CN112177027A - Pile foundation structure and construction method thereof - Google Patents
Pile foundation structure and construction method thereof Download PDFInfo
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- CN112177027A CN112177027A CN202011074041.7A CN202011074041A CN112177027A CN 112177027 A CN112177027 A CN 112177027A CN 202011074041 A CN202011074041 A CN 202011074041A CN 112177027 A CN112177027 A CN 112177027A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/04—Guide devices; Guide frames
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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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- Piles And Underground Anchors (AREA)
Abstract
The application relates to a pile foundation structure and a construction method thereof, wherein the pile foundation structure comprises a steel casing and a pile body, a reinforcement cage is arranged in the pile body, and a fixed cylinder is arranged at the bottom of the reinforcement cage; a plurality of movable holes are formed in the side wall of the fixed cylinder; a positioning device is arranged in the fixed cylinder; the positioning device comprises a fixed column arranged in the reinforcement cage and a fixed rod which is arranged on the fixed column and is horizontally arranged; a plurality of fixed rods are arranged at intervals along the circumferential direction of the fixed column; the inner side wall of the fixed cylinder is provided with a positioning ring sheet; the upper end surface of the positioning ring is provided with a plurality of sliding chutes; the positioning ring is provided with an inserted rod in a sliding way; a plurality of inserting rods are arranged along the circumferential direction of the positioning ring piece; the lower end surface of the inserted bar is provided with a slide block which is arranged in the chute in a sliding way; one end of the inserted link is inserted in the movable hole; the one end that the inserted bar is close to the dead lever articulates there is the connecting rod, and the one end that the inserted bar was kept away from to the connecting rod is articulated with dead lever lower terminal surface. This application has the effect that improves steel reinforcement cage installation stability.
Description
Technical Field
The application relates to the field of pile foundation engineering technology, in particular to a pile foundation structure and a construction method thereof.
Background
The pile foundation is a deep foundation consisting of piles and pile bearing platforms connected with the pile tops or a single pile foundation connected with the pile foundation through columns. Pile foundations are important components in construction engineering and are also the foundation for the entire ground construction.
The existing Chinese patent with publication number CN109235442A discloses a pile foundation construction platform, which includes a clamping disk and a clamping plate, wherein the clamping disk is provided with a through hole for a reinforcement cage to pass through and guide grooves distributed around the through hole and extending along the radial direction of the through hole, the guide grooves respectively form an inner socket and an outer socket at the edge of the through hole and the outer edge of the clamping disk, the clamping plate is inserted into the guide grooves through the outer socket and can slide along the guide grooves, and when the reinforcement cage passes through the through hole, the clamping plate extends out of the guide grooves through the inner socket and is inserted into a cage hole of the reinforcement cage, so as to fix the reinforcement cage.
To the correlation technique among the above-mentioned, the inventor thinks that the steel reinforcement cage places in the downthehole back of stake, when pouring, the steel reinforcement cage is placed unstably, leads to the steel reinforcement cage slope easily, influences construction quality.
Disclosure of Invention
In order to improve the installation stability of the steel reinforcement cage in the pile hole, the application provides a pile foundation structure and a construction method thereof.
In a first aspect, the present application provides a pile foundation structure adopts following technical scheme:
a pile foundation structure comprises a steel casing arranged in a pile hole, wherein a cast-in-place pile body is poured in the steel casing, a reinforcement cage is arranged in the pile body, and a fixing cylinder is arranged at the bottom of the reinforcement cage; a plurality of movable holes are formed in the side wall of the fixed cylinder; a positioning device is arranged in the fixed cylinder; the positioning device comprises a fixed column arranged in the reinforcement cage and a fixed rod which is arranged on the fixed column and is horizontally arranged; the fixing column and the reinforcement cage are coaxially arranged; a plurality of fixed rods are arranged at intervals along the circumferential direction of the fixed column; a positioning ring piece is arranged on the inner side wall of the fixed cylinder; the upper end surface of the positioning ring piece is provided with a plurality of sliding grooves; one end of the sliding chute extension line penetrates through the movable hole, and the other end of the sliding chute extension line penetrates through the axis of the fixed column; the positioning ring is provided with an inserted rod in a sliding manner; a plurality of inserting rods are arranged along the circumferential direction of the positioning ring piece, and the plurality of inserting rods and the plurality of fixing rods are arranged in a one-to-one correspondence manner; the lower end face of the inserted bar is provided with a sliding block, and the sliding block is arranged in the sliding groove in a sliding manner; one end of the inserted link is inserted into the movable hole; the one end that the inserted bar is close to the dead lever articulates there is the connecting rod, and the one end that the inserted bar was kept away from to the connecting rod is articulated with the lower terminal surface of dead lever.
Through adopting above-mentioned technical scheme, place the steel reinforcement cage in the stake hole, through the hammering fixed column for the fixed column is pegged graft in the hole bottom in stake hole, fixes a position the steel reinforcement cage. In the process that the fixed column moves downwards, the fixed rod is driven to move downwards, so that one end of the fixed rod driving the push rod penetrates through the movable hole and is inserted into the hole wall of the pile hole, the steel reinforcement cage is further positioned, the installation of the steel reinforcement cage is more stable and reliable, the steel reinforcement cage is not prone to shifting, and the quality of a pile body formed after concrete is poured subsequently can be improved.
Preferably, the upper end surface of the fixed rod is provided with a vertical limiting rod; a guide pipe is sleeved on the fixing column in the circumferential direction; the guide pipe and the fixing column are coaxially arranged; the lower end surface of the guide pipe is abutted against the fixed rod.
Through adopting above-mentioned technical scheme, peg graft the fixed column in the hole bottom in stake hole after for the lower extreme of dead lever keeps certain distance with the hole bottom in stake hole, installs the stand pipe after the steel reinforcement cage is installed, makes the stand pipe can conveniently lead concrete placement. The fixed rod can drive the inserted rod to be inserted into the inner side wall of the pile hole and can position the guide pipe, so that the interval between the lower end of the guide pipe and the bottom of the pile hole is 0.3-0.5m, and concrete can flow out conveniently. The guide pipe is more convenient and rapid to hoist, and the construction efficiency is improved.
Preferably, a limiting piece is arranged at the upper end of the fixing column; the limiting piece comprises a first limiting ring fixed on the fixing column and a second limiting ring arranged at an interval with the first limiting ring; a bar-shaped rod is connected between the first limiting ring and the second limiting ring; a plurality of connecting rods are arranged at intervals along the circumferential direction of the first limiting ring; the second limiting ring is attached to the inner side wall of the guide pipe.
Through adopting above-mentioned technical scheme, set up the locating part in the upper end of fixed column, can further improve spacing to the direction of stand pipe for the lower extreme of stand pipe can overlap joint in the up end of dead lever accurately. When concreting, the space between first spacing ring, second spacing ring and the bar pole can make the concrete flow to the below, can support the stand pipe, can keep steadily when concreting.
Preferably, the reinforcement cage is formed by uniformly arranging a plurality of vertical reinforcements in a ring shape; a plurality of first annular steel bars are arranged on the outer side of the vertical steel bars at intervals from top to bottom; reinforcing ribs are arranged on the vertical reinforcing steel bars; the number of the reinforcing ribs is three, and the end parts of every two reinforcing ribs are fixedly connected to form a triangular supporting frame; the end part of the support frame is fixedly connected with the vertical steel bar; the outer side wall of the guide pipe is abutted to the inner side wall of the reinforcing rib.
Through adopting above-mentioned technical scheme, set up the strengthening rib, can fix the upper end of steel reinforcement cage, improve the support to steel reinforcement cage upper portion for the steel reinforcement cage can remain stable state. The stand pipe is installed in the downthehole back of stake, and the inside wall of strengthening rib and the laminating of the lateral wall of stand pipe can further improve the installation stability to the stand pipe, when subsequent concreting for it is more stable to hang ground on the stand pipe.
Preferably, the bottom of the fixed cylinder is provided with a fixed ring; the fixing ring and the reinforcement cage are coaxially arranged; the outer side wall of the fixing ring is fixedly connected with the inner side wall of the fixing cylinder through a cross rod; the inner side wall of the fixing ring is provided with a butting ring; the lower end of the fixed column is provided with a butting block; the butt joint block is in a round table shape, and the large end of the butt joint block is fixedly connected with the fixing column.
Through adopting above-mentioned technical scheme, protect a bottom portion at the steel and set up solid fixed ring, can tentatively spacing to the fixed column for the lower extreme butt of fixed column is in the up end of butt ring, after using external force to carry out the hammering to the fixed column, the butt piece can extrude butt ring, and pass the butt ring and peg graft with the hole bottom in stake hole, thereby can drive the inserted bar and peg graft on the inside wall in stake hole, and the lower extreme of fixed column can peg graft on the hole bottom in stake hole. In the process that the steel reinforcement cage descends, due to the arrangement of the abutting ring, the inserted bar is located in the movable hole, the movable hole is not prone to stretching out, and the steel reinforcement cage can be conveniently placed in the pile hole.
Preferably, the upper end face of the fixed cylinder is provided with a mounting hole which is in plug-in fit with the vertical steel bar; the lower hole wall of the mounting hole penetrates through the lower end face of the fixed cylinder; the vertical steel bar penetrates through the mounting hole and is inserted and connected to the bottom of the pile hole; the vertical steel bar is fixedly connected with the fixed cylinder.
Through adopting above-mentioned technical scheme, set up the mounting hole at the up end of a fixed section of thick bamboo for vertical reinforcing bar can pass a fixed section of thick bamboo, improves the area of contact of vertical reinforcing bar and a fixed section of thick bamboo, and weld the reinforcement again in the junction of a fixed section of thick bamboo and vertical reinforcing bar, can improve the reliability of a fixed section of thick bamboo and steel reinforcement cage bottom connection. The vertical reinforcing steel bar passes the bottom of a fixed cylinder, can peg graft in the bottom in stake hole, has further strengthened the reliable and stable nature to the steel reinforcement cage installation.
Preferably, a plurality of second annular reinforcing steel bars are arranged on the inner side wall of the vertical reinforcing steel bar at intervals in the height direction; and the second annular reinforcing steel bar is fixedly connected with the first annular reinforcing steel bar through a connecting bar.
Through adopting above-mentioned technical scheme, set up a plurality of second annular reinforcing bars, can strengthen the fixed effect to vertical reinforcing bar to strengthen the structural firmness of whole steel reinforcement cage.
In a second aspect, the present application provides a construction method of a pile foundation structure, which adopts the following technical scheme:
a construction method of a pile foundation structure comprises the following steps:
s1, construction preparation, site leveling and sundry removal;
s2, embedding a steel casing;
s3, preparing mud;
s4, drilling;
s5, hoisting a reinforcement cage;
s6, hanging down the guide pipe;
s7, filling concrete;
s8, pouring a concrete base;
and S9, curing the concrete.
By adopting the technical scheme, the mud with sediments in the pile hole can be precipitated and recycled in time in the mud preparation process, and the utilization rate of the mud is improved.
Preferably, the step of S5 includes:
s51, hoisting the reinforcement cage into the pile hole, enabling the fixing cylinder at the bottom of the reinforcement cage to be abutted against the bottom of the pile hole, and inserting the vertical reinforcement into the bottom of the pile hole;
s52, hanging a steel casing into a section, enabling the lower end face of the steel casing to be located above the horizontal plane of the movable hole, hammering a fixing column, enabling the lower end of the fixing column to penetrate through the abutting ring and be inserted at the bottom of the hole of the pile hole, and driving the fixing rod to move downwards to enable the fixing rod to push the insertion rod to extend out of the movable hole and be inserted on the hole wall of the pile hole.
By adopting the technical scheme, the steel reinforcement cage hoisting process is divided into two steps, so that the stability of steel reinforcement cage installation can be improved, and the quality of the poured pile body is enhanced.
Preferably, the step of S6 includes:
the guide pipe is inserted between the limiting part and the reinforcing rib, so that the guide pipe moves downwards along the limiting part and the reinforcing rib until the lower end of the guide pipe is abutted against the upper end face of the fixing rod, and the outer side wall of the guide pipe is abutted against one side of the limiting rod, which is close to the fixing column.
Through adopting above-mentioned technical scheme, the back is installed to the steel reinforcement cage, can recycle the dead lever, and the dead lever can the ready-to-assemble stand pipe to convenient concreting.
In summary, the present application includes at least one of the following beneficial technical effects:
the reinforcement cage is positioned, so that the reinforcement cage is more stable and reliable to install and is not easy to deviate, and the quality of a pile body formed after concrete is poured subsequently can be improved;
after the fixing column is inserted into the hole bottom of the pile hole, the lower end of the fixing rod keeps a certain distance from the hole bottom of the pile hole, and after the reinforcement cage is installed, the guide pipe is installed, so that the guide pipe can guide concrete pouring conveniently;
set up the locating part in the upper end of fixed column, can further improve the direction spacing to the stand pipe for the lower extreme of stand pipe can overlap joint in the upper end of dead lever accurately.
Drawings
Fig. 1 is a schematic structural diagram of the whole of the embodiment of the present application.
Fig. 2 is a schematic view of the structure of the embodiment of the present application in which the insert rod is extended.
Fig. 3 is a schematic structural diagram of a positioning device according to an embodiment of the present application.
Fig. 4 is an enlarged schematic view of a portion a in fig. 3.
Description of reference numerals: 1. a steel casing; 2. a reinforcement cage; 21. vertical reinforcing steel bars; 22. a first annular reinforcing bar; 23. a second annular reinforcing bar; 24. connecting ribs; 25. reinforcing ribs; 3. a fixed cylinder; 31. mounting holes; 32. a fixing ring; 33. a cross bar; 34. a butting ring; 35. a movable hole; 4. a positioning device; 41. fixing a column; 42. a butting block; 43. fixing the rod; 44. positioning the ring sheet; 441. a chute; 45. inserting a rod; 451. a slider; 46. a connecting rod; 47. a limiting rod; 5. a guide tube; 6. a limiting member; 61. a first limit ring; 62. a second stop collar; 63. a bar-shaped rod; 7. pile hole.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses pile foundation structure.
Referring to fig. 1, the pile foundation structure includes a steel casing 1 embedded in a pile hole 7 and a reinforcement cage 2 fixed in the steel casing 1. A cast-in-place pile body is poured in the steel casing 1, and the reinforcement cage 2 is positioned in the pile body.
Referring to fig. 1, the reinforcement cage 2 is formed by a plurality of vertical reinforcements 21 arranged in a circular ring shape. A plurality of first annular reinforcing bars 22 are fixed on the outer side of the vertical reinforcing bar 21 from top to bottom at intervals, a plurality of second annular reinforcing bars 23 are fixed on the inner side wall of the vertical reinforcing bar 21 along the height direction at intervals, and the second annular reinforcing bars 23 are fixedly connected with the first annular reinforcing bars 22 through connecting bars 24. The reinforcing ribs 25 are fixedly mounted on the vertical reinforcing steel bars 21 and close to the upper end, the reinforcing ribs 25 are three, the end portions of every two reinforcing ribs 25 are fixedly connected to form a triangular supporting frame, and the end portions of the supporting frame are fixedly connected with the vertical reinforcing steel bars 21.
Referring to fig. 1 and 2, the bottom of the reinforcement cage 2 is fixedly provided with a fixing cylinder 3, and the fixing cylinder 3 is stable in shape and can stably support the reinforcement cage 2. The upper end surface of the fixed cylinder 3 is provided with a plurality of mounting holes 31, and the lower hole walls of the mounting holes 31 penetrate through the lower end surface of the fixed cylinder 3. The vertical steel bars 21 are inserted and matched with the mounting holes 31. The vertical steel bar 21 passes through the mounting hole 31 and is inserted and connected to the bottom of the pile hole 7, and the joint of the vertical steel bar 21 and the fixed cylinder 3 is welded and fixed.
Referring to fig. 3, a fixing ring 32 coaxially disposed with the reinforcement cage 2 is fixed on the bottom of the fixing cylinder 3, and an outer side wall of the fixing ring 32 is fixedly connected with an inner side wall of the fixing cylinder 3 through a cross bar 33. The inner side wall of the fixing ring 32 is fixed with an abutting ring 34, and the hardness of the fixing ring 32 is greater than that of the abutting ring 34. After the reinforcement cage 2 is integrally placed in the pile hole 7, the cross rod 33 and the fixing ring 32 are tightly abutted against the bottom of the pile hole.
Referring to fig. 3, in order to reinforce the connection of the reinforcement cage 2 to the pile hole 7, a positioning device 4 is installed in the reinforcement cage 2. The lateral wall of the fixed cylinder 3 is provided with a plurality of movable holes 35, and the plurality of movable holes 35 are uniformly arranged along the circumferential direction of the fixed cylinder 3. The positioning device 4 includes a fixing post 41, a fixing lever 43, a connecting rod 46, and an insertion rod 45. The fixing column 41 is installed in the reinforcement cage 2, the upper end of the fixing column 41 is close to the upper end of the reinforcement cage 2, the lower end of the fixing column 41 is fixed with the abutting block 42, the abutting block 42 is in a circular truncated cone shape, and the large end of the abutting block 42 is fixedly connected with the lower end of the fixing column 41. The lower end of the abutment block 42 abuts on the upper end surface of the abutment ring 34. The axis of the fixing column 41 is coincident with the axis of the reinforcement cage 2. Dead lever 43 welded fastening is in the circumference of fixed column 41, and the lower extreme of dead lever 43 and the direct fixedly connected with bracing piece of the lateral wall of fixed column 41 improve the stability to dead lever 43 supports. The cross-section of dead lever 43 is isosceles trapezoid, and the upper base of dead lever 43 is towards the top for concrete can not cause when later stage concreting to pile up on dead lever 43. The fixing rods 43 are provided in plurality at intervals along the circumferential direction of the fixing posts 41, and the fixing rods 43 are provided in one-to-one correspondence with the movable holes 35. The fixing rod 43 is horizontally arranged, and a positioning ring piece 44 is fixed on the inner side wall of the fixing barrel 3.
Referring to fig. 3 and 4, a plurality of sliding grooves 441 are formed in the upper end surface of the positioning ring 44, one end of an extension line of each sliding groove 441 passes through the movable hole 35, and the other end of the extension line of each sliding groove 441 passes through the axis of the fixing column 41. The insertion rod 45 is slidably disposed on the positioning ring 44, and a slider 451 slidably engaged with the sliding groove 441 is fixed to a lower end surface of the insertion rod 45. The slider 451 is dovetail-shaped in cross section. One end of the inserting rod 45 is inserted into the movable hole 35, and one end of the inserting rod 45 close to the fixed rod 43 is hinged with one end of the connecting rod 46. The end of the connecting rod 46 far away from the inserting rod 45 is hinged with the lower end face of the fixing rod 43.
Referring to fig. 3, a limiting rod 47 is fixed on the upper end surface of the fixing rod 43, the limiting rod 47 is vertically arranged, and an arc surface is formed on one side of the limiting rod 47, which is close to the fixing column 41. The circumferential sleeve of fixed column 41 is equipped with guide tube 5, and guide tube 5 is used for leading-in the concrete in stake hole 7. The stand pipe 5 sets up with fixed column 41 is coaxial, the lower terminal surface and the dead lever 43 butt of stand pipe 5, the lateral wall of stand pipe 5 and the position that is close to the stand pipe 5 bottom laminate mutually with the cambered surface of gag lever post 47.
Referring to fig. 1, in order to improve the movement restriction of the guide pipe 5 so that the guide pipe 5 can stably move in the height direction of the fixed column 41, a stopper 6 is fixedly mounted on the upper end of the fixed column 41. The limiting member 6 includes a first limiting ring 61, a second limiting ring 62 and a bar-shaped rod 63. The first limiting ring 61 is fixedly connected with the circumferential direction of the fixing column 41 and a position close to the upper end of the fixing column 41. The second position-limiting ring 62 is spaced apart from the first position-limiting ring 61. The two ends of the bar-shaped rod 63 are respectively fixedly connected with the first limiting ring 61 and the second limiting ring 62. The plurality of bar-shaped rods 63 are arranged uniformly along the axis of the first stopper ring 61. The second limit ring 62 is attached to the inner side wall of the guide tube 5. The strengthening rib 25 staggers the setting each other with locating part 6 along the direction of height of stand pipe 5, and the lateral wall of stand pipe 5 offsets with the inside wall of strengthening rib 25, can further make the stand pipe 5 installation more reliable and stable.
The embodiment of the application also discloses a construction method of the pile foundation structure.
Referring to fig. 1 and 3, a construction method of a pile foundation structure includes the following steps:
s1, construction preparation, field leveling, sundries removal and field tamping.
S2, burying the steel casing 1, wherein the steel casing 1 is formed by rolling a steel plate with the wall thickness of 10mm, the length of each steel casing 1 is 10m, and the steel casing 1 is buried by using a vibration rammer.
And S3, preparing mud, namely, before drilling, arranging a sedimentation tank and a mud tank near the pile position, and arranging a notch communicated with the mud tank at one side of the sedimentation tank and at a position close to the upper surface of the sedimentation tank. The mud with the drilling slag flowing out of the drill hole flows into a sedimentation tank through a mud tank, is sedimentated by the sedimentation tank and then flows into a mud tank for being sucked by a mud pump and supplied into the steel casing 1.
And S4, drilling, wherein drilling construction operation is carried out by adopting two modes of a percussion drill and a rotary excavator. And in the drilling process, slurry is supplemented into the pile hole 7, so that the slurry surface in the drilling process is higher than the bottom of the steel casing 1, and the possibility of collapse of the hole wall is reduced. And cleaning the hole by adopting a slurry changing method after drilling, sucking the slurry treated by the sedimentation tank into the pile hole 7 through a slurry pump, and changing the slurry containing the sludge in the pile hole 7.
S5, hoisting the reinforcement cage 2, and hoisting the reinforcement cage 2, so that the reinforcement cage 2 is stably and reliably installed.
S51, placing the processed reinforcement cage 2 in the pile hole 7 through a truck crane, enabling the fixing cylinder 3 at the bottom of the reinforcement cage 2 to be abutted against the bottom of the pile hole 7, inserting the vertical reinforcement 21 at the bottom of the pile hole 7, and primarily fixing the reinforcement cage 2 integrally.
S52, the steel casing 1 is hung to be a section, the lower end face of the steel casing 1 is located above the horizontal plane where the movable hole 35 is located, the fixing column 41 is hammered through the hammer, the fixing column 41 moves towards the direction close to the bottom of the pile hole 7, the strip-shaped rod 63 is driven to move downwards, the end portion of the inserting rod 45 penetrates through the movable hole 35 and is inserted into the hole wall of the pile hole 7, the steel reinforcement cage 2 can be further positioned, and the steel reinforcement cage 2 is more stable to mount. The lower end of the fixing column 41 is inserted into the bottom of the pile hole 7, so that the fixation of the reinforcement cage 2 can be further improved. The height of the fixing rod 43 is 0.3-0.5m away from the bottom of the pile hole 7.
S6, hanging down the guide tube 5, inserting the guide tube 5 between the limiting piece 6 and the reinforcing rib 25, so that the guide tube 5 moves down along the limiting piece 6 and the reinforcing rib 25 until the lower end of the guide tube 5 is abutted against the upper end face of the fixing rod 43, and the outer side wall of the guide tube 5 is abutted against one side of the limiting rod 47 close to the fixing column 41.
S7, concrete filling, wherein before concrete filling, hole bottom sediment detection is carried out, the thickness of the sediment is not more than a design specified value of 30mm, if the thickness of the sediment exceeds a design value, hole cleaning is carried out through an air suction dredge, so that the thickness of the sediment reaches the design requirement, then the next procedure is carried out, concrete is poured, and the concrete is filled in the pile hole 7 along the guide pipe 5. The concrete is poured in sections, and the steel casing 1 and the guide pipe 5 are lifted out while the concrete is poured in sections, so that the height of the guide pipe 5 immersed in the concrete is not more than 1 m.
S8, pouring the concrete base, prefabricating the concrete base, wherein the concrete base is cuboid, a connecting hole is formed in the upper end face of the concrete base, the diameter of the connecting hole is larger than that of the pile body, after the pile body is poured, the concrete base is covered on the end portion of the pile body, the end portion of the pile body is located in the connecting hole, concrete is poured in the connecting hole, and the pile body and the concrete base are connected.
And S9, curing the concrete, and curing the pile foundation in a segmented time mode according to the type and the components of the concrete.
The implementation principle of the pile foundation structure in the embodiment of the application is as follows: firstly, construction preparation is carried out, and a field is leveled and tamped. After the steel casing 1 is embedded, a sedimentation tank and a mud pit are arranged near the pile position. And drilling construction operation is carried out by adopting a percussion drill and a rotary drilling machine. And then the reinforcement cage 2 is hoisted in the pile hole 7, so that the lower end of the vertical reinforcement 21 is inserted into the hole bottom of the pile hole 7, the lower end surface of the fixed cylinder 3 is tightly abutted against the hole bottom of the pile hole 7, and the cross rod 33 and the fixed ring 32 are tightly abutted against the hole bottom of the pile hole 7. When the fixing column 41 is hammered, the abutting block 42 at the lower end of the fixing column 41 passes through the abutting ring 34 and is inserted into the hole bottom of the pile hole 7. The fixing rod 43 drives the inserting rod 45 to extend out of the movable hole 35 and be inserted and connected to the hole wall of the pile hole 7. Install stand pipe 5 on dead lever 43 again for the inside wall of stand pipe 5 and the laminating of the lateral wall of second spacing ring 62, the laminating of the lateral wall of stand pipe 5 and the inside wall of strengthening rib 25, rethread storage hopper cooperation stand pipe 5 pours into concrete. After the pile body is poured, the concrete base is covered on the end part of the pile body, so that the end part of the pile body is positioned in the connecting hole, concrete is poured in the connecting hole, and the pile body and the concrete base are connected. And finally, performing segmented time maintenance on the pile foundation according to the type and the components of the concrete.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the application are covered in the protection scope of the application.
Claims (10)
1. A pile foundation structure comprises a steel pile casing (1) arranged in a pile hole (7), wherein a cast-in-place pile body is poured in the steel pile casing (1), and a reinforcement cage (2) is arranged in the pile body, and is characterized in that a fixed cylinder (3) is arranged at the bottom of the reinforcement cage (2); a plurality of movable holes (35) are formed in the side wall of the fixed cylinder (3); a positioning device (4) is arranged in the fixed cylinder (3); the positioning device (4) comprises a fixed column (41) arranged in the reinforcement cage (2) and a fixed rod (43) which is arranged on the fixed column (41) and is horizontally arranged; the fixing column (41) and the reinforcement cage (2) are coaxially arranged; the fixed rods (43) are arranged along the circumferential direction of the fixed column (41) at intervals; a positioning ring piece (44) is arranged on the inner side wall of the fixed cylinder (3); a plurality of sliding grooves (441) are formed in the upper end face of the positioning ring piece (44); one end of the extension line of the sliding groove (441) penetrates through the movable hole (35), and the other end of the extension line of the sliding groove (441) penetrates through the axis of the fixed column (41); the positioning ring piece (44) is provided with an inserted bar (45) in a sliding way; a plurality of inserting rods (45) are arranged along the circumferential direction of the positioning ring piece (44), and the inserting rods (45) are arranged in one-to-one correspondence with the fixing rods (43); the lower end surface of the inserted rod (45) is provided with a sliding block (451), and the sliding block (451) is arranged in the sliding groove (441) in a sliding manner; one end of the inserted rod (45) is inserted into the movable hole (35); one end of the inserted bar (45) close to the fixed bar (43) is hinged with a connecting bar (46), and one end of the connecting bar (46) far away from the inserted bar (45) is hinged with the lower end face of the fixed bar (43).
2. Pile foundation structure according to claim 1, wherein the upper end surface of the fixing rod (43) is provided with a vertical stopper rod (47); a guide pipe (5) is sleeved on the circumferential direction of the fixing column (41); the guide pipe (5) and the fixing column (41) are coaxially arranged; the lower end surface of the guide tube (5) is abutted against the fixed rod (43).
3. Pile foundation structure according to claim 2, wherein the upper ends of the fixing columns (41) are provided with a stop (6); the limiting piece (6) comprises a first limiting ring (61) fixed on the fixing column (41) and a second limiting ring (62) arranged at an interval with the first limiting ring (61); a bar-shaped rod (63) is connected between the first limiting ring (61) and the second limiting ring (62); a plurality of connecting rods (46) are arranged at intervals along the circumferential direction of the first limiting ring (61); and the second limiting ring (62) is attached to the inner side wall of the guide pipe (5).
4. A pile foundation structure according to claim 2, wherein the reinforcement cage (2) is formed by a plurality of vertical reinforcement bars (21) arranged uniformly in a circular ring shape; a plurality of first annular reinforcing steel bars (22) are arranged on the outer side of the vertical reinforcing steel bars (21) at intervals from top to bottom; reinforcing ribs (25) are arranged on the vertical reinforcing steel bars (21); the number of the reinforcing ribs (25) is three, and the end parts of every two reinforcing ribs (25) are fixedly connected to form a triangular supporting frame; the end part of the support frame is fixedly connected with a vertical steel bar (21); the outer side wall of the guide pipe (5) is abutted to the inner side wall of the reinforcing rib (25).
5. Pile foundation structure according to claim 1, wherein the bottom of the fixed cylinder (3) is provided with a fixed ring (32); the fixing ring (32) and the reinforcement cage (2) are coaxially arranged; the outer side wall of the fixing ring (32) is fixedly connected with the inner side wall of the fixing barrel (3) through a cross rod (33); the inner side wall of the fixing ring (32) is provided with a butting ring (34); the lower end of the fixed column (41) is provided with a butting block (42); the abutting block (42) is in a circular truncated cone shape, and the large end of the abutting block (42) is fixedly connected with the fixing column (41).
6. The pile foundation structure according to claim 4, wherein the upper end surface of the fixed cylinder (3) is provided with a mounting hole (31) which is in plug fit with the vertical steel bar (21); the lower hole wall of the mounting hole (31) penetrates through the lower end face of the fixed cylinder (3); the vertical steel bars (21) penetrate through the mounting holes (31) and are inserted at the bottom of the pile hole (7); the vertical steel bars (21) are fixedly connected with the fixed cylinder (3).
7. A pile foundation structure according to claim 4, wherein a plurality of second annular reinforcing bars (23) are provided on the inner side walls of the vertical reinforcing bars (21) at intervals in the height direction; the second annular reinforcing steel bar (23) is fixedly connected with the first annular reinforcing steel bar (22) through a connecting rib (24).
8. A method of constructing a pile foundation structure according to any one of claims 1 to 7, including the steps of:
s1, construction preparation, site leveling and sundry removal;
s2, embedding the steel casing (1);
s3, preparing mud;
s4, drilling;
s5, hoisting the reinforcement cage (2);
s6, hanging down the guide pipe (5);
s7, filling concrete;
s8, pouring a concrete base;
and S9, curing the concrete.
9. The method for constructing a pile foundation structure according to claim 8, wherein the step of S5 includes:
s51, hoisting the reinforcement cage (2) into the pile hole (7), enabling the fixed cylinder (3) at the bottom of the reinforcement cage (2) to be abutted against the bottom of the pile hole (7), and inserting the vertical reinforcement (21) into the bottom of the pile hole (7);
s52, hanging the steel casing (1) into a section, enabling the lower end face of the steel casing (1) to be located above the horizontal plane where the movable hole (35) is located, hammering the fixing column (41), enabling the lower end of the fixing column (41) to penetrate through the abutting ring (34) and be inserted into the hole bottom of the pile hole (7), enabling the fixing column (41) to drive the fixing rod (43) to move downwards, and enabling the fixing rod (43) to push the insertion rod (45) to extend out of the movable hole (35) and be inserted into the hole wall of the pile hole (7).
10. The method for constructing a pile foundation structure according to claim 8, wherein the step of S6 includes:
the guide tube (5) is inserted between the limiting part (6) and the reinforcing rib (25), so that the guide tube (5) moves downwards along the limiting part (6) and the reinforcing rib (25) until the lower end of the guide tube (5) is abutted against the upper end face of the fixing rod (43), and the outer side wall of the guide tube (5) is abutted against one side, close to the fixing column (41), of the limiting rod (47).
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| CN113062310A (en) * | 2021-04-07 | 2021-07-02 | 中铁广州工程局集团有限公司 | Super-large and multilayer karst cave crossing construction process for highway bridge pile foundation |
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| CN112663598B (en) * | 2021-01-12 | 2022-05-13 | 中铁七局集团广州工程有限公司 | Install firm steel reinforcement cage |
| CN113152451A (en) * | 2021-01-26 | 2021-07-23 | 重庆大学 | Hole collapse and hole expansion preventing fixed cylinder for pile foundation pit |
| CN112854186B (en) * | 2021-03-24 | 2022-02-11 | 广东新江永安建设工程有限公司 | Soft soil foundation municipal road treatment method |
| CN112854186A (en) * | 2021-03-24 | 2021-05-28 | 广东新江永安建设工程有限公司 | Soft soil foundation municipal road treatment method |
| CN113062310A (en) * | 2021-04-07 | 2021-07-02 | 中铁广州工程局集团有限公司 | Super-large and multilayer karst cave crossing construction process for highway bridge pile foundation |
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| CN113373911A (en) * | 2021-05-31 | 2021-09-10 | 山东水总有限公司 | Anchor-thorn cast-in-place pile and construction method thereof |
| CN113846991A (en) * | 2021-09-22 | 2021-12-28 | 浙江化工工程地质勘察院有限公司 | Borehole inner wall reinforcing structure and method |
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| CN113981982A (en) * | 2021-11-05 | 2022-01-28 | 华能洋浦热电有限公司 | Transfer device of pile foundation steel reinforcement cage |
| CN114086549A (en) * | 2021-11-10 | 2022-02-25 | 中国建筑第四工程局有限公司 | Pile foundation punching and drilling reinforcing device based on relatively broken rock mass |
| CN114197473B (en) * | 2021-12-16 | 2023-01-17 | 广州市第三市政工程有限公司 | Limiting protection device for overwater platform reducing pile and construction method thereof |
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| CN114855800B (en) * | 2022-06-16 | 2023-12-12 | 河南中原金太阳技术有限公司 | Automatic cleaning device for hole bottoms after pile foundation construction |
| CN114941321A (en) * | 2022-06-22 | 2022-08-26 | 中煤长江基础建设有限公司 | Cast-in-place pile reinforcement cage construction device and construction method |
| CN115288129A (en) * | 2022-08-15 | 2022-11-04 | 南京南部路桥建设(集团)有限公司 | Combined tool for placing reinforcement cage and concrete pouring guide pipe |
| CN115288129B (en) * | 2022-08-15 | 2024-04-02 | 南京南部路桥建设(集团)有限公司 | Combined tool for lowering reinforcement cage and concrete pouring guide pipe |
| CN115784014A (en) * | 2023-01-06 | 2023-03-14 | 山西冶金岩土工程勘察有限公司 | Steel reinforcement cage hoist device of quick installation |
| CN116607553A (en) * | 2023-06-27 | 2023-08-18 | 中国科学院西北生态环境资源研究院 | Rod type pile foundation capable of preventing pile body from being pulled out and working method |
| CN116607553B (en) * | 2023-06-27 | 2023-09-26 | 中国科学院西北生态环境资源研究院 | Rod type pile foundation capable of preventing pile body from being pulled out and working method |
| US12065797B1 (en) | 2023-06-27 | 2024-08-20 | Northwest Institute Of Eco-Environment And Resources, Cas | Rod-type pile foundation for preventing pile body from being heaved and operating method thereof |
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