CN111749066A - Roadbed base gravel pile composite foundation structure and construction method - Google Patents
Roadbed base gravel pile composite foundation structure and construction method Download PDFInfo
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- CN111749066A CN111749066A CN202010703221.0A CN202010703221A CN111749066A CN 111749066 A CN111749066 A CN 111749066A CN 202010703221 A CN202010703221 A CN 202010703221A CN 111749066 A CN111749066 A CN 111749066A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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Abstract
The invention relates to the technical field of roadbed foundation piles, in particular to a roadbed basement gravel pile composite foundation structure and a construction method thereof, which comprises a foundation soil layer and a plurality of gravel piles arranged in the foundation soil layer, wherein the foundation soil layer is provided with pile holes for accommodating the gravel piles, each gravel pile comprises a sleeve for filling gravel, a steel reinforcement cage is arranged in the sleeve, a grouting steel pipe is arranged in the steel reinforcement cage, the side wall of the grouting steel pipe is provided with a plurality of grout outlet holes, four moving rods are arranged in the grouting steel pipe, and the four moving rods are provided with a plurality of support rods, and each movable rod comprises an upper half section and a lower half section, a plurality of support rods arranged on the two movable rods are positioned on the upper half section of the movable rod, a plurality of support rods arranged on the other two movable rods are positioned on the lower half section of the movable rod, the side wall of the grouting steel pipe is provided with a plurality of through holes corresponding to the support rods, the movable rods push, and each support rod penetrates through the through holes and the reinforcement cage. The invention provides a composite foundation structure and a construction method, which are used for enhancing the bearing capacity of a composite foundation.
Description
Technical Field
The invention relates to the technical field of roadbed foundation piles, in particular to a roadbed foundation gravel pile composite foundation structure and a construction method.
Background
The composite foundation is a natural foundation in which the soil is reinforced or replaced in the foundation treatment process, the reinforcing area is an artificial foundation consisting of a base body and a reinforcing body, the base body and the reinforcing body share the load under the load effect, and the soft soil foundation is generally reinforced by adopting gravel piles during the construction of the composite foundation.
In the prior art, a gravel pile composite foundation structure generally comprises a foundation soil layer and a plurality of gravel piles arranged in the foundation soil layer, holes are dug in the foundation soil layer to install the required gravel piles, the gravel piles are pile bodies filled with gravel, during construction, a vibration pile driver is used for driving sleeves into the pile holes, gravel is put into the pipes, the gravel is pressed into the soil, pipes are gradually pulled out, the gravel is vibrated and compacted in sections, gravel piles are formed, soil bodies among the piles are extruded and compacted, a gravel mattress layer is laid on the top of the gravel piles, and the soil between the gravel piles and the original soil layer forms a composite foundation which jointly bears loads of an upper building structure.
The above prior art solutions have the following drawbacks: because the gravel pile belongs to the pile of discrete materials, mainly, the gravel pile installed on the foundation soil layer has a single structure, and only depends on the self strength of the pile body and the restraint of surrounding soil to resist the vertical load transmitted by the foundation, so that the restraint force between the pile body and the surrounding soil is not strong, the soil layer around the pile body is softer, the restraint force on the gravel pile is poorer, the pile body is easy to deform and loosen, and the bearing capacity of the composite foundation is lower.
Disclosure of Invention
In view of the defects in the prior art, one of the purposes of the invention is to provide a roadbed foundation gravel pile composite foundation structure which has the advantage of improving the bearing capacity.
The above object of the present invention is achieved by the following technical solutions:
a roadbed foundation gravel pile composite foundation structure comprises a foundation soil layer and a plurality of gravel piles arranged in the foundation soil layer, wherein pile holes for accommodating the gravel piles are formed in the foundation soil layer, each gravel pile comprises a sleeve for filling gravel filler to form a pile body, a steel reinforcement cage is arranged in the sleeve, the steel reinforcement cage and the pile holes are coaxially arranged, a grouting steel pipe is arranged in the steel reinforcement cage, the side wall of the grouting steel pipe is provided with a plurality of grout outlet holes for filling concrete grout, four moving rods are arranged in the grouting steel pipe, the four moving rods are arranged along the length direction of the grouting steel pipe and provided with a plurality of supporting rods, the plurality of supporting rods are arranged along the length direction corresponding to the moving rods, each moving rod comprises an upper half section and a lower half section, and the plurality of supporting rods arranged on the two moving rods are positioned on the upper half sections of the moving rods, the setting is two other many on the carriage release lever branch is located the second half section of carriage release lever, the lateral wall of grout steel pipe be provided with a plurality of with the through-hole that branch corresponds, the carriage release lever promotes, each branch runs through the through-hole and the steel reinforcement cage stretches out outside the steel reinforcement cage, grout steel pipe and each be provided with between the carriage release lever and be used for fixing the fixed subassembly of carriage release lever.
By adopting the technical scheme, the steel reinforcement cage is additionally arranged in the sleeve, the grouting steel pipe is additionally arranged in the steel reinforcement cage, the plurality of support rods extending out of the grouting steel pipe and the steel reinforcement cage are additionally arranged in the grouting steel pipe, so that the supporting strength of the gravel pile can be enhanced, the deformation of the gravel pile is reduced, the side wall of the grouting steel pipe is provided with the grout outlet, concrete grout is poured into the grout outlet, the concrete grout flows out between the sleeve and the steel reinforcement cage through the grout outlet, further, the gap between the gravel fillers can be reduced, the bonding force between the gravel fillers is enhanced, the gravel pile and the soil layer of the base form the composite foundation, and the bearing capacity of the composite foundation is enhanced; in addition, the struts of the two moving rods are arranged on the upper half section of the moving rod, the struts of the two moving rods are arranged on the lower half section of the moving rod, during construction, the two moving rods are firstly pushed to enable the struts arranged on the lower half section of the moving rod to extend out of the grouting steel pipe and the steel reinforcement cage, after a part of gravel filler is filled and tamped and compacted, the other two moving rods are pushed to enable the struts arranged on the upper half section of the moving rod to extend out of the grouting steel pipe and the steel reinforcement cage, the gravel filler is put in again and tamped and compacted, and therefore the gravel filler can be tamped uniformly by the gravel filler in a segmented mode, looseness of the gravel filler is reduced, and further a gravel pile foundation is reinforced.
The present invention in a preferred example may be further configured to: and a guide assembly is arranged between each moving rod and the grouting steel pipe, the guide assembly comprises a guide ring and a guide rod, the guide rod is arranged on the grouting steel pipe, the guide ring is connected to one end, close to the bottom of the pile hole, of the moving rod, and the guide ring is sleeved on the guide rod and is in sliding fit with the guide rod.
Through adopting above-mentioned technical scheme, the cooperation that slides of guide bar and guide ring has played the guide effect to the carriage release lever, makes the carriage release lever walk the position at the difficult skew of in-process that removes, and then makes branch better outside pushed grout steel pipe and steel reinforcement cage.
The present invention in a preferred example may be further configured to: the steel reinforcement cage inboard is provided with the spacing sand grip of a plurality of roots, a plurality of spacing sand grip is followed the length direction in reinforcing bar hole sets up, the lateral wall of grout steel pipe is provided with the direction sand grip, the direction sand grip deviates from a side surface of grout steel pipe is provided with each the spacing groove that spacing sand grip corresponds, just the spacing groove certainly the grout steel pipe inserts steel reinforcement cage's one end is followed the length direction of direction sand grip runs through the setting, spacing sand grip with correspond the cooperation of sliding of spacing groove.
Through adopting above-mentioned technical scheme, spacing sand grip and spacing groove sliding fit have played limiting displacement, are difficult for rotatory when making the steel bar cage of being in the grout steel pipe put into, and the constructor of being convenient for puts into the steel bar cage with the steel bar of being in the grout steel pipe.
The present invention in a preferred example may be further configured to: each grout steel pipe top is connected with the holding ring, adjacent two be connected with the connecting pipe between the holding ring, the connecting pipe is cavity setting, just the both ends of connecting pipe are the blind end, adjacent two be provided with between the holding ring a plurality of with the fixed orifices that the connecting pipe corresponds, adjacent two is passed respectively at the both ends of connecting pipe the holding ring corresponds the fixed orifices just stretches into in the holding ring, the both ends of connecting pipe with all be provided with between the locating plate and be used for the fixed connection pipe to be in the intra-annular butt subassembly of holding ring.
Through adopting above-mentioned technical scheme, the connecting force between two adjacent gravel piles can be strengthened in the setting of connecting pipe for even as an organic whole between the pile body of each gravel pile, so to the ground whole reinforcement, the condition that reduces the uneven slope of gravel pile atress takes place.
The present invention in a preferred example may be further configured to: the butt joint component comprises two supporting blocks, the two supporting blocks are respectively positioned at two ends of the connecting pipe in the diameter direction, a connecting hole for enabling each supporting block to extend out of the connecting pipe is formed in the side wall of the connecting pipe, two push rods used for pushing the supporting blocks on two sides of the connecting pipe to extend out of the connecting pipe are arranged in the connecting pipe, the two push rods move in a deviating mode in the connecting pipe, an elastic piece is connected between the two push rods, and when the elastic piece is in a natural state, each supporting block extends out of the corresponding connecting hole and is connected with the inner side wall of the positioning ring in an abutting mode.
Through adopting above-mentioned technical scheme, the setting up of supporting shoe can make the both ends of connecting pipe inject in the locating ring, makes the connecting pipe be difficult for breaking away from in the locating ring, adds the push rod so that promote the supporting shoe and stretch out outside the connecting pipe, because the elastic component has elastic restoring force, makes the push rod be difficult for sliding in the connecting pipe, and then makes the supporting shoe be difficult for dropping in the meeting connecting pipe.
The present invention in a preferred example may be further configured to: each push rod is provided with a shifting block, the side wall of each connecting pipe is provided with a through groove corresponding to the shifting block, the through grooves are arranged along the length direction of the connecting pipe, the shifting blocks penetrate through the through grooves and extend out of the connecting pipes, the shifting blocks are connected with the through grooves in a sliding mode, when the shifting blocks abut against the through grooves, one groove wall of each supporting block is far away from the corresponding through groove, and a buckling piece used for buckling the two shifting blocks is arranged between the two shifting blocks.
Through adopting above-mentioned technical scheme, the setting of shifting block can be convenient for stir the push rod, adds the buckling piece simultaneously, when need not promote the supporting shoe and stretch out the connecting tube outside, the push rod can be fixed in the connecting tube and difficult removal, the connecting tube transport of also being convenient for, when needs stretch out the connecting tube with the supporting shoe outside, only need take off the buckling piece, the push rod removes and makes the supporting shoe stretch out the connecting tube outside.
The present invention in a preferred example may be further configured to: the two sides of the connecting pipe are provided with anchor rods, each push rod is provided with a first through hole, the side wall of the connecting pipe is provided with a second through hole which penetrates through the connecting pipe, and when the elastic piece is in a natural state, the anchor rods are sequentially provided with the first through holes and the second through holes and anchored on the foundation soil layer.
Through adopting above-mentioned technical scheme, the stock runs through first perforation in proper order and the second is perforated and anchor in foundation soil layer, has played the supporting role to the connecting pipe to strengthen the stability of connecting pipe in foundation soil layer.
The present invention in a preferred example may be further configured to: one end of each supporting block, which is positioned in the connecting pipe, is connected with an abutting block used for limiting the position of the supporting block.
Through adopting above-mentioned technical scheme, setting up of butt piece has played limiting displacement to the supporting shoe, is difficult for dropping in the connecting pipe from the connecting pipe when making the supporting shoe release the connecting pipe outside by the push rod.
The present invention in a preferred example may be further configured to: the circumference of the inner side wall of the sleeve is provided with a reinforcing mesh
Through adopting above-mentioned technical scheme, the setting up of reinforcing bar net piece can restrict the rubble filler in the gravel pile and get into the soil body on every side, avoids the rubble filler diffusion and the side direction inflation of gravel pile, reduces gravel pile and warp.
The invention also aims to provide a roadbed foundation gravel pile composite foundation construction method which is suitable for soft foundations and improves the bearing capacity of the composite foundation.
The above object of the present invention is achieved by the following technical solutions:
a roadbed foundation gravel pile composite foundation construction method comprises the following steps:
s1, cleaning soil on the ground, pushing the ground flat and compacting, placing a pile position in a construction range, making construction technology bottom crossing (including pile length, pile position arrangement and other conditions), digging a gravel pile at the pile position by the required depth to form a pile hole, transporting the abandoned soil to a specified position by a trolley, and selecting weatherless gravel, scraps and stone chips according to the required requirements to form a gravel filler according to the mixture ratio;
s2 and ZCQ55 vibration pile drivers are in place, the sleeve is aligned to the pile hole, the vibration pile drivers are started to drive the sleeve into the pile hole, a crane steel bar net piece is used for hoisting the sleeve, a steel bar cage is fixed in the sleeve and is arranged coaxially with the sleeve, and a grouting steel pipe is placed in the steel bar cage;
s3, pushing two moving rods to enable the two opposite moving rods to move away from each other, enabling support rods welded on the lower half sections of the two moving rods to extend out of the grouting steel pipe and the reinforcement cage, fixing the two opposite moving rods, filling matched broken stone filler in S1 into a space between a sleeve and the reinforcement cage, enabling the stacking height of the broken stone filler to be higher than the height of the support rod farthest away from the bottom of a pile hole and the bottom of the pile hole, vibrating the sleeve by using a vibrating pile driver, gradually pulling out the sleeve while vibrating, controlling the pipe pulling speed within the range of 0.8-1.0 m/min, using a rammer to lift the sleeve to a certain height (generally more than 2.0 m), freely falling down to impact ingredients falling down in the sleeve, ramming for multiple times, and compacting and vibrating the broken stone filler;
s4, pushing the other two opposite moving rods to enable the other two opposite moving rods to move away from each other, welding a support rod on the upper half section of each moving rod to extend out of the grouting steel pipe and the steel reinforcement cage, fixing the other two opposite moving rods, filling gravel filler into a space pipe between the sleeve and the steel reinforcement cage again, vibrating the sleeve by using a vibrating pile driver, gradually pulling out the sleeve, tamping the gravel filler by using a tamping hammer, and extruding and compacting the steel reinforcement meshes and soil around the pile hole;
s6, pouring concrete grout into the grouting steel pipe, enabling the concrete grout to flow out of a space between the reinforcement cage and the reinforcement meshes through the grout outlet, and forming the gravel pile after the concrete grout is solidified;
s7, after the gravel pile in S6 is checked to be qualified, the top of the grouting steel pipe is fixedly sleeved with a positioning ring arranged on the grouting steel pipe, two adjacent positioning rings fixed on a reinforcement cage are connected through a connecting pipe, a buckling piece is unlocked, a supporting block is pushed by a push rod arranged in the connecting pipe, the supporting block moves outwards and abuts against the positioning ring, an anchor rod penetrates through the push rod and the connecting pipe and is anchored on the ground, a plurality of gravel piles are connected into a whole, and a layer of gravel filler is paved at the top of the gravel pile to form a 20cm gravel cushion layer and is compacted to form the required gravel pile composite foundation.
In summary, the invention includes at least one of the following beneficial technical effects:
1. additionally arranging a steel reinforcement cage in the sleeve, additionally arranging a grouting steel pipe in the steel reinforcement cage, additionally arranging a plurality of supporting rods extending out of the grouting steel pipe and the steel reinforcement cage in the grouting steel pipe, arranging grout outlet holes in the side wall of the grouting steel pipe, and pouring concrete grout into the grout outlet holes, so that the concrete grout flows out between the sleeve and the steel reinforcement cage through the grout outlet holes, further reducing gaps among gravel fillers, enhancing the bonding force among the gravel fillers and further enhancing the bearing capacity of the gravel pile foundation;
2. the limiting convex strips and the limiting grooves are matched in a sliding mode to play a limiting role, so that the grouting steel pipe is not prone to rotating and shifting when being placed into the steel reinforcement cage, and the grouting steel pipe is convenient for construction personnel to place into the steel reinforcement cage;
3. the arrangement of the connecting pipes can enhance the connecting force between two adjacent gravel piles, so that the foundation is reinforced;
4. the stock runs through first perforation in proper order and the second is worn and anchor and foundation soil layer in, has played the supporting role to the connecting pipe to the stability of reinforcing connecting pipe in foundation soil layer.
Drawings
FIG. 1 is a schematic structural view of a composite foundation of the present invention;
FIG. 2 is a schematic structural view of a single granular stone column of the present invention;
FIG. 3 is a schematic structural view of a grouted steel pipe of the present invention;
FIG. 4 is an enlarged view of portion A of FIG. 3 of the present invention;
FIG. 5 is an enlarged view of portion B of FIG. 3 of the present invention
FIG. 6 is a schematic view of a portion of the reinforcement cage of the present invention;
fig. 7 is a sectional view of the connecting tube of the present invention.
In the figure, 1, a foundation soil layer; 2. pile holes; 3. a sleeve; 4. reinforcing mesh sheets; 5. filling crushed stone; 6. a reinforcement cage; 61. a steel bar ring; 62. a steel bar vertical rod; 7. a barb; 8. grouting a steel pipe; 9. a slurry outlet; 10. limiting convex strips; 11. a guide convex strip; 12. a limiting groove; 13. a strut; 14. a travel bar; 15. a guide bar; 16. a guide ring; 17. a positioning ring; 18. positioning a plate; 19. a first bolt; 20. a through hole; 21. a connecting pipe; 22. a fixing hole; 23. a support block; 24. a butting block; 25. a push rod; 26. a spring; 27. shifting blocks; 28. a through groove; 29. an anchor rod; 30. a first perforation; 31. a second perforation; 32. a second bolt; 33. connecting holes; 34. grouting grooves; 35. pricking a tip part; 36. and (7) installing holes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, the roadbed foundation gravel pile composite foundation structure and the construction method thereof disclosed by the invention comprise a foundation soil layer 1 and a plurality of gravel piles arranged in the foundation soil layer 1, wherein each gravel pile comprises a sleeve 3 for filling gravel filler 5 to form a pile body. Digging out pile hole 2 of required degree of depth in foundation soil layer 1 earlier, when sleeve pipe 3 is squeezed into pile hole 2, laminate in sleeve pipe 3 inside wall circumference and placed reinforcing bar net piece 4 to reduce the skew of gravel pile and warp, fill rubble filler 5, progressively pull out the pipe, utilize the rammer to tamp many times, density repeatedly shakes, in order to form the gravel pile. And paving a layer of gravel filler 5 on the top of the gravel pile to form a 20cm gravel cushion layer, so that the gravel pile, the reinforced foundation soil and the gravel cushion layer form a composite foundation.
In order to enhance the bearing strength of the gravel pile composite foundation, a reinforcement cage 6 is placed in the sleeve 3, the diameter of the reinforcement cage 6 is smaller than that of the sleeve 3, and the reinforcement cage 6 is arranged along the length direction of the sleeve 3. Reinforcing bar cage 6 and the coaxial setting of sleeve pipe 3, in this embodiment, reinforcing bar cage 6 comprises a plurality of reinforcing bar rings 61 and many reinforcing bar montants 62, and a plurality of reinforcing bar rings 61 set up along sheathed tube 3's length direction, and many reinforcing bar montants 62 weld with each reinforcing bar ring 61 in proper order along a plurality of reinforcing bar rings 61's distribution direction, and many reinforcing bar montants 62 are along reinforcing bar rings 61's circumference direction equidistance welded fastening. In addition, 6 bottoms of steel reinforcement cage are provided with many barbs 7, and many barbs 7 set up along the reinforcing bar ring 61 circumference of contradicting with 2 hole bottoms in stake hole, and during the earth of 2 hole bottoms in stake hole was inserted to many barbs 7, strengthened steel reinforcement cage 6 grab ground intensity to make steel reinforcement cage 6 fix in sleeve pipe 3.
Referring to fig. 3 and 4, simultaneously, install grout steel pipe 8 in the steel reinforcement cage 6, grout steel pipe 8 sets up along the length direction of steel reinforcement cage 6, and has seted up grout groove 34 on the grout steel pipe 8, and grout groove 34 sets up along the length direction of grout steel pipe 8 from the one end that grout steel pipe 8 kept away from 2 hole bottoms in stake hole. A plurality of grout outlet holes 9 are formed in the circumferential direction of the side wall of the grouting steel pipe 8, and the grout outlet holes 9 are used for pouring concrete grout. The plurality of grout outlet holes 9 form four rows, and the grout outlet holes 9 of each row are arranged along the length direction of the grouting steel pipe 8. The inboard equal circumference welding of each reinforcing bar ring 61 in steel reinforcement cage 6 has the spacing sand grip 10 of a plurality of, and in this embodiment, the quantity of spacing sand grip 10 is four. Correspondingly, the outer side wall of the grouting steel pipe 8 is welded with guide convex strips 11 corresponding to the limit convex strips 10 welded on the reinforcing steel bar circular rings 61, each guide convex strip 11 is respectively positioned between two adjacent rows of grout outlet holes 9, and the guide convex strips 11 are arranged along the length direction of the grouting steel pipe 8. Spacing groove 12 has been seted up on the side surface that direction sand grip 11 deviates from grout steel pipe 8, and spacing groove 12 runs through the setting along the length direction of direction sand grip 11, and spacing sand grip 10 slides the cooperation with the spacing groove 12 that corresponds to carry on spacingly to grout steel pipe 8, make grout steel pipe 8 difficult skew when placing steel reinforcement cage 6 in walk the position. In addition, the one end circumference welding that grout steel pipe 8 is close to 2 hole bottoms in stake hole has many thorn point portion 35 that are coniform setting, and thorn point portion 35 inserts in the earth of 2 hole bottoms in stake hole to reinforcing grout steel pipe 8 grabs ground ability, make grout steel pipe 8 and 2 hole bottoms in stake hole fixed.
Referring to fig. 2 and 3, a plurality of movable rods 14 are arranged in the grouting steel pipe 8, the number of the movable rods 14 is four, the four movable rods 14 are all arranged along the length direction of the grouting steel pipe 8, and one end of each movable rod 14 extends out of the grouting steel pipe 8. A plurality of struts 13 are welded to the side wall of the moving rod 14, and the plurality of struts 13 are arranged along the length direction of the moving rod 14. Each of the moving bars 14 includes an upper half and a lower half, and the plurality of struts 13 welded to the two moving bars 14 are located at the upper half of the corresponding moving bar 14, and the struts 13 welded to the other two moving bars 14 are located at the lower half of the corresponding moving bar 14. The lateral wall circumference of grout steel pipe 8 is seted up and is supplied branch 13 to stretch out the outer through-hole 20 of grout steel pipe 8 and steel reinforcement cage 6, and through-hole 20 is the setting of running through. The supporting rods 13 extend out of the grouting steel pipe 8 and the reinforcement cage 6 through the through holes 20, and one end, far away from the moving rod 14, of each supporting rod 13 abuts against the inner side of the reinforcement mesh 4, so that the supporting strength of the gravel pile is enhanced, and the deformation of the gravel pile is reduced. It is worth mentioning that a space for each strut 13 to extend out of the reinforcement cage 6 is reserved on the reinforcement cage 6. In addition, in order to make the support rod 13 not easily deviate in the pushing process, a guide assembly for guiding the moving rod 14 is arranged between the grouting steel pipe 8 and each moving rod 14, and the guide assembly comprises a guide ring 16 and a guide rod 15. The guide rods 15 and the guide rings 16 are located at one end, close to the bottom of the grouting groove 34, of the grouting steel pipe 8, the guide rings 16 and the movable rod 14 are welded at one end, close to the bottom of the grouting groove 34, of the grouting steel pipe, one end of each guide assembly group of the guide rods 15 is welded and fixed with the inner side wall of the grouting steel pipe 8, the other ends of the guide rods 15 in each guide assembly group are welded and fixed with each other, and the guide rings 16 are sleeved on the corresponding guide rods 15 in a sliding fit mode. During construction, a hydraulic cylinder can be hoisted into the grouting steel pipe 8 by utilizing a crane, so that the movable rod 14 is pushed to move, the guide ring 16 is in sliding fit with the guide rod 15, the movable rod 14 is guided, and the movable rod 14 is not easy to shift and move.
Referring to fig. 3 and 5, two positioning plates 18 are arranged at the top of the grouting steel pipe 8, mounting holes for the moving rod 14 to pass through are formed in two sides of the two positioning plates 18, and a fastener for fixing the positioning plates 18 is arranged between two sides of the two positioning plates 18 and the grouting steel pipe 8, wherein the fastener is a first bolt 19 in this embodiment. When the support rod 13 located at the lower half section of the two opposite moving rods 14 is pushed out to the top of the grouting steel tube 8 and the steel reinforcement cage 6, one positioning plate 18 is sleeved on the two opposite moving rods 14 through the mounting hole, one side surface of one positioning plate 18 facing the grouting groove 34 is abutted to the top of the grouting steel tube 8, and the first bolt 19 penetrates through the positioning plate 18 and is in threaded connection with the top of the grouting steel tube 8. The space between the sleeve 3 and the reinforcement cage 6 can be filled with gravel filler 5, and the gravel filler 5 is tamped by a rammer. When the support rod 13 located at the upper half section of the two opposite moving rods 14 is pushed out to the grouting steel tube 8 and the reinforcement cage 6, the other positioning plate 18 is sleeved on the other two opposite moving rods 14 through the mounting hole 36, and the other positioning plate 18 abuts against the surface of one side of the positioning plate 18 departing from the grouting groove 34, at this time, the first bolt 19 connects the other positioning plate 18 with the grouting steel tube 8 through threads. And putting the gravel filler 5 again, tamping, compacting, pouring concrete slurry into the grouting steel pipe 8, and forming and solidifying the concrete slurry to form the required gravel pile.
Referring to fig. 1 and 2, for reinforcing gravel pile composite foundation bulk strength to make two adjacent gravel piles can connect more stably, each 8 tops of grout steel pipe are all overlapped and are equipped with holding ring 17, and holding ring 17 circumference is provided with many second bolts 32, and many second bolts 32 run through holding ring 17 and the lateral wall threaded connection of grout steel pipe 8. Be connected with connecting pipe 21 between two adjacent holding rings 17, all set up the fixed orifices 22 that run through the setting between two adjacent holding rings 17, in the fixed orifices 22 that two adjacent holding rings 17 correspond were passed respectively at the both ends of connecting pipe 21 and stretched into holding ring 17, every three connecting pipes 21 can form an equilateral triangle this moment, connect from this to two adjacent rubble stakes and consolidate.
Referring to fig. 7, in order to fix the connection pipe 21 in the two adjacent positioning rings 17 and make it hard to loosen, the connection pipe 21 is horizontally disposed and hollow, and two ends of the connection pipe 21 are closed ends. The two sides of the connecting pipe 21 extending into the corresponding positioning ring 17 are provided with two supporting blocks 23, and the two supporting blocks 23 are located in the connecting pipe 21 and located at two ends of the connecting pipe 21 in the diameter direction respectively. Meanwhile, the side wall of the connecting pipe 21 is provided with a connecting hole 33 for each supporting block 23 to extend out of the connecting pipe 21. Two push rods 25 for pushing the supporting blocks 23 at the two sides of the connecting pipe 21 to extend out of the connecting pipe 21 are arranged in the connecting pipe 21, the two push rods 25 deviate and move in the connecting pipe 21, each supporting block 23 extends out of the connecting hole 33, and one side surface of the supporting block 23 close to the positioning ring 17 is in abutting connection with the inner side wall of the positioning ring 17. In addition, in order to prevent the supporting blocks 23 from falling off from the connecting holes 33, an abutting block 24 for limiting the position of the supporting block 23 is welded to one end of each supporting block 23 located in the connecting pipe 21. In order to facilitate the push rod 25 to push the abutting support block 23, a tip end arranged in a conical shape is arranged at one end of the push rod 25 close to the support block 23, and a guide surface with the same gradient as the tip end is arranged at one end of each abutting block 24 close to the support block 23.
Referring to fig. 7, an elastic member is connected between two opposite ends of the two push rods 25, in this embodiment, the elastic member is a spring 26, and two ends of the spring 26 are fixedly connected to two opposite side surfaces of the two push rods 25, respectively. A shifting block 27 is welded on one side wall of each push rod 25, a through groove 28 corresponding to each shifting block 27 is formed on the side wall of the connecting pipe 21, and each through groove 28 is arranged along the length direction of the connecting pipe 21. The shifting block 27 runs through the through groove 28 and is connected with the extending connecting pipe 21 in a sliding manner, a buckling piece used for fixing the shifting block 27 is arranged between the two shifting blocks 27, the buckling piece is an elastic buckle (not shown in the figure) arranged in a U shape, when the two shifting blocks 27 are abutted to a groove wall of the through groove 28 far away from the supporting block 23, the elastic buckle and the two shifting blocks 27 are buckled, the two shifting blocks 27 are buckled and fixed, and the supporting block 23 can be retracted into the connecting pipe 21, so that a constructor can conveniently construct. When the supporting block 23 needs to extend out of the connecting pipe 21, the elastic buckle is only needed to be taken down, the two push rods 25 automatically move under the action of the spring 26, when the tip ends of the push rods 25 abut against the closed end of the connecting pipe 21, the push rods 25 stop moving, the spring 26 is in a natural state, and at the moment, the supporting block 23 extends out of the connecting pipe 21.
Referring to fig. 1 and 7, in addition, anchor rods 29 are arranged on two sides of the connecting pipe 21, a first through hole 30 penetrating the connecting pipe 21 is formed in each push rod 25, a second through hole 31 penetrating the connecting pipe 21 is formed in the side wall of the connecting pipe, when the elastic element is in a natural state, the push rod 25 is pushed by the spring 26, the supporting block 23 extends outwards, the first through hole 30 is aligned with the second through hole 31, the anchor rods 29 are sequentially arranged on the first through hole 30 and the second through hole 31 and anchored on the foundation soil layer 1, so that the connecting pipe 21 is further fixed in two adjacent positioning rings 17, and the overall connection force of the gravel pile composite foundation is enhanced.
A roadbed foundation gravel pile composite foundation construction method comprises the following steps:
s1, preparing a plurality of vibrating pile drivers and hopper cars, cleaning soil on the ground, pushing out surface weeds, rotten soil or planting soil by using the bulldozer, removing sundries such as tree roots and grass roots, flattening and compacting the ground, placing a pile position in a construction range, making construction technology for crossing bottoms (including the situations of pile length, pile position arrangement and the like), digging a gravel pile at the pile position by the needed depth to form a pile hole 2, transporting the abandoned soil to a specified position by using the hopper cars, and selecting weatherless gravel, chippings and stone chippings according to the needed requirements to form a filler according to the mixing ratio;
s2 and ZCQ55 vibration drivers are put in place, the sleeve 3 is aligned to the pile hole 2, the vibration drivers are started to drive the sleeve 3 into the pile hole 2, the steel bar net 4 is hung into the sleeve 3 by a crane, the steel bar cage 6 is fixed in the sleeve 3 and is arranged coaxially with the sleeve 3, and a grouting steel pipe 8 is placed into the steel bar cage 6;
s3, pushing the two moving rods 14 to move the two moving rods 14 away from each other, enabling the support rods 13 welded on the lower half sections of the two moving rods 14 to extend out of the grouting steel tube 8 and the reinforcement cage 6, sleeving the positioning plate 18 on the two moving rods 14 through the mounting holes 36, fixing the positioning plate 18 on the top of the grouting steel tube 8 by using the first bolts 19, filling matched ingredients in the space between the sleeve 3 and the reinforcement cage 6 in S1, enabling the ingredient stacking height to be higher than the height of the support rod 13 farthest from the bottom of the pile hole 2 and the bottom of the pile hole 2, vibrating the sleeve 3 by using a vibrating pile driver, gradually pulling out the pipe while vibrating, controlling the pipe pulling speed within the range of 0.8-1.0 m/min, lifting to a certain height (generally more than 2.0 m) by using a rammer, freely dropping the gravel filler 5 poured in the sleeve 3, ramming for multiple times, and enabling the ingredients to be tamped, Vibrating and compacting;
s4, pushing the other two opposite moving rods 14 to enable the other two opposite moving rods 14 to move away from each other, sleeving the other two opposite moving rods 14 through mounting holes according to a support rod 13 welded on the upper half sections of the two moving rods 14 and extending out of the grouting steel pipe 8 and the reinforcement cage 6, fixing the other positioning plate 18 by using a second bolt 32, filling gravel fillers 5 into a space pipe between the sleeve 3 and the reinforcement cage 6 again, vibrating the sleeve 3 by using a vibrating pile driver, gradually pulling out the sleeve, tamping the gravel fillers 5 by using a tamping hammer, and extruding and compacting the reinforcement meshes 4 and soil around the pile hole 2;
s6, pouring concrete grout into the grouting steel pipe 8, enabling the concrete grout to flow out of the grout outlet 9 to a space between the reinforcement cage 6 and the reinforcement mesh 4, and forming a gravel pile after the concrete grout is solidified;
s7, after the gravel pile in the S6 is checked to be qualified, fixing a positioning ring 17 which is sleeved on the grouting steel pipe 8 at the top of the grouting steel pipe 8 by using a second bolt 32, connecting two adjacent positioning rings 17 which are fixed on the steel reinforcement cage 6 by using a connecting pipe 21, unlocking an elastic buckle which is arranged on the connecting pipe 21, enabling a push rod 25 which is arranged in the connecting pipe 21 to push a supporting block 23, enabling the supporting block 23 to move outwards and abut against the positioning ring 17, enabling an anchor rod 29 to penetrate through the push rod 25 and the connecting pipe 21 and be anchored on the ground, enabling a plurality of gravel piles to be connected into a whole, and laying a layer of gravel on the top of each gravel pile to form a 20cm gravel cushion layer so as to form the required gravel pile composite.
The implementation principle of the embodiment is as follows: add steel reinforcement cage 6 in sleeve pipe 3, can strengthen the bearing capacity of gravel pile, add grout steel pipe 8 in steel reinforcement cage 6 simultaneously, promote carriage release lever 14 and make branch 13 stretch out outside grout steel pipe 8 and steel reinforcement cage 6, support intensity between with increase sleeve pipe 3 and steel reinforcement cage 6, grout outlet 9 is seted up at grout steel pipe 8 lateral wall simultaneously, pour into the concrete thick liquid to grout outlet 9, make the concrete thick liquid flow to the space between sleeve pipe 3 and the steel reinforcement cage 6 through grout outlet 9, with the space that reduces gravel filler 5, and simultaneously, connecting pipe 21 is connected between the holding ring 17 between two adjacent gravel piles, can reduce the settlement and the deformation of gravel pile, consolidate the gravel pile foundation from this, with the bearing capacity of reinforcing gravel pile composite foundation.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a roadbed basement gravel pile composite foundation structure, includes foundation soil layer (1) and a plurality of sets up the gravel pile in foundation soil layer (1), its characterized in that: the gravel pile foundation structure is characterized in that a pile hole (2) for accommodating the gravel pile is formed in the foundation soil layer (1), each gravel pile comprises a sleeve (3) for filling gravel filler (5) to form a pile body, a reinforcement cage (6) is arranged in the sleeve (3), the reinforcement cage (6) and the pile hole (2) are coaxially arranged, a grouting steel pipe (8) is arranged in the reinforcement cage (6), a plurality of grout outlet holes (9) for pouring concrete grout are formed in the side wall of the grouting steel pipe (8), four moving rods (14) are arranged in the grouting steel pipe (8), the four moving rods (14) are arranged along the length direction of the grouting steel pipe (8), a plurality of supporting rods (13) are arranged on the supporting rods (13) along the length direction corresponding to the moving rods (14), and each moving rod (14) comprises an upper half section and a lower half section, set up two many on the carriage release lever (14) branch (13) are located the first half section of carriage release lever (14) sets up two in addition many on carriage release lever (14) branch (13) are located the second half section of carriage release lever (14), the lateral wall of grout steel pipe (8) be provided with a plurality of with through-hole (20) that branch (13) correspond, carriage release lever (14) promote, each branch (13) run through-hole (20) and steel reinforcement cage (6) stretch out outside steel reinforcement cage (6).
2. The subgrade-base gravel pile composite foundation structure of claim 1, which is characterized in that: a guide assembly is arranged between each moving rod (14) and the grouting steel pipe (8), the guide assembly comprises a guide ring (16) and a guide rod (15), the guide rod (15) is arranged on the grouting steel pipe (8), the guide ring (16) is connected to one end, close to the bottom of the pile hole (2), of the moving rod (14), and the guide ring (16) is sleeved on the guide rod (15) and is in sliding fit with the guide rod (15).
3. The subgrade-base gravel pile composite foundation structure of claim 1, which is characterized in that: reinforcing cage (6) inboard is provided with a plurality of spacing sand grips (10), a plurality of spacing sand grip (10) are followed the length direction in reinforcing bar hole sets up, the lateral wall of grout steel pipe (8) is provided with direction sand grip (11), direction sand grip (11) deviate from a side surface of grout steel pipe (8) is provided with each spacing groove (12) that spacing sand grip (10) correspond, just spacing groove (12) are certainly grout steel pipe (8) insert the one end of reinforcing cage (6) is followed the length direction of direction sand grip (11) runs through the setting, spacing sand grip (10) and corresponding spacing groove (12) cooperation of sliding.
4. The subgrade-base gravel pile composite foundation structure of claim 1, which is characterized in that: each grout steel pipe (8) top is connected with holding ring (17), adjacent two be connected with connecting pipe (21) between holding ring (17), connecting pipe (21) are the cavity setting, just the both ends of connecting pipe (21) are the blind end, adjacent two be provided with between holding ring (17) a plurality of with fixed orifices (22) that connecting pipe (21) correspond, adjacent two are passed respectively at the both ends of connecting pipe (21) holding ring (17) correspond fixed orifices (22) just stretch into in holding ring (17), the both ends of connecting pipe (21) with all be provided with between locating plate (18) and be used for fixed connection pipe (21) butt subassembly in holding ring (17).
5. The subgrade-base gravel pile composite foundation structure of claim 4, which is characterized in that: the butt joint component comprises two supporting blocks (23), the two supporting blocks (23) are respectively located at two ends of the connecting pipe (21) in the diameter direction, connecting holes (33) for the supporting blocks (23) to extend out of the connecting pipe (21) are formed in the side wall of the connecting pipe (21), two push rods (25) used for pushing the supporting blocks (23) on two sides of the connecting pipe (21) to extend out of the connecting pipe (21) are arranged in the connecting pipe (21), the two push rods (25) move in a deviating mode in the connecting pipe (21), an elastic part is connected between the two push rods (25), and when the elastic part is in a natural state, the supporting blocks (23) extend out of the corresponding connecting holes (33) and are connected with the inner side wall of the positioning ring (17) in a butting mode.
6. The subgrade-base gravel pile composite foundation structure of claim 5, which is characterized in that: each push rod (25) is provided with a shifting block (27), the side wall of the connecting pipe (21) is provided with a through groove (28) corresponding to the shifting block (27), the through groove (28) is arranged along the length direction of the connecting pipe (21), the shifting block (27) penetrates through the through groove (28) and extends out of the connecting pipe (21), the shifting block (27) is connected with the through groove (28) in a sliding manner, when the shifting block (27) is abutted to the groove wall of the through groove (28) far away from the supporting block (23), and a buckling piece for buckling the two shifting blocks (27) is arranged between the two shifting blocks (27).
7. The subgrade-base gravel pile composite foundation structure of claim 5, which is characterized in that: the two sides of the connecting pipe (21) are provided with anchor rods (29), each push rod (25) is provided with a first through hole (30), the side wall of the connecting pipe (21) is provided with a second through hole (31) which penetrates through the connecting pipe, and when the elastic piece is in a natural state, the anchor rods (29) are sequentially provided with the first through holes (30) and the second through holes (31) and are anchored on the foundation soil layer (1).
8. The subgrade-base gravel pile composite foundation structure of claim 5, which is characterized in that: one end of each supporting block (23) positioned in the connecting pipe (21) is connected with an abutting block (24) used for limiting the position of the supporting block (23).
9. The subgrade-base gravel pile composite foundation structure of claim 1, which is characterized in that: and a steel bar mesh (4) is arranged on the inner side wall of the sleeve (3) in the circumferential direction.
10. The roadbed-base gravel pile composite foundation construction method according to any one of claims 1 to 9, wherein: the method comprises the following construction steps:
s1, cleaning soil on the ground, pushing the ground flat and compacting, placing a pile position in a construction range, making construction technology bottom crossing (including the situations of pile length, pile position arrangement and the like), digging a gravel pile at the pile position to a required depth to form a pile hole (2), transporting the abandoned soil to a specified position by a trolley, and selecting weatherless gravel, chips and stone chips according to required requirements to form a gravel filler (5) according to a mixing ratio;
s2 and ZCQ55 vibration pile drivers are in place, the sleeve (3) is aligned to the pile hole (2), the vibration pile drivers are started to drive the sleeve (3) into the pile hole (2), a crane steel bar net piece (4) is used for being hung into the sleeve (3), the steel bar cage (6) is fixed in the sleeve (3) and is arranged coaxially with the sleeve (3), and a grouting steel pipe (8) is placed into the steel bar cage (6);
s3, pushing two moving rods (14), making the two moving rods (14) move away from each other, making the support rods (13) welded on the lower half sections of the two moving rods (14) extend out of the grouting steel pipe (8) and the reinforcement cage (6), fixing the two moving rods (14), filling the matched broken stone filler (5) in the space between the sleeve (3) and the reinforcement cage (6) in the S1, making the pile height of the broken stone filler (5) higher than the height of the support rod (13) farthest from the bottom of the pile hole (2) and the bottom of the pile hole (2), vibrating the sleeve (3) by using a vibration pile driver, gradually pulling out the pipe while vibrating, controlling the pipe pulling speed within the range of 0.8-1.0 m/min, using a rammer to lift to a certain height (generally above 2.0 m), freely falling down and impacting the broken stone filler (5) in the sleeve (3), ramming for multiple times, tamping and vibrating the ingredients;
s4, pushing the other two opposite moving rods (14) to enable the other two opposite moving rods (14) to move away from each other, enabling the support rods (13) welded to the upper half sections of the two moving rods (14) to extend out of the grouting steel pipe (8) and the reinforcement cage (6), fixing the other two opposite moving rods (14), filling gravel fillers (5) into a space pipe between the sleeve (3) and the reinforcement cage (6), vibrating the sleeve (3) by a vibrating pile driver, gradually pulling out the sleeve, tamping the gravel fillers (5) by a tamping hammer, and extruding and compacting the reinforcing mesh (4) and soil around the pile hole (2);
s6, pouring concrete slurry into the grouting steel pipe (8), enabling the concrete slurry to flow out to a space between the reinforcement cage (6) and the reinforcement mesh (4) through the slurry outlet hole (9), and forming a gravel pile after the concrete slurry is solidified;
s7, after the gravel pile in the S6 is checked to be qualified, fixing a positioning ring (17) which is sleeved on the grouting steel pipe (8) at the top of the grouting steel pipe (8), connecting two adjacent positioning rings (17) which are fixed on the steel reinforcement cage (6) by using a connecting pipe (21), unlocking a buckling piece, enabling a push rod (25) installed in the connecting pipe (21) to push a supporting block (23), enabling the supporting block (23) to move outwards and abut against the positioning ring (17), penetrating an anchor rod (29) through the push rod (25) and the connecting pipe (21) and anchoring the anchor rod on the ground, enabling a plurality of gravel piles to be connected into a whole, paving a layer of gravel at the top of the gravel pile to form a 20cm gravel cushion layer and compacting the gravel cushion layer to form the required composite foundation.
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| CN202010703221.0A CN111749066A (en) | 2020-07-18 | 2020-07-18 | Roadbed base gravel pile composite foundation structure and construction method |
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| CN112627158A (en) * | 2020-12-06 | 2021-04-09 | 唐建厚 | Pressure-resistant highway subgrade gravel pile |
| CN112627159A (en) * | 2020-12-06 | 2021-04-09 | 唐建厚 | Pressure-resistant highway subgrade gravel pile vibration-impact-resistant outer protection structure and using method thereof |
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| CN112627158A (en) * | 2020-12-06 | 2021-04-09 | 唐建厚 | Pressure-resistant highway subgrade gravel pile |
| CN112627159A (en) * | 2020-12-06 | 2021-04-09 | 唐建厚 | Pressure-resistant highway subgrade gravel pile vibration-impact-resistant outer protection structure and using method thereof |
| CN112854279A (en) * | 2021-01-19 | 2021-05-28 | 万晟建设集团有限公司 | Combined pile for foundation engineering and preparation method thereof |
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| CN114108590A (en) * | 2021-11-30 | 2022-03-01 | 深圳市蛇口招商港湾工程有限公司 | Port silt foundation consolidation structure and construction method |
| CN116791422A (en) * | 2023-08-28 | 2023-09-22 | 创辉达设计股份有限公司 | Expressway roadbed structure suitable for soft soil stratum and construction method thereof |
| CN116791422B (en) * | 2023-08-28 | 2023-11-07 | 创辉达设计股份有限公司 | Expressway roadbed structure suitable for soft soil stratum and construction method thereof |
| CN117988317A (en) * | 2024-03-29 | 2024-05-07 | 中铁城建集团第一工程有限公司 | Gravel pile and construction process thereof |
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