CN102605792A - 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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- CN102605792A CN102605792A CN2012100694757A CN201210069475A CN102605792A CN 102605792 A CN102605792 A CN 102605792A CN 2012100694757 A CN2012100694757 A CN 2012100694757A CN 201210069475 A CN201210069475 A CN 201210069475A CN 102605792 A CN102605792 A CN 102605792A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000010276 construction Methods 0.000 title claims abstract description 39
- 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 61
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 230000002787 reinforcement Effects 0.000 claims description 75
- 230000003014 reinforcing effect Effects 0.000 claims description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 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
- 238000013019 agitation Methods 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 8
- 210000003205 muscle Anatomy 0.000 claims description 6
- 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
- 238000003466 welding Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 21
- 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 9
- 238000009412 basement excavation Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- -1 if do not overlap Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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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 the foundation field, relate in particular to mini stake retaining fortifield village's protection structure of many rows and construction technology.
Background technology
In order to reduce the influence of excavation of foundation pit to surrounding environment, at present, fender post is widely used in the bracing of foundation pit; For single stake; Because its anti-bending strength is relatively poor, therefore, be difficult to the displacement of stake top is effectively controlled; In order to reduce the influence of excavation of foundation pit to surrounding environment as much as possible, the double-row pile with higher anti-bending strength is widely used.Traditional double-row pile mainly is to adopt bored pile and preformed pile; Yet; In view of the nervous situation of present land used, the construction plant condition also becomes an essential condition that influences the fender post type, and therefore the construction for bored pile and preformed pile has had bigger challenge.And for the construction of mini stake, because its used rig is geological prospecting rig or jumbolter, it is less to take up room, and constructs when therefore mini stake can be restricted on construction ground.Simultaneously, the mini stake of the type is owing to adopt the job practices 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, thus make mini stake utilization more economically.For mini stake, because its footpath is less and need place reinforcing bar in advance, difficulty of construction is higher and construction cost is higher when adopting tremie to pour into.The construction technology of the mini stake of tradition is to adopt one or more high-performance reinforcing bar to be positioned over drill center and slip casting around reinforcing bar; Because the stressed of this mini stake mainly born by the high-performance reinforcing bar; And its bending rigidity is less when reinforcing bar is in the center, therefore adopts the stake type with higher bending rigidity for the bracing of foundation pit requirement of engineering.
Summary of the invention
The present invention is directed in the existing bracing of foundation pit technology owing to construction plant around the foundation ditch is limited; The construction of tradition fender post can't launch; And shortcoming such as common mini stake bending rigidity is little; Provide two reinforcing bars of a kind of employing along placing, given full play to the anti-bending strength of reinforcing bar, thereby improved the bending rigidity of the mini stake of the type perpendicular to the foundation pit walls direction; When adopting multiline pile, given full play to the overall performance and the three-dimensional effect of combining structure, simultaneously, the mini stake of the type can be through controlling the stress performance of mini stake to factors such as bar diameter, type and slip casting concentration.
In order to solve the problems of the technologies described above, the present invention is able to solve through following technical proposals:
The mini stake retaining of many rows fortifield village protection structure comprises the mini stake that Guan Liang and two rows are above, and campshed and back campshed before described mini stake comprises are provided with cement mixing method between preceding campshed and the back campshed, and the top of mini stake links together through Guan Liang.
As preferably, be provided with the vertical muscle of hat beam stirrup and Guan Liang in the described hat beam, the hat beam stirrup is connected with the interior vertical reinforcement that is provided with of mini stake.
As preferably, be provided with two along the foundation ditch direction in the described mini stake, the vertical reinforcement of symmetric arrangement, the distance between the vertical reinforcement is 0.6-0.9d, d is mini stake stake footpath; Between two vertical reinforcements vertically at interval 2-4 m fix vertical reinforcement and transverse reinforcement composition reinforcing cage with transverse reinforcement.
As preferably, described cement mixing method is arranged on the side near preceding campshed, and the stake position is interspersed or is the plum blossom shape and distributes between preceding campshed and the back campshed.
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 stake retaining of many rows fortifield village protects construction technology, may further comprise the steps:
A, excavate groove around the foundation ditch, cutting depth is more than or equal to the design height of Guan Liang;
The pile crown location is carried out in b, position, selected stake position, selects geology exploratory drilling rig or jumbolter; Hole through the minor diameter hollow drill bit; Adopt the mode of mud off to protect a hole in the time of boring, different rows' mini stake stake position interleaved arranges that the diameter d of mini stake is 20cm-40cm;
C, boring are put into a hole with the reinforcing bar that fixes after accomplishing; Adopt two vertical reinforcements to place along foundation ditch direction symmetry; Two vertical reinforcements are longitudinally whenever fixed with transverse steel at a distance from 2-3m; Steel reinforcement cage upper end reserve 20-40cm in case with the hat beam in reinforcing bar be connected; The spacing of two vertical reinforcements is 0.6-0.9 a times of mini stake diameter d; Simultaneously, be that the plastic tube of 20-30mm is tied up at steel reinforcement cage bottom with diameter; Steel reinforcement cage upper end reserve 20-40cm in case with the hat beam in reinforcing bar be connected, the 0.6-0.9 that two its distances of vertical reinforcement be mini stake diameter d doubly, its main purpose is to make to be surrounded by rubble around the reinforcing bar that the while is brought into play the anti-bending strength of reinforcing bar again as far as possible.
D, in the stake hole, inject clear water through plastic pipe with grouting device, returning out concentration of slurry when top, stake hole is 1.00g/cm
3-1.05 g/cm
3The time, stopping to inject clear water, and in the stake hole, pour into rubble immediately, the rubble diameter is 1cm-3cm;
E, when rubble is filled to design height, carry out slip casting through prepositioned plastic pipe after to clear once more hole, stake hole, the water/binder ratio of cement paste is 0.3-0.5:1, when top, stake hole has cement paste to emerge, stops slip casting;
It is 40-60cm stake type that f, cement mixing method adopt diameter D, and the cement mixing method position is near preceding campshed one side; When relatively poor or sealing is had relatively high expectations when soil property, can adopt many drainings earth agitation pile.
G, after mini stake and cement mixing pile construction finish, carry out the construction of Guan Liang, earlier mini stake upper reinforcement vertical reinforcement and the inner transverse reinforcement of hat beam are welded, welding is carried out concrete building and maintenance after accomplishing.The hat depth of beam is 30-50cm, and the width of Guan Liang perhaps exceeds the edge 20-30cm of stake for to flush with the edge of stake, and reinforcement placement is double-deck elongated layout in the hat beam.Generally to consider the interaction forces between two mini stakes for the design of Guan Liang, confirm the configuration of hat beam inside reinforcing bar through calculating interaction force between two campsheds.
Among the step b; Geological prospecting rig or jumbolter are adopted in construction for mini stake, can around the limited foundation ditch of site condition, construct, and on position, stake position, carry out the pile crown location according to design; Hole through the minor diameter hollow drill bit; Boring simultaneously adopts the mode of mud off to protect a hole, and the mud off method for using is similar with the retaining wall mode of traditional bored pile, adopts quincuncial arrangement between adjacent mini; Campshed is interspersed between the campshed with the back promptly, the line formation triangle behind preceding campshed and its immediate two between the campshed.Make its diameter of the mini stake of bracing of foundation pit for the type and generally get 20cm-40cm.Among the step c; Boring after accomplishing is put into the reinforcing bar that fixes to projected depth; Two reinforcing bars are placed along foundation ditch direction symmetry; Whenever fix with transverse steel at a distance from 2-3m between two reinforcing bars, steel reinforcement cage upper end reserve 30-40cm in case with the hat beam in reinforcing bar be connected, two its distances of vertical reinforcement are 0.6-0.9d; Its main purpose is to make reinforcing bar surrounded by rubble on every side; Bring into play simultaneously the anti-bending strength of reinforcing bar again as far as possible, simultaneously, diameter is about the 20-30mm common plastics tube ties up bottom at steel reinforcement cage.
As preferably, among the described step a, to be preced with back portion and to be located at below the face of land, the above soil body of hat beam adopts the part to put the domatic formula.
As preferably, among the described step e, grouting pressure is controlled at 0.3-0.5MPa.
As preferably, among the described step f, when impervious having relatively high expectations, adopt many drainings earth agitation pile.
As preferably, the row's spacing between the described mini stake be cement mixing method diameter D 2-5 doubly, the row's spacing between cement mixing method and the preceding campshed is 0.6-0.8 times of diameter D of cement mixing method.
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 the lateral deformation of foundation ditch and the surface settlement around the foundation ditch.Simultaneously, the required construction machinery of the type stake is less, and is low to the work plane dimensional requirement, therefore can a plurality of working face construct simultaneously and work progress comparatively simple, can save the engineering time better and reduce construction costs.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1.
Fig. 2 is A among Fig. 1-A face sectional view.
Fig. 3 is the structural representation of the embodiment of the invention 2.
Fig. 4 is B among Fig. 3-B face sectional view.
Wherein 1-Guan Liang, 2-mini stake, 3-cement mixing method, 4-soil, 11-hat beam stirrup, the vertical muscle, 21 of 12-Guan Liang-preceding campshed, 22-back campshed, 23-vertical reinforcement, 24-transverse reinforcement.
The specific embodiment
Below in conjunction with accompanying drawing 1 to the accompanying drawing 2 and the specific embodiment the present invention is described in further detail:
Embodiment 1
The mini stake retaining of many rows fortifield village protection structure; To shown in Figure 2, comprise the mini stake 2 that hat beam 1 and two rows are above like Fig. 1, campshed 21 and back campshed 22 before described mini stake 2 comprises; Be provided with cement mixing method 3 between preceding campshed 21 and the back campshed 22, the top of mini stake 2 links together through hat beam 1.Multiline pile connects with hat beam 3 and forms unified integral body, campshed 21 back campshed 22 is delivered to the part lateral earth pressure through hat beam 3 and inter-pile soil before, and passive area provides lateral pressure; Simultaneously, preceding campshed 21 bears pressure, and back campshed 22 bears pulling force, produces certain bending moment, finally makes this space enclosing structure have higher resistance to capsizing.
Be provided with the vertical muscle 12 of hat beam stirrup 11 and Guan Liang in the hat beam 1, hat beam stirrup 11 is connected with the vertical reinforcement 23 of setting in the mini stake 2.Hat beam inside is put into main muscle along the foundation pit walls direction and promptly is preced with beam stirrup 11, is preced with beam stirrup 11 symmetric arrangement, mainly bears the moment of flexure of horizontal direction, and is as shown in Figure 1; And mini stake 2 top vertical reinforcements 23 are connected with it, put into the vertical muscle of the Guan Liang parallel in the hat beam 3 simultaneously with the foundation pit walls direction, quantity of reinforcement should require and the rigidity of mini stake and Guan Liang is coordinated comprehensively definite according to the bending resistance of hat beam.
Be provided with two along the foundation ditch direction in the mini stake 2, the vertical reinforcement 23 of symmetric arrangement, the distance between the vertical reinforcement 23 is 0.6-0.9d, d is mini stake stake footpath; Vertically 2-4 m is fixing with transverse reinforcement 24 at interval between two vertical reinforcements 23, and vertical reinforcement 23 is formed 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.Infiltrate foundation ditch because cement mixing method 3 can be resisted underground water, if do not overlap, water can flow into foundation ditch the slit between agitation pile; Therefore; Through cement mixing pile 3 is overlapped, form the water-stop curtain of one complete closed formula, can resist underground water effectively and infiltrate foundation ditch.
The mini stake retaining of many rows fortifield village protects construction technology, may further comprise the steps:
A, excavate groove around the foundation ditch, cutting depth is more than or equal to the design height of hat beam 1;
The pile crown location is carried out in b, position, selected stake position, selects geology exploratory drilling rig or jumbolter; Hole through the minor diameter hollow drill bit; Adopt the mode of mud off to protect a hole in the time of boring, 2 position interleaved of mini stake of different rows arrange that the diameter d of mini stake 2 is 25cm; Boring adopts the mode of mud off to protect a hole simultaneously; Control concentration of hydraulic mixture through the hollow drill bit water filling during boring; The retaining wall mode of mud off mode of occupation and traditional bored pile is similar; Be to intersect between adjacent two rows' the mini stake 2 and arrange, three adjacent mini stakes are quincuncial arrangement.
C, boring are put into a hole with the reinforcing bar that fixes after accomplishing; Adopt two vertical reinforcements 23 to place along foundation ditch direction symmetry; Two vertical reinforcements 23 are longitudinally whenever fixing with transverse steel 24 at a distance from 2m; Steel reinforcement cage upper end reserve 20cm in case with hat beam 1 in reinforcing bar be connected; The spacing of two vertical reinforcements 23 is 0.7 times of mini stake diameter d; Simultaneously, be that the plastic tube of 20mm is tied up at steel reinforcement cage bottom with diameter; Steel reinforcement cage upper end reserve 20cm in case with hat beam 1 in reinforcing bar be connected, two its distances of vertical reinforcement be 0.7 times of mini stake diameter d, its main purpose is to make to be surrounded by rubble around the reinforcing bar that the while is brought into play the anti-bending strength of reinforcing bar again as far as possible.
D, in the stake hole, inject clear water through plastic pipe with grouting device, returning out concentration of slurry when top, stake hole is 1.00g/cm
3The time, stopping to inject clear water, and in the stake hole, pour into rubble immediately, the rubble diameter is 2cm;
E, when rubble is filled to design height, carry out slip casting through prepositioned plastic pipe after to clear once more hole, stake hole, the water/binder ratio of cement paste is 0.3:1, when top, stake hole has cement paste to emerge, stops slip casting; When rubble is filled to design height, through prepositioned plastic pipe slip casting is carried out behind the hole clearly once more in the stake hole, the water/binder ratio of cement paste is 0.3:1, when top, stake hole has cement paste to emerge, stops slip casting; Can dispose different water for the different strata condition, when infiltration condition is better, should reduce water/binder ratio, grouting pressure generally is controlled 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 preceding campshed 21 1 sides; Cement mixing method diameter and pile spacing require to design according to antiseepage; The cement mixing method position is near preceding campshed one side; When relatively poor or sealing is had relatively high expectations when soil property; When mini stake 2 is many rows, can adopt many drainings earth agitation pile 3, many drainings earth agitation pile is set to reach better anti-seepage effect.
G, after mini stake and cement mixing pile construction finish, be preced with the construction of beam 1, earlier mini stake 2 upper reinforcement vertical reinforcements 23 and hat beam 1 inner transverse reinforcement 11 welded, welding is carried out concrete building and maintenance after accomplishing.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 reinforcement placement is double-deck elongated layout in the hat beam 1, and reinforcing bar mainly bears level to bending resistance, and the reinforcement placement plan view is as shown in Figure 1.Generally to consider the interaction forces between two mini stakes for the design of Guan Liang, confirm the configuration of hat beam inside reinforcing bar through calculating interaction force between two campsheds.The main effect of Guan Liang is to connect into unified whole with arranging mini stake more; Behind the excavation of foundation pit, lateral deformation takes place after bearing lateral earth pressure in back campshed, and back campshed is transferred to preceding campshed through Guan Liang and inter-pile soil with the part lateral earth pressure; Bear lateral earth pressure jointly by the front and back campshed; And back campshed bears pulling force, and front-seat pile is stressed, thereby has improved the resistance to capsizing of stake.Generally to consider the interaction forces between two mini stakes for the design of Guan Liang, confirm the configuration of hat beam inside reinforcing bar through calculating interaction force between two campsheds.
Among the step b; Geological prospecting rig or jumbolter are adopted in construction for mini stake, can around the limited foundation ditch of site condition, construct, and on position, stake position, carry out the pile crown location according to design; Hole through the minor diameter hollow drill bit; Boring simultaneously adopts the mode of mud off to protect a hole, and the mud off method for using is similar with the retaining wall mode of traditional bored pile, adopts quincuncial arrangement between adjacent mini 2; Campshed is interspersed between the campshed with the back promptly, the line formation triangle behind preceding campshed 21 and its immediate two between the campshed 22.Among the step a, hat beam 1 top is located at below the face of land, and the hat beam 1 above soil body adopts the part to put the domatic formula.
Among the step e, grouting pressure is controlled at 0.3MPa.
Among the step f, when impervious having relatively high expectations, adopt many drainings earth agitation pile 3.
Row's spacing between the mini stake 2 be cement mixing method 3 diameter D 2-5 doubly, the row's spacing between cement mixing method 3 and the preceding campshed 21 is 0.6-0.8 times of diameter D of cement mixing method 3.The method of pile body reinforcing bar+rubble+slip casting is adopted in mini stake among the present invention; Use this pile-formation process to control the bending rigidity of pile body through changing bar diameter; Than the minor-diameter steel-tube stake; The connection between stake and the hat beam is carried out in the mini stake of the type more easily, and simultaneously for identical pile body bending rigidity, the mini stake of the type more economically.The performance mechanism of this multiline pile combining structure is, the inboard passive area of foundation ditch provides lateral pressure, and preceding campshed is stressed to be pressure, and back campshed is stressed to be pulling force, under three kinds of power effects, makes this combining structure that better resistance to capsizing arranged.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 perpendicular to foundation pit walls direction symmetric arrangement, given full play to the anti-bending strength of reinforcing bar, saved amount of reinforcement and made simple.
See Fig. 3,4, present embodiment and embodiment 1 difference are that mini stake 2 is three rows, and cement mixing method 3 is two rows; When the mini stake of first row 2 as preceding campshed 21 constantly, the mini stake 2 of second row is as back campsheds 22; When the mini stake of second row 2 during as preceding campshed 21, the mini stake 2 of the 3rd row be after campshed 22.When relatively poor or sealing is had relatively high expectations when soil property, adopt the mini stake 2 of many rows, and many drainings earth agitation pile 3, can reach better anti-seepage effect.
The mini stake retaining of many rows fortifield village protects construction technology, may further comprise the steps:
A, excavate groove around the foundation ditch, cutting depth is more than or equal to the design height of hat beam 1;
The pile crown location is carried out in b, position, selected stake position, selects geology exploratory drilling rig or jumbolter; Hole through the minor diameter hollow drill bit; Adopt the mode of mud off to protect a hole in the time of boring, 2 position interleaved of mini stake of different rows arrange that the diameter d of mini stake 2 is 40cm; Boring adopts the mode of mud off to protect a hole simultaneously; Control concentration of hydraulic mixture through the hollow drill bit water filling during boring; The retaining wall mode of mud off mode of occupation and traditional bored pile is similar; Be to intersect between adjacent two rows' the mini stake 2 and arrange, three adjacent mini stakes are quincuncial arrangement.
C, boring are put into a hole with the reinforcing bar that fixes after accomplishing; Adopt two vertical reinforcements 23 to place along foundation ditch direction symmetry; Two vertical reinforcements 23 are longitudinally whenever fixing with transverse steel 24 at a distance from 3m; Steel reinforcement cage upper end reserve 30cm in case with hat beam 1 in reinforcing bar be connected; The spacing of two vertical reinforcements 23 is 0.8 times of mini stake diameter d; Simultaneously, be that the plastic tube of 30mm is tied up at steel reinforcement cage bottom with diameter; Steel reinforcement cage upper end reserve 30cm in case with hat beam 1 in reinforcing bar be connected, two its distances of vertical reinforcement be 0.8 times of mini stake diameter d, its main purpose is to make to be surrounded by rubble around the reinforcing bar that the while is brought into play the anti-bending strength of reinforcing bar again as far as possible.
D, in the stake hole, inject clear water through plastic pipe with grouting device, returning out concentration of slurry when top, stake hole is 1.03 g/cm
3The time, stopping to inject clear water, and in the stake hole, pour into rubble immediately, the rubble diameter is 3cm;
E, when rubble is filled to design height, carry out slip casting through prepositioned plastic pipe after to clear once more hole, stake hole, the water/binder ratio of cement paste is 0.4:1, when top, stake hole has cement paste to emerge, stops slip casting; When rubble is filled to design height, through prepositioned plastic pipe slip casting is carried out behind the hole clearly once more in the stake hole, the water/binder ratio of cement paste is 0.4:1, when top, stake hole has cement paste to emerge, stops slip casting; Can dispose different water for the different strata condition, when infiltration condition is better, should reduce water/binder ratio, grouting pressure generally is controlled 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 preceding campshed 21 1 sides; Cement mixing method diameter and pile spacing require to design according to antiseepage; The cement mixing method position is near preceding campshed one side; When relatively poor or sealing is had relatively high expectations when soil property; When mini stake 2 is many rows, can adopt many drainings earth agitation pile 3, many drainings earth agitation pile is set to reach better anti-seepage effect.
G, after mini stake and cement mixing pile construction finish, be preced with the construction of beam 1, earlier mini stake 2 upper reinforcement vertical reinforcements 23 and hat beam 1 inner transverse reinforcement 11 welded, welding is carried out concrete building and maintenance after accomplishing.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, and is stressed favourable to the node of stake top/Guan Liang junction, be not easy to occur the destruction of this local location.If 2 edges of hat beam 1 and mini stake flush setting, occur the destruction of this local location more easily, thereby have influence on whole intensity of keeping off fortifield village's protection structure.Reinforcement placement is double-deck elongated layout in the hat beam 1, and reinforcing bar mainly bears level to bending resistance, and the reinforcement placement plan view is as shown in Figure 1.Generally to consider the interaction forces between two mini stakes for the design of Guan Liang, confirm the configuration of hat beam inside reinforcing bar through calculating interaction force between two campsheds.The main effect of Guan Liang is to connect into unified whole with arranging mini stake more; Behind the excavation of foundation pit, lateral deformation takes place after bearing lateral earth pressure in back campshed, and back campshed is transferred to preceding campshed through Guan Liang and inter-pile soil with the part lateral earth pressure; Bear lateral earth pressure jointly by the front and back campshed; And back campshed bears pulling force, and front-seat pile is stressed, thereby has improved the resistance to capsizing of stake.Generally to consider the interaction forces between two mini stakes for the design of Guan Liang, confirm the configuration of hat beam inside reinforcing bar through calculating interaction force between two campsheds.
Among the step b; Geological prospecting rig or jumbolter are adopted in construction for mini stake, can around the limited foundation ditch of site condition, construct, and on position, stake position, carry out the pile crown location according to design; Hole through the minor diameter hollow drill bit; Boring simultaneously adopts the mode of mud off to protect a hole, and the mud off method for using is similar with the retaining wall mode of traditional bored pile, adopts quincuncial arrangement between adjacent mini 2; Campshed is interspersed between the campshed with the back promptly, the line formation triangle behind preceding campshed 21 and its immediate two between the campshed 22.Make its diameter of the mini stake of bracing of foundation pit for the type and generally get 40cm.
Among the step c; Boring after accomplishing is put into the reinforcing bar that fixes to projected depth; Two reinforcing bars are placed along foundation ditch direction symmetry; Whenever fix with transverse steel at a distance from 3m between two reinforcing bars, steel reinforcement cage upper end reserve 40cm in case with the hat beam in reinforcing bar be connected, two its distances of vertical reinforcement are 0.9d; Its main purpose is to make reinforcing bar surrounded by rubble on every side; Bring into play simultaneously the anti-bending strength of reinforcing bar again as far as possible, simultaneously, diameter is about the 30mm common plastics tube ties up bottom at steel reinforcement cage.
Among the step a, hat beam 1 top is located at below the face of land, and the hat beam 1 above soil body adopts the part to put the domatic formula.
Among the step e, grouting pressure is controlled at 0.4MPa.
Among the step f, when impervious having relatively high expectations, adopt many drainings earth agitation pile 3.
Row's spacing between the 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 the preceding campshed 21 is 0.7 times of diameter D of cement mixing method 3.
In a word, the above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (10)
1. arrange mini stake more and keep off fortifield village's protection structure; Comprise Guan Liang (1) and the above mini stake (2) of two rows; It is characterized in that: described mini stake (2) comprises preceding campshed (21) and back campshed (22); Be provided with cement mixing method (3) between preceding campshed (21) and the back campshed (22), the top of mini stake (2) links together through Guan Liang (1).
2. the mini stake retaining of many rows according to claim 1 fortifield village protection structure; It is characterized in that: be provided with the vertical muscle (12) of hat beam stirrup (11) and Guan Liang in the described Guan Liang (1), hat beam stirrup (11) is connected with the vertical reinforcement (23) of setting in the mini stake (2).
3. the mini stake retaining of many rows according to claim 1 fortifield village protection structure; It is characterized in that: be provided with two along the foundation ditch direction in the described mini stake (2); The vertical reinforcement of symmetric arrangement (23), the distance between the vertical reinforcement (23) is 0.6-0.9d, d is mini stake stake footpath; Vertically 2-4 m is fixing with transverse reinforcement (24) at interval between two vertical reinforcements (23), and vertical reinforcement (23) is formed reinforcing cage with transverse reinforcement (24).
4. the mini stake retaining of many rows according to claim 1 fortifield village protection structure; It is characterized in that: described cement mixing method (3) is arranged on the side near preceding campshed (21), and the stake position is interspersed or is the plum blossom shape and distributes between preceding campshed (21) and the back campshed (22).
5. the mini stake retaining of many rows according to claim 1 fortifield village protection structure, it is characterized in that: 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.
6. arrange mini stake more and keep off fortifield village's protection structure construction technology, it is characterized in that: may further comprise the steps:
A, excavate groove around the foundation ditch, cutting depth is more than or equal to the design height of Guan Liang (1);
B, position, selected stake position; Carry out the pile crown location; Select geology exploratory drilling rig or jumbolter; Hole by the minor diameter hollow drill bit; Adopt the mode of mud off to protect a hole in the time of boring; Different rows' mini stake (2) stake position interleaved arranges that the diameter d of mini stake (2) is 20cm-40cm;
C, boring are put into a hole with the reinforcing bar that fixes after accomplishing; Adopt two vertical reinforcements (23) to place along foundation ditch direction symmetry; Two vertical reinforcements (23) are longitudinally whenever fixing with transverse steel (24) at a distance from 2-3m; The steel reinforcement cage upper end reserves 20-40cm so that be connected with the middle reinforcing bar of Guan Liang (1); The spacing of two vertical reinforcements (23) is 0.6-0.9 a times of mini stake diameter d; Simultaneously, be that the plastic tube of 20-30mm is tied up at steel reinforcement cage bottom with diameter;
D, in the stake hole, inject clear water through plastic pipe with grouting device, returning out concentration of slurry when top, stake hole is 1.00g/cm
3-1.05 g/cm
3The time, stopping to inject clear water, and in the stake hole, pour into rubble immediately, the rubble diameter is 1cm-3cm;
E, when rubble is filled to design height, carry out slip casting through prepositioned plastic pipe after to clear once more hole, stake hole, the water/binder ratio of cement paste is 0.3-0.5:1, when top, stake hole has cement paste to emerge, stops slip casting;
It is 40-60cm stake type that f, cement mixing method (3) adopt diameter D, and cement mixing method (3) position is near preceding campshed (21) one sides;
G,, mini stake and cement mixing pile construction carry out the construction of Guan Liang (1) after finishing; Earlier mini stake (2) upper reinforcement vertical reinforcement (23) and the inner transverse reinforcement (11) of Guan Liang (1) are welded, welding is carried out concrete building and maintenance after accomplishing.
7. the mini stake retaining of many rows according to claim 6 fortifield village protection structure construction technology, it is characterized in that: among the described step a, Guan Liang (1) top is located at below the face of land, and the above soil body of Guan Liang (1) adopts the part to put the domatic formula.
8. the mini stake retaining of many rows according to claim 6 fortifield village protects construction technology, and it is characterized in that: among the described step e, grouting pressure is controlled at 0.3-0.5MPa.
9. the mini stake retaining of many rows according to claim 6 fortifield village protection structure construction technology is characterized in that: among the described step f, when relatively poor or sealing is had relatively high expectations when soil property, adopt many drainings earth agitation pile (3).
10. the mini stake retaining of many rows according to claim 7 fortifield village protection structure construction technology; It is characterized in that: the row's distance between the described mini stake (2) be cement mixing method (3) diameter D 2-5 doubly, the distance between cement mixing method (3) and the preceding 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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| 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 |
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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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