CN111962520A - Combined supporting structure of inclined bamboo joint piles and vertical pipe piles and construction method thereof - Google Patents
Combined supporting structure of inclined bamboo joint piles and vertical pipe piles and construction method thereof Download PDFInfo
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- 241001330002 Bambuseae Species 0.000 title claims abstract description 185
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- 238000009412 basement excavation Methods 0.000 claims abstract description 13
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- 238000003756 stirring Methods 0.000 claims description 37
- 239000004568 cement Substances 0.000 claims description 31
- 239000004567 concrete Substances 0.000 claims description 29
- 239000002689 soil Substances 0.000 claims description 28
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- 229910000831 Steel Inorganic materials 0.000 claims description 16
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- 229910001294 Reinforcing steel Inorganic materials 0.000 description 8
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- 239000004593 Epoxy Substances 0.000 description 1
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- 239000004570 mortar (masonry) Substances 0.000 description 1
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Abstract
The invention discloses a combined supporting structure of inclined bamboo joint piles and vertical tubular piles, which comprises a row pile supporting structure formed by alternately arranging tubular piles and bamboo joint piles; the tubular pile and the bamboo joint pile are arranged along the inner side of the edge of the foundation pit, and the pile tops of the tubular pile and the bamboo joint pile are provided with crown beams; the axis of the bamboo joint pile is inclined to the horizontal plane, the lower part of the bamboo joint pile is inclined to the interior of the foundation pit, a plurality of annular bulges vertical to the axis of the bamboo joint pile are arranged on the outer surface of the pile body of the bamboo joint pile, and annular reinforcing ribs are arranged in the annular bulges; the axis of the tubular pile is vertical to the horizontal plane; the pile top center connecting line of the tubular pile is parallel to or coincided with the pile top center connecting line of the bamboo joint pile. The invention also discloses a construction method of the combined supporting structure of the inclined bamboo joint pile and the vertical pipe pile. The invention can reduce the displacement of the pile top, increase the excavation depth, reduce the possibility of foundation pit overturning damage, and reduce the design strength of the support pile so as to reduce the manufacturing cost.
Description
Technical Field
The invention relates to a foundation pit supporting structure and a construction method, in particular to a combined supporting structure of an inclined bamboo joint pile and a vertical pipe pile and a construction method of the combined supporting structure.
Background
At present, with the advance of the national urbanization process, underground large-area and large-length foundation pits account for more than 80 percent of the total area of the foundation pits in China. But the traditional support mode has great defects and shortcomings: 1. the cantilever foundation pit supporting structure can only be applied to foundation pit engineering with shallow excavation depth and good soil condition; 2. for the inner support supporting structure, although the inner support supporting structure can be applied to a deep foundation pit, the construction is complex, the construction period is long, the environmental pollution is serious, and the construction cost is high. Therefore, the inclined pile supporting structure comes into play, inclined supporting piles are formed by inclining the vertical cantilever supporting piles to a certain angle in the foundation pit, and the inclined supporting piles and the vertical supporting piles are arranged alternately, so that the inclined-straight alternate supporting structure can be formed. Traditional oblique straight alternative fender pile all adopts the tubular pile, in soft soil foundation engineering, the tubular pile atress form is friction foundation pile mostly, and the concrete intensity (C60-C100) of tubular pile body is very high, but the specific surface area (the ratio of unit concrete volume and pile body external surface area) of pile body is less, consequently the effort between tubular pile body outward appearance and soil is less than pile body intensity far away, pile body structural strength can not obtain abundant performance, the very big waste of concrete pipe pile bearing capacity has been caused, unable full play supporting construction's pile body frictional force. The whole supporting capability of the supporting structure is mainly exerted by the tension given by the straight pile to the inclined pile, and the traditional tubular pile cannot fully exert the tension.
Disclosure of Invention
The invention provides a combined supporting structure of an inclined bamboo joint pile and a vertical pipe pile and a construction method thereof, aiming at solving the technical problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a combined supporting structure of inclined bamboo joint piles and vertical tubular piles comprises a row pile supporting structure formed by alternately arranging tubular piles and bamboo joint piles; the tubular pile and the bamboo joint pile are arranged along the inner side of the edge of the foundation pit, and the pile tops of the tubular pile and the bamboo joint pile are provided with crown beams; the axis of the bamboo joint pile is inclined to the horizontal plane, the lower part of the bamboo joint pile is inclined to the interior of the foundation pit, a plurality of annular bulges vertical to the axis of the bamboo joint pile are arranged on the outer surface of the pile body of the bamboo joint pile, and annular reinforcing ribs are arranged in the annular bulges; the axis of the tubular pile is vertical to the horizontal plane; the pile top center connecting line of the tubular pile is parallel to or coincided with the pile top center connecting line of the bamboo joint pile.
Furthermore, the included angle between the axis of the tubular pile and the axis of the bamboo joint pile is not more than 30 degrees.
Further, the pile bottom degree of depth of tubular pile or bamboo joint stake is 2 ~ 2.5 times foundation ditch excavation depth.
Further, the distance between the annular bulges of the bamboo joint piles is gradually reduced along the axial direction.
Further, the pile diameter of the tubular pile is 300-600 mm; the pile diameter of the bamboo joint pile is 300-600 mm, and the height of the annular bulge of the bamboo joint pile, which protrudes out of the surface of the pile body, is 10% -30% of the pile diameter.
Further, the width direction edge of crown beam surpasss the tubular pile with the pile bolck edge of bamboo joint stake, the height more than or equal to 0.6 times of tubular pile footpath or 0.6 times of bamboo joint stake footpath of crown beam.
Further, the width direction edge unilateral of crown beam surpasss the tubular pile with the size of the pile bolck edge of bamboo joint stake is: 1/2 pile diameter of tubular pile or 1/2 bamboo joint pile diameter.
The invention also provides a construction method of the combined supporting structure of the inclined bamboo joint pile and the vertical pipe pile, which comprises the following steps: prefabricating a tubular pile and a bamboo joint pile; the outer surface of the pile body of the bamboo joint pile is provided with a plurality of annular bulges vertical to the axial line of the pile body, and annular reinforcing ribs are arranged in the annular bulges; arranging pipe piles and bamboo joint piles along the inner side of the edge of the foundation pit on site, and enabling the pipe piles and the bamboo joint piles to be alternately arranged to form a pile arrangement supporting structure; the axis of the bamboo joint pile is inclined to the horizontal plane, and the lower part of the bamboo joint pile is inclined towards the inside of the foundation pit; making the axis of the pipe pile vertical to the horizontal plane; enabling a pile top central connecting line of the tubular pile and a pile top central connecting line of the bamboo joint pile to be parallel or coincident, adopting a pile jumping construction method for the tubular pile and the bamboo joint pile, and pressing the tubular pile and the bamboo joint pile into the next precast pile at intervals of 1-2 piles; and (4) prefabricating a crown beam on the pile top of the tubular pile and the pile top of the bamboo-joint pile.
Further, setting the length of the tubular pile to be L, and arranging a cement mixing pile waterproof curtain at the position which is outside the pile top center connecting line of the tubular pile and is 0.2L away from the pile top center connecting line of the tubular pile; the construction method of the waterproof curtain of the cement mixing pile comprises the following steps:
a-1, enabling a deep layer stirrer to reach a specified pile position and centering;
step A-2, after the cooling water circulation of the deep layer stirrer is normal, starting the deep layer stirrer to enable the deep layer stirrer to stir along the guide frame, cut soil and sink;
step A-3, when the deep layer stirrer sinks to a set depth, stirring cement paste and pouring the cement paste into a collecting hopper;
step A-4, after the deep layer stirring machine sinks to the designed depth, starting a cement slurry pump to press cement slurry into a foundation, spraying the cement slurry and rotating and stirring the cement slurry, and simultaneously lifting the deep layer stirring machine according to the lifting speed determined by the design;
and step A-5, after the deep layer stirring machine is lifted to the top surface elevation of the designed depth, the deep layer stirring machine is sunk into the soil while rotating and stirring, and the deep layer stirring machine is lifted out of the ground after the design depth.
Further, the method for prefabricating the crown beam on the pile top of the tubular pile and the pile top of the bamboo joint pile comprises the following steps:
b-1, excavating the earthwork of the crown beam in a mechanical partition mode, excavating a first layer of earthwork to reach the pile top elevation of the tubular pile, removing residual soil, then beginning to remove pile head floating slurry to the designed elevation, chiseling the concrete on the top surface of the pile core, removing the pile top floating slurry, and continuing to remove the concrete until the concrete quality reaches the design requirement if the strength of the pile head concrete at the designed elevation does not reach the design requirement;
b-2, leveling the soil between the piles to the elevation of the bottom of the crown beam, and compacting by tamping;
b-3, manufacturing steel bars according to the cross section reinforcements of the crown beam; the longitudinal bars adopt HRB335 grade or HRB400 grade steel bars, and the stirrups adopt HPB300 grade steel bars; the tie bars are HRB 335-grade steel bars;
b-4, completing concrete pouring and curing; the concrete strength grade is higher than or equal to C25, and the main reinforcement of the row pile is anchored into the crown beam and is more than or equal to 35 times of the diameter of the reinforced pile.
The invention has the advantages and positive effects that: according to the combined supporting structure of the inclined bamboo joint piles and the vertical tubular piles, the tubular piles and the bamboo joint piles are alternately arranged to form an equal-height combined supporting structure, so that the axis of the tubular pile is perpendicular to the horizontal plane; the axis of the bamboo joint pile is inclined to the horizontal plane, and the lower part of the bamboo joint pile is inclined towards the inside of the foundation pit; the annular bulge of the bamboo joint pile can increase the side friction resistance, so that the axial force can be fully exerted, a larger inclined supporting force is given to the tubular pile, the displacement of the pile top is reduced to a great extent, the ground deformation after the support pile is laid is reduced, the damage to the surrounding environment is avoided, meanwhile, the bending moment of the pile body can be reduced, the design strength of the pile body is reduced, and the construction cost is reduced; the invention can increase the excavation depth, and because the excavation surface is inclined, and the bearing capacity of the bamboo joint pile is high, the settlement amount is small, the possibility of the foundation pit overturn and damage is greatly reduced, and the safety of the foundation pit engineering can be ensured; the combined supporting structure of the inclined bamboo joint piles and the vertical tubular piles enables the foundation pit engineering which may need to adopt an internal support type supporting or a pull-anchor type supporting originally to meet the design requirements only by utilizing a cantilever pile supporting, thereby enabling the design and construction to be simpler and more convenient, saving materials and reducing the engineering cost.
In conclusion, the invention can reduce the displacement of the pile top, increase the excavation depth, reduce the possibility of foundation pit overturning damage, and reduce the design strength of the support pile so as to reduce the construction cost of the foundation pit support engineering.
Drawings
Fig. 1 is a schematic view of a combined supporting structure of an inclined bamboo joint pile and a vertical pipe pile according to the present invention.
In the figure: 1-a crown beam; 2-foundation pit bottom; 3-the edge of the foundation pit; 4-bamboo joint piles; 5-pipe pile; 6-annular protrusion.
Fig. 2 is a schematic cross-sectional view of a combined supporting structure of inclined bamboo joint piles and vertical pipe piles according to the present invention.
In the figure: h1-excavation depth of the foundation pit; h2-tubular pile length; and theta is the inclination angle of the bamboo joint pile.
Detailed Description
For further understanding of the contents, features and effects of the present invention, the following embodiments are enumerated in conjunction with the accompanying drawings, and the following detailed description is given:
referring to fig. 1 to 2, a combined supporting structure of inclined bamboo joint piles and vertical pipe piles includes a row pile supporting structure formed by alternately arranging pipe piles 5 and bamboo joint piles 4; the tubular pile 5 and the bamboo joint pile 4 are arranged along the inner side of the edge 3 of the foundation pit, and the top of the tubular pile 5 and the top of the bamboo joint pile 4 are provided with a crown beam 1; the outer surface of the pile body of the bamboo joint pile 4 is provided with a plurality of annular bulges 6 vertical to the axis of the bamboo joint pile 4, and annular reinforcing ribs are arranged in the annular bulges 6 of the bamboo joint pile 4; the axis of the bamboo joint pile 4 is inclined to the horizontal plane, and the lower part of the bamboo joint pile is inclined towards the inside of the foundation pit; the axis of the tubular pile 5 is vertical to the horizontal plane; the pile top center connecting line of the tubular pile is parallel to or coincided with the pile top center connecting line of the bamboo joint pile. Tubular pile 5 with the pile bolck of bamboo joint stake 4 is located the inboard at foundation ditch border 3, and tubular pile 5 and bamboo joint stake 4 form a whole through covering roof beam 1 connection. The annular reinforcing rib can comprise a plurality of radial reinforcing steel bars which are distributed radially and a plurality of concentric annular reinforcing steel bars which are connected with the radial reinforcing steel bars, so that the spider-web-shaped annular reinforcing rib is formed. The annular reinforcing rib can also be an annular reinforcing rib with other structures.
The bamboo joint pile can comprise a tubular pile body main body, and a plurality of dry concrete reinforcing rings are distributed on the outer surface of the tubular pile body main body at intervals along the axial direction. The pile body is shaped into a concavo-convex shape, so the bamboo joint pile is named. Belonging to a special type of prestressed pipe piles. Due to the fact that the pile body is uneven, lateral friction resistance is increased after pile sinking, bearing capacity of the end-bearing friction pile and the friction pile can be improved, and the bearing capacity can be improved by 10% -15% generally. Can be used for resisting compression and pulling. The bamboo joint piles are connected mechanically, and pile splicing is simple and convenient. Before pile sinking, a special spanner is needed to screw a connecting nut into a screw thread reserved at the pile end, the pile end is firstly coated with epoxy (sealing effect) during pile splicing, and then the connecting nut of an upper pile is aligned and clamped into a clamp spring reserved in a lower pile to complete pile splicing.
The annular bulges 6 of the bamboo joint piles can be equidistantly spaced or unequally spaced along the axial direction, and when the annular bulges 6 of the bamboo joint piles are unequally spaced, the intervals of the annular bulges 6 of the bamboo joint piles along the axial direction are gradually reduced.
The center connecting line of the pile tops of the bamboo joint piles 4 can be positioned on the inner side of the center connecting line of the pile tops of the tubular piles 5; the pile spacing of adjacent tubular pile 5 and bamboo joint stake 4 can be 2 ~ 4 times the pile footpath of tubular pile or 2 ~ 4 times the pile footpath of bamboo joint stake.
The inclination angle of the axis of the tubular pile 5 relative to the axis of the bamboo joint pile 4 is larger than 0 degree and in the range of 0-30.5 degrees, and the angle of an included angle between the axis of the tubular pile and the axis of the bamboo joint pile is preferably not more than 30 degrees. As shown in fig. 2, an included angle between the axis of the pipe pile and the axis of the bamboo joint pile may be referred to as a bamboo joint pile inclination angle θ, and the bamboo joint pile inclination angle θ may be not more than 30 °. The inclination angle theta of the bamboo joint pile can be preferably 10 degrees, 12 degrees, 15 degrees, 18 degrees, 21 degrees and 24 degrees.
The pile bottom depth of the tubular pile 5 or the bamboo joint pile 4 can be 2-2.5 times of the foundation pit excavation depth H1. Namely, the height of the tubular pile 5 or the bamboo joint pile 4 from the pile bottom to the foundation pit bottom 2 is 2-2.5 times of the excavation depth H of the foundation pit1。
The pile diameter of the tubular pile can be 300-600 mm; the pile diameter of the bamboo joint pile can be 300-600 mm, and the height of the annular bulge 6 of the bamboo joint pile, which protrudes out of the surface of the pile body, can be 10% -30% of the pile diameter.
The bamboo joint piles 4 and the tubular piles 5 are provided with crown beams 1. The width of crown beam 1 can be greater than the pile head stake footpath of tubular pile 5 and bamboo joint stake 4 rather than being connected, the width direction edge of crown beam 1 can surpass tubular pile 5 with the pile head edge of bamboo joint stake 4, the height of crown beam 1 can be more than or equal to 0.6 times of the pile footpath of tubular pile 5 or 0.6 times of the pile footpath of bamboo joint stake 4.
Further, the dimension of the width direction edge of the crown beam 1 exceeding the pile top edge of the tubular pile 5 and the bamboo joint pile 4 on one side can be: 1/2 the pile diameter of the tubular pile 5 or 1/2 the pile diameter of the bamboo joint pile 4.
The length of the tubular pile 5 can be set to be L, and a cement mixing pile waterproof curtain can be arranged at the position which is outside the central connecting line of the pile top of the tubular pile 5 and is 0.2L away from the central connecting line of the pile top of the tubular pile 5.
The invention also provides an embodiment of a construction method of the combined supporting structure of the inclined bamboo joint pile and the vertical pipe pile, which comprises the following steps: prefabricating a tubular pile 5 and a bamboo joint pile 4; the outer surface of the pile body of the bamboo joint pile is provided with a plurality of annular bulges 6 vertical to the axis of the bamboo joint pile, the intervals of the annular bulges 6 are equal or unequal, and annular reinforcing ribs are arranged in the annular bulges 6; arranging pipe piles 5 and bamboo joint piles 4 along the inner side of the edge of the foundation pit on site, and enabling the pipe piles 5 and the bamboo joint piles 4 to be alternately arranged to form a pile arrangement supporting structure; the axis of the tubular pile 5 is vertical to the horizontal plane; the axis of the bamboo joint pile 4 is inclined to the horizontal plane, and the lower part of the bamboo joint pile is inclined towards the inside of the foundation pit; enabling a pile top center connecting line of the tubular pile 5 and a pile top center connecting line of the bamboo joint pile 4 to be parallel or coincident, adopting a pile jumping construction method for the tubular pile 5 and the bamboo joint pile 4, and pressing the tubular pile 5 and the bamboo joint pile 4 into the next precast pile at intervals of 1-2 piles; and (3) prefabricating a crown beam 1 on the pile top of the tubular pile 5 and the pile top of the bamboo joint pile 4. The center connecting line of the pile tops of the bamboo joint piles 4 can be positioned on the inner side of the center connecting line of the pile tops of the tubular piles 5; the pile spacing between adjacent tubular piles 5 and bamboo joint piles 4 can be 2-4 times of the pile diameter of the tubular piles or 2-4 times of the pile diameter of the bamboo joint piles.
Further, the construction sequence of laying the tubular pile 5 and the bamboo joint pile 4 along the inner side of the edge of the foundation pit on site is as follows: when the center distance of the piles is less than or equal to 4 times of the pile diameter, the piles are dense and are symmetrically driven from the middle to two sides, so that the soil body is extruded from the periphery to two sides during driving, and the construction quality is ensured. When the number of piles is large, the piles can be driven in sections. When the center distance of the piles is more than 4 times of the pile diameter, the piles are sparse, and the driving sequence or the driving mode that one side is driven in a single direction can be adopted.
Further, the length of the tubular pile 5 can be set to be L, and a cement mixing pile waterproof curtain can be arranged at the position which is outside the connecting line of the pile top centers of the tubular pile 5 and is 0.2L away from the connecting line of the pile top centers of the tubular pile 5. The construction method of the waterproof curtain of the cement mixing pile can comprise the following steps:
and step A-1, enabling the deep layer stirrer to reach the designated pile position and centering.
And step A-2, after the cooling water circulation of the deep layer stirrer is normal, starting the deep layer stirrer to enable the deep layer stirrer to stir along the guide frame, cut soil and sink.
And step A-3, when the deep layer stirrer sinks to a set depth, stirring cement paste and pouring the cement paste into a collecting hopper.
And step A-4, after the deep layer stirring machine sinks to the designed depth, starting a cement slurry pump to press cement slurry into the foundation, spraying the cement slurry while rotating and stirring, and simultaneously lifting the deep layer stirring machine according to the lifting speed determined by design.
And step A-5, after the deep layer stirring machine is lifted to the top surface elevation of the designed depth, the deep layer stirring machine is sunk into the soil while rotating and stirring, and the deep layer stirring machine is lifted out of the ground after the design depth.
Further, the method for prefabricating the crown beam 1 on the pile top of the tubular pile 5 and the pile top of the bamboo joint pile 4 can comprise the following steps:
and step B-1, excavating the earthwork of the crown beam 1 in a mechanical partition mode, excavating a first layer of earthwork to the pile top elevation of the tubular pile 5, removing residual soil, then beginning to remove pile head floating slurry to the designed elevation, chiseling concrete on the top surface of the pile core, removing the pile top floating slurry, and continuing to remove the pile head floating slurry until the concrete quality reaches the design requirement if the pile head concrete strength at the designed elevation does not reach the design requirement.
And step B-2, leveling the soil between the piles to the elevation of the bottom of the crown beam 1, and compacting by tamping.
And step B-3, manufacturing the steel bars according to the reinforcing bars on the section of the crown beam 1. The longitudinal bars adopt HRB335 grade or HRB400 grade steel bars, and the stirrups adopt HPB300 grade steel bars. The tie bars are HRB335 grade steel bars.
And step B-4, finishing concrete pouring and curing. The concrete strength grade is higher than or equal to C25, and the row pile main reinforcement is anchored into the crown beam 1 and is larger than or equal to 35 times of the diameter of the reinforced pile.
The structure, construction and operation of the present invention will be further described in the following with reference to a preferred embodiment thereof:
referring to fig. 1, a combined supporting structure of inclined bamboo joint piles and vertical pipe piles is a row pile supporting structure formed by alternately arranging pipe piles 5 and bamboo joint piles 4; the tubular pile 5 and the bamboo joint pile 4 are arranged along the inner side of the edge 3 of the foundation pit, and the top of the tubular pile 5 and the top of the bamboo joint pile 4 are provided with a crown beam 1; a plurality of annular bulges 6 are arranged on the outer surface of the pile body of the bamboo joint pile 4 along the axis direction, and annular reinforcing ribs are arranged in the annular bulges 6 of the bamboo joint pile 4; the axis of the bamboo joint pile 4 is inclined to the horizontal plane, and the lower part of the bamboo joint pile is inclined towards the inside of the foundation pit; the axis of tubular pile 5 is perpendicular to the horizontal plane, the pile bolck central line of tubular pile 5 with the pile bolck central line of bamboo joint stake 4 is parallel or coincide. The annular reinforcing rib is composed of radial reinforcing steel bars and a plurality of annular reinforcing steel bars connected with the radial reinforcing steel bars.
The tubular pile 5 is vertical fender pile, the bamboo joint stake 4 is the interior slope fender pile, and all bamboo joint stakes and all tubular piles are linked as an organic whole to the guan liang 1. And a waterproof curtain is arranged on the outer side of the central connecting line of the pile top of the tubular pile 5. The pile bottom elevation of the mixing pile of the waterproof curtain is the same as the pile bottom elevation of the combined inclined-straight alternate support pile.
The basic principle of the invention is as follows:
the tubular piles 5 and the bamboo joint piles 4 are alternately arranged to form a combined supporting structure, when the tubular piles 5 are vertical supporting piles and the bamboo joint piles 4 are inward-inclined supporting piles, the combined supporting structure formed by the bamboo joint piles 4 and the tubular piles 5 in an alternate arrangement is also called an inclined-straight alternate supporting structure, and the tubular piles 5 and the bamboo joint piles 4 are connected through pile top crown beams 1 to form a whole and are stressed together. Wherein the inward-inclined support piles are compressed and the vertical support piles are pulled. Through the crown beam 1, the inward-inclined supporting pile provides the axial force to the vertical supporting pile, and can provide the vertical supporting pile with an obliquely upward supporting force, and the supporting force is related to the side friction resistance of the inward-inclined supporting pile.
The upward oblique supporting force can effectively reduce the deformation of the pile body, thereby reducing the deformation of the foundation pit soil body, protecting surrounding buildings, increasing the excavation depth of the foundation pit and enhancing the stability of the foundation pit. When the inward-inclined supporting pile adopts the bamboo joint pile 4 to support the foundation pit, the annular bulge 6 of the bamboo joint pile 4 increases the contact area between the bamboo joint pile 4 and the soil body, particularly the soil layer with a good bottom, can effectively increase the side friction resistance, increases the contact area between the supporting structure and the soil body, particularly the soil layer with a good bottom, and can effectively increase the side friction resistance, thereby increasing the supporting force in the inclined direction and further controlling the displacement of the foundation pit.
The invention can effectively exert the inclined supporting force, thereby reducing the inclination angle of the inward inclined supporting piles, shortening the pile length of each supporting pile, for example reducing the pile length H of a pipe pile2And the length of the bamboo joint piles 4 increases the pile spacing of the supporting piles, and reduces the pile diameter of the supporting piles. Before construction, an optimal inclined-straight alternate supporting structure and an inclination angle of an inner inclined supporting pile relative to a vertical supporting pile are determined according to site conditions and calculation analysis, and pile length and pile body strength are designed. The invention is only suitable for the cantilever pile supporting mode. The invention recommends that the inclination angle of the inward-inclined support piles, namely the bamboo joint piles 4, is more than 0 degree and less than or equal to 30.5 degrees; the pile bottom depth of the bamboo joint pile 4 and the tubular pile 5 is 2-2.5 times of the excavation depth H of the foundation pit1(ii) a The pile spacing between adjacent bamboo joint piles 4 and the pile pipe 5 is 2-2.5 times of the pile diameter. The pile diameter of the tubular pile 5 can be 300-600 mm, and the pile diameter of the bottom of the bamboo joint pile 4 can be 300-600 mm. The height of the annular bulge 6 of the bamboo joint pile, which protrudes out of the surface of the pile body, can be 15% -20% of the pile diameter.
A construction method of a combined supporting structure of an inclined bamboo joint pile and a vertical pipe pile comprises the following steps:
prefabricating a pipe pile 5 and a bamboo joint pile 4 with equal length; a plurality of annular bulges 6 vertical to the axis of the bamboo joint pile are arranged on the outer surface of the pile body of the bamboo joint pile, the intervals of the annular bulges 6 are equal, and annular reinforcing ribs are arranged in the annular bulges 6; arranging tubular piles 5 and bamboo joint piles 4 on site, and enabling the tubular piles 5 and the bamboo joint piles 4 to be alternately arranged; the axis of the tubular pile 5 is vertical to the horizontal plane; the axis of the bamboo joint pile 4 is inclined to the horizontal plane, and the lower part of the bamboo joint pile is inclined towards the inside of the foundation pit; the connecting line of the pile top centers of the tubular piles 5 is parallel to the connecting line of the pile top centers of the bamboo joint piles 4, the bamboo joint piles 4 are arranged along the inner side of the edge 3 of the foundation pit, and the tubular piles 5 are positioned on the inner side of the connecting line of the pile top centers of the bamboo joint piles 4; the tubular pile 5 and the bamboo joint pile 4 are both driven into the next precast pile at intervals of 1-2 piles by adopting a pile jumping construction method; and (3) prefabricating a crown beam 1 on the pile top of the tubular pile 5 and the pile top of the bamboo joint pile 4.
The construction method of the bamboo joint pile 4 comprises the following steps:
1) after the pile tip is arranged at the small nut end of the bottom pile, the pile is driven. And adjusting the verticality by about 50 centimeters of the pile into the soil. The verticality deviation of the first section of pile inserted into the ground is not more than 0.3%. When the bottom pile is driven into the ground beyond 1/3 of the pile, the pile driver cannot be forcibly moved again to adjust the verticality. When the pile body inclines, the construction is carried out after the reason is found out. The pile body is prevented from being forcibly adjusted to be broken or injured.
2) And (5) adjusting the verticality to start pile sinking. When the pile is sunk, the position of the clamp is noted, the clamp is clamped at the position where the bamboo joint pile protrudes, the clamp is forbidden to be clamped at the position where the bamboo joint pile protrudes, and the position where the end of the bamboo joint pile is more than 20 cm, wherein the two positions are the most fragile positions of the bamboo joint pile.
3) And stopping pressing the pile when the distance between the top end of the first pile section and the cantilever of the pile machine is 40 cm. The end of the large nut of the pile is poured with a mixture of epoxy resin and a curing agent, and the mixture is poured on the pile head by one circle inside and outside.
4) The upper pile section and the lower pile section are mechanically connected in a buckling manner.
Setting the length of the tubular pile 5 to be L, and arranging a cement mixing pile waterproof curtain at the position which is outside the pile top center connecting line of the tubular pile 5 and is 0.2L away from the pile top center connecting line of the tubular pile 5; the elevation of the bottom of the stirring pile of the waterproof curtain is the same as that of the bottom of the tubular pile 5.
The construction method of the waterproof curtain of the cement mixing pile comprises the following steps:
1) positioning: and the deep mixer reaches the designated pile position and is centered.
2) Pre-stirring and sinking: after the cooling water circulation of the deep layer stirrer is normal, starting a stirrer motor, and loosening a sling of the stirrer to enable the stirrer to stir along the guide frame, cut soil and sink.
3) Preparing cement paste: when the deep layer stirrer sinks to a certain depth, the cement paste is stirred according to the mixing ratio determined by the design, and the cement paste is poured into the collecting hopper before grouting.
4) Lifting, spraying and stirring: after the deep mixer sinks to the design degree of depth, open the mortar pump and impress grout into the ground, and spout thick liquid, rotatory simultaneously, strictly according to the lifting speed who designs and confirm promotes deep mixer.
5) Repeating the upper stirring and the lower stirring: when the deep-layer stirring machine is lifted to the top surface elevation of the designed depth, the cement slurry in the collecting hopper is just emptied. For the time soft soil and grout stirring, can be once more with the mixer rotatory while sinking in soil, promote the mixer out of ground again after the design consolidates the degree of depth.
6) Cleaning: and (4) cleaning residual cement paste in all pipelines, and cleaning soft soil adhered to the stirring head.
7) And (3) shifting: and moving the deep layer stirring machine to the next pile position, and repeating the steps.
The top of the bamboo joint pile 4 and the tubular pile 5 is provided with a crown beam 1. The width of the crown beam 1 is recommended to be larger than the pile diameter of a pipe pile 5 or the pile diameter of a bamboo joint pile 4 connected with the crown beam, and the height of the crown beam 1 can be larger than or equal to 0.6 time of the pile diameter of the pipe pile 5 or 0.6 time of the pile diameter of the bamboo joint pile 4. The two sides of the crown beam 1 along the width direction are respectively expanded with the pile diameter of 1/2 tubular piles 5 or the pile diameter of 1/2 bamboo joint piles 4.
The construction method of the crown beam 1 comprises the following steps:
1) the method comprises the steps that mechanical partition excavation is adopted for the earthwork of the crown beam 1, a first layer of earthwork is excavated to the designed pile top elevation of the supporting pile, pile head floating slurry is broken to the designed elevation after residual soil is removed, the concrete on the top surface of the pile core needs to be chiseled, and pile top floating slag is removed, if the strength of the pile head concrete at the designed elevation does not meet the design requirement, the pile head concrete needs to be broken continuously until the concrete quality meets the design requirement, and the crown beam 1 concrete is poured and formed together when the section with the elevation is insufficient.
2) And (5) manually leveling the soil between the piles to the elevation of the bottom of the crown beam 1, and compacting by tamping.
3) And (4) after the pile head is broken, manufacturing the steel bars according to the reinforcing bars on the section of the crown beam 1. And the blanking and binding errors of the reinforcing steel bars are ensured to meet the requirements of design and construction specifications.
4) And checking the elevation of the crown beam 1 and installing a template. The formwork support needs to ensure the stability and firmness of the formwork to prevent the deformation of the formwork when concrete is poured, and the section size of the formwork is manufactured according to the section of the crown beam 1.
5) And finishing the reinforcing steel bar engineering. The longitudinal bars are preferably HRB335 grade or HRB400 grade steel bars, and the stirrups and the tie bars are HPB300 grade and HRB335 grade steel bars.
6) And finishing concrete pouring and maintenance. The concrete strength grade should not be lower than C25, and the row pile main reinforcement anchored into the crown beam 1 should not be less than 35d (d is the diameter of the steel bar pile).
The above-mentioned embodiments are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to carry out the same, and the present invention shall not be limited to the embodiments, i.e. the equivalent changes or modifications made within the spirit of the present invention shall fall within the scope of the present invention.
Claims (10)
1. A combined supporting structure of inclined bamboo joint piles and vertical tubular piles is characterized by comprising a row pile supporting structure formed by alternately arranging tubular piles and bamboo joint piles; the tubular pile and the bamboo joint pile are arranged along the inner side of the edge of the foundation pit, and the pile tops of the tubular pile and the bamboo joint pile are provided with crown beams; the axis of the bamboo joint pile is inclined to the horizontal plane, the lower part of the bamboo joint pile is inclined to the interior of the foundation pit, a plurality of annular bulges vertical to the axis of the bamboo joint pile are arranged on the outer surface of the pile body of the bamboo joint pile, and annular reinforcing ribs are arranged in the annular bulges; the axis of the tubular pile is vertical to the horizontal plane; the pile top center connecting line of the tubular pile is parallel to or coincided with the pile top center connecting line of the bamboo joint pile.
2. The combined supporting structure of the inclined bamboo joint pile and the vertical pipe pile according to claim 1, wherein an included angle between an axis of the pipe pile and an axis of the bamboo joint pile is not more than 30 degrees.
3. The combined supporting structure of the inclined bamboo joint pile and the vertical pipe pile according to claim 1, wherein the pile bottom depth of the pipe pile or the bamboo joint pile is 2-2.5 times of the excavation depth of a foundation pit.
4. The combined supporting structure of the inclined bamboo joint piles and the vertical pipe piles according to claim 1, wherein the distance between the annular protrusions of the bamboo joint piles is gradually reduced along the axial direction.
5. The combined supporting structure of the inclined bamboo joint piles and the vertical tubular piles according to claim 1, wherein the pile diameter of the tubular pile is 300-600 mm; the pile diameter of the bamboo joint pile is 300-600 mm, and the height of the annular bulge of the bamboo joint pile, which protrudes out of the surface of the pile body, is 10% -30% of the pile diameter.
6. The combined supporting structure of the inclined bamboo-joint pile and the vertical tubular pile according to claim 1, wherein the width direction edge of the crown beam exceeds the tubular pile and the pile top edge of the bamboo-joint pile, and the height of the crown beam is greater than or equal to 0.6 time of the pile diameter of the tubular pile or 0.6 time of the pile diameter of the bamboo-joint pile.
7. The combined supporting structure of the inclined bamboo-joint pile and the vertical pipe pile according to claim 6, wherein the dimension of the width-direction edge of the crown beam beyond the top edges of the pipe pile and the bamboo-joint pile is as follows: 1/2 pile diameter of tubular pile or 1/2 bamboo joint pile diameter.
8. A construction method of a combined supporting structure of an inclined bamboo joint pile and a vertical pipe pile is characterized by comprising the following steps: prefabricating a tubular pile and a bamboo joint pile; the outer surface of the pile body of the bamboo joint pile is provided with a plurality of annular bulges vertical to the axial line of the pile body, and annular reinforcing ribs are arranged in the annular bulges; arranging pipe piles and bamboo joint piles along the inner side of the edge of the foundation pit on site, and enabling the pipe piles and the bamboo joint piles to be alternately arranged to form a pile arrangement supporting structure; the axis of the bamboo joint pile is inclined to the horizontal plane, and the lower part of the bamboo joint pile is inclined towards the inside of the foundation pit; making the axis of the pipe pile vertical to the horizontal plane; enabling a pile top central connecting line of the tubular pile and a pile top central connecting line of the bamboo joint pile to be parallel or coincident, adopting a pile jumping construction method for the tubular pile and the bamboo joint pile, and pressing the tubular pile and the bamboo joint pile into the next precast pile at intervals of 1-2 piles; and (4) prefabricating a crown beam on the pile top of the tubular pile and the pile top of the bamboo-joint pile.
9. The method for constructing a combined supporting structure of an inclined bamboo joint pile and a vertical tubular pile according to claim 8, wherein the length of the tubular pile is set to be L, and a cement mixing pile waterproof curtain is arranged outside a pile top center connecting line of the tubular pile and at a distance of 0.2L from the pile top center connecting line of the tubular pile; the construction method of the waterproof curtain of the cement mixing pile comprises the following steps:
a-1, enabling a deep layer stirrer to reach a specified pile position and centering;
step A-2, after the cooling water circulation of the deep layer stirrer is normal, starting the deep layer stirrer to enable the deep layer stirrer to stir along the guide frame, cut soil and sink;
step A-3, when the deep layer stirrer sinks to a set depth, stirring cement paste and pouring the cement paste into a collecting hopper;
step A-4, after the deep layer stirring machine sinks to the designed depth, starting a cement slurry pump to press cement slurry into a foundation, spraying the cement slurry and rotating and stirring the cement slurry, and simultaneously lifting the deep layer stirring machine according to the lifting speed determined by the design;
and step A-5, after the deep layer stirring machine is lifted to the top surface elevation of the designed depth, the deep layer stirring machine is sunk into the soil while rotating and stirring, and the deep layer stirring machine is lifted out of the ground after the design depth.
10. The construction method of a combined supporting structure of an inclined bamboo joint pile and a vertical pipe pile according to claim 8, wherein the method for prefabricating the crown beam on the pile top of the pipe pile and the pile top of the bamboo joint pile comprises the following steps:
b-1, excavating the earthwork of the crown beam in a mechanical partition mode, excavating a first layer of earthwork to reach the pile top elevation of the tubular pile, removing residual soil, then beginning to remove pile head floating slurry to the designed elevation, chiseling the concrete on the top surface of the pile core, removing the pile top floating slurry, and continuing to remove the concrete until the concrete quality reaches the design requirement if the strength of the pile head concrete at the designed elevation does not reach the design requirement;
b-2, leveling the soil between the piles to the elevation of the bottom of the crown beam, and compacting by tamping;
b-3, manufacturing steel bars according to the cross section reinforcements of the crown beam; the longitudinal bars adopt HRB335 grade or HRB400 grade steel bars, and the stirrups adopt HPB300 grade steel bars; the tie bars are HRB 335-grade steel bars;
b-4, completing concrete pouring and curing; the concrete strength grade is higher than or equal to C25, and the main reinforcement of the row pile is anchored into the crown beam and is more than or equal to 35 times of the diameter of the reinforced pile.
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