CN212506309U - Combined supporting structure of inclined bamboo joint piles and vertical bamboo joint piles - Google Patents

Abstract

The utility model discloses a combined supporting structure of inclined bamboo joint piles and vertical bamboo joint piles, which is characterized by comprising bamboo joint piles A arranged obliquely to a horizontal plane and bamboo joint piles B arranged perpendicular to the horizontal plane, wherein the bamboo joint piles A and the bamboo joint piles B are alternately arranged to form a piling supporting structure; the bamboo joint pile A and the bamboo joint pile B are arranged along the inner side of the edge of the foundation pit, and crown beams are arranged on the pile tops of the bamboo joint pile A and the bamboo joint pile B; the lower part of the bamboo joint pile A inclines towards the inside of the foundation pit, the outer surfaces of the pile bodies of the bamboo joint pile A and the bamboo joint pile B are respectively provided with a plurality of annular bulges vertical to the axial line, and annular reinforcing ribs are arranged in the annular bulges; the connecting line of the pile top centers of the bamboo joint piles A is parallel to or coincided with the connecting line of the pile top centers of the bamboo joint piles B. The utility model discloses can reduce the pile bolck displacement, increase the excavation degree of depth, reduce the foundation ditch and overturn destruction possibility, can reduce a fender pile design intensity in order to reduce the cost.

Description

Combined supporting structure of inclined bamboo joint piles and vertical bamboo joint piles

Technical Field

The utility model relates to a supporting construction of foundation ditch, in particular to combination supporting construction of slope bamboo joint stake and vertical bamboo joint stake.

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.

SUMMERY OF THE UTILITY MODEL

The utility model provides a combined supporting structure of slope bamboo joint stake and vertical bamboo joint stake for solving the technical problem that exists among the well-known technology.

The utility model discloses a solve the technical scheme that technical problem that exists among the well-known technique took and be: a combined supporting structure of inclined bamboo joint piles and vertical bamboo joint piles comprises bamboo joint piles A arranged obliquely to a horizontal plane and bamboo joint piles B arranged perpendicular to the horizontal plane, wherein the bamboo joint piles A and the bamboo joint piles B are alternately arranged to form a row pile supporting structure; the bamboo joint pile A and the bamboo joint pile B are arranged along the inner side of the edge of the foundation pit, and crown beams are arranged on the pile tops of the bamboo joint pile A and the bamboo joint pile B; the lower part of the bamboo joint pile A inclines towards the inside of a foundation pit, the outer surfaces of pile bodies of the bamboo joint pile A and the bamboo joint pile B are respectively provided with a plurality of annular bulges vertical to the axis, and annular reinforcing ribs are arranged in the annular bulges; and the pile top central connecting line of the bamboo joint pile A is parallel to or coincided with the pile top central connecting line of the bamboo joint pile B.

Further, an included angle between the axis of the bamboo joint pile A and the axis of the bamboo joint pile B is not more than 30 degrees.

Further, the pile bottom depth of the bamboo joint pile A or the bamboo joint pile B is 2-2.5 times of the excavation depth of the foundation pit.

Further, the distance between the annular protrusions of the bamboo joint pile A or the annular protrusions of the bamboo joint pile B is gradually reduced along the axial direction.

Further, the diameter of the bamboo joint pile A or the bamboo joint pile B is 300-600 mm; the height of the annular bulge of the bamboo joint pile A or the bamboo joint pile B protruding out of the surface of the pile body is 10% -30% of the pile diameter.

Further, the width direction edge of the crown beam exceeds the pile top edges of the bamboo joint pile A and the bamboo joint pile B, and the height of the crown beam is more than or equal to 0.6 time of the pile diameter of the bamboo joint pile A or the bamboo joint pile B.

Further, the dimension of the edge of the crown beam in the width direction exceeding the top edge of the bamboo joint pile A and the top edge of the bamboo joint pile B is as follows: the diameter of the bamboo joint pile A or the bamboo joint pile B is 0.5 times of the diameter of the bamboo joint pile A or the bamboo joint pile B.

Further, the length of the bamboo joint pile B is set to be L, and a cement mixing pile waterproof curtain is arranged on the outer side of the connecting line of the pile top centers of the bamboo joint pile B and 0.2L away from the connecting line of the pile top centers of the bamboo joint pile B.

Furthermore, the annular bulge is formed by the common bottom surface of the upper conical surface and the lower conical surface, and the conicity of the upper conical surface is larger than that of the lower conical surface.

Furthermore, the annular reinforcing ribs comprise a plurality of radial reinforcing steel bars distributed in a radial mode and a plurality of concentric annular reinforcing steel bars connected with the radial reinforcing steel bars.

The utility model has the advantages and positive effects that: in the combined supporting structure of the inclined bamboo joint piles and the vertical bamboo joint piles, the bamboo joint piles A and the bamboo joint piles B are alternately arranged to form a high-altitude combined supporting structure, so that the axes of the bamboo joint piles B are perpendicular to the horizontal plane; the axis of the bamboo joint pile A is inclined to the horizontal plane, and the lower part of the bamboo joint pile A is inclined towards the inside of the foundation pit; the side friction resistance can be increased by the annular bulges of the bamboo joint piles A and B, so that the axial force can be fully exerted; the bamboo joint pile A provides a larger diagonal bracing force with the bamboo joint pile B, so that the pile top displacement is reduced to a great extent, the ground deformation is reduced after the support piles are arranged, the damage to the surrounding environment is avoided, meanwhile, the pile body bending moment can be reduced, the design strength of the pile body is reduced, and the construction cost is reduced; the utility model 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 utility model discloses a combination supporting construction of this kind of slope bamboo joint stake and vertical bamboo joint stake makes the foundation ditch engineering that probably needs to adopt the internal stay formula to strut or draw the anchor formula to strut originally, can only utilize the cantilever pile to strut and just can satisfy the designing requirement to it is more simple and convenient to make the design and construction, and material saving, thereby reduces the engineering cost.

To sum up, the utility model discloses can reduce the pile bolck displacement, increase the excavation degree of depth, reduce the foundation ditch and overturn the destruction possibility, can reduce the foundation ditch supporting engineering of fender pile design intensity in order to reduce the cost.

Drawings

Fig. 1 is the utility model discloses a combined supporting structure's of slope bamboo joint stake and vertical tubular pile schematic diagram.

In the figure: 1-a crown beam; 2-foundation pit bottom; 3-the edge of the foundation pit; 4-bamboo joint pile A; 5-bamboo joint pile B; 6-annular protrusion.

Fig. 2 is the utility model discloses a section schematic diagram of the combined supporting structure of slope bamboo joint stake and vertical tubular pile.

In the figure: h₁-excavation depth of the foundation pit; h₂The length of the bamboo joint pile B; and the theta-bamboo joint pile has an inclination angle A.

Detailed Description

For further understanding of the contents, features and functions of the present invention, the following embodiments are enumerated in conjunction with the 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 bamboo joint piles comprises bamboo joint piles a4 arranged obliquely to a horizontal plane and bamboo joint piles B5 arranged perpendicularly to the horizontal plane, wherein the bamboo joint piles a4 and the bamboo joint piles B5 are alternately arranged to form a row pile supporting structure; the bamboo joint pile A4 and the bamboo joint pile B5 are arranged along the inner side of the edge 3 of a foundation pit, and crown beams 1 are arranged on the pile tops of the bamboo joint pile A4 and the bamboo joint pile B5; the lower part of the bamboo joint pile A4 inclines towards the inside of a foundation pit, the outer surfaces of the pile bodies of the bamboo joint pile A4 and the bamboo joint pile B5 are respectively provided with a plurality of annular bulges 6 vertical to the axis, and annular reinforcing ribs are arranged in the annular bulges 6; the connecting line of the pile top centers of the bamboo joint piles A4 is parallel to or coincided with the connecting line of the pile top centers of the bamboo joint piles B5. The bamboo joint pile A4 and the bamboo joint pile B5 are connected through the crown beam 1 to form a whole. 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 protrusion 6 may be formed by a common bottom surface of an upper conical surface and a lower conical surface, and the taper of the upper conical surface is greater than that of the lower conical surface.

The distance between the annular protrusions 6 of the bamboo joint piles A4 or B5 in the axial direction may be equal or unequal, and when the distance is not equal, the distance between the annular protrusions 6 of the bamboo joint piles A4 or B5 in the axial direction may gradually decrease.

The center connecting line of the pile tops of the bamboo joint piles A4 can be positioned on the inner side of the center connecting line of the pile tops of the bamboo joint piles B5; the distance between adjacent bamboo joint piles A4 and B5 can be 2-4 times of the pile diameter of the bamboo joint pile A4 or 2-4 times of the pile diameter of the bamboo joint pile B5.

The inclination angle of the axis of the bamboo joint pile A4 relative to the axis of the bamboo joint pile B5 is larger than 0 degree, the inclination angle is in the range of 0-30.5 degrees, and the included angle between the axis of the bamboo joint pile A4 and the axis of the bamboo joint pile B5 is preferably not larger than 30 degrees. As shown in fig. 2, an included angle between an axis of the bamboo joint pile a4 and an axis of the bamboo joint pile B5 is referred to as a bamboo joint pile a inclination angle θ, and the bamboo joint pile a inclination angle θ may be less than or equal to 30 °. The inclination angle theta of the bamboo joint pile A can be preferably 10 degrees, 12 degrees, 15 degrees, 18 degrees, 21 degrees and 24 degrees.

The pile bottom depth of the bamboo joint pile A4 or the bamboo joint pile B5 can be 2-2.5 times of the foundation pit excavation depth H₁. Namely, the height from the pile bottom end of the bamboo joint pile A4 or the bamboo joint pile B5 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 bamboo joint pile A4 or the bamboo joint pile B5 can be 300-600 mm; the height of the annular bulge 6 of the bamboo joint pile A4 or the bamboo joint pile B5 protruding out of the surface of the pile body can be 10% -30% of the pile diameter.

And arranging crown beams 1 on the bamboo joint piles A4 and B5. The width of the crown beam 1 may be greater than the pile top diameters of the bamboo joint piles A4 and B5 connected thereto, the width direction edge of the crown beam 1 may exceed the pile top edges of the bamboo joint piles A4 and B5, and the height of the crown beam 1 may be greater than or equal to 0.6 times of the pile diameter of the bamboo joint pile A4 or 0.6 times of the pile diameter of the bamboo joint pile B5.

Further, the dimension of the width direction edge of the crown beam 1 beyond the top edge of the bamboo pile a4 and the bamboo pile B5 on one side can be: the diameter of the bamboo joint pile A4 is 0.5 times of the diameter of the bamboo joint pile B5.

The length of the bamboo joint pile B5 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 B5 and is 0.2L away from the connecting line of the centers of the pile tops of the bamboo joint pile B5.

The utility model also provides a construction method of the combined supporting structure of slope bamboo joint stake and vertical bamboo joint stake, this method includes: prefabricating a bamboo joint pile A4 and a bamboo joint pile B5; the outer surfaces of the pile bodies of the bamboo joint pile A4 and the bamboo joint pile B5 are provided with a plurality of annular bulges 6 vertical to the axis, the intervals of the annular bulges 6 are equal or unequal, and annular reinforcing ribs are arranged in the annular bulges 6; bamboo joint piles A4 and B5 are arranged on the inner side of the edge 3 of the foundation pit on the site, and the bamboo joint piles A4 and B5 are alternately arranged to form a row pile supporting structure; the axis of the bamboo joint pile A4 is inclined to the horizontal plane, and the lower part of the bamboo joint pile A4 is inclined towards the inside of the foundation pit; the axis of the bamboo joint pile B5 is vertical to the horizontal plane; the center connecting line of the pile top of the bamboo joint pile A4 is parallel to or coincided with the center connecting line of the pile top of the bamboo joint pile B5, the bamboo joint pile A4 and the bamboo joint pile B5 both adopt a pile jumping construction method, and the next precast pile is pressed into the pile at intervals of 1-2 piles; and (3) prefabricating a crown beam 1 on the top ends of the bamboo joint piles A4 and B5. The center connecting line of the pile tops of the bamboo joint piles A4 can be positioned at the inner side of the center connecting line of the pile tops of the bamboo joint piles B5; the distance between adjacent bamboo joint piles A4 and B5 can be 2-4 times of the pile diameter of the bamboo joint pile A4 or 2-4 times of the pile diameter of the bamboo joint pile B5.

The construction sequence of laying the bamboo joint pile A4 and the bamboo joint pile B5 along the inner side of the edge of the foundation pit on site: when the pile center distance between two adjacent piles is less than or equal to 4 times of the pile diameter of the bamboo joint pile A4 or the bamboo joint pile B5, 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 pile center distance between two adjacent piles is larger than 4 times of the pile diameter of the bamboo joint pile A4 or the bamboo joint pile B5, the piles are sparse, and the driving sequence or the one-side single-direction driving mode can be adopted.

The length of the bamboo joint pile B5 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 B5 and is 0.2L away from the connecting line of the centers of the pile tops of the bamboo joint pile B5; 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.

The method for prefabricating the crown beam 1 on the pile top of the bamboo joint pile and the pile top of the bamboo joint pile can comprise the following steps of:

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 B5, removing the residual soil, then beginning to remove the pile head floating slurry to the designed elevation, roughening the concrete on the top surface of the pile core, removing the pile top floating slag, and if the strength of the pile head concrete at the designed elevation does not meet the design requirement, continuing to remove the concrete 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.

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.

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 method and operation principle of the present invention will be further described with reference to a preferred embodiment of the present invention:

referring to fig. 1, a combined supporting structure of inclined and vertical bamboo piles comprises a bamboo pile a4 arranged obliquely to a horizontal plane and a bamboo pile B5 arranged perpendicular to the horizontal plane, wherein the bamboo piles a4 and the bamboo piles B5 are alternately arranged to form a row pile supporting structure; the bamboo joint pile A4 and the bamboo joint pile B5 are arranged along the inner side of the edge 3 of a foundation pit, and crown beams 1 are arranged on the pile tops of the bamboo joint pile A4 and the bamboo joint pile B5; the lower part of the bamboo joint pile A4 inclines towards the inside of a foundation pit, the outer surfaces of the pile bodies of the bamboo joint pile A4 and the bamboo joint pile B5 are respectively provided with a plurality of annular bulges 6 vertical to the axis, and annular reinforcing ribs are arranged in the annular bulges 6; the connecting line of the pile top centers of the bamboo joint piles A4 is parallel to or coincided with the connecting line of the pile top centers of the bamboo joint piles B5. The bamboo joint pile A4 and the bamboo joint pile B5 are connected through the crown beam 1 to form a whole.

The bamboo joint pile B5 is a vertical support pile, the bamboo joint pile A4 is an inward-inclined support pile, and all the bamboo joint piles A4 and the bamboo joint pile B5 are connected into a whole by the crown beam 1. 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 B5. The pile bottom elevation of the mixing pile of the waterproof curtain is the same as the pile bottom elevation of the bamboo joint pile B5.

The basic principle of the utility model is that:

the combined supporting structure is formed by alternately arranging the bamboo joint piles A4 and the bamboo joint piles B5, when the bamboo joint piles B5 are vertical supporting piles and the bamboo joint piles A4 are inward-inclined supporting piles, the combined supporting structure formed by alternately arranging the bamboo joint piles A4 and the bamboo joint piles B5 is also called an inclined-straight alternate supporting structure, and the bamboo joint piles A4 and the bamboo joint piles B5 are connected through the pile top crown beam 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 support pile adopts the bamboo joint pile A4 to support the foundation pit, the annular bulge 6 of the bamboo joint pile A4 increases the contact area of the bamboo joint pile A4 and the soil body, particularly the soil layer with the good bottom, can effectively increase the side friction resistance, increases the contact area of the support structure and the soil body, particularly the soil layer with the good bottom, and can effectively increase the side friction resistance, thereby increasing the oblique upward supporting force and further controlling the displacement of the foundation pit. When the vertical support pile adopts the bamboo joint pile B5 to support the foundation pit, the side friction resistance can be effectively increased due to the annular bulge 6 of the bamboo joint pile B5, so that the tension of the vertical pile is increased, and the displacement of the foundation pit is further controlled.

The utility model discloses can effectively exert bearing diagonal power, consequently can reduce the inclination of interior slope fender pile, shorten the stake length of each fender pile, for example can reduce the long H of bamboo joint stake B stake₂And the pile length of the bamboo joint pile A4. The pile spacing of the supporting piles is increased, and the pile diameter of the supporting piles is reduced. 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 utility model discloses only be suitable for cantilever pile supporting mode. The utility model discloses recommend inclination that the interior inclination props up the fender pile promptly bamboo joint stake A4 and is greater than 0 and less than or equal to 30.5 degrees; the pile bottom depth of the bamboo joint pile A4 and the bamboo joint pile B5 is 2-2.5 times of the excavation depth H of the foundation pit₁(ii) a The distance between adjacent bamboo joint piles A4 and B5 is 2-2.5 times of the pile diameter. The pile diameter of the bamboo joint pile A4 or B5 can be 300-600 mm; the height of the annular bulge 6 of the bamboo joint pile A4 or the bamboo joint pile B5 protruding out of the surface of the pile body can be 10-30% 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 bamboo joint pile A4 and a bamboo joint pile B5; the outer surfaces of the pile bodies of the bamboo joint pile A4 and the bamboo joint pile B5 are provided with a plurality of annular bulges 6 vertical to the axis, the intervals of the annular bulges 6 are equal, and annular reinforcing ribs are arranged in the annular bulges 6; bamboo joint piles A4 and B5 are arranged on the inner side of the edge 3 of the foundation pit on the site, and the bamboo joint piles A4 and B5 are alternately arranged to form a row pile supporting structure; the axis of the bamboo joint pile A4 is inclined to the horizontal plane, and the lower part of the bamboo joint pile A4 is inclined towards the inside of the foundation pit; the axis of the bamboo joint pile B5 is vertical to the horizontal plane; the center connecting line of the pile top of the bamboo joint pile A4 is parallel to or coincided with the center connecting line of the pile top of the bamboo joint pile B5, the bamboo joint pile A4 and the bamboo joint pile B5 both adopt a pile jumping construction method, and the next precast pile is pressed into the pile at intervals of 1-2 piles; and (3) prefabricating the crown beam 1 on the pile tops of the bamboo joint pile A4 and the bamboo joint pile B5.

The construction method of the bamboo joint pile A4 and the bamboo joint pile B5 can be as follows:

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 B5 as L, and setting 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 B5 and is 0.2L away from the connecting line of the pile top centers of the bamboo joint pile B5; the pile bottom elevation of the mixing pile of the waterproof curtain is the same as the pile bottom elevation of the bamboo joint pile B5.

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.

And the crown beam 1 is arranged above the bamboo joint pile A4 and the bamboo joint pile B5. It is recommended that the width of the crown beam 1 is greater than the pile diameter of the top of the bamboo joint pile A4 and the bamboo joint pile B5 connected with the crown beam, and the height of the crown beam 1 can be greater than or equal to 0.6 time of the pile diameter of the bamboo joint pile A4 or 0.6 time of the pile diameter of the bamboo joint pile B5. The two sides of the crown beam 1 in the width direction are respectively expanded with the pile diameter of 1/2 bamboo joint pile A4 or the pile diameter of 1/2 bamboo joint pile B5.

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 used 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 implement the present invention accordingly, the scope of the present invention should not be limited by the embodiment, that is, all equivalent changes or modifications made by the spirit of the present invention should still fall within the scope of the present invention.

Claims (10)

1. A combined supporting structure of inclined bamboo joint piles and vertical bamboo joint piles is characterized by comprising bamboo joint piles A arranged obliquely to a horizontal plane and bamboo joint piles B arranged perpendicular to the horizontal plane, wherein the bamboo joint piles A and the bamboo joint piles B are alternately arranged to form a row pile supporting structure; the bamboo joint pile A and the bamboo joint pile B are arranged along the inner side of the edge of the foundation pit, and crown beams are arranged on the pile tops of the bamboo joint pile A and the bamboo joint pile B; the lower part of the bamboo joint pile A inclines towards the inside of a foundation pit, the outer surfaces of pile bodies of the bamboo joint pile A and the bamboo joint pile B are respectively provided with a plurality of annular bulges vertical to the axis, and annular reinforcing ribs are arranged in the annular bulges; and the pile top central connecting line of the bamboo joint pile A is parallel to or coincided with the pile top central connecting line of the bamboo joint pile B.

2. The combined supporting structure of the inclined bamboo joint pile and the vertical bamboo joint pile according to claim 1, wherein an included angle between an axis of the bamboo joint pile A and an axis of the bamboo joint pile B is not more than 30 degrees.

3. The combined supporting structure of the inclined bamboo joint pile and the vertical bamboo joint pile according to claim 1, wherein the pile bottom depth of the bamboo joint pile A or the bamboo joint pile B 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 bamboo joint piles as claimed in claim 1, wherein the annular protrusions of the bamboo joint pile A or the bamboo joint pile B are gradually reduced in distance along the axial direction.

5. The combined supporting structure of the inclined bamboo joint pile and the vertical bamboo joint pile according to claim 1, wherein the pile diameter of the bamboo joint pile A or the bamboo joint pile B is 300-600 mm; the height of the annular bulge of the bamboo joint pile A or the bamboo joint pile B protruding 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 bamboo joint pile according to claim 1, wherein the width direction edge of the crown beam exceeds the pile top edges of the bamboo joint pile A and the bamboo joint pile B, and the height of the crown beam is greater than or equal to 0.6 times of the pile diameter of the bamboo joint pile A or the bamboo joint pile B.

7. The combined supporting structure of the inclined and vertical bamboo joint piles according to claim 6, wherein the width-direction edges of the crown beams exceed the top edges of the bamboo joint piles A and B by the following dimensions: the diameter of the bamboo joint pile A or the bamboo joint pile B is 0.5 times of the diameter of the bamboo joint pile A or the bamboo joint pile B.

8. The combined supporting structure of inclined and vertical bamboo joint piles according to claim 1, wherein the length of the bamboo joint pile B is set to be L, and a cement mixing pile waterproof curtain is arranged at a position which is outside the connecting line of the centers of the pile tops of the bamboo joint pile B and is 0.2L away from the connecting line of the centers of the pile tops of the bamboo joint pile B.

9. The combined supporting structure of the inclined bamboo joint pile and the vertical bamboo joint pile according to claim 1, wherein the annular protrusion is formed by the common bottom surface of an upper conical surface and a lower conical surface, and the taper of the upper conical surface is greater than that of the lower conical surface.

10. The combined supporting structure of the inclined and vertical bamboo joint piles according to claim 1, wherein the annular reinforcing ribs comprise a plurality of radial reinforcing bars which are radially distributed and a plurality of concentric annular reinforcing bars which are connected with the radial reinforcing bars.

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