CN116335124A - Friction pile and construction method thereof - Google Patents

Abstract

The invention provides a friction pile which comprises a pile pier and a prefabricated seat which are sequentially arranged in a pile hole from bottom to top, wherein the prefabricated seat comprises a seat body with an installation groove arranged inside, a column inlet hole communicated with the installation groove is formed in the top surface of the seat body, a plurality of guide sliding grooves are formed in the wall of the installation groove, a lock column chuck is slidably arranged in each guide sliding groove, and a lock column mechanism is arranged in the installation groove. This friction pile is through setting up the prefabricated seat that links to each other with the precast column assembly type and locks the precast column on the stake mound, has not only promoted the efficiency of construction between this friction pile and the precast column, has still increased the joint strength between this friction pile and the precast column.

Description

Friction pile and construction method thereof

Technical Field

The invention relates to the technical field of pile foundation construction, in particular to a friction pile and a construction method thereof.

Background

Friction piles are piles with pile bottoms in soft soil layers, axial loads of the piles are supported by pile side friction resistance and pile bottom soil counterforces, and pile side friction forces play a main supporting role and are mainly used for stratum embedding in very deep foundations. In the state of extreme bearing capacity, the pile top load of the friction pile is borne by pile side resistance, and the load borne by the pile tip part is very small and is generally not more than 10%, for example, when the friction pile is driven in a saturated soft clay foundation, no hard pile tip bearing layer exists in the depth of tens of meters.

In recent years, with the continuous development of the building-in-building industry, the application of the building-in-building is becoming more and more widespread, wherein the building-in-building mainly comprises prefabricated building-in-concrete structures, steel structures, wood structures and the like, which are constructed by transferring a lot of field work in the conventional construction manner to factories, processing building members and fittings at the factories, transporting to the building construction site, and then assembling and installing the building in the field by a reliable connection manner. The assembled bridge structure has the advantages of accelerating construction speed, reducing influence on environmental traffic and the like, and is widely applied, and comprises piles, prefabricated columns and capping beams which are sequentially arranged from bottom to top.

At present, the construction method of the pile mainly comprises the following steps: and (3) mechanically or manually driving a pile hole on a pile position of a construction site, then putting a reinforcement cage into the pile hole, then pouring concrete into the pile hole, and completing construction after the concrete of the pile structure is hardened. The vertical main reinforcement of the reinforcement cage protrudes out of the surface of the pile, and the protruding vertical main reinforcement serves as a reserved reinforcement for connecting with the prefabricated column.

The chinese patent of current application publication No. CN113914199a discloses a prefabricated hollow pier of grout sleeve connection and construction method thereof, including the pier body, set up in the reinforcement cage of pier body, reinforcement cage includes a plurality of vertical outer main muscle of wearing to locate in the pier body, the tip of every outer main muscle all is provided with the grout sleeve that is used for connecting cushion cap (the upper portion component of stake), the grout sleeve is last to run through and to set up and to be used for supplying outer main muscle and cushion cap (the upper portion component of stake) pre-buried to assemble end reinforcing bar male reinforcing bar and advance the post hole, grout sleeve has in the grout sleeve with reinforcing bar advance the post hole intercommunication thick liquids chamber, be provided with the grout pipe of import and pier body lateral wall parallel and level and with thick liquids chamber intercommunication, the export is with pier body lateral wall parallel and level and with thick liquids chamber intercommunication play thick liquids pipe. This prefabricated hollow mound is through predetermining the grout sleeve in the pier body, utilizes the grouting material in the grout sleeve to link together the outer main muscle in the pier body and the pre-buried concatenation end reinforcing bar of cushion cap (the upper portion component of stake), is favorable to promoting the joint strength between prefabricated hollow mound and the cushion cap (the upper portion component of stake). The prior art solutions described above have the following drawbacks: the pile and the prefabricated column are connected by adopting a grouting sleeve and cement mortar paved on the butt joint surface, and the problem of low construction efficiency exists between the pile and the prefabricated column.

Disclosure of Invention

The invention aims to solve the problems of the prior art and provides a friction pile and a construction method thereof, which solve the problem of low construction efficiency in the prior art.

The above object of the present invention is achieved by the following technical solutions: the utility model provides a friction pile, includes pile pier, the prefabricated seat that sets gradually in the stake downthehole from bottom to top, the prefabricated seat is including the pedestal that the mounting groove was seted up to inside, set up the business turn over post hole with the mounting groove intercommunication on the top surface of pedestal, set up a plurality of guide runners on the cell wall of mounting groove, every all slide in the guide runner and be provided with lock post chuck, be provided with lock post mechanism in the mounting groove.

The invention is further provided with: the side wall of the installation groove is provided with a movable groove which is positioned below the guide chute and communicated with the guide chute, one end of the outer side wall of the lock cylinder clamp head, which is far away from the center of the installation groove, is fixedly connected with a hinge seat, the bottom surface of the hinge seat is provided with an upper hinge groove, the lock cylinder mechanism comprises a movable disc and a linkage rod, the movable disc is arranged in the installation groove in a sliding way, the movable disc is located one side of the lock column clamp head far away from the column inlet hole, a plurality of lower hinge grooves are formed in the outer side wall of the movable disc, one end of the linkage rod stretches into the lower hinge grooves and is hinged to the movable disc, the other end of the linkage rod stretches into the upper hinge grooves and is hinged to the hinge seat, and the hinge point of the linkage rod and the movable disc is located below the hinge point of the linkage rod and the hinge seat.

The invention is further provided with: the end face of the movable disc, which faces the column inlet hole, is provided with a column inserting hole which is in plug-in fit with the column.

The invention is further provided with: the movable disc is provided with a spring sleeving rod on the end face deviating from the plunger hole, one end of the spring sleeving rod is propped against the end face deviating from the plunger hole of the movable disc, and the other end of the spring sleeving rod is propped against the bottom wall of the mounting groove.

The invention is further provided with: pile pier includes the pier body, sets up in the internal steel reinforcement cage of pier, the steel reinforcement cage includes that the top stretches out the pier body stand, sets up in the inboard strengthening rib of stand, spiral set up in the spiral stirrup in the stand outside, set up the slip casting chamber that is located pier body top surface top on the bottom surface of pedestal, set up a plurality of and stand alignment and with slip casting chamber intercommunication's dowel hole on the top surface of pedestal, the diameter of dowel hole is greater than the diameter of stand, dowel hole and slip casting intracavity packing have concrete.

The invention is further provided with: the top surface of the pier body is provided with a positioning ring groove, and the bottom surface of the base body is provided with a positioning convex ring which is in plug-in fit with the positioning ring groove.

The invention also discloses a construction method of the friction pile, which comprises the following steps:

step 1: preparing construction;

step 2: burying a steel pile casing;

step 3: excavating a slurry pool;

step 4: digging a pile hole;

step 5: hoisting a reinforcement cage;

step 6: pouring a formed pile pier;

step 7: pulling out the steel pile casing;

step 8: detecting pile pier quality;

step 9: and (5) hoisting the prefabricated seat.

The invention is further provided with: the step 1 further comprises the following steps:

step 1.1, field cleaning: before the drilling machine is in place, removing silt and quicksand on the original ground, leveling the whole field, tamping the whole field to be used as a construction operation platform of the drilling machine, ensuring that the field has certain hardness so as to prevent the drilling machine from sinking or tilting, and paving 30cm thick rubble on the surface and leveling and rolling if the field is thicker in soft soil and insufficient in hardness;

step 1.2, measuring and lofting: and (5) measuring and paying off, drawing out a route center line and each pile center line, and determining the accurate position of the hole site.

The invention is further provided with: the step 4 further comprises the following steps:

step 4.1, positioning a drilling machine: leveling and tamping are carried out in advance at the installation position of the drilling machine so as to prevent the drilling machine from tilting and sinking to influence the quality of hole forming in the drilling process, the drilling machine is installed in place by a crane, pile protection points are led to the wall of the hole protection cylinder by a measuring instrument to form a crisscross for positioning a main rope of the drilling machine, and the positioning deviation of the drilling machine is smaller than 50mm;

step 4.2, drilling: before drilling, adding clay into the steel pile casing, when the earth surface soil layer is loose, adding small stones, injecting mud and clear water, extruding mud paste and stones to the hole wall by means of the impact of a drill bit, checking the rebound condition of a main rope of the drilling machine at any time during drilling, and hearing the impact sound of a drill bit to distinguish the condition of the hole bottom, wherein the mud level in the hole is required to be higher than the pile casing feet by more than 0.5m so as to prevent the mud surface from swaying and damaging the hole wall of the pile casing feet, but is lower than the top surface of the pile casing by 0.3m, so that the mud is prevented from overflowing, and the abrasion condition of the steel wire rope and the drill bit is checked in the impact process;

step 4.3, hole cleaning: firstly, checking the aperture, the perpendicularity of the hole and the depth of the hole by using a hole checking device, and immediately cleaning the hole after the drilling reaches the design depth and the pore forming quality meets the drawing requirements, cleaning the mud attached to the pile casing, and cleaning the sediment of the drilling slag and the mud sand at the bottom of the hole, thereby ensuring that the sediment thickness of the drilling slag at the bottom of the hole after cleaning the hole meets the design specification and specification requirements.

The invention is further provided with: in the step 9, the lifting vehicle lifts the base body to the position right above the pile pier, and makes the positioning convex ring align with the positioning ring groove, the dowel holes align with the grain diameter, then the base body is lowered until the positioning convex ring is inserted into the positioning ring groove, the studs are inserted into the dowel holes, then the high-pressure grouting device is connected to the orifice of one dowel hole, the orifice of the other dowel holes is plugged, then the grouting is performed to the dowel holes by the high-pressure grouting device, after the grouting cavity and all dowel holes are filled with concrete mortar, grouting is stopped, and after the concrete mortar is hardened, the installation work of the prefabricated base is completed.

In summary, the beneficial technical effects of the invention are as follows: this friction pile is through setting up the prefabricated seat that links to each other with the precast column assembly type and locks the precast column on the stake mound, has not only promoted the efficiency of construction between this friction pile and the precast column, has still increased the joint strength between this friction pile and the precast column.

Drawings

FIG. 1 is a schematic cross-sectional view of a friction pile according to the present invention;

FIG. 2 is a schematic cross-sectional view of the pile pier of the present invention;

FIG. 3 is a schematic cross-sectional view of a preform seat according to the present invention;

fig. 4 is a schematic view of the structure of the cylinder lock head and the cylinder lock mechanism in the present invention.

In the above figures: 1. pile pier; 2. a pier body; 21. positioning ring grooves; 3. a reinforcement cage; 31. a vertical rib; 32. reinforcing ribs; 33. spiral stirrups; 4. prefabricating a seat; 5. a base; 6. positioning the convex ring; 7. grouting cavity; 8. dowel holes; 9. a mounting groove; 10. a column inlet hole; 11. a guide chute; 12. a movable groove; 13. a lock cylinder chuck; 14. a hinge base; 15. an upper hinge groove; 16. a movable plate; 17. a post insertion hole; 18. a lower hinge groove; 19. a linkage rod; 20. a spring rod; 22. a top plate spring; 23. a column; 24. and a lock cylinder ring groove.

Description of the embodiments

The invention will be further described with reference to the drawings and detailed description in order to make the technical means, the creation characteristics, the achievement of the objects and the functions of the invention more clear and easy to understand.

As shown in fig. 1, the invention provides a friction pile, which comprises a pile pier 1 and a prefabricated seat 4 which are sequentially arranged in a pile hole from bottom to top, wherein the pile pier 1 is constructed in a cast-in-situ mode, and the prefabricated seat 4 is a prefabricated component.

As shown in fig. 1 and 2, the pile pier 1 comprises a pier body 2 and a reinforcement cage 3 arranged in the pier body 2. The pier body 2 is formed by concrete pouring, and a positioning ring groove 21 is formed in the top surface of the pier body 2, and the cross section of the positioning ring groove 21 is circular. The steel reinforcement cage 3 includes the stud 31, the strengthening rib 32, spiral stirrup 33, the stud 31 is vertical setting, many studs 31 are equidistant circumference and distribute, the strengthening rib 32 sets up along the length direction interval of stud 31, the strengthening rib 32 is the ring form, the strengthening rib 32 sets up in the stud 31 inboard that the round set up, pass through welded fastening between strengthening rib 32 and the stud 31, spiral stirrup 33 is heliciform, spiral stirrup 33 spiral winding is in the outside of stud 31, pass through welded fastening between spiral stirrup 33 and the stud 31. At present, the reinforcement cage 3 is usually prefabricated according to a design drawing.

As shown in fig. 1 and 3, the prefabricated seat 4 comprises a cylindrical seat body 5, a positioning convex ring 6 is integrally connected to the bottom surface of the seat body 5, the cross section of the positioning convex ring 6 is circular, and the positioning convex ring 6 is in plug-in fit with the positioning annular groove 21. The grouting cavity 7 is formed in the bottom surface of the base body 5, the cross section of the grouting cavity 7 is circular, a plurality of circular dowel holes 8 are formed in the top surface of the base body 5, the diameter of each dowel hole 8 is larger than that of each stud 31, the number of the dowel holes 8 is consistent with that of the studs 31, and the dowel holes 8 are aligned with the studs 31 one by one.

When the prefabricated seat 4 is installed on the pile pier 1, a crane is used for lifting the seat body 5 to the position right above the pile pier 1, the positioning convex ring 6 is aligned with the positioning annular groove 21, the dowel holes 8 are aligned with the grain sizes, then the seat body 5 is lowered until the positioning convex ring 6 is inserted into the positioning annular groove 21, the studs 31 are inserted into the dowel holes 8, then a high-pressure grouting device is connected to the orifice of one dowel hole 8, orifices of other dowel holes 8 are plugged, then grouting is carried out in the dowel holes 8 by using the high-pressure grouting device until the grouting cavity 7 and all dowel holes 8 are filled with concrete mortar, grouting is stopped, and after the concrete mortar is hardened, the installation work of the prefabricated seat 4 is completed.

As shown in fig. 1 and 3, a mounting groove 9 is formed in the base 5, the cross section of the mounting groove 9 is circular, and the mounting groove 9 is located at the center of the base 5. The top surface of the seat body 5 is provided with a column inlet hole 10, the column inlet hole 10 is a round hole, and the column inlet hole 10 is communicated with the mounting groove 9. Two guide sliding grooves 11 are symmetrically formed in the groove wall of the mounting groove 9, and the cross section of each guide sliding groove 11 is circular. Two movable grooves 12 are symmetrically formed in the groove wall of the mounting groove 9, the cross section of each movable groove 12 is trapezoidal, the two movable grooves 12 are respectively located below the two guide sliding grooves 11, and the movable grooves 12 are communicated with the guide sliding grooves 11. Each guide chute 11 is internally provided with a lock column clamping head 13 in a sliding manner, the end part, close to the mounting groove 9, of the lock column clamping head 13 is hemispherical, one end, far away from the mounting groove 9, of the outer side wall of the lock column clamping head 13 is fixedly connected with a hinge seat 14, and an upper hinge groove 15 is formed in the bottom surface of the hinge seat 14.

As shown in fig. 3 and 4, a lock cylinder mechanism is arranged in the mounting groove 9, and the lock cylinder mechanism is used for controlling the lock cylinder clamping head 13 to do reciprocating linear motion along the guide chute 11, and comprises a movable disc 16 and a linkage rod 19.

As shown in fig. 3 and 4, the movable disc 16 is disc-shaped, the movable disc 16 is in sliding fit with the mounting groove 9, the movable disc 16 can relatively stably reciprocate in the mounting groove 9, the movable disc 16 is located at one side of the lock cylinder clamp 13 away from the cylinder inlet hole 10, the end face of the movable disc 16 facing the cylinder inlet hole 10 is provided with a cylinder inserting hole 17, and the outer side wall of the movable disc 16 is symmetrically provided with two lower hinge grooves 18.

As shown in fig. 3 and 4, the linkage rod 19 is located in the movable groove 12, one end of the linkage rod 19 extends into the upper hinge groove 15 and is hinged with the hinge seat 14 through a pin shaft, the other end extends into the lower hinge groove 18 and is hinged with the movable disc 16 through a pin shaft, and the hinge point of the linkage rod 19 and the movable disc 16 is located below the hinge point of the linkage rod 19 and the hinge seat 14.

As shown in fig. 3 and 4, a spring rod 20 is fixedly connected to the end surface of the movable disk 16 facing away from the plunger hole 17, the spring rod 20 is cylindrical, and the spring rod 20 and the movable disk 16 are coaxially arranged. The spring rod 20 is sleeved with a top disc spring 22, one end of the top disc spring 22 abuts against the end face of the movable disc 16, which is far away from the column inlet hole 10, the other end of the top disc spring 22 abuts against the bottom wall of the mounting groove 9, and the top disc spring 22 is used for pushing the movable disc 16 to move towards the direction, which is close to the column inlet hole 10.

The invention also discloses a prefabricated column which is the upper structure of the friction pile, the prefabricated column comprises a cylindrical column body 23, the column body 23 is in sliding fit with the column inlet hole 10, the column body 23 is in plug fit with the column inserting hole 17, a column locking ring groove 24 is formed in the circumferential direction of the bottom of the outer side wall of the column body 23, and the cross section of the column locking ring groove 24 is hemispherical.

When the prefabricated column is mounted on the friction pile, the crane lifts the prefabricated column to the position right above the friction pile, the prefabricated column is aligned to the column inlet hole 10, then the prefabricated column is lowered, the prefabricated column passes through the column inlet hole 10 and then is inserted into the column inserting hole 17 of the movable disc 16, the prefabricated column can push the movable disc 16 to move downwards until the bottom surface of the sleeve reed pipe abuts against the bottom wall of the mounting groove 9, in the process, as the hinging point of the linkage rod 19 and the movable disc 16 is positioned below the hinging point of the linkage rod 19 and the hinging seat 14, when the movable disc 16 moves downwards, the two lock column clamping heads 13 are driven by the linkage rod 19 to move along the guide sliding groove 11 to a direction close to the center of the mounting groove 9 until the end part of the lock column clamping head 13 close to the mounting groove 9 is inserted into the lock column ring groove 24 of the prefabricated column, and at the moment, the prefabricated column is limited to be separated from the prefabricated seat 4.

This friction pile is through setting up on stake mound 1 with prefabricated post assembled continuous and with the prefabricated seat 4 of prefabricated post locking, not only promoted the efficiency of construction between this friction pile and the prefabricated post, still increased the joint strength between this friction pile and the prefabricated post.

A construction method of a friction pile, the construction method comprising the steps of:

step 1: and (5) preparing construction.

Step 1.1: and (5) cleaning the field.

In the step 1.1, before the drilling machine is in place, the silt and the quicksand on the original ground are removed, the whole field is leveled and compacted to be a construction operation platform of the drilling machine, and the field is ensured to have certain hardness so as to prevent the drilling machine from sinking or tilting. If the field soft soil is thicker and the hardness is insufficient, paving 30cm thick rubble on the surface and flattening and rolling the rubble, so that the safety of the construction operation of the drilling machine is ensured.

Step 1.2: and (5) measuring and lofting.

In the step 1.2, measuring and paying off, drawing out a route center line and each pile center line, and determining the accurate position of the hole site.

Step 2: and burying a steel pile casing.

In the step 2, the steel casing is rolled by delta=6mm-8mm steel plates in a factory, and 10mm thick steel plates are added to the range of 0.6m at the upper end and the lower end of the casing to serve as external stiffening hoops so as to prevent the steel casing from deforming. The pile casing is processed into 3m or 5m long sections, and two ends of each section of pile casing are fixed by cross supports, so that deformation during lifting and transportation is prevented.

In the step 2, when the steel pile casing is buried, firstly, a foundation pit with the depth of 1m is dug at a hole site, then the steel pile casing is hung above the hole site by using a vibrating hammer, then the steel pile casing is vibrated and pressed into a soil foundation by using the vibrating hammer, the center vertical line of the steel pile casing is ensured to coincide with the center line of a pile, the allowable deviation of the plane position is 50mm, the inclination is not more than 1%, the top surface of the steel pile casing is 0.3m higher than the ground (1.0-2.0 m higher than the water surface), high-quality clay is filled and tamped in the foundation pit in a layered manner, the periphery of the steel pile casing is surrounded by the high-quality clay, and the purpose of filling the high-quality clay is to keep the steel pile casing stable by using the clay pressure and the water-proof function, and the pile position is checked and accurately controlled by using a total station after the steel pile casing is installed.

Step 3: and excavating a mud pit.

In the step 3, before the foundation pit is excavated, the engineering department technicians measure and position the mud pit according to the design position, the excavation line of the mud pit is determined, the lime line is sprayed out, the excavation range of the mud pit is confirmed according to measurement lofting, the mud pit is excavated, the mud pit must comprise a separated mud storage pit and a sedimentation pit, a groove for mud to flow is excavated between the sedimentation pit and a pile hole steel pile casing mud port, the width is not more than 1m, the depth is not more than 50cm, the groove is protected by adopting a mould, the soil at the edge of the groove is prevented from slumping, the mud with drilling slag flowing out during drilling is discharged to the sedimentation pit, the mud is initially deposited by the sedimentation pit and flows into the mud storage pit for a mud pump, a steel pipe guard rail is arranged at the periphery of the mud pit, the guard rail is provided with a green dense mesh net for sealing, and a safety warning board is arranged.

Step 4: and excavating pile holes.

Step 4.1, positioning a drilling machine: the drilling machine installation place is flattened and tamped in advance, so that the drilling machine is prevented from tilting and sinking to influence the quality of hole forming in the drilling process, the drilling machine is installed in place by a crane, pile protection points are led to the wall of the hole protection cylinder by a measuring instrument to form a crisscross for positioning a main rope of the drilling machine, the positioning deviation of the drilling machine is smaller than 50mm, the drilling machine adopts a cross hammer, and the edge and the bottom outlet are overlaid by rail steel or wear-resistant welding blocks.

Step 4.2, drilling: before drilling, adding clay into the steel pile casing, adding small stones when the earth surface soil layer loosens, injecting mud and clear water, extruding mud paste and stones to the hole wall by means of the impact of a drill bit, checking the rebound condition of a main rope of the drilling machine at any time during drilling, and hearing the impact sound of a drill bit to distinguish the condition of the hole bottom, wherein the mud level in the hole is required to be higher than the pile casing feet by more than 0.5m so as to prevent the mud surface from swaying and damaging the hole wall of the pile casing feet, but is lower than the top surface of the pile casing by 0.3m, so that the mud is prevented from overflowing, the abrasion condition of the steel wire rope and the drill bit is checked in the impact process, and the occurrence of safety quality accidents is prevented.

Step 4.3, hole cleaning: firstly, checking the aperture, the perpendicularity of the hole and the depth of the hole by using a hole checking device, and immediately cleaning the hole after the drilling reaches the design depth and the pore forming quality meets the drawing requirements, cleaning the mud attached to the pile casing, and cleaning the sediment of the drilling slag and the mud sand at the bottom of the hole, thereby ensuring that the sediment thickness of the drilling slag at the bottom of the hole after cleaning the hole meets the design specification and specification requirements.

Step 5: hoisting the reinforcement cage 3.

In the step 5, the reinforcement cage 3 is prefabricated in a factory according to a preset drawing, transported to a construction site through a transport vehicle, and lifted by a multi-point lifting method and placed into a pile hole.

Step 6: and pouring the formed pile pier 1.

In the step 6, the pile pier 1 is poured by adopting a vertical-lift conduit method, the conduit is carefully checked for specification, quality and splicing structure before and after being used for a period of time, splicing and hydrostatic test are also required, the test water pressure is not less than 1.3 times of the maximum pressure which the conduit can bear when pouring concrete, the conduit rolls for several times through the test of 5 minutes, the conduit wall is not deformed, the joint is watertight, the method is considered to be qualified, and then the section-by-section number is marked on the outer wall of the conduit by using obvious marks and the scale is marked. The underwater concrete is poured continuously, so that the shutdown is avoided, the descending of the concrete in the pipe and the lifting of the water level in the hole are observed in the pouring process, the top surface height of the concrete in the hole is measured in time, the lifting and the dismantling of the guide pipe are properly commanded, the embedding depth of the guide pipe is ensured to be not less than 2m and not more than 6m, and water cannot enter.

Step 7: and (5) pulling out the steel casing.

In the step 7, the steel casing can be pulled out by adopting an air pressure jacking method and a vibration hammer pulling method.

Step 8: and detecting the quality of the pile pier 1.

In the step 8, the quality detection of the pile pier 1 means that the core sample strength and the crushing degree of the pile pier 1 are detected by using technical means such as scattering, sound detection and vibration excitation.

Step 9: and hoisting the prefabricated seat 4.

In the step 9, the crane lifts the seat body 5 to the position right above the pile pier 1, and makes the positioning convex ring 6 aligned with the positioning ring groove 21, the dowel holes 8 aligned with the grain size, then lowers the seat body 5 until the positioning convex ring 6 is inserted into the positioning ring groove 21, the studs 31 are inserted into the dowel holes 8, then connects with the high-pressure grouting device at the orifice of one dowel hole 8, plugs the orifice of the other dowel hole 8, and then utilizes the high-pressure grouting device to grouting into the dowel hole 8, and after the grouting cavity 7 and all dowel holes 8 are filled with concrete mortar, the grouting is stopped, and after the concrete mortar is hardened, the installation work of the prefabricated seat 4 is completed.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.

Claims (10)

1. A friction pile, characterized in that: including pile pier (1), prefabricated seat (4) that set gradually in the stake hole from bottom to top, prefabricated seat (4) are including inside pedestal (5) of seting up mounting groove (9), set up on the top surface of pedestal (5) with mounting groove (9) intercommunication advance post hole (10), a plurality of direction spouts (11) have been seted up on the cell wall of mounting groove (9), every all slide in direction spout (11) and be provided with lock post chuck (13), be provided with lock post mechanism in mounting groove (9).

2. A friction pile according to claim 1, characterised in that: the utility model provides a lock post chuck, including installation groove (9) and lock post chuck, set up on the lateral wall of installation groove (9) be located direction spout (11) below and with movable groove (12) of direction spout (11) intercommunication, one end fixedly connected with hinge seat (14) at installation groove (9) center is kept away from to lock post chuck (13) lateral wall, last hinge groove (15) have been seted up on the bottom surface of hinge seat (14), lock post mechanism includes movable dish (16), interlock pole (19), movable dish (16) slide set up in installation groove (9), movable dish (16) are located lock post chuck (13) and are kept away from one side of advancing post hole (10), a plurality of lower hinge grooves (18) have been seted up on the lateral wall of movable dish (16), articulated groove (18) and hinge with movable dish (16) down are stretched into to interlock pole (19) one end, the other end stretches into hinge groove (15) and hinge with hinge seat (14), the hinge point of interlock pole (19) and movable dish (16) is located the hinge point of interlock pole (19) and hinge point below with hinge seat (14).

3. A friction pile according to claim 2, characterised in that: the end face of the movable disc (16) facing the column inlet hole (10) is provided with a column inserting hole (17) which is in plug-in fit with the column (23).

4. A friction pile according to claim 2, characterised in that: the movable disc (16) is provided with a spring sleeving rod (20) on the end face deviating from the plunger hole (17), one end of the spring sleeving rod (20) is propped against the end face deviating from the plunger hole (10) of the movable disc (16), and the other end of the spring sleeving rod is propped against the bottom wall of the mounting groove (9) with a top disc spring (22).

5. A friction pile according to claim 2, characterised in that: pile pier (1) including pier body (2), set up steel reinforcement cage (3) in pier body (2), steel reinforcement cage (3) are including top stretches out upright muscle (31) of pier body (2), set up in upright muscle (32) of muscle (31) inboard, spiral set up spiral stirrup (33) in upright muscle (31) outside, set up grouting chamber (7) that are located pier body (2) top surface top on the bottom surface of pedestal (5), set up a plurality of dowel holes (8) that align and communicate with grouting chamber (7) with upright muscle (31) on the top surface of pedestal (5), the diameter of dowel hole (8) is greater than the diameter of upright muscle (31), dowel hole (8) and grouting chamber (7) intussuseption are filled with concrete.

6. A friction pile according to claim 5, characterised in that: the top surface of the pier body (2) is provided with a positioning ring groove (21), and the bottom surface of the seat body (5) is provided with a positioning convex ring (6) which is in plug-in fit with the positioning ring groove (21).

7. A construction method of a friction pile is characterized by comprising the following steps: the construction method comprises the following steps:

step 1: preparing construction;

step 2: burying a steel pile casing;

step 3: excavating a slurry pool;

step 4: digging a pile hole;

step 5: hoisting a reinforcement cage (3);

step 6: pouring the formed pile pier (1);

step 7: pulling out the steel pile casing;

step 8: detecting the quality of the pile pier (1);

step 9: and hoisting the prefabricated seat (4).

8. A friction pile according to claim 7, characterised in that: the step 1 further comprises the following steps:

step 1.1, field cleaning: before the drilling machine is in place, removing silt and quicksand on the original ground, leveling the whole field, tamping the whole field to be used as a construction operation platform of the drilling machine, ensuring that the field has certain hardness so as to prevent the drilling machine from sinking or tilting, and paving 30cm thick rubble on the surface and leveling and rolling if the field is thicker in soft soil and insufficient in hardness;

step 1.2, measuring and lofting: and (5) measuring and paying off, drawing out a route center line and each pile center line, and determining the accurate position of the hole site.

9. A friction pile according to claim 7, characterised in that: the step 4 further comprises the following steps:

step 4.1, positioning a drilling machine: leveling and tamping are carried out in advance at the installation position of the drilling machine so as to prevent the drilling machine from tilting and sinking to influence the quality of hole forming in the drilling process, the drilling machine is installed in place by a crane, pile protection points are led to the wall of the hole protection cylinder by a measuring instrument to form a crisscross for positioning a main rope of the drilling machine, and the positioning deviation of the drilling machine is smaller than 50mm;

step 4.2, drilling: before drilling, adding clay into the steel pile casing, when the earth surface soil layer is loose, adding small stones, injecting mud and clear water, extruding mud paste and stones to the hole wall by means of the impact of a drill bit, checking the rebound condition of a main rope of the drilling machine at any time during drilling, and hearing the impact sound of a drill bit to distinguish the condition of the hole bottom, wherein the mud level in the hole is required to be higher than the pile casing feet by more than 0.5m so as to prevent the mud surface from swaying and damaging the hole wall of the pile casing feet, but is lower than the top surface of the pile casing by 0.3m, so that the mud is prevented from overflowing, and the abrasion condition of the steel wire rope and the drill bit is checked in the impact process;

step 4.3, hole cleaning: firstly, checking the aperture, the perpendicularity of the hole and the depth of the hole by using a hole checking device, and immediately cleaning the hole after the drilling reaches the design depth and the pore forming quality meets the drawing requirements, cleaning the mud attached to the pile casing, and cleaning the sediment of the drilling slag and the mud sand at the bottom of the hole, thereby ensuring that the sediment thickness of the drilling slag at the bottom of the hole after cleaning the hole meets the design specification and specification requirements.

10. A friction pile according to claim 7, characterised in that: in the step 9, the lifting truck lifts the seat body (5) to the position right above the pile pier (1), the positioning convex ring (6) is aligned with the positioning annular groove (21), the dowel holes (8) are aligned with the grain size, then the seat body (5) is lowered until the positioning convex ring (6) is inserted into the positioning annular groove (21), the studs (31) are inserted into the dowel holes (8), then a high-pressure grouting device is connected to the orifice of one dowel hole (8), orifices of other dowel holes (8) are blocked, and then grouting is carried out into the dowel holes (8) by utilizing the high-pressure grouting device until the grouting cavity (7) and all dowel holes (8) are filled with concrete mortar, grouting is stopped, and after the concrete mortar is hardened, the installation work of the prefabricated seat (4) is completed.

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