preced with the construction of beam 1, first mini stake 2 upper reinforcement vertical reinforcements 23 welded with the hat beam stirrup 11 of hat beam 1 inside, after having welded, carry out concrete building and maintenance.The height of hat beam 1 is 50cm, and the width of hat beam 1 is the edge 30cm that exceeds stake.If the width of hat beam 1 stretches out an edge, stressed favourable to the node of stake top/Guan Liang junction, be not easy to occur the destruction of this local location.If hat beam 1 and 2 edges of mini stake flush setting, more easily occur the destruction of this local location, thereby have influence on whole intensity of keeping off fortifield village's protection structure.In hat beam 1, reinforcement placement is double-deck elongated layout, and reinforcing bar mainly bears level to bending resistance, and reinforcement placement plan view as shown in Figure 1.For the design of Guan Liang, generally to consider two interaction forces between mini stake, by the interaction force calculating between two campsheds, determine the configuration of being preced with the inner reinforcing bar of beam.The Main Function of Guan Liang is to connect into Unified Global by arranging mini stake more, after excavation of foundation pit, after bearing lateral earth pressure, there is lateral deformation in rear campshed, rear campshed is transferred to front campshed by Guan Liang and inter-pile soil by part lateral earth pressure, by front and back campshed shared lateral earth pressure, and rear campshed bearing tension, front-seat pile is stressed, thereby has improved the resistance to capsizing of stake.For the design of Guan Liang, generally to consider two interaction forces between mini stake, by the interaction force calculating between two campsheds, determine the configuration of being preced with the inner reinforcing bar of beam.
In step b, construction for mini stake adopts geological prospecting rig or jumbolter, can around construct at the limited foundation ditch of site condition, according to design, on position, stake position, carry out pile crown location, by minor diameter hollow drill bit, hole, boring simultaneously adopts the mode of mud off to protect a hole, the retaining wall mode of mud off using method and traditional bored pile is similar, between adjacent mini stake 2, adopt quincuncial arrangement, be to be interspersed between front campshed and rear campshed, line after front campshed 21 and its immediate two between campshed 22 forms triangle.For the type, make its diameter of the mini stake of bracing of foundation pit and generally get 40cm.
In step c, after having holed, the reinforcing bar fixing is put into projected depth, two reinforcing bars are placed along foundation ditch direction is symmetrical, between two reinforcing bars, every 3m, with transverse reinforcement, fix, reinforcing cage upper end reserves 40cm to be connected with reinforcing bar in hat beam, and two its distances of vertical reinforcement are 0.9d, its main purpose is that reinforcing bar is around surrounded by rubble, bring into play again the anti-bending strength of reinforcing bar as far as possible, meanwhile, diameter is about to 30mm common plastics tube and ties up at reinforcing cage bottom simultaneously.
In step a, 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 step e, grouting pressure is controlled at 0.4MPa.
In step f, when seepage resistance demand is higher, adopt many row's cement mixing methods 3.
Row's spacing between mini stake 2 is 4 times of diameter D of cement mixing method 3, and the row's spacing between cement mixing method 3 and front campshed 21 is 0.7 times of diameter D of cement mixing method 3.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (5)
1. the mini Zhuan Dang of row more than fortifield village protection structure construction technology, is characterized in that: comprise the following steps:
A, at foundation ditch, around 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, by minor diameter hollow drill bit, hole, in the time of boring, adopt the mode of mud off to protect a hole, different rows' mini stake (2) stake position is interlaced arrangement, and the diameter d of mini stake (2) is 20cm-40cm;
C, the reinforcing bar fixing is put into a hole after having holed, adopt two vertical reinforcements (23) to place along foundation ditch direction is symmetrical, two vertical reinforcements (23) are longitudinally fixing every transverse reinforcement for 2-3m (24), reinforcing cage upper end reserves 20-40cm to be connected with reinforcing bar in Guan Liang (1), the spacing of two vertical reinforcements (23) is 0.6-0.9 times of mini stake diameter d, meanwhile, the plastic pipe that is 20-30mm by diameter is tied up at reinforcing cage bottom;
D, with grouting device, by plastic pipe, in stake hole, inject clear water, when top, stake hole, returning out concentration of slurry is 1.00g/cm
3-1.05g/cm
3time, stopping injecting clear water, and in stake hole, pour into rubble immediately, rubble diameter is 1cm-3cm;
E, when rubble is filled to design height, by prepositioned plastic pipe, slip casting is carried out to behind clear hole again in stake hole, the water/binder ratio of cement paste is 0.3-0.5:1, stops slip casting when top, stake hole has cement paste to emerge;
It is 40-60cm stake type that f, cement mixing method (3) adopt diameter D, and cement mixing method (3) position is near front campshed (21) one sides;
G, after finishing, mini stake and cement mixing pile driving construction carry out the construction of Guan Liang (1), first mini stake (2) upper reinforcement vertical reinforcement (23) and the hat beam stirrup (11) of Guan Liang (1) inside are welded, after having welded, carry out concrete building and maintenance.
2. the mini Zhuan Dang of many rows according to claim 1 fortifield village protection structure construction technology, 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.
3. the mini Zhuan Dang of many rows according to claim 1 fortifield village protects construction technology, it is characterized in that: in described step e, grouting pressure is controlled at 0.3-0.5MPa.
4. the mini Zhuan Dang of many rows according to claim 1 fortifield village protection structure construction technology, is characterized in that: in described step f, when soil property is poor or sealing is had relatively high expectations, adopt many row's cement mixing methods (3).
5. the mini Zhuan Dang of many rows according to claim 2 fortifield village protection structure construction technology, it is characterized in that: the row's distance between described mini stake (2) be cement mixing method (3) diameter D 2-5 doubly, the distance between cement mixing method (3) and front campshed (21) is 0.6-0.8 times of diameter D of cement mixing method (3).
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| CN201210069475.7A CN102605792B (en) | 2012-03-16 | 2012-03-16 | Multi-row mini-pile enclosing structure for blocking soil and construction process |
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| CN102605792B true CN102605792B (en) | 2014-04-02 |
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| CN103074897A (en) * | 2013-01-18 | 2013-05-01 | 卫海 | Reinforced restraint earth compound supporting structure and construction method thereof |
| CN103074898B (en) * | 2013-01-18 | 2015-09-23 | 江苏鸿基科技有限公司 | Multi-row pile foundation pit support structure and construction method thereof |
| CN103452120B (en) * | 2013-08-26 | 2015-12-23 | 中冶集团武汉勘察研究院有限公司 | A kind of stake apical cap girder construction of the high-strength Prestressed Pipe Pile for pattern foundation pit supporting structure and construction method thereof |
| CN103758132B (en) * | 2014-01-08 | 2016-03-02 | 湖北中南勘察基础工程有限公司 | The construction technology of the cantilever soldier pile retaining structure on slope is put in a kind of combination |
| CN103898916B (en) * | 2014-04-09 | 2016-01-20 | 浙江理工大学 | Mini stake Composite Braced Retaining Structure and construction method |
| CN105317046A (en) * | 2014-06-13 | 2016-02-10 | 温州荣强海洋科技有限公司 | Deformed bar concrete and cemented soil distributed type foundation pit supporting wall |
| CN105544560B (en) * | 2016-02-03 | 2017-07-21 | 华侨大学 | It is a kind of to be used for the beam type connecting node of special-shaped double-row pile |
| CN107034913A (en) * | 2017-05-23 | 2017-08-11 | 梁美欣 | Retaining wall structure |
| CN108914927A (en) * | 2018-07-30 | 2018-11-30 | 中铁二十三局集团有限公司 | The miniature steel pipe pile reinforced construction method of existing line base insuring highway' slope |
| CN109577344B (en) * | 2018-11-29 | 2022-01-07 | 浙江理工大学 | Foundation pit supporting method of vertical variable-rigidity supporting body |
| CN112779853A (en) * | 2019-11-07 | 2021-05-11 | 中冶京诚工程技术有限公司 | Abutment and design and construction method thereof |
| CN112627188B (en) * | 2020-12-04 | 2022-12-06 | 广东珠江工程总承包有限公司 | Deep foundation pit supporting structure and construction method thereof |
| CN113718797A (en) * | 2021-10-07 | 2021-11-30 | 南通大学 | Double-row pile and multilayer composite three-dimensional fabric waterproof curtain integrated foundation pit supporting structure and construction method thereof |
| CN114541414A (en) * | 2022-03-03 | 2022-05-27 | 深圳市工勘岩土集团有限公司 | Underground pipe culvert foundation pit reverse construction method excavation support construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3012894B2 (en) * | 1995-08-02 | 2000-02-28 | 鹿島建設株式会社 | Simple underground construction method |
| CN2587934Y (en) * | 2002-12-25 | 2003-11-26 | 国家电力公司华东勘测设计研究院 | Composite pile member for composite foundation |
| KR20050012873A (en) * | 2005-01-12 | 2005-02-02 | 성호건설산업주식회사 | Method of constructing cantilevered continuous walls for retaining earth and cutting off water ang method of constructing wall structures while performing soil improvement at the same time.(C.R.C.W.: Cantilevered retaining cutting wall) |
| CN101560770B (en) * | 2008-04-15 | 2011-05-25 | 广东省六建集团有限公司 | Novel deep building foundation pit supporting system |
| CN101418570A (en) * | 2008-11-28 | 2009-04-29 | 天津大学 | Foundation pit supporting method with double rows of piles |
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Application publication date: 20120725 Assignee: GEOTECHNICAL TECHNOLOGY Co.,Ltd. Assignor: Zhejiang Sci-Tech University Contract record no.: 2017330000145 Denomination of invention: Multi-row mini-pile enclosing structure for blocking soil and construction process Granted publication date: 20140402 License type: Common License Record date: 20171225 |
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