CN111576406B - Construction process of bored pile in complex soil layer and steel casing for construction - Google Patents
Construction process of bored pile in complex soil layer and steel casing for construction Download PDFInfo
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- CN111576406B CN111576406B CN202010526725.XA CN202010526725A CN111576406B CN 111576406 B CN111576406 B CN 111576406B CN 202010526725 A CN202010526725 A CN 202010526725A CN 111576406 B CN111576406 B CN 111576406B
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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
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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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 a construction process of a hole digging pile in a complex soil layer and a steel protective cylinder for construction, wherein the steel protective cylinder for construction comprises a plurality of arc-shaped plates, the arc-shaped plates are enclosed to form the steel protective cylinder, a shaping device for locking and supporting the two arc-shaped plates is arranged at the joint part of two adjacent arc-shaped plates, the shaping device comprises buckling blocks fixedly connected to the axial side of the inner arc surface of each arc-shaped plate, the two adjacent buckling blocks on the two adjacent arc-shaped plates are jointly sleeved with shaping plates which are adaptive to the radian of the arc-shaped plates and in a crescent shape, the two ends of each shaping plate are inserted into gaps between the vertical sections of the buckling blocks and the inner walls of the arc-shaped plates, and when the shaping plates are abutted against the horizontal sections of the buckling blocks, the peripheral sides of the. According to the invention, the steel casing is split into the plurality of arc-shaped plates, so that the steel casing can be quickly hoisted from the hole during installation and dismantling, and compared with hoisting of an integrated steel casing, the steel casing hoisting device is faster and safer, the construction efficiency is improved, and the construction cost is reduced.
Description
Technical Field
The invention relates to the technical field of pile foundation engineering construction technology, in particular to a construction process of a bored pile in a complex soil layer and a steel casing for construction.
Background
The complicated foundation soil is mainly formed by a geological environment change caused or induced by human activities, such as accumulation and transportation of various industrial wastes (blast furnace slag, steel slag, tailings, fly ash, waste rocks, and the like), and a soft soil layer mainly comprising a miscellaneous fill layer, a plain fill layer, a silt layer, a silty clay layer, a sandstone layer, and the like is formed. In the pile foundation operation in these soft soil layers, consideration needs to be given to soft soil layers of different geologies, and in the hole digging pile operation, a series of construction problems such as hole wall collapse, hole wall subsidence, ground subsidence, underground obstacles, and retaining wall collapse need to be considered.
The hole digging pile pier has high bearing capacity, reliable technology and simple and convenient construction, is widely applied to water-free or little water and compact soil or rock stratum, and has obvious economic benefit and environmental benefit because the hole digging pile technology can be constructed in an open field, can be constructed adjacent to the original building in a building dense area and can remove or treat underground obstacles in construction.
The prior Chinese patent with the patent publication number of CN104499479B provides a construction method of a dug pile penetrating through a gravel backfill layer, which comprises the following steps: surveying the depth of the underground water level and the depth of a bedrock layer on the spot, and marking the design construction position of the hole digging pile; vertically driving a circle of grouting pipes around the periphery of the hole digging pile; simultaneously injecting cement slurry doped with an anti-permeability agent into each grouting pipe through a high-pressure grouting device, enabling the cement slurry to permeate into a gravel backfill layer through grouting holes in the pipe wall of each grouting pipe, and pulling out each grouting pipe after grouting; after grouting, water sealing and reinforcing are completed, cement paste and the sand gravel backfill layer form a circle of concrete; and then, excavating holes at the designed construction positions of the hole digging piles, supporting the walls, and finally pouring concrete into the holes to form the hole digging piles. The invention has the advantages of solving the technical problem that the dug pile is difficult to pass through the sand gravel backfill layer with strong water permeability and poor self-stability, along with safe and reliable construction and high pile body bearing capacity.
The above prior art solutions have the following drawbacks: when a hole of a bored pile is excavated to a position just before the bored pile penetrates through a gravel layer or a sludge layer which is easy to collapse, a steel casing is required to slide into the hole from the inner edge of a brick casing or a reinforced concrete casing above the steel casing so as to protect the excavation of the soft soil layer with large water content, the collapse of the casing can be effectively prevented, usually, the construction space in the hole is enlarged as much as possible, and the outer diameter of the steel casing is slightly smaller than the inner diameter of the brick casing or the reinforced concrete casing, so that when the steel casing is installed, lubricating oil is generally smeared on the outer wall of the steel casing so as to facilitate the smooth sliding of the steel casing, but the steel casing is required to be always coaxial with the brick casing or the reinforced concrete casing, so that the time consumption is long when the steel casing is installed and the steel casing is dismantled, and the construction efficiency is low.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the steel casing for the construction of the bored pile in the complex soil layer, which has the advantages of convenient and fast dismantling of the steel casing and high construction efficiency.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides a complicated soil layer bored pile construction is with steel protects a section of thick bamboo, includes a plurality of arcs, and is a plurality of the arc encloses to close and forms a steel and protects a section of thick bamboo, adjacent two can dismantle the connection between the arc, adjacent two the arc joint portion is provided with and is used for the locking to support two the setting device of arc, setting device includes the rigid coupling is in the piece is detained to cambered surface axial avris in the arc, adjacent two on the arc detain on the piece common cover be equipped with the shaping board of arc radian adaptation and be crescent on detaining the piece, the both ends of shaping board peg graft in detain a vertical section with in the space between the arc inner wall, work as the shaping board with when detaining a horizontal segment butt, shaping board week side with the laminating of cambered surface in the arc.
By adopting the technical scheme, the steel protecting cylinder is split into the plurality of arc-shaped plates, so that the steel protecting cylinder can be quickly hoisted from the hole when being installed and dismantled, and compared with the hoisting of the integrated steel protecting cylinder, lubricating oil does not need to be smeared on the outer wall of the steel protecting cylinder, and the steel protecting cylinder does not need to be ensured to be coaxially and slowly lowered or lifted with the hole all the time, so that the construction efficiency is improved, and the construction cost is reduced; when the installation steel protects a section of thick bamboo, make a plurality of arcs end to end lock enclose synthetic tube-shape earlier, insert the stereotype again on two adjacent buckles, make the cambered surface limit and the intrados butt in the cambered surface limit of stereotype, for a plurality of arcs provide the support, can improve the whole compressive capacity of a plurality of arcs, ensured constructor's life safety.
In a preferred example of the present invention, the upper end surface and the lower end surface of the shaping plate are fixedly connected with a plurality of rib plates attached to one side of the cambered surface of the shaping plate, and the rib plates are perpendicular to the shaping plate.
Through adopting above-mentioned technical scheme, behind the sizing plate cambered surface side and the interior cambered surface laminating of arc, the floor also supports with the interior cambered surface of arc, has increased the shaping plate and to the support effect of arc, has improved the anti ability of buckling of axial of arc.
In a preferred example of the present invention, the fastening block includes a base fixed to the inner arc surface of the arc plate in a horizontal welding manner, one end of the base away from the arc plate is fixedly connected with a locking column, one side of the locking column close to the arc plate is provided with an inclined surface, and a distance from one end of the locking column close to the base to the arc plate is smaller than a distance from one end of the locking column away from the base to the arc plate.
By adopting the technical scheme, the plurality of arc plates are difficult to form a complete cylinder shape during pre-splicing, and when the end part of the shaping plate is inserted into a gap between the locking column and the arc plates, the arc side of the shaping plate is difficult to be completely abutted against the inner arc surface of the arc plate, but can be abutted against the upper end of the inclined surface of the locking column, so that the locking column can still limit the shaping plate, and the shaping plate is convenient to mount conveniently; when promoting the stereotype towards the direction oppression that is close to the base, the inclined plane that the locking post set up is convenient for the stereotype to support tightly gradually of cambered plate intrados, and is more swift when assembling into a steel with a plurality of arcs and protects a section of thick bamboo.
In a preferred example of the present invention, two ends of the sizing plate in the length direction are provided with caulking grooves adapted to be inserted into one end of the locking column close to the base, and the caulking grooves are located on the side of the sizing plate.
Through adopting above-mentioned technical scheme, the location of stereotype when installing the stereotype is more accurate, prevents that the stereotype from taking place the displacement behind the arc pressurized.
The invention may further be configured in a preferred example, a locking mechanism for locking the sizing plate on the base is arranged on the base.
Through adopting above-mentioned technical scheme, locking mechanism is convenient for the tip of stereotype to block totally in the locking post and with the laminating of base to firmly stereotype two blocks of adjacent arcs.
The invention may further be configured in a preferred example, the locking mechanism includes a locking bolt screwed on the base, a head end of the locking bolt is sleeved with a supporting block for supporting the shaping plate, and the caulking groove is inserted and adapted with the supporting block and the locking column at the same time.
Through adopting the above-mentioned technical scheme, during the installation stereotype, stir earlier the piece that supports to being close to the locking post, embolia the stereotype between locking post and the arc this moment, support the caulking groove on piece and the locking post pass the stereotype, it makes the one side of keeping away from the caulking groove towards the piece that supports to rotate the piece that supports on the locking bolt after the piece is crossed to the stereotype, rotatory locking piece bolt this moment, the locking bolt promotes the stereotype through supporting the piece and removes towards the direction that is close to the base, the stereotype is kept away from the arc and is slided down on the inclined plane on the locking post, terminal surface and base butt under the final stereotype that makes, the locking post carries out the locking to the stereotype this moment, make the cambered surface of stereotype can effectively with the interior cambered surface butt of arc, thereby support the arc of adjacent two concatenations, the overall structure intensity of the synthetic steel of a plurality of arc hoardings has effectively been promoted.
In a preferred example of the present invention, the lock bolt may further include an elastic member and a gasket, and the abutting block is located above the gasket.
Through adopting above-mentioned technical scheme, when rotatory locking bolt drive stereotype board was removed towards the direction that is close to the base, stereotype board promoted the gasket and oppresses the elastic component compression, when the stereotype board was demolishd to needs, the locking bolt of loosening soon, the deformation power drive gasket of elastic component promoted the stereotype board and shifts up for it is more convenient when dismantling the stereotype board, thereby it is more convenient when dismantling and take out the steel casing from the stake is downthehole, has improved the efficiency of construction.
In a preferred example, the thickness of the side of the sizing plate close to the arc plate is larger than the thickness of the side of the sizing plate far from the arc plate.
Through adopting above-mentioned technical scheme, the area of contact increase of stereotype plate and arc, and less to the weight that the stereotype plate increases, further improved the supporting effect of stereotype plate to the arc for a plurality of arcs enclose synthetic steel and protect a structural strength higher.
The invention aims to provide a construction process of a bored pile in a complex soil layer, which also has the advantages of convenient and fast removal of a steel casing and high construction efficiency.
The above object of the present invention is achieved by the following technical solutions:
the construction process of the bored pile in the complex soil layer is based on the steel pile casing for the construction of the bored pile in the complex soil layer, and comprises the following steps of:
s1, surveying on site, measuring the depth of an underground water level and the depth of a bedrock layer, and marking the designed construction position of a bored pile;
s2, arranging a dewatering well, burying a water filtering well pipe around the pile position, and pumping underground water by a submersible pump;
s3, excavating a filling layer, namely excavating the filling layer, and sequentially piling brick retaining walls or sinking precast reinforced concrete retaining walls or spraying concrete retaining walls in the excavating process;
s4, excavating a complex soft soil layer, combining geological data according to data of field survey, and inserting an open caisson retaining wall into a retaining wall of a filling soil layer when a fluidized and plastic fly ash layer is arranged below the filling soil layer to excavate and protect the fly ash layer;
when the lower part of the filling layer is a plastic clay layer, the brick retaining wall is continuously piled at the edge of the hole of the clay layer;
when an obstacle difficult to dig exists below the filling layer, static blasting is adopted for breaking or a pneumatic pick is adopted for chiseling;
s5, excavating a sludge layer, namely penetrating a plurality of arc-shaped plates through the retaining walls in the steps S2 and S3 and transmitting the arc-shaped plates to the bottom of the hole, inserting the arc-shaped plates into the periphery of the hole and assembling the arc-shaped plates into a cylindrical steel retaining cylinder, and then shaping the arc-shaped plates through buckling connection of the shaping plates and the buckling blocks so as to improve the integral pressure resistance of the arc-shaped plates, wherein the steel retaining cylinder sinks while excavating after the steel retaining cylinder is assembled;
s6, installing a reinforcement cage, after the hole is excavated to the foundation layer, installing the reinforcement cage in the excavated hole, and correcting the verticality of the reinforcement cage;
s7, pile foundation pouring concrete and steel casing dismantling, pouring concrete into the hole, dismantling the plurality of setting plates simultaneously, gradually drawing out the plurality of arc-shaped plates along with continuous pouring of the concrete surface, keeping the concrete surface 1.5-2 m higher than the lower end surface of the arc-shaped plates all the time until the concrete surface is contacted with the casing wall above the steel casing, and completely taking out the plurality of arc-shaped plates.
By adopting the technical scheme, when the hole of the bored pile is excavated in a complex soil layer, the corresponding retaining wall supporting structure is determined according to different flow plastic states of the soil layer, when the silt layer is excavated, the excavation of the silt layer is supported by the steel retaining cylinder formed by splicing the plurality of arc plates, when the steel retaining cylinder is installed, the plurality of sections of arc plates are only required to be hung in the hole, the construction is convenient and efficient, then the plurality of arc plates are shaped into the complete steel retaining cylinder by the clamping connection of the shaping plates and the buckling blocks, the integral axial bending resistance of the steel retaining cylinder is improved, when the steel retaining cylinder is dismantled after the hole is completed, the clamping connection of the shaping plates and the buckling blocks is only required to be firstly removed, then the plurality of arc plates are hung out, the dismantling efficiency is higher, the whole construction period of hole excavation is shortened, the construction efficiency is high, and the cost is low.
The present invention may further be configured in a preferred example that, in step S2, when pumping groundwater from the drainage well pipe, a recharge trench or a recharge well is excavated along one side of the foundation of the pile pier of the hole in the building or the structure, so as to prevent the ground from sinking due to too fast drop of the groundwater level near the pile position.
By adopting the technical scheme, when the underground water at the peripheral side of the hole pile pier is pumped out by the water filtering well pipe, the underground water level at the position is sharply reduced, the ground is easily caused to be unevenly settled, so that the adjacent buildings and structures are unevenly stressed to cause potential safety hazards, the pumped underground water is drained back into the recharge ditch or the recharge well, the underground water is enabled to permeate into the soil layer from one side of the buildings and the structures close to the hole pile pier again, the natural underground water level is kept in the soil layer as far as possible, and the settlement of the adjacent buildings and the structures is reduced to the minimum degree.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the steel casing is split into the plurality of arc-shaped plates, so that the steel casing can be quickly hoisted from the hole when being installed and dismantled, and compared with the hoisting of the integrated steel casing, lubricating oil does not need to be smeared on the outer wall of the steel casing, and the steel casing and the hole do not need to be coaxially and slowly lowered or lifted all the time, so that the construction efficiency is improved, and the construction cost is reduced;
2. when the end part of the shaping plate is inserted into a gap between the locking column and the arc plate and the shaping plate is pushed to press towards the direction close to the base, the inclined plane arranged on the locking column is convenient for the shaping plate to gradually press against the inner arc surface of the arc plate, and the plurality of arc plates are spliced into the steel casing more quickly;
3. when rotatory locking bolt drive stereotype board was removed towards the direction that is close to the base, stereotype board promoted the gasket and oppresses the elastic component compression, when the stereotype board was demolishd to needs, the locking bolt of loosening soon, the deformation power drive gasket of elastic component promoted the stereotype board and shifts up for it is more convenient when dismantling the stereotype board, thereby it is more convenient when dismantling a section of thick bamboo and take out from the stake is downthehole with the steel, improved the efficiency of construction.
Drawings
FIG. 1 is a schematic overall structure diagram of a first embodiment of the present invention;
FIG. 2 is an enlarged partial schematic view of portion A of FIG. 1;
FIG. 3 is a schematic structural diagram of a fastening block, a locking stud, a pressing block, an elastic member, and a gasket according to a first embodiment of the present invention;
fig. 4 is a flowchart illustrating a second embodiment of the present invention.
Reference numerals: 1. an arc-shaped plate; 2. buckling blocks; 3. shaping plates; 4. a rib plate; 5. a base; 6. a locking post; 7. a bevel; 8. caulking grooves; 9. locking the bolt; 10. a propping block; 11. an elastic member; 12. and (7) a gasket.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example one
Referring to fig. 1 and 3, the steel casing for the construction of the bored pile in the complex soil layer disclosed by the invention comprises a plurality of arc-shaped plates 1, wherein the arc-shaped plates 1 are enclosed to form a cylinder shape, in the embodiment, the arc-shaped plates 1 are preferably four and are arranged in a 360-degree quartering manner, two adjacent arc-shaped plates 1 are detachably connected, a combination part of the two adjacent arc-shaped plates 1 is provided with a shaping device for locking and supporting the two arc-shaped plates 1, the shaping device is axially arranged along the arc-shaped plates 1, and in the embodiment, the two arc-shaped plates 1 are preferably arranged and are respectively arranged at two axial ends; the shaping device comprises buckling blocks 2 fixedly connected to the axial side of the inner arc surface of the arc plate 1, two adjacent buckling blocks 2 on two adjacent arc plates 1 are jointly sleeved with shaping plates 3 which are adaptive to the radian of the arc plate 1 and in a crescent shape, two ends of each shaping plate 3 are inserted into gaps between the vertical sections of the buckling blocks 2 and the inner wall of the arc plate 1, and when the shaping plates 3 are abutted against the horizontal sections of the buckling blocks 2, the peripheral sides of the arc surfaces of the shaping plates 3 are attached to the inner arc surface of the arc plate 1; detain piece 2 and include that horizontal welded fastening has base 5 on the arc 1 intrados, and the one end rigid coupling that base 5 kept away from arc 1 has locking post 6, and one side that locking post 6 is close to arc 1 is provided with inclined plane 7, and the distance that locking post 6 is close to base 5's one end apart from arc 1 is less than the distance that locking post 6 kept away from base 5's one end apart from arc 1.
The steel casing is split into the plurality of arc-shaped plates 1, so that the steel casing can be quickly hoisted from the hole when being installed and dismantled, and compared with the hoisting of the integrated steel casing, lubricating oil does not need to be smeared on the outer wall of the steel casing, and the steel casing and the hole are not required to be coaxially and slowly lowered or lifted all the time, so that the construction efficiency is improved, and the construction cost is reduced; when the steel casing is installed, the plurality of arc-shaped plates 1 are difficult to form a complete cylinder shape when being spliced in advance, at the moment, when the two ends of the shaping plate 3 are respectively inserted into gaps between two adjacent arc-shaped plates 1 and two adjacent locking columns 6, the cambered surface side of the shaping plate 3 is difficult to be completely abutted against the inner cambered surface of the arc-shaped plate 1, but the upper end of the shaping plate 3 can be abutted against the upper end of the inclined surface 7 of the locking column 6, so that the locking column 6 can still limit the shaping plate 3, and the shaping plate 3 is convenient to install conveniently; when promoting 3 orientation oppression that are close to base 5 of stereotype, the inclined plane 7 that locking post 6 set up is convenient for stereotype 3 to supporting gradually of 1 intrados of arc plate, and is more swift when assembling into a steel with a plurality of arc plates 1 and protects a section of thick bamboo in order to provide the support for a plurality of arc plates 1, can improve the whole compressive capacity of a plurality of arc plates 1, has ensured constructor's construction safety.
Referring to fig. 2 and 3, two ends of the shaping plate 3 in the length direction are provided with caulking grooves 8 which are in splicing fit with one ends of the locking columns 6 close to the base 5, the caulking grooves 8 are located on the plane side of the shaping plate 3, the base 5 is provided with a locking mechanism which is used for locking the shaping plate 3 on the base 5, the locking mechanism comprises locking bolts 9 which are in threaded connection with the base 5, the head end sleeves of the locking bolts 9 are provided with abutting blocks 10 which are used for abutting against the shaping plate 3, the caulking grooves 8, the abutting blocks 10 and the locking columns 6 are in splicing fit at the same time, the caulking grooves 8 are preferably in a convex shape, the smaller ends of the caulking grooves 8 are in splicing fit with the abutting blocks 10, and the larger portions of the caulking grooves 8 are in splicing fit; the locking bolt 9 is also sleeved with an elastic piece 11 and a gasket 12, and the abutting block 10 is positioned above the gasket 12.
After the caulking grooves 8 are arranged, when the shaping plate 3 is installed, the abutting blocks 10 are firstly shifted to be close to the locking columns 6, at the moment, the shaping plate 3 is sleeved between the locking columns 6 and the arc-shaped plate 1, and the abutting blocks 10 and the locking columns 6 penetrate through the caulking grooves 8 on the shaping plate 3, so that the shaping plate 3 can be positioned, and the shaping plate 3 is prevented from deviating after the arc-shaped plate 1 is pressed; after the shaping plate 3 passes through the abutting block 10, the abutting block 10 is rotated on the locking bolt 9 to enable the abutting block 10 to face one side far away from the caulking groove 8, at the moment, the locking bolt 9 is rotated, the locking bolt 9 pushes the shaping plate 3 to move towards the direction close to the base 5 through the abutting block 10, the shaping plate 3 is far away from the inclined plane 7 of the arc plate 1 on the locking column 6 to slide downwards, the shaping plate 3 pushes the gasket 12 and presses the elastic piece 11 to compress and react with deformation, and finally when the shaping plate 3 is locked on the base 5, the groove wall of the caulking groove 8 on the shaping plate 3 is abutted against the inclined plane 7 of the locking column 6, so that the cambered surface of the shaping plate 3 can be effectively abutted against the inner cambered surface of the arc plate 1 to support the adjacent two spliced arc plates 1, and the overall structural strength of the steel protection cylinder formed by the arc plates 1 is effectively improved; when needs demolish stereotype 3, loosen locking bolt 9 soon, the deformation power drive gasket 12 of elastic component 11 promotes stereotype 3 and shifts up for it is more convenient when dismantling stereotype 3, thereby it is more convenient when dismantling a steel casing and take out in the stake hole, improved the efficiency of construction.
Referring to fig. 1 and 2, stereotype plate 3 forms for aluminum alloy integrated into one piece, and has the lightweight setting, and the thickness that stereotype plate 3 is close to 1 one side of locking arc is greater than the thickness that locking stereotype plate 3 kept away from 1 one side of locking arc, and the equal rigid coupling of 3 up end of stereotype plate and lower terminal surface has a plurality of and locks floor 4 of 3 cambered surface one side laminating of stereotype plate, and locking floor 4 perpendicular to locking stereotypes plate 3.
After the arrangement, the contact area between the shaping plate 3 and the arc-shaped plate 1 is increased, the weight of the shaping plate 3 is less, the supporting effect of the shaping plate 3 on the arc-shaped plate 1 is further improved, and the structural strength of the steel casing formed by enclosing the arc-shaped plates 1 is higher; after 3 cambered surfaces of stereotype side and cambered plate 1's interior cambered surface laminating, floor 4 also supports with the interior cambered surface of cambered plate 1, has increased stereotype 3 supporting effect to cambered plate 1, has improved the anti ability of buckling of axial of cambered plate 1.
The implementation principle of the embodiment is as follows:
when the steel casing is installed in the hole, firstly, the four arc-shaped plates 1 are adjusted and hoisted into the hole, then the four arc-shaped plates 1 are pre-assembled into a cylinder shape, then, two ends of the shaping plate 3 are respectively inserted into gaps between two adjacent arc-shaped plates 1 and two adjacent locking columns 6, so that the abutting block 10 and the locking columns 6 penetrate through the caulking grooves 8 on the shaping plate 3, after the shaping plate 3 passes over the abutting block 10, the abutting block 10 is rotated on the locking bolt 9 to enable the abutting block 10 to face to one side far away from the caulking grooves 8, at the moment, the locking bolt 9 is rotated, the locking bolt 9 pushes the shaping plate 3 to move towards the direction close to the base 5 through the abutting block 10, the shaping plate 3 far away from the arc-shaped plates 1 and slides downwards on the inclined planes 7 on the locking columns 6, the shaping plate 3 pushes the gaskets 12 and presses the elastic pieces 11 to compress and reversely deform, and finally, when the shaping plate 3 is locked on the base 5, the groove wall of the caulking grooves 8 on the shaping plate 3 is tightly abutted, therefore, the cambered surface of the shaping plate 3 can be effectively abutted against the inner cambered surface of the arc plates 1 to support the adjacent two spliced arc plates 1, the overall structural strength of the steel protection cylinder formed by enclosing the arc plates 1 is effectively improved, the construction safety of constructors is ensured, lubricating oil does not need to be coated on the outer wall of the steel protection cylinder for hoisting, the steel protection cylinder does not need to be coaxially and slowly transferred or lifted with a hole all the time, the construction efficiency is improved, and the construction cost is reduced; when needs demolish stereotype 3, loosen locking bolt 9 soon, the deformation power drive gasket 12 of elastic component 11 promotes stereotype 3 and shifts up for it is more convenient when dismantling stereotype 3, thereby it is more convenient when dismantling a steel casing and take out in the stake hole, improved the efficiency of construction.
Example two
Referring to fig. 4, the complex soil layer bored pile construction process disclosed by the invention is based on the steel casing for complex soil layer bored pile construction, and comprises the following steps:
s1, surveying on site, measuring the depth of an underground water level and the depth of a bedrock layer, and marking the designed construction position of a bored pile;
s2, arranging a dewatering well, burying a water filtering well pipe around the pile position, pumping underground water out of the field through a submersible pump, and excavating a recharge ditch or a recharge well on the side of a building or a structure along the foundation of the pile pier, wherein the recharge ditch is preferably arranged in the embodiment, and part of underground water pumped out of the dewatering well pipe is discharged into the recharge ditch so as to prevent the ground from settling due to too fast reduction of the underground water level near the pile position;
s3, excavating a filling layer, namely excavating the filling layer, and sequentially piling brick retaining walls or sinking precast reinforced concrete retaining walls or spraying concrete retaining walls in the excavating process, wherein the precast reinforced concrete retaining walls are preferably sunk in the embodiment;
s4, excavating the complex soft soil layer, judging the composition of the complex soft soil layer according to the data of field survey in combination with geological data and field construction conditions, and selecting a corresponding wall protection method or a corresponding chiseling method;
when the fluidized fly ash layer is arranged below the filling layer, inserting the open caisson retaining wall into the retaining wall of the filling layer to excavate and protect the fly ash layer;
when the lower part of the filling layer is a plastic clay layer, the brick retaining wall is continuously piled at the edge of the hole of the clay layer;
when an obstacle difficult to dig exists below the filling layer, the obstacle with larger volume is broken by static blasting, the obstacle with smaller volume is chiseled by an air pick, and the metallurgical slag with the shape of a pot bottom is cut by a flame gun;
s5, excavating a sludge layer, namely penetrating a plurality of arc-shaped plates 1 through the retaining walls in the steps S2 and S3 and transmitting the arc-shaped plates into the bottom of the hole, inserting the arc-shaped plates 1 into the periphery of the hole and pre-assembling the arc-shaped plates into a cylindrical steel retaining cylinder, and then shaping two adjacent arc-shaped plates 1 through buckling connection of a shaping plate 3 and a buckling block 2 so as to improve the integral pressure resistance of the arc-shaped plates 1, wherein the steel retaining cylinder sinks while excavating after the steel retaining cylinder is assembled;
s6, installing a reinforcement cage, after the hole is excavated to the foundation layer, installing the reinforcement cage in the excavated hole, and correcting the verticality of the reinforcement cage;
s7, pile foundation pouring concrete and the steel casing are disassembled, concrete is poured into the hole, the shaping plates 3 are disassembled at the same time, the arc plates 1 are gradually drawn out along with continuous pouring of the concrete surface, the concrete surface is always kept higher than the lower end face of the arc plate 1 by 1.5-2 m until the concrete surface is contacted with the upper side wall of the steel casing, the arc plates 1 are completely taken out, and then pile foundation pouring concrete is completed.
When a hole of a hole digging pile is dug in a complex soil layer, a corresponding retaining wall supporting structure is determined according to different flowing plastic states of the soil layer, when the sludge layer is dug, the excavation of the sludge layer is supported through a steel retaining cylinder formed by splicing a plurality of arc plates 1, when the steel retaining cylinder is installed, the plurality of arc plates 1 are only required to be hung in the hole, the construction is convenient and efficient, then the arc plates 1 are shaped into a complete steel retaining cylinder through the clamping connection of the shaping plates 3 and the buckling blocks 2, the axial bending resistance of the whole steel retaining cylinder is improved, when the steel retaining cylinder is dismantled after the hole is completed, the clamping connection of the shaping plates 3 and the buckling blocks 2 is firstly removed, then the arc plates 1 are hung out, the dismantling efficiency is higher, the whole construction period of the hole excavation is shortened, the construction efficiency is high, and the cost is low.
When the soil layer around the pile foundation is subjected to precipitation treatment, the underground water around the hole pile pier is pumped out by the water filtering well pipe, the underground water level at the position is sharply reduced, the ground is easily subjected to uneven settlement, the adjacent buildings and structures are subjected to uneven stress, and potential safety hazards are caused.
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 (7)
1. The utility model provides a complicated soil layer is steel for bored pile construction and is protected a section of thick bamboo which characterized in that: comprises a plurality of arc-shaped plates (1), a plurality of arc-shaped plates (1) are enclosed to form a steel protective cylinder, two adjacent arc-shaped plates (1) are detachably connected, a combining part of two adjacent arc-shaped plates (1) is provided with a shaping device for locking and supporting the two arc-shaped plates (1), the shaping device comprises buckling blocks (2) fixedly connected with the inner arc surface of the arc plate (1) at the axial side, two adjacent buckling blocks (2) on the arc plate (1) are jointly sleeved with shaping plates (3) which are matched with the radian of the arc plate (1) and are in a crescent shape, the two ends of the shaping plate (3) are inserted into a gap between the vertical section of the buckling block (2) and the inner wall of the arc-shaped plate (1), when the shaping plate (3) is abutted against the horizontal section of the buckling block (2), the peripheral side of the cambered surface of the shaping plate (3) is attached to the inner cambered surface of the cambered plate (1);
the buckling block (2) comprises a base (5) which is horizontally welded and fixed on the inner arc surface of the arc-shaped plate (1), and one end, far away from the arc-shaped plate (1), of the base (5) is fixedly connected with a locking column (6);
the two ends of the shaping plate (3) in the length direction are provided with caulking grooves (8) which are in inserted fit with one ends, close to the base (5), of the locking columns (6), and the caulking grooves (8) are located on the plane side of the shaping plate (3);
be provided with on base (5) and be used for locking stereotype plate (3) in locking mechanism on base (5), locking mechanism includes threaded connection locking bolt (9) on base (5), the head pot head of locking bolt (9) is equipped with and is used for supporting tightly stereotype plate (3) support tight piece (10), caulking groove (8) with support tight piece (10) with locking post (6) are the adaptation of pegging graft simultaneously.
2. The steel pile casing for the construction of the dug pile in the complex soil layer as claimed in claim 1, wherein: the equal rigid coupling of stereotype (3) up end and lower terminal surface have a plurality ofly with floor (4) of stereotype (3) cambered surface one side laminating, floor (4) perpendicular to stereotype (3).
3. The steel pile casing for the construction of the dug pile in the complex soil layer as claimed in claim 2, wherein: one side that locking post (6) are close to arc (1) is provided with inclined plane (7), locking post (6) are close to the one end of base (5) is apart from the distance of arc (1) is less than locking post (6) are kept away from the one end of base (5) is apart from the distance of arc (1).
4. The steel pile casing for the construction of the dug pile in the complex soil layer as claimed in claim 1, wherein: an elastic piece (11) and a gasket (12) are further sleeved on the locking bolt (9), and the abutting block (10) is located above the gasket (12).
5. The steel pile casing for the construction of the dug pile in the complex soil layer as claimed in claim 1, wherein: the shaping plate (3) is close to the thickness of one side of the arc plate (1) is larger than the shaping plate (3) is far away from the thickness of one side of the arc plate (1).
6. A complex soil layer bored pile construction process based on the steel casing for complex soil layer bored pile construction according to any one of claims 1 to 5, comprising the steps of:
s1, surveying on site, measuring the depth of an underground water level and the depth of a bedrock layer, and marking the designed construction position of a bored pile;
s2, arranging a dewatering well, burying a water filtering well pipe around the pile position, and pumping underground water by a submersible pump;
s3, excavating a filling layer, namely excavating the filling layer, and sequentially piling brick retaining walls or sinking precast reinforced concrete retaining walls or spraying concrete retaining walls in the excavating process;
s4, excavating a complex soft soil layer, combining geological data according to data of field survey, and inserting an open caisson retaining wall into a retaining wall of a filling soil layer when a fluidized and plastic fly ash layer is arranged below the filling soil layer to excavate and protect the fly ash layer;
when the lower part of the filling layer is a plastic clay layer, the brick retaining wall is continuously piled at the edge of the hole of the clay layer;
when an obstacle difficult to dig exists below the filling layer, static blasting is adopted for breaking or a pneumatic pick is adopted for chiseling;
s5, excavating a sludge layer, namely penetrating a plurality of arc-shaped plates (1) through the retaining walls in the steps S2 and S3 and introducing the arc-shaped plates into the bottom of the hole, inserting the arc-shaped plates (1) into the periphery of the hole and assembling the arc-shaped plates into a cylindrical steel retaining cylinder, and then shaping the arc-shaped plates (1) through buckling connection of the shaping plates (3) and the buckling blocks (2) so as to improve the overall pressure resistance of the arc-shaped plates (1), wherein the steel retaining cylinder sinks while excavating after the steel retaining cylinder is assembled;
s6, installing a reinforcement cage, after the hole is excavated to the foundation layer, installing the reinforcement cage in the excavated hole, and correcting the verticality of the reinforcement cage;
s7, pile foundation pouring concrete and steel casing demolish, to the hole in concreting, and demolish a plurality ofly simultaneously stereotype board (3), along with the continuous pouring of concrete face, take a plurality ofly gradually arc (1) keeps the concrete face to be higher than all the time arc (1) terminal surface 1.5 ~ 2m down, until concrete face and steel casing top dado contact, will be a plurality of arc (1) takes out completely.
7. The complex soil layer bored pile construction process according to claim 6, characterized in that: in step S2, when pumping groundwater from the drainage well, a recharge trench or a recharge well is excavated along the foundation of the pile pier of the hole in the building or structure, so as to prevent the ground from settling due to too fast drop of the groundwater level near the pile position.
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| CN112177555B (en) * | 2020-10-22 | 2024-06-11 | 中国能源建设集团陕西省电力设计院有限公司 | Detachable wellhead reinforcing and protecting device |
| WO2023218396A1 (en) * | 2022-05-12 | 2023-11-16 | Viking Rental Corporation Oü | Method of installation of a drill pile and the drill pill |
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| JP2980140B2 (en) * | 1992-07-28 | 1999-11-22 | 三菱重工業株式会社 | Casing tube |
| US7017666B1 (en) * | 1999-09-16 | 2006-03-28 | Shell Oil Company | Smooth sleeves for drag and VIV reduction of cylindrical structures |
| CN101634146B (en) * | 2008-07-24 | 2011-01-26 | 邢利奥 | Manually digging hole full-steel cylinder-wall protecting construction device for building pile foundation and construction method thereof |
| CN203495494U (en) * | 2013-09-24 | 2014-03-26 | 安徽方圆压力容器制造有限责任公司 | Cylindrical body assembly tool |
| CN204370415U (en) * | 2014-10-23 | 2015-06-03 | 中国二十冶集团有限公司 | Artificial rock drilling protection combination steel pile casting at the bottom of hole |
| CN106703028B (en) * | 2016-11-22 | 2019-07-12 | 重庆建工第九建设有限公司 | Large-diameter Manual Excavation Pile precast splice type steel retaining wall and its construction technology |
| CN210002396U (en) * | 2019-03-29 | 2020-01-31 | 河南省华兴网络科技有限公司 | modularized pile foundation dado |
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