CN111962524A - Combined supporting structure of inclined tubular pile and vertical bamboo joint pile and construction method thereof - Google Patents
Combined supporting structure of inclined tubular pile and vertical bamboo joint pile and construction method thereof Download PDFInfo
- Publication number
- CN111962524A CN111962524A CN202010871436.3A CN202010871436A CN111962524A CN 111962524 A CN111962524 A CN 111962524A CN 202010871436 A CN202010871436 A CN 202010871436A CN 111962524 A CN111962524 A CN 111962524A
- Authority
- CN
- China
- Prior art keywords
- pile
- bamboo joint
- tubular
- piles
- bamboo
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011425 bamboo Substances 0.000 title claims abstract description 195
- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 193
- 235000017491 Bambusa tulda Nutrition 0.000 title claims abstract description 193
- 241001330002 Bambuseae Species 0.000 title claims abstract description 193
- 235000015334 Phyllostachys viridis Nutrition 0.000 title claims abstract description 193
- 238000010276 construction Methods 0.000 title claims abstract description 34
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 15
- 238000009412 basement excavation Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 37
- 239000004568 cement Substances 0.000 claims description 31
- 239000004567 concrete Substances 0.000 claims description 30
- 239000002689 soil Substances 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 11
- 238000007667 floating Methods 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 4
- 230000009191 jumping Effects 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 8
- 238000009415 formwork Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a combined supporting structure of an inclined pipe pile and a vertical bamboo joint pile, which comprises a row pile supporting structure formed by alternately arranging pipe 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 vertical to the horizontal plane, the outer surface of the pile body of the bamboo joint pile is provided with a plurality of annular bulges vertical to the axis of the bamboo joint pile, and annular reinforcing ribs are arranged in the annular bulges; the axis of the tubular pile is inclined to the horizontal plane, and the lower part of the tubular pile is inclined towards the inside of the foundation pit; 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 tubular pile and the vertical wedge-shaped 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 pipe pile and a vertical bamboo joint 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 pipe pile and a vertical bamboo joint pile and a construction method thereof for 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 an inclined pipe pile and a vertical bamboo joint pile comprises a row pile supporting structure formed by alternately arranging the pipe pile and the bamboo joint pile; 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 vertical to the horizontal plane, the outer surface of the pile body of the bamboo joint pile is provided with a plurality of annular bulges vertical to the axis of the bamboo joint pile, and annular reinforcing ribs are arranged in the annular bulges; the axis of the tubular pile is inclined to the horizontal plane, and the lower part of the tubular pile is inclined towards the inside of the foundation pit; 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 tubular pile and the vertical bamboo joint 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 vertical to the horizontal plane; the axis of the tubular pile is inclined to the horizontal plane, and the lower part of the tubular pile is inclined to the inside of the foundation pit; 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 bamboo joint pile to be L, and arranging a cement mixing pile waterproof curtain at the position which is outside the connecting line of the centers of the pile tops of the bamboo joint piles and is 0.2L away from the connecting line of the centers of the pile tops of the bamboo joint piles; 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:
step 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 bamboo joint pile, removing residual soil, then beginning to remove pile head floating slurry to a designed elevation, chiseling concrete on the top surface of the pile core, removing pile top floating slag, and continuing to remove the concrete until the concrete quality reaches the designed requirement if the strength of the pile head concrete at the designed elevation does not reach the designed 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 tubular pile and the vertical bamboo joint pile, the tubular pile and the bamboo joint pile are alternately arranged to form the equal-height combined supporting structure, so that the axis of the bamboo joint pile is perpendicular to the horizontal plane, the axis of the tubular pile is inclined to the horizontal plane, and the lower part of the tubular pile is inclined towards the inside of a 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, greater pulling force is given to the tubular pile, the displacement of the pile top is reduced to a great extent, the ground deformation after the pile is arranged is greatly 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 tubular piles and the bamboo joint piles are alternately arranged to form an equal-height combined supporting structure, so that the design requirement can be met only by utilizing the cantilever pile support in the foundation pit engineering which possibly needs an internal support type support or a pull anchor type support, the design and construction are simpler and more convenient, the materials are saved, and the engineering cost is reduced.
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 pipe pile and a vertical bamboo joint pile.
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 an inclined pipe pile and a vertical bamboo joint pile according to the present invention.
In the figure: h1-excavation depth of the foundation pit; h2-bamboo joint pile length; theta-inclination angle of the pipe 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 an inclined pipe pile and a vertical bamboo joint pile comprises 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 axis of the bamboo joint pile 4 is vertical to the horizontal plane, a plurality of annular bulges 6 vertical to the axis of the bamboo joint pile 4 are arranged on the outer surface of the pile body 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 tubular pile is inclined to the horizontal plane, and the lower part of the tubular pile is inclined towards the inside of the foundation pit; 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 pile top center connecting line of the tubular pile 5 can be positioned on the inner side of the pile top center connecting line of the bamboo joint pile 4; 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 pipe pile inclination angle θ, and the pipe pile inclination angle θ may be not greater than 30 °. The inclination angle theta of the tubular 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 bamboo joint pile 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 centers of the pile tops of the bamboo joint piles and is 0.2L away from the connecting line of the centers of the pile tops of the bamboo joint piles.
The invention also provides an embodiment of a construction method of the combined supporting structure of the inclined tubular pile and the vertical bamboo joint 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 bamboo joint pile 4 is vertical to the horizontal plane; the axis of the tubular pile 5 is inclined to the horizontal plane, and the lower part of the tubular pile is inclined to 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 central connecting line of the pile top of the tubular pile 5 can be positioned at the inner side of the central connecting line of the pile top of the bamboo joint pile 4; 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 bamboo joint pile 4 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 centers of the pile tops of the bamboo joint pile 4 and is 0.2L away from the connecting line of the centers of the pile tops of the bamboo joint pile 4; 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 by mechanical partition, excavating a first layer of earthwork to the pile top elevation of the bamboo joint pile 4, removing residual soil, then beginning to remove pile head floating slurry to the designed elevation, roughening the concrete on the top surface of the pile core, and removing the pile top floating slag, wherein if the strength of the pile head concrete at the designed elevation does not meet the design requirement, the pile head concrete is continuously removed until the quality of the concrete meets 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.
B-3, manufacturing steel bars according to the section reinforcements 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.
B-4, completing 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 an inclined pipe pile and a vertical bamboo joint pile is formed by alternately arranging pipe piles 5 and bamboo joint piles 4 to form a row pile supporting structure; 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 axis of the bamboo joint pile 4 is vertical to the horizontal plane, 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 tubular pile is inclined to the horizontal plane, and the lower part of the tubular pile is inclined towards the inside of the foundation pit; 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 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 bamboo joint piles 4 are vertical supporting piles, the tubular piles 5 are inward-inclined supporting piles, and the crown beam 1 connects all the bamboo joint piles and all the tubular piles into a whole. And a waterproof curtain is arranged on the outer side of the connecting line of the centers of the pile tops of the bamboo joint piles 4. 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:
when the vertical supporting piles are the bamboo joint piles 4 and the inward-inclined supporting piles are the tubular piles 5, the combined supporting structure formed by the tubular piles 5 and the bamboo joint piles 4 which are alternately arranged is also called an inclined-straight alternate supporting structure, and the tubular piles 5 and the bamboo joint piles 4 are connected through the pile top crown beams 1 to form a whole and are stressed together. Wherein, the tubular pile 5 is pressed, and the bamboo joint pile 4 is pulled. Through the crown beam 1, the bamboo joint pile 4 provides the axial force to the tubular pile 5, and the tubular pile 5 can be provided with a downward pulling force, and the pulling force is related to the side frictional resistance of the bamboo joint pile 4.
The tension can effectively reduce the deformation of the pile body, thereby reducing the deformation of the foundation pit soil body, protecting the surrounding buildings, and increasing the excavation depth H of the foundation pit1And the stability of the foundation pit is enhanced. When the vertical supporting pile adopts the bamboo joint pile 4 to support the foundation pit, the outer surface of the pile body of the bamboo joint pile 4 is provided with the annular bulge, so that the contact area between the bamboo joint pile and the soil body, particularly the soil layer with good bottom is increased, the side friction resistance can be effectively increased, the pulling force of the bamboo joint pile is increased, and the foundation pit displacement is further controlled.
Compared with other supporting structures, the invention can effectively exert the tension of the bamboo joint pile 4, thereby shortening the bamboo joint pilePile length H2The pile spacing of the supporting piles is increased, and the pile diameter of the supporting piles is reduced. Before construction, the optimal inclination angle of the tubular pile is determined according to site conditions and calculation analysis, and the pile length and the pile body strength of the bamboo joint pile 4 and the tubular pile 5 are designed. The invention is suitable for a cantilever pile supporting mode. The invention recommends that the inclination angle of the tubular pile 5 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, the pile diameter of the bamboo joint pile 4 can be 300-600 mm, and the height of the annular bulge 6 of the bamboo joint pile protruding 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 pipe pile and a vertical bamboo joint pile comprises the following steps:
prefabricating a pipe pile 5 and a bamboo joint pile 4 with equal length; 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 bamboo joint pile 4 is vertical to the horizontal plane, and the area of the cross section of the bamboo joint pile is sequentially reduced from the pile top to the pile bottom; the axis of the tubular pile 5 is inclined to the horizontal plane, and the lower part of the tubular pile is inclined to 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 bamboo joint pile 4 to be L, and arranging a cement mixing pile waterproof curtain at the position which is outside the connecting line of the pile top centers of the bamboo joint pile 4 and is 0.2L away from the connecting line of the pile top centers of the bamboo joint pile 4; the elevation of the pile bottom of the stirring pile of the waterproof curtain is the same as the elevation of the pile bottom of the bamboo joint pile 4.
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 an inclined pipe pile and a vertical bamboo joint pile is characterized by comprising a row pile supporting structure formed by alternately arranging pipe 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 vertical to the horizontal plane, the outer surface of the pile body of the bamboo joint pile is provided with a plurality of annular bulges vertical to the axis of the bamboo joint pile, and annular reinforcing ribs are arranged in the annular bulges; the axis of the tubular pile is inclined to the horizontal plane, and the lower part of the tubular pile is inclined towards the inside of the foundation pit; 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 pipe pile and the vertical bamboo joint 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 tubular pile and the vertical bamboo joint pile as claimed in claim 1, wherein the depth of the pile bottom of the tubular 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 pipe pile and the vertical bamboo joint pile according to claim 1, wherein the distance between the annular protrusions of the bamboo joint pile is gradually reduced along the axial direction.
5. The combined supporting structure of the inclined tubular pile and the vertical bamboo joint pile according to claim 1, wherein the 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 tubular pile and the vertical bamboo-joint 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 tubular pile and the vertical bamboo-joint pile according to claim 6, wherein the dimension of the width direction edge of the crown beam beyond the top edges of the tubular 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 pipe pile and a vertical bamboo joint 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 vertical to the horizontal plane; the axis of the tubular pile is inclined to the horizontal plane, and the lower part of the tubular pile is inclined to the inside of the foundation pit; 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 the inclined tubular pile and the vertical bamboo joint pile as claimed in claim 8, wherein the length of the bamboo joint pile is set to be L, and a cement mixing pile waterproof curtain is arranged at the position which is outside the connecting line of the centers of the pile tops of the bamboo joint piles and is 0.2L away from the connecting line of the centers of the pile tops of the bamboo joint piles; 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 pipe pile and a vertical bamboo joint 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:
step 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 bamboo joint pile, removing residual soil, then beginning to remove pile head floating slurry to a designed elevation, chiseling concrete on the top surface of the pile core, removing pile top floating slag, and continuing to remove the concrete until the concrete quality reaches the designed requirement if the strength of the pile head concrete at the designed elevation does not reach the designed 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010871436.3A CN111962524A (en) | 2020-08-26 | 2020-08-26 | Combined supporting structure of inclined tubular pile and vertical bamboo joint pile and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010871436.3A CN111962524A (en) | 2020-08-26 | 2020-08-26 | Combined supporting structure of inclined tubular pile and vertical bamboo joint pile and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111962524A true CN111962524A (en) | 2020-11-20 |
Family
ID=73391368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010871436.3A Pending CN111962524A (en) | 2020-08-26 | 2020-08-26 | Combined supporting structure of inclined tubular pile and vertical bamboo joint pile and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111962524A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001011856A (en) * | 1999-04-30 | 2001-01-16 | Mitani Sekisan Co Ltd | Burying method for existing pile |
| CN204059341U (en) * | 2013-12-17 | 2014-12-31 | 上海岩土工程勘察设计研究院有限公司 | Bamboo joint type mortar pile |
| CN108239975A (en) * | 2018-03-15 | 2018-07-03 | 天津建城基业集团有限公司 | A kind of combined type foundation pit supporting pile and a kind of combined type pattern foundation pit supporting structure mode |
| CN109440778A (en) * | 2018-11-24 | 2019-03-08 | 天津大学 | Active inclined in two-way method for supporting and protecting row pile pit |
| CN110206046A (en) * | 2019-03-27 | 2019-09-06 | 河海大学 | The interpolation steel reinforcement cage bamboo joint pile supporting construction and its construction method of harnessing landslide |
| CN111287193A (en) * | 2020-02-19 | 2020-06-16 | 天津大学 | Foundation pit supporting structure utilizing steel sheet piles and concrete precast piles and supporting method thereof |
| CN212506307U (en) * | 2020-08-26 | 2021-02-09 | 天津大学 | Combined supporting structure of inclined tubular pile and vertical bamboo joint pile |
-
2020
- 2020-08-26 CN CN202010871436.3A patent/CN111962524A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001011856A (en) * | 1999-04-30 | 2001-01-16 | Mitani Sekisan Co Ltd | Burying method for existing pile |
| CN204059341U (en) * | 2013-12-17 | 2014-12-31 | 上海岩土工程勘察设计研究院有限公司 | Bamboo joint type mortar pile |
| CN108239975A (en) * | 2018-03-15 | 2018-07-03 | 天津建城基业集团有限公司 | A kind of combined type foundation pit supporting pile and a kind of combined type pattern foundation pit supporting structure mode |
| CN109440778A (en) * | 2018-11-24 | 2019-03-08 | 天津大学 | Active inclined in two-way method for supporting and protecting row pile pit |
| CN110206046A (en) * | 2019-03-27 | 2019-09-06 | 河海大学 | The interpolation steel reinforcement cage bamboo joint pile supporting construction and its construction method of harnessing landslide |
| CN111287193A (en) * | 2020-02-19 | 2020-06-16 | 天津大学 | Foundation pit supporting structure utilizing steel sheet piles and concrete precast piles and supporting method thereof |
| CN212506307U (en) * | 2020-08-26 | 2021-02-09 | 天津大学 | Combined supporting structure of inclined tubular pile and vertical bamboo joint pile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111287193A (en) | Foundation pit supporting structure utilizing steel sheet piles and concrete precast piles and supporting method thereof | |
| CN109440778B (en) | Active bidirectional inclined row pile foundation pit supporting method | |
| CN111236258A (en) | Prefabricated pile wall supporting structure with stiffening rib wall and unloading platform and construction method thereof | |
| CN110387877A (en) | A kind of stiff composite pile construction technology | |
| CN111455973A (en) | Composite foundation structure of prefabricated solid CFG pile and construction method thereof | |
| CN212506307U (en) | Combined supporting structure of inclined tubular pile and vertical bamboo joint pile | |
| CN116856932B (en) | Large-diameter prestress assembly vertical shaft structure containing glass fiber rib part and construction method | |
| CN212506310U (en) | Combined supporting structure of inclined bamboo joint pile and vertical pipe pile | |
| CN212506309U (en) | Combined supporting structure of inclined bamboo joint piles and vertical bamboo joint piles | |
| CN212506308U (en) | Combined supporting structure of inclined tubular pile and vertical wedge-shaped pile | |
| CN212506305U (en) | Combined supporting structure of inclined wedge-shaped pile and vertical wedge-shaped pile | |
| CN212506306U (en) | Combined supporting structure of inclined wedge-shaped pile and vertical tubular pile | |
| CN109440781B (en) | Active inclined double-row pile foundation pit supporting method | |
| CN111287194A (en) | Recyclable foundation pit supporting structure using inclined steel sheet piles and supporting method thereof | |
| CN115450250B (en) | Reinforced cement stabilized macadam retaining wall structure and construction method | |
| CN111236259A (en) | Combined lattice-shaped prefabricated pile wall supporting structure and construction method thereof | |
| CN111962522A (en) | Combined supporting structure of inclined wedge-shaped pile and vertical pipe pile and construction method thereof | |
| CN111962524A (en) | Combined supporting structure of inclined tubular pile and vertical bamboo joint pile and construction method thereof | |
| CN114108694B (en) | Micro-disturbance anti-floating underground cylindrical structure and construction method thereof | |
| CN111962520A (en) | Combined supporting structure of inclined bamboo joint piles and vertical pipe piles and construction method thereof | |
| CN111962519A (en) | Combined supporting structure of inclined bamboo joint piles and vertical bamboo joint piles and construction method thereof | |
| CN210049264U (en) | Assembled foundation | |
| CN114108653A (en) | Supporting structure for preventing large-area continuous collapse of foundation pit enclosure and construction method | |
| CN109989415B (en) | Construction method of fabricated foundation | |
| CN111962523A (en) | Combined supporting structure of inclined tubular pile and vertical wedge-shaped pile and construction method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |