A cast-in-place rock-socketed pile and a construction method thereof

Abstract

The application provides a rock-embedded pile, which comprises a pile foundation and a column base arranged in sequence from bottom to top, the column base comprises a pedestal arranged on the pile foundation, a column connecting hole is arranged on the top surface of the pedestal, a plurality of convex columns are arranged on the outer side wall of the pedestal, an outer sliding hole and an inner sliding hole are arranged in sequence on the end face of the convex column away from the pedestal and facing the pedestal, a lock column sliding rod is arranged in the inner sliding hole in a sliding mode, the end of the lock column sliding rod away from the mounting insertion hole is provided with a lock column sliding plate matched with the outer sliding hole in a sliding mode, and a push plate spring is arranged on the lock column sliding rod and abuts against the bottom of the outer sliding hole at one end and abuts against the lock column sliding plate at the other end. The rock-embedded pile and the prefabricated column are connected through the lock column sliding rod and the lock column insertion hole matched in a plug-in mode and the high-strength concrete mortar arranged on the abutting surface of the two, and the connecting strength between the rock-embedded pile and the prefabricated column is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pile foundation construction, in particular to a rock-socketed pile and a construction method thereof. BACKGROUND

[0002] The rock-socketed pile refers to a bored pile with a lower part poured into a hard rock layer for a certain length, and a lower end embedded into slightly weathered, moderately weathered or fresh bedrock. No matter the pile is embedded into weathered rock or fresh bedrock, the load of the pile body decreases with the depth, which shows that the side resistance of the overburden soil layer above the bedrock can also be mobilized in the process of deformation of the pile body under load. For the deep, long and large bored rock-socketed pile, its bearing behavior is consistent with that of the non-socketed pile, and the characteristics are that the pile end reaction is small, the rock-socketed section has high side resistance, and the role of rock-socketing is mainly in the side resistance rather than the end bearing.

[0003] The Chinese patent with the authorized publication number CN102086645B discloses a rock-socketed pile and a construction method thereof, which comprises an inner tube, a sleeve and a grout outlet pipe. One end of the inner tube extends into a bedrock pile hole, and the other end extends into the sleeve. The inner tube comprises a steel pipe, filled concrete and a grouting pipe. The grouting pipe penetrates through the inner tube until it extends out. The filled concrete and the grouting pipe are prefabricated in the steel pipe. There is a gap between the outer wall of the inner tube and the pile hole and the sleeve. The gap is filled with aggregate concrete, and gravel is used as aggregate. The aggregate concrete can make the inner tube and the sleeve become one body, and the aggregate concrete can eliminate the gap between the pile hole and the sleeve, so that the pile hole is closed to the outside. The sleeve pours concrete by the guide pipe method, and one end of the grout outlet pipe is inserted into the aggregate concrete, and the other end extends out of the sleeve.

[0004] The inner tube of the steel pipe concrete is inserted into the rock-socketed part and prefabricated with concrete, and extends into the sleeve for a certain length. The steel pipe concrete inner tube can greatly improve the horizontal bearing capacity of the rock-socketed part, but the construction requirements for the concrete in the rock-socketed pile are also higher. Especially when the rock-socketed hole construction adopts mud wall protection, the guide pipe method is generally used to pour concrete, that is, the guide pipe for pouring concrete is always buried in the concrete during the pouring process, and the guide pipe is lifted synchronously with the lifting of the concrete surface, and the mud and concrete float slurry are lifted out of the sleeve of the rock-socketed pile by the concrete. Due to the existence of the steel pipe concrete inner tube, the guide pipe for pouring concrete can only be lowered to the top of the inner tube, so the gap between the outer surface of the inner tube and the sleeve and the gap between the inner tube and the rock hole wall cannot be replaced by the concrete. For the rock surface without overburden layer, the rock-socketed pile with the sleeve reaching the rock surface can be embedded without mud wall protection, but the space between the steel pipe concrete inner tube and the sleeve and the rock hole wall is filled with chaotic water. If the concrete is not poured by the guide pipe method, the concrete poured from the top of the inner tube will increase the water content and cause segregation under the action of water, and it is also difficult to ensure that the concrete fills all the gaps outside the inner tube, which greatly reduces the strength of the concrete and the bearing capacity of the rock-socketed pile.

[0005] The prior art in the above has the following defects: the existing rock-socketed pile and the prefabricated column are connected through a cement mortar layer, and the connection strength between the rock-socketed pile and the prefabricated column is low. SUMMARY

[0006] The present application is to solve the problem of the prior art in the above and provide a rock-socketed pile and a construction method thereof, which solve the problem of low connection strength between the rock-socketed pile and the prefabricated column in the prior art.

[0007] The above application object of the present application is realized by the following technical scheme: a rock-socketed pile, comprising pile foundation, column base arranged in sequence from bottom to top, the column base comprises a pedestal arranged on the pile foundation, an interface column hole is arranged on the top surface of the pedestal, a plurality of convex columns are arranged on the outer side wall of the pedestal, an outer sliding hole and an inner sliding hole are arranged in sequence on the end face of the convex column away from the pedestal towards the pedestal, a lock column sliding rod is arranged in the inner sliding hole, the end of the lock column sliding rod away from the mounting hole is provided with a lock column sliding plate in sliding cooperation with the outer sliding hole, a push plate spring is arranged on the lock column sliding rod, one end of the push plate spring abuts against the bottom of the outer sliding hole, and the other end of the push plate spring abuts against the lock column sliding plate.

[0008] The present application is further provided: a sealing plug is arranged at the hole opening of the outer sliding hole away from the inner sliding hole, and a grouting hole is arranged on the sealing plug and communicates with the outer sliding hole.

[0009] The present application is further provided: the pile foundation comprises a base body arranged below the pedestal, a mounting hole is arranged on the top surface of the base body and is in plug-in cooperation with the pedestal, a lock seat ring groove is arranged on the hole wall of the mounting hole, a lower mounting ring groove is arranged on the outer side wall of the pedestal and is aligned with the lock seat ring groove, a lock seat clasp is arranged in the lower mounting ring groove in sliding manner, and a push ring mechanism is arranged in the pedestal.

[0010] The present application is further provided: an upper mounting ring groove is arranged on the outer side wall of the pedestal, the upper mounting ring groove is located above the lower mounting ring groove, a hidden wheel groove is arranged on the groove wall of the lower mounting ring groove, a plurality of shaft mounting holes are arranged on the pedestal and communicate with the upper mounting ring groove and the hidden wheel groove, the push ring mechanism comprises a four-corner cam arranged in the hidden wheel groove in rotating manner and abutting against the end face of the lock seat clasp away from the hidden wheel groove, a linkage shaft coaxially arranged on the four-corner cam and in rotating cooperation with the shaft mounting hole, a drive gear arranged in the upper mounting ring groove in rotating manner and coaxially arranged on the top of the linkage shaft, and a drive gear ring embedded in the upper mounting ring groove in inner ring and in meshing cooperation with the drive gear.

[0011] The present application is further provided: a mortar groove is arranged on the bottom surface of the pedestal, a plurality of reinforcing bar holes are arranged on the bottom wall of the interface column hole and communicate with the mortar groove, and the reinforcing bar holes and the mortar groove are filled with concrete mortar.

[0012] The application is further provided with a reinforcing cage in the base body, the reinforcing cage comprising vertical bars protruding out of the base body and into the reinforcing hole, reinforcing bars arranged on the inner side of the vertical bars, and spiral hoops arranged on the outer side of the vertical bars, the diameter of the reinforcing hole being larger than that of the vertical bars.

[0013] The application also discloses a construction method of the rock-socketed pile.

[0014] Step 1: construction preparation;

[0015] Step 2: burying the steel casing;

[0016] Step 3: excavating the mud pool;

[0017] Step 4: excavating the pile hole;

[0018] Step 5: hoisting the reinforcing cage;

[0019] Step 6: pouring the formed pile foundation;

[0020] Step 7: pulling out the steel casing;

[0021] Step 8: pile foundation quality detection;

[0022] Step 9: hoisting the prefabricated seat.

[0023] The application is further provided with the following steps in the step 1:

[0024] Step 1.1: site cleaning: before the drill is positioned, the silt and quicksand on the original ground are removed, the whole site is leveled and tamped to serve as the construction operation platform of the drill, and the site is ensured to have a certain hardness to prevent the drill from sinking or tilting, if the soft soil of the site is relatively thick and the hardness is not enough, 30cm-thick gravel is paved on the surface and leveled and rolled;

[0025] Step 1.2: measurement and lofting: measurement and lofting are performed, the route center line and the center lines of the piles are drawn, and the accurate positions of the holes are determined.

[0026] The application is further provided with the following steps in the step 4:

[0027] Step 4.1: drill positioning: the place where the drill is installed is leveled and tamped in advance to prevent the drill from tilting and sinking during the drilling process and affecting the quality of the formed hole, the drill is installed and positioned by the crane, the pile protection point is guided to the wall of the hole protection casing by the measuring instrument, the cross intersection is formed to position the main rope of the drill, and the positioning deviation of the drill should be less than 50mm;

[0028] Step 4.2, drilling: before drilling, add clay into the steel casing, and when the surface soil is loose, also add small pieces of stone, and inject mud and water, and extrude the mud paste and stone to the hole wall by means of the impact of the drill bit; during drilling, check the rebound of the main rope of the drilling machine at any time, and listen to the impact sound of the drill cone to identify the hole bottom condition; the mud level in the hole should be higher than the foot of the casing by more than 0.5 m to prevent the mud surface from splashing and damaging the hole wall of the casing foot, but lower than the top of the casing by 0.3 m to prevent mud overflow; check the wear of the steel wire rope and the drill bit frequently during the impact process;

[0029] Step 4.3, hole cleaning: first, use a hole detector to check the hole diameter, hole verticality and hole depth; after the drilling reaches the designed depth and the hole quality meets the requirements of the drawing, hole cleaning should be carried out immediately; the mud attached to the casing should be cleaned, and the sediment of the hole bottom drilling residue and mud sand should be removed to ensure that the thickness of the sediment after hole cleaning meets the design specification and specification requirements.

[0030] Further, in step 9, the hoist lifts the prefabricated column seat to the top of the pile foundation, then lowers the column seat, so that the column seat is inserted into the mounting insertion hole of the base body, at this time, the lower mounting ring groove is aligned with the lock seat ring groove, then the worker rotates the driving gear ring to drive the driving gear to rotate, the driving gear rotates to drive the four-corner cam to rotate through the linkage shaft, until the long convex corner of the four-corner cam abuts against the end face of the lock seat clasp ring facing the four-corner cam, the four-corner cam pushes the lock seat clasp ring to slide out of the lower mounting ring groove and insert into the lock seat ring groove.

[0031] In summary, the beneficial technical effects of the present application are that the rock-socketed pile and the prefabricated column are connected through the lock column sliding rod and the lock column insertion hole in plug-in cooperation, and the high-strength concrete mortar arranged on the abutting surface of the two, and the connection strength between the rock-socketed pile and the prefabricated column is high. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a cross-sectional structure schematic view of the rock-socketed pile in the present application;

[0033] Figure 2 is a structure schematic view of the half seat body and the push ring mechanism in the present application;

[0034] Figure 3 is a cross-sectional structure schematic view of the column seat in the present application;

[0035] Figure 4 is a structure schematic view of the lock seat clasp ring and the push ring mechanism in the present application;

[0036] Figure 5 is a cross-sectional structure schematic view of the column seat in the present application.

[0037] In the above drawings: 1, pile foundation; 2, base body; 21, mounting socket; 22, lock seat ring groove; 3, steel reinforcement cage; 31, vertical reinforcement; 32, reinforcing bar; 33, spiral stirrup; 4, column base; 5, pedestal; 51, half seat body; 6, column connecting hole; 7, mortar groove; 8, steel bar penetrating hole; 9, upper mounting ring groove; 10, lower mounting ring groove; 11, wheel hiding groove; 12, shaft mounting hole; 13, lock seat snap ring; 14, four-corner cam; 15, linkage shaft; 16, driving gear; 17, driving gear ring; 18, protruding column; 19, outer sliding hole; 20, inner sliding hole; 23, lock column sliding rod; 24, lock column sliding plate; 25, push plate spring; 26, plug; 27, grouting hole; 28, column body; 29, lock column socket. Embodiment

[0038] In order to make the technical means, creative features, purposes and effects of the present application clearer and easier to understand, the present application will be further described below in conjunction with the drawings and specific embodiments.

[0039] As shown in Figure 1 , the present application proposes a rock-embedded pile, which comprises a pile foundation 1 and a column base 4 arranged in the pile hole in sequence from bottom to top, wherein the pile foundation 1 is constructed by cast-in-place, and the column base 4 is a prefabricated component.

[0040] As shown in Figure 1 , the pile foundation 1 comprises a base body 2 and a steel reinforcement cage 3 arranged in the base body 2. The base body 2 is poured by concrete, and a mounting socket 21 is formed on the top surface of the base body 2. The cross section of the mounting socket 21 is circular, and a lock seat ring groove 22 is formed on the hole wall of the mounting socket 21. The cross section of the lock seat ring groove 22 is circular ring shape. The steel reinforcement cage 3 is pre-processed in the factory according to the design drawing. The steel reinforcement cage 3 comprises vertical reinforcements 31, reinforcing bars 32 and spiral stirrups 33. The vertical reinforcements 31 are vertically arranged, and a plurality of vertical reinforcements 31 are distributed at equal intervals in a circle. The reinforcing bars 32 are arranged at intervals along the length direction of the vertical reinforcements 31. The reinforcing bars 32 are circular ring shape, and arranged inside the circle-shaped vertical reinforcements 31. The reinforcing bars 32 and the vertical reinforcements 31 are fixed by welding. The spiral stirrups 33 are spiral shape, and spirally wound on the outside of the vertical reinforcements 31. The spiral stirrups 33 and the vertical reinforcements 31 are fixed by welding.

[0041] The detailed construction process of the pile foundation 1 in the embodiment is as follows: after the construction preparation, the steel casing is buried, the mud pool is excavated, and the pile hole is excavated in sequence at the construction site, the steel reinforcement cage 3 is put into the turning hole by using the hoist, then the pouring mold designed and processed according to the shape of the base body 2 is put into the turning hole, and then the base body 2 with the mounting socket 21 and the lock seat ring groove 22 is formed by pouring concrete.

[0042] As shown in Figure 1 and 5As shown in the drawings, the column base 4 comprises a cylindrical pedestal 5, and a column receiving hole 6 is formed in the top surface of the pedestal 5, and the cross section of the column receiving hole 6 is circular. A mortar groove 7 is formed in the bottom surface of the pedestal 5, and the cross section of the mortar groove 7 is circular. A plurality of reinforcing bar passing holes 8 are formed in the bottom wall of the column receiving hole 6 in a circumferential direction, and the reinforcing bar passing holes 8 are circular holes. The reinforcing bar passing holes 8 are in communication with the column receiving hole 6 and the mortar groove 7. The diameter of the reinforcing bar passing holes 8 is greater than the diameter of the vertical reinforcement 31, and the number of the reinforcing bar passing holes 8 is consistent with the number of the vertical reinforcement 31.

[0043] As shown in the drawings, Figure 1 and 2 An upper mounting ring groove 9 and a lower mounting ring groove 10 are formed in the outer side wall of the pedestal 5, and the cross sections of the upper mounting ring groove 9 and the lower mounting ring groove 10 are both circular annular. The upper mounting ring groove 9 is directly above the lower mounting ring groove 10. Two wheel hiding grooves 11 are formed in the groove wall of the lower mounting ring groove 10, and the two wheel hiding grooves 11 are symmetrical to each other. An axle mounting hole 12 is formed in the pedestal 5, and the axle mounting hole 12 is a circular hole. The number of the axle mounting hole 12 is two, and the two axle mounting holes 12 are symmetrical to each other. The axle mounting hole 12 is in communication with the upper mounting ring groove 9 and the wheel hiding groove 11. The two axle mounting holes 12 are both located outside the reinforcing bar passing hole 8.

[0044] As shown in the drawings, Figure 1 and 2 The pedestal 5 comprises a pair of half pedestal bodies 51. The column receiving hole 6, the mortar groove 7, the two reinforcing bar passing holes 8 in the middle, the upper mounting ring groove 9, the lower mounting ring groove 10, the wheel hiding groove 11, and the axle mounting hole 12 are all formed in the two half pedestal bodies 51, and the two half pedestal bodies 51 are spliced to form the pedestal 5.

[0045] As shown in the drawings, Figure 1 and 4 Two lock seat snap rings 13 are slidably arranged in the lower mounting ring groove 10, and the cross section of the lock seat snap ring 13 is a semi-circular annular. The lock seat snap ring 13 is used for plug-in cooperation with the lock seat ring groove 22. A push ring mechanism is arranged in the pedestal 5, and the push ring mechanism is used for embedding the lock seat snap ring 13 into the lock seat ring groove 22 to limit the separation of the pile foundation 1 and the column base 4.

[0046] As shown in the drawings, Figure 1 and 4As shown, the push ring mechanism includes a four-corner cam 14, a linkage shaft 15, a drive gear 16, and a drive gear ring 17. The four-corner cam 14 is rotationally arranged in the hidden wheel groove 11, and has two short cam corners close to the center and two long cam corners far from the center. In the initial state, the end face of the lock seat snap ring 13 facing the four-corner cam 14 abuts against one of the short cam corners of the four-corner cam 14. When the four-corner cam 14 rotates until the long cam corner of the four-corner cam 14 abuts against the end face of the lock seat snap ring 13 facing the four-corner cam 14, the four-corner cam 14 will push the lock seat snap ring 13 to slide out of the lower mounting ring groove 10. The linkage shaft 15 is coaxially arranged above the four-corner cam 14, and is integrally connected with the four-corner cam 14. The linkage shaft 15 passes through the shaft hole 12 rotationally matched with the linkage shaft 15. Each end of the linkage shaft 15 away from the four-corner cam 14 is coaxially connected with the drive gear 16, and the drive gear 16 is rotationally arranged in the upper mounting ring groove 9. The drive gear ring 17 is in the shape of a circular ring, and the inner ring part of the drive gear ring 17 is embedded in the upper mounting ring groove 9. The inner wall of the drive gear ring 17 has a tooth surface meshing with the two drive gears 16. When the column base 4 is installed on the pile foundation 1, the drive gears 16 are screw-connected to the top surface of the base body 2.

[0047] The detailed installation process of the pile foundation 1 and the column base 4 in this embodiment is as follows: the hoist lifts the prefabricated column base 4 to the top of the pile foundation 1, and then lowers the column base 4 so that the column base 4 is inserted into the mounting insertion hole 21 of the base body 2. At this time, the lower mounting ring groove 10 is aligned with the lock seat ring groove 22. Then, the worker rotates the drive gear ring 17 to drive the drive gears 16 to rotate. The rotation of the drive gears 16 drives the four-corner cam 14 to rotate through the linkage shaft 15 until the long cam corner of the four-corner cam 14 abuts against the end face of the lock seat snap ring 13 facing the four-corner cam 14. At this time, the four-corner cam 14 pushes the lock seat snap ring 13 to slide out of the lower mounting ring groove 10 and is inserted into the lock seat ring groove 22. At this time, the lock seat snap ring 13 is half in the lower mounting ring groove 10 and half in the lock seat ring groove 22, so that the pile foundation 1 and the column base 4 are restricted from being separated.

[0048] As shown in Figure 5 The outer side wall of the pedestal 5 is symmetrically provided with two cylindrical protrusions 18, and the protrusions 18 are integrally connected with the pedestal 5. The end face of the protrusion 18 away from the pedestal 5 is sequentially provided with an outer sliding hole 19 and an inner sliding hole 20 in the direction close to the pedestal 5. The outer sliding hole 19 and the inner sliding hole 20 are both circular holes, and the hole diameter of the outer sliding hole 19 is larger than that of the inner sliding hole 20.

[0049] As shown in Figure 5As shown, the lock post sliding rod 23 is slidingly arranged in the inner sliding hole 20, the end of the lock post sliding rod 23 away from the mounting plug hole 21 extends into the outer sliding hole 19, the end of the lock post sliding rod 23 away from the mounting plug hole 21 is integrally connected with the lock post sliding plate 24, and the lock post sliding plate 24 is slidingly matched with the outer sliding hole 19. The push plate spring 25 is sleeved on the lock post sliding rod 23, one end of the push plate spring 25 abuts against the hole bottom of the outer sliding hole 19, and the other end abuts against the end face of the lock post sliding plate 24 facing the inner sliding hole 20. The push plate spring 25 is used for pushing the lock post sliding plate 24 to move away from the inner sliding hole 20, and in the initial state, the lock post sliding rod 23 can keep the state of not extending into the mounting plug hole 21. The sealing plug 26 is inserted into the opening of the outer sliding hole 19 away from the inner sliding hole 20, and the middle part of the sealing plug 26 is provided with the grouting hole 27 in communication with the outer sliding hole 19.

[0050] As shown in the drawings, Figure 5 The application further discloses a precast column, which comprises a cylindrical column body 28, the column body 28 is in plug-in cooperation with the mounting plug hole 21, and the bottom of the outer side wall of the column body 28 is provided with a lock post plug hole 29 for aligning with the inner sliding hole 20.

[0051] The detailed installation process of the precast column and the rock-socketed pile in the embodiment is as follows: a layer of high-strength concrete mortar is laid on the hole bottom of the mounting plug hole 21 by workers, then the precast column is hoisted to the top of the column base 4 by using a hoisting machine, then the position of the precast column is adjusted, so that when the precast column is inserted into the mounting plug hole 21, the lock post plug hole 29 can be aligned with the inner sliding hole 20, then the precast column is lowered until the column body 28 is inserted into the mounting plug hole 21 and the lock post plug hole 29 is aligned with the inner sliding hole 20, then a high-pressure grouting machine grouts into the outer sliding hole 19 through the grouting hole 27, and then the cement mortar pushes the lock post sliding plate 24 and the lock post sliding rod 23 to move towards the mounting plug hole 21 until the lock post sliding rod 23 is inserted into the lock post plug hole 29, and after the cement mortar in the outer sliding hole 19 hardens, the lock post sliding rod 23 can keep the state of being inserted into the lock post plug hole 29, and then the precast column and the rock-socketed pile are limited to be separated.

[0052] The lock post sliding rod 23 and the lock post plug hole 29 in plug-in cooperation and the high-strength concrete mortar arranged on the abutting surface of the lock post sliding rod 23 and the lock post plug hole 29 are used for connecting the rock-socketed pile and the precast column, and the connection strength between the rock-socketed pile and the precast column is high.

[0053] A construction method of a rock-socketed pile, the construction method comprising the following steps:

[0054] Step 1: construction preparation.

[0055] Step 1.1: site cleaning.

[0056] Before the drilling rig is in place, the silt and quicksand of the original ground is removed, and the entire site is leveled and rammed to serve as the working platform of the drilling rig, and the site is ensured to have a certain hardness so as to avoid the sinking or tilting of the drilling rig. If the soft soil of the site is relatively thick and the hardness is not enough, a 30cm-thick stone sheet is laid on the surface and leveled and rolled to ensure the safety of the working operation of the drilling rig.

[0057] Step 1.2: Measurement and setting out.

[0058] In the step 1.2, the measurement and setting out is performed, the route center line and the center line of each pile are drawn, and the accurate position of the hole is determined.

[0059] Step 2: Embedding the steel casing.

[0060] In the step 2, the steel casing is rolled in the factory by using δ=6mm-8mm steel plate, and a 10mm-thick steel plate is added as an outer stiffener within a range of 0.6m from the upper and lower ends of the casing to prevent the deformation of the steel casing. The casing is processed into a section of 3m or 5m long, and the two ends of each section of the casing are fixed by using a cross brace to prevent the deformation during hoisting and transportation.

[0061] In the step 2, when embedding the steel casing, a foundation pit with a depth of 1m is first dug at the hole position, then the steel casing is hoisted above the hole position by using a vibrating hammer, and then the steel casing is vibrated and pressed into the soil foundation by the vibrating hammer, and it is ensured that the center vertical line of the steel casing coincides with the center line of the pile, the allowable deviation of the plan position is 50mm, the inclination is not greater than 1%, and the top surface of the steel casing is 0.3m above the ground (1.0-2.0m above the water surface). High-quality clay is filled and rammed in layers in the foundation pit, and the high-quality clay is surrounded around the periphery of the steel casing. The purpose of filling the high-quality clay is to maintain the stability of the steel casing by using the pressure and water-blocking effect of the clay. After the installation of the steel casing, the pile position is checked and accurately controlled by using a total station instrument.

[0062] Step 3: Excavating the mud pool.

[0063] In the step 3, before the excavation of the foundation pit, the engineering department technician measures and positions the mud pool according to the designed position, determines the excavation line of the mud pool and spreads the lime line, confirms the range of the excavation of the mud pool according to the measurement and setting out, and excavates the mud pool. The mud pool must include the separated slurry storage pool and the sedimentation pool, a groove for the flow of mud is excavated between the sedimentation pool and the mud port of the steel casing of the pile hole, the width of the groove is not more than 1m, the depth is not more than 50cm, the groove is preferably protected by using a mold to prevent the collapse of the soil at the edge of the groove. The mud with drilling cuttings discharged during drilling is discharged to the sedimentation pool, and after preliminary sedimentation in the sedimentation pool, it flows into the slurry storage pool for use by the slurry pump. The periphery of the mud pool should be provided with a steel pipe protective fence, the protective fence is closed by using a green dense mesh net, and a safety warning sign is provided.

[0064] Step 4: Excavating the pile hole.

[0065] Step 4.1, Drilling rig in place: The drilling rig installation site is leveled and compacted in advance to prevent the drilling rig from tilting and sinking during drilling, which affects the quality of the hole. The drilling rig is installed in place using a crane, and the pile protection point is guided to the wall of the hole mouth protection cylinder using measuring instruments to form a cross intersection for drilling rig main rope positioning. The drilling rig positioning deviation should be less than 50mm. The drill bit uses a cross-shaped hammer head, and the side blade and bottom blade are made of rail steel or wear-resistant welded block surfacing.

[0066] Step 4.2, Drilling: Before drilling, add clay to the steel casing, and when the surface soil is loose, mix in small stones and inject mud and water. Use the impact of the drill bit to push the mud paste and stones towards the hole wall. During drilling, check the rebound of the drilling rig main rope at all times, listen to the impact sound of the drill cone to determine the hole bottom condition, and ensure that the hole mud level is higher than the casing foot by more than 0.5m to prevent the mud surface from splashing and damaging the casing foot hole wall, but lower than the casing top surface by 0.3m to prevent mud overflow. Check the wear of the steel wire rope and drill bit frequently during the impact process to prevent safety and quality accidents.

[0067] Step 4.3, Hole cleaning: First, use a hole detector to test the hole diameter, hole verticality, and hole depth. After the drilling reaches the designed depth and the hole quality meets the requirements of the drawings, immediately perform hole cleaning. Clean the mud attached to the casing, remove the hole bottom drilling residue and sediment, and ensure that the thickness of the hole bottom drilling residue after cleaning meets the design specifications and requirements.

[0068] Step 5: Hoist the steel reinforcement cage 3.

[0069] In step 5, the steel reinforcement cage 3 is pre-processed according to the pre-set drawings in the factory and transported to the construction site by transport vehicle. The steel reinforcement cage 3 is lifted using the multi-point lifting method and placed into the pile hole.

[0070] Step 6: Pour the formed pile foundation 1.

[0071] In step 6, the formed pile foundation 1 is poured using the direct pipe method. Before and after use, the specifications, quality, and splicing structure of the pipe are carefully inspected, and splicing and water pressure tests are performed. The test water pressure should not be less than 1.3 times the maximum pressure that the pipe may withstand during concrete pouring. After 5 minutes of pressure testing, the pipe rolls several times without deformation of the pipe wall and the joint does not leak water, indicating that it is qualified. Then, the outer wall of the pipe is numbered and marked with clear markings. The pouring of underwater concrete must be continuous and cannot be stopped in the middle. During the pouring process, the descending of the concrete in the pipe and the rising of the water level in the hole should be observed, and the height of the concrete top surface in the hole should be measured in time to correctly guide the lifting and removal of the pipe, ensuring that the pipe is buried to a depth of not less than 2m and not more than 6m, and does not enter the water.

[0072] Step 7: Pull out the steel casing.

[0073] In the step 7, the steel casing can be pulled out by using the air pressure jacking method or the vibration hammer pulling method.

[0074] Step 8: quality detection of the pile foundation 1.

[0075] In the step 8, the quality detection of the pile foundation 1 refers to the use of scattering, acoustic measurement, excitation and other technical means to inspect the core sample strength and fragmentation degree of the pile foundation 1.

[0076] Step 9: hoisting the column seat 4.

[0077] In the step 9, the hoisting machine hoists the prefabricated column seat 4 to the top of the pile foundation 1, and then lowers the column seat 4 so that the column seat 4 is inserted into the mounting insertion hole 21 of the base body 2. At this time, the lower mounting ring groove 10 is aligned with the lock seat ring groove 22. Then, the workers rotate the driving gear ring 17 to drive the driving gear 16 to rotate. The rotation of the driving gear 16 drives the four-corner cam 14 to rotate through the linkage shaft 15 until the long lobe of the four-corner cam 14 abuts against the end face of the lock seat clasp 13 facing the four-corner cam 14. At this time, the four-corner cam 14 pushes the lock seat clasp 13 to slide out of the lower mounting ring groove 10 and insert into the lock seat ring groove 22. At this time, the lock seat clasp 13 is half in the lower mounting ring groove 10 and half in the lock seat ring groove 22. Then, the pile foundation 1 and the column seat 4 are limited to be separated.

[0078] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application. They should all be covered in the scope of the claims of the present application.

Claims

1. A rock-socketed pile, characterized in that: The utility model comprises a pile foundation (1) and a column seat (4) arranged in sequence from bottom to top, wherein the column seat (4) comprises a pedestal (5) arranged on the pile foundation (1), a column receiving hole (6) is provided on the top surface of the pedestal (5), a plurality of protruding columns (18) are provided on the outer wall of the pedestal (5), an outer sliding hole (19) and an inner sliding hole (20) are provided in sequence on the end surface of the protruding column (18) away from the pedestal (5) toward the pedestal (5), a locking column slide rod (23) is slidably arranged in the inner sliding hole (20), and a locking column slide rod (24) slidably matched with the outer sliding hole (19) is provided at one end of the locking column slide rod (23) away from the installation socket (21), and a push plate spring (25) is sleeved on the locking column slide rod (23), one end of which is against the bottom of the outer sliding hole (19) and the other end of which is against the locking column slide rod (24); A sealing plug (26) is provided at the opening of the outer sliding hole (19) away from the inner sliding hole (20), and a grouting hole (27) is provided on the sealing plug (26) and is connected to the outer sliding hole (19); The pile foundation (1) comprises a base (2) arranged below a pedestal (5), a mounting socket (21) for plugging and matching with the pedestal (5) is provided on the top surface of the base (2), a lock seat ring groove (22) is provided on the hole wall of the mounting socket (21), a lower mounting ring groove (10) for aligning with the lock seat ring groove (22) is provided on the outer wall of the pedestal (5), a lock seat snap ring (13) is slidably provided in the lower mounting ring groove (10), and a push ring mechanism is provided in the pedestal (5); An upper mounting ring groove (9) is provided on the outer side wall of the pedestal (5), the upper mounting ring groove (9) is located above the lower mounting ring groove (10), a wheel groove (11) is provided on the groove wall of the lower mounting ring groove (10), a plurality of shaft mounting holes (12) are provided on the pedestal (5) for connecting the upper mounting ring groove (9) and the wheel groove (11), the pushing ring mechanism comprises a four-corner cam (14) which is rotatably arranged in the wheel groove (11) and whose convex corners abut against the end face of the lock seat snap ring (13) facing the wheel groove (11), a linkage shaft (15) which is coaxially arranged on the four-corner cam (14) and rotatably matched with the shaft mounting hole (12), a driving gear (16) which is rotatably arranged in the upper mounting ring groove (9) and coaxially arranged on the top of the linkage shaft (15), and a driving gear ring (17) whose inner ring is embedded in the upper mounting ring groove (9) and meshed with the driving gear (16).

2. The rock-socketed pile according to claim 1, characterized in that: A mortar groove (7) is provided on the bottom surface of the pedestal (5), and a plurality of rib-penetrating holes (8) communicating with the mortar groove (7) are provided on the bottom wall of the column-connecting hole (6). The rib-penetrating holes (8) and the mortar groove (7) are filled with concrete mortar.

3. The rock-socketed pile according to claim 2, characterized in that: A steel cage (3) is provided in the base (2), the steel cage (3) comprising vertical bars (31) whose tops extend out of the base (2) and into the bar holes (8), reinforcing bars (32) arranged inside the vertical bars (31), and spiral stirrups (33) spirally arranged outside the vertical bars (31), wherein the diameter of the bar holes (8) is larger than the diameter of the vertical bars (31).

4. The rock-socketed pile construction method according to claim 1, characterized in that: The construction method comprises the following steps: Step 1: Construction preparation; Step 2: bury the steel casing; Step 3: Excavate the mud pool; Step 4: Excavate the pile hole; Step 5: Hoisting the steel cage (3); Step 6: Casting pile foundation (1); Step 7: Pull out the steel casing; Step 8: Pile foundation (1) quality inspection; Step 9: Hoist the prefabricated seat.

5. The rock-socketed pile construction method according to claim 4, characterized in that: The step 1 further comprises the following steps: Step 1.1, site cleaning: Before the drilling rig is in place, remove the silt and quicksand on the original ground, then level the entire site and compact it to serve as the construction platform for the drilling rig. Ensure that the site has a certain hardness to prevent the drilling rig from sinking or tilting. If the site has thick soft soil and the hardness is not enough, lay 30cm thick stone slabs on the surface and roll it flat; Step 1.2, measurement and layout: Measure and lay out the lines, mark the center line of the route and the center line of each pile, and determine the exact location of the hole.

6. The rock-socketed pile construction method according to claim 4, characterized in that: The step 4 further comprises the following steps: Step 4.1, Drilling rig in place: The drilling rig installation area should be leveled and compacted in advance to prevent the drilling rig from tilting or sinking during the drilling process, which would affect the quality of the hole. The drilling rig is installed in place using a crane. The pile guard points are guided to the wall of the hole casing using a measuring instrument, forming a cross to position the main rope of the drilling rig. The drilling rig positioning deviation should be less than 50mm. Step 4.2, Drilling: Before drilling, add clay to the steel casing. If the surface soil is loose, add small pieces of stone and inject mud and water. Use the impact of the drill bit to squeeze the mud paste and stones toward the hole wall. During drilling, check the rebound of the drill rope at any time and listen to the impact sound of the drill bit to identify the hole bottom. The mud level in the hole must be at least 0.5m higher than the casing foot to prevent the mud surface from rippling and damaging the casing foot and hole wall, but 0.3m lower than the casing top surface to prevent mud overflow. Check the wear of the wire rope and drill bit frequently during the impact process. Step 4.3, hole cleaning: First use a borehole inspection device to check the hole diameter, hole verticality, and hole depth. After the hole reaches the designed depth and the hole quality meets the requirements of the drawing, the hole should be cleaned immediately. The mud attached to the casing should be cleaned, and the drill cuttings and mud and sand sediments at the bottom of the hole should be removed. Ensure that the thickness of the drill cuttings sediment at the bottom of the hole after cleaning meets the design specifications and requirements.

7. The rock-socketed pile construction method according to claim 4, characterized in that: In step 9, the crane hoists the prefabricated column seat (4) to the top of the pile foundation (1), and then lowers the column seat (4) so ​​that the column seat (4) is inserted into the mounting socket (21) of the base (2). At this time, the lower mounting ring groove (10) is aligned with the lock seat ring groove (22). Then, the worker rotates the drive gear ring (17) to drive the drive gear (16) to rotate. The rotation of the drive gear (16) drives the four-corner cam (14) to rotate through the linkage shaft (15) until the long convex corner of the four-corner cam (14) and the lock seat snap ring (13) face the end face of the four-corner cam (14). The four-corner cam (14) pushes the lock seat snap ring (13) to slide out of the lower mounting ring groove (10) and insert it into the lock seat ring groove (22).

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